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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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2361 | 2361 |
2362 Key keys_[kLength]; | 2362 Key keys_[kLength]; |
2363 int field_offsets_[kLength]; | 2363 int field_offsets_[kLength]; |
2364 | 2364 |
2365 friend class ExternalReference; | 2365 friend class ExternalReference; |
2366 friend class Isolate; | 2366 friend class Isolate; |
2367 DISALLOW_COPY_AND_ASSIGN(KeyedLookupCache); | 2367 DISALLOW_COPY_AND_ASSIGN(KeyedLookupCache); |
2368 }; | 2368 }; |
2369 | 2369 |
2370 | 2370 |
2371 // Cache for mapping (array, property name) into descriptor index. | 2371 // Cache for mapping (map, property name) into descriptor index. |
2372 // The cache contains both positive and negative results. | 2372 // The cache contains both positive and negative results. |
2373 // Descriptor index equals kNotFound means the property is absent. | 2373 // Descriptor index equals kNotFound means the property is absent. |
2374 // Cleared at startup and prior to any gc. | 2374 // Cleared at startup and prior to any gc. |
2375 class DescriptorLookupCache { | 2375 class DescriptorLookupCache { |
2376 public: | 2376 public: |
2377 // Lookup descriptor index for (map, name). | 2377 // Lookup descriptor index for (map, name). |
2378 // If absent, kAbsent is returned. | 2378 // If absent, kAbsent is returned. |
2379 int Lookup(DescriptorArray* array, String* name) { | 2379 int Lookup(Map* source, String* name) { |
2380 if (!StringShape(name).IsSymbol()) return kAbsent; | 2380 if (!StringShape(name).IsSymbol()) return kAbsent; |
2381 int index = Hash(array, name); | 2381 int index = Hash(source, name); |
2382 Key& key = keys_[index]; | 2382 Key& key = keys_[index]; |
2383 if ((key.array == array) && (key.name == name)) return results_[index]; | 2383 if ((key.source == source) && (key.name == name)) return results_[index]; |
2384 return kAbsent; | 2384 return kAbsent; |
2385 } | 2385 } |
2386 | 2386 |
2387 // Update an element in the cache. | 2387 // Update an element in the cache. |
2388 void Update(DescriptorArray* array, String* name, int result) { | 2388 void Update(Map* source, String* name, int result) { |
2389 ASSERT(result != kAbsent); | 2389 ASSERT(result != kAbsent); |
2390 if (StringShape(name).IsSymbol()) { | 2390 if (StringShape(name).IsSymbol()) { |
2391 int index = Hash(array, name); | 2391 int index = Hash(source, name); |
2392 Key& key = keys_[index]; | 2392 Key& key = keys_[index]; |
2393 key.array = array; | 2393 key.source = source; |
2394 key.name = name; | 2394 key.name = name; |
2395 results_[index] = result; | 2395 results_[index] = result; |
2396 } | 2396 } |
2397 } | 2397 } |
2398 | 2398 |
2399 // Clear the cache. | 2399 // Clear the cache. |
2400 void Clear(); | 2400 void Clear(); |
2401 | 2401 |
2402 static const int kAbsent = -2; | 2402 static const int kAbsent = -2; |
2403 | 2403 |
2404 private: | 2404 private: |
2405 DescriptorLookupCache() { | 2405 DescriptorLookupCache() { |
2406 for (int i = 0; i < kLength; ++i) { | 2406 for (int i = 0; i < kLength; ++i) { |
2407 keys_[i].array = NULL; | 2407 keys_[i].source = NULL; |
2408 keys_[i].name = NULL; | 2408 keys_[i].name = NULL; |
2409 results_[i] = kAbsent; | 2409 results_[i] = kAbsent; |
2410 } | 2410 } |
2411 } | 2411 } |
2412 | 2412 |
2413 static int Hash(DescriptorArray* array, String* name) { | 2413 static int Hash(Object* source, String* name) { |
2414 // Uses only lower 32 bits if pointers are larger. | 2414 // Uses only lower 32 bits if pointers are larger. |
2415 uint32_t array_hash = | 2415 uint32_t source_hash = |
2416 static_cast<uint32_t>(reinterpret_cast<uintptr_t>(array)) | 2416 static_cast<uint32_t>(reinterpret_cast<uintptr_t>(source)) |
2417 >> kPointerSizeLog2; | 2417 >> kPointerSizeLog2; |
2418 uint32_t name_hash = | 2418 uint32_t name_hash = |
2419 static_cast<uint32_t>(reinterpret_cast<uintptr_t>(name)) | 2419 static_cast<uint32_t>(reinterpret_cast<uintptr_t>(name)) |
2420 >> kPointerSizeLog2; | 2420 >> kPointerSizeLog2; |
2421 return (array_hash ^ name_hash) % kLength; | 2421 return (source_hash ^ name_hash) % kLength; |
2422 } | 2422 } |
2423 | 2423 |
2424 static const int kLength = 64; | 2424 static const int kLength = 64; |
2425 struct Key { | 2425 struct Key { |
2426 DescriptorArray* array; | 2426 Map* source; |
2427 String* name; | 2427 String* name; |
2428 }; | 2428 }; |
2429 | 2429 |
2430 Key keys_[kLength]; | 2430 Key keys_[kLength]; |
2431 int results_[kLength]; | 2431 int results_[kLength]; |
2432 | 2432 |
2433 friend class Isolate; | 2433 friend class Isolate; |
2434 DISALLOW_COPY_AND_ASSIGN(DescriptorLookupCache); | 2434 DISALLOW_COPY_AND_ASSIGN(DescriptorLookupCache); |
2435 }; | 2435 }; |
2436 | 2436 |
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2792 AssertNoAllocation no_alloc; // i.e. no gc allowed. | 2792 AssertNoAllocation no_alloc; // i.e. no gc allowed. |
2793 | 2793 |
2794 private: | 2794 private: |
2795 DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer); | 2795 DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer); |
2796 }; | 2796 }; |
2797 #endif // DEBUG || LIVE_OBJECT_LIST | 2797 #endif // DEBUG || LIVE_OBJECT_LIST |
2798 | 2798 |
2799 } } // namespace v8::internal | 2799 } } // namespace v8::internal |
2800 | 2800 |
2801 #endif // V8_HEAP_H_ | 2801 #endif // V8_HEAP_H_ |
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