}
-inline Code* IC::get_host() {
+inline Code* CallIC::get_host() {
return isolate()
->inner_pointer_to_code_cache()
->GetCacheEntry(address())
->code;
}
+
+
+// static
+IC::State CallIC::FeedbackToState(Isolate* isolate, TypeFeedbackVector* vector,
+ FeedbackVectorICSlot slot) {
+ IC::State state = UNINITIALIZED;
+ Object* feedback = vector->Get(slot);
+
+ if (feedback == *TypeFeedbackVector::MegamorphicSentinel(isolate)) {
+ state = GENERIC;
+ } else if (feedback->IsAllocationSite() || feedback->IsJSFunction()) {
+ state = MONOMORPHIC;
+ } else {
+ CHECK(feedback == *TypeFeedbackVector::UninitializedSentinel(isolate));
+ }
+
+ return state;
+}
}
} // namespace v8::internal
// static
-template <class Nexus>
void ICUtility::Clear(Isolate* isolate, Code::Kind kind, Code* host,
- Nexus* nexus) {
- IC::Clear<Nexus>(isolate, kind, host, nexus);
+ TypeFeedbackVector* vector, FeedbackVectorICSlot slot) {
+ IC::Clear(isolate, kind, host, vector, slot);
}
-// Force instantiation of template instances for vector-based IC clearing.
-template void ICUtility::Clear<CallICNexus>(Isolate*, Code::Kind, Code*,
- CallICNexus*);
-
-
CallICState::CallICState(ExtraICState extra_ic_state)
: argc_(ArgcBits::decode(extra_ic_state)),
call_type_(CallTypeBits::decode(extra_ic_state)) {}
static void Clear(Isolate* isolate, Address address,
ConstantPoolArray* constant_pool);
// Clear a vector-based inline cache to initial state.
- template <class Nexus>
static void Clear(Isolate* isolate, Code::Kind kind, Code* host,
- Nexus* nexus);
+ TypeFeedbackVector* vector, FeedbackVectorICSlot slot);
};
void IC::TraceIC(const char* type, Handle<Object> name) {
if (FLAG_trace_ic) {
- State new_state =
- UseVector() ? nexus()->StateFromFeedback() : raw_target()->ic_state();
+ Code* new_target = raw_target();
+ State new_state = new_target->ic_state();
TraceIC(type, name, state(), new_state);
}
}
}
}
-
#define TRACE_IC(type, name) TraceIC(type, name)
+#define TRACE_VECTOR_IC(type, name, old_state, new_state) \
+ TraceIC(type, name, old_state, new_state)
-
-IC::IC(FrameDepth depth, Isolate* isolate, FeedbackNexus* nexus,
- bool for_queries_only)
- : isolate_(isolate),
- target_set_(false),
- target_maps_set_(false),
- nexus_(nexus) {
+IC::IC(FrameDepth depth, Isolate* isolate)
+ : isolate_(isolate), target_set_(false), target_maps_set_(false) {
// To improve the performance of the (much used) IC code, we unfold a few
// levels of the stack frame iteration code. This yields a ~35% speedup when
// running DeltaBlue and a ~25% speedup of gbemu with the '--nouse-ic' flag.
}
pc_address_ = StackFrame::ResolveReturnAddressLocation(pc_address);
target_ = handle(raw_target(), isolate);
+ state_ = target_->ic_state();
kind_ = target_->kind();
- state_ = (!for_queries_only && UseVector()) ? nexus->StateFromFeedback()
- : target_->ic_state();
- old_state_ = state_;
extra_ic_state_ = target_->extra_ic_state();
}
}
-// static
-void IC::OnTypeFeedbackChanged(Isolate* isolate, Code* host,
- TypeFeedbackVector* vector, State old_state,
- State new_state) {
- if (host->kind() != Code::FUNCTION) return;
-
- if (FLAG_type_info_threshold > 0) {
- int polymorphic_delta = 0; // "Polymorphic" here includes monomorphic.
- int generic_delta = 0; // "Generic" here includes megamorphic.
