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1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 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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402 // ---------------------------------------------------------------------------- | 402 // ---------------------------------------------------------------------------- |
403 // All heap objects containing executable code (code objects) must be allocated | 403 // All heap objects containing executable code (code objects) must be allocated |
404 // from a 2 GB range of memory, so that they can call each other using 32-bit | 404 // from a 2 GB range of memory, so that they can call each other using 32-bit |
405 // displacements. This happens automatically on 32-bit platforms, where 32-bit | 405 // displacements. This happens automatically on 32-bit platforms, where 32-bit |
406 // displacements cover the entire 4GB virtual address space. On 64-bit | 406 // displacements cover the entire 4GB virtual address space. On 64-bit |
407 // platforms, we support this using the CodeRange object, which reserves and | 407 // platforms, we support this using the CodeRange object, which reserves and |
408 // manages a range of virtual memory. | 408 // manages a range of virtual memory. |
409 class CodeRange { | 409 class CodeRange { |
410 public: | 410 public: |
411 explicit CodeRange(Isolate* isolate); | 411 explicit CodeRange(Isolate* isolate); |
| 412 ~CodeRange() { TearDown(); } |
412 | 413 |
413 // Reserves a range of virtual memory, but does not commit any of it. | 414 // Reserves a range of virtual memory, but does not commit any of it. |
414 // Can only be called once, at heap initialization time. | 415 // Can only be called once, at heap initialization time. |
415 // Returns false on failure. | 416 // Returns false on failure. |
416 bool Setup(const size_t requested_size); | 417 bool Setup(const size_t requested_size); |
417 | 418 |
418 // Frees the range of virtual memory, and frees the data structures used to | 419 // Frees the range of virtual memory, and frees the data structures used to |
419 // manage it. | 420 // manage it. |
420 void TearDown(); | 421 void TearDown(); |
421 | 422 |
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2304 } | 2305 } |
2305 // Must be small, since an iteration is used for lookup. | 2306 // Must be small, since an iteration is used for lookup. |
2306 static const int kMaxComments = 64; | 2307 static const int kMaxComments = 64; |
2307 }; | 2308 }; |
2308 #endif | 2309 #endif |
2309 | 2310 |
2310 | 2311 |
2311 } } // namespace v8::internal | 2312 } } // namespace v8::internal |
2312 | 2313 |
2313 #endif // V8_SPACES_H_ | 2314 #endif // V8_SPACES_H_ |
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