re PR tree-optimization/35006 (Segfault in remove_unused_locals with nested functions)

2008-01-29  Richard Guenther  <rguenther@suse.de>

	PR middle-end/35006
	* tree-inline.h (struct copy_body_data): Add remapping_type_depth
	field.
	* tree-inline.c (remap_type): Increment remapping_type_depth
	around remapping types.
	(copy_body_r): Only add referenced variables if they are referenced
	from code, not types.

	* gcc.c-torture/compile/pr35006.c: New testcase.

From-SVN: r131939

gcc/ChangeLog

@@ -1,3 +1,13 @@
+2008-01-29  Richard Guenther  <rguenther@suse.de>
+
+	PR middle-end/35006
+	* tree-inline.h (struct copy_body_data): Add remapping_type_depth
+	field.
+	* tree-inline.c (remap_type): Increment remapping_type_depth
+	around remapping types.
+	(copy_body_r): Only add referenced variables if they are referenced
+	from code, not types.
+
 2008-01-29  Douglas Gregor  <doug.gregor@gmail.com>
 
 	PR c++/34055

gcc/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2008-01-29  Richard Guenther  <rguenther@suse.de>
+
+	PR middle-end/35006
+	* gcc.c-torture/compile/pr35006.c: New testcase.
+
 2008-01-29  Douglas Gregor  <doug.gregor@gmail.com>
 
 	PR c++/34055

gcc/testsuite/gcc.c-torture/compile/pr35006.c

@@ -0,0 +1,29 @@
+typedef unsigned long grub_uint64_t;
+typedef grub_uint64_t grub_size_t;
+grub_cmdline_get (unsigned max_len, int echo_char)
+{
+  unsigned xpos, ypos, ystart;
+  grub_size_t lpos, llen;
+  char buf[max_len];
+  void cl_print (int pos, int c)
+  {
+      char *p;
+      for (p = buf + pos; *p; p++)
+      {
+        if (xpos++ > 78)
+          grub_putchar ('\n');
+        grub_putchar (*p);
+      }
+ }
+ void cl_delete (unsigned len)
+ {
+   cl_set_pos ();
+   cl_print (lpos, ' ');
+   grub_memmove ();
+   cl_print (lpos, echo_char);
+   cl_set_pos ();
+ }
+ cl_delete (llen);
+ grub_size_t n = lpos;
+ cl_delete (n);
+}

gcc/tree-inline.c

@@ -409,6 +409,7 @@ tree
 remap_type (tree type, copy_body_data *id)
 {
   tree *node;
+  tree tmp;
 
   if (type == NULL)
     return type;
@@ -425,7 +426,11 @@ remap_type (tree type, copy_body_data *id)
       return type;
     }
 
-  return remap_type_1 (type, id);
+  id->remapping_type_depth++;
+  tmp = remap_type_1 (type, id);
+  id->remapping_type_depth--;
+
+  return tmp;
 }
 
 static tree
@@ -723,9 +728,10 @@ copy_body_r (tree *tp, int *walk_subtrees, void *data)
 	 tweak some special cases.  */
       copy_tree_r (tp, walk_subtrees, NULL);
 
-      /* Global variables we didn't seen yet needs to go into referenced
-	 vars.  */
-      if (gimple_in_ssa_p (cfun) && TREE_CODE (*tp) == VAR_DECL)
+      /* Global variables we haven't seen yet needs to go into referenced
+	 vars.  If not referenced from types only.  */
+      if (gimple_in_ssa_p (cfun) && TREE_CODE (*tp) == VAR_DECL
+	  && id->remapping_type_depth == 0)
 	add_referenced_var (*tp);
        
       /* If EXPR has block defined, map it to newly constructed block.

gcc/tree-inline.h

@@ -95,6 +95,9 @@ typedef struct copy_body_data
   /* True if this statement will need to be regimplified.  */
   bool regimplify;
 
+  /* > 0 if we are remapping a type currently.  */
+  int remapping_type_depth;
+
   /* Statements that might be possibly folded.  */
   struct pointer_set_t *statements_to_fold;