X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/f3ef4ce507d9aa7d12da1d22373bf0bd052eb543..e40d8a3c090b9106352693e52ea61e63ecbbe93d:/src/xbt/ex.c

diff --git a/src/xbt/ex.c b/src/xbt/ex.c
index af1e4a6838..b92e0c1caa 100644
--- a/src/xbt/ex.c
+++ b/src/xbt/ex.c
@@ -31,9 +31,13 @@
 
 #include <stdio.h>
 #include <stdlib.h>
-#include <execinfo.h>
 
+#include "portable.h" /* execinfo when available */
 #include "xbt/ex.h"
+#include "xbt/module.h" /* xbt_binary_name */
+#include "xbt/ex_interface.h"
+
+#include "gras/Virtu/virtu_interface.h" /* gras_os_myname */
 
 /* default __ex_ctx callback function */
 ex_ctx_t *__xbt_ex_ctx_default(void) {
@@ -42,26 +46,193 @@ 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 show the backtrace of the current point (lovely while debuging) */
+void xbt_backtrace_display(void) {
+#if defined(HAVE_EXECINFO_H) && defined(HAVE_POPEN) && defined(ADDR2LINE)
+  xbt_ex_t e;
+  int i;
+
+  e.used     = backtrace((void**)e.bt,XBT_BACKTRACE_SIZE);
+  e.bt_strings = NULL;
+  xbt_ex_setup_backtrace(&e);
+  for (i=1; i<e.used; i++) /* no need to display "xbt_display_backtrace" */
+    fprintf(stderr,"%s\n",e.bt_strings[i]);
+
+  e.msg=NULL;
+  e.remote=0;
+  xbt_ex_free(e);
+#else 
+  fprintf(stderr,"No backtrace on this arch");
+#endif
+}
+
+void xbt_ex_setup_backtrace(xbt_ex_t *e)  {
+#if defined(HAVE_EXECINFO_H) && defined(HAVE_POPEN) && defined(ADDR2LINE)
+  int i;
+  /* to get the backtrace from the libc */
+  char **backtrace = backtrace_symbols (e->bt, e->used);
+  
+  /* To build the commandline of addr2line */
+  char *cmd = xbt_new(char,strlen(ADDR2LINE)+strlen(xbt_binary_name)+20*e->used);
+  char *curr=cmd;
+  
+  /* to extract the addresses from the backtrace */
+  char **addrs=xbt_new(char*,e->used);
+  char buff[256],*p;
+  
+  /* To read the output of addr2line */
+  FILE *pipe;
+  char line_func[1024],line_pos[1024];
+
+  /* size (in char) of pointers on this arch */
+  int addr_len=0;
+  
+  /* build the commandline */
+  curr += sprintf(curr,"%s -f -e %s ",ADDR2LINE,xbt_binary_name);
+  for (i=0; i<e->used;i++) {
+    /* retrieve this address */
+    snprintf(buff,256,"%s",strchr(backtrace[i],'[')+1);
+    p=strchr(buff,']');
+    *p='\0';
+    addrs[i]=bprintf("%s",buff);
+    
+    /* Add it to the command line args */
+    curr+=sprintf(curr,"%s ",addrs[i]);
+  }	 
+  addr_len = strlen(addrs[0]);
+
+  /* parse the output and build a new backtrace */
+  e->bt_strings = xbt_new(char*,e->used);
+  
+  pipe = popen(cmd, "r");
+  //     xbt_assert(pipe);//,"Cannot fork addr2line to display the backtrace");
+  for (i=0; i<e->used; i++) {
+    fgets(line_func,1024,pipe);
+    line_func[strlen(line_func)-1]='\0';
+    fgets(line_pos,1024,pipe);
+    line_pos[strlen(line_pos)-1]='\0';
+
+    if (strcmp("??",line_func)) {
+      e->bt_strings[i] = bprintf("**   At %s: %s (%s)", 
+				 addrs[i], line_func,line_pos);
+    } else {
+      /* Damn. The symbol is in a dynamic library. Let's get wild */
+      char *maps_name;
+      FILE *maps;
+      char maps_buff[512];
+
+      long int addr,offset,offset_save;
+      char *p,*p2;
+
