mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-26 21:50:53 +00:00
81 lines
2.7 KiB
C++
81 lines
2.7 KiB
C++
/*
|
|
* Copyright (C) 2017-2020 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 <wtf/ForbidHeapAllocation.h>
|
|
|
|
namespace JSC {
|
|
|
|
class VM;
|
|
|
|
// The only reason we implement DisallowVMEntry as specialization of a template
|
|
// is so that we can work around having to #include VM.h, which can hurt build
|
|
// time. This defers the cost of #include'ing VM.h to only the clients that
|
|
// need it.
|
|
|
|
template<typename VMType = VM>
|
|
class DisallowVMEntryImpl {
|
|
WTF_FORBID_HEAP_ALLOCATION;
|
|
public:
|
|
DisallowVMEntryImpl(VMType& vm)
|
|
: m_vm(&vm)
|
|
{
|
|
m_vm->disallowVMEntryCount++;
|
|
}
|
|
|
|
DisallowVMEntryImpl(const DisallowVMEntryImpl& other)
|
|
: m_vm(other.m_vm)
|
|
{
|
|
m_vm->disallowVMEntryCount++;
|
|
}
|
|
|
|
~DisallowVMEntryImpl()
|
|
{
|
|
RELEASE_ASSERT(m_vm->disallowVMEntryCount);
|
|
m_vm->disallowVMEntryCount--;
|
|
m_vm = nullptr;
|
|
}
|
|
|
|
DisallowVMEntryImpl& operator=(const DisallowVMEntryImpl& other)
|
|
{
|
|
RELEASE_ASSERT(m_vm && m_vm == other.m_vm);
|
|
RELEASE_ASSERT(m_vm->disallowVMEntryCount);
|
|
// Conceptually, we need to decrement the disallowVMEntryCount of the
|
|
// old m_vm, and increment the disallowVMEntryCount of the new m_vm.
|
|
// But since the old and the new m_vm should always be the same, the
|
|
// decrementing and incrementing cancels out, and there's nothing more
|
|
// to do here.
|
|
return *this;
|
|
}
|
|
|
|
private:
|
|
VMType* m_vm;
|
|
};
|
|
|
|
using DisallowVMEntry = DisallowVMEntryImpl<VM>;
|
|
|
|
} // namespace JSC
|