Add Dart_GetNativeFieldsOfArgument to get all the native fields of a dart

runtime/vm/dart_api_impl.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "include/dart_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 
 #include "platform/assert.h"
 #include "vm/bigint_operations.h"
@@ skipping 3761 matching lines @@
   DARTSCOPE(isolate);
   const Instance& instance = Api::UnwrapInstanceHandle(isolate, obj);
   if (instance.IsNull()) {
     RETURN_TYPE_ERROR(isolate, obj, Instance);
   }
   if (!instance.IsValidNativeIndex(index)) {
     return Api::NewError(
         "%s: invalid index %d passed in to access native instance field",
         CURRENT_FUNC, index);
   }
-  *value = instance.GetNativeField(isolate, index);
+  *value = instance.GetNativeField(index);
   return Api::Success();
 }
 
 
 DART_EXPORT Dart_Handle Dart_SetNativeInstanceField(Dart_Handle obj,
                                                     int index,
                                                     intptr_t value) {
   Isolate* isolate = Isolate::Current();
   DARTSCOPE(isolate);
   const Instance& instance = Api::UnwrapInstanceHandle(isolate, obj);
@@ skipping 31 matching lines @@
 }
 
 
 DART_EXPORT int Dart_GetNativeArgumentCount(Dart_NativeArguments args) {
   TRACE_API_CALL(CURRENT_FUNC);
   NativeArguments* arguments = reinterpret_cast<NativeArguments*>(args);
   return arguments->NativeArgCount();
 }
 
 
-DART_EXPORT Dart_Handle Dart_GetNativeFieldOfArgument(Dart_NativeArguments args,
-                                                      int arg_index,
-                                                      int fld_index,
-                                                      intptr_t* value) {
+DART_EXPORT Dart_Handle Dart_GetNativeFieldsOfArgument(
+    Dart_NativeArguments args,
+    int arg_index,
+    int num_fields,
+    intptr_t* field_values) {
   NativeArguments* arguments = reinterpret_cast<NativeArguments*>(args);
   if ((arg_index < 0) || (arg_index >= arguments->NativeArgCount())) {
     return Api::NewError(
         "%s: argument 'arg_index' out of range. Expected 0..%d but saw %d.",
         CURRENT_FUNC, arguments->NativeArgCount() - 1, arg_index);
   }
+  if (field_values == NULL) {
+    RETURN_NULL_ERROR(field_values);
+  }
   Isolate* isolate = arguments->isolate();
   DARTSCOPE(isolate);
-  const Object& obj = Object::Handle(isolate,
-                                     arguments->NativeArgAt(arg_index));
+  ReusableObjectHandleScope reused_obj_handle(isolate);
+  Object& obj = reused_obj_handle.Handle();
+  obj = arguments->NativeArgAt(arg_index);
+  if (obj.IsNull()) {
+    for (intptr_t i = 0; i < num_fields; i++) {
+      field_values[i] = 0;
+    }
+    return Api::Success();
+  }
   if (!obj.IsInstance()) {
     return Api::NewError("%s expects argument at index '%d' to be of"
                          " type Instance.", CURRENT_FUNC, arg_index);
   }
-  if (obj.IsNull()) {
-    return Api::NewError("%s expects argument at index '%d' to be non-null.",
-                         CURRENT_FUNC, arg_index);
+  const Instance& instance = Instance::Cast(obj);
+  uint16_t field_count = instance.NumNativeFields();
+  if (num_fields != field_count) {
+    return Api::NewError(
+        "%s: invalid 'field_values' array specified for returning field values",
+        CURRENT_FUNC);
   }
-  const Instance& instance = Instance::Cast(obj);
-  if (!instance.IsValidNativeIndex(fld_index)) {
-    return Api::NewError(
-        "%s: invalid index %d passed in to access native instance field",
-        CURRENT_FUNC, fld_index);
-  }
-  if (value == NULL) {
-    RETURN_NULL_ERROR(value);
-  }
-  *value = instance.GetNativeField(isolate, fld_index);
+  instance.GetNativeFields(num_fields, field_values);
   return Api::Success();
 }
 
 
 DART_EXPORT Dart_Handle Dart_GetNativeReceiver(Dart_NativeArguments args,
                                                intptr_t* value) {
   NativeArguments* arguments = reinterpret_cast<NativeArguments*>(args);
   Isolate* isolate = arguments->isolate();
   CHECK_ISOLATE(isolate);
   if (value == NULL) {
@@ skipping 694 matching lines @@
 
 
 DART_EXPORT void Dart_RegisterRootServiceRequestCallback(
     const char* name,
     Dart_ServiceRequestCallback callback,
     void* user_data) {
   Service::RegisterRootEmbedderCallback(name, callback, user_data);
 }
 
 }  // namespace dart