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79 lines
2.6 KiB
C++
79 lines
2.6 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/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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ModuleAnalysisManager &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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