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<h3>
Marge Bot pushed to branch master
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/fd984d68e5ec4b04bc79395c099434e653eb1060">fd984d68</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-10-09T08:41:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: fix race condition in StgCRun
On windows the stack has to be allocated 4k at a time, otherwise we get
a segfault. This is done by using a helper ___chkstk_ms that is provided
by libgcc. The Haskell side already knows how to handle this but we need
to do the same from STG. Previously we would drop the stack in StgRun
but would only make it valid whenever the scheduler loop ran.
This approach was fundamentally broken in that it falls apart when you
take a signal from the OS. We see it less often because you initially
get allocated a 1MB stack block which you have to blow past first.
Concretely this means we must always keep the stack valid.
Fixes #18601.
</pre>
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<h4>6 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#7b360ca84c1b9aaecc0f9de207a7698dc36514fe">
compiler/GHC/CmmToAsm/X86/Instr.hs
</a>
</li>
<li class="file-stats">
<a href="#9ed11d0519762dae04656481b089dbb5b05acf98">
rts/RtsStartup.c
</a>
</li>
<li class="file-stats">
<a href="#16c842a51a135c8ef2c7c7f94336544868348a3c">
rts/RtsSymbols.c
</a>
</li>
<li class="file-stats">
<a href="#7d6961cb073b9fe3df3a81f0ad5cf36eed293c42">
rts/Schedule.c
</a>
</li>
<li class="file-stats">
<a href="#58538d5291ee4e1bbdcd28de5ef291880c691d06">
rts/StgCRun.c
</a>
</li>
<li class="file-stats">
<a href="#318431ac8e075c11d63e82817a83669f2c5f4b48">
rts/StgRun.h
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</li>
</ul>
<h4>Changes:</h4>
<li id="7b360ca84c1b9aaecc0f9de207a7698dc36514fe">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fd984d68e5ec4b04bc79395c099434e653eb1060#7b360ca84c1b9aaecc0f9de207a7698dc36514fe"><strong>compiler/GHC/CmmToAsm/X86/Instr.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="832" 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">@@ -832,13 +832,14 @@ mkJumpInstr id</td>
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832
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832
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<pre style="margin: 0;"> <span id="LC832" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- In essence each allocation larger than a page size needs to be chunked and</span></span>
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<td class="diff-line-num old_line" data-linenumber="833" 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">
833
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<td class="diff-line-num new_line" data-linenumber="833" 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">
833
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<pre style="margin: 0;"> <span id="LC833" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a probe emitted after each page allocation. You have to hit the guard</span></span>
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834
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834
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<pre style="margin: 0;"> <span id="LC834" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- page so the kernel can map in the next page, otherwise you'll segfault.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="835" 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">
835
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<pre style="margin: 0;">+<span id="LC835" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Windows stack allocations].</span></span>
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835
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<td class="diff-line-num new_line" data-linenumber="836" 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">
836
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<pre style="margin: 0;"> <span id="LC836" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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836
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837
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<pre style="margin: 0;"> <span id="LC837" class="line" lang="haskell"><span class="n" style="color: #333;">needs_probe_call</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Platform</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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837
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<td class="diff-line-num new_line" data-linenumber="838" 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">
838
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<pre style="margin: 0;"> <span id="LC838" class="line" lang="haskell"><span class="n" style="color: #333;">needs_probe_call</span> <span class="n" style="color: #333;">platform</span> <span class="n" style="color: #333;">amount</span></span>
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838
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<td class="diff-line-num new_line" data-linenumber="839" 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">
839
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<pre style="margin: 0;"> <span id="LC839" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">platformOS</span> <span class="n" style="color: #333;">platform</span> <span class="kr" style="font-weight: 600;">of</span></span>
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839
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840
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<pre style="margin: 0;"> <span id="LC840" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">OSMinGW32</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">platformArch</span> <span class="n" style="color: #333;">platform</span> <span class="kr" style="font-weight: 600;">of</span></span>
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840
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841
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<pre style="margin: 0;"> <span id="LC841" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ArchX86</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">amount</span> <span class="o" style="font-weight: 600;">></span> <span class="p">(</span><span class="mi" style="color: #099;">4</span> <span class="o" style="font-weight: 600;">*</span> <span class="mi" style="color: #099;">1024</span><span class="p">)</span></span>
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841
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<pre style="margin: 0;">-<span id="LC841" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ArchX86_64</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">amount</span> <span class="o" style="font-weight: 600;">></span> <span class="p">(</span><span class="mi" style="color: #099;"><span class="idiff left right">8</span></span> <span class="o" style="font-weight: 600;">*</span> <span class="mi" style="color: #099;">1024</span><span class="p">)</span></span>
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842
