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<h3>
Sven Tennie pushed to branch wip/ghc-debug
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/120f1190738d9a678a56c5b3a0b7c96c12637f72">120f1190</a></strong>
<div>
<span>by Sven Tennie</span>
<i>at 2020-06-06T13:26:39+02:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add/update documentation for FindPtrCb
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</li>
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<h4>1 changed file:</h4>
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<li class="file-stats">
<a href="#1f366bc5cc9fea123d6a6ab6c25b1483994867d5">
rts/Printer.c
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<h4>Changes:</h4>
<li id="1f366bc5cc9fea123d6a6ab6c25b1483994867d5">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/120f1190738d9a678a56c5b3a0b7c96c12637f72#1f366bc5cc9fea123d6a6ab6c25b1483994867d5"><strong>rts/Printer.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">@@ -852,10 +852,12 @@ extern void DEBUG_LoadSymbols( const char *name STG_UNUSED )</td>
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<pre style="margin: 0;"> <span id="LC853" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#endif </span><span class="cm" style="color: #998; font-style: italic;">/* USING_LIBBFD */</span></span>
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<pre style="margin: 0;">-<span id="LC855" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// findPtr takes a callback so external tools such as ghc-debug can invoke it</span></span>
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<pre style="margin: 0;">-<span id="LC856" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// and intercept the intermediate results. When findPtr successfully finds</span></span>
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<pre style="margin: 0;">-<span id="LC857" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// a closure containing an address then the callback is called on the address</span></span>
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<pre style="margin: 0;">-<span id="LC858" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// of that closure. The `StgClosure` argument is an untagged closure pointer.</span></span>
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<pre style="margin: 0;">+<span id="LC855" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// findPtrCb takes a callback of type FindPtrCb, so external tools (such as</span></span>
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<pre style="margin: 0;">+<span id="LC856" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// ghc-debug) can invoke it and intercept the intermediate results.</span></span>
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<pre style="margin: 0;">+<span id="LC857" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// When findPtrCb successfully finds a closure containing an address then the</span></span>
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<pre style="margin: 0;">+<span id="LC858" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// callback is called on the address of that closure.</span></span>
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<pre style="margin: 0;">+<span id="LC859" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// The `StgClosure` argument is an untagged closure pointer.</span></span>
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<pre style="margin: 0;">+<span id="LC860" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// `user` points to any data provided by the caller. It's not used internally.</span></span>
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<pre style="margin: 0;"> <span id="LC861" class="line" lang="c"><span class="k" style="font-weight: 600;">typedef</span> <span class="nf" style="color: #900; font-weight: 600;">void</span> <span class="p">(</span><span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">FindPtrCb</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="n" style="color: #333;">user</span><span class="p">,</span> <span class="n" style="color: #333;">StgClosure</span> <span class="o" style="font-weight: 600;">*</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC863" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">findPtr</span><span class="p">(</span><span class="n" style="color: #333;">P_</span> <span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">int</span><span class="p">);</span>                <span class="cm" style="color: #998; font-style: italic;">/* keep gcc -Wall happy */</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">@@ -949,11 +951,14 @@ findPtr_gen(FindPtrCb cb, void *user, P_ p, int follow)</td>
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<pre style="margin: 0;"> <span id="LC951" class="line" lang="c">  <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC952" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC953" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC952" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span></span>
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<pre style="margin: 0;">-<span id="LC953" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">findPtr</span><span class="p">(</span><span class="n" style="color: #333;">P_</span> <span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="n" style="color: #333;">follow</span><span class="p">){</span></span>
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<pre style="margin: 0;">+<span id="LC954" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Special case of findPtrCb: Uses a default callback, that prints the closure</span></span>
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<pre style="margin: 0;">+<span id="LC955" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// pointed to by p.</span></span>
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<pre style="margin: 0;">+<span id="LC956" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">findPtr</span><span class="p">(</span><span class="n" style="color: #333;">P_</span> <span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="n" style="color: #333;">follow</span><span class="p">){</span></span>
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<pre style="margin: 0;"> <span id="LC957" class="line" lang="c">  <span class="n" style="color: #333;">findPtr_gen</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">findPtr_default_callback</span><span class="p">,</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">,</span> <span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="n" style="color: #333;">follow</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC958" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC959" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC960" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// Call cb on the closure pointed to by p.</span></span>
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<pre style="margin: 0;">+<span id="LC961" class="line" lang="c"><span class="c1" style="color: #998; font-style: italic;">// FindPtrCb is documented where it's defined.</span></span>
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<pre style="margin: 0;"> <span id="LC962" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">findPtrCb</span><span class="p">(</span><span class="n" style="color: #333;">FindPtrCb</span> <span class="n" style="color: #333;">cb</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="n" style="color: #333;">user</span><span class="p">,</span> <span class="n" style="color: #333;">P_</span> <span class="n" style="color: #333;">p</span><span class="p">){</span></span>
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<pre style="margin: 0;"> <span id="LC963" class="line" lang="c">  <span class="n" style="color: #333;">findPtr_gen</span><span class="p">(</span><span class="n" style="color: #333;">cb</span><span class="p">,</span> <span class="n" style="color: #333;">user</span><span class="p">,</span> <span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC964" class="line" lang="c"><span class="p">}</span></span>
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