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LibJS: Allocate context up front in SuperCallWithArgumentArray
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Browse source 
This also removes the last user of Interpreter's argument buffer
allocation API, which we've used to repeatedly shoot ourselves in the
foot. Good-bye!
This commit is contained in:
Andreas Kling 2025-08-30 16:26:25 +02:00 • committed by Andreas Kling
commit f89afe8e27
Notes: github-actions[bot] 2025-08-31 13:25:35 +00:00
2 changed files with 73 additions and 83 deletions
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150
Libraries/LibJS/Bytecode/Interpreter.cpp
View file

@ -1562,29 +1562,6 @@ inline Value new_regexp(VM& vm, ParsedRegex const& parsed_regex, Utf16String pat
return regexp_object;
}
// 13.3.8.1 https://tc39.es/ecma262/#sec-runtime-semantics-argumentlistevaluation
inline Span<Value> argument_list_evaluation(Interpreter& interpreter, Value arguments)
{
// Note: Any spreading and actual evaluation is handled in preceding opcodes
// Note: The spec uses the concept of a list, while we create a temporary array
// in the preceding opcodes, so we have to convert in a manner that is not
// visible to the user
auto& argument_array = arguments.as_array();
auto array_length = argument_array.indexed_properties().array_like_size();
auto argument_values = interpreter.allocate_argument_values(array_length);
for (size_t i = 0; i < array_length; ++i) {
if (auto maybe_value = argument_array.indexed_properties().get(i); maybe_value.has_value())
argument_values[i] = maybe_value.release_value().value;
else
argument_values[i] = js_undefined();
}
return argument_values;
}
inline ThrowCompletionOr<void> create_variable(VM& vm, Utf16FlyString const& name, Op::EnvironmentMode mode, bool is_global, bool is_immutable, bool is_strict)
{
if (mode == Op::EnvironmentMode::Lexical) {
@ -1631,59 +1608,6 @@ inline ThrowCompletionOr<ECMAScriptFunctionObject*> new_class(VM& vm, Value supe
return TRY(class_expression.create_class_constructor(vm, class_environment, vm.lexical_environment(), super_class, element_keys, binding_name, class_name));
}
// 13.3.7.1 Runtime Semantics: Evaluation, https://tc39.es/ecma262/#sec-super-keyword-runtime-semantics-evaluation
inline ThrowCompletionOr<GC::Ref<Object>> super_call_with_argument_array(Interpreter& interpreter, Value argument_array, bool is_synthetic)
{
auto& vm = interpreter.vm();
// 1. Let newTarget be GetNewTarget().
auto new_target = vm.get_new_target();
// 2. Assert: Type(newTarget) is Object.
VERIFY(new_target.is_object());
// 3. Let func be GetSuperConstructor().
auto* func = get_super_constructor(vm);
// 4. Let argList be ? ArgumentListEvaluation of Arguments.
Span<Value> arg_list;
if (is_synthetic) {
VERIFY(argument_array.is_object() && is<Array>(argument_array.as_object()));
auto const& array_value = static_cast<Array const&>(argument_array.as_object());
auto length = MUST(length_of_array_like(vm, array_value));
arg_list = interpreter.allocate_argument_values(length);
for (size_t i = 0; i < length; ++i)
arg_list[i] = array_value.get_without_side_effects(PropertyKey { i });
} else {
arg_list = argument_list_evaluation(interpreter, argument_array);
}
// 5. If IsConstructor(func) is false, throw a TypeError exception.
if (!Value(func).is_constructor())
return vm.throw_completion<TypeError>(ErrorType::NotAConstructor, "Super constructor");
// 6. Let result be ? Construct(func, argList, newTarget).
auto result = TRY(construct(vm, static_cast<FunctionObject&>(*func), arg_list, &new_target.as_function()));
// 7. Let thisER be GetThisEnvironment().
auto& this_environment = as<FunctionEnvironment>(*get_this_environment(vm));
// 8. Perform ? thisER.BindThisValue(result).
TRY(this_environment.bind_this_value(vm, result));
// 9. Let F be thisER.[[FunctionObject]].
auto& f = this_environment.function_object();
// 10. Assert: F is an ECMAScript function object.
// NOTE: This is implied by the strong C++ type.
// 11. Perform ? InitializeInstanceElements(result, F).
TRY(result->initialize_instance_elements(f));
// 12. Return result.
return result;
}
inline ThrowCompletionOr<GC::Ref<Array>> iterator_to_array(VM& vm, Value iterator)
{
