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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
tree | f435a8308119effd964b339f76abb83a57c29483 /js/public/shadow/Object.h | |
parent | Initial commit. (diff) | |
download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | js/public/shadow/Object.h | 67 |
1 files changed, 67 insertions, 0 deletions
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 <stddef.h> // 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<uintptr_t>(this); + return reinterpret_cast<JS::Value*>(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 |