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| //===-- OProfileWrapper.h - OProfile JIT API Wrapper ------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// This file defines a OProfileWrapper object that detects if the oprofile
// daemon is running, and provides wrappers for opagent functions used to
// communicate with the oprofile JIT interface. The dynamic library libopagent
// does not need to be linked directly as this object lazily loads the library
// when the first op_ function is called.
//
// See http://oprofile.sourceforge.net/doc/devel/jit-interface.html for the
// definition of the interface.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_EXECUTIONENGINE_OPROFILEWRAPPER_H
#define LLVM_EXECUTIONENGINE_OPROFILEWRAPPER_H
#include "llvm/Support/DataTypes.h"
#include <opagent.h>
namespace llvm {
class OProfileWrapper {
typedef op_agent_t (*op_open_agent_ptr_t)();
typedef int (*op_close_agent_ptr_t)(op_agent_t);
typedef int (*op_write_native_code_ptr_t)(op_agent_t,
const char*,
uint64_t,
void const*,
const unsigned int);
typedef int (*op_write_debug_line_info_ptr_t)(op_agent_t,
void const*,
size_t,
struct debug_line_info const*);
typedef int (*op_unload_native_code_ptr_t)(op_agent_t, uint64_t);
// Also used for op_minor_version function which has the same signature
typedef int (*op_major_version_ptr_t)();
// This is not a part of the opagent API, but is useful nonetheless
typedef bool (*IsOProfileRunningPtrT)();
op_agent_t Agent;
op_open_agent_ptr_t OpenAgentFunc;
op_close_agent_ptr_t CloseAgentFunc;
op_write_native_code_ptr_t WriteNativeCodeFunc;
op_write_debug_line_info_ptr_t WriteDebugLineInfoFunc;
op_unload_native_code_ptr_t UnloadNativeCodeFunc;
op_major_version_ptr_t MajorVersionFunc;
op_major_version_ptr_t MinorVersionFunc;
IsOProfileRunningPtrT IsOProfileRunningFunc;
bool Initialized;
public:
OProfileWrapper();
// For testing with a mock opagent implementation, skips the dynamic load and
// the function resolution.
OProfileWrapper(op_open_agent_ptr_t OpenAgentImpl,
op_close_agent_ptr_t CloseAgentImpl,
op_write_native_code_ptr_t WriteNativeCodeImpl,
op_write_debug_line_info_ptr_t WriteDebugLineInfoImpl,
op_unload_native_code_ptr_t UnloadNativeCodeImpl,
op_major_version_ptr_t MajorVersionImpl,
op_major_version_ptr_t MinorVersionImpl,
IsOProfileRunningPtrT MockIsOProfileRunningImpl = 0)
: OpenAgentFunc(OpenAgentImpl),
CloseAgentFunc(CloseAgentImpl),
WriteNativeCodeFunc(WriteNativeCodeImpl),
WriteDebugLineInfoFunc(WriteDebugLineInfoImpl),
UnloadNativeCodeFunc(UnloadNativeCodeImpl),
MajorVersionFunc(MajorVersionImpl),
MinorVersionFunc(MinorVersionImpl),
IsOProfileRunningFunc(MockIsOProfileRunningImpl),
Initialized(true)
{
}
// Calls op_open_agent in the oprofile JIT library and saves the returned
// op_agent_t handle internally so it can be used when calling all the other
// op_* functions. Callers of this class do not need to keep track of
// op_agent_t objects.
bool op_open_agent();
int op_close_agent();
int op_write_native_code(const char* name,
uint64_t addr,
void const* code,
const unsigned int size);
int op_write_debug_line_info(void const* code,
size_t num_entries,
struct debug_line_info const* info);
int op_unload_native_code(uint64_t addr);
int op_major_version();
int op_minor_version();
// Returns true if the oprofiled process is running, the opagent library is
// loaded and a connection to the agent has been established, and false
// otherwise.
bool isAgentAvailable();
private:
// Loads the libopagent library and initializes this wrapper if the oprofile
// daemon is running
bool initialize();
// Searches /proc for the oprofile daemon and returns true if the process if
// found, or false otherwise.
bool checkForOProfileProcEntry();
bool isOProfileRunning();
};
} // namespace llvm
#endif // LLVM_EXECUTIONENGINE_OPROFILEWRAPPER_H
|