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Revert "Add support for generating a call graph profile from Branch Frequency Info."

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This reverts commits r335794 and r335797. Breaks ThinLTO+FDO selfhost.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@335851 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2018-06-28 13:15:03 +00:00
parent ee2becd704
commit 1bbef2cc89
13 changed files with 7 additions and 329 deletions
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lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+7 -47
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@@ -91,12 +91,6 @@ 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();
@@ -122,49 +116,15 @@ void TargetLoweringObjectFileELF::emitModuleMetadata(MCStreamer &Streamer,
StringRef Section;
GetObjCImageInfo(M, Version, Flags, Section);
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)
if (Section.empty())
return;
auto GetSym = [this](const MDOperand &MDO) {
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));
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);
}
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();
}
MCSymbol *TargetLoweringObjectFileELF::getCFIPersonalitySymbol(