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<pre><a name="line-1"></a>
<a name="line-2"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>CmmLiveZ</span>
<a name="line-3"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>CmmLive</span>
<a name="line-4"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>cmmLivenessZ</span>
<a name="line-5"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>liveLattice</span>
<a name="line-6"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>middleLiveness</span><span class='hs-layout'>,</span> <span class='hs-varid'>noLiveOnEntry</span>
<a name="line-7"></a> <span class='hs-layout'>)</span>
<a name="line-8"></a><span class='hs-keyword'>where</span>
<a name="line-9"></a>
<a name="line-10"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>BlockId</span>
<a name="line-11"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>CmmExpr</span>
<a name="line-12"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>CmmTx</span>
<a name="line-13"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>DFMonad</span>
<a name="line-14"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span>
<a name="line-15"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>PprCmm</span><span class='hs-conid'>()</span>
<a name="line-16"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>PprCmmZ</span><span class='hs-conid'>()</span>
<a name="line-17"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>ZipCfg</span>
<a name="line-18"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>ZipDataflow</span>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>ZipCfgCmmRep</span>
<a name="line-20"></a>
<a name="line-21"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Maybes</span>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Outputable</span>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>UniqSet</span>
<a name="line-24"></a>
<a name="line-25"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-26"></a><span class='hs-comment'>-- Calculating what variables are live on entry to a basic block</span>
<a name="line-27"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-28"></a>
<a name="line-29"></a><a name="CmmLive"></a><span class='hs-comment'>-- | The variables live on entry to a block</span>
<a name="line-30"></a><a name="CmmLive"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>CmmLive</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RegSet</span>
<a name="line-31"></a>
<a name="line-32"></a><a name="liveLattice"></a><span class='hs-comment'>-- | The dataflow lattice</span>
<a name="line-33"></a><span class='hs-definition'>liveLattice</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DataflowLattice</span> <span class='hs-conid'>CmmLive</span>
<a name="line-34"></a><span class='hs-definition'>liveLattice</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DataflowLattice</span> <span class='hs-str'>"live LocalReg's"</span> <span class='hs-varid'>emptyUniqSet</span> <span class='hs-varid'>add</span> <span class='hs-conid'>False</span>
<a name="line-35"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>add</span> <span class='hs-varid'>new</span> <span class='hs-varid'>old</span> <span class='hs-keyglyph'>=</span>
<a name="line-36"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>join</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unionUniqSets</span> <span class='hs-varid'>new</span> <span class='hs-varid'>old</span> <span class='hs-keyword'>in</span>
<a name="line-37"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>if</span> <span class='hs-varid'>sizeUniqSet</span> <span class='hs-varid'>join</span> <span class='hs-varop'>></span> <span class='hs-varid'>sizeUniqSet</span> <span class='hs-varid'>old</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>aTx</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>noTx</span><span class='hs-layout'>)</span> <span class='hs-varid'>join</span>
<a name="line-38"></a>
<a name="line-39"></a><a name="BlockEntryLiveness"></a><span class='hs-comment'>-- | A mapping from block labels to the variables live on entry</span>
<a name="line-40"></a><a name="BlockEntryLiveness"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>BlockEntryLiveness</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>BlockEnv</span> <span class='hs-conid'>CmmLive</span>
<a name="line-41"></a>
<a name="line-42"></a><a name="cmmLivenessZ"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-43"></a><span class='hs-comment'>-- | Calculated liveness info for a CmmGraph</span>
<a name="line-44"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-45"></a><span class='hs-definition'>cmmLivenessZ</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CmmGraph</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FuelMonad</span> <span class='hs-conid'>BlockEntryLiveness</span>
<a name="line-46"></a><span class='hs-definition'>cmmLivenessZ</span> <span class='hs-varid'>g</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>LGraph</span> <span class='hs-varid'>entry</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-47"></a> <span class='hs-varid'>liftM</span> <span class='hs-layout'>(</span><span class='hs-varid'>check</span> <span class='hs-varop'>.</span> <span class='hs-varid'>zdfFpFacts</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>res</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>FuelMonad</span> <span class='hs-layout'>(</span><span class='hs-conid'>CmmBackwardFixedPoint</span> <span class='hs-conid'>CmmLive</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-48"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>res</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>zdfSolveFrom</span> <span class='hs-varid'>emptyBlockEnv</span> <span class='hs-str'>"liveness analysis"</span> <span class='hs-varid'>liveLattice</span> <span class='hs-varid'>transfers</span>
<a name="line-49"></a> <span class='hs-varid'>emptyUniqSet</span> <span class='hs-layout'>(</span><span class='hs-varid'>graphOfLGraph</span> <span class='hs-varid'>g</span><span class='hs-layout'>)</span>
<a name="line-50"></a> <span class='hs-varid'>transfers</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>BackwardTransfers</span> <span class='hs-layout'>(</span><span class='hs-varid'>flip</span> <span class='hs-varid'>const</span><span class='hs-layout'>)</span> <span class='hs-varid'>mid</span> <span class='hs-varid'>last</span>
<a name="line-51"></a> <span class='hs-varid'>mid</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>gen_kill</span> <span class='hs-varid'>m</span> <span class='hs-varop'>.</span> <span class='hs-varid'>midLive</span> <span class='hs-varid'>m</span>
<a name="line-52"></a> <span class='hs-varid'>last</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>gen_kill</span> <span class='hs-varid'>l</span> <span class='hs-varop'>.</span> <span class='hs-varid'>lastLive</span> <span class='hs-varid'>l</span>
<a name="line-53"></a> <span class='hs-varid'>check</span> <span class='hs-varid'>facts</span> <span class='hs-keyglyph'>=</span>
