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Unified Diff: src/objects.cc

Issue 355793003: Replace HeapNumber as doublebox with an explicit MutableHeapNumber. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Created 6 years, 6 months ago
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Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index aab918e231badf963241cf7e08c564180bdb5e86..94364997c4e4cbbab591a5de3492852d8b8981d1 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -1540,6 +1540,11 @@ void HeapObject::HeapObjectShortPrint(StringStream* accumulator) {
HeapNumber::cast(this)->HeapNumberPrint(accumulator);
accumulator->Put('>');
break;
+ case MUTABLE_HEAP_NUMBER_TYPE:
+ accumulator->Add("<MutableNumber: ");
+ HeapNumber::cast(this)->HeapNumberPrint(accumulator);
+ accumulator->Put('>');
+ break;
case JS_PROXY_TYPE:
accumulator->Add("<JSProxy>");
break;
@@ -1665,6 +1670,7 @@ void HeapObject::IterateBody(InstanceType type, int object_size,
break;
case HEAP_NUMBER_TYPE:
+ case MUTABLE_HEAP_NUMBER_TYPE:
case FILLER_TYPE:
case BYTE_ARRAY_TYPE:
case FREE_SPACE_TYPE:
@@ -1706,7 +1712,7 @@ bool HeapNumber::HeapNumberBooleanValue() {
void HeapNumber::HeapNumberPrint(FILE* out) {
- PrintF(out, "%.16g", Number());
+ PrintF(out, "%.16g", value());
}
@@ -1718,7 +1724,7 @@ void HeapNumber::HeapNumberPrint(StringStream* accumulator) {
// print that using vsnprintf (which may truncate but never allocate if
// there is no more space in the buffer).
EmbeddedVector<char, 100> buffer;
- SNPrintF(buffer, "%.16g", Number());
+ SNPrintF(buffer, "%.16g", value());
accumulator->Add("%s", buffer.start());
}
@@ -2070,8 +2076,8 @@ bool Map::InstancesNeedRewriting(Map* target,
DescriptorArray* new_desc = target->instance_descriptors();
int limit = NumberOfOwnDescriptors();
for (int i = 0; i < limit; i++) {
- if (new_desc->GetDetails(i).representation().IsDouble() &&
- !old_desc->GetDetails(i).representation().IsDouble()) {
+ if (new_desc->GetDetails(i).representation().IsDouble() !=
+ old_desc->GetDetails(i).representation().IsDouble()) {
return true;
}
}
@@ -2168,7 +2174,7 @@ void JSObject::MigrateFastToFast(Handle<JSObject> object, Handle<Map> new_map) {
PropertyDetails details = new_map->GetLastDescriptorDetails();
Handle<Object> value;
if (details.representation().IsDouble()) {
- value = isolate->factory()->NewHeapNumber(0);
+ value = isolate->factory()->NewHeapNumber(0, MUTABLE);
} else {
value = isolate->factory()->uninitialized_value();
}
@@ -2216,6 +2222,9 @@ void JSObject::MigrateFastToFast(Handle<JSObject> object, Handle<Map> new_map) {
value = handle(Smi::FromInt(0), isolate);
}
value = Object::NewStorageFor(isolate, value, details.representation());
+ } else if (old_details.representation().IsDouble() &&
+ !details.representation().IsDouble()) {
+ value = Object::WrapForRead(isolate, value, old_details.representation());
}
ASSERT(!(details.representation().IsDouble() && value->IsSmi()));
int target_index = new_descriptors->GetFieldIndex(i) - inobject;
@@ -2228,7 +2237,7 @@ void JSObject::MigrateFastToFast(Handle<JSObject> object, Handle<Map> new_map) {
if (details.type() != FIELD) continue;
Handle<Object> value;
if (details.representation().IsDouble()) {
- value = isolate->factory()->NewHeapNumber(0);
+ value = isolate->factory()->NewHeapNumber(0, MUTABLE);
} else {
value = isolate->factory()->uninitialized_value();
}
@@ -3975,6 +3984,7 @@ void JSObject::WriteToField(int descriptor, Object* value) {
// Nothing more to be done.
if (value->IsUninitialized()) return;
HeapNumber* box = HeapNumber::cast(RawFastPropertyAt(index));
+ ASSERT(box->IsMutableHeapNumber());
box->set_value(value->Number());
} else {
FastPropertyAtPut(index, value);
@@ -4622,6 +4632,11 @@ void JSObject::MigrateFastToSlow(Handle<JSObject> object,
FieldIndex index = FieldIndex::ForDescriptor(*map, i);
Handle<Object> value(
object->RawFastPropertyAt(index), isolate);
+ if (details.representation().IsDouble()) {
+ ASSERT(value->IsMutableHeapNumber());
+ Handle<HeapNumber> old = Handle<HeapNumber>::cast(value);
+ value = isolate->factory()->NewHeapNumber(old->value());
+ }
PropertyDetails d =
PropertyDetails(details.attributes(), NORMAL, i + 1);
dictionary = NameDictionary::Add(dictionary, key, value, d);
@@ -5794,7 +5809,7 @@ Handle<Object> JSObject::FastPropertyAt(Handle<JSObject> object,
FieldIndex index) {
Isolate* isolate = object->GetIsolate();
Handle<Object> raw_value(object->RawFastPropertyAt(index), isolate);
- return Object::NewStorageFor(isolate, raw_value, representation);
+ return Object::WrapForRead(isolate, raw_value, representation);
}
@@ -6985,7 +7000,7 @@ Object* JSObject::SlowReverseLookup(Object* value) {
Object* property =
RawFastPropertyAt(FieldIndex::ForDescriptor(map(), i));
if (descs->GetDetails(i).representation().IsDouble()) {
- ASSERT(property->IsHeapNumber());
+ ASSERT(property->IsMutableHeapNumber());
if (value->IsNumber() && property->Number() == value->Number()) {
return descs->GetKey(i);
}
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