1
|
1 |
"
|
|
2 |
COPYRIGHT (c) 1993 by Claus Gittinger
|
|
3 |
All Rights Reserved
|
|
4 |
|
|
5 |
This software is furnished under a license and may be used
|
|
6 |
only in accordance with the terms of that license and with the
|
|
7 |
inclusion of the above copyright notice. This software may not
|
|
8 |
be provided or otherwise made available to, or used by, any
|
|
9 |
other person. No title to or ownership of the software is
|
|
10 |
hereby transferred.
|
|
11 |
"
|
|
12 |
|
|
13 |
Context subclass:#BlockContext
|
|
14 |
instanceVariableNames:'' "do not add instvars here"
|
|
15 |
classVariableNames:''
|
|
16 |
poolDictionaries:''
|
|
17 |
category:'Kernel-Methods'
|
|
18 |
!
|
|
19 |
|
|
20 |
BlockContext comment:'
|
|
21 |
|
|
22 |
COPYRIGHT (c) 1993 by Claus Gittinger
|
|
23 |
All Rights Reserved
|
|
24 |
|
|
25 |
BlockContexts represent the stack context objects of blocks. The layout is the same
|
|
26 |
as for other contexts - this class has been added to avoid a flag in an instance variable.
|
|
27 |
(has become necessary with cheap blocks, which have no home).
|
|
28 |
|
|
29 |
Warning: layout and size known by compiler and runtime system - do not change.
|
|
30 |
|
3
|
31 |
$Header: /cvs/stx/stx/libbasic/BlockContext.st,v 1.3 1993-10-13 00:14:46 claus Exp $
|
1
|
32 |
'!
|
|
33 |
|
|
34 |
!BlockContext methodsFor:'accessing'!
|
|
35 |
|
|
36 |
isBlockContext
|
|
37 |
"return true, iff the receiver is a BlockContext, false otherwise"
|
|
38 |
|
|
39 |
^ true
|
|
40 |
!
|
|
41 |
|
|
42 |
methodHome
|
|
43 |
"return the method-home for block contexts"
|
|
44 |
|
|
45 |
|con h|
|
|
46 |
|
|
47 |
home isNil ifTrue:[^ nil]. "XXX will change soon"
|
|
48 |
home isContext ifFalse:[^ nil]. "copying blocks have no method home"
|
|
49 |
|
|
50 |
con := self.
|
|
51 |
h := home.
|
|
52 |
[h notNil] whileTrue:[
|
|
53 |
con := h.
|
|
54 |
h := con home
|
|
55 |
].
|
|
56 |
^ con
|
|
57 |
!
|
|
58 |
|
|
59 |
home
|
|
60 |
"return the immediate home of the receiver.
|
|
61 |
normally this is the methodcontext, where the block was created,
|
|
62 |
for nested block contexts, this is the surrounding blocks context."
|
|
63 |
|
|
64 |
home isContext ifFalse:[^ nil]. "copying blocks have no home"
|
|
65 |
^ home
|
|
66 |
!
|
|
67 |
|
|
68 |
selector
|
|
69 |
"return the selector of the context - which is one of the value
|
|
70 |
selectors"
|
|
71 |
|
|
72 |
|nargs|
|
|
73 |
|
|
74 |
nargs := self nargs.
|
|
75 |
(nargs == 0) ifTrue:[^ #value].
|
|
76 |
(nargs == 1) ifTrue:[^ #value:].
|
|
77 |
(nargs == 2) ifTrue:[^ #value:value:].
|
|
78 |
(nargs == 3) ifTrue:[^ #value:value:value:].
|
|
79 |
(nargs == 4) ifTrue:[^ #value:value:value:value:].
|
|
80 |
(nargs == 5) ifTrue:[^ #value:value:value:value:value:].
|
|
81 |
^ nil
|
|
82 |
! !
|
|
83 |
|
|
84 |
!BlockContext methodsFor:'printing'!
|
|
85 |
|
|
86 |
receiverPrintString
|
|
87 |
home isNil ifTrue:[
|
|
88 |
^ '[] optimized'
|
|
89 |
].
|
|
90 |
home isContext ifFalse:[
|
|
91 |
"a copying block"
|
|
92 |
|
|
93 |
"receiverClassName := home selfValue class name."
|
|
94 |
^ '[] optimized'
|
|
95 |
].
|
|
96 |
|
|
97 |
^ '[] in ' , receiver class name , '-' , self methodHome selector
|
|
98 |
!
|
|
99 |
|
|
100 |
printReceiver
|
|
101 |
self receiverPrintString print
|
|
102 |
!
|
|
103 |
|
|
104 |
printString
|
|
105 |
^ self receiverPrintString , ' ' , self selector printString
|
|
106 |
! !
|