| ... | ... | @@ -24,6 +24,7 @@ const trace = @import("../tracy.zig").trace; |
| 24 | 24 | const Air = @import("../Air.zig"); |
| 25 | 25 | const Allocator = mem.Allocator; |
| 26 | 26 | const Archive = @import("MachO/Archive.zig"); |
| 27 | const Atom = @import("MachO/Atom.zig"); |
| 27 | 28 | const Cache = @import("../Cache.zig"); |
| 28 | 29 | const CodeSignature = @import("MachO/CodeSignature.zig"); |
| 29 | 30 | const Compilation = @import("../Compilation.zig"); |
| ... | ... | @@ -39,9 +40,10 @@ const Module = @import("../Module.zig"); |
| 39 | 40 | const SegmentCommand = commands.SegmentCommand; |
| 40 | 41 | const StringIndexAdapter = std.hash_map.StringIndexAdapter; |
| 41 | 42 | const StringIndexContext = std.hash_map.StringIndexContext; |
| 42 | | pub const TextBlock = @import("MachO/TextBlock.zig"); |
| 43 | 43 | const Trie = @import("MachO/Trie.zig"); |
| 44 | 44 | |
| 45 | pub const TextBlock = Atom; |
| 46 | |
| 45 | 47 | pub const base_tag: File.Tag = File.Tag.macho; |
| 46 | 48 | |
| 47 | 49 | base: File, |
| ... | ... | @@ -95,9 +97,6 @@ source_version_cmd_index: ?u16 = null, |
| 95 | 97 | build_version_cmd_index: ?u16 = null, |
| 96 | 98 | uuid_cmd_index: ?u16 = null, |
| 97 | 99 | code_signature_cmd_index: ?u16 = null, |
| 98 | | /// Path to libSystem |
| 99 | | /// TODO this is obsolete, remove it. |
| 100 | | libsystem_cmd_index: ?u16 = null, |
| 101 | 100 | |
| 102 | 101 | // __TEXT segment sections |
| 103 | 102 | text_section_index: ?u16 = null, |
| ... | ... | @@ -132,65 +131,59 @@ tlv_bss_section_index: ?u16 = null, |
| 132 | 131 | la_symbol_ptr_section_index: ?u16 = null, |
| 133 | 132 | data_section_index: ?u16 = null, |
| 134 | 133 | bss_section_index: ?u16 = null, |
| 135 | | common_section_index: ?u16 = null, |
| 136 | 134 | |
| 137 | 135 | objc_const_section_index: ?u16 = null, |
| 138 | 136 | objc_selrefs_section_index: ?u16 = null, |
| 139 | 137 | objc_classrefs_section_index: ?u16 = null, |
| 140 | 138 | objc_data_section_index: ?u16 = null, |
| 141 | 139 | |
| 140 | bss_file_offset: u32 = 0, |
| 141 | tlv_bss_file_offset: u32 = 0, |
| 142 | |
| 142 | 143 | locals: std.ArrayListUnmanaged(macho.nlist_64) = .{}, |
| 143 | 144 | globals: std.ArrayListUnmanaged(macho.nlist_64) = .{}, |
| 144 | 145 | undefs: std.ArrayListUnmanaged(macho.nlist_64) = .{}, |
| 145 | 146 | symbol_resolver: std.AutoHashMapUnmanaged(u32, SymbolWithLoc) = .{}, |
| 147 | unresolved: std.AutoArrayHashMapUnmanaged(u32, enum { |
| 148 | none, |
| 149 | stub, |
| 150 | got, |
| 151 | }) = .{}, |
| 152 | tentatives: std.AutoArrayHashMapUnmanaged(u32, void) = .{}, |
| 146 | 153 | |
| 147 | 154 | locals_free_list: std.ArrayListUnmanaged(u32) = .{}, |
| 148 | 155 | globals_free_list: std.ArrayListUnmanaged(u32) = .{}, |
| 149 | 156 | |
| 150 | | stub_helper_stubs_start_off: ?u64 = null, |
| 157 | dyld_stub_binder_index: ?u32 = null, |
| 158 | dyld_private_atom: ?*Atom = null, |
| 159 | stub_helper_preamble_atom: ?*Atom = null, |
| 151 | 160 | |
| 152 | 161 | strtab: std.ArrayListUnmanaged(u8) = .{}, |
| 153 | 162 | strtab_dir: std.HashMapUnmanaged(u32, void, StringIndexContext, std.hash_map.default_max_load_percentage) = .{}, |
| 154 | 163 | |
| 155 | | got_entries: std.ArrayListUnmanaged(GotIndirectionKey) = .{}, |
| 156 | | got_entries_map: std.AutoHashMapUnmanaged(GotIndirectionKey, u32) = .{}, |
| 157 | | |
| 158 | | got_entries_free_list: std.ArrayListUnmanaged(u32) = .{}, |
| 159 | | |
| 160 | | stubs: std.ArrayListUnmanaged(u32) = .{}, |
| 161 | | stubs_map: std.AutoHashMapUnmanaged(u32, u32) = .{}, |
| 164 | got_entries_map: std.AutoArrayHashMapUnmanaged(GotIndirectionKey, *Atom) = .{}, |
| 165 | stubs_map: std.AutoArrayHashMapUnmanaged(u32, *Atom) = .{}, |
| 162 | 166 | |
| 163 | 167 | error_flags: File.ErrorFlags = File.ErrorFlags{}, |
| 164 | 168 | |
| 165 | | got_entries_count_dirty: bool = false, |
| 166 | 169 | load_commands_dirty: bool = false, |
| 167 | | rebase_info_dirty: bool = false, |
| 168 | | binding_info_dirty: bool = false, |
| 169 | | lazy_binding_info_dirty: bool = false, |
| 170 | | export_info_dirty: bool = false, |
| 171 | | |
| 172 | | strtab_dirty: bool = false, |
| 173 | | strtab_needs_relocation: bool = false, |
| 174 | | |
| 170 | sections_order_dirty: bool = false, |
| 175 | 171 | has_dices: bool = false, |
| 176 | 172 | has_stabs: bool = false, |
| 173 | /// A helper var to indicate if we are at the start of the incremental updates, or |
| 174 | /// already somewhere further along the update-and-run chain. |
| 175 | /// TODO once we add opening a prelinked output binary from file, this will become |
| 176 | /// obsolete as we will carry on where we left off. |
| 177 | cold_start: bool = false, |
| 177 | 178 | |
| 178 | 179 | section_ordinals: std.AutoArrayHashMapUnmanaged(MatchingSection, void) = .{}, |
| 179 | 180 | |
| 180 | | pending_updates: std.ArrayListUnmanaged(struct { |
| 181 | | kind: enum { |
| 182 | | got, |
| 183 | | stub, |
| 184 | | }, |
| 185 | | index: u32, |
| 186 | | }) = .{}, |
| 187 | | |
| 188 | | /// A list of text blocks that have surplus capacity. This list can have false |
| 181 | /// A list of atoms that have surplus capacity. This list can have false |
| 189 | 182 | /// positives, as functions grow and shrink over time, only sometimes being added |
| 190 | 183 | /// or removed from the freelist. |
| 191 | 184 | /// |
| 192 | | /// A text block has surplus capacity when its overcapacity value is greater than |
| 193 | | /// padToIdeal(minimum_text_block_size). That is, when it has so |
| 185 | /// An atom has surplus capacity when its overcapacity value is greater than |
| 186 | /// padToIdeal(minimum_atom_size). That is, when it has so |
| 194 | 187 | /// much extra capacity, that we could fit a small new symbol in it, itself with |
| 195 | 188 | /// ideal_capacity or more. |
| 196 | 189 | /// |
| ... | ... | @@ -198,25 +191,23 @@ pending_updates: std.ArrayListUnmanaged(struct { |
| 198 | 191 | /// |
| 199 | 192 | /// Overcapacity is measured by actual_capacity - ideal_capacity. Note that |
| 200 | 193 | /// overcapacity can be negative. A simple way to have negative overcapacity is to |
| 201 | | /// allocate a fresh text block, which will have ideal capacity, and then grow it |
| 194 | /// allocate a fresh atom, which will have ideal capacity, and then grow it |
| 202 | 195 | /// by 1 byte. It will then have -1 overcapacity. |
| 203 | | text_block_free_list: std.ArrayListUnmanaged(*TextBlock) = .{}, |
| 196 | atom_free_lists: std.AutoHashMapUnmanaged(MatchingSection, std.ArrayListUnmanaged(*Atom)) = .{}, |
| 204 | 197 | |
| 205 | | /// Pointer to the last allocated text block |
| 206 | | last_text_block: ?*TextBlock = null, |
| 198 | /// Pointer to the last allocated atom |
| 199 | atoms: std.AutoHashMapUnmanaged(MatchingSection, *Atom) = .{}, |
| 207 | 200 | |
| 208 | | /// List of TextBlocks that are owned directly by the linker. |
| 209 | | /// Currently these are only TextBlocks that are the result of linking |
| 210 | | /// object files. TextBlock which take part in incremental linking are |
| 201 | /// List of atoms that are owned directly by the linker. |
| 202 | /// Currently these are only atoms that are the result of linking |
| 203 | /// object files. Atoms which take part in incremental linking are |
| 211 | 204 | /// at present owned by Module.Decl. |
| 212 | 205 | /// TODO consolidate this. |
| 213 | | managed_blocks: std.ArrayListUnmanaged(*TextBlock) = .{}, |
| 214 | | |
| 215 | | blocks: std.AutoHashMapUnmanaged(MatchingSection, *TextBlock) = .{}, |
| 206 | managed_atoms: std.ArrayListUnmanaged(*Atom) = .{}, |
| 216 | 207 | |
| 217 | 208 | /// Table of Decls that are currently alive. |
| 218 | 209 | /// We store them here so that we can properly dispose of any allocated |
| 219 | | /// memory within the TextBlock in the incremental linker. |
| 210 | /// memory within the atom in the incremental linker. |
| 220 | 211 | /// TODO consolidate this. |
| 221 | 212 | decls: std.AutoArrayHashMapUnmanaged(*Module.Decl, void) = .{}, |
| 222 | 213 | |
| ... | ... | @@ -226,6 +217,12 @@ decls: std.AutoArrayHashMapUnmanaged(*Module.Decl, void) = .{}, |
| 226 | 217 | /// somewhere else in the codegen. |
| 227 | 218 | active_decl: ?*Module.Decl = null, |
| 228 | 219 | |
| 220 | const PendingUpdate = union(enum) { |
| 221 | resolve_undef: u32, |
| 222 | add_stub_entry: u32, |
| 223 | add_got_entry: u32, |
| 224 | }; |
| 225 | |
| 229 | 226 | const SymbolWithLoc = struct { |
| 230 | 227 | // Table where the symbol can be found. |
| 231 | 228 | where: enum { |
| ... | ... | @@ -247,21 +244,10 @@ pub const GotIndirectionKey = struct { |
| 247 | 244 | |
| 248 | 245 | /// When allocating, the ideal_capacity is calculated by |
| 249 | 246 | /// actual_capacity + (actual_capacity / ideal_factor) |
| 250 | | const ideal_factor = 2; |
| 247 | const ideal_factor = 4; |
| 251 | 248 | |
| 252 | 249 | /// Default path to dyld |
| 253 | | /// TODO instead of hardcoding it, we should probably look through some env vars and search paths |
| 254 | | /// instead but this will do for now. |
| 255 | | const DEFAULT_DYLD_PATH: [*:0]const u8 = "/usr/lib/dyld"; |
| 256 | | |
| 257 | | /// Default lib search path |
| 258 | | /// TODO instead of hardcoding it, we should probably look through some env vars and search paths |
| 259 | | /// instead but this will do for now. |
| 260 | | const DEFAULT_LIB_SEARCH_PATH: []const u8 = "/usr/lib"; |
| 261 | | |
| 262 | | const LIB_SYSTEM_NAME: [*:0]const u8 = "System"; |
| 263 | | /// TODO we should search for libSystem and fail if it doesn't exist, instead of hardcoding it |
| 264 | | const LIB_SYSTEM_PATH: [*:0]const u8 = DEFAULT_LIB_SEARCH_PATH ++ "/libSystem.B.dylib"; |
| 250 | const default_dyld_path: [*:0]const u8 = "/usr/lib/dyld"; |
| 265 | 251 | |
| 266 | 252 | /// In order for a slice of bytes to be considered eligible to keep metadata pointing at |
| 267 | 253 | /// it as a possible place to put new symbols, it must have enough room for this many bytes |
| ... | ... | @@ -269,6 +255,10 @@ const LIB_SYSTEM_PATH: [*:0]const u8 = DEFAULT_LIB_SEARCH_PATH ++ "/libSystem.B. |
| 269 | 255 | const minimum_text_block_size = 64; |
| 270 | 256 | pub const min_text_capacity = padToIdeal(minimum_text_block_size); |
| 271 | 257 | |
| 258 | /// Virtual memory offset corresponds to the size of __PAGEZERO segment and start of |
| 259 | /// __TEXT segment. |
| 260 | const pagezero_vmsize: u64 = 0x100000000; |
| 261 | |
| 272 | 262 | pub const Export = struct { |
| 273 | 263 | sym_index: ?u32 = null, |
| 274 | 264 | }; |
| ... | ... | @@ -323,31 +313,32 @@ pub fn openPath(allocator: *Allocator, sub_path: []const u8, options: link.Optio |
| 323 | 313 | return self; |
| 324 | 314 | } |
| 325 | 315 | |
| 326 | | if (!options.strip and options.module != null) { |
| 327 | | // Create dSYM bundle. |
| 328 | | const dir = options.module.?.zig_cache_artifact_directory; |
| 329 | | log.debug("creating {s}.dSYM bundle in {s}", .{ sub_path, dir.path }); |
| 316 | // TODO Migrate DebugSymbols to the merged linker codepaths |
| 317 | // if (!options.strip and options.module != null) { |
| 318 | // // Create dSYM bundle. |
| 319 | // const dir = options.module.?.zig_cache_artifact_directory; |
| 320 | // log.debug("creating {s}.dSYM bundle in {s}", .{ sub_path, dir.path }); |
| 330 | 321 | |
| 331 | | const d_sym_path = try fmt.allocPrint( |
| 332 | | allocator, |
| 333 | | "{s}.dSYM" ++ fs.path.sep_str ++ "Contents" ++ fs.path.sep_str ++ "Resources" ++ fs.path.sep_str ++ "DWARF", |
| 334 | | .{sub_path}, |
| 335 | | ); |
| 336 | | defer allocator.free(d_sym_path); |
| 322 | // const d_sym_path = try fmt.allocPrint( |
| 323 | // allocator, |
| 324 | // "{s}.dSYM" ++ fs.path.sep_str ++ "Contents" ++ fs.path.sep_str ++ "Resources" ++ fs.path.sep_str ++ "DWARF", |
| 325 | // .{sub_path}, |
| 326 | // ); |
| 327 | // defer allocator.free(d_sym_path); |
| 337 | 328 | |
| 338 | | var d_sym_bundle = try dir.handle.makeOpenPath(d_sym_path, .{}); |
| 339 | | defer d_sym_bundle.close(); |
| 329 | // var d_sym_bundle = try dir.handle.makeOpenPath(d_sym_path, .{}); |
| 330 | // defer d_sym_bundle.close(); |
| 340 | 331 | |
| 341 | | const d_sym_file = try d_sym_bundle.createFile(sub_path, .{ |
| 342 | | .truncate = false, |
| 343 | | .read = true, |
| 344 | | }); |
| 332 | // const d_sym_file = try d_sym_bundle.createFile(sub_path, .{ |
| 333 | // .truncate = false, |
| 334 | // .read = true, |
| 335 | // }); |
| 345 | 336 | |
| 346 | | self.d_sym = .{ |
| 347 | | .base = self, |
| 348 | | .file = d_sym_file, |
| 349 | | }; |
| 350 | | } |
| 337 | // self.d_sym = .{ |
| 338 | // .base = self, |
| 339 | // .file = d_sym_file, |
| 340 | // }; |
| 341 | // } |
| 351 | 342 | |
| 352 | 343 | // Index 0 is always a null symbol. |
| 353 | 344 | try self.locals.append(allocator, .{ |
| ... | ... | @@ -357,13 +348,12 @@ pub fn openPath(allocator: *Allocator, sub_path: []const u8, options: link.Optio |
| 357 | 348 | .n_desc = 0, |
| 358 | 349 | .n_value = 0, |
| 359 | 350 | }); |
| 351 | try self.strtab.append(allocator, 0); |
| 360 | 352 | |
| 361 | 353 | try self.populateMissingMetadata(); |
| 362 | | try self.writeLocalSymbol(0); |
| 363 | 354 | |
| 364 | 355 | if (self.d_sym) |*ds| { |
| 365 | 356 | try ds.populateMissingMetadata(allocator); |
| 366 | | try ds.writeLocalSymbol(0); |
| 367 | 357 | } |
| 368 | 358 | |
| 369 | 359 | return self; |
| ... | ... | @@ -403,179 +393,6 @@ pub fn flush(self: *MachO, comp: *Compilation) !void { |
| 403 | 393 | } |
| 404 | 394 | } |
| 405 | 395 | |
| 406 | | const use_stage1 = build_options.is_stage1 and self.base.options.use_stage1; |
| 407 | | if (use_stage1) { |
| 408 | | return self.linkWithZld(comp); |
| 409 | | } else { |
| 410 | | switch (self.base.options.effectiveOutputMode()) { |
| 411 | | .Exe, .Obj => {}, |
| 412 | | .Lib => return error.TODOImplementWritingLibFiles, |
| 413 | | } |
| 414 | | return self.flushModule(comp); |
| 415 | | } |
| 416 | | } |
| 417 | | |
| 418 | | pub fn flushModule(self: *MachO, comp: *Compilation) !void { |
| 419 | | _ = comp; |
| 420 | | const tracy = trace(@src()); |
| 421 | | defer tracy.end(); |
| 422 | | |
| 423 | | const output_mode = self.base.options.output_mode; |
| 424 | | |
| 425 | | switch (output_mode) { |
| 426 | | .Exe => { |
| 427 | | if (self.entry_addr) |addr| { |
| 428 | | // Update LC_MAIN with entry offset. |
| 429 | | const text_segment = self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 430 | | const main_cmd = &self.load_commands.items[self.main_cmd_index.?].Main; |
| 431 | | main_cmd.entryoff = addr - text_segment.inner.vmaddr; |
| 432 | | main_cmd.stacksize = self.base.options.stack_size_override orelse 0; |
| 433 | | self.load_commands_dirty = true; |
| 434 | | } |
| 435 | | try self.writeRebaseInfoTable(); |
| 436 | | try self.writeBindInfoTable(); |
| 437 | | try self.writeLazyBindInfoTable(); |
| 438 | | try self.writeExportInfo(); |
| 439 | | try self.writeAllGlobalAndUndefSymbols(); |
| 440 | | try self.writeIndirectSymbolTable(); |
| 441 | | try self.writeStringTable(); |
| 442 | | try self.updateLinkeditSegmentSizes(); |
| 443 | | |
| 444 | | if (self.d_sym) |*ds| { |
| 445 | | // Flush debug symbols bundle. |
| 446 | | try ds.flushModule(self.base.allocator, self.base.options); |
| 447 | | } |
| 448 | | |
| 449 | | if (self.requires_adhoc_codesig) { |
| 450 | | // Preallocate space for the code signature. |
| 451 | | // We need to do this at this stage so that we have the load commands with proper values |
| 452 | | // written out to the file. |
| 453 | | // The most important here is to have the correct vm and filesize of the __LINKEDIT segment |
| 454 | | // where the code signature goes into. |
| 455 | | try self.writeCodeSignaturePadding(); |
| 456 | | } |
| 457 | | }, |
| 458 | | .Obj => {}, |
| 459 | | .Lib => return error.TODOImplementWritingLibFiles, |
| 460 | | } |
| 461 | | |
| 462 | | try self.writeLoadCommands(); |
| 463 | | try self.writeHeader(); |
| 464 | | |
| 465 | | if (self.entry_addr == null and self.base.options.output_mode == .Exe) { |
| 466 | | log.debug("flushing. no_entry_point_found = true", .{}); |
| 467 | | self.error_flags.no_entry_point_found = true; |
| 468 | | } else { |
| 469 | | log.debug("flushing. no_entry_point_found = false", .{}); |
| 470 | | self.error_flags.no_entry_point_found = false; |
| 471 | | } |
| 472 | | |
| 473 | | assert(!self.got_entries_count_dirty); |
| 474 | | assert(!self.load_commands_dirty); |
| 475 | | assert(!self.rebase_info_dirty); |
| 476 | | assert(!self.binding_info_dirty); |
| 477 | | assert(!self.lazy_binding_info_dirty); |
| 478 | | assert(!self.export_info_dirty); |
| 479 | | assert(!self.strtab_dirty); |
| 480 | | assert(!self.strtab_needs_relocation); |
| 481 | | |
| 482 | | if (self.requires_adhoc_codesig) { |
| 483 | | try self.writeCodeSignature(); // code signing always comes last |
| 484 | | } |
| 485 | | } |
| 486 | | |
| 487 | | fn resolveSearchDir( |
| 488 | | arena: *Allocator, |
| 489 | | dir: []const u8, |
| 490 | | syslibroot: ?[]const u8, |
| 491 | | ) !?[]const u8 { |
| 492 | | var candidates = std.ArrayList([]const u8).init(arena); |
| 493 | | |
| 494 | | if (fs.path.isAbsolute(dir)) { |
| 495 | | if (syslibroot) |root| { |
| 496 | | const common_dir = if (std.Target.current.os.tag == .windows) blk: { |
| 497 | | // We need to check for disk designator and strip it out from dir path so |
| 498 | | // that we can concat dir with syslibroot. |
| 499 | | // TODO we should backport this mechanism to 'MachO.Dylib.parseDependentLibs()' |
| 500 | | const disk_designator = fs.path.diskDesignatorWindows(dir); |
| 501 | | |
| 502 | | if (mem.indexOf(u8, dir, disk_designator)) |where| { |
| 503 | | break :blk dir[where + disk_designator.len ..]; |
| 504 | | } |
| 505 | | |
| 506 | | break :blk dir; |
| 507 | | } else dir; |
| 508 | | const full_path = try fs.path.join(arena, &[_][]const u8{ root, common_dir }); |
| 509 | | try candidates.append(full_path); |
| 510 | | } |
| 511 | | } |
| 512 | | |
| 513 | | try candidates.append(dir); |
| 514 | | |
| 515 | | for (candidates.items) |candidate| { |
| 516 | | // Verify that search path actually exists |
| 517 | | var tmp = fs.cwd().openDir(candidate, .{}) catch |err| switch (err) { |
| 518 | | error.FileNotFound => continue, |
| 519 | | else => |e| return e, |
| 520 | | }; |
| 521 | | defer tmp.close(); |
| 522 | | |
| 523 | | return candidate; |
| 524 | | } |
| 525 | | |
| 526 | | return null; |
| 527 | | } |
| 528 | | |
| 529 | | fn resolveLib( |
| 530 | | arena: *Allocator, |
| 531 | | search_dirs: []const []const u8, |
| 532 | | name: []const u8, |
| 533 | | ext: []const u8, |
| 534 | | ) !?[]const u8 { |
| 535 | | const search_name = try std.fmt.allocPrint(arena, "lib{s}{s}", .{ name, ext }); |
| 536 | | |
| 537 | | for (search_dirs) |dir| { |
| 538 | | const full_path = try fs.path.join(arena, &[_][]const u8{ dir, search_name }); |
| 539 | | |
| 540 | | // Check if the file exists. |
| 541 | | const tmp = fs.cwd().openFile(full_path, .{}) catch |err| switch (err) { |
| 542 | | error.FileNotFound => continue, |
| 543 | | else => |e| return e, |
| 544 | | }; |
| 545 | | defer tmp.close(); |
| 546 | | |
| 547 | | return full_path; |
| 548 | | } |
| 549 | | |
| 550 | | return null; |
| 551 | | } |
| 552 | | |
| 553 | | fn resolveFramework( |
| 554 | | arena: *Allocator, |
| 555 | | search_dirs: []const []const u8, |
| 556 | | name: []const u8, |
| 557 | | ext: []const u8, |
| 558 | | ) !?[]const u8 { |
| 559 | | const search_name = try std.fmt.allocPrint(arena, "{s}{s}", .{ name, ext }); |
| 560 | | const prefix_path = try std.fmt.allocPrint(arena, "{s}.framework", .{name}); |
| 561 | | |
| 562 | | for (search_dirs) |dir| { |
| 563 | | const full_path = try fs.path.join(arena, &[_][]const u8{ dir, prefix_path, search_name }); |
| 564 | | |
| 565 | | // Check if the file exists. |
| 566 | | const tmp = fs.cwd().openFile(full_path, .{}) catch |err| switch (err) { |
| 567 | | error.FileNotFound => continue, |
| 568 | | else => |e| return e, |
| 569 | | }; |
| 570 | | defer tmp.close(); |
| 571 | | |
| 572 | | return full_path; |
| 573 | | } |
| 574 | | |
| 575 | | return null; |
| 576 | | } |
| 577 | | |
| 578 | | fn linkWithZld(self: *MachO, comp: *Compilation) !void { |
| 579 | 396 | const tracy = trace(@src()); |
| 580 | 397 | defer tracy.end(); |
| 581 | 398 | |
| ... | ... | @@ -584,11 +401,11 @@ fn linkWithZld(self: *MachO, comp: *Compilation) !void { |
| 584 | 401 | const arena = &arena_allocator.allocator; |
| 585 | 402 | |
| 586 | 403 | const directory = self.base.options.emit.?.directory; // Just an alias to make it shorter to type. |
| 404 | const use_stage1 = build_options.is_stage1 and self.base.options.use_stage1; |
| 587 | 405 | |
| 588 | 406 | // If there is no Zig code to compile, then we should skip flushing the output file because it |
| 589 | 407 | // will not be part of the linker line anyway. |
| 590 | 408 | const module_obj_path: ?[]const u8 = if (self.base.options.module) |module| blk: { |
| 591 | | const use_stage1 = build_options.is_stage1 and self.base.options.use_stage1; |
| 592 | 409 | if (use_stage1) { |
| 593 | 410 | const obj_basename = try std.zig.binNameAlloc(arena, .{ |
| 594 | 411 | .root_name = self.base.options.root_name, |
| ... | ... | @@ -600,8 +417,8 @@ fn linkWithZld(self: *MachO, comp: *Compilation) !void { |
| 600 | 417 | break :blk full_obj_path; |
| 601 | 418 | } |
| 602 | 419 | |
| 420 | const obj_basename = self.base.intermediary_basename orelse break :blk null; |
| 603 | 421 | try self.flushModule(comp); |
| 604 | | const obj_basename = self.base.intermediary_basename.?; |
| 605 | 422 | const full_obj_path = try directory.join(arena, &[_][]const u8{obj_basename}); |
| 606 | 423 | break :blk full_obj_path; |
| 607 | 424 | } else null; |
| ... | ... | @@ -617,8 +434,11 @@ fn linkWithZld(self: *MachO, comp: *Compilation) !void { |
| 617 | 434 | defer if (!self.base.options.disable_lld_caching) man.deinit(); |
| 618 | 435 | |
| 619 | 436 | var digest: [Cache.hex_digest_len]u8 = undefined; |
| 437 | var needs_full_relink = true; |
| 438 | |
| 439 | cache: { |
| 440 | if (use_stage1 and self.base.options.disable_lld_caching) break :cache; |
| 620 | 441 | |
| 621 | | if (!self.base.options.disable_lld_caching) { |
| 622 | 442 | man = comp.cache_parent.obtain(); |
| 623 | 443 | |
| 624 | 444 | // We are about to obtain this lock, so here we give other processes a chance first. |
| ... | ... | @@ -652,17 +472,36 @@ fn linkWithZld(self: *MachO, comp: *Compilation) !void { |
| 652 | 472 | id_symlink_basename, |
| 653 | 473 | &prev_digest_buf, |
| 654 | 474 | ) catch |err| blk: { |
| 655 | | log.debug("MachO Zld new_digest={s} error: {s}", .{ std.fmt.fmtSliceHexLower(&digest), @errorName(err) }); |
| 475 | log.debug("MachO Zld new_digest={s} error: {s}", .{ |
| 476 | std.fmt.fmtSliceHexLower(&digest), |
| 477 | @errorName(err), |
| 478 | }); |
| 656 | 479 | // Handle this as a cache miss. |
| 657 | 480 | break :blk prev_digest_buf[0..0]; |
| 658 | 481 | }; |
| 659 | 482 | if (mem.eql(u8, prev_digest, &digest)) { |
| 660 | | log.debug("MachO Zld digest={s} match - skipping invocation", .{std.fmt.fmtSliceHexLower(&digest)}); |
| 661 | 483 | // Hot diggity dog! The output binary is already there. |
| 662 | | self.base.lock = man.toOwnedLock(); |
| 663 | | return; |
| 484 | |
| 485 | if (use_stage1) { |
| 486 | log.debug("MachO Zld digest={s} match - skipping invocation", .{std.fmt.fmtSliceHexLower(&digest)}); |
| 487 | self.base.lock = man.toOwnedLock(); |
| 488 | return; |
| 489 | } else { |
| 490 | log.debug("MachO Zld digest={s} match", .{std.fmt.fmtSliceHexLower(&digest)}); |
| 491 | if (!self.cold_start) { |
| 492 | log.debug(" no need to relink objects", .{}); |
| 493 | needs_full_relink = false; |
| 494 | } else { |
| 495 | log.debug(" TODO parse prelinked binary and continue linking where we left off", .{}); |
| 496 | // TODO until such time however, perform a full relink of objects. |
| 497 | needs_full_relink = true; |
| 498 | } |
| 499 | } |
| 664 | 500 | } |
| 665 | | log.debug("MachO Zld prev_digest={s} new_digest={s}", .{ std.fmt.fmtSliceHexLower(prev_digest), std.fmt.fmtSliceHexLower(&digest) }); |
| 501 | log.debug("MachO Zld prev_digest={s} new_digest={s}", .{ |
| 502 | std.fmt.fmtSliceHexLower(prev_digest), |
| 503 | std.fmt.fmtSliceHexLower(&digest), |
| 504 | }); |
| 666 | 505 | |
| 667 | 506 | // We are about to change the output file to be different, so we invalidate the build hash now. |
| 668 | 507 | directory.handle.deleteFile(id_symlink_basename) catch |err| switch (err) { |
| ... | ... | @@ -670,7 +509,6 @@ fn linkWithZld(self: *MachO, comp: *Compilation) !void { |
| 670 | 509 | else => |e| return e, |
| 671 | 510 | }; |
| 672 | 511 | } |
| 673 | | |
| 674 | 512 | const full_out_path = try directory.join(arena, &[_][]const u8{self.base.options.emit.?.sub_path}); |
| 675 | 513 | |
| 676 | 514 | if (self.base.options.output_mode == .Obj) { |
| ... | ... | @@ -697,270 +535,456 @@ fn linkWithZld(self: *MachO, comp: *Compilation) !void { |
| 697 | 535 | try fs.cwd().copyFile(the_object_path, fs.cwd(), full_out_path, .{}); |
| 698 | 536 | } |
| 699 | 537 | } else { |
| 700 | | // Positional arguments to the linker such as object files and static archives. |
| 701 | | var positionals = std.ArrayList([]const u8).init(arena); |
| 702 | | |
| 703 | | try positionals.appendSlice(self.base.options.objects); |
| 538 | if (use_stage1) { |
| 539 | const sub_path = self.base.options.emit.?.sub_path; |
| 540 | self.base.file = try directory.handle.createFile(sub_path, .{ |
| 541 | .truncate = true, |
| 542 | .read = true, |
| 543 | .mode = link.determineMode(self.base.options), |
| 544 | }); |
| 545 | try self.populateMissingMetadata(); |
| 704 | 546 | |
| 705 | | for (comp.c_object_table.keys()) |key| { |
| 706 | | try positionals.append(key.status.success.object_path); |
| 547 | // TODO mimicking insertion of null symbol from incremental linker. |
| 548 | // This will need to moved. |
| 549 | try self.locals.append(self.base.allocator, .{ |
| 550 | .n_strx = 0, |
| 551 | .n_type = macho.N_UNDF, |
| 552 | .n_sect = 0, |
| 553 | .n_desc = 0, |
| 554 | .n_value = 0, |
| 555 | }); |
| 556 | try self.strtab.append(self.base.allocator, 0); |
| 707 | 557 | } |
| 708 | 558 | |
| 709 | | if (module_obj_path) |p| { |
| 710 | | try positionals.append(p); |
| 711 | | } |
| 559 | if (needs_full_relink) { |
| 560 | self.objects.clearRetainingCapacity(); |
| 561 | self.archives.clearRetainingCapacity(); |
| 562 | self.dylibs.clearRetainingCapacity(); |
| 563 | self.dylibs_map.clearRetainingCapacity(); |
| 564 | self.referenced_dylibs.clearRetainingCapacity(); |
| 712 | 565 | |
| 713 | | try positionals.append(comp.compiler_rt_static_lib.?.full_object_path); |
| 566 | // TODO figure out how to clear atoms from objects, etc. |
| 714 | 567 | |
| 715 | | // libc++ dep |
| 716 | | if (self.base.options.link_libcpp) { |
| 717 | | try positionals.append(comp.libcxxabi_static_lib.?.full_object_path); |
| 718 | | try positionals.append(comp.libcxx_static_lib.?.full_object_path); |
| 719 | | } |
| 568 | // Positional arguments to the linker such as object files and static archives. |
| 569 | var positionals = std.ArrayList([]const u8).init(arena); |
| 720 | 570 | |
| 721 | | // Shared and static libraries passed via `-l` flag. |
| 722 | | var search_lib_names = std.ArrayList([]const u8).init(arena); |
| 571 | try positionals.appendSlice(self.base.options.objects); |
| 723 | 572 | |
| 724 | | const system_libs = self.base.options.system_libs.keys(); |
| 725 | | for (system_libs) |link_lib| { |
| 726 | | // By this time, we depend on these libs being dynamically linked libraries and not static libraries |
| 727 | | // (the check for that needs to be earlier), but they could be full paths to .dylib files, in which |
| 728 | | // case we want to avoid prepending "-l". |
| 729 | | if (Compilation.classifyFileExt(link_lib) == .shared_library) { |
| 730 | | try positionals.append(link_lib); |
| 731 | | continue; |
| 573 | for (comp.c_object_table.keys()) |key| { |
| 574 | try positionals.append(key.status.success.object_path); |
| 732 | 575 | } |
| 733 | 576 | |
| 734 | | try search_lib_names.append(link_lib); |
| 735 | | } |
| 577 | if (module_obj_path) |p| { |
| 578 | try positionals.append(p); |
| 579 | } |
| 736 | 580 | |
| 737 | | var lib_dirs = std.ArrayList([]const u8).init(arena); |
| 738 | | for (self.base.options.lib_dirs) |dir| { |
| 739 | | if (try resolveSearchDir(arena, dir, self.base.options.sysroot)) |search_dir| { |
| 740 | | try lib_dirs.append(search_dir); |
| 741 | | } else { |
| 742 | | log.warn("directory not found for '-L{s}'", .{dir}); |
| 581 | if (comp.compiler_rt_static_lib) |lib| { |
| 582 | try positionals.append(lib.full_object_path); |
| 743 | 583 | } |
| 744 | | } |
| 745 | 584 | |
| 746 | | var libs = std.ArrayList([]const u8).init(arena); |
| 747 | | var lib_not_found = false; |
| 748 | | for (search_lib_names.items) |lib_name| { |
| 749 | | // Assume ld64 default: -search_paths_first |
| 750 | | // Look in each directory for a dylib (stub first), and then for archive |
| 751 | | // TODO implement alternative: -search_dylibs_first |
| 752 | | for (&[_][]const u8{ ".tbd", ".dylib", ".a" }) |ext| { |
| 753 | | if (try resolveLib(arena, lib_dirs.items, lib_name, ext)) |full_path| { |
| 754 | | try libs.append(full_path); |
| 755 | | break; |
| 585 | // libc++ dep |
| 586 | if (self.base.options.link_libcpp) { |
| 587 | try positionals.append(comp.libcxxabi_static_lib.?.full_object_path); |
| 588 | try positionals.append(comp.libcxx_static_lib.?.full_object_path); |
| 589 | } |
| 590 | |
| 591 | // Shared and static libraries passed via `-l` flag. |
| 592 | var search_lib_names = std.ArrayList([]const u8).init(arena); |
| 593 | |
| 594 | const system_libs = self.base.options.system_libs.keys(); |
| 595 | for (system_libs) |link_lib| { |
| 596 | // By this time, we depend on these libs being dynamically linked libraries and not static libraries |
| 597 | // (the check for that needs to be earlier), but they could be full paths to .dylib files, in which |
| 598 | // case we want to avoid prepending "-l". |
| 599 | if (Compilation.classifyFileExt(link_lib) == .shared_library) { |
| 600 | try positionals.append(link_lib); |
| 601 | continue; |
| 756 | 602 | } |
| 757 | | } else { |
| 758 | | log.warn("library not found for '-l{s}'", .{lib_name}); |
| 759 | | lib_not_found = true; |
| 603 | |
| 604 | try search_lib_names.append(link_lib); |
| 760 | 605 | } |
| 761 | | } |
| 762 | 606 | |
| 763 | | if (lib_not_found) { |
| 764 | | log.warn("Library search paths:", .{}); |
| 765 | | for (lib_dirs.items) |dir| { |
| 766 | | log.warn(" {s}", .{dir}); |
| 607 | var lib_dirs = std.ArrayList([]const u8).init(arena); |
| 608 | for (self.base.options.lib_dirs) |dir| { |
| 609 | if (try resolveSearchDir(arena, dir, self.base.options.sysroot)) |search_dir| { |
| 610 | try lib_dirs.append(search_dir); |
| 611 | } else { |
| 612 | log.warn("directory not found for '-L{s}'", .{dir}); |
| 613 | } |
| 767 | 614 | } |
| 768 | | } |
| 769 | 615 | |
| 770 | | // If we were given the sysroot, try to look there first for libSystem.B.{dylib, tbd}. |
| 771 | | var libsystem_available = false; |
| 772 | | if (self.base.options.sysroot != null) blk: { |
| 773 | | // Try stub file first. If we hit it, then we're done as the stub file |
| 774 | | // re-exports every single symbol definition. |
| 775 | | if (try resolveLib(arena, lib_dirs.items, "System", ".tbd")) |full_path| { |
| 776 | | try libs.append(full_path); |
| 777 | | libsystem_available = true; |
| 778 | | break :blk; |
| 616 | var libs = std.ArrayList([]const u8).init(arena); |
| 617 | var lib_not_found = false; |
| 618 | for (search_lib_names.items) |lib_name| { |
| 619 | // Assume ld64 default: -search_paths_first |
| 620 | // Look in each directory for a dylib (stub first), and then for archive |
| 621 | // TODO implement alternative: -search_dylibs_first |
| 622 | for (&[_][]const u8{ ".tbd", ".dylib", ".a" }) |ext| { |
| 623 | if (try resolveLib(arena, lib_dirs.items, lib_name, ext)) |full_path| { |
| 624 | try libs.append(full_path); |
| 625 | break; |
| 626 | } |
| 627 | } else { |
| 628 | log.warn("library not found for '-l{s}'", .{lib_name}); |
| 629 | lib_not_found = true; |
| 630 | } |
| 631 | } |
| 632 | |
| 633 | if (lib_not_found) { |
| 634 | log.warn("Library search paths:", .{}); |
| 635 | for (lib_dirs.items) |dir| { |
| 636 | log.warn(" {s}", .{dir}); |
| 637 | } |
| 779 | 638 | } |
| 780 | | // If we didn't hit the stub file, try .dylib next. However, libSystem.dylib |
| 781 | | // doesn't export libc.dylib which we'll need to resolve subsequently also. |
| 782 | | if (try resolveLib(arena, lib_dirs.items, "System", ".dylib")) |libsystem_path| { |
| 783 | | if (try resolveLib(arena, lib_dirs.items, "c", ".dylib")) |libc_path| { |
| 784 | | try libs.append(libsystem_path); |
| 785 | | try libs.append(libc_path); |
| 639 | |
| 640 | // If we were given the sysroot, try to look there first for libSystem.B.{dylib, tbd}. |
| 641 | var libsystem_available = false; |
| 642 | if (self.base.options.sysroot != null) blk: { |
| 643 | // Try stub file first. If we hit it, then we're done as the stub file |
| 644 | // re-exports every single symbol definition. |
| 645 | if (try resolveLib(arena, lib_dirs.items, "System", ".tbd")) |full_path| { |
| 646 | try libs.append(full_path); |
| 786 | 647 | libsystem_available = true; |
| 787 | 648 | break :blk; |
| 788 | 649 | } |
| 650 | // If we didn't hit the stub file, try .dylib next. However, libSystem.dylib |
| 651 | // doesn't export libc.dylib which we'll need to resolve subsequently also. |
| 652 | if (try resolveLib(arena, lib_dirs.items, "System", ".dylib")) |libsystem_path| { |
| 653 | if (try resolveLib(arena, lib_dirs.items, "c", ".dylib")) |libc_path| { |
| 654 | try libs.append(libsystem_path); |
| 655 | try libs.append(libc_path); |
| 656 | libsystem_available = true; |
| 657 | break :blk; |
| 658 | } |
| 659 | } |
| 660 | } |
| 661 | if (!libsystem_available) { |
| 662 | const full_path = try comp.zig_lib_directory.join(arena, &[_][]const u8{ |
| 663 | "libc", "darwin", "libSystem.B.tbd", |
| 664 | }); |
| 665 | try libs.append(full_path); |
| 789 | 666 | } |
| 790 | | } |
| 791 | | if (!libsystem_available) { |
| 792 | | const full_path = try comp.zig_lib_directory.join(arena, &[_][]const u8{ |
| 793 | | "libc", "darwin", "libSystem.B.tbd", |
| 794 | | }); |
| 795 | | try libs.append(full_path); |
| 796 | | } |
| 797 | 667 | |
| 798 | | // frameworks |
| 799 | | var framework_dirs = std.ArrayList([]const u8).init(arena); |
| 800 | | for (self.base.options.framework_dirs) |dir| { |
| 801 | | if (try resolveSearchDir(arena, dir, self.base.options.sysroot)) |search_dir| { |
| 802 | | try framework_dirs.append(search_dir); |
| 803 | | } else { |
| 804 | | log.warn("directory not found for '-F{s}'", .{dir}); |
| 668 | // frameworks |
| 669 | var framework_dirs = std.ArrayList([]const u8).init(arena); |
| 670 | for (self.base.options.framework_dirs) |dir| { |
| 671 | if (try resolveSearchDir(arena, dir, self.base.options.sysroot)) |search_dir| { |
| 672 | try framework_dirs.append(search_dir); |
| 673 | } else { |
| 674 | log.warn("directory not found for '-F{s}'", .{dir}); |
| 675 | } |
| 805 | 676 | } |
| 806 | | } |
| 807 | 677 | |
| 808 | | var framework_not_found = false; |
| 809 | | for (self.base.options.frameworks) |framework| { |
| 810 | | for (&[_][]const u8{ ".tbd", ".dylib", "" }) |ext| { |
| 811 | | if (try resolveFramework(arena, framework_dirs.items, framework, ext)) |full_path| { |
| 812 | | try libs.append(full_path); |
| 813 | | break; |
| 678 | var framework_not_found = false; |
| 679 | for (self.base.options.frameworks) |framework| { |
| 680 | for (&[_][]const u8{ ".tbd", ".dylib", "" }) |ext| { |
| 681 | if (try resolveFramework(arena, framework_dirs.items, framework, ext)) |full_path| { |
| 682 | try libs.append(full_path); |
| 683 | break; |
| 684 | } |
| 685 | } else { |
| 686 | log.warn("framework not found for '-framework {s}'", .{framework}); |
| 687 | framework_not_found = true; |
| 814 | 688 | } |
| 815 | | } else { |
| 816 | | log.warn("framework not found for '-framework {s}'", .{framework}); |
| 817 | | framework_not_found = true; |
| 818 | 689 | } |
| 819 | | } |
| 820 | 690 | |
| 821 | | if (framework_not_found) { |
| 822 | | log.warn("Framework search paths:", .{}); |
| 823 | | for (framework_dirs.items) |dir| { |
| 824 | | log.warn(" {s}", .{dir}); |
| 691 | if (framework_not_found) { |
| 692 | log.warn("Framework search paths:", .{}); |
| 693 | for (framework_dirs.items) |dir| { |
| 694 | log.warn(" {s}", .{dir}); |
| 695 | } |
| 825 | 696 | } |
| 826 | | } |
| 827 | 697 | |
| 828 | | // rpaths |
| 829 | | var rpath_table = std.StringArrayHashMap(void).init(arena); |
| 830 | | for (self.base.options.rpath_list) |rpath| { |
| 831 | | if (rpath_table.contains(rpath)) continue; |
| 832 | | try rpath_table.putNoClobber(rpath, {}); |
| 833 | | } |
| 698 | // rpaths |
| 699 | var rpath_table = std.StringArrayHashMap(void).init(arena); |
| 700 | for (self.base.options.rpath_list) |rpath| { |
| 701 | if (rpath_table.contains(rpath)) continue; |
| 702 | const cmdsize = @intCast(u32, mem.alignForwardGeneric( |
| 703 | u64, |
| 704 | @sizeOf(macho.rpath_command) + rpath.len + 1, |
| 705 | @sizeOf(u64), |
| 706 | )); |
| 707 | var rpath_cmd = commands.emptyGenericCommandWithData(macho.rpath_command{ |
| 708 | .cmd = macho.LC_RPATH, |
| 709 | .cmdsize = cmdsize, |
| 710 | .path = @sizeOf(macho.rpath_command), |
| 711 | }); |
| 712 | rpath_cmd.data = try self.base.allocator.alloc(u8, cmdsize - rpath_cmd.inner.path); |
| 713 | mem.set(u8, rpath_cmd.data, 0); |
| 714 | mem.copy(u8, rpath_cmd.data, rpath); |
| 715 | try self.load_commands.append(self.base.allocator, .{ .Rpath = rpath_cmd }); |
| 716 | try rpath_table.putNoClobber(rpath, {}); |
| 717 | self.load_commands_dirty = true; |
| 718 | } |
| 834 | 719 | |
| 835 | | var rpaths = std.ArrayList([]const u8).init(arena); |
| 836 | | try rpaths.ensureCapacity(rpath_table.count()); |
| 837 | | for (rpath_table.keys()) |*key| { |
| 838 | | rpaths.appendAssumeCapacity(key.*); |
| 839 | | } |
| 720 | if (self.base.options.verbose_link) { |
| 721 | var argv = std.ArrayList([]const u8).init(arena); |
| 840 | 722 | |
| 841 | | if (self.base.options.verbose_link) { |
| 842 | | var argv = std.ArrayList([]const u8).init(arena); |
| 723 | try argv.append("zig"); |
| 724 | try argv.append("ld"); |
| 843 | 725 | |
| 844 | | try argv.append("zig"); |
| 845 | | try argv.append("ld"); |
| 726 | if (is_exe_or_dyn_lib) { |
| 727 | try argv.append("-dynamic"); |
| 728 | } |
| 846 | 729 | |
| 847 | | if (is_exe_or_dyn_lib) { |
| 848 | | try argv.append("-dynamic"); |
| 849 | | } |
| 730 | if (is_dyn_lib) { |
| 731 | try argv.append("-dylib"); |
| 850 | 732 | |
| 851 | | if (is_dyn_lib) { |
| 852 | | try argv.append("-dylib"); |
| 733 | const install_name = try std.fmt.allocPrint(arena, "@rpath/{s}", .{ |
| 734 | self.base.options.emit.?.sub_path, |
| 735 | }); |
| 736 | try argv.append("-install_name"); |
| 737 | try argv.append(install_name); |
| 738 | } |
| 853 | 739 | |
| 854 | | const install_name = try std.fmt.allocPrint(arena, "@rpath/{s}", .{ |
| 855 | | self.base.options.emit.?.sub_path, |
| 856 | | }); |
| 857 | | try argv.append("-install_name"); |
| 858 | | try argv.append(install_name); |
| 859 | | } |
| 740 | if (self.base.options.sysroot) |syslibroot| { |
| 741 | try argv.append("-syslibroot"); |
| 742 | try argv.append(syslibroot); |
| 743 | } |
| 860 | 744 | |
| 861 | | if (self.base.options.sysroot) |syslibroot| { |
| 862 | | try argv.append("-syslibroot"); |
| 863 | | try argv.append(syslibroot); |
| 864 | | } |
| 745 | for (rpath_table.keys()) |rpath| { |
| 746 | try argv.append("-rpath"); |
| 747 | try argv.append(rpath); |
| 748 | } |
| 865 | 749 | |
| 866 | | for (rpaths.items) |rpath| { |
| 867 | | try argv.append("-rpath"); |
| 868 | | try argv.append(rpath); |
| 869 | | } |
| 750 | try argv.appendSlice(positionals.items); |
| 870 | 751 | |
| 871 | | try argv.appendSlice(positionals.items); |
| 752 | try argv.append("-o"); |
| 753 | try argv.append(full_out_path); |
| 872 | 754 | |
| 873 | | try argv.append("-o"); |
| 874 | | try argv.append(full_out_path); |
| 755 | try argv.append("-lSystem"); |
| 756 | try argv.append("-lc"); |
| 875 | 757 | |
| 876 | | try argv.append("-lSystem"); |
| 877 | | try argv.append("-lc"); |
| 758 | for (search_lib_names.items) |l_name| { |
| 759 | try argv.append(try std.fmt.allocPrint(arena, "-l{s}", .{l_name})); |
| 760 | } |
| 878 | 761 | |
| 879 | | for (search_lib_names.items) |l_name| { |
| 880 | | try argv.append(try std.fmt.allocPrint(arena, "-l{s}", .{l_name})); |
| 881 | | } |
| 762 | for (self.base.options.lib_dirs) |lib_dir| { |
| 763 | try argv.append(try std.fmt.allocPrint(arena, "-L{s}", .{lib_dir})); |
| 764 | } |
| 882 | 765 | |
| 883 | | for (self.base.options.lib_dirs) |lib_dir| { |
| 884 | | try argv.append(try std.fmt.allocPrint(arena, "-L{s}", .{lib_dir})); |
| 885 | | } |
| 766 | for (self.base.options.frameworks) |framework| { |
| 767 | try argv.append(try std.fmt.allocPrint(arena, "-framework {s}", .{framework})); |
| 768 | } |
| 886 | 769 | |
| 887 | | for (self.base.options.frameworks) |framework| { |
| 888 | | try argv.append(try std.fmt.allocPrint(arena, "-framework {s}", .{framework})); |
| 889 | | } |
| 770 | for (self.base.options.framework_dirs) |framework_dir| { |
| 771 | try argv.append(try std.fmt.allocPrint(arena, "-F{s}", .{framework_dir})); |
| 772 | } |
| 890 | 773 | |
| 891 | | for (self.base.options.framework_dirs) |framework_dir| { |
| 892 | | try argv.append(try std.fmt.allocPrint(arena, "-F{s}", .{framework_dir})); |
| 774 | Compilation.dump_argv(argv.items); |
| 893 | 775 | } |
| 894 | 776 | |
| 895 | | Compilation.dump_argv(argv.items); |
| 777 | try self.parseInputFiles(positionals.items, self.base.options.sysroot); |
| 778 | try self.parseLibs(libs.items, self.base.options.sysroot); |
| 896 | 779 | } |
| 897 | 780 | |
| 898 | | const sub_path = self.base.options.emit.?.sub_path; |
| 899 | | self.base.file = try directory.handle.createFile(sub_path, .{ |
| 900 | | .truncate = true, |
| 901 | | .read = true, |
| 902 | | .mode = link.determineMode(self.base.options), |
| 903 | | }); |
| 904 | | |
| 905 | | // TODO mimicking insertion of null symbol from incremental linker. |
| 906 | | // This will need to moved. |
| 907 | | try self.locals.append(self.base.allocator, .{ |
| 908 | | .n_strx = 0, |
| 909 | | .n_type = macho.N_UNDF, |
| 910 | | .n_sect = 0, |
| 911 | | .n_desc = 0, |
| 912 | | .n_value = 0, |
| 913 | | }); |
| 914 | | try self.strtab.append(self.base.allocator, 0); |
| 915 | | |
| 916 | | try self.populateMetadata(); |
| 917 | | try self.addRpathLCs(rpaths.items); |
| 918 | | try self.parseInputFiles(positionals.items, self.base.options.sysroot); |
| 919 | | try self.parseLibs(libs.items, self.base.options.sysroot); |
| 920 | | try self.resolveSymbols(); |
| 921 | | try self.parseTextBlocks(); |
| 922 | | try self.addLoadDylibLCs(); |
| 923 | | try self.addDataInCodeLC(); |
| 924 | | try self.addCodeSignatureLC(); |
| 781 | if (self.bss_section_index) |idx| { |
| 782 | const seg = &self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 783 | const sect = &seg.sections.items[idx]; |
| 784 | sect.offset = self.bss_file_offset; |
| 785 | } |
| 786 | if (self.tlv_bss_section_index) |idx| { |
| 787 | const seg = &self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 788 | const sect = &seg.sections.items[idx]; |
| 789 | sect.offset = self.tlv_bss_file_offset; |
| 790 | } |
| 925 | 791 | |
| 926 | | { |
| 927 | | // Add dyld_stub_binder as the final GOT entry. |
| 928 | | const n_strx = self.strtab_dir.getKeyAdapted(@as([]const u8, "dyld_stub_binder"), StringIndexAdapter{ |
| 929 | | .bytes = &self.strtab, |
| 930 | | }) orelse unreachable; |
| 931 | | const resolv = self.symbol_resolver.get(n_strx) orelse unreachable; |
| 932 | | const got_index = @intCast(u32, self.got_entries.items.len); |
| 933 | | const got_entry = GotIndirectionKey{ |
| 934 | | .where = .undef, |
| 935 | | .where_index = resolv.where_index, |
| 936 | | }; |
| 937 | | try self.got_entries.append(self.base.allocator, got_entry); |
| 938 | | try self.got_entries_map.putNoClobber(self.base.allocator, got_entry, got_index); |
| 792 | for (self.objects.items) |*object, object_id| { |
| 793 | if (object.analyzed) continue; |
| 794 | try self.resolveSymbolsInObject(@intCast(u16, object_id)); |
| 939 | 795 | } |
| 940 | 796 | |
| 941 | | try self.sortSections(); |
| 942 | | try self.allocateTextSegment(); |
| 943 | | try self.allocateDataConstSegment(); |
| 944 | | try self.allocateDataSegment(); |
| 945 | | self.allocateLinkeditSegment(); |
| 946 | | try self.allocateTextBlocks(); |
| 947 | | try self.flushZld(); |
| 797 | try self.resolveSymbolsInArchives(); |
| 798 | try self.resolveDyldStubBinder(); |
| 799 | try self.createDyldPrivateAtom(); |
| 800 | try self.createStubHelperPreambleAtom(); |
| 801 | try self.resolveSymbolsInDylibs(); |
| 802 | try self.createDsoHandleAtom(); |
| 803 | try self.addCodeSignatureLC(); |
| 804 | |
| 805 | for (self.unresolved.keys()) |index| { |
| 806 | const sym = self.undefs.items[index]; |
| 807 | const sym_name = self.getString(sym.n_strx); |
| 808 | const resolv = self.symbol_resolver.get(sym.n_strx) orelse unreachable; |
| 809 | |
| 810 | log.err("undefined reference to symbol '{s}'", .{sym_name}); |
| 811 | log.err(" first referenced in '{s}'", .{self.objects.items[resolv.file].name}); |
| 812 | } |
| 813 | if (self.unresolved.count() > 0) { |
| 814 | return error.UndefinedSymbolReference; |
| 815 | } |
| 816 | |
| 817 | try self.createTentativeDefAtoms(); |
| 818 | try self.parseObjectsIntoAtoms(); |
| 819 | try self.allocateGlobalSymbols(); |
| 820 | try self.writeAtoms(); |
| 821 | |
| 822 | if (self.bss_section_index) |idx| { |
| 823 | const seg = &self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 824 | const sect = &seg.sections.items[idx]; |
| 825 | self.bss_file_offset = sect.offset; |
| 826 | sect.offset = 0; |
| 827 | } |
| 828 | if (self.tlv_bss_section_index) |idx| { |
| 829 | const seg = &self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 830 | const sect = &seg.sections.items[idx]; |
| 831 | self.tlv_bss_file_offset = sect.offset; |
| 832 | sect.offset = 0; |
| 833 | } |
| 834 | |
| 835 | try self.flushModule(comp); |
| 948 | 836 | } |
| 949 | 837 | |
| 950 | | if (!self.base.options.disable_lld_caching) { |
| 838 | cache: { |
| 839 | if (use_stage1 and self.base.options.disable_lld_caching) break :cache; |
| 951 | 840 | // Update the file with the digest. If it fails we can continue; it only |
| 952 | 841 | // means that the next invocation will have an unnecessary cache miss. |
| 953 | 842 | Cache.writeSmallFile(directory.handle, id_symlink_basename, &digest) catch |err| { |
| 954 | | log.warn("failed to save linking hash digest file: {s}", .{@errorName(err)}); |
| 843 | log.debug("failed to save linking hash digest file: {s}", .{@errorName(err)}); |
| 955 | 844 | }; |
| 956 | 845 | // Again failure here only means an unnecessary cache miss. |
| 957 | 846 | man.writeManifest() catch |err| { |
| 958 | | log.warn("failed to write cache manifest when linking: {s}", .{@errorName(err)}); |
| 847 | log.debug("failed to write cache manifest when linking: {s}", .{@errorName(err)}); |
| 959 | 848 | }; |
| 960 | 849 | // We hang on to this lock so that the output file path can be used without |
| 961 | 850 | // other processes clobbering it. |
| 962 | 851 | self.base.lock = man.toOwnedLock(); |
| 963 | 852 | } |
| 853 | |
| 854 | self.cold_start = false; |
| 855 | } |
