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string-constants.h
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116 lines (82 loc) · 3.25 KB
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// Copyright 2018 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_STRING_CONSTANTS_H_
#define V8_CODEGEN_STRING_CONSTANTS_H_
#include "src/handles/handles.h"
#include "src/objects/string.h"
#include "src/zone/zone.h"
namespace v8 {
namespace internal {
enum class StringConstantKind {
kStringLiteral,
kNumberToStringConstant,
kStringCons
};
class StringConstantBase : public ZoneObject {
public:
explicit StringConstantBase(StringConstantKind kind) : kind_(kind) {}
StringConstantKind kind() const { return kind_; }
Handle<String> AllocateStringConstant(Isolate* isolate) const;
size_t GetMaxStringConstantLength() const;
bool operator==(const StringConstantBase& other) const;
private:
void Memoize(Handle<String> flattened) const { flattened_ = flattened; }
StringConstantKind kind_;
mutable Handle<String> flattened_ = Handle<String>::null();
};
size_t hash_value(StringConstantBase const& base);
class StringLiteral final : public StringConstantBase {
public:
explicit StringLiteral(Handle<String> str, size_t length)
: StringConstantBase(StringConstantKind::kStringLiteral),
str_(str),
length_(length) {}
Handle<String> str() const { return str_; }
size_t GetMaxStringConstantLength() const;
private:
Handle<String> str_;
size_t length_; // We store this separately to avoid accessing the heap.
};
bool operator==(StringLiteral const& lhs, StringLiteral const& rhs);
bool operator!=(StringLiteral const& lhs, StringLiteral const& rhs);
size_t hash_value(StringLiteral const& parameters);
std::ostream& operator<<(std::ostream& os, StringLiteral const& parameters);
class NumberToStringConstant final : public StringConstantBase {
public:
explicit NumberToStringConstant(double num)
: StringConstantBase(StringConstantKind::kNumberToStringConstant),
num_(num) {}
double num() const { return num_; }
size_t GetMaxStringConstantLength() const;
private:
double num_;
};
bool operator==(NumberToStringConstant const& lhs,
NumberToStringConstant const& rhs);
bool operator!=(NumberToStringConstant const& lhs,
NumberToStringConstant const& rhs);
size_t hash_value(NumberToStringConstant const& parameters);
std::ostream& operator<<(std::ostream& os,
NumberToStringConstant const& parameters);
class StringCons final : public StringConstantBase {
public:
explicit StringCons(const StringConstantBase* lhs,
const StringConstantBase* rhs)
: StringConstantBase(StringConstantKind::kStringCons),
lhs_(lhs),
rhs_(rhs) {}
const StringConstantBase* lhs() const { return lhs_; }
const StringConstantBase* rhs() const { return rhs_; }
size_t GetMaxStringConstantLength() const;
private:
const StringConstantBase* lhs_;
const StringConstantBase* rhs_;
};
bool operator==(StringCons const& lhs, StringCons const& rhs);
bool operator!=(StringCons const& lhs, StringCons const& rhs);
size_t hash_value(StringCons const& parameters);
std::ostream& operator<<(std::ostream& os, StringCons const& parameters);
} // namespace internal
} // namespace v8
#endif // V8_CODEGEN_STRING_CONSTANTS_H_