--- a/src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/CompilerToVM.java	Wed Nov 29 13:58:28 2017 +0100
+++ b/src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/CompilerToVM.java	Fri Dec 22 18:34:36 2017 +0100
@@ -135,8 +135,9 @@
     /**
      * Gets the implementor for the interface class {@code type}.
      *
-     * @return the implementor if there is a single implementor, 0 if there is no implementor, or
-     *         {@code type} itself if there is more than one implementor
+     * @return the implementor if there is a single implementor, {@code null} if there is no
+     *         implementor, or {@code type} itself if there is more than one implementor
+     * @throws IllegalArgumentException if type is not an interface type
      */
     native HotSpotResolvedObjectTypeImpl getImplementor(HotSpotResolvedObjectTypeImpl type);
 
@@ -256,14 +257,13 @@
     native void resolveInvokeHandleInPool(HotSpotConstantPool constantPool, int cpi);
 
     /**
-     * If {@code cpi} denotes an entry representing a resolved dynamic adapter
-     * (see {@code resolveInvokeDynamicInPool} and {@code resolveInvokeHandleInPool}),
-     * return the opcode of the instruction for which the resolution was performed
-     * ({@code invokedynamic} or {@code invokevirtual}}, or {@code -1} otherwise.
+     * If {@code cpi} denotes an entry representing a resolved dynamic adapter (see
+     * {@code resolveInvokeDynamicInPool} and {@code resolveInvokeHandleInPool}), return the opcode
+     * of the instruction for which the resolution was performed ({@code invokedynamic} or
+     * {@code invokevirtual}}, or {@code -1} otherwise.
      */
     native int isResolvedInvokeHandleInPool(HotSpotConstantPool constantPool, int cpi);
 
-
     /**
      * Gets the list of type names (in the format of {@link JavaType#getName()}) denoting the
      * classes that define signature polymorphic methods.
@@ -388,7 +388,7 @@
     /**
      * Gets the static initializer of {@code type}.
      *
-     * @return 0 if {@code type} has no static initializer
+     * @return {@code null} if {@code type} has no static initializer
      */
     native HotSpotResolvedJavaMethodImpl getClassInitializer(HotSpotResolvedObjectTypeImpl type);
 
@@ -468,7 +468,8 @@
     native long getLocalVariableTableStart(HotSpotResolvedJavaMethodImpl method);
 
     /**
-     * Sets flags on {@code method} indicating that it should never be inlined or compiled by the VM.
+     * Sets flags on {@code method} indicating that it should never be inlined or compiled by the
+     * VM.
      */
     native void setNotInlinableOrCompilable(HotSpotResolvedJavaMethodImpl method);