1 //===- ObjectFile.h - File format independent object file -------*- 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 a file format independent ObjectFile class.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_OBJECT_OBJECT_FILE_H
15 #define LLVM_OBJECT_OBJECT_FILE_H
17 #include "llvm/Object/Binary.h"
18 #include "llvm/ADT/StringRef.h"
19 #include "llvm/Support/DataTypes.h"
20 #include "llvm/Support/ErrorHandling.h"
21 #include "llvm/Support/MemoryBuffer.h"
32 // ELF needs this for relocations. This entire union should probably be a
33 // char[max(8, sizeof(uintptr_t))] and require the impl to cast.
42 std::memset(this, 0, sizeof(DataRefImpl));
46 template<class content_type>
47 class content_iterator {
50 content_iterator(content_type symb)
53 const content_type* operator->() const {
57 const content_type &operator*() const {
61 bool operator==(const content_iterator &other) const {
62 return Current == other.Current;
65 bool operator!=(const content_iterator &other) const {
66 return !(*this == other);
69 content_iterator& increment(error_code &err) {
71 if (error_code ec = Current.getNext(next))
79 static bool operator ==(const DataRefImpl &a, const DataRefImpl &b) {
80 // Check bitwise identical. This is the only legal way to compare a union w/o
81 // knowing which member is in use.
82 return std::memcmp(&a, &b, sizeof(DataRefImpl)) == 0;
85 static bool operator <(const DataRefImpl &a, const DataRefImpl &b) {
86 // Check bitwise identical. This is the only legal way to compare a union w/o
87 // knowing which member is in use.
88 return std::memcmp(&a, &b, sizeof(DataRefImpl)) < 0;
93 /// RelocationRef - This is a value type class that represents a single
94 /// relocation in the list of relocations in the object file.
96 DataRefImpl RelocationPimpl;
97 const ObjectFile *OwningObject;
100 RelocationRef() : OwningObject(NULL) { }
102 RelocationRef(DataRefImpl RelocationP, const ObjectFile *Owner);
104 bool operator==(const RelocationRef &Other) const;
106 error_code getNext(RelocationRef &Result) const;
108 error_code getAddress(uint64_t &Result) const;
109 error_code getOffset(uint64_t &Result) const;
110 error_code getSymbol(SymbolRef &Result) const;
111 error_code getType(uint64_t &Result) const;
113 /// @brief Indicates whether this relocation should hidden when listing
114 /// relocations, usually because it is the trailing part of a multipart
115 /// relocation that will be printed as part of the leading relocation.
116 error_code getHidden(bool &Result) const;
118 /// @brief Get a string that represents the type of this relocation.
120 /// This is for display purposes only.
121 error_code getTypeName(SmallVectorImpl<char> &Result) const;
122 error_code getAdditionalInfo(int64_t &Result) const;
124 /// @brief Get a string that represents the calculation of the value of this
127 /// This is for display purposes only.
128 error_code getValueString(SmallVectorImpl<char> &Result) const;
130 typedef content_iterator<RelocationRef> relocation_iterator;
132 /// SectionRef - This is a value type class that represents a single section in
133 /// the list of sections in the object file.
135 friend class SymbolRef;
136 DataRefImpl SectionPimpl;
137 const ObjectFile *OwningObject;
140 SectionRef() : OwningObject(NULL) { }
142 SectionRef(DataRefImpl SectionP, const ObjectFile *Owner);
144 bool operator==(const SectionRef &Other) const;
145 bool operator <(const SectionRef &Other) const;
147 error_code getNext(SectionRef &Result) const;
149 error_code getName(StringRef &Result) const;
150 error_code getAddress(uint64_t &Result) const;
151 error_code getSize(uint64_t &Result) const;
152 error_code getContents(StringRef &Result) const;
154 /// @brief Get the alignment of this section as the actual value (not log 2).
155 error_code getAlignment(uint64_t &Result) const;
157 // FIXME: Move to the normalization layer when it's created.
158 error_code isText(bool &Result) const;
159 error_code isData(bool &Result) const;
160 error_code isBSS(bool &Result) const;
161 error_code isRequiredForExecution(bool &Result) const;
162 error_code isVirtual(bool &Result) const;
163 error_code isZeroInit(bool &Result) const;
165 error_code containsSymbol(SymbolRef S, bool &Result) const;
167 relocation_iterator begin_relocations() const;
168 relocation_iterator end_relocations() const;
170 DataRefImpl getRawDataRefImpl() const;
172 typedef content_iterator<SectionRef> section_iterator;
174 /// SymbolRef - This is a value type class that represents a single symbol in
175 /// the list of symbols in the object file.
