LibJS: Convert to_object() to ThrowCompletionOr

Meta/Lagom/Tools/CodeGenerators/LibWeb/WrapperGenerator.cpp

@@ -974,9 +974,10 @@ static void generate_to_cpp(SourceGenerator& generator, ParameterType& parameter
     } else if (is_wrappable_type(parameter.type)) {
         if (!parameter.type.nullable) {
             scoped_generator.append(R"~~~(
-    auto @cpp_name@_object = @js_name@@js_suffix@.to_object(global_object);
+    auto @cpp_name@_object_or_error = @js_name@@js_suffix@.to_object(global_object);
-    if (vm.exception())
+    if (@cpp_name@_object_or_error.is_error())
         @return_statement@
+    auto @cpp_name@_object = @cpp_name@_object_or_error.release_value();
 
     if (!is<@wrapper_name@>(@cpp_name@_object)) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAnObjectOfType, "@parameter.type.name@");
@@ -989,9 +990,10 @@ static void generate_to_cpp(SourceGenerator& generator, ParameterType& parameter
             scoped_generator.append(R"~~~(
     @parameter.type.name@* @cpp_name@ = nullptr;
     if (!@js_name@@js_suffix@.is_nullish()) {
-        auto @cpp_name@_object = @js_name@@js_suffix@.to_object(global_object);
+        auto @cpp_name@_object_or_error = @js_name@@js_suffix@.to_object(global_object);
-        if (vm.exception())
+        if (@cpp_name@_object_or_error.is_error())
             @return_statement@
+        auto @cpp_name@_object = @cpp_name@_object_or_error.release_value();
 
         if (!is<@wrapper_name@>(@cpp_name@_object)) {
             vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAnObjectOfType, "@parameter.type.name@");
@@ -3030,9 +3032,7 @@ void @prototype_class@::initialize(JS::GlobalObject& global_object)
         generator.append(R"~~~(
 static @fully_qualified_name@* impl_from(JS::VM& vm, JS::GlobalObject& global_object)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
 )~~~");
 
         if (interface.name == "EventTarget") {
@@ -3528,9 +3528,7 @@ void @prototype_class@::initialize(JS::GlobalObject& global_object)
 
 static @fully_qualified_name@* impl_from(JS::VM& vm, JS::GlobalObject& global_object)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
     if (!is<@wrapper_class@>(this_object)) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAnObjectOfType, "@fully_qualified_name@");
         return nullptr;

Tests/LibJS/test-js.cpp

@@ -32,9 +32,7 @@ TESTJS_GLOBAL_FUNCTION(run_queued_promise_jobs, runQueuedPromiseJobs)
 
 TESTJS_GLOBAL_FUNCTION(get_weak_set_size, getWeakSetSize)
 {
-    auto* object = vm.argument(0).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.argument(0).to_object(global_object));
-    if (!object)
-        return {};
     if (!is<JS::WeakSet>(object)) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAnObjectOfType, "WeakSet");
         return {};
@@ -45,9 +43,7 @@ TESTJS_GLOBAL_FUNCTION(get_weak_set_size, getWeakSetSize)
 
 TESTJS_GLOBAL_FUNCTION(get_weak_map_size, getWeakMapSize)
 {
-    auto* object = vm.argument(0).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.argument(0).to_object(global_object));
-    if (!object)
-        return {};
     if (!is<JS::WeakMap>(object)) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAnObjectOfType, "WeakMap");
         return {};

Tests/LibWasm/test-wasm.cpp

@@ -93,9 +93,7 @@ HashMap<Wasm::Linker::Name, Wasm::ExternValue> WebAssemblyModule::s_spec_test_na
 
 TESTJS_GLOBAL_FUNCTION(parse_webassembly_module, parseWebAssemblyModule)
 {
-    auto object = vm.argument(0).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.argument(0).to_object(global_object));
-    if (vm.exception())
-        return {};
     if (!is<JS::Uint8Array>(object)) {
         vm.throw_exception<JS::TypeError>(global_object, "Expected a Uint8Array argument to parse_webassembly_module");
         return {};
@@ -139,17 +137,13 @@ TESTJS_GLOBAL_FUNCTION(parse_webassembly_module, parseWebAssemblyModule)
 
 TESTJS_GLOBAL_FUNCTION(compare_typed_arrays, compareTypedArrays)
 {
-    auto lhs = vm.argument(0).to_object(global_object);
+    auto* lhs = TRY_OR_DISCARD(vm.argument(0).to_object(global_object));
-    if (vm.exception())
-        return {};
     if (!is<JS::TypedArrayBase>(lhs)) {
         vm.throw_exception<JS::TypeError>(global_object, "Expected a TypedArray");
         return {};
     }
     auto& lhs_array = static_cast<JS::TypedArrayBase&>(*lhs);
-    auto rhs = vm.argument(1).to_object(global_object);
+    auto* rhs = TRY_OR_DISCARD(vm.argument(1).to_object(global_object));
-    if (vm.exception())
-        return {};
     if (!is<JS::TypedArrayBase>(rhs)) {
         vm.throw_exception<JS::TypeError>(global_object, "Expected a TypedArray");
         return {};
@@ -169,10 +163,8 @@ JS_DEFINE_NATIVE_FUNCTION(WebAssemblyModule::get_export)
 {
     auto name = TRY_OR_DISCARD(vm.argument(0).to_string(global_object));
     auto this_value = vm.this_value(global_object);
-    auto object = this_value.to_object(global_object);
+    auto* object = TRY_OR_DISCARD(this_value.to_object(global_object));
-    if (vm.exception())
+    if (!is<WebAssemblyModule>(object)) {
-        return {};
-    if (!object || !is<WebAssemblyModule>(object)) {
         vm.throw_exception<JS::TypeError>(global_object, "Not a WebAssemblyModule");
         return {};
     }

Userland/Applications/Spreadsheet/JSIntegration.cpp

@@ -171,9 +171,7 @@ void SheetGlobalObject::visit_edges(Visitor& visitor)
 
 JS_DEFINE_NATIVE_FUNCTION(SheetGlobalObject::get_real_cell_contents)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return JS::js_null();
 
     if (!is<SheetGlobalObject>(this_object)) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAnObjectOfType, "SheetGlobalObject");
@@ -210,9 +208,7 @@ JS_DEFINE_NATIVE_FUNCTION(SheetGlobalObject::get_real_cell_contents)
 
 JS_DEFINE_NATIVE_FUNCTION(SheetGlobalObject::set_real_cell_contents)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return JS::js_null();
 
     if (!is<SheetGlobalObject>(this_object)) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAnObjectOfType, "SheetGlobalObject");
@@ -251,9 +247,7 @@ JS_DEFINE_NATIVE_FUNCTION(SheetGlobalObject::set_real_cell_contents)
 
 JS_DEFINE_NATIVE_FUNCTION(SheetGlobalObject::parse_cell_name)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return JS::js_null();
 
     if (!is<SheetGlobalObject>(this_object)) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAnObjectOfType, "SheetGlobalObject");
@@ -289,9 +283,7 @@ JS_DEFINE_NATIVE_FUNCTION(SheetGlobalObject::current_cell_position)
         return {};
     }
 
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return JS::js_null();
 
     if (!is<SheetGlobalObject>(this_object)) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAnObjectOfType, "SheetGlobalObject");
@@ -327,9 +319,7 @@ JS_DEFINE_NATIVE_FUNCTION(SheetGlobalObject::column_index)
 
     auto& column_name_str = column_name.as_string().string();
 
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return JS::js_null();
 
     if (!is<SheetGlobalObject>(this_object)) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAnObjectOfType, "SheetGlobalObject");
@@ -368,9 +358,7 @@ JS_DEFINE_NATIVE_FUNCTION(SheetGlobalObject::column_arithmetic)
 
     auto offset_number = offset.as_i32();
 
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return JS::js_null();
 
     if (!is<SheetGlobalObject>(this_object)) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAnObjectOfType, "SheetGlobalObject");
@@ -423,9 +411,7 @@ JS_DEFINE_NATIVE_FUNCTION(WorkbookObject::sheet)
         return {};
     }
 
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
 
     if (!is<WorkbookObject>(this_object)) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAnObjectOfType, "WorkbookObject");

Userland/Libraries/LibJS/AST.cpp

@@ -438,9 +438,7 @@ Value WithStatement::execute(Interpreter& interpreter, GlobalObject& global_obje
         return {};
 
     // 2. Let obj be ? ToObject(? GetValue(value)).
-    auto* object = value.to_object(global_object);
+    auto* object = TRY_OR_DISCARD(value.to_object(global_object));
-    if (interpreter.exception())
-        return {};
 
     // 3. Let oldEnv be the running execution context's LexicalEnvironment.
     auto* old_environment = interpreter.vm().running_execution_context().lexical_environment;
@@ -819,8 +817,7 @@ Value ForInStatement::execute(Interpreter& interpreter, GlobalObject& global_obj
     if (rhs_result.is_nullish())
         return js_undefined();
 
-    auto* object = rhs_result.to_object(global_object);
+    auto* object = MUST(rhs_result.to_object(global_object));
-    VERIFY(object);
 
     // 14.7.5.7 ForIn/OfBodyEvaluation ( lhs, stmt, iteratorRecord, iterationKind, lhsKind, labelSet [ , iteratorKind ] ), https://tc39.es/ecma262/#sec-runtime-semantics-forin-div-ofbodyevaluation-lhs-stmt-iterator-lhskind-labelset
     Environment* old_environment = interpreter.lexical_environment();

