异常处理崩溃或退出 [英] Exception handling crashes or exits
问题描述
嗨大家好！
我正在使用gcc 4.2.3和glibc6 2.7。
我正在做一个异常处理实现图书馆。虽然我假设它已经正确完成，但是设置了一个处理程序，它会以随机退出值退出程序
，并且没有设置处理程序，它会崩溃用
SIGSEGV，但正如我在gdb中发现的那样，在同一行代码中：
__libc_siglongjmp（env = 0xbfb935f0，val = 1） at longjmp.c：29
29 {
31 _longjmp_unwind（env，val）;
_longjmp_unwind（env = 0xbfb935f0，val = 1）在
../nptl/sysdeps/unix/sysv/linux/jmp-unwind.c:32
32 if（__libc_pthread_functions_init）
39}
__libc_siglongjmp（env = 0xbfb935f0，val = 1）at longjmp.c：33
33 if（env [0] .__ mask_was_saved）
39 __longjmp（env [0] .__ jmpbuf，val？：1）;
我使用的类型是：
typedef struct ExcType ExcType;
typedef struct ExcVal ExcVal;
typedef struct Exception Exception;
struct ExcType {
const char * name; < br $> b $ b};
union ExcVal {
void * None;
int Int;
char * Char;
};
typedef enum {
NoneType，
IntType，
CharType
}数据类型; < br $>
struct Exception {
ExcType * tp;
ExcVal * val;
数据类型dt;
};
struct ExcEntry {
ExcEntry * prev，* next;
jmp_buf buf;
例外* exc;
};
extern ExcEntry * currexc;
我做异常处理的宏如下：
#define试试\
{\
Exception exc; \
ExcEntry excn; \
excn.exc =& exc; excn.prev = currexc; \
currexc = excn.prev-> next =& excn; \
if（setjmp（excn.buf）== 0）
#define catch（e）\
Exception * e =& exc; \
for（; 0; currexc = currexc-> prev）
#define exctype（et，action）\
if（e-> tp ==& et）{action; }
#define endtry}
#define throw（t，vl）\
{currexc-> exc-> tp = NULL; \
currexc-> exc-> tp =& t; \
currexc-> exc-> val-> Char = （char *）vl; \
currexc-> exc-> dt = CharType; \
jmp_buf buf; \
memcpy（（void *）& buf，（void *）currexc-> buf，sizeof（jmp_buf））; \
longjmp（buf，1）;}
示例程序可以是：
#include< stdio.h>
ExcType RuntimeError;
int main （int argc，char ** argv）
{
try {
throw（RuntimeError，" test error"）;
} catch（e）{
fprintf（stderr，foobar！\ n）;
退出（42）;
} endtry;
}
我不知道问题出在哪里。有谁可以帮助我吗？
问候，
Fabiano
< blockquote> 2008-09-08，Fabiano Sidler< fa *********** @ my-mail.chwrote：
嗨伙伴们！
我正在使用gcc 4.2.3和glibc6 2.7。
我正在为库执行异常处理实现。虽然我假设它已经正确完成，但是设置了一个处理程序，它会以随机退出值退出程序
，并且没有设置处理程序，它会崩溃用
SIGSEGV，但正如我在gdb中发现的那样，在同一行代码中：
__libc_siglongjmp（env = 0xbfb935f0，val = 1） at longjmp.c：29
29 {
31 _longjmp_unwind（env，val）;
_longjmp_unwind（env = 0xbfb935f0，val = 1）在
../nptl/sysdeps/unix/sysv/linux/jmp-unwind.c:32
32 if（__libc_pthread_functions_init）
39}
__libc_siglongjmp（env = 0xbfb935f0，val = 1）at longjmp.c：33
33 if（env [0] .__ mask_was_saved）
39 __longjmp（env [0] .__ jmpbuf，val？：1）;
我使用的类型是：
typedef struct ExcType ExcType;
typedef struct ExcVal ExcVal;
typedef struct Exception Exception;
struct ExcType {
const char *姓名;
};
union ExcVal {
void *无;
int Int;
char * Char;
};
typedef enum {
NoneType，
IntType，
CharType
}数据类型;
struct异常{
ExcType * tp;
ExcVal * val;
数据类型dt ;
};
struct ExcEntry {
ExcEntry * prev，* next;
jmp_buf buf;
异常* exc;
};
extern ExcEntry * currexc;
其中是这个定义的？您似乎在没有定义它的情况下使用它。该程序是否成功链接？
>
我做异常处理的宏如下：
#define尝试\
{\
Exception exc; \
ExcEntry excn; \
excn。 EXC =安培; EXC; excn.prev = currexc; \
currexc = excn.prev-> next =& excn; \
if（setjmp（excn.buf）== 0）
#define catch（e）\
Exception * e =& exc; \
for（; 0; currexc = currexc-> prev）
#define exctype（et，action）\
if（e-> tp ==& et）{action; }
#define endtry}
#define throw（t，vl）\
{currexc-> exc-> tp = NULL; \
