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* defs.h (enum return_reason): Renumber so that all values are
negative. (RETURN_MASK): Negate reason. (catch_exception_ftype): Declare. (catch_exceptions): Declare. * top.c (catcher): New function, based on catch_errors. Add in parameter func_uiout and out parameters func_val, func_caught and func_cleanup. Change type of func to catch_exceptions_ftype. Save/restore uiout. (struct catch_errors_args): Define. (do_catch_errors): New function. (catch_errors): Rewrite, use do_catch_errors and catcher. (catch_exceptions): New function, use catcher.
This commit is contained in:
Andrew Cagney
parent
a2e2dd8055
commit
f9c696d277
@ -1,3 +1,19 @@
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2001-09-07 Andrew Cagney <ac131313@redhat.com>
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* defs.h (enum return_reason): Renumber so that all values are
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negative.
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(RETURN_MASK): Negate reason.
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(catch_exception_ftype): Declare.
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(catch_exceptions): Declare.
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* top.c (catcher): New function, based on catch_errors. Add in
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parameter func_uiout and out parameters func_val, func_caught and
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func_cleanup. Change type of func to catch_exceptions_ftype.
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Save/restore uiout.
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(struct catch_errors_args): Define.
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(do_catch_errors): New function.
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(catch_errors): Rewrite, use do_catch_errors and catcher.
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(catch_exceptions): New function, use catcher.
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2001-09-07 Jim Blandy <jimb@redhat.com>
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Correctly parse register values provided by the monitor.
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43
gdb/defs.h
43
gdb/defs.h
@ -1084,21 +1084,23 @@ extern NORETURN void internal_error (const char *file, int line,
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extern NORETURN void nomem (long) ATTR_NORETURN;
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/* Reasons for calling return_to_top_level. Note: enum value 0 is
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reserved for internal use as the return value from an initial
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setjmp(). */
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/* Reasons for calling return_to_top_level. NOTE: all reason values
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must be less than zero. enum value 0 is reserved for internal use
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as the return value from an initial setjmp(). The function
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catch_exceptions() reserves values >= 0 as legal results from its
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wrapped function. */
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enum return_reason
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{
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/* User interrupt. */
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RETURN_QUIT = 1,
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RETURN_QUIT = -2,
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/* Any other error. */
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RETURN_ERROR
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};
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#define ALL_CLEANUPS ((struct cleanup *)0)
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#define RETURN_MASK(reason) (1 << (int)(reason))
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#define RETURN_MASK(reason) (1 << (int)(-reason))
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#define RETURN_MASK_QUIT RETURN_MASK (RETURN_QUIT)
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#define RETURN_MASK_ERROR RETURN_MASK (RETURN_ERROR)
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#define RETURN_MASK_ALL (RETURN_MASK_QUIT | RETURN_MASK_ERROR)
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@ -1106,12 +1108,41 @@ typedef int return_mask;
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extern NORETURN void return_to_top_level (enum return_reason) ATTR_NORETURN;
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/* Call FUNC(UIOUT, FUNC_ARGS) but wrapped within an exception
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handler. If an exception (enum return_reason) is thrown using
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return_to_top_level() than all cleanups installed since
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catch_exceptions() was entered are invoked, the (-ve) exception
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value is then returned by catch_exceptions. If FUNC() returns
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normally (with a postive or zero return value) then that value is
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returned by catch_exceptions(). It is an internal_error() for
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FUNC() to return a negative value.
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For the period of the FUNC() call: UIOUT is installed as the output
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builder; ERRSTRING is installed as the error/quit message; and a
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new cleanup_chain is established. The old values are restored
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before catch_exceptions() returns.
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FIXME; cagney/2001-08-13: The need to override the global UIOUT
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builder variable should just go away.
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This function superseeds catch_errors().
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This function uses SETJMP() and LONGJUMP(). */
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struct ui_out;
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typedef int (catch_exceptions_ftype) (struct ui_out *ui_out, void *args);
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extern int catch_exceptions (struct ui_out *uiout,
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catch_exceptions_ftype *func, void *func_args,
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char *errstring, return_mask mask);
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/* If CATCH_ERRORS_FTYPE throws an error, catch_errors() returns zero
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otherwize the result from CATCH_ERRORS_FTYPE is returned. It is
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probably useful for CATCH_ERRORS_FTYPE to always return a non-zero
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value. It's unfortunate that, catch_errors() does not return an
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indication of the exact exception that it caught - quit_flag might
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help. */
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help.
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This function is superseeded by catch_exceptions(). */
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typedef int (catch_errors_ftype) (PTR);
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extern int catch_errors (catch_errors_ftype *, PTR, char *, return_mask);
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115
gdb/top.c
115
gdb/top.c
@ -41,6 +41,7 @@
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#include "version.h"
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#include "serial.h"
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#include "doublest.h"
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#include "gdb_assert.h"
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/* readline include files */
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#include <readline/readline.h>
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@ -334,10 +335,11 @@ return_to_top_level (enum return_reason reason)
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(NORETURN void) SIGLONGJMP (*catch_return, (int) reason);
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}
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/* Call FUNC with arg ARGS, catching any errors. If there is no
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error, return the value returned by FUNC. If there is an error,
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print ERRSTRING, print the specific error message, then return
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zero.
