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.
55 lines
2.5 KiB
C++
55 lines
2.5 KiB
C++
/*
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* Copyright (c) 2021-2023, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2022, David Tuin <davidot@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 <LibJS/CyclicModule.h>
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#include <LibJS/Forward.h>
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#include <LibJS/Runtime/ExecutionContext.h>
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namespace JS {
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// 16.2.1.6 Source Text Module Records, https://tc39.es/ecma262/#sec-source-text-module-records
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class SourceTextModule final : public CyclicModule {
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JS_CELL(SourceTextModule, CyclicModule);
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JS_DECLARE_ALLOCATOR(SourceTextModule);
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public:
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static Result<NonnullGCPtr<SourceTextModule>, Vector<ParserError>> parse(StringView source_text, Realm&, StringView filename = {}, Script::HostDefined* host_defined = nullptr);
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Program const& parse_node() const { return *m_ecmascript_code; }
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virtual ThrowCompletionOr<Vector<DeprecatedFlyString>> get_exported_names(VM& vm, Vector<Module*> export_star_set) override;
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virtual ThrowCompletionOr<ResolvedBinding> resolve_export(VM& vm, DeprecatedFlyString const& export_name, Vector<ResolvedBinding> resolve_set = {}) override;
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Object* import_meta() { return m_import_meta; }
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void set_import_meta(Badge<VM>, Object* import_meta) { m_import_meta = import_meta; }
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protected:
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virtual ThrowCompletionOr<void> initialize_environment(VM& vm) override;
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virtual ThrowCompletionOr<void> execute_module(VM& vm, GCPtr<PromiseCapability> capability) override;
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private:
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SourceTextModule(Realm&, StringView filename, Script::HostDefined* host_defined, bool has_top_level_await, NonnullRefPtr<Program> body, Vector<ModuleRequest> requested_modules,
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Vector<ImportEntry> import_entries, Vector<ExportEntry> local_export_entries,
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Vector<ExportEntry> indirect_export_entries, Vector<ExportEntry> star_export_entries,
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RefPtr<ExportStatement const> default_export);
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virtual void visit_edges(Cell::Visitor&) override;
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NonnullRefPtr<Program> m_ecmascript_code; // [[ECMAScriptCode]]
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ExecutionContext m_execution_context; // [[Context]]
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GCPtr<Object> m_import_meta; // [[ImportMeta]]
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Vector<ImportEntry> m_import_entries; // [[ImportEntries]]
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Vector<ExportEntry> m_local_export_entries; // [[LocalExportEntries]]
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Vector<ExportEntry> m_indirect_export_entries; // [[IndirectExportEntries]]
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Vector<ExportEntry> m_star_export_entries; // [[StarExportEntries]]
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RefPtr<ExportStatement const> m_default_export; // Note: Not from the spec
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};
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}
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