Implement LD_DEBUG=scopes

4 files changed, 59 insertions, 38 deletions

diff --git a/ChangeLog b/ChangeLog
index 8d2f204dcf..6d543f6263 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,13 @@
 2011-08-13  Ulrich Drepper  <drepper@gmail.com>
 
+	* elf/dl-open.c: Rename show_scope to _dl_schow_scope and export.
+	(dl_open_worker): Call _dl_show_scope when DL_DEBUG_SCOPES is set.
+	* elf/rtld.c (dl_main): Set l_name of vDSO.
+	Call _dl_show_scope when DL_DEBUG_SCOPES.
+	(process_dl_debug): Recognize scopes flag and also set it for all.
+	* sysdeps/generic/ldsodefs.h: Define DL_DEBUG_SCOPES.
+	Declare _dl_show_scope.
+
 	* elf/dl-libc.c (do_dlopen_args): Add caller_dlopen.
 	(do_dlopen): Pass caller_dlopen to dl_open.
 	(__libc_dlopen_mode): Initialize caller_dlopen.
diff --git a/elf/dl-open.c b/elf/dl-open.c
index 19fda917f3..c3e5fbaea7 100644
--- a/elf/dl-open.c
+++ b/elf/dl-open.c
@@ -46,12 +46,6 @@ weak_extern (BP_SYM (_dl_sysdep_start))
 
 extern int __libc_multiple_libcs;	/* Defined in init-first.c.  */
 
-/* Undefine the following for debugging.  */
-/* #define SCOPE_DEBUG 1 */
-#ifdef SCOPE_DEBUG
-static void show_scope (struct link_map *new);
-#endif
-
 /* We must be carefull not to leave us in an inconsistent state.  Thus we
    catch any error and re-raise it after cleaning up.  */
 
@@ -269,10 +263,6 @@ dl_open_worker (void *a)
       (void) _dl_check_map_versions (new->l_searchlist.r_list[i]->l_real,
 				     0, 0);
 
-#ifdef SCOPE_DEBUG
-  show_scope (new);
-#endif
-
 #ifdef SHARED
   /* Auditing checkpoint: we have added all objects.  */
   if (__builtin_expect (GLRO(dl_naudit) > 0, 0))
@@ -414,6 +404,10 @@ dl_open_worker (void *a)
 	  imap->l_scope[cnt + 1] = NULL;
 	  atomic_write_barrier ();
 	  imap->l_scope[cnt] = &new->l_searchlist;
+
+	  /* Print scope information.  */
+	  if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_SCOPES, 0))
+	    _dl_show_scope (imap);
 	}
       /* Only add TLS memory if this object is loaded now and
 	 therefore is not yet initialized.  */
@@ -499,6 +493,10 @@ cannot load any more object with static TLS"));
   if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_FILES, 0))
     _dl_debug_printf ("opening file=%s [%lu]; direct_opencount=%u\n\n",
 		      new->l_name, new->l_ns, new->l_direct_opencount);
+
+  /* Print scope information.  */
+  if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_SCOPES, 0))
+    _dl_show_scope (new);
 }
 
 
@@ -635,33 +633,32 @@ no more namespaces available for dlmopen()"));
 }
 
 
-#ifdef SCOPE_DEBUG
-#include <unistd.h>
-
-static void
-show_scope (struct link_map *new)
+void
+_dl_show_scope (struct link_map *l)
 {
-  int scope_cnt;
-
-  for (scope_cnt = 0; new->l_scope[scope_cnt] != NULL; ++scope_cnt)
-    {
-      char numbuf[2];
-      unsigned int cnt;
-
-      numbuf[0] = '0' + scope_cnt;
-      numbuf[1] = '\0';
-      _dl_printf ("scope %s:", numbuf);
-
-      for (cnt = 0; cnt < new->l_scope[scope_cnt]->r_nlist; ++cnt)
-	if (*new->l_scope[scope_cnt]->r_list[cnt]->l_name)
-	  _dl_printf (" %s", new->l_scope[scope_cnt]->r_list[cnt]->l_name);
-	else
-	  _dl_printf (" <main>");
+  _dl_debug_printf ("object=%s [%lu]\n",
+		    *l->l_name ? l->l_name : rtld_progname, l->l_ns);
+  if (l->l_scope != NULL)
+    for (int scope_cnt = 0; l->l_scope[scope_cnt] != NULL; ++scope_cnt)
+      {
+	char numbuf[2];
+	unsigned int cnt;
+
+	numbuf[0] = '0' + scope_cnt;
+	numbuf[1] = '\0';
+	_dl_debug_printf (" scope %s:", numbuf);
+
+	for (cnt = 0; cnt < l->l_scope[scope_cnt]->r_nlist; ++cnt)
+	  if (*l->l_scope[scope_cnt]->r_list[cnt]->l_name)
+	    _dl_debug_printf_c (" %s",
+				l->l_scope[scope_cnt]->r_list[cnt]->l_name);
+	  else
+	    _dl_debug_printf_c (" %s", rtld_progname);
 
