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chromium / v8 / v8 / 02e64e0d09bea3240135bf0b2d4ef423f66b3a82 / . / src / ic / accessor-assembler.cc
blob: 2531a3dea80878a5dfd8af92c3788156a75c0c28 [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/ast/ast.h"
#include "src/base/optional.h"
#include "src/builtins/builtins-constructor-gen.h"
#include "src/codegen/code-factory.h"
#include "src/codegen/interface-descriptors-inl.h"
#include "src/ic/handler-configuration.h"
#include "src/ic/ic.h"
#include "src/ic/keyed-store-generic.h"
#include "src/ic/stub-cache.h"
#include "src/logging/counters.h"
#include "src/objects/cell.h"
#include "src/objects/feedback-vector.h"
#include "src/objects/foreign.h"
#include "src/objects/heap-number.h"
#include "src/objects/megadom-handler.h"
#include "src/objects/module.h"
#include "src/objects/objects-inl.h"
#include "src/objects/property-details.h"
#include "src/objects/smi.h"
namespace v8 {
namespace internal {
//////////////////// Private helpers.
#define LOAD_KIND(kind) \
Int32Constant(static_cast<intptr_t>(LoadHandler::Kind::kind))
#define STORE_KIND(kind) \
Int32Constant(static_cast<intptr_t>(StoreHandler::Kind::kind))
// Loads dataX field from the DataHandler object.
TNode<MaybeObject> AccessorAssembler::LoadHandlerDataField(
TNode<DataHandler> handler, int data_index) {
#ifdef DEBUG
TNode<Map> handler_map = LoadMap(handler);
TNode<Uint16T> instance_type = LoadMapInstanceType(handler_map);
#endif
CSA_DCHECK(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();
}
USE(minimum_size);
CSA_DCHECK(this, UintPtrGreaterThanOrEqual(
LoadMapInstanceSizeInWords(handler_map),
IntPtrConstant(minimum_size / kTaggedSize)));
return LoadMaybeWeakObjectField(handler, offset);
}
TNode<HeapObjectReference> AccessorAssembler::TryMonomorphicCase(
TNode<TaggedIndex> slot, TNode<FeedbackVector> vector,
TNode<HeapObjectReference> weak_lookup_start_object_map, Label* if_handler,
TVariable<MaybeObject>* 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.
int32_t header_size =
FeedbackVector::kRawFeedbackSlotsOffset - 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.
TNode<IntPtrT> offset = ElementOffsetFromIndex(slot, HOLEY_ELEMENTS);
TNode<HeapObjectReference> feedback = CAST(Load<MaybeObject>(
vector, IntPtrAdd(offset, IntPtrConstant(header_size))));
// Try to quickly handle the monomorphic case without knowing for sure
// if we have a weak reference in feedback.
CSA_DCHECK(this,
IsMap(GetHeapObjectAssumeWeak(weak_lookup_start_object_map)));
GotoIfNot(TaggedEqual(feedback, weak_lookup_start_object_map), if_miss);
TNode<MaybeObject> handler = UncheckedCast<MaybeObject>(
Load(MachineType::AnyTagged(), vector,
IntPtrAdd(offset, IntPtrConstant(header_size + kTaggedSize))));
*var_handler = handler;
Goto(if_handler);
return feedback;
}
void AccessorAssembler::HandlePolymorphicCase(
TNode<HeapObjectReference> weak_lookup_start_object_map,
TNode<WeakFixedArray> feedback, Label* if_handler,
TVariable<MaybeObject>* var_handler, Label* if_miss) {
Comment("HandlePolymorphicCase");
DCHECK_EQ(MachineRepresentation::kTagged, var_handler->rep());
// Iterate {feedback} array.
const int kEntrySize = 2;
// Load the {feedback} array length.
TNode<IntPtrT> length = LoadAndUntagWeakFixedArrayLength(feedback);
CSA_DCHECK(this, IntPtrLessThanOrEqual(IntPtrConstant(kEntrySize), length));
// This is a hand-crafted loop that iterates backwards and only compares
// against zero at the end, since we already know that we will have at least a
// single entry in the {feedback} array anyways.
TVARIABLE(IntPtrT, var_index, IntPtrSub(length, IntPtrConstant(kEntrySize)));
Label loop(this, &var_index), loop_next(this);
Goto(&loop);
BIND(&loop);
{
TNode<MaybeObject> maybe_cached_map =
LoadWeakFixedArrayElement(feedback, var_index.value());
CSA_DCHECK(this,
IsMap(GetHeapObjectAssumeWeak(weak_lookup_start_object_map)));
GotoIfNot(TaggedEqual(maybe_cached_map, weak_lookup_start_object_map),
&loop_next);
// Found, now call handler.
TNode<MaybeObject> handler =
LoadWeakFixedArrayElement(feedback, var_index.value(), kTaggedSize);
*var_handler = handler;
Goto(if_handler);
BIND(&loop_next);
var_index =
Signed(IntPtrSub(var_index.value(), IntPtrConstant(kEntrySize)));
Branch(IntPtrGreaterThanOrEqual(var_index.value(), IntPtrConstant(0)),
&loop, if_miss);
}
}
void AccessorAssembler::TryMegaDOMCase(TNode<Object> lookup_start_object,
TNode<Map> lookup_start_object_map,
TVariable<MaybeObject>* var_handler,
TNode<Object> vector,
TNode<TaggedIndex> slot, Label* miss,
ExitPoint* exit_point) {
// Check if the receiver is a JS_API_OBJECT
GotoIfNot(IsJSApiObjectMap(lookup_start_object_map), miss);
// Check if receiver requires access check
GotoIf(IsSetWord32<Map::Bits1::IsAccessCheckNeededBit>(
LoadMapBitField(lookup_start_object_map)),
miss);
CSA_DCHECK(this, TaggedEqual(LoadFeedbackVectorSlot(CAST(vector), slot),
MegaDOMSymbolConstant()));
// In some cases, we load the
TNode<MegaDomHandler> handler;
if (var_handler->IsBound()) {
handler = CAST(var_handler->value());
} else {
TNode<MaybeObject> maybe_handler =
LoadFeedbackVectorSlot(CAST(vector), slot, kTaggedSize);
CSA_DCHECK(this, IsStrong(maybe_handler));
handler = CAST(maybe_handler);
}
// Check if dom protector cell is still valid
GotoIf(IsMegaDOMProtectorCellInvalid(), miss);
// Load the getter
TNode<MaybeObject> maybe_getter = LoadMegaDomHandlerAccessor(handler);
CSA_DCHECK(this, IsWeakOrCleared(maybe_getter));
TNode<FunctionTemplateInfo> getter =
CAST(GetHeapObjectAssumeWeak(maybe_getter, miss));
// Load the accessor context
TNode<MaybeObject> maybe_context = LoadMegaDomHandlerContext(handler);
CSA_DCHECK(this, IsWeakOrCleared(maybe_context));
TNode<Context> context = CAST(GetHeapObjectAssumeWeak(maybe_context, miss));
// TODO(gsathya): This builtin throws an exception on interface check fail but
// we should miss to the runtime.
exit_point->Return(
CallBuiltin(Builtin::kCallFunctionTemplate_CheckCompatibleReceiver,
context, getter, IntPtrConstant(1), lookup_start_object));
}
void AccessorAssembler::HandleLoadICHandlerCase(
const LazyLoadICParameters* p, TNode<MaybeObject> handler, Label* miss,
ExitPoint* exit_point, ICMode ic_mode, OnNonExistent on_nonexistent,
ElementSupport support_elements, LoadAccessMode access_mode) {
Comment("have_handler");
TVARIABLE(Object, var_holder, p->lookup_start_object());
TVARIABLE(MaybeObject, var_smi_handler, handler);
Label if_smi_handler(this, {&var_holder, &var_smi_handler});
Label try_proto_handler(this, Label::kDeferred),
call_code_handler(this, Label::kDeferred),
call_getter(this, Label::kDeferred);
Branch(TaggedIsSmi(handler), &if_smi_handler, &try_proto_handler);
BIND(&try_proto_handler);
{
GotoIf(IsWeakOrCleared(handler), &call_getter);
GotoIf(IsCode(CAST(handler)), &call_code_handler);
HandleLoadICProtoHandler(p, CAST(handler), &var_holder, &var_smi_handler,
&if_smi_handler, miss, exit_point, ic_mode,
access_mode);
}
// |handler| is a Smi, encoding what to do. See SmiHandler methods
// for the encoding format.
BIND(&if_smi_handler);
{
HandleLoadICSmiHandlerCase(
p, var_holder.value(), CAST(var_smi_handler.value()), handler, miss,
exit_point, ic_mode, on_nonexistent, support_elements, access_mode);
}
BIND(&call_getter);
{
if (access_mode == LoadAccessMode::kHas) {
exit_point->Return(TrueConstant());
} else {
TNode<HeapObject> strong_handler = GetHeapObjectAssumeWeak(handler, miss);
TNode<Object> getter = LoadAccessorPairGetter(CAST(strong_handler));
exit_point->Return(Call(p->context(), getter, p->receiver()));
}
}
BIND(&call_code_handler);
{
TNode<Code> code_handler = CAST(handler);
exit_point->ReturnCallStub(LoadWithVectorDescriptor{}, code_handler,
p->context(), p->lookup_start_object(),
p->name(), p->slot(), p->vector());
}
}
void AccessorAssembler::HandleLoadCallbackProperty(
const LazyLoadICParameters* p, TNode<JSObject> holder,
TNode<Word32T> handler_word, ExitPoint* exit_point) {
Comment("native_data_property_load");
TNode<IntPtrT> descriptor =
Signed(DecodeWordFromWord32<LoadHandler::DescriptorBits>(handler_word));
Callable callable = CodeFactory::ApiGetter(isolate());
TNode<AccessorInfo> accessor_info =
CAST(LoadDescriptorValue(LoadMap(holder), descriptor));
exit_point->ReturnCallStub(callable, p->context(), p->receiver(), holder,
accessor_info);
}
void AccessorAssembler::HandleLoadAccessor(
const LazyLoadICParameters* p, TNode<CallHandlerInfo> call_handler_info,
TNode<Word32T> handler_word, TNode<DataHandler> handler,
TNode<Uint32T> handler_kind, ExitPoint* exit_point) {
Comment("api_getter");
// Context is stored either in data2 or data3 field depending on whether
// the access check is enabled for this handler or not.
