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3f676674e7
Avoids the need to include TargetMachine.h from various places just for an enum. Various other enums live here, such as the optimization level, TLS model, etc. Data suggests that this change probably doesn't matter, but it seems nice to have anyway.
99 lines
3.7 KiB
C++
99 lines
3.7 KiB
C++
//===-- ParallelCG.cpp ----------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines functions that can be used for parallel code generation.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/ParallelCG.h"
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#include "llvm/Bitcode/BitcodeReader.h"
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#include "llvm/Bitcode/BitcodeWriter.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/LegacyPassManager.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Support/ErrorOr.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/ThreadPool.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Transforms/Utils/SplitModule.h"
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using namespace llvm;
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static void codegen(Module *M, llvm::raw_pwrite_stream &OS,
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function_ref<std::unique_ptr<TargetMachine>()> TMFactory,
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CodeGenFileType FileType) {
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std::unique_ptr<TargetMachine> TM = TMFactory();
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legacy::PassManager CodeGenPasses;
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if (TM->addPassesToEmitFile(CodeGenPasses, OS, nullptr, FileType))
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report_fatal_error("Failed to setup codegen");
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CodeGenPasses.run(*M);
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}
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std::unique_ptr<Module> llvm::splitCodeGen(
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std::unique_ptr<Module> M, ArrayRef<llvm::raw_pwrite_stream *> OSs,
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ArrayRef<llvm::raw_pwrite_stream *> BCOSs,
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const std::function<std::unique_ptr<TargetMachine>()> &TMFactory,
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CodeGenFileType FileType, bool PreserveLocals) {
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assert(BCOSs.empty() || BCOSs.size() == OSs.size());
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if (OSs.size() == 1) {
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if (!BCOSs.empty())
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WriteBitcodeToFile(*M, *BCOSs[0]);
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codegen(M.get(), *OSs[0], TMFactory, FileType);
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return M;
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}
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// Create ThreadPool in nested scope so that threads will be joined
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// on destruction.
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{
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ThreadPool CodegenThreadPool(OSs.size());
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int ThreadCount = 0;
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SplitModule(
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std::move(M), OSs.size(),
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[&](std::unique_ptr<Module> MPart) {
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// We want to clone the module in a new context to multi-thread the
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// codegen. We do it by serializing partition modules to bitcode
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// (while still on the main thread, in order to avoid data races) and
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// spinning up new threads which deserialize the partitions into
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// separate contexts.
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// FIXME: Provide a more direct way to do this in LLVM.
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SmallString<0> BC;
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raw_svector_ostream BCOS(BC);
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WriteBitcodeToFile(*MPart, BCOS);
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if (!BCOSs.empty()) {
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BCOSs[ThreadCount]->write(BC.begin(), BC.size());
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BCOSs[ThreadCount]->flush();
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}
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llvm::raw_pwrite_stream *ThreadOS = OSs[ThreadCount++];
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// Enqueue the task
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CodegenThreadPool.async(
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[TMFactory, FileType, ThreadOS](const SmallString<0> &BC) {
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LLVMContext Ctx;
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Expected<std::unique_ptr<Module>> MOrErr = parseBitcodeFile(
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MemoryBufferRef(StringRef(BC.data(), BC.size()),
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"<split-module>"),
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Ctx);
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if (!MOrErr)
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report_fatal_error("Failed to read bitcode");
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std::unique_ptr<Module> MPartInCtx = std::move(MOrErr.get());
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codegen(MPartInCtx.get(), *ThreadOS, TMFactory, FileType);
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},
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// Pass BC using std::move to ensure that it get moved rather than
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// copied into the thread's context.
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std::move(BC));
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},
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PreserveLocals);
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}
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return {};
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}
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