Userland/Libraries/LibJS/Bytecode/Op.cpp

@@ -129,9 +129,10 @@ void IteratorToArray::execute_impl(Bytecode::Interpreter& interpreter) const
 {
     auto& global_object = interpreter.global_object();
     auto& vm = interpreter.vm();
-    auto iterator = interpreter.accumulator().to_object(global_object);
+    auto iterator_or_error = interpreter.accumulator().to_object(global_object);
-    if (vm.exception())
+    if (iterator_or_error.is_error())
         return;
+    auto* iterator = iterator_or_error.release_value();
 
     auto array = Array::create(global_object, 0);
     size_t index = 0;
@@ -179,9 +180,10 @@ void NewRegExp::execute_impl(Bytecode::Interpreter& interpreter) const
 
 void CopyObjectExcludingProperties::execute_impl(Bytecode::Interpreter& interpreter) const
 {
-    auto* from_object = interpreter.reg(m_from_object).to_object(interpreter.global_object());
+    auto from_object_or_error = interpreter.reg(m_from_object).to_object(interpreter.global_object());
-    if (interpreter.vm().exception())
+    if (from_object_or_error.is_error())
         return;
+    auto* from_object = from_object_or_error.release_value();
 
     auto* to_object = Object::create(interpreter.global_object(), interpreter.global_object().object_prototype());
 
@@ -238,18 +240,23 @@ void SetVariable::execute_impl(Bytecode::Interpreter& interpreter) const
 
 void GetById::execute_impl(Bytecode::Interpreter& interpreter) const
 {
-    if (auto* object = interpreter.accumulator().to_object(interpreter.global_object())) {
+    auto object_or_error = interpreter.accumulator().to_object(interpreter.global_object());
-        auto value_or_error = object->get(interpreter.current_executable().get_string(m_property));
+    if (object_or_error.is_error())
-        if (value_or_error.is_error())
+        return;
-            return;
+    auto* object = object_or_error.release_value();
-        interpreter.accumulator() = value_or_error.release_value();
+    auto value_or_error = object->get(interpreter.current_executable().get_string(m_property));
-    }
+    if (value_or_error.is_error())
+        return;
+    interpreter.accumulator() = value_or_error.release_value();
 }
 
 void PutById::execute_impl(Bytecode::Interpreter& interpreter) const
 {
-    if (auto* object = interpreter.reg(m_base).to_object(interpreter.global_object()))
+    auto object_or_error = interpreter.reg(m_base).to_object(interpreter.global_object());
-        MUST(object->set(interpreter.current_executable().get_string(m_property), interpreter.accumulator(), Object::ShouldThrowExceptions::Yes));
+    if (object_or_error.is_error())
+        return;
+    auto* object = object_or_error.release_value();
+    MUST(object->set(interpreter.current_executable().get_string(m_property), interpreter.accumulator(), Object::ShouldThrowExceptions::Yes));
 }
 
 void Jump::execute_impl(Bytecode::Interpreter& interpreter) const
@@ -430,25 +437,29 @@ void Yield::replace_references_impl(BasicBlock const& from, BasicBlock const& to
 
 void GetByValue::execute_impl(Bytecode::Interpreter& interpreter) const
 {
-    if (auto* object = interpreter.reg(m_base).to_object(interpreter.global_object())) {
+    auto object_or_error = interpreter.reg(m_base).to_object(interpreter.global_object());
-        auto property_key = interpreter.accumulator().to_property_key(interpreter.global_object());
+    if (object_or_error.is_error())
-        if (interpreter.vm().exception())
+        return;
-            return;
+    auto* object = object_or_error.release_value();
-        auto value_or_error = object->get(property_key);
+    auto property_key = interpreter.accumulator().to_property_key(interpreter.global_object());
-        if (value_or_error.is_error())
+    if (interpreter.vm().exception())
-            return;
+        return;
-        interpreter.accumulator() = value_or_error.release_value();
+    auto value_or_error = object->get(property_key);
-    }
+    if (value_or_error.is_error())
+        return;
+    interpreter.accumulator() = value_or_error.release_value();
 }
 
 void PutByValue::execute_impl(Bytecode::Interpreter& interpreter) const
 {
-    if (auto* object = interpreter.reg(m_base).to_object(interpreter.global_object())) {
+    auto object_or_error = interpreter.reg(m_base).to_object(interpreter.global_object());
-        auto property_key = interpreter.reg(m_property).to_property_key(interpreter.global_object());
+    if (object_or_error.is_error())
-        if (interpreter.vm().exception())
+        return;
-            return;
+    auto* object = object_or_error.release_value();
-        MUST(object->set(property_key, interpreter.accumulator(), Object::ShouldThrowExceptions::Yes));
+    auto property_key = interpreter.reg(m_property).to_property_key(interpreter.global_object());
-    }
+    if (interpreter.vm().exception())
+        return;
+    MUST(object->set(property_key, interpreter.accumulator(), Object::ShouldThrowExceptions::Yes));
 }
 
 void GetIterator::execute_impl(Bytecode::Interpreter& interpreter) const
@@ -458,20 +469,29 @@ void GetIterator::execute_impl(Bytecode::Interpreter& interpreter) const
 
 void IteratorNext::execute_impl(Bytecode::Interpreter& interpreter) const
 {
-    if (auto* object = interpreter.accumulator().to_object(interpreter.global_object()))
+    auto object_or_error = interpreter.accumulator().to_object(interpreter.global_object());
-        interpreter.accumulator() = iterator_next(*object);
+    if (object_or_error.is_error())
+        return;
+    auto* object = object_or_error.release_value();
+    interpreter.accumulator() = iterator_next(*object);
 }
 
 void IteratorResultDone::execute_impl(Bytecode::Interpreter& interpreter) const
 {
-    if (auto* iterator_result = interpreter.accumulator().to_object(interpreter.global_object()))
+    auto iterator_result_or_error = interpreter.accumulator().to_object(interpreter.global_object());
-        interpreter.accumulator() = Value(iterator_complete(interpreter.global_object(), *iterator_result));
+    if (iterator_result_or_error.is_error())
+        return;
+    auto* iterator_result = iterator_result_or_error.release_value();
+    interpreter.accumulator() = Value(iterator_complete(interpreter.global_object(), *iterator_result));
 }
 
 void IteratorResultValue::execute_impl(Bytecode::Interpreter& interpreter) const
 {
-    if (auto* iterator_result = interpreter.accumulator().to_object(interpreter.global_object()))
+    auto iterator_result_or_error = interpreter.accumulator().to_object(interpreter.global_object());
-        interpreter.accumulator() = iterator_value(interpreter.global_object(), *iterator_result);
+    if (iterator_result_or_error.is_error())
+        return;
+    auto* iterator_result = iterator_result_or_error.release_value();
+    interpreter.accumulator() = iterator_value(interpreter.global_object(), *iterator_result);
 }
 
 void NewClass::execute_impl(Bytecode::Interpreter&) const

Userland/Libraries/LibJS/Runtime/ArrayConstructor.cpp

@@ -165,7 +165,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayConstructor::from)
         }
     }
 
-    auto* array_like = items.to_object(global_object);
+    auto* array_like = MUST(items.to_object(global_object));
 
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *array_like));
 

Userland/Libraries/LibJS/Runtime/ArrayPrototype.cpp

@@ -160,9 +160,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::filter)
     auto this_arg = vm.argument(1);
 
     // 1. Let O be ? ToObject(this value).
-    auto* object = vm.this_value(global_object).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     // 2. Let len be ? LengthOfArrayLike(O).
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *object));
@@ -224,9 +222,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::for_each)
     auto this_arg = vm.argument(1);
 
     // 1. Let O be ? ToObject(this value).
-    auto object = vm.this_value(global_object).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     // 2. Let len be ? LengthOfArrayLike(O).
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *object));
@@ -271,9 +267,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::map)
     auto this_arg = vm.argument(1);
 
     // 1. Let O be ? ToObject(this value).
-    auto* object = vm.this_value(global_object).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     // 2. Let len be ? LengthOfArrayLike(O).
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *object));
@@ -320,9 +314,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::map)
 // 23.1.3.20 Array.prototype.push ( ...items ), https://tc39.es/ecma262/#sec-array.prototype.push
 JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::push)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *this_object));
     auto argument_count = vm.argument_count();
     auto new_length = length + argument_count;
@@ -340,9 +332,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::push)
 // 23.1.3.31 Array.prototype.unshift ( ...items ), https://tc39.es/ecma262/#sec-array.prototype.unshift
 JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::unshift)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *this_object));
     auto arg_count = vm.argument_count();
     size_t new_length = length + arg_count;
@@ -376,9 +366,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::unshift)
 // 23.1.3.19 Array.prototype.pop ( ), https://tc39.es/ecma262/#sec-array.prototype.pop
 JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::pop)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *this_object));
     if (length == 0) {
         TRY_OR_DISCARD(this_object->set(vm.names.length, Value(0), Object::ShouldThrowExceptions::Yes));
@@ -394,9 +382,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::pop)
 // 23.1.3.24 Array.prototype.shift ( ), https://tc39.es/ecma262/#sec-array.prototype.shift
 JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::shift)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *this_object));
     if (length == 0) {
         TRY_OR_DISCARD(this_object->set(vm.names.length, Value(0), Object::ShouldThrowExceptions::Yes));
@@ -423,9 +409,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::shift)
 // 23.1.3.30 Array.prototype.toString ( ), https://tc39.es/ecma262/#sec-array.prototype.tostring
 JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::to_string)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
     auto join_function = TRY_OR_DISCARD(this_object->get(vm.names.join));
     if (!join_function.is_function())
         return ObjectPrototype::to_string(vm, global_object);
@@ -435,9 +419,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::to_string)
 // 23.1.3.29 Array.prototype.toLocaleString ( [ reserved1 [ , reserved2 ] ] ), https://tc39.es/ecma262/#sec-array.prototype.tolocalestring
 JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::to_locale_string)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
 
     if (s_array_join_seen_objects.contains(this_object))
         return js_string(vm, "");
@@ -466,9 +448,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::to_locale_string)
 // 23.1.3.15 Array.prototype.join ( separator ), https://tc39.es/ecma262/#sec-array.prototype.join
 JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::join)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
 
     // This is not part of the spec, but all major engines do some kind of circular reference checks.
     // FWIW: engine262, a "100% spec compliant" ECMA-262 impl, aborts with "too much recursion".
@@ -501,9 +481,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::join)
 // 23.1.3.1 Array.prototype.concat ( ...items ), https://tc39.es/ecma262/#sec-array.prototype.concat
 JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::concat)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
 
     auto* new_array = array_species_create(global_object, *this_object, 0);
     if (vm.exception())
@@ -513,14 +491,10 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::concat)
 
