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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hi Kihong,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I think you should take a look into the Jimple Optimization Pack<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><a href="https://soot-build.cs.uni-paderborn.de/doc/sootoptions/#phase_15">https://soot-build.cs.uni-paderborn.de/doc/sootoptions/#phase_15</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Linghui
<o:p></o:p></span></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></a></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Von:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Soot-list [mailto:soot-list-bounces@CS.McGill.CA]
<b>Im Auftrag von </b>K</span><span lang="DE" style="font-size:11.0pt;font-family:"Calibri",sans-serif">ihong Heo<br>
<b>Gesendet:</b> Montag, 21. August 2017 04:15<br>
<b>An:</b> soot-list@CS.McGill.CA<br>
<b>Betreff:</b> [Soot-list] registers in Jimple<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi Soot users,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Is there any way to optimize the number of registers when translating to Jimple?<o:p></o:p></p>
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<p class="MsoNormal">I run Soot on the Ashes(<a href="http://www.sable.mcgill.ca/ashes/">http://www.sable.mcgill.ca/ashes/</a>) benchmarks. <o:p></o:p></p>
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<p class="MsoNormal">One constructor of a class (symjpack-t/classes/z12.class, I attached) has thousands of registers<o:p></o:p></p>
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<p class="MsoNormal">in Jimple (actually bytecode -> Jimple is not a big problem, only 3 seconds).<o:p></o:p></p>
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<p class="MsoNormal">Consequently it takes very long time (5 minutes) when I transform the Jimple file into Shimple. <o:p></o:p></p>
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<p class="MsoNormal">The bottle neck is the constructor of z12.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I disassembled the constructor (because I couldn’t find the java source file of the class), it looks like:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">/* disassembled JAVA code */<br>
public z12() {<br>
z7[] arrayOfz7 = new z7[1500];<br>
arrayOfz7[0] = new z7("0", 14, null, null, this.z0);<br>
arrayOfz7[1] = new z7(null, 9, arrayOfz7[0], arrayOfz7[0], this.z0);<br>
…<br>
arrayOfz7[1499] = new z7(...);<br>
}<o:p></o:p></p>
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<p class="MsoNormal">This code is translated to <o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">/* Jimple */<br>
public z12() {<br>
r1 = newarray (z7)[1500]; // z7[] arrayOfz7 = new z7[1500];<br>
….<br>
specialinvoke $r6.<init>("0", 14, null, null, $r7); // new z7();<br>
r1[0] = $r6; // arrayOfz7[0] = ...<br>
$r8 = new z7;<br>
$r10 = r1[0];<br>
$r11 = r1[0];<br>
$r9 = r0.z0;<br>
specialinvoke $r8.<init>(null, 9, $r10, $r11, $r9);<br>
r1[1] = $r8; // arrayOfz7[1] = ...<br>
$r12 = new z7;<br>
$r15 = r1[1];<br>
$r13 = r1[0];<br>
$r14 = r0.z0;<br>
….<br>
r1[1499] = …<br>
$r6919 = …<br>
}<o:p></o:p></p>
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<p class="MsoNormal">As you can see, the Jimple file is almost in the form of SSA as it is,<o:p></o:p></p>
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<p class="MsoNormal">so it seems to take a long time because of the large number of registers.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I used the latest Soot with the following command:<o:p></o:p></p>
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<p class="MsoNormal">java -cp soot-trunk.jar soot.Main -cp symjpack-t/classes -pp -f j z12 #for jimple<o:p></o:p></p>
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<p class="MsoNormal">java -cp soot-trunk.jar soot.Main -cp symjpack-t/classes -pp -f j z12 #for shimple<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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