1 //===- ObjectFile.cpp - File format independent object file ---------------===//
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 defines a file format independent ObjectFile class.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Object/ObjectFile.h"
15 #include "llvm/ADT/StringRef.h"
16 #include "llvm/BinaryFormat/Magic.h"
17 #include "llvm/Object/Binary.h"
18 #include "llvm/Object/COFF.h"
19 #include "llvm/Object/Error.h"
20 #include "llvm/Object/MachO.h"
21 #include "llvm/Object/Wasm.h"
22 #include "llvm/Support/Error.h"
23 #include "llvm/Support/ErrorHandling.h"
24 #include "llvm/Support/ErrorOr.h"
25 #include "llvm/Support/FileSystem.h"
26 #include "llvm/Support/MemoryBuffer.h"
27 #include "llvm/Support/raw_ostream.h"
31 #include <system_error>
34 using namespace object;
36 void ObjectFile::anchor() {}
38 ObjectFile::ObjectFile(unsigned int Type, MemoryBufferRef Source)
39 : SymbolicFile(Type, Source) {}
41 bool SectionRef::containsSymbol(SymbolRef S) const {
42 Expected<section_iterator> SymSec = S.getSection();
44 // TODO: Actually report errors helpfully.
45 consumeError(SymSec.takeError());
48 return *this == **SymSec;
51 uint64_t ObjectFile::getSymbolValue(DataRefImpl Ref) const {
52 uint32_t Flags = getSymbolFlags(Ref);
53 if (Flags & SymbolRef::SF_Undefined)
55 if (Flags & SymbolRef::SF_Common)
56 return getCommonSymbolSize(Ref);
57 return getSymbolValueImpl(Ref);
60 std::error_code ObjectFile::printSymbolName(raw_ostream &OS,
61 DataRefImpl Symb) const {
62 Expected<StringRef> Name = getSymbolName(Symb);
64 return errorToErrorCode(Name.takeError());
66 return std::error_code();
69 uint32_t ObjectFile::getSymbolAlignment(DataRefImpl DRI) const { return 0; }
71 bool ObjectFile::isSectionBitcode(DataRefImpl Sec) const {
73 if (!getSectionName(Sec, SectName))
74 return SectName == ".llvmbc";
78 bool ObjectFile::isSectionStripped(DataRefImpl Sec) const { return false; }
80 section_iterator ObjectFile::getRelocatedSection(DataRefImpl Sec) const {
81 return section_iterator(SectionRef(Sec, this));
84 Triple ObjectFile::makeTriple() const {
86 auto Arch = getArch();
87 TheTriple.setArch(Triple::ArchType(Arch));
89 // For ARM targets, try to use the build attributes to build determine
90 // the build target. Target features are also added, but later during
92 if (Arch == Triple::arm || Arch == Triple::armeb)
93 setARMSubArch(TheTriple);
95 // TheTriple defaults to ELF, and COFF doesn't have an environment:
96 // the best we can do here is indicate that it is mach-o.
98 TheTriple.setObjectFormat(Triple::MachO);
101 const auto COFFObj = dyn_cast<COFFObjectFile>(this);
102 if (COFFObj->getArch() == Triple::thumb)
103 TheTriple.setTriple("thumbv7-windows");
109 Expected<std::unique_ptr<ObjectFile>>
110 ObjectFile::createObjectFile(MemoryBufferRef Object, file_magic Type) {
111 StringRef Data = Object.getBuffer();
112 if (Type == file_magic::unknown)
113 Type = identify_magic(Data);
116 case file_magic::unknown:
117 case file_magic::bitcode:
118 case file_magic::coff_cl_gl_object:
119 case file_magic::archive:
120 case file_magic::macho_universal_binary:
121 case file_magic::windows_resource:
122 return errorCodeToError(object_error::invalid_file_type);
123 case file_magic::elf:
124 case file_magic::elf_relocatable:
125 case file_magic::elf_executable:
126 case file_magic::elf_shared_object:
127 case file_magic::elf_core:
128 return createELFObjectFile(Object);
129 case file_magic::macho_object:
130 case file_magic::macho_executable:
131 case file_magic::macho_fixed_virtual_memory_shared_lib:
132 case file_magic::macho_core:
133 case file_magic::macho_preload_executable:
134 case file_magic::macho_dynamically_linked_shared_lib:
135 case file_magic::macho_dynamic_linker:
136 case file_magic::macho_bundle:
137 case file_magic::macho_dynamically_linked_shared_lib_stub:
138 case file_magic::macho_dsym_companion:
139 case file_magic::macho_kext_bundle:
140 return createMachOObjectFile(Object);
141 case file_magic::coff_object:
142 case file_magic::coff_import_library:
143 case file_magic::pecoff_executable:
144 return createCOFFObjectFile(Object);
145 case file_magic::wasm_object:
146 return createWasmObjectFile(Object);
148 llvm_unreachable("Unexpected Object File Type");
151 Expected<OwningBinary<ObjectFile>>
152 ObjectFile::createObjectFile(StringRef ObjectPath) {
153 ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
154 MemoryBuffer::getFile(ObjectPath);
155 if (std::error_code EC = FileOrErr.getError())
156 return errorCodeToError(EC);
157 std::unique_ptr<MemoryBuffer> Buffer = std::move(FileOrErr.get());
159 Expected<std::unique_ptr<ObjectFile>> ObjOrErr =
160 createObjectFile(Buffer->getMemBufferRef());
161 if (Error Err = ObjOrErr.takeError())
162 return std::move(Err);
163 std::unique_ptr<ObjectFile> Obj = std::move(ObjOrErr.get());
165 return OwningBinary<ObjectFile>(std::move(Obj), std::move(Buffer));