"

 Copyright (c) 2010-2011 Jan Vrany, Jan Kurs & Marcel Hlopko,

                         SWING Research Group, Czech Technical University 

                         in Prague

 Permission is hereby granted, free of charge, to any person

 obtaining a copy of this software and associated documentation

 files (the 'Software'), to deal in the Software without

 restriction, including without limitation the rights to use,

 copy, modify, merge, publish, distribute, sublicense, and/or sell

 copies of the Software, and to permit persons to whom the

 Software is furnished to do so, subject to the following

 conditions:

 The above copyright notice and this permission notice shall be

 included in all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,

 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES

 OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT

 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,

 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

 OTHER DEALINGS IN THE SOFTWARE.

"

"{ Package: 'stx:libjava' }"

Lookup subclass:#JavaLookup

	instanceVariableNames:'s2j j2s'

	classVariableNames:'Instance'

	poolDictionaries:''

	category:'Languages-Java-Interop'

!

Lookup subclass:#Java2Smalltalk

	instanceVariableNames:''

	classVariableNames:''

	poolDictionaries:''

	privateIn:JavaLookup

!

Lookup subclass:#Smalltalk2Java

	instanceVariableNames:''

	classVariableNames:''

	poolDictionaries:''

	privateIn:JavaLookup

!

!JavaLookup class methodsFor:'documentation'!

copyright

"

 Copyright (c) 2010-2011 Jan Vrany, Jan Kurs & Marcel Hlopko,

                         SWING Research Group, Czech Technical University 

                         in Prague

 Permission is hereby granted, free of charge, to any person

 obtaining a copy of this software and associated documentation

 files (the 'Software'), to deal in the Software without

 restriction, including without limitation the rights to use,

 copy, modify, merge, publish, distribute, sublicense, and/or sell

 copies of the Software, and to permit persons to whom the

 Software is furnished to do so, subject to the following

 conditions:

 The above copyright notice and this permission notice shall be

 included in all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,

 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES

 OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT

 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,

 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

 OTHER DEALINGS IN THE SOFTWARE.

"

! !

!JavaLookup class methodsFor:'instance creation'!

cleanup

    Instance := nil.

    "Modified: / 25-02-2011 / 14:45:03 / kursjan <kursjan@fit.cvut.cz>"

    "Created: / 19-09-2011 / 23:25:08 / Jan Kurs <kursjan@fit.cvut.cz>"

    "Modified: / 15-12-2011 / 23:05:37 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

instance

    Instance isNil ifTrue:[

        Instance := self basicNew initialize

    ].

    ^Instance

    "Modified: / 25-02-2011 / 14:45:03 / kursjan <kursjan@fit.cvut.cz>"

    "Created: / 19-09-2011 / 23:20:49 / Jan Kurs <kursjan@fit.cvut.cz>"

    "Modified: / 15-12-2011 / 23:05:29 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

new

    ^ self shouldNeverBeSent.

    "Created: / 25-02-2011 / 14:44:43 / kursjan <kursjan@fit.cvut.cz>"

    "Modified: / 29-08-2011 / 21:10:12 / Jan Kurs <kursjan@fit.cvut.cz>"

! !

!JavaLookup methodsFor:'initialization'!

initialize

    "Invoked when a new instance is created."

    s2j := Smalltalk2Java new.

    j2s := Java2Smalltalk new.

    "Modified: / 15-12-2011 / 23:06:57 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!JavaLookup methodsFor:'lookup'!

lookupMethodForSelector:selector directedTo:initialSearchClass for:aReceiver withArguments:argArrayOrNil from:sendingContext ilc: ilcCache

    "Invoked by the VM to ask me for a method to call.

     The arguments are: the selector, receiver and arguments,

     the class to start the search in (for here-, super and directed sends)

     the sending context and the inline/poly cache (instance of

     PolymorphicInlineCache). "

    | m |

    m := super lookupMethodForSelector:selector directedTo:initialSearchClass for:aReceiver withArguments:argArrayOrNil from:sendingContext ilc: ilcCache.

    m notNil ifTrue: [ ^ m ].

    sendingContext programmingLanguage isSmalltalk ifTrue:[

        aReceiver class theNonMetaclass programmingLanguage isJava ifTrue:[

            ^s2j lookupMethodForSelector:selector directedTo:initialSearchClass for:aReceiver withArguments:argArrayOrNil from:sendingContext ilc: ilcCache.

        ]

    ].

    sendingContext programmingLanguage isJava ifTrue:[

        aReceiver class programmingLanguage isSmalltalk ifTrue:[

            ^j2s lookupMethodForSelector:selector directedTo:initialSearchClass for:aReceiver withArguments:argArrayOrNil from:sendingContext ilc: ilcCache.

