/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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.
 *
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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.
/** * 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
/** * Constructor */
public BooleanExpression(long where, boolean value) { super(BOOLEANVAL, where, Type.tBoolean); this.value = value; }
Get the value
/** * Get the value */
public Object getValue() { return value ? 1 : 0; }
Check if the expression is equal to a value
/** * 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
/** * 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<Object, Object> exp, ConditionVars cvars) { if (value) { cvars.vsFalse = Vset.DEAD_END; cvars.vsTrue = vset; } else { cvars.vsFalse = vset; cvars.vsTrue = Vset.DEAD_END; } }
Code
/** * 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, value ? 1 : 0); }
Print
/** * Print */
public void print(PrintStream out) { out.print(value ? "true" : "false"); } }