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%
% (c) The University of Glasgow 2006
% (c) The AQUA Project, Glasgow University, 1996-1998
%
This module contains "tidying" code for *nested* expressions, bindings, rules.
The code for *top-level* bindings is in TidyPgm.
\begin{code}
<pre><a name="line-1"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>CoreTidy</span> <span class='hs-layout'>(</span>
<a name="line-2"></a> <span class='hs-varid'>tidyExpr</span><span class='hs-layout'>,</span> <span class='hs-varid'>tidyVarOcc</span><span class='hs-layout'>,</span> <span class='hs-varid'>tidyRule</span><span class='hs-layout'>,</span> <span class='hs-varid'>tidyRules</span>
<a name="line-3"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-4"></a>
<a name="line-5"></a><span class='hs-cpp'>#include "HsVersions.h"</span>
<a name="line-6"></a>
<a name="line-7"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>CoreSyn</span>
<a name="line-8"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>CoreArity</span>
<a name="line-9"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Id</span>
<a name="line-10"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>IdInfo</span>
<a name="line-11"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Type</span>
<a name="line-12"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Var</span>
<a name="line-13"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>VarEnv</span>
<a name="line-14"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>UniqFM</span>
<a name="line-15"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Name</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>tidyNameOcc</span><span class='hs-layout'>)</span>
<a name="line-16"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>SrcLoc</span>
<a name="line-17"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Maybes</span>
<a name="line-18"></a>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span>
</pre>\end{code}
%************************************************************************
%* *
\subsection{Tidying expressions, rules}
%* *
%************************************************************************
\begin{code}
<pre><a name="line-1"></a><a name="tidyBind"></a><span class='hs-definition'>tidyBind</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TidyEnv</span>
<a name="line-2"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CoreBind</span>
<a name="line-3"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>TidyEnv</span><span class='hs-layout'>,</span> <span class='hs-conid'>CoreBind</span><span class='hs-layout'>)</span>
<a name="line-4"></a>
<a name="line-5"></a><span class='hs-definition'>tidyBind</span> <span class='hs-varid'>env</span> <span class='hs-layout'>(</span><span class='hs-conid'>NonRec</span> <span class='hs-varid'>bndr</span> <span class='hs-varid'>rhs</span><span class='hs-layout'>)</span>
<a name="line-6"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tidyLetBndr</span> <span class='hs-varid'>env</span> <span class='hs-layout'>(</span><span class='hs-varid'>bndr</span><span class='hs-layout'>,</span><span class='hs-varid'>rhs</span><span class='hs-layout'>)</span> <span class='hs-varop'>=:</span> <span class='hs-keyglyph'>\</span> <span class='hs-layout'>(</span><span class='hs-varid'>env'</span><span class='hs-layout'>,</span> <span class='hs-varid'>bndr'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-7"></a> <span class='hs-layout'>(</span><span class='hs-varid'>env'</span><span class='hs-layout'>,</span> <span class='hs-conid'>NonRec</span> <span class='hs-varid'>bndr'</span> <span class='hs-layout'>(</span><span class='hs-varid'>tidyExpr</span> <span class='hs-varid'>env'</span> <span class='hs-varid'>rhs</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-8"></a>
<a name="line-9"></a><span class='hs-definition'>tidyBind</span> <span class='hs-varid'>env</span> <span class='hs-layout'>(</span><span class='hs-conid'>Rec</span> <span class='hs-varid'>prs</span><span class='hs-layout'>)</span>
<a name="line-10"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mapAccumL</span> <span class='hs-varid'>tidyLetBndr</span> <span class='hs-varid'>env</span> <span class='hs-varid'>prs</span> <span class='hs-varop'>=:</span> <span class='hs-keyglyph'>\</span> <span class='hs-layout'>(</span><span class='hs-varid'>env'</span><span class='hs-layout'>,</span> <span class='hs-varid'>bndrs'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-11"></a> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>tidyExpr</span> <span class='hs-varid'>env'</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>snd</span> <span class='hs-varid'>prs</span><span class='hs-layout'>)</span> <span class='hs-varop'>=:</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>rhss'</span> <span class='hs-keyglyph'>-></span>
