mirror of
https://github.com/dart-lang/sdk
synced 2024-09-16 02:37:53 +00:00
ff0c3936a1
This reverts commit fd4a0c658f
.
443 lines
13 KiB
Dart
443 lines
13 KiB
Dart
// Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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library kernel.clone;
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import 'ast.dart';
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import 'type_algebra.dart';
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/// Visitor that return a clone of a tree, maintaining references to cloned
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/// objects.
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///
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/// It is safe to clone members, but cloning a class or library is not
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/// supported.
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class CloneVisitor extends TreeVisitor {
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final Map<VariableDeclaration, VariableDeclaration> variables =
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<VariableDeclaration, VariableDeclaration>{};
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final Map<LabeledStatement, LabeledStatement> labels =
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<LabeledStatement, LabeledStatement>{};
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final Map<SwitchCase, SwitchCase> switchCases = <SwitchCase, SwitchCase>{};
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final Map<TypeParameter, DartType> typeSubstitution;
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CloneVisitor({Map<TypeParameter, DartType> typeSubstitution})
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: this.typeSubstitution = ensureMutable(typeSubstitution);
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static Map<TypeParameter, DartType> ensureMutable(
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Map<TypeParameter, DartType> map) {
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// We need to mutate this map, so make sure we don't use a constant map.
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if (map == null || map.isEmpty) {
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return <TypeParameter, DartType>{};
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}
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return map;
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}
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TreeNode visitLibrary(Library node) {
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throw 'Cloning of libraries is not implemented';
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}
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TreeNode visitClass(Class node) {
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throw 'Cloning of classes is not implemented';
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}
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TreeNode clone(TreeNode node) =>
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node.accept(this)..fileOffset = node.fileOffset;
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TreeNode cloneOptional(TreeNode node) {
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TreeNode result = node?.accept(this);
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if (result != null) result.fileOffset = node.fileOffset;
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return result;
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}
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DartType visitType(DartType type) {
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return substitute(type, typeSubstitution);
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}
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DartType visitOptionalType(DartType type) {
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return type == null ? null : substitute(type, typeSubstitution);
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}
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visitInvalidExpression(InvalidExpression node) => new InvalidExpression();
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visitVariableGet(VariableGet node) {
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return new VariableGet(
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variables[node.variable], visitOptionalType(node.promotedType));
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}
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visitVariableSet(VariableSet node) {
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return new VariableSet(variables[node.variable], clone(node.value));
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}
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visitPropertyGet(PropertyGet node) {
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return new PropertyGet.byReference(
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clone(node.receiver), node.name, node.interfaceTargetReference);
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}
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visitPropertySet(PropertySet node) {
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return new PropertySet.byReference(clone(node.receiver), node.name,
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clone(node.value), node.interfaceTargetReference);
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}
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visitDirectPropertyGet(DirectPropertyGet node) {
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return new DirectPropertyGet.byReference(
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clone(node.receiver), node.targetReference);
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}
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visitDirectPropertySet(DirectPropertySet node) {
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return new DirectPropertySet.byReference(
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clone(node.receiver), node.targetReference, clone(node.value));
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}
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visitSuperPropertyGet(SuperPropertyGet node) {
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return new SuperPropertyGet.byReference(
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node.name, node.interfaceTargetReference);
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}
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visitSuperPropertySet(SuperPropertySet node) {
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return new SuperPropertySet.byReference(
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node.name, clone(node.value), node.interfaceTargetReference);
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}
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visitStaticGet(StaticGet node) {
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return new StaticGet.byReference(node.targetReference);
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}
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visitStaticSet(StaticSet node) {
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return new StaticSet.byReference(node.targetReference, clone(node.value));
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}
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visitMethodInvocation(MethodInvocation node) {
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return new MethodInvocation.byReference(clone(node.receiver), node.name,
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clone(node.arguments), node.interfaceTargetReference);
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}
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visitDirectMethodInvocation(DirectMethodInvocation node) {
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return new DirectMethodInvocation.byReference(
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clone(node.receiver), node.targetReference, clone(node.arguments));
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}
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visitSuperMethodInvocation(SuperMethodInvocation node) {
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return new SuperMethodInvocation.byReference(
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node.name, clone(node.arguments), node.interfaceTargetReference);
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}
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visitStaticInvocation(StaticInvocation node) {
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return new StaticInvocation.byReference(
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node.targetReference, clone(node.arguments),
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isConst: node.isConst);
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}
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visitConstructorInvocation(ConstructorInvocation node) {
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return new ConstructorInvocation.byReference(
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node.targetReference, clone(node.arguments),
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isConst: node.isConst);
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}
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visitNot(Not node) {
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return new Not(clone(node.operand));
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}
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visitLogicalExpression(LogicalExpression node) {
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return new LogicalExpression(
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clone(node.left), node.operator, clone(node.right));
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}
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visitConditionalExpression(ConditionalExpression node) {
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return new ConditionalExpression(clone(node.condition), clone(node.then),
