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<h3>

Ben Gamari pushed to branch wip/gc/T18016

at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>

</h3>

<h4>

Commits:

</h4>

<ul>

<li>

<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3bc91b7a9e33962b816ec81fd2155819c56d210f">3bc91b7a</a></strong>

<div>

<span>by Ben Gamari</span>

<i>at 2020-04-30T12:43:54-04:00</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Fix handling of dirty objects

Previously we (incorrectly) relied on failed_to_evac to be "precise".

That is, we expected it to only be true if *all* of an object's fields

lived outside of the non-moving heap. However, does not match the

behavior of failed_to_evac, which is true if *any* of the object's

fields weren't promoted (meaning that some others *may* live in the

non-moving heap).

This is problematic as we skip the non-moving write barrier for dirty

objects (which we can only safely do if *all* fields point outside of

the non-moving heap).

Clearly this arises due to a fundamental difference in the behavior

expected of failed_to_evac in the moving and non-moving collector.

e.g., in the moving collector it is always safe to conservatively say

failed_to_evac=true whereas in the non-moving collector the safe value

is false.

This issue went unnoticed as I never wrote down the dirtiness

invariant enforced by the non-moving collector. We now define this

invariant as

    An object being marked as dirty implies that all of its fields are

    on the mark queue (or, equivalently, update remembered set).

To maintain this invariant we teach nonmovingScavengeOne to push the

fields of objects which we fail to evacuate to the update remembered

set. This is a simple and reasonably cheap solution and avoids the

complexity and fragility that other, more strict alternative invariants

would require.

All of this is described in a new Note, Note [Dirty flags in the

non-moving collector] in NonMoving.c.

</pre>

</li>

</ul>

<h4>4 changed files:</h4>

<ul>

<li class="file-stats">

<a href="#b4a38dad10ba126e05a0b6adc99aa0c2eb742875">

rts/sm/NonMoving.c

</a>

</li>

<li class="file-stats">

<a href="#4f5ba3ce18ccc17ad367193f379aa61f4c9180a0">

rts/sm/NonMovingMark.c

</a>

</li>

<li class="file-stats">

<a href="#7893c76945f74c60b62878fa12bb5de75b8e1340">

rts/sm/NonMovingScav.c

</a>

</li>

<li class="file-stats">

<a href="#0bfe9d4217bccddd6b00d2d6a5e56e7de4c86273">

rts/sm/Storage.c

</a>

</li>

</ul>

<h4>Changes:</h4>

<li id="b4a38dad10ba126e05a0b6adc99aa0c2eb742875">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3bc91b7a9e33962b816ec81fd2155819c56d210f#b4a38dad10ba126e05a0b6adc99aa0c2eb742875"><strong>rts/sm/NonMoving.c</strong></a>

<hr>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="228" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="228" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -228,6 +228,10 @@ Mutex concurrent_coll_finished_lock;</td>

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<td class="diff-line-num old_line" data-linenumber="228" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

228

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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC228" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *  - Note [Static objects under the nonmoving collector] (Storage.c) describes</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="229" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

229

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<td class="diff-line-num new_line" data-linenumber="229" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

229

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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC229" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *    treatment of static objects.</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC230" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>

</pre>

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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC231" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *  - Note [Dirty flags in the non-moving collector] (NonMoving.c) describes</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="231" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="232" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC232" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *    how we use the DIRTY flags associated with MUT_VARs and TVARs to improve</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="233" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC233" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *    barrier efficiency.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC234" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC235" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="236" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC236" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Note [Concurrent non-moving collection]</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC237" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="369" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="373" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -369,6 +373,7 @@ Mutex concurrent_coll_finished_lock;</td>

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<td class="diff-line-num old_line" data-linenumber="369" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC373" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * approximate due to concurrent collection and ultimately seems more costly</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC374" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * than the problem demands.</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC375" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="372" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC376" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="372" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<td class="diff-line-num new_line" data-linenumber="377" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC377" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Note [Spark management under the nonmoving collector]</span></span>

</pre>

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373

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<pre style="margin: 0;"> <span id="LC378" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

</pre>

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374

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379

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<pre style="margin: 0;"> <span id="LC379" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Every GC, both minor and major, prunes the spark queue (using</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="387" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="392" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -387,6 +392,88 @@ Mutex concurrent_coll_finished_lock;</td>

