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https://github.com/LadybirdBrowser/ladybird.git
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3cf50539ec
The special empty value (that we use for array holes, Optional<Value> when empty and a few other other placeholder/sentinel tasks) still exists, but you now create one via JS::js_special_empty_value() and check for it with Value::is_special_empty_value(). The main idea here is to make it very unlikely to accidentally create an unexpected special empty value.
102 lines
2.9 KiB
C++
102 lines
2.9 KiB
C++
/*
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* Copyright (c) 2020-2024, Andreas Kling <andreas@ladybird.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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#include <LibGC/Heap.h>
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#include <LibJS/Bytecode/Executable.h>
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#include <LibJS/Runtime/ExecutionContext.h>
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#include <LibJS/Runtime/FunctionObject.h>
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namespace JS {
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class ExecutionContextAllocator {
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public:
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NonnullOwnPtr<ExecutionContext> allocate()
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{
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if (m_execution_contexts.is_empty())
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return adopt_own(*new ExecutionContext);
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void* slot = m_execution_contexts.take_last();
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return adopt_own(*new (slot) ExecutionContext);
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}
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void deallocate(void* ptr)
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{
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m_execution_contexts.append(ptr);
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}
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private:
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Vector<void*> m_execution_contexts;
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};
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static NeverDestroyed<ExecutionContextAllocator> s_execution_context_allocator;
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NonnullOwnPtr<ExecutionContext> ExecutionContext::create()
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{
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return s_execution_context_allocator->allocate();
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}
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void ExecutionContext::operator delete(void* ptr)
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{
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s_execution_context_allocator->deallocate(ptr);
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}
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ExecutionContext::ExecutionContext()
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{
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}
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ExecutionContext::~ExecutionContext()
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{
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}
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NonnullOwnPtr<ExecutionContext> ExecutionContext::copy() const
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{
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auto copy = create();
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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->program_counter = program_counter;
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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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copy->executable = executable;
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copy->arguments = arguments;
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copy->passed_argument_count = passed_argument_count;
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copy->registers_and_constants_and_locals = registers_and_constants_and_locals;
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copy->unwind_contexts = unwind_contexts;
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copy->saved_lexical_environments = saved_lexical_environments;
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copy->previously_scheduled_jumps = previously_scheduled_jumps;
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return copy;
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}
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void ExecutionContext::visit_edges(Cell::Visitor& visitor)
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{
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visitor.visit(function);
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visitor.visit(realm);
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visitor.visit(variable_environment);
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visitor.visit(lexical_environment);
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visitor.visit(private_environment);
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visitor.visit(context_owner);
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if (this_value.has_value())
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visitor.visit(*this_value);
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visitor.visit(executable);
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visitor.visit(function_name);
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visitor.visit(arguments);
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visitor.visit(registers_and_constants_and_locals);
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for (auto& context : unwind_contexts) {
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visitor.visit(context.lexical_environment);
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}
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visitor.visit(saved_lexical_environments);
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script_or_module.visit(
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[](Empty) {},
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[&](auto& script_or_module) {
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visitor.visit(script_or_module);
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});
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}
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}
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