2 ** OSSP ex - Exception Handling (modified to fit into SimGrid)
3 ** Copyright (c) 2005 Martin Quinson
4 ** Copyright (c) 2002-2004 Ralf S. Engelschall <rse@engelschall.com>
5 ** Copyright (c) 2002-2004 The OSSP Project <http://www.ossp.org/>
6 ** Copyright (c) 2002-2004 Cable & Wireless <http://www.cw.com/>
8 ** This file is part of OSSP ex, an exception handling library
9 ** which can be found at http://www.ossp.org/pkg/lib/ex/.
11 ** Permission to use, copy, modify, and distribute this software for
12 ** any purpose with or without fee is hereby granted, provided that
13 ** the above copyright notice and this permission notice appear in all
16 ** THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
17 ** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 ** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 ** IN NO EVENT SHALL THE AUTHORS AND COPYRIGHT HOLDERS AND THEIR
20 ** CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23 ** USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 ** ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 ** OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 ** OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 ** ex.c: exception handling (compiler part)
35 #include "portable.h" /* execinfo when available */
37 #include "xbt/module.h" /* xbt_binary_name */
39 #include "gras/Virtu/virtu_interface.h" /* gras_os_myname */
41 /* default __ex_ctx callback function */
42 ex_ctx_t *__xbt_ex_ctx_default(void) {
43 static ex_ctx_t ctx = XBT_CTX_INITIALIZER;
48 static void xbt_ex_setup_backtrace(xbt_ex_t *e) {
50 /* to get the backtrace from the libc */
51 char **backtrace = backtrace_symbols (e->bt, e->used);
53 /* To build the commandline of addr2line */
54 char *cmd = xbt_new(char,strlen(ADDR2LINE)+strlen(xbt_binary_name)+20*e->used);
57 /* to extract the addresses from the backtrace */
58 char **addrs=xbt_new(char*,e->used);
61 /* To read the output of addr2line */
63 char line_func[1024],line_pos[1024];
65 /* build the commandline */
66 curr += sprintf(curr,"%s -f -e %s ",ADDR2LINE,xbt_binary_name);
67 for (i=0; i<e->used;i++) {
68 /* retrieve this address */
69 snprintf(buff,256,"%s",strchr(backtrace[i],'[')+1);
72 addrs[i]=bprintf("%s",buff);
74 /* Add it to the command line args */
75 curr+=sprintf(curr,"%s ",addrs[i]);
78 /* parse the output and build a new backtrace */
79 e->bt_strings = xbt_new(char*,e->used);
81 pipe = popen(cmd, "r");
82 // xbt_assert(pipe);//,"Cannot fork addr2line to display the backtrace");
83 for (i=0; i<e->used; i++) {
84 fgets(line_func,1024,pipe);
85 line_func[strlen(line_func)-1]='\0';
86 fgets(line_pos,1024,pipe);
87 line_pos[strlen(line_pos)-1]='\0';
89 e->bt_strings[i] = bprintf("** At %s: %s (%s)", addrs[i], line_func,line_pos);
97 /** @brief shows an exception content and the associated stack if available */
98 void xbt_ex_display(xbt_ex_t *e) {
101 "** SimGrid: UNCAUGHT EXCEPTION on %s: category: %s; value: %d\n"
103 "** Thrown by %s%s%s",
105 xbt_ex_catname(e->category), e->value, e->msg,
106 e->procname, (e->host?"@":""),(e->host?e->host:""));
107 #if defined(HAVE_EXECINFO_H) && defined(HAVE_POPEN) && defined(ADDR2LINE)
108 /* We have everything to build neat backtraces */
112 fprintf(stderr,"\n");
114 xbt_ex_setup_backtrace(e);
115 for (i=0; i<e->used; i++)
116 printf("%s\n",e->bt_strings[i]);
120 fprintf(stderr," at %s:%d:%s (no backtrace available on that arch)\n", e->file,e->line,e->func);
125 /* default __ex_terminate callback function */
126 void __xbt_ex_terminate_default(xbt_ex_t *e) {
132 /* the externally visible API */
133 ex_ctx_cb_t __xbt_ex_ctx = &__xbt_ex_ctx_default;
134 ex_term_cb_t __xbt_ex_terminate = &__xbt_ex_terminate_default;
136 void xbt_ex_free(xbt_ex_t e) {