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clone(node.otherwise), visitOptionalType(node.staticType));
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}
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visitStringConcatenation(StringConcatenation node) {
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return new StringConcatenation(node.expressions.map(clone).toList());
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}
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visitIsExpression(IsExpression node) {
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return new IsExpression(clone(node.operand), visitType(node.type));
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}
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visitAsExpression(AsExpression node) {
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return new AsExpression(clone(node.operand), visitType(node.type));
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}
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visitSymbolLiteral(SymbolLiteral node) {
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return new SymbolLiteral(node.value);
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}
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visitTypeLiteral(TypeLiteral node) {
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return new TypeLiteral(visitType(node.type));
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}
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visitThisExpression(ThisExpression node) {
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return new ThisExpression();
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}
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visitRethrow(Rethrow node) {
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return new Rethrow();
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}
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visitThrow(Throw node) {
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return new Throw(cloneOptional(node.expression));
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}
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visitListLiteral(ListLiteral node) {
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return new ListLiteral(node.expressions.map(clone).toList(),
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typeArgument: visitType(node.typeArgument), isConst: node.isConst);
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}
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visitMapLiteral(MapLiteral node) {
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return new MapLiteral(node.entries.map(clone).toList(),
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keyType: visitType(node.keyType),
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valueType: visitType(node.valueType),
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isConst: node.isConst);
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}
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visitMapEntry(MapEntry node) {
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return new MapEntry(clone(node.key), clone(node.value));
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}
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visitAwaitExpression(AwaitExpression node) {
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return new AwaitExpression(clone(node.operand));
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}
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visitFunctionExpression(FunctionExpression node) {
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return new FunctionExpression(clone(node.function));
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}
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visitStringLiteral(StringLiteral node) {
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return new StringLiteral(node.value);
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}
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visitIntLiteral(IntLiteral node) {
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return new IntLiteral(node.value);
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}
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visitDoubleLiteral(DoubleLiteral node) {
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return new DoubleLiteral(node.value);
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}
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visitBoolLiteral(BoolLiteral node) {
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return new BoolLiteral(node.value);
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}
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visitNullLiteral(NullLiteral node) {
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return new NullLiteral();
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}
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visitLet(Let node) {
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var newVariable = clone(node.variable);
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return new Let(newVariable, clone(node.body));
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}
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visitVectorCreation(VectorCreation node) {
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return new VectorCreation(node.length);
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}
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visitClosureCreation(ClosureCreation node) {
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return new ClosureCreation.byReference(
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node.topLevelFunctionReference,
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cloneOptional(node.contextVector),
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visitOptionalType(node.functionType),
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node.typeArguments.map(visitType).toList());
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}
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visitVectorSet(VectorSet node) {
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return new VectorSet(
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clone(node.vectorExpression), node.index, clone(node.value));
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}
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visitVectorGet(VectorGet node) {
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return new VectorGet(clone(node.vectorExpression), node.index);
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}
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visitVectorCopy(VectorCopy node) {
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return new VectorCopy(clone(node.vectorExpression));
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}
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// Statements
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visitInvalidStatement(InvalidStatement node) {
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return new InvalidStatement();
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}
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visitExpressionStatement(ExpressionStatement node) {
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return new ExpressionStatement(clone(node.expression));
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}
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visitBlock(Block node) {
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return new Block(node.statements.map(clone).toList());
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}
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visitEmptyStatement(EmptyStatement node) {
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return new EmptyStatement();
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}
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visitAssertStatement(AssertStatement node) {
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return new AssertStatement(clone(node.condition),
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conditionStartOffset: node.conditionStartOffset,
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conditionEndOffset: node.conditionEndOffset,
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message: cloneOptional(node.message));
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}
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visitLabeledStatement(LabeledStatement node) {
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LabeledStatement newNode = new LabeledStatement(null);
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labels[node] = newNode;
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newNode.body = clone(node.body)..parent = newNode;
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return newNode;
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}
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visitBreakStatement(BreakStatement node) {
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return new BreakStatement(labels[node.target]);
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}
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visitWhileStatement(WhileStatement node) {
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return new WhileStatement(clone(node.condition), clone(node.body));
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}
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visitDoStatement(DoStatement node) {
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return new DoStatement(clone(node.body), clone(node.condition));
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}
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visitForStatement(ForStatement node) {
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var variables = node.variables.map(clone).toList();
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return new ForStatement(variables, cloneOptional(node.condition),
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node.updates.map(clone).toList(), clone(node.body));
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}
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visitForInStatement(ForInStatement node) {