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387

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<pre style="margin: 0;"> <span id="LC392" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *    BF_EVACUATED flag won't be set on the nursery blocks) and will consequently</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="388" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

388

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<td class="diff-line-num new_line" data-linenumber="393" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

393

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<pre style="margin: 0;"> <span id="LC393" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *    only prune dead sparks living in the non-moving heap.</span></span>

</pre>

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389

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<pre style="margin: 0;"> <span id="LC394" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>

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<pre style="margin: 0;">+<span id="LC395" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>

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<pre style="margin: 0;">+<span id="LC396" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Note [Dirty flags in the non-moving collector]</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="397" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC397" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="398" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC398" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Some mutable object types (e.g. MUT_VARs, TVARs) have a one-bit dirty flag</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="399" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC399" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * encoded in their info table pointer. The moving collector uses this flag</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="400" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC400" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * to minimize redundant mut_list entries. The flag is preserves the following</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="401" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC401" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * simple invariant:</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="402" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC402" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="403" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC403" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *     An object being marked as dirty implies that the object is on mut_list.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="404" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC404" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="405" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC405" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * This allows a nice optimisation in the write barrier (e.g. dirty_MUT_VAR):</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="406" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

406

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<pre style="margin: 0;">+<span id="LC406" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * if we write to an already-dirty object there is no need to</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="407" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

407

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<pre style="margin: 0;">+<span id="LC407" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * push it to the mut_list as we know it's already there.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="408" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

408

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<pre style="margin: 0;">+<span id="LC408" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC409" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * During GC (scavenging) we will then keep track of whether all of the</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="410" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC410" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * object's reference have been promoted. If so we can mark the object as clean.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="411" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC411" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * If not then we re-add it to mut_list and mark it as dirty.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC412" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC413" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * In the non-moving collector we use the same dirty flag to implement a</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="414" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC414" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * related optimisation on the non-moving write barrier: Specifically, the</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC415" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * snapshot invariant only requires that the non-moving write barrier applies</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC416" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * to the *first* mutation to an object after collection begins. To achieve this,</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC417" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * we impose the following invariant:</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC418" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>

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<pre style="margin: 0;">+<span id="LC419" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *     An object being marked as dirty implies that all of its fields are on</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC420" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *     the mark queue (or, equivalently, update remembered set).</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC421" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC422" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * With this guarantee we can safely make the the write barriers dirty objects</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC423" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * no-ops. We perform this optimisation for the following object types:</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC424" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC425" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *  - MVAR</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC426" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *  - TVAR</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC427" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *  - MUT_VAR</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC428" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>

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<pre style="margin: 0;">+<span id="LC429" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * However, maintaining this invariant requires great care. For instance,</span></span>

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<pre style="margin: 0;">+<span id="LC430" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * consider the case of an MVar (which has two pointer fields) before</span></span>

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<pre style="margin: 0;">+<span id="LC431" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * preparatory collection:</span></span>

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<pre style="margin: 0;">+<span id="LC432" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>

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<pre style="margin: 0;">+<span id="LC433" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *    Non-moving heap     ┊      Moving heap</span></span>

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<pre style="margin: 0;">+<span id="LC434" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *         gen 1          ┊         gen 0</span></span>

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<pre style="margin: 0;">+<span id="LC435" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *  ──────────────────────┼────────────────────────────────</span></span>

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<pre style="margin: 0;">+<span id="LC436" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *                        ┊</span></span>

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<pre style="margin: 0;">+<span id="LC437" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *         MVAR A  ────────────────→ X</span></span>

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<pre style="margin: 0;">+<span id="LC438" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *        (dirty)  ───────────╮</span></span>

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<pre style="margin: 0;">+<span id="LC439" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *                        ┊   ╰────→ Y</span></span>

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<pre style="margin: 0;">+<span id="LC440" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *                        ┊          │</span></span>

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<pre style="margin: 0;">+<span id="LC441" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *                        ┊          │</span></span>

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<pre style="margin: 0;">+<span id="LC442" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *           ╭───────────────────────╯</span></span>

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<pre style="margin: 0;">+<span id="LC443" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *           │            ┊</span></span>

