| ... | ... | @@ -7,8 +7,6 @@ llvm_object: ?*LlvmObject = null, |
| 7 | 7 | /// Debug symbols bundle (or dSym). |
| 8 | 8 | d_sym: ?DebugSymbols = null, |
| 9 | 9 | |
| 10 | | mode: Mode, |
| 11 | | |
| 12 | 10 | dyld_info_cmd: macho.dyld_info_command = .{}, |
| 13 | 11 | symtab_cmd: macho.symtab_command = .{}, |
| 14 | 12 | dysymtab_cmd: macho.dysymtab_command = .{}, |
| ... | ... | @@ -17,12 +15,6 @@ data_in_code_cmd: macho.linkedit_data_command = .{ .cmd = .DATA_IN_CODE }, |
| 17 | 15 | uuid_cmd: macho.uuid_command = .{ .uuid = [_]u8{0} ** 16 }, |
| 18 | 16 | codesig_cmd: macho.linkedit_data_command = .{ .cmd = .CODE_SIGNATURE }, |
| 19 | 17 | |
| 20 | | objects: std.ArrayListUnmanaged(Object) = .{}, |
| 21 | | archives: std.ArrayListUnmanaged(Archive) = .{}, |
| 22 | | dylibs: std.ArrayListUnmanaged(Dylib) = .{}, |
| 23 | | dylibs_map: std.StringHashMapUnmanaged(u16) = .{}, |
| 24 | | referenced_dylibs: std.AutoArrayHashMapUnmanaged(u16, void) = .{}, |
| 25 | | |
| 26 | 18 | segments: std.ArrayListUnmanaged(macho.segment_command_64) = .{}, |
| 27 | 19 | sections: std.MultiArrayList(Section) = .{}, |
| 28 | 20 | |
| ... | ... | @@ -48,93 +40,11 @@ got_section_index: ?u8 = null, |
| 48 | 40 | la_symbol_ptr_section_index: ?u8 = null, |
| 49 | 41 | tlv_ptr_section_index: ?u8 = null, |
| 50 | 42 | |
| 51 | | locals: std.ArrayListUnmanaged(macho.nlist_64) = .{}, |
| 52 | | globals: std.ArrayListUnmanaged(SymbolWithLoc) = .{}, |
| 53 | | resolver: std.StringHashMapUnmanaged(u32) = .{}, |
| 54 | | unresolved: std.AutoArrayHashMapUnmanaged(u32, void) = .{}, |
| 55 | | |
| 56 | | locals_free_list: std.ArrayListUnmanaged(u32) = .{}, |
| 57 | | globals_free_list: std.ArrayListUnmanaged(u32) = .{}, |
| 58 | | |
| 59 | | dyld_stub_binder_index: ?u32 = null, |
| 60 | | dyld_private_atom_index: ?Atom.Index = null, |
| 61 | | |
| 62 | 43 | strtab: StringTable = .{}, |
| 63 | 44 | |
| 64 | | got_table: TableSection(SymbolWithLoc) = .{}, |
| 65 | | stub_table: TableSection(SymbolWithLoc) = .{}, |
| 66 | | tlv_ptr_table: TableSection(SymbolWithLoc) = .{}, |
| 67 | | |
| 68 | | thunk_table: std.AutoHashMapUnmanaged(Atom.Index, thunks.Thunk.Index) = .{}, |
| 69 | | thunks: std.ArrayListUnmanaged(thunks.Thunk) = .{}, |
| 70 | | |
| 71 | | segment_table_dirty: bool = false, |
| 72 | | got_table_count_dirty: bool = false, |
| 73 | | got_table_contents_dirty: bool = false, |
| 74 | | stub_table_count_dirty: bool = false, |
| 75 | | stub_table_contents_dirty: bool = false, |
| 76 | | stub_helper_preamble_allocated: bool = false, |
| 77 | | |
| 78 | 45 | /// List of atoms that are either synthetic or map directly to the Zig source program. |
| 79 | 46 | atoms: std.ArrayListUnmanaged(Atom) = .{}, |
| 80 | 47 | |
| 81 | | /// Table of atoms indexed by the symbol index. |
| 82 | | atom_by_index_table: std.AutoHashMapUnmanaged(u32, Atom.Index) = .{}, |
| 83 | | |
| 84 | | /// Table of unnamed constants associated with a parent `Decl`. |
| 85 | | /// We store them here so that we can free the constants whenever the `Decl` |
| 86 | | /// needs updating or is freed. |
| 87 | | /// |
| 88 | | /// For example, |
| 89 | | /// |
| 90 | | /// ```zig |
| 91 | | /// const Foo = struct{ |
| 92 | | /// a: u8, |
| 93 | | /// }; |
| 94 | | /// |
| 95 | | /// pub fn main() void { |
| 96 | | /// var foo = Foo{ .a = 1 }; |
| 97 | | /// _ = foo; |
| 98 | | /// } |
| 99 | | /// ``` |
| 100 | | /// |
| 101 | | /// value assigned to label `foo` is an unnamed constant belonging/associated |
| 102 | | /// with `Decl` `main`, and lives as long as that `Decl`. |
| 103 | | unnamed_const_atoms: UnnamedConstTable = .{}, |
| 104 | | anon_decls: AnonDeclTable = .{}, |
| 105 | | |
| 106 | | /// A table of relocations indexed by the owning them `Atom`. |
| 107 | | /// Note that once we refactor `Atom`'s lifetime and ownership rules, |
| 108 | | /// this will be a table indexed by index into the list of Atoms. |
| 109 | | relocs: RelocationTable = .{}, |
| 110 | | /// TODO I do not have time to make this right but this will go once |
| 111 | | /// MachO linker is rewritten more-or-less to feature the same resolution |
| 112 | | /// mechanism as the ELF linker. |
| 113 | | actions: ActionTable = .{}, |
| 114 | | |
| 115 | | /// A table of rebases indexed by the owning them `Atom`. |
| 116 | | /// Note that once we refactor `Atom`'s lifetime and ownership rules, |
| 117 | | /// this will be a table indexed by index into the list of Atoms. |
| 118 | | rebases: RebaseTable = .{}, |
| 119 | | |
| 120 | | /// A table of bindings indexed by the owning them `Atom`. |
| 121 | | /// Note that once we refactor `Atom`'s lifetime and ownership rules, |
| 122 | | /// this will be a table indexed by index into the list of Atoms. |
| 123 | | bindings: BindingTable = .{}, |
| 124 | | |
| 125 | | /// Table of tracked LazySymbols. |
| 126 | | lazy_syms: LazySymbolTable = .{}, |
| 127 | | |
| 128 | | /// Table of tracked Decls. |
| 129 | | decls: DeclTable = .{}, |
| 130 | | |
| 131 | | /// Table of threadlocal variables descriptors. |
| 132 | | /// They are emitted in the `__thread_vars` section. |
| 133 | | tlv_table: TlvSymbolTable = .{}, |
| 134 | | |
| 135 | | /// Hot-code swapping state. |
| 136 | | hot_state: if (is_hot_update_compatible) HotUpdateState else struct {} = .{}, |
| 137 | | |
| 138 | 48 | sdk_layout: ?SdkLayout, |
| 139 | 49 | /// Size of the __PAGEZERO segment. |
| 140 | 50 | pagezero_vmsize: u64, |
| ... | ... | @@ -152,6 +62,9 @@ install_name: ?[]const u8, |
| 152 | 62 | entitlements: ?[]const u8, |
| 153 | 63 | compatibility_version: ?std.SemanticVersion, |
| 154 | 64 | |
| 65 | /// Hot-code swapping state. |
| 66 | hot_state: if (is_hot_update_compatible) HotUpdateState else struct {} = .{}, |
| 67 | |
| 155 | 68 | /// When adding a new field, remember to update `hashAddFrameworks`. |
| 156 | 69 | pub const Framework = struct { |
| 157 | 70 | needed: bool = false, |
| ... | ... | @@ -183,24 +96,18 @@ pub fn createEmpty( |
| 183 | 96 | ) !*MachO { |
| 184 | 97 | const target = comp.root_mod.resolved_target.result; |
| 185 | 98 | assert(target.ofmt == .macho); |
| 186 | | const use_llvm = comp.config.use_llvm; |
| 99 | |
| 187 | 100 | const gpa = comp.gpa; |
| 101 | const use_llvm = comp.config.use_llvm; |
| 102 | const opt_zcu = comp.module; |
| 188 | 103 | const optimize_mode = comp.root_mod.optimize_mode; |
| 189 | 104 | const output_mode = comp.config.output_mode; |
| 190 | 105 | const link_mode = comp.config.link_mode; |
| 191 | 106 | |
| 192 | | // TODO: get rid of zld mode |
| 193 | | const mode: Mode = if (use_llvm or !comp.config.have_zcu or comp.cache_use == .whole) |
| 194 | | .zld |
| 195 | | else |
| 196 | | .incremental; |
| 197 | | |
| 198 | | // If using "zld mode" to link, this code should produce an object file so that it |
| 199 | | // can be passed to "zld mode". TODO: get rid of "zld mode". |
| 200 | 107 | // If using LLVM to generate the object file for the zig compilation unit, |
| 201 | 108 | // we need a place to put the object file so that it can be subsequently |
| 202 | 109 | // handled. |
| 203 | | const zcu_object_sub_path = if (mode != .zld and !use_llvm) |
| 110 | const zcu_object_sub_path = if (!use_llvm) |
| 204 | 111 | null |
| 205 | 112 | else |
| 206 | 113 | try std.fmt.allocPrint(arena, "{s}.o", .{emit.sub_path}); |
| ... | ... | @@ -221,7 +128,6 @@ pub fn createEmpty( |
| 221 | 128 | .build_id = options.build_id, |
| 222 | 129 | .rpath_list = options.rpath_list, |
| 223 | 130 | }, |
| 224 | | .mode = mode, |
| 225 | 131 | .pagezero_vmsize = options.pagezero_size orelse default_pagezero_vmsize, |
| 226 | 132 | .headerpad_size = options.headerpad_size orelse default_headerpad_size, |
| 227 | 133 | .headerpad_max_install_names = options.headerpad_max_install_names, |
| ... | ... | @@ -243,62 +149,48 @@ pub fn createEmpty( |
| 243 | 149 | } |
| 244 | 150 | errdefer self.base.destroy(); |
| 245 | 151 | |
| 246 | | log.debug("selected linker mode '{s}'", .{@tagName(self.mode)}); |
| 247 | | |
| 248 | | if (mode == .zld) { |
| 249 | | // TODO: get rid of zld mode |
| 250 | | return self; |
| 251 | | } |
| 252 | | |
| 253 | | const file = try emit.directory.handle.createFile(emit.sub_path, .{ |
| 152 | self.base.file = try emit.directory.handle.createFile(emit.sub_path, .{ |
| 254 | 153 | .truncate = true, |
| 255 | 154 | .read = true, |
| 256 | 155 | .mode = link.File.determineMode(false, output_mode, link_mode), |
| 257 | 156 | }); |
| 258 | | self.base.file = file; |
| 259 | 157 | |
| 260 | | if (comp.config.debug_format != .strip and comp.module != null) { |
| 261 | | // Create dSYM bundle. |
| 262 | | log.debug("creating {s}.dSYM bundle", .{emit.sub_path}); |
| 158 | // Index 0 is always a null symbol. |
| 159 | // try self.locals.append(gpa, null_sym); |
| 160 | try self.strtab.buffer.append(gpa, 0); |
| 263 | 161 | |
| 264 | | const d_sym_path = try std.fmt.allocPrint( |
| 265 | | arena, |
| 266 | | "{s}.dSYM" ++ fs.path.sep_str ++ "Contents" ++ fs.path.sep_str ++ "Resources" ++ fs.path.sep_str ++ "DWARF", |
| 267 | | .{emit.sub_path}, |
| 268 | | ); |
| 162 | // TODO: init |
| 269 | 163 | |
| 270 | | var d_sym_bundle = try emit.directory.handle.makeOpenPath(d_sym_path, .{}); |
| 271 | | defer d_sym_bundle.close(); |
| 164 | if (opt_zcu) |zcu| { |
| 165 | if (!use_llvm) { |
| 166 | _ = zcu; |
| 167 | // TODO: create .zig_object |
| 272 | 168 | |
| 273 | | const d_sym_file = try d_sym_bundle.createFile(emit.sub_path, .{ |
| 274 | | .truncate = false, |
| 275 | | .read = true, |
| 276 | | }); |
| 169 | if (comp.config.debug_format != .strip) { |
| 170 | // Create dSYM bundle. |
| 171 | log.debug("creating {s}.dSYM bundle", .{emit.sub_path}); |
| 277 | 172 | |
| 278 | | self.d_sym = .{ |
| 279 | | .allocator = gpa, |
| 280 | | .dwarf = link.File.Dwarf.init(&self.base, .dwarf32), |
| 281 | | .file = d_sym_file, |
| 282 | | }; |
| 283 | | } |
| 173 | const d_sym_path = try std.fmt.allocPrint( |
| 174 | arena, |
| 175 | "{s}.dSYM" ++ fs.path.sep_str ++ "Contents" ++ fs.path.sep_str ++ "Resources" ++ fs.path.sep_str ++ "DWARF", |
| 176 | .{emit.sub_path}, |
| 177 | ); |
| 284 | 178 | |
| 285 | | // Index 0 is always a null symbol. |
| 286 | | try self.locals.append(gpa, .{ |
| 287 | | .n_strx = 0, |
| 288 | | .n_type = 0, |
| 289 | | .n_sect = 0, |
| 290 | | .n_desc = 0, |
| 291 | | .n_value = 0, |
| 292 | | }); |
| 293 | | try self.strtab.buffer.append(gpa, 0); |
| 179 | var d_sym_bundle = try emit.directory.handle.makeOpenPath(d_sym_path, .{}); |
| 180 | defer d_sym_bundle.close(); |
| 294 | 181 | |
| 295 | | try self.populateMissingMetadata(.{ |
| 296 | | .symbol_count_hint = options.symbol_count_hint, |
| 297 | | .program_code_size_hint = options.program_code_size_hint, |
| 298 | | }); |
| 182 | const d_sym_file = try d_sym_bundle.createFile(emit.sub_path, .{ |
| 183 | .truncate = false, |
| 184 | .read = true, |
| 185 | }); |
| 299 | 186 | |
| 300 | | if (self.d_sym) |*d_sym| { |
| 301 | | try d_sym.populateMissingMetadata(self); |
| 187 | self.d_sym = .{ |
| 188 | .allocator = gpa, |
| 189 | .dwarf = link.File.Dwarf.init(&self.base, .dwarf32), |
| 190 | .file = d_sym_file, |
| 191 | }; |
| 192 | } |
| 193 | } |
| 302 | 194 | } |
| 303 | 195 | |
| 304 | 196 | return self; |
| ... | ... | @@ -316,26 +208,8 @@ pub fn open( |
| 316 | 208 | } |
| 317 | 209 | |
| 318 | 210 | pub fn flush(self: *MachO, arena: Allocator, prog_node: *std.Progress.Node) link.File.FlushError!void { |
| 319 | | const comp = self.base.comp; |
| 320 | | const gpa = comp.gpa; |
| 321 | | const output_mode = comp.config.output_mode; |
| 322 | | |
| 323 | | if (output_mode == .Lib and comp.config.link_mode == .Static) { |
| 324 | | if (build_options.have_llvm) { |
| 325 | | return self.base.linkAsArchive(arena, prog_node); |
| 326 | | } else { |
| 327 | | try comp.link_errors.ensureUnusedCapacity(gpa, 1); |
| 328 | | comp.link_errors.appendAssumeCapacity(.{ |
| 329 | | .msg = try gpa.dupe(u8, "TODO: non-LLVM archiver for MachO object files"), |
| 330 | | }); |
| 331 | | return error.FlushFailure; |
| 332 | | } |
| 333 | | } |
| 334 | | |
| 335 | | switch (self.mode) { |
| 336 | | .zld => return zld.linkWithZld(self, arena, prog_node), |
| 337 | | .incremental => return self.flushModule(arena, prog_node), |
| 338 | | } |
| 211 | // TODO: what else should we do in flush? Is it actually needed at all? |
| 212 | try self.flushModule(arena, prog_node); |
| 339 | 213 | } |
| 340 | 214 | |
| 341 | 215 | pub fn flushModule(self: *MachO, arena: Allocator, prog_node: *std.Progress.Node) link.File.FlushError!void { |
| ... | ... | @@ -344,261 +218,40 @@ pub fn flushModule(self: *MachO, arena: Allocator, prog_node: *std.Progress.Node |
| 344 | 218 | |
| 345 | 219 | const comp = self.base.comp; |
| 346 | 220 | const gpa = comp.gpa; |
| 221 | _ = gpa; |
| 347 | 222 | |
| 348 | 223 | if (self.llvm_object) |llvm_object| { |
| 349 | 224 | try self.base.emitLlvmObject(arena, llvm_object, prog_node); |
| 350 | | return; |
| 351 | 225 | } |
| 352 | 226 | |
| 353 | 227 | var sub_prog_node = prog_node.start("MachO Flush", 0); |
| 354 | 228 | sub_prog_node.activate(); |
| 355 | 229 | defer sub_prog_node.end(); |
| 356 | 230 | |
| 357 | | const output_mode = comp.config.output_mode; |
| 358 | | const module = comp.module orelse return error.LinkingWithoutZigSourceUnimplemented; |
| 359 | 231 | const target = comp.root_mod.resolved_target.result; |
| 360 | | |
| 361 | | if (self.lazy_syms.getPtr(.none)) |metadata| { |
| 362 | | // Most lazy symbols can be updated on first use, but |
| 363 | | // anyerror needs to wait for everything to be flushed. |
| 364 | | if (metadata.text_state != .unused) self.updateLazySymbolAtom( |
| 365 | | File.LazySymbol.initDecl(.code, null, module), |
| 366 | | metadata.text_atom, |
| 367 | | self.text_section_index.?, |
| 368 | | ) catch |err| return switch (err) { |
| 369 | | error.CodegenFail => error.FlushFailure, |
| 370 | | else => |e| e, |
| 371 | | }; |
| 372 | | if (metadata.data_const_state != .unused) self.updateLazySymbolAtom( |
| 373 | | File.LazySymbol.initDecl(.const_data, null, module), |
| 374 | | metadata.data_const_atom, |
| 375 | | self.data_const_section_index.?, |
| 376 | | ) catch |err| return switch (err) { |
| 377 | | error.CodegenFail => error.FlushFailure, |
| 378 | | else => |e| e, |
| 379 | | }; |
| 380 | | } |
| 381 | | for (self.lazy_syms.values()) |*metadata| { |
| 382 | | if (metadata.text_state != .unused) metadata.text_state = .flushed; |
| 383 | | if (metadata.data_const_state != .unused) metadata.data_const_state = .flushed; |
| 384 | | } |
| 385 | | |
| 386 | | if (self.d_sym) |*d_sym| { |
| 387 | | try d_sym.dwarf.flushModule(module); |
| 388 | | } |
| 389 | | |
| 390 | | var libs = std.StringArrayHashMap(link.SystemLib).init(arena); |
| 391 | | try self.resolveLibSystem(arena, comp, &libs); |
| 392 | | |
| 393 | | self.base.releaseLock(); |
| 394 | | |
| 395 | | for (self.dylibs.items) |*dylib| { |
| 396 | | dylib.deinit(gpa); |
| 397 | | } |
| 398 | | self.dylibs.clearRetainingCapacity(); |
| 399 | | self.dylibs_map.clearRetainingCapacity(); |
| 400 | | self.referenced_dylibs.clearRetainingCapacity(); |
| 401 | | |
| 402 | | var dependent_libs = std.fifo.LinearFifo(DylibReExportInfo, .Dynamic).init(arena); |
| 403 | | |
| 404 | | for (libs.keys(), libs.values()) |path, lib| { |
| 405 | | const in_file = try std.fs.cwd().openFile(path, .{}); |
| 406 | | defer in_file.close(); |
| 407 | | |
| 408 | | var parse_ctx = ParseErrorCtx.init(gpa); |
| 409 | | defer parse_ctx.deinit(); |
| 410 | | |
| 411 | | self.parseLibrary( |
| 412 | | in_file, |
| 413 | | path, |
| 414 | | lib, |
| 415 | | false, |
| 416 | | false, |
| 417 | | null, |
| 418 | | &dependent_libs, |
| 419 | | &parse_ctx, |
| 420 | | ) catch |err| try self.handleAndReportParseError(path, err, &parse_ctx); |
| 421 | | } |
| 422 | | |
| 423 | | try self.parseDependentLibs(&dependent_libs); |
| 424 | | |
| 425 | | try self.resolveSymbols(); |
| 426 | | |
| 427 | | if (self.getEntryPoint() == null) { |
| 428 | | comp.link_error_flags.no_entry_point_found = true; |
| 429 | | } |
| 430 | | if (self.unresolved.count() > 0) { |
| 431 | | try self.reportUndefined(); |
| 432 | | return error.FlushFailure; |
| 433 | | } |
| 434 | | |
| 435 | | { |
| 436 | | var it = self.actions.iterator(); |
| 437 | | while (it.next()) |entry| { |
| 438 | | const global_index = entry.key_ptr.*; |
| 439 | | const global = self.globals.items[global_index]; |
| 440 | | const flags = entry.value_ptr.*; |
| 441 | | if (flags.add_got) try self.addGotEntry(global); |
| 442 | | if (flags.add_stub) try self.addStubEntry(global); |
| 443 | | } |
| 444 | | } |
| 445 | | |
| 446 | | try self.createDyldPrivateAtom(); |
| 447 | | try self.writeStubHelperPreamble(); |
| 448 | | |
| 449 | | if (output_mode == .Exe and self.getEntryPoint() != null) { |
| 450 | | const global = self.getEntryPoint().?; |
| 451 | | if (self.getSymbol(global).undf()) { |
| 452 | | // We do one additional check here in case the entry point was found in one of the dylibs. |
| 453 | | // (I actually have no idea what this would imply but it is a possible outcome and so we |
| 454 | | // support it.) |
| 455 | | try self.addStubEntry(global); |
| 456 | | } |
| 457 | | } |
| 458 | | |
| 459 | | try self.allocateSpecialSymbols(); |
| 460 | | |
| 461 | | for (self.relocs.keys()) |atom_index| { |
| 462 | | const relocs = self.relocs.get(atom_index).?; |
| 463 | | const needs_update = for (relocs.items) |reloc| { |
| 464 | | if (reloc.dirty) break true; |
| 465 | | } else false; |
| 466 | | |
| 467 | | if (!needs_update) continue; |
| 468 | | |
| 469 | | const atom = self.getAtom(atom_index); |
| 470 | | const sym = atom.getSymbol(self); |
| 471 | | const section = self.sections.get(sym.n_sect - 1).header; |
| 472 | | const file_offset = section.offset + sym.n_value - section.addr; |
| 473 | | |
| 474 | | var code = std.ArrayList(u8).init(gpa); |
| 475 | | defer code.deinit(); |
| 476 | | try code.resize(math.cast(usize, atom.size) orelse return error.Overflow); |
| 477 | | |
| 478 | | const amt = try self.base.file.?.preadAll(code.items, file_offset); |
| 479 | | if (amt != code.items.len) return error.InputOutput; |
| 480 | | |
| 481 | | try self.writeAtom(atom_index, code.items); |
| 482 | | } |
| 483 | | |
| 484 | | // Update GOT if it got moved in memory. |
| 485 | | if (self.got_table_contents_dirty) { |
| 486 | | for (self.got_table.entries.items, 0..) |entry, i| { |
| 487 | | if (!self.got_table.lookup.contains(entry)) continue; |
| 488 | | // TODO: write all in one go rather than incrementally. |
| 489 | | try self.writeOffsetTableEntry(i); |
| 490 | | } |
| 491 | | self.got_table_contents_dirty = false; |
| 492 | | } |
| 493 | | |
| 494 | | // Update stubs if we moved any section in memory. |
| 495 | | // TODO: we probably don't need to update all sections if only one got moved. |
| 496 | | if (self.stub_table_contents_dirty) { |
| 497 | | for (self.stub_table.entries.items, 0..) |entry, i| { |
| 498 | | if (!self.stub_table.lookup.contains(entry)) continue; |
| 499 | | // TODO: write all in one go rather than incrementally. |
| 500 | | try self.writeStubTableEntry(i); |
| 501 | | } |
| 502 | | self.stub_table_contents_dirty = false; |
| 503 | | } |
| 504 | | |
| 505 | | if (build_options.enable_logging) { |
| 506 | | self.logSymtab(); |
| 507 | | self.logSections(); |
| 508 | | self.logAtoms(); |
| 509 | | } |
| 510 | | |
| 511 | | try self.writeLinkeditSegmentData(); |
| 512 | | |
| 513 | | var codesig: ?CodeSignature = if (self.requiresCodeSignature()) blk: { |
| 514 | | // Preallocate space for the code signature. |
| 515 | | // We need to do this at this stage so that we have the load commands with proper values |
| 516 | | // written out to the file. |
| 517 | | // The most important here is to have the correct vm and filesize of the __LINKEDIT segment |
| 518 | | // where the code signature goes into. |
| 519 | | var codesig = CodeSignature.init(getPageSize(target.cpu.arch)); |
| 520 | | codesig.code_directory.ident = self.base.emit.sub_path; |
| 521 | | if (self.entitlements) |path| { |
| 522 | | try codesig.addEntitlements(gpa, path); |
| 232 | _ = target; |
| 233 | const directory = self.base.emit.directory; |
| 234 | const full_out_path = try directory.join(arena, &[_][]const u8{self.base.emit.sub_path}); |
| 235 | const module_obj_path: ?[]const u8 = if (self.base.zcu_object_sub_path) |path| blk: { |
| 236 | if (fs.path.dirname(full_out_path)) |dirname| { |
| 237 | break :blk try fs.path.join(arena, &.{ dirname, path }); |
| 238 | } else { |
| 239 | break :blk path; |
| 523 | 240 | } |
| 524 | | try self.writeCodeSignaturePadding(&codesig); |
| 525 | | break :blk codesig; |
| 526 | 241 | } else null; |
| 527 | | defer if (codesig) |*csig| csig.deinit(gpa); |
| 528 | | |
| 529 | | // Write load commands |
| 530 | | var lc_buffer = std.ArrayList(u8).init(arena); |
| 531 | | const lc_writer = lc_buffer.writer(); |
| 532 | | |
| 533 | | try self.writeSegmentHeaders(lc_writer); |
| 534 | | try lc_writer.writeStruct(self.dyld_info_cmd); |
| 535 | | try lc_writer.writeStruct(self.symtab_cmd); |
| 536 | | try lc_writer.writeStruct(self.dysymtab_cmd); |
| 537 | | try load_commands.writeDylinkerLC(lc_writer); |
| 538 | | |
| 539 | | switch (output_mode) { |
| 540 | | .Exe => blk: { |
| 541 | | const seg_id = self.header_segment_cmd_index.?; |
| 542 | | const seg = self.segments.items[seg_id]; |
| 543 | | const global = self.getEntryPoint() orelse break :blk; |
| 544 | | const sym = self.getSymbol(global); |
| 545 | | |
| 546 | | const addr: u64 = if (sym.undf()) |
| 547 | | // In this case, the symbol has been resolved in one of dylibs and so we point |
| 548 | | // to the stub as its vmaddr value. |
| 549 | | self.getStubsEntryAddress(global).? |
| 550 | | else |
| 551 | | sym.n_value; |
| 552 | | |
| 553 | | try lc_writer.writeStruct(macho.entry_point_command{ |
| 554 | | .entryoff = @as(u32, @intCast(addr - seg.vmaddr)), |
| 555 | | .stacksize = self.base.stack_size, |
| 556 | | }); |
| 557 | | }, |
| 558 | | .Lib => if (comp.config.link_mode == .Dynamic) { |
| 559 | | try load_commands.writeDylibIdLC(self, lc_writer); |
| 560 | | }, |
| 561 | | else => {}, |
| 562 | | } |
| 242 | _ = module_obj_path; |
| 563 | 243 | |
| 564 | | try load_commands.writeRpathLCs(self, lc_writer); |
| 565 | | try lc_writer.writeStruct(macho.source_version_command{ |
| 566 | | .version = 0, |
| 567 | | }); |
| 568 | | { |
| 569 | | const platform = Platform.fromTarget(target); |
| 570 | | const sdk_version: ?std.SemanticVersion = load_commands.inferSdkVersion(self); |
| 571 | | if (platform.isBuildVersionCompatible()) { |
| 572 | | try load_commands.writeBuildVersionLC(platform, sdk_version, lc_writer); |
| 573 | | } else if (platform.isVersionMinCompatible()) { |
| 574 | | try load_commands.writeVersionMinLC(platform, sdk_version, lc_writer); |
| 575 | | } |
| 576 | | } |
| 577 | | |
| 578 | | const uuid_cmd_offset = @sizeOf(macho.mach_header_64) + @as(u32, @intCast(lc_buffer.items.len)); |
| 579 | | try lc_writer.writeStruct(self.uuid_cmd); |
| 580 | | |
| 581 | | try load_commands.writeLoadDylibLCs(self.dylibs.items, self.referenced_dylibs.keys(), lc_writer); |
| 582 | | |
| 583 | | if (codesig != null) { |
| 584 | | try lc_writer.writeStruct(self.codesig_cmd); |
| 585 | | } |
| 244 | // --verbose-link |
| 245 | if (comp.verbose_link) try self.dumpArgv(comp); |
| 586 | 246 | |
| 587 | | const ncmds = load_commands.calcNumOfLCs(lc_buffer.items); |
| 588 | | try self.base.file.?.pwriteAll(lc_buffer.items, @sizeOf(macho.mach_header_64)); |
| 589 | | try self.writeHeader(ncmds, @as(u32, @intCast(lc_buffer.items.len))); |
| 590 | | try self.writeUuid(comp, uuid_cmd_offset, codesig != null); |
| 591 | | |
| 592 | | if (codesig) |*csig| { |
| 593 | | try self.writeCodeSignature(comp, csig); // code signing always comes last |
| 594 | | const emit = self.base.emit; |
| 595 | | try invalidateKernelCache(emit.directory.handle, emit.sub_path); |
| 596 | | } |
| 247 | @panic("TODO"); |
| 248 | } |
| 597 | 249 | |
| 598 | | if (self.d_sym) |*d_sym| { |
| 599 | | // Flush debug symbols bundle. |
| 600 | | try d_sym.flushModule(self); |
| 601 | | } |
| 250 | /// --verbose-link output |
| 251 | fn dumpArgv(self: *MachO, comp: *Compilation) !void { |
| 252 | _ = self; |
| 253 | _ = comp; |
| 254 | @panic("TODO dumpArgv"); |
| 602 | 255 | } |
| 603 | 256 | |
| 604 | 257 | /// XNU starting with Big Sur running on arm64 is caching inodes of running binaries. |
| ... | ... | @@ -726,4441 +379,338 @@ pub fn parsePositional( |
| 726 | 379 | const tracy = trace(@src()); |
| 727 | 380 | defer tracy.end(); |
| 728 | 381 | |
| 729 | | if (Object.isObject(file)) { |
| 730 | | try self.parseObject(file, path, ctx); |
| 731 | | } else { |
| 732 | | try self.parseLibrary(file, path, .{ |
| 733 | | .path = null, |
| 734 | | .needed = false, |
| 735 | | .weak = false, |
| 736 | | }, must_link, false, null, dependent_libs, ctx); |
| 737 | | } |
| 382 | _ = self; |
| 383 | _ = file; |
| 384 | _ = path; |
| 385 | _ = must_link; |
| 386 | _ = dependent_libs; |
| 387 | _ = ctx; |
| 738 | 388 | } |
| 739 | 389 | |
| 740 | | fn parseObject( |
| 741 | | self: *MachO, |
| 742 | | file: std.fs.File, |
| 743 | | path: []const u8, |
| 744 | | ctx: *ParseErrorCtx, |
| 745 | | ) ParseError!void { |
| 746 | | const tracy = trace(@src()); |
| 747 | | defer tracy.end(); |
| 748 | | |
| 390 | pub fn deinit(self: *MachO) void { |
| 749 | 391 | const gpa = self.base.comp.gpa; |
| 750 | | const target = self.base.comp.root_mod.resolved_target.result; |
| 751 | | const mtime: u64 = mtime: { |
| 752 | | const stat = file.stat() catch break :mtime 0; |
| 753 | | break :mtime @as(u64, @intCast(@divFloor(stat.mtime, 1_000_000_000))); |
| 754 | | }; |
| 755 | | const file_stat = try file.stat(); |
| 756 | | const file_size = math.cast(usize, file_stat.size) orelse return error.Overflow; |
| 757 | | const contents = try file.readToEndAllocOptions(gpa, file_size, file_size, @alignOf(u64), null); |
| 758 | | |
| 759 | | var object = Object{ |
| 760 | | .name = try gpa.dupe(u8, path), |
| 761 | | .mtime = mtime, |
| 762 | | .contents = contents, |
| 763 | | }; |
| 764 | | errdefer object.deinit(gpa); |
| 765 | | try object.parse(gpa); |
| 766 | 392 | |
| 767 | | const detected_cpu_arch: std.Target.Cpu.Arch = switch (object.header.cputype) { |
| 768 | | macho.CPU_TYPE_ARM64 => .aarch64, |
| 769 | | macho.CPU_TYPE_X86_64 => .x86_64, |
| 770 | | else => unreachable, |
| 771 | | }; |
| 772 | | const detected_platform = object.getPlatform(); |
| 773 | | const this_cpu_arch = target.cpu.arch; |
| 774 | | const this_platform = Platform.fromTarget(target); |
| 393 | if (self.llvm_object) |llvm_object| llvm_object.deinit(); |
| 775 | 394 | |
| 776 | | if (this_cpu_arch != detected_cpu_arch or |
| 777 | | (detected_platform != null and !detected_platform.?.eqlTarget(this_platform))) |
| 778 | | { |
| 779 | | const platform = detected_platform orelse this_platform; |
| 780 | | try ctx.detected_targets.append(try platform.allocPrintTarget(ctx.arena(), detected_cpu_arch)); |
| 781 | | return error.InvalidTarget; |
| 395 | if (self.d_sym) |*d_sym| { |
| 396 | d_sym.deinit(); |
| 782 | 397 | } |
| 783 | 398 | |
| 784 | | try self.objects.append(gpa, object); |
| 785 | | } |
| 786 | | |
| 787 | | pub fn parseLibrary( |
| 788 | | self: *MachO, |
| 789 | | file: std.fs.File, |
| 790 | | path: []const u8, |
| 791 | | lib: link.SystemLib, |
| 792 | | must_link: bool, |
| 793 | | is_dependent: bool, |
| 794 | | reexport_info: ?DylibReExportInfo, |
| 795 | | dependent_libs: anytype, |
| 796 | | ctx: *ParseErrorCtx, |
| 797 | | ) ParseError!void { |
| 798 | | const tracy = trace(@src()); |
| 799 | | defer tracy.end(); |
| 399 | self.strtab.deinit(gpa); |
| 800 | 400 | |
| 801 | | const target = self.base.comp.root_mod.resolved_target.result; |
| 401 | self.segments.deinit(gpa); |
| 802 | 402 | |
| 803 | | if (fat.isFatLibrary(file)) { |
| 804 | | const offset = try self.parseFatLibrary(file, target.cpu.arch, ctx); |
| 805 | | try file.seekTo(offset); |
| 806 | | |
| 807 | | if (Archive.isArchive(file, offset)) { |
| 808 | | try self.parseArchive(path, offset, must_link, ctx); |
| 809 | | } else if (Dylib.isDylib(file, offset)) { |
| 810 | | try self.parseDylib(file, path, offset, dependent_libs, .{ |
| 811 | | .needed = lib.needed, |
| 812 | | .weak = lib.weak, |
| 813 | | .dependent = is_dependent, |
| 814 | | .reexport_info = reexport_info, |
| 815 | | }, ctx); |
| 816 | | } else return error.UnknownFileType; |
| 817 | | } else if (Archive.isArchive(file, 0)) { |
| 818 | | try self.parseArchive(path, 0, must_link, ctx); |
| 819 | | } else if (Dylib.isDylib(file, 0)) { |
| 820 | | try self.parseDylib(file, path, 0, dependent_libs, .{ |
| 821 | | .needed = lib.needed, |
| 822 | | .weak = lib.weak, |
| 823 | | .dependent = is_dependent, |
| 824 | | .reexport_info = reexport_info, |
| 825 | | }, ctx); |
| 826 | | } else { |
| 827 | | self.parseLibStub(file, path, dependent_libs, .{ |
| 828 | | .needed = lib.needed, |
| 829 | | .weak = lib.weak, |
| 830 | | .dependent = is_dependent, |
| 831 | | .reexport_info = reexport_info, |
| 832 | | }, ctx) catch |err| switch (err) { |
| 833 | | error.NotLibStub, error.UnexpectedToken => return error.UnknownFileType, |
| 834 | | else => |e| return e, |
| 835 | | }; |
| 403 | for (self.sections.items(.free_list)) |*list| { |
| 404 | list.deinit(gpa); |
| 836 | 405 | } |
| 406 | self.sections.deinit(gpa); |
| 837 | 407 | } |
| 838 | 408 | |
| 839 | | pub fn parseFatLibrary( |
| 840 | | self: *MachO, |
| 841 | | file: std.fs.File, |
| 842 | | cpu_arch: std.Target.Cpu.Arch, |
| 843 | | ctx: *ParseErrorCtx, |
| 844 | | ) ParseError!u64 { |
| 409 | fn freeAtom(self: *MachO, atom_index: Atom.Index) void { |
| 845 | 410 | const gpa = self.base.comp.gpa; |
| 411 | log.debug("freeAtom {d}", .{atom_index}); |
| 846 | 412 | |
| 847 | | const fat_archs = try fat.parseArchs(gpa, file); |
| 848 | | defer gpa.free(fat_archs); |
| 413 | // Remove any relocs and base relocs associated with this Atom |
| 414 | Atom.freeRelocations(self, atom_index); |
| 849 | 415 | |
| 850 | | const offset = for (fat_archs) |arch| { |
| 851 | | if (arch.tag == cpu_arch) break arch.offset; |
| 852 | | } else { |
| 853 | | try ctx.detected_targets.ensureUnusedCapacity(fat_archs.len); |
| 854 | | for (fat_archs) |arch| { |
| 855 | | ctx.detected_targets.appendAssumeCapacity(try ctx.arena().dupe(u8, @tagName(arch.tag))); |
| 416 | const atom = self.getAtom(atom_index); |
| 417 | const sect_id = atom.getSymbol(self).n_sect - 1; |
| 418 | const free_list = &self.sections.items(.free_list)[sect_id]; |
| 419 | var already_have_free_list_node = false; |
| 420 | { |
| 421 | var i: usize = 0; |
| 422 | // TODO turn free_list into a hash map |
| 423 | while (i < free_list.items.len) { |
| 424 | if (free_list.items[i] == atom_index) { |
| 425 | _ = free_list.swapRemove(i); |
| 426 | continue; |
| 427 | } |
| 428 | if (free_list.items[i] == atom.prev_index) { |
| 429 | already_have_free_list_node = true; |
| 430 | } |
| 431 | i += 1; |
| 856 | 432 | } |
| 857 | | return error.InvalidTargetFatLibrary; |
| 858 | | }; |
| 859 | | return offset; |
| 860 | | } |
| 861 | | |
| 862 | | fn parseArchive( |
| 863 | | self: *MachO, |
| 864 | | path: []const u8, |
| 865 | | fat_offset: u64, |
| 866 | | must_link: bool, |
| 867 | | ctx: *ParseErrorCtx, |
| 868 | | ) ParseError!void { |
| 869 | | const gpa = self.base.comp.gpa; |
| 870 | | const target = self.base.comp.root_mod.resolved_target.result; |
| 871 | | |
| 872 | | // We take ownership of the file so that we can store it for the duration of symbol resolution. |
| 873 | | // TODO we shouldn't need to do that and could pre-parse the archive like we do for zld/ELF? |
| 874 | | const file = try std.fs.cwd().openFile(path, .{}); |
| 875 | | try file.seekTo(fat_offset); |
| 876 | | |
| 877 | | var archive = Archive{ |
| 878 | | .file = file, |
