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.
91 lines
3.7 KiB
C++
91 lines
3.7 KiB
C++
/*
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* Copyright (c) 2022, David Tuin <davidot@serenityos.org>
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* Copyright (c) 2023, networkException <networkexception@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/Forward.h>
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#include <LibJS/Module.h>
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namespace JS {
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enum class ModuleStatus {
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New,
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Unlinked,
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Linking,
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Linked,
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Evaluating,
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EvaluatingAsync,
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Evaluated
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};
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class CyclicModule;
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// https://tc39.es/ecma262/#graphloadingstate-record
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struct GraphLoadingState {
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struct HostDefined {
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virtual ~HostDefined() = default;
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virtual void visit_edges(Cell::Visitor&) { }
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};
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GCPtr<PromiseCapability> promise_capability; // [[PromiseCapability]]
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bool is_loading { false }; // [[IsLoading]]
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size_t pending_module_count { 0 }; // [[PendingModulesCount]]
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HashTable<CyclicModule*> visited; // [[Visited]]
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Optional<HostDefined> host_defined; // [[HostDefined]]
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};
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// 16.2.1.5 Cyclic Module Records, https://tc39.es/ecma262/#cyclic-module-record
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class CyclicModule : public Module {
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JS_CELL(CyclicModule, Module);
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JS_DECLARE_ALLOCATOR(CyclicModule);
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public:
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// Note: Do not call these methods directly unless you are HostResolveImportedModule.
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// Badges cannot be used because other hosts must be able to call this (and it is called recursively)
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virtual ThrowCompletionOr<void> link(VM& vm) override final;
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virtual ThrowCompletionOr<Promise*> evaluate(VM& vm) override final;
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virtual PromiseCapability& load_requested_modules(Realm&, Optional<GraphLoadingState::HostDefined>);
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virtual void inner_module_loading(GraphLoadingState& state);
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Vector<ModuleRequest> const& requested_modules() const { return m_requested_modules; }
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Vector<ModuleWithSpecifier> const& loaded_modules() const { return m_loaded_modules; }
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protected:
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CyclicModule(Realm& realm, StringView filename, bool has_top_level_await, Vector<ModuleRequest> requested_modules, Script::HostDefined* host_defined);
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virtual void visit_edges(Cell::Visitor&) override;
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virtual ThrowCompletionOr<u32> inner_module_linking(VM& vm, Vector<Module*>& stack, u32 index) override final;
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virtual ThrowCompletionOr<u32> inner_module_evaluation(VM& vm, Vector<Module*>& stack, u32 index) override final;
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virtual ThrowCompletionOr<void> initialize_environment(VM& vm);
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virtual ThrowCompletionOr<void> execute_module(VM& vm, GCPtr<PromiseCapability> capability = {});
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void execute_async_module(VM& vm);
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void gather_available_ancestors(Vector<CyclicModule*>& exec_list);
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void async_module_execution_fulfilled(VM& vm);
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void async_module_execution_rejected(VM& vm, Value error);
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ModuleStatus m_status { ModuleStatus::Unlinked }; // [[Status]]
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ThrowCompletionOr<void> m_evaluation_error; // [[EvaluationError]]
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Optional<u32> m_dfs_index; // [[DFSIndex]]
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Optional<u32> m_dfs_ancestor_index; // [[DFSAncestorIndex]]
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Vector<ModuleRequest> m_requested_modules; // [[RequestedModules]]
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Vector<ModuleWithSpecifier> m_loaded_modules; // [[LoadedModules]]
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GCPtr<CyclicModule> m_cycle_root; // [[CycleRoot]]
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bool m_has_top_level_await { false }; // [[HasTLA]]
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bool m_async_evaluation { false }; // [[AsyncEvaluation]]
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GCPtr<PromiseCapability> m_top_level_capability; // [[TopLevelCapability]]
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Vector<GCPtr<CyclicModule>> m_async_parent_modules; // [[AsyncParentModules]]
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Optional<u32> m_pending_async_dependencies; // [[PendingAsyncDependencies]]
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};
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void continue_module_loading(Realm&, GraphLoadingState& state, ThrowCompletionOr<Module*> const&);
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}
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