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1 // Copyright 2020 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_CODEGEN_EXTERNAL_REFERENCE_ENCODER_H_
6 #define V8_CODEGEN_EXTERNAL_REFERENCE_ENCODER_H_
7 
8 #include "src/base/bit-field.h"
9 #include "src/common/globals.h"
10 #include "src/utils/address-map.h"
11 
12 namespace v8 {
13 namespace internal {
14 
15 class Isolate;
16 
17 class ExternalReferenceEncoder {
18  public:
19   class Value {
20    public:
Value(uint32_t raw)21     explicit Value(uint32_t raw) : value_(raw) {}
Value()22     Value() : value_(0) {}
Encode(uint32_t index,bool is_from_api)23     static uint32_t Encode(uint32_t index, bool is_from_api) {
24       return Index::encode(index) | IsFromAPI::encode(is_from_api);
25     }
26 
is_from_api()27     bool is_from_api() const { return IsFromAPI::decode(value_); }
index()28     uint32_t index() const { return Index::decode(value_); }
29 
30    private:
31     using Index = base::BitField<uint32_t, 0, 31>;
32     using IsFromAPI = base::BitField<bool, 31, 1>;
33     uint32_t value_;
34   };
35 
36   explicit ExternalReferenceEncoder(Isolate* isolate);
37   ExternalReferenceEncoder(const ExternalReferenceEncoder&) = delete;
38   ExternalReferenceEncoder& operator=(const ExternalReferenceEncoder&) = delete;
39 #ifdef DEBUG
40   ~ExternalReferenceEncoder();
41 #endif  // DEBUG
42 
43   Value Encode(Address key);
44   Maybe<Value> TryEncode(Address key);
45 
46   const char* NameOfAddress(Isolate* isolate, Address address) const;
47 
48  private:
49   AddressToIndexHashMap* map_;
50 
51 #ifdef DEBUG
52   std::vector<int> count_;
53   const intptr_t* api_references_;
54 #endif  // DEBUG
55 };
56 
57 }  // namespace internal
58 }  // namespace v8
59 
60 #endif  // V8_CODEGEN_EXTERNAL_REFERENCE_ENCODER_H_
61