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deps: cherry-pick 88f8fe1 from upstream V8
Original commit message: Fix collection iterator preview with deleted entries We used to assume that we know the remaining entries returned by the iterator based on the current index. However, that is not accurate, since entries skipped by the current index could be deleted. In the new approach, we allocate conservatively and shrink the result. [email protected] Bug: v8:8433 Change-Id: I38a3004dc3af292daabb454bb76f38d65ef437e8 Reviewed-on: https://chromium-review.googlesource.com/c/1325966 Commit-Queue: Yang Guo <[email protected]> Reviewed-by: Georg Neis <[email protected]> Cr-Commit-Position: refs/heads/master@{#57360} Refs: v8/v8@88f8fe1 PR-URL: #24514 Refs: #24053 Reviewed-By: Michaël Zasso <[email protected]> Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Joyee Cheung <[email protected]>
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-26
lines changed

3 files changed

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‎common.gypi

+1-1
Original file line numberDiff line numberDiff line change
@@ -38,7 +38,7 @@
3838

3939
# Reset this number to 0 on major V8 upgrades.
4040
# Increment by one for each non-official patch applied to deps/v8.
41-
'v8_embedder_string': '-node.4',
41+
'v8_embedder_string': '-node.5',
4242

4343
##### V8 defaults for Node.js #####
4444

‎deps/v8/src/api.cc

+27-25
Original file line numberDiff line numberDiff line change
@@ -7033,30 +7033,30 @@ i::Handle<i::JSArray> MapAsArray(i::Isolate* isolate, i::Object* table_obj,
70337033
i::Factory* factory = isolate->factory();
70347034
i::Handle<i::OrderedHashMap> table(i::OrderedHashMap::cast(table_obj),
70357035
isolate);
7036-
if (offset >= table->NumberOfElements()) return factory->NewJSArray(0);
7037-
int length = (table->NumberOfElements() - offset) *
7038-
(kind == MapAsArrayKind::kEntries ? 2 : 1);
7039-
i::Handle<i::FixedArray> result = factory->NewFixedArray(length);
7036+
const bool collect_keys =
7037+
kind == MapAsArrayKind::kEntries || kind == MapAsArrayKind::kKeys;
7038+
const bool collect_values =
7039+
kind == MapAsArrayKind::kEntries || kind == MapAsArrayKind::kValues;
7040+
int capacity = table->UsedCapacity();
7041+
int max_length =
7042+
(capacity - offset) * ((collect_keys && collect_values) ? 2 : 1);
7043+
i::Handle<i::FixedArray> result = factory->NewFixedArray(max_length);
70407044
int result_index = 0;
70417045
{
70427046
i::DisallowHeapAllocation no_gc;
7043-
int capacity = table->UsedCapacity();
70447047
i::Oddball* the_hole = i::ReadOnlyRoots(isolate).the_hole_value();
7045-
for (int i = 0; i < capacity; ++i) {
7048+
for (int i = offset; i < capacity; ++i) {
70467049
i::Object* key = table->KeyAt(i);
70477050
if (key == the_hole) continue;
7048-
if (offset-- > 0) continue;
7049-
if (kind == MapAsArrayKind::kEntries || kind == MapAsArrayKind::kKeys) {
7050-
result->set(result_index++, key);
7051-
}
7052-
if (kind == MapAsArrayKind::kEntries || kind == MapAsArrayKind::kValues) {
7053-
result->set(result_index++, table->ValueAt(i));
7054-
}
7051+
if (collect_keys) result->set(result_index++, key);
7052+
if (collect_values) result->set(result_index++, table->ValueAt(i));
70557053
}
70567054
}
7057-
DCHECK_EQ(result_index, result->length());
7058-
DCHECK_EQ(result_index, length);
7059-
return factory->NewJSArrayWithElements(result, i::PACKED_ELEMENTS, length);
7055+
DCHECK_GE(max_length, result_index);
7056+
if (result_index == 0) return factory->NewJSArray(0);
7057+
result->Shrink(isolate, result_index);
7058+
return factory->NewJSArrayWithElements(result, i::PACKED_ELEMENTS,
7059+
result_index);
70607060
}
70617061

