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GET /api/patches/810528/?format=api
{ "id": 810528, "url": "http://patchwork.ozlabs.org/api/patches/810528/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/20170906115238.GA129382@adacore.com/", "project": { "id": 17, "url": "http://patchwork.ozlabs.org/api/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, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20170906115238.GA129382@adacore.com>", "list_archive_url": null, "date": "2017-09-06T11:52:38", "name": "[Ada] Crash when issuing warning on uninitialized value", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "1e7f65c6a8913591de7f9096e6b8034c25e7fbd8", "submitter": { "id": 4418, "url": "http://patchwork.ozlabs.org/api/people/4418/?format=api", "name": "Arnaud Charlet", "email": "charlet@adacore.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/20170906115238.GA129382@adacore.com/mbox/", "series": [ { "id": 1774, "url": "http://patchwork.ozlabs.org/api/series/1774/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=1774", "date": "2017-09-06T11:52:38", "name": "[Ada] Crash when issuing warning on uninitialized value", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/1774/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/810528/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/810528/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<gcc-patches-return-461588-incoming=patchwork.ozlabs.org@gcc.gnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": [ "patchwork-incoming@bilbo.ozlabs.org", "mailing list gcc-patches@gcc.gnu.org" ], "Authentication-Results": [ "ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=gcc.gnu.org\n\t(client-ip=209.132.180.131; helo=sourceware.org;\n\tenvelope-from=gcc-patches-return-461588-incoming=patchwork.ozlabs.org@gcc.gnu.org;\n\treceiver=<UNKNOWN>)", "ozlabs.org; dkim=pass (1024-bit key;\n\tunprotected) header.d=gcc.gnu.org header.i=@gcc.gnu.org\n\theader.b=\"mr6hDgl0\"; dkim-atps=neutral", "sourceware.org; auth=none" ], "Received": [ "from sourceware.org (server1.sourceware.org [209.132.180.131])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256\n\tbits)) (No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xnMQq5Y8Hz9sBW\n\tfor <incoming@patchwork.ozlabs.org>;\n\tWed, 6 Sep 2017 21:52:51 +1000 (AEST)", "(qmail 93408 invoked by alias); 6 Sep 2017 11:52:45 -0000", "(qmail 93189 invoked by uid 89); 6 Sep 2017 11:52:44 -0000", "from rock.gnat.com (HELO rock.gnat.com) (205.232.38.15) by\n\tsourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP;\n\tWed, 06 Sep 2017 11:52:39 +0000", "from localhost (localhost.localdomain [127.0.0.1])\tby\n\tfiltered-rock.gnat.com (Postfix) with ESMTP id 55BD05614B;\n\tWed, 6 Sep 2017 07:52:38 -0400 (EDT)", "from rock.gnat.com ([127.0.0.1])\tby localhost (rock.gnat.com\n\t[127.0.0.1]) (amavisd-new, port 10024)\twith LMTP id\n\tTHvNSi+orVpT; Wed, 6 Sep 2017 07:52:38 -0400 (EDT)", "from tron.gnat.com (tron.gnat.com\n\t[IPv6:2620:20:4000:0:46a8:42ff:fe0e:e294])\tby rock.gnat.com\n\t(Postfix) with ESMTP id 455A156142;\n\tWed, 6 Sep 2017 07:52:38 -0400 (EDT)", "by tron.gnat.com (Postfix, from userid 4192)\tid 41A6D4AC;\n\tWed, 6 Sep 2017 07:52:38 -0400 (EDT)" ], "DomainKey-Signature": "a=rsa-sha1; c=nofws; d=gcc.gnu.org; h=list-id\n\t:list-unsubscribe:list-archive:list-post:list-help:sender:date\n\t:from:to:cc:subject:message-id:mime-version:content-type; q=dns;\n\ts=default; b=L1pOr1J5lFwVxq9hsC2rliQQVpxksOgKHWRqOjODgCIjjfbDZT\n\tmPqJB8Xpc68PLUQQkRBMmcYlNpvyb45wTqgb2gyYrHi7g+kJV9EHsNmJnAXongm4\n\t6u7OKIvXtTPegicga+sYjbVFL0IMjuGMAiR28sV1lIDG8F9lCGTM92xSU=", "DKIM-Signature": "v=1; a=rsa-sha1; c=relaxed; d=gcc.gnu.org; h=list-id\n\t:list-unsubscribe:list-archive:list-post:list-help:sender:date\n\t:from:to:cc:subject:message-id:mime-version:content-type; s=\n\tdefault; bh=QoMC9xcgskajtG1ep/ZGtp7r+hM=; b=mr6hDgl0uizb/VS/aBEp\n\tdyaJVJdHSnsEcjpKh9UchOvUkEl/N0tbmdr5fdeFzxUIeRPeh59aTzdyaHCEF2eE\n\tidrStG4szSkdshb/U8w4zITyBzKTqAGnJFuWx6kH8xwGD/Ezv3TMnFZbC10BjvhB\n\tl/pZGm3Yh3dSH5/GdI8V61U=", "Mailing-List": "contact