| 856 | |
| 857 | pub fn flushModule(self: *MachO, comp: *Compilation) !void { |
| 858 | _ = comp; |
| 859 | |
| 860 | const tracy = trace(@src()); |
| 861 | defer tracy.end(); |
| 862 | |
| 863 | try self.setEntryPoint(); |
| 864 | try self.updateSectionOrdinals(); |
| 865 | try self.writeLinkeditSegment(); |
| 866 | |
| 867 | if (self.d_sym) |*ds| { |
| 868 | // Flush debug symbols bundle. |
| 869 | try ds.flushModule(self.base.allocator, self.base.options); |
| 870 | } |
| 871 | |
| 872 | if (self.requires_adhoc_codesig) { |
| 873 | // Preallocate space for the code signature. |
| 874 | // We need to do this at this stage so that we have the load commands with proper values |
| 875 | // written out to the file. |
| 876 | // The most important here is to have the correct vm and filesize of the __LINKEDIT segment |
| 877 | // where the code signature goes into. |
| 878 | try self.writeCodeSignaturePadding(); |
| 879 | } |
| 880 | |
| 881 | try self.writeLoadCommands(); |
| 882 | try self.writeHeader(); |
| 883 | |
| 884 | if (self.entry_addr == null and self.base.options.output_mode == .Exe) { |
| 885 | log.debug("flushing. no_entry_point_found = true", .{}); |
| 886 | self.error_flags.no_entry_point_found = true; |
| 887 | } else { |
| 888 | log.debug("flushing. no_entry_point_found = false", .{}); |
| 889 | self.error_flags.no_entry_point_found = false; |
| 890 | } |
| 891 | |
| 892 | assert(!self.load_commands_dirty); |
| 893 | |
| 894 | if (self.requires_adhoc_codesig) { |
| 895 | try self.writeCodeSignature(); // code signing always comes last |
| 896 | } |
| 897 | } |
| 898 | |
| 899 | fn resolveSearchDir( |
| 900 | arena: *Allocator, |
| 901 | dir: []const u8, |
| 902 | syslibroot: ?[]const u8, |
| 903 | ) !?[]const u8 { |
| 904 | var candidates = std.ArrayList([]const u8).init(arena); |
| 905 | |
| 906 | if (fs.path.isAbsolute(dir)) { |
| 907 | if (syslibroot) |root| { |
| 908 | const common_dir = if (std.Target.current.os.tag == .windows) blk: { |
| 909 | // We need to check for disk designator and strip it out from dir path so |
| 910 | // that we can concat dir with syslibroot. |
| 911 | // TODO we should backport this mechanism to 'MachO.Dylib.parseDependentLibs()' |
| 912 | const disk_designator = fs.path.diskDesignatorWindows(dir); |
| 913 | |
| 914 | if (mem.indexOf(u8, dir, disk_designator)) |where| { |
| 915 | break :blk dir[where + disk_designator.len ..]; |
| 916 | } |
| 917 | |
| 918 | break :blk dir; |
| 919 | } else dir; |
| 920 | const full_path = try fs.path.join(arena, &[_][]const u8{ root, common_dir }); |
| 921 | try candidates.append(full_path); |
| 922 | } |
| 923 | } |
| 924 | |
| 925 | try candidates.append(dir); |
| 926 | |
| 927 | for (candidates.items) |candidate| { |
| 928 | // Verify that search path actually exists |
| 929 | var tmp = fs.cwd().openDir(candidate, .{}) catch |err| switch (err) { |
| 930 | error.FileNotFound => continue, |
| 931 | else => |e| return e, |
| 932 | }; |
| 933 | defer tmp.close(); |
| 934 | |
| 935 | return candidate; |
| 936 | } |
| 937 | |
| 938 | return null; |
| 939 | } |
| 940 | |
| 941 | fn resolveLib( |
| 942 | arena: *Allocator, |
| 943 | search_dirs: []const []const u8, |
| 944 | name: []const u8, |
| 945 | ext: []const u8, |
| 946 | ) !?[]const u8 { |
| 947 | const search_name = try std.fmt.allocPrint(arena, "lib{s}{s}", .{ name, ext }); |
| 948 | |
| 949 | for (search_dirs) |dir| { |
| 950 | const full_path = try fs.path.join(arena, &[_][]const u8{ dir, search_name }); |
| 951 | |
| 952 | // Check if the file exists. |
| 953 | const tmp = fs.cwd().openFile(full_path, .{}) catch |err| switch (err) { |
| 954 | error.FileNotFound => continue, |
| 955 | else => |e| return e, |
| 956 | }; |
| 957 | defer tmp.close(); |
| 958 | |
| 959 | return full_path; |
| 960 | } |
| 961 | |
| 962 | return null; |
| 963 | } |
| 964 | |
| 965 | fn resolveFramework( |
| 966 | arena: *Allocator, |
| 967 | search_dirs: []const []const u8, |
| 968 | name: []const u8, |
| 969 | ext: []const u8, |
| 970 | ) !?[]const u8 { |
| 971 | const search_name = try std.fmt.allocPrint(arena, "{s}{s}", .{ name, ext }); |
| 972 | const prefix_path = try std.fmt.allocPrint(arena, "{s}.framework", .{name}); |
| 973 | |
| 974 | for (search_dirs) |dir| { |
| 975 | const full_path = try fs.path.join(arena, &[_][]const u8{ dir, prefix_path, search_name }); |
| 976 | |
| 977 | // Check if the file exists. |
| 978 | const tmp = fs.cwd().openFile(full_path, .{}) catch |err| switch (err) { |
| 979 | error.FileNotFound => continue, |
| 980 | else => |e| return e, |
| 981 | }; |
| 982 | defer tmp.close(); |
| 983 | |
| 984 | return full_path; |
| 985 | } |
| 986 | |
| 987 | return null; |
| 964 | 988 | } |
| 965 | 989 | |
| 966 | 990 | fn parseObject(self: *MachO, path: []const u8) !bool { |
| ... | ... | @@ -1080,6 +1104,7 @@ pub fn parseDylib(self: *MachO, path: []const u8, opts: DylibCreateOpts) ParseDy |
| 1080 | 1104 | try self.dylibs_map.putNoClobber(self.base.allocator, dylib.id.?.name, dylib_id); |
| 1081 | 1105 | |
| 1082 | 1106 | if (!(opts.is_dependent or self.referenced_dylibs.contains(dylib_id))) { |
| 1107 | try self.addLoadDylibLC(dylib_id); |
| 1083 | 1108 | try self.referenced_dylibs.putNoClobber(self.base.allocator, dylib_id, {}); |
| 1084 | 1109 | } |
| 1085 | 1110 | |
| ... | ... | @@ -1098,6 +1123,7 @@ fn parseInputFiles(self: *MachO, files: []const []const u8, syslibroot: ?[]const |
| 1098 | 1123 | break :full_path try self.base.allocator.dupe(u8, path); |
| 1099 | 1124 | }; |
| 1100 | 1125 | defer self.base.allocator.free(full_path); |
| 1126 | log.debug("parsing input file path '{s}'", .{full_path}); |
| 1101 | 1127 | |
| 1102 | 1128 | if (try self.parseObject(full_path)) continue; |
| 1103 | 1129 | if (try self.parseArchive(full_path)) continue; |
| ... | ... | @@ -1111,6 +1137,7 @@ fn parseInputFiles(self: *MachO, files: []const []const u8, syslibroot: ?[]const |
| 1111 | 1137 | |
| 1112 | 1138 | fn parseLibs(self: *MachO, libs: []const []const u8, syslibroot: ?[]const u8) !void { |
| 1113 | 1139 | for (libs) |lib| { |
| 1140 | log.debug("parsing lib path '{s}'", .{lib}); |
| 1114 | 1141 | if (try self.parseDylib(lib, .{ |
| 1115 | 1142 | .syslibroot = syslibroot, |
| 1116 | 1143 | })) continue; |
| ... | ... | @@ -1126,18 +1153,19 @@ pub const MatchingSection = struct { |
| 1126 | 1153 | }; |
| 1127 | 1154 | |
| 1128 | 1155 | pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSection { |
| 1129 | | const text_seg = &self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 1130 | | const data_const_seg = &self.load_commands.items[self.data_const_segment_cmd_index.?].Segment; |
| 1131 | | const data_seg = &self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 1132 | 1156 | const segname = commands.segmentName(sect); |
| 1133 | 1157 | const sectname = commands.sectionName(sect); |
| 1134 | | |
| 1135 | 1158 | const res: ?MatchingSection = blk: { |
| 1136 | 1159 | switch (commands.sectionType(sect)) { |
| 1137 | 1160 | macho.S_4BYTE_LITERALS, macho.S_8BYTE_LITERALS, macho.S_16BYTE_LITERALS => { |
| 1138 | 1161 | if (self.text_const_section_index == null) { |
| 1139 | | self.text_const_section_index = @intCast(u16, text_seg.sections.items.len); |
| 1140 | | try text_seg.addSection(self.base.allocator, "__const", .{}); |
| 1162 | self.text_const_section_index = try self.allocateSection( |
| 1163 | self.text_segment_cmd_index.?, |
| 1164 | "__const", |
| 1165 | sect.size, |
| 1166 | sect.@"align", |
| 1167 | .{}, |
| 1168 | ); |
| 1141 | 1169 | } |
| 1142 | 1170 | |
| 1143 | 1171 | break :blk .{ |
| ... | ... | @@ -1150,10 +1178,13 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1150 | 1178 | // TODO it seems the common values within the sections in objects are deduplicated/merged |
| 1151 | 1179 | // on merging the sections' contents. |
| 1152 | 1180 | if (self.objc_methname_section_index == null) { |
| 1153 | | self.objc_methname_section_index = @intCast(u16, text_seg.sections.items.len); |
| 1154 | | try text_seg.addSection(self.base.allocator, "__objc_methname", .{ |
| 1155 | | .flags = macho.S_CSTRING_LITERALS, |
| 1156 | | }); |
| 1181 | self.objc_methname_section_index = try self.allocateSection( |
| 1182 | self.text_segment_cmd_index.?, |
| 1183 | "__objc_methname", |
| 1184 | sect.size, |
| 1185 | sect.@"align", |
| 1186 | .{}, |
| 1187 | ); |
| 1157 | 1188 | } |
| 1158 | 1189 | |
| 1159 | 1190 | break :blk .{ |
| ... | ... | @@ -1162,10 +1193,13 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1162 | 1193 | }; |
| 1163 | 1194 | } else if (mem.eql(u8, sectname, "__objc_methtype")) { |
| 1164 | 1195 | if (self.objc_methtype_section_index == null) { |
| 1165 | | self.objc_methtype_section_index = @intCast(u16, text_seg.sections.items.len); |
| 1166 | | try text_seg.addSection(self.base.allocator, "__objc_methtype", .{ |
| 1167 | | .flags = macho.S_CSTRING_LITERALS, |
| 1168 | | }); |
| 1196 | self.objc_methtype_section_index = try self.allocateSection( |
| 1197 | self.text_segment_cmd_index.?, |
| 1198 | "__objc_methtype", |
| 1199 | sect.size, |
| 1200 | sect.@"align", |
| 1201 | .{}, |
| 1202 | ); |
| 1169 | 1203 | } |
| 1170 | 1204 | |
| 1171 | 1205 | break :blk .{ |
| ... | ... | @@ -1174,8 +1208,13 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1174 | 1208 | }; |
| 1175 | 1209 | } else if (mem.eql(u8, sectname, "__objc_classname")) { |
| 1176 | 1210 | if (self.objc_classname_section_index == null) { |
| 1177 | | self.objc_classname_section_index = @intCast(u16, text_seg.sections.items.len); |
| 1178 | | try text_seg.addSection(self.base.allocator, "__objc_classname", .{}); |
| 1211 | self.objc_classname_section_index = try self.allocateSection( |
| 1212 | self.text_segment_cmd_index.?, |
| 1213 | "__objc_classname", |
| 1214 | sect.size, |
| 1215 | sect.@"align", |
| 1216 | .{}, |
| 1217 | ); |
| 1179 | 1218 | } |
| 1180 | 1219 | |
| 1181 | 1220 | break :blk .{ |
| ... | ... | @@ -1185,10 +1224,15 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1185 | 1224 | } |
| 1186 | 1225 | |
| 1187 | 1226 | if (self.cstring_section_index == null) { |
| 1188 | | self.cstring_section_index = @intCast(u16, text_seg.sections.items.len); |
| 1189 | | try text_seg.addSection(self.base.allocator, "__cstring", .{ |
| 1190 | | .flags = macho.S_CSTRING_LITERALS, |
| 1191 | | }); |
| 1227 | self.cstring_section_index = try self.allocateSection( |
| 1228 | self.text_segment_cmd_index.?, |
| 1229 | "__cstring", |
| 1230 | sect.size, |
| 1231 | sect.@"align", |
| 1232 | .{ |
| 1233 | .flags = macho.S_CSTRING_LITERALS, |
| 1234 | }, |
| 1235 | ); |
| 1192 | 1236 | } |
| 1193 | 1237 | |
| 1194 | 1238 | break :blk .{ |
| ... | ... | @@ -1199,27 +1243,37 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1199 | 1243 | macho.S_LITERAL_POINTERS => { |
| 1200 | 1244 | if (mem.eql(u8, segname, "__DATA") and mem.eql(u8, sectname, "__objc_selrefs")) { |
| 1201 | 1245 | if (self.objc_selrefs_section_index == null) { |
| 1202 | | self.objc_selrefs_section_index = @intCast(u16, data_seg.sections.items.len); |
| 1203 | | try data_seg.addSection(self.base.allocator, "__objc_selrefs", .{ |
| 1204 | | .flags = macho.S_LITERAL_POINTERS, |
| 1205 | | }); |
| 1246 | self.objc_selrefs_section_index = try self.allocateSection( |
| 1247 | self.data_segment_cmd_index.?, |
| 1248 | "__objc_selrefs", |
| 1249 | sect.size, |
| 1250 | sect.@"align", |
| 1251 | .{ |
| 1252 | .flags = macho.S_LITERAL_POINTERS, |
| 1253 | }, |
| 1254 | ); |
| 1206 | 1255 | } |
| 1207 | 1256 | |
| 1208 | 1257 | break :blk .{ |
| 1209 | 1258 | .seg = self.data_segment_cmd_index.?, |
| 1210 | 1259 | .sect = self.objc_selrefs_section_index.?, |
| 1211 | 1260 | }; |
| 1261 | } else { |
| 1262 | // TODO investigate |
| 1263 | break :blk null; |
| 1212 | 1264 | } |
| 1213 | | |
| 1214 | | // TODO investigate |
| 1215 | | break :blk null; |
| 1216 | 1265 | }, |
| 1217 | 1266 | macho.S_MOD_INIT_FUNC_POINTERS => { |
| 1218 | 1267 | if (self.mod_init_func_section_index == null) { |
| 1219 | | self.mod_init_func_section_index = @intCast(u16, data_const_seg.sections.items.len); |
| 1220 | | try data_const_seg.addSection(self.base.allocator, "__mod_init_func", .{ |
| 1221 | | .flags = macho.S_MOD_INIT_FUNC_POINTERS, |
| 1222 | | }); |
| 1268 | self.mod_init_func_section_index = try self.allocateSection( |
| 1269 | self.data_const_segment_cmd_index.?, |
| 1270 | "__mod_init_func", |
| 1271 | sect.size, |
| 1272 | sect.@"align", |
| 1273 | .{ |
| 1274 | .flags = macho.S_MOD_INIT_FUNC_POINTERS, |
| 1275 | }, |
| 1276 | ); |
| 1223 | 1277 | } |
| 1224 | 1278 | |
| 1225 | 1279 | break :blk .{ |
| ... | ... | @@ -1229,10 +1283,15 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1229 | 1283 | }, |
| 1230 | 1284 | macho.S_MOD_TERM_FUNC_POINTERS => { |
| 1231 | 1285 | if (self.mod_term_func_section_index == null) { |
| 1232 | | self.mod_term_func_section_index = @intCast(u16, data_const_seg.sections.items.len); |
| 1233 | | try data_const_seg.addSection(self.base.allocator, "__mod_term_func", .{ |
| 1234 | | .flags = macho.S_MOD_TERM_FUNC_POINTERS, |
| 1235 | | }); |
| 1286 | self.mod_term_func_section_index = try self.allocateSection( |
| 1287 | self.data_const_segment_cmd_index.?, |
| 1288 | "__mod_term_func", |
| 1289 | sect.size, |
| 1290 | sect.@"align", |
| 1291 | .{ |
| 1292 | .flags = macho.S_MOD_TERM_FUNC_POINTERS, |
| 1293 | }, |
| 1294 | ); |
| 1236 | 1295 | } |
| 1237 | 1296 | |
| 1238 | 1297 | break :blk .{ |
| ... | ... | @@ -1241,38 +1300,34 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1241 | 1300 | }; |
| 1242 | 1301 | }, |
| 1243 | 1302 | macho.S_ZEROFILL => { |
| 1244 | | if (mem.eql(u8, sectname, "__common")) { |
| 1245 | | if (self.common_section_index == null) { |
| 1246 | | self.common_section_index = @intCast(u16, data_seg.sections.items.len); |
| 1247 | | try data_seg.addSection(self.base.allocator, "__common", .{ |
| 1248 | | .flags = macho.S_ZEROFILL, |
| 1249 | | }); |
| 1250 | | } |
| 1251 | | |
| 1252 | | break :blk .{ |
| 1253 | | .seg = self.data_segment_cmd_index.?, |
| 1254 | | .sect = self.common_section_index.?, |
| 1255 | | }; |
| 1256 | | } else { |
| 1257 | | if (self.bss_section_index == null) { |
| 1258 | | self.bss_section_index = @intCast(u16, data_seg.sections.items.len); |
| 1259 | | try data_seg.addSection(self.base.allocator, "__bss", .{ |
| 1303 | if (self.bss_section_index == null) { |
| 1304 | self.bss_section_index = try self.allocateSection( |
| 1305 | self.data_segment_cmd_index.?, |
| 1306 | "__bss", |
| 1307 | sect.size, |
| 1308 | sect.@"align", |
| 1309 | .{ |
| 1260 | 1310 | .flags = macho.S_ZEROFILL, |
| 1261 | | }); |
| 1262 | | } |
| 1263 | | |
| 1264 | | break :blk .{ |
| 1265 | | .seg = self.data_segment_cmd_index.?, |
| 1266 | | .sect = self.bss_section_index.?, |
| 1267 | | }; |
| 1311 | }, |
| 1312 | ); |
| 1268 | 1313 | } |
| 1314 | |
| 1315 | break :blk .{ |
| 1316 | .seg = self.data_segment_cmd_index.?, |
| 1317 | .sect = self.bss_section_index.?, |
| 1318 | }; |
| 1269 | 1319 | }, |
| 1270 | 1320 | macho.S_THREAD_LOCAL_VARIABLES => { |
| 1271 | 1321 | if (self.tlv_section_index == null) { |
| 1272 | | self.tlv_section_index = @intCast(u16, data_seg.sections.items.len); |
| 1273 | | try data_seg.addSection(self.base.allocator, "__thread_vars", .{ |
| 1274 | | .flags = macho.S_THREAD_LOCAL_VARIABLES, |
| 1275 | | }); |
| 1322 | self.tlv_section_index = try self.allocateSection( |
| 1323 | self.data_segment_cmd_index.?, |
| 1324 | "__thread_vars", |
| 1325 | sect.size, |
| 1326 | sect.@"align", |
| 1327 | .{ |
| 1328 | .flags = macho.S_THREAD_LOCAL_VARIABLES, |
| 1329 | }, |
| 1330 | ); |
| 1276 | 1331 | } |
| 1277 | 1332 | |
| 1278 | 1333 | break :blk .{ |
| ... | ... | @@ -1282,10 +1337,15 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1282 | 1337 | }, |
| 1283 | 1338 | macho.S_THREAD_LOCAL_REGULAR => { |
| 1284 | 1339 | if (self.tlv_data_section_index == null) { |
| 1285 | | self.tlv_data_section_index = @intCast(u16, data_seg.sections.items.len); |
| 1286 | | try data_seg.addSection(self.base.allocator, "__thread_data", .{ |
| 1287 | | .flags = macho.S_THREAD_LOCAL_REGULAR, |
| 1288 | | }); |
| 1340 | self.tlv_data_section_index = try self.allocateSection( |
| 1341 | self.data_segment_cmd_index.?, |
| 1342 | "__thread_data", |
| 1343 | sect.size, |
| 1344 | sect.@"align", |
| 1345 | .{ |
| 1346 | .flags = macho.S_THREAD_LOCAL_REGULAR, |
| 1347 | }, |
| 1348 | ); |
| 1289 | 1349 | } |
| 1290 | 1350 | |
| 1291 | 1351 | break :blk .{ |
| ... | ... | @@ -1295,10 +1355,15 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1295 | 1355 | }, |
| 1296 | 1356 | macho.S_THREAD_LOCAL_ZEROFILL => { |
| 1297 | 1357 | if (self.tlv_bss_section_index == null) { |
| 1298 | | self.tlv_bss_section_index = @intCast(u16, data_seg.sections.items.len); |
| 1299 | | try data_seg.addSection(self.base.allocator, "__thread_bss", .{ |
| 1300 | | .flags = macho.S_THREAD_LOCAL_ZEROFILL, |
| 1301 | | }); |
| 1358 | self.tlv_bss_section_index = try self.allocateSection( |
| 1359 | self.data_segment_cmd_index.?, |
| 1360 | "__thread_bss", |
| 1361 | sect.size, |
| 1362 | sect.@"align", |
| 1363 | .{ |
| 1364 | .flags = macho.S_THREAD_LOCAL_ZEROFILL, |
| 1365 | }, |
| 1366 | ); |
| 1302 | 1367 | } |
| 1303 | 1368 | |
| 1304 | 1369 | break :blk .{ |
| ... | ... | @@ -1311,8 +1376,13 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1311 | 1376 | // TODO I believe __eh_frame is currently part of __unwind_info section |
| 1312 | 1377 | // in the latest ld64 output. |
| 1313 | 1378 | if (self.eh_frame_section_index == null) { |
| 1314 | | self.eh_frame_section_index = @intCast(u16, text_seg.sections.items.len); |
| 1315 | | try text_seg.addSection(self.base.allocator, "__eh_frame", .{}); |
| 1379 | self.eh_frame_section_index = try self.allocateSection( |
| 1380 | self.text_segment_cmd_index.?, |
| 1381 | "__eh_frame", |
| 1382 | sect.size, |
| 1383 | sect.@"align", |
| 1384 | .{}, |
| 1385 | ); |
| 1316 | 1386 | } |
| 1317 | 1387 | |
| 1318 | 1388 | break :blk .{ |
| ... | ... | @@ -1323,8 +1393,13 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1323 | 1393 | |
| 1324 | 1394 | // TODO audit this: is this the right mapping? |
| 1325 | 1395 | if (self.data_const_section_index == null) { |
| 1326 | | self.data_const_section_index = @intCast(u16, data_const_seg.sections.items.len); |
| 1327 | | try data_const_seg.addSection(self.base.allocator, "__const", .{}); |
| 1396 | self.data_const_section_index = try self.allocateSection( |
| 1397 | self.data_const_segment_cmd_index.?, |
| 1398 | "__const", |
| 1399 | sect.size, |
| 1400 | sect.@"align", |
| 1401 | .{}, |
| 1402 | ); |
| 1328 | 1403 | } |
| 1329 | 1404 | |
| 1330 | 1405 | break :blk .{ |
| ... | ... | @@ -1335,10 +1410,17 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1335 | 1410 | macho.S_REGULAR => { |
| 1336 | 1411 | if (commands.sectionIsCode(sect)) { |
| 1337 | 1412 | if (self.text_section_index == null) { |
| 1338 | | self.text_section_index = @intCast(u16, text_seg.sections.items.len); |
| 1339 | | try text_seg.addSection(self.base.allocator, "__text", .{ |
| 1340 | | .flags = macho.S_REGULAR | macho.S_ATTR_PURE_INSTRUCTIONS | macho.S_ATTR_SOME_INSTRUCTIONS, |
| 1341 | | }); |
| 1413 | self.text_section_index = try self.allocateSection( |
| 1414 | self.text_segment_cmd_index.?, |
| 1415 | "__text", |
| 1416 | sect.size, |
| 1417 | sect.@"align", |
| 1418 | .{ |
| 1419 | .flags = macho.S_REGULAR | |
| 1420 | macho.S_ATTR_PURE_INSTRUCTIONS | |
| 1421 | macho.S_ATTR_SOME_INSTRUCTIONS, |
| 1422 | }, |
| 1423 | ); |
| 1342 | 1424 | } |
| 1343 | 1425 | |
| 1344 | 1426 | break :blk .{ |
| ... | ... | @@ -1359,8 +1441,13 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1359 | 1441 | if (mem.eql(u8, segname, "__TEXT")) { |
| 1360 | 1442 | if (mem.eql(u8, sectname, "__ustring")) { |
| 1361 | 1443 | if (self.ustring_section_index == null) { |
| 1362 | | self.ustring_section_index = @intCast(u16, text_seg.sections.items.len); |
| 1363 | | try text_seg.addSection(self.base.allocator, "__ustring", .{}); |
| 1444 | self.ustring_section_index = try self.allocateSection( |
| 1445 | self.text_segment_cmd_index.?, |
| 1446 | "__ustring", |
| 1447 | sect.size, |
| 1448 | sect.@"align", |
| 1449 | .{}, |
| 1450 | ); |
| 1364 | 1451 | } |
| 1365 | 1452 | |
| 1366 | 1453 | break :blk .{ |
| ... | ... | @@ -1369,8 +1456,13 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1369 | 1456 | }; |
| 1370 | 1457 | } else if (mem.eql(u8, sectname, "__gcc_except_tab")) { |
| 1371 | 1458 | if (self.gcc_except_tab_section_index == null) { |
| 1372 | | self.gcc_except_tab_section_index = @intCast(u16, text_seg.sections.items.len); |
| 1373 | | try text_seg.addSection(self.base.allocator, "__gcc_except_tab", .{}); |
| 1459 | self.gcc_except_tab_section_index = try self.allocateSection( |
| 1460 | self.text_segment_cmd_index.?, |
| 1461 | "__gcc_except_tab", |
| 1462 | sect.size, |
| 1463 | sect.@"align", |
| 1464 | .{}, |
| 1465 | ); |
| 1374 | 1466 | } |
| 1375 | 1467 | |
| 1376 | 1468 | break :blk .{ |
| ... | ... | @@ -1379,8 +1471,13 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1379 | 1471 | }; |
| 1380 | 1472 | } else if (mem.eql(u8, sectname, "__objc_methlist")) { |
| 1381 | 1473 | if (self.objc_methlist_section_index == null) { |
| 1382 | | self.objc_methlist_section_index = @intCast(u16, text_seg.sections.items.len); |
| 1383 | | try text_seg.addSection(self.base.allocator, "__objc_methlist", .{}); |
| 1474 | self.objc_methlist_section_index = try self.allocateSection( |
| 1475 | self.text_segment_cmd_index.?, |
| 1476 | "__objc_methlist", |
| 1477 | sect.size, |
| 1478 | sect.@"align", |
| 1479 | .{}, |
| 1480 | ); |
| 1384 | 1481 | } |
| 1385 | 1482 | |
| 1386 | 1483 | break :blk .{ |
| ... | ... | @@ -1394,8 +1491,13 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1394 | 1491 | mem.eql(u8, sectname, "__gopclntab")) |
| 1395 | 1492 | { |
| 1396 | 1493 | if (self.data_const_section_index == null) { |
| 1397 | | self.data_const_section_index = @intCast(u16, data_const_seg.sections.items.len); |
| 1398 | | try data_const_seg.addSection(self.base.allocator, "__const", .{}); |
| 1494 | self.data_const_section_index = try self.allocateSection( |
| 1495 | self.data_const_segment_cmd_index.?, |
| 1496 | "__const", |
| 1497 | sect.size, |
| 1498 | sect.@"align", |
| 1499 | .{}, |
| 1500 | ); |
| 1399 | 1501 | } |
| 1400 | 1502 | |
| 1401 | 1503 | break :blk .{ |
| ... | ... | @@ -1404,8 +1506,13 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1404 | 1506 | }; |
| 1405 | 1507 | } else { |
| 1406 | 1508 | if (self.text_const_section_index == null) { |
| 1407 | | self.text_const_section_index = @intCast(u16, text_seg.sections.items.len); |
| 1408 | | try text_seg.addSection(self.base.allocator, "__const", .{}); |
| 1509 | self.text_const_section_index = try self.allocateSection( |
| 1510 | self.text_segment_cmd_index.?, |
| 1511 | "__const", |
| 1512 | sect.size, |
| 1513 | sect.@"align", |
| 1514 | .{}, |
| 1515 | ); |
| 1409 | 1516 | } |
| 1410 | 1517 | |
| 1411 | 1518 | break :blk .{ |
| ... | ... | @@ -1417,8 +1524,13 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1417 | 1524 | |
| 1418 | 1525 | if (mem.eql(u8, segname, "__DATA_CONST")) { |
| 1419 | 1526 | if (self.data_const_section_index == null) { |
| 1420 | | self.data_const_section_index = @intCast(u16, data_const_seg.sections.items.len); |
| 1421 | | try data_const_seg.addSection(self.base.allocator, "__const", .{}); |
| 1527 | self.data_const_section_index = try self.allocateSection( |
| 1528 | self.data_const_segment_cmd_index.?, |
| 1529 | "__const", |
| 1530 | sect.size, |
| 1531 | sect.@"align", |
| 1532 | .{}, |
| 1533 | ); |
| 1422 | 1534 | } |
| 1423 | 1535 | |
| 1424 | 1536 | break :blk .{ |
| ... | ... | @@ -1430,8 +1542,13 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1430 | 1542 | if (mem.eql(u8, segname, "__DATA")) { |
| 1431 | 1543 | if (mem.eql(u8, sectname, "__const")) { |
| 1432 | 1544 | if (self.data_const_section_index == null) { |
| 1433 | | self.data_const_section_index = @intCast(u16, data_const_seg.sections.items.len); |
| 1434 | | try data_const_seg.addSection(self.base.allocator, "__const", .{}); |
| 1545 | self.data_const_section_index = try self.allocateSection( |
| 1546 | self.data_const_segment_cmd_index.?, |
| 1547 | "__const", |
| 1548 | sect.size, |
| 1549 | sect.@"align", |
| 1550 | .{}, |
| 1551 | ); |
| 1435 | 1552 | } |
| 1436 | 1553 | |
| 1437 | 1554 | break :blk .{ |
| ... | ... | @@ -1440,8 +1557,13 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1440 | 1557 | }; |
| 1441 | 1558 | } else if (mem.eql(u8, sectname, "__cfstring")) { |
| 1442 | 1559 | if (self.objc_cfstring_section_index == null) { |
| 1443 | | self.objc_cfstring_section_index = @intCast(u16, data_const_seg.sections.items.len); |
| 1444 | | try data_const_seg.addSection(self.base.allocator, "__cfstring", .{}); |
| 1560 | self.objc_cfstring_section_index = try self.allocateSection( |
| 1561 | self.data_const_segment_cmd_index.?, |
| 1562 | "__cfstring", |
| 1563 | sect.size, |
| 1564 | sect.@"align", |
| 1565 | .{}, |
| 1566 | ); |
| 1445 | 1567 | } |
| 1446 | 1568 | |
| 1447 | 1569 | break :blk .{ |
| ... | ... | @@ -1450,8 +1572,13 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1450 | 1572 | }; |
| 1451 | 1573 | } else if (mem.eql(u8, sectname, "__objc_classlist")) { |
| 1452 | 1574 | if (self.objc_classlist_section_index == null) { |
| 1453 | | self.objc_classlist_section_index = @intCast(u16, data_const_seg.sections.items.len); |
| 1454 | | try data_const_seg.addSection(self.base.allocator, "__objc_classlist", .{}); |
| 1575 | self.objc_classlist_section_index = try self.allocateSection( |
| 1576 | self.data_const_segment_cmd_index.?, |
| 1577 | "__objc_classlist", |
| 1578 | sect.size, |
| 1579 | sect.@"align", |
| 1580 | .{}, |
| 1581 | ); |
| 1455 | 1582 | } |
| 1456 | 1583 | |
| 1457 | 1584 | break :blk .{ |
| ... | ... | @@ -1460,8 +1587,13 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1460 | 1587 | }; |
| 1461 | 1588 | } else if (mem.eql(u8, sectname, "__objc_imageinfo")) { |
| 1462 | 1589 | if (self.objc_imageinfo_section_index == null) { |
| 1463 | | self.objc_imageinfo_section_index = @intCast(u16, data_const_seg.sections.items.len); |
| 1464 | | try data_const_seg.addSection(self.base.allocator, "__objc_imageinfo", .{}); |
| 1590 | self.objc_imageinfo_section_index = try self.allocateSection( |
| 1591 | self.data_const_segment_cmd_index.?, |
| 1592 | "__objc_imageinfo", |
| 1593 | sect.size, |
| 1594 | sect.@"align", |
| 1595 | .{}, |
| 1596 | ); |
| 1465 | 1597 | } |
| 1466 | 1598 | |
| 1467 | 1599 | break :blk .{ |
| ... | ... | @@ -1470,8 +1602,13 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1470 | 1602 | }; |
| 1471 | 1603 | } else if (mem.eql(u8, sectname, "__objc_const")) { |
| 1472 | 1604 | if (self.objc_const_section_index == null) { |
| 1473 | | self.objc_const_section_index = @intCast(u16, data_seg.sections.items.len); |
| 1474 | | try data_seg.addSection(self.base.allocator, "__objc_const", .{}); |
| 1605 | self.objc_const_section_index = try self.allocateSection( |
| 1606 | self.data_segment_cmd_index.?, |
| 1607 | "__objc_const", |
| 1608 | sect.size, |
| 1609 | sect.@"align", |
| 1610 | .{}, |
| 1611 | ); |
| 1475 | 1612 | } |
| 1476 | 1613 | |
| 1477 | 1614 | break :blk .{ |
| ... | ... | @@ -1480,8 +1617,13 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1480 | 1617 | }; |
| 1481 | 1618 | } else if (mem.eql(u8, sectname, "__objc_classrefs")) { |
| 1482 | 1619 | if (self.objc_classrefs_section_index == null) { |
| 1483 | | self.objc_classrefs_section_index = @intCast(u16, data_seg.sections.items.len); |
| 1484 | | try data_seg.addSection(self.base.allocator, "__objc_classrefs", .{}); |
| 1620 | self.objc_classrefs_section_index = try self.allocateSection( |
| 1621 | self.data_segment_cmd_index.?, |
| 1622 | "__objc_classrefs", |
| 1623 | sect.size, |
| 1624 | sect.@"align", |
| 1625 | .{}, |
| 1626 | ); |
| 1485 | 1627 | } |
| 1486 | 1628 | |
| 1487 | 1629 | break :blk .{ |
| ... | ... | @@ -1490,8 +1632,13 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1490 | 1632 | }; |
| 1491 | 1633 | } else if (mem.eql(u8, sectname, "__objc_data")) { |
| 1492 | 1634 | if (self.objc_data_section_index == null) { |
| 1493 | | self.objc_data_section_index = @intCast(u16, data_seg.sections.items.len); |
| 1494 | | try data_seg.addSection(self.base.allocator, "__objc_data", .{}); |
| 1635 | self.objc_data_section_index = try self.allocateSection( |
| 1636 | self.data_segment_cmd_index.?, |
| 1637 | "__objc_data", |
| 1638 | sect.size, |
| 1639 | sect.@"align", |
| 1640 | .{}, |
| 1641 | ); |
| 1495 | 1642 | } |
| 1496 | 1643 | |
| 1497 | 1644 | break :blk .{ |
| ... | ... | @@ -1500,8 +1647,13 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1500 | 1647 | }; |
| 1501 | 1648 | } else { |
| 1502 | 1649 | if (self.data_section_index == null) { |
| 1503 | | self.data_section_index = @intCast(u16, data_seg.sections.items.len); |
| 1504 | | try data_seg.addSection(self.base.allocator, "__data", .{}); |
| 1650 | self.data_section_index = try self.allocateSection( |
| 1651 | self.data_segment_cmd_index.?, |
| 1652 | "__data", |
| 1653 | sect.size, |
| 1654 | sect.@"align", |
| 1655 | .{}, |
| 1656 | ); |
| 1505 | 1657 | } |
| 1506 | 1658 | |
| 1507 | 1659 | break :blk .{ |
| ... | ... | @@ -1522,563 +1674,605 @@ pub fn getMatchingSection(self: *MachO, sect: macho.section_64) !?MatchingSectio |
| 1522 | 1674 | else => break :blk null, |
| 1523 | 1675 | } |
| 1524 | 1676 | }; |
| 1525 | | |
| 1526 | | if (res) |match| { |
| 1527 | | _ = try self.section_ordinals.getOrPut(self.base.allocator, match); |
| 1528 | | } |
| 1529 | | |
| 1530 | 1677 | return res; |
| 1531 | 1678 | } |
| 1532 | 1679 | |
| 1533 | | fn sortSections(self: *MachO) !void { |
| 1534 | | var text_index_mapping = std.AutoHashMap(u16, u16).init(self.base.allocator); |
| 1535 | | defer text_index_mapping.deinit(); |
| 1536 | | var data_const_index_mapping = std.AutoHashMap(u16, u16).init(self.base.allocator); |
| 1537 | | defer data_const_index_mapping.deinit(); |
| 1538 | | var data_index_mapping = std.AutoHashMap(u16, u16).init(self.base.allocator); |
| 1539 | | defer data_index_mapping.deinit(); |
| 1540 | | |
| 1541 | | { |
| 1542 | | // __TEXT segment |
| 1543 | | const seg = &self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 1544 | | var sections = seg.sections.toOwnedSlice(self.base.allocator); |
| 1545 | | defer self.base.allocator.free(sections); |
| 1546 | | try seg.sections.ensureCapacity(self.base.allocator, sections.len); |
| 1547 | | |
| 1548 | | const indices = &[_]*?u16{ |
| 1549 | | &self.text_section_index, |
| 1550 | | &self.stubs_section_index, |
| 1551 | | &self.stub_helper_section_index, |
| 1552 | | &self.gcc_except_tab_section_index, |
| 1553 | | &self.cstring_section_index, |
| 1554 | | &self.ustring_section_index, |
| 1555 | | &self.text_const_section_index, |
| 1556 | | &self.objc_methlist_section_index, |
| 1557 | | &self.objc_methname_section_index, |
| 1558 | | &self.objc_methtype_section_index, |
| 1559 | | &self.objc_classname_section_index, |
| 1560 | | &self.eh_frame_section_index, |
| 1561 | | }; |
| 1562 | | for (indices) |maybe_index| { |
| 1563 | | const new_index: u16 = if (maybe_index.*) |index| blk: { |
| 1564 | | const idx = @intCast(u16, seg.sections.items.len); |
| 1565 | | seg.sections.appendAssumeCapacity(sections[index]); |
| 1566 | | try text_index_mapping.putNoClobber(index, idx); |
| 1567 | | break :blk idx; |
| 1568 | | } else continue; |
| 1569 | | maybe_index.* = new_index; |
| 1570 | | } |
| 1571 | | } |
| 1680 | pub fn createEmptyAtom(self: *MachO, local_sym_index: u32, size: u64, alignment: u32) !*Atom { |
| 1681 | const code = try self.base.allocator.alloc(u8, size); |
| 1682 | defer self.base.allocator.free(code); |
| 1683 | mem.set(u8, code, 0); |
| 1684 | |
| 1685 | const atom = try self.base.allocator.create(Atom); |
| 1686 | errdefer self.base.allocator.destroy(atom); |
| 1687 | atom.* = Atom.empty; |
| 1688 | atom.local_sym_index = local_sym_index; |
| 1689 | atom.size = size; |
| 1690 | atom.alignment = alignment; |
| 1691 | try atom.code.appendSlice(self.base.allocator, code); |
| 1692 | try self.managed_atoms.append(self.base.allocator, atom); |
| 1693 | |
| 1694 | return atom; |
| 1695 | } |
| 1572 | 1696 | |
| 1573 | | { |
| 1574 | | // __DATA_CONST segment |
| 1575 | | const seg = &self.load_commands.items[self.data_const_segment_cmd_index.?].Segment; |
| 1576 | | var sections = seg.sections.toOwnedSlice(self.base.allocator); |
| 1577 | | defer self.base.allocator.free(sections); |
| 1578 | | try seg.sections.ensureCapacity(self.base.allocator, sections.len); |
| 1579 | | |
| 1580 | | const indices = &[_]*?u16{ |
| 1581 | | &self.got_section_index, |
| 1582 | | &self.mod_init_func_section_index, |
| 1583 | | &self.mod_term_func_section_index, |
| 1584 | | &self.data_const_section_index, |
| 1585 | | &self.objc_cfstring_section_index, |
| 1586 | | &self.objc_classlist_section_index, |
| 1587 | | &self.objc_imageinfo_section_index, |
| 1588 | | }; |
| 1589 | | for (indices) |maybe_index| { |
| 1590 | | const new_index: u16 = if (maybe_index.*) |index| blk: { |
| 1591 | | const idx = @intCast(u16, seg.sections.items.len); |
| 1592 | | seg.sections.appendAssumeCapacity(sections[index]); |
| 1593 | | try data_const_index_mapping.putNoClobber(index, idx); |
| 1594 | | break :blk idx; |
| 1595 | | } else continue; |
| 1596 | | maybe_index.* = new_index; |
| 1597 | | } |
| 1598 | | } |
| 1697 | pub fn writeAtom(self: *MachO, atom: *Atom, match: MatchingSection) !void { |
| 1698 | const seg = self.load_commands.items[match.seg].Segment; |
| 1699 | const sect = seg.sections.items[match.sect]; |
| 1700 | const sym = self.locals.items[atom.local_sym_index]; |
| 1701 | const file_offset = sect.offset + sym.n_value - sect.addr; |
| 1702 | try atom.resolveRelocs(self); |
| 1703 | log.debug("writing atom for symbol {s} at file offset 0x{x}", .{ self.getString(sym.n_strx), file_offset }); |
| 1704 | try self.base.file.?.pwriteAll(atom.code.items, file_offset); |
| 1705 | } |
| 1599 | 1706 | |
| 1600 | | { |
| 1601 | | // __DATA segment |
| 1602 | | const seg = &self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 1603 | | var sections = seg.sections.toOwnedSlice(self.base.allocator); |
| 1604 | | defer self.base.allocator.free(sections); |
| 1605 | | try seg.sections.ensureCapacity(self.base.allocator, sections.len); |
| 1606 | | |
| 1607 | | // __DATA segment |
| 1608 | | const indices = &[_]*?u16{ |
| 1609 | | &self.la_symbol_ptr_section_index, |
| 1610 | | &self.objc_const_section_index, |
| 1611 | | &self.objc_selrefs_section_index, |
| 1612 | | &self.objc_classrefs_section_index, |
| 1613 | | &self.objc_data_section_index, |
| 1614 | | &self.data_section_index, |
| 1615 | | &self.tlv_section_index, |
| 1616 | | &self.tlv_data_section_index, |
| 1617 | | &self.tlv_bss_section_index, |
| 1618 | | &self.bss_section_index, |
| 1619 | | &self.common_section_index, |
| 1620 | | }; |
| 1621 | | for (indices) |maybe_index| { |
| 1622 | | const new_index: u16 = if (maybe_index.*) |index| blk: { |
| 1623 | | const idx = @intCast(u16, seg.sections.items.len); |
| 1624 | | seg.sections.appendAssumeCapacity(sections[index]); |
| 1625 | | try data_index_mapping.putNoClobber(index, idx); |
| 1626 | | break :blk idx; |
| 1627 | | } else continue; |
| 1628 | | maybe_index.* = new_index; |
| 1629 | | } |
| 1630 | | } |
| 1707 | fn allocateLocalSymbols(self: *MachO, match: MatchingSection, offset: i64) !void { |
| 1708 | var atom = self.atoms.get(match) orelse return; |
| 1631 | 1709 | |
| 1632 | | { |
| 1633 | | var transient: std.AutoHashMapUnmanaged(MatchingSection, *TextBlock) = .{}; |
| 1634 | | try transient.ensureCapacity(self.base.allocator, self.blocks.count()); |
| 1710 | while (true) { |
| 1711 | const atom_sym = &self.locals.items[atom.local_sym_index]; |
| 1712 | atom_sym.n_value = @intCast(u64, @intCast(i64, atom_sym.n_value) + offset); |
| 1635 | 1713 | |
| 1636 | | var it = self.blocks.iterator(); |
| 1637 | | while (it.next()) |entry| { |
| 1638 | | const old = entry.key_ptr.*; |
| 1639 | | const sect = if (old.seg == self.text_segment_cmd_index.?) |
| 1640 | | text_index_mapping.get(old.sect).? |
| 1641 | | else if (old.seg == self.data_const_segment_cmd_index.?) |
| 1642 | | data_const_index_mapping.get(old.sect).? |
| 1643 | | else |
| 1644 | | data_index_mapping.get(old.sect).?; |
| 1645 | | transient.putAssumeCapacityNoClobber(.{ |
| 1646 | | .seg = old.seg, |
| 1647 | | .sect = sect, |
| 1648 | | }, entry.value_ptr.*); |
| 1714 | for (atom.aliases.items) |index| { |
| 1715 | const alias_sym = &self.locals.items[index]; |
| 1716 | alias_sym.n_value = @intCast(u64, @intCast(i64, alias_sym.n_value) + offset); |
| 1649 | 1717 | } |
| 1650 | 1718 | |
| 1651 | | self.blocks.clearAndFree(self.base.allocator); |
| 1652 | | self.blocks.deinit(self.base.allocator); |
| 1653 | | self.blocks = transient; |
| 1654 | | } |
| 1655 | | |
| 1656 | | { |
| 1657 | | // Create new section ordinals. |
| 1658 | | self.section_ordinals.clearRetainingCapacity(); |
| 1659 | | const text_seg = self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 1660 | | for (text_seg.sections.items) |_, sect_id| { |
| 1661 | | const res = self.section_ordinals.getOrPutAssumeCapacity(.{ |
| 1662 | | .seg = self.text_segment_cmd_index.?, |
| 1663 | | .sect = @intCast(u16, sect_id), |
| 1664 | | }); |
| 1665 | | assert(!res.found_existing); |
| 1666 | | } |
| 1667 | | const data_const_seg = self.load_commands.items[self.data_const_segment_cmd_index.?].Segment; |
| 1668 | | for (data_const_seg.sections.items) |_, sect_id| { |
| 1669 | | const res = self.section_ordinals.getOrPutAssumeCapacity(.{ |
| 1670 | | .seg = self.data_const_segment_cmd_index.?, |
| 1671 | | .sect = @intCast(u16, sect_id), |
| 1672 | | }); |
| 1673 | | assert(!res.found_existing); |
| 1674 | | } |
| 1675 | | const data_seg = self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 1676 | | for (data_seg.sections.items) |_, sect_id| { |
| 1677 | | const res = self.section_ordinals.getOrPutAssumeCapacity(.{ |
| 1678 | | .seg = self.data_segment_cmd_index.?, |
| 1679 | | .sect = @intCast(u16, sect_id), |
| 1680 | | }); |
| 1681 | | assert(!res.found_existing); |
| 1719 | for (atom.contained.items) |sym_at_off| { |
| 1720 | const contained_sym = &self.locals.items[sym_at_off.local_sym_index]; |
| 1721 | contained_sym.n_value = @intCast(u64, @intCast(i64, contained_sym.n_value) + offset); |
| 1682 | 1722 | } |
| 1723 | |
| 1724 | if (atom.prev) |prev| { |
| 1725 | atom = prev; |
| 1726 | } else break; |
| 1683 | 1727 | } |
| 1684 | 1728 | } |
| 1685 | 1729 | |
| 1686 | | fn allocateTextSegment(self: *MachO) !void { |
| 1687 | | const seg = &self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 1688 | | const nstubs = @intCast(u32, self.stubs.items.len); |
| 1730 | fn allocateGlobalSymbols(self: *MachO) !void { |
| 1731 | var sym_it = self.symbol_resolver.valueIterator(); |
| 1732 | while (sym_it.next()) |resolv| { |
| 1733 | if (resolv.where != .global) continue; |
| 1689 | 1734 | |
| 1690 | | const base_vmaddr = self.load_commands.items[self.pagezero_segment_cmd_index.?].Segment.inner.vmsize; |
| 1691 | | seg.inner.fileoff = 0; |
| 1692 | | seg.inner.vmaddr = base_vmaddr; |
| 1735 | assert(resolv.local_sym_index != 0); |
| 1736 | const local_sym = self.locals.items[resolv.local_sym_index]; |
| 1737 | const sym = &self.globals.items[resolv.where_index]; |
| 1738 | sym.n_value = local_sym.n_value; |
| 1739 | sym.n_sect = local_sym.n_sect; |
| 1740 | log.debug("allocating global symbol {s} at 0x{x}", .{ self.getString(sym.n_strx), local_sym.n_value }); |
| 1741 | } |
| 1742 | } |
| 1693 | 1743 | |
| 1694 | | // Set stubs and stub_helper sizes |
| 1695 | | const stubs = &seg.sections.items[self.stubs_section_index.?]; |
| 1696 | | const stub_helper = &seg.sections.items[self.stub_helper_section_index.?]; |
| 1697 | | stubs.size += nstubs * stubs.reserved2; |
| 1744 | fn writeAtoms(self: *MachO) !void { |
| 1745 | var buffer = std.ArrayList(u8).init(self.base.allocator); |
| 1746 | defer buffer.deinit(); |
| 1747 | var file_offset: ?u64 = null; |
| 1698 | 1748 | |
| 1699 | | const stub_size: u4 = switch (self.base.options.target.cpu.arch) { |
| 1700 | | .x86_64 => 10, |
| 1701 | | .aarch64 => 3 * @sizeOf(u32), |
| 1702 | | else => unreachable, |
| 1703 | | }; |
| 1704 | | stub_helper.size += nstubs * stub_size; |
| 1749 | var it = self.atoms.iterator(); |
| 1750 | while (it.next()) |entry| { |
| 1751 | const match = entry.key_ptr.*; |
| 1752 | const seg = self.load_commands.items[match.seg].Segment; |
| 1753 | const sect = seg.sections.items[match.sect]; |
| 1754 | var atom: *Atom = entry.value_ptr.*; |
| 1705 | 1755 | |
| 1706 | | var sizeofcmds: u64 = 0; |
| 1707 | | for (self.load_commands.items) |lc| { |
| 1708 | | sizeofcmds += lc.cmdsize(); |
| 1709 | | } |
| 1756 | log.debug("writing atoms in {s},{s}", .{ commands.segmentName(sect), commands.sectionName(sect) }); |
| 1710 | 1757 | |
| 1711 | | try self.allocateSegment(self.text_segment_cmd_index.?, @sizeOf(macho.mach_header_64) + sizeofcmds); |
| 1758 | while (atom.prev) |prev| { |
| 1759 | atom = prev; |
| 1760 | } |
| 1712 | 1761 | |
| 1713 | | // Shift all sections to the back to minimize jump size between __TEXT and __DATA segments. |
| 1714 | | var min_alignment: u32 = 0; |
| 1715 | | for (seg.sections.items) |sect| { |
| 1716 | | const alignment = try math.powi(u32, 2, sect.@"align"); |
| 1717 | | min_alignment = math.max(min_alignment, alignment); |
| 1718 | | } |
| 1762 | while (true) { |
| 1763 | if (atom.dirty) { |
| 1764 | const atom_sym = self.locals.items[atom.local_sym_index]; |
| 1765 | const padding_size: u64 = if (atom.next) |next| blk: { |
| 1766 | const next_sym = self.locals.items[next.local_sym_index]; |
| 1767 | break :blk next_sym.n_value - (atom_sym.n_value + atom.size); |
| 1768 | } else 0; |
| 1769 | |
| 1770 | log.debug(" (adding atom {s} to buffer: {})", .{ self.getString(atom_sym.n_strx), atom_sym }); |
| 1771 | |
| 1772 | try atom.resolveRelocs(self); |
| 1773 | try buffer.appendSlice(atom.code.items); |
| 1774 | try buffer.ensureUnusedCapacity(padding_size); |
| 1775 | |
| 1776 | var i: usize = 0; |
| 1777 | while (i < padding_size) : (i += 1) { |
| 1778 | buffer.appendAssumeCapacity(0); |
| 1779 | } |
| 1719 | 1780 | |
| 1720 | | assert(min_alignment > 0); |
| 1721 | | const last_sect_idx = seg.sections.items.len - 1; |
| 1722 | | const last_sect = seg.sections.items[last_sect_idx]; |
| 1723 | | const shift: u32 = blk: { |
| 1724 | | const diff = seg.inner.filesize - last_sect.offset - last_sect.size; |
| 1725 | | const factor = @divTrunc(diff, min_alignment); |
| 1726 | | break :blk @intCast(u32, factor * min_alignment); |
| 1727 | | }; |
| 1781 | if (file_offset == null) { |
| 1782 | file_offset = sect.offset + atom_sym.n_value - sect.addr; |
| 1783 | } |
| 1784 | atom.dirty = false; |
| 1785 | } else { |
| 1786 | if (file_offset) |off| { |
| 1787 | try self.base.file.?.pwriteAll(buffer.items, off); |
| 1788 | } |
| 1789 | file_offset = null; |
| 1790 | buffer.clearRetainingCapacity(); |
| 1791 | } |
| 1728 | 1792 | |
| 1729 | | if (shift > 0) { |
| 1730 | | for (seg.sections.items) |*sect| { |
| 1731 | | sect.offset += shift; |
| 1732 | | sect.addr += shift; |
| 1793 | if (atom.next) |next| { |
| 1794 | atom = next; |
| 1795 | } else { |
| 1796 | if (file_offset) |off| { |
| 1797 | try self.base.file.?.pwriteAll(buffer.items, off); |
| 1798 | } |
| 1799 | file_offset = null; |
| 1800 | buffer.clearRetainingCapacity(); |
| 1801 | break; |
| 1802 | } |
| 1733 | 1803 | } |
| 1734 | 1804 | } |
| 1735 | 1805 | } |
| 1736 | 1806 | |
| 1737 | | fn allocateDataConstSegment(self: *MachO) !void { |
| 1738 | | const seg = &self.load_commands.items[self.data_const_segment_cmd_index.?].Segment; |
| 1739 | | const nentries = @intCast(u32, self.got_entries.items.len); |
| 1740 | | |
| 1741 | | const text_seg = self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 1742 | | seg.inner.fileoff = text_seg.inner.fileoff + text_seg.inner.filesize; |
| 1743 | | seg.inner.vmaddr = text_seg.inner.vmaddr + text_seg.inner.vmsize; |
| 1807 | pub fn createGotAtom(self: *MachO, key: GotIndirectionKey) !*Atom { |
| 1808 | const local_sym_index = @intCast(u32, self.locals.items.len); |
| 1809 | try self.locals.append(self.base.allocator, .{ |
| 1810 | .n_strx = try self.makeString("l_zld_got_entry"), |
| 1811 | .n_type = macho.N_SECT, |
| 1812 | .n_sect = 0, |
| 1813 | .n_desc = 0, |
| 1814 | .n_value = 0, |
| 1815 | }); |
| 1816 | const atom = try self.createEmptyAtom(local_sym_index, @sizeOf(u64), 3); |
| 1817 | switch (key.where) { |
| 1818 | .local => { |
| 1819 | try atom.relocs.append(self.base.allocator, .{ |
| 1820 | .offset = 0, |
| 1821 | .where = .local, |
| 1822 | .where_index = key.where_index, |
| 1823 | .payload = .{ |
| 1824 | .unsigned = .{ |
| 1825 | .subtractor = null, |
| 1826 | .addend = 0, |
| 1827 | .is_64bit = true, |
| 1828 | }, |
| 1829 | }, |
| 1830 | }); |
| 1831 | try atom.rebases.append(self.base.allocator, 0); |
| 1832 | }, |
| 1833 | .undef => { |
| 1834 | try atom.bindings.append(self.base.allocator, .{ |
| 1835 | .local_sym_index = key.where_index, |
| 1836 | .offset = 0, |
| 1837 | }); |
| 1838 | }, |
| 1839 | } |
| 1840 | return atom; |
| 1841 | } |
| 1744 | 1842 | |
| 1745 | | // Set got size |
| 1746 | | const got = &seg.sections.items[self.got_section_index.?]; |
| 1747 | | got.size += nentries * @sizeOf(u64); |
| 1748 | | |
| 1749 | | try self.allocateSegment(self.data_const_segment_cmd_index.?, 0); |
| 1750 | | } |
| 1751 | | |
| 1752 | | fn allocateDataSegment(self: *MachO) !void { |
| 1753 | | const seg = &self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 1754 | | const nstubs = @intCast(u32, self.stubs.items.len); |
| 1755 | | |
| 1756 | | const data_const_seg = self.load_commands.items[self.data_const_segment_cmd_index.?].Segment; |
| 1757 | | seg.inner.fileoff = data_const_seg.inner.fileoff + data_const_seg.inner.filesize; |
| 1758 | | seg.inner.vmaddr = data_const_seg.inner.vmaddr + data_const_seg.inner.vmsize; |
| 1759 | | |
| 1760 | | // Set la_symbol_ptr and data size |
| 1761 | | const la_symbol_ptr = &seg.sections.items[self.la_symbol_ptr_section_index.?]; |
| 1762 | | const data = &seg.sections.items[self.data_section_index.?]; |
| 1763 | | la_symbol_ptr.size += nstubs * @sizeOf(u64); |
| 1764 | | data.size += @sizeOf(u64); // We need at least 8bytes for address of dyld_stub_binder |
| 1765 | | |
| 1766 | | try self.allocateSegment(self.data_segment_cmd_index.?, 0); |
| 1843 | fn createDyldPrivateAtom(self: *MachO) !void { |
| 1844 | if (self.dyld_private_atom != null) return; |
| 1845 | const local_sym_index = @intCast(u32, self.locals.items.len); |
| 1846 | const sym = try self.locals.addOne(self.base.allocator); |
| 1847 | sym.* = .{ |
| 1848 | .n_strx = try self.makeString("l_zld_dyld_private"), |
| 1849 | .n_type = macho.N_SECT, |
| 1850 | .n_sect = 0, |
| 1851 | .n_desc = 0, |
| 1852 | .n_value = 0, |
| 1853 | }; |
| 1854 | const atom = try self.createEmptyAtom(local_sym_index, @sizeOf(u64), 3); |
| 1855 | self.dyld_private_atom = atom; |
| 1856 | const match = MatchingSection{ |
| 1857 | .seg = self.data_segment_cmd_index.?, |
| 1858 | .sect = self.data_section_index.?, |
| 1859 | }; |
| 1860 | const vaddr = try self.allocateAtom(atom, @sizeOf(u64), 8, match); |
| 1861 | sym.n_value = vaddr; |
| 1862 | sym.n_sect = @intCast(u8, self.section_ordinals.getIndex(match).? + 1); |
| 1863 | log.debug("allocated {s} atom at 0x{x}", .{ self.getString(sym.n_strx), vaddr }); |
| 1767 | 1864 | } |
| 1768 | 1865 | |
| 1769 | | fn allocateLinkeditSegment(self: *MachO) void { |
