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<h3>
Ben Gamari pushed to branch wip/T7275
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/adb87d30e883fc119d6fd7a92c9661251cccb891">adb87d30</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-12-10T13:02:23-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Zero shrunk array slop in vanilla RTS
But only when profiling or DEBUG are enabled.
Fixes #17572.
</pre>
</li>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/73f23069b34cea50d237c10125b5814df6b19bff">73f23069</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-12-10T13:02:26-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Enforce that mark-region isn't used with -h
As noted in #9666, the mark-region GC is not compatible with heap
profiling. Also add documentation for this flag.
Closes #9666.
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<h4>5 changed files:</h4>
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<li class="file-stats">
<a href="#6ae923e173536bf0ddb39552416a7e21767287db">
docs/users_guide/runtime_control.rst
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<li class="file-stats">
<a href="#6011cad13b19136953f8ee72df01a66623c5c1b0">
includes/Cmm.h
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<li class="file-stats">
<a href="#640fc6f2f536ba83f1694f9a7ef3d43e2d0428d3">
rts/RtsFlags.c
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<li class="file-stats">
<a href="#0bfe9d4217bccddd6b00d2d6a5e56e7de4c86273">
rts/sm/Storage.c
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<li class="file-stats">
<a href="#b1e674fd735b5ce381ed44eead08cc27332cbdc3">
utils/deriveConstants/Main.hs
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<h4>Changes:</h4>
<li id="6ae923e173536bf0ddb39552416a7e21767287db">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/decf9ef5f770d0fa95cf35608cfdea25c0520091...73f23069b34cea50d237c10125b5814df6b19bff#6ae923e173536bf0ddb39552416a7e21767287db"><strong>docs/users_guide/runtime_control.rst</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="411" 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">@@ -411,6 +411,17 @@ performance.</td>
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<pre style="margin: 0;"> <span id="LC411" class="line" lang="plaintext"> Note that :rts-flag:`--nonmoving-gc` cannot be used with ``-G1``,</span>
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<pre style="margin: 0;"> <span id="LC412" class="line" lang="plaintext"> :rts-flag:`profiling <-hc>` nor :rts-flag:`-c`.</span>
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<pre style="margin: 0;"> <span id="LC413" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC414" class="line" lang="plaintext">.. rts-flag:: -w</span>
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<pre style="margin: 0;">+<span id="LC415" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC416" class="line" lang="plaintext"> :default: off</span>
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<pre style="margin: 0;">+<span id="LC417" class="line" lang="plaintext"> :since: a long time ago</span>
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<pre style="margin: 0;">+<span id="LC418" class="line" lang="plaintext"> :reverse: none</span>
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<pre style="margin: 0;">+<span id="LC420" class="line" lang="plaintext"> Uses a mark-region garbage collection strategy for the oldest-generation heap.</span>
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<pre style="margin: 0;">+<span id="LC421" class="line" lang="plaintext"> Note that this cannot be used in conjunction with heap profiling</span>
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<pre style="margin: 0;">+<span id="LC422" class="line" lang="plaintext"> (:rts-flag:`-hT`) unless linked against the profiling runtime system with</span>
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<pre style="margin: 0;">+<span id="LC423" class="line" lang="plaintext"> :ghc-flag:`-prof`.</span>
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<pre style="margin: 0;"> <span id="LC425" class="line" lang="plaintext">.. rts-flag:: -xn</span>
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<pre style="margin: 0;"> <span id="LC426" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC427" class="line" lang="plaintext"> :default: off</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/decf9ef5f770d0fa95cf35608cfdea25c0520091...73f23069b34cea50d237c10125b5814df6b19bff#6011cad13b19136953f8ee72df01a66623c5c1b0"><strong>includes/Cmm.h</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">@@ -630,7 +630,11 @@</td>
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<pre style="margin: 0;"> <span id="LC630" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#else</span></span>
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<pre style="margin: 0;"> <span id="LC631" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE_SIZE(c, size) </span><span class="cm" style="color: #998; font-style: italic;">/* nothing */</span></span>
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<pre style="margin: 0;"> <span id="LC632" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE(c) </span><span class="cm" style="color: #998; font-style: italic;">/* nothing */</span></span>
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<pre style="margin: 0;">-<span id="LC633" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE_MUTABLE(c, off) </span><span class="cm" style="color: #998; font-style: italic;">/* nothing */</span></span>
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<pre style="margin: 0;">+<span id="LC633" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* This is used to zero slop after shrunk arrays. It is important that we do</span></span>
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<pre style="margin: 0;">+<span id="LC634" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * this whenever profiling is enabled as described in Note [slop on the heap]</span></span>
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<pre style="margin: 0;">+<span id="LC635" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * in Storage.c. */</span></span>
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<pre style="margin: 0;">+<span id="LC636" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define OVERWRITING_CLOSURE_MUTABLE(c, off) \</span></span>
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<pre style="margin: 0;">+<span id="LC637" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> if (RtsFlags_ProfFlags_doHeapProfile(RtsFlags) != 0) { foreign "C" overwritingMutableClosureOfs(c "ptr", off); }</span></span>
