"
 COPYRIGHT (c) 1996-2011 by Claus Gittinger
 COPYRIGHT (c) 2010-2011 by Jan Vrany, Jan Kurs and Marcel Hlopko
                            SWING Research Group, Czech Technical University in Prague (*)

 This software is furnished under a license and may be used
 only in accordance with the terms of that license and with the
 inclusion of the above copyright notice.   This software may not
 be provided or otherwise made available to, or used by, any
 other person.  No title to or ownership of the software is
 hereby transferred.

 (*) extensions, changes and fixes for java1.1 compatibility.
     For a list of changes, see a list of diffs against the last stable version before 2011-08.
"
"{ Package: 'stx:libjava' }"

JavaMethodWithHandler variableSubclass:#JavaNativeMethod
	instanceVariableNames:'nativeImplementation'
	classVariableNames:'CacheNativeImplementation'
	poolDictionaries:''
	category:'Languages-Java-Classes'
!

!JavaNativeMethod class methodsFor:'documentation'!

copyright
"
 COPYRIGHT (c) 1996-2011 by Claus Gittinger
 COPYRIGHT (c) 2010-2011 by Jan Vrany, Jan Kurs and Marcel Hlopko
                            SWING Research Group, Czech Technical University in Prague (*)

 This software is furnished under a license and may be used
 only in accordance with the terms of that license and with the
 inclusion of the above copyright notice.   This software may not
 be provided or otherwise made available to, or used by, any
 other person.  No title to or ownership of the software is
 hereby transferred.

 (*) extensions, changes and fixes for java1.1 compatibility.
     For a list of changes, see a list of diffs against the last stable version before 2011-08.

"
! !

!JavaNativeMethod class methodsFor:'initialization'!

cacheNativeImplementation

    "For details, see #cacheNativeImplementation:"
    
    ^CacheNativeImplementation

    "Created: / 30-04-2011 / 23:38:21 / Jan Vrany <jan.vrany@fit.cvut.cz>"
!

cacheNativeImplementation: aBoolean

    "If set, native implementations are cached, resulting
     in better performance when calling native methods.
     Hower, no change in native method implemenetaion will
     not be visible then, unless #flushAllCachedNativeMethods
     is explictely called"

    CacheNativeImplementation := aBoolean

    "Created: / 30-04-2011 / 23:38:10 / Jan Vrany <jan.vrany@fit.cvut.cz>"
!

initialize
    self flags:(self flags bitOr:Behavior flagJavaMethod).

    "By default, do not cache native impls while developing"
    CacheNativeImplementation := Smalltalk isStandAloneApp.

    "Modified: / 30-04-2011 / 23:35:40 / Jan Vrany <jan.vrany@fit.cvut.cz>"
! !

!JavaNativeMethod class methodsFor:'cleanup'!

flushAllCachedNativeMethods
    self allInstancesDo:[:aNativeMethod |
        aNativeMethod nativeImplementation:nil
    ].

    "
     self flushAllCachedNativeMethods
    "

    "Created: / 24.12.1999 / 03:10:38 / cg"
    "Modified: / 24.12.1999 / 03:10:51 / cg"
! !

!JavaNativeMethod methodsFor:'accessing'!

nativeImplementation
    "return the value of the instance variable 'nativeImplementation' (automatically generated)"

    ^ nativeImplementation

    "Created: / 25.9.1999 / 23:08:00 / cg"
!

nativeImplementation:something
    "set the value of the instance variable 'nativeImplementation' (automatically generated)"

    nativeImplementation := something.

    "Created: / 25.9.1999 / 23:08:00 / cg"
!

sourceLineNumber
    ForceByteCodeDisplay == true ifTrue:[ ^ 1].
    lineNumberTable notNil ifTrue:[ ^ lineNumberTable at:2].
    ^1


    "
    ^ (JavaSourceCodeCache new) 
        findLineForMethod:(self selector)
        inClass:javaClass.
    "

    "Modified: / 13-12-2010 / 13:55:55 / Jan Kurs <kurs.jan@post.cz>"
    "Modified: / 13-12-2010 / 23:46:30 / Marcel Hlopko <hlopik@gmail.com>"
    "Created: / 17-12-2010 / 10:34:43 / Jan Vrany <jan.vrany@fit.cvut.cz>"
! !

!JavaNativeMethod methodsFor:'private'!

compileNativeImplementation: sel dispatchingTo: oldSel

    | src arg converted |
    src := (JavaVM class compiledMethodAt: oldSel) source.
    src := src asStringCollection.
    (src first includesString: 'aJavaContext') ifTrue:[
        arg := 'aJavaContext'
    ] ifFalse:[
        (src first includesString: 'nativeContext') ifTrue:[
            arg := 'nativeContext'
        ]
    ].
    arg ifNotNil:[
        src removeFirst asString.
        converted := true.
    ] ifNil:[
        arg := 'nativeContext'.
        src := '    self breakPoint: #jv info: ''Convert it to new-style natives''.

                ^ self ', oldSel, ' nativeContext'.
        converted := false.            
    ].

