"

 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

    "This method performs standard Java lookup as required JVM spec. See 

        - JVM spec, 5.4.2.1 Method overriding

        - JVM spec, 6.4 invokevirtual

     This is hacky because of those stupid package-private methods. Sigh."

    | method superMethod |

    method := super lookupMethodForSelector: selector directedTo: initialSearchClass.

    method isNil ifTrue:[ ^ nil ].

    superMethod := super lookupMethodForSelector: selector directedTo: method mclass superclass.

    [ superMethod notNil ] whileTrue:[

        (method overrides: superMethod) ifFalse:[

            method := superMethod

        ].

        superMethod := super lookupMethodForSelector: selector directedTo: superMethod mclass superclass.

    ].

    ^method

    "Created: / 05-07-2012 / 11:06:07 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

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). "

     "JV@2012-08-21: Following C code speeds up Java<->Smalltalk interop by

      order of 2 magnitudes. However, it breaks Java reflection. 

      This is because it does not handle package private methods correctly.

      On the other hand, PP methods are not handled correctly when not using 

      reflection anyway, so lets keep the optimization here.

      Once we will have functinal JIT compiler, we can remove it and Java

      package-private method will be supported correctly in all cases.

     "

%{

    OBJ method;

    method = __lookup(initialSearchClass, selector);

    if ( method ) {

        if ( ilcCache ) {

            __ilcBind(ilcCache, initialSearchClass, method, selector);

        }

        RETURN (method);

    }

%}.

    sendingContext programmingLanguage isSmalltalk ifTrue:[

        aReceiver class theNonMetaclass programmingLanguage isJavaLike ifTrue:[

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

        ].

    ].

    sendingContext programmingLanguage isJavaLike ifTrue:[

        initialSearchClass programmingLanguage isSmalltalk ifTrue:[

            "Java to Smalltalk send"

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

        ].

        initialSearchClass programmingLanguage isJavaLike ifTrue:[

            "Java to Java send"

            | m |

            m := self lookupMethodForSelector: selector directedTo: initialSearchClass.

            m notNil ifTrue:[

                ilcCache notNil ifTrue:[ ilcCache bindTo: m forClass: aReceiver class ].

                ^m.

            ]

        ].

    ].

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

    "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

"/    JV: Why?

    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>"

    "Modified: / 24-02-2012 / 20:36:24 / Jan Vrany <jan.vrany@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 | 

                "candidates may contain a method with same selector ->

                 do not add super-class's method"

                (candidates contains: [:each | each selector == sel ]) ifFalse: [

                    (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 ]

                ]

            ]

    ].

     "Search class for method candidates"

    cls := initialSearchClass theNonMetaclass.

    static ifTrue: [ finder value: cls ] ifFalse: [

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

            finder value: cls.

            cls := cls superclass.

        ]

    ].

    candidates notEmpty ifTrue: [

        "because java compiler generates synthetic method, when overriden

         method has narrower return type than method from superclass/interface,

         we don't take these particular synthetic methods as candidates, they just

         delegate to overridden methods."

        ((candidates size > 1) and:[candidates anySatisfy:[:each|each isSynthetic]]) ifTrue:[

            | candidatesPerNameAndArg |

            candidatesPerNameAndArg := Dictionary new.

            candidates do:[:each|

                | nameAndArgs |

                nameAndArgs := each selector upTo:$).

                candidatesPerNameAndArg at: nameAndArgs ifAbsentPut:[each]. 

            ].

            candidates := candidatesPerNameAndArg values.

        ].        

        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.

    ].

     "Hmm, hmm, maybe a public field?"

    (argArrayOrNil size < 2) ifTrue: [

        | field |

        field := initialSearchClass theNonMetaclass 

                lookupFieldFor: name

                static: initialSearchClass isMetaclass

                onlyPublic: true.

        field notNil ifTrue: [

            m := self 

                    compileProxyWithSelector: selector

                    in: receiver class

                    accessing: field.

            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 / 19:58:59 / kursjan <kursjan@fit.cvut.cz>"

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

    "Modified: / 17-03-2012 / 17:22:33 / Jan Vrany <jan.vrany@fit.cvut.cz>"

    "Modified: / 18-11-2012 / 18:17:28 / Marcel Hlopko <hlopkmar@fel.cvut.cz>"

    "Modified: / 16-12-2012 / 13:59:55 / Marcel Hlopko <marcel.hlopko@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.

    ].