Split dart_api.h into multiple parts:

runtime/vm/dart_api_impl.h

 // Copyright (c) 2011, 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.
 
 #ifndef VM_DART_API_IMPL_H_
 #define VM_DART_API_IMPL_H_
 
 #include "vm/allocation.h"
 #include "vm/object.h"
 
@@ skipping 40 matching lines @@
            "Dart_EnterScope?", CURRENT_FUNC);                                  \
     }                                                                          \
   } while (0)
 
 #define DARTSCOPE(isolate)                                                     \
   Isolate* __temp_isolate__ = (isolate);                                       \
   CHECK_ISOLATE_SCOPE(__temp_isolate__);                                       \
   HANDLESCOPE(__temp_isolate__);
 
 
+#define RETURN_TYPE_ERROR(isolate, dart_handle, type)                          \
+  do {                                                                         \
+    const Object& tmp =                                                        \
+        Object::Handle(isolate, Api::UnwrapHandle((dart_handle)));             \
+    if (tmp.IsNull()) {                                                        \
+      return Api::NewError("%s expects argument '%s' to be non-null.",         \
+                           CURRENT_FUNC, #dart_handle);                        \
+    } else if (tmp.IsError()) {                                                \
+      return dart_handle;                                                      \
+    } else {                                                                   \
+      return Api::NewError("%s expects argument '%s' to be of type %s.",       \
+                           CURRENT_FUNC, #dart_handle, #type);                 \
+    }                                                                          \
+  } while (0)
+
+
+#define RETURN_NULL_ERROR(parameter)                                           \
+  return Api::NewError("%s expects argument '%s' to be non-null.",             \
+                       CURRENT_FUNC, #parameter);
+
+
+#define CHECK_LENGTH(length, max_elements)                                     \
+  do {                                                                         \
+    intptr_t len = (length);                                                   \
+    intptr_t max = (max_elements);                                             \
+    if (len < 0 || len > max) {                                                \
+      return Api::NewError(                                                    \
+          "%s expects argument '%s' to be in the range [0..%"Pd"].",           \
+          CURRENT_FUNC, #length, max);                                         \
+    }                                                                          \
+  } while (0)
+
+
 class Api : AllStatic {
  public:
   // Creates a new local handle.
   static Dart_Handle NewHandle(Isolate* isolate, RawObject* raw);
 
   // Unwraps the raw object from the handle.
   static RawObject* UnwrapHandle(Dart_Handle object);
 
   // Unwraps a raw Type from the handle.  The handle will be null if
   // the object was not of the requested Type.
@@ skipping 117 matching lines @@
   isolate->DecrementNoCallbackScopeDepth()
 
 #define CHECK_CALLBACK_STATE(isolate)                                          \
   if (isolate->no_callback_scope_depth() != 0) {                               \
     return reinterpret_cast<Dart_Handle>(Api::AcquiredError(isolate));         \
   }                                                                            \
 
 }  // namespace dart.
 
 #endif  // VM_DART_API_IMPL_H_