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<pre style="margin: 0;">+<span id="LC444" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *           ↓            ┊</span></span>

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<pre style="margin: 0;">+<span id="LC445" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *           Z            ┊</span></span>

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<pre style="margin: 0;">+<span id="LC446" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *                        ┊</span></span>

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<pre style="margin: 0;">+<span id="LC447" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>

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<pre style="margin: 0;">+<span id="LC448" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * During the preparatory collection we promote Y to the nonmoving heap but</span></span>

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<pre style="margin: 0;">+<span id="LC449" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * fail to promote X. Since the failed_to_evac field is conservative (being set</span></span>

</pre>

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450

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<pre style="margin: 0;">+<span id="LC450" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * if *any* of the fields are not promoted), this gives us:</span></span>

</pre>

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451

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<pre style="margin: 0;">+<span id="LC451" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>

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<td class="diff-line-num new new_line" data-linenumber="452" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC452" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *    Non-moving heap     ┊      Moving heap</span></span>

</pre>

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453

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<pre style="margin: 0;">+<span id="LC453" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *         gen 1          ┊         gen 0</span></span>

</pre>

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454

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<pre style="margin: 0;">+<span id="LC454" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *  ──────────────────────┼────────────────────────────────</span></span>

</pre>

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455

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<pre style="margin: 0;">+<span id="LC455" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *                        ┊</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC456" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *         MVAR A  ────────────────→ X</span></span>

</pre>

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457

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<pre style="margin: 0;">+<span id="LC457" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *        (dirty)         ┊</span></span>

</pre>

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458

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<pre style="margin: 0;">+<span id="LC458" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *           │            ┊</span></span>

</pre>

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459

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<pre style="margin: 0;">+<span id="LC459" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *           │            ┊</span></span>

</pre>

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460

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<pre style="margin: 0;">+<span id="LC460" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *           ↓            ┊</span></span>

</pre>

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461

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<pre style="margin: 0;">+<span id="LC461" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *           Y            ┊</span></span>

</pre>

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462

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<pre style="margin: 0;">+<span id="LC462" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *           │            ┊</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="390" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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463

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<pre style="margin: 0;">+<span id="LC463" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *           │            ┊</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="390" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="464" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

464

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<pre style="margin: 0;">+<span id="LC464" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *           ↓            ┊</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="390" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="465" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

465

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<pre style="margin: 0;">+<span id="LC465" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *           Z            ┊</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="466" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

466

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<pre style="margin: 0;">+<span id="LC466" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *                        ┊</span></span>

</pre>

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467

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<pre style="margin: 0;">+<span id="LC467" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="468" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC468" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * This is bad. When we resume mutation a mutator may mutate MVAR A; since it's</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC469" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * already dirty we would fail to add Y to the update remembered set, breaking the</span></span>

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<pre style="margin: 0;">+<span id="LC470" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * snapshot invariant and potentially losing track of the liveness of Z.</span></span>

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<pre style="margin: 0;">+<span id="LC471" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>

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<pre style="margin: 0;">+<span id="LC472" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * To avoid this nonmovingScavengeOne we eagerly pushes the values of the</span></span>

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<pre style="margin: 0;">+<span id="LC473" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * fields of all objects which it fails to evacuate (e.g. MVAR A) to the update</span></span>

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<pre style="margin: 0;">+<span id="LC474" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * remembered set during the preparatory GC. This allows us to safely skip the</span></span>

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<pre style="margin: 0;">+<span id="LC475" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * non-moving write barrier without jeopardizing the snapshot invariant.</span></span>

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<pre style="margin: 0;">+<span id="LC476" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>

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<pre style="margin: 0;"> <span id="LC477" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> */</span></span>

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<pre style="margin: 0;"> <span id="LC478" class="line" lang="c"></span>

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<pre style="margin: 0;"> <span id="LC479" class="line" lang="c"><span class="n" style="color: #333;">memcount</span> <span class="n" style="color: #333;">nonmoving_live_words</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span></span>

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<br>

</li>

<li id="4f5ba3ce18ccc17ad367193f379aa61f4c9180a0">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3bc91b7a9e33962b816ec81fd2155819c56d210f#4f5ba3ce18ccc17ad367193f379aa61f4c9180a0"><strong>rts/sm/NonMovingMark.c</strong></a>