+      char *subcmd;
+      FILE *subpipe;
+      int found=0;
+
+      /* let's look for the offset of this library in our addressing space */
+      maps_name=bprintf("/proc/%d/maps",(int)getpid());
+      maps=fopen(maps_name,"r");
+
+      addr=strtol(addrs[i]+2, NULL,16);
+
+      while (!found) {
+	if (fgets(maps_buff,512,maps) == NULL) 
+	  break;
+	offset_save = offset;
+	offset=strtol(maps_buff,NULL,16);
+	if (offset > addr)
+	  found=1;
+      }
+
+      fclose(maps);
+      free(maps_name);
+
+      /* Ok, the maps line we just read is beyond the searched symbol. Got it,
+	 the symbol is in previous map, which offset is in offset_save.
+	 We now need to substract this from the address we got from backtrace.
+      */
+      offset=offset_save;
+      
+      free(addrs[i]);
+      addrs[i] = bprintf("0x%0*lx",addr_len-2,addr-offset);
+
+      /* Got it. We have our new address. Let's get the library path and we 
+	 are set */ 
+      p  = xbt_strdup(backtrace[i]);
+      p2 = strrchr(p,'(');
+      if (p2) *p2= '\0';
+      p2 = strrchr(p,' ');
+      if (p2) *p2= '\0';
+      
+      /* Here we go, fire an addr2line up */
+      subcmd = bprintf("%s -f -e %s %s",ADDR2LINE,p, addrs[i]);
+      free(p);
+      subpipe = popen(subcmd,"r");
+      fgets(line_func,1024,subpipe);
+      line_func[strlen(line_func)-1]='\0';
+      fgets(line_pos,1024,subpipe);
+      line_pos[strlen(line_pos)-1]='\0';
+      pclose(subpipe);
+      free(subcmd);
+
+      /* check whether the trick worked */
+      if (strcmp("??",line_func)) {
+	e->bt_strings[i] = bprintf("**   At %s: %s (%s)", 
+				   addrs[i], line_func,line_pos);
+      } else {
+	/* damn, nothing to do here. Let's print the raw address */
+	p  = bprintf("%s",backtrace[i]);
+	p2 = strrchr(p,' ');
+	*p2= '\0';
+	e->bt_strings[i] = bprintf("**   At %s: ?? (%s)", addrs[i], p);
+	free(p);
+      }
+    }
+    free(addrs[i]);
+  }
+  pclose(pipe);
+  free(addrs);
+  free(backtrace);
+  free(cmd);
+#endif
+}    
+
+/** @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",
+	  "** Thrown by %s%s%s",
+	  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:""));
+
+  if (!e->remote && !e->bt_strings)
+    xbt_ex_setup_backtrace(e);
+
+#if defined(HAVE_EXECINFO_H) && defined(HAVE_POPEN) && defined(ADDR2LINE)
+  /* We have everything to build neat backtraces */
+  {
+    int i;
+    
+    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
+  xbt_ex_free(*e);
+}
 
-  fprintf(stderr,"** Backtrace:\n");
-  strings = backtrace_symbols (e->bt, e->used);
 
-  for (i = 0; i < e->used; i++)
-     printf ("   %s\n", strings[i]);
+/* default __ex_terminate callback function */
+void __xbt_ex_terminate_default(xbt_ex_t *e)  {
+  xbt_ex_display(e);
 
-  free (strings);
   abort();
 }
 
@@ -70,8 +241,22 @@ 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);
-  free(e.procname);
+  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 */
@@ -88,3 +273,201 @@ 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 (!= 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");
+    } 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 */