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https://github.com/RGBCube/serenity
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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.
57 lines
2.9 KiB
C++
57 lines
2.9 KiB
C++
/*
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* Copyright (c) 2021-2023, Linus Groh <linusg@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Optional.h>
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#include <LibJS/Heap/MarkedVector.h>
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#include <LibJS/Runtime/Object.h>
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#include <LibJS/Runtime/Temporal/AbstractOperations.h>
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namespace JS::Temporal {
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class TimeZone final : public Object {
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JS_OBJECT(TimeZone, Object);
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JS_DECLARE_ALLOCATOR(TimeZone);
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public:
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// Needs to store values in the range -8.64 * 10^13 to 8.64 * 10^13
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using OffsetType = double;
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virtual ~TimeZone() override = default;
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[[nodiscard]] String const& identifier() const { return m_identifier; }
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[[nodiscard]] Optional<OffsetType> const& offset_nanoseconds() const { return m_offset_nanoseconds; }
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void set_identifier(String identifier) { m_identifier = move(identifier); }
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void set_offset_nanoseconds(OffsetType offset_nanoseconds) { m_offset_nanoseconds = offset_nanoseconds; }
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private:
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explicit TimeZone(Object& prototype);
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// 11.5 Properties of Temporal.TimeZone Instances, https://tc39.es/proposal-temporal/#sec-properties-of-temporal-timezone-instances
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String m_identifier; // [[Identifier]]
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Optional<OffsetType> m_offset_nanoseconds; // [[OffsetNanoseconds]]
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};
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bool is_available_time_zone_name(StringView time_zone);
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ThrowCompletionOr<String> canonicalize_time_zone_name(VM&, StringView time_zone);
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ThrowCompletionOr<TimeZone*> create_temporal_time_zone(VM&, StringView identifier, FunctionObject const* new_target = nullptr);
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ISODateTime get_iso_parts_from_epoch(VM&, Crypto::SignedBigInteger const& epoch_nanoseconds);
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BigInt* get_named_time_zone_next_transition(VM&, StringView time_zone_identifier, BigInt const& epoch_nanoseconds);
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BigInt* get_named_time_zone_previous_transition(VM&, StringView time_zone_identifier, BigInt const& epoch_nanoseconds);
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ThrowCompletionOr<String> format_time_zone_offset_string(VM&, double offset_nanoseconds);
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ThrowCompletionOr<String> format_iso_time_zone_offset_string(VM&, double offset_nanoseconds);
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ThrowCompletionOr<Object*> to_temporal_time_zone(VM&, Value temporal_time_zone_like);
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ThrowCompletionOr<double> get_offset_nanoseconds_for(VM&, Value time_zone, Instant&);
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ThrowCompletionOr<String> builtin_time_zone_get_offset_string_for(VM&, Value time_zone, Instant&);
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ThrowCompletionOr<PlainDateTime*> builtin_time_zone_get_plain_date_time_for(VM&, Value time_zone, Instant&, Object& calendar);
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ThrowCompletionOr<Instant*> builtin_time_zone_get_instant_for(VM&, Value time_zone, PlainDateTime&, StringView disambiguation);
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ThrowCompletionOr<Instant*> disambiguate_possible_instants(VM&, MarkedVector<Instant*> const& possible_instants, Value time_zone, PlainDateTime&, StringView disambiguation);
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ThrowCompletionOr<MarkedVector<Instant*>> get_possible_instants_for(VM&, Value time_zone, PlainDateTime&);
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ThrowCompletionOr<bool> time_zone_equals(VM&, Object& one, Object& two);
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}
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