| ... | ... | @@ -205,6 +205,7 @@ const AbbrevAttr = struct { |
| 205 | 205 | |
| 206 | 206 | const FormValue = union(enum) { |
| 207 | 207 | Address: u64, |
| 208 | AddrOffset: u64, |
| 208 | 209 | Block: []u8, |
| 209 | 210 | Const: Constant, |
| 210 | 211 | ExprLoc: []u8, |
| ... | ... | @@ -216,14 +217,35 @@ const FormValue = union(enum) { |
| 216 | 217 | StrPtr: u64, |
| 217 | 218 | StrOffset: u64, |
| 218 | 219 | LineStrPtr: u64, |
| 220 | LocListOffset: u64, |
| 221 | RangeListOffset: u64, |
| 222 | |
| 223 | fn getString(fv: FormValue, di: DwarfInfo) ![]const u8 { |
| 224 | switch (fv) { |
| 225 | .String => |s| return s, |
| 226 | .StrPtr => |off| return di.getString(off), |
| 227 | .LineStrPtr => |off| return di.getLineString(off), |
| 228 | else => return badDwarf(), |
| 229 | } |
| 230 | } |
| 231 | |
| 232 | fn getUInt(fv: FormValue, comptime U: type) !U { |
| 233 | switch (fv) { |
| 234 | .Const => |c| { |
| 235 | const int = try c.asUnsignedLe(); |
| 236 | return math.cast(U, int) orelse return badDwarf(); |
| 237 | }, |
| 238 | else => return badDwarf(), |
| 239 | } |
| 240 | } |
| 219 | 241 | }; |
| 220 | 242 | |
| 221 | 243 | const Constant = struct { |
| 222 | 244 | payload: u64, |
| 223 | 245 | signed: bool, |
| 224 | 246 | |
| 225 | | fn asUnsignedLe(self: *const Constant) !u64 { |
| 226 | | if (self.signed) return error.InvalidDebugInfo; |
| 247 | fn asUnsignedLe(self: Constant) !u64 { |
| 248 | if (self.signed) return badDwarf(); |
| 227 | 249 | return self.payload; |
| 228 | 250 | } |
| 229 | 251 | }; |
| ... | ... | @@ -252,16 +274,57 @@ const Die = struct { |
| 252 | 274 | return null; |
| 253 | 275 | } |
| 254 | 276 | |
| 255 | | fn getAttrAddr(self: *const Die, id: u64) !u64 { |
| 256 | | const form_value = self.getAttr(id) orelse return error.MissingDebugInfo; |
| 277 | fn getAttrAddr(self: *const Die, di: *DwarfInfo, id: u64) error{ InvalidDebugInfo, MissingDebugInfo }!u64 { |
| 278 | const form_value = self.getAttr(id) orelse return missingDwarf(); |
| 257 | 279 | return switch (form_value.*) { |
| 258 | 280 | FormValue.Address => |value| value, |
| 281 | FormValue.AddrOffset => |index| { |
| 282 | const debug_addr = di.debug_addr orelse return badDwarf(); |
| 283 | if (debug_addr.len < 8) return badDwarf(); |
| 284 | const first_32_bits = mem.readInt(u32, debug_addr[0..4], di.endian); |
| 285 | const is_64 = first_32_bits == 0xffffffff; |
| 286 | var off: usize = undefined; |
| 287 | const length: u64 = l: { |
| 288 | if (is_64) { |
| 289 | if (debug_addr.len < 16) return badDwarf(); |
| 290 | off = 12; |
| 291 | break :l mem.readInt(u64, debug_addr[4..12], di.endian); |
| 292 | } else { |
| 293 | if (debug_addr.len < 8) return badDwarf(); |
| 294 | if (first_32_bits >= 0xfffffff0) return badDwarf(); |
| 295 | off = 4; |
| 296 | break :l first_32_bits; |
| 297 | } |
| 298 | }; |
| 299 | if (index > length) return badDwarf(); |
| 300 | |
| 301 | const version = mem.readInt(u16, debug_addr[off..][0..2], di.endian); |
| 302 | off += 2; |
| 303 | if (version < 5) return badDwarf(); |
| 304 | |
| 305 | const addr_size = debug_addr[off]; |
| 306 | off += 1; |
| 307 | |
| 308 | const seg_size = debug_addr[off]; |
| 309 | off += 1; |
| 310 | |
| 311 | const base_offset = self.getAttrSecOffset(AT.addr_base) catch off; |
| 312 | const byte_offset = base_offset + (addr_size + seg_size) * index; |
| 313 | if (byte_offset + addr_size > debug_addr.len) return badDwarf(); |
| 314 | switch (addr_size) { |
| 315 | 1 => return debug_addr[byte_offset], |
| 316 | 2 => return mem.readInt(u16, debug_addr[byte_offset..][0..2], di.endian), |
| 317 | 4 => return mem.readInt(u32, debug_addr[byte_offset..][0..4], di.endian), |
| 318 | 8 => return mem.readInt(u64, debug_addr[byte_offset..][0..8], di.endian), |
| 319 | else => return badDwarf(), |
| 320 | } |
| 321 | }, |
| 259 | 322 | else => error.InvalidDebugInfo, |
| 260 | 323 | }; |
| 261 | 324 | } |
| 262 | 325 | |
| 263 | 326 | fn getAttrSecOffset(self: *const Die, id: u64) !u64 { |
| 264 | | const form_value = self.getAttr(id) orelse return error.MissingDebugInfo; |
| 327 | const form_value = self.getAttr(id) orelse return missingDwarf(); |
| 265 | 328 | return switch (form_value.*) { |
| 266 | 329 | FormValue.Const => |value| value.asUnsignedLe(), |
| 267 | 330 | FormValue.SecOffset => |value| value, |
| ... | ... | @@ -270,7 +333,7 @@ const Die = struct { |
| 270 | 333 | } |
| 271 | 334 | |
| 272 | 335 | fn getAttrUnsignedLe(self: *const Die, id: u64) !u64 { |
| 273 | | const form_value = self.getAttr(id) orelse return error.MissingDebugInfo; |
| 336 | const form_value = self.getAttr(id) orelse return missingDwarf(); |
| 274 | 337 | return switch (form_value.*) { |
| 275 | 338 | FormValue.Const => |value| value.asUnsignedLe(), |
| 276 | 339 | else => error.InvalidDebugInfo, |
| ... | ... | @@ -278,33 +341,67 @@ const Die = struct { |
| 278 | 341 | } |
| 279 | 342 | |
| 280 | 343 | fn getAttrRef(self: *const Die, id: u64) !u64 { |