139 if (e.msg) free(e.msg);
146 /* locally, only one chunk of memory is allocated by the libc */
148 for (i=0; i<e.used; i++)
149 free(e.bt_strings[i]);
154 /** \brief returns a short name for the given exception category */
155 const char * xbt_ex_catname(xbt_errcat_t cat) {
157 case unknown_error: return "unknown_err";
158 case arg_error: return "invalid_arg";
159 case mismatch_error: return "mismatch";
160 case not_found_error: return "not found";
161 case system_error: return "system_err";
162 case network_error: return "network_err";
163 case timeout_error: return "timeout";
164 case thread_error: return "thread_err";
165 default: return "INVALID_ERR";
169 #ifndef HAVE_EXECINFO_H
170 /* dummy implementation. We won't use the result, but ex.h needs it to be defined */
171 int backtrace (void **__array, int __size) {
180 XBT_TEST_SUITE("xbt_ex","Exception Handling");
182 XBT_TEST_UNIT("controlflow",test_controlflow, "basic nested control flow") {
186 xbt_test_add0("basic nested control flow");
190 xbt_test_fail1("M1: n=%d (!= 1)", n);
194 xbt_test_fail1("M2: n=%d (!= 2)", n);
196 THROW0(unknown_error,0,"something");
199 xbt_test_fail1("M3: n=%d (!= 1)", n);
203 xbt_test_fail1("MX: n=%d (shouldn't reach this point)", n);
207 xbt_test_fail1("M4: n=%d (!= 4)", n);
212 xbt_test_fail1("M5: n=%d (!= 5)", n);
215 XBT_TEST_UNIT("value",test_value,"exception value passing") {
219 THROW0(unknown_error, 2, "toto");
221 xbt_test_add0("exception value passing");
222 if (ex.category != unknown_error)
223 xbt_test_fail1("category=%d (!= 1)", ex.category);
225 xbt_test_fail1("value=%d (!= 2)", ex.value);
226 if (strcmp(ex.msg,"toto"))
227 xbt_test_fail1("message=%s (!= toto)", ex.msg);
232 XBT_TEST_UNIT("variables",test_variables,"variable value preservation") {
237 r1 = r2 = v1 = v2 = 1234;
241 THROW0(unknown_error, 0, "toto");
243 xbt_test_add0("variable preservation");
245 xbt_test_fail1("r1=%d (!= 1234)", r1);
247 xbt_test_fail1("v1=%d (!= 1234)", v1);
248 /* r2 is allowed to be destroyed because not volatile */
250 xbt_test_fail1("v2=%d (!= 5678)", v2);
255 XBT_TEST_UNIT("cleanup",test_cleanup,"cleanup handling") {
260 xbt_test_add0("cleanup handling");
266 THROW0(1, 2, "blah");
269 xbt_test_fail1("v1 = %d (!= 5678)", v1);
273 xbt_test_fail1("v1 = %d (!= 5678)", v1);
274 if (!(ex.category == 1 && ex.value == 2 && !strcmp(ex.msg,"blah")))
275 xbt_test_fail0("unexpected exception contents");
279 xbt_test_fail0("xbt_ex_free not executed");
284 * The following is the example included in the documentation. It's a good
285 * idea to check its syntax even if we don't try to run it.
286 * And actually, it allows to put comments in the code despite doxygen.
288 static char *mallocex(int size) {
291 #define SMALLAMOUNT 10
292 #define TOOBIG 100000000
294 #if 0 /* this contains syntax errors, actually */
295 static void bad_example(void) {
296 struct {char*first;} *globalcontext;
301 char *cp1, *cp2, *cp3;
303 cp1 = mallocex(SMALLAMOUNT);
304 globalcontext->first = cp1;
305 cp2 = mallocex(TOOBIG);
306 cp3 = mallocex(SMALLAMOUNT);
310 if (cp3 != NULL) free(cp3);
311 if (cp2 != NULL) free(cp2);
312 if (cp1 != NULL) free(cp1);
314 printf("cp3=%s", cp3);
317 /* end_of_bad_example */
321 static void good_example(void) {
322 struct {char*first;} *globalcontext;
327 char * volatile /*03*/ cp1 = NULL /*02*/;
328 char * volatile /*03*/ cp2 = NULL /*02*/;
329 char * volatile /*03*/ cp3 = NULL /*02*/;
331 cp1 = mallocex(SMALLAMOUNT);
332 globalcontext->first = cp1;
333 cp1 = NULL /*05 give away*/;
334 cp2 = mallocex(TOOBIG);
335 cp3 = mallocex(SMALLAMOUNT);
339 printf("cp3=%s", cp3 == NULL /*02*/ ? "" : cp3);
344 /*05 cp1 was given away */
346 /*05 global context untouched */
350 /* end_of_good_example */
352 #endif /* SIMGRID_TEST */