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Re: [Help-smalltalk] Questions regarding thisContext

From: Paolo Bonzini
Subject: Re: [Help-smalltalk] Questions regarding thisContext
Date: Mon, 04 Apr 2011 08:22:58 +0200
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On 04/03/2011 04:11 PM, Holger Hans Peter Freyther wrote:

Hi Paolo,

one quick question (can't reproduce the other thing)

thisContext ip: (thisContext ip). Should it work? For me it complains that the
result is no SmallInteger but if I print it it tells it is a SmallInteger? Any
idea how this could happen?


That's correct:

    0:  source line 1
        push Global Variable[0] = ContextPart
    2:  send special message #thisContext
    4:  push Global Variable[0] = ContextPart
    6:  send special message #thisContext
    8:  send selector 1, 0 args = #ip
   10:  send selector 2, 1 args = #ip:
   12:  return stack top

The stack after bytecode 8 is

        thisContext, 10

The stack after bytecode 10 is

        thisContext
So the stack underflows when sending #ip: for the second time. All bets are off with respect to what happens afterwards. 

Paolo
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