[Soot-list] need help with method references

[Kevin Dean]

Hi,

I am working on a project for my compiler class which involves  
capturing the "hot path" in a program execution (a trace of basic  
blocks that were called most frequently). My approach so far has been  
to create a bodyTransformer which is part of the "jtp" pack. In the  
bodyTransformer I am getting access to the blocks for that method.  
What I am trying to do is create an external class which accepts  
blocks and adds them to a vector (there is an algorithm here). I want  
to instrument the code so that for every statement that is the head  
of a block, there should be a method reference to my external  
class... and to pass that method the current block. I have seen the  
example on how to do this for a type such as int in the example:

       // 1. first, make a new invoke expression
       InvokeExpr incExpr= Jimple.v().newStaticInvokeExpr 
(increaseCounter.makeRef(),IntConstant.v(1));
       // 2. then, make a invoke statement
       Stmt incStmt = Jimple.v().newInvokeStmt(incExpr);

       // 3. insert new statement into the chain
       //    (we are mutating the unit chain).
       units.insertBefore(incStmt, stmt);

However, I am trying to do something like:
	//this is the class that will maintain the basic blocks
	counterClass    = Scene.v().loadClassAndSupport("MyCounter");
	//this is the method that will accept the basic block
	testBlock = counterClass.getMethod("void setBlock 
(soot.toolkits.graph.Block)");
		//a class which extends BriefUnitGraph and just passes super(body)
       	      SubPathUG sug = new SubPathUG(method.getActiveBody());
		//this class extends BlockGraph and allows access to the basic blocks
	      SubPathBlock sub = new SubPathBlock(sug);
	      blck=sub.getBlocks();
	      it = blck.listIterator();
	
	      while(it.hasNext()){
	    	  Block b = (Block)it.next();
	    	  v.add(b);
	    	  InvokeExpr incExpr= Jimple.v().newStaticInvokeExpr 
(testBlock.makeRef(),v);
	    	  Stmt incStmt = Jimple.v().newInvokeStmt(incExpr);
	      }


I know its failing because v is not a "Value" but a block.... but  
maybe I am not using the right class here? Is InvokeExpr the right  
way to do this? I would appreciate any guidance or sugestions on  
this. Soot seems so overwhelming with all its functionality, I am not  
sure if this is the best way to accomplish what I am trying.

sincerely,
Kevin