70627062
} // namespace
@@ -7141,24 +7141,26 @@ i::Handle<i::JSArray> SetAsArray(i::Isolate* isolate, i::Object* table_obj,
71417141
i::Factory* factory = isolate->factory();
71427142
i::Handle<i::OrderedHashSet> table(i::OrderedHashSet::cast(table_obj),
71437143
isolate);
7144-
int length = table->NumberOfElements() - offset;
7145-
if (length <= 0) return factory->NewJSArray(0);
7146-
i::Handle<i::FixedArray> result = factory->NewFixedArray(length);
7144+
// Elements skipped by |offset| may already be deleted.
7145+
int capacity = table->UsedCapacity();
7146+
int max_length = capacity - offset;
7147+
if (max_length == 0) return factory->NewJSArray(0);
7148+
i::Handle<i::FixedArray> result = factory->NewFixedArray(max_length);
71477149
int result_index = 0;
71487150
{
71497151
i::DisallowHeapAllocation no_gc;
7150-
int capacity = table->UsedCapacity();
71517152
i::Oddball* the_hole = i::ReadOnlyRoots(isolate).the_hole_value();
7152-
for (int i = 0; i < capacity; ++i) {
7153+
for (int i = offset; i < capacity; ++i) {
71537154
i::Object* key = table->KeyAt(i);
71547155
if (key == the_hole) continue;
7155-
if (offset-- > 0) continue;
71567156
result->set(result_index++, key);
71577157
}
71587158
}
7159-
DCHECK_EQ(result_index, result->length());
7160-
DCHECK_EQ(result_index, length);
7161-
return factory->NewJSArrayWithElements(result, i::PACKED_ELEMENTS, length);
7159+
DCHECK_GE(max_length, result_index);
7160+
if (result_index == 0) return factory->NewJSArray(0);
7161+
result->Shrink(isolate, result_index);
7162+
return factory->NewJSArrayWithElements(result, i::PACKED_ELEMENTS,
7163+
result_index);
71627164
}
71637165
} // namespace
71647166

