Class JSAstTranslator

java.lang.Object

com.ibm.wala.cast.tree.visit.CAstVisitor<AstTranslator.WalkContext>

com.ibm.wala.cast.ir.translator.AstTranslator

com.ibm.wala.cast.js.translator.JSAstTranslator

All Implemented Interfaces:

ArrayOpHandler, TranslatorToIR

public class JSAstTranslator
extends AstTranslator

Specialization of AstTranslator for JavaScript.

Nested Class Summary

Nested classes/interfaces inherited from class com.ibm.wala.cast.ir.translator.AstTranslator

AstTranslator.AbstractScope, AstTranslator.AbstractSymbol, AstTranslator.AstCFG, AstTranslator.AstLexicalInformation, AstTranslator.CodeEntityContext, AstTranslator.FinalCAstSymbol, AstTranslator.IncipientCFG, AstTranslator.InternalCAstSymbol, AstTranslator.PreBasicBlock, AstTranslator.RootContext, AstTranslator.Scope, AstTranslator.ScopeType, AstTranslator.Symbol, AstTranslator.TypeContext, AstTranslator.UnwindState, AstTranslator.WalkContext

Nested classes/interfaces inherited from class com.ibm.wala.cast.tree.visit.CAstVisitor

CAstVisitor.Context

Field Summary

Fields

Modifier and Type	Field	Description
static final CAstType	Any

Fields inherited from class com.ibm.wala.cast.ir.translator.AstTranslator

DEBUG_ALL, DEBUG_CFG, DEBUG_LEXICAL, DEBUG_NAMES, DEBUG_TOP, entity2ExposedNames, entity2WrittenNames, insts, loader, namedEntityResolver

Fields inherited from class com.ibm.wala.cast.tree.visit.CAstVisitor

currentPosition

Constructor Summary

Constructors

Constructor	Description
JSAstTranslator(JavaScriptLoader loader)

