| ... | @@ -7,8 +7,6 @@ llvm_object: ?*LlvmObject = null, | ... | @@ -7,8 +7,6 @@ llvm_object: ?*LlvmObject = null, |
| 7 | /// Debug symbols bundle (or dSym). | 7 | /// Debug symbols bundle (or dSym). |
| 8 | d_sym: ?DebugSymbols = null, | 8 | d_sym: ?DebugSymbols = null, |
| 9 | | 9 | |
| 10 | mode: Mode, | | |
| 11 | | | |
| 12 | dyld_info_cmd: macho.dyld_info_command = .{}, | 10 | dyld_info_cmd: macho.dyld_info_command = .{}, |
| 13 | symtab_cmd: macho.symtab_command = .{}, | 11 | symtab_cmd: macho.symtab_command = .{}, |
| 14 | dysymtab_cmd: macho.dysymtab_command = .{}, | 12 | dysymtab_cmd: macho.dysymtab_command = .{}, |
| ... | @@ -17,12 +15,6 @@ data_in_code_cmd: macho.linkedit_data_command = .{ .cmd = .DATA_IN_CODE }, | ... | @@ -17,12 +15,6 @@ data_in_code_cmd: macho.linkedit_data_command = .{ .cmd = .DATA_IN_CODE }, |
| 17 | uuid_cmd: macho.uuid_command = .{ .uuid = [_]u8{0} ** 16 }, | 15 | uuid_cmd: macho.uuid_command = .{ .uuid = [_]u8{0} ** 16 }, |
| 18 | codesig_cmd: macho.linkedit_data_command = .{ .cmd = .CODE_SIGNATURE }, | 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 | segments: std.ArrayListUnmanaged(macho.segment_command_64) = .{}, | 18 | segments: std.ArrayListUnmanaged(macho.segment_command_64) = .{}, |
| 27 | sections: std.MultiArrayList(Section) = .{}, | 19 | sections: std.MultiArrayList(Section) = .{}, |
| 28 | | 20 | |
| ... | @@ -48,93 +40,11 @@ got_section_index: ?u8 = null, | ... | @@ -48,93 +40,11 @@ got_section_index: ?u8 = null, |
| 48 | la_symbol_ptr_section_index: ?u8 = null, | 40 | la_symbol_ptr_section_index: ?u8 = null, |
| 49 | tlv_ptr_section_index: ?u8 = null, | 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 | strtab: StringTable = .{}, | 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 | /// List of atoms that are either synthetic or map directly to the Zig source program. | 45 | /// List of atoms that are either synthetic or map directly to the Zig source program. |
| 79 | atoms: std.ArrayListUnmanaged(Atom) = .{}, | 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 | sdk_layout: ?SdkLayout, | 48 | sdk_layout: ?SdkLayout, |
| 139 | /// Size of the __PAGEZERO segment. | 49 | /// Size of the __PAGEZERO segment. |
| 140 | pagezero_vmsize: u64, | 50 | pagezero_vmsize: u64, |
| ... | @@ -152,6 +62,9 @@ install_name: ?[]const u8, | ... | @@ -152,6 +62,9 @@ install_name: ?[]const u8, |
| 152 | entitlements: ?[]const u8, | 62 | entitlements: ?[]const u8, |
| 153 | compatibility_version: ?std.SemanticVersion, | 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 | /// When adding a new field, remember to update `hashAddFrameworks`. | 68 | /// When adding a new field, remember to update `hashAddFrameworks`. |
| 156 | pub const Framework = struct { | 69 | pub const Framework = struct { |
| 157 | needed: bool = false, | 70 | needed: bool = false, |
| ... | @@ -183,24 +96,18 @@ pub fn createEmpty( | ... | @@ -183,24 +96,18 @@ pub fn createEmpty( |
| 183 | ) !*MachO { | 96 | ) !*MachO { |
| 184 | const target = comp.root_mod.resolved_target.result; | 97 | const target = comp.root_mod.resolved_target.result; |
| 185 | assert(target.ofmt == .macho); | 98 | assert(target.ofmt == .macho); |
| 186 | const use_llvm = comp.config.use_llvm; | 99 | |
| 187 | const gpa = comp.gpa; | 100 | const gpa = comp.gpa; |
| | 101 | const use_llvm = comp.config.use_llvm; |
| | 102 | const opt_zcu = comp.module; |
| 188 | const optimize_mode = comp.root_mod.optimize_mode; | 103 | const optimize_mode = comp.root_mod.optimize_mode; |
| 189 | const output_mode = comp.config.output_mode; | 104 | const output_mode = comp.config.output_mode; |
| 190 | const link_mode = comp.config.link_mode; | 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 | // If using LLVM to generate the object file for the zig compilation unit, | 107 | // If using LLVM to generate the object file for the zig compilation unit, |
| 201 | // we need a place to put the object file so that it can be subsequently | 108 | // we need a place to put the object file so that it can be subsequently |
| 202 | // handled. | 109 | // handled. |
| 203 | const zcu_object_sub_path = if (mode != .zld and !use_llvm) | 110 | const zcu_object_sub_path = if (!use_llvm) |
| 204 | null | 111 | null |
| 205 | else | 112 | else |
| 206 | try std.fmt.allocPrint(arena, "{s}.o", .{emit.sub_path}); | 113 | try std.fmt.allocPrint(arena, "{s}.o", .{emit.sub_path}); |
| ... | @@ -221,7 +128,6 @@ pub fn createEmpty( | ... | @@ -221,7 +128,6 @@ pub fn createEmpty( |
| 221 | .build_id = options.build_id, | 128 | .build_id = options.build_id, |
| 222 | .rpath_list = options.rpath_list, | 129 | .rpath_list = options.rpath_list, |
| 223 | }, | 130 | }, |
| 224 | .mode = mode, | | |
| 225 | .pagezero_vmsize = options.pagezero_size orelse default_pagezero_vmsize, | 131 | .pagezero_vmsize = options.pagezero_size orelse default_pagezero_vmsize, |
| 226 | .headerpad_size = options.headerpad_size orelse default_headerpad_size, | 132 | .headerpad_size = options.headerpad_size orelse default_headerpad_size, |
| 227 | .headerpad_max_install_names = options.headerpad_max_install_names, | 133 | .headerpad_max_install_names = options.headerpad_max_install_names, |
| ... | @@ -243,62 +149,48 @@ pub fn createEmpty( | ... | @@ -243,62 +149,48 @@ pub fn createEmpty( |
| 243 | } | 149 | } |
| 244 | errdefer self.base.destroy(); | 150 | errdefer self.base.destroy(); |
| 245 | | 151 | |
| 246 | log.debug("selected linker mode '{s}'", .{@tagName(self.mode)}); | 152 | self.base.file = try emit.directory.handle.createFile(emit.sub_path, .{ |
| 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, .{ | | |
| 254 | .truncate = true, | 153 | .truncate = true, |
| 255 | .read = true, | 154 | .read = true, |
| 256 | .mode = link.File.determineMode(false, output_mode, link_mode), | 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) { | 158 | // Index 0 is always a null symbol. |
