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1 // Copyright 2015 the V8 project authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef V8_INTERPRETER_CONSTANT_ARRAY_BUILDER_H_ | |
6 #define V8_INTERPRETER_CONSTANT_ARRAY_BUILDER_H_ | |
7 | |
8 #include "src/identity-map.h" | |
9 #include "src/zone-containers.h" | |
10 | |
11 namespace v8 { | |
12 namespace internal { | |
13 | |
14 class Factory; | |
15 class Isolate; | |
16 | |
17 namespace interpreter { | |
18 | |
19 // A helper class for constructing constant arrays for the interpreter. | |
20 class ConstantArrayBuilder final : public ZoneObject { | |
21 public: | |
22 enum class ReservationToken : uint8_t { kIdx8, kIdx16 }; | |
23 static const size_t kMaxCapacity = kMaxUInt16 + 1; | |
24 static const size_t kLowCapacity = kMaxUInt8 + 1; | |
25 | |
26 ConstantArrayBuilder(Isolate* isolate, Zone* zone); | |
27 | |
28 // Generate a fixed array of constants based on inserted objects. | |
29 Handle<FixedArray> ToFixedArray(Factory* factory, | |
30 PretenureFlag pretenure) const; | |
31 | |
32 // Returns the object in the constant pool array that at index | |
33 // |index|. | |
34 Handle<Object> at(size_t index) const { return constants_[index]; } | |
35 | |
36 // Returns the number of elements in the array. | |
37 size_t size() const { return constants_.size(); } | |
38 | |
39 // Insert an object into the constants array if it is not already | |
40 // present. Returns the array index associated with the object. | |
41 size_t Insert(Handle<Object> object); | |
42 | |
43 // Creates a reserved entry in the constant pool and returns a | |
44 // token that can be subsequently committed or discarded. | |
45 ReservationToken CreateReservedEntry(); | |
46 | |
47 // Commit reserved entry and returns the constant pool index for the | |
48 // object. | |
49 size_t CommitReservedEntry(ReservationToken token, Handle<Object> object); | |
50 | |
51 // Discards constant pool reservation. | |
52 void DiscardReservedEntry(ReservationToken token); | |
53 | |
54 // Get the number of bytes required to hold the index for a | |
55 // reservation. | |
56 static size_t SizeOfReservedArrayIndex(ReservationToken token); | |
mythria
2015/12/24 15:53:44
I am not sure we use this function.
oth
2015/12/27 08:42:34
Thanks, removed.
| |
57 | |
58 private: | |
59 typedef uint16_t index_t; | |
60 | |
61 Isolate* isolate() const { return isolate_; } | |
62 size_t allocated_and_reserved_low() const { | |
63 return static_cast<size_t>(allocated_low_ + reserved_low_); | |
64 } | |
65 | |
66 index_t AllocateEntry(Handle<Object> object); | |
67 void EnsureCapacity(size_t minimum_pool_size); | |
68 | |
69 Isolate* isolate_; | |
70 IdentityMap<index_t> constants_map_; | |
71 ZoneVector<Handle<Object>> constants_; | |
72 // Number of allocated entries with byte index operands | |
73 uint16_t allocated_low_; | |
74 // Number of reserved entries with byte index operands | |
75 uint16_t reserved_low_; | |
76 // Number of reserved entries with 2-byte index operands | |
77 uint16_t reserved_high_; | |
78 }; | |
79 | |
80 } // namespace interpreter | |
81 } // namespace internal | |
82 } // namespace v8 | |
83 | |
84 #endif // V8_INTERPRETER_CONSTANT_ARRAY_BUILDER_H_ | |
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