TNode<MaybeObject> maybe_context = Select<MaybeObject>(
IsSetWord32<LoadHandler::DoAccessCheckOnLookupStartObjectBits>(
handler_word),
[=] { return LoadHandlerDataField(handler, 3); },
[=] { return LoadHandlerDataField(handler, 2); });
CSA_DCHECK(this, IsWeakOrCleared(maybe_context));
CSA_CHECK(this, IsNotCleared(maybe_context));
TNode<HeapObject> context = GetHeapObjectAssumeWeak(maybe_context);
TNode<RawPtrT> callback = LoadCallHandlerInfoJsCallbackPtr(call_handler_info);
TNode<Object> data =
LoadObjectField(call_handler_info, CallHandlerInfo::kDataOffset);
TVARIABLE(HeapObject, api_holder, CAST(p->lookup_start_object()));
Label load(this);
GotoIf(Word32Equal(handler_kind, LOAD_KIND(kApiGetter)), &load);
CSA_DCHECK(this,
Word32Equal(handler_kind, LOAD_KIND(kApiGetterHolderIsPrototype)));
api_holder = LoadMapPrototype(LoadMap(CAST(p->lookup_start_object())));
Goto(&load);
BIND(&load);
TNode<Int32T> argc = Int32Constant(0);
exit_point->Return(CallApiCallback(context, callback, argc, data,
api_holder.value(), p->receiver()));
}
void AccessorAssembler::HandleLoadField(TNode<JSObject> holder,
TNode<Word32T> handler_word,
TVariable<Float64T>* var_double_value,
Label* rebox_double, Label* miss,
ExitPoint* exit_point) {
Comment("LoadField");
TNode<IntPtrT> index =
Signed(DecodeWordFromWord32<LoadHandler::FieldIndexBits>(handler_word));
TNode<IntPtrT> offset = IntPtrMul(index, IntPtrConstant(kTaggedSize));
Label inobject(this), out_of_object(this);
Branch(IsSetWord32<LoadHandler::IsInobjectBits>(handler_word), &inobject,
&out_of_object);
BIND(&inobject);
{
Label is_double(this);
GotoIf(IsSetWord32<LoadHandler::IsDoubleBits>(handler_word), &is_double);
exit_point->Return(LoadObjectField(holder, offset));
BIND(&is_double);
TNode<Object> heap_number = LoadObjectField(holder, offset);
// This is not an "old" Smi value from before a Smi->Double transition.
// Rather, it's possible that since the last update of this IC, the Double
// field transitioned to a Tagged field, and was then assigned a Smi.
GotoIf(TaggedIsSmi(heap_number), miss);
GotoIfNot(IsHeapNumber(CAST(heap_number)), miss);
*var_double_value = LoadHeapNumberValue(CAST(heap_number));
Goto(rebox_double);
}
BIND(&out_of_object);
{
Label is_double(this);
TNode<HeapObject> properties = LoadFastProperties(holder);
TNode<Object> value = LoadObjectField(properties, offset);
GotoIf(IsSetWord32<LoadHandler::IsDoubleBits>(handler_word), &is_double);
exit_point->Return(value);
BIND(&is_double);
// This is not an "old" Smi value from before a Smi->Double transition.
// Rather, it's possible that since the last update of this IC, the Double
// field transitioned to a Tagged field, and was then assigned a Smi.
GotoIf(TaggedIsSmi(value), miss);
GotoIfNot(IsHeapNumber(CAST(value)), miss);
*var_double_value = LoadHeapNumberValue(CAST(value));
Goto(rebox_double);
}
}
#if V8_ENABLE_WEBASSEMBLY
void AccessorAssembler::HandleLoadWasmField(
TNode<WasmObject> holder, TNode<Int32T> wasm_value_type,
TNode<IntPtrT> field_offset, TVariable<Float64T>* var_double_value,
Label* rebox_double, ExitPoint* exit_point) {
Label type_I8(this), type_I16(this), type_I32(this), type_U32(this),
type_I64(this), type_U64(this), type_F32(this), type_F64(this),
type_Ref(this), unsupported_type(this, Label::kDeferred),
unexpected_type(this, Label::kDeferred);
Label* wasm_value_type_labels[] = {
&type_I8, &type_I16, &type_I32, &type_U32, &type_I64,
&type_F32, &type_F64, &type_Ref, &type_Ref, &unsupported_type};
int32_t wasm_value_types[] = {
static_cast<int32_t>(WasmValueType::kI8),
static_cast<int32_t>(WasmValueType::kI16),
static_cast<int32_t>(WasmValueType::kI32),
static_cast<int32_t>(WasmValueType::kU32),
static_cast<int32_t>(WasmValueType::kI64),
static_cast<int32_t>(WasmValueType::kF32),
static_cast<int32_t>(WasmValueType::kF64),
static_cast<int32_t>(WasmValueType::kRef),
static_cast<int32_t>(WasmValueType::kRefNull),
// TODO(v8:11804): support the following value types.
static_cast<int32_t>(WasmValueType::kS128)};
const size_t kWasmValueTypeCount =
static_cast<size_t>(WasmValueType::kNumTypes);
DCHECK_EQ(kWasmValueTypeCount, arraysize(wasm_value_types));
DCHECK_EQ(kWasmValueTypeCount, arraysize(wasm_value_type_labels));
Switch(wasm_value_type, &unexpected_type, wasm_value_types,
wasm_value_type_labels, kWasmValueTypeCount);
BIND(&type_I8);
{
Comment("type_I8");
TNode<Int32T> value = LoadObjectField<Int8T>(holder, field_offset);
exit_point->Return(SmiFromInt32(value));
}
BIND(&type_I16);
{
Comment("type_I16");
TNode<Int32T> value = LoadObjectField<Int16T>(holder, field_offset);
exit_point->Return(SmiFromInt32(value));
}
BIND(&type_I32);
{
Comment("type_I32");
TNode<Int32T> value = LoadObjectField<Int32T>(holder, field_offset);
exit_point->Return(ChangeInt32ToTagged(value));
}
BIND(&type_U32);
{
Comment("type_U32");
TNode<Uint32T> value = LoadObjectField<Uint32T>(holder, field_offset);
exit_point->Return(ChangeUint32ToTagged(value));
}
BIND(&type_I64);
{
Comment("type_I64");
TNode<RawPtrT> data_pointer =
ReinterpretCast<RawPtrT>(BitcastTaggedToWord(holder));
TNode<BigInt> value = LoadFixedBigInt64ArrayElementAsTagged(
data_pointer,
Signed(IntPtrSub(field_offset, IntPtrConstant(kHeapObjectTag))));
exit_point->Return(value);
}
BIND(&type_F32);
{
Comment("type_F32");
TNode<Float32T> value = LoadObjectField<Float32T>(holder, field_offset);
*var_double_value = ChangeFloat32ToFloat64(value);
Goto(rebox_double);
}
BIND(&type_F64);
{
Comment("type_F64");
TNode<Float64T> value = LoadObjectField<Float64T>(holder, field_offset);
*var_double_value = value;
Goto(rebox_double);
}
BIND(&type_Ref);
{
Comment("type_Ref");
TNode<Object> value = LoadObjectField(holder, field_offset);
exit_point->Return(value);
}
BIND(&unsupported_type);
{
Print("Not supported Wasm field type");
Unreachable();
}
BIND(&unexpected_type);
{ Unreachable(); }
}
void AccessorAssembler::HandleLoadWasmField(
TNode<WasmObject> holder, TNode<Word32T> handler_word,
TVariable<Float64T>* var_double_value, Label* rebox_double,
ExitPoint* exit_point) {
Comment("LoadWasmField");
TNode<Int32T> wasm_value_type =
Signed(DecodeWord32<LoadHandler::WasmFieldTypeBits>(handler_word));
TNode<IntPtrT> field_offset = Signed(
DecodeWordFromWord32<LoadHandler::WasmFieldOffsetBits>(handler_word));
HandleLoadWasmField(holder, wasm_value_type, field_offset, var_double_value,
rebox_double, exit_point);
}
#endif // V8_ENABLE_WEBASSEMBLY
TNode<Object> AccessorAssembler::LoadDescriptorValue(
TNode<Map> map, TNode<IntPtrT> descriptor_entry) {
return CAST(LoadDescriptorValueOrFieldType(map, descriptor_entry));
}
TNode<MaybeObject> AccessorAssembler::LoadDescriptorValueOrFieldType(
TNode<Map> map, TNode<IntPtrT> descriptor_entry) {
TNode<DescriptorArray> descriptors = LoadMapDescriptors(map);
return LoadFieldTypeByDescriptorEntry(descriptors, descriptor_entry);
}
void AccessorAssembler::HandleLoadICSmiHandlerCase(
const LazyLoadICParameters* p, TNode<Object> holder, TNode<Smi> smi_handler,
TNode<MaybeObject> handler, Label* miss, ExitPoint* exit_point,
ICMode ic_mode, OnNonExistent on_nonexistent,
ElementSupport support_elements, LoadAccessMode access_mode) {
TVARIABLE(Float64T, var_double_value);
Label rebox_double(this, &var_double_value);
TNode<Int32T> handler_word = SmiToInt32(smi_handler);
TNode<Uint32T> handler_kind =
DecodeWord32<LoadHandler::KindBits>(handler_word);
if (support_elements == kSupportElements) {
Label if_element(this), if_indexed_string(this), if_property(this),
if_hole(this), unimplemented_elements_kind(this),
if_oob(this, Label::kDeferred), try_string_to_array_index(this),
emit_element_load(this);
TVARIABLE(IntPtrT, var_intptr_index);
GotoIf(Word32Equal(handler_kind, LOAD_KIND(kElement)), &if_element);
if (access_mode == LoadAccessMode::kHas) {
CSA_DCHECK(this, Word32NotEqual(handler_kind, LOAD_KIND(kIndexedString)));
Goto(&if_property);
} else {
Branch(Word32Equal(handler_kind, LOAD_KIND(kIndexedString)),
&if_indexed_string, &if_property);
}
BIND(&if_element);
{
Comment("element_load");
// TODO(ishell): implement
CSA_DCHECK(this,
IsClearWord32<LoadHandler::IsWasmArrayBits>(handler_word));
TVARIABLE(Int32T, var_instance_type);
TNode<IntPtrT> intptr_index = TryToIntptr(
p->name(), &try_string_to_array_index, &var_instance_type);
var_intptr_index = intptr_index;
Goto(&emit_element_load);
BIND(&try_string_to_array_index);
{
GotoIfNot(IsStringInstanceType(var_instance_type.value()), miss);
TNode<ExternalReference> function = ExternalConstant(
ExternalReference::string_to_array_index_function());
TNode<Int32T> result = UncheckedCast<Int32T>(
CallCFunction(function, MachineType::Int32(),
std::make_pair(MachineType::AnyTagged(), p->name())));
GotoIf(Word32Equal(Int32Constant(-1), result), miss);
CSA_DCHECK(this, Int32GreaterThanOrEqual(result, Int32Constant(0)));
var_intptr_index = ChangeInt32ToIntPtr(result);
Goto(&emit_element_load);
}
BIND(&emit_element_load);
{
TNode<BoolT> is_jsarray_condition =
IsSetWord32<LoadHandler::IsJsArrayBits>(handler_word);
TNode<Uint32T> elements_kind =
DecodeWord32<LoadHandler::ElementsKindBits>(handler_word);
EmitElementLoad(CAST(holder), elements_kind, var_intptr_index.value(),
is_jsarray_condition, &if_hole, &rebox_double,
&var_double_value, &unimplemented_elements_kind,
&if_oob, miss, exit_point, access_mode);
}
}
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);
// Check if we're allowed to handle OOB accesses.