| 261 | // Create dSYM bundle. | 159 | // try self.locals.append(gpa, null_sym); |
| 262 | log.debug("creating {s}.dSYM bundle", .{emit.sub_path}); | 160 | try self.strtab.buffer.append(gpa, 0); |
| 263 | | 161 | |
| 264 | const d_sym_path = try std.fmt.allocPrint( | 162 | // TODO: init |
| 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 | ); | | |
| 269 | | 163 | |
| 270 | var d_sym_bundle = try emit.directory.handle.makeOpenPath(d_sym_path, .{}); | 164 | if (opt_zcu) |zcu| { |
| 271 | defer d_sym_bundle.close(); | 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, .{ | 169 | if (comp.config.debug_format != .strip) { |
| 274 | .truncate = false, | 170 | // Create dSYM bundle. |
| 275 | .read = true, | 171 | log.debug("creating {s}.dSYM bundle", .{emit.sub_path}); |
| 276 | }); | | |
| 277 | | 172 | |
| 278 | self.d_sym = .{ | 173 | const d_sym_path = try std.fmt.allocPrint( |
| 279 | .allocator = gpa, | 174 | arena, |
| 280 | .dwarf = link.File.Dwarf.init(&self.base, .dwarf32), | 175 | "{s}.dSYM" ++ fs.path.sep_str ++ "Contents" ++ fs.path.sep_str ++ "Resources" ++ fs.path.sep_str ++ "DWARF", |
| 281 | .file = d_sym_file, | 176 | .{emit.sub_path}, |
| 282 | }; | 177 | ); |
| 283 | } | | |
| 284 | | 178 | |
| 285 | // Index 0 is always a null symbol. | 179 | var d_sym_bundle = try emit.directory.handle.makeOpenPath(d_sym_path, .{}); |
| 286 | try self.locals.append(gpa, .{ | 180 | defer d_sym_bundle.close(); |
| 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); | | |
| 294 | | 181 | |
| 295 | try self.populateMissingMetadata(.{ | 182 | const d_sym_file = try d_sym_bundle.createFile(emit.sub_path, .{ |
| 296 | .symbol_count_hint = options.symbol_count_hint, | 183 | .truncate = false, |
| 297 | .program_code_size_hint = options.program_code_size_hint, | 184 | .read = true, |
| 298 | }); | 185 | }); |
| 299 | | 186 | |
| 300 | if (self.d_sym) |*d_sym| { | 187 | self.d_sym = .{ |
| 301 | try d_sym.populateMissingMetadata(self); | 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 | return self; | 196 | return self; |
| ... | @@ -316,26 +208,8 @@ pub fn open( | ... | @@ -316,26 +208,8 @@ pub fn open( |
| 316 | } | 208 | } |
| 317 | | 209 | |
| 318 | pub fn flush(self: *MachO, arena: Allocator, prog_node: *std.Progress.Node) link.File.FlushError!void { | 210 | pub fn flush(self: *MachO, arena: Allocator, prog_node: *std.Progress.Node) link.File.FlushError!void { |
| 319 | const comp = self.base.comp; | 211 | // TODO: what else should we do in flush? Is it actually needed at all? |
| 320 | const gpa = comp.gpa; | 212 | try self.flushModule(arena, prog_node); |
| 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 | } | | |
| 339 | } | 213 | } |
| 340 | | 214 | |
| 341 | pub fn flushModule(self: *MachO, arena: Allocator, prog_node: *std.Progress.Node) link.File.FlushError!void { | 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 | ... | @@ -344,261 +218,40 @@ pub fn flushModule(self: *MachO, arena: Allocator, prog_node: *std.Progress.Node |
| 344 | | 218 | |
| 345 | const comp = self.base.comp; | 219 | const comp = self.base.comp; |
| 346 | const gpa = comp.gpa; | 220 | const gpa = comp.gpa; |
| | 221 | _ = gpa; |
| 347 | | 222 | |
| 348 | if (self.llvm_object) |llvm_object| { | 223 | if (self.llvm_object) |llvm_object| { |
| 349 | try self.base.emitLlvmObject(arena, llvm_object, prog_node); | 224 | try self.base.emitLlvmObject(arena, llvm_object, prog_node); |
| 350 | return; | | |
| 351 | } | 225 | } |
| 352 | | 226 | |
| 353 | var sub_prog_node = prog_node.start("MachO Flush", 0); | 227 | var sub_prog_node = prog_node.start("MachO Flush", 0); |
| 354 | sub_prog_node.activate(); | 228 | sub_prog_node.activate(); |
| 355 | defer sub_prog_node.end(); | 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 | const target = comp.root_mod.resolved_target.result; | 231 | const target = comp.root_mod.resolved_target.result; |
| 360 | | 232 | _ = target; |
| 361 | if (self.lazy_syms.getPtr(.none)) |metadata| { | 233 | const directory = self.base.emit.directory; |
| 362 | // Most lazy symbols can be updated on first use, but | 234 | const full_out_path = try directory.join(arena, &[_][]const u8{self.base.emit.sub_path}); |
| 363 | // anyerror needs to wait for everything to be flushed. | 235 | const module_obj_path: ?[]const u8 = if (self.base.zcu_object_sub_path) |path| blk: { |
| 364 | if (metadata.text_state != .unused) self.updateLazySymbolAtom( | 236 | if (fs.path.dirname(full_out_path)) |dirname| { |
| 365 | File.LazySymbol.initDecl(.code, null, module), | 237 | break :blk try fs.path.join(arena, &.{ dirname, path }); |
| 366 | metadata.text_atom, | 238 | } else { |
| 367 | self.text_section_index.?, | 239 | break :blk path; |
| 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); | | |
| 523 | } | 240 | } |
| 524 | try self.writeCodeSignaturePadding(&codesig); | | |
| 525 | break :blk codesig; | | |
| 526 | } else null; | 241 | } else null; |
| 527 | defer if (codesig) |*csig| csig.deinit(gpa); | 242 | _ = module_obj_path; |
| 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 | } | | |
| 563 | | 243 | |
| 564 | try load_commands.writeRpathLCs(self, lc_writer); | 244 | // --verbose-link |
| 565 | try lc_writer.writeStruct(macho.source_version_command{ | 245 | if (comp.verbose_link) try self.dumpArgv(comp); |
| 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 | } | | |
| 586 | | 246 | |
| 587 | const ncmds = load_commands.calcNumOfLCs(lc_buffer.items); | 247 | @panic("TODO"); |
| 588 | try self.base.file.?.pwriteAll(lc_buffer.items, @sizeOf(macho.mach_header_64)); | 248 | } |
| 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 | } | | |
| 597 | | 249 | |
| 598 | if (self.d_sym) |*d_sym| { | 250 | /// --verbose-link output |
| 599 | // Flush debug symbols bundle. | 251 | fn dumpArgv(self: *MachO, comp: *Compilation) !void { |
| 600 | try d_sym.flushModule(self); | 252 | _ = self; |
| 601 | } | 253 | _ = comp; |
| | 254 | @panic("TODO dumpArgv"); |
