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<title>simplStg/SRT.lhs</title>
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%
% (c) The GRASP/AQUA Project, Glasgow University, 1998
%
Run through the STG code and compute the Static Reference Table for
each let-binding. At the same time, we figure out which top-level
bindings have no CAF references, and record the fact in their IdInfo.
\begin{code}
<pre><a name="line-1"></a><span class='hs-comment'>{-# OPTIONS -fno-warn-incomplete-patterns #-}</span>
<a name="line-2"></a><span class='hs-comment'>-- The above warning supression flag is a temporary kludge.</span>
<a name="line-3"></a><span class='hs-comment'>-- While working on this module you are encouraged to remove it and fix</span>
<a name="line-4"></a><span class='hs-comment'>-- any warnings in the module. See</span>
<a name="line-5"></a><span class='hs-comment'>-- <a href="http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings">http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings</a></span>
<a name="line-6"></a><span class='hs-comment'>-- for details</span>
<a name="line-7"></a>
<a name="line-8"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>SRT</span><span class='hs-layout'>(</span> <span class='hs-varid'>computeSRTs</span> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-9"></a>
<a name="line-10"></a><span class='hs-cpp'>#include "HsVersions.h"</span>
<a name="line-11"></a>
<a name="line-12"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>StgSyn</span>
<a name="line-13"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Id</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Id</span> <span class='hs-layout'>)</span>
<a name="line-14"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>VarSet</span>
<a name="line-15"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>VarEnv</span>
<a name="line-16"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Maybes</span> <span class='hs-layout'>(</span> <span class='hs-varid'>orElse</span><span class='hs-layout'>,</span> <span class='hs-varid'>expectJust</span> <span class='hs-layout'>)</span>
<a name="line-17"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Bitmap</span>
<a name="line-18"></a>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Outputable</span>
<a name="line-20"></a>
<a name="line-21"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Util</span>
</pre>\end{code}
\begin{code}
<pre><a name="line-1"></a><a name="computeSRTs"></a><span class='hs-definition'>computeSRTs</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>StgBinding</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>StgBinding</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Id</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>Id</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-2"></a> <span class='hs-comment'>-- The incoming bindingd are filled with SRTEntries in their SRT slots</span>
<a name="line-3"></a> <span class='hs-comment'>-- the outgoing ones have NoSRT/SRT values instead</span>
<a name="line-4"></a>
<a name="line-5"></a><span class='hs-definition'>computeSRTs</span> <span class='hs-varid'>binds</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>srtTopBinds</span> <span class='hs-varid'>emptyVarEnv</span> <span class='hs-varid'>binds</span>
<a name="line-6"></a>
<a name="line-7"></a><span class='hs-comment'>-- --------------------------------------------------------------------------</span>
<a name="line-8"></a><span class='hs-comment'>-- Top-level Bindings</span>
<a name="line-9"></a>
<a name="line-10"></a><a name="srtTopBinds"></a><span class='hs-definition'>srtTopBinds</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IdEnv</span> <span class='hs-conid'>Id</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>StgBinding</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>StgBinding</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Id</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>Id</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-11"></a>
<a name="line-12"></a><span class='hs-definition'>srtTopBinds</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-13"></a><span class='hs-definition'>srtTopBinds</span> <span class='hs-varid'>env</span> <span class='hs-layout'>(</span><span class='hs-conid'>StgNonRec</span> <span class='hs-varid'>b</span> <span class='hs-varid'>rhs</span> <span class='hs-conop'>:</span> <span class='hs-varid'>binds</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-14"></a> <span class='hs-layout'>(</span><span class='hs-conid'>StgNonRec</span> <span class='hs-varid'>b</span> <span class='hs-varid'>rhs'</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>b</span><span class='hs-layout'>,</span><span class='hs-varid'>srt'</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-conop'>:</span> <span class='hs-varid'>srtTopBinds</span> <span class='hs-varid'>env'</span> <span class='hs-varid'>binds</span>
