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<h3>
Ben Gamari pushed to branch wip/lower-tc-tracing-cost
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/815f0124db8d2fc0517d888a1bb5f02c58118408">815f0124</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-14T01:19:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">typecheck: Avoid unnecessary tracing allocations

While ticky-profiling the typechecker I noticed that hundreds of
millions of SDocs are being allocated just in case -ddump-*-trace is
enabled. This is awful.

We avoid this by ensuring that the dump flag check is inlined into the
call site, ensuring that the tracing document needn't be allocated
unless it's actually needed.
</pre>
</li>
</ul>
<h4>1 changed file:</h4>
<ul>
<li class="file-stats">
<a href="#c6e4263ee64c68e57b7525127d98243fce38b1ea">
compiler/GHC/Tc/Utils/Monad.hs
</a>
</li>
</ul>
<h4>Changes:</h4>
<li id="c6e4263ee64c68e57b7525127d98243fce38b1ea">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/815f0124db8d2fc0517d888a1bb5f02c58118408#c6e4263ee64c68e57b7525127d98243fce38b1ea"><strong>compiler/GHC/Tc/Utils/Monad.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">@@ -490,6 +490,7 @@ unsetWOptM flag =</td>
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490
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<pre style="margin: 0;"> <span id="LC490" class="line" lang="haskell"><span class="n" style="color: #333;">whenDOptM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DumpFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcRnIf</span> <span class="n" style="color: #333;">gbl</span> <span class="n" style="color: #333;">lcl</span> <span class="nb" style="color: #0086b3;">()</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcRnIf</span> <span class="n" style="color: #333;">gbl</span> <span class="n" style="color: #333;">lcl</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC491" class="line" lang="haskell"><span class="n" style="color: #333;">whenDOptM</span> <span class="n" style="color: #333;">flag</span> <span class="n" style="color: #333;">thing_inside</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">doptM</span> <span class="n" style="color: #333;">flag</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC492" class="line" lang="haskell">                                 <span class="n" style="color: #333;">when</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;">+<span id="LC493" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE whenDOptM #-}</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [INLINE trace{Tc,Rn}]</span></span>
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<pre style="margin: 0;"> <span id="LC494" class="line" lang="haskell"></span>
</pre>
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<pre style="margin: 0;"> <span id="LC495" class="line" lang="haskell"><span class="n" style="color: #333;">whenGOptM</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">GeneralFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcRnIf</span> <span class="n" style="color: #333;">gbl</span> <span class="n" style="color: #333;">lcl</span> <span class="nb" style="color: #0086b3;">()</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcRnIf</span> <span class="n" style="color: #333;">gbl</span> <span class="n" style="color: #333;">lcl</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC496" class="line" lang="haskell"><span class="n" style="color: #333;">whenGOptM</span> <span class="n" style="color: #333;">flag</span> <span class="n" style="color: #333;">thing_inside</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">goptM</span> <span class="n" style="color: #333;">flag</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="666" 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">@@ -665,39 +666,47 @@ updTcRef ref fn = liftIO $ do { old <- readIORef ref</td>
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<pre style="margin: 0;"> <span id="LC666" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<pre style="margin: 0;"> <span id="LC667" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC668" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC669" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [INLINE trace{Tc,Rn}]</span></span>
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<pre style="margin: 0;">+<span id="LC670" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC671" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- In general we want to optimise for the case where tracing is not enabled.</span></span>
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<pre style="margin: 0;">+<span id="LC672" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- To ensure this happens, we ensure that traceTc and friends are inlined; this</span></span>
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<td class="diff-line-num new new_line" data-linenumber="673" 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">
673
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<pre style="margin: 0;">+<span id="LC673" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ensures that the allocation of the document can be pushed into the tracing</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="668" 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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<td class="diff-line-num new new_line" data-linenumber="674" 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">
674
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<pre style="margin: 0;">+<span id="LC674" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- path, keeping the non-traced path free of this extraneous work.</span></span>
</pre>
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668
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<td class="diff-line-num new_line" data-linenumber="675" 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">
675
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<pre style="margin: 0;"> <span id="LC675" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="669" 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">
669
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<td class="diff-line-num new_line" data-linenumber="676" 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">
676
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<pre style="margin: 0;"> <span id="LC676" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Typechecker trace</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="670" 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">
670
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<td class="diff-line-num new_line" data-linenumber="677" 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">
677
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<pre style="margin: 0;"> <span id="LC677" class="line" lang="haskell"><span class="n" style="color: #333;">traceTc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">String</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcRn</span> <span class="nb" style="color: #0086b3;">()</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="671" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
671
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<td class="diff-line-num new_line old" data-linenumber="678" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC671" class="line" lang="haskell"><span class="n" style="color: #333;">traceTc</span> <span class="o" style="font-weight: 600;">=</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="672" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
672
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<td class="diff-line-num new_line old" data-linenumber="678" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC672" class="line" lang="haskell">  <span class="n" style="color: #333;">labelledTraceOptTcRn</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_D_dump_tc_trace</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="673" 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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<td class="diff-line-num new new_line" data-linenumber="678" 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">
678
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<pre style="margin: 0;">+<span id="LC678" class="line" lang="haskell"><span class="n" style="color: #333;">traceTc</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">doc</span> <span class="o" style="font-weight: 600;">=</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="673" 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">
 