| 602 | } | 255 | } |
| 603 | | 256 | |
| 604 | /// XNU starting with Big Sur running on arm64 is caching inodes of running binaries. | 257 | /// XNU starting with Big Sur running on arm64 is caching inodes of running binaries. |
| ... | @@ -726,4441 +379,338 @@ pub fn parsePositional( | ... | @@ -726,4441 +379,338 @@ pub fn parsePositional( |
| 726 | const tracy = trace(@src()); | 379 | const tracy = trace(@src()); |
| 727 | defer tracy.end(); | 380 | defer tracy.end(); |
| 728 | | 381 | |
| 729 | if (Object.isObject(file)) { | 382 | _ = self; |
| 730 | try self.parseObject(file, path, ctx); | 383 | _ = file; |
| 731 | } else { | 384 | _ = path; |
| 732 | try self.parseLibrary(file, path, .{ | 385 | _ = must_link; |
| 733 | .path = null, | 386 | _ = dependent_libs; |
| 734 | .needed = false, | 387 | _ = ctx; |
| 735 | .weak = false, | | |
| 736 | }, must_link, false, null, dependent_libs, ctx); | | |
| 737 | } | | |
| 738 | } | 388 | } |
| 739 | | 389 | |
| 740 | fn parseObject( | 390 | pub fn deinit(self: *MachO) void { |
| 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 | | | |
| 749 | const gpa = self.base.comp.gpa; | 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) { | 393 | if (self.llvm_object) |llvm_object| llvm_object.deinit(); |
| 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); | | |
| 775 | | 394 | |
| 776 | if (this_cpu_arch != detected_cpu_arch or | 395 | if (self.d_sym) |*d_sym| { |
| 777 | (detected_platform != null and !detected_platform.?.eqlTarget(this_platform))) | 396 | d_sym.deinit(); |
| 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; | | |
| 782 | } | 397 | } |
| 783 | | 398 | |
| 784 | try self.objects.append(gpa, object); | 399 | self.strtab.deinit(gpa); |
| 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(); | | |
| 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)) { | 403 | for (self.sections.items(.free_list)) |*list| { |
| 804 | const offset = try self.parseFatLibrary(file, target.cpu.arch, ctx); | 404 | list.deinit(gpa); |
| 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 | }; | | |
| 836 | } | 405 | } |
| | 406 | self.sections.deinit(gpa); |
| 837 | } | 407 | } |
| 838 | | 408 | |
| 839 | pub fn parseFatLibrary( | 409 | fn freeAtom(self: *MachO, atom_index: Atom.Index) void { |
| 840 | self: *MachO, | | |
| 841 | file: std.fs.File, | | |
| 842 | cpu_arch: std.Target.Cpu.Arch, | | |
| 843 | ctx: *ParseErrorCtx, | | |
| 844 | ) ParseError!u64 { | | |
| 845 | const gpa = self.base.comp.gpa; | 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); | 413 | // Remove any relocs and base relocs associated with this Atom |
| 848 | defer gpa.free(fat_archs); | 414 | Atom.freeRelocations(self, atom_index); |
| 849 | | 415 | |
| 850 | const offset = for (fat_archs) |arch| { | 416 | const atom = self.getAtom(atom_index); |
| 851 | if (arch.tag == cpu_arch) break arch.offset; | 417 | const sect_id = atom.getSymbol(self).n_sect - 1; |
| 852 | } else { | 418 | const free_list = &self.sections.items(.free_list)[sect_id]; |
| 853 | try ctx.detected_targets.ensureUnusedCapacity(fat_archs.len); | 419 | var already_have_free_list_node = false; |
| 854 | for (fat_archs) |arch| { | 420 | { |
| 855 | ctx.detected_targets.appendAssumeCapacity(try ctx.arena().dupe(u8, @tagName(arch.tag))); | 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; | 433 | } |
| 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); | | |
| 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 | 447 | if (atom.prev_index) |prev_index| { |
| 887 | if (archive.toc.values().len > 0) { | 448 | const prev = self.getAtomPtr(prev_index); |
| 888 | const offsets = archive.toc.values()[0].items; | 449 | prev.next_index = atom.next_index; |
| 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); | | |
| 893 | | 450 | |
| 894 | const detected_cpu_arch: std.Target.Cpu.Arch = switch (object.header.cputype) { | 451 | if (!already_have_free_list_node and prev.*.freeListEligible(self)) { |
| 895 | macho.CPU_TYPE_ARM64 => .aarch64, | 452 | // The free list is heuristics, it doesn't have to be perfect, so we can ignore |
| 896 | macho.CPU_TYPE_X86_64 => .x86_64, | 453 | // the OOM here. |
| 897 | else => unreachable, | 454 | free_list.append(gpa, prev_index) catch {}; |
| 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; | | |
| 909 | } | 455 | } |
| | 456 | } else { |
| | 457 | self.getAtomPtr(atom_index).prev_index = null; |
| 910 | } | 458 | } |
| 911 | | 459 | |
| 912 | if (must_link) { | 460 | if (atom.next_index) |next_index| { |
| 913 | // Get all offsets from the ToC | 461 | self.getAtomPtr(next_index).prev_index = atom.prev_index; |
| 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 | } | | |
| 925 | } else { | 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 { | 466 | // Appending to free lists is allowed to fail because the free lists are heuristics based anyway. |
| 931 | id: Dylib.Id, | 467 | const sym_index = atom.getSymbolIndex().?; |
| 932 | parent: u16, | | |
| 933 | }; | | |
| 934 | | 468 | |
| 935 | const DylibOpts = struct { | 469 | self.locals_free_list.append(gpa, sym_index) catch {}; |
| 936 | reexport_info: ?DylibReExportInfo = null, | | |
| 937 | dependent: bool = false, | | |
| 938 | needed: bool = false, | | |
| 939 | weak: bool = false, | | |
| 940 | }; | | |
| 941 | | 470 | |
| 942 | fn parseDylib( | 471 | // Try freeing GOT atom if this decl had one |
| 943 | self: *MachO, | 472 | self.got_table.freeEntry(gpa, .{ .sym_index = sym_index }); |
| 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); | | |
| 978 | | 473 | |
| 979 | if (this_cpu_arch != detected_cpu_arch or | 474 | if (self.d_sym) |*d_sym| { |
| 980 | (detected_platform != null and !detected_platform.?.eqlTarget(this_platform))) | 475 | d_sym.swapRemoveRelocs(sym_index); |
| 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; | | |
| 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( | 484 | fn shrinkAtom(self: *MachO, atom_index: Atom.Index, new_block_size: u64) void { |
