8274299: Make Method/Constructor/Field accessors @stable

Reviewed-by: redestad, mchung

src/java.base/share/classes/java/lang/reflect/Constructor.java

@@ -30,6 +30,7 @@
 import jdk.internal.reflect.ConstructorAccessor;
 import jdk.internal.reflect.Reflection;
 import jdk.internal.vm.annotation.ForceInline;
+import jdk.internal.vm.annotation.Stable;
 import sun.reflect.annotation.TypeAnnotation;
 import sun.reflect.annotation.TypeAnnotationParser;
 import sun.reflect.generics.repository.ConstructorRepository;
@@ -62,10 +63,12 @@
  * @since 1.1
  */
 public final class Constructor<T> extends Executable {
+    @Stable
     private Class<T>            clazz;
     private int                 slot;
     private Class<?>[]          parameterTypes;
     private Class<?>[]          exceptionTypes;
+    @Stable
     private int                 modifiers;
     // Generics and annotations support
     private transient String    signature;
@@ -94,7 +97,8 @@ ConstructorRepository getGenericInfo() {
         return genericInfo; //return cached repository
     }
 
-    private volatile ConstructorAccessor constructorAccessor;
+    @Stable
+    private ConstructorAccessor constructorAccessor;
     // For sharing of ConstructorAccessors. This branching structure
     // is currently only two levels deep (i.e., one root Constructor
     // and potentially many Constructor objects pointing to it.)
@@ -491,7 +495,7 @@ T newInstanceWithCaller(Object[] args, boolean checkAccess, Class<?> caller)
         if ((clazz.getModifiers() & Modifier.ENUM) != 0)
             throw new IllegalArgumentException("Cannot reflectively create enum objects");
 
-        ConstructorAccessor ca = constructorAccessor;   // read volatile
+        ConstructorAccessor ca = constructorAccessor;   // read @Stable
         if (ca == null) {
             ca = acquireConstructorAccessor();
         }
@@ -532,8 +536,8 @@ public boolean isSynthetic() {
     private ConstructorAccessor acquireConstructorAccessor() {
         // First check to see if one has been created yet, and take it
         // if so.
-        ConstructorAccessor tmp = null;
-        if (root != null) tmp = root.getConstructorAccessor();
+        Constructor<?> root = this.root;
+        ConstructorAccessor tmp = root == null ? null : root.getConstructorAccessor();
         if (tmp != null) {
             constructorAccessor = tmp;
         } else {
@@ -556,6 +560,7 @@ ConstructorAccessor getConstructorAccessor() {
     void setConstructorAccessor(ConstructorAccessor accessor) {
         constructorAccessor = accessor;
         // Propagate up
+        Constructor<?> root = this.root;
         if (root != null) {
             root.setConstructorAccessor(accessor);
         }