Added API Dart_PostCMessage for posting a Dart_CMessage structure

runtime/vm/snapshot.cc

Index: runtime/vm/snapshot.cc
diff --git a/runtime/vm/snapshot.cc b/runtime/vm/snapshot.cc
index d0317a1b3f0c862487559174bf2129029e38f9ec..6c47349e0dfe3a3238811bf0d14857bdf568ec05 100644
--- a/runtime/vm/snapshot.cc
+++ b/runtime/vm/snapshot.cc
@@ -725,6 +725,75 @@ void MessageWriter::WriteMessage(intptr_t field_count, intptr_t *data) {
 }
 
 
+void MessageWriter::WriteSmi(int32_t value) {
+  Write<RawObject*>(Smi::New(value));
+}
+
+
+void MessageWriter::WriteCObject(Dart_CObject* object) {
+  switch (object->type) {
+    case Dart_CObject::kNull:
+      WriteIndexedObject(Object::kNullObject);
+      break;
+    case Dart_CObject::kBool:
+      if (object->value.as_bool) {
+        WriteIndexedObject(ObjectStore::kTrueValue);
+      } else {
+        WriteIndexedObject(ObjectStore::kFalseValue);
+      }
+      break;
+    case Dart_CObject::kInt32: {
+      WriteSmi(object->value.as_int32);
+      break;
+    }
+    case Dart_CObject::kDouble:
+      // Write out the serialization header value for this object.
+      WriteSerializationMarker(kInlined, kMaxPredefinedObjectIds + object_id_);
+      object_id_++;
+      // Write out the class and tags information.
+      WriteObjectHeader(ObjectStore::kDoubleClass, 0);
+      Write<double>(object->value.as_double);
+      break;
+    case Dart_CObject::kString: {
+      // Write out the serialization header value for this object.
+      WriteSerializationMarker(kInlined, kMaxPredefinedObjectIds + object_id_);
+      object_id_++;
+      char* str = object->value.as_string;
+      intptr_t len = strlen(str);
+      // Write out the class and tags information.
+      WriteObjectHeader(ObjectStore::kOneByteStringClass, 0);
+      WriteSmi(len);
+      WriteSmi(0);  // Hash - not written.
+      for (intptr_t i = 0; i < len; i++) {
+        Write<uint8_t>(str[i]);
+      }
+      break;
+    }
+    case Dart_CObject::kArray:
+      // Write out the serialization header value for this object.
+      WriteSerializationMarker(kInlined, kMaxPredefinedObjectIds + object_id_);
+      object_id_++;
+      // Write out the class and tags information.
+      WriteObjectHeader(ObjectStore::kArrayClass, 0);
+      WriteSmi(object->value.as_array.length);
+      // Write out the type arguments.
+      WriteIndexedObject(Object::kNullObject);
+      for (int i = 0; i < object->value.as_array.length; i++) {
+        WriteCObject(object->value.as_array.values[i]);
+      }
+      break;
+    default:
+      UNREACHABLE();
+  }
+}
+
+
+void MessageWriter::WriteCMessage(Dart_CObject* object) {
+  WriteCObject(object);
+  FinalizeBuffer();
+}
+
+
 void SnapshotWriter::WriteObject(RawObject* rawobj) {
   // An object is written in one of the following ways:
   // - Smi: the Smi value is written as is (last bit is not tagged).