public inbox for gcc-cvs@sourceware.org
help / color / mirror / Atom feed
From: Patrick Palka <ppalka@gcc.gnu.org>
To: gcc-cvs@gcc.gnu.org
Subject: [gcc r13-2775] c++ modules: partial variable template specializations [PR106826]
Date: Thu, 22 Sep 2022 12:47:01 +0000 (GMT) [thread overview]
Message-ID: <20220922124701.0FE03385829D@sourceware.org> (raw)
https://gcc.gnu.org/g:32d8123cd6ce87acb557aec230e8359051316f9f
commit r13-2775-g32d8123cd6ce87acb557aec230e8359051316f9f
Author: Patrick Palka <ppalka@redhat.com>
Date: Thu Sep 22 08:46:23 2022 -0400
c++ modules: partial variable template specializations [PR106826]
With partial variable template specializations, it looks like we
stream the VAR_DECL (i.e. the DECL_TEMPLATE_RESULT of the corresponding
TEMPLATE_DECL) since process_partial_specialization adds it to the
specializations table, but we end up never streaming the corresponding
TEMPLATE_DECL itself that's reachable only from the primary template's
DECL_TEMPLATE_SPECIALIZATIONS list, which leads to this list being
incomplete on stream-in.
The modules machinery already has special logic for streaming partial
specializations of class templates; this patch attempts to generalize
it to handle those of variable templates as well.
PR c++/106826
gcc/cp/ChangeLog:
* module.cc (trees_out::decl_value): Use get_template_info in
the MK_partial case to handle both VAR_DECL and TYPE_DECL.
(trees_out::key_mergeable): Likewise.
(trees_in::key_mergeable): Likewise.
(has_definition): Consider DECL_INITIAL of a partial variable
template specialization.
(depset::hash::make_dependency): Handle partial variable template
specializations too.
gcc/testsuite/ChangeLog:
* g++.dg/modules/partial-2_a.C: New test.
* g++.dg/modules/partial-2_b.C: New test.
Diff:
---
gcc/cp/module.cc | 32 ++++++++++++----------
gcc/testsuite/g++.dg/modules/partial-2_a.C | 43 ++++++++++++++++++++++++++++++
gcc/testsuite/g++.dg/modules/partial-2_b.C | 21 +++++++++++++++
3 files changed, 82 insertions(+), 14 deletions(-)
diff --git a/gcc/cp/module.cc b/gcc/cp/module.cc
index 9a9ef4e3332..f23832cb56a 100644
--- a/gcc/cp/module.cc
+++ b/gcc/cp/module.cc
@@ -7789,8 +7789,9 @@ trees_out::decl_value (tree decl, depset *dep)
}
else
{
- tree_node (CLASSTYPE_TI_TEMPLATE (TREE_TYPE (inner)));
- tree_node (CLASSTYPE_TI_ARGS (TREE_TYPE (inner)));
+ tree ti = get_template_info (inner);
+ tree_node (TI_TEMPLATE (ti));
+ tree_node (TI_ARGS (ti));
}
}
tree_node (get_constraints (decl));
@@ -10625,9 +10626,10 @@ trees_out::key_mergeable (int tag, merge_kind mk, tree decl, tree inner,
case MK_partial:
{
+ tree ti = get_template_info (inner);
key.constraints = get_constraints (inner);
- key.ret = CLASSTYPE_TI_TEMPLATE (TREE_TYPE (inner));
- key.args = CLASSTYPE_TI_ARGS (TREE_TYPE (inner));
+ key.ret = TI_TEMPLATE (ti);
+ key.args = TI_ARGS (ti);
}
break;
}
@@ -10866,8 +10868,8 @@ trees_in::key_mergeable (int tag, merge_kind mk, tree decl, tree inner,
spec; spec = TREE_CHAIN (spec))
{
tree tmpl = TREE_VALUE (spec);
- if (template_args_equal (key.args,
- CLASSTYPE_TI_ARGS (TREE_TYPE (tmpl)))
+ tree ti = get_template_info (tmpl);
+ if (template_args_equal (key.args, TI_ARGS (ti))
&& cp_tree_equal (key.constraints,
get_constraints
(DECL_TEMPLATE_RESULT (tmpl))))
@@ -11381,8 +11383,7 @@ has_definition (tree decl)
case VAR_DECL:
if (DECL_LANG_SPECIFIC (decl)
- && DECL_TEMPLATE_INFO (decl)
- && DECL_USE_TEMPLATE (decl) < 2)
+ && DECL_TEMPLATE_INFO (decl))
return DECL_INITIAL (decl);
else
{
@@ -12498,11 +12499,14 @@ depset::hash::make_dependency (tree decl, entity_kind ek)
if (!dep)
{
- if (DECL_IMPLICIT_TYPEDEF_P (decl)
- /* ... not an enum, for instance. */