<a name="line-12"></a> <span class='hs-layout'>(</span><span class='hs-varid'>env'</span><span class='hs-layout'>,</span> <span class='hs-conid'>Rec</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>
<a name="line-13"></a>
<a name="line-14"></a>
<a name="line-15"></a><a name="tidyExpr"></a><span class='hs-comment'>------------ Expressions --------------</span>
<a name="line-16"></a><span class='hs-definition'>tidyExpr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TidyEnv</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CoreExpr</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CoreExpr</span>
<a name="line-17"></a><span class='hs-definition'>tidyExpr</span> <span class='hs-varid'>env</span> <span class='hs-layout'>(</span><span class='hs-conid'>Var</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Var</span> <span class='hs-layout'>(</span><span class='hs-varid'>tidyVarOcc</span> <span class='hs-varid'>env</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span>
<a name="line-18"></a><span class='hs-definition'>tidyExpr</span> <span class='hs-varid'>env</span> <span class='hs-layout'>(</span><span class='hs-conid'>Type</span> <span class='hs-varid'>ty</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Type</span> <span class='hs-layout'>(</span><span class='hs-varid'>tidyType</span> <span class='hs-varid'>env</span> <span class='hs-varid'>ty</span><span class='hs-layout'>)</span>
<a name="line-19"></a><span class='hs-definition'>tidyExpr</span> <span class='hs-keyword'>_</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lit</span> <span class='hs-varid'>lit</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lit</span> <span class='hs-varid'>lit</span>
<a name="line-20"></a><span class='hs-definition'>tidyExpr</span> <span class='hs-varid'>env</span> <span class='hs-layout'>(</span><span class='hs-conid'>App</span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>App</span> <span class='hs-layout'>(</span><span class='hs-varid'>tidyExpr</span> <span class='hs-varid'>env</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>tidyExpr</span> <span class='hs-varid'>env</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-21"></a><span class='hs-definition'>tidyExpr</span> <span class='hs-varid'>env</span> <span class='hs-layout'>(</span><span class='hs-conid'>Note</span> <span class='hs-varid'>n</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Note</span> <span class='hs-layout'>(</span><span class='hs-varid'>tidyNote</span> <span class='hs-varid'>env</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>tidyExpr</span> <span class='hs-varid'>env</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-22"></a><span class='hs-definition'>tidyExpr</span> <span class='hs-varid'>env</span> <span class='hs-layout'>(</span><span class='hs-conid'>Cast</span> <span class='hs-varid'>e</span> <span class='hs-varid'>co</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Cast</span> <span class='hs-layout'>(</span><span class='hs-varid'>tidyExpr</span> <span class='hs-varid'>env</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>tidyType</span> <span class='hs-varid'>env</span> <span class='hs-varid'>co</span><span class='hs-layout'>)</span>
<a name="line-23"></a>
<a name="line-24"></a><span class='hs-definition'>tidyExpr</span> <span class='hs-varid'>env</span> <span class='hs-layout'>(</span><span class='hs-conid'>Let</span> <span class='hs-varid'>b</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-25"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tidyBind</span> <span class='hs-varid'>env</span> <span class='hs-varid'>b</span> <span class='hs-varop'>=:</span> <span class='hs-keyglyph'>\</span> <span class='hs-layout'>(</span><span class='hs-varid'>env'</span><span class='hs-layout'>,</span> <span class='hs-varid'>b'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-26"></a> <span class='hs-conid'>Let</span> <span class='hs-varid'>b'</span> <span class='hs-layout'>(</span><span class='hs-varid'>tidyExpr</span> <span class='hs-varid'>env'</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-27"></a>
