<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html> <head> <!-- Generated by HsColour, http://www.cs.york.ac.uk/fp/darcs/hscolour/ --> <title>nativeGen/SPARC/CodeGen/Sanity.hs</title> <link type='text/css' rel='stylesheet' href='hscolour.css' /> </head> <body> <pre><a name="line-1"></a> <a name="line-2"></a><span class='hs-comment'>-- | One ounce of sanity checking is worth 10000000000000000 ounces </span> <a name="line-3"></a><span class='hs-comment'>-- of staring blindly at assembly code trying to find the problem..</span> <a name="line-4"></a><span class='hs-comment'>--</span> <a name="line-5"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>SPARC</span><span class='hs-varop'>.</span><span class='hs-conid'>CodeGen</span><span class='hs-varop'>.</span><span class='hs-conid'>Sanity</span> <span class='hs-layout'>(</span> <a name="line-6"></a> <span class='hs-varid'>checkBlock</span> <a name="line-7"></a><span class='hs-layout'>)</span> <a name="line-8"></a> <a name="line-9"></a><span class='hs-keyword'>where</span> <a name="line-10"></a> <a name="line-11"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>SPARC</span><span class='hs-varop'>.</span><span class='hs-conid'>Instr</span> <a name="line-12"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>SPARC</span><span class='hs-varop'>.</span><span class='hs-conid'>Ppr</span> <span class='hs-conid'>()</span> <a name="line-13"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Instruction</span> <a name="line-14"></a> <a name="line-15"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Cmm</span> <a name="line-16"></a> <a name="line-17"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Outputable</span> <a name="line-18"></a> <a name="line-19"></a> <a name="line-20"></a><a name="checkBlock"></a><span class='hs-comment'>-- | Enforce intra-block invariants.</span> <a name="line-21"></a><span class='hs-comment'>--</span> <a name="line-22"></a><span class='hs-definition'>checkBlock</span> <a name="line-23"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CmmBasicBlock</span> <a name="line-24"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>NatBasicBlock</span> <span class='hs-conid'>Instr</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>NatBasicBlock</span> <span class='hs-conid'>Instr</span> <a name="line-25"></a> <a name="line-26"></a><span class='hs-definition'>checkBlock</span> <span class='hs-varid'>cmm</span> <span class='hs-varid'>block</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>BasicBlock</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>instrs</span><span class='hs-layout'>)</span> <a name="line-27"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>checkBlockInstrs</span> <span class='hs-varid'>instrs</span> <a name="line-28"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>block</span> <a name="line-29"></a> <a name="line-30"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <a name="line-31"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>pprPanic</span> <a name="line-32"></a> <span class='hs-layout'>(</span><span class='hs-str'>"SPARC.CodeGen: bad block\n"</span><span class='hs-layout'>)</span> <a name="line-33"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>vcat</span> <span class='hs-keyglyph'>[</span> <span class='hs-varid'>text</span> <span class='hs-str'>" -- cmm -----------------\n"</span> <a name="line-34"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>ppr</span> <span class='hs-varid'>cmm</span> <a name="line-35"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>text</span> <span class='hs-str'>" -- native code ---------\n"</span> <a name="line-36"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>ppr</span> <span class='hs-varid'>block</span> <span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <a name="line-37"></a> <a name="line-38"></a> <a name="line-39"></a><a name="checkBlockInstrs"></a><span class='hs-definition'>checkBlockInstrs</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Instr</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span> <a name="line-40"></a><span class='hs-definition'>checkBlockInstrs</span> <span class='hs-varid'>ii</span> <a name="line-41"></a> <a name="line-42"></a> <span class='hs-comment'>-- An unconditional jumps end the block.</span> <a name="line-43"></a> <span class='hs-comment'>-- There must be an unconditional jump in the block, otherwise</span> <a name="line-44"></a> <span class='hs-comment'>-- the register liveness determinator will get the liveness</span> <a name="line-45"></a> <span class='hs-comment'>-- information wrong. </span> <a name="line-46"></a> <span class='hs-comment'>--</span> <a name="line-47"></a> <span class='hs-comment'>-- If the block ends with a cmm call that never returns</span> <a name="line-48"></a> <span class='hs-comment'>-- then there can be unreachable instructions after the jump,</span> <a name="line-49"></a> <span class='hs-comment'>-- but we don't mind here.</span> <a name="line-50"></a> <span class='hs-comment'>--</span> <a name="line-51"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>instr</span> <span class='hs-conop'>:</span> <span class='hs-conid'>NOP</span> <span class='hs-conop'>:</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>ii</span> <a name="line-52"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>isUnconditionalJump</span> <span class='hs-varid'>instr</span> <a name="line-53"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span> <a name="line-54"></a> <a name="line-55"></a> <span class='hs-comment'>-- All jumps must have a NOP in their branch delay slot.</span> <a name="line-56"></a> <span class='hs-comment'>-- The liveness determinator and register allocators aren't smart</span> <a name="line-57"></a> <span class='hs-comment'>-- enough to handle branch delay slots.</span> <a name="line-58"></a> <span class='hs-comment'>--</span> <a name="line-59"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>instr</span> <span class='hs-conop'>:</span> <span class='hs-conid'>NOP</span> <span class='hs-conop'>:</span> <span class='hs-varid'>is</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>ii</span> <a name="line-60"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>isJumpishInstr</span> <span class='hs-varid'>instr</span> <a name="line-61"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>checkBlockInstrs</span> <span class='hs-varid'>is</span> <a name="line-62"></a> <a name="line-63"></a> <span class='hs-comment'>-- keep checking</span> <a name="line-64"></a> <span class='hs-keyglyph'>|</span> <span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-varid'>i2</span><span class='hs-conop'>:</span><span class='hs-varid'>is</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>ii</span> <a name="line-65"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>checkBlockInstrs</span> <span class='hs-layout'>(</span><span class='hs-varid'>i2</span><span class='hs-conop'>:</span><span class='hs-varid'>is</span><span class='hs-layout'>)</span> <a name="line-66"></a> <a name="line-67"></a> <span class='hs-comment'>-- this block is no good </span> <a name="line-68"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <a name="line-69"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span> <a name="line-70"></a> <a name="line-71"></a> </pre></body> </html>
