[{"id":3679904,"web_url":"http://patchwork.ozlabs.org/comment/3679904/","msgid":"","list_archive_url":null,"date":"2026-04-21T14:11:35","subject":"Re: [PATCH] c++: Fix up iterating expansion stmt b and e var\n handling [PR124927]","submitter":{"id":14370,"url":"http://patchwork.ozlabs.org/api/people/14370/","name":"Marek Polacek","email":"polacek@redhat.com"},"content":"On Tue, Apr 21, 2026 at 08:06:06AM +0200, Jakub Jelinek wrote:\n> Hi!\n> \n> The following testcase ICEs, because the TARGET_EXPR it had has VOID_TYPE\n> TARGET_EXPR_INITIAL and force_target_expr obviously ICEs when trying to\n> create a VOID_TYPE TARGET_EXPR.\n> \n> This patch fixes it by taking the cv_unqualified type of the TARGET_EXPRs\n> before we extract their TARGET_EXPR_INITIAL, so it does the desirable thing\n> of recreating the TARGET_EXPRs with cv unqualified types.\n> \n> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?\n\nNot an approval but LGTM. The code is nicer this way too.\n \n> 2026-04-21 Jakub Jelinek \n> \n> \tPR c++/124927\n> \t* pt.cc (finish_expansion_stmt): Compute types for force_target_expr\n> \tfrom b and e before extracting TARGET_EXPR_INITIAL from it.\n> \n> \t* g++.dg/cpp26/expansion-stmt41.C: New test.\n> \n> --- gcc/cp/pt.cc.jj\t2026-04-16 18:56:51.668066801 +0200\n> +++ gcc/cp/pt.cc\t2026-04-20 13:30:31.137795700 +0200\n> @@ -33499,14 +33499,14 @@ finish_expansion_stmt (tree expansion_st\n> \t so that e.g. b can be incremented, so unwrap the TARGET_EXPRs\n> \t and force TARGET_EXPR with the cv-unqualified type which is\n> \t a hack replacement for a VAR_DECL in a lambda. */\n> +\t tree btype = cv_unqualified (TREE_TYPE (b));\n> +\t tree etype = cv_unqualified (TREE_TYPE (e));\n> \t if (TREE_CODE (b) == TARGET_EXPR)\n> \t b = TARGET_EXPR_INITIAL (b);\n> \t if (TREE_CODE (e) == TARGET_EXPR)\n> \t e = TARGET_EXPR_INITIAL (e);\n> -\t b = force_target_expr (cv_unqualified (TREE_TYPE (b)), b,\n> -\t\t\t\t tf_warning_or_error);\n> -\t e = force_target_expr (cv_unqualified (TREE_TYPE (e)), e,\n> -\t\t\t\t tf_warning_or_error);\n> +\t b = force_target_expr (btype, b, tf_warning_or_error);\n> +\t e = force_target_expr (etype, e, tf_warning_or_error);\n> \t tree w = build_stmt (loc, WHILE_STMT, NULL_TREE, NULL_TREE,\n> \t\t\t NULL_TREE, NULL_TREE, NULL_TREE);\n> \t tree r = get_target_expr (build_zero_cst (ptrdiff_type_node));\n> --- gcc/testsuite/g++.dg/cpp26/expansion-stmt41.C.jj\t2026-04-20 13:49:08.090898732 +0200\n> +++ gcc/testsuite/g++.dg/cpp26/expansion-stmt41.C\t2026-04-20 13:54:28.439482931 +0200\n> @@ -0,0 +1,28 @@\n> +// PR c++/124927\n> +// { dg-do run { target c++23 } }\n> +// { dg-options \"\" }\n> +\n> +#include \n> +#include \n> +\n> +constexpr std::array a { 1, 2, 3, 4, 5 };\n> +constexpr std::array b { 5, 4, 3, 2, 1 };\n> +\n> +int\n> +foo (int i)\n> +{\n> + template for (constexpr auto z : std::views::zip (a, b)) // { dg-warning \"'template for' only available with\" \"\" { target c++23_down } }\n> + if (i == get <0> (z))\n> + return get <1> (z);\n> + return 0;\n> +}\n> +\n> +int\n> +main ()\n> +{\n> + for (int i = 1; i <= 5; ++i)\n> + if (foo (i) != 6 - i)\n> + __builtin_abort ();\n> + if (foo (0) != 0 || foo (6) != 0)\n> + __builtin_abort ();\n> +}\n> \n> \tJakub\n> \n\nMarek","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=EhIZ6y6w;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=38.145.34.32; helo=vm01.sourceware.org;\n envelope-from=gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org;\n receiver=patchwork.ozlabs.org)","sourceware.org;\n\tdkim=pass (1024-bit key,\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=EhIZ6y6w","sourceware.org; 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charset=us-ascii","Content-Disposition":"inline","X-BeenThere":"gcc-patches@gcc.gnu.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Gcc-patches mailing list ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"}},{"id":3679947,"web_url":"http://patchwork.ozlabs.org/comment/3679947/","msgid":"<1b21110a-69e5-4f2d-a610-7895363c18eb@redhat.com>","list_archive_url":null,"date":"2026-04-21T15:29:15","subject":"Re: [PATCH] c++: Fix up iterating expansion stmt b and e var handling\n [PR124927]","submitter":{"id":4337,"url":"http://patchwork.ozlabs.org/api/people/4337/","name":"Jason Merrill","email":"jason@redhat.com"},"content":"On 4/21/26 10:11 AM, Marek Polacek wrote:\n> On Tue, Apr 21, 2026 at 08:06:06AM +0200, Jakub Jelinek wrote:\n>> Hi!\n>>\n>> The following testcase ICEs, because the TARGET_EXPR it had has VOID_TYPE\n>> TARGET_EXPR_INITIAL and force_target_expr obviously ICEs when trying to\n>> create a VOID_TYPE TARGET_EXPR.\n>>\n>> This patch fixes it by taking the cv_unqualified type of the TARGET_EXPRs\n>> before we extract their TARGET_EXPR_INITIAL, so it does the desirable thing\n>> of recreating the TARGET_EXPRs with cv unqualified types.\n>>\n>> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?\n> \n> Not an approval but LGTM. The code is nicer this way too.\n> \n>> 2026-04-21 Jakub Jelinek \n>>\n>> \tPR c++/124927\n>> \t* pt.cc (finish_expansion_stmt): Compute types for force_target_expr\n>> \tfrom b and e before extracting TARGET_EXPR_INITIAL from it.\n>>\n>> \t* g++.dg/cpp26/expansion-stmt41.C: New test.\n>>\n>> --- gcc/cp/pt.cc.jj\t2026-04-16 18:56:51.668066801 +0200\n>> +++ gcc/cp/pt.cc\t2026-04-20 13:30:31.137795700 +0200\n>> @@ -33499,14 +33499,14 @@ finish_expansion_stmt (tree expansion_st\n>> \t so that e.g. b can be incremented, so unwrap the TARGET_EXPRs\n>> \t and force TARGET_EXPR with the cv-unqualified type which is\n>> \t a hack replacement for a VAR_DECL in a lambda. */\n>> +\t tree btype = cv_unqualified (TREE_TYPE (b));\n\nThis could also use initialized_type (b) if we make that function \nnon-static. OK either way.\n\nJason","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=fqUbrXtd;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; helo=vm01.sourceware.org;\n envelope-from=gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org;\n receiver=patchwork.ozlabs.org)","sourceware.org;\n\tdkim=pass (1024-bit key,\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=fqUbrXtd","sourceware.org; dmarc=pass (p=quarantine dis=none)\n header.from=redhat.com","sourceware.org; spf=pass smtp.mailfrom=redhat.com","server2.sourceware.org;\n arc=none smtp.remote-ip=170.10.129.124"],"Received":["from vm01.sourceware.org (vm01.sourceware.org\n [IPv6:2620:52:6:3111::32])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g0R9w0mddz1yCv\n\tfor ; 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