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except.h
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1/*
2 * Portable Exception Handling for ANSI C.
3 * Copyright (C) 1999 Kaz Kylheku <kaz@ashi.footprints.net>
4 *
5 * Free Software License:
6 *
7 * All rights are reserved by the author, with the following exceptions:
8 * Permission is granted to freely reproduce and distribute this software,
9 * possibly in exchange for a fee, provided that this copyright notice appears
10 * intact. Permission is also granted to adapt this software to produce
11 * derivative works, as long as the modified versions carry this copyright
12 * notice and additional notices stating that the work has been modified.
13 * This source code may be translated into executable form and incorporated
14 * into proprietary software; there is no requirement for such software to
15 * contain a copyright notice related to this source.
16 *
17 */
18
30#ifndef XCEPT_H
31#define XCEPT_H
32
33#include <glib.h>
34#include <setjmp.h>
35#include <stdlib.h>
36#include <stdarg.h>
37#include <assert.h>
38#include "ws_symbol_export.h"
39#include "ws_attributes.h"
40
41#define XCEPT_GROUP_ANY 0
42#define XCEPT_CODE_ANY 0
43#define XCEPT_BAD_ALLOC 1
44
45#ifdef __cplusplus
46extern "C" {
47#endif
48
49enum { except_no_call, except_call };
50
51 typedef struct {
52 unsigned long except_group;
53 unsigned long except_code;
54} except_id_t;
55
56 typedef struct {
57 except_id_t volatile except_id;
58 const char *volatile except_message;
59 void *volatile except_dyndata;
60} except_t;
61
62 struct except_cleanup {
63 void (*except_func)(void *);
64 void *except_context;
65};
66
67 struct except_catch {
68 const except_id_t *except_id;
69 size_t except_size;
70 except_t except_obj;
71 jmp_buf except_jmp;
72};
73
74enum except_stacktype {
75 XCEPT_CLEANUP, XCEPT_CATCHER
76};
77
85 struct except_stacknode {
86 struct except_stacknode *except_down;
87 enum except_stacktype except_type;
88 union {
89 struct except_catch *except_catcher;
90 struct except_cleanup *except_cleanup;
91 } except_info;
92};
93
94/* private functions made external so they can be used in macros */
95WS_DLL_PUBLIC void except_setup_clean(struct except_stacknode *,
96 struct except_cleanup *, void (*)(void *), void *);
97WS_DLL_PUBLIC void except_setup_try(struct except_stacknode *,
98 struct except_catch *, const except_id_t [], size_t);
99WS_DLL_PUBLIC struct except_stacknode *except_pop(void);
100
101/* public interface functions */
102WS_DLL_PUBLIC int except_init(void);
103WS_DLL_PUBLIC void except_deinit(void);
104WS_DLL_PUBLIC WS_NORETURN void except_rethrow(except_t *);
105WS_DLL_PUBLIC WS_NORETURN void except_throw(long, long, const char *);
106WS_DLL_PUBLIC WS_NORETURN void except_throwd(long, long, const char *, void *);
107WS_DLL_PUBLIC WS_NORETURN void except_vthrowf(long group, long code, const char *fmt, va_list vl);
108WS_DLL_PUBLIC WS_NORETURN void except_throwf(long, long, const char *, ...)
109 G_GNUC_PRINTF(3, 4);
110WS_DLL_PUBLIC void (*except_unhandled_catcher(void (*)(except_t *)))(except_t *);
111extern unsigned long except_code(except_t *);
112extern unsigned long except_group(except_t *);
113extern const char *except_message(except_t *);
114extern void *except_data(except_t *);
115WS_DLL_PUBLIC void *except_take_data(except_t *);
116WS_DLL_PUBLIC void except_set_allocator(void *(*)(size_t), void (*)(void *));
117WS_DLL_PUBLIC void *except_alloc(size_t);
118WS_DLL_PUBLIC void except_free(void *);
119
120#define except_code(E) ((E)->except_id.except_code)
121#define except_group(E) ((E)->except_id.except_group)
122#define except_message(E) ((E)->except_message)
123#define except_data(E) ((E)->except_dyndata)
124
125#ifdef __cplusplus
126}
127#endif
128
129/*
130 * void except_cleanup_push(void (*)(void *), void *);
131 * void except_cleanup_pop(int);
132 * void except_checked_cleanup_pop(void (*)(void *), int);
133 * void except_try_push(const except_id_t [], size_t, except_t **);
134 * void except_try_pop(void);
135 */
136
137#define except_cleanup_push(F, C) \
138 { \
139 struct except_stacknode except_sn; \
140 struct except_cleanup except_cl; \
141 except_setup_clean(&except_sn, &except_cl, F, C)
142
143#define except_cleanup_pop(E) \
144 except_pop(); \
145 if (E) \
146 except_cl.except_func(except_cl.except_context); \
147 }
148
149#define except_checked_cleanup_pop(F, E) \
150 except_pop(); \
151 assert (except_cl.except_func == (F)); \
152 if (E) \
153 except_cl.except_func(except_cl.except_context); \
154 }
155
156
157/* --- Variants to allow nesting of except_cleanup_push w/o "shadowing" variables */
158#define except_cleanup_push_pfx(pfx, F, C) \
159 { \
160 struct except_stacknode pfx##_except_sn; \
161 struct except_cleanup pfx##_except_cl; \
162 except_setup_clean(&pfx##_except_sn, &pfx##_except_cl, F, C)
163
164#define except_cleanup_pop_pfx(pfx, E) \
165 except_pop(); \
166 if (E) \
167 pfx##_except_cl.except_func(pfx##_except_cl.except_context);\
168 }
169
170#define except_checked_cleanup_pop_pfx(pfx, F, E) \
171 except_pop(); \
172 assert (pfx##_except_cl.except_func == (F)); \
173 if (E) \
174 pfx##_except_cl.except_func(pfx##_except_cl.except_context);\
175 }
176/* ---------- */
177
178
179#define except_try_push(ID, NUM, PPE) \
180 { \
181 struct except_stacknode except_sn; \
182 struct except_catch except_ch; \
183 except_setup_try(&except_sn, &except_ch, ID, NUM); \
184 if (setjmp(except_ch.except_jmp)) \
185 *(PPE) = &except_ch.except_obj; \
186 else \
187 *(PPE) = 0
188
189#define except_try_pop() \
190 except_free(except_ch.except_obj.except_dyndata); \
191 except_pop(); \
192 }
193
194#endif /* XCEPT_H */
195
196/*
197 * Editor modelines - https://www.wireshark.org/tools/modelines.html
198 *
199 * Local variables:
200 * c-basic-offset: 4
201 * tab-width: 8
202 * indent-tabs-mode: nil
203 * End:
204 *
205 * vi: set shiftwidth=4 tabstop=8 expandtab:
206 * :indentSize=4:tabSize=8:noTabs=true:
207 */
except_catch
Definition except.h:67
except_cleanup
Definition except.h:62
except_id_t
Definition except.h:51
except_stacknode
Represents a node in the exception handling stack.
Definition except.h:85
except_stacknode::except_cleanup
struct except_cleanup * except_cleanup
Definition except.h:90
except_stacknode::except_type
enum except_stacktype except_type
Definition except.h:87
except_stacknode::except_down
struct except_stacknode * except_down
Definition except.h:86
except_stacknode::except_catcher
struct except_catch * except_catcher
Definition except.h:89
except_t
Definition except.h:56