| 879 | | .fat_offset = fat_offset, |
| 880 | | .name = try gpa.dupe(u8, path), |
| 881 | | }; |
| 882 | | errdefer archive.deinit(gpa); |
| 433 | } |
| 883 | 434 | |
| 884 | | try archive.parse(gpa, file.reader()); |
| 435 | const maybe_last_atom_index = &self.sections.items(.last_atom_index)[sect_id]; |
| 436 | if (maybe_last_atom_index.*) |last_atom_index| { |
| 437 | if (last_atom_index == atom_index) { |
| 438 | if (atom.prev_index) |prev_index| { |
| 439 | // TODO shrink the section size here |
| 440 | maybe_last_atom_index.* = prev_index; |
| 441 | } else { |
| 442 | maybe_last_atom_index.* = null; |
| 443 | } |
| 444 | } |
| 445 | } |
| 885 | 446 | |
| 886 | | // Verify arch and platform |
| 887 | | if (archive.toc.values().len > 0) { |
| 888 | | const offsets = archive.toc.values()[0].items; |
| 889 | | assert(offsets.len > 0); |
| 890 | | const off = offsets[0]; |
| 891 | | var object = try archive.parseObject(gpa, off); // TODO we are doing all this work to pull the header only! |
| 892 | | defer object.deinit(gpa); |
| 447 | if (atom.prev_index) |prev_index| { |
| 448 | const prev = self.getAtomPtr(prev_index); |
| 449 | prev.next_index = atom.next_index; |
| 893 | 450 | |
| 894 | | const detected_cpu_arch: std.Target.Cpu.Arch = switch (object.header.cputype) { |
| 895 | | macho.CPU_TYPE_ARM64 => .aarch64, |
| 896 | | macho.CPU_TYPE_X86_64 => .x86_64, |
| 897 | | else => unreachable, |
| 898 | | }; |
| 899 | | const detected_platform = object.getPlatform(); |
| 900 | | const this_cpu_arch = target.cpu.arch; |
| 901 | | const this_platform = Platform.fromTarget(target); |
| 902 | | |
| 903 | | if (this_cpu_arch != detected_cpu_arch or |
| 904 | | (detected_platform != null and !detected_platform.?.eqlTarget(this_platform))) |
| 905 | | { |
| 906 | | const platform = detected_platform orelse this_platform; |
| 907 | | try ctx.detected_targets.append(try platform.allocPrintTarget(gpa, detected_cpu_arch)); |
| 908 | | return error.InvalidTarget; |
| 451 | if (!already_have_free_list_node and prev.*.freeListEligible(self)) { |
| 452 | // The free list is heuristics, it doesn't have to be perfect, so we can ignore |
| 453 | // the OOM here. |
| 454 | free_list.append(gpa, prev_index) catch {}; |
| 909 | 455 | } |
| 456 | } else { |
| 457 | self.getAtomPtr(atom_index).prev_index = null; |
| 910 | 458 | } |
| 911 | 459 | |
| 912 | | if (must_link) { |
| 913 | | // Get all offsets from the ToC |
| 914 | | var offsets = std.AutoArrayHashMap(u32, void).init(gpa); |
| 915 | | defer offsets.deinit(); |
| 916 | | for (archive.toc.values()) |offs| { |
| 917 | | for (offs.items) |off| { |
| 918 | | _ = try offsets.getOrPut(off); |
| 919 | | } |
| 920 | | } |
| 921 | | for (offsets.keys()) |off| { |
| 922 | | const object = try archive.parseObject(gpa, off); |
| 923 | | try self.objects.append(gpa, object); |
| 924 | | } |
| 460 | if (atom.next_index) |next_index| { |
| 461 | self.getAtomPtr(next_index).prev_index = atom.prev_index; |
| 925 | 462 | } else { |
| 926 | | try self.archives.append(gpa, archive); |
| 463 | self.getAtomPtr(atom_index).next_index = null; |
| 927 | 464 | } |
| 928 | | } |
| 929 | 465 | |
| 930 | | pub const DylibReExportInfo = struct { |
| 931 | | id: Dylib.Id, |
| 932 | | parent: u16, |
| 933 | | }; |
| 466 | // Appending to free lists is allowed to fail because the free lists are heuristics based anyway. |
| 467 | const sym_index = atom.getSymbolIndex().?; |
| 934 | 468 | |
| 935 | | const DylibOpts = struct { |
| 936 | | reexport_info: ?DylibReExportInfo = null, |
| 937 | | dependent: bool = false, |
| 938 | | needed: bool = false, |
| 939 | | weak: bool = false, |
| 940 | | }; |
| 469 | self.locals_free_list.append(gpa, sym_index) catch {}; |
| 941 | 470 | |
| 942 | | fn parseDylib( |
| 943 | | self: *MachO, |
| 944 | | file: std.fs.File, |
| 945 | | path: []const u8, |
| 946 | | offset: u64, |
| 947 | | dependent_libs: anytype, |
| 948 | | dylib_options: DylibOpts, |
| 949 | | ctx: *ParseErrorCtx, |
| 950 | | ) ParseError!void { |
| 951 | | const gpa = self.base.comp.gpa; |
| 952 | | const target = self.base.comp.root_mod.resolved_target.result; |
| 953 | | const file_stat = try file.stat(); |
| 954 | | const file_size = math.cast(usize, file_stat.size - offset) orelse return error.Overflow; |
| 955 | | |
| 956 | | const contents = try file.readToEndAllocOptions(gpa, file_size, file_size, @alignOf(u64), null); |
| 957 | | defer gpa.free(contents); |
| 958 | | |
| 959 | | var dylib = Dylib{ .path = try gpa.dupe(u8, path), .weak = dylib_options.weak }; |
| 960 | | errdefer dylib.deinit(gpa); |
| 961 | | |
| 962 | | try dylib.parseFromBinary( |
| 963 | | gpa, |
| 964 | | @intCast(self.dylibs.items.len), // TODO defer it till later |
| 965 | | dependent_libs, |
| 966 | | path, |
| 967 | | contents, |
| 968 | | ); |
| 969 | | |
| 970 | | const detected_cpu_arch: std.Target.Cpu.Arch = switch (dylib.header.?.cputype) { |
| 971 | | macho.CPU_TYPE_ARM64 => .aarch64, |
| 972 | | macho.CPU_TYPE_X86_64 => .x86_64, |
| 973 | | else => unreachable, |
| 974 | | }; |
| 975 | | const detected_platform = dylib.getPlatform(contents); |
| 976 | | const this_cpu_arch = target.cpu.arch; |
| 977 | | const this_platform = Platform.fromTarget(target); |
| 471 | // Try freeing GOT atom if this decl had one |
| 472 | self.got_table.freeEntry(gpa, .{ .sym_index = sym_index }); |
| 978 | 473 | |
| 979 | | if (this_cpu_arch != detected_cpu_arch or |
| 980 | | (detected_platform != null and !detected_platform.?.eqlTarget(this_platform))) |
| 981 | | { |
| 982 | | const platform = detected_platform orelse this_platform; |
| 983 | | try ctx.detected_targets.append(try platform.allocPrintTarget(ctx.arena(), detected_cpu_arch)); |
| 984 | | return error.InvalidTarget; |
| 474 | if (self.d_sym) |*d_sym| { |
| 475 | d_sym.swapRemoveRelocs(sym_index); |
| 985 | 476 | } |
| 986 | 477 | |
| 987 | | try self.addDylib(dylib, dylib_options, ctx); |
| 478 | self.locals.items[sym_index].n_type = 0; |
| 479 | _ = self.atom_by_index_table.remove(sym_index); |
| 480 | log.debug(" adding local symbol index {d} to free list", .{sym_index}); |
| 481 | self.getAtomPtr(atom_index).sym_index = 0; |
| 988 | 482 | } |
| 989 | 483 | |
| 990 | | fn parseLibStub( |
| 991 | | self: *MachO, |
| 992 | | file: std.fs.File, |
| 993 | | path: []const u8, |
| 994 | | dependent_libs: anytype, |
| 995 | | dylib_options: DylibOpts, |
| 996 | | ctx: *ParseErrorCtx, |
| 997 | | ) ParseError!void { |
| 998 | | const gpa = self.base.comp.gpa; |
| 999 | | const target = self.base.comp.root_mod.resolved_target.result; |
| 1000 | | |
| 1001 | | var lib_stub = try LibStub.loadFromFile(gpa, file); |
| 1002 | | defer lib_stub.deinit(); |
| 1003 | | |
| 1004 | | if (lib_stub.inner.len == 0) return error.NotLibStub; |
| 1005 | | |
| 1006 | | // Verify target |
| 1007 | | { |
| 1008 | | var matcher = try Dylib.TargetMatcher.init(gpa, target); |
| 1009 | | defer matcher.deinit(); |
| 1010 | | |
| 1011 | | const first_tbd = lib_stub.inner[0]; |
| 1012 | | const targets = try first_tbd.targets(gpa); |
| 1013 | | defer { |
| 1014 | | for (targets) |t| gpa.free(t); |
| 1015 | | gpa.free(targets); |
| 1016 | | } |
| 1017 | | if (!matcher.matchesTarget(targets)) { |
| 1018 | | try ctx.detected_targets.ensureUnusedCapacity(targets.len); |
| 1019 | | for (targets) |t| { |
| 1020 | | ctx.detected_targets.appendAssumeCapacity(try ctx.arena().dupe(u8, t)); |
| 1021 | | } |
| 1022 | | return error.InvalidTarget; |
| 1023 | | } |
| 1024 | | } |
| 1025 | | |
| 1026 | | var dylib = Dylib{ .path = try gpa.dupe(u8, path), .weak = dylib_options.weak }; |
| 1027 | | errdefer dylib.deinit(gpa); |
| 1028 | | |
| 1029 | | try dylib.parseFromStub( |
| 1030 | | gpa, |
| 1031 | | target, |
| 1032 | | lib_stub, |
| 1033 | | @intCast(self.dylibs.items.len), // TODO defer it till later |
| 1034 | | dependent_libs, |
| 1035 | | path, |
| 1036 | | ); |
| 1037 | | |
| 1038 | | try self.addDylib(dylib, dylib_options, ctx); |
| 1039 | | } |
| 1040 | | |
| 1041 | | fn addDylib(self: *MachO, dylib: Dylib, dylib_options: DylibOpts, ctx: *ParseErrorCtx) ParseError!void { |
| 1042 | | if (dylib_options.reexport_info) |reexport_info| { |
| 1043 | | if (dylib.id.?.current_version < reexport_info.id.compatibility_version) { |
| 1044 | | ctx.detected_dylib_id = .{ |
| 1045 | | .parent = reexport_info.parent, |
| 1046 | | .required_version = reexport_info.id.compatibility_version, |
| 1047 | | .found_version = dylib.id.?.current_version, |
| 1048 | | }; |
| 1049 | | return error.IncompatibleDylibVersion; |
| 1050 | | } |
| 1051 | | } |
| 1052 | | |
| 1053 | | const gpa = self.base.comp.gpa; |
| 1054 | | const gop = try self.dylibs_map.getOrPut(gpa, dylib.id.?.name); |
| 1055 | | if (gop.found_existing) return error.DylibAlreadyExists; |
| 1056 | | |
| 1057 | | gop.value_ptr.* = @as(u16, @intCast(self.dylibs.items.len)); |
| 1058 | | try self.dylibs.append(gpa, dylib); |
| 1059 | | |
| 1060 | | const should_link_dylib_even_if_unreachable = blk: { |
| 1061 | | if (self.dead_strip_dylibs and !dylib_options.needed) break :blk false; |
| 1062 | | break :blk !(dylib_options.dependent or self.referenced_dylibs.contains(gop.value_ptr.*)); |
| 1063 | | }; |
| 1064 | | |
| 1065 | | if (should_link_dylib_even_if_unreachable) { |
| 1066 | | try self.referenced_dylibs.putNoClobber(gpa, gop.value_ptr.*, {}); |
| 1067 | | } |
| 1068 | | } |
| 1069 | | |
| 1070 | | pub fn parseDependentLibs(self: *MachO, dependent_libs: anytype) !void { |
| 1071 | | const tracy = trace(@src()); |
| 1072 | | defer tracy.end(); |
| 1073 | | |
| 1074 | | // At this point, we can now parse dependents of dylibs preserving the inclusion order of: |
| 1075 | | // 1) anything on the linker line is parsed first |
| 1076 | | // 2) afterwards, we parse dependents of the included dylibs |
| 1077 | | // TODO this should not be performed if the user specifies `-flat_namespace` flag. |
| 1078 | | // See ld64 manpages. |
| 1079 | | const comp = self.base.comp; |
| 1080 | | const gpa = comp.gpa; |
| 1081 | | |
| 1082 | | while (dependent_libs.readItem()) |dep_id| { |
| 1083 | | defer dep_id.id.deinit(gpa); |
| 1084 | | |
| 1085 | | if (self.dylibs_map.contains(dep_id.id.name)) continue; |
| 1086 | | |
| 1087 | | const parent = &self.dylibs.items[dep_id.parent]; |
| 1088 | | const weak = parent.weak; |
| 1089 | | const dirname = fs.path.dirname(dep_id.id.name) orelse ""; |
| 1090 | | const stem = fs.path.stem(dep_id.id.name); |
| 1091 | | |
| 1092 | | var arena_allocator = std.heap.ArenaAllocator.init(gpa); |
| 1093 | | defer arena_allocator.deinit(); |
| 1094 | | const arena = arena_allocator.allocator(); |
| 1095 | | |
| 1096 | | var test_path = std.ArrayList(u8).init(arena); |
| 1097 | | var checked_paths = std.ArrayList([]const u8).init(arena); |
| 1098 | | |
| 1099 | | success: { |
| 1100 | | if (comp.sysroot) |root| { |
| 1101 | | const dir = try fs.path.join(arena, &[_][]const u8{ root, dirname }); |
| 1102 | | if (try accessLibPath(gpa, &test_path, &checked_paths, dir, stem)) break :success; |
| 1103 | | } |
| 1104 | | |
| 1105 | | if (try accessLibPath(gpa, &test_path, &checked_paths, dirname, stem)) break :success; |
| 1106 | | |
| 1107 | | try self.reportMissingLibraryError( |
| 1108 | | checked_paths.items, |
| 1109 | | "missing dynamic library dependency: '{s}'", |
| 1110 | | .{dep_id.id.name}, |
| 1111 | | ); |
| 1112 | | continue; |
| 1113 | | } |
| 1114 | | |
| 1115 | | const full_path = test_path.items; |
| 1116 | | const file = try std.fs.cwd().openFile(full_path, .{}); |
| 1117 | | defer file.close(); |
| 1118 | | |
| 1119 | | log.debug("parsing dependency {s} at fully resolved path {s}", .{ dep_id.id.name, full_path }); |
| 1120 | | |
| 1121 | | var parse_ctx = ParseErrorCtx.init(gpa); |
| 1122 | | defer parse_ctx.deinit(); |
| 1123 | | |
| 1124 | | self.parseLibrary(file, full_path, .{ |
| 1125 | | .path = null, |
| 1126 | | .needed = false, |
| 1127 | | .weak = weak, |
| 1128 | | }, false, true, dep_id, dependent_libs, &parse_ctx) catch |err| |
| 1129 | | try self.handleAndReportParseError(full_path, err, &parse_ctx); |
| 1130 | | |
| 1131 | | // TODO I think that it would be nice to rewrite this error to include metadata for failed dependency |
| 1132 | | // in addition to parsing error |
| 1133 | | } |
| 1134 | | } |
| 1135 | | |
| 1136 | | pub fn writeAtom(self: *MachO, atom_index: Atom.Index, code: []u8) !void { |
| 1137 | | const atom = self.getAtom(atom_index); |
| 1138 | | const sym = atom.getSymbol(self); |
| 1139 | | const section = self.sections.get(sym.n_sect - 1); |
| 1140 | | const file_offset = section.header.offset + sym.n_value - section.header.addr; |
| 1141 | | log.debug("writing atom for symbol {s} at file offset 0x{x}", .{ atom.getName(self), file_offset }); |
| 1142 | | |
| 1143 | | // Gather relocs which can be resolved. |
| 1144 | | const gpa = self.base.comp.gpa; |
| 1145 | | var relocs = std.ArrayList(*Relocation).init(gpa); |
| 1146 | | defer relocs.deinit(); |
| 1147 | | |
| 1148 | | if (self.relocs.getPtr(atom_index)) |rels| { |
| 1149 | | try relocs.ensureTotalCapacityPrecise(rels.items.len); |
| 1150 | | for (rels.items) |*reloc| { |
| 1151 | | if (reloc.isResolvable(self) and reloc.dirty) { |
| 1152 | | relocs.appendAssumeCapacity(reloc); |
| 1153 | | } |
| 1154 | | } |
| 1155 | | } |
| 1156 | | |
| 1157 | | Atom.resolveRelocations(self, atom_index, relocs.items, code); |
| 1158 | | |
| 1159 | | if (is_hot_update_compatible) { |
| 1160 | | if (self.hot_state.mach_task) |task| { |
| 1161 | | self.writeToMemory(task, section.segment_index, sym.n_value, code) catch |err| { |
| 1162 | | log.warn("cannot hot swap: writing to memory failed: {s}", .{@errorName(err)}); |
| 1163 | | }; |
| 1164 | | } |
| 1165 | | } |
| 1166 | | |
| 1167 | | try self.base.file.?.pwriteAll(code, file_offset); |
| 1168 | | |
| 1169 | | // Now we can mark the relocs as resolved. |
| 1170 | | while (relocs.popOrNull()) |reloc| { |
| 1171 | | reloc.dirty = false; |
| 1172 | | } |
| 1173 | | } |
| 1174 | | |
| 1175 | | fn writeToMemory(self: *MachO, task: std.os.darwin.MachTask, segment_index: u8, addr: u64, code: []const u8) !void { |
| 1176 | | const segment = self.segments.items[segment_index]; |
| 1177 | | const target = self.base.comp.root_mod.resolved_target.result; |
| 1178 | | const cpu_arch = target.cpu.arch; |
| 1179 | | const nwritten = if (!segment.isWriteable()) |
| 1180 | | try task.writeMemProtected(addr, code, cpu_arch) |
| 1181 | | else |
| 1182 | | try task.writeMem(addr, code, cpu_arch); |
| 1183 | | if (nwritten != code.len) return error.InputOutput; |
| 1184 | | } |
| 1185 | | |
| 1186 | | fn writeOffsetTableEntry(self: *MachO, index: usize) !void { |
| 1187 | | const sect_id = self.got_section_index.?; |
| 1188 | | |
| 1189 | | if (self.got_table_count_dirty) { |
| 1190 | | const needed_size = self.got_table.entries.items.len * @sizeOf(u64); |
| 1191 | | try self.growSection(sect_id, needed_size); |
| 1192 | | self.got_table_count_dirty = false; |
| 1193 | | } |
| 1194 | | |
| 1195 | | const header = &self.sections.items(.header)[sect_id]; |
| 1196 | | const segment_index = self.sections.items(.segment_index)[sect_id]; |
| 1197 | | const entry = self.got_table.entries.items[index]; |
| 1198 | | const entry_value = self.getSymbol(entry).n_value; |
| 1199 | | const entry_offset = index * @sizeOf(u64); |
| 1200 | | const file_offset = header.offset + entry_offset; |
| 1201 | | const vmaddr = header.addr + entry_offset; |
| 1202 | | |
| 1203 | | log.debug("writing GOT entry {d}: @{x} => {x}", .{ index, vmaddr, entry_value }); |
| 1204 | | |
| 1205 | | var buf: [@sizeOf(u64)]u8 = undefined; |
| 1206 | | mem.writeInt(u64, &buf, entry_value, .little); |
| 1207 | | try self.base.file.?.pwriteAll(&buf, file_offset); |
| 1208 | | |
| 1209 | | if (is_hot_update_compatible) { |
| 1210 | | if (self.hot_state.mach_task) |task| { |
| 1211 | | self.writeToMemory(task, segment_index, vmaddr, &buf) catch |err| { |
| 1212 | | log.warn("cannot hot swap: writing to memory failed: {s}", .{@errorName(err)}); |
| 1213 | | }; |
| 1214 | | } |
| 1215 | | } |
| 1216 | | } |
| 1217 | | |
| 1218 | | fn writeStubHelperPreamble(self: *MachO) !void { |
| 1219 | | if (self.stub_helper_preamble_allocated) return; |
| 1220 | | |
| 1221 | | const gpa = self.base.comp.gpa; |
| 1222 | | const target = self.base.comp.root_mod.resolved_target.result; |
| 1223 | | const cpu_arch = target.cpu.arch; |
| 1224 | | const size = stubs.stubHelperPreambleSize(cpu_arch); |
| 1225 | | |
| 1226 | | var buf = try std.ArrayList(u8).initCapacity(gpa, size); |
| 1227 | | defer buf.deinit(); |
| 1228 | | |
| 1229 | | const dyld_private_addr = self.getAtom(self.dyld_private_atom_index.?).getSymbol(self).n_value; |
| 1230 | | const dyld_stub_binder_got_addr = blk: { |
| 1231 | | const index = self.got_table.lookup.get(self.getGlobalByIndex(self.dyld_stub_binder_index.?)).?; |
| 1232 | | const header = self.sections.items(.header)[self.got_section_index.?]; |
| 1233 | | break :blk header.addr + @sizeOf(u64) * index; |
| 1234 | | }; |
| 1235 | | const header = self.sections.items(.header)[self.stub_helper_section_index.?]; |
| 1236 | | |
| 1237 | | try stubs.writeStubHelperPreambleCode(.{ |
| 1238 | | .cpu_arch = cpu_arch, |
| 1239 | | .source_addr = header.addr, |
| 1240 | | .dyld_private_addr = dyld_private_addr, |
| 1241 | | .dyld_stub_binder_got_addr = dyld_stub_binder_got_addr, |
| 1242 | | }, buf.writer()); |
| 1243 | | try self.base.file.?.pwriteAll(buf.items, header.offset); |
| 1244 | | |
| 1245 | | self.stub_helper_preamble_allocated = true; |
| 1246 | | } |
| 1247 | | |
| 1248 | | fn writeStubTableEntry(self: *MachO, index: usize) !void { |
| 1249 | | const target = self.base.comp.root_mod.resolved_target.result; |
| 1250 | | const stubs_sect_id = self.stubs_section_index.?; |
| 1251 | | const stub_helper_sect_id = self.stub_helper_section_index.?; |
| 1252 | | const laptr_sect_id = self.la_symbol_ptr_section_index.?; |
| 1253 | | |
| 1254 | | const cpu_arch = target.cpu.arch; |
| 1255 | | const stub_entry_size = stubs.stubSize(cpu_arch); |
| 1256 | | const stub_helper_entry_size = stubs.stubHelperSize(cpu_arch); |
| 1257 | | const stub_helper_preamble_size = stubs.stubHelperPreambleSize(cpu_arch); |
| 1258 | | |
| 1259 | | if (self.stub_table_count_dirty) { |
| 1260 | | // We grow all 3 sections one by one. |
| 1261 | | { |
| 1262 | | const needed_size = stub_entry_size * self.stub_table.entries.items.len; |
| 1263 | | try self.growSection(stubs_sect_id, needed_size); |
| 1264 | | } |
| 1265 | | { |
| 1266 | | const needed_size = stub_helper_preamble_size + stub_helper_entry_size * self.stub_table.entries.items.len; |
| 1267 | | try self.growSection(stub_helper_sect_id, needed_size); |
| 1268 | | } |
| 1269 | | { |
| 1270 | | const needed_size = @sizeOf(u64) * self.stub_table.entries.items.len; |
| 1271 | | try self.growSection(laptr_sect_id, needed_size); |
| 1272 | | } |
| 1273 | | self.stub_table_count_dirty = false; |
| 1274 | | } |
| 1275 | | |
| 1276 | | const gpa = self.base.comp.gpa; |
| 1277 | | |
| 1278 | | const stubs_header = self.sections.items(.header)[stubs_sect_id]; |
| 1279 | | const stub_helper_header = self.sections.items(.header)[stub_helper_sect_id]; |
| 1280 | | const laptr_header = self.sections.items(.header)[laptr_sect_id]; |
| 1281 | | |
| 1282 | | const entry = self.stub_table.entries.items[index]; |
| 1283 | | const stub_addr: u64 = stubs_header.addr + stub_entry_size * index; |
| 1284 | | const stub_helper_addr: u64 = stub_helper_header.addr + stub_helper_preamble_size + stub_helper_entry_size * index; |
| 1285 | | const laptr_addr: u64 = laptr_header.addr + @sizeOf(u64) * index; |
| 1286 | | |
| 1287 | | log.debug("writing stub entry {d}: @{x} => '{s}'", .{ index, stub_addr, self.getSymbolName(entry) }); |
| 1288 | | |
| 1289 | | { |
| 1290 | | var buf = try std.ArrayList(u8).initCapacity(gpa, stub_entry_size); |
| 1291 | | defer buf.deinit(); |
| 1292 | | try stubs.writeStubCode(.{ |
| 1293 | | .cpu_arch = cpu_arch, |
| 1294 | | .source_addr = stub_addr, |
| 1295 | | .target_addr = laptr_addr, |
| 1296 | | }, buf.writer()); |
| 1297 | | const off = stubs_header.offset + stub_entry_size * index; |
| 1298 | | try self.base.file.?.pwriteAll(buf.items, off); |
| 1299 | | } |
| 1300 | | |
| 1301 | | { |
| 1302 | | var buf = try std.ArrayList(u8).initCapacity(gpa, stub_helper_entry_size); |
| 1303 | | defer buf.deinit(); |
| 1304 | | try stubs.writeStubHelperCode(.{ |
| 1305 | | .cpu_arch = cpu_arch, |
| 1306 | | .source_addr = stub_helper_addr, |
| 1307 | | .target_addr = stub_helper_header.addr, |
| 1308 | | }, buf.writer()); |
| 1309 | | const off = stub_helper_header.offset + stub_helper_preamble_size + stub_helper_entry_size * index; |
| 1310 | | try self.base.file.?.pwriteAll(buf.items, off); |
| 1311 | | } |
| 1312 | | |
| 1313 | | { |
| 1314 | | var buf: [@sizeOf(u64)]u8 = undefined; |
| 1315 | | mem.writeInt(u64, &buf, stub_helper_addr, .little); |
| 1316 | | const off = laptr_header.offset + @sizeOf(u64) * index; |
| 1317 | | try self.base.file.?.pwriteAll(&buf, off); |
| 1318 | | } |
| 1319 | | |
| 1320 | | // TODO: generating new stub entry will require pulling the address of the symbol from the |
| 1321 | | // target dylib when updating directly in memory. |
| 1322 | | if (is_hot_update_compatible) { |
| 1323 | | if (self.hot_state.mach_task) |_| { |
| 1324 | | @panic("TODO: update a stub entry in memory"); |
| 1325 | | } |
| 1326 | | } |
| 1327 | | } |
| 1328 | | |
| 1329 | | fn markRelocsDirtyByTarget(self: *MachO, target: SymbolWithLoc) void { |
| 1330 | | log.debug("marking relocs dirty by target: {}", .{target}); |
| 1331 | | // TODO: reverse-lookup might come in handy here |
| 1332 | | for (self.relocs.values()) |*relocs| { |
| 1333 | | for (relocs.items) |*reloc| { |
| 1334 | | if (!reloc.target.eql(target)) continue; |
| 1335 | | reloc.dirty = true; |
| 1336 | | } |
| 1337 | | } |
| 1338 | | } |
| 1339 | | |
| 1340 | | fn markRelocsDirtyByAddress(self: *MachO, addr: u64) void { |
| 1341 | | log.debug("marking relocs dirty by address: {x}", .{addr}); |
| 1342 | | |
| 1343 | | const got_moved = blk: { |
| 1344 | | const sect_id = self.got_section_index orelse break :blk false; |
| 1345 | | break :blk self.sections.items(.header)[sect_id].addr > addr; |
| 1346 | | }; |
| 1347 | | const stubs_moved = blk: { |
| 1348 | | const sect_id = self.stubs_section_index orelse break :blk false; |
| 1349 | | break :blk self.sections.items(.header)[sect_id].addr > addr; |
| 1350 | | }; |
| 1351 | | |
| 1352 | | for (self.relocs.values()) |*relocs| { |
| 1353 | | for (relocs.items) |*reloc| { |
| 1354 | | if (reloc.isGotIndirection()) { |
| 1355 | | reloc.dirty = reloc.dirty or got_moved; |
| 1356 | | } else if (reloc.isStubTrampoline(self)) { |
| 1357 | | reloc.dirty = reloc.dirty or stubs_moved; |
| 1358 | | } else { |
| 1359 | | const target_addr = reloc.getTargetBaseAddress(self) orelse continue; |
| 1360 | | if (target_addr > addr) reloc.dirty = true; |
| 1361 | | } |
| 1362 | | } |
| 1363 | | } |
| 1364 | | |
| 1365 | | // TODO: dirty only really affected GOT cells |
| 1366 | | for (self.got_table.entries.items) |entry| { |
| 1367 | | const target_addr = self.getSymbol(entry).n_value; |
| 1368 | | if (target_addr > addr) { |
| 1369 | | self.got_table_contents_dirty = true; |
| 1370 | | break; |
| 1371 | | } |
| 1372 | | } |
| 1373 | | |
| 1374 | | { |
| 1375 | | const stubs_addr = self.getSegment(self.stubs_section_index.?).vmaddr; |
| 1376 | | const stub_helper_addr = self.getSegment(self.stub_helper_section_index.?).vmaddr; |
| 1377 | | const laptr_addr = self.getSegment(self.la_symbol_ptr_section_index.?).vmaddr; |
| 1378 | | if (stubs_addr > addr or stub_helper_addr > addr or laptr_addr > addr) |
| 1379 | | self.stub_table_contents_dirty = true; |
| 1380 | | } |
| 1381 | | } |
| 1382 | | |
| 1383 | | pub fn allocateSpecialSymbols(self: *MachO) !void { |
| 1384 | | for (&[_][]const u8{ |
| 1385 | | "___dso_handle", |
| 1386 | | "__mh_execute_header", |
| 1387 | | }) |name| { |
| 1388 | | const global = self.getGlobal(name) orelse continue; |
| 1389 | | if (global.getFile() != null) continue; |
| 1390 | | const sym = self.getSymbolPtr(global); |
| 1391 | | const seg = self.getSegment(self.text_section_index.?); |
| 1392 | | sym.n_sect = self.text_section_index.? + 1; |
| 1393 | | sym.n_value = seg.vmaddr; |
| 1394 | | |
| 1395 | | log.debug("allocating {s}(@0x{x},sect({d})) at the start of {s}", .{ |
| 1396 | | name, |
| 1397 | | sym.n_value, |
| 1398 | | sym.n_sect, |
| 1399 | | seg.segName(), |
| 1400 | | }); |
| 1401 | | } |
| 1402 | | |
| 1403 | | for (self.globals.items) |global| { |
| 1404 | | const sym = self.getSymbolPtr(global); |
| 1405 | | if (sym.n_desc != N_BOUNDARY) continue; |
| 1406 | | if (self.getSectionBoundarySymbol(global)) |bsym| { |
| 1407 | | const sect_id = self.getSectionByName(bsym.segname, bsym.sectname) orelse { |
| 1408 | | try self.reportUnresolvedBoundarySymbol(self.getSymbolName(global), "section not found: {s},{s}", .{ |
| 1409 | | bsym.segname, bsym.sectname, |
| 1410 | | }); |
| 1411 | | continue; |
| 1412 | | }; |
| 1413 | | const sect = self.sections.items(.header)[sect_id]; |
| 1414 | | sym.n_sect = sect_id + 1; |
| 1415 | | sym.n_value = switch (bsym.kind) { |
| 1416 | | .start => sect.addr, |
| 1417 | | .stop => sect.addr + sect.size, |
| 1418 | | }; |
| 1419 | | |
| 1420 | | log.debug("allocating {s} at @0x{x} sect({d})", .{ |
| 1421 | | self.getSymbolName(global), |
| 1422 | | sym.n_value, |
| 1423 | | sym.n_sect, |
| 1424 | | }); |
| 1425 | | |
| 1426 | | continue; |
| 1427 | | } |
| 1428 | | if (self.getSegmentBoundarySymbol(global)) |bsym| { |
| 1429 | | const seg_id = self.getSegmentByName(bsym.segname) orelse { |
| 1430 | | try self.reportUnresolvedBoundarySymbol(self.getSymbolName(global), "segment not found: {s}", .{ |
| 1431 | | bsym.segname, |
| 1432 | | }); |
| 1433 | | |
| 1434 | | continue; |
| 1435 | | }; |
| 1436 | | const seg = self.segments.items[seg_id]; |
| 1437 | | sym.n_value = switch (bsym.kind) { |
| 1438 | | .start => seg.vmaddr, |
| 1439 | | .stop => seg.vmaddr + seg.vmsize, |
| 1440 | | }; |
| 1441 | | |
| 1442 | | log.debug("allocating {s} at @0x{x} ", .{ self.getSymbolName(global), sym.n_value }); |
| 1443 | | |
| 1444 | | continue; |
| 1445 | | } |
| 1446 | | } |
| 1447 | | } |
| 1448 | | |
| 1449 | | const CreateAtomOpts = struct { |
| 1450 | | size: u64 = 0, |
| 1451 | | alignment: Alignment = .@"1", |
| 1452 | | }; |
| 1453 | | |
| 1454 | | pub fn createAtom(self: *MachO, sym_index: u32, opts: CreateAtomOpts) !Atom.Index { |
| 1455 | | const gpa = self.base.comp.gpa; |
| 1456 | | const index = @as(Atom.Index, @intCast(self.atoms.items.len)); |
| 1457 | | const atom = try self.atoms.addOne(gpa); |
| 1458 | | atom.* = .{}; |
| 1459 | | atom.sym_index = sym_index; |
| 1460 | | atom.size = opts.size; |
| 1461 | | atom.alignment = opts.alignment; |
| 1462 | | log.debug("creating ATOM(%{d}) at index {d}", .{ sym_index, index }); |
| 1463 | | return index; |
| 1464 | | } |
| 1465 | | |
| 1466 | | pub fn createTentativeDefAtoms(self: *MachO) !void { |
| 1467 | | const gpa = self.base.comp.gpa; |
| 1468 | | |
| 1469 | | for (self.globals.items) |global| { |
| 1470 | | const sym = self.getSymbolPtr(global); |
| 1471 | | if (!sym.tentative()) continue; |
| 1472 | | if (sym.n_desc == N_DEAD) continue; |
| 1473 | | if (sym.n_desc == N_BOUNDARY) continue; |
| 1474 | | |
| 1475 | | log.debug("creating tentative definition for ATOM(%{d}, '{s}') in object({?})", .{ |
| 1476 | | global.sym_index, self.getSymbolName(global), global.file, |
| 1477 | | }); |
| 1478 | | |
| 1479 | | // Convert any tentative definition into a regular symbol and allocate |
| 1480 | | // text blocks for each tentative definition. |
| 1481 | | const size = sym.n_value; |
| 1482 | | const alignment = (sym.n_desc >> 8) & 0x0f; |
| 1483 | | |
| 1484 | | if (self.bss_section_index == null) { |
| 1485 | | self.bss_section_index = try self.initSection("__DATA", "__bss", .{ |
| 1486 | | .flags = macho.S_ZEROFILL, |
| 1487 | | }); |
| 1488 | | } |
| 1489 | | |
| 1490 | | sym.* = .{ |
| 1491 | | .n_strx = sym.n_strx, |
| 1492 | | .n_type = macho.N_SECT | macho.N_EXT, |
| 1493 | | .n_sect = self.bss_section_index.? + 1, |
| 1494 | | .n_desc = 0, |
| 1495 | | .n_value = 0, |
| 1496 | | }; |
| 1497 | | |
| 1498 | | const atom_index = try self.createAtom(global.sym_index, .{ |
| 1499 | | .size = size, |
| 1500 | | .alignment = @enumFromInt(alignment), |
| 1501 | | }); |
| 1502 | | const atom = self.getAtomPtr(atom_index); |
| 1503 | | atom.file = global.file; |
| 1504 | | |
| 1505 | | self.addAtomToSection(atom_index); |
| 1506 | | |
| 1507 | | assert(global.getFile() != null); |
| 1508 | | const object = &self.objects.items[global.getFile().?]; |
| 1509 | | try object.atoms.append(gpa, atom_index); |
| 1510 | | object.atom_by_index_table[global.sym_index] = atom_index; |
| 1511 | | } |
| 1512 | | } |
| 1513 | | |
| 1514 | | pub fn createDyldPrivateAtom(self: *MachO) !void { |
| 1515 | | if (self.dyld_private_atom_index != null) return; |
| 1516 | | |
| 1517 | | const sym_index = try self.allocateSymbol(); |
| 1518 | | const atom_index = try self.createAtom(sym_index, .{ |
| 1519 | | .size = @sizeOf(u64), |
| 1520 | | .alignment = .@"8", |
| 1521 | | }); |
| 1522 | | const gpa = self.base.comp.gpa; |
| 1523 | | try self.atom_by_index_table.putNoClobber(gpa, sym_index, atom_index); |
| 1524 | | |
| 1525 | | if (self.data_section_index == null) { |
| 1526 | | self.data_section_index = try self.initSection("__DATA", "__data", .{}); |
| 1527 | | } |
| 1528 | | |
| 1529 | | const atom = self.getAtom(atom_index); |
| 1530 | | const sym = atom.getSymbolPtr(self); |
| 1531 | | sym.n_type = macho.N_SECT; |
| 1532 | | sym.n_sect = self.data_section_index.? + 1; |
| 1533 | | self.dyld_private_atom_index = atom_index; |
| 1534 | | |
| 1535 | | switch (self.mode) { |
| 1536 | | .zld => self.addAtomToSection(atom_index), |
| 1537 | | .incremental => { |
| 1538 | | sym.n_value = try self.allocateAtom(atom_index, atom.size, .@"8"); |
| 1539 | | log.debug("allocated dyld_private atom at 0x{x}", .{sym.n_value}); |
| 1540 | | var buffer: [@sizeOf(u64)]u8 = [_]u8{0} ** @sizeOf(u64); |
| 1541 | | try self.writeAtom(atom_index, &buffer); |
| 1542 | | }, |
| 1543 | | } |
| 1544 | | } |
| 1545 | | |
| 1546 | | fn createThreadLocalDescriptorAtom(self: *MachO, sym_name: []const u8, target: SymbolWithLoc) !Atom.Index { |
| 1547 | | const gpa = self.base.comp.gpa; |
| 1548 | | const size = 3 * @sizeOf(u64); |
| 1549 | | const required_alignment: Alignment = .@"1"; |
| 1550 | | const sym_index = try self.allocateSymbol(); |
| 1551 | | const atom_index = try self.createAtom(sym_index, .{}); |
| 1552 | | try self.atom_by_index_table.putNoClobber(gpa, sym_index, atom_index); |
| 1553 | | self.getAtomPtr(atom_index).size = size; |
| 1554 | | |
| 1555 | | const sym = self.getAtom(atom_index).getSymbolPtr(self); |
| 1556 | | sym.n_type = macho.N_SECT; |
| 1557 | | sym.n_sect = self.thread_vars_section_index.? + 1; |
| 1558 | | sym.n_strx = try self.strtab.insert(gpa, sym_name); |
| 1559 | | sym.n_value = try self.allocateAtom(atom_index, size, required_alignment); |
| 1560 | | |
| 1561 | | log.debug("allocated threadlocal descriptor atom '{s}' at 0x{x}", .{ sym_name, sym.n_value }); |
| 1562 | | |
| 1563 | | try Atom.addRelocation(self, atom_index, .{ |
| 1564 | | .type = .tlv_initializer, |
| 1565 | | .target = target, |
| 1566 | | .offset = 0x10, |
| 1567 | | .addend = 0, |
| 1568 | | .pcrel = false, |
| 1569 | | .length = 3, |
| 1570 | | }); |
| 1571 | | |
| 1572 | | var code: [size]u8 = undefined; |
| 1573 | | @memset(&code, 0); |
| 1574 | | try self.writeAtom(atom_index, &code); |
| 1575 | | |
| 1576 | | return atom_index; |
| 1577 | | } |
| 1578 | | |
| 1579 | | pub fn createMhExecuteHeaderSymbol(self: *MachO) !void { |
| 1580 | | const output_mode = self.base.comp.config.output_mode; |
| 1581 | | if (output_mode != .Exe) return; |
