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/ObjectFile.h"
15 #include "llvm/Support/ErrorHandling.h"
16 #include "llvm/Support/FileSystem.h"
17 #include "llvm/Support/MemoryBuffer.h"
18 #include "llvm/Support/raw_ostream.h"
19 #include <system_error>
20
21 using namespace llvm;
22 using namespace object;
23
anchor()24 void ObjectFile::anchor() { }
25
ObjectFile(unsigned int Type,std::unique_ptr<MemoryBuffer> Source)26 ObjectFile::ObjectFile(unsigned int Type, std::unique_ptr<MemoryBuffer> Source)
27 : SymbolicFile(Type, std::move(Source)) {}
28
printSymbolName(raw_ostream & OS,DataRefImpl Symb) const29 std::error_code ObjectFile::printSymbolName(raw_ostream &OS,
30 DataRefImpl Symb) const {
31 StringRef Name;
32 if (std::error_code EC = getSymbolName(Symb, Name))
33 return EC;
34 OS << Name;
35 return object_error::success;
36 }
37
getSymbolAlignment(DataRefImpl DRI,uint32_t & Result) const38 std::error_code ObjectFile::getSymbolAlignment(DataRefImpl DRI,
39 uint32_t &Result) const {
40 Result = 0;
41 return object_error::success;
42 }
43
getRelocatedSection(DataRefImpl Sec) const44 section_iterator ObjectFile::getRelocatedSection(DataRefImpl Sec) const {
45 return section_iterator(SectionRef(Sec, this));
46 }
47
48 ErrorOr<ObjectFile *>
createObjectFile(std::unique_ptr<MemoryBuffer> & Object,sys::fs::file_magic Type)49 ObjectFile::createObjectFile(std::unique_ptr<MemoryBuffer> &Object,
50 sys::fs::file_magic Type) {
51 if (Type == sys::fs::file_magic::unknown)
52 Type = sys::fs::identify_magic(Object->getBuffer());
53
54 switch (Type) {
55 case sys::fs::file_magic::unknown:
56 case sys::fs::file_magic::bitcode:
57 case sys::fs::file_magic::archive:
58 case sys::fs::file_magic::macho_universal_binary:
59 case sys::fs::file_magic::windows_resource:
60 return object_error::invalid_file_type;
61 case sys::fs::file_magic::elf_relocatable:
62 case sys::fs::file_magic::elf_executable:
63 case sys::fs::file_magic::elf_shared_object:
64 case sys::fs::file_magic::elf_core:
65 return createELFObjectFile(Object);
66 case sys::fs::file_magic::macho_object:
67 case sys::fs::file_magic::macho_executable:
68 case sys::fs::file_magic::macho_fixed_virtual_memory_shared_lib:
69 case sys::fs::file_magic::macho_core:
70 case sys::fs::file_magic::macho_preload_executable:
71 case sys::fs::file_magic::macho_dynamically_linked_shared_lib:
72 case sys::fs::file_magic::macho_dynamic_linker:
73 case sys::fs::file_magic::macho_bundle:
74 case sys::fs::file_magic::macho_dynamically_linked_shared_lib_stub:
75 case sys::fs::file_magic::macho_dsym_companion:
76 return createMachOObjectFile(Object);
77 case sys::fs::file_magic::coff_object:
78 case sys::fs::file_magic::coff_import_library:
79 case sys::fs::file_magic::pecoff_executable:
80 return createCOFFObjectFile(std::move(Object));
81 }
82 llvm_unreachable("Unexpected Object File Type");
83 }
84
createObjectFile(StringRef ObjectPath)85 ErrorOr<ObjectFile *> ObjectFile::createObjectFile(StringRef ObjectPath) {
86 ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
87 MemoryBuffer::getFile(ObjectPath);
88 if (std::error_code EC = FileOrErr.getError())
89 return EC;
90 return createObjectFile(FileOrErr.get());
91 }
92