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<pre><a name="line-1"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Lava</span><span class='hs-varop'>.</span><span class='hs-conid'>SequentialConstructive</span>
<a name="line-2"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>simulateCon</span>
<a name="line-3"></a> <span class='hs-layout'>)</span>
<a name="line-4"></a> <span class='hs-keyword'>where</span>
<a name="line-5"></a>
<a name="line-6"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Lava</span><span class='hs-varop'>.</span><span class='hs-conid'>Ref</span>
<a name="line-7"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Lava</span><span class='hs-varop'>.</span><span class='hs-conid'>Signal</span>
<a name="line-8"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Lava</span><span class='hs-varop'>.</span><span class='hs-conid'>Netlist</span>
<a name="line-9"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Lava</span><span class='hs-varop'>.</span><span class='hs-conid'>Sequent</span>
<a name="line-10"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Lava</span><span class='hs-varop'>.</span><span class='hs-conid'>Generic</span>
<a name="line-11"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Lava</span><span class='hs-varop'>.</span><span class='hs-conid'>Error</span>
<a name="line-12"></a>
<a name="line-13"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>IORef</span>
<a name="line-14"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Unsafe</span>
<a name="line-15"></a>
<a name="line-16"></a><span class='hs-comment'>----------------------------------------------------------------</span>
<a name="line-17"></a><span class='hs-comment'>-- wire datatype</span>
<a name="line-18"></a>
<a name="line-19"></a><a name="Time"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>Time</span>
<a name="line-20"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IORef</span> <span class='hs-conid'>()</span>
<a name="line-21"></a>
<a name="line-22"></a><a name="Timed"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Timed</span> <span class='hs-varid'>a</span>
<a name="line-23"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span> <span class='hs-varop'>`At`</span> <span class='hs-conid'>Time</span>
<a name="line-24"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Uninitialized</span>
<a name="line-25"></a>
<a name="line-26"></a><a name="Wire"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Wire</span>
<a name="line-27"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Wire</span>
<a name="line-28"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>components</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Component</span><span class='hs-keyglyph'>]</span>
<a name="line-29"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>value</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Timed</span> <span class='hs-layout'>(</span><span class='hs-conid'>S</span> <span class='hs-conid'>Symbol</span><span class='hs-layout'>)</span>
<a name="line-30"></a> <span class='hs-layout'>}</span>
<a name="line-31"></a>
<a name="line-32"></a><a name="Component"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>Component</span>
<a name="line-33"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Time</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-34"></a>
<a name="line-35"></a><span class='hs-comment'>----------------------------------------------------------------</span>
<a name="line-36"></a><span class='hs-comment'>-- simulate</span>
<a name="line-37"></a>
<a name="line-38"></a><a name="simulateCon"></a><span class='hs-definition'>simulateCon</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Generic</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Generic</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>b</span><span class='hs-keyglyph'>]</span>
<a name="line-39"></a><span class='hs-definition'>simulateCon</span> <span class='hs-varid'>circ</span> <span class='hs-varid'>inps</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unsafePerformIO</span> <span class='hs-varop'>$</span>
<a name="line-40"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>micro</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newSet</span>
<a name="line-41"></a> <span class='hs-varid'>macro</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newSet</span>
<a name="line-42"></a> <span class='hs-varid'>time0</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newIORef</span> <span class='hs-conid'>()</span>
<a name="line-43"></a>
<a name="line-44"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>new</span> <span class='hs-keyglyph'>=</span>
<a name="line-45"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>rwire</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newIORef</span> <span class='hs-layout'>(</span><span class='hs-conid'>Wire</span><span class='hs-layout'>{</span> <span class='hs-varid'>components</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span><span class='hs-layout'>,</span> <span class='hs-varid'>value</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Uninitialized</span> <span class='hs-layout'>}</span><span class='hs-layout'>)</span>
<a name="line-46"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>rwire</span>
<a name="line-47"></a>
<a name="line-48"></a> <span class='hs-varid'>define</span> <span class='hs-varid'>rwire</span> <span class='hs-layout'>(</span><span class='hs-conid'>DelayBool</span> <span class='hs-varid'>init</span> <span class='hs-varid'>next</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-49"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>delay</span> <span class='hs-varid'>rwire</span> <span class='hs-varid'>init</span> <span class='hs-varid'>next</span>
<a name="line-50"></a>
<a name="line-51"></a> <span class='hs-varid'>define</span> <span class='hs-varid'>rwire</span> <span class='hs-layout'>(</span><span class='hs-conid'>DelayInt</span> <span class='hs-varid'>init</span> <span class='hs-varid'>next</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-52"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>delay</span> <span class='hs-varid'>rwire</span> <span class='hs-varid'>init</span> <span class='hs-varid'>next</span>