| 1582 | | |
| 1583 | | const gpa = self.base.comp.gpa; |
| 1584 | | const sym_index = try self.allocateSymbol(); |
| 1585 | | const sym_loc = SymbolWithLoc{ .sym_index = sym_index }; |
| 1586 | | const sym = self.getSymbolPtr(sym_loc); |
| 1587 | | sym.* = .{ |
| 1588 | | .n_strx = try self.strtab.insert(gpa, "__mh_execute_header"), |
| 1589 | | .n_type = macho.N_SECT | macho.N_EXT, |
| 1590 | | .n_sect = 0, |
| 1591 | | .n_desc = macho.REFERENCED_DYNAMICALLY, |
| 1592 | | .n_value = 0, |
| 1593 | | }; |
| 1594 | | |
| 1595 | | const gop = try self.getOrPutGlobalPtr("__mh_execute_header"); |
| 1596 | | if (gop.found_existing) { |
| 1597 | | const global = gop.value_ptr.*; |
| 1598 | | if (global.getFile()) |file| { |
| 1599 | | const global_object = &self.objects.items[file]; |
| 1600 | | global_object.globals_lookup[global.sym_index] = self.getGlobalIndex("__mh_execute_header").?; |
| 1601 | | } |
| 1602 | | } |
| 1603 | | gop.value_ptr.* = sym_loc; |
| 1604 | | } |
| 1605 | | |
| 1606 | | pub fn createDsoHandleSymbol(self: *MachO) !void { |
| 1607 | | const global = self.getGlobalPtr("___dso_handle") orelse return; |
| 1608 | | if (!self.getSymbol(global.*).undf()) return; |
| 1609 | | |
| 1610 | | const gpa = self.base.comp.gpa; |
| 1611 | | const sym_index = try self.allocateSymbol(); |
| 1612 | | const sym_loc = SymbolWithLoc{ .sym_index = sym_index }; |
| 1613 | | const sym = self.getSymbolPtr(sym_loc); |
| 1614 | | sym.* = .{ |
| 1615 | | .n_strx = try self.strtab.insert(gpa, "___dso_handle"), |
| 1616 | | .n_type = macho.N_SECT | macho.N_EXT, |
| 1617 | | .n_sect = 0, |
| 1618 | | .n_desc = macho.N_WEAK_DEF, |
| 1619 | | .n_value = 0, |
| 1620 | | }; |
| 1621 | | const global_index = self.getGlobalIndex("___dso_handle").?; |
| 1622 | | if (global.getFile()) |file| { |
| 1623 | | const global_object = &self.objects.items[file]; |
| 1624 | | global_object.globals_lookup[global.sym_index] = global_index; |
| 1625 | | } |
| 1626 | | global.* = sym_loc; |
| 1627 | | _ = self.unresolved.swapRemove(self.getGlobalIndex("___dso_handle").?); |
| 1628 | | } |
| 1629 | | |
| 1630 | | pub fn resolveSymbols(self: *MachO) !void { |
| 1631 | | const comp = self.base.comp; |
| 1632 | | const output_mode = comp.config.output_mode; |
| 1633 | | // We add the specified entrypoint as the first unresolved symbols so that |
| 1634 | | // we search for it in libraries should there be no object files specified |
| 1635 | | // on the linker line. |
| 1636 | | if (output_mode == .Exe) { |
| 1637 | | if (self.entry_name) |entry_name| { |
| 1638 | | _ = try self.addUndefined(entry_name, .{}); |
| 1639 | | } |
| 1640 | | } |
| 1641 | | |
| 1642 | | // Force resolution of any symbols requested by the user. |
| 1643 | | for (comp.force_undefined_symbols.keys()) |sym_name| { |
| 1644 | | _ = try self.addUndefined(sym_name, .{}); |
| 1645 | | } |
| 1646 | | |
| 1647 | | for (self.objects.items, 0..) |_, object_id| { |
| 1648 | | try self.resolveSymbolsInObject(@as(u32, @intCast(object_id))); |
| 1649 | | } |
| 1650 | | |
| 1651 | | try self.resolveSymbolsInArchives(); |
| 1652 | | |
| 1653 | | // Finally, force resolution of dyld_stub_binder if there are imports |
| 1654 | | // requested. |
| 1655 | | if (self.unresolved.count() > 0 and self.dyld_stub_binder_index == null) { |
| 1656 | | self.dyld_stub_binder_index = try self.addUndefined("dyld_stub_binder", .{ .add_got = true }); |
| 1657 | | } |
| 1658 | | if (comp.config.any_non_single_threaded and self.mode == .incremental) { |
| 1659 | | _ = try self.addUndefined("__tlv_bootstrap", .{}); |
| 1660 | | } |
| 1661 | | |
| 1662 | | try self.resolveSymbolsInDylibs(); |
| 1663 | | |
| 1664 | | try self.createMhExecuteHeaderSymbol(); |
| 1665 | | try self.createDsoHandleSymbol(); |
| 1666 | | try self.resolveSymbolsAtLoading(); |
| 1667 | | |
| 1668 | | // Final stop, check if unresolved contain any of the special magic boundary symbols |
| 1669 | | // * section$start$ |
| 1670 | | // * section$stop$ |
| 1671 | | // * segment$start$ |
| 1672 | | // * segment$stop$ |
| 1673 | | try self.resolveBoundarySymbols(); |
| 1674 | | } |
| 1675 | | |
| 1676 | | fn resolveGlobalSymbol(self: *MachO, current: SymbolWithLoc) !void { |
| 1677 | | const gpa = self.base.comp.gpa; |
| 1678 | | const sym = self.getSymbol(current); |
| 1679 | | const sym_name = self.getSymbolName(current); |
| 1680 | | |
| 1681 | | const gop = try self.getOrPutGlobalPtr(sym_name); |
| 1682 | | if (!gop.found_existing) { |
| 1683 | | gop.value_ptr.* = current; |
| 1684 | | if (sym.undf() and !sym.tentative()) { |
| 1685 | | try self.unresolved.putNoClobber(gpa, self.getGlobalIndex(sym_name).?, {}); |
| 1686 | | } |
| 1687 | | return; |
| 1688 | | } |
| 1689 | | const global_index = self.getGlobalIndex(sym_name).?; |
| 1690 | | const global = gop.value_ptr.*; |
| 1691 | | const global_sym = self.getSymbol(global); |
| 1692 | | |
| 1693 | | // Cases to consider: sym vs global_sym |
| 1694 | | // 1. strong(sym) and strong(global_sym) => error |
| 1695 | | // 2. strong(sym) and weak(global_sym) => sym |
| 1696 | | // 3. strong(sym) and tentative(global_sym) => sym |
| 1697 | | // 4. strong(sym) and undf(global_sym) => sym |
| 1698 | | // 5. weak(sym) and strong(global_sym) => global_sym |
| 1699 | | // 6. weak(sym) and tentative(global_sym) => sym |
| 1700 | | // 7. weak(sym) and undf(global_sym) => sym |
| 1701 | | // 8. tentative(sym) and strong(global_sym) => global_sym |
| 1702 | | // 9. tentative(sym) and weak(global_sym) => global_sym |
| 1703 | | // 10. tentative(sym) and tentative(global_sym) => pick larger |
| 1704 | | // 11. tentative(sym) and undf(global_sym) => sym |
| 1705 | | // 12. undf(sym) and * => global_sym |
| 1706 | | // |
| 1707 | | // Reduces to: |
| 1708 | | // 1. strong(sym) and strong(global_sym) => error |
| 1709 | | // 2. * and strong(global_sym) => global_sym |
| 1710 | | // 3. weak(sym) and weak(global_sym) => global_sym |
| 1711 | | // 4. tentative(sym) and tentative(global_sym) => pick larger |
| 1712 | | // 5. undf(sym) and * => global_sym |
| 1713 | | // 6. else => sym |
| 1714 | | |
| 1715 | | const sym_is_strong = sym.sect() and !(sym.weakDef() or sym.pext()); |
| 1716 | | const global_is_strong = global_sym.sect() and !(global_sym.weakDef() or global_sym.pext()); |
| 1717 | | const sym_is_weak = sym.sect() and (sym.weakDef() or sym.pext()); |
| 1718 | | const global_is_weak = global_sym.sect() and (global_sym.weakDef() or global_sym.pext()); |
| 1719 | | |
| 1720 | | if (sym_is_strong and global_is_strong) { |
| 1721 | | // TODO redo this logic with corresponding logic in updateExports to avoid this |
| 1722 | | // ugly check. |
| 1723 | | if (self.mode == .zld) { |
| 1724 | | try self.reportSymbolCollision(global, current); |
| 1725 | | } |
| 1726 | | return error.MultipleSymbolDefinitions; |
| 1727 | | } |
| 1728 | | |
| 1729 | | if (current.getFile()) |file| { |
| 1730 | | const object = &self.objects.items[file]; |
| 1731 | | object.globals_lookup[current.sym_index] = global_index; |
| 1732 | | } |
| 1733 | | |
| 1734 | | if (global_is_strong) return; |
| 1735 | | if (sym_is_weak and global_is_weak) return; |
| 1736 | | if (sym.tentative() and global_sym.tentative()) { |
| 1737 | | if (global_sym.n_value >= sym.n_value) return; |
| 1738 | | } |
| 1739 | | if (sym.undf() and !sym.tentative()) return; |
| 1740 | | |
| 1741 | | if (global.getFile()) |file| { |
| 1742 | | const global_object = &self.objects.items[file]; |
| 1743 | | global_object.globals_lookup[global.sym_index] = global_index; |
| 1744 | | } |
| 1745 | | _ = self.unresolved.swapRemove(global_index); |
| 1746 | | |
| 1747 | | gop.value_ptr.* = current; |
| 1748 | | } |
| 1749 | | |
| 1750 | | fn resolveSymbolsInObject(self: *MachO, object_id: u32) !void { |
| 1751 | | const object = &self.objects.items[object_id]; |
| 1752 | | const in_symtab = object.in_symtab orelse return; |
| 1753 | | |
| 1754 | | log.debug("resolving symbols in '{s}'", .{object.name}); |
| 1755 | | |
| 1756 | | var sym_index: u32 = 0; |
| 1757 | | while (sym_index < in_symtab.len) : (sym_index += 1) { |
| 1758 | | const sym = &object.symtab[sym_index]; |
| 1759 | | const sym_name = object.getSymbolName(sym_index); |
| 1760 | | const sym_with_loc = SymbolWithLoc{ |
| 1761 | | .sym_index = sym_index, |
| 1762 | | .file = object_id + 1, |
| 1763 | | }; |
| 1764 | | |
| 1765 | | if (sym.stab() or sym.indr() or sym.abs()) { |
| 1766 | | try self.reportUnhandledSymbolType(sym_with_loc); |
| 1767 | | continue; |
| 1768 | | } |
| 1769 | | |
| 1770 | | if (sym.sect() and !sym.ext()) { |
| 1771 | | log.debug("symbol '{s}' local to object {s}; skipping...", .{ |
| 1772 | | sym_name, |
| 1773 | | object.name, |
| 1774 | | }); |
| 1775 | | continue; |
| 1776 | | } |
| 1777 | | |
| 1778 | | self.resolveGlobalSymbol(.{ |
| 1779 | | .sym_index = sym_index, |
| 1780 | | .file = object_id + 1, |
| 1781 | | }) catch |err| switch (err) { |
| 1782 | | error.MultipleSymbolDefinitions => return error.FlushFailure, |
| 1783 | | else => |e| return e, |
| 1784 | | }; |
| 1785 | | } |
| 1786 | | } |
| 1787 | | |
| 1788 | | fn resolveSymbolsInArchives(self: *MachO) !void { |
| 1789 | | if (self.archives.items.len == 0) return; |
| 1790 | | |
| 1791 | | const gpa = self.base.comp.gpa; |
| 1792 | | var next_sym: usize = 0; |
| 1793 | | loop: while (next_sym < self.unresolved.count()) { |
| 1794 | | const global = self.globals.items[self.unresolved.keys()[next_sym]]; |
| 1795 | | const sym_name = self.getSymbolName(global); |
| 1796 | | |
| 1797 | | for (self.archives.items) |archive| { |
| 1798 | | // Check if the entry exists in a static archive. |
| 1799 | | const offsets = archive.toc.get(sym_name) orelse { |
| 1800 | | // No hit. |
| 1801 | | continue; |
| 1802 | | }; |
| 1803 | | assert(offsets.items.len > 0); |
| 1804 | | |
| 1805 | | const object_id = @as(u16, @intCast(self.objects.items.len)); |
| 1806 | | const object = try archive.parseObject(gpa, offsets.items[0]); |
| 1807 | | try self.objects.append(gpa, object); |
| 1808 | | try self.resolveSymbolsInObject(object_id); |
| 1809 | | |
| 1810 | | continue :loop; |
| 1811 | | } |
| 1812 | | |
| 1813 | | next_sym += 1; |
| 1814 | | } |
| 1815 | | } |
| 1816 | | |
| 1817 | | fn resolveSymbolsInDylibs(self: *MachO) !void { |
| 1818 | | if (self.dylibs.items.len == 0) return; |
| 1819 | | |
| 1820 | | const gpa = self.base.comp.gpa; |
| 1821 | | var next_sym: usize = 0; |
| 1822 | | loop: while (next_sym < self.unresolved.count()) { |
| 1823 | | const global_index = self.unresolved.keys()[next_sym]; |
| 1824 | | const global = self.globals.items[global_index]; |
| 1825 | | const sym = self.getSymbolPtr(global); |
| 1826 | | const sym_name = self.getSymbolName(global); |
| 1827 | | |
| 1828 | | for (self.dylibs.items, 0..) |dylib, id| { |
| 1829 | | if (!dylib.symbols.contains(sym_name)) continue; |
| 1830 | | |
| 1831 | | const dylib_id = @as(u16, @intCast(id)); |
| 1832 | | if (!self.referenced_dylibs.contains(dylib_id)) { |
| 1833 | | try self.referenced_dylibs.putNoClobber(gpa, dylib_id, {}); |
| 1834 | | } |
| 1835 | | |
| 1836 | | const ordinal = self.referenced_dylibs.getIndex(dylib_id) orelse unreachable; |
| 1837 | | sym.n_type |= macho.N_EXT; |
| 1838 | | sym.n_desc = @as(u16, @intCast(ordinal + 1)) * macho.N_SYMBOL_RESOLVER; |
| 1839 | | |
| 1840 | | if (dylib.weak) { |
| 1841 | | sym.n_desc |= macho.N_WEAK_REF; |
| 1842 | | } |
| 1843 | | |
| 1844 | | _ = self.unresolved.swapRemove(global_index); |
| 1845 | | |
| 1846 | | continue :loop; |
| 1847 | | } |
| 1848 | | |
| 1849 | | next_sym += 1; |
| 1850 | | } |
| 1851 | | } |
| 1852 | | |
| 1853 | | fn resolveSymbolsAtLoading(self: *MachO) !void { |
| 1854 | | const output_mode = self.base.comp.config.output_mode; |
| 1855 | | const is_lib = output_mode == .Lib; |
| 1856 | | const is_dyn_lib = self.base.comp.config.link_mode == .Dynamic and is_lib; |
| 1857 | | const allow_undef = is_dyn_lib and self.base.allow_shlib_undefined; |
| 1858 | | |
| 1859 | | var next_sym: usize = 0; |
| 1860 | | while (next_sym < self.unresolved.count()) { |
| 1861 | | const global_index = self.unresolved.keys()[next_sym]; |
| 1862 | | const global = self.globals.items[global_index]; |
| 1863 | | const sym = self.getSymbolPtr(global); |
| 1864 | | |
| 1865 | | if (sym.discarded()) { |
| 1866 | | sym.* = .{ |
| 1867 | | .n_strx = 0, |
| 1868 | | .n_type = macho.N_UNDF, |
| 1869 | | .n_sect = 0, |
| 1870 | | .n_desc = 0, |
| 1871 | | .n_value = 0, |
| 1872 | | }; |
| 1873 | | _ = self.unresolved.swapRemove(global_index); |
| 1874 | | continue; |
| 1875 | | } else if (allow_undef) { |
| 1876 | | const n_desc = @as( |
| 1877 | | u16, |
| 1878 | | @bitCast(macho.BIND_SPECIAL_DYLIB_FLAT_LOOKUP * @as(i16, @intCast(macho.N_SYMBOL_RESOLVER))), |
| 1879 | | ); |
| 1880 | | sym.n_type = macho.N_EXT; |
| 1881 | | sym.n_desc = n_desc; |
| 1882 | | _ = self.unresolved.swapRemove(global_index); |
| 1883 | | continue; |
| 1884 | | } |
| 1885 | | |
| 1886 | | next_sym += 1; |
| 1887 | | } |
| 1888 | | } |
| 1889 | | |
| 1890 | | fn resolveBoundarySymbols(self: *MachO) !void { |
| 1891 | | const gpa = self.base.comp.gpa; |
| 1892 | | var next_sym: usize = 0; |
| 1893 | | while (next_sym < self.unresolved.count()) { |
| 1894 | | const global_index = self.unresolved.keys()[next_sym]; |
| 1895 | | const global = &self.globals.items[global_index]; |
| 1896 | | |
| 1897 | | if (self.getSectionBoundarySymbol(global.*) != null or self.getSegmentBoundarySymbol(global.*) != null) { |
| 1898 | | const sym_index = try self.allocateSymbol(); |
| 1899 | | const sym_loc = SymbolWithLoc{ .sym_index = sym_index }; |
| 1900 | | const sym = self.getSymbolPtr(sym_loc); |
| 1901 | | sym.* = .{ |
| 1902 | | .n_strx = try self.strtab.insert(gpa, self.getSymbolName(global.*)), |
| 1903 | | .n_type = macho.N_SECT | macho.N_EXT, |
| 1904 | | .n_sect = 0, |
| 1905 | | .n_desc = N_BOUNDARY, |
| 1906 | | .n_value = 0, |
| 1907 | | }; |
| 1908 | | if (global.getFile()) |file| { |
| 1909 | | const global_object = &self.objects.items[file]; |
| 1910 | | global_object.globals_lookup[global.sym_index] = global_index; |
| 1911 | | } |
| 1912 | | global.* = sym_loc; |
| 1913 | | _ = self.unresolved.swapRemove(global_index); |
| 1914 | | continue; |
| 1915 | | } |
| 1916 | | |
| 1917 | | next_sym += 1; |
| 1918 | | } |
| 1919 | | } |
| 1920 | | |
| 1921 | | pub fn deinit(self: *MachO) void { |
| 1922 | | const gpa = self.base.comp.gpa; |
| 1923 | | |
| 1924 | | if (self.llvm_object) |llvm_object| llvm_object.deinit(); |
| 1925 | | |
| 1926 | | if (self.d_sym) |*d_sym| { |
| 1927 | | d_sym.deinit(); |
| 1928 | | } |
| 1929 | | |
| 1930 | | self.got_table.deinit(gpa); |
| 1931 | | self.stub_table.deinit(gpa); |
| 1932 | | self.tlv_ptr_table.deinit(gpa); |
| 1933 | | self.thunk_table.deinit(gpa); |
| 1934 | | |
| 1935 | | for (self.thunks.items) |*thunk| { |
| 1936 | | thunk.deinit(gpa); |
| 1937 | | } |
| 1938 | | self.thunks.deinit(gpa); |
| 1939 | | |
| 1940 | | self.strtab.deinit(gpa); |
| 1941 | | self.locals.deinit(gpa); |
| 1942 | | self.globals.deinit(gpa); |
| 1943 | | self.locals_free_list.deinit(gpa); |
| 1944 | | self.globals_free_list.deinit(gpa); |
| 1945 | | self.unresolved.deinit(gpa); |
| 1946 | | |
| 1947 | | { |
| 1948 | | var it = self.resolver.keyIterator(); |
| 1949 | | while (it.next()) |key_ptr| { |
| 1950 | | gpa.free(key_ptr.*); |
| 1951 | | } |
| 1952 | | self.resolver.deinit(gpa); |
| 1953 | | } |
| 1954 | | |
| 1955 | | for (self.objects.items) |*object| { |
| 1956 | | object.deinit(gpa); |
| 1957 | | } |
| 1958 | | self.objects.deinit(gpa); |
| 1959 | | for (self.archives.items) |*archive| { |
| 1960 | | archive.deinit(gpa); |
| 1961 | | } |
| 1962 | | self.archives.deinit(gpa); |
| 1963 | | for (self.dylibs.items) |*dylib| { |
| 1964 | | dylib.deinit(gpa); |
| 1965 | | } |
| 1966 | | self.dylibs.deinit(gpa); |
| 1967 | | self.dylibs_map.deinit(gpa); |
| 1968 | | self.referenced_dylibs.deinit(gpa); |
| 1969 | | |
| 1970 | | self.segments.deinit(gpa); |
| 1971 | | |
| 1972 | | for (self.sections.items(.free_list)) |*list| { |
| 1973 | | list.deinit(gpa); |
| 1974 | | } |
| 1975 | | self.sections.deinit(gpa); |
| 1976 | | |
| 1977 | | self.atoms.deinit(gpa); |
| 1978 | | |
| 1979 | | for (self.decls.values()) |*m| { |
| 1980 | | m.exports.deinit(gpa); |
| 1981 | | } |
| 1982 | | self.decls.deinit(gpa); |
| 1983 | | |
| 1984 | | self.lazy_syms.deinit(gpa); |
| 1985 | | self.tlv_table.deinit(gpa); |
| 1986 | | |
| 1987 | | for (self.unnamed_const_atoms.values()) |*atoms| { |
| 1988 | | atoms.deinit(gpa); |
| 1989 | | } |
| 1990 | | self.unnamed_const_atoms.deinit(gpa); |
| 1991 | | |
| 1992 | | { |
| 1993 | | var it = self.anon_decls.iterator(); |
| 1994 | | while (it.next()) |entry| { |
| 1995 | | entry.value_ptr.exports.deinit(gpa); |
| 1996 | | } |
| 1997 | | self.anon_decls.deinit(gpa); |
| 1998 | | } |
| 1999 | | |
| 2000 | | self.atom_by_index_table.deinit(gpa); |
| 2001 | | |
| 2002 | | for (self.relocs.values()) |*relocs| { |
| 2003 | | relocs.deinit(gpa); |
| 2004 | | } |
| 2005 | | self.relocs.deinit(gpa); |
| 2006 | | self.actions.deinit(gpa); |
| 2007 | | |
| 2008 | | for (self.rebases.values()) |*rebases| { |
| 2009 | | rebases.deinit(gpa); |
| 2010 | | } |
| 2011 | | self.rebases.deinit(gpa); |
| 2012 | | |
| 2013 | | for (self.bindings.values()) |*bindings| { |
| 2014 | | bindings.deinit(gpa); |
| 2015 | | } |
| 2016 | | self.bindings.deinit(gpa); |
| 2017 | | } |
| 2018 | | |
| 2019 | | fn freeAtom(self: *MachO, atom_index: Atom.Index) void { |
| 2020 | | const gpa = self.base.comp.gpa; |
| 2021 | | log.debug("freeAtom {d}", .{atom_index}); |
| 2022 | | |
| 2023 | | // Remove any relocs and base relocs associated with this Atom |
| 2024 | | Atom.freeRelocations(self, atom_index); |
| 2025 | | |
| 2026 | | const atom = self.getAtom(atom_index); |
| 2027 | | const sect_id = atom.getSymbol(self).n_sect - 1; |
| 2028 | | const free_list = &self.sections.items(.free_list)[sect_id]; |
| 2029 | | var already_have_free_list_node = false; |
| 2030 | | { |
| 2031 | | var i: usize = 0; |
| 2032 | | // TODO turn free_list into a hash map |
| 2033 | | while (i < free_list.items.len) { |
| 2034 | | if (free_list.items[i] == atom_index) { |
| 2035 | | _ = free_list.swapRemove(i); |
| 2036 | | continue; |
| 2037 | | } |
| 2038 | | if (free_list.items[i] == atom.prev_index) { |
| 2039 | | already_have_free_list_node = true; |
| 2040 | | } |
| 2041 | | i += 1; |
| 2042 | | } |
| 2043 | | } |
| 2044 | | |
| 2045 | | const maybe_last_atom_index = &self.sections.items(.last_atom_index)[sect_id]; |
| 2046 | | if (maybe_last_atom_index.*) |last_atom_index| { |
| 2047 | | if (last_atom_index == atom_index) { |
| 2048 | | if (atom.prev_index) |prev_index| { |
| 2049 | | // TODO shrink the section size here |
| 2050 | | maybe_last_atom_index.* = prev_index; |
| 2051 | | } else { |
| 2052 | | maybe_last_atom_index.* = null; |
| 2053 | | } |
| 2054 | | } |
| 2055 | | } |
| 2056 | | |
| 2057 | | if (atom.prev_index) |prev_index| { |
| 2058 | | const prev = self.getAtomPtr(prev_index); |
| 2059 | | prev.next_index = atom.next_index; |
| 2060 | | |
| 2061 | | if (!already_have_free_list_node and prev.*.freeListEligible(self)) { |
| 2062 | | // The free list is heuristics, it doesn't have to be perfect, so we can ignore |
| 2063 | | // the OOM here. |
| 2064 | | free_list.append(gpa, prev_index) catch {}; |
| 2065 | | } |
| 2066 | | } else { |
| 2067 | | self.getAtomPtr(atom_index).prev_index = null; |
| 2068 | | } |
| 2069 | | |
| 2070 | | if (atom.next_index) |next_index| { |
| 2071 | | self.getAtomPtr(next_index).prev_index = atom.prev_index; |
| 2072 | | } else { |
| 2073 | | self.getAtomPtr(atom_index).next_index = null; |
| 2074 | | } |
| 2075 | | |
| 2076 | | // Appending to free lists is allowed to fail because the free lists are heuristics based anyway. |
| 2077 | | const sym_index = atom.getSymbolIndex().?; |
| 2078 | | |
| 2079 | | self.locals_free_list.append(gpa, sym_index) catch {}; |
| 2080 | | |
| 2081 | | // Try freeing GOT atom if this decl had one |
| 2082 | | self.got_table.freeEntry(gpa, .{ .sym_index = sym_index }); |
| 2083 | | |
| 2084 | | if (self.d_sym) |*d_sym| { |
| 2085 | | d_sym.swapRemoveRelocs(sym_index); |
| 2086 | | } |
| 2087 | | |
| 2088 | | self.locals.items[sym_index].n_type = 0; |
| 2089 | | _ = self.atom_by_index_table.remove(sym_index); |
| 2090 | | log.debug(" adding local symbol index {d} to free list", .{sym_index}); |
| 2091 | | self.getAtomPtr(atom_index).sym_index = 0; |
| 2092 | | } |
| 2093 | | |
| 2094 | | fn shrinkAtom(self: *MachO, atom_index: Atom.Index, new_block_size: u64) void { |
| 2095 | | _ = self; |
| 2096 | | _ = atom_index; |
| 2097 | | _ = new_block_size; |
| 2098 | | // TODO check the new capacity, and if it crosses the size threshold into a big enough |
| 2099 | | // capacity, insert a free list node for it. |
| 2100 | | } |
| 2101 | | |
| 2102 | | fn growAtom(self: *MachO, atom_index: Atom.Index, new_atom_size: u64, alignment: Alignment) !u64 { |
| 2103 | | const atom = self.getAtom(atom_index); |
| 2104 | | const sym = atom.getSymbol(self); |
| 2105 | | const align_ok = alignment.check(sym.n_value); |
| 2106 | | const need_realloc = !align_ok or new_atom_size > atom.capacity(self); |
| 2107 | | if (!need_realloc) return sym.n_value; |
| 2108 | | return self.allocateAtom(atom_index, new_atom_size, alignment); |
| 2109 | | } |
| 2110 | | |
| 2111 | | pub fn allocateSymbol(self: *MachO) !u32 { |
| 2112 | | const gpa = self.base.comp.gpa; |
| 2113 | | try self.locals.ensureUnusedCapacity(gpa, 1); |
| 2114 | | |
| 2115 | | const index = blk: { |
| 2116 | | if (self.locals_free_list.popOrNull()) |index| { |
| 2117 | | log.debug(" (reusing symbol index {d})", .{index}); |
| 2118 | | break :blk index; |
| 2119 | | } else { |
| 2120 | | log.debug(" (allocating symbol index {d})", .{self.locals.items.len}); |
| 2121 | | const index = @as(u32, @intCast(self.locals.items.len)); |
| 2122 | | _ = self.locals.addOneAssumeCapacity(); |
| 2123 | | break :blk index; |
| 2124 | | } |
| 2125 | | }; |
| 2126 | | |
| 2127 | | self.locals.items[index] = .{ |
| 2128 | | .n_strx = 0, |
| 2129 | | .n_type = 0, |
| 2130 | | .n_sect = 0, |
| 2131 | | .n_desc = 0, |
| 2132 | | .n_value = 0, |
| 2133 | | }; |
| 2134 | | |
| 2135 | | return index; |
| 2136 | | } |
| 2137 | | |
| 2138 | | fn allocateGlobal(self: *MachO) !u32 { |
| 2139 | | const gpa = self.base.comp.gpa; |
| 2140 | | try self.globals.ensureUnusedCapacity(gpa, 1); |
| 2141 | | |
| 2142 | | const index = blk: { |
| 2143 | | if (self.globals_free_list.popOrNull()) |index| { |
| 2144 | | log.debug(" (reusing global index {d})", .{index}); |
| 2145 | | break :blk index; |
| 2146 | | } else { |
| 2147 | | log.debug(" (allocating symbol index {d})", .{self.globals.items.len}); |
| 2148 | | const index = @as(u32, @intCast(self.globals.items.len)); |
| 2149 | | _ = self.globals.addOneAssumeCapacity(); |
| 2150 | | break :blk index; |
| 2151 | | } |
| 2152 | | }; |
| 2153 | | |
| 2154 | | self.globals.items[index] = .{ .sym_index = 0 }; |
| 2155 | | |
| 2156 | | return index; |
| 2157 | | } |
| 2158 | | |
| 2159 | | pub fn addGotEntry(self: *MachO, reloc_target: SymbolWithLoc) !void { |
| 2160 | | if (self.got_table.lookup.contains(reloc_target)) return; |
| 2161 | | const gpa = self.base.comp.gpa; |
| 2162 | | const got_index = try self.got_table.allocateEntry(gpa, reloc_target); |
| 2163 | | if (self.got_section_index == null) { |
| 2164 | | self.got_section_index = try self.initSection("__DATA_CONST", "__got", .{ |
| 2165 | | .flags = macho.S_NON_LAZY_SYMBOL_POINTERS, |
| 2166 | | }); |
| 2167 | | } |
| 2168 | | if (self.mode == .incremental) { |
| 2169 | | try self.writeOffsetTableEntry(got_index); |
| 2170 | | self.got_table_count_dirty = true; |
| 2171 | | self.markRelocsDirtyByTarget(reloc_target); |
| 2172 | | } |
| 2173 | | } |
| 2174 | | |
| 2175 | | pub fn addStubEntry(self: *MachO, reloc_target: SymbolWithLoc) !void { |
| 2176 | | if (self.stub_table.lookup.contains(reloc_target)) return; |
| 2177 | | const comp = self.base.comp; |
| 2178 | | const gpa = comp.gpa; |
| 2179 | | const cpu_arch = comp.root_mod.resolved_target.result.cpu.arch; |
| 2180 | | const stub_index = try self.stub_table.allocateEntry(gpa, reloc_target); |
| 2181 | | if (self.stubs_section_index == null) { |
| 2182 | | self.stubs_section_index = try self.initSection("__TEXT", "__stubs", .{ |
| 2183 | | .flags = macho.S_SYMBOL_STUBS | |
| 2184 | | macho.S_ATTR_PURE_INSTRUCTIONS | |
| 2185 | | macho.S_ATTR_SOME_INSTRUCTIONS, |
| 2186 | | .reserved2 = stubs.stubSize(cpu_arch), |
| 2187 | | }); |
| 2188 | | self.stub_helper_section_index = try self.initSection("__TEXT", "__stub_helper", .{ |
| 2189 | | .flags = macho.S_REGULAR | |
| 2190 | | macho.S_ATTR_PURE_INSTRUCTIONS | |
| 2191 | | macho.S_ATTR_SOME_INSTRUCTIONS, |
| 2192 | | }); |
| 2193 | | self.la_symbol_ptr_section_index = try self.initSection("__DATA", "__la_symbol_ptr", .{ |
| 2194 | | .flags = macho.S_LAZY_SYMBOL_POINTERS, |
| 2195 | | }); |
| 2196 | | } |
| 2197 | | if (self.mode == .incremental) { |
| 2198 | | try self.writeStubTableEntry(stub_index); |
| 2199 | | self.stub_table_count_dirty = true; |
| 2200 | | self.markRelocsDirtyByTarget(reloc_target); |
| 2201 | | } |
| 2202 | | } |
| 2203 | | |
| 2204 | | pub fn addTlvPtrEntry(self: *MachO, reloc_target: SymbolWithLoc) !void { |
| 2205 | | if (self.tlv_ptr_table.lookup.contains(reloc_target)) return; |
| 2206 | | const gpa = self.base.comp.gpa; |
| 2207 | | _ = try self.tlv_ptr_table.allocateEntry(gpa, reloc_target); |
| 2208 | | if (self.tlv_ptr_section_index == null) { |
| 2209 | | self.tlv_ptr_section_index = try self.initSection("__DATA", "__thread_ptrs", .{ |
| 2210 | | .flags = macho.S_THREAD_LOCAL_VARIABLE_POINTERS, |
| 2211 | | }); |
| 2212 | | } |
| 2213 | | } |
| 2214 | | |
| 2215 | | pub fn updateFunc(self: *MachO, mod: *Module, func_index: InternPool.Index, air: Air, liveness: Liveness) !void { |
| 2216 | | if (build_options.skip_non_native and builtin.object_format != .macho) { |
| 2217 | | @panic("Attempted to compile for object format that was disabled by build configuration"); |
| 2218 | | } |
| 2219 | | if (self.llvm_object) |llvm_object| return llvm_object.updateFunc(mod, func_index, air, liveness); |
| 2220 | | const tracy = trace(@src()); |
| 2221 | | defer tracy.end(); |
| 2222 | | |
| 2223 | | const func = mod.funcInfo(func_index); |
| 2224 | | const decl_index = func.owner_decl; |
| 2225 | | const decl = mod.declPtr(decl_index); |
| 2226 | | |
| 2227 | | const atom_index = try self.getOrCreateAtomForDecl(decl_index); |
| 2228 | | self.freeUnnamedConsts(decl_index); |
| 2229 | | Atom.freeRelocations(self, atom_index); |
| 2230 | | |
| 2231 | | const gpa = self.base.comp.gpa; |
| 2232 | | var code_buffer = std.ArrayList(u8).init(gpa); |
| 2233 | | defer code_buffer.deinit(); |
| 2234 | | |
| 2235 | | var decl_state = if (self.d_sym) |*d_sym| |
| 2236 | | try d_sym.dwarf.initDeclState(mod, decl_index) |
| 2237 | | else |
| 2238 | | null; |
| 2239 | | defer if (decl_state) |*ds| ds.deinit(); |
| 2240 | | |
| 2241 | | const res = if (decl_state) |*ds| |
| 2242 | | try codegen.generateFunction(&self.base, decl.srcLoc(mod), func_index, air, liveness, &code_buffer, .{ |
| 2243 | | .dwarf = ds, |
| 2244 | | }) |
| 2245 | | else |
| 2246 | | try codegen.generateFunction(&self.base, decl.srcLoc(mod), func_index, air, liveness, &code_buffer, .none); |
| 2247 | | |
| 2248 | | const code = switch (res) { |
| 2249 | | .ok => code_buffer.items, |
| 2250 | | .fail => |em| { |
| 2251 | | decl.analysis = .codegen_failure; |
| 2252 | | try mod.failed_decls.put(mod.gpa, decl_index, em); |
| 2253 | | return; |
| 2254 | | }, |
| 2255 | | }; |
| 2256 | | |
| 2257 | | const addr = try self.updateDeclCode(decl_index, code); |
| 2258 | | |
| 2259 | | if (decl_state) |*ds| { |
| 2260 | | try self.d_sym.?.dwarf.commitDeclState( |
| 2261 | | mod, |
| 2262 | | decl_index, |
| 2263 | | addr, |
| 2264 | | self.getAtom(atom_index).size, |
| 2265 | | ds, |
| 2266 | | ); |
| 2267 | | } |
| 2268 | | |
| 2269 | | // Since we updated the vaddr and the size, each corresponding export symbol also |
| 2270 | | // needs to be updated. |
| 2271 | | try self.updateExports(mod, .{ .decl_index = decl_index }, mod.getDeclExports(decl_index)); |
| 2272 | | } |
| 2273 | | |
| 2274 | | pub fn lowerUnnamedConst(self: *MachO, typed_value: TypedValue, decl_index: InternPool.DeclIndex) !u32 { |
| 2275 | | const gpa = self.base.comp.gpa; |
| 2276 | | const mod = self.base.comp.module.?; |
| 2277 | | const gop = try self.unnamed_const_atoms.getOrPut(gpa, decl_index); |
| 2278 | | if (!gop.found_existing) { |
| 2279 | | gop.value_ptr.* = .{}; |
| 2280 | | } |
| 2281 | | const unnamed_consts = gop.value_ptr; |
| 2282 | | const decl = mod.declPtr(decl_index); |
| 2283 | | const decl_name = mod.intern_pool.stringToSlice(try decl.getFullyQualifiedName(mod)); |
| 2284 | | const index = unnamed_consts.items.len; |
| 2285 | | const name = try std.fmt.allocPrint(gpa, "___unnamed_{s}_{d}", .{ decl_name, index }); |
| 2286 | | defer gpa.free(name); |
| 2287 | | const atom_index = switch (try self.lowerConst(name, typed_value, typed_value.ty.abiAlignment(mod), self.data_const_section_index.?, decl.srcLoc(mod))) { |
| 2288 | | .ok => |atom_index| atom_index, |
| 2289 | | .fail => |em| { |
| 2290 | | decl.analysis = .codegen_failure; |
| 2291 | | try mod.failed_decls.put(mod.gpa, decl_index, em); |
| 2292 | | log.debug("{s}", .{em.msg}); |
| 2293 | | return error.CodegenFail; |
| 2294 | | }, |
| 2295 | | }; |
| 2296 | | try unnamed_consts.append(gpa, atom_index); |
| 2297 | | const atom = self.getAtomPtr(atom_index); |
| 2298 | | return atom.getSymbolIndex().?; |
| 2299 | | } |
| 2300 | | |
| 2301 | | const LowerConstResult = union(enum) { |
| 2302 | | ok: Atom.Index, |
| 2303 | | fail: *Module.ErrorMsg, |
| 2304 | | }; |
| 2305 | | |
| 2306 | | fn lowerConst( |
| 2307 | | self: *MachO, |
| 2308 | | name: []const u8, |
| 2309 | | tv: TypedValue, |
| 2310 | | required_alignment: InternPool.Alignment, |
| 2311 | | sect_id: u8, |
| 2312 | | src_loc: Module.SrcLoc, |
| 2313 | | ) !LowerConstResult { |
| 2314 | | const gpa = self.base.comp.gpa; |
| 2315 | | |
| 2316 | | var code_buffer = std.ArrayList(u8).init(gpa); |
| 2317 | | defer code_buffer.deinit(); |
| 2318 | | |
| 2319 | | log.debug("allocating symbol indexes for {s}", .{name}); |
| 2320 | | |
| 2321 | | const sym_index = try self.allocateSymbol(); |
| 2322 | | const atom_index = try self.createAtom(sym_index, .{}); |
| 2323 | | try self.atom_by_index_table.putNoClobber(gpa, sym_index, atom_index); |
| 2324 | | |
| 2325 | | const res = try codegen.generateSymbol(&self.base, src_loc, tv, &code_buffer, .none, .{ |
| 2326 | | .parent_atom_index = self.getAtom(atom_index).getSymbolIndex().?, |
| 2327 | | }); |
| 2328 | | const code = switch (res) { |
| 2329 | | .ok => code_buffer.items, |
| 2330 | | .fail => |em| return .{ .fail = em }, |
| 2331 | | }; |
| 2332 | | |
| 2333 | | const atom = self.getAtomPtr(atom_index); |
| 2334 | | atom.size = code.len; |
| 2335 | | // TODO: work out logic for disambiguating functions from function pointers |
| 2336 | | // const sect_id = self.getDeclOutputSection(decl_index); |
| 2337 | | const symbol = atom.getSymbolPtr(self); |
| 2338 | | const name_str_index = try self.strtab.insert(gpa, name); |
| 2339 | | symbol.n_strx = name_str_index; |
| 2340 | | symbol.n_type = macho.N_SECT; |
| 2341 | | symbol.n_sect = sect_id + 1; |
| 2342 | | symbol.n_value = try self.allocateAtom(atom_index, code.len, required_alignment); |
| 2343 | | errdefer self.freeAtom(atom_index); |
| 2344 | | |
| 2345 | | log.debug("allocated atom for {s} at 0x{x}", .{ name, symbol.n_value }); |
| 2346 | | log.debug(" (required alignment 0x{x})", .{required_alignment}); |
| 2347 | | |
| 2348 | | try self.writeAtom(atom_index, code); |
| 2349 | | self.markRelocsDirtyByTarget(atom.getSymbolWithLoc()); |
