Decode the Dart message into a Dart_CMessage structure before calling the native port callback

runtime/vm/dart_api_message.h

Index: runtime/vm/dart_api_message.h
diff --git a/runtime/vm/dart_api_message.h b/runtime/vm/dart_api_message.h
new file mode 100644
index 0000000000000000000000000000000000000000..b53082a55638ba5fef57e884c1f5d5575d44489e
--- /dev/null
+++ b/runtime/vm/dart_api_message.h
@@ -0,0 +1,67 @@
+// Copyright (c) 2012, 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_MESSAGE_H_
+#define VM_DART_API_MESSAGE_H_
+
+#include "vm/dart_api_state.h"
+#include "vm/snapshot.h"
+
+namespace dart {
+
+// Reads a message snapshot into a C structure.
+class ApiMessageReader : public BaseReader {
+ public:
+  ApiMessageReader(const uint8_t* buffer, intptr_t length, ReAlloc alloc);
+  ~ApiMessageReader() { }
+
+  Dart_CObject* ReadMessage();
+
+ private:
+  // Allocates a Dart_CObject object.
+  Dart_CObject* AllocateDartCObject();
+  // Allocates a Dart_CObject object with the specified type.
+  Dart_CObject* AllocateDartCObject(Dart_CObject::Type type);
+  // Allocates a Dart_CObject object for the null object.
+  Dart_CObject* AllocateDartCObjectNull();
+  // Allocates a Dart_CObject object for a boolean object.
+  Dart_CObject* AllocateDartCObjectBool(bool value);
+  // Allocates a Dart_CObject object for for a 32-bit integer.
+  Dart_CObject* AllocateDartCObjectInt32(int32_t value);
+  // Allocates a Dart_CObject object for a double.
+  Dart_CObject* AllocateDartCObjectDouble(double value);
+  // Allocates a Dart_CObject object for string data.
+  Dart_CObject* AllocateDartCObjectString(intptr_t length);
+  // Allocates a C array of Dart_CObject objects.
+  Dart_CObject* AllocateDartCObjectArray(intptr_t length);
+
+  void Init();
+
+  intptr_t LookupInternalClass(intptr_t class_header);
+  Dart_CObject* ReadInlinedObject(intptr_t object_id);
+  Dart_CObject* ReadObjectImpl(intptr_t header);
+  Dart_CObject* ReadIndexedObject(intptr_t object_id);
+  Dart_CObject* ReadObject();
+
+  // Add object to backward references.
+  void AddBackwardReference(intptr_t id, Dart_CObject* obj);
+
+  Dart_CObject_Internal* AsInternal(Dart_CObject* object) {

[siva, 2012/02/09 00:45:29]

Looks like Dart_CObject_Internal is still defined in snapshot.h

Can that be moved here too?

[Søren Gjesse, 2012/02/09 08:44:01]

Done.

+    ASSERT(object->type >= Dart_CObject::kNumberOfTypes);
+    return reinterpret_cast<Dart_CObject_Internal*>(object);
+  }
+
+  // Allocation of the structures for the decoded message happens
+  // either in the supplied zone or using the supplied allocation
+  // function.
+  ReAlloc alloc_;
+  ApiGrowableArray<Dart_CObject*> backward_references_;
+
+  Dart_CObject type_arguments_marker;
+  Dart_CObject dynamic_type_marker;
+};
+
+}  // namespace dart
+
+#endif  // VM_DART_API_MESSAGE_H_