1 //===- MachO.h - MachO object file implementation ---------------*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file declares the MachOObjectFile class, which implement the ObjectFile
11 // interface for MachO files.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #ifndef LLVM_OBJECT_MACHO_H
16 #define LLVM_OBJECT_MACHO_H
17
18 #include "llvm/ADT/ArrayRef.h"
19 #include "llvm/ADT/SmallVector.h"
20 #include "llvm/ADT/Triple.h"
21 #include "llvm/Object/ObjectFile.h"
22 #include "llvm/Support/MachO.h"
23
24 namespace llvm {
25 namespace object {
26
27 /// DiceRef - This is a value type class that represents a single
28 /// data in code entry in the table in a Mach-O object file.
29 class DiceRef {
30 DataRefImpl DicePimpl;
31 const ObjectFile *OwningObject;
32
33 public:
DiceRef()34 DiceRef() : OwningObject(NULL) { }
35
36 DiceRef(DataRefImpl DiceP, const ObjectFile *Owner);
37
38 bool operator==(const DiceRef &Other) const;
39 bool operator<(const DiceRef &Other) const;
40
41 error_code getNext(DiceRef &Result) const;
42
43 error_code getOffset(uint32_t &Result) const;
44 error_code getLength(uint16_t &Result) const;
45 error_code getKind(uint16_t &Result) const;
46
47 DataRefImpl getRawDataRefImpl() const;
48 const ObjectFile *getObjectFile() const;
49 };
50 typedef content_iterator<DiceRef> dice_iterator;
51
52 class MachOObjectFile : public ObjectFile {
53 public:
54 struct LoadCommandInfo {
55 const char *Ptr; // Where in memory the load command is.
56 MachO::load_command C; // The command itself.
57 };
58
59 MachOObjectFile(MemoryBuffer *Object, bool IsLittleEndian, bool Is64Bits,
60 error_code &ec);
61
62 virtual error_code getSymbolNext(DataRefImpl Symb, SymbolRef &Res) const;
63 virtual error_code getSymbolName(DataRefImpl Symb, StringRef &Res) const;
64 virtual error_code getSymbolAddress(DataRefImpl Symb, uint64_t &Res) const;
65 virtual error_code getSymbolFileOffset(DataRefImpl Symb, uint64_t &Res) const;
66 virtual error_code getSymbolAlignment(DataRefImpl Symb, uint32_t &Res) const;
67 virtual error_code getSymbolSize(DataRefImpl Symb, uint64_t &Res) const;
68 virtual error_code getSymbolType(DataRefImpl Symb,
69 SymbolRef::Type &Res) const;
70 virtual error_code getSymbolFlags(DataRefImpl Symb, uint32_t &Res) const;
71 virtual error_code getSymbolSection(DataRefImpl Symb,
72 section_iterator &Res) const;
73 virtual error_code getSymbolValue(DataRefImpl Symb, uint64_t &Val) const;
74
75 virtual error_code getSectionNext(DataRefImpl Sec, SectionRef &Res) const;
76 virtual error_code getSectionName(DataRefImpl Sec, StringRef &Res) const;
77 virtual error_code getSectionAddress(DataRefImpl Sec, uint64_t &Res) const;
78 virtual error_code getSectionSize(DataRefImpl Sec, uint64_t &Res) const;
79 virtual error_code getSectionContents(DataRefImpl Sec, StringRef &Res) const;
80 virtual error_code getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const;
81 virtual error_code isSectionText(DataRefImpl Sec, bool &Res) const;
82 virtual error_code isSectionData(DataRefImpl Sec, bool &Res) const;
83 virtual error_code isSectionBSS(DataRefImpl Sec, bool &Res) const;
84 virtual error_code isSectionRequiredForExecution(DataRefImpl Sec,
85 bool &Res) const;
86 virtual error_code isSectionVirtual(DataRefImpl Sec, bool &Res) const;
87 virtual error_code isSectionZeroInit(DataRefImpl Sec, bool &Res) const;
88 virtual error_code isSectionReadOnlyData(DataRefImpl Sec, bool &Res) const;
89 virtual error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
90 bool &Result) const;
91 virtual relocation_iterator section_rel_begin(DataRefImpl Sec) const;
92 virtual relocation_iterator section_rel_end(DataRefImpl Sec) const;
93
94 virtual error_code getRelocationNext(DataRefImpl Rel,
95 RelocationRef &Res) const;
96 virtual error_code getRelocationAddress(DataRefImpl Rel, uint64_t &Res) const;
97 virtual error_code getRelocationOffset(DataRefImpl Rel, uint64_t &Res) const;
98 virtual symbol_iterator getRelocationSymbol(DataRefImpl Rel) const;
99 virtual error_code getRelocationType(DataRefImpl Rel, uint64_t &Res) const;
100 virtual error_code getRelocationTypeName(DataRefImpl Rel,
101 SmallVectorImpl<char> &Result) const;
102 virtual error_code getRelocationValueString(DataRefImpl Rel,
103 SmallVectorImpl<char> &Result) const;
104 virtual error_code getRelocationHidden(DataRefImpl Rel, bool &Result) const;
105
106 virtual error_code getLibraryNext(DataRefImpl LibData, LibraryRef &Res) const;
107 virtual error_code getLibraryPath(DataRefImpl LibData, StringRef &Res) const;
108
109 // TODO: Would be useful to have an iterator based version
110 // of the load command interface too.