‎deps/v8/test/cctest/test-api.cc

+214
Original file line numberDiff line numberDiff line change
@@ -28852,3 +28852,217 @@ TEST(TestGetEmbeddedCodeRange) {
2885228852
CHECK_EQ(0, builtins_range.length_in_bytes);
2885328853
}
2885428854
}
28855+
28856+
TEST(PreviewSetIteratorEntriesWithDeleted) {
28857+
LocalContext env;
28858+
v8::HandleScope handle_scope(env->GetIsolate());
28859+
v8::Local<v8::Context> context = env.local();
28860+
28861+
{
28862+
// Create set, delete entry, create iterator, preview.
28863+
v8::Local<v8::Object> iterator =
28864+
CompileRun("var set = new Set([1,2,3]); set.delete(1); set.keys()")
28865+
->ToObject(context)
28866+
.ToLocalChecked();
28867+
bool is_key;
28868+
v8::Local<v8::Array> entries =
28869+
iterator->PreviewEntries(&is_key).ToLocalChecked();
28870+
CHECK(!is_key);
28871+
CHECK_EQ(2, entries->Length());
28872+
CHECK_EQ(2, entries->Get(context, 0)
28873+
.ToLocalChecked()
28874+
->Int32Value(context)
28875+
.FromJust());
28876+
CHECK_EQ(3, entries->Get(context, 1)
28877+
.ToLocalChecked()
28878+
->Int32Value(context)
28879+
.FromJust());
28880+
}
28881+
{
28882+
// Create set, create iterator, delete entry, preview.
28883+
v8::Local<v8::Object> iterator =
28884+
CompileRun("var set = new Set([1,2,3]); set.keys()")
28885+
->ToObject(context)
28886+
.ToLocalChecked();
28887+
CompileRun("set.delete(1);");
28888+
bool is_key;
28889+
v8::Local<v8::Array> entries =
28890+
iterator->PreviewEntries(&is_key).ToLocalChecked();
28891+
CHECK(!is_key);
28892+
CHECK_EQ(2, entries->Length());
28893+
CHECK_EQ(2, entries->Get(context, 0)
28894+
.ToLocalChecked()
28895+
->Int32Value(context)
28896+
.FromJust());
28897+
CHECK_EQ(3, entries->Get(context, 1)
28898+
.ToLocalChecked()
28899+
->Int32Value(context)
28900+
.FromJust());
28901+
}
28902+
{
28903+
// Create set, create iterator, delete entry, iterate, preview.
28904+
v8::Local<v8::Object> iterator =
28905+
CompileRun("var set = new Set([1,2,3]); var it = set.keys(); it")
28906+
->ToObject(context)
28907+
.ToLocalChecked();
28908+
CompileRun("set.delete(1); it.next();");
28909+
bool is_key;
28910+
v8::Local<v8::Array> entries =
28911+
iterator->PreviewEntries(&is_key).ToLocalChecked();
28912+
CHECK(!is_key);
28913+
CHECK_EQ(1, entries->Length());
28914+
CHECK_EQ(3, entries->Get(context, 0)
28915+
.ToLocalChecked()
28916+
->Int32Value(context)
28917+
.FromJust());
28918+
}
28919+
{
28920+
// Create set, create iterator, delete entry, iterate until empty, preview.
28921+
v8::Local<v8::Object> iterator =
28922+
CompileRun("var set = new Set([1,2,3]); var it = set.keys(); it")
28923+
->ToObject(context)
28924+
.ToLocalChecked();
28925+
CompileRun("set.delete(1); it.next(); it.next();");
28926+
bool is_key;
28927+
v8::Local<v8::Array> entries =
28928+
iterator->PreviewEntries(&is_key).ToLocalChecked();
28929+
CHECK(!is_key);
28930+
CHECK_EQ(0, entries->Length());
28931+
}
28932+
{
28933+
// Create set, create iterator, delete entry, iterate, trigger rehash,
28934+
// preview.
28935+
v8::Local<v8::Object> iterator =
28936+
CompileRun("var set = new Set([1,2,3]); var it = set.keys(); it")
28937+
->ToObject(context)
28938+
.ToLocalChecked();
28939+
CompileRun("set.delete(1); it.next();");
28940+
CompileRun("for (var i = 4; i < 20; i++) set.add(i);");
28941+
bool is_key;
28942+
v8::Local<v8::Array> entries =
28943+
iterator->PreviewEntries(&is_key).ToLocalChecked();
28944+
CHECK(!is_key);
28945+
CHECK_EQ(17, entries->Length());
28946+
for (uint32_t i = 0; i < 17; i++) {
28947+
CHECK_EQ(i + 3, entries->Get(context, i)
28948+
.ToLocalChecked()
28949+
->Int32Value(context)
28950+
.FromJust());
28951+
}
28952+
}
28953+
}
28954+
28955+
TEST(PreviewMapIteratorEntriesWithDeleted) {
28956+
LocalContext env;
28957+
v8::HandleScope handle_scope(env->GetIsolate());