TNode<BoolT> allow_out_of_bounds =
IsSetWord32<LoadHandler::AllowOutOfBoundsBits>(handler_word);
GotoIfNot(allow_out_of_bounds, miss);
// 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, except
// in case of typed arrays, where integer indexed properties
// aren't looked up in the prototype chain.
GotoIf(IsJSTypedArray(CAST(holder)), &return_undefined);
if (Is64()) {
GotoIfNot(
UintPtrLessThanOrEqual(var_intptr_index.value(),
IntPtrConstant(JSObject::kMaxElementIndex)),
miss);
} else {
GotoIf(IntPtrLessThan(var_intptr_index.value(), IntPtrConstant(0)),
miss);
}
// For all other receivers we need to check that the prototype chain
// doesn't contain any elements.
BranchIfPrototypesHaveNoElements(LoadMap(CAST(holder)), &return_undefined,
miss);
BIND(&return_undefined);
exit_point->Return(access_mode == LoadAccessMode::kHas
? FalseConstant()
: UndefinedConstant());
}
BIND(&if_hole);
{
Comment("convert hole");
GotoIfNot(IsSetWord32<LoadHandler::ConvertHoleBits>(handler_word), miss);
GotoIf(IsNoElementsProtectorCellInvalid(), miss);
exit_point->Return(access_mode == LoadAccessMode::kHas
? FalseConstant()
: UndefinedConstant());
}
if (access_mode != LoadAccessMode::kHas) {
BIND(&if_indexed_string);
{
Label if_oob_string(this, Label::kDeferred);
Comment("indexed string");
TNode<String> string_holder = CAST(holder);
TNode<IntPtrT> index = TryToIntptr(p->name(), miss);
TNode<UintPtrT> length =
Unsigned(LoadStringLengthAsWord(string_holder));
GotoIf(UintPtrGreaterThanOrEqual(index, length), &if_oob_string);
TNode<Int32T> code = StringCharCodeAt(string_holder, Unsigned(index));
TNode<String> result = StringFromSingleCharCode(code);
Return(result);
BIND(&if_oob_string);
if (Is64()) {
// Indices >= 4294967295 are stored as named properties; handle them
// in the runtime.
GotoIfNot(UintPtrLessThanOrEqual(
index, IntPtrConstant(JSObject::kMaxElementIndex)),
miss);
} else {
GotoIf(IntPtrLessThan(index, IntPtrConstant(0)), miss);
}
TNode<BoolT> allow_out_of_bounds =
IsSetWord32<LoadHandler::AllowOutOfBoundsBits>(handler_word);
GotoIfNot(allow_out_of_bounds, miss);
GotoIf(IsNoElementsProtectorCellInvalid(), miss);
Return(UndefinedConstant());
}
}
BIND(&if_property);
Comment("property_load");
}
if (access_mode == LoadAccessMode::kHas) {
HandleLoadICSmiHandlerHasNamedCase(p, holder, handler_kind, miss,
exit_point, ic_mode);
} else {
HandleLoadICSmiHandlerLoadNamedCase(
p, holder, handler_kind, handler_word, &rebox_double, &var_double_value,
handler, miss, exit_point, ic_mode, on_nonexistent, support_elements);
}
}
void AccessorAssembler::HandleLoadICSmiHandlerLoadNamedCase(
const LazyLoadICParameters* p, TNode<Object> holder,
TNode<Uint32T> handler_kind, TNode<Word32T> handler_word,
Label* rebox_double, TVariable<Float64T>* var_double_value,
TNode<MaybeObject> handler, Label* miss, ExitPoint* exit_point,
ICMode ic_mode, OnNonExistent on_nonexistent,
ElementSupport support_elements) {
Label constant(this), field(this), normal(this, Label::kDeferred),
slow(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, Label::kDeferred),
api_getter(this, Label::kDeferred);
GotoIf(Word32Equal(handler_kind, LOAD_KIND(kField)), &field);
GotoIf(Word32Equal(handler_kind, LOAD_KIND(kConstantFromPrototype)),
&constant);
GotoIf(Word32Equal(handler_kind, LOAD_KIND(kNonExistent)), &nonexistent);
GotoIf(Word32Equal(handler_kind, LOAD_KIND(kNormal)), &normal);
GotoIf(Word32Equal(handler_kind, LOAD_KIND(kAccessorFromPrototype)),
&accessor);
GotoIf(Word32Equal(handler_kind, LOAD_KIND(kNativeDataProperty)),
&native_data_property);
GotoIf(Word32Equal(handler_kind, LOAD_KIND(kApiGetter)), &api_getter);
GotoIf(Word32Equal(handler_kind, LOAD_KIND(kApiGetterHolderIsPrototype)),
&api_getter);
GotoIf(Word32Equal(handler_kind, LOAD_KIND(kGlobal)), &global);
GotoIf(Word32Equal(handler_kind, LOAD_KIND(kSlow)), &slow);
GotoIf(Word32Equal(handler_kind, LOAD_KIND(kProxy)), &proxy);
Branch(Word32Equal(handler_kind, LOAD_KIND(kModuleExport)), &module_export,
&interceptor);
BIND(&field);
{
#if V8_ENABLE_WEBASSEMBLY
Label is_wasm_field(this);
GotoIf(IsSetWord32<LoadHandler::IsWasmStructBits>(handler_word),
&is_wasm_field);
#else
CSA_DCHECK(this,
IsClearWord32<LoadHandler::IsWasmStructBits>(handler_word));
#endif // V8_ENABLE_WEBASSEMBLY
HandleLoadField(CAST(holder), handler_word, var_double_value, rebox_double,
miss, exit_point);
#if V8_ENABLE_WEBASSEMBLY
BIND(&is_wasm_field);
HandleLoadWasmField(CAST(holder), handler_word, var_double_value,
rebox_double, exit_point);
#endif // V8_ENABLE_WEBASSEMBLY
}
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");
exit_point->Return(holder);
}
BIND(&normal);
{
Comment("load_normal");
TNode<PropertyDictionary> properties =
CAST(LoadSlowProperties(CAST(holder)));
TVARIABLE(IntPtrT, var_name_index);
Label found(this, &var_name_index);
NameDictionaryLookup<PropertyDictionary>(properties, CAST(p->name()),
&found, &var_name_index, miss);
BIND(&found);
{
TVARIABLE(Uint32T, var_details);
TVARIABLE(Object, var_value);
LoadPropertyFromDictionary<PropertyDictionary>(
properties, var_name_index.value(), &var_details, &var_value);
TNode<Object> value = CallGetterIfAccessor(
var_value.value(), CAST(holder), var_details.value(), p->context(),
p->receiver(), p->name(), miss);
exit_point->Return(value);
}
}
BIND(&accessor);
{
Comment("accessor_load");
// The "holder" slot (data1) in the from-prototype LoadHandler is instead
// directly the getter function.
TNode<HeapObject> getter = CAST(holder);
CSA_DCHECK(this, IsCallable(getter));
exit_point->Return(Call(p->context(), getter, p->receiver()));
}
BIND(&native_data_property);
{
GotoIf(IsSideEffectFreeDebuggingActive(), &slow);
HandleLoadCallbackProperty(p, CAST(holder), handler_word, exit_point);
}
BIND(&api_getter);
{
if (p->receiver() != p->lookup_start_object()) {
// Force super ICs using API getters into the slow path, so that we get
// the correct receiver checks.
Goto(&slow);
} else {
GotoIf(IsSideEffectFreeDebuggingActive(), &slow);
HandleLoadAccessor(p, CAST(holder), handler_word, CAST(handler),
handler_kind, exit_point);
}
}
BIND(&proxy);
{
// TODO(mythria): LoadGlobals don't use this path. LoadGlobals need special
// handling with proxies which is currently not supported by builtins. So
// for such cases, we should install a slow path and never reach here. Fix
// it to not generate this for LoadGlobals.
