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Unified Diff: src/objects.cc

Issue 960103003: Revert of Fix memory leak caused by field type in descriptor array. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Created 5 years, 10 months ago
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Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 9eed618367f36f1ae583634f8ce22110022dc933..504474fe3ad283908f7089af6ea939d0d4ab258a 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -1704,12 +1704,6 @@
}
-static Handle<Object> WrapType(Handle<HeapType> type) {
- if (type->IsClass()) return Map::WeakCellForMap(type->AsClass()->Map());
- return type;
-}
-
-
MaybeHandle<Map> Map::CopyWithField(Handle<Map> map,
Handle<Name> name,
Handle<HeapType> type,
@@ -1735,10 +1729,7 @@
type = HeapType::Any(isolate);
}
- Handle<Object> wrapped_type(WrapType(type));
-
- DataDescriptor new_field_desc(name, index, wrapped_type, attributes,
- representation);
+ DataDescriptor new_field_desc(name, index, type, attributes, representation);
Handle<Map> new_map = Map::CopyAddDescriptor(map, &new_field_desc, flag);
int unused_property_fields = new_map->unused_property_fields() - 1;
if (unused_property_fields < 0) {
@@ -2314,16 +2305,15 @@
void Map::UpdateFieldType(int descriptor, Handle<Name> name,
Representation new_representation,
- Handle<Object> new_wrapped_type) {
- DCHECK(new_wrapped_type->IsSmi() || new_wrapped_type->IsWeakCell());
+ Handle<HeapType> new_type) {
DisallowHeapAllocation no_allocation;
PropertyDetails details = instance_descriptors()->GetDetails(descriptor);
if (details.type() != DATA) return;
if (HasTransitionArray()) {
TransitionArray* transitions = this->transitions();
for (int i = 0; i < transitions->number_of_transitions(); ++i) {
- transitions->GetTarget(i)->UpdateFieldType(
- descriptor, name, new_representation, new_wrapped_type);
+ transitions->GetTarget(i)
+ ->UpdateFieldType(descriptor, name, new_representation, new_type);
}
}
// It is allowed to change representation here only from None to something.
@@ -2331,9 +2321,9 @@
details.representation().IsNone());
// Skip if already updated the shared descriptor.
- if (instance_descriptors()->GetValue(descriptor) == *new_wrapped_type) return;
+ if (instance_descriptors()->GetFieldType(descriptor) == *new_type) return;
DataDescriptor d(name, instance_descriptors()->GetFieldIndex(descriptor),
- new_wrapped_type, details.attributes(), new_representation);
+ new_type, details.attributes(), new_representation);
instance_descriptors()->Replace(descriptor, &d);
}
@@ -2381,10 +2371,8 @@
PropertyDetails details = descriptors->GetDetails(modify_index);
Handle<Name> name(descriptors->GetKey(modify_index));
-
- Handle<Object> wrapped_type(WrapType(new_field_type));
field_owner->UpdateFieldType(modify_index, name, new_representation,
- wrapped_type);
+ new_field_type);
field_owner->dependent_code()->DeoptimizeDependentCodeGroup(
isolate, DependentCode::kFieldTypeGroup);
@@ -2776,8 +2764,7 @@
next_field_type =
GeneralizeFieldType(target_field_type, old_field_type, isolate);
}
- Handle<Object> wrapped_type(WrapType(next_field_type));
- DataDescriptor d(target_key, current_offset, wrapped_type,
+ DataDescriptor d(target_key, current_offset, next_field_type,
next_attributes, next_representation);
current_offset += d.GetDetails().field_width_in_words();
new_descriptors->Set(i, &d);
@@ -2845,10 +2832,8 @@
next_field_type = old_field_type;
}
- Handle<Object> wrapped_type(WrapType(next_field_type));
-
- DataDescriptor d(old_key, current_offset, wrapped_type, next_attributes,
- next_representation);
+ DataDescriptor d(old_key, current_offset, next_field_type,
+ next_attributes, next_representation);
current_offset += d.GetDetails().field_width_in_words();
new_descriptors->Set(i, &d);
} else {
@@ -2979,41 +2964,33 @@
if (!old_details.representation().fits_into(new_details.representation())) {
return MaybeHandle<Map>();
}
+ Object* new_value = new_descriptors->GetValue(i);
+ Object* old_value = old_descriptors->GetValue(i);
switch (new_details.type()) {
case DATA: {
- HeapType* new_type = new_descriptors->GetFieldType(i);
- PropertyType old_property_type = old_details.type();
- if (old_property_type == DATA) {
- HeapType* old_type = old_descriptors->GetFieldType(i);
- if (!old_type->NowIs(new_type)) {
+ PropertyType old_type = old_details.type();
+ if (old_type == DATA) {
+ if (!HeapType::cast(old_value)->NowIs(HeapType::cast(new_value))) {
return MaybeHandle<Map>();
}
} else {
- DCHECK(old_property_type == DATA_CONSTANT);
- Object* old_value = old_descriptors->GetValue(i);
- if (!new_type->NowContains(old_value)) {
+ DCHECK(old_type == DATA_CONSTANT);
+ if (!HeapType::cast(new_value)->NowContains(old_value)) {
return MaybeHandle<Map>();
}
}
break;
}
- case ACCESSOR: {
-#ifdef DEBUG
- HeapType* new_type = new_descriptors->GetFieldType(i);
- DCHECK(HeapType::Any()->Is(new_type));
-#endif
+ case ACCESSOR:
+ DCHECK(HeapType::Any()->Is(HeapType::cast(new_value)));
break;
- }
case DATA_CONSTANT:
- case ACCESSOR_CONSTANT: {
- Object* old_value = old_descriptors->GetValue(i);
- Object* new_value = new_descriptors->GetValue(i);
+ case ACCESSOR_CONSTANT:
if (old_details.location() == kField || old_value != new_value) {
return MaybeHandle<Map>();
}
break;
- }
}
}
if (new_map->NumberOfOwnDescriptors() != old_nof) return MaybeHandle<Map>();
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