| 281 | | const form_value = self.getAttr(id) orelse return error.MissingDebugInfo; |
| 344 | const form_value = self.getAttr(id) orelse return missingDwarf(); |
| 282 | 345 | return switch (form_value.*) { |
| 283 | 346 | FormValue.Ref => |value| value, |
| 284 | 347 | else => error.InvalidDebugInfo, |
| 285 | 348 | }; |
| 286 | 349 | } |
| 287 | 350 | |
| 288 | | pub fn getAttrString(self: *const Die, di: *DwarfInfo, id: u64, is_64: bool) ![]const u8 { |
| 289 | | const form_value = self.getAttr(id) orelse return error.MissingDebugInfo; |
| 290 | | return switch (form_value.*) { |
| 291 | | FormValue.String => |value| value, |
| 292 | | FormValue.StrPtr => |offset| di.getString(offset), |
| 293 | | FormValue.StrOffset => |index| blk: { |
| 294 | | const base_offset = self.getAttrSecOffset(AT.str_offsets_base) catch 0; |
| 295 | | break :blk di.getLineString(try di.getStringOffset(base_offset + index, is_64)); |
| 351 | pub fn getAttrString(self: *const Die, di: *DwarfInfo, id: u64, opt_str: ?[]const u8) error{ InvalidDebugInfo, MissingDebugInfo }![]const u8 { |
| 352 | const form_value = self.getAttr(id) orelse return missingDwarf(); |
| 353 | switch (form_value.*) { |
| 354 | FormValue.String => |value| return value, |
| 355 | FormValue.StrPtr => |offset| return di.getString(offset), |
| 356 | FormValue.StrOffset => |index| { |
| 357 | const debug_str_offsets = di.debug_str_offsets orelse return badDwarf(); |
| 358 | if (debug_str_offsets.len < 8) return badDwarf(); |
| 359 | const first_32_bits = mem.readInt(u32, debug_str_offsets[0..4], di.endian); |
| 360 | const is_64 = first_32_bits == 0xffffffff; |
| 361 | var off: usize = undefined; |
| 362 | const length: u64 = l: { |
| 363 | if (is_64) { |
| 364 | if (debug_str_offsets.len < 16) return badDwarf(); |
| 365 | off = 12; |
| 366 | break :l mem.readInt(u64, debug_str_offsets[4..12], di.endian); |
| 367 | } else { |
| 368 | if (debug_str_offsets.len < 8) return badDwarf(); |
| 369 | if (first_32_bits >= 0xfffffff0) return badDwarf(); |
| 370 | off = 4; |
| 371 | break :l first_32_bits; |
| 372 | } |
| 373 | }; |
| 374 | if (index > length) return badDwarf(); |
| 375 | |
| 376 | const version = mem.readInt(u16, debug_str_offsets[off..][0..2], di.endian); |
| 377 | off += 2; |
| 378 | if (version < 5) return badDwarf(); |
| 379 | |
| 380 | off += 2; // reserved |
| 381 | |
| 382 | const base_offset = self.getAttrSecOffset(AT.str_offsets_base) catch off; |
| 383 | if (is_64) { |
| 384 | const byte_offset = base_offset + 8 * index; |
| 385 | const offset = mem.readInt(u64, debug_str_offsets[byte_offset..][0..8], di.endian); |
| 386 | return getStringGeneric(opt_str, offset); |
| 387 | } else { |
| 388 | const byte_offset = base_offset + 4 * index; |
| 389 | const offset = mem.readInt(u32, debug_str_offsets[byte_offset..][0..4], di.endian); |
| 390 | return getStringGeneric(opt_str, offset); |
| 391 | } |
| 296 | 392 | }, |
| 297 | | FormValue.LineStrPtr => |offset| di.getLineString(offset), |
| 298 | | else => error.InvalidDebugInfo, |
| 299 | | }; |
| 393 | FormValue.LineStrPtr => |offset| return di.getLineString(offset), |
| 394 | else => return badDwarf(), |
| 395 | } |
| 300 | 396 | } |
| 301 | 397 | }; |
| 302 | 398 | |
| 303 | 399 | const FileEntry = struct { |
| 304 | | file_name: []const u8, |
| 305 | | dir_index: usize, |
| 306 | | mtime: usize, |
| 307 | | len_bytes: usize, |
| 400 | path: []const u8, |
| 401 | dir_index: u32 = 0, |
| 402 | mtime: u64 = 0, |
| 403 | size: u64 = 0, |
| 404 | md5: u128 = 0, |
| 308 | 405 | }; |
| 309 | 406 | |
| 310 | 407 | const LineNumberProgram = struct { |
| ... | ... | @@ -312,13 +409,14 @@ const LineNumberProgram = struct { |
| 312 | 409 | file: usize, |
| 313 | 410 | line: i64, |
| 314 | 411 | column: u64, |
| 412 | version: u16, |
| 315 | 413 | is_stmt: bool, |
| 316 | 414 | basic_block: bool, |
| 317 | 415 | end_sequence: bool, |
| 318 | 416 | |
| 319 | 417 | default_is_stmt: bool, |
| 320 | 418 | target_address: u64, |
| 321 | | include_dirs: []const []const u8, |
| 419 | include_dirs: []const FileEntry, |
| 322 | 420 | |
| 323 | 421 | prev_valid: bool, |
| 324 | 422 | prev_address: u64, |
| ... | ... | @@ -349,12 +447,18 @@ const LineNumberProgram = struct { |
| 349 | 447 | self.prev_end_sequence = undefined; |
| 350 | 448 | } |
| 351 | 449 | |
| 352 | | pub fn init(is_stmt: bool, include_dirs: []const []const u8, target_address: u64) LineNumberProgram { |
| 450 | pub fn init( |
| 451 | is_stmt: bool, |
| 452 | include_dirs: []const FileEntry, |
| 453 | target_address: u64, |
| 454 | version: u16, |
| 455 | ) LineNumberProgram { |
| 353 | 456 | return LineNumberProgram{ |
| 354 | 457 | .address = 0, |
| 355 | 458 | .file = 1, |
| 356 | 459 | .line = 1, |
| 357 | 460 | .column = 0, |
| 461 | .version = version, |
| 358 | 462 | .is_stmt = is_stmt, |
| 359 | 463 | .basic_block = false, |
| 360 | 464 | .end_sequence = false, |
| ... | ... | @@ -377,18 +481,24 @@ const LineNumberProgram = struct { |
