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"
31 // ELF needs this for relocations. This entire union should probably be a
32 // char[max(8, sizeof(uintptr_t))] and require the impl to cast.
42 template<class content_type>
43 class content_iterator {
46 content_iterator(content_type symb)
49 const content_type* operator->() const {
53 const content_type &operator*() const {
57 bool operator==(const content_iterator &other) const {
58 return Current == other.Current;
61 bool operator!=(const content_iterator &other) const {
62 return !(*this == other);
65 content_iterator& increment(error_code &err) {
67 if (error_code ec = Current.getNext(next))
75 static bool operator ==(const DataRefImpl &a, const DataRefImpl &b) {
76 // Check bitwise identical. This is the only legal way to compare a union w/o
77 // knowing which member is in use.
78 return std::memcmp(&a, &b, sizeof(DataRefImpl)) == 0;
81 /// SymbolRef - This is a value type class that represents a single symbol in
82 /// the list of symbols in the object file.
84 friend class SectionRef;
85 DataRefImpl SymbolPimpl;
86 const ObjectFile *OwningObject;
89 SymbolRef() : OwningObject(NULL) {
90 std::memset(&SymbolPimpl, 0, sizeof(SymbolPimpl));
96 ST_External, // Defined in another object file
100 SymbolRef(DataRefImpl SymbolP, const ObjectFile *Owner);
102 bool operator==(const SymbolRef &Other) const;
104 error_code getNext(SymbolRef &Result) const;
106 error_code getName(StringRef &Result) const;
107 error_code getAddress(uint64_t &Result) const;
108 error_code getOffset(uint64_t &Result) const;
109 error_code getSize(uint64_t &Result) const;
110 error_code getType(SymbolRef::Type &Result) const;
112 /// Returns the ascii char that should be displayed in a symbol table dump via
113 /// nm for this symbol.
114 error_code getNMTypeChar(char &Result) const;
116 /// Returns true for symbols that are internal to the object file format such
117 /// as section symbols.
118 error_code isInternal(bool &Result) const;
120 /// Returns true for symbols that can be used in another objects,
121 /// such as library functions
122 error_code isGlobal(bool &Result) const;
124 DataRefImpl getRawDataRefImpl() const;
126 typedef content_iterator<SymbolRef> symbol_iterator;
128 /// RelocationRef - This is a value type class that represents a single
129 /// relocation in the list of relocations in the object file.
130 class RelocationRef {
131 DataRefImpl RelocationPimpl;
132 const ObjectFile *OwningObject;
135 RelocationRef() : OwningObject(NULL) {
136 std::memset(&RelocationPimpl, 0, sizeof(RelocationPimpl));
139 RelocationRef(DataRefImpl RelocationP, const ObjectFile *Owner);
141 bool operator==(const RelocationRef &Other) const;
143 error_code getNext(RelocationRef &Result) const;
145 error_code getAddress(uint64_t &Result) const;
146 error_code getSymbol(SymbolRef &Result) const;
147 error_code getType(uint32_t &Result) const;
149 /// @brief Get a string that represents the type of this relocation.
151 /// This is for display purposes only.
152 error_code getTypeName(SmallVectorImpl<char> &Result) const;
153 error_code getAdditionalInfo(int64_t &Result) const;
155 /// @brief Get a string that represents the calculation of the value of this
158 /// This is for display purposes only.
159 error_code getValueString(SmallVectorImpl<char> &Result) const;
161 typedef content_iterator<RelocationRef> relocation_iterator;
163 /// SectionRef - This is a value type class that represents a single section in
164 /// the list of sections in the object file.
