/* Exception (throw catch) mechanism, for GDB, the GNU debugger.
- Copyright (C) 1986-2013 Free Software Foundation, Inc.
+ Copyright (C) 1986-2019 Free Software Foundation, Inc.
This file is part of GDB.
#define EXCEPTIONS_H
#include "ui-out.h"
-#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
- catch_exceptions() reserves values >= 0 as legal results from its
- wrapped function. */
-
-enum return_reason
- {
- /* User interrupt. */
- RETURN_QUIT = -2,
- /* Any other error. */
- RETURN_ERROR
- };
-
-#define RETURN_MASK(reason) (1 << (int)(-reason))
-#define RETURN_MASK_QUIT RETURN_MASK (RETURN_QUIT)
-#define RETURN_MASK_ERROR RETURN_MASK (RETURN_ERROR)
-#define RETURN_MASK_ALL (RETURN_MASK_QUIT | RETURN_MASK_ERROR)
-typedef int return_mask;
-
-/* Describe all exceptions. */
-
-enum errors {
- GDB_NO_ERROR,
-
- /* Any generic error, the corresponding text is in
- exception.message. */
- GENERIC_ERROR,
-
- /* Something requested was not found. */
- NOT_FOUND_ERROR,
-
- /* Thread library lacks support necessary for finding thread local
- storage. */
- TLS_NO_LIBRARY_SUPPORT_ERROR,
-
- /* Load module not found while attempting to find thread local storage. */
- TLS_LOAD_MODULE_NOT_FOUND_ERROR,
-
- /* Thread local storage has not been allocated yet. */
- TLS_NOT_ALLOCATED_YET_ERROR,
-
- /* Something else went wrong while attempting to find thread local
- storage. The ``struct gdb_exception'' message field provides
- more detail. */
- TLS_GENERIC_ERROR,
-
- /* Problem parsing an XML document. */
- XML_PARSE_ERROR,
-
- /* Error accessing memory. */
- MEMORY_ERROR,
-
- /* Feature is not supported in this copy of GDB. */
- UNSUPPORTED_ERROR,
-
- /* Value not available. E.g., a register was not collected in a
- traceframe. */
- NOT_AVAILABLE_ERROR,
-
- /* DW_OP_GNU_entry_value resolving failed. */
- NO_ENTRY_VALUE_ERROR,
-
- /* Target throwing an error has been closed. Current command should be
- aborted as the inferior state is no longer valid. */
- TARGET_CLOSE_ERROR,
-
- /* Add more errors here. */
- NR_ERRORS
-};
-
-struct gdb_exception
-{
- enum return_reason reason;
- enum errors error;
- const char *message;
-};
-
-/* A pre-defined non-exception. */
-extern const struct gdb_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 (volatile struct
- gdb_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 gdb_exception e;
- TRY_CATCH (e, RETURN_MASK_ERROR)
- {
- }
- switch (e.reason)
- {
- case RETURN_ERROR: ...
- }
-
- */
-
-#define TRY_CATCH(EXCEPTION,MASK) \
- { \
- EXCEPTIONS_SIGJMP_BUF *buf = \
- exceptions_state_mc_init (&(EXCEPTION), (MASK)); \
- EXCEPTIONS_SIGSETJMP (*buf); \
- } \
- while (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... */
const char *prefix,
...) ATTRIBUTE_PRINTF (3, 4);
-/* Throw an exception (as described by "struct gdb_exception"). Will
- execute a LONG JUMP to the inner most containing exception handler
- established using catch_exceptions() (or similar).
-
- Code normally throws an exception using error() et.al. For various
- reaons, GDB also contains code that throws an exception directly.
- For instance, the remote*.c targets contain CNTRL-C signal handlers
- that propogate the QUIT event up the exception chain. ``This could
- be a good thing or a dangerous thing.'' -- the Existential
- Wombat. */
-
-extern void throw_exception (struct gdb_exception exception)
- ATTRIBUTE_NORETURN;
-extern void throw_verror (enum errors, const char *fmt, va_list ap)
- ATTRIBUTE_NORETURN ATTRIBUTE_PRINTF (2, 0);
-extern void throw_vfatal (const char *fmt, va_list ap)
- ATTRIBUTE_NORETURN ATTRIBUTE_PRINTF (1, 0);
-extern void throw_error (enum errors error, const char *fmt, ...)
- ATTRIBUTE_NORETURN ATTRIBUTE_PRINTF (2, 3);
-
-/* Instead of deprecated_throw_reason, code should use
- throw_exception. */
-extern void deprecated_throw_reason (enum return_reason reason)
- ATTRIBUTE_NORETURN;
-
-/* Call FUNC(UIOUT, FUNC_ARGS) but wrapped within an exception
- handler. If an exception (enum return_reason) is thrown using
- throw_exception() than all cleanups installed since
- catch_exceptions() was entered are invoked, the (-ve) exception
- value is then returned by catch_exceptions. If FUNC() returns
- normally (with a positive or zero return value) then that value is
- returned by catch_exceptions(). It is an internal_error() for
- FUNC() to return a negative value.
-
- For the period of the FUNC() call: UIOUT is installed as the output
- builder; ERRSTRING is installed as the error/quit message; and a
- new cleanup_chain is established. The old values are restored
- before catch_exceptions() returns.
-
- The variant catch_exceptions_with_msg() is the same as
- catch_exceptions() but adds the ability to return an allocated
- copy of the gdb error message. This is used when a silent error is
- issued and the caller wants to manually issue the error message.
-
- MASK specifies what to catch; it is normally set to
- RETURN_MASK_ALL, if for no other reason than that the code which
- calls catch_errors might not be set up to deal with a quit which
- isn't caught. But if the code can deal with it, it generally
- should be RETURN_MASK_ERROR, unless for some reason it is more
- useful to abort only the portion of the operation inside the
- catch_errors. Note that quit should return to the command line
- fairly quickly, even if some further processing is being done.
-
- FIXME; cagney/2001-08-13: The need to override the global UIOUT
- builder variable should just go away.
-
- This function supersedes catch_errors().
-
- This function uses SETJMP() and LONGJUMP(). */
-
-struct ui_out;
-typedef int (catch_exceptions_ftype) (struct ui_out *ui_out, void *args);
-extern int catch_exceptions (struct ui_out *uiout,
- catch_exceptions_ftype *func, void *func_args,
- return_mask mask);
-typedef void (catch_exception_ftype) (struct ui_out *ui_out, void *args);
-extern int catch_exceptions_with_msg (struct ui_out *uiout,
- catch_exceptions_ftype *func,
- void *func_args,
- char **gdberrmsg,
- return_mask mask);
-
-/* If CATCH_ERRORS_FTYPE throws an error, catch_errors() returns zero
- otherwize the result from CATCH_ERRORS_FTYPE is returned. It is
- probably useful for CATCH_ERRORS_FTYPE to always return a non-zero
- value. It's unfortunate that, catch_errors() does not return an
- indication of the exact exception that it caught - quit_flag might
- help.
-
- This function is superseded by catch_exceptions(). */
-
-typedef int (catch_errors_ftype) (void *);
-extern int catch_errors (catch_errors_ftype *, void *, char *, return_mask);
-
-/* Template to catch_errors() that wraps calls to command
- functions. */
-
-typedef void (catch_command_errors_ftype) (char *, int);
-extern int catch_command_errors (catch_command_errors_ftype *func,
- char *command, int from_tty, return_mask);
-
+/* Compare two exception objects for print equality. */
+extern int exception_print_same (struct gdb_exception e1,
+ struct gdb_exception e2);
#endif
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