* common.opt (flag_stack_usage_info): New variable.

[pf3gnuchains/gcc-fork.git] / gcc / toplev.c

diff --git a/gcc/toplev.c b/gcc/toplev.c
index d002427..6c992cf 100644 (file)
--- a/gcc/toplev.c
+++ b/gcc/toplev.c
@@ -1048,14 +1048,12 @@ output_stack_usage (void)
   };
   HOST_WIDE_INT stack_usage = current_function_static_stack_size;
   enum stack_usage_kind_type stack_usage_kind;
-  expanded_location loc;
-  const char *raw_id, *id;
 
   if (stack_usage < 0)
     {
       if (!warning_issued)
        {
-         warning (0, "-fstack-usage not supported for this target");
+         warning (0, "stack usage computation not supported for this target");
          warning_issued = true;
        }
       return;
@@ -1082,24 +1080,44 @@ output_stack_usage (void)
       stack_usage += current_function_dynamic_stack_size;
     }
 
-  loc = expand_location (DECL_SOURCE_LOCATION (current_function_decl));
+  if (flag_stack_usage)
+    {
+      expanded_location loc
+       = expand_location (DECL_SOURCE_LOCATION (current_function_decl));
+      const char *raw_id, *id;
+
+      /* Strip the scope prefix if any.  */
+      raw_id = lang_hooks.decl_printable_name (current_function_decl, 2);
+      id = strrchr (raw_id, '.');
+      if (id)
+       id++;
+      else
+       id = raw_id;
+
+      fprintf (stack_usage_file,
+              "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC"\t%s\n",
+              lbasename (loc.file),
+              loc.line,
+              loc.column,
+              id,
+              stack_usage,
+              stack_usage_kind_str[stack_usage_kind]);
+    }
 
-  /* Strip the scope prefix if any.  */
-  raw_id = lang_hooks.decl_printable_name (current_function_decl, 2);
-  id = strrchr (raw_id, '.');
-  if (id)
-    id++;
-  else
-    id = raw_id;
-
-  fprintf (stack_usage_file,
-          "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC"\t%s\n",
-          lbasename (loc.file),
-          loc.line,
-          loc.column,
-          id,
-          stack_usage,
-          stack_usage_kind_str[stack_usage_kind]);
+  if (warn_stack_usage >= 0)
+    {
+      if (stack_usage_kind == DYNAMIC)
+       warning (OPT_Wstack_usage_, "stack usage might be unbounded");
+      else if (stack_usage > warn_stack_usage)
+       {
+         if (stack_usage_kind == DYNAMIC_BOUNDED)
+           warning (OPT_Wstack_usage_, "stack usage might be %wd bytes",
+                    stack_usage);
+         else
+           warning (OPT_Wstack_usage_, "stack usage is %wd bytes",
+                    stack_usage);
+       }
+    }
 }
 
 /* Open an auxiliary output file.  */