test/hotspot/jtreg/compiler/arraycopy/TestArrayCopyDisjointLarge.java

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package compiler.arraycopy;
import java.util.Random;

/**
 * @test
 * @bug 8310159
 * @summary Test large arrayCopy.
 *
 * @run main/timeout=600 compiler.arraycopy.TestArrayCopyDisjointLarge
 *
 */

public class TestArrayCopyDisjointLarge {

    public static final int ARRLEN = 4194304;
    public static int fromPos, toPos;
    public static byte[] fromByteArr, toByteArr;

    public static void setup() {
        fromPos = 0;
        toPos = 0;

        fromByteArr = new byte[ARRLEN];
        toByteArr = new byte[ARRLEN];
        for (int i = 0 ; i < ARRLEN ; i++) {
            fromByteArr[i] = (byte)i;
        }
    }

    public static void validate(String msg, byte[] toByteArr, int length, int fromPos, int toPos) {
        for(int i = 0 ; i < length; i++) {
            if (fromByteArr[i + fromPos] != toByteArr[i + toPos]) {
                System.out.println(msg + "[" + toByteArr.getClass() + "] Result mismtach at i = " + i
                                + " expected = " + fromByteArr[i + fromPos]
                                + " actual   = " + toByteArr[i + toPos]
                                + " fromPos = " + fromPos
                                + " toPos = " + toPos);
                throw new Error("Fail");
            }
        }
    }

    public static void testByte(int length, int fromPos, int toPos) {
        System.arraycopy(fromByteArr, fromPos, toByteArr, toPos, length);
        validate(" Test ByteArr ", toByteArr, length, fromPos, toPos);
    }

    public static void main(String [] args) {
        int base_size = 2621440;
        Random r = new Random(1024);
        int [] lengths = {base_size - 1, base_size, base_size + 1, base_size + 63, base_size + 64,
                                base_size + 65, base_size + 255, base_size + 256, base_size + 257,
                                base_size + r.nextInt(2048)};
        setup();

        for (int i = 0 ; i < 20 ; i++ ) {
            testByte(lengths[i % lengths.length], 0, 0);
            testByte(lengths[i % lengths.length], 0, 9);
            testByte(lengths[i % lengths.length], 9, 0);
            testByte(lengths[i % lengths.length], 9, 9);
            testByte(lengths[i % lengths.length], r.nextInt(2048) , r.nextInt(2048));
        }
    }
}