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//=-- InstrProf.cpp - Instrumented profiling format support -----------------=//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains support for clang's instrumentation based PGO and
// coverage.
//
//===----------------------------------------------------------------------===//
#include "llvm/IR/Constants.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/ProfileData/InstrProf.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/ManagedStatic.h"
using namespace llvm;
namespace {
class InstrProfErrorCategoryType : public std::error_category {
const char *name() const LLVM_NOEXCEPT override { return "llvm.instrprof"; }
std::string message(int IE) const override {
instrprof_error E = static_cast<instrprof_error>(IE);
switch (E) {
case instrprof_error::success:
return "Success";
case instrprof_error::eof:
return "End of File";
case instrprof_error::bad_magic:
return "Invalid profile data (bad magic)";
case instrprof_error::bad_header:
return "Invalid profile data (file header is corrupt)";
case instrprof_error::unsupported_version:
return "Unsupported profiling format version";
case instrprof_error::unsupported_hash_type:
return "Unsupported profiling hash";
case instrprof_error::too_large:
return "Too much profile data";
case instrprof_error::truncated:
return "Truncated profile data";
case instrprof_error::malformed:
return "Malformed profile data";
case instrprof_error::unknown_function:
return "No profile data available for function";
case instrprof_error::hash_mismatch:
return "Function hash mismatch";
case instrprof_error::count_mismatch:
return "Function count mismatch";
case instrprof_error::counter_overflow:
return "Counter overflow";
case instrprof_error::value_site_count_mismatch:
return "Function's value site counts mismatch";
}
llvm_unreachable("A value of instrprof_error has no message.");
}
};
}
static ManagedStatic<InstrProfErrorCategoryType> ErrorCategory;
const std::error_category &llvm::instrprof_category() {
return *ErrorCategory;
}
namespace llvm {
std::string getPGOFuncName(StringRef RawFuncName,
GlobalValue::LinkageTypes Linkage,
StringRef FileName) {
// Function names may be prefixed with a binary '1' to indicate
// that the backend should not modify the symbols due to any platform
// naming convention. Do not include that '1' in the PGO profile name.
if (RawFuncName[0] == '\1')
RawFuncName = RawFuncName.substr(1);
std::string FuncName = RawFuncName;
if (llvm::GlobalValue::isLocalLinkage(Linkage)) {
// For local symbols, prepend the main file name to distinguish them.
// Do not include the full path in the file name since there's no guarantee
// that it will stay the same, e.g., if the files are checked out from
// version control in different locations.
if (FileName.empty())
FuncName = FuncName.insert(0, "<unknown>:");
else
FuncName = FuncName.insert(0, FileName.str() + ":");
}
return FuncName;
}
std::string getPGOFuncName(const Function &F) {
return getPGOFuncName(F.getName(), F.getLinkage(), F.getParent()->getName());
}
GlobalVariable *createPGOFuncNameVar(Module &M,
GlobalValue::LinkageTypes Linkage,
StringRef FuncName) {
// We generally want to match the function's linkage, but available_externally
// and extern_weak both have the wrong semantics, and anything that doesn't
// need to link across compilation units doesn't need to be visible at all.
if (Linkage == GlobalValue::ExternalWeakLinkage)
Linkage = GlobalValue::LinkOnceAnyLinkage;
else if (Linkage == GlobalValue::AvailableExternallyLinkage)
Linkage = GlobalValue::LinkOnceODRLinkage;
else if (Linkage == GlobalValue::InternalLinkage ||
Linkage == GlobalValue::ExternalLinkage)
Linkage = GlobalValue::PrivateLinkage;
auto *Value = ConstantDataArray::getString(M.getContext(), FuncName, false);
auto FuncNameVar =
new GlobalVariable(M, Value->getType(), true, Linkage, Value,
Twine(getInstrProfNameVarPrefix()) + FuncName);
// Hide the symbol so that we correctly get a copy for each executable.
if (!GlobalValue::isLocalLinkage(FuncNameVar->getLinkage()))
FuncNameVar->setVisibility(GlobalValue::HiddenVisibility);
return FuncNameVar;
}
GlobalVariable *createPGOFuncNameVar(Function &F, StringRef FuncName) {
return createPGOFuncNameVar(*F.getParent(), F.getLinkage(), FuncName);
}
}
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