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8300236: Use VarHandle access in Data(Input | Output)Stream classes

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Reviewed-by: rriggs, alanb
This commit is contained in:
Per Minborg 2023-01-25 12:54:27 +00:00
parent a5d8e12872
commit 74e1a8bfa8
11 changed files with 869 additions and 364 deletions
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40
src/java.base/share/classes/java/io/DataOutputStream.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1994, 2022, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1994, 2023, 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
@ -25,6 +25,8 @@
package java.io;
import jdk.internal.util.ByteArray;
/**
* A data output stream lets an application write primitive Java data
* types to an output stream in a portable way. An application can
@ -170,8 +172,7 @@ public class DataOutputStream extends FilterOutputStream implements DataOutput {
* @see java.io.FilterOutputStream#out
*/
public final void writeShort(int v) throws IOException {
writeBuffer[0] = (byte)(v >>> 8);
writeBuffer[1] = (byte)(v >>> 0);
ByteArray.setUnsignedShort(writeBuffer, 0, v);
out.write(writeBuffer, 0, 2);
incCount(2);
}
@ -186,8 +187,7 @@ public class DataOutputStream extends FilterOutputStream implements DataOutput {
* @see java.io.FilterOutputStream#out
*/
public final void writeChar(int v) throws IOException {
writeBuffer[0] = (byte)(v >>> 8);
writeBuffer[1] = (byte)(v >>> 0);
ByteArray.setUnsignedShort(writeBuffer, 0, v);
out.write(writeBuffer, 0, 2);
incCount(2);
}
@ -202,10 +202,7 @@ public class DataOutputStream extends FilterOutputStream implements DataOutput {
* @see java.io.FilterOutputStream#out
*/
public final void writeInt(int v) throws IOException {
writeBuffer[0] = (byte)(v >>> 24);
writeBuffer[1] = (byte)(v >>> 16);
writeBuffer[2] = (byte)(v >>> 8);
writeBuffer[3] = (byte)(v >>> 0);
ByteArray.setInt(writeBuffer, 0, v);
out.write(writeBuffer, 0, 4);
incCount(4);
}
@ -220,14 +217,7 @@ public class DataOutputStream extends FilterOutputStream implements DataOutput {
* @see java.io.FilterOutputStream#out
*/
public final void writeLong(long v) throws IOException {
writeBuffer[0] = (byte)(v >>> 56);
writeBuffer[1] = (byte)(v >>> 48);
writeBuffer[2] = (byte)(v >>> 40);
writeBuffer[3] = (byte)(v >>> 32);
writeBuffer[4] = (byte)(v >>> 24);
writeBuffer[5] = (byte)(v >>> 16);
writeBuffer[6] = (byte)(v >>> 8);
writeBuffer[7] = (byte)(v >>> 0);
ByteArray.setLong(writeBuffer, 0, v);
out.write(writeBuffer, 0, 8);
incCount(8);
}
@ -246,7 +236,9 @@ public class DataOutputStream extends FilterOutputStream implements DataOutput {
* @see java.lang.Float#floatToIntBits(float)
*/
public final void writeFloat(float v) throws IOException {
writeInt(Float.floatToIntBits(v));
ByteArray.setFloat(writeBuffer, 0, v);
out.write(writeBuffer, 0, 4);
incCount(4);
}
/**
@ -263,7 +255,9 @@ public class DataOutputStream extends FilterOutputStream implements DataOutput {
* @see java.lang.Double#doubleToLongBits(double)
*/
public final void writeDouble(double v) throws IOException {
writeLong(Double.doubleToLongBits(v));
ByteArray.setDouble(writeBuffer, 0, v);
out.write(writeBuffer, 0, 8);
incCount(8);
}
/**
@ -301,8 +295,7 @@ public class DataOutputStream extends FilterOutputStream implements DataOutput {
int len = s.length();
for (int i = 0 ; i < len ; i++) {
int v = s.charAt(i);
writeBuffer[0] = (byte)(v >>> 8);
writeBuffer[1] = (byte)(v >>> 0);
ByteArray.setUnsignedShort(writeBuffer, 0, v);
out.write(writeBuffer, 0, 2);
}
incCount(len * 2);
@ -379,9 +372,8 @@ public class DataOutputStream extends FilterOutputStream implements DataOutput {
}
int count = 0;
bytearr[count++] = (byte) ((utflen >>> 8) & 0xFF);
bytearr[count++] = (byte) ((utflen >>> 0) & 0xFF);
ByteArray.setUnsignedShort(bytearr, count, utflen);
count += 2;
int i = 0;
for (i = 0; i < strlen; i++) { // optimized for initial run of ASCII
int c = str.charAt(i);