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Populate receiver types when there is no type feedback

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When there is no type feedback yet, ComputeReceiverTypes
should still populate the SmallMapList when the receiver
is a HConstant.

BUG=
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/230363003

Patch from Petka Antonov <p.antonov@partner.samsung.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20646 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
verwaest@chromium.org 2014-04-10 09:49:53 +00:00
parent 5bddec047d
commit 453d6fc285
1 changed files with 28 additions and 12 deletions
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36
src/hydrogen.cc
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@ -4996,13 +4996,15 @@ void HOptimizedGraphBuilder::VisitRegExpLiteral(RegExpLiteral* expr) {
}
static bool CanInlinePropertyAccess(Type* type) {
static bool CanInlinePropertyAccess(Type* type, PropertyAccessType access) {
if (type->Is(Type::NumberOrString())) return true;
if (!type->IsClass()) return false;
Handle<Map> map = type->AsClass();
return map->IsJSObjectMap() &&
!map->is_dictionary_map() &&
!map->has_named_interceptor();
!map->has_named_interceptor() &&
// Must be a LOAD or a non-observed STORE
(access == LOAD || !map->is_observed());
}
@ -5414,7 +5416,7 @@ HInstruction* HOptimizedGraphBuilder::BuildStoreNamedField(
bool HOptimizedGraphBuilder::PropertyAccessInfo::IsCompatible(
PropertyAccessInfo* info) {
if (!CanInlinePropertyAccess(type_)) return false;
if (!CanInlinePropertyAccess(type_, access_type_)) return false;
// Currently only handle Type::Number as a polymorphic case.
// TODO(verwaest): Support monomorphic handling of numbers with a HCheckNumber
@ -5515,7 +5517,7 @@ bool HOptimizedGraphBuilder::PropertyAccessInfo::LookupInPrototypes() {
JSObject::TryMigrateInstance(holder_);
}
map = Handle<Map>(holder_->map());
if (!CanInlinePropertyAccess(ToType(map))) {
if (!CanInlinePropertyAccess(ToType(map), access_type_)) {
lookup_.NotFound();
return false;
}
@ -5528,7 +5530,7 @@ bool HOptimizedGraphBuilder::PropertyAccessInfo::LookupInPrototypes() {
bool HOptimizedGraphBuilder::PropertyAccessInfo::CanAccessMonomorphic() {
if (!CanInlinePropertyAccess(type_)) return false;
if (!CanInlinePropertyAccess(type_, access_type_)) return false;
if (IsJSObjectFieldAccessor()) return IsLoad();
if (!LookupDescriptor()) return false;
if (lookup_.IsFound()) {
@ -5807,17 +5809,27 @@ void HOptimizedGraphBuilder::HandlePolymorphicNamedFieldAccess(
static bool ComputeReceiverTypes(Expression* expr,
HValue* receiver,
SmallMapList** t,
PropertyAccessType access_type,
Zone* zone) {
SmallMapList* types = expr->GetReceiverTypes();
*t = types;
bool monomorphic = expr->IsMonomorphic();
if (types != NULL && receiver->HasMonomorphicJSObjectType()) {
Isolate* isolate = zone->isolate();
if (types != NULL) {
if (receiver->HasMonomorphicJSObjectType()) {
Map* root_map = receiver->GetMonomorphicJSObjectMap()->FindRootMap();
types->FilterForPossibleTransitions(root_map);
} else if (types->is_empty() &&
receiver->IsConstant() &&
HConstant::cast(receiver)->handle(isolate)->IsJSObject()) {
Handle<Map> map(Handle<JSObject>::cast(
HConstant::cast(receiver)->handle(isolate))->map());
types->Add(map, zone);
}
monomorphic = types->length() == 1;
}
return monomorphic && CanInlinePropertyAccess(
IC::MapToType<Type>(types->first(), zone));
IC::MapToType<Type>(types->first(), zone), access_type);
}
@ -6520,7 +6532,11 @@ HValue* HOptimizedGraphBuilder::HandleKeyedElementAccess(
HInstruction* instr = NULL;
SmallMapList* types;
bool monomorphic = ComputeReceiverTypes(expr, obj, &types, zone());
bool monomorphic = ComputeReceiverTypes(expr,
obj,
&types,
access_type,
zone());
bool force_generic = false;
if (access_type == STORE &&
@ -6659,7 +6675,7 @@ HInstruction* HOptimizedGraphBuilder::BuildNamedAccess(
HValue* value,
bool is_uninitialized) {
SmallMapList* types;
ComputeReceiverTypes(expr, object, &types, zone());
ComputeReceiverTypes(expr, object, &types, access, zone());
ASSERT(types != NULL);
if (types->length() > 0) {
@ -7975,7 +7991,7 @@ void HOptimizedGraphBuilder::VisitCall(Call* expr) {
HValue* receiver = Top();
SmallMapList* types;
ComputeReceiverTypes(expr, receiver, &types, zone());
ComputeReceiverTypes(expr, receiver, &types, LOAD, zone());
if (prop->key()->IsPropertyName() && types->length() > 0) {
Handle<String> name = prop->key()->AsLiteral()->AsPropertyName();