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<title>Data/Text/Unsafe/Base.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE CPP, MagicHash, UnboxedTuples #-}</span>
<a name="line-2"></a><span class='hs-comment'>-- |</span>
<a name="line-3"></a><span class='hs-comment'>-- Module : Data.Text.Unsafe.Base</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright : (c) 2009, 2010, 2011 Bryan O'Sullivan</span>
<a name="line-5"></a><span class='hs-comment'>-- License : BSD-style</span>
<a name="line-6"></a><span class='hs-comment'>-- Maintainer : bos@serpentine.com, rtomharper@googlemail.com,</span>
<a name="line-7"></a><span class='hs-comment'>-- duncan@haskell.org</span>
<a name="line-8"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-9"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-10"></a><span class='hs-comment'>--</span>
<a name="line-11"></a><span class='hs-comment'>-- A module containing unsafe operations, for very very careful use in</span>
<a name="line-12"></a><span class='hs-comment'>-- heavily tested code.</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'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Unsafe</span><span class='hs-varop'>.</span><span class='hs-conid'>Base</span>
<a name="line-14"></a> <span class='hs-layout'>(</span>
<a name="line-15"></a> <span class='hs-varid'>inlineInterleaveST</span>
<a name="line-16"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>inlinePerformIO</span>
<a name="line-17"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-18"></a>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>ST</span> <span class='hs-layout'>(</span><span class='hs-conid'>ST</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-20"></a><span class='hs-cpp'>#if defined(__GLASGOW_HASKELL__)</span>
<a name="line-21"></a><span class='hs-cpp'># if __GLASGOW_HASKELL__ >= 611</span>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>IO</span><span class='hs-layout'>(</span><span class='hs-conid'>IO</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-23"></a><span class='hs-cpp'># else</span>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>IOBase</span> <span class='hs-layout'>(</span><span class='hs-conid'>IO</span><span class='hs-layout'>(</span><span class='hs-conid'>IO</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-25"></a><span class='hs-cpp'># endif</span>
<a name="line-26"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>Base</span> <span class='hs-layout'>(</span><span class='hs-varid'>realWorld</span><span class='hs-cpp'>#</span><span class='hs-layout'>)</span>
<a name="line-27"></a><span class='hs-cpp'>#endif</span>
<a name="line-28"></a>
<a name="line-29"></a>
<a name="line-30"></a><a name="inlinePerformIO"></a><span class='hs-comment'>-- | Just like unsafePerformIO, but we inline it. Big performance gains as</span>
<a name="line-31"></a><span class='hs-comment'>-- it exposes lots of things to further inlining. /Very unsafe/. In</span>
<a name="line-32"></a><span class='hs-comment'>-- particular, you should do no memory allocation inside an</span>
<a name="line-33"></a><span class='hs-comment'>-- 'inlinePerformIO' block. On Hugs this is just @unsafePerformIO@.</span>
<a name="line-34"></a><span class='hs-comment'>--</span>
<a name="line-35"></a><span class='hs-comment'>{-# INLINE inlinePerformIO #-}</span>
<a name="line-36"></a><span class='hs-definition'>inlinePerformIO</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-37"></a><span class='hs-cpp'>#if defined(__GLASGOW_HASKELL__)</span>
<a name="line-38"></a><span class='hs-definition'>inlinePerformIO</span> <span class='hs-layout'>(</span><span class='hs-conid'>IO</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>m</span> <span class='hs-varid'>realWorld</span><span class='hs-cpp'>#</span> <span class='hs-keyword'>of</span> <span class='hs-layout'>(</span><span class='hs-cpp'>#</span> <span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>r</span> <span class='hs-cpp'>#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>r</span>
<a name="line-39"></a><span class='hs-cpp'>#else</span>
<a name="line-40"></a><span class='hs-definition'>inlinePerformIO</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unsafePerformIO</span>
<a name="line-41"></a><span class='hs-cpp'>#endif</span>
<a name="line-42"></a>
<a name="line-43"></a><a name="inlineInterleaveST"></a><span class='hs-comment'>-- | Allow an 'ST' computation to be deferred lazily. When passed an</span>
<a name="line-44"></a><span class='hs-comment'>-- action of type 'ST' @s@ @a@, the action will only be performed when</span>
<a name="line-45"></a><span class='hs-comment'>-- the value of @a@ is demanded.</span>
<a name="line-46"></a><span class='hs-comment'>--</span>
<a name="line-47"></a><span class='hs-comment'>-- This function is identical to the normal unsafeInterleaveST, but is</span>
<a name="line-48"></a><span class='hs-comment'>-- inlined and hence faster.</span>
<a name="line-49"></a><span class='hs-comment'>--</span>
<a name="line-50"></a><span class='hs-comment'>-- /Note/: This operation is highly unsafe, as it can introduce</span>
<a name="line-51"></a><span class='hs-comment'>-- externally visible non-determinism into an 'ST' action.</span>
<a name="line-52"></a><span class='hs-definition'>inlineInterleaveST</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ST</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ST</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span>
<a name="line-53"></a><span class='hs-definition'>inlineInterleaveST</span> <span class='hs-layout'>(</span><span class='hs-conid'>ST</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ST</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span>
<a name="line-54"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>m</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span> <span class='hs-layout'>(</span><span class='hs-cpp'>#</span> <span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>res</span> <span class='hs-cpp'>#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>res</span> <span class='hs-keyword'>in</span> <span class='hs-layout'>(</span><span class='hs-cpp'>#</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>r</span> <span class='hs-cpp'>#</span><span class='hs-layout'>)</span>
<a name="line-55"></a><span class='hs-comment'>{-# INLINE inlineInterleaveST #-}</span>
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