Re: Accessing methods called from within methods

Steve Sevik wrote:

>Hello, 
> 
>I'm a new user of BCEL. I am trying to get access to methods called from within methods. I tried all possible classes that I could think of, but in vain. Can somebody help me out please ?
> 
>My Class 'myClass' has two methods A, B ; and the main method calls method A which in turn calls method B, I was able to get the main method and print its code using the following code:
> 
>JavaClass clazz = Repository.lookupClass(myClass);
>Method[] methods = clazz.getMethods();
>for(int i=0; i < methods.length; i++){
>    if("main".equals(methods[i].getName())){
>        Code code = methods[i].getCode();
>        System.out.println(code.toString());
>    }
>}
> 
>How can I get access to method A from within main ?
>I want to print out the fact that main calls method A.
>Then get access to method A's code from there and print out the fact that it calls method B.
>  
>

import org.apache.bcel.Constants;
import org.apache.bcel.generic.*;

ClassGen classGen = new ClassGen(clazz);
MethodGen methodGen = new MethodGen(methods[i], clazz.getClassName(), 
classGen.getConstantPool());
InstructionList il = methodGen.getInstructionList();
for (Iterator i = il.iterator(); i.hasNext(); ) {
    InstructionHandle handle = (InstructionHandle) i.next();
    if (handle.getInstruction() instanceof InvokeInstruction) {
       InvokeInstruction invokeInstruction = (InvokeInstruction) 
handle.getInstruction();
       String calledClass = 
invokeInstruction.getClassName(classGen.getConstantPool());
       String calledMethodName = 
invokeInstruction.getName(classGen.getConstantPool());
       String calledMethodSignature = 
invokeInstruction.getSignature(classGen.getConstantPool());
       boolean isStaticMethod = invokeInstruction.getOpcode() == 
Constants.INVOKESTATIC;

       // now you can check to see if the method called is the one you want
    }
}

-Dave