1 /* Exception (throw catch) mechanism, for GDB, the GNU debugger.
3 Copyright (C) 1986-2017 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
25 /* If E is an exception, print it's error message on the specified
26 stream. For _fprintf, prefix the message with PREFIX... */
27 extern void exception_print (struct ui_file
*file
, struct gdb_exception e
);
28 extern void exception_fprintf (struct ui_file
*file
, struct gdb_exception e
,
30 ...) ATTRIBUTE_PRINTF (3, 4);
32 /* Call FUNC(UIOUT, FUNC_ARGS) but wrapped within an exception
33 handler. If an exception (enum return_reason) is thrown using
34 throw_exception() than all cleanups installed since
35 catch_exceptions() was entered are invoked, the (-ve) exception
36 value is then returned by catch_exceptions. If FUNC() returns
37 normally (with a positive or zero return value) then that value is
38 returned by catch_exceptions(). It is an internal_error() for
39 FUNC() to return a negative value.
41 For the period of the FUNC() call: UIOUT is installed as the output
42 builder; ERRSTRING is installed as the error/quit message; and a
43 new cleanup_chain is established. The old values are restored
44 before catch_exceptions() returns.
46 The variant catch_exceptions_with_msg() is the same as
47 catch_exceptions() but adds the ability to return an allocated
48 copy of the gdb error message. This is used when a silent error is
49 issued and the caller wants to manually issue the error message.
51 MASK specifies what to catch; it is normally set to
52 RETURN_MASK_ALL, if for no other reason than that the code which
53 calls catch_errors might not be set up to deal with a quit which
54 isn't caught. But if the code can deal with it, it generally
55 should be RETURN_MASK_ERROR, unless for some reason it is more
56 useful to abort only the portion of the operation inside the
57 catch_errors. Note that quit should return to the command line
58 fairly quickly, even if some further processing is being done.
60 FIXME; cagney/2001-08-13: The need to override the global UIOUT
61 builder variable should just go away.
63 This function supersedes catch_errors().
65 This function uses SETJMP() and LONGJUMP(). */
68 typedef int (catch_exceptions_ftype
) (struct ui_out
*ui_out
, void *args
);
69 extern int catch_exceptions (struct ui_out
*uiout
,
70 catch_exceptions_ftype
*func
, void *func_args
,
72 typedef void (catch_exception_ftype
) (struct ui_out
*ui_out
, void *args
);
73 extern int catch_exceptions_with_msg (struct ui_out
*uiout
,
74 catch_exceptions_ftype
*func
,
79 /* If CATCH_ERRORS_FTYPE throws an error, catch_errors() returns zero
80 otherwize the result from CATCH_ERRORS_FTYPE is returned. It is
81 probably useful for CATCH_ERRORS_FTYPE to always return a non-zero
82 value. It's unfortunate that, catch_errors() does not return an
83 indication of the exact exception that it caught - quit_flag might
86 This function is superseded by catch_exceptions(). */
88 typedef int (catch_errors_ftype
) (void *);
89 extern int catch_errors (catch_errors_ftype
*, void *, char *, return_mask
);
91 /* Compare two exception objects for print equality. */
92 extern int exception_print_same (struct gdb_exception e1
,
93 struct gdb_exception e2
);
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