    (JavaVM class 
        compile:
            (self nativeMethodTemplate bindWith:sel with: arg with: src asString)
        classified:         
            'native - ', ((javaClass javaPackage upTo:$$) replaceAll:$/ with:$. ))
        package: JavaVM package.

    converted ifTrue:[
        (JavaVM class compiledMethodAt: oldSel) category: 'native - old-style (converted)'
    ] ifFalse:[
       (JavaVM class compiledMethodAt: oldSel) category:  'native - old-style (FAILED to convert)'
    ]

    "Created: / 01-05-2011 / 00:08:59 / Jan Vrany <jan.vrany@fit.cvut.cz>"
    "Modified: / 01-05-2011 / 13:15:13 / Jan Vrany <jan.vrany@fit.cvut.cz>"
!

compileNativeImplementationStub: sel

    (JavaVM class 
        compile:
            (self nativeMethodTemplate bindWith:sel with: 'nativeContext' with:('^ UnimplementedNativeMethodSignal raise'))
        classified:         
            'native - ', ((javaClass javaPackage upTo:$$) replaceAll:$/ with:$.))
        package: JavaVM package

    "Created: / 01-05-2011 / 00:08:59 / Jan Vrany <jan.vrany@fit.cvut.cz>"
!

nativeMethodTemplate

    ^'%1 %2

    <javanative: ''', javaClass name , ''' name: ''', (selector copyWithoutLast:signature size), '''>

    %3'

    "Created: / 01-05-2011 / 00:12:42 / Jan Vrany <jan.vrany@fit.cvut.cz>"
!

searchNativeImplementation

    "Returns a SELECTOR of native method implementation.
    For now, two naming schemes are used. The onld one uses
    just a class name and selector as a name for native method impl.
    The new one uses fully qualified class name.
    "

    | nm newStyleSel oldStyleSel |
    nm := selector upTo: $(.
    newStyleSel := ('_' , ((javaClass name copyReplaceAll:$/ with:$_) replaceAll:$$ with:$_), '_' , nm , ':') asSymbol.    
    (JavaVM class canUnderstand: newStyleSel) ifTrue:
        ["Good, a JavaVM understands new style native selectors"
        ^newStyleSel].

    oldStyleSel := ('_' , (javaClass lastName copyReplaceAll:$$ with:$_) , '_' , nm , ':') asSymbol.
    (JavaVM class canUnderstand: oldStyleSel) ifTrue:
        [
        "Convert method on the fly only if Im Jan Vrany
         (to avoid confusion of other developers :-)"
        OperatingSystem getLoginName = 'jv' ifTrue:[
            "OK, old style method has not yet been converted to a newstyle one.
            Converts old-style method to a new-style one"
            self compileNativeImplementation: newStyleSel dispatchingTo: oldStyleSel.
            ^newStyleSel
        ] ifFalse:[
            ^oldStyleSel
        ]].
    self compileNativeImplementationStub: newStyleSel.
    ^newStyleSel

    "Created: / 30-04-2011 / 23:50:29 / Jan Vrany <jan.vrany@fit.cvut.cz>"
    "Modified: / 13-08-2011 / 01:08:04 / Jan Vrany <jan.vrany@fit.cvut.cz>"
! !

!JavaNativeMethod methodsFor:'vm support'!

nativeMethodInvokation

    "Called by the VM when a native method is
     to be executed"

    | sel mthd sender|

    (mthd := nativeImplementation) isNil ifTrue:[
        sel := self searchNativeImplementation.

        mthd := (JavaVM class compiledMethodAt:sel).
        (mthd isNil or:[mthd isLazyMethod]) ifTrue:[
            sender := thisContext sender.
            sender sender selector == #noByteCode ifTrue:[
                sender := sender sender.
                sender := sender sender.
                sender := sender sender.
            ].
            ^ JavaVM 
                perform:sel
                with:sender.
        ].
        CacheNativeImplementation ifTrue:[
            nativeImplementation := mthd.
        ]
    ].

    ^ mthd
        valueWithReceiver:JavaVM
        arguments:(Array with:thisContext sender)
        selector:selector
        search:JavaVM class
        sender:nil

"
JavaNativeMethod flushAllCachedNativeMethods
"

    "Modified: / 27-01-2000 / 13:34:53 / cg"
    "Modified: / 30-04-2011 / 23:52:32 / Jan Vrany <jan.vrany@fit.cvut.cz>"
! !

!JavaNativeMethod class methodsFor:'documentation'!

version
    ^ '$Header: /cvs/stx/stx/libjava/JavaNativeMethod.st,v 1.10 2011-11-24 11:13:16 cg Exp $'
!

version_CVS
    ^ '$Header: /cvs/stx/stx/libjava/JavaNativeMethod.st,v 1.10 2011-11-24 11:13:16 cg Exp $'
!

version_SVN
    ^ '§Id: JavaNativeMethod.st,v 1.9 2011/08/18 18:42:48 vrany Exp §'
! !

JavaNativeMethod initialize!