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 --- dom/bindings/ProxyHandlerUtils.h | 62 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 dom/bindings/ProxyHandlerUtils.h (limited to 'dom/bindings/ProxyHandlerUtils.h') diff --git a/dom/bindings/ProxyHandlerUtils.h b/dom/bindings/ProxyHandlerUtils.h new file mode 100644 index 0000000000..b9a9e4a579 --- /dev/null +++ b/dom/bindings/ProxyHandlerUtils.h @@ -0,0 +1,62 @@ +/* -*- 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 mozilla_dom_ProxyHandlerUtils_h +#define mozilla_dom_ProxyHandlerUtils_h + +#include "mozilla/Likely.h" +#include "mozilla/Maybe.h" +#include "mozilla/TextUtils.h" + +#include "js/Id.h" +#include "js/Object.h" // JS::GetClass +#include "js/PropertyDescriptor.h" +#include "js/String.h" // JS::AtomToLinearString, JS::GetLinearString{CharAt,Length} +#include "js/TypeDecls.h" + +#include "jsfriendapi.h" // js::StringIsArrayIndex + +namespace mozilla::dom { + +extern jsid s_length_id; + +// A return value of UINT32_MAX indicates "not an array index". Note, in +// particular, that UINT32_MAX itself is not a valid array index in general. +inline uint32_t GetArrayIndexFromId(JS::Handle id) { + // Much like js::IdIsIndex, except with a fast path for "length" and another + // fast path for starting with a lowercase ascii char. Is that second one + // really needed? I guess it is because StringIsArrayIndex is out of line... + // as of now, use id.get() instead of id otherwise operands mismatch error + // occurs. + if (MOZ_LIKELY(id.isInt())) { + return id.toInt(); + } + if (MOZ_LIKELY(id.get() == s_length_id)) { + return UINT32_MAX; + } + if (MOZ_UNLIKELY(!id.isAtom())) { + return UINT32_MAX; + } + + JSLinearString* str = JS::AtomToLinearString(id.toAtom()); + if (MOZ_UNLIKELY(JS::GetLinearStringLength(str) == 0)) { + return UINT32_MAX; + } + + char16_t firstChar = JS::GetLinearStringCharAt(str, 0); + if (MOZ_LIKELY(IsAsciiLowercaseAlpha(firstChar))) { + return UINT32_MAX; + } + + uint32_t i; + return js::StringIsArrayIndex(str, &i) ? i : UINT32_MAX; +} + +inline bool IsArrayIndex(uint32_t index) { return index < UINT32_MAX; } + +} // namespace mozilla::dom + +#endif /* mozilla_dom_ProxyHandlerUtils_h */ -- cgit v1.2.3