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GET /api/1.1/patches/2226285/?format=api
{ "id": 2226285, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2226285/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/bmm.hhubkr2i8k.gcc.gcc-TEST.redi.26.1.1@forge-stage.sourceware.org/", "project": { "id": 17, "url": "http://patchwork.ozlabs.org/api/1.1/projects/17/?format=api", "name": "GNU Compiler Collection", "link_name": "gcc", "list_id": "gcc-patches.gcc.gnu.org", "list_email": "gcc-patches@gcc.gnu.org", "web_url": null, "scm_url": null, "webscm_url": null }, "msgid": "<bmm.hhubkr2i8k.gcc.gcc-TEST.redi.26.1.1@forge-stage.sourceware.org>", "date": "2026-04-22T10:37:35", "name": "[v1,1/1] libstdc++: Add debug assertions to std::list and std::forward_list", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "350a6f67ecbc96f7ec0c94aedfaf97a3efdd9615", "submitter": { "id": 93210, "url": "http://patchwork.ozlabs.org/api/1.1/people/93210/?format=api", "name": "Jonathan Wakely via Sourceware Forge", "email": "forge-bot+redi@forge-stage.sourceware.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/bmm.hhubkr2i8k.gcc.gcc-TEST.redi.26.1.1@forge-stage.sourceware.org/mbox/", "series": [ { "id": 500986, "url": "http://patchwork.ozlabs.org/api/1.1/series/500986/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=500986", "date": "2026-04-22T10:37:34", "name": "libstdc++: Add debug assertions to std::list and std::forward_list", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500986/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2226285/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2226285/checks/", "tags": {}, "headers": { "Return-Path": "<gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org>", "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 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; dmarc=none (p=none dis=none)\n header.from=forge-stage.sourceware.org", "sourceware.org;\n spf=pass smtp.mailfrom=forge-stage.sourceware.org", "server2.sourceware.org;\n arc=none smtp.remote-ip=38.145.34.39" ], "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 4g0xLb10Jnz1yD5\n\tfor <incoming@patchwork.ozlabs.org>; Wed, 22 Apr 2026 21:09:11 +1000 (AEST)", "from vm01.sourceware.org (localhost [127.0.0.1])\n\tby sourceware.org (Postfix) with ESMTP id 2978342C3660\n\tfor <incoming@patchwork.ozlabs.org>; Wed, 22 Apr 2026 11:09:09 +0000 (GMT)", "from forge-stage.sourceware.org (vm08.sourceware.org [38.145.34.39])\n by sourceware.org (Postfix) with ESMTPS id 27A8C4B920DB\n for <gcc-patches@gcc.gnu.org>; Wed, 22 Apr 2026 10:38:27 +0000 (GMT)", "from forge-stage.sourceware.org (localhost [IPv6:::1])\n (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n key-exchange x25519 server-signature ECDSA (prime256v1) server-digest SHA256)\n (No client certificate requested)\n by forge-stage.sourceware.org (Postfix) with ESMTPS id 030DA42B61\n for <gcc-patches@gcc.gnu.org>; Wed, 22 Apr 2026 10:38:27 +0000 (UTC)" ], "DKIM-Filter": [ "OpenDKIM Filter v2.11.0 sourceware.org 2978342C3660", "OpenDKIM Filter v2.11.0 sourceware.org 27A8C4B920DB" ], "DMARC-Filter": "OpenDMARC Filter v1.4.2 sourceware.org 27A8C4B920DB", "ARC-Filter": "OpenARC Filter v1.0.0 sourceware.org 27A8C4B920DB", "ARC-Seal": "i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1776854307; cv=none;\n b=bgeXyIewm/MPwWCdHxQ4mR912InupadMJi4296u3hlBS2edfLlprnb1n11/f7icpQ1Yqa7th5X56ALVYGAhP7wlCJtiTcB2FuVD9pqVCHxIkM4RzKWLxQ7weQd8Qu9VIe9XQfB6L8AZ+Y4h7tf57RlBot1dZmVmLtd1/4Dj+csA=", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=sourceware.org; s=key;\n