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<h3>

Ben Gamari pushed to branch wip/weak-sanity-race

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

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<h4>

Commits:

</h4>

<ul>

<li>

<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/17c238a88b4d7ba026e780416c134e3c60586b57">17c238a8</a></strong>

<div>

<span>by Ben Gamari</span>

<i>at 2020-11-04T14:43:45-05:00</i>

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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts/Sanity: Avoid nasty race in weak pointer sanity-checking

See Note [Racing weak pointer evacuation] for all of the gory details.

</pre>

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<h4>1 changed file:</h4>

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<a href="#58096134fc46f90956354534c54f43e04f893269">

rts/sm/Sanity.c

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<h4>Changes:</h4>

<li id="58096134fc46f90956354534c54f43e04f893269">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/17c238a88b4d7ba026e780416c134e3c60586b57#58096134fc46f90956354534c54f43e04f893269"><strong>rts/sm/Sanity.c</strong></a>

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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">@@ -233,6 +233,111 @@ checkClosureProfSanity(const StgClosure *p)</td>

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<pre style="margin: 0;"> <span id="LC233" class="line" lang="c"><span class="p">}</span></span>

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<pre style="margin: 0;"> <span id="LC234" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>

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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 [Racing weak pointer evacuation]</span></span>

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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>

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<pre style="margin: 0;">+<span id="LC238" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * While debugging a GC crash (#18919) I noticed a spurious crash due to the</span></span>

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<pre style="margin: 0;">+<span id="LC239" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * end-of-GC sanity check stumbling across a weak pointer with unevacuated key.</span></span>

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<pre style="margin: 0;">+<span id="LC240" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * This can happen when two GC threads race to evacuate a weak pointer.</span></span>

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<pre style="margin: 0;">+<span id="LC241" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Specifically, we start out with a heap with a weak pointer reachable</span></span>

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<pre style="margin: 0;">+<span id="LC242" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * from both a generation's weak pointer list and some other root-reachable</span></span>

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<pre style="margin: 0;">+<span id="LC243" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * closure (e.g. a Just constructor):</span></span>

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<pre style="margin: 0;">+<span id="LC244" 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="LC245" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *            O                      W</span></span>

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<pre style="margin: 0;">+<span id="LC246" 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="LC247" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Root ────→ │ Just     │     ╭───→ │ Weak#    │ ←─────── weak_ptr_list</span></span>

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<pre style="margin: 0;">+<span id="LC248" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Set        ├──────────┤     │     ├──────────┤</span></span>

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<pre style="margin: 0;">+<span id="LC249" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *            │          │ ────╯     │ value    │ ─→ ...</span></span>

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<pre style="margin: 0;">+<span id="LC250" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *            └──────────┘           │ key      │ ───╮    K</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC251" 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="LC252" 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="LC253" 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="LC254" 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="LC255" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * The situation proceeds as follows:</span></span>

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<pre style="margin: 0;">+<span id="LC256" 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="LC257" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * 1. Thread A initiates a GC, wakes up the GC worker threads, and starts</span></span>

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<pre style="margin: 0;">+<span id="LC258" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *    evacuating roots.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC259" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * 2. Thread A evacuates a weak pointer object O to location O'.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC260" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * 3. Thread A fills the block where O' lives and pushes it to its</span></span>

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<pre style="margin: 0;">+<span id="LC261" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *    work-stealing queue.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC262" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * 4. Thread B steals the O' block and starts scavenging it.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC263" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * 5. Thread A enters markWeakPtrList.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC264" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * 6. Thread A starts evacuating W, resulting in Wb'.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC265" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * 7. Thread B scavenges O', evacuating W', resulting in Wa'.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC266" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * 8. Thread A and B are now racing to evacuate W. Only one will win the race</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC267" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *    (due to the CAS in copy_tag). Let the winning copy be called W'.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC268" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * 9. W will be replaced by a forwarding pointer to the winning copy, W'.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC269" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * 10. Whichever thread loses the race will retry evacuation, see</span></span>

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<pre style="margin: 0;">+<span id="LC270" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *     that W has already been evacuated, and proceed as usual.</span></span>

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<pre style="margin: 0;">+<span id="LC271" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * 10. W' will get added to weak_ptr_list by markWeakPtrList.</span></span>

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<pre style="margin: 0;">+<span id="LC272" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * 11. Eventually W' will be scavenged.</span></span>

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<pre style="margin: 0;">+<span id="LC273" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * 12. traverseWeakPtrList will see that W' has been scavenged and evacuate the</span></span>

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<pre style="margin: 0;">+<span id="LC274" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *     its key.</span></span>

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<pre style="margin: 0;">+<span id="LC275" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * 13. However, the copy that lost the race is not on `weak_ptr_list`</span></span>

