mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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80 lines
3.0 KiB
C++
80 lines
3.0 KiB
C++
/*
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* Copyright (C) 2013, 2016 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "Register.h"
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#include "StackAlignment.h"
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#include <wtf/Assertions.h>
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namespace JSC {
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// The maxFrameExtentForSlowPathCall is the max amount of stack space (in bytes)
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// that can be used for outgoing args when calling a slow path C function
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// from JS code.
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#if !ENABLE(ASSEMBLER)
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static constexpr size_t maxFrameExtentForSlowPathCall = 0;
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#elif CPU(X86_64) && OS(WINDOWS)
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// 4 args in registers, but stack space needs to be allocated for all args.
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static constexpr size_t maxFrameExtentForSlowPathCall = 64;
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#elif CPU(X86_64)
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// All args in registers.
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static constexpr size_t maxFrameExtentForSlowPathCall = 0;
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#elif CPU(X86)
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// 7 args on stack (28 bytes).
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static constexpr size_t maxFrameExtentForSlowPathCall = 40;
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#elif CPU(ARM64) || CPU(ARM64E)
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// All args in registers.
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static constexpr size_t maxFrameExtentForSlowPathCall = 0;
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#elif CPU(ARM)
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// First four args in registers, remaining 4 args on stack.
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static constexpr size_t maxFrameExtentForSlowPathCall = 24;
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#elif CPU(MIPS)
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// Though args are in registers, there need to be space on the stack for all args.
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static constexpr size_t maxFrameExtentForSlowPathCall = 40;
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#else
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#error "Unsupported CPU: need value for maxFrameExtentForSlowPathCall"
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#endif
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static_assert(!(maxFrameExtentForSlowPathCall % sizeof(Register)), "Extent must be in multiples of registers");
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#if ENABLE(ASSEMBLER)
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// Make sure that cfr - maxFrameExtentForSlowPathCall bytes will make the stack pointer aligned
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static_assert((maxFrameExtentForSlowPathCall % 16) == 16 - sizeof(CallerFrameAndPC), "Extent must align stack from callframe pointer");
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#endif
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static constexpr size_t maxFrameExtentForSlowPathCallInRegisters = maxFrameExtentForSlowPathCall / sizeof(Register);
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} // namespace JSC
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