| 377 | 481 | allocator: mem.Allocator, |
| 378 | 482 | file_entries: []const FileEntry, |
| 379 | 483 | ) !?debug.LineInfo { |
| 380 | | if (self.prev_valid and self.target_address >= self.prev_address and self.target_address < self.address) { |
| 381 | | const file_entry = if (self.prev_file == 0) { |
| 382 | | return error.MissingDebugInfo; |
| 383 | | } else if (self.prev_file - 1 >= file_entries.len) { |
| 384 | | return error.InvalidDebugInfo; |
| 385 | | } else &file_entries[self.prev_file - 1]; |
| 484 | if (self.prev_valid and |
| 485 | self.target_address >= self.prev_address and |
| 486 | self.target_address < self.address) |
| 487 | { |
| 488 | const file_index = if (self.version >= 5) self.prev_file else i: { |
| 489 | if (self.prev_file == 0) return missingDwarf(); |
| 490 | break :i self.prev_file - 1; |
| 491 | }; |
| 386 | 492 | |
| 387 | | const dir_name = if (file_entry.dir_index >= self.include_dirs.len) { |
| 388 | | return error.InvalidDebugInfo; |
| 389 | | } else self.include_dirs[file_entry.dir_index]; |
| 493 | if (file_index >= file_entries.len) return badDwarf(); |
| 494 | const file_entry = &file_entries[file_index]; |
| 390 | 495 | |
| 391 | | const file_name = try fs.path.join(allocator, &[_][]const u8{ dir_name, file_entry.file_name }); |
| 496 | if (file_entry.dir_index >= self.include_dirs.len) return badDwarf(); |
| 497 | const dir_name = self.include_dirs[file_entry.dir_index].path; |
| 498 | |
| 499 | const file_name = try fs.path.join(allocator, &[_][]const u8{ |
| 500 | dir_name, file_entry.path, |
| 501 | }); |
| 392 | 502 | |
| 393 | 503 | return debug.LineInfo{ |
| 394 | 504 | .line = if (self.prev_line >= 0) @intCast(u64, self.prev_line) else 0, |
| ... | ... | @@ -415,7 +525,7 @@ fn readUnitLength(in_stream: anytype, endian: std.builtin.Endian, is_64: *bool) |
| 415 | 525 | if (is_64.*) { |
| 416 | 526 | return in_stream.readInt(u64, endian); |
| 417 | 527 | } else { |
| 418 | | if (first_32_bits >= 0xfffffff0) return error.InvalidDebugInfo; |
| 528 | if (first_32_bits >= 0xfffffff0) return badDwarf(); |
| 419 | 529 | // TODO this cast should not be needed |
| 420 | 530 | return @as(u64, first_32_bits); |
| 421 | 531 | } |
| ... | ... | @@ -492,6 +602,12 @@ fn parseFormValueRef(in_stream: anytype, endian: std.builtin.Endian, size: i32) |
| 492 | 602 | fn parseFormValue(allocator: mem.Allocator, in_stream: anytype, form_id: u64, endian: std.builtin.Endian, is_64: bool) anyerror!FormValue { |
| 493 | 603 | return switch (form_id) { |
| 494 | 604 | FORM.addr => FormValue{ .Address = try readAddress(in_stream, endian, @sizeOf(usize) == 8) }, |
| 605 | FORM.addrx1 => return FormValue{ .AddrOffset = try in_stream.readInt(u8, endian) }, |
| 606 | FORM.addrx2 => return FormValue{ .AddrOffset = try in_stream.readInt(u16, endian) }, |
| 607 | FORM.addrx3 => return FormValue{ .AddrOffset = try in_stream.readInt(u24, endian) }, |
| 608 | FORM.addrx4 => return FormValue{ .AddrOffset = try in_stream.readInt(u32, endian) }, |
| 609 | FORM.addrx => return FormValue{ .AddrOffset = try nosuspend leb.readULEB128(u64, in_stream) }, |
| 610 | |
| 495 | 611 | FORM.block1 => parseFormValueBlock(allocator, in_stream, endian, 1), |
| 496 | 612 | FORM.block2 => parseFormValueBlock(allocator, in_stream, endian, 2), |
| 497 | 613 | FORM.block4 => parseFormValueBlock(allocator, in_stream, endian, 4), |
| ... | ... | @@ -527,10 +643,11 @@ fn parseFormValue(allocator: mem.Allocator, in_stream: anytype, form_id: u64, en |
| 527 | 643 | |
| 528 | 644 | FORM.string => FormValue{ .String = try in_stream.readUntilDelimiterAlloc(allocator, 0, math.maxInt(usize)) }, |
| 529 | 645 | FORM.strp => FormValue{ .StrPtr = try readAddress(in_stream, endian, is_64) }, |
| 530 | | FORM.strx1 => return FormValue{ .StrOffset = @intCast(u64, try in_stream.readInt(u8, endian)) }, |
| 531 | | FORM.strx2 => return FormValue{ .StrOffset = @intCast(u64, try in_stream.readInt(u16, endian)) }, |
| 532 | | FORM.strx3 => return FormValue{ .StrOffset = @intCast(u64, try in_stream.readInt(u24, endian)) }, |
| 533 | | FORM.strx4 => return FormValue{ .StrOffset = @intCast(u64, try in_stream.readInt(u32, endian)) }, |
| 646 | FORM.strx1 => return FormValue{ .StrOffset = try in_stream.readInt(u8, endian) }, |
| 647 | FORM.strx2 => return FormValue{ .StrOffset = try in_stream.readInt(u16, endian) }, |
| 648 | FORM.strx3 => return FormValue{ .StrOffset = try in_stream.readInt(u24, endian) }, |
| 649 | FORM.strx4 => return FormValue{ .StrOffset = try in_stream.readInt(u32, endian) }, |
| 650 | FORM.strx => return FormValue{ .StrOffset = try nosuspend leb.readULEB128(u64, in_stream) }, |
| 534 | 651 | FORM.line_strp => FormValue{ .LineStrPtr = try readAddress(in_stream, endian, is_64) }, |
| 535 | 652 | FORM.indirect => { |
| 536 | 653 | const child_form_id = try nosuspend leb.readULEB128(u64, in_stream); |
| ... | ... | @@ -543,9 +660,11 @@ fn parseFormValue(allocator: mem.Allocator, in_stream: anytype, form_id: u64, en |
