blob: dfd88862bd08413f06f57675c2a44a5600fe49b6 [file] [log] [blame]
// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/ic/accessor-assembler.h"
#include "src/code-factory.h"
#include "src/code-stubs.h"
#include "src/counters.h"
#include "src/ic/handler-configuration.h"
#include "src/ic/ic.h"
#include "src/ic/stub-cache.h"
#include "src/objects-inl.h"
namespace v8 {
namespace internal {
using compiler::CodeAssemblerState;
using compiler::Node;
//////////////////// Private helpers.
// Loads dataX field from the DataHandler object.
Node* AccessorAssembler::LoadHandlerDataField(Node* handler, int data_index) {
#ifdef DEBUG
Node* handler_map = LoadMap(handler);
Node* instance_type = LoadMapInstanceType(handler_map);
#endif
CSA_ASSERT(this,
Word32Or(InstanceTypeEqual(instance_type, LOAD_HANDLER_TYPE),
InstanceTypeEqual(instance_type, STORE_HANDLER_TYPE)));
int offset = 0;
int minimum_size = 0;
switch (data_index) {
case 1:
offset = DataHandler::kData1Offset;
minimum_size = DataHandler::kSizeWithData1;
break;
case 2:
offset = DataHandler::kData2Offset;
minimum_size = DataHandler::kSizeWithData2;
break;
case 3:
offset = DataHandler::kData3Offset;
minimum_size = DataHandler::kSizeWithData3;
break;
default:
UNREACHABLE();
break;
}
USE(minimum_size);
CSA_ASSERT(this, UintPtrGreaterThanOrEqual(
LoadMapInstanceSizeInWords(handler_map),
IntPtrConstant(minimum_size / kPointerSize)));
return LoadObjectField(handler, offset);
}
Node* AccessorAssembler::TryMonomorphicCase(Node* slot, Node* vector,
Node* receiver_map,
Label* if_handler,
Variable* var_handler,
Label* if_miss) {
Comment("TryMonomorphicCase");
DCHECK_EQ(MachineRepresentation::kTagged, var_handler->rep());
// TODO(ishell): add helper class that hides offset computations for a series
// of loads.
CSA_ASSERT(this, IsFeedbackVector(vector), vector);
int32_t header_size = FeedbackVector::kFeedbackSlotsOffset - kHeapObjectTag;
// Adding |header_size| with a separate IntPtrAdd rather than passing it
// into ElementOffsetFromIndex() allows it to be folded into a single
// [base, index, offset] indirect memory access on x64.
Node* offset = ElementOffsetFromIndex(slot, HOLEY_ELEMENTS, SMI_PARAMETERS);
Node* feedback = Load(MachineType::AnyTagged(), vector,
IntPtrAdd(offset, IntPtrConstant(header_size)));
// Try to quickly handle the monomorphic case without knowing for sure
// if we have a weak cell in feedback. We do know it's safe to look
// at WeakCell::kValueOffset.
GotoIf(WordNotEqual(receiver_map, LoadWeakCellValueUnchecked(feedback)),
if_miss);
Node* handler =
Load(MachineType::AnyTagged(), vector,
IntPtrAdd(offset, IntPtrConstant(header_size + kPointerSize)));
var_handler->Bind(handler);
Goto(if_handler);
return feedback;
}
void AccessorAssembler::HandlePolymorphicCase(Node* receiver_map,
Node* feedback, Label* if_handler,
Variable* var_handler,
Label* if_miss,
int min_feedback_capacity) {
Comment("HandlePolymorphicCase");
DCHECK_EQ(MachineRepresentation::kTagged, var_handler->rep());
// Deferred so the unrolled case can omit frame construction in bytecode
// handler.
Label loop(this, Label::kDeferred);
// Iterate {feedback} array.
const int kEntrySize = 2;
// Loading feedback's length is delayed until we need it when looking past
// the first {min_feedback_capacity} (map, handler) pairs.
Node* length = nullptr;
CSA_ASSERT(this, SmiGreaterThanOrEqual(
LoadFixedArrayBaseLength(feedback),
SmiConstant(min_feedback_capacity * kEntrySize)));
const int kUnrolledIterations = IC::kMaxPolymorphicMapCount;
for (int i = 0; i < kUnrolledIterations; i++) {
int map_index = i * kEntrySize;
int handler_index = i * kEntrySize + 1;
if (i >= min_feedback_capacity) {
if (length == nullptr) length = LoadFixedArrayBaseLength(feedback);
GotoIf(SmiGreaterThanOrEqual(SmiConstant(handler_index), length),
if_miss);
}
Label next_entry(this);
Node* cached_map =
LoadWeakCellValue(LoadFixedArrayElement(feedback, map_index));
GotoIf(WordNotEqual(receiver_map, cached_map), &next_entry);
// Found, now call handler.
Node* handler = LoadFixedArrayElement(feedback, handler_index);
var_handler->Bind(handler);
Goto(if_handler);
BIND(&next_entry);
}
Goto(&loop);
// Loop from {kUnrolledIterations}*kEntrySize to {length}.
BIND(&loop);
Node* start_index = IntPtrConstant(kUnrolledIterations * kEntrySize);
Node* end_index = LoadAndUntagFixedArrayBaseLength(feedback);
BuildFastLoop(
start_index, end_index,
[this, receiver_map, feedback, if_handler, var_handler](Node* index) {
Node* cached_map =
LoadWeakCellValue(LoadFixedArrayElement(feedback, index));
Label next_entry(this);
GotoIf(WordNotEqual(receiver_map, cached_map), &next_entry);
// Found, now call handler.
Node* handler = LoadFixedArrayElement(feedback, index, kPointerSize);
var_handler->Bind(handler);
Goto(if_handler);
BIND(&next_entry);
},
kEntrySize, INTPTR_PARAMETERS, IndexAdvanceMode::kPost);
// The loop falls through if no handler was found.
Goto(if_miss);
}
void AccessorAssembler::HandleLoadICHandlerCase(
const LoadICParameters* p, Node* handler, Label* miss,
ExitPoint* exit_point, ICMode ic_mode, OnNonExistent on_nonexistent,
ElementSupport support_elements) {
Comment("have_handler");
VARIABLE(var_holder, MachineRepresentation::kTagged, p->holder);
VARIABLE(var_smi_handler, MachineRepresentation::kTagged, handler);
Variable* vars[] = {&var_holder, &var_smi_handler};
Label if_smi_handler(this, 2, vars);
Label try_proto_handler(this, Label::kDeferred),
call_handler(this, Label::kDeferred);
Branch(TaggedIsSmi(handler), &if_smi_handler, &try_proto_handler);
// |handler| is a Smi, encoding what to do. See SmiHandler methods
// for the encoding format.
BIND(&if_smi_handler);
{
HandleLoadICSmiHandlerCase(p, var_holder.value(), var_smi_handler.value(),
handler, miss, exit_point, on_nonexistent,
support_elements);
}
BIND(&try_proto_handler);
{
GotoIf(IsCodeMap(LoadMap(handler)), &call_handler);
HandleLoadICProtoHandler(p, handler, &var_holder, &var_smi_handler,
&if_smi_handler, miss, exit_point, ic_mode);
}
BIND(&call_handler);
{
typedef LoadWithVectorDescriptor Descriptor;
exit_point->ReturnCallStub(Descriptor(isolate()), handler, p->context,
p->receiver, p->name, p->slot, p->vector);
}
}
void AccessorAssembler::HandleLoadField(Node* holder, Node* handler_word,
Variable* var_double_value,
Label* rebox_double,
ExitPoint* exit_point) {
Comment("field_load");
Node* index = DecodeWord<LoadHandler::FieldIndexBits>(handler_word);
Node* offset = IntPtrMul(index, IntPtrConstant(kPointerSize));
Label inobject(this), out_of_object(this);
Branch(IsSetWord<LoadHandler::IsInobjectBits>(handler_word), &inobject,
&out_of_object);
BIND(&inobject);
{
Label is_double(this);
GotoIf(IsSetWord<LoadHandler::IsDoubleBits>(handler_word), &is_double);
exit_point->Return(LoadObjectField(holder, offset));
BIND(&is_double);
if (FLAG_unbox_double_fields) {
var_double_value->Bind(
LoadObjectField(holder, offset, MachineType::Float64()));
} else {
Node* mutable_heap_number = LoadObjectField(holder, offset);
var_double_value->Bind(LoadHeapNumberValue(mutable_heap_number));
}
Goto(rebox_double);
}
BIND(&out_of_object);
{
Label is_double(this);
Node* properties = LoadFastProperties(holder);
Node* value = LoadObjectField(properties, offset);
GotoIf(IsSetWord<LoadHandler::IsDoubleBits>(handler_word), &is_double);
exit_point->Return(value);
BIND(&is_double);
var_double_value->Bind(LoadHeapNumberValue(value));
Goto(rebox_double);
}
}
Node* AccessorAssembler::LoadDescriptorValue(Node* map, Node* descriptor) {
Node* descriptors = LoadMapDescriptors(map);
Node* scaled_descriptor =
IntPtrMul(descriptor, IntPtrConstant(DescriptorArray::kEntrySize));
Node* value_index = IntPtrAdd(
scaled_descriptor, IntPtrConstant(DescriptorArray::kFirstIndex +
DescriptorArray::kEntryValueIndex));
CSA_ASSERT(this, UintPtrLessThan(descriptor, LoadAndUntagFixedArrayBaseLength(
descriptors)));
return LoadFixedArrayElement(descriptors, value_index);
}
void AccessorAssembler::HandleLoadICSmiHandlerCase(
const LoadICParameters* p, Node* holder, Node* smi_handler, Node* handler,
Label* miss, ExitPoint* exit_point, OnNonExistent on_nonexistent,
ElementSupport support_elements) {
VARIABLE(var_double_value, MachineRepresentation::kFloat64);
Label rebox_double(this, &var_double_value);
Node* handler_word = SmiUntag(smi_handler);
Node* handler_kind = DecodeWord<LoadHandler::KindBits>(handler_word);
if (support_elements == kSupportElements) {
Label if_element(this), if_indexed_string(this), if_property(this);
GotoIf(WordEqual(handler_kind, IntPtrConstant(LoadHandler::kElement)),
&if_element);
Branch(WordEqual(handler_kind, IntPtrConstant(LoadHandler::kIndexedString)),
&if_indexed_string, &if_property);
BIND(&if_element);
Comment("element_load");
Node* intptr_index = TryToIntptr(p->name, miss);
Node* elements = LoadElements(holder);
Node* is_jsarray_condition =
IsSetWord<LoadHandler::IsJsArrayBits>(handler_word);
Node* elements_kind =
DecodeWord32FromWord<LoadHandler::ElementsKindBits>(handler_word);
Label if_hole(this), unimplemented_elements_kind(this),
if_oob(this, Label::kDeferred);
EmitElementLoad(holder, elements, elements_kind, intptr_index,
is_jsarray_condition, &if_hole, &rebox_double,
&var_double_value, &unimplemented_elements_kind, &if_oob,
miss, exit_point);
BIND(&unimplemented_elements_kind);
{
// Smi handlers should only be installed for supported elements kinds.
// Crash if we get here.
DebugBreak();
Goto(miss);
}
BIND(&if_oob);
{
Comment("out of bounds elements access");
Label return_undefined(this);
// Negative indices aren't valid array indices (according to
// the ECMAScript specification), and are stored as properties
// in V8, not elements. So we cannot handle them here.
GotoIf(IntPtrLessThan(intptr_index, IntPtrConstant(0)), miss);
// Check if we're allowed to handle OOB accesses.
Node* allow_out_of_bounds =
IsSetWord<LoadHandler::AllowOutOfBoundsBits>(handler_word);
GotoIfNot(allow_out_of_bounds, miss);
// For typed arrays we never lookup elements in the prototype chain.
GotoIf(IsJSTypedArray(holder), &return_undefined);
// For all other receivers we need to check that the prototype chain
// doesn't contain any elements.
