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_OBJECTFILE_H
15 #define LLVM_OBJECT_OBJECTFILE_H
17 #include "llvm/ADT/StringRef.h"
18 #include "llvm/Object/SymbolicFile.h"
19 #include "llvm/Support/DataTypes.h"
20 #include "llvm/Support/ErrorHandling.h"
21 #include "llvm/Support/FileSystem.h"
22 #include "llvm/Support/MemoryBuffer.h"
32 class symbol_iterator;
34 /// RelocationRef - This is a value type class that represents a single
35 /// relocation in the list of relocations in the object file.
37 DataRefImpl RelocationPimpl;
38 const ObjectFile *OwningObject;
41 RelocationRef() : OwningObject(NULL) { }
43 RelocationRef(DataRefImpl RelocationP, const ObjectFile *Owner);
45 bool operator==(const RelocationRef &Other) const;
49 error_code getAddress(uint64_t &Result) const;
50 error_code getOffset(uint64_t &Result) const;
51 symbol_iterator getSymbol() const;
52 error_code getType(uint64_t &Result) const;
54 /// @brief Indicates whether this relocation should hidden when listing
55 /// relocations, usually because it is the trailing part of a multipart
56 /// relocation that will be printed as part of the leading relocation.
57 error_code getHidden(bool &Result) const;
59 /// @brief Get a string that represents the type of this relocation.
61 /// This is for display purposes only.
62 error_code getTypeName(SmallVectorImpl<char> &Result) const;
64 /// @brief Get a string that represents the calculation of the value of this
67 /// This is for display purposes only.
68 error_code getValueString(SmallVectorImpl<char> &Result) const;
70 DataRefImpl getRawDataRefImpl() const;
71 const ObjectFile *getObjectFile() const;
73 typedef content_iterator<RelocationRef> relocation_iterator;
75 /// SectionRef - This is a value type class that represents a single section in
76 /// the list of sections in the object file.
78 typedef content_iterator<SectionRef> section_iterator;
80 friend class SymbolRef;
81 DataRefImpl SectionPimpl;
82 const ObjectFile *OwningObject;
85 SectionRef() : OwningObject(NULL) { }
87 SectionRef(DataRefImpl SectionP, const ObjectFile *Owner);
89 bool operator==(const SectionRef &Other) const;
90 bool operator<(const SectionRef &Other) const;
94 error_code getName(StringRef &Result) const;
95 error_code getAddress(uint64_t &Result) const;
96 error_code getSize(uint64_t &Result) const;
97 error_code getContents(StringRef &Result) const;
99 /// @brief Get the alignment of this section as the actual value (not log 2).
100 error_code getAlignment(uint64_t &Result) const;
102 // FIXME: Move to the normalization layer when it's created.
103 error_code isText(bool &Result) const;
104 error_code isData(bool &Result) const;
105 error_code isBSS(bool &Result) const;
106 error_code isRequiredForExecution(bool &Result) const;
107 error_code isVirtual(bool &Result) const;
108 error_code isZeroInit(bool &Result) const;
109 error_code isReadOnlyData(bool &Result) const;
111 error_code containsSymbol(SymbolRef S, bool &Result) const;
113 relocation_iterator relocation_begin() const;
114 relocation_iterator relocation_end() const;
115 section_iterator getRelocatedSection() const;
117 DataRefImpl getRawDataRefImpl() const;
120 /// SymbolRef - This is a value type class that represents a single symbol in
121 /// the list of symbols in the object file.
122 class SymbolRef : public BasicSymbolRef {
123 friend class SectionRef;
126 SymbolRef() : BasicSymbolRef() {}
129 ST_Unknown, // Type not specified
137 SymbolRef(DataRefImpl SymbolP, const ObjectFile *Owner);
139 error_code getName(StringRef &Result) const;
140 /// Returns the symbol virtual address (i.e. address at which it will be
142 error_code getAddress(uint64_t &Result) const;
143 error_code getFileOffset(uint64_t &Result) const;
144 /// @brief Get the alignment of this symbol as the actual value (not log 2).
145 error_code getAlignment(uint32_t &Result) const;
146 error_code getSize(uint64_t &Result) const;
147 error_code getType(SymbolRef::Type &Result) const;
149 /// @brief Get section this symbol is defined in reference to. Result is
150 /// end_sections() if it is undefined or is an absolute symbol.