177 friend class SectionRef;
178 DataRefImpl SymbolPimpl;
179 const ObjectFile *OwningObject;
182 SymbolRef() : OwningObject(NULL) { }
185 ST_Unknown, // Type not specified
195 SF_Undefined = 1U << 0, // Symbol is defined in another object file
196 SF_Global = 1U << 1, // Global symbol
197 SF_Weak = 1U << 2, // Weak symbol
198 SF_Absolute = 1U << 3, // Absolute symbol
199 SF_ThreadLocal = 1U << 4, // Thread local symbol
200 SF_Common = 1U << 5, // Symbol has common linkage
201 SF_FormatSpecific = 1U << 31 // Specific to the object file format
202 // (e.g. section symbols)
205 SymbolRef(DataRefImpl SymbolP, const ObjectFile *Owner);
207 bool operator==(const SymbolRef &Other) const;
208 bool operator <(const SymbolRef &Other) const;
210 error_code getNext(SymbolRef &Result) const;
212 error_code getName(StringRef &Result) const;
213 error_code getAddress(uint64_t &Result) const;
214 error_code getFileOffset(uint64_t &Result) const;
215 error_code getSize(uint64_t &Result) const;
216 error_code getType(SymbolRef::Type &Result) const;
218 /// Returns the ascii char that should be displayed in a symbol table dump via
219 /// nm for this symbol.
220 error_code getNMTypeChar(char &Result) const;
222 /// Get symbol flags (bitwise OR of SymbolRef::Flags)
223 error_code getFlags(uint32_t &Result) const;
225 /// @brief Return true for common symbols such as uninitialized globals
226 error_code isCommon(bool &Result) const;
228 /// @brief Get section this symbol is defined in reference to. Result is
229 /// end_sections() if it is undefined or is an absolute symbol.
230 error_code getSection(section_iterator &Result) const;
232 DataRefImpl getRawDataRefImpl() const;
234 typedef content_iterator<SymbolRef> symbol_iterator;
236 /// LibraryRef - This is a value type class that represents a single library in
237 /// the list of libraries needed by a shared or dynamic object.
239 friend class SectionRef;
240 DataRefImpl LibraryPimpl;
241 const ObjectFile *OwningObject;
244 LibraryRef() : OwningObject(NULL) { }
246 LibraryRef(DataRefImpl LibraryP, const ObjectFile *Owner);
248 bool operator==(const LibraryRef &Other) const;
249 bool operator <(const LibraryRef &Other) const;
251 error_code getNext(LibraryRef &Result) const;
253 // Get the path to this library, as stored in the object file.
254 error_code getPath(StringRef &Result) const;
256 DataRefImpl getRawDataRefImpl() const;
258 typedef content_iterator<LibraryRef> library_iterator;
260 const uint64_t UnknownAddressOrSize = ~0ULL;
262 /// ObjectFile - This class is the base class for all object file types.
263 /// Concrete instances of this object are created by createObjectFile, which
264 /// figure out which type to create.
265 class ObjectFile : public Binary {
266 virtual void anchor();
267 ObjectFile(); // = delete
268 ObjectFile(const ObjectFile &other); // = delete
271 ObjectFile(unsigned int Type, MemoryBuffer *source, error_code &ec);
273 const uint8_t *base() const {
274 return reinterpret_cast<const uint8_t *>(Data->getBufferStart());
277 // These functions are for SymbolRef to call internally. The main goal of
278 // this is to allow SymbolRef::SymbolPimpl to point directly to the symbol
279 // entry in the memory mapped object file. SymbolPimpl cannot contain any
280 // virtual functions because then it could not point into the memory mapped
283 // Implementations assume that the DataRefImpl is valid and has not been
284 // modified externally. It's UB otherwise.