CSA_DCHECK(this,
WordNotEqual(IntPtrConstant(static_cast<int>(on_nonexistent)),
IntPtrConstant(static_cast<int>(
OnNonExistent::kThrowReferenceError))));
TVARIABLE(IntPtrT, var_index);
TVARIABLE(Name, var_unique);
Label if_index(this), if_unique_name(this),
to_name_failed(this, Label::kDeferred);
if (support_elements == kSupportElements) {
DCHECK_NE(on_nonexistent, OnNonExistent::kThrowReferenceError);
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(), Builtin::kProxyGetProperty),
p->context(), holder, var_unique.value(), p->receiver(),
SmiConstant(on_nonexistent));
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);
// TODO(duongn): use GetPropertyWithReceiver builtin once
// |lookup_element_in_holder| supports elements.
exit_point->ReturnCallRuntime(Runtime::kGetPropertyWithReceiver,
p->context(), holder, p->name(),
p->receiver(), SmiConstant(on_nonexistent));
} else {
exit_point->ReturnCallStub(
Builtins::CallableFor(isolate(), Builtin::kProxyGetProperty),
p->context(), holder, p->name(), p->receiver(),
SmiConstant(on_nonexistent));
}
}
BIND(&global);
{
CSA_DCHECK(this, IsPropertyCell(CAST(holder)));
// Ensure the property cell doesn't contain the hole.
TNode<Object> value =
LoadObjectField(CAST(holder), PropertyCell::kValueOffset);
TNode<Uint32T> details = Unsigned(LoadAndUntagToWord32ObjectField(
CAST(holder), PropertyCell::kPropertyDetailsRawOffset));
GotoIf(IsTheHole(value), miss);
exit_point->Return(CallGetterIfAccessor(value, CAST(holder), details,
p->context(), p->receiver(),
p->name(), miss));
}
BIND(&interceptor);
{
Comment("load_interceptor");
exit_point->ReturnCallRuntime(Runtime::kLoadPropertyWithInterceptor,
p->context(), p->name(), p->receiver(),
holder, p->slot(), p->vector());
}
BIND(&slow);
{
Comment("load_slow");
if (ic_mode == ICMode::kGlobalIC) {
exit_point->ReturnCallRuntime(Runtime::kLoadGlobalIC_Slow, p->context(),
p->name(), p->slot(), p->vector());
} else {
exit_point->ReturnCallRuntime(Runtime::kGetProperty, p->context(),
p->lookup_start_object(), p->name(),
p->receiver());
}
}
BIND(&module_export);
{
Comment("module export");
TNode<UintPtrT> index =
DecodeWordFromWord32<LoadHandler::ExportsIndexBits>(handler_word);
TNode<Module> module =
LoadObjectField<Module>(CAST(holder), JSModuleNamespace::kModuleOffset);
TNode<ObjectHashTable> exports =
LoadObjectField<ObjectHashTable>(module, Module::kExportsOffset);
TNode<Cell> cell = CAST(LoadFixedArrayElement(exports, index));
// The handler is only installed for exports that exist.
TNode<Object> value = LoadCellValue(cell);
Label is_the_hole(this, Label::kDeferred);
GotoIf(IsTheHole(value), &is_the_hole);
exit_point->Return(value);
BIND(&is_the_hole);
{
TNode<Smi> 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()));
}
void AccessorAssembler::HandleLoadICSmiHandlerHasNamedCase(
const LazyLoadICParameters* p, TNode<Object> holder,
TNode<Uint32T> handler_kind, Label* miss, ExitPoint* exit_point,
ICMode ic_mode) {
Label return_true(this), return_false(this), return_lookup(this),
normal(this), global(this), slow(this);
GotoIf(Word32Equal(handler_kind, LOAD_KIND(kField)), &return_true);
GotoIf(Word32Equal(handler_kind, LOAD_KIND(kConstantFromPrototype)),
&return_true);
GotoIf(Word32Equal(handler_kind, LOAD_KIND(kNonExistent)), &return_false);
GotoIf(Word32Equal(handler_kind, LOAD_KIND(kNormal)), &normal);
GotoIf(Word32Equal(handler_kind, LOAD_KIND(kAccessorFromPrototype)),
&return_true);
GotoIf(Word32Equal(handler_kind, LOAD_KIND(kNativeDataProperty)),
&return_true);
GotoIf(Word32Equal(handler_kind, LOAD_KIND(kApiGetter)), &return_true);
GotoIf(Word32Equal(handler_kind, LOAD_KIND(kApiGetterHolderIsPrototype)),
&return_true);
GotoIf(Word32Equal(handler_kind, LOAD_KIND(kSlow)), &slow);
Branch(Word32Equal(handler_kind, LOAD_KIND(kGlobal)), &global,
&return_lookup);
BIND(&return_true);
exit_point->Return(TrueConstant());
BIND(&return_false);
exit_point->Return(FalseConstant());
BIND(&return_lookup);
{
CSA_DCHECK(this,
Word32Or(Word32Equal(handler_kind, LOAD_KIND(kInterceptor)),
Word32Or(Word32Equal(handler_kind, LOAD_KIND(kProxy)),
Word32Equal(handler_kind,
LOAD_KIND(kModuleExport)))));
exit_point->ReturnCallStub(
Builtins::CallableFor(isolate(), Builtin::kHasProperty), p->context(),
p->receiver(), p->name());
}
BIND(&normal);
{
Comment("has_normal");
TNode<PropertyDictionary> properties =
CAST(LoadSlowProperties(CAST(holder)));
TVARIABLE(IntPtrT, var_name_index);
Label found(this);
NameDictionaryLookup<PropertyDictionary>(properties, CAST(p->name()),
&found, &var_name_index, miss);
BIND(&found);
exit_point->Return(TrueConstant());
}
BIND(&global);
{
CSA_DCHECK(this, IsPropertyCell(CAST(holder)));
// Ensure the property cell doesn't contain the hole.
TNode<Object> value =
LoadObjectField(CAST(holder), PropertyCell::kValueOffset);
GotoIf(IsTheHole(value), miss);
exit_point->Return(TrueConstant());
}
BIND(&slow);
{
Comment("load_slow");
if (ic_mode == ICMode::kGlobalIC) {
exit_point->ReturnCallRuntime(Runtime::kLoadGlobalIC_Slow, p->context(),
p->name(), p->slot(), p->vector());
} else {
exit_point->ReturnCallRuntime(Runtime::kHasProperty, p->context(),
p->receiver(), p->name());
}
}
}
// 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 lookup start object if
// ICHandler::DoAccessCheckOnLookupStartObjectBits bit is set in the smi
// handler.
// 4. Does dictionary lookup on receiver if
// ICHandler::LookupOnLookupStartObjectBits bit is set in the smi handler. If
// |on_found_on_lookup_start_object| 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_lookup_start_object| 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>
TNode<Object> AccessorAssembler::HandleProtoHandler(
const ICParameters* p, TNode<DataHandler> handler,
const OnCodeHandler& on_code_handler,
const OnFoundOnLookupStartObject& on_found_on_lookup_start_object,
Label* miss, ICMode ic_mode) {
//
// Check prototype validity cell.
//
{
TNode<Object> maybe_validity_cell =
LoadObjectField(handler, ICHandler::kValidityCellOffset);
CheckPrototypeValidityCell(maybe_validity_cell, miss);
}
//
// Check smi handler bits.
//
{
TNode<Object> 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);
TNode<Code> code = CAST(smi_or_code_handler);
on_code_handler(code);
BIND(&if_smi_handler);
}
TNode<IntPtrT> handler_flags = SmiUntag(CAST(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::LookupOnLookupStartObjectBits::kMask |
ICHandler::DoAccessCheckOnLookupStartObjectBits::kMask;
if (ic_mode == ICMode::kGlobalIC) {
CSA_DCHECK(this, IsClearWord(handler_flags, mask));
} else {
DCHECK_EQ(ICMode::kNonGlobalIC, ic_mode);
Label done(this), if_do_access_check(this),
if_lookup_on_lookup_start_object(this);
GotoIf(IsClearWord(handler_flags, mask), &done);
// Only one of the bits can be set at a time.
CSA_DCHECK(this,
WordNotEqual(WordAnd(handler_flags, IntPtrConstant(mask)),
IntPtrConstant(mask)));
Branch(
IsSetWord<typename ICHandler::DoAccessCheckOnLookupStartObjectBits>(
handler_flags),
&if_do_access_check, &if_lookup_on_lookup_start_object);
BIND(&if_do_access_check);
{
TNode<MaybeObject> data2 = LoadHandlerDataField(handler, 2);
CSA_DCHECK(this, IsWeakOrCleared(data2));
TNode<Context> expected_native_context =
CAST(GetHeapObjectAssumeWeak(data2, miss));
EmitAccessCheck(expected_native_context, p->context(),
p->lookup_start_object(), &done, miss);
}
BIND(&if_lookup_on_lookup_start_object);
{
// Dictionary lookup on lookup start object is not necessary for
// Load/StoreGlobalIC (which is the only case when the
// lookup_start_object can be a JSGlobalObject) because prototype
// validity cell check already guards modifications of the global
// object.