| 2350 | | |
| 2351 | | return .{ .ok = atom_index }; |
| 2352 | | } |
| 2353 | | |
| 2354 | | pub fn updateDecl(self: *MachO, mod: *Module, decl_index: InternPool.DeclIndex) !void { |
| 2355 | | if (build_options.skip_non_native and builtin.object_format != .macho) { |
| 2356 | | @panic("Attempted to compile for object format that was disabled by build configuration"); |
| 2357 | | } |
| 2358 | | if (self.llvm_object) |llvm_object| return llvm_object.updateDecl(mod, decl_index); |
| 2359 | | const tracy = trace(@src()); |
| 2360 | | defer tracy.end(); |
| 2361 | | |
| 2362 | | const comp = self.base.comp; |
| 2363 | | const gpa = comp.gpa; |
| 2364 | | const decl = mod.declPtr(decl_index); |
| 2365 | | |
| 2366 | | if (decl.val.getExternFunc(mod)) |_| { |
| 2367 | | return; |
| 2368 | | } |
| 2369 | | |
| 2370 | | if (decl.isExtern(mod)) { |
| 2371 | | // TODO make this part of getGlobalSymbol |
| 2372 | | const name = mod.intern_pool.stringToSlice(decl.name); |
| 2373 | | const sym_name = try std.fmt.allocPrint(gpa, "_{s}", .{name}); |
| 2374 | | defer gpa.free(sym_name); |
| 2375 | | _ = try self.addUndefined(sym_name, .{ .add_got = true }); |
| 2376 | | return; |
| 2377 | | } |
| 2378 | | |
| 2379 | | const is_threadlocal = if (decl.val.getVariable(mod)) |variable| |
| 2380 | | variable.is_threadlocal and comp.config.any_non_single_threaded |
| 2381 | | else |
| 2382 | | false; |
| 2383 | | if (is_threadlocal) return self.updateThreadlocalVariable(mod, decl_index); |
| 2384 | | |
| 2385 | | const atom_index = try self.getOrCreateAtomForDecl(decl_index); |
| 2386 | | const sym_index = self.getAtom(atom_index).getSymbolIndex().?; |
| 2387 | | Atom.freeRelocations(self, atom_index); |
| 2388 | | |
| 2389 | | var code_buffer = std.ArrayList(u8).init(gpa); |
| 2390 | | defer code_buffer.deinit(); |
| 2391 | | |
| 2392 | | var decl_state: ?Dwarf.DeclState = if (self.d_sym) |*d_sym| |
| 2393 | | try d_sym.dwarf.initDeclState(mod, decl_index) |
| 2394 | | else |
| 2395 | | null; |
| 2396 | | defer if (decl_state) |*ds| ds.deinit(); |
| 2397 | | |
| 2398 | | const decl_val = if (decl.val.getVariable(mod)) |variable| Value.fromInterned(variable.init) else decl.val; |
| 2399 | | const res = if (decl_state) |*ds| |
| 2400 | | try codegen.generateSymbol(&self.base, decl.srcLoc(mod), .{ |
| 2401 | | .ty = decl.ty, |
| 2402 | | .val = decl_val, |
| 2403 | | }, &code_buffer, .{ |
| 2404 | | .dwarf = ds, |
| 2405 | | }, .{ |
| 2406 | | .parent_atom_index = sym_index, |
| 2407 | | }) |
| 2408 | | else |
| 2409 | | try codegen.generateSymbol(&self.base, decl.srcLoc(mod), .{ |
| 2410 | | .ty = decl.ty, |
| 2411 | | .val = decl_val, |
| 2412 | | }, &code_buffer, .none, .{ |
| 2413 | | .parent_atom_index = sym_index, |
| 2414 | | }); |
| 2415 | | |
| 2416 | | const code = switch (res) { |
| 2417 | | .ok => code_buffer.items, |
| 2418 | | .fail => |em| { |
| 2419 | | decl.analysis = .codegen_failure; |
| 2420 | | try mod.failed_decls.put(mod.gpa, decl_index, em); |
| 2421 | | return; |
| 2422 | | }, |
| 2423 | | }; |
| 2424 | | const addr = try self.updateDeclCode(decl_index, code); |
| 2425 | | |
| 2426 | | if (decl_state) |*ds| { |
| 2427 | | try self.d_sym.?.dwarf.commitDeclState( |
| 2428 | | mod, |
| 2429 | | decl_index, |
| 2430 | | addr, |
| 2431 | | self.getAtom(atom_index).size, |
| 2432 | | ds, |
| 2433 | | ); |
| 2434 | | } |
| 2435 | | |
| 2436 | | // Since we updated the vaddr and the size, each corresponding export symbol also |
| 2437 | | // needs to be updated. |
| 2438 | | try self.updateExports(mod, .{ .decl_index = decl_index }, mod.getDeclExports(decl_index)); |
| 2439 | | } |
| 2440 | | |
| 2441 | | fn updateLazySymbolAtom( |
| 2442 | | self: *MachO, |
| 2443 | | sym: File.LazySymbol, |
| 2444 | | atom_index: Atom.Index, |
| 2445 | | section_index: u8, |
| 2446 | | ) !void { |
| 2447 | | const gpa = self.base.comp.gpa; |
| 2448 | | const mod = self.base.comp.module.?; |
| 2449 | | |
| 2450 | | var required_alignment: Alignment = .none; |
| 2451 | | var code_buffer = std.ArrayList(u8).init(gpa); |
| 2452 | | defer code_buffer.deinit(); |
| 2453 | | |
| 2454 | | const name_str_index = blk: { |
| 2455 | | const name = try std.fmt.allocPrint(gpa, "___lazy_{s}_{}", .{ |
| 2456 | | @tagName(sym.kind), |
| 2457 | | sym.ty.fmt(mod), |
| 2458 | | }); |
| 2459 | | defer gpa.free(name); |
| 2460 | | break :blk try self.strtab.insert(gpa, name); |
| 2461 | | }; |
| 2462 | | const name = self.strtab.get(name_str_index).?; |
| 2463 | | |
| 2464 | | const atom = self.getAtomPtr(atom_index); |
| 2465 | | const local_sym_index = atom.getSymbolIndex().?; |
| 2466 | | |
| 2467 | | const src = if (sym.ty.getOwnerDeclOrNull(mod)) |owner_decl| |
| 2468 | | mod.declPtr(owner_decl).srcLoc(mod) |
| 2469 | | else |
| 2470 | | Module.SrcLoc{ |
| 2471 | | .file_scope = undefined, |
| 2472 | | .parent_decl_node = undefined, |
| 2473 | | .lazy = .unneeded, |
| 2474 | | }; |
| 2475 | | const res = try codegen.generateLazySymbol( |
| 2476 | | &self.base, |
| 2477 | | src, |
| 2478 | | sym, |
| 2479 | | &required_alignment, |
| 2480 | | &code_buffer, |
| 2481 | | .none, |
| 2482 | | .{ .parent_atom_index = local_sym_index }, |
| 2483 | | ); |
| 2484 | | const code = switch (res) { |
| 2485 | | .ok => code_buffer.items, |
| 2486 | | .fail => |em| { |
| 2487 | | log.debug("{s}", .{em.msg}); |
| 2488 | | return error.CodegenFail; |
| 2489 | | }, |
| 2490 | | }; |
| 2491 | | |
| 2492 | | const symbol = atom.getSymbolPtr(self); |
| 2493 | | symbol.n_strx = name_str_index; |
| 2494 | | symbol.n_type = macho.N_SECT; |
| 2495 | | symbol.n_sect = section_index + 1; |
| 2496 | | symbol.n_desc = 0; |
| 2497 | | |
| 2498 | | const vaddr = try self.allocateAtom(atom_index, code.len, required_alignment); |
| 2499 | | errdefer self.freeAtom(atom_index); |
| 2500 | | |
| 2501 | | log.debug("allocated atom for {s} at 0x{x}", .{ name, vaddr }); |
| 2502 | | log.debug(" (required alignment 0x{x})", .{required_alignment}); |
| 2503 | | |
| 2504 | | atom.size = code.len; |
| 2505 | | symbol.n_value = vaddr; |
| 2506 | | |
| 2507 | | try self.addGotEntry(.{ .sym_index = local_sym_index }); |
| 2508 | | try self.writeAtom(atom_index, code); |
| 2509 | | } |
| 2510 | | |
| 2511 | | pub fn getOrCreateAtomForLazySymbol(self: *MachO, sym: File.LazySymbol) !Atom.Index { |
| 2512 | | const mod = self.base.comp.module.?; |
| 2513 | | const gpa = self.base.comp.gpa; |
| 2514 | | const gop = try self.lazy_syms.getOrPut(gpa, sym.getDecl(mod)); |
| 2515 | | errdefer _ = if (!gop.found_existing) self.lazy_syms.pop(); |
| 2516 | | if (!gop.found_existing) gop.value_ptr.* = .{}; |
| 2517 | | const metadata: struct { atom: *Atom.Index, state: *LazySymbolMetadata.State } = switch (sym.kind) { |
| 2518 | | .code => .{ .atom = &gop.value_ptr.text_atom, .state = &gop.value_ptr.text_state }, |
| 2519 | | .const_data => .{ |
| 2520 | | .atom = &gop.value_ptr.data_const_atom, |
| 2521 | | .state = &gop.value_ptr.data_const_state, |
| 2522 | | }, |
| 2523 | | }; |
| 2524 | | switch (metadata.state.*) { |
| 2525 | | .unused => { |
| 2526 | | const sym_index = try self.allocateSymbol(); |
| 2527 | | metadata.atom.* = try self.createAtom(sym_index, .{}); |
| 2528 | | try self.atom_by_index_table.putNoClobber(gpa, sym_index, metadata.atom.*); |
| 2529 | | }, |
| 2530 | | .pending_flush => return metadata.atom.*, |
| 2531 | | .flushed => {}, |
| 2532 | | } |
| 2533 | | metadata.state.* = .pending_flush; |
| 2534 | | const atom = metadata.atom.*; |
| 2535 | | // anyerror needs to be deferred until flushModule |
| 2536 | | if (sym.getDecl(mod) != .none) try self.updateLazySymbolAtom(sym, atom, switch (sym.kind) { |
| 2537 | | .code => self.text_section_index.?, |
| 2538 | | .const_data => self.data_const_section_index.?, |
| 2539 | | }); |
| 2540 | | return atom; |
| 2541 | | } |
| 2542 | | |
| 2543 | | fn updateThreadlocalVariable(self: *MachO, module: *Module, decl_index: InternPool.DeclIndex) !void { |
| 2544 | | const mod = self.base.comp.module.?; |
| 2545 | | // Lowering a TLV on macOS involves two stages: |
| 2546 | | // 1. first we lower the initializer into appopriate section (__thread_data or __thread_bss) |
| 2547 | | // 2. next, we create a corresponding threadlocal variable descriptor in __thread_vars |
| 2548 | | |
| 2549 | | // 1. Lower the initializer value. |
| 2550 | | const init_atom_index = try self.getOrCreateAtomForDecl(decl_index); |
| 2551 | | const init_atom = self.getAtomPtr(init_atom_index); |
| 2552 | | const init_sym_index = init_atom.getSymbolIndex().?; |
| 2553 | | Atom.freeRelocations(self, init_atom_index); |
| 2554 | | |
| 2555 | | const gpa = self.base.comp.gpa; |
| 2556 | | |
| 2557 | | var code_buffer = std.ArrayList(u8).init(gpa); |
| 2558 | | defer code_buffer.deinit(); |
| 2559 | | |
| 2560 | | var decl_state: ?Dwarf.DeclState = if (self.d_sym) |*d_sym| |
| 2561 | | try d_sym.dwarf.initDeclState(module, decl_index) |
| 2562 | | else |
| 2563 | | null; |
| 2564 | | defer if (decl_state) |*ds| ds.deinit(); |
| 2565 | | |
| 2566 | | const decl = module.declPtr(decl_index); |
| 2567 | | const decl_metadata = self.decls.get(decl_index).?; |
| 2568 | | const decl_val = Value.fromInterned(decl.val.getVariable(mod).?.init); |
| 2569 | | const res = if (decl_state) |*ds| |
| 2570 | | try codegen.generateSymbol(&self.base, decl.srcLoc(mod), .{ |
| 2571 | | .ty = decl.ty, |
| 2572 | | .val = decl_val, |
| 2573 | | }, &code_buffer, .{ |
| 2574 | | .dwarf = ds, |
| 2575 | | }, .{ |
| 2576 | | .parent_atom_index = init_sym_index, |
| 2577 | | }) |
| 2578 | | else |
| 2579 | | try codegen.generateSymbol(&self.base, decl.srcLoc(mod), .{ |
| 2580 | | .ty = decl.ty, |
| 2581 | | .val = decl_val, |
| 2582 | | }, &code_buffer, .none, .{ |
| 2583 | | .parent_atom_index = init_sym_index, |
| 2584 | | }); |
| 2585 | | |
| 2586 | | const code = switch (res) { |
| 2587 | | .ok => code_buffer.items, |
| 2588 | | .fail => |em| { |
| 2589 | | decl.analysis = .codegen_failure; |
| 2590 | | try module.failed_decls.put(module.gpa, decl_index, em); |
| 2591 | | return; |
| 2592 | | }, |
| 2593 | | }; |
| 2594 | | |
| 2595 | | const required_alignment = decl.getAlignment(mod); |
| 2596 | | |
| 2597 | | const decl_name = mod.intern_pool.stringToSlice(try decl.getFullyQualifiedName(module)); |
| 2598 | | |
| 2599 | | const init_sym_name = try std.fmt.allocPrint(gpa, "{s}$tlv$init", .{decl_name}); |
| 2600 | | defer gpa.free(init_sym_name); |
| 2601 | | |
| 2602 | | const sect_id = decl_metadata.section; |
| 2603 | | const init_sym = init_atom.getSymbolPtr(self); |
| 2604 | | init_sym.n_strx = try self.strtab.insert(gpa, init_sym_name); |
| 2605 | | init_sym.n_type = macho.N_SECT; |
| 2606 | | init_sym.n_sect = sect_id + 1; |
| 2607 | | init_sym.n_desc = 0; |
| 2608 | | init_atom.size = code.len; |
| 2609 | | |
| 2610 | | init_sym.n_value = try self.allocateAtom(init_atom_index, code.len, required_alignment); |
| 2611 | | errdefer self.freeAtom(init_atom_index); |
| 2612 | | |
| 2613 | | log.debug("allocated atom for {s} at 0x{x}", .{ init_sym_name, init_sym.n_value }); |
| 2614 | | log.debug(" (required alignment 0x{x})", .{required_alignment}); |
| 2615 | | |
| 2616 | | try self.writeAtom(init_atom_index, code); |
| 2617 | | |
| 2618 | | if (decl_state) |*ds| { |
| 2619 | | try self.d_sym.?.dwarf.commitDeclState( |
| 2620 | | module, |
| 2621 | | decl_index, |
| 2622 | | init_sym.n_value, |
| 2623 | | self.getAtom(init_atom_index).size, |
| 2624 | | ds, |
| 2625 | | ); |
| 2626 | | } |
| 2627 | | |
| 2628 | | try self.updateExports(module, .{ .decl_index = decl_index }, module.getDeclExports(decl_index)); |
| 2629 | | |
| 2630 | | // 2. Create a TLV descriptor. |
| 2631 | | const init_atom_sym_loc = init_atom.getSymbolWithLoc(); |
| 2632 | | const gop = try self.tlv_table.getOrPut(gpa, init_atom_sym_loc); |
| 2633 | | assert(!gop.found_existing); |
| 2634 | | gop.value_ptr.* = try self.createThreadLocalDescriptorAtom(decl_name, init_atom_sym_loc); |
| 2635 | | self.markRelocsDirtyByTarget(init_atom_sym_loc); |
| 2636 | | } |
| 2637 | | |
| 2638 | | pub fn getOrCreateAtomForDecl(self: *MachO, decl_index: InternPool.DeclIndex) !Atom.Index { |
| 2639 | | const gpa = self.base.comp.gpa; |
| 2640 | | const gop = try self.decls.getOrPut(gpa, decl_index); |
| 2641 | | if (!gop.found_existing) { |
| 2642 | | const sym_index = try self.allocateSymbol(); |
| 2643 | | const atom_index = try self.createAtom(sym_index, .{}); |
| 2644 | | try self.atom_by_index_table.putNoClobber(gpa, sym_index, atom_index); |
| 2645 | | gop.value_ptr.* = .{ |
| 2646 | | .atom = atom_index, |
| 2647 | | .section = self.getDeclOutputSection(decl_index), |
| 2648 | | .exports = .{}, |
| 2649 | | }; |
| 2650 | | } |
| 2651 | | return gop.value_ptr.atom; |
| 2652 | | } |
| 2653 | | |
| 2654 | | fn getDeclOutputSection(self: *MachO, decl_index: InternPool.DeclIndex) u8 { |
| 2655 | | const decl = self.base.comp.module.?.declPtr(decl_index); |
| 2656 | | const ty = decl.ty; |
| 2657 | | const val = decl.val; |
| 2658 | | const mod = self.base.comp.module.?; |
| 2659 | | const zig_ty = ty.zigTypeTag(mod); |
| 2660 | | const any_non_single_threaded = self.base.comp.config.any_non_single_threaded; |
| 2661 | | const optimize_mode = self.base.comp.root_mod.optimize_mode; |
| 2662 | | const sect_id: u8 = blk: { |
| 2663 | | // TODO finish and audit this function |
| 2664 | | if (val.isUndefDeep(mod)) { |
| 2665 | | if (optimize_mode == .ReleaseFast or optimize_mode == .ReleaseSmall) { |
| 2666 | | @panic("TODO __DATA,__bss"); |
| 2667 | | } else { |
| 2668 | | break :blk self.data_section_index.?; |
| 2669 | | } |
| 2670 | | } |
| 2671 | | |
| 2672 | | if (val.getVariable(mod)) |variable| { |
| 2673 | | if (variable.is_threadlocal and any_non_single_threaded) { |
| 2674 | | break :blk self.thread_data_section_index.?; |
| 2675 | | } |
| 2676 | | break :blk self.data_section_index.?; |
| 2677 | | } |
| 2678 | | |
| 2679 | | switch (zig_ty) { |
| 2680 | | // TODO: what if this is a function pointer? |
| 2681 | | .Fn => break :blk self.text_section_index.?, |
| 2682 | | else => { |
| 2683 | | if (val.getVariable(mod)) |_| { |
| 2684 | | break :blk self.data_section_index.?; |
| 2685 | | } |
| 2686 | | break :blk self.data_const_section_index.?; |
| 2687 | | }, |
| 2688 | | } |
| 2689 | | }; |
| 2690 | | return sect_id; |
| 2691 | | } |
| 2692 | | |
| 2693 | | fn updateDeclCode(self: *MachO, decl_index: InternPool.DeclIndex, code: []u8) !u64 { |
| 2694 | | const gpa = self.base.comp.gpa; |
| 2695 | | const mod = self.base.comp.module.?; |
| 2696 | | const decl = mod.declPtr(decl_index); |
| 2697 | | |
| 2698 | | const required_alignment = decl.getAlignment(mod); |
| 2699 | | |
| 2700 | | const decl_name = mod.intern_pool.stringToSlice(try decl.getFullyQualifiedName(mod)); |
| 2701 | | |
| 2702 | | const decl_metadata = self.decls.get(decl_index).?; |
| 2703 | | const atom_index = decl_metadata.atom; |
| 2704 | | const atom = self.getAtom(atom_index); |
| 2705 | | const sym_index = atom.getSymbolIndex().?; |
| 2706 | | const sect_id = decl_metadata.section; |
| 2707 | | const header = &self.sections.items(.header)[sect_id]; |
| 2708 | | const segment = self.getSegment(sect_id); |
| 2709 | | const code_len = code.len; |
| 2710 | | |
| 2711 | | if (atom.size != 0) { |
| 2712 | | const sym = atom.getSymbolPtr(self); |
| 2713 | | sym.n_strx = try self.strtab.insert(gpa, decl_name); |
| 2714 | | sym.n_type = macho.N_SECT; |
| 2715 | | sym.n_sect = sect_id + 1; |
| 2716 | | sym.n_desc = 0; |
| 2717 | | |
| 2718 | | const capacity = atom.capacity(self); |
| 2719 | | const need_realloc = code_len > capacity or !required_alignment.check(sym.n_value); |
| 2720 | | |
| 2721 | | if (need_realloc) { |
| 2722 | | const vaddr = try self.growAtom(atom_index, code_len, required_alignment); |
| 2723 | | log.debug("growing {s} and moving from 0x{x} to 0x{x}", .{ decl_name, sym.n_value, vaddr }); |
| 2724 | | log.debug(" (required alignment 0x{x})", .{required_alignment}); |
| 2725 | | |
| 2726 | | if (vaddr != sym.n_value) { |
| 2727 | | sym.n_value = vaddr; |
| 2728 | | log.debug(" (updating GOT entry)", .{}); |
| 2729 | | const got_atom_index = self.got_table.lookup.get(.{ .sym_index = sym_index }).?; |
| 2730 | | try self.writeOffsetTableEntry(got_atom_index); |
| 2731 | | self.markRelocsDirtyByTarget(.{ .sym_index = sym_index }); |
| 2732 | | } |
| 2733 | | } else if (code_len < atom.size) { |
| 2734 | | self.shrinkAtom(atom_index, code_len); |
| 2735 | | } else if (atom.next_index == null) { |
| 2736 | | const needed_size = (sym.n_value + code_len) - segment.vmaddr; |
| 2737 | | header.size = needed_size; |
| 2738 | | } |
| 2739 | | self.getAtomPtr(atom_index).size = code_len; |
| 2740 | | } else { |
| 2741 | | const sym = atom.getSymbolPtr(self); |
| 2742 | | sym.n_strx = try self.strtab.insert(gpa, decl_name); |
| 2743 | | sym.n_type = macho.N_SECT; |
| 2744 | | sym.n_sect = sect_id + 1; |
| 2745 | | sym.n_desc = 0; |
| 2746 | | |
| 2747 | | const vaddr = try self.allocateAtom(atom_index, code_len, required_alignment); |
| 2748 | | errdefer self.freeAtom(atom_index); |
| 2749 | | |
| 2750 | | log.debug("allocated atom for {s} at 0x{x}", .{ decl_name, vaddr }); |
| 2751 | | log.debug(" (required alignment 0x{x})", .{required_alignment}); |
| 2752 | | |
| 2753 | | self.getAtomPtr(atom_index).size = code_len; |
| 2754 | | sym.n_value = vaddr; |
| 2755 | | |
| 2756 | | try self.addGotEntry(.{ .sym_index = sym_index }); |
| 2757 | | } |
| 2758 | | |
| 2759 | | try self.writeAtom(atom_index, code); |
| 2760 | | |
| 2761 | | return atom.getSymbol(self).n_value; |
| 2762 | | } |
| 2763 | | |
| 2764 | | pub fn updateDeclLineNumber(self: *MachO, module: *Module, decl_index: InternPool.DeclIndex) !void { |
| 2765 | | if (self.d_sym) |*d_sym| { |
| 2766 | | try d_sym.dwarf.updateDeclLineNumber(module, decl_index); |
| 2767 | | } |
| 2768 | | } |
| 2769 | | |
| 2770 | | pub fn updateExports( |
| 2771 | | self: *MachO, |
| 2772 | | mod: *Module, |
| 2773 | | exported: Module.Exported, |
| 2774 | | exports: []const *Module.Export, |
| 2775 | | ) File.UpdateExportsError!void { |
| 2776 | | if (build_options.skip_non_native and builtin.object_format != .macho) { |
| 2777 | | @panic("Attempted to compile for object format that was disabled by build configuration"); |
| 2778 | | } |
| 2779 | | if (self.llvm_object) |llvm_object| |
| 2780 | | return llvm_object.updateExports(mod, exported, exports); |
| 2781 | | |
| 2782 | | const tracy = trace(@src()); |
| 2783 | | defer tracy.end(); |
| 2784 | | |
| 2785 | | const gpa = self.base.comp.gpa; |
| 2786 | | |
| 2787 | | const metadata = switch (exported) { |
| 2788 | | .decl_index => |decl_index| blk: { |
| 2789 | | _ = try self.getOrCreateAtomForDecl(decl_index); |
| 2790 | | break :blk self.decls.getPtr(decl_index).?; |
| 2791 | | }, |
| 2792 | | .value => |value| self.anon_decls.getPtr(value) orelse blk: { |
| 2793 | | const first_exp = exports[0]; |
| 2794 | | const res = try self.lowerAnonDecl(value, .none, first_exp.getSrcLoc(mod)); |
| 2795 | | switch (res) { |
| 2796 | | .ok => {}, |
| 2797 | | .fail => |em| { |
| 2798 | | // TODO maybe it's enough to return an error here and let Module.processExportsInner |
| 2799 | | // handle the error? |
| 2800 | | try mod.failed_exports.ensureUnusedCapacity(mod.gpa, 1); |
| 2801 | | mod.failed_exports.putAssumeCapacityNoClobber(first_exp, em); |
| 2802 | | return; |
| 2803 | | }, |
| 2804 | | } |
| 2805 | | break :blk self.anon_decls.getPtr(value).?; |
| 2806 | | }, |
| 2807 | | }; |
| 2808 | | const atom_index = metadata.atom; |
| 2809 | | const atom = self.getAtom(atom_index); |
| 2810 | | const sym = atom.getSymbol(self); |
| 2811 | | |
| 2812 | | for (exports) |exp| { |
| 2813 | | const exp_name = try std.fmt.allocPrint(gpa, "_{}", .{ |
| 2814 | | exp.opts.name.fmt(&mod.intern_pool), |
| 2815 | | }); |
| 2816 | | defer gpa.free(exp_name); |
| 2817 | | |
| 2818 | | log.debug("adding new export '{s}'", .{exp_name}); |
| 2819 | | |
| 2820 | | if (exp.opts.section.unwrap()) |section_name| { |
| 2821 | | if (!mod.intern_pool.stringEqlSlice(section_name, "__text")) { |
| 2822 | | try mod.failed_exports.putNoClobber(mod.gpa, exp, try Module.ErrorMsg.create( |
| 2823 | | gpa, |
| 2824 | | exp.getSrcLoc(mod), |
| 2825 | | "Unimplemented: ExportOptions.section", |
| 2826 | | .{}, |
| 2827 | | )); |
| 2828 | | continue; |
| 2829 | | } |
| 2830 | | } |
| 2831 | | |
| 2832 | | if (exp.opts.linkage == .LinkOnce) { |
| 2833 | | try mod.failed_exports.putNoClobber(mod.gpa, exp, try Module.ErrorMsg.create( |
| 2834 | | gpa, |
| 2835 | | exp.getSrcLoc(mod), |
| 2836 | | "Unimplemented: GlobalLinkage.LinkOnce", |
| 2837 | | .{}, |
| 2838 | | )); |
| 2839 | | continue; |
| 2840 | | } |
| 2841 | | |
| 2842 | | const global_sym_index = metadata.getExport(self, exp_name) orelse blk: { |
| 2843 | | const global_sym_index = if (self.getGlobalIndex(exp_name)) |global_index| ind: { |
| 2844 | | const global = self.globals.items[global_index]; |
| 2845 | | // TODO this is just plain wrong as it all should happen in a single `resolveSymbols` |
| 2846 | | // pass. This will go away once we abstact away Zig's incremental compilation into |
| 2847 | | // its own module. |
| 2848 | | if (global.getFile() == null and self.getSymbol(global).undf()) { |
| 2849 | | _ = self.unresolved.swapRemove(global_index); |
| 2850 | | break :ind global.sym_index; |
| 2851 | | } |
| 2852 | | break :ind try self.allocateSymbol(); |
| 2853 | | } else try self.allocateSymbol(); |
| 2854 | | try metadata.exports.append(gpa, global_sym_index); |
| 2855 | | break :blk global_sym_index; |
| 2856 | | }; |
| 2857 | | const global_sym_loc = SymbolWithLoc{ .sym_index = global_sym_index }; |
| 2858 | | const global_sym = self.getSymbolPtr(global_sym_loc); |
| 2859 | | global_sym.* = .{ |
| 2860 | | .n_strx = try self.strtab.insert(gpa, exp_name), |
| 2861 | | .n_type = macho.N_SECT | macho.N_EXT, |
| 2862 | | .n_sect = metadata.section + 1, |
| 2863 | | .n_desc = 0, |
| 2864 | | .n_value = sym.n_value, |
| 2865 | | }; |
| 2866 | | |
| 2867 | | switch (exp.opts.linkage) { |
| 2868 | | .Internal => { |
| 2869 | | // Symbol should be hidden, or in MachO lingo, private extern. |
| 2870 | | // We should also mark the symbol as Weak: n_desc == N_WEAK_DEF. |
| 2871 | | global_sym.n_type |= macho.N_PEXT; |
| 2872 | | global_sym.n_desc |= macho.N_WEAK_DEF; |
| 2873 | | }, |
| 2874 | | .Strong => {}, |
| 2875 | | .Weak => { |
| 2876 | | // Weak linkage is specified as part of n_desc field. |
| 2877 | | // Symbol's n_type is like for a symbol with strong linkage. |
| 2878 | | global_sym.n_desc |= macho.N_WEAK_DEF; |
| 2879 | | }, |
| 2880 | | else => unreachable, |
| 2881 | | } |
| 2882 | | |
| 2883 | | self.resolveGlobalSymbol(global_sym_loc) catch |err| switch (err) { |
| 2884 | | error.MultipleSymbolDefinitions => { |
| 2885 | | // TODO: this needs rethinking |
| 2886 | | const global = self.getGlobal(exp_name).?; |
| 2887 | | if (global_sym_loc.sym_index != global.sym_index and global.getFile() != null) { |
| 2888 | | _ = try mod.failed_exports.put(mod.gpa, exp, try Module.ErrorMsg.create( |
| 2889 | | gpa, |
| 2890 | | exp.getSrcLoc(mod), |
| 2891 | | \\LinkError: symbol '{s}' defined multiple times |
| 2892 | | , |
| 2893 | | .{exp_name}, |
| 2894 | | )); |
| 2895 | | } |
| 2896 | | }, |
| 2897 | | else => |e| return e, |
| 2898 | | }; |
| 2899 | | } |
| 2900 | | } |
| 2901 | | |
| 2902 | | pub fn deleteDeclExport( |
| 2903 | | self: *MachO, |
| 2904 | | decl_index: InternPool.DeclIndex, |
| 2905 | | name: InternPool.NullTerminatedString, |
| 2906 | | ) Allocator.Error!void { |
| 2907 | | if (self.llvm_object) |_| return; |
| 2908 | | const metadata = self.decls.getPtr(decl_index) orelse return; |
| 2909 | | |
| 2910 | | const gpa = self.base.comp.gpa; |
| 2911 | | const mod = self.base.comp.module.?; |
| 2912 | | const exp_name = try std.fmt.allocPrint(gpa, "_{s}", .{mod.intern_pool.stringToSlice(name)}); |
| 2913 | | defer gpa.free(exp_name); |
| 2914 | | const sym_index = metadata.getExportPtr(self, exp_name) orelse return; |
| 2915 | | |
| 2916 | | const sym_loc = SymbolWithLoc{ .sym_index = sym_index.* }; |
| 2917 | | const sym = self.getSymbolPtr(sym_loc); |
| 2918 | | log.debug("deleting export '{s}'", .{exp_name}); |
| 2919 | | assert(sym.sect() and sym.ext()); |
| 2920 | | sym.* = .{ |
| 2921 | | .n_strx = 0, |
| 2922 | | .n_type = 0, |
| 2923 | | .n_sect = 0, |
| 2924 | | .n_desc = 0, |
| 2925 | | .n_value = 0, |
| 2926 | | }; |
| 2927 | | self.locals_free_list.append(gpa, sym_index.*) catch {}; |
| 2928 | | |
| 2929 | | if (self.resolver.fetchRemove(exp_name)) |entry| { |
| 2930 | | defer gpa.free(entry.key); |
| 2931 | | self.globals_free_list.append(gpa, entry.value) catch {}; |
| 2932 | | self.globals.items[entry.value] = .{ .sym_index = 0 }; |
| 2933 | | } |
| 2934 | | |
| 2935 | | sym_index.* = 0; |
| 2936 | | } |
| 2937 | | |
| 2938 | | fn freeUnnamedConsts(self: *MachO, decl_index: InternPool.DeclIndex) void { |
| 2939 | | const gpa = self.base.comp.gpa; |
| 2940 | | const unnamed_consts = self.unnamed_const_atoms.getPtr(decl_index) orelse return; |
| 2941 | | for (unnamed_consts.items) |atom| { |
| 2942 | | self.freeAtom(atom); |
| 2943 | | } |
| 2944 | | unnamed_consts.clearAndFree(gpa); |
| 2945 | | } |
| 2946 | | |
| 2947 | | pub fn freeDecl(self: *MachO, decl_index: InternPool.DeclIndex) void { |
| 2948 | | if (self.llvm_object) |llvm_object| return llvm_object.freeDecl(decl_index); |
| 2949 | | const gpa = self.base.comp.gpa; |
| 2950 | | const mod = self.base.comp.module.?; |
| 2951 | | const decl = mod.declPtr(decl_index); |
| 2952 | | |
| 2953 | | log.debug("freeDecl {*}", .{decl}); |
| 2954 | | |
| 2955 | | if (self.decls.fetchSwapRemove(decl_index)) |const_kv| { |
| 2956 | | var kv = const_kv; |
| 2957 | | self.freeAtom(kv.value.atom); |
| 2958 | | self.freeUnnamedConsts(decl_index); |
| 2959 | | kv.value.exports.deinit(gpa); |
| 2960 | | } |
| 2961 | | |
| 2962 | | if (self.d_sym) |*d_sym| { |
| 2963 | | d_sym.dwarf.freeDecl(decl_index); |
| 2964 | | } |
| 2965 | | } |
| 2966 | | |
| 2967 | | pub fn getDeclVAddr(self: *MachO, decl_index: InternPool.DeclIndex, reloc_info: File.RelocInfo) !u64 { |
| 2968 | | assert(self.llvm_object == null); |
| 2969 | | |
| 2970 | | const this_atom_index = try self.getOrCreateAtomForDecl(decl_index); |
| 2971 | | const sym_index = self.getAtom(this_atom_index).getSymbolIndex().?; |
| 2972 | | const atom_index = self.getAtomIndexForSymbol(.{ .sym_index = reloc_info.parent_atom_index }).?; |
| 2973 | | try Atom.addRelocation(self, atom_index, .{ |
| 2974 | | .type = .unsigned, |
| 2975 | | .target = .{ .sym_index = sym_index }, |
| 2976 | | .offset = @as(u32, @intCast(reloc_info.offset)), |
| 2977 | | .addend = reloc_info.addend, |
| 2978 | | .pcrel = false, |
| 2979 | | .length = 3, |
| 2980 | | }); |
| 2981 | | try Atom.addRebase(self, atom_index, @as(u32, @intCast(reloc_info.offset))); |
| 2982 | | |
| 2983 | | return 0; |
| 2984 | | } |
| 2985 | | |
| 2986 | | pub fn lowerAnonDecl( |
| 2987 | | self: *MachO, |
| 2988 | | decl_val: InternPool.Index, |
| 2989 | | explicit_alignment: InternPool.Alignment, |
| 2990 | | src_loc: Module.SrcLoc, |
| 2991 | | ) !codegen.Result { |
| 2992 | | const gpa = self.base.comp.gpa; |
| 2993 | | const mod = self.base.comp.module.?; |
| 2994 | | const ty = Type.fromInterned(mod.intern_pool.typeOf(decl_val)); |
| 2995 | | const decl_alignment = switch (explicit_alignment) { |
| 2996 | | .none => ty.abiAlignment(mod), |
| 2997 | | else => explicit_alignment, |
| 2998 | | }; |
| 2999 | | if (self.anon_decls.get(decl_val)) |metadata| { |
| 3000 | | const existing_addr = self.getAtom(metadata.atom).getSymbol(self).n_value; |
| 3001 | | if (decl_alignment.check(existing_addr)) |
| 3002 | | return .ok; |
| 3003 | | } |
| 3004 | | |
| 3005 | | const val = Value.fromInterned(decl_val); |
| 3006 | | const tv = TypedValue{ .ty = ty, .val = val }; |
| 3007 | | var name_buf: [32]u8 = undefined; |
| 3008 | | const name = std.fmt.bufPrint(&name_buf, "__anon_{d}", .{ |
| 3009 | | @intFromEnum(decl_val), |
| 3010 | | }) catch unreachable; |
| 3011 | | const res = self.lowerConst( |
| 3012 | | name, |
| 3013 | | tv, |
| 3014 | | decl_alignment, |
| 3015 | | self.data_const_section_index.?, |
| 3016 | | src_loc, |
| 3017 | | ) catch |err| switch (err) { |
| 3018 | | error.OutOfMemory => return error.OutOfMemory, |
| 3019 | | else => |e| return .{ .fail = try Module.ErrorMsg.create( |
| 3020 | | gpa, |
| 3021 | | src_loc, |
| 3022 | | "unable to lower constant value: {s}", |
| 3023 | | .{@errorName(e)}, |
| 3024 | | ) }, |
| 3025 | | }; |
| 3026 | | const atom_index = switch (res) { |
| 3027 | | .ok => |atom_index| atom_index, |
| 3028 | | .fail => |em| return .{ .fail = em }, |
| 3029 | | }; |
| 3030 | | try self.anon_decls.put(gpa, decl_val, .{ |
| 3031 | | .atom = atom_index, |
| 3032 | | .section = self.data_const_section_index.?, |
| 3033 | | }); |
| 3034 | | return .ok; |
| 3035 | | } |
| 3036 | | |
| 3037 | | pub fn getAnonDeclVAddr(self: *MachO, decl_val: InternPool.Index, reloc_info: link.File.RelocInfo) !u64 { |
| 3038 | | assert(self.llvm_object == null); |
| 3039 | | |
| 3040 | | const this_atom_index = self.anon_decls.get(decl_val).?.atom; |
| 3041 | | const sym_index = self.getAtom(this_atom_index).getSymbolIndex().?; |
| 3042 | | const atom_index = self.getAtomIndexForSymbol(.{ .sym_index = reloc_info.parent_atom_index }).?; |
| 3043 | | try Atom.addRelocation(self, atom_index, .{ |
| 3044 | | .type = .unsigned, |
| 3045 | | .target = .{ .sym_index = sym_index }, |
| 3046 | | .offset = @as(u32, @intCast(reloc_info.offset)), |
| 3047 | | .addend = reloc_info.addend, |
| 3048 | | .pcrel = false, |
| 3049 | | .length = 3, |
| 3050 | | }); |
| 3051 | | try Atom.addRebase(self, atom_index, @as(u32, @intCast(reloc_info.offset))); |
| 3052 | | |
| 3053 | | return 0; |
| 3054 | | } |
| 3055 | | |
| 3056 | | const PopulateMissingMetadataOptions = struct { |
| 3057 | | symbol_count_hint: u64, |
| 3058 | | program_code_size_hint: u64, |
| 3059 | | }; |
| 3060 | | |
| 3061 | | fn populateMissingMetadata(self: *MachO, options: PopulateMissingMetadataOptions) !void { |
| 3062 | | assert(self.mode == .incremental); |
| 3063 | | |
| 3064 | | const comp = self.base.comp; |
| 3065 | | const gpa = comp.gpa; |
| 3066 | | const target = comp.root_mod.resolved_target.result; |
| 3067 | | const cpu_arch = target.cpu.arch; |
| 3068 | | const pagezero_vmsize = self.calcPagezeroSize(); |
| 3069 | | |
| 3070 | | if (self.pagezero_segment_cmd_index == null) { |
| 3071 | | if (pagezero_vmsize > 0) { |
| 3072 | | self.pagezero_segment_cmd_index = @as(u8, @intCast(self.segments.items.len)); |
| 3073 | | try self.segments.append(gpa, .{ |
| 3074 | | .segname = makeStaticString("__PAGEZERO"), |
| 3075 | | .vmsize = pagezero_vmsize, |
| 3076 | | .cmdsize = @sizeOf(macho.segment_command_64), |
| 3077 | | }); |
| 3078 | | } |
| 3079 | | } |
| 3080 | | |
| 3081 | | if (self.header_segment_cmd_index == null) { |
| 3082 | | // The first __TEXT segment is immovable and covers MachO header and load commands. |
| 3083 | | self.header_segment_cmd_index = @as(u8, @intCast(self.segments.items.len)); |
| 3084 | | const ideal_size = self.headerpad_size; |
| 3085 | | const needed_size = mem.alignForward(u64, padToIdeal(ideal_size), getPageSize(cpu_arch)); |
| 3086 | | |
| 3087 | | log.debug("found __TEXT segment (header-only) free space 0x{x} to 0x{x}", .{ 0, needed_size }); |
| 3088 | | |
| 3089 | | try self.segments.append(gpa, .{ |
| 3090 | | .segname = makeStaticString("__TEXT"), |
| 3091 | | .vmaddr = pagezero_vmsize, |
| 3092 | | .vmsize = needed_size, |
| 3093 | | .filesize = needed_size, |
| 3094 | | .maxprot = macho.PROT.READ | macho.PROT.EXEC, |
| 3095 | | .initprot = macho.PROT.READ | macho.PROT.EXEC, |
| 3096 | | .cmdsize = @sizeOf(macho.segment_command_64), |
| 3097 | | }); |
| 3098 | | self.segment_table_dirty = true; |