285 friend class SymbolRef;
286 virtual error_code getSymbolNext(DataRefImpl Symb, SymbolRef &Res) const = 0;
287 virtual error_code getSymbolName(DataRefImpl Symb, StringRef &Res) const = 0;
288 virtual error_code getSymbolAddress(DataRefImpl Symb, uint64_t &Res) const =0;
289 virtual error_code getSymbolFileOffset(DataRefImpl Symb, uint64_t &Res) const =0;
290 virtual error_code getSymbolSize(DataRefImpl Symb, uint64_t &Res) const = 0;
291 virtual error_code getSymbolType(DataRefImpl Symb,
292 SymbolRef::Type &Res) const = 0;
293 virtual error_code getSymbolNMTypeChar(DataRefImpl Symb, char &Res) const = 0;
294 virtual error_code getSymbolFlags(DataRefImpl Symb,
295 uint32_t &Res) const = 0;
296 virtual error_code getSymbolSection(DataRefImpl Symb,
297 section_iterator &Res) const = 0;
299 // Same as above for SectionRef.
300 friend class SectionRef;
301 virtual error_code getSectionNext(DataRefImpl Sec, SectionRef &Res) const = 0;
302 virtual error_code getSectionName(DataRefImpl Sec, StringRef &Res) const = 0;
303 virtual error_code getSectionAddress(DataRefImpl Sec, uint64_t &Res) const =0;
304 virtual error_code getSectionSize(DataRefImpl Sec, uint64_t &Res) const = 0;
305 virtual error_code getSectionContents(DataRefImpl Sec, StringRef &Res)const=0;
306 virtual error_code getSectionAlignment(DataRefImpl Sec, uint64_t &Res)const=0;
307 virtual error_code isSectionText(DataRefImpl Sec, bool &Res) const = 0;
308 virtual error_code isSectionData(DataRefImpl Sec, bool &Res) const = 0;
309 virtual error_code isSectionBSS(DataRefImpl Sec, bool &Res) const = 0;
310 virtual error_code isSectionRequiredForExecution(DataRefImpl Sec,
311 bool &Res) const = 0;
312 // A section is 'virtual' if its contents aren't present in the object image.
313 virtual error_code isSectionVirtual(DataRefImpl Sec, bool &Res) const = 0;
314 virtual error_code isSectionZeroInit(DataRefImpl Sec, bool &Res) const = 0;
315 virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
316 bool &Result) const = 0;
317 virtual relocation_iterator getSectionRelBegin(DataRefImpl Sec) const = 0;
318 virtual relocation_iterator getSectionRelEnd(DataRefImpl Sec) const = 0;
321 // Same as above for RelocationRef.
322 friend class RelocationRef;
323 virtual error_code getRelocationNext(DataRefImpl Rel,
324 RelocationRef &Res) const = 0;
325 virtual error_code getRelocationAddress(DataRefImpl Rel,
326 uint64_t &Res) const =0;
327 virtual error_code getRelocationOffset(DataRefImpl Rel,
328 uint64_t &Res) const =0;
329 virtual error_code getRelocationSymbol(DataRefImpl Rel,
330 SymbolRef &Res) const = 0;
331 virtual error_code getRelocationType(DataRefImpl Rel,
332 uint64_t &Res) const = 0;
333 virtual error_code getRelocationTypeName(DataRefImpl Rel,
334 SmallVectorImpl<char> &Result) const = 0;
335 virtual error_code getRelocationAdditionalInfo(DataRefImpl Rel,
336 int64_t &Res) const = 0;
337 virtual error_code getRelocationValueString(DataRefImpl Rel,
338 SmallVectorImpl<char> &Result) const = 0;
339 virtual error_code getRelocationHidden(DataRefImpl Rel, bool &Result) const {
341 return object_error::success;
344 // Same for LibraryRef
345 friend class LibraryRef;
346 virtual error_code getLibraryNext(DataRefImpl Lib, LibraryRef &Res) const = 0;
347 virtual error_code getLibraryPath(DataRefImpl Lib, StringRef &Res) const = 0;
351 virtual symbol_iterator begin_symbols() const = 0;
352 virtual symbol_iterator end_symbols() const = 0;
354 virtual symbol_iterator begin_dynamic_symbols() const = 0;
355 virtual symbol_iterator end_dynamic_symbols() const = 0;
357 virtual section_iterator begin_sections() const = 0;
358 virtual section_iterator end_sections() const = 0;
360 virtual library_iterator begin_libraries_needed() const = 0;
361 virtual library_iterator end_libraries_needed() const = 0;
363 /// @brief The number of bytes used to represent an address in this object
365 virtual uint8_t getBytesInAddress() const = 0;
367 virtual StringRef getFileFormatName() const = 0;
368 virtual /* Triple::ArchType */ unsigned getArch() const = 0;
370 /// For shared objects, returns the name which this object should be
371 /// loaded from at runtime. This corresponds to DT_SONAME on ELF and
372 /// LC_ID_DYLIB (install name) on MachO.