| 1770 | | const seg = &self.load_commands.items[self.linkedit_segment_cmd_index.?].Segment; |
| 1771 | | const data_seg = self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 1772 | | seg.inner.fileoff = data_seg.inner.fileoff + data_seg.inner.filesize; |
| 1773 | | seg.inner.vmaddr = data_seg.inner.vmaddr + data_seg.inner.vmsize; |
| 1866 | fn createStubHelperPreambleAtom(self: *MachO) !void { |
| 1867 | if (self.stub_helper_preamble_atom != null) return; |
| 1868 | const arch = self.base.options.target.cpu.arch; |
| 1869 | const size: u64 = switch (arch) { |
| 1870 | .x86_64 => 15, |
| 1871 | .aarch64 => 6 * @sizeOf(u32), |
| 1872 | else => unreachable, |
| 1873 | }; |
| 1874 | const alignment: u32 = switch (arch) { |
| 1875 | .x86_64 => 0, |
| 1876 | .aarch64 => 2, |
| 1877 | else => unreachable, |
| 1878 | }; |
| 1879 | const local_sym_index = @intCast(u32, self.locals.items.len); |
| 1880 | const sym = try self.locals.addOne(self.base.allocator); |
| 1881 | sym.* = .{ |
| 1882 | .n_strx = try self.makeString("l_zld_stub_preamble"), |
| 1883 | .n_type = macho.N_SECT, |
| 1884 | .n_sect = 0, |
| 1885 | .n_desc = 0, |
| 1886 | .n_value = 0, |
| 1887 | }; |
| 1888 | const atom = try self.createEmptyAtom(local_sym_index, size, alignment); |
| 1889 | const dyld_private_sym_index = self.dyld_private_atom.?.local_sym_index; |
| 1890 | switch (arch) { |
| 1891 | .x86_64 => { |
| 1892 | try atom.relocs.ensureUnusedCapacity(self.base.allocator, 2); |
| 1893 | // lea %r11, [rip + disp] |
| 1894 | atom.code.items[0] = 0x4c; |
| 1895 | atom.code.items[1] = 0x8d; |
| 1896 | atom.code.items[2] = 0x1d; |
| 1897 | atom.relocs.appendAssumeCapacity(.{ |
| 1898 | .offset = 3, |
| 1899 | .where = .local, |
| 1900 | .where_index = dyld_private_sym_index, |
| 1901 | .payload = .{ |
| 1902 | .signed = .{ |
| 1903 | .addend = 0, |
| 1904 | .correction = 0, |
| 1905 | }, |
| 1906 | }, |
| 1907 | }); |
| 1908 | // push %r11 |
| 1909 | atom.code.items[7] = 0x41; |
| 1910 | atom.code.items[8] = 0x53; |
| 1911 | // jmp [rip + disp] |
| 1912 | atom.code.items[9] = 0xff; |
| 1913 | atom.code.items[10] = 0x25; |
| 1914 | atom.relocs.appendAssumeCapacity(.{ |
| 1915 | .offset = 11, |
| 1916 | .where = .undef, |
| 1917 | .where_index = self.dyld_stub_binder_index.?, |
| 1918 | .payload = .{ |
| 1919 | .load = .{ |
| 1920 | .kind = .got, |
| 1921 | .addend = 0, |
| 1922 | }, |
| 1923 | }, |
| 1924 | }); |
| 1925 | }, |
| 1926 | .aarch64 => { |
| 1927 | try atom.relocs.ensureUnusedCapacity(self.base.allocator, 4); |
| 1928 | // adrp x17, 0 |
| 1929 | mem.writeIntLittle(u32, atom.code.items[0..][0..4], aarch64.Instruction.adrp(.x17, 0).toU32()); |
| 1930 | atom.relocs.appendAssumeCapacity(.{ |
| 1931 | .offset = 0, |
| 1932 | .where = .local, |
| 1933 | .where_index = dyld_private_sym_index, |
| 1934 | .payload = .{ |
| 1935 | .page = .{ |
| 1936 | .kind = .page, |
| 1937 | .addend = 0, |
| 1938 | }, |
| 1939 | }, |
| 1940 | }); |
| 1941 | // add x17, x17, 0 |
| 1942 | mem.writeIntLittle(u32, atom.code.items[4..][0..4], aarch64.Instruction.add(.x17, .x17, 0, false).toU32()); |
| 1943 | atom.relocs.appendAssumeCapacity(.{ |
| 1944 | .offset = 4, |
| 1945 | .where = .local, |
| 1946 | .where_index = dyld_private_sym_index, |
| 1947 | .payload = .{ |
| 1948 | .page_off = .{ |
| 1949 | .kind = .page, |
| 1950 | .addend = 0, |
| 1951 | .op_kind = .arithmetic, |
| 1952 | }, |
| 1953 | }, |
| 1954 | }); |
| 1955 | // stp x16, x17, [sp, #-16]! |
| 1956 | mem.writeIntLittle(u32, atom.code.items[8..][0..4], aarch64.Instruction.stp( |
| 1957 | .x16, |
| 1958 | .x17, |
| 1959 | aarch64.Register.sp, |
| 1960 | aarch64.Instruction.LoadStorePairOffset.pre_index(-16), |
| 1961 | ).toU32()); |
| 1962 | // adrp x16, 0 |
| 1963 | mem.writeIntLittle(u32, atom.code.items[12..][0..4], aarch64.Instruction.adrp(.x16, 0).toU32()); |
| 1964 | atom.relocs.appendAssumeCapacity(.{ |
| 1965 | .offset = 12, |
| 1966 | .where = .undef, |
| 1967 | .where_index = self.dyld_stub_binder_index.?, |
| 1968 | .payload = .{ |
| 1969 | .page = .{ |
| 1970 | .kind = .got, |
| 1971 | .addend = 0, |
| 1972 | }, |
| 1973 | }, |
| 1974 | }); |
| 1975 | // ldr x16, [x16, 0] |
| 1976 | mem.writeIntLittle(u32, atom.code.items[16..][0..4], aarch64.Instruction.ldr(.x16, .{ |
| 1977 | .register = .{ |
| 1978 | .rn = .x16, |
| 1979 | .offset = aarch64.Instruction.LoadStoreOffset.imm(0), |
| 1980 | }, |
| 1981 | }).toU32()); |
| 1982 | atom.relocs.appendAssumeCapacity(.{ |
| 1983 | .offset = 16, |
| 1984 | .where = .undef, |
| 1985 | .where_index = self.dyld_stub_binder_index.?, |
| 1986 | .payload = .{ |
| 1987 | .page_off = .{ |
| 1988 | .kind = .got, |
| 1989 | .addend = 0, |
| 1990 | }, |
| 1991 | }, |
| 1992 | }); |
| 1993 | // br x16 |
| 1994 | mem.writeIntLittle(u32, atom.code.items[20..][0..4], aarch64.Instruction.br(.x16).toU32()); |
| 1995 | }, |
| 1996 | else => unreachable, |
| 1997 | } |
| 1998 | self.stub_helper_preamble_atom = atom; |
| 1999 | const match = MatchingSection{ |
| 2000 | .seg = self.text_segment_cmd_index.?, |
| 2001 | .sect = self.stub_helper_section_index.?, |
| 2002 | }; |
| 2003 | const alignment_pow_2 = try math.powi(u32, 2, atom.alignment); |
| 2004 | const vaddr = try self.allocateAtom(atom, atom.size, alignment_pow_2, match); |
| 2005 | sym.n_value = vaddr; |
| 2006 | sym.n_sect = @intCast(u8, self.section_ordinals.getIndex(match).? + 1); |
| 2007 | log.debug("allocated {s} atom at 0x{x}", .{ self.getString(sym.n_strx), vaddr }); |
| 1774 | 2008 | } |
| 1775 | 2009 | |
| 1776 | | fn allocateSegment(self: *MachO, index: u16, offset: u64) !void { |
| 1777 | | const seg = &self.load_commands.items[index].Segment; |
| 2010 | pub fn createStubHelperAtom(self: *MachO) !*Atom { |
| 2011 | const arch = self.base.options.target.cpu.arch; |
| 2012 | const stub_size: u4 = switch (arch) { |
| 2013 | .x86_64 => 10, |
| 2014 | .aarch64 => 3 * @sizeOf(u32), |
| 2015 | else => unreachable, |
| 2016 | }; |
| 2017 | const alignment: u2 = switch (arch) { |
| 2018 | .x86_64 => 0, |
| 2019 | .aarch64 => 2, |
| 2020 | else => unreachable, |
| 2021 | }; |
| 2022 | const local_sym_index = @intCast(u32, self.locals.items.len); |
| 2023 | try self.locals.append(self.base.allocator, .{ |
| 2024 | .n_strx = try self.makeString("l_zld_stub_in_stub_helper"), |
| 2025 | .n_type = macho.N_SECT, |
| 2026 | .n_sect = 0, |
| 2027 | .n_desc = 0, |
| 2028 | .n_value = 0, |
| 2029 | }); |
| 2030 | const atom = try self.createEmptyAtom(local_sym_index, stub_size, alignment); |
| 2031 | try atom.relocs.ensureTotalCapacity(self.base.allocator, 1); |
| 1778 | 2032 | |
| 1779 | | // Allocate the sections according to their alignment at the beginning of the segment. |
| 1780 | | var start: u64 = offset; |
| 1781 | | for (seg.sections.items) |*sect| { |
| 1782 | | const alignment = try math.powi(u32, 2, sect.@"align"); |
| 1783 | | const start_aligned = mem.alignForwardGeneric(u64, start, alignment); |
| 1784 | | const end_aligned = mem.alignForwardGeneric(u64, start_aligned + sect.size, alignment); |
| 1785 | | sect.offset = @intCast(u32, seg.inner.fileoff + start_aligned); |
| 1786 | | sect.addr = seg.inner.vmaddr + start_aligned; |
| 1787 | | start = end_aligned; |
| 2033 | switch (arch) { |
| 2034 | .x86_64 => { |
| 2035 | // pushq |
| 2036 | atom.code.items[0] = 0x68; |
| 2037 | // Next 4 bytes 1..4 are just a placeholder populated in `populateLazyBindOffsetsInStubHelper`. |
| 2038 | // jmpq |
| 2039 | atom.code.items[5] = 0xe9; |
| 2040 | atom.relocs.appendAssumeCapacity(.{ |
| 2041 | .offset = 6, |
| 2042 | .where = .local, |
| 2043 | .where_index = self.stub_helper_preamble_atom.?.local_sym_index, |
| 2044 | .payload = .{ |
| 2045 | .branch = .{ .arch = arch }, |
| 2046 | }, |
| 2047 | }); |
| 2048 | }, |
| 2049 | .aarch64 => { |
| 2050 | const literal = blk: { |
| 2051 | const div_res = try math.divExact(u64, stub_size - @sizeOf(u32), 4); |
| 2052 | break :blk try math.cast(u18, div_res); |
| 2053 | }; |
| 2054 | // ldr w16, literal |
| 2055 | mem.writeIntLittle(u32, atom.code.items[0..4], aarch64.Instruction.ldr(.w16, .{ |
| 2056 | .literal = literal, |
| 2057 | }).toU32()); |
| 2058 | // b disp |
| 2059 | mem.writeIntLittle(u32, atom.code.items[4..8], aarch64.Instruction.b(0).toU32()); |
| 2060 | atom.relocs.appendAssumeCapacity(.{ |
| 2061 | .offset = 4, |
| 2062 | .where = .local, |
| 2063 | .where_index = self.stub_helper_preamble_atom.?.local_sym_index, |
| 2064 | .payload = .{ |
| 2065 | .branch = .{ .arch = arch }, |
| 2066 | }, |
| 2067 | }); |
| 2068 | // Next 4 bytes 8..12 are just a placeholder populated in `populateLazyBindOffsetsInStubHelper`. |
| 2069 | }, |
| 2070 | else => unreachable, |
| 1788 | 2071 | } |
| 1789 | 2072 | |
| 1790 | | const seg_size_aligned = mem.alignForwardGeneric(u64, start, self.page_size); |
| 1791 | | seg.inner.filesize = seg_size_aligned; |
| 1792 | | seg.inner.vmsize = seg_size_aligned; |
| 2073 | return atom; |
| 1793 | 2074 | } |
| 1794 | 2075 | |
| 1795 | | fn allocateTextBlocks(self: *MachO) !void { |
| 1796 | | var it = self.blocks.iterator(); |
| 1797 | | while (it.next()) |entry| { |
| 1798 | | const match = entry.key_ptr.*; |
| 1799 | | var block: *TextBlock = entry.value_ptr.*; |
| 1800 | | |
| 1801 | | // Find the first block |
| 1802 | | while (block.prev) |prev| { |
| 1803 | | block = prev; |
| 1804 | | } |
| 1805 | | |
| 1806 | | const seg = self.load_commands.items[match.seg].Segment; |
| 1807 | | const sect = seg.sections.items[match.sect]; |
| 1808 | | |
| 1809 | | var base_addr: u64 = sect.addr; |
| 1810 | | const n_sect = @intCast(u8, self.section_ordinals.getIndex(match).? + 1); |
| 1811 | | |
| 1812 | | log.debug(" within section {s},{s}", .{ commands.segmentName(sect), commands.sectionName(sect) }); |
| 1813 | | log.debug(" {}", .{sect}); |
| 1814 | | |
| 1815 | | while (true) { |
| 1816 | | const block_alignment = try math.powi(u32, 2, block.alignment); |
| 1817 | | base_addr = mem.alignForwardGeneric(u64, base_addr, block_alignment); |
| 1818 | | |
| 1819 | | const sym = &self.locals.items[block.local_sym_index]; |
| 1820 | | sym.n_value = base_addr; |
| 1821 | | sym.n_sect = n_sect; |
| 2076 | pub fn createLazyPointerAtom(self: *MachO, stub_sym_index: u32, lazy_binding_sym_index: u32) !*Atom { |
| 2077 | const local_sym_index = @intCast(u32, self.locals.items.len); |
| 2078 | try self.locals.append(self.base.allocator, .{ |
| 2079 | .n_strx = try self.makeString("l_zld_lazy_ptr"), |
| 2080 | .n_type = macho.N_SECT, |
| 2081 | .n_sect = 0, |
| 2082 | .n_desc = 0, |
| 2083 | .n_value = 0, |
| 2084 | }); |
| 2085 | const atom = try self.createEmptyAtom(local_sym_index, @sizeOf(u64), 3); |
| 2086 | try atom.relocs.append(self.base.allocator, .{ |
| 2087 | .offset = 0, |
| 2088 | .where = .local, |
| 2089 | .where_index = stub_sym_index, |
| 2090 | .payload = .{ |
| 2091 | .unsigned = .{ |
| 2092 | .subtractor = null, |
| 2093 | .addend = 0, |
| 2094 | .is_64bit = true, |
| 2095 | }, |
| 2096 | }, |
| 2097 | }); |
| 2098 | try atom.rebases.append(self.base.allocator, 0); |
| 2099 | try atom.lazy_bindings.append(self.base.allocator, .{ |
| 2100 | .local_sym_index = lazy_binding_sym_index, |
| 2101 | .offset = 0, |
| 2102 | }); |
| 2103 | return atom; |
| 2104 | } |
| 1822 | 2105 | |
| 1823 | | log.debug(" {s}: start=0x{x}, end=0x{x}, size={}, align={}", .{ |
| 1824 | | self.getString(sym.n_strx), |
| 1825 | | base_addr, |
| 1826 | | base_addr + block.size, |
| 1827 | | block.size, |
| 1828 | | block.alignment, |
| 2106 | pub fn createStubAtom(self: *MachO, laptr_sym_index: u32) !*Atom { |
| 2107 | const arch = self.base.options.target.cpu.arch; |
| 2108 | const alignment: u2 = switch (arch) { |
| 2109 | .x86_64 => 0, |
| 2110 | .aarch64 => 2, |
| 2111 | else => unreachable, // unhandled architecture type |
| 2112 | }; |
| 2113 | const stub_size: u4 = switch (arch) { |
| 2114 | .x86_64 => 6, |
| 2115 | .aarch64 => 3 * @sizeOf(u32), |
| 2116 | else => unreachable, // unhandled architecture type |
| 2117 | }; |
| 2118 | const local_sym_index = @intCast(u32, self.locals.items.len); |
| 2119 | try self.locals.append(self.base.allocator, .{ |
| 2120 | .n_strx = try self.makeString("l_zld_stub"), |
| 2121 | .n_type = macho.N_SECT, |
| 2122 | .n_sect = 0, |
| 2123 | .n_desc = 0, |
| 2124 | .n_value = 0, |
| 2125 | }); |
| 2126 | const atom = try self.createEmptyAtom(local_sym_index, stub_size, alignment); |
| 2127 | switch (arch) { |
| 2128 | .x86_64 => { |
| 2129 | // jmp |
| 2130 | atom.code.items[0] = 0xff; |
| 2131 | atom.code.items[1] = 0x25; |
| 2132 | try atom.relocs.append(self.base.allocator, .{ |
| 2133 | .offset = 2, |
| 2134 | .where = .local, |
| 2135 | .where_index = laptr_sym_index, |
| 2136 | .payload = .{ |
| 2137 | .branch = .{ .arch = arch }, |
| 2138 | }, |
| 1829 | 2139 | }); |
| 1830 | | |
| 1831 | | // Update each alias (if any) |
| 1832 | | for (block.aliases.items) |index| { |
| 1833 | | const alias_sym = &self.locals.items[index]; |
| 1834 | | alias_sym.n_value = base_addr; |
| 1835 | | alias_sym.n_sect = n_sect; |
| 1836 | | } |
| 1837 | | |
| 1838 | | // Update each symbol contained within the TextBlock |
| 1839 | | for (block.contained.items) |sym_at_off| { |
| 1840 | | const contained_sym = &self.locals.items[sym_at_off.local_sym_index]; |
| 1841 | | contained_sym.n_value = base_addr + sym_at_off.offset; |
| 1842 | | contained_sym.n_sect = n_sect; |
| 1843 | | } |
| 1844 | | |
| 1845 | | base_addr += block.size; |
| 1846 | | |
| 1847 | | if (block.next) |next| { |
| 1848 | | block = next; |
| 1849 | | } else break; |
| 1850 | | } |
| 1851 | | } |
| 1852 | | |
| 1853 | | // Update globals |
| 1854 | | { |
| 1855 | | var sym_it = self.symbol_resolver.valueIterator(); |
| 1856 | | while (sym_it.next()) |resolv| { |
| 1857 | | if (resolv.where != .global) continue; |
| 1858 | | |
| 1859 | | assert(resolv.local_sym_index != 0); |
| 1860 | | const local_sym = self.locals.items[resolv.local_sym_index]; |
| 1861 | | const sym = &self.globals.items[resolv.where_index]; |
| 1862 | | sym.n_value = local_sym.n_value; |
| 1863 | | sym.n_sect = local_sym.n_sect; |
| 1864 | | } |
| 2140 | }, |
| 2141 | .aarch64 => { |
| 2142 | try atom.relocs.ensureTotalCapacity(self.base.allocator, 2); |
| 2143 | // adrp x16, pages |
| 2144 | mem.writeIntLittle(u32, atom.code.items[0..4], aarch64.Instruction.adrp(.x16, 0).toU32()); |
| 2145 | atom.relocs.appendAssumeCapacity(.{ |
| 2146 | .offset = 0, |
| 2147 | .where = .local, |
| 2148 | .where_index = laptr_sym_index, |
| 2149 | .payload = .{ |
| 2150 | .page = .{ |
| 2151 | .kind = .page, |
| 2152 | .addend = 0, |
| 2153 | }, |
| 2154 | }, |
| 2155 | }); |
| 2156 | // ldr x16, x16, offset |
| 2157 | mem.writeIntLittle(u32, atom.code.items[4..8], aarch64.Instruction.ldr(.x16, .{ |
| 2158 | .register = .{ |
| 2159 | .rn = .x16, |
| 2160 | .offset = aarch64.Instruction.LoadStoreOffset.imm(0), |
| 2161 | }, |
| 2162 | }).toU32()); |
| 2163 | atom.relocs.appendAssumeCapacity(.{ |
| 2164 | .offset = 4, |
| 2165 | .where = .local, |
| 2166 | .where_index = laptr_sym_index, |
| 2167 | .payload = .{ |
| 2168 | .page_off = .{ |
| 2169 | .kind = .page, |
| 2170 | .addend = 0, |
| 2171 | .op_kind = .load, |
| 2172 | }, |
| 2173 | }, |
| 2174 | }); |
| 2175 | // br x16 |
| 2176 | mem.writeIntLittle(u32, atom.code.items[8..12], aarch64.Instruction.br(.x16).toU32()); |
| 2177 | }, |
| 2178 | else => unreachable, |
| 1865 | 2179 | } |
| 2180 | return atom; |
| 1866 | 2181 | } |
| 1867 | 2182 | |
| 1868 | | fn writeTextBlocks(self: *MachO) !void { |
| 1869 | | var it = self.blocks.iterator(); |
| 1870 | | while (it.next()) |entry| { |
| 1871 | | const match = entry.key_ptr.*; |
| 1872 | | var block: *TextBlock = entry.value_ptr.*; |
| 1873 | | |
| 1874 | | while (block.prev) |prev| { |
| 1875 | | block = prev; |
| 1876 | | } |
| 1877 | | |
| 1878 | | const seg = self.load_commands.items[match.seg].Segment; |
| 1879 | | const sect = seg.sections.items[match.sect]; |
| 1880 | | const sect_type = commands.sectionType(sect); |
| 1881 | | |
| 1882 | | log.debug(" for section {s},{s}", .{ commands.segmentName(sect), commands.sectionName(sect) }); |
| 1883 | | log.debug(" {}", .{sect}); |
| 1884 | | |
| 1885 | | var code = try self.base.allocator.alloc(u8, sect.size); |
| 1886 | | defer self.base.allocator.free(code); |
| 1887 | | |
| 1888 | | if (sect_type == macho.S_ZEROFILL or sect_type == macho.S_THREAD_LOCAL_ZEROFILL) { |
| 1889 | | mem.set(u8, code, 0); |
| 1890 | | } else { |
| 1891 | | var base_off: u64 = 0; |
| 2183 | fn createTentativeDefAtoms(self: *MachO) !void { |
| 2184 | if (self.tentatives.count() == 0) return; |
| 2185 | // Convert any tentative definition into a regular symbol and allocate |
| 2186 | // text blocks for each tentative defintion. |
| 2187 | while (self.tentatives.popOrNull()) |entry| { |
| 2188 | const match = MatchingSection{ |
| 2189 | .seg = self.data_segment_cmd_index.?, |
| 2190 | .sect = self.bss_section_index.?, |
| 2191 | }; |
| 2192 | _ = try self.section_ordinals.getOrPut(self.base.allocator, match); |
| 1892 | 2193 | |
| 1893 | | while (true) { |
| 1894 | | const block_alignment = try math.powi(u32, 2, block.alignment); |
| 1895 | | const aligned_base_off = mem.alignForwardGeneric(u64, base_off, block_alignment); |
| 2194 | const global_sym = &self.globals.items[entry.key]; |
| 2195 | const size = global_sym.n_value; |
| 2196 | const alignment = (global_sym.n_desc >> 8) & 0x0f; |
| 1896 | 2197 | |
| 1897 | | const sym = self.locals.items[block.local_sym_index]; |
| 1898 | | log.debug(" {s}: start=0x{x}, end=0x{x}, size={}, align={}", .{ |
| 1899 | | self.getString(sym.n_strx), |
| 1900 | | aligned_base_off, |
| 1901 | | aligned_base_off + block.size, |
| 1902 | | block.size, |
| 1903 | | block.alignment, |
| 1904 | | }); |
| 2198 | global_sym.n_value = 0; |
| 2199 | global_sym.n_desc = 0; |
| 2200 | global_sym.n_sect = @intCast(u8, self.section_ordinals.getIndex(match).? + 1); |
| 1905 | 2201 | |
| 1906 | | try block.resolveRelocs(self); |
| 1907 | | mem.copy(u8, code[aligned_base_off..][0..block.size], block.code.items); |
| 2202 | const local_sym_index = @intCast(u32, self.locals.items.len); |
| 2203 | const local_sym = try self.locals.addOne(self.base.allocator); |
| 2204 | local_sym.* = .{ |
| 2205 | .n_strx = global_sym.n_strx, |
| 2206 | .n_type = macho.N_SECT, |
| 2207 | .n_sect = global_sym.n_sect, |
| 2208 | .n_desc = 0, |
| 2209 | .n_value = 0, |
| 2210 | }; |
| 1908 | 2211 | |
| 1909 | | // TODO NOP for machine code instead of just zeroing out |
| 1910 | | const padding_len = aligned_base_off - base_off; |
| 1911 | | mem.set(u8, code[base_off..][0..padding_len], 0); |
| 2212 | const resolv = self.symbol_resolver.getPtr(local_sym.n_strx) orelse unreachable; |
| 2213 | resolv.local_sym_index = local_sym_index; |
| 1912 | 2214 | |
| 1913 | | base_off = aligned_base_off + block.size; |
| 2215 | const atom = try self.createEmptyAtom(local_sym_index, size, alignment); |
| 2216 | const alignment_pow_2 = try math.powi(u32, 2, alignment); |
| 2217 | const vaddr = try self.allocateAtom(atom, size, alignment_pow_2, match); |
| 2218 | local_sym.n_value = vaddr; |
| 2219 | global_sym.n_value = vaddr; |
| 2220 | } |
| 2221 | } |
| 1914 | 2222 | |
| 1915 | | if (block.next) |next| { |
| 1916 | | block = next; |
| 1917 | | } else break; |
| 1918 | | } |
| 2223 | fn createDsoHandleAtom(self: *MachO) !void { |
| 2224 | if (self.strtab_dir.getKeyAdapted(@as([]const u8, "___dso_handle"), StringIndexAdapter{ |
| 2225 | .bytes = &self.strtab, |
| 2226 | })) |n_strx| blk: { |
| 2227 | const resolv = self.symbol_resolver.getPtr(n_strx) orelse break :blk; |
| 2228 | if (resolv.where != .undef) break :blk; |
| 1919 | 2229 | |
| 1920 | | mem.set(u8, code[base_off..], 0); |
| 1921 | | } |
| 2230 | const undef = &self.undefs.items[resolv.where_index]; |
| 2231 | const match: MatchingSection = .{ |
| 2232 | .seg = self.text_segment_cmd_index.?, |
| 2233 | .sect = self.text_section_index.?, |
| 2234 | }; |
| 2235 | const local_sym_index = @intCast(u32, self.locals.items.len); |
| 2236 | var nlist = macho.nlist_64{ |
| 2237 | .n_strx = undef.n_strx, |
| 2238 | .n_type = macho.N_SECT, |
| 2239 | .n_sect = @intCast(u8, self.section_ordinals.getIndex(match).? + 1), |
| 2240 | .n_desc = 0, |
| 2241 | .n_value = 0, |
| 2242 | }; |
| 2243 | try self.locals.append(self.base.allocator, nlist); |
| 2244 | const global_sym_index = @intCast(u32, self.globals.items.len); |
| 2245 | nlist.n_type |= macho.N_EXT; |
| 2246 | nlist.n_desc = macho.N_WEAK_DEF; |
| 2247 | try self.globals.append(self.base.allocator, nlist); |
| 1922 | 2248 | |
| 1923 | | try self.base.file.?.pwriteAll(code, sect.offset); |
| 1924 | | } |
| 1925 | | } |
| 2249 | _ = self.unresolved.fetchSwapRemove(resolv.where_index); |
| 1926 | 2250 | |
| 1927 | | fn writeStubHelperCommon(self: *MachO) !void { |
| 1928 | | const text_segment = &self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 1929 | | const stub_helper = &text_segment.sections.items[self.stub_helper_section_index.?]; |
| 1930 | | const data_const_segment = &self.load_commands.items[self.data_const_segment_cmd_index.?].Segment; |
| 1931 | | const got = &data_const_segment.sections.items[self.got_section_index.?]; |
| 1932 | | const data_segment = &self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 1933 | | const data = &data_segment.sections.items[self.data_section_index.?]; |
| 1934 | | |
| 1935 | | self.stub_helper_stubs_start_off = blk: { |
| 1936 | | switch (self.base.options.target.cpu.arch) { |
| 1937 | | .x86_64 => { |
| 1938 | | const code_size = 15; |
| 1939 | | var code: [code_size]u8 = undefined; |
| 1940 | | // lea %r11, [rip + disp] |
| 1941 | | code[0] = 0x4c; |
| 1942 | | code[1] = 0x8d; |
| 1943 | | code[2] = 0x1d; |
| 1944 | | { |
| 1945 | | const target_addr = data.addr + data.size - @sizeOf(u64); |
| 1946 | | const displacement = try math.cast(u32, target_addr - stub_helper.addr - 7); |
| 1947 | | mem.writeIntLittle(u32, code[3..7], displacement); |
| 1948 | | } |
| 1949 | | // push %r11 |
| 1950 | | code[7] = 0x41; |
| 1951 | | code[8] = 0x53; |
| 1952 | | // jmp [rip + disp] |
| 1953 | | code[9] = 0xff; |
| 1954 | | code[10] = 0x25; |
| 1955 | | { |
| 1956 | | const n_strx = self.strtab_dir.getKeyAdapted(@as([]const u8, "dyld_stub_binder"), StringIndexAdapter{ |
| 1957 | | .bytes = &self.strtab, |
| 1958 | | }) orelse unreachable; |
| 1959 | | const resolv = self.symbol_resolver.get(n_strx) orelse unreachable; |
| 1960 | | const got_index = self.got_entries_map.get(.{ |
| 1961 | | .where = .undef, |
| 1962 | | .where_index = resolv.where_index, |
| 1963 | | }) orelse unreachable; |
| 1964 | | const addr = got.addr + got_index * @sizeOf(u64); |
| 1965 | | const displacement = try math.cast(u32, addr - stub_helper.addr - code_size); |
| 1966 | | mem.writeIntLittle(u32, code[11..], displacement); |
| 1967 | | } |
| 1968 | | try self.base.file.?.pwriteAll(&code, stub_helper.offset); |
| 1969 | | break :blk stub_helper.offset + code_size; |
| 1970 | | }, |
| 1971 | | .aarch64 => { |
| 1972 | | var code: [6 * @sizeOf(u32)]u8 = undefined; |
| 1973 | | data_blk_outer: { |
| 1974 | | const this_addr = stub_helper.addr; |
| 1975 | | const target_addr = data.addr + data.size - @sizeOf(u64); |
| 1976 | | data_blk: { |
| 1977 | | const displacement = math.cast(i21, target_addr - this_addr) catch break :data_blk; |
| 1978 | | // adr x17, disp |
| 1979 | | mem.writeIntLittle(u32, code[0..4], aarch64.Instruction.adr(.x17, displacement).toU32()); |
| 1980 | | // nop |
| 1981 | | mem.writeIntLittle(u32, code[4..8], aarch64.Instruction.nop().toU32()); |
| 1982 | | break :data_blk_outer; |
| 1983 | | } |
| 1984 | | data_blk: { |
| 1985 | | const new_this_addr = this_addr + @sizeOf(u32); |
| 1986 | | const displacement = math.cast(i21, target_addr - new_this_addr) catch break :data_blk; |
| 1987 | | // nop |
| 1988 | | mem.writeIntLittle(u32, code[0..4], aarch64.Instruction.nop().toU32()); |
| 1989 | | // adr x17, disp |
| 1990 | | mem.writeIntLittle(u32, code[4..8], aarch64.Instruction.adr(.x17, displacement).toU32()); |
| 1991 | | break :data_blk_outer; |
| 1992 | | } |
| 1993 | | // Jump is too big, replace adr with adrp and add. |
| 1994 | | const this_page = @intCast(i32, this_addr >> 12); |
| 1995 | | const target_page = @intCast(i32, target_addr >> 12); |
| 1996 | | const pages = @intCast(i21, target_page - this_page); |
| 1997 | | mem.writeIntLittle(u32, code[0..4], aarch64.Instruction.adrp(.x17, pages).toU32()); |
| 1998 | | const narrowed = @truncate(u12, target_addr); |
| 1999 | | mem.writeIntLittle(u32, code[4..8], aarch64.Instruction.add(.x17, .x17, narrowed, false).toU32()); |
| 2000 | | } |
| 2001 | | // stp x16, x17, [sp, #-16]! |
| 2002 | | code[8] = 0xf0; |
| 2003 | | code[9] = 0x47; |
| 2004 | | code[10] = 0xbf; |
| 2005 | | code[11] = 0xa9; |
| 2006 | | binder_blk_outer: { |
| 2007 | | const n_strx = self.strtab_dir.getKeyAdapted(@as([]const u8, "dyld_stub_binder"), StringIndexAdapter{ |
| 2008 | | .bytes = &self.strtab, |
| 2009 | | }) orelse unreachable; |
| 2010 | | const resolv = self.symbol_resolver.get(n_strx) orelse unreachable; |
| 2011 | | const got_index = self.got_entries_map.get(.{ |
| 2012 | | .where = .undef, |
| 2013 | | .where_index = resolv.where_index, |
| 2014 | | }) orelse unreachable; |
| 2015 | | const this_addr = stub_helper.addr + 3 * @sizeOf(u32); |
| 2016 | | const target_addr = got.addr + got_index * @sizeOf(u64); |
| 2017 | | binder_blk: { |
| 2018 | | const displacement = math.divExact(u64, target_addr - this_addr, 4) catch break :binder_blk; |
| 2019 | | const literal = math.cast(u18, displacement) catch break :binder_blk; |
| 2020 | | // ldr x16, label |
| 2021 | | mem.writeIntLittle(u32, code[12..16], aarch64.Instruction.ldr(.x16, .{ |
| 2022 | | .literal = literal, |
| 2023 | | }).toU32()); |
| 2024 | | // nop |
| 2025 | | mem.writeIntLittle(u32, code[16..20], aarch64.Instruction.nop().toU32()); |
| 2026 | | break :binder_blk_outer; |
| 2027 | | } |
| 2028 | | binder_blk: { |
| 2029 | | const new_this_addr = this_addr + @sizeOf(u32); |
| 2030 | | const displacement = math.divExact(u64, target_addr - new_this_addr, 4) catch break :binder_blk; |
| 2031 | | const literal = math.cast(u18, displacement) catch break :binder_blk; |
| 2032 | | // Pad with nop to please division. |
| 2033 | | // nop |
| 2034 | | mem.writeIntLittle(u32, code[12..16], aarch64.Instruction.nop().toU32()); |
| 2035 | | // ldr x16, label |
| 2036 | | mem.writeIntLittle(u32, code[16..20], aarch64.Instruction.ldr(.x16, .{ |
| 2037 | | .literal = literal, |
| 2038 | | }).toU32()); |
| 2039 | | break :binder_blk_outer; |
| 2040 | | } |
| 2041 | | // Use adrp followed by ldr(immediate). |
| 2042 | | const this_page = @intCast(i32, this_addr >> 12); |
| 2043 | | const target_page = @intCast(i32, target_addr >> 12); |
| 2044 | | const pages = @intCast(i21, target_page - this_page); |
| 2045 | | mem.writeIntLittle(u32, code[12..16], aarch64.Instruction.adrp(.x16, pages).toU32()); |
| 2046 | | const narrowed = @truncate(u12, target_addr); |
| 2047 | | const offset = try math.divExact(u12, narrowed, 8); |
| 2048 | | mem.writeIntLittle(u32, code[16..20], aarch64.Instruction.ldr(.x16, .{ |
| 2049 | | .register = .{ |
| 2050 | | .rn = .x16, |
| 2051 | | .offset = aarch64.Instruction.LoadStoreOffset.imm(offset), |
| 2052 | | }, |
| 2053 | | }).toU32()); |
| 2054 | | } |
| 2055 | | // br x16 |
| 2056 | | code[20] = 0x00; |
| 2057 | | code[21] = 0x02; |
| 2058 | | code[22] = 0x1f; |
| 2059 | | code[23] = 0xd6; |
| 2060 | | try self.base.file.?.pwriteAll(&code, stub_helper.offset); |
| 2061 | | break :blk stub_helper.offset + 6 * @sizeOf(u32); |
| 2062 | | }, |
| 2063 | | else => unreachable, |
| 2064 | | } |
| 2065 | | }; |
| 2251 | undef.* = .{ |
| 2252 | .n_strx = 0, |
| 2253 | .n_type = macho.N_UNDF, |
| 2254 | .n_sect = 0, |
| 2255 | .n_desc = 0, |
| 2256 | .n_value = 0, |
| 2257 | }; |
| 2258 | resolv.* = .{ |
| 2259 | .where = .global, |
| 2260 | .where_index = global_sym_index, |
| 2261 | .local_sym_index = local_sym_index, |
| 2262 | }; |
| 2066 | 2263 | |
| 2067 | | for (self.stubs.items) |_, i| { |
| 2068 | | const index = @intCast(u32, i); |
| 2069 | | // TODO weak bound pointers |
| 2070 | | try self.writeLazySymbolPointer(index); |
| 2071 | | try self.writeStub(index); |
| 2072 | | try self.writeStubInStubHelper(index); |
| 2264 | // We create an empty atom for this symbol. |
| 2265 | // TODO perhaps we should special-case special symbols? Create a separate |
| 2266 | // linked list of atoms? |
| 2267 | const atom = try self.createEmptyAtom(local_sym_index, 0, 0); |
| 2268 | const sym = &self.locals.items[local_sym_index]; |
| 2269 | const vaddr = try self.allocateAtom(atom, 0, 1, match); |
| 2270 | sym.n_value = vaddr; |
| 2271 | atom.dirty = false; // We don't really want to write it to file. |
| 2073 | 2272 | } |
| 2074 | 2273 | } |
| 2075 | 2274 | |
| 2076 | | fn resolveSymbolsInObject( |
| 2077 | | self: *MachO, |
| 2078 | | object_id: u16, |
| 2079 | | tentatives: *std.AutoArrayHashMap(u32, void), |
| 2080 | | unresolved: *std.AutoArrayHashMap(u32, void), |
| 2081 | | ) !void { |
| 2275 | fn resolveSymbolsInObject(self: *MachO, object_id: u16) !void { |
| 2082 | 2276 | const object = &self.objects.items[object_id]; |
| 2083 | 2277 | |
| 2084 | 2278 | log.debug("resolving symbols in '{s}'", .{object.name}); |
| ... | ... | @@ -2150,7 +2344,7 @@ fn resolveSymbolsInObject( |
| 2150 | 2344 | const global = &self.globals.items[resolv.where_index]; |
| 2151 | 2345 | |
| 2152 | 2346 | if (symbolIsTentative(global.*)) { |
| 2153 | | _ = tentatives.fetchSwapRemove(resolv.where_index); |
| 2347 | _ = self.tentatives.fetchSwapRemove(resolv.where_index); |
| 2154 | 2348 | } else if (!(symbolIsWeakDef(sym) or symbolIsPext(sym)) and |
| 2155 | 2349 | !(symbolIsWeakDef(global.*) or symbolIsPext(global.*))) |
| 2156 | 2350 | { |
| ... | ... | @@ -2168,15 +2362,7 @@ fn resolveSymbolsInObject( |
| 2168 | 2362 | continue; |
| 2169 | 2363 | }, |
| 2170 | 2364 | .undef => { |
| 2171 | | const undef = &self.undefs.items[resolv.where_index]; |
| 2172 | | undef.* = .{ |
| 2173 | | .n_strx = 0, |
| 2174 | | .n_type = macho.N_UNDF, |
| 2175 | | .n_sect = 0, |
| 2176 | | .n_desc = 0, |
| 2177 | | .n_value = 0, |
| 2178 | | }; |
| 2179 | | _ = unresolved.fetchSwapRemove(resolv.where_index); |
| 2365 | _ = self.unresolved.fetchSwapRemove(resolv.where_index); |
| 2180 | 2366 | }, |
| 2181 | 2367 | } |
| 2182 | 2368 | |
| ... | ... | @@ -2210,7 +2396,7 @@ fn resolveSymbolsInObject( |
| 2210 | 2396 | .where_index = global_sym_index, |
| 2211 | 2397 | .file = object_id, |
| 2212 | 2398 | }); |
| 2213 | | _ = try tentatives.getOrPut(global_sym_index); |
| 2399 | _ = try self.tentatives.getOrPut(self.base.allocator, global_sym_index); |
| 2214 | 2400 | continue; |
| 2215 | 2401 | }; |
| 2216 | 2402 | |
| ... | ... | @@ -2234,7 +2420,7 @@ fn resolveSymbolsInObject( |
| 2234 | 2420 | .n_desc = sym.n_desc, |
| 2235 | 2421 | .n_value = sym.n_value, |
| 2236 | 2422 | }); |
| 2237 | | _ = try tentatives.getOrPut(global_sym_index); |
| 2423 | _ = try self.tentatives.getOrPut(self.base.allocator, global_sym_index); |
| 2238 | 2424 | resolv.* = .{ |
| 2239 | 2425 | .where = .global, |
| 2240 | 2426 | .where_index = global_sym_index, |
| ... | ... | @@ -2247,7 +2433,7 @@ fn resolveSymbolsInObject( |
| 2247 | 2433 | .n_desc = 0, |
| 2248 | 2434 | .n_value = 0, |
| 2249 | 2435 | }; |
| 2250 | | _ = unresolved.fetchSwapRemove(resolv.where_index); |
| 2436 | _ = self.unresolved.fetchSwapRemove(resolv.where_index); |
| 2251 | 2437 | }, |
| 2252 | 2438 | } |
| 2253 | 2439 | } else { |
| ... | ... | @@ -2267,27 +2453,17 @@ fn resolveSymbolsInObject( |
| 2267 | 2453 | .where_index = undef_sym_index, |
| 2268 | 2454 | .file = object_id, |
| 2269 | 2455 | }); |
| 2270 | | _ = try unresolved.getOrPut(undef_sym_index); |
| 2456 | try self.unresolved.putNoClobber(self.base.allocator, undef_sym_index, .none); |
| 2271 | 2457 | } |
| 2272 | 2458 | } |
| 2273 | 2459 | } |
| 2274 | 2460 | |
| 2275 | | fn resolveSymbols(self: *MachO) !void { |
| 2276 | | var tentatives = std.AutoArrayHashMap(u32, void).init(self.base.allocator); |
| 2277 | | defer tentatives.deinit(); |
| 2278 | | |
| 2279 | | var unresolved = std.AutoArrayHashMap(u32, void).init(self.base.allocator); |
| 2280 | | defer unresolved.deinit(); |
| 2281 | | |
| 2282 | | // First pass, resolve symbols in provided objects. |
| 2283 | | for (self.objects.items) |_, object_id| { |
| 2284 | | try self.resolveSymbolsInObject(@intCast(u16, object_id), &tentatives, &unresolved); |
| 2285 | | } |
| 2461 | fn resolveSymbolsInArchives(self: *MachO) !void { |
| 2462 | if (self.archives.items.len == 0) return; |
| 2286 | 2463 | |
| 2287 | | // Second pass, resolve symbols in static libraries. |
| 2288 | 2464 | var next_sym: usize = 0; |
| 2289 | | loop: while (next_sym < unresolved.count()) { |
| 2290 | | const sym = self.undefs.items[unresolved.keys()[next_sym]]; |
| 2465 | loop: while (next_sym < self.unresolved.count()) { |
| 2466 | const sym = self.undefs.items[self.unresolved.keys()[next_sym]]; |
| 2291 | 2467 | const sym_name = self.getString(sym.n_strx); |
| 2292 | 2468 | |
| 2293 | 2469 | for (self.archives.items) |archive| { |
| ... | ... | @@ -2301,102 +2477,21 @@ fn resolveSymbols(self: *MachO) !void { |
| 2301 | 2477 | const object_id = @intCast(u16, self.objects.items.len); |
| 2302 | 2478 | const object = try self.objects.addOne(self.base.allocator); |
| 2303 | 2479 | object.* = try archive.parseObject(self.base.allocator, self.base.options.target, offsets.items[0]); |
| 2304 | | try self.resolveSymbolsInObject(object_id, &tentatives, &unresolved); |
| 2480 | try self.resolveSymbolsInObject(object_id); |
| 2305 | 2481 | |
| 2306 | 2482 | continue :loop; |
| 2307 | 2483 | } |
| 2308 | 2484 | |
| 2309 | 2485 | next_sym += 1; |
| 2310 | 2486 | } |
| 2487 | } |
| 2311 | 2488 | |
| 2312 | | // Convert any tentative definition into a regular symbol and allocate |
| 2313 | | // text blocks for each tentative defintion. |
| 2314 | | while (tentatives.popOrNull()) |entry| { |
| 2315 | | const sym = &self.globals.items[entry.key]; |
| 2316 | | const match: MatchingSection = blk: { |
| 2317 | | if (self.common_section_index == null) { |
| 2318 | | const data_seg = &self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 2319 | | self.common_section_index = @intCast(u16, data_seg.sections.items.len); |
| 2320 | | try data_seg.addSection(self.base.allocator, "__common", .{ |
| 2321 | | .flags = macho.S_ZEROFILL, |
| 2322 | | }); |
| 2323 | | } |
| 2324 | | break :blk .{ |
| 2325 | | .seg = self.data_segment_cmd_index.?, |
| 2326 | | .sect = self.common_section_index.?, |
| 2327 | | }; |
| 2328 | | }; |
| 2329 | | _ = try self.section_ordinals.getOrPut(self.base.allocator, match); |
| 2330 | | |
| 2331 | | const size = sym.n_value; |
| 2332 | | const code = try self.base.allocator.alloc(u8, size); |
| 2333 | | defer self.base.allocator.free(code); |
| 2334 | | mem.set(u8, code, 0); |
| 2335 | | const alignment = (sym.n_desc >> 8) & 0x0f; |
| 2336 | | |
| 2337 | | sym.n_value = 0; |
| 2338 | | sym.n_desc = 0; |
| 2339 | | sym.n_sect = @intCast(u8, self.section_ordinals.getIndex(match).? + 1); |
| 2340 | | var local_sym = sym.*; |
| 2341 | | local_sym.n_type = macho.N_SECT; |
| 2342 | | |
| 2343 | | const local_sym_index = @intCast(u32, self.locals.items.len); |
| 2344 | | try self.locals.append(self.base.allocator, local_sym); |
| 2345 | | |
| 2346 | | const resolv = self.symbol_resolver.getPtr(sym.n_strx) orelse unreachable; |
| 2347 | | resolv.local_sym_index = local_sym_index; |
| 2348 | | |
| 2349 | | const block = try self.base.allocator.create(TextBlock); |
| 2350 | | block.* = TextBlock.empty; |
| 2351 | | block.local_sym_index = local_sym_index; |
| 2352 | | block.size = size; |
| 2353 | | block.alignment = alignment; |
| 2354 | | try self.managed_blocks.append(self.base.allocator, block); |
| 2355 | | |
| 2356 | | try block.code.appendSlice(self.base.allocator, code); |
| 2357 | | |
| 2358 | | // Update target section's metadata |
| 2359 | | // TODO should we update segment's size here too? |
| 2360 | | // How does it tie with incremental space allocs? |
| 2361 | | const tseg = &self.load_commands.items[match.seg].Segment; |
| 2362 | | const tsect = &tseg.sections.items[match.sect]; |
| 2363 | | const new_alignment = math.max(tsect.@"align", block.alignment); |
| 2364 | | const new_alignment_pow_2 = try math.powi(u32, 2, new_alignment); |
| 2365 | | const new_size = mem.alignForwardGeneric(u64, tsect.size, new_alignment_pow_2) + block.size; |
| 2366 | | tsect.size = new_size; |
| 2367 | | tsect.@"align" = new_alignment; |
| 2368 | | |
| 2369 | | if (self.blocks.getPtr(match)) |last| { |
| 2370 | | last.*.next = block; |
| 2371 | | block.prev = last.*; |
| 2372 | | last.* = block; |
| 2373 | | } else { |
| 2374 | | try self.blocks.putNoClobber(self.base.allocator, match, block); |
| 2375 | | } |
| 2376 | | } |
| 2377 | | |
| 2378 | | // Third pass, resolve symbols in dynamic libraries. |
| 2379 | | { |
| 2380 | | // Put dyld_stub_binder as an undefined special symbol. |
| 2381 | | const n_strx = try self.makeString("dyld_stub_binder"); |
| 2382 | | const undef_sym_index = @intCast(u32, self.undefs.items.len); |
| 2383 | | try self.undefs.append(self.base.allocator, .{ |
| 2384 | | .n_strx = n_strx, |
| 2385 | | .n_type = macho.N_UNDF, |
| 2386 | | .n_sect = 0, |
| 2387 | | .n_desc = 0, |
| 2388 | | .n_value = 0, |
| 2389 | | }); |
| 2390 | | try self.symbol_resolver.putNoClobber(self.base.allocator, n_strx, .{ |
| 2391 | | .where = .undef, |
| 2392 | | .where_index = undef_sym_index, |
| 2393 | | }); |
| 2394 | | _ = try unresolved.getOrPut(undef_sym_index); |
| 2395 | | } |
| 2489 | fn resolveSymbolsInDylibs(self: *MachO) !void { |
| 2490 | if (self.dylibs.items.len == 0) return; |
| 2396 | 2491 | |
| 2397 | | next_sym = 0; |
| 2398 | | loop: while (next_sym < unresolved.count()) { |
| 2399 | | const sym = self.undefs.items[unresolved.keys()[next_sym]]; |
| 2492 | var next_sym: usize = 0; |
| 2493 | loop: while (next_sym < self.unresolved.count()) { |
| 2494 | const sym = self.undefs.items[self.unresolved.keys()[next_sym]]; |
| 2400 | 2495 | const sym_name = self.getString(sym.n_strx); |
| 2401 | 2496 | |
| 2402 | 2497 | for (self.dylibs.items) |dylib, id| { |
| ... | ... | @@ -2404,6 +2499,7 @@ fn resolveSymbols(self: *MachO) !void { |
| 2404 | 2499 | |
| 2405 | 2500 | const dylib_id = @intCast(u16, id); |
| 2406 | 2501 | if (!self.referenced_dylibs.contains(dylib_id)) { |
| 2502 | try self.addLoadDylibLC(dylib_id); |
| 2407 | 2503 | try self.referenced_dylibs.putNoClobber(self.base.allocator, dylib_id, {}); |
| 2408 | 2504 | } |
| 2409 | 2505 | |
| ... | ... | @@ -2413,3115 +2509,1859 @@ fn resolveSymbols(self: *MachO) !void { |
| 2413 | 2509 | undef.n_type |= macho.N_EXT; |
| 2414 | 2510 | undef.n_desc = @intCast(u16, ordinal + 1) * macho.N_SYMBOL_RESOLVER; |
| 2415 | 2511 | |
| 2416 | | _ = unresolved.fetchSwapRemove(resolv.where_index); |
| 2512 | if (self.unresolved.fetchSwapRemove(resolv.where_index)) |entry| outer_blk: { |
| 2513 | switch (entry.value) { |
| 2514 | .none => {}, |
| 2515 | .got => return error.TODOGotHint, |
| 2516 | .stub => { |
| 2517 | if (self.stubs_map.contains(resolv.where_index)) break :outer_blk; |
| 2518 | const stub_helper_atom = blk: { |
| 2519 | const match = MatchingSection{ |
| 2520 | .seg = self.text_segment_cmd_index.?, |
| 2521 | .sect = self.stub_helper_section_index.?, |
| 2522 | }; |
| 2523 | const atom = try self.createStubHelperAtom(); |
| 2524 | const atom_sym = &self.locals.items[atom.local_sym_index]; |
| 2525 | const alignment = try math.powi(u32, 2, atom.alignment); |
| 2526 | const vaddr = try self.allocateAtom(atom, atom.size, alignment, match); |
| 2527 | atom_sym.n_value = vaddr; |
| 2528 | atom_sym.n_sect = @intCast(u8, self.section_ordinals.getIndex(match).? + 1); |
| 2529 | break :blk atom; |
| 2530 | }; |
| 2531 | const laptr_atom = blk: { |
| 2532 | const match = MatchingSection{ |
| 2533 | .seg = self.data_segment_cmd_index.?, |
| 2534 | .sect = self.la_symbol_ptr_section_index.?, |
| 2535 | }; |
| 2536 | const atom = try self.createLazyPointerAtom( |
| 2537 | stub_helper_atom.local_sym_index, |
| 2538 | resolv.where_index, |
| 2539 | ); |
| 2540 | const atom_sym = &self.locals.items[atom.local_sym_index]; |
| 2541 | const alignment = try math.powi(u32, 2, atom.alignment); |
| 2542 | const vaddr = try self.allocateAtom(atom, atom.size, alignment, match); |
| 2543 | atom_sym.n_value = vaddr; |
| 2544 | atom_sym.n_sect = @intCast(u8, self.section_ordinals.getIndex(match).? + 1); |
| 2545 | break :blk atom; |
| 2546 | }; |
| 2547 | const stub_atom = blk: { |
| 2548 | const match = MatchingSection{ |
| 2549 | .seg = self.text_segment_cmd_index.?, |
| 2550 | .sect = self.stubs_section_index.?, |
| 2551 | }; |
| 2552 | const atom = try self.createStubAtom(laptr_atom.local_sym_index); |
| 2553 | const atom_sym = &self.locals.items[atom.local_sym_index]; |
| 2554 | const alignment = try math.powi(u32, 2, atom.alignment); |
| 2555 | const vaddr = try self.allocateAtom(atom, atom.size, alignment, match); |
| 2556 | atom_sym.n_value = vaddr; |
| 2557 | atom_sym.n_sect = @intCast(u8, self.section_ordinals.getIndex(match).? + 1); |
| 2558 | break :blk atom; |
| 2559 | }; |
| 2560 | try self.stubs_map.putNoClobber(self.base.allocator, resolv.where_index, stub_atom); |
| 2561 | }, |
| 2562 | } |
| 2563 | } |
| 2417 | 2564 | |
| 2418 | 2565 | continue :loop; |
| 2419 | 2566 | } |
| 2420 | 2567 | |
| 2421 | 2568 | next_sym += 1; |
| 2422 | 2569 | } |
| 2570 | } |
| 2423 | 2571 | |
| 2424 | | // Fourth pass, handle synthetic symbols and flag any undefined references. |
| 2425 | | if (self.strtab_dir.getKeyAdapted(@as([]const u8, "___dso_handle"), StringIndexAdapter{ |
| 2426 | | .bytes = &self.strtab, |
| 2427 | | })) |n_strx| blk: { |
| 2428 | | const resolv = self.symbol_resolver.getPtr(n_strx) orelse break :blk; |
| 2429 | | if (resolv.where != .undef) break :blk; |
| 2430 | | |
| 2431 | | const undef = &self.undefs.items[resolv.where_index]; |
| 2432 | | const match: MatchingSection = .{ |
| 2433 | | .seg = self.text_segment_cmd_index.?, |
| 2434 | | .sect = self.text_section_index.?, |
| 2435 | | }; |
| 2436 | | const local_sym_index = @intCast(u32, self.locals.items.len); |
| 2437 | | var nlist = macho.nlist_64{ |
| 2438 | | .n_strx = undef.n_strx, |
| 2439 | | .n_type = macho.N_SECT, |
| 2440 | | .n_sect = @intCast(u8, self.section_ordinals.getIndex(match).? + 1), |
| 2441 | | .n_desc = 0, |
| 2442 | | .n_value = 0, |
| 2443 | | }; |
| 2444 | | try self.locals.append(self.base.allocator, nlist); |
| 2445 | | const global_sym_index = @intCast(u32, self.globals.items.len); |
| 2446 | | nlist.n_type |= macho.N_EXT; |
| 2447 | | nlist.n_desc = macho.N_WEAK_DEF; |
| 2448 | | try self.globals.append(self.base.allocator, nlist); |
| 2572 | fn resolveDyldStubBinder(self: *MachO) !void { |
| 2573 | if (self.dyld_stub_binder_index != null) return; |
| 2449 | 2574 | |
| 2450 | | _ = unresolved.fetchSwapRemove(resolv.where_index); |
| 2575 | const n_strx = try self.makeString("dyld_stub_binder"); |
| 2576 | const sym_index = @intCast(u32, self.undefs.items.len); |
| 2577 | try self.undefs.append(self.base.allocator, .{ |
| 2578 | .n_strx = n_strx, |
| 2579 | .n_type = macho.N_UNDF, |
| 2580 | .n_sect = 0, |
| 2581 | .n_desc = 0, |
| 2582 | .n_value = 0, |
| 2583 | }); |
| 2584 | try self.symbol_resolver.putNoClobber(self.base.allocator, n_strx, .{ |
| 2585 | .where = .undef, |
| 2586 | .where_index = sym_index, |
| 2587 | }); |
| 2588 | const sym = &self.undefs.items[sym_index]; |
| 2589 | const sym_name = self.getString(n_strx); |
| 2451 | 2590 | |
| 2452 | | undef.* = .{ |
| 2453 | | .n_strx = 0, |
| 2454 | | .n_type = macho.N_UNDF, |
| 2455 | | .n_sect = 0, |
| 2456 | | .n_desc = 0, |
| 2457 | | .n_value = 0, |
| 2458 | | }; |
| 2459 | | resolv.* = .{ |
| 2460 | | .where = .global, |
| 2461 | | .where_index = global_sym_index, |
| 2462 | | .local_sym_index = local_sym_index, |
| 2463 | | }; |
| 2591 | for (self.dylibs.items) |dylib, id| { |
| 2592 | if (!dylib.symbols.contains(sym_name)) continue; |
| 2464 | 2593 | |
| 2465 | | // We create an empty atom for this symbol. |
| 2466 | | // TODO perhaps we should special-case special symbols? Create a separate |
| 2467 | | // linked list of atoms? |
| 2468 | | const block = try self.base.allocator.create(TextBlock); |
| 2469 | | block.* = TextBlock.empty; |
| 2470 | | block.local_sym_index = local_sym_index; |
| 2471 | | block.size = 0; |
| 2472 | | block.alignment = 0; |
| 2473 | | try self.managed_blocks.append(self.base.allocator, block); |
| 2474 | | |
| 2475 | | if (self.blocks.getPtr(match)) |last| { |
| 2476 | | last.*.next = block; |
| 2477 | | block.prev = last.*; |
| 2478 | | last.* = block; |
| 2479 | | } else { |
| 2480 | | try self.blocks.putNoClobber(self.base.allocator, match, block); |
| 2594 | const dylib_id = @intCast(u16, id); |
| 2595 | if (!self.referenced_dylibs.contains(dylib_id)) { |
| 2596 | try self.addLoadDylibLC(dylib_id); |
| 2597 | try self.referenced_dylibs.putNoClobber(self.base.allocator, dylib_id, {}); |
| 2481 | 2598 | } |
| 2482 | | } |
| 2483 | 2599 | |
| 2484 | | for (unresolved.keys()) |index| { |
| 2485 | | const sym = self.undefs.items[index]; |
| 2486 | | const sym_name = self.getString(sym.n_strx); |
| 2487 | | const resolv = self.symbol_resolver.get(sym.n_strx) orelse unreachable; |
| 2600 | const ordinal = self.referenced_dylibs.getIndex(dylib_id) orelse unreachable; |
| 2601 | sym.n_type |= macho.N_EXT; |
| 2602 | sym.n_desc = @intCast(u16, ordinal + 1) * macho.N_SYMBOL_RESOLVER; |
| 2603 | self.dyld_stub_binder_index = sym_index; |
| 2488 | 2604 | |
| 2489 | | log.err("undefined reference to symbol '{s}'", .{sym_name}); |
| 2490 | | log.err(" first referenced in '{s}'", .{self.objects.items[resolv.file].name}); |
| 2605 | break; |
| 2491 | 2606 | } |
| 2492 | 2607 | |
| 2493 | | if (unresolved.count() > 0) |
| 2608 | if (self.dyld_stub_binder_index == null) { |
| 2609 | log.err("undefined reference to symbol '{s}'", .{sym_name}); |
| 2494 | 2610 | return error.UndefinedSymbolReference; |
| 2611 | } |
| 2612 | |
| 2613 | // Add dyld_stub_binder as the final GOT entry. |
| 2614 | const got_entry = GotIndirectionKey{ |
| 2615 | .where = .undef, |
| 2616 | .where_index = self.dyld_stub_binder_index.?, |
| 2617 | }; |
| 2618 | const atom = try self.createGotAtom(got_entry); |
| 2619 | try self.got_entries_map.putNoClobber(self.base.allocator, got_entry, atom); |
| 2620 | const match = MatchingSection{ |
| 2621 | .seg = self.data_const_segment_cmd_index.?, |
| 2622 | .sect = self.got_section_index.?, |
| 2623 | }; |
| 2624 | const atom_sym = &self.locals.items[atom.local_sym_index]; |
| 2625 | const vaddr = try self.allocateAtom(atom, @sizeOf(u64), 8, match); |
| 2626 | atom_sym.n_value = vaddr; |
| 2627 | atom_sym.n_sect = @intCast(u8, self.section_ordinals.getIndex(match).? + 1); |
| 2628 | log.debug("allocated {s} atom at 0x{x}", .{ self.getString(sym.n_strx), vaddr }); |
| 2495 | 2629 | } |
| 2496 | 2630 | |
| 2497 | | fn parseTextBlocks(self: *MachO) !void { |
| 2631 | fn parseObjectsIntoAtoms(self: *MachO) !void { |
| 2632 | const tracy = trace(@src()); |
| 2633 | defer tracy.end(); |
| 2634 | |
| 2635 | var parsed_atoms = Object.ParsedAtoms.init(self.base.allocator); |
| 2636 | defer parsed_atoms.deinit(); |
| 2637 | |
| 2638 | var first_atoms = Object.ParsedAtoms.init(self.base.allocator); |
| 2639 | defer first_atoms.deinit(); |
| 2640 | |
| 2641 | var section_metadata = std.AutoHashMap(MatchingSection, struct { |
| 2642 | size: u64, |
| 2643 | alignment: u32, |
| 2644 | }).init(self.base.allocator); |
| 2645 | defer section_metadata.deinit(); |
| 2646 | |
