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//===-- IntelJITEventListener.cpp - Tell Intel profiler about JITed 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 to tell Intel(R) VTune(TM)
// Amplifier XE 2011 about JITted functions.
//
//===----------------------------------------------------------------------===//
#include "llvm/Config/config.h"
#include "IntelJITEventsWrapper.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/DebugInfo/DWARF/DIContext.h"
#include "llvm/ExecutionEngine/JITEventListener.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Metadata.h"
#include "llvm/IR/ValueHandle.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Errno.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
using namespace llvm::object;
#define DEBUG_TYPE "amplifier-jit-event-listener"
namespace {
class IntelJITEventListener : public JITEventListener {
typedef DenseMap<void*, unsigned int> MethodIDMap;
std::unique_ptr<IntelJITEventsWrapper> Wrapper;
MethodIDMap MethodIDs;
typedef SmallVector<const void *, 64> MethodAddressVector;
typedef DenseMap<const void *, MethodAddressVector> ObjectMap;
ObjectMap LoadedObjectMap;
std::map<const char*, OwningBinary<ObjectFile>> DebugObjects;
public:
IntelJITEventListener(IntelJITEventsWrapper* libraryWrapper) {
Wrapper.reset(libraryWrapper);
}
~IntelJITEventListener() {
}
void NotifyObjectEmitted(const ObjectFile &Obj,
const RuntimeDyld::LoadedObjectInfo &L) override;
void NotifyFreeingObject(const ObjectFile &Obj) override;
};
static LineNumberInfo DILineInfoToIntelJITFormat(uintptr_t StartAddress,
uintptr_t Address,
DILineInfo Line) {
LineNumberInfo Result;
Result.Offset = Address - StartAddress;
Result.LineNumber = Line.Line;
return Result;
}
static iJIT_Method_Load FunctionDescToIntelJITFormat(
IntelJITEventsWrapper& Wrapper,
const char* FnName,
uintptr_t FnStart,
size_t FnSize) {
iJIT_Method_Load Result;
memset(&Result, 0, sizeof(iJIT_Method_Load));
Result.method_id = Wrapper.iJIT_GetNewMethodID();
Result.method_name = const_cast<char*>(FnName);
Result.method_load_address = reinterpret_cast<void*>(FnStart);
Result.method_size = FnSize;
Result.class_id = 0;
Result.class_file_name = NULL;
Result.user_data = NULL;
Result.user_data_size = 0;
Result.env = iJDE_JittingAPI;
return Result;
}
void IntelJITEventListener::NotifyObjectEmitted(
const ObjectFile &Obj,
const RuntimeDyld::LoadedObjectInfo &L) {
OwningBinary<ObjectFile> DebugObjOwner = L.getObjectForDebug(Obj);
const ObjectFile &DebugObj = *DebugObjOwner.getBinary();
// Get the address of the object image for use as a unique identifier
const void* ObjData = DebugObj.getData().data();
DIContext* Context = DIContext::getDWARFContext(DebugObj);
MethodAddressVector Functions;
// Use symbol info to iterate functions in the object.
for (symbol_iterator I = DebugObj.symbol_begin(),
E = DebugObj.symbol_end();
I != E;
++I) {
std::vector<LineNumberInfo> LineInfo;
std::string SourceFileName;
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;
// Record this address in a local vector
Functions.push_back((void*)Addr);
// Build the function loaded notification message
iJIT_Method_Load FunctionMessage = FunctionDescToIntelJITFormat(*Wrapper,
Name.data(),
Addr,
Size);
if (Context) {
DILineInfoTable Lines = Context->getLineInfoForAddressRange(Addr, Size);
DILineInfoTable::iterator Begin = Lines.begin();
DILineInfoTable::iterator End = Lines.end();
for (DILineInfoTable::iterator It = Begin; It != End; ++It) {
LineInfo.push_back(DILineInfoToIntelJITFormat((uintptr_t)Addr,
It->first,
It->second));
}
if (LineInfo.size() == 0) {
FunctionMessage.source_file_name = 0;
FunctionMessage.line_number_size = 0;
FunctionMessage.line_number_table = 0;
} else {
// Source line information for the address range is provided as
// a code offset for the start of the corresponding sub-range and
// a source line. JIT API treats offsets in LineNumberInfo structures
// as the end of the corresponding code region. The start of the code
// is taken from the previous element. Need to shift the elements.
LineNumberInfo last = LineInfo.back();
last.Offset = FunctionMessage.method_size;
LineInfo.push_back(last);
for (size_t i = LineInfo.size() - 2; i > 0; --i)
LineInfo[i].LineNumber = LineInfo[i - 1].LineNumber;
SourceFileName = Lines.front().second.FileName;
FunctionMessage.source_file_name = const_cast<char *>(SourceFileName.c_str());
FunctionMessage.line_number_size = LineInfo.size();
FunctionMessage.line_number_table = &*LineInfo.begin();
}
} else {
FunctionMessage.source_file_name = 0;
FunctionMessage.line_number_size = 0;
FunctionMessage.line_number_table = 0;
}
Wrapper->iJIT_NotifyEvent(iJVM_EVENT_TYPE_METHOD_LOAD_FINISHED,
&FunctionMessage);
MethodIDs[(void*)Addr] = FunctionMessage.method_id;
}
}
// To support object unload notification, we need to keep a list of
// registered function addresses for each loaded object. We will
// use the MethodIDs map to get the registered ID for each function.
LoadedObjectMap[ObjData] = Functions;
DebugObjects[Obj.getData().data()] = std::move(DebugObjOwner);
}
void IntelJITEventListener::NotifyFreeingObject(const ObjectFile &Obj) {
// This object may not have been registered with the listener. If it wasn't,
// bail out.
if (DebugObjects.find(Obj.getData().data()) == DebugObjects.end())
return;
// Get the address of the object image for use as a unique identifier
const ObjectFile &DebugObj = *DebugObjects[Obj.getData().data()].getBinary();
const void* ObjData = DebugObj.getData().data();
// Get the object's function list from LoadedObjectMap
ObjectMap::iterator OI = LoadedObjectMap.find(ObjData);
if (OI == LoadedObjectMap.end())
return;
MethodAddressVector& Functions = OI->second;
// Walk the function list, unregistering each function
for (MethodAddressVector::iterator FI = Functions.begin(),
FE = Functions.end();
FI != FE;
++FI) {
void* FnStart = const_cast<void*>(*FI);
MethodIDMap::iterator MI = MethodIDs.find(FnStart);
if (MI != MethodIDs.end()) {
Wrapper->iJIT_NotifyEvent(iJVM_EVENT_TYPE_METHOD_UNLOAD_START,
&MI->second);
MethodIDs.erase(MI);
}
}
// Erase the object from LoadedObjectMap
LoadedObjectMap.erase(OI);
DebugObjects.erase(Obj.getData().data());
}
} // anonymous namespace.
namespace llvm {
JITEventListener *JITEventListener::createIntelJITEventListener() {
return new IntelJITEventListener(new IntelJITEventsWrapper);
}
// for testing
JITEventListener *JITEventListener::createIntelJITEventListener(
IntelJITEventsWrapper* TestImpl) {
return new IntelJITEventListener(TestImpl);
}
} // namespace llvm
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