        ]

    ].

    ^nil

    "Created: / 01-10-2011 / 13:18:40 / Jan Kurs <kursjan@fit.cvut.cz>"

    "Created: / 15-12-2011 / 23:11:45 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!JavaLookup::Java2Smalltalk methodsFor:'lookup'!

lookupMethodForSelector:selector directedTo:initialSearchClass for:receiver withArguments:argArrayOrNil from:sendingContext ilc: ilc

    | d m |

    d := JavaDescriptor readFrom: (selector readStream skipThrough: $(; backStep; yourself).

    m := self lookupMethodForSelector: selector directedTo: initialSearchClass numArguments: d numArgs.

    m notNil ifTrue: [

        m := self compileProxyWithSelector: selector descriptor: d in: receiver class calling: m.

        ilc notNil ifTrue:[ilc bindTo: m forClass: receiver class].

        ^m.

    ] ifFalse:[

        ^ nil

    ]

    "Created: / 06-09-2011 / 22:04:04 / Jan Kurs <kursjan@fit.cvut.cz>"

    "Modified: / 09-10-2011 / 22:59:18 / kursjan <kursjan@fit.cvut.cz>"

    "Created: / 19-11-2011 / 12:37:26 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

lookupMethodForSelector:jselector directedTo:initialSearchClass numArguments: nArgs

    | name cls |

    name := jselector upTo: $(.

    "Pass 1: Search for explicitly annotated method"

    cls := initialSearchClass.

    [ cls notNil ] whileTrue:[

        cls methodDictionary keysAndValuesDo:[:sel :mthd|

            | jdescriptor |

            mthd numArgs == nArgs ifTrue:[

                (jdescriptor := mthd annotationAt: #javaselector:) notNil ifTrue:[

                    jdescriptor arguments first == jselector ifTrue: [

                        ^mthd    

                    ]

                ].

            ]

        ].

        cls := cls superclass.

    ].

    "Pass 2: Search for method with matching name"

    cls := initialSearchClass.

    [ cls notNil ] whileTrue:[

        cls methodDictionary keysAndValuesDo:[:sel :mthd|

            mthd numArgs == nArgs ifTrue:[

                (sel startsWith: name) ifTrue:[

                    ^mthd

                ]

            ]

        ].

        cls := cls superclass.

    ].

    ^nil

    "Created: / 16-12-2011 / 00:00:31 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!JavaLookup::Java2Smalltalk methodsFor:'utilities'!

addSelector:selector withMethod:proxy toClass:class 

    ProxyMethod installProxies ifTrue:[

        Class withoutUpdatingChangesDo:[

            class addSelector:selector withMethod:proxy.

        ]

    ]

    "Modified: / 23-12-2011 / 13:09:06 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

compileProxyWithSelector:selector descriptor:descriptor in:class calling:callee 

    |compiler proxy body|

    compiler := ProxyMethodCompiler new.

    body := compiler newJavaMethodInvocation:callee.

    body descriptor:descriptor.

    proxy := compiler 

                compile:body 

                arguments:callee numArgs 

                selector: selector.

"/    JK: do nod add here

"/    self 

"/        addSelector:selector

"/        withMethod:proxy

"/        toClass:class.

    ^ proxy

    "Created: / 14-12-2011 / 20:48:55 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Modified: / 01-01-2012 / 19:33:45 / kursjan <kursjan@fit.cvut.cz>"

! !

!JavaLookup::Smalltalk2Java methodsFor:'lookup'!

lookupMethodForSelector:selector directedTo:initialSearchClass for:receiver withArguments:argArrayOrNil from:sendingContext ilc: ilc

    "

    As a courtesy to a Smalltalker, try to map smalltalk selectors to a java ones.

    Returns JavaMethodDescriptor or nil.

    "

    | name nameSizePlusOne candidates finder static cls m |

    name := selector upTo: $:.

    nameSizePlusOne := name size + 1.

    static := receiver isBehavior.

    candidates := OrderedCollection new.

    finder := [:cls|

        cls methodDictionary keysAndValuesDo:[:sel :mthd|

            (mthd mclass ~~ ProxyMethod

                and:[((sel size >= nameSizePlusOne) and:[(sel at: nameSizePlusOne) == $( and:[(sel startsWith: name)]])

                    and:[mthd descriptor numArgs == argArrayOrNil size]]) ifTrue:[

                        candidates add: mthd

                    ]

        ]

    ].

    cls := initialSearchClass theNonMetaclass.

    static ifTrue:[

        finder value: cls

    ] ifFalse:[

        [ cls notNil and:[cls ~~ JavaObject] ] whileTrue:[

            finder value: cls.

            cls := cls superclass.

