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env.dart
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// 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 dart2js.kernel.env;
import 'package:kernel/ast.dart' as ir;
import 'package:kernel/clone.dart';
import 'package:kernel/type_algebra.dart';
import '../common.dart';
import '../constants/constructors.dart';
import '../constants/expressions.dart';
import '../constants/values.dart';
import '../elements/entities.dart';
import '../elements/types.dart';
import '../ordered_typeset.dart';
import 'element_map.dart';
import 'element_map_impl.dart';
import 'element_map_mixins.dart';
/// Environment for fast lookup of program libraries.
class ProgramEnv {
final Set<ir.Program> _programs = new Set<ir.Program>();
Map<Uri, LibraryEnv> _libraryMap;
/// TODO(johnniwinther): Handle arbitrary load order if needed.
ir.Member get mainMethod => _programs.first?.mainMethod;
void addProgram(ir.Program program) {
if (_programs.add(program)) {
if (_libraryMap != null) {
_addLibraries(program);
}
}
}
void _addLibraries(ir.Program program) {
for (ir.Library library in program.libraries) {
_libraryMap[library.importUri] = new LibraryEnv(library);
}
}
void _ensureLibraryMap() {
if (_libraryMap == null) {
_libraryMap = <Uri, LibraryEnv>{};
for (ir.Program program in _programs) {
_addLibraries(program);
}
}
}
/// Return the [LibraryEnv] for the library with the canonical [uri].
LibraryEnv lookupLibrary(Uri uri) {
_ensureLibraryMap();
return _libraryMap[uri];
}
/// Calls [f] for each library in this environment.
void forEachLibrary(void f(LibraryEnv library)) {
_ensureLibraryMap();
_libraryMap.values.forEach(f);
}
/// Returns the number of libraries in this environment.
int get length {
_ensureLibraryMap();
return _libraryMap.length;
}
}
/// Environment for fast lookup of library classes and members.
class LibraryEnv {
final ir.Library library;
Map<String, ClassEnv> _classMap;
Map<String, ir.Member> _memberMap;
Map<String, ir.Member> _setterMap;
LibraryEnv(this.library);
void _ensureClassMap() {
if (_classMap == null) {
_classMap = <String, ClassEnv>{};
for (ir.Class cls in library.classes) {
_classMap[cls.name] = new ClassEnvImpl(cls);
}
}
}
/// Return the [ClassEnv] for the class [name] in [library].
ClassEnv lookupClass(String name) {
_ensureClassMap();
return _classMap[name];
}
/// Calls [f] for each class in this library.
void forEachClass(void f(ClassEnv cls)) {
_ensureClassMap();
_classMap.values.forEach(f);
}
void _ensureMemberMaps() {
if (_memberMap == null) {
_memberMap = <String, ir.Member>{};
_setterMap = <String, ir.Member>{};
for (ir.Member member in library.members) {
if (member.name.name.contains('#')) {
// Skip synthetic .dill members.
continue;
}
if (member is ir.Procedure) {
if (member.kind == ir.ProcedureKind.Setter) {
_setterMap[member.name.name] = member;
} else {
_memberMap[member.name.name] = member;
}
} else if (member is ir.Field) {
_memberMap[member.name.name] = member;
if (member.isMutable) {
_setterMap[member.name.name] = member;
}
} else {
failedAt(
NO_LOCATION_SPANNABLE, "Unexpected library member node: $member");
}
}
}
}
/// Return the [ir.Member] for the member [name] in [library].
ir.Member lookupMember(String name, {bool setter: false}) {
_ensureMemberMaps();
return setter ? _setterMap[name] : _memberMap[name];
}
void forEachMember(void f(ir.Member member)) {
_ensureMemberMaps();
_memberMap.values.forEach(f);
for (ir.Member member in _setterMap.values) {
if (member is ir.Procedure) {
f(member);
} else {
// Skip fields; these are also in _memberMap.
}
}
}
}
class LibraryData {
final ir.Library library;
Iterable<ConstantValue> _metadata;
LibraryData(this.library);
Iterable<ConstantValue> getMetadata(KernelToElementMapBase elementMap) {
return _metadata ??= elementMap.getMetadata(library.annotations);
}
LibraryData copy() {
return new LibraryData(library);
}
}
/// Member data for a class.
abstract class ClassEnv {
/// The [ir.Class] that defined the class, if any.
ir.Class get cls;
/// Whether the class is an unnamed mixin application.
bool get isUnnamedMixinApplication;
/// Return the [MemberEntity] for the member [name] in the class. If [setter]
/// is `true`, the setter or assignable field corresponding to [name] is
/// returned.