BranchIfPrototypesHaveNoElements(LoadMap(holder), &return_undefined,
miss);
BIND(&return_undefined);
exit_point->Return(UndefinedConstant());
}
BIND(&if_hole);
{
Comment("convert hole");
GotoIfNot(IsSetWord<LoadHandler::ConvertHoleBits>(handler_word), miss);
GotoIf(IsNoElementsProtectorCellInvalid(), miss);
exit_point->Return(UndefinedConstant());
}
BIND(&if_indexed_string);
{
Label if_oob(this, Label::kDeferred);
Comment("indexed string");
Node* intptr_index = TryToIntptr(p->name, miss);
Node* length = LoadStringLengthAsWord(holder);
GotoIf(UintPtrGreaterThanOrEqual(intptr_index, length), &if_oob);
TNode<Int32T> code = StringCharCodeAt(holder, intptr_index);
TNode<String> result = StringFromCharCode(code);
Return(result);
BIND(&if_oob);
Node* allow_out_of_bounds =
IsSetWord<LoadHandler::AllowOutOfBoundsBits>(handler_word);
GotoIfNot(allow_out_of_bounds, miss);
GotoIf(IsNoElementsProtectorCellInvalid(), miss);
Return(UndefinedConstant());
}
BIND(&if_property);
Comment("property_load");
}
Label constant(this), field(this), normal(this, Label::kDeferred),
interceptor(this, Label::kDeferred), nonexistent(this),
accessor(this, Label::kDeferred), global(this, Label::kDeferred),
module_export(this, Label::kDeferred), proxy(this, Label::kDeferred),
native_data_property(this), api_getter(this);
GotoIf(WordEqual(handler_kind, IntPtrConstant(LoadHandler::kField)), &field);
GotoIf(WordEqual(handler_kind, IntPtrConstant(LoadHandler::kConstant)),
&constant);
GotoIf(WordEqual(handler_kind, IntPtrConstant(LoadHandler::kNonExistent)),
&nonexistent);
GotoIf(WordEqual(handler_kind, IntPtrConstant(LoadHandler::kNormal)),
&normal);
GotoIf(WordEqual(handler_kind, IntPtrConstant(LoadHandler::kAccessor)),
&accessor);
GotoIf(
WordEqual(handler_kind, IntPtrConstant(LoadHandler::kNativeDataProperty)),
&native_data_property);
GotoIf(WordEqual(handler_kind, IntPtrConstant(LoadHandler::kApiGetter)),
&api_getter);
GotoIf(WordEqual(handler_kind,
IntPtrConstant(LoadHandler::kApiGetterHolderIsPrototype)),
&api_getter);
GotoIf(WordEqual(handler_kind, IntPtrConstant(LoadHandler::kGlobal)),
&global);
GotoIf(WordEqual(handler_kind, IntPtrConstant(LoadHandler::kProxy)), &proxy);
Branch(WordEqual(handler_kind, IntPtrConstant(LoadHandler::kModuleExport)),
&module_export, &interceptor);
BIND(&field);
HandleLoadField(holder, handler_word, &var_double_value, &rebox_double,
exit_point);
BIND(&nonexistent);
// This is a handler for a load of a non-existent value.
if (on_nonexistent == OnNonExistent::kThrowReferenceError) {
exit_point->ReturnCallRuntime(Runtime::kThrowReferenceError, p->context,
p->name);
} else {
DCHECK_EQ(OnNonExistent::kReturnUndefined, on_nonexistent);
exit_point->Return(UndefinedConstant());
}
BIND(&constant);
{
Comment("constant_load");
Node* descriptor = DecodeWord<LoadHandler::DescriptorBits>(handler_word);
Node* value = LoadDescriptorValue(LoadMap(holder), descriptor);
exit_point->Return(value);
}
BIND(&normal);
{
Comment("load_normal");
Node* properties = LoadSlowProperties(holder);
VARIABLE(var_name_index, MachineType::PointerRepresentation());
Label found(this, &var_name_index);
NameDictionaryLookup<NameDictionary>(properties, p->name, &found,
&var_name_index, miss);
BIND(&found);
{
VARIABLE(var_details, MachineRepresentation::kWord32);
VARIABLE(var_value, MachineRepresentation::kTagged);
LoadPropertyFromNameDictionary(properties, var_name_index.value(),
&var_details, &var_value);
Node* value = CallGetterIfAccessor(var_value.value(), var_details.value(),
p->context, p->receiver, miss);
exit_point->Return(value);
}
}
BIND(&accessor);
{
Comment("accessor_load");
Node* descriptor = DecodeWord<LoadHandler::DescriptorBits>(handler_word);
Node* accessor_pair = LoadDescriptorValue(LoadMap(holder), descriptor);
CSA_ASSERT(this, IsAccessorPair(accessor_pair));
Node* getter = LoadObjectField(accessor_pair, AccessorPair::kGetterOffset);
CSA_ASSERT(this, Word32BinaryNot(IsTheHole(getter)));
Callable callable = CodeFactory::Call(isolate());
exit_point->Return(CallJS(callable, p->context, getter, p->receiver));
}
BIND(&native_data_property);
{
Comment("native_data_property_load");
Node* descriptor = DecodeWord<LoadHandler::DescriptorBits>(handler_word);
Node* accessor_info = LoadDescriptorValue(LoadMap(holder), descriptor);
Callable callable = CodeFactory::ApiGetter(isolate());
exit_point->ReturnCallStub(callable, p->context, p->receiver, holder,
accessor_info);
}
BIND(&api_getter);
{
Comment("api_getter");
CSA_ASSERT(this, TaggedIsNotSmi(handler));
Node* call_handler_info = holder;
// Context is stored either in data2 or data3 field depending on whether
// the access check is enabled for this handler or not.
Node* context_cell = Select(
IsSetWord<LoadHandler::DoAccessCheckOnReceiverBits>(handler_word),
[=] { return LoadHandlerDataField(handler, 3); },
[=] { return LoadHandlerDataField(handler, 2); },
MachineRepresentation::kTagged);
Node* context = LoadWeakCellValueUnchecked(context_cell);
Node* foreign =
LoadObjectField(call_handler_info, CallHandlerInfo::kJsCallbackOffset);
Node* callback = LoadObjectField(foreign, Foreign::kForeignAddressOffset,
MachineType::Pointer());
Node* data =
LoadObjectField(call_handler_info, CallHandlerInfo::kDataOffset);
VARIABLE(api_holder, MachineRepresentation::kTagged, p->receiver);
Label load(this);
GotoIf(WordEqual(handler_kind, IntPtrConstant(LoadHandler::kApiGetter)),
&load);
CSA_ASSERT(
this,
WordEqual(handler_kind,
IntPtrConstant(LoadHandler::kApiGetterHolderIsPrototype)));
api_holder.Bind(LoadMapPrototype(LoadMap(p->receiver)));
Goto(&load);
BIND(&load);
Callable callable = CodeFactory::CallApiCallback(isolate(), 0);
exit_point->Return(CallStub(callable, nullptr, context, data,
api_holder.value(), callback, p->receiver));
}
BIND(&proxy);
{
VARIABLE(var_index, MachineType::PointerRepresentation());
VARIABLE(var_unique, MachineRepresentation::kTagged);
Label if_index(this), if_unique_name(this),
to_name_failed(this, Label::kDeferred);
if (support_elements == kSupportElements) {
TryToName(p->name, &if_index, &var_index, &if_unique_name, &var_unique,
&to_name_failed);
BIND(&if_unique_name);
exit_point->ReturnCallStub(
Builtins::CallableFor(isolate(), Builtins::kProxyGetProperty),
p->context, holder, var_unique.value(), p->receiver);
BIND(&if_index);
// TODO(mslekova): introduce TryToName that doesn't try to compute
// the intptr index value
Goto(&to_name_failed);
BIND(&to_name_failed);
exit_point->ReturnCallRuntime(Runtime::kGetPropertyWithReceiver,
p->context, holder, p->name, p->receiver);
} else {
exit_point->ReturnCallStub(
Builtins::CallableFor(isolate(), Builtins::kProxyGetProperty),
p->context, holder, p->name, p->receiver);
}
}
BIND(&global);
{
CSA_ASSERT(this, IsPropertyCell(holder));
// Ensure the property cell doesn't contain the hole.
Node* value = LoadObjectField(holder, PropertyCell::kValueOffset);
Node* details =
LoadAndUntagToWord32ObjectField(holder, PropertyCell::kDetailsOffset);
GotoIf(IsTheHole(value), miss);
exit_point->Return(
CallGetterIfAccessor(value, details, p->context, p->receiver, miss));
}
BIND(&interceptor);
{
Comment("load_interceptor");
exit_point->ReturnCallRuntime(Runtime::kLoadPropertyWithInterceptor,
p->context, p->name, p->receiver, holder,
p->slot, p->vector);
}
BIND(&module_export);
{
Comment("module export");
Node* index = DecodeWord<LoadHandler::ExportsIndexBits>(handler_word);
Node* module =
LoadObjectField(p->receiver, JSModuleNamespace::kModuleOffset,
MachineType::TaggedPointer());
Node* exports = LoadObjectField(module, Module::kExportsOffset,
MachineType::TaggedPointer());
Node* cell = LoadFixedArrayElement(exports, index);
// The handler is only installed for exports that exist.
CSA_ASSERT(this, IsCell(cell));
Node* value = LoadCellValue(cell);
Label is_the_hole(this, Label::kDeferred);
GotoIf(IsTheHole(value), &is_the_hole);
exit_point->Return(value);
BIND(&is_the_hole);
{
Node* message = SmiConstant(MessageTemplate::kNotDefined);
exit_point->ReturnCallRuntime(Runtime::kThrowReferenceError, p->context,
message, p->name);
}
}
BIND(&rebox_double);
exit_point->Return(AllocateHeapNumberWithValue(var_double_value.value()));
}
// Performs actions common to both load and store handlers:
// 1. Checks prototype validity cell.
// 2. If |on_code_handler| is provided, then it checks if the sub handler is
// a smi or code and if it's a code then it calls |on_code_handler| to
// generate a code that handles Code handlers.
// If |on_code_handler| is not provided, then only smi sub handler are
// expected.
// 3. Does access check on receiver if ICHandler::DoAccessCheckOnReceiverBits
// bit is set in the smi handler.
// 4. Does dictionary lookup on receiver if ICHandler::LookupOnReceiverBits bit
// is set in the smi handler. If |on_found_on_receiver| is provided then
// it calls it to generate a code that handles the "found on receiver case"
// or just misses if the |on_found_on_receiver| is not provided.
// 5. Falls through in a case of a smi handler which is returned from this
// function (tagged!).
// TODO(ishell): Remove templatezation once we move common bits from
// Load/StoreHandler to the base class.
template <typename ICHandler, typename ICParameters>
Node* AccessorAssembler::HandleProtoHandler(
const ICParameters* p, Node* handler, const OnCodeHandler& on_code_handler,
const OnFoundOnReceiver& on_found_on_receiver, Label* miss,
ICMode ic_mode) {
//
// Check prototype validity cell.
//
{
Label done(this);
Node* validity_cell =
LoadObjectField(handler, ICHandler::kValidityCellOffset);
GotoIf(WordEqual(validity_cell, SmiConstant(0)), &done);
Node* cell_value = LoadObjectField(validity_cell, Cell::kValueOffset);
GotoIf(WordNotEqual(cell_value, SmiConstant(Map::kPrototypeChainValid)),
miss);
Goto(&done);
BIND(&done);
}
//
// Check smi handler bits.
//
{
Node* smi_or_code_handler =
LoadObjectField(handler, ICHandler::kSmiHandlerOffset);
if (on_code_handler) {
Label if_smi_handler(this);
GotoIf(TaggedIsSmi(smi_or_code_handler), &if_smi_handler);
CSA_ASSERT(this, IsCodeMap(LoadMap(smi_or_code_handler)));
on_code_handler(smi_or_code_handler);
BIND(&if_smi_handler);
} else {
CSA_ASSERT(this, TaggedIsSmi(smi_or_code_handler));
}
Node* handler_flags = SmiUntag(smi_or_code_handler);
// Lookup on receiver and access checks are not necessary for global ICs
// because in the former case the validity cell check guards modifications
// of the global object and the latter is not applicable to the global
// object.
int mask = ICHandler::LookupOnReceiverBits::kMask |
ICHandler::DoAccessCheckOnReceiverBits::kMask;
if (ic_mode == ICMode::kGlobalIC) {
CSA_ASSERT(this, IsClearWord(handler_flags, mask));
} else {
DCHECK_EQ(ICMode::kNonGlobalIC, ic_mode);
Label done(this), if_do_access_check(this), if_lookup_on_receiver(this);
GotoIf(IsClearWord(handler_flags, mask), &done);
// Only one of the bits can be set at a time.
