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"
31 class MachOObjectFile;
34 class symbol_iterator;
36 typedef content_iterator<SectionRef> section_iterator;
38 /// RelocationRef - This is a value type class that represents a single
39 /// relocation in the list of relocations in the object file.
41 DataRefImpl RelocationPimpl;
42 const ObjectFile *OwningObject;
45 RelocationRef() : OwningObject(nullptr) { }
47 RelocationRef(DataRefImpl RelocationP, const ObjectFile *Owner);
49 bool operator==(const RelocationRef &Other) const;
53 std::error_code getAddress(uint64_t &Result) const;
54 std::error_code getOffset(uint64_t &Result) const;
55 symbol_iterator getSymbol() const;
56 section_iterator getSection() const;
57 std::error_code getType(uint64_t &Result) const;
59 /// @brief Indicates whether this relocation should hidden when listing
60 /// relocations, usually because it is the trailing part of a multipart
61 /// relocation that will be printed as part of the leading relocation.
62 std::error_code getHidden(bool &Result) const;
64 /// @brief Get a string that represents the type of this relocation.
66 /// This is for display purposes only.
67 std::error_code getTypeName(SmallVectorImpl<char> &Result) const;
69 /// @brief Get a string that represents the calculation of the value of this
72 /// This is for display purposes only.
73 std::error_code getValueString(SmallVectorImpl<char> &Result) const;
75 DataRefImpl getRawDataRefImpl() const;
76 const ObjectFile *getObjectFile() const;
78 typedef content_iterator<RelocationRef> relocation_iterator;
80 /// SectionRef - This is a value type class that represents a single section in
81 /// the list of sections in the object file.
83 friend class SymbolRef;
84 DataRefImpl SectionPimpl;
85 const ObjectFile *OwningObject;
88 SectionRef() : OwningObject(nullptr) { }
90 SectionRef(DataRefImpl SectionP, const ObjectFile *Owner);
92 bool operator==(const SectionRef &Other) const;
93 bool operator!=(const SectionRef &Other) const;
94 bool operator<(const SectionRef &Other) const;
98 std::error_code getName(StringRef &Result) const;
99 uint64_t getAddress() const;
100 uint64_t getSize() const;
101 std::error_code getContents(StringRef &Result) const;
103 /// @brief Get the alignment of this section as the actual value (not log 2).
104 uint64_t getAlignment() const;
109 bool isVirtual() const;
111 bool containsSymbol(SymbolRef S) const;
113 relocation_iterator relocation_begin() const;
114 relocation_iterator relocation_end() const;
115 iterator_range<relocation_iterator> relocations() const {
116 return iterator_range<relocation_iterator>(relocation_begin(),
119 section_iterator getRelocatedSection() const;
121 DataRefImpl getRawDataRefImpl() const;
122 const ObjectFile *getObject() const;
125 /// SymbolRef - This is a value type class that represents a single symbol in
126 /// the list of symbols in the object file.
127 class SymbolRef : public BasicSymbolRef {
128 friend class SectionRef;
131 SymbolRef() : BasicSymbolRef() {}
134 ST_Unknown, // Type not specified
142 SymbolRef(DataRefImpl SymbolP, const ObjectFile *Owner);
144 std::error_code getName(StringRef &Result) const;
145 /// Returns the symbol virtual address (i.e. address at which it will be
147 std::error_code getAddress(uint64_t &Result) const;
148 /// @brief Get the alignment of this symbol as the actual value (not log 2).
149 std::error_code getAlignment(uint32_t &Result) const;
150 std::error_code getSize(uint64_t &Result) const;
151 std::error_code getType(SymbolRef::Type &Result) const;
152 std::error_code getOther(uint8_t &Result) const;
154 /// @brief Get section this symbol is defined in reference to. Result is
155 /// end_sections() if it is undefined or is an absolute symbol.
156 std::error_code getSection(section_iterator &Result) const;
158 const ObjectFile *getObject() const;
161 class symbol_iterator : public basic_symbol_iterator {
163 symbol_iterator(SymbolRef Sym) : basic_symbol_iterator(Sym) {}
164 symbol_iterator(const basic_symbol_iterator &B)
165 : basic_symbol_iterator(SymbolRef(B->getRawDataRefImpl(),
166 cast<ObjectFile>(B->getObject()))) {}
168 const SymbolRef *operator->() const {
169 const BasicSymbolRef &P = basic_symbol_iterator::operator *();
170 return static_cast<const SymbolRef*>(&P);
173 const SymbolRef &operator*() const {
174 const BasicSymbolRef &P = basic_symbol_iterator::operator *();
175 return static_cast<const SymbolRef&>(P);
179 /// ObjectFile - This class is the base class for all object file types.
