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| 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
| 2 // for details. All rights reserved. Use of this source code is governed by a | 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. | 3 // BSD-style license that can be found in the LICENSE file. |
| 4 | 4 |
| 5 part of dart2js; | 5 part of dart2js; |
| 6 | 6 |
| 7 /** | 7 /** |
| 8 * The [ConstantHandler] keeps track of compile-time constants, | 8 * The [ConstantHandler] keeps track of compile-time constants, |
| 9 * initializations of global and static fields, and default values of | 9 * initializations of global and static fields, and default values of |
| 10 * optional parameters. | 10 * optional parameters. |
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| 151 assert(!isConst); | 151 assert(!isConst); |
| 152 lazyStatics.add(element); | 152 lazyStatics.add(element); |
| 153 } | 153 } |
| 154 pendingVariables.remove(element); | 154 pendingVariables.remove(element); |
| 155 return value; | 155 return value; |
| 156 }); | 156 }); |
| 157 } | 157 } |
| 158 | 158 |
| 159 Constant compileNodeWithDefinitions(Node node, | 159 Constant compileNodeWithDefinitions(Node node, |
| 160 TreeElements definitions, | 160 TreeElements definitions, |
| 161 {bool isConst}) { | 161 {bool isConst: false}) { |
| 162 return measure(() { | 162 return measure(() { |
| 163 assert(node != null); | 163 assert(node != null); |
| 164 CompileTimeConstantEvaluator evaluator = new CompileTimeConstantEvaluator( | 164 CompileTimeConstantEvaluator evaluator = new CompileTimeConstantEvaluator( |
| 165 constantSystem, definitions, compiler, isConst: isConst); | 165 constantSystem, definitions, compiler, isConst: isConst); |
| 166 return evaluator.evaluate(node); | 166 return evaluator.evaluate(node); |
| 167 }); | 167 }); |
| 168 } | 168 } |
| 169 | 169 |
| 170 /** Attempts to compile a constant expression. Returns null if not possible */ | 170 /** Attempts to compile a constant expression. Returns null if not possible */ |
| 171 Constant tryCompileNodeWithDefinitions(Node node, TreeElements definitions) { | 171 Constant tryCompileNodeWithDefinitions(Node node, TreeElements definitions) { |
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| 243 | 243 |
| 244 class CompileTimeConstantEvaluator extends Visitor { | 244 class CompileTimeConstantEvaluator extends Visitor { |
| 245 bool isEvaluatingConstant; | 245 bool isEvaluatingConstant; |
| 246 final ConstantSystem constantSystem; | 246 final ConstantSystem constantSystem; |
| 247 final TreeElements elements; | 247 final TreeElements elements; |
| 248 final Compiler compiler; | 248 final Compiler compiler; |
| 249 | 249 |
| 250 CompileTimeConstantEvaluator(this.constantSystem, | 250 CompileTimeConstantEvaluator(this.constantSystem, |
| 251 this.elements, | 251 this.elements, |
| 252 this.compiler, | 252 this.compiler, |
| 253 {bool isConst}) | 253 {bool isConst: false}) |
| 254 : this.isEvaluatingConstant = isConst; | 254 : this.isEvaluatingConstant = isConst; |
| 255 | 255 |
| 256 Constant evaluate(Node node) { | 256 Constant evaluate(Node node) { |
| 257 return node.accept(this); | 257 return node.accept(this); |
| 258 } | 258 } |
| 259 | 259 |
| 260 Constant evaluateConstant(Node node) { | 260 Constant evaluateConstant(Node node) { |
| 261 bool oldIsEvaluatingConstant = isEvaluatingConstant; | 261 bool oldIsEvaluatingConstant = isEvaluatingConstant; |
| 262 isEvaluatingConstant = true; | 262 isEvaluatingConstant = true; |
| 263 Constant result = node.accept(this); | 263 Constant result = node.accept(this); |
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| 809 // Use the default value. | 809 // Use the default value. |
| 810 fieldValue = compiler.compileConstant(field); | 810 fieldValue = compiler.compileConstant(field); |
| 811 } | 811 } |
| 812 jsNewArguments.add(fieldValue); | 812 jsNewArguments.add(fieldValue); |
| 813 }, | 813 }, |
| 814 includeBackendMembers: true, | 814 includeBackendMembers: true, |
| 815 includeSuperMembers: true); | 815 includeSuperMembers: true); |
| 816 return jsNewArguments; | 816 return jsNewArguments; |
| 817 } | 817 } |
| 818 } | 818 } |
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