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var newVariable = clone(node.variable);
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return new ForInStatement(
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newVariable, clone(node.iterable), clone(node.body));
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}
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visitSwitchStatement(SwitchStatement node) {
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for (SwitchCase switchCase in node.cases) {
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switchCases[switchCase] = new SwitchCase(
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switchCase.expressions.map(clone).toList(),
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new List<int>.from(switchCase.expressionOffsets),
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null);
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}
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return new SwitchStatement(
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clone(node.expression), node.cases.map(clone).toList());
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}
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visitSwitchCase(SwitchCase node) {
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var switchCase = switchCases[node];
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switchCase.body = clone(node.body)..parent = switchCase;
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return switchCase;
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}
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visitContinueSwitchStatement(ContinueSwitchStatement node) {
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return new ContinueSwitchStatement(switchCases[node.target]);
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}
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visitIfStatement(IfStatement node) {
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return new IfStatement(
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clone(node.condition), clone(node.then), cloneOptional(node.otherwise));
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}
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visitReturnStatement(ReturnStatement node) {
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return new ReturnStatement(cloneOptional(node.expression));
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}
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visitTryCatch(TryCatch node) {
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return new TryCatch(clone(node.body), node.catches.map(clone).toList());
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}
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visitCatch(Catch node) {
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var newException = cloneOptional(node.exception);
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var newStackTrace = cloneOptional(node.stackTrace);
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return new Catch(newException, clone(node.body),
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stackTrace: newStackTrace, guard: visitType(node.guard));
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}
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visitTryFinally(TryFinally node) {
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return new TryFinally(clone(node.body), clone(node.finalizer));
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}
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visitYieldStatement(YieldStatement node) {
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return new YieldStatement(clone(node.expression));
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}
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visitVariableDeclaration(VariableDeclaration node) {
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return variables[node] = new VariableDeclaration(node.name,
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initializer: cloneOptional(node.initializer),
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type: visitType(node.type),
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isFinal: node.isFinal,
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isConst: node.isConst,
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isFieldFormal: node.isFieldFormal);
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}
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visitFunctionDeclaration(FunctionDeclaration node) {
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var newVariable = clone(node.variable);
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return new FunctionDeclaration(newVariable, clone(node.function));
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}
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// Members
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visitConstructor(Constructor node) {
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return new Constructor(clone(node.function),
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name: node.name,
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isConst: node.isConst,
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isExternal: node.isExternal,
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initializers: node.initializers.map(clone).toList(),
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transformerFlags: node.transformerFlags)
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..fileEndOffset = node.fileEndOffset;
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}
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visitProcedure(Procedure node) {
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return new Procedure(node.name, node.kind, clone(node.function),
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isAbstract: node.isAbstract,
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isStatic: node.isStatic,
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isExternal: node.isExternal,
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isConst: node.isConst,
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transformerFlags: node.transformerFlags,
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fileUri: node.fileUri)
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..fileEndOffset = node.fileEndOffset;
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}
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visitField(Field node) {
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return new Field(node.name,
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type: visitType(node.type),
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initializer: cloneOptional(node.initializer),
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isFinal: node.isFinal,
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isConst: node.isConst,
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isStatic: node.isStatic,
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hasImplicitGetter: node.hasImplicitGetter,
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hasImplicitSetter: node.hasImplicitSetter,
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transformerFlags: node.transformerFlags,
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fileUri: node.fileUri)
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..fileEndOffset = node.fileEndOffset;
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}
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visitTypeParameter(TypeParameter node) {
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var newNode = new TypeParameter(node.name);
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typeSubstitution[node] = new TypeParameterType(newNode);
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newNode.bound = visitType(node.bound);
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return newNode;
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}
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TreeNode cloneFunctionNodeBody(FunctionNode node) => cloneOptional(node.body);
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visitFunctionNode(FunctionNode node) {
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var typeParameters = node.typeParameters.map(clone).toList();
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var positional = node.positionalParameters.map(clone).toList();
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var named = node.namedParameters.map(clone).toList();
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return new FunctionNode(cloneFunctionNodeBody(node),
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typeParameters: typeParameters,
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positionalParameters: positional,
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namedParameters: named,
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requiredParameterCount: node.requiredParameterCount,
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returnType: visitType(node.returnType),
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asyncMarker: node.asyncMarker,
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dartAsyncMarker: node.dartAsyncMarker)
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..fileEndOffset = node.fileEndOffset;
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}
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visitArguments(Arguments node) {
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return new Arguments(node.positional.map(clone).toList(),
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types: node.types.map(visitType).toList(),
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named: node.named.map(clone).toList());
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}
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visitNamedExpression(NamedExpression node) {
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return new NamedExpression(node.name, clone(node.value));
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}
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}
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