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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.
80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2022, 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/DeprecatedString.h>
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#include <AK/Optional.h>
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#include <AK/String.h>
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#include <AK/StringView.h>
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#include <LibJS/Forward.h>
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#include <LibJS/Heap/Cell.h>
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#include <LibJS/Heap/CellAllocator.h>
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#include <LibJS/Runtime/Completion.h>
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#include <LibJS/Runtime/Utf16String.h>
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#include <LibJS/Runtime/Value.h>
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namespace JS {
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class PrimitiveString final : public Cell {
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JS_CELL(PrimitiveString, Cell);
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JS_DECLARE_ALLOCATOR(PrimitiveString);
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public:
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[[nodiscard]] static NonnullGCPtr<PrimitiveString> create(VM&, Utf16String);
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[[nodiscard]] static NonnullGCPtr<PrimitiveString> create(VM&, String);
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[[nodiscard]] static NonnullGCPtr<PrimitiveString> create(VM&, FlyString const&);
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[[nodiscard]] static NonnullGCPtr<PrimitiveString> create(VM&, DeprecatedString);
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[[nodiscard]] static NonnullGCPtr<PrimitiveString> create(VM&, DeprecatedFlyString const&);
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[[nodiscard]] static NonnullGCPtr<PrimitiveString> create(VM&, PrimitiveString&, PrimitiveString&);
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[[nodiscard]] static NonnullGCPtr<PrimitiveString> create(VM&, StringView);
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virtual ~PrimitiveString();
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PrimitiveString(PrimitiveString const&) = delete;
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PrimitiveString& operator=(PrimitiveString const&) = delete;
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bool is_empty() const;
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[[nodiscard]] String utf8_string() const;
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[[nodiscard]] StringView utf8_string_view() const;
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bool has_utf8_string() const { return m_utf8_string.has_value(); }
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[[nodiscard]] DeprecatedString deprecated_string() const;
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bool has_deprecated_string() const { return m_deprecated_string.has_value(); }
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[[nodiscard]] Utf16String utf16_string() const;
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[[nodiscard]] Utf16View utf16_string_view() const;
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bool has_utf16_string() const { return m_utf16_string.has_value(); }
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ThrowCompletionOr<Optional<Value>> get(VM&, PropertyKey const&) const;
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private:
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explicit PrimitiveString(PrimitiveString&, PrimitiveString&);
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explicit PrimitiveString(String);
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explicit PrimitiveString(DeprecatedString);
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explicit PrimitiveString(Utf16String);
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virtual void visit_edges(Cell::Visitor&) override;
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enum class EncodingPreference {
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UTF8,
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UTF16,
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};
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void resolve_rope_if_needed(EncodingPreference) const;
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mutable bool m_is_rope { false };
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mutable GCPtr<PrimitiveString> m_lhs;
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mutable GCPtr<PrimitiveString> m_rhs;
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mutable Optional<String> m_utf8_string;
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mutable Optional<DeprecatedString> m_deprecated_string;
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mutable Optional<Utf16String> m_utf16_string;
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};
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}
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