blob: 2dc607d1b72d6fbd3ac701c9f6273618e48fac6e [file] [log] [blame]
// Copyright (c) 2017, 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 vm.constants_native_effects;
import '../ast.dart';
import '../target/targets.dart';
import '../core_types.dart';
class VmConstantsBackend extends ConstantsBackend {
final Class immutableMapClass;
/// If [defines] is not `null` it will be used for handling
/// `const {bool,...}.fromEnvironment()` otherwise the current VM's values
/// will be used.
factory VmConstantsBackend(CoreTypes coreTypes) {
final Library coreLibrary = coreTypes.coreLibrary;
final Class immutableMapClass = coreLibrary.classes
.firstWhere((Class klass) => == '_ImmutableMap');
assert(immutableMapClass != null);
return new VmConstantsBackend._(immutableMapClass);
Constant lowerMapConstant(MapConstant constant) {
// The _ImmutableMap class is implemented via one field pointing to a list
// of key/value pairs -- see runtime/lib/immutable_map.dart!
final List<Constant> kvListPairs =
new List<Constant>(2 * constant.entries.length);
for (int i = 0; i < constant.entries.length; i++) {
final ConstantMapEntry entry = constant.entries[i];
kvListPairs[2 * i] = entry.key;
kvListPairs[2 * i + 1] = entry.value;
// This is a bit fishy, since we merge the key and the value type by
// putting both into the same list.
final kvListConstant = new ListConstant(const DynamicType(), kvListPairs);
assert(immutableMapClass.fields.length == 1);
final Field kvPairListField = immutableMapClass.fields[0];
return new InstanceConstant(immutableMapClass.reference, <DartType>[
], <Reference, Constant>{
kvPairListField.reference: kvListConstant,