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ArgList.h
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86 lines (70 loc) · 2.5 KB
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/*
* Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
* Copyright (C) 2003-2023 Apple Inc. All rights reserved.
*
* 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>
#include <wtf/HashSet.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(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 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