CSA_ASSERT(this,
WordNotEqual(WordAnd(handler_flags, IntPtrConstant(mask)),
IntPtrConstant(mask)));
Branch(IsSetWord<LoadHandler::DoAccessCheckOnReceiverBits>(handler_flags),
&if_do_access_check, &if_lookup_on_receiver);
BIND(&if_do_access_check);
{
Node* data2 = LoadHandlerDataField(handler, 2);
Node* expected_native_context = LoadWeakCellValue(data2, miss);
EmitAccessCheck(expected_native_context, p->context, p->receiver, &done,
miss);
}
// Dictionary lookup on receiver is not necessary for Load/StoreGlobalIC
// because prototype validity cell check already guards modifications of
// the global object.
BIND(&if_lookup_on_receiver);
{
DCHECK_EQ(ICMode::kNonGlobalIC, ic_mode);
CSA_ASSERT(this, Word32BinaryNot(HasInstanceType(
p->receiver, JS_GLOBAL_OBJECT_TYPE)));
Node* properties = LoadSlowProperties(p->receiver);
VARIABLE(var_name_index, MachineType::PointerRepresentation());
Label found(this, &var_name_index);
NameDictionaryLookup<NameDictionary>(properties, p->name, &found,
&var_name_index, &done);
BIND(&found);
{
if (on_found_on_receiver) {
on_found_on_receiver(properties, var_name_index.value());
} else {
Goto(miss);
}
}
}
BIND(&done);
}
return smi_or_code_handler;
}
}
void AccessorAssembler::HandleLoadICProtoHandler(
const LoadICParameters* p, Node* handler, Variable* var_holder,
Variable* var_smi_handler, Label* if_smi_handler, Label* miss,
ExitPoint* exit_point, ICMode ic_mode) {
DCHECK_EQ(MachineRepresentation::kTagged, var_holder->rep());
DCHECK_EQ(MachineRepresentation::kTagged, var_smi_handler->rep());
Node* smi_handler = HandleProtoHandler<LoadHandler>(
p, handler,
// Code sub-handlers are not expected in LoadICs, so no |on_code_handler|.
nullptr,
// on_found_on_receiver
[=](Node* properties, Node* name_index) {
VARIABLE(var_details, MachineRepresentation::kWord32);
VARIABLE(var_value, MachineRepresentation::kTagged);
LoadPropertyFromNameDictionary(properties, name_index, &var_details,
&var_value);
Node* value =
CallGetterIfAccessor(var_value.value(), var_details.value(),
p->context, p->receiver, miss);
exit_point->Return(value);
},
miss, ic_mode);
Node* maybe_holder_cell = LoadHandlerDataField(handler, 1);
Label load_from_cached_holder(this), done(this);
Branch(IsNull(maybe_holder_cell), &done, &load_from_cached_holder);
BIND(&load_from_cached_holder);
{
// For regular holders, having passed the receiver map check and the
// validity cell check implies that |holder| is alive. However, for
// global object receivers, the |maybe_holder_cell| may be cleared.
Node* holder = LoadWeakCellValue(maybe_holder_cell, miss);
var_holder->Bind(holder);
Goto(&done);
}
BIND(&done);
{
var_smi_handler->Bind(smi_handler);
Goto(if_smi_handler);
}
}
void AccessorAssembler::EmitAccessCheck(Node* expected_native_context,
Node* context, Node* receiver,
Label* can_access, Label* miss) {
CSA_ASSERT(this, IsNativeContext(expected_native_context));
Node* native_context = LoadNativeContext(context);
GotoIf(WordEqual(expected_native_context, native_context), can_access);
// If the receiver is not a JSGlobalProxy then we miss.
GotoIfNot(IsJSGlobalProxy(receiver), miss);
// For JSGlobalProxy receiver try to compare security tokens of current
// and expected native contexts.
Node* expected_token = LoadContextElement(expected_native_context,
Context::SECURITY_TOKEN_INDEX);
Node* current_token =
LoadContextElement(native_context, Context::SECURITY_TOKEN_INDEX);
Branch(WordEqual(expected_token, current_token), can_access, miss);
}
void AccessorAssembler::JumpIfDataProperty(Node* details, Label* writable,
Label* readonly) {
// Accessor properties never have the READ_ONLY attribute set.
GotoIf(IsSetWord32(details, PropertyDetails::kAttributesReadOnlyMask),
readonly);
Node* kind = DecodeWord32<PropertyDetails::KindField>(details);
GotoIf(Word32Equal(kind, Int32Constant(kData)), writable);
// Fall through if it's an accessor property.
}
void AccessorAssembler::HandleStoreICNativeDataProperty(
const StoreICParameters* p, Node* holder, Node* handler_word) {
Node* descriptor = DecodeWord<StoreHandler::DescriptorBits>(handler_word);
Node* accessor_info = LoadDescriptorValue(LoadMap(holder), descriptor);
CSA_CHECK(this, IsAccessorInfo(accessor_info));
Node* language_mode = GetLanguageMode(p->vector, p->slot);
TailCallRuntime(Runtime::kStoreCallbackProperty, p->context, p->receiver,
holder, accessor_info, p->name, p->value, language_mode);
}
void AccessorAssembler::HandleStoreICHandlerCase(
const StoreICParameters* p, Node* handler, Label* miss, ICMode ic_mode,
ElementSupport support_elements) {
Label if_smi_handler(this), if_nonsmi_handler(this);
Label if_proto_handler(this), if_element_handler(this), call_handler(this),
store_global(this);
Branch(TaggedIsSmi(handler), &if_smi_handler, &if_nonsmi_handler);
// |handler| is a Smi, encoding what to do. See SmiHandler methods
// for the encoding format.
BIND(&if_smi_handler);
{
Node* holder = p->receiver;
Node* handler_word = SmiUntag(handler);
Label if_fast_smi(this), if_proxy(this);
STATIC_ASSERT(StoreHandler::kGlobalProxy + 1 == StoreHandler::kNormal);
STATIC_ASSERT(StoreHandler::kNormal + 1 == StoreHandler::kProxy);
STATIC_ASSERT(StoreHandler::kProxy + 1 == StoreHandler::kKindsNumber);
Node* handler_kind = DecodeWord<StoreHandler::KindBits>(handler_word);
GotoIf(IntPtrLessThan(handler_kind,
IntPtrConstant(StoreHandler::kGlobalProxy)),
&if_fast_smi);
GotoIf(WordEqual(handler_kind, IntPtrConstant(StoreHandler::kProxy)),
&if_proxy);
CSA_ASSERT(this,
WordEqual(handler_kind, IntPtrConstant(StoreHandler::kNormal)));
Node* properties = LoadSlowProperties(holder);
VARIABLE(var_name_index, MachineType::PointerRepresentation());
Label dictionary_found(this, &var_name_index);
NameDictionaryLookup<NameDictionary>(properties, p->name, &dictionary_found,
&var_name_index, miss);
BIND(&dictionary_found);
{
Node* details = LoadDetailsByKeyIndex<NameDictionary>(
properties, var_name_index.value());
// Check that the property is a writable data property (no accessor).
const int kTypeAndReadOnlyMask = PropertyDetails::KindField::kMask |
PropertyDetails::kAttributesReadOnlyMask;
STATIC_ASSERT(kData == 0);
GotoIf(IsSetWord32(details, kTypeAndReadOnlyMask), miss);
StoreValueByKeyIndex<NameDictionary>(properties, var_name_index.value(),
p->value);
Return(p->value);
}
BIND(&if_fast_smi);
{
Node* handler_kind = DecodeWord<StoreHandler::KindBits>(handler_word);
Label data(this), accessor(this), native_data_property(this);
GotoIf(WordEqual(handler_kind, IntPtrConstant(StoreHandler::kAccessor)),
&accessor);
Branch(WordEqual(handler_kind,
IntPtrConstant(StoreHandler::kNativeDataProperty)),
&native_data_property, &data);
BIND(&accessor);
HandleStoreAccessor(p, holder, handler_word);
BIND(&native_data_property);
HandleStoreICNativeDataProperty(p, holder, handler_word);
BIND(&data);
// Handle non-transitioning field stores.
HandleStoreICSmiHandlerCase(handler_word, holder, p->value, nullptr,
miss);
}
BIND(&if_proxy);
HandleStoreToProxy(p, holder, miss, support_elements);
}
BIND(&if_nonsmi_handler);
{
Node* handler_map = LoadMap(handler);
GotoIf(IsWeakCellMap(handler_map), &store_global);
Branch(IsCodeMap(handler_map), &call_handler, &if_proto_handler);
}
BIND(&if_proto_handler);
HandleStoreICProtoHandler(p, handler, miss, ic_mode, support_elements);
// |handler| is a heap object. Must be code, call it.
BIND(&call_handler);
{
StoreWithVectorDescriptor descriptor(isolate());
TailCallStub(descriptor, handler, p->context, p->receiver, p->name,
p->value, p->slot, p->vector);
}
BIND(&store_global);
{
// Load value or miss if the {handler} weak cell is cleared.
Node* cell = LoadWeakCellValue(handler, miss);
ExitPoint direct_exit(this);
StoreGlobalIC_PropertyCellCase(cell, p->value, &direct_exit, miss);
}
}
void AccessorAssembler::HandleStoreAccessor(const StoreICParameters* p,
Node* holder, Node* handler_word) {
Comment("accessor_store");
Node* descriptor = DecodeWord<StoreHandler::DescriptorBits>(handler_word);
Node* accessor_pair = LoadDescriptorValue(LoadMap(holder), descriptor);
CSA_ASSERT(this, IsAccessorPair(accessor_pair));
Node* setter = LoadObjectField(accessor_pair, AccessorPair::kSetterOffset);
CSA_ASSERT(this, Word32BinaryNot(IsTheHole(setter)));
Callable callable = CodeFactory::Call(isolate());
Return(CallJS(callable, p->context, setter, p->receiver, p->value));
}
void AccessorAssembler::HandleStoreICProtoHandler(
const StoreICParameters* p, Node* handler, Label* miss, ICMode ic_mode,
ElementSupport support_elements) {
Comment("HandleStoreICProtoHandler");
OnCodeHandler on_code_handler;
if (support_elements == kSupportElements) {
// Code sub-handlers are expected only in KeyedStoreICs.
on_code_handler = [=](Node* code_handler) {
// This is either element store or transitioning element store.
Label if_element_store(this), if_transitioning_element_store(this);
Branch(IsStoreHandler0Map(LoadMap(handler)), &if_element_store,
&if_transitioning_element_store);
BIND(&if_element_store);
{
StoreWithVectorDescriptor descriptor(isolate());
TailCallStub(descriptor, code_handler, p->context, p->receiver, p->name,
p->value, p->slot, p->vector);
}
BIND(&if_transitioning_element_store);
{
Node* transition_map_cell = LoadHandlerDataField(handler, 1);
Node* transition_map = LoadWeakCellValue(transition_map_cell, miss);
CSA_ASSERT(this, IsMap(transition_map));
GotoIf(IsDeprecatedMap(transition_map), miss);
StoreTransitionDescriptor descriptor(isolate());
TailCallStub(descriptor, code_handler, p->context, p->receiver, p->name,
transition_map, p->value, p->slot, p->vector);
}
};
}
Node* smi_handler = HandleProtoHandler<StoreHandler>(
p, handler, on_code_handler,
// on_found_on_receiver
[=](Node* properties, Node* name_index) {
// TODO(ishell): combine with |found| case inside |if_store_normal|.
