Re: [aspectj-users] Handle Unable to pack method, jump in aspectj

[Krishna Jasty <krishna.jasty@xxxxxxx>]

Thanks Andy,

I will work on the method, which is
bigger in size and causing this error. I can try to split the single big
method into several small pieces.
Meanwhile these exceptions are very
common in my application though the aspectj instrumentation is very small.

 In aspectj source code, where
the details of 2 bytes for IFLE and 4 bytes for GOTO is specified.
 How to wider from the initial
2 bytes to 4 bytes. Can i try any alternative in aspectj front to avoid
this error.

Thanks,
Krishna

From:	Andy Clement <andrew.clement@xxxxxxxxx>
To:	aspectj-users@xxxxxxxxxxx
Date:	09/13/2013 05:14 AM
Subject:	Re: [aspectj-users] Handle Unable to pack method, jump in aspectj
Sent by:	aspectj-users-bounces@xxxxxxxxxxx

---

Hi,

> What
exactly is happening here, can you share more details on how to avoid this. 

The instructions are being reorganized now
that new code has been inserted by AspectJ.  Destinations for branch
targets that moved (probably due to the insertion of advice) are being
recomputed.  If the jump destination is a long way away for some instructions
it is possible to switch to a 'wide' version of the instruction to encode
the 'further' destination (so use 4bytes instead of 2bytes).  If the
instruction was a GOTO we could use a GOTO_W instead. In your case it isn't
a goto, it is IFLE (if less than or equal) and we can't fit the expected
destination into the space we have available to encode the target.

The 'fix' in AspectJ is to dynamically adjust
the IFLE to a nearby branch destination and then use a GOTO_W to get to
the real target, but we haven't had time to implement that.  Basically
you have a big method and you are weaving stuff into it and just pushing
the branches too far apart. Do you need to weave so much into the method
in question? Does any extra exception info tell you the method in question?
I can't recall.

cheers,
Andy



On 11 September 2013 01:36, Krishna Jasty <krishna.jasty@xxxxxxx>
wrote:
Hi, 

When i use the aspectj in our application, i am facing the following exception.
Caused by: java.lang.IllegalStateException: Unable to pack method, jump
(with opcode=158) is too far: 32089 
        at org.aspectj.apache.bcel.generic.InstructionBranch.updatePosition(InstructionBranch.java:176)
        at org.aspectj.apache.bcel.generic.BranchHandle.updatePosition(BranchHandle.java:101)
        at org.aspectj.apache.bcel.generic.InstructionList.setPositions(InstructionList.java:919)
        at org.aspectj.apache.bcel.generic.InstructionList.setPositions(InstructionList.java:863)
        at org.aspectj.apache.bcel.generic.InstructionList.getByteCode(InstructionList.java:981)
        at org.aspectj.apache.bcel.generic.MethodGen.getMethod(MethodGen.java:697)
        ... 68 more 

When i check the aspectj source code, it looks as follows.
 protected int updatePosition(int offset, int max_offset)
  { 
    int i = getTargetOffset(); 

    this.positionOfThisInstruction += offset;

    if ((Math.abs(i) >= 32767 - max_offset) && (this.opcode
!= 201) && (this.opcode != 200)) 
    { 
      if ((this.opcode == 168) || (this.opcode == 167))
{ 
        if (this.opcode == 168)
          this.opcode = 201;
        else { 
          this.opcode = 200;
        } 
        return 2; 
      } 
      throw new IllegalStateException("Unable to pack
method, jump (with opcode=" + this.opcode + ") is too far: "
+ 
        Math.abs(i)); 
    } 

    return 0; 
  } 


Hi Andy, 
What exactly is happening here, can you share more details on how to avoid
this. 
Thanks, 
Krishna
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