| 2498 | 2647 | for (self.objects.items) |*object, object_id| { |
| 2499 | | try object.parseTextBlocks(self.base.allocator, @intCast(u16, object_id), self); |
| 2500 | | } |
| 2501 | | } |
| 2648 | if (object.analyzed) continue; |
| 2502 | 2649 | |
| 2503 | | fn populateMetadata(self: *MachO) !void { |
| 2504 | | if (self.pagezero_segment_cmd_index == null) { |
| 2505 | | self.pagezero_segment_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 2506 | | try self.load_commands.append(self.base.allocator, .{ |
| 2507 | | .Segment = SegmentCommand.empty("__PAGEZERO", .{ |
| 2508 | | .vmsize = 0x100000000, // size always set to 4GB |
| 2509 | | }), |
| 2510 | | }); |
| 2511 | | } |
| 2650 | var atoms_in_objects = try object.parseIntoAtoms(self.base.allocator, @intCast(u16, object_id), self); |
| 2651 | defer atoms_in_objects.deinit(); |
| 2512 | 2652 | |
| 2513 | | if (self.text_segment_cmd_index == null) { |
| 2514 | | self.text_segment_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 2515 | | try self.load_commands.append(self.base.allocator, .{ |
| 2516 | | .Segment = SegmentCommand.empty("__TEXT", .{ |
| 2517 | | .vmaddr = 0x100000000, // always starts at 4GB |
| 2518 | | .maxprot = macho.VM_PROT_READ | macho.VM_PROT_EXECUTE, |
| 2519 | | .initprot = macho.VM_PROT_READ | macho.VM_PROT_EXECUTE, |
| 2520 | | }), |
| 2521 | | }); |
| 2522 | | } |
| 2653 | var it = atoms_in_objects.iterator(); |
| 2654 | while (it.next()) |entry| { |
| 2655 | const match = entry.key_ptr.*; |
| 2656 | const last_atom = entry.value_ptr.*; |
| 2657 | var atom = last_atom; |
| 2658 | |
| 2659 | const metadata = try section_metadata.getOrPut(match); |
| 2660 | if (!metadata.found_existing) { |
| 2661 | metadata.value_ptr.* = .{ |
| 2662 | .size = 0, |
| 2663 | .alignment = 0, |
| 2664 | }; |
| 2665 | } |
| 2523 | 2666 | |
| 2524 | | if (self.text_section_index == null) { |
| 2525 | | const text_seg = &self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 2526 | | self.text_section_index = @intCast(u16, text_seg.sections.items.len); |
| 2527 | | const alignment: u2 = switch (self.base.options.target.cpu.arch) { |
| 2528 | | .x86_64 => 0, |
| 2529 | | .aarch64 => 2, |
| 2530 | | else => unreachable, // unhandled architecture type |
| 2531 | | }; |
| 2532 | | try text_seg.addSection(self.base.allocator, "__text", .{ |
| 2533 | | .@"align" = alignment, |
| 2534 | | .flags = macho.S_REGULAR | macho.S_ATTR_PURE_INSTRUCTIONS | macho.S_ATTR_SOME_INSTRUCTIONS, |
| 2535 | | }); |
| 2536 | | _ = try self.section_ordinals.getOrPut(self.base.allocator, .{ |
| 2537 | | .seg = self.text_segment_cmd_index.?, |
| 2538 | | .sect = self.text_section_index.?, |
| 2539 | | }); |
| 2540 | | } |
| 2667 | while (true) { |
| 2668 | const alignment = try math.powi(u32, 2, atom.alignment); |
| 2669 | metadata.value_ptr.size += mem.alignForwardGeneric(u64, atom.size, alignment); |
| 2670 | metadata.value_ptr.alignment = math.max(metadata.value_ptr.alignment, atom.alignment); |
| 2541 | 2671 | |
| 2542 | | if (self.stubs_section_index == null) { |
| 2543 | | const text_seg = &self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 2544 | | self.stubs_section_index = @intCast(u16, text_seg.sections.items.len); |
| 2545 | | const alignment: u2 = switch (self.base.options.target.cpu.arch) { |
| 2546 | | .x86_64 => 0, |
| 2547 | | .aarch64 => 2, |
| 2548 | | else => unreachable, // unhandled architecture type |
| 2549 | | }; |
| 2550 | | const stub_size: u4 = switch (self.base.options.target.cpu.arch) { |
| 2551 | | .x86_64 => 6, |
| 2552 | | .aarch64 => 3 * @sizeOf(u32), |
| 2553 | | else => unreachable, // unhandled architecture type |
| 2554 | | }; |
| 2555 | | try text_seg.addSection(self.base.allocator, "__stubs", .{ |
| 2556 | | .@"align" = alignment, |
| 2557 | | .flags = macho.S_SYMBOL_STUBS | macho.S_ATTR_PURE_INSTRUCTIONS | macho.S_ATTR_SOME_INSTRUCTIONS, |
| 2558 | | .reserved2 = stub_size, |
| 2559 | | }); |
| 2560 | | _ = try self.section_ordinals.getOrPut(self.base.allocator, .{ |
| 2561 | | .seg = self.text_segment_cmd_index.?, |
| 2562 | | .sect = self.stubs_section_index.?, |
| 2563 | | }); |
| 2564 | | } |
| 2672 | const sym = self.locals.items[atom.local_sym_index]; |
| 2673 | log.debug(" {s}: n_value=0x{x}, size=0x{x}, alignment=0x{x}", .{ |
| 2674 | self.getString(sym.n_strx), |
| 2675 | sym.n_value, |
| 2676 | atom.size, |
| 2677 | atom.alignment, |
| 2678 | }); |
| 2565 | 2679 | |
| 2566 | | if (self.stub_helper_section_index == null) { |
| 2567 | | const text_seg = &self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 2568 | | self.stub_helper_section_index = @intCast(u16, text_seg.sections.items.len); |
| 2569 | | const alignment: u2 = switch (self.base.options.target.cpu.arch) { |
| 2570 | | .x86_64 => 0, |
| 2571 | | .aarch64 => 2, |
| 2572 | | else => unreachable, // unhandled architecture type |
| 2573 | | }; |
| 2574 | | const stub_helper_size: u6 = switch (self.base.options.target.cpu.arch) { |
| 2575 | | .x86_64 => 15, |
| 2576 | | .aarch64 => 6 * @sizeOf(u32), |
| 2577 | | else => unreachable, |
| 2578 | | }; |
| 2579 | | try text_seg.addSection(self.base.allocator, "__stub_helper", .{ |
| 2580 | | .size = stub_helper_size, |
| 2581 | | .@"align" = alignment, |
| 2582 | | .flags = macho.S_REGULAR | macho.S_ATTR_PURE_INSTRUCTIONS | macho.S_ATTR_SOME_INSTRUCTIONS, |
| 2583 | | }); |
| 2584 | | _ = try self.section_ordinals.getOrPut(self.base.allocator, .{ |
| 2585 | | .seg = self.text_segment_cmd_index.?, |
| 2586 | | .sect = self.stub_helper_section_index.?, |
| 2587 | | }); |
| 2588 | | } |
| 2680 | if (atom.prev) |prev| { |
| 2681 | atom = prev; |
| 2682 | } else break; |
| 2683 | } |
| 2589 | 2684 | |
| 2590 | | if (self.data_const_segment_cmd_index == null) { |
| 2591 | | self.data_const_segment_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 2592 | | try self.load_commands.append(self.base.allocator, .{ |
| 2593 | | .Segment = SegmentCommand.empty("__DATA_CONST", .{ |
| 2594 | | .maxprot = macho.VM_PROT_READ | macho.VM_PROT_WRITE, |
| 2595 | | .initprot = macho.VM_PROT_READ | macho.VM_PROT_WRITE, |
| 2596 | | }), |
| 2597 | | }); |
| 2598 | | } |
| 2685 | if (parsed_atoms.getPtr(match)) |last| { |
| 2686 | last.*.next = atom; |
| 2687 | atom.prev = last.*; |
| 2688 | last.* = atom; |
| 2689 | } |
| 2690 | _ = try parsed_atoms.put(match, last_atom); |
| 2599 | 2691 | |
| 2600 | | if (self.got_section_index == null) { |
| 2601 | | const data_const_seg = &self.load_commands.items[self.data_const_segment_cmd_index.?].Segment; |
| 2602 | | self.got_section_index = @intCast(u16, data_const_seg.sections.items.len); |
| 2603 | | try data_const_seg.addSection(self.base.allocator, "__got", .{ |
| 2604 | | .@"align" = 3, // 2^3 = @sizeOf(u64) |
| 2605 | | .flags = macho.S_NON_LAZY_SYMBOL_POINTERS, |
| 2606 | | }); |
| 2607 | | _ = try self.section_ordinals.getOrPut(self.base.allocator, .{ |
| 2608 | | .seg = self.data_const_segment_cmd_index.?, |
| 2609 | | .sect = self.got_section_index.?, |
| 2610 | | }); |
| 2611 | | } |
| 2692 | if (!first_atoms.contains(match)) { |
| 2693 | try first_atoms.putNoClobber(match, atom); |
| 2694 | } |
| 2695 | } |
| 2612 | 2696 | |
| 2613 | | if (self.data_segment_cmd_index == null) { |
| 2614 | | self.data_segment_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 2615 | | try self.load_commands.append(self.base.allocator, .{ |
| 2616 | | .Segment = SegmentCommand.empty("__DATA", .{ |
| 2617 | | .maxprot = macho.VM_PROT_READ | macho.VM_PROT_WRITE, |
| 2618 | | .initprot = macho.VM_PROT_READ | macho.VM_PROT_WRITE, |
| 2619 | | }), |
| 2620 | | }); |
| 2697 | object.analyzed = true; |
| 2621 | 2698 | } |
| 2622 | 2699 | |
| 2623 | | if (self.la_symbol_ptr_section_index == null) { |
| 2624 | | const data_seg = &self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 2625 | | self.la_symbol_ptr_section_index = @intCast(u16, data_seg.sections.items.len); |
| 2626 | | try data_seg.addSection(self.base.allocator, "__la_symbol_ptr", .{ |
| 2627 | | .@"align" = 3, // 2^3 = @sizeOf(u64) |
| 2628 | | .flags = macho.S_LAZY_SYMBOL_POINTERS, |
| 2629 | | }); |
| 2630 | | _ = try self.section_ordinals.getOrPut(self.base.allocator, .{ |
| 2631 | | .seg = self.data_segment_cmd_index.?, |
| 2632 | | .sect = self.la_symbol_ptr_section_index.?, |
| 2700 | var it = section_metadata.iterator(); |
| 2701 | while (it.next()) |entry| { |
| 2702 | const match = entry.key_ptr.*; |
| 2703 | const metadata = entry.value_ptr.*; |
| 2704 | const seg = &self.load_commands.items[match.seg].Segment; |
| 2705 | const sect = &seg.sections.items[match.sect]; |
| 2706 | log.debug("{s},{s} => size: 0x{x}, alignment: 0x{x}", .{ |
| 2707 | commands.segmentName(sect.*), |
| 2708 | commands.sectionName(sect.*), |
| 2709 | metadata.size, |
| 2710 | metadata.alignment, |
| 2633 | 2711 | }); |
| 2634 | | } |
| 2635 | 2712 | |
| 2636 | | if (self.data_section_index == null) { |
| 2637 | | const data_seg = &self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 2638 | | self.data_section_index = @intCast(u16, data_seg.sections.items.len); |
| 2639 | | try data_seg.addSection(self.base.allocator, "__data", .{ |
| 2640 | | .@"align" = 3, // 2^3 = @sizeOf(u64) |
| 2641 | | }); |
| 2642 | | _ = try self.section_ordinals.getOrPut(self.base.allocator, .{ |
| 2643 | | .seg = self.data_segment_cmd_index.?, |
| 2644 | | .sect = self.data_section_index.?, |
| 2645 | | }); |
| 2646 | | } |
| 2713 | const sect_size = if (self.atoms.get(match)) |last| blk: { |
| 2714 | const last_atom_sym = self.locals.items[last.local_sym_index]; |
| 2715 | break :blk last_atom_sym.n_value + last.size - sect.addr; |
| 2716 | } else 0; |
| 2647 | 2717 | |
| 2648 | | if (self.linkedit_segment_cmd_index == null) { |
| 2649 | | self.linkedit_segment_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 2650 | | try self.load_commands.append(self.base.allocator, .{ |
| 2651 | | .Segment = SegmentCommand.empty("__LINKEDIT", .{ |
| 2652 | | .maxprot = macho.VM_PROT_READ, |
| 2653 | | .initprot = macho.VM_PROT_READ, |
| 2654 | | }), |
| 2655 | | }); |
| 2656 | | } |
| 2718 | sect.@"align" = math.max(sect.@"align", metadata.alignment); |
| 2719 | const needed_size = @intCast(u32, metadata.size + sect_size); |
| 2720 | try self.growSection(match, needed_size); |
| 2721 | sect.size = needed_size; |
| 2657 | 2722 | |
| 2658 | | if (self.dyld_info_cmd_index == null) { |
| 2659 | | self.dyld_info_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 2660 | | try self.load_commands.append(self.base.allocator, .{ |
| 2661 | | .DyldInfoOnly = .{ |
| 2662 | | .cmd = macho.LC_DYLD_INFO_ONLY, |
| 2663 | | .cmdsize = @sizeOf(macho.dyld_info_command), |
| 2664 | | .rebase_off = 0, |
| 2665 | | .rebase_size = 0, |
| 2666 | | .bind_off = 0, |
| 2667 | | .bind_size = 0, |
| 2668 | | .weak_bind_off = 0, |
| 2669 | | .weak_bind_size = 0, |
| 2670 | | .lazy_bind_off = 0, |
| 2671 | | .lazy_bind_size = 0, |
| 2672 | | .export_off = 0, |
| 2673 | | .export_size = 0, |
| 2674 | | }, |
| 2675 | | }); |
| 2676 | | } |
| 2723 | var base_vaddr = if (self.atoms.get(match)) |last| blk: { |
| 2724 | const last_atom_sym = self.locals.items[last.local_sym_index]; |
| 2725 | break :blk last_atom_sym.n_value + last.size; |
| 2726 | } else sect.addr; |
| 2727 | const n_sect = @intCast(u8, self.section_ordinals.getIndex(match).? + 1); |
| 2677 | 2728 | |
| 2678 | | if (self.symtab_cmd_index == null) { |
| 2679 | | self.symtab_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 2680 | | try self.load_commands.append(self.base.allocator, .{ |
| 2681 | | .Symtab = .{ |
| 2682 | | .cmd = macho.LC_SYMTAB, |
| 2683 | | .cmdsize = @sizeOf(macho.symtab_command), |
| 2684 | | .symoff = 0, |
| 2685 | | .nsyms = 0, |
| 2686 | | .stroff = 0, |
| 2687 | | .strsize = 0, |
| 2688 | | }, |
| 2689 | | }); |
| 2729 | var atom = first_atoms.get(match).?; |
| 2730 | while (true) { |
| 2731 | const alignment = try math.powi(u32, 2, atom.alignment); |
| 2732 | base_vaddr = mem.alignForwardGeneric(u64, base_vaddr, alignment); |
| 2733 | |
| 2734 | const sym = &self.locals.items[atom.local_sym_index]; |
| 2735 | sym.n_value = base_vaddr; |
| 2736 | sym.n_sect = n_sect; |
| 2737 | |
| 2738 | log.debug(" {s}: start=0x{x}, end=0x{x}, size=0x{x}, alignment=0x{x}", .{ |
| 2739 | self.getString(sym.n_strx), |
| 2740 | base_vaddr, |
| 2741 | base_vaddr + atom.size, |
| 2742 | atom.size, |
| 2743 | atom.alignment, |
| 2744 | }); |
| 2745 | |
| 2746 | // Update each alias (if any) |
| 2747 | for (atom.aliases.items) |index| { |
| 2748 | const alias_sym = &self.locals.items[index]; |
| 2749 | alias_sym.n_value = base_vaddr; |
| 2750 | alias_sym.n_sect = n_sect; |
| 2751 | } |
| 2752 | |
| 2753 | // Update each symbol contained within the atom |
| 2754 | for (atom.contained.items) |sym_at_off| { |
| 2755 | const contained_sym = &self.locals.items[sym_at_off.local_sym_index]; |
| 2756 | contained_sym.n_value = base_vaddr + sym_at_off.offset; |
| 2757 | contained_sym.n_sect = n_sect; |
| 2758 | } |
| 2759 | |
| 2760 | base_vaddr += atom.size; |
| 2761 | |
| 2762 | if (atom.next) |next| { |
| 2763 | atom = next; |
| 2764 | } else break; |
| 2765 | } |
| 2766 | |
| 2767 | if (self.atoms.getPtr(match)) |last| { |
| 2768 | const first_atom = first_atoms.get(match).?; |
| 2769 | last.*.next = first_atom; |
| 2770 | first_atom.prev = last.*; |
| 2771 | last.* = first_atom; |
| 2772 | } |
| 2773 | _ = try self.atoms.put(self.base.allocator, match, parsed_atoms.get(match).?); |
| 2690 | 2774 | } |
| 2775 | } |
| 2691 | 2776 | |
| 2692 | | if (self.dysymtab_cmd_index == null) { |
| 2693 | | self.dysymtab_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 2694 | | try self.load_commands.append(self.base.allocator, .{ |
| 2695 | | .Dysymtab = .{ |
| 2696 | | .cmd = macho.LC_DYSYMTAB, |
| 2697 | | .cmdsize = @sizeOf(macho.dysymtab_command), |
| 2698 | | .ilocalsym = 0, |
| 2699 | | .nlocalsym = 0, |
| 2700 | | .iextdefsym = 0, |
| 2701 | | .nextdefsym = 0, |
| 2702 | | .iundefsym = 0, |
| 2703 | | .nundefsym = 0, |
| 2704 | | .tocoff = 0, |
| 2705 | | .ntoc = 0, |
| 2706 | | .modtaboff = 0, |
| 2707 | | .nmodtab = 0, |
| 2708 | | .extrefsymoff = 0, |
| 2709 | | .nextrefsyms = 0, |
| 2710 | | .indirectsymoff = 0, |
| 2711 | | .nindirectsyms = 0, |
| 2712 | | .extreloff = 0, |
| 2713 | | .nextrel = 0, |
| 2714 | | .locreloff = 0, |
| 2715 | | .nlocrel = 0, |
| 2716 | | }, |
| 2717 | | }); |
| 2718 | | } |
| 2777 | fn addLoadDylibLC(self: *MachO, id: u16) !void { |
| 2778 | const dylib = self.dylibs.items[id]; |
| 2779 | const dylib_id = dylib.id orelse unreachable; |
| 2780 | var dylib_cmd = try commands.createLoadDylibCommand( |
| 2781 | self.base.allocator, |
| 2782 | dylib_id.name, |
| 2783 | dylib_id.timestamp, |
| 2784 | dylib_id.current_version, |
| 2785 | dylib_id.compatibility_version, |
| 2786 | ); |
| 2787 | errdefer dylib_cmd.deinit(self.base.allocator); |
| 2788 | try self.load_commands.append(self.base.allocator, .{ .Dylib = dylib_cmd }); |
| 2789 | self.load_commands_dirty = true; |
| 2790 | } |
| 2719 | 2791 | |
| 2720 | | if (self.dylinker_cmd_index == null) { |
| 2721 | | self.dylinker_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 2722 | | const cmdsize = @intCast(u32, mem.alignForwardGeneric( |
| 2723 | | u64, |
| 2724 | | @sizeOf(macho.dylinker_command) + mem.lenZ(DEFAULT_DYLD_PATH), |
| 2725 | | @sizeOf(u64), |
| 2726 | | )); |
| 2727 | | var dylinker_cmd = commands.emptyGenericCommandWithData(macho.dylinker_command{ |
| 2728 | | .cmd = macho.LC_LOAD_DYLINKER, |
| 2729 | | .cmdsize = cmdsize, |
| 2730 | | .name = @sizeOf(macho.dylinker_command), |
| 2731 | | }); |
| 2732 | | dylinker_cmd.data = try self.base.allocator.alloc(u8, cmdsize - dylinker_cmd.inner.name); |
| 2733 | | mem.set(u8, dylinker_cmd.data, 0); |
| 2734 | | mem.copy(u8, dylinker_cmd.data, mem.spanZ(DEFAULT_DYLD_PATH)); |
| 2735 | | try self.load_commands.append(self.base.allocator, .{ .Dylinker = dylinker_cmd }); |
| 2736 | | } |
| 2792 | fn addCodeSignatureLC(self: *MachO) !void { |
| 2793 | if (self.code_signature_cmd_index != null or !self.requires_adhoc_codesig) return; |
| 2794 | self.code_signature_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 2795 | try self.load_commands.append(self.base.allocator, .{ |
| 2796 | .LinkeditData = .{ |
| 2797 | .cmd = macho.LC_CODE_SIGNATURE, |
| 2798 | .cmdsize = @sizeOf(macho.linkedit_data_command), |
| 2799 | .dataoff = 0, |
| 2800 | .datasize = 0, |
| 2801 | }, |
| 2802 | }); |
| 2803 | self.load_commands_dirty = true; |
| 2804 | } |
| 2737 | 2805 | |
| 2738 | | if (self.main_cmd_index == null and self.base.options.output_mode == .Exe) { |
| 2739 | | self.main_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 2740 | | try self.load_commands.append(self.base.allocator, .{ |
| 2741 | | .Main = .{ |
| 2742 | | .cmd = macho.LC_MAIN, |
| 2743 | | .cmdsize = @sizeOf(macho.entry_point_command), |
| 2744 | | .entryoff = 0x0, |
| 2745 | | .stacksize = 0, |
| 2746 | | }, |
| 2747 | | }); |
| 2748 | | } |
| 2806 | fn setEntryPoint(self: *MachO) !void { |
| 2807 | if (self.base.options.output_mode != .Exe) return; |
| 2749 | 2808 | |
| 2750 | | if (self.dylib_id_cmd_index == null and self.base.options.output_mode == .Lib) { |
| 2751 | | self.dylib_id_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 2752 | | const install_name = try std.fmt.allocPrint(self.base.allocator, "@rpath/{s}", .{ |
| 2753 | | self.base.options.emit.?.sub_path, |
| 2754 | | }); |
| 2755 | | defer self.base.allocator.free(install_name); |
| 2756 | | var dylib_cmd = try commands.createLoadDylibCommand( |
| 2757 | | self.base.allocator, |
| 2758 | | install_name, |
| 2759 | | 2, |
| 2760 | | 0x10000, // TODO forward user-provided versions |
| 2761 | | 0x10000, |
| 2762 | | ); |
| 2763 | | errdefer dylib_cmd.deinit(self.base.allocator); |
| 2764 | | dylib_cmd.inner.cmd = macho.LC_ID_DYLIB; |
| 2765 | | try self.load_commands.append(self.base.allocator, .{ .Dylib = dylib_cmd }); |
| 2809 | // TODO we should respect the -entry flag passed in by the user to set a custom |
| 2810 | // entrypoint. For now, assume default of `_main`. |
| 2811 | const seg = self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 2812 | const n_strx = self.strtab_dir.getKeyAdapted(@as([]const u8, "_main"), StringIndexAdapter{ |
| 2813 | .bytes = &self.strtab, |
| 2814 | }) orelse { |
| 2815 | log.err("'_main' export not found", .{}); |
| 2816 | return error.MissingMainEntrypoint; |
| 2817 | }; |
| 2818 | const resolv = self.symbol_resolver.get(n_strx) orelse unreachable; |
| 2819 | assert(resolv.where == .global); |
| 2820 | const sym = self.globals.items[resolv.where_index]; |
| 2821 | const ec = &self.load_commands.items[self.main_cmd_index.?].Main; |
| 2822 | ec.entryoff = @intCast(u32, sym.n_value - seg.inner.vmaddr); |
| 2823 | ec.stacksize = self.base.options.stack_size_override orelse 0; |
| 2824 | self.entry_addr = sym.n_value; |
| 2825 | self.load_commands_dirty = true; |
| 2826 | } |
| 2827 | |
| 2828 | pub fn deinit(self: *MachO) void { |
| 2829 | if (build_options.have_llvm) { |
| 2830 | if (self.llvm_object) |llvm_object| llvm_object.destroy(self.base.allocator); |
| 2766 | 2831 | } |
| 2767 | 2832 | |
| 2768 | | if (self.source_version_cmd_index == null) { |
| 2769 | | self.source_version_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 2770 | | try self.load_commands.append(self.base.allocator, .{ |
| 2771 | | .SourceVersion = .{ |
| 2772 | | .cmd = macho.LC_SOURCE_VERSION, |
| 2773 | | .cmdsize = @sizeOf(macho.source_version_command), |
| 2774 | | .version = 0x0, |
| 2775 | | }, |
| 2776 | | }); |
| 2833 | if (self.d_sym) |*ds| { |
| 2834 | ds.deinit(self.base.allocator); |
| 2777 | 2835 | } |
| 2778 | 2836 | |
| 2779 | | if (self.build_version_cmd_index == null) { |
| 2780 | | self.build_version_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 2781 | | const cmdsize = @intCast(u32, mem.alignForwardGeneric( |
| 2782 | | u64, |
| 2783 | | @sizeOf(macho.build_version_command) + @sizeOf(macho.build_tool_version), |
| 2784 | | @sizeOf(u64), |
| 2785 | | )); |
| 2786 | | const ver = self.base.options.target.os.version_range.semver.min; |
| 2787 | | const version = ver.major << 16 | ver.minor << 8 | ver.patch; |
| 2788 | | const is_simulator_abi = self.base.options.target.abi == .simulator; |
| 2789 | | var cmd = commands.emptyGenericCommandWithData(macho.build_version_command{ |
| 2790 | | .cmd = macho.LC_BUILD_VERSION, |
| 2791 | | .cmdsize = cmdsize, |
| 2792 | | .platform = switch (self.base.options.target.os.tag) { |
| 2793 | | .macos => macho.PLATFORM_MACOS, |
| 2794 | | .ios => if (is_simulator_abi) macho.PLATFORM_IOSSIMULATOR else macho.PLATFORM_IOS, |
| 2795 | | .watchos => if (is_simulator_abi) macho.PLATFORM_WATCHOSSIMULATOR else macho.PLATFORM_WATCHOS, |
| 2796 | | .tvos => if (is_simulator_abi) macho.PLATFORM_TVOSSIMULATOR else macho.PLATFORM_TVOS, |
| 2797 | | else => unreachable, |
| 2798 | | }, |
| 2799 | | .minos = version, |
| 2800 | | .sdk = version, |
| 2801 | | .ntools = 1, |
| 2802 | | }); |
| 2803 | | const ld_ver = macho.build_tool_version{ |
| 2804 | | .tool = macho.TOOL_LD, |
| 2805 | | .version = 0x0, |
| 2806 | | }; |
| 2807 | | cmd.data = try self.base.allocator.alloc(u8, cmdsize - @sizeOf(macho.build_version_command)); |
| 2808 | | mem.set(u8, cmd.data, 0); |
| 2809 | | mem.copy(u8, cmd.data, mem.asBytes(&ld_ver)); |
| 2810 | | try self.load_commands.append(self.base.allocator, .{ .BuildVersion = cmd }); |
| 2837 | self.section_ordinals.deinit(self.base.allocator); |
| 2838 | self.got_entries_map.deinit(self.base.allocator); |
| 2839 | self.stubs_map.deinit(self.base.allocator); |
| 2840 | self.strtab_dir.deinit(self.base.allocator); |
| 2841 | self.strtab.deinit(self.base.allocator); |
| 2842 | self.undefs.deinit(self.base.allocator); |
| 2843 | self.globals.deinit(self.base.allocator); |
| 2844 | self.globals_free_list.deinit(self.base.allocator); |
| 2845 | self.locals.deinit(self.base.allocator); |
| 2846 | self.locals_free_list.deinit(self.base.allocator); |
| 2847 | self.symbol_resolver.deinit(self.base.allocator); |
| 2848 | self.unresolved.deinit(self.base.allocator); |
| 2849 | self.tentatives.deinit(self.base.allocator); |
| 2850 | |
| 2851 | for (self.objects.items) |*object| { |
| 2852 | object.deinit(self.base.allocator); |
| 2811 | 2853 | } |
| 2854 | self.objects.deinit(self.base.allocator); |
| 2812 | 2855 | |
| 2813 | | if (self.uuid_cmd_index == null) { |
| 2814 | | self.uuid_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 2815 | | var uuid_cmd: macho.uuid_command = .{ |
| 2816 | | .cmd = macho.LC_UUID, |
| 2817 | | .cmdsize = @sizeOf(macho.uuid_command), |
| 2818 | | .uuid = undefined, |
| 2819 | | }; |
| 2820 | | std.crypto.random.bytes(&uuid_cmd.uuid); |
| 2821 | | try self.load_commands.append(self.base.allocator, .{ .Uuid = uuid_cmd }); |
| 2856 | for (self.archives.items) |*archive| { |
| 2857 | archive.deinit(self.base.allocator); |
| 2822 | 2858 | } |
| 2823 | | } |
| 2859 | self.archives.deinit(self.base.allocator); |
| 2824 | 2860 | |
| 2825 | | fn addDataInCodeLC(self: *MachO) !void { |
| 2826 | | if (self.data_in_code_cmd_index == null) { |
| 2827 | | self.data_in_code_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 2828 | | try self.load_commands.append(self.base.allocator, .{ |
| 2829 | | .LinkeditData = .{ |
| 2830 | | .cmd = macho.LC_DATA_IN_CODE, |
| 2831 | | .cmdsize = @sizeOf(macho.linkedit_data_command), |
| 2832 | | .dataoff = 0, |
| 2833 | | .datasize = 0, |
| 2834 | | }, |
| 2835 | | }); |
| 2861 | for (self.dylibs.items) |*dylib| { |
| 2862 | dylib.deinit(self.base.allocator); |
| 2836 | 2863 | } |
| 2837 | | } |
| 2864 | self.dylibs.deinit(self.base.allocator); |
| 2865 | self.dylibs_map.deinit(self.base.allocator); |
| 2866 | self.referenced_dylibs.deinit(self.base.allocator); |
| 2838 | 2867 | |
| 2839 | | fn addCodeSignatureLC(self: *MachO) !void { |
| 2840 | | if (self.code_signature_cmd_index == null and self.requires_adhoc_codesig) { |
| 2841 | | self.code_signature_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 2842 | | try self.load_commands.append(self.base.allocator, .{ |
| 2843 | | .LinkeditData = .{ |
| 2844 | | .cmd = macho.LC_CODE_SIGNATURE, |
| 2845 | | .cmdsize = @sizeOf(macho.linkedit_data_command), |
| 2846 | | .dataoff = 0, |
| 2847 | | .datasize = 0, |
| 2848 | | }, |
| 2849 | | }); |
| 2868 | for (self.load_commands.items) |*lc| { |
| 2869 | lc.deinit(self.base.allocator); |
| 2850 | 2870 | } |
| 2851 | | } |
| 2871 | self.load_commands.deinit(self.base.allocator); |
| 2852 | 2872 | |
| 2853 | | fn addRpathLCs(self: *MachO, rpaths: []const []const u8) !void { |
| 2854 | | for (rpaths) |rpath| { |
| 2855 | | const cmdsize = @intCast(u32, mem.alignForwardGeneric( |
| 2856 | | u64, |
| 2857 | | @sizeOf(macho.rpath_command) + rpath.len + 1, |
| 2858 | | @sizeOf(u64), |
| 2859 | | )); |
| 2860 | | var rpath_cmd = commands.emptyGenericCommandWithData(macho.rpath_command{ |
| 2861 | | .cmd = macho.LC_RPATH, |
| 2862 | | .cmdsize = cmdsize, |
| 2863 | | .path = @sizeOf(macho.rpath_command), |
| 2864 | | }); |
| 2865 | | rpath_cmd.data = try self.base.allocator.alloc(u8, cmdsize - rpath_cmd.inner.path); |
| 2866 | | mem.set(u8, rpath_cmd.data, 0); |
| 2867 | | mem.copy(u8, rpath_cmd.data, rpath); |
| 2868 | | try self.load_commands.append(self.base.allocator, .{ .Rpath = rpath_cmd }); |
| 2873 | for (self.managed_atoms.items) |atom| { |
| 2874 | atom.deinit(self.base.allocator); |
| 2875 | self.base.allocator.destroy(atom); |
| 2876 | } |
| 2877 | self.managed_atoms.deinit(self.base.allocator); |
| 2878 | self.atoms.deinit(self.base.allocator); |
| 2879 | { |
| 2880 | var it = self.atom_free_lists.valueIterator(); |
| 2881 | while (it.next()) |free_list| { |
| 2882 | free_list.deinit(self.base.allocator); |
| 2883 | } |
| 2884 | self.atom_free_lists.deinit(self.base.allocator); |
| 2885 | } |
| 2886 | for (self.decls.keys()) |decl| { |
| 2887 | decl.link.macho.deinit(self.base.allocator); |
| 2869 | 2888 | } |
| 2889 | self.decls.deinit(self.base.allocator); |
| 2870 | 2890 | } |
| 2871 | 2891 | |
| 2872 | | fn addLoadDylibLCs(self: *MachO) !void { |
| 2873 | | for (self.referenced_dylibs.keys()) |id| { |
| 2874 | | const dylib = self.dylibs.items[id]; |
| 2875 | | const dylib_id = dylib.id orelse unreachable; |
| 2876 | | var dylib_cmd = try commands.createLoadDylibCommand( |
| 2877 | | self.base.allocator, |
| 2878 | | dylib_id.name, |
| 2879 | | dylib_id.timestamp, |
| 2880 | | dylib_id.current_version, |
| 2881 | | dylib_id.compatibility_version, |
| 2882 | | ); |
| 2883 | | errdefer dylib_cmd.deinit(self.base.allocator); |
| 2884 | | try self.load_commands.append(self.base.allocator, .{ .Dylib = dylib_cmd }); |
| 2892 | pub fn closeFiles(self: MachO) void { |
| 2893 | for (self.objects.items) |object| { |
| 2894 | object.file.close(); |
| 2895 | } |
| 2896 | for (self.archives.items) |archive| { |
| 2897 | archive.file.close(); |
| 2898 | } |
| 2899 | for (self.dylibs.items) |dylib| { |
| 2900 | dylib.file.close(); |
| 2885 | 2901 | } |
| 2886 | 2902 | } |
| 2887 | 2903 | |
| 2888 | | fn flushZld(self: *MachO) !void { |
| 2889 | | self.load_commands_dirty = true; |
| 2890 | | try self.writeTextBlocks(); |
| 2891 | | try self.writeStubHelperCommon(); |
| 2904 | fn freeAtom(self: *MachO, atom: *Atom, match: MatchingSection) void { |
| 2905 | log.debug("freeAtom {*}", .{atom}); |
| 2906 | atom.deinit(self.base.allocator); |
| 2892 | 2907 | |
| 2893 | | if (self.common_section_index) |index| { |
| 2894 | | const seg = &self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 2895 | | const sect = &seg.sections.items[index]; |
| 2896 | | sect.offset = 0; |
| 2908 | const free_list = self.atom_free_lists.getPtr(match).?; |
| 2909 | var already_have_free_list_node = false; |
| 2910 | { |
| 2911 | var i: usize = 0; |
| 2912 | // TODO turn free_list into a hash map |
| 2913 | while (i < free_list.items.len) { |
| 2914 | if (free_list.items[i] == atom) { |
| 2915 | _ = free_list.swapRemove(i); |
| 2916 | continue; |
| 2917 | } |
| 2918 | if (free_list.items[i] == atom.prev) { |
| 2919 | already_have_free_list_node = true; |
| 2920 | } |
| 2921 | i += 1; |
| 2922 | } |
| 2897 | 2923 | } |
| 2924 | // TODO process free list for dbg info just like we do above for vaddrs |
| 2898 | 2925 | |
| 2899 | | if (self.bss_section_index) |index| { |
| 2900 | | const seg = &self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 2901 | | const sect = &seg.sections.items[index]; |
| 2902 | | sect.offset = 0; |
| 2926 | if (self.atoms.getPtr(match)) |last_atom| { |
| 2927 | if (last_atom.* == atom) { |
| 2928 | if (atom.prev) |prev| { |
| 2929 | // TODO shrink the section size here |
| 2930 | last_atom.* = prev; |
| 2931 | } else { |
| 2932 | _ = self.atoms.fetchRemove(match); |
| 2933 | } |
| 2934 | } |
| 2903 | 2935 | } |
| 2904 | 2936 | |
| 2905 | | if (self.tlv_bss_section_index) |index| { |
| 2906 | | const seg = &self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 2907 | | const sect = &seg.sections.items[index]; |
| 2908 | | sect.offset = 0; |
| 2937 | if (self.d_sym) |*ds| { |
| 2938 | if (ds.dbg_info_decl_first == atom) { |
| 2939 | ds.dbg_info_decl_first = atom.dbg_info_next; |
| 2940 | } |
| 2941 | if (ds.dbg_info_decl_last == atom) { |
| 2942 | // TODO shrink the .debug_info section size here |
| 2943 | ds.dbg_info_decl_last = atom.dbg_info_prev; |
| 2944 | } |
| 2909 | 2945 | } |
| 2910 | 2946 | |
| 2911 | | try self.writeGotEntries(); |
| 2912 | | try self.setEntryPoint(); |
| 2913 | | try self.writeRebaseInfoTableZld(); |
| 2914 | | try self.writeBindInfoTableZld(); |
| 2915 | | try self.writeLazyBindInfoTableZld(); |
| 2916 | | try self.writeExportInfoZld(); |
| 2917 | | try self.writeDices(); |
| 2947 | if (atom.prev) |prev| { |
| 2948 | prev.next = atom.next; |
| 2918 | 2949 | |
| 2919 | | { |
| 2920 | | const seg = &self.load_commands.items[self.linkedit_segment_cmd_index.?].Segment; |
| 2921 | | const symtab = &self.load_commands.items[self.symtab_cmd_index.?].Symtab; |
| 2922 | | symtab.symoff = @intCast(u32, seg.inner.fileoff + seg.inner.filesize); |
| 2950 | if (!already_have_free_list_node and prev.freeListEligible(self.*)) { |
| 2951 | // The free list is heuristics, it doesn't have to be perfect, so we can ignore |
| 2952 | // the OOM here. |
| 2953 | free_list.append(self.base.allocator, prev) catch {}; |
| 2954 | } |
| 2955 | } else { |
| 2956 | atom.prev = null; |
| 2923 | 2957 | } |
| 2924 | 2958 | |
| 2925 | | try self.writeSymbolTable(); |
| 2926 | | try self.writeStringTableZld(); |
| 2959 | if (atom.next) |next| { |
| 2960 | next.prev = atom.prev; |
| 2961 | } else { |
| 2962 | atom.next = null; |
| 2963 | } |
| 2927 | 2964 | |
| 2928 | | { |
| 2929 | | // Seal __LINKEDIT size |
| 2930 | | const seg = &self.load_commands.items[self.linkedit_segment_cmd_index.?].Segment; |
| 2931 | | seg.inner.vmsize = mem.alignForwardGeneric(u64, seg.inner.filesize, self.page_size); |
| 2965 | if (atom.dbg_info_prev) |prev| { |
| 2966 | prev.dbg_info_next = atom.dbg_info_next; |
| 2967 | |
| 2968 | // TODO the free list logic like we do for atoms above |
| 2969 | } else { |
| 2970 | atom.dbg_info_prev = null; |
| 2932 | 2971 | } |
| 2933 | 2972 | |
| 2934 | | if (self.requires_adhoc_codesig) { |
| 2935 | | try self.writeCodeSignaturePadding(); |
| 2973 | if (atom.dbg_info_next) |next| { |
| 2974 | next.dbg_info_prev = atom.dbg_info_prev; |
| 2975 | } else { |
| 2976 | atom.dbg_info_next = null; |
| 2936 | 2977 | } |
| 2978 | } |
| 2937 | 2979 | |
| 2938 | | try self.writeLoadCommands(); |
| 2939 | | try self.writeHeader(); |
| 2940 | | |
| 2941 | | if (self.requires_adhoc_codesig) { |
| 2942 | | try self.writeCodeSignature(); |
| 2943 | | } |
| 2980 | fn shrinkAtom(self: *MachO, atom: *Atom, new_block_size: u64, match: MatchingSection) void { |
| 2981 | _ = self; |
| 2982 | _ = atom; |
| 2983 | _ = new_block_size; |
| 2984 | _ = match; |
| 2985 | // TODO check the new capacity, and if it crosses the size threshold into a big enough |
| 2986 | // capacity, insert a free list node for it. |
| 2944 | 2987 | } |
| 2945 | 2988 | |
| 2946 | | fn writeGotEntries(self: *MachO) !void { |
| 2947 | | const seg = self.load_commands.items[self.data_const_segment_cmd_index.?].Segment; |
| 2948 | | const sect = seg.sections.items[self.got_section_index.?]; |
| 2989 | fn growAtom(self: *MachO, atom: *Atom, new_atom_size: u64, alignment: u64, match: MatchingSection) !u64 { |
| 2990 | const sym = self.locals.items[atom.local_sym_index]; |
| 2991 | const align_ok = mem.alignBackwardGeneric(u64, sym.n_value, alignment) == sym.n_value; |
| 2992 | const need_realloc = !align_ok or new_atom_size > atom.capacity(self.*); |
| 2993 | if (!need_realloc) return sym.n_value; |
| 2994 | return self.allocateAtom(atom, new_atom_size, alignment, match); |
| 2995 | } |
| 2949 | 2996 | |
| 2950 | | var buffer = try self.base.allocator.alloc(u8, self.got_entries.items.len * @sizeOf(u64)); |
| 2951 | | defer self.base.allocator.free(buffer); |
| 2997 | pub fn allocateDeclIndexes(self: *MachO, decl: *Module.Decl) !void { |
| 2998 | if (decl.link.macho.local_sym_index != 0) return; |
| 2952 | 2999 | |
| 2953 | | var stream = std.io.fixedBufferStream(buffer); |
| 2954 | | var writer = stream.writer(); |
| 3000 | try self.locals.ensureUnusedCapacity(self.base.allocator, 1); |
| 3001 | try self.decls.putNoClobber(self.base.allocator, decl, {}); |
| 2955 | 3002 | |
| 2956 | | for (self.got_entries.items) |key| { |
| 2957 | | const address: u64 = switch (key.where) { |
| 2958 | | .local => self.locals.items[key.where_index].n_value, |
| 2959 | | .undef => 0, |
| 2960 | | }; |
| 2961 | | try writer.writeIntLittle(u64, address); |
| 3003 | if (self.locals_free_list.popOrNull()) |i| { |
| 3004 | log.debug("reusing symbol index {d} for {s}", .{ i, decl.name }); |
| 3005 | decl.link.macho.local_sym_index = i; |
| 3006 | } else { |
| 3007 | log.debug("allocating symbol index {d} for {s}", .{ self.locals.items.len, decl.name }); |
| 3008 | decl.link.macho.local_sym_index = @intCast(u32, self.locals.items.len); |
| 3009 | _ = self.locals.addOneAssumeCapacity(); |
| 2962 | 3010 | } |
| 2963 | 3011 | |
| 2964 | | log.debug("writing GOT pointers at 0x{x} to 0x{x}", .{ sect.offset, sect.offset + buffer.len }); |
| 2965 | | |
| 2966 | | try self.base.file.?.pwriteAll(buffer, sect.offset); |
| 2967 | | } |
| 2968 | | |
| 2969 | | fn setEntryPoint(self: *MachO) !void { |
| 2970 | | if (self.base.options.output_mode != .Exe) return; |
| 3012 | self.locals.items[decl.link.macho.local_sym_index] = .{ |
| 3013 | .n_strx = 0, |
| 3014 | .n_type = 0, |
| 3015 | .n_sect = 0, |
| 3016 | .n_desc = 0, |
| 3017 | .n_value = 0, |
| 3018 | }; |
| 2971 | 3019 | |
| 2972 | | // TODO we should respect the -entry flag passed in by the user to set a custom |
| 2973 | | // entrypoint. For now, assume default of `_main`. |
| 2974 | | const seg = self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 2975 | | const n_strx = self.strtab_dir.getKeyAdapted(@as([]const u8, "_main"), StringIndexAdapter{ |
| 2976 | | .bytes = &self.strtab, |
| 2977 | | }) orelse { |
| 2978 | | log.err("'_main' export not found", .{}); |
| 2979 | | return error.MissingMainEntrypoint; |
| 3020 | // TODO try popping from free list first before allocating a new GOT atom. |
| 3021 | const key = GotIndirectionKey{ |
| 3022 | .where = .local, |
| 3023 | .where_index = decl.link.macho.local_sym_index, |
| 2980 | 3024 | }; |
| 2981 | | const resolv = self.symbol_resolver.get(n_strx) orelse unreachable; |
| 2982 | | assert(resolv.where == .global); |
| 2983 | | const sym = self.globals.items[resolv.where_index]; |
| 2984 | | const ec = &self.load_commands.items[self.main_cmd_index.?].Main; |
| 2985 | | ec.entryoff = @intCast(u32, sym.n_value - seg.inner.vmaddr); |
| 2986 | | ec.stacksize = self.base.options.stack_size_override orelse 0; |
| 3025 | const got_atom = try self.createGotAtom(key); |
| 3026 | try self.got_entries_map.put(self.base.allocator, key, got_atom); |
| 2987 | 3027 | } |
| 2988 | 3028 | |
| 2989 | | fn writeRebaseInfoTableZld(self: *MachO) !void { |
| 2990 | | var pointers = std.ArrayList(bind.Pointer).init(self.base.allocator); |
| 2991 | | defer pointers.deinit(); |
| 2992 | | |
| 2993 | | { |
| 2994 | | var it = self.blocks.iterator(); |
| 2995 | | while (it.next()) |entry| { |
| 2996 | | const match = entry.key_ptr.*; |
| 2997 | | var block: *TextBlock = entry.value_ptr.*; |
| 2998 | | |
| 2999 | | if (match.seg == self.text_segment_cmd_index.?) continue; // __TEXT is non-writable |
| 3000 | | |
| 3001 | | const seg = self.load_commands.items[match.seg].Segment; |
| 3029 | pub fn updateFunc(self: *MachO, module: *Module, func: *Module.Fn, air: Air, liveness: Liveness) !void { |
| 3030 | if (build_options.skip_non_native and builtin.object_format != .macho) { |
| 3031 | @panic("Attempted to compile for object format that was disabled by build configuration"); |
| 3032 | } |
| 3033 | if (build_options.have_llvm) { |
| 3034 | if (self.llvm_object) |llvm_object| return llvm_object.updateFunc(module, func, air, liveness); |
| 3035 | } |
| 3036 | const tracy = trace(@src()); |
| 3037 | defer tracy.end(); |
| 3002 | 3038 | |
| 3003 | | while (true) { |
| 3004 | | const sym = self.locals.items[block.local_sym_index]; |
| 3005 | | const base_offset = sym.n_value - seg.inner.vmaddr; |
| 3039 | const decl = func.owner_decl; |
| 3040 | // TODO clearing the code and relocs buffer should probably be orchestrated |
| 3041 | // in a different, smarter, more automatic way somewhere else, in a more centralised |
| 3042 | // way than this. |
| 3043 | // If we don't clear the buffers here, we are up for some nasty surprises when |
| 3044 | // this atom is reused later on and was not freed by freeAtom(). |
| 3045 | decl.link.macho.clearRetainingCapacity(); |
| 3006 | 3046 | |
| 3007 | | for (block.rebases.items) |offset| { |
| 3008 | | try pointers.append(.{ |
| 3009 | | .offset = base_offset + offset, |
| 3010 | | .segment_id = match.seg, |
| 3011 | | }); |
| 3012 | | } |
| 3047 | var code_buffer = std.ArrayList(u8).init(self.base.allocator); |
| 3048 | defer code_buffer.deinit(); |
| 3013 | 3049 | |
| 3014 | | if (block.prev) |prev| { |
| 3015 | | block = prev; |
| 3016 | | } else break; |
| 3050 | var debug_buffers_buf: DebugSymbols.DeclDebugBuffers = undefined; |
| 3051 | const debug_buffers = if (self.d_sym) |*ds| blk: { |
| 3052 | debug_buffers_buf = try ds.initDeclDebugBuffers(self.base.allocator, module, decl); |
| 3053 | break :blk &debug_buffers_buf; |
| 3054 | } else null; |
| 3055 | defer { |
| 3056 | if (debug_buffers) |dbg| { |
| 3057 | dbg.dbg_line_buffer.deinit(); |
| 3058 | dbg.dbg_info_buffer.deinit(); |
| 3059 | var it = dbg.dbg_info_type_relocs.valueIterator(); |
| 3060 | while (it.next()) |value| { |
| 3061 | value.relocs.deinit(self.base.allocator); |
| 3017 | 3062 | } |
| 3063 | dbg.dbg_info_type_relocs.deinit(self.base.allocator); |
| 3018 | 3064 | } |
| 3019 | 3065 | } |
| 3020 | 3066 | |
| 3021 | | if (self.got_section_index) |idx| { |
| 3022 | | const seg = self.load_commands.items[self.data_const_segment_cmd_index.?].Segment; |
| 3023 | | const sect = seg.sections.items[idx]; |
| 3024 | | const base_offset = sect.addr - seg.inner.vmaddr; |
| 3025 | | const segment_id = @intCast(u16, self.data_const_segment_cmd_index.?); |
| 3026 | | |
| 3027 | | for (self.got_entries.items) |entry, i| { |
| 3028 | | if (entry.where == .undef) continue; |
| 3029 | | |
| 3030 | | try pointers.append(.{ |
| 3031 | | .offset = base_offset + i * @sizeOf(u64), |
| 3032 | | .segment_id = segment_id, |
| 3033 | | }); |
| 3034 | | } |
| 3035 | | } |
| 3067 | self.active_decl = decl; |
| 3036 | 3068 | |
| 3037 | | if (self.la_symbol_ptr_section_index) |idx| { |
| 3038 | | const seg = self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 3039 | | const sect = seg.sections.items[idx]; |
| 3040 | | const base_offset = sect.addr - seg.inner.vmaddr; |
| 3041 | | const segment_id = @intCast(u16, self.data_segment_cmd_index.?); |
| 3042 | | |
| 3043 | | try pointers.ensureUnusedCapacity(self.stubs.items.len); |
| 3044 | | for (self.stubs.items) |_, i| { |
| 3045 | | pointers.appendAssumeCapacity(.{ |
| 3046 | | .offset = base_offset + i * @sizeOf(u64), |
| 3047 | | .segment_id = segment_id, |
| 3048 | | }); |
| 3049 | | } |
| 3069 | const res = if (debug_buffers) |dbg| |
| 3070 | try codegen.generateFunction(&self.base, decl.srcLoc(), func, air, liveness, &code_buffer, .{ |
| 3071 | .dwarf = .{ |
| 3072 | .dbg_line = &dbg.dbg_line_buffer, |
| 3073 | .dbg_info = &dbg.dbg_info_buffer, |
| 3074 | .dbg_info_type_relocs = &dbg.dbg_info_type_relocs, |
| 3075 | }, |
| 3076 | }) |
| 3077 | else |
| 3078 | try codegen.generateFunction(&self.base, decl.srcLoc(), func, air, liveness, &code_buffer, .none); |
| 3079 | switch (res) { |
| 3080 | .appended => { |
| 3081 | try decl.link.macho.code.appendSlice(self.base.allocator, code_buffer.items); |
| 3082 | }, |
| 3083 | .fail => |em| { |
| 3084 | decl.analysis = .codegen_failure; |
| 3085 | try module.failed_decls.put(module.gpa, decl, em); |
| 3086 | return; |
| 3087 | }, |
| 3050 | 3088 | } |
| 3051 | 3089 | |
| 3052 | | std.sort.sort(bind.Pointer, pointers.items, {}, bind.pointerCmp); |
| 3053 | | |
| 3054 | | const size = try bind.rebaseInfoSize(pointers.items); |
| 3055 | | var buffer = try self.base.allocator.alloc(u8, @intCast(usize, size)); |
| 3056 | | defer self.base.allocator.free(buffer); |
| 3057 | | |
| 3058 | | var stream = std.io.fixedBufferStream(buffer); |
| 3059 | | try bind.writeRebaseInfo(pointers.items, stream.writer()); |
| 3060 | | |
| 3061 | | const seg = &self.load_commands.items[self.linkedit_segment_cmd_index.?].Segment; |
| 3062 | | const dyld_info = &self.load_commands.items[self.dyld_info_cmd_index.?].DyldInfoOnly; |
| 3063 | | dyld_info.rebase_off = @intCast(u32, seg.inner.fileoff); |
| 3064 | | dyld_info.rebase_size = @intCast(u32, mem.alignForwardGeneric(u64, buffer.len, @sizeOf(u64))); |
| 3065 | | seg.inner.filesize += dyld_info.rebase_size; |
| 3090 | _ = try self.placeDecl(decl, decl.link.macho.code.items.len); |
| 3066 | 3091 | |
| 3067 | | log.debug("writing rebase info from 0x{x} to 0x{x}", .{ dyld_info.rebase_off, dyld_info.rebase_off + dyld_info.rebase_size }); |
| 3092 | if (debug_buffers) |db| { |
| 3093 | try self.d_sym.?.commitDeclDebugInfo( |
| 3094 | self.base.allocator, |
| 3095 | module, |
| 3096 | decl, |
| 3097 | db, |
| 3098 | self.base.options.target, |
| 3099 | ); |
| 3100 | } |
| 3068 | 3101 | |
| 3069 | | try self.base.file.?.pwriteAll(buffer, dyld_info.rebase_off); |
| 3102 | // Since we updated the vaddr and the size, each corresponding export symbol also |
| 3103 | // needs to be updated. |
| 3104 | const decl_exports = module.decl_exports.get(decl) orelse &[0]*Module.Export{}; |
| 3105 | try self.updateDeclExports(module, decl, decl_exports); |
| 3070 | 3106 | } |
| 3071 | 3107 | |
| 3072 | | fn writeBindInfoTableZld(self: *MachO) !void { |
| 3073 | | var pointers = std.ArrayList(bind.Pointer).init(self.base.allocator); |
| 3074 | | defer pointers.deinit(); |
| 3075 | | |
| 3076 | | if (self.got_section_index) |idx| { |
| 3077 | | const seg = self.load_commands.items[self.data_const_segment_cmd_index.?].Segment; |
| 3078 | | const sect = seg.sections.items[idx]; |
| 3079 | | const base_offset = sect.addr - seg.inner.vmaddr; |
| 3080 | | const segment_id = @intCast(u16, self.data_const_segment_cmd_index.?); |
| 3081 | | |
| 3082 | | for (self.got_entries.items) |entry, i| { |
| 3083 | | if (entry.where == .local) continue; |
| 3084 | | |
| 3085 | | const sym = self.undefs.items[entry.where_index]; |
| 3086 | | try pointers.append(.{ |
| 3087 | | .offset = base_offset + i * @sizeOf(u64), |
| 3088 | | .segment_id = segment_id, |
| 3089 | | .dylib_ordinal = @divExact(sym.n_desc, macho.N_SYMBOL_RESOLVER), |
| 3090 | | .name = self.getString(sym.n_strx), |
| 3091 | | }); |
| 3092 | | } |
| 3108 | pub fn updateDecl(self: *MachO, module: *Module, decl: *Module.Decl) !void { |
| 3109 | if (build_options.skip_non_native and builtin.object_format != .macho) { |
| 3110 | @panic("Attempted to compile for object format that was disabled by build configuration"); |
| 3093 | 3111 | } |
| 3112 | if (build_options.have_llvm) { |
| 3113 | if (self.llvm_object) |llvm_object| return llvm_object.updateDecl(module, decl); |
| 3114 | } |
| 3115 | const tracy = trace(@src()); |
| 3116 | defer tracy.end(); |
| 3094 | 3117 | |
| 3095 | | { |
| 3096 | | var it = self.blocks.iterator(); |
| 3097 | | while (it.next()) |entry| { |
| 3098 | | const match = entry.key_ptr.*; |
| 3099 | | var block: *TextBlock = entry.value_ptr.*; |
| 3100 | | |
| 3101 | | if (match.seg == self.text_segment_cmd_index.?) continue; // __TEXT is non-writable |
| 3102 | | |
| 3103 | | const seg = self.load_commands.items[match.seg].Segment; |
| 3104 | | |
| 3105 | | while (true) { |
| 3106 | | const sym = self.locals.items[block.local_sym_index]; |
| 3107 | | const base_offset = sym.n_value - seg.inner.vmaddr; |
| 3118 | if (decl.val.tag() == .extern_fn) { |
| 3119 | return; // TODO Should we do more when front-end analyzed extern decl? |
| 3120 | } |
| 3108 | 3121 | |
| 3109 | | for (block.bindings.items) |binding| { |
| 3110 | | const bind_sym = self.undefs.items[binding.local_sym_index]; |
| 3111 | | try pointers.append(.{ |
| 3112 | | .offset = binding.offset + base_offset, |
| 3113 | | .segment_id = match.seg, |
| 3114 | | .dylib_ordinal = @divExact(bind_sym.n_desc, macho.N_SYMBOL_RESOLVER), |
| 3115 | | .name = self.getString(bind_sym.n_strx), |
| 3116 | | }); |
| 3117 | | } |
| 3122 | var code_buffer = std.ArrayList(u8).init(self.base.allocator); |
| 3123 | defer code_buffer.deinit(); |
| 3118 | 3124 | |
| 3119 | | if (block.prev) |prev| { |
| 3120 | | block = prev; |
| 3121 | | } else break; |
| 3125 | var debug_buffers_buf: DebugSymbols.DeclDebugBuffers = undefined; |
| 3126 | const debug_buffers = if (self.d_sym) |*ds| blk: { |
| 3127 | debug_buffers_buf = try ds.initDeclDebugBuffers(self.base.allocator, module, decl); |
| 3128 | break :blk &debug_buffers_buf; |
| 3129 | } else null; |
| 3130 | defer { |
| 3131 | if (debug_buffers) |dbg| { |
| 3132 | dbg.dbg_line_buffer.deinit(); |
| 3133 | dbg.dbg_info_buffer.deinit(); |
| 3134 | var it = dbg.dbg_info_type_relocs.valueIterator(); |
| 3135 | while (it.next()) |value| { |
| 3136 | value.relocs.deinit(self.base.allocator); |
| 3122 | 3137 | } |
| 3138 | dbg.dbg_info_type_relocs.deinit(self.base.allocator); |
| 3123 | 3139 | } |
| 3124 | 3140 | } |
| 3125 | 3141 | |
| 3126 | | const size = try bind.bindInfoSize(pointers.items); |
| 3127 | | var buffer = try self.base.allocator.alloc(u8, @intCast(usize, size)); |
| 3128 | | defer self.base.allocator.free(buffer); |
| 3129 | | |
| 3130 | | var stream = std.io.fixedBufferStream(buffer); |
| 3131 | | try bind.writeBindInfo(pointers.items, stream.writer()); |
| 3142 | self.active_decl = decl; |
| 3132 | 3143 | |
| 3133 | | const seg = &self.load_commands.items[self.linkedit_segment_cmd_index.?].Segment; |
| 3134 | | const dyld_info = &self.load_commands.items[self.dyld_info_cmd_index.?].DyldInfoOnly; |
| 3135 | | dyld_info.bind_off = @intCast(u32, seg.inner.fileoff + seg.inner.filesize); |
| 3136 | | dyld_info.bind_size = @intCast(u32, mem.alignForwardGeneric(u64, buffer.len, @alignOf(u64))); |
| 3137 | | seg.inner.filesize += dyld_info.bind_size; |
| 3144 | const res = if (debug_buffers) |dbg| |
| 3145 | try codegen.generateSymbol(&self.base, decl.srcLoc(), .{ |
| 3146 | .ty = decl.ty, |
| 3147 | .val = decl.val, |
| 3148 | }, &code_buffer, .{ |
| 3149 | .dwarf = .{ |
| 3150 | .dbg_line = &dbg.dbg_line_buffer, |
| 3151 | .dbg_info = &dbg.dbg_info_buffer, |
| 3152 | .dbg_info_type_relocs = &dbg.dbg_info_type_relocs, |
| 3153 | }, |
| 3154 | }) |
| 3155 | else |
