java.nio.Direct-X-Buffer.template Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of qbicc-rt-java.base Show documentation
Show all versions of qbicc-rt-java.base Show documentation
The Qbicc builder for the java.base JDK module
/*
* Copyright (c) 2000, 2021, 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.
*/
#warn This file is preprocessed before being compiled
package java.nio;
import java.io.FileDescriptor;
import java.lang.ref.Reference;
import java.util.Objects;
import jdk.internal.access.foreign.MemorySegmentProxy;
import jdk.internal.misc.ScopedMemoryAccess.Scope;
import jdk.internal.misc.VM;
import jdk.internal.ref.Cleaner;
import sun.nio.ch.DirectBuffer;
class Direct$Type$Buffer$RW$$BO$
#if[rw]
extends {#if[byte]?Mapped$Type$Buffer:$Type$Buffer}
#else[rw]
extends Direct$Type$Buffer$BO$
#end[rw]
implements DirectBuffer
{
#if[rw]
// Cached array base offset
private static final long ARRAY_BASE_OFFSET = UNSAFE.arrayBaseOffset($type$[].class);
// Cached unaligned-access capability
protected static final boolean UNALIGNED = Bits.unaligned();
// Base address, used in all indexing calculations
// NOTE: moved up to Buffer.java for speed in JNI GetDirectBufferAddress
// protected long address;
// An object attached to this buffer. If this buffer is a view of another
// buffer then we use this field to keep a reference to that buffer to
// ensure that its memory isn't freed before we are done with it.
private final Object att;
public Object attachment() {
return att;
}
#if[byte]
private static class Deallocator
implements Runnable
{
private long address;
private long size;
private int capacity;
private Deallocator(long address, long size, int capacity) {
assert (address != 0);
this.address = address;
this.size = size;
this.capacity = capacity;
}
public void run() {
if (address == 0) {
// Paranoia
return;
}
UNSAFE.freeMemory(address);
address = 0;
Bits.unreserveMemory(size, capacity);
}
}
private final Cleaner cleaner;
public Cleaner cleaner() { return cleaner; }
#else[byte]
public Cleaner cleaner() { return null; }
#end[byte]
#end[rw]
#if[byte]
// Primary constructor
//
Direct$Type$Buffer$RW$(int cap) { // package-private
#if[rw]
super(-1, 0, cap, cap, null);
boolean pa = VM.isDirectMemoryPageAligned();
int ps = Bits.pageSize();
long size = Math.max(1L, (long)cap + (pa ? ps : 0));
Bits.reserveMemory(size, cap);
long base = 0;
try {
base = UNSAFE.allocateMemory(size);
} catch (OutOfMemoryError x) {
Bits.unreserveMemory(size, cap);
throw x;
}
UNSAFE.setMemory(base, size, (byte) 0);
if (pa && (base % ps != 0)) {
// Round up to page boundary
address = base + ps - (base & (ps - 1));
} else {
address = base;
}
cleaner = Cleaner.create(this, new Deallocator(base, size, cap));
att = null;
#else[rw]
super(cap);
this.isReadOnly = true;
#end[rw]
}
#if[rw]
// Invoked to construct a direct ByteBuffer referring to the block of
// memory. A given arbitrary object may also be attached to the buffer.
//
Direct$Type$Buffer(long addr, int cap, Object ob, MemorySegmentProxy segment) {
super(-1, 0, cap, cap, segment);
address = addr;
cleaner = null;
att = ob;
}
// Invoked to construct a direct ByteBuffer referring to the block of
// memory. A given arbitrary object may also be attached to the buffer.
//
Direct$Type$Buffer(long addr, int cap, Object ob, FileDescriptor fd, boolean isSync, MemorySegmentProxy segment) {
super(-1, 0, cap, cap, fd, isSync, segment);
address = addr;
cleaner = null;
att = ob;
}
// Invoked only by JNI: NewDirectByteBuffer(void*, long)
//
private Direct$Type$Buffer(long addr, int cap) {
super(-1, 0, cap, cap, null);
address = addr;
cleaner = null;
att = null;
}
#end[rw]
// For memory-mapped buffers -- invoked by FileChannelImpl via reflection
//
protected Direct$Type$Buffer$RW$(int cap, long addr,
FileDescriptor fd,
Runnable unmapper,
boolean isSync, MemorySegmentProxy segment)
{
#if[rw]
super(-1, 0, cap, cap, fd, isSync, segment);
address = addr;
cleaner = Cleaner.create(this, unmapper);
att = null;
#else[rw]
super(cap, addr, fd, unmapper, isSync, segment);
this.isReadOnly = true;
#end[rw]
}
#end[byte]
// For duplicates and slices
//
Direct$Type$Buffer$RW$$BO$(DirectBuffer db, // package-private
int mark, int pos, int lim, int cap, int off,
#if[byte]
FileDescriptor fd, boolean isSync,
#end[byte]
MemorySegmentProxy segment)
{
#if[rw]
super(mark, pos, lim, cap,
#if[byte]
fd, isSync,
#end[byte]
segment);
address = ((Buffer)db).address + off;
#if[byte]
cleaner = null;
#end[byte]
Object attachment = db.attachment();
att = (attachment == null ? db : attachment);
#else[rw]
super(db, mark, pos, lim, cap, off,
#if[byte]
fd, isSync,
#end[byte]
segment);
this.isReadOnly = true;
#end[rw]
}
