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[PGO] Refactor PGOFuncName meta data code to be used in clang

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Refactor the code that gets and creates PGOFuncName meta data so that it can be
used in clang's value profile annotation.

Differential Revision: http://reviews.llvm.org/D18623





git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265149 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rong Xu 2016-04-01 16:43:30 +00:00
parent fb73eb7749
commit a7f5174cd1
3 changed files with 30 additions and 12 deletions
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14
include/llvm/ProfileData/InstrProf.h
View File

@ -19,7 +19,9 @@
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/Metadata.h"
#include "llvm/ProfileData/InstrProfData.inc"
#include "llvm/ProfileData/ProfileCommon.h"
#include "llvm/Support/Endian.h"
@ -245,6 +247,18 @@ bool getValueProfDataFromInst(const Instruction &Inst,
InstrProfValueData ValueData[],
uint32_t &ActualNumValueData, uint64_t &TotalC);
inline StringRef getPGOFuncNameMetadataName() { return "PGOFuncName"; }
/// Return the PGOFuncName meta data associated with a function.
inline MDNode *getPGOFuncNameMetadata(const Function &F) {
return F.getMetadata(getPGOFuncNameMetadataName());
}
/// Create the PGOFuncName meta data if PGOFuncName is different from
/// function's raw name. This should only apply to internal linkage functions
/// declared by users only.
void createPGOFuncNameMetadata(Function &F);
const std::error_category &instrprof_category();
enum class instrprof_error {

18
lib/ProfileData/InstrProf.cpp
View File

@ -98,9 +98,8 @@ std::string getPGOFuncName(const Function &F, bool InLTO, uint64_t Version) {
return getPGOFuncName(F.getName(), F.getLinkage(), F.getParent()->getName(),
Version);
// InLTO mode. First check if these is a meta data.
MDNode *MD = F.getMetadata("PGOFuncName");
if (MD != nullptr) {
// In LTO mode (when InLTO is true), first check if there is a meta data.
if (MDNode *MD = getPGOFuncNameMetadata(F)) {
StringRef S = cast<MDString>(MD->getOperand(0))->getString();
return S.str();
}
@ -108,7 +107,7 @@ std::string getPGOFuncName(const Function &F, bool InLTO, uint64_t Version) {
// If there is no meta data, the function must be a global before the value
// profile annotation pass. Its current linkage may be internal if it is
// internalized in LTO mode.
return getPGOFuncName (F.getName(), GlobalValue::ExternalLinkage, "");
return getPGOFuncName(F.getName(), GlobalValue::ExternalLinkage, "");
}
StringRef getFuncNameWithoutPrefix(StringRef PGOFuncName, StringRef FileName) {
@ -720,4 +719,15 @@ bool getValueProfDataFromInst(const Instruction &Inst,
}
return true;
}
void createPGOFuncNameMetadata(Function &F) {
const std::string &FuncName = getPGOFuncName(F);
if (FuncName == F.getName())
return;
LLVMContext &C = F.getContext();
MDNode *N = MDNode::get(C, MDString::get(C, FuncName.c_str()));
F.setMetadata(getPGOFuncNameMetadataName(), N);
}
} // end namespace llvm

10
lib/Transforms/Instrumentation/PGOInstrumentation.cpp
View File

@ -752,14 +752,8 @@ void PGOUseFunc::annotateIndirectCallSites() {
if (DisableValueProfiling)
return;
// Write out the PGOFuncName if this is different from it's raw name.
// This should only apply to internal linkage functions only.
const std::string &FuncName = getPGOFuncName(F);
if (FuncName != F.getName()) {
LLVMContext &C = F.getContext();
MDNode *N = MDNode::get(C, MDString::get(C, FuncName.c_str()));
F.setMetadata("PGOFuncName", N);
}
// Create the PGOFuncName meta data.
createPGOFuncNameMetadata(F);
unsigned IndirectCallSiteIndex = 0;
PGOIndirectCallSiteVisitor ICV;