8073866: Fix for 8064703 is not sufficient
Summary: side effects between allocation and arraycopy can be reexecuted, unreachable uninitialized array can be seen by GCs
Reviewed-by: kvn, vlivanov
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/*
* @test
* @bug 8073866
* @summary Fix for 8064703 may also cause stores between the allocation and arraycopy to be rexecuted after a deoptimization
* @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement TestArrayCopyBadReexec
*
*/
public class TestArrayCopyBadReexec {
static int val;
static int[] m1(int[] src, int l) {
if (src == null) {
return null;
}
int[] dest = new int[10];
val++;
try {
System.arraycopy(src, 0, dest, 0, l);
} catch (IndexOutOfBoundsException npe) {
}
return dest;
}
static public void main(String[] args) {
int[] src = new int[10];
int[] res = null;
boolean success = true;
for (int i = 0; i < 20000; i++) {
m1(src, 10);
}
int val_before = val;
m1(src, -1);
if (val - val_before != 1) {
System.out.println("Bad increment: " + (val - val_before));
throw new RuntimeException("Test failed");
}
}
}