1 //===- MachO.h - MachO object file implementation ---------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file declares the MachOObjectFile class, which implement the ObjectFile
11 // interface for MachO files.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_OBJECT_MACHO_H
16 #define LLVM_OBJECT_MACHO_H
18 #include "llvm/ADT/ArrayRef.h"
19 #include "llvm/ADT/SmallVector.h"
20 #include "llvm/ADT/Triple.h"
21 #include "llvm/Object/ObjectFile.h"
22 #include "llvm/Support/MachO.h"
27 /// DiceRef - This is a value type class that represents a single
28 /// data in code entry in the table in a Mach-O object file.
30 DataRefImpl DicePimpl;
31 const ObjectFile *OwningObject;
34 DiceRef() : OwningObject(nullptr) { }
36 DiceRef(DataRefImpl DiceP, const ObjectFile *Owner);
38 bool operator==(const DiceRef &Other) const;
39 bool operator<(const DiceRef &Other) const;
43 std::error_code getOffset(uint32_t &Result) const;
44 std::error_code getLength(uint16_t &Result) const;
45 std::error_code getKind(uint16_t &Result) const;
47 DataRefImpl getRawDataRefImpl() const;
48 const ObjectFile *getObjectFile() const;
50 typedef content_iterator<DiceRef> dice_iterator;
52 /// ExportEntry encapsulates the current-state-of-the-walk used when doing a
53 /// non-recursive walk of the trie data structure. This allows you to iterate
54 /// across all exported symbols using:
55 /// for (const llvm::object::ExportEntry &AnExport : Obj->exports()) {
59 ExportEntry(ArrayRef<uint8_t> Trie);
61 StringRef name() const;
62 uint64_t flags() const;
63 uint64_t address() const;
64 uint64_t other() const;
65 StringRef otherName() const;
66 uint32_t nodeOffset() const;
68 bool operator==(const ExportEntry &) const;
73 friend class MachOObjectFile;
76 uint64_t readULEB128(const uint8_t *&p);
77 void pushDownUntilBottom();
78 void pushNode(uint64_t Offset);
80 // Represents a node in the mach-o exports trie.
82 NodeState(const uint8_t *Ptr);
84 const uint8_t *Current;
88 const char *ImportName;
90 unsigned NextChildIndex;
91 unsigned ParentStringLength;
95 ArrayRef<uint8_t> Trie;
96 SmallString<256> CumulativeString;
97 SmallVector<NodeState, 16> Stack;
101 typedef content_iterator<ExportEntry> export_iterator;
103 /// MachORebaseEntry encapsulates the current state in the decompression of
104 /// rebasing opcodes. This allows you to iterate through the compressed table of
106 /// for (const llvm::object::MachORebaseEntry &Entry : Obj->rebaseTable()) {
108 class MachORebaseEntry {
110 MachORebaseEntry(ArrayRef<uint8_t> opcodes, bool is64Bit);
112 uint32_t segmentIndex() const;
113 uint64_t segmentOffset() const;
114 StringRef typeName() const;
116 bool operator==(const MachORebaseEntry &) const;
121 friend class MachOObjectFile;
124 uint64_t readULEB128();
126 ArrayRef<uint8_t> Opcodes;
128 uint64_t SegmentOffset;
129 uint32_t SegmentIndex;
130 uint64_t RemainingLoopCount;
131 uint64_t AdvanceAmount;
137 typedef content_iterator<MachORebaseEntry> rebase_iterator;
139 /// MachOBindEntry encapsulates the current state in the decompression of
140 /// binding opcodes. This allows you to iterate through the compressed table of
142 /// for (const llvm::object::MachOBindEntry &Entry : Obj->bindTable()) {
144 class MachOBindEntry {
146 enum class Kind { Regular, Lazy, Weak };
148 MachOBindEntry(ArrayRef<uint8_t> Opcodes, bool is64Bit, MachOBindEntry::Kind);
150 uint32_t segmentIndex() const;
151 uint64_t segmentOffset() const;
152 StringRef typeName() const;
153 StringRef symbolName() const;
154 uint32_t flags() const;
155 int64_t addend() const;
158 bool operator==(const MachOBindEntry &) const;
163 friend class MachOObjectFile;
166 uint64_t readULEB128();
167 int64_t readSLEB128();
169 ArrayRef<uint8_t> Opcodes;
171 uint64_t SegmentOffset;
172 uint32_t SegmentIndex;
173 StringRef SymbolName;
177 uint64_t RemainingLoopCount;
178 uint64_t AdvanceAmount;
185 typedef content_iterator<MachOBindEntry> bind_iterator;
187 class MachOObjectFile : public ObjectFile {
189 struct LoadCommandInfo {
190 const char *Ptr; // Where in memory the load command is.
