From: Rocky Bernstein <rocky.bernstein@...>
Date: 2008-03-31T13:29:07+09:00
Subject: The future of VM::InstructionSequence

------=_Part_24072_21681334.1206937743566
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

A while back in The future of
VM::InstructionSequence<http://www.ruby-forum.com/topic/130587>this
was written:

> and by the way I am thinking of adding and instruction to apply
> patches to bytecode.
>
>
Anybody know what the status of VM::InstructionSequence is?  Currently in
ruby 1.9 debug.rb seems to set a compile option to insert trace statements
inside the instructions. If VM::InstructionSequence goes away, how will
debug.rb work?

Something related to applying patches to bytecode would be a *temporary *patch.
More specifically the "trace" instruction might be applied over an existing
bytecode which would allow for debugging without requiring a special compile
option. Here, what would be needed though is the old bytecode saved and
executed on return from the trace instruction. I'm not completely sure but I
think all of this could be done without needing special support inside the
VM.

Thoughts and comments?

------=_Part_24072_21681334.1206937743566
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

A while back in <a href="http://www.ruby-forum.com/topic/130587">The future of VM::InstructionSequence</a> this was written:<br><blockquote style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;" class="gmail_quote">
<div class="text"><pre>and by the way I am thinking of adding and instruction to apply<br>patches to bytecode.</pre></div></blockquote><div><br>Anybody know what the status of VM::InstructionSequence is?&nbsp; Currently in ruby 1.9 debug.rb seems to set a compile option to insert trace statements inside the instructions. If VM::InstructionSequence goes away, how will debug.rb work? <br>
<br>Something related to applying patches to bytecode would be a <i>temporary </i>patch. More specifically the &quot;trace&quot; instruction might be applied over an existing bytecode which would allow for debugging without requiring a special compile option. Here, what would be needed though is the old bytecode saved and executed on return from the trace instruction. I&#39;m not completely sure but I think all of this could be done without needing special support inside the VM. <br>
<br>Thoughts and comments? <br><br><br>&nbsp;</div>

  <br>

------=_Part_24072_21681334.1206937743566--