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Re: [PATCH 1/2] Use TEMPLATE_ID_TYPE in lieu of BOUND_TEMPLATE_TEMPLATE_PARM
On 12/09/2011 03:26 PM, Dodji Seketeli wrote:
Two overall comments:
1) Yeah, let's hold this for 4.8.
2) TEMPLATE_ID_TYPE in this patch is too closely related to
BOUND_TEMPLATE_TEMPLATE_PARM; I'd like to see all the
BOUND_TEMPLATE_TEMPLATE_PARM_P checks go away so that things know how to
handle TEMPLATE_ID_TYPE and they know how to handle
TEMPLATE_TEMPLATE_PARM, but the combination of the two is not handled
specially.
#define TEMPLATE_TYPE_PARM_INDEX(NODE) \
(TYPE_VALUES_RAW (TREE_CHECK3 ((NODE), TEMPLATE_TYPE_PARM, \
TEMPLATE_TEMPLATE_PARM, \
- BOUND_TEMPLATE_TEMPLATE_PARM)))
+ TEMPLATE_ID_TYPE)))
A TEMPLATE_ID_TYPE shouldn't have a parm index.
/* Brings type template parameters to the canonical forms. */
if (code == TEMPLATE_TYPE_PARM || code == TEMPLATE_TEMPLATE_PARM
- || code == BOUND_TEMPLATE_TEMPLATE_PARM)
+ || BOUND_TEMPLATE_TEMPLATE_PARM_P (parm))
parm = TEMPLATE_TYPE_PARM_INDEX (parm);
Do we still need to handle this case here?
/* Accept bound template template parameters. */
else if (allow_template_p
- && TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
+ && BOUND_TEMPLATE_TEMPLATE_PARM_P (type))
Do we want to allow all TEMPLATE_ID_TYPE here?
/* We can't apply any attributes to a completely unknown type until
instantiation time. */
enum tree_code code = TREE_CODE (type);
- if (code == TEMPLATE_TYPE_PARM
- || code == BOUND_TEMPLATE_TEMPLATE_PARM
+ if (BOUND_TEMPLATE_TEMPLATE_PARM_P (type)
+ ||code == TEMPLATE_TYPE_PARM
|| code == TYPENAME_TYPE)
And here?
/* Create lang_type structure. */
if (RECORD_OR_UNION_CODE_P (code)
- || code == BOUND_TEMPLATE_TEMPLATE_PARM)
+ || code == TEMPLATE_ID_TYPE)
TEMPLATE_ID_TYPE doesn't need the whole 80 bytes of lang_type; it only
needs one more tree outside of type_common. Since currently
tree_code_size treats all types as being type_non_common, let's use
TYPE_VALUES_RAW, TYPE_MINVAL, or TYPE_MAXVAL for TYPE_TEMPLATE_INFO of a
TEMPLATE_ID_TYPE so it doesn't need TYPE_LANG_SPECIFIC at all.
#define CLASSTYPE_TEMPLATE_ID_P(NODE) \
(TYPE_LANG_SPECIFIC (NODE) != NULL \
- && (TREE_CODE (NODE) == BOUND_TEMPLATE_TEMPLATE_PARM \
+ && (BOUND_TEMPLATE_TEMPLATE_PARM_P (NODE) \
|| (CLASSTYPE_TEMPLATE_INFO (NODE) != NULL \
&& (PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (NODE))))))
I think that with alias templates this should be renamed to
TYPE_TEMPLATE_ID_P, and it should support all TEMPLATE_ID_TYPE. And the
first use of CLASSTYPE_TEMPLATE_ID_P should drop the CLASS_TYPE_P check.
/* Handle template parameters. */
if (code == TEMPLATE_TYPE_PARM
|| code == TEMPLATE_TEMPLATE_PARM
- || code == BOUND_TEMPLATE_TEMPLATE_PARM
+ || BOUND_TEMPLATE_TEMPLATE_PARM_P (expr)
|| code == TEMPLATE_PARM_INDEX)
write_template_param (expr);
/* Handle literals. */
@@ -2995,9 +2995,10 @@ write_template_param (const tree parm)
switch (TREE_CODE (parm))
{
+ case TEMPLATE_ID_TYPE:
+ gcc_assert (BOUND_TEMPLATE_TEMPLATE_PARM_P (parm));
case TEMPLATE_TYPE_PARM:
case TEMPLATE_TEMPLATE_PARM:
- case BOUND_TEMPLATE_TEMPLATE_PARM:
parm_index = TEMPLATE_TYPE_IDX (parm);
break;
We shouldn't need to handle TEMPLATE_ID_TYPE at all here; our normal
handling of TEMPLATE_ID_TYPE should look through to the underlying
TEMPLATE_TEMPLATE_PARM, and then that comes here.