t=1776854307; c=relaxed/simple;\n bh=7i48+oaei/q/7PCakG4sJA9E+jcN99wvNQPNZQRXI90=;\n h=From:Date:Subject:To:Message-ID;\n b=bYQnLBCZTm/v5CFJd1+zyEXNvv8kcxkgFmQnTve/Wg5t3GScsVxXcrGHZYn0Wi8RQXfiZ4vFOrttBh++uwSJmPpt9E67vqjaJnjv690RGsOGQVChC+wGQjSem4vtxWEE7poEma8+KqSDZTTkJ5Vif9NAJw9GXZaooMe/LNcjh28=", "ARC-Authentication-Results": "i=1; server2.sourceware.org", "From": "Jonathan Wakely via Sourceware Forge\n <forge-bot+redi@forge-stage.sourceware.org>", "Date": "Wed, 22 Apr 2026 10:37:35 +0000", "Subject": "[PATCH v1 1/1] libstdc++: Add debug assertions to std::list and\n std::forward_list", "To": "gcc-patches mailing list <gcc-patches@gcc.gnu.org>", "Message-ID": "\n <bmm.hhubkr2i8k.gcc.gcc-TEST.redi.26.1.1@forge-stage.sourceware.org>", "X-Mailer": "batrachomyomachia", "X-Pull-Request-Organization": "gcc", "X-Pull-Request-Repository": "gcc-TEST", "X-Pull-Request": "https://forge.sourceware.org/gcc/gcc-TEST/pulls/26", "References": "\n <bmm.hhubkr2i8k.gcc.gcc-TEST.redi.26.1.0@forge-stage.sourceware.org>", "In-Reply-To": "\n <bmm.hhubkr2i8k.gcc.gcc-TEST.redi.26.1.0@forge-stage.sourceware.org>", "X-Patch-URL": "\n https://forge.sourceware.org/redi/gcc/commit/96da5e678a0d3e346fec557485f3e8b770fe56a0", "X-BeenThere": "gcc-patches@gcc.gnu.org", "X-Mailman-Version": "2.1.30", "Precedence": "list", "List-Id": "Gcc-patches mailing list <gcc-patches.gcc.gnu.org>", "List-Unsubscribe": "<https://gcc.gnu.org/mailman/options/gcc-patches>,\n <mailto:gcc-patches-request@gcc.gnu.org?subject=unsubscribe>", "List-Archive": "<https://gcc.gnu.org/pipermail/gcc-patches/>", "List-Post": "<mailto:gcc-patches@gcc.gnu.org>", "List-Help": "<mailto:gcc-patches-request@gcc.gnu.org?subject=help>", "List-Subscribe": "<https://gcc.gnu.org/mailman/listinfo/gcc-patches>,\n <mailto:gcc-patches-request@gcc.gnu.org?subject=subscribe>", "Reply-To": "gcc-patches mailing list <gcc-patches@gcc.gnu.org>, redi@gcc.gnu.org", "Errors-To": "gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org" }, "content": "From: Jonathan Wakely <jwakely@redhat.com>\n\nWhile working on fancy pointer support for the linked lists I noticed\nthey didn't have any debug assertions. This adds the obvious non-empty\nassertions to front(), back(), pop_front() and pop_back().\n\nFor the pop members, adding an assertion to the underlying function that\nerases a member means it also check erase(end()), which is always\ninvalid, and erase(begin()) on an empty list. For those erase members we\ncan also add a check so that we return without doing anything if the\nassertion is disabled, but would have failed had it been enabled.\n\nlibstdc++-v3/ChangeLog:\n\n\t* include/bits/forward_list.h (forward_list::front): Add\n\tnon-empty assertions.\n\t* include/bits/forward_list.tcc (_Fwd_list_base::_M_erase_after):\n\tLikewise. Return immediately if argument is invalid.\n\t* include/bits/stl_list.h (list::front, list::back): Add\n\tnon-empty assertions.\n\t(list::_M_erase): Likewise. Return immediately if argument is\n\tinvalid.\n---\n libstdc++-v3/include/bits/forward_list.h | 3 +++\n libstdc++-v3/include/bits/forward_list.tcc | 6 ++++++\n libstdc++-v3/include/bits/stl_list.h | 19 +++++++++++++++++--\n 3 files changed, 26 insertions(+), 2 deletions(-)", "diff": "diff --git a/libstdc++-v3/include/bits/forward_list.h b/libstdc++-v3/include/bits/forward_list.h\nindex c9238cef96fa..3fac657518cc 100644\n--- a/libstdc++-v3/include/bits/forward_list.h\n+++ b/libstdc++-v3/include/bits/forward_list.h\n@@ -42,6 +42,7 @@\n #include <bits/allocator.h>\n #include <ext/alloc_traits.h>\n #include <ext/aligned_buffer.h>\n+#include <debug/assertions.h>\n #if __glibcxx_ranges_to_container // C++ >= 23\n # include <bits/ranges_base.h> // ranges::begin, ranges::distance etc.