Method Summary

Modifier and Type	Method	Description
protected String	composeEntityName(AstTranslator.WalkContext parent, CAstEntity f)	create the language-appropriate name for f
protected void	declareFunction(CAstEntity N, AstTranslator.WalkContext context)	declare a new function, represented by N
protected TypeReference	defaultCatchType()	for a block that catches all exceptions, what is the root exception type that it can catch? E.g., for Java, java.lang.Throwable
protected void	defineField(CAstEntity topEntity, AstTranslator.WalkContext wc, CAstEntity n)	define a new field fieldEntity within topEntity
protected void	defineFunction(CAstEntity N, AstTranslator.WalkContext definingContext, AbstractCFG<SSAInstruction,? extends IBasicBlock<SSAInstruction>> cfg, SymbolTable symtab, boolean hasCatchBlock, Map<IBasicBlock<SSAInstruction>,TypeReference[]> caughtTypes, boolean hasMonitorOp, AstTranslator.AstLexicalInformation LI, AstMethod.DebuggingInformation debugInfo)	fully define a function.
protected boolean	defineType(CAstEntity type, AstTranslator.WalkContext wc)	define a new (presumably nested) type.
void	doArrayRead(AstTranslator.WalkContext context, int result, int arrayValue, CAstNode arrayRef, int[] dimValues)	generate IR for a CAst array read, updating context.cfg()
void	doArrayWrite(AstTranslator.WalkContext context, int arrayValue, CAstNode arrayRef, int[] dimValues, int rval)	generate IR for a CAst array write, updating context.cfg()
protected void	doCall(AstTranslator.WalkContext context, CAstNode call, int result, int exception, CAstNode name, int receiver, int[] arguments)	generate IR for a CAst method call expression, updating context.cfg()
protected void	doFieldRead(AstTranslator.WalkContext context, int result, int receiver, CAstNode elt, CAstNode readNode)	generate IR for a CAst field read, updating context.cfg()
protected void	doFieldWrite(AstTranslator.WalkContext context, int receiver, CAstNode elt, CAstNode parent, int rval)	generate IR for a CAst field write, updating context.cfg()
protected int	doGlobalRead(CAstNode n, AstTranslator.WalkContext context, String name, TypeReference type)	generate instructions for a read of a global
protected int	doLexicallyScopedRead(CAstNode n, AstTranslator.WalkContext context, String name, TypeReference type)	Note that the caller is responsible for ensuring that name is defined in a lexical scope.
protected void	doMaterializeFunction(CAstNode n, AstTranslator.WalkContext context, int result, int exception, CAstEntity fn)	generate IR for a CAst function expression, updating context.cfg()
protected void	doNewObject(AstTranslator.WalkContext context, CAstNode newNode, int result, Object type, int[] arguments)	generate IR for a CAst new expression, updating context.cfg()
protected void	doPrimitive(int resultVal, AstTranslator.WalkContext context, CAstNode primitiveCall)	generate IR for call modeling creation of primitive value, updating context.cfg()
protected void	doPrologue(AstTranslator.WalkContext context)	generate prologue code for each function body
protected void	doThrow(AstTranslator.WalkContext context, int exception)	generate IR for a CAst throw expression, updating context.cfg()
protected boolean	doVisit(CAstNode n, AstTranslator.WalkContext context, CAstVisitor<AstTranslator.WalkContext> visitor)	Node processing hook; sub-classes are expected to override if they introduce new node types.
protected CAstType	exceptionType()	the most-general exception type for the language being translated
protected CAstSourcePositionMap.Position[]	getParameterPositions(CAstEntity e)
protected boolean	hasImplicitGlobals()	If this returns true, new global declarations get created for any attempt to access a non-existent variable (believe it or not, JavaScript actually does this!)
protected boolean	ignoreName(String name)
protected void	leaveInstanceOf(CAstNode n, AstTranslator.WalkContext c, CAstVisitor<AstTranslator.WalkContext> visitor)	Leave an InstanceOf node.
protected String[]	makeNameMap(CAstEntity n, Set<AstTranslator.Scope> scopes, SSAInstruction[] insts)
protected TypeReference	makeType(CAstType type)
protected CAstType	topType()	the most-general type for the language being translated
protected boolean	treatGlobalsAsLexicallyScoped()	can lexical reads / writes access globals?
protected boolean	useDefaultInitValues()	does the language care about using type-appropriate default values? For Java, the answer is yes (ints should get a default value of 0, null for pointers, etc.).
protected boolean	visitInstanceOf(CAstNode n, AstTranslator.WalkContext c, CAstVisitor<AstTranslator.WalkContext> visitor)	Visit an InstanceOf node.

