Re: Re: Possible stack frame calc dead code bug again!

You are right. But can you replace classwriter with asmifier just for this
class? It wont write bytecode, but you'll get the source code dumped
instead.

  regards,
  Eugene
 On 2011-09-09 5:43 PM, "Charles Oliver Nutter" <[email protected]> wrote:
> Ok, perhaps I reveal my weak knowledge of ASM here, but
> ASMifierClassVisitor doesn't appear to have a constructor that can
> delegate to another visitor. What am I missing?
>
> - Charlie
>
> On Fri, Sep 9, 2011 at 4:04 PM, Eugene Kuleshov <[email protected]>
wrote:
>> Charlie,
>>
>>   You ca just add asmifier visitor before or instead of classwriter into
>> visitor chain.
>>
>>   regards,
>>   Eugene
>>
>> On 2011-09-09 5:02 PM, "Charles Oliver Nutter" <[email protected]>
wrote:
>>> Ok, I guess I'm not clear how to do that. How do I get ASMIfier to
>>> dump something out before I turn it into bytes?
>>>
>>> - Charlie
>>>
>>> On Fri, Sep 9, 2011 at 2:07 PM, Charles Oliver Nutter
>>> <[email protected]> wrote:
>>>> Ok, I'll give it a try.
>>>>
>>>> On Fri, Sep 9, 2011 at 1:27 PM,  <[email protected]> wrote:
>>>>> can you also give the ASMifier code to produce the class, so that we
>>>>> have the original bytecode (i.e. before ClassWriter replaces deadcode
with
>>>>> NOPs)?
>>>>>
>>>>> Eric
>>>>>
>>>>> Charles Oliver Nutter wrote:
>>>>>> Hello everyone, it's your friendly neighborhood compiler writer who
>>>>>> refuses to remove dead code!
>>>>>>
>>>>>> We have a similar case to the previous bug, though this one appears
>>>>>> to
>>>>>> only fail verification on Java 7...not on Java 6.
>>>>>>
>>>>>> The bytecode that fails is shown here:
>>>>>> https://gist.github.com/8899f7b0c7f8cd741ef8
>>>>>>
>>>>>> The error:
>>>>>>
>>>>>> Stack map does not match the one at exception handler 56 in method
>>>>>>
>>>>>>
blah.block_0$RUBY$__file__(Lblah;Lorg/jruby/runtime/ThreadContext;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/Block;)Lorg/jruby/runtime/builtin/IRubyObject;
>>>>>> at offset 29
>>>>>> java.lang.VerifyError: Stack map does not match the one at exception
>>>>>> handler 56 in method
>>>>>>
>>>>>>
blah.block_0$RUBY$__file__(Lblah;Lorg/jruby/runtime/ThreadContext;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/builtin/IRubyObject;Lorg/jruby/runtime/Block;)Lorg/jruby/runtime/builtin/IRubyObject;
>>>>>> at offset 29
>>>>>>
>>>>>> Other than the version number 51 in the class file, the same bytecode
>>>>>> verifies on Java 6. Something got stricter in 7? Something broke?
>>>>>>
>>>>>> I've attached a zip containing the class file and the full output of
>>>>>> dumping the entire class's bytecode.
>>>>>>
>>>>>> This is running on RC1ish (custom build).
>>>>>>
>>>>>> Help?!
>>>>>>
>>>>>> - Charlie
>>>>>>
>>>>>>
>>>>>> --
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>>>>>
>>>>
>>

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