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<pre style="margin: 0;"> <span id="LC27" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "sm/Storage.h"</span></span>

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<pre style="margin: 0;"> <span id="LC28" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "CNF.h"</span></span>

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<pre style="margin: 0;"> <span id="LC29" class="line" lang="c"></span>

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<pre style="margin: 0;">+<span id="LC30" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="n" style="color: #333;">bool</span> <span class="nf" style="color: #900; font-weight: 600;">check_in_nonmoving_heap</span><span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">p</span><span class="p">);</span></span>

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<pre style="margin: 0;"> <span id="LC31" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">mark_closure</span> <span class="p">(</span><span class="n" style="color: #333;">MarkQueue</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">queue</span><span class="p">,</span> <span class="k" style="font-weight: 600;">const</span> <span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">**</span><span class="n" style="color: #333;">origin</span><span class="p">);</span></span>

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<pre style="margin: 0;"> <span id="LC32" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">mark_tso</span> <span class="p">(</span><span class="n" style="color: #333;">MarkQueue</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">queue</span><span class="p">,</span> <span class="n" style="color: #333;">StgTSO</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">tso</span><span class="p">);</span></span>

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<pre style="margin: 0;"> <span id="LC33" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">mark_stack</span> <span class="p">(</span><span class="n" style="color: #333;">MarkQueue</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">queue</span><span class="p">,</span> <span class="n" style="color: #333;">StgStack</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">stack</span><span class="p">);</span></span>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -450,10 +451,17 @@ push (MarkQueue *q, const MarkQueueEnt *ent)</td>

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<pre style="margin: 0;"> <span id="LC451" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span></span>

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<pre style="margin: 0;"> <span id="LC452" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">markQueuePushClosureGC</span> <span class="p">(</span><span class="n" style="color: #333;">MarkQueue</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">q</span><span class="p">,</span> <span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">p</span><span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC453" class="line" lang="c"><span class="p">{</span></span>

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<pre style="margin: 0;">+<span id="LC454" class="line" lang="c">    <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">check_in_nonmoving_heap</span><span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">))</span> <span class="p">{</span></span>

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<pre style="margin: 0;">+<span id="LC455" class="line" lang="c">        <span class="k" style="font-weight: 600;">return</span><span class="p">;</span></span>

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<pre style="margin: 0;">+<span id="LC456" class="line" lang="c">    <span class="p">}</span></span>

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<pre style="margin: 0;">+<span id="LC457" class="line" lang="c"></span>

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<pre style="margin: 0;"> <span id="LC458" class="line" lang="c">    <span class="cm" style="color: #998; font-style: italic;">/* We should not make it here if we are doing a deadlock detect GC.</span></span>

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<pre style="margin: 0;"> <span id="LC459" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">     * See Note [Deadlock detection under nonmoving collector].</span></span>

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<pre style="margin: 0;">+<span id="LC460" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">     * This is actually no longer true due to call in nonmovingScavengeOne</span></span>

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<pre style="margin: 0;">+<span id="LC461" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">     * introduced due to Note [Dirty flags in the non-moving collector]</span></span>

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<pre style="margin: 0;">+<span id="LC462" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">     * (see NonMoving.c).</span></span>

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<pre style="margin: 0;"> <span id="LC463" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">     */</span></span>

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<pre style="margin: 0;">-<span id="LC456" class="line" lang="c">    <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">deadlock_detect_gc</span><span class="p">);</span></span>

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<pre style="margin: 0;">+<span id="LC464" class="line" lang="c">    <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">//</span>ASSERT(!deadlock_detect_gc);</span></span>

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<pre style="margin: 0;"> <span id="LC465" class="line" lang="c"></span>

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<pre style="margin: 0;"> <span id="LC466" class="line" lang="c">    <span class="c1" style="color: #998; font-style: italic;">// Are we at the end of the block?</span></span>

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<pre style="margin: 0;"> <span id="LC467" class="line" lang="c">    <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">q</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">top</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">head</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">MARK_QUEUE_BLOCK_ENTRIES</span><span class="p">)</span> <span class="p">{</span></span>