MemberEntity lookupMember(KernelToElementMap elementMap, String name,
{bool setter: false});
/// Calls [f] for each member of the class.
void forEachMember(
KernelToElementMap elementMap, void f(MemberEntity member));
/// Return the [ConstructorEntity] for the constructor [name] in the class.
ConstructorEntity lookupConstructor(
KernelToElementMap elementMap, String name);
/// Calls [f] for each constructor of the class.
void forEachConstructor(
KernelToElementMap elementMap, void f(ConstructorEntity constructor));
/// Calls [f] for each constructor body for the live constructors in the
/// class.
void forEachConstructorBody(void f(ConstructorBodyEntity constructor));
}
/// Environment for fast lookup of class members.
class ClassEnvImpl implements ClassEnv {
final ir.Class cls;
final bool isUnnamedMixinApplication;
Map<String, ir.Member> _constructorMap;
Map<String, ir.Member> _memberMap;
Map<String, ir.Member> _setterMap;
/// Constructor bodies created for this class.
List<ConstructorBodyEntity> _constructorBodyList;
ClassEnvImpl(this.cls)
// TODO(johnniwinther): Change this to use a property on [cls] when such
// is added to kernel.
: isUnnamedMixinApplication =
cls.name.contains('+') || cls.name.contains('&');
/// Copied from 'package:kernel/transformations/mixin_full_resolution.dart'.
ir.Constructor _buildForwardingConstructor(
CloneVisitor cloner, ir.Constructor superclassConstructor) {
var superFunction = superclassConstructor.function;
// We keep types and default values for the parameters but always mark the
// parameters as final (since we just forward them to the super
// constructor).
ir.VariableDeclaration cloneVariable(ir.VariableDeclaration variable) {
ir.VariableDeclaration clone = cloner.clone(variable);
clone.isFinal = true;
return clone;
}
// Build a [FunctionNode] which has the same parameters as the one in the
// superclass constructor.
var positionalParameters =
superFunction.positionalParameters.map(cloneVariable).toList();
var namedParameters =
superFunction.namedParameters.map(cloneVariable).toList();
var function = new ir.FunctionNode(new ir.EmptyStatement(),
positionalParameters: positionalParameters,
namedParameters: namedParameters,
requiredParameterCount: superFunction.requiredParameterCount,
returnType: const ir.VoidType());
// Build a [SuperInitializer] which takes all positional/named parameters
// and forward them to the super class constructor.
var positionalArguments = <ir.Expression>[];
for (var variable in positionalParameters) {
positionalArguments.add(new ir.VariableGet(variable));
}
var namedArguments = <ir.NamedExpression>[];
for (var variable in namedParameters) {
namedArguments.add(
new ir.NamedExpression(variable.name, new ir.VariableGet(variable)));
}
var superInitializer = new ir.SuperInitializer(superclassConstructor,
new ir.Arguments(positionalArguments, named: namedArguments));
// Assemble the constructor.
return new ir.Constructor(function,
name: superclassConstructor.name,
initializers: <ir.Initializer>[superInitializer]);
}
void _ensureMaps() {
if (_memberMap == null) {
_memberMap = <String, ir.Member>{};
_setterMap = <String, ir.Member>{};
_constructorMap = <String, ir.Member>{};
void addMembers(ir.Class c, {bool includeStatic}) {
for (ir.Member member in c.members) {
if (member.name.name.contains('#')) {
// Skip synthetic .dill members.
continue;
}
if (member is ir.Constructor ||
member is ir.Procedure &&
member.kind == ir.ProcedureKind.Factory) {
if (!includeStatic) continue;
_constructorMap[member.name.name] = member;
} else if (member is ir.Procedure) {
if (!includeStatic && member.isStatic) continue;
if (member.kind == ir.ProcedureKind.Setter) {
_setterMap[member.name.name] = member;
} else {
_memberMap[member.name.name] = member;
}
} else if (member is ir.Field) {
if (!includeStatic && member.isStatic) continue;
_memberMap[member.name.name] = member;
if (member.isMutable) {
_setterMap[member.name.name] = member;
}
_memberMap[member.name.name] = member;
} else {
failedAt(
NO_LOCATION_SPANNABLE, "Unexpected class member node: $member");
}
}
}
if (cls.mixedInClass != null) {
addMembers(cls.mixedInClass, includeStatic: false);
}
addMembers(cls, includeStatic: true);
if (isUnnamedMixinApplication && _constructorMap.isEmpty) {
// Unnamed mixin applications have no constructors when read from .dill.
