ClearScript/ClearScriptV8/V8Value.h at master · ClearFoundry/ClearScript · GitHub

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// Licensed under the MIT license.

#pragma once

//-----------------------------------------------------------------------------

// V8BigInt

//-----------------------------------------------------------------------------

class V8BigInt final

{

public:

V8BigInt(int signBit, std::vector<uint64_t>&& words):

m_SignBit(signBit),

m_Words(std::move(words))

{

}

V8BigInt(const V8BigInt& that):

m_SignBit(that.m_SignBit),

m_Words(that.m_Words)

{

}

V8BigInt(V8BigInt&& that) noexcept:

m_SignBit(that.m_SignBit),

m_Words(std::move(that.m_Words))

{

}

const V8BigInt& operator=(const V8BigInt& that)

{

if (&that != this)

{

m_SignBit = that.m_SignBit;

m_Words = that.m_Words;

}

return *this;

}

const V8BigInt& operator=(V8BigInt&& that) noexcept

{

if (&that != this)

{

m_SignBit = that.m_SignBit;

m_Words = std::move(that.m_Words);

}

return *this;

}

int GetSignBit() const

{

return m_SignBit;

}

const std::vector<uint64_t>& GetWords() const

{

return m_Words;

}

private:

int m_SignBit;

std::vector<uint64_t> m_Words;

};

//-----------------------------------------------------------------------------

// V8Value

//-----------------------------------------------------------------------------

class V8Value

{

public:

enum NonexistentInitializer

{

Nonexistent

};

enum UndefinedInitializer

{

Undefined

};

enum NullInitializer

{

Null

};

enum DateTimeInitializer

{

DateTime

};

enum class Type: uint8_t

{

// IMPORTANT: maintain bitwise equivalence with managed enum V8.SplitProxy.V8Value.Type

Nonexistent,

Undefined,

Null,

Boolean,

Number,

String,

DateTime,

BigInt,

V8Object,

HostObject

};

enum class Subtype: uint8_t

{

// IMPORTANT: maintain bitwise equivalence with managed enum V8.SplitProxy.V8Value.Subtype

None,

Function,

Iterator,

Promise,

Array,

ArrayBuffer,

DataView,

Uint8Array,

Uint8ClampedArray,

Int8Array,

Uint16Array,

Int16Array,

Uint32Array,

Int32Array,

BigUint64Array,

BigInt64Array,

Float32Array,

Float64Array

};

enum class Flags : uint16_t

{

// IMPORTANT: maintain bitwise equivalence with managed enum V8.SplitProxy.V8Value.Flags

None = 0,

Shared = 0x0001,

Fast = 0x0001,

Async = 0x0002,

Generator = 0x0004,

Pending = 0x0008,

Rejected = 0x0010,

Iterable = 0x0020,

AsyncIterable = 0x0040,

Disposable = 0x0080,

AsyncDisposable = 0x0100

};

struct WireData;

struct Decoded;

struct FastArg;

struct FastResult;

struct FastScriptArg;

struct FastScriptResult;

explicit V8Value(NonexistentInitializer):

m_Type(Type::Nonexistent)

{

}

explicit V8Value(UndefinedInitializer):

m_Type(Type::Undefined)

{

}

explicit V8Value(NullInitializer):

m_Type(Type::Null)

{

}

explicit V8Value(bool value):

m_Type(Type::Boolean)

{

m_Data.BooleanValue = value;

}

explicit V8Value(double value):

m_Type(Type::Number)

{

m_Data.DoubleValue = value;

}

explicit V8Value(const StdString* pString):

m_Type(Type::String)

{

m_Data.pString = pString;

}

V8Value(DateTimeInitializer, double value):

m_Type(Type::DateTime)

{

m_Data.DoubleValue = value;

}

explicit V8Value(const V8BigInt* pBigInt):

m_Type(Type::BigInt)

{

m_Data.pBigInt = pBigInt;

}

V8Value(V8ObjectHolder* pV8ObjectHolder, Subtype subtype, Flags flags):

m_Type(Type::V8Object),

m_Subtype(subtype),

m_Flags(flags)

{

m_Data.pV8ObjectHolder = pV8ObjectHolder;

}

explicit V8Value(HostObjectHolder* pHostObjectHolder):

m_Type(Type::HostObject),

m_Subtype(::ToEnum<Subtype>(pHostObjectHolder->GetSubtype())),

m_Flags(::ToEnum<Flags>(pHostObjectHolder->GetFlags()))

{

m_Data.pHostObjectHolder = pHostObjectHolder;

}

V8Value(const V8Value& that)

{

Copy(that);

}

V8Value(V8Value&& that) noexcept

{

Move(that);

}

explicit V8Value(const FastResult& result)

{

InitializeFromFastResult(result);

}

explicit V8Value(void*) = delete;

const V8Value& operator=(const V8Value& that)

{

Dispose();

Copy(that);

return *this;

}

const V8Value& operator=(V8Value&& that) noexcept

{

Dispose();

