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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>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/815f0124db8d2fc0517d888a1bb5f02c58118408">815f0124</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-04-14T01:19:21-04:00</i>
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<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.
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<h4>1 changed file:</h4>
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<a href="#c6e4263ee64c68e57b7525127d98243fce38b1ea">
compiler/GHC/Tc/Utils/Monad.hs
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<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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<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>
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492
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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>
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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="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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<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>
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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>
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<pre style="margin: 0;"> <span id="LC675" class="line" lang="haskell"></span>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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<pre style="margin: 0;"> <span id="LC681" class="line" lang="haskell"></span>
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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>
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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>
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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>
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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>
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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>
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<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>
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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>
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<pre style="margin: 0;"> <span id="LC687" class="line" lang="haskell"></span>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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<pre style="margin: 0;"> <span id="LC694" class="line" lang="haskell"></span>
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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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<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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<pre style="margin: 0;"> <span id="LC697" class="line" lang="haskell"></span>
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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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<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>
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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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<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;">$</span></span>
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<pre style="margin: 0;">+<span id="LC700" class="line" lang="haskell"> <span class="n" style="color: #333;">whenDOptM</span> <span class="n" style="color: #333;">flag</span> <span class="o" style="font-weight: 600;">$</span></span>
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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>
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<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>
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<pre style="margin: 0;"> <span id="LC703" class="line" lang="haskell"></span>
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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>
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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>
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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>
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<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>
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<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;">$</span></span>
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<pre style="margin: 0;">+<span id="LC707" class="line" lang="haskell"> <span class="n" style="color: #333;">whenDOptM</span> <span class="n" style="color: #333;">flag</span> <span class="o" style="font-weight: 600;">$</span></span>
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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>
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<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>
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<pre style="margin: 0;"> <span id="LC710" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC711" class="line" lang="haskell"><span class="cd">-- | Unconditionally dump some trace output</span></span>
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<pre style="margin: 0;"> <span id="LC712" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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