- if (TREE_CODE (parm) == BOUND_TEMPLATE_TEMPLATE_PARM)
+ if (BOUND_TEMPLATE_TEMPLATE_PARM_P (parm))
{
- templ
- = TI_TEMPLATE (TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (parm));
+ templ = TI_TEMPLATE (TYPE_TEMPLATE_INFO (parm));
if (find_substitution (templ))
return;
}
Likewise.
@@ -5330,7 +5330,7 @@ arg_assoc_type (struct arg_lookup *k, tree type)
/* Associate the return type. */
return arg_assoc_type (k, TREE_TYPE (type));
case TEMPLATE_TYPE_PARM:
- case BOUND_TEMPLATE_TEMPLATE_PARM:
+ case TEMPLATE_ID_TYPE:
return false;
This code was already wrong; as in arg_assoc_class, we should look at
the associated namespaces of the template arguments.
- case BOUND_TEMPLATE_TEMPLATE_PARM:
+ case TEMPLATE_ID_TYPE:
/* Record template parameters such as `T' inside `TT<T>'. */
if (for_each_template_parm (TYPE_TI_ARGS (t), fn, data, pfd->visited,
pfd->include_nondeduced_p))
return error_mark_node;
+
+ if (!BOUND_TEMPLATE_TEMPLATE_PARM_P (t))
+ break;
+
/* Fall through. */
Instead of falling through, the handling of TEMPLATE_ID_TYPE should walk
into TYPE_TI_TEMPLATE.
case TEMPLATE_TYPE_PARM:
case TEMPLATE_TEMPLATE_PARM:
- case BOUND_TEMPLATE_TEMPLATE_PARM:
+ case TEMPLATE_ID_TYPE:
case TEMPLATE_PARM_INDEX:
TEMPLATE_ID_TYPE should get its own case, and we should be able to
handle template template parms and other uses the same way.
@@ -15851,7 +15891,7 @@ template_parm_level_and_index (tree parm, int* level, int* index)
{
if (TREE_CODE (parm) == TEMPLATE_TYPE_PARM
|| TREE_CODE (parm) == TEMPLATE_TEMPLATE_PARM
- || TREE_CODE (parm) == BOUND_TEMPLATE_TEMPLATE_PARM)
+ || BOUND_TEMPLATE_TEMPLATE_PARM_P (parm))
And we shouldn't need to handle it here.
@@ -16216,9 +16256,10 @@ unify (tree tparms, tree targs, tree parm, tree arg, int strict,
within the nested-name-specifier. */
return unify_success (explain_p);
+ case TEMPLATE_ID_TYPE:
+ gcc_assert (BOUND_TEMPLATE_TEMPLATE_PARM_P (parm));
And it should get its own code here, since presumably we can deduce
template arguments from the non-bound-template-template-parm usage as well.
+ case TEMPLATE_ID_TYPE:
+ if (BOUND_TEMPLATE_TEMPLATE_PARM_P (node))
+ /* Fall through. */;
+ else
+ break;
Own code.
if (TREE_CODE (type) == TEMPLATE_TYPE_PARM
- || TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM
+ || BOUND_TEMPLATE_TEMPLATE_PARM_P (type)
|| TREE_CODE (type) == TYPENAME_TYPE)
This should allow all TEMPLATE_ID_TYPE.
@@ -1129,7 +1129,7 @@ comp_template_parms_position (tree t1, tree t2)
tree index1, index2;
gcc_assert (t1 && t2
&& TREE_CODE (t1) == TREE_CODE (t2)
- && (TREE_CODE (t1) == BOUND_TEMPLATE_TEMPLATE_PARM
+ && (BOUND_TEMPLATE_TEMPLATE_PARM_P (t1)
|| TREE_CODE (t1) == TEMPLATE_TEMPLATE_PARM
|| TREE_CODE (t1) == TEMPLATE_TYPE_PARM));
Shouldn't need to handle any TEMPLATE_ID_TYPE.
+ case TEMPLATE_ID_TYPE:
+ if (!BOUND_TEMPLATE_TEMPLATE_PARM_P (t1))
+ {
+ if (!cp_tree_equal (TYPE_TI_TEMPLATE (t1),
+ TYPE_TI_TEMPLATE (t2)))
+ return false;
+ return comp_template_args (TYPE_TI_ARGS (t1),
+ TYPE_TI_ARGS (t2));
+ }
+ else
+ {
+ /* Fall through. */;
+ }
Should handle all TEMPLATE_ID_TYPE the same.
case UNION_TYPE:
if (TYPE_TEMPLATE_INFO (t1) && TYPE_TEMPLATE_INFO (t2)
&& (TYPE_TI_TEMPLATE (t1) == TYPE_TI_TEMPLATE (t2)
- || TREE_CODE (t1) == BOUND_TEMPLATE_TEMPLATE_PARM)
+ || BOUND_TEMPLATE_TEMPLATE_PARM_P (t1))
&& comp_template_args (TYPE_TI_ARGS (t1), TYPE_TI_ARGS (t2)))
Should handle all TEMPLATE_ID_TYPE.
Jason