151 error_code getSection(section_iterator &Result) const;
153 /// @brief Get value of the symbol in the symbol table.
154 error_code getValue(uint64_t &Val) const;
156 const ObjectFile *getObject() const;
159 class symbol_iterator : public basic_symbol_iterator {
161 symbol_iterator(SymbolRef Sym) : basic_symbol_iterator(Sym) {}
162 symbol_iterator(const basic_symbol_iterator &B)
163 : basic_symbol_iterator(SymbolRef(B->getRawDataRefImpl(),
164 cast<ObjectFile>(B->getObject()))) {}
166 const SymbolRef *operator->() const {
167 const BasicSymbolRef &P = basic_symbol_iterator::operator *();
168 return static_cast<const SymbolRef*>(&P);
171 const SymbolRef &operator*() const {
172 const BasicSymbolRef &P = basic_symbol_iterator::operator *();
173 return static_cast<const SymbolRef&>(P);
177 /// LibraryRef - This is a value type class that represents a single library in
178 /// the list of libraries needed by a shared or dynamic object.
180 friend class SectionRef;
181 DataRefImpl LibraryPimpl;
182 const ObjectFile *OwningObject;
185 LibraryRef() : OwningObject(NULL) { }
187 LibraryRef(DataRefImpl LibraryP, const ObjectFile *Owner);
189 bool operator==(const LibraryRef &Other) const;
190 bool operator<(const LibraryRef &Other) const;
192 error_code getNext(LibraryRef &Result) const;
194 // Get the path to this library, as stored in the object file.
195 error_code getPath(StringRef &Result) const;
197 DataRefImpl getRawDataRefImpl() const;
199 typedef content_iterator<LibraryRef> library_iterator;
201 /// ObjectFile - This class is the base class for all object file types.
202 /// Concrete instances of this object are created by createObjectFile, which
203 /// figures out which type to create.
204 class ObjectFile : public SymbolicFile {
205 virtual void anchor();
206 ObjectFile() LLVM_DELETED_FUNCTION;
207 ObjectFile(const ObjectFile &other) LLVM_DELETED_FUNCTION;
210 ObjectFile(unsigned int Type, MemoryBuffer *Source, bool BufferOwned = true);
212 const uint8_t *base() const {
213 return reinterpret_cast<const uint8_t *>(Data->getBufferStart());
216 // These functions are for SymbolRef to call internally. The main goal of
217 // this is to allow SymbolRef::SymbolPimpl to point directly to the symbol
218 // entry in the memory mapped object file. SymbolPimpl cannot contain any
219 // virtual functions because then it could not point into the memory mapped
222 // Implementations assume that the DataRefImpl is valid and has not been
223 // modified externally. It's UB otherwise.
224 friend class SymbolRef;
225 virtual error_code getSymbolName(DataRefImpl Symb, StringRef &Res) const = 0;
226 error_code printSymbolName(raw_ostream &OS, DataRefImpl Symb) const override;
227 virtual error_code getSymbolAddress(DataRefImpl Symb, uint64_t &Res) const = 0;
228 virtual error_code getSymbolFileOffset(DataRefImpl Symb, uint64_t &Res)const=0;
229 virtual error_code getSymbolAlignment(DataRefImpl Symb, uint32_t &Res) const;
230 virtual error_code getSymbolSize(DataRefImpl Symb, uint64_t &Res) const = 0;
231 virtual error_code getSymbolType(DataRefImpl Symb,
232 SymbolRef::Type &Res) const = 0;
233 virtual error_code getSymbolSection(DataRefImpl Symb,
234 section_iterator &Res) const = 0;
235 virtual error_code getSymbolValue(DataRefImpl Symb, uint64_t &Val) const = 0;
237 // Same as above for SectionRef.