| 991 | self: *MachO, | 485 | _ = self; |
| 992 | file: std.fs.File, | 486 | _ = atom_index; |
| 993 | path: []const u8, | 487 | _ = new_block_size; |
| 994 | dependent_libs: anytype, | 488 | // TODO check the new capacity, and if it crosses the size threshold into a big enough |
| 995 | dylib_options: DylibOpts, | 489 | // capacity, insert a free list node for it. |
| 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 | }; | | |
| 4328 | } | 490 | } |
| 4329 | | 491 | |
| 4330 | // TODO this function currently skips generating symbol stabs in case errors are encountered in DWARF data. | 492 | fn growAtom(self: *MachO, atom_index: Atom.Index, new_atom_size: u64, alignment: Alignment) !u64 { |
| 4331 | // I think we should actually report those errors to the user and let them decide if they want to strip debug info | 493 | _ = self; |
| 4332 | // in that case or not. | 494 | _ = atom_index; |
| 4333 | fn generateSymbolStabs( | 495 | _ = new_atom_size; |
| 4334 | self: *MachO, | 496 | _ = alignment; |
| 4335 | object: Object, | 497 | @panic("TODO growAtom"); |
| 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 | }); | | |
| 4459 | } | 498 | } |
| 4460 | | 499 | |
| 4461 | fn generateSymbolStabsForSymbol( | 500 | pub fn updateFunc(self: *MachO, mod: *Module, func_index: InternPool.Index, air: Air, liveness: Liveness) !void { |
| 4462 | self: *MachO, | 501 | if (build_options.skip_non_native and builtin.object_format != .macho) { |
| 4463 | atom_index: Atom.Index, | 502 | @panic("Attempted to compile for object format that was disabled by build configuration"); |
| 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]; | | |
| 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: { | 506 | @panic("TODO updateFunc"); |
| 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; | | |
| 4551 | } | 507 | } |
| 4552 | | 508 | |
| 4553 | pub fn writeStrtab(self: *MachO) !void { | 509 | pub fn lowerUnnamedConst(self: *MachO, typed_value: TypedValue, decl_index: InternPool.DeclIndex) !u32 { |
| 4554 | const gpa = self.base.comp.gpa; | 510 | _ = self; |
| 4555 | const seg = self.getLinkeditSegmentPtr(); | 511 | _ = typed_value; |
| 4556 | const offset = seg.fileoff + seg.filesize; | 512 | _ = decl_index; |
| 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); | | |
| 4570 | | 513 | |
| 4571 | self.symtab_cmd.stroff = @as(u32, @intCast(offset)); | 514 | @panic("TODO lowerUnnamedConst"); |
| 4572 | self.symtab_cmd.strsize = @as(u32, @intCast(needed_size_aligned)); | | |
| 4573 | } | 515 | } |
| 4574 | | 516 | |
| 4575 | const SymtabCtx = struct { | 517 | const LowerConstResult = union(enum) { |
| 4576 | nlocalsym: u32, | 518 | ok: Atom.Index, |
| 4577 | nextdefsym: u32, | 519 | fail: *Module.ErrorMsg, |
| 4578 | nundefsym: u32, | | |
| 4579 | imports_table: std.AutoHashMap(SymbolWithLoc, u32), | | |
| 4580 | }; | 520 | }; |
| 4581 | | 521 | |
| 4582 | pub fn writeDysymtab(self: *MachO, ctx: SymtabCtx) !void { | 522 | fn lowerConst( |
| 4583 | const gpa = self.base.comp.gpa; | 523 | self: *MachO, |
| 4584 | const nstubs = @as(u32, @intCast(self.stub_table.lookup.count())); | 524 | name: []const u8, |
| 4585 | const ngot_entries = @as(u32, @intCast(self.got_table.lookup.count())); | 525 | tv: TypedValue, |
| 4586 | const nindirectsyms = nstubs * 2 + ngot_entries; | 526 | required_alignment: InternPool.Alignment, |
| 4587 | const iextdefsym = ctx.nlocalsym; | 527 | sect_id: u8, |
| 4588 | const iundefsym = iextdefsym + ctx.nextdefsym; | 528 | src_loc: Module.SrcLoc, |
| 4589 | | 529 | ) !LowerConstResult { |
| 4590 | const seg = self.getLinkeditSegmentPtr(); | 530 | _ = self; |
| 4591 | const offset = seg.fileoff + seg.filesize; | 531 | _ = name; |
| 4592 | assert(mem.isAlignedGeneric(u64, offset, @alignOf(u64))); | 532 | _ = tv; |
| 4593 | const needed_size = nindirectsyms * @sizeOf(u32); | 533 | _ = required_alignment; |
| 4594 | const needed_size_aligned = mem.alignForward(u64, needed_size, @alignOf(u64)); | 534 | _ = sect_id; |
| 4595 | seg.filesize = offset + needed_size_aligned - seg.fileoff; | 535 | _ = src_loc; |
| 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 | } | | |
| 4946 | | 536 | |
| 4947 | /// Returns name of the symbol described by `sym_with_loc` descriptor. | 537 | @panic("TODO lowerConst"); |
| 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 | } | | |
| 4956 | } | 538 | } |
| 4957 | | 539 | |
| 4958 | const BoundarySymbolKind = enum { | 540 | pub fn updateDecl(self: *MachO, mod: *Module, decl_index: InternPool.DeclIndex) !void { |
| 4959 | start, | 541 | if (build_options.skip_non_native and builtin.object_format != .macho) { |
| 4960 | stop, | 542 | @panic("Attempted to compile for object format that was disabled by build configuration"); |
| 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, "$") orelse return null; | | |
| 4980 | const segname = names[0..sep_idx]; | | |
| 4981 | const sectname = names[sep_idx + 1 ..]; | | |
| 4982 | return .{ .kind = kind, .segname = segname, .sectname = sectname }; | | |
| 4983 | } | 543 | } |
| 4984 | return null; | 544 | if (self.llvm_object) |llvm_object| return llvm_object.updateDecl(mod, decl_index); |
| 4985 | } | | |
| 4986 | | 545 | |
| 4987 | const SegmentBoundarySymbol = struct { | 546 | const tracy = trace(@src()); |
| 4988 | kind: BoundarySymbolKind, | 547 | defer tracy.end(); |
| 4989 | segname: []const u8, | | |
| 4990 | }; | | |
| 4991 | | 548 | |
| 4992 | pub fn getSegmentBoundarySymbol(self: *const MachO, sym_with_loc: SymbolWithLoc) ?SegmentBoundarySymbol { | 549 | @panic("TODO updateDecl"); |
| 4993 | const sym_name = self.getSymbolName(sym_with_loc); | | |
| 4994 | if (mem.startsWith(u8, sym_name, "segment$")) { | | |
| 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; | | |
| 5005 | } | 550 | } |
| 5006 | | 551 | |
| 5007 | /// Returns pointer to the global entry for `name` if one exists. | 552 | fn updateLazySymbolAtom( |
