/*
* Copyright (c) 2001, 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.
*
* 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.jvm.hotspot.interpreter;
import sun.jvm.hotspot.oops.*;
import sun.jvm.hotspot.utilities.*;
public class BytecodeTableswitch extends Bytecode {
BytecodeTableswitch(Method method, int bci) {
super(method, bci);
}
// Attributes
public int defaultOffset() { return javaSignedWordAt(alignedOffset(1 + 0*jintSize)); }
public int lowKey() { return javaSignedWordAt(alignedOffset(1 + 1*jintSize)); }
public int highKey() { return javaSignedWordAt(alignedOffset(1 + 2*jintSize)); }
public int length() { return highKey()-lowKey()+1; }
public int destOffsetAt(int i) {
int x2 = alignedOffset(1 + (3 + i)*jintSize);
int val = javaSignedWordAt(x2);
return javaSignedWordAt(alignedOffset(1 + (3 + i)*jintSize));
}
public void verify() {
if (Assert.ASSERTS_ENABLED) {
Assert.that(isValid(), "check tableswitch");
}
}
public boolean isValid() {
boolean result = javaCode() == Bytecodes._tableswitch;
if (result == false) return false;
int lo = lowKey();
int hi = highKey();
if (hi < lo) // incorrect hi/lo values in tableswitch
return false;
int i = hi - lo - 1 ;
while (i-- > 0) {
// no special check needed
}
return true;
}
public static BytecodeTableswitch at(Method method, int bci) {
BytecodeTableswitch b = new BytecodeTableswitch(method, bci);
if (Assert.ASSERTS_ENABLED) {
b.verify();
}
return b;
}
/** Like at, but returns null if the BCI is not at tableswitch */
public static BytecodeTableswitch atCheck(Method method, int bci) {
BytecodeTableswitch b = new BytecodeTableswitch(method, bci);
return (b.isValid() ? b : null);
}
public static BytecodeTableswitch at(BytecodeStream bcs) {
return new BytecodeTableswitch(bcs.method(), bcs.bci());
}
public String toString() {
StringBuffer buf = new StringBuffer();
buf.append("tableswitch");
buf.append(spaces);
buf.append("default: ");
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