1 //===- JITEventListener.h - Exposes events from JIT compilation -*- C++ -*-===// 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 the JITEventListener interface, which lets users get 11 // callbacks when significant events happen during the JIT compilation process. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_EXECUTION_ENGINE_JIT_EVENTLISTENER_H 16 #define LLVM_EXECUTION_ENGINE_JIT_EVENTLISTENER_H 17 18 #include "llvm/Support/DataTypes.h" 19 #include "llvm/Support/DebugLoc.h" 20 21 #include <vector> 22 23 namespace llvm { 24 class Function; 25 class MachineFunction; 26 27 /// JITEvent_EmittedFunctionDetails - Helper struct for containing information 28 /// about a generated machine code function. 29 struct JITEvent_EmittedFunctionDetails { 30 struct LineStart { 31 /// The address at which the current line changes. 32 uintptr_t Address; 33 34 /// The new location information. These can be translated to DebugLocTuples 35 /// using MF->getDebugLocTuple(). 36 DebugLoc Loc; 37 }; 38 39 /// The machine function the struct contains information for. 40 const MachineFunction *MF; 41 42 /// The list of line boundary information, sorted by address. 43 std::vector<LineStart> LineStarts; 44 }; 45 46 /// JITEventListener - Abstract interface for use by the JIT to notify clients 47 /// about significant events during compilation. For example, to notify 48 /// profilers and debuggers that need to know where functions have been emitted. 49 /// 50 /// The default implementation of each method does nothing. 51 class JITEventListener { 52 public: 53 typedef JITEvent_EmittedFunctionDetails EmittedFunctionDetails; 54 55 public: 56 JITEventListener() {} 57 virtual ~JITEventListener(); 58 59 /// NotifyFunctionEmitted - Called after a function has been successfully 60 /// emitted to memory. The function still has its MachineFunction attached, 61 /// if you should happen to need that. 62 virtual void NotifyFunctionEmitted(const Function &F, 63 void *Code, size_t Size, 64 const EmittedFunctionDetails &Details) {} 65 66 /// NotifyFreeingMachineCode - Called from freeMachineCodeForFunction(), after 67 /// the global mapping is removed, but before the machine code is returned to 68 /// the allocator. 69 /// 70 /// OldPtr is the address of the machine code and will be the same as the Code 71 /// parameter to a previous NotifyFunctionEmitted call. The Function passed 72 /// to NotifyFunctionEmitted may have been destroyed by the time of the 73 /// matching NotifyFreeingMachineCode call. 74 virtual void NotifyFreeingMachineCode(void *OldPtr) {} 75 }; 76 77 // This returns NULL if support isn't available. 78 JITEventListener *createOProfileJITEventListener(); 79 80 } // end namespace llvm. 81 82 #endif 83