- ComputeTypeInfoCountDelta(old_state, new_state, &polymorphic_delta,
- &generic_delta);
- vector->change_ic_with_type_info_count(polymorphic_delta);
- vector->change_ic_generic_count(generic_delta);
- }
- TypeFeedbackInfo* info = TypeFeedbackInfo::cast(host->type_feedback_info());
- info->change_own_type_change_checksum();
- host->set_profiler_ticks(0);
- isolate->runtime_profiler()->NotifyICChanged();
- // TODO(2029): When an optimized function is patched, it would
- // be nice to propagate the corresponding type information to its
- // unoptimized version for the benefit of later inlining.
-}
-
-
void IC::PostPatching(Address address, Code* target, Code* old_target) {
// Type vector based ICs update these statistics at a different time because
// they don't always patch on state change.
}
-template <class Nexus>
-void IC::Clear(Isolate* isolate, Code::Kind kind, Code* host, Nexus* nexus) {
+void IC::Clear(Isolate* isolate, Code::Kind kind, Code* host,
+ TypeFeedbackVector* vector, FeedbackVectorICSlot slot) {
switch (kind) {
case Code::CALL_IC:
- return CallIC::Clear(isolate, host, nexus);
+ return CallIC::Clear(isolate, host, vector, slot);
default:
UNREACHABLE();
}
}
-// Force instantiation of template instances for vector-based IC clearing.
-template void IC::Clear(Isolate*, Code::Kind, Code*, CallICNexus*);
-
-
void KeyedLoadIC::Clear(Isolate* isolate, Address address, Code* target,
ConstantPoolArray* constant_pool) {
if (IsCleared(target)) return;
}
-void CallIC::Clear(Isolate* isolate, Code* host, CallICNexus* nexus) {
+void CallIC::Clear(Isolate* isolate, Code* host, TypeFeedbackVector* vector,
+ FeedbackVectorICSlot slot) {
+ DCHECK(vector != NULL && !slot.IsInvalid());
+ Object* feedback = vector->Get(slot);
// Determine our state.
- Object* feedback = nexus->vector()->Get(nexus->slot());
- State state = nexus->StateFromFeedback();
+ State state = FeedbackToState(isolate, vector, slot);
if (state != UNINITIALIZED && !feedback->IsAllocationSite()) {
- nexus->ConfigureUninitialized();
+ vector->Set(slot, isolate->heap()->uninitialized_symbol(),
+ SKIP_WRITE_BARRIER);
// The change in state must be processed.
- OnTypeFeedbackChanged(isolate, host, nexus->vector(), state, UNINITIALIZED);
+ OnTypeFeedbackChanged(isolate, host, vector, state, UNINITIALIZED);
}
}
}
+// static
+void CallIC::OnTypeFeedbackChanged(Isolate* isolate, Code* host,
+ TypeFeedbackVector* vector, State old_state,
+ State new_state) {
+ if (host->kind() != Code::FUNCTION) return;
+
+ if (FLAG_type_info_threshold > 0) {
+ int polymorphic_delta = 0; // "Polymorphic" here includes monomorphic.
+ int generic_delta = 0; // "Generic" here includes megamorphic.
+ ComputeTypeInfoCountDelta(old_state, new_state, &polymorphic_delta,
+ &generic_delta);
+ vector->change_ic_with_type_info_count(polymorphic_delta);
+ vector->change_ic_generic_count(generic_delta);
+ }
+ TypeFeedbackInfo* info = TypeFeedbackInfo::cast(host->type_feedback_info());
+ info->change_own_type_change_checksum();
+ host->set_profiler_ticks(0);
+ isolate->runtime_profiler()->NotifyICChanged();
+ // TODO(2029): When an optimized function is patched, it would
+ // be nice to propagate the corresponding type information to its
+ // unoptimized version for the benefit of later inlining.