     // 23.1.3.1.1 IsConcatSpreadable ( O ), https://tc39.es/ecma262/#sec-isconcatspreadable
     auto is_concat_spreadable = [&vm, &global_object](Value const& val) -> bool {
-        if (!val.is_object()) {
+        if (!val.is_object())
             return false;
-        }
+        auto& object = val.as_object();
-        auto* object = val.to_object(global_object);
+        auto spreadable = TRY_OR_DISCARD(object.get(*vm.well_known_symbol_is_concat_spreadable()));
-        if (vm.exception())
-            return false;
-
-        auto spreadable = TRY_OR_DISCARD(object->get(*vm.well_known_symbol_is_concat_spreadable()));
         if (!spreadable.is_undefined())
             return spreadable.to_boolean();
 
@@ -591,9 +565,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::concat)
 // 23.1.3.25 Array.prototype.slice ( start, end ), https://tc39.es/ecma262/#sec-array.prototype.slice
 JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::slice)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
 
     auto initial_length = TRY_OR_DISCARD(length_of_array_like(global_object, *this_object));
 
@@ -660,9 +632,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::index_of)
     auto from_index = vm.argument(1);
 
     // 1. Let O be ? ToObject(this value).
-    auto* object = vm.this_value(global_object).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     // 2. Let len be ? LengthOfArrayLike(O).
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *object));
@@ -736,9 +706,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::reduce)
     auto initial_value = vm.argument(1);
 
     // 1. Let O be ? ToObject(this value).
-    auto* object = vm.this_value(global_object).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     // 2. Let len be ? LengthOfArrayLike(O).
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *object));
@@ -826,9 +794,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::reduce_right)
     auto initial_value = vm.argument(1);
 
     // 1. Let O be ? ToObject(this value).
-    auto* object = vm.this_value(global_object).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     // 2. Let len be ? LengthOfArrayLike(O).
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *object));
@@ -912,9 +878,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::reduce_right)
 // 23.1.3.23 Array.prototype.reverse ( ), https://tc39.es/ecma262/#sec-array.prototype.reverse
 JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::reverse)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *this_object));
 
     auto middle = length / 2;
@@ -1067,9 +1031,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::sort)
         return {};
     }
 
-    auto* object = vm.this_value(global_object).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *object));
 
@@ -1111,9 +1073,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::last_index_of)
     auto from_index = vm.argument(1);
 
     // 1. Let O be ? ToObject(this value).
-    auto* object = vm.this_value(global_object).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     // 2. Let len be ? LengthOfArrayLike(O).
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *object));
@@ -1180,9 +1140,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::last_index_of)
 // 23.1.3.13 Array.prototype.includes ( searchElement [ , fromIndex ] ), https://tc39.es/ecma262/#sec-array.prototype.includes
 JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::includes)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *this_object));
     if (length == 0)
         return Value(false);
@@ -1218,9 +1176,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::find)
     auto this_arg = vm.argument(1);
 
     // 1. Let O be ? ToObject(this value).
-    auto* object = vm.this_value(global_object).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     // 2. Let len be ? LengthOfArrayLike(O).
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *object));
@@ -1261,9 +1217,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::find_index)
     auto this_arg = vm.argument(1);
 
     // 1. Let O be ? ToObject(this value).
-    auto* object = vm.this_value(global_object).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     // 2. Let len be ? LengthOfArrayLike(O).
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *object));
@@ -1304,9 +1258,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::find_last)
     auto this_arg = vm.argument(1);
 
     // 1. Let O be ? ToObject(this value).
-    auto* object = vm.this_value(global_object).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     // 2. Let len be ? LengthOfArrayLike(O).
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *object));
@@ -1347,9 +1299,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::find_last_index)
     auto this_arg = vm.argument(1);
 
     // 1. Let O be ? ToObject(this value).
-    auto* object = vm.this_value(global_object).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     // 2. Let len be ? LengthOfArrayLike(O).
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *object));
@@ -1390,9 +1340,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::some)
     auto this_arg = vm.argument(1);
 
     // 1. Let O be ? ToObject(this value).
-    auto* object = vm.this_value(global_object).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     // 2. Let len be ? LengthOfArrayLike(O).
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *object));
@@ -1439,9 +1387,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::every)
     auto this_arg = vm.argument(1);
 
     // 1. Let O be ? ToObject(this value).
-    auto object = vm.this_value(global_object).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     // 2. Let len be ? LengthOfArrayLike(O).
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *object));
@@ -1484,9 +1430,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::every)
 // 23.1.3.28 Array.prototype.splice ( start, deleteCount, ...items ), https://tc39.es/ecma262#sec-array.prototype.splice
 JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::splice)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
 
     auto initial_length = TRY_OR_DISCARD(length_of_array_like(global_object, *this_object));
 
@@ -1586,9 +1530,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::splice)
 // 23.1.3.6 Array.prototype.fill ( value [ , start [ , end ] ] ), https://tc39.es/ecma262/#sec-array.prototype.fill
 JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::fill)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
 
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *this_object));
 
@@ -1633,9 +1575,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::fill)
 // 23.1.3.32 Array.prototype.values ( ), https://tc39.es/ecma262/#sec-array.prototype.values
 JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::values)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
 
     return ArrayIterator::create(global_object, this_object, Object::PropertyKind::Value);
 }
@@ -1643,9 +1583,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::values)
 // 23.1.3.16 Array.prototype.entries ( ), https://tc39.es/ecma262/#sec-array.prototype.entries
 JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::entries)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
 
     return ArrayIterator::create(global_object, this_object, Object::PropertyKind::KeyAndValue);
 }
@@ -1653,9 +1591,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::entries)
 // 23.1.3.16 Array.prototype.keys ( ), https://tc39.es/ecma262/#sec-array.prototype.keys
 JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::keys)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
 
     return ArrayIterator::create(global_object, this_object, Object::PropertyKind::Key);
 }
@@ -1704,9 +1640,7 @@ static size_t flatten_into_array(GlobalObject& global_object, Object& new_array,
 // 23.1.3.10 Array.prototype.flat ( [ depth ] ), https://tc39.es/ecma262/#sec-array.prototype.flat
 JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::flat)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
 
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *this_object));
 
@@ -1735,9 +1669,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::flat_map)
     auto this_arg = vm.argument(1);
 
     // 1. Let O be ? ToObject(this value).
-    auto* object = vm.this_value(global_object).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     // 2. Let sourceLen be ? LengthOfArrayLike(O).
     auto source_length = TRY_OR_DISCARD(length_of_array_like(global_object, *object));
@@ -1765,9 +1697,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::flat_map)
 // 23.1.3.3 Array.prototype.copyWithin ( target, start [ , end ] ), https://tc39.es/ecma262/#sec-array.prototype.copywithin
 JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::copy_within)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *this_object));
 
     auto relative_target = vm.argument(0).to_integer_or_infinity(global_object);
@@ -1839,9 +1769,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::copy_within)
 // 1.1 Array.prototype.at ( index ), https://tc39.es/proposal-relative-indexing-method/#sec-array.prototype.at
 JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::at)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *this_object));
     auto relative_index = vm.argument(0).to_integer_or_infinity(global_object);
     if (vm.exception())

Userland/Libraries/LibJS/Runtime/ECMAScriptFunctionObject.cpp

@@ -644,7 +644,7 @@ void ECMAScriptFunctionObject::ordinary_call_bind_this(ExecutionContext& callee_
         // b. Else,
         else {
             // i. Let thisValue be ! ToObject(thisArgument).
-            this_value = this_argument.to_object(global_object());
+            this_value = MUST(this_argument.to_object(global_object()));
 
             // ii. NOTE: ToObject produces wrapper objects using calleeRealm.
             // FIXME: It currently doesn't, as we pass the function's global object.

Userland/Libraries/LibJS/Runtime/FunctionObject.cpp

@@ -25,7 +25,7 @@ BoundFunction* FunctionObject::bind(Value bound_this_value, Vector<Value> argume
     auto& vm = this->vm();
     FunctionObject& target_function = is<BoundFunction>(*this) ? static_cast<BoundFunction&>(*this).bound_target_function() : *this;
 
-    auto bound_this_object = [&vm, bound_this_value, this]() -> Value {
+    auto get_bound_this_object = [&vm, bound_this_value, this]() -> ThrowCompletionOr<Value> {
         if (is<BoundFunction>(*this) && !static_cast<BoundFunction&>(*this).bound_this().is_empty())
             return static_cast<BoundFunction&>(*this).bound_this();
         switch (bound_this_value.type()) {
@@ -33,11 +33,12 @@ BoundFunction* FunctionObject::bind(Value bound_this_value, Vector<Value> argume
         case Value::Type::Null:
             if (vm.in_strict_mode())
                 return bound_this_value;
-            return &global_object();
+            return { &global_object() };
         default:
-            return bound_this_value.to_object(global_object());
+            return { TRY(bound_this_value.to_object(global_object())) };
         }
-    }();
+    };
+    auto bound_this_object = TRY_OR_DISCARD(get_bound_this_object());
 
     i32 computed_length = 0;
     auto length_property = TRY_OR_DISCARD(get(vm.names.length));