| 543 | 660 | return await @asyncCall(frame, {}, parseFormValue, .{ allocator, in_stream, child_form_id, endian, is_64 }); |
| 544 | 661 | }, |
| 545 | 662 | FORM.implicit_const => FormValue{ .Const = Constant{ .signed = true, .payload = undefined } }, |
| 546 | | |
| 663 | FORM.loclistx => return FormValue{ .LocListOffset = try nosuspend leb.readULEB128(u64, in_stream) }, |
| 664 | FORM.rnglistx => return FormValue{ .RangeListOffset = try nosuspend leb.readULEB128(u64, in_stream) }, |
| 547 | 665 | else => { |
| 548 | | return error.InvalidDebugInfo; |
| 666 | std.debug.print("unrecognized form id: {x}\n", .{form_id}); |
| 667 | return badDwarf(); |
| 549 | 668 | }, |
| 550 | 669 | }; |
| 551 | 670 | } |
| ... | ... | @@ -567,6 +686,11 @@ pub const DwarfInfo = struct { |
| 567 | 686 | debug_line: []const u8, |
| 568 | 687 | debug_line_str: ?[]const u8, |
| 569 | 688 | debug_ranges: ?[]const u8, |
| 689 | debug_loclists: ?[]const u8, |
| 690 | debug_rnglists: ?[]const u8, |
| 691 | debug_addr: ?[]const u8, |
| 692 | debug_names: ?[]const u8, |
| 693 | debug_frame: ?[]const u8, |
| 570 | 694 | // Filled later by the initializer |
| 571 | 695 | abbrev_table_list: std.ArrayListUnmanaged(AbbrevTableHeader) = .{}, |
| 572 | 696 | compile_unit_list: std.ArrayListUnmanaged(CompileUnit) = .{}, |
| ... | ... | @@ -602,7 +726,7 @@ pub const DwarfInfo = struct { |
| 602 | 726 | |
| 603 | 727 | fn scanAllFunctions(di: *DwarfInfo, allocator: mem.Allocator) !void { |
| 604 | 728 | var stream = io.fixedBufferStream(di.debug_info); |
| 605 | | const in = &stream.reader(); |
| 729 | const in = stream.reader(); |
| 606 | 730 | const seekable = &stream.seekableStream(); |
| 607 | 731 | var this_unit_offset: u64 = 0; |
| 608 | 732 | |
| ... | ... | @@ -619,29 +743,26 @@ pub const DwarfInfo = struct { |
| 619 | 743 | const next_offset = unit_length + (if (is_64) @as(usize, 12) else @as(usize, 4)); |
| 620 | 744 | |
| 621 | 745 | const version = try in.readInt(u16, di.endian); |
| 622 | | if (version < 2 or version > 5) return error.InvalidDebugInfo; |
| 746 | if (version < 2 or version > 5) return badDwarf(); |
| 623 | 747 | |
| 624 | 748 | var address_size: u8 = undefined; |
| 625 | 749 | var debug_abbrev_offset: u64 = undefined; |
| 626 | | switch (version) { |
| 627 | | 5 => { |
| 628 | | const unit_type = try in.readInt(u8, di.endian); |
| 629 | | if (unit_type != UT.compile) return error.InvalidDebugInfo; |
| 630 | | address_size = try in.readByte(); |
| 631 | | debug_abbrev_offset = if (is_64) |
| 632 | | try in.readInt(u64, di.endian) |
| 633 | | else |
| 634 | | try in.readInt(u32, di.endian); |
| 635 | | }, |
| 636 | | else => { |
| 637 | | debug_abbrev_offset = if (is_64) |
| 638 | | try in.readInt(u64, di.endian) |
| 639 | | else |
| 640 | | try in.readInt(u32, di.endian); |
| 641 | | address_size = try in.readByte(); |
| 642 | | }, |
| 750 | if (version >= 5) { |
| 751 | const unit_type = try in.readInt(u8, di.endian); |
| 752 | if (unit_type != UT.compile) return badDwarf(); |
| 753 | address_size = try in.readByte(); |
| 754 | debug_abbrev_offset = if (is_64) |
| 755 | try in.readInt(u64, di.endian) |
| 756 | else |
| 757 | try in.readInt(u32, di.endian); |
| 758 | } else { |
| 759 | debug_abbrev_offset = if (is_64) |
| 760 | try in.readInt(u64, di.endian) |
| 761 | else |
| 762 | try in.readInt(u32, di.endian); |
| 763 | address_size = try in.readByte(); |
| 643 | 764 | } |
| 644 | | if (address_size != @sizeOf(usize)) return error.InvalidDebugInfo; |
| 765 | if (address_size != @sizeOf(usize)) return badDwarf(); |
| 645 | 766 | |
| 646 | 767 | const compile_unit_pos = try seekable.getPos(); |
| 647 | 768 | const abbrev_table = try di.getAbbrevTable(allocator, debug_abbrev_offset); |
| ... | ... | @@ -662,30 +783,30 @@ pub const DwarfInfo = struct { |
| 662 | 783 | // Prevent endless loops |
| 663 | 784 | while (depth > 0) : (depth -= 1) { |
| 664 | 785 | if (this_die_obj.getAttr(AT.name)) |_| { |
| 665 | | const name = try this_die_obj.getAttrString(di, AT.name, is_64); |
| 786 | const name = try this_die_obj.getAttrString(di, AT.name, di.debug_str); |
| 666 | 787 | break :x try allocator.dupe(u8, name); |
| 667 | 788 | } else if (this_die_obj.getAttr(AT.abstract_origin)) |_| { |
| 668 | 789 | // Follow the DIE it points to and repeat |
| 669 | 790 | const ref_offset = try this_die_obj.getAttrRef(AT.abstract_origin); |
| 670 | | if (ref_offset > next_offset) return error.InvalidDebugInfo; |
| 791 | if (ref_offset > next_offset) return badDwarf(); |
| 671 | 792 | try seekable.seekTo(this_unit_offset + ref_offset); |
| 672 | 793 | this_die_obj = (try di.parseDie( |
| 673 | 794 | arena, |
| 674 | 795 | in, |
| 675 | 796 | abbrev_table, |
| 676 | 797 | is_64, |
| 677 | | )) orelse return error.InvalidDebugInfo; |
| 798 | )) orelse return badDwarf(); |
| 678 | 799 | } else if (this_die_obj.getAttr(AT.specification)) |_| { |
