Refactored packagename to net.sourceforge.phpdt.internal.compiler.ast
[phpeclipse.git] / net.sourceforge.phpeclipse / src / net / sourceforge / phpdt / internal / compiler / ast / BinaryExpression.java
index 3455363..ce506cb 100644 (file)
+/*******************************************************************************
+ * Copyright (c) 2000, 2003 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials 
+ * are made available under the terms of the Common Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ * 
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
 package net.sourceforge.phpdt.internal.compiler.ast;
 
-import java.util.List;
-import java.util.ArrayList;
+import net.sourceforge.phpdt.internal.compiler.ASTVisitor;
+import net.sourceforge.phpdt.internal.compiler.flow.FlowContext;
+import net.sourceforge.phpdt.internal.compiler.flow.FlowInfo;
+import net.sourceforge.phpdt.internal.compiler.impl.Constant;
+import net.sourceforge.phpdt.internal.compiler.lookup.ArrayBinding;
+import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
+import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
 
-/**
- * @author Matthieu Casanova
- */
 public class BinaryExpression extends OperatorExpression {
 
-  /** The two expressions. */
-  public Expression left,right;
-
-  public BinaryExpression(final Expression left,
-                          final Expression right,
-                          final int operator) {
-    super(operator, left.sourceStart, right.sourceEnd);
-    this.left = left;
-    this.right = right;
-  }
-
-  public String toStringExpression() {
-    final StringBuffer buff = new StringBuffer(left.toStringExpression());
-    buff.append(operatorToString());
-    buff.append(right.toStringExpression());
-    return buff.toString();
-  }
-
-  /**
-   * Get the variables from outside (parameters, globals ...)
-   * @return the variables from outside
-   */
-  public List getOutsideVariable() {
-    return new ArrayList();
-  }
-
-  /**
-   * get the modified variables.
-   * @return the variables from we change value
-   */
-  public List getModifiedVariable() {
-    final ArrayList list = new ArrayList();
-    list.addAll(left.getModifiedVariable());
-    list.addAll(right.getModifiedVariable());
-    return list;
-  }
-
-  /**
-   * Get the variables used.
-   * @return the variables used
-   */
-  public List getUsedVariable() {
-    final ArrayList list = new ArrayList();
-    list.addAll(left.getUsedVariable());
-    list.addAll(right.getUsedVariable());
-    return list;
-  }
+       public Expression left, right;
+       public Constant optimizedBooleanConstant;
 
+       public BinaryExpression(Expression left, Expression right, int operator) {
+
+               this.left = left;
+               this.right = right;
+               this.bits |= operator << OperatorSHIFT; // encode operator
+               this.sourceStart = left.sourceStart;
+               this.sourceEnd = right.sourceEnd;
+       }
+
+       public FlowInfo analyseCode(
+               BlockScope currentScope,
+               FlowContext flowContext,
+               FlowInfo flowInfo) {
+
+               return right
+                       .analyseCode(
+                               currentScope,
+                               flowContext,
+                               left.analyseCode(currentScope, flowContext, flowInfo).unconditionalInits())
+                       .unconditionalInits();
+       }
+
+       public void computeConstant(BlockScope scope, int leftId, int rightId) {
+
+               //compute the constant when valid
+               if ((this.left.constant != Constant.NotAConstant)
+                       && (this.right.constant != Constant.NotAConstant)) {
+                       try {
+                               this.constant =
+                                       Constant.computeConstantOperation(
+                                               this.left.constant,
+                                               leftId,
+                                               (this.bits & OperatorMASK) >> OperatorSHIFT,
+                                               this.right.constant,
+                                               rightId);
+                       } catch (ArithmeticException e) {
+                               this.constant = Constant.NotAConstant;
+                               // 1.2 no longer throws an exception at compile-time
+                               //scope.problemReporter().compileTimeConstantThrowsArithmeticException(this);
+                       }
+               } else {
+                       this.constant = Constant.NotAConstant;
+                       //add some work for the boolean operators & |  
+//                     this.optimizedBooleanConstant(
+//                             leftId,
+//                             (this.bits & OperatorMASK) >> OperatorSHIFT,
+//                             rightId);
+               }
+       }
+
+       public Constant optimizedBooleanConstant() {
+
+               return this.optimizedBooleanConstant == null ? this.constant : this.optimizedBooleanConstant;
+       }
+
+       /**
+        * Code generation for a binary operation
+        */
+//     public void generateCode(
+//             BlockScope currentScope,
+//             CodeStream codeStream,
+//             boolean valueRequired) {
+//
+//             int pc = codeStream.position;
+//             Label falseLabel, endLabel;
+//             if (constant != Constant.NotAConstant) {
+//                     if (valueRequired)
+//                             codeStream.generateConstant(constant, implicitConversion);
+//                     codeStream.recordPositionsFrom(pc, this.sourceStart);
+//                     return;
+//             }
+//             bits |= OnlyValueRequiredMASK;
+//             switch ((bits & OperatorMASK) >> OperatorSHIFT) {
+//                     case PLUS :
+//                             switch (bits & ReturnTypeIDMASK) {
+//                                     case T_String :
+//                                             codeStream.generateStringAppend(currentScope, left, right);
+//                                             if (!valueRequired)
+//                                                     codeStream.pop();
+//                                             break;
+//                                     case T_int :
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                             if (valueRequired)
+//                                                     codeStream.iadd();
+//                                             break;
+//                                     case T_long :
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                             if (valueRequired)
+//                                                     codeStream.ladd();
+//                                             break;
+//                                     case T_double :
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                             if (valueRequired)
+//                                                     codeStream.dadd();
+//                                             break;
+//                                     case T_float :
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                             if (valueRequired)
+//                                                     codeStream.fadd();
+//                                             break;
+//                             }
+//                             break;
+//                     case MINUS :
+//                             switch (bits & ReturnTypeIDMASK) {
+//                                     case T_int :
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                             if (valueRequired)
+//                                                     codeStream.isub();
+//                                             break;
+//                                     case T_long :
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                             if (valueRequired)
+//                                                     codeStream.lsub();
+//                                             break;
+//                                     case T_double :
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                             if (valueRequired)
+//                                                     codeStream.dsub();
+//                                             break;
+//                                     case T_float :
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                             if (valueRequired)
+//                                                     codeStream.fsub();
+//                                             break;
+//                             }
+//                             break;
+//                     case MULTIPLY :
+//                             switch (bits & ReturnTypeIDMASK) {
+//                                     case T_int :
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                             if (valueRequired)
+//                                                     codeStream.imul();
+//                                             break;
+//                                     case T_long :
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                             if (valueRequired)
+//                                                     codeStream.lmul();
+//                                             break;
+//                                     case T_double :
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                             if (valueRequired)
+//                                                     codeStream.dmul();
+//                                             break;
+//                                     case T_float :
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                             if (valueRequired)
+//                                                     codeStream.fmul();
+//                                             break;
+//                             }
+//                             break;
+//                     case DIVIDE :
+//                             switch (bits & ReturnTypeIDMASK) {
+//                                     case T_int :
+//                                             left.generateCode(currentScope, codeStream, true);
+//                                             right.generateCode(currentScope, codeStream, true);
+//                                             codeStream.idiv();
+//                                             if (!valueRequired)
+//                                                     codeStream.pop();
+//                                             break;
+//                                     case T_long :
+//                                             left.generateCode(currentScope, codeStream, true);
+//                                             right.generateCode(currentScope, codeStream, true);
+//                                             codeStream.ldiv();
+//                                             if (!valueRequired)
+//                                                     codeStream.pop2();
+//                                             break;
+//                                     case T_double :
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                             if (valueRequired)
+//                                                     codeStream.ddiv();
+//                                             break;
+//                                     case T_float :
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                             if (valueRequired)
+//                                                     codeStream.fdiv();
+//                                             break;
+//                             }
+//                             break;
+//                     case REMAINDER :
+//                             switch (bits & ReturnTypeIDMASK) {
+//                                     case T_int :
+//                                             left.generateCode(currentScope, codeStream, true);
+//                                             right.generateCode(currentScope, codeStream, true);
+//                                             codeStream.irem();
+//                                             if (!valueRequired)
+//                                                     codeStream.pop();
+//                                             break;
+//                                     case T_long :
+//                                             left.generateCode(currentScope, codeStream, true);
+//                                             right.generateCode(currentScope, codeStream, true);
+//                                             codeStream.lrem();
+//                                             if (!valueRequired)
+//                                                     codeStream.pop2();
+//                                             break;
