53 lines
2 KiB
C++
53 lines
2 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/Module.h"
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#include "llvm/Transforms/Utils/BuildLibCalls.h"
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#include "llvm/Transforms/Utils/Local.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. This ensures libfuncs are annotated and also allows our
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// CGSCC inference to avoid needing to duplicate the inference from other
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// attribute logic on all calls to declarations (as declarations aren't
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// explicitly visited by CGSCC passes in the new pass manager.)
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if (F.isDeclaration() && !F.hasOptNone()) {
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if (!F.hasFnAttribute(Attribute::NoBuiltin))
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Changed |= inferNonMandatoryLibFuncAttrs(F, GetTLI(F));
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Changed |= inferAttributesFromOthers(F);
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}
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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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