/*
 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */
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);
 }
 }
}