28958+
v8::Local<v8::Context> context = env.local();
28959+
28960+
{
28961+
// Create map, delete entry, create iterator, preview.
28962+
v8::Local<v8::Object> iterator = CompileRun(
28963+
"var map = new Map();"
28964+
"var key = {}; map.set(key, 1);"
28965+
"map.set({}, 2); map.set({}, 3);"
28966+
"map.delete(key);"
28967+
"map.values()")
28968+
->ToObject(context)
28969+
.ToLocalChecked();
28970+
bool is_key;
28971+
v8::Local<v8::Array> entries =
28972+
iterator->PreviewEntries(&is_key).ToLocalChecked();
28973+
CHECK(!is_key);
28974+
CHECK_EQ(2, entries->Length());
28975+
CHECK_EQ(2, entries->Get(context, 0)
28976+
.ToLocalChecked()
28977+
->Int32Value(context)
28978+
.FromJust());
28979+
CHECK_EQ(3, entries->Get(context, 1)
28980+
.ToLocalChecked()
28981+
->Int32Value(context)
28982+
.FromJust());
28983+
}
28984+
{
28985+
// Create map, create iterator, delete entry, preview.
28986+
v8::Local<v8::Object> iterator = CompileRun(
28987+
"var map = new Map();"
28988+
"var key = {}; map.set(key, 1);"
28989+
"map.set({}, 2); map.set({}, 3);"
28990+
"map.values()")
28991+
->ToObject(context)
28992+
.ToLocalChecked();
28993+
CompileRun("map.delete(key);");
28994+
bool is_key;
28995+
v8::Local<v8::Array> entries =
28996+
iterator->PreviewEntries(&is_key).ToLocalChecked();
28997+
CHECK(!is_key);
28998+
CHECK_EQ(2, entries->Length());
28999+
CHECK_EQ(2, entries->Get(context, 0)
29000+
.ToLocalChecked()
29001+
->Int32Value(context)
29002+
.FromJust());
29003+
CHECK_EQ(3, entries->Get(context, 1)
29004+
.ToLocalChecked()
29005+
->Int32Value(context)
29006+
.FromJust());
29007+
}
29008+
{
29009+
// Create map, create iterator, delete entry, iterate, preview.
29010+
v8::Local<v8::Object> iterator = CompileRun(
29011+
"var map = new Map();"
29012+
"var key = {}; map.set(key, 1);"
29013+
"map.set({}, 2); map.set({}, 3);"
29014+
"var it = map.values(); it")
29015+
->ToObject(context)
29016+
.ToLocalChecked();
29017+
CompileRun("map.delete(key); it.next();");
29018+
bool is_key;
29019+
v8::Local<v8::Array> entries =
29020+
iterator->PreviewEntries(&is_key).ToLocalChecked();
29021+
CHECK(!is_key);
29022+
CHECK_EQ(1, entries->Length());
29023+
CHECK_EQ(3, entries->Get(context, 0)
29024+
.ToLocalChecked()
29025+
->Int32Value(context)
29026+
.FromJust());
29027+
}
29028+
{
29029+
// Create map, create iterator, delete entry, iterate until empty, preview.
29030+
v8::Local<v8::Object> iterator = CompileRun(
29031+
"var map = new Map();"
29032+
"var key = {}; map.set(key, 1);"
29033+
"map.set({}, 2); map.set({}, 3);"
29034+
"var it = map.values(); it")
29035+
->ToObject(context)
29036+
.ToLocalChecked();
29037+
CompileRun("map.delete(key); it.next(); it.next();");
29038+
bool is_key;
29039+
v8::Local<v8::Array> entries =
29040+
iterator->PreviewEntries(&is_key).ToLocalChecked();
29041+
CHECK(!is_key);
29042+
CHECK_EQ(0, entries->Length());
29043+
}
29044+
{
29045+
// Create map, create iterator, delete entry, iterate, trigger rehash,
29046+
// preview.
29047+
v8::Local<v8::Object> iterator = CompileRun(
29048+
"var map = new Map();"
29049+
"var key = {}; map.set(key, 1);"
29050+
"map.set({}, 2); map.set({}, 3);"
29051+
"var it = map.values(); it")
29052+
->ToObject(context)
29053+
.ToLocalChecked();
29054+
CompileRun("map.delete(key); it.next();");
29055+
CompileRun("for (var i = 4; i < 20; i++) map.set({}, i);");
29056+
bool is_key;
29057+
v8::Local<v8::Array> entries =
29058+
iterator->PreviewEntries(&is_key).ToLocalChecked();
29059+
CHECK(!is_key);
29060+
CHECK_EQ(17, entries->Length());
29061+
for (uint32_t i = 0; i < 17; i++) {
29062+
CHECK_EQ(i + 3, entries->Get(context, i)
29063+
.ToLocalChecked()
29064+
->Int32Value(context)
29065+
.FromJust());
29066+
}
29067+
}
29068+
}

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