CSA_DCHECK(this,
Word32BinaryNot(HasInstanceType(
CAST(p->lookup_start_object()), JS_GLOBAL_OBJECT_TYPE)));
TNode<PropertyDictionary> properties =
CAST(LoadSlowProperties(CAST(p->lookup_start_object())));
TVARIABLE(IntPtrT, var_name_index);
Label found(this, &var_name_index);
NameDictionaryLookup<PropertyDictionary>(
properties, CAST(p->name()), &found, &var_name_index, &done);
BIND(&found);
{
if (on_found_on_lookup_start_object) {
on_found_on_lookup_start_object(properties, var_name_index.value());
} else {
Goto(miss);
}
}
}
BIND(&done);
}
return smi_or_code_handler;
}
}
void AccessorAssembler::HandleLoadICProtoHandler(
const LazyLoadICParameters* p, TNode<DataHandler> handler,
TVariable<Object>* var_holder, TVariable<MaybeObject>* var_smi_handler,
Label* if_smi_handler, Label* miss, ExitPoint* exit_point, ICMode ic_mode,
LoadAccessMode access_mode) {
TNode<Smi> smi_handler = CAST(HandleProtoHandler<LoadHandler>(
p, handler,
// Code sub-handlers are not expected in LoadICs, so no |on_code_handler|.
nullptr,
// on_found_on_lookup_start_object
[=](TNode<PropertyDictionary> properties, TNode<IntPtrT> name_index) {
if (access_mode == LoadAccessMode::kHas) {
exit_point->Return(TrueConstant());
} else {
TVARIABLE(Uint32T, var_details);
TVARIABLE(Object, var_value);
LoadPropertyFromDictionary<PropertyDictionary>(
properties, name_index, &var_details, &var_value);
TNode<Object> value = CallGetterIfAccessor(
var_value.value(), CAST(var_holder->value()), var_details.value(),
p->context(), p->receiver(), p->name(), miss);
exit_point->Return(value);
}
},
miss, ic_mode));
TNode<MaybeObject> maybe_holder_or_constant =
LoadHandlerDataField(handler, 1);
Label load_from_cached_holder(this), is_smi(this), done(this);
GotoIf(TaggedIsSmi(maybe_holder_or_constant), &is_smi);
Branch(TaggedEqual(maybe_holder_or_constant, NullConstant()), &done,
&load_from_cached_holder);
BIND(&is_smi);
{
// If the "maybe_holder_or_constant" in the handler is a smi, then it's
// guaranteed that it's not a holder object, but a constant value.
CSA_DCHECK(this, Word32Equal(DecodeWord32<LoadHandler::KindBits>(
SmiToInt32(smi_handler)),
LOAD_KIND(kConstantFromPrototype)));
if (access_mode == LoadAccessMode::kHas) {
exit_point->Return(TrueConstant());
} else {
exit_point->Return(CAST(maybe_holder_or_constant));
}
}
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, |maybe_holder| may
// be cleared.
CSA_DCHECK(this, IsWeakOrCleared(maybe_holder_or_constant));
TNode<HeapObject> holder =
GetHeapObjectAssumeWeak(maybe_holder_or_constant, miss);
*var_holder = holder;
Goto(&done);
}
BIND(&done);
{
*var_smi_handler = smi_handler;
Goto(if_smi_handler);
}
}
void AccessorAssembler::EmitAccessCheck(TNode<Context> expected_native_context,
TNode<Context> context,
TNode<Object> receiver,
Label* can_access, Label* miss) {
CSA_DCHECK(this, IsNativeContext(expected_native_context));
TNode<NativeContext> native_context = LoadNativeContext(context);
GotoIf(TaggedEqual(expected_native_context, native_context), can_access);
// If the receiver is not a JSGlobalProxy then we miss.
GotoIf(TaggedIsSmi(receiver), miss);
GotoIfNot(IsJSGlobalProxy(CAST(receiver)), miss);
// For JSGlobalProxy receiver try to compare security tokens of current
// and expected native contexts.
TNode<Object> expected_token = LoadContextElement(
expected_native_context, Context::SECURITY_TOKEN_INDEX);
TNode<Object> current_token =
LoadContextElement(native_context, Context::SECURITY_TOKEN_INDEX);
Branch(TaggedEqual(expected_token, current_token), can_access, miss);
}
void AccessorAssembler::JumpIfDataProperty(TNode<Uint32T> details,
Label* writable, Label* readonly) {
if (readonly) {
// Accessor properties never have the READ_ONLY attribute set.
GotoIf(IsSetWord32(details, PropertyDetails::kAttributesReadOnlyMask),
readonly);
} else {
CSA_DCHECK(this, IsNotSetWord32(details,
PropertyDetails::kAttributesReadOnlyMask));
}
TNode<Uint32T> kind = DecodeWord32<PropertyDetails::KindField>(details);
GotoIf(
Word32Equal(kind, Int32Constant(static_cast<int>(PropertyKind::kData))),
writable);
// Fall through if it's an accessor property.
}
void AccessorAssembler::HandleStoreICNativeDataProperty(
const StoreICParameters* p, TNode<HeapObject> holder,
TNode<Word32T> handler_word) {
Comment("native_data_property_store");
TNode<IntPtrT> descriptor =
Signed(DecodeWordFromWord32<StoreHandler::DescriptorBits>(handler_word));
TNode<AccessorInfo> accessor_info =
CAST(LoadDescriptorValue(LoadMap(holder), descriptor));
TailCallRuntime(Runtime::kStoreCallbackProperty, p->context(), p->receiver(),
holder, accessor_info, p->name(), p->value());
}
void AccessorAssembler::HandleStoreICSmiHandlerJSSharedStructFieldCase(
TNode<Context> context, TNode<Word32T> handler_word, TNode<JSObject> holder,
TNode<Object> value) {
CSA_DCHECK(this,
Word32Equal(DecodeWord32<StoreHandler::KindBits>(handler_word),
STORE_KIND(kSharedStructField)));
CSA_DCHECK(
this,
Word32Equal(DecodeWord32<StoreHandler::RepresentationBits>(handler_word),
Int32Constant(Representation::kTagged)));
TVARIABLE(Object, shared_value, value);
SharedValueBarrier(context, &shared_value);
TNode<BoolT> is_inobject =
IsSetWord32<StoreHandler::IsInobjectBits>(handler_word);
TNode<HeapObject> property_storage = Select<HeapObject>(
is_inobject, [&]() { return holder; },
[&]() { return LoadFastProperties(holder); });
TNode<UintPtrT> index =
DecodeWordFromWord32<StoreHandler::FieldIndexBits>(handler_word);
TNode<IntPtrT> offset = Signed(TimesTaggedSize(index));
StoreSharedObjectField(property_storage, offset, shared_value.value());
// Return the original value.
Return(value);
}
void AccessorAssembler::HandleStoreICHandlerCase(
const StoreICParameters* p, TNode<MaybeObject> handler, Label* miss,
ICMode ic_mode, ElementSupport support_elements) {
Label if_smi_handler(this), if_nonsmi_handler(this);
Label if_proto_handler(this), call_handler(this),
store_transition_or_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);
{
TNode<Object> holder = p->receiver();
TNode<Int32T> handler_word = SmiToInt32(CAST(handler));
Label if_fast_smi(this), if_proxy(this), if_interceptor(this),
if_slow(this);
#define ASSERT_CONSECUTIVE(a, b) \
static_assert(static_cast<intptr_t>(StoreHandler::Kind::a) + 1 == \
static_cast<intptr_t>(StoreHandler::Kind::b));
ASSERT_CONSECUTIVE(kGlobalProxy, kNormal)
ASSERT_CONSECUTIVE(kNormal, kInterceptor)
ASSERT_CONSECUTIVE(kInterceptor, kSlow)
ASSERT_CONSECUTIVE(kSlow, kProxy)
ASSERT_CONSECUTIVE(kProxy, kKindsNumber)
#undef ASSERT_CONSECUTIVE
TNode<Uint32T> handler_kind =
DecodeWord32<StoreHandler::KindBits>(handler_word);
GotoIf(Int32LessThan(handler_kind, STORE_KIND(kGlobalProxy)), &if_fast_smi);
GotoIf(Word32Equal(handler_kind, STORE_KIND(kProxy)), &if_proxy);
GotoIf(Word32Equal(handler_kind, STORE_KIND(kInterceptor)),
&if_interceptor);
GotoIf(Word32Equal(handler_kind, STORE_KIND(kSlow)), &if_slow);
CSA_DCHECK(this, Word32Equal(handler_kind, STORE_KIND(kNormal)));
TNode<PropertyDictionary> properties =
CAST(LoadSlowProperties(CAST(holder)));
TVARIABLE(IntPtrT, var_name_index);
Label dictionary_found(this, &var_name_index);
if (p->IsAnyDefineOwn()) {
NameDictionaryLookup<PropertyDictionary>(properties, CAST(p->name()),
&if_slow, nullptr, miss);
} else {
NameDictionaryLookup<PropertyDictionary>(properties, CAST(p->name()),
&dictionary_found,
&var_name_index, miss);
}
// When dealing with class fields defined with DefineKeyedOwnIC or
// DefineNamedOwnIC, use the slow path to check the existing property.
if (!p->IsAnyDefineOwn()) {
BIND(&dictionary_found);
{
Label if_constant(this), done(this);
TNode<Uint32T> details =
LoadDetailsByKeyIndex(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(static_cast<int>(PropertyKind::kData) == 0);
GotoIf(IsSetWord32(details, kTypeAndReadOnlyMask), miss);
if (V8_DICT_PROPERTY_CONST_TRACKING_BOOL) {
GotoIf(IsPropertyDetailsConst(details), miss);
}
StoreValueByKeyIndex<PropertyDictionary>(
properties, var_name_index.value(), p->value());
Return(p->value());
}
}
BIND(&if_fast_smi);
{
Label data(this), accessor(this), shared_struct_field(this),
native_data_property(this);
GotoIf(Word32Equal(handler_kind, STORE_KIND(kAccessor)), &accessor);
GotoIf(Word32Equal(handler_kind, STORE_KIND(kNativeDataProperty)),
&native_data_property);
Branch(Word32Equal(handler_kind, STORE_KIND(kSharedStructField)),
&shared_struct_field, &data);
BIND(&accessor);
HandleStoreAccessor(p, CAST(holder), handler_word);
BIND(&native_data_property);
HandleStoreICNativeDataProperty(p, CAST(holder), handler_word);
BIND(&shared_struct_field);
HandleStoreICSmiHandlerJSSharedStructFieldCase(p->context(), handler_word,
CAST(holder), p->value());
BIND(&data);
// Handle non-transitioning field stores.
