[{"id":3675383,"web_url":"http://patchwork.ozlabs.org/comment/3675383/","msgid":"","list_archive_url":null,"date":"2026-04-09T15:57:52","subject":"Re: [PATCH] c++/reflection: ICE on member function template splicing\n [PR124794]","submitter":{"id":14370,"url":"http://patchwork.ozlabs.org/api/people/14370/","name":"Marek Polacek","email":"polacek@redhat.com"},"content":"On Thu, Apr 09, 2026 at 06:35:54PM +0300, feedable wrote:\n> cp_parser_splice_expression isn't aware of overload sets in BASELINKs, which may\n> happen when reflecting a non-static member function template, so it treats them\n> like it would free functions.\n> To fix that we reintroduce the BASELINK to finish_id_expression, and pull the\n> scope from the BASELINK.\n> \n> A similar issue occurs in cp_parser_splice_specifier, where additional angle\n> bracket parsing gets confused by BASELINKs and decides not to parse the\n> splice-specialization-specifier.\n> Strip BASELINKs for the purposes of checking and grab the data from the\n> reflection for actual use.\n\nThanks for the patch, but please next time make a comment in the Bugzilla\nthat you're working on the problem.\n\n> \tPR c++/124794\n> \n> gcc/cp/ChangeLog:\n> \n> \t* parser.cc (cp_parser_splice_specifier): Add handling for splicing member\n> \tfunction templates\n> \t(cp_parser_splice_expression): Add parsing for member function template\n> \tspecializations without the \"template\" keyword\n> \n> gcc/testsuite/ChangeLog:\n> \n> \t* g++.dg/reflect/splice12.C: New test.\n> ---\n> gcc/cp/parser.cc | 38 +++++++++++++++++++------\n> gcc/testsuite/g++.dg/reflect/splice12.C | 34 ++++++++++++++++++++++\n> 2 files changed, 63 insertions(+), 9 deletions(-)\n> create mode 100644 gcc/testsuite/g++.dg/reflect/splice12.C\n> \n> diff --git a/gcc/cp/parser.cc b/gcc/cp/parser.cc\n> index 13b9b8f46b4..4393affe8ea 100644\n> --- a/gcc/cp/parser.cc\n> +++ b/gcc/cp/parser.cc\n> @@ -6174,6 +6174,8 @@ cp_parser_splice_specifier (cp_parser *parser, bool template_p = false,\n> /* Get the reflected operand. */\n> expr = splice (expr);\n> \n> + tree expr_real = OVL_FIRST (MAYBE_BASELINK_FUNCTIONS (expr));\n\nmaybe_get_first_fn\n\n> +\n> /* If the next token is a <, it could be a splice-specialization-specifier.\n> But we need to handle \"[:r:] < 42\" where the < doesn't start a template\n> argument list. [temp.names]/3: A < is interpreted as the delimiter of\n> @@ -6185,30 +6187,33 @@ cp_parser_splice_specifier (cp_parser *parser, bool template_p = false,\n> /* As a courtesy to the user, if there is a < after a template\n> \t name, parse the construct as an s-s-s and warn about the missing\n> \t 'template'; it can't be anything else. */\n> - && (template_p\n> -\t || typename_p\n> -\t || TREE_CODE (OVL_FIRST (expr)) == TEMPLATE_DECL))\n> + && (template_p || typename_p || TREE_CODE (expr_real) == TEMPLATE_DECL))\n> {\n> /* For member access splice-specialization-specifier, try to wrap\n> \t non-dependent splice for function template into a BASELINK so\n> \t that cp_parser_template_id can handle it. */\n> if (object_type\n> -\t && DECL_FUNCTION_TEMPLATE_P (OVL_FIRST (expr))\n> +\t && DECL_FUNCTION_TEMPLATE_P (expr_real)\n> \t && !dependent_type_p (object_type))\n> \t{\n> -\t tree scope = DECL_CONTEXT (OVL_FIRST (expr));\n> +\t tree scope = DECL_CONTEXT (expr_real);\n> \t if (scope && CLASS_TYPE_P (scope))\n> \t {\n> \t tree access_path = lookup_base (object_type, scope, ba_unique,\n> \t\t\t\t\t NULL, tf_warning_or_error);\n> \t if (access_path == error_mark_node)\n> \t\texpr = error_mark_node;\n> +\t else if (BASELINK_P (expr))\n> +\t\texpr = build_baselink (access_path, BASELINK_BINFO (expr),\n> +\t\t\t\t\tBASELINK_FUNCTIONS (expr),\n> +\t\t\t\t\tBASELINK_OPTYPE (expr));\n> \t else\n> \t\texpr\n> \t\t = build_baselink (access_path, TYPE_BINFO (object_type),\n> \t\t\t\t expr,\n> -\t\t\t\t IDENTIFIER_CONV_OP_P (OVL_NAME (expr))\n> -\t\t\t\t ? TREE_TYPE (OVL_NAME (expr)) : NULL_TREE);\n> +\t\t\t\t IDENTIFIER_CONV_OP_P (OVL_NAME (expr_real))\n> +\t\t\t\t ? TREE_TYPE (OVL_NAME (expr_real))\n> +\t\t\t\t : NULL_TREE);\n> \t }\n> \t}\n> /* Let cp_parser_template_id parse the template arguments. */\n> @@ -6393,8 +6398,23 @@ cp_parser_splice_expression (cp_parser *parser, bool template_p,\n> \t constexpr auto r = ^^S::i;\n> \t int i = [: r :];\n> \t we need to pass down 'S'. */\n> - tree ctx = DECL_P (t) ? DECL_CONTEXT (t) : NULL_TREE;\n> - t = finish_id_expression (t, t, ctx, idk,\n\nThis code changed about two months ago; we no longer pass ctx to\nfinish_id_expression. Please adjust.\n\n> + tree ctx, decl;\n> + if (BASELINK_P (unresolved))\n> +\t{\n> +\t /* If we have a BASELINK, grab all the data from there */\n> +\t decl = build_baselink (BASELINK_BINFO (unresolved),\n> +\t\t\t\t BASELINK_ACCESS_BINFO(unresolved), t,\n> +\t\t\t\t BASELINK_OPTYPE (unresolved));\n> +\n> +\t ctx = BINFO_TYPE (BASELINK_BINFO (unresolved));\n> +\t}\n> + else\n> +\t{\n> +\t decl = t;\n> +\t ctx = DECL_P (t) ? DECL_CONTEXT (t) : NULL_TREE;\n> +\t}\n> +\n> + t = finish_id_expression (t, decl, ctx, idk,\n> \t\t\t\t/*integral_constant_expression_p=*/false,\n> \t\t\t\t/*allow_non_integral_constant_expr_p=*/true,\n> \t\t\t\t&parser->non_integral_constant_expression_p,\n> diff --git a/gcc/testsuite/g++.dg/reflect/splice12.C b/gcc/testsuite/g++.dg/reflect/splice12.C\n> new file mode 100644\n> index 00000000000..bdce1da2efa\n> --- /dev/null\n> +++ b/gcc/testsuite/g++.dg/reflect/splice12.C\n> @@ -0,0 +1,34 @@\n> +// PR c++/124794\n> +// { dg-do compile { target c++26 } }\n> +// { dg-additional-options \"-freflection -Wno-error=missing-template-keyword\" }\n> +\n> +struct C { template void f(T); };\n> +void (C::*p1)(int) = &template[:^^C::f:];\n> +void (C::*p2)(int) = &[:^^C::f:]; // { dg-warning \"keyword before dependent template name\" }\n> +void (C::*p3)(int) = &template[:^^C::f:];\n> +void (C::*p4)(int) = &[:^^C::f:]; // { dg-warning \"keyword before dependent template name\" }\n> +auto p5 = &template[:^^C::f:];\n> +auto p6 = &[:^^C::f:]; // { dg-warning \"keyword before dependent template name\" }\n> +\n> +struct Base1{\n> + template\n> + constexpr T f(T x) {\n> + return x;\n> + }\n> +};\n> +struct Base2: Base1 {\n> + template\n> + constexpr T g(T x) {\n> + return x;\n> + }\n> +};\n> +struct Base3: Base1, Base2 {}; // { dg-warning \"inaccessible\" }\n> +\n> +static_assert(Base1{}.