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<title>Data/Memory/Internal/Scrubber.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>-- |</span>
<a name="line-2"></a><span class='hs-comment'>-- Module : Data.Memory.Internal.Scrubber</span>
<a name="line-3"></a><span class='hs-comment'>-- License : BSD-style</span>
<a name="line-4"></a><span class='hs-comment'>-- Maintainer : Vincent Hanquez <vincent@snarc.org></span>
<a name="line-5"></a><span class='hs-comment'>-- Stability : stable</span>
<a name="line-6"></a><span class='hs-comment'>-- Portability : Compat</span>
<a name="line-7"></a><span class='hs-comment'>--</span>
<a name="line-8"></a><span class='hs-comment'>{-# LANGUAGE CPP #-}</span>
<a name="line-9"></a><span class='hs-comment'>{-# LANGUAGE BangPatterns #-}</span>
<a name="line-10"></a><span class='hs-comment'>{-# LANGUAGE MagicHash #-}</span>
<a name="line-11"></a><span class='hs-comment'>{-# LANGUAGE UnboxedTuples #-}</span>
<a name="line-12"></a><span class='hs-cpp'>#include "MachDeps.h"</span>
<a name="line-13"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Memory</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span><span class='hs-varop'>.</span><span class='hs-conid'>Scrubber</span>
<a name="line-14"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>getScrubber</span>
<a name="line-15"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-16"></a>
<a name="line-17"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>Prim</span>
<a name="line-18"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span>
<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'>Memory</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span><span class='hs-varop'>.</span><span class='hs-conid'>CompatPrim</span> <span class='hs-layout'>(</span><span class='hs-varid'>booleanPrim</span><span class='hs-layout'>)</span>
<a name="line-20"></a>
<a name="line-21"></a><a name="getScrubber"></a><span class='hs-definition'>getScrubber</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span><span class='hs-cpp'>#</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Addr</span><span class='hs-cpp'>#</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-22"></a><span class='hs-definition'>getScrubber</span> <span class='hs-varid'>sz</span>
<a name="line-23"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>booleanPrim</span> <span class='hs-layout'>(</span><span class='hs-varid'>sz</span> <span class='hs-varop'>==#</span> <span class='hs-num'>4</span><span class='hs-cpp'>#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>scrub4</span>
<a name="line-24"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>booleanPrim</span> <span class='hs-layout'>(</span><span class='hs-varid'>sz</span> <span class='hs-varop'>==#</span> <span class='hs-num'>8</span><span class='hs-cpp'>#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>scrub8</span>
<a name="line-25"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>booleanPrim</span> <span class='hs-layout'>(</span><span class='hs-varid'>sz</span> <span class='hs-varop'>==#</span> <span class='hs-num'>16</span><span class='hs-cpp'>#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>scrub16</span>
<a name="line-26"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>booleanPrim</span> <span class='hs-layout'>(</span><span class='hs-varid'>sz</span> <span class='hs-varop'>==#</span> <span class='hs-num'>32</span><span class='hs-cpp'>#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>scrub32</span>
<a name="line-27"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>scrubBytes</span> <span class='hs-varid'>sz</span>
<a name="line-28"></a> <span class='hs-keyword'>where</span>
<a name="line-29"></a> <span class='hs-varid'>scrub4</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IO</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-cpp'>#</span> <span class='hs-varid'>writeWord32OffAddr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-num'>0</span><span class='hs-cpp'>#</span> <span class='hs-num'>0</span><span class='hs-cpp'>##</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-conid'>()</span> <span class='hs-cpp'>#</span><span class='hs-layout'>)</span>
<a name="line-30"></a><span class='hs-cpp'>#if WORD_SIZE_IN_BITS == 64</span>
<a name="line-31"></a> <span class='hs-varid'>scrub8</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IO</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-cpp'>#</span> <span class='hs-varid'>writeWord64OffAddr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-num'>0</span><span class='hs-cpp'>#</span> <span class='hs-num'>0</span><span class='hs-cpp'>##</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-conid'>()</span> <span class='hs-cpp'>#</span><span class='hs-layout'>)</span>
<a name="line-32"></a> <span class='hs-varid'>scrub16</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IO</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>s1</span> <span class='hs-keyglyph'>-></span>
<a name="line-33"></a> <span class='hs-keyword'>let</span> <span class='hs-varop'>!</span><span class='hs-varid'>s2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeWord64OffAddr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-num'>0</span><span class='hs-cpp'>#</span> <span class='hs-num'>0</span><span class='hs-cpp'>##</span> <span class='hs-varid'>s1</span>
<a name="line-34"></a> <span class='hs-varop'>!</span><span class='hs-varid'>s3</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeWord64OffAddr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-num'>1</span><span class='hs-cpp'>#</span> <span class='hs-num'>0</span><span class='hs-cpp'>##</span> <span class='hs-varid'>s2</span>