<a name="line-53"></a>
<a name="line-54"></a> <span class='hs-varid'>define</span> <span class='hs-varid'>rwire</span> <span class='hs-varid'>sym</span> <span class='hs-keyglyph'>=</span>
<a name="line-55"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>arguments</span> <span class='hs-varid'>sym</span> <span class='hs-keyword'>of</span>
<a name="line-56"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>addSet</span> <span class='hs-varid'>macro</span> <span class='hs-varid'>constant</span>
<a name="line-57"></a> <span class='hs-varid'>args</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>sequence_</span> <span class='hs-keyglyph'>[</span> <span class='hs-varid'>compWire</span> <span class='hs-varid'>rarg</span> <span class='hs-varid'>propagate</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>rarg</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>args</span> <span class='hs-keyglyph'>]</span>
<a name="line-58"></a> <span class='hs-keyword'>where</span>
<a name="line-59"></a> <span class='hs-varid'>propagate</span> <span class='hs-varid'>time</span> <span class='hs-keyglyph'>=</span>
<a name="line-60"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>sym'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mmap</span> <span class='hs-layout'>(</span><span class='hs-varop'>`valueWire`</span> <span class='hs-varid'>time</span><span class='hs-layout'>)</span> <span class='hs-varid'>sym</span>
<a name="line-61"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>evalLazy</span> <span class='hs-varid'>sym'</span> <span class='hs-keyword'>of</span>
<a name="line-62"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-63"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>updateWire</span> <span class='hs-varid'>rwire</span> <span class='hs-varid'>time</span> <span class='hs-varid'>v</span>
<a name="line-64"></a>
<a name="line-65"></a> <span class='hs-varid'>constant</span> <span class='hs-varid'>time</span> <span class='hs-keyglyph'>=</span>
<a name="line-66"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>propagate</span> <span class='hs-varid'>time</span>
<a name="line-67"></a> <span class='hs-varid'>addSet</span> <span class='hs-varid'>macro</span> <span class='hs-varid'>constant</span>
<a name="line-68"></a>
<a name="line-69"></a> <span class='hs-varid'>delay</span> <span class='hs-varid'>rwire</span> <span class='hs-varid'>init</span> <span class='hs-varid'>next</span> <span class='hs-keyglyph'>=</span>
<a name="line-70"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>compWire</span> <span class='hs-varid'>next</span> <span class='hs-varid'>nextState</span>
<a name="line-71"></a> <span class='hs-varid'>compWire</span> <span class='hs-varid'>init</span> <span class='hs-varid'>initState</span>
<a name="line-72"></a> <span class='hs-keyword'>where</span>
<a name="line-73"></a> <span class='hs-varid'>nextState</span> <span class='hs-varid'>time</span> <span class='hs-keyglyph'>=</span>
<a name="line-74"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>mv</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>valueWire</span> <span class='hs-varid'>next</span> <span class='hs-varid'>time</span>
<a name="line-75"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>mv</span> <span class='hs-keyword'>of</span>
<a name="line-76"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-77"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>addSet</span> <span class='hs-varid'>macro</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>updateWire</span> <span class='hs-varid'>rwire</span> <span class='hs-varid'>t</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span>
<a name="line-78"></a>
<a name="line-79"></a> <span class='hs-varid'>initState</span> <span class='hs-varid'>time</span>
<a name="line-80"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>time</span> <span class='hs-varop'>==</span> <span class='hs-varid'>time0</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>mv</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>valueWire</span> <span class='hs-varid'>init</span> <span class='hs-varid'>time</span>
<a name="line-81"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>mv</span> <span class='hs-keyword'>of</span>
<a name="line-82"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-83"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>updateWire</span> <span class='hs-varid'>rwire</span> <span class='hs-varid'>time</span> <span class='hs-varid'>v</span>
<a name="line-84"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-85"></a>
<a name="line-86"></a> <span class='hs-varid'>compWire</span> <span class='hs-varid'>rwire</span> <span class='hs-varid'>comp</span> <span class='hs-keyglyph'>=</span>
<a name="line-87"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>wire</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readIORef</span> <span class='hs-varid'>rwire</span>
<a name="line-88"></a> <span class='hs-varid'>writeIORef</span> <span class='hs-varid'>rwire</span> <span class='hs-layout'>(</span><span class='hs-varid'>wire</span><span class='hs-layout'>{</span> <span class='hs-varid'>components</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>comp</span> <span class='hs-conop'>:</span> <span class='hs-varid'>components</span> <span class='hs-varid'>wire</span> <span class='hs-layout'>}</span><span class='hs-layout'>)</span>
<a name="line-89"></a>
<a name="line-90"></a> <span class='hs-varid'>valueWire</span> <span class='hs-varid'>rwire</span> <span class='hs-varid'>time</span> <span class='hs-keyglyph'>=</span>
<a name="line-91"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>wire</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readIORef</span> <span class='hs-varid'>rwire</span>
<a name="line-92"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span>