<a name="line-28"></a><span class='hs-definition'>tidyExpr</span> <span class='hs-varid'>env</span> <span class='hs-layout'>(</span><span class='hs-conid'>Case</span> <span class='hs-varid'>e</span> <span class='hs-varid'>b</span> <span class='hs-varid'>ty</span> <span class='hs-varid'>alts</span><span class='hs-layout'>)</span>
<a name="line-29"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tidyBndr</span> <span class='hs-varid'>env</span> <span class='hs-varid'>b</span> <span class='hs-varop'>=:</span> <span class='hs-keyglyph'>\</span> <span class='hs-layout'>(</span><span class='hs-varid'>env'</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-30"></a> <span class='hs-conid'>Case</span> <span class='hs-layout'>(</span><span class='hs-varid'>tidyExpr</span> <span class='hs-varid'>env</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span> <span class='hs-varid'>b</span> <span class='hs-layout'>(</span><span class='hs-varid'>tidyType</span> <span class='hs-varid'>env</span> <span class='hs-varid'>ty</span><span class='hs-layout'>)</span>
<a name="line-31"></a> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>tidyAlt</span> <span class='hs-varid'>b</span> <span class='hs-varid'>env'</span><span class='hs-layout'>)</span> <span class='hs-varid'>alts</span><span class='hs-layout'>)</span>
<a name="line-32"></a>
<a name="line-33"></a><span class='hs-definition'>tidyExpr</span> <span class='hs-varid'>env</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lam</span> <span class='hs-varid'>b</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-34"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tidyBndr</span> <span class='hs-varid'>env</span> <span class='hs-varid'>b</span> <span class='hs-varop'>=:</span> <span class='hs-keyglyph'>\</span> <span class='hs-layout'>(</span><span class='hs-varid'>env'</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-35"></a> <span class='hs-conid'>Lam</span> <span class='hs-varid'>b</span> <span class='hs-layout'>(</span><span class='hs-varid'>tidyExpr</span> <span class='hs-varid'>env'</span> <span class='hs-varid'>e</span><span class='hs-layout'>)</span>
<a name="line-36"></a>
<a name="line-37"></a><a name="tidyAlt"></a><span class='hs-comment'>------------ Case alternatives --------------</span>
<a name="line-38"></a><span class='hs-definition'>tidyAlt</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CoreBndr</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TidyEnv</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CoreAlt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CoreAlt</span>
<a name="line-39"></a><span class='hs-definition'>tidyAlt</span> <span class='hs-sel'>_case_bndr</span> <span class='hs-varid'>env</span> <span class='hs-layout'>(</span><span class='hs-varid'>con</span><span class='hs-layout'>,</span> <span class='hs-varid'>vs</span><span class='hs-layout'>,</span> <span class='hs-varid'>rhs</span><span class='hs-layout'>)</span>
<a name="line-40"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tidyBndrs</span> <span class='hs-varid'>env</span> <span class='hs-varid'>vs</span> <span class='hs-varop'>=:</span> <span class='hs-keyglyph'>\</span> <span class='hs-layout'>(</span><span class='hs-varid'>env'</span><span class='hs-layout'>,</span> <span class='hs-varid'>vs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-41"></a> <span class='hs-layout'>(</span><span class='hs-varid'>con</span><span class='hs-layout'>,</span> <span class='hs-varid'>vs</span><span class='hs-layout'>,</span> <span class='hs-varid'>tidyExpr</span> <span class='hs-varid'>env'</span> <span class='hs-varid'>rhs</span><span class='hs-layout'>)</span>
<a name="line-42"></a>
<a name="line-43"></a><a name="tidyNote"></a><span class='hs-comment'>------------ Notes --------------</span>
<a name="line-44"></a><span class='hs-definition'>tidyNote</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TidyEnv</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Note</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Note</span>
<a name="line-45"></a><span class='hs-definition'>tidyNote</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>note</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>note</span>
<a name="line-46"></a>
<a name="line-47"></a><a name="tidyRules"></a><span class='hs-comment'>------------ Rules --------------</span>