+}
+
+
bool CallIC::DoCustomHandler(Handle<Object> receiver, Handle<Object> function,
- const CallICState& callic_state) {
+ Handle<TypeFeedbackVector> vector,
+ FeedbackVectorICSlot slot,
+ const CallICState& state) {
DCHECK(FLAG_use_ic && function->IsJSFunction());
// Are we the array function?
Handle<JSFunction>(isolate()->native_context()->array_function());
if (array_function.is_identical_to(Handle<JSFunction>::cast(function))) {
// Alter the slot.
- CallICNexus* nexus = casted_nexus<CallICNexus>();
- nexus->ConfigureMonomorphicArray();
+ IC::State old_state = FeedbackToState(isolate(), *vector, slot);
+ Object* feedback = vector->Get(slot);
+ if (!feedback->IsAllocationSite()) {
+ Handle<AllocationSite> new_site =
+ isolate()->factory()->NewAllocationSite();
+ vector->Set(slot, *new_site);
+ }
- CallIC_ArrayStub stub(isolate(), callic_state);
+ CallIC_ArrayStub stub(isolate(), state);
set_target(*stub.GetCode());
Handle<String> name;
if (array_function->shared()->name()->IsString()) {
name = Handle<String>(String::cast(array_function->shared()->name()),
isolate());
}
- TRACE_IC("CallIC", name);
- OnTypeFeedbackChanged(isolate(), get_host(), nexus->vector(), state(),
- MONOMORPHIC);
+
+ IC::State new_state = FeedbackToState(isolate(), *vector, slot);
+ OnTypeFeedbackChanged(isolate(), get_host(), *vector, old_state, new_state);
+ TRACE_VECTOR_IC("CallIC (custom handler)", name, old_state, new_state);
return true;
}
return false;
}
-void CallIC::PatchMegamorphic(Handle<Object> function) {
- CallICState callic_state(target()->extra_ic_state());
+void CallIC::PatchMegamorphic(Handle<Object> function,
+ Handle<TypeFeedbackVector> vector,
+ FeedbackVectorICSlot slot) {
+ CallICState state(target()->extra_ic_state());
+ IC::State old_state = FeedbackToState(isolate(), *vector, slot);
// We are going generic.
- CallICNexus* nexus = casted_nexus<CallICNexus>();
- nexus->ConfigureGeneric();
+ vector->Set(slot, *TypeFeedbackVector::MegamorphicSentinel(isolate()),
+ SKIP_WRITE_BARRIER);
- CallICStub stub(isolate(), callic_state);
+ CallICStub stub(isolate(), state);
Handle<Code> code = stub.GetCode();
set_target(*code);
name = handle(js_function->shared()->name(), isolate());
}
- TRACE_IC("CallIC", name);
- OnTypeFeedbackChanged(isolate(), get_host(), nexus->vector(), state(),
- GENERIC);
+ IC::State new_state = FeedbackToState(isolate(), *vector, slot);
+ OnTypeFeedbackChanged(isolate(), get_host(), *vector, old_state, new_state);
+ TRACE_VECTOR_IC("CallIC", name, old_state, new_state);
}
-void CallIC::HandleMiss(Handle<Object> receiver, Handle<Object> function) {
- CallICState callic_state(target()->extra_ic_state());
+void CallIC::HandleMiss(Handle<Object> receiver, Handle<Object> function,
+ Handle<TypeFeedbackVector> vector,
+ FeedbackVectorICSlot slot) {
+ CallICState state(target()->extra_ic_state());
+ IC::State old_state = FeedbackToState(isolate(), *vector, slot);
Handle<Object> name = isolate()->factory()->empty_string();
- CallICNexus* nexus = casted_nexus<CallICNexus>();
- Object* feedback = nexus->GetFeedback();
+ Object* feedback = vector->Get(slot);
// Hand-coded MISS handling is easier if CallIC slots don't contain smis.
DCHECK(!feedback->IsSmi());
if (feedback->IsJSFunction() || !function->IsJSFunction()) {
// We are going generic.
- nexus->ConfigureGeneric();
+ vector->Set(slot, *TypeFeedbackVector::MegamorphicSentinel(isolate()),
+ SKIP_WRITE_BARRIER);
} else {
// The feedback is either uninitialized or an allocation site.