Userland/Libraries/LibJS/Runtime/FunctionPrototype.cpp

@@ -45,9 +45,7 @@ FunctionPrototype::~FunctionPrototype()
 // 20.2.3.1 Function.prototype.apply ( thisArg, argArray ), https://tc39.es/ecma262/#sec-function.prototype.apply
 JS_DEFINE_NATIVE_FUNCTION(FunctionPrototype::apply)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
     if (!this_object->is_function()) {
         vm.throw_exception<TypeError>(global_object, ErrorType::NotAnObjectOfType, "Function");
         return {};
@@ -64,9 +62,7 @@ JS_DEFINE_NATIVE_FUNCTION(FunctionPrototype::apply)
 // 20.2.3.2 Function.prototype.bind ( thisArg, ...args ), https://tc39.es/ecma262/#sec-function.prototype.bind
 JS_DEFINE_NATIVE_FUNCTION(FunctionPrototype::bind)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
     if (!this_object->is_function()) {
         vm.throw_exception<TypeError>(global_object, ErrorType::NotAnObjectOfType, "Function");
         return {};
@@ -86,9 +82,7 @@ JS_DEFINE_NATIVE_FUNCTION(FunctionPrototype::bind)
 // 20.2.3.3 Function.prototype.call ( thisArg, ...args ), https://tc39.es/ecma262/#sec-function.prototype.call
 JS_DEFINE_NATIVE_FUNCTION(FunctionPrototype::call)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
     if (!this_object->is_function()) {
         vm.throw_exception<TypeError>(global_object, ErrorType::NotAnObjectOfType, "Function");
         return {};
@@ -106,9 +100,7 @@ JS_DEFINE_NATIVE_FUNCTION(FunctionPrototype::call)
 // 20.2.3.5 Function.prototype.toString ( ), https://tc39.es/ecma262/#sec-function.prototype.tostring
 JS_DEFINE_NATIVE_FUNCTION(FunctionPrototype::to_string)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
     if (!this_object->is_function()) {
         vm.throw_exception<TypeError>(global_object, ErrorType::NotAnObjectOfType, "Function");
         return {};

Userland/Libraries/LibJS/Runtime/GeneratorObject.cpp

@@ -17,10 +17,7 @@ GeneratorObject* GeneratorObject::create(GlobalObject& global_object, Value init
 {
     // This is "g1.prototype" in figure-2 (https://tc39.es/ecma262/img/figure-2.png)
     auto generating_function_prototype = TRY_OR_DISCARD(generating_function->get(global_object.vm().names.prototype));
-    auto* generating_function_prototype_object = generating_function_prototype.to_object(global_object);
+    auto* generating_function_prototype_object = TRY_OR_DISCARD(generating_function_prototype.to_object(global_object));
-    if (!generating_function_prototype_object)
-        return {};
-
     auto object = global_object.heap().allocate<GeneratorObject>(global_object, global_object, *generating_function_prototype_object);
     object->m_generating_function = generating_function;
     object->m_environment = generating_scope;

Userland/Libraries/LibJS/Runtime/Intl/AbstractOperations.cpp

@@ -208,9 +208,7 @@ ThrowCompletionOr<Vector<String>> canonicalize_locale_list(GlobalObject& global_
     // 4. Else,
     else {
         // a. Let O be ? ToObject(locales).
-        object = locales.to_object(global_object);
+        object = TRY(locales.to_object(global_object));
-        if (auto* exception = vm.exception())
-            return throw_completion(exception->value());
     }
 
     // 5. Let len be ? ToLength(? Get(O, "length")).
@@ -589,8 +587,6 @@ ThrowCompletionOr<Array*> supported_locales(GlobalObject& global_object, Vector<
 // 9.2.12 CoerceOptionsToObject ( options ), https://tc39.es/ecma402/#sec-coerceoptionstoobject
 ThrowCompletionOr<Object*> coerce_options_to_object(GlobalObject& global_object, Value options)
 {
-    auto& vm = global_object.vm();
-
     // 1. If options is undefined, then
     if (options.is_undefined()) {
         // a. Return ! OrdinaryObjectCreate(null).
@@ -598,10 +594,7 @@ ThrowCompletionOr<Object*> coerce_options_to_object(GlobalObject& global_object,
     }
 
     // 2. Return ? ToObject(options).
-    auto result = options.to_object(global_object);
+    return TRY(options.to_object(global_object));
-    if (auto* exception = vm.exception())
-        return throw_completion(exception->value());
-    return result;
 }
 
 // 9.2.13 GetOption ( options, property, type, values, fallback ), https://tc39.es/ecma402/#sec-getoption

Userland/Libraries/LibJS/Runtime/IteratorOperations.cpp

@@ -18,9 +18,7 @@ Object* get_iterator(GlobalObject& global_object, Value value, IteratorHint hint
     if (method.is_empty()) {
         if (hint == IteratorHint::Async)
             TODO();
-        auto object = value.to_object(global_object);
+        auto object = TRY_OR_DISCARD(value.to_object(global_object));
-        if (!object)
-            return {};
         method = TRY_OR_DISCARD(object->get(*vm.well_known_symbol_iterator()));
     }
     if (!method.is_function()) {

Userland/Libraries/LibJS/Runtime/IteratorPrototype.cpp

@@ -30,9 +30,7 @@ IteratorPrototype::~IteratorPrototype()
 // 27.1.2.1 %IteratorPrototype% [ @@iterator ] ( ), https://tc39.es/ecma262/#sec-%iteratorprototype%-@@iterator
 JS_DEFINE_NATIVE_FUNCTION(IteratorPrototype::symbol_iterator)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
     return this_object;
 }
 

Userland/Libraries/LibJS/Runtime/JSONObject.cpp

@@ -137,9 +137,7 @@ String JSONObject::serialize_json_property(GlobalObject& global_object, Stringif
     auto& vm = global_object.vm();
     auto value = TRY_OR_DISCARD(holder->get(key));
     if (value.is_object() || value.is_bigint()) {
-        auto* value_object = value.to_object(global_object);
+        auto* value_object = TRY_OR_DISCARD(value.to_object(global_object));
-        if (vm.exception())
-            return {};
         auto to_json = TRY_OR_DISCARD(value_object->get(vm.names.toJSON));
         if (to_json.is_function())
             value = TRY_OR_DISCARD(vm.call(to_json.as_function(), value, js_string(vm, key.to_string())));

Userland/Libraries/LibJS/Runtime/Object.cpp

@@ -449,8 +449,7 @@ ThrowCompletionOr<Object*> Object::copy_data_properties(Value source, HashTable<
     if (source.is_nullish())
         return this;
 
-    auto* from_object = source.to_object(global_object);
+    auto* from_object = MUST(source.to_object(global_object));
-    VERIFY(from_object);
 
     for (auto& next_key_value : TRY(from_object->internal_own_property_keys())) {
         auto next_key = PropertyName::from_value(global_object, next_key_value);
@@ -1035,15 +1034,12 @@ void Object::define_native_function(PropertyName const& property_name, Function<
 // 20.1.2.3.1 ObjectDefineProperties ( O, Properties ), https://tc39.es/ecma262/#sec-objectdefineproperties
 ThrowCompletionOr<Object*> Object::define_properties(Value properties)
 {
-    auto& vm = this->vm();
     auto& global_object = this->global_object();
 
     // 1. Assert: Type(O) is Object.
 
     // 2. Let props be ? ToObject(Properties).
-    auto* props = properties.to_object(global_object);
+    auto* props = TRY(properties.to_object(global_object));
-    if (auto* exception = vm.exception())
-        return throw_completion(exception->value());
 
     // 3. Let keys be ? props.[[OwnPropertyKeys]]().
     auto keys = TRY(props->internal_own_property_keys());

Userland/Libraries/LibJS/Runtime/ObjectConstructor.cpp

@@ -78,7 +78,7 @@ Value ObjectConstructor::construct(FunctionObject& new_target)
     auto value = vm.argument(0);
     if (value.is_nullish())
         return Object::create(global_object, global_object.object_prototype());
-    return value.to_object(global_object);
+    return TRY_OR_DISCARD(value.to_object(global_object));
 }
 
 enum class GetOwnPropertyKeysType {
@@ -92,9 +92,7 @@ static Array* get_own_property_keys(GlobalObject& global_object, Value value, Ge
     auto& vm = global_object.vm();
 
     // 1. Let obj be ? ToObject(O).
-    auto* object = value.to_object(global_object);
+    auto* object = TRY_OR_DISCARD(value.to_object(global_object));
-    if (vm.exception())
-        return {};
 
     // 2. Let keys be ? obj.[[OwnPropertyKeys]]().
     auto keys = TRY_OR_DISCARD(object->internal_own_property_keys());
@@ -133,9 +131,7 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::get_own_property_symbols)
 JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::get_prototype_of)
 {
     // 1. Let obj be ? ToObject(O).
-    auto* object = vm.argument(0).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.argument(0).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     // 2. Return ? obj.[[GetPrototypeOf]]().
     return TRY_OR_DISCARD(object->internal_get_prototype_of());
@@ -281,9 +277,7 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::seal)
 // 20.1.2.8 Object.getOwnPropertyDescriptor ( O, P ), https://tc39.es/ecma262/#sec-object.getownpropertydescriptor
 JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::get_own_property_descriptor)
 {
-    auto* object = vm.argument(0).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.argument(0).to_object(global_object));
-    if (vm.exception())
-        return {};
     auto key = vm.argument(1).to_property_key(global_object);
     if (vm.exception())
         return {};
@@ -295,9 +289,7 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::get_own_property_descriptor)
 JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::get_own_property_descriptors)
 {
     // 1. Let obj be ? ToObject(O).
-    auto* object = vm.argument(0).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.argument(0).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     // 2. Let ownKeys be ? obj.[[OwnPropertyKeys]]().
     auto own_keys = TRY_OR_DISCARD(object->internal_own_property_keys());
@@ -364,9 +356,7 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::is)
 // 20.1.2.17 Object.keys ( O ), https://tc39.es/ecma262/#sec-object.keys
 JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::keys)
 {
-    auto* object = vm.argument(0).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.argument(0).to_object(global_object));
-    if (vm.exception())
-        return {};
     auto name_list = TRY_OR_DISCARD(object->enumerable_own_property_names(PropertyKind::Key));
     return Array::create_from(global_object, name_list);
 }
@@ -374,9 +364,7 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::keys)
 // 20.1.2.22 Object.values ( O ), https://tc39.es/ecma262/#sec-object.values
 JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::values)
 {
-    auto* object = vm.argument(0).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.argument(0).to_object(global_object));
-    if (vm.exception())
-        return {};
     auto name_list = TRY_OR_DISCARD(object->enumerable_own_property_names(PropertyKind::Value));
     return Array::create_from(global_object, name_list);
 }
@@ -384,9 +372,7 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::values)
 // 20.1.2.5 Object.entries ( O ), https://tc39.es/ecma262/#sec-object.entries
 JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::entries)
 {
-    auto* object = vm.argument(0).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.argument(0).to_object(global_object));
-    if (vm.exception())
-        return {};
     auto name_list = TRY_OR_DISCARD(object->enumerable_own_property_names(PropertyKind::KeyAndValue));
     return Array::create_from(global_object, name_list);
 }
@@ -420,9 +406,7 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::create)
 JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::has_own)
 {
     // 1. Let obj be ? ToObject(O).
-    auto* object = vm.argument(0).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.argument(0).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     // 2. Let key be ? ToPropertyKey(P).
     auto key = vm.argument(1).to_property_key(global_object);
@@ -437,9 +421,7 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::has_own)
 JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::assign)
 {
     // 1. Let to be ? ToObject(target).
-    auto* to = vm.argument(0).to_object(global_object);
+    auto* to = TRY_OR_DISCARD(vm.argument(0).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     // 2. If only one argument was passed, return to.
     if (vm.argument_count() == 1)
@@ -454,8 +436,7 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectConstructor::assign)
             continue;
 