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<pre style="margin: 0;"> <span id="LC638" 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="LC639" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC640" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Memory barriers.</span></span>
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<li id="640fc6f2f536ba83f1694f9a7ef3d43e2d0428d3">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/decf9ef5f770d0fa95cf35608cfdea25c0520091...73f23069b34cea50d237c10125b5814df6b19bff#640fc6f2f536ba83f1694f9a7ef3d43e2d0428d3"><strong>rts/RtsFlags.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">@@ -1849,6 +1849,16 @@ static void normaliseRtsOpts (void)</td>
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<pre style="margin: 0;"> <span id="LC1849" class="line" lang="c"> <span class="n" style="color: #333;">barf</span><span class="p">(</span><span class="s" style="color: #d14;">"The non-moving collector doesn't support -G1"</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC1850" class="line" lang="c"> <span class="p">}</span></span>
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1851
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<pre style="margin: 0;"> <span id="LC1851" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC1852" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if !defined(PROFILING) && !defined(DEBUG)</span></span>
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<pre style="margin: 0;">+<span id="LC1853" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// The mark-region collector is incompatible with heap census unless</span></span>
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<pre style="margin: 0;">+<span id="LC1854" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// we zero slop of blackhole'd thunks, which doesn't happen in the</span></span>
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<pre style="margin: 0;">+<span id="LC1855" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// vanilla way. See #9666.</span></span>
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<pre style="margin: 0;">+<span id="LC1856" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">RtsFlags</span><span class="p">.</span><span class="n" style="color: #333;">ProfFlags</span><span class="p">.</span><span class="n" style="color: #333;">doHeapProfile</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;">sweep</span><span class="p">)</span> <span class="p">{</span></span>
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1857
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<pre style="margin: 0;">+<span id="LC1857" class="line" lang="c"> <span class="n" style="color: #333;">barf</span><span class="p">(</span><span class="s" style="color: #d14;">"The mark-region collector can only be used with profiling</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span></span>
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1858
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<pre style="margin: 0;">+<span id="LC1858" class="line" lang="c"> <span class="s" style="color: #d14;">"when linked against the profiled RTS."</span><span class="p">);</span></span>
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1859
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<pre style="margin: 0;">+<span id="LC1859" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1860" 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="LC1861" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC1862" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">RtsFlags</span><span class="p">.</span><span class="n" style="color: #333;">ProfFlags</span><span class="p">.</span><span class="n" style="color: #333;">doHeapProfile</span> <span class="o" style="font-weight: 600;">!=</span> <span class="n" style="color: #333;">NO_HEAP_PROFILING</span> <span class="o" style="font-weight: 600;">&&</span></span>
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<pre style="margin: 0;"> <span id="LC1863" class="line" lang="c"> <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;">useNonmoving</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC1864" class="line" lang="c"> <span class="n" style="color: #333;">barf</span><span class="p">(</span><span class="s" style="color: #d14;">"The non-moving collector doesn't support profiling"</span><span class="p">);</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/decf9ef5f770d0fa95cf35608cfdea25c0520091...73f23069b34cea50d237c10125b5814df6b19bff#0bfe9d4217bccddd6b00d2d6a5e56e7de4c86273"><strong>rts/sm/Storage.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">@@ -953,14 +953,19 @@ accountAllocation(Capability *cap, W_ n)</td>
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<pre style="margin: 0;"> <span id="LC953" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * profiler, see Note [skipping slop in the heap profiler].</span></span>
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<pre style="margin: 0;"> <span id="LC954" 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="LC955" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * In general we zero:</span></span>
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<pre style="margin: 0;">+<span id="LC956" 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="LC957" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * - Pinned object alignment slop, see MEMSET_SLOP_W in allocatePinned.</span></span>
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<pre style="margin: 0;"> <span id="LC958" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * - Large object alignment slop, see MEMSET_SLOP_W in allocatePinned.</span></span>
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<pre style="margin: 0;">-<span id="LC958" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * This is necessary even in the vanilla RTS since the user may trigger a heap</span></span>
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<pre style="margin: 0;">-<span id="LC959" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * census via +RTS -hT even when not linking against the profiled RTS.</span></span>
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<pre style="margin: 0;">-<span id="LC960" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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961
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<pre style="margin: 0;">-<span id="LC961" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Only when profiling we zero:</span></span>
