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[object] Improve the performance of getSymbols used by ArchiveWriter

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In this diff we adjust the code of getSymbols to avoid creating LLVMContext when it's not necessary.
Without this patch when the function getSymbols was called on a MachO object with a __bitcode section
it was parsing the embedded bitcode and then ignoring the result.

Test plan: make check-all

Differential revision: https://reviews.llvm.org/D51759

llvm-svn: 341998
This commit is contained in:
Alexander Shaposhnikov 2018-09-11 22:00:47 +00:00
parent acba76ae5a
commit 6d7de2c4b9
1 changed files with 23 additions and 11 deletions
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34
lib/Object/ArchiveWriter.cpp
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@ -372,20 +372,32 @@ static void writeSymbolTable(raw_ostream &Out, object::Archive::Kind Kind,
static Expected<std::vector<unsigned>>
getSymbols(MemoryBufferRef Buf, raw_ostream &SymNames, bool &HasObject) {
std::vector<unsigned> Ret;
LLVMContext Context;
Expected<std::unique_ptr<object::SymbolicFile>> ObjOrErr =
object::SymbolicFile::createSymbolicFile(Buf, llvm::file_magic::unknown,
&Context);
if (!ObjOrErr) {
// FIXME: check only for "not an object file" errors.
consumeError(ObjOrErr.takeError());
return Ret;
// In the scenario when LLVMContext is populated SymbolicFile will contain a
// reference to it, thus SymbolicFile should be destroyed first.
LLVMContext Context;
std::unique_ptr<object::SymbolicFile> Obj;
if (identify_magic(Buf.getBuffer()) == file_magic::bitcode) {
auto ObjOrErr = object::SymbolicFile::createSymbolicFile(
Buf, file_magic::bitcode, &Context);
if (!ObjOrErr) {
// FIXME: check only for "not an object file" errors.
consumeError(ObjOrErr.takeError());
return Ret;
}
Obj = std::move(*ObjOrErr);
} else {
auto ObjOrErr = object::SymbolicFile::createSymbolicFile(Buf);
if (!ObjOrErr) {
// FIXME: check only for "not an object file" errors.
consumeError(ObjOrErr.takeError());
return Ret;
}
Obj = std::move(*ObjOrErr);
}
HasObject = true;
object::SymbolicFile &Obj = *ObjOrErr.get();
for (const object::BasicSymbolRef &S : Obj.symbols()) {
for (const object::BasicSymbolRef &S : Obj->symbols()) {
if (!isArchiveSymbol(S))
continue;
Ret.push_back(SymNames.tell());
@ -470,7 +482,7 @@ Error llvm::writeArchive(StringRef ArcName,
if (WriteSymtab) {
uint64_t MaxOffset = 0;
uint64_t LastOffset = MaxOffset;
for (const auto& M : Data) {
for (const auto &M : Data) {
// Record the start of the member's offset
LastOffset = MaxOffset;
// Account for the size of each part associated with the member.