// It might be an allocation site because if we re-compile the full code
feedback->IsAllocationSite());
// Do we want to install a custom handler?
- if (FLAG_use_ic && DoCustomHandler(receiver, function, callic_state)) {
+ if (FLAG_use_ic &&
+ DoCustomHandler(receiver, function, vector, slot, state)) {
return;
}
- nexus->ConfigureMonomorphic(Handle<JSFunction>::cast(function));
+ vector->Set(slot, *function);
}
if (function->IsJSFunction()) {
name = handle(js_function->shared()->name(), isolate());
}
- IC::State new_state = nexus->StateFromFeedback();
- OnTypeFeedbackChanged(isolate(), get_host(), *vector(), state(), new_state);
- TRACE_IC("CallIC", name);
+ IC::State new_state = FeedbackToState(isolate(), *vector, slot);
+ OnTypeFeedbackChanged(isolate(), get_host(), *vector, old_state, new_state);
+ TRACE_VECTOR_IC("CallIC", name, old_state, new_state);
}
TimerEventScope<TimerEventIcMiss> timer(isolate);
HandleScope scope(isolate);
DCHECK(args.length() == 4);
+ CallIC ic(isolate);
Handle<Object> receiver = args.at<Object>(0);
Handle<Object> function = args.at<Object>(1);
Handle<TypeFeedbackVector> vector = args.at<TypeFeedbackVector>(2);
Handle<Smi> slot = args.at<Smi>(3);
FeedbackVectorICSlot vector_slot = vector->ToICSlot(slot->value());
- CallICNexus nexus(vector, vector_slot);
- CallIC ic(isolate, &nexus);
- ic.HandleMiss(receiver, function);
+ ic.HandleMiss(receiver, function, vector, vector_slot);
return *function;
}
TimerEventScope<TimerEventIcMiss> timer(isolate);
HandleScope scope(isolate);
DCHECK(args.length() == 4);
+ // A miss on a custom call ic always results in going megamorphic.
+ CallIC ic(isolate);
Handle<Object> function = args.at<Object>(1);
Handle<TypeFeedbackVector> vector = args.at<TypeFeedbackVector>(2);
Handle<Smi> slot = args.at<Smi>(3);
FeedbackVectorICSlot vector_slot = vector->ToICSlot(slot->value());
- CallICNexus nexus(vector, vector_slot);
- // A miss on a custom call ic always results in going megamorphic.
- CallIC ic(isolate, &nexus);
- ic.PatchMegamorphic(function);
+ ic.PatchMegamorphic(function, vector, vector_slot);
return *function;
}
// Construct the IC structure with the given number of extra
// JavaScript frames on the stack.
- IC(FrameDepth depth, Isolate* isolate, FeedbackNexus* nexus = NULL,
- bool for_queries_only = false);
+ IC(FrameDepth depth, Isolate* isolate);
virtual ~IC() {}
State state() const { return state_; }
bool IsNameCompatibleWithPrototypeFailure(Handle<Object> name);
void MarkPrototypeFailure(Handle<Object> name) {
DCHECK(IsNameCompatibleWithPrototypeFailure(name));
- old_state_ = state_;
state_ = PROTOTYPE_FAILURE;
}
ConstantPoolArray* constant_pool);
// Clear the vector-based inline cache to initial state.
- template <class Nexus>
static void Clear(Isolate* isolate, Code::Kind kind, Code* host,
- Nexus* nexus);
+ TypeFeedbackVector* vector, FeedbackVectorICSlot slot);
#ifdef DEBUG
bool IsLoadStub() const {
return state == UNINITIALIZED || state == PREMONOMORPHIC;
}
- static bool IsCleared(FeedbackNexus* nexus) {
- InlineCacheState state = nexus->StateFromFeedback();
- return state == UNINITIALIZED || state == PREMONOMORPHIC;
- }
-
// Utility functions to convert maps to types and back. There are two special
// cases:
// - The heap_number_map is used as a marker which includes heap numbers as
inline void set_target(Code* code);
bool is_target_set() { return target_set_; }
- bool UseVector() const {
- bool use = (FLAG_vector_ics &&
- (kind() == Code::LOAD_IC || kind() == Code::KEYED_LOAD_IC)) ||
- kind() == Code::CALL_IC;
- // If we are supposed to use the nexus, verify the nexus is non-null.
