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[130.44.146.16]) by smtp.gmail.com with ESMTPSA id ml7-20020a056214584700b0067f41cef057sm1431995qvb.102.2023.12.18.13.31.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Dec 2023 13:31:38 -0800 (PST) From: Jason Merrill To: gcc-patches@gcc.gnu.org, Nathan Sidwell Cc: Nathaniel Shead , Patrick Palka Subject: [PATCH RFC] c++/modules: __class_type_info and modules Date: Mon, 18 Dec 2023 16:31:35 -0500 Message-Id: <20231218213135.2720773-1-jason@redhat.com> X-Mailer: git-send-email 2.39.3 MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-Spam-Status: No, score=-12.3 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_H3, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_NONE, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gcc-patches-bounces+patchwork=sourceware.org@gcc.gnu.org Tested x86_64-pc-linux-gnu. Does this make sense? Did you have another theory about how to merge these? -- 8< -- Doing a dynamic_cast in both TUs broke because we were declaring a new __class_type_info in _b that conflicted with the one imported in the global module from _a. lookup_elaborated_type has a comment that we probably don't want to find such imports in general, but in this case it seems necessary to make the artificial lazy declarations of RTTI types work. gcc/cp/ChangeLog: * name-lookup.cc (lookup_elaborated_type): Look for bindings in the global namespace in the ABI namespace. gcc/testsuite/ChangeLog: * g++.dg/modules/pr106304_b.C: Add dynamic_cast. --- gcc/cp/name-lookup.cc | 10 ++++++++++ gcc/testsuite/g++.dg/modules/pr106304_b.C | 1 + 2 files changed, 11 insertions(+) base-commit: 5347263b347d02e875879ca40ca6e289ac178919 prerequisite-patch-id: 66735c0c7beb22586ed4b632d10ec9094bb9920c diff --git a/gcc/cp/name-lookup.cc b/gcc/cp/name-lookup.cc index 09dc6ef3e5a..f15b338025d 100644 --- a/gcc/cp/name-lookup.cc +++ b/gcc/cp/name-lookup.cc @@ -8092,6 +8092,16 @@ lookup_elaborated_type (tree name, TAG_how how) // FIXME: This isn't quite right, if we find something // here, from the language PoV we're not supposed to // know it? + // We at least need to do this in __cxxabiv1 to unify lazy + // declarations of __class_type_info in build_dynamic_cast_1. + if (current_namespace == abi_node) + { + tree g = (BINDING_VECTOR_CLUSTER (*slot, 0) + .slots[BINDING_SLOT_GLOBAL]); + for (ovl_iterator iter (g); iter; ++iter) + if (qualify_lookup (*iter, LOOK_want::TYPE)) + return *iter; + } } } } diff --git a/gcc/testsuite/g++.dg/modules/pr106304_b.C b/gcc/testsuite/g++.dg/modules/pr106304_b.C index e8333909c8d..0d1da086176 100644 --- a/gcc/testsuite/g++.dg/modules/pr106304_b.C +++ b/gcc/testsuite/g++.dg/modules/pr106304_b.C @@ -5,4 +5,5 @@ module pr106304; void f(A& a) { as_b(a); + dynamic_cast(&a); }