| 3156 | try codegen.generateSymbol(&self.base, decl.srcLoc(), .{ |
| 3157 | .ty = decl.ty, |
| 3158 | .val = decl.val, |
| 3159 | }, &code_buffer, .none); |
| 3138 | 3160 | |
| 3139 | | log.debug("writing binding info from 0x{x} to 0x{x}", .{ dyld_info.bind_off, dyld_info.bind_off + dyld_info.bind_size }); |
| 3161 | const code = blk: { |
| 3162 | switch (res) { |
| 3163 | .externally_managed => |x| break :blk x, |
| 3164 | .appended => { |
| 3165 | // TODO clearing the code and relocs buffer should probably be orchestrated |
| 3166 | // in a different, smarter, more automatic way somewhere else, in a more centralised |
| 3167 | // way than this. |
| 3168 | // If we don't clear the buffers here, we are up for some nasty surprises when |
| 3169 | // this atom is reused later on and was not freed by freeAtom(). |
| 3170 | decl.link.macho.code.clearAndFree(self.base.allocator); |
| 3171 | try decl.link.macho.code.appendSlice(self.base.allocator, code_buffer.items); |
| 3172 | break :blk decl.link.macho.code.items; |
| 3173 | }, |
| 3174 | .fail => |em| { |
| 3175 | decl.analysis = .codegen_failure; |
| 3176 | try module.failed_decls.put(module.gpa, decl, em); |
| 3177 | return; |
| 3178 | }, |
| 3179 | } |
| 3180 | }; |
| 3181 | _ = try self.placeDecl(decl, code.len); |
| 3140 | 3182 | |
| 3141 | | try self.base.file.?.pwriteAll(buffer, dyld_info.bind_off); |
| 3183 | // Since we updated the vaddr and the size, each corresponding export symbol also |
| 3184 | // needs to be updated. |
| 3185 | const decl_exports = module.decl_exports.get(decl) orelse &[0]*Module.Export{}; |
| 3186 | try self.updateDeclExports(module, decl, decl_exports); |
| 3142 | 3187 | } |
| 3143 | 3188 | |
| 3144 | | fn writeLazyBindInfoTableZld(self: *MachO) !void { |
| 3145 | | var pointers = std.ArrayList(bind.Pointer).init(self.base.allocator); |
| 3146 | | defer pointers.deinit(); |
| 3189 | fn placeDecl(self: *MachO, decl: *Module.Decl, code_len: usize) !*macho.nlist_64 { |
| 3190 | const required_alignment = decl.ty.abiAlignment(self.base.options.target); |
| 3191 | assert(decl.link.macho.local_sym_index != 0); // Caller forgot to call allocateDeclIndexes() |
| 3192 | const symbol = &self.locals.items[decl.link.macho.local_sym_index]; |
| 3147 | 3193 | |
| 3148 | | if (self.la_symbol_ptr_section_index) |idx| { |
| 3149 | | const seg = self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 3150 | | const sect = seg.sections.items[idx]; |
| 3151 | | const base_offset = sect.addr - seg.inner.vmaddr; |
| 3152 | | const segment_id = @intCast(u16, self.data_segment_cmd_index.?); |
| 3153 | | |
| 3154 | | try pointers.ensureUnusedCapacity(self.stubs.items.len); |
| 3155 | | |
| 3156 | | for (self.stubs.items) |import_id, i| { |
| 3157 | | const sym = self.undefs.items[import_id]; |
| 3158 | | pointers.appendAssumeCapacity(.{ |
| 3159 | | .offset = base_offset + i * @sizeOf(u64), |
| 3160 | | .segment_id = segment_id, |
| 3161 | | .dylib_ordinal = @divExact(sym.n_desc, macho.N_SYMBOL_RESOLVER), |
| 3162 | | .name = self.getString(sym.n_strx), |
| 3194 | if (decl.link.macho.size != 0) { |
| 3195 | const capacity = decl.link.macho.capacity(self.*); |
| 3196 | const need_realloc = code_len > capacity or !mem.isAlignedGeneric(u64, symbol.n_value, required_alignment); |
| 3197 | if (need_realloc) { |
| 3198 | const vaddr = try self.growAtom(&decl.link.macho, code_len, required_alignment, .{ |
| 3199 | .seg = self.text_segment_cmd_index.?, |
| 3200 | .sect = self.text_section_index.?, |
| 3163 | 3201 | }); |
| 3164 | | } |
| 3165 | | } |
| 3166 | | |
| 3167 | | const size = try bind.lazyBindInfoSize(pointers.items); |
| 3168 | | var buffer = try self.base.allocator.alloc(u8, @intCast(usize, size)); |
| 3169 | | defer self.base.allocator.free(buffer); |
| 3170 | 3202 | |
| 3171 | | var stream = std.io.fixedBufferStream(buffer); |
| 3172 | | try bind.writeLazyBindInfo(pointers.items, stream.writer()); |
| 3203 | log.debug("growing {s} and moving from 0x{x} to 0x{x}", .{ decl.name, symbol.n_value, vaddr }); |
| 3173 | 3204 | |
| 3174 | | const seg = &self.load_commands.items[self.linkedit_segment_cmd_index.?].Segment; |
| 3175 | | const dyld_info = &self.load_commands.items[self.dyld_info_cmd_index.?].DyldInfoOnly; |
| 3176 | | dyld_info.lazy_bind_off = @intCast(u32, seg.inner.fileoff + seg.inner.filesize); |
| 3177 | | dyld_info.lazy_bind_size = @intCast(u32, mem.alignForwardGeneric(u64, buffer.len, @alignOf(u64))); |
| 3178 | | seg.inner.filesize += dyld_info.lazy_bind_size; |
| 3205 | if (vaddr != symbol.n_value) { |
| 3206 | log.debug(" (writing new GOT entry)", .{}); |
| 3207 | const got_atom = self.got_entries_map.get(.{ |
| 3208 | .where = .local, |
| 3209 | .where_index = decl.link.macho.local_sym_index, |
| 3210 | }) orelse unreachable; |
| 3211 | const got_sym = &self.locals.items[got_atom.local_sym_index]; |
| 3212 | const got_vaddr = try self.allocateAtom(got_atom, @sizeOf(u64), 8, .{ |
| 3213 | .seg = self.data_const_segment_cmd_index.?, |
| 3214 | .sect = self.got_section_index.?, |
| 3215 | }); |
| 3216 | got_sym.n_value = got_vaddr; |
| 3217 | got_sym.n_sect = @intCast(u8, self.section_ordinals.getIndex(.{ |
| 3218 | .seg = self.data_const_segment_cmd_index.?, |
| 3219 | .sect = self.got_section_index.?, |
| 3220 | }).? + 1); |
| 3221 | } |
| 3179 | 3222 | |
| 3180 | | log.debug("writing lazy binding info from 0x{x} to 0x{x}", .{ dyld_info.lazy_bind_off, dyld_info.lazy_bind_off + dyld_info.lazy_bind_size }); |
| 3223 | symbol.n_value = vaddr; |
| 3224 | } else if (code_len < decl.link.macho.size) { |
| 3225 | self.shrinkAtom(&decl.link.macho, code_len, .{ |
| 3226 | .seg = self.text_segment_cmd_index.?, |
| 3227 | .sect = self.text_section_index.?, |
| 3228 | }); |
| 3229 | } |
| 3230 | decl.link.macho.size = code_len; |
| 3231 | decl.link.macho.dirty = true; |
| 3181 | 3232 | |
| 3182 | | try self.base.file.?.pwriteAll(buffer, dyld_info.lazy_bind_off); |
| 3183 | | try self.populateLazyBindOffsetsInStubHelper(buffer); |
| 3184 | | } |
| 3233 | const new_name = try std.fmt.allocPrint(self.base.allocator, "_{s}", .{mem.spanZ(decl.name)}); |
| 3234 | defer self.base.allocator.free(new_name); |
| 3185 | 3235 | |
| 3186 | | fn writeExportInfoZld(self: *MachO) !void { |
| 3187 | | var trie: Trie = .{}; |
| 3188 | | defer trie.deinit(self.base.allocator); |
| 3236 | symbol.n_strx = try self.makeString(new_name); |
| 3237 | symbol.n_type = macho.N_SECT; |
| 3238 | symbol.n_sect = @intCast(u8, self.text_section_index.?) + 1; |
| 3239 | symbol.n_desc = 0; |
| 3240 | } else { |
| 3241 | const decl_name = try std.fmt.allocPrint(self.base.allocator, "_{s}", .{mem.spanZ(decl.name)}); |
| 3242 | defer self.base.allocator.free(decl_name); |
| 3189 | 3243 | |
| 3190 | | const text_segment = self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 3191 | | const base_address = text_segment.inner.vmaddr; |
| 3244 | const name_str_index = try self.makeString(decl_name); |
| 3245 | const addr = try self.allocateAtom(&decl.link.macho, code_len, required_alignment, .{ |
| 3246 | .seg = self.text_segment_cmd_index.?, |
| 3247 | .sect = self.text_section_index.?, |
| 3248 | }); |
| 3192 | 3249 | |
| 3193 | | // TODO handle macho.EXPORT_SYMBOL_FLAGS_REEXPORT and macho.EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER. |
| 3194 | | log.debug("writing export trie", .{}); |
| 3250 | log.debug("allocated atom for {s} at 0x{x}", .{ decl_name, addr }); |
| 3195 | 3251 | |
| 3196 | | for (self.globals.items) |sym| { |
| 3197 | | const sym_name = self.getString(sym.n_strx); |
| 3198 | | log.debug(" | putting '{s}' defined at 0x{x}", .{ sym_name, sym.n_value }); |
| 3252 | errdefer self.freeAtom(&decl.link.macho, .{ |
| 3253 | .seg = self.text_segment_cmd_index.?, |
| 3254 | .sect = self.text_section_index.?, |
| 3255 | }); |
| 3199 | 3256 | |
| 3200 | | try trie.put(self.base.allocator, .{ |
| 3201 | | .name = sym_name, |
| 3202 | | .vmaddr_offset = sym.n_value - base_address, |
| 3203 | | .export_flags = macho.EXPORT_SYMBOL_FLAGS_KIND_REGULAR, |
| 3257 | symbol.* = .{ |
| 3258 | .n_strx = name_str_index, |
| 3259 | .n_type = macho.N_SECT, |
| 3260 | .n_sect = @intCast(u8, self.text_section_index.?) + 1, |
| 3261 | .n_desc = 0, |
| 3262 | .n_value = addr, |
| 3263 | }; |
| 3264 | const got_atom = self.got_entries_map.get(.{ |
| 3265 | .where = .local, |
| 3266 | .where_index = decl.link.macho.local_sym_index, |
| 3267 | }) orelse unreachable; |
| 3268 | const got_sym = &self.locals.items[got_atom.local_sym_index]; |
| 3269 | const vaddr = try self.allocateAtom(got_atom, @sizeOf(u64), 8, .{ |
| 3270 | .seg = self.data_const_segment_cmd_index.?, |
| 3271 | .sect = self.got_section_index.?, |
| 3204 | 3272 | }); |
| 3273 | got_sym.n_value = vaddr; |
| 3274 | got_sym.n_sect = @intCast(u8, self.section_ordinals.getIndex(.{ |
| 3275 | .seg = self.data_const_segment_cmd_index.?, |
| 3276 | .sect = self.got_section_index.?, |
| 3277 | }).? + 1); |
| 3205 | 3278 | } |
| 3206 | 3279 | |
| 3207 | | try trie.finalize(self.base.allocator); |
| 3208 | | |
| 3209 | | var buffer = try self.base.allocator.alloc(u8, @intCast(usize, trie.size)); |
| 3210 | | defer self.base.allocator.free(buffer); |
| 3211 | | |
| 3212 | | var stream = std.io.fixedBufferStream(buffer); |
| 3213 | | const nwritten = try trie.write(stream.writer()); |
| 3214 | | assert(nwritten == trie.size); |
| 3215 | | |
| 3216 | | const seg = &self.load_commands.items[self.linkedit_segment_cmd_index.?].Segment; |
| 3217 | | const dyld_info = &self.load_commands.items[self.dyld_info_cmd_index.?].DyldInfoOnly; |
| 3218 | | dyld_info.export_off = @intCast(u32, seg.inner.fileoff + seg.inner.filesize); |
| 3219 | | dyld_info.export_size = @intCast(u32, mem.alignForwardGeneric(u64, buffer.len, @alignOf(u64))); |
| 3220 | | seg.inner.filesize += dyld_info.export_size; |
| 3221 | | |
| 3222 | | log.debug("writing export info from 0x{x} to 0x{x}", .{ dyld_info.export_off, dyld_info.export_off + dyld_info.export_size }); |
| 3223 | | |
| 3224 | | try self.base.file.?.pwriteAll(buffer, dyld_info.export_off); |
| 3280 | return symbol; |
| 3225 | 3281 | } |
| 3226 | 3282 | |
| 3227 | | fn writeSymbolTable(self: *MachO) !void { |
| 3228 | | const seg = &self.load_commands.items[self.linkedit_segment_cmd_index.?].Segment; |
| 3229 | | const symtab = &self.load_commands.items[self.symtab_cmd_index.?].Symtab; |
| 3283 | pub fn updateDeclLineNumber(self: *MachO, module: *Module, decl: *const Module.Decl) !void { |
| 3284 | if (self.d_sym) |*ds| { |
| 3285 | try ds.updateDeclLineNumber(module, decl); |
| 3286 | } |
| 3287 | } |
| 3230 | 3288 | |
| 3231 | | var locals = std.ArrayList(macho.nlist_64).init(self.base.allocator); |
| 3232 | | defer locals.deinit(); |
| 3233 | | try locals.appendSlice(self.locals.items); |
| 3289 | pub fn updateDeclExports( |
| 3290 | self: *MachO, |
| 3291 | module: *Module, |
| 3292 | decl: *Module.Decl, |
| 3293 | exports: []const *Module.Export, |
| 3294 | ) !void { |
| 3295 | // TODO If we are exporting with global linkage, check for already defined globals and flag |
| 3296 | // symbol duplicate/collision! |
| 3297 | if (build_options.skip_non_native and builtin.object_format != .macho) { |
| 3298 | @panic("Attempted to compile for object format that was disabled by build configuration"); |
| 3299 | } |
| 3300 | if (build_options.have_llvm) { |
| 3301 | if (self.llvm_object) |llvm_object| return llvm_object.updateDeclExports(module, decl, exports); |
| 3302 | } |
| 3303 | const tracy = trace(@src()); |
| 3304 | defer tracy.end(); |
| 3234 | 3305 | |
| 3235 | | if (self.has_stabs) { |
| 3236 | | for (self.objects.items) |object| { |
| 3237 | | if (object.debug_info == null) continue; |
| 3306 | try self.globals.ensureCapacity(self.base.allocator, self.globals.items.len + exports.len); |
| 3307 | if (decl.link.macho.local_sym_index == 0) return; |
| 3308 | const decl_sym = &self.locals.items[decl.link.macho.local_sym_index]; |
| 3238 | 3309 | |
| 3239 | | // Open scope |
| 3240 | | try locals.ensureUnusedCapacity(3); |
| 3241 | | locals.appendAssumeCapacity(.{ |
| 3242 | | .n_strx = try self.makeString(object.tu_comp_dir.?), |
| 3243 | | .n_type = macho.N_SO, |
| 3244 | | .n_sect = 0, |
| 3245 | | .n_desc = 0, |
| 3246 | | .n_value = 0, |
| 3247 | | }); |
| 3248 | | locals.appendAssumeCapacity(.{ |
| 3249 | | .n_strx = try self.makeString(object.tu_name.?), |
| 3250 | | .n_type = macho.N_SO, |
| 3251 | | .n_sect = 0, |
| 3252 | | .n_desc = 0, |
| 3253 | | .n_value = 0, |
| 3254 | | }); |
| 3255 | | locals.appendAssumeCapacity(.{ |
| 3256 | | .n_strx = try self.makeString(object.name), |
| 3257 | | .n_type = macho.N_OSO, |
| 3258 | | .n_sect = 0, |
| 3259 | | .n_desc = 1, |
| 3260 | | .n_value = object.mtime orelse 0, |
| 3261 | | }); |
| 3310 | for (exports) |exp| { |
| 3311 | const exp_name = try std.fmt.allocPrint(self.base.allocator, "_{s}", .{exp.options.name}); |
| 3312 | defer self.base.allocator.free(exp_name); |
| 3262 | 3313 | |
| 3263 | | for (object.text_blocks.items) |block| { |
| 3264 | | if (block.stab) |stab| { |
| 3265 | | const nlists = try stab.asNlists(block.local_sym_index, self); |
| 3266 | | defer self.base.allocator.free(nlists); |
| 3267 | | try locals.appendSlice(nlists); |
| 3268 | | } else { |
| 3269 | | for (block.contained.items) |sym_at_off| { |
| 3270 | | const stab = sym_at_off.stab orelse continue; |
| 3271 | | const nlists = try stab.asNlists(sym_at_off.local_sym_index, self); |
| 3272 | | defer self.base.allocator.free(nlists); |
| 3273 | | try locals.appendSlice(nlists); |
| 3274 | | } |
| 3275 | | } |
| 3314 | if (exp.options.section) |section_name| { |
| 3315 | if (!mem.eql(u8, section_name, "__text")) { |
| 3316 | try module.failed_exports.ensureCapacity(module.gpa, module.failed_exports.count() + 1); |
| 3317 | module.failed_exports.putAssumeCapacityNoClobber( |
| 3318 | exp, |
| 3319 | try Module.ErrorMsg.create(self.base.allocator, decl.srcLoc(), "Unimplemented: ExportOptions.section", .{}), |
| 3320 | ); |
| 3321 | continue; |
| 3276 | 3322 | } |
| 3277 | | |
| 3278 | | // Close scope |
| 3279 | | try locals.append(.{ |
| 3280 | | .n_strx = 0, |
| 3281 | | .n_type = macho.N_SO, |
| 3282 | | .n_sect = 0, |
| 3283 | | .n_desc = 0, |
| 3284 | | .n_value = 0, |
| 3285 | | }); |
| 3286 | 3323 | } |
| 3287 | | } |
| 3288 | | |
| 3289 | | const nlocals = locals.items.len; |
| 3290 | | const nexports = self.globals.items.len; |
| 3291 | | const nundefs = self.undefs.items.len; |
| 3292 | | |
| 3293 | | const locals_off = symtab.symoff + symtab.nsyms * @sizeOf(macho.nlist_64); |
| 3294 | | const locals_size = nlocals * @sizeOf(macho.nlist_64); |
| 3295 | | log.debug("writing local symbols from 0x{x} to 0x{x}", .{ locals_off, locals_size + locals_off }); |
| 3296 | | try self.base.file.?.pwriteAll(mem.sliceAsBytes(locals.items), locals_off); |
| 3297 | | |
| 3298 | | const exports_off = locals_off + locals_size; |
| 3299 | | const exports_size = nexports * @sizeOf(macho.nlist_64); |
| 3300 | | log.debug("writing exported symbols from 0x{x} to 0x{x}", .{ exports_off, exports_size + exports_off }); |
| 3301 | | try self.base.file.?.pwriteAll(mem.sliceAsBytes(self.globals.items), exports_off); |
| 3302 | | |
| 3303 | | const undefs_off = exports_off + exports_size; |
| 3304 | | const undefs_size = nundefs * @sizeOf(macho.nlist_64); |
| 3305 | | log.debug("writing undefined symbols from 0x{x} to 0x{x}", .{ undefs_off, undefs_size + undefs_off }); |
| 3306 | | try self.base.file.?.pwriteAll(mem.sliceAsBytes(self.undefs.items), undefs_off); |
| 3307 | | |
| 3308 | | symtab.nsyms += @intCast(u32, nlocals + nexports + nundefs); |
| 3309 | | seg.inner.filesize += locals_size + exports_size + undefs_size; |
| 3310 | | |
| 3311 | | // Update dynamic symbol table. |
| 3312 | | const dysymtab = &self.load_commands.items[self.dysymtab_cmd_index.?].Dysymtab; |
| 3313 | | dysymtab.nlocalsym += @intCast(u32, nlocals); |
| 3314 | | dysymtab.iextdefsym = dysymtab.nlocalsym; |
| 3315 | | dysymtab.nextdefsym = @intCast(u32, nexports); |
| 3316 | | dysymtab.iundefsym = dysymtab.nlocalsym + dysymtab.nextdefsym; |
| 3317 | | dysymtab.nundefsym = @intCast(u32, nundefs); |
| 3318 | | |
| 3319 | | const text_segment = &self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 3320 | | const stubs = &text_segment.sections.items[self.stubs_section_index.?]; |
| 3321 | | const data_const_segment = &self.load_commands.items[self.data_const_segment_cmd_index.?].Segment; |
| 3322 | | const got = &data_const_segment.sections.items[self.got_section_index.?]; |
| 3323 | | const data_segment = &self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 3324 | | const la_symbol_ptr = &data_segment.sections.items[self.la_symbol_ptr_section_index.?]; |
| 3325 | | |
| 3326 | | const nstubs = @intCast(u32, self.stubs.items.len); |
| 3327 | | const ngot_entries = @intCast(u32, self.got_entries.items.len); |
| 3328 | | |
| 3329 | | dysymtab.indirectsymoff = @intCast(u32, seg.inner.fileoff + seg.inner.filesize); |
| 3330 | | dysymtab.nindirectsyms = nstubs * 2 + ngot_entries; |
| 3331 | | |
| 3332 | | const needed_size = dysymtab.nindirectsyms * @sizeOf(u32); |
| 3333 | | seg.inner.filesize += needed_size; |
| 3334 | | |
| 3335 | | log.debug("writing indirect symbol table from 0x{x} to 0x{x}", .{ |
| 3336 | | dysymtab.indirectsymoff, |
| 3337 | | dysymtab.indirectsymoff + needed_size, |
| 3338 | | }); |
| 3339 | 3324 | |
| 3340 | | var buf = try self.base.allocator.alloc(u8, needed_size); |
| 3341 | | defer self.base.allocator.free(buf); |
| 3342 | | |
| 3343 | | var stream = std.io.fixedBufferStream(buf); |
| 3344 | | var writer = stream.writer(); |
| 3345 | | |
| 3346 | | stubs.reserved1 = 0; |
| 3347 | | for (self.stubs.items) |id| { |
| 3348 | | try writer.writeIntLittle(u32, dysymtab.iundefsym + id); |
| 3349 | | } |
| 3325 | var n_type: u8 = macho.N_SECT | macho.N_EXT; |
| 3326 | var n_desc: u16 = 0; |
| 3350 | 3327 | |
| 3351 | | got.reserved1 = nstubs; |
| 3352 | | for (self.got_entries.items) |entry| { |
| 3353 | | switch (entry.where) { |
| 3354 | | .undef => { |
| 3355 | | try writer.writeIntLittle(u32, dysymtab.iundefsym + entry.where_index); |
| 3328 | switch (exp.options.linkage) { |
| 3329 | .Internal => { |
| 3330 | // Symbol should be hidden, or in MachO lingo, private extern. |
| 3331 | // We should also mark the symbol as Weak: n_desc == N_WEAK_DEF. |
| 3332 | // TODO work out when to add N_WEAK_REF. |
| 3333 | n_type |= macho.N_PEXT; |
| 3334 | n_desc |= macho.N_WEAK_DEF; |
| 3356 | 3335 | }, |
| 3357 | | .local => { |
| 3358 | | try writer.writeIntLittle(u32, macho.INDIRECT_SYMBOL_LOCAL); |
| 3336 | .Strong => {}, |
| 3337 | .Weak => { |
| 3338 | // Weak linkage is specified as part of n_desc field. |
| 3339 | // Symbol's n_type is like for a symbol with strong linkage. |
| 3340 | n_desc |= macho.N_WEAK_DEF; |
| 3341 | }, |
| 3342 | .LinkOnce => { |
| 3343 | try module.failed_exports.ensureCapacity(module.gpa, module.failed_exports.count() + 1); |
| 3344 | module.failed_exports.putAssumeCapacityNoClobber( |
| 3345 | exp, |
| 3346 | try Module.ErrorMsg.create(self.base.allocator, decl.srcLoc(), "Unimplemented: GlobalLinkage.LinkOnce", .{}), |
| 3347 | ); |
| 3348 | continue; |
| 3359 | 3349 | }, |
| 3360 | 3350 | } |
| 3361 | | } |
| 3362 | 3351 | |
| 3363 | | la_symbol_ptr.reserved1 = got.reserved1 + ngot_entries; |
| 3364 | | for (self.stubs.items) |id| { |
| 3365 | | try writer.writeIntLittle(u32, dysymtab.iundefsym + id); |
| 3366 | | } |
| 3352 | const global_sym_index = if (exp.link.macho.sym_index) |i| i else blk: { |
| 3353 | const i = if (self.globals_free_list.popOrNull()) |i| i else inner: { |
| 3354 | _ = self.globals.addOneAssumeCapacity(); |
| 3355 | break :inner @intCast(u32, self.globals.items.len - 1); |
| 3356 | }; |
| 3357 | break :blk i; |
| 3358 | }; |
| 3367 | 3359 | |
| 3368 | | try self.base.file.?.pwriteAll(buf, dysymtab.indirectsymoff); |
| 3369 | | } |
| 3360 | const n_strx = try self.makeString(exp_name); |
| 3361 | const sym = &self.globals.items[global_sym_index]; |
| 3362 | sym.* = .{ |
| 3363 | .n_strx = try self.makeString(exp_name), |
| 3364 | .n_type = n_type, |
| 3365 | .n_sect = @intCast(u8, self.text_section_index.?) + 1, |
| 3366 | .n_desc = n_desc, |
| 3367 | .n_value = decl_sym.n_value, |
| 3368 | }; |
| 3369 | exp.link.macho.sym_index = global_sym_index; |
| 3370 | 3370 | |
| 3371 | | pub fn deinit(self: *MachO) void { |
| 3372 | | if (build_options.have_llvm) { |
| 3373 | | if (self.llvm_object) |llvm_object| llvm_object.destroy(self.base.allocator); |
| 3371 | const resolv = try self.symbol_resolver.getOrPut(self.base.allocator, n_strx); |
| 3372 | resolv.value_ptr.* = .{ |
| 3373 | .where = .global, |
| 3374 | .where_index = global_sym_index, |
| 3375 | .local_sym_index = decl.link.macho.local_sym_index, |
| 3376 | }; |
| 3374 | 3377 | } |
| 3378 | } |
| 3375 | 3379 | |
| 3376 | | if (self.d_sym) |*ds| { |
| 3377 | | ds.deinit(self.base.allocator); |
| 3378 | | } |
| 3380 | pub fn deleteExport(self: *MachO, exp: Export) void { |
| 3381 | const sym_index = exp.sym_index orelse return; |
| 3382 | self.globals_free_list.append(self.base.allocator, sym_index) catch {}; |
| 3383 | const global = &self.globals.items[sym_index]; |
| 3384 | global.n_type = 0; |
| 3385 | assert(self.symbol_resolver.remove(global.n_strx)); |
| 3386 | } |
| 3379 | 3387 | |
| 3380 | | self.section_ordinals.deinit(self.base.allocator); |
| 3381 | | self.pending_updates.deinit(self.base.allocator); |
| 3382 | | self.got_entries.deinit(self.base.allocator); |
| 3383 | | self.got_entries_map.deinit(self.base.allocator); |
| 3384 | | self.got_entries_free_list.deinit(self.base.allocator); |
| 3385 | | self.stubs.deinit(self.base.allocator); |
| 3386 | | self.stubs_map.deinit(self.base.allocator); |
| 3387 | | self.strtab_dir.deinit(self.base.allocator); |
| 3388 | | self.strtab.deinit(self.base.allocator); |
| 3389 | | self.undefs.deinit(self.base.allocator); |
| 3390 | | self.globals.deinit(self.base.allocator); |
| 3391 | | self.globals_free_list.deinit(self.base.allocator); |
| 3392 | | self.locals.deinit(self.base.allocator); |
| 3393 | | self.locals_free_list.deinit(self.base.allocator); |
| 3394 | | self.symbol_resolver.deinit(self.base.allocator); |
| 3388 | pub fn freeDecl(self: *MachO, decl: *Module.Decl) void { |
| 3389 | log.debug("freeDecl {*}", .{decl}); |
| 3390 | _ = self.decls.swapRemove(decl); |
| 3391 | // Appending to free lists is allowed to fail because the free lists are heuristics based anyway. |
| 3392 | self.freeAtom(&decl.link.macho, .{ |
| 3393 | .seg = self.text_segment_cmd_index.?, |
| 3394 | .sect = self.text_section_index.?, |
| 3395 | }); |
| 3396 | if (decl.link.macho.local_sym_index != 0) { |
| 3397 | self.locals_free_list.append(self.base.allocator, decl.link.macho.local_sym_index) catch {}; |
| 3395 | 3398 | |
| 3396 | | for (self.objects.items) |*object| { |
| 3397 | | object.deinit(self.base.allocator); |
| 3398 | | } |
| 3399 | | self.objects.deinit(self.base.allocator); |
| 3399 | // TODO free GOT atom here. |
| 3400 | 3400 | |
| 3401 | | for (self.archives.items) |*archive| { |
| 3402 | | archive.deinit(self.base.allocator); |
| 3401 | self.locals.items[decl.link.macho.local_sym_index].n_type = 0; |
| 3402 | decl.link.macho.local_sym_index = 0; |
| 3403 | 3403 | } |
| 3404 | | self.archives.deinit(self.base.allocator); |
| 3405 | | |
| 3406 | | for (self.dylibs.items) |*dylib| { |
| 3407 | | dylib.deinit(self.base.allocator); |
| 3404 | if (self.d_sym) |*ds| { |
| 3405 | // TODO make this logic match freeAtom. Maybe abstract the logic |
| 3406 | // out since the same thing is desired for both. |
| 3407 | _ = ds.dbg_line_fn_free_list.remove(&decl.fn_link.macho); |
| 3408 | if (decl.fn_link.macho.prev) |prev| { |
| 3409 | ds.dbg_line_fn_free_list.put(self.base.allocator, prev, {}) catch {}; |
| 3410 | prev.next = decl.fn_link.macho.next; |
| 3411 | if (decl.fn_link.macho.next) |next| { |
| 3412 | next.prev = prev; |
| 3413 | } else { |
| 3414 | ds.dbg_line_fn_last = prev; |
| 3415 | } |
| 3416 | } else if (decl.fn_link.macho.next) |next| { |
| 3417 | ds.dbg_line_fn_first = next; |
| 3418 | next.prev = null; |
| 3419 | } |
| 3420 | if (ds.dbg_line_fn_first == &decl.fn_link.macho) { |
| 3421 | ds.dbg_line_fn_first = decl.fn_link.macho.next; |
| 3422 | } |
| 3423 | if (ds.dbg_line_fn_last == &decl.fn_link.macho) { |
| 3424 | ds.dbg_line_fn_last = decl.fn_link.macho.prev; |
| 3425 | } |
| 3408 | 3426 | } |
| 3409 | | self.dylibs.deinit(self.base.allocator); |
| 3410 | | self.dylibs_map.deinit(self.base.allocator); |
| 3411 | | self.referenced_dylibs.deinit(self.base.allocator); |
| 3427 | } |
| 3412 | 3428 | |
| 3413 | | for (self.load_commands.items) |*lc| { |
| 3414 | | lc.deinit(self.base.allocator); |
| 3415 | | } |
| 3416 | | self.load_commands.deinit(self.base.allocator); |
| 3429 | pub fn getDeclVAddr(self: *MachO, decl: *const Module.Decl) u64 { |
| 3430 | assert(decl.link.macho.local_sym_index != 0); |
| 3431 | return self.locals.items[decl.link.macho.local_sym_index].n_value; |
| 3432 | } |
| 3417 | 3433 | |
| 3418 | | for (self.managed_blocks.items) |block| { |
| 3419 | | block.deinit(self.base.allocator); |
| 3420 | | self.base.allocator.destroy(block); |
| 3434 | pub fn populateMissingMetadata(self: *MachO) !void { |
| 3435 | if (self.pagezero_segment_cmd_index == null) { |
| 3436 | self.pagezero_segment_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 3437 | try self.load_commands.append(self.base.allocator, .{ |
| 3438 | .Segment = .{ |
| 3439 | .inner = .{ |
| 3440 | .segname = makeStaticString("__PAGEZERO"), |
| 3441 | .vmsize = pagezero_vmsize, |
| 3442 | }, |
| 3443 | }, |
| 3444 | }); |
| 3445 | self.load_commands_dirty = true; |
| 3421 | 3446 | } |
| 3422 | | self.managed_blocks.deinit(self.base.allocator); |
| 3423 | | self.blocks.deinit(self.base.allocator); |
| 3424 | | self.text_block_free_list.deinit(self.base.allocator); |
| 3425 | 3447 | |
| 3426 | | for (self.decls.keys()) |decl| { |
| 3427 | | decl.link.macho.deinit(self.base.allocator); |
| 3448 | if (self.text_segment_cmd_index == null) { |
| 3449 | self.text_segment_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 3450 | const program_code_size_hint = self.base.options.program_code_size_hint; |
| 3451 | const got_size_hint = @sizeOf(u64) * self.base.options.symbol_count_hint; |
| 3452 | const ideal_size = self.header_pad + program_code_size_hint + got_size_hint; |
| 3453 | const needed_size = mem.alignForwardGeneric(u64, padToIdeal(ideal_size), self.page_size); |
| 3454 | |
| 3455 | log.debug("found __TEXT segment free space 0x{x} to 0x{x}", .{ 0, needed_size }); |
| 3456 | |
| 3457 | try self.load_commands.append(self.base.allocator, .{ |
| 3458 | .Segment = .{ |
| 3459 | .inner = .{ |
| 3460 | .segname = makeStaticString("__TEXT"), |
| 3461 | .vmaddr = pagezero_vmsize, |
| 3462 | .vmsize = needed_size, |
| 3463 | .filesize = needed_size, |
| 3464 | .maxprot = macho.VM_PROT_READ | macho.VM_PROT_EXECUTE, |
| 3465 | .initprot = macho.VM_PROT_READ | macho.VM_PROT_EXECUTE, |
| 3466 | }, |
| 3467 | }, |
| 3468 | }); |
| 3469 | self.load_commands_dirty = true; |
| 3428 | 3470 | } |
| 3429 | | self.decls.deinit(self.base.allocator); |
| 3430 | | } |
| 3431 | 3471 | |
| 3432 | | pub fn closeFiles(self: MachO) void { |
| 3433 | | for (self.objects.items) |object| { |
| 3434 | | object.file.close(); |
| 3472 | if (self.text_section_index == null) { |
| 3473 | const alignment: u2 = switch (self.base.options.target.cpu.arch) { |
| 3474 | .x86_64 => 0, |
| 3475 | .aarch64 => 2, |
| 3476 | else => unreachable, // unhandled architecture type |
| 3477 | }; |
| 3478 | const needed_size = self.base.options.program_code_size_hint; |
| 3479 | self.text_section_index = try self.allocateSection( |
| 3480 | self.text_segment_cmd_index.?, |
| 3481 | "__text", |
| 3482 | needed_size, |
| 3483 | alignment, |
| 3484 | .{ |
| 3485 | .flags = macho.S_REGULAR | macho.S_ATTR_PURE_INSTRUCTIONS | macho.S_ATTR_SOME_INSTRUCTIONS, |
| 3486 | }, |
| 3487 | ); |
| 3435 | 3488 | } |
| 3436 | | for (self.archives.items) |archive| { |
| 3437 | | archive.file.close(); |
| 3489 | |
| 3490 | if (self.stubs_section_index == null) { |
| 3491 | const alignment: u2 = switch (self.base.options.target.cpu.arch) { |
| 3492 | .x86_64 => 0, |
| 3493 | .aarch64 => 2, |
| 3494 | else => unreachable, // unhandled architecture type |
| 3495 | }; |
| 3496 | const stub_size: u4 = switch (self.base.options.target.cpu.arch) { |
| 3497 | .x86_64 => 6, |
| 3498 | .aarch64 => 3 * @sizeOf(u32), |
| 3499 | else => unreachable, // unhandled architecture type |
| 3500 | }; |
| 3501 | const needed_size = stub_size * self.base.options.symbol_count_hint; |
| 3502 | self.stubs_section_index = try self.allocateSection( |
| 3503 | self.text_segment_cmd_index.?, |
| 3504 | "__stubs", |
| 3505 | needed_size, |
| 3506 | alignment, |
| 3507 | .{ |
| 3508 | .flags = macho.S_SYMBOL_STUBS | macho.S_ATTR_PURE_INSTRUCTIONS | macho.S_ATTR_SOME_INSTRUCTIONS, |
| 3509 | .reserved2 = stub_size, |
| 3510 | }, |
| 3511 | ); |
| 3438 | 3512 | } |
| 3439 | | for (self.dylibs.items) |dylib| { |
| 3440 | | dylib.file.close(); |
| 3513 | |
| 3514 | if (self.stub_helper_section_index == null) { |
| 3515 | const alignment: u2 = switch (self.base.options.target.cpu.arch) { |
| 3516 | .x86_64 => 0, |
| 3517 | .aarch64 => 2, |
| 3518 | else => unreachable, // unhandled architecture type |
| 3519 | }; |
| 3520 | const preamble_size: u6 = switch (self.base.options.target.cpu.arch) { |
| 3521 | .x86_64 => 15, |
| 3522 | .aarch64 => 6 * @sizeOf(u32), |
| 3523 | else => unreachable, |
| 3524 | }; |
| 3525 | const stub_size: u4 = switch (self.base.options.target.cpu.arch) { |
| 3526 | .x86_64 => 10, |
| 3527 | .aarch64 => 3 * @sizeOf(u32), |
| 3528 | else => unreachable, |
| 3529 | }; |
| 3530 | const needed_size = stub_size * self.base.options.symbol_count_hint + preamble_size; |
| 3531 | self.stub_helper_section_index = try self.allocateSection( |
| 3532 | self.text_segment_cmd_index.?, |
| 3533 | "__stub_helper", |
| 3534 | needed_size, |
| 3535 | alignment, |
| 3536 | .{ |
| 3537 | .flags = macho.S_REGULAR | macho.S_ATTR_PURE_INSTRUCTIONS | macho.S_ATTR_SOME_INSTRUCTIONS, |
| 3538 | }, |
| 3539 | ); |
| 3441 | 3540 | } |
| 3442 | | } |
| 3443 | 3541 | |
| 3444 | | fn freeTextBlock(self: *MachO, text_block: *TextBlock) void { |
| 3445 | | log.debug("freeTextBlock {*}", .{text_block}); |
| 3446 | | text_block.deinit(self.base.allocator); |
| 3542 | if (self.data_const_segment_cmd_index == null) { |
| 3543 | self.data_const_segment_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 3544 | const address_and_offset = self.nextSegmentAddressAndOffset(); |
| 3545 | const ideal_size = @sizeOf(u64) * self.base.options.symbol_count_hint; |
| 3546 | const needed_size = mem.alignForwardGeneric(u64, padToIdeal(ideal_size), self.page_size); |
| 3447 | 3547 | |
| 3448 | | var already_have_free_list_node = false; |
| 3449 | | { |
| 3450 | | var i: usize = 0; |
| 3451 | | // TODO turn text_block_free_list into a hash map |
| 3452 | | while (i < self.text_block_free_list.items.len) { |
| 3453 | | if (self.text_block_free_list.items[i] == text_block) { |
| 3454 | | _ = self.text_block_free_list.swapRemove(i); |
| 3455 | | continue; |
| 3456 | | } |
| 3457 | | if (self.text_block_free_list.items[i] == text_block.prev) { |
| 3458 | | already_have_free_list_node = true; |
| 3459 | | } |
| 3460 | | i += 1; |
| 3461 | | } |
| 3462 | | } |
| 3463 | | // TODO process free list for dbg info just like we do above for vaddrs |
| 3548 | log.debug("found __DATA_CONST segment free space 0x{x} to 0x{x}", .{ |
| 3549 | address_and_offset.offset, |
| 3550 | address_and_offset.offset + needed_size, |
| 3551 | }); |
| 3464 | 3552 | |
| 3465 | | if (self.last_text_block == text_block) { |
| 3466 | | // TODO shrink the __text section size here |
| 3467 | | self.last_text_block = text_block.prev; |
| 3553 | try self.load_commands.append(self.base.allocator, .{ |
| 3554 | .Segment = .{ |
| 3555 | .inner = .{ |
| 3556 | .segname = makeStaticString("__DATA_CONST"), |
| 3557 | .vmaddr = address_and_offset.address, |
| 3558 | .vmsize = needed_size, |
| 3559 | .fileoff = address_and_offset.offset, |
| 3560 | .filesize = needed_size, |
| 3561 | .maxprot = macho.VM_PROT_READ | macho.VM_PROT_WRITE, |
| 3562 | .initprot = macho.VM_PROT_READ | macho.VM_PROT_WRITE, |
| 3563 | }, |
| 3564 | }, |
| 3565 | }); |
| 3566 | self.load_commands_dirty = true; |
| 3468 | 3567 | } |
| 3469 | | if (self.d_sym) |*ds| { |
| 3470 | | if (ds.dbg_info_decl_first == text_block) { |
| 3471 | | ds.dbg_info_decl_first = text_block.dbg_info_next; |
| 3472 | | } |
| 3473 | | if (ds.dbg_info_decl_last == text_block) { |
| 3474 | | // TODO shrink the .debug_info section size here |
| 3475 | | ds.dbg_info_decl_last = text_block.dbg_info_prev; |
| 3476 | | } |
| 3568 | |
| 3569 | if (self.got_section_index == null) { |
| 3570 | const needed_size = @sizeOf(u64) * self.base.options.symbol_count_hint; |
| 3571 | const alignment: u16 = 3; // 2^3 = @sizeOf(u64) |
| 3572 | self.got_section_index = try self.allocateSection( |
| 3573 | self.data_const_segment_cmd_index.?, |
| 3574 | "__got", |
| 3575 | needed_size, |
| 3576 | alignment, |
| 3577 | .{ |
| 3578 | .flags = macho.S_NON_LAZY_SYMBOL_POINTERS, |
| 3579 | }, |
| 3580 | ); |
| 3477 | 3581 | } |
| 3478 | 3582 | |
| 3479 | | if (text_block.prev) |prev| { |
| 3480 | | prev.next = text_block.next; |
| 3583 | if (self.data_segment_cmd_index == null) { |
| 3584 | self.data_segment_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 3585 | const address_and_offset = self.nextSegmentAddressAndOffset(); |
| 3586 | const ideal_size = 2 * @sizeOf(u64) * self.base.options.symbol_count_hint; |
| 3587 | const needed_size = mem.alignForwardGeneric(u64, padToIdeal(ideal_size), self.page_size); |
| 3481 | 3588 | |
| 3482 | | if (!already_have_free_list_node and prev.freeListEligible(self.*)) { |
| 3483 | | // The free list is heuristics, it doesn't have to be perfect, so we can ignore |
| 3484 | | // the OOM here. |
| 3485 | | self.text_block_free_list.append(self.base.allocator, prev) catch {}; |
| 3486 | | } |
| 3487 | | } else { |
| 3488 | | text_block.prev = null; |
| 3589 | log.debug("found __DATA segment free space 0x{x} to 0x{x}", .{ address_and_offset.offset, address_and_offset.offset + needed_size }); |
| 3590 | |
| 3591 | try self.load_commands.append(self.base.allocator, .{ |
| 3592 | .Segment = .{ |
| 3593 | .inner = .{ |
| 3594 | .segname = makeStaticString("__DATA"), |
| 3595 | .vmaddr = address_and_offset.address, |
| 3596 | .vmsize = needed_size, |
| 3597 | .fileoff = address_and_offset.offset, |
| 3598 | .filesize = needed_size, |
| 3599 | .maxprot = macho.VM_PROT_READ | macho.VM_PROT_WRITE, |
| 3600 | .initprot = macho.VM_PROT_READ | macho.VM_PROT_WRITE, |
| 3601 | }, |
| 3602 | }, |
| 3603 | }); |
| 3604 | self.load_commands_dirty = true; |
| 3489 | 3605 | } |
| 3490 | 3606 | |
| 3491 | | if (text_block.next) |next| { |
| 3492 | | next.prev = text_block.prev; |
| 3493 | | } else { |
| 3494 | | text_block.next = null; |
| 3607 | if (self.la_symbol_ptr_section_index == null) { |
| 3608 | const needed_size = @sizeOf(u64) * self.base.options.symbol_count_hint; |
| 3609 | const alignment: u16 = 3; // 2^3 = @sizeOf(u64) |
| 3610 | self.la_symbol_ptr_section_index = try self.allocateSection( |
| 3611 | self.data_segment_cmd_index.?, |
| 3612 | "__la_symbol_ptr", |
| 3613 | needed_size, |
| 3614 | alignment, |
| 3615 | .{ |
| 3616 | .flags = macho.S_LAZY_SYMBOL_POINTERS, |
| 3617 | }, |
| 3618 | ); |
| 3495 | 3619 | } |
| 3496 | 3620 | |
| 3497 | | if (text_block.dbg_info_prev) |prev| { |
| 3498 | | prev.dbg_info_next = text_block.dbg_info_next; |
| 3621 | if (self.data_section_index == null) { |
| 3622 | const needed_size = @sizeOf(u64) * self.base.options.symbol_count_hint; |
| 3623 | const alignment: u16 = 3; // 2^3 = @sizeOf(u64) |
| 3624 | self.data_section_index = try self.allocateSection( |
| 3625 | self.data_segment_cmd_index.?, |
| 3626 | "__data", |
| 3627 | needed_size, |
| 3628 | alignment, |
| 3629 | .{}, |
| 3630 | ); |
| 3631 | } |
| 3499 | 3632 | |
| 3500 | | // TODO the free list logic like we do for text blocks above |
| 3501 | | } else { |
| 3502 | | text_block.dbg_info_prev = null; |
| 3633 | if (self.tlv_section_index == null) { |
| 3634 | const needed_size = @sizeOf(u64) * self.base.options.symbol_count_hint; |
| 3635 | const alignment: u16 = 3; // 2^3 = @sizeOf(u64) |
| 3636 | self.tlv_section_index = try self.allocateSection( |
| 3637 | self.data_segment_cmd_index.?, |
| 3638 | "__thread_vars", |
| 3639 | needed_size, |
| 3640 | alignment, |
| 3641 | .{ |
| 3642 | .flags = macho.S_THREAD_LOCAL_VARIABLES, |
| 3643 | }, |
| 3644 | ); |
| 3503 | 3645 | } |
| 3504 | 3646 | |
| 3505 | | if (text_block.dbg_info_next) |next| { |
| 3506 | | next.dbg_info_prev = text_block.dbg_info_prev; |
| 3507 | | } else { |
| 3508 | | text_block.dbg_info_next = null; |
| 3647 | if (self.tlv_data_section_index == null) { |
| 3648 | const needed_size = @sizeOf(u64) * self.base.options.symbol_count_hint; |
| 3649 | const alignment: u16 = 3; // 2^3 = @sizeOf(u64) |
| 3650 | self.tlv_data_section_index = try self.allocateSection( |
| 3651 | self.data_segment_cmd_index.?, |
| 3652 | "__thread_data", |
| 3653 | needed_size, |
| 3654 | alignment, |
| 3655 | .{ |
| 3656 | .flags = macho.S_THREAD_LOCAL_REGULAR, |
| 3657 | }, |
| 3658 | ); |
| 3509 | 3659 | } |
| 3510 | | } |
| 3511 | 3660 | |
| 3512 | | fn shrinkTextBlock(self: *MachO, text_block: *TextBlock, new_block_size: u64) void { |
| 3513 | | _ = self; |
| 3514 | | _ = text_block; |
| 3515 | | _ = new_block_size; |
| 3516 | | // TODO check the new capacity, and if it crosses the size threshold into a big enough |
| 3517 | | // capacity, insert a free list node for it. |
| 3518 | | } |
| 3661 | if (self.tlv_bss_section_index == null) { |
| 3662 | const needed_size = @sizeOf(u64) * self.base.options.symbol_count_hint; |
| 3663 | const alignment: u16 = 3; // 2^3 = @sizeOf(u64) |
| 3664 | self.tlv_bss_section_index = try self.allocateSection( |
| 3665 | self.data_segment_cmd_index.?, |
| 3666 | "__thread_bss", |
| 3667 | needed_size, |
| 3668 | alignment, |
| 3669 | .{ |
| 3670 | .flags = macho.S_THREAD_LOCAL_ZEROFILL, |
| 3671 | }, |
| 3672 | ); |
| 3673 | const seg = self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 3674 | const sect = seg.sections.items[self.tlv_bss_section_index.?]; |
| 3675 | self.tlv_bss_file_offset = sect.offset; |
| 3676 | } |
| 3519 | 3677 | |
| 3520 | | fn growTextBlock(self: *MachO, text_block: *TextBlock, new_block_size: u64, alignment: u64) !u64 { |
| 3521 | | const sym = self.locals.items[text_block.local_sym_index]; |
| 3522 | | const align_ok = mem.alignBackwardGeneric(u64, sym.n_value, alignment) == sym.n_value; |
| 3523 | | const need_realloc = !align_ok or new_block_size > text_block.capacity(self.*); |
| 3524 | | if (!need_realloc) return sym.n_value; |
| 3525 | | return self.allocateTextBlock(text_block, new_block_size, alignment); |
| 3526 | | } |
| 3678 | if (self.bss_section_index == null) { |
| 3679 | const needed_size = @sizeOf(u64) * self.base.options.symbol_count_hint; |
| 3680 | const alignment: u16 = 3; // 2^3 = @sizeOf(u64) |
| 3681 | self.bss_section_index = try self.allocateSection( |
| 3682 | self.data_segment_cmd_index.?, |
| 3683 | "__bss", |
| 3684 | needed_size, |
| 3685 | alignment, |
| 3686 | .{ |
| 3687 | .flags = macho.S_ZEROFILL, |
| 3688 | }, |
| 3689 | ); |
| 3690 | const seg = self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 3691 | const sect = seg.sections.items[self.bss_section_index.?]; |
| 3692 | self.bss_file_offset = sect.offset; |
| 3693 | } |
| 3527 | 3694 | |
| 3528 | | pub fn allocateDeclIndexes(self: *MachO, decl: *Module.Decl) !void { |
| 3529 | | if (decl.link.macho.local_sym_index != 0) return; |
| 3695 | if (self.linkedit_segment_cmd_index == null) { |
| 3696 | self.linkedit_segment_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 3697 | const address_and_offset = self.nextSegmentAddressAndOffset(); |
| 3530 | 3698 | |
| 3531 | | try self.locals.ensureUnusedCapacity(self.base.allocator, 1); |
| 3532 | | try self.got_entries.ensureUnusedCapacity(self.base.allocator, 1); |
| 3699 | log.debug("found __LINKEDIT segment free space at 0x{x}", .{address_and_offset.offset}); |
| 3533 | 3700 | |
| 3534 | | try self.decls.putNoClobber(self.base.allocator, decl, {}); |
| 3701 | try self.load_commands.append(self.base.allocator, .{ |
| 3702 | .Segment = .{ |
| 3703 | .inner = .{ |
| 3704 | .segname = makeStaticString("__LINKEDIT"), |
| 3705 | .vmaddr = address_and_offset.address, |
| 3706 | .fileoff = address_and_offset.offset, |
| 3707 | .maxprot = macho.VM_PROT_READ, |
| 3708 | .initprot = macho.VM_PROT_READ, |
| 3709 | }, |
| 3710 | }, |
| 3711 | }); |
| 3712 | self.load_commands_dirty = true; |
| 3713 | } |
| 3535 | 3714 | |
| 3536 | | if (self.locals_free_list.popOrNull()) |i| { |
| 3537 | | log.debug("reusing symbol index {d} for {s}", .{ i, decl.name }); |
| 3538 | | decl.link.macho.local_sym_index = i; |
| 3539 | | } else { |
| 3540 | | log.debug("allocating symbol index {d} for {s}", .{ self.locals.items.len, decl.name }); |
| 3541 | | decl.link.macho.local_sym_index = @intCast(u32, self.locals.items.len); |
| 3542 | | _ = self.locals.addOneAssumeCapacity(); |
| 3715 | if (self.dyld_info_cmd_index == null) { |
| 3716 | self.dyld_info_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 3717 | try self.load_commands.append(self.base.allocator, .{ |
| 3718 | .DyldInfoOnly = .{ |
| 3719 | .cmd = macho.LC_DYLD_INFO_ONLY, |
| 3720 | .cmdsize = @sizeOf(macho.dyld_info_command), |
| 3721 | .rebase_off = 0, |
| 3722 | .rebase_size = 0, |
| 3723 | .bind_off = 0, |
| 3724 | .bind_size = 0, |
| 3725 | .weak_bind_off = 0, |
| 3726 | .weak_bind_size = 0, |
| 3727 | .lazy_bind_off = 0, |
| 3728 | .lazy_bind_size = 0, |
| 3729 | .export_off = 0, |
| 3730 | .export_size = 0, |
| 3731 | }, |
| 3732 | }); |
| 3733 | self.load_commands_dirty = true; |
| 3543 | 3734 | } |
| 3544 | 3735 | |
| 3545 | | const got_index: u32 = blk: { |
| 3546 | | if (self.got_entries_free_list.popOrNull()) |i| { |
| 3547 | | log.debug("reusing GOT entry index {d} for {s}", .{ i, decl.name }); |
| 3548 | | break :blk i; |
| 3549 | | } else { |
| 3550 | | const got_index = @intCast(u32, self.got_entries.items.len); |
| 3551 | | log.debug("allocating GOT entry index {d} for {s}", .{ got_index, decl.name }); |
| 3552 | | _ = self.got_entries.addOneAssumeCapacity(); |
| 3553 | | self.got_entries_count_dirty = true; |
| 3554 | | self.rebase_info_dirty = true; |
| 3555 | | break :blk got_index; |
| 3556 | | } |
| 3557 | | }; |
| 3558 | | |
| 3559 | | self.locals.items[decl.link.macho.local_sym_index] = .{ |
| 3560 | | .n_strx = 0, |
| 3561 | | .n_type = 0, |
| 3562 | | .n_sect = 0, |
| 3563 | | .n_desc = 0, |
| 3564 | | .n_value = 0, |
| 3565 | | }; |
| 3566 | | const got_entry = GotIndirectionKey{ |
| 3567 | | .where = .local, |
| 3568 | | .where_index = decl.link.macho.local_sym_index, |
| 3569 | | }; |
| 3570 | | self.got_entries.items[got_index] = got_entry; |
| 3571 | | try self.got_entries_map.putNoClobber(self.base.allocator, got_entry, got_index); |
| 3572 | | } |
| 3573 | | |
| 3574 | | pub fn updateFunc(self: *MachO, module: *Module, func: *Module.Fn, air: Air, liveness: Liveness) !void { |
| 3575 | | if (build_options.skip_non_native and builtin.object_format != .macho) { |
| 3576 | | @panic("Attempted to compile for object format that was disabled by build configuration"); |
| 3577 | | } |
| 3578 | | if (build_options.have_llvm) { |
| 3579 | | if (self.llvm_object) |llvm_object| return llvm_object.updateFunc(module, func, air, liveness); |
| 3580 | | } |
| 3581 | | const tracy = trace(@src()); |
| 3582 | | defer tracy.end(); |
| 3583 | | |
| 3584 | | const decl = func.owner_decl; |
| 3585 | | |
| 3586 | | var code_buffer = std.ArrayList(u8).init(self.base.allocator); |
| 3587 | | defer code_buffer.deinit(); |
| 3588 | | |
| 3589 | | var debug_buffers_buf: DebugSymbols.DeclDebugBuffers = undefined; |
| 3590 | | const debug_buffers = if (self.d_sym) |*ds| blk: { |
| 3591 | | debug_buffers_buf = try ds.initDeclDebugBuffers(self.base.allocator, module, decl); |
| 3592 | | break :blk &debug_buffers_buf; |
| 3593 | | } else null; |
| 3594 | | defer { |
| 3595 | | if (debug_buffers) |dbg| { |
| 3596 | | dbg.dbg_line_buffer.deinit(); |
| 3597 | | dbg.dbg_info_buffer.deinit(); |
| 3598 | | var it = dbg.dbg_info_type_relocs.valueIterator(); |
| 3599 | | while (it.next()) |value| { |
| 3600 | | value.relocs.deinit(self.base.allocator); |
| 3601 | | } |
| 3602 | | dbg.dbg_info_type_relocs.deinit(self.base.allocator); |
| 3603 | | } |
| 3604 | | } |
| 3605 | | |
| 3606 | | self.active_decl = decl; |
| 3607 | | |
| 3608 | | const res = if (debug_buffers) |dbg| |
| 3609 | | try codegen.generateFunction(&self.base, decl.srcLoc(), func, air, liveness, &code_buffer, .{ |
| 3610 | | .dwarf = .{ |
| 3611 | | .dbg_line = &dbg.dbg_line_buffer, |
| 3612 | | .dbg_info = &dbg.dbg_info_buffer, |
| 3613 | | .dbg_info_type_relocs = &dbg.dbg_info_type_relocs, |
| 3614 | | }, |
| 3615 | | }) |
| 3616 | | else |
| 3617 | | try codegen.generateFunction(&self.base, decl.srcLoc(), func, air, liveness, &code_buffer, .none); |
| 3618 | | switch (res) { |
| 3619 | | .appended => { |
| 3620 | | // TODO clearing the code and relocs buffer should probably be orchestrated |
| 3621 | | // in a different, smarter, more automatic way somewhere else, in a more centralised |
| 3622 | | // way than this. |
| 3623 | | // If we don't clear the buffers here, we are up for some nasty surprises when |
| 3624 | | // this TextBlock is reused later on and was not freed by freeTextBlock(). |
| 3625 | | decl.link.macho.code.clearAndFree(self.base.allocator); |
| 3626 | | try decl.link.macho.code.appendSlice(self.base.allocator, code_buffer.items); |
| 3627 | | }, |
| 3628 | | .fail => |em| { |
| 3629 | | decl.analysis = .codegen_failure; |
| 3630 | | try module.failed_decls.put(module.gpa, decl, em); |
| 3631 | | return; |
| 3632 | | }, |
| 3633 | | } |
| 3634 | | |
| 3635 | | const symbol = try self.placeDecl(decl, decl.link.macho.code.items.len); |
| 3636 | | |
| 3637 | | try self.writeCode(symbol, decl.link.macho.code.items); |
| 3638 | | |
| 3639 | | if (debug_buffers) |db| { |
| 3640 | | try self.d_sym.?.commitDeclDebugInfo( |
| 3641 | | self.base.allocator, |
| 3642 | | module, |
| 3643 | | decl, |
| 3644 | | db, |
| 3645 | | self.base.options.target, |
| 3646 | | ); |
| 3647 | | } |
| 3648 | | |
| 3649 | | // Since we updated the vaddr and the size, each corresponding export symbol also |
| 3650 | | // needs to be updated. |
| 3651 | | const decl_exports = module.decl_exports.get(decl) orelse &[0]*Module.Export{}; |
| 3652 | | try self.updateDeclExports(module, decl, decl_exports); |
| 3653 | | } |
| 3654 | | |
| 3655 | | pub fn updateDecl(self: *MachO, module: *Module, decl: *Module.Decl) !void { |
| 3656 | | if (build_options.skip_non_native and builtin.object_format != .macho) { |
| 3657 | | @panic("Attempted to compile for object format that was disabled by build configuration"); |
| 3658 | | } |
| 3659 | | if (build_options.have_llvm) { |
| 3660 | | if (self.llvm_object) |llvm_object| return llvm_object.updateDecl(module, decl); |
| 3661 | | } |
| 3662 | | const tracy = trace(@src()); |
| 3663 | | defer tracy.end(); |
| 3664 | | |
| 3665 | | if (decl.val.tag() == .extern_fn) { |
| 3666 | | return; // TODO Should we do more when front-end analyzed extern decl? |
| 3667 | | } |
| 3668 | | |
| 3669 | | var code_buffer = std.ArrayList(u8).init(self.base.allocator); |
| 3670 | | defer code_buffer.deinit(); |
| 3671 | | |
| 3672 | | var debug_buffers_buf: DebugSymbols.DeclDebugBuffers = undefined; |
