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76739f43a9
Now the pass is just a tiny wrapper around the util. This lets us reuse the logic elsewhere (done here for BuildLibCalls) instead of duplicating it. The next step is to have something like getOrInsertLibFunc that also sets the attributes. Differential Revision: http://reviews.llvm.org/D19470 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267759 91177308-0d34-0410-b5e6-96231b3b80d8
81 lines
2.7 KiB
C++
81 lines
2.7 KiB
C++
//===- InferFunctionAttrs.cpp - Infer implicit function attributes --------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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/Analysis/MemoryBuiltins.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/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(Module &M,
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const TargetLibraryInfo &TLI) {
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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.hasFnAttribute((Attribute::OptimizeNone)))
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Changed |= inferLibFuncAttributes(F, TLI);
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return Changed;
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}
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PreservedAnalyses InferFunctionAttrsPass::run(Module &M,
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AnalysisManager<Module> &AM) {
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auto &TLI = AM.getResult<TargetLibraryAnalysis>(M);
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if (!inferAllPrototypeAttributes(M, TLI))
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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 &TLI = getAnalysis<TargetLibraryInfoWrapperPass>().getTLI();
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return inferAllPrototypeAttributes(M, TLI);
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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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