\n # include <bits/ranges_util.h> // ranges::subrange\n@@ -884,6 +885,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER\n reference\n front()\n {\n+\t__glibcxx_requires_nonempty();\n \t_Node* __front = static_cast<_Node*>(this->_M_impl._M_head._M_next);\n \treturn *__front->_M_valptr();\n }\n@@ -896,6 +898,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER\n const_reference\n front() const\n {\n+\t__glibcxx_requires_nonempty();\n \t_Node* __front = static_cast<_Node*>(this->_M_impl._M_head._M_next);\n \treturn *__front->_M_valptr();\n }\ndiff --git a/libstdc++-v3/include/bits/forward_list.tcc b/libstdc++-v3/include/bits/forward_list.tcc\nindex 9750c7c0502b..50acdb9f26b7 100644\n--- a/libstdc++-v3/include/bits/forward_list.tcc\n+++ b/libstdc++-v3/include/bits/forward_list.tcc\n@@ -63,6 +63,12 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER\n _Fwd_list_base<_Tp, _Alloc>::\n _M_erase_after(_Fwd_list_node_base* __pos)\n {\n+ if (__pos == nullptr || __pos->_M_next == nullptr) [[__unlikely__]]\n+\t{\n+\t __glibcxx_assert(__pos != nullptr && __pos->_M_next != nullptr);\n+\t return nullptr;\n+\t}\n+\n _Node* __curr = static_cast<_Node*>(__pos->_M_next);\n __pos->_M_next = __curr->_M_next;\n _Node_alloc_traits::destroy(_M_get_Node_allocator(),\ndiff --git a/libstdc++-v3/include/bits/stl_list.h b/libstdc++-v3/include/bits/stl_list.h\nindex 7deb04b4bfe4..d70ba90b8fa7 100644\n--- a/libstdc++-v3/include/bits/stl_list.h\n+++ b/libstdc++-v3/include/bits/stl_list.h\n@@ -59,6 +59,7 @@\n \n #include <bits/concept_check.h>\n #include <ext/alloc_traits.h>\n+#include <debug/assertions.h>\n #if __cplusplus >= 201103L\n #include <initializer_list>\n #include <bits/allocated_ptr.h>\n@@ -1249,7 +1250,10 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11\n _GLIBCXX_NODISCARD\n reference\n front() _GLIBCXX_NOEXCEPT\n- { return *begin(); }\n+ {\n+\t__glibcxx_requires_nonempty();\n+\treturn *begin();\n+ }\n \n /**\n * Returns a read-only (constant) reference to the data at the first\n@@ -1258,7 +1262,10 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11\n _GLIBCXX_NODISCARD\n const_reference\n front() const _GLIBCXX_NOEXCEPT\n- { return *begin(); }\n+ {\n+\t__glibcxx_requires_nonempty();\n+\treturn *begin();\n+ }\n \n /**\n * Returns a read/write reference to the data at the last element\n@@ -1268,6 +1275,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11\n reference\n back() _GLIBCXX_NOEXCEPT\n {\n+\t__glibcxx_requires_nonempty();\n \titerator __tmp = end();\n \t--__tmp;\n \treturn *__tmp;\n@@ -1281,6 +1289,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11\n const_reference\n back() const _GLIBCXX_NOEXCEPT\n {\n+\t__glibcxx_requires_nonempty();\n \tconst_iterator __tmp = end();\n \t--__tmp;\n \treturn *__tmp;\n@@ -2132,6 +2141,12 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11\n void\n _M_erase(iterator __position) _GLIBCXX_NOEXCEPT\n {\n+\tif (__builtin_expect(empty(), 0))\n+\t {\n+\t __glibcxx_requires_nonempty();\n+\t return;\n+\t }\n+\n \tthis->_M_dec_size(1);\n \t__position._M_node->_M_unhook();\n \t_Node* __n = static_cast<_Node*>(__position._M_node);\n", "prefixes": [ "v1", "1/1" ] }