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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-33437] Decorable::declareDecorationWithOwner passes wrong owner pointer to its decorations</title>
                <link>https://jira.mongodb.org/browse/SERVER-33437</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/74d11ae8949bb795c6fc56a56a7bb1ed64a7eb79/src/mongo/util/decorable.h#L110&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;Decorable::declareDecorationWithOwner&lt;/tt&gt;&lt;/a&gt; call instantiates a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/74d11ae8949bb795c6fc56a56a7bb1ed64a7eb79/src/mongo/util/decoration_registry.h#L76&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;constructor function&lt;/a&gt;, which passes the owner pointer given to the decorations container &lt;a href=&quot;https://github.com/mongodb/mongo/blob/74d11ae8949bb795c6fc56a56a7bb1ed64a7eb79/src/mongo/util/decorable.h#L114&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. However, since Decorable is a super class of the class it is enhancing, the &lt;tt&gt;this&lt;/tt&gt; pointer points to where the super class starts, not where the actual decorated class is. Because of this, decorations with owner receive the wrong owner pointer &lt;a href=&quot;https://github.com/mongodb/mongo/blob/74d11ae8949bb795c6fc56a56a7bb1ed64a7eb79/src/mongo/util/decoration_registry.h#L130&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="500941">SERVER-33437</key>
            <summary>Decorable::declareDecorationWithOwner passes wrong owner pointer to its decorations</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="adam.martin@mongodb.com">ADAM Martin</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Thu, 22 Feb 2018 01:21:49 +0000</created>
                <updated>Sun, 29 Oct 2023 22:34:32 +0000</updated>
                            <resolved>Fri, 2 Mar 2018 21:56:14 +0000</resolved>
                                    <version>3.7.2</version>
                                    <fixVersion>3.6.4</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1821911" author="xgen-internal-githook" created="Fri, 2 Mar 2018 21:54:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;adam.martin@10gen.com&apos;, &apos;name&apos;: &apos;ADAM David Alan Martin&apos;, &apos;username&apos;: &apos;adamlsd&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33437&quot; title=&quot;Decorable::declareDecorationWithOwner passes wrong owner pointer to its decorations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33437&quot;&gt;&lt;del&gt;SERVER-33437&lt;/del&gt;&lt;/a&gt; Make Decorables not type-erased.&lt;/p&gt;

&lt;p&gt;The current Decorable system type-erases the most derived (Decorated)&lt;br/&gt;
type when registering Decorations.  This is illegal as derived classes&lt;br/&gt;
which are no longer standard-layout can have the `Decorable` base&lt;br/&gt;
class reordered with respect to the base address of their storage.&lt;/p&gt;

&lt;p&gt;This also removes the &quot;with-owner&quot; forms of declaring a decoration,&lt;br/&gt;
which caused problems with layout.  The decoration handles have&lt;br/&gt;
been modified to provide mechanisms to get back to the owner&lt;br/&gt;
directly, given a pointer or reference to the decoration.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2084f6702cd026bebe61818564814aac3e2f12a3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2084f6702cd026bebe61818564814aac3e2f12a3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1821910" author="xgen-internal-githook" created="Fri, 2 Mar 2018 21:54:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;adam.martin@10gen.com&apos;, &apos;name&apos;: &apos;ADAM David Alan Martin&apos;, &apos;username&apos;: &apos;adamlsd&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33437&quot; title=&quot;Decorable::declareDecorationWithOwner passes wrong owner pointer to its decorations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33437&quot;&gt;&lt;del&gt;SERVER-33437&lt;/del&gt;&lt;/a&gt; Remove dependency upon decorable.&lt;/p&gt;

&lt;p&gt;This is necessitated by the changes made to `Decorable&amp;lt;T&amp;gt;` which&lt;br/&gt;
makes the entire framework a header only library.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/22d0d2cb4f94893de5040289cc4530549c714faa&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/22d0d2cb4f94893de5040289cc4530549c714faa&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="529059">SERVER-34512</issuekey>
        </issuelink>
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