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| 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
| 2 // for details. All rights reserved. Use of this source code is governed by a |
| 3 // BSD-style license that can be found in the LICENSE file. |
| 4 |
| 5 // IrNodes are kept in a separate library to have precise control over their |
| 6 // dependencies on other parts of the system. |
| 7 library dart2js.ir_nodes; |
| 8 |
| 9 import '../dart2jslib.dart' show Constant; |
| 10 |
| 11 /** |
| 12 * A pair of source offset and an identifier name. Identifier names are used in |
| 13 * the Javascript backend to generate source maps. |
| 14 */ |
| 15 class PositionWithIdentifierName { |
| 16 final int offset; |
| 17 final String sourceName; |
| 18 PositionWithIdentifierName(this.offset, this.sourceName); |
| 19 } |
| 20 |
| 21 abstract class IrNode { |
| 22 final /* int | PositionWithIdentifierName */ position; |
| 23 |
| 24 const IrNode(this.position); |
| 25 |
| 26 int get offset => (position is int) ? position : position.offset; |
| 27 |
| 28 String get sourceName => (position is int) ? null : position.sourceName; |
| 29 |
| 30 accept(IrNodesVisitor visitor); |
| 31 } |
| 32 |
| 33 class IrFunction extends IrNode { |
| 34 final List<IrNode> statements; |
| 35 |
| 36 final int endOffset; |
| 37 final int namePosition; |
| 38 |
| 39 IrFunction(position, this.endOffset, this.namePosition, this.statements) |
| 40 : super(position); |
| 41 |
| 42 accept(IrNodesVisitor visitor) => visitor.visitIrFunction(this); |
| 43 } |
| 44 |
| 45 class IrReturn extends IrNode { |
| 46 final IrNode value; |
| 47 |
| 48 IrReturn(position, this.value) : super(position); |
| 49 |
| 50 accept(IrNodesVisitor visitor) => visitor.visitIrReturn(this); |
| 51 } |
| 52 |
| 53 class IrConstant extends IrNode { |
| 54 final Constant value; |
| 55 |
| 56 IrConstant(position, this.value) : super(position); |
| 57 |
| 58 accept(IrNodesVisitor visitor) => visitor.visitIrConstant(this); |
| 59 } |
| 60 |
| 61 |
| 62 abstract class IrNodesVisitor<T> { |
| 63 T visit(IrNode node) => node.accept(this); |
| 64 |
| 65 void visitAll(List<IrNode> nodes) { |
| 66 for (IrNode n in nodes) visit(n); |
| 67 } |
| 68 |
| 69 T visitNode(IrNode node); |
| 70 |
| 71 T visitIrFunction(IrFunction node) => visitNode(node); |
| 72 T visitIrReturn(IrReturn node) => visitNode(node); |
| 73 T visitIrConstant(IrConstant node) => visitNode(node); |
| 74 } |
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