<a name="line-48"></a><span class='hs-definition'>tidyRules</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TidyEnv</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>CoreRule</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>CoreRule</span><span class='hs-keyglyph'>]</span>
<a name="line-49"></a><span class='hs-definition'>tidyRules</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-50"></a><span class='hs-definition'>tidyRules</span> <span class='hs-varid'>env</span> <span class='hs-layout'>(</span><span class='hs-varid'>rule</span> <span class='hs-conop'>:</span> <span class='hs-varid'>rules</span><span class='hs-layout'>)</span>
<a name="line-51"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tidyRule</span> <span class='hs-varid'>env</span> <span class='hs-varid'>rule</span> <span class='hs-varop'>=:</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>rule</span> <span class='hs-keyglyph'>-></span>
<a name="line-52"></a> <span class='hs-varid'>tidyRules</span> <span class='hs-varid'>env</span> <span class='hs-varid'>rules</span> <span class='hs-varop'>=:</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>rules</span> <span class='hs-keyglyph'>-></span>
<a name="line-53"></a> <span class='hs-layout'>(</span><span class='hs-varid'>rule</span> <span class='hs-conop'>:</span> <span class='hs-varid'>rules</span><span class='hs-layout'>)</span>
<a name="line-54"></a>
<a name="line-55"></a><a name="tidyRule"></a><span class='hs-definition'>tidyRule</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TidyEnv</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CoreRule</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CoreRule</span>
<a name="line-56"></a><span class='hs-definition'>tidyRule</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>rule</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>BuiltinRule</span> <span class='hs-layout'>{</span><span class='hs-layout'>}</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>rule</span>
<a name="line-57"></a><span class='hs-definition'>tidyRule</span> <span class='hs-varid'>env</span> <span class='hs-varid'>rule</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Rule</span> <span class='hs-layout'>{</span> <span class='hs-varid'>ru_bndrs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>bndrs</span><span class='hs-layout'>,</span> <span class='hs-varid'>ru_args</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>args</span><span class='hs-layout'>,</span> <span class='hs-varid'>ru_rhs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>rhs</span><span class='hs-layout'>,</span>
<a name="line-58"></a> <span class='hs-varid'>ru_fn</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fn</span><span class='hs-layout'>,</span> <span class='hs-varid'>ru_rough</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mb_ns</span> <span class='hs-layout'>}</span><span class='hs-layout'>)</span>
<a name="line-59"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tidyBndrs</span> <span class='hs-varid'>env</span> <span class='hs-varid'>bndrs</span> <span class='hs-varop'>=:</span> <span class='hs-keyglyph'>\</span> <span class='hs-layout'>(</span><span class='hs-varid'>env'</span><span class='hs-layout'>,</span> <span class='hs-varid'>bndrs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-60"></a> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>tidyExpr</span> <span class='hs-varid'>env'</span><span class='hs-layout'>)</span> <span class='hs-varid'>args</span> <span class='hs-varop'>=:</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>args</span> <span class='hs-keyglyph'>-></span>
<a name="line-61"></a> <span class='hs-varid'>rule</span> <span class='hs-layout'>{</span> <span class='hs-varid'>ru_bndrs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>bndrs</span><span class='hs-layout'>,</span> <span class='hs-varid'>ru_args</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>args</span><span class='hs-layout'>,</span>
<a name="line-62"></a> <span class='hs-varid'>ru_rhs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tidyExpr</span> <span class='hs-varid'>env'</span> <span class='hs-varid'>rhs</span><span class='hs-layout'>,</span>
<a name="line-63"></a> <span class='hs-varid'>ru_fn</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tidyNameOcc</span> <span class='hs-varid'>env</span> <span class='hs-varid'>fn</span><span class='hs-layout'>,</span>
