c78506d79b
Instead of trying to keep a live reference to the bytecode interpreter's current instruction stream iterator, we now simply copy the current iterator whenever pushing to the ExecutionContext stack. This fixes a stack-use-after-return issue reported by ASAN.
59 lines
2.1 KiB
C++
59 lines
2.1 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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* Copyright (c) 2022, Luke Wilde <lukew@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/DeprecatedFlyString.h>
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#include <AK/WeakPtr.h>
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#include <LibJS/Bytecode/Instruction.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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#include <LibJS/SourceRange.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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[[nodiscard]] ExecutionContext copy() const;
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void visit_edges(Cell::Visitor&);
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private:
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explicit ExecutionContext(MarkedVector<Value> existing_arguments, MarkedVector<Value> existing_local_variables);
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public:
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GCPtr<FunctionObject> function; // [[Function]]
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GCPtr<Realm> realm; // [[Realm]]
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ScriptOrModule script_or_module; // [[ScriptOrModule]]
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GCPtr<Environment> lexical_environment; // [[LexicalEnvironment]]
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GCPtr<Environment> variable_environment; // [[VariableEnvironment]]
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GCPtr<PrivateEnvironment> private_environment; // [[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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GCPtr<Cell> context_owner;
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Optional<Bytecode::InstructionStreamIterator> instruction_stream_iterator;
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DeprecatedFlyString function_name;
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Value this_value;
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MarkedVector<Value> arguments;
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MarkedVector<Value> local_variables;
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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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