HandleStoreICSmiHandlerCase(handler_word, CAST(holder), p->value(), miss);
}
BIND(&if_proxy);
{
CSA_DCHECK(this, BoolConstant(!p->IsDefineKeyedOwn()));
HandleStoreToProxy(p, CAST(holder), miss, support_elements);
}
BIND(&if_interceptor);
{
Comment("store_interceptor");
TailCallRuntime(Runtime::kStorePropertyWithInterceptor, p->context(),
p->value(), p->receiver(), p->name());
}
BIND(&if_slow);
{
Comment("store_slow");
// The slow case calls into the runtime to complete the store without
// causing an IC miss that would otherwise cause a transition to the
// generic stub.
if (ic_mode == ICMode::kGlobalIC) {
TailCallRuntime(Runtime::kStoreGlobalIC_Slow, p->context(), p->value(),
p->slot(), p->vector(), p->receiver(), p->name());
} else {
Runtime::FunctionId id;
if (p->IsDefineNamedOwn()) {
id = Runtime::kDefineNamedOwnIC_Slow;
} else if (p->IsDefineKeyedOwn()) {
id = Runtime::kDefineKeyedOwnIC_Slow;
} else {
id = Runtime::kKeyedStoreIC_Slow;
}
TailCallRuntime(id, p->context(), p->value(), p->receiver(), p->name());
}
}
}
BIND(&if_nonsmi_handler);
{
TNode<HeapObjectReference> ref_handler = CAST(handler);
GotoIf(IsWeakOrCleared(ref_handler), &store_transition_or_global);
TNode<HeapObject> strong_handler = CAST(handler);
TNode<Map> handler_map = LoadMap(strong_handler);
Branch(IsCodeMap(handler_map), &call_handler, &if_proto_handler);
BIND(&if_proto_handler);
{
HandleStoreICProtoHandler(p, CAST(strong_handler), miss, ic_mode,
support_elements);
}
// |handler| is a heap object. Must be code, call it.
BIND(&call_handler);
{
TNode<Code> code_handler = CAST(strong_handler);
TailCallStub(StoreWithVectorDescriptor{}, code_handler, p->context(),
p->receiver(), p->name(), p->value(), p->slot(),
p->vector());
}
}
BIND(&store_transition_or_global);
{
// Load value or miss if the {handler} weak cell is cleared.
CSA_DCHECK(this, IsWeakOrCleared(handler));
TNode<HeapObject> map_or_property_cell =
GetHeapObjectAssumeWeak(handler, miss);
Label store_global(this), store_transition(this);
Branch(IsMap(map_or_property_cell), &store_transition, &store_global);
BIND(&store_global);
{
TNode<PropertyCell> property_cell = CAST(map_or_property_cell);
ExitPoint direct_exit(this);
// StoreGlobalIC_PropertyCellCase doesn't properly handle private names
// but they are not expected here anyway.
CSA_DCHECK(this, BoolConstant(!p->IsDefineKeyedOwn()));
StoreGlobalIC_PropertyCellCase(property_cell, p->value(), &direct_exit,
miss);
}
BIND(&store_transition);
{
TNode<Map> map = CAST(map_or_property_cell);
HandleStoreICTransitionMapHandlerCase(p, map, miss,
p->IsAnyDefineOwn()
? kDontCheckPrototypeValidity
: kCheckPrototypeValidity);
Return(p->value());
}
}
}
void AccessorAssembler::HandleStoreICTransitionMapHandlerCase(
const StoreICParameters* p, TNode<Map> transition_map, Label* miss,
StoreTransitionMapFlags flags) {
DCHECK_EQ(0, flags & ~kStoreTransitionMapFlagsMask);
if (flags & kCheckPrototypeValidity) {
TNode<Object> maybe_validity_cell =
LoadObjectField(transition_map, Map::kPrototypeValidityCellOffset);
CheckPrototypeValidityCell(maybe_validity_cell, miss);
}
TNode<Uint32T> bitfield3 = LoadMapBitField3(transition_map);
CSA_DCHECK(this, IsClearWord32<Map::Bits3::IsDictionaryMapBit>(bitfield3));
GotoIf(IsSetWord32<Map::Bits3::IsDeprecatedBit>(bitfield3), miss);
// Load last descriptor details.
TNode<UintPtrT> nof =
DecodeWordFromWord32<Map::Bits3::NumberOfOwnDescriptorsBits>(bitfield3);
CSA_DCHECK(this, WordNotEqual(nof, IntPtrConstant(0)));
TNode<DescriptorArray> descriptors = LoadMapDescriptors(transition_map);
TNode<IntPtrT> factor = IntPtrConstant(DescriptorArray::kEntrySize);
TNode<IntPtrT> last_key_index = UncheckedCast<IntPtrT>(IntPtrAdd(
IntPtrConstant(DescriptorArray::ToKeyIndex(-1)), IntPtrMul(nof, factor)));
if (flags & kValidateTransitionHandler) {
TNode<Name> key = LoadKeyByKeyIndex(descriptors, last_key_index);
GotoIf(TaggedNotEqual(key, p->name()), miss);
} else {
CSA_DCHECK(this, TaggedEqual(LoadKeyByKeyIndex(descriptors, last_key_index),
p->name()));
}
TNode<Uint32T> details = LoadDetailsByKeyIndex(descriptors, last_key_index);
if (flags & kValidateTransitionHandler) {
// Follow transitions only in the following cases:
// 1) name is a non-private symbol and attributes equal to NONE,
// 2) name is a private symbol and attributes equal to DONT_ENUM.
Label attributes_ok(this);
const int kKindAndAttributesDontDeleteReadOnlyMask =
PropertyDetails::KindField::kMask |
PropertyDetails::kAttributesDontDeleteMask |
PropertyDetails::kAttributesReadOnlyMask;
static_assert(static_cast<int>(PropertyKind::kData) == 0);
// Both DontDelete and ReadOnly attributes must not be set and it has to be
// a kData property.
GotoIf(IsSetWord32(details, kKindAndAttributesDontDeleteReadOnlyMask),
miss);
// DontEnum attribute is allowed only for private symbols and vice versa.
Branch(Word32Equal(
IsSetWord32(details, PropertyDetails::kAttributesDontEnumMask),
IsPrivateSymbol(CAST(p->name()))),
&attributes_ok, miss);
BIND(&attributes_ok);
}
OverwriteExistingFastDataProperty(CAST(p->receiver()), transition_map,
descriptors, last_key_index, details,
p->value(), miss, true);
}
void AccessorAssembler::UpdateMayHaveInterestingSymbol(
TNode<PropertyDictionary> dict, TNode<Name> name) {
Comment("UpdateMayHaveInterestingSymbol");
Label done(this);
if constexpr (V8_ENABLE_SWISS_NAME_DICTIONARY_BOOL) {
// TODO(pthier): Add flags to swiss dictionaries.
Goto(&done);
} else {
GotoIfNot(IsSymbol(name), &done);
TNode<Uint32T> symbol_flags =
LoadObjectField<Uint32T>(name, Symbol::kFlagsOffset);
GotoIfNot(IsSetWord32<Symbol::IsInterestingSymbolBit>(symbol_flags), &done);
TNode<Smi> flags = GetNameDictionaryFlags(dict);
flags = SmiOr(
flags, SmiConstant(
NameDictionary::MayHaveInterestingSymbolsBit::encode(true)));
SetNameDictionaryFlags(dict, flags);
Goto(&done);
}
BIND(&done);
}
void AccessorAssembler::CheckFieldType(TNode<DescriptorArray> descriptors,
TNode<IntPtrT> name_index,
TNode<Word32T> representation,
TNode<Object> value, Label* bailout) {
Label r_smi(this), r_double(this), r_heapobject(this), all_fine(this);
GotoIf(Word32Equal(representation, Int32Constant(Representation::kSmi)),
&r_smi);
GotoIf(Word32Equal(representation, Int32Constant(Representation::kDouble)),
&r_double);
GotoIf(
Word32Equal(representation, Int32Constant(Representation::kHeapObject)),
&r_heapobject);
GotoIf(Word32Equal(representation, Int32Constant(Representation::kNone)),
bailout);
CSA_DCHECK(this, Word32Equal(representation,
Int32Constant(Representation::kTagged)));
Goto(&all_fine);
BIND(&r_smi);
{ Branch(TaggedIsSmi(value), &all_fine, bailout); }
BIND(&r_double);
{
GotoIf(TaggedIsSmi(value), &all_fine);
Branch(IsHeapNumber(CAST(value)), &all_fine, bailout);
}
BIND(&r_heapobject);
{
GotoIf(TaggedIsSmi(value), bailout);
TNode<MaybeObject> field_type =
LoadFieldTypeByKeyIndex(descriptors, name_index);
const Address kNoneType = FieldType::None().ptr();
const Address kAnyType = FieldType::Any().ptr();
DCHECK_NE(static_cast<uint32_t>(kNoneType), kClearedWeakHeapObjectLower32);
DCHECK_NE(static_cast<uint32_t>(kAnyType), kClearedWeakHeapObjectLower32);
// FieldType::None can't hold any value.
GotoIf(
TaggedEqual(field_type, BitcastWordToTagged(IntPtrConstant(kNoneType))),
bailout);
// FieldType::Any can hold any value.
GotoIf(
TaggedEqual(field_type, BitcastWordToTagged(IntPtrConstant(kAnyType))),
&all_fine);
// Cleared weak references count as FieldType::None, which can't hold any
// value.
TNode<Map> field_type_map =
CAST(GetHeapObjectAssumeWeak(field_type, bailout));
// FieldType::Class(...) performs a map check.
