1/* 2 * Copyright (C) 2013 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef MaxFrameExtentForSlowPathCall_h 27#define MaxFrameExtentForSlowPathCall_h 28 29#include "JSStack.h" 30#include "Register.h" 31#include "StackAlignment.h" 32#include <wtf/Assertions.h> 33 34namespace JSC { 35 36// The maxFrameExtentForSlowPathCall is the max amount of stack space (in bytes) 37// that can be used for outgoing args when calling a slow path C function 38// from JS code. 39 40#if !ENABLE(JIT) 41static const size_t maxFrameExtentForSlowPathCall = 0; 42 43#elif CPU(X86_64) && OS(WINDOWS) 44// 4 args in registers, but stack space needs to be allocated for all args. 45static const size_t maxFrameExtentForSlowPathCall = 64; 46 47#elif CPU(X86_64) 48// All args in registers. 49static const size_t maxFrameExtentForSlowPathCall = 0; 50 51#elif CPU(X86) 52// 7 args on stack (28 bytes). 53static const size_t maxFrameExtentForSlowPathCall = 40; 54 55#elif CPU(ARM64) 56// All args in registers. 57static const size_t maxFrameExtentForSlowPathCall = 0; 58 59#elif CPU(ARM) 60// First four args in registers, remaining 4 args on stack. 61static const size_t maxFrameExtentForSlowPathCall = 24; 62 63#elif CPU(SH4) 64// First four args in registers, remaining 4 args on stack. 65static const size_t maxFrameExtentForSlowPathCall = 24; 66 67#elif CPU(MIPS) 68// Though args are in registers, there need to be space on the stack for all args. 69static const size_t maxFrameExtentForSlowPathCall = 40; 70 71#else 72#error "Unsupported CPU: need value for maxFrameExtentForSlowPathCall" 73 74#endif 75 76COMPILE_ASSERT(!(maxFrameExtentForSlowPathCall % sizeof(Register)), extent_must_be_in_multiples_of_registers); 77 78#if ENABLE(JIT) 79// Make sure that cfr - maxFrameExtentForSlowPathCall bytes will make the stack pointer aligned 80COMPILE_ASSERT((maxFrameExtentForSlowPathCall % 16) == 16 - sizeof(CallerFrameAndPC), extent_must_align_stack_from_callframe_pointer); 81#endif 82 83static const size_t maxFrameExtentForSlowPathCallInRegisters = maxFrameExtentForSlowPathCall / sizeof(Register); 84 85} // namespace JSC 86 87#endif // MaxFrameExtentForSlowPathCall_h 88 89