From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by sourceware.org (Postfix) with ESMTPS id C171F3858407 for ; Tue, 29 Nov 2022 12:24:14 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org C171F3858407 Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1669724654; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type; bh=whof3Ow+IHJymPrFWPh9U4BRm7mdh/LgfIvLXJuIjV0=; b=UE2Yl6g1PHbsadlVVYEPqupOvKD/S3GNeIt9fN7xrAih7CyjNcNSC4g7DlNnXK7sa8bZF8 Q9kMUBP64jK/orxaYfd4MMmJ3oNAR1pWucaiGwdbKJJTkLI4TyGPubtib9mJTMPfHNdUqg 4eS8sPdaQewrYEZHHKUXbW+o/aiwA6w= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-474-aJcZ5KqRO1CAd2odOdMlxQ-1; Tue, 29 Nov 2022 07:24:12 -0500 X-MC-Unique: aJcZ5KqRO1CAd2odOdMlxQ-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 95ADD3803907 for ; Tue, 29 Nov 2022 12:24:12 +0000 (UTC) Received: from tucnak.zalov.cz (unknown [10.39.195.114]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 536BF2024CB7; Tue, 29 Nov 2022 12:24:12 +0000 (UTC) Received: from tucnak.zalov.cz (localhost [127.0.0.1]) by tucnak.zalov.cz (8.17.1/8.17.1) with ESMTPS id 2ATCO7Xs4185403 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Tue, 29 Nov 2022 13:24:08 +0100 Received: (from jakub@localhost) by tucnak.zalov.cz (8.17.1/8.17.1/Submit) id 2ATCO7VY4185402; Tue, 29 Nov 2022 13:24:07 +0100 Date: Tue, 29 Nov 2022 13:24:07 +0100 From: Jakub Jelinek To: Jason Merrill Cc: gcc-patches@gcc.gnu.org Subject: [PATCH] c++: Deduce range for structured bindings if expression is not type dependent [PR84469] Message-ID: Reply-To: Jakub Jelinek MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Spam-Status: No, score=-0.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,KAM_SOMETLD_ARE_BAD_TLD,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE,TXREP autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: Hi! As shown on the decomp56.C testcase, if the range for expression when using structured bindings is not type dependent, we deduce the finish the structured binding types only when not in template (cp_convert_range_for takes care of that), but if in templates, do_range_for_auto_deduction is called instead and it doesn't handle structured bindings. During instantiation they are handled later, but during the parsing keeping the structured bindings type dependent when they shouldn't be changes behavior. The following patch calls cp_finish_decomp even from do_range_for_auto_deduction. The patch regresses the OpenMP g++.dg/gomp/for-21.C test (3 errors are gone), I'll post an incremental patch for it momentarily. Otherwise bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk? 2022-11-29 Jakub Jelinek PR c++/84469 * parser.cc (do_range_for_auto_deduction): Add DECOMP_FIRST_NAME and DECOMP_CNT arguments. Call cp_finish_decomp if DECL is a structured binding. (cp_parser_range_for): Adjust do_range_for_auto_deduction caller. (cp_convert_omp_range_for): Likewise. * g++.dg/cpp1z/decomp56.C: New test. * g++.dg/gomp/pr84469.C: New test. --- gcc/cp/parser.cc.jj 2022-11-19 09:21:14.000000000 +0100 +++ gcc/cp/parser.cc 2022-11-25 15:39:15.326262120 +0100 @@ -2342,7 +2342,7 @@ static tree cp_parser_c_for static tree cp_parser_range_for (cp_parser *, tree, tree, tree, bool, unsigned short, bool); static void do_range_for_auto_deduction - (tree, tree); + (tree, tree, tree, unsigned int); static tree cp_parser_perform_range_for_lookup (tree, tree *, tree *); static tree cp_parser_range_for_member_function @@ -13668,7 +13668,8 @@ cp_parser_range_for (cp_parser *parser, if (!type_dependent_expression_p (range_expr) /* do_auto_deduction doesn't mess with template init-lists. */ && !BRACE_ENCLOSED_INITIALIZER_P (range_expr)) - do_range_for_auto_deduction (range_decl, range_expr); + do_range_for_auto_deduction (range_decl, range_expr, decomp_first_name, + decomp_cnt); } else { @@ -13707,7 +13708,8 @@ build_range_temp (tree range_expr) a shortcut version of cp_convert_range_for. */ static void -do_range_for_auto_deduction (tree decl, tree range_expr) +do_range_for_auto_deduction (tree decl, tree range_expr, + tree decomp_first_name, unsigned int decomp_cnt) { tree auto_node = type_uses_auto (TREE_TYPE (decl)); if (auto_node) @@ -13727,6 +13729,8 @@ do_range_for_auto_deduction (tree decl, iter_decl, auto_node, tf_warning_or_error, adc_variable_type); + if (VAR_P (decl) && DECL_DECOMPOSITION_P (decl)) + cp_finish_decomp (decl, decomp_first_name, decomp_cnt); } } } @@ -42981,15 +42985,21 @@ cp_convert_omp_range_for (tree &this_pre && !BRACE_ENCLOSED_INITIALIZER_P (init)) { tree d = decl; + tree decomp_first_name = NULL_TREE; + unsigned decomp_cnt = 0; if (decl != error_mark_node && DECL_HAS_VALUE_EXPR_P (decl)) { tree v = DECL_VALUE_EXPR (decl); if (TREE_CODE (v) == ARRAY_REF && VAR_P (TREE_OPERAND (v, 0)) && DECL_DECOMPOSITION_P (TREE_OPERAND (v, 0))) - d = TREE_OPERAND (v, 0); + { + d = TREE_OPERAND (v, 0); + decomp_cnt = tree_to_uhwi (TREE_OPERAND (v, 1)) + 1; + decomp_first_name = decl; + } } - do_range_for_auto_deduction (d, init); + do_range_for_auto_deduction (d, init, decomp_first_name, decomp_cnt); } cond = global_namespace; incr = NULL_TREE; --- gcc/testsuite/g++.dg/cpp1z/decomp56.C.jj 2022-11-25 15:55:27.673217565 +0100 +++ gcc/testsuite/g++.dg/cpp1z/decomp56.C 2022-11-25 16:08:28.238930284 +0100 @@ -0,0 +1,29 @@ +// PR c++/84469 +// { dg-do compile { target c++11 } } +// { dg-options "" } + +struct A { + template + void bar () const {} + template + void baz () const {} +}; +struct B { A a; }; + +template +void +foo () +{ + A a[1][1]; + for (auto const& [b]: a) // { dg-warning "structured bindings only available with" "" { target c++14_down } } + b.bar (); + B c; + auto const& [d] = c; // { dg-warning "structured bindings only available with" "" { target c++14_down } } + d.baz (); +} + +int +main () +{ + foo (); +} --- gcc/testsuite/g++.dg/gomp/pr84469.C.jj 2022-11-25 15:57:25.805510359 +0100 +++ gcc/testsuite/g++.dg/gomp/pr84469.C 2022-11-25 16:08:40.123758315 +0100 @@ -0,0 +1,24 @@ +// PR c++/84469 +// { dg-do compile { target c++11 } } +// { dg-options "" } + +struct A { + template + void bar () const {} +}; + +template +void +foo () +{ + A a[1][1]; + #pragma omp for + for (auto const& [b]: a) // { dg-warning "structured bindings only available with" "" { target c++14_down } } + b.bar (); +} + +int +main () +{ + foo (); +} Jakub