<a name="line-15"></a> <span class='hs-keyword'>where</span>
<a name="line-16"></a> <span class='hs-layout'>(</span><span class='hs-varid'>rhs'</span><span class='hs-layout'>,</span> <span class='hs-varid'>srt</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>srtTopRhs</span> <span class='hs-varid'>b</span> <span class='hs-varid'>rhs</span>
<a name="line-17"></a> <span class='hs-varid'>env'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybeExtendEnv</span> <span class='hs-varid'>env</span> <span class='hs-varid'>b</span> <span class='hs-varid'>rhs</span>
<a name="line-18"></a> <span class='hs-varid'>srt'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>applyEnvList</span> <span class='hs-varid'>env</span> <span class='hs-varid'>srt</span>
<a name="line-19"></a><span class='hs-definition'>srtTopBinds</span> <span class='hs-varid'>env</span> <span class='hs-layout'>(</span><span class='hs-conid'>StgRec</span> <span class='hs-varid'>bs</span> <span class='hs-conop'>:</span> <span class='hs-varid'>binds</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-20"></a> <span class='hs-layout'>(</span><span class='hs-conid'>StgRec</span> <span class='hs-layout'>(</span><span class='hs-varid'>zip</span> <span class='hs-varid'>bndrs</span> <span class='hs-varid'>rhss</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>zip</span> <span class='hs-varid'>bndrs</span> <span class='hs-varid'>srts'</span><span class='hs-layout'>)</span> <span class='hs-conop'>:</span> <span class='hs-varid'>srtTopBinds</span> <span class='hs-varid'>env</span> <span class='hs-varid'>binds</span>
<a name="line-21"></a> <span class='hs-keyword'>where</span>
<a name="line-22"></a> <span class='hs-layout'>(</span><span class='hs-varid'>rhss</span><span class='hs-layout'>,</span> <span class='hs-varid'>srts</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unzip</span> <span class='hs-keyglyph'>[</span> <span class='hs-varid'>srtTopRhs</span> <span class='hs-varid'>b</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span><span class='hs-layout'>,</span><span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>bs</span> <span class='hs-keyglyph'>]</span>
<a name="line-23"></a> <span class='hs-varid'>bndrs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-varid'>fst</span> <span class='hs-varid'>bs</span>
<a name="line-24"></a> <span class='hs-varid'>srts'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>applyEnvList</span> <span class='hs-varid'>env</span><span class='hs-layout'>)</span> <span class='hs-varid'>srts</span>
<a name="line-25"></a>
<a name="line-26"></a><span class='hs-comment'>-- Shorting out indirections in SRTs: if a binding has an SRT with a single</span>
<a name="line-27"></a><span class='hs-comment'>-- element in it, we just inline it with that element everywhere it occurs</span>
<a name="line-28"></a><span class='hs-comment'>-- in other SRTs.</span>
<a name="line-29"></a><span class='hs-comment'>--</span>
<a name="line-30"></a><span class='hs-comment'>-- This is in a way a generalisation of the CafInfo. CafInfo says</span>
<a name="line-31"></a><span class='hs-comment'>-- whether a top-level binding has *zero* CAF references, allowing us</span>
<a name="line-32"></a><span class='hs-comment'>-- to omit it from SRTs. Here, we pick up bindings with *one* CAF</span>
<a name="line-33"></a><span class='hs-comment'>-- reference, and inline its SRT everywhere it occurs. We could pass</span>
<a name="line-34"></a><span class='hs-comment'>-- this information across module boundaries too, but we currently</span>
<a name="line-35"></a><span class='hs-comment'>-- don't.</span>
<a name="line-36"></a>
<a name="line-37"></a><a name="maybeExtendEnv"></a><span class='hs-definition'>maybeExtendEnv</span> <span class='hs-keyglyph'>::</span><span class='hs-conid'>IdEnv</span> <span class='hs-conid'>Id</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Id</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StgRhs</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IdEnv</span> <span class='hs-conid'>Id</span>
<a name="line-38"></a><span class='hs-definition'>maybeExtendEnv</span> <span class='hs-varid'>env</span> <span class='hs-varid'>bndr</span> <span class='hs-layout'>(</span><span class='hs-conid'>StgRhsClosure</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>ReEntrant</span> <span class='hs-layout'>(</span><span class='hs-conid'>SRTEntries</span> <span class='hs-varid'>cafs</span><span class='hs-layout'>)</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span>
