/* Exception (throw catch) mechanism, for GDB, the GNU debugger.
- Copyright (C) 1986-2014 Free Software Foundation, Inc.
+ Copyright (C) 1986-2015 Free Software Foundation, Inc.
This file is part of GDB.
/* Requested feature, method, mechanism, etc. is not supported. */
NOT_SUPPORTED_ERROR,
+ /* The number of candidates generated during line completion has
+ reached the user's specified limit. This isn't an error, this exception
+ is used to halt searching for more completions, but for consistency
+ "_ERROR" is appended to the name. */
+ MAX_COMPLETIONS_REACHED_ERROR,
+
/* Add more errors here. */
NR_ERRORS
};
/* Functions to drive the exceptions state machine. Though declared
here by necessity, these functions should be considered internal to
- the exceptions subsystem and not used other than via the TRY_CATCH
- macro defined below. */
+ the exceptions subsystem and not used other than via the TRY/CATCH
+ macros defined below. */
-extern SIGJMP_BUF *exceptions_state_mc_init (volatile struct
- gdb_exception *exception,
- return_mask mask);
+#ifndef __cplusplus
+extern SIGJMP_BUF *exceptions_state_mc_init (void);
extern int exceptions_state_mc_action_iter (void);
extern int exceptions_state_mc_action_iter_1 (void);
+extern int exceptions_state_mc_catch (struct gdb_exception *, int);
+#else
+extern void *exception_try_scope_entry (void);
+extern void exception_try_scope_exit (void *saved_state);
+extern void exception_rethrow (void);
+#endif
/* Macro to wrap up standard try/catch behavior.
*INDENT-OFF*
- volatile struct gdb_exception e;
- TRY_CATCH (e, RETURN_MASK_ERROR)
+ TRY
{
}
- switch (e.reason)
+ CATCH (e, RETURN_MASK_ERROR)
{
- case RETURN_ERROR: ...
+ switch (e.reason)
+ {
+ case RETURN_ERROR: ...
+ }
}
+ END_CATCH
*/
-#define TRY_CATCH(EXCEPTION,MASK) \
+#ifndef __cplusplus
+
+#define TRY \
{ \
SIGJMP_BUF *buf = \
- exceptions_state_mc_init (&(EXCEPTION), (MASK)); \
+ exceptions_state_mc_init (); \
SIGSETJMP (*buf); \
} \
while (exceptions_state_mc_action_iter ()) \
while (exceptions_state_mc_action_iter_1 ())
+#define CATCH(EXCEPTION, MASK) \
+ { \
+ struct gdb_exception EXCEPTION; \
+ if (exceptions_state_mc_catch (&(EXCEPTION), MASK))
+
+#define END_CATCH \
+ }
+
+#else
+
+/* Prevent error/quit during TRY from calling cleanups established
+ prior to here. This pops out the scope in either case of normal
+ exit or exception exit. */
+struct exception_try_scope
+{
+ exception_try_scope ()
+ {
+ saved_state = exception_try_scope_entry ();
+ }
+ ~exception_try_scope ()
+ {
+ exception_try_scope_exit (saved_state);
+ }
+
+ void *saved_state;
+};
+
+/* We still need to wrap TRY/CATCH in C++ so that cleanups and C++
+ exceptions can coexist. The TRY blocked is wrapped in a
+ do/while(0) so that break/continue within the block works the same
+ as in C. */
+#define TRY \
+ try \
+ { \
+ exception_try_scope exception_try_scope_instance; \
+ do \
+ {
+
+#define CATCH(EXCEPTION, MASK) \
+ } while (0); \
+ } \
+ catch (struct gdb_exception ## _ ## MASK &EXCEPTION)
+
+#define END_CATCH \
+ catch (...) \
+ { \
+ exception_rethrow (); \
+ }
+
+/* The exception types client code may catch. They're just shims
+ around gdb_exception that add nothing but type info. Which is used
+ is selected depending on the MASK argument passed to CATCH. */
+
+struct gdb_exception_RETURN_MASK_ALL : public gdb_exception
+{
+};
+
+struct gdb_exception_RETURN_MASK_ERROR : public gdb_exception_RETURN_MASK_ALL
+{
+};
+
+struct gdb_exception_RETURN_MASK_QUIT : public gdb_exception_RETURN_MASK_ALL
+{
+};
+
+#endif
+
/* *INDENT-ON* */
/* Hook to allow client-specific actions to be performed prior to
extern void throw_quit (const char *fmt, ...)
ATTRIBUTE_NORETURN ATTRIBUTE_PRINTF (1, 2);
+/* A pre-defined non-exception. */
+extern const struct gdb_exception exception_none;
+
#endif /* COMMON_EXCEPTIONS_H */