166 friend class SymbolRef;
167 DataRefImpl SectionPimpl;
168 const ObjectFile *OwningObject;
171 SectionRef() : OwningObject(NULL) {
172 std::memset(&SectionPimpl, 0, sizeof(SectionPimpl));
175 SectionRef(DataRefImpl SectionP, const ObjectFile *Owner);
177 bool operator==(const SectionRef &Other) const;
179 error_code getNext(SectionRef &Result) const;
181 error_code getName(StringRef &Result) const;
182 error_code getAddress(uint64_t &Result) const;
183 error_code getSize(uint64_t &Result) const;
184 error_code getContents(StringRef &Result) const;
186 /// @brief Get the alignment of this section as the actual value (not log 2).
187 error_code getAlignment(uint64_t &Result) const;
189 // FIXME: Move to the normalization layer when it's created.
190 error_code isText(bool &Result) const;
191 error_code isData(bool &Result) const;
192 error_code isBSS(bool &Result) const;
194 error_code containsSymbol(SymbolRef S, bool &Result) const;
196 relocation_iterator begin_relocations() const;
197 relocation_iterator end_relocations() const;
199 typedef content_iterator<SectionRef> section_iterator;
201 const uint64_t UnknownAddressOrSize = ~0ULL;
203 /// ObjectFile - This class is the base class for all object file types.
204 /// Concrete instances of this object are created by createObjectFile, which
205 /// figure out which type to create.
206 class ObjectFile : public Binary {
208 ObjectFile(); // = delete
209 ObjectFile(const ObjectFile &other); // = delete
212 ObjectFile(unsigned int Type, MemoryBuffer *source, error_code &ec);
214 const uint8_t *base() const {
215 return reinterpret_cast<const uint8_t *>(Data->getBufferStart());
218 // These functions are for SymbolRef to call internally. The main goal of
219 // this is to allow SymbolRef::SymbolPimpl to point directly to the symbol
220 // entry in the memory mapped object file. SymbolPimpl cannot contain any
221 // virtual functions because then it could not point into the memory mapped
224 // Implementations assume that the DataRefImpl is valid and has not been
225 // modified externally. It's UB otherwise.
226 friend class SymbolRef;
227 virtual error_code getSymbolNext(DataRefImpl Symb, SymbolRef &Res) const = 0;
228 virtual error_code getSymbolName(DataRefImpl Symb, StringRef &Res) const = 0;
229 virtual error_code getSymbolAddress(DataRefImpl Symb, uint64_t &Res) const =0;
230 virtual error_code getSymbolOffset(DataRefImpl Symb, uint64_t &Res) const =0;
231 virtual error_code getSymbolSize(DataRefImpl Symb, uint64_t &Res) const = 0;
232 virtual error_code getSymbolType(DataRefImpl Symb,
233 SymbolRef::Type &Res) const = 0;
234 virtual error_code getSymbolNMTypeChar(DataRefImpl Symb, char &Res) const = 0;
235 virtual error_code isSymbolInternal(DataRefImpl Symb, bool &Res) const = 0;
236 virtual error_code isSymbolGlobal(DataRefImpl Symb, bool &Res) const = 0;
239 // Same as above for SectionRef.
240 friend class SectionRef;
241 virtual error_code getSectionNext(DataRefImpl Sec, SectionRef &Res) const = 0;
242 virtual error_code getSectionName(DataRefImpl Sec, StringRef &Res) const = 0;
243 virtual error_code getSectionAddress(DataRefImpl Sec, uint64_t &Res) const =0;
244 virtual error_code getSectionSize(DataRefImpl Sec, uint64_t &Res) const = 0;
245 virtual error_code getSectionContents(DataRefImpl Sec, StringRef &Res)const=0;
246 virtual error_code getSectionAlignment(DataRefImpl Sec, uint64_t &Res)const=0;
247 virtual error_code isSectionText(DataRefImpl Sec, bool &Res) const = 0;
248 virtual error_code isSectionData(DataRefImpl Sec, bool &Res) const = 0;
249 virtual error_code isSectionBSS(DataRefImpl Sec, bool &Res) const = 0;
250 virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
251 bool &Result) const = 0;
252 virtual relocation_iterator getSectionRelBegin(DataRefImpl Sec) const = 0;
253 virtual relocation_iterator getSectionRelEnd(DataRefImpl Sec) const = 0;
256 // Same as above for RelocationRef.