- DCHECK(!use || nexus_ != NULL);
- return use;
- }
-
char TransitionMarkFromState(IC::State state);
void TraceIC(const char* type, Handle<Object> name);
void TraceIC(const char* type, Handle<Object> name, State old_state,
static void OnTypeFeedbackChanged(Isolate* isolate, Address address,
State old_state, State new_state,
bool target_remains_ic_stub);
- // As a vector-based IC, type feedback must be updated differently.
- static void OnTypeFeedbackChanged(Isolate* isolate, Code* host,
- TypeFeedbackVector* vector, State old_state,
- State new_state);
static void PostPatching(Address address, Code* target, Code* old_target);
// Compute the handler either by compiling or by retrieving a cached version.
inline void UpdateTarget();
- Handle<TypeFeedbackVector> vector() const { return nexus()->vector_handle(); }
- FeedbackVectorICSlot slot() const { return nexus()->slot(); }
- State saved_state() const {
- return state() == PROTOTYPE_FAILURE ? old_state_ : state();
- }
-
- template <class NexusClass>
- NexusClass* casted_nexus() {
- return static_cast<NexusClass*>(nexus_);
- }
- FeedbackNexus* nexus() const { return nexus_; }
-
- inline Code* get_host();
-
private:
inline Code* raw_target() const;
inline ConstantPoolArray* constant_pool() const;
// The original code target that missed.
Handle<Code> target_;
bool target_set_;
- State old_state_; // For saving if we marked as prototype failure.
State state_;
Code::Kind kind_;
Handle<HeapType> receiver_type_;
MapHandleList target_maps_;
bool target_maps_set_;
- FeedbackNexus* nexus_;
-
DISALLOW_IMPLICIT_CONSTRUCTORS(IC);
};
class CallIC : public IC {
public:
- CallIC(Isolate* isolate, CallICNexus* nexus)
- : IC(EXTRA_CALL_FRAME, isolate, nexus) {
- DCHECK(nexus != NULL);
- }
+ explicit CallIC(Isolate* isolate) : IC(EXTRA_CALL_FRAME, isolate) {}
- void PatchMegamorphic(Handle<Object> function);
+ void PatchMegamorphic(Handle<Object> function,
+ Handle<TypeFeedbackVector> vector,
+ FeedbackVectorICSlot slot);
- void HandleMiss(Handle<Object> receiver, Handle<Object> function);
+ void HandleMiss(Handle<Object> receiver, Handle<Object> function,
+ Handle<TypeFeedbackVector> vector, FeedbackVectorICSlot slot);
// Returns true if a custom handler was installed.
bool DoCustomHandler(Handle<Object> receiver, Handle<Object> function,
- const CallICState& callic_state);
+ Handle<TypeFeedbackVector> vector,
+ FeedbackVectorICSlot slot, const CallICState& state);
// Code generator routines.
static Handle<Code> initialize_stub(Isolate* isolate, int argc,
CallICState::CallType call_type);
- static void Clear(Isolate* isolate, Code* host, CallICNexus* nexus);
+ static void Clear(Isolate* isolate, Code* host, TypeFeedbackVector* vector,
+ FeedbackVectorICSlot slot);
+
+ private:
+ static inline IC::State FeedbackToState(Isolate* isolate,
+ TypeFeedbackVector* vector,
+ FeedbackVectorICSlot slot);
+
+ inline Code* get_host();
+
+ // As a vector-based IC, type feedback must be updated differently.
