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LibJS: Store ECMAScriptFunctionObject bytecode in an OwnPtr

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Using an Optional was extremely wasteful for function objects that don't
even have a bytecode executable.

This allows ECMAScriptFunctionObject to fit in a smaller size class.
This commit is contained in:
Andreas Kling 2022-01-31 13:25:39 +01:00
parent 8d3f92c844
commit 7a742b17da
8 changed files with 33 additions and 28 deletions
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6
Userland/Libraries/LibJS/Runtime/AbstractOperations.cpp
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@ -580,10 +580,10 @@ ThrowCompletionOr<Value> perform_eval(Value x, GlobalObject& caller_realm, Calle
if (auto* bytecode_interpreter = Bytecode::Interpreter::current()) {
auto executable = JS::Bytecode::Generator::generate(program);
executable.name = "eval"sv;
executable->name = "eval"sv;
if (JS::Bytecode::g_dump_bytecode)
executable.dump();
eval_result = TRY(bytecode_interpreter->run(executable));
executable->dump();
eval_result = TRY(bytecode_interpreter->run(*executable));
// Turn potentially empty JS::Value from the bytecode interpreter into an empty Optional
if (eval_result.has_value() && eval_result->is_empty())
eval_result = {};

2
Userland/Libraries/LibJS/Runtime/ECMAScriptFunctionObject.cpp
View file

@ -775,7 +775,7 @@ Completion ECMAScriptFunctionObject::ordinary_call_evaluate_body()
if (bytecode_interpreter) {
// FIXME: pass something to evaluate default arguments with
TRY(function_declaration_instantiation(nullptr));
if (!m_bytecode_executable.has_value()) {
if (!m_bytecode_executable) {
m_bytecode_executable = Bytecode::Generator::generate(m_ecmascript_code, m_kind);
m_bytecode_executable->name = m_name;
auto& passes = JS::Bytecode::Interpreter::optimization_pipeline();

2
Userland/Libraries/LibJS/Runtime/ECMAScriptFunctionObject.h
View file

@ -103,7 +103,7 @@ private:
ThrowCompletionOr<void> function_declaration_instantiation(Interpreter*);
FlyString m_name;
Optional<Bytecode::Executable> m_bytecode_executable;
OwnPtr<Bytecode::Executable> m_bytecode_executable;
i32 m_function_length { 0 };
// Internal Slots of ECMAScript Function Objects, https://tc39.es/ecma262/#table-internal-slots-of-ecmascript-function-objects