-/*
+/* ex - Exception Handling */
+
+/* Copyright (c) 2005-2010 The SimGrid team */
+/* Copyright (c) 2002-2004 Ralf S. Engelschall <rse@engelschall.com> */
+/* Copyright (c) 2002-2004 The OSSP Project <http://www.ossp.org/> */
+/* Copyright (c) 2002-2004 Cable & Wireless <http://www.cw.com/> */
+/* All rights reserved. */
+
+/* This code is inspirated from the OSSP version (as retrieved back in 2004)*/
+/* It was heavily modified to fit the SimGrid framework. */
+
+/* The OSSP version has the following copyright notice:
** OSSP ex - Exception Handling
** Copyright (c) 2002-2004 Ralf S. Engelschall <rse@engelschall.com>
** Copyright (c) 2002-2004 The OSSP Project <http://www.ossp.org/>
** the above copyright notice and this permission notice appear in all
** copies.
**
-** THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+** THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESSED OR IMPLIED
** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHORS AND COPYRIGHT HOLDERS AND THEIR
** OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
** OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
** SUCH DAMAGE.
-**
-** ex.c: exception handling (compiler part)
-*/
+ */
+
+/* The extensions made for the SimGrid project can either be distributed */
+/* under the same license, or under the LGPL v2.1 */
#include <stdio.h>
#include <stdlib.h>
+#include "portable.h" /* execinfo when available */
#include "xbt/ex.h"
+#include "xbt/str.h"
+#include "xbt/module.h" /* xbt_binary_name */
+#include "xbt_modinter.h" /* backtrace initialization headers */
+#include "xbt/synchro.h" /* xbt_thread_self */
+
+#include "gras/Virtu/virtu_interface.h" /* gras_os_myname */
+#include "xbt/ex_interface.h"
+
+#undef HAVE_BACKTRACE
+#if defined(HAVE_EXECINFO_H) && defined(HAVE_POPEN) && defined(ADDR2LINE)
+# define HAVE_BACKTRACE 1 /* Hello linux box */
+#endif
+
+#if defined(_XBT_WIN32) && defined(_M_IX86) && !defined(__GNUC__)
+# define HAVE_BACKTRACE 1 /* Hello x86 windows box */
+#endif
+
+
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_ex, xbt, "Exception mecanism");
/* default __ex_ctx callback function */
-ex_ctx_t *__ex_ctx_default(void)
+xbt_running_ctx_t *__xbt_ex_ctx_default(void)
{
- static ex_ctx_t ctx = EX_CTX_INITIALIZER;
+ /* Don't scream: this is a default which is never used (so, yes,
+ there is one setjump container by running entity).
+
+ This default gets overriden in xbt/xbt_os_thread.c so that it works in
+ real life and in simulation when using threads to implement the simulation
+ processes (ie, with pthreads and on windows).
+
+ It also gets overriden in xbt/context.c when using ucontextes (as well as
+ in Java for now, but after the java overhaul, it will get cleaned out)
+ */
+ static xbt_running_ctx_t ctx = XBT_RUNNING_CTX_INITIALIZER;
+
+ return &ctx;
+}
+
+/* Change raw libc symbols to file names and line numbers */
+void xbt_ex_setup_backtrace(xbt_ex_t * e);
+
+void xbt_backtrace_display(xbt_ex_t * e)
+{
+ xbt_ex_setup_backtrace(e);
+
+#ifdef HAVE_BACKTRACE
+ if (e->used == 0) {
+ fprintf(stderr, "(backtrace not set)\n");
+ } else {
+ int i;
+
+ fprintf(stderr, "Backtrace (displayed in thread %p):\n",
+ (void *) xbt_thread_self());
+ for (i = 1; i < e->used; i++) /* no need to display "xbt_display_backtrace" */
+ fprintf(stderr, "---> %s\n", e->bt_strings[i] + 4);
+ }
+
+ /* don't fool xbt_ex_free with uninitialized msg field */
+ e->msg = NULL;
+ e->remote = 0;
+ xbt_ex_free(*e);
+#else
- return &ctx;
+ ERROR0("No backtrace on this arch");
+#endif
}
+/** \brief show the backtrace of the current point (lovely while debuging) */
+void xbt_backtrace_display_current(void)
+{
