| /* |
| * Copyright (c) 1994, 2003, Oracle and/or its affiliates. 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.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"); |
| } |
| } |