Methods inherited from class com.ibm.wala.cast.ir.translator.AstTranslator

assignValue, closeFunctionEntity, doGlobalWrite, doIsFieldDefined, doLexicallyScopedWrite, doLocalRead, doLocalWrite, enterEntity, getArgumentCount, getArgumentNames, getCodeContext, getIncludedEntity, getTypeForNode, handleUnspecifiedLiteralKey, hasSpecialUndeclaredVariables, initFunctionEntity, isExceptionLabel, leaveArrayLength, leaveArrayLiteral, leaveArrayLiteralInitElement, leaveArrayLiteralObject, leaveArrayRef, leaveArrayRefAssign, leaveArrayRefAssignOp, leaveAssert, leaveAssign, leaveBinaryExpr, leaveBlockExpr, leaveBlockExprAssign, leaveBlockExprAssignOp, leaveBlockStmt, leaveCall, leaveCatch, leaveConstant, leaveDeclStmt, leaveEachElementGet, leaveEachElementHasNext, leaveEcho, leaveEmpty, leaveFieldEntity, leaveFileEntity, leaveFunctionEntity, leaveFunctionExpr, leaveFunctionStmt, leaveGetCaughtException, leaveGlobalEntity, leaveGoto, leaveIfExpr, leaveIfExprCondition, leaveIfExprTrueClause, leaveIfgoto, leaveIfStmt, leaveIfStmtCondition, leaveIfStmtTrueClause, leaveInclude, leaveIsDefinedExpr, leaveLabelStmt, leaveLocalScope, leaveLoop, leaveLoopHeader, leaveNew, leaveObjectLiteral, leaveObjectLiteralFieldInit, leaveObjectRef, leaveObjectRefAssign, leaveObjectRefAssignOp, leavePrimitive, leaveReturn, leaveScriptEntity, leaveSpecialParentScope, leaveSuper, leaveSwitch, leaveSwitchValue, leaveThis, leaveThrow, leaveTry, leaveTryBlock, leaveTypeEntity, leaveTypeLiteralExpr, leaveUnaryExpr, leaveUnwind, leaveVar, leaveVarAssign, leaveVarAssignOp, leaveVoid, leaveYield, liftDeclarationsForLexicalScoping, makeCodeContext, makeFileContext, makeGlobalRef, makeLocalContext, makeScriptScope, makeSpecialParentContext, makeTypeContext, makeTypeScope, makeUnwindContext, processAssignOp, processFunctionExpr, processIf, setDefaultValue, topLevelFunctionsInGlobalScope, translate, translate, translateBinaryOpcode, translateConditionOpcode, translateUnaryOpcode, visitArrayLength, visitArrayLiteral, visitArrayRef, visitArrayRefAssign, visitArrayRefAssignOp, visitAssert, visitAssign, visitBinaryExpr, visitBlockExpr, visitBlockExprAssign, visitBlockExprAssignOp, visitBlockStmt, visitCall, visitCatch, visitConstant, visitDeclStmt, visitEachElementGet, visitEachElementHasNext, visitEcho, visitEmpty, visitFieldEntity, visitFileEntity, visitFunctionEntity, visitFunctionExpr, visitFunctionStmt, visitGetCaughtException, visitGlobalEntity, visitGoto, visitIfExpr, visitIfgoto, visitIfStmt, visitIsDefinedExpr, visitLabelStmt, visitLocalScope, visitLoop, visitMacroEntity, visitNew, visitObjectLiteral, visitObjectRef, visitObjectRefAssign, visitObjectRefAssignOp, visitPrimitive, visitReturn, visitScriptEntity, visitSpecialParentScope, visitSuper, visitSwitch, visitThis, visitThrow, visitTry, visitTypeEntity, visitTypeLiteralExpr, visitUnaryExpr, visitUnwind, visitVar, visitVarAssign, visitVarAssignOp, visitVoid, visitYield, walkEntities

Methods inherited from class com.ibm.wala.cast.tree.visit.CAstVisitor

doVisitArrayRefNode, doVisitAssignNodes, doVisitEntity, enterNode, getCurrentPosition, getParent, leaveArrayLiteralAssign, leaveCast, leaveClassStmt, leaveEntity, leaveForIn, leaveMacroEntity, leaveMacroVar, leaveNode, leaveObjectLiteralAssign, postProcessEntity, postProcessNode, setParent, visit, visitAllChildren, visitArrayLiteralAssign, visitAssignNodes, visitCast, visitChildren, visitClassStmt, visitEntities, visitEntity, visitForIn, visitInclude, visitMacroVar, visitNode, visitObjectLiteralAssign, visitScopedEntities, visitScopedEntities

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

Any

public static final CAstType Any

Constructor Details

JSAstTranslator

public JSAstTranslator(JavaScriptLoader loader)

Method Details

useDefaultInitValues

protected boolean useDefaultInitValues()

Description copied from class: AstTranslator

does the language care about using type-appropriate default values? For Java, the answer is yes (ints should get a default value of 0, null for pointers, etc.). For JavaScript, the answer is no, as any variable can hold the value 'undefined'.

Specified by:

useDefaultInitValues in class AstTranslator

hasImplicitGlobals

protected boolean hasImplicitGlobals()

Description copied from class: AstTranslator

If this returns true, new global declarations get created for any attempt to access a non-existent variable (believe it or not, JavaScript actually does this!)

