3c74dc9f4d
This patch adds two macros to declare per-type allocators: - JS_DECLARE_ALLOCATOR(TypeName) - JS_DEFINE_ALLOCATOR(TypeName) When used, they add a type-specific CellAllocator that the Heap will delegate allocation requests to. The result of this is that GC objects of the same type always end up within the same HeapBlock, drastically reducing the ability to perform type confusion attacks. It also improves HeapBlock utilization, since each block now has cells sized exactly to the type used within that block. (Previously we only had a handful of block sizes available, and most GC allocations ended up with a large amount of slack in their tails.) There is a small performance hit from this, but I'm sure we can make up for it elsewhere. Note that the old size-based allocators still exist, and we fall back to them for any type that doesn't have its own CellAllocator.
107 lines
4.4 KiB
C++
107 lines
4.4 KiB
C++
/*
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* Copyright (c) 2022, Idan Horowitz <idan.horowitz@serenityos.org>
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* Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Runtime/AbstractOperations.h>
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#include <LibJS/Runtime/Array.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/Intl/AbstractOperations.h>
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#include <LibJS/Runtime/Intl/Segmenter.h>
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#include <LibJS/Runtime/Intl/SegmenterConstructor.h>
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#include <LibJS/Runtime/Temporal/AbstractOperations.h>
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namespace JS::Intl {
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JS_DEFINE_ALLOCATOR(SegmenterConstructor);
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// 18.1 The Intl.Segmenter Constructor, https://tc39.es/ecma402/#sec-intl-segmenter-constructor
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SegmenterConstructor::SegmenterConstructor(Realm& realm)
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: NativeFunction(realm.vm().names.Segmenter.as_string(), realm.intrinsics().function_prototype())
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{
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}
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void SegmenterConstructor::initialize(Realm& realm)
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{
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Base::initialize(realm);
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auto& vm = this->vm();
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// 18.2.1 Intl.Segmenter.prototype, https://tc39.es/ecma402/#sec-intl.segmenter.prototype
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define_direct_property(vm.names.prototype, realm.intrinsics().intl_segmenter_prototype(), 0);
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define_direct_property(vm.names.length, Value(0), Attribute::Configurable);
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u8 attr = Attribute::Writable | Attribute::Configurable;
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define_native_function(realm, vm.names.supportedLocalesOf, supported_locales_of, 1, attr);
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}
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// 18.1.1 Intl.Segmenter ( [ locales [ , options ] ] ), https://tc39.es/ecma402/#sec-intl.segmenter
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ThrowCompletionOr<Value> SegmenterConstructor::call()
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{
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// 1. If NewTarget is undefined, throw a TypeError exception.
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return vm().throw_completion<TypeError>(ErrorType::ConstructorWithoutNew, "Intl.Segmenter");
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}
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// 18.1.1 Intl.Segmenter ( [ locales [ , options ] ] ), https://tc39.es/ecma402/#sec-intl.segmenter
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ThrowCompletionOr<NonnullGCPtr<Object>> SegmenterConstructor::construct(FunctionObject& new_target)
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{
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auto& vm = this->vm();
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auto locales = vm.argument(0);
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auto options_value = vm.argument(1);
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// 2. Let internalSlotsList be « [[InitializedSegmenter]], [[Locale]], [[SegmenterGranularity]] ».
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// 3. Let segmenter be ? OrdinaryCreateFromConstructor(NewTarget, "%Segmenter.prototype%", internalSlotsList).
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auto segmenter = TRY(ordinary_create_from_constructor<Segmenter>(vm, new_target, &Intrinsics::intl_segmenter_prototype));
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// 4. Let requestedLocales be ? CanonicalizeLocaleList(locales).
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auto requested_locales = TRY(canonicalize_locale_list(vm, locales));
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// 5. Set options to ? GetOptionsObject(options).
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auto* options = TRY(Temporal::get_options_object(vm, options_value));
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// 6. Let opt be a new Record.
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LocaleOptions opt {};
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// 7. Let matcher be ? GetOption(options, "localeMatcher", string, « "lookup", "best fit" », "best fit").
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auto matcher = TRY(get_option(vm, *options, vm.names.localeMatcher, OptionType::String, { "lookup"sv, "best fit"sv }, "best fit"sv));
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// 8. Set opt.[[localeMatcher]] to matcher.
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opt.locale_matcher = matcher;
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// 9. Let localeData be %Segmenter%.[[LocaleData]].
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// 10. Let r be ResolveLocale(%Segmenter%.[[AvailableLocales]], requestedLocales, opt, %Segmenter%.[[RelevantExtensionKeys]], localeData).
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auto result = resolve_locale(requested_locales, opt, {});
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// 11. Set segmenter.[[Locale]] to r.[[locale]].
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segmenter->set_locale(move(result.locale));
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// 12. Let granularity be ? GetOption(options, "granularity", string, « "grapheme", "word", "sentence" », "grapheme").
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auto granularity = TRY(get_option(vm, *options, vm.names.granularity, OptionType::String, { "grapheme"sv, "word"sv, "sentence"sv }, "grapheme"sv));
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// 13. Set segmenter.[[SegmenterGranularity]] to granularity.
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segmenter->set_segmenter_granularity(granularity.as_string().utf8_string_view());
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// 14. Return segmenter.
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return segmenter;
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}
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// 18.2.2 Intl.Segmenter.supportedLocalesOf ( locales [ , options ] ), https://tc39.es/ecma402/#sec-intl.segmenter.supportedlocalesof
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JS_DEFINE_NATIVE_FUNCTION(SegmenterConstructor::supported_locales_of)
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{
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auto locales = vm.argument(0);
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auto options = vm.argument(1);
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// 1. Let availableLocales be %Segmenter%.[[AvailableLocales]].
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// 2. Let requestedLocales be ? CanonicalizeLocaleList(locales).
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auto requested_locales = TRY(canonicalize_locale_list(vm, locales));
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// 3. Return ? SupportedLocales(availableLocales, requestedLocales, options).
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return TRY(supported_locales(vm, requested_locales, options));
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}
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}
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