+//                                     case T_double :
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                             if (valueRequired)
+//                                                     codeStream.drem();
+//                                             break;
+//                                     case T_float :
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                             if (valueRequired)
+//                                                     codeStream.frem();
+//                                             break;
+//                             }
+//                             break;
+//                     case AND :
+//                             switch (bits & ReturnTypeIDMASK) {
+//                                     case T_int :
+//                                             // 0 & x
+//                                             if ((left.constant != Constant.NotAConstant)
+//                                                     && (left.constant.typeID() == T_int)
+//                                                     && (left.constant.intValue() == 0)) {
+//                                                     right.generateCode(currentScope, codeStream, false);
+//                                                     if (valueRequired)
+//                                                             codeStream.iconst_0();
+//                                             } else {
+//                                                     // x & 0
+//                                                     if ((right.constant != Constant.NotAConstant)
+//                                                             && (right.constant.typeID() == T_int)
+//                                                             && (right.constant.intValue() == 0)) {
+//                                                             left.generateCode(currentScope, codeStream, false);
+//                                                             if (valueRequired)
+//                                                                     codeStream.iconst_0();
+//                                                     } else {
+//                                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                                             if (valueRequired)
+//                                                                     codeStream.iand();
+//                                                     }
+//                                             }
+//                                             break;
+//                                     case T_long :
+//                                             // 0 & x
+//                                             if ((left.constant != Constant.NotAConstant)
+//                                                     && (left.constant.typeID() == T_long)
+//                                                     && (left.constant.longValue() == 0L)) {
+//                                                     right.generateCode(currentScope, codeStream, false);
+//                                                     if (valueRequired)
+//                                                             codeStream.lconst_0();
+//                                             } else {
+//                                                     // x & 0
+//                                                     if ((right.constant != Constant.NotAConstant)
+//                                                             && (right.constant.typeID() == T_long)
+//                                                             && (right.constant.longValue() == 0L)) {
+//                                                             left.generateCode(currentScope, codeStream, false);
+//                                                             if (valueRequired)
+//                                                                     codeStream.lconst_0();
+//                                                     } else {
+//                                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                                             if (valueRequired)
+//                                                                     codeStream.land();
+//                                                     }
+//                                             }
+//                                             break;
+//                                     case T_boolean : // logical and
+//                                             generateOptimizedLogicalAnd(
+//                                                     currentScope,
+//                                                     codeStream,
+//                                                     null,
+//                                                     (falseLabel = new Label(codeStream)),
+//                                                     valueRequired);
+//                                             /* improving code gen for such a case: boolean b = i < 0 && false;
+//                                              * since the label has never been used, we have the inlined value on the stack. */
+//                                             if (falseLabel.hasForwardReferences()) {
+//                                                     if (valueRequired) {
+//                                                             codeStream.iconst_1();
+//                                                             if ((bits & ValueForReturnMASK) != 0) {
+//                                                                     codeStream.ireturn();
+//                                                                     falseLabel.place();
+//                                                                     codeStream.iconst_0();
+//                                                             } else {
+//                                                                     codeStream.goto_(endLabel = new Label(codeStream));
+//                                                                     codeStream.decrStackSize(1);
+//                                                                     falseLabel.place();
+//                                                                     codeStream.iconst_0();
+//                                                                     endLabel.place();
+//                                                             }
+//                                                     } else {
+//                                                             falseLabel.place();
+//                                                     }
+//                                             }
+//                             }
+//                             break;
+//                     case OR :
+//                             switch (bits & ReturnTypeIDMASK) {
+//                                     case T_int :
+//                                             // 0 | x
+//                                             if ((left.constant != Constant.NotAConstant)
+//                                                     && (left.constant.typeID() == T_int)
+//                                                     && (left.constant.intValue() == 0)) {
+//                                                     right.generateCode(currentScope, codeStream, valueRequired);
+//                                             } else {
+//                                                     // x | 0
+//                                                     if ((right.constant != Constant.NotAConstant)
+//                                                             && (right.constant.typeID() == T_int)
+//                                                             && (right.constant.intValue() == 0)) {
+//                                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                                     } else {
+//                                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                                             if (valueRequired)
+//                                                                     codeStream.ior();
+//                                                     }
+//                                             }
+//                                             break;
+//                                     case T_long :
+//                                             // 0 | x
+//                                             if ((left.constant != Constant.NotAConstant)
+//                                                     && (left.constant.typeID() == T_long)
+//                                                     && (left.constant.longValue() == 0L)) {
+//                                                     right.generateCode(currentScope, codeStream, valueRequired);
+//                                             } else {
+//                                                     // x | 0
+//                                                     if ((right.constant != Constant.NotAConstant)
+//                                                             && (right.constant.typeID() == T_long)
+//                                                             && (right.constant.longValue() == 0L)) {
+//                                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                                     } else {
+//                                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                                             if (valueRequired)
+//                                                                     codeStream.lor();
+//                                                     }
+//                                             }
+//                                             break;
+//                                     case T_boolean : // logical or
+//                                             generateOptimizedLogicalOr(
+//                                                     currentScope,
+//                                                     codeStream,
+//                                                     null,
+//                                                     (falseLabel = new Label(codeStream)),
+//                                                     valueRequired);
+//                                             /* improving code gen for such a case: boolean b = i < 0 || true;
+//                                              * since the label has never been used, we have the inlined value on the stack. */
+//                                             if (falseLabel.hasForwardReferences()) {
+//                                                     if (valueRequired) {
+//                                                             codeStream.iconst_1();
+//                                                             if ((bits & ValueForReturnMASK) != 0) {
+//                                                                     codeStream.ireturn();
+//                                                                     falseLabel.place();
+//                                                                     codeStream.iconst_0();
+//                                                             } else {
+//                                                                     codeStream.goto_(endLabel = new Label(codeStream));
+//                                                                     codeStream.decrStackSize(1);
+//                                                                     falseLabel.place();
+//                                                                     codeStream.iconst_0();
+//                                                                     endLabel.place();
+//                                                             }
+//                                                     } else {
+//                                                             falseLabel.place();
+//                                                     }
+//                                             }
+//                             }
+//                             break;
+//                     case XOR :
+//                             switch (bits & ReturnTypeIDMASK) {
+//                                     case T_int :
+//                                             // 0 ^ x
+//                                             if ((left.constant != Constant.NotAConstant)
+//                                                     && (left.constant.typeID() == T_int)
+//                                                     && (left.constant.intValue() == 0)) {
+//                                                     right.generateCode(currentScope, codeStream, valueRequired);
+//                                             } else {
+//                                                     // x ^ 0
+//                                                     if ((right.constant != Constant.NotAConstant)
+//                                                             && (right.constant.typeID() == T_int)
