979c275097
The module currently stores the target triple as a string. This means that any code that wants to actually use the triple first has to instantiate a Triple, which is somewhat expensive. The change in #121652 caused a moderate compile-time regression due to this. While it would be easy enough to work around, I think that architecturally, it makes more sense to store the parsed Triple in the module, so that it can always be directly queried. For this change, I've opted not to add any magic conversions between std::string and Triple for backwards-compatibilty purses, and instead write out needed Triple()s or str()s explicitly. This is because I think a decent number of them should be changed to work on Triple as well, to avoid unnecessary conversions back and forth. The only interesting part in this patch is that the default triple is Triple("") instead of Triple() to preserve existing behavior. The former defaults to using the ELF object format instead of unknown object format. We should fix that as well.
110 lines
3.4 KiB
C++
110 lines
3.4 KiB
C++
//===- DXILWriterPass.cpp - Bitcode writing pass --------------------------===//
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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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// DXILWriterPass implementation.
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//
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//===----------------------------------------------------------------------===//
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#include "DXILWriterPass.h"
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#include "DXILBitcodeWriter.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Analysis/ModuleSummaryAnalysis.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/PassManager.h"
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#include "llvm/InitializePasses.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/Alignment.h"
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#include "llvm/Transforms/Utils/ModuleUtils.h"
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using namespace llvm;
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using namespace llvm::dxil;
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namespace {
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class WriteDXILPass : public llvm::ModulePass {
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raw_ostream &OS; // raw_ostream to print on
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public:
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static char ID; // Pass identification, replacement for typeid
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WriteDXILPass() : ModulePass(ID), OS(dbgs()) {
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initializeWriteDXILPassPass(*PassRegistry::getPassRegistry());
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}
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explicit WriteDXILPass(raw_ostream &o) : ModulePass(ID), OS(o) {
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initializeWriteDXILPassPass(*PassRegistry::getPassRegistry());
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}
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StringRef getPassName() const override { return "Bitcode Writer"; }
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bool runOnModule(Module &M) override {
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WriteDXILToFile(M, OS);
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return false;
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}
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.setPreservesAll();
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}
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};
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class EmbedDXILPass : public llvm::ModulePass {
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public:
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static char ID; // Pass identification, replacement for typeid
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EmbedDXILPass() : ModulePass(ID) {
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initializeEmbedDXILPassPass(*PassRegistry::getPassRegistry());
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}
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StringRef getPassName() const override { return "DXIL Embedder"; }
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bool runOnModule(Module &M) override {
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std::string Data;
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llvm::raw_string_ostream OS(Data);
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Triple OriginalTriple = M.getTargetTriple();
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// Set to DXIL triple when write to bitcode.
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// Only the output bitcode need to be DXIL triple.
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M.setTargetTriple(Triple("dxil-ms-dx"));
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WriteDXILToFile(M, OS);
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// Recover triple.
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M.setTargetTriple(OriginalTriple);
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Constant *ModuleConstant =
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ConstantDataArray::get(M.getContext(), arrayRefFromStringRef(Data));
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auto *GV = new llvm::GlobalVariable(M, ModuleConstant->getType(), true,
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GlobalValue::PrivateLinkage,
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ModuleConstant, "dx.dxil");
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GV->setSection("DXIL");
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GV->setAlignment(Align(4));
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appendToCompilerUsed(M, {GV});
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return true;
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}
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.setPreservesAll();
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}
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};
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} // namespace
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char WriteDXILPass::ID = 0;
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INITIALIZE_PASS_BEGIN(WriteDXILPass, "dxil-write-bitcode", "Write Bitcode",
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false, true)
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INITIALIZE_PASS_DEPENDENCY(ModuleSummaryIndexWrapperPass)
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INITIALIZE_PASS_END(WriteDXILPass, "dxil-write-bitcode", "Write Bitcode", false,
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true)
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ModulePass *llvm::createDXILWriterPass(raw_ostream &Str) {
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return new WriteDXILPass(Str);
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}
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char EmbedDXILPass::ID = 0;
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INITIALIZE_PASS(EmbedDXILPass, "dxil-embed", "Embed DXIL", false, true)
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ModulePass *llvm::createDXILEmbedderPass() { return new EmbedDXILPass(); }
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