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1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2011, 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 /** A dynamic member stub. */ | 5 /** A dynamic member stub. */ |
6 class VarMember { | 6 class VarMember { |
7 final String name; | 7 final String name; |
8 bool isGenerated = false; | 8 bool isGenerated = false; |
9 | 9 |
10 VarMember(this.name); | 10 VarMember(this.name); |
11 | 11 |
12 abstract void generate(CodeWriter code); | 12 abstract void generate(CodeWriter code); |
13 | 13 |
| 14 String get body() => null; |
| 15 |
14 Type get returnType() => world.varType; | 16 Type get returnType() => world.varType; |
15 | 17 |
16 Value invoke(MethodGenerator context, Node node, Value target, Arguments args)
{ | 18 Value invoke(CallingContext context, Node node, Value target, Arguments args)
{ |
17 return new Value(returnType, | 19 return new Value(returnType, |
18 '${target.code}.$name(${args.getCode()})', node.span); | 20 '${target.code}.$name(${args.getCode()})', node.span); |
19 } | 21 } |
20 } | 22 } |
21 | 23 |
22 /** | 24 /** |
23 * This function generates a dynamic call stub for functions. It's part of a | 25 * This function generates a dynamic call stub for functions. It's part of a |
24 * series of steps described below. Most of the code is generated by | 26 * series of steps described below. Most of the code is generated by |
25 * gen.dart, with some helpers in core.js | 27 * gen.dart, with some helpers in core.js |
26 * | 28 * |
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66 class VarFunctionStub extends VarMember { | 68 class VarFunctionStub extends VarMember { |
67 final Arguments args; | 69 final Arguments args; |
68 | 70 |
69 VarFunctionStub(String name, Arguments callArgs) | 71 VarFunctionStub(String name, Arguments callArgs) |
70 : super(name), args = callArgs.toCallStubArgs() { | 72 : super(name), args = callArgs.toCallStubArgs() { |
71 // Ensure dependency is generated | 73 // Ensure dependency is generated |
72 world.functionImplType.markUsed(); | 74 world.functionImplType.markUsed(); |
73 world.gen.genMethod(world.functionImplType.getMember('_genStub')); | 75 world.gen.genMethod(world.functionImplType.getMember('_genStub')); |
74 } | 76 } |
75 | 77 |
76 Value invoke(MethodGenerator context, Node node, Value target, | 78 Value invoke(CallingContext context, Node node, Value target, |
77 Arguments args) { | 79 Arguments args) { |
78 return super.invoke(context, node, target, args); | 80 return super.invoke(context, node, target, args); |
79 } | 81 } |
80 | 82 |
81 void generate(CodeWriter code) { | 83 void generate(CodeWriter code) { |
82 isGenerated = true; | 84 isGenerated = true; |
83 if (args.hasNames) { | 85 if (args.hasNames) { |
84 generateNamed(code); | 86 generateNamed(code); |
85 } else { | 87 } else { |
86 generatePositional(code); | 88 generatePositional(code); |
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211 final Type returnType; | 213 final Type returnType; |
212 final Arguments args; | 214 final Arguments args; |
213 | 215 |
214 bool invoked = false; | 216 bool invoked = false; |
215 | 217 |
216 VarMethodSet(this.baseName, String name, this.members, Arguments callArgs, | 218 VarMethodSet(this.baseName, String name, this.members, Arguments callArgs, |
217 this.returnType) | 219 this.returnType) |
218 : super(name), args = callArgs.toCallStubArgs() { | 220 : super(name), args = callArgs.toCallStubArgs() { |
219 } | 221 } |
220 | 222 |
221 Value invoke(MethodGenerator context, Node node, Value target, | 223 Value invoke(CallingContext context, Node node, Value target, |
222 Arguments args) { | 224 Arguments args) { |
223 _invokeMembers(context, node); | 225 _invokeMembers(context, node); |
224 return super.invoke(context, node, target, args); | 226 return super.invoke(context, node, target, args); |
225 } | 227 } |
226 | 228 |
227 /** Invokes members to ensure they're generated. */ | 229 /** Invokes members to ensure they're generated. */ |