auto& iterator_record = static_cast<IteratorRecord&>(iterator.as_cell());
@ -2974,7 +2898,79 @@ ThrowCompletionOr<void> CallConstructWithArgumentArray::execute_impl(Bytecode::I
// 13.3.7.1 Runtime Semantics: Evaluation, https://tc39.es/ecma262/#sec-super-keyword-runtime-semantics-evaluation
ThrowCompletionOr<void> SuperCallWithArgumentArray::execute_impl(Bytecode::Interpreter& interpreter) const
{
interpreter.set(dst(), TRY(super_call_with_argument_array(interpreter, interpreter.get(arguments()), m_is_synthetic)));
auto& vm = interpreter.vm();
// 1. Let newTarget be GetNewTarget().
auto new_target = vm.get_new_target();
// 2. Assert: Type(newTarget) is Object.
VERIFY(new_target.is_object());
// 3. Let func be GetSuperConstructor().
auto* func = get_super_constructor(vm);
// NON-STANDARD: We're doing this step earlier to streamline control flow.
// 5. If IsConstructor(func) is false, throw a TypeError exception.
if (!Value(func).is_constructor())
return vm.throw_completion<TypeError>(ErrorType::NotAConstructor, "Super constructor");
auto& function = static_cast<FunctionObject&>(*func);
// 4. Let argList be ? ArgumentListEvaluation of Arguments.
auto& argument_array = interpreter.get(m_arguments).as_array();
size_t argument_array_length = 0;
if (m_is_synthetic) {
argument_array_length = MUST(length_of_array_like(vm, argument_array));
} else {
argument_array_length = argument_array.indexed_properties().array_like_size();
}
ExecutionContext* callee_context = nullptr;
size_t argument_count = argument_array_length;
size_t registers_and_constants_and_locals_count = 0;
TRY(function.get_stack_frame_size(registers_and_constants_and_locals_count, argument_count));
ALLOCATE_EXECUTION_CONTEXT_ON_NATIVE_STACK_WITHOUT_CLEARING_ARGS(callee_context, registers_and_constants_and_locals_count, max(argument_array_length, argument_count));
auto* callee_context_argument_values = callee_context->arguments.data();
auto const callee_context_argument_count = callee_context->arguments.size();
auto const insn_argument_count = argument_array_length;
if (m_is_synthetic) {
for (size_t i = 0; i < insn_argument_count; ++i)
callee_context_argument_values[i] = argument_array.get_without_side_effects(PropertyKey { i });
} else {
for (size_t i = 0; i < insn_argument_count; ++i) {
if (auto maybe_value = argument_array.indexed_properties().get(i); maybe_value.has_value())
callee_context_argument_values[i] = maybe_value.release_value().value;
else
callee_context_argument_values[i] = js_undefined();
}
}
for (size_t i = insn_argument_count; i < callee_context_argument_count; ++i)
callee_context_argument_values[i] = js_undefined();
callee_context->passed_argument_count = insn_argument_count;
// 6. Let result be ? Construct(func, argList, newTarget).
auto result = TRY(function.internal_construct(*callee_context, new_target.as_function()));
// 7. Let thisER be GetThisEnvironment().
auto& this_environment = as<FunctionEnvironment>(*get_this_environment(vm));
// 8. Perform ? thisER.BindThisValue(result).
TRY(this_environment.bind_this_value(vm, result));
// 9. Let F be thisER.[[FunctionObject]].
auto& f = this_environment.function_object();
// 10. Assert: F is an ECMAScript function object.
// NOTE: This is implied by the strong C++ type.
// 11. Perform ? InitializeInstanceElements(result, F).
TRY(result->initialize_instance_elements(f));
// 12. Return result.
interpreter.set(m_dst, result);
return {};
}

6
Libraries/LibJS/Bytecode/Interpreter.h
View file

@ -77,11 +77,6 @@ public:
Executable& current_executable() { return *m_current_executable; }
Executable const& current_executable() const { return *m_current_executable; }
Span<Value> allocate_argument_values(size_t argument_count)
{
m_argument_values_buffer.resize_and_keep_capacity(argument_count);
return m_argument_values_buffer.span();
}
ExecutionContext& running_execution_context() { return *m_running_execution_context; }
@ -101,7 +96,6 @@ private:
GC::Ptr<Object> m_global_object { nullptr };
GC::Ptr<DeclarativeEnvironment> m_global_declarative_environment { nullptr };
Span<Value> m_registers_and_constants_and_locals_arguments;
Vector<Value> m_argument_values_buffer;
ExecutionContext* m_running_execution_context { nullptr };
};