- && RECORD_OR_UNION_TYPE_P (TREE_TYPE (decl))
- && TYPE_LANG_SPECIFIC (TREE_TYPE (decl))
- && CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl)) == 2)
+ if ((DECL_IMPLICIT_TYPEDEF_P (decl)
+ /* ... not an enum, for instance. */
+ && RECORD_OR_UNION_TYPE_P (TREE_TYPE (decl))
+ && TYPE_LANG_SPECIFIC (TREE_TYPE (decl))
+ && CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl)) == 2)
+ || (VAR_P (decl)
+ && DECL_LANG_SPECIFIC (decl)
+ && DECL_USE_TEMPLATE (decl) == 2))
{
/* A partial or explicit specialization. Partial
specializations might not be in the hash table, because
@@ -12515,7 +12519,7 @@ depset::hash::make_dependency (tree decl, entity_kind ek)
dep_hash, and then convert the dep we just found into a
redirect. */
- tree ti = TYPE_TEMPLATE_INFO (TREE_TYPE (decl));
+ tree ti = get_template_info (decl);
tree tmpl = TI_TEMPLATE (ti);
tree partial = NULL_TREE;
for (tree spec = DECL_TEMPLATE_SPECIALIZATIONS (tmpl);
diff --git a/gcc/testsuite/g++.dg/modules/partial-2_a.C b/gcc/testsuite/g++.dg/modules/partial-2_a.C
new file mode 100644
index 00000000000..2681bb59ce8
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/partial-2_a.C
@@ -0,0 +1,43 @@
+// PR c++/106826
+// { dg-additional-options -fmodules-ts }
+// { dg-module-cmi pr106826 }
+export module pr106826;
+
+template<class T> constexpr bool is_reference_v = false;
+template<class T> constexpr bool is_reference_v<T&> = true;
+template<class T> constexpr bool is_reference_v<T&&> = true;
+
+struct A {
+ template<class T> static constexpr bool is_reference_v = false;
+};
+
+template<class T> constexpr bool A::is_reference_v<T&> = true;
+template<class T> constexpr bool A::is_reference_v<T&&> = true;
+
+#if __cpp_concepts
+namespace concepts {
+ template<class T> bool is_reference_v;
+
+ template<class T> requires __is_same(T, T&)
+ constexpr bool is_reference_v<T> = true;
+
+ template<class T> requires __is_same(T, T&&) && (!__is_same(T, T&))
+ constexpr bool is_reference_v<T> = true;
+
+ template<class T> requires (!__is_same(T, T&)) && (!__is_same(T, T&&))
+ constexpr bool is_reference_v<T> = false;
+
+ struct A {
+ template<class T> static bool is_reference_v;
+ };
+
+ template<class T> requires __is_same(T, T&)
+ constexpr bool A::is_reference_v<T> = true;
+
+ template<class T> requires __is_same(T, T&&) && (!__is_same(T, T&))
+ constexpr bool A::is_reference_v<T> = true;
+
+ template<class T> requires (!__is_same(T, T&)) && (!__is_same(T, T&&))
+ constexpr bool A::is_reference_v<T> = false;
+}
+#endif
diff --git a/gcc/testsuite/g++.dg/modules/partial-2_b.C b/gcc/testsuite/g++.dg/modules/partial-2_b.C
new file mode 100644
index 00000000000..0af41ef5e5e
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/partial-2_b.C
@@ -0,0 +1,21 @@
+// PR c++/106826
+// { dg-additional-options -fmodules-ts }
+module pr106826;
+
+static_assert(is_reference_v<int&>);
+static_assert(is_reference_v<int&&>);
+static_assert(!is_reference_v<int>);
+
+static_assert(A::is_reference_v<long&>);
+static_assert(A::is_reference_v<long&&>);
+static_assert(!A::is_reference_v<long>);
+
+#if __cpp_concepts
+static_assert(concepts::is_reference_v<char&>);
+static_assert(concepts::is_reference_v<char&&>);
+static_assert(!concepts::is_reference_v<char>);
+
+static_assert(concepts::A::is_reference_v<bool&>);
+static_assert(concepts::A::is_reference_v<bool&&>);
+static_assert(!concepts::A::is_reference_v<bool>);
+#endif
reply other threads:[~2022-09-22 12:47 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220922124701.0FE03385829D@sourceware.org \
--to=ppalka@gcc.gnu.org \
--cc=gcc-cvs@gcc.gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).