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LibJS: Implement SuperCall for the Bytecode-VM

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Hendiadyoin1 2022-08-30 18:03:02 +02:00 • committed by Linus Groh
parent 25be67299e
commit 21ae882cfd
5 changed files with 130 additions and 2 deletions
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69
Userland/Libraries/LibJS/Bytecode/Op.cpp
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@ -15,6 +15,7 @@
#include <LibJS/Runtime/DeclarativeEnvironment.h>
#include <LibJS/Runtime/ECMAScriptFunctionObject.h>
#include <LibJS/Runtime/Environment.h>
#include <LibJS/Runtime/FunctionEnvironment.h>
#include <LibJS/Runtime/GlobalEnvironment.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/Iterator.h>
@ -525,6 +526,60 @@ ThrowCompletionOr<void> Call::execute_impl(Bytecode::Interpreter& interpreter) c
return {};
}
// 13.3.7.1 Runtime Semantics: Evaluation, https://tc39.es/ecma262/#sec-super-keyword-runtime-semantics-evaluation
ThrowCompletionOr<void> SuperCall::execute_impl(Bytecode::Interpreter& interpreter) const
{
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.
MarkedVector<Value> arg_list { vm.heap() };
if (m_is_synthetic) {
auto const& value = interpreter.accumulator();
VERIFY(value.is_object() && is<Array>(value.as_object()));
auto const& array_value = static_cast<Array const&>(value.as_object());
auto length = MUST(length_of_array_like(vm, array_value));
for (size_t i = 0; i < length; ++i)
arg_list.append(array_value.get_without_side_effects(PropertyKey { i }));
} else {
for (size_t i = 0; i < m_argument_count; ++i)
arg_list.append(interpreter.reg(m_arguments[i]));
}
// 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), move(arg_list), &new_target.as_function()));
// 7. Let thisER be GetThisEnvironment().
auto& this_environment = verify_cast<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(vm.initialize_instance_elements(*result, f));
// 12. Return result.
interpreter.accumulator() = result;
return {};
}
ThrowCompletionOr<void> NewFunction::execute_impl(Bytecode::Interpreter& interpreter) const
{
auto& vm = interpreter.vm();
@ -1000,6 +1055,20 @@ String Call::to_string_impl(Bytecode::Executable const&) const
return builder.to_string();
}
String SuperCall::to_string_impl(Bytecode::Executable const&) const
{
StringBuilder builder;
builder.append("SuperCall"sv);
if (m_is_synthetic) {
builder.append(" arguments:[...acc]"sv);
} else if (m_argument_count != 0) {
builder.append(" arguments:["sv);
builder.join(", "sv, Span<Register const>(m_arguments, m_argument_count));
builder.append(']');
}
return builder.to_string();
}
String NewFunction::to_string_impl(Bytecode::Executable const&) const
{
return "NewFunction";