--- a/jvmci/jdk.vm.ci.meta/src/jdk/vm/ci/meta/MemoryAccessProvider.java	Thu Mar 30 23:54:54 2017 +0200
+++ b/jvmci/jdk.vm.ci.meta/src/jdk/vm/ci/meta/MemoryAccessProvider.java	Sat Apr 01 00:28:33 2017 +0200
@@ -35,11 +35,9 @@
      * @param displacement the displacement within the object in bytes
      * @param bits the number of bits to read from memory
      * @return the read value encapsulated in a {@link JavaConstant} object of {@link JavaKind} kind
-     *         or {@code null} if {@code base} is a boxed object and the read address does not
-     *         denote a location holding an {@code kind} value
-     * @throws IllegalArgumentException if {@code kind} is {@link JavaKind#Void} or not
-     *             {@linkplain JavaKind#isPrimitive() primitive} kind or {@code bits} is not 8, 16,
-     *             32 or 64
+     * @throws IllegalArgumentException if the read is out of bounds of the object or {@code kind}
+     *             is {@link JavaKind#Void} or not {@linkplain JavaKind#isPrimitive() primitive}
+     *             kind or {@code bits} is not 8, 16, 32 or 64
      */
     JavaConstant readPrimitiveConstant(JavaKind kind, Constant base, long displacement, int bits) throws IllegalArgumentException;
 
@@ -48,9 +46,9 @@
      *
      * @param base the base address from which the value is read
      * @param displacement the displacement within the object in bytes
-     * @return the read value encapsulated in a {@link Constant} object or {@code null} if the
-     *         address computed from {@code base} and {@code displacement} does not denote a
-     *         location holding an {@code Object} value
+     * @return the read value encapsulated in a {@link Constant} object
+     * @throws IllegalArgumentException if the address computed from {@code base} and
+     *             {@code displacement} does not denote a location holding an {@code Object} value
      */
     JavaConstant readObjectConstant(Constant base, long displacement);
 }