</td>
<td class="diff-line-num new new_line" data-linenumber="679" 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">
679
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<pre style="margin: 0;">+<span id="LC679" class="line" lang="haskell">    <span class="n" style="color: #333;">labelledTraceOptTcRn</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_D_dump_tc_trace</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">doc</span></span>
</pre>
</td>
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<td class="diff-line-num new old_line" data-linenumber="673" 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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<td class="diff-line-num new new_line" data-linenumber="680" 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">
680
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<pre style="margin: 0;">+<span id="LC680" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE traceTc #-}</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [INLINE trace{Tc,Rn}]</span></span>
</pre>
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673
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<td class="diff-line-num new_line" data-linenumber="681" 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">
681
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<pre style="margin: 0;"> <span id="LC681" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="674" 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">
674
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<td class="diff-line-num new_line" data-linenumber="682" 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">
682
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<pre style="margin: 0;"> <span id="LC682" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Renamer Trace</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="675" 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">
675
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<td class="diff-line-num new_line" data-linenumber="683" 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">
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<pre style="margin: 0;"> <span id="LC683" class="line" lang="haskell"><span class="n" style="color: #333;">traceRn</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">String</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcRn</span> <span class="nb" style="color: #0086b3;">()</span></span>
</pre>
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676
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<td class="diff-line-num new_line old" data-linenumber="684" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC676" class="line" lang="haskell"><span class="n" style="color: #333;">traceRn</span> <span class="o" style="font-weight: 600;">=</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="677" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
677
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<td class="diff-line-num new_line old" data-linenumber="684" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC677" class="line" lang="haskell">  <span class="n" style="color: #333;">labelledTraceOptTcRn</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_D_dump_rn_trace</span></span>
</pre>
</td>
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<td class="diff-line-num new old_line" data-linenumber="678" 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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<td class="diff-line-num new new_line" data-linenumber="684" 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">
684
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<pre style="margin: 0;">+<span id="LC684" class="line" lang="haskell"><span class="n" style="color: #333;">traceRn</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">doc</span> <span class="o" style="font-weight: 600;">=</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="678" 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">
 