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<br>

</li>

<li id="7893c76945f74c60b62878fa12bb5de75b8e1340">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3bc91b7a9e33962b816ec81fd2155819c56d210f#7893c76945f74c60b62878fa12bb5de75b8e1340"><strong>rts/sm/NonMovingScav.c</strong></a>

<hr>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="31" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="31" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -31,6 +31,11 @@ nonmovingScavengeOne (StgClosure *q)</td>

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<pre style="margin: 0;"> <span id="LC31" class="line" lang="c">        <span class="n" style="color: #333;">gct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">eager_promotion</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">saved_eager_promotion</span><span class="p">;</span></span>

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<pre style="margin: 0;"> <span id="LC32" class="line" lang="c">        <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">gct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">failed_to_evac</span><span class="p">)</span> <span class="p">{</span></span>

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<pre style="margin: 0;"> <span id="LC33" class="line" lang="c">            <span class="n" style="color: #333;">mvar</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">header</span><span class="p">.</span><span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stg_MVAR_DIRTY_info</span><span class="p">;</span></span>

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<pre style="margin: 0;">+<span id="LC34" class="line" lang="c"></span>

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<pre style="margin: 0;">+<span id="LC35" class="line" lang="c">            <span class="c1" style="color: #998; font-style: italic;">// Note [Dirty flags in the non-moving collector] in NonMoving.c</span></span>

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<pre style="margin: 0;">+<span id="LC36" class="line" lang="c">            <span class="n" style="color: #333;">markQueuePushClosureGC</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">gct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">cap</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">upd_rem_set</span><span class="p">.</span><span class="n" style="color: #333;">queue</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">mvar</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">head</span><span class="p">);</span></span>

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<pre style="margin: 0;">+<span id="LC37" class="line" lang="c">            <span class="n" style="color: #333;">markQueuePushClosureGC</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">gct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">cap</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">upd_rem_set</span><span class="p">.</span><span class="n" style="color: #333;">queue</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">mvar</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">tail</span><span class="p">);</span></span>

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<pre style="margin: 0;">+<span id="LC38" class="line" lang="c">            <span class="n" style="color: #333;">markQueuePushClosureGC</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">gct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">cap</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">upd_rem_set</span><span class="p">.</span><span class="n" style="color: #333;">queue</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">mvar</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">value</span><span class="p">);</span></span>

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<pre style="margin: 0;"> <span id="LC39" class="line" lang="c">        <span class="p">}</span> <span class="k" style="font-weight: 600;">else</span> <span class="p">{</span></span>

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<pre style="margin: 0;"> <span id="LC40" class="line" lang="c">            <span class="n" style="color: #333;">mvar</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">header</span><span class="p">.</span><span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stg_MVAR_CLEAN_info</span><span class="p">;</span></span>

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<pre style="margin: 0;"> <span id="LC41" class="line" lang="c">        <span class="p">}</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="46" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="51" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -46,6 +51,10 @@ nonmovingScavengeOne (StgClosure *q)</td>

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<pre style="margin: 0;"> <span id="LC51" class="line" lang="c">        <span class="n" style="color: #333;">gct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">eager_promotion</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">saved_eager_promotion</span><span class="p">;</span></span>

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<pre style="margin: 0;"> <span id="LC52" class="line" lang="c">        <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">gct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">failed_to_evac</span><span class="p">)</span> <span class="p">{</span></span>

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<pre style="margin: 0;"> <span id="LC53" class="line" lang="c">            <span class="n" style="color: #333;">tvar</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">header</span><span class="p">.</span><span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stg_TVAR_DIRTY_info</span><span class="p">;</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC54" class="line" lang="c"></span>

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<pre style="margin: 0;">+<span id="LC55" class="line" lang="c">            <span class="c1" style="color: #998; font-style: italic;">// Note [Dirty flags in the non-moving collector] in NonMoving.c</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="49" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="56" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC56" class="line" lang="c">            <span class="n" style="color: #333;">markQueuePushClosureGC</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">gct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">cap</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">upd_rem_set</span><span class="p">.</span><span class="n" style="color: #333;">queue</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">tvar</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">current_value</span><span class="p">);</span></span>

