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60250e8b AC |
1 | /* Exception (throw catch) mechanism, for GDB, the GNU debugger. |
2 | ||
3 | Copyright 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, | |
4 | 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software | |
5 | Foundation, Inc. | |
6 | ||
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 2 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 59 Temple Place - Suite 330, | |
22 | Boston, MA 02111-1307, USA. */ | |
23 | ||
24 | #ifndef EXCEPTIONS_H | |
25 | #define EXCEPTIONS_H | |
26 | ||
2a78bfb5 | 27 | /* Reasons for calling throw_exceptions(). NOTE: all reason values |
60250e8b AC |
28 | must be less than zero. enum value 0 is reserved for internal use |
29 | as the return value from an initial setjmp(). The function | |
30 | catch_exceptions() reserves values >= 0 as legal results from its | |
31 | wrapped function. */ | |
32 | ||
33 | enum return_reason | |
34 | { | |
35 | /* User interrupt. */ | |
36 | RETURN_QUIT = -2, | |
37 | /* Any other error. */ | |
38 | RETURN_ERROR | |
39 | }; | |
40 | ||
41 | #define RETURN_MASK(reason) (1 << (int)(-reason)) | |
42 | #define RETURN_MASK_QUIT RETURN_MASK (RETURN_QUIT) | |
43 | #define RETURN_MASK_ERROR RETURN_MASK (RETURN_ERROR) | |
44 | #define RETURN_MASK_ALL (RETURN_MASK_QUIT | RETURN_MASK_ERROR) | |
45 | typedef int return_mask; | |
46 | ||
2a78bfb5 AC |
47 | /* Describe all exceptions. */ |
48 | ||
49 | enum errors { | |
50 | NO_ERROR, | |
51 | /* Any generic error, the corresponding text is in | |
52 | exception.message. */ | |
53 | GENERIC_ERROR, | |
54 | /* Add more errors here. */ | |
55 | NR_ERRORS | |
56 | }; | |
57 | ||
58 | struct exception | |
59 | { | |
60 | enum return_reason reason; | |
61 | enum errors error; | |
62 | char *message; | |
63 | }; | |
64 | ||
c1043fc2 AC |
65 | /* A pre-defined non-exception. */ |
66 | extern const struct exception exception_none; | |
67 | ||
2a78bfb5 AC |
68 | /* Throw an exception (as described by "struct exception"). Will |
69 | execute a LONG JUMP to the inner most containing exception handler | |
70 | established using catch_exceptions() (or similar). | |
60250e8b AC |
71 | |
72 | Code normally throws an exception using error() et.al. For various | |
73 | reaons, GDB also contains code that throws an exception directly. | |
74 | For instance, the remote*.c targets contain CNTRL-C signal handlers | |
75 | that propogate the QUIT event up the exception chain. ``This could | |
2a78bfb5 AC |
76 | be a good thing or a dangerous thing.'' -- the Existential |
77 | Wombat. */ | |
78 | ||
79 | extern NORETURN void throw_exception (struct exception exception) ATTR_NORETURN; | |
80 | extern NORETURN void throw_reason (enum return_reason reason) ATTR_NORETURN; | |
6b1b7650 AC |
81 | extern NORETURN void throw_verror (enum errors, const char *fmt, |
82 | va_list ap) ATTR_NORETURN; | |
83 | extern NORETURN void throw_vfatal (const char *fmt, va_list ap) ATTR_NORETURN; | |
84 | extern NORETURN void throw_vsilent (const char *fmt, va_list ap) ATTR_NORETURN; | |
60250e8b | 85 | |
60250e8b AC |
86 | |
87 | /* Call FUNC(UIOUT, FUNC_ARGS) but wrapped within an exception | |
88 | handler. If an exception (enum return_reason) is thrown using | |
89 | throw_exception() than all cleanups installed since | |
90 | catch_exceptions() was entered are invoked, the (-ve) exception | |
91 | value is then returned by catch_exceptions. If FUNC() returns | |
92 | normally (with a postive or zero return value) then that value is | |
93 | returned by catch_exceptions(). It is an internal_error() for | |
94 | FUNC() to return a negative value. | |
95 | ||
96 | For the period of the FUNC() call: UIOUT is installed as the output | |
97 | builder; ERRSTRING is installed as the error/quit message; and a | |
98 | new cleanup_chain is established. The old values are restored | |
99 | before catch_exceptions() returns. | |
100 | ||
101 | The variant catch_exceptions_with_msg() is the same as | |
102 | catch_exceptions() but adds the ability to return an allocated | |
103 | copy of the gdb error message. This is used when a silent error is | |
104 | issued and the caller wants to manually issue the error message. | |
105 | ||
106 | FIXME; cagney/2001-08-13: The need to override the global UIOUT | |
107 | builder variable should just go away. | |
108 | ||
109 | This function superseeds catch_errors(). | |
110 | ||
111 | This function uses SETJMP() and LONGJUMP(). */ | |
112 | ||
113 | struct ui_out; | |
114 | typedef int (catch_exceptions_ftype) (struct ui_out *ui_out, void *args); | |
115 | extern int catch_exceptions (struct ui_out *uiout, | |
116 | catch_exceptions_ftype *func, void *func_args, | |
117 | char *errstring, return_mask mask); | |
2a78bfb5 | 118 | typedef void (catch_exception_ftype) (struct ui_out *ui_out, void *args); |
60250e8b AC |
119 | extern int catch_exceptions_with_msg (struct ui_out *uiout, |
120 | catch_exceptions_ftype *func, | |
121 | void *func_args, | |
122 | char *errstring, char **gdberrmsg, | |
123 | return_mask mask); | |
2a78bfb5 AC |
124 | extern struct exception catch_exception (struct ui_out *uiout, |
125 | catch_exception_ftype *func, | |
126 | void *func_args, | |
127 | return_mask mask); | |
60250e8b AC |
128 | |
129 | /* If CATCH_ERRORS_FTYPE throws an error, catch_errors() returns zero | |
130 | otherwize the result from CATCH_ERRORS_FTYPE is returned. It is | |
131 | probably useful for CATCH_ERRORS_FTYPE to always return a non-zero | |
132 | value. It's unfortunate that, catch_errors() does not return an | |
133 | indication of the exact exception that it caught - quit_flag might | |
134 | help. | |
135 | ||
136 | This function is superseeded by catch_exceptions(). */ | |
137 | ||
138 | typedef int (catch_errors_ftype) (void *); | |
139 | extern int catch_errors (catch_errors_ftype *, void *, char *, return_mask); | |
140 | ||
141 | /* Template to catch_errors() that wraps calls to command | |
142 | functions. */ | |
143 | ||
144 | typedef void (catch_command_errors_ftype) (char *, int); | |
145 | extern int catch_command_errors (catch_command_errors_ftype *func, char *command, int from_tty, return_mask); | |
146 | ||
147 | #endif |