currexc-> exc-> tp =& t; \
currexc-> exc-> val-> Char = （char *）vl; \
currexc-> exc-> dt = CharType; \
jmp_buf buf; \
memcpy（（void *）& buf，（void *）currexc-> buf，sizeof（jmp_buf））; \
longjmp（buf，1）;}
示例程序可以是：
#include< stdio.h>
ExcType RuntimeError;
int main（int argc，char ** argv）
{
try {
throw（RuntimeError，" test error"） ;
} catch（e）{
fprintf（stderr，" foobar！\ n"）;
退出（42）;
} endtry;
}
我不知道问题出在哪里。这里有谁可以帮助我？
问候，
Fabiano
-
Andrew Poelstra ap*******@wpsoftware.com
要给我发电子邮件，请使用以上电子邮件地址，.com设置为.net
On 2008-09-08，Andrew Poelstra< ap *** ****@supernova.homewrote：
这个定义在哪里？
jmp_buf在setjmp.h中定义，而setjmp.h又是ANSI C头。
也许我应该写这个.. 。在我的程序中，它包括在内。
此程序是否成功链接？
< setjmp.h必须包括在内，定义（和声明）
必须在main（）之前完成，但之后呢确实如此，否则它不会是SEGSEGV
这里......;）
问候，
法比亚诺
2008-09-08，Fabiano Sidler< fa *********** @ my-mail.chwrote：
2008-09-08，Andrew Poelstra< ap ******* @ supernova.homewrote：
> Where是这个定义的？
jmp_buf在setjmp.h中定义，反过来又是ANSI C头。
也许我应该写这个..在我的程序中，它包括在内。
当然，但是jmp_buf只是currexc对象的一个成员，对于
哪个存储是永远不会分配（因为这个对象不是
定义，据我所知）。
>此程序是否成功链接？
< setjmp.h必须包括在内，定义（和声明）
必须在main（）之前完成，但是它确实如此，否则它这里没有SEGSEGV
...;）
-
Andrew Poelstra ap ******* @ wpsoftware.com
要给我发电子邮件，请使用上面的电子邮件地址.com设置为.net
Hi folks!
I''m using gcc 4.2.3 and glibc6 2.7.
I''m doing an exception handling implementation for a library. Although I
assume to have it done properly, with a handler set up, it exits the program
with a random exit value, and without a handler set up, it crashes with a
SIGSEGV, but as I have found out with gdb, at the same line of code:
__libc_siglongjmp (env=0xbfb935f0, val=1) at longjmp.c:29
29 {
31 _longjmp_unwind (env, val);
_longjmp_unwind (env=0xbfb935f0, val=1) at
../nptl/sysdeps/unix/sysv/linux/jmp-unwind.c:32
32 if (__libc_pthread_functions_init)
39 }
__libc_siglongjmp (env=0xbfb935f0, val=1) at longjmp.c:33
33 if (env[0].__mask_was_saved)
39 __longjmp (env[0].__jmpbuf, val ?: 1);
The types i use are:
typedef struct ExcType ExcType;
typedef struct ExcVal ExcVal;
typedef struct Exception Exception;
struct ExcType {
const char *name;
};
union ExcVal {
void* None;
int Int;
char* Char;
};
typedef enum {
NoneType,
IntType,
CharType
} Datatype;
struct Exception {
ExcType *tp;
ExcVal *val;
Datatype dt;
};
struct ExcEntry {
ExcEntry *prev,*next;
jmp_buf buf;
Exception *exc;
};
extern ExcEntry *currexc;
My macros for doing exception handling are as follows:
#define try \
{\
Exception exc;\
ExcEntry excn;\
excn.exc=&exc; excn.prev=currexc;\
currexc = excn.prev->next = &excn;\
if ( setjmp(excn.buf)==0 )
#define catch(e) \
Exception *e = &exc;\
for (;0;currexc=currexc->prev)
#define exctype(et, action) \
if ( e->tp==&et ) { action; }
#define endtry }
#define throw(t,vl) \
{currexc->exc->tp=NULL;\
currexc->exc->tp=&t;\
currexc->exc->val->Char=(char*)vl;\
currexc->exc->dt=CharType;\
jmp_buf buf;\
memcpy((void*)&buf,(void*)currexc->buf, sizeof(jmp_buf));\
longjmp(buf,1);}
A sample program could be:
#include <stdio.h>
ExcType RuntimeError;
int main(int argc, char **argv)
{
try {
throw(RuntimeError,"test error");
} catch(e) {
fprintf(stderr,"foobar!\n");
exit(42);
} endtry;
}
I don''t see where the problem is. Any professional here who can help me?