<a name="line-93"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>value</span> <span class='hs-varid'>wire</span> <span class='hs-keyword'>of</span>
<a name="line-94"></a> <span class='hs-varid'>v</span> <span class='hs-varop'>`At`</span> <span class='hs-varid'>time'</span>
<a name="line-95"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>time</span> <span class='hs-varop'>==</span> <span class='hs-varid'>time'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>v</span>
<a name="line-96"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-97"></a>
<a name="line-98"></a> <span class='hs-varid'>actualValueWire</span> <span class='hs-varid'>rwire</span> <span class='hs-varid'>time</span> <span class='hs-keyglyph'>=</span>
<a name="line-99"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>mv</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>valueWire</span> <span class='hs-varid'>rwire</span> <span class='hs-varid'>time</span>
<a name="line-100"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>mv</span> <span class='hs-keyword'>of</span>
<a name="line-101"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>v</span>
<a name="line-102"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>wrong</span> <span class='hs-conid'>Lava</span><span class='hs-varop'>.</span><span class='hs-conid'>Error</span><span class='hs-varop'>.</span><span class='hs-conid'>UndefinedWire</span>
<a name="line-103"></a>
<a name="line-104"></a> <span class='hs-varid'>updateWire</span> <span class='hs-varid'>rwire</span> <span class='hs-varid'>time</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span>
<a name="line-105"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>wire</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readIORef</span> <span class='hs-varid'>rwire</span>
<a name="line-106"></a> <span class='hs-varid'>mv</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>valueWire</span> <span class='hs-varid'>rwire</span> <span class='hs-varid'>time</span>
<a name="line-107"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>mv</span> <span class='hs-keyword'>of</span>
<a name="line-108"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>v'</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>v</span> <span class='hs-varop'>=/=</span> <span class='hs-varid'>v'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>wrong</span> <span class='hs-conid'>Lava</span><span class='hs-varop'>.</span><span class='hs-conid'>Error</span><span class='hs-varop'>.</span><span class='hs-conid'>BadCombinationalLoop</span>
<a name="line-109"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-110"></a>
<a name="line-111"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-varid'>writeIORef</span> <span class='hs-varid'>rwire</span> <span class='hs-layout'>(</span><span class='hs-varid'>wire</span><span class='hs-layout'>{</span> <span class='hs-varid'>value</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>v</span> <span class='hs-varop'>`At`</span> <span class='hs-varid'>time</span> <span class='hs-layout'>}</span><span class='hs-layout'>)</span>
<a name="line-112"></a> <span class='hs-varid'>sequence_</span> <span class='hs-keyglyph'>[</span> <span class='hs-varid'>addSet</span> <span class='hs-varid'>micro</span> <span class='hs-varid'>comp</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>comp</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>components</span> <span class='hs-varid'>wire</span> <span class='hs-keyglyph'>]</span>
<a name="line-113"></a>
<a name="line-114"></a> <span class='hs-conid'>Bool</span> <span class='hs-varid'>b1</span> <span class='hs-varop'>=/=</span> <span class='hs-conid'>Bool</span> <span class='hs-varid'>b2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>b1</span> <span class='hs-varop'>/=</span> <span class='hs-varid'>b2</span>
<a name="line-115"></a> <span class='hs-conid'>Int</span> <span class='hs-varid'>n1</span> <span class='hs-varop'>=/=</span> <span class='hs-conid'>Int</span> <span class='hs-varid'>n2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>n1</span> <span class='hs-varop'>/=</span> <span class='hs-varid'>n2</span>
<a name="line-116"></a> <span class='hs-keyword'>_</span> <span class='hs-varop'>=/=</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-117"></a>
<a name="line-118"></a> <span class='hs-varid'>sr</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>netlistIO</span> <span class='hs-varid'>new</span> <span class='hs-varid'>define</span> <span class='hs-layout'>(</span><span class='hs-varid'>struct</span> <span class='hs-layout'>(</span><span class='hs-varid'>circ</span> <span class='hs-layout'>(</span><span class='hs-varid'>input</span> <span class='hs-varid'>inps</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-119"></a>
<a name="line-120"></a> <span class='hs-varid'>outs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>timedLazyLoop</span> <span class='hs-varid'>time0</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>time</span> <span class='hs-keyglyph'>-></span>
<a name="line-121"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>emptySet</span> <span class='hs-varid'>macro</span> <span class='hs-layout'>(</span><span class='hs-varop'>$</span> <span class='hs-varid'>time</span><span class='hs-layout'>)</span>
<a name="line-122"></a> <span class='hs-varid'>while</span> <span class='hs-layout'>(</span><span class='hs-varid'>emptySet</span> <span class='hs-varid'>micro</span> <span class='hs-layout'>(</span><span class='hs-varop'>$</span> <span class='hs-varid'>time</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-123"></a> <span class='hs-varid'>s</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mmap</span> <span class='hs-layout'>(</span><span class='hs-varop'>`actualValueWire`</span> <span class='hs-varid'>time</span><span class='hs-layout'>)</span> <span class='hs-varid'>sr</span>
<a name="line-124"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>construct</span> <span class='hs-layout'>(</span><span class='hs-varid'>symbol</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-125"></a>