Node* details =
LoadDetailsByKeyIndex<NameDictionary>(properties, name_index);
// Check that the property is a writable data property (no accessor).
const int kTypeAndReadOnlyMask =
PropertyDetails::KindField::kMask |
PropertyDetails::kAttributesReadOnlyMask;
STATIC_ASSERT(kData == 0);
GotoIf(IsSetWord32(details, kTypeAndReadOnlyMask), miss);
StoreValueByKeyIndex<NameDictionary>(properties, name_index, p->value);
Return(p->value);
},
miss, ic_mode);
Label if_transition_map(this), if_holder_object(this);
Node* maybe_transition_or_holder_cell = LoadHandlerDataField(handler, 1);
Node* maybe_transition_or_holder =
LoadWeakCellValue(maybe_transition_or_holder_cell, miss);
Branch(IsMap(maybe_transition_or_holder), &if_transition_map,
&if_holder_object);
BIND(&if_transition_map);
{
Label if_transition_to_constant(this), if_store_normal(this);
Node* holder = p->receiver;
Node* transition_map = maybe_transition_or_holder;
GotoIf(IsDeprecatedMap(transition_map), miss);
Node* handler_word = SmiUntag(smi_handler);
Node* handler_kind = DecodeWord<StoreHandler::KindBits>(handler_word);
GotoIf(WordEqual(handler_kind, IntPtrConstant(StoreHandler::kNormal)),
&if_store_normal);
GotoIf(WordEqual(handler_kind,
IntPtrConstant(StoreHandler::kTransitionToConstant)),
&if_transition_to_constant);
CSA_ASSERT(this,
WordEqual(handler_kind,
IntPtrConstant(StoreHandler::kTransitionToField)));
// Handle transitioning field stores.
HandleStoreICSmiHandlerCase(handler_word, holder, p->value, transition_map,
miss);
BIND(&if_transition_to_constant);
{
// Check that constant matches value.
Node* descriptor = DecodeWord<StoreHandler::DescriptorBits>(handler_word);
Node* constant = LoadDescriptorValue(transition_map, descriptor);
GotoIf(WordNotEqual(p->value, constant), miss);
StoreMap(p->receiver, transition_map);
Return(p->value);
}
BIND(&if_store_normal);
{
Node* properties = LoadSlowProperties(p->receiver);
VARIABLE(var_name_index, MachineType::PointerRepresentation());
Label found(this, &var_name_index), not_found(this);
NameDictionaryLookup<NameDictionary>(properties, p->name, &found,
&var_name_index, &not_found);
BIND(&found);
{
Node* details = LoadDetailsByKeyIndex<NameDictionary>(
properties, var_name_index.value());
// Check that the property is a writable data property (no accessor).
const int kTypeAndReadOnlyMask =
PropertyDetails::KindField::kMask |
PropertyDetails::kAttributesReadOnlyMask;
STATIC_ASSERT(kData == 0);
GotoIf(IsSetWord32(details, kTypeAndReadOnlyMask), miss);
StoreValueByKeyIndex<NameDictionary>(properties, var_name_index.value(),
p->value);
Return(p->value);
}
BIND(&not_found);
{
Label slow(this);
Node* receiver_map = LoadMap(p->receiver);
InvalidateValidityCellIfPrototype(receiver_map);
Add<NameDictionary>(properties, p->name, p->value, &slow);
Return(p->value);
BIND(&slow);
TailCallRuntime(Runtime::kAddDictionaryProperty, p->context,
p->receiver, p->name, p->value);
}
}
}
BIND(&if_holder_object);
{
Label if_store_global_proxy(this), if_api_setter(this), if_accessor(this),
if_native_data_property(this);
Node* holder = maybe_transition_or_holder;
CSA_ASSERT(this, TaggedIsSmi(smi_handler));
Node* handler_word = SmiUntag(smi_handler);
Node* handler_kind = DecodeWord<StoreHandler::KindBits>(handler_word);
GotoIf(WordEqual(handler_kind, IntPtrConstant(StoreHandler::kGlobalProxy)),
&if_store_global_proxy);
GotoIf(WordEqual(handler_kind, IntPtrConstant(StoreHandler::kAccessor)),
&if_accessor);
GotoIf(WordEqual(handler_kind,
IntPtrConstant(StoreHandler::kNativeDataProperty)),
&if_native_data_property);
GotoIf(WordEqual(handler_kind, IntPtrConstant(StoreHandler::kApiSetter)),
&if_api_setter);
GotoIf(WordEqual(handler_kind,
IntPtrConstant(StoreHandler::kApiSetterHolderIsPrototype)),
&if_api_setter);
CSA_ASSERT(this,
WordEqual(handler_kind, IntPtrConstant(StoreHandler::kProxy)));
HandleStoreToProxy(p, holder, miss, support_elements);
BIND(&if_accessor);
HandleStoreAccessor(p, holder, handler_word);
BIND(&if_native_data_property);
HandleStoreICNativeDataProperty(p, holder, handler_word);
BIND(&if_api_setter);
{
Comment("api_setter");
CSA_ASSERT(this, TaggedIsNotSmi(handler));
Node* call_handler_info = holder;
// Context is stored either in data2 or data3 field depending on whether
// the access check is enabled for this handler or not.
Node* context_cell = Select(
IsSetWord<LoadHandler::DoAccessCheckOnReceiverBits>(handler_word),
[=] { return LoadHandlerDataField(handler, 3); },
[=] { return LoadHandlerDataField(handler, 2); },
MachineRepresentation::kTagged);
Node* context = LoadWeakCellValueUnchecked(context_cell);
Node* foreign = LoadObjectField(call_handler_info,
CallHandlerInfo::kJsCallbackOffset);
Node* callback = LoadObjectField(foreign, Foreign::kForeignAddressOffset,
MachineType::Pointer());
Node* data =
LoadObjectField(call_handler_info, CallHandlerInfo::kDataOffset);
VARIABLE(api_holder, MachineRepresentation::kTagged, p->receiver);
Label store(this);
GotoIf(WordEqual(handler_kind, IntPtrConstant(StoreHandler::kApiSetter)),
&store);
CSA_ASSERT(
this,
WordEqual(handler_kind,
IntPtrConstant(StoreHandler::kApiSetterHolderIsPrototype)));
api_holder.Bind(LoadMapPrototype(LoadMap(p->receiver)));
Goto(&store);
BIND(&store);
Callable callable = CodeFactory::CallApiCallback(isolate(), 1);
Return(CallStub(callable, nullptr, context, data, api_holder.value(),
callback, p->receiver, p->value));
}
BIND(&if_store_global_proxy);
{
ExitPoint direct_exit(this);
StoreGlobalIC_PropertyCellCase(holder, p->value, &direct_exit, miss);
}
}
}
Node* AccessorAssembler::GetLanguageMode(Node* vector, Node* slot) {
VARIABLE(var_language_mode, MachineRepresentation::kTaggedSigned,
SmiConstant(LanguageMode::kStrict));
Label language_mode_determined(this);
BranchIfStrictMode(vector, slot, &language_mode_determined);
var_language_mode.Bind(SmiConstant(LanguageMode::kSloppy));
Goto(&language_mode_determined);
BIND(&language_mode_determined);
return var_language_mode.value();
}
void AccessorAssembler::HandleStoreToProxy(const StoreICParameters* p,
Node* proxy, Label* miss,
ElementSupport support_elements) {
VARIABLE(var_index, MachineType::PointerRepresentation());
VARIABLE(var_unique, MachineRepresentation::kTagged);
Label if_index(this), if_unique_name(this),
to_name_failed(this, Label::kDeferred);
Node* language_mode = GetLanguageMode(p->vector, p->slot);
if (support_elements == kSupportElements) {
TryToName(p->name, &if_index, &var_index, &if_unique_name, &var_unique,
&to_name_failed);
BIND(&if_unique_name);
CallBuiltin(Builtins::kProxySetProperty, p->context, proxy,
var_unique.value(), p->value, p->receiver, language_mode);
Return(p->value);
// The index case is handled earlier by the runtime.
BIND(&if_index);
// TODO(mslekova): introduce TryToName that doesn't try to compute
// the intptr index value
Goto(&to_name_failed);
BIND(&to_name_failed);
TailCallRuntime(Runtime::kSetPropertyWithReceiver, p->context, proxy,
p->name, p->value, p->receiver, language_mode);
} else {
Node* name = ToName(p->context, p->name);
TailCallBuiltin(Builtins::kProxySetProperty, p->context, proxy, name,
p->value, p->receiver, language_mode);
}
}
void AccessorAssembler::HandleStoreICSmiHandlerCase(Node* handler_word,
Node* holder, Node* value,
Node* transition,
Label* miss) {
Comment(transition ? "transitioning field store" : "field store");
#ifdef DEBUG
Node* handler_kind = DecodeWord<StoreHandler::KindBits>(handler_word);
if (transition) {
CSA_ASSERT(
this,
Word32Or(
WordEqual(handler_kind,
IntPtrConstant(StoreHandler::kTransitionToField)),
WordEqual(handler_kind,
IntPtrConstant(StoreHandler::kTransitionToConstant))));
} else {
if (FLAG_track_constant_fields) {
CSA_ASSERT(
this, Word32Or(WordEqual(handler_kind,
IntPtrConstant(StoreHandler::kField)),
WordEqual(handler_kind,
IntPtrConstant(StoreHandler::kConstField))));
} else {
CSA_ASSERT(this,
WordEqual(handler_kind, IntPtrConstant(StoreHandler::kField)));
}
}
#endif
Node* field_representation =
DecodeWord<StoreHandler::FieldRepresentationBits>(handler_word);
Label if_smi_field(this), if_double_field(this), if_heap_object_field(this),
if_tagged_field(this);
GotoIf(WordEqual(field_representation, IntPtrConstant(StoreHandler::kTagged)),
&if_tagged_field);
GotoIf(WordEqual(field_representation,
IntPtrConstant(StoreHandler::kHeapObject)),
&if_heap_object_field);
GotoIf(WordEqual(field_representation, IntPtrConstant(StoreHandler::kDouble)),
&if_double_field);
CSA_ASSERT(this, WordEqual(field_representation,
IntPtrConstant(StoreHandler::kSmi)));
Goto(&if_smi_field);
BIND(&if_tagged_field);
{
Comment("store tagged field");
HandleStoreFieldAndReturn(handler_word, holder, Representation::Tagged(),
value, transition, miss);
}
BIND(&if_double_field);
{
Comment("store double field");
HandleStoreFieldAndReturn(handler_word, holder, Representation::Double(),
value, transition, miss);
}
BIND(&if_heap_object_field);
{
Comment("store heap object field");
HandleStoreFieldAndReturn(handler_word, holder,
Representation::HeapObject(), value, transition,
miss);
}
BIND(&if_smi_field);
{
Comment("store smi field");
HandleStoreFieldAndReturn(handler_word, holder, Representation::Smi(),
value, transition, miss);
}
}
void AccessorAssembler::HandleStoreFieldAndReturn(Node* handler_word,
Node* holder,
Representation representation,
Node* value, Node* transition,
Label* miss) {
bool transition_to_field = transition != nullptr;
Node* prepared_value = PrepareValueForStore(
handler_word, holder, representation, transition, value, miss);
Label if_inobject(this), if_out_of_object(this);
Branch(IsSetWord<StoreHandler::IsInobjectBits>(handler_word), &if_inobject,
&if_out_of_object);
BIND(&if_inobject);
{
StoreNamedField(handler_word, holder, true, representation, prepared_value,
transition_to_field, miss);
if (transition_to_field) {
StoreMap(holder, transition);
}
Return(value);
}
BIND(&if_out_of_object);
{
if (transition_to_field) {
ExtendPropertiesBackingStore(holder, handler_word);
}
StoreNamedField(handler_word, holder, false, representation, prepared_value,
transition_to_field, miss);
if (transition_to_field) {
StoreMap(holder, transition);
}
Return(value);
}
}
Node* AccessorAssembler::PrepareValueForStore(Node* handler_word, Node* holder,
Representation representation,
Node* transition, Node* value,
Label* bailout) {
if (representation.IsDouble()) {
value = TryTaggedToFloat64(value, bailout);
} else if (representation.IsHeapObject()) {
GotoIf(TaggedIsSmi(value), bailout);
Label done(this);
if (FLAG_track_constant_fields && !transition) {
// Skip field type check in favor of constant value check when storing
// to constant field.