| 3099 | | } |
| 3100 | | |
| 3101 | | if (self.text_section_index == null) { |
| 3102 | | // Sadly, segments need unique string identfiers for some reason. |
| 3103 | | self.text_section_index = try self.allocateSection("__TEXT1", "__text", .{ |
| 3104 | | .size = options.program_code_size_hint, |
| 3105 | | .alignment = switch (cpu_arch) { |
| 3106 | | .x86_64 => 1, |
| 3107 | | .aarch64 => @sizeOf(u32), |
| 3108 | | else => unreachable, // unhandled architecture type |
| 3109 | | }, |
| 3110 | | .flags = macho.S_REGULAR | macho.S_ATTR_PURE_INSTRUCTIONS | macho.S_ATTR_SOME_INSTRUCTIONS, |
| 3111 | | .prot = macho.PROT.READ | macho.PROT.EXEC, |
| 3112 | | }); |
| 3113 | | self.segment_table_dirty = true; |
| 3114 | | } |
| 3115 | | |
| 3116 | | if (self.stubs_section_index == null) { |
| 3117 | | const stub_size = stubs.stubSize(cpu_arch); |
| 3118 | | self.stubs_section_index = try self.allocateSection("__TEXT2", "__stubs", .{ |
| 3119 | | .size = stub_size, |
| 3120 | | .alignment = stubs.stubAlignment(cpu_arch), |
| 3121 | | .flags = macho.S_SYMBOL_STUBS | macho.S_ATTR_PURE_INSTRUCTIONS | macho.S_ATTR_SOME_INSTRUCTIONS, |
| 3122 | | .reserved2 = stub_size, |
| 3123 | | .prot = macho.PROT.READ | macho.PROT.EXEC, |
| 3124 | | }); |
| 3125 | | self.segment_table_dirty = true; |
| 3126 | | } |
| 3127 | | |
| 3128 | | if (self.stub_helper_section_index == null) { |
| 3129 | | self.stub_helper_section_index = try self.allocateSection("__TEXT3", "__stub_helper", .{ |
| 3130 | | .size = @sizeOf(u32), |
| 3131 | | .alignment = stubs.stubAlignment(cpu_arch), |
| 3132 | | .flags = macho.S_REGULAR | macho.S_ATTR_PURE_INSTRUCTIONS | macho.S_ATTR_SOME_INSTRUCTIONS, |
| 3133 | | .prot = macho.PROT.READ | macho.PROT.EXEC, |
| 3134 | | }); |
| 3135 | | self.segment_table_dirty = true; |
| 3136 | | } |
| 3137 | | |
| 3138 | | if (self.got_section_index == null) { |
| 3139 | | self.got_section_index = try self.allocateSection("__DATA_CONST", "__got", .{ |
| 3140 | | .size = @sizeOf(u64) * options.symbol_count_hint, |
| 3141 | | .alignment = @alignOf(u64), |
| 3142 | | .flags = macho.S_NON_LAZY_SYMBOL_POINTERS, |
| 3143 | | .prot = macho.PROT.READ | macho.PROT.WRITE, |
| 3144 | | }); |
| 3145 | | self.segment_table_dirty = true; |
| 3146 | | } |
| 3147 | | |
| 3148 | | if (self.data_const_section_index == null) { |
| 3149 | | self.data_const_section_index = try self.allocateSection("__DATA_CONST1", "__const", .{ |
| 3150 | | .size = @sizeOf(u64), |
| 3151 | | .alignment = @alignOf(u64), |
| 3152 | | .flags = macho.S_REGULAR, |
| 3153 | | .prot = macho.PROT.READ | macho.PROT.WRITE, |
| 3154 | | }); |
| 3155 | | self.segment_table_dirty = true; |
| 3156 | | } |
| 3157 | | |
| 3158 | | if (self.la_symbol_ptr_section_index == null) { |
| 3159 | | self.la_symbol_ptr_section_index = try self.allocateSection("__DATA", "__la_symbol_ptr", .{ |
| 3160 | | .size = @sizeOf(u64), |
| 3161 | | .alignment = @alignOf(u64), |
| 3162 | | .flags = macho.S_LAZY_SYMBOL_POINTERS, |
| 3163 | | .prot = macho.PROT.READ | macho.PROT.WRITE, |
| 3164 | | }); |
| 3165 | | self.segment_table_dirty = true; |
| 3166 | | } |
| 3167 | | |
| 3168 | | if (self.data_section_index == null) { |
| 3169 | | self.data_section_index = try self.allocateSection("__DATA1", "__data", .{ |
| 3170 | | .size = @sizeOf(u64), |
| 3171 | | .alignment = @alignOf(u64), |
| 3172 | | .flags = macho.S_REGULAR, |
| 3173 | | .prot = macho.PROT.READ | macho.PROT.WRITE, |
| 3174 | | }); |
| 3175 | | self.segment_table_dirty = true; |
| 3176 | | } |
| 3177 | | |
| 3178 | | if (comp.config.any_non_single_threaded) { |
| 3179 | | if (self.thread_vars_section_index == null) { |
| 3180 | | self.thread_vars_section_index = try self.allocateSection("__DATA2", "__thread_vars", .{ |
| 3181 | | .size = @sizeOf(u64) * 3, |
| 3182 | | .alignment = @sizeOf(u64), |
| 3183 | | .flags = macho.S_THREAD_LOCAL_VARIABLES, |
| 3184 | | .prot = macho.PROT.READ | macho.PROT.WRITE, |
| 3185 | | }); |
| 3186 | | self.segment_table_dirty = true; |
| 3187 | | } |
| 3188 | | |
| 3189 | | if (self.thread_data_section_index == null) { |
| 3190 | | self.thread_data_section_index = try self.allocateSection("__DATA3", "__thread_data", .{ |
| 3191 | | .size = @sizeOf(u64), |
| 3192 | | .alignment = @alignOf(u64), |
| 3193 | | .flags = macho.S_THREAD_LOCAL_REGULAR, |
| 3194 | | .prot = macho.PROT.READ | macho.PROT.WRITE, |
| 3195 | | }); |
| 3196 | | self.segment_table_dirty = true; |
| 3197 | | } |
| 3198 | | } |
| 3199 | | |
| 3200 | | if (self.linkedit_segment_cmd_index == null) { |
| 3201 | | self.linkedit_segment_cmd_index = @as(u8, @intCast(self.segments.items.len)); |
| 3202 | | |
| 3203 | | try self.segments.append(gpa, .{ |
| 3204 | | .segname = makeStaticString("__LINKEDIT"), |
| 3205 | | .maxprot = macho.PROT.READ, |
| 3206 | | .initprot = macho.PROT.READ, |
| 3207 | | .cmdsize = @sizeOf(macho.segment_command_64), |
| 3208 | | }); |
| 3209 | | } |
| 3210 | | } |
| 3211 | | |
| 3212 | | fn calcPagezeroSize(self: *MachO) u64 { |
| 3213 | | const output_mode = self.base.comp.config.output_mode; |
| 3214 | | const target = self.base.comp.root_mod.resolved_target.result; |
| 3215 | | const page_size = getPageSize(target.cpu.arch); |
| 3216 | | const aligned_pagezero_vmsize = mem.alignBackward(u64, self.pagezero_vmsize, page_size); |
| 3217 | | if (output_mode == .Lib) return 0; |
| 3218 | | if (aligned_pagezero_vmsize == 0) return 0; |
| 3219 | | if (aligned_pagezero_vmsize != self.pagezero_vmsize) { |
| 3220 | | log.warn("requested __PAGEZERO size (0x{x}) is not page aligned", .{self.pagezero_vmsize}); |
| 3221 | | log.warn(" rounding down to 0x{x}", .{aligned_pagezero_vmsize}); |
| 3222 | | } |
| 3223 | | return aligned_pagezero_vmsize; |
| 3224 | | } |
| 3225 | | |
| 3226 | | const InitSectionOpts = struct { |
| 3227 | | flags: u32 = macho.S_REGULAR, |
| 3228 | | reserved1: u32 = 0, |
| 3229 | | reserved2: u32 = 0, |
| 3230 | | }; |
| 3231 | | |
| 3232 | | pub fn initSection(self: *MachO, segname: []const u8, sectname: []const u8, opts: InitSectionOpts) !u8 { |
| 3233 | | log.debug("creating section '{s},{s}'", .{ segname, sectname }); |
| 3234 | | const index = @as(u8, @intCast(self.sections.slice().len)); |
| 3235 | | const gpa = self.base.comp.gpa; |
| 3236 | | try self.sections.append(gpa, .{ |
| 3237 | | .segment_index = undefined, // Segments will be created automatically later down the pipeline |
| 3238 | | .header = .{ |
| 3239 | | .sectname = makeStaticString(sectname), |
| 3240 | | .segname = makeStaticString(segname), |
| 3241 | | .flags = opts.flags, |
| 3242 | | .reserved1 = opts.reserved1, |
| 3243 | | .reserved2 = opts.reserved2, |
| 3244 | | }, |
| 3245 | | }); |
| 3246 | | return index; |
| 3247 | | } |
| 3248 | | |
| 3249 | | fn allocateSection(self: *MachO, segname: []const u8, sectname: []const u8, opts: struct { |
| 3250 | | size: u64 = 0, |
| 3251 | | alignment: u32 = 0, |
| 3252 | | prot: macho.vm_prot_t = macho.PROT.NONE, |
| 3253 | | flags: u32 = macho.S_REGULAR, |
| 3254 | | reserved2: u32 = 0, |
| 3255 | | }) !u8 { |
| 3256 | | const gpa = self.base.comp.gpa; |
| 3257 | | const target = self.base.comp.root_mod.resolved_target.result; |
| 3258 | | const page_size = getPageSize(target.cpu.arch); |
| 3259 | | // In incremental context, we create one section per segment pairing. This way, |
| 3260 | | // we can move the segment in raw file as we please. |
| 3261 | | const segment_id = @as(u8, @intCast(self.segments.items.len)); |
| 3262 | | const vmaddr = blk: { |
| 3263 | | const prev_segment = self.segments.items[segment_id - 1]; |
| 3264 | | break :blk mem.alignForward(u64, prev_segment.vmaddr + prev_segment.vmsize, page_size); |
| 3265 | | }; |
| 3266 | | // We commit more memory than needed upfront so that we don't have to reallocate too soon. |
| 3267 | | const vmsize = mem.alignForward(u64, opts.size, page_size); |
| 3268 | | const off = self.findFreeSpace(opts.size, page_size); |
| 3269 | | |
| 3270 | | log.debug("found {s},{s} free space 0x{x} to 0x{x} (0x{x} - 0x{x})", .{ |
| 3271 | | segname, |
| 3272 | | sectname, |
| 3273 | | off, |
| 3274 | | off + opts.size, |
| 3275 | | vmaddr, |
| 3276 | | vmaddr + vmsize, |
| 3277 | | }); |
| 3278 | | |
| 3279 | | const seg = try self.segments.addOne(gpa); |
| 3280 | | seg.* = .{ |
| 3281 | | .segname = makeStaticString(segname), |
| 3282 | | .vmaddr = vmaddr, |
| 3283 | | .vmsize = vmsize, |
| 3284 | | .fileoff = off, |
| 3285 | | .filesize = vmsize, |
| 3286 | | .maxprot = opts.prot, |
| 3287 | | .initprot = opts.prot, |
| 3288 | | .nsects = 1, |
| 3289 | | .cmdsize = @sizeOf(macho.segment_command_64) + @sizeOf(macho.section_64), |
| 3290 | | }; |
| 3291 | | |
| 3292 | | const sect_id = try self.initSection(segname, sectname, .{ |
| 3293 | | .flags = opts.flags, |
| 3294 | | .reserved2 = opts.reserved2, |
| 3295 | | }); |
| 3296 | | const section = &self.sections.items(.header)[sect_id]; |
| 3297 | | section.addr = mem.alignForward(u64, vmaddr, opts.alignment); |
| 3298 | | section.offset = mem.alignForward(u32, @as(u32, @intCast(off)), opts.alignment); |
| 3299 | | section.size = opts.size; |
| 3300 | | section.@"align" = math.log2(opts.alignment); |
| 3301 | | self.sections.items(.segment_index)[sect_id] = segment_id; |
| 3302 | | assert(!section.isZerofill()); // TODO zerofill sections |
| 3303 | | |
| 3304 | | return sect_id; |
| 3305 | | } |
| 3306 | | |
| 3307 | | fn growSection(self: *MachO, sect_id: u8, needed_size: u64) !void { |
| 3308 | | const header = &self.sections.items(.header)[sect_id]; |
| 3309 | | const segment_index = self.sections.items(.segment_index)[sect_id]; |
| 3310 | | const segment = &self.segments.items[segment_index]; |
| 3311 | | const maybe_last_atom_index = self.sections.items(.last_atom_index)[sect_id]; |
| 3312 | | const sect_capacity = self.allocatedSize(header.offset); |
| 3313 | | const target = self.base.comp.root_mod.resolved_target.result; |
| 3314 | | const page_size = getPageSize(target.cpu.arch); |
| 3315 | | |
| 3316 | | if (needed_size > sect_capacity) { |
| 3317 | | const new_offset = self.findFreeSpace(needed_size, page_size); |
| 3318 | | const current_size = if (maybe_last_atom_index) |last_atom_index| blk: { |
| 3319 | | const last_atom = self.getAtom(last_atom_index); |
| 3320 | | const sym = last_atom.getSymbol(self); |
| 3321 | | break :blk (sym.n_value + last_atom.size) - segment.vmaddr; |
| 3322 | | } else header.size; |
| 3323 | | |
| 3324 | | log.debug("moving {s},{s} from 0x{x} to 0x{x}", .{ |
| 3325 | | header.segName(), |
| 3326 | | header.sectName(), |
| 3327 | | header.offset, |
| 3328 | | new_offset, |
| 3329 | | }); |
| 3330 | | |
| 3331 | | const amt = try self.base.file.?.copyRangeAll( |
| 3332 | | header.offset, |
| 3333 | | self.base.file.?, |
| 3334 | | new_offset, |
| 3335 | | current_size, |
| 3336 | | ); |
| 3337 | | if (amt != current_size) return error.InputOutput; |
| 3338 | | header.offset = @as(u32, @intCast(new_offset)); |
| 3339 | | segment.fileoff = new_offset; |
| 3340 | | } |
| 3341 | | |
| 3342 | | const sect_vm_capacity = self.allocatedVirtualSize(segment.vmaddr); |
| 3343 | | if (needed_size > sect_vm_capacity) { |
| 3344 | | self.markRelocsDirtyByAddress(segment.vmaddr + segment.vmsize); |
| 3345 | | try self.growSectionVirtualMemory(sect_id, needed_size); |
| 3346 | | } |
| 3347 | | |
| 3348 | | header.size = needed_size; |
| 3349 | | segment.filesize = mem.alignForward(u64, needed_size, page_size); |
| 3350 | | segment.vmsize = mem.alignForward(u64, needed_size, page_size); |
| 3351 | | } |
| 3352 | | |
| 3353 | | fn growSectionVirtualMemory(self: *MachO, sect_id: u8, needed_size: u64) !void { |
| 3354 | | const target = self.base.comp.root_mod.resolved_target.result; |
| 3355 | | const page_size = getPageSize(target.cpu.arch); |
| 3356 | | const header = &self.sections.items(.header)[sect_id]; |
| 3357 | | const segment = self.getSegmentPtr(sect_id); |
| 3358 | | const increased_size = padToIdeal(needed_size); |
| 3359 | | const old_aligned_end = segment.vmaddr + segment.vmsize; |
| 3360 | | const new_aligned_end = segment.vmaddr + mem.alignForward(u64, increased_size, page_size); |
| 3361 | | const diff = new_aligned_end - old_aligned_end; |
| 3362 | | log.debug("shifting every segment after {s},{s} in virtual memory by {x}", .{ |
| 3363 | | header.segName(), |
| 3364 | | header.sectName(), |
| 3365 | | diff, |
| 3366 | | }); |
| 3367 | | |
| 3368 | | // TODO: enforce order by increasing VM addresses in self.sections container. |
| 3369 | | for (self.sections.items(.header)[sect_id + 1 ..], 0..) |*next_header, next_sect_id| { |
| 3370 | | const index = @as(u8, @intCast(sect_id + 1 + next_sect_id)); |
| 3371 | | const next_segment = self.getSegmentPtr(index); |
| 3372 | | next_header.addr += diff; |
| 3373 | | next_segment.vmaddr += diff; |
| 3374 | | |
| 3375 | | const maybe_last_atom_index = &self.sections.items(.last_atom_index)[index]; |
| 3376 | | if (maybe_last_atom_index.*) |last_atom_index| { |
| 3377 | | var atom_index = last_atom_index; |
| 3378 | | while (true) { |
| 3379 | | const atom = self.getAtom(atom_index); |
| 3380 | | const sym = atom.getSymbolPtr(self); |
| 3381 | | sym.n_value += diff; |
| 3382 | | |
| 3383 | | if (atom.prev_index) |prev_index| { |
| 3384 | | atom_index = prev_index; |
| 3385 | | } else break; |
| 3386 | | } |
| 3387 | | } |
| 3388 | | } |
| 3389 | | } |
| 3390 | | |
| 3391 | | pub fn addAtomToSection(self: *MachO, atom_index: Atom.Index) void { |
| 3392 | | assert(self.mode == .zld); |
| 3393 | | const atom = self.getAtomPtr(atom_index); |
| 3394 | | const sym = self.getSymbol(atom.getSymbolWithLoc()); |
| 3395 | | var section = self.sections.get(sym.n_sect - 1); |
| 3396 | | if (section.header.size > 0) { |
| 3397 | | const last_atom = self.getAtomPtr(section.last_atom_index.?); |
| 3398 | | last_atom.next_index = atom_index; |
| 3399 | | atom.prev_index = section.last_atom_index; |
| 3400 | | } else { |
| 3401 | | section.first_atom_index = atom_index; |
| 3402 | | } |
| 3403 | | section.last_atom_index = atom_index; |
| 3404 | | section.header.size += atom.size; |
| 3405 | | self.sections.set(sym.n_sect - 1, section); |
| 3406 | | } |
| 3407 | | |
| 3408 | | fn allocateAtom(self: *MachO, atom_index: Atom.Index, new_atom_size: u64, alignment: Alignment) !u64 { |
| 3409 | | const tracy = trace(@src()); |
| 3410 | | defer tracy.end(); |
| 3411 | | |
| 3412 | | assert(self.mode == .incremental); |
| 3413 | | |
| 3414 | | const atom = self.getAtom(atom_index); |
| 3415 | | const sect_id = atom.getSymbol(self).n_sect - 1; |
| 3416 | | const segment = self.getSegmentPtr(sect_id); |
| 3417 | | const header = &self.sections.items(.header)[sect_id]; |
| 3418 | | const free_list = &self.sections.items(.free_list)[sect_id]; |
| 3419 | | const maybe_last_atom_index = &self.sections.items(.last_atom_index)[sect_id]; |
| 3420 | | const requires_padding = blk: { |
| 3421 | | if (!header.isCode()) break :blk false; |
| 3422 | | if (header.isSymbolStubs()) break :blk false; |
| 3423 | | if (mem.eql(u8, "__stub_helper", header.sectName())) break :blk false; |
| 3424 | | break :blk true; |
| 3425 | | }; |
| 3426 | | const new_atom_ideal_capacity = if (requires_padding) padToIdeal(new_atom_size) else new_atom_size; |
| 3427 | | |
| 3428 | | // We use these to indicate our intention to update metadata, placing the new atom, |
| 3429 | | // and possibly removing a free list node. |
| 3430 | | // It would be simpler to do it inside the for loop below, but that would cause a |
| 3431 | | // problem if an error was returned later in the function. So this action |
| 3432 | | // is actually carried out at the end of the function, when errors are no longer possible. |
| 3433 | | var atom_placement: ?Atom.Index = null; |
| 3434 | | var free_list_removal: ?usize = null; |
| 3435 | | |
| 3436 | | // First we look for an appropriately sized free list node. |
| 3437 | | // The list is unordered. We'll just take the first thing that works. |
| 3438 | | const vaddr = blk: { |
| 3439 | | var i: usize = 0; |
| 3440 | | while (i < free_list.items.len) { |
| 3441 | | const big_atom_index = free_list.items[i]; |
| 3442 | | const big_atom = self.getAtom(big_atom_index); |
| 3443 | | // We now have a pointer to a live atom that has too much capacity. |
| 3444 | | // Is it enough that we could fit this new atom? |
| 3445 | | const sym = big_atom.getSymbol(self); |
| 3446 | | const capacity = big_atom.capacity(self); |
| 3447 | | const ideal_capacity = if (requires_padding) padToIdeal(capacity) else capacity; |
| 3448 | | const ideal_capacity_end_vaddr = math.add(u64, sym.n_value, ideal_capacity) catch ideal_capacity; |
| 3449 | | const capacity_end_vaddr = sym.n_value + capacity; |
| 3450 | | const new_start_vaddr_unaligned = capacity_end_vaddr - new_atom_ideal_capacity; |
| 3451 | | const new_start_vaddr = alignment.backward(new_start_vaddr_unaligned); |
| 3452 | | if (new_start_vaddr < ideal_capacity_end_vaddr) { |
| 3453 | | // Additional bookkeeping here to notice if this free list node |
| 3454 | | // should be deleted because the atom that it points to has grown to take up |
| 3455 | | // more of the extra capacity. |
| 3456 | | if (!big_atom.freeListEligible(self)) { |
| 3457 | | _ = free_list.swapRemove(i); |
| 3458 | | } else { |
| 3459 | | i += 1; |
| 3460 | | } |
| 3461 | | continue; |
| 3462 | | } |
| 3463 | | // At this point we know that we will place the new atom here. But the |
| 3464 | | // remaining question is whether there is still yet enough capacity left |
| 3465 | | // over for there to still be a free list node. |
| 3466 | | const remaining_capacity = new_start_vaddr - ideal_capacity_end_vaddr; |
| 3467 | | const keep_free_list_node = remaining_capacity >= min_text_capacity; |
| 3468 | | |
| 3469 | | // Set up the metadata to be updated, after errors are no longer possible. |
| 3470 | | atom_placement = big_atom_index; |
| 3471 | | if (!keep_free_list_node) { |
| 3472 | | free_list_removal = i; |
| 3473 | | } |
| 3474 | | break :blk new_start_vaddr; |
| 3475 | | } else if (maybe_last_atom_index.*) |last_index| { |
| 3476 | | const last = self.getAtom(last_index); |
| 3477 | | const last_symbol = last.getSymbol(self); |
| 3478 | | const ideal_capacity = if (requires_padding) padToIdeal(last.size) else last.size; |
| 3479 | | const ideal_capacity_end_vaddr = last_symbol.n_value + ideal_capacity; |
| 3480 | | const new_start_vaddr = alignment.forward(ideal_capacity_end_vaddr); |
| 3481 | | atom_placement = last_index; |
| 3482 | | break :blk new_start_vaddr; |
| 3483 | | } else { |
| 3484 | | break :blk alignment.forward(segment.vmaddr); |
| 3485 | | } |
| 3486 | | }; |
| 3487 | | |
| 3488 | | const expand_section = if (atom_placement) |placement_index| |
| 3489 | | self.getAtom(placement_index).next_index == null |
| 3490 | | else |
| 3491 | | true; |
| 3492 | | if (expand_section) { |
| 3493 | | const needed_size = (vaddr + new_atom_size) - segment.vmaddr; |
| 3494 | | try self.growSection(sect_id, needed_size); |
| 3495 | | maybe_last_atom_index.* = atom_index; |
| 3496 | | self.segment_table_dirty = true; |
| 3497 | | } |
| 3498 | | |
| 3499 | | assert(alignment != .none); |
| 3500 | | header.@"align" = @min(header.@"align", @intFromEnum(alignment)); |
| 3501 | | self.getAtomPtr(atom_index).size = new_atom_size; |
| 3502 | | |
| 3503 | | if (atom.prev_index) |prev_index| { |
| 3504 | | const prev = self.getAtomPtr(prev_index); |
| 3505 | | prev.next_index = atom.next_index; |
| 3506 | | } |
| 3507 | | if (atom.next_index) |next_index| { |
| 3508 | | const next = self.getAtomPtr(next_index); |
| 3509 | | next.prev_index = atom.prev_index; |
| 3510 | | } |
| 3511 | | |
| 3512 | | if (atom_placement) |big_atom_index| { |
| 3513 | | const big_atom = self.getAtomPtr(big_atom_index); |
| 3514 | | const atom_ptr = self.getAtomPtr(atom_index); |
| 3515 | | atom_ptr.prev_index = big_atom_index; |
| 3516 | | atom_ptr.next_index = big_atom.next_index; |
| 3517 | | big_atom.next_index = atom_index; |
| 3518 | | } else { |
| 3519 | | const atom_ptr = self.getAtomPtr(atom_index); |
| 3520 | | atom_ptr.prev_index = null; |
| 3521 | | atom_ptr.next_index = null; |
| 3522 | | } |
| 3523 | | if (free_list_removal) |i| { |
| 3524 | | _ = free_list.swapRemove(i); |
| 3525 | | } |
| 3526 | | |
| 3527 | | return vaddr; |
| 3528 | | } |
| 3529 | | |
| 3530 | | pub fn getGlobalSymbol(self: *MachO, name: []const u8, lib_name: ?[]const u8) !u32 { |
| 3531 | | _ = lib_name; |
| 3532 | | const gpa = self.base.comp.gpa; |
| 3533 | | const sym_name = try std.fmt.allocPrint(gpa, "_{s}", .{name}); |
| 3534 | | defer gpa.free(sym_name); |
| 3535 | | return self.addUndefined(sym_name, .{ .add_stub = true }); |
| 3536 | | } |
| 3537 | | |
| 3538 | | pub fn writeSegmentHeaders(self: *MachO, writer: anytype) !void { |
| 3539 | | for (self.segments.items, 0..) |seg, i| { |
| 3540 | | const indexes = self.getSectionIndexes(@intCast(i)); |
| 3541 | | var out_seg = seg; |
| 3542 | | out_seg.cmdsize = @sizeOf(macho.segment_command_64); |
| 3543 | | out_seg.nsects = 0; |
| 3544 | | |
| 3545 | | // Update section headers count; any section with size of 0 is excluded |
| 3546 | | // since it doesn't have any data in the final binary file. |
| 3547 | | for (self.sections.items(.header)[indexes.start..indexes.end]) |header| { |
| 3548 | | if (header.size == 0) continue; |
| 3549 | | out_seg.cmdsize += @sizeOf(macho.section_64); |
| 3550 | | out_seg.nsects += 1; |
| 3551 | | } |
| 3552 | | |
| 3553 | | if (out_seg.nsects == 0 and |
| 3554 | | (mem.eql(u8, out_seg.segName(), "__DATA_CONST") or |
| 3555 | | mem.eql(u8, out_seg.segName(), "__DATA"))) continue; |
| 3556 | | |
| 3557 | | try writer.writeStruct(out_seg); |
| 3558 | | for (self.sections.items(.header)[indexes.start..indexes.end]) |header| { |
| 3559 | | if (header.size == 0) continue; |
| 3560 | | try writer.writeStruct(header); |
| 3561 | | } |
| 3562 | | } |
| 3563 | | } |
| 3564 | | |
| 3565 | | pub fn writeLinkeditSegmentData(self: *MachO) !void { |
| 3566 | | const target = self.base.comp.root_mod.resolved_target.result; |
| 3567 | | const page_size = getPageSize(target.cpu.arch); |
| 3568 | | const seg = self.getLinkeditSegmentPtr(); |
| 3569 | | seg.filesize = 0; |
| 3570 | | seg.vmsize = 0; |
| 3571 | | |
| 3572 | | for (self.segments.items, 0..) |segment, id| { |
| 3573 | | if (self.linkedit_segment_cmd_index.? == @as(u8, @intCast(id))) continue; |
| 3574 | | if (seg.vmaddr < segment.vmaddr + segment.vmsize) { |
| 3575 | | seg.vmaddr = mem.alignForward(u64, segment.vmaddr + segment.vmsize, page_size); |
| 3576 | | } |
| 3577 | | if (seg.fileoff < segment.fileoff + segment.filesize) { |
| 3578 | | seg.fileoff = mem.alignForward(u64, segment.fileoff + segment.filesize, page_size); |
| 3579 | | } |
| 3580 | | } |
| 3581 | | |
| 3582 | | try self.writeDyldInfoData(); |
| 3583 | | // TODO handle this better |
| 3584 | | if (self.mode == .zld) { |
| 3585 | | try self.writeFunctionStarts(); |
| 3586 | | try self.writeDataInCode(); |
| 3587 | | } |
| 3588 | | try self.writeSymtabs(); |
| 3589 | | |
| 3590 | | seg.vmsize = mem.alignForward(u64, seg.filesize, page_size); |
| 3591 | | } |
| 3592 | | |
| 3593 | | fn collectRebaseDataFromTableSection(self: *MachO, sect_id: u8, rebase: *Rebase, table: anytype) !void { |
| 3594 | | const gpa = self.base.comp.gpa; |
| 3595 | | const header = self.sections.items(.header)[sect_id]; |
| 3596 | | const segment_index = self.sections.items(.segment_index)[sect_id]; |
| 3597 | | const segment = self.segments.items[segment_index]; |
| 3598 | | const base_offset = header.addr - segment.vmaddr; |
| 3599 | | const is_got = if (self.got_section_index) |index| index == sect_id else false; |
| 3600 | | |
| 3601 | | try rebase.entries.ensureUnusedCapacity(gpa, table.entries.items.len); |
| 3602 | | |
| 3603 | | for (table.entries.items, 0..) |entry, i| { |
| 3604 | | if (!table.lookup.contains(entry)) continue; |
| 3605 | | const sym = self.getSymbol(entry); |
| 3606 | | if (is_got and sym.undf()) continue; |
| 3607 | | const offset = i * @sizeOf(u64); |
| 3608 | | log.debug(" | rebase at {x}", .{base_offset + offset}); |
| 3609 | | rebase.entries.appendAssumeCapacity(.{ |
| 3610 | | .offset = base_offset + offset, |
| 3611 | | .segment_id = segment_index, |
| 3612 | | }); |
| 3613 | | } |
| 3614 | | } |
| 3615 | | |
| 3616 | | fn collectRebaseData(self: *MachO, rebase: *Rebase) !void { |
| 3617 | | const gpa = self.base.comp.gpa; |
| 3618 | | const slice = self.sections.slice(); |
| 3619 | | |
| 3620 | | for (self.rebases.keys(), 0..) |atom_index, i| { |
| 3621 | | const atom = self.getAtom(atom_index); |
| 3622 | | log.debug(" ATOM(%{?d}, '{s}')", .{ atom.getSymbolIndex(), atom.getName(self) }); |
| 3623 | | |
| 3624 | | const sym = atom.getSymbol(self); |
| 3625 | | const segment_index = slice.items(.segment_index)[sym.n_sect - 1]; |
| 3626 | | const seg = self.getSegment(sym.n_sect - 1); |
| 3627 | | |
| 3628 | | const base_offset = sym.n_value - seg.vmaddr; |
| 3629 | | |
| 3630 | | const rebases = self.rebases.values()[i]; |
| 3631 | | try rebase.entries.ensureUnusedCapacity(gpa, rebases.items.len); |
| 3632 | | |
| 3633 | | for (rebases.items) |offset| { |
| 3634 | | log.debug(" | rebase at {x}", .{base_offset + offset}); |
| 3635 | | |
| 3636 | | rebase.entries.appendAssumeCapacity(.{ |
| 3637 | | .offset = base_offset + offset, |
| 3638 | | .segment_id = segment_index, |
| 3639 | | }); |
| 3640 | | } |
| 3641 | | } |
| 3642 | | |
| 3643 | | // Unpack GOT entries |
| 3644 | | if (self.got_section_index) |sect_id| { |
| 3645 | | try self.collectRebaseDataFromTableSection(sect_id, rebase, self.got_table); |
| 3646 | | } |
| 3647 | | |
| 3648 | | // Next, unpack __la_symbol_ptr entries |
| 3649 | | if (self.la_symbol_ptr_section_index) |sect_id| { |
| 3650 | | try self.collectRebaseDataFromTableSection(sect_id, rebase, self.stub_table); |
| 3651 | | } |
| 3652 | | |
| 3653 | | // Finally, unpack the rest. |
| 3654 | | const target = self.base.comp.root_mod.resolved_target.result; |
| 3655 | | const cpu_arch = target.cpu.arch; |
| 3656 | | for (self.objects.items) |*object| { |
| 3657 | | for (object.atoms.items) |atom_index| { |
| 3658 | | const atom = self.getAtom(atom_index); |
| 3659 | | const sym = self.getSymbol(atom.getSymbolWithLoc()); |
| 3660 | | if (sym.n_desc == N_DEAD) continue; |
| 3661 | | if (sym.n_desc == N_BOUNDARY) continue; |
| 3662 | | |
| 3663 | | const sect_id = sym.n_sect - 1; |
| 3664 | | const section = self.sections.items(.header)[sect_id]; |
| 3665 | | const segment_id = self.sections.items(.segment_index)[sect_id]; |
| 3666 | | const segment = self.segments.items[segment_id]; |
| 3667 | | if (segment.maxprot & macho.PROT.WRITE == 0) continue; |
| 3668 | | switch (section.type()) { |
| 3669 | | macho.S_LITERAL_POINTERS, |
| 3670 | | macho.S_REGULAR, |
| 3671 | | macho.S_MOD_INIT_FUNC_POINTERS, |
| 3672 | | macho.S_MOD_TERM_FUNC_POINTERS, |
| 3673 | | => {}, |
| 3674 | | else => continue, |
| 3675 | | } |
| 3676 | | |
| 3677 | | log.debug(" ATOM({d}, %{d}, '{s}')", .{ |
| 3678 | | atom_index, |
| 3679 | | atom.sym_index, |
| 3680 | | self.getSymbolName(atom.getSymbolWithLoc()), |
| 3681 | | }); |
| 3682 | | |
| 3683 | | const code = Atom.getAtomCode(self, atom_index); |
| 3684 | | const relocs = Atom.getAtomRelocs(self, atom_index); |
| 3685 | | const ctx = Atom.getRelocContext(self, atom_index); |
| 3686 | | |
| 3687 | | for (relocs) |rel| { |
| 3688 | | switch (cpu_arch) { |
| 3689 | | .aarch64 => { |
| 3690 | | const rel_type = @as(macho.reloc_type_arm64, @enumFromInt(rel.r_type)); |
| 3691 | | if (rel_type != .ARM64_RELOC_UNSIGNED) continue; |
| 3692 | | if (rel.r_length != 3) continue; |
| 3693 | | }, |
| 3694 | | .x86_64 => { |
| 3695 | | const rel_type = @as(macho.reloc_type_x86_64, @enumFromInt(rel.r_type)); |
| 3696 | | if (rel_type != .X86_64_RELOC_UNSIGNED) continue; |
| 3697 | | if (rel.r_length != 3) continue; |
| 3698 | | }, |
| 3699 | | else => unreachable, |
| 3700 | | } |
| 3701 | | const reloc_target = Atom.parseRelocTarget(self, .{ |
| 3702 | | .object_id = atom.getFile().?, |
| 3703 | | .rel = rel, |
| 3704 | | .code = code, |
| 3705 | | .base_offset = ctx.base_offset, |
| 3706 | | .base_addr = ctx.base_addr, |
| 3707 | | }); |
| 3708 | | const target_sym = self.getSymbol(reloc_target); |
| 3709 | | if (target_sym.undf()) continue; |
| 3710 | | |
| 3711 | | const base_offset = @as(i32, @intCast(sym.n_value - segment.vmaddr)); |
| 3712 | | const rel_offset = rel.r_address - ctx.base_offset; |
| 3713 | | const offset = @as(u64, @intCast(base_offset + rel_offset)); |
| 3714 | | log.debug(" | rebase at {x}", .{offset}); |
| 3715 | | |
| 3716 | | try rebase.entries.append(gpa, .{ |
| 3717 | | .offset = offset, |
| 3718 | | .segment_id = segment_id, |
| 3719 | | }); |
| 3720 | | } |
| 3721 | | } |
| 3722 | | } |
| 3723 | | |
| 3724 | | try rebase.finalize(gpa); |
| 3725 | | } |
| 3726 | | |
| 3727 | | fn collectBindDataFromTableSection(self: *MachO, sect_id: u8, bind: anytype, table: anytype) !void { |
| 3728 | | const gpa = self.base.comp.gpa; |
| 3729 | | const header = self.sections.items(.header)[sect_id]; |
| 3730 | | const segment_index = self.sections.items(.segment_index)[sect_id]; |
| 3731 | | const segment = self.segments.items[segment_index]; |
| 3732 | | const base_offset = header.addr - segment.vmaddr; |
| 3733 | | |
| 3734 | | try bind.entries.ensureUnusedCapacity(gpa, table.entries.items.len); |
| 3735 | | |
| 3736 | | for (table.entries.items, 0..) |entry, i| { |
| 3737 | | if (!table.lookup.contains(entry)) continue; |
| 3738 | | const bind_sym = self.getSymbol(entry); |
| 3739 | | if (!bind_sym.undf()) continue; |
| 3740 | | const offset = i * @sizeOf(u64); |
| 3741 | | log.debug(" | bind at {x}, import('{s}') in dylib({d})", .{ |
| 3742 | | base_offset + offset, |
| 3743 | | self.getSymbolName(entry), |
| 3744 | | @divTrunc(@as(i16, @bitCast(bind_sym.n_desc)), macho.N_SYMBOL_RESOLVER), |
| 3745 | | }); |
| 3746 | | if (bind_sym.weakRef()) { |
| 3747 | | log.debug(" | marking as weak ref ", .{}); |
| 3748 | | } |
| 3749 | | bind.entries.appendAssumeCapacity(.{ |
| 3750 | | .target = entry, |
| 3751 | | .offset = base_offset + offset, |
| 3752 | | .segment_id = segment_index, |
| 3753 | | .addend = 0, |
| 3754 | | }); |
| 3755 | | } |
| 3756 | | } |
| 3757 | | |
| 3758 | | fn collectBindData(self: *MachO, bind: anytype, raw_bindings: anytype) !void { |
| 3759 | | const gpa = self.base.comp.gpa; |
| 3760 | | const slice = self.sections.slice(); |
| 3761 | | |
| 3762 | | for (raw_bindings.keys(), 0..) |atom_index, i| { |
| 3763 | | const atom = self.getAtom(atom_index); |
| 3764 | | log.debug(" ATOM(%{?d}, '{s}')", .{ atom.getSymbolIndex(), atom.getName(self) }); |
| 3765 | | |
| 3766 | | const sym = atom.getSymbol(self); |
| 3767 | | const segment_index = slice.items(.segment_index)[sym.n_sect - 1]; |
| 3768 | | const seg = self.getSegment(sym.n_sect - 1); |
| 3769 | | |
| 3770 | | const base_offset = sym.n_value - seg.vmaddr; |
| 3771 | | |
| 3772 | | const bindings = raw_bindings.values()[i]; |
| 3773 | | try bind.entries.ensureUnusedCapacity(gpa, bindings.items.len); |
| 3774 | | |
| 3775 | | for (bindings.items) |binding| { |
| 3776 | | const bind_sym = self.getSymbol(binding.target); |
| 3777 | | const bind_sym_name = self.getSymbolName(binding.target); |
| 3778 | | const dylib_ordinal = @divTrunc( |
| 3779 | | @as(i16, @bitCast(bind_sym.n_desc)), |
| 3780 | | macho.N_SYMBOL_RESOLVER, |
| 3781 | | ); |
| 3782 | | log.debug(" | bind at {x}, import('{s}') in dylib({d})", .{ |
| 3783 | | binding.offset + base_offset, |
| 3784 | | bind_sym_name, |
| 3785 | | dylib_ordinal, |
| 3786 | | }); |
| 3787 | | if (bind_sym.weakRef()) { |
| 3788 | | log.debug(" | marking as weak ref ", .{}); |
| 3789 | | } |
| 3790 | | bind.entries.appendAssumeCapacity(.{ |
| 3791 | | .target = binding.target, |
| 3792 | | .offset = binding.offset + base_offset, |
| 3793 | | .segment_id = segment_index, |
