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/*
* Copyright (C) 2013, 2016 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 "Register.h"
#include "StackAlignment.h"
#include <wtf/Assertions.h>
namespace JSC {
// The maxFrameExtentForSlowPathCall is the max amount of stack space (in bytes)
// that can be used for outgoing args when calling a slow path C function
// from JS code.
#if !ENABLE(ASSEMBLER)
static constexpr size_t maxFrameExtentForSlowPathCall = 0;
#elif CPU(X86_64) && OS(WINDOWS)
// 4 args in registers, but stack space needs to be allocated for all args.
static constexpr size_t maxFrameExtentForSlowPathCall = 64;
#elif CPU(X86_64)
// All args in registers.
static constexpr size_t maxFrameExtentForSlowPathCall = 0;
#elif CPU(X86)
// 7 args on stack (28 bytes).
static constexpr size_t maxFrameExtentForSlowPathCall = 40;
#elif CPU(ARM64) || CPU(ARM64E) || CPU(RISCV64)
// All args in registers.
static constexpr size_t maxFrameExtentForSlowPathCall = 0;
#elif CPU(ARM)
// First four args in registers, remaining 4 args on stack.
static constexpr size_t maxFrameExtentForSlowPathCall = 24;
#elif CPU(MIPS)
// Though args are in registers, there need to be space on the stack for all args.
static constexpr size_t maxFrameExtentForSlowPathCall = 40;
#else
#error "Unsupported CPU: need value for maxFrameExtentForSlowPathCall"
#endif
static_assert(!(maxFrameExtentForSlowPathCall % sizeof(Register)), "Extent must be in multiples of registers");
#if ENABLE(ASSEMBLER)
// Make sure that cfr - maxFrameExtentForSlowPathCall bytes will make the stack pointer aligned
static_assert((maxFrameExtentForSlowPathCall % 16) == 16 - sizeof(CallerFrameAndPC), "Extent must align stack from callframe pointer");
#endif
static constexpr size_t maxFrameExtentForSlowPathCallInRegisters = maxFrameExtentForSlowPathCall / sizeof(Register);
} // namespace JSC
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