+ static void OnTypeFeedbackChanged(Isolate* isolate, Code* host,
+ TypeFeedbackVector* vector, State old_state,
+ State new_state);
};
#include "src/v8.h"
-#include "src/ic/ic.h"
#include "src/ic/ic-state.h"
#include "src/objects.h"
#include "src/type-feedback-vector-inl.h"
FeedbackVectorICSlot slot(i);
Object* obj = Get(slot);
if (obj != uninitialized_sentinel) {
- // TODO(mvstanton): To make this code work with --vector-ics,
- // additional Nexus types must be created.
- DCHECK(!FLAG_vector_ics);
- DCHECK(GetKind(slot) == Code::CALL_IC);
- CallICNexus nexus(this, slot);
- ICUtility::Clear(isolate, Code::CALL_IC, host, &nexus);
+ ICUtility::Clear(isolate, Code::CALL_IC, host, this, slot);
}
}
}
-
-
-Handle<FixedArray> FeedbackNexus::EnsureArrayOfSize(int length) {
- Isolate* isolate = GetIsolate();
- Handle<Object> feedback = handle(GetFeedback(), isolate);
- if (!feedback->IsFixedArray() ||
- FixedArray::cast(*feedback)->length() != length) {
- Handle<FixedArray> array = isolate->factory()->NewFixedArray(length);
- SetFeedback(*array);
- return array;
- }
- return Handle<FixedArray>::cast(feedback);
-}
-
-
-void FeedbackNexus::InstallHandlers(int start_index, TypeHandleList* types,
- CodeHandleList* handlers) {
- Isolate* isolate = GetIsolate();
- FixedArray* array = FixedArray::cast(GetFeedback());
- int receiver_count = types->length();
- for (int current = 0; current < receiver_count; ++current) {
- Handle<HeapType> type = types->at(current);
- Handle<Map> map = IC::TypeToMap(*type, isolate);
- array->set(start_index + (current * 2), *map);
- array->set(start_index + (current * 2 + 1), *handlers->at(current));
- }
-}
-
-
-InlineCacheState CallICNexus::StateFromFeedback() const {
- Isolate* isolate = GetIsolate();
- InlineCacheState state = UNINITIALIZED;
- Object* feedback = GetFeedback();
-
- if (feedback == *vector()->MegamorphicSentinel(isolate)) {
- state = GENERIC;
- } else if (feedback->IsAllocationSite() || feedback->IsJSFunction()) {
- state = MONOMORPHIC;
- } else {
- CHECK(feedback == *vector()->UninitializedSentinel(isolate));
- }
-
- return state;
-}
-
-
-void CallICNexus::ConfigureGeneric() {
- SetFeedback(*vector()->MegamorphicSentinel(GetIsolate()), SKIP_WRITE_BARRIER);
-}
-
-
-void CallICNexus::ConfigureMonomorphicArray() {
- Object* feedback = GetFeedback();
- if (!feedback->IsAllocationSite()) {
- Handle<AllocationSite> new_site =
- GetIsolate()->factory()->NewAllocationSite();
- SetFeedback(*new_site);
- }
-}
-
-
-void CallICNexus::ConfigureUninitialized() {
- SetFeedback(*vector()->UninitializedSentinel(GetIsolate()),
- SKIP_WRITE_BARRIER);
-}
-
-
-void CallICNexus::ConfigureMonomorphic(Handle<JSFunction> function) {
- SetFeedback(*function);
-}
-
-
-int FeedbackNexus::ExtractMaps(int start_index, MapHandleList* maps) const {
- Isolate* isolate = GetIsolate();
- Object* feedback = GetFeedback();
- if (feedback->IsFixedArray()) {
- FixedArray* array = FixedArray::cast(feedback);
- // The array should be of the form [<optional name>], then
- // [map, handler, map, handler, ... ]
- DCHECK(array->length() >= (2 + start_index));
- for (int i = start_index; i < array->length(); i += 2) {
- Map* map = Map::cast(array->get(i));
- maps->Add(handle(map, isolate));
- }
- return (array->length() - start_index) / 2;
- }
-
- return 0;
-}
-
-
-MaybeHandle<Code> FeedbackNexus::FindHandlerForMap(int start_index,