| 3673 | | const debug_buffers = if (self.d_sym) |*ds| blk: { |
| 3674 | | debug_buffers_buf = try ds.initDeclDebugBuffers(self.base.allocator, module, decl); |
| 3675 | | break :blk &debug_buffers_buf; |
| 3676 | | } else null; |
| 3677 | | defer { |
| 3678 | | if (debug_buffers) |dbg| { |
| 3679 | | dbg.dbg_line_buffer.deinit(); |
| 3680 | | dbg.dbg_info_buffer.deinit(); |
| 3681 | | var it = dbg.dbg_info_type_relocs.valueIterator(); |
| 3682 | | while (it.next()) |value| { |
| 3683 | | value.relocs.deinit(self.base.allocator); |
| 3684 | | } |
| 3685 | | dbg.dbg_info_type_relocs.deinit(self.base.allocator); |
| 3686 | | } |
| 3687 | | } |
| 3688 | | |
| 3689 | | self.active_decl = decl; |
| 3690 | | |
| 3691 | | const res = if (debug_buffers) |dbg| |
| 3692 | | try codegen.generateSymbol(&self.base, decl.srcLoc(), .{ |
| 3693 | | .ty = decl.ty, |
| 3694 | | .val = decl.val, |
| 3695 | | }, &code_buffer, .{ |
| 3696 | | .dwarf = .{ |
| 3697 | | .dbg_line = &dbg.dbg_line_buffer, |
| 3698 | | .dbg_info = &dbg.dbg_info_buffer, |
| 3699 | | .dbg_info_type_relocs = &dbg.dbg_info_type_relocs, |
| 3700 | | }, |
| 3701 | | }) |
| 3702 | | else |
| 3703 | | try codegen.generateSymbol(&self.base, decl.srcLoc(), .{ |
| 3704 | | .ty = decl.ty, |
| 3705 | | .val = decl.val, |
| 3706 | | }, &code_buffer, .none); |
| 3707 | | |
| 3708 | | const code = blk: { |
| 3709 | | switch (res) { |
| 3710 | | .externally_managed => |x| break :blk x, |
| 3711 | | .appended => { |
| 3712 | | // TODO clearing the code and relocs buffer should probably be orchestrated |
| 3713 | | // in a different, smarter, more automatic way somewhere else, in a more centralised |
| 3714 | | // way than this. |
| 3715 | | // If we don't clear the buffers here, we are up for some nasty surprises when |
| 3716 | | // this TextBlock is reused later on and was not freed by freeTextBlock(). |
| 3717 | | decl.link.macho.code.clearAndFree(self.base.allocator); |
| 3718 | | try decl.link.macho.code.appendSlice(self.base.allocator, code_buffer.items); |
| 3719 | | break :blk decl.link.macho.code.items; |
| 3720 | | }, |
| 3721 | | .fail => |em| { |
| 3722 | | decl.analysis = .codegen_failure; |
| 3723 | | try module.failed_decls.put(module.gpa, decl, em); |
| 3724 | | return; |
| 3725 | | }, |
| 3726 | | } |
| 3727 | | }; |
| 3728 | | const symbol = try self.placeDecl(decl, code.len); |
| 3729 | | |
| 3730 | | try self.writeCode(symbol, code); |
| 3731 | | |
| 3732 | | // Since we updated the vaddr and the size, each corresponding export symbol also |
| 3733 | | // needs to be updated. |
| 3734 | | const decl_exports = module.decl_exports.get(decl) orelse &[0]*Module.Export{}; |
| 3735 | | try self.updateDeclExports(module, decl, decl_exports); |
| 3736 | | } |
| 3737 | | |
| 3738 | | fn placeDecl(self: *MachO, decl: *Module.Decl, code_len: usize) !*macho.nlist_64 { |
| 3739 | | const required_alignment = decl.ty.abiAlignment(self.base.options.target); |
| 3740 | | assert(decl.link.macho.local_sym_index != 0); // Caller forgot to call allocateDeclIndexes() |
| 3741 | | const symbol = &self.locals.items[decl.link.macho.local_sym_index]; |
| 3742 | | |
| 3743 | | if (decl.link.macho.size != 0) { |
| 3744 | | const capacity = decl.link.macho.capacity(self.*); |
| 3745 | | const need_realloc = code_len > capacity or !mem.isAlignedGeneric(u64, symbol.n_value, required_alignment); |
| 3746 | | if (need_realloc) { |
| 3747 | | const vaddr = try self.growTextBlock(&decl.link.macho, code_len, required_alignment); |
| 3748 | | |
| 3749 | | log.debug("growing {s} and moving from 0x{x} to 0x{x}", .{ decl.name, symbol.n_value, vaddr }); |
| 3750 | | |
| 3751 | | if (vaddr != symbol.n_value) { |
| 3752 | | log.debug(" (writing new GOT entry)", .{}); |
| 3753 | | const got_index = self.got_entries_map.get(.{ |
| 3754 | | .where = .local, |
| 3755 | | .where_index = decl.link.macho.local_sym_index, |
| 3756 | | }) orelse unreachable; |
| 3757 | | try self.writeGotEntry(got_index); |
| 3758 | | } |
| 3759 | | |
| 3760 | | symbol.n_value = vaddr; |
| 3761 | | } else if (code_len < decl.link.macho.size) { |
| 3762 | | self.shrinkTextBlock(&decl.link.macho, code_len); |
| 3763 | | } |
| 3764 | | decl.link.macho.size = code_len; |
| 3765 | | |
| 3766 | | const new_name = try std.fmt.allocPrint(self.base.allocator, "_{s}", .{mem.spanZ(decl.name)}); |
| 3767 | | defer self.base.allocator.free(new_name); |
| 3768 | | |
| 3769 | | symbol.n_strx = try self.makeString(new_name); |
| 3770 | | symbol.n_type = macho.N_SECT; |
| 3771 | | symbol.n_sect = @intCast(u8, self.text_section_index.?) + 1; |
| 3772 | | symbol.n_desc = 0; |
| 3773 | | |
| 3774 | | try self.writeLocalSymbol(decl.link.macho.local_sym_index); |
| 3775 | | if (self.d_sym) |*ds| |
| 3776 | | try ds.writeLocalSymbol(decl.link.macho.local_sym_index); |
| 3777 | | } else { |
| 3778 | | const decl_name = try std.fmt.allocPrint(self.base.allocator, "_{s}", .{mem.spanZ(decl.name)}); |
| 3779 | | defer self.base.allocator.free(decl_name); |
| 3780 | | |
| 3781 | | const name_str_index = try self.makeString(decl_name); |
| 3782 | | const addr = try self.allocateTextBlock(&decl.link.macho, code_len, required_alignment); |
| 3783 | | |
| 3784 | | log.debug("allocated text block for {s} at 0x{x}", .{ decl_name, addr }); |
| 3785 | | |
| 3786 | | errdefer self.freeTextBlock(&decl.link.macho); |
| 3787 | | |
| 3788 | | symbol.* = .{ |
| 3789 | | .n_strx = name_str_index, |
| 3790 | | .n_type = macho.N_SECT, |
| 3791 | | .n_sect = @intCast(u8, self.text_section_index.?) + 1, |
| 3792 | | .n_desc = 0, |
| 3793 | | .n_value = addr, |
| 3794 | | }; |
| 3795 | | const got_index = self.got_entries_map.get(.{ |
| 3796 | | .where = .local, |
| 3797 | | .where_index = decl.link.macho.local_sym_index, |
| 3798 | | }) orelse unreachable; |
| 3799 | | try self.writeGotEntry(got_index); |
| 3800 | | |
| 3801 | | try self.writeLocalSymbol(decl.link.macho.local_sym_index); |
| 3802 | | if (self.d_sym) |*ds| |
| 3803 | | try ds.writeLocalSymbol(decl.link.macho.local_sym_index); |
| 3804 | | } |
| 3805 | | |
| 3806 | | // Resolve relocations |
| 3807 | | try decl.link.macho.resolveRelocs(self); |
| 3808 | | // TODO this requires further investigation: should we dispose of resolved relocs, or keep them |
| 3809 | | // so that we can reapply them when moving/growing sections? |
| 3810 | | decl.link.macho.relocs.clearAndFree(self.base.allocator); |
| 3811 | | |
| 3812 | | // Apply pending updates |
| 3813 | | while (self.pending_updates.popOrNull()) |update| { |
| 3814 | | switch (update.kind) { |
| 3815 | | .got => unreachable, |
| 3816 | | .stub => { |
| 3817 | | try self.writeStub(update.index); |
| 3818 | | try self.writeStubInStubHelper(update.index); |
| 3819 | | try self.writeLazySymbolPointer(update.index); |
| 3820 | | self.rebase_info_dirty = true; |
| 3821 | | self.lazy_binding_info_dirty = true; |
| 3822 | | }, |
| 3823 | | } |
| 3824 | | } |
| 3825 | | |
| 3826 | | return symbol; |
| 3827 | | } |
| 3828 | | |
| 3829 | | fn writeCode(self: *MachO, symbol: *macho.nlist_64, code: []const u8) !void { |
| 3830 | | const text_segment = &self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 3831 | | const text_section = text_segment.sections.items[self.text_section_index.?]; |
| 3832 | | const section_offset = symbol.n_value - text_section.addr; |
| 3833 | | const file_offset = text_section.offset + section_offset; |
| 3834 | | log.debug("writing code for symbol {s} at file offset 0x{x}", .{ self.getString(symbol.n_strx), file_offset }); |
| 3835 | | try self.base.file.?.pwriteAll(code, file_offset); |
| 3836 | | } |
| 3837 | | |
| 3838 | | pub fn updateDeclLineNumber(self: *MachO, module: *Module, decl: *const Module.Decl) !void { |
| 3839 | | if (self.d_sym) |*ds| { |
| 3840 | | try ds.updateDeclLineNumber(module, decl); |
| 3841 | | } |
| 3842 | | } |
| 3843 | | |
| 3844 | | pub fn updateDeclExports( |
| 3845 | | self: *MachO, |
| 3846 | | module: *Module, |
| 3847 | | decl: *Module.Decl, |
| 3848 | | exports: []const *Module.Export, |
| 3849 | | ) !void { |
| 3850 | | if (build_options.skip_non_native and builtin.object_format != .macho) { |
| 3851 | | @panic("Attempted to compile for object format that was disabled by build configuration"); |
| 3852 | | } |
| 3853 | | if (build_options.have_llvm) { |
| 3854 | | if (self.llvm_object) |llvm_object| return llvm_object.updateDeclExports(module, decl, exports); |
| 3855 | | } |
| 3856 | | const tracy = trace(@src()); |
| 3857 | | defer tracy.end(); |
| 3858 | | |
| 3859 | | try self.globals.ensureCapacity(self.base.allocator, self.globals.items.len + exports.len); |
| 3860 | | if (decl.link.macho.local_sym_index == 0) return; |
| 3861 | | const decl_sym = &self.locals.items[decl.link.macho.local_sym_index]; |
| 3862 | | |
| 3863 | | for (exports) |exp| { |
| 3864 | | const exp_name = try std.fmt.allocPrint(self.base.allocator, "_{s}", .{exp.options.name}); |
| 3865 | | defer self.base.allocator.free(exp_name); |
| 3866 | | |
| 3867 | | if (exp.options.section) |section_name| { |
| 3868 | | if (!mem.eql(u8, section_name, "__text")) { |
| 3869 | | try module.failed_exports.ensureCapacity(module.gpa, module.failed_exports.count() + 1); |
| 3870 | | module.failed_exports.putAssumeCapacityNoClobber( |
| 3871 | | exp, |
| 3872 | | try Module.ErrorMsg.create(self.base.allocator, decl.srcLoc(), "Unimplemented: ExportOptions.section", .{}), |
| 3873 | | ); |
| 3874 | | continue; |
| 3875 | | } |
| 3876 | | } |
| 3877 | | |
| 3878 | | var n_type: u8 = macho.N_SECT | macho.N_EXT; |
| 3879 | | var n_desc: u16 = 0; |
| 3880 | | |
| 3881 | | switch (exp.options.linkage) { |
| 3882 | | .Internal => { |
| 3883 | | // Symbol should be hidden, or in MachO lingo, private extern. |
| 3884 | | // We should also mark the symbol as Weak: n_desc == N_WEAK_DEF. |
| 3885 | | // TODO work out when to add N_WEAK_REF. |
| 3886 | | n_type |= macho.N_PEXT; |
| 3887 | | n_desc |= macho.N_WEAK_DEF; |
| 3888 | | }, |
| 3889 | | .Strong => { |
| 3890 | | // Check if the export is _main, and note if os. |
| 3891 | | // Otherwise, don't do anything since we already have all the flags |
| 3892 | | // set that we need for global (strong) linkage. |
| 3893 | | // n_type == N_SECT | N_EXT |
| 3894 | | if (mem.eql(u8, exp_name, "_main")) { |
| 3895 | | self.entry_addr = decl_sym.n_value; |
| 3896 | | } |
| 3897 | | }, |
| 3898 | | .Weak => { |
| 3899 | | // Weak linkage is specified as part of n_desc field. |
| 3900 | | // Symbol's n_type is like for a symbol with strong linkage. |
| 3901 | | n_desc |= macho.N_WEAK_DEF; |
| 3902 | | }, |
| 3903 | | .LinkOnce => { |
| 3904 | | try module.failed_exports.ensureCapacity(module.gpa, module.failed_exports.count() + 1); |
| 3905 | | module.failed_exports.putAssumeCapacityNoClobber( |
| 3906 | | exp, |
| 3907 | | try Module.ErrorMsg.create(self.base.allocator, decl.srcLoc(), "Unimplemented: GlobalLinkage.LinkOnce", .{}), |
| 3908 | | ); |
| 3909 | | continue; |
| 3910 | | }, |
| 3911 | | } |
| 3912 | | |
| 3913 | | if (exp.link.macho.sym_index) |i| { |
| 3914 | | const sym = &self.globals.items[i]; |
| 3915 | | sym.* = .{ |
| 3916 | | .n_strx = sym.n_strx, |
| 3917 | | .n_type = n_type, |
| 3918 | | .n_sect = @intCast(u8, self.text_section_index.?) + 1, |
| 3919 | | .n_desc = n_desc, |
| 3920 | | .n_value = decl_sym.n_value, |
| 3921 | | }; |
| 3922 | | } else { |
| 3923 | | const name_str_index = try self.makeString(exp_name); |
| 3924 | | const i = if (self.globals_free_list.popOrNull()) |i| i else blk: { |
| 3925 | | _ = self.globals.addOneAssumeCapacity(); |
| 3926 | | self.export_info_dirty = true; |
| 3927 | | break :blk @intCast(u32, self.globals.items.len - 1); |
| 3928 | | }; |
| 3929 | | self.globals.items[i] = .{ |
| 3930 | | .n_strx = name_str_index, |
| 3931 | | .n_type = n_type, |
| 3932 | | .n_sect = @intCast(u8, self.text_section_index.?) + 1, |
| 3933 | | .n_desc = n_desc, |
| 3934 | | .n_value = decl_sym.n_value, |
| 3935 | | }; |
| 3936 | | const resolv = try self.symbol_resolver.getOrPut(self.base.allocator, name_str_index); |
| 3937 | | resolv.value_ptr.* = .{ |
| 3938 | | .where = .global, |
| 3939 | | .where_index = i, |
| 3940 | | .local_sym_index = decl.link.macho.local_sym_index, |
| 3941 | | }; |
| 3942 | | |
| 3943 | | exp.link.macho.sym_index = @intCast(u32, i); |
| 3944 | | } |
| 3945 | | } |
| 3946 | | } |
| 3947 | | |
| 3948 | | pub fn deleteExport(self: *MachO, exp: Export) void { |
| 3949 | | const sym_index = exp.sym_index orelse return; |
| 3950 | | self.globals_free_list.append(self.base.allocator, sym_index) catch {}; |
| 3951 | | self.globals.items[sym_index].n_type = 0; |
| 3952 | | } |
| 3953 | | |
| 3954 | | pub fn freeDecl(self: *MachO, decl: *Module.Decl) void { |
| 3955 | | log.debug("freeDecl {*}", .{decl}); |
| 3956 | | _ = self.decls.swapRemove(decl); |
| 3957 | | // Appending to free lists is allowed to fail because the free lists are heuristics based anyway. |
| 3958 | | self.freeTextBlock(&decl.link.macho); |
| 3959 | | if (decl.link.macho.local_sym_index != 0) { |
| 3960 | | self.locals_free_list.append(self.base.allocator, decl.link.macho.local_sym_index) catch {}; |
| 3961 | | |
| 3962 | | const got_key = GotIndirectionKey{ |
| 3963 | | .where = .local, |
| 3964 | | .where_index = decl.link.macho.local_sym_index, |
| 3965 | | }; |
| 3966 | | const got_index = self.got_entries_map.get(got_key) orelse unreachable; |
| 3967 | | _ = self.got_entries_map.remove(got_key); |
| 3968 | | self.got_entries_free_list.append(self.base.allocator, got_index) catch {}; |
| 3969 | | |
| 3970 | | self.locals.items[decl.link.macho.local_sym_index].n_type = 0; |
| 3971 | | decl.link.macho.local_sym_index = 0; |
| 3972 | | } |
| 3973 | | if (self.d_sym) |*ds| { |
| 3974 | | // TODO make this logic match freeTextBlock. Maybe abstract the logic |
| 3975 | | // out since the same thing is desired for both. |
| 3976 | | _ = ds.dbg_line_fn_free_list.remove(&decl.fn_link.macho); |
| 3977 | | if (decl.fn_link.macho.prev) |prev| { |
| 3978 | | ds.dbg_line_fn_free_list.put(self.base.allocator, prev, {}) catch {}; |
| 3979 | | prev.next = decl.fn_link.macho.next; |
| 3980 | | if (decl.fn_link.macho.next) |next| { |
| 3981 | | next.prev = prev; |
| 3982 | | } else { |
| 3983 | | ds.dbg_line_fn_last = prev; |
| 3984 | | } |
| 3985 | | } else if (decl.fn_link.macho.next) |next| { |
| 3986 | | ds.dbg_line_fn_first = next; |
| 3987 | | next.prev = null; |
| 3988 | | } |
| 3989 | | if (ds.dbg_line_fn_first == &decl.fn_link.macho) { |
| 3990 | | ds.dbg_line_fn_first = decl.fn_link.macho.next; |
| 3991 | | } |
| 3992 | | if (ds.dbg_line_fn_last == &decl.fn_link.macho) { |
| 3993 | | ds.dbg_line_fn_last = decl.fn_link.macho.prev; |
| 3994 | | } |
| 3995 | | } |
| 3996 | | } |
| 3997 | | |
| 3998 | | pub fn getDeclVAddr(self: *MachO, decl: *const Module.Decl) u64 { |
| 3999 | | assert(decl.link.macho.local_sym_index != 0); |
| 4000 | | return self.locals.items[decl.link.macho.local_sym_index].n_value; |
| 4001 | | } |
| 4002 | | |
| 4003 | | pub fn populateMissingMetadata(self: *MachO) !void { |
| 4004 | | switch (self.base.options.output_mode) { |
| 4005 | | .Exe => {}, |
| 4006 | | .Obj => return error.TODOImplementWritingObjFiles, |
| 4007 | | .Lib => return error.TODOImplementWritingLibFiles, |
| 4008 | | } |
| 4009 | | |
| 4010 | | if (self.pagezero_segment_cmd_index == null) { |
| 4011 | | self.pagezero_segment_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 4012 | | try self.load_commands.append(self.base.allocator, .{ |
| 4013 | | .Segment = SegmentCommand.empty("__PAGEZERO", .{ |
| 4014 | | .vmsize = 0x100000000, // size always set to 4GB |
| 4015 | | }), |
| 4016 | | }); |
| 4017 | | self.load_commands_dirty = true; |
| 4018 | | } |
| 4019 | | if (self.text_segment_cmd_index == null) { |
| 4020 | | self.text_segment_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 4021 | | const maxprot = macho.VM_PROT_READ | macho.VM_PROT_WRITE | macho.VM_PROT_EXECUTE; |
| 4022 | | const initprot = macho.VM_PROT_READ | macho.VM_PROT_EXECUTE; |
| 4023 | | |
| 4024 | | const program_code_size_hint = self.base.options.program_code_size_hint; |
| 4025 | | const got_size_hint = @sizeOf(u64) * self.base.options.symbol_count_hint; |
| 4026 | | const ideal_size = self.header_pad + program_code_size_hint + 3 * got_size_hint; |
| 4027 | | const needed_size = mem.alignForwardGeneric(u64, padToIdeal(ideal_size), self.page_size); |
| 4028 | | |
| 4029 | | log.debug("found __TEXT segment free space 0x{x} to 0x{x}", .{ 0, needed_size }); |
| 4030 | | |
| 4031 | | try self.load_commands.append(self.base.allocator, .{ |
| 4032 | | .Segment = SegmentCommand.empty("__TEXT", .{ |
| 4033 | | .vmaddr = 0x100000000, // always starts at 4GB |
| 4034 | | .vmsize = needed_size, |
| 4035 | | .filesize = needed_size, |
| 4036 | | .maxprot = maxprot, |
| 4037 | | .initprot = initprot, |
| 4038 | | }), |
| 4039 | | }); |
| 4040 | | self.load_commands_dirty = true; |
| 4041 | | } |
| 4042 | | if (self.text_section_index == null) { |
| 4043 | | const text_segment = &self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 4044 | | self.text_section_index = @intCast(u16, text_segment.sections.items.len); |
| 4045 | | |
| 4046 | | const alignment: u2 = switch (self.base.options.target.cpu.arch) { |
| 4047 | | .x86_64 => 0, |
| 4048 | | .aarch64 => 2, |
| 4049 | | else => unreachable, // unhandled architecture type |
| 4050 | | }; |
| 4051 | | const flags = macho.S_REGULAR | macho.S_ATTR_PURE_INSTRUCTIONS | macho.S_ATTR_SOME_INSTRUCTIONS; |
| 4052 | | const needed_size = self.base.options.program_code_size_hint; |
| 4053 | | const off = text_segment.findFreeSpace(needed_size, @as(u16, 1) << alignment, self.header_pad); |
| 4054 | | |
| 4055 | | log.debug("found __text section free space 0x{x} to 0x{x}", .{ off, off + needed_size }); |
| 4056 | | |
| 4057 | | try text_segment.addSection(self.base.allocator, "__text", .{ |
| 4058 | | .addr = text_segment.inner.vmaddr + off, |
| 4059 | | .size = @intCast(u32, needed_size), |
| 4060 | | .offset = @intCast(u32, off), |
| 4061 | | .@"align" = alignment, |
| 4062 | | .flags = flags, |
| 4063 | | }); |
| 4064 | | self.load_commands_dirty = true; |
| 4065 | | } |
| 4066 | | if (self.stubs_section_index == null) { |
| 4067 | | const text_segment = &self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 4068 | | self.stubs_section_index = @intCast(u16, text_segment.sections.items.len); |
| 4069 | | |
| 4070 | | const alignment: u2 = switch (self.base.options.target.cpu.arch) { |
| 4071 | | .x86_64 => 0, |
| 4072 | | .aarch64 => 2, |
| 4073 | | else => unreachable, // unhandled architecture type |
| 4074 | | }; |
| 4075 | | const stub_size: u4 = switch (self.base.options.target.cpu.arch) { |
| 4076 | | .x86_64 => 6, |
| 4077 | | .aarch64 => 3 * @sizeOf(u32), |
| 4078 | | else => unreachable, // unhandled architecture type |
| 4079 | | }; |
| 4080 | | const flags = macho.S_SYMBOL_STUBS | macho.S_ATTR_PURE_INSTRUCTIONS | macho.S_ATTR_SOME_INSTRUCTIONS; |
| 4081 | | const needed_size = @sizeOf(u64) * self.base.options.symbol_count_hint; |
| 4082 | | const off = text_segment.findFreeSpace(needed_size, @alignOf(u64), self.header_pad); |
| 4083 | | assert(off + needed_size <= text_segment.inner.fileoff + text_segment.inner.filesize); // TODO Must expand __TEXT segment. |
| 4084 | | |
| 4085 | | log.debug("found __stubs section free space 0x{x} to 0x{x}", .{ off, off + needed_size }); |
| 4086 | | |
| 4087 | | try text_segment.addSection(self.base.allocator, "__stubs", .{ |
| 4088 | | .addr = text_segment.inner.vmaddr + off, |
| 4089 | | .size = needed_size, |
| 4090 | | .offset = @intCast(u32, off), |
| 4091 | | .@"align" = alignment, |
| 4092 | | .flags = flags, |
| 4093 | | .reserved2 = stub_size, |
| 4094 | | }); |
| 4095 | | self.load_commands_dirty = true; |
| 4096 | | } |
| 4097 | | if (self.stub_helper_section_index == null) { |
| 4098 | | const text_segment = &self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 4099 | | self.stub_helper_section_index = @intCast(u16, text_segment.sections.items.len); |
| 4100 | | |
| 4101 | | const alignment: u2 = switch (self.base.options.target.cpu.arch) { |
| 4102 | | .x86_64 => 0, |
| 4103 | | .aarch64 => 2, |
| 4104 | | else => unreachable, // unhandled architecture type |
| 4105 | | }; |
| 4106 | | const flags = macho.S_REGULAR | macho.S_ATTR_PURE_INSTRUCTIONS | macho.S_ATTR_SOME_INSTRUCTIONS; |
| 4107 | | const needed_size = @sizeOf(u64) * self.base.options.symbol_count_hint; |
| 4108 | | const off = text_segment.findFreeSpace(needed_size, @alignOf(u64), self.header_pad); |
| 4109 | | assert(off + needed_size <= text_segment.inner.fileoff + text_segment.inner.filesize); // TODO Must expand __TEXT segment. |
| 4110 | | |
| 4111 | | log.debug("found __stub_helper section free space 0x{x} to 0x{x}", .{ off, off + needed_size }); |
| 4112 | | |
| 4113 | | try text_segment.addSection(self.base.allocator, "__stub_helper", .{ |
| 4114 | | .addr = text_segment.inner.vmaddr + off, |
| 4115 | | .size = needed_size, |
| 4116 | | .offset = @intCast(u32, off), |
| 4117 | | .@"align" = alignment, |
| 4118 | | .flags = flags, |
| 4119 | | }); |
| 4120 | | self.load_commands_dirty = true; |
| 4121 | | } |
| 4122 | | if (self.data_const_segment_cmd_index == null) { |
| 4123 | | self.data_const_segment_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 4124 | | const maxprot = macho.VM_PROT_READ | macho.VM_PROT_WRITE | macho.VM_PROT_EXECUTE; |
| 4125 | | const initprot = macho.VM_PROT_READ | macho.VM_PROT_WRITE; |
| 4126 | | const address_and_offset = self.nextSegmentAddressAndOffset(); |
| 4127 | | |
| 4128 | | const ideal_size = @sizeOf(u64) * self.base.options.symbol_count_hint; |
| 4129 | | const needed_size = mem.alignForwardGeneric(u64, padToIdeal(ideal_size), self.page_size); |
| 4130 | | |
| 4131 | | log.debug("found __DATA_CONST segment free space 0x{x} to 0x{x}", .{ address_and_offset.offset, address_and_offset.offset + needed_size }); |
| 4132 | | |
| 4133 | | try self.load_commands.append(self.base.allocator, .{ |
| 4134 | | .Segment = SegmentCommand.empty("__DATA_CONST", .{ |
| 4135 | | .vmaddr = address_and_offset.address, |
| 4136 | | .vmsize = needed_size, |
| 4137 | | .fileoff = address_and_offset.offset, |
| 4138 | | .filesize = needed_size, |
| 4139 | | .maxprot = maxprot, |
| 4140 | | .initprot = initprot, |
| 4141 | | }), |
| 4142 | | }); |
| 4143 | | self.load_commands_dirty = true; |
| 4144 | | } |
| 4145 | | if (self.got_section_index == null) { |
| 4146 | | const dc_segment = &self.load_commands.items[self.data_const_segment_cmd_index.?].Segment; |
| 4147 | | self.got_section_index = @intCast(u16, dc_segment.sections.items.len); |
| 4148 | | |
| 4149 | | const flags = macho.S_NON_LAZY_SYMBOL_POINTERS; |
| 4150 | | const needed_size = @sizeOf(u64) * self.base.options.symbol_count_hint; |
| 4151 | | const off = dc_segment.findFreeSpace(needed_size, @alignOf(u64), null); |
| 4152 | | assert(off + needed_size <= dc_segment.inner.fileoff + dc_segment.inner.filesize); // TODO Must expand __DATA_CONST segment. |
| 4153 | | |
| 4154 | | log.debug("found __got section free space 0x{x} to 0x{x}", .{ off, off + needed_size }); |
| 4155 | | |
| 4156 | | try dc_segment.addSection(self.base.allocator, "__got", .{ |
| 4157 | | .addr = dc_segment.inner.vmaddr + off - dc_segment.inner.fileoff, |
| 4158 | | .size = needed_size, |
| 4159 | | .offset = @intCast(u32, off), |
| 4160 | | .@"align" = 3, // 2^3 = @sizeOf(u64) |
| 4161 | | .flags = flags, |
| 4162 | | }); |
| 4163 | | self.load_commands_dirty = true; |
| 4164 | | } |
| 4165 | | if (self.data_segment_cmd_index == null) { |
| 4166 | | self.data_segment_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 4167 | | const maxprot = macho.VM_PROT_READ | macho.VM_PROT_WRITE | macho.VM_PROT_EXECUTE; |
| 4168 | | const initprot = macho.VM_PROT_READ | macho.VM_PROT_WRITE; |
| 4169 | | const address_and_offset = self.nextSegmentAddressAndOffset(); |
| 4170 | | |
| 4171 | | const ideal_size = 2 * @sizeOf(u64) * self.base.options.symbol_count_hint; |
| 4172 | | const needed_size = mem.alignForwardGeneric(u64, padToIdeal(ideal_size), self.page_size); |
| 4173 | | |
| 4174 | | log.debug("found __DATA segment free space 0x{x} to 0x{x}", .{ address_and_offset.offset, address_and_offset.offset + needed_size }); |
| 4175 | | |
| 4176 | | try self.load_commands.append(self.base.allocator, .{ |
| 4177 | | .Segment = SegmentCommand.empty("__DATA", .{ |
| 4178 | | .vmaddr = address_and_offset.address, |
| 4179 | | .vmsize = needed_size, |
| 4180 | | .fileoff = address_and_offset.offset, |
| 4181 | | .filesize = needed_size, |
| 4182 | | .maxprot = maxprot, |
| 4183 | | .initprot = initprot, |
| 4184 | | }), |
| 4185 | | }); |
| 4186 | | self.load_commands_dirty = true; |
| 4187 | | } |
| 4188 | | if (self.la_symbol_ptr_section_index == null) { |
| 4189 | | const data_segment = &self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 4190 | | self.la_symbol_ptr_section_index = @intCast(u16, data_segment.sections.items.len); |
| 4191 | | |
| 4192 | | const flags = macho.S_LAZY_SYMBOL_POINTERS; |
| 4193 | | const needed_size = @sizeOf(u64) * self.base.options.symbol_count_hint; |
| 4194 | | const off = data_segment.findFreeSpace(needed_size, @alignOf(u64), null); |
| 4195 | | assert(off + needed_size <= data_segment.inner.fileoff + data_segment.inner.filesize); // TODO Must expand __DATA segment. |
| 4196 | | |
| 4197 | | log.debug("found __la_symbol_ptr section free space 0x{x} to 0x{x}", .{ off, off + needed_size }); |
| 4198 | | |
| 4199 | | try data_segment.addSection(self.base.allocator, "__la_symbol_ptr", .{ |
| 4200 | | .addr = data_segment.inner.vmaddr + off - data_segment.inner.fileoff, |
| 4201 | | .size = needed_size, |
| 4202 | | .offset = @intCast(u32, off), |
| 4203 | | .@"align" = 3, // 2^3 = @sizeOf(u64) |
| 4204 | | .flags = flags, |
| 4205 | | }); |
| 4206 | | self.load_commands_dirty = true; |
| 4207 | | } |
| 4208 | | if (self.data_section_index == null) { |
| 4209 | | const data_segment = &self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 4210 | | self.data_section_index = @intCast(u16, data_segment.sections.items.len); |
| 4211 | | |
| 4212 | | const needed_size = @sizeOf(u64) * self.base.options.symbol_count_hint; |
| 4213 | | const off = data_segment.findFreeSpace(needed_size, @alignOf(u64), null); |
| 4214 | | assert(off + needed_size <= data_segment.inner.fileoff + data_segment.inner.filesize); // TODO Must expand __DATA segment. |
| 4215 | | |
| 4216 | | log.debug("found __data section free space 0x{x} to 0x{x}", .{ off, off + needed_size }); |
| 4217 | | |
| 4218 | | try data_segment.addSection(self.base.allocator, "__data", .{ |
| 4219 | | .addr = data_segment.inner.vmaddr + off - data_segment.inner.fileoff, |
| 4220 | | .size = needed_size, |
| 4221 | | .offset = @intCast(u32, off), |
| 4222 | | .@"align" = 3, // 2^3 = @sizeOf(u64) |
| 4223 | | }); |
| 4224 | | self.load_commands_dirty = true; |
| 4225 | | } |
| 4226 | | if (self.linkedit_segment_cmd_index == null) { |
| 4227 | | self.linkedit_segment_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 4228 | | |
| 4229 | | const maxprot = macho.VM_PROT_READ | macho.VM_PROT_WRITE | macho.VM_PROT_EXECUTE; |
| 4230 | | const initprot = macho.VM_PROT_READ; |
| 4231 | | const address_and_offset = self.nextSegmentAddressAndOffset(); |
| 4232 | | |
| 4233 | | log.debug("found __LINKEDIT segment free space at 0x{x}", .{address_and_offset.offset}); |
| 4234 | | |
| 4235 | | try self.load_commands.append(self.base.allocator, .{ |
| 4236 | | .Segment = SegmentCommand.empty("__LINKEDIT", .{ |
| 4237 | | .vmaddr = address_and_offset.address, |
| 4238 | | .fileoff = address_and_offset.offset, |
| 4239 | | .maxprot = maxprot, |
| 4240 | | .initprot = initprot, |
| 4241 | | }), |
| 4242 | | }); |
| 4243 | | self.load_commands_dirty = true; |
| 4244 | | } |
| 4245 | | if (self.dyld_info_cmd_index == null) { |
| 4246 | | self.dyld_info_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 4247 | | |
| 4248 | | try self.load_commands.append(self.base.allocator, .{ |
| 4249 | | .DyldInfoOnly = .{ |
| 4250 | | .cmd = macho.LC_DYLD_INFO_ONLY, |
| 4251 | | .cmdsize = @sizeOf(macho.dyld_info_command), |
| 4252 | | .rebase_off = 0, |
| 4253 | | .rebase_size = 0, |
| 4254 | | .bind_off = 0, |
| 4255 | | .bind_size = 0, |
| 4256 | | .weak_bind_off = 0, |
| 4257 | | .weak_bind_size = 0, |
| 4258 | | .lazy_bind_off = 0, |
| 4259 | | .lazy_bind_size = 0, |
| 4260 | | .export_off = 0, |
| 4261 | | .export_size = 0, |
| 4262 | | }, |
| 4263 | | }); |
| 4264 | | |
| 4265 | | const dyld = &self.load_commands.items[self.dyld_info_cmd_index.?].DyldInfoOnly; |
| 4266 | | |
| 4267 | | // Preallocate rebase, binding, lazy binding info, and export info. |
| 4268 | | const expected_size = 48; // TODO This is totally random. |
| 4269 | | const rebase_off = self.findFreeSpaceLinkedit(expected_size, 1, null); |
| 4270 | | log.debug("found rebase info free space 0x{x} to 0x{x}", .{ rebase_off, rebase_off + expected_size }); |
| 4271 | | dyld.rebase_off = @intCast(u32, rebase_off); |
| 4272 | | dyld.rebase_size = expected_size; |
| 4273 | | |
| 4274 | | const bind_off = self.findFreeSpaceLinkedit(expected_size, 1, null); |
| 4275 | | log.debug("found binding info free space 0x{x} to 0x{x}", .{ bind_off, bind_off + expected_size }); |
| 4276 | | dyld.bind_off = @intCast(u32, bind_off); |
| 4277 | | dyld.bind_size = expected_size; |
| 4278 | | |
| 4279 | | const lazy_bind_off = self.findFreeSpaceLinkedit(expected_size, 1, null); |
| 4280 | | log.debug("found lazy binding info free space 0x{x} to 0x{x}", .{ lazy_bind_off, lazy_bind_off + expected_size }); |
| 4281 | | dyld.lazy_bind_off = @intCast(u32, lazy_bind_off); |
| 4282 | | dyld.lazy_bind_size = expected_size; |
| 4283 | | |
| 4284 | | const export_off = self.findFreeSpaceLinkedit(expected_size, 1, null); |
| 4285 | | log.debug("found export info free space 0x{x} to 0x{x}", .{ export_off, export_off + expected_size }); |
| 4286 | | dyld.export_off = @intCast(u32, export_off); |
| 4287 | | dyld.export_size = expected_size; |
| 4288 | | |
| 4289 | | self.load_commands_dirty = true; |
| 4290 | | } |
| 4291 | | if (self.symtab_cmd_index == null) { |
| 4292 | | self.symtab_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 4293 | | |
| 4294 | | try self.load_commands.append(self.base.allocator, .{ |
| 4295 | | .Symtab = .{ |
| 4296 | | .cmd = macho.LC_SYMTAB, |
| 4297 | | .cmdsize = @sizeOf(macho.symtab_command), |
| 4298 | | .symoff = 0, |
| 4299 | | .nsyms = 0, |
| 4300 | | .stroff = 0, |
| 4301 | | .strsize = 0, |
| 4302 | | }, |
| 4303 | | }); |
| 4304 | | |
| 4305 | | const symtab = &self.load_commands.items[self.symtab_cmd_index.?].Symtab; |
| 4306 | | |
| 4307 | | const symtab_size = self.base.options.symbol_count_hint * @sizeOf(macho.nlist_64); |
| 4308 | | const symtab_off = self.findFreeSpaceLinkedit(symtab_size, @sizeOf(macho.nlist_64), null); |
| 4309 | | log.debug("found symbol table free space 0x{x} to 0x{x}", .{ symtab_off, symtab_off + symtab_size }); |
| 4310 | | symtab.symoff = @intCast(u32, symtab_off); |
| 4311 | | symtab.nsyms = @intCast(u32, self.base.options.symbol_count_hint); |
| 4312 | | |
| 4313 | | try self.strtab.append(self.base.allocator, 0); |
| 4314 | | const strtab_size = self.strtab.items.len; |
| 4315 | | const strtab_off = self.findFreeSpaceLinkedit(strtab_size, 1, symtab_off); |
| 4316 | | log.debug("found string table free space 0x{x} to 0x{x}", .{ strtab_off, strtab_off + strtab_size }); |
| 4317 | | symtab.stroff = @intCast(u32, strtab_off); |
| 4318 | | symtab.strsize = @intCast(u32, strtab_size); |
| 4319 | | |
| 4320 | | self.load_commands_dirty = true; |
| 4321 | | self.strtab_dirty = true; |
| 4322 | | } |
| 4323 | | if (self.dysymtab_cmd_index == null) { |
| 4324 | | self.dysymtab_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 4325 | | |
| 4326 | | // Preallocate space for indirect symbol table. |
| 4327 | | const indsymtab_size = self.base.options.symbol_count_hint * @sizeOf(u64); // Each entry is just a u64. |
| 4328 | | const indsymtab_off = self.findFreeSpaceLinkedit(indsymtab_size, @sizeOf(u64), null); |
| 4329 | | |
| 4330 | | log.debug("found indirect symbol table free space 0x{x} to 0x{x}", .{ indsymtab_off, indsymtab_off + indsymtab_size }); |
| 4331 | | |
| 4332 | | try self.load_commands.append(self.base.allocator, .{ |
| 4333 | | .Dysymtab = .{ |
| 4334 | | .cmd = macho.LC_DYSYMTAB, |
| 4335 | | .cmdsize = @sizeOf(macho.dysymtab_command), |
| 4336 | | .ilocalsym = 0, |
| 4337 | | .nlocalsym = 0, |
| 4338 | | .iextdefsym = 0, |
| 4339 | | .nextdefsym = 0, |
| 4340 | | .iundefsym = 0, |
| 4341 | | .nundefsym = 0, |
| 4342 | | .tocoff = 0, |
| 4343 | | .ntoc = 0, |
| 4344 | | .modtaboff = 0, |
| 4345 | | .nmodtab = 0, |
| 4346 | | .extrefsymoff = 0, |
| 4347 | | .nextrefsyms = 0, |
| 4348 | | .indirectsymoff = @intCast(u32, indsymtab_off), |
| 4349 | | .nindirectsyms = @intCast(u32, self.base.options.symbol_count_hint), |
| 4350 | | .extreloff = 0, |
| 4351 | | .nextrel = 0, |
| 4352 | | .locreloff = 0, |
| 4353 | | .nlocrel = 0, |
| 4354 | | }, |
| 4355 | | }); |
| 4356 | | self.load_commands_dirty = true; |
| 4357 | | } |
| 4358 | | if (self.dylinker_cmd_index == null) { |
| 4359 | | self.dylinker_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 4360 | | const cmdsize = @intCast(u32, mem.alignForwardGeneric( |
| 4361 | | u64, |
| 4362 | | @sizeOf(macho.dylinker_command) + mem.lenZ(DEFAULT_DYLD_PATH), |
| 4363 | | @sizeOf(u64), |
| 4364 | | )); |
| 4365 | | var dylinker_cmd = commands.emptyGenericCommandWithData(macho.dylinker_command{ |
| 4366 | | .cmd = macho.LC_LOAD_DYLINKER, |
| 4367 | | .cmdsize = cmdsize, |
| 4368 | | .name = @sizeOf(macho.dylinker_command), |
| 4369 | | }); |
| 4370 | | dylinker_cmd.data = try self.base.allocator.alloc(u8, cmdsize - dylinker_cmd.inner.name); |
| 4371 | | mem.set(u8, dylinker_cmd.data, 0); |
| 4372 | | mem.copy(u8, dylinker_cmd.data, mem.spanZ(DEFAULT_DYLD_PATH)); |
| 4373 | | try self.load_commands.append(self.base.allocator, .{ .Dylinker = dylinker_cmd }); |
| 4374 | | self.load_commands_dirty = true; |
| 4375 | | } |
| 4376 | | if (self.libsystem_cmd_index == null) { |
| 4377 | | self.libsystem_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 4378 | | |
| 4379 | | var dylib_cmd = try commands.createLoadDylibCommand(self.base.allocator, mem.spanZ(LIB_SYSTEM_PATH), 2, 0, 0); |
| 4380 | | errdefer dylib_cmd.deinit(self.base.allocator); |
| 4381 | | |
| 4382 | | try self.load_commands.append(self.base.allocator, .{ .Dylib = dylib_cmd }); |
| 4383 | | |
| 4384 | | self.load_commands_dirty = true; |
| 4385 | | } |
| 4386 | | if (self.main_cmd_index == null) { |
| 4387 | | self.main_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 4388 | | try self.load_commands.append(self.base.allocator, .{ |
| 4389 | | .Main = .{ |
| 4390 | | .cmd = macho.LC_MAIN, |
| 4391 | | .cmdsize = @sizeOf(macho.entry_point_command), |
| 4392 | | .entryoff = 0x0, |
| 4393 | | .stacksize = 0, |
| 4394 | | }, |
| 4395 | | }); |
| 4396 | | self.load_commands_dirty = true; |
| 4397 | | } |
| 4398 | | if (self.build_version_cmd_index == null) { |
| 4399 | | self.build_version_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 4400 | | const cmdsize = @intCast(u32, mem.alignForwardGeneric( |
| 4401 | | u64, |
| 4402 | | @sizeOf(macho.build_version_command) + @sizeOf(macho.build_tool_version), |
| 4403 | | @sizeOf(u64), |
| 4404 | | )); |
| 4405 | | const ver = self.base.options.target.os.version_range.semver.min; |
| 4406 | | const version = ver.major << 16 | ver.minor << 8 | ver.patch; |
| 4407 | | const is_simulator_abi = self.base.options.target.abi == .simulator; |
| 4408 | | var cmd = commands.emptyGenericCommandWithData(macho.build_version_command{ |
| 4409 | | .cmd = macho.LC_BUILD_VERSION, |
| 4410 | | .cmdsize = cmdsize, |
| 4411 | | .platform = switch (self.base.options.target.os.tag) { |
| 4412 | | .macos => macho.PLATFORM_MACOS, |
| 4413 | | .ios => if (is_simulator_abi) macho.PLATFORM_IOSSIMULATOR else macho.PLATFORM_IOS, |
| 4414 | | .watchos => if (is_simulator_abi) macho.PLATFORM_WATCHOSSIMULATOR else macho.PLATFORM_WATCHOS, |
| 4415 | | .tvos => if (is_simulator_abi) macho.PLATFORM_TVOSSIMULATOR else macho.PLATFORM_TVOS, |
| 4416 | | else => unreachable, |
| 4417 | | }, |
| 4418 | | .minos = version, |
| 4419 | | .sdk = version, |
| 4420 | | .ntools = 1, |
| 4421 | | }); |
| 4422 | | const ld_ver = macho.build_tool_version{ |
| 4423 | | .tool = macho.TOOL_LD, |
| 4424 | | .version = 0x0, |
| 4425 | | }; |
| 4426 | | cmd.data = try self.base.allocator.alloc(u8, cmdsize - @sizeOf(macho.build_version_command)); |
| 4427 | | mem.set(u8, cmd.data, 0); |
| 4428 | | mem.copy(u8, cmd.data, mem.asBytes(&ld_ver)); |
| 4429 | | try self.load_commands.append(self.base.allocator, .{ .BuildVersion = cmd }); |
| 4430 | | } |
| 4431 | | if (self.source_version_cmd_index == null) { |
| 4432 | | self.source_version_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 4433 | | try self.load_commands.append(self.base.allocator, .{ |
| 4434 | | .SourceVersion = .{ |
| 4435 | | .cmd = macho.LC_SOURCE_VERSION, |
| 4436 | | .cmdsize = @sizeOf(macho.source_version_command), |
| 4437 | | .version = 0x0, |
| 4438 | | }, |
| 4439 | | }); |
| 4440 | | self.load_commands_dirty = true; |
| 4441 | | } |
| 4442 | | if (self.uuid_cmd_index == null) { |
| 4443 | | self.uuid_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 4444 | | var uuid_cmd: macho.uuid_command = .{ |
| 4445 | | .cmd = macho.LC_UUID, |
| 4446 | | .cmdsize = @sizeOf(macho.uuid_command), |
| 4447 | | .uuid = undefined, |
| 4448 | | }; |
| 4449 | | std.crypto.random.bytes(&uuid_cmd.uuid); |
| 4450 | | try self.load_commands.append(self.base.allocator, .{ .Uuid = uuid_cmd }); |
| 4451 | | self.load_commands_dirty = true; |
| 4452 | | } |
| 4453 | | if (self.code_signature_cmd_index == null and self.requires_adhoc_codesig) { |
| 4454 | | self.code_signature_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 4455 | | try self.load_commands.append(self.base.allocator, .{ |
| 4456 | | .LinkeditData = .{ |
| 4457 | | .cmd = macho.LC_CODE_SIGNATURE, |
| 4458 | | .cmdsize = @sizeOf(macho.linkedit_data_command), |
| 4459 | | .dataoff = 0, |
| 4460 | | .datasize = 0, |
| 4461 | | }, |
| 4462 | | }); |
| 4463 | | self.load_commands_dirty = true; |
| 4464 | | } |
| 4465 | | if (!self.strtab_dir.containsAdapted(@as([]const u8, "dyld_stub_binder"), StringIndexAdapter{ |
| 4466 | | .bytes = &self.strtab, |
| 4467 | | })) { |
| 4468 | | const import_sym_index = @intCast(u32, self.undefs.items.len); |
| 4469 | | const n_strx = try self.makeString("dyld_stub_binder"); |
| 4470 | | try self.undefs.append(self.base.allocator, .{ |
| 4471 | | .n_strx = n_strx, |
| 4472 | | .n_type = macho.N_UNDF | macho.N_EXT, |
| 4473 | | .n_sect = 0, |
| 4474 | | .n_desc = @intCast(u8, 1) * macho.N_SYMBOL_RESOLVER, |
| 4475 | | .n_value = 0, |
| 4476 | | }); |
| 4477 | | try self.symbol_resolver.putNoClobber(self.base.allocator, n_strx, .{ |
| 4478 | | .where = .undef, |
| 4479 | | .where_index = import_sym_index, |
| 4480 | | }); |
| 4481 | | const got_key = GotIndirectionKey{ |
| 4482 | | .where = .undef, |
| 4483 | | .where_index = import_sym_index, |
| 4484 | | }; |
| 4485 | | const got_index = @intCast(u32, self.got_entries.items.len); |
| 4486 | | try self.got_entries.append(self.base.allocator, got_key); |
| 4487 | | try self.got_entries_map.putNoClobber(self.base.allocator, got_key, got_index); |
| 4488 | | try self.writeGotEntry(got_index); |
| 4489 | | self.binding_info_dirty = true; |
| 4490 | | } |
| 4491 | | if (self.stub_helper_stubs_start_off == null) { |
| 4492 | | try self.writeStubHelperPreamble(); |
| 4493 | | } |
| 4494 | | } |
| 4495 | | |
| 4496 | | fn allocateTextBlock(self: *MachO, text_block: *TextBlock, new_block_size: u64, alignment: u64) !u64 { |
| 4497 | | const text_segment = &self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 4498 | | const text_section = &text_segment.sections.items[self.text_section_index.?]; |
| 4499 | | const new_block_ideal_capacity = padToIdeal(new_block_size); |
| 4500 | | |
| 4501 | | // We use these to indicate our intention to update metadata, placing the new block, |
| 4502 | | // and possibly removing a free list node. |
| 4503 | | // It would be simpler to do it inside the for loop below, but that would cause a |
| 4504 | | // problem if an error was returned later in the function. So this action |
| 4505 | | // is actually carried out at the end of the function, when errors are no longer possible. |
| 4506 | | var block_placement: ?*TextBlock = null; |
| 4507 | | var free_list_removal: ?usize = null; |
| 4508 | | |
| 4509 | | // First we look for an appropriately sized free list node. |
| 4510 | | // The list is unordered. We'll just take the first thing that works. |
| 4511 | | const vaddr = blk: { |
| 4512 | | var i: usize = 0; |
| 4513 | | while (i < self.text_block_free_list.items.len) { |
| 4514 | | const big_block = self.text_block_free_list.items[i]; |
| 4515 | | // We now have a pointer to a live text block that has too much capacity. |
| 4516 | | // Is it enough that we could fit this new text block? |
| 4517 | | const sym = self.locals.items[big_block.local_sym_index]; |
| 4518 | | const capacity = big_block.capacity(self.*); |
| 4519 | | const ideal_capacity = padToIdeal(capacity); |
| 4520 | | const ideal_capacity_end_vaddr = sym.n_value + ideal_capacity; |
| 4521 | | const capacity_end_vaddr = sym.n_value + capacity; |
| 4522 | | const new_start_vaddr_unaligned = capacity_end_vaddr - new_block_ideal_capacity; |
| 4523 | | const new_start_vaddr = mem.alignBackwardGeneric(u64, new_start_vaddr_unaligned, alignment); |
| 4524 | | if (new_start_vaddr < ideal_capacity_end_vaddr) { |
| 4525 | | // Additional bookkeeping here to notice if this free list node |
| 4526 | | // should be deleted because the block that it points to has grown to take up |
| 4527 | | // more of the extra capacity. |
| 4528 | | if (!big_block.freeListEligible(self.*)) { |
| 4529 | | const bl = self.text_block_free_list.swapRemove(i); |
| 4530 | | bl.deinit(self.base.allocator); |
| 4531 | | } else { |
| 4532 | | i += 1; |
| 4533 | | } |
| 4534 | | continue; |
| 4535 | | } |
| 4536 | | // At this point we know that we will place the new block here. But the |
| 4537 | | // remaining question is whether there is still yet enough capacity left |
| 4538 | | // over for there to still be a free list node. |
| 4539 | | const remaining_capacity = new_start_vaddr - ideal_capacity_end_vaddr; |
| 4540 | | const keep_free_list_node = remaining_capacity >= min_text_capacity; |
| 4541 | | |
| 4542 | | // Set up the metadata to be updated, after errors are no longer possible. |
| 4543 | | block_placement = big_block; |
| 4544 | | if (!keep_free_list_node) { |
| 4545 | | free_list_removal = i; |
| 4546 | | } |
| 4547 | | break :blk new_start_vaddr; |
| 4548 | | } else if (self.last_text_block) |last| { |
| 4549 | | const last_symbol = self.locals.items[last.local_sym_index]; |
| 4550 | | // TODO We should pad out the excess capacity with NOPs. For executables, |
| 4551 | | // no padding seems to be OK, but it will probably not be for objects. |
| 4552 | | const ideal_capacity = padToIdeal(last.size); |
| 4553 | | const ideal_capacity_end_vaddr = last_symbol.n_value + ideal_capacity; |
| 4554 | | const new_start_vaddr = mem.alignForwardGeneric(u64, ideal_capacity_end_vaddr, alignment); |
| 4555 | | block_placement = last; |
| 4556 | | break :blk new_start_vaddr; |
| 4557 | | } else { |
| 4558 | | break :blk text_section.addr; |
| 4559 | | } |
| 4560 | | }; |
| 4561 | | |
| 4562 | | const expand_text_section = block_placement == null or block_placement.?.next == null; |
| 4563 | | if (expand_text_section) { |
| 4564 | | const needed_size = (vaddr + new_block_size) - text_section.addr; |
| 4565 | | assert(needed_size <= text_segment.inner.filesize); // TODO must move the entire text section. |
| 4566 | | |
| 4567 | | self.last_text_block = text_block; |
| 4568 | | text_section.size = needed_size; |
| 4569 | | self.load_commands_dirty = true; // TODO Make more granular. |
| 4570 | | |
| 4571 | | if (self.d_sym) |*ds| { |
| 4572 | | const debug_text_seg = &ds.load_commands.items[ds.text_segment_cmd_index.?].Segment; |
| 4573 | | const debug_text_sect = &debug_text_seg.sections.items[ds.text_section_index.?]; |
| 4574 | | debug_text_sect.size = needed_size; |
| 4575 | | ds.load_commands_dirty = true; |
| 4576 | | } |
| 4577 | | } |
| 4578 | | text_block.size = new_block_size; |
| 4579 | | |
| 4580 | | if (text_block.prev) |prev| { |
| 4581 | | prev.next = text_block.next; |
| 4582 | | } |
| 4583 | | if (text_block.next) |next| { |
| 4584 | | next.prev = text_block.prev; |
| 4585 | | } |
| 4586 | | |
| 4587 | | if (block_placement) |big_block| { |
| 4588 | | text_block.prev = big_block; |
| 4589 | | text_block.next = big_block.next; |
| 4590 | | big_block.next = text_block; |
| 4591 | | } else { |
| 4592 | | text_block.prev = null; |
| 4593 | | text_block.next = null; |
| 4594 | | } |
| 4595 | | if (free_list_removal) |i| { |
| 4596 | | _ = self.text_block_free_list.swapRemove(i); |
| 4597 | | } |
| 4598 | | |
| 4599 | | return vaddr; |
| 4600 | | } |
| 4601 | | |
| 4602 | | pub fn addExternFn(self: *MachO, name: []const u8) !u32 { |
| 4603 | | const sym_name = try std.fmt.allocPrint(self.base.allocator, "_{s}", .{name}); |
| 4604 | | defer self.base.allocator.free(sym_name); |
| 4605 | | |
| 4606 | | if (self.strtab_dir.getKeyAdapted(@as([]const u8, sym_name), StringIndexAdapter{ |
| 4607 | | .bytes = &self.strtab, |
| 4608 | | })) |n_strx| { |
| 4609 | | const resolv = self.symbol_resolver.get(n_strx) orelse unreachable; |
| 4610 | | return resolv.where_index; |
| 4611 | | } |
| 4612 | | |
| 4613 | | log.debug("adding new extern function '{s}' with dylib ordinal 1", .{sym_name}); |
| 4614 | | const import_sym_index = @intCast(u32, self.undefs.items.len); |
| 4615 | | const n_strx = try self.makeString(sym_name); |
| 4616 | | try self.undefs.append(self.base.allocator, .{ |
| 4617 | | .n_strx = n_strx, |
| 4618 | | .n_type = macho.N_UNDF | macho.N_EXT, |
| 4619 | | .n_sect = 0, |
| 4620 | | .n_desc = @intCast(u8, 1) * macho.N_SYMBOL_RESOLVER, |
| 4621 | | .n_value = 0, |
| 4622 | | }); |
| 4623 | | try self.symbol_resolver.putNoClobber(self.base.allocator, n_strx, .{ |
| 4624 | | .where = .undef, |
| 4625 | | .where_index = import_sym_index, |
| 4626 | | }); |
| 4627 | | |
| 4628 | | const stubs_index = @intCast(u32, self.stubs.items.len); |
| 4629 | | try self.stubs.append(self.base.allocator, import_sym_index); |
| 4630 | | try self.stubs_map.putNoClobber(self.base.allocator, import_sym_index, stubs_index); |
| 4631 | | |
| 4632 | | // TODO discuss this. The caller context expects codegen.InnerError{ OutOfMemory, CodegenFail }, |
| 4633 | | // which obviously doesn't include file writing op errors. So instead of trying to write the stub |
| 4634 | | // entry right here and now, queue it up and dispose of when updating decl. |
| 4635 | | try self.pending_updates.append(self.base.allocator, .{ |
| 4636 | | .kind = .stub, |
| 4637 | | .index = stubs_index, |
| 4638 | | }); |
| 4639 | | |
| 4640 | | return import_sym_index; |
| 4641 | | } |
| 4642 | | |
| 4643 | | const NextSegmentAddressAndOffset = struct { |
| 4644 | | address: u64, |
| 4645 | | offset: u64, |
| 4646 | | }; |
| 4647 | | |
| 4648 | | fn nextSegmentAddressAndOffset(self: *MachO) NextSegmentAddressAndOffset { |
| 4649 | | var prev_segment_idx: ?usize = null; // We use optional here for safety. |
| 4650 | | for (self.load_commands.items) |cmd, i| { |
| 4651 | | if (cmd == .Segment) { |
| 4652 | | prev_segment_idx = i; |
| 4653 | | } |
| 4654 | | } |