191 MachO::load_command C; // The command itself.
194 MachOObjectFile(MemoryBufferRef Object, bool IsLittleEndian, bool Is64Bits,
195 std::error_code &EC);
197 void moveSymbolNext(DataRefImpl &Symb) const override;
198 std::error_code getSymbolName(DataRefImpl Symb,
199 StringRef &Res) const override;
202 std::error_code getIndirectName(DataRefImpl Symb, StringRef &Res) const;
204 std::error_code getSymbolAddress(DataRefImpl Symb,
205 uint64_t &Res) const override;
206 std::error_code getSymbolAlignment(DataRefImpl Symb,
207 uint32_t &Res) const override;
208 std::error_code getSymbolSize(DataRefImpl Symb, uint64_t &Res) const override;
209 std::error_code getSymbolType(DataRefImpl Symb,
210 SymbolRef::Type &Res) const override;
211 uint32_t getSymbolFlags(DataRefImpl Symb) const override;
212 std::error_code getSymbolSection(DataRefImpl Symb,
213 section_iterator &Res) const override;
215 void moveSectionNext(DataRefImpl &Sec) const override;
216 std::error_code getSectionName(DataRefImpl Sec,
217 StringRef &Res) const override;
218 uint64_t getSectionAddress(DataRefImpl Sec) const override;
219 uint64_t getSectionSize(DataRefImpl Sec) const override;
220 std::error_code getSectionContents(DataRefImpl Sec,
221 StringRef &Res) const override;
222 uint64_t getSectionAlignment(DataRefImpl Sec) const override;
223 bool isSectionText(DataRefImpl Sec) const override;
224 bool isSectionData(DataRefImpl Sec) const override;
225 bool isSectionBSS(DataRefImpl Sec) const override;
226 bool isSectionRequiredForExecution(DataRefImpl Sec) const override;
227 bool isSectionVirtual(DataRefImpl Sec) const override;
228 bool isSectionZeroInit(DataRefImpl Sec) const override;
229 bool isSectionReadOnlyData(DataRefImpl Sec) const override;
230 bool sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb) const override;
231 relocation_iterator section_rel_begin(DataRefImpl Sec) const override;
232 relocation_iterator section_rel_end(DataRefImpl Sec) const override;
234 void moveRelocationNext(DataRefImpl &Rel) const override;
235 std::error_code getRelocationAddress(DataRefImpl Rel,
236 uint64_t &Res) const override;
237 std::error_code getRelocationOffset(DataRefImpl Rel,
238 uint64_t &Res) const override;
239 symbol_iterator getRelocationSymbol(DataRefImpl Rel) const override;
240 std::error_code getRelocationType(DataRefImpl Rel,
241 uint64_t &Res) const override;
243 getRelocationTypeName(DataRefImpl Rel,
244 SmallVectorImpl<char> &Result) const override;
246 getRelocationValueString(DataRefImpl Rel,
247 SmallVectorImpl<char> &Result) const override;
248 std::error_code getRelocationHidden(DataRefImpl Rel,
249 bool &Result) const override;
252 std::error_code getLibraryShortNameByIndex(unsigned Index, StringRef &) const;
254 // TODO: Would be useful to have an iterator based version
255 // of the load command interface too.
257 basic_symbol_iterator symbol_begin_impl() const override;
258 basic_symbol_iterator symbol_end_impl() const override;
261 basic_symbol_iterator getSymbolByIndex(unsigned Index) const;
263 section_iterator section_begin() const override;
264 section_iterator section_end() const override;
266 uint8_t getBytesInAddress() const override;
268 StringRef getFileFormatName() const override;
269 unsigned getArch() const override;
270 Triple getArch(const char **McpuDefault, Triple *ThumbTriple) const;
272 relocation_iterator section_rel_begin(unsigned Index) const;
273 relocation_iterator section_rel_end(unsigned Index) const;
275 dice_iterator begin_dices() const;
276 dice_iterator end_dices() const;
278 /// For use iterating over all exported symbols.
279 iterator_range<export_iterator> exports() const;
281 /// For use examining a trie not in a MachOObjectFile.
282 static iterator_range<export_iterator> exports(ArrayRef<uint8_t> Trie);
284 /// For use iterating over all rebase table entries.