GotoIf(WordEqual(DecodeWord<StoreHandler::KindBits>(handler_word),
IntPtrConstant(StoreHandler::kConstField)),
&done);
}
Node* descriptor = DecodeWord<StoreHandler::DescriptorBits>(handler_word);
Node* maybe_field_type = LoadDescriptorValue(
transition ? transition : LoadMap(holder), descriptor);
GotoIf(TaggedIsSmi(maybe_field_type), &done);
// Check that value type matches the field type.
{
Node* field_type = LoadWeakCellValue(maybe_field_type, bailout);
Branch(WordEqual(LoadMap(value), field_type), &done, bailout);
}
BIND(&done);
} else if (representation.IsSmi()) {
GotoIfNot(TaggedIsSmi(value), bailout);
} else {
DCHECK(representation.IsTagged());
}
return value;
}
void AccessorAssembler::ExtendPropertiesBackingStore(Node* object,
Node* handler_word) {
Label done(this);
GotoIfNot(IsSetWord<StoreHandler::ExtendStorageBits>(handler_word), &done);
Comment("[ Extend storage");
ParameterMode mode = OptimalParameterMode();
// TODO(gsathya): Clean up the type conversions by creating smarter
// helpers that do the correct op based on the mode.
VARIABLE(var_properties, MachineRepresentation::kTaggedPointer);
VARIABLE(var_encoded_hash, MachineRepresentation::kWord32);
VARIABLE(var_length, ParameterRepresentation(mode));
Node* properties = LoadObjectField(object, JSObject::kPropertiesOrHashOffset);
var_properties.Bind(properties);
Label if_smi_hash(this), if_property_array(this), extend_store(this);
Branch(TaggedIsSmi(properties), &if_smi_hash, &if_property_array);
BIND(&if_smi_hash);
{
Node* hash = SmiToWord32(properties);
Node* encoded_hash =
Word32Shl(hash, Int32Constant(PropertyArray::HashField::kShift));
var_encoded_hash.Bind(encoded_hash);
var_length.Bind(IntPtrOrSmiConstant(0, mode));
var_properties.Bind(EmptyFixedArrayConstant());
Goto(&extend_store);
}
BIND(&if_property_array);
{
Node* length_and_hash_int32 = LoadAndUntagToWord32ObjectField(
var_properties.value(), PropertyArray::kLengthAndHashOffset);
var_encoded_hash.Bind(Word32And(
length_and_hash_int32, Int32Constant(PropertyArray::HashField::kMask)));
Node* length_intptr = ChangeInt32ToIntPtr(
Word32And(length_and_hash_int32,
Int32Constant(PropertyArray::LengthField::kMask)));
Node* length = WordToParameter(length_intptr, mode);
var_length.Bind(length);
Goto(&extend_store);
}
BIND(&extend_store);
{
// Previous property deletion could have left behind unused backing store
// capacity even for a map that think it doesn't have any unused fields.
// Perform a bounds check to see if we actually have to grow the array.
Node* index = DecodeWord<StoreHandler::FieldIndexBits>(handler_word);
Node* offset = IntPtrMul(index, IntPtrConstant(kPointerSize));
Node* size = ElementOffsetFromIndex(var_length.value(), PACKED_ELEMENTS,
mode, FixedArray::kHeaderSize);
GotoIf(UintPtrLessThan(offset, size), &done);
Node* delta = IntPtrOrSmiConstant(JSObject::kFieldsAdded, mode);
Node* new_capacity = IntPtrOrSmiAdd(var_length.value(), delta, mode);
// Grow properties array.
DCHECK(kMaxNumberOfDescriptors + JSObject::kFieldsAdded <
FixedArrayBase::GetMaxLengthForNewSpaceAllocation(PACKED_ELEMENTS));
// The size of a new properties backing store is guaranteed to be small
// enough that the new backing store will be allocated in new space.
CSA_ASSERT(this,
UintPtrOrSmiLessThan(
new_capacity,
IntPtrOrSmiConstant(
kMaxNumberOfDescriptors + JSObject::kFieldsAdded, mode),
mode));
Node* new_properties = AllocatePropertyArray(new_capacity, mode);
FillPropertyArrayWithUndefined(new_properties, var_length.value(),
new_capacity, mode);
// |new_properties| is guaranteed to be in new space, so we can skip
// the write barrier.
CopyPropertyArrayValues(var_properties.value(), new_properties,
var_length.value(), SKIP_WRITE_BARRIER, mode);
// TODO(gsathya): Clean up the type conversions by creating smarter
// helpers that do the correct op based on the mode.
Node* new_capacity_int32 =
TruncateWordToWord32(ParameterToWord(new_capacity, mode));
Node* new_length_and_hash_int32 =
Word32Or(var_encoded_hash.value(), new_capacity_int32);
StoreObjectField(new_properties, PropertyArray::kLengthAndHashOffset,
SmiFromWord32(new_length_and_hash_int32));
StoreObjectField(object, JSObject::kPropertiesOrHashOffset, new_properties);
Comment("] Extend storage");
Goto(&done);
}
BIND(&done);
}
void AccessorAssembler::StoreNamedField(Node* handler_word, Node* object,
bool is_inobject,
Representation representation,
Node* value, bool transition_to_field,
Label* bailout) {
bool store_value_as_double = representation.IsDouble();
Node* property_storage = object;
if (!is_inobject) {
property_storage = LoadFastProperties(object);
}
Node* index = DecodeWord<StoreHandler::FieldIndexBits>(handler_word);
Node* offset = IntPtrMul(index, IntPtrConstant(kPointerSize));
if (representation.IsDouble()) {
if (!FLAG_unbox_double_fields || !is_inobject) {
if (transition_to_field) {
Node* heap_number = AllocateHeapNumberWithValue(value, MUTABLE);
// Store the new mutable heap number into the object.
value = heap_number;
store_value_as_double = false;
} else {
// Load the heap number.
property_storage = LoadObjectField(property_storage, offset);
// Store the double value into it.
offset = IntPtrConstant(HeapNumber::kValueOffset);
}
}
}
// Do constant value check if necessary.
if (FLAG_track_constant_fields && !transition_to_field) {
Label done(this);
GotoIfNot(WordEqual(DecodeWord<StoreHandler::KindBits>(handler_word),
IntPtrConstant(StoreHandler::kConstField)),
&done);
{
if (store_value_as_double) {
Node* current_value =
LoadObjectField(property_storage, offset, MachineType::Float64());
GotoIfNot(Float64Equal(current_value, value), bailout);
} else {
Node* current_value = LoadObjectField(property_storage, offset);
GotoIfNot(WordEqual(current_value, value), bailout);
}
Goto(&done);
}
BIND(&done);
}
// Do the store.
if (store_value_as_double) {
StoreObjectFieldNoWriteBarrier(property_storage, offset, value,
MachineRepresentation::kFloat64);
} else if (representation.IsSmi()) {
StoreObjectFieldNoWriteBarrier(property_storage, offset, value);
} else {
StoreObjectField(property_storage, offset, value);
}
}
void AccessorAssembler::EmitFastElementsBoundsCheck(Node* object,
Node* elements,
Node* intptr_index,
Node* is_jsarray_condition,
Label* miss) {
VARIABLE(var_length, MachineType::PointerRepresentation());
Comment("Fast elements bounds check");
Label if_array(this), length_loaded(this, &var_length);
GotoIf(is_jsarray_condition, &if_array);
{
var_length.Bind(SmiUntag(LoadFixedArrayBaseLength(elements)));
Goto(&length_loaded);
}
BIND(&if_array);
{
var_length.Bind(SmiUntag(LoadFastJSArrayLength(object)));
Goto(&length_loaded);
}
BIND(&length_loaded);
GotoIfNot(UintPtrLessThan(intptr_index, var_length.value()), miss);
}
void AccessorAssembler::EmitElementLoad(
Node* object, Node* elements, Node* elements_kind, Node* intptr_index,
Node* is_jsarray_condition, Label* if_hole, Label* rebox_double,
Variable* var_double_value, Label* unimplemented_elements_kind,
Label* out_of_bounds, Label* miss, ExitPoint* exit_point) {
Label if_typed_array(this), if_fast_packed(this), if_fast_holey(this),
if_fast_double(this), if_fast_holey_double(this), if_nonfast(this),
if_dictionary(this);
GotoIf(
Int32GreaterThan(elements_kind, Int32Constant(LAST_FAST_ELEMENTS_KIND)),
&if_nonfast);
EmitFastElementsBoundsCheck(object, elements, intptr_index,
is_jsarray_condition, out_of_bounds);
int32_t kinds[] = {// Handled by if_fast_packed.
PACKED_SMI_ELEMENTS, PACKED_ELEMENTS,
// Handled by if_fast_holey.
HOLEY_SMI_ELEMENTS, HOLEY_ELEMENTS,
// Handled by if_fast_double.
PACKED_DOUBLE_ELEMENTS,
// Handled by if_fast_holey_double.
HOLEY_DOUBLE_ELEMENTS};
Label* labels[] = {// FAST_{SMI,}_ELEMENTS
&if_fast_packed, &if_fast_packed,
// FAST_HOLEY_{SMI,}_ELEMENTS
&if_fast_holey, &if_fast_holey,
// PACKED_DOUBLE_ELEMENTS
&if_fast_double,
// HOLEY_DOUBLE_ELEMENTS
&if_fast_holey_double};
Switch(elements_kind, unimplemented_elements_kind, kinds, labels,
arraysize(kinds));
BIND(&if_fast_packed);
{
Comment("fast packed elements");
exit_point->Return(LoadFixedArrayElement(elements, intptr_index));
}
BIND(&if_fast_holey);
{
Comment("fast holey elements");
Node* element = LoadFixedArrayElement(elements, intptr_index);
GotoIf(WordEqual(element, TheHoleConstant()), if_hole);
exit_point->Return(element);
}
BIND(&if_fast_double);
{
Comment("packed double elements");
var_double_value->Bind(LoadFixedDoubleArrayElement(elements, intptr_index,
MachineType::Float64()));
Goto(rebox_double);
}
BIND(&if_fast_holey_double);
{
Comment("holey double elements");
Node* value = LoadFixedDoubleArrayElement(elements, intptr_index,
MachineType::Float64(), 0,
INTPTR_PARAMETERS, if_hole);
var_double_value->Bind(value);
Goto(rebox_double);
}
BIND(&if_nonfast);
{
STATIC_ASSERT(LAST_ELEMENTS_KIND == LAST_FIXED_TYPED_ARRAY_ELEMENTS_KIND);
GotoIf(Int32GreaterThanOrEqual(
elements_kind,
Int32Constant(FIRST_FIXED_TYPED_ARRAY_ELEMENTS_KIND)),
&if_typed_array);
GotoIf(Word32Equal(elements_kind, Int32Constant(DICTIONARY_ELEMENTS)),
&if_dictionary);
Goto(unimplemented_elements_kind);
}
BIND(&if_dictionary);
{
Comment("dictionary elements");
GotoIf(IntPtrLessThan(intptr_index, IntPtrConstant(0)), out_of_bounds);
VARIABLE(var_entry, MachineType::PointerRepresentation());
Label if_found(this);
NumberDictionaryLookup(elements, intptr_index, &if_found, &var_entry,
if_hole);
BIND(&if_found);
// Check that the value is a data property.
Node* index = EntryToIndex<NumberDictionary>(var_entry.value());
Node* details = LoadDetailsByKeyIndex<NumberDictionary>(elements, index);
Node* kind = DecodeWord32<PropertyDetails::KindField>(details);
// TODO(jkummerow): Support accessors without missing?
GotoIfNot(Word32Equal(kind, Int32Constant(kData)), miss);
// Finally, load the value.
exit_point->Return(LoadValueByKeyIndex<NumberDictionary>(elements, index));
}
BIND(&if_typed_array);
{
Comment("typed elements");
// Check if buffer has been neutered.
