9c27b59cec
Summary: This is the first change to enable the TLI to be built per-function so that -fno-builtin* handling can be migrated to use function attributes. See discussion on D61634 for background. This is an enabler for fixing handling of these options for LTO, for example. This change should not affect behavior, as the provided function is not yet used to build a specifically per-function TLI, but rather enables that migration. Most of the changes were very mechanical, e.g. passing a Function to the legacy analysis pass's getTLI interface, or in Module level cases, adding a callback. This is similar to the way the per-function TTI analysis works. There was one place where we were looking for builtins but not in the context of a specific function. See FindCXAAtExit in lib/Transforms/IPO/GlobalOpt.cpp. I'm somewhat concerned my workaround could provide the wrong behavior in some corner cases. Suggestions welcome. Reviewers: chandlerc, hfinkel Subscribers: arsenm, dschuff, jvesely, nhaehnle, mehdi_amini, javed.absar, sbc100, jgravelle-google, eraman, aheejin, steven_wu, george.burgess.iv, dexonsmith, jfb, asbirlea, gchatelet, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D66428 llvm-svn: 371284
85 lines
2.9 KiB
C++
85 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/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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