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/Object/ModuleSummaryIndexObjectFile.h"
15 #include "llvm/ADT/STLExtras.h"
16 #include "llvm/Bitcode/BitcodeReader.h"
17 #include "llvm/IR/ModuleSummaryIndex.h"
18 #include "llvm/MC/MCStreamer.h"
19 #include "llvm/Object/ObjectFile.h"
20 #include "llvm/Support/MemoryBuffer.h"
21 #include "llvm/Support/raw_ostream.h"
23 using namespace object;
25 static llvm::cl::opt<bool> IgnoreEmptyThinLTOIndexFile(
26 "ignore-empty-index-file", llvm::cl::ZeroOrMore,
28 "Ignore an empty index file and perform non-ThinLTO compilation"),
29 llvm::cl::init(false));
31 ModuleSummaryIndexObjectFile::ModuleSummaryIndexObjectFile(
32 MemoryBufferRef Object, std::unique_ptr<ModuleSummaryIndex> I)
33 : SymbolicFile(Binary::ID_ModuleSummaryIndex, Object), Index(std::move(I)) {
36 ModuleSummaryIndexObjectFile::~ModuleSummaryIndexObjectFile() {}
38 std::unique_ptr<ModuleSummaryIndex> ModuleSummaryIndexObjectFile::takeIndex() {
39 return std::move(Index);
42 ErrorOr<MemoryBufferRef>
43 ModuleSummaryIndexObjectFile::findBitcodeInObject(const ObjectFile &Obj) {
44 for (const SectionRef &Sec : Obj.sections()) {
45 if (Sec.isBitcode()) {
46 StringRef SecContents;
47 if (std::error_code EC = Sec.getContents(SecContents))
49 return MemoryBufferRef(SecContents, Obj.getFileName());
53 return object_error::bitcode_section_not_found;
56 ErrorOr<MemoryBufferRef>
57 ModuleSummaryIndexObjectFile::findBitcodeInMemBuffer(MemoryBufferRef Object) {
58 sys::fs::file_magic Type = sys::fs::identify_magic(Object.getBuffer());
60 case sys::fs::file_magic::bitcode:
62 case sys::fs::file_magic::elf_relocatable:
63 case sys::fs::file_magic::macho_object:
64 case sys::fs::file_magic::coff_object: {
65 Expected<std::unique_ptr<ObjectFile>> ObjFile =
66 ObjectFile::createObjectFile(Object, Type);
68 return errorToErrorCode(ObjFile.takeError());
69 return findBitcodeInObject(*ObjFile->get());
72 return object_error::invalid_file_type;
76 // Parse module summary index in the given memory buffer.
77 // Return new ModuleSummaryIndexObjectFile instance containing parsed
78 // module summary/index.
79 Expected<std::unique_ptr<ModuleSummaryIndexObjectFile>>
80 ModuleSummaryIndexObjectFile::create(MemoryBufferRef Object) {
81 ErrorOr<MemoryBufferRef> BCOrErr = findBitcodeInMemBuffer(Object);
83 return errorCodeToError(BCOrErr.getError());
85 Expected<std::unique_ptr<ModuleSummaryIndex>> IOrErr =
86 getModuleSummaryIndex(BCOrErr.get());
89 return IOrErr.takeError();
91 std::unique_ptr<ModuleSummaryIndex> Index = std::move(IOrErr.get());
92 return llvm::make_unique<ModuleSummaryIndexObjectFile>(Object,
96 // Parse the module summary index out of an IR file and return the summary
97 // index object if found, or nullptr if not.
98 Expected<std::unique_ptr<ModuleSummaryIndex>>
99 llvm::getModuleSummaryIndexForFile(StringRef Path) {
100 ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
101 MemoryBuffer::getFileOrSTDIN(Path);
102 std::error_code EC = FileOrErr.getError();
104 return errorCodeToError(EC);
105 MemoryBufferRef BufferRef = (FileOrErr.get())->getMemBufferRef();
106 if (IgnoreEmptyThinLTOIndexFile && !BufferRef.getBufferSize())
108 Expected<std::unique_ptr<object::ModuleSummaryIndexObjectFile>> ObjOrErr =
109 object::ModuleSummaryIndexObjectFile::create(BufferRef);
111 return ObjOrErr.takeError();
113 object::ModuleSummaryIndexObjectFile &Obj = **ObjOrErr;
114 return Obj.takeIndex();