| 5008 | pub fn getGlobalPtr(self: *MachO, name: []const u8) ?*SymbolWithLoc { | 553 | self: *MachO, |
| 5009 | const global_index = self.resolver.get(name) orelse return null; | 554 | sym: File.LazySymbol, |
| 5010 | return &self.globals.items[global_index]; | 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. | 565 | pub fn getOrCreateAtomForLazySymbol(self: *MachO, sym: File.LazySymbol) !Atom.Index { |
| 5014 | pub fn getGlobal(self: *const MachO, name: []const u8) ?SymbolWithLoc { | 566 | _ = self; |
| 5015 | const global_index = self.resolver.get(name) orelse return null; | 567 | _ = sym; |
| 5016 | return self.globals.items[global_index]; | 568 | @panic("TODO getOrCreateAtomForLazySymbol"); |
| 5017 | } | 569 | } |
| 5018 | | 570 | |
| 5019 | /// Returns the index of the global entry for `name` if one exists. | 571 | pub fn getOrCreateAtomForDecl(self: *MachO, decl_index: InternPool.DeclIndex) !Atom.Index { |
| 5020 | pub fn getGlobalIndex(self: *const MachO, name: []const u8) ?u32 { | 572 | _ = self; |
| 5021 | return self.resolver.get(name); | 573 | _ = decl_index; |
| | 574 | @panic("TODO getOrCreateAtomForDecl"); |
| 5022 | } | 575 | } |
| 5023 | | 576 | |
| 5024 | /// Returns global entry at `index`. | 577 | fn getDeclOutputSection(self: *MachO, decl_index: InternPool.DeclIndex) u8 { |
| 5025 | pub fn getGlobalByIndex(self: *const MachO, index: u32) SymbolWithLoc { | 578 | _ = self; |
| 5026 | assert(index < self.globals.items.len); | 579 | _ = decl_index; |
| 5027 | return self.globals.items[index]; | 580 | @panic("TODO getDeclOutputSection"); |
| 5028 | } | 581 | } |
| 5029 | | 582 | |
| 5030 | const GetOrPutGlobalPtrResult = struct { | 583 | fn updateDeclCode(self: *MachO, decl_index: InternPool.DeclIndex, code: []u8) !u64 { |
| 5031 | found_existing: bool, | 584 | _ = self; |
| 5032 | value_ptr: *SymbolWithLoc, | 585 | _ = decl_index; |
| 5033 | }; | 586 | _ = code; |
| | 587 | @panic("TODO updateDeclCode"); |
| | 588 | } |
| 5034 | | 589 | |
| 5035 | /// Used only for disambiguating local from global at relocation level. | 590 | pub fn updateDeclLineNumber(self: *MachO, module: *Module, decl_index: InternPool.DeclIndex) !void { |
| 5036 | /// TODO this must go away. | 591 | if (self.d_sym) |*d_sym| { |
| 5037 | pub const global_symbol_bit: u32 = 0x80000000; | 592 | try d_sym.dwarf.updateDeclLineNumber(module, decl_index); |
| 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 }; | | |
| 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 { | 596 | pub fn updateExports( |
| 5056 | assert(atom_index < self.atoms.items.len); | 597 | self: *MachO, |
| 5057 | return self.atoms.items[atom_index]; | 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 { | 611 | pub fn deleteDeclExport( |
| 5061 | assert(atom_index < self.atoms.items.len); | 612 | self: *MachO, |
| 5062 | return &self.atoms.items[atom_index]; | 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. | 622 | fn freeUnnamedConsts(self: *MachO, decl_index: InternPool.DeclIndex) void { |
| 5066 | /// Returns null on failure. | 623 | _ = self; |
| 5067 | pub fn getAtomIndexForSymbol(self: *MachO, sym_with_loc: SymbolWithLoc) ?Atom.Index { | 624 | _ = decl_index; |
| 5068 | assert(sym_with_loc.getFile() == null); | 625 | @panic("TODO freeUnnamedConst"); |
| 5069 | return self.atom_by_index_table.get(sym_with_loc.sym_index); | | |
| 5070 | } | 626 | } |
| 5071 | | 627 | |
| 5072 | pub fn getGotEntryAddress(self: *MachO, sym_with_loc: SymbolWithLoc) ?u64 { | 628 | pub fn freeDecl(self: *MachO, decl_index: InternPool.DeclIndex) void { |
| 5073 | const index = self.got_table.lookup.get(sym_with_loc) orelse return null; | 629 | if (self.llvm_object) |llvm_object| return llvm_object.freeDecl(decl_index); |
| 5074 | const header = self.sections.items(.header)[self.got_section_index.?]; | 630 | @panic("TODO freeDecl"); |
| 5075 | return header.addr + @sizeOf(u64) * index; | | |
| 5076 | } | 631 | } |
| 5077 | | 632 | |
| 5078 | pub fn getTlvPtrEntryAddress(self: *MachO, sym_with_loc: SymbolWithLoc) ?u64 { | 633 | pub fn getDeclVAddr(self: *MachO, decl_index: InternPool.DeclIndex, reloc_info: File.RelocInfo) !u64 { |
| 5079 | const index = self.tlv_ptr_table.lookup.get(sym_with_loc) orelse return null; | 634 | assert(self.llvm_object == null); |
| 5080 | const header = self.sections.items(.header)[self.tlv_ptr_section_index.?]; | 635 | _ = decl_index; |
| 5081 | return header.addr + @sizeOf(u64) * index; | 636 | _ = reloc_info; |
| | 637 | @panic("TODO getDeclVAddr"); |
| 5082 | } | 638 | } |
| 5083 | | 639 | |
| 5084 | pub fn getStubsEntryAddress(self: *MachO, sym_with_loc: SymbolWithLoc) ?u64 { | 640 | pub fn lowerAnonDecl( |
| 5085 | const target = self.base.comp.root_mod.resolved_target.result; | 641 | self: *MachO, |
| 5086 | const index = self.stub_table.lookup.get(sym_with_loc) orelse return null; | 642 | decl_val: InternPool.Index, |
| 5087 | const header = self.sections.items(.header)[self.stubs_section_index.?]; | 643 | explicit_alignment: InternPool.Alignment, |
| 5088 | return header.addr + stubs.stubSize(target.cpu.arch) * index; | 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. | 653 | pub fn getAnonDeclVAddr(self: *MachO, decl_val: InternPool.Index, reloc_info: link.File.RelocInfo) !u64 { |
| 5092 | /// Asserts output mode is executable. | 654 | assert(self.llvm_object == null); |
| 5093 | pub fn getEntryPoint(self: MachO) ?SymbolWithLoc { | 655 | _ = decl_val; |
| 5094 | const entry_name = self.entry_name orelse return null; | 656 | _ = reloc_info; |
| 5095 | const global = self.getGlobal(entry_name) orelse return null; | 657 | @panic("TODO getAnonDeclVAddr"); |
| 5096 | return global; | | |
| 5097 | } | 658 | } |
| 5098 | | 659 | |
| 5099 | pub fn getDebugSymbols(self: *MachO) ?*DebugSymbols { | 660 | pub fn getGlobalSymbol(self: *MachO, name: []const u8, lib_name: ?[]const u8) !u32 { |
| 5100 | if (self.d_sym == null) return null; | 661 | _ = self; |