| 3794 | | .addend = 0, |
| 3795 | | }); |
| 3796 | | } |
| 3797 | | } |
| 3798 | | |
| 3799 | | // Unpack GOT pointers |
| 3800 | | if (self.got_section_index) |sect_id| { |
| 3801 | | try self.collectBindDataFromTableSection(sect_id, bind, self.got_table); |
| 3802 | | } |
| 3803 | | |
| 3804 | | // Next, unpack TLV pointers section |
| 3805 | | if (self.tlv_ptr_section_index) |sect_id| { |
| 3806 | | try self.collectBindDataFromTableSection(sect_id, bind, self.tlv_ptr_table); |
| 3807 | | } |
| 3808 | | |
| 3809 | | // Finally, unpack the rest. |
| 3810 | | const target = self.base.comp.root_mod.resolved_target.result; |
| 3811 | | const cpu_arch = target.cpu.arch; |
| 3812 | | for (self.objects.items) |*object| { |
| 3813 | | for (object.atoms.items) |atom_index| { |
| 3814 | | const atom = self.getAtom(atom_index); |
| 3815 | | const sym = self.getSymbol(atom.getSymbolWithLoc()); |
| 3816 | | if (sym.n_desc == N_DEAD) continue; |
| 3817 | | if (sym.n_desc == N_BOUNDARY) continue; |
| 3818 | | |
| 3819 | | const sect_id = sym.n_sect - 1; |
| 3820 | | const section = self.sections.items(.header)[sect_id]; |
| 3821 | | const segment_id = self.sections.items(.segment_index)[sect_id]; |
| 3822 | | const segment = self.segments.items[segment_id]; |
| 3823 | | if (segment.maxprot & macho.PROT.WRITE == 0) continue; |
| 3824 | | switch (section.type()) { |
| 3825 | | macho.S_LITERAL_POINTERS, |
| 3826 | | macho.S_REGULAR, |
| 3827 | | macho.S_MOD_INIT_FUNC_POINTERS, |
| 3828 | | macho.S_MOD_TERM_FUNC_POINTERS, |
| 3829 | | => {}, |
| 3830 | | else => continue, |
| 3831 | | } |
| 3832 | | |
| 3833 | | log.debug(" ATOM({d}, %{d}, '{s}')", .{ |
| 3834 | | atom_index, |
| 3835 | | atom.sym_index, |
| 3836 | | self.getSymbolName(atom.getSymbolWithLoc()), |
| 3837 | | }); |
| 3838 | | |
| 3839 | | const code = Atom.getAtomCode(self, atom_index); |
| 3840 | | const relocs = Atom.getAtomRelocs(self, atom_index); |
| 3841 | | const ctx = Atom.getRelocContext(self, atom_index); |
| 3842 | | |
| 3843 | | for (relocs) |rel| { |
| 3844 | | switch (cpu_arch) { |
| 3845 | | .aarch64 => { |
| 3846 | | const rel_type = @as(macho.reloc_type_arm64, @enumFromInt(rel.r_type)); |
| 3847 | | if (rel_type != .ARM64_RELOC_UNSIGNED) continue; |
| 3848 | | if (rel.r_length != 3) continue; |
| 3849 | | }, |
| 3850 | | .x86_64 => { |
| 3851 | | const rel_type = @as(macho.reloc_type_x86_64, @enumFromInt(rel.r_type)); |
| 3852 | | if (rel_type != .X86_64_RELOC_UNSIGNED) continue; |
| 3853 | | if (rel.r_length != 3) continue; |
| 3854 | | }, |
| 3855 | | else => unreachable, |
| 3856 | | } |
| 3857 | | |
| 3858 | | const global = Atom.parseRelocTarget(self, .{ |
| 3859 | | .object_id = atom.getFile().?, |
| 3860 | | .rel = rel, |
| 3861 | | .code = code, |
| 3862 | | .base_offset = ctx.base_offset, |
| 3863 | | .base_addr = ctx.base_addr, |
| 3864 | | }); |
| 3865 | | const bind_sym_name = self.getSymbolName(global); |
| 3866 | | const bind_sym = self.getSymbol(global); |
| 3867 | | if (!bind_sym.undf()) continue; |
| 3868 | | |
| 3869 | | const base_offset = sym.n_value - segment.vmaddr; |
| 3870 | | const rel_offset = @as(u32, @intCast(rel.r_address - ctx.base_offset)); |
| 3871 | | const offset = @as(u64, @intCast(base_offset + rel_offset)); |
| 3872 | | const addend = mem.readInt(i64, code[rel_offset..][0..8], .little); |
| 3873 | | |
| 3874 | | const dylib_ordinal = @divTrunc(@as(i16, @bitCast(bind_sym.n_desc)), macho.N_SYMBOL_RESOLVER); |
| 3875 | | log.debug(" | bind at {x}, import('{s}') in dylib({d})", .{ |
| 3876 | | base_offset, |
| 3877 | | bind_sym_name, |
| 3878 | | dylib_ordinal, |
| 3879 | | }); |
| 3880 | | log.debug(" | with addend {x}", .{addend}); |
| 3881 | | if (bind_sym.weakRef()) { |
| 3882 | | log.debug(" | marking as weak ref ", .{}); |
| 3883 | | } |
| 3884 | | try bind.entries.append(gpa, .{ |
| 3885 | | .target = global, |
| 3886 | | .offset = offset, |
| 3887 | | .segment_id = segment_id, |
| 3888 | | .addend = addend, |
| 3889 | | }); |
| 3890 | | } |
| 3891 | | } |
| 3892 | | } |
| 3893 | | |
| 3894 | | try bind.finalize(gpa, self); |
| 3895 | | } |
| 3896 | | |
| 3897 | | fn collectLazyBindData(self: *MachO, bind: anytype) !void { |
| 3898 | | const sect_id = self.la_symbol_ptr_section_index orelse return; |
| 3899 | | const gpa = self.base.comp.gpa; |
| 3900 | | try self.collectBindDataFromTableSection(sect_id, bind, self.stub_table); |
| 3901 | | try bind.finalize(gpa, self); |
| 3902 | | } |
| 3903 | | |
| 3904 | | fn collectExportData(self: *MachO, trie: *Trie) !void { |
| 3905 | | const gpa = self.base.comp.gpa; |
| 3906 | | |
| 3907 | | // TODO handle macho.EXPORT_SYMBOL_FLAGS_REEXPORT and macho.EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER. |
| 3908 | | log.debug("generating export trie", .{}); |
| 3909 | | |
| 3910 | | const exec_segment = self.segments.items[self.header_segment_cmd_index.?]; |
| 3911 | | const base_address = exec_segment.vmaddr; |
| 3912 | | |
| 3913 | | for (self.globals.items) |global| { |
| 3914 | | const sym = self.getSymbol(global); |
| 3915 | | |
| 3916 | | if (sym.undf()) continue; |
| 3917 | | assert(sym.ext()); |
| 3918 | | if (sym.n_desc == N_DEAD) continue; |
| 3919 | | if (sym.n_desc == N_BOUNDARY) continue; |
| 3920 | | |
| 3921 | | const sym_name = self.getSymbolName(global); |
| 3922 | | log.debug(" (putting '{s}' defined at 0x{x})", .{ sym_name, sym.n_value }); |
| 3923 | | try trie.put(gpa, .{ |
| 3924 | | .name = sym_name, |
| 3925 | | .vmaddr_offset = sym.n_value - base_address, |
| 3926 | | .export_flags = macho.EXPORT_SYMBOL_FLAGS_KIND_REGULAR, |
| 3927 | | }); |
| 3928 | | } |
| 3929 | | |
| 3930 | | try trie.finalize(gpa); |
| 3931 | | } |
| 3932 | | |
| 3933 | | fn writeDyldInfoData(self: *MachO) !void { |
| 3934 | | const tracy = trace(@src()); |
| 3935 | | defer tracy.end(); |
| 3936 | | |
| 3937 | | const gpa = self.base.comp.gpa; |
| 3938 | | |
| 3939 | | var rebase = Rebase{}; |
| 3940 | | defer rebase.deinit(gpa); |
| 3941 | | try self.collectRebaseData(&rebase); |
| 3942 | | |
| 3943 | | var bind = Bind{}; |
| 3944 | | defer bind.deinit(gpa); |
| 3945 | | try self.collectBindData(&bind, self.bindings); |
| 3946 | | |
| 3947 | | var lazy_bind = LazyBind{}; |
| 3948 | | defer lazy_bind.deinit(gpa); |
| 3949 | | try self.collectLazyBindData(&lazy_bind); |
| 3950 | | |
| 3951 | | var trie: Trie = .{}; |
| 3952 | | defer trie.deinit(gpa); |
| 3953 | | try trie.init(gpa); |
| 3954 | | try self.collectExportData(&trie); |
| 3955 | | |
| 3956 | | const link_seg = self.getLinkeditSegmentPtr(); |
| 3957 | | assert(mem.isAlignedGeneric(u64, link_seg.fileoff, @alignOf(u64))); |
| 3958 | | const rebase_off = link_seg.fileoff; |
| 3959 | | const rebase_size = rebase.size(); |
| 3960 | | const rebase_size_aligned = mem.alignForward(u64, rebase_size, @alignOf(u64)); |
| 3961 | | log.debug("writing rebase info from 0x{x} to 0x{x}", .{ rebase_off, rebase_off + rebase_size_aligned }); |
| 3962 | | |
| 3963 | | const bind_off = rebase_off + rebase_size_aligned; |
| 3964 | | const bind_size = bind.size(); |
| 3965 | | const bind_size_aligned = mem.alignForward(u64, bind_size, @alignOf(u64)); |
| 3966 | | log.debug("writing bind info from 0x{x} to 0x{x}", .{ bind_off, bind_off + bind_size_aligned }); |
| 3967 | | |
| 3968 | | const lazy_bind_off = bind_off + bind_size_aligned; |
| 3969 | | const lazy_bind_size = lazy_bind.size(); |
| 3970 | | const lazy_bind_size_aligned = mem.alignForward(u64, lazy_bind_size, @alignOf(u64)); |
| 3971 | | log.debug("writing lazy bind info from 0x{x} to 0x{x}", .{ |
| 3972 | | lazy_bind_off, |
| 3973 | | lazy_bind_off + lazy_bind_size_aligned, |
| 3974 | | }); |
| 3975 | | |
| 3976 | | const export_off = lazy_bind_off + lazy_bind_size_aligned; |
| 3977 | | const export_size = trie.size; |
| 3978 | | const export_size_aligned = mem.alignForward(u64, export_size, @alignOf(u64)); |
| 3979 | | log.debug("writing export trie from 0x{x} to 0x{x}", .{ export_off, export_off + export_size_aligned }); |
| 3980 | | |
| 3981 | | const needed_size = math.cast(usize, export_off + export_size_aligned - rebase_off) orelse |
| 3982 | | return error.Overflow; |
| 3983 | | link_seg.filesize = needed_size; |
| 3984 | | assert(mem.isAlignedGeneric(u64, link_seg.fileoff + link_seg.filesize, @alignOf(u64))); |
| 3985 | | |
| 3986 | | const buffer = try gpa.alloc(u8, needed_size); |
| 3987 | | defer gpa.free(buffer); |
| 3988 | | @memset(buffer, 0); |
| 3989 | | |
| 3990 | | var stream = std.io.fixedBufferStream(buffer); |
| 3991 | | const writer = stream.writer(); |
| 3992 | | |
| 3993 | | try rebase.write(writer); |
| 3994 | | try stream.seekTo(bind_off - rebase_off); |
| 3995 | | |
| 3996 | | try bind.write(writer); |
| 3997 | | try stream.seekTo(lazy_bind_off - rebase_off); |
| 3998 | | |
| 3999 | | try lazy_bind.write(writer); |
| 4000 | | try stream.seekTo(export_off - rebase_off); |
| 4001 | | |
| 4002 | | _ = try trie.write(writer); |
| 4003 | | |
| 4004 | | log.debug("writing dyld info from 0x{x} to 0x{x}", .{ |
| 4005 | | rebase_off, |
| 4006 | | rebase_off + needed_size, |
| 4007 | | }); |
| 4008 | | |
| 4009 | | try self.base.file.?.pwriteAll(buffer, rebase_off); |
| 4010 | | try self.populateLazyBindOffsetsInStubHelper(lazy_bind); |
| 4011 | | |
| 4012 | | self.dyld_info_cmd.rebase_off = @as(u32, @intCast(rebase_off)); |
| 4013 | | self.dyld_info_cmd.rebase_size = @as(u32, @intCast(rebase_size_aligned)); |
| 4014 | | self.dyld_info_cmd.bind_off = @as(u32, @intCast(bind_off)); |
| 4015 | | self.dyld_info_cmd.bind_size = @as(u32, @intCast(bind_size_aligned)); |
| 4016 | | self.dyld_info_cmd.lazy_bind_off = @as(u32, @intCast(lazy_bind_off)); |
| 4017 | | self.dyld_info_cmd.lazy_bind_size = @as(u32, @intCast(lazy_bind_size_aligned)); |
| 4018 | | self.dyld_info_cmd.export_off = @as(u32, @intCast(export_off)); |
| 4019 | | self.dyld_info_cmd.export_size = @as(u32, @intCast(export_size_aligned)); |
| 4020 | | } |
| 4021 | | |
| 4022 | | fn populateLazyBindOffsetsInStubHelper(self: *MachO, lazy_bind: anytype) !void { |
| 4023 | | if (lazy_bind.size() == 0) return; |
| 4024 | | |
| 4025 | | const stub_helper_section_index = self.stub_helper_section_index.?; |
| 4026 | | // assert(ctx.stub_helper_preamble_allocated); |
| 4027 | | |
| 4028 | | const header = self.sections.items(.header)[stub_helper_section_index]; |
| 4029 | | |
| 4030 | | const target = self.base.comp.root_mod.resolved_target.result; |
| 4031 | | const cpu_arch = target.cpu.arch; |
| 4032 | | const preamble_size = stubs.stubHelperPreambleSize(cpu_arch); |
| 4033 | | const stub_size = stubs.stubHelperSize(cpu_arch); |
| 4034 | | const stub_offset = stubs.stubOffsetInStubHelper(cpu_arch); |
| 4035 | | const base_offset = header.offset + preamble_size; |
| 4036 | | |
| 4037 | | for (lazy_bind.offsets.items, 0..) |bind_offset, index| { |
| 4038 | | const file_offset = base_offset + index * stub_size + stub_offset; |
| 4039 | | |
| 4040 | | log.debug("writing lazy bind offset 0x{x} ({s}) in stub helper at 0x{x}", .{ |
| 4041 | | bind_offset, |
| 4042 | | self.getSymbolName(lazy_bind.entries.items[index].target), |
| 4043 | | file_offset, |
| 4044 | | }); |
| 4045 | | |
| 4046 | | try self.base.file.?.pwriteAll(mem.asBytes(&bind_offset), file_offset); |
| 4047 | | } |
| 4048 | | } |
| 4049 | | |
| 4050 | | const asc_u64 = std.sort.asc(u64); |
| 4051 | | |
| 4052 | | fn addSymbolToFunctionStarts(self: *MachO, sym_loc: SymbolWithLoc, addresses: *std.ArrayList(u64)) !void { |
| 4053 | | const sym = self.getSymbol(sym_loc); |
| 4054 | | if (sym.n_strx == 0) return; |
| 4055 | | if (sym.n_desc == N_DEAD) return; |
| 4056 | | if (sym.n_desc == N_BOUNDARY) return; |
| 4057 | | if (self.symbolIsTemp(sym_loc)) return; |
| 4058 | | try addresses.append(sym.n_value); |
| 4059 | | } |
| 4060 | | |
| 4061 | | fn writeFunctionStarts(self: *MachO) !void { |
| 4062 | | const gpa = self.base.comp.gpa; |
| 4063 | | const seg = self.segments.items[self.header_segment_cmd_index.?]; |
| 4064 | | |
| 4065 | | // We need to sort by address first |
| 4066 | | var addresses = std.ArrayList(u64).init(gpa); |
| 4067 | | defer addresses.deinit(); |
| 4068 | | |
| 4069 | | for (self.objects.items) |object| { |
| 4070 | | for (object.exec_atoms.items) |atom_index| { |
| 4071 | | const atom = self.getAtom(atom_index); |
| 4072 | | const sym_loc = atom.getSymbolWithLoc(); |
| 4073 | | try self.addSymbolToFunctionStarts(sym_loc, &addresses); |
| 4074 | | |
| 4075 | | var it = Atom.getInnerSymbolsIterator(self, atom_index); |
| 4076 | | while (it.next()) |inner_sym_loc| { |
| 4077 | | try self.addSymbolToFunctionStarts(inner_sym_loc, &addresses); |
| 4078 | | } |
| 4079 | | } |
| 4080 | | } |
| 4081 | | |
| 4082 | | mem.sort(u64, addresses.items, {}, asc_u64); |
| 4083 | | |
| 4084 | | var offsets = std.ArrayList(u32).init(gpa); |
| 4085 | | defer offsets.deinit(); |
| 4086 | | try offsets.ensureTotalCapacityPrecise(addresses.items.len); |
| 4087 | | |
| 4088 | | var last_off: u32 = 0; |
| 4089 | | for (addresses.items) |addr| { |
| 4090 | | const offset = @as(u32, @intCast(addr - seg.vmaddr)); |
| 4091 | | const diff = offset - last_off; |
| 4092 | | |
| 4093 | | if (diff == 0) continue; |
| 4094 | | |
| 4095 | | offsets.appendAssumeCapacity(diff); |
| 4096 | | last_off = offset; |
| 4097 | | } |
| 4098 | | |
| 4099 | | var buffer = std.ArrayList(u8).init(gpa); |
| 4100 | | defer buffer.deinit(); |
| 4101 | | |
| 4102 | | const max_size = @as(usize, @intCast(offsets.items.len * @sizeOf(u64))); |
| 4103 | | try buffer.ensureTotalCapacity(max_size); |
| 4104 | | |
| 4105 | | for (offsets.items) |offset| { |
| 4106 | | try std.leb.writeULEB128(buffer.writer(), offset); |
| 4107 | | } |
| 4108 | | |
| 4109 | | const link_seg = self.getLinkeditSegmentPtr(); |
| 4110 | | const offset = link_seg.fileoff + link_seg.filesize; |
| 4111 | | assert(mem.isAlignedGeneric(u64, offset, @alignOf(u64))); |
| 4112 | | const needed_size = buffer.items.len; |
| 4113 | | const needed_size_aligned = mem.alignForward(u64, needed_size, @alignOf(u64)); |
| 4114 | | const padding = math.cast(usize, needed_size_aligned - needed_size) orelse return error.Overflow; |
| 4115 | | if (padding > 0) { |
| 4116 | | try buffer.ensureUnusedCapacity(padding); |
| 4117 | | buffer.appendNTimesAssumeCapacity(0, padding); |
| 4118 | | } |
| 4119 | | link_seg.filesize = offset + needed_size_aligned - link_seg.fileoff; |
| 4120 | | |
| 4121 | | log.debug("writing function starts info from 0x{x} to 0x{x}", .{ offset, offset + needed_size_aligned }); |
| 4122 | | |
| 4123 | | try self.base.file.?.pwriteAll(buffer.items, offset); |
| 4124 | | |
| 4125 | | self.function_starts_cmd.dataoff = @as(u32, @intCast(offset)); |
| 4126 | | self.function_starts_cmd.datasize = @as(u32, @intCast(needed_size_aligned)); |
| 4127 | | } |
| 4128 | | |
| 4129 | | fn filterDataInCode( |
| 4130 | | dices: []const macho.data_in_code_entry, |
| 4131 | | start_addr: u64, |
| 4132 | | end_addr: u64, |
| 4133 | | ) []const macho.data_in_code_entry { |
| 4134 | | const Predicate = struct { |
| 4135 | | addr: u64, |
| 4136 | | |
| 4137 | | pub fn predicate(self: @This(), dice: macho.data_in_code_entry) bool { |
| 4138 | | return dice.offset >= self.addr; |
| 4139 | | } |
| 4140 | | }; |
| 4141 | | |
| 4142 | | const start = MachO.lsearch(macho.data_in_code_entry, dices, Predicate{ .addr = start_addr }); |
| 4143 | | const end = MachO.lsearch(macho.data_in_code_entry, dices[start..], Predicate{ .addr = end_addr }) + start; |
| 4144 | | |
| 4145 | | return dices[start..end]; |
| 4146 | | } |
| 4147 | | |
| 4148 | | pub fn writeDataInCode(self: *MachO) !void { |
| 4149 | | const gpa = self.base.comp.gpa; |
| 4150 | | var out_dice = std.ArrayList(macho.data_in_code_entry).init(gpa); |
| 4151 | | defer out_dice.deinit(); |
| 4152 | | |
| 4153 | | const text_sect_id = self.text_section_index orelse return; |
| 4154 | | const text_sect_header = self.sections.items(.header)[text_sect_id]; |
| 4155 | | |
| 4156 | | for (self.objects.items) |object| { |
| 4157 | | if (!object.hasDataInCode()) continue; |
| 4158 | | const dice = object.data_in_code.items; |
| 4159 | | try out_dice.ensureUnusedCapacity(dice.len); |
| 4160 | | |
| 4161 | | for (object.exec_atoms.items) |atom_index| { |
| 4162 | | const atom = self.getAtom(atom_index); |
| 4163 | | const sym = self.getSymbol(atom.getSymbolWithLoc()); |
| 4164 | | if (sym.n_desc == N_DEAD) continue; |
| 4165 | | if (sym.n_desc == N_BOUNDARY) return; |
| 4166 | | |
| 4167 | | const source_addr = if (object.getSourceSymbol(atom.sym_index)) |source_sym| |
| 4168 | | source_sym.n_value |
| 4169 | | else blk: { |
| 4170 | | const nbase = @as(u32, @intCast(object.in_symtab.?.len)); |
| 4171 | | const source_sect_id = @as(u8, @intCast(atom.sym_index - nbase)); |
| 4172 | | break :blk object.getSourceSection(source_sect_id).addr; |
| 4173 | | }; |
| 4174 | | const filtered_dice = filterDataInCode(dice, source_addr, source_addr + atom.size); |
| 4175 | | const base = math.cast(u32, sym.n_value - text_sect_header.addr + text_sect_header.offset) orelse |
| 4176 | | return error.Overflow; |
| 4177 | | |
| 4178 | | for (filtered_dice) |single| { |
| 4179 | | const offset = math.cast(u32, single.offset - source_addr + base) orelse |
| 4180 | | return error.Overflow; |
| 4181 | | out_dice.appendAssumeCapacity(.{ |
| 4182 | | .offset = offset, |
| 4183 | | .length = single.length, |
| 4184 | | .kind = single.kind, |
| 4185 | | }); |
| 4186 | | } |
| 4187 | | } |
| 4188 | | } |
| 4189 | | |
| 4190 | | const seg = self.getLinkeditSegmentPtr(); |
| 4191 | | const offset = seg.fileoff + seg.filesize; |
| 4192 | | assert(mem.isAlignedGeneric(u64, offset, @alignOf(u64))); |
| 4193 | | const needed_size = out_dice.items.len * @sizeOf(macho.data_in_code_entry); |
| 4194 | | const needed_size_aligned = mem.alignForward(u64, needed_size, @alignOf(u64)); |
| 4195 | | seg.filesize = offset + needed_size_aligned - seg.fileoff; |
| 4196 | | |
| 4197 | | const buffer = try gpa.alloc(u8, math.cast(usize, needed_size_aligned) orelse return error.Overflow); |
| 4198 | | defer gpa.free(buffer); |
| 4199 | | { |
| 4200 | | const src = mem.sliceAsBytes(out_dice.items); |
| 4201 | | @memcpy(buffer[0..src.len], src); |
| 4202 | | @memset(buffer[src.len..], 0); |
| 4203 | | } |
| 4204 | | |
| 4205 | | log.debug("writing data-in-code from 0x{x} to 0x{x}", .{ offset, offset + needed_size_aligned }); |
| 4206 | | |
| 4207 | | try self.base.file.?.pwriteAll(buffer, offset); |
| 4208 | | |
| 4209 | | self.data_in_code_cmd.dataoff = @as(u32, @intCast(offset)); |
| 4210 | | self.data_in_code_cmd.datasize = @as(u32, @intCast(needed_size_aligned)); |
| 4211 | | } |
| 4212 | | |
| 4213 | | fn writeSymtabs(self: *MachO) !void { |
| 4214 | | var ctx = try self.writeSymtab(); |
| 4215 | | defer ctx.imports_table.deinit(); |
| 4216 | | try self.writeDysymtab(ctx); |
| 4217 | | try self.writeStrtab(); |
| 4218 | | } |
| 4219 | | |
| 4220 | | fn addLocalToSymtab(self: *MachO, sym_loc: SymbolWithLoc, locals: *std.ArrayList(macho.nlist_64)) !void { |
| 4221 | | const sym = self.getSymbol(sym_loc); |
| 4222 | | if (sym.n_strx == 0) return; // no name, skip |
| 4223 | | if (sym.n_desc == N_DEAD) return; // garbage-collected, skip |
| 4224 | | if (sym.n_desc == N_BOUNDARY) return; // boundary symbol, skip |
| 4225 | | if (sym.ext()) return; // an export lands in its own symtab section, skip |
| 4226 | | if (self.symbolIsTemp(sym_loc)) return; // local temp symbol, skip |
| 4227 | | const gpa = self.base.comp.gpa; |
| 4228 | | var out_sym = sym; |
| 4229 | | out_sym.n_strx = try self.strtab.insert(gpa, self.getSymbolName(sym_loc)); |
| 4230 | | try locals.append(out_sym); |
| 4231 | | } |
| 4232 | | |
| 4233 | | fn writeSymtab(self: *MachO) !SymtabCtx { |
| 4234 | | const comp = self.base.comp; |
| 4235 | | const gpa = comp.gpa; |
| 4236 | | |
| 4237 | | var locals = std.ArrayList(macho.nlist_64).init(gpa); |
| 4238 | | defer locals.deinit(); |
| 4239 | | |
| 4240 | | for (0..self.locals.items.len) |sym_id| { |
| 4241 | | try self.addLocalToSymtab(.{ .sym_index = @intCast(sym_id) }, &locals); |
| 4242 | | } |
| 4243 | | |
| 4244 | | for (self.objects.items) |object| { |
| 4245 | | for (object.atoms.items) |atom_index| { |
| 4246 | | const atom = self.getAtom(atom_index); |
| 4247 | | const sym_loc = atom.getSymbolWithLoc(); |
| 4248 | | try self.addLocalToSymtab(sym_loc, &locals); |
| 4249 | | |
| 4250 | | var it = Atom.getInnerSymbolsIterator(self, atom_index); |
| 4251 | | while (it.next()) |inner_sym_loc| { |
| 4252 | | try self.addLocalToSymtab(inner_sym_loc, &locals); |
| 4253 | | } |
| 4254 | | } |
| 4255 | | } |
| 4256 | | |
| 4257 | | var exports = std.ArrayList(macho.nlist_64).init(gpa); |
| 4258 | | defer exports.deinit(); |
| 4259 | | |
| 4260 | | for (self.globals.items) |global| { |
| 4261 | | const sym = self.getSymbol(global); |
| 4262 | | if (sym.undf()) continue; // import, skip |
| 4263 | | if (sym.n_desc == N_DEAD) continue; |
| 4264 | | if (sym.n_desc == N_BOUNDARY) continue; |
| 4265 | | var out_sym = sym; |
| 4266 | | out_sym.n_strx = try self.strtab.insert(gpa, self.getSymbolName(global)); |
| 4267 | | try exports.append(out_sym); |
| 4268 | | } |
| 4269 | | |
| 4270 | | var imports = std.ArrayList(macho.nlist_64).init(gpa); |
| 4271 | | defer imports.deinit(); |
| 4272 | | |
| 4273 | | var imports_table = std.AutoHashMap(SymbolWithLoc, u32).init(gpa); |
| 4274 | | |
| 4275 | | for (self.globals.items) |global| { |
| 4276 | | const sym = self.getSymbol(global); |
| 4277 | | if (sym.n_strx == 0) continue; // no name, skip |
| 4278 | | if (!sym.undf()) continue; // not an import, skip |
| 4279 | | if (sym.n_desc == N_DEAD) continue; |
| 4280 | | if (sym.n_desc == N_BOUNDARY) continue; |
| 4281 | | const new_index = @as(u32, @intCast(imports.items.len)); |
| 4282 | | var out_sym = sym; |
| 4283 | | out_sym.n_strx = try self.strtab.insert(gpa, self.getSymbolName(global)); |
| 4284 | | try imports.append(out_sym); |
| 4285 | | try imports_table.putNoClobber(global, new_index); |
| 4286 | | } |
| 4287 | | |
| 4288 | | // We generate stabs last in order to ensure that the strtab always has debug info |
| 4289 | | // strings trailing |
| 4290 | | if (comp.config.debug_format != .strip) { |
| 4291 | | for (self.objects.items) |object| { |
| 4292 | | assert(self.d_sym == null); // TODO |
| 4293 | | try self.generateSymbolStabs(object, &locals); |
| 4294 | | } |
| 4295 | | } |
| 4296 | | |
| 4297 | | const nlocals = @as(u32, @intCast(locals.items.len)); |
| 4298 | | const nexports = @as(u32, @intCast(exports.items.len)); |
| 4299 | | const nimports = @as(u32, @intCast(imports.items.len)); |
| 4300 | | const nsyms = nlocals + nexports + nimports; |
| 4301 | | |
| 4302 | | const seg = self.getLinkeditSegmentPtr(); |
| 4303 | | const offset = seg.fileoff + seg.filesize; |
| 4304 | | assert(mem.isAlignedGeneric(u64, offset, @alignOf(u64))); |
| 4305 | | const needed_size = nsyms * @sizeOf(macho.nlist_64); |
| 4306 | | seg.filesize = offset + needed_size - seg.fileoff; |
| 4307 | | assert(mem.isAlignedGeneric(u64, seg.fileoff + seg.filesize, @alignOf(u64))); |
| 4308 | | |
| 4309 | | var buffer = std.ArrayList(u8).init(gpa); |
| 4310 | | defer buffer.deinit(); |
| 4311 | | try buffer.ensureTotalCapacityPrecise(needed_size); |
| 4312 | | buffer.appendSliceAssumeCapacity(mem.sliceAsBytes(locals.items)); |
| 4313 | | buffer.appendSliceAssumeCapacity(mem.sliceAsBytes(exports.items)); |
| 4314 | | buffer.appendSliceAssumeCapacity(mem.sliceAsBytes(imports.items)); |
| 4315 | | |
| 4316 | | log.debug("writing symtab from 0x{x} to 0x{x}", .{ offset, offset + needed_size }); |
| 4317 | | try self.base.file.?.pwriteAll(buffer.items, offset); |
| 4318 | | |
| 4319 | | self.symtab_cmd.symoff = @as(u32, @intCast(offset)); |
| 4320 | | self.symtab_cmd.nsyms = nsyms; |
| 4321 | | |
| 4322 | | return SymtabCtx{ |
| 4323 | | .nlocalsym = nlocals, |
| 4324 | | .nextdefsym = nexports, |
| 4325 | | .nundefsym = nimports, |
| 4326 | | .imports_table = imports_table, |
| 4327 | | }; |
| 484 | fn shrinkAtom(self: *MachO, atom_index: Atom.Index, new_block_size: u64) void { |
| 485 | _ = self; |
| 486 | _ = atom_index; |
| 487 | _ = new_block_size; |
| 488 | // TODO check the new capacity, and if it crosses the size threshold into a big enough |
| 489 | // capacity, insert a free list node for it. |
| 4328 | 490 | } |
| 4329 | 491 | |
| 4330 | | // TODO this function currently skips generating symbol stabs in case errors are encountered in DWARF data. |
| 4331 | | // I think we should actually report those errors to the user and let them decide if they want to strip debug info |
| 4332 | | // in that case or not. |
| 4333 | | fn generateSymbolStabs( |
| 4334 | | self: *MachO, |
| 4335 | | object: Object, |
| 4336 | | locals: *std.ArrayList(macho.nlist_64), |
| 4337 | | ) !void { |
| 4338 | | log.debug("generating stabs for '{s}'", .{object.name}); |
| 4339 | | |
| 4340 | | const gpa = self.base.comp.gpa; |
| 4341 | | var debug_info = object.parseDwarfInfo(); |
| 4342 | | |
| 4343 | | var lookup = DwarfInfo.AbbrevLookupTable.init(gpa); |
| 4344 | | defer lookup.deinit(); |
| 4345 | | try lookup.ensureUnusedCapacity(std.math.maxInt(u8)); |
| 4346 | | |
| 4347 | | // We assume there is only one CU. |
| 4348 | | var cu_it = debug_info.getCompileUnitIterator(); |
| 4349 | | const compile_unit = while (try cu_it.next()) |cu| { |
| 4350 | | const offset = math.cast(usize, cu.cuh.debug_abbrev_offset) orelse return error.Overflow; |
| 4351 | | try debug_info.genAbbrevLookupByKind(offset, &lookup); |
| 4352 | | break cu; |
| 4353 | | } else { |
| 4354 | | log.debug("no compile unit found in debug info in {s}; skipping", .{object.name}); |
| 4355 | | return; |
| 4356 | | }; |
| 4357 | | |
| 4358 | | var abbrev_it = compile_unit.getAbbrevEntryIterator(debug_info); |
| 4359 | | const maybe_cu_entry: ?DwarfInfo.AbbrevEntry = blk: { |
| 4360 | | while (abbrev_it.next(lookup) catch break :blk null) |entry| switch (entry.tag) { |
| 4361 | | dwarf.TAG.compile_unit => break :blk entry, |
| 4362 | | else => continue, |
| 4363 | | } else break :blk null; |
| 4364 | | }; |
| 4365 | | |
| 4366 | | const cu_entry = maybe_cu_entry orelse { |
| 4367 | | log.debug("missing DWARF_TAG_compile_unit tag in {s}; skipping", .{object.name}); |
| 4368 | | return; |
| 4369 | | }; |
| 4370 | | |
| 4371 | | var maybe_tu_name: ?[]const u8 = null; |
| 4372 | | var maybe_tu_comp_dir: ?[]const u8 = null; |
| 4373 | | var attr_it = cu_entry.getAttributeIterator(debug_info, compile_unit.cuh); |
| 4374 | | |
| 4375 | | blk: { |
| 4376 | | while (attr_it.next() catch break :blk) |attr| switch (attr.name) { |
| 4377 | | dwarf.AT.comp_dir => maybe_tu_comp_dir = attr.getString(debug_info, compile_unit.cuh) orelse continue, |
| 4378 | | dwarf.AT.name => maybe_tu_name = attr.getString(debug_info, compile_unit.cuh) orelse continue, |
| 4379 | | else => continue, |
| 4380 | | }; |
| 4381 | | } |
| 4382 | | |
| 4383 | | if (maybe_tu_name == null or maybe_tu_comp_dir == null) { |
| 4384 | | log.debug("missing DWARF_AT_comp_dir and DWARF_AT_name attributes {s}; skipping", .{object.name}); |
| 4385 | | return; |
| 4386 | | } |
| 4387 | | |
| 4388 | | const tu_name = maybe_tu_name.?; |
| 4389 | | const tu_comp_dir = maybe_tu_comp_dir.?; |
| 4390 | | |
| 4391 | | // Open scope |
| 4392 | | try locals.ensureUnusedCapacity(3); |
| 4393 | | locals.appendAssumeCapacity(.{ |
| 4394 | | .n_strx = try self.strtab.insert(gpa, tu_comp_dir), |
| 4395 | | .n_type = macho.N_SO, |
| 4396 | | .n_sect = 0, |
| 4397 | | .n_desc = 0, |
| 4398 | | .n_value = 0, |
| 4399 | | }); |
| 4400 | | locals.appendAssumeCapacity(.{ |
| 4401 | | .n_strx = try self.strtab.insert(gpa, tu_name), |
| 4402 | | .n_type = macho.N_SO, |
| 4403 | | .n_sect = 0, |
| 4404 | | .n_desc = 0, |
| 4405 | | .n_value = 0, |
| 4406 | | }); |
| 4407 | | locals.appendAssumeCapacity(.{ |
| 4408 | | .n_strx = try self.strtab.insert(gpa, object.name), |
| 4409 | | .n_type = macho.N_OSO, |
| 4410 | | .n_sect = 0, |
| 4411 | | .n_desc = 1, |
| 4412 | | .n_value = object.mtime, |
| 4413 | | }); |
| 4414 | | |
| 4415 | | var stabs_buf: [4]macho.nlist_64 = undefined; |
| 4416 | | |
| 4417 | | var name_lookup: ?DwarfInfo.SubprogramLookupByName = if (object.header.flags & macho.MH_SUBSECTIONS_VIA_SYMBOLS == 0) blk: { |
| 4418 | | var name_lookup = DwarfInfo.SubprogramLookupByName.init(gpa); |
| 4419 | | errdefer name_lookup.deinit(); |
| 4420 | | try name_lookup.ensureUnusedCapacity(@as(u32, @intCast(object.atoms.items.len))); |
| 4421 | | debug_info.genSubprogramLookupByName(compile_unit, lookup, &name_lookup) catch |err| switch (err) { |
| 4422 | | error.UnhandledDwFormValue => {}, // TODO I don't like the fact we constantly re-iterate and hit this; we should validate once a priori |
| 4423 | | else => |e| return e, |
| 4424 | | }; |
| 4425 | | break :blk name_lookup; |
| 4426 | | } else null; |
| 4427 | | defer if (name_lookup) |*nl| nl.deinit(); |
| 4428 | | |
| 4429 | | for (object.atoms.items) |atom_index| { |
| 4430 | | const atom = self.getAtom(atom_index); |
| 4431 | | const stabs = try self.generateSymbolStabsForSymbol( |
| 4432 | | atom_index, |
| 4433 | | atom.getSymbolWithLoc(), |
| 4434 | | name_lookup, |
| 4435 | | &stabs_buf, |
| 4436 | | ); |
| 4437 | | try locals.appendSlice(stabs); |
| 4438 | | |
| 4439 | | var it = Atom.getInnerSymbolsIterator(self, atom_index); |
| 4440 | | while (it.next()) |sym_loc| { |
| 4441 | | const contained_stabs = try self.generateSymbolStabsForSymbol( |
| 4442 | | atom_index, |
| 4443 | | sym_loc, |
| 4444 | | name_lookup, |
| 4445 | | &stabs_buf, |
| 4446 | | ); |
| 4447 | | try locals.appendSlice(contained_stabs); |
| 4448 | | } |
| 4449 | | } |
| 4450 | | |
| 4451 | | // Close scope |
| 4452 | | try locals.append(.{ |
| 4453 | | .n_strx = 0, |
| 4454 | | .n_type = macho.N_SO, |
| 4455 | | .n_sect = 0, |
| 4456 | | .n_desc = 0, |
| 4457 | | .n_value = 0, |
| 4458 | | }); |
| 492 | fn growAtom(self: *MachO, atom_index: Atom.Index, new_atom_size: u64, alignment: Alignment) !u64 { |
| 493 | _ = self; |
| 494 | _ = atom_index; |
| 495 | _ = new_atom_size; |
| 496 | _ = alignment; |
| 497 | @panic("TODO growAtom"); |
| 4459 | 498 | } |
| 4460 | 499 | |
| 4461 | | fn generateSymbolStabsForSymbol( |
| 4462 | | self: *MachO, |
| 4463 | | atom_index: Atom.Index, |
| 4464 | | sym_loc: SymbolWithLoc, |
| 4465 | | lookup: ?DwarfInfo.SubprogramLookupByName, |
| 4466 | | buf: *[4]macho.nlist_64, |
| 4467 | | ) ![]const macho.nlist_64 { |
| 4468 | | const gpa = self.base.comp.gpa; |
| 4469 | | const object = self.objects.items[sym_loc.getFile().?]; |
| 4470 | | const sym = self.getSymbol(sym_loc); |
| 4471 | | const sym_name = self.getSymbolName(sym_loc); |
| 4472 | | const header = self.sections.items(.header)[sym.n_sect - 1]; |
| 4473 | | |
| 4474 | | if (sym.n_strx == 0) return buf[0..0]; |
| 4475 | | if (self.symbolIsTemp(sym_loc)) return buf[0..0]; |
| 4476 | | |
| 4477 | | if (!header.isCode()) { |
| 4478 | | // Since we are not dealing with machine code, it's either a global or a static depending |
| 4479 | | // on the linkage scope. |
| 4480 | | if (sym.sect() and sym.ext()) { |
| 4481 | | // Global gets an N_GSYM stab type. |
| 4482 | | buf[0] = .{ |
| 4483 | | .n_strx = try self.strtab.insert(gpa, sym_name), |
| 4484 | | .n_type = macho.N_GSYM, |
| 4485 | | .n_sect = sym.n_sect, |
| 4486 | | .n_desc = 0, |
| 4487 | | .n_value = 0, |
| 4488 | | }; |
| 4489 | | } else { |
| 4490 | | // Local static gets an N_STSYM stab type. |
| 4491 | | buf[0] = .{ |
| 4492 | | .n_strx = try self.strtab.insert(gpa, sym_name), |
| 4493 | | .n_type = macho.N_STSYM, |
| 4494 | | .n_sect = sym.n_sect, |
| 4495 | | .n_desc = 0, |
| 4496 | | .n_value = sym.n_value, |
| 4497 | | }; |
| 4498 | | } |
| 4499 | | return buf[0..1]; |
| 500 | pub fn updateFunc(self: *MachO, mod: *Module, func_index: InternPool.Index, air: Air, liveness: Liveness) !void { |
| 501 | if (build_options.skip_non_native and builtin.object_format != .macho) { |
