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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>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2e63a0fb1bdaecc7916a3cc35dcfd2b2ef37c328">2e63a0fb</a></strong>
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<span>by David Eichmann</span>
<i>at 2020-11-10T10:28:46-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add code comments for StgInfoTable and StgStack structs
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<h4>2 changed files:</h4>
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<a href="#0ea78c0eb38d298692960f63f47248f6464a0479">
includes/rts/storage/Closures.h
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<a href="#2f870b7c76a5e24010e464cc1a1f860c0f9e0dab">
includes/rts/storage/TSO.h
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<h4>Changes:</h4>
<li id="0ea78c0eb38d298692960f63f47248f6464a0479">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2e63a0fb1bdaecc7916a3cc35dcfd2b2ef37c328#0ea78c0eb38d298692960f63f47248f6464a0479"><strong>includes/rts/storage/Closures.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">@@ -63,6 +63,11 @@ typedef struct {</td>
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<pre style="margin: 0;"> <span id="LC63" 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="LC64" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="c"><span class="k" style="font-weight: 600;">typedef</span> <span class="k" style="font-weight: 600;">struct</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// If TABLES_NEXT_TO_CODE is defined, then `info` is offset by</span></span>
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<td class="diff-line-num new new_line" data-linenumber="67" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// `sizeof(StgInfoTable)` and so points to the `code` field of the</span></span>
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<td class="diff-line-num new new_line" data-linenumber="68" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// StgInfoTable! You may want to use `get_itbl` to get the pointer to the</span></span>
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<td class="diff-line-num new new_line" data-linenumber="69" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// start of the info table. See</span></span>
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// https://gitlab.haskell.org/ghc/ghc/-/wikis/commentary/rts/storage/heap-objects#tables_next_to_code.</span></span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="c"> <span class="k" style="font-weight: 600;">const</span> <span class="n" style="color: #333;">StgInfoTable</span><span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">info</span><span class="p">;</span></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(PROFILING)</span></span>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="c"> <span class="n" style="color: #333;">StgProfHeader</span> <span class="n" style="color: #333;">prof</span><span class="p">;</span></span>
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<li id="2f870b7c76a5e24010e464cc1a1f860c0f9e0dab">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2e63a0fb1bdaecc7916a3cc35dcfd2b2ef37c328#2f870b7c76a5e24010e464cc1a1f860c0f9e0dab"><strong>includes/rts/storage/TSO.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">@@ -242,10 +242,22 @@ typedef struct StgTSO_ {</td>
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<pre style="margin: 0;"> <span id="LC242" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC243" class="line" lang="c"><span class="k" style="font-weight: 600;">typedef</span> <span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">StgStack_</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC244" class="line" lang="c"> <span class="n" style="color: #333;">StgHeader</span> <span class="n" style="color: #333;">header</span><span class="p">;</span></span>
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<pre style="margin: 0;">-<span id="LC245" class="line" lang="c"> <span class="n" style="color: #333;">StgWord32</span> <span class="n" style="color: #333;">stack_size</span><span class="p">;</span> <span class="c1" style="color: #998; font-style: italic;">// stack size in *words*</span></span>
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<pre style="margin: 0;">+<span id="LC245" class="line" lang="c"></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;">/* Size of the `stack` field in *words*. This is not affected by how much of</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;"> * the stack space is used, nor if more stack space is linked to by an</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;"> * UNDERFLOW_FRAME.</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;"> */</span></span>
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<pre style="margin: 0;">+<span id="LC250" class="line" lang="c"> <span class="n" style="color: #333;">StgWord32</span> <span class="n" style="color: #333;">stack_size</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC251" class="line" lang="c"></span>
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246
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<pre style="margin: 0;"> <span id="LC252" class="line" lang="c"> <span class="n" style="color: #333;">StgWord8</span> <span class="n" style="color: #333;">dirty</span><span class="p">;</span> <span class="c1" style="color: #998; font-style: italic;">// non-zero => dirty</span></span>
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247
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<pre style="margin: 0;"> <span id="LC253" class="line" lang="c"> <span class="n" style="color: #333;">StgWord8</span> <span class="n" style="color: #333;">marking</span><span class="p">;</span> <span class="c1" style="color: #998; font-style: italic;">// non-zero => someone is currently marking the stack</span></span>
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248
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<pre style="margin: 0;">-<span id="LC248" class="line" lang="c"> <span class="n" style="color: #333;">StgPtr</span> <span class="n" style="color: #333;">sp</span><span class="p">;</span> <span class="c1" style="color: #998; font-style: italic;">// current stack pointer</span></span>
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<pre style="margin: 0;">+<span id="LC254" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC255" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* Pointer to the "top" of the stack i.e. the most recently written address.</span></span>
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<pre style="margin: 0;">+<span id="LC256" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * The stack is filled downwards, so the "top" of the stack starts with `sp</span></span>
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<pre style="margin: 0;">+<span id="LC257" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * = stack + stack_size` and is decremented as the stack fills with data.</span></span>
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<pre style="margin: 0;">+<span id="LC258" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * See comment on "Invariants" below.</span></span>
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<pre style="margin: 0;">+<span id="LC259" 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="LC260" class="line" lang="c"> <span class="n" style="color: #333;">StgPtr</span> <span class="n" style="color: #333;">sp</span><span class="p">;</span></span>
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249
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<pre style="margin: 0;"> <span id="LC261" class="line" lang="c"> <span class="n" style="color: #333;">StgWord</span> <span class="n" style="color: #333;">stack</span><span class="p">[];</span></span>
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<pre style="margin: 0;"> <span id="LC262" class="line" lang="c"><span class="p">}</span> <span class="n" style="color: #333;">StgStack</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC263" class="line" lang="c"></span>
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