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LibJS: Move computation out of the ECMAScriptFunctionObject constructor

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We were doing way too much computation every time an ESFO was
instantiated. This was particularly sad, since the results of these
computations were identical every time!

This patch adds a new SharedFunctionInstanceData object that gets
shared between all instances of an ESFO instantiated from some kind of
AST FunctionNode.

~5% speedup on Speedometer 2.1 :^)
This commit is contained in:
Andreas Kling 2025-04-08 00:45:27 +02:00 • committed by Andreas Kling
parent 4209b18b88
commit 2a9b6f1d97
Notes: github-actions[bot] 2025-04-08 16:53:53 +00:00
7 changed files with 367 additions and 258 deletions
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31
Libraries/LibJS/AST.cpp
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@ -35,6 +35,7 @@
#include <LibJS/Runtime/RegExpObject.h>
#include <LibJS/Runtime/Shape.h>
#include <LibJS/Runtime/ValueInlines.h>
#include <memory>
#include <typeinfo>
namespace JS {
@ -363,7 +364,7 @@ ThrowCompletionOr<ECMAScriptFunctionObject*> ClassExpression::create_class_const
TRY(class_constructor->internal_set_prototype_of(constructor_parent));
if (!m_super_class.is_null())
class_constructor->set_constructor_kind(ECMAScriptFunctionObject::ConstructorKind::Derived);
class_constructor->set_constructor_kind(ConstructorKind::Derived);
prototype->define_direct_property(vm.names.constructor, class_constructor, Attribute::Writable | Attribute::Configurable);
@ -825,6 +826,34 @@ void BindingPattern::dump(int indent) const
}
}
FunctionNode::FunctionNode(RefPtr<Identifier const> name, ByteString source_text, NonnullRefPtr<Statement const> body, NonnullRefPtr<FunctionParameters const> parameters, i32 function_length, FunctionKind kind, bool is_strict_mode, FunctionParsingInsights parsing_insights, bool is_arrow_function, Vector<FlyString> local_variables_names)
: m_name(move(name))
, m_source_text(move(source_text))
, m_body(move(body))
, m_parameters(move(parameters))
, m_function_length(function_length)
, m_kind(kind)
, m_is_strict_mode(is_strict_mode)
, m_is_arrow_function(is_arrow_function)
, m_parsing_insights(parsing_insights)
, m_local_variables_names(move(local_variables_names))
{
if (m_is_arrow_function)
VERIFY(!parsing_insights.might_need_arguments_object);
}
FunctionNode::~FunctionNode() = default;
void FunctionNode::set_shared_data(RefPtr<SharedFunctionInstanceData> shared_data) const
{
m_shared_data = move(shared_data);
}
RefPtr<SharedFunctionInstanceData> FunctionNode::shared_data() const
{
return m_shared_data;
}
void FunctionNode::dump(int indent, ByteString const& class_name) const
{
print_indent(indent);