-      _dl_printf ("\n");
-    }
+	_dl_debug_printf_c ("\n");
+      }
+  _dl_debug_printf ("\n");
 }
-#endif
 
 #ifdef IS_IN_rtld
 /* Return non-zero if ADDR lies within one of L's segments.  */
diff --git a/elf/rtld.c b/elf/rtld.c
index 9eb9289ead..b84a3e7a34 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -1391,7 +1391,7 @@ of this helper program; chances are you did not intend to run this program.\n\
 	      char *copy = malloc (len);
 	      if (copy == NULL)
 		_dl_fatal_printf ("out of memory\n");
-	      l->l_libname->name = memcpy (copy, dsoname, len);
+	      l->l_name = l->l_libname->name = memcpy (copy, dsoname, len);
 	    }
 
 	  /* Add the vDSO to the object list.  */
@@ -2191,6 +2191,15 @@ ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n",
      malloc will no longer be the one from dl-minimal.c.  */
   GLRO(dl_init_all_dirs) = GL(dl_all_dirs);
 
+  /* Print scope information.  */
+  if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_SCOPES, 0))
+    {
+      _dl_debug_printf ("\nInitial object scopes\n");
+
+      for (struct link_map *l = main_map; l != NULL; l = l->l_next)
+	_dl_show_scope (l);
+    }
+
   if (prelinked)
     {
       if (main_map->l_info [ADDRIDX (DT_GNU_CONFLICT)] != NULL)
@@ -2431,9 +2440,12 @@ process_dl_debug (const char *dl_debug)
 	DL_DEBUG_BINDINGS | DL_DEBUG_IMPCALLS },
       { LEN_AND_STR ("versions"), "display version dependencies",
 	DL_DEBUG_VERSIONS | DL_DEBUG_IMPCALLS },
+      { LEN_AND_STR ("scopes"), "display scope information",
+	DL_DEBUG_SCOPES },
       { LEN_AND_STR ("all"), "all previous options combined",
 	DL_DEBUG_LIBS | DL_DEBUG_RELOC | DL_DEBUG_FILES | DL_DEBUG_SYMBOLS
-	| DL_DEBUG_BINDINGS | DL_DEBUG_VERSIONS | DL_DEBUG_IMPCALLS },
+	| DL_DEBUG_BINDINGS | DL_DEBUG_VERSIONS | DL_DEBUG_IMPCALLS
+	| DL_DEBUG_SCOPES },
       { LEN_AND_STR ("statistics"), "display relocation statistics",
 	DL_DEBUG_STATISTICS },
       { LEN_AND_STR ("unused"), "determined unused DSOs",
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 26c74f6ce0..a5f0a25ccc 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -556,9 +556,10 @@ struct rtld_global_ro
 #define DL_DEBUG_FILES      (1 << 6)
 #define DL_DEBUG_STATISTICS (1 << 7)
 #define DL_DEBUG_UNUSED	    (1 << 8)
+#define DL_DEBUG_SCOPES	    (1 << 9)
 /* These two are used only internally.  */
-#define DL_DEBUG_HELP       (1 << 9)
-#define DL_DEBUG_PRELINK    (1 << 10)
+#define DL_DEBUG_HELP       (1 << 10)
+#define DL_DEBUG_PRELINK    (1 << 11)
 
   /* OS version.  */
   EXTERN unsigned int _dl_osversion;
@@ -1104,6 +1105,9 @@ extern void *_dl_tls_get_addr_soft (struct link_map *l) attribute_hidden;
 extern int _dl_addr_inside_object (struct link_map *l, const ElfW(Addr) addr)
      internal_function attribute_hidden;
 
+/* Show show of an object.  */
+extern void _dl_show_scope (struct link_map *new);
+
 __END_DECLS
 
 #endif /* ldsodefs.h */