+//                                                             && (right.constant.intValue() == 0)) {
+//                                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                                     } else {
+//                                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                                             if (valueRequired)
+//                                                                     codeStream.ixor();
+//                                                     }
+//                                             }
+//                                             break;
+//                                     case T_long :
+//                                             // 0 ^ x
+//                                             if ((left.constant != Constant.NotAConstant)
+//                                                     && (left.constant.typeID() == T_long)
+//                                                     && (left.constant.longValue() == 0L)) {
+//                                                     right.generateCode(currentScope, codeStream, valueRequired);
+//                                             } else {
+//                                                     // x ^ 0
+//                                                     if ((right.constant != Constant.NotAConstant)
+//                                                             && (right.constant.typeID() == T_long)
+//                                                             && (right.constant.longValue() == 0L)) {
+//                                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                                     } else {
+//                                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                                             if (valueRequired)
+//                                                                     codeStream.lxor();
+//                                                     }
+//                                             }
+//                                             break;
+//                                     case T_boolean :
+//                                             generateOptimizedLogicalXor(
+//                                                     currentScope,
+//                                                     codeStream,
+//                                                     null,
+//                                                     (falseLabel = new Label(codeStream)),
+//                                                     valueRequired);
+//                                             /* improving code gen for such a case: boolean b = i < 0 ^ bool;
+//                                              * since the label has never been used, we have the inlined value on the stack. */
+//                                             if (falseLabel.hasForwardReferences()) {
+//                                                     if (valueRequired) {
+//                                                             codeStream.iconst_1();
+//                                                             if ((bits & ValueForReturnMASK) != 0) {
+//                                                                     codeStream.ireturn();
+//                                                                     falseLabel.place();
+//                                                                     codeStream.iconst_0();
+//                                                             } else {
+//                                                                     codeStream.goto_(endLabel = new Label(codeStream));
+//                                                                     codeStream.decrStackSize(1);
+//                                                                     falseLabel.place();
+//                                                                     codeStream.iconst_0();
+//                                                                     endLabel.place();
+//                                                             }
+//                                                     } else {
+//                                                             falseLabel.place();
+//                                                     }
+//                                             }
+//                             }
+//                             break;
+//                     case LEFT_SHIFT :
+//                             switch (bits & ReturnTypeIDMASK) {
+//                                     case T_int :
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                             if (valueRequired)
+//                                                     codeStream.ishl();
+//                                             break;
+//                                     case T_long :
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                             if (valueRequired)
+//                                                     codeStream.lshl();
+//                             }
+//                             break;
+//                     case RIGHT_SHIFT :
+//                             switch (bits & ReturnTypeIDMASK) {
+//                                     case T_int :
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                             if (valueRequired)
+//                                                     codeStream.ishr();
+//                                             break;
+//                                     case T_long :
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                             if (valueRequired)
+//                                                     codeStream.lshr();
+//                             }
+//                             break;
+//                     case UNSIGNED_RIGHT_SHIFT :
+//                             switch (bits & ReturnTypeIDMASK) {
+//                                     case T_int :
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                             if (valueRequired)
+//                                                     codeStream.iushr();
+//                                             break;
+//                                     case T_long :
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                             if (valueRequired)
+//                                                     codeStream.lushr();
+//                             }
+//                             break;
+//                     case GREATER :
+//                             generateOptimizedGreaterThan(
+//                                     currentScope,
+//                                     codeStream,
+//                                     null,
+//                                     (falseLabel = new Label(codeStream)),
+//                                     valueRequired);
+//                             if (valueRequired) {
+//                                     codeStream.iconst_1();
+//                                     if ((bits & ValueForReturnMASK) != 0) {
+//                                             codeStream.ireturn();
+//                                             falseLabel.place();
+//                                             codeStream.iconst_0();
+//                                     } else {
+//                                             codeStream.goto_(endLabel = new Label(codeStream));
+//                                             codeStream.decrStackSize(1);
+//                                             falseLabel.place();
+//                                             codeStream.iconst_0();
+//                                             endLabel.place();
+//                                     }
+//                             }
+//                             break;
+//                     case GREATER_EQUAL :
+//                             generateOptimizedGreaterThanOrEqual(
+//                                     currentScope,
+//                                     codeStream,
+//                                     null,
+//                                     (falseLabel = new Label(codeStream)),
+//                                     valueRequired);
+//                             if (valueRequired) {
+//                                     codeStream.iconst_1();
+//                                     if ((bits & ValueForReturnMASK) != 0) {
+//                                             codeStream.ireturn();
+//                                             falseLabel.place();
+//                                             codeStream.iconst_0();
+//                                     } else {
+//                                             codeStream.goto_(endLabel = new Label(codeStream));
+//                                             codeStream.decrStackSize(1);
+//                                             falseLabel.place();
+//                                             codeStream.iconst_0();
+//                                             endLabel.place();
+//                                     }
+//                             }
+//                             break;
+//                     case LESS :
+//                             generateOptimizedLessThan(
+//                                     currentScope,
+//                                     codeStream,
+//                                     null,
+//                                     (falseLabel = new Label(codeStream)),
+//                                     valueRequired);
+//                             if (valueRequired) {
+//                                     codeStream.iconst_1();
+//                                     if ((bits & ValueForReturnMASK) != 0) {
+//                                             codeStream.ireturn();
+//                                             falseLabel.place();
+//                                             codeStream.iconst_0();
+//                                     } else {
+//                                             codeStream.goto_(endLabel = new Label(codeStream));
+//                                             codeStream.decrStackSize(1);
+//                                             falseLabel.place();
+//                                             codeStream.iconst_0();
+//                                             endLabel.place();
+//                                     }
+//                             }
+//                             break;
+//                     case LESS_EQUAL :
+//                             generateOptimizedLessThanOrEqual(
+//                                     currentScope,
+//                                     codeStream,
+//                                     null,
+//                                     (falseLabel = new Label(codeStream)),
+//                                     valueRequired);
+//                             if (valueRequired) {
+//                                     codeStream.iconst_1();
+//                                     if ((bits & ValueForReturnMASK) != 0) {
+//                                             codeStream.ireturn();
+//                                             falseLabel.place();
+//                                             codeStream.iconst_0();
+//                                     } else {
+//                                             codeStream.goto_(endLabel = new Label(codeStream));
+//                                             codeStream.decrStackSize(1);
+//                                             falseLabel.place();
+//                                             codeStream.iconst_0();
+//                                             endLabel.place();
+//                                     }
+//                             }
+//             }
+//             if (valueRequired) {
+//                     codeStream.generateImplicitConversion(implicitConversion);
+//             }
+//             codeStream.recordPositionsFrom(pc, this.sourceStart);
+//     }
+
+       /**
+        * Boolean operator code generation
+        *      Optimized operations are: <, <=, >, >=, &, |, ^
+        */
+//     public void generateOptimizedBoolean(
+//             BlockScope currentScope,
+//             CodeStream codeStream,
+//             Label trueLabel,
+//             Label falseLabel,
+//             boolean valueRequired) {
+//
+//             if ((constant != Constant.NotAConstant) && (constant.typeID() == T_boolean)) {
+//                     super.generateOptimizedBoolean(
+//                             currentScope,
+//                             codeStream,
+//                             trueLabel,
+//                             falseLabel,
+//                             valueRequired);
+//                     return;
+//             }
+//             switch ((bits & OperatorMASK) >> OperatorSHIFT) {
+//                     case LESS :
+//                             generateOptimizedLessThan(
+//                                     currentScope,
