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[69.118.112.187]) by smtp.gmail.com with ESMTPSA id l18-20020a37f912000000b006ce580c2663sm14717419qkj.35.2022.10.04.10.36.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 Oct 2022 10:36:33 -0700 (PDT) To: gcc-patches@gcc.gnu.org Subject: [PATCH] c++ modules: lazy loading from within template [PR99377] Date: Tue, 4 Oct 2022 13:36:31 -0400 Message-Id: <20221004173631.2958133-1-ppalka@redhat.com> X-Mailer: git-send-email 2.38.0.rc2 MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-Spam-Status: No, score=-14.3 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_LOW, 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 X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Patrick Palka via Gcc-patches From: Patrick Palka Reply-To: Patrick Palka Cc: nathan@acm.org Errors-To: gcc-patches-bounces+ouuuleilei=gmail.com@gcc.gnu.org Sender: "Gcc-patches" X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1745779535665825285?= X-GMAIL-MSGID: =?utf-8?q?1745779535665825285?= Here when lazily loading the binding for f at parse time from the template g, processing_template_decl is set and thus the call to note_vague_linkage_fn from module_state::read_cluster has no effect, and we never push f onto deferred_fns and end up never emitting its definition. ISTM the behavior of the lazy loading machinery shouldn't be sensitive to whether we're inside a template, and therefore we should probably be clearing processing_template_decl somewhere e.g in lazy_load_binding. This is sufficient to fix the testcase. But it also seems the processing_template_decl test in note_vague_linkage_fn, added by r8-7539-g977bc3ee11383e for PR84973, is perhaps too strong: if the intent is to avoid deferring output for uninstantiated templates, we should make sure that DECL in question is an uninstantiated template by checking e.g. value_dependent_expression_p. This too is sufficient to fix the testcase (since f isn't a template) and survives bootstrap and regtest. Does one or the other approach look like the correct fix for this PR? PR c++/99377 gcc/cp/ChangeLog: * decl2.cc (note_vague_linkage_fn): Relax processing_template_decl test to value_dependent_expression_p. * module.cc (lazy_load_binding): Clear processing_template_decl. gcc/testsuite/ChangeLog: * g++.dg/modules/pr99377-2_a.C: New test. * g++.dg/modules/pr99377-2_b.C: New test. --- gcc/cp/decl2.cc | 2 +- gcc/cp/module.cc | 2 ++ gcc/testsuite/g++.dg/modules/pr99377-2_a.C | 5 +++++ gcc/testsuite/g++.dg/modules/pr99377-2_b.C | 6 ++++++ 4 files changed, 14 insertions(+), 1 deletion(-) create mode 100644 gcc/testsuite/g++.dg/modules/pr99377-2_a.C create mode 100644 gcc/testsuite/g++.dg/modules/pr99377-2_b.C diff --git a/gcc/cp/decl2.cc b/gcc/cp/decl2.cc index 9f18466192f..5af4d17ee3b 100644 --- a/gcc/cp/decl2.cc +++ b/gcc/cp/decl2.cc @@ -876,7 +876,7 @@ check_classfn (tree ctype, tree function, tree template_parms) void note_vague_linkage_fn (tree decl) { - if (processing_template_decl) + if (value_dependent_expression_p (decl)) return; DECL_DEFER_OUTPUT (decl) = 1; diff --git a/gcc/cp/module.cc b/gcc/cp/module.cc index 500ac06563a..79cbb346ffa 100644 --- a/gcc/cp/module.cc +++ b/gcc/cp/module.cc @@ -19074,6 +19074,8 @@ lazy_load_binding (unsigned mod, tree ns, tree id, binding_slot *mslot) timevar_start (TV_MODULE_IMPORT); + processing_template_decl_sentinel ptds; + /* Stop GC happening, even in outermost loads (because our caller could well be building up a lookup set). */ function_depth++; diff --git a/gcc/testsuite/g++.dg/modules/pr99377-2_a.C b/gcc/testsuite/g++.dg/modules/pr99377-2_a.C new file mode 100644 index 00000000000..26e2bccbbbe --- /dev/null +++ b/gcc/testsuite/g++.dg/modules/pr99377-2_a.C @@ -0,0 +1,5 @@ +// PR c++/99377 +// { dg-additional-options -fmodules-ts } +// { dg-module-cmi pr99377 } +export module pr99377; +export inline void f() { } diff --git a/gcc/testsuite/g++.dg/modules/pr99377-2_b.C b/gcc/testsuite/g++.dg/modules/pr99377-2_b.C new file mode 100644 index 00000000000..69571952c8a --- /dev/null +++ b/gcc/testsuite/g++.dg/modules/pr99377-2_b.C @@ -0,0 +1,6 @@ +// PR c++/99377 +// { dg-additional-options -fmodules-ts } +// { dg-do link } +import pr99377; +template void g() { f(); } +int main() { g(); }