| 4655 | | const prev_segment = self.load_commands.items[prev_segment_idx.?].Segment; |
| 4656 | | const address = prev_segment.inner.vmaddr + prev_segment.inner.vmsize; |
| 4657 | | const offset = prev_segment.inner.fileoff + prev_segment.inner.filesize; |
| 4658 | | return .{ |
| 4659 | | .address = address, |
| 4660 | | .offset = offset, |
| 4661 | | }; |
| 4662 | | } |
| 4663 | | |
| 4664 | | fn allocatedSizeLinkedit(self: *MachO, start: u64) u64 { |
| 4665 | | assert(start > 0); |
| 4666 | | var min_pos: u64 = std.math.maxInt(u64); |
| 4667 | | |
| 4668 | | // __LINKEDIT is a weird segment where sections get their own load commands so we |
| 4669 | | // special-case it. |
| 4670 | | if (self.dyld_info_cmd_index) |idx| { |
| 4671 | | const dyld_info = self.load_commands.items[idx].DyldInfoOnly; |
| 4672 | | if (dyld_info.rebase_off > start and dyld_info.rebase_off < min_pos) min_pos = dyld_info.rebase_off; |
| 4673 | | if (dyld_info.bind_off > start and dyld_info.bind_off < min_pos) min_pos = dyld_info.bind_off; |
| 4674 | | if (dyld_info.weak_bind_off > start and dyld_info.weak_bind_off < min_pos) min_pos = dyld_info.weak_bind_off; |
| 4675 | | if (dyld_info.lazy_bind_off > start and dyld_info.lazy_bind_off < min_pos) min_pos = dyld_info.lazy_bind_off; |
| 4676 | | if (dyld_info.export_off > start and dyld_info.export_off < min_pos) min_pos = dyld_info.export_off; |
| 4677 | | } |
| 4678 | | |
| 4679 | | if (self.function_starts_cmd_index) |idx| { |
| 4680 | | const fstart = self.load_commands.items[idx].LinkeditData; |
| 4681 | | if (fstart.dataoff > start and fstart.dataoff < min_pos) min_pos = fstart.dataoff; |
| 4682 | | } |
| 4683 | | |
| 4684 | | if (self.data_in_code_cmd_index) |idx| { |
| 4685 | | const dic = self.load_commands.items[idx].LinkeditData; |
| 4686 | | if (dic.dataoff > start and dic.dataoff < min_pos) min_pos = dic.dataoff; |
| 4687 | | } |
| 4688 | | |
| 4689 | | if (self.dysymtab_cmd_index) |idx| { |
| 4690 | | const dysymtab = self.load_commands.items[idx].Dysymtab; |
| 4691 | | if (dysymtab.indirectsymoff > start and dysymtab.indirectsymoff < min_pos) min_pos = dysymtab.indirectsymoff; |
| 4692 | | // TODO Handle more dynamic symbol table sections. |
| 4693 | | } |
| 4694 | | |
| 4695 | | if (self.symtab_cmd_index) |idx| { |
| 4696 | | const symtab = self.load_commands.items[idx].Symtab; |
| 4697 | | if (symtab.symoff > start and symtab.symoff < min_pos) min_pos = symtab.symoff; |
| 4698 | | if (symtab.stroff > start and symtab.stroff < min_pos) min_pos = symtab.stroff; |
| 4699 | | } |
| 4700 | | |
| 4701 | | return min_pos - start; |
| 4702 | | } |
| 4703 | | inline fn checkForCollision(start: u64, end: u64, off: u64, size: u64) ?u64 { |
| 4704 | | const increased_size = padToIdeal(size); |
| 4705 | | const test_end = off + increased_size; |
| 4706 | | if (end > off and start < test_end) { |
| 4707 | | return test_end; |
| 4708 | | } |
| 4709 | | return null; |
| 4710 | | } |
| 4711 | | |
| 4712 | | fn detectAllocCollisionLinkedit(self: *MachO, start: u64, size: u64) ?u64 { |
| 4713 | | const end = start + padToIdeal(size); |
| 4714 | | |
| 4715 | | // __LINKEDIT is a weird segment where sections get their own load commands so we |
| 4716 | | // special-case it. |
| 4717 | | if (self.dyld_info_cmd_index) |idx| outer: { |
| 4718 | | if (self.load_commands.items.len == idx) break :outer; |
| 4719 | | const dyld_info = self.load_commands.items[idx].DyldInfoOnly; |
| 4720 | | if (checkForCollision(start, end, dyld_info.rebase_off, dyld_info.rebase_size)) |pos| { |
| 4721 | | return pos; |
| 4722 | | } |
| 4723 | | // Binding info |
| 4724 | | if (checkForCollision(start, end, dyld_info.bind_off, dyld_info.bind_size)) |pos| { |
| 4725 | | return pos; |
| 4726 | | } |
| 4727 | | // Weak binding info |
| 4728 | | if (checkForCollision(start, end, dyld_info.weak_bind_off, dyld_info.weak_bind_size)) |pos| { |
| 4729 | | return pos; |
| 4730 | | } |
| 4731 | | // Lazy binding info |
| 4732 | | if (checkForCollision(start, end, dyld_info.lazy_bind_off, dyld_info.lazy_bind_size)) |pos| { |
| 4733 | | return pos; |
| 4734 | | } |
| 4735 | | // Export info |
| 4736 | | if (checkForCollision(start, end, dyld_info.export_off, dyld_info.export_size)) |pos| { |
| 4737 | | return pos; |
| 4738 | | } |
| 4739 | | } |
| 4740 | | |
| 4741 | | if (self.function_starts_cmd_index) |idx| outer: { |
| 4742 | | if (self.load_commands.items.len == idx) break :outer; |
| 4743 | | const fstart = self.load_commands.items[idx].LinkeditData; |
| 4744 | | if (checkForCollision(start, end, fstart.dataoff, fstart.datasize)) |pos| { |
| 4745 | | return pos; |
| 4746 | | } |
| 4747 | | } |
| 4748 | | |
| 4749 | | if (self.data_in_code_cmd_index) |idx| outer: { |
| 4750 | | if (self.load_commands.items.len == idx) break :outer; |
| 4751 | | const dic = self.load_commands.items[idx].LinkeditData; |
| 4752 | | if (checkForCollision(start, end, dic.dataoff, dic.datasize)) |pos| { |
| 4753 | | return pos; |
| 4754 | | } |
| 4755 | | } |
| 4756 | | |
| 4757 | | if (self.dysymtab_cmd_index) |idx| outer: { |
| 4758 | | if (self.load_commands.items.len == idx) break :outer; |
| 4759 | | const dysymtab = self.load_commands.items[idx].Dysymtab; |
| 4760 | | // Indirect symbol table |
| 4761 | | const nindirectsize = dysymtab.nindirectsyms * @sizeOf(u32); |
| 4762 | | if (checkForCollision(start, end, dysymtab.indirectsymoff, nindirectsize)) |pos| { |
| 4763 | | return pos; |
| 4764 | | } |
| 4765 | | // TODO Handle more dynamic symbol table sections. |
| 4766 | | } |
| 4767 | | |
| 4768 | | if (self.symtab_cmd_index) |idx| outer: { |
| 4769 | | if (self.load_commands.items.len == idx) break :outer; |
| 4770 | | const symtab = self.load_commands.items[idx].Symtab; |
| 4771 | | // Symbol table |
| 4772 | | const symsize = symtab.nsyms * @sizeOf(macho.nlist_64); |
| 4773 | | if (checkForCollision(start, end, symtab.symoff, symsize)) |pos| { |
| 4774 | | return pos; |
| 4775 | | } |
| 4776 | | // String table |
| 4777 | | if (checkForCollision(start, end, symtab.stroff, symtab.strsize)) |pos| { |
| 4778 | | return pos; |
| 4779 | | } |
| 4780 | | } |
| 4781 | | |
| 4782 | | return null; |
| 4783 | | } |
| 4784 | | |
| 4785 | | fn findFreeSpaceLinkedit(self: *MachO, object_size: u64, min_alignment: u16, start: ?u64) u64 { |
| 4786 | | const linkedit = self.load_commands.items[self.linkedit_segment_cmd_index.?].Segment; |
| 4787 | | var st: u64 = start orelse linkedit.inner.fileoff; |
| 4788 | | while (self.detectAllocCollisionLinkedit(st, object_size)) |item_end| { |
| 4789 | | st = mem.alignForwardGeneric(u64, item_end, min_alignment); |
| 4790 | | } |
| 4791 | | return st; |
| 4792 | | } |
| 4793 | | |
| 4794 | | fn writeGotEntry(self: *MachO, index: usize) !void { |
| 4795 | | const seg = &self.load_commands.items[self.data_const_segment_cmd_index.?].Segment; |
| 4796 | | const sect = &seg.sections.items[self.got_section_index.?]; |
| 4797 | | const off = sect.offset + @sizeOf(u64) * index; |
| 4798 | | |
| 4799 | | if (self.got_entries_count_dirty) { |
| 4800 | | // TODO relocate. |
| 4801 | | self.got_entries_count_dirty = false; |
| 4802 | | } |
| 4803 | | |
| 4804 | | const got_entry = self.got_entries.items[index]; |
| 4805 | | const sym = switch (got_entry.where) { |
| 4806 | | .local => self.locals.items[got_entry.where_index], |
| 4807 | | .undef => self.undefs.items[got_entry.where_index], |
| 4808 | | }; |
| 4809 | | log.debug("writing offset table entry [ 0x{x} => 0x{x} ({s}) ]", .{ |
| 4810 | | off, |
| 4811 | | sym.n_value, |
| 4812 | | self.getString(sym.n_strx), |
| 4813 | | }); |
| 4814 | | try self.base.file.?.pwriteAll(mem.asBytes(&sym.n_value), off); |
| 4815 | | } |
| 4816 | | |
| 4817 | | fn writeLazySymbolPointer(self: *MachO, index: u32) !void { |
| 4818 | | const text_segment = self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 4819 | | const stub_helper = text_segment.sections.items[self.stub_helper_section_index.?]; |
| 4820 | | const data_segment = self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 4821 | | const la_symbol_ptr = data_segment.sections.items[self.la_symbol_ptr_section_index.?]; |
| 4822 | | |
| 4823 | | const stub_size: u4 = switch (self.base.options.target.cpu.arch) { |
| 4824 | | .x86_64 => 10, |
| 4825 | | .aarch64 => 3 * @sizeOf(u32), |
| 4826 | | else => unreachable, |
| 4827 | | }; |
| 4828 | | const stub_off = self.stub_helper_stubs_start_off.? + index * stub_size; |
| 4829 | | const end = stub_helper.addr + stub_off - stub_helper.offset; |
| 4830 | | var buf: [@sizeOf(u64)]u8 = undefined; |
| 4831 | | mem.writeIntLittle(u64, &buf, end); |
| 4832 | | const off = la_symbol_ptr.offset + index * @sizeOf(u64); |
| 4833 | | log.debug("writing lazy symbol pointer entry 0x{x} at 0x{x}", .{ end, off }); |
| 4834 | | try self.base.file.?.pwriteAll(&buf, off); |
| 4835 | | } |
| 4836 | | |
| 4837 | | fn writeStubHelperPreamble(self: *MachO) !void { |
| 4838 | | const text_segment = &self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 4839 | | const stub_helper = &text_segment.sections.items[self.stub_helper_section_index.?]; |
| 4840 | | const data_const_segment = &self.load_commands.items[self.data_const_segment_cmd_index.?].Segment; |
| 4841 | | const got = &data_const_segment.sections.items[self.got_section_index.?]; |
| 4842 | | const data_segment = &self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 4843 | | const data = &data_segment.sections.items[self.data_section_index.?]; |
| 4844 | | |
| 4845 | | switch (self.base.options.target.cpu.arch) { |
| 4846 | | .x86_64 => { |
| 4847 | | const code_size = 15; |
| 4848 | | var code: [code_size]u8 = undefined; |
| 4849 | | // lea %r11, [rip + disp] |
| 4850 | | code[0] = 0x4c; |
| 4851 | | code[1] = 0x8d; |
| 4852 | | code[2] = 0x1d; |
| 4853 | | { |
| 4854 | | const target_addr = data.addr; |
| 4855 | | const displacement = try math.cast(u32, target_addr - stub_helper.addr - 7); |
| 4856 | | mem.writeIntLittle(u32, code[3..7], displacement); |
| 4857 | | } |
| 4858 | | // push %r11 |
| 4859 | | code[7] = 0x41; |
| 4860 | | code[8] = 0x53; |
| 4861 | | // jmp [rip + disp] |
| 4862 | | code[9] = 0xff; |
| 4863 | | code[10] = 0x25; |
| 4864 | | { |
| 4865 | | const displacement = try math.cast(u32, got.addr - stub_helper.addr - code_size); |
| 4866 | | mem.writeIntLittle(u32, code[11..], displacement); |
| 4867 | | } |
| 4868 | | try self.base.file.?.pwriteAll(&code, stub_helper.offset); |
| 4869 | | self.stub_helper_stubs_start_off = stub_helper.offset + code_size; |
| 4870 | | }, |
| 4871 | | .aarch64 => { |
| 4872 | | var code: [6 * @sizeOf(u32)]u8 = undefined; |
| 4873 | | |
| 4874 | | data_blk_outer: { |
| 4875 | | const this_addr = stub_helper.addr; |
| 4876 | | const target_addr = data.addr; |
| 4877 | | data_blk: { |
| 4878 | | const displacement = math.cast(i21, target_addr - this_addr) catch break :data_blk; |
| 4879 | | // adr x17, disp |
| 4880 | | mem.writeIntLittle(u32, code[0..4], aarch64.Instruction.adr(.x17, displacement).toU32()); |
| 4881 | | // nop |
| 4882 | | mem.writeIntLittle(u32, code[4..8], aarch64.Instruction.nop().toU32()); |
| 4883 | | break :data_blk_outer; |
| 4884 | | } |
| 4885 | | data_blk: { |
| 4886 | | const new_this_addr = this_addr + @sizeOf(u32); |
| 4887 | | const displacement = math.cast(i21, target_addr - new_this_addr) catch break :data_blk; |
| 4888 | | // nop |
| 4889 | | mem.writeIntLittle(u32, code[0..4], aarch64.Instruction.nop().toU32()); |
| 4890 | | // adr x17, disp |
| 4891 | | mem.writeIntLittle(u32, code[4..8], aarch64.Instruction.adr(.x17, displacement).toU32()); |
| 4892 | | break :data_blk_outer; |
| 4893 | | } |
| 4894 | | // Jump is too big, replace adr with adrp and add. |
| 4895 | | const this_page = @intCast(i32, this_addr >> 12); |
| 4896 | | const target_page = @intCast(i32, target_addr >> 12); |
| 4897 | | const pages = @intCast(i21, target_page - this_page); |
| 4898 | | // adrp x17, pages |
| 4899 | | mem.writeIntLittle(u32, code[0..4], aarch64.Instruction.adrp(.x17, pages).toU32()); |
| 4900 | | const narrowed = @truncate(u12, target_addr); |
| 4901 | | mem.writeIntLittle(u32, code[4..8], aarch64.Instruction.add(.x17, .x17, narrowed, false).toU32()); |
| 4902 | | } |
| 4903 | | |
| 4904 | | // stp x16, x17, [sp, #-16]! |
| 4905 | | mem.writeIntLittle(u32, code[8..12], aarch64.Instruction.stp( |
| 4906 | | .x16, |
| 4907 | | .x17, |
| 4908 | | aarch64.Register.sp, |
| 4909 | | aarch64.Instruction.LoadStorePairOffset.pre_index(-16), |
| 4910 | | ).toU32()); |
| 4911 | | |
| 4912 | | binder_blk_outer: { |
| 4913 | | const this_addr = stub_helper.addr + 3 * @sizeOf(u32); |
| 4914 | | const target_addr = got.addr; |
| 4915 | | binder_blk: { |
| 4916 | | const displacement = math.divExact(u64, target_addr - this_addr, 4) catch break :binder_blk; |
| 4917 | | const literal = math.cast(u18, displacement) catch break :binder_blk; |
| 4918 | | // ldr x16, label |
| 4919 | | mem.writeIntLittle(u32, code[12..16], aarch64.Instruction.ldr(.x16, .{ |
| 4920 | | .literal = literal, |
| 4921 | | }).toU32()); |
| 4922 | | // nop |
| 4923 | | mem.writeIntLittle(u32, code[16..20], aarch64.Instruction.nop().toU32()); |
| 4924 | | break :binder_blk_outer; |
| 4925 | | } |
| 4926 | | binder_blk: { |
| 4927 | | const new_this_addr = this_addr + @sizeOf(u32); |
| 4928 | | const displacement = math.divExact(u64, target_addr - new_this_addr, 4) catch break :binder_blk; |
| 4929 | | const literal = math.cast(u18, displacement) catch break :binder_blk; |
| 4930 | | // nop |
| 4931 | | mem.writeIntLittle(u32, code[12..16], aarch64.Instruction.nop().toU32()); |
| 4932 | | // ldr x16, label |
| 4933 | | mem.writeIntLittle(u32, code[16..20], aarch64.Instruction.ldr(.x16, .{ |
| 4934 | | .literal = literal, |
| 4935 | | }).toU32()); |
| 4936 | | break :binder_blk_outer; |
| 4937 | | } |
| 4938 | | // Jump is too big, replace ldr with adrp and ldr(register). |
| 4939 | | const this_page = @intCast(i32, this_addr >> 12); |
| 4940 | | const target_page = @intCast(i32, target_addr >> 12); |
| 4941 | | const pages = @intCast(i21, target_page - this_page); |
| 4942 | | // adrp x16, pages |
| 4943 | | mem.writeIntLittle(u32, code[12..16], aarch64.Instruction.adrp(.x16, pages).toU32()); |
| 4944 | | const narrowed = @truncate(u12, target_addr); |
| 4945 | | const offset = try math.divExact(u12, narrowed, 8); |
| 4946 | | // ldr x16, x16, offset |
| 4947 | | mem.writeIntLittle(u32, code[16..20], aarch64.Instruction.ldr(.x16, .{ |
| 4948 | | .register = .{ |
| 4949 | | .rn = .x16, |
| 4950 | | .offset = aarch64.Instruction.LoadStoreOffset.imm(offset), |
| 4951 | | }, |
| 4952 | | }).toU32()); |
| 4953 | | } |
| 4954 | | |
| 4955 | | // br x16 |
| 4956 | | mem.writeIntLittle(u32, code[20..24], aarch64.Instruction.br(.x16).toU32()); |
| 4957 | | try self.base.file.?.pwriteAll(&code, stub_helper.offset); |
| 4958 | | self.stub_helper_stubs_start_off = stub_helper.offset + code.len; |
| 4959 | | }, |
| 4960 | | else => unreachable, |
| 4961 | | } |
| 4962 | | } |
| 4963 | | |
| 4964 | | fn writeStub(self: *MachO, index: u32) !void { |
| 4965 | | const text_segment = self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 4966 | | const stubs = text_segment.sections.items[self.stubs_section_index.?]; |
| 4967 | | const data_segment = self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 4968 | | const la_symbol_ptr = data_segment.sections.items[self.la_symbol_ptr_section_index.?]; |
| 4969 | | |
| 4970 | | const stub_off = stubs.offset + index * stubs.reserved2; |
| 4971 | | const stub_addr = stubs.addr + index * stubs.reserved2; |
| 4972 | | const la_ptr_addr = la_symbol_ptr.addr + index * @sizeOf(u64); |
| 4973 | | |
| 4974 | | log.debug("writing stub at 0x{x}", .{stub_off}); |
| 4975 | | |
| 4976 | | var code = try self.base.allocator.alloc(u8, stubs.reserved2); |
| 4977 | | defer self.base.allocator.free(code); |
| 4978 | | |
| 4979 | | switch (self.base.options.target.cpu.arch) { |
| 4980 | | .x86_64 => { |
| 4981 | | assert(la_ptr_addr >= stub_addr + stubs.reserved2); |
| 4982 | | const displacement = try math.cast(u32, la_ptr_addr - stub_addr - stubs.reserved2); |
| 4983 | | // jmp |
| 4984 | | code[0] = 0xff; |
| 4985 | | code[1] = 0x25; |
| 4986 | | mem.writeIntLittle(u32, code[2..][0..4], displacement); |
| 4987 | | }, |
| 4988 | | .aarch64 => { |
| 4989 | | assert(la_ptr_addr >= stub_addr); |
| 4990 | | outer: { |
| 4991 | | const this_addr = stub_addr; |
| 4992 | | const target_addr = la_ptr_addr; |
| 4993 | | inner: { |
| 4994 | | const displacement = math.divExact(u64, target_addr - this_addr, 4) catch break :inner; |
| 4995 | | const literal = math.cast(u18, displacement) catch break :inner; |
| 4996 | | // ldr x16, literal |
| 4997 | | mem.writeIntLittle(u32, code[0..4], aarch64.Instruction.ldr(.x16, .{ |
| 4998 | | .literal = literal, |
| 4999 | | }).toU32()); |
| 5000 | | // nop |
| 5001 | | mem.writeIntLittle(u32, code[4..8], aarch64.Instruction.nop().toU32()); |
| 5002 | | break :outer; |
| 5003 | | } |
| 5004 | | inner: { |
| 5005 | | const new_this_addr = this_addr + @sizeOf(u32); |
| 5006 | | const displacement = math.divExact(u64, target_addr - new_this_addr, 4) catch break :inner; |
| 5007 | | const literal = math.cast(u18, displacement) catch break :inner; |
| 5008 | | // nop |
| 5009 | | mem.writeIntLittle(u32, code[0..4], aarch64.Instruction.nop().toU32()); |
| 5010 | | // ldr x16, literal |
| 5011 | | mem.writeIntLittle(u32, code[4..8], aarch64.Instruction.ldr(.x16, .{ |
| 5012 | | .literal = literal, |
| 5013 | | }).toU32()); |
| 5014 | | break :outer; |
| 5015 | | } |
| 5016 | | // Use adrp followed by ldr(register). |
| 5017 | | const this_page = @intCast(i32, this_addr >> 12); |
| 5018 | | const target_page = @intCast(i32, target_addr >> 12); |
| 5019 | | const pages = @intCast(i21, target_page - this_page); |
| 5020 | | // adrp x16, pages |
| 5021 | | mem.writeIntLittle(u32, code[0..4], aarch64.Instruction.adrp(.x16, pages).toU32()); |
| 5022 | | const narrowed = @truncate(u12, target_addr); |
| 5023 | | const offset = try math.divExact(u12, narrowed, 8); |
| 5024 | | // ldr x16, x16, offset |
| 5025 | | mem.writeIntLittle(u32, code[4..8], aarch64.Instruction.ldr(.x16, .{ |
| 5026 | | .register = .{ |
| 5027 | | .rn = .x16, |
| 5028 | | .offset = aarch64.Instruction.LoadStoreOffset.imm(offset), |
| 5029 | | }, |
| 5030 | | }).toU32()); |
| 5031 | | } |
| 5032 | | // br x16 |
| 5033 | | mem.writeIntLittle(u32, code[8..12], aarch64.Instruction.br(.x16).toU32()); |
| 5034 | | }, |
| 5035 | | else => unreachable, |
| 3736 | if (self.symtab_cmd_index == null) { |
| 3737 | self.symtab_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 3738 | try self.load_commands.append(self.base.allocator, .{ |
| 3739 | .Symtab = .{ |
| 3740 | .cmd = macho.LC_SYMTAB, |
| 3741 | .cmdsize = @sizeOf(macho.symtab_command), |
| 3742 | .symoff = 0, |
| 3743 | .nsyms = 0, |
| 3744 | .stroff = 0, |
| 3745 | .strsize = 0, |
| 3746 | }, |
| 3747 | }); |
| 3748 | self.load_commands_dirty = true; |
| 5036 | 3749 | } |
| 5037 | | try self.base.file.?.pwriteAll(code, stub_off); |
| 5038 | | } |
| 5039 | | |
| 5040 | | fn writeStubInStubHelper(self: *MachO, index: u32) !void { |
| 5041 | | const text_segment = self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 5042 | | const stub_helper = text_segment.sections.items[self.stub_helper_section_index.?]; |
| 5043 | | |
| 5044 | | const stub_size: u4 = switch (self.base.options.target.cpu.arch) { |
| 5045 | | .x86_64 => 10, |
| 5046 | | .aarch64 => 3 * @sizeOf(u32), |
| 5047 | | else => unreachable, |
| 5048 | | }; |
| 5049 | | const stub_off = self.stub_helper_stubs_start_off.? + index * stub_size; |
| 5050 | | |
| 5051 | | var code = try self.base.allocator.alloc(u8, stub_size); |
| 5052 | | defer self.base.allocator.free(code); |
| 5053 | 3750 | |
| 5054 | | switch (self.base.options.target.cpu.arch) { |
| 5055 | | .x86_64 => { |
| 5056 | | const displacement = try math.cast( |
| 5057 | | i32, |
| 5058 | | @intCast(i64, stub_helper.offset) - @intCast(i64, stub_off) - stub_size, |
| 5059 | | ); |
| 5060 | | // pushq |
| 5061 | | code[0] = 0x68; |
| 5062 | | mem.writeIntLittle(u32, code[1..][0..4], 0x0); // Just a placeholder populated in `populateLazyBindOffsetsInStubHelper`. |
| 5063 | | // jmpq |
| 5064 | | code[5] = 0xe9; |
| 5065 | | mem.writeIntLittle(u32, code[6..][0..4], @bitCast(u32, displacement)); |
| 5066 | | }, |
| 5067 | | .aarch64 => { |
| 5068 | | const literal = blk: { |
| 5069 | | const div_res = try math.divExact(u64, stub_size - @sizeOf(u32), 4); |
| 5070 | | break :blk try math.cast(u18, div_res); |
| 5071 | | }; |
| 5072 | | // ldr w16, literal |
| 5073 | | mem.writeIntLittle(u32, code[0..4], aarch64.Instruction.ldr(.w16, .{ |
| 5074 | | .literal = literal, |
| 5075 | | }).toU32()); |
| 5076 | | const displacement = try math.cast(i28, @intCast(i64, stub_helper.offset) - @intCast(i64, stub_off) - 4); |
| 5077 | | // b disp |
| 5078 | | mem.writeIntLittle(u32, code[4..8], aarch64.Instruction.b(displacement).toU32()); |
| 5079 | | // Just a placeholder populated in `populateLazyBindOffsetsInStubHelper`. |
| 5080 | | mem.writeIntLittle(u32, code[8..12], 0x0); |
| 5081 | | }, |
| 5082 | | else => unreachable, |
| 3751 | if (self.dysymtab_cmd_index == null) { |
| 3752 | self.dysymtab_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 3753 | try self.load_commands.append(self.base.allocator, .{ |
| 3754 | .Dysymtab = .{ |
| 3755 | .cmd = macho.LC_DYSYMTAB, |
| 3756 | .cmdsize = @sizeOf(macho.dysymtab_command), |
| 3757 | .ilocalsym = 0, |
| 3758 | .nlocalsym = 0, |
| 3759 | .iextdefsym = 0, |
| 3760 | .nextdefsym = 0, |
| 3761 | .iundefsym = 0, |
| 3762 | .nundefsym = 0, |
| 3763 | .tocoff = 0, |
| 3764 | .ntoc = 0, |
| 3765 | .modtaboff = 0, |
| 3766 | .nmodtab = 0, |
| 3767 | .extrefsymoff = 0, |
| 3768 | .nextrefsyms = 0, |
| 3769 | .indirectsymoff = 0, |
| 3770 | .nindirectsyms = 0, |
| 3771 | .extreloff = 0, |
| 3772 | .nextrel = 0, |
| 3773 | .locreloff = 0, |
| 3774 | .nlocrel = 0, |
| 3775 | }, |
| 3776 | }); |
| 3777 | self.load_commands_dirty = true; |
| 5083 | 3778 | } |
| 5084 | | try self.base.file.?.pwriteAll(code, stub_off); |
| 5085 | | } |
| 5086 | | |
| 5087 | | fn relocateSymbolTable(self: *MachO) !void { |
| 5088 | | const symtab = &self.load_commands.items[self.symtab_cmd_index.?].Symtab; |
| 5089 | | const nlocals = self.locals.items.len; |
| 5090 | | const nglobals = self.globals.items.len; |
| 5091 | | const nundefs = self.undefs.items.len; |
| 5092 | | const nsyms = nlocals + nglobals + nundefs; |
| 5093 | | |
| 5094 | | if (symtab.nsyms < nsyms) { |
| 5095 | | const needed_size = nsyms * @sizeOf(macho.nlist_64); |
| 5096 | | if (needed_size > self.allocatedSizeLinkedit(symtab.symoff)) { |
| 5097 | | // Move the entire symbol table to a new location |
| 5098 | | const new_symoff = self.findFreeSpaceLinkedit(needed_size, @alignOf(macho.nlist_64), null); |
| 5099 | | const existing_size = symtab.nsyms * @sizeOf(macho.nlist_64); |
| 5100 | | |
| 5101 | | log.debug("relocating symbol table from 0x{x}-0x{x} to 0x{x}-0x{x}", .{ |
| 5102 | | symtab.symoff, |
| 5103 | | symtab.symoff + existing_size, |
| 5104 | | new_symoff, |
| 5105 | | new_symoff + existing_size, |
| 5106 | | }); |
| 5107 | 3779 | |
| 5108 | | const amt = try self.base.file.?.copyRangeAll(symtab.symoff, self.base.file.?, new_symoff, existing_size); |
| 5109 | | if (amt != existing_size) return error.InputOutput; |
| 5110 | | symtab.symoff = @intCast(u32, new_symoff); |
| 5111 | | self.strtab_needs_relocation = true; |
| 5112 | | } |
| 5113 | | symtab.nsyms = @intCast(u32, nsyms); |
| 3780 | if (self.dylinker_cmd_index == null) { |
| 3781 | self.dylinker_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 3782 | const cmdsize = @intCast(u32, mem.alignForwardGeneric( |
| 3783 | u64, |
| 3784 | @sizeOf(macho.dylinker_command) + mem.lenZ(default_dyld_path), |
| 3785 | @sizeOf(u64), |
| 3786 | )); |
| 3787 | var dylinker_cmd = commands.emptyGenericCommandWithData(macho.dylinker_command{ |
| 3788 | .cmd = macho.LC_LOAD_DYLINKER, |
| 3789 | .cmdsize = cmdsize, |
| 3790 | .name = @sizeOf(macho.dylinker_command), |
| 3791 | }); |
| 3792 | dylinker_cmd.data = try self.base.allocator.alloc(u8, cmdsize - dylinker_cmd.inner.name); |
| 3793 | mem.set(u8, dylinker_cmd.data, 0); |
| 3794 | mem.copy(u8, dylinker_cmd.data, mem.spanZ(default_dyld_path)); |
| 3795 | try self.load_commands.append(self.base.allocator, .{ .Dylinker = dylinker_cmd }); |
| 5114 | 3796 | self.load_commands_dirty = true; |
| 5115 | 3797 | } |
| 5116 | | } |
| 5117 | | |
| 5118 | | fn writeLocalSymbol(self: *MachO, index: usize) !void { |
| 5119 | | const tracy = trace(@src()); |
| 5120 | | defer tracy.end(); |
| 5121 | | try self.relocateSymbolTable(); |
| 5122 | | const symtab = &self.load_commands.items[self.symtab_cmd_index.?].Symtab; |
| 5123 | | const off = symtab.symoff + @sizeOf(macho.nlist_64) * index; |
| 5124 | | log.debug("writing local symbol {} at 0x{x}", .{ index, off }); |
| 5125 | | try self.base.file.?.pwriteAll(mem.asBytes(&self.locals.items[index]), off); |
| 5126 | | } |
| 5127 | | |
| 5128 | | fn writeAllGlobalAndUndefSymbols(self: *MachO) !void { |
| 5129 | | const tracy = trace(@src()); |
| 5130 | | defer tracy.end(); |
| 5131 | 3798 | |
| 5132 | | try self.relocateSymbolTable(); |
| 5133 | | const symtab = &self.load_commands.items[self.symtab_cmd_index.?].Symtab; |
| 5134 | | const nlocals = self.locals.items.len; |
| 5135 | | const nglobals = self.globals.items.len; |
| 5136 | | const nundefs = self.undefs.items.len; |
| 5137 | | |
| 5138 | | const locals_off = symtab.symoff; |
| 5139 | | const locals_size = nlocals * @sizeOf(macho.nlist_64); |
| 5140 | | |
| 5141 | | const globals_off = locals_off + locals_size; |
| 5142 | | const globals_size = nglobals * @sizeOf(macho.nlist_64); |
| 5143 | | log.debug("writing global symbols from 0x{x} to 0x{x}", .{ globals_off, globals_size + globals_off }); |
| 5144 | | try self.base.file.?.pwriteAll(mem.sliceAsBytes(self.globals.items), globals_off); |
| 5145 | | |
| 5146 | | const undefs_off = globals_off + globals_size; |
| 5147 | | const undefs_size = nundefs * @sizeOf(macho.nlist_64); |
| 5148 | | log.debug("writing extern symbols from 0x{x} to 0x{x}", .{ undefs_off, undefs_size + undefs_off }); |
| 5149 | | try self.base.file.?.pwriteAll(mem.sliceAsBytes(self.undefs.items), undefs_off); |
| 5150 | | |
| 5151 | | // Update dynamic symbol table. |
| 5152 | | const dysymtab = &self.load_commands.items[self.dysymtab_cmd_index.?].Dysymtab; |
| 5153 | | dysymtab.nlocalsym = @intCast(u32, nlocals); |
| 5154 | | dysymtab.iextdefsym = @intCast(u32, nlocals); |
| 5155 | | dysymtab.nextdefsym = @intCast(u32, nglobals); |
| 5156 | | dysymtab.iundefsym = @intCast(u32, nlocals + nglobals); |
| 5157 | | dysymtab.nundefsym = @intCast(u32, nundefs); |
| 5158 | | self.load_commands_dirty = true; |
| 5159 | | } |
| 5160 | | |
| 5161 | | fn writeIndirectSymbolTable(self: *MachO) !void { |
| 5162 | | // TODO figure out a way not to rewrite the table every time if |
| 5163 | | // no new undefs are not added. |
| 5164 | | const tracy = trace(@src()); |
| 5165 | | defer tracy.end(); |
| 5166 | | |
| 5167 | | const text_segment = &self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 5168 | | const stubs = &text_segment.sections.items[self.stubs_section_index.?]; |
| 5169 | | const data_const_seg = &self.load_commands.items[self.data_const_segment_cmd_index.?].Segment; |
| 5170 | | const got = &data_const_seg.sections.items[self.got_section_index.?]; |
| 5171 | | const data_segment = &self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 5172 | | const la_symbol_ptr = &data_segment.sections.items[self.la_symbol_ptr_section_index.?]; |
| 5173 | | const dysymtab = &self.load_commands.items[self.dysymtab_cmd_index.?].Dysymtab; |
| 5174 | | |
| 5175 | | const nstubs = @intCast(u32, self.stubs.items.len); |
| 5176 | | const ngot_entries = @intCast(u32, self.got_entries.items.len); |
| 5177 | | const allocated_size = self.allocatedSizeLinkedit(dysymtab.indirectsymoff); |
| 5178 | | const nindirectsyms = nstubs * 2 + ngot_entries; |
| 5179 | | const needed_size = @intCast(u32, nindirectsyms * @sizeOf(u32)); |
| 5180 | | |
| 5181 | | if (needed_size > allocated_size) { |
| 5182 | | dysymtab.nindirectsyms = 0; |
| 5183 | | dysymtab.indirectsymoff = @intCast(u32, self.findFreeSpaceLinkedit(needed_size, @sizeOf(u32), null)); |
| 3799 | if (self.main_cmd_index == null and self.base.options.output_mode == .Exe) { |
| 3800 | self.main_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 3801 | try self.load_commands.append(self.base.allocator, .{ |
| 3802 | .Main = .{ |
| 3803 | .cmd = macho.LC_MAIN, |
| 3804 | .cmdsize = @sizeOf(macho.entry_point_command), |
| 3805 | .entryoff = 0x0, |
| 3806 | .stacksize = 0, |
| 3807 | }, |
| 3808 | }); |
| 3809 | self.load_commands_dirty = true; |
| 5184 | 3810 | } |
| 5185 | | dysymtab.nindirectsyms = nindirectsyms; |
| 5186 | | log.debug("writing indirect symbol table from 0x{x} to 0x{x}", .{ |
| 5187 | | dysymtab.indirectsymoff, |
| 5188 | | dysymtab.indirectsymoff + needed_size, |
| 5189 | | }); |
| 5190 | | |
| 5191 | | var buf = try self.base.allocator.alloc(u8, needed_size); |
| 5192 | | defer self.base.allocator.free(buf); |
| 5193 | | var stream = std.io.fixedBufferStream(buf); |
| 5194 | | var writer = stream.writer(); |
| 5195 | 3811 | |
| 5196 | | stubs.reserved1 = 0; |
| 5197 | | for (self.stubs.items) |id| { |
| 5198 | | try writer.writeIntLittle(u32, dysymtab.iundefsym + id); |
| 3812 | if (self.dylib_id_cmd_index == null and self.base.options.output_mode == .Lib) { |
| 3813 | self.dylib_id_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 3814 | const install_name = try std.fmt.allocPrint(self.base.allocator, "@rpath/{s}", .{ |
| 3815 | self.base.options.emit.?.sub_path, |
| 3816 | }); |
| 3817 | defer self.base.allocator.free(install_name); |
| 3818 | var dylib_cmd = try commands.createLoadDylibCommand( |
| 3819 | self.base.allocator, |
| 3820 | install_name, |
| 3821 | 2, |
| 3822 | 0x10000, // TODO forward user-provided versions |
| 3823 | 0x10000, |
| 3824 | ); |
| 3825 | errdefer dylib_cmd.deinit(self.base.allocator); |
| 3826 | dylib_cmd.inner.cmd = macho.LC_ID_DYLIB; |
| 3827 | try self.load_commands.append(self.base.allocator, .{ .Dylib = dylib_cmd }); |
| 3828 | self.load_commands_dirty = true; |
| 5199 | 3829 | } |
| 5200 | 3830 | |
| 5201 | | got.reserved1 = nstubs; |
| 5202 | | for (self.got_entries.items) |entry| { |
| 5203 | | switch (entry.where) { |
| 5204 | | .undef => { |
| 5205 | | try writer.writeIntLittle(u32, dysymtab.iundefsym + entry.where_index); |
| 5206 | | }, |
| 5207 | | .local => { |
| 5208 | | try writer.writeIntLittle(u32, macho.INDIRECT_SYMBOL_LOCAL); |
| 3831 | if (self.source_version_cmd_index == null) { |
| 3832 | self.source_version_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 3833 | try self.load_commands.append(self.base.allocator, .{ |
| 3834 | .SourceVersion = .{ |
| 3835 | .cmd = macho.LC_SOURCE_VERSION, |
| 3836 | .cmdsize = @sizeOf(macho.source_version_command), |
| 3837 | .version = 0x0, |
| 5209 | 3838 | }, |
| 5210 | | } |
| 3839 | }); |
| 3840 | self.load_commands_dirty = true; |
| 5211 | 3841 | } |
| 5212 | 3842 | |
| 5213 | | la_symbol_ptr.reserved1 = got.reserved1 + ngot_entries; |
| 5214 | | for (self.stubs.items) |id| { |
| 5215 | | try writer.writeIntLittle(u32, dysymtab.iundefsym + id); |
| 3843 | if (self.build_version_cmd_index == null) { |
| 3844 | self.build_version_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 3845 | const cmdsize = @intCast(u32, mem.alignForwardGeneric( |
| 3846 | u64, |
| 3847 | @sizeOf(macho.build_version_command) + @sizeOf(macho.build_tool_version), |
| 3848 | @sizeOf(u64), |
| 3849 | )); |
| 3850 | const ver = self.base.options.target.os.version_range.semver.min; |
| 3851 | const version = ver.major << 16 | ver.minor << 8 | ver.patch; |
| 3852 | const is_simulator_abi = self.base.options.target.abi == .simulator; |
| 3853 | var cmd = commands.emptyGenericCommandWithData(macho.build_version_command{ |
| 3854 | .cmd = macho.LC_BUILD_VERSION, |
| 3855 | .cmdsize = cmdsize, |
| 3856 | .platform = switch (self.base.options.target.os.tag) { |
| 3857 | .macos => macho.PLATFORM_MACOS, |
| 3858 | .ios => if (is_simulator_abi) macho.PLATFORM_IOSSIMULATOR else macho.PLATFORM_IOS, |
| 3859 | .watchos => if (is_simulator_abi) macho.PLATFORM_WATCHOSSIMULATOR else macho.PLATFORM_WATCHOS, |
| 3860 | .tvos => if (is_simulator_abi) macho.PLATFORM_TVOSSIMULATOR else macho.PLATFORM_TVOS, |
| 3861 | else => unreachable, |
| 3862 | }, |
| 3863 | .minos = version, |
| 3864 | .sdk = version, |
| 3865 | .ntools = 1, |
| 3866 | }); |
| 3867 | const ld_ver = macho.build_tool_version{ |
| 3868 | .tool = macho.TOOL_LD, |
| 3869 | .version = 0x0, |
| 3870 | }; |
| 3871 | cmd.data = try self.base.allocator.alloc(u8, cmdsize - @sizeOf(macho.build_version_command)); |
| 3872 | mem.set(u8, cmd.data, 0); |
| 3873 | mem.copy(u8, cmd.data, mem.asBytes(&ld_ver)); |
| 3874 | try self.load_commands.append(self.base.allocator, .{ .BuildVersion = cmd }); |
| 3875 | self.load_commands_dirty = true; |
| 5216 | 3876 | } |
| 5217 | 3877 | |
| 5218 | | try self.base.file.?.pwriteAll(buf, dysymtab.indirectsymoff); |
| 5219 | | self.load_commands_dirty = true; |
| 5220 | | } |
| 5221 | | |
| 5222 | | fn writeDices(self: *MachO) !void { |
| 5223 | | if (!self.has_dices) return; |
| 5224 | | |
| 5225 | | const seg = &self.load_commands.items[self.linkedit_segment_cmd_index.?].Segment; |
| 5226 | | const dice_cmd = &self.load_commands.items[self.data_in_code_cmd_index.?].LinkeditData; |
| 5227 | | const fileoff = seg.inner.fileoff + seg.inner.filesize; |
| 5228 | | |
| 5229 | | var buf = std.ArrayList(u8).init(self.base.allocator); |
| 5230 | | defer buf.deinit(); |
| 5231 | | |
| 5232 | | var block: *TextBlock = self.blocks.get(.{ |
| 5233 | | .seg = self.text_segment_cmd_index orelse return, |
| 5234 | | .sect = self.text_section_index orelse return, |
| 5235 | | }) orelse return; |
| 5236 | | |
| 5237 | | while (block.prev) |prev| { |
| 5238 | | block = prev; |
| 3878 | if (self.uuid_cmd_index == null) { |
| 3879 | self.uuid_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 3880 | var uuid_cmd: macho.uuid_command = .{ |
| 3881 | .cmd = macho.LC_UUID, |
| 3882 | .cmdsize = @sizeOf(macho.uuid_command), |
| 3883 | .uuid = undefined, |
| 3884 | }; |
| 3885 | std.crypto.random.bytes(&uuid_cmd.uuid); |
| 3886 | try self.load_commands.append(self.base.allocator, .{ .Uuid = uuid_cmd }); |
| 3887 | self.load_commands_dirty = true; |
| 5239 | 3888 | } |
| 5240 | 3889 | |
| 5241 | | const text_seg = self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 5242 | | const text_sect = text_seg.sections.items[self.text_section_index.?]; |
| 5243 | | |
| 5244 | | while (true) { |
| 5245 | | if (block.dices.items.len > 0) { |
| 5246 | | const sym = self.locals.items[block.local_sym_index]; |
| 5247 | | const base_off = try math.cast(u32, sym.n_value - text_sect.addr + text_sect.offset); |
| 5248 | | |
| 5249 | | try buf.ensureUnusedCapacity(block.dices.items.len * @sizeOf(macho.data_in_code_entry)); |
| 5250 | | for (block.dices.items) |dice| { |
| 5251 | | const rebased_dice = macho.data_in_code_entry{ |
| 5252 | | .offset = base_off + dice.offset, |
| 5253 | | .length = dice.length, |
| 5254 | | .kind = dice.kind, |
| 5255 | | }; |
| 5256 | | buf.appendSliceAssumeCapacity(mem.asBytes(&rebased_dice)); |
| 5257 | | } |
| 5258 | | } |
| 5259 | | |
| 5260 | | if (block.next) |next| { |
| 5261 | | block = next; |
| 5262 | | } else break; |
| 3890 | if (self.data_in_code_cmd_index == null) { |
| 3891 | self.data_in_code_cmd_index = @intCast(u16, self.load_commands.items.len); |
| 3892 | try self.load_commands.append(self.base.allocator, .{ |
| 3893 | .LinkeditData = .{ |
| 3894 | .cmd = macho.LC_DATA_IN_CODE, |
| 3895 | .cmdsize = @sizeOf(macho.linkedit_data_command), |
| 3896 | .dataoff = 0, |
| 3897 | .datasize = 0, |
| 3898 | }, |
| 3899 | }); |
| 3900 | self.load_commands_dirty = true; |
| 5263 | 3901 | } |
| 5264 | 3902 | |
| 5265 | | const datasize = @intCast(u32, buf.items.len); |
| 5266 | | |
| 5267 | | dice_cmd.dataoff = @intCast(u32, fileoff); |
| 5268 | | dice_cmd.datasize = datasize; |
| 5269 | | seg.inner.filesize += datasize; |
| 5270 | | |
| 5271 | | log.debug("writing data-in-code from 0x{x} to 0x{x}", .{ fileoff, fileoff + datasize }); |
| 5272 | | |
| 5273 | | try self.base.file.?.pwriteAll(buf.items, fileoff); |
| 3903 | self.cold_start = true; |
| 5274 | 3904 | } |
| 5275 | 3905 | |
| 5276 | | fn writeCodeSignaturePadding(self: *MachO) !void { |
| 5277 | | // TODO figure out how not to rewrite padding every single time. |
| 5278 | | const tracy = trace(@src()); |
| 5279 | | defer tracy.end(); |
| 5280 | | |
| 5281 | | const linkedit_segment = &self.load_commands.items[self.linkedit_segment_cmd_index.?].Segment; |
| 5282 | | const code_sig_cmd = &self.load_commands.items[self.code_signature_cmd_index.?].LinkeditData; |
| 5283 | | const fileoff = linkedit_segment.inner.fileoff + linkedit_segment.inner.filesize; |
| 5284 | | const needed_size = CodeSignature.calcCodeSignaturePaddingSize( |
| 5285 | | self.base.options.emit.?.sub_path, |
| 5286 | | fileoff, |
| 5287 | | self.page_size, |
| 5288 | | ); |
| 5289 | | code_sig_cmd.dataoff = @intCast(u32, fileoff); |
| 5290 | | code_sig_cmd.datasize = needed_size; |
| 3906 | const AllocateSectionOpts = struct { |
| 3907 | flags: u32 = macho.S_REGULAR, |
| 3908 | reserved1: u32 = 0, |
| 3909 | reserved2: u32 = 0, |
| 3910 | }; |
| 5291 | 3911 | |
| 5292 | | // Advance size of __LINKEDIT segment |
| 5293 | | linkedit_segment.inner.filesize += needed_size; |
| 5294 | | if (linkedit_segment.inner.vmsize < linkedit_segment.inner.filesize) { |
| 5295 | | linkedit_segment.inner.vmsize = mem.alignForwardGeneric(u64, linkedit_segment.inner.filesize, self.page_size); |
| 5296 | | } |
| 5297 | | log.debug("writing code signature padding from 0x{x} to 0x{x}", .{ fileoff, fileoff + needed_size }); |
| 5298 | | // Pad out the space. We need to do this to calculate valid hashes for everything in the file |
| 5299 | | // except for code signature data. |
| 5300 | | try self.base.file.?.pwriteAll(&[_]u8{0}, fileoff + needed_size - 1); |
| 5301 | | self.load_commands_dirty = true; |
| 5302 | | } |
| 3912 | fn allocateSection( |
| 3913 | self: *MachO, |
| 3914 | segment_id: u16, |
| 3915 | sectname: []const u8, |
| 3916 | size: u64, |
| 3917 | alignment: u32, |
| 3918 | opts: AllocateSectionOpts, |
| 3919 | ) !u16 { |
| 3920 | const seg = &self.load_commands.items[segment_id].Segment; |
| 3921 | var sect = macho.section_64{ |
| 3922 | .sectname = makeStaticString(sectname), |
| 3923 | .segname = seg.inner.segname, |
| 3924 | .size = @intCast(u32, size), |
| 3925 | .@"align" = alignment, |
| 3926 | .flags = opts.flags, |
| 3927 | .reserved1 = opts.reserved1, |
| 3928 | .reserved2 = opts.reserved2, |
| 3929 | }; |
| 5303 | 3930 | |
| 5304 | | fn writeCodeSignature(self: *MachO) !void { |
| 5305 | | const tracy = trace(@src()); |
| 5306 | | defer tracy.end(); |
| 3931 | const alignment_pow_2 = try math.powi(u32, 2, alignment); |
| 3932 | const padding: ?u64 = if (segment_id == self.text_segment_cmd_index.?) self.header_pad else null; |
| 3933 | const off = self.findFreeSpace(segment_id, alignment_pow_2, padding); |
| 5307 | 3934 | |
| 5308 | | const text_segment = self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 5309 | | const code_sig_cmd = self.load_commands.items[self.code_signature_cmd_index.?].LinkeditData; |
| 3935 | log.debug("allocating {s},{s} section from 0x{x} to 0x{x}", .{ |
| 3936 | commands.segmentName(sect), |
| 3937 | commands.sectionName(sect), |
| 3938 | off, |
| 3939 | off + size, |
| 3940 | }); |
| 5310 | 3941 | |
| 5311 | | var code_sig: CodeSignature = .{}; |
| 5312 | | defer code_sig.deinit(self.base.allocator); |
| 3942 | sect.addr = seg.inner.vmaddr + off - seg.inner.fileoff; |
| 3943 | sect.offset = @intCast(u32, off); |
| 5313 | 3944 | |
| 5314 | | try code_sig.calcAdhocSignature( |
| 5315 | | self.base.allocator, |
| 5316 | | self.base.file.?, |
| 5317 | | self.base.options.emit.?.sub_path, |
| 5318 | | text_segment.inner, |
| 5319 | | code_sig_cmd, |
| 5320 | | self.base.options.output_mode, |
| 5321 | | self.page_size, |
| 5322 | | ); |
| 3945 | const index = @intCast(u16, seg.sections.items.len); |
| 3946 | try seg.sections.append(self.base.allocator, sect); |
| 3947 | seg.inner.cmdsize += @sizeOf(macho.section_64); |
| 3948 | seg.inner.nsects += 1; |
| 5323 | 3949 | |
| 5324 | | var buffer = try self.base.allocator.alloc(u8, code_sig.size()); |
| 5325 | | defer self.base.allocator.free(buffer); |
| 5326 | | var stream = std.io.fixedBufferStream(buffer); |
| 5327 | | try code_sig.write(stream.writer()); |
| 3950 | const match = MatchingSection{ |
| 3951 | .seg = segment_id, |
| 3952 | .sect = index, |
| 3953 | }; |
| 3954 | _ = try self.section_ordinals.getOrPut(self.base.allocator, match); |
| 3955 | try self.atom_free_lists.putNoClobber(self.base.allocator, match, .{}); |
| 5328 | 3956 | |
| 5329 | | log.debug("writing code signature from 0x{x} to 0x{x}", .{ code_sig_cmd.dataoff, code_sig_cmd.dataoff + buffer.len }); |
| 3957 | self.load_commands_dirty = true; |
| 3958 | self.sections_order_dirty = true; |
| 5330 | 3959 | |
| 5331 | | try self.base.file.?.pwriteAll(buffer, code_sig_cmd.dataoff); |
| 3960 | return index; |
| 5332 | 3961 | } |
| 5333 | 3962 | |
| 5334 | | fn writeExportInfo(self: *MachO) !void { |
| 5335 | | if (!self.export_info_dirty) return; |
| 5336 | | if (self.globals.items.len == 0) return; |
| 3963 | fn findFreeSpace(self: MachO, segment_id: u16, alignment: u64, start: ?u64) u64 { |
| 3964 | const seg = self.load_commands.items[segment_id].Segment; |
| 3965 | if (seg.sections.items.len == 0) { |
| 3966 | return if (start) |v| v else seg.inner.fileoff; |
| 3967 | } |
| 3968 | const last_sect = seg.sections.items[seg.sections.items.len - 1]; |
| 3969 | const final_off = last_sect.offset + padToIdeal(last_sect.size); |
| 3970 | return mem.alignForwardGeneric(u64, final_off, alignment); |
| 3971 | } |
| 5337 | 3972 | |
| 3973 | fn growSection(self: *MachO, match: MatchingSection, new_size: u32) !void { |
| 5338 | 3974 | const tracy = trace(@src()); |
| 5339 | 3975 | defer tracy.end(); |
| 5340 | 3976 | |
| 5341 | | var trie: Trie = .{}; |
| 5342 | | defer trie.deinit(self.base.allocator); |
| 3977 | const seg = &self.load_commands.items[match.seg].Segment; |
| 3978 | const sect = &seg.sections.items[match.sect]; |
| 5343 | 3979 | |
| 5344 | | const text_segment = self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 5345 | | const base_address = text_segment.inner.vmaddr; |
| 3980 | const alignment = try math.powi(u32, 2, sect.@"align"); |
| 3981 | const max_size = self.allocatedSize(match.seg, sect.offset); |
| 3982 | const ideal_size = padToIdeal(new_size); |
| 3983 | const needed_size = mem.alignForwardGeneric(u32, ideal_size, alignment); |
| 5346 | 3984 | |
| 5347 | | // TODO handle macho.EXPORT_SYMBOL_FLAGS_REEXPORT and macho.EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER. |
| 5348 | | log.debug("writing export trie", .{}); |
| 3985 | if (needed_size > max_size) blk: { |
| 3986 | log.debug(" (need to grow!)", .{}); |
| 3987 | // Need to move all sections below in file and address spaces. |
| 3988 | const offset_amt = offset: { |
| 3989 | const max_alignment = try self.getSectionMaxAlignment(match.seg, match.sect + 1); |
| 3990 | break :offset mem.alignForwardGeneric(u64, needed_size - max_size, max_alignment); |
| 3991 | }; |
| 5349 | 3992 | |
| 5350 | | for (self.globals.items) |sym| { |
| 5351 | | const sym_name = self.getString(sym.n_strx); |
| 5352 | | log.debug(" | putting '{s}' defined at 0x{x}", .{ sym_name, sym.n_value }); |
| 3993 | // Before we commit to this, check if the segment needs to grow too. |
| 3994 | // We assume that each section header is growing linearly with the increasing |
| 3995 | // file offset / virtual memory address space. |
| 3996 | const last_sect = seg.sections.items[seg.sections.items.len - 1]; |
| 3997 | const last_sect_off = last_sect.offset + last_sect.size; |
| 3998 | const seg_off = seg.inner.fileoff + seg.inner.filesize; |
| 3999 | |
| 4000 | if (last_sect_off + offset_amt > seg_off) { |
| 4001 | // Need to grow segment first. |
| 4002 | log.debug(" (need to grow segment first)", .{}); |
| 4003 | const spill_size = (last_sect_off + offset_amt) - seg_off; |
| 4004 | const seg_offset_amt = mem.alignForwardGeneric(u64, spill_size, self.page_size); |
| 4005 | seg.inner.filesize += seg_offset_amt; |
| 4006 | seg.inner.vmsize += seg_offset_amt; |
| 4007 | |
| 4008 | log.debug(" (new {s} segment file offsets from 0x{x} to 0x{x} (in memory 0x{x} to 0x{x}))", .{ |
| 4009 | seg.inner.segname, |
| 4010 | seg.inner.fileoff, |
| 4011 | seg.inner.fileoff + seg.inner.filesize, |
| 4012 | seg.inner.vmaddr, |
| 4013 | seg.inner.vmaddr + seg.inner.vmsize, |
| 4014 | }); |
| 5353 | 4015 | |
| 5354 | | try trie.put(self.base.allocator, .{ |
| 5355 | | .name = sym_name, |
| 5356 | | .vmaddr_offset = sym.n_value - base_address, |
| 5357 | | .export_flags = macho.EXPORT_SYMBOL_FLAGS_KIND_REGULAR, |
| 5358 | | }); |
| 5359 | | } |
| 5360 | | try trie.finalize(self.base.allocator); |
| 4016 | // TODO We should probably nop the expanded by distance, or put 0s. |
| 4017 | |
| 4018 | // TODO copyRangeAll doesn't automatically extend the file on macOS. |
| 4019 | const ledit_seg = &self.load_commands.items[self.linkedit_segment_cmd_index.?].Segment; |
| 4020 | const new_filesize = seg_offset_amt + ledit_seg.inner.fileoff + ledit_seg.inner.filesize; |
| 4021 | try self.base.file.?.pwriteAll(&[_]u8{0}, new_filesize - 1); |
| 4022 | |
| 4023 | var next: usize = match.seg + 1; |
| 4024 | while (next < self.linkedit_segment_cmd_index.? + 1) : (next += 1) { |
| 4025 | const next_seg = &self.load_commands.items[next].Segment; |
| 4026 | _ = try self.base.file.?.copyRangeAll( |
| 4027 | next_seg.inner.fileoff, |
| 4028 | self.base.file.?, |
| 4029 | next_seg.inner.fileoff + seg_offset_amt, |
| 4030 | next_seg.inner.filesize, |
| 4031 | ); |
| 4032 | next_seg.inner.fileoff += seg_offset_amt; |
| 4033 | next_seg.inner.vmaddr += seg_offset_amt; |
| 4034 | |
| 4035 | log.debug(" (new {s} segment file offsets from 0x{x} to 0x{x} (in memory 0x{x} to 0x{x}))", .{ |
| 4036 | next_seg.inner.segname, |
| 4037 | next_seg.inner.fileoff, |
| 4038 | next_seg.inner.fileoff + next_seg.inner.filesize, |
| 4039 | next_seg.inner.vmaddr, |
| 4040 | next_seg.inner.vmaddr + next_seg.inner.vmsize, |
| 4041 | }); |
| 5361 | 4042 | |
| 5362 | | var buffer = try self.base.allocator.alloc(u8, @intCast(usize, trie.size)); |
| 5363 | | defer self.base.allocator.free(buffer); |
| 5364 | | var stream = std.io.fixedBufferStream(buffer); |
| 5365 | | const nwritten = try trie.write(stream.writer()); |
| 5366 | | assert(nwritten == trie.size); |
| 4043 | for (next_seg.sections.items) |*moved_sect, moved_sect_id| { |
| 4044 | moved_sect.offset += @intCast(u32, seg_offset_amt); |
| 4045 | moved_sect.addr += seg_offset_amt; |
| 4046 | |
| 4047 | log.debug(" (new {s},{s} file offsets from 0x{x} to 0x{x} (in memory 0x{x} to 0x{x}))", .{ |
| 4048 | commands.segmentName(moved_sect.*), |
| 4049 | commands.sectionName(moved_sect.*), |
| 4050 | moved_sect.offset, |
| 4051 | moved_sect.offset + moved_sect.size, |
| 4052 | moved_sect.addr, |
| 4053 | moved_sect.addr + moved_sect.size, |
| 4054 | }); |
| 5367 | 4055 | |
| 5368 | | const dyld_info = &self.load_commands.items[self.dyld_info_cmd_index.?].DyldInfoOnly; |
| 5369 | | const allocated_size = self.allocatedSizeLinkedit(dyld_info.export_off); |
| 5370 | | const needed_size = mem.alignForwardGeneric(u64, buffer.len, @alignOf(u64)); |
