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/*
* Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use
* in the design, construction, operation or maintenance of any nuclear
* facility.
*/
package com.sun.gluegen.runtime;
import java.nio.*;
public class PointerBuffer {
private ByteBuffer bb;
private LongBuffer lb;
private int capacity, position;
private long[] backup;
private PointerBuffer(ByteBuffer bb) {
this.bb = bb;
this.lb = bb.asLongBuffer();
capacity = bb.capacity()/BufferFactory.SIZEOF_LONG;
position=0;
backup = new long[capacity];
}
public final int limit() {
return capacity;
}
public final int capacity() {
return capacity;
}
public final int position() {
return position;
}
public final PointerBuffer position(int newPos) {
if(0>newPos || newPos>=capacity) {
throw new IndexOutOfBoundsException();
}
position = newPos;
return this;
}
public final int remaining() {
return capacity - position;
}
public final boolean hasRemaining() {
return position < capacity;
}
public final PointerBuffer rewind() {
position=0;
return this;
}
int arrayOffset() { return 0; }
boolean hasArray() { return true; }
public long[] array() {
return backup;
}
public static PointerBuffer allocate(int size) {
return new PointerBuffer(ByteBuffer.wrap(new byte[BufferFactory.SIZEOF_LONG * size]));
}
public static PointerBuffer allocateDirect(int size) {
return new PointerBuffer(BufferFactory.newDirectByteBuffer(BufferFactory.SIZEOF_LONG * size));
}
public static PointerBuffer wrap(ByteBuffer src) {
PointerBuffer res = new PointerBuffer(src);
res.updateBackup();
return res;
}
/**
* Wraps pointer arrays created by native code.
* Note: In case this is not a 64bit system, each pointer is being converted. */
public static PointerBuffer wrapNative2Java(ByteBuffer src, boolean keepDirect) {
PointerBuffer res;
if (CPU.is32Bit()) {
// Must convert each pointer from 32-bit to 64-bit
IntBuffer buf = src.asIntBuffer();
int len = buf.capacity();
res = (src.isDirect() && keepDirect) ? PointerBuffer.allocateDirect(len) : PointerBuffer.allocate(len);
for (int i = 0; i < len; i++) {
res.put(i, buf.get(i));
}
} else {
res = new PointerBuffer(src);
res.updateBackup();
}
return res;
}
public ByteBuffer getBuffer() {
return bb;
}
public boolean isDirect() {
return bb.isDirect();
}
public long get(int idx) {
if(0>idx || idx>=capacity) {
throw new IndexOutOfBoundsException();
}
return lb.get(idx);
}
public long get() {
long r = get(position);
position++;
return r;
}
public PointerBuffer put(int idx, long v) {
if(0>idx || idx>=capacity) {
throw new IndexOutOfBoundsException();
}
backup[idx] = v;
lb.put(idx, v);
return this;
}
public PointerBuffer put(long v) {
put(position, v);
position++;
return this;
}
private void updateBackup() {
for (int i = 0; i < capacity; i++) {
backup[i] = get(i);
}
}
}
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