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"
36 static bool operator ==(const DataRefImpl &a, const DataRefImpl &b) {
37 // Check bitwise identical. This is the only legal way to compare a union w/o
38 // knowing which member is in use.
39 return std::memcmp(&a, &b, sizeof(DataRefImpl)) == 0;
42 /// SymbolRef - This is a value type class that represents a single symbol in
43 /// the list of symbols in the object file.
45 friend class SectionRef;
46 DataRefImpl SymbolPimpl;
47 const ObjectFile *OwningObject;
50 SymbolRef() : OwningObject(NULL) {
51 std::memset(&SymbolPimpl, 0, sizeof(SymbolPimpl));
54 SymbolRef(DataRefImpl SymbolP, const ObjectFile *Owner);
56 bool operator==(const SymbolRef &Other) const;
58 error_code getNext(SymbolRef &Result) const;
60 error_code getName(StringRef &Result) const;
61 error_code getAddress(uint64_t &Result) const;
62 error_code getSize(uint64_t &Result) const;
64 /// Returns the ascii char that should be displayed in a symbol table dump via
65 /// nm for this symbol.
66 error_code getNMTypeChar(char &Result) const;
68 /// Returns true for symbols that are internal to the object file format such
69 /// as section symbols.
70 error_code isInternal(bool &Result) const;
73 /// RelocationRef - This is a value type class that represents a single
74 /// relocation in the list of relocations in the object file.
76 DataRefImpl RelocationPimpl;
77 const ObjectFile *OwningObject;
80 RelocationRef() : OwningObject(NULL) {
81 std::memset(&RelocationPimpl, 0, sizeof(RelocationPimpl));
84 RelocationRef(DataRefImpl RelocationP, const ObjectFile *Owner);
86 bool operator==(const RelocationRef &Other) const;
88 error_code getNext(RelocationRef &Result) const;
90 error_code getAddress(uint64_t &Result) const;
91 error_code getSymbol(SymbolRef &Result) const;
92 error_code getType(uint32_t &Result) const;
93 error_code getAdditionalInfo(int64_t &Result) const;
96 /// SectionRef - This is a value type class that represents a single section in
97 /// the list of sections in the object file.
99 friend class SymbolRef;
100 DataRefImpl SectionPimpl;
101 const ObjectFile *OwningObject;
104 SectionRef() : OwningObject(NULL) {
105 std::memset(&SectionPimpl, 0, sizeof(SectionPimpl));
108 SectionRef(DataRefImpl SectionP, const ObjectFile *Owner);
110 bool operator==(const SectionRef &Other) const;
112 error_code getNext(SectionRef &Result) const;
114 error_code getName(StringRef &Result) const;
115 error_code getAddress(uint64_t &Result) const;
116 error_code getSize(uint64_t &Result) const;
117 error_code getContents(StringRef &Result) const;
119 // FIXME: Move to the normalization layer when it's created.
120 error_code isText(bool &Result) const;
122 error_code containsSymbol(SymbolRef S, bool &Result) const;
125 const uint64_t UnknownAddressOrSize = ~0ULL;
127 /// ObjectFile - This class is the base class for all object file types.
128 /// Concrete instances of this object are created by createObjectFile, which
129 /// figure out which type to create.
130 class ObjectFile : public Binary {
132 ObjectFile(); // = delete
133 ObjectFile(const ObjectFile &other); // = delete
136 ObjectFile(unsigned int Type, MemoryBuffer *source, error_code &ec);
138 const uint8_t *base() const {
139 return reinterpret_cast<const uint8_t *>(Data->getBufferStart());
142 // These functions are for SymbolRef to call internally. The main goal of
143 // this is to allow SymbolRef::SymbolPimpl to point directly to the symbol
144 // entry in the memory mapped object file. SymbolPimpl cannot contain any
145 // virtual functions because then it could not point into the memory mapped
148 // Implementations assume that the DataRefImpl is valid and has not been
149 // modified externally. It's UB otherwise.
