replace __len__ call in memoryview messages

Author: timfel

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/memoryview/PMemoryView.java

@@ -43,13 +43,11 @@
 import com.oracle.graal.python.builtins.objects.object.PythonBuiltinObject;
 import com.oracle.graal.python.builtins.objects.object.PythonObjectLibrary;
 import com.oracle.graal.python.builtins.objects.type.LazyPythonClass;
-import com.oracle.graal.python.nodes.SpecialMethodNames;
 import com.oracle.graal.python.nodes.attributes.ReadAttributeFromDynamicObjectNode;
-import com.oracle.graal.python.nodes.call.special.LookupAndCallUnaryNode.LookupAndCallUnaryDynamicNode;
 import com.oracle.graal.python.nodes.util.CastToByteNode;
-import com.oracle.graal.python.nodes.util.CastToJavaIntNode;
 import com.oracle.truffle.api.dsl.Cached;
 import com.oracle.truffle.api.dsl.Cached.Shared;
+import com.oracle.truffle.api.library.CachedLibrary;
 import com.oracle.truffle.api.library.ExportLibrary;
 import com.oracle.truffle.api.library.ExportMessage;
 
@@ -70,21 +68,19 @@ boolean isBuffer() {
     @ExportMessage
     int getBufferLength(
                     @Shared("readNativeMemoryViewNode") @Cached ReadAttributeFromDynamicObjectNode readNativeMemoryViewNode,
-                    @Shared("lenNode") @Cached LookupAndCallUnaryDynamicNode lenNode,
-                    @Shared("castToIntNode") @Cached CastToJavaIntNode castToIntNode) {
+                    @CachedLibrary(limit = "1") PythonObjectLibrary lib) {
         Object nativeMemoryViewObject = readNativeMemoryViewNode.execute(getStorage(), C_MEMORYVIEW);
-        return castToIntNode.execute(lenNode.executeObject(nativeMemoryViewObject, SpecialMethodNames.__LEN__));
+        return lib.length(nativeMemoryViewObject);
     }
 
     @ExportMessage
     byte[] getBufferBytes(
                     @Shared("readNativeMemoryViewNode") @Cached ReadAttributeFromDynamicObjectNode readNativeMemoryViewNode,
-                    @Shared("lenNode") @Cached LookupAndCallUnaryDynamicNode lenNode,
-                    @Shared("castToIntNode") @Cached CastToJavaIntNode castToIntNode,
+                    @CachedLibrary(limit = "1") PythonObjectLibrary lib,
                     @Cached PInteropSubscriptNode subscriptNode,
                     @Cached CastToByteNode castToByteNode) {
         Object nativeMemoryViewObject = readNativeMemoryViewNode.execute(getStorage(), C_MEMORYVIEW);
-        int len = castToIntNode.execute(lenNode.executeObject(nativeMemoryViewObject, SpecialMethodNames.__LEN__));
+        int len = lib.length(nativeMemoryViewObject);
         byte[] data = new byte[len];
         for (int i = 0; i < data.length; i++) {
             data[i] = castToByteNode.execute(null, subscriptNode.execute(nativeMemoryViewObject, i));