+//                                     codeStream,
+//                                     trueLabel,
+//                                     falseLabel,
+//                                     valueRequired);
+//                             return;
+//                     case LESS_EQUAL :
+//                             generateOptimizedLessThanOrEqual(
+//                                     currentScope,
+//                                     codeStream,
+//                                     trueLabel,
+//                                     falseLabel,
+//                                     valueRequired);
+//                             return;
+//                     case GREATER :
+//                             generateOptimizedGreaterThan(
+//                                     currentScope,
+//                                     codeStream,
+//                                     trueLabel,
+//                                     falseLabel,
+//                                     valueRequired);
+//                             return;
+//                     case GREATER_EQUAL :
+//                             generateOptimizedGreaterThanOrEqual(
+//                                     currentScope,
+//                                     codeStream,
+//                                     trueLabel,
+//                                     falseLabel,
+//                                     valueRequired);
+//                             return;
+//                     case AND :
+//                             generateOptimizedLogicalAnd(
+//                                     currentScope,
+//                                     codeStream,
+//                                     trueLabel,
+//                                     falseLabel,
+//                                     valueRequired);
+//                             return;
+//                     case OR :
+//                             generateOptimizedLogicalOr(
+//                                     currentScope,
+//                                     codeStream,
+//                                     trueLabel,
+//                                     falseLabel,
+//                                     valueRequired);
+//                             return;
+//                     case XOR :
+//                             generateOptimizedLogicalXor(
+//                                     currentScope,
+//                                     codeStream,
+//                                     trueLabel,
+//                                     falseLabel,
+//                                     valueRequired);
+//                             return;
+//             }
+//             super.generateOptimizedBoolean(
+//                     currentScope,
+//                     codeStream,
+//                     trueLabel,
+//                     falseLabel,
+//                     valueRequired);
+//     }
+//
+//     /**
+//      * Boolean generation for >
+//      */
+//     public void generateOptimizedGreaterThan(
+//             BlockScope currentScope,
+//             CodeStream codeStream,
+//             Label trueLabel,
+//             Label falseLabel,
+//             boolean valueRequired) {
+//
+//             int promotedTypeID = left.implicitConversion >> 4;
+//             // both sides got promoted in the same way
+//             if (promotedTypeID == T_int) {
+//                     // 0 > x
+//                     if ((left.constant != NotAConstant) && (left.constant.intValue() == 0)) {
+//                             right.generateCode(currentScope, codeStream, valueRequired);
+//                             if (valueRequired) {
+//                                     if (falseLabel == null) {
+//                                             if (trueLabel != null) {
+//                                                     // implicitly falling through the FALSE case
+//                                                     codeStream.iflt(trueLabel);
+//                                             }
+//                                     } else {
+//                                             if (trueLabel == null) {
+//                                                     // implicitly falling through the TRUE case
+//                                                     codeStream.ifge(falseLabel);
+//                                             } else {
+//                                                     // no implicit fall through TRUE/FALSE --> should never occur
+//                                             }
+//                                     }
+//                             }
+//                             // reposition the endPC
+//                             codeStream.updateLastRecordedEndPC(codeStream.position);                                        
+//                             return;
+//                     }
+//                     // x > 0
+//                     if ((right.constant != NotAConstant) && (right.constant.intValue() == 0)) {
+//                             left.generateCode(currentScope, codeStream, valueRequired);
+//                             if (valueRequired) {
+//                                     if (falseLabel == null) {
+//                                             if (trueLabel != null) {
+//                                                     // implicitly falling through the FALSE case
+//                                                     codeStream.ifgt(trueLabel);
+//                                             }
+//                                     } else {
+//                                             if (trueLabel == null) {
+//                                                     // implicitly falling through the TRUE case
+//                                                     codeStream.ifle(falseLabel);
+//                                             } else {
+//                                                     // no implicit fall through TRUE/FALSE --> should never occur
+//                                             }
+//                                     }
+//                             }
+//                             // reposition the endPC
+//                             codeStream.updateLastRecordedEndPC(codeStream.position);                                        
+//                             return;
+//                     }
+//             }
+//             // default comparison
+//             left.generateCode(currentScope, codeStream, valueRequired);
+//             right.generateCode(currentScope, codeStream, valueRequired);
+//             if (valueRequired) {
+//                     if (falseLabel == null) {
+//                             if (trueLabel != null) {
+//                                     // implicit falling through the FALSE case
+//                                     switch (promotedTypeID) {
+//                                             case T_int :
+//                                                     codeStream.if_icmpgt(trueLabel);
+//                                                     break;
+//                                             case T_float :
+//                                                     codeStream.fcmpl();
+//                                                     codeStream.ifgt(trueLabel);
+//                                                     break;
+//                                             case T_long :
+//                                                     codeStream.lcmp();
+//                                                     codeStream.ifgt(trueLabel);
+//                                                     break;
+//                                             case T_double :
+//                                                     codeStream.dcmpl();
+//                                                     codeStream.ifgt(trueLabel);
+//                                     }
+//                                     // reposition the endPC
+//                                     codeStream.updateLastRecordedEndPC(codeStream.position);                                        
+//                                     return;
+//                             }
+//                     } else {
+//                             if (trueLabel == null) {
+//                                     // implicit falling through the TRUE case
+//                                     switch (promotedTypeID) {
+//                                             case T_int :
+//                                                     codeStream.if_icmple(falseLabel);
+//                                                     break;
+//                                             case T_float :
+//                                                     codeStream.fcmpl();
+//                                                     codeStream.ifle(falseLabel);
+//                                                     break;
+//                                             case T_long :
+//                                                     codeStream.lcmp();
+//                                                     codeStream.ifle(falseLabel);
+//                                                     break;
+//                                             case T_double :
+//                                                     codeStream.dcmpl();
+//                                                     codeStream.ifle(falseLabel);
+//                                     }
+//                                     // reposition the endPC
+//                                     codeStream.updateLastRecordedEndPC(codeStream.position);                                        
+//                                     return;
+//                             } else {
+//                                     // no implicit fall through TRUE/FALSE --> should never occur
+//                             }
+//                     }
+//             }
+//     }
+
+       /**
+        * Boolean generation for >=
+        */
+//     public void generateOptimizedGreaterThanOrEqual(
+//             BlockScope currentScope,
+//             CodeStream codeStream,
+//             Label trueLabel,
+//             Label falseLabel,
+//             boolean valueRequired) {
+//
+//             int promotedTypeID = left.implicitConversion >> 4;
+//             // both sides got promoted in the same way
+//             if (promotedTypeID == T_int) {
+//                     // 0 >= x
+//                     if ((left.constant != NotAConstant) && (left.constant.intValue() == 0)) {
+//                             right.generateCode(currentScope, codeStream, valueRequired);
+//                             if (valueRequired) {
+//                                     if (falseLabel == null) {
+//                                             if (trueLabel != null) {
+//                                                     // implicitly falling through the FALSE case
+//                                                     codeStream.ifle(trueLabel);
+//                                             }
+//                                     } else {
+//                                             if (trueLabel == null) {
+//                                                     // implicitly falling through the TRUE case
+//                                                     codeStream.ifgt(falseLabel);
+//                                             } else {
+//                                                     // no implicit fall through TRUE/FALSE --> should never occur
+//                                             }
+//                                     }
+//                             }
+//                             // reposition the endPC
+//                             codeStream.updateLastRecordedEndPC(codeStream.position);                                        
+//                             return;
+//                     }
+//                     // x >= 0
+//                     if ((right.constant != NotAConstant) && (right.constant.intValue() == 0)) {
+//                             left.generateCode(currentScope, codeStream, valueRequired);
+//                             if (valueRequired) {
+//                                     if (falseLabel == null) {
+//                                             if (trueLabel != null) {
+//                                                     // implicitly falling through the FALSE case
+//                                                     codeStream.ifge(trueLabel);
+//                                             }
+//                                     } else {
+//                                             if (trueLabel == null) {
+//                                                     // implicitly falling through the TRUE case
+//                                                     codeStream.iflt(falseLabel);
+//                                             } else {
+//                                                     // no implicit fall through TRUE/FALSE --> should never occur