111
112 virtual symbol_iterator begin_symbols() const;
113 virtual symbol_iterator end_symbols() const;
114
115 virtual symbol_iterator begin_dynamic_symbols() const;
116 virtual symbol_iterator end_dynamic_symbols() const;
117
118 virtual section_iterator begin_sections() const;
119 virtual section_iterator end_sections() const;
120
121 virtual library_iterator begin_libraries_needed() const;
122 virtual library_iterator end_libraries_needed() const;
123
124 virtual uint8_t getBytesInAddress() const;
125
126 virtual StringRef getFileFormatName() const;
127 virtual unsigned getArch() const;
128
129 virtual StringRef getLoadName() const;
130
131 relocation_iterator section_rel_begin(unsigned Index) const;
132 relocation_iterator section_rel_end(unsigned Index) const;
133
134 dice_iterator begin_dices() const;
135 dice_iterator end_dices() const;
136
137 // In a MachO file, sections have a segment name. This is used in the .o
138 // files. They have a single segment, but this field specifies which segment
139 // a section should be put in in the final object.
140 StringRef getSectionFinalSegmentName(DataRefImpl Sec) const;
141
142 // Names are stored as 16 bytes. These returns the raw 16 bytes without
143 // interpreting them as a C string.
144 ArrayRef<char> getSectionRawName(DataRefImpl Sec) const;
145 ArrayRef<char> getSectionRawFinalSegmentName(DataRefImpl Sec) const;
146
147 // MachO specific Info about relocations.
148 bool isRelocationScattered(const MachO::any_relocation_info &RE) const;
149 unsigned getPlainRelocationSymbolNum(
150 const MachO::any_relocation_info &RE) const;
151 bool getPlainRelocationExternal(const MachO::any_relocation_info &RE) const;
152 bool getScatteredRelocationScattered(
153 const MachO::any_relocation_info &RE) const;
154 uint32_t getScatteredRelocationValue(
155 const MachO::any_relocation_info &RE) const;
156 unsigned getAnyRelocationAddress(const MachO::any_relocation_info &RE) const;
157 unsigned getAnyRelocationPCRel(const MachO::any_relocation_info &RE) const;
158 unsigned getAnyRelocationLength(const MachO::any_relocation_info &RE) const;
159 unsigned getAnyRelocationType(const MachO::any_relocation_info &RE) const;
160 SectionRef getRelocationSection(const MachO::any_relocation_info &RE) const;
161
162 // Walk load commands.
163 LoadCommandInfo getFirstLoadCommandInfo() const;
164 LoadCommandInfo getNextLoadCommandInfo(const LoadCommandInfo &L) const;
165
166 // MachO specific structures.
