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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
Notes: sideshowbarker 2024-07-17 19:55:50 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/7a742b17da1
8 changed files with 33 additions and 28 deletions
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20
Tests/LibJS/test-bytecode-js.cpp
View File

@ -24,17 +24,17 @@
#define EXPECT_NO_EXCEPTION(executable) \
auto executable = JS::Bytecode::Generator::generate(program); \
auto result = bytecode_interpreter.run(executable); \
auto result = bytecode_interpreter.run(*executable); \
EXPECT(!result.is_error()); \
EXPECT(!vm->exception());
#define EXPECT_NO_EXCEPTION_WITH_OPTIMIZATIONS(executable) \
auto& passes = JS::Bytecode::Interpreter::optimization_pipeline(); \
passes.perform(executable); \
\
auto result_with_optimizations = bytecode_interpreter.run(executable); \
\
EXPECT(!result_with_optimizations.is_error()); \
#define EXPECT_NO_EXCEPTION_WITH_OPTIMIZATIONS(executable) \
auto& passes = JS::Bytecode::Interpreter::optimization_pipeline(); \
passes.perform(*executable); \
\
auto result_with_optimizations = bytecode_interpreter.run(*executable); \
\
EXPECT(!result_with_optimizations.is_error()); \
EXPECT(!vm->exception())
#define EXPECT_NO_EXCEPTION_ALL(source) \
@ -57,7 +57,7 @@ TEST_CASE(if_statement_fail)
SETUP_AND_PARSE("if (true) throw new Exception('failed');");
auto executable = JS::Bytecode::Generator::generate(program);
auto result = bytecode_interpreter.run(executable);
auto result = bytecode_interpreter.run(*executable);
EXPECT(result.is_error());
}
@ -115,7 +115,7 @@ TEST_CASE(loading_multiple_files)
auto const& test_file_program = test_file_script->parse_node();
auto executable = JS::Bytecode::Generator::generate(test_file_program);
auto result = bytecode_interpreter.run(executable);
auto result = bytecode_interpreter.run(*executable);
EXPECT(!result.is_error());
EXPECT(!vm->exception());
}

9
Userland/Libraries/LibJS/Bytecode/Generator.cpp
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@ -23,7 +23,7 @@ Generator::~Generator()
{
}
Executable Generator::generate(ASTNode const& node, FunctionKind enclosing_function_kind)
NonnullOwnPtr<Executable> Generator::generate(ASTNode const& node, FunctionKind enclosing_function_kind)
{
Generator generator;
generator.switch_to_basic_block(generator.make_block());
@ -45,7 +45,12 @@ Executable Generator::generate(ASTNode const& node, FunctionKind enclosing_funct
generator.emit<Bytecode::Op::Yield>(nullptr);
}
}
return { {}, move(generator.m_root_basic_blocks), move(generator.m_string_table), move(generator.m_identifier_table), generator.m_next_register };
return adopt_own(*new Executable {
.name = {},
.basic_blocks = move(generator.m_root_basic_blocks),
.string_table = move(generator.m_string_table),
.identifier_table = move(generator.m_identifier_table),
.number_of_registers = generator.m_next_register });
}
void Generator::grow(size_t additional_size)

2
Userland/Libraries/LibJS/Bytecode/Generator.h
View File

@ -23,7 +23,7 @@ namespace JS::Bytecode {
class Generator {
public:
static Executable generate(ASTNode const&, FunctionKind = FunctionKind::Normal);
static NonnullOwnPtr<Executable> generate(ASTNode const&, FunctionKind = FunctionKind::Normal);
Register allocate_register();

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
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@ -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
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@ -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

12
Userland/Libraries/LibTest/JavaScriptTestRunner.h
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@ -343,11 +343,11 @@ inline JSFileResult TestRunner::run_file_test(const String& test_path)
if (g_run_bytecode) {
auto executable = JS::Bytecode::Generator::generate(test_script->parse_node());
executable.name = test_path;
executable->name = test_path;
if (JS::Bytecode::g_dump_bytecode)
executable.dump();
executable->dump();
JS::Bytecode::Interpreter bytecode_interpreter(interpreter->global_object(), interpreter->realm());
MUST(bytecode_interpreter.run(executable));
MUST(bytecode_interpreter.run(*executable));
} else {
g_vm->push_execution_context(global_execution_context, interpreter->global_object());
MUST(interpreter->run(*test_script));
@ -359,11 +359,11 @@ inline JSFileResult TestRunner::run_file_test(const String& test_path)
return { test_path, file_script.error() };
if (g_run_bytecode) {
auto executable = JS::Bytecode::Generator::generate(file_script.value()->parse_node());
executable.name = test_path;
executable->name = test_path;
if (JS::Bytecode::g_dump_bytecode)
executable.dump();
executable->dump();
JS::Bytecode::Interpreter bytecode_interpreter(interpreter->global_object(), interpreter->realm());
(void)bytecode_interpreter.run(executable);
(void)bytecode_interpreter.run(*executable);
} else {
g_vm->push_execution_context(global_execution_context, interpreter->global_object());
(void)interpreter->run(file_script.value());

8
Userland/Utilities/js.cpp
View File

@ -1028,19 +1028,19 @@ static bool parse_and_run(JS::Interpreter& interpreter, StringView source, Strin
if (JS::Bytecode::g_dump_bytecode || s_run_bytecode) {
auto executable = JS::Bytecode::Generator::generate(script_or_module->parse_node());
executable.name = source_name;
executable->name = source_name;
if (s_opt_bytecode) {
auto& passes = JS::Bytecode::Interpreter::optimization_pipeline();
passes.perform(executable);
passes.perform(*executable);
dbgln("Optimisation passes took {}us", passes.elapsed());
}
if (JS::Bytecode::g_dump_bytecode)
executable.dump();
executable->dump();
if (s_run_bytecode) {
JS::Bytecode::Interpreter bytecode_interpreter(interpreter.global_object(), interpreter.realm());
result = bytecode_interpreter.run(executable);
result = bytecode_interpreter.run(*executable);
} else {
return ReturnEarly::Yes;
}