+//                                             }
+//                                     }
+//                             }
+//                             // reposition the endPC
+//                             codeStream.updateLastRecordedEndPC(codeStream.position);                                        
+//                             return;
+//                     }
+//             }
+//             // default comparison
+//             left.generateCode(currentScope, codeStream, valueRequired);
+//             right.generateCode(currentScope, codeStream, valueRequired);
+//             if (valueRequired) {
+//                     if (falseLabel == null) {
+//                             if (trueLabel != null) {
+//                                     // implicit falling through the FALSE case
+//                                     switch (promotedTypeID) {
+//                                             case T_int :
+//                                                     codeStream.if_icmpge(trueLabel);
+//                                                     break;
+//                                             case T_float :
+//                                                     codeStream.fcmpl();
+//                                                     codeStream.ifge(trueLabel);
+//                                                     break;
+//                                             case T_long :
+//                                                     codeStream.lcmp();
+//                                                     codeStream.ifge(trueLabel);
+//                                                     break;
+//                                             case T_double :
+//                                                     codeStream.dcmpl();
+//                                                     codeStream.ifge(trueLabel);
+//                                     }
+//                                     // reposition the endPC
+//                                     codeStream.updateLastRecordedEndPC(codeStream.position);                                        
+//                                     return;
+//                             }
+//                     } else {
+//                             if (trueLabel == null) {
+//                                     // implicit falling through the TRUE case
+//                                     switch (promotedTypeID) {
+//                                             case T_int :
+//                                                     codeStream.if_icmplt(falseLabel);
+//                                                     break;
+//                                             case T_float :
+//                                                     codeStream.fcmpl();
+//                                                     codeStream.iflt(falseLabel);
+//                                                     break;
+//                                             case T_long :
+//                                                     codeStream.lcmp();
+//                                                     codeStream.iflt(falseLabel);
+//                                                     break;
+//                                             case T_double :
+//                                                     codeStream.dcmpl();
+//                                                     codeStream.iflt(falseLabel);
+//                                     }
+//                                     // reposition the endPC
+//                                     codeStream.updateLastRecordedEndPC(codeStream.position);                                        
+//                                     return;
+//                             } else {
+//                                     // no implicit fall through TRUE/FALSE --> should never occur
+//                             }
+//                     }
+//             }
+//     }
+//
+//     /**
+//      * Boolean generation for <
+//      */
+//     public void generateOptimizedLessThan(
+//             BlockScope currentScope,
+//             CodeStream codeStream,
+//             Label trueLabel,
+//             Label falseLabel,
+//             boolean valueRequired) {
+//
+//             int promotedTypeID = left.implicitConversion >> 4;
+//             // both sides got promoted in the same way
+//             if (promotedTypeID == T_int) {
+//                     // 0 < x
+//                     if ((left.constant != NotAConstant) && (left.constant.intValue() == 0)) {
+//                             right.generateCode(currentScope, codeStream, valueRequired);
+//                             if (valueRequired) {
+//                                     if (falseLabel == null) {
+//                                             if (trueLabel != null) {
+//                                                     // implicitly falling through the FALSE case
+//                                                     codeStream.ifgt(trueLabel);
+//                                             }
+//                                     } else {
+//                                             if (trueLabel == null) {
+//                                                     // implicitly falling through the TRUE case
+//                                                     codeStream.ifle(falseLabel);
+//                                             } else {
+//                                                     // no implicit fall through TRUE/FALSE --> should never occur
+//                                             }
+//                                     }
+//                             }
+//                             codeStream.updateLastRecordedEndPC(codeStream.position);
+//                             return;
+//                     }
+//                     // x < 0
+//                     if ((right.constant != NotAConstant) && (right.constant.intValue() == 0)) {
+//                             left.generateCode(currentScope, codeStream, valueRequired);
+//                             if (valueRequired) {
+//                                     if (falseLabel == null) {
+//                                             if (trueLabel != null) {
+//                                                     // implicitly falling through the FALSE case
+//                                                     codeStream.iflt(trueLabel);
+//                                             }
+//                                     } else {
+//                                             if (trueLabel == null) {
+//                                                     // implicitly falling through the TRUE case
+//                                                     codeStream.ifge(falseLabel);
+//                                             } else {
+//                                                     // no implicit fall through TRUE/FALSE --> should never occur
+//                                             }
+//                                     }
+//                             }
+//                             codeStream.updateLastRecordedEndPC(codeStream.position);
+//                             return;
+//                     }
+//             }
+//             // default comparison
+//             left.generateCode(currentScope, codeStream, valueRequired);
+//             right.generateCode(currentScope, codeStream, valueRequired);
+//             if (valueRequired) {
+//                     if (falseLabel == null) {
+//                             if (trueLabel != null) {
+//                                     // implicit falling through the FALSE case
+//                                     switch (promotedTypeID) {
+//                                             case T_int :
+//                                                     codeStream.if_icmplt(trueLabel);
+//                                                     break;
+//                                             case T_float :
+//                                                     codeStream.fcmpg();
+//                                                     codeStream.iflt(trueLabel);
+//                                                     break;
+//                                             case T_long :
+//                                                     codeStream.lcmp();
+//                                                     codeStream.iflt(trueLabel);
+//                                                     break;
+//                                             case T_double :
+//                                                     codeStream.dcmpg();
+//                                                     codeStream.iflt(trueLabel);
+//                                     }
+//                                     codeStream.updateLastRecordedEndPC(codeStream.position);
+//                                     return;
+//                             }
+//                     } else {
+//                             if (trueLabel == null) {
+//                                     // implicit falling through the TRUE case
+//                                     switch (promotedTypeID) {
+//                                             case T_int :
+//                                                     codeStream.if_icmpge(falseLabel);
+//                                                     break;
+//                                             case T_float :
+//                                                     codeStream.fcmpg();
+//                                                     codeStream.ifge(falseLabel);
+//                                                     break;
+//                                             case T_long :
+//                                                     codeStream.lcmp();
+//                                                     codeStream.ifge(falseLabel);
+//                                                     break;
+//                                             case T_double :
+//                                                     codeStream.dcmpg();
+//                                                     codeStream.ifge(falseLabel);
+//                                     }
+//                                     codeStream.updateLastRecordedEndPC(codeStream.position);
+//                                     return;
+//                             } else {
+//                                     // no implicit fall through TRUE/FALSE --> should never occur
+//                             }
+//                     }
+//             }
+//     }
+//     
+//     /**
+//      * Boolean generation for <=
+//      */
+//     public void generateOptimizedLessThanOrEqual(
+//             BlockScope currentScope,
+//             CodeStream codeStream,
+//             Label trueLabel,
+//             Label falseLabel,
+//             boolean valueRequired) {
+//
+//             int promotedTypeID = left.implicitConversion >> 4;
+//             // both sides got promoted in the same way
+//             if (promotedTypeID == T_int) {
+//                     // 0 <= x
+//                     if ((left.constant != NotAConstant) && (left.constant.intValue() == 0)) {
+//                             right.generateCode(currentScope, codeStream, valueRequired);
+//                             if (valueRequired) {
+//                                     if (falseLabel == null) {
+//                                             if (trueLabel != null) {
+//                                                     // implicitly falling through the FALSE case
+//                                                     codeStream.ifge(trueLabel);
+//                                             }
+//                                     } else {
+//                                             if (trueLabel == null) {
+//                                                     // implicitly falling through the TRUE case
+//                                                     codeStream.iflt(falseLabel);
+//                                             } else {
+//                                                     // no implicit fall through TRUE/FALSE --> should never occur
+//                                             }
+//                                     }
+//                             }
+//                             // reposition the endPC
+//                             codeStream.updateLastRecordedEndPC(codeStream.position);                                        
+//                             return;
+//                     }
+//                     // x <= 0
+//                     if ((right.constant != NotAConstant) && (right.constant.intValue() == 0)) {
+//                             left.generateCode(currentScope, codeStream, valueRequired);
+//                             if (valueRequired) {
+//                                     if (falseLabel == null) {
+//                                             if (trueLabel != null) {
+//                                                     // implicitly falling through the FALSE case
