re PR c++/39095 (Mangling changes break ABI)

	PR c++/39095
	* operators.def: Use COMPONENT_REF code for ->/pt operator again,
	remove ./dt operator.
	* mangle.c (write_expression): Handle COMPONENT_REF after handling
	ADDR_EXPR, for COMPONENT_REF without ARROW_EXPR inside of it
	write_string ("dt") instead of using operators.def.

	* g++.dg/abi/mangle31.C: New test.

From-SVN: r143933

gcc/cp/ChangeLog

+2009-02-04  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/39095
+	* operators.def: Use COMPONENT_REF code for ->/pt operator again,
+	remove ./dt operator.
+	* mangle.c (write_expression): Handle COMPONENT_REF after handling
+	ADDR_EXPR, for COMPONENT_REF without ARROW_EXPR inside of it
+	write_string ("dt") instead of using operators.def.
+
 2009-02-03  Jason Merrill  <jason@redhat.com>
 
 	* typeck.c (cp_build_unary_op): Only complain about taking address

gcc/cp/mangle.c

@@ -2298,20 +2298,6 @@ write_expression (tree expr)
 	    write_template_args (template_args);
 	}
     }
-  else if (code == COMPONENT_REF)
-    {
-      tree ob = TREE_OPERAND (expr, 0);
-
-      if (TREE_CODE (ob) == ARROW_EXPR)
-	{
-	  code = ARROW_EXPR;
-	  ob = TREE_OPERAND (ob, 0);
-	}
-
-      write_string (operator_name_info[(int)code].mangled_name);
-      write_expression (ob);
-      write_member_name (TREE_OPERAND (expr, 1));
-    }
   else
     {
       int i;
@@ -2334,6 +2320,23 @@ write_expression (tree expr)
 	  code = TREE_CODE (expr);
 	}
 
+      if (code == COMPONENT_REF)
+	{
+	  tree ob = TREE_OPERAND (expr, 0);
+
+	  if (TREE_CODE (ob) == ARROW_EXPR)
+	    {
+	      write_string (operator_name_info[(int)code].mangled_name);
+	      ob = TREE_OPERAND (ob, 0);
+	    }
+	  else
+	    write_string ("dt");
+
+	  write_expression (ob);
+	  write_member_name (TREE_OPERAND (expr, 1));
+	  return;
+	}
+
       /* If it wasn't any of those, recursively expand the expression.  */
       write_string (operator_name_info[(int) code].mangled_name);
 

gcc/cp/operators.def

@@ -125,8 +125,7 @@ DEF_SIMPLE_OPERATOR ("&&", TRUTH_ANDIF_EXPR, "aa", 2)
 DEF_SIMPLE_OPERATOR ("||", TRUTH_ORIF_EXPR, "oo", 2)
 DEF_SIMPLE_OPERATOR (",", COMPOUND_EXPR, "cm", 2)
 DEF_SIMPLE_OPERATOR ("->*", MEMBER_REF, "pm", 2)
-DEF_SIMPLE_OPERATOR ("->", ARROW_EXPR, "pt", 2)
-DEF_SIMPLE_OPERATOR (".", COMPONENT_REF, "dt", 2)
+DEF_SIMPLE_OPERATOR ("->", COMPONENT_REF, "pt", 2)
 DEF_SIMPLE_OPERATOR ("[]", ARRAY_REF, "ix", 2)
 DEF_SIMPLE_OPERATOR ("++", POSTINCREMENT_EXPR, "pp", 2)
 DEF_SIMPLE_OPERATOR ("--", POSTDECREMENT_EXPR, "mm", 2)

gcc/testsuite/ChangeLog

+2009-02-04  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/39095
+	* g++.dg/abi/mangle31.C: New test.
+
 2009-02-03  Joseph Myers  <joseph@codesourcery.com>
 
 	PR c/29129

gcc/testsuite/g++.dg/abi/mangle31.C

+// PR c++/39095
+// { dg-do compile }
+
+struct B
+{
+  int b;
+};
+
+struct A
+{
+  B *operator->();
+  A ();
+  B b;
+};
+
+A::A ()
+{
+}
+
+B *
+A::operator->()
+{
+  return &b;
+}
+
+A a;
+
+int
+foo ()
+{
+  return a->b;
+}
+
+// { dg-final { scan-assembler "_ZN1AptEv" } }
+// { dg-final { scan-assembler-not "_ZN1AdtEv" } }