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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 "llvm/ExecutionEngine/JITEventListener.h"
#define DEBUG_TYPE "oprofile-jit-event-listener"
#include "llvm/DebugInfo.h"
#include "llvm/IR/Function.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/ExecutionEngine/OProfileWrapper.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/Errno.h"
#include "EventListenerCommon.h"
#include <dirent.h>
#include <fcntl.h>
using namespace llvm;
using namespace llvm::jitprofiling;
namespace {
class OProfileJITEventListener : public JITEventListener {
OProfileWrapper& Wrapper;
void initialize();
public:
OProfileJITEventListener(OProfileWrapper& LibraryWrapper)
: Wrapper(LibraryWrapper) {
initialize();
}
~OProfileJITEventListener();
virtual void NotifyFunctionEmitted(const Function &F,
void *FnStart, size_t FnSize,
const JITEvent_EmittedFunctionDetails &Details);
virtual void NotifyFreeingMachineCode(void *OldPtr);
};
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");
}
}
}
static debug_line_info LineStartToOProfileFormat(
const MachineFunction &MF, FilenameCache &Filenames,
uintptr_t Address, DebugLoc Loc) {
debug_line_info Result;
Result.vma = Address;
Result.lineno = Loc.getLine();
Result.filename = Filenames.getFilename(
Loc.getScope(MF.getFunction()->getContext()));
DEBUG(dbgs() << "Mapping " << reinterpret_cast<void*>(Result.vma) << " to "
<< Result.filename << ":" << Result.lineno << "\n");
return Result;
}
// Adds the just-emitted function to the symbol table.
void OProfileJITEventListener::NotifyFunctionEmitted(
const Function &F, void *FnStart, size_t FnSize,
const JITEvent_EmittedFunctionDetails &Details) {
assert(F.hasName() && FnStart != 0 && "Bad symbol to add");
if (Wrapper.op_write_native_code(F.getName().data(),
reinterpret_cast<uint64_t>(FnStart),
FnStart, FnSize) == -1) {
DEBUG(dbgs() << "Failed to tell OProfile about native function "
<< F.getName() << " at ["
<< FnStart << "-" << ((char*)FnStart + FnSize) << "]\n");
return;
}
if (!Details.LineStarts.empty()) {
// Now we convert the line number information from the address/DebugLoc
// format in Details to the address/filename/lineno format that OProfile
// expects. Note that OProfile 0.9.4 has a bug that causes it to ignore
// line numbers for addresses above 4G.
FilenameCache Filenames;
std::vector<debug_line_info> LineInfo;
LineInfo.reserve(1 + Details.LineStarts.size());
DebugLoc FirstLoc = Details.LineStarts[0].Loc;
assert(!FirstLoc.isUnknown()
&& "LineStarts should not contain unknown DebugLocs");
MDNode *FirstLocScope = FirstLoc.getScope(F.getContext());
DISubprogram FunctionDI = getDISubprogram(FirstLocScope);
if (FunctionDI.Verify()) {
// If we have debug info for the function itself, use that as the line
// number of the first several instructions. Otherwise, after filling
// LineInfo, we'll adjust the address of the first line number to point at
// the start of the function.
debug_line_info line_info;
line_info.vma = reinterpret_cast<uintptr_t>(FnStart);
line_info.lineno = FunctionDI.getLineNumber();
line_info.filename = Filenames.getFilename(FirstLocScope);
LineInfo.push_back(line_info);
}
for (std::vector<EmittedFunctionDetails::LineStart>::const_iterator
I = Details.LineStarts.begin(), E = Details.LineStarts.end();
I != E; ++I) {
LineInfo.push_back(LineStartToOProfileFormat(
*Details.MF, Filenames, I->Address, I->Loc));
}
// In case the function didn't have line info of its own, adjust the first
// line info's address to include the start of the function.
LineInfo[0].vma = reinterpret_cast<uintptr_t>(FnStart);
if (Wrapper.op_write_debug_line_info(FnStart, LineInfo.size(),
&*LineInfo.begin()) == -1) {
DEBUG(dbgs()
<< "Failed to tell OProfile about line numbers for native function "
<< F.getName() << " at ["
<< FnStart << "-" << ((char*)FnStart + FnSize) << "]\n");
}
}
}
// Removes the being-deleted function from the symbol table.
void OProfileJITEventListener::NotifyFreeingMachineCode(void *FnStart) {
assert(FnStart && "Invalid function pointer");
if (Wrapper.op_unload_native_code(reinterpret_cast<uint64_t>(FnStart)) == -1) {
DEBUG(dbgs()
<< "Failed to tell OProfile about unload of native function at "
<< FnStart << "\n");
}
}
} // anonymous namespace.
namespace llvm {
JITEventListener *JITEventListener::createOProfileJITEventListener() {
static OwningPtr<OProfileWrapper> JITProfilingWrapper(new OProfileWrapper);
return new OProfileJITEventListener(*JITProfilingWrapper);
}
// for testing
JITEventListener *JITEventListener::createOProfileJITEventListener(
OProfileWrapper* TestImpl) {
return new OProfileJITEventListener(*TestImpl);
}
} // namespace llvm
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