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<pre style="margin: 0;">+<span id="LC842" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ArchX86_64</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">amount</span> <span class="o" style="font-weight: 600;">></span> <span class="p">(</span><span class="mi" style="color: #099;"><span class="idiff left right">4</span></span> <span class="o" style="font-weight: 600;">*</span> <span class="mi" style="color: #099;">1024</span><span class="p">)</span></span>
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842
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843
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<pre style="margin: 0;"> <span id="LC843" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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843
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844
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<pre style="margin: 0;"> <span id="LC844" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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845
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<pre style="margin: 0;"> <span id="LC845" class="line" lang="haskell"></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">@@ -862,7 +863,7 @@ mkStackAllocInstr platform amount</td>
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862
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863
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<pre style="margin: 0;"> <span id="LC863" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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863
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864
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<pre style="margin: 0;"> <span id="LC864" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We emit a call because the stack probes are quite involved and</span></span>
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<pre style="margin: 0;"> <span id="LC865" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- would bloat code size a lot. GHC doesn't really have an -Os.</span></span>
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<pre style="margin: 0;">-<span id="LC865" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- __chkstk is guaranteed to leave all nonvolatile registers and AX</span></span>
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<pre style="margin: 0;">+<span id="LC866" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- __<span class="idiff left right">_</span>chkstk is guaranteed to leave all nonvolatile registers and AX</span></span>
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<pre style="margin: 0;"> <span id="LC867" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- untouched. It's part of the standard prologue code for any Windows</span></span>
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868
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<pre style="margin: 0;"> <span id="LC868" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- function dropping the stack more than a page.</span></span>
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<pre style="margin: 0;"> <span id="LC869" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Windows stack layout]</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fd984d68e5ec4b04bc79395c099434e653eb1060#9ed11d0519762dae04656481b089dbb5b05acf98"><strong>rts/RtsStartup.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">@@ -71,7 +71,7 @@ static bool rts_shutdown = false;</td>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(mingw32_HOST_OS)</span></span>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/* Indicates CodePage to set program to after exit. */</span></span>
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<pre style="margin: 0;">-<span id="LC74" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">int64_t</span> <span class="n" style="color: #333;">__codePage</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;"><span class="idiff left right">0</span></span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">int64_t</span> <span class="n" style="color: #333;">__codePage</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;"><span class="idiff left">-</span></span><span class="mi" style="color: #099;"><span class="idiff right">1</span></span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC75" 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="LC76" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">flushStdHandles</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="p">);</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fd984d68e5ec4b04bc79395c099434e653eb1060#16c842a51a135c8ef2c7c7f94336544868348a3c"><strong>rts/RtsSymbols.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">@@ -135,7 +135,7 @@</td>
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> SymI_HasProto(rts_InstallConsoleEvent) \</span></span>
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> SymI_HasProto(rts_ConsoleHandlerDone) \</span></span>
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<pre style="margin: 0;"> <span id="LC137" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> SymI_HasProto(atexit) \</span></span>
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<pre style="margin: 0;">-<span id="LC138" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> RTS_WIN32_ONLY(SymI_NeedsProto(__<span class="idiff left right">chkstk_ms)) </span> \</span></span>
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<pre style="margin: 0;">+<span id="LC138" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> RTS_WIN32_ONLY(SymI_NeedsProto(__<span class="idiff left right">_chkstk_ms))</span> \</span></span>
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139
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<pre style="margin: 0;"> <span id="LC139" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> RTS_WIN64_ONLY(SymI_NeedsProto(___chkstk_ms)) \</span></span>
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> RTS_WIN32_ONLY(SymI_HasProto(_imp___environ)) \</span></span>
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<pre style="margin: 0;"> <span id="LC141" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;"> RTS_WIN64_ONLY(SymI_HasProto(__imp__environ)) \</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fd984d68e5ec4b04bc79395c099434e653eb1060#7d6961cb073b9fe3df3a81f0ad5cf36eed293c42"><strong>rts/Schedule.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">@@ -137,7 +137,6 @@ static Capability *schedule (Capability *initialCapability, Task *task);</td>
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<pre style="margin: 0;"> <span id="LC137" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// abstracted only to make the structure and control flow of the</span></span>
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<pre style="margin: 0;"> <span id="LC138" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// scheduler clearer.</span></span>
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<pre style="margin: 0;"> <span id="LC139" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">//</span></span>