| 5101 | return &self.d_sym.?; | 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 { | 667 | pub fn padToIdeal(actual_size: anytype) @TypeOf(actual_size) { |
| 5105 | return switch (cpu_arch) { | 668 | return actual_size +| (actual_size / ideal_factor); |
| 5106 | .aarch64 => 0x4000, | | |
| 5107 | .x86_64 => 0x1000, | | |
| 5108 | else => unreachable, | | |
| 5109 | }; | | |
| 5110 | } | 669 | } |
| 5111 | | 670 | |
| 5112 | pub fn requiresCodeSignature(m: *MachO) bool { | 671 | fn detectAllocCollision(self: *MachO, start: u64, size: u64) ?u64 { |
| 5113 | if (m.entitlements) |_| return true; | 672 | // TODO: header and load commands have to be part of the __TEXT segment |
| 5114 | const comp = m.base.comp; | 673 | const header_size = self.segments.items[self.header_segment_cmd_index.?].filesize; |
| 5115 | const target = comp.root_mod.resolved_target.result; | 674 | if (start < header_size) |
| 5116 | const cpu_arch = target.cpu.arch; | 675 | return header_size; |
| 5117 | const os_tag = target.os.tag; | 676 | |
| 5118 | const abi = target.abi; | 677 | const end = start + padToIdeal(size); |
| 5119 | if (cpu_arch == .aarch64 and (os_tag == .macos or abi == .simulator)) return true; | 678 | |
| 5120 | return false; | 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 { | 691 | fn allocatedSize(self: *MachO, start: u64) u64 { |
| 5124 | if (mem.eql(u8, segname, "__PAGEZERO")) return 0x0; | 692 | if (start == 0) |
| 5125 | if (mem.eql(u8, segname, "__TEXT")) return 0x1; | 693 | return 0; |
| 5126 | if (mem.eql(u8, segname, "__DATA_CONST")) return 0x2; | 694 | var min_pos: u64 = std.math.maxInt(u64); |
| 5127 | if (mem.eql(u8, segname, "__DATA")) return 0x3; | 695 | for (self.sections.items(.header)) |header| { |
| 5128 | if (mem.eql(u8, segname, "__LINKEDIT")) return 0x5; | 696 | if (header.offset <= start) continue; |
| 5129 | return 0x4; | 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 { | 702 | fn findFreeSpace(self: *MachO, object_size: u64, min_alignment: u32) u64 { |
| 5133 | if (mem.eql(u8, segname, "__PAGEZERO")) return macho.PROT.NONE; | 703 | var start: u64 = 0; |
| 5134 | if (mem.eql(u8, segname, "__TEXT")) return macho.PROT.READ | macho.PROT.EXEC; | 704 | while (self.detectAllocCollision(start, object_size)) |item_end| { |
| 5135 | if (mem.eql(u8, segname, "__LINKEDIT")) return macho.PROT.READ; | 705 | start = mem.alignForward(u64, item_end, min_alignment); |
| 5136 | return macho.PROT.READ | macho.PROT.WRITE; | 706 | } |
| | 707 | return start; |
| 5137 | } | 708 | } |
| 5138 | | 709 | |
| 5139 | pub fn getSectionPrecedence(header: macho.section_64) u8 { | 710 | pub fn makeStaticString(bytes: []const u8) [16]u8 { |
| 5140 | const segment_precedence: u4 = getSegmentPrecedence(header.segName()); | 711 | var buf = [_]u8{0} ** 16; |
| 5141 | const section_precedence: u4 = blk: { | 712 | @memcpy(buf[0..bytes.len], bytes); |
| 5142 | if (header.isCode()) { | 713 | return buf; |
| 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; | | |
| 5164 | } | 714 | } |
| 5165 | | 715 | |
| 5166 | pub const ParseErrorCtx = struct { | 716 | pub const ParseErrorCtx = struct { |
| ... | @@ -5354,308 +904,105 @@ pub fn reportUndefined(self: *MachO) error{OutOfMemory}!void { | ... | @@ -5354,308 +904,105 @@ pub fn reportUndefined(self: *MachO) error{OutOfMemory}!void { |
| 5354 | } | 904 | } |
| 5355 | } | 905 | } |
| 5356 | | 906 | |
| 5357 | fn reportSymbolCollision( | 907 | // fn reportSymbolCollision( |
| 5358 | self: *MachO, | 908 | // self: *MachO, |
| 5359 | first: SymbolWithLoc, | 909 | // first: SymbolWithLoc, |
| 5360 | other: SymbolWithLoc, | 910 | // other: SymbolWithLoc, |
| 5361 | ) error{OutOfMemory}!void { | 911 | // ) error{OutOfMemory}!void { |
| 5362 | const comp = self.base.comp; | 912 | // const comp = self.base.comp; |
| 5363 | const gpa = comp.gpa; | 913 | // const gpa = comp.gpa; |
| 5364 | try comp.link_errors.ensureUnusedCapacity(gpa, 1); | 914 | // try comp.link_errors.ensureUnusedCapacity(gpa, 1); |
| 5365 | | 915 | |
| 5366 | var notes = try std.ArrayList(File.ErrorMsg).initCapacity(gpa, 2); | 916 | // var notes = try std.ArrayList(File.ErrorMsg).initCapacity(gpa, 2); |
| 5367 | defer notes.deinit(); | 917 | // defer notes.deinit(); |
| 5368 | | 918 | |
| 5369 | if (first.getFile()) |file| { | 919 | // if (first.getFile()) |file| { |
| 5370 | const note = try std.fmt.allocPrint(gpa, "first definition in {s}", .{ | 920 | // const note = try std.fmt.allocPrint(gpa, "first definition in {s}", .{ |
| 5371 | self.objects.items[file].name, | 921 | // self.objects.items[file].name, |
| 5372 | }); | 922 | // }); |
| 5373 | notes.appendAssumeCapacity(.{ .msg = note }); | 923 | // notes.appendAssumeCapacity(.{ .msg = note }); |
| 5374 | } | 924 | // } |
| 5375 | if (other.getFile()) |file| { | 925 | // if (other.getFile()) |file| { |
| 5376 | const note = try std.fmt.allocPrint(gpa, "next definition in {s}", .{ | 926 | // const note = try std.fmt.allocPrint(gpa, "next definition in {s}", .{ |
| 5377 | self.objects.items[file].name, | 927 | // self.objects.items[file].name, |
| 5378 | }); | 928 | // }); |
| 5379 | notes.appendAssumeCapacity(.{ .msg = note }); | 929 | // notes.appendAssumeCapacity(.{ .msg = note }); |
| 5380 | } | 930 | // } |
| 5381 | | 931 | |
| 5382 | var err_msg = File.ErrorMsg{ .msg = try std.fmt.allocPrint(gpa, "symbol {s} defined multiple times", .{ | 932 | // var err_msg = File.ErrorMsg{ .msg = try std.fmt.allocPrint(gpa, "symbol {s} defined multiple times", .{ |
| 5383 | self.getSymbolName(first), | 933 | // self.getSymbolName(first), |
| 5384 | }) }; | 934 | // }) }; |
| 5385 | err_msg.notes = try notes.toOwnedSlice(); | 935 | // err_msg.notes = try notes.toOwnedSlice(); |
| 5386 | | 936 | |
| 5387 | comp.link_errors.appendAssumeCapacity(err_msg); | 937 | // comp.link_errors.appendAssumeCapacity(err_msg); |
| 5388 | } | 938 | // } |
| 5389 | | 939 | |