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/* Call FUNC() with args FUNC_UIOUT and FUNC_ARGS, catching any
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errors. Set FUNC_CAUGHT to an ``enum return_reason'' if the
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function is aborted (using return_to_top_level() or zero if the
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function returns normally. Set FUNC_VAL to the value returned by
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the function or 0 if the function was aborted.
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Must not be called with immediate_quit in effect (bad things might
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happen, say we got a signal in the middle of a memcpy to quit_return).
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@ -365,21 +367,30 @@ return_to_top_level (enum return_reason reason)
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be consolidated into a single file instead of being distributed
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between utils.c and top.c? */
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int
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catch_errors (catch_errors_ftype *func, void * args, char *errstring,
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return_mask mask)
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static void
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catcher (catch_exceptions_ftype *func,
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struct ui_out *func_uiout,
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void *func_args,
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int *func_val,
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enum return_reason *func_caught,
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char *errstring,
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return_mask mask)
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{
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SIGJMP_BUF *saved_catch;
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SIGJMP_BUF catch;
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int val;
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struct cleanup *saved_cleanup_chain;
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char *saved_error_pre_print;
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char *saved_quit_pre_print;
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struct ui_out *saved_uiout;
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/* Return value from SIGSETJMP(): enum return_reason if error or
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quit caught, 0 otherwise. */
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int caught;
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/* Return value from FUNC(): Hopefully non-zero. Explicitly set to
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zero if an error quit was caught. */
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int val;
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/* Override error/quit messages during FUNC. */
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saved_error_pre_print = error_pre_print;
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@ -390,6 +401,11 @@ catch_errors (catch_errors_ftype *func, void * args, char *errstring,
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if (mask & RETURN_MASK_QUIT)
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quit_pre_print = errstring;
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/* Override the global ``struct ui_out'' builder. */
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saved_uiout = uiout;
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uiout = func_uiout;
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/* Prevent error/quit during FUNC from calling cleanups established
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prior to here. */
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@ -401,7 +417,7 @@ catch_errors (catch_errors_ftype *func, void * args, char *errstring,
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catch_return = &catch;
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caught = SIGSETJMP (catch);
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if (!caught)
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val = (*func) (args);
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val = (*func) (func_uiout, func_args);
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else
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val = 0;
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catch_return = saved_catch;
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@ -413,47 +429,78 @@ catch_errors (catch_errors_ftype *func, void * args, char *errstring,
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do_cleanups call (to cover the problem) or an assertion check to
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detect bad FUNCs code. */
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/* Restore the cleanup chain and error/quit messages to their
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original states. */
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/* Restore the cleanup chain, the error/quit messages, and the uiout
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builder, to their original states. */
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restore_cleanups (saved_cleanup_chain);
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uiout = saved_uiout;
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if (mask & RETURN_MASK_QUIT)
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quit_pre_print = saved_quit_pre_print;
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if (mask & RETURN_MASK_ERROR)
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error_pre_print = saved_error_pre_print;
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/* Return normally if no error/quit event occurred. */
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/* Return normally if no error/quit event occurred or this catcher
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can handle this exception. The caller analyses the func return
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values. */
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if (!caught)
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return val;
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if (!caught || (mask & RETURN_MASK (caught)))
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{
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*func_val = val;
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*func_caught = caught;
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return;
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}
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/* If the caller didn't request that the event be caught, relay the
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/* The caller didn't request that the event be caught, relay the
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event to the next containing catch_errors(). */
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if (!(mask & RETURN_MASK (caught)))
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return_to_top_level (caught);
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return_to_top_level (caught);
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}
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/* Tell the caller that an event was caught.
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int
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catch_exceptions (struct ui_out *uiout,
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catch_exceptions_ftype *func,
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void *func_args,
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char *errstring,
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return_mask mask)
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{
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int val;
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enum return_reason caught;
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catcher (func, uiout, func_args, &val, &caught, errstring, mask);
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gdb_assert (val >= 0);
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gdb_assert (caught <= 0);
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if (caught < 0)
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return caught;
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return val;
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}
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FIXME: nsd/2000-02-22: When MASK is RETURN_MASK_ALL, the caller
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can't tell what type of event occurred.
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struct catch_errors_args
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{
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catch_errors_ftype *func;
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void *func_args;
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};
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A possible fix is to add a new interface, catch_event(), that
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returns enum return_reason after catching an error or a quit.
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int
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do_catch_errors (struct ui_out *uiout, void *data)
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{
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struct catch_errors_args *args = data;
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return args->func (args->func_args);
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}
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When returning normally, i.e. without catching an error or a
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quit, catch_event() could return RETURN_NORMAL, which would be
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added to enum return_reason. FUNC would return information
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exclusively via ARGS.
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Alternatively, normal catch_event() could return FUNC's return
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value. The caller would need to be aware of potential overlap
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with enum return_reason, which could be publicly restricted to
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negative values to simplify return value processing in FUNC and
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in the caller. */
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return 0;
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int
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catch_errors (catch_errors_ftype *func, void *func_args, char *errstring,
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return_mask mask)
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{
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int val;
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enum return_reason caught;
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struct catch_errors_args args;
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args.func = func;
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args.func_args = func_args;
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catcher (do_catch_errors, uiout, &args, &val, &caught, errstring, mask);
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if (caught != 0)
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return 0;
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return val;
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}
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struct captured_command_args
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