/usr/share/gnu-smalltalk/kernel/Autoload.st is in gnu-smalltalk-common 3.2.5-1.1.
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 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 | "======================================================================
|
| File autoloading mechanism
|
|
======================================================================"
"======================================================================
|
| Copyright 1991,1992,94,95,99,2000,2001,2002,2008
| Free Software Foundation, Inc.
| Written by Steve Byrne.
|
| 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.
|
======================================================================"
Kernel.PackageInfo extend [
autoload [
<category: 'private-autoloading'>
self fileIn
]
]
FilePath extend [
autoload [
<category: 'private-autoloading'>
self withReadStreamDo: [:rs | rs fileIn ]
]
]
Namespace current: Kernel [
nil subclass: AutoloadClass [
"Warning: instance variable indices appear below in #class:in:from:"
| superClass methodDictionary instanceSpec subClasses instanceVariables environment name loader |
<comment: 'I represent the metaclass of an autoloaded class before it is autoloaded.
Having a proxy for the metaclass as well allows one to send messages to
the metaclass (such as #methodsFor: to extend it with class-side methods)
and have the class autoloaded.'>
<category: 'Examples-Useful tools'>
AutoloadClass class >> class: nameSymbol in: aNamespace loader: anObject [
| autoload behavior newClass |
"Create the metaclass and its sole instance"
behavior := Behavior new superclass: Autoload.
"Turn the metaclass into an instance of AutoloadClass. To do
this we create a `prototype' in the form of an array..."
newClass := Array new: Kernel.AutoloadClass allInstVarNames size.
1 to: behavior class instSize
do: [:i | newClass at: i put: (behavior instVarAt: i)].
newClass
at: 6 put: aNamespace;
at: 7 put: nameSymbol;
at: 8 put: anObject.
"... and change its class magically after it is initialized."
newClass changeClassTo: Kernel.AutoloadClass.
"Now create the instance. We go through some hops because of
the very limited set of messages that these classes know
about."
autoload := behavior new.
behavior become: newClass.
^autoload
]
name [
"Answer the name of the class to be autoloaded"
<category: 'accessing'>
^name
]
environment [
"Answer the namespace in which the class will be autoloaded"
<category: 'accessing'>
^environment
]
doesNotUnderstand: aMessage [
"Load the class and resend the message to its metaclass."
<category: 'accessing'>
^aMessage reinvokeFor: self loadedMetaclass_
]
loadedMetaclass_ [
"File-in the file and answer the metaclass for the new value of the
association which held the receiver"
<category: 'accessing'>
^self loadedClass_ class
]
loadedClass_ [
"File-in the file and answer the new value of the association which
held the receiver"
<category: 'accessing'>
| class saveLoader |
loader isNil
ifFalse:
[saveLoader := loader.
loader := nil.
environment at: name put: nil.
saveLoader autoload].
class := environment at: name ifAbsent: [nil].
class isNil ifTrue: [
^Autoload error: '%1 should have defined class %2.%3 but didn''t'
% {saveLoader. environment. name asString}].
^class
]
]
]
nil subclass: Autoload [
<comment: 'I am not a part of the normal Smalltalk kernel class system. I provide the
ability to do late ("on-demand") loading of class definitions. Through me,
you can define any class to be loaded when any message is sent to
the class itself (such as to create an instance) or to its metaclass (such
as #methodsFor: to extend it with class-side methods).'>
<category: 'Examples-Useful tools'>
Autoload class >> class: nameSymbol from: fileNameString [
"Make Smalltalk automatically load the class named nameSymbol
from fileNameString when needed"
<category: 'instance creation'>
^self
class: nameSymbol
in: Namespace current
from: fileNameString
]
Autoload class >> class: nameSymbol loader: anObject [
"Make Smalltalk automatically load the class named nameSymbol.
When the class is needed, anObject will be sent #autoload.
By default, instances of FilePath and Package can be used."
<category: 'instance creation'>
^self
class: nameSymbol
in: Namespace current
loader: anObject
]
Autoload class >> class: nameSymbol in: aNamespace from: fileNameString [
"Make Smalltalk automatically load the class named nameSymbol
and residing in aNamespace from fileNameString when needed"
<category: 'instance creation'>
| file |
"Check if the file exists."
file := fileNameString asFile.
file withReadStreamDo: [ :rs | ].
"Turn the metaclass into an instance of AutoloadClass. To do
this we create a `prototype' in the form of an array and then..."
^self class: nameSymbol in: aNamespace loader: file
]
Autoload class >> class: nameSymbol in: aNamespace loader: anObject [
"Make Smalltalk automatically load the class named nameSymbol
and residing in aNamespace. When the class is needed, anObject
will be sent #autoload. By default, instances of FilePath and
Package can be used."
<category: 'instance creation'>
| autoload |
autoload := Kernel.AutoloadClass class: nameSymbol in: aNamespace loader: anObject.
^aNamespace at: nameSymbol put: autoload
]
class [
"We need it to access the metaclass instance, because that's what
will load the file."
<category: 'accessing'>
<primitive: VMPrimitives.VMpr_Object_class>
]
doesNotUnderstand: aMessage [
"Load the class and resend the message to it"
<category: 'accessing'>
^aMessage reinvokeFor: self class loadedClass_
]
]
|