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1 : //===- ObjectFile.cpp - File format independent object file ---------------===//
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/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"
28 : #include <algorithm>
29 : #include <cstdint>
30 : #include <memory>
31 : #include <system_error>
32 :
33 : using namespace llvm;
34 : using namespace object;
35 :
36 0 : void ObjectFile::anchor() {}
37 :
38 23479 : ObjectFile::ObjectFile(unsigned int Type, MemoryBufferRef Source)
39 23479 : : SymbolicFile(Type, Source) {}
40 :
41 1538 : bool SectionRef::containsSymbol(SymbolRef S) const {
42 : Expected<section_iterator> SymSec = S.getSection();
43 1538 : if (!SymSec) {
44 : // TODO: Actually report errors helpfully.
45 0 : consumeError(SymSec.takeError());
46 0 : return false;
47 : }
48 1538 : return *this == **SymSec;
49 : }
50 :
51 13255319 : uint64_t ObjectFile::getSymbolValue(DataRefImpl Ref) const {
52 13255319 : uint32_t Flags = getSymbolFlags(Ref);
53 13255319 : if (Flags & SymbolRef::SF_Undefined)
54 : return 0;
55 13218509 : if (Flags & SymbolRef::SF_Common)
56 654 : return getCommonSymbolSize(Ref);
57 13217855 : return getSymbolValueImpl(Ref);
58 : }
59 :
60 5546 : std::error_code ObjectFile::printSymbolName(raw_ostream &OS,
61 : DataRefImpl Symb) const {
62 5546 : Expected<StringRef> Name = getSymbolName(Symb);
63 5546 : if (!Name)
64 4 : return errorToErrorCode(Name.takeError());
65 5544 : OS << *Name;
66 5544 : return std::error_code();
67 : }
68 :
69 0 : uint32_t ObjectFile::getSymbolAlignment(DataRefImpl DRI) const { return 0; }
70 :
71 66928 : bool ObjectFile::isSectionBitcode(DataRefImpl Sec) const {
72 66928 : StringRef SectName;
73 66928 : if (!getSectionName(Sec, SectName))
74 : return SectName == ".llvmbc";
75 : return false;
76 : }
77 :
78 15233 : bool ObjectFile::isSectionStripped(DataRefImpl Sec) const { return false; }
79 :
80 7391 : section_iterator ObjectFile::getRelocatedSection(DataRefImpl Sec) const {
81 14782 : return section_iterator(SectionRef(Sec, this));
82 : }
83 :
84 1407 : Triple ObjectFile::makeTriple() const {
85 : Triple TheTriple;
86 1407 : auto Arch = getArch();
87 1407 : TheTriple.setArch(Triple::ArchType(Arch));
88 :
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
91 : // disassembly.
92 1407 : if (Arch == Triple::arm || Arch == Triple::armeb)
93 35 : setARMSubArch(TheTriple);
94 :
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.
97 2814 : if (isMachO())
98 21 : TheTriple.setObjectFormat(Triple::MachO);
99 :
100 1407 : if (isCOFF()) {
101 : const auto COFFObj = dyn_cast<COFFObjectFile>(this);
102 62 : if (COFFObj->getArch() == Triple::thumb)
103 21 : TheTriple.setTriple("thumbv7-windows");
104 : }
105 :
106 1407 : return TheTriple;
107 : }
108 :
109 : Expected<std::unique_ptr<ObjectFile>>
110 10509 : ObjectFile::createObjectFile(MemoryBufferRef Object, file_magic Type) {
111 10509 : StringRef Data = Object.getBuffer();
112 10509 : if (Type == file_magic::unknown)
113 1483 : Type = identify_magic(Data);
114 :
115 10509 : switch (Type) {
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 : case file_magic::pdb:
123 127 : return errorCodeToError(object_error::invalid_file_type);
124 6311 : case file_magic::elf:
125 : case file_magic::elf_relocatable:
126 : case file_magic::elf_executable:
127 : case file_magic::elf_shared_object:
128 : case file_magic::elf_core:
129 6311 : return createELFObjectFile(Object);
130 1785 : case file_magic::macho_object:
131 : case file_magic::macho_executable:
132 : case file_magic::macho_fixed_virtual_memory_shared_lib:
133 : case file_magic::macho_core:
134 : case file_magic::macho_preload_executable:
135 : case file_magic::macho_dynamically_linked_shared_lib:
136 : case file_magic::macho_dynamic_linker:
137 : case file_magic::macho_bundle:
138 : case file_magic::macho_dynamically_linked_shared_lib_stub:
139 : case file_magic::macho_dsym_companion:
140 : case file_magic::macho_kext_bundle:
141 3570 : return createMachOObjectFile(Object);
142 1926 : case file_magic::coff_object:
143 : case file_magic::coff_import_library:
144 : case file_magic::pecoff_executable:
145 3852 : return createCOFFObjectFile(Object);
146 360 : case file_magic::wasm_object:
147 718 : return createWasmObjectFile(Object);
148 : }
149 0 : llvm_unreachable("Unexpected Object File Type");
150 : }
151 :
152 : Expected<OwningBinary<ObjectFile>>
153 144 : ObjectFile::createObjectFile(StringRef ObjectPath) {
154 : ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
155 144 : MemoryBuffer::getFile(ObjectPath);
156 144 : if (std::error_code EC = FileOrErr.getError())
157 34 : return errorCodeToError(EC);
158 : std::unique_ptr<MemoryBuffer> Buffer = std::move(FileOrErr.get());
159 :
160 : Expected<std::unique_ptr<ObjectFile>> ObjOrErr =
161 330 : createObjectFile(Buffer->getMemBufferRef());
162 110 : if (Error Err = ObjOrErr.takeError())
163 : return std::move(Err);
164 : std::unique_ptr<ObjectFile> Obj = std::move(ObjOrErr.get());
165 :
166 75 : return OwningBinary<ObjectFile>(std::move(Obj), std::move(Buffer));
167 : }
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