| // Copyright 2018 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef V8_OBJECTS_HEAP_NUMBER_H_ |
| #define V8_OBJECTS_HEAP_NUMBER_H_ |
| |
| #include "src/objects/primitive-heap-object.h" |
| #include "src/objects/tagged-field.h" |
| |
| // Has to be the last include (doesn't have include guards): |
| #include "src/objects/object-macros.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| namespace maglev { |
| class MaglevGraphBuilder; |
| class StoreDoubleField; |
| } // namespace maglev |
| |
| namespace compiler { |
| class GraphAssembler; |
| } // namespace compiler |
| |
| // The HeapNumber class describes heap allocated numbers that cannot be |
| // represented in a Smi (small integer). |
| V8_OBJECT class HeapNumber : public PrimitiveHeapObject { |
| public: |
| inline double value() const; |
| inline void set_value(double value); |
| |
| inline uint64_t value_as_bits() const; |
| inline void set_value_as_bits(uint64_t bits); |
| |
| static const uint32_t kSignMask = 0x80000000u; |
| static const uint32_t kExponentMask = 0x7ff00000u; |
| static const uint32_t kMantissaMask = 0xfffffu; |
| static const int kMantissaBits = 52; |
| static const int kExponentBits = 11; |
| static const int kExponentBias = 1023; |
| static const int kExponentShift = 20; |
| static const int kInfinityOrNanExponent = |
| (kExponentMask >> kExponentShift) - kExponentBias; |
| static const int kMantissaBitsInTopWord = 20; |
| static const int kNonMantissaBitsInTopWord = 12; |
| |
| DECL_CAST(HeapNumber) |
| DECL_PRINTER(HeapNumber) |
| DECL_VERIFIER(HeapNumber) |
| V8_EXPORT_PRIVATE void HeapNumberShortPrint(std::ostream& os); |
| |
| class BodyDescriptor; |
| |
| private: |
| friend struct OffsetsForDebug; |
| friend class CodeStubAssembler; |
| friend class AccessorAssembler; |
| friend class maglev::MaglevAssembler; |
| friend class maglev::MaglevGraphBuilder; |
| friend class maglev::StoreDoubleField; |
| friend class compiler::AccessBuilder; |
| friend class compiler::GraphAssembler; |
| friend class TorqueGeneratedHeapNumberAsserts; |
| friend AllocationAlignment HeapObject::RequiredAlignment(Tagged<Map> map); |
| |
| UnalignedDoubleMember value_; |
| } V8_OBJECT_END; |
| |
| } // namespace internal |
| } // namespace v8 |
| |
| #include "src/objects/object-macros-undef.h" |
| |
| #endif // V8_OBJECTS_HEAP_NUMBER_H_ |