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8223593: Refactor code for reallocating storage

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Reviewed-by: prappo, plevart, rriggs, smarks
This commit is contained in:
Ivan Gerasimov 2019-05-21 18:40:29 -07:00
parent 54d0b2a8d6
commit 218204b1a3
11 changed files with 129 additions and 247 deletions
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21
src/java.base/share/classes/java/io/BufferedInputStream.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1994, 2016, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1994, 2019, 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
@ -26,6 +26,7 @@
package java.io;
import jdk.internal.misc.Unsafe;
import jdk.internal.util.ArraysSupport;
/**
* A <code>BufferedInputStream</code> adds
@ -53,14 +54,6 @@ class BufferedInputStream extends FilterInputStream {
private static int DEFAULT_BUFFER_SIZE = 8192;
/**
* The maximum size of array to allocate.
* Some VMs reserve some header words in an array.
* Attempts to allocate larger arrays may result in
* OutOfMemoryError: Requested array size exceeds VM limit
*/
private static int MAX_BUFFER_SIZE = Integer.MAX_VALUE - 8;
/**
* As this class is used early during bootstrap, it's motivated to use
* Unsafe.compareAndSetObject instead of AtomicReferenceFieldUpdater
@ -220,7 +213,7 @@ class BufferedInputStream extends FilterInputStream {
byte[] buffer = getBufIfOpen();
if (markpos < 0)
pos = 0; /* no mark: throw away the buffer */
else if (pos >= buffer.length) /* no room left in buffer */
else if (pos >= buffer.length) { /* no room left in buffer */
if (markpos > 0) { /* can throw away early part of the buffer */
int sz = pos - markpos;
System.arraycopy(buffer, markpos, buffer, 0, sz);
@ -229,11 +222,10 @@ class BufferedInputStream extends FilterInputStream {
} else if (buffer.length >= marklimit) {
markpos = -1; /* buffer got too big, invalidate mark */
pos = 0; /* drop buffer contents */
} else if (buffer.length >= MAX_BUFFER_SIZE) {
throw new OutOfMemoryError("Required array size too large");
} else { /* grow buffer */
int nsz = (pos <= MAX_BUFFER_SIZE - pos) ?
pos * 2 : MAX_BUFFER_SIZE;
int nsz = ArraysSupport.newLength(pos,
1, /* minimum growth */
pos /* preferred growth */);
if (nsz > marklimit)
nsz = marklimit;
byte[] nbuf = new byte[nsz];
@ -248,6 +240,7 @@ class BufferedInputStream extends FilterInputStream {
}
buffer = nbuf;
}
}
count = pos;
int n = getInIfOpen().read(buffer, pos, buffer.length - pos);
if (n > 0)