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// Copyright 2020 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_CODEGEN_EXTERNAL_REFERENCE_ENCODER_H_
#define V8_CODEGEN_EXTERNAL_REFERENCE_ENCODER_H_
#include "src/base/bit-field.h"
#include "src/common/globals.h"
#include "src/utils/address-map.h"
namespace v8 {
namespace internal {
class Isolate;
class ExternalReferenceEncoder {
public:
class Value {
public:
explicit Value(uint32_t raw) : value_(raw) {}
Value() : value_(0) {}
static uint32_t Encode(uint32_t index, bool is_from_api) {
return Index::encode(index) | IsFromAPI::encode(is_from_api);
}
bool is_from_api() const { return IsFromAPI::decode(value_); }
uint32_t index() const { return Index::decode(value_); }
private:
using Index = base::BitField<uint32_t, 0, 31>;
using IsFromAPI = base::BitField<bool, 31, 1>;
uint32_t value_;
};
explicit ExternalReferenceEncoder(Isolate* isolate);
#ifdef DEBUG
~ExternalReferenceEncoder();
#endif // DEBUG
Value Encode(Address key);
Maybe<Value> TryEncode(Address key);
const char* NameOfAddress(Isolate* isolate, Address address) const;
private:
AddressToIndexHashMap* map_;
#ifdef DEBUG
std::vector<int> count_;
const intptr_t* api_references_;
#endif // DEBUG
DISALLOW_COPY_AND_ASSIGN(ExternalReferenceEncoder);
};
} // namespace internal
} // namespace v8
#endif // V8_CODEGEN_EXTERNAL_REFERENCE_ENCODER_H_
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