--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/sun/tools/tree/BooleanExpression.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,118 @@
+/*
+ * Copyright 1994-2003 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+package sun.tools.tree;
+
+import sun.tools.java.*;
+import sun.tools.asm.Assembler;
+import sun.tools.asm.Label;
+import java.io.PrintStream;
+import java.util.Hashtable;
+
+/**
+ * WARNING: The contents of this source file are not part of any
+ * supported API.  Code that depends on them does so at its own risk:
+ * they are subject to change or removal without notice.
+ */
+public
+class BooleanExpression extends ConstantExpression {
+    boolean value;
+
+    /**
+     * Constructor
+     */
+    public BooleanExpression(long where, boolean value) {
+        super(BOOLEANVAL, where, Type.tBoolean);
+        this.value = value;
+    }
+
+    /**
+     * Get the value
+     */
+    public Object getValue() {
+        return new Integer(value ? 1 : 0);
+    }
+
+    /**
+     * Check if the expression is equal to a value
+     */
+    public boolean equals(boolean b) {
+        return value == b;
+    }
+
+
+    /**
+     * Check if the expression is equal to its default static value
+     */
+    public boolean equalsDefault() {
+        return !value;
+    }
+
+
+    /*
+     * Check a "not" expression.
+     *
+     * cvars is modified so that
+     *    cvar.vsTrue indicates variables with a known value if
+     *         the expression is true.
+     *    cvars.vsFalse indicates variables with a known value if
+     *         the expression is false
+     *
+     * For constant expressions, set the side that corresponds to our
+     * already known value to vset.  Set the side that corresponds to the
+     * other way to "impossible"
+     */
+
+    public void checkCondition(Environment env, Context ctx,
+                               Vset vset, Hashtable exp, ConditionVars cvars) {
+        if (value) {
+            cvars.vsFalse = Vset.DEAD_END;
+            cvars.vsTrue = vset;
+        } else {
+            cvars.vsFalse = vset;
+            cvars.vsTrue = Vset.DEAD_END;
+        }
+    }
+
+
+    /**
+     * Code
+     */
+    void codeBranch(Environment env, Context ctx, Assembler asm, Label lbl, boolean whenTrue) {
+        if (value == whenTrue) {
+            asm.add(where, opc_goto, lbl);
+        }
+    }
+    public void codeValue(Environment env, Context ctx, Assembler asm) {
+        asm.add(where, opc_ldc, new Integer(value ? 1 : 0));
+    }
+
+    /**
+     * Print
+     */
+    public void print(PrintStream out) {
+        out.print(value ? "true" : "false");
+    }
+}