c++: coerce_template_template_parms interface tweak

This should have no semantic effect, but is a prerequisite for the PR108179
fix to follow.

	PR c++/108179

gcc/cp/ChangeLog:

	* pt.cc	(coerce_template_template_parms): Take the arg and parm
	templates directly.
	(coerce_template_template_parm): Adjust.
	(template_template_parm_bindings_ok_p): Adjust.
	(convert_template_argument): Adjust.

diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc
index 84021c2..d75c439 100644 (file)
--- a/gcc/cp/pt.cc
+++ b/gcc/cp/pt.cc
@@ -7798,11 +7798,8 @@ coerce_template_template_parm (tree parm,
         template <template <template <class> class> class TT>
         class C;  */
       {
-       tree parmparm = DECL_TEMPLATE_PARMS (parm);
-       tree argparm = DECL_TEMPLATE_PARMS (arg);
-
        if (!coerce_template_template_parms
-           (parmparm, argparm, complain, in_decl, outer_args))
+           (parm, arg, complain, in_decl, outer_args))
          return 0;
       }
       /* Fall through.  */
@@ -8050,21 +8047,19 @@ unify_bound_ttp_args (tree tparms, tree targs, tree parm, tree& arg,
   return 0;
 }
 
-/* Return 1 if PARM_PARMS and ARG_PARMS matches using rule for
-   template template parameters.  Both PARM_PARMS and ARG_PARMS are
-   vectors of TREE_LIST nodes containing TYPE_DECL, TEMPLATE_DECL
-   or PARM_DECL.
+/* Return 1 if PARM_TMPL and ARG_TMPL match using rule for
+   template template parameters.
 
    Consider the example:
      template <class T> class A;
      template<template <class U> class TT> class B;
 
-   For B<A>, PARM_PARMS are the parameters to TT, while ARG_PARMS are
-   the parameters to A, and OUTER_ARGS contains A.  */
+   For B<A>, PARM_TMPL is TT, while ARG_TMPL is A,
+   and OUTER_ARGS contains A.  */
 
 static int
-coerce_template_template_parms (tree parm_parms_full,
-                               tree arg_parms_full,
+coerce_template_template_parms (tree parm_tmpl,
+                               tree arg_tmpl,
                                tsubst_flags_t complain,
                                tree in_decl,
                                tree outer_args)
@@ -8073,7 +8068,8 @@ coerce_template_template_parms (tree parm_parms_full,
   tree parm, arg;
   int variadic_p = 0;
 
-  tree parm_parms = INNERMOST_TEMPLATE_PARMS (parm_parms_full);
+  tree parm_parms = INNERMOST_TEMPLATE_PARMS (DECL_TEMPLATE_PARMS (parm_tmpl));
+  tree arg_parms_full = DECL_TEMPLATE_PARMS (arg_tmpl);
   tree arg_parms = INNERMOST_TEMPLATE_PARMS (arg_parms_full);
 
   gcc_assert (TREE_CODE (parm_parms) == TREE_VEC);
@@ -8254,8 +8250,6 @@ template_template_parm_bindings_ok_p (tree tparms, tree targs)
 
          for (idx = 0; idx < len; ++idx)
            {
-             tree targ_parms = NULL_TREE;
-
              if (packed_args)
                /* Extract the next argument from the argument
                   pack.  */
@@ -8267,18 +8261,16 @@ template_template_parm_bindings_ok_p (tree tparms, tree targs)
 
              /* Extract the template parameters from the template
                 argument.  */
-             if (TREE_CODE (targ) == TEMPLATE_DECL)
-               targ_parms = DECL_TEMPLATE_PARMS (targ);
-             else if (TREE_CODE (targ) == TEMPLATE_TEMPLATE_PARM)
-               targ_parms = DECL_TEMPLATE_PARMS (TYPE_NAME (targ));
+             if (TREE_CODE (targ) == TEMPLATE_TEMPLATE_PARM)
+               targ = TYPE_NAME (targ);
 
              /* Verify that we can coerce the template template
                 parameters from the template argument to the template
                 parameter.  This requires an exact match.  */
-             if (targ_parms
+             if (TREE_CODE (targ) == TEMPLATE_DECL
                  && !coerce_template_template_parms
-                      (DECL_TEMPLATE_PARMS (tparm),
-                       targ_parms,
+                      (tparm,
+                       targ,
                        tf_none,
                        tparm,
                        targs))
@@ -8571,15 +8563,11 @@ convert_template_argument (tree parm,
            val = orig_arg;
          else
            {
-             tree parmparm = DECL_TEMPLATE_PARMS (parm);
-             tree argparm;
-
              /* Strip alias templates that are equivalent to another
                 template.  */
              arg = get_underlying_template (arg);
-             argparm = DECL_TEMPLATE_PARMS (arg);
 
-             if (coerce_template_template_parms (parmparm, argparm,
+             if (coerce_template_template_parms (parm, arg,
                                                  complain, in_decl,
                                                  args))
                {