849499988e
We can't be nuking the ESO while its owned execution context is still on the VM's execution context stack, as that may lead to a use-after-free. This patch solves this by adding a `context_owner` field to each context and treating it as a GC root.
75 lines
2.4 KiB
C++
75 lines
2.4 KiB
C++
/*
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* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2020-2021, 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/FlyString.h>
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#include <AK/WeakPtr.h>
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#include <LibJS/Forward.h>
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#include <LibJS/Heap/MarkedVector.h>
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#include <LibJS/Module.h>
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#include <LibJS/Runtime/PrivateEnvironment.h>
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#include <LibJS/Runtime/Value.h>
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namespace JS {
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using ScriptOrModule = Variant<Empty, NonnullGCPtr<Script>, NonnullGCPtr<Module>>;
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// 9.4 Execution Contexts, https://tc39.es/ecma262/#sec-execution-contexts
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struct ExecutionContext {
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explicit ExecutionContext(Heap& heap)
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: arguments(heap)
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{
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}
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[[nodiscard]] ExecutionContext copy() const
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{
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ExecutionContext copy { arguments };
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copy.function = function;
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copy.realm = realm;
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copy.script_or_module = script_or_module;
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copy.lexical_environment = lexical_environment;
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copy.variable_environment = variable_environment;
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copy.private_environment = private_environment;
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copy.current_node = current_node;
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copy.function_name = function_name;
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copy.this_value = this_value;
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copy.is_strict_mode = is_strict_mode;
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return copy;
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}
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private:
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explicit ExecutionContext(MarkedVector<Value> existing_arguments)
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: arguments(move(existing_arguments))
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{
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}
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public:
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FunctionObject* function { nullptr }; // [[Function]]
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Realm* realm { nullptr }; // [[Realm]]
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ScriptOrModule script_or_module; // [[ScriptOrModule]]
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Environment* lexical_environment { nullptr }; // [[LexicalEnvironment]]
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Environment* variable_environment { nullptr }; // [[VariableEnvironment]]
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PrivateEnvironment* private_environment { nullptr }; // [[PrivateEnvironment]]
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// Non-standard: This points at something that owns this ExecutionContext, in case it needs to be protected from GC.
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Cell* context_owner { nullptr };
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ASTNode const* current_node { nullptr };
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FlyString function_name;
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Value this_value;
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MarkedVector<Value> arguments;
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bool is_strict_mode { false };
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// https://html.spec.whatwg.org/multipage/webappapis.html#skip-when-determining-incumbent-counter
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// FIXME: Move this out of LibJS (e.g. by using the CustomData concept), as it's used exclusively by LibWeb.
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size_t skip_when_determining_incumbent_counter { 0 };
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};
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}
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