@Override
Object base() {
return null;
}
public {#if[byte]?Mapped$Type$Buffer:$Type$Buffer} slice() {
int pos = this.position();
int lim = this.limit();
int rem = (pos <= lim ? lim - pos : 0);
int off = (pos << $LG_BYTES_PER_VALUE$);
assert (off >= 0);
return new Direct$Type$Buffer$RW$$BO$(this,
-1,
0,
rem,
rem,
off,
#if[byte]
fileDescriptor(),
isSync(),
#end[byte]
segment);
}
@Override
public {#if[byte]?Mapped$Type$Buffer:$Type$Buffer} slice(int index, int length) {
Objects.checkFromIndexSize(index, length, limit());
return new Direct$Type$Buffer$RW$$BO$(this,
-1,
0,
length,
length,
index << $LG_BYTES_PER_VALUE$,
#if[byte]
fileDescriptor(),
isSync(),
#end[byte]
segment);
}
public {#if[byte]?Mapped$Type$Buffer:$Type$Buffer} duplicate() {
return new Direct$Type$Buffer$RW$$BO$(this,
this.markValue(),
this.position(),
this.limit(),
this.capacity(),
0,
#if[byte]
fileDescriptor(),
isSync(),
#end[byte]
segment);
}
public $Type$Buffer asReadOnlyBuffer() {
#if[rw]
return new Direct$Type$BufferR$BO$(this,
this.markValue(),
this.position(),
this.limit(),
this.capacity(),
0,
#if[byte]
fileDescriptor(),
isSync(),
#end[byte]
segment);
#else[rw]
return duplicate();
#end[rw]
}
#if[rw]
public long address() {
Scope scope = scope();
if (scope != null) {
if (scope.ownerThread() == null) {
throw new UnsupportedOperationException("ByteBuffer derived from shared segments not supported");
}
try {
scope.checkValidState();
} catch (Scope.ScopedAccessError e) {
throw new IllegalStateException("This segment is already closed");
}
}
return address;
}
private long ix(int i) {
return address + ((long)i << $LG_BYTES_PER_VALUE$);
}
public $type$ get() {
try {
return $fromBits$($swap$(SCOPED_MEMORY_ACCESS.get$Swaptype$(scope(), null, ix(nextGetIndex()))));
} finally {
Reference.reachabilityFence(this);
}
}
public $type$ get(int i) {
try {
return $fromBits$($swap$(SCOPED_MEMORY_ACCESS.get$Swaptype$(scope(), null, ix(checkIndex(i)))));
} finally {
Reference.reachabilityFence(this);
}
}
#if[streamableType]
$type$ getUnchecked(int i) {
try {
return $fromBits$($swap$(SCOPED_MEMORY_ACCESS.get$Swaptype$(null, null, ix(i))));
} finally {
Reference.reachabilityFence(this);
}
}
#end[streamableType]
#end[rw]
public $Type$Buffer put($type$ x) {
#if[rw]
try {
SCOPED_MEMORY_ACCESS.put$Swaptype$(scope(), null, ix(nextPutIndex()), $swap$($toBits$(x)));
} finally {
Reference.reachabilityFence(this);
}
return this;
#else[rw]
throw new ReadOnlyBufferException();
#end[rw]
}
public $Type$Buffer put(int i, $type$ x) {
#if[rw]
try {
SCOPED_MEMORY_ACCESS.put$Swaptype$(scope(), null, ix(checkIndex(i)), $swap$($toBits$(x)));
} finally {
Reference.reachabilityFence(this);
}
return this;
#else[rw]
throw new ReadOnlyBufferException();
#end[rw]
}
public {#if[byte]?Mapped$Type$Buffer:$Type$Buffer} compact() {
#if[rw]
int pos = position();
int lim = limit();
assert (pos <= lim);
int rem = (pos <= lim ? lim - pos : 0);
try {
// null is passed as destination Scope to avoid checking scope() twice
SCOPED_MEMORY_ACCESS.copyMemory(scope(), null, null,
ix(pos), null, ix(0), (long)rem << $LG_BYTES_PER_VALUE$);
} finally {
Reference.reachabilityFence(this);
}
position(rem);
limit(capacity());
discardMark();
return this;
#else[rw]
throw new ReadOnlyBufferException();
#end[rw]
}
public boolean isDirect() {
return true;
}
public boolean isReadOnly() {
return {#if[rw]?false:true};
}
#if[char]
public String toString(int start, int end) {
Objects.checkFromToIndex(start, end, limit());
try {
int len = end - start;
char[] ca = new char[len];
CharBuffer cb = CharBuffer.wrap(ca);
CharBuffer db = this.duplicate();
db.position(start);
db.limit(end);
cb.put(db);
return new String(ca);
} catch (StringIndexOutOfBoundsException x) {
throw new IndexOutOfBoundsException();
}
}
// --- Methods to support CharSequence ---
public CharBuffer subSequence(int start, int end) {
int pos = position();
int lim = limit();
assert (pos <= lim);
pos = (pos <= lim ? pos : lim);
int len = lim - pos;
Objects.checkFromToIndex(start, end, len);
return new DirectCharBuffer$RW$$BO$(this,
-1,
pos + start,
pos + end,
capacity(),
offset, segment);
}
#end[char]
#if[!byte]
public ByteOrder order() {
#if[boS]
return ((ByteOrder.nativeOrder() == ByteOrder.BIG_ENDIAN)
? ByteOrder.LITTLE_ENDIAN : ByteOrder.BIG_ENDIAN);
#end[boS]
#if[boU]
return ((ByteOrder.nativeOrder() != ByteOrder.BIG_ENDIAN)
? ByteOrder.LITTLE_ENDIAN : ByteOrder.BIG_ENDIAN);
#end[boU]
}
#end[!byte]
#if[char]
ByteOrder charRegionOrder() {
return order();
}
#end[char]
#if[byte]
// #BIN
//
// Binary-data access methods for short, char, int, long, float,
// and double will be inserted here
#end[byte]
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy