1 //===-- CGProfile.cpp -----------------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/Transforms/Instrumentation/CGProfile.h"
12 #include "llvm/ADT/MapVector.h"
13 #include "llvm/Analysis/BlockFrequencyInfo.h"
14 #include "llvm/Analysis/TargetTransformInfo.h"
15 #include "llvm/IR/CallSite.h"
16 #include "llvm/IR/Constants.h"
17 #include "llvm/IR/Instructions.h"
18 #include "llvm/IR/MDBuilder.h"
19 #include "llvm/IR/PassManager.h"
20 #include "llvm/ProfileData/InstrProf.h"
21 #include "llvm/Transforms/Instrumentation.h"
27 PreservedAnalyses CGProfilePass::run(Module &M, ModuleAnalysisManager &MAM) {
28 MapVector<std::pair<Function *, Function *>, uint64_t> Counts;
29 FunctionAnalysisManager &FAM =
30 MAM.getResult<FunctionAnalysisManagerModuleProxy>(M).getManager();
31 InstrProfSymtab Symtab;
32 auto UpdateCounts = [&](TargetTransformInfo &TTI, Function *F,
33 Function *CalledF, uint64_t NewCount) {
34 if (!CalledF || !TTI.isLoweredToCall(CalledF))
36 uint64_t &Count = Counts[std::make_pair(F, CalledF)];
37 Count = SaturatingAdd(Count, NewCount);
39 // Ignore error here. Indirect calls are ignored if this fails.
40 (void)(bool)Symtab.create(M);
42 if (F.isDeclaration())
44 auto &BFI = FAM.getResult<BlockFrequencyAnalysis>(F);
45 if (BFI.getEntryFreq() == 0)
47 TargetTransformInfo &TTI = FAM.getResult<TargetIRAnalysis>(F);
49 Optional<uint64_t> BBCount = BFI.getBlockProfileCount(&BB);
56 if (CS.isIndirectCall()) {
57 InstrProfValueData ValueData[8];
58 uint32_t ActualNumValueData;
60 if (!getValueProfDataFromInst(*CS.getInstruction(),
61 IPVK_IndirectCallTarget, 8, ValueData,
62 ActualNumValueData, TotalC))
65 ArrayRef<InstrProfValueData>(ValueData, ActualNumValueData)) {
66 UpdateCounts(TTI, &F, Symtab.getFunction(VD.Value), VD.Count);
70 UpdateCounts(TTI, &F, CS.getCalledFunction(), *BBCount);
75 addModuleFlags(M, Counts);
77 return PreservedAnalyses::all();
80 void CGProfilePass::addModuleFlags(
82 MapVector<std::pair<Function *, Function *>, uint64_t> &Counts) const {
86 LLVMContext &Context = M.getContext();
87 MDBuilder MDB(Context);
88 std::vector<Metadata *> Nodes;
90 for (auto E : Counts) {
91 Metadata *Vals[] = {ValueAsMetadata::get(E.first.first),
92 ValueAsMetadata::get(E.first.second),
93 MDB.createConstant(ConstantInt::get(
94 Type::getInt64Ty(Context), E.second))};
95 Nodes.push_back(MDNode::get(Context, Vals));
98 M.addModuleFlag(Module::Append, "CG Profile", MDNode::get(Context, Nodes));