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<pre style="margin: 0;">-<span id="LC140" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">schedulePreLoop</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">scheduleFindWork</span> <span class="p">(</span><span class="n" style="color: #333;">Capability</span> <span class="o" style="font-weight: 600;">**</span><span class="n" style="color: #333;">pcap</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC141" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(THREADED_RTS)</span></span>
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<pre style="margin: 0;"> <span id="LC142" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">scheduleYield</span> <span class="p">(</span><span class="n" style="color: #333;">Capability</span> <span class="o" style="font-weight: 600;">**</span><span class="n" style="color: #333;">pcap</span><span class="p">,</span> <span class="n" style="color: #333;">Task</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">task</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">@@ -207,8 +206,6 @@ schedule (Capability *initialCapability, Task *task)</td>
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<pre style="margin: 0;"> <span id="LC206" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC207" class="line" lang="c"> <span class="n" style="color: #333;">debugTrace</span> <span class="p">(</span><span class="n" style="color: #333;">DEBUG_sched</span><span class="p">,</span> <span class="s" style="color: #d14;">"cap %d: schedule()"</span><span class="p">,</span> <span class="n" style="color: #333;">initialCapability</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">no</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC208" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC210" class="line" lang="c"> <span class="n" style="color: #333;">schedulePreLoop</span><span class="p">();</span></span>
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<pre style="margin: 0;">-<span id="LC211" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC209" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// -----------------------------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC210" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Scheduler loop starts here:</span></span>
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<pre style="margin: 0;"> <span id="LC211" class="line" lang="c"></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">@@ -613,20 +610,6 @@ promoteInRunQueue (Capability *cap, StgTSO *tso)</td>
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<pre style="margin: 0;"> <span id="LC610" class="line" lang="c"> <span class="n" style="color: #333;">pushOnRunQueue</span><span class="p">(</span><span class="n" style="color: #333;">cap</span><span class="p">,</span> <span class="n" style="color: #333;">tso</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC611" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC612" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC616" 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="LC617" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Setting up the scheduler loop</span></span>
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<pre style="margin: 0;">-<span id="LC618" 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="LC619" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC620" 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="LC621" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">schedulePreLoop</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC622" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC623" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// initialisation for scheduler - what cannot go into initScheduler()</span></span>
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<pre style="margin: 0;">-<span id="LC624" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC625" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(mingw32_HOST_OS) && !defined(USE_MINIINTERPRETER)</span></span>
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<pre style="margin: 0;">-<span id="LC626" class="line" lang="c"> <span class="n" style="color: #333;">win32AllocStack</span><span class="p">();</span></span>
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<pre style="margin: 0;">-<span id="LC627" 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="LC628" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC629" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC613" 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="LC614" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * scheduleFindWork()</span></span>
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<pre style="margin: 0;"> <span id="LC615" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<li id="58538d5291ee4e1bbdcd28de5ef291880c691d06">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fd984d68e5ec4b04bc79395c099434e653eb1060#58538d5291ee4e1bbdcd28de5ef291880c691d06"><strong>rts/StgCRun.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">@@ -96,25 +96,6 @@ StgFunPtr StgReturn(void)</td>
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<pre style="margin: 0;"> <span id="LC96" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC97" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC98" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#else </span><span class="cm" style="color: #998; font-style: italic;">/* !USE_MINIINTERPRETER */</span></span>
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<pre style="margin: 0;">-<span id="LC99" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC100" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(mingw32_HOST_OS)</span></span>
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101
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<pre style="margin: 0;">-<span id="LC101" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/*</span></span>
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102
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<pre style="margin: 0;">-<span id="LC102" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Note [Windows Stack allocations]</span></span>
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103
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<pre style="margin: 0;">-<span id="LC103" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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104
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<pre style="margin: 0;">-<span id="LC104" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * On windows the stack has to be allocated 4k at a time, otherwise</span></span>
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<pre style="margin: 0;">-<span id="LC105" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * we get a segfault. The C compiler knows how to do this (it calls</span></span>
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<pre style="margin: 0;">-<span id="LC106" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * _alloca()), so we make sure that we can allocate as much stack as</span></span>