+//                                                     codeStream.ifle(trueLabel);
+//                                             }
+//                                     } else {
+//                                             if (trueLabel == null) {
+//                                                     // implicitly falling through the TRUE case
+//                                                     codeStream.ifgt(falseLabel);
+//                                             } else {
+//                                                     // no implicit fall through TRUE/FALSE --> should never occur
+//                                             }
+//                                     }
+//                             }
+//                             // reposition the endPC
+//                             codeStream.updateLastRecordedEndPC(codeStream.position);                                        
+//                             return;
+//                     }
+//             }
+//             // default comparison
+//             left.generateCode(currentScope, codeStream, valueRequired);
+//             right.generateCode(currentScope, codeStream, valueRequired);
+//             if (valueRequired) {
+//                     if (falseLabel == null) {
+//                             if (trueLabel != null) {
+//                                     // implicit falling through the FALSE case
+//                                     switch (promotedTypeID) {
+//                                             case T_int :
+//                                                     codeStream.if_icmple(trueLabel);
+//                                                     break;
+//                                             case T_float :
+//                                                     codeStream.fcmpg();
+//                                                     codeStream.ifle(trueLabel);
+//                                                     break;
+//                                             case T_long :
+//                                                     codeStream.lcmp();
+//                                                     codeStream.ifle(trueLabel);
+//                                                     break;
+//                                             case T_double :
+//                                                     codeStream.dcmpg();
+//                                                     codeStream.ifle(trueLabel);
+//                                     }
+//                                     // reposition the endPC
+//                                     codeStream.updateLastRecordedEndPC(codeStream.position);                                        
+//                                     return;
+//                             }
+//                     } else {
+//                             if (trueLabel == null) {
+//                                     // implicit falling through the TRUE case
+//                                     switch (promotedTypeID) {
+//                                             case T_int :
+//                                                     codeStream.if_icmpgt(falseLabel);
+//                                                     break;
+//                                             case T_float :
+//                                                     codeStream.fcmpg();
+//                                                     codeStream.ifgt(falseLabel);
+//                                                     break;
+//                                             case T_long :
+//                                                     codeStream.lcmp();
+//                                                     codeStream.ifgt(falseLabel);
+//                                                     break;
+//                                             case T_double :
+//                                                     codeStream.dcmpg();
+//                                                     codeStream.ifgt(falseLabel);
+//                                     }
+//                                     // reposition the endPC
+//                                     codeStream.updateLastRecordedEndPC(codeStream.position);                                        
+//                                     return;
+//                             } else {
+//                                     // no implicit fall through TRUE/FALSE --> should never occur
+//                             }
+//                     }
+//             }
+//     }
+//     
+//     /**
+//      * Boolean generation for &
+//      */
+//     public void generateOptimizedLogicalAnd(
+//             BlockScope currentScope,
+//             CodeStream codeStream,
+//             Label trueLabel,
+//             Label falseLabel,
+//             boolean valueRequired) {
+//                     
+//             Constant condConst;
+//             if ((left.implicitConversion & 0xF) == T_boolean) {
+//                     if ((condConst = left.optimizedBooleanConstant()) != NotAConstant) {
+//                             if (condConst.booleanValue() == true) {
+//                                     // <something equivalent to true> & x
+//                                     left.generateOptimizedBoolean(
+//                                             currentScope,
+//                                             codeStream,
+//                                             trueLabel,
+//                                             falseLabel,
+//                                             false);
+//                                     if ((bits & OnlyValueRequiredMASK) != 0) {
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                     } else {
+//                                             right.generateOptimizedBoolean(
+//                                                     currentScope,
+//                                                     codeStream,
+//                                                     trueLabel,
+//                                                     falseLabel,
+//                                                     valueRequired);
+//                                     }
+//                             } else {
+//                                     // <something equivalent to false> & x
+//                                     left.generateOptimizedBoolean(
+//                                             currentScope,
+//                                             codeStream,
+//                                             trueLabel,
+//                                             falseLabel,
+//                                             false);
+//                                     right.generateOptimizedBoolean(
+//                                             currentScope,
+//                                             codeStream,
+//                                             trueLabel,
+//                                             falseLabel,
+//                                             false);
+//                                     if (valueRequired) {
+//                                             if ((bits & OnlyValueRequiredMASK) != 0) {
+//                                                     codeStream.iconst_0();
+//                                             } else {
+//                                                     if (falseLabel != null) {
+//                                                             // implicit falling through the TRUE case
+//                                                             codeStream.goto_(falseLabel);
+//                                                     }
+//                                             }
+//                                     }
+//                                     // reposition the endPC
+//                                     codeStream.updateLastRecordedEndPC(codeStream.position);                                        
+//                             }
+//                             return;
+//                     }
+//                     if ((condConst = right.optimizedBooleanConstant()) != NotAConstant) {
+//                             if (condConst.booleanValue() == true) {
+//                                     // x & <something equivalent to true>
+//                                     if ((bits & OnlyValueRequiredMASK) != 0) {
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                     } else {
+//                                             left.generateOptimizedBoolean(
+//                                                     currentScope,
+//                                                     codeStream,
+//                                                     trueLabel,
+//                                                     falseLabel,
+//                                                     valueRequired);
+//                                     }
+//                                     right.generateOptimizedBoolean(
+//                                             currentScope,
+//                                             codeStream,
+//                                             trueLabel,
+//                                             falseLabel,
+//                                             false);
+//                             } else {
+//                                     // x & <something equivalent to false>
+//                                     left.generateOptimizedBoolean(
+//                                             currentScope,
+//                                             codeStream,
+//                                             trueLabel,
+//                                             falseLabel,
+//                                             false);
+//                                     right.generateOptimizedBoolean(
+//                                             currentScope,
+//                                             codeStream,
+//                                             trueLabel,
+//                                             falseLabel,
+//                                             false);
+//                                     if (valueRequired) {
+//                                             if ((bits & OnlyValueRequiredMASK) != 0) {
+//                                                     codeStream.iconst_0();
+//                                             } else {
+//                                                     if (falseLabel != null) {
+//                                                             // implicit falling through the TRUE case
+//                                                             codeStream.goto_(falseLabel);
+//                                                     }
+//                                             }
+//                                     }
+//                                     // reposition the endPC
+//                                     codeStream.updateLastRecordedEndPC(codeStream.position);                                        
+//                             }
+//                             return;
+//                     }
+//             }
+//             // default case
+//             left.generateCode(currentScope, codeStream, valueRequired);
+//             right.generateCode(currentScope, codeStream, valueRequired);
+//             if (valueRequired) {
+//                     codeStream.iand();
+//                     if ((bits & OnlyValueRequiredMASK) == 0) {
+//                             if (falseLabel == null) {
+//                                     if (trueLabel != null) {
+//                                             // implicit falling through the FALSE case
+//                                             codeStream.ifne(trueLabel);
+//                                     }
+//                             } else {
+//                                     // implicit falling through the TRUE case
+//                                     if (trueLabel == null) {
+//                                             codeStream.ifeq(falseLabel);
+//                                     } else {
+//                                             // no implicit fall through TRUE/FALSE --> should never occur
+//                                     }
+//                             }
+//                     }
+//             }
+//             // reposition the endPC
+//             codeStream.updateLastRecordedEndPC(codeStream.position);                                        
+//     }
+//     
+//     /**
+//      * Boolean generation for |
+//      */
+//     public void generateOptimizedLogicalOr(
+//             BlockScope currentScope,
+//             CodeStream codeStream,
+//             Label trueLabel,
+//             Label falseLabel,
+//             boolean valueRequired) {
+//                     
+//             Constant condConst;
+//             if ((left.implicitConversion & 0xF) == T_boolean) {