+ xbt_ex_t e;
+ xbt_backtrace_current(&e);
+ xbt_backtrace_display(&e);
+}
+
+#if defined(HAVE_EXECINFO_H) && defined(HAVE_POPEN) && defined(ADDR2LINE)
+# include "backtrace_linux.c"
+#elif (defined(_XBT_WIN32) && defined (_M_IX86)) && !defined(__GNUC__)
+# include "backtrace_windows.c"
+#else
+# include "backtrace_dummy.c"
+#endif
+
+/** @brief shows an exception content and the associated stack if available */
+void xbt_ex_display(xbt_ex_t * e)
+{
+ char *thrower = NULL;
+
+ if (e->remote)
+ thrower = bprintf(" on host %s(%d)", e->host, e->pid);
+
+ fprintf(stderr,
+ "** SimGrid: UNCAUGHT EXCEPTION received on %s(%d): category: %s; value: %d\n"
+ "** %s\n"
+ "** Thrown by %s()%s\n",
+ gras_os_myname(), (*xbt_getpid) (),
+ xbt_ex_catname(e->category), e->value, e->msg,
+ e->procname, thrower ? thrower : " in this process");
+ CRITICAL1("%s", e->msg);
+
+ if (!e->remote && !e->bt_strings)
+ xbt_ex_setup_backtrace(e);
+
+#ifdef HAVE_BACKTRACE
+ /* We have everything to build neat backtraces */
+ {
+ int i;
+
+ if (!xbt_binary_name) {
+ fprintf(stderr, "variable 'xbt_binary_name' set to NULL. Cannot compute the backtrace\n");
+ return;
+ }
+ fprintf(stderr, "\n");
+ for (i = 0; i < e->used; i++)
+ fprintf(stderr, "%s\n", e->bt_strings[i]);
+
+ }
+#else
+ fprintf(stderr, " at %s:%d:%s (no backtrace available on that arch)\n",
+ e->file, e->line, e->func);
+#endif
+}
+
+
/* default __ex_terminate callback function */
-void __ex_terminate_default(ex_t *e)
+void __xbt_ex_terminate_default(xbt_ex_t * e)
{
- fprintf(stderr,
- "**EX: UNCAUGHT EXCEPTION: "
- "class=0x%lx object=0x%lx value=0x%lx [%s:%d@%s]\n",
- (long)((e)->ex_class), (long)((e)->ex_object), (long)((e)->ex_value),
- (e)->ex_file, (e)->ex_line, (e)->ex_func);
- abort();
+ xbt_ex_display(e);
+
+ abort();
}
/* the externally visible API */
-ex_ctx_cb_t __ex_ctx = &__ex_ctx_default;
-ex_term_cb_t __ex_terminate = &__ex_terminate_default;
+XBT_EXPORT_NO_IMPORT(xbt_running_ctx_fetcher_t) __xbt_running_ctx_fetch = &__xbt_ex_ctx_default;
+XBT_EXPORT_NO_IMPORT(ex_term_cb_t) __xbt_ex_terminate =
+ &__xbt_ex_terminate_default;
+
+
+void xbt_ex_free(xbt_ex_t e)
+{
+ int i;
+
+ if (e.msg)
+ free(e.msg);
+ if (e.remote) {
+ free(e.procname);
+ free(e.file);
+ free(e.func);
+ free(e.host);
+ }
+
+ if (e.bt_strings) {
+ for (i = 0; i < e.used; i++)
+ free((char *) e.bt_strings[i]);
+ free((char **) e.bt_strings);
+ }
+ /* memset(e,0,sizeof(xbt_ex_t)); */
+}
+
+/** \brief returns a short name for the given exception category */
+const char *xbt_ex_catname(xbt_errcat_t cat)
+{
+ switch (cat) {
+ case unknown_error:
+ return "unknown_err";
+ case arg_error:
+ return "invalid_arg";
+ case mismatch_error:
+ return "mismatch";
+ case not_found_error:
+ return "not found";
+ case system_error:
+ return "system_err";
+ case network_error:
+ return "network_err";
+ case timeout_error:
+ return "timeout";
+ case thread_error:
+ return "thread_err";
+ default:
+ return "INVALID_ERR";
+ }
+}
+
+
+#ifdef SIMGRID_TEST
+#include <stdio.h>
+#include "xbt/ex.h"
+
+XBT_TEST_SUITE("xbt_ex", "Exception Handling");
+
+XBT_TEST_UNIT("controlflow", test_controlflow, "basic nested control flow")
+{
+ xbt_ex_t ex;
+ volatile int n = 1;
+ xbt_test_add0("basic nested control flow");
+
+ TRY {
+ if (n != 1)
+ xbt_test_fail1("M1: n=%d (!= 1)", n);
+ n++;
+ TRY {
+ if (n != 2)
+ xbt_test_fail1("M2: n=%d (!= 2)", n);
+ n++;
+ THROW0(unknown_error, 0, "something");
+ }
+ CATCH(ex) {
+ if (n != 3)
+ xbt_test_fail1("M3: n=%d (!= 3)", n);
+ n++;
+ xbt_ex_free(ex);
+ }
+ n++;
+ TRY {
+ if (n != 5)
+ xbt_test_fail1("M2: n=%d (!= 5)", n);
+ n++;
+ THROW0(unknown_error, 0, "something");
+ }
