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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /js/public/shadow/Object.h
parentInitial commit. (diff)
downloadfirefox-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 'js/public/shadow/Object.h')
-rw-r--r--js/public/shadow/Object.h67
1 files changed, 67 insertions, 0 deletions
diff --git a/js/public/shadow/Object.h b/js/public/shadow/Object.h
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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/. */
+
+/*
+ * 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