238 friend class SectionRef;
239 virtual void moveSectionNext(DataRefImpl &Sec) const = 0;
240 virtual error_code getSectionName(DataRefImpl Sec, StringRef &Res) const = 0;
241 virtual error_code getSectionAddress(DataRefImpl Sec, uint64_t &Res) const =0;
242 virtual error_code getSectionSize(DataRefImpl Sec, uint64_t &Res) const = 0;
243 virtual error_code getSectionContents(DataRefImpl Sec, StringRef &Res)const=0;
244 virtual error_code getSectionAlignment(DataRefImpl Sec, uint64_t &Res)const=0;
245 virtual error_code isSectionText(DataRefImpl Sec, bool &Res) const = 0;
246 virtual error_code isSectionData(DataRefImpl Sec, bool &Res) const = 0;
247 virtual error_code isSectionBSS(DataRefImpl Sec, bool &Res) const = 0;
248 virtual error_code isSectionRequiredForExecution(DataRefImpl Sec,
249 bool &Res) const = 0;
250 // A section is 'virtual' if its contents aren't present in the object image.
251 virtual error_code isSectionVirtual(DataRefImpl Sec, bool &Res) const = 0;
252 virtual error_code isSectionZeroInit(DataRefImpl Sec, bool &Res) const = 0;
253 virtual error_code isSectionReadOnlyData(DataRefImpl Sec, bool &Res) const =0;
254 virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
255 bool &Result) const = 0;
256 virtual relocation_iterator section_rel_begin(DataRefImpl Sec) const = 0;
257 virtual relocation_iterator section_rel_end(DataRefImpl Sec) const = 0;
258 virtual section_iterator getRelocatedSection(DataRefImpl Sec) const;
260 // Same as above for RelocationRef.
261 friend class RelocationRef;
262 virtual void moveRelocationNext(DataRefImpl &Rel) const = 0;
263 virtual error_code getRelocationAddress(DataRefImpl Rel,
264 uint64_t &Res) const =0;
265 virtual error_code getRelocationOffset(DataRefImpl Rel,
266 uint64_t &Res) const =0;
267 virtual symbol_iterator getRelocationSymbol(DataRefImpl Rel) const = 0;
268 virtual error_code getRelocationType(DataRefImpl Rel,
269 uint64_t &Res) const = 0;
270 virtual error_code getRelocationTypeName(DataRefImpl Rel,
271 SmallVectorImpl<char> &Result) const = 0;
272 virtual error_code getRelocationValueString(DataRefImpl Rel,
273 SmallVectorImpl<char> &Result) const = 0;
274 virtual error_code getRelocationHidden(DataRefImpl Rel, bool &Result) const {
276 return object_error::success;
279 // Same for LibraryRef
280 friend class LibraryRef;
281 virtual error_code getLibraryNext(DataRefImpl Lib, LibraryRef &Res) const = 0;
282 virtual error_code getLibraryPath(DataRefImpl Lib, StringRef &Res) const = 0;
286 symbol_iterator begin_symbols() const;
287 symbol_iterator end_symbols() const;
289 virtual section_iterator section_begin() const = 0;
290 virtual section_iterator section_end() const = 0;
292 typedef iterator_range<section_iterator> section_iterator_range;
293 section_iterator_range sections() const {
294 return section_iterator_range(section_begin(), section_end());
297 virtual library_iterator needed_library_begin() const = 0;
298 virtual library_iterator needed_library_end() const = 0;
300 /// @brief The number of bytes used to represent an address in this object
302 virtual uint8_t getBytesInAddress() const = 0;
304 virtual StringRef getFileFormatName() const = 0;
305 virtual /* Triple::ArchType */ unsigned getArch() const = 0;
307 /// For shared objects, returns the name which this object should be
308 /// loaded from at runtime. This corresponds to DT_SONAME on ELF and
309 /// LC_ID_DYLIB (install name) on MachO.
310 virtual StringRef getLoadName() const = 0;
312 /// @returns Pointer to ObjectFile subclass to handle this type of object.
313 /// @param ObjectPath The path to the object file. ObjectPath.isObject must
315 /// @brief Create ObjectFile from path.
