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<pre><a name="line-1"></a>
<a name="line-2"></a><span class='hs-comment'>-- | Bits and pieces on the bottom of the module dependency tree.</span>
<a name="line-3"></a><span class='hs-comment'>-- Also import the required constants, so we know what we're using.</span>
<a name="line-4"></a><span class='hs-comment'>-- </span>
<a name="line-5"></a><span class='hs-comment'>-- In the interests of cross-compilation, we want to free ourselves</span>
<a name="line-6"></a><span class='hs-comment'>-- from the autoconf generated modules like main/Constants</span>
<a name="line-7"></a><span class='hs-comment'>--</span>
<a name="line-8"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>SPARC</span><span class='hs-varop'>.</span><span class='hs-conid'>Base</span> <span class='hs-layout'>(</span>
<a name="line-9"></a> <span class='hs-varid'>wordLength</span><span class='hs-layout'>,</span>
<a name="line-10"></a> <span class='hs-varid'>wordLengthInBits</span><span class='hs-layout'>,</span>
<a name="line-11"></a> <span class='hs-varid'>spillAreaLength</span><span class='hs-layout'>,</span>
<a name="line-12"></a> <span class='hs-varid'>spillSlotSize</span><span class='hs-layout'>,</span>
<a name="line-13"></a> <span class='hs-varid'>extraStackArgsHere</span><span class='hs-layout'>,</span>
<a name="line-14"></a> <span class='hs-varid'>fits13Bits</span><span class='hs-layout'>,</span>
<a name="line-15"></a> <span class='hs-varid'>is32BitInteger</span><span class='hs-layout'>,</span>
<a name="line-16"></a> <span class='hs-varid'>largeOffsetError</span>
<a name="line-17"></a><span class='hs-layout'>)</span>
<a name="line-18"></a>
<a name="line-19"></a><span class='hs-keyword'>where</span>
<a name="line-20"></a>
<a name="line-21"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Constants</span>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Panic</span>
<a name="line-23"></a>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Int</span>
<a name="line-25"></a>
<a name="line-26"></a>
<a name="line-27"></a><a name="wordLength"></a><span class='hs-comment'>-- On 32 bit SPARC, pointers are 32 bits.</span>
<a name="line-28"></a><span class='hs-definition'>wordLength</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span>
<a name="line-29"></a><span class='hs-definition'>wordLength</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>4</span>
<a name="line-30"></a>
<a name="line-31"></a><a name="wordLengthInBits"></a><span class='hs-definition'>wordLengthInBits</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span>
<a name="line-32"></a><span class='hs-definition'>wordLengthInBits</span>
<a name="line-33"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>wordLength</span> <span class='hs-varop'>*</span> <span class='hs-num'>8</span>
<a name="line-34"></a>
<a name="line-35"></a><a name="spillAreaLength"></a><span class='hs-comment'>-- Size of the available spill area</span>
<a name="line-36"></a><span class='hs-definition'>spillAreaLength</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span>
<a name="line-37"></a><span class='hs-definition'>spillAreaLength</span>
<a name="line-38"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Constants</span><span class='hs-varop'>.</span><span class='hs-varid'>rESERVED_C_STACK_BYTES</span>
<a name="line-39"></a>
<a name="line-40"></a><a name="spillSlotSize"></a><span class='hs-comment'>-- | We need 8 bytes because our largest registers are 64 bit.</span>
<a name="line-41"></a><span class='hs-definition'>spillSlotSize</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span>
<a name="line-42"></a><span class='hs-definition'>spillSlotSize</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>8</span>
<a name="line-43"></a>
<a name="line-44"></a>
<a name="line-45"></a><a name="extraStackArgsHere"></a><span class='hs-comment'>-- | We (allegedly) put the first six C-call arguments in registers;</span>
<a name="line-46"></a><span class='hs-comment'>-- where do we start putting the rest of them?</span>
<a name="line-47"></a><span class='hs-definition'>extraStackArgsHere</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span>
<a name="line-48"></a><span class='hs-definition'>extraStackArgsHere</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>23</span>
<a name="line-49"></a>
<a name="line-50"></a>
<a name="line-51"></a><a name="fits13Bits"></a><span class='hs-comment'>{-# SPECIALIZE fits13Bits :: Int -> Bool, Integer -> Bool #-}</span>
<a name="line-52"></a><span class='hs-comment'>-- | Check whether an offset is representable with 13 bits.</span>
<a name="line-53"></a><span class='hs-definition'>fits13Bits</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Integral</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-54"></a><span class='hs-definition'>fits13Bits</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-varop'>>=</span> <span class='hs-comment'>-</span><span class='hs-num'>4096</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>x</span> <span class='hs-varop'><</span> <span class='hs-num'>4096</span>
<a name="line-55"></a>
<a name="line-56"></a><a name="is32BitInteger"></a><span class='hs-comment'>-- | Check whether an integer will fit in 32 bits.</span>
<a name="line-57"></a><span class='hs-comment'>-- A CmmInt is intended to be truncated to the appropriate </span>
<a name="line-58"></a><span class='hs-comment'>-- number of bits, so here we truncate it to Int64. This is</span>
<a name="line-59"></a><span class='hs-comment'>-- important because e.g. -1 as a CmmInt might be either</span>
<a name="line-60"></a><span class='hs-comment'>-- -1 or 18446744073709551615.</span>
<a name="line-61"></a><span class='hs-comment'>--</span>
<a name="line-62"></a><span class='hs-definition'>is32BitInteger</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Integer</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-63"></a><span class='hs-definition'>is32BitInteger</span> <span class='hs-varid'>i</span>
<a name="line-64"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>i64</span> <span class='hs-varop'><=</span> <span class='hs-num'>0x7fffffff</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>i64</span> <span class='hs-varop'>>=</span> <span class='hs-comment'>-</span><span class='hs-num'>0x80000000</span>
<a name="line-65"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>i64</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int64</span>
<a name="line-66"></a>
<a name="line-67"></a>
<a name="line-68"></a><a name="largeOffsetError"></a><span class='hs-comment'>-- | Sadness.</span>
<a name="line-69"></a><span class='hs-definition'>largeOffsetError</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Integral</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span>
<a name="line-70"></a><span class='hs-definition'>largeOffsetError</span> <span class='hs-varid'>i</span>
<a name="line-71"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>panic</span> <span class='hs-layout'>(</span><span class='hs-str'>"ERROR: SPARC native-code generator cannot handle large offset ("</span>
<a name="line-72"></a> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>i</span> <span class='hs-varop'>++</span> <span class='hs-str'>");\nprobably because of large constant data structures;"</span> <span class='hs-varop'>++</span>
<a name="line-73"></a> <span class='hs-str'>"\nworkaround: use -fvia-C on this module.\n"</span><span class='hs-layout'>)</span>
<a name="line-74"></a>
<a name="line-75"></a>
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