First, let me recommend a book to you that you may already know about: http://java.sun.com/docs/books/vmspec/2nd-edition/html/VMSpecTOC.doc.html
read carefully enough, this book will tell you everything you need to know to screw around with class files to your heart's content.
see below.
Koduru, Rajendra Kumar Reddy wrote: [...]
// code
int i = methodgen.getLocalVariables().length my_lv1 = i+1; my_lv2 = i+2; my_lv = i+3;
// code
and I used to store using il.append ( new ASTORE ( my_lv2 ) );
I encountered a problem with this, i.e. the variable i returned 22, where as the max index is 7.. So there was overlap in the local vars and my class file got corrupted
there is no relationship between number of local variables and the first free slot. each LocalVariable describes the type contained in a slot over a particular range of instructions. there are 0 or more LocalVariables for each slot. You should print out the various fields in your LocalVariables just to get a feel for what they contain, especially the start index, end index and type.
what you want is:
setMaxLocals(); //if you have inserted variables already int i = methodgen.getMaxLocals(); ...
In the project I used to work on (sandmark.cs.arizona.edu), almost every occurrence of getLocalVariables was a bug. That's because the local variable table may be incomplete, inaccurate (to some extent), obfuscated, or just plain missing (MethodGen.removeLocalVariables() or something like that).
I just wanted to know..why is it like that.. Doesn't each local variable have unique index?
Isnt the length (i that is returned) mean the no of local variables in the corresponding method?
However now I tried using
// code
int max_index = 0;
LocalVariableGen[] lv1 = mgen.getLocalVariables(); for(int i = 0; i< lv1.length; i++){
if(lv1[i].getIndex() > max_index) max_index = lv1[i].getIndex(); } my_lv1 = i+1; my_lv2 = i+2; my_lv = i+3; // code
and it works fine..
but I just wanted to clarify it.
Please help me in this regard.
Thank you Reddy
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