<a name="line-39"></a> <span class='hs-keyglyph'>|</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>one</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>varSetElems</span> <span class='hs-varid'>cafs</span>
<a name="line-40"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>extendVarEnv</span> <span class='hs-varid'>env</span> <span class='hs-varid'>bndr</span> <span class='hs-layout'>(</span><span class='hs-varid'>applyEnv</span> <span class='hs-varid'>env</span> <span class='hs-varid'>one</span><span class='hs-layout'>)</span>
<a name="line-41"></a><span class='hs-definition'>maybeExtendEnv</span> <span class='hs-varid'>env</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>env</span>
<a name="line-42"></a>
<a name="line-43"></a><a name="applyEnvList"></a><span class='hs-definition'>applyEnvList</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IdEnv</span> <span class='hs-conid'>Id</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Id</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Id</span><span class='hs-keyglyph'>]</span>
<a name="line-44"></a><span class='hs-definition'>applyEnvList</span> <span class='hs-varid'>env</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>applyEnv</span> <span class='hs-varid'>env</span><span class='hs-layout'>)</span>
<a name="line-45"></a>
<a name="line-46"></a><a name="applyEnv"></a><span class='hs-definition'>applyEnv</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IdEnv</span> <span class='hs-conid'>Id</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Id</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Id</span>
<a name="line-47"></a><span class='hs-definition'>applyEnv</span> <span class='hs-varid'>env</span> <span class='hs-varid'>id</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lookupVarEnv</span> <span class='hs-varid'>env</span> <span class='hs-varid'>id</span> <span class='hs-varop'>`orElse`</span> <span class='hs-varid'>id</span>
<a name="line-48"></a>
<a name="line-49"></a><span class='hs-comment'>-- ---- Top-level right hand sides:</span>
<a name="line-50"></a>
<a name="line-51"></a><a name="srtTopRhs"></a><span class='hs-definition'>srtTopRhs</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Id</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StgRhs</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>StgRhs</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Id</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-52"></a>
<a name="line-53"></a><span class='hs-definition'>srtTopRhs</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>rhs</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>StgRhsCon</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>rhs</span><span class='hs-layout'>,</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-54"></a><span class='hs-definition'>srtTopRhs</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>rhs</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>StgRhsClosure</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-layout'>(</span><span class='hs-conid'>SRTEntries</span> <span class='hs-varid'>cafs</span><span class='hs-layout'>)</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span>
<a name="line-55"></a> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>srtRhs</span> <span class='hs-varid'>table</span> <span class='hs-varid'>rhs</span><span class='hs-layout'>,</span> <span class='hs-varid'>elems</span><span class='hs-layout'>)</span>
<a name="line-56"></a> <span class='hs-keyword'>where</span>
<a name="line-57"></a> <span class='hs-varid'>elems</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>varSetElems</span> <span class='hs-varid'>cafs</span>
<a name="line-58"></a> <span class='hs-varid'>table</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkVarEnv</span> <span class='hs-layout'>(</span><span class='hs-varid'>zip</span> <span class='hs-varid'>elems</span> <span class='hs-keyglyph'>[</span><span class='hs-num'>0</span><span class='hs-keyglyph'>..</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-59"></a>
<a name="line-60"></a><span class='hs-comment'>-- ---- Binds:</span>
<a name="line-61"></a>
<a name="line-62"></a><a name="srtBind"></a><span class='hs-definition'>srtBind</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IdEnv</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StgBinding</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StgBinding</span>
<a name="line-63"></a>