373 virtual StringRef getLoadName() const = 0;
375 /// @returns Pointer to ObjectFile subclass to handle this type of object.
376 /// @param ObjectPath The path to the object file. ObjectPath.isObject must
378 /// @brief Create ObjectFile from path.
379 static ObjectFile *createObjectFile(StringRef ObjectPath);
380 static ObjectFile *createObjectFile(MemoryBuffer *Object);
382 static inline bool classof(const Binary *v) {
383 return v->isObject();
385 static inline bool classof(const ObjectFile *v) { return true; }
388 static ObjectFile *createCOFFObjectFile(MemoryBuffer *Object);
389 static ObjectFile *createELFObjectFile(MemoryBuffer *Object);
390 static ObjectFile *createMachOObjectFile(MemoryBuffer *Object);
393 // Inline function definitions.
394 inline SymbolRef::SymbolRef(DataRefImpl SymbolP, const ObjectFile *Owner)
395 : SymbolPimpl(SymbolP)
396 , OwningObject(Owner) {}
398 inline bool SymbolRef::operator==(const SymbolRef &Other) const {
399 return SymbolPimpl == Other.SymbolPimpl;
402 inline bool SymbolRef::operator <(const SymbolRef &Other) const {
403 return SymbolPimpl < Other.SymbolPimpl;
406 inline error_code SymbolRef::getNext(SymbolRef &Result) const {
407 return OwningObject->getSymbolNext(SymbolPimpl, Result);
410 inline error_code SymbolRef::getName(StringRef &Result) const {
411 return OwningObject->getSymbolName(SymbolPimpl, Result);
414 inline error_code SymbolRef::getAddress(uint64_t &Result) const {
415 return OwningObject->getSymbolAddress(SymbolPimpl, Result);
418 inline error_code SymbolRef::getFileOffset(uint64_t &Result) const {
419 return OwningObject->getSymbolFileOffset(SymbolPimpl, Result);
422 inline error_code SymbolRef::getSize(uint64_t &Result) const {
423 return OwningObject->getSymbolSize(SymbolPimpl, Result);
426 inline error_code SymbolRef::getNMTypeChar(char &Result) const {
427 return OwningObject->getSymbolNMTypeChar(SymbolPimpl, Result);
430 inline error_code SymbolRef::getFlags(uint32_t &Result) const {
431 return OwningObject->getSymbolFlags(SymbolPimpl, Result);
434 inline error_code SymbolRef::getSection(section_iterator &Result) const {
435 return OwningObject->getSymbolSection(SymbolPimpl, Result);
438 inline error_code SymbolRef::getType(SymbolRef::Type &Result) const {
439 return OwningObject->getSymbolType(SymbolPimpl, Result);
442 inline DataRefImpl SymbolRef::getRawDataRefImpl() const {
448 inline SectionRef::SectionRef(DataRefImpl SectionP,
449 const ObjectFile *Owner)
450 : SectionPimpl(SectionP)
451 , OwningObject(Owner) {}
453 inline bool SectionRef::operator==(const SectionRef &Other) const {
454 return SectionPimpl == Other.SectionPimpl;
457 inline bool SectionRef::operator <(const SectionRef &Other) const {
458 return SectionPimpl < Other.SectionPimpl;
461 inline error_code SectionRef::getNext(SectionRef &Result) const {
462 return OwningObject->getSectionNext(SectionPimpl, Result);
465 inline error_code SectionRef::getName(StringRef &Result) const {
466 return OwningObject->getSectionName(SectionPimpl, Result);
469 inline error_code SectionRef::getAddress(uint64_t &Result) const {
470 return OwningObject->getSectionAddress(SectionPimpl, Result);
473 inline error_code SectionRef::getSize(uint64_t &Result) const {
474 return OwningObject->getSectionSize(SectionPimpl, Result);
477 inline error_code SectionRef::getContents(StringRef &Result) const {
478 return OwningObject->getSectionContents(SectionPimpl, Result);
481 inline error_code SectionRef::getAlignment(uint64_t &Result) const {
482 return OwningObject->getSectionAlignment(SectionPimpl, Result);