[:^^Base1::f:](13)==13); // { dg-warning \"keyword before dependent template name\" }\n> +static_assert(Base1{}.[:^^Base1::f:](13)==13); // { dg-warning \"keyword before dependent template name\" }\n> +static_assert(Base3{}.[:^^Base2::g:](13)==13); // { dg-warning \"keyword before dependent template name\" }\n> +static_assert(Base3{}.[:^^Base2::g:](13)==13); // { dg-warning \"keyword before dependent template name\" }\n> +constexpr int invalid1 = Base3{}.[:^^Base2::f:]; // { dg-error \"cannot resolve overloaded function\" }\n> +// { dg-warning \"keyword before dependent template name\" \"\" { target *-*-* } .-1 }\n> +constexpr int invalid2 = Base3{}.[:^^Base1::f:]; // { dg-error \"cannot resolve overloaded function\" }\n> +// { dg-warning \"keyword before dependent template name\" \"\" { target *-*-* } .-1 }\n> -- \n> 2.53.0\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=BLCEry1Q;\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=BLCEry1Q","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":3675503,"web_url":"http://patchwork.ozlabs.org/comment/3675503/","msgid":"<9cf1fee1-3b63-4c4f-a73d-318c9837ca33@gmail.com>","list_archive_url":null,"date":"2026-04-09T20:38:43","subject":"Re: [PATCH] c++/reflection: ICE on member function template splicing\n [PR124794]","submitter":{"id":92146,"url":"http://patchwork.ozlabs.org/api/people/92146/","name":"feedable","email":"feedabl3@gmail.com"},"content":"Hi, please take a look at the new version here: https://gcc.gnu.org/pipermail/gcc-patches/2026-April/712609.html\n\nOn 4/9/26 6:57 PM, Marek Polacek wrote:\n\n> On Thu, Apr 09, 2026 at 06:35:54PM +0300, feedable wrote:\n>> cp_parser_splice_expression isn't aware of overload sets in BASELINKs, which may\n>> happen when reflecting a non-static member function template, so it treats them\n>> like it would free functions.\n>> To fix that we reintroduce the BASELINK to finish_id_expression, and pull the\n>> scope from the BASELINK.\n>>\n>> A similar issue occurs in cp_parser_splice_specifier, where additional angle\n>> bracket parsing gets confused by BASELINKs and decides not to parse the\n>> splice-specialization-specifier.\n>> Strip BASELINKs for the purposes of checking and grab the data from the\n>> reflection for actual use.\n> Thanks for the patch, but please next time make a comment in the Bugzilla\n> that you're working on the problem.\n\nAh, sorry, I just got confused when there seemingly was no option to assign myself to an issue. Will do next time!\n\n>> +\n>> /* If the next token is a <, it could be a splice-specialization-specifier.\n>> But we need to handle \"[:r:] < 42\" where the < doesn't start a template\n>> argument list. [temp.names]/3: A < is interpreted as the delimiter of\n>> @@ -6185,30 +6187,33 @@ cp_parser_splice_specifier (cp_parser *parser, bool template_p = false,\n>> /* As a courtesy to the user, if there is a < after a template\n>> \t name, parse the construct as an s-s-s and warn about the missing\n>> \t 'template'; it can't be anything else. */\n>> - && (template_p\n>> -\t || typename_p\n>> -\t || TREE_CODE (OVL_FIRST (expr)) == TEMPLATE_DECL))\n>> + && (template_p || typename_p || TREE_CODE (expr_real) == TEMPLATE_DECL))\n>> {\n>> /* For member access splice-specialization-specifier, try to wrap\n>> \t non-dependent splice for function template into a BASELINK so\n>> \t that cp_parser_template_id can handle it. */\n>> if (object_type\n>> -\t && DECL_FUNCTION_TEMPLATE_P (OVL_FIRST (expr))\n>> +\t && DECL_FUNCTION_TEMPLATE_P (expr_real)\n>> \t && !dependent_type_p (object_type))\n>> \t{\n>> -\t tree scope = DECL_CONTEXT (OVL_FIRST (expr));\n>> +\t tree scope = DECL_CONTEXT (expr_real);\n>> \t if (scope && CLASS_TYPE_P (scope))\n>> \t {\n>> \t tree access_path = lookup_base (object_type, scope, ba_unique,\n>> \t\t\t\t\t NULL, tf_warning_or_error);\n>> \t if (access_path == error_mark_node)\n>> \t\texpr = error_mark_node;\n>> +\t else if (BASELINK_P (expr))\n>> +\t\texpr = build_baselink (access_path, BASELINK_BINFO (expr),\n>> +\t\t\t\t\tBASELINK_FUNCTIONS (expr),\n>> +\t\t\t\t\tBASELINK_OPTYPE (expr));\n>> \t else\n>> \t\texpr\n>> \t\t = build_baselink (access_path, TYPE_BINFO (object_type),\n>> \t\t\t\t expr,\n>> -\t\t\t\t IDENTIFIER_CONV_OP_P (OVL_NAME (expr))\n>> -\t\t\t\t ? TREE_TYPE (OVL_NAME (expr)) : NULL_TREE);\n>> +\t\t\t\t IDENTIFIER_CONV_OP_P (OVL_NAME (expr_real))\n>> +\t\t\t\t ? TREE_TYPE (OVL_NAME (expr_real))\n>> +\t\t\t\t : NULL_TREE);\n>> \t }\n>> \t}\n>> /* Let cp_parser_template_id parse the template arguments. */\n>> @@ -6393,8 +6398,23 @@ cp_parser_splice_expression (cp_parser *parser, bool template_p,\n>> \t constexpr auto r = ^^S::i;\n>> \t int i = [: r :];\n>> \t we need to pass down 'S'. */\n>> - tree ctx = DECL_P (t) ? DECL_CONTEXT (t) : NULL_TREE;\n>> - t = finish_id_expression (t, t, ctx, idk,\n> This code changed about two months ago; we no longer pass ctx to\n> finish_id_expression. Please adjust.\n\nHmm, this changes things considerably: apparently there is also code to handle BASELINKs now too, which is unused because those are stripped.","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 (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=VBc8y0Vi;\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 (2048-bit key,\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=VBc8y0Vi","sourceware.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","sourceware.org; spf=pass smtp.mailfrom=gmail.com","server2.sourceware.org;\n arc=none smtp.remote-ip=209.85.221.45"],"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 4fsBcP4rYrz1yHG\n\tfor ; Fri, 10 Apr 2026 06:39:16 +1000 (AEST)","from vm01.sourceware.org (localhost [127.0.0.1])\n\tby sourceware.org (Postfix) with ESMTP id 52BB54BA2E2A\n\tfor ; Thu, 9 Apr 2026 20:39:14 +0000 (GMT)","from mail-wr1-f45.google.com (mail-wr1-f45.google.com\n [209.85.221.45])\n by sourceware.org (Postfix) with ESMTPS id 5942F4BA2E0D\n for ; Thu, 9 Apr 2026 20:38:46 +0000 (GMT)","by mail-wr1-f45.google.com with SMTP id\n ffacd0b85a97d-43d64313c39so100812f8f.3\n for ; Thu, 09 Apr 2026 13:38:46 -0700 (PDT)","from ?IPV6:2a02:8308:900b:fc00::1bf9? 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