<a name="line-64"></a><span class='hs-definition'>srtBind</span> <span class='hs-varid'>table</span> <span class='hs-layout'>(</span><span class='hs-conid'>StgNonRec</span> <span class='hs-varid'>binder</span> <span class='hs-varid'>rhs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StgNonRec</span> <span class='hs-varid'>binder</span> <span class='hs-layout'>(</span><span class='hs-varid'>srtRhs</span> <span class='hs-varid'>table</span> <span class='hs-varid'>rhs</span><span class='hs-layout'>)</span>
<a name="line-65"></a><span class='hs-definition'>srtBind</span> <span class='hs-varid'>table</span> <span class='hs-layout'>(</span><span class='hs-conid'>StgRec</span> <span class='hs-varid'>pairs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StgRec</span> <span class='hs-keyglyph'>[</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>srtRhs</span> <span class='hs-varid'>table</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span><span class='hs-layout'>,</span><span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>pairs</span> <span class='hs-keyglyph'>]</span>
<a name="line-66"></a>
<a name="line-67"></a><span class='hs-comment'>-- ---- Right Hand Sides:</span>
<a name="line-68"></a>
<a name="line-69"></a><a name="srtRhs"></a><span class='hs-definition'>srtRhs</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IdEnv</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StgRhs</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StgRhs</span>
<a name="line-70"></a>
<a name="line-71"></a><span class='hs-definition'>srtRhs</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>e</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>StgRhsCon</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>e</span>
<a name="line-72"></a><span class='hs-definition'>srtRhs</span> <span class='hs-varid'>table</span> <span class='hs-layout'>(</span><span class='hs-conid'>StgRhsClosure</span> <span class='hs-varid'>cc</span> <span class='hs-varid'>bi</span> <span class='hs-varid'>free_vars</span> <span class='hs-varid'>u</span> <span class='hs-varid'>srt</span> <span class='hs-varid'>args</span> <span class='hs-varid'>body</span><span class='hs-layout'>)</span>
<a name="line-73"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StgRhsClosure</span> <span class='hs-varid'>cc</span> <span class='hs-varid'>bi</span> <span class='hs-varid'>free_vars</span> <span class='hs-varid'>u</span> <span class='hs-layout'>(</span><span class='hs-varid'>constructSRT</span> <span class='hs-varid'>table</span> <span class='hs-varid'>srt</span><span class='hs-layout'>)</span> <span class='hs-varid'>args</span>
<a name="line-74"></a> <span class='hs-varop'>$!</span> <span class='hs-layout'>(</span><span class='hs-varid'>srtExpr</span> <span class='hs-varid'>table</span> <span class='hs-varid'>body</span><span class='hs-layout'>)</span>
<a name="line-75"></a>
<a name="line-76"></a><span class='hs-comment'>-- ---------------------------------------------------------------------------</span>
<a name="line-77"></a><span class='hs-comment'>-- Expressions</span>
<a name="line-78"></a>
<a name="line-79"></a><a name="srtExpr"></a><span class='hs-definition'>srtExpr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IdEnv</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StgExpr</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StgExpr</span>
<a name="line-80"></a>
<a name="line-81"></a><span class='hs-definition'>srtExpr</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>e</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>StgApp</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>e</span>
<a name="line-82"></a><span class='hs-definition'>srtExpr</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>e</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>StgLit</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>e</span>
<a name="line-83"></a><span class='hs-definition'>srtExpr</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>e</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>StgConApp</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>e</span>
<a name="line-84"></a><span class='hs-definition'>srtExpr</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>e</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>StgOpApp</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>e</span>
<a name="line-85"></a>
<a name="line-86"></a><span class='hs-definition'>srtExpr</span> <span class='hs-varid'>table</span> <span class='hs-layout'>(</span><span class='hs-conid'>StgSCC</span> <span class='hs-varid'>cc</span> <span class='hs-varid'>expr</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StgSCC</span> <span class='hs-varid'>cc</span> <span class='hs-varop'>$!</span> <span class='hs-varid'>srtExpr</span> <span class='hs-varid'>table</span> <span class='hs-varid'>expr</span>