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<pre style="margin: 0;">+<span id="LC276" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *     and will therefore never get its `key` field scavenged (since</span></span>

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<pre style="margin: 0;">+<span id="LC277" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *     `traverseWeakPtrList` will never see it).</span></span>

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<pre style="margin: 0;">+<span id="LC278" 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="LC279" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Now the heap looks like:</span></span>

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<pre style="margin: 0;">+<span id="LC280" 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="LC281" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *            O'                     W (from-space)</span></span>

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<pre style="margin: 0;">+<span id="LC282" 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="LC283" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Root ────→ │ Just     │           │ Fwd-ptr  │ ───────────╮</span></span>

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<pre style="margin: 0;">+<span id="LC284" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Set        ├──────────┤           ├──────────┤            │</span></span>

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<pre style="margin: 0;">+<span id="LC285" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *            │          │ ────╮     │ value    │ ─→ ...     │</span></span>

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<pre style="margin: 0;">+<span id="LC286" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *            └──────────┘     │     │ key      │ ────────────────────────╮</span></span>

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<pre style="margin: 0;">+<span id="LC287" 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="LC288" 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="289" 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">

289

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<pre style="margin: 0;">+<span id="LC289" 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="290" 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">

290

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<pre style="margin: 0;">+<span id="LC290" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *                             │     Wa'                     │            │</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="236" 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="291" 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">

291

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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="LC291" 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="236" 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="292" 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">

292

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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="LC292" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *                             ╰───→ │ Weak#    │ ←─────┤                 │</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="293" 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">

293

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<pre style="margin: 0;">+<span id="LC293" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *                                   ├──────────┤       ╰─ weak_ptr_list  │</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="236" 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="294" 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">

294

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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="LC294" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *                                   │ value    │ ─→ ...                  │</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="295" 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">

295

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<pre style="margin: 0;">+<span id="LC295" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *                                   │ key      │ ───╮    K'              │</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="236" 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="296" 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">

296

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<pre style="margin: 0;">+<span id="LC296" 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="236" 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="297" 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">

297

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<pre style="margin: 0;">+<span id="LC297" 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="298" 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">

298

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<pre style="margin: 0;">+<span id="LC298" 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="299" 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">

299

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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="LC299" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *                                   Wb'                                  │</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="300" 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">

300

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<pre style="margin: 0;">+<span id="LC300" 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="301" 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">

301

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<pre style="margin: 0;">+<span id="LC301" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *                                   │ Weak#    │                         │</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="302" 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">

302

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<pre style="margin: 0;">+<span id="LC302" 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="303" 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="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC303" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *                                   │ value    │ ─→ ...                  │</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="304" 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">

304

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<pre style="margin: 0;">+<span id="LC304" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *                                   │ key      │ ───╮    K (from-space)  │</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="305" 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">

305

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<pre style="margin: 0;">+<span id="LC305" 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="236" 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="306" 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">

306

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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="LC306" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *                                   └──────────┘    ╰──→ │ 0xaaaaa  │ ←──╯</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="307" 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">

307

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<pre style="margin: 0;">+<span id="LC307" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *                                                        ├──────────┤</span></span>

</pre>

</td>

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<td class="diff-line-num new new_line" data-linenumber="308" 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="LC308" 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="LC309" 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="310" 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="LC310" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Without sanity checking this is fine; we have introduced a spurious copy of</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="311" 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">

311

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<pre style="margin: 0;">+<span id="LC311" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * W, Wb' into the heap but it is unreachable and therefore won't cause any</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC312" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * trouble. However, with sanity checking we may encounter this spurious copy</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC313" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * when walking the heap. Moreover, this copy was never added to weak_ptr_list,</span></span>

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<pre style="margin: 0;">+<span id="LC314" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * meaning that its key field (along with the other fields mark as</span></span>

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<pre style="margin: 0;">+<span id="LC315" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * non-pointers) will not get scavenged and will therefore point into</span></span>

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<pre style="margin: 0;">+<span id="LC316" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * from-space.</span></span>

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<pre style="margin: 0;">+<span id="LC317" 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="LC318" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * To avoid this checkClosure skips over the key field when it sees a weak</span></span>

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<pre style="margin: 0;">+<span id="LC319" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * pointer. Note that all fields of Wb' *other* than the key field should be</span></span>

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<pre style="margin: 0;">+<span id="LC320" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * valid, so we don't skip the closure entirely.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC321" 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="LC322" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * We then do additional checking of all closures on the weak_ptr_lists, where</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC323" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * we *do* check `key`.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC324" 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="LC325" class="line" lang="c"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC326" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Check validity of objects on weak_ptr_list.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC327" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// See Note [Racing weak pointer evacuation].</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC328" 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>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="329" 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="LC329" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">checkGenWeakPtrList</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333;">g</span> <span class="p">)</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="236" 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="330" 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">

