Re: how to let asm compute frame automatically?

Hi Hao Zuo
I use the next code to let asm compute frames automatically.
But I still can only  get  FRAME APPEND,  FRAME SAME
            ClassReader cr = new ClassReader(new FileInputStream(file));
            cn = new ClassNode();
            cr.accept(cn, 0);
            ClassWriter cw = new ClassWriter(cr,
ClassWriter.COMPUTE_FRAMES);
            cn.accept(cw);

what I want to get is:
when I analysis source code:    30:  node.key = data;
The corresponding byte code is :
   L1
    LINENUMBER 30 L1
    ALOAD 2
    ILOAD 1
    PUTFIELD SE/BinarySearchTree$Node.key : I
I want to get the def and use information of line 30.
data, the variable at the top of the frame stack is a use, and
node, the variable at  the top-1 of the frame stack is a def, so
this is why I want to get the information about the frame stack.
Is there a convenient way?

2010/8/28 Hao Zuo <[email protected]>

> Hi lucefe,
>
> You would use the COMPUTE_FRAMES flag with ClassWriter when you're done
> with all you transformations. For example:
>
> ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
> cn.accept(cw);
>
> When you get the bytes from the cw, they will represent a class in which
> all the frames have been computed for you.
>
> On Fri, Aug 27, 2010 at 11:14 AM, lucefe <[email protected]> wrote:
>
>> Hi all,
>>
>>     I want to let asm compute frame for me.
>>     I use the tree API to instrument a file, the code is followed:
>>
>>             ClassReader cr = new ClassReader(new FileInputStream(file));
>>             cn = new ClassNode();
>>             cr.accept(cn, 0);
>>
>>    I know from the asm guide that the COMPUTE_FRAMES option of ClassWriter
>>    can let asm compute frame automatically. But how to accomplish it when
>> I use
>>    the tree API?
>>
>>
>> --
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>>
>

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