<a name="line-87"></a>
<a name="line-88"></a><span class='hs-definition'>srtExpr</span> <span class='hs-varid'>table</span> <span class='hs-layout'>(</span><span class='hs-conid'>StgTick</span> <span class='hs-varid'>m</span> <span class='hs-varid'>n</span> <span class='hs-varid'>expr</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StgTick</span> <span class='hs-varid'>m</span> <span class='hs-varid'>n</span> <span class='hs-varop'>$!</span> <span class='hs-varid'>srtExpr</span> <span class='hs-varid'>table</span> <span class='hs-varid'>expr</span>
<a name="line-89"></a>
<a name="line-90"></a><span class='hs-definition'>srtExpr</span> <span class='hs-varid'>table</span> <span class='hs-layout'>(</span><span class='hs-conid'>StgCase</span> <span class='hs-varid'>scrut</span> <span class='hs-varid'>live1</span> <span class='hs-varid'>live2</span> <span class='hs-varid'>uniq</span> <span class='hs-varid'>srt</span> <span class='hs-varid'>alt_type</span> <span class='hs-varid'>alts</span><span class='hs-layout'>)</span>
<a name="line-91"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StgCase</span> <span class='hs-varid'>expr'</span> <span class='hs-varid'>live1</span> <span class='hs-varid'>live2</span> <span class='hs-varid'>uniq</span> <span class='hs-varid'>srt'</span> <span class='hs-varid'>alt_type</span> <span class='hs-varid'>alts'</span>
<a name="line-92"></a> <span class='hs-keyword'>where</span>
<a name="line-93"></a> <span class='hs-varid'>expr'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>srtExpr</span> <span class='hs-varid'>table</span> <span class='hs-varid'>scrut</span>
<a name="line-94"></a> <span class='hs-varid'>srt'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>constructSRT</span> <span class='hs-varid'>table</span> <span class='hs-varid'>srt</span>
<a name="line-95"></a> <span class='hs-varid'>alts'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>srtAlt</span> <span class='hs-varid'>table</span><span class='hs-layout'>)</span> <span class='hs-varid'>alts</span>
<a name="line-96"></a>
<a name="line-97"></a><span class='hs-definition'>srtExpr</span> <span class='hs-varid'>table</span> <span class='hs-layout'>(</span><span class='hs-conid'>StgLet</span> <span class='hs-varid'>bind</span> <span class='hs-varid'>body</span><span class='hs-layout'>)</span>
<a name="line-98"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>srtBind</span> <span class='hs-varid'>table</span> <span class='hs-varid'>bind</span> <span class='hs-varop'>=:</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>bind'</span> <span class='hs-keyglyph'>-></span>
<a name="line-99"></a> <span class='hs-varid'>srtExpr</span> <span class='hs-varid'>table</span> <span class='hs-varid'>body</span> <span class='hs-varop'>=:</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>body'</span> <span class='hs-keyglyph'>-></span>
<a name="line-100"></a> <span class='hs-conid'>StgLet</span> <span class='hs-varid'>bind'</span> <span class='hs-varid'>body'</span>
<a name="line-101"></a>
<a name="line-102"></a><span class='hs-definition'>srtExpr</span> <span class='hs-varid'>table</span> <span class='hs-layout'>(</span><span class='hs-conid'>StgLetNoEscape</span> <span class='hs-varid'>live1</span> <span class='hs-varid'>live2</span> <span class='hs-varid'>bind</span> <span class='hs-varid'>body</span><span class='hs-layout'>)</span>
<a name="line-103"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>srtBind</span> <span class='hs-varid'>table</span> <span class='hs-varid'>bind</span> <span class='hs-varop'>=:</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>bind'</span> <span class='hs-keyglyph'>-></span>
<a name="line-104"></a> <span class='hs-varid'>srtExpr</span> <span class='hs-varid'>table</span> <span class='hs-varid'>body</span> <span class='hs-varop'>=:</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>body'</span> <span class='hs-keyglyph'>-></span>
<a name="line-105"></a> <span class='hs-conid'>StgLetNoEscape</span> <span class='hs-varid'>live1</span> <span class='hs-varid'>live2</span> <span class='hs-varid'>bind'</span> <span class='hs-varid'>body'</span>
<a name="line-106"></a>
<a name="line-107"></a><span class='hs-definition'>srtExpr</span> <span class='hs-sel'>_table</span> <span class='hs-varid'>expr</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>pprPanic</span> <span class='hs-str'>"srtExpr"</span> <span class='hs-layout'>(</span><span class='hs-varid'>ppr</span> <span class='hs-varid'>expr</span><span class='hs-layout'>)</span>
