228 строки
7.7 KiB
C++
228 строки
7.7 KiB
C++
//===-- IntelJITEventListener.cpp - Tell Intel profiler about JITed code --===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines a JITEventListener object to tell Intel(R) VTune(TM)
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// Amplifier XE 2011 about JITted functions.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Config/config.h"
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#include "IntelJITEventsWrapper.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/DebugInfo/DIContext.h"
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#include "llvm/DebugInfo/DWARF/DWARFContext.h"
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#include "llvm/ExecutionEngine/JITEventListener.h"
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#include "llvm/IR/DebugInfo.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/Metadata.h"
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#include "llvm/IR/ValueHandle.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Object/SymbolSize.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/Errno.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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using namespace llvm::object;
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#define DEBUG_TYPE "amplifier-jit-event-listener"
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namespace {
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class IntelJITEventListener : public JITEventListener {
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typedef DenseMap<void*, unsigned int> MethodIDMap;
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std::unique_ptr<IntelJITEventsWrapper> Wrapper;
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MethodIDMap MethodIDs;
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typedef SmallVector<const void *, 64> MethodAddressVector;
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typedef DenseMap<const void *, MethodAddressVector> ObjectMap;
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ObjectMap LoadedObjectMap;
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std::map<const char*, OwningBinary<ObjectFile>> DebugObjects;
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public:
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IntelJITEventListener(IntelJITEventsWrapper* libraryWrapper) {
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Wrapper.reset(libraryWrapper);
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}
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~IntelJITEventListener() {
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}
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void NotifyObjectEmitted(const ObjectFile &Obj,
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const RuntimeDyld::LoadedObjectInfo &L) override;
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void NotifyFreeingObject(const ObjectFile &Obj) override;
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};
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static LineNumberInfo DILineInfoToIntelJITFormat(uintptr_t StartAddress,
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uintptr_t Address,
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DILineInfo Line) {
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LineNumberInfo Result;
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Result.Offset = Address - StartAddress;
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Result.LineNumber = Line.Line;
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return Result;
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}
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static iJIT_Method_Load FunctionDescToIntelJITFormat(
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IntelJITEventsWrapper& Wrapper,
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const char* FnName,
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uintptr_t FnStart,
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size_t FnSize) {
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iJIT_Method_Load Result;
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memset(&Result, 0, sizeof(iJIT_Method_Load));
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Result.method_id = Wrapper.iJIT_GetNewMethodID();
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Result.method_name = const_cast<char*>(FnName);
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Result.method_load_address = reinterpret_cast<void*>(FnStart);
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Result.method_size = FnSize;
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Result.class_id = 0;
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Result.class_file_name = NULL;
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Result.user_data = NULL;
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Result.user_data_size = 0;
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Result.env = iJDE_JittingAPI;
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return Result;
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}
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void IntelJITEventListener::NotifyObjectEmitted(
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const ObjectFile &Obj,
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const RuntimeDyld::LoadedObjectInfo &L) {
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OwningBinary<ObjectFile> DebugObjOwner = L.getObjectForDebug(Obj);
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const ObjectFile &DebugObj = *DebugObjOwner.getBinary();
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// Get the address of the object image for use as a unique identifier
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const void* ObjData = DebugObj.getData().data();
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DIContext* Context = new DWARFContextInMemory(DebugObj);
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MethodAddressVector Functions;
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// Use symbol info to iterate functions in the object.