| 5390 | fn reportUnhandledSymbolType(self: *MachO, sym_with_loc: SymbolWithLoc) error{OutOfMemory}!void { | 940 | // fn reportUnhandledSymbolType(self: *MachO, sym_with_loc: SymbolWithLoc) error{OutOfMemory}!void { |
| 5391 | const comp = self.base.comp; | 941 | // const comp = self.base.comp; |
| 5392 | const gpa = comp.gpa; | 942 | // const gpa = comp.gpa; |
| 5393 | try comp.link_errors.ensureUnusedCapacity(gpa, 1); | 943 | // try comp.link_errors.ensureUnusedCapacity(gpa, 1); |
| 5394 | | 944 | |
| 5395 | const notes = try gpa.alloc(File.ErrorMsg, 1); | 945 | // const notes = try gpa.alloc(File.ErrorMsg, 1); |
| 5396 | errdefer gpa.free(notes); | 946 | // errdefer gpa.free(notes); |
| 5397 | | 947 | |
| 5398 | const file = sym_with_loc.getFile().?; | 948 | // const file = sym_with_loc.getFile().?; |
| 5399 | notes[0] = .{ .msg = try std.fmt.allocPrint(gpa, "defined in {s}", .{self.objects.items[file].name}) }; | 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); | 970 | pub fn getDebugSymbols(self: *MachO) ?*DebugSymbols { |
| 5402 | const sym_type = if (sym.stab()) | 971 | if (self.d_sym) |*ds| { |
| 5403 | "stab" | 972 | return ds; |
| 5404 | else if (sym.indr()) | 973 | } else return null; |
| 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; | | |
| 5437 | } | 974 | } |
| 5438 | | 975 | |
| 5439 | /// Linear search | 976 | pub fn ptraceAttach(self: *MachO, pid: std.os.pid_t) !void { |
| 5440 | pub fn lsearch(comptime T: type, haystack: []align(1) const T, predicate: anytype) usize { | 977 | if (!is_hot_update_compatible) return; |
| 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 | } | | |
| 5450 | | 978 | |
| 5451 | pub fn logSegments(self: *MachO) void { | 979 | const mach_task = try std.os.darwin.machTaskForPid(pid); |
| 5452 | log.debug("segments:", .{}); | 980 | log.debug("Mach task for pid {d}: {any}", .{ pid, mach_task }); |
| 5453 | for (self.segments.items, 0..) |segment, i| { | 981 | self.hot_state.mach_task = mach_task; |
| 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 | } | | |
| 5463 | | 982 | |
| 5464 | pub fn logSections(self: *MachO) void { | 983 | // TODO start exception handler in another thread |
| 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 | } | | |
| 5477 | | 984 | |
| 5478 | fn logSymAttributes(sym: macho.nlist_64, buf: []u8) []const u8 { | 985 | // TODO enable ones we register for exceptions |
| 5479 | if (sym.sect()) { | 986 | // try std.os.ptrace(std.os.darwin.PT.ATTACHEXC, pid, 0, 0); |
| 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..]; | | |
| 5496 | } | 987 | } |
| 5497 | | 988 | |
| 5498 | pub fn logSymtab(self: *MachO) void { | 989 | pub fn ptraceDetach(self: *MachO, pid: std.os.pid_t) !void { |
| 5499 | var buf: [4]u8 = undefined; | 990 | if (!is_hot_update_compatible) return; |
| 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 | } | | |
| 5593 | | 991 | |
| 5594 | pub fn logAtoms(self: *MachO) void { | 992 | _ = pid; |
| 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]; | | |
| 5600 | | 993 | |
| 5601 | log.debug("{s},{s}", .{ header.segName(), header.sectName() }); | 994 | // TODO stop exception handler |
| 5602 | | 995 | |
| 5603 | while (true) { | 996 | // TODO see comment in ptraceAttach |
| 5604 | const atom = self.getAtom(atom_index); | 997 | // try std.os.ptrace(std.os.darwin.PT.DETACH, pid, 0, 0); |
| 5605 | self.logAtom(atom_index, log); | | |
| 5606 | | 998 | |
| 5607 | if (atom.next_index) |next_index| { | 999 | self.hot_state.mach_task = null; |
| 5608 | atom_index = next_index; | | |
| 5609 | } else break; | | |
| 5610 | } | | |
| 5611 | } | | |
| 5612 | } | 1000 | } |
| 5613 | | 1001 | |
| 5614 | pub fn logAtom(self: *MachO, atom_index: Atom.Index, logger: anytype) void { | 1002 | const is_hot_update_compatible = switch (builtin.target.os.tag) { |
| 5615 | if (!build_options.enable_logging) return; | 1003 | .macos => true, |
| 5616 | | 1004 | else => false, |
| 5617 | const atom = self.getAtom(atom_index); | 1005 | }; |
| 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 | } | | |
| 5659 | | 1006 | |
| 5660 | const default_entry_symbol_name = "_main"; | 1007 | const default_entry_symbol_name = "_main"; |
| 5661 | | 1008 | |
| ... | @@ -5663,17 +1010,6 @@ pub const base_tag: File.Tag = File.Tag.macho; | ... | @@ -5663,17 +1010,6 @@ pub const base_tag: File.Tag = File.Tag.macho; |
| 5663 | pub const N_DEAD: u16 = @as(u16, @bitCast(@as(i16, -1))); | 1010 | pub const N_DEAD: u16 = @as(u16, @bitCast(@as(i16, -1))); |
| 5664 | pub const N_BOUNDARY: u16 = @as(u16, @bitCast(@as(i16, -2))); | 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 | pub const Section = struct { | 1013 | pub const Section = struct { |
| 5678 | header: macho.section_64, | 1014 | header: macho.section_64, |
| 5679 | segment_index: u8, | 1015 | segment_index: u8, |
| ... | @@ -5698,11 +1034,6 @@ pub const Section = struct { | ... | @@ -5698,11 +1034,6 @@ pub const Section = struct { |
| 5698 | free_list: std.ArrayListUnmanaged(Atom.Index) = .{}, | 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 | const LazySymbolTable = std.AutoArrayHashMapUnmanaged(InternPool.OptionalDeclIndex, LazySymbolMetadata); | 1037 | const LazySymbolTable = std.AutoArrayHashMapUnmanaged(InternPool.OptionalDeclIndex, LazySymbolMetadata); |
| 5707 | | 1038 | |
| 5708 | const LazySymbolMetadata = struct { | 1039 | const LazySymbolMetadata = struct { |
| ... | @@ -5713,8 +1044,6 @@ const LazySymbolMetadata = struct { | ... | @@ -5713,8 +1044,6 @@ const LazySymbolMetadata = struct { |
| 5713 | data_const_state: State = .unused, | 1044 | data_const_state: State = .unused, |
| 5714 | }; | 1045 | }; |
| 5715 | | 1046 | |
| 5716 | const TlvSymbolTable = std.AutoArrayHashMapUnmanaged(SymbolWithLoc, Atom.Index); | | |
| 5717 | | | |
| 5718 | const DeclMetadata = struct { | 1047 | const DeclMetadata = struct { |
| 5719 | atom: Atom.Index, | 1048 | atom: Atom.Index, |
| 5720 | section: u8, | 1049 | section: u8, |
