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05da2fe521
This file lists every pass in LLVM, and is included by Pass.h, which is very popular. Every time we add, remove, or rename a pass in LLVM, it caused lots of recompilation. I found this fact by looking at this table, which is sorted by the number of times a file was changed over the last 100,000 git commits multiplied by the number of object files that depend on it in the current checkout: recompiles touches affected_files header 342380 95 3604 llvm/include/llvm/ADT/STLExtras.h 314730 234 1345 llvm/include/llvm/InitializePasses.h 307036 118 2602 llvm/include/llvm/ADT/APInt.h 213049 59 3611 llvm/include/llvm/Support/MathExtras.h 170422 47 3626 llvm/include/llvm/Support/Compiler.h 162225 45 3605 llvm/include/llvm/ADT/Optional.h 158319 63 2513 llvm/include/llvm/ADT/Triple.h 140322 39 3598 llvm/include/llvm/ADT/StringRef.h 137647 59 2333 llvm/include/llvm/Support/Error.h 131619 73 1803 llvm/include/llvm/Support/FileSystem.h Before this change, touching InitializePasses.h would cause 1345 files to recompile. After this change, touching it only causes 550 compiles in an incremental rebuild. Reviewers: bkramer, asbirlea, bollu, jdoerfert Differential Revision: https://reviews.llvm.org/D70211
87 lines
3.2 KiB
C++
87 lines
3.2 KiB
C++
//===- BitcodeWriterPass.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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// BitcodeWriterPass implementation.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Bitcode/BitcodeWriterPass.h"
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#include "llvm/Analysis/ModuleSummaryAnalysis.h"
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#include "llvm/Bitcode/BitcodeWriter.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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using namespace llvm;
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PreservedAnalyses BitcodeWriterPass::run(Module &M, ModuleAnalysisManager &AM) {
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const ModuleSummaryIndex *Index =
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EmitSummaryIndex ? &(AM.getResult<ModuleSummaryIndexAnalysis>(M))
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: nullptr;
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WriteBitcodeToFile(M, OS, ShouldPreserveUseListOrder, Index, EmitModuleHash);
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return PreservedAnalyses::all();
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}
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namespace {
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class WriteBitcodePass : public ModulePass {
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raw_ostream &OS; // raw_ostream to print on
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bool ShouldPreserveUseListOrder;
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bool EmitSummaryIndex;
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bool EmitModuleHash;
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public:
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static char ID; // Pass identification, replacement for typeid
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WriteBitcodePass() : ModulePass(ID), OS(dbgs()) {
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initializeWriteBitcodePassPass(*PassRegistry::getPassRegistry());
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}
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explicit WriteBitcodePass(raw_ostream &o, bool ShouldPreserveUseListOrder,
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bool EmitSummaryIndex, bool EmitModuleHash)
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: ModulePass(ID), OS(o),
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ShouldPreserveUseListOrder(ShouldPreserveUseListOrder),
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EmitSummaryIndex(EmitSummaryIndex), EmitModuleHash(EmitModuleHash) {
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initializeWriteBitcodePassPass(*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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const ModuleSummaryIndex *Index =
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EmitSummaryIndex
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? &(getAnalysis<ModuleSummaryIndexWrapperPass>().getIndex())
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: nullptr;
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WriteBitcodeToFile(M, OS, ShouldPreserveUseListOrder, Index,
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EmitModuleHash);
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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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if (EmitSummaryIndex)
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AU.addRequired<ModuleSummaryIndexWrapperPass>();
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}
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};
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}
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char WriteBitcodePass::ID = 0;
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INITIALIZE_PASS_BEGIN(WriteBitcodePass, "write-bitcode", "Write Bitcode", false,
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true)
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INITIALIZE_PASS_DEPENDENCY(ModuleSummaryIndexWrapperPass)
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INITIALIZE_PASS_END(WriteBitcodePass, "write-bitcode", "Write Bitcode", false,
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true)
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ModulePass *llvm::createBitcodeWriterPass(raw_ostream &Str,
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bool ShouldPreserveUseListOrder,
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bool EmitSummaryIndex, bool EmitModuleHash) {
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return new WriteBitcodePass(Str, ShouldPreserveUseListOrder,
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EmitSummaryIndex, EmitModuleHash);
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}
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bool llvm::isBitcodeWriterPass(Pass *P) {
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return P->getPassID() == (llvm::AnalysisID)&WriteBitcodePass::ID;
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}
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