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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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19
src/java.base/share/classes/java/lang/StringLatin1.java
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@ -35,6 +35,7 @@ import java.util.stream.IntStream;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
import jdk.internal.HotSpotIntrinsicCandidate;
import jdk.internal.util.ArraysSupport;
import static java.lang.String.LATIN1;
import static java.lang.String.UTF16;
@ -42,14 +43,6 @@ import static java.lang.String.checkOffset;
final class StringLatin1 {
/**
* The maximum size of array to allocate (unless necessary).
* 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 final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8;
public static char charAt(byte[] value, int index) {
if (index < 0 || index >= value.length) {
throw new StringIndexOutOfBoundsException(index);
@ -353,15 +346,7 @@ final class StringLatin1 {
i += targLen;
while ((j = indexOf(value, valLen, targ, targLen, i)) > 0) {
if (++p == pos.length) {
int cap = p + (p >> 1);
// overflow-conscious code
if (cap - MAX_ARRAY_SIZE > 0) {
if (p == MAX_ARRAY_SIZE) {
throw new OutOfMemoryError();
}
cap = MAX_ARRAY_SIZE;
}
pos = Arrays.copyOf(pos, cap);
pos = Arrays.copyOf(pos, ArraysSupport.newLength(p, 1, p >> 1));
}
pos[p] = j;
i = j + targLen;