Move MessageWriter from snapshot files to dart_api_message files

runtime/vm/dart_api_message.cc

Index: runtime/vm/dart_api_message.cc
diff --git a/runtime/vm/dart_api_message.cc b/runtime/vm/dart_api_message.cc
index 9f3bcec9b43e7952cfabb9e12af360cfe4dc2d1e..8ea8b416870c019df1b5486a93abe83cae3c7ff7 100644
--- a/runtime/vm/dart_api_message.cc
+++ b/runtime/vm/dart_api_message.cc
@@ -328,4 +328,216 @@ void ApiMessageReader::AddBackwardReference(intptr_t id, Dart_CObject* obj) {
   backward_references_.Add(obj);
 }
 
+void ApiMessageWriter::WriteMessage(intptr_t field_count, intptr_t *data) {
+  // Write out the serialization header value for this object.
+  WriteSerializationMarker(kInlined, kMaxPredefinedObjectIds);
+
+  // Write out the class and tags information.
+  WriteObjectHeader(ObjectStore::kArrayClass, 0);
+
+  // Write out the length field.
+  Write<RawObject*>(Smi::New(field_count));
+
+  // Write out the type arguments.
+  WriteIndexedObject(Object::kNullObject);
+
+  // Write out the individual Smis.
+  for (int i = 0; i < field_count; i++) {
+    Write<RawObject*>(Integer::New(data[i]));
+  }
+
+  FinalizeBuffer();
+}
+
+
+void ApiMessageWriter::MarkCObject(Dart_CObject* object, intptr_t object_id) {
+  // Mark the object as serialized by adding the object id to the
+  // upper bits of the type field in the Dart_CObject structure. Add
+  // an offset for making marking of object id 0 possible.
+  ASSERT(!IsCObjectMarked(object));
+  intptr_t mark_value = object_id + kDartCObjectMarkOffset;
+  object->type = static_cast<Dart_CObject::Type>(
+      ((mark_value) << kDartCObjectTypeBits) | object->type);
+}
+
+
+void ApiMessageWriter::UnmarkCObject(Dart_CObject* object) {
+  ASSERT(IsCObjectMarked(object));
+  object->type = static_cast<Dart_CObject::Type>(
+      object->type & kDartCObjectTypeMask);
+}
+
+
+bool ApiMessageWriter::IsCObjectMarked(Dart_CObject* object) {
+  return (object->type & kDartCObjectMarkMask) != 0;
+}
+
+
+intptr_t ApiMessageWriter::GetMarkedCObjectMark(Dart_CObject* object) {
+  ASSERT(IsCObjectMarked(object));
+  intptr_t mark_value = ((object->type & kDartCObjectMarkMask) >> 3);
+  // An offset was added to object id for making marking object id 0 possible.
+  return mark_value - kDartCObjectMarkOffset;
+}
+
+
+void ApiMessageWriter::UnmarkAllCObjects(Dart_CObject* object) {
+  if (!IsCObjectMarked(object)) return;
+  UnmarkCObject(object);
+  if (object->type == Dart_CObject::kArray) {
+    for (int i = 0; i < object->value.as_array.length; i++) {
+      Dart_CObject* element = object->value.as_array.values[i];
+      UnmarkAllCObjects(element);
+    }
+  }
+}
+
+
+void ApiMessageWriter::WriteSmi(int64_t value) {
+  ASSERT(Smi::IsValid64(value));
+  Write<RawObject*>(Smi::New(value));
+}
+
+
+void ApiMessageWriter::WriteMint(Dart_CObject* object, int64_t value) {
+  ASSERT(!Smi::IsValid64(value));
+  // Write out the serialization header value for mint object.
+  WriteInlinedHeader(object);
+  // Write out the class and tags information.
+  WriteObjectHeader(ObjectStore::kMintClass, 0);
+  // Write the 64-bit value.
+  Write<int64_t>(value);
+}
+
+
+void ApiMessageWriter::WriteInt32(Dart_CObject* object) {
+  int64_t value = object->value.as_int32;
+  if (Smi::IsValid64(value)) {
+    WriteSmi(value);
+  } else {
+    WriteMint(object, value);
+  }
+}
+
+
+void ApiMessageWriter::WriteInt64(Dart_CObject* object) {
+  int64_t value = object->value.as_int64;
+  if (Smi::IsValid64(value)) {
+    WriteSmi(value);
+  } else {
+    WriteMint(object, value);
+  }
+}
+
+
+void ApiMessageWriter::WriteInlinedHeader(Dart_CObject* object) {
+  // Write out the serialization header value for this object.
+  WriteSerializationMarker(kInlined, kMaxPredefinedObjectIds + object_id_);
+  // Mark object with its object id.
+  MarkCObject(object, object_id_);
+  // Advance object id.
+  object_id_++;
+}
+
+
+void ApiMessageWriter::WriteCObject(Dart_CObject* object) {
+  if (IsCObjectMarked(object)) {
+    intptr_t object_id = GetMarkedCObjectMark(object);
+    WriteIndexedObject(kMaxPredefinedObjectIds + object_id);
+    return;
+  }
+
+  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:
+      WriteInt32(object);
+      break;
+    case Dart_CObject::kInt64:
+      WriteInt64(object);
+      break;
+    case Dart_CObject::kBigint: {
+      // Write out the serialization header value for this object.
+      WriteInlinedHeader(object);
+      // Write out the class and tags information.
+      WriteObjectHeader(ObjectStore::kBigintClass, 0);
+      // Write hex string length and content
+      char* hex_string = object->value.as_bigint;
+      intptr_t len = strlen(hex_string);
+      WriteIntptrValue(len);
+      for (intptr_t i = 0; i < len; i++) {
+        Write<uint8_t>(hex_string[i]);
+      }
+      break;
+    }
+    case Dart_CObject::kDouble:
+      // Write out the serialization header value for this object.
+      WriteInlinedHeader(object);
+      // Write out the class and tags information.
+      WriteObjectHeader(ObjectStore::kDoubleClass, 0);
+      // Write double value.
+      Write<double>(object->value.as_double);
+      break;
+    case Dart_CObject::kString: {
+      // Write out the serialization header value for this object.
+      WriteInlinedHeader(object);
+      // Write out the class and tags information.
+      WriteObjectHeader(ObjectStore::kOneByteStringClass, 0);
+      // Write string length, hash and content
+      char* str = object->value.as_string;
+      intptr_t len = strlen(str);
+      WriteSmi(len);
+      WriteSmi(0);  // TODO(sgjesse): 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.
+      WriteInlinedHeader(object);
+      // 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);
+      // Write out array elements.
+      for (int i = 0; i < object->value.as_array.length; i++) {
+        WriteCObject(object->value.as_array.values[i]);
+      }
+      break;
+    }
+    case Dart_CObject::kByteArray: {
+      // Write out the serialization header value for this object.
+      WriteInlinedHeader(object);
+      // Write out the class and tags information.
+      WriteObjectHeader(ObjectStore::kInternalByteArrayClass, 0);
+      uint8_t* bytes = object->value.as_byte_array.values;
+      intptr_t len = object->value.as_byte_array.length;
+      WriteSmi(len);
+      for (intptr_t i = 0; i < len; i++) {
+        Write<uint8_t>(bytes[i]);
+      }
+      break;
+    }
+    default:
+      UNREACHABLE();
+  }
+}
+
+
+void ApiMessageWriter::WriteCMessage(Dart_CObject* object) {
+  WriteCObject(object);
+  UnmarkAllCObjects(object);
+  FinalizeBuffer();
+}
+
 }  // namespace dart