Re: Possible stack frame calc dead code bug again!

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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