150 friend class SymbolRef;
151 virtual error_code getSymbolNext(DataRefImpl Symb, SymbolRef &Res) const = 0;
152 virtual error_code getSymbolName(DataRefImpl Symb, StringRef &Res) const = 0;
153 virtual error_code getSymbolAddress(DataRefImpl Symb, uint64_t &Res) const =0;
154 virtual error_code getSymbolSize(DataRefImpl Symb, uint64_t &Res) const = 0;
155 virtual error_code getSymbolNMTypeChar(DataRefImpl Symb, char &Res) const = 0;
156 virtual error_code isSymbolInternal(DataRefImpl Symb, bool &Res) const = 0;
158 // Same as above for SectionRef.
159 friend class SectionRef;
160 virtual error_code getSectionNext(DataRefImpl Sec, SectionRef &Res) const = 0;
161 virtual error_code getSectionName(DataRefImpl Sec, StringRef &Res) const = 0;
162 virtual error_code getSectionAddress(DataRefImpl Sec, uint64_t &Res) const =0;
163 virtual error_code getSectionSize(DataRefImpl Sec, uint64_t &Res) const = 0;
164 virtual error_code getSectionContents(DataRefImpl Sec, StringRef &Res)const=0;
165 virtual error_code isSectionText(DataRefImpl Sec, bool &Res) const = 0;
166 virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
167 bool &Result) const = 0;
170 // Same as above for RelocationRef.
171 friend class RelocationRef;
172 virtual error_code getRelocationNext(DataRefImpl Rel,
173 RelocationRef &Res) const = 0;
174 virtual error_code getRelocationAddress(DataRefImpl Rel,
175 uint64_t &Res) const =0;
176 virtual error_code getRelocationSymbol(DataRefImpl Rel,
177 SymbolRef &Res) const = 0;
178 virtual error_code getRelocationType(DataRefImpl Rel,
179 uint32_t &Res) const = 0;
180 virtual error_code getRelocationAdditionalInfo(DataRefImpl Rel,
181 int64_t &Res) const = 0;
184 template<class content_type>
185 class content_iterator {
186 content_type Current;
188 content_iterator(content_type symb)
191 const content_type* operator->() const {
195 const content_type &operator*() const {
199 bool operator==(const content_iterator &other) const {
200 return Current == other.Current;
203 bool operator!=(const content_iterator &other) const {
204 return !(*this == other);
207 content_iterator& increment(error_code &err) {
209 if (error_code ec = Current.getNext(next))
217 typedef content_iterator<SymbolRef> symbol_iterator;
218 typedef content_iterator<SectionRef> section_iterator;
219 typedef content_iterator<RelocationRef> relocation_iterator;
221 virtual symbol_iterator begin_symbols() const = 0;
222 virtual symbol_iterator end_symbols() const = 0;
224 virtual section_iterator begin_sections() const = 0;
225 virtual section_iterator end_sections() const = 0;
227 virtual relocation_iterator begin_relocations() const = 0;
228 virtual relocation_iterator end_relocations() const = 0;
230 /// @brief The number of bytes used to represent an address in this object
232 virtual uint8_t getBytesInAddress() const = 0;
234 virtual StringRef getFileFormatName() const = 0;
235 virtual /* Triple::ArchType */ unsigned getArch() const = 0;
237 /// @returns Pointer to ObjectFile subclass to handle this type of object.
238 /// @param ObjectPath The path to the object file. ObjectPath.isObject must
240 /// @brief Create ObjectFile from path.
241 static ObjectFile *createObjectFile(StringRef ObjectPath);
242 static ObjectFile *createObjectFile(MemoryBuffer *Object);
244 static inline bool classof(const Binary *v) {
245 return v->getType() >= isObject &&
246 v->getType() < lastObject;
248 static inline bool classof(const ObjectFile *v) { return true; }
251 static ObjectFile *createCOFFObjectFile(MemoryBuffer *Object);
252 static ObjectFile *createELFObjectFile(MemoryBuffer *Object);
253 static ObjectFile *createMachOObjectFile(MemoryBuffer *Object);
256 // Inline function definitions.