<a name="line-54"></a> <span class='hs-varid'>noLiveOnEntry</span> <span class='hs-varid'>entry</span> <span class='hs-layout'>(</span><span class='hs-varid'>expectJust</span> <span class='hs-str'>"check"</span> <span class='hs-varop'>$</span> <span class='hs-varid'>lookupBlockEnv</span> <span class='hs-varid'>facts</span> <span class='hs-varid'>entry</span><span class='hs-layout'>)</span> <span class='hs-varid'>facts</span>
<a name="line-55"></a>
<a name="line-56"></a><a name="gen_kill"></a><span class='hs-definition'>gen_kill</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>DefinerOfLocalRegs</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>UserOfLocalRegs</span> <span class='hs-varid'>a</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-conid'>CmmLive</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CmmLive</span>
<a name="line-57"></a><span class='hs-definition'>gen_kill</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>gen</span> <span class='hs-varid'>a</span> <span class='hs-varop'>.</span> <span class='hs-varid'>kill</span> <span class='hs-varid'>a</span>
<a name="line-58"></a>
<a name="line-59"></a><a name="middleLiveness"></a><span class='hs-definition'>middleLiveness</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Middle</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CmmLive</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CmmLive</span>
<a name="line-60"></a><span class='hs-definition'>middleLiveness</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>gen_kill</span>
<a name="line-61"></a>
<a name="line-62"></a><a name="noLiveOnEntry"></a><span class='hs-comment'>-- | On entry to the procedure, there had better not be any LocalReg's live-in.</span>
<a name="line-63"></a><span class='hs-definition'>noLiveOnEntry</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>BlockId</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CmmLive</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-64"></a><span class='hs-definition'>noLiveOnEntry</span> <span class='hs-varid'>bid</span> <span class='hs-varid'>in_fact</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span>
<a name="line-65"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>isEmptyUniqSet</span> <span class='hs-varid'>in_fact</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>x</span>
<a name="line-66"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>pprPanic</span> <span class='hs-str'>"LocalReg's live-in to graph"</span> <span class='hs-layout'>(</span><span class='hs-varid'>ppr</span> <span class='hs-varid'>bid</span> <span class='hs-varop'><+></span> <span class='hs-varid'>ppr</span> <span class='hs-varid'>in_fact</span><span class='hs-layout'>)</span>
<a name="line-67"></a>
<a name="line-68"></a><a name="gen"></a><span class='hs-comment'>-- | The transfer equations use the traditional 'gen' and 'kill'</span>
<a name="line-69"></a><span class='hs-comment'>-- notations, which should be familiar from the dragon book.</span>
<a name="line-70"></a><span class='hs-definition'>gen</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>UserOfLocalRegs</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'>RegSet</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>RegSet</span>
<a name="line-71"></a><span class='hs-definition'>gen</span> <span class='hs-varid'>a</span> <span class='hs-varid'>live</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldRegsUsed</span> <span class='hs-varid'>extendRegSet</span> <span class='hs-varid'>live</span> <span class='hs-varid'>a</span>
<a name="line-72"></a><a name="kill"></a><span class='hs-definition'>kill</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DefinerOfLocalRegs</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'>RegSet</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>RegSet</span>
<a name="line-73"></a><span class='hs-definition'>kill</span> <span class='hs-varid'>a</span> <span class='hs-varid'>live</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldRegsDefd</span> <span class='hs-varid'>delOneFromUniqSet</span> <span class='hs-varid'>live</span> <span class='hs-varid'>a</span>
<a name="line-74"></a>
<a name="line-75"></a><a name="midLive"></a><span class='hs-definition'>midLive</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Middle</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CmmLive</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CmmLive</span>
<a name="line-76"></a><span class='hs-definition'>midLive</span> <span class='hs-layout'>(</span><span class='hs-conid'>MidForeignCall</span> <span class='hs-layout'>{</span><span class='hs-layout'>}</span><span class='hs-layout'>)</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>emptyUniqSet</span>
<a name="line-77"></a><span class='hs-definition'>midLive</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>live</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>live</span>
<a name="line-78"></a>
<a name="line-79"></a><a name="lastLive"></a><span class='hs-definition'>lastLive</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Last</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>BlockId</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CmmLive</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CmmLive</span>
<a name="line-80"></a><span class='hs-definition'>lastLive</span> <span class='hs-varid'>l</span> <span class='hs-varid'>env</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>last</span> <span class='hs-varid'>l</span>
<a name="line-81"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>last</span> <span class='hs-layout'>(</span><span class='hs-conid'>LastBranch</span> <span class='hs-varid'>id</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>env</span> <span class='hs-varid'>id</span>
<a name="line-82"></a> <span class='hs-varid'>last</span> <span class='hs-layout'>(</span><span class='hs-conid'>LastCall</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>emptyUniqSet</span>
<a name="line-83"></a> <span class='hs-varid'>last</span> <span class='hs-layout'>(</span><span class='hs-conid'>LastCondBranch</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>t</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unionUniqSets</span> <span class='hs-layout'>(</span><span class='hs-varid'>env</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>env</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span>
<a name="line-84"></a> <span class='hs-varid'>last</span> <span class='hs-layout'>(</span><span class='hs-conid'>LastSwitch</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>tbl</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unionManyUniqSets</span> <span class='hs-varop'>$</span> <span class='hs-varid'>map</span> <span class='hs-varid'>env</span> <span class='hs-layout'>(</span><span class='hs-varid'>catMaybes</span> <span class='hs-varid'>tbl</span><span class='hs-layout'>)</span>
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