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/* -*- 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 */
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