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2005-02-08 Andrew Cagney <cagney@gnu.org>

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* exceptions.c: Do not include <setjmp.h>.
	(SIGJMP_BUF, SIGSETJMP, SIGLONGJMP): Delete macros.
	(catch_exception, catch_exceptions_with_msg, catch_errors)
	(catch_command_errors): Use TRY_CATCH.
	(struct catcher): Use EXCEPTIONS_SIGJMP_BUF.
	(exceptions_state_mc_init): Rename catcher_init.
	(exceptions_state_mc): Rename catcher_state_machine.
	(exceptions_state_mc_action_iter)
	(exceptions_state_mc_action_iter_1): New functions.
	* exceptions.h: Include <setjmp.h>.
	(EXCEPTIONS_SIGJMP_BUF, EXCEPTIONS_SIGSETJMP)
	(EXCEPTIONS_SIGLONGJMP): Define.
	(exceptions_state_mc_init, exceptions_state_mc_action_iter)
	(exceptions_state_mc_action_iter_1): Declare.
	(TRY_CATCH): Define.
This commit is contained in:
Andrew Cagney 2005-02-08 23:44:06 +00:00
parent c36e61546a
commit 6941d02a18
3 changed files with 110 additions and 39 deletions
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57
gdb/exceptions.h
View file

@ -24,6 +24,10 @@
#ifndef EXCEPTIONS_H
#define EXCEPTIONS_H
struct ui_out;
#include <setjmp.h>
/* Reasons for calling throw_exceptions(). NOTE: all reason values
must be less than zero. enum value 0 is reserved for internal use
as the return value from an initial setjmp(). The function
@ -66,6 +70,59 @@ struct exception
/* A pre-defined non-exception. */
extern const struct exception exception_none;
/* Wrap set/long jmp so that it's more portable (internal to
exceptions). */
#if defined(HAVE_SIGSETJMP)
#define EXCEPTIONS_SIGJMP_BUF sigjmp_buf
#define EXCEPTIONS_SIGSETJMP(buf) sigsetjmp((buf), 1)
#define EXCEPTIONS_SIGLONGJMP(buf,val) siglongjmp((buf), (val))
#else
#define EXCEPTIONS_SIGJMP_BUF jmp_buf
#define EXCEPTIONS_SIGSETJMP(buf) setjmp(buf)
#define EXCEPTIONS_SIGLONGJMP(buf,val) longjmp((buf), (val))
#endif
/* Functions to drive the exceptions state m/c (internal to
exceptions). */
EXCEPTIONS_SIGJMP_BUF *exceptions_state_mc_init (struct ui_out *func_uiout,
volatile struct exception *
exception,
return_mask mask);
int exceptions_state_mc_action_iter (void);
int exceptions_state_mc_action_iter_1 (void);
/* Macro to wrap up standard try/catch behavior.
The double loop lets us correctly handle code "break"ing out of the
try catch block. (It works as the "break" only exits the inner
"while" loop, the outer for loop detects this handling it
correctly.) Of course "return" and "goto" are not so lucky.
For instance:
*INDENT-OFF*
volatile struct exception e;
TRY_CATCH (e, RETURN_MASK_ERROR)
{
}
switch (e.reason)
{
case RETURN_ERROR: ...
}
*/
#define TRY_CATCH(EXCEPTION,MASK) \
for (EXCEPTIONS_SIGSETJMP \
(*exceptions_state_mc_init (uiout, &(EXCEPTION), (MASK))); \
exceptions_state_mc_action_iter (); ) \
while (exceptions_state_mc_action_iter_1 ())
/* *INDENT-ON* */
/* If E is an exception, print it's error message on the specified
stream. for _fprintf, prefix the message with PREFIX... */
extern void exception_print (struct ui_file *file, struct exception e);