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LibJS+AK: Move cross-platform stack bounds code from JS::Heap to AK::StackInfo

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This will be useful for other things than the Heap, maybe even outside
of LibJS.
This commit is contained in:
Linus Groh 2020-11-08 12:48:16 +00:00 • committed by Andreas Kling
parent 2d96a07b26
commit 9c3ead8f91
5 changed files with 136 additions and 40 deletions
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54
AK/StackInfo.h Normal file
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/*
* Copyright (c) 2020, the SerenityOS developers.
* 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT HOLDER 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 <AK/Types.h>
namespace AK {
class StackInfo {
public:
StackInfo();
FlatPtr base() const { return m_base; }
FlatPtr top() const { return m_top; }
size_t size() const { return m_size; }
size_t size_free() const
{
FlatPtr dummy;
return reinterpret_cast<FlatPtr>(&dummy) - m_base;
}
private:
FlatPtr m_base;
FlatPtr m_top;
size_t m_size;
};
}
using AK::StackInfo;