/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef js_public_NativeStackLimit_h
#define js_public_NativeStackLimit_h
#include "mozilla/Assertions.h" // MOZ_ASSERT
#include <stddef.h>
// size_t
#include <stdint.h>
// uint32_t, uintptr_t, UINTPTR_MAX
#include <utility>
// std::move
namespace JS {
using NativeStackSize = size_t;
using NativeStackBase = uintptr_t;
using NativeStackLimit = uintptr_t;
#if JS_STACK_GROWTH_DIRECTION >
0
constexpr NativeStackLimit NativeStackLimitMin =
0;
constexpr NativeStackLimit NativeStackLimitMax = UINTPTR_MAX;
#else
constexpr NativeStackLimit NativeStackLimitMin = UINTPTR_MAX;
constexpr NativeStackLimit NativeStackLimitMax =
0;
#endif
#ifdef __wasi__
// We build with the "stack-first" wasm-ld option, so the stack grows downward
// toward zero. Let's set a limit just a bit above this so that we catch an
// overflow before a Wasm trap occurs.
constexpr NativeStackLimit WASINativeStackLimit =
1024;
#endif // __wasi__
inline NativeStackLimit GetNativeStackLimit(NativeStackBase base,
NativeStackSize size) {
#if JS_STACK_GROWTH_DIRECTION >
0
MOZ_ASSERT(base <= size_t(-
1) - size);
return base + size -
1;
#else // stack grows up
MOZ_ASSERT(base >= size);
return base - (size -
1);
#endif // stack grows down
}
}
// namespace JS
#endif /* js_public_NativeStackLimit_h */
