src/java.base/share/classes/java/nio/Heap-X-Buffer.java.template - master - githubmirror/riscv-port

src/java.base/share/classes/java/nio/Heap-X-Buffer.java.template
762 строки24 KB
Brian Burkhalter
8357286: (bf) Remove obsolete instanceof checks in CharBuffer.append
12 июн 2025, 23:21
12 июн 2025, 23:210dd7c69
/*
 * Copyright (c) 2000, 2025, 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.lang.foreign.MemorySegment;
import jdk.internal.foreign.AbstractMemorySegmentImpl;
import jdk.internal.foreign.MemorySessionImpl;
import jdk.internal.foreign.SegmentFactories;
import jdk.internal.vm.annotation.ForceInline;
import java.util.Objects;

/**
#if[rw]
 * A read/write Heap$Type$Buffer.
#else[rw]
 * A read-only Heap$Type$Buffer.  This class extends the corresponding
 * read/write class, overriding the mutation methods to throw a {@link
 * ReadOnlyBufferException} and overriding the view-buffer methods to return an
 * instance of this class rather than of the superclass.
#end[rw]
 */
#if[rw]
sealed
#else[rw]
final
#end[rw]
class Heap$Type$Buffer$RW$
    extends {#if[ro]?Heap}$Type$Buffer
#if[rw]
    permits Heap$Type$BufferR
#end[rw]
{
#if[rw]
    // Cached array base offset
    private static final long ARRAY_BASE_OFFSET = UNSAFE.arrayBaseOffset($type$[].class);

    // Cached array index scale
    private static final long ARRAY_INDEX_SCALE = UNSAFE.arrayIndexScale($type$[].class);

    // For speed these fields are actually declared in X-Buffer;
    // these declarations are here as documentation
    /*
    protected final $type$[] hb;
    protected final int offset;
    */
#end[rw]

    Heap$Type$Buffer$RW$(int cap, int lim, MemorySegment segment) {            // package-private
#if[rw]
        super(-1, 0, lim, cap, new $type$[cap], 0, segment);
        /*
        hb = new $type$[cap];
        offset = 0;
        */
        this.address = ARRAY_BASE_OFFSET;
#else[rw]
        super(cap, lim, segment);
        this.isReadOnly = true;
#end[rw]
    }

    Heap$Type$Buffer$RW$($type$[] buf, int off, int len, MemorySegment segment) { // package-private
#if[rw]
        super(-1, off, off + len, buf.length, buf, 0, segment);
        /*
        hb = buf;
        offset = 0;
        */
        this.address = ARRAY_BASE_OFFSET;
#else[rw]
        super(buf, off, len, segment);
        this.isReadOnly = true;
#end[rw]
    }

    protected Heap$Type$Buffer$RW$($type$[] buf,
                                   int mark, int pos, int lim, int cap,
                                   int off, MemorySegment segment)
    {
#if[rw]
        super(mark, pos, lim, cap, buf, off, segment);
        /*
        hb = buf;
        offset = off;
        */
        this.address = ARRAY_BASE_OFFSET + off * ARRAY_INDEX_SCALE;
#else[rw]
        super(buf, mark, pos, lim, cap, off, segment);
        this.isReadOnly = true;
#end[rw]
    }

    public $Type$Buffer slice() {
        int pos = this.position();
        int lim = this.limit();
        int rem = (pos <= lim ? lim - pos : 0);
        return new Heap$Type$Buffer$RW$(hb,
                                        -1,
                                        0,
                                        rem,
                                        rem,
                                        pos + offset, segment);
    }

    @Override
    public $Type$Buffer slice(int index, int length) {
        Objects.checkFromIndexSize(index, length, limit());
        return new Heap$Type$Buffer$RW$(hb,
                                        -1,
                                        0,
                                        length,
                                        length,
                                        index + offset, segment);
    }

    public $Type$Buffer duplicate() {
        return new Heap$Type$Buffer$RW$(hb,
                                        this.markValue(),
                                        this.position(),
                                        this.limit(),
                                        this.capacity(),
                                        offset, segment);
    }

    public $Type$Buffer asReadOnlyBuffer() {
#if[rw]
        return new Heap$Type$BufferR(hb,
                                     this.markValue(),
                                     this.position(),
                                     this.limit(),
                                     this.capacity(),
                                     offset, segment);
#else[rw]
        return duplicate();
#end[rw]
    }

