Hi David,
Interesting! To my mind that definition is incorrect. I would expect the sender of a block to be the sender of the enclosing method, in which case the definition would arguably be
BlockClosure methods for accessing
sender
^self home sender
A block activation's caller would be it's sender slot, so within a block you might refer to thisContext caller. But what is arguably a bug in my implementation is that within a block activation thisContext sender refers to the caller (the sender of value: to the activation's block) not to the sender of the enclosing method.
I think I may have screwed up badly here and that the correct implementations should be
MethodContext methods for accessing
caller
^closureOrNil
ifNil: [self error: 'this is a method activation and so has no caller']
ifNotNil: [sender]
sender
^closureOrNil
ifNil: [sender]
ifNotNil: [closureOrNil outerContext sender]
BlockClosure methods for accessing
sender
^outerContext sender
and either
BlockClosure methods for accessing
caller
"Since a BlockClosure is by definition not an activation it does not have a caller.
It has a sender because it is always created within the context of a method."
^nil
or
BlockClosure methods for accessing
caller
^self error: 'this is an inactive block and so has no caller'
I believe the pre-closure definitions are
ContextPart methods for accessingsender
^sender
BlockContext methods for accessing
caller ^sender
which to my mind is missing
BlockContext methods for accessing
sender ^home sender
What do people think the right definitions should be?
David T. Lewis uploaded a new version of Kernel to project The Trunk:
http://source.squeak.org/trunk/Kernel-dtl.331.mcz
==================== Summary ====================
Name: Kernel-dtl.331
Author: dtl
Time: 18 December 2009, 11:32:44 am
UUID: 20ffffda-86bc-47a7-8eae-cd11b55aa65e
Ancestors: Kernel-bs.330
Add BlockClosure>>sender required for MessageTally class>>tallySends:
Harvested from Pharo (nice 4/14/2009 19:09).
=============== Diff against Kernel-bs.330 ===============
Item was added:
+ ----- Method: BlockClosure>>sender (in category 'debugger access') -----
+ sender
+ "Answer the context that sent the message that created the receiver."
+
+ ^outerContext sender!
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