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[69.118.112.187]) by smtp.gmail.com with ESMTPSA id r9-20020a37a809000000b006bb82221013sm4245798qke.0.2023.01.25.12.17.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Jan 2023 12:17:02 -0800 (PST) From: Patrick Palka To: gcc-patches@gcc.gnu.org Cc: jason@redhat.com, nathan@acm.org, Patrick Palka Subject: [PATCH] c++ modules: uninstantiated template friend class [PR104234] Date: Wed, 25 Jan 2023 15:16:43 -0500 Message-Id: <20230125201643.506666-1-ppalka@redhat.com> X-Mailer: git-send-email 2.39.1.348.g5dec958dcf MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-13.7 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,GIT_PATCH_0,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: Here we're not clearing DECL_UNINSTANTIATED_TEMPLATE_FRIEND_P for the instantiated/injected template friend class B, which confuses a later call to get_originating_module_decl for B. This patch fixes this by clearing the flag in tsubst_friend_class (as is already done for template friend functions by r11-5730-gf7aeb823d9b0de). After fixing that, we still fail to compile the testcase, rejecting the later definition of B with friend-6_a.C:10:26: error: cannot declare ‘struct B’ in a different module ultimately because DECL_MODULE_ATTACH_P wasn't set on the original (injected) declaration of B. This patch fixes this by calling set_originating_module in tsubst_friend_class, but for that to work it seems we need to relax the assert in this latter function since get_originating_module_decl when called on the TYPE_DECL for B returns the corresponding TEMPLATE_DECL. (Alternatively we can instead call set_originating_module on the TYPE_DECL B as soon as it's created in lookup_template_class (which is what pushtag does), which doesn't need this assert change because at this point the TYPE_DECL doesn't have any TEMPLATE_INFO so get_originating_module_decl becomes a no-op. Would that be preferable?) Bootstrapped and regtested on x86_64-pc-linux-gnu, does this look OK for trunk? PR c++/104234 gcc/cp/ChangeLog: * module.cc (set_originating_module): Document default argument. Relax assert to look through DECL_TEMPLATE_RESULT in the result of get_originating_module_decl. * pt.cc (tsubst_friend_class): Clear DECL_UNINSTANTIATED_TEMPLATE_FRIEND_P and call set_originating_module on the instantiated template friend class. gcc/testsuite/ChangeLog: * g++.dg/modules/friend-6_a.C: New test. --- gcc/cp/module.cc | 8 ++++++-- gcc/cp/pt.cc | 3 +++ gcc/testsuite/g++.dg/modules/friend-6_a.C | 10 ++++++++++ 3 files changed, 19 insertions(+), 2 deletions(-) create mode 100644 gcc/testsuite/g++.dg/modules/friend-6_a.C diff --git a/gcc/cp/module.cc b/gcc/cp/module.cc index 7133009dba5..234ce43b70f 100644 --- a/gcc/cp/module.cc +++ b/gcc/cp/module.cc @@ -18843,14 +18843,18 @@ set_defining_module (tree decl) } void -set_originating_module (tree decl, bool friend_p ATTRIBUTE_UNUSED) +set_originating_module (tree decl, bool friend_p /* = false */) { set_instantiating_module (decl); if (!DECL_NAMESPACE_SCOPE_P (decl)) return; - gcc_checking_assert (friend_p || decl == get_originating_module_decl (decl)); + if (!friend_p) + { + tree o = get_originating_module_decl (decl); + gcc_checking_assert (STRIP_TEMPLATE (o) == decl); + } if (module_attach_p ()) { diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc index cbe5898b553..f2ee74025e7 100644 --- a/gcc/cp/pt.cc +++ b/gcc/cp/pt.cc @@ -11520,6 +11520,9 @@ tsubst_friend_class (tree friend_tmpl, tree args) CLASSTYPE_TI_ARGS (TREE_TYPE (tmpl)) = INNERMOST_TEMPLATE_ARGS (CLASSTYPE_TI_ARGS (TREE_TYPE (tmpl))); + DECL_UNINSTANTIATED_TEMPLATE_FRIEND_P (tmpl) = false; + set_originating_module (DECL_TEMPLATE_RESULT (tmpl)); + /* Substitute into and set the constraints on the new declaration. */ if (tree ci = get_constraints (friend_tmpl)) { diff --git a/gcc/testsuite/g++.dg/modules/friend-6_a.C b/gcc/testsuite/g++.dg/modules/friend-6_a.C new file mode 100644 index 00000000000..97017e4ee78 --- /dev/null +++ b/gcc/testsuite/g++.dg/modules/friend-6_a.C @@ -0,0 +1,10 @@ +// PR c++/104234 +// { dg-additional-options "-fmodules-ts" } +// { dg-module-cmi pr104234 } +export module pr104234; + +template struct A { + template friend struct B; +}; +A a; +template struct B { }; -- 2.39.1.348.g5dec958dcf