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