228 _invokeMembers(MethodGenerator context, Node node) { | 230 _invokeMembers(CallingContext context, Node node) { |
229 if (invoked) return; | 231 if (invoked) return; |
230 invoked = true; | 232 invoked = true; |
231 | 233 |
232 bool hasObjectType = false; | 234 bool hasObjectType = false; |
233 for (var member in members) { | 235 for (var member in members) { |
234 // Invoke the member with the stub args (this gives us the method body), | 236 // Invoke the member with the stub args (this gives us the method body), |
235 // then create the stub method. | 237 // then create the stub method. |
236 final type = member.declaringType; | 238 final type = member.declaringType; |
237 final target = new Value(type, 'this', node.span); | 239 final target = new Value(type, 'this', node.span); |
238 var result = member.invoke(context, node, target, args, isDynamic:true); | 240 var result = member.invoke(context, node, target, args); |
239 var stub = new VarMethodStub(name, member, args, 'return ' + result.code); | 241 var stub = new VarMethodStub(name, member, args, 'return ' + result.code); |
240 type.varStubs[stub.name] = stub; | 242 type.varStubs[stub.name] = stub; |
241 if (type.isObject) hasObjectType = true; | 243 if (type.isObject) hasObjectType = true; |
242 } | 244 } |
243 | 245 |
244 // Create a noSuchMethod fallback on Object if needed. | 246 // Create a noSuchMethod fallback on Object if needed. |
245 // Some methods, like toString and == already have a fallback on Object. | 247 // Some methods, like toString and == already have a fallback on Object. |
246 if (!hasObjectType) { | 248 if (!hasObjectType) { |
247 final target = new Value(world.objectType, 'this', node.span); | 249 final target = new Value(world.objectType, 'this', node.span); |
248 var result = target.invokeNoSuchMethod(context, baseName, node, args); | 250 var result = target.invokeNoSuchMethod(context, baseName, node, args); |
249 var stub = new VarMethodStub(name, null, args, 'return ' + result.code); | 251 var stub = new VarMethodStub(name, null, args, 'return ' + result.code); |
250 world.objectType.varStubs[stub.name] = stub; | 252 world.objectType.varStubs[stub.name] = stub; |
251 } | 253 } |
252 } | 254 } |
253 | 255 |
254 // TODO(jmesserly): get rid of this as it's unused now | 256 // TODO(jmesserly): get rid of this as it's unused now |
255 void generate(CodeWriter code) {} | 257 void generate(CodeWriter code) {} |
256 } | 258 } |
257 | 259 |
258 String _getCallStubName(String name, Arguments args) { | 260 String _getCallStubName(String name, Arguments args) { |
259 // TODO: This code needs global knowledge to ensure the stub name does not | 261 // TODO: This code needs global knowledge to ensure the stub name does not |
260 // collide with any other name. E.g. it is unlikely but possible for the user | 262 // collide with any other name. E.g. it is unlikely but possible for the user |
261 // to have methods called 'foo' and 'foo$0'. | 263 // to have methods called 'foo' and 'foo$0'. |
262 final nameBuilder = new StringBuffer('${name}\$${args.bareCount}'); | 264 final nameBuilder = new StringBuffer('${name}\$${args.bareCount}'); |
263 for (int i = args.bareCount; i < args.length; i++) { | 265 for (int i = args.bareCount; i < args.length; i++) { |
264 var name = args.getName(i); | 266 var argName = args.getName(i); |
265 nameBuilder.add('\$'); | 267 nameBuilder.add('\$'); |
266 if (name.contains('\$')) { | 268 if (argName.contains('\$')) { |
267 // Disambiguate "a:b:" from "a$b:". Using the length works well because | 269 // Disambiguate "a:b:" from "a$b:". Using the length works well because |
268 // the names can't start with digits. | 270 // the names can't start with digits. |
269 nameBuilder.add('${name.length}'); | 271 nameBuilder.add('${argName.length}'); |
270 } | 272 } |
271 nameBuilder.add(name); | 273 nameBuilder.add(argName); |
272 } | 274 } |
273 return nameBuilder.toString(); | 275 return nameBuilder.toString(); |
274 } | 276 } |
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