<a name="line-35"></a> <span class='hs-keyword'>in</span> <span class='hs-layout'>(</span><span class='hs-cpp'>#</span> <span class='hs-varid'>s3</span><span class='hs-layout'>,</span> <span class='hs-conid'>()</span> <span class='hs-cpp'>#</span><span class='hs-layout'>)</span>
<a name="line-36"></a> <span class='hs-varid'>scrub32</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IO</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>s1</span> <span class='hs-keyglyph'>-></span>
<a name="line-37"></a> <span class='hs-keyword'>let</span> <span class='hs-varop'>!</span><span class='hs-varid'>s2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeWord64OffAddr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-num'>0</span><span class='hs-cpp'>#</span> <span class='hs-num'>0</span><span class='hs-cpp'>##</span> <span class='hs-varid'>s1</span>
<a name="line-38"></a> <span class='hs-varop'>!</span><span class='hs-varid'>s3</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeWord64OffAddr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-num'>1</span><span class='hs-cpp'>#</span> <span class='hs-num'>0</span><span class='hs-cpp'>##</span> <span class='hs-varid'>s2</span>
<a name="line-39"></a> <span class='hs-varop'>!</span><span class='hs-varid'>s4</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeWord64OffAddr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-num'>2</span><span class='hs-cpp'>#</span> <span class='hs-num'>0</span><span class='hs-cpp'>##</span> <span class='hs-varid'>s3</span>
<a name="line-40"></a> <span class='hs-varop'>!</span><span class='hs-varid'>s5</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeWord64OffAddr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-num'>3</span><span class='hs-cpp'>#</span> <span class='hs-num'>0</span><span class='hs-cpp'>##</span> <span class='hs-varid'>s4</span>
<a name="line-41"></a> <span class='hs-keyword'>in</span> <span class='hs-layout'>(</span><span class='hs-cpp'>#</span> <span class='hs-varid'>s5</span><span class='hs-layout'>,</span> <span class='hs-conid'>()</span> <span class='hs-cpp'>#</span><span class='hs-layout'>)</span>
<a name="line-42"></a><span class='hs-cpp'>#else</span>
<a name="line-43"></a> <span class='hs-varid'>scrub8</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IO</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>s1</span> <span class='hs-keyglyph'>-></span>
<a name="line-44"></a> <span class='hs-keyword'>let</span> <span class='hs-varop'>!</span><span class='hs-varid'>s2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeWord32OffAddr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-num'>0</span><span class='hs-cpp'>#</span> <span class='hs-num'>0</span><span class='hs-cpp'>##</span> <span class='hs-varid'>s1</span>
<a name="line-45"></a> <span class='hs-varop'>!</span><span class='hs-varid'>s3</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeWord32OffAddr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-num'>1</span><span class='hs-cpp'>#</span> <span class='hs-num'>0</span><span class='hs-cpp'>##</span> <span class='hs-varid'>s2</span>
<a name="line-46"></a> <span class='hs-keyword'>in</span> <span class='hs-layout'>(</span><span class='hs-cpp'>#</span> <span class='hs-varid'>s3</span><span class='hs-layout'>,</span> <span class='hs-conid'>()</span> <span class='hs-cpp'>#</span><span class='hs-layout'>)</span>
<a name="line-47"></a> <span class='hs-varid'>scrub16</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IO</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>s1</span> <span class='hs-keyglyph'>-></span>
<a name="line-48"></a> <span class='hs-keyword'>let</span> <span class='hs-varop'>!</span><span class='hs-varid'>s2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeWord32OffAddr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-num'>0</span><span class='hs-cpp'>#</span> <span class='hs-num'>0</span><span class='hs-cpp'>##</span> <span class='hs-varid'>s1</span>
<a name="line-49"></a> <span class='hs-varop'>!</span><span class='hs-varid'>s3</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeWord32OffAddr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-num'>1</span><span class='hs-cpp'>#</span> <span class='hs-num'>0</span><span class='hs-cpp'>##</span> <span class='hs-varid'>s2</span>
<a name="line-50"></a> <span class='hs-varop'>!</span><span class='hs-varid'>s4</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeWord32OffAddr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-num'>2</span><span class='hs-cpp'>#</span> <span class='hs-num'>0</span><span class='hs-cpp'>##</span> <span class='hs-varid'>s3</span>
<a name="line-51"></a> <span class='hs-varop'>!</span><span class='hs-varid'>s5</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeWord32OffAddr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-num'>3</span><span class='hs-cpp'>#</span> <span class='hs-num'>0</span><span class='hs-cpp'>##</span> <span class='hs-varid'>s4</span>
<a name="line-52"></a> <span class='hs-keyword'>in</span> <span class='hs-layout'>(</span><span class='hs-cpp'>#</span> <span class='hs-varid'>s5</span><span class='hs-layout'>,</span> <span class='hs-conid'>()</span> <span class='hs-cpp'>#</span><span class='hs-layout'>)</span>
<a name="line-53"></a> <span class='hs-varid'>scrub32</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IO</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>s1</span> <span class='hs-keyglyph'>-></span>
