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COPYRIGHT (c) 1996-2011 by Claus Gittinger
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COPYRIGHT (c) 2010-2011 by Jan Vrany, Jan Kurs and Marcel Hlopko
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SWING Research Group, Czech Technical University in Prague
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Parts of the code written by Claus Gittinger are under following
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license:
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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Parts of the code written at SWING Reasearch Group [1] are MIT licensed:
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation
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files (the 'Software'), to deal in the Software without
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restriction, including without limitation the rights to use,
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copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following
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conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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[1] Code written at SWING Research Group contain a signature
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of one of the above copright owners.
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"
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"{ Package: 'stx:libjava' }"
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Object subclass:#JavaNativeMemory
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instanceVariableNames:'addresses chunks'
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classVariableNames:''
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poolDictionaries:''
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category:'Languages-Java-Support'
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!
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!JavaNativeMemory class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1996-2011 by Claus Gittinger
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COPYRIGHT (c) 2010-2011 by Jan Vrany, Jan Kurs and Marcel Hlopko
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SWING Research Group, Czech Technical University in Prague
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Parts of the code written by Claus Gittinger are under following
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license:
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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Parts of the code written at SWING Reasearch Group [1] are MIT licensed:
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation
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files (the 'Software'), to deal in the Software without
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restriction, including without limitation the rights to use,
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copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following
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conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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[1] Code written at SWING Research Group contain a signature
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of one of the above copright owners.
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"
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! !
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!JavaNativeMemory class methodsFor:'instance creation'!
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new
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"return an initialized instance"
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^ self basicNew initialize.
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! !
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!JavaNativeMemory methodsFor:'accessing'!
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byteAt:address
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|i chunk offset|
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addresses size == 0 ifTrue:[
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self errorAccessingUnallocatedMemory:address
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].
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i := 1.
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[
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i <= (addresses size - 1) and:[ (addresses at:i + 1) <= address ]
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] whileTrue:[ i := i + 1 ].
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offset := address - (addresses at:i).
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chunk := chunks at:i.
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(offset > chunk size) ifTrue:[
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self errorAccessingUnallocatedMemory:address
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].
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^chunk at: offset + 1
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"Created: / 09-12-2010 / 17:32:45 / Jan Vrany <jan.vrany@fit.cvut.cz>"
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!
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longAt:address put:value
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|i chunk offset|
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addresses size == 0 ifTrue:[
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self errorAccessingUnallocatedMemory:address
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].
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i := 1.
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[
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i <= (addresses size - 1) and:[ (addresses at:i + 1) <= address ]
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] whileTrue:[ i := i + 1 ].
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offset := address - (addresses at:i).
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chunk := chunks at:i.
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(offset > chunk size) ifTrue:[
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self errorAccessingUnallocatedMemory:address
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].
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chunk longLongAt: offset + 1 put: value
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"Created: / 09-12-2010 / 17:32:02 / Jan Vrany <jan.vrany@fit.cvut.cz>"
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! !
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!JavaNativeMemory methodsFor:'allocation/deallocation'!
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free: address
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"Frees the memory"
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| index |
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address = 0 ifTrue:[^self].
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index := addresses
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indexOf: address
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ifAbsent:[self error:'Never allocated'].
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(chunks at: index)
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ifNil:[self error: 'Freed twice'].
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chunks at: index put: nil.
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"Created: / 07-12-2010 / 23:33:22 / Jan Vrany <jan.vrany@fit.cvut.cz>"
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!
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malloc: size
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"Allocate new chunk of memory, size bytes long"
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| address |
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self assert: addresses size == chunks size.
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addresses size > 0
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ifTrue: [address := addresses last + chunks last size ]
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ifFalse:[address := 0].
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address := address + (Random nextIntegerBetween: 128 and: 256).
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addresses add: address.
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chunks add: (ByteArray new: size).
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^address
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"Created: / 07-12-2010 / 23:25:09 / Jan Vrany <jan.vrany@fit.cvut.cz>"
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! !
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!JavaNativeMemory methodsFor:'error reporting'!
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errorAccessingUnallocatedMemory:arg
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self shouldImplement
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"Created: / 07-12-2010 / 23:40:01 / Jan Vrany <jan.vrany@fit.cvut.cz>"
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! !
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!JavaNativeMemory methodsFor:'initialization'!
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initialize
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"Invoked when a new instance is created."
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addresses := OrderedCollection new.
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chunks := OrderedCollection new.
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"/ super initialize. -- commented since inherited method does nothing
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"Modified: / 07-12-2010 / 23:09:04 / Jan Vrany <jan.vrany@fit.cvut.cz>"
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! !
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!JavaNativeMemory class methodsFor:'documentation'!
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version_SVN
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^ '$Id: JavaNativeMemory.st,v 1.1 2011-08-18 19:06:53 vrany Exp $'
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! !
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