316 static ErrorOr<ObjectFile *> createObjectFile(StringRef ObjectPath);
317 static ErrorOr<ObjectFile *> createObjectFile(MemoryBuffer *Object,
319 sys::fs::file_magic Type);
320 static ErrorOr<ObjectFile *> createObjectFile(MemoryBuffer *Object) {
321 return createObjectFile(Object, true, sys::fs::file_magic::unknown);
325 static inline bool classof(const Binary *v) {
326 return v->isObject();
330 static ErrorOr<ObjectFile *> createCOFFObjectFile(MemoryBuffer *Object,
331 bool BufferOwned = true);
332 static ErrorOr<ObjectFile *> createELFObjectFile(MemoryBuffer *Object,
333 bool BufferOwned = true);
334 static ErrorOr<ObjectFile *> createMachOObjectFile(MemoryBuffer *Object,
335 bool BufferOwned = true);
338 // Inline function definitions.
339 inline SymbolRef::SymbolRef(DataRefImpl SymbolP, const ObjectFile *Owner)
340 : BasicSymbolRef(SymbolP, Owner) {}
342 inline symbol_iterator ObjectFile::begin_symbols() const {
343 basic_symbol_iterator I = symbol_begin_impl();
344 const BasicSymbolRef &Ref = *I;
345 const SymbolRef &Cast = static_cast<const SymbolRef&>(Ref);
346 return symbol_iterator(Cast);
349 inline symbol_iterator ObjectFile::end_symbols() const {
350 basic_symbol_iterator I = symbol_end_impl();
351 const BasicSymbolRef &Ref = *I;
352 const SymbolRef &Cast = static_cast<const SymbolRef&>(Ref);
353 return symbol_iterator(Cast);
356 inline error_code SymbolRef::getName(StringRef &Result) const {
357 return getObject()->getSymbolName(getRawDataRefImpl(), Result);
360 inline error_code SymbolRef::getAddress(uint64_t &Result) const {
361 return getObject()->getSymbolAddress(getRawDataRefImpl(), Result);
364 inline error_code SymbolRef::getFileOffset(uint64_t &Result) const {
365 return getObject()->getSymbolFileOffset(getRawDataRefImpl(), Result);
368 inline error_code SymbolRef::getAlignment(uint32_t &Result) const {
369 return getObject()->getSymbolAlignment(getRawDataRefImpl(), Result);
372 inline error_code SymbolRef::getSize(uint64_t &Result) const {
373 return getObject()->getSymbolSize(getRawDataRefImpl(), Result);
376 inline error_code SymbolRef::getSection(section_iterator &Result) const {
377 return getObject()->getSymbolSection(getRawDataRefImpl(), Result);
380 inline error_code SymbolRef::getType(SymbolRef::Type &Result) const {
381 return getObject()->getSymbolType(getRawDataRefImpl(), Result);
384 inline error_code SymbolRef::getValue(uint64_t &Val) const {
385 return getObject()->getSymbolValue(getRawDataRefImpl(), Val);
388 inline const ObjectFile *SymbolRef::getObject() const {
389 const SymbolicFile *O = BasicSymbolRef::getObject();
390 return cast<ObjectFile>(O);
395 inline SectionRef::SectionRef(DataRefImpl SectionP,
396 const ObjectFile *Owner)
397 : SectionPimpl(SectionP)
398 , OwningObject(Owner) {}
400 inline bool SectionRef::operator==(const SectionRef &Other) const {
401 return SectionPimpl == Other.SectionPimpl;
404 inline bool SectionRef::operator<(const SectionRef &Other) const {
405 return SectionPimpl < Other.SectionPimpl;
408 inline void SectionRef::moveNext() {
409 return OwningObject->moveSectionNext(SectionPimpl);
412 inline error_code SectionRef::getName(StringRef &Result) const {
413 return OwningObject->getSectionName(SectionPimpl, Result);
416 inline error_code SectionRef::getAddress(uint64_t &Result) const {
417 return OwningObject->getSectionAddress(SectionPimpl, Result);
420 inline error_code SectionRef::getSize(uint64_t &Result) const {
421 return OwningObject->getSectionSize(SectionPimpl, Result);
424 inline error_code SectionRef::getContents(StringRef &Result) const {
425 return OwningObject->getSectionContents(SectionPimpl, Result);
428 inline error_code SectionRef::getAlignment(uint64_t &Result) const {
429 return OwningObject->getSectionAlignment(SectionPimpl, Result);
