1 //===- ObjectFile.cpp - File format independent object file -----*- 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 defines a file format independent ObjectFile class.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "llvm/Object/COFF.h"
15 #include "llvm/Object/MachO.h"
16 #include "llvm/Object/ObjectFile.h"
17 #include "llvm/Support/ErrorHandling.h"
18 #include "llvm/Support/FileSystem.h"
19 #include "llvm/Support/MemoryBuffer.h"
20 #include "llvm/Support/raw_ostream.h"
21 #include <system_error>
22
23 using namespace llvm;
24 using namespace object;
25
anchor()26 void ObjectFile::anchor() { }
27
ObjectFile(unsigned int Type,MemoryBufferRef Source)28 ObjectFile::ObjectFile(unsigned int Type, MemoryBufferRef Source)
29 : SymbolicFile(Type, Source) {}
30
containsSymbol(SymbolRef S) const31 bool SectionRef::containsSymbol(SymbolRef S) const {
32 Expected<section_iterator> SymSec = S.getSection();
33 if (!SymSec) {
34 // TODO: Actually report errors helpfully.
35 consumeError(SymSec.takeError());
36 return false;
37 }
38 return *this == **SymSec;
39 }
40
getSymbolValue(DataRefImpl Ref) const41 uint64_t ObjectFile::getSymbolValue(DataRefImpl Ref) const {
42 uint32_t Flags = getSymbolFlags(Ref);
43 if (Flags & SymbolRef::SF_Undefined)
44 return 0;
45 if (Flags & SymbolRef::SF_Common)
46 return getCommonSymbolSize(Ref);
47 return getSymbolValueImpl(Ref);
48 }
49
printSymbolName(raw_ostream & OS,DataRefImpl Symb) const50 std::error_code ObjectFile::printSymbolName(raw_ostream &OS,
51 DataRefImpl Symb) const {
52 Expected<StringRef> Name = getSymbolName(Symb);
53 if (!Name)
54 return errorToErrorCode(Name.takeError());
55 OS << *Name;
56 return std::error_code();
57 }
58
getSymbolAlignment(DataRefImpl DRI) const59 uint32_t ObjectFile::getSymbolAlignment(DataRefImpl DRI) const { return 0; }
60
isSectionBitcode(DataRefImpl Sec) const61 bool ObjectFile::isSectionBitcode(DataRefImpl Sec) const {
62 StringRef SectName;
63 if (!getSectionName(Sec, SectName))
64 return SectName == ".llvmbc";
65 return false;
66 }
67
getRelocatedSection(DataRefImpl Sec) const68 section_iterator ObjectFile::getRelocatedSection(DataRefImpl Sec) const {
69 return section_iterator(SectionRef(Sec, this));
70 }
71
72 Expected<std::unique_ptr<ObjectFile>>
createObjectFile(MemoryBufferRef Object,sys::fs::file_magic Type)73 ObjectFile::createObjectFile(MemoryBufferRef Object, sys::fs::file_magic Type) {
74 StringRef Data = Object.getBuffer();
75 if (Type == sys::fs::file_magic::unknown)
76 Type = sys::fs::identify_magic(Data);
77
78 switch (Type) {
79 case sys::fs::file_magic::unknown:
80 case sys::fs::file_magic::bitcode:
81 case sys::fs::file_magic::archive:
82 case sys::fs::file_magic::macho_universal_binary:
83 case sys::fs::file_magic::windows_resource:
84 return errorCodeToError(object_error::invalid_file_type);
85 case sys::fs::file_magic::elf:
86 case sys::fs::file_magic::elf_relocatable:
87 case sys::fs::file_magic::elf_executable:
88 case sys::fs::file_magic::elf_shared_object:
89 case sys::fs::file_magic::elf_core:
90 return errorOrToExpected(createELFObjectFile(Object));
91 case sys::fs::file_magic::macho_object:
92 case sys::fs::file_magic::macho_executable:
93 case sys::fs::file_magic::macho_fixed_virtual_memory_shared_lib:
94 case sys::fs::file_magic::macho_core:
95 case sys::fs::file_magic::macho_preload_executable:
96 case sys::fs::file_magic::macho_dynamically_linked_shared_lib:
97 case sys::fs::file_magic::macho_dynamic_linker:
98 case sys::fs::file_magic::macho_bundle:
99 case sys::fs::file_magic::macho_dynamically_linked_shared_lib_stub:
100 case sys::fs::file_magic::macho_dsym_companion:
101 case sys::fs::file_magic::macho_kext_bundle:
102 return createMachOObjectFile(Object);
103 case sys::fs::file_magic::coff_object:
104 case sys::fs::file_magic::coff_import_library:
105 case sys::fs::file_magic::pecoff_executable:
106 return errorOrToExpected(createCOFFObjectFile(Object));
107 }
108 llvm_unreachable("Unexpected Object File Type");
109 }
110
111 Expected<OwningBinary<ObjectFile>>
createObjectFile(StringRef ObjectPath)112 ObjectFile::createObjectFile(StringRef ObjectPath) {
113 ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
114 MemoryBuffer::getFile(ObjectPath);
115 if (std::error_code EC = FileOrErr.getError())
116 return errorCodeToError(EC);
117 std::unique_ptr<MemoryBuffer> Buffer = std::move(FileOrErr.get());
118
119 Expected<std::unique_ptr<ObjectFile>> ObjOrErr =
120 createObjectFile(Buffer->getMemBufferRef());
121 if (!ObjOrErr)
122 ObjOrErr.takeError();
123 std::unique_ptr<ObjectFile> Obj = std::move(ObjOrErr.get());
124
125 return OwningBinary<ObjectFile>(std::move(Obj), std::move(Buffer));
126 }
127