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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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386 // neither in strict nor extended mode. However, the more distinguishing term | 386 // neither in strict nor extended mode. However, the more distinguishing term |
387 // 'classic mode' is used in V8 instead to avoid mix-ups. | 387 // 'classic mode' is used in V8 instead to avoid mix-ups. |
388 | 388 |
389 enum LanguageMode { | 389 enum LanguageMode { |
390 CLASSIC_MODE, | 390 CLASSIC_MODE, |
391 STRICT_MODE, | 391 STRICT_MODE, |
392 EXTENDED_MODE | 392 EXTENDED_MODE |
393 }; | 393 }; |
394 | 394 |
395 | 395 |
396 // A simple Maybe type, that can be passed by value. | |
397 template<class T> | |
398 struct Maybe { | |
399 Maybe() : has_value(false) {} | |
400 explicit Maybe(T t) : has_value(true), value(t) {} | |
401 Maybe(bool has, T t) : has_value(has), value(t) {} | |
402 | |
403 bool has_value; | |
404 T value; | |
405 }; | |
406 | |
407 | |
408 // The Strict Mode (ECMA-262 5th edition, 4.2.2). | 396 // The Strict Mode (ECMA-262 5th edition, 4.2.2). |
409 // | 397 // |
410 // This flag is used in the backend to represent the language mode. So far | 398 // This flag is used in the backend to represent the language mode. So far |
411 // there is no semantic difference between the strict and the extended mode in | 399 // there is no semantic difference between the strict and the extended mode in |
412 // the backend, so both modes are represented by the kStrictMode value. | 400 // the backend, so both modes are represented by the kStrictMode value. |
413 enum StrictModeFlag { | 401 enum StrictModeFlag { |
414 kNonStrictMode, | 402 kNonStrictMode, |
415 kStrictMode | 403 kStrictMode |
416 }; | 404 }; |
417 | 405 |
418 | 406 |
419 } } // namespace v8::internal | 407 } } // namespace v8::internal |
420 | 408 |
421 #endif // V8_GLOBALS_H_ | 409 #endif // V8_GLOBALS_H_ |
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