| 4056 | try self.allocateLocalSymbols(.{ |
| 4057 | .seg = @intCast(u16, next), |
| 4058 | .sect = @intCast(u16, moved_sect_id), |
| 4059 | }, @intCast(i64, seg_offset_amt)); |
| 4060 | } |
| 4061 | } |
| 4062 | } |
| 4063 | |
| 4064 | if (match.sect + 1 >= seg.sections.items.len) break :blk; |
| 4065 | |
| 4066 | // We have enough space to expand within the segment, so move all sections by |
| 4067 | // the required amount and update their header offsets. |
| 4068 | const next_sect = seg.sections.items[match.sect + 1]; |
| 4069 | const total_size = last_sect_off - next_sect.offset; |
| 4070 | _ = try self.base.file.?.copyRangeAll( |
| 4071 | next_sect.offset, |
| 4072 | self.base.file.?, |
| 4073 | next_sect.offset + offset_amt, |
| 4074 | total_size, |
| 4075 | ); |
| 4076 | |
| 4077 | var next = match.sect + 1; |
| 4078 | while (next < seg.sections.items.len) : (next += 1) { |
| 4079 | const moved_sect = &seg.sections.items[next]; |
| 4080 | moved_sect.offset += @intCast(u32, offset_amt); |
| 4081 | moved_sect.addr += offset_amt; |
| 4082 | |
| 4083 | log.debug(" (new {s},{s} file offsets from 0x{x} to 0x{x} (in memory 0x{x} to 0x{x}))", .{ |
| 4084 | commands.segmentName(moved_sect.*), |
| 4085 | commands.sectionName(moved_sect.*), |
| 4086 | moved_sect.offset, |
| 4087 | moved_sect.offset + moved_sect.size, |
| 4088 | moved_sect.addr, |
| 4089 | moved_sect.addr + moved_sect.size, |
| 4090 | }); |
| 5371 | 4091 | |
| 5372 | | if (needed_size > allocated_size) { |
| 5373 | | dyld_info.export_off = 0; |
| 5374 | | dyld_info.export_off = @intCast(u32, self.findFreeSpaceLinkedit(needed_size, 1, null)); |
| 5375 | | // TODO this might require relocating all following LC_DYLD_INFO_ONLY sections too. |
| 4092 | try self.allocateLocalSymbols(.{ |
| 4093 | .seg = match.seg, |
| 4094 | .sect = next, |
| 4095 | }, @intCast(i64, offset_amt)); |
| 4096 | } |
| 5376 | 4097 | } |
| 5377 | | dyld_info.export_size = @intCast(u32, needed_size); |
| 5378 | | log.debug("writing export info from 0x{x} to 0x{x}", .{ dyld_info.export_off, dyld_info.export_off + dyld_info.export_size }); |
| 4098 | } |
| 5379 | 4099 | |
| 5380 | | try self.base.file.?.pwriteAll(buffer, dyld_info.export_off); |
| 5381 | | self.load_commands_dirty = true; |
| 5382 | | self.export_info_dirty = false; |
| 4100 | fn allocatedSize(self: MachO, segment_id: u16, start: u64) u64 { |
| 4101 | const seg = self.load_commands.items[segment_id].Segment; |
| 4102 | assert(start >= seg.inner.fileoff); |
| 4103 | var min_pos: u64 = seg.inner.fileoff + seg.inner.filesize; |
| 4104 | if (start > min_pos) return 0; |
| 4105 | for (seg.sections.items) |section| { |
| 4106 | if (section.offset <= start) continue; |
| 4107 | if (section.offset < min_pos) min_pos = section.offset; |
| 4108 | } |
| 4109 | return min_pos - start; |
| 5383 | 4110 | } |
| 5384 | 4111 | |
| 5385 | | fn writeRebaseInfoTable(self: *MachO) !void { |
| 5386 | | if (!self.rebase_info_dirty) return; |
| 4112 | fn getSectionMaxAlignment(self: *MachO, segment_id: u16, start_sect_id: u16) !u32 { |
| 4113 | const seg = self.load_commands.items[segment_id].Segment; |
| 4114 | var max_alignment: u32 = 1; |
| 4115 | var next = start_sect_id; |
| 4116 | while (next < seg.sections.items.len) : (next += 1) { |
| 4117 | const sect = seg.sections.items[next]; |
| 4118 | const alignment = try math.powi(u32, 2, sect.@"align"); |
| 4119 | max_alignment = math.max(max_alignment, alignment); |
| 4120 | } |
| 4121 | return max_alignment; |
| 4122 | } |
| 5387 | 4123 | |
| 4124 | fn allocateAtom(self: *MachO, atom: *Atom, new_atom_size: u64, alignment: u64, match: MatchingSection) !u64 { |
| 5388 | 4125 | const tracy = trace(@src()); |
| 5389 | 4126 | defer tracy.end(); |
| 5390 | 4127 | |
| 5391 | | var pointers = std.ArrayList(bind.Pointer).init(self.base.allocator); |
| 5392 | | defer pointers.deinit(); |
| 4128 | const seg = &self.load_commands.items[match.seg].Segment; |
| 4129 | const sect = &seg.sections.items[match.sect]; |
| 4130 | var free_list = self.atom_free_lists.get(match).?; |
| 4131 | const needs_padding = match.seg == self.text_segment_cmd_index.? and match.sect == self.text_section_index.?; |
| 4132 | const new_atom_ideal_capacity = if (needs_padding) padToIdeal(new_atom_size) else new_atom_size; |
| 5393 | 4133 | |
| 5394 | | { |
| 5395 | | var it = self.blocks.iterator(); |
| 5396 | | while (it.next()) |entry| { |
| 5397 | | const match = entry.key_ptr.*; |
| 5398 | | var block: *TextBlock = entry.value_ptr.*; |
| 5399 | | |
| 5400 | | if (match.seg == self.text_segment_cmd_index.?) continue; // __TEXT is non-writable |
| 5401 | | |
| 5402 | | const seg = self.load_commands.items[match.seg].Segment; |
| 5403 | | |
| 5404 | | while (true) { |
| 5405 | | const sym = self.locals.items[block.local_sym_index]; |
| 5406 | | const base_offset = sym.n_value - seg.inner.vmaddr; |
| 4134 | // We use these to indicate our intention to update metadata, placing the new atom, |
| 4135 | // and possibly removing a free list node. |
| 4136 | // It would be simpler to do it inside the for loop below, but that would cause a |
| 4137 | // problem if an error was returned later in the function. So this action |
| 4138 | // is actually carried out at the end of the function, when errors are no longer possible. |
| 4139 | var atom_placement: ?*Atom = null; |
| 4140 | var free_list_removal: ?usize = null; |
| 5407 | 4141 | |
| 5408 | | for (block.rebases.items) |offset| { |
| 5409 | | try pointers.append(.{ |
| 5410 | | .offset = base_offset + offset, |
| 5411 | | .segment_id = match.seg, |
| 5412 | | }); |
| 4142 | // First we look for an appropriately sized free list node. |
| 4143 | // The list is unordered. We'll just take the first thing that works. |
| 4144 | var vaddr = blk: { |
| 4145 | var i: usize = 0; |
| 4146 | while (i < free_list.items.len) { |
| 4147 | const big_atom = free_list.items[i]; |
| 4148 | // We now have a pointer to a live atom that has too much capacity. |
| 4149 | // Is it enough that we could fit this new atom? |
| 4150 | const sym = self.locals.items[big_atom.local_sym_index]; |
| 4151 | const capacity = big_atom.capacity(self.*); |
| 4152 | const ideal_capacity = if (needs_padding) padToIdeal(capacity) else capacity; |
| 4153 | const ideal_capacity_end_vaddr = sym.n_value + ideal_capacity; |
| 4154 | const capacity_end_vaddr = sym.n_value + capacity; |
| 4155 | const new_start_vaddr_unaligned = capacity_end_vaddr - new_atom_ideal_capacity; |
| 4156 | const new_start_vaddr = mem.alignBackwardGeneric(u64, new_start_vaddr_unaligned, alignment); |
| 4157 | if (new_start_vaddr < ideal_capacity_end_vaddr) { |
| 4158 | // Additional bookkeeping here to notice if this free list node |
| 4159 | // should be deleted because the atom that it points to has grown to take up |
| 4160 | // more of the extra capacity. |
| 4161 | if (!big_atom.freeListEligible(self.*)) { |
| 4162 | const bl = free_list.swapRemove(i); |
| 4163 | bl.deinit(self.base.allocator); |
| 4164 | } else { |
| 4165 | i += 1; |
| 5413 | 4166 | } |
| 4167 | continue; |
| 4168 | } |
| 4169 | // At this point we know that we will place the new atom here. But the |
| 4170 | // remaining question is whether there is still yet enough capacity left |
| 4171 | // over for there to still be a free list node. |
| 4172 | const remaining_capacity = new_start_vaddr - ideal_capacity_end_vaddr; |
| 4173 | const keep_free_list_node = remaining_capacity >= min_text_capacity; |
| 5414 | 4174 | |
| 5415 | | if (block.prev) |prev| { |
| 5416 | | block = prev; |
| 5417 | | } else break; |
| 4175 | // Set up the metadata to be updated, after errors are no longer possible. |
| 4176 | atom_placement = big_atom; |
| 4177 | if (!keep_free_list_node) { |
| 4178 | free_list_removal = i; |
| 5418 | 4179 | } |
| 4180 | break :blk new_start_vaddr; |
| 4181 | } else if (self.atoms.get(match)) |last| { |
| 4182 | const last_symbol = self.locals.items[last.local_sym_index]; |
| 4183 | const ideal_capacity = if (needs_padding) padToIdeal(last.size) else last.size; |
| 4184 | const ideal_capacity_end_vaddr = last_symbol.n_value + ideal_capacity; |
| 4185 | const new_start_vaddr = mem.alignForwardGeneric(u64, ideal_capacity_end_vaddr, alignment); |
| 4186 | atom_placement = last; |
| 4187 | break :blk new_start_vaddr; |
| 4188 | } else { |
| 4189 | break :blk mem.alignForwardGeneric(u64, sect.addr, alignment); |
| 5419 | 4190 | } |
| 5420 | | } |
| 5421 | | |
| 5422 | | if (self.got_section_index) |idx| { |
| 5423 | | const seg = self.load_commands.items[self.data_const_segment_cmd_index.?].Segment; |
| 5424 | | const sect = seg.sections.items[idx]; |
| 5425 | | const base_offset = sect.addr - seg.inner.vmaddr; |
| 5426 | | const segment_id = @intCast(u16, self.data_const_segment_cmd_index.?); |
| 4191 | }; |
| 5427 | 4192 | |
| 5428 | | for (self.got_entries.items) |entry, i| { |
| 5429 | | if (entry.where == .undef) continue; |
| 4193 | const expand_section = atom_placement == null or atom_placement.?.next == null; |
| 4194 | if (expand_section) { |
| 4195 | const needed_size = @intCast(u32, (vaddr + new_atom_size) - sect.addr); |
| 4196 | try self.growSection(match, needed_size); |
| 4197 | _ = try self.atoms.put(self.base.allocator, match, atom); |
| 4198 | sect.size = needed_size; |
| 4199 | self.load_commands_dirty = true; |
| 4200 | } |
| 4201 | const align_pow = @intCast(u32, math.log2(alignment)); |
| 4202 | if (sect.@"align" < align_pow) { |
| 4203 | sect.@"align" = align_pow; |
| 4204 | self.load_commands_dirty = true; |
| 4205 | } |
| 4206 | atom.size = new_atom_size; |
| 4207 | atom.alignment = align_pow; |
| 5430 | 4208 | |
| 5431 | | try pointers.append(.{ |
| 5432 | | .offset = base_offset + i * @sizeOf(u64), |
| 5433 | | .segment_id = segment_id, |
| 5434 | | }); |
| 5435 | | } |
| 4209 | if (atom.prev) |prev| { |
| 4210 | prev.next = atom.next; |
| 4211 | } |
| 4212 | if (atom.next) |next| { |
| 4213 | next.prev = atom.prev; |
| 5436 | 4214 | } |
| 5437 | 4215 | |
| 5438 | | if (self.la_symbol_ptr_section_index) |idx| { |
| 5439 | | const seg = self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 5440 | | const sect = seg.sections.items[idx]; |
| 5441 | | const base_offset = sect.addr - seg.inner.vmaddr; |
| 5442 | | const segment_id = @intCast(u16, self.data_segment_cmd_index.?); |
| 5443 | | |
| 5444 | | try pointers.ensureUnusedCapacity(self.stubs.items.len); |
| 5445 | | for (self.stubs.items) |_, i| { |
| 5446 | | pointers.appendAssumeCapacity(.{ |
| 5447 | | .offset = base_offset + i * @sizeOf(u64), |
| 5448 | | .segment_id = segment_id, |
| 5449 | | }); |
| 5450 | | } |
| 4216 | if (atom_placement) |big_atom| { |
| 4217 | atom.prev = big_atom; |
| 4218 | atom.next = big_atom.next; |
| 4219 | big_atom.next = atom; |
| 4220 | } else { |
| 4221 | atom.prev = null; |
| 4222 | atom.next = null; |
| 4223 | } |
| 4224 | if (free_list_removal) |i| { |
| 4225 | _ = free_list.swapRemove(i); |
| 5451 | 4226 | } |
| 5452 | 4227 | |
| 5453 | | std.sort.sort(bind.Pointer, pointers.items, {}, bind.pointerCmp); |
| 4228 | return vaddr; |
| 4229 | } |
| 5454 | 4230 | |
| 5455 | | const size = try bind.rebaseInfoSize(pointers.items); |
| 5456 | | var buffer = try self.base.allocator.alloc(u8, @intCast(usize, size)); |
| 5457 | | defer self.base.allocator.free(buffer); |
| 4231 | pub fn addExternFn(self: *MachO, name: []const u8) !u32 { |
| 4232 | const sym_name = try std.fmt.allocPrint(self.base.allocator, "_{s}", .{name}); |
| 4233 | defer self.base.allocator.free(sym_name); |
| 5458 | 4234 | |
| 5459 | | var stream = std.io.fixedBufferStream(buffer); |
| 5460 | | try bind.writeRebaseInfo(pointers.items, stream.writer()); |
| 4235 | if (self.strtab_dir.getKeyAdapted(@as([]const u8, sym_name), StringIndexAdapter{ |
| 4236 | .bytes = &self.strtab, |
| 4237 | })) |n_strx| { |
| 4238 | const resolv = self.symbol_resolver.get(n_strx) orelse unreachable; |
| 4239 | return resolv.where_index; |
| 4240 | } |
| 5461 | 4241 | |
| 5462 | | const dyld_info = &self.load_commands.items[self.dyld_info_cmd_index.?].DyldInfoOnly; |
| 5463 | | const allocated_size = self.allocatedSizeLinkedit(dyld_info.rebase_off); |
| 5464 | | const needed_size = mem.alignForwardGeneric(u64, buffer.len, @alignOf(u64)); |
| 4242 | log.debug("adding new extern function '{s}'", .{sym_name}); |
| 4243 | const sym_index = @intCast(u32, self.undefs.items.len); |
| 4244 | const n_strx = try self.makeString(sym_name); |
| 4245 | try self.undefs.append(self.base.allocator, .{ |
| 4246 | .n_strx = n_strx, |
| 4247 | .n_type = macho.N_UNDF, |
| 4248 | .n_sect = 0, |
| 4249 | .n_desc = 0, |
| 4250 | .n_value = 0, |
| 4251 | }); |
| 4252 | try self.symbol_resolver.putNoClobber(self.base.allocator, n_strx, .{ |
| 4253 | .where = .undef, |
| 4254 | .where_index = sym_index, |
| 4255 | }); |
| 4256 | try self.unresolved.putNoClobber(self.base.allocator, sym_index, .stub); |
| 5465 | 4257 | |
| 5466 | | if (needed_size > allocated_size) { |
| 5467 | | dyld_info.rebase_off = 0; |
| 5468 | | dyld_info.rebase_off = @intCast(u32, self.findFreeSpaceLinkedit(needed_size, 1, null)); |
| 5469 | | // TODO this might require relocating all following LC_DYLD_INFO_ONLY sections too. |
| 5470 | | } |
| 4258 | return sym_index; |
| 4259 | } |
| 5471 | 4260 | |
| 5472 | | dyld_info.rebase_size = @intCast(u32, needed_size); |
| 5473 | | log.debug("writing rebase info from 0x{x} to 0x{x}", .{ dyld_info.rebase_off, dyld_info.rebase_off + dyld_info.rebase_size }); |
| 4261 | const NextSegmentAddressAndOffset = struct { |
| 4262 | address: u64, |
| 4263 | offset: u64, |
| 4264 | }; |
| 5474 | 4265 | |
| 5475 | | try self.base.file.?.pwriteAll(buffer, dyld_info.rebase_off); |
| 5476 | | self.load_commands_dirty = true; |
| 5477 | | self.rebase_info_dirty = false; |
| 4266 | fn nextSegmentAddressAndOffset(self: *MachO) NextSegmentAddressAndOffset { |
| 4267 | var prev_segment_idx: ?usize = null; // We use optional here for safety. |
| 4268 | for (self.load_commands.items) |cmd, i| { |
| 4269 | if (cmd == .Segment) { |
| 4270 | prev_segment_idx = i; |
| 4271 | } |
| 4272 | } |
| 4273 | const prev_segment = self.load_commands.items[prev_segment_idx.?].Segment; |
| 4274 | const address = prev_segment.inner.vmaddr + prev_segment.inner.vmsize; |
| 4275 | const offset = prev_segment.inner.fileoff + prev_segment.inner.filesize; |
| 4276 | return .{ |
| 4277 | .address = address, |
| 4278 | .offset = offset, |
| 4279 | }; |
| 5478 | 4280 | } |
| 5479 | 4281 | |
| 5480 | | fn writeBindInfoTable(self: *MachO) !void { |
| 5481 | | if (!self.binding_info_dirty) return; |
| 4282 | fn updateSectionOrdinals(self: *MachO) !void { |
| 4283 | if (!self.sections_order_dirty) return; |
| 5482 | 4284 | |
| 5483 | 4285 | const tracy = trace(@src()); |
| 5484 | 4286 | defer tracy.end(); |
| 5485 | 4287 | |
| 5486 | | var pointers = std.ArrayList(bind.Pointer).init(self.base.allocator); |
| 5487 | | defer pointers.deinit(); |
| 4288 | var ordinal_remap = std.AutoHashMap(u8, u8).init(self.base.allocator); |
| 4289 | defer ordinal_remap.deinit(); |
| 4290 | var ordinals: std.AutoArrayHashMapUnmanaged(MatchingSection, void) = .{}; |
| 5488 | 4291 | |
| 5489 | | if (self.got_section_index) |idx| { |
| 5490 | | const seg = self.load_commands.items[self.data_const_segment_cmd_index.?].Segment; |
| 5491 | | const sect = seg.sections.items[idx]; |
| 5492 | | const base_offset = sect.addr - seg.inner.vmaddr; |
| 5493 | | const segment_id = @intCast(u16, self.data_const_segment_cmd_index.?); |
| 4292 | var new_ordinal: u8 = 0; |
| 4293 | for (self.load_commands.items) |lc, lc_id| { |
| 4294 | if (lc != .Segment) break; |
| 5494 | 4295 | |
| 5495 | | for (self.got_entries.items) |entry, i| { |
| 5496 | | if (entry.where == .local) continue; |
| 5497 | | |
| 5498 | | const sym = self.undefs.items[entry.where_index]; |
| 5499 | | try pointers.append(.{ |
| 5500 | | .offset = base_offset + i * @sizeOf(u64), |
| 5501 | | .segment_id = segment_id, |
| 5502 | | .dylib_ordinal = @divExact(sym.n_desc, macho.N_SYMBOL_RESOLVER), |
| 5503 | | .name = self.getString(sym.n_strx), |
| 5504 | | }); |
| 4296 | for (lc.Segment.sections.items) |_, sect_id| { |
| 4297 | const match = MatchingSection{ |
| 4298 | .seg = @intCast(u16, lc_id), |
| 4299 | .sect = @intCast(u16, sect_id), |
| 4300 | }; |
| 4301 | const old_ordinal = @intCast(u8, self.section_ordinals.getIndex(match).? + 1); |
| 4302 | new_ordinal += 1; |
| 4303 | try ordinal_remap.putNoClobber(old_ordinal, new_ordinal); |
| 4304 | try ordinals.putNoClobber(self.base.allocator, match, {}); |
| 5505 | 4305 | } |
| 5506 | 4306 | } |
| 5507 | 4307 | |
| 4308 | for (self.locals.items) |*sym| { |
| 4309 | if (sym.n_sect == 0) continue; |
| 4310 | sym.n_sect = ordinal_remap.get(sym.n_sect).?; |
| 4311 | } |
| 4312 | for (self.globals.items) |*sym| { |
| 4313 | sym.n_sect = ordinal_remap.get(sym.n_sect).?; |
| 4314 | } |
| 4315 | |
| 4316 | self.section_ordinals.deinit(self.base.allocator); |
| 4317 | self.section_ordinals = ordinals; |
| 4318 | } |
| 4319 | |
| 4320 | fn writeDyldInfoData(self: *MachO) !void { |
| 4321 | const tracy = trace(@src()); |
| 4322 | defer tracy.end(); |
| 4323 | |
| 4324 | var rebase_pointers = std.ArrayList(bind.Pointer).init(self.base.allocator); |
| 4325 | defer rebase_pointers.deinit(); |
| 4326 | var bind_pointers = std.ArrayList(bind.Pointer).init(self.base.allocator); |
| 4327 | defer bind_pointers.deinit(); |
| 4328 | var lazy_bind_pointers = std.ArrayList(bind.Pointer).init(self.base.allocator); |
| 4329 | defer lazy_bind_pointers.deinit(); |
| 4330 | |
| 5508 | 4331 | { |
| 5509 | | var it = self.blocks.iterator(); |
| 4332 | var it = self.atoms.iterator(); |
| 5510 | 4333 | while (it.next()) |entry| { |
| 5511 | 4334 | const match = entry.key_ptr.*; |
| 5512 | | var block: *TextBlock = entry.value_ptr.*; |
| 4335 | var atom: *Atom = entry.value_ptr.*; |
| 5513 | 4336 | |
| 5514 | 4337 | if (match.seg == self.text_segment_cmd_index.?) continue; // __TEXT is non-writable |
| 5515 | 4338 | |
| 5516 | 4339 | const seg = self.load_commands.items[match.seg].Segment; |
| 5517 | 4340 | |
| 5518 | 4341 | while (true) { |
| 5519 | | const sym = self.locals.items[block.local_sym_index]; |
| 4342 | const sym = self.locals.items[atom.local_sym_index]; |
| 5520 | 4343 | const base_offset = sym.n_value - seg.inner.vmaddr; |
| 5521 | 4344 | |
| 5522 | | for (block.bindings.items) |binding| { |
| 4345 | for (atom.rebases.items) |offset| { |
| 4346 | try rebase_pointers.append(.{ |
| 4347 | .offset = base_offset + offset, |
| 4348 | .segment_id = match.seg, |
| 4349 | }); |
| 4350 | } |
| 4351 | |
| 4352 | for (atom.bindings.items) |binding| { |
| 4353 | const bind_sym = self.undefs.items[binding.local_sym_index]; |
| 4354 | try bind_pointers.append(.{ |
| 4355 | .offset = binding.offset + base_offset, |
| 4356 | .segment_id = match.seg, |
| 4357 | .dylib_ordinal = @divExact(bind_sym.n_desc, macho.N_SYMBOL_RESOLVER), |
| 4358 | .name = self.getString(bind_sym.n_strx), |
| 4359 | }); |
| 4360 | } |
| 4361 | |
| 4362 | for (atom.lazy_bindings.items) |binding| { |
| 5523 | 4363 | const bind_sym = self.undefs.items[binding.local_sym_index]; |
| 5524 | | try pointers.append(.{ |
| 4364 | try lazy_bind_pointers.append(.{ |
| 5525 | 4365 | .offset = binding.offset + base_offset, |
| 5526 | 4366 | .segment_id = match.seg, |
| 5527 | 4367 | .dylib_ordinal = @divExact(bind_sym.n_desc, macho.N_SYMBOL_RESOLVER), |
| ... | ... | @@ -5529,94 +4369,105 @@ fn writeBindInfoTable(self: *MachO) !void { |
| 5529 | 4369 | }); |
| 5530 | 4370 | } |
| 5531 | 4371 | |
| 5532 | | if (block.prev) |prev| { |
| 5533 | | block = prev; |
| 4372 | if (atom.prev) |prev| { |
| 4373 | atom = prev; |
| 5534 | 4374 | } else break; |
| 5535 | 4375 | } |
| 5536 | 4376 | } |
| 5537 | 4377 | } |
| 5538 | 4378 | |
| 5539 | | const size = try bind.bindInfoSize(pointers.items); |
| 5540 | | var buffer = try self.base.allocator.alloc(u8, @intCast(usize, size)); |
| 5541 | | defer self.base.allocator.free(buffer); |
| 5542 | | |
| 5543 | | var stream = std.io.fixedBufferStream(buffer); |
| 5544 | | try bind.writeBindInfo(pointers.items, stream.writer()); |
| 4379 | var trie: Trie = .{}; |
| 4380 | defer trie.deinit(self.base.allocator); |
| 5545 | 4381 | |
| 5546 | | const dyld_info = &self.load_commands.items[self.dyld_info_cmd_index.?].DyldInfoOnly; |
| 5547 | | const allocated_size = self.allocatedSizeLinkedit(dyld_info.bind_off); |
| 5548 | | const needed_size = mem.alignForwardGeneric(u64, buffer.len, @alignOf(u64)); |
| 4382 | { |
| 4383 | // TODO handle macho.EXPORT_SYMBOL_FLAGS_REEXPORT and macho.EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER. |
| 4384 | log.debug("generating export trie", .{}); |
| 4385 | const text_segment = self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 4386 | const base_address = text_segment.inner.vmaddr; |
| 4387 | |
| 4388 | for (self.globals.items) |sym| { |
| 4389 | const sym_name = self.getString(sym.n_strx); |
| 4390 | log.debug(" (putting '{s}' defined at 0x{x})", .{ sym_name, sym.n_value }); |
| 4391 | |
| 4392 | try trie.put(self.base.allocator, .{ |
| 4393 | .name = sym_name, |
| 4394 | .vmaddr_offset = sym.n_value - base_address, |
| 4395 | .export_flags = macho.EXPORT_SYMBOL_FLAGS_KIND_REGULAR, |
| 4396 | }); |
| 4397 | } |
| 5549 | 4398 | |
| 5550 | | if (needed_size > allocated_size) { |
| 5551 | | dyld_info.bind_off = 0; |
| 5552 | | dyld_info.bind_off = @intCast(u32, self.findFreeSpaceLinkedit(needed_size, 1, null)); |
| 5553 | | // TODO this might require relocating all following LC_DYLD_INFO_ONLY sections too. |
| 4399 | try trie.finalize(self.base.allocator); |
| 5554 | 4400 | } |
| 5555 | 4401 | |
| 5556 | | dyld_info.bind_size = @intCast(u32, needed_size); |
| 5557 | | log.debug("writing binding info from 0x{x} to 0x{x}", .{ dyld_info.bind_off, dyld_info.bind_off + dyld_info.bind_size }); |
| 5558 | | |
| 5559 | | try self.base.file.?.pwriteAll(buffer, dyld_info.bind_off); |
| 5560 | | self.load_commands_dirty = true; |
| 5561 | | self.binding_info_dirty = false; |
| 5562 | | } |
| 5563 | | |
| 5564 | | fn writeLazyBindInfoTable(self: *MachO) !void { |
| 5565 | | if (!self.lazy_binding_info_dirty) return; |
| 4402 | const seg = &self.load_commands.items[self.linkedit_segment_cmd_index.?].Segment; |
| 4403 | const dyld_info = &self.load_commands.items[self.dyld_info_cmd_index.?].DyldInfoOnly; |
| 4404 | const rebase_size = try bind.rebaseInfoSize(rebase_pointers.items); |
| 4405 | const bind_size = try bind.bindInfoSize(bind_pointers.items); |
| 4406 | const lazy_bind_size = try bind.lazyBindInfoSize(lazy_bind_pointers.items); |
| 4407 | const export_size = trie.size; |
| 5566 | 4408 | |
| 5567 | | const tracy = trace(@src()); |
| 5568 | | defer tracy.end(); |
| 4409 | dyld_info.rebase_off = @intCast(u32, seg.inner.fileoff); |
| 4410 | dyld_info.rebase_size = @intCast(u32, mem.alignForwardGeneric(u64, rebase_size, @alignOf(u64))); |
| 4411 | seg.inner.filesize += dyld_info.rebase_size; |
| 5569 | 4412 | |
| 5570 | | var pointers = std.ArrayList(bind.Pointer).init(self.base.allocator); |
| 5571 | | defer pointers.deinit(); |
| 4413 | dyld_info.bind_off = dyld_info.rebase_off + dyld_info.rebase_size; |
| 4414 | dyld_info.bind_size = @intCast(u32, mem.alignForwardGeneric(u64, bind_size, @alignOf(u64))); |
| 4415 | seg.inner.filesize += dyld_info.bind_size; |
| 5572 | 4416 | |
| 5573 | | if (self.la_symbol_ptr_section_index) |idx| { |
| 5574 | | const seg = self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 5575 | | const sect = seg.sections.items[idx]; |
| 5576 | | const base_offset = sect.addr - seg.inner.vmaddr; |
| 5577 | | const segment_id = @intCast(u16, self.data_segment_cmd_index.?); |
| 5578 | | |
| 5579 | | try pointers.ensureUnusedCapacity(self.stubs.items.len); |
| 5580 | | |
| 5581 | | for (self.stubs.items) |import_id, i| { |
| 5582 | | const sym = self.undefs.items[import_id]; |
| 5583 | | pointers.appendAssumeCapacity(.{ |
| 5584 | | .offset = base_offset + i * @sizeOf(u64), |
| 5585 | | .segment_id = segment_id, |
| 5586 | | .dylib_ordinal = @divExact(sym.n_desc, macho.N_SYMBOL_RESOLVER), |
| 5587 | | .name = self.getString(sym.n_strx), |
| 5588 | | }); |
| 5589 | | } |
| 5590 | | } |
| 4417 | dyld_info.lazy_bind_off = dyld_info.bind_off + dyld_info.bind_size; |
| 4418 | dyld_info.lazy_bind_size = @intCast(u32, mem.alignForwardGeneric(u64, lazy_bind_size, @alignOf(u64))); |
| 4419 | seg.inner.filesize += dyld_info.lazy_bind_size; |
| 5591 | 4420 | |
| 5592 | | const size = try bind.lazyBindInfoSize(pointers.items); |
| 5593 | | var buffer = try self.base.allocator.alloc(u8, @intCast(usize, size)); |
| 4421 | dyld_info.export_off = dyld_info.lazy_bind_off + dyld_info.lazy_bind_size; |
| 4422 | dyld_info.export_size = @intCast(u32, mem.alignForwardGeneric(u64, export_size, @alignOf(u64))); |
| 4423 | seg.inner.filesize += dyld_info.export_size; |
| 4424 | |
| 4425 | const needed_size = dyld_info.rebase_size + dyld_info.bind_size + dyld_info.lazy_bind_size + dyld_info.export_size; |
| 4426 | var buffer = try self.base.allocator.alloc(u8, needed_size); |
| 5594 | 4427 | defer self.base.allocator.free(buffer); |
| 4428 | mem.set(u8, buffer, 0); |
| 5595 | 4429 | |
| 5596 | 4430 | var stream = std.io.fixedBufferStream(buffer); |
| 5597 | | try bind.writeLazyBindInfo(pointers.items, stream.writer()); |
| 4431 | const writer = stream.writer(); |
| 5598 | 4432 | |
| 5599 | | const dyld_info = &self.load_commands.items[self.dyld_info_cmd_index.?].DyldInfoOnly; |
| 5600 | | const allocated_size = self.allocatedSizeLinkedit(dyld_info.lazy_bind_off); |
| 5601 | | const needed_size = mem.alignForwardGeneric(u64, buffer.len, @alignOf(u64)); |
| 4433 | try bind.writeRebaseInfo(rebase_pointers.items, writer); |
| 4434 | try stream.seekBy(@intCast(i64, dyld_info.rebase_size) - @intCast(i64, rebase_size)); |
| 5602 | 4435 | |
| 5603 | | if (needed_size > allocated_size) { |
| 5604 | | dyld_info.lazy_bind_off = 0; |
| 5605 | | dyld_info.lazy_bind_off = @intCast(u32, self.findFreeSpaceLinkedit(needed_size, 1, null)); |
| 5606 | | // TODO this might require relocating all following LC_DYLD_INFO_ONLY sections too. |
| 5607 | | } |
| 4436 | try bind.writeBindInfo(bind_pointers.items, writer); |
| 4437 | try stream.seekBy(@intCast(i64, dyld_info.bind_size) - @intCast(i64, bind_size)); |
| 5608 | 4438 | |
| 5609 | | dyld_info.lazy_bind_size = @intCast(u32, needed_size); |
| 5610 | | log.debug("writing lazy binding info from 0x{x} to 0x{x}", .{ dyld_info.lazy_bind_off, dyld_info.lazy_bind_off + dyld_info.lazy_bind_size }); |
| 4439 | try bind.writeLazyBindInfo(lazy_bind_pointers.items, writer); |
| 4440 | try stream.seekBy(@intCast(i64, dyld_info.lazy_bind_size) - @intCast(i64, lazy_bind_size)); |
| 5611 | 4441 | |
| 5612 | | try self.base.file.?.pwriteAll(buffer, dyld_info.lazy_bind_off); |
| 5613 | | try self.populateLazyBindOffsetsInStubHelper(buffer); |
| 4442 | _ = try trie.write(writer); |
| 4443 | |
| 4444 | log.debug("writing dyld info from 0x{x} to 0x{x}", .{ |
| 4445 | dyld_info.rebase_off, |
| 4446 | dyld_info.rebase_off + needed_size, |
| 4447 | }); |
| 4448 | |
| 4449 | try self.base.file.?.pwriteAll(buffer, dyld_info.rebase_off); |
| 4450 | try self.populateLazyBindOffsetsInStubHelper( |
| 4451 | buffer[dyld_info.rebase_size + dyld_info.bind_size ..][0..dyld_info.lazy_bind_size], |
| 4452 | ); |
| 5614 | 4453 | self.load_commands_dirty = true; |
| 5615 | | self.lazy_binding_info_dirty = false; |
| 5616 | 4454 | } |
| 5617 | 4455 | |
| 5618 | 4456 | fn populateLazyBindOffsetsInStubHelper(self: *MachO, buffer: []const u8) !void { |
| 5619 | | if (self.stubs.items.len == 0) return; |
| 4457 | const last_atom = self.atoms.get(.{ |
| 4458 | .seg = self.text_segment_cmd_index.?, |
| 4459 | .sect = self.stub_helper_section_index.?, |
| 4460 | }) orelse return; |
| 4461 | if (last_atom == self.stub_helper_preamble_atom.?) return; |
| 4462 | |
| 4463 | // Because we insert lazy binding opcodes in reverse order (from last to the first atom), |
| 4464 | // we need reverse the order of atom traversal here as well. |
| 4465 | // TODO figure out a less error prone mechanims for this! |
| 4466 | var atom = last_atom; |
| 4467 | while (atom.prev) |prev| { |
| 4468 | atom = prev; |
| 4469 | } |
| 4470 | atom = atom.next.?; |
| 5620 | 4471 | |
| 5621 | 4472 | var stream = std.io.fixedBufferStream(buffer); |
| 5622 | 4473 | var reader = stream.reader(); |
| ... | ... | @@ -5661,50 +4512,245 @@ fn populateLazyBindOffsetsInStubHelper(self: *MachO, buffer: []const u8) !void { |
| 5661 | 4512 | else => {}, |
| 5662 | 4513 | } |
| 5663 | 4514 | } |
| 5664 | | assert(self.stubs.items.len <= offsets.items.len); |
| 5665 | 4515 | |
| 5666 | | const stub_size: u4 = switch (self.base.options.target.cpu.arch) { |
| 5667 | | .x86_64 => 10, |
| 5668 | | .aarch64 => 3 * @sizeOf(u32), |
| 5669 | | else => unreachable, |
| 5670 | | }; |
| 5671 | | const off: u4 = switch (self.base.options.target.cpu.arch) { |
| 4516 | const seg = self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 4517 | const sect = seg.sections.items[self.stub_helper_section_index.?]; |
| 4518 | const stub_offset: u4 = switch (self.base.options.target.cpu.arch) { |
| 5672 | 4519 | .x86_64 => 1, |
| 5673 | 4520 | .aarch64 => 2 * @sizeOf(u32), |
| 5674 | 4521 | else => unreachable, |
| 5675 | 4522 | }; |
| 5676 | 4523 | var buf: [@sizeOf(u32)]u8 = undefined; |
| 5677 | | for (self.stubs.items) |_, index| { |
| 5678 | | const placeholder_off = self.stub_helper_stubs_start_off.? + index * stub_size + off; |
| 5679 | | mem.writeIntLittle(u32, &buf, offsets.items[index]); |
| 5680 | | try self.base.file.?.pwriteAll(&buf, placeholder_off); |
| 4524 | _ = offsets.pop(); |
| 4525 | while (offsets.popOrNull()) |bind_offset| { |
| 4526 | const sym = self.locals.items[atom.local_sym_index]; |
| 4527 | const file_offset = sect.offset + sym.n_value - sect.addr + stub_offset; |
| 4528 | mem.writeIntLittle(u32, &buf, bind_offset); |
| 4529 | log.debug("writing lazy bind offset in stub helper of 0x{x} for symbol {s} at offset 0x{x}", .{ |
| 4530 | bind_offset, |
| 4531 | self.getString(sym.n_strx), |
| 4532 | file_offset, |
| 4533 | }); |
| 4534 | try self.base.file.?.pwriteAll(&buf, file_offset); |
| 4535 | |
| 4536 | if (atom.next) |next| { |
| 4537 | atom = next; |
| 4538 | } else break; |
| 5681 | 4539 | } |
| 5682 | 4540 | } |
| 5683 | 4541 | |
| 5684 | | fn writeStringTable(self: *MachO) !void { |
| 5685 | | if (!self.strtab_dirty) return; |
| 4542 | fn writeDices(self: *MachO) !void { |
| 4543 | if (!self.has_dices) return; |
| 4544 | |
| 4545 | const tracy = trace(@src()); |
| 4546 | defer tracy.end(); |
| 4547 | |
| 4548 | var buf = std.ArrayList(u8).init(self.base.allocator); |
| 4549 | defer buf.deinit(); |
| 4550 | |
| 4551 | var atom: *Atom = self.atoms.get(.{ |
| 4552 | .seg = self.text_segment_cmd_index orelse return, |
| 4553 | .sect = self.text_section_index orelse return, |
| 4554 | }) orelse return; |
| 4555 | |
| 4556 | while (atom.prev) |prev| { |
| 4557 | atom = prev; |
| 4558 | } |
| 4559 | |
| 4560 | const text_seg = self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 4561 | const text_sect = text_seg.sections.items[self.text_section_index.?]; |
| 4562 | |
| 4563 | while (true) { |
| 4564 | if (atom.dices.items.len > 0) { |
| 4565 | const sym = self.locals.items[atom.local_sym_index]; |
| 4566 | const base_off = try math.cast(u32, sym.n_value - text_sect.addr + text_sect.offset); |
| 4567 | |
| 4568 | try buf.ensureUnusedCapacity(atom.dices.items.len * @sizeOf(macho.data_in_code_entry)); |
| 4569 | for (atom.dices.items) |dice| { |
| 4570 | const rebased_dice = macho.data_in_code_entry{ |
| 4571 | .offset = base_off + dice.offset, |
| 4572 | .length = dice.length, |
| 4573 | .kind = dice.kind, |
| 4574 | }; |
| 4575 | buf.appendSliceAssumeCapacity(mem.asBytes(&rebased_dice)); |
| 4576 | } |
| 4577 | } |
| 4578 | |
| 4579 | if (atom.next) |next| { |
| 4580 | atom = next; |
| 4581 | } else break; |
| 4582 | } |
| 4583 | |
| 4584 | const seg = &self.load_commands.items[self.linkedit_segment_cmd_index.?].Segment; |
| 4585 | const dice_cmd = &self.load_commands.items[self.data_in_code_cmd_index.?].LinkeditData; |
| 4586 | const needed_size = @intCast(u32, buf.items.len); |
| 5686 | 4587 | |
| 4588 | dice_cmd.dataoff = @intCast(u32, seg.inner.fileoff + seg.inner.filesize); |
| 4589 | dice_cmd.datasize = needed_size; |
| 4590 | seg.inner.filesize += needed_size; |
| 4591 | |
| 4592 | log.debug("writing data-in-code from 0x{x} to 0x{x}", .{ |
| 4593 | dice_cmd.dataoff, |
| 4594 | dice_cmd.dataoff + dice_cmd.datasize, |
| 4595 | }); |
| 4596 | |
| 4597 | try self.base.file.?.pwriteAll(buf.items, dice_cmd.dataoff); |
| 4598 | self.load_commands_dirty = true; |
| 4599 | } |
| 4600 | |
| 4601 | fn writeSymbolTable(self: *MachO) !void { |
| 5687 | 4602 | const tracy = trace(@src()); |
| 5688 | 4603 | defer tracy.end(); |
| 5689 | 4604 | |
| 4605 | const seg = &self.load_commands.items[self.linkedit_segment_cmd_index.?].Segment; |
| 5690 | 4606 | const symtab = &self.load_commands.items[self.symtab_cmd_index.?].Symtab; |
| 5691 | | const allocated_size = self.allocatedSizeLinkedit(symtab.stroff); |
| 5692 | | const needed_size = mem.alignForwardGeneric(u64, self.strtab.items.len, @alignOf(u64)); |
| 4607 | symtab.symoff = @intCast(u32, seg.inner.fileoff + seg.inner.filesize); |
| 4608 | |
| 4609 | var locals = std.ArrayList(macho.nlist_64).init(self.base.allocator); |
| 4610 | defer locals.deinit(); |
| 4611 | try locals.appendSlice(self.locals.items); |
| 4612 | |
| 4613 | if (self.has_stabs) { |
| 4614 | for (self.objects.items) |object| { |
| 4615 | if (object.debug_info == null) continue; |
| 4616 | |
| 4617 | // Open scope |
| 4618 | try locals.ensureUnusedCapacity(3); |
| 4619 | locals.appendAssumeCapacity(.{ |
| 4620 | .n_strx = try self.makeString(object.tu_comp_dir.?), |
| 4621 | .n_type = macho.N_SO, |
| 4622 | .n_sect = 0, |
| 4623 | .n_desc = 0, |
| 4624 | .n_value = 0, |
| 4625 | }); |
| 4626 | locals.appendAssumeCapacity(.{ |
| 4627 | .n_strx = try self.makeString(object.tu_name.?), |
| 4628 | .n_type = macho.N_SO, |
| 4629 | .n_sect = 0, |
| 4630 | .n_desc = 0, |
| 4631 | .n_value = 0, |
| 4632 | }); |
| 4633 | locals.appendAssumeCapacity(.{ |
| 4634 | .n_strx = try self.makeString(object.name), |
| 4635 | .n_type = macho.N_OSO, |
| 4636 | .n_sect = 0, |
| 4637 | .n_desc = 1, |
| 4638 | .n_value = object.mtime orelse 0, |
| 4639 | }); |
| 4640 | |
| 4641 | for (object.atoms.items) |atom| { |
| 4642 | if (atom.stab) |stab| { |
| 4643 | const nlists = try stab.asNlists(atom.local_sym_index, self); |
| 4644 | defer self.base.allocator.free(nlists); |
| 4645 | try locals.appendSlice(nlists); |
| 4646 | } else { |
| 4647 | for (atom.contained.items) |sym_at_off| { |
| 4648 | const stab = sym_at_off.stab orelse continue; |
| 4649 | const nlists = try stab.asNlists(sym_at_off.local_sym_index, self); |
| 4650 | defer self.base.allocator.free(nlists); |
| 4651 | try locals.appendSlice(nlists); |
| 4652 | } |
| 4653 | } |
| 4654 | } |
| 5693 | 4655 | |
| 5694 | | if (needed_size > allocated_size or self.strtab_needs_relocation) { |
| 5695 | | symtab.strsize = 0; |
| 5696 | | symtab.stroff = @intCast(u32, self.findFreeSpaceLinkedit(needed_size, 1, symtab.symoff)); |
| 5697 | | self.strtab_needs_relocation = false; |
| 4656 | // Close scope |
| 4657 | try locals.append(.{ |
| 4658 | .n_strx = 0, |
| 4659 | .n_type = macho.N_SO, |
| 4660 | .n_sect = 0, |
| 4661 | .n_desc = 0, |
| 4662 | .n_value = 0, |
| 4663 | }); |
| 4664 | } |
| 5698 | 4665 | } |
| 5699 | | symtab.strsize = @intCast(u32, needed_size); |
| 5700 | | log.debug("writing string table from 0x{x} to 0x{x}", .{ symtab.stroff, symtab.stroff + symtab.strsize }); |
| 5701 | 4666 | |
| 5702 | | try self.base.file.?.pwriteAll(self.strtab.items, symtab.stroff); |
| 4667 | const nlocals = locals.items.len; |
| 4668 | const nexports = self.globals.items.len; |
| 4669 | const nundefs = self.undefs.items.len; |
| 4670 | |
| 4671 | const locals_off = symtab.symoff; |
| 4672 | const locals_size = nlocals * @sizeOf(macho.nlist_64); |
| 4673 | log.debug("writing local symbols from 0x{x} to 0x{x}", .{ locals_off, locals_size + locals_off }); |
| 4674 | try self.base.file.?.pwriteAll(mem.sliceAsBytes(locals.items), locals_off); |
| 4675 | |
| 4676 | const exports_off = locals_off + locals_size; |
| 4677 | const exports_size = nexports * @sizeOf(macho.nlist_64); |
| 4678 | log.debug("writing exported symbols from 0x{x} to 0x{x}", .{ exports_off, exports_size + exports_off }); |
| 4679 | try self.base.file.?.pwriteAll(mem.sliceAsBytes(self.globals.items), exports_off); |
| 4680 | |
| 4681 | const undefs_off = exports_off + exports_size; |
| 4682 | const undefs_size = nundefs * @sizeOf(macho.nlist_64); |
| 4683 | log.debug("writing undefined symbols from 0x{x} to 0x{x}", .{ undefs_off, undefs_size + undefs_off }); |
| 4684 | try self.base.file.?.pwriteAll(mem.sliceAsBytes(self.undefs.items), undefs_off); |
| 4685 | |
| 4686 | symtab.nsyms = @intCast(u32, nlocals + nexports + nundefs); |
| 4687 | seg.inner.filesize += locals_size + exports_size + undefs_size; |
| 4688 | |
| 4689 | // Update dynamic symbol table. |
| 4690 | const dysymtab = &self.load_commands.items[self.dysymtab_cmd_index.?].Dysymtab; |
| 4691 | dysymtab.nlocalsym = @intCast(u32, nlocals); |
| 4692 | dysymtab.iextdefsym = dysymtab.nlocalsym; |
| 4693 | dysymtab.nextdefsym = @intCast(u32, nexports); |
| 4694 | dysymtab.iundefsym = dysymtab.nlocalsym + dysymtab.nextdefsym; |
| 4695 | dysymtab.nundefsym = @intCast(u32, nundefs); |
| 4696 | |
| 4697 | const text_segment = &self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 4698 | const stubs = &text_segment.sections.items[self.stubs_section_index.?]; |
| 4699 | const data_const_segment = &self.load_commands.items[self.data_const_segment_cmd_index.?].Segment; |
| 4700 | const got = &data_const_segment.sections.items[self.got_section_index.?]; |
| 4701 | const data_segment = &self.load_commands.items[self.data_segment_cmd_index.?].Segment; |
| 4702 | const la_symbol_ptr = &data_segment.sections.items[self.la_symbol_ptr_section_index.?]; |
| 4703 | |
| 4704 | const nstubs = @intCast(u32, self.stubs_map.keys().len); |
| 4705 | const ngot_entries = @intCast(u32, self.got_entries_map.keys().len); |
| 4706 | |
| 4707 | dysymtab.indirectsymoff = @intCast(u32, seg.inner.fileoff + seg.inner.filesize); |
| 4708 | dysymtab.nindirectsyms = nstubs * 2 + ngot_entries; |
| 4709 | |
| 4710 | const needed_size = dysymtab.nindirectsyms * @sizeOf(u32); |
| 4711 | seg.inner.filesize += needed_size; |
| 4712 | |
| 4713 | log.debug("writing indirect symbol table from 0x{x} to 0x{x}", .{ |
| 4714 | dysymtab.indirectsymoff, |
| 4715 | dysymtab.indirectsymoff + needed_size, |
| 4716 | }); |
| 4717 | |
| 4718 | var buf = try self.base.allocator.alloc(u8, needed_size); |
| 4719 | defer self.base.allocator.free(buf); |
| 4720 | |
| 4721 | var stream = std.io.fixedBufferStream(buf); |
| 4722 | var writer = stream.writer(); |
| 4723 | |
| 4724 | stubs.reserved1 = 0; |
| 4725 | for (self.stubs_map.keys()) |key| { |
| 4726 | try writer.writeIntLittle(u32, dysymtab.iundefsym + key); |
| 4727 | } |
| 4728 | |
| 4729 | got.reserved1 = nstubs; |
| 4730 | for (self.got_entries_map.keys()) |key| { |
| 4731 | switch (key.where) { |
| 4732 | .undef => { |
| 4733 | try writer.writeIntLittle(u32, dysymtab.iundefsym + key.where_index); |
| 4734 | }, |
| 4735 | .local => { |
| 4736 | try writer.writeIntLittle(u32, macho.INDIRECT_SYMBOL_LOCAL); |
| 4737 | }, |
| 4738 | } |
| 4739 | } |
| 4740 | |
| 4741 | la_symbol_ptr.reserved1 = got.reserved1 + ngot_entries; |
| 4742 | for (self.stubs_map.keys()) |key| { |
| 4743 | try writer.writeIntLittle(u32, dysymtab.iundefsym + key); |
| 4744 | } |
| 4745 | |
| 4746 | try self.base.file.?.pwriteAll(buf, dysymtab.indirectsymoff); |
| 5703 | 4747 | self.load_commands_dirty = true; |
| 5704 | | self.strtab_dirty = false; |
| 5705 | 4748 | } |
| 5706 | 4749 | |
| 5707 | | fn writeStringTableZld(self: *MachO) !void { |
| 4750 | fn writeStringTable(self: *MachO) !void { |
| 4751 | const tracy = trace(@src()); |
| 4752 | defer tracy.end(); |
| 4753 | |
| 5708 | 4754 | const seg = &self.load_commands.items[self.linkedit_segment_cmd_index.?].Segment; |
| 5709 | 4755 | const symtab = &self.load_commands.items[self.symtab_cmd_index.?].Symtab; |
| 5710 | 4756 | symtab.stroff = @intCast(u32, seg.inner.fileoff + seg.inner.filesize); |
| ... | ... | @@ -5719,55 +4765,81 @@ fn writeStringTableZld(self: *MachO) !void { |
| 5719 | 4765 | // This is potentially the last section, so we need to pad it out. |
| 5720 | 4766 | try self.base.file.?.pwriteAll(&[_]u8{0}, seg.inner.fileoff + seg.inner.filesize - 1); |
| 5721 | 4767 | } |
| 4768 | self.load_commands_dirty = true; |
| 5722 | 4769 | } |
| 5723 | 4770 | |
| 5724 | | fn updateLinkeditSegmentSizes(self: *MachO) !void { |
| 5725 | | if (!self.load_commands_dirty) return; |
| 4771 | fn writeLinkeditSegment(self: *MachO) !void { |
| 4772 | const tracy = trace(@src()); |
| 4773 | defer tracy.end(); |
| 4774 | |
| 4775 | const seg = &self.load_commands.items[self.linkedit_segment_cmd_index.?].Segment; |
| 4776 | seg.inner.filesize = 0; |
| 4777 | |
| 4778 | try self.writeDyldInfoData(); |
| 4779 | try self.writeDices(); |
| 4780 | try self.writeSymbolTable(); |
| 4781 | try self.writeStringTable(); |
| 4782 | |
| 4783 | seg.inner.vmsize = mem.alignForwardGeneric(u64, seg.inner.filesize, self.page_size); |
| 4784 | } |
| 5726 | 4785 | |
| 4786 | fn writeCodeSignaturePadding(self: *MachO) !void { |
| 5727 | 4787 | const tracy = trace(@src()); |
| 5728 | 4788 | defer tracy.end(); |
| 5729 | 4789 | |
| 5730 | | // Now, we are in position to update __LINKEDIT segment sizes. |
| 5731 | | // TODO Add checkpointing so that we don't have to do this every single time. |
| 5732 | 4790 | const linkedit_segment = &self.load_commands.items[self.linkedit_segment_cmd_index.?].Segment; |
| 5733 | | var final_offset = linkedit_segment.inner.fileoff; |
| 5734 | | |
| 5735 | | if (self.dyld_info_cmd_index) |idx| { |
| 5736 | | const dyld_info = self.load_commands.items[idx].DyldInfoOnly; |
| 5737 | | final_offset = std.math.max(final_offset, dyld_info.rebase_off + dyld_info.rebase_size); |
| 5738 | | final_offset = std.math.max(final_offset, dyld_info.bind_off + dyld_info.bind_size); |
| 5739 | | final_offset = std.math.max(final_offset, dyld_info.weak_bind_off + dyld_info.weak_bind_size); |
| 5740 | | final_offset = std.math.max(final_offset, dyld_info.lazy_bind_off + dyld_info.lazy_bind_size); |
| 5741 | | final_offset = std.math.max(final_offset, dyld_info.export_off + dyld_info.export_size); |
| 5742 | | } |
| 5743 | | if (self.function_starts_cmd_index) |idx| { |
| 5744 | | const fstart = self.load_commands.items[idx].LinkeditData; |
| 5745 | | final_offset = std.math.max(final_offset, fstart.dataoff + fstart.datasize); |
| 5746 | | } |
| 5747 | | if (self.data_in_code_cmd_index) |idx| { |
| 5748 | | const dic = self.load_commands.items[idx].LinkeditData; |
| 5749 | | final_offset = std.math.max(final_offset, dic.dataoff + dic.datasize); |
| 5750 | | } |
| 5751 | | if (self.dysymtab_cmd_index) |idx| { |
| 5752 | | const dysymtab = self.load_commands.items[idx].Dysymtab; |
| 5753 | | const nindirectsize = dysymtab.nindirectsyms * @sizeOf(u32); |
| 5754 | | final_offset = std.math.max(final_offset, dysymtab.indirectsymoff + nindirectsize); |
| 5755 | | // TODO Handle more dynamic symbol table sections. |
| 5756 | | } |
| 5757 | | if (self.symtab_cmd_index) |idx| { |
| 5758 | | const symtab = self.load_commands.items[idx].Symtab; |
| 5759 | | const symsize = symtab.nsyms * @sizeOf(macho.nlist_64); |
| 5760 | | final_offset = std.math.max(final_offset, symtab.symoff + symsize); |
| 5761 | | final_offset = std.math.max(final_offset, symtab.stroff + symtab.strsize); |
| 5762 | | } |
| 5763 | | |
| 5764 | | const filesize = final_offset - linkedit_segment.inner.fileoff; |
| 5765 | | linkedit_segment.inner.filesize = filesize; |
| 5766 | | linkedit_segment.inner.vmsize = mem.alignForwardGeneric(u64, filesize, self.page_size); |
| 5767 | | try self.base.file.?.pwriteAll(&[_]u8{0}, final_offset); |
| 4791 | const code_sig_cmd = &self.load_commands.items[self.code_signature_cmd_index.?].LinkeditData; |
| 4792 | const fileoff = linkedit_segment.inner.fileoff + linkedit_segment.inner.filesize; |
| 4793 | const needed_size = CodeSignature.calcCodeSignaturePaddingSize( |
| 4794 | self.base.options.emit.?.sub_path, |
| 4795 | fileoff, |
| 4796 | self.page_size, |
| 4797 | ); |
| 4798 | code_sig_cmd.dataoff = @intCast(u32, fileoff); |
| 4799 | code_sig_cmd.datasize = needed_size; |
| 4800 | |
| 4801 | // Advance size of __LINKEDIT segment |
| 4802 | linkedit_segment.inner.filesize += needed_size; |
| 4803 | if (linkedit_segment.inner.vmsize < linkedit_segment.inner.filesize) { |
| 4804 | linkedit_segment.inner.vmsize = mem.alignForwardGeneric(u64, linkedit_segment.inner.filesize, self.page_size); |
| 4805 | } |
| 4806 | log.debug("writing code signature padding from 0x{x} to 0x{x}", .{ fileoff, fileoff + needed_size }); |
| 4807 | // Pad out the space. We need to do this to calculate valid hashes for everything in the file |
| 4808 | // except for code signature data. |
| 4809 | try self.base.file.?.pwriteAll(&[_]u8{0}, fileoff + needed_size - 1); |
| 5768 | 4810 | self.load_commands_dirty = true; |
| 5769 | 4811 | } |
| 5770 | 4812 | |
| 4813 | fn writeCodeSignature(self: *MachO) !void { |
| 4814 | const tracy = trace(@src()); |
| 4815 | defer tracy.end(); |
| 4816 | |
| 4817 | const text_segment = self.load_commands.items[self.text_segment_cmd_index.?].Segment; |
| 4818 | const code_sig_cmd = self.load_commands.items[self.code_signature_cmd_index.?].LinkeditData; |
| 4819 | |
| 4820 | var code_sig: CodeSignature = .{}; |
| 4821 | defer code_sig.deinit(self.base.allocator); |
| 4822 | |
| 4823 | try code_sig.calcAdhocSignature( |
| 4824 | self.base.allocator, |
| 4825 | self.base.file.?, |
| 4826 | self.base.options.emit.?.sub_path, |
| 4827 | text_segment.inner, |
| 4828 | code_sig_cmd, |
| 4829 | self.base.options.output_mode, |
| 4830 | self.page_size, |
| 4831 | ); |
| 4832 | |
| 4833 | var buffer = try self.base.allocator.alloc(u8, code_sig.size()); |
| 4834 | defer self.base.allocator.free(buffer); |
| 4835 | var stream = std.io.fixedBufferStream(buffer); |
| 4836 | try code_sig.write(stream.writer()); |
| 4837 | |
| 4838 | log.debug("writing code signature from 0x{x} to 0x{x}", .{ code_sig_cmd.dataoff, code_sig_cmd.dataoff + buffer.len }); |
| 4839 | |
| 4840 | try self.base.file.?.pwriteAll(buffer, code_sig_cmd.dataoff); |
| 4841 | } |
| 4842 | |
| 5771 | 4843 | /// Writes all load commands and section headers. |
| 5772 | 4844 | fn writeLoadCommands(self: *MachO) !void { |
| 5773 | 4845 | if (!self.load_commands_dirty) return; |
| ... | ... | @@ -5844,6 +4916,13 @@ pub fn padToIdeal(actual_size: anytype) @TypeOf(actual_size) { |
| 5844 | 4916 | std.math.maxInt(@TypeOf(actual_size)); |
| 5845 | 4917 | } |
| 5846 | 4918 | |
| 4919 | pub fn makeStaticString(bytes: []const u8) [16]u8 { |
| 4920 | var buf = [_]u8{0} ** 16; |
| 4921 | assert(bytes.len <= buf.len); |
| 4922 | mem.copy(u8, &buf, bytes); |
| 4923 | return buf; |
| 4924 | } |
| 4925 | |
| 5847 | 4926 | pub fn makeString(self: *MachO, string: []const u8) !u32 { |
| 5848 | 4927 | const gop = try self.strtab_dir.getOrPutContextAdapted(self.base.allocator, @as([]const u8, string), StringIndexAdapter{ |
| 5849 | 4928 | .bytes = &self.strtab, |
Jakub Konka <kubkon@jakubkonka.com> 2021-09-14 14:20:11+02:00
GitHub <noreply@github.com> 2021-09-14 14:20:11+02:00
Signed by PGP key 4AEE18F83AFDEB23
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