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<h3>
Ben Gamari pushed to branch wip/win32-high-heap
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/839255bc7ce4f5472144185766ad206350c14c3d">839255bc</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-11-25T11:25:13-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Allocate MBlocks with MAP_TOP_DOWN on Windows
As noted in #18991, we would previously allocate heap in low memory.
Due to this the linker, which typically *needs* low memory, would end up
competing with the heap. In longer builds we end up running out of
low memory entirely, leading to linking failures.
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<h4>1 changed file:</h4>
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<a href="#20d64c0bdc272817149d1d5cf20a73a8b5fd637f">
rts/win32/OSMem.c
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<h4>Changes:</h4>
<li id="20d64c0bdc272817149d1d5cf20a73a8b5fd637f">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/839255bc7ce4f5472144185766ad206350c14c3d#20d64c0bdc272817149d1d5cf20a73a8b5fd637f"><strong>rts/win32/OSMem.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">@@ -50,8 +50,11 @@ allocNew(uint32_t n) {</td>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="c"> <span class="n" style="color: #333;">alloc_rec</span><span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">rec</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="c"> <span class="n" style="color: #333;">rec</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">alloc_rec</span><span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">stgMallocBytes</span><span class="p">(</span><span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="n" style="color: #333;">alloc_rec</span><span class="p">),</span><span class="s" style="color: #d14;">"getMBlocks: allocNew"</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="c"> <span class="n" style="color: #333;">rec</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">size</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">((</span><span class="n" style="color: #333;">W_</span><span class="p">)</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">)</span><span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">MBLOCK_SIZE</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// N.B. We use MEM_TOP_DOWN here to ensure that we leave the bottom of the</span></span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// address space available for the linker and libraries, which in general</span></span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// want to live in low memory. See #18991.</span></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="c"> <span class="n" style="color: #333;">rec</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">base</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC54" class="line" lang="c"> <span class="n" style="color: #333;">VirtualAlloc</span><span class="p">(</span><span class="nb" style="color: #0086b3;">NULL</span><span class="p">,</span> <span class="n" style="color: #333;">rec</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">size</span><span class="p">,</span> <span class="n" style="color: #333;">MEM_RESERVE</span><span class="p">,</span> <span class="n" style="color: #333;">PAGE_READWRITE</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="c"> <span class="n" style="color: #333;">VirtualAlloc</span><span class="p">(</span><span class="nb" style="color: #0086b3;">NULL</span><span class="p">,</span> <span class="n" style="color: #333;">rec</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">size</span><span class="p">,</span> <span class="n" style="color: #333;">MEM_RESERVE</span><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">|</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">MEM_TOP_DOWN</span></span><span class="p">,</span> <span class="n" style="color: #333;">PAGE_READWRITE</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span><span class="p">(</span><span class="n" style="color: #333;">rec</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">base</span><span class="o" style="font-weight: 600;">==</span><span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="c"> <span class="n" style="color: #333;">stgFree</span><span class="p">((</span><span class="kt" style="color: #458; font-weight: 600;">void</span><span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">rec</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="c"> <span class="n" style="color: #333;">rec</span><span class="o" style="font-weight: 600;">=</span><span class="mi" style="color: #099;">0</span><span class="p">;</span></span>
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