<a name="line-64"></a> <span class='hs-varid'>ru_rough</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-varid'>tidyNameOcc</span> <span class='hs-varid'>env'</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>mb_ns</span> <span class='hs-layout'>}</span>
</pre>\end{code}
%************************************************************************
%* *
\subsection{Tidying non-top-level binders}
%* *
%************************************************************************
\begin{code}
<pre><a name="line-1"></a><a name="tidyNameOcc"></a><span class='hs-definition'>tidyNameOcc</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TidyEnv</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Name</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Name</span>
<a name="line-2"></a><span class='hs-comment'>-- In rules and instances, we have Names, and we must tidy them too</span>
<a name="line-3"></a><span class='hs-comment'>-- Fortunately, we can lookup in the VarEnv with a name</span>
<a name="line-4"></a><span class='hs-definition'>tidyNameOcc</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>var_env</span><span class='hs-layout'>)</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>lookupUFM</span> <span class='hs-varid'>var_env</span> <span class='hs-varid'>n</span> <span class='hs-keyword'>of</span>
<a name="line-5"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>n</span>
<a name="line-6"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>idName</span> <span class='hs-varid'>v</span>
<a name="line-7"></a>
<a name="line-8"></a><a name="tidyVarOcc"></a><span class='hs-definition'>tidyVarOcc</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TidyEnv</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Var</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Var</span>
<a name="line-9"></a><span class='hs-definition'>tidyVarOcc</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>var_env</span><span class='hs-layout'>)</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lookupVarEnv</span> <span class='hs-varid'>var_env</span> <span class='hs-varid'>v</span> <span class='hs-varop'>`orElse`</span> <span class='hs-varid'>v</span>
<a name="line-10"></a>
<a name="line-11"></a><a name="tidyBndr"></a><span class='hs-comment'>-- tidyBndr is used for lambda and case binders</span>
<a name="line-12"></a><span class='hs-definition'>tidyBndr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TidyEnv</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Var</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>TidyEnv</span><span class='hs-layout'>,</span> <span class='hs-conid'>Var</span><span class='hs-layout'>)</span>
<a name="line-13"></a><span class='hs-definition'>tidyBndr</span> <span class='hs-varid'>env</span> <span class='hs-varid'>var</span>
<a name="line-14"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isTyVar</span> <span class='hs-varid'>var</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tidyTyVarBndr</span> <span class='hs-varid'>env</span> <span class='hs-varid'>var</span>
<a name="line-15"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tidyIdBndr</span> <span class='hs-varid'>env</span> <span class='hs-varid'>var</span>
<a name="line-16"></a>
<a name="line-17"></a><a name="tidyBndrs"></a><span class='hs-definition'>tidyBndrs</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TidyEnv</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Var</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>TidyEnv</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Var</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-18"></a><span class='hs-definition'>tidyBndrs</span> <span class='hs-varid'>env</span> <span class='hs-varid'>vars</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mapAccumL</span> <span class='hs-varid'>tidyBndr</span> <span class='hs-varid'>env</span> <span class='hs-varid'>vars</span>
<a name="line-19"></a>
<a name="line-20"></a><a name="tidyLetBndr"></a><span class='hs-definition'>tidyLetBndr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TidyEnv</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-conid'>CoreExpr</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>TidyEnv</span><span class='hs-layout'>,</span> <span class='hs-conid'>Var</span><span class='hs-layout'>)</span>
<a name="line-21"></a><span class='hs-comment'>-- Used for local (non-top-level) let(rec)s</span>
