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8209120: Archive the Integer.IntegerCache

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Reviewed-by: jiangli, alanb, plevart, iklam, mchung
This commit is contained in:
Claes Redestad 2018-08-13 19:21:43 +02:00
parent 8044814e30
commit 5c3008fbc4
8 changed files with 272 additions and 5 deletions
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19
src/java.base/share/classes/java/lang/Integer.java
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@ -997,7 +997,8 @@ public final class Integer extends Number implements Comparable<Integer> {
private static class IntegerCache {
static final int low = -128;
static final int high;
static final Integer cache[];
static final Integer[] cache;
static Integer[] archivedCache;
static {
// high value may be configured by property
@ -1016,11 +1017,19 @@ public final class Integer extends Number implements Comparable<Integer> {
}
high = h;
cache = new Integer[(high - low) + 1];
int j = low;
for(int k = 0; k < cache.length; k++)
cache[k] = new Integer(j++);
// Load IntegerCache.archivedCache from archive, if possible
VM.initializeFromArchive(IntegerCache.class);
int size = (high - low) + 1;
// Use the archived cache if it exists and is large enough
if (archivedCache == null || size > archivedCache.length) {
Integer[] c = new Integer[size];
int j = low;
for(int k = 0; k < c.length; k++)
c[k] = new Integer(j++);
archivedCache = c;
}
cache = archivedCache;
// range [-128, 127] must be interned (JLS7 5.1.7)
assert IntegerCache.high >= 127;
}