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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 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "src/heap/heap.h" | 5 #include "src/heap/heap.h" |
6 | 6 |
7 #include "src/accessors.h" | 7 #include "src/accessors.h" |
8 #include "src/api.h" | 8 #include "src/api.h" |
9 #include "src/ast/context-slot-cache.h" | 9 #include "src/ast/context-slot-cache.h" |
10 #include "src/base/bits.h" | 10 #include "src/base/bits.h" |
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4007 // Statically ensure that it is safe to allocate symbols in paged spaces. | 4007 // Statically ensure that it is safe to allocate symbols in paged spaces. |
4008 STATIC_ASSERT(Symbol::kSize <= kMaxRegularHeapObjectSize); | 4008 STATIC_ASSERT(Symbol::kSize <= kMaxRegularHeapObjectSize); |
4009 | 4009 |
4010 HeapObject* result = nullptr; | 4010 HeapObject* result = nullptr; |
4011 AllocationResult allocation = AllocateRaw(Symbol::kSize, OLD_SPACE); | 4011 AllocationResult allocation = AllocateRaw(Symbol::kSize, OLD_SPACE); |
4012 if (!allocation.To(&result)) return allocation; | 4012 if (!allocation.To(&result)) return allocation; |
4013 | 4013 |
4014 result->set_map_no_write_barrier(symbol_map()); | 4014 result->set_map_no_write_barrier(symbol_map()); |
4015 | 4015 |
4016 // Generate a random hash value. | 4016 // Generate a random hash value. |
4017 int hash; | 4017 int hash = isolate()->GenerateIdentityHash(Name::kHashBitMask); |
4018 int attempts = 0; | |
4019 do { | |
4020 hash = isolate()->random_number_generator()->NextInt() & Name::kHashBitMask; | |
4021 attempts++; | |
4022 } while (hash == 0 && attempts < 30); | |
4023 if (hash == 0) hash = 1; // never return 0 | |
4024 | 4018 |
4025 Symbol::cast(result) | 4019 Symbol::cast(result) |
4026 ->set_hash_field(Name::kIsNotArrayIndexMask | (hash << Name::kHashShift)); | 4020 ->set_hash_field(Name::kIsNotArrayIndexMask | (hash << Name::kHashShift)); |
4027 Symbol::cast(result)->set_name(undefined_value()); | 4021 Symbol::cast(result)->set_name(undefined_value()); |
4028 Symbol::cast(result)->set_flags(0); | 4022 Symbol::cast(result)->set_flags(0); |
4029 | 4023 |
4030 DCHECK(!Symbol::cast(result)->is_private()); | 4024 DCHECK(!Symbol::cast(result)->is_private()); |
4031 return result; | 4025 return result; |
4032 } | 4026 } |
4033 | 4027 |
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6509 } | 6503 } |
6510 | 6504 |
6511 | 6505 |
6512 // static | 6506 // static |
6513 int Heap::GetStaticVisitorIdForMap(Map* map) { | 6507 int Heap::GetStaticVisitorIdForMap(Map* map) { |
6514 return StaticVisitorBase::GetVisitorId(map); | 6508 return StaticVisitorBase::GetVisitorId(map); |
6515 } | 6509 } |
6516 | 6510 |
6517 } // namespace internal | 6511 } // namespace internal |
6518 } // namespace v8 | 6512 } // namespace v8 |
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