gcc-patches-help@gcc.gnu.org; run by ezmlm", "Precedence": "bulk", "List-Id": "<gcc-patches.gcc.gnu.org>", "List-Unsubscribe": "<mailto:gcc-patches-unsubscribe-incoming=patchwork.ozlabs.org@gcc.gnu.org>", "List-Archive": "<http://gcc.gnu.org/ml/gcc-patches/>", "List-Post": "<mailto:gcc-patches@gcc.gnu.org>", "List-Help": "<mailto:gcc-patches-help@gcc.gnu.org>", "Sender": "gcc-patches-owner@gcc.gnu.org", "X-Virus-Found": "No", "X-Spam-SWARE-Status": "No, score=-11.9 required=5.0 tests=BAYES_00, GIT_PATCH_2,\n\tGIT_PATCH_3, RCVD_IN_DNSWL_NONE,\n\tSPF_PASS autolearn=ham version=3.3.2 spammy=", "X-HELO": "rock.gnat.com", "Date": "Wed, 6 Sep 2017 07:52:38 -0400", "From": "Arnaud Charlet <charlet@adacore.com>", "To": "gcc-patches@gcc.gnu.org", "Cc": "Yannick Moy <moy@adacore.com>", "Subject": "[Ada] Crash when issuing warning on uninitialized value", "Message-ID": "<20170906115238.GA129382@adacore.com>", "MIME-Version": "1.0", "Content-Type": "multipart/mixed; boundary=\"k1lZvvs/B4yU6o8G\"", "Content-Disposition": "inline", "User-Agent": "Mutt/1.5.23 (2014-03-12)" }, "content": "When issuing a warning on a read of an uninitialized variable through\nreading an attribute such as Loop_Entry, GNAT could crash. Now fixed.\n\nGNAT issues a warning as expected on the following code:\n\n $ gcc -c s.adb\n\n 1. package S is\n 2.\n 3. type Array_Range is range 1 .. 10;\n 4.\n 5. type IntArray is array (Array_Range) of Integer;\n 6.\n 7. procedure Move (Dest, Src : aliased out IntArray);\n 8.\n 9. end S;\n\n 1. package body S is\n 2.\n 3. procedure Move (Dest, Src : aliased out IntArray) is\n 4. begin\n 5. for Index in Dest'Range loop\n 6. pragma Assert (for all J in Dest'First .. Index - 1 =>\n 7. Dest (J) = Src'Loop_Entry (J));\n 1 2\n >>> warning: \"Dest\" may be referenced before it has a value\n >>> warning: \"Src\" may be referenced before it has a value\n\n 8.\n 9. Dest (Index) := Src (Index);\n 10. Src (Index) := 0;\n 11. end loop;\n 12. end Move;\n 13.\n 14. end S;\n\nTested on x86_64-pc-linux-gnu, committed on trunk\n\n2017-09-06 Yannick Moy <moy@adacore.com>\n\n\t* sem_warn.adb (Check_References): Take into\n\taccount possibility of attribute reference as original node.", "diff": "Index: sem_warn.adb\n===================================================================\n--- sem_warn.adb\t(revision 251773)\n+++ sem_warn.adb\t(working copy)\n@@ -1382,16 +1382,22 @@\n -- deal with case where original unset reference has been\n -- rewritten during expansion.\n \n- -- In some cases, the original node may be a type conversion\n- -- or qualification, and in this case we want the object\n- -- entity inside.\n+ -- In some cases, the original node may be a type\n+ -- conversion, a qualification or an attribute reference and\n+ -- in this case we want the object entity inside. Same for\n+ -- an expression with actions.\n \n UR := Original_Node (UR);\n while Nkind (UR) = N_Type_Conversion\n or else Nkind (UR) = N_Qualified_Expression\n or else Nkind (UR) = N_Expression_With_Actions\n+ or else Nkind (UR) = N_Attribute_Reference\n loop\n- UR := Expression (UR);\n+ if Nkind (UR) = N_Attribute_Reference then\n+ UR := Prefix (UR);\n+ else\n+ UR := Expression (UR);\n+ end if;\n end loop;\n \n -- Don't issue warning if appearing inside Initial_Condition\n", "prefixes": [ "Ada" ] }