         // i. Let from be ! ToObject(nextSource).
-        auto from = next_source.to_object(global_object);
+        auto* from = MUST(next_source.to_object(global_object));
-        VERIFY(!vm.exception());
 
         // ii. Let keys be ? from.[[OwnPropertyKeys]]().
         auto keys = TRY_OR_DISCARD(from->internal_own_property_keys());

Userland/Libraries/LibJS/Runtime/ObjectPrototype.cpp

@@ -65,9 +65,7 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectPrototype::has_own_property)
     auto property_key = vm.argument(0).to_property_key(global_object);
     if (vm.exception())
         return {};
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
     return Value(TRY_OR_DISCARD(this_object->has_own_property(property_key)));
 }
 
@@ -85,8 +83,7 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectPrototype::to_string)
         return js_string(vm, "[object Null]");
 
     // 3. Let O be ! ToObject(this value).
-    auto* object = this_value.to_object(global_object);
+    auto* object = MUST(this_value.to_object(global_object));
-    VERIFY(object);
 
     // 4. Let isArray be ? IsArray(O).
     auto is_array = TRY_OR_DISCARD(Value(object).is_array(global_object));
@@ -150,7 +147,7 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectPrototype::to_locale_string)
 // 20.1.3.7 Object.prototype.valueOf ( ), https://tc39.es/ecma262/#sec-object.prototype.valueof
 JS_DEFINE_NATIVE_FUNCTION(ObjectPrototype::value_of)
 {
-    return vm.this_value(global_object).to_object(global_object);
+    return TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
 }
 
 // 20.1.3.4 Object.prototype.propertyIsEnumerable ( V ), https://tc39.es/ecma262/#sec-object.prototype.propertyisenumerable
@@ -161,9 +158,7 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectPrototype::property_is_enumerable)
     if (vm.exception())
         return {};
     // 2. Let O be ? ToObject(this value).
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
     // 3. Let desc be ? O.[[GetOwnProperty]](P).
     auto property_descriptor = TRY_OR_DISCARD(this_object->internal_get_own_property(property_key));
     // 4. If desc is undefined, return false.
@@ -180,9 +175,7 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectPrototype::is_prototype_of)
     if (!object_argument.is_object())
         return Value(false);
     auto* object = &object_argument.as_object();
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return {};
 
     for (;;) {
         object = TRY_OR_DISCARD(object->internal_get_prototype_of());
@@ -196,9 +189,7 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectPrototype::is_prototype_of)
 // B.2.2.2 Object.prototype.__defineGetter__ ( P, getter ), https://tc39.es/ecma262/#sec-object.prototype.__defineGetter__
 JS_DEFINE_NATIVE_FUNCTION(ObjectPrototype::define_getter)
 {
-    auto object = vm.this_value(global_object).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     auto getter = vm.argument(1);
     if (!getter.is_function()) {
@@ -220,9 +211,7 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectPrototype::define_getter)
 // B.2.2.3 Object.prototype.__defineSetter__ ( P, getter ), https://tc39.es/ecma262/#sec-object.prototype.__defineSetter__
 JS_DEFINE_NATIVE_FUNCTION(ObjectPrototype::define_setter)
 {
-    auto object = vm.this_value(global_object).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     auto setter = vm.argument(1);
     if (!setter.is_function()) {
@@ -244,9 +233,7 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectPrototype::define_setter)
 // B.2.2.4 Object.prototype.__lookupGetter__ ( P ), https://tc39.es/ecma262/#sec-object.prototype.__lookupGetter__
 JS_DEFINE_NATIVE_FUNCTION(ObjectPrototype::lookup_getter)
 {
-    auto object = vm.this_value(global_object).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     auto key = vm.argument(0).to_property_key(global_object);
     if (vm.exception())
@@ -268,9 +255,7 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectPrototype::lookup_getter)
 // B.2.2.5 Object.prototype.__lookupSetter__ ( P ), https://tc39.es/ecma262/#sec-object.prototype.__lookupSetter__
 JS_DEFINE_NATIVE_FUNCTION(ObjectPrototype::lookup_setter)
 {
-    auto* object = vm.this_value(global_object).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     auto key = vm.argument(0).to_property_key(global_object);
     if (vm.exception())
@@ -292,9 +277,7 @@ JS_DEFINE_NATIVE_FUNCTION(ObjectPrototype::lookup_setter)
 // B.2.2.1.1 get Object.prototype.__proto__, https://tc39.es/ecma262/#sec-get-object.prototype.__proto__
 JS_DEFINE_NATIVE_FUNCTION(ObjectPrototype::proto_getter)
 {
-    auto object = vm.this_value(global_object).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (vm.exception())
-        return {};
     return TRY_OR_DISCARD(object->internal_get_prototype_of());
 }
 

Userland/Libraries/LibJS/Runtime/PromiseConstructor.cpp

@@ -277,9 +277,7 @@ Value PromiseConstructor::construct(FunctionObject& new_target)
 // 27.2.4.1 Promise.all ( iterable ), https://tc39.es/ecma262/#sec-promise.all
 JS_DEFINE_NATIVE_FUNCTION(PromiseConstructor::all)
 {
-    auto* constructor = vm.this_value(global_object).to_object(global_object);
+    auto* constructor = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!constructor)
-        return {};
 
     auto promise_capability = new_promise_capability(global_object, constructor);
     if (vm.exception())
@@ -308,9 +306,7 @@ JS_DEFINE_NATIVE_FUNCTION(PromiseConstructor::all)
 // 27.2.4.2 Promise.allSettled ( iterable ), https://tc39.es/ecma262/#sec-promise.allsettled
 JS_DEFINE_NATIVE_FUNCTION(PromiseConstructor::all_settled)
 {
-    auto* constructor = vm.this_value(global_object).to_object(global_object);
+    auto* constructor = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!constructor)
-        return {};
 
     auto promise_capability = new_promise_capability(global_object, constructor);
     if (vm.exception())
@@ -339,9 +335,7 @@ JS_DEFINE_NATIVE_FUNCTION(PromiseConstructor::all_settled)
 // 27.2.4.3 Promise.any ( iterable ), https://tc39.es/ecma262/#sec-promise.any
 JS_DEFINE_NATIVE_FUNCTION(PromiseConstructor::any)
 {
-    auto* constructor = vm.this_value(global_object).to_object(global_object);
+    auto* constructor = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!constructor)
-        return {};
 
     auto promise_capability = new_promise_capability(global_object, constructor);
     if (vm.exception())
@@ -370,9 +364,7 @@ JS_DEFINE_NATIVE_FUNCTION(PromiseConstructor::any)
 // 27.2.4.5 Promise.race ( iterable ), https://tc39.es/ecma262/#sec-promise.race
 JS_DEFINE_NATIVE_FUNCTION(PromiseConstructor::race)
 {
-    auto* constructor = vm.this_value(global_object).to_object(global_object);
+    auto* constructor = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!constructor)
-        return {};
 
     auto promise_capability = new_promise_capability(global_object, constructor);
     if (vm.exception())
@@ -401,9 +393,7 @@ JS_DEFINE_NATIVE_FUNCTION(PromiseConstructor::race)
 // 27.2.4.6 Promise.reject ( r ), https://tc39.es/ecma262/#sec-promise.reject
 JS_DEFINE_NATIVE_FUNCTION(PromiseConstructor::reject)
 {
-    auto* constructor = vm.this_value(global_object).to_object(global_object);
+    auto* constructor = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!constructor)
-        return {};
     auto promise_capability = new_promise_capability(global_object, constructor);
     if (vm.exception())
         return {};
@@ -415,9 +405,7 @@ JS_DEFINE_NATIVE_FUNCTION(PromiseConstructor::reject)
 // 27.2.4.7 Promise.resolve ( x ), https://tc39.es/ecma262/#sec-promise.resolve
 JS_DEFINE_NATIVE_FUNCTION(PromiseConstructor::resolve)
 {
-    auto* constructor = vm.this_value(global_object).to_object(global_object);
+    auto* constructor = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!constructor)
-        return {};
     auto value = vm.argument(0);
     return promise_resolve(global_object, *constructor, value);
 }

Userland/Libraries/LibJS/Runtime/PromisePrototype.cpp

@@ -61,9 +61,7 @@ JS_DEFINE_NATIVE_FUNCTION(PromisePrototype::catch_)
 // 27.2.5.3 Promise.prototype.finally ( onFinally ), https://tc39.es/ecma262/#sec-promise.prototype.finally
 JS_DEFINE_NATIVE_FUNCTION(PromisePrototype::finally)
 {
-    auto* promise = vm.this_value(global_object).to_object(global_object);
+    auto* promise = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!promise)
-        return {};
     auto* constructor = TRY_OR_DISCARD(species_constructor(global_object, *promise, *global_object.promise_constructor()));
     Value then_finally;
     Value catch_finally;