257 friend class RelocationRef;
258 virtual error_code getRelocationNext(DataRefImpl Rel,
259 RelocationRef &Res) const = 0;
260 virtual error_code getRelocationAddress(DataRefImpl Rel,
261 uint64_t &Res) const =0;
262 virtual error_code getRelocationSymbol(DataRefImpl Rel,
263 SymbolRef &Res) const = 0;
264 virtual error_code getRelocationType(DataRefImpl Rel,
265 uint32_t &Res) const = 0;
266 virtual error_code getRelocationTypeName(DataRefImpl Rel,
267 SmallVectorImpl<char> &Result) const = 0;
268 virtual error_code getRelocationAdditionalInfo(DataRefImpl Rel,
269 int64_t &Res) const = 0;
270 virtual error_code getRelocationValueString(DataRefImpl Rel,
271 SmallVectorImpl<char> &Result) const = 0;
275 virtual symbol_iterator begin_symbols() const = 0;
276 virtual symbol_iterator end_symbols() const = 0;
278 virtual section_iterator begin_sections() const = 0;
279 virtual section_iterator end_sections() const = 0;
281 /// @brief The number of bytes used to represent an address in this object
283 virtual uint8_t getBytesInAddress() const = 0;
285 virtual StringRef getFileFormatName() const = 0;
286 virtual /* Triple::ArchType */ unsigned getArch() const = 0;
288 /// @returns Pointer to ObjectFile subclass to handle this type of object.
289 /// @param ObjectPath The path to the object file. ObjectPath.isObject must
291 /// @brief Create ObjectFile from path.
292 static ObjectFile *createObjectFile(StringRef ObjectPath);
293 static ObjectFile *createObjectFile(MemoryBuffer *Object);
295 static inline bool classof(const Binary *v) {
296 return v->getType() >= isObject &&
297 v->getType() < lastObject;
299 static inline bool classof(const ObjectFile *v) { return true; }
302 static ObjectFile *createCOFFObjectFile(MemoryBuffer *Object);
303 static ObjectFile *createELFObjectFile(MemoryBuffer *Object);
304 static ObjectFile *createMachOObjectFile(MemoryBuffer *Object);
307 // Inline function definitions.
308 inline SymbolRef::SymbolRef(DataRefImpl SymbolP, const ObjectFile *Owner)
309 : SymbolPimpl(SymbolP)
310 , OwningObject(Owner) {}
312 inline bool SymbolRef::operator==(const SymbolRef &Other) const {
313 return SymbolPimpl == Other.SymbolPimpl;
316 inline error_code SymbolRef::getNext(SymbolRef &Result) const {
317 return OwningObject->getSymbolNext(SymbolPimpl, Result);
320 inline error_code SymbolRef::getName(StringRef &Result) const {
321 return OwningObject->getSymbolName(SymbolPimpl, Result);
324 inline error_code SymbolRef::getAddress(uint64_t &Result) const {
325 return OwningObject->getSymbolAddress(SymbolPimpl, Result);
328 inline error_code SymbolRef::getOffset(uint64_t &Result) const {
329 return OwningObject->getSymbolOffset(SymbolPimpl, Result);
332 inline error_code SymbolRef::getSize(uint64_t &Result) const {
333 return OwningObject->getSymbolSize(SymbolPimpl, Result);
336 inline error_code SymbolRef::getNMTypeChar(char &Result) const {
337 return OwningObject->getSymbolNMTypeChar(SymbolPimpl, Result);
340 inline error_code SymbolRef::isInternal(bool &Result) const {
341 return OwningObject->isSymbolInternal(SymbolPimpl, Result);
344 inline error_code SymbolRef::isGlobal(bool &Result) const {
345 return OwningObject->isSymbolGlobal(SymbolPimpl, Result);
348 inline error_code SymbolRef::getType(SymbolRef::Type &Result) const {
349 return OwningObject->getSymbolType(SymbolPimpl, Result);
