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LibWeb: Use as_if instead of dynamic_cast in a few places

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Tim Ledbetter
2025-01-31 09:49:16 +00:00
committed by Alexander Kalenik
parent fb56da4144
commit 8dfd382e12
2 changed files with 11 additions and 16 deletions
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22
Libraries/LibWeb/HTML/StructuredSerialize.cpp
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@@ -1211,8 +1211,8 @@ WebIDL::ExceptionOr<SerializedTransferRecord> structured_serialize_with_transfer
// 5. For each transferable of transferList:
for (auto& transferable : transfer_list) {
auto is_array_buffer = is<JS::ArrayBuffer>(*transferable);
auto is_detached = is_array_buffer && dynamic_cast<JS::ArrayBuffer&>(*transferable).is_detached();
auto array_buffer = as_if<JS::ArrayBuffer>(*transferable);
auto is_detached = array_buffer && array_buffer->is_detached();
// 1. If transferable has an [[ArrayBufferData]] internal slot and IsDetachedBuffer(transferable) is true, then throw a "DataCloneError" DOMException.
if (is_detached) {
@@ -1220,9 +1220,8 @@ WebIDL::ExceptionOr<SerializedTransferRecord> structured_serialize_with_transfer
}
// 2. If transferable has a [[Detached]] internal slot and transferable.[[Detached]] is true, then throw a "DataCloneError" DOMException.
if (is<Bindings::Transferable>(*transferable)) {
auto& transferable_object = dynamic_cast<Bindings::Transferable&>(*transferable);
if (transferable_object.is_detached()) {
if (auto* transferable_object = as_if<Bindings::Transferable>(*transferable)) {
if (transferable_object->is_detached()) {
return WebIDL::DataCloneError::create(*vm.current_realm(), "Value already transferred"_string);
}
}
@@ -1232,17 +1231,16 @@ WebIDL::ExceptionOr<SerializedTransferRecord> structured_serialize_with_transfer
TransferDataHolder data_holder;
// 4. If transferable has an [[ArrayBufferData]] internal slot, then:
if (is_array_buffer) {
if (array_buffer) {
// 1. If transferable has an [[ArrayBufferMaxByteLength]] internal slot, then:
auto& array_buffer = dynamic_cast<JS::ArrayBuffer&>(*transferable);
if (!array_buffer.is_fixed_length()) {
if (!array_buffer->is_fixed_length()) {
// 1. Set dataHolder.[[Type]] to "ResizableArrayBuffer".
// 2. Set dataHolder.[[ArrayBufferData]] to transferable.[[ArrayBufferData]].
// 3. Set dataHolder.[[ArrayBufferByteLength]] to transferable.[[ArrayBufferByteLength]].
// 4. Set dataHolder.[[ArrayBufferMaxByteLength]] to transferable.[[ArrayBufferMaxByteLength]].
serialize_enum<TransferType>(data_holder.data, TransferType::ResizableArrayBuffer);
MUST(serialize_bytes(vm, data_holder.data, array_buffer.buffer().bytes())); // serializes both byte length and bytes
serialize_primitive_type<size_t>(data_holder.data, array_buffer.max_byte_length());
MUST(serialize_bytes(vm, data_holder.data, array_buffer->buffer().bytes())); // serializes both byte length and bytes
serialize_primitive_type<size_t>(data_holder.data, array_buffer->max_byte_length());
}
// 2. Otherwise:
@@ -1251,12 +1249,12 @@ WebIDL::ExceptionOr<SerializedTransferRecord> structured_serialize_with_transfer
// 2. Set dataHolder.[[ArrayBufferData]] to transferable.[[ArrayBufferData]].
// 3. Set dataHolder.[[ArrayBufferByteLength]] to transferable.[[ArrayBufferByteLength]].
serialize_enum<TransferType>(data_holder.data, TransferType::ArrayBuffer);
MUST(serialize_bytes(vm, data_holder.data, array_buffer.buffer().bytes())); // serializes both byte length and bytes
MUST(serialize_bytes(vm, data_holder.data, array_buffer->buffer().bytes())); // serializes both byte length and bytes
}
// 3. Perform ? DetachArrayBuffer(transferable).
// NOTE: Specifications can use the [[ArrayBufferDetachKey]] internal slot to prevent ArrayBuffers from being detached. This is used in WebAssembly JavaScript Interface, for example. See: https://html.spec.whatwg.org/multipage/references.html#refsWASMJS
TRY(JS::detach_array_buffer(vm, array_buffer));
TRY(JS::detach_array_buffer(vm, *array_buffer));
}
// 5. Otherwise: