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 #ifdef DEBUG 38 ~ExternalReferenceEncoder(); 39 #endif // DEBUG 40 41 Value Encode(Address key); 42 Maybe<Value> TryEncode(Address key); 43 44 const char* NameOfAddress(Isolate* isolate, Address address) const; 45 46 private: 47 AddressToIndexHashMap* map_; 48 49 #ifdef DEBUG 50 std::vector<int> count_; 51 const intptr_t* api_references_; 52 #endif // DEBUG 53 54 DISALLOW_COPY_AND_ASSIGN(ExternalReferenceEncoder); 55 }; 56 57 } // namespace internal 58 } // namespace v8 59 60 #endif // V8_CODEGEN_EXTERNAL_REFERENCE_ENCODER_H_ 61