</td>
<td class="diff-line-num new new_line" data-linenumber="685" 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">
685
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC685" class="line" lang="haskell">    <span class="n" style="color: #333;">labelledTraceOptTcRn</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_D_dump_rn_trace</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">doc</span></span>
</pre>
</td>
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<td class="diff-line-num new old_line" data-linenumber="678" 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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<td class="diff-line-num new new_line" data-linenumber="686" 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">
686
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<pre style="margin: 0;">+<span id="LC686" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE traceRn #-}</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [INLINE trace{Tc,Rn}]</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="678" 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">
678
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<td class="diff-line-num new_line" data-linenumber="687" 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">
687
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<pre style="margin: 0;"> <span id="LC687" class="line" lang="haskell"></span>
</pre>
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679
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688
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<pre style="margin: 0;"> <span id="LC688" class="line" lang="haskell"><span class="cd">-- | Trace when a certain flag is enabled. This is like `traceOptTcRn`</span></span>
</pre>
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680
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<pre style="margin: 0;"> <span id="LC689" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- but accepts a string as a label and formats the trace message uniformly.</span></span>
</pre>
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681
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<pre style="margin: 0;"> <span id="LC690" class="line" lang="haskell"><span class="n" style="color: #333;">labelledTraceOptTcRn</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DumpFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">String</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcRn</span> <span class="nb" style="color: #0086b3;">()</span></span>
</pre>
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682
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<td class="diff-line-num new_line old" data-linenumber="691" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC682" class="line" lang="haskell"><span class="n" style="color: #333;">labelledTraceOptTcRn</span> <span class="n" style="color: #333;">flag</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
</pre>
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683
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<pre style="margin: 0;">-<span id="LC683" class="line" lang="haskell">   <span class="n" style="color: #333;">traceOptTcRn</span> <span class="n" style="color: #333;">flag</span> <span class="p">(</span><span class="n" style="color: #333;">formatTraceMsg</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">doc</span><span class="p">)</span></span>
</pre>
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691
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<pre style="margin: 0;">+<span id="LC691" class="line" lang="haskell"><span class="n" style="color: #333;">labelledTraceOptTcRn</span> <span class="n" style="color: #333;">flag</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">doc</span> <span class="o" style="font-weight: 600;">=</span></span>
</pre>
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692
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<pre style="margin: 0;">+<span id="LC692" class="line" lang="haskell">  <span class="n" style="color: #333;">traceOptTcRn</span> <span class="n" style="color: #333;">flag</span> <span class="p">(</span><span class="n" style="color: #333;">formatTraceMsg</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">doc</span><span class="p">)</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC693" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE labelledTraceOptTcRn #-}</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [INLINE trace{Tc,Rn}]</span></span>
</pre>
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684
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<td class="diff-line-num new_line" data-linenumber="694" 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">
694
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<pre style="margin: 0;"> <span id="LC694" class="line" lang="haskell"></span>
</pre>
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685
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<td class="diff-line-num new_line" data-linenumber="695" 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">
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<pre style="margin: 0;"> <span id="LC695" class="line" lang="haskell"><span class="n" style="color: #333;">formatTraceMsg</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">String</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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686
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<td class="diff-line-num new_line" data-linenumber="696" 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">
696
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<pre style="margin: 0;"> <span id="LC696" class="line" lang="haskell"><span class="n" style="color: #333;">formatTraceMsg</span> <span class="n" style="color: #333;">herald</span> <span class="n" style="color: #333;">doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">herald</span><span class="p">)</span> <span class="mi" style="color: #099;">2</span> <span class="n" style="color: #333;">doc</span></span>
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<td class="diff-line-num new_line" data-linenumber="697" 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">
697
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<pre style="margin: 0;"> <span id="LC697" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num new_line old" data-linenumber="698" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC688" class="line" lang="haskell"><span class="cd">-- | Trace if the given 'DumpFlag' is set.</span></span>
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<pre style="margin: 0;"> <span id="LC698" class="line" lang="haskell"><span class="n" style="color: #333;">traceOptTcRn</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DumpFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcRn</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<td class="diff-line-num new_line" data-linenumber="699" 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">
699
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<pre style="margin: 0;"> <span id="LC699" class="line" lang="haskell"><span class="n" style="color: #333;">traceOptTcRn</span> <span class="n" style="color: #333;">flag</span> <span class="n" style="color: #333;">doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
</pre>
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691
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<td class="diff-line-num new_line old" data-linenumber="700" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC691" class="line" lang="haskell">  <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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692
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<pre style="margin: 0;">-<span id="LC692" class="line" lang="haskell">  <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">dopt</span> <span class="n" style="color: #333;">flag</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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700
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<pre style="margin: 0;">+<span id="LC700" class="line" lang="haskell">  <span class="n" style="color: #333;">whenDOptM</span> <span class="n" style="color: #333;">flag</span> <span class="o" style="font-weight: 600;">$</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="693" 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">
693
</td>
<td class="diff-line-num new_line" data-linenumber="701" 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">
701
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<pre style="margin: 0;"> <span id="LC701" class="line" lang="haskell">    <span class="n" style="color: #333;">dumpTcRn</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="p">(</span><span class="n" style="color: #333;">dumpOptionsFromFlag</span> <span class="n" style="color: #333;">flag</span><span class="p">)</span> <span class="s" style="color: #d14;">""</span> <span class="kt" style="color: #458; font-weight: 600;">FormatText</span> <span class="n" style="color: #333;">doc</span></span>
</pre>
</td>
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<td class="diff-line-num new old_line" data-linenumber="694" 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">
 
