| ... | ... | @@ -245,6 +245,82 @@ pub const Zld = struct { |
| 245 | 245 | try self.resolveSymbolsAtLoading(); |
| 246 | 246 | } |
| 247 | 247 | |
| 248 | fn resolveGlobalSymbol(self: *Zld, current: SymbolWithLoc) !void { |
| 249 | const gpa = self.gpa; |
| 250 | const sym = self.getSymbol(current); |
| 251 | const sym_name = self.getSymbolName(current); |
| 252 | |
| 253 | const gop = try self.getOrPutGlobalPtr(sym_name); |
| 254 | if (!gop.found_existing) { |
| 255 | gop.value_ptr.* = current; |
| 256 | if (sym.undf() and !sym.tentative()) { |
| 257 | try self.unresolved.putNoClobber(gpa, self.getGlobalIndex(sym_name).?, {}); |
| 258 | } |
| 259 | return; |
| 260 | } |
| 261 | const global_index = self.getGlobalIndex(sym_name).?; |
| 262 | const global = gop.value_ptr.*; |
| 263 | const global_sym = self.getSymbol(global); |
| 264 | |
| 265 | // Cases to consider: sym vs global_sym |
| 266 | // 1. strong(sym) and strong(global_sym) => error |
| 267 | // 2. strong(sym) and weak(global_sym) => sym |
| 268 | // 3. strong(sym) and tentative(global_sym) => sym |
| 269 | // 4. strong(sym) and undf(global_sym) => sym |
| 270 | // 5. weak(sym) and strong(global_sym) => global_sym |
| 271 | // 6. weak(sym) and tentative(global_sym) => sym |
| 272 | // 7. weak(sym) and undf(global_sym) => sym |
| 273 | // 8. tentative(sym) and strong(global_sym) => global_sym |
| 274 | // 9. tentative(sym) and weak(global_sym) => global_sym |
| 275 | // 10. tentative(sym) and tentative(global_sym) => pick larger |
| 276 | // 11. tentative(sym) and undf(global_sym) => sym |
| 277 | // 12. undf(sym) and * => global_sym |
| 278 | // |
| 279 | // Reduces to: |
| 280 | // 1. strong(sym) and strong(global_sym) => error |
| 281 | // 2. * and strong(global_sym) => global_sym |
| 282 | // 3. weak(sym) and weak(global_sym) => global_sym |
| 283 | // 4. tentative(sym) and tentative(global_sym) => pick larger |
| 284 | // 5. undf(sym) and * => global_sym |
| 285 | // 6. else => sym |
| 286 | |
| 287 | const sym_is_strong = sym.sect() and !(sym.weakDef() or sym.pext()); |
| 288 | const global_is_strong = global_sym.sect() and !(global_sym.weakDef() or global_sym.pext()); |
| 289 | const sym_is_weak = sym.sect() and (sym.weakDef() or sym.pext()); |
| 290 | const global_is_weak = global_sym.sect() and (global_sym.weakDef() or global_sym.pext()); |
| 291 | |
| 292 | if (sym_is_strong and global_is_strong) { |
| 293 | log.err("symbol '{s}' defined multiple times", .{sym_name}); |
| 294 | if (global.getFile()) |file| { |
| 295 | log.err(" first definition in '{s}'", .{self.objects.items[file].name}); |
| 296 | } |
| 297 | if (current.getFile()) |file| { |
| 298 | log.err(" next definition in '{s}'", .{self.objects.items[file].name}); |
| 299 | } |
| 300 | return error.MultipleSymbolDefinitions; |
| 301 | } |
| 302 | |
| 303 | if (current.getFile()) |file| { |
| 304 | const object = &self.objects.items[file]; |
| 305 | object.globals_lookup[current.sym_index] = global_index; |
| 306 | } |
| 307 | |
| 308 | if (global_is_strong) return; |
| 309 | if (sym_is_weak and global_is_weak) return; |
| 310 | if (sym.tentative() and global_sym.tentative()) { |
| 311 | if (global_sym.n_value >= sym.n_value) return; |
| 312 | } |
| 313 | if (sym.undf() and !sym.tentative()) return; |
| 314 | |
| 315 | if (global.getFile()) |file| { |
| 316 | const global_object = &self.objects.items[file]; |
| 317 | global_object.globals_lookup[global.sym_index] = global_index; |
| 318 | } |
| 319 | _ = self.unresolved.swapRemove(global_index); |
| 320 | |
| 321 | gop.value_ptr.* = current; |
| 322 | } |
| 323 | |
| 248 | 324 | fn resolveSymbolsInObject(self: *Zld, object_id: u32) !void { |
| 249 | 325 | const object = &self.objects.items[object_id]; |
| 250 | 326 | const in_symtab = object.in_symtab orelse return; |