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<pre style="margin: 0;">-<span id="LC107" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * we need. However since we are doing a local stack allocation and the value</span></span>
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<pre style="margin: 0;">-<span id="LC108" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * isn't valid outside the frame, compilers are free to optimize this allocation</span></span>
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<pre style="margin: 0;">-<span id="LC109" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * and the corresponding stack check away. So to prevent that we request that</span></span>
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<pre style="margin: 0;">-<span id="LC110" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * this function never be optimized (See #14669). */</span></span>
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<pre style="margin: 0;">-<span id="LC111" class="line" lang="c"><span class="n" style="color: #333;">STG_NO_OPTIMIZE</span> <span class="n" style="color: #333;">StgWord8</span> <span class="o" style="font-weight: 600;">*</span><span class="nf" style="color: #900; font-weight: 600;">win32AllocStack</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC112" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;">-<span id="LC113" class="line" lang="c"> <span class="n" style="color: #333;">StgWord8</span> <span class="n" style="color: #333;">stack</span><span class="p">[</span><span class="n" style="color: #333;">RESERVED_C_STACK_BYTES</span> <span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #099;">16</span> <span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #099;">12</span><span class="p">];</span></span>
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<pre style="margin: 0;">-<span id="LC114" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">stack</span><span class="p">;</span></span>
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<pre style="margin: 0;">-<span id="LC115" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC116" 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="LC117" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC99" 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="LC100" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> x86 architecture</span></span>
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<pre style="margin: 0;"> <span id="LC101" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> -------------------------------------------------------------------------- */</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">@@ -166,7 +147,21 @@ STG_NO_OPTIMIZE StgWord8 *win32AllocStack(void)</td>
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166
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<pre style="margin: 0;"> <span id="LC147" 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="LC148" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * If you edit the sequence below be sure to update the unwinding information</span></span>
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<pre style="margin: 0;"> <span id="LC149" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * for stg_stop_thread in StgStartup.cmm.</span></span>
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<pre style="margin: 0;">-<span id="LC169" 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="LC150" 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="LC151" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Note [Windows Stack allocations]</span></span>
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<pre style="margin: 0;">+<span id="LC152" 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="LC153" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * On windows the stack has to be allocated 4k at a time, otherwise</span></span>
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154
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<pre style="margin: 0;">+<span id="LC154" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * we get a segfault. This is done by using a helper ___chkstk_ms that is</span></span>
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155
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * provided by libgcc. The Haskell side already knows how to handle this</span></span>
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156
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">(see GHC.CmmToAsm.X86.Instr.needs_probe_call)</span></span>
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157
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * but we need to do the same from STG. Previously we would drop the stack</span></span>
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158
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * in StgRun but would only make it valid whenever the scheduler loop ran.</span></span>
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159
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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160
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<pre style="margin: 0;">+<span id="LC160" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * This approach was fundamentally broken in that it falls apart when you</span></span>
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161
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<pre style="margin: 0;">+<span id="LC161" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * take a signal from the OS (See #14669, #18601, #18548 and #18496).</span></span>
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162
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<pre style="margin: 0;">+<span id="LC162" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Concretely this means we must always keep the stack valid.</span></span>
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163
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<pre style="margin: 0;">+<span id="LC163" 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="LC164" class="line" lang="c"></span>
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165
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<pre style="margin: 0;"> <span id="LC165" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC166" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">GNUC3_ATTRIBUTE</span><span class="p">(</span><span class="n" style="color: #333;">used</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="c"><span class="n" style="color: #333;">StgRunIsImplementedInAssembler</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</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">@@ -186,7 +181,13 @@ StgRunIsImplementedInAssembler(void)</td>
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<pre style="margin: 0;"> <span id="LC181" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * bytes from here - this is a requirement of the C ABI, so</span></span>
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<pre style="margin: 0;"> <span id="LC182" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * that C code can assign SSE2 registers directly to/from</span></span>