// For each generative constructor in the superclass we make a
// corresponding forwarding constructor in the subclass.
//
// This code is copied from
// 'package:kernel/transformations/mixin_full_resolution.dart'
var superclassSubstitution = getSubstitutionMap(cls.supertype);
var superclassCloner =
new CloneVisitor(typeSubstitution: superclassSubstitution);
for (var superclassConstructor in cls.superclass.constructors) {
var forwardingConstructor = _buildForwardingConstructor(
superclassCloner, superclassConstructor);
cls.addMember(forwardingConstructor);
_constructorMap[forwardingConstructor.name.name] =
forwardingConstructor;
}
}
}
}
/// Return the [MemberEntity] for the member [name] in [cls]. If [setter] is
/// `true`, the setter or assignable field corresponding to [name] is
/// returned.
MemberEntity lookupMember(KernelToElementMap elementMap, String name,
{bool setter: false}) {
_ensureMaps();
ir.Member member = setter ? _setterMap[name] : _memberMap[name];
return member != null ? elementMap.getMember(member) : null;
}
/// Calls [f] for each member of [cls].
void forEachMember(
KernelToElementMap elementMap, void f(MemberEntity member)) {
_ensureMaps();
_memberMap.values.forEach((ir.Member member) {
f(elementMap.getMember(member));
});
for (ir.Member member in _setterMap.values) {
if (member is ir.Procedure) {
f(elementMap.getMember(member));
} else {
// Skip fields; these are also in _memberMap.
}
}
}
/// Return the [ConstructorEntity] for the constructor [name] in [cls].
ConstructorEntity lookupConstructor(
KernelToElementMap elementMap, String name) {
_ensureMaps();
ir.Member constructor = _constructorMap[name];
return constructor != null ? elementMap.getConstructor(constructor) : null;
}
/// Calls [f] for each constructor of [cls].
void forEachConstructor(
KernelToElementMap elementMap, void f(ConstructorEntity constructor)) {
_ensureMaps();
_constructorMap.values.forEach((ir.Member constructor) {
f(elementMap.getConstructor(constructor));
});
}
void addConstructorBody(ConstructorBodyEntity constructorBody) {
_constructorBodyList ??= <ConstructorBodyEntity>[];
_constructorBodyList.add(constructorBody);
}
void forEachConstructorBody(void f(ConstructorBodyEntity constructor)) {
_constructorBodyList?.forEach(f);
}
}
class ClosureClassEnv implements ClassEnv {
final Map<String, MemberEntity> _memberMap;
ClosureClassEnv(this._memberMap);
@override
void forEachConstructorBody(void f(ConstructorBodyEntity constructor)) {
// We do not create constructor bodies for closure classes.
}
@override
void forEachConstructor(
KernelToElementMap elementMap, void f(ConstructorEntity constructor)) {
// We do not create constructors for closure classes.
}
@override
ConstructorEntity lookupConstructor(
KernelToElementMap elementMap, String name) {
// We do not create constructors for closure classes.
return null;
}
@override
void forEachMember(
KernelToElementMap elementMap, void f(MemberEntity member)) {
_memberMap.values.forEach(f);
}
@override
MemberEntity lookupMember(KernelToElementMap elementMap, String name,
{bool setter: false}) {
if (setter) {
// All closure fields are final.
return null;
}
return _memberMap[name];
}
@override
bool get isUnnamedMixinApplication => false;
@override
ir.Class get cls => null;
}
class ClassData {
/// TODO(johnniwinther): Remove this from the [ClassData] interface. Use
/// `definition.node` instead.
final ir.Class cls;
final ClassDefinition definition;
bool isMixinApplication;
bool isCallTypeComputed = false;
InterfaceType thisType;
InterfaceType rawType;
InterfaceType supertype;
InterfaceType mixedInType;
List<InterfaceType> interfaces;
OrderedTypeSet orderedTypeSet;
DartType callType;
Iterable<ConstantValue> _metadata;
ClassData(this.cls, this.definition);
Iterable<ConstantValue> getMetadata(KernelToElementMapBase elementMap) {
return _metadata ??= elementMap.getMetadata(cls.annotations);
}
ClassData copy() {
return new ClassData(cls, definition);
}
}
abstract class MemberData {
MemberDefinition get definition;
Iterable<ConstantValue> getMetadata(KernelToElementMap elementMap);
}
class MemberDataImpl implements MemberData {
/// TODO(johnniwinther): Remove this from the [MemberData] interface. Use
/// `definition.node` instead.