| ... | @@ -5737,38 +1066,143 @@ const DeclMetadata = struct { | ... | @@ -5737,38 +1066,143 @@ const DeclMetadata = struct { |
| 5737 | } | 1066 | } |
| 5738 | }; | 1067 | }; |
| 5739 | | 1068 | |
| 5740 | const DeclTable = std.AutoArrayHashMapUnmanaged(InternPool.DeclIndex, DeclMetadata); | 1069 | const HotUpdateState = struct { |
| 5741 | const AnonDeclTable = std.AutoHashMapUnmanaged(InternPool.Index, DeclMetadata); | 1070 | mach_task: ?std.os.darwin.MachTask = null, |
| 5742 | const BindingTable = std.AutoArrayHashMapUnmanaged(Atom.Index, std.ArrayListUnmanaged(Atom.Binding)); | 1071 | }; |
| 5743 | const UnnamedConstTable = std.AutoArrayHashMapUnmanaged(InternPool.DeclIndex, std.ArrayListUnmanaged(Atom.Index)); | 1072 | |
| 5744 | const RebaseTable = std.AutoArrayHashMapUnmanaged(Atom.Index, std.ArrayListUnmanaged(u32)); | 1073 | pub const SymtabCtx = struct { |
| 5745 | const RelocationTable = std.AutoArrayHashMapUnmanaged(Atom.Index, std.ArrayListUnmanaged(Relocation)); | 1074 | ilocal: u32 = 0, |
| 5746 | const ActionTable = std.AutoHashMapUnmanaged(u32, RelocFlags); | 1075 | istab: u32 = 0, |
| 5747 | | 1076 | iexport: u32 = 0, |
| 5748 | pub const RelocFlags = packed struct { | 1077 | iimport: u32 = 0, |
| 5749 | add_got: bool = false, | 1078 | nlocals: u32 = 0, |
| 5750 | add_stub: bool = false, | 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 { | 1085 | pub const null_sym = macho.nlist_64{ |
| 5754 | // Index into the respective symbol table. | 1086 | .n_strx = 0, |
| 5755 | sym_index: u32, | 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. | 1146 | pub fn minor(v: Version) u8 { |
| 5758 | file: u32 = 0, | 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 { | 1170 | pub fn new(maj: u16, min: u8, pat: u8) Version { |
| 5761 | if (self.file == 0) return null; | 1171 | return .{ .value = (@as(u32, @intCast(maj)) << 16) | (@as(u32, @intCast(min)) << 8) | pat }; |
| 5762 | return self.file - 1; | | |
| 5763 | } | 1172 | } |
| 5764 | | 1173 | |
| 5765 | pub fn eql(self: SymbolWithLoc, other: SymbolWithLoc) bool { | 1174 | pub fn format( |
| 5766 | return self.file == other.file and self.sym_index == other.sym_index; | 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 { | 1190 | const SupportedPlatforms = struct { |
| 5771 | mach_task: ?std.os.darwin.MachTask = null, | 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 | /// When allocating, the ideal_capacity is calculated by | 1208 | /// When allocating, the ideal_capacity is calculated by |
| ... | @@ -5812,20 +1246,20 @@ const fat = @import("MachO/fat.zig"); | ... | @@ -5812,20 +1246,20 @@ const fat = @import("MachO/fat.zig"); |
| 5812 | const link = @import("../link.zig"); | 1246 | const link = @import("../link.zig"); |
| 5813 | const llvm_backend = @import("../codegen/llvm.zig"); | 1247 | const llvm_backend = @import("../codegen/llvm.zig"); |
| 5814 | const load_commands = @import("MachO/load_commands.zig"); | 1248 | const load_commands = @import("MachO/load_commands.zig"); |
| 5815 | const stubs = @import("MachO/stubs.zig"); | | |
| 5816 | const tapi = @import("tapi.zig"); | 1249 | const tapi = @import("tapi.zig"); |
| 5817 | const target_util = @import("../target.zig"); | 1250 | const target_util = @import("../target.zig"); |
| 5818 | const thunks = @import("MachO/thunks.zig"); | 1251 | const thunks = @import("MachO/thunks.zig"); |
| 5819 | const trace = @import("../tracy.zig").trace; | 1252 | const trace = @import("../tracy.zig").trace; |
| 5820 | const zld = @import("MachO/zld.zig"); | | |
| 5821 | | 1253 | |
| 5822 | const Air = @import("../Air.zig"); | 1254 | const Air = @import("../Air.zig"); |
| | 1255 | const Alignment = Atom.Alignment; |
| 5823 | const Allocator = mem.Allocator; | 1256 | const Allocator = mem.Allocator; |
| 5824 | const Archive = @import("MachO/Archive.zig"); | 1257 | const Archive = @import("MachO/Archive.zig"); |
| 5825 | pub const Atom = @import("MachO/Atom.zig"); | 1258 | pub const Atom = @import("MachO/Atom.zig"); |
| 5826 | const Cache = std.Build.Cache; | 1259 | const Cache = std.Build.Cache; |
| 5827 | const CodeSignature = @import("MachO/CodeSignature.zig"); | 1260 | const CodeSignature = @import("MachO/CodeSignature.zig"); |
| 5828 | const Compilation = @import("../Compilation.zig"); | 1261 | const Compilation = @import("../Compilation.zig"); |
| | 1262 | pub const DebugSymbols = @import("MachO/DebugSymbols.zig"); |
| 5829 | const Dwarf = File.Dwarf; | 1263 | const Dwarf = File.Dwarf; |
| 5830 | const DwarfInfo = @import("MachO/DwarfInfo.zig"); | 1264 | const DwarfInfo = @import("MachO/DwarfInfo.zig"); |
| 5831 | const Dylib = @import("MachO/Dylib.zig"); | 1265 | const Dylib = @import("MachO/Dylib.zig"); |
| ... | @@ -5837,17 +1271,9 @@ const LlvmObject = @import("../codegen/llvm.zig").Object; | ... | @@ -5837,17 +1271,9 @@ const LlvmObject = @import("../codegen/llvm.zig").Object; |
| 5837 | const Md5 = std.crypto.hash.Md5; | 1271 | const Md5 = std.crypto.hash.Md5; |
| 5838 | const Module = @import("../Module.zig"); | 1272 | const Module = @import("../Module.zig"); |
| 5839 | const InternPool = @import("../InternPool.zig"); | 1273 | const InternPool = @import("../InternPool.zig"); |
| 5840 | const Platform = load_commands.Platform; | | |
| 5841 | const Relocation = @import("MachO/Relocation.zig"); | 1274 | const Relocation = @import("MachO/Relocation.zig"); |
| 5842 | const StringTable = @import("StringTable.zig"); | 1275 | const StringTable = @import("StringTable.zig"); |
| 5843 | const TableSection = @import("table_section.zig").TableSection; | 1276 | const TableSection = @import("table_section.zig").TableSection; |
| 5844 | const Trie = @import("MachO/Trie.zig"); | | |
| 5845 | const Type = @import("../type.zig").Type; | 1277 | const Type = @import("../type.zig").Type; |
| 5846 | const TypedValue = @import("../TypedValue.zig"); | 1278 | const TypedValue = @import("../TypedValue.zig"); |
| 5847 | const Value = @import("../value.zig").Value; | 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