From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- js/public/shadow/Object.h | 67 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 js/public/shadow/Object.h (limited to 'js/public/shadow/Object.h') diff --git a/js/public/shadow/Object.h b/js/public/shadow/Object.h new file mode 100644 index 0000000000..6f77de71ba --- /dev/null +++ b/js/public/shadow/Object.h @@ -0,0 +1,67 @@ +/* -*- 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/. */ + +/* + * Shadow definition of |JSObject| innards. (|js::NativeObject| is more + * accurate, but portions can sometimes be used in some non-native objects.) Do + * not use this directly! + */ + +#ifndef js_shadow_Object_h +#define js_shadow_Object_h + +#include // size_t + +#include "js/shadow/Shape.h" // JS::shadow::Shape +#include "js/Value.h" // JS::Value + +class JS_PUBLIC_API JSObject; + +namespace JS { + +class JS_PUBLIC_API Value; + +namespace shadow { + +/** + * This layout is shared by all native objects. For non-native objects, the + * shape may always be accessed safely, and other members may be as well, + * depending on the object's specific layout. + */ +struct Object { + shadow::Shape* shape; +#ifndef JS_64BIT + uint32_t padding_; +#endif + Value* slots; + void* _1; + + static constexpr size_t MAX_FIXED_SLOTS = 16; + + size_t numFixedSlots() const { + return (shape->immutableFlags & shadow::Shape::FIXED_SLOTS_MASK) >> + shadow::Shape::FIXED_SLOTS_SHIFT; + } + + Value* fixedSlots() const { + auto address = reinterpret_cast(this); + return reinterpret_cast(address + sizeof(shadow::Object)); + } + + Value& slotRef(size_t slot) const { + size_t nfixed = numFixedSlots(); + if (slot < nfixed) { + return fixedSlots()[slot]; + } + return slots[slot - nfixed]; + } +}; + +} // namespace shadow + +} // namespace JS + +#endif // js_shadow_Object_h -- cgit v1.2.3