Update JNIObjectHandles.java

resolved some grammar mistakes and updated the split point in JNIGlobalHandles and replaced it from bit 62 to bit 30, because it did not fit in the global handles range

Author: asselyam

substratevm/src/com.oracle.svm.core/src/com/oracle/svm/core/jni/JNIObjectHandles.java

@@ -309,20 +309,20 @@ final class JNIGlobalHandles {
     private static final SignedWord MSB = Word.signed(1L << 63);
 
     // Define the mid-point to split the range in half
-    private static final SignedWord GLOBAL_RANGE_SPLIT_POINT = Word.signed(1L << 62);
+    private static final SignedWord HANDLE_RANGE_SPLIT_POINT = Word.signed(1L << 30);
 
     // Strong global handles will occupy the lower half of the global handles range
-    public static final SignedWord STRONG_GLOBAL_RANGE_MIN = MIN_VALUE;
-    public static final SignedWord STRONG_GLOBAL_RANGE_MAX = GLOBAL_RANGE_SPLIT_POINT.substract(1);
+    public static final SignedWord STRONG_GLOBAL_RANGE_MIN = JNIObjectHandles.nullHandle().add(1);;
+    public static final SignedWord STRONG_GLOBAL_RANGE_MAX = HANDLE_RANGE_SPLIT_POINT.subtract(1);
 
     // Weak global handles will occupy the upper half of the global handles range
-    public static final SignedWord WEAK_GLOBAL_RANGE_MIN = GLOBAL_RANGE_SPLIT_POINT;
-    public static final SignedWord WEAK_GLOBAL_RANGE_MAX = MAX_VALUE;
+    public static final SignedWord WEAK_GLOBAL_RANGE_MIN = HANDLE_RANGE_SPLIT_POINT;
+    public static final SignedWord WEAK_GLOBAL_RANGE_MAX = HANDLE_BITS_MASK;
 
     private static final ObjectHandlesImpl strongGlobalHandles
-            = new ObjectHandlesImpl(STRONG_GLOBAL_RANGE_MIN.add(1), STRONG_GLOBAL_RANGE_MAX, JNIObjectHandles.nullHandle());
+            = new ObjectHandlesImpl(STRONG_GLOBAL_RANGE_MIN, STRONG_GLOBAL_RANGE_MAX, JNIObjectHandles.nullHandle());
     private static final ObjectHandlesImpl weakGlobalHandles
-            = new ObjectHandlesImpl(WEAK_GLOBAL_RANGE_MIN.add(1), WEAK_GLOBAL_RANGE_MAX, JNIObjectHandles.nullHandle());
+            = new ObjectHandlesImpl(WEAK_GLOBAL_RANGE_MIN, WEAK_GLOBAL_RANGE_MAX, JNIObjectHandles.nullHandle());
 
     @Uninterruptible(reason = "Called from uninterruptible code.", mayBeInlined = true)
     static boolean isInRange(JNIObjectHandle handle) {
@@ -378,7 +378,7 @@ static <T> T getObject(JNIObjectHandle handle) {
             return weakGlobalHandles.get(decode((handle)));
         }
 
-        throw throwIllegalArgumentException();
+        throw new IllegalArgumentException("Invalid handle");
     }
 
     static JNIObjectRefType getHandleType(JNIObjectHandle handle) {