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// Copyright 2023 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
namespace collections {
// https://tc39.es/proposal-set-methods/#sec-set.prototype.intersection
transitioning javascript builtin SetPrototypeIntersection(
js-implicit context: NativeContext, receiver: JSAny)(other: JSAny): JSSet {
const methodName: constexpr string = 'Set.prototype.intersection';
const fastIteratorResultMap = GetIteratorResultMap();
// 1. Let O be the this value.
// 2. Perform ? RequireInternalSlot(O, [[SetData]]).
const o = Cast<JSSet>(receiver) otherwise
ThrowTypeError(
MessageTemplate::kIncompatibleMethodReceiver, methodName, receiver);
// 3. Let otherRec be ? GetSetRecord(other).
let otherRec = GetSetRecord(other, methodName);
const table = Cast<OrderedHashSet>(o.table) otherwise unreachable;
// 4. Let resultSetData be a new empty List.
let resultSetData = AllocateOrderedHashSet();
// 5. Let thisSize be the number of elements in O.[[SetData]].
const thisSize =
LoadOrderedHashTableMetadata(table, kOrderedHashSetNumberOfElementsIndex);
try {
typeswitch (other) {
case (otherSet: JSSetWithNoCustomIteration): {
CheckSetRecordHasJSSetMethods(otherRec) otherwise SlowPath;
const otherTable =
Cast<OrderedHashSet>(otherSet.table) otherwise unreachable;
const otherSize = LoadOrderedHashTableMetadata(
otherTable, kOrderedHashSetNumberOfElementsIndex);
if (thisSize <= otherSize) {
resultSetData = FastIntersect<OrderedHashSet>(
table, otherTable, methodName, resultSetData);
goto Done;
} else {
resultSetData = FastIntersect<OrderedHashSet>(
otherTable, table, methodName, resultSetData);
goto Done;
}
}
case (otherMap: JSMapWithNoCustomIteration): {
CheckSetRecordHasJSMapMethods(otherRec) otherwise SlowPath;
const otherTable =
Cast<OrderedHashMap>(otherMap.table) otherwise unreachable;
const otherSize = LoadOrderedHashTableMetadata(
otherTable, kOrderedHashSetNumberOfElementsIndex);
if (thisSize <= otherSize) {
resultSetData = FastIntersect<OrderedHashMap>(
table, otherTable, methodName, resultSetData);
goto Done;
} else {
// TODO(13556): Change `FastIntersect` macro to be able to handle
// this case as well.
let otherIterator =
collections::NewUnmodifiedOrderedHashMapIterator(otherTable);
while (true) {
const nextValue = otherIterator.Next() otherwise Done;
if (TableHasKey(table, nextValue.key)) {
resultSetData =
AddToSetTable(resultSetData, nextValue.key, methodName);
}
}
}
}
case (JSAny): {
goto SlowPath;
}
}
} label SlowPath {
// 6. If thisSize ≤ otherRec.[[Size]], then
if (thisSize <= Convert<int32>(otherRec.size)) {
// a. Let index be 0.
let thisIter = collections::NewOrderedHashSetIterator(table);
// b. Repeat, while index < thisSize,
while (true) {
// i. Let e be O.[[SetData]][index].
const key = thisIter.Next() otherwise Done;
// ii. Set index to index + 1.
// iii. If e is not empty, then
// 1. Let inOther be ToBoolean(? Call(otherRec.[[Has]],
// otherRec.[[Set]], « e »)).
const inOther =
ToBoolean(Call(context, otherRec.has, otherRec.object, key));
// 2. If inOther is true, then
if (inOther) {
// a. NOTE: It is possible for earlier calls to otherRec.[[Has]] to
// remove and re-add an element of O.[[SetData]], which can cause the
// same element to be visited twice during this iteration.
// We used `OrderedHashSetIterator` that works when underlying table
// is changed.
// b. Let alreadyInResult be SetDataHas(resultSetData, e).
// c. If alreadyInResult is false, then
// i. Append e to resultSetData.
resultSetData = AddToSetTable(resultSetData, key, methodName);
}
// 3. NOTE: The number of elements in O.[[SetData]] may have increased
// during execution of otherRec.[[Has]].
// 4. Set thisSize to the number of elements of O.[[SetData]].
// We used iterator so we do not need to update thisSize and index.
}
} else {
// a. Let keysIter be ? GetKeysIterator(otherRec).
let keysIter =
GetKeysIterator(otherRec.object, UnsafeCast<Callable>(otherRec.keys));
// b. Let next be true.
let nextRecord: JSReceiver;
// c. Repeat, while next is not false,
while (true) {
// i. Set next to ? IteratorStep(keysIter).
nextRecord = iterator::IteratorStep(keysIter, fastIteratorResultMap)
otherwise Done;
// ii. If next is not false, then
// 1. Let nextValue be ? IteratorValue(next).
const nextValue =
iterator::IteratorValue(nextRecord, fastIteratorResultMap);
// 2. If nextValue is -0𝔽, set nextValue to +0𝔽.
// 3. NOTE: Because other is an arbitrary object, it is possible for its
// "keys" iterator to produce the same value more than once.
// 4. Let alreadyInResult be SetDataHas(resultSetData, nextValue).
// 5. Let inThis be SetDataHas(O.[[SetData]], nextValue).
if (TableHasKey(table, nextValue)) {
// 6. If alreadyInResult is false and inThis is true, then
// a. Append nextValue to resultSetData.
resultSetData = AddToSetTable(resultSetData, nextValue, methodName);
}
}
}
} label Done {
return new JSSet{
map: *NativeContextSlot(ContextSlot::JS_SET_MAP_INDEX),
properties_or_hash: kEmptyFixedArray,
elements: kEmptyFixedArray,
table: resultSetData
};
}
unreachable;
}
// This macro creates an iterator from a collection that need to be iterated
// (collectionToIterate), lookup each value of the iterator in a table that
// needs to be checked (tableToLookup), and adds the value to the result
// (resultSetData) if it exists in the table.
macro FastIntersect<T : type extends FixedArray>(
implicit context: Context)(collectionToIterate: OrderedHashSet,
tableToLookup: T, methodName: String,
resultSetData: OrderedHashSet): OrderedHashSet {
let result = resultSetData;
let iter =
collections::NewUnmodifiedOrderedHashSetIterator(collectionToIterate);
try {
while (true) {
const nextValue = iter.Next() otherwise Done;
if (TableHasKey(tableToLookup, nextValue)) {
result = AddToSetTable(result, nextValue, methodName);
}
}
} label Done {
return result;
}
unreachable;
}
}
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