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/*
* Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
* Copyright (C) 2003, 2007, 2008, 2009 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.
*
*/
#ifndef ArgList_h
#define ArgList_h
#include "CallFrame.h"
#include "Register.h"
#include <wtf/HashSet.h>
#include <wtf/Vector.h>
namespace JSC {
class SlotVisitor;
class MarkedArgumentBuffer {
WTF_MAKE_NONCOPYABLE(MarkedArgumentBuffer);
friend class VM;
friend class ArgList;
private:
static const size_t inlineCapacity = 8;
typedef HashSet<MarkedArgumentBuffer*> ListSet;
public:
// Constructor for a read-write list, to which you may append values.
// FIXME: Remove all clients of this API, then remove this API.
MarkedArgumentBuffer()
: m_size(0)
, m_capacity(inlineCapacity)
, m_buffer(&m_inlineBuffer[m_capacity - 1])
, m_markSet(0)
{
}
~MarkedArgumentBuffer()
{
if (m_markSet)
m_markSet->remove(this);
if (EncodedJSValue* base = mallocBase())
delete [] base;
}
size_t size() const { return m_size; }
bool isEmpty() const { return !m_size; }
JSValue at(int i) const
{
if (i >= m_size)
return jsUndefined();
return JSValue::decode(slotFor(i));
}
void clear()
{
m_size = 0;
}
void append(JSValue v)
{
if (m_size >= m_capacity)
return slowAppend(v);
slotFor(m_size) = JSValue::encode(v);
++m_size;
}
void removeLast()
{
ASSERT(m_size);
m_size--;
}
JSValue last()
{
ASSERT(m_size);
return JSValue::decode(slotFor(m_size - 1));
}
static void markLists(HeapRootVisitor&, ListSet&);
private:
JS_EXPORT_PRIVATE void slowAppend(JSValue);
EncodedJSValue& slotFor(int item) const
{
return m_buffer[-item];
}
EncodedJSValue* mallocBase()
{
if (m_capacity == static_cast<int>(inlineCapacity))
return 0;
return &slotFor(m_capacity - 1);
}
int m_size;
int m_capacity;
EncodedJSValue m_inlineBuffer[inlineCapacity];
EncodedJSValue* m_buffer;
ListSet* m_markSet;
private:
// Prohibits new / delete, which would break GC.
void* operator new(size_t size)
{
return fastMalloc(size);
}
void operator delete(void* p)
{
fastFree(p);
}
void* operator new[](size_t);
void operator delete[](void*);
void* operator new(size_t, void*);
void operator delete(void*, size_t);
};
class ArgList {
friend class JIT;
public:
ArgList()
: m_args(0)
, m_argCount(0)
{
}
ArgList(ExecState* exec)
: m_args(reinterpret_cast<JSValue*>(&exec[CallFrame::argumentOffset(0)]))
, m_argCount(exec->argumentCount())
{
}
ArgList(const MarkedArgumentBuffer& args)
: m_args(reinterpret_cast<JSValue*>(args.m_buffer))
, m_argCount(args.size())
{
}
JSValue at(int i) const
{
if (i >= m_argCount)
return jsUndefined();
return 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;
private:
JSValue* m_args;
int m_argCount;
};
} // namespace JSC
#endif // ArgList_h
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