<a name="line-22"></a><span class='hs-definition'>tidyLetBndr</span> <span class='hs-varid'>env</span> <span class='hs-layout'>(</span><span class='hs-varid'>id</span><span class='hs-layout'>,</span><span class='hs-varid'>rhs</span><span class='hs-layout'>)</span>
<a name="line-23"></a> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>tidy_env</span><span class='hs-layout'>,</span><span class='hs-varid'>new_var_env</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>final_id</span><span class='hs-layout'>)</span>
<a name="line-24"></a> <span class='hs-keyword'>where</span>
<a name="line-25"></a> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>tidy_env</span><span class='hs-layout'>,</span><span class='hs-varid'>var_env</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>new_id</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tidyIdBndr</span> <span class='hs-varid'>env</span> <span class='hs-varid'>id</span>
<a name="line-26"></a>
<a name="line-27"></a> <span class='hs-comment'>-- We need to keep around any interesting strictness and</span>
<a name="line-28"></a> <span class='hs-comment'>-- demand info because later on we may need to use it when</span>
<a name="line-29"></a> <span class='hs-comment'>-- converting to A-normal form.</span>
<a name="line-30"></a> <span class='hs-comment'>-- eg.</span>
<a name="line-31"></a> <span class='hs-comment'>-- f (g x), where f is strict in its argument, will be converted</span>
<a name="line-32"></a> <span class='hs-comment'>-- into case (g x) of z -> f z by CorePrep, but only if f still</span>
<a name="line-33"></a> <span class='hs-comment'>-- has its strictness info.</span>
<a name="line-34"></a> <span class='hs-comment'>--</span>
<a name="line-35"></a> <span class='hs-comment'>-- Similarly for the demand info - on a let binder, this tells </span>
<a name="line-36"></a> <span class='hs-comment'>-- CorePrep to turn the let into a case.</span>
<a name="line-37"></a> <span class='hs-comment'>--</span>
<a name="line-38"></a> <span class='hs-comment'>-- Similarly arity info for eta expansion in CorePrep</span>
<a name="line-39"></a> <span class='hs-comment'>-- </span>
<a name="line-40"></a> <span class='hs-comment'>-- Set inline-prag info so that we preseve it across </span>
<a name="line-41"></a> <span class='hs-comment'>-- separate compilation boundaries</span>
<a name="line-42"></a> <span class='hs-varid'>final_id</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>new_id</span> <span class='hs-varop'>`setIdInfo`</span> <span class='hs-varid'>new_info</span>
<a name="line-43"></a> <span class='hs-varid'>idinfo</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>idInfo</span> <span class='hs-varid'>id</span>
<a name="line-44"></a> <span class='hs-varid'>new_info</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>vanillaIdInfo</span>
<a name="line-45"></a> <span class='hs-varop'>`setArityInfo`</span> <span class='hs-varid'>exprArity</span> <span class='hs-varid'>rhs</span>
<a name="line-46"></a> <span class='hs-varop'>`setAllStrictnessInfo`</span> <span class='hs-varid'>newStrictnessInfo</span> <span class='hs-varid'>idinfo</span>
<a name="line-47"></a> <span class='hs-varop'>`setNewDemandInfo`</span> <span class='hs-varid'>newDemandInfo</span> <span class='hs-varid'>idinfo</span>
<a name="line-48"></a> <span class='hs-varop'>`setInlinePragInfo`</span> <span class='hs-varid'>inlinePragInfo</span> <span class='hs-varid'>idinfo</span>
<a name="line-49"></a>
<a name="line-50"></a> <span class='hs-comment'>-- Override the env we get back from tidyId with the new IdInfo</span>
<a name="line-51"></a> <span class='hs-comment'>-- so it gets propagated to the usage sites.</span>
<a name="line-52"></a> <span class='hs-varid'>new_var_env</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>extendVarEnv</span> <span class='hs-varid'>var_env</span> <span class='hs-varid'>id</span> <span class='hs-varid'>final_id</span>
<a name="line-53"></a>
<a name="line-54"></a><a name="tidyIdBndr"></a><span class='hs-comment'>-- Non-top-level variables</span>
<a name="line-55"></a><span class='hs-definition'>tidyIdBndr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TidyEnv</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-conid'>TidyEnv</span><span class='hs-layout'>,</span> <span class='hs-conid'>Id</span><span class='hs-layout'>)</span>
