1 /*
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23 
24 /**
25  * @test
26  * @summary Sanity test for GetClassFields with value classes.
27  * @requires vm.jvmti
28  * @modules java.base/jdk.internal.vm.annotation
29  * @enablePreview
30  * @run main/othervm/native -agentlib:ValueGetClassFields -XX:+EnableValhalla ValueGetClassFields
31  */
32 
33 import jdk.internal.vm.annotation.LooselyConsistentValue;
34 import jdk.internal.vm.annotation.NullRestricted;
35 
36 public class ValueGetClassFields {
37 
38     private static final String agentLib = "ValueGetClassFields";
39 
40     @LooselyConsistentValue
41     private static value class ValueClass {
42         public int f1;
43         public int f2;
44 
45         public ValueClass(int v1, int v2) { f1 = v1; f2 = v2; }
46     }
47 
48     private static value class ValueHolder {
49         public ValueClass f1;
50         @NullRestricted
51         public ValueClass f2;
52 
53         public static ValueClass s1 = new ValueClass(0, 1);
54 
55         public ValueHolder(int v) {
56             f1 = new ValueClass(v, v + 100);
57             f2 = new ValueClass(v + 1, v + 200);
58         }
59     }
60 
61     public static void main(String[] args) throws Exception {
62         try {
63             System.loadLibrary(agentLib);
64         } catch (UnsatisfiedLinkError ex) {
65             System.err.println("Failed to load " + agentLib + " lib");
66             System.err.println("java.library.path: " + System.getProperty("java.library.path"));
67             throw ex;
68         }
69 
70         testGetClassFields(ValueClass.class, 2);
71         testGetClassFields(ValueHolder.class, 3);
72     }
73 
74     private static void testGetClassFields(Class cls, int fieldNum) throws Exception {
75         String className = cls.getName();
76         // Ensure the class is prepared.
77         cls = Class.forName(className);
78         log(">> Testing GetClassFields for " + className);
79         if (!nTestGetClassFields(cls, fieldNum)) {
80             throw new RuntimeException("ERROR: " + className);
81         }
82         log("<< Testing " + className + " - OK");
83         log("");
84     }
85 
86     private static void log(String msg) {
87         System.out.println(msg);
88     }
89 
90     private static native boolean nTestGetClassFields(Class cls, int fieldNum);
91 }