1 //==- ModuleSummaryIndexObjectFile.cpp - Summary index file implementation -==//
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 // Part of the ModuleSummaryIndexObjectFile class implementation.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/ADT/STLExtras.h"
15 #include "llvm/ADT/StringRef.h"
16 #include "llvm/Bitcode/BitcodeReader.h"
17 #include "llvm/IR/ModuleSummaryIndex.h"
18 #include "llvm/Object/Binary.h"
19 #include "llvm/Object/Error.h"
20 #include "llvm/Object/ModuleSummaryIndexObjectFile.h"
21 #include "llvm/Object/ObjectFile.h"
22 #include "llvm/Support/CommandLine.h"
23 #include "llvm/Support/Error.h"
24 #include "llvm/Support/ErrorOr.h"
25 #include "llvm/Support/FileSystem.h"
26 #include "llvm/Support/MemoryBuffer.h"
29 #include <system_error>
32 using namespace object;
34 static cl::opt<bool> IgnoreEmptyThinLTOIndexFile(
35 "ignore-empty-index-file", cl::ZeroOrMore,
37 "Ignore an empty index file and perform non-ThinLTO compilation"),
40 ModuleSummaryIndexObjectFile::ModuleSummaryIndexObjectFile(
41 MemoryBufferRef Object, std::unique_ptr<ModuleSummaryIndex> I)
42 : SymbolicFile(Binary::ID_ModuleSummaryIndex, Object), Index(std::move(I)) {
45 ModuleSummaryIndexObjectFile::~ModuleSummaryIndexObjectFile() = default;
47 std::unique_ptr<ModuleSummaryIndex> ModuleSummaryIndexObjectFile::takeIndex() {
48 return std::move(Index);
51 ErrorOr<MemoryBufferRef>
52 ModuleSummaryIndexObjectFile::findBitcodeInObject(const ObjectFile &Obj) {
53 for (const SectionRef &Sec : Obj.sections()) {
54 if (Sec.isBitcode()) {
55 StringRef SecContents;
56 if (std::error_code EC = Sec.getContents(SecContents))
58 return MemoryBufferRef(SecContents, Obj.getFileName());
62 return object_error::bitcode_section_not_found;
65 ErrorOr<MemoryBufferRef>
66 ModuleSummaryIndexObjectFile::findBitcodeInMemBuffer(MemoryBufferRef Object) {
67 sys::fs::file_magic Type = sys::fs::identify_magic(Object.getBuffer());
69 case sys::fs::file_magic::bitcode:
71 case sys::fs::file_magic::elf_relocatable:
72 case sys::fs::file_magic::macho_object:
73 case sys::fs::file_magic::coff_object: {
74 Expected<std::unique_ptr<ObjectFile>> ObjFile =
75 ObjectFile::createObjectFile(Object, Type);
77 return errorToErrorCode(ObjFile.takeError());
78 return findBitcodeInObject(*ObjFile->get());
81 return object_error::invalid_file_type;
85 // Parse module summary index in the given memory buffer.
86 // Return new ModuleSummaryIndexObjectFile instance containing parsed
87 // module summary/index.
88 Expected<std::unique_ptr<ModuleSummaryIndexObjectFile>>
89 ModuleSummaryIndexObjectFile::create(MemoryBufferRef Object) {
90 ErrorOr<MemoryBufferRef> BCOrErr = findBitcodeInMemBuffer(Object);
92 return errorCodeToError(BCOrErr.getError());
94 Expected<std::unique_ptr<ModuleSummaryIndex>> IOrErr =
95 getModuleSummaryIndex(BCOrErr.get());
98 return IOrErr.takeError();
100 std::unique_ptr<ModuleSummaryIndex> Index = std::move(IOrErr.get());
101 return llvm::make_unique<ModuleSummaryIndexObjectFile>(Object,
105 // Parse the module summary index out of an IR file and return the summary
106 // index object if found, or nullptr if not.
107 Expected<std::unique_ptr<ModuleSummaryIndex>>
108 llvm::getModuleSummaryIndexForFile(StringRef Path, StringRef Identifier) {
109 ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
110 MemoryBuffer::getFileOrSTDIN(Path);
111 std::error_code EC = FileOrErr.getError();
113 return errorCodeToError(EC);
114 std::unique_ptr<MemoryBuffer> MemBuffer = std::move(FileOrErr.get());
115 // If Identifier is non-empty, use it as the buffer identifier, which
116 // will become the module path in the index.
117 if (Identifier.empty())
118 Identifier = MemBuffer->getBufferIdentifier();
119 MemoryBufferRef BufferRef(MemBuffer->getBuffer(), Identifier);
120 if (IgnoreEmptyThinLTOIndexFile && !BufferRef.getBufferSize())
122 Expected<std::unique_ptr<object::ModuleSummaryIndexObjectFile>> ObjOrErr =
123 object::ModuleSummaryIndexObjectFile::create(BufferRef);
125 return ObjOrErr.takeError();
127 object::ModuleSummaryIndexObjectFile &Obj = **ObjOrErr;
128 return Obj.takeIndex();