352 inline DataRefImpl SymbolRef::getRawDataRefImpl() const {
358 inline SectionRef::SectionRef(DataRefImpl SectionP,
359 const ObjectFile *Owner)
360 : SectionPimpl(SectionP)
361 , OwningObject(Owner) {}
363 inline bool SectionRef::operator==(const SectionRef &Other) const {
364 return SectionPimpl == Other.SectionPimpl;
367 inline error_code SectionRef::getNext(SectionRef &Result) const {
368 return OwningObject->getSectionNext(SectionPimpl, Result);
371 inline error_code SectionRef::getName(StringRef &Result) const {
372 return OwningObject->getSectionName(SectionPimpl, Result);
375 inline error_code SectionRef::getAddress(uint64_t &Result) const {
376 return OwningObject->getSectionAddress(SectionPimpl, Result);
379 inline error_code SectionRef::getSize(uint64_t &Result) const {
380 return OwningObject->getSectionSize(SectionPimpl, Result);
383 inline error_code SectionRef::getContents(StringRef &Result) const {
384 return OwningObject->getSectionContents(SectionPimpl, Result);
387 inline error_code SectionRef::getAlignment(uint64_t &Result) const {
388 return OwningObject->getSectionAlignment(SectionPimpl, Result);
391 inline error_code SectionRef::isText(bool &Result) const {
392 return OwningObject->isSectionText(SectionPimpl, Result);
395 inline error_code SectionRef::isData(bool &Result) const {
396 return OwningObject->isSectionData(SectionPimpl, Result);
399 inline error_code SectionRef::isBSS(bool &Result) const {
400 return OwningObject->isSectionBSS(SectionPimpl, Result);
403 inline error_code SectionRef::containsSymbol(SymbolRef S, bool &Result) const {
404 return OwningObject->sectionContainsSymbol(SectionPimpl, S.SymbolPimpl,
408 inline relocation_iterator SectionRef::begin_relocations() const {
409 return OwningObject->getSectionRelBegin(SectionPimpl);
412 inline relocation_iterator SectionRef::end_relocations() const {
413 return OwningObject->getSectionRelEnd(SectionPimpl);
418 inline RelocationRef::RelocationRef(DataRefImpl RelocationP,
419 const ObjectFile *Owner)
420 : RelocationPimpl(RelocationP)
421 , OwningObject(Owner) {}
423 inline bool RelocationRef::operator==(const RelocationRef &Other) const {
424 return RelocationPimpl == Other.RelocationPimpl;
427 inline error_code RelocationRef::getNext(RelocationRef &Result) const {
428 return OwningObject->getRelocationNext(RelocationPimpl, Result);
431 inline error_code RelocationRef::getAddress(uint64_t &Result) const {
432 return OwningObject->getRelocationAddress(RelocationPimpl, Result);
435 inline error_code RelocationRef::getSymbol(SymbolRef &Result) const {
436 return OwningObject->getRelocationSymbol(RelocationPimpl, Result);
439 inline error_code RelocationRef::getType(uint32_t &Result) const {
440 return OwningObject->getRelocationType(RelocationPimpl, Result);
443 inline error_code RelocationRef::getTypeName(SmallVectorImpl<char> &Result)
445 return OwningObject->getRelocationTypeName(RelocationPimpl, Result);
448 inline error_code RelocationRef::getAdditionalInfo(int64_t &Result) const {
449 return OwningObject->getRelocationAdditionalInfo(RelocationPimpl, Result);
452 inline error_code RelocationRef::getValueString(SmallVectorImpl<char> &Result)
454 return OwningObject->getRelocationValueString(RelocationPimpl, Result);
457 } // end namespace object
458 } // end namespace llvm