Avoid NPE in ctypes

Author: msimacek

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/ctypes/PyCFuncPtrBuiltins.java

@@ -40,6 +40,7 @@
  */
 package com.oracle.graal.python.builtins.modules.ctypes;
 
+import static com.oracle.graal.python.builtins.PythonBuiltinClassType.NotImplementedError;
 import static com.oracle.graal.python.builtins.PythonBuiltinClassType.RuntimeError;
 import static com.oracle.graal.python.builtins.modules.ctypes.CDataTypeBuiltins.T__HANDLE;
 import static com.oracle.graal.python.builtins.modules.ctypes.CtypesModuleBuiltins.FUNCFLAG_CDECL;
@@ -126,6 +127,7 @@
 import com.oracle.graal.python.runtime.PythonContext;
 import com.oracle.graal.python.runtime.exception.PException;
 import com.oracle.graal.python.runtime.object.PythonObjectFactory;
+import com.oracle.truffle.api.CompilerDirectives;
 import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
 import com.oracle.truffle.api.dsl.Bind;
 import com.oracle.truffle.api.dsl.Cached;
@@ -499,6 +501,11 @@ Object PyCFuncPtr_call(VirtualFrame frame, PyCFuncPtrObject self, Object[] inarg
 
             int[] props = new int[3];
             NativeFunction pProc = handleFromPointerNode.getNativeFunction(inliningTarget, readPointerNode.execute(inliningTarget, self.b_ptr));
+            if (pProc == null) {
+                CompilerDirectives.transferToInterpreterAndInvalidate();
+                // TODO this happens in numpy/core/tests/test_ufunc.py::TestLowlevelAPIAccess::test_loop_access
+                throw PRaiseNode.raiseUncached(inliningTarget, NotImplementedError, ErrorMessages.CTYPES_FUNCTION_CALL_COULD_NOT_OBTAIN_FUNCTION_POINTER);
+            }
             Object[] callargs = _build_callargs(frame, inliningTarget, self, argtypes, inargs, kwds, props,
                             pyTypeCheck, getArray, castToJavaIntExactNode, castToTruffleStringNode, pyTypeStgDictNode, callNode, getNameNode, equalNode);
             int inoutmask = props[pinoutmask_idx];

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/nodes/ErrorMessages.java

@@ -1279,6 +1279,7 @@ public abstract class ErrorMessages {
     public static final TruffleString OTHER_ARG_MUST_BE_KEY = tsLiteral("other argument must be K instance");
     public static final TruffleString INVALID_PARTIAL_STATE = tsLiteral("invalid partial state");
     public static final TruffleString LOST_S = tsLiteral("lost %s");
+    public static final TruffleString CTYPES_FUNCTION_CALL_COULD_NOT_OBTAIN_FUNCTION_POINTER = tsLiteral("ctypes function call could not obtain function pointer");
 
     // ssl error messages
     public static final TruffleString SSL_ERR_DECODING_PEM_FILE_S = tsLiteral("Error decoding PEM-encoded file: %s");