com.sun.tools.javac.comp
Class Lower.FreeVarCollector

java.lang.Object
  com.sun.tools.javac.tree.JCTree.Visitor
      com.sun.tools.javac.tree.TreeScanner
          com.sun.tools.javac.comp.Lower.FreeVarCollector

Enclosing class:

Lower

 class Lower.FreeVarCollector
extends TreeScanner

A navigator class for collecting the free variables accessed from a local class. There is only one case; all other cases simply traverse down the tree.

Field Summary

(package private) Symbol.ClassSymbol	clazz The local class.
(package private) List<Symbol.VarSymbol>	fvs The list of owner's variables accessed from within the local class, without any duplicates.
(package private) Symbol	owner The owner of the local class.

Constructor Summary

Lower.FreeVarCollector(Symbol.ClassSymbol clazz)

Method Summary

private void	addFreeVar(Symbol.VarSymbol v) Add free variable to fvs list unless it is already there.
private void	addFreeVars(Symbol.ClassSymbol c) Add all free variables of class c to fvs list unless they are already there.
void	visitApply(JCTree.JCMethodInvocation tree) If tree refers to a superclass constructor call, add all free variables of the superclass.
void	visitIdent(JCTree.JCIdent tree) If tree refers to a variable in owner of local class, add it to free variables list.
void	visitNewClass(JCTree.JCNewClass tree) If tree refers to a class instance creation expression add all free variables of the freshly created class.
void	visitSelect(JCTree.JCFieldAccess tree) If tree refers to a qualified this or super expression for anything but the current class, add the outer this stack as a free variable.
private void	visitSymbol(Symbol _sym)

Methods inherited from class com.sun.tools.javac.tree.TreeScanner

scan, scan, visitAnnotation, visitAssert, visitAssign, visitAssignop, visitBinary, visitBlock, visitBracketExpr, visitBreak, visitCase, visitCatch, visitClassDef, visitConditional, visitContinue, visitDoLoop, visitErroneous, visitExec, visitForeachLoop, visitForLoop, visitIf, visitImport, visitIndexed, visitLabelled, visitLetExpr, visitLiteral, visitMethodDef, visitModifiers, visitNewArray, visitParens, visitReturn, visitSkip, visitSwitch, visitSynchronized, visitThrow, visitTopLevel, visitTree, visitTry, visitTypeApply, visitTypeArray, visitTypeBoundKind, visitTypeCast, visitTypeIdent, visitTypeParameter, visitTypeTest, visitUnary, visitVarDef, visitWhileLoop, visitWildcard

Methods inherited from class com.sun.tools.javac.tree.JCTree.Visitor

visitBracketStat, visitEscapeExpr, visitEscapeStat

Methods inherited from class java.lang.Object

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

Field Detail

owner

Symbol owner

The owner of the local class.

clazz

Symbol.ClassSymbol clazz

The local class.

fvs

List<Symbol.VarSymbol> fvs

The list of owner's variables accessed from within the local class, without any duplicates.

Constructor Detail

Lower.FreeVarCollector

Lower.FreeVarCollector(Symbol.ClassSymbol clazz)

Method Detail

addFreeVar

private void addFreeVar(Symbol.VarSymbol v)

Add free variable to fvs list unless it is already there.

addFreeVars

private void addFreeVars(Symbol.ClassSymbol c)

Add all free variables of class c to fvs list unless they are already there.

visitIdent

public void visitIdent(JCTree.JCIdent tree)

If tree refers to a variable in owner of local class, add it to free variables list.

Overrides:

visitIdent in class TreeScanner

visitSymbol

private void visitSymbol(Symbol _sym)

visitNewClass

public void visitNewClass(JCTree.JCNewClass tree)

If tree refers to a class instance creation expression add all free variables of the freshly created class.

Overrides:

visitNewClass in class TreeScanner

visitSelect

public void visitSelect(JCTree.JCFieldAccess tree)

If tree refers to a qualified this or super expression for anything but the current class, add the outer this stack as a free variable.

Overrides:

visitSelect in class TreeScanner

visitApply

public void visitApply(JCTree.JCMethodInvocation tree)

If tree refers to a superclass constructor call, add all free variables of the superclass.

Overrides:

visitApply in class TreeScanner