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<td class="diff-line-num new new_line" data-linenumber="57" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC57" class="line" lang="c">            <span class="n" style="color: #333;">markQueuePushClosureGC</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">gct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">cap</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">upd_rem_set</span><span class="p">.</span><span class="n" style="color: #333;">queue</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">tvar</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">first_watch_queue_entry</span><span class="p">);</span></span>

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<pre style="margin: 0;"> <span id="LC58" class="line" lang="c">        <span class="p">}</span> <span class="k" style="font-weight: 600;">else</span> <span class="p">{</span></span>

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<pre style="margin: 0;"> <span id="LC59" class="line" lang="c">            <span class="n" style="color: #333;">tvar</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">header</span><span class="p">.</span><span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stg_TVAR_CLEAN_info</span><span class="p">;</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC60" class="line" lang="c">        <span class="p">}</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="160" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="169" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -160,16 +169,21 @@ nonmovingScavengeOne (StgClosure *q)</td>

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<pre style="margin: 0;"> <span id="LC169" class="line" lang="c">    <span class="p">}</span></span>

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<pre style="margin: 0;"> <span id="LC170" class="line" lang="c"></span>

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<pre style="margin: 0;"> <span id="LC171" class="line" lang="c">    <span class="k" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">MUT_VAR_CLEAN</span><span class="p">:</span></span>

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<pre style="margin: 0;">-<span id="LC163" class="line" lang="c">    <span class="k" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">MUT_VAR_DIRTY</span><span class="p">:</span></span>

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<td class="diff-line-num new old_line" data-linenumber="164" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC172" class="line" lang="c">    <span class="k" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">MUT_VAR_DIRTY</span><span class="p">:</span> <span class="p">{</span></span>

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<pre style="margin: 0;">+<span id="LC173" class="line" lang="c">        <span class="n" style="color: #333;">StgMutVar</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">mv</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">StgMutVar</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">p</span><span class="p">;</span></span>

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<td class="diff-line-num new_line" data-linenumber="174" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC174" class="line" lang="c">        <span class="n" style="color: #333;">gct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">eager_promotion</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">false</span><span class="p">;</span></span>

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<td class="diff-line-num old old_line" data-linenumber="165" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="175" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC165" class="line" lang="c">        <span class="n" style="color: #333;">evacuate</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="p"><span class="idiff left">((</span></span><span class="n" style="color: #333;"><span class="idiff">StgMutVar</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">*</span></span><span class="p"><span class="idiff">)</span></span><span class="n" style="color: #333;"><span class="idiff">p</span></span><span class="p"><span class="idiff right">)</span></span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">var</span><span class="p">);</span></span>

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<pre style="margin: 0;">+<span id="LC175" class="line" lang="c">        <span class="n" style="color: #333;">evacuate</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;"><span class="idiff left right">mv</span></span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">var</span><span class="p">);</span></span>

</pre>

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166

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<td class="diff-line-num new_line" data-linenumber="176" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC176" class="line" lang="c">        <span class="n" style="color: #333;">gct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">eager_promotion</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">saved_eager_promotion</span><span class="p">;</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="167" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

167

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177

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<pre style="margin: 0;"> <span id="LC177" class="line" lang="c">        <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">gct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">failed_to_evac</span><span class="p">)</span> <span class="p">{</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="168" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

168

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<td class="diff-line-num new_line" data-linenumber="178" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

178

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<pre style="margin: 0;"> <span id="LC178" class="line" lang="c">            <span class="p">((</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">q</span><span class="p">)</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">header</span><span class="p">.</span><span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stg_MUT_VAR_DIRTY_info</span><span class="p">;</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="169" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="179" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

179

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<pre style="margin: 0;">+<span id="LC179" class="line" lang="c"></span>

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<td class="diff-line-num new old_line" data-linenumber="169" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="180" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC180" class="line" lang="c">            <span class="c1" style="color: #998; font-style: italic;">// Note [Dirty flags in the non-moving collector] in NonMoving.c</span></span>

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<td class="diff-line-num new old_line" data-linenumber="169" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC181" class="line" lang="c">            <span class="n" style="color: #333;">markQueuePushClosureGC</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">gct</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">cap</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">upd_rem_set</span><span class="p">.</span><span class="n" style="color: #333;">queue</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">mv</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">var</span><span class="p">);</span></span>

