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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
86 lines
2.9 KiB
C++
86 lines
2.9 KiB
C++
//===- InferFunctionAttrs.cpp - Infer implicit function attributes --------===//
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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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#include "llvm/Transforms/IPO/InferFunctionAttrs.h"
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#include "llvm/Analysis/TargetLibraryInfo.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/InitializePasses.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Transforms/Utils/BuildLibCalls.h"
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using namespace llvm;
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#define DEBUG_TYPE "inferattrs"
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static bool inferAllPrototypeAttributes(
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Module &M, function_ref<TargetLibraryInfo &(Function &)> GetTLI) {
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bool Changed = false;
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for (Function &F : M.functions())
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// We only infer things using the prototype and the name; we don't need
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// definitions.
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if (F.isDeclaration() && !F.hasOptNone())
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Changed |= inferLibFuncAttributes(F, GetTLI(F));
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return Changed;
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}
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PreservedAnalyses InferFunctionAttrsPass::run(Module &M,
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ModuleAnalysisManager &AM) {
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FunctionAnalysisManager &FAM =
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AM.getResult<FunctionAnalysisManagerModuleProxy>(M).getManager();
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auto GetTLI = [&FAM](Function &F) -> TargetLibraryInfo & {
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return FAM.getResult<TargetLibraryAnalysis>(F);
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};
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if (!inferAllPrototypeAttributes(M, GetTLI))
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// If we didn't infer anything, preserve all analyses.
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return PreservedAnalyses::all();
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// Otherwise, we may have changed fundamental function attributes, so clear
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// out all the passes.
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return PreservedAnalyses::none();
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}
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namespace {
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struct InferFunctionAttrsLegacyPass : public ModulePass {
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static char ID; // Pass identification, replacement for typeid
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InferFunctionAttrsLegacyPass() : ModulePass(ID) {
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initializeInferFunctionAttrsLegacyPassPass(
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*PassRegistry::getPassRegistry());
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}
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.addRequired<TargetLibraryInfoWrapperPass>();
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}
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bool runOnModule(Module &M) override {
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if (skipModule(M))
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return false;
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auto GetTLI = [this](Function &F) -> TargetLibraryInfo & {
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return this->getAnalysis<TargetLibraryInfoWrapperPass>().getTLI(F);
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};
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return inferAllPrototypeAttributes(M, GetTLI);
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}
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};
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}
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char InferFunctionAttrsLegacyPass::ID = 0;
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INITIALIZE_PASS_BEGIN(InferFunctionAttrsLegacyPass, "inferattrs",
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"Infer set function attributes", false, false)
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INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
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INITIALIZE_PASS_END(InferFunctionAttrsLegacyPass, "inferattrs",
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"Infer set function attributes", false, false)
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Pass *llvm::createInferFunctionAttrsLegacyPass() {
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return new InferFunctionAttrsLegacyPass();
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}
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