"{ Package: 'jv:smallsense' }"

Object subclass:#SmallSenseInferencer

	instanceVariableNames:'class classInfo source parser parserClass tree'

	classVariableNames:''

	poolDictionaries:''

	category:'SmallSense-Inference'

!

SmallSenseParseNodeVisitor subclass:#Phase1

	instanceVariableNames:'classInfo sends types'

	classVariableNames:''

	poolDictionaries:''

	privateIn:SmallSenseInferencer

!

SmallSenseParseNodeVisitor subclass:#Phase2

	instanceVariableNames:'classInfo'

	classVariableNames:''

	poolDictionaries:''

	privateIn:SmallSenseInferencer

!

!SmallSenseInferencer class methodsFor:'documentation'!

documentation

"

    A heart of SmallSense - a type inferencer. For given class

    and method source, instance of inferences walks the parse tree

    and annotate each node with inferred type.

    [author:]

        Jan Vrany <jan.vrany@fit.cvut.cz>

    [instance variables:]

    [class variables:]

    [see also:]

"

! !

!SmallSenseInferencer class methodsFor:'instance creation'!

forClass: class methodSource: source

    ^self new class: class source: source

    "Created: / 26-11-2011 / 12:45:49 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

forClass: class selector: selector

    ^self new class: class selector: selector.

    "Created: / 26-11-2011 / 12:44:48 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

forMethod: method

    ^self new method: method.

    "Created: / 26-11-2011 / 12:45:16 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!SmallSenseInferencer methodsFor:'accessing'!

klass

    ^ class

    "Created: / 26-11-2011 / 17:30:35 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

manager

    ^SmallSenseManager instance

    "Created: / 27-11-2011 / 16:16:41 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

parser

    ^ parser

!

parserClass

    ^ parserClass

!

parserClass:aClass

    parserClass := aClass.

!

source

    ^ source

!

tree

    ^ tree

! !

!SmallSenseInferencer methodsFor:'initialization'!

class: cls selector: sel

    | m |

    m := cls >> sel.

    m isNil ifTrue:[

        self error: 'No method found'.

    ].

    self method: m.

    "Created: / 26-11-2011 / 12:47:39 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

class: cls source: src

    class := cls.

    classInfo := self manager infoForClass: class.

    source := src.

    "Created: / 26-11-2011 / 14:46:55 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

method: method

    self class: method mclass source: method source.

    "Created: / 26-11-2011 / 12:48:40 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!SmallSenseInferencer methodsFor:'private'!

infer

    Phase1 process: tree in: class.

    "

    (SmallSenseParseNodeInspector new node: tree source: source) open

    "

    "Created: / 26-11-2011 / 12:51:32 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

parse

    parserClass isNil ifTrue:[

        parserClass := class parserClass.

    ].

    parser := parserClass 

                parseMethod: source in: class

                ignoreErrors:true 

                ignoreWarnings:true.

    tree := parser tree.

    "Created: / 26-11-2011 / 12:51:31 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!SmallSenseInferencer methodsFor:'processing'!

process

    "Actually infer types. Returns an annotated method tree.

     The tree is also stored in an instance variable, so it

     may be obtained form receiver any time by asking for #tree."

    self parse. 

    tree notNil ifTrue:[

        self infer.

    ].

    ^tree

    "Created: / 26-11-2011 / 12:50:54 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!SmallSenseInferencer::Phase1 methodsFor:'initialization'!

initialize

    "Invoked when a new instance is created."

    "/ please change as required (and remove this comment)

    sends := Dictionary new.

    types := Dictionary new.

    "/ super initialize.   -- commented since inherited method does nothing

    "Modified: / 26-11-2011 / 19:31:40 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!SmallSenseInferencer::Phase1 methodsFor:'private'!

rootsUnderstanding: selectors

    "When the set of selectors is not empty, answer a set of the highest possible classes in the system that implement all the selectors.

      When the set of selectors is empty, return the empty set."

    | initialClasses nextClasses traverseStack next |

    selectors isEmpty ifTrue: [^OrderedCollection new].

    nextClasses := OrderedCollection with: Object.

    traverseStack := OrderedCollection new: 1000.

    selectors

        do:

            [:selector | 

            initialClasses := nextClasses.

            nextClasses := OrderedCollection new.

            initialClasses

                do:

                    [:initialClass | 

                    "inline canUnderstand: for performance"

                    |cl|

                    cl := initialClass.

                    [(cl == nil) or: [(cl methodDictionary includesKey: selector)]] whileFalse: [cl := cl superclass].

                    (cl == nil)

                        ifFalse: [nextClasses addLast: initialClass]

                        ifTrue:

                            [|size|

                            traverseStack reset.

                            traverseStack addLast: initialClass.

                            size := 1.

                            "(traverseStack isEmpty) removed for performance"

                            [size = 0]

                                whileFalse:

                                    [

                                    "(traverseStack removeFirst) removed for performance"

                                    next := traverseStack removeFirst.

                                    size := size -1.

                                    next

                                        subclassesDo:

                                            [:subcl |

                                            "(subcl includesSelector: selector) removed for performance"

                                            (subcl methodDictionary includesKey: selector)

                                                ifTrue: [nextClasses addLast: subcl]

                                                ifFalse: [traverseStack addLast: subcl. size := size + 1]]]]]].