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<pre style="margin: 0;"> <span id="LC183" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * stack locations.</span></span>
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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185
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<pre style="margin: 0;">+<span id="LC185" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * See Note [Windows Stack allocations]</span></span>
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189
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186
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<pre style="margin: 0;"> <span id="LC186" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> */</span></span>
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187
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<pre style="margin: 0;">+<span id="LC187" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(mingw32_HOST_OS)</span></span>
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188
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<pre style="margin: 0;">+<span id="LC188" class="line" lang="c"> <span class="s" style="color: #d14;">"movl %0, %%eax</span><span class="se" style="color: #d14;">\n\t</span><span class="s" style="color: #d14;">"</span></span>
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<pre style="margin: 0;">+<span id="LC189" class="line" lang="c"> <span class="s" style="color: #d14;">"call ___chkstk_ms</span><span class="se" style="color: #d14;">\n\t</span><span class="s" style="color: #d14;">"</span></span>
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<pre style="margin: 0;">+<span id="LC190" 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="LC191" class="line" lang="c"> <span class="s" style="color: #d14;">"subl %0, %%esp</span><span class="se" style="color: #d14;">\n\t</span><span class="s" style="color: #d14;">"</span></span>
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<pre style="margin: 0;"> <span id="LC192" class="line" lang="c"></span>
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193
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<pre style="margin: 0;"> <span id="LC193" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/*</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">@@ -383,6 +384,14 @@ StgRunIsImplementedInAssembler(void)</td>
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<pre style="margin: 0;"> <span id="LC384" class="line" lang="c"> <span class="n" style="color: #333;">STG_HIDDEN</span> <span class="n" style="color: #333;">STG_RUN</span> <span class="s" style="color: #d14;">"</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span></span>
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385
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<pre style="margin: 0;"> <span id="LC385" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span>
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385
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<pre style="margin: 0;"> <span id="LC386" class="line" lang="c"> <span class="n" style="color: #333;">STG_RUN</span> <span class="s" style="color: #d14;">":</span><span class="se" style="color: #d14;">\n\t</span><span class="s" style="color: #d14;">"</span></span>
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<pre style="margin: 0;">+<span id="LC387" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/*</span></span>
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388
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<pre style="margin: 0;">+<span id="LC388" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * See Note [Windows Stack allocations]</span></span>
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389
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<pre style="margin: 0;">+<span id="LC389" 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="LC390" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(mingw32_HOST_OS)</span></span>
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<pre style="margin: 0;">+<span id="LC391" class="line" lang="c"> <span class="s" style="color: #d14;">"movq %1, %%rax</span><span class="se" style="color: #d14;">\n\t</span><span class="s" style="color: #d14;">"</span></span>
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<pre style="margin: 0;">+<span id="LC392" class="line" lang="c"> <span class="s" style="color: #d14;">"addq %0, %%rax</span><span class="se" style="color: #d14;">\n\t</span><span class="s" style="color: #d14;">"</span></span>
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<pre style="margin: 0;">+<span id="LC393" class="line" lang="c"> <span class="s" style="color: #d14;">"callq ___chkstk_ms</span><span class="se" style="color: #d14;">\n\t</span><span class="s" style="color: #d14;">"</span></span>
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<pre style="margin: 0;">+<span id="LC394" 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="LC395" class="line" lang="c"> <span class="s" style="color: #d14;">"subq %1, %%rsp</span><span class="se" style="color: #d14;">\n\t</span><span class="s" style="color: #d14;">"</span></span>
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<pre style="margin: 0;"> <span id="LC396" class="line" lang="c"> <span class="s" style="color: #d14;">"movq %%rsp, %%rax</span><span class="se" style="color: #d14;">\n\t</span><span class="s" style="color: #d14;">"</span></span>
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<pre style="margin: 0;"> <span id="LC397" class="line" lang="c"> <span class="s" style="color: #d14;">"subq %0, %%rsp</span><span class="se" style="color: #d14;">\n\t</span><span class="s" style="color: #d14;">"</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fd984d68e5ec4b04bc79395c099434e653eb1060#318431ac8e075c11d63e82817a83669f2c5f4b48"><strong>rts/StgRun.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">@@ -9,7 +9,3 @@</td>
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9
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#pragma once</span></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="c"><span class="n" style="color: #333;">RTS_PRIVATE</span> <span class="n" style="color: #333;">StgRegTable</span> <span class="o" style="font-weight: 600;">*</span> <span class="nf" style="color: #900; font-weight: 600;">StgRun</span> <span class="p">(</span><span class="n" style="color: #333;">StgFunPtr</span> <span class="n" style="color: #333;">f</span><span class="p">,</span> <span class="n" style="color: #333;">StgRegTable</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">basereg</span><span class="p">);</span></span></pre>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#if defined(mingw32_HOST_OS)</span></span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="c"><span class="n" style="color: #333;">StgWord8</span> <span class="o" style="font-weight: 600;">*</span><span class="nf" style="color: #900; font-weight: 600;">win32AllocStack</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="p">);</span></span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif</span></span></pre>
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