167 MachO::section getSection(DataRefImpl DRI) const;
168 MachO::section_64 getSection64(DataRefImpl DRI) const;
169 MachO::section getSection(const LoadCommandInfo &L, unsigned Index) const;
170 MachO::section_64 getSection64(const LoadCommandInfo &L,unsigned Index) const;
171 MachO::nlist getSymbolTableEntry(DataRefImpl DRI) const;
172 MachO::nlist_64 getSymbol64TableEntry(DataRefImpl DRI) const;
173
174 MachO::linkedit_data_command
175 getLinkeditDataLoadCommand(const LoadCommandInfo &L) const;
176 MachO::segment_command
177 getSegmentLoadCommand(const LoadCommandInfo &L) const;
178 MachO::segment_command_64
179 getSegment64LoadCommand(const LoadCommandInfo &L) const;
180 MachO::linker_options_command
181 getLinkerOptionsLoadCommand(const LoadCommandInfo &L) const;
182
183 MachO::any_relocation_info getRelocation(DataRefImpl Rel) const;
184 MachO::data_in_code_entry getDice(DataRefImpl Rel) const;
185 MachO::mach_header getHeader() const;
186 MachO::mach_header_64 getHeader64() const;
187 uint32_t
188 getIndirectSymbolTableEntry(const MachO::dysymtab_command &DLC,
189 unsigned Index) const;
190 MachO::data_in_code_entry getDataInCodeTableEntry(uint32_t DataOffset,
191 unsigned Index) const;
192 MachO::symtab_command getSymtabLoadCommand() const;
193 MachO::dysymtab_command getDysymtabLoadCommand() const;
194 MachO::linkedit_data_command getDataInCodeLoadCommand() const;
195
196 StringRef getStringTableData() const;
197 bool is64Bit() const;
198 void ReadULEB128s(uint64_t Index, SmallVectorImpl<uint64_t> &Out) const;
199
200 static Triple::ArchType getArch(uint32_t CPUType);
201
classof(const Binary * v)202 static bool classof(const Binary *v) {
203 return v->isMachO();
204 }
205
206 private:
207 typedef SmallVector<const char*, 1> SectionList;
208 SectionList Sections;
209 const char *SymtabLoadCmd;
210 const char *DysymtabLoadCmd;
211 const char *DataInCodeLoadCmd;
212 };
213
214 /// DiceRef
DiceRef(DataRefImpl DiceP,const ObjectFile * Owner)215 inline DiceRef::DiceRef(DataRefImpl DiceP, const ObjectFile *Owner)
216 : DicePimpl(DiceP) , OwningObject(Owner) {}
217
218 inline bool DiceRef::operator==(const DiceRef &Other) const {
219 return DicePimpl == Other.DicePimpl;
220 }
221
222 inline bool DiceRef::operator<(const DiceRef &Other) const {
223 return DicePimpl < Other.DicePimpl;
224 }
225
getNext(DiceRef & Result)226 inline error_code DiceRef::getNext(DiceRef &Result) const {
227 DataRefImpl Rel = DicePimpl;
228 const MachO::data_in_code_entry *P =
229 reinterpret_cast<const MachO::data_in_code_entry *>(Rel.p);
230 Rel.p = reinterpret_cast<uintptr_t>(P + 1);
231 Result = DiceRef(Rel, OwningObject);
232 return object_error::success;
233 }
234
235 // Since a Mach-O data in code reference, a DiceRef, can only be created when
236 // the OwningObject ObjectFile is a MachOObjectFile a static_cast<> is used for
237 // the methods that get the values of the fields of the reference.
238
getOffset(uint32_t & Result)239 inline error_code DiceRef::getOffset(uint32_t &Result) const {
240 const MachOObjectFile *MachOOF =
241 static_cast<const MachOObjectFile *>(OwningObject);
242 MachO::data_in_code_entry Dice = MachOOF->getDice(DicePimpl);
243 Result = Dice.offset;
244 return object_error::success;
245 }
246
getLength(uint16_t & Result)247 inline error_code DiceRef::getLength(uint16_t &Result) const {
248 const MachOObjectFile *MachOOF =
249 static_cast<const MachOObjectFile *>(OwningObject);
250 MachO::data_in_code_entry Dice = MachOOF->getDice(DicePimpl);
251 Result = Dice.length;
252 return object_error::success;
253 }
254
getKind(uint16_t & Result)255 inline error_code DiceRef::getKind(uint16_t &Result) const {
256 const MachOObjectFile *MachOOF =
257 static_cast<const MachOObjectFile *>(OwningObject);
258 MachO::data_in_code_entry Dice = MachOOF->getDice(DicePimpl);
259 Result = Dice.kind;
260 return object_error::success;
261 }
262
getRawDataRefImpl()263 inline DataRefImpl DiceRef::getRawDataRefImpl() const {
264 return DicePimpl;
265 }
266
getObjectFile()267 inline const ObjectFile *DiceRef::getObjectFile() const {
268 return OwningObject;
269 }
270
271 }
272 }
273
274 #endif
275
276