re PR c++/50614 ([C++0x] ICE: tree check: expected field_decl, have identifier_node in component_ref_field_offset, at expr.c:6697 with -fcompare-debug and a non-static initializer)

PR c++/50614
	* cp-tree.h (VAR_TEMPL_TYPE_FIELD_OR_FUNCTION_DECL_CHECK): New.
	(DECL_TEMPLATE_INFO): Use it.
	* pt.c (tsubst_decl) [FIELD_DECL]: Set DECL_TEMPLATE_INFO
	if the decl has an NSDMI.
	* init.c (perform_member_init): Use it.

From-SVN: r179945

gcc/cp/ChangeLog

@@ -1,5 +1,12 @@
 2011-10-13  Jason Merrill  <jason@redhat.com>
 
+	PR c++/50614
+	* cp-tree.h (VAR_TEMPL_TYPE_FIELD_OR_FUNCTION_DECL_CHECK): New.
+	(DECL_TEMPLATE_INFO): Use it.
+	* pt.c (tsubst_decl) [FIELD_DECL]: Set DECL_TEMPLATE_INFO
+	if the decl has an NSDMI.
+	* init.c (perform_member_init): Use it.
+
 	PR c++/50437
 	* cp-tree.h (struct tree_lambda_expr): Add closure field.
 	(LAMBDA_EXPR_CLOSURE): New.

gcc/cp/cp-tree.h

@@ -201,6 +201,9 @@ c-common.h, not after.
 #define VAR_TEMPL_TYPE_OR_FUNCTION_DECL_CHECK(NODE) \
   TREE_CHECK4(NODE,VAR_DECL,FUNCTION_DECL,TYPE_DECL,TEMPLATE_DECL)
 
+#define VAR_TEMPL_TYPE_FIELD_OR_FUNCTION_DECL_CHECK(NODE) \
+  TREE_CHECK5(NODE,VAR_DECL,FIELD_DECL,FUNCTION_DECL,TYPE_DECL,TEMPLATE_DECL)
+
 #define BOUND_TEMPLATE_TEMPLATE_PARM_TYPE_CHECK(NODE) \
   TREE_CHECK(NODE,BOUND_TEMPLATE_TEMPLATE_PARM)
 
@@ -2556,7 +2559,7 @@ extern void decl_shadowed_for_var_insert (tree, tree);
    global function f.  In this case, DECL_TEMPLATE_INFO for S<int>::f
    will be non-NULL, but DECL_USE_TEMPLATE will be zero.  */
 #define DECL_TEMPLATE_INFO(NODE) \
-  (DECL_LANG_SPECIFIC (VAR_TEMPL_TYPE_OR_FUNCTION_DECL_CHECK (NODE)) \
+  (DECL_LANG_SPECIFIC (VAR_TEMPL_TYPE_FIELD_OR_FUNCTION_DECL_CHECK (NODE)) \
    ->u.min.template_info)
 
 /* For a VAR_DECL, indicates that the variable is actually a
@@ -2701,7 +2704,10 @@ extern void decl_shadowed_for_var_insert (tree, tree);
      template <class T> struct S { friend void f<int>(int, double); }
 
    the DECL_TI_TEMPLATE will be an IDENTIFIER_NODE for `f' and the
-   DECL_TI_ARGS will be {int}.  */
+   DECL_TI_ARGS will be {int}.
+
+   For a FIELD_DECL with a non-static data member initializer, this value
+   is the FIELD_DECL it was instantiated from.  */
 #define DECL_TI_TEMPLATE(NODE)      TI_TEMPLATE (DECL_TEMPLATE_INFO (NODE))
 
 /* The template arguments used to obtain this decl from the most

gcc/cp/init.c

@@ -497,11 +497,11 @@ perform_member_init (tree member, tree init)
      mem-initializer for this field.  */
   if (init == NULL_TREE)
     {
-      if (CLASSTYPE_TEMPLATE_INSTANTIATION (DECL_CONTEXT (member)))
+      if (DECL_LANG_SPECIFIC (member) && DECL_TEMPLATE_INFO (member))
 	/* Do deferred instantiation of the NSDMI.  */
 	init = (tsubst_copy_and_build
-		(DECL_INITIAL (member),
-		 CLASSTYPE_TI_ARGS (DECL_CONTEXT (member)),
+		(DECL_INITIAL (DECL_TI_TEMPLATE (member)),
+		 DECL_TI_ARGS (member),
 		 tf_warning_or_error, member, /*function_p=*/false,
 		 /*integral_constant_expression_p=*/false));
       else

gcc/cp/pt.c

@@ -10269,6 +10269,16 @@ tsubst_decl (tree t, tree args, tsubst_flags_t complain)
 	    = tsubst_expr (DECL_INITIAL (t), args,
 			   complain, in_decl,
 			   /*integral_constant_expression_p=*/true);
+	else if (DECL_INITIAL (t))
+	  {
+	    /* Set up DECL_TEMPLATE_INFO so that we can get at the
+	       NSDMI in perform_member_init.  Still set DECL_INITIAL
+	       to error_mark_node so that we know there is one.  */
+	    DECL_INITIAL (r) = error_mark_node;
+	    gcc_assert (DECL_LANG_SPECIFIC (r) == NULL);
+	    retrofit_lang_decl (r);
+	    DECL_TEMPLATE_INFO (r) = build_template_info (t, args);
+	  }
 	/* We don't have to set DECL_CONTEXT here; it is set by
 	   finish_member_declaration.  */
 	DECL_CHAIN (r) = NULL_TREE;

gcc/testsuite/ChangeLog

@@ -1,5 +1,8 @@
 2011-10-13  Jason Merrill  <jason@redhat.com>
 
+	PR c++/50614
+	* g++.dg/cpp0x/nsdmi-template2.C: New.
+
 	PR c++/50437
 	* g++.dg/cpp0x/lambda/lambda-auto1.C: New.
 

gcc/testsuite/g++.dg/cpp0x/nsdmi-template2.C

@@ -0,0 +1,14 @@
+// PR c++/50614
+// { dg-options "-std=c++0x -fcompare-debug" }
+
+struct A
+{
+  int f ();
+};
+
+template <int> struct B : A
+{
+  int i = this->f ();
+};
+
+B<0> b;