| 502 | @panic("Attempted to compile for object format that was disabled by build configuration"); |
| 4500 | 503 | } |
| 504 | if (self.llvm_object) |llvm_object| return llvm_object.updateFunc(mod, func_index, air, liveness); |
| 4501 | 505 | |
| 4502 | | const size: u64 = size: { |
| 4503 | | if (object.header.flags & macho.MH_SUBSECTIONS_VIA_SYMBOLS != 0) { |
| 4504 | | break :size self.getAtom(atom_index).size; |
| 4505 | | } |
| 4506 | | |
| 4507 | | // Since we don't have subsections to work with, we need to infer the size of each function |
| 4508 | | // the slow way by scanning the debug info for matching symbol names and extracting |
| 4509 | | // the symbol's DWARF_AT_low_pc and DWARF_AT_high_pc values. |
| 4510 | | const source_sym = object.getSourceSymbol(sym_loc.sym_index) orelse return buf[0..0]; |
| 4511 | | const subprogram = lookup.?.get(sym_name[1..]) orelse return buf[0..0]; |
| 4512 | | |
| 4513 | | if (subprogram.addr <= source_sym.n_value and source_sym.n_value < subprogram.addr + subprogram.size) { |
| 4514 | | break :size subprogram.size; |
| 4515 | | } else { |
| 4516 | | log.debug("no stab found for {s}", .{sym_name}); |
| 4517 | | return buf[0..0]; |
| 4518 | | } |
| 4519 | | }; |
| 4520 | | |
| 4521 | | buf[0] = .{ |
| 4522 | | .n_strx = 0, |
| 4523 | | .n_type = macho.N_BNSYM, |
| 4524 | | .n_sect = sym.n_sect, |
| 4525 | | .n_desc = 0, |
| 4526 | | .n_value = sym.n_value, |
| 4527 | | }; |
| 4528 | | buf[1] = .{ |
| 4529 | | .n_strx = try self.strtab.insert(gpa, sym_name), |
| 4530 | | .n_type = macho.N_FUN, |
| 4531 | | .n_sect = sym.n_sect, |
| 4532 | | .n_desc = 0, |
| 4533 | | .n_value = sym.n_value, |
| 4534 | | }; |
| 4535 | | buf[2] = .{ |
| 4536 | | .n_strx = 0, |
| 4537 | | .n_type = macho.N_FUN, |
| 4538 | | .n_sect = 0, |
| 4539 | | .n_desc = 0, |
| 4540 | | .n_value = size, |
| 4541 | | }; |
| 4542 | | buf[3] = .{ |
| 4543 | | .n_strx = 0, |
| 4544 | | .n_type = macho.N_ENSYM, |
| 4545 | | .n_sect = sym.n_sect, |
| 4546 | | .n_desc = 0, |
| 4547 | | .n_value = size, |
| 4548 | | }; |
| 4549 | | |
| 4550 | | return buf; |
| 506 | @panic("TODO updateFunc"); |
| 4551 | 507 | } |
| 4552 | 508 | |
| 4553 | | pub fn writeStrtab(self: *MachO) !void { |
| 4554 | | const gpa = self.base.comp.gpa; |
| 4555 | | const seg = self.getLinkeditSegmentPtr(); |
| 4556 | | const offset = seg.fileoff + seg.filesize; |
| 4557 | | assert(mem.isAlignedGeneric(u64, offset, @alignOf(u64))); |
| 4558 | | const needed_size = self.strtab.buffer.items.len; |
| 4559 | | const needed_size_aligned = mem.alignForward(u64, needed_size, @alignOf(u64)); |
| 4560 | | seg.filesize = offset + needed_size_aligned - seg.fileoff; |
| 4561 | | |
| 4562 | | log.debug("writing string table from 0x{x} to 0x{x}", .{ offset, offset + needed_size_aligned }); |
| 4563 | | |
| 4564 | | const buffer = try gpa.alloc(u8, math.cast(usize, needed_size_aligned) orelse return error.Overflow); |
| 4565 | | defer gpa.free(buffer); |
| 4566 | | @memcpy(buffer[0..self.strtab.buffer.items.len], self.strtab.buffer.items); |
| 4567 | | @memset(buffer[self.strtab.buffer.items.len..], 0); |
| 4568 | | |
| 4569 | | try self.base.file.?.pwriteAll(buffer, offset); |
| 509 | pub fn lowerUnnamedConst(self: *MachO, typed_value: TypedValue, decl_index: InternPool.DeclIndex) !u32 { |
| 510 | _ = self; |
| 511 | _ = typed_value; |
| 512 | _ = decl_index; |
| 4570 | 513 | |
| 4571 | | self.symtab_cmd.stroff = @as(u32, @intCast(offset)); |
| 4572 | | self.symtab_cmd.strsize = @as(u32, @intCast(needed_size_aligned)); |
| 514 | @panic("TODO lowerUnnamedConst"); |
| 4573 | 515 | } |
| 4574 | 516 | |
| 4575 | | const SymtabCtx = struct { |
| 4576 | | nlocalsym: u32, |
| 4577 | | nextdefsym: u32, |
| 4578 | | nundefsym: u32, |
| 4579 | | imports_table: std.AutoHashMap(SymbolWithLoc, u32), |
| 517 | const LowerConstResult = union(enum) { |
| 518 | ok: Atom.Index, |
| 519 | fail: *Module.ErrorMsg, |
| 4580 | 520 | }; |
| 4581 | 521 | |
| 4582 | | pub fn writeDysymtab(self: *MachO, ctx: SymtabCtx) !void { |
| 4583 | | const gpa = self.base.comp.gpa; |
| 4584 | | const nstubs = @as(u32, @intCast(self.stub_table.lookup.count())); |
| 4585 | | const ngot_entries = @as(u32, @intCast(self.got_table.lookup.count())); |
| 4586 | | const nindirectsyms = nstubs * 2 + ngot_entries; |
| 4587 | | const iextdefsym = ctx.nlocalsym; |
| 4588 | | const iundefsym = iextdefsym + ctx.nextdefsym; |
| 4589 | | |
| 4590 | | const seg = self.getLinkeditSegmentPtr(); |
| 4591 | | const offset = seg.fileoff + seg.filesize; |
| 4592 | | assert(mem.isAlignedGeneric(u64, offset, @alignOf(u64))); |
| 4593 | | const needed_size = nindirectsyms * @sizeOf(u32); |
| 4594 | | const needed_size_aligned = mem.alignForward(u64, needed_size, @alignOf(u64)); |
| 4595 | | seg.filesize = offset + needed_size_aligned - seg.fileoff; |
| 4596 | | |
| 4597 | | log.debug("writing indirect symbol table from 0x{x} to 0x{x}", .{ offset, offset + needed_size_aligned }); |
| 4598 | | |
| 4599 | | var buf = std.ArrayList(u8).init(gpa); |
| 4600 | | defer buf.deinit(); |
| 4601 | | try buf.ensureTotalCapacity(math.cast(usize, needed_size_aligned) orelse return error.Overflow); |
| 4602 | | const writer = buf.writer(); |
| 4603 | | |
| 4604 | | if (self.stubs_section_index) |sect_id| { |
| 4605 | | const stubs_header = &self.sections.items(.header)[sect_id]; |
| 4606 | | stubs_header.reserved1 = 0; |
| 4607 | | for (self.stub_table.entries.items) |entry| { |
| 4608 | | if (!self.stub_table.lookup.contains(entry)) continue; |
| 4609 | | const target_sym = self.getSymbol(entry); |
| 4610 | | assert(target_sym.undf()); |
| 4611 | | try writer.writeInt(u32, iundefsym + ctx.imports_table.get(entry).?, .little); |
| 4612 | | } |
| 4613 | | } |
| 4614 | | |
| 4615 | | if (self.got_section_index) |sect_id| { |
| 4616 | | const got = &self.sections.items(.header)[sect_id]; |
| 4617 | | got.reserved1 = nstubs; |
| 4618 | | for (self.got_table.entries.items) |entry| { |
| 4619 | | if (!self.got_table.lookup.contains(entry)) continue; |
| 4620 | | const target_sym = self.getSymbol(entry); |
| 4621 | | if (target_sym.undf()) { |
| 4622 | | try writer.writeInt(u32, iundefsym + ctx.imports_table.get(entry).?, .little); |
| 4623 | | } else { |
| 4624 | | try writer.writeInt(u32, macho.INDIRECT_SYMBOL_LOCAL, .little); |
| 4625 | | } |
| 4626 | | } |
| 4627 | | } |
| 4628 | | |
| 4629 | | if (self.la_symbol_ptr_section_index) |sect_id| { |
| 4630 | | const la_symbol_ptr = &self.sections.items(.header)[sect_id]; |
| 4631 | | la_symbol_ptr.reserved1 = nstubs + ngot_entries; |
| 4632 | | for (self.stub_table.entries.items) |entry| { |
| 4633 | | if (!self.stub_table.lookup.contains(entry)) continue; |
| 4634 | | const target_sym = self.getSymbol(entry); |
| 4635 | | assert(target_sym.undf()); |
| 4636 | | try writer.writeInt(u32, iundefsym + ctx.imports_table.get(entry).?, .little); |
| 4637 | | } |
| 4638 | | } |
| 4639 | | |
| 4640 | | const padding = math.cast(usize, needed_size_aligned - needed_size) orelse return error.Overflow; |
| 4641 | | if (padding > 0) { |
| 4642 | | buf.appendNTimesAssumeCapacity(0, padding); |
| 4643 | | } |
| 4644 | | |
| 4645 | | assert(buf.items.len == needed_size_aligned); |
| 4646 | | try self.base.file.?.pwriteAll(buf.items, offset); |
| 4647 | | |
| 4648 | | self.dysymtab_cmd.nlocalsym = ctx.nlocalsym; |
| 4649 | | self.dysymtab_cmd.iextdefsym = iextdefsym; |
| 4650 | | self.dysymtab_cmd.nextdefsym = ctx.nextdefsym; |
| 4651 | | self.dysymtab_cmd.iundefsym = iundefsym; |
| 4652 | | self.dysymtab_cmd.nundefsym = ctx.nundefsym; |
| 4653 | | self.dysymtab_cmd.indirectsymoff = @as(u32, @intCast(offset)); |
| 4654 | | self.dysymtab_cmd.nindirectsyms = nindirectsyms; |
| 4655 | | } |
| 4656 | | |
| 4657 | | pub fn writeUuid(self: *MachO, comp: *const Compilation, uuid_cmd_offset: u32, has_codesig: bool) !void { |
| 4658 | | const file_size = if (!has_codesig) blk: { |
| 4659 | | const seg = self.getLinkeditSegmentPtr(); |
| 4660 | | break :blk seg.fileoff + seg.filesize; |
| 4661 | | } else self.codesig_cmd.dataoff; |
| 4662 | | try calcUuid(comp, self.base.file.?, file_size, &self.uuid_cmd.uuid); |
| 4663 | | const offset = uuid_cmd_offset + @sizeOf(macho.load_command); |
| 4664 | | try self.base.file.?.pwriteAll(&self.uuid_cmd.uuid, offset); |
| 4665 | | } |
| 4666 | | |
| 4667 | | pub fn writeCodeSignaturePadding(self: *MachO, code_sig: *CodeSignature) !void { |
| 4668 | | const target = self.base.comp.root_mod.resolved_target.result; |
| 4669 | | const seg = self.getLinkeditSegmentPtr(); |
| 4670 | | // Code signature data has to be 16-bytes aligned for Apple tools to recognize the file |
| 4671 | | // https://github.com/opensource-apple/cctools/blob/fdb4825f303fd5c0751be524babd32958181b3ed/libstuff/checkout.c#L271 |
| 4672 | | const offset = mem.alignForward(u64, seg.fileoff + seg.filesize, 16); |
| 4673 | | const needed_size = code_sig.estimateSize(offset); |
| 4674 | | seg.filesize = offset + needed_size - seg.fileoff; |
| 4675 | | seg.vmsize = mem.alignForward(u64, seg.filesize, getPageSize(target.cpu.arch)); |
| 4676 | | log.debug("writing code signature padding from 0x{x} to 0x{x}", .{ offset, offset + needed_size }); |
| 4677 | | // Pad out the space. We need to do this to calculate valid hashes for everything in the file |
| 4678 | | // except for code signature data. |
| 4679 | | try self.base.file.?.pwriteAll(&[_]u8{0}, offset + needed_size - 1); |
| 4680 | | |
| 4681 | | self.codesig_cmd.dataoff = @as(u32, @intCast(offset)); |
| 4682 | | self.codesig_cmd.datasize = @as(u32, @intCast(needed_size)); |
| 4683 | | } |
| 4684 | | |
| 4685 | | pub fn writeCodeSignature(self: *MachO, comp: *const Compilation, code_sig: *CodeSignature) !void { |
| 4686 | | const output_mode = self.base.comp.config.output_mode; |
| 4687 | | const seg_id = self.header_segment_cmd_index.?; |
| 4688 | | const seg = self.segments.items[seg_id]; |
| 4689 | | const offset = self.codesig_cmd.dataoff; |
| 4690 | | |
| 4691 | | const gpa = self.base.comp.gpa; |
| 4692 | | var buffer = std.ArrayList(u8).init(gpa); |
| 4693 | | defer buffer.deinit(); |
| 4694 | | try buffer.ensureTotalCapacityPrecise(code_sig.size()); |
| 4695 | | try code_sig.writeAdhocSignature(comp, .{ |
| 4696 | | .file = self.base.file.?, |
| 4697 | | .exec_seg_base = seg.fileoff, |
| 4698 | | .exec_seg_limit = seg.filesize, |
| 4699 | | .file_size = offset, |
| 4700 | | .output_mode = output_mode, |
| 4701 | | }, buffer.writer()); |
| 4702 | | assert(buffer.items.len == code_sig.size()); |
| 4703 | | |
| 4704 | | log.debug("writing code signature from 0x{x} to 0x{x}", .{ |
| 4705 | | offset, |
| 4706 | | offset + buffer.items.len, |
| 4707 | | }); |
| 4708 | | |
| 4709 | | try self.base.file.?.pwriteAll(buffer.items, offset); |
| 4710 | | } |
| 4711 | | |
| 4712 | | /// Writes Mach-O file header. |
| 4713 | | pub fn writeHeader(self: *MachO, ncmds: u32, sizeofcmds: u32) !void { |
| 4714 | | const output_mode = self.base.comp.config.output_mode; |
| 4715 | | |
| 4716 | | var header: macho.mach_header_64 = .{}; |
| 4717 | | header.flags = macho.MH_NOUNDEFS | macho.MH_DYLDLINK | macho.MH_PIE | macho.MH_TWOLEVEL; |
| 4718 | | |
| 4719 | | const target = self.base.comp.root_mod.resolved_target.result; |
| 4720 | | switch (target.cpu.arch) { |
| 4721 | | .aarch64 => { |
| 4722 | | header.cputype = macho.CPU_TYPE_ARM64; |
| 4723 | | header.cpusubtype = macho.CPU_SUBTYPE_ARM_ALL; |
| 4724 | | }, |
| 4725 | | .x86_64 => { |
| 4726 | | header.cputype = macho.CPU_TYPE_X86_64; |
| 4727 | | header.cpusubtype = macho.CPU_SUBTYPE_X86_64_ALL; |
| 4728 | | }, |
| 4729 | | else => unreachable, |
| 4730 | | } |
| 4731 | | |
| 4732 | | switch (output_mode) { |
| 4733 | | .Exe => { |
| 4734 | | header.filetype = macho.MH_EXECUTE; |
| 4735 | | }, |
| 4736 | | .Lib => { |
| 4737 | | // By this point, it can only be a dylib. |
| 4738 | | header.filetype = macho.MH_DYLIB; |
| 4739 | | header.flags |= macho.MH_NO_REEXPORTED_DYLIBS; |
| 4740 | | }, |
| 4741 | | else => unreachable, |
| 4742 | | } |
| 4743 | | |
| 4744 | | if (self.thread_vars_section_index) |sect_id| { |
| 4745 | | header.flags |= macho.MH_HAS_TLV_DESCRIPTORS; |
| 4746 | | if (self.sections.items(.header)[sect_id].size > 0) { |
| 4747 | | header.flags |= macho.MH_HAS_TLV_DESCRIPTORS; |
| 4748 | | } |
| 4749 | | } |
| 4750 | | |
| 4751 | | header.ncmds = ncmds; |
| 4752 | | header.sizeofcmds = sizeofcmds; |
| 4753 | | |
| 4754 | | log.debug("writing Mach-O header {}", .{header}); |
| 4755 | | |
| 4756 | | try self.base.file.?.pwriteAll(mem.asBytes(&header), 0); |
| 4757 | | } |
| 4758 | | |
| 4759 | | pub fn padToIdeal(actual_size: anytype) @TypeOf(actual_size) { |
| 4760 | | return actual_size +| (actual_size / ideal_factor); |
| 4761 | | } |
| 4762 | | |
| 4763 | | fn detectAllocCollision(self: *MachO, start: u64, size: u64) ?u64 { |
| 4764 | | // TODO: header and load commands have to be part of the __TEXT segment |
| 4765 | | const header_size = self.segments.items[self.header_segment_cmd_index.?].filesize; |
| 4766 | | if (start < header_size) |
| 4767 | | return header_size; |
| 4768 | | |
| 4769 | | const end = start + padToIdeal(size); |
| 4770 | | |
| 4771 | | for (self.sections.items(.header)) |header| { |
| 4772 | | const tight_size = header.size; |
| 4773 | | const increased_size = padToIdeal(tight_size); |
| 4774 | | const test_end = header.offset + increased_size; |
| 4775 | | if (end > header.offset and start < test_end) { |
| 4776 | | return test_end; |
| 4777 | | } |
| 4778 | | } |
| 4779 | | |
| 4780 | | return null; |
| 4781 | | } |
| 4782 | | |
| 4783 | | fn allocatedSize(self: *MachO, start: u64) u64 { |
| 4784 | | if (start == 0) |
| 4785 | | return 0; |
| 4786 | | var min_pos: u64 = std.math.maxInt(u64); |
| 4787 | | for (self.sections.items(.header)) |header| { |
| 4788 | | if (header.offset <= start) continue; |
| 4789 | | if (header.offset < min_pos) min_pos = header.offset; |
| 4790 | | } |
| 4791 | | return min_pos - start; |
| 4792 | | } |
| 4793 | | |
| 4794 | | fn findFreeSpace(self: *MachO, object_size: u64, min_alignment: u32) u64 { |
| 4795 | | var start: u64 = 0; |
| 4796 | | while (self.detectAllocCollision(start, object_size)) |item_end| { |
| 4797 | | start = mem.alignForward(u64, item_end, min_alignment); |
| 4798 | | } |
| 4799 | | return start; |
| 4800 | | } |
| 4801 | | |
| 4802 | | pub fn allocatedVirtualSize(self: *MachO, start: u64) u64 { |
| 4803 | | if (start == 0) |
| 4804 | | return 0; |
| 4805 | | var min_pos: u64 = std.math.maxInt(u64); |
| 4806 | | for (self.sections.items(.segment_index)) |seg_id| { |
| 4807 | | const segment = self.segments.items[seg_id]; |
| 4808 | | if (segment.vmaddr <= start) continue; |
| 4809 | | if (segment.vmaddr < min_pos) min_pos = segment.vmaddr; |
| 4810 | | } |
| 4811 | | return min_pos - start; |
| 4812 | | } |
| 4813 | | |
| 4814 | | pub fn ptraceAttach(self: *MachO, pid: std.os.pid_t) !void { |
| 4815 | | if (!is_hot_update_compatible) return; |
| 4816 | | |
| 4817 | | const mach_task = try std.os.darwin.machTaskForPid(pid); |
| 4818 | | log.debug("Mach task for pid {d}: {any}", .{ pid, mach_task }); |
| 4819 | | self.hot_state.mach_task = mach_task; |
| 4820 | | |
| 4821 | | // TODO start exception handler in another thread |
| 4822 | | |
| 4823 | | // TODO enable ones we register for exceptions |
| 4824 | | // try std.os.ptrace(std.os.darwin.PT.ATTACHEXC, pid, 0, 0); |
| 4825 | | } |
| 4826 | | |
| 4827 | | pub fn ptraceDetach(self: *MachO, pid: std.os.pid_t) !void { |
| 4828 | | if (!is_hot_update_compatible) return; |
| 4829 | | |
| 4830 | | _ = pid; |
| 4831 | | |
| 4832 | | // TODO stop exception handler |
| 4833 | | |
| 4834 | | // TODO see comment in ptraceAttach |
| 4835 | | // try std.os.ptrace(std.os.darwin.PT.DETACH, pid, 0, 0); |
| 4836 | | |
| 4837 | | self.hot_state.mach_task = null; |
| 4838 | | } |
| 4839 | | |
| 4840 | | pub fn addUndefined(self: *MachO, name: []const u8, flags: RelocFlags) !u32 { |
| 4841 | | const gpa = self.base.comp.gpa; |
| 4842 | | |
| 4843 | | const gop = try self.getOrPutGlobalPtr(name); |
| 4844 | | const global_index = self.getGlobalIndex(name).?; |
| 4845 | | |
| 4846 | | if (gop.found_existing) { |
| 4847 | | try self.updateRelocActions(global_index, flags); |
| 4848 | | return global_index; |
| 4849 | | } |
| 4850 | | |
| 4851 | | const sym_index = try self.allocateSymbol(); |
| 4852 | | const sym_loc = SymbolWithLoc{ .sym_index = sym_index }; |
| 4853 | | gop.value_ptr.* = sym_loc; |
| 4854 | | |
| 4855 | | const sym = self.getSymbolPtr(sym_loc); |
| 4856 | | sym.n_strx = try self.strtab.insert(gpa, name); |
| 4857 | | sym.n_type = macho.N_EXT | macho.N_UNDF; |
| 4858 | | |
| 4859 | | try self.unresolved.putNoClobber(gpa, global_index, {}); |
| 4860 | | try self.updateRelocActions(global_index, flags); |
| 4861 | | |
| 4862 | | return global_index; |
| 4863 | | } |
| 4864 | | |
| 4865 | | fn updateRelocActions(self: *MachO, global_index: u32, flags: RelocFlags) !void { |
| 4866 | | const gpa = self.base.comp.gpa; |
| 4867 | | const act_gop = try self.actions.getOrPut(gpa, global_index); |
| 4868 | | if (!act_gop.found_existing) { |
| 4869 | | act_gop.value_ptr.* = .{}; |
| 4870 | | } |
| 4871 | | act_gop.value_ptr.add_got = act_gop.value_ptr.add_got or flags.add_got; |
| 4872 | | act_gop.value_ptr.add_stub = act_gop.value_ptr.add_stub or flags.add_stub; |
| 4873 | | } |
| 4874 | | |
| 4875 | | pub fn makeStaticString(bytes: []const u8) [16]u8 { |
| 4876 | | var buf = [_]u8{0} ** 16; |
| 4877 | | @memcpy(buf[0..bytes.len], bytes); |
| 4878 | | return buf; |
| 4879 | | } |
| 4880 | | |
| 4881 | | pub fn getSegmentByName(self: MachO, segname: []const u8) ?u8 { |
| 4882 | | for (self.segments.items, 0..) |seg, i| { |
| 4883 | | if (mem.eql(u8, segname, seg.segName())) return @as(u8, @intCast(i)); |
| 4884 | | } else return null; |
| 4885 | | } |
| 4886 | | |
| 4887 | | pub fn getSegment(self: MachO, sect_id: u8) macho.segment_command_64 { |
| 4888 | | const index = self.sections.items(.segment_index)[sect_id]; |
| 4889 | | return self.segments.items[index]; |
| 4890 | | } |
| 4891 | | |
| 4892 | | pub fn getSegmentPtr(self: *MachO, sect_id: u8) *macho.segment_command_64 { |
| 4893 | | const index = self.sections.items(.segment_index)[sect_id]; |
| 4894 | | return &self.segments.items[index]; |
| 4895 | | } |
| 4896 | | |
| 4897 | | pub fn getLinkeditSegmentPtr(self: *MachO) *macho.segment_command_64 { |
| 4898 | | const index = self.linkedit_segment_cmd_index.?; |
| 4899 | | return &self.segments.items[index]; |
| 4900 | | } |
| 4901 | | |
| 4902 | | pub fn getSectionByName(self: MachO, segname: []const u8, sectname: []const u8) ?u8 { |
| 4903 | | // TODO investigate caching with a hashmap |
| 4904 | | for (self.sections.items(.header), 0..) |header, i| { |
| 4905 | | if (mem.eql(u8, header.segName(), segname) and mem.eql(u8, header.sectName(), sectname)) |
| 4906 | | return @as(u8, @intCast(i)); |
| 4907 | | } else return null; |
| 4908 | | } |
| 4909 | | |
| 4910 | | pub fn getSectionIndexes(self: MachO, segment_index: u8) struct { start: u8, end: u8 } { |
| 4911 | | var start: u8 = 0; |
| 4912 | | const nsects = for (self.segments.items, 0..) |seg, i| { |
| 4913 | | if (i == segment_index) break @as(u8, @intCast(seg.nsects)); |
| 4914 | | start += @as(u8, @intCast(seg.nsects)); |
| 4915 | | } else 0; |
| 4916 | | return .{ .start = start, .end = start + nsects }; |
| 4917 | | } |
| 4918 | | |
| 4919 | | pub fn symbolIsTemp(self: *MachO, sym_with_loc: SymbolWithLoc) bool { |
| 4920 | | const sym = self.getSymbol(sym_with_loc); |
| 4921 | | if (!sym.sect()) return false; |
| 4922 | | if (sym.ext()) return false; |
| 4923 | | const sym_name = self.getSymbolName(sym_with_loc); |
| 4924 | | return mem.startsWith(u8, sym_name, "l") or mem.startsWith(u8, sym_name, "L"); |
| 4925 | | } |
| 4926 | | |
| 4927 | | /// Returns pointer-to-symbol described by `sym_with_loc` descriptor. |
| 4928 | | pub fn getSymbolPtr(self: *MachO, sym_with_loc: SymbolWithLoc) *macho.nlist_64 { |
| 4929 | | if (sym_with_loc.getFile()) |file| { |
| 4930 | | const object = &self.objects.items[file]; |
| 4931 | | return &object.symtab[sym_with_loc.sym_index]; |
| 4932 | | } else { |
| 4933 | | return &self.locals.items[sym_with_loc.sym_index]; |
| 4934 | | } |
| 4935 | | } |
| 4936 | | |
| 4937 | | /// Returns symbol described by `sym_with_loc` descriptor. |
| 4938 | | pub fn getSymbol(self: *const MachO, sym_with_loc: SymbolWithLoc) macho.nlist_64 { |
| 4939 | | if (sym_with_loc.getFile()) |file| { |
| 4940 | | const object = &self.objects.items[file]; |
| 4941 | | return object.symtab[sym_with_loc.sym_index]; |
| 4942 | | } else { |
| 4943 | | return self.locals.items[sym_with_loc.sym_index]; |
| 4944 | | } |
| 4945 | | } |
| 522 | fn lowerConst( |
| 523 | self: *MachO, |
| 524 | name: []const u8, |
| 525 | tv: TypedValue, |
| 526 | required_alignment: InternPool.Alignment, |
| 527 | sect_id: u8, |
| 528 | src_loc: Module.SrcLoc, |
| 529 | ) !LowerConstResult { |
| 530 | _ = self; |
| 531 | _ = name; |
| 532 | _ = tv; |
| 533 | _ = required_alignment; |
| 534 | _ = sect_id; |
| 535 | _ = src_loc; |
| 4946 | 536 | |
| 4947 | | /// Returns name of the symbol described by `sym_with_loc` descriptor. |
| 4948 | | pub fn getSymbolName(self: *const MachO, sym_with_loc: SymbolWithLoc) []const u8 { |
| 4949 | | if (sym_with_loc.getFile()) |file| { |
| 4950 | | const object = self.objects.items[file]; |
| 4951 | | return object.getSymbolName(sym_with_loc.sym_index); |
| 4952 | | } else { |
| 4953 | | const sym = self.locals.items[sym_with_loc.sym_index]; |
| 4954 | | return self.strtab.get(sym.n_strx).?; |
| 4955 | | } |
| 537 | @panic("TODO lowerConst"); |
| 4956 | 538 | } |
| 4957 | 539 | |
| 4958 | | const BoundarySymbolKind = enum { |
| 4959 | | start, |
| 4960 | | stop, |
| 4961 | | }; |
| 4962 | | |
| 4963 | | const SectionBoundarySymbol = struct { |
| 4964 | | kind: BoundarySymbolKind, |
| 4965 | | segname: []const u8, |
| 4966 | | sectname: []const u8, |
| 4967 | | }; |
| 4968 | | |
| 4969 | | pub fn getSectionBoundarySymbol(self: *const MachO, sym_with_loc: SymbolWithLoc) ?SectionBoundarySymbol { |
| 4970 | | const sym_name = self.getSymbolName(sym_with_loc); |
| 4971 | | if (mem.startsWith(u8, sym_name, "section$")) { |
| 4972 | | const trailing = sym_name["section$".len..]; |
| 4973 | | const kind: BoundarySymbolKind = kind: { |
| 4974 | | if (mem.startsWith(u8, trailing, "start$")) break :kind .start; |
| 4975 | | if (mem.startsWith(u8, trailing, "stop$")) break :kind .stop; |
| 4976 | | return null; |
| 4977 | | }; |
| 4978 | | const names = trailing[@tagName(kind).len + 1 ..]; |
| 4979 | | const sep_idx = mem.indexOf(u8, names, "$") orelse return null; |
| 4980 | | const segname = names[0..sep_idx]; |
| 4981 | | const sectname = names[sep_idx + 1 ..]; |
| 4982 | | return .{ .kind = kind, .segname = segname, .sectname = sectname }; |
| 540 | pub fn updateDecl(self: *MachO, mod: *Module, decl_index: InternPool.DeclIndex) !void { |
| 541 | if (build_options.skip_non_native and builtin.object_format != .macho) { |
| 542 | @panic("Attempted to compile for object format that was disabled by build configuration"); |
| 4983 | 543 | } |
| 4984 | | return null; |
| 4985 | | } |
| 544 | if (self.llvm_object) |llvm_object| return llvm_object.updateDecl(mod, decl_index); |
| 4986 | 545 | |
| 4987 | | const SegmentBoundarySymbol = struct { |
| 4988 | | kind: BoundarySymbolKind, |
| 4989 | | segname: []const u8, |
| 4990 | | }; |
| 546 | const tracy = trace(@src()); |
| 547 | defer tracy.end(); |
| 4991 | 548 | |
| 4992 | | pub fn getSegmentBoundarySymbol(self: *const MachO, sym_with_loc: SymbolWithLoc) ?SegmentBoundarySymbol { |
| 4993 | | const sym_name = self.getSymbolName(sym_with_loc); |
| 4994 | | if (mem.startsWith(u8, sym_name, "segment$")) { |
| 4995 | | const trailing = sym_name["segment$".len..]; |
| 4996 | | const kind: BoundarySymbolKind = kind: { |
| 4997 | | if (mem.startsWith(u8, trailing, "start$")) break :kind .start; |
| 4998 | | if (mem.startsWith(u8, trailing, "stop$")) break :kind .stop; |
| 4999 | | return null; |
| 5000 | | }; |
| 5001 | | const segname = trailing[@tagName(kind).len + 1 ..]; |
| 5002 | | return .{ .kind = kind, .segname = segname }; |
| 5003 | | } |
| 5004 | | return null; |
| 549 | @panic("TODO updateDecl"); |
| 5005 | 550 | } |
| 5006 | 551 | |
| 5007 | | /// Returns pointer to the global entry for `name` if one exists. |
| 5008 | | pub fn getGlobalPtr(self: *MachO, name: []const u8) ?*SymbolWithLoc { |
| 5009 | | const global_index = self.resolver.get(name) orelse return null; |
| 5010 | | return &self.globals.items[global_index]; |
| 552 | fn updateLazySymbolAtom( |
| 553 | self: *MachO, |
| 554 | sym: File.LazySymbol, |
| 555 | atom_index: Atom.Index, |
| 556 | section_index: u8, |
| 557 | ) !void { |
| 558 | _ = self; |
| 559 | _ = sym; |
| 560 | _ = atom_index; |
| 561 | _ = section_index; |
| 562 | @panic("TODO updateLazySymbolAtom"); |
| 5011 | 563 | } |
| 5012 | 564 | |
| 5013 | | /// Returns the global entry for `name` if one exists. |
| 5014 | | pub fn getGlobal(self: *const MachO, name: []const u8) ?SymbolWithLoc { |
| 5015 | | const global_index = self.resolver.get(name) orelse return null; |
| 5016 | | return self.globals.items[global_index]; |
| 565 | pub fn getOrCreateAtomForLazySymbol(self: *MachO, sym: File.LazySymbol) !Atom.Index { |
| 566 | _ = self; |
| 567 | _ = sym; |
| 568 | @panic("TODO getOrCreateAtomForLazySymbol"); |
| 5017 | 569 | } |
| 5018 | 570 | |
| 5019 | | /// Returns the index of the global entry for `name` if one exists. |
| 5020 | | pub fn getGlobalIndex(self: *const MachO, name: []const u8) ?u32 { |
| 5021 | | return self.resolver.get(name); |
| 571 | pub fn getOrCreateAtomForDecl(self: *MachO, decl_index: InternPool.DeclIndex) !Atom.Index { |
| 572 | _ = self; |
| 573 | _ = decl_index; |
| 574 | @panic("TODO getOrCreateAtomForDecl"); |
| 5022 | 575 | } |
| 5023 | 576 | |
| 5024 | | /// Returns global entry at `index`. |
| 5025 | | pub fn getGlobalByIndex(self: *const MachO, index: u32) SymbolWithLoc { |
| 5026 | | assert(index < self.globals.items.len); |
| 5027 | | return self.globals.items[index]; |
| 577 | fn getDeclOutputSection(self: *MachO, decl_index: InternPool.DeclIndex) u8 { |
| 578 | _ = self; |
| 579 | _ = decl_index; |
| 580 | @panic("TODO getDeclOutputSection"); |
| 5028 | 581 | } |
| 5029 | 582 | |
| 5030 | | const GetOrPutGlobalPtrResult = struct { |
| 5031 | | found_existing: bool, |
| 5032 | | value_ptr: *SymbolWithLoc, |
| 5033 | | }; |
| 583 | fn updateDeclCode(self: *MachO, decl_index: InternPool.DeclIndex, code: []u8) !u64 { |
| 584 | _ = self; |
| 585 | _ = decl_index; |
| 586 | _ = code; |
| 587 | @panic("TODO updateDeclCode"); |
| 588 | } |
| 5034 | 589 | |
| 5035 | | /// Used only for disambiguating local from global at relocation level. |
| 5036 | | /// TODO this must go away. |
| 5037 | | pub const global_symbol_bit: u32 = 0x80000000; |
| 5038 | | pub const global_symbol_mask: u32 = 0x7fffffff; |
| 5039 | | |
| 5040 | | /// Return pointer to the global entry for `name` if one exists. |
| 5041 | | /// Puts a new global entry for `name` if one doesn't exist, and |
| 5042 | | /// returns a pointer to it. |
| 5043 | | pub fn getOrPutGlobalPtr(self: *MachO, name: []const u8) !GetOrPutGlobalPtrResult { |
| 5044 | | if (self.getGlobalPtr(name)) |ptr| { |
| 5045 | | return GetOrPutGlobalPtrResult{ .found_existing = true, .value_ptr = ptr }; |
| 590 | pub fn updateDeclLineNumber(self: *MachO, module: *Module, decl_index: InternPool.DeclIndex) !void { |
| 591 | if (self.d_sym) |*d_sym| { |
| 592 | try d_sym.dwarf.updateDeclLineNumber(module, decl_index); |
| 5046 | 593 | } |
| 5047 | | const gpa = self.base.comp.gpa; |
| 5048 | | const global_index = try self.allocateGlobal(); |
| 5049 | | const global_name = try gpa.dupe(u8, name); |
| 5050 | | _ = try self.resolver.put(gpa, global_name, global_index); |
| 5051 | | const ptr = &self.globals.items[global_index]; |
| 5052 | | return GetOrPutGlobalPtrResult{ .found_existing = false, .value_ptr = ptr }; |
| 5053 | 594 | } |
| 5054 | 595 | |
| 5055 | | pub fn getAtom(self: *MachO, atom_index: Atom.Index) Atom { |
| 5056 | | assert(atom_index < self.atoms.items.len); |
| 5057 | | return self.atoms.items[atom_index]; |
| 596 | pub fn updateExports( |
| 597 | self: *MachO, |
| 598 | mod: *Module, |
| 599 | exported: Module.Exported, |
| 600 | exports: []const *Module.Export, |
| 601 | ) File.UpdateExportsError!void { |
| 602 | if (build_options.skip_non_native and builtin.object_format != .macho) { |
| 603 | @panic("Attempted to compile for object format that was disabled by build configuration"); |
| 604 | } |
| 605 | if (self.llvm_object) |llvm_object| |
| 606 | return llvm_object.updateExports(mod, exported, exports); |
| 607 | |
| 608 | @panic("TODO updateExports"); |
| 5058 | 609 | } |
| 5059 | 610 | |
| 5060 | | pub fn getAtomPtr(self: *MachO, atom_index: Atom.Index) *Atom { |
| 5061 | | assert(atom_index < self.atoms.items.len); |
| 5062 | | return &self.atoms.items[atom_index]; |
| 611 | pub fn deleteDeclExport( |
| 612 | self: *MachO, |
| 613 | decl_index: InternPool.DeclIndex, |
| 614 | name: InternPool.NullTerminatedString, |
| 615 | ) Allocator.Error!void { |
| 616 | if (self.llvm_object) |_| return; |
| 617 | _ = decl_index; |
| 618 | _ = name; |
| 619 | @panic("TODO deleteDeclExport"); |
| 5063 | 620 | } |
| 5064 | 621 | |
| 5065 | | /// Returns atom if there is an atom referenced by the symbol described by `sym_with_loc` descriptor. |
| 5066 | | /// Returns null on failure. |
| 5067 | | pub fn getAtomIndexForSymbol(self: *MachO, sym_with_loc: SymbolWithLoc) ?Atom.Index { |
| 5068 | | assert(sym_with_loc.getFile() == null); |
| 5069 | | return self.atom_by_index_table.get(sym_with_loc.sym_index); |
| 622 | fn freeUnnamedConsts(self: *MachO, decl_index: InternPool.DeclIndex) void { |
| 623 | _ = self; |
| 624 | _ = decl_index; |
| 625 | @panic("TODO freeUnnamedConst"); |
| 5070 | 626 | } |
| 5071 | 627 | |
| 5072 | | pub fn getGotEntryAddress(self: *MachO, sym_with_loc: SymbolWithLoc) ?u64 { |
| 5073 | | const index = self.got_table.lookup.get(sym_with_loc) orelse return null; |
| 5074 | | const header = self.sections.items(.header)[self.got_section_index.?]; |
| 5075 | | return header.addr + @sizeOf(u64) * index; |
| 628 | pub fn freeDecl(self: *MachO, decl_index: InternPool.DeclIndex) void { |
| 629 | if (self.llvm_object) |llvm_object| return llvm_object.freeDecl(decl_index); |
| 630 | @panic("TODO freeDecl"); |
| 5076 | 631 | } |
| 5077 | 632 | |
| 5078 | | pub fn getTlvPtrEntryAddress(self: *MachO, sym_with_loc: SymbolWithLoc) ?u64 { |
| 5079 | | const index = self.tlv_ptr_table.lookup.get(sym_with_loc) orelse return null; |
| 5080 | | const header = self.sections.items(.header)[self.tlv_ptr_section_index.?]; |
| 5081 | | return header.addr + @sizeOf(u64) * index; |
| 633 | pub fn getDeclVAddr(self: *MachO, decl_index: InternPool.DeclIndex, reloc_info: File.RelocInfo) !u64 { |
| 634 | assert(self.llvm_object == null); |
| 635 | _ = decl_index; |
| 636 | _ = reloc_info; |
| 637 | @panic("TODO getDeclVAddr"); |
| 5082 | 638 | } |
| 5083 | 639 | |
| 5084 | | pub fn getStubsEntryAddress(self: *MachO, sym_with_loc: SymbolWithLoc) ?u64 { |
| 5085 | | const target = self.base.comp.root_mod.resolved_target.result; |
| 5086 | | const index = self.stub_table.lookup.get(sym_with_loc) orelse return null; |
| 5087 | | const header = self.sections.items(.header)[self.stubs_section_index.?]; |
| 5088 | | return header.addr + stubs.stubSize(target.cpu.arch) * index; |
| 640 | pub fn lowerAnonDecl( |
| 641 | self: *MachO, |
| 642 | decl_val: InternPool.Index, |
| 643 | explicit_alignment: InternPool.Alignment, |
| 644 | src_loc: Module.SrcLoc, |
| 645 | ) !codegen.Result { |
| 646 | _ = self; |
| 647 | _ = decl_val; |
| 648 | _ = explicit_alignment; |
| 649 | _ = src_loc; |
| 650 | @panic("TODO lowerAnonDecl"); |
