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<p>Hi Bernhard,<br>
<br>
I am quite new to Soot so this may sound very silly. <br>
<br>
If I want to instrument this code:<br>
FileOutputStream writer=new FileOutputStream("file.txt");<br>
<br>
The jimple representation is:<br>
java.io.FileOutputStream $r6;<br>
$r6 = new java.io.FileOutputStream;<br>
specialinvoke $r6.<java.io.FileOutputStream: void <init>(java.lang.String)>("file.txt");<br>
<br>
Now to do this I write my code as:<br>
final Local fileLocal=Jimple.v().newLocal("writing",RefType.v("java.io.FileOutputStream"));<br>
body.getLocals().add(fileLocal);<br>
<br>
//What is the code for creating $r6 = new java.io.FileOutputStream;</p>
<div>units .insertBefore(Jimple.v() .newInvokeStmt(Jimple.v().newSpecialInvokeExpr(fileLocal, Scene.v() .getMethod("java.io.FileOutputStream: void <init>(java.lang.String)").makeRef( StringConstant.v("file.txt"))),stmt);</div>
<p>I am not able to create the "new FileOutputStream", when I create using newInstanceFieldRef it somehow throws error. Can you tell me what exactly is the code to use here.<br>
<br>
Thanks,<br>
Pallavi<br>
 </p>
<p><br>
<br>
<br>
Quoting Bernhard Berger <<a href="mailto:berber@tzi.de">berber@tzi.de</a>>:</p>
<blockquote style="border-left:2px solid blue;margin-left:2px;padding-left:12px;" type="cite">
<p>Hi Pallavi,</p>
<div> </div>
<div>is the exception thrown by Soot or by the application you are instrumenting? I think you forgot to call the new operator. If you take a look at some Jimple code you will see that for object creation there will be a JNewExpr (the result will be assigned to you local) and afterwards you are going to call the constructor.</div>
<div> </div>
<div>Regards, Bernhard</div>
<div><br>
<div>
<blockquote type="cite">
<div>Am 12.01.2017 um 11:41 schrieb Pallavi Majumder <<a href="mailto:s8pamaju@stud.uni-saarland.de">s8pamaju@stud.uni-saarland.de</a>>:</div>
<br class="Apple-interchange-newline">
<div> </div>
</blockquote>
</div>
</div>
</blockquote>
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<p>Hi All,<br>
<br>
I want to instrument the below code using soot:<br>
<br>
PrintStream writing=new PrintStream(new FileOutputStream("file.txt"));<br>
<br>
So I thought I'll start with creating the FileOutputStream object first.<br>
<br>
Soot Code:</p>
<div>final Local fileLocal=Jimple.v().newLocal("writing",</div>
<div>RefType.v("java.io.FileOutputStream"));<br>
body.getLocals().add(fileLocal);<br>
<div>units</div>
<div>.insertBefore(Jimple.v()</div>
<div>.newInvokeStmt(Jimple.v()</div>
<div>.newSpecialInvokeExpr(fileLocal, Scene.v()</div>
<div>.getMethod("<java.io.FileOutputStream: void <init>(java.lang.String)").makeRef(),</div>
<div>StringConstant.v("file.txt"))),stmt);<br>
<br>
When I run this it gives the exception:<br>
Worker thread execution failed: oops <java.io.FileOutputStream: void <init>(java.lang.String)</div>
</div>
<p><br>
<br>
Does anyone know a solution to this?<br>
<br>
Thanks,<br>
Pallavi</p>
</div>
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