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[69.118.112.187]) by smtp.gmail.com with ESMTPSA id um14-20020a05620a6d8e00b007770673e757sm3920442qkn.94.2023.12.12.10.40.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 Dec 2023 10:40:47 -0800 (PST) From: Patrick Palka To: gcc-patches@gcc.gnu.org Cc: jason@redhat.com, Patrick Palka Subject: [PATCH] c++: unifying FUNCTION_DECLs [PR93740] Date: Tue, 12 Dec 2023 13:40:37 -0500 Message-ID: <20231212184037.3040106-1-ppalka@redhat.com> X-Mailer: git-send-email 2.43.0.76.g1a87c842ec MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-Spam-Status: No, score=-13.6 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_H4, 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+incoming=patchwork.ozlabs.org@gcc.gnu.org Bootstrapped and regtested on x86_64-pc-linux-gnu, does this look OK for trunk? I considered removing the is_overloaded_fn test now as well, but it could in theory be hit (and not subsumed by the type_unknown_p test) for e.g. OVERLOAD of a single FUNCTION_DECL. I wonder if that's something we'd see here? If not, I can remove the test. It seems safe to remove as far as the testsuite is concerned. -- >8 -- unify currently always returns success when unifying two FUNCTION_DECLs (due to the is_overloaded_fn deferment within the default case), which means for the below testcase unify incorrectly matches &A::foo with &A::bar, which leads to deduction failure for the index_of calls due to a bogus base class ambiguity. This patch makes us instead handle unification of FUNCTION_DECL like other decls, i.e. according to their identity. PR c++/93740 gcc/cp/ChangeLog: * pt.cc (unify) : Handle it like FIELD_DECL and TEMPLATE_DECL. gcc/testsuite/ChangeLog: * g++.dg/template/ptrmem34.C: New test. --- gcc/cp/pt.cc | 1 + gcc/testsuite/g++.dg/template/ptrmem34.C | 27 ++++++++++++++++++++++++ 2 files changed, 28 insertions(+) create mode 100644 gcc/testsuite/g++.dg/template/ptrmem34.C diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc index c2ddbff405b..a8966e223f1 100644 --- a/gcc/cp/pt.cc +++ b/gcc/cp/pt.cc @@ -24967,6 +24967,7 @@ unify (tree tparms, tree targs, tree parm, tree arg, int strict, gcc_unreachable (); case FIELD_DECL: + case FUNCTION_DECL: case TEMPLATE_DECL: /* Matched cases are handled by the ARG == PARM test above. */ return unify_template_argument_mismatch (explain_p, parm, arg); diff --git a/gcc/testsuite/g++.dg/template/ptrmem34.C b/gcc/testsuite/g++.dg/template/ptrmem34.C new file mode 100644 index 00000000000..c349ca55639 --- /dev/null +++ b/gcc/testsuite/g++.dg/template/ptrmem34.C @@ -0,0 +1,27 @@ +// PR c++/93740 +// { dg-do compile { target c++11 } } + +struct A { + void foo(); + void bar(); +}; + +template +struct const_val{}; + +template +struct indexed_elem{}; + +using mem_fun_A_foo = const_val; +using mem_fun_A_bar = const_val; + +struct A_indexed_member_funcs + : indexed_elem<0, mem_fun_A_foo>, + indexed_elem<1, mem_fun_A_bar> +{}; + +template +constexpr int index_of(indexed_elem) { return N; } + +static_assert(index_of(A_indexed_member_funcs{}) == 0, ""); +static_assert(index_of(A_indexed_member_funcs{}) == 1, "");