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[LTO] Add a new splitCodeGen() API which takes a TargetMachineFactory. 

This will be used in lld to avoid creating TargetMachine in two
different places. See D18999 for a more detailed discussion.

Differential Revision:  http://reviews.llvm.org/D19139

llvm-svn: 266390
This commit is contained in:
Davide Italiano 2016-04-15 00:07:28 +00:00
parent 5d7ddfda2d
commit 3fdd27df03
2 changed files with 39 additions and 20 deletions
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13
llvm/include/llvm/CodeGen/ParallelCG.h
View File

@ -43,6 +43,19 @@ splitCodeGen(std::unique_ptr<Module> M, ArrayRef<raw_pwrite_stream *> OSs,
TargetMachine::CodeGenFileType FT = TargetMachine::CGFT_ObjectFile,
bool PreserveLocals = false);
/// Split M into OSs.size() partitions, and generate code for each.
/// It is a variant that takes a factory function for the TargetMachine
/// TMFactory. TMFactory needs to be thread safe on the client side.
/// See the other splitCodeGen() for a more detailed description.
///
/// \returns M if OSs.size() == 1, otherwise returns std::unique_ptr<Module>().
std::unique_ptr<Module>
splitCodeGen(std::unique_ptr<Module> M, ArrayRef<raw_pwrite_stream *> OSs,
ArrayRef<llvm::raw_pwrite_stream *> BCOSs,
const std::function<std::unique_ptr<TargetMachine>()> &TMFactory,
TargetMachine::CodeGenFileType FT = TargetMachine::CGFT_ObjectFile,
bool PreserveLocals = false);
} // namespace llvm
#endif

46
llvm/lib/CodeGen/ParallelCG.cpp
View File

@ -25,39 +25,47 @@
using namespace llvm;
static void codegen(Module *M, llvm::raw_pwrite_stream &OS,
const Target *TheTarget, StringRef CPU, StringRef Features,
const TargetOptions &Options, Reloc::Model RM,
CodeModel::Model CM, CodeGenOpt::Level OL,
TargetMachine::CodeGenFileType FileType) {
std::unique_ptr<TargetMachine> TM(TheTarget->createTargetMachine(
M->getTargetTriple(), CPU, Features, Options, RM, CM, OL));
static void
codegen(Module *M, llvm::raw_pwrite_stream &OS,
const std::function<std::unique_ptr<TargetMachine>()> &TMFactory,
TargetMachine::CodeGenFileType FileType) {
std::unique_ptr<TargetMachine> TM = TMFactory();
legacy::PassManager CodeGenPasses;
if (TM->addPassesToEmitFile(CodeGenPasses, OS, FileType))
report_fatal_error("Failed to setup codegen");
CodeGenPasses.run(*M);
}
std::unique_ptr<Module> llvm::splitCodeGen(
std::unique_ptr<Module> M, ArrayRef<llvm::raw_pwrite_stream *> OSs,
ArrayRef<llvm::raw_pwrite_stream *> BCOSs, StringRef CPU,
StringRef Features, const TargetOptions &Options, Reloc::Model RM,
CodeModel::Model CM, CodeGenOpt::Level OL,
TargetMachine::CodeGenFileType FileType, bool PreserveLocals) {
std::unique_ptr<Module>
llvm::splitCodeGen(std::unique_ptr<Module> M, ArrayRef<raw_pwrite_stream *> OSs,
ArrayRef<llvm::raw_pwrite_stream *> BCOSs, StringRef CPU,
StringRef Features, const TargetOptions &Options,
Reloc::Model RM, CodeModel::Model CM, CodeGenOpt::Level OL,
TargetMachine::CodeGenFileType FileType,
bool PreserveLocals) {
StringRef TripleStr = M->getTargetTriple();
std::string ErrMsg;
const Target *TheTarget = TargetRegistry::lookupTarget(TripleStr, ErrMsg);
if (!TheTarget)
report_fatal_error(Twine("Target not found: ") + ErrMsg);
return splitCodeGen(std::move(M), OSs, BCOSs, [&]() {
return std::unique_ptr<TargetMachine>(TheTarget->createTargetMachine(
TripleStr, CPU, Features, Options, RM, CM, OL));
}, FileType, PreserveLocals);
}
std::unique_ptr<Module> llvm::splitCodeGen(
std::unique_ptr<Module> M, ArrayRef<llvm::raw_pwrite_stream *> OSs,
ArrayRef<llvm::raw_pwrite_stream *> BCOSs,
const std::function<std::unique_ptr<TargetMachine>()> &TMFactory,
TargetMachine::CodeGenFileType FileType, bool PreserveLocals) {
assert(BCOSs.empty() || BCOSs.size() == OSs.size());
if (OSs.size() == 1) {
if (!BCOSs.empty())
WriteBitcodeToFile(M.get(), *BCOSs[0]);
codegen(M.get(), *OSs[0], TheTarget, CPU, Features, Options, RM, CM, OL,
FileType);
codegen(M.get(), *OSs[0], TMFactory, FileType);
return M;
}
@ -88,8 +96,7 @@ std::unique_ptr<Module> llvm::splitCodeGen(
llvm::raw_pwrite_stream *ThreadOS = OSs[ThreadCount++];
// Enqueue the task
CodegenThreadPool.async(
[TheTarget, CPU, Features, Options, RM, CM, OL, FileType,
ThreadOS](const SmallVector<char, 0> &BC) {
[&TMFactory, FileType, ThreadOS](const SmallVector<char, 0> &BC) {
LLVMContext Ctx;
ErrorOr<std::unique_ptr<Module>> MOrErr = parseBitcodeFile(
MemoryBufferRef(StringRef(BC.data(), BC.size()),
@ -99,8 +106,7 @@ std::unique_ptr<Module> llvm::splitCodeGen(
report_fatal_error("Failed to read bitcode");
std::unique_ptr<Module> MPartInCtx = std::move(MOrErr.get());
codegen(MPartInCtx.get(), *ThreadOS, TheTarget, CPU, Features,
Options, RM, CM, OL, FileType);
codegen(MPartInCtx.get(), *ThreadOS, TMFactory, FileType);
},
// Pass BC using std::move to ensure that it get moved rather than
// copied into the thread's context.