285 iterator_range<rebase_iterator> rebaseTable() const;
287 /// For use examining rebase opcodes not in a MachOObjectFile.
288 static iterator_range<rebase_iterator> rebaseTable(ArrayRef<uint8_t> Opcodes,
291 /// For use iterating over all bind table entries.
292 iterator_range<bind_iterator> bindTable() const;
294 /// For use iterating over all lazy bind table entries.
295 iterator_range<bind_iterator> lazyBindTable() const;
297 /// For use iterating over all lazy bind table entries.
298 iterator_range<bind_iterator> weakBindTable() const;
300 /// For use examining bind opcodes not in a MachOObjectFile.
301 static iterator_range<bind_iterator> bindTable(ArrayRef<uint8_t> Opcodes,
303 MachOBindEntry::Kind);
306 // In a MachO file, sections have a segment name. This is used in the .o
307 // files. They have a single segment, but this field specifies which segment
308 // a section should be put in in the final object.
309 StringRef getSectionFinalSegmentName(DataRefImpl Sec) const;
311 // Names are stored as 16 bytes. These returns the raw 16 bytes without
312 // interpreting them as a C string.
313 ArrayRef<char> getSectionRawName(DataRefImpl Sec) const;
314 ArrayRef<char> getSectionRawFinalSegmentName(DataRefImpl Sec) const;
316 // MachO specific Info about relocations.
317 bool isRelocationScattered(const MachO::any_relocation_info &RE) const;
318 unsigned getPlainRelocationSymbolNum(
319 const MachO::any_relocation_info &RE) const;
320 bool getPlainRelocationExternal(const MachO::any_relocation_info &RE) const;
321 bool getScatteredRelocationScattered(
322 const MachO::any_relocation_info &RE) const;
323 uint32_t getScatteredRelocationValue(
324 const MachO::any_relocation_info &RE) const;
325 unsigned getAnyRelocationAddress(const MachO::any_relocation_info &RE) const;
326 unsigned getAnyRelocationPCRel(const MachO::any_relocation_info &RE) const;
327 unsigned getAnyRelocationLength(const MachO::any_relocation_info &RE) const;
328 unsigned getAnyRelocationType(const MachO::any_relocation_info &RE) const;
329 SectionRef getRelocationSection(const MachO::any_relocation_info &RE) const;
331 // Walk load commands.
332 LoadCommandInfo getFirstLoadCommandInfo() const;
333 LoadCommandInfo getNextLoadCommandInfo(const LoadCommandInfo &L) const;
335 // MachO specific structures.
336 MachO::section getSection(DataRefImpl DRI) const;
337 MachO::section_64 getSection64(DataRefImpl DRI) const;
338 MachO::section getSection(const LoadCommandInfo &L, unsigned Index) const;
339 MachO::section_64 getSection64(const LoadCommandInfo &L,unsigned Index) const;
340 MachO::nlist getSymbolTableEntry(DataRefImpl DRI) const;
341 MachO::nlist_64 getSymbol64TableEntry(DataRefImpl DRI) const;
343 MachO::linkedit_data_command
344 getLinkeditDataLoadCommand(const LoadCommandInfo &L) const;
345 MachO::segment_command
346 getSegmentLoadCommand(const LoadCommandInfo &L) const;
347 MachO::segment_command_64
348 getSegment64LoadCommand(const LoadCommandInfo &L) const;
349 MachO::linker_options_command
350 getLinkerOptionsLoadCommand(const LoadCommandInfo &L) const;
351 MachO::version_min_command
352 getVersionMinLoadCommand(const LoadCommandInfo &L) const;
354 getDylibIDLoadCommand(const LoadCommandInfo &L) const;
355 MachO::dyld_info_command
356 getDyldInfoLoadCommand(const LoadCommandInfo &L) const;
357 MachO::dylinker_command
358 getDylinkerCommand(const LoadCommandInfo &L) const;
360 getUuidCommand(const LoadCommandInfo &L) const;
361 MachO::source_version_command
362 getSourceVersionCommand(const LoadCommandInfo &L) const;
363 MachO::entry_point_command
364 getEntryPointCommand(const LoadCommandInfo &L) const;
366 MachO::any_relocation_info getRelocation(DataRefImpl Rel) const;
367 MachO::data_in_code_entry getDice(DataRefImpl Rel) const;
368 MachO::mach_header getHeader() const;