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<pre style="margin: 0;"> <span id="LC959" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * - Shrunk array slop, see OVERWRITING_CLOSURE_MUTABLE.</span></span>
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<pre style="margin: 0;"> <span id="LC960" 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="LC961" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Note that this is necessary even in the vanilla (e.g. non-profiling) RTS</span></span>
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<pre style="margin: 0;">+<span id="LC962" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * since the user may trigger a heap census via +RTS -hT, which can be used</span></span>
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<pre style="margin: 0;">+<span id="LC963" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * even when not linking against the profiled RTS. Failing to zero slop</span></span>
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<pre style="margin: 0;">+<span id="LC964" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * due to array shrinking has resulted in a few nasty bugs (#17572, #9666).</span></span>
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<pre style="margin: 0;">+<span id="LC965" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * However, since array shrink may result in large amounts of slop (unlike</span></span>
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<pre style="margin: 0;">+<span id="LC966" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * alignment), we take care to only zero such slop when heap profiling or DEBUG</span></span>
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<pre style="margin: 0;">+<span id="LC967" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * are enabled.</span></span>
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968
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<pre style="margin: 0;">+<span id="LC968" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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964
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969
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<pre style="margin: 0;"> <span id="LC969" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * When performing LDV profiling or using a (single threaded) debug RTS we zero</span></span>
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965
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970
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<pre style="margin: 0;"> <span id="LC970" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * slop even when overwriting immutable closures, see Note [zeroing slop when</span></span>
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966
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971
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<pre style="margin: 0;"> <span id="LC971" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * overwriting closures].</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/decf9ef5f770d0fa95cf35608cfdea25c0520091...73f23069b34cea50d237c10125b5814df6b19bff#b1e674fd735b5ce381ed44eead08cc27332cbdc3"><strong>utils/deriveConstants/Main.hs</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">@@ -561,6 +561,8 @@ wanteds os = concat</td>
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561
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561
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<pre style="margin: 0;"> <span id="LC561" class="line" lang="haskell"> <span class="p">,</span><span class="n" style="color: #333;">structField</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="s" style="color: #d14;">"StgCompactNFDataBlock"</span> <span class="s" style="color: #d14;">"owner"</span></span>
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562
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562
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<pre style="margin: 0;"> <span id="LC562" class="line" lang="haskell"> <span class="p">,</span><span class="n" style="color: #333;">structField</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="s" style="color: #d14;">"StgCompactNFDataBlock"</span> <span class="s" style="color: #d14;">"next"</span></span>
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563
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563
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<pre style="margin: 0;"> <span id="LC563" class="line" lang="haskell"></span>
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564
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<pre style="margin: 0;">+<span id="LC564" class="line" lang="haskell"> <span class="p">,</span><span class="n" style="color: #333;">structField_</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="s" style="color: #d14;">"RtsFlags_ProfFlags_doHeapProfile"</span></span>
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565
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<pre style="margin: 0;">+<span id="LC565" class="line" lang="haskell"> <span class="s" style="color: #d14;">"RTS_FLAGS"</span> <span class="s" style="color: #d14;">"ProfFlags.doHeapProfile"</span></span>
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564
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566
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<pre style="margin: 0;"> <span id="LC566" class="line" lang="haskell"> <span class="p">,</span><span class="n" style="color: #333;">structField_</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="s" style="color: #d14;">"RtsFlags_ProfFlags_showCCSOnException"</span></span>
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565
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567
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<pre style="margin: 0;"> <span id="LC567" class="line" lang="haskell"> <span class="s" style="color: #d14;">"RTS_FLAGS"</span> <span class="s" style="color: #d14;">"ProfFlags.showCCSOnException"</span></span>
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566
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568
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<pre style="margin: 0;"> <span id="LC568" class="line" lang="haskell"> <span class="p">,</span><span class="n" style="color: #333;">structField_</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="s" style="color: #d14;">"RtsFlags_DebugFlags_apply"</span></span>
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