180 /// Concrete instances of this object are created by createObjectFile, which
181 /// figures out which type to create.
182 class ObjectFile : public SymbolicFile {
183 virtual void anchor();
184 ObjectFile() = delete;
185 ObjectFile(const ObjectFile &other) = delete;
188 ObjectFile(unsigned int Type, MemoryBufferRef Source);
190 const uint8_t *base() const {
191 return reinterpret_cast<const uint8_t *>(Data.getBufferStart());
194 // These functions are for SymbolRef to call internally. The main goal of
195 // this is to allow SymbolRef::SymbolPimpl to point directly to the symbol
196 // entry in the memory mapped object file. SymbolPimpl cannot contain any
197 // virtual functions because then it could not point into the memory mapped
200 // Implementations assume that the DataRefImpl is valid and has not been
201 // modified externally. It's UB otherwise.
202 friend class SymbolRef;
203 virtual std::error_code getSymbolName(DataRefImpl Symb,
204 StringRef &Res) const = 0;
205 std::error_code printSymbolName(raw_ostream &OS,
206 DataRefImpl Symb) const override;
207 virtual std::error_code getSymbolAddress(DataRefImpl Symb,
208 uint64_t &Res) const = 0;
209 virtual std::error_code getSymbolAlignment(DataRefImpl Symb,
210 uint32_t &Res) const;
211 virtual std::error_code getSymbolSize(DataRefImpl Symb,
212 uint64_t &Res) const = 0;
213 virtual std::error_code getSymbolType(DataRefImpl Symb,
214 SymbolRef::Type &Res) const = 0;
215 virtual std::error_code getSymbolSection(DataRefImpl Symb,
216 section_iterator &Res) const = 0;
217 virtual std::error_code getSymbolOther(DataRefImpl Symb,
218 uint8_t &Res) const {
219 return object_error::invalid_file_type;
222 // Same as above for SectionRef.
223 friend class SectionRef;
224 virtual void moveSectionNext(DataRefImpl &Sec) const = 0;
225 virtual std::error_code getSectionName(DataRefImpl Sec,
226 StringRef &Res) const = 0;
227 virtual uint64_t getSectionAddress(DataRefImpl Sec) const = 0;
228 virtual uint64_t getSectionSize(DataRefImpl Sec) const = 0;
229 virtual std::error_code getSectionContents(DataRefImpl Sec,
230 StringRef &Res) const = 0;
231 virtual uint64_t getSectionAlignment(DataRefImpl Sec) const = 0;
232 virtual bool isSectionText(DataRefImpl Sec) const = 0;
233 virtual bool isSectionData(DataRefImpl Sec) const = 0;
234 virtual bool isSectionBSS(DataRefImpl Sec) const = 0;
235 // A section is 'virtual' if its contents aren't present in the object image.
236 virtual bool isSectionVirtual(DataRefImpl Sec) const = 0;
237 virtual bool sectionContainsSymbol(DataRefImpl Sec,
238 DataRefImpl Symb) const = 0;
239 virtual relocation_iterator section_rel_begin(DataRefImpl Sec) const = 0;
240 virtual relocation_iterator section_rel_end(DataRefImpl Sec) const = 0;
241 virtual section_iterator getRelocatedSection(DataRefImpl Sec) const;
243 // Same as above for RelocationRef.