+//                     if ((condConst = left.optimizedBooleanConstant()) != NotAConstant) {
+//                             if (condConst.booleanValue() == true) {
+//                                     // <something equivalent to true> | x
+//                                     left.generateOptimizedBoolean(
+//                                             currentScope,
+//                                             codeStream,
+//                                             trueLabel,
+//                                             falseLabel,
+//                                             false);
+//                                     right.generateOptimizedBoolean(
+//                                             currentScope,
+//                                             codeStream,
+//                                             trueLabel,
+//                                             falseLabel,
+//                                             false);
+//                                     if (valueRequired) {
+//                                             if ((bits & OnlyValueRequiredMASK) != 0) {
+//                                                     codeStream.iconst_1();
+//                                             } else {
+//                                                     if (trueLabel != null) {
+//                                                             codeStream.goto_(trueLabel);
+//                                                     }
+//                                             }
+//                                     }
+//                                     // reposition the endPC
+//                                     codeStream.updateLastRecordedEndPC(codeStream.position);                                        
+//                             } else {
+//                                     // <something equivalent to false> | x
+//                                     left.generateOptimizedBoolean(
+//                                             currentScope,
+//                                             codeStream,
+//                                             trueLabel,
+//                                             falseLabel,
+//                                             false);
+//                                     if ((bits & OnlyValueRequiredMASK) != 0) {
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                     } else {
+//                                             right.generateOptimizedBoolean(
+//                                                     currentScope,
+//                                                     codeStream,
+//                                                     trueLabel,
+//                                                     falseLabel,
+//                                                     valueRequired);
+//                                     }
+//                             }
+//                             return;
+//                     }
+//                     if ((condConst = right.optimizedBooleanConstant()) != NotAConstant) {
+//                             if (condConst.booleanValue() == true) {
+//                                     // x | <something equivalent to true>
+//                                     left.generateOptimizedBoolean(
+//                                             currentScope,
+//                                             codeStream,
+//                                             trueLabel,
+//                                             falseLabel,
+//                                             false);
+//                                     right.generateOptimizedBoolean(
+//                                             currentScope,
+//                                             codeStream,
+//                                             trueLabel,
+//                                             falseLabel,
+//                                             false);
+//                                     if (valueRequired) {
+//                                             if ((bits & OnlyValueRequiredMASK) != 0) {
+//                                                     codeStream.iconst_1();
+//                                             } else {
+//                                                     if (trueLabel != null) {
+//                                                             codeStream.goto_(trueLabel);
+//                                                     }
+//                                             }
+//                                     }
+//                                     // reposition the endPC
+//                                     codeStream.updateLastRecordedEndPC(codeStream.position);                                        
+//                             } else {
+//                                     // x | <something equivalent to false>
+//                                     if ((bits & OnlyValueRequiredMASK) != 0) {
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                     } else {
+//                                             left.generateOptimizedBoolean(
+//                                                     currentScope,
+//                                                     codeStream,
+//                                                     trueLabel,
+//                                                     falseLabel,
+//                                                     valueRequired);
+//                                     }
+//                                     right.generateOptimizedBoolean(
+//                                             currentScope,
+//                                             codeStream,
+//                                             trueLabel,
+//                                             falseLabel,
+//                                             false);
+//                             }
+//                             return;
+//                     }
+//             }
+//             // default case
+//             left.generateCode(currentScope, codeStream, valueRequired);
+//             right.generateCode(currentScope, codeStream, valueRequired);
+//             if (valueRequired) {
+//                     codeStream.ior();
+//                     if ((bits & OnlyValueRequiredMASK) == 0) {
+//                             if (falseLabel == null) {
+//                                     if (trueLabel != null) {
+//                                             // implicit falling through the FALSE case
+//                                             codeStream.ifne(trueLabel);
+//                                     }
+//                             } else {
+//                                     // implicit falling through the TRUE case
+//                                     if (trueLabel == null) {
+//                                             codeStream.ifeq(falseLabel);
+//                                     } else {
+//                                             // no implicit fall through TRUE/FALSE --> should never occur
+//                                     }
+//                             }
+//                     }
+//             }
+//             // reposition the endPC
+//             codeStream.updateLastRecordedEndPC(codeStream.position);                                        
+//     }
+//     
+//     /**
+//      * Boolean generation for ^
+//      */
+//     public void generateOptimizedLogicalXor(
+//             BlockScope currentScope,
+//             CodeStream codeStream,
+//             Label trueLabel,
+//             Label falseLabel,
+//             boolean valueRequired) {
+//                     
+//             Constant condConst;
+//             if ((left.implicitConversion & 0xF) == T_boolean) {
+//                     if ((condConst = left.optimizedBooleanConstant()) != NotAConstant) {
+//                             if (condConst.booleanValue() == true) {
+//                                     // <something equivalent to true> ^ x
+//                                     left.generateOptimizedBoolean(
+//                                             currentScope,
+//                                             codeStream,
+//                                             trueLabel,
+//                                             falseLabel,
+//                                             false);
+//                                     right.generateOptimizedBoolean(
+//                                             currentScope,
+//                                             codeStream,
+//                                             falseLabel,
+//                                             trueLabel,
+//                                             valueRequired);
+//                             } else {
+//                                     // <something equivalent to false> ^ x
+//                                     left.generateOptimizedBoolean(
+//                                             currentScope,
+//                                             codeStream,
+//                                             trueLabel,
+//                                             falseLabel,
+//                                             false);
+//                                     if ((bits & OnlyValueRequiredMASK) != 0) {
+//                                             right.generateCode(currentScope, codeStream, valueRequired);
+//                                     } else {
+//                                             right.generateOptimizedBoolean(
+//                                                     currentScope,
+//                                                     codeStream,
+//                                                     trueLabel,
+//                                                     falseLabel,
+//                                                     valueRequired);
+//                                     }
+//                             }
+//                             return;
+//                     }
+//                     if ((condConst = right.optimizedBooleanConstant()) != NotAConstant) {
+//                             if (condConst.booleanValue() == true) {
+//                                     // x ^ <something equivalent to true>
+//                                     left.generateOptimizedBoolean(
+//                                             currentScope,
+//                                             codeStream,
+//                                             falseLabel,
+//                                             trueLabel,
+//                                             valueRequired);
+//                                     right.generateOptimizedBoolean(
+//                                             currentScope,
+//                                             codeStream,
+//                                             trueLabel,
+//                                             falseLabel,
+//                                             false);
+//                             } else {
+//                                     // x ^ <something equivalent to false>
+//                                     if ((bits & OnlyValueRequiredMASK) != 0) {
+//                                             left.generateCode(currentScope, codeStream, valueRequired);
+//                                     } else {
+//                                             left.generateOptimizedBoolean(
+//                                                     currentScope,
+//                                                     codeStream,
+//                                                     trueLabel,
+//                                                     falseLabel,
+//                                                     valueRequired);
+//                                     }
+//                                     right.generateOptimizedBoolean(
+//                                             currentScope,
+//                                             codeStream,
+//                                             trueLabel,
+//                                             falseLabel,
+//                                             false);
+//                             }
+//                             return;
+//                     }
+//             }
+//             // default case
+//             left.generateCode(currentScope, codeStream, valueRequired);
+//             right.generateCode(currentScope, codeStream, valueRequired);
+//             if (valueRequired) {
+//                     codeStream.ixor();
+//                     if ((bits & OnlyValueRequiredMASK) == 0) {
+//                             if (falseLabel == null) {
+//                                     if (trueLabel != null) {
+//                                             // implicit falling through the FALSE case
+//                                             codeStream.ifne(trueLabel);
+//                                     }
+//                             } else {
+//                                     // implicit falling through the TRUE case