| 5089 | 651 | } |
| 5090 | 652 | |
| 5091 | | /// Returns symbol location corresponding to the set entrypoint if any. |
| 5092 | | /// Asserts output mode is executable. |
| 5093 | | pub fn getEntryPoint(self: MachO) ?SymbolWithLoc { |
| 5094 | | const entry_name = self.entry_name orelse return null; |
| 5095 | | const global = self.getGlobal(entry_name) orelse return null; |
| 5096 | | return global; |
| 653 | pub fn getAnonDeclVAddr(self: *MachO, decl_val: InternPool.Index, reloc_info: link.File.RelocInfo) !u64 { |
| 654 | assert(self.llvm_object == null); |
| 655 | _ = decl_val; |
| 656 | _ = reloc_info; |
| 657 | @panic("TODO getAnonDeclVAddr"); |
| 5097 | 658 | } |
| 5098 | 659 | |
| 5099 | | pub fn getDebugSymbols(self: *MachO) ?*DebugSymbols { |
| 5100 | | if (self.d_sym == null) return null; |
| 5101 | | return &self.d_sym.?; |
| 660 | pub fn getGlobalSymbol(self: *MachO, name: []const u8, lib_name: ?[]const u8) !u32 { |
| 661 | _ = self; |
| 662 | _ = name; |
| 663 | _ = lib_name; |
| 664 | @panic("TODO getGlobalSymbol"); |
| 5102 | 665 | } |
| 5103 | 666 | |
| 5104 | | pub inline fn getPageSize(cpu_arch: std.Target.Cpu.Arch) u16 { |
| 5105 | | return switch (cpu_arch) { |
| 5106 | | .aarch64 => 0x4000, |
| 5107 | | .x86_64 => 0x1000, |
| 5108 | | else => unreachable, |
| 5109 | | }; |
| 667 | pub fn padToIdeal(actual_size: anytype) @TypeOf(actual_size) { |
| 668 | return actual_size +| (actual_size / ideal_factor); |
| 5110 | 669 | } |
| 5111 | 670 | |
| 5112 | | pub fn requiresCodeSignature(m: *MachO) bool { |
| 5113 | | if (m.entitlements) |_| return true; |
| 5114 | | const comp = m.base.comp; |
| 5115 | | const target = comp.root_mod.resolved_target.result; |
| 5116 | | const cpu_arch = target.cpu.arch; |
| 5117 | | const os_tag = target.os.tag; |
| 5118 | | const abi = target.abi; |
| 5119 | | if (cpu_arch == .aarch64 and (os_tag == .macos or abi == .simulator)) return true; |
| 5120 | | return false; |
| 671 | fn detectAllocCollision(self: *MachO, start: u64, size: u64) ?u64 { |
| 672 | // TODO: header and load commands have to be part of the __TEXT segment |
| 673 | const header_size = self.segments.items[self.header_segment_cmd_index.?].filesize; |
| 674 | if (start < header_size) |
| 675 | return header_size; |
| 676 | |
| 677 | const end = start + padToIdeal(size); |
| 678 | |
| 679 | for (self.sections.items(.header)) |header| { |
| 680 | const tight_size = header.size; |
| 681 | const increased_size = padToIdeal(tight_size); |
| 682 | const test_end = header.offset + increased_size; |
| 683 | if (end > header.offset and start < test_end) { |
| 684 | return test_end; |
| 685 | } |
| 686 | } |
| 687 | |
| 688 | return null; |
| 5121 | 689 | } |
| 5122 | 690 | |
| 5123 | | pub fn getSegmentPrecedence(segname: []const u8) u4 { |
| 5124 | | if (mem.eql(u8, segname, "__PAGEZERO")) return 0x0; |
| 5125 | | if (mem.eql(u8, segname, "__TEXT")) return 0x1; |
| 5126 | | if (mem.eql(u8, segname, "__DATA_CONST")) return 0x2; |
| 5127 | | if (mem.eql(u8, segname, "__DATA")) return 0x3; |
| 5128 | | if (mem.eql(u8, segname, "__LINKEDIT")) return 0x5; |
| 5129 | | return 0x4; |
| 691 | fn allocatedSize(self: *MachO, start: u64) u64 { |
| 692 | if (start == 0) |
| 693 | return 0; |
| 694 | var min_pos: u64 = std.math.maxInt(u64); |
| 695 | for (self.sections.items(.header)) |header| { |
| 696 | if (header.offset <= start) continue; |
| 697 | if (header.offset < min_pos) min_pos = header.offset; |
| 698 | } |
| 699 | return min_pos - start; |
| 5130 | 700 | } |
| 5131 | 701 | |
| 5132 | | pub fn getSegmentMemoryProtection(segname: []const u8) macho.vm_prot_t { |
| 5133 | | if (mem.eql(u8, segname, "__PAGEZERO")) return macho.PROT.NONE; |
| 5134 | | if (mem.eql(u8, segname, "__TEXT")) return macho.PROT.READ | macho.PROT.EXEC; |
| 5135 | | if (mem.eql(u8, segname, "__LINKEDIT")) return macho.PROT.READ; |
| 5136 | | return macho.PROT.READ | macho.PROT.WRITE; |
| 702 | fn findFreeSpace(self: *MachO, object_size: u64, min_alignment: u32) u64 { |
| 703 | var start: u64 = 0; |
| 704 | while (self.detectAllocCollision(start, object_size)) |item_end| { |
| 705 | start = mem.alignForward(u64, item_end, min_alignment); |
| 706 | } |
| 707 | return start; |
| 5137 | 708 | } |
| 5138 | 709 | |
| 5139 | | pub fn getSectionPrecedence(header: macho.section_64) u8 { |
| 5140 | | const segment_precedence: u4 = getSegmentPrecedence(header.segName()); |
| 5141 | | const section_precedence: u4 = blk: { |
| 5142 | | if (header.isCode()) { |
| 5143 | | if (mem.eql(u8, "__text", header.sectName())) break :blk 0x0; |
| 5144 | | if (header.type() == macho.S_SYMBOL_STUBS) break :blk 0x1; |
| 5145 | | break :blk 0x2; |
| 5146 | | } |
| 5147 | | switch (header.type()) { |
| 5148 | | macho.S_NON_LAZY_SYMBOL_POINTERS, |
| 5149 | | macho.S_LAZY_SYMBOL_POINTERS, |
| 5150 | | => break :blk 0x0, |
| 5151 | | macho.S_MOD_INIT_FUNC_POINTERS => break :blk 0x1, |
| 5152 | | macho.S_MOD_TERM_FUNC_POINTERS => break :blk 0x2, |
| 5153 | | macho.S_ZEROFILL => break :blk 0xf, |
| 5154 | | macho.S_THREAD_LOCAL_REGULAR => break :blk 0xd, |
| 5155 | | macho.S_THREAD_LOCAL_ZEROFILL => break :blk 0xe, |
| 5156 | | else => { |
| 5157 | | if (mem.eql(u8, "__unwind_info", header.sectName())) break :blk 0xe; |
| 5158 | | if (mem.eql(u8, "__eh_frame", header.sectName())) break :blk 0xf; |
| 5159 | | break :blk 0x3; |
| 5160 | | }, |
| 5161 | | } |
| 5162 | | }; |
| 5163 | | return (@as(u8, @intCast(segment_precedence)) << 4) + section_precedence; |
| 710 | pub fn makeStaticString(bytes: []const u8) [16]u8 { |
| 711 | var buf = [_]u8{0} ** 16; |
| 712 | @memcpy(buf[0..bytes.len], bytes); |
| 713 | return buf; |
| 5164 | 714 | } |
| 5165 | 715 | |
| 5166 | 716 | pub const ParseErrorCtx = struct { |
| ... | ... | @@ -5354,308 +904,105 @@ pub fn reportUndefined(self: *MachO) error{OutOfMemory}!void { |
| 5354 | 904 | } |
| 5355 | 905 | } |
| 5356 | 906 | |
| 5357 | | fn reportSymbolCollision( |
| 5358 | | self: *MachO, |
| 5359 | | first: SymbolWithLoc, |
| 5360 | | other: SymbolWithLoc, |
| 5361 | | ) error{OutOfMemory}!void { |
| 5362 | | const comp = self.base.comp; |
| 5363 | | const gpa = comp.gpa; |
| 5364 | | try comp.link_errors.ensureUnusedCapacity(gpa, 1); |
| 5365 | | |
| 5366 | | var notes = try std.ArrayList(File.ErrorMsg).initCapacity(gpa, 2); |
| 5367 | | defer notes.deinit(); |
| 5368 | | |
| 5369 | | if (first.getFile()) |file| { |
| 5370 | | const note = try std.fmt.allocPrint(gpa, "first definition in {s}", .{ |
| 5371 | | self.objects.items[file].name, |
| 5372 | | }); |
| 5373 | | notes.appendAssumeCapacity(.{ .msg = note }); |
| 5374 | | } |
| 5375 | | if (other.getFile()) |file| { |
| 5376 | | const note = try std.fmt.allocPrint(gpa, "next definition in {s}", .{ |
| 5377 | | self.objects.items[file].name, |
| 5378 | | }); |
| 5379 | | notes.appendAssumeCapacity(.{ .msg = note }); |
| 5380 | | } |
| 5381 | | |
| 5382 | | var err_msg = File.ErrorMsg{ .msg = try std.fmt.allocPrint(gpa, "symbol {s} defined multiple times", .{ |
| 5383 | | self.getSymbolName(first), |
| 5384 | | }) }; |
| 5385 | | err_msg.notes = try notes.toOwnedSlice(); |
| 5386 | | |
| 5387 | | comp.link_errors.appendAssumeCapacity(err_msg); |
| 5388 | | } |
| 5389 | | |
| 5390 | | fn reportUnhandledSymbolType(self: *MachO, sym_with_loc: SymbolWithLoc) error{OutOfMemory}!void { |
| 5391 | | const comp = self.base.comp; |
| 5392 | | const gpa = comp.gpa; |
| 5393 | | try comp.link_errors.ensureUnusedCapacity(gpa, 1); |
| 5394 | | |
| 5395 | | const notes = try gpa.alloc(File.ErrorMsg, 1); |
| 5396 | | errdefer gpa.free(notes); |
| 5397 | | |
| 5398 | | const file = sym_with_loc.getFile().?; |
| 5399 | | notes[0] = .{ .msg = try std.fmt.allocPrint(gpa, "defined in {s}", .{self.objects.items[file].name}) }; |
| 907 | // fn reportSymbolCollision( |
| 908 | // self: *MachO, |
| 909 | // first: SymbolWithLoc, |
| 910 | // other: SymbolWithLoc, |
| 911 | // ) error{OutOfMemory}!void { |
| 912 | // const comp = self.base.comp; |
| 913 | // const gpa = comp.gpa; |
| 914 | // try comp.link_errors.ensureUnusedCapacity(gpa, 1); |
| 915 | |
| 916 | // var notes = try std.ArrayList(File.ErrorMsg).initCapacity(gpa, 2); |
| 917 | // defer notes.deinit(); |
| 918 | |
| 919 | // if (first.getFile()) |file| { |
| 920 | // const note = try std.fmt.allocPrint(gpa, "first definition in {s}", .{ |
| 921 | // self.objects.items[file].name, |
| 922 | // }); |
| 923 | // notes.appendAssumeCapacity(.{ .msg = note }); |
| 924 | // } |
| 925 | // if (other.getFile()) |file| { |
| 926 | // const note = try std.fmt.allocPrint(gpa, "next definition in {s}", .{ |
| 927 | // self.objects.items[file].name, |
| 928 | // }); |
| 929 | // notes.appendAssumeCapacity(.{ .msg = note }); |
| 930 | // } |
| 931 | |
| 932 | // var err_msg = File.ErrorMsg{ .msg = try std.fmt.allocPrint(gpa, "symbol {s} defined multiple times", .{ |
| 933 | // self.getSymbolName(first), |
| 934 | // }) }; |
| 935 | // err_msg.notes = try notes.toOwnedSlice(); |
| 936 | |
| 937 | // comp.link_errors.appendAssumeCapacity(err_msg); |
| 938 | // } |
| 939 | |
| 940 | // fn reportUnhandledSymbolType(self: *MachO, sym_with_loc: SymbolWithLoc) error{OutOfMemory}!void { |
| 941 | // const comp = self.base.comp; |
| 942 | // const gpa = comp.gpa; |
| 943 | // try comp.link_errors.ensureUnusedCapacity(gpa, 1); |
| 944 | |
| 945 | // const notes = try gpa.alloc(File.ErrorMsg, 1); |
| 946 | // errdefer gpa.free(notes); |
| 947 | |
| 948 | // const file = sym_with_loc.getFile().?; |
| 949 | // notes[0] = .{ .msg = try std.fmt.allocPrint(gpa, "defined in {s}", .{self.objects.items[file].name}) }; |
| 950 | |
| 951 | // const sym = self.getSymbol(sym_with_loc); |
| 952 | // const sym_type = if (sym.stab()) |
| 953 | // "stab" |
| 954 | // else if (sym.indr()) |
| 955 | // "indirect" |
| 956 | // else if (sym.abs()) |
| 957 | // "absolute" |
| 958 | // else |
| 959 | // unreachable; |
| 960 | |
| 961 | // comp.link_errors.appendAssumeCapacity(.{ |
| 962 | // .msg = try std.fmt.allocPrint(gpa, "unhandled symbol type: '{s}' has type {s}", .{ |
| 963 | // self.getSymbolName(sym_with_loc), |
| 964 | // sym_type, |
| 965 | // }), |
| 966 | // .notes = notes, |
| 967 | // }); |
| 968 | // } |
| 5400 | 969 | |
| 5401 | | const sym = self.getSymbol(sym_with_loc); |
| 5402 | | const sym_type = if (sym.stab()) |
| 5403 | | "stab" |
| 5404 | | else if (sym.indr()) |
| 5405 | | "indirect" |
| 5406 | | else if (sym.abs()) |
| 5407 | | "absolute" |
| 5408 | | else |
| 5409 | | unreachable; |
| 5410 | | |
| 5411 | | comp.link_errors.appendAssumeCapacity(.{ |
| 5412 | | .msg = try std.fmt.allocPrint(gpa, "unhandled symbol type: '{s}' has type {s}", .{ |
| 5413 | | self.getSymbolName(sym_with_loc), |
| 5414 | | sym_type, |
| 5415 | | }), |
| 5416 | | .notes = notes, |
| 5417 | | }); |
| 5418 | | } |
| 5419 | | |
| 5420 | | /// Binary search |
| 5421 | | pub fn bsearch(comptime T: type, haystack: []align(1) const T, predicate: anytype) usize { |
| 5422 | | if (!@hasDecl(@TypeOf(predicate), "predicate")) |
| 5423 | | @compileError("Predicate is required to define fn predicate(@This(), T) bool"); |
| 5424 | | |
| 5425 | | var min: usize = 0; |
| 5426 | | var max: usize = haystack.len; |
| 5427 | | while (min < max) { |
| 5428 | | const index = (min + max) / 2; |
| 5429 | | const curr = haystack[index]; |
| 5430 | | if (predicate.predicate(curr)) { |
| 5431 | | min = index + 1; |
| 5432 | | } else { |
| 5433 | | max = index; |
| 5434 | | } |
| 5435 | | } |
| 5436 | | return min; |
| 970 | pub fn getDebugSymbols(self: *MachO) ?*DebugSymbols { |
| 971 | if (self.d_sym) |*ds| { |
| 972 | return ds; |
| 973 | } else return null; |
| 5437 | 974 | } |
| 5438 | 975 | |
| 5439 | | /// Linear search |
| 5440 | | pub fn lsearch(comptime T: type, haystack: []align(1) const T, predicate: anytype) usize { |
| 5441 | | if (!@hasDecl(@TypeOf(predicate), "predicate")) |
| 5442 | | @compileError("Predicate is required to define fn predicate(@This(), T) bool"); |
| 5443 | | |
| 5444 | | var i: usize = 0; |
| 5445 | | while (i < haystack.len) : (i += 1) { |
| 5446 | | if (predicate.predicate(haystack[i])) break; |
| 5447 | | } |
| 5448 | | return i; |
| 5449 | | } |
| 976 | pub fn ptraceAttach(self: *MachO, pid: std.os.pid_t) !void { |
| 977 | if (!is_hot_update_compatible) return; |
| 5450 | 978 | |
| 5451 | | pub fn logSegments(self: *MachO) void { |
| 5452 | | log.debug("segments:", .{}); |
| 5453 | | for (self.segments.items, 0..) |segment, i| { |
| 5454 | | log.debug(" segment({d}): {s} @{x} ({x}), sizeof({x})", .{ |
| 5455 | | i, |
| 5456 | | segment.segName(), |
| 5457 | | segment.fileoff, |
| 5458 | | segment.vmaddr, |
| 5459 | | segment.vmsize, |
| 5460 | | }); |
| 5461 | | } |
| 5462 | | } |
| 979 | const mach_task = try std.os.darwin.machTaskForPid(pid); |
| 980 | log.debug("Mach task for pid {d}: {any}", .{ pid, mach_task }); |
| 981 | self.hot_state.mach_task = mach_task; |
| 5463 | 982 | |
| 5464 | | pub fn logSections(self: *MachO) void { |
| 5465 | | log.debug("sections:", .{}); |
| 5466 | | for (self.sections.items(.header), 0..) |header, i| { |
| 5467 | | log.debug(" sect({d}): {s},{s} @{x} ({x}), sizeof({x})", .{ |
| 5468 | | i + 1, |
| 5469 | | header.segName(), |
| 5470 | | header.sectName(), |
| 5471 | | header.offset, |
| 5472 | | header.addr, |
| 5473 | | header.size, |
| 5474 | | }); |
| 5475 | | } |
| 5476 | | } |
| 983 | // TODO start exception handler in another thread |
| 5477 | 984 | |
| 5478 | | fn logSymAttributes(sym: macho.nlist_64, buf: []u8) []const u8 { |
| 5479 | | if (sym.sect()) { |
| 5480 | | buf[0] = 's'; |
| 5481 | | } |
| 5482 | | if (sym.ext()) { |
| 5483 | | if (sym.weakDef() or sym.pext()) { |
| 5484 | | buf[1] = 'w'; |
| 5485 | | } else { |
| 5486 | | buf[1] = 'e'; |
| 5487 | | } |
| 5488 | | } |
| 5489 | | if (sym.tentative()) { |
| 5490 | | buf[2] = 't'; |
| 5491 | | } |
| 5492 | | if (sym.undf()) { |
| 5493 | | buf[3] = 'u'; |
| 5494 | | } |
| 5495 | | return buf[0..]; |
| 985 | // TODO enable ones we register for exceptions |
| 986 | // try std.os.ptrace(std.os.darwin.PT.ATTACHEXC, pid, 0, 0); |
| 5496 | 987 | } |
| 5497 | 988 | |
| 5498 | | pub fn logSymtab(self: *MachO) void { |
| 5499 | | var buf: [4]u8 = undefined; |
| 5500 | | |
| 5501 | | const scoped_log = std.log.scoped(.symtab); |
| 5502 | | |
| 5503 | | scoped_log.debug("locals:", .{}); |
| 5504 | | for (self.objects.items, 0..) |object, id| { |
| 5505 | | scoped_log.debug(" object({d}): {s}", .{ id, object.name }); |
| 5506 | | if (object.in_symtab == null) continue; |
| 5507 | | for (object.symtab, 0..) |sym, sym_id| { |
| 5508 | | @memset(&buf, '_'); |
| 5509 | | scoped_log.debug(" %{d}: {s} @{x} in sect({d}), {s}", .{ |
| 5510 | | sym_id, |
| 5511 | | object.getSymbolName(@as(u32, @intCast(sym_id))), |
| 5512 | | sym.n_value, |
| 5513 | | sym.n_sect, |
| 5514 | | logSymAttributes(sym, &buf), |
| 5515 | | }); |
| 5516 | | } |
| 5517 | | } |
| 5518 | | scoped_log.debug(" object(-1)", .{}); |
| 5519 | | for (self.locals.items, 0..) |sym, sym_id| { |
| 5520 | | if (sym.undf()) continue; |
| 5521 | | scoped_log.debug(" %{d}: {s} @{x} in sect({d}), {s}", .{ |
| 5522 | | sym_id, |
| 5523 | | self.strtab.get(sym.n_strx).?, |
| 5524 | | sym.n_value, |
| 5525 | | sym.n_sect, |
| 5526 | | logSymAttributes(sym, &buf), |
| 5527 | | }); |
| 5528 | | } |
| 5529 | | |
| 5530 | | scoped_log.debug("exports:", .{}); |
| 5531 | | for (self.globals.items, 0..) |global, i| { |
| 5532 | | const sym = self.getSymbol(global); |
| 5533 | | if (sym.undf()) continue; |
| 5534 | | if (sym.n_desc == N_DEAD) continue; |
| 5535 | | if (sym.n_desc == N_BOUNDARY) continue; |
| 5536 | | scoped_log.debug(" %{d}: {s} @{x} in sect({d}), {s} (def in object({?}))", .{ |
| 5537 | | i, |
| 5538 | | self.getSymbolName(global), |
| 5539 | | sym.n_value, |
| 5540 | | sym.n_sect, |
| 5541 | | logSymAttributes(sym, &buf), |
| 5542 | | global.file, |
| 5543 | | }); |
| 5544 | | } |
| 5545 | | |
| 5546 | | scoped_log.debug("imports:", .{}); |
| 5547 | | for (self.globals.items, 0..) |global, i| { |
| 5548 | | const sym = self.getSymbol(global); |
| 5549 | | if (!sym.undf()) continue; |
| 5550 | | if (sym.n_desc == N_DEAD) continue; |
| 5551 | | if (sym.n_desc == N_BOUNDARY) continue; |
| 5552 | | const ord = @divTrunc(sym.n_desc, macho.N_SYMBOL_RESOLVER); |
| 5553 | | scoped_log.debug(" %{d}: {s} @{x} in ord({d}), {s}", .{ |
| 5554 | | i, |
| 5555 | | self.getSymbolName(global), |
| 5556 | | sym.n_value, |
| 5557 | | ord, |
| 5558 | | logSymAttributes(sym, &buf), |
| 5559 | | }); |
| 5560 | | } |
| 5561 | | |
| 5562 | | scoped_log.debug("GOT entries:", .{}); |
| 5563 | | scoped_log.debug("{}", .{self.got_table}); |
| 5564 | | |
| 5565 | | scoped_log.debug("TLV pointers:", .{}); |
| 5566 | | scoped_log.debug("{}", .{self.tlv_ptr_table}); |
| 5567 | | |
| 5568 | | scoped_log.debug("stubs entries:", .{}); |
| 5569 | | scoped_log.debug("{}", .{self.stub_table}); |
| 5570 | | |
| 5571 | | scoped_log.debug("thunks:", .{}); |
| 5572 | | for (self.thunks.items, 0..) |thunk, i| { |
| 5573 | | scoped_log.debug(" thunk({d})", .{i}); |
| 5574 | | const slice = thunk.targets.slice(); |
| 5575 | | for (slice.items(.tag), slice.items(.target), 0..) |tag, target, j| { |
| 5576 | | const atom_index = @as(u32, @intCast(thunk.getStartAtomIndex() + j)); |
| 5577 | | const atom = self.getAtom(atom_index); |
| 5578 | | const atom_sym = self.getSymbol(atom.getSymbolWithLoc()); |
| 5579 | | const target_addr = switch (tag) { |
| 5580 | | .stub => self.getStubsEntryAddress(target).?, |
| 5581 | | .atom => self.getSymbol(target).n_value, |
| 5582 | | }; |
| 5583 | | scoped_log.debug(" {d}@{x} => {s}({s}@{x})", .{ |
| 5584 | | j, |
| 5585 | | atom_sym.n_value, |
| 5586 | | @tagName(tag), |
| 5587 | | self.getSymbolName(target), |
| 5588 | | target_addr, |
| 5589 | | }); |
| 5590 | | } |
| 5591 | | } |
| 5592 | | } |
| 989 | pub fn ptraceDetach(self: *MachO, pid: std.os.pid_t) !void { |
| 990 | if (!is_hot_update_compatible) return; |
| 5593 | 991 | |
| 5594 | | pub fn logAtoms(self: *MachO) void { |
| 5595 | | log.debug("atoms:", .{}); |
| 5596 | | const slice = self.sections.slice(); |
| 5597 | | for (slice.items(.first_atom_index), 0..) |first_atom_index, sect_id| { |
| 5598 | | var atom_index = first_atom_index orelse continue; |
| 5599 | | const header = slice.items(.header)[sect_id]; |
| 992 | _ = pid; |
| 5600 | 993 | |
| 5601 | | log.debug("{s},{s}", .{ header.segName(), header.sectName() }); |
| 994 | // TODO stop exception handler |
| 5602 | 995 | |
| 5603 | | while (true) { |
| 5604 | | const atom = self.getAtom(atom_index); |
| 5605 | | self.logAtom(atom_index, log); |
| 996 | // TODO see comment in ptraceAttach |
| 997 | // try std.os.ptrace(std.os.darwin.PT.DETACH, pid, 0, 0); |
| 5606 | 998 | |
| 5607 | | if (atom.next_index) |next_index| { |
| 5608 | | atom_index = next_index; |
| 5609 | | } else break; |
| 5610 | | } |
| 5611 | | } |
| 999 | self.hot_state.mach_task = null; |
| 5612 | 1000 | } |
| 5613 | 1001 | |
| 5614 | | pub fn logAtom(self: *MachO, atom_index: Atom.Index, logger: anytype) void { |
| 5615 | | if (!build_options.enable_logging) return; |
| 5616 | | |
| 5617 | | const atom = self.getAtom(atom_index); |
| 5618 | | const sym = self.getSymbol(atom.getSymbolWithLoc()); |
| 5619 | | const sym_name = self.getSymbolName(atom.getSymbolWithLoc()); |
| 5620 | | logger.debug(" ATOM({d}, %{d}, '{s}') @ {x} (sizeof({x}), alignof({x})) in object({?}) in sect({d})", .{ |
| 5621 | | atom_index, |
| 5622 | | atom.sym_index, |
| 5623 | | sym_name, |
| 5624 | | sym.n_value, |
| 5625 | | atom.size, |
| 5626 | | atom.alignment, |
| 5627 | | atom.getFile(), |
| 5628 | | sym.n_sect, |
| 5629 | | }); |
| 5630 | | |
| 5631 | | if (atom.getFile() != null) { |
| 5632 | | var it = Atom.getInnerSymbolsIterator(self, atom_index); |
| 5633 | | while (it.next()) |sym_loc| { |
| 5634 | | const inner = self.getSymbol(sym_loc); |
| 5635 | | const inner_name = self.getSymbolName(sym_loc); |
| 5636 | | const offset = Atom.calcInnerSymbolOffset(self, atom_index, sym_loc.sym_index); |
| 5637 | | |
| 5638 | | logger.debug(" (%{d}, '{s}') @ {x} ({x})", .{ |
| 5639 | | sym_loc.sym_index, |
| 5640 | | inner_name, |
| 5641 | | inner.n_value, |
| 5642 | | offset, |
| 5643 | | }); |
| 5644 | | } |
| 5645 | | |
| 5646 | | if (Atom.getSectionAlias(self, atom_index)) |sym_loc| { |
| 5647 | | const alias = self.getSymbol(sym_loc); |
| 5648 | | const alias_name = self.getSymbolName(sym_loc); |
| 5649 | | |
| 5650 | | logger.debug(" (%{d}, '{s}') @ {x} ({x})", .{ |
| 5651 | | sym_loc.sym_index, |
| 5652 | | alias_name, |
| 5653 | | alias.n_value, |
| 5654 | | 0, |
| 5655 | | }); |
| 5656 | | } |
| 5657 | | } |
| 5658 | | } |
| 1002 | const is_hot_update_compatible = switch (builtin.target.os.tag) { |
| 1003 | .macos => true, |
| 1004 | else => false, |
| 1005 | }; |
| 5659 | 1006 | |
| 5660 | 1007 | const default_entry_symbol_name = "_main"; |
| 5661 | 1008 | |
| ... | ... | @@ -5663,17 +1010,6 @@ pub const base_tag: File.Tag = File.Tag.macho; |
| 5663 | 1010 | pub const N_DEAD: u16 = @as(u16, @bitCast(@as(i16, -1))); |
| 5664 | 1011 | pub const N_BOUNDARY: u16 = @as(u16, @bitCast(@as(i16, -2))); |
| 5665 | 1012 | |
| 5666 | | /// Mode of operation of the linker. |
| 5667 | | pub const Mode = enum { |
| 5668 | | /// Incremental mode will preallocate segments/sections and is compatible with |
| 5669 | | /// watch and HCS modes of operation. |
| 5670 | | incremental, |
| 5671 | | /// Zld mode will link relocatables in a traditional, one-shot |
| 5672 | | /// fashion (default for LLVM backend). It acts as a drop-in replacement for |
| 5673 | | /// LLD. |
| 5674 | | zld, |
| 5675 | | }; |
| 5676 | | |
| 5677 | 1013 | pub const Section = struct { |
| 5678 | 1014 | header: macho.section_64, |
| 5679 | 1015 | segment_index: u8, |
| ... | ... | @@ -5698,11 +1034,6 @@ pub const Section = struct { |
| 5698 | 1034 | free_list: std.ArrayListUnmanaged(Atom.Index) = .{}, |
| 5699 | 1035 | }; |
| 5700 | 1036 | |
| 5701 | | const is_hot_update_compatible = switch (builtin.target.os.tag) { |
| 5702 | | .macos => true, |
| 5703 | | else => false, |
| 5704 | | }; |
| 5705 | | |
| 5706 | 1037 | const LazySymbolTable = std.AutoArrayHashMapUnmanaged(InternPool.OptionalDeclIndex, LazySymbolMetadata); |
| 5707 | 1038 | |
| 5708 | 1039 | const LazySymbolMetadata = struct { |
| ... | ... | @@ -5713,8 +1044,6 @@ const LazySymbolMetadata = struct { |
| 5713 | 1044 | data_const_state: State = .unused, |
| 5714 | 1045 | }; |
| 5715 | 1046 | |
| 5716 | | const TlvSymbolTable = std.AutoArrayHashMapUnmanaged(SymbolWithLoc, Atom.Index); |
| 5717 | | |
| 5718 | 1047 | const DeclMetadata = struct { |
| 5719 | 1048 | atom: Atom.Index, |
| 5720 | 1049 | section: u8, |
| ... | ... | @@ -5737,38 +1066,143 @@ const DeclMetadata = struct { |
| 5737 | 1066 | } |
| 5738 | 1067 | }; |
| 5739 | 1068 | |
| 5740 | | const DeclTable = std.AutoArrayHashMapUnmanaged(InternPool.DeclIndex, DeclMetadata); |
| 5741 | | const AnonDeclTable = std.AutoHashMapUnmanaged(InternPool.Index, DeclMetadata); |
| 5742 | | const BindingTable = std.AutoArrayHashMapUnmanaged(Atom.Index, std.ArrayListUnmanaged(Atom.Binding)); |
| 5743 | | const UnnamedConstTable = std.AutoArrayHashMapUnmanaged(InternPool.DeclIndex, std.ArrayListUnmanaged(Atom.Index)); |
| 5744 | | const RebaseTable = std.AutoArrayHashMapUnmanaged(Atom.Index, std.ArrayListUnmanaged(u32)); |
| 5745 | | const RelocationTable = std.AutoArrayHashMapUnmanaged(Atom.Index, std.ArrayListUnmanaged(Relocation)); |
| 5746 | | const ActionTable = std.AutoHashMapUnmanaged(u32, RelocFlags); |
| 5747 | | |
| 5748 | | pub const RelocFlags = packed struct { |
| 5749 | | add_got: bool = false, |
| 5750 | | add_stub: bool = false, |
| 1069 | const HotUpdateState = struct { |
| 1070 | mach_task: ?std.os.darwin.MachTask = null, |
| 1071 | }; |
| 1072 | |
| 1073 | pub const SymtabCtx = struct { |
| 1074 | ilocal: u32 = 0, |
| 1075 | istab: u32 = 0, |
| 1076 | iexport: u32 = 0, |
| 1077 | iimport: u32 = 0, |
| 1078 | nlocals: u32 = 0, |
| 1079 | nstabs: u32 = 0, |
| 1080 | nexports: u32 = 0, |
| 1081 | nimports: u32 = 0, |
| 1082 | strsize: u32 = 0, |
| 5751 | 1083 | }; |
| 5752 | 1084 | |
| 5753 | | pub const SymbolWithLoc = extern struct { |
| 5754 | | // Index into the respective symbol table. |
| 5755 | | sym_index: u32, |
| 1085 | pub const null_sym = macho.nlist_64{ |
| 1086 | .n_strx = 0, |
| 1087 | .n_type = 0, |
| 1088 | .n_sect = 0, |
| 1089 | .n_desc = 0, |
| 1090 | .n_value = 0, |
| 1091 | }; |
| 1092 | |
| 1093 | pub const Platform = struct { |
| 1094 | platform: macho.PLATFORM, |
| 1095 | version: Version, |
| 1096 | |
| 1097 | /// Using Apple's ld64 as our blueprint, `min_version` as well as `sdk_version` are set to |
| 1098 | /// the extracted minimum platform version. |
| 1099 | pub fn fromLoadCommand(lc: macho.LoadCommandIterator.LoadCommand) Platform { |
| 1100 | switch (lc.cmd()) { |
| 1101 | .BUILD_VERSION => { |
| 1102 | const lc_cmd = lc.cast(macho.build_version_command).?; |
| 1103 | return .{ |
| 1104 | .platform = lc_cmd.platform, |
| 1105 | .version = .{ .value = lc_cmd.minos }, |
| 1106 | }; |
| 1107 | }, |
| 1108 | .VERSION_MIN_MACOSX, |
| 1109 | .VERSION_MIN_IPHONEOS, |
| 1110 | .VERSION_MIN_TVOS, |
| 1111 | .VERSION_MIN_WATCHOS, |
| 1112 | => { |
| 1113 | const lc_cmd = lc.cast(macho.version_min_command).?; |
| 1114 | return .{ |
| 1115 | .platform = switch (lc.cmd()) { |
| 1116 | .VERSION_MIN_MACOSX => .MACOS, |
| 1117 | .VERSION_MIN_IPHONEOS => .IOS, |
| 1118 | .VERSION_MIN_TVOS => .TVOS, |
| 1119 | .VERSION_MIN_WATCHOS => .WATCHOS, |
| 1120 | else => unreachable, |
| 1121 | }, |
| 1122 | .version = .{ .value = lc_cmd.version }, |
| 1123 | }; |
| 1124 | }, |
| 1125 | else => unreachable, |
| 1126 | } |
| 1127 | } |
| 1128 | |
| 1129 | pub fn isBuildVersionCompatible(plat: Platform) bool { |
| 1130 | inline for (supported_platforms) |sup_plat| { |
| 1131 | if (sup_plat[0] == plat.platform) { |
| 1132 | return sup_plat[1] <= plat.version.value; |
| 1133 | } |
| 1134 | } |
| 1135 | return false; |
| 1136 | } |
| 1137 | }; |
| 1138 | |
| 1139 | pub const Version = struct { |
| 1140 | value: u32, |
| 1141 | |
| 1142 | pub fn major(v: Version) u16 { |
| 1143 | return @as(u16, @truncate(v.value >> 16)); |
| 1144 | } |
| 5756 | 1145 | |
| 5757 | | // 0 means it's a synthetic global. |
| 5758 | | file: u32 = 0, |
| 1146 | pub fn minor(v: Version) u8 { |
| 1147 | return @as(u8, @truncate(v.value >> 8)); |
| 1148 | } |
| 1149 | |
| 1150 | pub fn patch(v: Version) u8 { |
| 1151 | return @as(u8, @truncate(v.value)); |
| 1152 | } |
| 1153 | |
| 1154 | pub fn parse(raw: []const u8) ?Version { |
| 1155 | var parsed: [3]u16 = [_]u16{0} ** 3; |
| 1156 | var count: usize = 0; |
| 1157 | var it = std.mem.splitAny(u8, raw, "."); |
| 1158 | while (it.next()) |comp| { |
| 1159 | if (count >= 3) return null; |
| 1160 | parsed[count] = std.fmt.parseInt(u16, comp, 10) catch return null; |
| 1161 | count += 1; |
| 1162 | } |
| 1163 | if (count == 0) return null; |
| 1164 | const maj = parsed[0]; |
| 1165 | const min = std.math.cast(u8, parsed[1]) orelse return null; |
| 1166 | const pat = std.math.cast(u8, parsed[2]) orelse return null; |
| 1167 | return Version.new(maj, min, pat); |
| 1168 | } |
| 5759 | 1169 | |
| 5760 | | pub fn getFile(self: SymbolWithLoc) ?u32 { |
| 5761 | | if (self.file == 0) return null; |
| 5762 | | return self.file - 1; |
| 1170 | pub fn new(maj: u16, min: u8, pat: u8) Version { |
| 1171 | return .{ .value = (@as(u32, @intCast(maj)) << 16) | (@as(u32, @intCast(min)) << 8) | pat }; |
| 5763 | 1172 | } |
| 5764 | 1173 | |
| 5765 | | pub fn eql(self: SymbolWithLoc, other: SymbolWithLoc) bool { |
| 5766 | | return self.file == other.file and self.sym_index == other.sym_index; |
| 1174 | pub fn format( |
| 1175 | v: Version, |
| 1176 | comptime unused_fmt_string: []const u8, |
| 1177 | options: std.fmt.FormatOptions, |
| 1178 | writer: anytype, |
| 1179 | ) !void { |
| 1180 | _ = unused_fmt_string; |
| 1181 | _ = options; |
| 1182 | try writer.print("{d}.{d}.{d}", .{ |
| 1183 | v.major(), |
| 1184 | v.minor(), |
| 1185 | v.patch(), |
| 1186 | }); |
| 5767 | 1187 | } |
| 5768 | 1188 | }; |
| 5769 | 1189 | |
| 5770 | | const HotUpdateState = struct { |
| 5771 | | mach_task: ?std.os.darwin.MachTask = null, |
| 1190 | const SupportedPlatforms = struct { |
| 1191 | macho.PLATFORM, // Platform identifier |
| 1192 | u32, // Min platform version for which to emit LC_BUILD_VERSION |
| 1193 | u32, // Min supported platform version |
| 1194 | ?[]const u8, // Env var to look for |
| 1195 | }; |
| 1196 | |
| 1197 | // Source: https://github.com/apple-oss-distributions/ld64/blob/59a99ab60399c5e6c49e6945a9e1049c42b71135/src/ld/PlatformSupport.cpp#L52 |
| 1198 | const supported_platforms = [_]SupportedPlatforms{ |
| 1199 | .{ .MACOS, 0xA0E00, 0xA0800, "MACOSX_DEPLOYMENT_TARGET" }, |
| 1200 | .{ .IOS, 0xC0000, 0x70000, "IPHONEOS_DEPLOYMENT_TARGET" }, |
| 1201 | .{ .TVOS, 0xC0000, 0x70000, "TVOS_DEPLOYMENT_TARGET" }, |
| 1202 | .{ .WATCHOS, 0x50000, 0x20000, "WATCHOS_DEPLOYMENT_TARGET" }, |
| 1203 | .{ .IOSSIMULATOR, 0xD0000, 0x80000, null }, |
| 1204 | .{ .TVOSSIMULATOR, 0xD0000, 0x80000, null }, |
| 1205 | .{ .WATCHOSSIMULATOR, 0x60000, 0x20000, null }, |
| 5772 | 1206 | }; |
| 5773 | 1207 | |
| 5774 | 1208 | /// When allocating, the ideal_capacity is calculated by |
| ... | ... | @@ -5812,20 +1246,20 @@ const fat = @import("MachO/fat.zig"); |
| 5812 | 1246 | const link = @import("../link.zig"); |
| 5813 | 1247 | const llvm_backend = @import("../codegen/llvm.zig"); |
| 5814 | 1248 | const load_commands = @import("MachO/load_commands.zig"); |
| 5815 | | const stubs = @import("MachO/stubs.zig"); |
| 5816 | 1249 | const tapi = @import("tapi.zig"); |
| 5817 | 1250 | const target_util = @import("../target.zig"); |
| 5818 | 1251 | const thunks = @import("MachO/thunks.zig"); |
| 5819 | 1252 | const trace = @import("../tracy.zig").trace; |
| 5820 | | const zld = @import("MachO/zld.zig"); |
| 5821 | 1253 | |
| 5822 | 1254 | const Air = @import("../Air.zig"); |
| 1255 | const Alignment = Atom.Alignment; |
| 5823 | 1256 | const Allocator = mem.Allocator; |
| 5824 | 1257 | const Archive = @import("MachO/Archive.zig"); |
| 5825 | 1258 | pub const Atom = @import("MachO/Atom.zig"); |
| 5826 | 1259 | const Cache = std.Build.Cache; |
| 5827 | 1260 | const CodeSignature = @import("MachO/CodeSignature.zig"); |
| 5828 | 1261 | const Compilation = @import("../Compilation.zig"); |
| 1262 | pub const DebugSymbols = @import("MachO/DebugSymbols.zig"); |
| 5829 | 1263 | const Dwarf = File.Dwarf; |
| 5830 | 1264 | const DwarfInfo = @import("MachO/DwarfInfo.zig"); |
| 5831 | 1265 | const Dylib = @import("MachO/Dylib.zig"); |
| ... | ... | @@ -5837,17 +1271,9 @@ const LlvmObject = @import("../codegen/llvm.zig").Object; |
| 5837 | 1271 | const Md5 = std.crypto.hash.Md5; |
| 5838 | 1272 | const Module = @import("../Module.zig"); |
| 5839 | 1273 | const InternPool = @import("../InternPool.zig"); |
| 5840 | | const Platform = load_commands.Platform; |
| 5841 | 1274 | const Relocation = @import("MachO/Relocation.zig"); |
| 5842 | 1275 | const StringTable = @import("StringTable.zig"); |
| 5843 | 1276 | const TableSection = @import("table_section.zig").TableSection; |
| 5844 | | const Trie = @import("MachO/Trie.zig"); |
| 5845 | 1277 | const Type = @import("../type.zig").Type; |
| 5846 | 1278 | const TypedValue = @import("../TypedValue.zig"); |
| 5847 | 1279 | const Value = @import("../value.zig").Value; |
| 5848 | | const Alignment = Atom.Alignment; |
| 5849 | | |
| 5850 | | pub const DebugSymbols = @import("MachO/DebugSymbols.zig"); |
| 5851 | | pub const Bind = @import("MachO/dyld_info/bind.zig").Bind(*const MachO, SymbolWithLoc); |
| 5852 | | pub const LazyBind = @import("MachO/dyld_info/bind.zig").LazyBind(*const MachO, SymbolWithLoc); |
| 5853 | | pub const Rebase = @import("MachO/dyld_info/Rebase.zig"); |
Jakub Konka <kubkon@jakubkonka.com> 2024-01-09 19:51:01+01:00