257 inline SymbolRef::SymbolRef(DataRefImpl SymbolP, const ObjectFile *Owner)
258 : SymbolPimpl(SymbolP)
259 , OwningObject(Owner) {}
261 inline bool SymbolRef::operator==(const SymbolRef &Other) const {
262 return SymbolPimpl == Other.SymbolPimpl;
265 inline error_code SymbolRef::getNext(SymbolRef &Result) const {
266 return OwningObject->getSymbolNext(SymbolPimpl, Result);
269 inline error_code SymbolRef::getName(StringRef &Result) const {
270 return OwningObject->getSymbolName(SymbolPimpl, Result);
273 inline error_code SymbolRef::getAddress(uint64_t &Result) const {
274 return OwningObject->getSymbolAddress(SymbolPimpl, Result);
277 inline error_code SymbolRef::getSize(uint64_t &Result) const {
278 return OwningObject->getSymbolSize(SymbolPimpl, Result);
281 inline error_code SymbolRef::getNMTypeChar(char &Result) const {
282 return OwningObject->getSymbolNMTypeChar(SymbolPimpl, Result);
285 inline error_code SymbolRef::isInternal(bool &Result) const {
286 return OwningObject->isSymbolInternal(SymbolPimpl, Result);
291 inline SectionRef::SectionRef(DataRefImpl SectionP,
292 const ObjectFile *Owner)
293 : SectionPimpl(SectionP)
294 , OwningObject(Owner) {}
296 inline bool SectionRef::operator==(const SectionRef &Other) const {
297 return SectionPimpl == Other.SectionPimpl;
300 inline error_code SectionRef::getNext(SectionRef &Result) const {
301 return OwningObject->getSectionNext(SectionPimpl, Result);
304 inline error_code SectionRef::getName(StringRef &Result) const {
305 return OwningObject->getSectionName(SectionPimpl, Result);
308 inline error_code SectionRef::getAddress(uint64_t &Result) const {
309 return OwningObject->getSectionAddress(SectionPimpl, Result);
312 inline error_code SectionRef::getSize(uint64_t &Result) const {
313 return OwningObject->getSectionSize(SectionPimpl, Result);
316 inline error_code SectionRef::getContents(StringRef &Result) const {
317 return OwningObject->getSectionContents(SectionPimpl, Result);
320 inline error_code SectionRef::isText(bool &Result) const {
321 return OwningObject->isSectionText(SectionPimpl, Result);
324 inline error_code SectionRef::containsSymbol(SymbolRef S, bool &Result) const {
325 return OwningObject->sectionContainsSymbol(SectionPimpl, S.SymbolPimpl,
331 inline RelocationRef::RelocationRef(DataRefImpl RelocationP,
332 const ObjectFile *Owner)
333 : RelocationPimpl(RelocationP)
334 , OwningObject(Owner) {}
336 inline bool RelocationRef::operator==(const RelocationRef &Other) const {
337 return RelocationPimpl == Other.RelocationPimpl;
340 inline error_code RelocationRef::getNext(RelocationRef &Result) const {
341 return OwningObject->getRelocationNext(RelocationPimpl, Result);
344 inline error_code RelocationRef::getAddress(uint64_t &Result) const {
345 return OwningObject->getRelocationAddress(RelocationPimpl, Result);
348 inline error_code RelocationRef::getSymbol(SymbolRef &Result) const {
349 return OwningObject->getRelocationSymbol(RelocationPimpl, Result);
352 inline error_code RelocationRef::getType(uint32_t &Result) const {
353 return OwningObject->getRelocationType(RelocationPimpl, Result);
356 inline error_code RelocationRef::getAdditionalInfo(int64_t &Result) const {
357 return OwningObject->getRelocationAdditionalInfo(RelocationPimpl, Result);
360 } // end namespace object
361 } // end namespace llvm