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//===-- OProfileJITEventListener.cpp - Tell OProfile about JITted code ----===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines a JITEventListener object that uses OProfileWrapper to tell
// oprofile about JITted functions, including source line information.
//
//===----------------------------------------------------------------------===//
#include "llvm-c/ExecutionEngine.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/Config/config.h"
#include "llvm/DebugInfo/DWARF/DWARFContext.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/Object/SymbolSize.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::object;
#define DEBUG_TYPE "oprofile-jit-event-listener"
namespace {
class OProfileJITEventListener : public JITEventListener {
std::unique_ptr<OProfileWrapper> Wrapper;
void initialize();
std::map<ObjectKey, OwningBinary<ObjectFile>> DebugObjects;
public:
OProfileJITEventListener(std::unique_ptr<OProfileWrapper> LibraryWrapper)
: Wrapper(std::move(LibraryWrapper)) {
initialize();
}
~OProfileJITEventListener();
void notifyObjectLoaded(ObjectKey Key, const ObjectFile &Obj,
const RuntimeDyld::LoadedObjectInfo &L) override;
void notifyFreeingObject(ObjectKey Key) override;
};
void OProfileJITEventListener::initialize() {
if (!Wrapper->op_open_agent()) {
const std::string err_str = sys::StrError();
LLVM_DEBUG(dbgs() << "Failed to connect to OProfile agent: " << err_str
<< "\n");
} else {
LLVM_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();
LLVM_DEBUG(dbgs() << "Failed to disconnect from OProfile agent: "
<< err_str << "\n");
} else {
LLVM_DEBUG(dbgs() << "Disconnected from OProfile agent.\n");
}
}
}
void OProfileJITEventListener::notifyObjectLoaded(
ObjectKey Key, const ObjectFile &Obj,
const RuntimeDyld::LoadedObjectInfo &L) {
if (!Wrapper->isAgentAvailable()) {
return;
}
OwningBinary<ObjectFile> DebugObjOwner = L.getObjectForDebug(Obj);
const ObjectFile &DebugObj = *DebugObjOwner.getBinary();
std::unique_ptr<DIContext> Context = DWARFContext::create(DebugObj);
// Use symbol info to iterate functions in the object.
for (const std::pair<SymbolRef, uint64_t> &P : computeSymbolSizes(DebugObj)) {
SymbolRef Sym = P.first;
if (!Sym.getType() || *Sym.getType() != SymbolRef::ST_Function)
continue;
Expected<StringRef> NameOrErr = Sym.getName();
if (!NameOrErr)
continue;
StringRef Name = *NameOrErr;
Expected<uint64_t> AddrOrErr = Sym.getAddress();
if (!AddrOrErr)
continue;
uint64_t Addr = *AddrOrErr;
uint64_t Size = P.second;
if (Wrapper->op_write_native_code(Name.data(), Addr, (void *)Addr, Size) ==
-1) {
LLVM_DEBUG(dbgs() << "Failed to tell OProfile about native function "
<< Name << " at [" << (void *)Addr << "-"
<< ((char *)Addr + Size) << "]\n");
continue;
}
DILineInfoTable Lines = Context->getLineInfoForAddressRange(Addr, Size);
size_t i = 0;
size_t num_entries = Lines.size();
struct debug_line_info *debug_line;
debug_line = (struct debug_line_info *)calloc(
num_entries, sizeof(struct debug_line_info));
for (auto& It : Lines) {
debug_line[i].vma = (unsigned long)It.first;
debug_line[i].lineno = It.second.Line;
debug_line[i].filename =
const_cast<char *>(Lines.front().second.FileName.c_str());
++i;
}
if (Wrapper->op_write_debug_line_info((void *)Addr, num_entries,
debug_line) == -1) {
LLVM_DEBUG(dbgs() << "Failed to tell OProfiler about debug object at ["
<< (void *)Addr << "-" << ((char *)Addr + Size)
<< "]\n");
continue;
}
}
DebugObjects[Key] = std::move(DebugObjOwner);
}
void OProfileJITEventListener::notifyFreeingObject(ObjectKey Key) {
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(Key) == DebugObjects.end())
return;
const ObjectFile &DebugObj = *DebugObjects[Key].getBinary();
// Use symbol info to iterate functions in the object.
for (symbol_iterator I = DebugObj.symbol_begin(),
E = DebugObj.symbol_end();
I != E; ++I) {
if (I->getType() && *I->getType() == SymbolRef::ST_Function) {
Expected<uint64_t> AddrOrErr = I->getAddress();
if (!AddrOrErr)
continue;
uint64_t Addr = *AddrOrErr;
if (Wrapper->op_unload_native_code(Addr) == -1) {
LLVM_DEBUG(
dbgs()
<< "Failed to tell OProfile about unload of native function at "
<< (void *)Addr << "\n");
continue;
}
}
}
}
DebugObjects.erase(Key);
}
} // anonymous namespace.
namespace llvm {
JITEventListener *JITEventListener::createOProfileJITEventListener() {
return new OProfileJITEventListener(llvm::make_unique<OProfileWrapper>());
}
} // namespace llvm
LLVMJITEventListenerRef LLVMCreateOProfileJITEventListener(void)
{
return wrap(JITEventListener::createOProfileJITEventListener());
}
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