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src/java.base/share/classes/jdk/internal/reflect/NativeMethodAccessorImpl.java

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32     switches to bytecode-based implementation */
33 
34 class NativeMethodAccessorImpl extends MethodAccessorImpl {
35      private static final Unsafe U = Unsafe.getUnsafe();
36      private static final long GENERATED_OFFSET
37         = U.objectFieldOffset(NativeMethodAccessorImpl.class, "generated");
38 
39     private final Method method;
40     private final DelegatingMethodAccessorImpl parent;
41     private int numInvocations;
42     private volatile int generated;
43 
44     NativeMethodAccessorImpl(Method method) {
45         this.method = method;
46         this.parent = new DelegatingMethodAccessorImpl(this);
47     }
48 
49     public Object invoke(Object obj, Object[] args)
50         throws IllegalArgumentException, InvocationTargetException
51     {
52         // We can't inflate methods belonging to vm-anonymous classes because
53         // that kind of class can't be referred to by name, hence can't be
54         // found from the generated bytecode.
55         if (++numInvocations > ReflectionFactory.inflationThreshold()
56                 && !method.getDeclaringClass().isHidden()
57                 && generated == 0
58                 && U.compareAndSetInt(this, GENERATED_OFFSET, 0, 1)) {
59             try {
60                 MethodAccessorImpl acc = (MethodAccessorImpl)
61                     new MethodAccessorGenerator().
62                         generateMethod(method.getDeclaringClass(),
63                                        method.getName(),
64                                        method.getParameterTypes(),
65                                        method.getReturnType(),
66                                        method.getExceptionTypes(),
67                                        method.getModifiers());
68                 parent.setDelegate(acc);
69             } catch (Throwable t) {
70                 // Throwable happens in generateMethod, restore generated to 0
71                 generated = 0;
72                 throw t;

32     switches to bytecode-based implementation */
33 
34 class NativeMethodAccessorImpl extends MethodAccessorImpl {
35      private static final Unsafe U = Unsafe.getUnsafe();
36      private static final long GENERATED_OFFSET
37         = U.objectFieldOffset(NativeMethodAccessorImpl.class, "generated");
38 
39     private final Method method;
40     private final DelegatingMethodAccessorImpl parent;
41     private int numInvocations;
42     private volatile int generated;
43 
44     NativeMethodAccessorImpl(Method method) {
45         this.method = method;
46         this.parent = new DelegatingMethodAccessorImpl(this);
47     }
48 
49     public Object invoke(Object obj, Object[] args)
50         throws IllegalArgumentException, InvocationTargetException
51     {
52         // We can't inflate methods belonging to hidden classes because
53         // that kind of class can't be referred to by name, hence can't be
54         // found from the generated bytecode.
55         if (++numInvocations > ReflectionFactory.inflationThreshold()
56                 && !method.getDeclaringClass().isHidden()
57                 && generated == 0
58                 && U.compareAndSetInt(this, GENERATED_OFFSET, 0, 1)) {
59             try {
60                 MethodAccessorImpl acc = (MethodAccessorImpl)
61                     new MethodAccessorGenerator().
62                         generateMethod(method.getDeclaringClass(),
63                                        method.getName(),
64                                        method.getParameterTypes(),
65                                        method.getReturnType(),
66                                        method.getExceptionTypes(),
67                                        method.getModifiers());
68                 parent.setDelegate(acc);
69             } catch (Throwable t) {
70                 // Throwable happens in generateMethod, restore generated to 0
71                 generated = 0;
72                 throw t;
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