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	/*
	* Copyright (c) 2015, 2017, 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 java.lang;

	final class LiveStackFrameInfo extends StackFrameInfo implements LiveStackFrame {
	private static Object[] EMPTY_ARRAY = new Object[0];

	// These flags must match the values maintained in the VM
	private static final int MODE_INTERPRETED = 0x01;
	private static final int MODE_COMPILED = 0x02;

	LiveStackFrameInfo(StackWalker walker) {
	super(walker);
	}

	// These fields are initialized by the VM if ExtendedOption.LOCALS_AND_OPERANDS is set
	private Object[] monitors = EMPTY_ARRAY;
	private Object[] locals = EMPTY_ARRAY;
	private Object[] operands = EMPTY_ARRAY;
	private int mode = 0;

	@Override
	public Object[] getMonitors() {
	return monitors;
	}

	@Override
	public Object[] getLocals() {
	return locals;
	}

	@Override
	public Object[] getStack() {
	return operands;
	}

	@Override
	public String toString() {
	StringBuilder retVal = new StringBuilder(super.toString());
	if (mode != 0) {
	retVal.append("(");
	if ((mode & MODE_INTERPRETED) == MODE_INTERPRETED) {
	retVal.append(" interpreted ");
	}
	if ((mode & MODE_COMPILED) == MODE_COMPILED) {
	retVal.append(" compiled ");
	}
	retVal.append(")");
	}
	return retVal.toString();
	}

	/*
	* Convert primitive value to {@code PrimitiveSlot} object to represent
	* a local variable or an element on the operand stack of primitive type.
	*/

	static PrimitiveSlot asPrimitive(int value) {
	return new PrimitiveSlot32(value);
	}

	static PrimitiveSlot asPrimitive(long value) {
	return new PrimitiveSlot64(value);
	}

	private static class PrimitiveSlot32 extends PrimitiveSlot {
	final int value;
	PrimitiveSlot32(int value) {
	this.value = value;
	}

	@Override
	public int size() {
	return 4;
	}

	@Override
	public int intValue() {
	return value;
	}

	@Override
	public String toString() {
	return String.valueOf(value);
	}
	}

	private static class PrimitiveSlot64 extends PrimitiveSlot {
	final long value;
	PrimitiveSlot64(long value) {
	this.value = value;
	}

	@Override
	public int size() {
	return 8;
	}

	@Override
	public long longValue() {
	return value;
	}

	@Override
	public String toString() {
	return String.valueOf(value);
	}
	}
	}

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