1 //===- ObjectFile.cpp - 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 defines a file format independent ObjectFile class.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Object/ObjectFile.h"
15 #include "llvm/Object/COFF.h"
16 #include "llvm/Object/MachO.h"
17 #include "llvm/Object/Wasm.h"
18 #include "llvm/Support/ErrorHandling.h"
19 #include "llvm/Support/FileSystem.h"
20 #include "llvm/Support/MemoryBuffer.h"
21 #include "llvm/Support/raw_ostream.h"
22 #include <system_error>
25 using namespace object;
27 void ObjectFile::anchor() { }
29 ObjectFile::ObjectFile(unsigned int Type, MemoryBufferRef Source)
30 : SymbolicFile(Type, Source) {}
32 bool SectionRef::containsSymbol(SymbolRef S) const {
33 Expected<section_iterator> SymSec = S.getSection();
35 // TODO: Actually report errors helpfully.
36 consumeError(SymSec.takeError());
39 return *this == **SymSec;
42 uint64_t ObjectFile::getSymbolValue(DataRefImpl Ref) const {
43 uint32_t Flags = getSymbolFlags(Ref);
44 if (Flags & SymbolRef::SF_Undefined)
46 if (Flags & SymbolRef::SF_Common)
47 return getCommonSymbolSize(Ref);
48 return getSymbolValueImpl(Ref);
51 std::error_code ObjectFile::printSymbolName(raw_ostream &OS,
52 DataRefImpl Symb) const {
53 Expected<StringRef> Name = getSymbolName(Symb);
55 return errorToErrorCode(Name.takeError());
57 return std::error_code();
60 uint32_t ObjectFile::getSymbolAlignment(DataRefImpl DRI) const { return 0; }
62 bool ObjectFile::isSectionBitcode(DataRefImpl Sec) const {
64 if (!getSectionName(Sec, SectName))
65 return SectName == ".llvmbc";
69 section_iterator ObjectFile::getRelocatedSection(DataRefImpl Sec) const {
70 return section_iterator(SectionRef(Sec, this));
73 Expected<std::unique_ptr<ObjectFile>>
74 ObjectFile::createObjectFile(MemoryBufferRef Object, sys::fs::file_magic Type) {
75 StringRef Data = Object.getBuffer();
76 if (Type == sys::fs::file_magic::unknown)
77 Type = sys::fs::identify_magic(Data);
80 case sys::fs::file_magic::unknown:
81 case sys::fs::file_magic::bitcode:
82 case sys::fs::file_magic::coff_cl_gl_object:
83 case sys::fs::file_magic::archive:
84 case sys::fs::file_magic::macho_universal_binary:
85 case sys::fs::file_magic::windows_resource:
86 return errorCodeToError(object_error::invalid_file_type);
87 case sys::fs::file_magic::elf:
88 case sys::fs::file_magic::elf_relocatable:
89 case sys::fs::file_magic::elf_executable:
90 case sys::fs::file_magic::elf_shared_object:
91 case sys::fs::file_magic::elf_core:
92 return errorOrToExpected(createELFObjectFile(Object));
93 case sys::fs::file_magic::macho_object:
94 case sys::fs::file_magic::macho_executable:
95 case sys::fs::file_magic::macho_fixed_virtual_memory_shared_lib:
96 case sys::fs::file_magic::macho_core:
97 case sys::fs::file_magic::macho_preload_executable:
98 case sys::fs::file_magic::macho_dynamically_linked_shared_lib:
99 case sys::fs::file_magic::macho_dynamic_linker:
100 case sys::fs::file_magic::macho_bundle:
101 case sys::fs::file_magic::macho_dynamically_linked_shared_lib_stub:
102 case sys::fs::file_magic::macho_dsym_companion:
103 case sys::fs::file_magic::macho_kext_bundle:
104 return createMachOObjectFile(Object);
105 case sys::fs::file_magic::coff_object:
106 case sys::fs::file_magic::coff_import_library:
107 case sys::fs::file_magic::pecoff_executable:
108 return errorOrToExpected(createCOFFObjectFile(Object));
109 case sys::fs::file_magic::wasm_object:
110 return createWasmObjectFile(Object);
112 llvm_unreachable("Unexpected Object File Type");
115 Expected<OwningBinary<ObjectFile>>
116 ObjectFile::createObjectFile(StringRef ObjectPath) {
117 ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
118 MemoryBuffer::getFile(ObjectPath);
119 if (std::error_code EC = FileOrErr.getError())
120 return errorCodeToError(EC);
121 std::unique_ptr<MemoryBuffer> Buffer = std::move(FileOrErr.get());
123 Expected<std::unique_ptr<ObjectFile>> ObjOrErr =
124 createObjectFile(Buffer->getMemBufferRef());
125 if (Error Err = ObjOrErr.takeError())
126 return std::move(Err);
127 std::unique_ptr<ObjectFile> Obj = std::move(ObjOrErr.get());
129 return OwningBinary<ObjectFile>(std::move(Obj), std::move(Buffer));