com.sun.tools.javac.comp: class: Lower.FreeVarCollector

com.sun.tools.javac.comp
class: Lower.FreeVarCollector [javadoc | source]

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

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

Constructor:
FreeVarCollector(ClassSymbol clazz) { this.clazz = clazz; this.owner = clazz.owner; this.fvs = List.nil(); }

Method from com.sun.tools.javac.comp.Lower$FreeVarCollector Summary:
visitApply, visitIdent, visitNewClass, visitSelect

Methods from com.sun.tools.javac.tree.TreeScanner:
scan, scan, visitAnnotation, visitApply, visitAssert, visitAssign, visitAssignop, visitBinary, visitBlock, visitBreak, visitCase, visitCatch, visitClassDef, visitConditional, visitContinue, visitDoLoop, visitErroneous, visitExec, visitForLoop, visitForeachLoop, visitIdent, visitIf, visitImport, visitIndexed, visitLabelled, visitLetExpr, visitLiteral, visitMethodDef, visitModifiers, visitNewArray, visitNewClass, visitParens, visitReturn, visitSelect, visitSkip, visitSwitch, visitSynchronized, visitThrow, visitTopLevel, visitTree, visitTry, visitTypeApply, visitTypeArray, visitTypeBoundKind, visitTypeCast, visitTypeIdent, visitTypeParameter, visitTypeTest, visitTypeUnion, visitUnary, visitVarDef, visitWhileLoop, visitWildcard

Methods from com.sun.tools.javac.tree.TreeScanner:

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

Methods from com.sun.tools.javac.tree.JCTree$Visitor:
visitAnnotation, visitApply, visitAssert, visitAssign, visitAssignop, visitBinary, visitBlock, visitBreak, visitCase, visitCatch, visitClassDef, visitConditional, visitContinue, visitDoLoop, visitErroneous, visitExec, visitForLoop, visitForeachLoop, visitIdent, visitIf, visitImport, visitIndexed, visitLabelled, visitLetExpr, visitLiteral, visitMethodDef, visitModifiers, visitNewArray, visitNewClass, visitParens, visitReturn, visitSelect, visitSkip, visitSwitch, visitSynchronized, visitThrow, visitTopLevel, visitTree, visitTry, visitTypeApply, visitTypeArray, visitTypeBoundKind, visitTypeCast, visitTypeIdent, visitTypeParameter, visitTypeTest, visitTypeUnion, visitUnary, visitVarDef, visitWhileLoop, visitWildcard

Methods from com.sun.tools.javac.tree.JCTree$Visitor:

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

Methods from java.lang.Object:
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method from com.sun.tools.javac.comp.Lower$FreeVarCollector Detail:
public void visitApply(JCMethodInvocation tree) { if (TreeInfo.name(tree.meth) == names._super) { addFreeVars((ClassSymbol) TreeInfo.symbol(tree.meth).owner); Symbol constructor = TreeInfo.symbol(tree.meth); ClassSymbol c = (ClassSymbol)constructor.owner; if (c.hasOuterInstance() && tree.meth.getTag() != JCTree.SELECT && outerThisStack.head != null) visitSymbol(outerThisStack.head); } super.visitApply(tree); } If tree refers to a superclass constructor call, add all free variables of the superclass.
public void visitIdent(JCIdent tree) { result = tree; visitSymbol(tree.sym); } If tree refers to a variable in owner of local class, add it to free variables list.
public void visitNewClass(JCNewClass tree) { ClassSymbol c = (ClassSymbol)tree.constructor.owner; addFreeVars(c); if (tree.encl == null && c.hasOuterInstance() && outerThisStack.head != null) visitSymbol(outerThisStack.head); super.visitNewClass(tree); } If tree refers to a class instance creation expression add all free variables of the freshly created class.
public void visitSelect(JCFieldAccess tree) { if ((tree.name == names._this \|\| tree.name == names._super) && tree.selected.type.tsym != clazz && outerThisStack.head != null) visitSymbol(outerThisStack.head); super.visitSelect(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.

Method from com.sun.tools.javac.comp.Lower$FreeVarCollector Detail:

 public  void visitApply(JCMethodInvocation tree) {
            if (TreeInfo.name(tree.meth) == names._super) {
                addFreeVars((ClassSymbol) TreeInfo.symbol(tree.meth).owner);
                Symbol constructor = TreeInfo.symbol(tree.meth);
                ClassSymbol c = (ClassSymbol)constructor.owner;
                if (c.hasOuterInstance() &&
                    tree.meth.getTag() != JCTree.SELECT &&
                    outerThisStack.head != null)
                    visitSymbol(outerThisStack.head);
            }
            super.visitApply(tree);
}

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

 public  void visitIdent(JCIdent tree) {
            result = tree;
            visitSymbol(tree.sym);
}

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

 public  void visitNewClass(JCNewClass tree) {
            ClassSymbol c = (ClassSymbol)tree.constructor.owner;
            addFreeVars(c);
            if (tree.encl == null &&
                c.hasOuterInstance() &&
                outerThisStack.head != null)
                visitSymbol(outerThisStack.head);
            super.visitNewClass(tree);
}

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

 public  void visitSelect(JCFieldAccess tree) {
            if ((tree.name == names._this || tree.name == names._super) &&
                tree.selected.type.tsym != clazz &&
                outerThisStack.head != null)
                visitSymbol(outerThisStack.head);
            super.visitSelect(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.