Move(that);

return *this;

}

bool IsNonexistent() const

{

return m_Type == Type::Nonexistent;

}

bool IsUndefined() const

{

return m_Type == Type::Undefined;

}

bool IsNull() const

{

return m_Type == Type::Null;

}

bool AsBoolean(bool& result) const

{

if (m_Type == Type::Boolean)

{

result = m_Data.BooleanValue;

return true;

}

return false;

}

bool AsNumber(double& result) const

{

if (m_Type == Type::Number)

{

result = m_Data.DoubleValue;

return true;

}

return false;

}

bool AsString(const StdString*& pString) const

{

if (m_Type == Type::String)

{

pString = m_Data.pString;

return true;

}

return false;

}

bool AsDateTime(double& result) const

{

if (m_Type == Type::DateTime)

{

result = m_Data.DoubleValue;

return true;

}

return false;

}

bool AsBigInt(const V8BigInt*& pBigInt) const

{

if (m_Type == Type::BigInt)

{

pBigInt = m_Data.pBigInt;

return true;

}

return false;

}

bool AsV8Object(V8ObjectHolder*& pV8ObjectHolder, Subtype& subtype, Flags& flags) const

{

if (m_Type == Type::V8Object)

{

pV8ObjectHolder = m_Data.pV8ObjectHolder;

subtype = m_Subtype;

flags = m_Flags;

return true;

}

return false;

}

bool AsHostObject(HostObjectHolder*& pHostObjectHolder, Subtype& subtype, Flags& flags) const

{

if (m_Type == Type::HostObject)

{

pHostObjectHolder = m_Data.pHostObjectHolder;

subtype = m_Subtype;

flags = m_Flags;

return true;

}

return false;

}

Type GetType() const

{

return m_Type;

}

void Decode(Decoded& decoded) const;

~V8Value()

{

Dispose();

}

private:

union Data

{

bool BooleanValue;

double DoubleValue;

const StdString* pString;

V8ObjectHolder* pV8ObjectHolder;

HostObjectHolder* pHostObjectHolder;

const V8BigInt* pBigInt;

};

void Copy(const V8Value& that)

{

m_Type = that.m_Type;

m_Subtype = that.m_Subtype;

m_Flags = that.m_Flags;

if (m_Type == Type::Boolean)

{

m_Data.BooleanValue = that.m_Data.BooleanValue;

}

else if (m_Type == Type::Number)

{

m_Data.DoubleValue = that.m_Data.DoubleValue;

}

else if (m_Type == Type::String)

{

m_Data.pString = new StdString(*that.m_Data.pString);

}

else if (m_Type == Type::DateTime)

{

m_Data.DoubleValue = that.m_Data.DoubleValue;

}

else if (m_Type == Type::BigInt)

{

m_Data.pBigInt = new V8BigInt(*that.m_Data.pBigInt);

}

else if (m_Type == Type::V8Object)

{

m_Data.pV8ObjectHolder = that.m_Data.pV8ObjectHolder->Clone();

}

else if (m_Type == Type::HostObject)

{

m_Data.pHostObjectHolder = that.m_Data.pHostObjectHolder->Clone();

}

void Move(V8Value& that)

{

m_Type = that.m_Type;

m_Subtype = that.m_Subtype;

m_Flags = that.m_Flags;

m_Data = that.m_Data;

that.m_Type = Type::Nonexistent;

}

void InitializeFromFastResult(const FastResult& result);

void Dispose()

{

if (m_Type == Type::String)

{

delete m_Data.pString;

}

else if (m_Type == Type::BigInt)

{

delete m_Data.pBigInt;

}

else if (m_Type == Type::V8Object)

{

delete m_Data.pV8ObjectHolder;

}

else if (m_Type == Type::HostObject)

{

delete m_Data.pHostObjectHolder;

}

Type m_Type;

Subtype m_Subtype;

Flags m_Flags;

int32_t m_Padding;

Data m_Data;

};

static_assert(sizeof(V8Value) == 16, "The managed SplitProxy code assumes that sizeof(V8Value) is 16 on all platforms.");

//-----------------------------------------------------------------------------

// DefaultInitializedV8Value

//-----------------------------------------------------------------------------

template <typename TInitializer>

class DefaultInitializedV8Value final: public V8Value

{

public:

using V8Value::V8Value;

DefaultInitializedV8Value():

V8Value(ms_Initializer)

{

static_assert(sizeof(DefaultInitializedV8Value) == sizeof(V8Value));

}

using V8Value::operator=;

private:

static const TInitializer ms_Initializer {};

};

using NonexistentV8Value = DefaultInitializedV8Value<V8Value::NonexistentInitializer>;

using UndefinedV8Value = DefaultInitializedV8Value<V8Value::UndefinedInitializer>;

using NullV8Value = DefaultInitializedV8Value<V8Value::NullInitializer>;

ClearScript/ClearScriptV8/V8Value.h at master · ClearFoundry/ClearScript · GitHub

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