<a name="line-56"></a><span class='hs-definition'>tidyIdBndr</span> <span class='hs-varid'>env</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-varid'>tidy_env</span><span class='hs-layout'>,</span> <span class='hs-varid'>var_env</span><span class='hs-layout'>)</span> <span class='hs-varid'>id</span>
<a name="line-57"></a> <span class='hs-keyglyph'>=</span> <span class='hs-comment'>-- do this pattern match strictly, otherwise we end up holding on to</span>
<a name="line-58"></a> <span class='hs-comment'>-- stuff in the OccName.</span>
<a name="line-59"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>tidyOccName</span> <span class='hs-varid'>tidy_env</span> <span class='hs-layout'>(</span><span class='hs-varid'>getOccName</span> <span class='hs-varid'>id</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span> <span class='hs-layout'>{</span> <span class='hs-layout'>(</span><span class='hs-varid'>tidy_env'</span><span class='hs-layout'>,</span> <span class='hs-varid'>occ'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-60"></a> <span class='hs-keyword'>let</span>
<a name="line-61"></a> <span class='hs-comment'>-- Give the Id a fresh print-name, *and* rename its type</span>
<a name="line-62"></a> <span class='hs-comment'>-- The SrcLoc isn't important now, </span>
<a name="line-63"></a> <span class='hs-comment'>-- though we could extract it from the Id</span>
<a name="line-64"></a> <span class='hs-comment'>-- </span>
<a name="line-65"></a> <span class='hs-comment'>-- All nested Ids now have the same IdInfo, namely vanillaIdInfo,</span>
<a name="line-66"></a> <span class='hs-comment'>-- which should save some space; except that we hang onto dead-ness</span>
<a name="line-67"></a> <span class='hs-comment'>-- (at the moment, solely to make printing tidy core nicer)</span>
<a name="line-68"></a> <span class='hs-comment'>-- But note that tidyLetBndr puts some of it back.</span>
<a name="line-69"></a> <span class='hs-varid'>ty'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tidyType</span> <span class='hs-varid'>env</span> <span class='hs-layout'>(</span><span class='hs-varid'>idType</span> <span class='hs-varid'>id</span><span class='hs-layout'>)</span>
<a name="line-70"></a> <span class='hs-varid'>name'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkInternalName</span> <span class='hs-layout'>(</span><span class='hs-varid'>idUnique</span> <span class='hs-varid'>id</span><span class='hs-layout'>)</span> <span class='hs-varid'>occ'</span> <span class='hs-varid'>noSrcSpan</span>
<a name="line-71"></a> <span class='hs-varid'>id'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkLocalIdWithInfo</span> <span class='hs-varid'>name'</span> <span class='hs-varid'>ty'</span> <span class='hs-varid'>new_info</span>
<a name="line-72"></a> <span class='hs-varid'>var_env'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>extendVarEnv</span> <span class='hs-varid'>var_env</span> <span class='hs-varid'>id</span> <span class='hs-varid'>id'</span>
<a name="line-73"></a> <span class='hs-varid'>new_info</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isDeadOcc</span> <span class='hs-layout'>(</span><span class='hs-varid'>idOccInfo</span> <span class='hs-varid'>id</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>deadIdInfo</span>
<a name="line-74"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>vanillaIdInfo</span>
<a name="line-75"></a> <span class='hs-keyword'>in</span>
<a name="line-76"></a> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>tidy_env'</span><span class='hs-layout'>,</span> <span class='hs-varid'>var_env'</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>id'</span><span class='hs-layout'>)</span>
<a name="line-77"></a> <span class='hs-layout'>}</span>
<a name="line-78"></a>
<a name="line-79"></a><a name="deadIdInfo"></a><span class='hs-definition'>deadIdInfo</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IdInfo</span>
<a name="line-80"></a><span class='hs-definition'>deadIdInfo</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>vanillaIdInfo</span> <span class='hs-varop'>`setOccInfo`</span> <span class='hs-conid'>IAmDead</span>
</pre>\end{code}
\begin{code}
<pre><a name="line-1"></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-2"></a><a name="m"></a><span class='hs-definition'>m</span> <span class='hs-varop'>=:</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>m</span> <span class='hs-varop'>`seq`</span> <span class='hs-varid'>k</span> <span class='hs-varid'>m</span>
</pre>\end{code}
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