| 679 | 800 | // Follow the DIE it points to and repeat |
| 680 | 801 | const ref_offset = try this_die_obj.getAttrRef(AT.specification); |
| 681 | | if (ref_offset > next_offset) return error.InvalidDebugInfo; |
| 802 | if (ref_offset > next_offset) return badDwarf(); |
| 682 | 803 | try seekable.seekTo(this_unit_offset + ref_offset); |
| 683 | 804 | this_die_obj = (try di.parseDie( |
| 684 | 805 | arena, |
| 685 | 806 | in, |
| 686 | 807 | abbrev_table, |
| 687 | 808 | is_64, |
| 688 | | )) orelse return error.InvalidDebugInfo; |
| 809 | )) orelse return badDwarf(); |
| 689 | 810 | } else { |
| 690 | 811 | break :x null; |
| 691 | 812 | } |
| ... | ... | @@ -695,7 +816,7 @@ pub const DwarfInfo = struct { |
| 695 | 816 | }; |
| 696 | 817 | |
| 697 | 818 | const pc_range = x: { |
| 698 | | if (die_obj.getAttrAddr(AT.low_pc)) |low_pc| { |
| 819 | if (die_obj.getAttrAddr(di, AT.low_pc)) |low_pc| { |
| 699 | 820 | if (die_obj.getAttr(AT.high_pc)) |high_pc_value| { |
| 700 | 821 | const pc_end = switch (high_pc_value.*) { |
| 701 | 822 | FormValue.Address => |value| value, |
| ... | ... | @@ -703,7 +824,7 @@ pub const DwarfInfo = struct { |
| 703 | 824 | const offset = try value.asUnsignedLe(); |
| 704 | 825 | break :b (low_pc + offset); |
| 705 | 826 | }, |
| 706 | | else => return error.InvalidDebugInfo, |
| 827 | else => return badDwarf(), |
| 707 | 828 | }; |
| 708 | 829 | break :x PcRange{ |
| 709 | 830 | .start = low_pc, |
| ... | ... | @@ -748,14 +869,14 @@ pub const DwarfInfo = struct { |
| 748 | 869 | const next_offset = unit_length + (if (is_64) @as(usize, 12) else @as(usize, 4)); |
| 749 | 870 | |
| 750 | 871 | const version = try in.readInt(u16, di.endian); |
| 751 | | if (version < 2 or version > 5) return error.InvalidDebugInfo; |
| 872 | if (version < 2 or version > 5) return badDwarf(); |
| 752 | 873 | |
| 753 | 874 | var address_size: u8 = undefined; |
| 754 | 875 | var debug_abbrev_offset: u64 = undefined; |
| 755 | 876 | switch (version) { |
| 756 | 877 | 5 => { |
| 757 | 878 | const unit_type = try in.readInt(u8, di.endian); |
| 758 | | if (unit_type != UT.compile) return error.InvalidDebugInfo; |
| 879 | if (unit_type != UT.compile) return badDwarf(); |
| 759 | 880 | address_size = try in.readByte(); |
| 760 | 881 | debug_abbrev_offset = if (is_64) |
| 761 | 882 | try in.readInt(u64, di.endian) |
| ... | ... | @@ -770,7 +891,7 @@ pub const DwarfInfo = struct { |
| 770 | 891 | address_size = try in.readByte(); |
| 771 | 892 | }, |
| 772 | 893 | } |
| 773 | | if (address_size != @sizeOf(usize)) return error.InvalidDebugInfo; |
| 894 | if (address_size != @sizeOf(usize)) return badDwarf(); |
| 774 | 895 | |
| 775 | 896 | const compile_unit_pos = try seekable.getPos(); |
| 776 | 897 | const abbrev_table = try di.getAbbrevTable(allocator, debug_abbrev_offset); |
| ... | ... | @@ -780,12 +901,12 @@ pub const DwarfInfo = struct { |
| 780 | 901 | const compile_unit_die = try allocator.create(Die); |
| 781 | 902 | errdefer allocator.destroy(compile_unit_die); |
| 782 | 903 | compile_unit_die.* = (try di.parseDie(allocator, in, abbrev_table, is_64)) orelse |
| 783 | | return error.InvalidDebugInfo; |
| 904 | return badDwarf(); |
| 784 | 905 | |
| 785 | | if (compile_unit_die.tag_id != TAG.compile_unit) return error.InvalidDebugInfo; |
| 906 | if (compile_unit_die.tag_id != TAG.compile_unit) return badDwarf(); |
| 786 | 907 | |
| 787 | 908 | const pc_range = x: { |
| 788 | | if (compile_unit_die.getAttrAddr(AT.low_pc)) |low_pc| { |
| 909 | if (compile_unit_die.getAttrAddr(di, AT.low_pc)) |low_pc| { |
| 789 | 910 | if (compile_unit_die.getAttr(AT.high_pc)) |high_pc_value| { |
| 790 | 911 | const pc_end = switch (high_pc_value.*) { |
| 791 | 912 | FormValue.Address => |value| value, |
| ... | ... | @@ -793,7 +914,7 @@ pub const DwarfInfo = struct { |
| 793 | 914 | const offset = try value.asUnsignedLe(); |
| 794 | 915 | break :b (low_pc + offset); |
| 795 | 916 | }, |
| 796 | | else => return error.InvalidDebugInfo, |
| 917 | else => return badDwarf(), |
| 797 | 918 | }; |
| 798 | 919 | break :x PcRange{ |
| 799 | 920 | .start = low_pc, |
| ... | ... | @@ -834,7 +955,7 @@ pub const DwarfInfo = struct { |
| 834 | 955 | // specified by DW_AT.low_pc or to some other value encoded |
| 835 | 956 | // in the list itself. |
| 836 | 957 | // If no starting value is specified use zero. |
| 837 | | var base_address = compile_unit.die.getAttrAddr(AT.low_pc) catch |err| switch (err) { |
| 958 | var base_address = compile_unit.die.getAttrAddr(di, AT.low_pc) catch |err| switch (err) { |
| 838 | 959 | error.MissingDebugInfo => @as(u64, 0), // TODO https://github.com/ziglang/zig/issues/11135 |
| 839 | 960 | else => return err, |
| 840 | 961 | }; |
| ... | ... | @@ -862,7 +983,7 @@ pub const DwarfInfo = struct { |
| 862 | 983 | } |
| 863 | 984 | } |
| 864 | 985 | } |
| 865 | | return error.MissingDebugInfo; |
| 986 | return missingDwarf(); |
| 866 | 987 | } |
| 867 | 988 | |