        ]     

    ].

    candidates notEmpty ifTrue:[

        m := self compileProxyWithSelector: selector in: receiver class calling: candidates.

        ilc notNil ifTrue:[ilc bindTo: m forClass: receiver class].

        "Install the proxy"

        self addSelector: selector withMethod: m toClass: receiver class.

        ^m.

    ].

    ^nil

    "Created: / 21-02-2011 / 13:38:55 / kursjan <kursjan@fit.cvut.cz>"

    "Modified: / 29-08-2011 / 20:38:21 / kursjan"

    "Modified: / 20-09-2011 / 00:03:48 / Jan Kurs <kursjan@fit.cvut.cz>"

    "Modified (format): / 25-09-2011 / 21:08:45 / Jan Kurs <kursjan@fit.cvut.cz>"

    "Created: / 19-11-2011 / 13:03:39 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Modified: / 01-01-2012 / 17:41:42 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Modified: / 01-01-2012 / 19:58:59 / kursjan <kursjan@fit.cvut.cz>"

    "Modified (comment): / 02-01-2012 / 10:35:25 / kursjan <kursjan@fit.cvut.cz>"

! !

!JavaLookup::Smalltalk2Java methodsFor:'lookup (old)'!

old_lookupMethodForSelector:selector directedTo:initialSearchClass for:receiver withArguments:argArrayOrNil from:sendingContext ilc: ilc

    "

    As a courtesy to a Smalltalker, try to map smalltalk selectors to a java ones.

    Returns JavaMethodDescriptor or nil.

    "

    |descriptor candidate static cls m |

    static := receiver isBehavior.

    descriptor := JavaMethodDescriptor 

            name: (selector upTo:$:) 

            parameters: (argArrayOrNil ? #() collect:[:a|

                (a class isString and: [JavaVM booted]) ifTrue:[

                    JavaFieldDescriptorWithUnionType new

                        addDescriptor: (JavaFieldDescriptor javaClass: a class);

                        addDescriptor: (JavaFieldDescriptor javaClass: (Java classForName: 'java.lang.String'));

                        yourself.

                ] ifFalse:[

                    JavaFieldDescriptor javaClass: a class

                ]

            ]).

    cls := initialSearchClass theNonMetaclass.

    [ cls notNil and:[cls ~~ JavaObject] ] whileTrue:[

        cls methodsDo:[:mthd|

            "/(mthd selector startsWith: 'foo') ifTrue:[self breakPoint: #jv]. 

            (mthd class ~~ ProxyMethod and:[mthd isStatic == static and:[descriptor match: mthd descriptor]]) ifTrue:[

                candidate isNil ifTrue:[

                    candidate := mthd

                ] ifFalse:[

                    candidate descriptorSymbol ~~ mthd descriptorSymbol ifTrue:[

                        "Hm, hm, two matching methods with different descriptors means

                         ambiguity...raise an error"

                        "Bit hacky - NamespaceAwareLookup already has method to generate

                         ambigouous send trampouline..."

                        ^NamespaceAwareLookup instance ambiguousMessageSend: selector withArgs: argArrayOrNil

                    ]

                ].

            ]                                                                 

        ].

        cls := cls superclass.                

    ].

    candidate notNil ifTrue:[

        m := self compileProxyWithSelector: selector descriptor: descriptor in: receiver class calling: candidate.

        ilc notNil ifTrue:[ilc bindTo: m forClass: receiver class].

        ^m.

    ].

    ^nil

    "Created: / 21-02-2011 / 13:38:55 / kursjan <kursjan@fit.cvut.cz>"

    "Modified: / 11-04-2011 / 20:19:50 / kursjan <kursjan@fit.cvut.cz>"

    "Modified: / 29-08-2011 / 20:38:21 / kursjan"

    "Modified: / 20-09-2011 / 00:03:48 / Jan Kurs <kursjan@fit.cvut.cz>"

    "Modified (format): / 25-09-2011 / 21:08:45 / Jan Kurs <kursjan@fit.cvut.cz>"

    "Created: / 16-12-2011 / 23:05:41 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!JavaLookup::Smalltalk2Java methodsFor:'matching'!

descriptorForJavaSelector:arg

    ^ MessageDescription new 

        parserClass: JavaSelectorParser;

        selector: arg;

        yourself.

    "Created: / 29-08-2011 / 20:41:48 / Jan Kurs <kursjan@fit.cvut.cz>"

!

descriptorForSmalltalkSelector:selector arguments: args

    ^ MessageDescription new 

        parserClass: SmalltalkSelectorParser;

        runtimeArguments: args;

        selector: selector;

        yourself.