432 inline error_code SectionRef::isText(bool &Result) const {
433 return OwningObject->isSectionText(SectionPimpl, Result);
436 inline error_code SectionRef::isData(bool &Result) const {
437 return OwningObject->isSectionData(SectionPimpl, Result);
440 inline error_code SectionRef::isBSS(bool &Result) const {
441 return OwningObject->isSectionBSS(SectionPimpl, Result);
444 inline error_code SectionRef::isRequiredForExecution(bool &Result) const {
445 return OwningObject->isSectionRequiredForExecution(SectionPimpl, Result);
448 inline error_code SectionRef::isVirtual(bool &Result) const {
449 return OwningObject->isSectionVirtual(SectionPimpl, Result);
452 inline error_code SectionRef::isZeroInit(bool &Result) const {
453 return OwningObject->isSectionZeroInit(SectionPimpl, Result);
456 inline error_code SectionRef::isReadOnlyData(bool &Result) const {
457 return OwningObject->isSectionReadOnlyData(SectionPimpl, Result);
460 inline error_code SectionRef::containsSymbol(SymbolRef S, bool &Result) const {
461 return OwningObject->sectionContainsSymbol(SectionPimpl,
462 S.getRawDataRefImpl(), Result);
465 inline relocation_iterator SectionRef::relocation_begin() const {
466 return OwningObject->section_rel_begin(SectionPimpl);
469 inline relocation_iterator SectionRef::relocation_end() const {
470 return OwningObject->section_rel_end(SectionPimpl);
473 inline section_iterator SectionRef::getRelocatedSection() const {
474 return OwningObject->getRelocatedSection(SectionPimpl);
477 inline DataRefImpl SectionRef::getRawDataRefImpl() const {
482 inline RelocationRef::RelocationRef(DataRefImpl RelocationP,
483 const ObjectFile *Owner)
484 : RelocationPimpl(RelocationP)
485 , OwningObject(Owner) {}
487 inline bool RelocationRef::operator==(const RelocationRef &Other) const {
488 return RelocationPimpl == Other.RelocationPimpl;
491 inline void RelocationRef::moveNext() {
492 return OwningObject->moveRelocationNext(RelocationPimpl);
495 inline error_code RelocationRef::getAddress(uint64_t &Result) const {
496 return OwningObject->getRelocationAddress(RelocationPimpl, Result);
499 inline error_code RelocationRef::getOffset(uint64_t &Result) const {
500 return OwningObject->getRelocationOffset(RelocationPimpl, Result);
503 inline symbol_iterator RelocationRef::getSymbol() const {
504 return OwningObject->getRelocationSymbol(RelocationPimpl);
507 inline error_code RelocationRef::getType(uint64_t &Result) const {
508 return OwningObject->getRelocationType(RelocationPimpl, Result);
511 inline error_code RelocationRef::getTypeName(SmallVectorImpl<char> &Result)
513 return OwningObject->getRelocationTypeName(RelocationPimpl, Result);
516 inline error_code RelocationRef::getValueString(SmallVectorImpl<char> &Result)
518 return OwningObject->getRelocationValueString(RelocationPimpl, Result);
521 inline error_code RelocationRef::getHidden(bool &Result) const {
522 return OwningObject->getRelocationHidden(RelocationPimpl, Result);
525 inline DataRefImpl RelocationRef::getRawDataRefImpl() const {
526 return RelocationPimpl;
529 inline const ObjectFile *RelocationRef::getObjectFile() const {
533 // Inline function definitions.
534 inline LibraryRef::LibraryRef(DataRefImpl LibraryP, const ObjectFile *Owner)
535 : LibraryPimpl(LibraryP)
536 , OwningObject(Owner) {}
538 inline bool LibraryRef::operator==(const LibraryRef &Other) const {
539 return LibraryPimpl == Other.LibraryPimpl;
542 inline bool LibraryRef::operator<(const LibraryRef &Other) const {
543 return LibraryPimpl < Other.LibraryPimpl;
546 inline error_code LibraryRef::getNext(LibraryRef &Result) const {
547 return OwningObject->getLibraryNext(LibraryPimpl, Result);
550 inline error_code LibraryRef::getPath(StringRef &Result) const {
551 return OwningObject->getLibraryPath(LibraryPimpl, Result);
554 } // end namespace object
555 } // end namespace llvm