blob: 85c3ed88c1c2bf321e692db73f2eec97f00c074e [file] [log] [blame]
/*
* Copyright (C) 2017 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "JSCJSValue.h"
#include <wtf/StdLibExtras.h>
namespace JSC {
namespace Wasm {
class Callee;
}
class JSCell;
class CalleeBits {
public:
CalleeBits() = default;
CalleeBits(void* ptr) : m_ptr(ptr) { }
CalleeBits& operator=(JSCell* cell)
{
m_ptr = cell;
ASSERT(isCell());
return *this;
}
#if ENABLE(WEBASSEMBLY)
static void* boxWasm(Wasm::Callee* callee)
{
CalleeBits result(reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(callee) | TagBitsWasm));
ASSERT(result.isWasm());
return result.rawPtr();
}
#endif
bool isWasm() const
{
#if ENABLE(WEBASSEMBLY)
return (reinterpret_cast<uintptr_t>(m_ptr) & TagWasmMask) == TagBitsWasm;
#else
return false;
#endif
}
bool isCell() const { return !isWasm(); }
JSCell* asCell() const
{
ASSERT(!isWasm());
return static_cast<JSCell*>(m_ptr);
}
#if ENABLE(WEBASSEMBLY)
Wasm::Callee* asWasmCallee() const
{
ASSERT(isWasm());
return reinterpret_cast<Wasm::Callee*>(reinterpret_cast<uintptr_t>(m_ptr) & ~TagBitsWasm);
}
#endif
void* rawPtr() const { return m_ptr; }
private:
void* m_ptr { nullptr };
};
} // namespace JSC