src/llvm/lib/ExecutionEngine/IntelJITEvents/IntelJITEventListener.cpp

   1 //===-- IntelJITEventListener.cpp - Tell Intel profiler about JITed code --===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file defines a JITEventListener object to tell Intel(R) VTune(TM)
  11 // Amplifier XE 2011 about JITted functions.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "llvm/Config/config.h"
  16 #include "EventListenerCommon.h"
  17 #include "IntelJITEventsWrapper.h"
  18 #include "llvm/ADT/DenseMap.h"
  19 #include "llvm/CodeGen/MachineFunction.h"
  20 #include "llvm/DebugInfo/DIContext.h"
  21 #include "llvm/ExecutionEngine/JITEventListener.h"
  22 #include "llvm/IR/DebugInfo.h"
  23 #include "llvm/IR/Function.h"
  24 #include "llvm/IR/Metadata.h"
  25 #include "llvm/IR/ValueHandle.h"
  26 #include "llvm/Object/ObjectFile.h"
  27 #include "llvm/Support/Debug.h"
  28 #include "llvm/Support/Errno.h"
  29 #include "llvm/Support/raw_ostream.h"
  30
  31 using namespace llvm;
  32 using namespace llvm::jitprofiling;
  33 using namespace llvm::object;
  34
  35 #define DEBUG_TYPE "amplifier-jit-event-listener"
  36
  37 namespace {
  38
  39 class IntelJITEventListener : public JITEventListener {
  40   typedef DenseMap<void*, unsigned int> MethodIDMap;
  41
  42   std::unique_ptr<IntelJITEventsWrapper> Wrapper;
  43   MethodIDMap MethodIDs;
  44   FilenameCache Filenames;
  45
  46   typedef SmallVector<const void *, 64> MethodAddressVector;
  47   typedef DenseMap<const void *, MethodAddressVector>  ObjectMap;
  48
  49   ObjectMap  LoadedObjectMap;
  50   std::map<const char*, OwningBinary<ObjectFile>> DebugObjects;
  51
  52 public:
  53   IntelJITEventListener(IntelJITEventsWrapper* libraryWrapper) {
  54       Wrapper.reset(libraryWrapper);
  55   }
  56
  57   ~IntelJITEventListener() {
  58   }
  59
  60   void NotifyObjectEmitted(const ObjectFile &Obj,
  61                            const RuntimeDyld::LoadedObjectInfo &L) override;
  62
  63   void NotifyFreeingObject(const ObjectFile &Obj) override;
  64 };
  65
  66 static LineNumberInfo DILineInfoToIntelJITFormat(uintptr_t StartAddress,
  67                                                  uintptr_t Address,
  68                                                  DILineInfo Line) {
  69   LineNumberInfo Result;
  70
  71   Result.Offset = Address - StartAddress;
  72   Result.LineNumber = Line.Line;
  73
  74   return Result;
  75 }
  76
  77 static iJIT_Method_Load FunctionDescToIntelJITFormat(
  78     IntelJITEventsWrapper& Wrapper,
  79     const char* FnName,
  80     uintptr_t FnStart,
  81     size_t FnSize) {
  82   iJIT_Method_Load Result;
  83   memset(&Result, 0, sizeof(iJIT_Method_Load));
  84
  85   Result.method_id = Wrapper.iJIT_GetNewMethodID();
  86   Result.method_name = const_cast<char*>(FnName);
  87   Result.method_load_address = reinterpret_cast<void*>(FnStart);
  88   Result.method_size = FnSize;
  89
  90   Result.class_id = 0;
  91   Result.class_file_name = NULL;
  92   Result.user_data = NULL;
  93   Result.user_data_size = 0;
  94   Result.env = iJDE_JittingAPI;
  95
  96   return Result;
  97 }
  98
  99 void IntelJITEventListener::NotifyObjectEmitted(
 100                                        const ObjectFile &Obj,
 101                                        const RuntimeDyld::LoadedObjectInfo &L) {
 102
 103   OwningBinary<ObjectFile> DebugObjOwner = L.getObjectForDebug(Obj);
 104   const ObjectFile &DebugObj = *DebugObjOwner.getBinary();
 105
 106   // Get the address of the object image for use as a unique identifier
 107   const void* ObjData = DebugObj.getData().data();
 108   DIContext* Context = DIContext::getDWARFContext(DebugObj);
 109   MethodAddressVector Functions;
 110
 111   // Use symbol info to iterate functions in the object.
