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https://github.com/LadybirdBrowser/ladybird.git
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865e651a7d
Before this change both ExecutionContext and CallFrame were created before executing function/module/script with a couple exceptions: - executable created for default function argument evaluation has to run in function's execution context. - `execute_ast_node()` where executable compiled for ASTNode has to be executed in running execution context. This change moves all members previously owned by CallFrame into ExecutionContext, and makes two exceptions where an executable that does not have a corresponding execution context saves and restores registers before running. Now, all execution state lives in a single entity, which makes it a bit easier to reason about and opens opportunities for optimizations, such as moving registers and local variables into a single array.
80 lines
2.4 KiB
C++
80 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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* 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 <LibJS/Bytecode/Executable.h>
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#include <LibJS/Heap/Heap.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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NonnullOwnPtr<ExecutionContext> ExecutionContext::create(Heap& heap)
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{
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return adopt_own(*new ExecutionContext(heap));
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}
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ExecutionContext::ExecutionContext(Heap& heap)
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: m_heap(heap)
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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(m_heap);
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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->instruction_stream_iterator = instruction_stream_iterator;
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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->locals = locals;
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copy->registers = registers;
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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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visitor.visit(this_value);
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visitor.visit(executable);
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if (instruction_stream_iterator.has_value())
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visitor.visit(const_cast<Bytecode::Executable*>(instruction_stream_iterator.value().executable()));
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visitor.visit(function_name);
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visitor.visit(arguments);
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visitor.visit(locals);
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visitor.visit(registers);
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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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