<a name="line-126"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>res</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>takes</span> <span class='hs-varid'>inps</span> <span class='hs-varid'>outs</span>
<a name="line-127"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>res</span>
<a name="line-128"></a>
<a name="line-129"></a><span class='hs-comment'>----------------------------------------------------------------</span>
<a name="line-130"></a><span class='hs-comment'>-- helper functions</span>
<a name="line-131"></a>
<a name="line-132"></a><a name="newSet"></a><span class='hs-definition'>newSet</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>IORef</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-133"></a><span class='hs-definition'>newSet</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>newIORef</span> <span class='hs-conid'>[]</span>
<a name="line-134"></a>
<a name="line-135"></a><a name="addSet"></a><span class='hs-definition'>addSet</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IORef</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-136"></a><span class='hs-definition'>addSet</span> <span class='hs-varid'>rset</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span>
<a name="line-137"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readIORef</span> <span class='hs-varid'>rset</span>
<a name="line-138"></a> <span class='hs-varid'>writeIORef</span> <span class='hs-varid'>rset</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span>
<a name="line-139"></a>
<a name="line-140"></a><a name="emptySet"></a><span class='hs-definition'>emptySet</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IORef</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Bool</span>
<a name="line-141"></a><span class='hs-definition'>emptySet</span> <span class='hs-varid'>rset</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>=</span>
<a name="line-142"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readIORef</span> <span class='hs-varid'>rset</span>
<a name="line-143"></a> <span class='hs-varid'>writeIORef</span> <span class='hs-varid'>rset</span> <span class='hs-conid'>[]</span>
<a name="line-144"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>xs</span> <span class='hs-keyword'>of</span>
<a name="line-145"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-varid'>return</span> <span class='hs-conid'>False</span>
<a name="line-146"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-varid'>sequence</span> <span class='hs-keyglyph'>[</span> <span class='hs-varid'>action</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>]</span>
<a name="line-147"></a> <span class='hs-varid'>return</span> <span class='hs-conid'>True</span>
<a name="line-148"></a>
<a name="line-149"></a><a name="while"></a><span class='hs-definition'>while</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-conid'>Bool</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-150"></a><span class='hs-definition'>while</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span>
<a name="line-151"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>m</span>
<a name="line-152"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>b</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>while</span> <span class='hs-varid'>m</span>
<a name="line-153"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-154"></a>
<a name="line-155"></a><a name="timedLazyLoop"></a><span class='hs-definition'>timedLazyLoop</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Time</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Time</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-156"></a><span class='hs-definition'>timedLazyLoop</span> <span class='hs-varid'>t</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span>
<a name="line-157"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>m</span> <span class='hs-varid'>t</span>
<a name="line-158"></a> <span class='hs-varid'>t'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newIORef</span> <span class='hs-conid'>()</span>
<a name="line-159"></a> <span class='hs-keyword'>as</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>unsafeInterleaveIO</span> <span class='hs-layout'>(</span><span class='hs-varid'>timedLazyLoop</span> <span class='hs-varid'>t'</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-160"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-conop'>:</span><span class='hs-keyword'>as</span><span class='hs-layout'>)</span>
<a name="line-161"></a>
<a name="line-162"></a><a name="input"></a><span class='hs-definition'>input</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Generic</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-163"></a><span class='hs-definition'>input</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>out</span>
<a name="line-164"></a> <span class='hs-keyword'>where</span>
<a name="line-165"></a> <span class='hs-varid'>out</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldr</span> <span class='hs-varid'>delay</span> <span class='hs-varid'>out</span> <span class='hs-varid'>xs</span>
<a name="line-166"></a>
<a name="line-167"></a><a name="takes"></a><span class='hs-definition'>takes</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>b</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>b</span><span class='hs-keyglyph'>]</span>
<a name="line-168"></a><span class='hs-definition'>takes</span> <span class='hs-conid'>[]</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-169"></a><span class='hs-definition'>takes</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>y</span><span class='hs-conop'>:</span><span class='hs-varid'>ys</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>y</span> <span class='hs-conop'>:</span> <span class='hs-varid'>takes</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>ys</span>
<a name="line-170"></a>
<a name="line-171"></a><span class='hs-comment'>----------------------------------------------------------------</span>
<a name="line-172"></a><span class='hs-comment'>-- the end.</span>
<a name="line-173"></a>
</pre></body>
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