 112   for (symbol_iterator I = DebugObj.symbol_begin(),
 113                        E = DebugObj.symbol_end();
 114                         I != E;
 115                         ++I) {
 116     std::vector<LineNumberInfo> LineInfo;
 117     std::string SourceFileName;
 118
 119     SymbolRef::Type SymType;
 120     if (I->getType(SymType)) continue;
 121     if (SymType == SymbolRef::ST_Function) {
 122       StringRef  Name;
 123       uint64_t   Addr;
 124       uint64_t   Size;
 125       if (I->getName(Name)) continue;
 126       if (I->getAddress(Addr)) continue;
 127       if (I->getSize(Size)) continue;
 128
 129       // Record this address in a local vector
 130       Functions.push_back((void*)Addr);
 131
 132       // Build the function loaded notification message
 133       iJIT_Method_Load FunctionMessage = FunctionDescToIntelJITFormat(*Wrapper,
 134                                            Name.data(),
 135                                            Addr,
 136                                            Size);
 137       if (Context) {
 138         DILineInfoTable  Lines = Context->getLineInfoForAddressRange(Addr, Size);
 139         DILineInfoTable::iterator  Begin = Lines.begin();
 140         DILineInfoTable::iterator  End = Lines.end();
 141         for (DILineInfoTable::iterator It = Begin; It != End; ++It) {
 142           LineInfo.push_back(DILineInfoToIntelJITFormat((uintptr_t)Addr,
 143                                                         It->first,
 144                                                         It->second));
 145         }
 146         if (LineInfo.size() == 0) {
 147           FunctionMessage.source_file_name = 0;
 148           FunctionMessage.line_number_size = 0;
 149           FunctionMessage.line_number_table = 0;
 150         } else {
 151           // Source line information for the address range is provided as
 152           // a code offset for the start of the corresponding sub-range and
 153           // a source line. JIT API treats offsets in LineNumberInfo structures
 154           // as the end of the corresponding code region. The start of the code
 155           // is taken from the previous element. Need to shift the elements.
 156
 157           LineNumberInfo last = LineInfo.back();
 158           last.Offset = FunctionMessage.method_size;
 159           LineInfo.push_back(last);
 160           for (size_t i = LineInfo.size() - 2; i > 0; --i)
 161             LineInfo[i].LineNumber = LineInfo[i - 1].LineNumber;
 162
 163           SourceFileName = Lines.front().second.FileName;
 164           FunctionMessage.source_file_name = const_cast<char *>(SourceFileName.c_str());
 165           FunctionMessage.line_number_size = LineInfo.size();
 166           FunctionMessage.line_number_table = &*LineInfo.begin();
 167         }
 168       } else {
 169         FunctionMessage.source_file_name = 0;
 170         FunctionMessage.line_number_size = 0;
 171         FunctionMessage.line_number_table = 0;
 172       }
 173
 174       Wrapper->iJIT_NotifyEvent(iJVM_EVENT_TYPE_METHOD_LOAD_FINISHED,
 175                                 &FunctionMessage);
 176       MethodIDs[(void*)Addr] = FunctionMessage.method_id;
 177     }
 178   }
 179
 180   // To support object unload notification, we need to keep a list of
 181   // registered function addresses for each loaded object.  We will
 182   // use the MethodIDs map to get the registered ID for each function.
 183   LoadedObjectMap[ObjData] = Functions;
 184   DebugObjects[Obj.getData().data()] = std::move(DebugObjOwner);
 185 }
 186
 187 void IntelJITEventListener::NotifyFreeingObject(const ObjectFile &Obj) {
 188   // This object may not have been registered with the listener. If it wasn't,
 189   // bail out.
 190   if (DebugObjects.find(Obj.getData().data()) == DebugObjects.end())
 191     return;
 192
 193   // Get the address of the object image for use as a unique identifier
 194   const ObjectFile &DebugObj = *DebugObjects[Obj.getData().data()].getBinary();
 195   const void* ObjData = DebugObj.getData().data();
 196
 197   // Get the object's function list from LoadedObjectMap
 198   ObjectMap::iterator OI = LoadedObjectMap.find(ObjData);
 199   if (OI == LoadedObjectMap.end())
 200     return;
 201   MethodAddressVector& Functions = OI->second;
 202
 203   // Walk the function list, unregistering each function
 204   for (MethodAddressVector::iterator FI = Functions.begin(),
 205                                      FE = Functions.end();
 206        FI != FE;
 207        ++FI) {
 208     void* FnStart = const_cast<void*>(*FI);
 209     MethodIDMap::iterator MI = MethodIDs.find(FnStart);
 210     if (MI != MethodIDs.end()) {
 211       Wrapper->iJIT_NotifyEvent(iJVM_EVENT_TYPE_METHOD_UNLOAD_START,
 212                                 &MI->second);
 213       MethodIDs.erase(MI);
 214     }
 215   }
 216
 217   // Erase the object from LoadedObjectMap
 218   LoadedObjectMap.erase(OI);
 219   DebugObjects.erase(Obj.getData().data());
 220 }
 221
 222 }  // anonymous namespace.
 223
 224 namespace llvm {
 225 JITEventListener *JITEventListener::createIntelJITEventListener() {
 226   return new IntelJITEventListener(new IntelJITEventsWrapper);
 227 }
 228
 229 // for testing
 230 JITEventListener *JITEventListener::createIntelJITEventListener(
 231                                       IntelJITEventsWrapper* TestImpl) {
 232   return new IntelJITEventListener(TestImpl);
 233 }
 234
 235 } // namespace llvm
 236