</td>
<td class="diff-line-num new new_line" data-linenumber="702" 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">
702
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC702" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE traceOptTcRn #-}</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [INLINE trace{Tc,Rn}]</span></span>
</pre>
</td>
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<td class="diff-line-num old_line" data-linenumber="694" 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">
694
</td>
<td class="diff-line-num new_line" data-linenumber="703" 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">
703
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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC703" class="line" lang="haskell"></span>
</pre>
</td>
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<td class="diff-line-num old_line" data-linenumber="695" 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">
695
</td>
<td class="diff-line-num new_line" data-linenumber="704" 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">
704
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<pre style="margin: 0;"> <span id="LC704" class="line" lang="haskell"><span class="cd">-- | Dump if the given 'DumpFlag' is set.</span></span>
</pre>
</td>
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<td class="diff-line-num old_line" data-linenumber="696" 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">
696
</td>
<td class="diff-line-num new_line" data-linenumber="705" 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">
705
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<pre style="margin: 0;"> <span id="LC705" class="line" lang="haskell"><span class="n" style="color: #333;">dumpOptTcRn</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DumpFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">String</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DumpFormat</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcRn</span> <span class="nb" style="color: #0086b3;">()</span></span>
</pre>
</td>
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<tr class="line_holder" id="" style="line-height: 1.6;">
<td class="diff-line-num old_line" data-linenumber="697" 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">
697
</td>
<td class="diff-line-num new_line" data-linenumber="706" 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">
706
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<pre style="margin: 0;"> <span id="LC706" class="line" lang="haskell"><span class="n" style="color: #333;">dumpOptTcRn</span> <span class="n" style="color: #333;">flag</span> <span class="n" style="color: #333;">title</span> <span class="n" style="color: #333;">fmt</span> <span class="n" style="color: #333;">doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
</pre>
</td>
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<tr class="line_holder old" id="" style="line-height: 1.6;">
<td class="diff-line-num old old_line" data-linenumber="698" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
698
</td>
<td class="diff-line-num new_line old" data-linenumber="707" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
</td>
<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">
<pre style="margin: 0;">-<span id="LC698" class="line" lang="haskell">  <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
</pre>
</td>
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<tr class="line_holder old" id="" style="line-height: 1.6;">
<td class="diff-line-num old old_line" data-linenumber="699" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
699
</td>
<td class="diff-line-num new_line old" data-linenumber="707" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
</td>
<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">
<pre style="margin: 0;">-<span id="LC699" class="line" lang="haskell">  <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">dopt</span> <span class="n" style="color: #333;">flag</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
</pre>
</td>
</tr>
<tr class="line_holder new" id="" style="line-height: 1.6;">
<td class="diff-line-num new old_line" data-linenumber="700" 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">
 
</td>
<td class="diff-line-num new new_line" data-linenumber="707" 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">
707
</td>
<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC707" class="line" lang="haskell">  <span class="n" style="color: #333;">whenDOptM</span> <span class="n" style="color: #333;">flag</span> <span class="o" style="font-weight: 600;">$</span></span>
</pre>
</td>
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<td class="diff-line-num old_line" data-linenumber="700" 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">
700
</td>
<td class="diff-line-num new_line" data-linenumber="708" 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">
708
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<pre style="margin: 0;"> <span id="LC708" class="line" lang="haskell">    <span class="n" style="color: #333;">dumpTcRn</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="p">(</span><span class="n" style="color: #333;">dumpOptionsFromFlag</span> <span class="n" style="color: #333;">flag</span><span class="p">)</span> <span class="n" style="color: #333;">title</span> <span class="n" style="color: #333;">fmt</span> <span class="n" style="color: #333;">doc</span></span>
</pre>
</td>
</tr>
<tr class="line_holder new" id="" style="line-height: 1.6;">
<td class="diff-line-num new old_line" data-linenumber="701" 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">
 
</td>
<td class="diff-line-num new new_line" data-linenumber="709" 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">
709
</td>
<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC709" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE dumpOptTcRn #-}</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [INLINE trace{TcRn}]</span></span>
</pre>
</td>
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<td class="diff-line-num old_line" data-linenumber="701" 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">
701
</td>
<td class="diff-line-num new_line" data-linenumber="710" 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">
710
</td>
<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC710" class="line" lang="haskell"></span>
</pre>
</td>
</tr>
<tr class="line_holder" id="" style="line-height: 1.6;">
<td class="diff-line-num old_line" data-linenumber="702" 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">
702
</td>
<td class="diff-line-num new_line" data-linenumber="711" 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">
711
</td>
<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC711" class="line" lang="haskell"><span class="cd">-- | Unconditionally dump some trace output</span></span>
</pre>
</td>
</tr>
<tr class="line_holder" id="" style="line-height: 1.6;">
<td class="diff-line-num old_line" data-linenumber="703" 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">
703
</td>
<td class="diff-line-num new_line" data-linenumber="712" 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">
712
</td>
<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC712" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
</pre>
</td>
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