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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:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a8dd6e5e2a7469617b1e0ca93a4022be45532ef">0a8dd6e5</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-11-04T13:18:51-05:00</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.
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<h4>1 changed file:</h4>
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rts/sm/Sanity.c
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<h4>Changes:</h4>
<li id="58096134fc46f90956354534c54f43e04f893269">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a8dd6e5e2a7469617b1e0ca93a4022be45532ef#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 +233,110 @@ 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="LC235" class="line" lang="c"></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>
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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>
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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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255
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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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256
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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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257
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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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258
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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>
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259
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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>
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260
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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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261
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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>
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262
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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>
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263
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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>
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264
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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>
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265
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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>
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266
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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>
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267
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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>
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268
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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>
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269
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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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270
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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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271
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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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272
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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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273
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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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274
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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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275
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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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276
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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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277
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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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278
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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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279
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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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280
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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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281
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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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282
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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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<td class="diff-line-num new new_line" data-linenumber="283" 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">
283
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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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284
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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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285
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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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286
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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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287
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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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288
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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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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>
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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>
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291
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<pre style="margin: 0;">+<span id="LC291" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * │ ┌──────────┐ ╭────╯ │</span></span>
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292
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<pre style="margin: 0;">+<span id="LC292" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * ╰───→ │ Weak# │ ←─────┤ │</span></span>
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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>
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294
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<pre style="margin: 0;">+<span id="LC294" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * │ value │ ─→ ... │</span></span>
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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>
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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>
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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>
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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>
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299
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<pre style="margin: 0;">+<span id="LC299" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Wb' │</span></span>
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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>
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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>
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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>
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303
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<pre style="margin: 0;">+<span id="LC303" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * │ value │ ─→ ... │</span></span>
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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>
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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>
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306
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<pre style="margin: 0;">+<span id="LC306" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * └──────────┘ ╰──→ │ 0xaaaaa │ ←──╯</span></span>
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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>
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308
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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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309
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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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310
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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>
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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>
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312
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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>
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313
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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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314
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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 will not get scavenged and will therefore point</span></span>
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315
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<pre style="margin: 0;">+<span id="LC315" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * into from-space..</span></span>
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316
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<pre style="margin: 0;">+<span id="LC316" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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317
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<pre style="margin: 0;">+<span id="LC317" 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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318
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<pre style="margin: 0;">+<span id="LC318" 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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319
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<pre style="margin: 0;">+<span id="LC319" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * valid, so we don't skip the closure entirely.</span></span>
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320
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<pre style="margin: 0;">+<span id="LC320" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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321
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<pre style="margin: 0;">+<span id="LC321" 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>
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322
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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 *do* check `key`.</span></span>
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323
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<pre style="margin: 0;">+<span id="LC323" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> */</span></span>
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324
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<pre style="margin: 0;">+<span id="LC324" class="line" lang="c"></span>
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325
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<pre style="margin: 0;">+<span id="LC325" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Check validity of objects on weak_ptr_list.</span></span>
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<pre style="margin: 0;">+<span id="LC326" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// See Note [Racing weak pointer evacuation].</span></span>
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<pre style="margin: 0;">+<span id="LC327" 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>
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<pre style="margin: 0;">+<span id="LC328" 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>
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<pre style="margin: 0;">+<span id="LC329" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC330" 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>
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331
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<pre style="margin: 0;">+<span id="LC331" 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>
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332
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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="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">get_itbl</span><span class="p">(</span><span class="n" style="color: #333;">w</span><span class="p">)</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">stg_WEAK_info</span><span class="p">);</span></span>
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333
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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;">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>
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334
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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;">value</span><span class="p">));</span></span>
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335
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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;">finalizer</span><span class="p">));</span></span>
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336
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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;">cfinalizers</span><span class="p">));</span></span>
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<pre style="margin: 0;">+<span id="LC337" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC338" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC339" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC340" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Returns closure size in words</span></span>
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<pre style="margin: 0;"> <span id="LC341" class="line" lang="c"><span class="n" style="color: #333;">StgOffset</span></span>
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<pre style="margin: 0;"> <span id="LC342" 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>
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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">@@ -352,9 +456,11 @@ checkClosure( const StgClosure* p )</td>
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<pre style="margin: 0;"> <span id="LC456" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * representative of the actual layout.</span></span>
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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;"> */</span></span>
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458
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<pre style="margin: 0;"> <span id="LC458" 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>
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355
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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>
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459
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<pre style="margin: 0;">+<span id="LC459" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// N.B. Checking the key is not safe.</span></span>
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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;">// See Note [Racing weak pointer evacuation] for why.</span></span>
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356
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461
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<pre style="margin: 0;"> <span id="LC461" 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>
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357
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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;">finalizer</span><span class="p">));</span></span>
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463
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<pre style="margin: 0;">+<span id="LC463" 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>
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358
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464
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<pre style="margin: 0;"> <span id="LC464" 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>
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359
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465
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<pre style="margin: 0;"> <span id="LC465" 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>
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360
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466
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<pre style="margin: 0;"> <span id="LC466" class="line" lang="c"> <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">@@ -852,6 +958,12 @@ static void checkGeneration (generation *gen,</td>
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852
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958
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<pre style="margin: 0;"> <span id="LC958" 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>
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853
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959
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<pre style="margin: 0;"> <span id="LC959" class="line" lang="c"> <span class="p">}</span></span>
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854
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960
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<pre style="margin: 0;"> <span id="LC960" class="line" lang="c"></span>
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961
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<pre style="margin: 0;">+<span id="LC961" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Check weak pointer lists</span></span>
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962
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<pre style="margin: 0;">+<span id="LC962" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// See Note [Racing weak pointer evacuation].</span></span>
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963
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<pre style="margin: 0;">+<span id="LC963" 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>
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964
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<pre style="margin: 0;">+<span id="LC964" 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>
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965
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<pre style="margin: 0;">+<span id="LC965" class="line" lang="c"> <span class="p">}</span></span>
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966
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<pre style="margin: 0;">+<span id="LC966" class="line" lang="c"></span>
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855
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967
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<pre style="margin: 0;"> <span id="LC967" 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>
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856
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968
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<pre style="margin: 0;"> <span id="LC968" 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>
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857
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969
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<pre style="margin: 0;"> <span id="LC969" class="line" lang="c"><span class="p">}</span></span>
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