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182

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<pre style="margin: 0;"> <span id="LC182" class="line" lang="c">        <span class="p">}</span> <span class="k" style="font-weight: 600;">else</span> <span class="p">{</span></span>

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<pre style="margin: 0;"> <span id="LC183" class="line" lang="c">            <span class="p">((</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">q</span><span class="p">)</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">header</span><span class="p">.</span><span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stg_MUT_VAR_CLEAN_info</span><span class="p">;</span></span>

</pre>

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171

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184

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<pre style="margin: 0;"> <span id="LC184" class="line" lang="c">        <span class="p">}</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="172" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

172

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<pre style="margin: 0;"> <span id="LC185" class="line" lang="c">        <span class="k" style="font-weight: 600;">break</span><span class="p">;</span></span>

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<pre style="margin: 0;">+<span id="LC186" class="line" lang="c">    <span class="p">}</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC187" class="line" lang="c"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC188" class="line" lang="c">    <span class="k" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">BLOCKING_QUEUE</span><span class="p">:</span></span>

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<pre style="margin: 0;"> <span id="LC189" class="line" lang="c">    <span class="p">{</span></span>

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<br>

</li>

<li id="0bfe9d4217bccddd6b00d2d6a5e56e7de4c86273">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3bc91b7a9e33962b816ec81fd2155819c56d210f#0bfe9d4217bccddd6b00d2d6a5e56e7de4c86273"><strong>rts/sm/Storage.c</strong></a>

<hr>

<table class="code white" style="font-family: monospace; font-size: 90%;" bgcolor="#fff" width="100%" cellpadding="0" cellspacing="0">

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1304" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1304" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1304,6 +1304,7 @@ dirty_MUT_VAR(StgRegTable *reg, StgMutVar *mvar, StgClosure *old)</td>

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1304

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1304

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<pre style="margin: 0;"> <span id="LC1304" class="line" lang="c">        <span class="n" style="color: #333;">mvar</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">header</span><span class="p">.</span><span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stg_MUT_VAR_DIRTY_info</span><span class="p">;</span></span>

</pre>

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1305

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<td class="diff-line-num new_line" data-linenumber="1305" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1305

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<pre style="margin: 0;"> <span id="LC1305" class="line" lang="c">        <span class="n" style="color: #333;">recordClosureMutated</span><span class="p">(</span><span class="n" style="color: #333;">cap</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">mvar</span><span class="p">);</span></span>

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1306

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<pre style="margin: 0;"> <span id="LC1306" class="line" lang="c">        <span class="n" style="color: #333;">IF_NONMOVING_WRITE_BARRIER_ENABLED</span> <span class="p">{</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1307" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1307" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1307

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<pre style="margin: 0;">+<span id="LC1307" class="line" lang="c">            <span class="c1" style="color: #998; font-style: italic;">// See Note [Dirty flags in the non-moving collector] in NonMoving.c</span></span>

</pre>

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1307

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<td class="diff-line-num new_line" data-linenumber="1308" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1308

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<pre style="margin: 0;"> <span id="LC1308" class="line" lang="c">            <span class="n" style="color: #333;">updateRemembSetPushClosure_</span><span class="p">(</span><span class="n" style="color: #333;">reg</span><span class="p">,</span> <span class="n" style="color: #333;">old</span><span class="p">);</span></span>

</pre>

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1308

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<td class="diff-line-num new_line" data-linenumber="1309" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1309

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<pre style="margin: 0;"> <span id="LC1309" class="line" lang="c">        <span class="p">}</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1309" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1309

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<td class="diff-line-num new_line" data-linenumber="1310" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1310

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<pre style="margin: 0;"> <span id="LC1310" class="line" lang="c">    <span class="p">}</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1326" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1327" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1326,6 +1327,7 @@ dirty_TVAR(Capability *cap, StgTVar *p,</td>

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<td class="diff-line-num old_line" data-linenumber="1326" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1326

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<td class="diff-line-num new_line" data-linenumber="1327" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1327

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<pre style="margin: 0;"> <span id="LC1327" class="line" lang="c">        <span class="n" style="color: #333;">p</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">header</span><span class="p">.</span><span class="n" style="color: #333;">info</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">stg_TVAR_DIRTY_info</span><span class="p">;</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1327" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1327