Userland/Libraries/LibJS/Runtime/PrototypeObject.h

@@ -44,9 +44,7 @@ public:
     {
         auto& vm = global_object.vm();
 
-        auto* this_object = vm.this_value(global_object).to_object(global_object);
+        auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-        if (!this_object)
-            return nullptr;
 
         if (!is<ObjectType>(this_object)) {
             vm.throw_exception<TypeError>(global_object, ErrorType::NotAnObjectOfType, PrototypeType::display_name());

Userland/Libraries/LibJS/Runtime/Reference.cpp

@@ -32,9 +32,10 @@ void Reference::put_value(GlobalObject& global_object, Value value)
     }
 
     if (is_property_reference()) {
-        auto* base_obj = m_base_value.to_object(global_object);
+        auto base_obj_or_error = m_base_value.to_object(global_object);
-        if (!base_obj)
+        if (base_obj_or_error.is_error())
             return;
+        auto* base_obj = base_obj_or_error.release_value();
 
         auto succeeded_or_error = base_obj->internal_set(m_name, value, get_this_value());
         if (succeeded_or_error.is_error())
@@ -74,9 +75,7 @@ Value Reference::get_value(GlobalObject& global_object) const
     }
 
     if (is_property_reference()) {
-        auto* base_obj = m_base_value.to_object(global_object);
+        auto* base_obj = TRY_OR_DISCARD(m_base_value.to_object(global_object));
-        if (!base_obj)
-            return {};
         return TRY_OR_DISCARD(base_obj->get(m_name));
     }
 
@@ -121,8 +120,7 @@ bool Reference::delete_(GlobalObject& global_object)
         }
 
         // c. Let baseObj be ! ToObject(ref.[[Base]]).
-        auto* base_obj = m_base_value.to_object(global_object);
+        auto* base_obj = MUST(m_base_value.to_object(global_object));
-        VERIFY(base_obj);
 
         // d. Let deleteStatus be ? baseObj.[[Delete]](ref.[[ReferencedName]]).
         bool delete_status = TRY_OR_DISCARD(base_obj->internal_delete(m_name));

Userland/Libraries/LibJS/Runtime/RegExpPrototype.cpp

@@ -420,9 +420,7 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::symbol_match)
             return array;
         }
 
-        auto* result_object = result.to_object(global_object);
+        auto* result_object = TRY_OR_DISCARD(result.to_object(global_object));
-        if (!result_object)
-            return {};
         auto match_object = TRY_OR_DISCARD(result_object->get(0));
         auto match_str = TRY_OR_DISCARD(match_object.to_string(global_object));
 
@@ -458,10 +456,7 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::symbol_match_all)
     auto matcher_value = vm.construct(*constructor, *constructor, move(arguments));
     if (vm.exception())
         return {};
-    auto* matcher = matcher_value.to_object(global_object);
+    auto* matcher = TRY_OR_DISCARD(matcher_value.to_object(global_object));
-    if (!matcher)
-        return {};
-
     auto last_index = TRY_OR_DISCARD(regexp_object->get(vm.names.lastIndex)).to_length(global_object);
     if (vm.exception())
         return {};
@@ -506,10 +501,7 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::symbol_replace)
         if (result.is_null())
             break;
 
-        auto* result_object = result.to_object(global_object);
+        auto* result_object = TRY_OR_DISCARD(result.to_object(global_object));
-        if (!result_object)
-            return {};
-
         results.append(result_object);
         if (!global)
             break;
@@ -566,14 +558,10 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::symbol_replace)
             auto replace_result = TRY_OR_DISCARD(vm.call(replace_value.as_function(), js_undefined(), move(replacer_args)));
             replacement = TRY_OR_DISCARD(replace_result.to_string(global_object));
         } else {
-            auto named_captures_object = js_undefined();
+            if (!named_captures.is_undefined())
-            if (!named_captures.is_undefined()) {
+                named_captures = TRY_OR_DISCARD(named_captures.to_object(global_object));
-                named_captures_object = named_captures.to_object(global_object);
-                if (vm.exception())
-                    return {};
-            }
 
-            replacement = TRY_OR_DISCARD(get_substitution(global_object, matched.view(), string_view, position, captures, named_captures_object, replace_value));
+            replacement = TRY_OR_DISCARD(get_substitution(global_object, matched.view(), string_view, position, captures, named_captures, replace_value));
         }
 
         if (position >= next_source_position) {
@@ -618,10 +606,7 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::symbol_search)
     if (result.is_null())
         return Value(-1);
 
-    auto* result_object = result.to_object(global_object);
+    auto* result_object = TRY_OR_DISCARD(result.to_object(global_object));
-    if (!result_object)
-        return {};
-
     return TRY_OR_DISCARD(result_object->get(vm.names.index));
 }
 
@@ -649,10 +634,7 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::symbol_split)
     auto splitter_value = vm.construct(*constructor, *constructor, move(arguments));
     if (vm.exception())
         return {};
-    auto* splitter = splitter_value.to_object(global_object);
+    auto* splitter = TRY_OR_DISCARD(splitter_value.to_object(global_object));
-    if (!splitter)
-        return {};
-
     auto* array = Array::create(global_object, 0);
     size_t array_length = 0;
 
@@ -705,12 +687,8 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpPrototype::symbol_split)
         if (++array_length == limit)
             return array;
 
-        auto* result_object = result.to_object(global_object);
+        auto* result_object = TRY_OR_DISCARD(result.to_object(global_object));
-        if (!result_object)
-            return {};
         auto number_of_captures = TRY_OR_DISCARD(length_of_array_like(global_object, *result_object));
-        if (vm.exception())
-            return {};
         if (number_of_captures > 0)
             --number_of_captures;
 

Userland/Libraries/LibJS/Runtime/RegExpStringIteratorPrototype.cpp

@@ -54,9 +54,7 @@ JS_DEFINE_NATIVE_FUNCTION(RegExpStringIteratorPrototype::next)
         return create_iterator_result_object(global_object, match, false);
     }
 
-    auto* match_object = match.to_object(global_object);
+    auto* match_object = TRY_OR_DISCARD(match.to_object(global_object));
-    if (!match_object)
-        return {};
     auto match_string_value = TRY_OR_DISCARD(match_object->get(0));
     auto match_string = TRY_OR_DISCARD(match_string_value.to_string(global_object));
     if (match_string.is_empty()) {

Userland/Libraries/LibJS/Runtime/StringConstructor.cpp

@@ -69,17 +69,10 @@ Value StringConstructor::construct(FunctionObject& new_target)
 // 22.1.2.4 String.raw ( template, ...substitutions ), https://tc39.es/ecma262/#sec-string.raw
 JS_DEFINE_NATIVE_FUNCTION(StringConstructor::raw)
 {
-    auto* cooked = vm.argument(0).to_object(global_object);
+    auto* cooked = TRY_OR_DISCARD(vm.argument(0).to_object(global_object));
-    if (vm.exception())
+    auto raw_value = TRY_OR_DISCARD(cooked->get(vm.names.raw));
-        return {};
+    auto* raw = TRY_OR_DISCARD(raw_value.to_object(global_object));
-
-    auto* raw = TRY_OR_DISCARD(cooked->get(vm.names.raw)).to_object(global_object);
-    if (vm.exception())
-        return {};
-
     auto literal_segments = TRY_OR_DISCARD(length_of_array_like(global_object, *raw));
-    if (vm.exception())
-        return {};
 
     if (literal_segments == 0)
         return js_string(vm, "");

Userland/Libraries/LibJS/Runtime/Temporal/Calendar.cpp

@@ -421,9 +421,7 @@ ThrowCompletionOr<PlainDate*> date_from_fields(GlobalObject& global_object, Obje
     auto date = TRY(Value(&calendar).invoke(global_object, vm.names.dateFromFields, &fields, &options));
 
     // 4. Perform ? RequireInternalSlot(date, [[InitializedTemporalDate]]).
-    auto* date_object = date.to_object(global_object);
+    auto* date_object = TRY(date.to_object(global_object));
-    if (auto* exception = vm.exception())
-        return throw_completion(exception->value());
     if (!is<PlainDate>(date_object))
         return vm.throw_completion<TypeError>(global_object, ErrorType::NotAnObjectOfType, "Temporal.PlainDate");
 
@@ -447,9 +445,7 @@ ThrowCompletionOr<PlainYearMonth*> year_month_from_fields(GlobalObject& global_o
     auto year_month = TRY(Value(&calendar).invoke(global_object, vm.names.yearMonthFromFields, &fields, options ?: js_undefined()));
 
     // 6. Perform ? RequireInternalSlot(yearMonth, [[InitializedTemporalYearMonth]]).
-    auto* year_month_object = year_month.to_object(global_object);
+    auto* year_month_object = TRY(year_month.to_object(global_object));
-    if (auto* exception = vm.exception())
-        return throw_completion(exception->value());
     if (!is<PlainYearMonth>(year_month_object))
         return vm.throw_completion<TypeError>(global_object, ErrorType::NotAnObjectOfType, "Temporal.PlainYearMonth");
 
@@ -473,9 +469,7 @@ ThrowCompletionOr<PlainMonthDay*> month_day_from_fields(GlobalObject& global_obj
     auto month_day = TRY(Value(&calendar).invoke(global_object, vm.names.monthDayFromFields, &fields, options ?: js_undefined()));
 
     // 6. Perform ? RequireInternalSlot(monthDay, [[InitializedTemporalMonthDay]]).
-    auto* month_day_object = month_day.to_object(global_object);
+    auto* month_day_object = TRY(month_day.to_object(global_object));
-    if (auto* exception = vm.exception())
-        return throw_completion(exception->value());
     if (!is<PlainMonthDay>(month_day_object))
         return vm.throw_completion<TypeError>(global_object, ErrorType::NotAnObjectOfType, "Temporal.PlainMonthDay");
 