#if[rw]

    protected int ix(int i) {
        return i + offset;
    }

#if[byte]
    private long byteOffset(long i) {
        return address + i;
    }
#end[byte]

    public $type$ get() {
        return hb[ix(nextGetIndex())];
    }

    public $type$ get(int i) {
        return hb[ix(checkIndex(i))];
    }

#if[streamableType]
    $type$ getUnchecked(int i) {
    return hb[ix(i)];
    }
#end[streamableType]

    public $Type$Buffer get($type$[] dst, int offset, int length) {
        checkSession();
        Objects.checkFromIndexSize(offset, length, dst.length);
        int pos = position();
        if (length > limit() - pos)
            throw new BufferUnderflowException();
        System.arraycopy(hb, ix(pos), dst, offset, length);
        position(pos + length);
        return this;
    }

    public $Type$Buffer get(int index, $type$[] dst, int offset, int length) {
        checkSession();
        Objects.checkFromIndexSize(index, length, limit());
        Objects.checkFromIndexSize(offset, length, dst.length);
        System.arraycopy(hb, ix(index), dst, offset, length);
        return this;
    }

    public boolean isDirect() {
        return false;
    }

#end[rw]

    public boolean isReadOnly() {
        return {#if[rw]?false:true};
    }

    public $Type$Buffer put($type$ x) {
#if[rw]
        hb[ix(nextPutIndex())] = x;
        return this;
#else[rw]
        throw new ReadOnlyBufferException();
#end[rw]
    }

    public $Type$Buffer put(int i, $type$ x) {
#if[rw]
        hb[ix(checkIndex(i))] = x;
        return this;
#else[rw]
        throw new ReadOnlyBufferException();
#end[rw]
    }

    public $Type$Buffer put($type$[] src, int offset, int length) {
#if[rw]
        checkSession();
        Objects.checkFromIndexSize(offset, length, src.length);
        int pos = position();
        if (length > limit() - pos)
            throw new BufferOverflowException();
        System.arraycopy(src, offset, hb, ix(pos), length);
        position(pos + length);
        return this;
#else[rw]
        throw new ReadOnlyBufferException();
#end[rw]
    }

    public $Type$Buffer put($Type$Buffer src) {
#if[rw]
        checkSession();
        super.put(src);
        return this;
#else[rw]
        throw new ReadOnlyBufferException();
#end[rw]
    }

    public $Type$Buffer put(int index, $Type$Buffer src, int offset, int length) {
#if[rw]
        checkSession();
        super.put(index, src, offset, length);
        return this;
#else[rw]
        throw new ReadOnlyBufferException();
#end[rw]
    }

    public $Type$Buffer put(int index, $type$[] src, int offset, int length) {
#if[rw]
        checkSession();
        Objects.checkFromIndexSize(index, length, limit());
        Objects.checkFromIndexSize(offset, length, src.length);
        System.arraycopy(src, offset, hb, ix(index), length);
        return this;
#else[rw]
        throw new ReadOnlyBufferException();
#end[rw]
    }

#if[char]

    //
    // Use getChars() to load chars directly into the heap buffer array.
    // For a String or StringBuffer source this improves performance if
    // a proper subsequence is being appended as copying to a new intermediate
    // String object is avoided. For a StringBuilder where either a subsequence
    // or the full sequence of chars is being appended, copying the chars to
    // an intermedite String in StringBuilder::toString is avoided.
    //
    public $Type$Buffer append(CharSequence csq, int start, int end) {
#if[rw]
        if (csq == null)
            return super.append(csq, start, end);

        checkSession();