final ir.Member node;
final MemberDefinition definition;
Iterable<ConstantValue> _metadata;
MemberDataImpl(this.node, this.definition);
Iterable<ConstantValue> getMetadata(
covariant KernelToElementMapBase elementMap) {
return _metadata ??= elementMap.getMetadata(node.annotations);
}
MemberData copy() {
return new MemberDataImpl(node, definition);
}
}
abstract class FunctionData implements MemberData {
FunctionType getFunctionType(KernelToElementMap elementMap);
void forEachParameter(KernelToElementMapForBuilding elementMap,
void f(DartType type, String name, ConstantValue defaultValue));
}
class FunctionDataImpl extends MemberDataImpl implements FunctionData {
final ir.FunctionNode functionNode;
FunctionType _type;
FunctionDataImpl(
ir.Member node, this.functionNode, MemberDefinition definition)
: super(node, definition);
FunctionType getFunctionType(covariant KernelToElementMapBase elementMap) {
return _type ??= elementMap.getFunctionType(functionNode);
}
void forEachParameter(KernelToElementMapForBuilding elementMap,
void f(DartType type, String name, ConstantValue defaultValue)) {
void handleParameter(ir.VariableDeclaration node, {bool isOptional: true}) {
DartType type = elementMap.getDartType(node.type);
String name = node.name;
ConstantValue defaultValue;
if (isOptional) {
if (node.initializer != null) {
defaultValue = elementMap.getConstantValue(node.initializer);
} else {
defaultValue = new NullConstantValue();
}
}
f(type, name, defaultValue);
}
for (int i = 0; i < functionNode.positionalParameters.length; i++) {
handleParameter(functionNode.positionalParameters[i],
isOptional: i < functionNode.requiredParameterCount);
}
functionNode.namedParameters.toList()
..sort(namedOrdering)
..forEach(handleParameter);
}
@override
FunctionData copy() {
return new FunctionDataImpl(node, functionNode, definition);
}
}
abstract class ConstructorData extends FunctionData {
ConstantConstructor getConstructorConstant(
KernelToElementMapBase elementMap, ConstructorEntity constructor);
}
class ConstructorDataImpl extends FunctionDataImpl implements ConstructorData {
ConstantConstructor _constantConstructor;
ConstructorBodyEntity constructorBody;
ConstructorDataImpl(
ir.Member node, ir.FunctionNode functionNode, MemberDefinition definition)
: super(node, functionNode, definition);
ConstantConstructor getConstructorConstant(
KernelToElementMapBase elementMap, ConstructorEntity constructor) {
if (_constantConstructor == null) {
if (node is ir.Constructor && constructor.isConst) {
_constantConstructor =
new Constantifier(elementMap).computeConstantConstructor(node);
} else {
failedAt(
constructor,
"Unexpected constructor $constructor in "
"ConstructorDataImpl._getConstructorConstant");
}
}
return _constantConstructor;
}
@override
ConstructorData copy() {
return new ConstructorDataImpl(node, functionNode, definition);
}
}
abstract class FieldData extends MemberData {
ConstantExpression getFieldConstant(
KernelToElementMapBase elementMap, FieldEntity field);
}
class FieldDataImpl extends MemberDataImpl implements FieldData {
ConstantExpression _constant;
FieldDataImpl(ir.Field node, MemberDefinition definition)
: super(node, definition);
ir.Field get node => super.node;
ConstantExpression getFieldConstant(
KernelToElementMapBase elementMap, FieldEntity field) {
if (_constant == null) {
if (node.isConst) {
_constant = new Constantifier(elementMap).visit(node.initializer);
} else {
failedAt(
field,
"Unexpected field $field in "
"FieldDataImpl.getFieldConstant");
}
}
return _constant;
}
@override
FieldData copy() {
return new FieldDataImpl(node, definition);
}
}
class TypedefData {
final ir.Typedef node;
final TypedefEntity element;
final TypedefType rawType;
TypedefData(this.node, this.element, this.rawType);
}