11cb0ef41Sopenharmony_ci// Copyright 2020 the V8 project authors. All rights reserved.
21cb0ef41Sopenharmony_ci// Use of this source code is governed by a BSD-style license that can be
31cb0ef41Sopenharmony_ci// found in the LICENSE file.
41cb0ef41Sopenharmony_ci
51cb0ef41Sopenharmony_ci#ifndef V8_CODEGEN_EXTERNAL_REFERENCE_ENCODER_H_
61cb0ef41Sopenharmony_ci#define V8_CODEGEN_EXTERNAL_REFERENCE_ENCODER_H_
71cb0ef41Sopenharmony_ci
81cb0ef41Sopenharmony_ci#include "src/base/bit-field.h"
91cb0ef41Sopenharmony_ci#include "src/common/globals.h"
101cb0ef41Sopenharmony_ci#include "src/utils/address-map.h"
111cb0ef41Sopenharmony_ci
121cb0ef41Sopenharmony_cinamespace v8 {
131cb0ef41Sopenharmony_cinamespace internal {
141cb0ef41Sopenharmony_ci
151cb0ef41Sopenharmony_ciclass Isolate;
161cb0ef41Sopenharmony_ci
171cb0ef41Sopenharmony_ciclass ExternalReferenceEncoder {
181cb0ef41Sopenharmony_ci public:
191cb0ef41Sopenharmony_ci  class Value {
201cb0ef41Sopenharmony_ci   public:
211cb0ef41Sopenharmony_ci    explicit Value(uint32_t raw) : value_(raw) {}
221cb0ef41Sopenharmony_ci    Value() : value_(0) {}
231cb0ef41Sopenharmony_ci    static uint32_t Encode(uint32_t index, bool is_from_api) {
241cb0ef41Sopenharmony_ci      return Index::encode(index) | IsFromAPI::encode(is_from_api);
251cb0ef41Sopenharmony_ci    }
261cb0ef41Sopenharmony_ci
271cb0ef41Sopenharmony_ci    bool is_from_api() const { return IsFromAPI::decode(value_); }
281cb0ef41Sopenharmony_ci    uint32_t index() const { return Index::decode(value_); }
291cb0ef41Sopenharmony_ci
301cb0ef41Sopenharmony_ci   private:
311cb0ef41Sopenharmony_ci    using Index = base::BitField<uint32_t, 0, 31>;
321cb0ef41Sopenharmony_ci    using IsFromAPI = base::BitField<bool, 31, 1>;
331cb0ef41Sopenharmony_ci    uint32_t value_;
341cb0ef41Sopenharmony_ci  };
351cb0ef41Sopenharmony_ci
361cb0ef41Sopenharmony_ci  explicit ExternalReferenceEncoder(Isolate* isolate);
371cb0ef41Sopenharmony_ci  ExternalReferenceEncoder(const ExternalReferenceEncoder&) = delete;
381cb0ef41Sopenharmony_ci  ExternalReferenceEncoder& operator=(const ExternalReferenceEncoder&) = delete;
391cb0ef41Sopenharmony_ci#ifdef DEBUG
401cb0ef41Sopenharmony_ci  ~ExternalReferenceEncoder();
411cb0ef41Sopenharmony_ci#endif  // DEBUG
421cb0ef41Sopenharmony_ci
431cb0ef41Sopenharmony_ci  Value Encode(Address key);
441cb0ef41Sopenharmony_ci  Maybe<Value> TryEncode(Address key);
451cb0ef41Sopenharmony_ci
461cb0ef41Sopenharmony_ci  const char* NameOfAddress(Isolate* isolate, Address address) const;
471cb0ef41Sopenharmony_ci
481cb0ef41Sopenharmony_ci private:
491cb0ef41Sopenharmony_ci  AddressToIndexHashMap* map_;
501cb0ef41Sopenharmony_ci
511cb0ef41Sopenharmony_ci#ifdef DEBUG
521cb0ef41Sopenharmony_ci  std::vector<int> count_;
531cb0ef41Sopenharmony_ci  const intptr_t* api_references_;
541cb0ef41Sopenharmony_ci#endif  // DEBUG
551cb0ef41Sopenharmony_ci};
561cb0ef41Sopenharmony_ci
571cb0ef41Sopenharmony_ci}  // namespace internal
581cb0ef41Sopenharmony_ci}  // namespace v8
591cb0ef41Sopenharmony_ci
601cb0ef41Sopenharmony_ci#endif  // V8_CODEGEN_EXTERNAL_REFERENCE_ENCODER_H_
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