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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 // VM-specific implementation of the dart:mirrors library. | 5 // VM-specific implementation of the dart:mirrors library. |
6 | 6 |
7 import "dart:collection"; | 7 import "dart:collection" show UnmodifiableListView, UnmodifiableMapView; |
| 8 import "dart:_internal" show LRUMap; |
8 | 9 |
9 final emptyList = new UnmodifiableListView([]); | 10 final emptyList = new UnmodifiableListView([]); |
10 final emptyMap = new UnmodifiableMapView({}); | 11 final emptyMap = new UnmodifiableMapView({}); |
11 | 12 |
12 class _InternalMirrorError { | 13 class _InternalMirrorError { |
13 final String _msg; | 14 final String _msg; |
14 const _InternalMirrorError(String this._msg); | 15 const _InternalMirrorError(String this._msg); |
15 String toString() => _msg; | 16 String toString() => _msg; |
16 } | 17 } |
17 | 18 |
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291 return other is _LocalInstanceMirror && | 292 return other is _LocalInstanceMirror && |
292 identical(_reflectee, other._reflectee); | 293 identical(_reflectee, other._reflectee); |
293 } | 294 } |
294 | 295 |
295 int get hashCode { | 296 int get hashCode { |
296 // Avoid hash collisions with the reflectee. This constant is in Smi range | 297 // Avoid hash collisions with the reflectee. This constant is in Smi range |
297 // and happens to be the inner padding from RFC 2104. | 298 // and happens to be the inner padding from RFC 2104. |
298 return identityHashCode(_reflectee) ^ 0x36363636; | 299 return identityHashCode(_reflectee) ^ 0x36363636; |
299 } | 300 } |
300 | 301 |
301 // TODO(18445): Use an LRU cache. | 302 static var _getFieldClosures = new LRUMap.withShift(7); |
302 static var _getFieldClosures = new HashMap(); | 303 static var _setFieldClosures = new LRUMap.withShift(7); |
303 static var _setFieldClosures = new HashMap(); | 304 static var _getFieldCallCounts = new LRUMap.withShift(8); |
304 static var _getFieldCallCounts = new HashMap(); | 305 static var _setFieldCallCounts = new LRUMap.withShift(8); |
305 static var _setFieldCallCounts = new HashMap(); | |
306 static const _closureThreshold = 20; | 306 static const _closureThreshold = 20; |
307 static const _cacheSizeLimit = 255; | |
308 | 307 |
309 _getFieldSlow(unwrapped) { | 308 _getFieldSlow(unwrapped) { |
310 // Slow path factored out to give the fast path a better chance at being | 309 // Slow path factored out to give the fast path a better chance at being |
311 // inlined. | 310 // inlined. |
312 if (_getFieldCallCounts.length == 2 * _cacheSizeLimit) { | |
313 // Prevent unbounded cache growth. | |
314 _getFieldCallCounts = new HashMap(); | |
315 } | |
316 var callCount = _getFieldCallCounts[unwrapped]; | 311 var callCount = _getFieldCallCounts[unwrapped]; |
317 if (callCount == null) { | 312 if (callCount == null) { |
318 callCount = 0; | 313 callCount = 0; |
319 } | 314 } |
320 if (callCount == _closureThreshold) { | 315 if (callCount == _closureThreshold) { |
321 // We've seen a successful setter invocation a few times: time to invest | 316 // We've seen a successful setter invocation a few times: time to invest |
322 // in a closure. | 317 // in a closure. |
323 var f; | 318 var f; |
324 var atPosition = unwrapped.indexOf('@'); | 319 var atPosition = unwrapped.indexOf('@'); |
325 if (atPosition == -1) { | 320 if (atPosition == -1) { |
326 // Public symbol. | 321 // Public symbol. |
327 f = _eval('(x) => x.$unwrapped', null); | 322 f = _eval('(x) => x.$unwrapped', null); |
328 } else { | 323 } else { |
329 // Private symbol. | 324 // Private symbol. |
330 var withoutKey = unwrapped.substring(0, atPosition); | 325 var withoutKey = unwrapped.substring(0, atPosition); |
331 var privateKey = unwrapped.substring(atPosition); | 326 var privateKey = unwrapped.substring(atPosition); |
332 f = _eval('(x) => x.$withoutKey', privateKey); | 327 f = _eval('(x) => x.$withoutKey', privateKey); |
333 } | 328 } |
334 if (_getFieldClosures.length == _cacheSizeLimit) { | |
335 // Prevent unbounded cache growth. | |
336 _getFieldClosures = new HashMap(); | |
337 } | |
338 _getFieldClosures[unwrapped] = f; | 329 _getFieldClosures[unwrapped] = f; |
339 _getFieldCallCounts.remove(unwrapped); // We won't look for this again. | |
340 return reflect(f(_reflectee)); | 330 return reflect(f(_reflectee)); |
