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LibJS: Update AST to use completions :^)

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This is another major milestone on our journey towards removing global
VM exception state :^)
Does pretty much exactly what it says on the tin: updating
ASTNode::execute() to return a Completion instead of a plain value. This
will *also* allow us to eventually remove the non-standard unwinding
mechanism and purely rely on the various completion types.
This commit is contained in:
Linus Groh 2022-01-02 21:37:50 +01:00
parent 95acb1ce88
commit da856d7742
11 changed files with 507 additions and 692 deletions
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49
Userland/Libraries/LibJS/Runtime/VM.cpp
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@ -1,6 +1,6 @@
/*
* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2020-2021, Linus Groh <linusg@serenityos.org>
* Copyright (c) 2020-2022, Linus Groh <linusg@serenityos.org>
* Copyright (c) 2021, David Tuin <davidot@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
@ -160,10 +160,7 @@ ThrowCompletionOr<Value> VM::named_evaluation_if_anonymous_function(GlobalObject
}
}
auto value = expression.execute(interpreter(), global_object);
if (auto* thrown_exception = exception())
return JS::throw_completion(thrown_exception->value());
return value;
return TRY(expression.execute(interpreter(), global_object)).release_value();
}
// 13.15.5.2 Runtime Semantics: DestructuringAssignmentEvaluation, https://tc39.es/ecma262/#sec-runtime-semantics-destructuringassignmentevaluation
@ -244,9 +241,6 @@ ThrowCompletionOr<void> VM::property_binding_initialization(BindingPattern const
VERIFY_NOT_REACHED();
}
if (auto* thrown_exception = exception())
return JS::throw_completion(thrown_exception->value());
auto* rest_object = Object::create(global_object, global_object.object_prototype());
VERIFY(rest_object);
@ -257,25 +251,15 @@ ThrowCompletionOr<void> VM::property_binding_initialization(BindingPattern const
return assignment_target.initialize_referenced_binding(global_object, rest_object);
}
PropertyKey name;
property.name.visit(
[&](Empty) { VERIFY_NOT_REACHED(); },
[&](NonnullRefPtr<Identifier> const& identifier) {
name = identifier->string();
auto name = TRY(property.name.visit(
[&](Empty) -> ThrowCompletionOr<PropertyKey> { VERIFY_NOT_REACHED(); },
[&](NonnullRefPtr<Identifier> const& identifier) -> ThrowCompletionOr<PropertyKey> {
return identifier->string();
},
[&](NonnullRefPtr<Expression> const& expression) {
auto result = expression->execute(interpreter(), global_object);
if (exception())
return;
auto name_or_error = result.to_property_key(global_object);
if (name_or_error.is_error())
return;
name = name_or_error.release_value();
});
if (auto* thrown_exception = exception())
return JS::throw_completion(thrown_exception->value());
[&](NonnullRefPtr<Expression> const& expression) -> ThrowCompletionOr<PropertyKey> {
auto result = TRY(expression->execute(interpreter(), global_object)).release_value();
return result.to_property_key(global_object);
}));
seen_names.set(name);
@ -306,18 +290,12 @@ ThrowCompletionOr<void> VM::property_binding_initialization(BindingPattern const
return TRY(member_expression->to_reference(interpreter(), global_object));
}));
if (auto* thrown_exception = exception())
return JS::throw_completion(thrown_exception->value());
auto value_to_assign = TRY(object->get(name));
if (property.initializer && value_to_assign.is_undefined()) {
if (auto* identifier_ptr = property.alias.get_pointer<NonnullRefPtr<Identifier>>())
value_to_assign = TRY(named_evaluation_if_anonymous_function(global_object, *property.initializer, (*identifier_ptr)->string()));
else
value_to_assign = property.initializer->execute(interpreter(), global_object);
if (auto* thrown_exception = exception())
return JS::throw_completion(thrown_exception->value());
value_to_assign = TRY(property.initializer->execute(interpreter(), global_object)).release_value();
}
if (auto* binding_ptr = property.alias.get_pointer<NonnullRefPtr<BindingPattern>>()) {
@ -405,10 +383,7 @@ ThrowCompletionOr<void> VM::iterator_binding_initialization(BindingPattern const
if (auto* identifier_ptr = entry.alias.get_pointer<NonnullRefPtr<Identifier>>())
value = TRY(named_evaluation_if_anonymous_function(global_object, *entry.initializer, (*identifier_ptr)->string()));
else
value = entry.initializer->execute(interpreter(), global_object);
if (auto* thrown_exception = exception())
return JS::throw_completion(thrown_exception->value());
value = TRY(entry.initializer->execute(interpreter(), global_object)).release_value();
}
if (auto* binding_ptr = entry.alias.get_pointer<NonnullRefPtr<BindingPattern>>()) {