    "Created: / 29-08-2011 / 21:44:06 / Jan Kurs <kursjan@fit.cvut.cz>"

!

findBestMatchOf: smalltalkMethod in: javaMethods

    | methods |

    javaMethods size = 1 ifTrue: [

        ^ javaMethods first.    

    ].

    javaMethods size = 0 ifTrue: [

        ^ nil

    ].

    methods := javaMethods select: [:m |

        m argSize = smalltalkMethod argSize.

    ].

    methods size = 1 ifTrue: [

        ^ methods first.    

    ].

    methods := methods select: [:m |

        self javaMatches: m argTypes to: smalltalkMethod args.

    ].

    methods size = 1 ifTrue: [

        ^ methods first.

    ].

    methods size = 0 ifTrue: [

        ^ nil.

    ].

    ^ Error raiseErrorString: 'Ambiguous selector: ', smalltalkMethod name.

    "Created: / 29-08-2011 / 20:50:14 / Jan Kurs <kursjan@fit.cvut.cz>"

!

javaMatches: jArgs to: sArgs

    1 to: jArgs size do: [ :i |

        ((JavaTypeBox typeBoxForJava: (jArgs at: i)) smalltalkType = ((sArgs at: i) className)) ifFalse: [ ^ false ].

    ].

    ^ true.

    "Created: / 29-08-2011 / 21:21:37 / Jan Kurs <kursjan@fit.cvut.cz>"

!

javaSelectorsFor:class

    | selectors cls static |

    cls := class.

    selectors := IdentitySet new.

    self breakPoint: #jk info: 'determine static based on class'.

    static := false.

    [cls = JavaObject] whileFalse: [

        cls methodDictionary keysAndValuesDo: [:k :v |

            (v isJavaMethod and: [v isStatic = static]) ifTrue: [

                selectors add: k.

            ].

        ].

        cls := cls superclass.

    ].

    ^ selectors.

    "Created: / 06-09-2011 / 22:20:34 / Jan Kurs <kursjan@fit.cvut.cz>"

! !

!JavaLookup::Smalltalk2Java methodsFor:'utilities'!

addSelector:selector withMethod:proxy toClass:class 

    ProxyMethod installProxies ifTrue:[

        Class withoutUpdatingChangesDo:[

            class addSelector:selector withMethod:proxy.

        ]

    ]

    "Modified: / 23-12-2011 / 13:09:14 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Created: / 01-01-2012 / 17:41:46 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

compileProxyWithSelector:selector in:class calling:methods 

    "For given set of methods, create a dispatching proxy with given selector.

     This method performs typechecks on arguments and dispatch to proper method"

    |compiler proxy body fallback|

    compiler := ProxyMethodCompiler new.

    fallback := self 

                calling:methods

                compiler:compiler.

     "Generate and install dispatching tree..."

    selector numArgs == 0 ifTrue:[

        "If method has no arguments, no dynamic method dispatch is

         required. Therefore, no fallback is needed. In theory, there is

         no need for proxy method at all..."

        self assert:methods size == 1.

        body := compiler newJavaMethodInvocation:methods anyOne.

    ] ifFalse:[

        "JV@2012-01-01: Based on discussion with JK, if there is no overloaded method

         DO NOT compile guard, call the method directly. We'll see..."

        methods size == 1 ifTrue:[

            body := (compiler newJavaMethodInvocation:methods anElement).

        ] ifFalse:[

            "For every method, create a guard and add it"

            body := fallback.

        ]

    ].

    "/Create and install proxy

    proxy := compiler 

                compile:body

                arguments:methods anyOne descriptor numPhysicalArgs

                selector:selector.

"/    self halt.

"/    JK: do NOT install here, just compile and return the proxy. Let someone else to install

"/    self 

"/        addSelector:selector

"/        withMethod:proxy

"/        toClasS:class.

    ^ proxy

    "Created: / 16-12-2011 / 23:21:55 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Modified: / 30-12-2011 / 14:44:11 / kursjan <kursjan@fit.cvut.cz>"

!

compileProxyWithSelector: selector in: class calling: methods receiver: receiver arguments: arguments

    "For given receiver and arguments, selects apropriate method from methods

     and compile guard"

    | compiler method proxy condition invocation fallback guard |

    compiler := ProxyMethodCompiler new.    

    proxy := class compiledMethodAt: selector.

    proxy notNil ifTrue:[

        fallback := proxy body    

    ] ifFalse:[

        fallback := self fallbackWithSelector: selector in: class calling: methods compiler: compiler.

    ].

    method := self selectMethodFrom: methods arguments: arguments.

    invocation := compiler newJavaMethodInvocation:method.