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//===-- OProfileJITEventListener.cpp - Tell OProfile about JITted code ----===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines a JITEventListener object that uses OProfileWrapper to tell
// oprofile about JITted functions, including source line information.
//
//===----------------------------------------------------------------------===//
#include "llvm/Config/config.h"
#include "EventListenerCommon.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/ExecutionEngine/JITEventListener.h"
#include "llvm/ExecutionEngine/OProfileWrapper.h"
#include "llvm/ExecutionEngine/RuntimeDyld.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/Function.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Errno.h"
#include "llvm/Support/raw_ostream.h"
#include <dirent.h>
#include <fcntl.h>
using namespace llvm;
using namespace llvm::jitprofiling;
using namespace llvm::object;
#define DEBUG_TYPE "oprofile-jit-event-listener"
namespace {
class OProfileJITEventListener : public JITEventListener {
std::unique_ptr<OProfileWrapper> Wrapper;
void initialize();
std::map<const char*, OwningBinary<ObjectFile>> DebugObjects;
public:
OProfileJITEventListener(std::unique_ptr<OProfileWrapper> LibraryWrapper)
: Wrapper(std::move(LibraryWrapper)) {
initialize();
}
~OProfileJITEventListener();
void NotifyObjectEmitted(const ObjectFile &Obj,
const RuntimeDyld::LoadedObjectInfo &L) override;
void NotifyFreeingObject(const ObjectFile &Obj) override;
};
void OProfileJITEventListener::initialize() {
if (!Wrapper->op_open_agent()) {
const std::string err_str = sys::StrError();
DEBUG(dbgs() << "Failed to connect to OProfile agent: " << err_str << "\n");
} else {
DEBUG(dbgs() << "Connected to OProfile agent.\n");
}
}
OProfileJITEventListener::~OProfileJITEventListener() {
if (Wrapper->isAgentAvailable()) {
if (Wrapper->op_close_agent() == -1) {
const std::string err_str = sys::StrError();
DEBUG(dbgs() << "Failed to disconnect from OProfile agent: "
<< err_str << "\n");
} else {
DEBUG(dbgs() << "Disconnected from OProfile agent.\n");
}
}
}
void OProfileJITEventListener::NotifyObjectEmitted(
const ObjectFile &Obj,
const RuntimeDyld::LoadedObjectInfo &L) {
if (!Wrapper->isAgentAvailable()) {
return;
}
OwningBinary<ObjectFile> DebugObjOwner = L.getObjectForDebug(Obj);
const ObjectFile &DebugObj = *DebugObjOwner.getBinary();
// Use symbol info to iterate functions in the object.
for (symbol_iterator I = DebugObj.symbol_begin(), E = DebugObj.symbol_end();
I != E; ++I) {
SymbolRef::Type SymType;
if (I->getType(SymType)) continue;
if (SymType == SymbolRef::ST_Function) {
StringRef Name;
uint64_t Addr;
uint64_t Size;
if (I->getName(Name)) continue;
if (I->getAddress(Addr)) continue;
if (I->getSize(Size)) continue;
if (Wrapper->op_write_native_code(Name.data(), Addr, (void*)Addr, Size)
== -1) {
DEBUG(dbgs() << "Failed to tell OProfile about native function "
<< Name << " at ["
<< (void*)Addr << "-" << ((char*)Addr + Size) << "]\n");
continue;
}
// TODO: support line number info (similar to IntelJITEventListener.cpp)
}
}
DebugObjects[Obj.getData().data()] = std::move(DebugObjOwner);
}
void OProfileJITEventListener::NotifyFreeingObject(const ObjectFile &Obj) {
if (Wrapper->isAgentAvailable()) {
// If there was no agent registered when the original object was loaded then
// we won't have created a debug object for it, so bail out.
if (DebugObjects.find(Obj.getData().data()) == DebugObjects.end())
return;
const ObjectFile &DebugObj = *DebugObjects[Obj.getData().data()].getBinary();
// Use symbol info to iterate functions in the object.
for (symbol_iterator I = DebugObj.symbol_begin(),
E = DebugObj.symbol_end();
I != E; ++I) {
SymbolRef::Type SymType;
if (I->getType(SymType)) continue;
if (SymType == SymbolRef::ST_Function) {
uint64_t Addr;
if (I->getAddress(Addr)) continue;
if (Wrapper->op_unload_native_code(Addr) == -1) {
DEBUG(dbgs()
<< "Failed to tell OProfile about unload of native function at "
<< (void*)Addr << "\n");
continue;
}
}
}
}
DebugObjects.erase(Obj.getData().data());
}
} // anonymous namespace.
namespace llvm {
JITEventListener *JITEventListener::createOProfileJITEventListener() {
return new OProfileJITEventListener(llvm::make_unique<OProfileWrapper>());
}
} // namespace llvm
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