    ^nextClasses

    "Modified: / 24-11-2010 / 14:39:35 / Jakub <zelenja7@fel.cvut.cz>"

    "Modified: / 26-11-2011 / 14:01:32 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!SmallSenseInferencer::Phase1 methodsFor:'processing'!

process: tree in: cls

    self process: tree in: cls info: (SmallSenseManager instance infoForClass: cls)

    "Created: / 26-11-2011 / 13:48:46 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

process: tree in: cls info: clsInfo

     | i c |

    class := cls.

    classInfo := clsInfo.

    "Fill types with cached data..."

    c := class.

    i := classInfo.

    [ c notNil and:[i notNil] ] whileTrue:[

        c instVarNames do:[:nm|

            types at: nm put: (i infoForInstvar: nm)

        ].

        c := c superclass.

        i := i superclassInfo.

    ].

    self visit: tree.

    "Now, infer variable types based on collected sends"

    sends keysAndValuesDo:[:varName :sentSelectors|

        | classes |

        classes := self rootsUnderstanding: sentSelectors.

        (types at: varName) addClasses: classes.

    ].

    "Created: / 27-11-2011 / 16:22:24 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!SmallSenseInferencer::Phase1 methodsFor:'visiting'!

visitAssignmentNode:anObject

    self visit: anObject variable.

    self visit: anObject expression.

    "Created: / 26-11-2011 / 13:53:12 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

visitBlockNode:anObject

    | type |

    super visitBlockNode:anObject.

    type := (SmallSenseType withClass: BlockClosure).

    type trustfullness: 100.

    anObject inferedType: type.

    "Created: / 26-11-2011 / 14:46:02 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

visitConstantNode:anObject

    "Type of a constant is trivially its value class"

    | type |

    super visitConstantNode: anObject.

    type := (SmallSenseType withClass: anObject value class).

    type trustfullness: 100.

    anObject inferedType: type.

    "Created: / 26-11-2011 / 13:55:34 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

visitMessageNode:anObject 

    | rec |

    super visitMessageNode: anObject.

    (rec := anObject receiver) isVariableNode ifTrue:[

        "We don't have to infer types for global/class variables"

        (rec isGlobalVariable or:[rec isClassVariable]) ifFalse:[

            (sends at: rec name ifAbsentPut:[Set new]) add: anObject selector.

        ].

    ].

    "Created: / 26-11-2011 / 13:02:28 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

visitSelfNode:anObject

    super visitSelfNode:anObject.

    anObject inferedType:(SmallSenseType withClass: class)

    "Created: / 26-11-2011 / 14:43:47 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

visitSuperNode:anObject

    super visitSuperNode:anObject.

    anObject inferedType:(SmallSenseType withClass: class superclass)

    "Created: / 26-11-2011 / 14:44:23 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

visitUnaryNode:anObject 

    | type sel rec |

    super visitUnaryNode:anObject.

    sel := anObject selector.

    sel == #class ifTrue:[

        type := anObject receiver inferedType classSide.

        anObject inferedType: type.

        ^self.

    ].

    (sel == #new or:[sel == #basicNew]) ifTrue:[

        rec := anObject receiver.                        

        (rec isSelf and:[class isMetaclass]) ifTrue:[

            type := SmallSenseType withClass: class theNonMetaclass.

            type trustfullnessAdd: 50.

            anObject inferedType: type.

            ^self.

        ].

        type := anObject receiver inferedType instanceSide.

        anObject inferedType: type.

        ^self.

    ].

    "Created: / 27-11-2011 / 15:49:39 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

visitVariableNode:anObject

    | t |

    "Following code ensures, that all variable nodes refering same

     variable shares the inferred type"

    t := types at: anObject name ifAbsentPut:[SmallSenseType unknown].

    anObject inferedType: t.

    anObject isGlobalVariable ifTrue:[

        t addClass: (Smalltalk at: anObject name) class.

        t trustfullness: 100.

        ^self.

    ].

    anObject isClassVariable ifTrue:[

        t addClass: (class theNonMetaclass classVarAt: anObject name asSymbol) class.

        t trustfullness: 100.

        ^self.

    ].

    "Created: / 26-11-2011 / 13:31:19 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!SmallSenseInferencer::Phase2 methodsFor:'processing'!

process: tree in: cls

    self process: tree in: cls info: (SmallSenseManager instance infoForClass: cls)

    "Created: / 26-11-2011 / 13:48:46 / Jan Vrany <jan.vrany@fit.cvut.cz>"

!

process: tree in: cls info: clsInfo

    class := cls.

    classInfo := clsInfo.

    self visit: tree.

    "Created: / 27-11-2011 / 16:22:24 / Jan Vrany <jan.vrany@fit.cvut.cz>"

! !

!SmallSenseInferencer class methodsFor:'documentation'!

version_HG

    ^ '$Changeset: <not expanded> $'

!

version_SVN

    ^ '$Id: SmallSenseInferencer.st 8000 2012-05-17 23:16:11Z vranyj1 $'

! !