Userland/Libraries/LibJS/Runtime/Temporal/CalendarPrototype.cpp

@@ -604,14 +604,10 @@ JS_DEFINE_NATIVE_FUNCTION(CalendarPrototype::merge_fields)
     VERIFY(calendar->identifier() == "iso8601"sv);
 
     // 4. Set fields to ? ToObject(fields).
-    auto* fields = vm.argument(0).to_object(global_object);
+    auto* fields = TRY_OR_DISCARD(vm.argument(0).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     // 5. Set additionalFields to ? ToObject(additionalFields).
-    auto* additional_fields = vm.argument(1).to_object(global_object);
+    auto* additional_fields = TRY_OR_DISCARD(vm.argument(1).to_object(global_object));
-    if (vm.exception())
-        return {};
 
     // 6. Return ? DefaultMergeFields(fields, additionalFields).
     return TRY_OR_DISCARD(default_merge_fields(global_object, *fields, *additional_fields));

Userland/Libraries/LibJS/Runtime/TypedArray.cpp

@@ -21,9 +21,7 @@ TypedArrayBase* typed_array_from(GlobalObject& global_object, Value typed_array_
 {
     auto& vm = global_object.vm();
 
-    auto* this_object = typed_array_value.to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(typed_array_value.to_object(global_object));
-    if (!this_object)
-        return nullptr;
     if (!this_object->is_typed_array()) {
         vm.throw_exception<TypeError>(global_object, ErrorType::NotAnObjectOfType, "TypedArray");
         return nullptr;

Userland/Libraries/LibJS/Runtime/TypedArrayConstructor.cpp

@@ -100,7 +100,7 @@ JS_DEFINE_NATIVE_FUNCTION(TypedArrayConstructor::from)
         return target_object;
     }
 
-    auto array_like = source.to_object(global_object);
+    auto array_like = MUST(source.to_object(global_object));
     auto length = TRY_OR_DISCARD(length_of_array_like(global_object, *array_like));
 
     MarkedValueList arguments(vm.heap());

Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.cpp

@@ -790,10 +790,7 @@ JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::set)
         auto target_length = typed_array->array_length();
         auto target_byte_offset = typed_array->byte_offset();
 
-        auto src = source.to_object(global_object);
+        auto src = TRY_OR_DISCARD(source.to_object(global_object));
-        if (vm.exception())
-            return {};
-
         auto source_length = TRY_OR_DISCARD(length_of_array_like(global_object, *src));
 
         if (isinf(target_offset)) {

Userland/Libraries/LibJS/Runtime/VM.cpp

@@ -220,11 +220,7 @@ ThrowCompletionOr<void> VM::binding_initialization(NonnullRefPtr<BindingPattern>
 // 14.3.3.1 Runtime Semantics: PropertyBindingInitialization, https://tc39.es/ecma262/#sec-destructuring-binding-patterns-runtime-semantics-propertybindinginitialization
 ThrowCompletionOr<void> VM::property_binding_initialization(BindingPattern const& binding, Value value, Environment* environment, GlobalObject& global_object)
 {
-    auto* object = value.to_object(global_object);
+    auto* object = TRY(value.to_object(global_object));
-    if (!object) {
-        VERIFY(exception());
-        return JS::throw_completion(exception()->value());
-    }
 
     HashTable<PropertyName, PropertyNameTraits> seen_names;
     for (auto& property : binding.entries) {

Userland/Libraries/LibJS/Runtime/Value.cpp

@@ -434,13 +434,12 @@ ThrowCompletionOr<Value> Value::to_primitive(GlobalObject& global_object, Prefer
 }
 
 // 7.1.18 ToObject ( argument ), https://tc39.es/ecma262/#sec-toobject
-Object* Value::to_object(GlobalObject& global_object) const
+ThrowCompletionOr<Object*> Value::to_object(GlobalObject& global_object) const
 {
     switch (m_type) {
     case Type::Undefined:
     case Type::Null:
-        global_object.vm().throw_exception<TypeError>(global_object, ErrorType::ToObjectNullOrUndefined);
+        return global_object.vm().throw_completion<TypeError>(global_object, ErrorType::ToObjectNullOrUndefined);
-        return nullptr;
     case Type::Boolean:
         return BooleanObject::create(global_object, m_value.as_bool);
     case Type::Int32:
@@ -455,7 +454,6 @@ Object* Value::to_object(GlobalObject& global_object) const
     case Type::Object:
         return &const_cast<Object&>(as_object());
     default:
-        dbgln("Dying because I can't to_object() on {}", *this);
         VERIFY_NOT_REACHED();
     }
 }
@@ -780,15 +778,11 @@ double Value::to_integer_or_infinity(GlobalObject& global_object) const
 // 7.3.3 GetV ( V, P ), https://tc39.es/ecma262/#sec-getv
 Value Value::get(GlobalObject& global_object, PropertyName const& property_name) const
 {
-    auto& vm = global_object.vm();
-
     // 1. Assert: IsPropertyKey(P) is true.
     VERIFY(property_name.is_valid());
 
     // 2. Let O be ? ToObject(V).
-    auto* object = to_object(global_object);
+    auto* object = TRY_OR_DISCARD(to_object(global_object));
-    if (vm.exception())
-        return {};
 
     // 3. Return ? O.[[Get]](P, V).
     return TRY_OR_DISCARD(object->internal_get(property_name, *this));

Userland/Libraries/LibJS/Runtime/Value.h

@@ -307,7 +307,7 @@ public:
     ThrowCompletionOr<Utf16String> to_utf16_string(GlobalObject&) const;
     ThrowCompletionOr<PrimitiveString*> to_primitive_string(GlobalObject&);
     ThrowCompletionOr<Value> to_primitive(GlobalObject&, PreferredType preferred_type = PreferredType::Default) const;
-    Object* to_object(GlobalObject&) const;
+    ThrowCompletionOr<Object*> to_object(GlobalObject&) const;
     Value to_numeric(GlobalObject&) const;
     Value to_number(GlobalObject&) const;
     BigInt* to_bigint(GlobalObject&) const;

Userland/Libraries/LibWeb/Bindings/WindowObject.cpp

@@ -170,8 +170,7 @@ static DOM::Window* impl_from(JS::VM& vm, JS::GlobalObject& global_object)
         this_value = global_object.value_of();
     }
 
-    auto* this_object = this_value.to_object(global_object);
+    auto* this_object = MUST(this_value.to_object(global_object));
-    VERIFY(this_object);
 
     if (StringView("WindowObject") != this_object->class_name()) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAnObjectOfType, "WindowObject");
@@ -343,9 +342,7 @@ JS_DEFINE_NATIVE_FUNCTION(WindowObject::request_animation_frame)
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::BadArgCountOne, "requestAnimationFrame");
         return {};
     }
-    auto* callback_object = vm.argument(0).to_object(global_object);
+    auto* callback_object = TRY_OR_DISCARD(vm.argument(0).to_object(global_object));
-    if (!callback_object)
-        return {};
     if (!callback_object->is_function()) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAFunctionNoParam);
         return {};
@@ -378,9 +375,7 @@ JS_DEFINE_NATIVE_FUNCTION(WindowObject::queue_microtask)
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::BadArgCountAtLeastOne, "queueMicrotask");
         return {};
     }
-    auto* callback_object = vm.argument(0).to_object(global_object);
+    auto* callback_object = TRY_OR_DISCARD(vm.argument(0).to_object(global_object));
-    if (!callback_object)
-        return {};
     if (!callback_object->is_function()) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAFunctionNoParam);
         return {};
@@ -545,10 +540,7 @@ JS_DEFINE_NATIVE_FUNCTION(WindowObject::get_computed_style)
     auto* impl = impl_from(vm, global_object);
     if (!impl)
         return {};
-    auto* object = vm.argument(0).to_object(global_object);
+    auto* object = TRY_OR_DISCARD(vm.argument(0).to_object(global_object));
-    if (vm.exception())
-        return {};
-
     if (!is<ElementWrapper>(object)) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAnObjectOfType, "DOM element");
         return {};
@@ -624,10 +616,7 @@ JS_DEFINE_NATIVE_FUNCTION(WindowObject::scroll)
     String behavior_string = "auto";
 
     if (vm.argument_count() == 1) {
-        auto* options = vm.argument(0).to_object(global_object);
+        auto* options = TRY_OR_DISCARD(vm.argument(0).to_object(global_object));
-        if (vm.exception())
-            return {};
-
         auto left = TRY_OR_DISCARD(options->get("left"));
         if (!left.is_undefined())
             x_value = left;
@@ -684,9 +673,7 @@ JS_DEFINE_NATIVE_FUNCTION(WindowObject::scroll_by)
     if (vm.argument_count() == 0) {
         options = JS::Object::create(global_object, nullptr);
     } else if (vm.argument_count() == 1) {
-        options = vm.argument(0).to_object(global_object);
+        options = TRY_OR_DISCARD(vm.argument(0).to_object(global_object));
-        if (vm.exception())
-            return {};
     } else if (vm.argument_count() >= 2) {
         // We ignore arguments 2+ in line with behavior of Chrome and Firefox
         options = JS::Object::create(global_object, nullptr);

Userland/Libraries/LibWeb/WebAssembly/WebAssemblyInstanceConstructor.cpp

@@ -33,11 +33,7 @@ JS::Value WebAssemblyInstanceConstructor::construct(FunctionObject&)
 {
     auto& vm = this->vm();
     auto& global_object = this->global_object();
-
+    auto* module_argument = TRY_OR_DISCARD(vm.argument(0).to_object(global_object));
-    auto module_argument = vm.argument(0).to_object(global_object);
-    if (vm.exception())
-        return {};
-
     if (!is<WebAssemblyModuleObject>(module_argument)) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAnObjectOfType, "WebAssembly.Module");
         return {};