        Objects.checkFromToIndex(start, end, csq.length());

        int length = end - start;
        int pos = position();
        int lim = limit();
        int rem = (pos <= lim) ? lim - pos : 0;
        if (length > rem)
            throw new BufferOverflowException();

        csq.getChars(start, end, hb, ix(pos));

        position(pos + length);

        return this;
#else[rw]
        throw new ReadOnlyBufferException();
#end[rw]
    }

    public $Type$Buffer append(CharSequence csq) {
#if[rw]
        // See comment regarding StringBuilder on method append() above.
        if (csq instanceof StringBuilder)
            return append(csq, 0, csq.length());

        return super.append(csq);
#else[rw]
        throw new ReadOnlyBufferException();
#end[rw]
    }

    public $Type$Buffer put(String src, int start, int end) {
#if[rw]
        checkSession();
        int length = end - start;
        Objects.checkFromIndexSize(start, length, src.length());
        int pos = position();
        int lim = limit();
        int rem = (pos <= lim) ? lim - pos : 0;
        if (length > rem)
            throw new BufferOverflowException();
        src.getChars(start, end, hb, ix(pos));
        position(pos + length);
        return this;
#else[rw]
        throw new ReadOnlyBufferException();
#end[rw]
    }

#end[char]

    public $Type$Buffer compact() {
#if[rw]
        int pos = position();
        int lim = limit();
        assert (pos <= lim);
        int rem = (pos <= lim ? lim - pos : 0);
        System.arraycopy(hb, ix(pos), hb, ix(0), rem);
        position(rem);
        limit(capacity());
        discardMark();
        return this;
#else[rw]
        throw new ReadOnlyBufferException();
#end[rw]
    }



#if[byte]

    byte _get(int i) {                          // package-private
        return hb[i];
    }

    void _put(int i, byte b) {                  // package-private
#if[rw]
        hb[i] = b;
#else[rw]
        throw new ReadOnlyBufferException();
#end[rw]
    }

    // char

#if[rw]

    public char getChar() {
        return SCOPED_MEMORY_ACCESS.getCharUnaligned(session(), hb, byteOffset(nextGetIndex(2)), bigEndian);
    }

    public char getChar(int i) {
        return SCOPED_MEMORY_ACCESS.getCharUnaligned(session(), hb, byteOffset(checkIndex(i, 2)), bigEndian);
    }

#end[rw]

    public $Type$Buffer putChar(char x) {
#if[rw]
        SCOPED_MEMORY_ACCESS.putCharUnaligned(session(), hb, byteOffset(nextPutIndex(2)), x, bigEndian);
        return this;
#else[rw]
        throw new ReadOnlyBufferException();
#end[rw]
    }

    public $Type$Buffer putChar(int i, char x) {
#if[rw]
        SCOPED_MEMORY_ACCESS.putCharUnaligned(session(), hb, byteOffset(checkIndex(i, 2)), x, bigEndian);
        return this;
#else[rw]
        throw new ReadOnlyBufferException();
#end[rw]
    }

    public CharBuffer asCharBuffer() {
        int pos = position();
        int size = (limit() - pos) >> 1;
        long addr = address + pos;
        return (bigEndian
                ? (CharBuffer)(new ByteBufferAsCharBuffer$RW$B(this,
                                                               -1,
                                                               0,
                                                               size,
                                                               size,
                                                               addr, segment))
                : (CharBuffer)(new ByteBufferAsCharBuffer$RW$L(this,
                                                               -1,
                                                               0,
                                                               size,
                                                               size,
                                                               addr, segment)));
    }


    // short

#if[rw]

    public short getShort() {
        return SCOPED_MEMORY_ACCESS.getShortUnaligned(session(), hb, byteOffset(nextGetIndex(2)), bigEndian);
    }

    public short getShort(int i) {
        return SCOPED_MEMORY_ACCESS.getShortUnaligned(session(), hb, byteOffset(checkIndex(i, 2)), bigEndian);
    }

#end[rw]

    public $Type$Buffer putShort(short x) {
#if[rw]
        SCOPED_MEMORY_ACCESS.putShortUnaligned(session(), hb, byteOffset(nextPutIndex(2)), x, bigEndian);
        return this;
#else[rw]
        throw new ReadOnlyBufferException();
#end[rw]
    }

    public $Type$Buffer putShort(int i, short x) {
#if[rw]
        SCOPED_MEMORY_ACCESS.putShortUnaligned(session(), hb, byteOffset(checkIndex(i, 2)), x, bigEndian);
        return this;
#else[rw]
        throw new ReadOnlyBufferException();
#end[rw]
    }

    public ShortBuffer asShortBuffer() {
        int pos = position();
        int size = (limit() - pos) >> 1;
        long addr = address + pos;
        return (bigEndian
                ? (ShortBuffer)(new ByteBufferAsShortBuffer$RW$B(this,
                                                                 -1,
                                                                 0,
                                                                 size,
                                                                 size,
                                                                 addr, segment))
                : (ShortBuffer)(new ByteBufferAsShortBuffer$RW$L(this,
                                                                 -1,
                                                                 0,
                                                                 size,
                                                                 size,
                                                                 addr, segment)));
    }


