X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/f3ef4ce507d9aa7d12da1d22373bf0bd052eb543..ac9b849c157154d379961e139bf8e1a436eb0bc1:/src/xbt/ex.c

diff --git a/src/xbt/ex.c b/src/xbt/ex.c
index af1e4a6838..18de35efee 100644
--- a/src/xbt/ex.c
+++ b/src/xbt/ex.c
@@ -31,10 +31,12 @@
 
 #include <stdio.h>
 #include <stdlib.h>
-#include <execinfo.h>
 
+#include "portable.h" /* execinfo when available */
 #include "xbt/ex.h"
 
+#include "gras/Virtu/virtu_interface.h" /* gras_os_myname */
+
 /* default __ex_ctx callback function */
 ex_ctx_t *__xbt_ex_ctx_default(void) {
     static ex_ctx_t ctx = XBT_CTX_INITIALIZER;
@@ -42,26 +44,37 @@ ex_ctx_t *__xbt_ex_ctx_default(void) {
     return &ctx;
 }
 
-/* default __ex_terminate callback function */
-void __xbt_ex_terminate_default(xbt_ex_t *e)  {
-  char **strings;
-  size_t i;
+/** @brief shows an exception content and the associated stack if available */
+void xbt_ex_display(xbt_ex_t *e)  {
 
   fprintf(stderr,
-	  "** SimGrid: UNCAUGHT EXCEPTION: category: %s; value: %d\n"
+	  "** SimGrid: UNCAUGHT EXCEPTION on %s: category: %s; value: %d\n"
 	  "** %s\n"
 	  "** Thrown by %s%s%s at %s:%d:%s\n",
+	  gras_os_myname(),
 	  xbt_ex_catname(e->category), e->value, e->msg,
-	  e->procname, (e->host?"@":""),(e->host?e->host:"localhost"),
+	  e->procname, (e->host?"@":""),(e->host?e->host:""),//localhost"),
 	  e->file,e->line,e->func);
 
+#ifdef HAVE_EXECINFO_H
+ {
+  int i;
+
   fprintf(stderr,"** Backtrace:\n");
-  strings = backtrace_symbols (e->bt, e->used);
+  if (!e->bt_strings)
+    e->bt_strings = backtrace_symbols (e->bt, e->used);
 
   for (i = 0; i < e->used; i++)
-     printf ("   %s\n", strings[i]);
+     printf ("   %s\n", e->bt_strings[i]);
+ }
+#endif
+}
+
+
+/* default __ex_terminate callback function */
+void __xbt_ex_terminate_default(xbt_ex_t *e)  {
+  xbt_ex_display(e);
 
-  free (strings);
   abort();
 }
 
@@ -70,8 +83,22 @@ ex_ctx_cb_t  __xbt_ex_ctx       = &__xbt_ex_ctx_default;
 ex_term_cb_t __xbt_ex_terminate = &__xbt_ex_terminate_default;
 
 void xbt_ex_free(xbt_ex_t e) {
-  free(e.msg);
+  int i;
+
+  if (e.msg) free(e.msg);
   free(e.procname);
+  if (e.host) {
+    free(e.file);
+    free(e.func);
+    for (i=0; i<e.used; i++) 
+      free(e.bt_strings[i]);
+    free(e.bt_strings);
+    e.bt_strings=NULL;
+  }
+  /* locally, only one chunk of memory is allocated by the libc */
+  if (e.bt_strings)
+    free(e.bt_strings);
+
 }
 
 /** \brief returns a short name for the given exception category */
@@ -88,3 +115,188 @@ const char * xbt_ex_catname(xbt_errcat_t cat) {
   default:              return "INVALID_ERR";
   }
 }
+
+#ifndef HAVE_EXECINFO_H
+/* dummy implementation. We won't use the result, but ex.h needs it to be defined */
+int backtrace (void **__array, int __size) {
+  return 0;
+}
+
+#endif
+
+#ifdef SIMGRID_TEST
+#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 (!= 1)", n);
+            n++;
+            RETHROW;
+        }
+        xbt_test_fail1("MX: n=%d (shouldn't reach this point)", n);
+    }
+    CATCH(ex) {
+        if (n != 4)
+            xbt_test_fail1("M4: n=%d (!= 4)", n);
+        n++;
+        xbt_ex_free(ex);
+    }
+    if (n != 5)
+        xbt_test_fail1("M5: n=%d (!= 5)", 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");
+    } 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");
+  } 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
+
+static void good_example(void) {
+  struct {char*first;} *globalcontext;
+  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);
+      globalcontext->first = cp1;
+      cp1 = NULL /*05 give away*/;
+      cp2 = mallocex(TOOBIG);
+      cp3 = mallocex(SMALLAMOUNT);
+      strcpy(cp1, "foo");
+      strcpy(cp2, "bar");
+    } 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 */