Overrides:

hasImplicitGlobals in class AstTranslator

treatGlobalsAsLexicallyScoped

protected boolean treatGlobalsAsLexicallyScoped()

Description copied from class: AstTranslator

can lexical reads / writes access globals?

Specified by:

treatGlobalsAsLexicallyScoped in class AstTranslator

defaultCatchType

protected TypeReference defaultCatchType()

Description copied from class: AstTranslator

for a block that catches all exceptions, what is the root exception type that it can catch? E.g., for Java, java.lang.Throwable

Specified by:

defaultCatchType in class AstTranslator

makeType

protected TypeReference makeType(CAstType type)

Specified by:

makeType in class AstTranslator

ignoreName

protected boolean ignoreName(String name)

Overrides:

ignoreName in class AstTranslator

Parameters:

name - A variable name

Returns:

is this name safe to overwrite, i.e. it's synthetic from the translator?

makeNameMap

protected String[] makeNameMap(CAstEntity n,
 Set<AstTranslator.Scope> scopes,
 SSAInstruction[] insts)

Overrides:

makeNameMap in class AstTranslator

doLexicallyScopedRead

protected int doLexicallyScopedRead(CAstNode n,
 AstTranslator.WalkContext context,
 String name,
 TypeReference type)

Description copied from class: AstTranslator

Note that the caller is responsible for ensuring that name is defined in a lexical scope.

Overrides:

doLexicallyScopedRead in class AstTranslator

Parameters:

n - the AST node representing the read

doGlobalRead

protected int doGlobalRead(CAstNode n,
 AstTranslator.WalkContext context,
 String name,
 TypeReference type)

Description copied from class: AstTranslator

generate instructions for a read of a global

Overrides:

doGlobalRead in class AstTranslator

defineType

protected boolean defineType(CAstEntity type,
 AstTranslator.WalkContext wc)

Description copied from class: AstTranslator

define a new (presumably nested) type. return true if type was successfully defined, false otherwise

Specified by:

defineType in class AstTranslator

defineField

protected void defineField(CAstEntity topEntity,
 AstTranslator.WalkContext wc,
 CAstEntity n)

Description copied from class: AstTranslator

define a new field fieldEntity within topEntity

Specified by:

defineField in class AstTranslator

composeEntityName

protected String composeEntityName(AstTranslator.WalkContext parent,
 CAstEntity f)

Description copied from class: AstTranslator

create the language-appropriate name for f

Specified by:

composeEntityName in class AstTranslator

declareFunction

protected void declareFunction(CAstEntity N,
 AstTranslator.WalkContext context)

Description copied from class: AstTranslator

declare a new function, represented by N

Specified by:

declareFunction in class AstTranslator

defineFunction

protected void defineFunction(CAstEntity N,
 AstTranslator.WalkContext definingContext,
 AbstractCFG<SSAInstruction,? extends IBasicBlock<SSAInstruction>> cfg,
 SymbolTable symtab,
 boolean hasCatchBlock,
 Map<IBasicBlock<SSAInstruction>,TypeReference[]> caughtTypes,
 boolean hasMonitorOp,
 AstTranslator.AstLexicalInformation LI,
 AstMethod.DebuggingInformation debugInfo)

Description copied from class: AstTranslator

fully define a function. invoked after all the code of the function has been processed

Specified by:

defineFunction in class AstTranslator

doThrow

protected void doThrow(AstTranslator.WalkContext context,
 int exception)

Description copied from class: AstTranslator

generate IR for a CAst throw expression, updating context.cfg()

Specified by:

doThrow in class AstTranslator

doCall

protected void doCall(AstTranslator.WalkContext context,
 CAstNode call,
 int result,
 int exception,
 CAstNode name,
 int receiver,
 int[] arguments)

Description copied from class: AstTranslator

generate IR for a CAst method call expression, updating context.cfg()

Specified by:

doCall in class AstTranslator

doNewObject

protected void doNewObject(AstTranslator.WalkContext context,
 CAstNode newNode,
 int result,
 Object type,
 int[] arguments)

Description copied from class: AstTranslator

generate IR for a CAst new expression, updating context.cfg()

