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99 lines
3.3 KiB
C++
99 lines
3.3 KiB
C++
//===-- CGProfile.cpp -----------------------------------------------------===//
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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/Instrumentation/CGProfile.h"
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#include "llvm/ADT/MapVector.h"
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#include "llvm/Analysis/BlockFrequencyInfo.h"
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#include "llvm/Analysis/TargetTransformInfo.h"
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#include "llvm/IR/CallSite.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/MDBuilder.h"
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#include "llvm/IR/PassManager.h"
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#include "llvm/ProfileData/InstrProf.h"
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#include "llvm/Transforms/Instrumentation.h"
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#include <array>
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using namespace llvm;
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PreservedAnalyses CGProfilePass::run(Module &M, ModuleAnalysisManager &MAM) {
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MapVector<std::pair<Function *, Function *>, uint64_t> Counts;
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FunctionAnalysisManager &FAM =
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MAM.getResult<FunctionAnalysisManagerModuleProxy>(M).getManager();
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InstrProfSymtab Symtab;
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auto UpdateCounts = [&](TargetTransformInfo &TTI, Function *F,
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Function *CalledF, uint64_t NewCount) {
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if (!CalledF || !TTI.isLoweredToCall(CalledF))
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return;
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uint64_t &Count = Counts[std::make_pair(F, CalledF)];
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Count = SaturatingAdd(Count, NewCount);
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};
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// Ignore error here. Indirect calls are ignored if this fails.
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(void)(bool)Symtab.create(M);
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for (auto &F : M) {
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if (F.isDeclaration())
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continue;
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auto &BFI = FAM.getResult<BlockFrequencyAnalysis>(F);
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if (BFI.getEntryFreq() == 0)
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continue;
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TargetTransformInfo &TTI = FAM.getResult<TargetIRAnalysis>(F);
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for (auto &BB : F) {
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Optional<uint64_t> BBCount = BFI.getBlockProfileCount(&BB);
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if (!BBCount)
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continue;
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for (auto &I : BB) {
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CallSite CS(&I);
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if (!CS)
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continue;
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if (CS.isIndirectCall()) {
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InstrProfValueData ValueData[8];
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uint32_t ActualNumValueData;
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uint64_t TotalC;
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if (!getValueProfDataFromInst(*CS.getInstruction(),
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IPVK_IndirectCallTarget, 8, ValueData,
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ActualNumValueData, TotalC))
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continue;
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for (const auto &VD :
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ArrayRef<InstrProfValueData>(ValueData, ActualNumValueData)) {
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UpdateCounts(TTI, &F, Symtab.getFunction(VD.Value), VD.Count);
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}
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continue;
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}
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UpdateCounts(TTI, &F, CS.getCalledFunction(), *BBCount);
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}
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}
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}
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addModuleFlags(M, Counts);
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return PreservedAnalyses::all();
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}
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void CGProfilePass::addModuleFlags(
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Module &M,
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MapVector<std::pair<Function *, Function *>, uint64_t> &Counts) const {
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if (Counts.empty())
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return;
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LLVMContext &Context = M.getContext();
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MDBuilder MDB(Context);
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std::vector<Metadata *> Nodes;
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for (auto E : Counts) {
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Metadata *Vals[] = {ValueAsMetadata::get(E.first.first),
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ValueAsMetadata::get(E.first.second),
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MDB.createConstant(ConstantInt::get(
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Type::getInt64Ty(Context), E.second))};
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Nodes.push_back(MDNode::get(Context, Vals));
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}
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M.addModuleFlag(Module::Append, "CG Profile", MDNode::get(Context, Nodes));
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}
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