This file is indexed.

/usr/share/gnu-smalltalk/kernel/IdentitySet.st is in gnu-smalltalk-common 3.2.4-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
"======================================================================
|
|   IdentitySet Method Definitions
|
|
 ======================================================================"

"======================================================================
|
| Copyright 1999, 2000, 2001 Free Software Foundation, Inc.
| Written by Paolo Bonzini.
|
| This file is part of the GNU Smalltalk class library.
|
| The GNU Smalltalk class library is free software; you can redistribute it
| and/or modify it under the terms of the GNU Lesser General Public License
| as published by the Free Software Foundation; either version 2.1, or (at
| your option) any later version.
| 
| The GNU Smalltalk class library is distributed in the hope that it will be
| useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
| General Public License for more details.
| 
| You should have received a copy of the GNU Lesser General Public License
| along with the GNU Smalltalk class library; see the file COPYING.LIB.
| If not, write to the Free Software Foundation, 59 Temple Place - Suite
| 330, Boston, MA 02110-1301, USA.  
|
 ======================================================================"



Set subclass: IdentitySet [
    
    <shape: #pointer>
    <category: 'Collections-Unordered'>
    <comment: 'I am the typical set object; I can store any objects uniquely.  I
use the == operator to determine duplication of objects.'>

    identityIncludes: anObject [
	"Answer whether we include the anObject object; for IdentitySets
	 this is identical to #includes:"

	<category: 'testing'>
	^self includes: anObject
    ]

    hashFor: anObject [
	"Return an hash value for the item, anObject"

	<category: 'private methods'>
	^anObject identityHash
    ]

    findIndex: anObject [
	"Tries to see if anObject exists as an indexed variable. As soon as nil
	 or anObject is found, the index of that slot is answered"

	<category: 'private methods'>
	| index size element |
	self beConsistent.

	"Sorry for the lack of readability, but I want speed... :-)"
	index := (anObject identityHash scramble 
		    bitAnd: (size := self primSize) - 1) + 1.
	
	[((element := self primAt: index) isNil or: [element == anObject]) 
	    ifTrue: [^index].
	index == size ifTrue: [index := 1] ifFalse: [index := index + 1]] 
		repeat
    ]
]