369 MachO::mach_header_64 getHeader64() const;
371 getIndirectSymbolTableEntry(const MachO::dysymtab_command &DLC,
372 unsigned Index) const;
373 MachO::data_in_code_entry getDataInCodeTableEntry(uint32_t DataOffset,
374 unsigned Index) const;
375 MachO::symtab_command getSymtabLoadCommand() const;
376 MachO::dysymtab_command getDysymtabLoadCommand() const;
377 MachO::linkedit_data_command getDataInCodeLoadCommand() const;
378 ArrayRef<uint8_t> getDyldInfoRebaseOpcodes() const;
379 ArrayRef<uint8_t> getDyldInfoBindOpcodes() const;
380 ArrayRef<uint8_t> getDyldInfoWeakBindOpcodes() const;
381 ArrayRef<uint8_t> getDyldInfoLazyBindOpcodes() const;
382 ArrayRef<uint8_t> getDyldInfoExportsTrie() const;
383 ArrayRef<uint8_t> getUuid() const;
385 StringRef getStringTableData() const;
386 bool is64Bit() const;
387 void ReadULEB128s(uint64_t Index, SmallVectorImpl<uint64_t> &Out) const;
389 static StringRef guessLibraryShortName(StringRef Name, bool &isFramework,
392 static Triple::ArchType getArch(uint32_t CPUType);
393 static Triple getArch(uint32_t CPUType, uint32_t CPUSubType,
394 const char **McpuDefault = nullptr);
395 static Triple getThumbArch(uint32_t CPUType, uint32_t CPUSubType,
396 const char **McpuDefault = nullptr);
397 static Triple getArch(uint32_t CPUType, uint32_t CPUSubType,
398 const char **McpuDefault, Triple *ThumbTriple);
399 static bool isValidArch(StringRef ArchFlag);
400 static Triple getHostArch();
402 bool isRelocatableObject() const override;
404 bool hasPageZeroSegment() const { return HasPageZeroSegment; }
406 static bool classof(const Binary *v) {
411 typedef SmallVector<const char*, 1> SectionList;
412 SectionList Sections;
413 typedef SmallVector<const char*, 1> LibraryList;
414 LibraryList Libraries;
415 typedef SmallVector<StringRef, 1> LibraryShortName;
416 mutable LibraryShortName LibrariesShortNames;
417 const char *SymtabLoadCmd;
418 const char *DysymtabLoadCmd;
419 const char *DataInCodeLoadCmd;
420 const char *DyldInfoLoadCmd;
421 const char *UuidLoadCmd;
422 bool HasPageZeroSegment;
426 inline DiceRef::DiceRef(DataRefImpl DiceP, const ObjectFile *Owner)
427 : DicePimpl(DiceP) , OwningObject(Owner) {}
429 inline bool DiceRef::operator==(const DiceRef &Other) const {
430 return DicePimpl == Other.DicePimpl;
433 inline bool DiceRef::operator<(const DiceRef &Other) const {
434 return DicePimpl < Other.DicePimpl;
437 inline void DiceRef::moveNext() {
438 const MachO::data_in_code_entry *P =
439 reinterpret_cast<const MachO::data_in_code_entry *>(DicePimpl.p);
440 DicePimpl.p = reinterpret_cast<uintptr_t>(P + 1);
443 // Since a Mach-O data in code reference, a DiceRef, can only be created when
444 // the OwningObject ObjectFile is a MachOObjectFile a static_cast<> is used for
445 // the methods that get the values of the fields of the reference.
447 inline std::error_code DiceRef::getOffset(uint32_t &Result) const {
448 const MachOObjectFile *MachOOF =
449 static_cast<const MachOObjectFile *>(OwningObject);
450 MachO::data_in_code_entry Dice = MachOOF->getDice(DicePimpl);
451 Result = Dice.offset;
452 return object_error::success;
455 inline std::error_code DiceRef::getLength(uint16_t &Result) const {
456 const MachOObjectFile *MachOOF =
457 static_cast<const MachOObjectFile *>(OwningObject);
458 MachO::data_in_code_entry Dice = MachOOF->getDice(DicePimpl);
459 Result = Dice.length;
460 return object_error::success;
463 inline std::error_code DiceRef::getKind(uint16_t &Result) const {
464 const MachOObjectFile *MachOOF =
465 static_cast<const MachOObjectFile *>(OwningObject);
466 MachO::data_in_code_entry Dice = MachOOF->getDice(DicePimpl);
468 return object_error::success;
471 inline DataRefImpl DiceRef::getRawDataRefImpl() const {
475 inline const ObjectFile *DiceRef::getObjectFile() const {