<a name="line-54"></a> <span class='hs-keyword'>let</span> <span class='hs-varop'>!</span><span class='hs-varid'>s2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeWord32OffAddr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-num'>0</span><span class='hs-cpp'>#</span> <span class='hs-num'>0</span><span class='hs-cpp'>##</span> <span class='hs-varid'>s1</span>
<a name="line-55"></a> <span class='hs-varop'>!</span><span class='hs-varid'>s3</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeWord32OffAddr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-num'>1</span><span class='hs-cpp'>#</span> <span class='hs-num'>0</span><span class='hs-cpp'>##</span> <span class='hs-varid'>s2</span>
<a name="line-56"></a> <span class='hs-varop'>!</span><span class='hs-varid'>s4</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeWord32OffAddr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-num'>2</span><span class='hs-cpp'>#</span> <span class='hs-num'>0</span><span class='hs-cpp'>##</span> <span class='hs-varid'>s3</span>
<a name="line-57"></a> <span class='hs-varop'>!</span><span class='hs-varid'>s5</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeWord32OffAddr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-num'>3</span><span class='hs-cpp'>#</span> <span class='hs-num'>0</span><span class='hs-cpp'>##</span> <span class='hs-varid'>s4</span>
<a name="line-58"></a> <span class='hs-varop'>!</span><span class='hs-varid'>s6</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeWord32OffAddr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-num'>4</span><span class='hs-cpp'>#</span> <span class='hs-num'>0</span><span class='hs-cpp'>##</span> <span class='hs-varid'>s5</span>
<a name="line-59"></a> <span class='hs-varop'>!</span><span class='hs-varid'>s7</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeWord32OffAddr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-num'>5</span><span class='hs-cpp'>#</span> <span class='hs-num'>0</span><span class='hs-cpp'>##</span> <span class='hs-varid'>s6</span>
<a name="line-60"></a> <span class='hs-varop'>!</span><span class='hs-varid'>s8</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeWord32OffAddr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-num'>6</span><span class='hs-cpp'>#</span> <span class='hs-num'>0</span><span class='hs-cpp'>##</span> <span class='hs-varid'>s7</span>
<a name="line-61"></a> <span class='hs-varop'>!</span><span class='hs-varid'>s9</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeWord32OffAddr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-num'>7</span><span class='hs-cpp'>#</span> <span class='hs-num'>0</span><span class='hs-cpp'>##</span> <span class='hs-varid'>s8</span>
<a name="line-62"></a> <span class='hs-keyword'>in</span> <span class='hs-layout'>(</span><span class='hs-cpp'>#</span> <span class='hs-varid'>s9</span><span class='hs-layout'>,</span> <span class='hs-conid'>()</span> <span class='hs-cpp'>#</span><span class='hs-layout'>)</span>
<a name="line-63"></a><span class='hs-cpp'>#endif</span>
<a name="line-64"></a>
<a name="line-65"></a><a name="scrubBytes"></a><span class='hs-definition'>scrubBytes</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span><span class='hs-cpp'>#</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Addr</span><span class='hs-cpp'>#</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-66"></a><span class='hs-definition'>scrubBytes</span> <span class='hs-varid'>sz8</span> <span class='hs-varid'>addr</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IO</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-cpp'>#</span> <span class='hs-varid'>loop</span> <span class='hs-varid'>sz8</span> <span class='hs-varid'>addr</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-conid'>()</span> <span class='hs-cpp'>#</span><span class='hs-layout'>)</span>
<a name="line-67"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>loop</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span><span class='hs-cpp'>#</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Addr</span><span class='hs-cpp'>#</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>State</span><span class='hs-cpp'>#</span> <span class='hs-conid'>RealWorld</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>State</span><span class='hs-cpp'>#</span> <span class='hs-conid'>RealWorld</span>
<a name="line-68"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>n</span> <span class='hs-varid'>a</span> <span class='hs-varid'>s</span>
<a name="line-69"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>booleanPrim</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span> <span class='hs-varop'>==#</span> <span class='hs-num'>0</span><span class='hs-cpp'>#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>s</span>
<a name="line-70"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span>
<a name="line-71"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>writeWord8OffAddr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-num'>0</span><span class='hs-cpp'>#</span> <span class='hs-num'>0</span><span class='hs-cpp'>##</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-72"></a> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span> <span class='hs-varop'>-#</span> <span class='hs-num'>1</span><span class='hs-cpp'>#</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>plusAddr</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span> <span class='hs-num'>1</span><span class='hs-cpp'>#</span><span class='hs-layout'>)</span> <span class='hs-varid'>s'</span>
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