Node* buffer = LoadObjectField(object, JSArrayBufferView::kBufferOffset);
GotoIf(IsDetachedBuffer(buffer), miss);
// Bounds check.
Node* length =
SmiUntag(CAST(LoadObjectField(object, JSTypedArray::kLengthOffset)));
GotoIfNot(UintPtrLessThan(intptr_index, length), out_of_bounds);
// Backing store = external_pointer + base_pointer.
Node* external_pointer =
LoadObjectField(elements, FixedTypedArrayBase::kExternalPointerOffset,
MachineType::Pointer());
Node* base_pointer =
LoadObjectField(elements, FixedTypedArrayBase::kBasePointerOffset);
Node* backing_store =
IntPtrAdd(external_pointer, BitcastTaggedToWord(base_pointer));
Label uint8_elements(this), int8_elements(this), uint16_elements(this),
int16_elements(this), uint32_elements(this), int32_elements(this),
float32_elements(this), float64_elements(this);
Label* elements_kind_labels[] = {
&uint8_elements, &uint8_elements, &int8_elements,
&uint16_elements, &int16_elements, &uint32_elements,
&int32_elements, &float32_elements, &float64_elements};
int32_t elements_kinds[] = {
UINT8_ELEMENTS, UINT8_CLAMPED_ELEMENTS, INT8_ELEMENTS,
UINT16_ELEMENTS, INT16_ELEMENTS, UINT32_ELEMENTS,
INT32_ELEMENTS, FLOAT32_ELEMENTS, FLOAT64_ELEMENTS};
const size_t kTypedElementsKindCount =
LAST_FIXED_TYPED_ARRAY_ELEMENTS_KIND -
FIRST_FIXED_TYPED_ARRAY_ELEMENTS_KIND + 1;
DCHECK_EQ(kTypedElementsKindCount, arraysize(elements_kinds));
DCHECK_EQ(kTypedElementsKindCount, arraysize(elements_kind_labels));
Switch(elements_kind, miss, elements_kinds, elements_kind_labels,
kTypedElementsKindCount);
BIND(&uint8_elements);
{
Comment("UINT8_ELEMENTS"); // Handles UINT8_CLAMPED_ELEMENTS too.
Node* element = Load(MachineType::Uint8(), backing_store, intptr_index);
exit_point->Return(SmiFromWord32(element));
}
BIND(&int8_elements);
{
Comment("INT8_ELEMENTS");
Node* element = Load(MachineType::Int8(), backing_store, intptr_index);
exit_point->Return(SmiFromWord32(element));
}
BIND(&uint16_elements);
{
Comment("UINT16_ELEMENTS");
Node* index = WordShl(intptr_index, IntPtrConstant(1));
Node* element = Load(MachineType::Uint16(), backing_store, index);
exit_point->Return(SmiFromWord32(element));
}
BIND(&int16_elements);
{
Comment("INT16_ELEMENTS");
Node* index = WordShl(intptr_index, IntPtrConstant(1));
Node* element = Load(MachineType::Int16(), backing_store, index);
exit_point->Return(SmiFromWord32(element));
}
BIND(&uint32_elements);
{
Comment("UINT32_ELEMENTS");
Node* index = WordShl(intptr_index, IntPtrConstant(2));
Node* element = Load(MachineType::Uint32(), backing_store, index);
exit_point->Return(ChangeUint32ToTagged(element));
}
BIND(&int32_elements);
{
Comment("INT32_ELEMENTS");
Node* index = WordShl(intptr_index, IntPtrConstant(2));
Node* element = Load(MachineType::Int32(), backing_store, index);
exit_point->Return(ChangeInt32ToTagged(element));
}
BIND(&float32_elements);
{
Comment("FLOAT32_ELEMENTS");
Node* index = WordShl(intptr_index, IntPtrConstant(2));
Node* element = Load(MachineType::Float32(), backing_store, index);
var_double_value->Bind(ChangeFloat32ToFloat64(element));
Goto(rebox_double);
}
BIND(&float64_elements);
{
Comment("FLOAT64_ELEMENTS");
Node* index = WordShl(intptr_index, IntPtrConstant(3));
Node* element = Load(MachineType::Float64(), backing_store, index);
var_double_value->Bind(element);
Goto(rebox_double);
}
}
}
void AccessorAssembler::NameDictionaryNegativeLookup(Node* object, Node* name,
Label* miss) {
CSA_ASSERT(this, IsDictionaryMap(LoadMap(object)));
Node* properties = LoadSlowProperties(object);
// Ensure the property does not exist in a dictionary-mode object.
VARIABLE(var_name_index, MachineType::PointerRepresentation());
Label done(this);
NameDictionaryLookup<NameDictionary>(properties, name, miss, &var_name_index,
&done);
BIND(&done);
}
void AccessorAssembler::BranchIfStrictMode(Node* vector, Node* slot,
Label* if_strict) {
Node* sfi =
LoadObjectField(vector, FeedbackVector::kSharedFunctionInfoOffset);
Node* metadata =
LoadObjectField(sfi, SharedFunctionInfo::kFeedbackMetadataOffset);
Node* slot_int = SmiToWord32(slot);
// See VectorICComputer::index().
const int kItemsPerWord = FeedbackMetadata::VectorICComputer::kItemsPerWord;
Node* word_index = Int32Div(slot_int, Int32Constant(kItemsPerWord));
Node* word_offset = Int32Mod(slot_int, Int32Constant(kItemsPerWord));
Node* data = SmiToWord32(LoadFixedArrayElement(
metadata, ChangeInt32ToIntPtr(word_index),
FeedbackMetadata::kReservedIndexCount * kPointerSize, INTPTR_PARAMETERS));
// See VectorICComputer::decode().
const int kBitsPerItem = FeedbackMetadata::kFeedbackSlotKindBits;
Node* shift = Int32Mul(word_offset, Int32Constant(kBitsPerItem));
const int kMask = FeedbackMetadata::VectorICComputer::kMask;
Node* kind = Word32And(Word32Shr(data, shift), Int32Constant(kMask));
STATIC_ASSERT(FeedbackSlotKind::kStoreGlobalSloppy <=
FeedbackSlotKind::kLastSloppyKind);
STATIC_ASSERT(FeedbackSlotKind::kStoreKeyedSloppy <=
FeedbackSlotKind::kLastSloppyKind);
STATIC_ASSERT(FeedbackSlotKind::kStoreNamedSloppy <=
FeedbackSlotKind::kLastSloppyKind);
GotoIfNot(Int32LessThanOrEqual(kind, Int32Constant(static_cast<int>(
FeedbackSlotKind::kLastSloppyKind))),
if_strict);
}
void AccessorAssembler::InvalidateValidityCellIfPrototype(Node* map,
Node* bitfield2) {
Label is_prototype(this), cont(this);
if (bitfield2 == nullptr) {
bitfield2 = LoadMapBitField2(map);
}
Branch(IsSetWord32(bitfield2, Map::IsPrototypeMapBit::kMask), &is_prototype,
&cont);
BIND(&is_prototype);
{
Node* maybe_prototype_info =
LoadObjectField(map, Map::kTransitionsOrPrototypeInfoOffset);
// If there's no prototype info then there's nothing to invalidate.
GotoIf(TaggedIsSmi(maybe_prototype_info), &cont);
Node* function = ExternalConstant(
ExternalReference::invalidate_prototype_chains_function(isolate()));
CallCFunction1(MachineType::AnyTagged(), MachineType::AnyTagged(), function,
map);
Goto(&cont);
}
BIND(&cont);
}
void AccessorAssembler::GenericElementLoad(Node* receiver, Node* receiver_map,
Node* instance_type, Node* index,
Label* slow) {
Comment("integer index");
ExitPoint direct_exit(this);
Label if_custom(this), if_element_hole(this), if_oob(this);
// Receivers requiring non-standard element accesses (interceptors, access
// checks, strings and string wrappers, proxies) are handled in the runtime.
GotoIf(Int32LessThanOrEqual(instance_type,
Int32Constant(LAST_CUSTOM_ELEMENTS_RECEIVER)),
&if_custom);
Node* elements = LoadElements(receiver);
Node* elements_kind = LoadMapElementsKind(receiver_map);
Node* is_jsarray_condition = InstanceTypeEqual(instance_type, JS_ARRAY_TYPE);
VARIABLE(var_double_value, MachineRepresentation::kFloat64);
Label rebox_double(this, &var_double_value);
// Unimplemented elements kinds fall back to a runtime call.
Label* unimplemented_elements_kind = slow;
IncrementCounter(isolate()->counters()->ic_keyed_load_generic_smi(), 1);
EmitElementLoad(receiver, elements, elements_kind, index,
is_jsarray_condition, &if_element_hole, &rebox_double,
&var_double_value, unimplemented_elements_kind, &if_oob, slow,
&direct_exit);
BIND(&rebox_double);
Return(AllocateHeapNumberWithValue(var_double_value.value()));
BIND(&if_oob);
{
Comment("out of bounds");
// Negative keys can't take the fast OOB path.
GotoIf(IntPtrLessThan(index, IntPtrConstant(0)), slow);
// Positive OOB indices are effectively the same as hole loads.
Goto(&if_element_hole);
}
BIND(&if_element_hole);
{
Comment("found the hole");
Label return_undefined(this);
BranchIfPrototypesHaveNoElements(receiver_map, &return_undefined, slow);
BIND(&return_undefined);
Return(UndefinedConstant());
}
BIND(&if_custom);
{
Comment("check if string");
GotoIfNot(IsStringInstanceType(instance_type), slow);
Comment("load string character");
Node* length = LoadAndUntagObjectField(receiver, String::kLengthOffset);
GotoIfNot(UintPtrLessThan(index, length), slow);
IncrementCounter(isolate()->counters()->ic_keyed_load_generic_smi(), 1);
TailCallBuiltin(Builtins::kStringCharAt, NoContextConstant(), receiver,
index);
}
}
void AccessorAssembler::GenericPropertyLoad(Node* receiver, Node* receiver_map,
Node* instance_type,
const LoadICParameters* p,
Label* slow,
UseStubCache use_stub_cache) {
ExitPoint direct_exit(this);
Comment("key is unique name");
Label if_found_on_receiver(this), if_property_dictionary(this),
lookup_prototype_chain(this), special_receiver(this);
VARIABLE(var_details, MachineRepresentation::kWord32);
VARIABLE(var_value, MachineRepresentation::kTagged);
// Receivers requiring non-standard accesses (interceptors, access
// checks, strings and string wrappers) are handled in the runtime.
GotoIf(Int32LessThanOrEqual(instance_type,
Int32Constant(LAST_SPECIAL_RECEIVER_TYPE)),
&special_receiver);
// Check if the receiver has fast or slow properties.
Node* bitfield3 = LoadMapBitField3(receiver_map);
GotoIf(IsSetWord32<Map::IsDictionaryMapBit>(bitfield3),
&if_property_dictionary);
// Try looking up the property on the receiver; if unsuccessful, look
// for a handler in the stub cache.
Node* descriptors = LoadMapDescriptors(receiver_map);
Label if_descriptor_found(this), stub_cache(this);
VARIABLE(var_name_index, MachineType::PointerRepresentation());
Label* notfound =
use_stub_cache == kUseStubCache ? &stub_cache : &lookup_prototype_chain;
DescriptorLookup(p->name, descriptors, bitfield3, &if_descriptor_found,
&var_name_index, notfound);
BIND(&if_descriptor_found);
{
LoadPropertyFromFastObject(receiver, receiver_map, descriptors,
var_name_index.value(), &var_details,
&var_value);
Goto(&if_found_on_receiver);
}
if (use_stub_cache == kUseStubCache) {
BIND(&stub_cache);
Comment("stub cache probe for fast property load");
VARIABLE(var_handler, MachineRepresentation::kTagged);
Label found_handler(this, &var_handler), stub_cache_miss(this);
TryProbeStubCache(isolate()->load_stub_cache(), receiver, p->name,
&found_handler, &var_handler, &stub_cache_miss);
BIND(&found_handler);
{
HandleLoadICHandlerCase(p, var_handler.value(), &stub_cache_miss,
&direct_exit);
}
BIND(&stub_cache_miss);
{
// TODO(jkummerow): Check if the property exists on the prototype
// chain. If it doesn't, then there's no point in missing.