    // int

#if[rw]

    public int getInt() {
        return SCOPED_MEMORY_ACCESS.getIntUnaligned(session(), hb, byteOffset(nextGetIndex(4)), bigEndian);
    }

    public int getInt(int i) {
        return SCOPED_MEMORY_ACCESS.getIntUnaligned(session(), hb, byteOffset(checkIndex(i, 4)), bigEndian);
    }

#end[rw]

    public $Type$Buffer putInt(int x) {
#if[rw]
        SCOPED_MEMORY_ACCESS.putIntUnaligned(session(), hb, byteOffset(nextPutIndex(4)), x, bigEndian);
        return this;
#else[rw]
        throw new ReadOnlyBufferException();
#end[rw]
    }

    public $Type$Buffer putInt(int i, int x) {
#if[rw]
        SCOPED_MEMORY_ACCESS.putIntUnaligned(session(), hb, byteOffset(checkIndex(i, 4)), x, bigEndian);
        return this;
#else[rw]
        throw new ReadOnlyBufferException();
#end[rw]
    }

    public IntBuffer asIntBuffer() {
        int pos = position();
        int size = (limit() - pos) >> 2;
        long addr = address + pos;
        return (bigEndian
                ? (IntBuffer)(new ByteBufferAsIntBuffer$RW$B(this,
                                                             -1,
                                                             0,
                                                             size,
                                                             size,
                                                             addr, segment))
                : (IntBuffer)(new ByteBufferAsIntBuffer$RW$L(this,
                                                             -1,
                                                             0,
                                                             size,
                                                             size,
                                                             addr, segment)));
    }


    // long

#if[rw]

    public long getLong() {
        return SCOPED_MEMORY_ACCESS.getLongUnaligned(session(), hb, byteOffset(nextGetIndex(8)), bigEndian);
    }

    public long getLong(int i) {
        return SCOPED_MEMORY_ACCESS.getLongUnaligned(session(), hb, byteOffset(checkIndex(i, 8)), bigEndian);
    }

#end[rw]

    public $Type$Buffer putLong(long x) {
#if[rw]
        SCOPED_MEMORY_ACCESS.putLongUnaligned(session(), hb, byteOffset(nextPutIndex(8)), x, bigEndian);
        return this;
#else[rw]
        throw new ReadOnlyBufferException();
#end[rw]
    }

    public $Type$Buffer putLong(int i, long x) {
#if[rw]
        SCOPED_MEMORY_ACCESS.putLongUnaligned(session(), hb, byteOffset(checkIndex(i, 8)), x, bigEndian);
        return this;
#else[rw]
        throw new ReadOnlyBufferException();
#end[rw]
    }

    public LongBuffer asLongBuffer() {
        int pos = position();
        int size = (limit() - pos) >> 3;
        long addr = address + pos;
        return (bigEndian
                ? (LongBuffer)(new ByteBufferAsLongBuffer$RW$B(this,
                                                               -1,
                                                               0,
                                                               size,
                                                               size,
                                                               addr, segment))
                : (LongBuffer)(new ByteBufferAsLongBuffer$RW$L(this,
                                                               -1,
                                                               0,
                                                               size,
                                                               size,
                                                               addr, segment)));
    }


    // float

#if[rw]

    public float getFloat() {
        int x = SCOPED_MEMORY_ACCESS.getIntUnaligned(session(), hb, byteOffset(nextGetIndex(4)), bigEndian);
        return Float.intBitsToFloat(x);
    }

    public float getFloat(int i) {
        int x = SCOPED_MEMORY_ACCESS.getIntUnaligned(session(), hb, byteOffset(checkIndex(i, 4)), bigEndian);
        return Float.intBitsToFloat(x);
    }