| 868 | 989 | /// Gets an already existing AbbrevTable given the abbrev_offset, or if not found, |
| ... | ... | @@ -929,7 +1050,7 @@ pub const DwarfInfo = struct { |
| 929 | 1050 | ) !?Die { |
| 930 | 1051 | const abbrev_code = try leb.readULEB128(u64, in_stream); |
| 931 | 1052 | if (abbrev_code == 0) return null; |
| 932 | | const table_entry = getAbbrevTableEntry(abbrev_table, abbrev_code) orelse return error.InvalidDebugInfo; |
| 1053 | const table_entry = getAbbrevTableEntry(abbrev_table, abbrev_code) orelse return badDwarf(); |
| 933 | 1054 | |
| 934 | 1055 | var result = Die{ |
| 935 | 1056 | // Lives as long as the Die. |
| ... | ... | @@ -966,7 +1087,7 @@ pub const DwarfInfo = struct { |
| 966 | 1087 | const in = &stream.reader(); |
| 967 | 1088 | const seekable = &stream.seekableStream(); |
| 968 | 1089 | |
| 969 | | const compile_unit_cwd = try compile_unit.die.getAttrString(di, AT.comp_dir, compile_unit.is_64); |
| 1090 | const compile_unit_cwd = try compile_unit.die.getAttrString(di, AT.comp_dir, di.debug_line_str); |
| 970 | 1091 | const line_info_offset = try compile_unit.die.getAttrSecOffset(AT.stmt_list); |
| 971 | 1092 | |
| 972 | 1093 | try seekable.seekTo(line_info_offset); |
| ... | ... | @@ -974,18 +1095,25 @@ pub const DwarfInfo = struct { |
| 974 | 1095 | var is_64: bool = undefined; |
| 975 | 1096 | const unit_length = try readUnitLength(in, di.endian, &is_64); |
| 976 | 1097 | if (unit_length == 0) { |
| 977 | | return error.MissingDebugInfo; |
| 1098 | return missingDwarf(); |
| 978 | 1099 | } |
| 979 | 1100 | const next_offset = unit_length + (if (is_64) @as(usize, 12) else @as(usize, 4)); |
| 980 | 1101 | |
| 981 | 1102 | const version = try in.readInt(u16, di.endian); |
| 982 | | if (version < 2 or version > 4) return error.InvalidDebugInfo; |
| 1103 | if (version < 2) return badDwarf(); |
| 1104 | |
| 1105 | var addr_size: u8 = if (is_64) 8 else 4; |
| 1106 | var seg_size: u8 = 0; |
| 1107 | if (version >= 5) { |
| 1108 | addr_size = try in.readByte(); |
| 1109 | seg_size = try in.readByte(); |
| 1110 | } |
| 983 | 1111 | |
| 984 | 1112 | const prologue_length = if (is_64) try in.readInt(u64, di.endian) else try in.readInt(u32, di.endian); |
| 985 | 1113 | const prog_start_offset = (try seekable.getPos()) + prologue_length; |
| 986 | 1114 | |
| 987 | 1115 | const minimum_instruction_length = try in.readByte(); |
| 988 | | if (minimum_instruction_length == 0) return error.InvalidDebugInfo; |
| 1116 | if (minimum_instruction_length == 0) return badDwarf(); |
| 989 | 1117 | |
| 990 | 1118 | if (version >= 4) { |
| 991 | 1119 | // maximum_operations_per_instruction |
| ... | ... | @@ -996,7 +1124,7 @@ pub const DwarfInfo = struct { |
| 996 | 1124 | const line_base = try in.readByteSigned(); |
| 997 | 1125 | |
| 998 | 1126 | const line_range = try in.readByte(); |
| 999 | | if (line_range == 0) return error.InvalidDebugInfo; |
| 1127 | if (line_range == 0) return badDwarf(); |
| 1000 | 1128 | |
| 1001 | 1129 | const opcode_base = try in.readByte(); |
| 1002 | 1130 | |
| ... | ... | @@ -1014,36 +1142,120 @@ pub const DwarfInfo = struct { |
| 1014 | 1142 | defer tmp_arena.deinit(); |
| 1015 | 1143 | const arena = tmp_arena.allocator(); |
| 1016 | 1144 | |
| 1017 | | var include_directories = std.ArrayList([]const u8).init(arena); |
| 1018 | | try include_directories.append(compile_unit_cwd); |
| 1145 | var include_directories = std.ArrayList(FileEntry).init(arena); |
| 1146 | var file_entries = std.ArrayList(FileEntry).init(arena); |
| 1019 | 1147 | |
| 1020 | | while (true) { |
| 1021 | | const dir = try in.readUntilDelimiterAlloc(arena, 0, math.maxInt(usize)); |
| 1022 | | if (dir.len == 0) break; |
| 1023 | | try include_directories.append(dir); |
| 1148 | if (version < 5) { |
| 1149 | try include_directories.append(.{ .path = compile_unit_cwd }); |
| 1150 | |
| 1151 | while (true) { |
| 1152 | const dir = try in.readUntilDelimiterAlloc(arena, 0, math.maxInt(usize)); |
| 1153 | if (dir.len == 0) break; |
| 1154 | try include_directories.append(.{ .path = dir }); |
| 1155 | } |
| 1156 | |
| 1157 | while (true) { |
| 1158 | const file_name = try in.readUntilDelimiterAlloc(arena, 0, math.maxInt(usize)); |
| 1159 | if (file_name.len == 0) break; |
| 1160 | const dir_index = try leb.readULEB128(u32, in); |
| 1161 | const mtime = try leb.readULEB128(u64, in); |
| 1162 | const size = try leb.readULEB128(u64, in); |
| 1163 | try file_entries.append(FileEntry{ |
| 1164 | .path = file_name, |
| 1165 | .dir_index = dir_index, |
| 1166 | .mtime = mtime, |
| 1167 | .size = size, |
| 1168 | }); |
| 1169 | } |
| 1170 | } else { |
| 1171 | const FileEntFmt = struct { |
| 1172 | content_type_code: u8, |
| 1173 | form_code: u16, |
| 1174 | }; |
| 1175 | { |
| 1176 | var dir_ent_fmt_buf: [10]FileEntFmt = undefined; |
| 1177 | const directory_entry_format_count = try in.readByte(); |
| 1178 | if (directory_entry_format_count > dir_ent_fmt_buf.len) return badDwarf(); |
| 1179 | for (dir_ent_fmt_buf[0..directory_entry_format_count]) |*ent_fmt| { |
| 1180 | ent_fmt.* = .{ |
| 1181 | .content_type_code = try leb.readULEB128(u8, in), |
| 1182 | .form_code = try leb.readULEB128(u16, in), |
| 1183 | }; |
| 1184 | } |
| 1185 | |
| 1186 | const directories_count = try leb.readULEB128(usize, in); |
| 1187 | try include_directories.ensureUnusedCapacity(directories_count); |
| 1188 | { |
| 1189 | var i: usize = 0; |
| 1190 | while (i < directories_count) : (i += 1) { |
| 1191 | var e: FileEntry = .{ .path = &.{} }; |
| 1192 | for (dir_ent_fmt_buf[0..directory_entry_format_count]) |ent_fmt| { |
| 1193 | const form_value = try parseFormValue( |
| 1194 | arena, |
| 1195 | in, |
| 1196 | ent_fmt.form_code, |
| 1197 | di.endian, |
| 1198 | is_64, |
| 1199 | ); |
| 1200 | switch (ent_fmt.content_type_code) { |
| 1201 | LNCT.path => e.path = try form_value.getString(di.*), |
| 1202 | LNCT.directory_index => e.dir_index = try form_value.getUInt(u32), |
| 1203 | LNCT.timestamp => e.mtime = try form_value.getUInt(u64), |
| 1204 | LNCT.size => e.size = try form_value.getUInt(u64), |
| 1205 | LNCT.MD5 => e.md5 = try form_value.getUInt(u128), |
| 1206 | else => continue, |
| 1207 | } |
| 1208 | } |
| 1209 | include_directories.appendAssumeCapacity(e); |
| 1210 | } |
| 1211 | } |
| 1212 | } |
| 1213 | |
| 1214 | var file_ent_fmt_buf: [10]FileEntFmt = undefined; |
| 1215 | const file_name_entry_format_count = try in.readByte(); |
| 1216 | if (file_name_entry_format_count > file_ent_fmt_buf.len) return badDwarf(); |
| 1217 | for (file_ent_fmt_buf[0..file_name_entry_format_count]) |*ent_fmt| { |
| 1218 | ent_fmt.* = .{ |
| 1219 | .content_type_code = try leb.readULEB128(u8, in), |
| 1220 | .form_code = try leb.readULEB128(u16, in), |
| 1221 | }; |
| 1222 | } |
| 1223 | |
| 1224 | const file_names_count = try leb.readULEB128(usize, in); |
| 1225 | try file_entries.ensureUnusedCapacity(file_names_count); |
| 1226 | { |
| 1227 | var i: usize = 0; |
| 1228 | while (i < file_names_count) : (i += 1) { |
| 1229 | var e: FileEntry = .{ .path = &.{} }; |
| 1230 | for (file_ent_fmt_buf[0..file_name_entry_format_count]) |ent_fmt| { |
| 1231 | const form_value = try parseFormValue( |
| 1232 | arena, |
| 1233 | in, |
| 1234 | ent_fmt.form_code, |
| 1235 | di.endian, |
| 1236 | is_64, |
| 1237 | ); |
| 1238 | switch (ent_fmt.content_type_code) { |
| 1239 | LNCT.path => e.path = try form_value.getString(di.*), |
| 1240 | LNCT.directory_index => e.dir_index = try form_value.getUInt(u32), |
| 1241 | LNCT.timestamp => e.mtime = try form_value.getUInt(u64), |
| 1242 | LNCT.size => e.size = try form_value.getUInt(u64), |
| 1243 | LNCT.MD5 => e.md5 = try form_value.getUInt(u128), |
| 1244 | else => continue, |
| 1245 | } |
| 1246 | } |
| 1247 | file_entries.appendAssumeCapacity(e); |
| 1248 | } |
| 1249 | } |
| 1024 | 1250 | } |
| 1025 | 1251 | |
| 1026 | | var file_entries = std.ArrayList(FileEntry).init(arena); |
| 1027 | 1252 | var prog = LineNumberProgram.init( |
| 1028 | 1253 | default_is_stmt, |
| 1029 | 1254 | include_directories.items, |
| 1030 | 1255 | target_address, |
| 1256 | version, |
| 1031 | 1257 | ); |
| 1032 | 1258 | |
| 1033 | | while (true) { |
| 1034 | | const file_name = try in.readUntilDelimiterAlloc(arena, 0, math.maxInt(usize)); |
| 1035 | | if (file_name.len == 0) break; |
| 1036 | | const dir_index = try leb.readULEB128(usize, in); |
| 1037 | | const mtime = try leb.readULEB128(usize, in); |
| 1038 | | const len_bytes = try leb.readULEB128(usize, in); |
| 1039 | | try file_entries.append(FileEntry{ |
| 1040 | | .file_name = file_name, |
| 1041 | | .dir_index = dir_index, |
| 1042 | | .mtime = mtime, |
| 1043 | | .len_bytes = len_bytes, |
| 1044 | | }); |
| 1045 | | } |
| 1046 | | |
| 1047 | 1259 | try seekable.seekTo(prog_start_offset); |
| 1048 | 1260 | |
| 1049 | 1261 | const next_unit_pos = line_info_offset + next_offset; |
| ... | ... | @@ -1053,7 +1265,7 @@ pub const DwarfInfo = struct { |
| 1053 | 1265 | |
| 1054 | 1266 | if (opcode == LNS.extended_op) { |
| 1055 | 1267 | const op_size = try leb.readULEB128(u64, in); |
| 1056 | | if (op_size < 1) return error.InvalidDebugInfo; |
| 1268 | if (op_size < 1) return badDwarf(); |
| 1057 | 1269 | var sub_op = try in.readByte(); |
| 1058 | 1270 | switch (sub_op) { |
| 1059 | 1271 | LNE.end_sequence => { |
| ... | ... | @@ -1066,19 +1278,19 @@ pub const DwarfInfo = struct { |
| 1066 | 1278 | prog.address = addr; |
| 1067 | 1279 | }, |
| 1068 | 1280 | LNE.define_file => { |
| 1069 | | const file_name = try in.readUntilDelimiterAlloc(arena, 0, math.maxInt(usize)); |
| 1070 | | const dir_index = try leb.readULEB128(usize, in); |
| 1071 | | const mtime = try leb.readULEB128(usize, in); |
| 1072 | | const len_bytes = try leb.readULEB128(usize, in); |
| 1281 | const path = try in.readUntilDelimiterAlloc(arena, 0, math.maxInt(usize)); |
| 1282 | const dir_index = try leb.readULEB128(u32, in); |
| 1283 | const mtime = try leb.readULEB128(u64, in); |
| 1284 | const size = try leb.readULEB128(u64, in); |
| 1073 | 1285 | try file_entries.append(FileEntry{ |
| 1074 | | .file_name = file_name, |
| 1286 | .path = path, |
| 1075 | 1287 | .dir_index = dir_index, |
| 1076 | 1288 | .mtime = mtime, |
| 1077 | | .len_bytes = len_bytes, |
| 1289 | .size = size, |
| 1078 | 1290 | }); |
| 1079 | 1291 | }, |
| 1080 | 1292 | else => { |
| 1081 | | const fwd_amt = math.cast(isize, op_size - 1) orelse return error.InvalidDebugInfo; |
| 1293 | const fwd_amt = math.cast(isize, op_size - 1) orelse return badDwarf(); |
| 1082 | 1294 | try seekable.seekBy(fwd_amt); |
| 1083 | 1295 | }, |
| 1084 | 1296 | } |
| ... | ... | @@ -1129,7 +1341,7 @@ pub const DwarfInfo = struct { |
| 1129 | 1341 | }, |
| 1130 | 1342 | LNS.set_prologue_end => {}, |
| 1131 | 1343 | else => { |
| 1132 | | if (opcode - 1 >= standard_opcode_lengths.len) return error.InvalidDebugInfo; |
| 1344 | if (opcode - 1 >= standard_opcode_lengths.len) return badDwarf(); |
| 1133 | 1345 | const len_bytes = standard_opcode_lengths[opcode - 1]; |
| 1134 | 1346 | try seekable.seekBy(len_bytes); |
| 1135 | 1347 | }, |
| ... | ... | @@ -1137,50 +1349,15 @@ pub const DwarfInfo = struct { |
| 1137 | 1349 | } |
| 1138 | 1350 | } |
| 1139 | 1351 | |
| 1140 | | return error.MissingDebugInfo; |
| 1352 | return missingDwarf(); |
| 1141 | 1353 | } |
| 1142 | 1354 | |
| 1143 | | fn getString(di: *DwarfInfo, offset: u64) ![]const u8 { |
| 1144 | | if (offset > di.debug_str.len) |
| 1145 | | return error.InvalidDebugInfo; |
| 1146 | | const casted_offset = math.cast(usize, offset) orelse |
| 1147 | | return error.InvalidDebugInfo; |
| 1148 | | |
| 1149 | | // Valid strings always have a terminating zero byte |
| 1150 | | if (mem.indexOfScalarPos(u8, di.debug_str, casted_offset, 0)) |last| { |
| 1151 | | return di.debug_str[casted_offset..last]; |
| 1152 | | } |
| 1153 | | |
| 1154 | | return error.InvalidDebugInfo; |
| 1355 | fn getString(di: DwarfInfo, offset: u64) ![]const u8 { |
| 1356 | return getStringGeneric(di.debug_str, offset); |
| 1155 | 1357 | } |
| 1156 | 1358 | |
| 1157 | | fn getStringOffset(di: *DwarfInfo, offset: u64, is_64: bool) !u64 { |
| 1158 | | if (di.debug_str_offsets) |debug_str_offsets| { |
| 1159 | | if (offset >= debug_str_offsets.len) { |
| 1160 | | return error.InvalidDebugInfo; |
| 1161 | | } |
| 1162 | | const offset_casted = @intCast(usize, offset); |
| 1163 | | if (is_64) { |
| 1164 | | return std.mem.readIntSlice(u64, debug_str_offsets[offset_casted .. offset_casted + 8], di.endian); |
| 1165 | | } |
| 1166 | | return @intCast(u64, std.mem.readIntSlice(u32, debug_str_offsets[offset_casted .. offset_casted + 4], di.endian)); |
| 1167 | | } |
| 1168 | | return error.InvalidDebugInfo; |
| 1169 | | } |
| 1170 | | |
| 1171 | | fn getLineString(di: *DwarfInfo, offset: u64) ![]const u8 { |
| 1172 | | const debug_line_str = di.debug_line_str orelse return error.InvalidDebugInfo; |
| 1173 | | if (offset > debug_line_str.len) |
| 1174 | | return error.InvalidDebugInfo; |
| 1175 | | const casted_offset = math.cast(usize, offset) orelse |
| 1176 | | return error.InvalidDebugInfo; |
| 1177 | | |
| 1178 | | // Valid strings always have a terminating zero byte |
| 1179 | | if (mem.indexOfScalarPos(u8, debug_line_str, casted_offset, 0)) |last| { |
| 1180 | | return debug_line_str[casted_offset..last]; |
| 1181 | | } |
| 1182 | | |
| 1183 | | return error.InvalidDebugInfo; |
| 1359 | fn getLineString(di: DwarfInfo, offset: u64) ![]const u8 { |
| 1360 | return getStringGeneric(di.debug_line_str, offset); |
| 1184 | 1361 | } |
| 1185 | 1362 | }; |
| 1186 | 1363 | |
| ... | ... | @@ -1190,3 +1367,24 @@ pub fn openDwarfDebugInfo(di: *DwarfInfo, allocator: mem.Allocator) !void { |
| 1190 | 1367 | try di.scanAllFunctions(allocator); |
| 1191 | 1368 | try di.scanAllCompileUnits(allocator); |
| 1192 | 1369 | } |
| 1370 | |
| 1371 | /// This function is to make it handy to comment out the return and make it |
| 1372 | /// into a crash when working on this file. |
| 1373 | inline fn badDwarf() error{InvalidDebugInfo} { |
| 1374 | //std.os.abort(); // can be handy to uncomment when working on this file |
| 1375 | return error.InvalidDebugInfo; |
| 1376 | } |
| 1377 | |
| 1378 | inline fn missingDwarf() error{MissingDebugInfo} { |
| 1379 | //std.os.abort(); // can be handy to uncomment when working on this file |
| 1380 | return error.MissingDebugInfo; |
| 1381 | } |
| 1382 | |
| 1383 | fn getStringGeneric(opt_str: ?[]const u8, offset: u64) ![:0]const u8 { |
| 1384 | const str = opt_str orelse return badDwarf(); |
| 1385 | if (offset > str.len) return badDwarf(); |
| 1386 | const casted_offset = math.cast(usize, offset) orelse return badDwarf(); |
| 1387 | // Valid strings always have a terminating zero byte |
| 1388 | const last = mem.indexOfScalarPos(u8, str, casted_offset, 0) orelse return badDwarf(); |
| 1389 | return str[casted_offset..last :0]; |
| 1390 | } |
Andrew Kelley <andrew@ziglang.org> 2022-08-23 00:28:15-07:00
src