Comment("KeyedLoadGeneric_miss");
TailCallRuntime(Runtime::kKeyedLoadIC_Miss, p->context, p->receiver,
p->name, p->slot, p->vector);
}
}
BIND(&if_property_dictionary);
{
Comment("dictionary property load");
// We checked for LAST_CUSTOM_ELEMENTS_RECEIVER before, which rules out
// seeing global objects here (which would need special handling).
VARIABLE(var_name_index, MachineType::PointerRepresentation());
Label dictionary_found(this, &var_name_index);
Node* properties = LoadSlowProperties(receiver);
NameDictionaryLookup<NameDictionary>(properties, p->name, &dictionary_found,
&var_name_index,
&lookup_prototype_chain);
BIND(&dictionary_found);
{
LoadPropertyFromNameDictionary(properties, var_name_index.value(),
&var_details, &var_value);
Goto(&if_found_on_receiver);
}
}
BIND(&if_found_on_receiver);
{
Node* value = CallGetterIfAccessor(var_value.value(), var_details.value(),
p->context, receiver, slow);
IncrementCounter(isolate()->counters()->ic_keyed_load_generic_symbol(), 1);
Return(value);
}
BIND(&lookup_prototype_chain);
{
VARIABLE(var_holder_map, MachineRepresentation::kTagged);
VARIABLE(var_holder_instance_type, MachineRepresentation::kWord32);
Label return_undefined(this);
Variable* merged_variables[] = {&var_holder_map, &var_holder_instance_type};
Label loop(this, arraysize(merged_variables), merged_variables);
var_holder_map.Bind(receiver_map);
var_holder_instance_type.Bind(instance_type);
// Private symbols must not be looked up on the prototype chain.
GotoIf(IsPrivateSymbol(p->name), &return_undefined);
Goto(&loop);
BIND(&loop);
{
// Bailout if it can be an integer indexed exotic case.
GotoIf(InstanceTypeEqual(var_holder_instance_type.value(),
JS_TYPED_ARRAY_TYPE),
slow);
Node* proto = LoadMapPrototype(var_holder_map.value());
GotoIf(WordEqual(proto, NullConstant()), &return_undefined);
Node* proto_map = LoadMap(proto);
Node* proto_instance_type = LoadMapInstanceType(proto_map);
var_holder_map.Bind(proto_map);
var_holder_instance_type.Bind(proto_instance_type);
Label next_proto(this), return_value(this, &var_value), goto_slow(this);
TryGetOwnProperty(p->context, receiver, proto, proto_map,
proto_instance_type, p->name, &return_value, &var_value,
&next_proto, &goto_slow);
// This trampoline and the next are required to appease Turbofan's
// variable merging.
BIND(&next_proto);
Goto(&loop);
BIND(&goto_slow);
Goto(slow);
BIND(&return_value);
Return(var_value.value());
}
BIND(&return_undefined);
Return(UndefinedConstant());
}
BIND(&special_receiver);
{
// TODO(jkummerow): Consider supporting JSModuleNamespace.
GotoIfNot(InstanceTypeEqual(instance_type, JS_PROXY_TYPE), slow);
direct_exit.ReturnCallStub(
Builtins::CallableFor(isolate(), Builtins::kProxyGetProperty),
p->context, receiver /*holder is the same as receiver*/, p->name,
receiver);
}
}
//////////////////// Stub cache access helpers.
enum AccessorAssembler::StubCacheTable : int {
kPrimary = static_cast<int>(StubCache::kPrimary),
kSecondary = static_cast<int>(StubCache::kSecondary)
};
Node* AccessorAssembler::StubCachePrimaryOffset(Node* name, Node* map) {
// See v8::internal::StubCache::PrimaryOffset().
STATIC_ASSERT(StubCache::kCacheIndexShift == Name::kHashShift);
// Compute the hash of the name (use entire hash field).
Node* hash_field = LoadNameHashField(name);
CSA_ASSERT(this,
Word32Equal(Word32And(hash_field,
Int32Constant(Name::kHashNotComputedMask)),
Int32Constant(0)));
// Using only the low bits in 64-bit mode is unlikely to increase the
// risk of collision even if the heap is spread over an area larger than
// 4Gb (and not at all if it isn't).
Node* map32 = TruncateWordToWord32(BitcastTaggedToWord(map));
// Base the offset on a simple combination of name and map.
Node* hash = Int32Add(hash_field, map32);
uint32_t mask = (StubCache::kPrimaryTableSize - 1)
<< StubCache::kCacheIndexShift;
return ChangeUint32ToWord(Word32And(hash, Int32Constant(mask)));
}
Node* AccessorAssembler::StubCacheSecondaryOffset(Node* name, Node* seed) {
// See v8::internal::StubCache::SecondaryOffset().
// Use the seed from the primary cache in the secondary cache.
Node* name32 = TruncateWordToWord32(BitcastTaggedToWord(name));
Node* hash = Int32Sub(TruncateWordToWord32(seed), name32);
hash = Int32Add(hash, Int32Constant(StubCache::kSecondaryMagic));
int32_t mask = (StubCache::kSecondaryTableSize - 1)
<< StubCache::kCacheIndexShift;
return ChangeUint32ToWord(Word32And(hash, Int32Constant(mask)));
}
void AccessorAssembler::TryProbeStubCacheTable(StubCache* stub_cache,
StubCacheTable table_id,
Node* entry_offset, Node* name,
Node* map, Label* if_handler,
Variable* var_handler,
Label* if_miss) {
StubCache::Table table = static_cast<StubCache::Table>(table_id);
#ifdef DEBUG
if (FLAG_test_secondary_stub_cache && table == StubCache::kPrimary) {
Goto(if_miss);
return;
} else if (FLAG_test_primary_stub_cache && table == StubCache::kSecondary) {
Goto(if_miss);
return;
}
#endif
// The {table_offset} holds the entry offset times four (due to masking
// and shifting optimizations).
const int kMultiplier = sizeof(StubCache::Entry) >> Name::kHashShift;
entry_offset = IntPtrMul(entry_offset, IntPtrConstant(kMultiplier));
// Check that the key in the entry matches the name.
Node* key_base =
ExternalConstant(ExternalReference(stub_cache->key_reference(table)));
Node* entry_key = Load(MachineType::Pointer(), key_base, entry_offset);
GotoIf(WordNotEqual(name, entry_key), if_miss);
// Get the map entry from the cache.
DCHECK_EQ(kPointerSize * 2, stub_cache->map_reference(table).address() -
stub_cache->key_reference(table).address());
Node* entry_map =
Load(MachineType::Pointer(), key_base,
IntPtrAdd(entry_offset, IntPtrConstant(kPointerSize * 2)));
GotoIf(WordNotEqual(map, entry_map), if_miss);
DCHECK_EQ(kPointerSize, stub_cache->value_reference(table).address() -
stub_cache->key_reference(table).address());
Node* handler = Load(MachineType::TaggedPointer(), key_base,
IntPtrAdd(entry_offset, IntPtrConstant(kPointerSize)));
// We found the handler.
var_handler->Bind(handler);
Goto(if_handler);
}
void AccessorAssembler::TryProbeStubCache(StubCache* stub_cache, Node* receiver,
Node* name, Label* if_handler,
Variable* var_handler,
Label* if_miss) {
Label try_secondary(this), miss(this);
Counters* counters = isolate()->counters();
IncrementCounter(counters->megamorphic_stub_cache_probes(), 1);
// Check that the {receiver} isn't a smi.
GotoIf(TaggedIsSmi(receiver), &miss);
Node* receiver_map = LoadMap(receiver);
// Probe the primary table.
Node* primary_offset = StubCachePrimaryOffset(name, receiver_map);
TryProbeStubCacheTable(stub_cache, kPrimary, primary_offset, name,
receiver_map, if_handler, var_handler, &try_secondary);
BIND(&try_secondary);
{
// Probe the secondary table.
Node* secondary_offset = StubCacheSecondaryOffset(name, primary_offset);
TryProbeStubCacheTable(stub_cache, kSecondary, secondary_offset, name,
receiver_map, if_handler, var_handler, &miss);
}
BIND(&miss);
{
IncrementCounter(counters->megamorphic_stub_cache_misses(), 1);
Goto(if_miss);
}
}
//////////////////// Entry points into private implementation (one per stub).
void AccessorAssembler::LoadIC_BytecodeHandler(const LoadICParameters* p,
ExitPoint* exit_point) {
// Must be kept in sync with LoadIC.
// This function is hand-tuned to omit frame construction for common cases,
// e.g.: monomorphic field and constant loads through smi handlers.
// Polymorphic ICs with a hit in the first two entries also omit frames.
// TODO(jgruber): Frame omission is fragile and can be affected by minor
// changes in control flow and logic. We currently have no way of ensuring
// that no frame is constructed, so it's easy to break this optimization by
// accident.
Label stub_call(this, Label::kDeferred), miss(this, Label::kDeferred);
// Inlined fast path.
{
Comment("LoadIC_BytecodeHandler_fast");
Node* recv_map = LoadReceiverMap(p->receiver);
GotoIf(IsDeprecatedMap(recv_map), &miss);
VARIABLE(var_handler, MachineRepresentation::kTagged);
Label try_polymorphic(this), if_handler(this, &var_handler);
Node* feedback =
TryMonomorphicCase(p->slot, p->vector, recv_map, &if_handler,
&var_handler, &try_polymorphic);
BIND(&if_handler);
HandleLoadICHandlerCase(p, var_handler.value(), &miss, exit_point);
BIND(&try_polymorphic);
{
GotoIfNot(WordEqual(LoadMap(feedback), FixedArrayMapConstant()),
&stub_call);
HandlePolymorphicCase(recv_map, feedback, &if_handler, &var_handler,
&miss, 2);
}
}
BIND(&stub_call);
{
Comment("LoadIC_BytecodeHandler_noninlined");
// Call into the stub that implements the non-inlined parts of LoadIC.
Callable ic =
Builtins::CallableFor(isolate(), Builtins::kLoadIC_Noninlined);
Node* code_target = HeapConstant(ic.code());
exit_point->ReturnCallStub(ic.descriptor(), code_target, p->context,
p->receiver, p->name, p->slot, p->vector);
}
BIND(&miss);
{
Comment("LoadIC_BytecodeHandler_miss");
exit_point->ReturnCallRuntime(Runtime::kLoadIC_Miss, p->context,
p->receiver, p->name, p->slot, p->vector);
}
}
void AccessorAssembler::LoadIC(const LoadICParameters* p) {
// Must be kept in sync with LoadIC_BytecodeHandler.
ExitPoint direct_exit(this);
VARIABLE(var_handler, MachineRepresentation::kTagged);
Label if_handler(this, &var_handler), non_inlined(this, Label::kDeferred),
try_polymorphic(this), miss(this, Label::kDeferred);
Node* receiver_map = LoadReceiverMap(p->receiver);
GotoIf(IsDeprecatedMap(receiver_map), &miss);
// Check monomorphic case.
Node* feedback =
TryMonomorphicCase(p->slot, p->vector, receiver_map, &if_handler,
&var_handler, &try_polymorphic);
BIND(&if_handler);
HandleLoadICHandlerCase(p, var_handler.value(), &miss, &direct_exit);
BIND(&try_polymorphic);
{
// Check polymorphic case.
Comment("LoadIC_try_polymorphic");
GotoIfNot(WordEqual(LoadMap(feedback), FixedArrayMapConstant()),
&non_inlined);
HandlePolymorphicCase(receiver_map, feedback, &if_handler, &var_handler,
&miss, 2);
}
BIND(&non_inlined);
LoadIC_Noninlined(p, receiver_map, feedback, &var_handler, &if_handler, &miss,
&direct_exit);
BIND(&miss);
direct_exit.ReturnCallRuntime(Runtime::kLoadIC_Miss, p->context, p->receiver,
p->name, p->slot, p->vector);
}
void AccessorAssembler::LoadIC_Noninlined(const LoadICParameters* p,
Node* receiver_map, Node* feedback,
Variable* var_handler,
Label* if_handler, Label* miss,
ExitPoint* exit_point) {
Label try_uninitialized(this, Label::kDeferred);
// Neither deprecated map nor monomorphic. These cases are handled in the
// bytecode handler.
