Re: gcc exception handle

[王 刚伟 <gwwang10 at hotmail dot com>]

Hi, 

   extern "C" 
{ 

class A 
{ 
public: 
private: 
   char string[SIZE]; 
}; 

void test1(void) 
{ 
  A obj; 
  try    { 
throw obj; 
         } 
 catch (A &e) 
 { 
printf(" exception ! \n "); 
  } 
} 

}//extern "C" 

when I define "obj" as a global variable ,static variable or dynamic 
variable(allocate space with "malloc") ,there is no error occured;but when 
I define "obj" as a local variable in stack area,program will crash.

Is the reason that the size of variable "obj" is bigger than the stack 
size?
Does the setjmp/longjmp exception handling mechanism have bugs ?

My gcc version is gcc4.1.1 and my compiler is a cross compiler with 
TARGET=sh-elf,HOST=i686-pc-cygwin,BUILD=i686-pc-cygwin.

expecting your answer.

--David

> From: Andrew Haley <aph@redhat.com>
> To: 王 刚伟 <gwwang10@hotmail.com>
> CC: gcc-help@gcc.gnu.org
> Subject: Re: gcc exception handle
> Date: Mon, 29 Jan 2007 11:11:36 +0000
>
> ?瞻 writes:
>  > Hi,
>  >
>  > Here is My test function :
>  >
>  > class A
>  > {
>  > public:
>  > private:
>  >  char string[SIZE];
>  > };
>  >
>  > void test1(void)
>  > {
>  >     A obj;
>  >
>  >     try
>  >     {
>  >        throw obj;
>  >     }
>  >     catch (A &e)
>  >     {
>  >        printf("exception ! \n");
>  >     }
>  > }
>  >
>  > when SIZE <= 68,"__cxa_allocate_exception" allocates space for the
>  > exception successfully,after "__cxa_throw" is 
called,"__cxa_begin_catch" is
>  > called,and the statement "printf..." in the catch block can be 
executed.
>  > when SIZE > 68, ,"__cxa_allocate_exception" also allocates space for 
the
>  > exception successfully,but after "__cxz_throw" is 
called,"__cxa_end_catch"
>  > is called,and the program crashed.
>
> Works for me.  What arch, what compiler version, etc.
>
> Andrew.

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