#end[rw]

    public $Type$Buffer putFloat(float x) {
#if[rw]
        int y = Float.floatToRawIntBits(x);
        SCOPED_MEMORY_ACCESS.putIntUnaligned(session(), hb, byteOffset(nextPutIndex(4)), y, bigEndian);
        return this;
#else[rw]
        throw new ReadOnlyBufferException();
#end[rw]
    }

    public $Type$Buffer putFloat(int i, float x) {
#if[rw]
        int y = Float.floatToRawIntBits(x);
        SCOPED_MEMORY_ACCESS.putIntUnaligned(session(), hb, byteOffset(checkIndex(i, 4)), y, bigEndian);
        return this;
#else[rw]
        throw new ReadOnlyBufferException();
#end[rw]
    }

    public FloatBuffer asFloatBuffer() {
        int pos = position();
        int size = (limit() - pos) >> 2;
        long addr = address + pos;
        return (bigEndian
                ? (FloatBuffer)(new ByteBufferAsFloatBuffer$RW$B(this,
                                                                 -1,
                                                                 0,
                                                                 size,
                                                                 size,
                                                                 addr, segment))
                : (FloatBuffer)(new ByteBufferAsFloatBuffer$RW$L(this,
                                                                 -1,
                                                                 0,
                                                                 size,
                                                                 size,
                                                                 addr, segment)));
    }


    // double

#if[rw]

    public double getDouble() {
        long x = SCOPED_MEMORY_ACCESS.getLongUnaligned(session(), hb, byteOffset(nextGetIndex(8)), bigEndian);
        return Double.longBitsToDouble(x);
    }

    public double getDouble(int i) {
        long x = SCOPED_MEMORY_ACCESS.getLongUnaligned(session(), hb, byteOffset(checkIndex(i, 8)), bigEndian);
        return Double.longBitsToDouble(x);
    }

#end[rw]

    public $Type$Buffer putDouble(double x) {
#if[rw]
        long y = Double.doubleToRawLongBits(x);
        SCOPED_MEMORY_ACCESS.putLongUnaligned(session(), hb, byteOffset(nextPutIndex(8)), y, bigEndian);
        return this;
#else[rw]
        throw new ReadOnlyBufferException();
#end[rw]
    }

    public $Type$Buffer putDouble(int i, double x) {
#if[rw]
        long y = Double.doubleToRawLongBits(x);
        SCOPED_MEMORY_ACCESS.putLongUnaligned(session(), hb, byteOffset(checkIndex(i, 8)), y, bigEndian);
        return this;
#else[rw]
        throw new ReadOnlyBufferException();
#end[rw]
    }

    public DoubleBuffer asDoubleBuffer() {
        int pos = position();
        int size = (limit() - pos) >> 3;
        long addr = address + pos;
        return (bigEndian
                ? (DoubleBuffer)(new ByteBufferAsDoubleBuffer$RW$B(this,
                                                                   -1,
                                                                   0,
                                                                   size,
                                                                   size,
                                                                   addr, segment))
                : (DoubleBuffer)(new ByteBufferAsDoubleBuffer$RW$L(this,
                                                                   -1,
                                                                   0,
                                                                   size,
                                                                   size,
                                                                   addr, segment)));
    }


#end[byte]


#if[char]

    String toString(int start, int end) {               // package-private
        try {
            return new String(hb, start + offset, end - start);
        } catch (StringIndexOutOfBoundsException x) {
            throw new IndexOutOfBoundsException();
        }
    }


    // --- Methods to support CharSequence ---

    public CharBuffer subSequence(int start, int end) {
        int pos = position();
        Objects.checkFromToIndex(start, end, limit() - pos);
        return new HeapCharBuffer$RW$(hb,
                                      -1,
                                      pos + start,
                                      pos + end,
                                      capacity(),
                                      offset, segment);
    }

#end[char]

#if[byte]
    @ForceInline
    @Override
    int scaleShifts() {
        return 0;
    }

    @ForceInline
    @Override
    AbstractMemorySegmentImpl heapSegment(Object base,
                                          long offset,
                                          long length,
                                          boolean readOnly,
                                          MemorySessionImpl bufferScope) {
        return SegmentFactories.arrayOf$Type$Segment(base, offset, length, readOnly, bufferScope);
    }
#end[byte]

#if[!byte]

    public ByteOrder order() {
        return ByteOrder.nativeOrder();
    }
#end[!byte]
#if[char]

    ByteOrder charRegionOrder() {
        return order();
    }
#end[char]
}