+//                                     if (trueLabel == null) {
+//                                             codeStream.ifeq(falseLabel);
+//                                     } else {
+//                                             // no implicit fall through TRUE/FALSE --> should never occur
+//                                     }
+//                             }
+//                     }
+//             }
+//             // reposition the endPC
+//             codeStream.updateLastRecordedEndPC(codeStream.position);                                        
+//     }
+//     
+//     public void generateOptimizedStringBuffer(
+//             BlockScope blockScope,
+//             CodeStream codeStream,
+//             int typeID) {
+//                     
+//             /* In the case trying to make a string concatenation, there is no need to create a new
+//              * string buffer, thus use a lower-level API for code generation involving only the
+//              * appending of arguments to the existing StringBuffer
+//              */
+//
+//             if ((((bits & OperatorMASK) >> OperatorSHIFT) == PLUS)
+//                     && ((bits & ReturnTypeIDMASK) == T_String)) {
+//                     if (constant != NotAConstant) {
+//                             codeStream.generateConstant(constant, implicitConversion);
+//                             codeStream.invokeStringBufferAppendForType(implicitConversion & 0xF);
+//                     } else {
+//                             int pc = codeStream.position;
+//                             left.generateOptimizedStringBuffer(
+//                                     blockScope,
+//                                     codeStream,
+//                                     left.implicitConversion & 0xF);
+//                             codeStream.recordPositionsFrom(pc, left.sourceStart);
+//                             pc = codeStream.position;
+//                             right.generateOptimizedStringBuffer(
+//                                     blockScope,
+//                                     codeStream,
+//                                     right.implicitConversion & 0xF);
+//                             codeStream.recordPositionsFrom(pc, right.sourceStart);
+//                     }
+//             } else {
+//                     super.generateOptimizedStringBuffer(blockScope, codeStream, typeID);
+//             }
+//     }
+//     
+//     public void generateOptimizedStringBufferCreation(
+//             BlockScope blockScope,
+//             CodeStream codeStream,
+//             int typeID) {
+//                     
+//             /* In the case trying to make a string concatenation, there is no need to create a new
+//              * string buffer, thus use a lower-level API for code generation involving only the 
+//              * appending of arguments to the existing StringBuffer
+//              */
+//
+//             if ((((bits & OperatorMASK) >> OperatorSHIFT) == PLUS)
+//                     && ((bits & ReturnTypeIDMASK) == T_String)) {
+//                     if (constant != NotAConstant) {
+//                             codeStream.newStringBuffer(); // new: java.lang.StringBuffer
+//                             codeStream.dup();
+//                             codeStream.ldc(constant.stringValue());
+//                             codeStream.invokeStringBufferStringConstructor();
+//                             // invokespecial: java.lang.StringBuffer.<init>(Ljava.lang.String;)V
+//                     } else {
+//                             int pc = codeStream.position;
+//                             left.generateOptimizedStringBufferCreation(
+//                                     blockScope,
+//                                     codeStream,
+//                                     left.implicitConversion & 0xF);
+//                             codeStream.recordPositionsFrom(pc, left.sourceStart);
+//                             pc = codeStream.position;
+//                             right.generateOptimizedStringBuffer(
+//                                     blockScope,
+//                                     codeStream,
+//                                     right.implicitConversion & 0xF);
+//                             codeStream.recordPositionsFrom(pc, right.sourceStart);
+//                     }
+//             } else {
+//                     super.generateOptimizedStringBufferCreation(blockScope, codeStream, typeID);
+//             }
+//     }
+//     
+//     public boolean isCompactableOperation() {
+//             
+//             return true;
+//     }
+//     
+//     public void optimizedBooleanConstant(int leftId, int operator, int rightId) {
+//
+//             switch (operator) {
+//                     case AND :
+//                             if ((leftId != T_boolean) || (rightId != T_boolean))
+//                                     return;
+//                     case AND_AND :
+//                             Constant cst;
+//                             if ((cst = left.optimizedBooleanConstant()) != NotAConstant) {
+//                                     if (cst.booleanValue() == false) { // left is equivalent to false
+//                                             optimizedBooleanConstant = cst; // constant(false)
+//                                             return;
+//                                     } else { //left is equivalent to true
+//                                             if ((cst = right.optimizedBooleanConstant()) != NotAConstant) {
+//                                                     optimizedBooleanConstant = cst;
+//                                                     // the conditional result is equivalent to the right conditional value
+//                                             }
+//                                             return;
+//                                     }
+//                             }
+//                             if ((cst = right.optimizedBooleanConstant()) != NotAConstant) {
+//                                     if (cst.booleanValue() == false) { // right is equivalent to false
+//                                             optimizedBooleanConstant = cst; // constant(false)
+//                                     }
+//                             }
+//                             return;
+//                     case OR :
+//                             if ((leftId != T_boolean) || (rightId != T_boolean))
+//                                     return;
+//                     case OR_OR :
+//                             if ((cst = left.optimizedBooleanConstant()) != NotAConstant) {
+//                                     if (cst.booleanValue() == true) { // left is equivalent to true
+//                                             optimizedBooleanConstant = cst; // constant(true)
+//                                             return;
+//                                     } else { //left is equivalent to false
+//                                             if ((cst = right.optimizedBooleanConstant()) != NotAConstant) {
+//                                                     optimizedBooleanConstant = cst;
+//                                             }
+//                                             return;
+//                                     }
+//                             }
+//                             if ((cst = right.optimizedBooleanConstant()) != NotAConstant) {
+//                                     if (cst.booleanValue() == true) { // right is equivalent to true
+//                                             optimizedBooleanConstant = cst; // constant(true)
+//                                     }
+//                             }
+//             }
+//     } 
+       public StringBuffer printExpressionNoParenthesis(int indent, StringBuffer output) {
+
+               left.printExpression(indent, output).append(' ').append(operatorToString()).append(' ');
+               return right.printExpression(0, output);
+       }
+       public TypeBinding resolveType(BlockScope scope) {
+
+               // use the id of the type to navigate into the table
+               TypeBinding leftTb = left.resolveType(scope);
+               TypeBinding rightTb = right.resolveType(scope);
+               if (leftTb == null || rightTb == null) {
+                       constant = Constant.NotAConstant;
+                       return null;
+               }
+               int leftId = leftTb.id;
+               int rightId = rightTb.id;
+               if (leftId > 15
+                       || rightId > 15) { // must convert String + Object || Object + String
+                       if (leftId == T_String) {
+                               rightId = T_Object;
+                       } else if (rightId == T_String) {
+                               leftId = T_Object;
+                       } else {
+                               constant = Constant.NotAConstant;
+                               scope.problemReporter().invalidOperator(this, leftTb, rightTb);
+                               return null;
+                       }
+               }
+               if (((bits & OperatorMASK) >> OperatorSHIFT) == PLUS) {
+                       if (leftId == T_String
+                               && rightTb.isArrayType()
+                               && ((ArrayBinding) rightTb).elementsType(scope) == CharBinding)
+                               scope.problemReporter().signalNoImplicitStringConversionForCharArrayExpression(
+                                       right);
+                       else if (
+                               rightId == T_String
+                                       && leftTb.isArrayType()
+                                       && ((ArrayBinding) leftTb).elementsType(scope) == CharBinding)
+                               scope.problemReporter().signalNoImplicitStringConversionForCharArrayExpression(
+                                       left);
+               }
+
+               // the code is an int
+               // (cast)  left   Op (cast)  rigth --> result
+               //  0000   0000       0000   0000      0000
+               //  <<16   <<12       <<8    <<4       <<0
+
+               // Don't test for result = 0. If it is zero, some more work is done.
+               // On the one hand when it is not zero (correct code) we avoid doing the test   
+               int result =
+                       ResolveTypeTables[(bits & OperatorMASK) >> OperatorSHIFT][(leftId << 4)
+                               + rightId];
+               left.implicitConversion = result >>> 12;
+               right.implicitConversion = (result >>> 4) & 0x000FF;
+
+               bits |= result & 0xF;
+               switch (result & 0xF) { // record the current ReturnTypeID
+                       // only switch on possible result type.....
+                       case T_boolean :
+                               this.resolvedType = BooleanBinding;
+                               break;
+                       case T_byte :
+                               this.resolvedType = ByteBinding;
+                               break;
+                       case T_char :
+                               this.resolvedType = CharBinding;
+                               break;
+                       case T_double :
+                               this.resolvedType = DoubleBinding;
+                               break;
+                       case T_float :
+                               this.resolvedType = FloatBinding;
+                               break;
+                       case T_int :
+                               this.resolvedType = IntBinding;
+                               break;
+                       case T_long :
+                               this.resolvedType = LongBinding;
+                               break;
+                       case T_String :
+                               this.resolvedType = scope.getJavaLangString();
+                               break;
+                       default : //error........
+                               constant = Constant.NotAConstant;
+                               scope.problemReporter().invalidOperator(this, leftTb, rightTb);
+                               return null;
+               }
+
+               // compute the constant when valid
+               computeConstant(scope, leftId, rightId);
+               return this.resolvedType;
+       }
+       
+       public String toStringExpressionNoParenthesis() {
+
+               return left.toStringExpression() + " " + //$NON-NLS-1$
+               operatorToString() + " " + //$NON-NLS-1$
+               right.toStringExpression();
+       }
+
+       public void traverse(ASTVisitor visitor, BlockScope scope) {
+               
+               if (visitor.visit(this, scope)) {
+                       left.traverse(visitor, scope);
+                       right.traverse(visitor, scope);
+               }
+               visitor.endVisit(this, scope);
+       }
 }