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|
//===- bolt/Profile/YAMLProfileWriter.cpp - YAML profile serializer -------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "bolt/Profile/YAMLProfileWriter.h"
#include "bolt/Core/BinaryBasicBlock.h"
#include "bolt/Core/BinaryFunction.h"
#include "bolt/Profile/ProfileReaderBase.h"
#include "bolt/Profile/ProfileYAMLMapping.h"
#include "bolt/Rewrite/RewriteInstance.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/raw_ostream.h"
#undef DEBUG_TYPE
#define DEBUG_TYPE "bolt-prof"
namespace llvm {
namespace bolt {
namespace {
void convert(const BinaryFunction &BF,
yaml::bolt::BinaryFunctionProfile &YamlBF) {
const BinaryContext &BC = BF.getBinaryContext();
const uint16_t LBRProfile = BF.getProfileFlags() & BinaryFunction::PF_LBR;
YamlBF.Name = BF.getPrintName();
YamlBF.Id = BF.getFunctionNumber();
YamlBF.Hash = BF.computeHash(/*UseDFS=*/true);
YamlBF.NumBasicBlocks = BF.size();
YamlBF.ExecCount = BF.getKnownExecutionCount();
for (const BinaryBasicBlock *BB : BF.dfs()) {
yaml::bolt::BinaryBasicBlockProfile YamlBB;
YamlBB.Index = BB->getLayoutIndex();
YamlBB.NumInstructions = BB->getNumNonPseudos();
if (!LBRProfile) {
YamlBB.EventCount = BB->getKnownExecutionCount();
if (YamlBB.EventCount)
YamlBF.Blocks.emplace_back(YamlBB);
continue;
}
YamlBB.ExecCount = BB->getKnownExecutionCount();
for (const MCInst &Instr : *BB) {
if (!BC.MIB->isCall(Instr) && !BC.MIB->isIndirectBranch(Instr))
continue;
yaml::bolt::CallSiteInfo CSI;
Optional<uint32_t> Offset = BC.MIB->getOffset(Instr);
if (!Offset || *Offset < BB->getInputOffset())
continue;
CSI.Offset = *Offset - BB->getInputOffset();
if (BC.MIB->isIndirectCall(Instr) || BC.MIB->isIndirectBranch(Instr)) {
const auto ICSP = BC.MIB->tryGetAnnotationAs<IndirectCallSiteProfile>(
Instr, "CallProfile");
if (!ICSP)
continue;
for (const IndirectCallProfile &CSP : ICSP.get()) {
CSI.DestId = 0; // designated for unknown functions
CSI.EntryDiscriminator = 0;
if (CSP.Symbol) {
const BinaryFunction *Callee = BC.getFunctionForSymbol(CSP.Symbol);
if (Callee)
CSI.DestId = Callee->getFunctionNumber();
}
CSI.Count = CSP.Count;
CSI.Mispreds = CSP.Mispreds;
YamlBB.CallSites.push_back(CSI);
}
} else { // direct call or a tail call
uint64_t EntryID = 0;
const MCSymbol *CalleeSymbol = BC.MIB->getTargetSymbol(Instr);
const BinaryFunction *const Callee =
BC.getFunctionForSymbol(CalleeSymbol, &EntryID);
if (Callee) {
CSI.DestId = Callee->getFunctionNumber();
CSI.EntryDiscriminator = EntryID;
}
if (BC.MIB->getConditionalTailCall(Instr)) {
auto CTCCount =
BC.MIB->tryGetAnnotationAs<uint64_t>(Instr, "CTCTakenCount");
if (CTCCount) {
CSI.Count = *CTCCount;
auto CTCMispreds =
BC.MIB->tryGetAnnotationAs<uint64_t>(Instr, "CTCMispredCount");
if (CTCMispreds)
CSI.Mispreds = *CTCMispreds;
}
} else {
auto Count = BC.MIB->tryGetAnnotationAs<uint64_t>(Instr, "Count");
if (Count)
CSI.Count = *Count;
}
if (CSI.Count)
YamlBB.CallSites.emplace_back(CSI);
}
}
std::sort(YamlBB.CallSites.begin(), YamlBB.CallSites.end());
// Skip printing if there's no profile data for non-entry basic block.
// Include landing pads with non-zero execution count.
if (YamlBB.CallSites.empty() && !BB->isEntryPoint() &&
!(BB->isLandingPad() && BB->getKnownExecutionCount() != 0)) {
uint64_t SuccessorExecCount = 0;
for (const BinaryBasicBlock::BinaryBranchInfo &BranchInfo :
BB->branch_info())
SuccessorExecCount += BranchInfo.Count;
if (!SuccessorExecCount)
continue;
}
auto BranchInfo = BB->branch_info_begin();
for (const BinaryBasicBlock *Successor : BB->successors()) {
yaml::bolt::SuccessorInfo YamlSI;
YamlSI.Index = Successor->getLayoutIndex();
YamlSI.Count = BranchInfo->Count;
YamlSI.Mispreds = BranchInfo->MispredictedCount;
YamlBB.Successors.emplace_back(YamlSI);
++BranchInfo;
}
YamlBF.Blocks.emplace_back(YamlBB);
}
}
} // end anonymous namespace
std::error_code YAMLProfileWriter::writeProfile(const RewriteInstance &RI) {
const BinaryContext &BC = RI.getBinaryContext();
const auto &Functions = BC.getBinaryFunctions();
std::error_code EC;
OS = std::make_unique<raw_fd_ostream>(Filename, EC, sys::fs::OF_None);
if (EC) {
errs() << "BOLT-WARNING: " << EC.message() << " : unable to open "
<< Filename << " for output.\n";
return EC;
}
yaml::bolt::BinaryProfile BP;
// Fill out the header info.
BP.Header.Version = 1;
BP.Header.FileName = std::string(BC.getFilename());
Optional<StringRef> BuildID = BC.getFileBuildID();
BP.Header.Id = BuildID ? std::string(*BuildID) : "<unknown>";
BP.Header.Origin = std::string(RI.getProfileReader()->getReaderName());
StringSet<> EventNames = RI.getProfileReader()->getEventNames();
if (!EventNames.empty()) {
std::string Sep = "";
for (const StringMapEntry<NoneType> &EventEntry : EventNames) {
BP.Header.EventNames += Sep + EventEntry.first().str();
Sep = ",";
}
}
// Make sure the profile is consistent across all functions.
uint16_t ProfileFlags = BinaryFunction::PF_NONE;
for (const auto &BFI : Functions) {
const BinaryFunction &BF = BFI.second;
if (BF.hasProfile() && !BF.empty()) {
assert(BF.getProfileFlags() != BinaryFunction::PF_NONE);
if (ProfileFlags == BinaryFunction::PF_NONE)
ProfileFlags = BF.getProfileFlags();
assert(BF.getProfileFlags() == ProfileFlags &&
"expected consistent profile flags across all functions");
}
}
BP.Header.Flags = ProfileFlags;
// Add all function objects.
for (const auto &BFI : Functions) {
const BinaryFunction &BF = BFI.second;
if (BF.hasProfile()) {
if (!BF.hasValidProfile() && !RI.getProfileReader()->isTrustedSource())
continue;
yaml::bolt::BinaryFunctionProfile YamlBF;
convert(BF, YamlBF);
BP.Functions.emplace_back(YamlBF);
}
}
// Write the profile.
yaml::Output Out(*OS, nullptr, 0);
Out << BP;
return std::error_code();
}
} // namespace bolt
} // namespace llvm
|