330

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<pre style="margin: 0;">+<span id="LC330" class="line" lang="c"><span class="p">{</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="236" 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="331" 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="LC331" class="line" lang="c">  <span class="k" style="font-weight: 600;">for</span> <span class="p">(</span><span class="n" style="color: #333;">StgWeak</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">w</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">generations</span><span class="p">[</span><span class="n" style="color: #333;">g</span><span class="p">].</span><span class="n" style="color: #333;">weak_ptr_list</span><span class="p">;</span> <span class="n" style="color: #333;">w</span> <span class="o" style="font-weight: 600;">!=</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">;</span> <span class="n" style="color: #333;">w</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">w</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">link</span><span class="p">)</span> <span class="p">{</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="236" 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="332" 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="LC332" class="line" lang="c">    <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">LOOKS_LIKE_CLOSURE_PTR</span><span class="p">(</span><span class="n" style="color: #333;">w</span><span class="p">));</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="236" 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="333" 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="LC333" class="line" lang="c">    <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">w</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_WEAK_info</span><span class="p">);</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="236" 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="334" 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="LC334" class="line" lang="c">    <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">LOOKS_LIKE_CLOSURE_PTR</span><span class="p">(</span><span class="n" style="color: #333;">w</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">key</span><span class="p">));</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="236" 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="335" 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="LC335" class="line" lang="c">    <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">LOOKS_LIKE_CLOSURE_PTR</span><span class="p">(</span><span class="n" style="color: #333;">w</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">value</span><span class="p">));</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="236" 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="336" 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="LC336" class="line" lang="c">    <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">LOOKS_LIKE_CLOSURE_PTR</span><span class="p">(</span><span class="n" style="color: #333;">w</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">finalizer</span><span class="p">));</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="236" 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="337" 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="LC337" class="line" lang="c">    <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">LOOKS_LIKE_CLOSURE_PTR</span><span class="p">(</span><span class="n" style="color: #333;">w</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">cfinalizers</span><span class="p">));</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="236" 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="338" 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="LC338" class="line" lang="c">  <span class="p">}</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="236" 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="339" 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="LC339" class="line" lang="c"><span class="p">}</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="236" 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="340" 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="LC340" class="line" lang="c"></span>

</pre>

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<td class="diff-line-num old_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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<td class="diff-line-num new_line" data-linenumber="341" 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="LC341" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Returns closure size in words</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="237" 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="342" 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="LC342" class="line" lang="c"><span class="n" style="color: #333;">StgOffset</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="238" 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="343" 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="LC343" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">checkClosure</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>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="352" 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="457" 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">@@ -352,12 +457,9 @@ checkClosure( const StgClosure* p )</td>

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<pre style="margin: 0;"> <span id="LC457" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">       * representative of the actual layout.</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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<td class="diff-line-num old_line" data-linenumber="354" 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">

354

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<td class="diff-line-num new_line" data-linenumber="459" 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">

459

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<pre style="margin: 0;"> <span id="LC459" class="line" lang="c">      <span class="p">{</span> <span class="n" style="color: #333;">StgWeak</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">w</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">StgWeak</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 old_line" data-linenumber="355" 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">

355

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<td class="diff-line-num new_line old" data-linenumber="460" 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="LC355" class="line" lang="c">        <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">LOOKS_LIKE_CLOSURE_PTR</span><span class="p">(</span><span class="n" style="color: #333;">w</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">key</span><span class="p">));</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="356" 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">

356

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<td class="diff-line-num new_line old" data-linenumber="460" 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="LC356" class="line" lang="c">        <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">LOOKS_LIKE_CLOSURE_PTR</span><span class="p">(</span><span class="n" style="color: #333;">w</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">value</span><span class="p">));</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="357" 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">

357

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<td class="diff-line-num new_line old" data-linenumber="460" 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="LC357" class="line" lang="c">        <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">LOOKS_LIKE_CLOSURE_PTR</span><span class="p">(</span><span class="n" style="color: #333;">w</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">finalizer</span><span class="p">));</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="358" 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">

358

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<td class="diff-line-num new_line old" data-linenumber="460" 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="LC358" class="line" lang="c">        <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">w</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">link</span><span class="p">)</span> <span class="p">{</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="359" 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">

359

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<td class="diff-line-num new_line old" data-linenumber="460" 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="LC359" class="line" lang="c">          <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">LOOKS_LIKE_CLOSURE_PTR</span><span class="p">(</span><span class="n" style="color: #333;">w</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">link</span><span class="p">));</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="360" 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">

360

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<td class="diff-line-num new_line old" data-linenumber="460" 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="LC360" class="line" lang="c">        <span class="p">}</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="361" 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="460" 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">