341 } | 331 } |
342 var result = reflect(_invokeGetter(_reflectee, unwrapped)); | 332 var result = reflect(_invokeGetter(_reflectee, unwrapped)); |
343 // Only update call count if we don't throw to avoid creating closures for | 333 // Only update call count if we don't throw to avoid creating closures for |
344 // non-existent getters. | 334 // non-existent getters. |
345 _getFieldCallCounts[unwrapped] = callCount + 1; | 335 _getFieldCallCounts[unwrapped] = callCount + 1; |
346 return result; | 336 return result; |
347 } | 337 } |
348 | 338 |
349 InstanceMirror getField(Symbol memberName) { | 339 InstanceMirror getField(Symbol memberName) { |
350 var unwrapped = _n(memberName); | 340 var unwrapped = _n(memberName); |
351 var f = _getFieldClosures[unwrapped]; | 341 var f = _getFieldClosures[unwrapped]; |
352 return (f == null) ? _getFieldSlow(unwrapped) : reflect(f(_reflectee)); | 342 return (f == null) ? _getFieldSlow(unwrapped) : reflect(f(_reflectee)); |
353 } | 343 } |
354 | 344 |
355 _setFieldSlow(unwrapped, arg) { | 345 _setFieldSlow(unwrapped, arg) { |
356 // Slow path factored out to give the fast path a better chance at being | 346 // Slow path factored out to give the fast path a better chance at being |
357 // inlined. | 347 // inlined. |
358 if (_setFieldCallCounts.length == 2 * _cacheSizeLimit) { | |
359 _setFieldCallCounts = new HashMap(); | |
360 } | |
361 var callCount = _setFieldCallCounts[unwrapped]; | 348 var callCount = _setFieldCallCounts[unwrapped]; |
362 if (callCount == null) { | 349 if (callCount == null) { |
363 callCount = 0; | 350 callCount = 0; |
364 } | 351 } |
365 if (callCount == _closureThreshold) { | 352 if (callCount == _closureThreshold) { |
366 // We've seen a successful getter invocation a few times: time to invest | 353 // We've seen a successful getter invocation a few times: time to invest |
367 // in a closure. | 354 // in a closure. |
368 var f; | 355 var f; |
369 var atPosition = unwrapped.indexOf('@'); | 356 var atPosition = unwrapped.indexOf('@'); |
370 if (atPosition == -1) { | 357 if (atPosition == -1) { |
371 // Public symbol. | 358 // Public symbol. |
372 f = _eval('(x, v) => x.$unwrapped = v', null); | 359 f = _eval('(x, v) => x.$unwrapped = v', null); |
373 } else { | 360 } else { |
374 // Private symbol. | 361 // Private symbol. |
375 var withoutKey = unwrapped.substring(0, atPosition); | 362 var withoutKey = unwrapped.substring(0, atPosition); |
376 var privateKey = unwrapped.substring(atPosition); | 363 var privateKey = unwrapped.substring(atPosition); |
377 f = _eval('(x, v) => x.$withoutKey = v', privateKey); | 364 f = _eval('(x, v) => x.$withoutKey = v', privateKey); |
378 } | 365 } |
379 if (_setFieldClosures.length == _cacheSizeLimit) { | |
380 // Prevent unbounded cache growth. | |
381 _setFieldClosures = new HashMap(); | |
382 } | |
383 _setFieldClosures[unwrapped] = f; | 366 _setFieldClosures[unwrapped] = f; |
384 _setFieldCallCounts.remove(unwrapped); | |
385 return reflect(f(_reflectee, arg)); | 367 return reflect(f(_reflectee, arg)); |
386 } | 368 } |
387 _invokeSetter(_reflectee, unwrapped, arg); | 369 _invokeSetter(_reflectee, unwrapped, arg); |
388 var result = reflect(arg); | 370 var result = reflect(arg); |
389 // Only update call count if we don't throw to avoid creating closures for | 371 // Only update call count if we don't throw to avoid creating closures for |
390 // non-existent setters. | 372 // non-existent setters. |
391 _setFieldCallCounts[unwrapped] = callCount + 1; | 373 _setFieldCallCounts[unwrapped] = callCount + 1; |
392 return result; | 374 return result; |
393 } | 375 } |
394 | 376 |
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1587 if (typeMirror == null) { | 1569 if (typeMirror == null) { |
1588 typeMirror = makeLocalTypeMirror(key); | 1570 typeMirror = makeLocalTypeMirror(key); |
1589 _instanitationCache[key] = typeMirror; | 1571 _instanitationCache[key] = typeMirror; |
1590 if (typeMirror is ClassMirror && !typeMirror._isGeneric) { | 1572 if (typeMirror is ClassMirror && !typeMirror._isGeneric) { |
1591 _declarationCache[key] = typeMirror; | 1573 _declarationCache[key] = typeMirror; |
1592 } | 1574 } |
1593 } | 1575 } |
1594 return typeMirror; | 1576 return typeMirror; |
1595 } | 1577 } |
1596 } | 1578 } |
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