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for (const std::pair<SymbolRef, uint64_t> &P : computeSymbolSizes(DebugObj)) {
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SymbolRef Sym = P.first;
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std::vector<LineNumberInfo> LineInfo;
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std::string SourceFileName;
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if (Sym.getType() != SymbolRef::ST_Function)
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continue;
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ErrorOr<StringRef> Name = Sym.getName();
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if (!Name)
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continue;
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ErrorOr<uint64_t> AddrOrErr = Sym.getAddress();
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if (AddrOrErr.getError())
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continue;
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uint64_t Addr = *AddrOrErr;
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uint64_t Size = P.second;
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// Record this address in a local vector
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Functions.push_back((void*)Addr);
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// Build the function loaded notification message
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iJIT_Method_Load FunctionMessage =
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FunctionDescToIntelJITFormat(*Wrapper, Name->data(), Addr, Size);
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DILineInfoTable Lines = Context->getLineInfoForAddressRange(Addr, Size);
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DILineInfoTable::iterator Begin = Lines.begin();
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DILineInfoTable::iterator End = Lines.end();
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for (DILineInfoTable::iterator It = Begin; It != End; ++It) {
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LineInfo.push_back(
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DILineInfoToIntelJITFormat((uintptr_t)Addr, It->first, It->second));
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}
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if (LineInfo.size() == 0) {
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FunctionMessage.source_file_name = 0;
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FunctionMessage.line_number_size = 0;
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FunctionMessage.line_number_table = 0;
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} else {
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// Source line information for the address range is provided as
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// a code offset for the start of the corresponding sub-range and
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// a source line. JIT API treats offsets in LineNumberInfo structures
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// as the end of the corresponding code region. The start of the code
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// is taken from the previous element. Need to shift the elements.
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LineNumberInfo last = LineInfo.back();
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last.Offset = FunctionMessage.method_size;
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LineInfo.push_back(last);
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for (size_t i = LineInfo.size() - 2; i > 0; --i)
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LineInfo[i].LineNumber = LineInfo[i - 1].LineNumber;
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SourceFileName = Lines.front().second.FileName;
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FunctionMessage.source_file_name =
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const_cast<char *>(SourceFileName.c_str());
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FunctionMessage.line_number_size = LineInfo.size();
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FunctionMessage.line_number_table = &*LineInfo.begin();
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}
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Wrapper->iJIT_NotifyEvent(iJVM_EVENT_TYPE_METHOD_LOAD_FINISHED,
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&FunctionMessage);
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MethodIDs[(void*)Addr] = FunctionMessage.method_id;
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}
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// To support object unload notification, we need to keep a list of
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// registered function addresses for each loaded object. We will
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// use the MethodIDs map to get the registered ID for each function.
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LoadedObjectMap[ObjData] = Functions;
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DebugObjects[Obj.getData().data()] = std::move(DebugObjOwner);
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}
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void IntelJITEventListener::NotifyFreeingObject(const ObjectFile &Obj) {
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// This object may not have been registered with the listener. If it wasn't,
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// bail out.
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if (DebugObjects.find(Obj.getData().data()) == DebugObjects.end())
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return;
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// Get the address of the object image for use as a unique identifier
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const ObjectFile &DebugObj = *DebugObjects[Obj.getData().data()].getBinary();
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const void* ObjData = DebugObj.getData().data();
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// Get the object's function list from LoadedObjectMap
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ObjectMap::iterator OI = LoadedObjectMap.find(ObjData);
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if (OI == LoadedObjectMap.end())
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return;
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MethodAddressVector& Functions = OI->second;
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// Walk the function list, unregistering each function
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for (MethodAddressVector::iterator FI = Functions.begin(),
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FE = Functions.end();
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FI != FE;
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++FI) {
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void* FnStart = const_cast<void*>(*FI);
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MethodIDMap::iterator MI = MethodIDs.find(FnStart);
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if (MI != MethodIDs.end()) {
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Wrapper->iJIT_NotifyEvent(iJVM_EVENT_TYPE_METHOD_UNLOAD_START,
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&MI->second);
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MethodIDs.erase(MI);
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}
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}
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// Erase the object from LoadedObjectMap
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LoadedObjectMap.erase(OI);
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DebugObjects.erase(Obj.getData().data());
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}
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} // anonymous namespace.
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namespace llvm {
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JITEventListener *JITEventListener::createIntelJITEventListener() {
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return new IntelJITEventListener(new IntelJITEventsWrapper);
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}
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// for testing
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JITEventListener *JITEventListener::createIntelJITEventListener(
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IntelJITEventsWrapper* TestImpl) {
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return new IntelJITEventListener(TestImpl);
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}
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} // namespace llvm
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