src/llvm/lib/ExecutionEngine/OProfileJIT/OProfileJITEventListener.cpp

   1 //===-- OProfileJITEventListener.cpp - Tell OProfile about JITted 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 that uses OProfileWrapper to tell
  11 // oprofile about JITted functions, including source line information.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "llvm/Config/config.h"
  16 #include "EventListenerCommon.h"
  17 #include "llvm/CodeGen/MachineFunction.h"
  18 #include "llvm/ExecutionEngine/JITEventListener.h"
  19 #include "llvm/ExecutionEngine/OProfileWrapper.h"
  20 #include "llvm/ExecutionEngine/RuntimeDyld.h"
  21 #include "llvm/IR/DebugInfo.h"
  22 #include "llvm/IR/Function.h"
  23 #include "llvm/Object/ObjectFile.h"
  24 #include "llvm/Support/Debug.h"
  25 #include "llvm/Support/Errno.h"
  26 #include "llvm/Support/raw_ostream.h"
  27 #include <dirent.h>
  28 #include <fcntl.h>
  29
  30 using namespace llvm;
  31 using namespace llvm::jitprofiling;
  32 using namespace llvm::object;
  33
  34 #define DEBUG_TYPE "oprofile-jit-event-listener"
  35
  36 namespace {
  37
  38 class OProfileJITEventListener : public JITEventListener {
  39   std::unique_ptr<OProfileWrapper> Wrapper;
  40
  41   void initialize();
  42   std::map<const char*, OwningBinary<ObjectFile>> DebugObjects;
  43
  44 public:
  45   OProfileJITEventListener(std::unique_ptr<OProfileWrapper> LibraryWrapper)
  46     : Wrapper(std::move(LibraryWrapper)) {
  47     initialize();
  48   }
  49
  50   ~OProfileJITEventListener();
  51
  52   void NotifyObjectEmitted(const ObjectFile &Obj,
  53                            const RuntimeDyld::LoadedObjectInfo &L) override;
  54
  55   void NotifyFreeingObject(const ObjectFile &Obj) override;
  56 };
  57
  58 void OProfileJITEventListener::initialize() {
  59   if (!Wrapper->op_open_agent()) {
  60     const std::string err_str = sys::StrError();
  61     DEBUG(dbgs() << "Failed to connect to OProfile agent: " << err_str << "\n");
  62   } else {
  63     DEBUG(dbgs() << "Connected to OProfile agent.\n");
  64   }
  65 }
  66
  67 OProfileJITEventListener::~OProfileJITEventListener() {
  68   if (Wrapper->isAgentAvailable()) {
  69     if (Wrapper->op_close_agent() == -1) {
  70       const std::string err_str = sys::StrError();
  71       DEBUG(dbgs() << "Failed to disconnect from OProfile agent: "
  72                    << err_str << "\n");
  73     } else {
  74       DEBUG(dbgs() << "Disconnected from OProfile agent.\n");
  75     }
  76   }
  77 }
  78
  79 void OProfileJITEventListener::NotifyObjectEmitted(
  80                                        const ObjectFile &Obj,
  81                                        const RuntimeDyld::LoadedObjectInfo &L) {
  82   if (!Wrapper->isAgentAvailable()) {
  83     return;
  84   }
  85
  86   OwningBinary<ObjectFile> DebugObjOwner = L.getObjectForDebug(Obj);
  87   const ObjectFile &DebugObj = *DebugObjOwner.getBinary();
  88
  89   // Use symbol info to iterate functions in the object.
  90   for (symbol_iterator I = DebugObj.symbol_begin(), E = DebugObj.symbol_end();
  91        I != E; ++I) {
  92     SymbolRef::Type SymType;
  93     if (I->getType(SymType)) continue;
  94     if (SymType == SymbolRef::ST_Function) {
  95       StringRef  Name;
  96       uint64_t   Addr;
  97       uint64_t   Size;
  98       if (I->getName(Name)) continue;
  99       if (I->getAddress(Addr)) continue;
 100       if (I->getSize(Size)) continue;
 101
 102       if (Wrapper->op_write_native_code(Name.data(), Addr, (void*)Addr, Size)
 103                         == -1) {
 104         DEBUG(dbgs() << "Failed to tell OProfile about native function "
 105           << Name << " at ["
 106           << (void*)Addr << "-" << ((char*)Addr + Size) << "]\n");
 107         continue;
 108       }
 109       // TODO: support line number info (similar to IntelJITEventListener.cpp)
 110     }
 111   }
 112
 113   DebugObjects[Obj.getData().data()] = std::move(DebugObjOwner);
 114 }
 115
 116 void OProfileJITEventListener::NotifyFreeingObject(const ObjectFile &Obj) {
 117   if (Wrapper->isAgentAvailable()) {
 118
 119     // If there was no agent registered when the original object was loaded then
 120     // we won't have created a debug object for it, so bail out.
 121     if (DebugObjects.find(Obj.getData().data()) == DebugObjects.end())
 122       return;
 123
 124     const ObjectFile &DebugObj = *DebugObjects[Obj.getData().data()].getBinary();
 125
 126     // Use symbol info to iterate functions in the object.
 127     for (symbol_iterator I = DebugObj.symbol_begin(),
 128                          E = DebugObj.symbol_end();
 129          I != E; ++I) {
 130       SymbolRef::Type SymType;
 131       if (I->getType(SymType)) continue;
 132       if (SymType == SymbolRef::ST_Function) {
 133         uint64_t   Addr;
 134         if (I->getAddress(Addr)) continue;
 135
 136         if (Wrapper->op_unload_native_code(Addr) == -1) {
 137           DEBUG(dbgs()
 138                 << "Failed to tell OProfile about unload of native function at "
 139                 << (void*)Addr << "\n");
 140           continue;
 141         }
 142       }
 143     }
 144   }
 145
 146   DebugObjects.erase(Obj.getData().data());
 147 }
 148
 149 }  // anonymous namespace.
 150
 151 namespace llvm {
 152 JITEventListener *JITEventListener::createOProfileJITEventListener() {
 153   return new OProfileJITEventListener(llvm::make_unique<OProfileWrapper>());
 154 }
 155
 156 } // namespace llvm
 157