WebKit/Source/JavaScriptCore/runtime/ArgList.h at main · WebKit/WebKit · GitHub

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* This library is free software; you can redistribute it and/or

* modify it under the terms of the GNU Library General Public

* License as published by the Free Software Foundation; either

* version 2 of the License, or (at your option) any later version.

* This library is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

* Library General Public License for more details.

* You should have received a copy of the GNU Library General Public License

* along with this library; see the file COPYING.LIB. If not, write to

* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

* Boston, MA 02110-1301, USA.

#pragma once

#include <JavaScriptCore/CallFrame.h>

#include <JavaScriptCore/MarkedVector.h>

WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN

namespace JSC {

class ArgList {

WTF_MAKE_TZONE_ALLOCATED(ArgList);

friend class Interpreter;

friend class JIT;

public:

ArgList() = default;

ArgList(CallFrame* callFrame)

: m_args(reinterpret_cast<EncodedJSValue*>(&callFrame[CallFrame::argumentOffset(0)]))

, m_argCount(callFrame->argumentCount())

{

}

ArgList(CallFrame* callFrame, int startingFrom)

: m_args(reinterpret_cast<EncodedJSValue*>(&callFrame[CallFrame::argumentOffset(startingFrom)]))

, m_argCount(callFrame->argumentCount() - startingFrom)

{

ASSERT(static_cast<int>(callFrame->argumentCount()) >= startingFrom);

}

template<size_t inlineCapacity>

ArgList(const MarkedVector<JSValue, inlineCapacity, RecordOverflow>& args)

: m_args(std::bit_cast<EncodedJSValue*>(args.m_buffer))

, m_argCount(args.size())

{

}

ArgList(EncodedJSValue* args, unsigned count)

: m_args(args)

, m_argCount(count)

{

}

JSValue at(unsigned i) const

{

if (i >= m_argCount)

return jsUndefined();

return JSValue::decode(m_args[i]);

}

bool isEmpty() const { return !m_argCount; }

size_t size() const { return m_argCount; }

JS_EXPORT_PRIVATE void NODELETE getSlice(int startIndex, ArgList& result) const;

EncodedJSValue* data() const { return m_args; }

private:

EncodedJSValue* m_args { nullptr };

unsigned m_argCount { 0 };

};

} // namespace JSC

WTF_ALLOW_UNSAFE_BUFFER_USAGE_END

WebKit/Source/JavaScriptCore/runtime/ArgList.h at main · WebKit/WebKit · GitHub

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