485 inline error_code SectionRef::isText(bool &Result) const {
486 return OwningObject->isSectionText(SectionPimpl, Result);
489 inline error_code SectionRef::isData(bool &Result) const {
490 return OwningObject->isSectionData(SectionPimpl, Result);
493 inline error_code SectionRef::isBSS(bool &Result) const {
494 return OwningObject->isSectionBSS(SectionPimpl, Result);
497 inline error_code SectionRef::isRequiredForExecution(bool &Result) const {
498 return OwningObject->isSectionRequiredForExecution(SectionPimpl, Result);
501 inline error_code SectionRef::isVirtual(bool &Result) const {
502 return OwningObject->isSectionVirtual(SectionPimpl, Result);
505 inline error_code SectionRef::isZeroInit(bool &Result) const {
506 return OwningObject->isSectionZeroInit(SectionPimpl, Result);
509 inline error_code SectionRef::containsSymbol(SymbolRef S, bool &Result) const {
510 return OwningObject->sectionContainsSymbol(SectionPimpl, S.SymbolPimpl,
514 inline relocation_iterator SectionRef::begin_relocations() const {
515 return OwningObject->getSectionRelBegin(SectionPimpl);
518 inline relocation_iterator SectionRef::end_relocations() const {
519 return OwningObject->getSectionRelEnd(SectionPimpl);
522 inline DataRefImpl SectionRef::getRawDataRefImpl() const {
527 inline RelocationRef::RelocationRef(DataRefImpl RelocationP,
528 const ObjectFile *Owner)
529 : RelocationPimpl(RelocationP)
530 , OwningObject(Owner) {}
532 inline bool RelocationRef::operator==(const RelocationRef &Other) const {
533 return RelocationPimpl == Other.RelocationPimpl;
536 inline error_code RelocationRef::getNext(RelocationRef &Result) const {
537 return OwningObject->getRelocationNext(RelocationPimpl, Result);
540 inline error_code RelocationRef::getAddress(uint64_t &Result) const {
541 return OwningObject->getRelocationAddress(RelocationPimpl, Result);
544 inline error_code RelocationRef::getOffset(uint64_t &Result) const {
545 return OwningObject->getRelocationOffset(RelocationPimpl, Result);
548 inline error_code RelocationRef::getSymbol(SymbolRef &Result) const {
549 return OwningObject->getRelocationSymbol(RelocationPimpl, Result);
552 inline error_code RelocationRef::getType(uint64_t &Result) const {
553 return OwningObject->getRelocationType(RelocationPimpl, Result);
556 inline error_code RelocationRef::getTypeName(SmallVectorImpl<char> &Result)
558 return OwningObject->getRelocationTypeName(RelocationPimpl, Result);
561 inline error_code RelocationRef::getAdditionalInfo(int64_t &Result) const {
562 return OwningObject->getRelocationAdditionalInfo(RelocationPimpl, Result);
565 inline error_code RelocationRef::getValueString(SmallVectorImpl<char> &Result)
567 return OwningObject->getRelocationValueString(RelocationPimpl, Result);
570 inline error_code RelocationRef::getHidden(bool &Result) const {
571 return OwningObject->getRelocationHidden(RelocationPimpl, Result);
573 // Inline function definitions.
574 inline LibraryRef::LibraryRef(DataRefImpl LibraryP, const ObjectFile *Owner)
575 : LibraryPimpl(LibraryP)
576 , OwningObject(Owner) {}
578 inline bool LibraryRef::operator==(const LibraryRef &Other) const {
579 return LibraryPimpl == Other.LibraryPimpl;
582 inline bool LibraryRef::operator <(const LibraryRef &Other) const {
583 return LibraryPimpl < Other.LibraryPimpl;
586 inline error_code LibraryRef::getNext(LibraryRef &Result) const {
587 return OwningObject->getLibraryNext(LibraryPimpl, Result);
590 inline error_code LibraryRef::getPath(StringRef &Result) const {
591 return OwningObject->getLibraryPath(LibraryPimpl, Result);
594 } // end namespace object
595 } // end namespace llvm