| ... | ... | @@ -285,76 +361,7 @@ pub const Zld = struct { |
| 285 | 361 | continue; |
| 286 | 362 | } |
| 287 | 363 | |
| 288 | | const sym_loc = SymbolWithLoc{ .sym_index = sym_index, .file = object_id + 1 }; |
| 289 | | |
| 290 | | const gop = try self.getOrPutGlobalPtr(sym_name); |
| 291 | | if (!gop.found_existing) { |
| 292 | | gop.value_ptr.* = sym_loc; |
| 293 | | if (sym.undf() and !sym.tentative()) { |
| 294 | | try self.unresolved.putNoClobber(self.gpa, self.getGlobalIndex(sym_name).?, {}); |
| 295 | | } |
| 296 | | continue; |
| 297 | | } |
| 298 | | const global_index = self.getGlobalIndex(sym_name).?; |
| 299 | | const global = gop.value_ptr; |
| 300 | | const global_sym = self.getSymbol(global.*); |
| 301 | | |
| 302 | | // Cases to consider: sym vs global_sym |
| 303 | | // 1. strong(sym) and strong(global_sym) => error |
| 304 | | // 2. strong(sym) and weak(global_sym) => sym |
| 305 | | // 3. strong(sym) and tentative(global_sym) => sym |
| 306 | | // 4. strong(sym) and undf(global_sym) => sym |
| 307 | | // 5. weak(sym) and strong(global_sym) => global_sym |
| 308 | | // 6. weak(sym) and tentative(global_sym) => sym |
| 309 | | // 7. weak(sym) and undf(global_sym) => sym |
| 310 | | // 8. tentative(sym) and strong(global_sym) => global_sym |
| 311 | | // 9. tentative(sym) and weak(global_sym) => global_sym |
| 312 | | // 10. tentative(sym) and tentative(global_sym) => pick larger |
| 313 | | // 11. tentative(sym) and undf(global_sym) => sym |
| 314 | | // 12. undf(sym) and * => global_sym |
| 315 | | // |
| 316 | | // Reduces to: |
| 317 | | // 1. strong(sym) and strong(global_sym) => error |
| 318 | | // 2. * and strong(global_sym) => global_sym |
| 319 | | // 3. weak(sym) and weak(global_sym) => global_sym |
| 320 | | // 4. tentative(sym) and tentative(global_sym) => pick larger |
| 321 | | // 5. undf(sym) and * => global_sym |
| 322 | | // 6. else => sym |
| 323 | | |
| 324 | | const sym_is_strong = sym.sect() and !(sym.weakDef() or sym.pext()); |
| 325 | | const global_is_strong = global_sym.sect() and !(global_sym.weakDef() or global_sym.pext()); |
| 326 | | const sym_is_weak = sym.sect() and (sym.weakDef() or sym.pext()); |
| 327 | | const global_is_weak = global_sym.sect() and (global_sym.weakDef() or global_sym.pext()); |
| 328 | | |
| 329 | | if (sym_is_strong and global_is_strong) { |
| 330 | | log.err("symbol '{s}' defined multiple times", .{sym_name}); |
| 331 | | if (global.getFile()) |file| { |
| 332 | | log.err(" first definition in '{s}'", .{self.objects.items[file].name}); |
| 333 | | } |
| 334 | | log.err(" next definition in '{s}'", .{self.objects.items[object_id].name}); |
| 335 | | return error.MultipleSymbolDefinitions; |
| 336 | | } |
| 337 | | |
| 338 | | const update_global = blk: { |
| 339 | | if (global_is_strong) break :blk false; |
| 340 | | if (sym_is_weak and global_is_weak) break :blk false; |
| 341 | | if (sym.tentative() and global_sym.tentative()) { |
| 342 | | if (global_sym.n_value >= sym.n_value) break :blk false; |
| 343 | | } |
| 344 | | if (sym.undf() and !sym.tentative()) break :blk false; |
| 345 | | break :blk true; |
| 346 | | }; |
| 347 | | |
| 348 | | if (update_global) { |
| 349 | | if (global.getFile()) |file| { |
| 350 | | const global_object = &self.objects.items[file]; |
| 351 | | global_object.globals_lookup[global.sym_index] = global_index; |
| 352 | | } |
| 353 | | _ = self.unresolved.swapRemove(global_index); |
| 354 | | global.* = sym_loc; |
| 355 | | } else { |
| 356 | | object.globals_lookup[sym_index] = global_index; |
| 357 | | } |
| 364 | try self.resolveGlobalSymbol(.{ .sym_index = sym_index, .file = object_id + 1 }); |
| 358 | 365 | } |
| 359 | 366 | } |
| 360 | 367 | |
Jakub Konka <kubkon@jakubkonka.com> 2023-08-26 23:05:32+02:00
src