- Handle<Map> map) const {
- Object* feedback = GetFeedback();
- if (feedback->IsFixedArray()) {
- FixedArray* array = FixedArray::cast(feedback);
- for (int i = start_index; i < array->length(); i += 2) {
- Map* array_map = Map::cast(array->get(i));
- if (array_map == *map) {
- Code* code = Code::cast(array->get(i + 1));
- DCHECK(code->kind() == Code::HANDLER);
- return handle(code);
- }
- }
- }
-
- return MaybeHandle<Code>();
-}
-
-
-bool FeedbackNexus::FindHandlers(int start_index, CodeHandleList* code_list,
- int length) const {
- Object* feedback = GetFeedback();
- int count = 0;
- if (feedback->IsFixedArray()) {
- FixedArray* array = FixedArray::cast(feedback);
- // The array should be of the form [<optional name>], then
- // [map, handler, map, handler, ... ]
- DCHECK(array->length() >= (2 + start_index));
- for (int i = start_index; i < array->length(); i += 2) {
- Code* code = Code::cast(array->get(i + 1));
- DCHECK(code->kind() == Code::HANDLER);
- code_list->Add(handle(code));
- count++;
- }
- }
- return count == length;
-}
}
} // namespace v8::internal
DISALLOW_IMPLICIT_CONSTRUCTORS(TypeFeedbackVector);
};
-
-
-// A FeedbackNexus is the combination of a TypeFeedbackVector and a slot.
-// Derived classes customize the update and retrieval of feedback.
-class FeedbackNexus {
- public:
- FeedbackNexus(Handle<TypeFeedbackVector> vector, FeedbackVectorICSlot slot)
- : vector_handle_(vector), use_handle_(true), slot_(slot) {}
- FeedbackNexus(TypeFeedbackVector* vector, FeedbackVectorICSlot slot)
- : vector_(vector), use_handle_(false), slot_(slot) {}
- virtual ~FeedbackNexus() {}
-
- Handle<TypeFeedbackVector> vector_handle() const {
- DCHECK(use_handle_);
- return vector_handle_;
- }
- TypeFeedbackVector* vector() const {
- return use_handle_ ? *vector_handle_ : vector_;
- }
- FeedbackVectorICSlot slot() const { return slot_; }
-
- InlineCacheState ic_state() const { return StateFromFeedback(); }
- Map* FindFirstMap() const {
- MapHandleList maps;
- ExtractMaps(&maps);
- if (maps.length() > 0) return *maps.at(0);
- return NULL;
- }
-
- virtual InlineCacheState StateFromFeedback() const = 0;
- virtual int ExtractMaps(MapHandleList* maps) const = 0;
- virtual MaybeHandle<Code> FindHandlerForMap(Handle<Map> map) const = 0;
- virtual bool FindHandlers(CodeHandleList* code_list, int length = -1) const {
- return length == 0;
- }
- virtual Name* FindFirstName() const { return NULL; }
-
- Object* GetFeedback() const { return vector()->Get(slot()); }
-
- protected:
- Isolate* GetIsolate() const { return vector()->GetIsolate(); }
-
- void SetFeedback(Object* feedback,
- WriteBarrierMode mode = UPDATE_WRITE_BARRIER) {
- vector()->Set(slot(), feedback, mode);
- }
-
- Handle<FixedArray> EnsureArrayOfSize(int length);
- void InstallHandlers(int start_index, TypeHandleList* types,
- CodeHandleList* handlers);
- int ExtractMaps(int start_index, MapHandleList* maps) const;
- MaybeHandle<Code> FindHandlerForMap(int start_index, Handle<Map> map) const;
- bool FindHandlers(int start_index, CodeHandleList* code_list,
- int length) const;
-
- private:
- // The reason for the union is that we can use handles during IC miss,
- // but not during GC when we clear ICs. If you have a handle to the
- // vector that is better because more operations can be done, like
- // allocation.
