@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)); } } }