| //===-- OProfileJITEventListener.cpp - Tell OProfile about JITted 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 that calls into OProfile to tell |
| // it about JITted functions. For now, we only record function names and sizes, |
| // but eventually we'll also record line number information. |
| // |
| // See http://oprofile.sourceforge.net/doc/devel/jit-interface.html for the |
| // definition of the interface we're using. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #define DEBUG_TYPE "oprofile-jit-event-listener" |
| #include "llvm/Function.h" |
| #include "llvm/ExecutionEngine/JITEventListener.h" |
| #include "llvm/Support/Debug.h" |
| #include "llvm/System/Errno.h" |
| #include "llvm/Config/config.h" |
| #include <stddef.h> |
| using namespace llvm; |
| |
| #if defined(USE_OPROFILE) |
| |
| #include <opagent.h> |
| |
| namespace { |
| |
| class OProfileJITEventListener : public JITEventListener { |
| op_agent_t Agent; |
| public: |
| OProfileJITEventListener(); |
| ~OProfileJITEventListener(); |
| |
| virtual void NotifyFunctionEmitted(const Function &F, |
| void *FnStart, size_t FnSize, |
| const EmittedFunctionDetails &Details); |
| virtual void NotifyFreeingMachineCode(const Function &F, void *OldPtr); |
| }; |
| |
| OProfileJITEventListener::OProfileJITEventListener() |
| : Agent(op_open_agent()) { |
| if (Agent == NULL) { |
| const std::string err_str = sys::StrError(); |
| DOUT << "Failed to connect to OProfile agent: " << err_str << "\n"; |
| } else { |
| DOUT << "Connected to OProfile agent.\n"; |
| } |
| } |
| |
| OProfileJITEventListener::~OProfileJITEventListener() { |
| if (Agent != NULL) { |
| if (op_close_agent(Agent) == -1) { |
| const std::string err_str = sys::StrError(); |
| DOUT << "Failed to disconnect from OProfile agent: " << err_str << "\n"; |
| } else { |
| DOUT << "Disconnected from OProfile agent.\n"; |
| } |
| } |
| } |
| |
| // Adds the just-emitted function to the symbol table. |
| void OProfileJITEventListener::NotifyFunctionEmitted( |
| const Function &F, void *FnStart, size_t FnSize, |
| const EmittedFunctionDetails &) { |
| const char *const FnName = F.getNameStart(); |
| assert(FnName != 0 && FnStart != 0 && "Bad symbol to add"); |
| if (op_write_native_code(Agent, FnName, |
| reinterpret_cast<uint64_t>(FnStart), |
| FnStart, FnSize) == -1) { |
| DOUT << "Failed to tell OProfile about native function " << FnName |
| << " at [" << FnStart << "-" << ((char*)FnStart + FnSize) << "]\n"; |
| } |
| } |
| |
| // Removes the to-be-deleted function from the symbol table. |
| void OProfileJITEventListener::NotifyFreeingMachineCode( |
| const Function &F, void *FnStart) { |
| assert(FnStart && "Invalid function pointer"); |
| if (op_unload_native_code(Agent, reinterpret_cast<uint64_t>(FnStart)) == -1) { |
| DOUT << "Failed to tell OProfile about unload of native function " |
| << F.getName() << " at " << FnStart << "\n"; |
| } |
| } |
| |
| } // anonymous namespace. |
| |
| namespace llvm { |
| JITEventListener *createOProfileJITEventListener() { |
| return new OProfileJITEventListener; |
| } |
| } |
| |
| #else // !defined(USE_OPROFILE) |
| |
| namespace llvm { |
| // By defining this to return NULL, we can let clients call it unconditionally, |
| // even if they haven't configured with the OProfile libraries. |
| JITEventListener *createOProfileJITEventListener() { |
| return NULL; |
| } |
| } // namespace llvm |
| |
| #endif // defined(USE_OPROFILE) |