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<td class="diff-line-num new_line" data-linenumber="1328" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1328

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<pre style="margin: 0;"> <span id="LC1328" class="line" lang="c">        <span class="n" style="color: #333;">recordClosureMutated</span><span class="p">(</span><span class="n" style="color: #333;">cap</span><span class="p">,(</span><span class="n" style="color: #333;">StgClosure</span><span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">p</span><span class="p">);</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1328" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1328

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<td class="diff-line-num new_line" data-linenumber="1329" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1329

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<pre style="margin: 0;"> <span id="LC1329" class="line" lang="c">        <span class="n" style="color: #333;">IF_NONMOVING_WRITE_BARRIER_ENABLED</span> <span class="p">{</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1329" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="1330" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1330

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<pre style="margin: 0;">+<span id="LC1330" class="line" lang="c">            <span class="c1" style="color: #998; font-style: italic;">// See Note [Dirty flags in the non-moving collector] in NonMoving.c</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1329" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1329

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<td class="diff-line-num new_line" data-linenumber="1331" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1331

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<pre style="margin: 0;"> <span id="LC1331" class="line" lang="c">            <span class="n" style="color: #333;">updateRemembSetPushClosure</span><span class="p">(</span><span class="n" style="color: #333;">cap</span><span class="p">,</span> <span class="n" style="color: #333;">old</span><span class="p">);</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1330" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1330

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<td class="diff-line-num new_line" data-linenumber="1332" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1332

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<pre style="margin: 0;"> <span id="LC1332" class="line" lang="c">        <span class="p">}</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1331" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1331

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<td class="diff-line-num new_line" data-linenumber="1333" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1333

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<pre style="margin: 0;"> <span id="LC1333" class="line" lang="c">    <span class="p">}</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1407" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1409" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1407,6 +1409,7 @@ update_MVAR(StgRegTable *reg, StgClosure *p, StgClosure *old_val)</td>

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<td class="diff-line-num old_line" data-linenumber="1407" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1407

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<td class="diff-line-num new_line" data-linenumber="1409" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1409

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<pre style="margin: 0;"> <span id="LC1409" class="line" lang="c"><span class="p">{</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1408" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1408

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<td class="diff-line-num new_line" data-linenumber="1410" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1410

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<pre style="margin: 0;"> <span id="LC1410" class="line" lang="c">    <span class="n" style="color: #333;">Capability</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">cap</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">regTableToCapability</span><span class="p">(</span><span class="n" style="color: #333;">reg</span><span class="p">);</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1409" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1409

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<td class="diff-line-num new_line" data-linenumber="1411" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1411

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<pre style="margin: 0;"> <span id="LC1411" class="line" lang="c">    <span class="n" style="color: #333;">IF_NONMOVING_WRITE_BARRIER_ENABLED</span> <span class="p">{</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1410" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="1412" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1412

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<pre style="margin: 0;">+<span id="LC1412" class="line" lang="c">        <span class="c1" style="color: #998; font-style: italic;">// See Note [Dirty flags in the non-moving collector] in NonMoving.c</span></span>

</pre>

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1410

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<td class="diff-line-num new_line" data-linenumber="1413" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1413

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<pre style="margin: 0;"> <span id="LC1413" class="line" lang="c">        <span class="n" style="color: #333;">StgMVar</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">mvar</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">StgMVar</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">p</span><span class="p">;</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1411" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1411

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<td class="diff-line-num new_line" data-linenumber="1414" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1414

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<pre style="margin: 0;"> <span id="LC1414" class="line" lang="c">        <span class="n" style="color: #333;">updateRemembSetPushClosure</span><span class="p">(</span><span class="n" style="color: #333;">cap</span><span class="p">,</span> <span class="n" style="color: #333;">old_val</span><span class="p">);</span></span>

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<td class="diff-line-num old_line" data-linenumber="1412" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1412

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<td class="diff-line-num new_line" data-linenumber="1415" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1415

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<pre style="margin: 0;"> <span id="LC1415" class="line" lang="c">        <span class="n" style="color: #333;">updateRemembSetPushClosure</span><span class="p">(</span><span class="n" style="color: #333;">cap</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">mvar</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">head</span><span class="p">);</span></span>

</pre>

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