blob: 5e5762e541181be0e2628d05a9c4c8408388d90c [file] [log] [blame]
// Copyright (c) 2018, 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.
library kernel.external_name;
import 'ast.dart';
import 'core_types.dart';
/// Returns external (native) name of given [Member].
String? getExternalName(CoreTypes coreTypes, Member procedure) {
// Native procedures are marked as external and have an annotation,
// which looks like this:
//
// @pragma("vm:external-name", "<name-of-native>")
// external Object foo(arg0, ...);
//
if (!procedure.isExternal) {
return null;
}
for (final Expression annotation in procedure.annotations) {
final String? value = _getExternalNameValue(coreTypes, annotation);
if (value != null) {
return value;
}
}
return null;
}
String? _getExternalNameValue(CoreTypes coreTypes, Expression annotation) {
if (annotation is ConstantExpression) {
final Constant constant = annotation.constant;
if (constant is InstanceConstant) {
if (_isPragma(constant.classNode)) {
final String pragmaName =
(constant.fieldValues[coreTypes.pragmaName.fieldReference]
as StringConstant)
.value;
final Constant? pragmaOptionsValue =
constant.fieldValues[coreTypes.pragmaOptions.fieldReference];
final String? pragmaOptions = pragmaOptionsValue is StringConstant
? pragmaOptionsValue.value
: null;
if (pragmaName == _externalNamePragma && pragmaOptions != null) {
return pragmaOptions;
}
}
}
}
return null;
}
bool _isPragma(Class klass) =>
klass.name == 'pragma' &&
klass.enclosingLibrary.importUri.toString() == 'dart:core';
const String _externalNamePragma = 'vm:external-name';