244 friend class RelocationRef;
245 virtual void moveRelocationNext(DataRefImpl &Rel) const = 0;
246 virtual std::error_code getRelocationAddress(DataRefImpl Rel,
247 uint64_t &Res) const = 0;
248 virtual std::error_code getRelocationOffset(DataRefImpl Rel,
249 uint64_t &Res) const = 0;
250 virtual symbol_iterator getRelocationSymbol(DataRefImpl Rel) const = 0;
251 virtual section_iterator getRelocationSection(DataRefImpl Rel) const = 0;
252 virtual std::error_code getRelocationType(DataRefImpl Rel,
253 uint64_t &Res) const = 0;
254 virtual std::error_code
255 getRelocationTypeName(DataRefImpl Rel,
256 SmallVectorImpl<char> &Result) const = 0;
257 virtual std::error_code
258 getRelocationValueString(DataRefImpl Rel,
259 SmallVectorImpl<char> &Result) const = 0;
260 virtual std::error_code getRelocationHidden(DataRefImpl Rel,
261 bool &Result) const {
263 return object_error::success;
267 typedef iterator_range<symbol_iterator> symbol_iterator_range;
268 symbol_iterator_range symbols() const {
269 return symbol_iterator_range(symbol_begin(), symbol_end());
272 virtual section_iterator section_begin() const = 0;
273 virtual section_iterator section_end() const = 0;
275 typedef iterator_range<section_iterator> section_iterator_range;
276 section_iterator_range sections() const {
277 return section_iterator_range(section_begin(), section_end());
280 /// @brief The number of bytes used to represent an address in this object
282 virtual uint8_t getBytesInAddress() const = 0;
284 virtual StringRef getFileFormatName() const = 0;
285 virtual /* Triple::ArchType */ unsigned getArch() const = 0;
287 /// Returns platform-specific object flags, if any.
288 virtual std::error_code getPlatformFlags(unsigned &Result) const {
290 return object_error::invalid_file_type;
293 /// True if this is a relocatable object (.o/.obj).
294 virtual bool isRelocatableObject() const = 0;
296 /// @returns Pointer to ObjectFile subclass to handle this type of object.
297 /// @param ObjectPath The path to the object file. ObjectPath.isObject must
299 /// @brief Create ObjectFile from path.
300 static ErrorOr<OwningBinary<ObjectFile>>
301 createObjectFile(StringRef ObjectPath);
303 static ErrorOr<std::unique_ptr<ObjectFile>>
304 createObjectFile(MemoryBufferRef Object, sys::fs::file_magic Type);
305 static ErrorOr<std::unique_ptr<ObjectFile>>
306 createObjectFile(MemoryBufferRef Object) {
307 return createObjectFile(Object, sys::fs::file_magic::unknown);
311 static inline bool classof(const Binary *v) {
312 return v->isObject();
315 static ErrorOr<std::unique_ptr<COFFObjectFile>>
316 createCOFFObjectFile(MemoryBufferRef Object);
318 static ErrorOr<std::unique_ptr<ObjectFile>>
319 createELFObjectFile(MemoryBufferRef Object);
321 static ErrorOr<std::unique_ptr<MachOObjectFile>>
322 createMachOObjectFile(MemoryBufferRef Object);
325 // Inline function definitions.
326 inline SymbolRef::SymbolRef(DataRefImpl SymbolP, const ObjectFile *Owner)
327 : BasicSymbolRef(SymbolP, Owner) {}
329 inline std::error_code SymbolRef::getName(StringRef &Result) const {
330 return getObject()->getSymbolName(getRawDataRefImpl(), Result);
333 inline std::error_code SymbolRef::getAddress(uint64_t &Result) const {
334 return getObject()->getSymbolAddress(getRawDataRefImpl(), Result);
337 inline std::error_code SymbolRef::getAlignment(uint32_t &Result) const {
338 return getObject()->getSymbolAlignment(getRawDataRefImpl(), Result);
341 inline std::error_code SymbolRef::getSize(uint64_t &Result) const {
342 return getObject()->getSymbolSize(getRawDataRefImpl(), Result);
345 inline std::error_code SymbolRef::getSection(section_iterator &Result) const {
346 return getObject()->getSymbolSection(getRawDataRefImpl(), Result);
349 inline std::error_code SymbolRef::getType(SymbolRef::Type &Result) const {
350 return getObject()->getSymbolType(getRawDataRefImpl(), Result);
353 inline std::error_code SymbolRef::getOther(uint8_t &Result) const {
354 return getObject()->getSymbolOther(getRawDataRefImpl(), Result);
357 inline const ObjectFile *SymbolRef::getObject() const {
358 const SymbolicFile *O = BasicSymbolRef::getObject();