CSA_ASSERT(this, Word32BinaryNot(IsDeprecatedMap(receiver_map)));
CSA_ASSERT(this,
WordNotEqual(receiver_map, LoadWeakCellValueUnchecked(feedback)));
CSA_ASSERT(this, WordNotEqual(LoadMap(feedback), FixedArrayMapConstant()));
DCHECK_EQ(MachineRepresentation::kTagged, var_handler->rep());
{
// Check megamorphic case.
GotoIfNot(WordEqual(feedback, LoadRoot(Heap::kmegamorphic_symbolRootIndex)),
&try_uninitialized);
TryProbeStubCache(isolate()->load_stub_cache(), p->receiver, p->name,
if_handler, var_handler, miss);
}
BIND(&try_uninitialized);
{
// Check uninitialized case.
GotoIfNot(
WordEqual(feedback, LoadRoot(Heap::kuninitialized_symbolRootIndex)),
miss);
exit_point->ReturnCallStub(
Builtins::CallableFor(isolate(), Builtins::kLoadIC_Uninitialized),
p->context, p->receiver, p->name, p->slot, p->vector);
}
}
void AccessorAssembler::LoadIC_Uninitialized(const LoadICParameters* p) {
Label miss(this, Label::kDeferred);
Node* receiver = p->receiver;
GotoIf(TaggedIsSmi(receiver), &miss);
Node* receiver_map = LoadMap(receiver);
Node* instance_type = LoadMapInstanceType(receiver_map);
// Optimistically write the state transition to the vector.
StoreFeedbackVectorSlot(p->vector, p->slot,
LoadRoot(Heap::kpremonomorphic_symbolRootIndex),
SKIP_WRITE_BARRIER, 0, SMI_PARAMETERS);
{
// Special case for Function.prototype load, because it's very common
// for ICs that are only executed once (MyFunc.prototype.foo = ...).
Label not_function_prototype(this, Label::kDeferred);
GotoIfNot(InstanceTypeEqual(instance_type, JS_FUNCTION_TYPE),
&not_function_prototype);
GotoIfNot(IsPrototypeString(p->name), &not_function_prototype);
// if (!(has_prototype_slot() && !has_non_instance_prototype())) use generic
// property loading mechanism.
GotoIfNot(
Word32Equal(
Word32And(LoadMapBitField(receiver_map),
Int32Constant(Map::HasPrototypeSlotBit::kMask |
Map::HasNonInstancePrototypeBit::kMask)),
Int32Constant(Map::HasPrototypeSlotBit::kMask)),
&not_function_prototype);
Return(LoadJSFunctionPrototype(receiver, &miss));
BIND(&not_function_prototype);
}
GenericPropertyLoad(receiver, receiver_map, instance_type, p, &miss,
kDontUseStubCache);
BIND(&miss);
{
// Undo the optimistic state transition.
StoreFeedbackVectorSlot(p->vector, p->slot,
LoadRoot(Heap::kuninitialized_symbolRootIndex),
SKIP_WRITE_BARRIER, 0, SMI_PARAMETERS);
TailCallRuntime(Runtime::kLoadIC_Miss, p->context, p->receiver, p->name,
p->slot, p->vector);
}
}
void AccessorAssembler::LoadGlobalIC(TNode<FeedbackVector> vector, Node* slot,
const LazyNode<Context>& lazy_context,
const LazyNode<Name>& lazy_name,
TypeofMode typeof_mode,
ExitPoint* exit_point,
ParameterMode slot_mode) {
Label try_handler(this, Label::kDeferred), miss(this, Label::kDeferred);
LoadGlobalIC_TryPropertyCellCase(vector, slot, lazy_context, exit_point,
&try_handler, &miss, slot_mode);
BIND(&try_handler);
LoadGlobalIC_TryHandlerCase(vector, slot, lazy_context, lazy_name,
typeof_mode, exit_point, &miss, slot_mode);
BIND(&miss);
{
Comment("LoadGlobalIC_MissCase");
TNode<Context> context = lazy_context();
TNode<Name> name = lazy_name();
exit_point->ReturnCallRuntime(Runtime::kLoadGlobalIC_Miss, context, name,
ParameterToTagged(slot, slot_mode), vector);
}
}
void AccessorAssembler::LoadGlobalIC_TryPropertyCellCase(
TNode<FeedbackVector> vector, Node* slot,
const LazyNode<Context>& lazy_context, ExitPoint* exit_point,
Label* try_handler, Label* miss, ParameterMode slot_mode) {
Comment("LoadGlobalIC_TryPropertyCellCase");
Label if_lexical_var(this), if_property_cell(this);
TNode<Object> maybe_weak_cell =
LoadFeedbackVectorSlot(vector, slot, 0, slot_mode);
Branch(TaggedIsSmi(maybe_weak_cell), &if_lexical_var, &if_property_cell);
BIND(&if_property_cell);
{
TNode<WeakCell> weak_cell = CAST(maybe_weak_cell);
// Load value or try handler case if the {weak_cell} is cleared.
TNode<PropertyCell> property_cell =
CAST(LoadWeakCellValue(weak_cell, try_handler));
TNode<Object> value =
LoadObjectField(property_cell, PropertyCell::kValueOffset);
GotoIf(WordEqual(value, TheHoleConstant()), miss);
exit_point->Return(value);
}
BIND(&if_lexical_var);
{
Comment("Load lexical variable");
TNode<IntPtrT> lexical_handler = SmiUntag(CAST(maybe_weak_cell));
TNode<IntPtrT> context_index =
Signed(DecodeWord<GlobalICNexus::ContextIndexBits>(lexical_handler));
TNode<IntPtrT> slot_index =
Signed(DecodeWord<GlobalICNexus::SlotIndexBits>(lexical_handler));
TNode<Context> context = lazy_context();
TNode<Context> script_context = LoadScriptContext(context, context_index);
TNode<Object> result = LoadContextElement(script_context, slot_index);
exit_point->Return(result);
}
}
void AccessorAssembler::LoadGlobalIC_TryHandlerCase(
TNode<FeedbackVector> vector, Node* slot,
const LazyNode<Context>& lazy_context, const LazyNode<Name>& lazy_name,
TypeofMode typeof_mode, ExitPoint* exit_point, Label* miss,
ParameterMode slot_mode) {
Comment("LoadGlobalIC_TryHandlerCase");
Label call_handler(this), non_smi(this);
Node* handler = LoadFeedbackVectorSlot(vector, slot, kPointerSize, slot_mode);
GotoIf(WordEqual(handler, LoadRoot(Heap::kuninitialized_symbolRootIndex)),
miss);
OnNonExistent on_nonexistent = typeof_mode == NOT_INSIDE_TYPEOF
? OnNonExistent::kThrowReferenceError
: OnNonExistent::kReturnUndefined;
TNode<Context> context = lazy_context();
TNode<Context> native_context = LoadNativeContext(context);
TNode<JSGlobalProxy> receiver =
CAST(LoadContextElement(native_context, Context::GLOBAL_PROXY_INDEX));
Node* holder = LoadContextElement(native_context, Context::EXTENSION_INDEX);
LoadICParameters p(context, receiver, lazy_name(),
ParameterToTagged(slot, slot_mode), vector, holder);
HandleLoadICHandlerCase(&p, handler, miss, exit_point, ICMode::kGlobalIC,
on_nonexistent);
}
void AccessorAssembler::KeyedLoadIC(const LoadICParameters* p) {
ExitPoint direct_exit(this);
VARIABLE(var_handler, MachineRepresentation::kTagged);
Label if_handler(this, &var_handler), try_polymorphic(this, Label::kDeferred),
try_megamorphic(this, Label::kDeferred),
try_polymorphic_name(this, Label::kDeferred),
miss(this, Label::kDeferred);
Node* receiver_map = LoadReceiverMap(p->receiver);
GotoIf(IsDeprecatedMap(receiver_map), &miss);
// Check monomorphic case.
Node* feedback =
TryMonomorphicCase(p->slot, p->vector, receiver_map, &if_handler,
&var_handler, &try_polymorphic);
BIND(&if_handler);
{
HandleLoadICHandlerCase(p, var_handler.value(), &miss, &direct_exit,
ICMode::kNonGlobalIC,
OnNonExistent::kReturnUndefined, kSupportElements);
}
BIND(&try_polymorphic);
{
// Check polymorphic case.
Comment("KeyedLoadIC_try_polymorphic");
GotoIfNot(WordEqual(LoadMap(feedback), FixedArrayMapConstant()),
&try_megamorphic);
HandlePolymorphicCase(receiver_map, feedback, &if_handler, &var_handler,
&miss, 2);
}
BIND(&try_megamorphic);
{
// Check megamorphic case.
Comment("KeyedLoadIC_try_megamorphic");
GotoIfNot(WordEqual(feedback, LoadRoot(Heap::kmegamorphic_symbolRootIndex)),
&try_polymorphic_name);
// TODO(jkummerow): Inline this? Or some of it?
TailCallStub(
Builtins::CallableFor(isolate(), Builtins::kKeyedLoadIC_Megamorphic),
p->context, p->receiver, p->name, p->slot, p->vector);
}
BIND(&try_polymorphic_name);
{
// We might have a name in feedback, and a fixed array in the next slot.
Node* name = p->name;
Comment("KeyedLoadIC_try_polymorphic_name");
VARIABLE(var_name, MachineRepresentation::kTagged, name);
VARIABLE(var_index, MachineType::PointerRepresentation());
Label if_polymorphic_name(this, &var_name), if_internalized(this),
if_notinternalized(this, Label::kDeferred);
// Fast-case: The recorded {feedback} matches the {name}.
GotoIf(WordEqual(feedback, name), &if_polymorphic_name);
// Try to internalize the {name} if it isn't already.
TryToName(name, &miss, &var_index, &if_internalized, &var_name, &miss,
&if_notinternalized);
BIND(&if_internalized);
{
// The {var_name} now contains a unique name.
Branch(WordEqual(feedback, var_name.value()), &if_polymorphic_name,
&miss);
}
BIND(&if_notinternalized);
{
// Try to internalize the {name}.
Node* function = ExternalConstant(
ExternalReference::try_internalize_string_function(isolate()));
var_name.Bind(CallCFunction1(MachineType::AnyTagged(),
MachineType::AnyTagged(), function, name));
Goto(&if_internalized);
}
BIND(&if_polymorphic_name);
{
// If the name comparison succeeded, we know we have a fixed array with
// at least one map/handler pair.
Node* name = var_name.value();
TailCallBuiltin(Builtins::kKeyedLoadIC_PolymorphicName, p->context,
p->receiver, name, p->slot, p->vector);
}
}
BIND(&miss);
{
Comment("KeyedLoadIC_miss");
TailCallRuntime(Runtime::kKeyedLoadIC_Miss, p->context, p->receiver,
p->name, p->slot, p->vector);
}
}
void AccessorAssembler::KeyedLoadICGeneric(const LoadICParameters* p) {
VARIABLE(var_index, MachineType::PointerRepresentation());
VARIABLE(var_unique, MachineRepresentation::kTagged);
var_unique.Bind(p->name); // Dummy initialization.
Label if_index(this), if_unique_name(this), if_notunique(this), slow(this);
Node* receiver = p->receiver;
GotoIf(TaggedIsSmi(receiver), &slow);
Node* receiver_map = LoadMap(receiver);
Node* instance_type = LoadMapInstanceType(receiver_map);
TryToName(p->name, &if_index, &var_index, &if_unique_name, &var_unique, &slow,
&if_notunique);
BIND(&if_index);
{
GenericElementLoad(receiver, receiver_map, instance_type, var_index.value(),
&slow);
}
BIND(&if_unique_name);
{
LoadICParameters pp = *p;
pp.name = var_unique.value();
GenericPropertyLoad(receiver, receiver_map, instance_type, &pp, &slow);
}
BIND(&if_notunique);