Branch(TaggedEqual(LoadMap(CAST(value)), field_type_map), &all_fine,
bailout);
}
BIND(&all_fine);
}
TNode<BoolT> AccessorAssembler::IsPropertyDetailsConst(TNode<Uint32T> details) {
return Word32Equal(
DecodeWord32<PropertyDetails::ConstnessField>(details),
Int32Constant(static_cast<int32_t>(PropertyConstness::kConst)));
}
void AccessorAssembler::OverwriteExistingFastDataProperty(
TNode<HeapObject> object, TNode<Map> object_map,
TNode<DescriptorArray> descriptors, TNode<IntPtrT> descriptor_name_index,
TNode<Uint32T> details, TNode<Object> value, Label* slow,
bool do_transitioning_store) {
Label done(this), if_field(this), if_descriptor(this);
CSA_DCHECK(this,
Word32Equal(DecodeWord32<PropertyDetails::KindField>(details),
Int32Constant(static_cast<int>(PropertyKind::kData))));
Branch(Word32Equal(
DecodeWord32<PropertyDetails::LocationField>(details),
Int32Constant(static_cast<int32_t>(PropertyLocation::kField))),
&if_field, &if_descriptor);
BIND(&if_field);
{
TNode<Uint32T> representation =
DecodeWord32<PropertyDetails::RepresentationField>(details);
CheckFieldType(descriptors, descriptor_name_index, representation, value,
slow);
TNode<UintPtrT> field_index =
DecodeWordFromWord32<PropertyDetails::FieldIndexField>(details);
field_index = Unsigned(
IntPtrAdd(field_index,
Unsigned(LoadMapInobjectPropertiesStartInWords(object_map))));
TNode<IntPtrT> instance_size_in_words =
LoadMapInstanceSizeInWords(object_map);
Label inobject(this), backing_store(this);
Branch(UintPtrLessThan(field_index, instance_size_in_words), &inobject,
&backing_store);
BIND(&inobject);
{
TNode<IntPtrT> field_offset = Signed(TimesTaggedSize(field_index));
Label tagged_rep(this), double_rep(this);
Branch(
Word32Equal(representation, Int32Constant(Representation::kDouble)),
&double_rep, &tagged_rep);
BIND(&double_rep);
{
TNode<Float64T> double_value = ChangeNumberToFloat64(CAST(value));
if (do_transitioning_store) {
TNode<HeapNumber> heap_number =
AllocateHeapNumberWithValue(double_value);
StoreMap(object, object_map);
StoreObjectField(object, field_offset, heap_number);
} else {
GotoIf(IsPropertyDetailsConst(details), slow);
TNode<HeapNumber> heap_number =
CAST(LoadObjectField(object, field_offset));
StoreHeapNumberValue(heap_number, double_value);
}
Goto(&done);
}
BIND(&tagged_rep);
{
if (do_transitioning_store) {
StoreMap(object, object_map);
} else {
GotoIf(IsPropertyDetailsConst(details), slow);
}
StoreObjectField(object, field_offset, value);
Goto(&done);
}
}
BIND(&backing_store);
{
TNode<IntPtrT> backing_store_index =
Signed(IntPtrSub(field_index, instance_size_in_words));
if (do_transitioning_store) {
// Allocate mutable heap number before extending properties backing
// store to ensure that heap verifier will not see the heap in
// inconsistent state.
TVARIABLE(Object, var_value, value);
{
Label cont(this);
GotoIf(Word32NotEqual(representation,
Int32Constant(Representation::kDouble)),
&cont);
{
TNode<Float64T> double_value = ChangeNumberToFloat64(CAST(value));
TNode<HeapNumber> heap_number =
AllocateHeapNumberWithValue(double_value);
var_value = heap_number;
Goto(&cont);
}
BIND(&cont);
}
TNode<PropertyArray> properties =
ExtendPropertiesBackingStore(object, backing_store_index);
StorePropertyArrayElement(properties, backing_store_index,
var_value.value());
StoreMap(object, object_map);
Goto(&done);
} else {
Label tagged_rep(this), double_rep(this);
TNode<PropertyArray> properties =
CAST(LoadFastProperties(CAST(object)));
Branch(
Word32Equal(representation, Int32Constant(Representation::kDouble)),
&double_rep, &tagged_rep);
BIND(&double_rep);
{
GotoIf(IsPropertyDetailsConst(details), slow);
TNode<HeapNumber> heap_number =
CAST(LoadPropertyArrayElement(properties, backing_store_index));
TNode<Float64T> double_value = ChangeNumberToFloat64(CAST(value));
StoreHeapNumberValue(heap_number, double_value);
Goto(&done);
}
BIND(&tagged_rep);
{
GotoIf(IsPropertyDetailsConst(details), slow);
StorePropertyArrayElement(properties, backing_store_index, value);
Goto(&done);
}
}
}
}
BIND(&if_descriptor);
{
// Check that constant matches value.
TNode<Object> constant =
LoadValueByKeyIndex(descriptors, descriptor_name_index);
GotoIf(TaggedNotEqual(value, constant), slow);
if (do_transitioning_store) {
StoreMap(object, object_map);
}
Goto(&done);
}
BIND(&done);
}
void AccessorAssembler::StoreJSSharedStructField(
TNode<Context> context, TNode<HeapObject> shared_struct,
TNode<Map> shared_struct_map, TNode<DescriptorArray> descriptors,
TNode<IntPtrT> descriptor_name_index, TNode<Uint32T> details,
TNode<Object> maybe_local_value) {
CSA_DCHECK(this, IsJSSharedStruct(shared_struct));
Label done(this);
TNode<UintPtrT> field_index =
DecodeWordFromWord32<PropertyDetails::FieldIndexField>(details);
field_index = Unsigned(IntPtrAdd(
field_index,
Unsigned(LoadMapInobjectPropertiesStartInWords(shared_struct_map))));
TNode<IntPtrT> instance_size_in_words =
LoadMapInstanceSizeInWords(shared_struct_map);
TVARIABLE(Object, shared_value, maybe_local_value);
SharedValueBarrier(context, &shared_value);
Label inobject(this), backing_store(this);
Branch(UintPtrLessThan(field_index, instance_size_in_words), &inobject,
&backing_store);
BIND(&inobject);
{
TNode<IntPtrT> field_offset = Signed(TimesTaggedSize(field_index));
StoreSharedObjectField(shared_struct, field_offset, shared_value.value());
Goto(&done);
}
BIND(&backing_store);
{
TNode<IntPtrT> backing_store_index =
Signed(IntPtrSub(field_index, instance_size_in_words));
CSA_DCHECK(
this,
Word32Equal(DecodeWord32<PropertyDetails::RepresentationField>(details),
Int32Constant(Representation::kTagged)));
TNode<PropertyArray> properties =
CAST(LoadFastProperties(CAST(shared_struct)));
StoreJSSharedStructPropertyArrayElement(properties, backing_store_index,
shared_value.value());
Goto(&done);
}
BIND(&done);
}
void AccessorAssembler::CheckPrototypeValidityCell(
TNode<Object> maybe_validity_cell, Label* miss) {
Label done(this);
GotoIf(
TaggedEqual(maybe_validity_cell, SmiConstant(Map::kPrototypeChainValid)),
&done);
CSA_DCHECK(this, TaggedIsNotSmi(maybe_validity_cell));
TNode<Object> cell_value =
LoadObjectField(CAST(maybe_validity_cell), Cell::kValueOffset);
Branch(TaggedEqual(cell_value, SmiConstant(Map::kPrototypeChainValid)), &done,
miss);
BIND(&done);
}
void AccessorAssembler::HandleStoreAccessor(const StoreICParameters* p,
TNode<HeapObject> holder,
TNode<Word32T> handler_word) {
Comment("accessor_store");
TNode<IntPtrT> descriptor =
Signed(DecodeWordFromWord32<StoreHandler::DescriptorBits>(handler_word));
TNode<HeapObject> accessor_pair =
CAST(LoadDescriptorValue(LoadMap(holder), descriptor));
CSA_DCHECK(this, IsAccessorPair(accessor_pair));
TNode<Object> setter =
LoadObjectField(accessor_pair, AccessorPair::kSetterOffset);
CSA_DCHECK(this, Word32BinaryNot(IsTheHole(setter)));
Return(Call(p->context(), setter, p->receiver(), p->value()));
}
void AccessorAssembler::HandleStoreICProtoHandler(
const StoreICParameters* p, TNode<StoreHandler> 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 = [=](TNode<Code> 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);
{
TailCallStub(StoreWithVectorDescriptor{}, code_handler, p->context(),
p->receiver(), p->name(), p->value(), p->slot(),
p->vector());
}
BIND(&if_transitioning_element_store);
{
TNode<MaybeObject> maybe_transition_map =
LoadHandlerDataField(handler, 1);
TNode<Map> transition_map =
CAST(GetHeapObjectAssumeWeak(maybe_transition_map, miss));
GotoIf(IsDeprecatedMap(transition_map), miss);
TailCallStub(StoreTransitionDescriptor{}, code_handler, p->context(),
p->receiver(), p->name(), transition_map, p->value(),
p->slot(), p->vector());
}
};
}
TNode<Object> smi_handler = HandleProtoHandler<StoreHandler>(
p, handler, on_code_handler,
// on_found_on_lookup_start_object
[=](TNode<PropertyDictionary> properties, TNode<IntPtrT> name_index) {
TNode<Uint32T> details = LoadDetailsByKeyIndex(properties, name_index);
// Check that the property is a writable data property (no accessor).
const int kTypeAndReadOnlyMask =
PropertyDetails::KindField::kMask |
PropertyDetails::kAttributesReadOnlyMask;
static_assert(static_cast<int>(PropertyKind::kData) == 0);
GotoIf(IsSetWord32(details, kTypeAndReadOnlyMask), miss);
StoreValueByKeyIndex<PropertyDictionary>(properties, name_index,
p->value());
Return(p->value());
},
miss, ic_mode);
{
Label if_add_normal(this), if_store_global_proxy(this), if_api_setter(this),
if_accessor(this), if_native_data_property(this), if_slow(this);
CSA_DCHECK(this, TaggedIsSmi(smi_handler));
TNode<Int32T> handler_word = SmiToInt32(CAST(smi_handler));
TNode<Uint32T> handler_kind =
DecodeWord32<StoreHandler::KindBits>(handler_word);
GotoIf(Word32Equal(handler_kind, STORE_KIND(kNormal)), &if_add_normal);
GotoIf(Word32Equal(handler_kind, STORE_KIND(kSlow)), &if_slow);
TNode<MaybeObject> maybe_holder = LoadHandlerDataField(handler, 1);
CSA_DCHECK(this, IsWeakOrCleared(maybe_holder));
TNode<HeapObject> holder = GetHeapObjectAssumeWeak(maybe_holder, miss);
GotoIf(Word32Equal(handler_kind, STORE_KIND(kGlobalProxy)),
&if_store_global_proxy);
GotoIf(Word32Equal(handler_kind, STORE_KIND(kAccessor)), &if_accessor);
GotoIf(Word32Equal(handler_kind, STORE_KIND(kNativeDataProperty)),
&if_native_data_property);
GotoIf(Word32Equal(handler_kind, STORE_KIND(kApiSetter)), &if_api_setter);
GotoIf(Word32Equal(handler_kind, STORE_KIND(kApiSetterHolderIsPrototype)),
&if_api_setter);
CSA_DCHECK(this, Word32Equal(handler_kind, STORE_KIND(kProxy)));
HandleStoreToProxy(p, CAST(holder), miss, support_elements);
BIND(&if_slow);
{
Comment("store_slow");
// The slow case calls into the runtime to complete the store without
// causing an IC miss that would otherwise cause a transition to the
// generic stub.
if (ic_mode == ICMode::kGlobalIC) {
TailCallRuntime(Runtime::kStoreGlobalIC_Slow, p->context(), p->value(),
p->slot(), p->vector(), p->receiver(), p->name());
} else if (p->IsAnyDefineOwn()) {
// DefineKeyedOwnIC and DefineNamedOwnIC shouldn't be using slow proto
// handlers, otherwise proper slow function must be called.