359 return cast<ObjectFile>(O);
364 inline SectionRef::SectionRef(DataRefImpl SectionP,
365 const ObjectFile *Owner)
366 : SectionPimpl(SectionP)
367 , OwningObject(Owner) {}
369 inline bool SectionRef::operator==(const SectionRef &Other) const {
370 return SectionPimpl == Other.SectionPimpl;
373 inline bool SectionRef::operator!=(const SectionRef &Other) const {
374 return SectionPimpl != Other.SectionPimpl;
377 inline bool SectionRef::operator<(const SectionRef &Other) const {
378 return SectionPimpl < Other.SectionPimpl;
381 inline void SectionRef::moveNext() {
382 return OwningObject->moveSectionNext(SectionPimpl);
385 inline std::error_code SectionRef::getName(StringRef &Result) const {
386 return OwningObject->getSectionName(SectionPimpl, Result);
389 inline uint64_t SectionRef::getAddress() const {
390 return OwningObject->getSectionAddress(SectionPimpl);
393 inline uint64_t SectionRef::getSize() const {
394 return OwningObject->getSectionSize(SectionPimpl);
397 inline std::error_code SectionRef::getContents(StringRef &Result) const {
398 return OwningObject->getSectionContents(SectionPimpl, Result);
401 inline uint64_t SectionRef::getAlignment() const {
402 return OwningObject->getSectionAlignment(SectionPimpl);
405 inline bool SectionRef::isText() const {
406 return OwningObject->isSectionText(SectionPimpl);
409 inline bool SectionRef::isData() const {
410 return OwningObject->isSectionData(SectionPimpl);
413 inline bool SectionRef::isBSS() const {
414 return OwningObject->isSectionBSS(SectionPimpl);
417 inline bool SectionRef::isVirtual() const {
418 return OwningObject->isSectionVirtual(SectionPimpl);
421 inline bool SectionRef::containsSymbol(SymbolRef S) const {
422 return OwningObject->sectionContainsSymbol(SectionPimpl,
423 S.getRawDataRefImpl());
426 inline relocation_iterator SectionRef::relocation_begin() const {
427 return OwningObject->section_rel_begin(SectionPimpl);
430 inline relocation_iterator SectionRef::relocation_end() const {
431 return OwningObject->section_rel_end(SectionPimpl);
434 inline section_iterator SectionRef::getRelocatedSection() const {
435 return OwningObject->getRelocatedSection(SectionPimpl);
438 inline DataRefImpl SectionRef::getRawDataRefImpl() const {
442 inline const ObjectFile *SectionRef::getObject() const {
447 inline RelocationRef::RelocationRef(DataRefImpl RelocationP,
448 const ObjectFile *Owner)
449 : RelocationPimpl(RelocationP)
450 , OwningObject(Owner) {}
452 inline bool RelocationRef::operator==(const RelocationRef &Other) const {
453 return RelocationPimpl == Other.RelocationPimpl;
456 inline void RelocationRef::moveNext() {
457 return OwningObject->moveRelocationNext(RelocationPimpl);
460 inline std::error_code RelocationRef::getAddress(uint64_t &Result) const {
461 return OwningObject->getRelocationAddress(RelocationPimpl, Result);
464 inline std::error_code RelocationRef::getOffset(uint64_t &Result) const {
465 return OwningObject->getRelocationOffset(RelocationPimpl, Result);
468 inline symbol_iterator RelocationRef::getSymbol() const {
469 return OwningObject->getRelocationSymbol(RelocationPimpl);
472 inline section_iterator RelocationRef::getSection() const {
473 return OwningObject->getRelocationSection(RelocationPimpl);
476 inline std::error_code RelocationRef::getType(uint64_t &Result) const {
477 return OwningObject->getRelocationType(RelocationPimpl, Result);
480 inline std::error_code
481 RelocationRef::getTypeName(SmallVectorImpl<char> &Result) const {
482 return OwningObject->getRelocationTypeName(RelocationPimpl, Result);
485 inline std::error_code
486 RelocationRef::getValueString(SmallVectorImpl<char> &Result) const {
487 return OwningObject->getRelocationValueString(RelocationPimpl, Result);
490 inline std::error_code RelocationRef::getHidden(bool &Result) const {
491 return OwningObject->getRelocationHidden(RelocationPimpl, Result);
494 inline DataRefImpl RelocationRef::getRawDataRefImpl() const {
495 return RelocationPimpl;
498 inline const ObjectFile *RelocationRef::getObjectFile() const {
503 } // end namespace object
504 } // end namespace llvm