460

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<pre style="margin: 0;">+<span id="LC460" class="line" lang="c">        <span class="c1" style="color: #998; font-style: italic;">// N.B. Checking most of the fields here is not safe.</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="361" 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="461" 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">

461

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<pre style="margin: 0;">+<span id="LC461" class="line" lang="c">        <span class="c1" style="color: #998; font-style: italic;">// See Note [Racing weak pointer evacuation] for why.</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="361" 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="462" 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">

462

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<pre style="margin: 0;">+<span id="LC462" class="line" lang="c">        <span class="n" style="color: #333;">ASSERT</span><span class="p">(</span><span class="n" style="color: #333;">LOOKS_LIKE_CLOSURE_PTR</span><span class="p">(</span><span class="n" style="color: #333;">w</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">cfinalizers</span><span class="p">));</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="361" 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">

361

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<td class="diff-line-num new_line" data-linenumber="463" 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">

463

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<pre style="margin: 0;"> <span id="LC463" class="line" lang="c">        <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">sizeW_fromITBL</span><span class="p">(</span><span class="n" style="color: #333;">info</span><span class="p">);</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="362" 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">

362

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<td class="diff-line-num new_line" data-linenumber="464" 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">

464

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<pre style="margin: 0;"> <span id="LC464" class="line" lang="c">      <span class="p">}</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="363" 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">

363

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<td class="diff-line-num new_line" data-linenumber="465" 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">

465

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

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

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="852" 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="954" 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">@@ -852,6 +954,12 @@ static void checkGeneration (generation *gen,</td>

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<td class="diff-line-num old_line" data-linenumber="852" 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">

852

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<td class="diff-line-num new_line" data-linenumber="954" 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">

954

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<pre style="margin: 0;"> <span id="LC954" class="line" lang="c">        <span class="n" style="color: #333;">checkHeapChain</span><span class="p">(</span><span class="n" style="color: #333;">ws</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">scavd_list</span><span class="p">);</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="853" 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">

853

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<td class="diff-line-num new_line" data-linenumber="955" 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">

955

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

<pre style="margin: 0;"> <span id="LC955" class="line" lang="c">    <span class="p">}</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="854" 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">

854

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<td class="diff-line-num new_line" data-linenumber="956" 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">

956

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

<pre style="margin: 0;"> <span id="LC956" class="line" lang="c"></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="855" 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="957" 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">

957

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<pre style="margin: 0;">+<span id="LC957" class="line" lang="c">    <span class="c1" style="color: #998; font-style: italic;">// Check weak pointer lists</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="855" 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="958" 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">

958

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<pre style="margin: 0;">+<span id="LC958" class="line" lang="c">    <span class="c1" style="color: #998; font-style: italic;">// See Note [Racing weak pointer evacuation].</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="855" 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="959" 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">

959

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<pre style="margin: 0;">+<span id="LC959" class="line" lang="c">    <span class="k" style="font-weight: 600;">for</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">uint32_t</span> <span class="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span> <span class="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">RtsFlags</span><span class="p">.</span><span class="n" style="color: #333;">GcFlags</span><span class="p">.</span><span class="n" style="color: #333;">generations</span><span class="p">;</span> <span class="n" style="color: #333;">g</span><span class="o" style="font-weight: 600;">++</span><span class="p">)</span> <span class="p">{</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="855" 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="960" 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">

960

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<pre style="margin: 0;">+<span id="LC960" class="line" lang="c">      <span class="n" style="color: #333;">checkGenWeakPtrList</span><span class="p">(</span><span class="n" style="color: #333;">g</span><span class="p">);</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="855" 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="961" 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">

961

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<pre style="margin: 0;">+<span id="LC961" class="line" lang="c">    <span class="p">}</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="855" 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="962" 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">

962

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<pre style="margin: 0;">+<span id="LC962" class="line" lang="c"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="855" 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">

855

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<td class="diff-line-num new_line" data-linenumber="963" 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">

963

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<pre style="margin: 0;"> <span id="LC963" class="line" lang="c">    <span class="n" style="color: #333;">checkLargeObjects</span><span class="p">(</span><span class="n" style="color: #333;">gen</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">large_objects</span><span class="p">);</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="856" 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">

856

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<td class="diff-line-num new_line" data-linenumber="964" 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">

964

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<pre style="margin: 0;"> <span id="LC964" class="line" lang="c">    <span class="n" style="color: #333;">checkCompactObjects</span><span class="p">(</span><span class="n" style="color: #333;">gen</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">compact_objects</span><span class="p">);</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="857" 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">

857

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<td class="diff-line-num new_line" data-linenumber="965" 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">

965

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<pre style="margin: 0;"> <span id="LC965" class="line" lang="c"><span class="p">}</span></span>

</pre>

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