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LibJS: Convert initialize_typed_array_from_list() to ThrowCompletionOr

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Also add spec step comments to it while we're here.
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Linus Groh 2021-10-03 20:54:54 +01:00
parent d551e0e55e
commit 04ff12740c
1 changed files with 28 additions and 18 deletions
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46
Userland/Libraries/LibJS/Runtime/TypedArray.cpp
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@ -302,36 +302,46 @@ static ThrowCompletionOr<void> initialize_typed_array_from_array_like(GlobalObje
// 23.2.5.1.4 InitializeTypedArrayFromList, https://tc39.es/ecma262/#sec-initializetypedarrayfromlist
template<typename T>
static void initialize_typed_array_from_list(GlobalObject& global_object, TypedArray<T>& typed_array, const MarkedValueList& list)
static ThrowCompletionOr<void> initialize_typed_array_from_list(GlobalObject& global_object, TypedArray<T>& typed_array, const MarkedValueList& list)
{
auto& vm = global_object.vm();
// 1. Let len be the number of elements in values.
auto length = list.size();
// 2. Perform ? AllocateTypedArrayBuffer(O, len).
// Enforce 2GB "Excessive Length" limit
if (list.size() > NumericLimits<i32>::max() / sizeof(T)) {
vm.throw_exception<RangeError>(global_object, ErrorType::InvalidLength, "typed array");
return;
}
if (length > NumericLimits<i32>::max() / sizeof(T))
return vm.template throw_completion<RangeError>(global_object, ErrorType::InvalidLength, "typed array");
auto element_size = typed_array.element_size();
if (Checked<size_t>::multiplication_would_overflow(element_size, list.size())) {
vm.throw_exception<RangeError>(global_object, ErrorType::InvalidLength, "typed array");
return;
}
auto byte_length = element_size * list.size();
if (Checked<size_t>::multiplication_would_overflow(element_size, length))
return vm.template throw_completion<RangeError>(global_object, ErrorType::InvalidLength, "typed array");
auto byte_length = element_size * length;
auto array_buffer = ArrayBuffer::create(global_object, byte_length);
if (!array_buffer)
return;
if (auto* exception = vm.exception())
return throw_completion(exception->value());
typed_array.set_viewed_array_buffer(array_buffer);
typed_array.set_byte_length(byte_length);
typed_array.set_byte_offset(0);
typed_array.set_array_length(list.size());
typed_array.set_array_length(length);
for (size_t k = 0; k < list.size(); k++) {
// 3. Let k be 0.
// 4. Repeat, while k < len,
for (size_t k = 0; k < length; k++) {
// a. Let Pk be ! ToString(𝔽(k)).
// b. Let kValue be the first element of values and remove that element from values.
auto value = list[k];
auto result_or_error = typed_array.set(k, value, Object::ShouldThrowExceptions::Yes);
if (result_or_error.is_error())
return;
// c. Perform ? Set(O, Pk, kValue, true).
TRY(typed_array.set(k, value, Object::ShouldThrowExceptions::Yes));
// d. Set k to k + 1.
}
return {};
}
// 23.2.4.2 TypedArrayCreate ( constructor, argumentList ), https://tc39.es/ecma262/#typedarray-create
@ -466,7 +476,7 @@ void TypedArrayBase::visit_edges(Visitor& visitor)
auto values = iterable_to_list(global_object(), first_argument, iterator); \
if (vm.exception()) \
return {}; \
initialize_typed_array_from_list(global_object(), *typed_array, values); \
TRY_OR_DISCARD(initialize_typed_array_from_list(global_object(), *typed_array, values)); \
} else { \
TRY_OR_DISCARD(initialize_typed_array_from_array_like(global_object(), *typed_array, first_argument.as_object())); \
} \