re PR c++/13242 ([ABI] Incorrect mangling of template reference parameters)

cp:
	PR c++/13242
	C++ ABI change. Mangling template parameters of reference type
	* mangle.c (write_template_args): Remove unreachable code.
	(write_template_arg): Look through an argument of reference type.
testsuite:
	PR c++/13242
	* g++.dg/abi/mangle19-1.C: New test.
	* g++.dg/abi/mangle19-2.C: New test.

From-SVN: r74682

1 files changed, 26 insertions, 24 deletions

diff --git a/gcc/cp/mangle.c b/gcc/cp/mangle.c
index a20757e..fe01120 100644
--- a/gcc/cp/mangle.c
+++ b/gcc/cp/mangle.c
@@ -1845,37 +1845,25 @@ write_class_enum_type (const tree type)
 static void
 write_template_args (tree args)
 {
+  int i;
+  int length = TREE_VEC_LENGTH (args);
+  
   MANGLE_TRACE_TREE ("template-args", args);
 
   write_char ('I');
 
-  if (TREE_CODE (args) == TREE_VEC)
-    {
-      int i;
-      int length = TREE_VEC_LENGTH (args);
-      my_friendly_assert (length > 0, 20000422);
+  my_friendly_assert (length > 0, 20000422);
 
-      if (TREE_CODE (TREE_VEC_ELT (args, 0)) == TREE_VEC)
-	{
-	  /* We have nested template args.  We want the innermost template
-	     argument list.  */
-	  args = TREE_VEC_ELT (args, length - 1);
-	  length = TREE_VEC_LENGTH (args);
-	}
-      for (i = 0; i < length; ++i)
-	write_template_arg (TREE_VEC_ELT (args, i));
-    }
-  else 
+  if (TREE_CODE (TREE_VEC_ELT (args, 0)) == TREE_VEC)
     {
-      my_friendly_assert (TREE_CODE (args) == TREE_LIST, 20021014);
-
-      while (args)
-	{
-	  write_template_arg (TREE_VALUE (args));
-	  args = TREE_CHAIN (args);
-	}
+      /* We have nested template args.  We want the innermost template
+	 argument list.  */
+      args = TREE_VEC_ELT (args, length - 1);
+      length = TREE_VEC_LENGTH (args);
     }
-
+  for (i = 0; i < length; ++i)
+    write_template_arg (TREE_VEC_ELT (args, i));
+  
   write_char ('E');
 }
 
@@ -2165,6 +2153,20 @@ write_template_arg (tree node)
 	  code = TREE_CODE (node);
 	}
     }
+  
+  if (TREE_CODE (node) == NOP_EXPR
+      && TREE_CODE (TREE_TYPE (node)) == REFERENCE_TYPE)
+    {
+      /* Template parameters can be of reference type. To maintain
+	 internal consistency, such arguments use a conversion from
+	 address of object to reference type.  */
+      my_friendly_assert (TREE_CODE (TREE_OPERAND (node, 0)) == ADDR_EXPR,
+			  20031215);
+      if (abi_version_at_least (2))
+	node = TREE_OPERAND (TREE_OPERAND (node, 0), 0);
+      else
+	G.need_abi_warning = 1;
+    }
 
   if (TYPE_P (node))
     write_type (node);