Userland/Libraries/LibWeb/WebAssembly/WebAssemblyInstanceObjectPrototype.cpp

@@ -19,9 +19,7 @@ void WebAssemblyInstancePrototype::initialize(JS::GlobalObject& global_object)
 JS_DEFINE_NATIVE_FUNCTION(WebAssemblyInstancePrototype::exports_getter)
 {
     auto this_value = vm.this_value(global_object);
-    auto this_object = this_value.to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(this_value.to_object(global_object));
-    if (vm.exception())
-        return {};
     if (!is<WebAssemblyInstanceObject>(this_object)) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAnObjectOfType, "WebAssembly.Instance");
         return {};

Userland/Libraries/LibWeb/WebAssembly/WebAssemblyMemoryConstructor.cpp

@@ -32,10 +32,7 @@ JS::Value WebAssemblyMemoryConstructor::construct(FunctionObject&)
     auto& vm = this->vm();
     auto& global_object = this->global_object();
 
-    auto descriptor = vm.argument(0).to_object(global_object);
+    auto descriptor = TRY_OR_DISCARD(vm.argument(0).to_object(global_object));
-    if (vm.exception())
-        return {};
-
     auto initial_value = TRY_OR_DISCARD(descriptor->get("initial"));
     auto maximum_value = TRY_OR_DISCARD(descriptor->get("maximum"));
 

Userland/Libraries/LibWeb/WebAssembly/WebAssemblyMemoryPrototype.cpp

@@ -22,8 +22,8 @@ JS_DEFINE_NATIVE_FUNCTION(WebAssemblyMemoryPrototype::grow)
     auto page_count = vm.argument(0).to_u32(global_object);
     if (vm.exception())
         return {};
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object || !is<WebAssemblyMemoryObject>(this_object)) {
+    if (!is<WebAssemblyMemoryObject>(this_object)) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAnObjectOfType, "WebAssembly.Memory");
         return {};
     }
@@ -44,8 +44,8 @@ JS_DEFINE_NATIVE_FUNCTION(WebAssemblyMemoryPrototype::grow)
 
 JS_DEFINE_NATIVE_FUNCTION(WebAssemblyMemoryPrototype::buffer_getter)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object || !is<WebAssemblyMemoryObject>(this_object)) {
+    if (!is<WebAssemblyMemoryObject>(this_object)) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAnObjectOfType, "WebAssembly.Memory");
         return {};
     }

Userland/Libraries/LibWeb/WebAssembly/WebAssemblyModuleConstructor.cpp

@@ -34,10 +34,7 @@ JS::Value WebAssemblyModuleConstructor::construct(FunctionObject&)
     auto& vm = this->vm();
     auto& global_object = this->global_object();
 
-    auto buffer_object = vm.argument(0).to_object(global_object);
+    auto* buffer_object = TRY_OR_DISCARD(vm.argument(0).to_object(global_object));
-    if (vm.exception())
-        return {};
-
     auto result = parse_module(global_object, buffer_object);
     if (result.is_error()) {
         vm.throw_exception(global_object, result.error());

Userland/Libraries/LibWeb/WebAssembly/WebAssemblyObject.cpp

@@ -130,17 +130,19 @@ Result<size_t, JS::Value> parse_module(JS::GlobalObject& global_object, JS::Obje
 JS_DEFINE_NATIVE_FUNCTION(WebAssemblyObject::compile)
 {
     // FIXME: This shouldn't block!
-    auto buffer = vm.argument(0).to_object(global_object);
+    auto buffer_or_error = vm.argument(0).to_object(global_object);
     JS::Value rejection_value;
-    if (vm.exception()) {
+    if (buffer_or_error.is_error()) {
-        rejection_value = vm.exception()->value();
+        rejection_value = buffer_or_error.throw_completion().value();
         vm.clear_exception();
+        vm.stop_unwind();
     }
     auto promise = JS::Promise::create(global_object);
     if (!rejection_value.is_empty()) {
         promise->reject(rejection_value);
         return promise;
     }
+    auto* buffer = buffer_or_error.release_value();
     auto result = parse_module(global_object, buffer);
     if (result.is_error())
         promise->reject(result.error());
@@ -155,11 +157,13 @@ Result<size_t, JS::Value> WebAssemblyObject::instantiate_module(Wasm::Module con
     HashMap<Wasm::Linker::Name, Wasm::ExternValue> resolved_imports;
     auto import_argument = vm.argument(1);
     if (!import_argument.is_undefined()) {
-        [[maybe_unused]] auto import_object = import_argument.to_object(global_object);
+        auto import_object_or_error = import_argument.to_object(global_object);
-        if (auto exception = vm.exception()) {
+        if (import_object_or_error.is_error()) {
             vm.clear_exception();
-            return exception->value();
+            vm.stop_unwind();
+            return import_object_or_error.throw_completion().value();
         }
+        [[maybe_unused]] auto* import_object = import_object_or_error.release_value();
 
         dbgln("Trying to resolve stuff because import object was specified");
         for (const Wasm::Linker::Name& import_name : linker.unresolved_imports()) {
@@ -168,10 +172,10 @@ Result<size_t, JS::Value> WebAssemblyObject::instantiate_module(Wasm::Module con
             if (value_or_error.is_error())
                 break;
             auto value = value_or_error.release_value();
-            auto object = value.to_object(global_object);
+            auto object_or_error = value.to_object(global_object);
-            if (vm.exception())
+            if (object_or_error.is_error())
                 break;
-
+            auto* object = object_or_error.release_value();
             auto import_or_error = object->get(import_name.name);
             if (import_or_error.is_error())
                 break;
@@ -307,22 +311,17 @@ Result<size_t, JS::Value> WebAssemblyObject::instantiate_module(Wasm::Module con
 JS_DEFINE_NATIVE_FUNCTION(WebAssemblyObject::instantiate)
 {
     // FIXME: This shouldn't block!
-    auto buffer = vm.argument(0).to_object(global_object);
+    auto buffer_or_error = vm.argument(0).to_object(global_object);
     auto promise = JS::Promise::create(global_object);
     bool should_return_module = false;
-    auto take_exception_and_reject_if_needed = [&] {
+    if (buffer_or_error.is_error()) {
-        if (vm.exception()) {
+        auto rejection_value = buffer_or_error.throw_completion().value();
-            auto rejection_value = vm.exception()->value();
+        vm.clear_exception();
-            vm.clear_exception();
+        vm.stop_unwind();
-            promise->reject(rejection_value);
+        promise->reject(rejection_value);
-            return true;
-        }
-
-        return false;
-    };
-
-    if (take_exception_and_reject_if_needed())
         return promise;
+    }
+    auto* buffer = buffer_or_error.release_value();
 
     const Wasm::Module* module { nullptr };
     if (is<JS::ArrayBuffer>(buffer) || is<JS::TypedArrayBase>(buffer)) {

Userland/Libraries/LibWeb/WebAssembly/WebAssemblyTableConstructor.cpp

@@ -34,10 +34,7 @@ JS::Value WebAssemblyTableConstructor::construct(FunctionObject&)
     auto& vm = this->vm();
     auto& global_object = this->global_object();
 
-    auto descriptor = vm.argument(0).to_object(global_object);
+    auto descriptor = TRY_OR_DISCARD(vm.argument(0).to_object(global_object));
-    if (vm.exception())
-        return {};
-
     auto element_value = TRY_OR_DISCARD(descriptor->get("element"));
     if (!element_value.is_string()) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::InvalidHint, element_value.to_string_without_side_effects());

Userland/Libraries/LibWeb/WebAssembly/WebAssemblyTablePrototype.cpp

@@ -24,8 +24,8 @@ JS_DEFINE_NATIVE_FUNCTION(WebAssemblyTablePrototype::grow)
     auto delta = vm.argument(0).to_u32(global_object);
     if (vm.exception())
         return {};
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object || !is<WebAssemblyTableObject>(this_object)) {
+    if (!is<WebAssemblyTableObject>(this_object)) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAnObjectOfType, "WebAssembly.Table");
         return {};
     }
@@ -63,8 +63,8 @@ JS_DEFINE_NATIVE_FUNCTION(WebAssemblyTablePrototype::get)
     if (vm.exception())
         return {};
 
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object || !is<WebAssemblyTableObject>(this_object)) {
+    if (!is<WebAssemblyTableObject>(this_object)) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAnObjectOfType, "WebAssembly.Table");
         return {};
     }
@@ -93,8 +93,8 @@ JS_DEFINE_NATIVE_FUNCTION(WebAssemblyTablePrototype::set)
     if (vm.exception())
         return {};
 
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object || !is<WebAssemblyTableObject>(this_object)) {
+    if (!is<WebAssemblyTableObject>(this_object)) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAnObjectOfType, "WebAssembly.Table");
         return {};
     }
@@ -128,8 +128,8 @@ JS_DEFINE_NATIVE_FUNCTION(WebAssemblyTablePrototype::set)
 
 JS_DEFINE_NATIVE_FUNCTION(WebAssemblyTablePrototype::length_getter)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object || !is<WebAssemblyTableObject>(this_object)) {
+    if (!is<WebAssemblyTableObject>(this_object)) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAnObjectOfType, "WebAssembly.Table");
         return {};
     }

Userland/Services/WebContent/ConsoleGlobalObject.cpp

@@ -100,9 +100,7 @@ JS::ThrowCompletionOr<JS::MarkedValueList> ConsoleGlobalObject::internal_own_pro
 
 JS_DEFINE_NATIVE_GETTER(ConsoleGlobalObject::inspected_node_getter)
 {
-    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    auto* this_object = TRY_OR_DISCARD(vm.this_value(global_object).to_object(global_object));
-    if (!this_object)
-        return JS::js_null();
 
     if (!is<ConsoleGlobalObject>(this_object)) {
         vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::NotAnObjectOfType, "ConsoleGlobalObject");

Userland/Utilities/js.cpp

@@ -1347,7 +1347,7 @@ int main(int argc, char** argv)
                 if (!variable.is_object())
                     break;
 
-                auto const* object = variable.to_object(interpreter->global_object());
+                auto const* object = MUST(variable.to_object(interpreter->global_object()));
                 auto const& shape = object->shape();
                 list_all_properties(shape, property_name);
                 if (results.size())