Greetings,
Fabiano
On 2008-09-08, Fabiano Sidler <fa***********@my-mail.chwrote:Hi folks!
I''m using gcc 4.2.3 and glibc6 2.7.
I''m doing an exception handling implementation for a library. Although I
assume to have it done properly, with a handler set up, it exits the program
with a random exit value, and without a handler set up, it crashes with a
SIGSEGV, but as I have found out with gdb, at the same line of code:
__libc_siglongjmp (env=0xbfb935f0, val=1) at longjmp.c:29
29 {
31 _longjmp_unwind (env, val);
_longjmp_unwind (env=0xbfb935f0, val=1) at
../nptl/sysdeps/unix/sysv/linux/jmp-unwind.c:32
32 if (__libc_pthread_functions_init)
39 }
__libc_siglongjmp (env=0xbfb935f0, val=1) at longjmp.c:33
33 if (env[0].__mask_was_saved)
39 __longjmp (env[0].__jmpbuf, val ?: 1);
The types i use are:
typedef struct ExcType ExcType;
typedef struct ExcVal ExcVal;
typedef struct Exception Exception;
struct ExcType {
const char *name;
};
union ExcVal {
void* None;
int Int;
char* Char;
};
typedef enum {
NoneType,
IntType,
CharType
} Datatype;
struct Exception {
ExcType *tp;
ExcVal *val;
Datatype dt;
};
struct ExcEntry {
ExcEntry *prev,*next;
jmp_buf buf;
Exception *exc;
};
extern ExcEntry *currexc;
Where is this defined? You appear to use it without ever
defining it. Does this program link successfully?>
My macros for doing exception handling are as follows:
#define try \
{\
Exception exc;\
ExcEntry excn;\
excn.exc=&exc; excn.prev=currexc;\
currexc = excn.prev->next = &excn;\
if ( setjmp(excn.buf)==0 )
#define catch(e) \
Exception *e = &exc;\
for (;0;currexc=currexc->prev)
#define exctype(et, action) \
if ( e->tp==&et ) { action; }
#define endtry }
#define throw(t,vl) \
{currexc->exc->tp=NULL;\
currexc->exc->tp=&t;\
currexc->exc->val->Char=(char*)vl;\
currexc->exc->dt=CharType;\
jmp_buf buf;\
memcpy((void*)&buf,(void*)currexc->buf, sizeof(jmp_buf));\
longjmp(buf,1);}
A sample program could be:
#include <stdio.h>
ExcType RuntimeError;
int main(int argc, char **argv)
{
try {
throw(RuntimeError,"test error");
} catch(e) {
fprintf(stderr,"foobar!\n");
exit(42);
} endtry;
}
I don''t see where the problem is. Any professional here who can help me?
Greetings,
Fabiano
--
Andrew Poelstra ap*******@wpsoftware.com
To email me, use the above email addresss with .com set to .net
On 2008-09-08, Andrew Poelstra <ap*******@supernova.homewrote:Where is this defined?jmp_buf is defined in setjmp.h which is, in turn, an ANSI C header.
Maybe i should have written this...in my program, it is included.
Does this program link successfully?<setjmp.hmust be included and the definitions (and the declaration)
must be done before main(), but then it does, otherwise it couldn''t SEGSEGV
here...;)
Greetings,
Fabiano
On 2008-09-08, Fabiano Sidler <fa***********@my-mail.chwrote:On 2008-09-08, Andrew Poelstra <ap*******@supernova.homewrote:>Where is this defined?
jmp_buf is defined in setjmp.h which is, in turn, an ANSI C header.
Maybe i should have written this...in my program, it is included.
Sure, but jmp_buf is just a member of the currexc object, for
which storage is never allocated (since this object is not
defined, as far as I can tell).
>Does this program link successfully?
<setjmp.hmust be included and the definitions (and the declaration)
must be done before main(), but then it does, otherwise it couldn''t SEGSEGV
here...;)
--
Andrew Poelstra ap*******@wpsoftware.com
To email me, use the above email addresss with .com set to .net
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