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Recommit r335794 "Add support for generating a call graph profile from Branch Frequency Info." with fix for removed functions.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@337140 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael J. Spencer
2018-07-16 00:28:24 +00:00
parent 0ad50ac3b8
commit 3da6ce5ebe
13 changed files with 339 additions and 7 deletions
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lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+53 -7
View File
@@ -91,6 +91,12 @@ static void GetObjCImageInfo(Module &M, unsigned &Version, unsigned &Flags,
// ELF
//===----------------------------------------------------------------------===//
void TargetLoweringObjectFileELF::Initialize(MCContext &Ctx,
const TargetMachine &TgtM) {
TargetLoweringObjectFile::Initialize(Ctx, TgtM);
TM = &TgtM;
}
void TargetLoweringObjectFileELF::emitModuleMetadata(MCStreamer &Streamer,
Module &M) const {
auto &C = getContext();
@@ -116,15 +122,55 @@ void TargetLoweringObjectFileELF::emitModuleMetadata(MCStreamer &Streamer,
StringRef Section;
GetObjCImageInfo(M, Version, Flags, Section);
if (Section.empty())
if (!Section.empty()) {
auto *S = C.getELFSection(Section, ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
Streamer.SwitchSection(S);
Streamer.EmitLabel(C.getOrCreateSymbol(StringRef("OBJC_IMAGE_INFO")));
Streamer.EmitIntValue(Version, 4);
Streamer.EmitIntValue(Flags, 4);
Streamer.AddBlankLine();
}
SmallVector<Module::ModuleFlagEntry, 8> ModuleFlags;
M.getModuleFlagsMetadata(ModuleFlags);
MDNode *CFGProfile = nullptr;
for (const auto &MFE : ModuleFlags) {
StringRef Key = MFE.Key->getString();
if (Key == "CG Profile") {
CFGProfile = cast<MDNode>(MFE.Val);
break;
}
}
if (!CFGProfile)
return;
auto *S = C.getELFSection(Section, ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
Streamer.SwitchSection(S);
Streamer.EmitLabel(C.getOrCreateSymbol(StringRef("OBJC_IMAGE_INFO")));
Streamer.EmitIntValue(Version, 4);
Streamer.EmitIntValue(Flags, 4);
Streamer.AddBlankLine();
auto GetSym = [this](const MDOperand &MDO) -> MCSymbol * {
if (!MDO)
return nullptr;
auto V = cast<ValueAsMetadata>(MDO);
const Function *F = cast<Function>(V->getValue());
return TM->getSymbol(F);
};
for (const auto &Edge : CFGProfile->operands()) {
MDNode *E = cast<MDNode>(Edge);
const MCSymbol *From = GetSym(E->getOperand(0));
const MCSymbol *To = GetSym(E->getOperand(1));
// Skip null functions. This can happen if functions are dead stripped after
// the CGProfile pass has been run.
if (!From || !To)
continue;
uint64_t Count = cast<ConstantAsMetadata>(E->getOperand(2))
->getValue()
->getUniqueInteger()
.getZExtValue();
Streamer.emitCGProfileEntry(
MCSymbolRefExpr::create(From, MCSymbolRefExpr::VK_None, C),
MCSymbolRefExpr::create(To, MCSymbolRefExpr::VK_None, C), Count);
}
}
MCSymbol *TargetLoweringObjectFileELF::getCFIPersonalitySymbol(