C++异常捕获

C++异常捕获

windows下使用_set_se_translator，linux下使用sjlj

• main.cpp

#include <stdio.h>   // printf
#include "myException.h"

int main()
{
    try
    {
        MY_EXCEPTION_CHECK

        // 0xc0000005
        int *p = 0;
        *p = 1;

        // 0xc0000094
        // int x=0;
        // int y=0;
        // volatile int z=x/y;
    }
    catch (const MyException &e)
    {
        printf("myException %s\n", e.what());
    }
    catch (...)
    {
        printf("exception...\n");
    }
}

• myException.h

#ifndef _MY_EXCEPTION_H
#define _MY_EXCEPTION_H

#ifdef _WIN32
#include <windows.h> // EXCEPTION_POINTERS
#include <eh.h>      // _set_se_translator
#else
#include <setjmp.h> // jmp_buf sigsetjmp
#endif

#include <exception> // std::exception
#include <stdio.h>   // sprintf

#if _WIN32
class MyException : public std::exception
{
public:
    MyException(int code) noexcept;

    const char *what() const throw();

private:
    static void handler(unsigned int u, EXCEPTION_POINTERS *e);

private:
    int m_code;
};
#else
class MyException : public std::exception
{
public:
    MyException(int code) noexcept;

    const char *what() const throw();

private:
    static void handler(int code);

private:
    int m_code;
};
#endif

#if _WIN32
#define MY_EXCEPTION_CHECK
#else
extern jmp_buf env;

#define MY_EXCEPTION_CHECK           \
    {                                \
        int ret = sigsetjmp(env, 1); \
        if (0 != ret)                \
        {                            \
            throw MyException(ret);  \
        }                            \
    }
#endif

#endif // _MY_EXCEPTION_H

• myException.cpp

#include "myException.h"

#if _WIN32
#else
#include <signal.h> // signal
#endif

#if _WIN32
MyException::MyException(int code) noexcept
	: m_code(code)
{
	_set_se_translator(MyException::handler); // need /EHa
}

const char *MyException::what() const throw()
{
	static char str[50];
	sprintf(str, "C++ Exception. code: %x", m_code);
	return str;
}

void MyException::handler(unsigned int u, EXCEPTION_POINTERS *e)
{
	throw MyException(u);
}
#else
jmp_buf env;
MyException::MyException(int code) noexcept
	: m_code(code)
{
	signal(SIGSEGV, MyException::handler); // segmentation fault
	signal(SIGFPE, MyException::handler);  // divide by zero
}

const char *MyException::what() const throw()
{
	static char str[50];
	sprintf(str, "C++ Exception. code: %d", m_code);
	return str;
}

void MyException::handler(int code)
{
	siglongjmp(env, code);
}
#endif

MyException myException(0);

• CMakeLists.txt

cmake_minimum_required (VERSION 2.8.12)

project (main)

if(WIN32)
    # windows _set_se_translator need /EHa
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /GS /EHa")
endif()

include_directories(.)

add_executable(${PROJECT_NAME} main.cpp myException.cpp)