Specified by:

doNewObject in class AstTranslator

doMaterializeFunction

protected void doMaterializeFunction(CAstNode n,
 AstTranslator.WalkContext context,
 int result,
 int exception,
 CAstEntity fn)

Description copied from class: AstTranslator

generate IR for a CAst function expression, updating context.cfg()

Specified by:

doMaterializeFunction in class AstTranslator

doArrayRead

public void doArrayRead(AstTranslator.WalkContext context,
 int result,
 int arrayValue,
 CAstNode arrayRef,
 int[] dimValues)

Description copied from class: AstTranslator

generate IR for a CAst array read, updating context.cfg()

Specified by:

doArrayRead in interface ArrayOpHandler

Specified by:

doArrayRead in class AstTranslator

doArrayWrite

public void doArrayWrite(AstTranslator.WalkContext context,
 int arrayValue,
 CAstNode arrayRef,
 int[] dimValues,
 int rval)

Description copied from class: AstTranslator

generate IR for a CAst array write, updating context.cfg()

Specified by:

doArrayWrite in interface ArrayOpHandler

Specified by:

doArrayWrite in class AstTranslator

doFieldRead

protected void doFieldRead(AstTranslator.WalkContext context,
 int result,
 int receiver,
 CAstNode elt,
 CAstNode readNode)

Description copied from class: AstTranslator

generate IR for a CAst field read, updating context.cfg()

Specified by:

doFieldRead in class AstTranslator

doFieldWrite

protected void doFieldWrite(AstTranslator.WalkContext context,
 int receiver,
 CAstNode elt,
 CAstNode parent,
 int rval)

Description copied from class: AstTranslator

generate IR for a CAst field write, updating context.cfg()

Specified by:

doFieldWrite in class AstTranslator

doPrimitive

protected void doPrimitive(int resultVal,
 AstTranslator.WalkContext context,
 CAstNode primitiveCall)

Description copied from class: AstTranslator

generate IR for call modeling creation of primitive value, updating context.cfg()

Specified by:

doPrimitive in class AstTranslator

visitInstanceOf

protected boolean visitInstanceOf(CAstNode n,
 AstTranslator.WalkContext c,
 CAstVisitor<AstTranslator.WalkContext> visitor)

Description copied from class: CAstVisitor

Visit an InstanceOf node.

Overrides:

visitInstanceOf in class CAstVisitor<AstTranslator.WalkContext>

Parameters:

n - the node to process

c - a visitor-specific context

Returns:

true if no further processing is needed

leaveInstanceOf

protected void leaveInstanceOf(CAstNode n,
 AstTranslator.WalkContext c,
 CAstVisitor<AstTranslator.WalkContext> visitor)

Description copied from class: CAstVisitor

Leave an InstanceOf node.

Overrides:

leaveInstanceOf in class CAstVisitor<AstTranslator.WalkContext>

Parameters:

n - the node to process

c - a visitor-specific context

doPrologue

protected void doPrologue(AstTranslator.WalkContext context)

Description copied from class: AstTranslator

generate prologue code for each function body

Overrides:

doPrologue in class AstTranslator

doVisit

protected boolean doVisit(CAstNode n,
 AstTranslator.WalkContext context,
 CAstVisitor<AstTranslator.WalkContext> visitor)

Description copied from class: CAstVisitor

Node processing hook; sub-classes are expected to override if they introduce new node types.

(Should invoke super.doVisit() for unprocessed nodes.)

Overrides:

doVisit in class CAstVisitor<AstTranslator.WalkContext>

Returns:

true if node was handled

topType

protected CAstType topType()

Description copied from class: AstTranslator

the most-general type for the language being translated

Specified by:

topType in class AstTranslator

exceptionType

protected CAstType exceptionType()

Description copied from class: AstTranslator

the most-general exception type for the language being translated

Specified by:

exceptionType in class AstTranslator

getParameterPositions

protected CAstSourcePositionMap.Position[] getParameterPositions(CAstEntity e)

Specified by:

getParameterPositions in class AstTranslator