Hi, I have tried to intercept method calls by enhancing method body. Now I want to intercept field access. I don't know how to do this. Can anyone help me in this regard. Thanks, Ganesh -- -- Man cannot discover new oceans unless he has the courage to lose sight of the shore.
Hi I know how to push Primitive Types on Stack using InstructinoList.append(new PUSH(ConstantPoolGen,343)); Now i want to push Custom Type Object(Obj of some user defined class i.e. Engine Class obj) on Stack in BCEL. thanks
What i want to do is i have a class
class Automobile {
public void getEngine(int carNo,EngineClass engineClassObj){
System.out.println("EngineNo="+engineClassObj.sisNo);
}
}
Now when i load "Automobile" class in memory.
ilist = new InstructionList();
ilist.append(InstructionConstants.ALOAD_0);
ilist.append(new PUSH(pgen,345));
////Hear Now i have to also push the Object on Stack
ilist.append(ifact.createInvoke(_invoking_ClassName,
_invoking_MethodName, Type.INT,
new Type[] { Type.INT,Type.OBJECT }, Constants.INVOKEVIRTUAL));
ilist.append(InstructionConstants.IRETURN);
1-if i use createNew() method and generate new object then how i am going to
fill its fields value?
2-or if i firstly push all fields values of Engine type Obj on Stack using PUSH
then i can some how construct object on memory & then push it on Stack.
these are some solution i can think of.
so still need help...
________________________________
From: Martin von Gagern <Martin.vGagern <at> gmx.net>
(Continue reading)
Am 06.06.11 20:06, schrieb Ganesh Kumar Choudhary: > I have tried to intercept method calls by enhancing method body. Now I want > to intercept field access. I don't know how to do this. Can anyone help me > in this regard. You'll have to modify all classes that do access the field. You can first examine the constant pool of every class, see if it refers to the field (i.e. has a matching ConstantFieldref). If that is the case, you'll have to process the bytecode for each method and insert appropriate function calls before and/or after the field reference. Or, as an alternative, replace the field load with a method call using some BCEL-generated method to wrap the field access.
On 08.06.2011 07:44, Zaree Faryal wrote: > I know how to push Primitive Types on Stack using > InstructinoList.append(new PUSH(ConstantPoolGen,343)); > > Now i want to push Custom Type Object(Obj of some user defined class i.e. Engine > Class obj) on Stack in BCEL. Simply create the object; it will lie on the stack after creation until you do something else with it. Or if you don't want to create it but load it from some "static final" constant, then use GETSTATIC. Martin
On 09.06.2011 08:38, Zaree Faryal wrote:
> What i want to do is i have a class
> class Automobile {
> public void getEngine(int carNo,EngineClass engineClassObj){
> System.out.println("EngineNo="+engineClassObj.sisNo);
> }
> }
>
> /Now when i load "Automobile" class in memory./
> ilist = new InstructionList();
> ilist.append(InstructionConstants.ALOAD_0);
> ilist.append(new PUSH(pgen,345));
> ////Hear Now i have to also push the Object on Stack/
> ilist.append(ifact.createInvoke(_invoking_ClassName,
> _invoking_MethodName, Type.INT,
> new Type[] { Type.INT,Type.OBJECT }, Constants.INVOKEVIRTUAL));
> ilist.append(InstructionConstants.IRETURN);
>
> 1-if i use createNew() method and generate new object then how i am
> going to fill its fields value?
> 2-or if i firstly push all fields values of Engine type Obj on Stack
> using PUSH then i can some how construct object on memory & then push it
> on Stack.
I suggest you formulate how you'd create the object in Java, and then
simply run the resulting class through BCELifier to get an idea of how
the corresponding BCEL code would look like.
http://jakarta.apache.org/bcel/apidocs/org/apache/bcel/util/BCELifier.html
(Continue reading)
HI there I need to dynamically log all read/write access to any variables/objects during class execution in the jvm This is for a phd parallelism research, and i have a strong background in C/java a. Are there any existing code out there ? I played with BCEL to trace some of the opcodes... nice stuff b. Can someone recommend how to add some semantic info from the .class source file ? For example, i would like to know if a certain variable is a for-loop counter Has anyone combined some of the syntax-tree parsers with BCEL ? Thanks for any suggestions or input yazriel atty gmail dotty com
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