<a name="line-108"></a>
<a name="line-109"></a><a name="srtAlt"></a><span class='hs-definition'>srtAlt</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IdEnv</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StgAlt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StgAlt</span>
<a name="line-110"></a><span class='hs-definition'>srtAlt</span> <span class='hs-varid'>table</span> <span class='hs-layout'>(</span><span class='hs-varid'>con</span><span class='hs-layout'>,</span><span class='hs-varid'>args</span><span class='hs-layout'>,</span><span class='hs-varid'>used</span><span class='hs-layout'>,</span><span class='hs-varid'>rhs</span><span class='hs-layout'>)</span>
<a name="line-111"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>(,,,)</span> <span class='hs-varid'>con</span> <span class='hs-varid'>args</span> <span class='hs-varid'>used</span> <span class='hs-varop'>$!</span> <span class='hs-varid'>srtExpr</span> <span class='hs-varid'>table</span> <span class='hs-varid'>rhs</span>
<a name="line-112"></a>
<a name="line-113"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-114"></a><span class='hs-comment'>-- Construct an SRT bitmap.</span>
<a name="line-115"></a>
<a name="line-116"></a><a name="constructSRT"></a><span class='hs-definition'>constructSRT</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IdEnv</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SRT</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SRT</span>
<a name="line-117"></a><span class='hs-definition'>constructSRT</span> <span class='hs-varid'>table</span> <span class='hs-layout'>(</span><span class='hs-conid'>SRTEntries</span> <span class='hs-varid'>entries</span><span class='hs-layout'>)</span>
<a name="line-118"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isEmptyVarSet</span> <span class='hs-varid'>entries</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>NoSRT</span>
<a name="line-119"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>seqBitmap</span> <span class='hs-varid'>bitmap</span> <span class='hs-varop'>$</span> <span class='hs-conid'>SRT</span> <span class='hs-varid'>offset</span> <span class='hs-varid'>len</span> <span class='hs-varid'>bitmap</span>
<a name="line-120"></a> <span class='hs-keyword'>where</span>
<a name="line-121"></a> <span class='hs-varid'>ints</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>expectJust</span> <span class='hs-str'>"constructSRT"</span> <span class='hs-varop'>.</span> <span class='hs-varid'>lookupVarEnv</span> <span class='hs-varid'>table</span><span class='hs-layout'>)</span>
<a name="line-122"></a> <span class='hs-layout'>(</span><span class='hs-varid'>varSetElems</span> <span class='hs-varid'>entries</span><span class='hs-layout'>)</span>
<a name="line-123"></a> <span class='hs-varid'>sorted_ints</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sortLe</span> <span class='hs-layout'>(</span><span class='hs-varop'><=</span><span class='hs-layout'>)</span> <span class='hs-varid'>ints</span>
<a name="line-124"></a> <span class='hs-varid'>offset</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>head</span> <span class='hs-varid'>sorted_ints</span>
<a name="line-125"></a> <span class='hs-varid'>bitmap_entries</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>subtract</span> <span class='hs-varid'>offset</span><span class='hs-layout'>)</span> <span class='hs-varid'>sorted_ints</span>
<a name="line-126"></a> <span class='hs-varid'>len</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>last</span> <span class='hs-varid'>bitmap_entries</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span>
<a name="line-127"></a> <span class='hs-varid'>bitmap</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>intsToBitmap</span> <span class='hs-varid'>len</span> <span class='hs-varid'>bitmap_entries</span>
<a name="line-128"></a>
<a name="line-129"></a><span class='hs-comment'>-- ---------------------------------------------------------------------------</span>
<a name="line-130"></a><span class='hs-comment'>-- Misc stuff</span>
<a name="line-131"></a>
<a name="line-132"></a><a name="=:"></a><span class='hs-layout'>(</span><span class='hs-varop'>=:</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span>
<a name="line-133"></a><a name="a"></a><span class='hs-definition'>a</span> <span class='hs-varop'>=:</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>k</span> <span class='hs-varid'>a</span>
<a name="line-134"></a>
</pre>\end{code}
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