@Override
public void run() {
boolean allocate = blobs.isEmpty() || Helper.RNG.nextBoolean();
if (allocate) {
int type = Helper.RNG.nextInt(BLOB_TYPES.length);
long addr =
Helper.WHITE_BOX.allocateCodeBlob(Helper.RNG.nextInt(MAX_BLOB_SIZE), BLOB_TYPES[type].id);
if (addr != 0) {
blobs.add(addr);
}
} else {
int index = Helper.RNG.nextInt(blobs.size());
Helper.WHITE_BOX.freeCodeBlob(blobs.remove(index));
}
}
/*
* @test RandomAllocationTest
* @library /testlibrary /../../test/lib
* @modules java.base/sun.misc
* java.management
* @build RandomAllocationTest
* @run main ClassFileInstaller sun.hotspot.WhiteBox
* sun.hotspot.WhiteBox$WhiteBoxPermission
* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
* -XX:CompileCommand=dontinline,Helper$TestCase::method
* -XX:+WhiteBoxAPI -XX:-SegmentedCodeCache RandomAllocationTest
* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
* -XX:CompileCommand=dontinline,Helper$TestCase::method
* -XX:+WhiteBoxAPI -XX:+SegmentedCodeCache RandomAllocationTest
* @summary stressing code cache by allocating randomly sized "dummy" code blobs
*/
public class RandomAllocationTest implements Runnable {
private static final long CODE_CACHE_SIZE =
Helper.WHITE_BOX.getUintxVMFlag("ReservedCodeCacheSize");
private static final int MAX_BLOB_SIZE = (int) (CODE_CACHE_SIZE >> 7);
private static final BlobType[] BLOB_TYPES = BlobType.getAvailable().toArray(new BlobType[0]);
public static void main(String[] args) {
new CodeCacheStressRunner(new RandomAllocationTest()).runTest();
}
private final ArrayList<Long> blobs = new ArrayList<>();
@Override
public void run() {
boolean allocate = blobs.isEmpty() || Helper.RNG.nextBoolean();
if (allocate) {
int type = Helper.RNG.nextInt(BLOB_TYPES.length);
long addr =
Helper.WHITE_BOX.allocateCodeBlob(Helper.RNG.nextInt(MAX_BLOB_SIZE), BLOB_TYPES[type].id);
if (addr != 0) {
blobs.add(addr);
}
} else {
int index = Helper.RNG.nextInt(blobs.size());
Helper.WHITE_BOX.freeCodeBlob(blobs.remove(index));
}
}
}