+ CATCH(ex) {
+ if (n != 6)
+ xbt_test_fail1("M3: n=%d (!= 6)", n);
+ n++;
+ RETHROW;
+ n++;
+ }
+ xbt_test_fail1("MX: n=%d (shouldn't reach this point)", n);
+ }
+ CATCH(ex) {
+ if (n != 7)
+ xbt_test_fail1("M4: n=%d (!= 7)", n);
+ n++;
+ xbt_ex_free(ex);
+ }
+ if (n != 8)
+ xbt_test_fail1("M5: n=%d (!= 8)", n);
+}
+
+XBT_TEST_UNIT("value", test_value, "exception value passing")
+{
+ xbt_ex_t ex;
+
+ TRY {
+ THROW0(unknown_error, 2, "toto");
+ }
+ CATCH(ex) {
+ xbt_test_add0("exception value passing");
+ if (ex.category != unknown_error)
+ xbt_test_fail1("category=%d (!= 1)", ex.category);
+ if (ex.value != 2)
+ xbt_test_fail1("value=%d (!= 2)", ex.value);
+ if (strcmp(ex.msg, "toto"))
+ xbt_test_fail1("message=%s (!= toto)", ex.msg);
+ xbt_ex_free(ex);
+ }
+}
+
+XBT_TEST_UNIT("variables", test_variables, "variable value preservation")
+{
+ xbt_ex_t ex;
+ int r1, r2;
+ volatile int v1, v2;
+
+ r1 = r2 = v1 = v2 = 1234;
+ TRY {
+ r2 = 5678;
+ v2 = 5678;
+ THROW0(unknown_error, 0, "toto");
+ } CATCH(ex) {
+ xbt_test_add0("variable preservation");
+ if (r1 != 1234)
+ xbt_test_fail1("r1=%d (!= 1234)", r1);
+ if (v1 != 1234)
+ xbt_test_fail1("v1=%d (!= 1234)", v1);
+ /* r2 is allowed to be destroyed because not volatile */
+ if (v2 != 5678)
+ xbt_test_fail1("v2=%d (!= 5678)", v2);
+ xbt_ex_free(ex);
+ }
+}
+
+XBT_TEST_UNIT("cleanup", test_cleanup, "cleanup handling")
+{
+ xbt_ex_t ex;
+ volatile int v1;
+ int c;
+
+ xbt_test_add0("cleanup handling");
+
+ v1 = 1234;
+ c = 0;
+ TRY {
+ v1 = 5678;
+ THROW0(1, 2, "blah");
+ } TRY_CLEANUP {
+ if (v1 != 5678)
+ xbt_test_fail1("v1 = %d (!= 5678)", v1);
+ c = 1;
+ }
+ CATCH(ex) {
+ if (v1 != 5678)
+ xbt_test_fail1("v1 = %d (!= 5678)", v1);
+ if (!(ex.category == 1 && ex.value == 2 && !strcmp(ex.msg, "blah")))
+ xbt_test_fail0("unexpected exception contents");
+ xbt_ex_free(ex);
+ }
+ if (!c)
+ xbt_test_fail0("xbt_ex_free not executed");
+}
+
+
+/*
+ * The following is the example included in the documentation. It's a good
+ * idea to check its syntax even if we don't try to run it.
+ * And actually, it allows to put comments in the code despite doxygen.
+ */
+static char *mallocex(int size)
+{
+ return NULL;
+}
+
+#define SMALLAMOUNT 10
+#define TOOBIG 100000000
+
+#if 0 /* this contains syntax errors, actually */
+static void bad_example(void)
+{
+ struct {
+ char *first;
+ } *globalcontext;
+ ex_t ex;
+
+ /* BAD_EXAMPLE */
+ TRY {
+ char *cp1, *cp2, *cp3;
+
+ cp1 = mallocex(SMALLAMOUNT);
+ globalcontext->first = cp1;
+ cp2 = mallocex(TOOBIG);
+ cp3 = mallocex(SMALLAMOUNT);
+ strcpy(cp1, "foo");
+ strcpy(cp2, "bar");
+ } TRY_CLEANUP {
+ if (cp3 != NULL)
+ free(cp3);
+ if (cp2 != NULL)
+ free(cp2);
+ if (cp1 != NULL)
+ free(cp1);
+ }
+ CATCH(ex) {
+ printf("cp3=%s", cp3);
+ RETHROW;
+ }
+ /* end_of_bad_example */
+}
+#endif
+typedef struct {
+ char *first;
+} global_context_t;
+
+static void good_example(void)
+{
+ global_context_t *global_context = malloc(sizeof(global_context_t));
+ xbt_ex_t ex;
+
+ /* GOOD_EXAMPLE */
+ { /*01 */
+ char *volatile /*03 */ cp1 = NULL /*02 */ ;
+ char *volatile /*03 */ cp2 = NULL /*02 */ ;
+ char *volatile /*03 */ cp3 = NULL /*02 */ ;
+ TRY {
+ cp1 = mallocex(SMALLAMOUNT);
+ global_context->first = cp1;
+ cp1 = NULL /*05 give away */ ;
+ cp2 = mallocex(TOOBIG);
+ cp3 = mallocex(SMALLAMOUNT);
+ strcpy(cp1, "foo");
+ strcpy(cp2, "bar");
+ } TRY_CLEANUP { /*04 */
+ printf("cp3=%s", cp3 == NULL /*02 */ ? "" : cp3);
+ if (cp3 != NULL)
+ free(cp3);
+ if (cp2 != NULL)
+ free(cp2);
+ /*05 cp1 was given away */
+ }
+ CATCH(ex) {
+ /*05 global context untouched */
+ RETHROW;
+ }
+ }
+ /* end_of_good_example */
+}
+#endif /* SIMGRID_TEST */
