re PR debug/45088 (pointer type information lost in debuginfo)

Fix for PR debug/45088

gcc/

	* dwarf2out.c (gen_type_die_with_usage): Do not try to emit debug
	info for a redundant typedef that has DECL_ORIGINAL_TYPE set. Use
	that underlying type instead.

gcc/testsuite/

	* g++.dg/debug/dwarf2/self-ref-1.C: New test.
	* g++.dg/debug/dwarf2/self-ref-2.C: Likewise.

From-SVN: r167976

gcc/ChangeLog

+2010-12-17  Dodji Seketeli  <dodji@redhat.com>
+
+	* dwarf2out.c (gen_type_die_with_usage): Do not try to emit debug
+    	info for a redundant typedef that has DECL_ORIGINAL_TYPE set. Use
+    	that underlying type instead.
+
 2010-12-16  Jan Hubicka  <jh@suse.cz>
 
 	PR middle-end/44563 

gcc/dwarf2out.c

@@ -20251,13 +20251,23 @@ gen_tagged_type_die (tree type,
 
 static void
 gen_type_die_with_usage (tree type, dw_die_ref context_die,
-				enum debug_info_usage usage)
+			 enum debug_info_usage usage)
 {
   struct array_descr_info info;
 
   if (type == NULL_TREE || type == error_mark_node)
     return;
 
+  if (TYPE_NAME (type) != NULL_TREE
+      && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
+      && is_redundant_typedef (TYPE_NAME (type))
+      && DECL_ORIGINAL_TYPE (TYPE_NAME (type)))
+    /* The DECL of this type is a typedef we don't want to emit debug
+       info for but we want debug info for its underlying typedef.
+       This can happen for e.g, the injected-class-name of a C++
+       type.  */
+    type = DECL_ORIGINAL_TYPE (TYPE_NAME (type));
+
   /* If TYPE is a typedef type variant, let's generate debug info
      for the parent typedef which TYPE is a type of.  */
   if (typedef_variant_p (type))

gcc/testsuite/ChangeLog

+2010-12-17  Dodji Seketeli  <dodji@redhat.com>
+
+	* g++.dg/debug/dwarf2/self-ref-1.C: New test.
+	* g++.dg/debug/dwarf2/self-ref-2.C: Likewise.
+
 2010-12-16  Sebastian Pop  <sebastian.pop@amd.com>
 
 	PR tree-optimization/46924

gcc/testsuite/g++.dg/debug/dwarf2/self-ref-1.C

+// Origin: PR debug/45088
+// { dg-do compile }
+// { dg-options "-g -dA" }
+// { dg-final { scan-assembler-times "\[^\n\r\]*\\(DIE\[^\n\r\]*DW_TAG_pointer_type\\)\[\n\r\]{1,2}\[^\n\r\]*DW_AT_byte_size\[\n\r\]{1,2}\[^\n\r\]*DW_AT_type" 4 } }
+
+struct A
+{
+    virtual ~A();
+};
+
+struct B : public A
+{
+    virtual ~B(){}
+};
+
+struct C : public B
+{
+    A* a1;
+};
+
+int
+main()
+{
+    C c;
+    c.a1 = 0;
+    return 0;
+}
+

gcc/testsuite/g++.dg/debug/dwarf2/self-ref-2.C

+// Origin: PR debug/45088
+// { dg-do compile }
+// { dg-options "-g -dA" }
+// { dg-final { scan-assembler-times "\[^\n\r\]*\\(DIE\[^\n\r\]*DW_TAG_pointer_type\\)\[\n\r\]{1,2}\[^\n\r\]*DW_AT_byte_size\[\n\r\]{1,2}\[^\n\r\]*DW_AT_type" 4 } }
+
+template<class T>
+struct A
+{
+    virtual ~A();
+};
+
+struct B : public A<int>
+{
+    virtual ~B(){}
+};
+
+struct C : public B
+{
+    A<int>* a1;
+};
+
+int
+main()
+{
+    C c;
+    c.a1 = 0;
+    return 0;
+}
+