- union {
- Handle<TypeFeedbackVector> vector_handle_;
- TypeFeedbackVector* vector_;
- };
- bool use_handle_;
- FeedbackVectorICSlot slot_;
-};
-
-
-class CallICNexus : public FeedbackNexus {
- public:
- CallICNexus(Handle<TypeFeedbackVector> vector, FeedbackVectorICSlot slot)
- : FeedbackNexus(vector, slot) {
- DCHECK(vector->GetKind(slot) == Code::CALL_IC);
- }
- CallICNexus(TypeFeedbackVector* vector, FeedbackVectorICSlot slot)
- : FeedbackNexus(vector, slot) {
- DCHECK(vector->GetKind(slot) == Code::CALL_IC);
- }
-
- void ConfigureUninitialized();
- void ConfigureGeneric();
- void ConfigureMonomorphicArray();
- void ConfigureMonomorphic(Handle<JSFunction> function);
-
- virtual InlineCacheState StateFromFeedback() const OVERRIDE;
-
- virtual int ExtractMaps(MapHandleList* maps) const OVERRIDE {
- // CallICs don't record map feedback.
- return 0;
- }
- virtual MaybeHandle<Code> FindHandlerForMap(Handle<Map> map) const OVERRIDE {
- return MaybeHandle<Code>();
- }
- virtual bool FindHandlers(CodeHandleList* code_list,
- int length = -1) const OVERRIDE {
- return length == 0;
- }
-};
}
} // namespace v8::internal
// Set metadata.
for (int i = 0; i < 30; i++) {
Code::Kind kind;
- if (i % 3 == 0) {
+ if (i % 3 == 0)
kind = Code::CALL_IC;
- } else if (i % 3 == 1) {
+ else if (i % 3 == 1)
kind = Code::LOAD_IC;
- } else {
+ else
kind = Code::KEYED_LOAD_IC;
- }
vector->SetKind(FeedbackVectorICSlot(i), kind);
}
CHECK(
feedback_vector->Get(FeedbackVectorICSlot(ic_slot))->IsAllocationSite());
}
-
-
-TEST(VectorCallICStates) {
- if (i::FLAG_always_opt) return;
- CcTest::InitializeVM();
- LocalContext context;
- v8::HandleScope scope(context->GetIsolate());
- Isolate* isolate = CcTest::i_isolate();
- Heap* heap = isolate->heap();
-
- // Make sure function f has a call that uses a type feedback slot.
- CompileRun(
- "function foo() { return 17; }"
- "function f(a) { a(); } f(foo);");
- Handle<JSFunction> f = v8::Utils::OpenHandle(
- *v8::Handle<v8::Function>::Cast(CcTest::global()->Get(v8_str("f"))));
- // There should be one IC.
- Handle<TypeFeedbackVector> feedback_vector =
- Handle<TypeFeedbackVector>(f->shared()->feedback_vector(), isolate);
- FeedbackVectorICSlot slot(FLAG_vector_ics ? 1 : 0);
- CallICNexus nexus(feedback_vector, slot);
- CHECK_EQ(MONOMORPHIC, nexus.StateFromFeedback());
- // CallIC doesn't return map feedback.
- CHECK_EQ(NULL, nexus.FindFirstMap());
-
- CompileRun("f(function() { return 16; })");
- CHECK_EQ(GENERIC, nexus.StateFromFeedback());
-
- // After a collection, state should be reset to UNINITIALIZED.
- heap->CollectAllGarbage(i::Heap::kNoGCFlags);
- CHECK_EQ(UNINITIALIZED, nexus.StateFromFeedback());
-
- // Array is special. It will remain monomorphic across gcs and it contains an
- // AllocationSite.
- CompileRun("f(Array)");
- CHECK_EQ(MONOMORPHIC, nexus.StateFromFeedback());
- CHECK(feedback_vector->Get(FeedbackVectorICSlot(slot))->IsAllocationSite());
-
- heap->CollectAllGarbage(i::Heap::kNoGCFlags);
- CHECK_EQ(MONOMORPHIC, nexus.StateFromFeedback());
-}
}
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