CSA_DCHECK(this, BoolConstant(!p->IsAnyDefineOwn()));
Unreachable();
} else {
TailCallRuntime(Runtime::kKeyedStoreIC_Slow, p->context(), p->value(),
p->receiver(), p->name());
}
}
BIND(&if_add_normal);
{
// This is a case of "transitioning store" to a dictionary mode object
// when the property does not exist. The "existing property" case is
// covered above by LookupOnLookupStartObject bit handling of the smi
// handler.
Label slow(this);
TNode<Map> receiver_map = LoadMap(CAST(p->receiver()));
InvalidateValidityCellIfPrototype(receiver_map);
TNode<PropertyDictionary> properties =
CAST(LoadSlowProperties(CAST(p->receiver())));
TNode<Name> name = CAST(p->name());
Add<PropertyDictionary>(properties, name, p->value(), &slow);
UpdateMayHaveInterestingSymbol(properties, name);
Return(p->value());
BIND(&slow);
TailCallRuntime(Runtime::kAddDictionaryProperty, p->context(),
p->receiver(), p->name(), p->value());
}
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_DCHECK(this, TaggedIsNotSmi(handler));
TNode<CallHandlerInfo> call_handler_info = CAST(holder);
// Context is stored either in data2 or data3 field depending on whether
// the access check is enabled for this handler or not.
TNode<MaybeObject> maybe_context = Select<MaybeObject>(
IsSetWord32<StoreHandler::DoAccessCheckOnLookupStartObjectBits>(
handler_word),
[=] { return LoadHandlerDataField(handler, 3); },
[=] { return LoadHandlerDataField(handler, 2); });
CSA_DCHECK(this, IsWeakOrCleared(maybe_context));
TNode<Object> context = Select<Object>(
IsCleared(maybe_context), [=] { return SmiConstant(0); },
[=] { return GetHeapObjectAssumeWeak(maybe_context); });
TNode<RawPtrT> callback =
LoadCallHandlerInfoJsCallbackPtr(call_handler_info);
TNode<Object> data =
LoadObjectField(call_handler_info, CallHandlerInfo::kDataOffset);
TVARIABLE(Object, api_holder, p->receiver());
Label store(this);
GotoIf(Word32Equal(handler_kind, STORE_KIND(kApiSetter)), &store);
CSA_DCHECK(this, Word32Equal(handler_kind,
STORE_KIND(kApiSetterHolderIsPrototype)));
api_holder = LoadMapPrototype(LoadMap(CAST(p->receiver())));
Goto(&store);
BIND(&store);
{
GotoIf(IsSideEffectFreeDebuggingActive(), &if_slow);
TNode<Int32T> argc = Int32Constant(1);
Return(CallApiCallback(context, callback, argc, data,
api_holder.value(), p->receiver(), p->value()));
}
}
BIND(&if_store_global_proxy);
{
ExitPoint direct_exit(this);
// StoreGlobalIC_PropertyCellCase doesn't properly handle private names
// but they are not expected here anyway.
CSA_DCHECK(this, BoolConstant(!p->IsDefineKeyedOwn()));
StoreGlobalIC_PropertyCellCase(CAST(holder), p->value(), &direct_exit,
miss);
}
}
}
void AccessorAssembler::HandleStoreToProxy(const StoreICParameters* p,
TNode<JSProxy> proxy, Label* miss,
ElementSupport support_elements) {
TVARIABLE(IntPtrT, var_index);
TVARIABLE(Name, var_unique);
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);
CallBuiltin(Builtin::kProxySetProperty, p->context(), proxy,
var_unique.value(), p->value(), p->receiver());
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());
} else {
TNode<Object> name = CallBuiltin(Builtin::kToName, p->context(), p->name());
TailCallBuiltin(Builtin::kProxySetProperty, p->context(), proxy, name,
p->value(), p->receiver());
}
}
void AccessorAssembler::HandleStoreICSmiHandlerCase(TNode<Word32T> handler_word,
TNode<JSObject> holder,
TNode<Object> value,
Label* miss) {
Comment("field store");
#ifdef DEBUG
TNode<Uint32T> handler_kind =
DecodeWord32<StoreHandler::KindBits>(handler_word);
CSA_DCHECK(this,
Word32Or(Word32Equal(handler_kind, STORE_KIND(kField)),
Word32Equal(handler_kind, STORE_KIND(kConstField))));
#endif
TNode<Uint32T> field_representation =
DecodeWord32<StoreHandler::RepresentationBits>(handler_word);
Label if_smi_field(this), if_double_field(this), if_heap_object_field(this),
if_tagged_field(this);
int32_t case_values[] = {Representation::kTagged, Representation::kHeapObject,
Representation::kSmi};
Label* case_labels[] = {&if_tagged_field, &if_heap_object_field,
&if_smi_field};
Switch(field_representation, &if_double_field, case_values, case_labels, 3);
BIND(&if_tagged_field);
{
Comment("store tagged field");
HandleStoreFieldAndReturn(handler_word, holder, value, base::nullopt,
Representation::Tagged(), miss);
}
BIND(&if_heap_object_field);
{
Comment("heap object field checks");
CheckHeapObjectTypeMatchesDescriptor(handler_word, holder, value, miss);
Comment("store heap object field");
HandleStoreFieldAndReturn(handler_word, holder, value, base::nullopt,
Representation::HeapObject(), miss);
}
BIND(&if_smi_field);
{
Comment("smi field checks");
GotoIfNot(TaggedIsSmi(value), miss);
Comment("store smi field");
HandleStoreFieldAndReturn(handler_word, holder, value, base::nullopt,
Representation::Smi(), miss);
}
BIND(&if_double_field);
{
CSA_DCHECK(this, Word32Equal(field_representation,
Int32Constant(Representation::kDouble)));
Comment("double field checks");
TNode<Float64T> double_value = TryTaggedToFloat64(value, miss);
CheckDescriptorConsidersNumbersMutable(handler_word, holder, miss);
Comment("store double field");
HandleStoreFieldAndReturn(handler_word, holder, value, double_value,
Representation::Double(), miss);
}
}
void AccessorAssembler::CheckHeapObjectTypeMatchesDescriptor(
TNode<Word32T> handler_word, TNode<JSObject> holder, TNode<Object> value,
Label* bailout) {
GotoIf(TaggedIsSmi(value), bailout);
Label done(this);
// Skip field type check in favor of constant value check when storing
// to constant field.
GotoIf(Word32Equal(DecodeWord32<StoreHandler::KindBits>(handler_word),
STORE_KIND(kConstField)),
&done);
TNode<IntPtrT> descriptor =
Signed(DecodeWordFromWord32<StoreHandler::DescriptorBits>(handler_word));
TNode<MaybeObject> maybe_field_type =
LoadDescriptorValueOrFieldType(LoadMap(holder), descriptor);
GotoIf(TaggedIsSmi(maybe_field_type), &done);
// Check that value type matches the field type.
{
TNode<HeapObject> field_type =
GetHeapObjectAssumeWeak(maybe_field_type, bailout);
Branch(TaggedEqual(LoadMap(CAST(value)), field_type), &done, bailout);
}
BIND(&done);
}
void AccessorAssembler::CheckDescriptorConsidersNumbersMutable(
TNode<Word32T> handler_word, TNode<JSObject> holder, Label* bailout) {
// We have to check that the representation is Double. Checking the value
// (either in the field or being assigned) is not enough, as we could have
// transitioned to Tagged but still be holding a HeapNumber, which would no
// longer be allowed to be mutable.
// TODO(leszeks): We could skip the representation check in favor of a
// constant value check in HandleStoreFieldAndReturn here, but then
// HandleStoreFieldAndReturn would need an IsHeapNumber check in case both the
// representation changed and the value is no longer a HeapNumber.
TNode<IntPtrT> descriptor_entry =
Signed(DecodeWordFromWord32<StoreHandler::DescriptorBits>(handler_word));
TNode<DescriptorArray> descriptors = LoadMapDescriptors(LoadMap(holder));
TNode<Uint32T> details =
LoadDetailsByDescriptorEntry(descriptors, descriptor_entry);
GotoIfNot(IsEqualInWord32<PropertyDetails::RepresentationField>(
details, Representation::kDouble),
bailout);
}
void AccessorAssembler::GotoIfNotSameNumberBitPattern(TNode<Float64T> left,
TNode<Float64T> right,
Label* miss) {
// TODO(verwaest): Use a single compare on 64bit archs.
const TNode<Uint32T> lhs_hi = Float64ExtractHighWord32(left);
const TNode<Uint32T> rhs_hi = Float64ExtractHighWord32(right);
GotoIfNot(Word32Equal(lhs_hi, rhs_hi), miss);
const TNode<Uint32T> lhs_lo = Float64ExtractLowWord32(left);
const TNode<Uint32T> rhs_lo = Float64ExtractLowWord32(right);
GotoIfNot(Word32Equal(lhs_lo, rhs_lo), miss);
}
void AccessorAssembler::HandleStoreFieldAndReturn(
TNode<Word32T> handler_word, TNode<JSObject> holder, TNode<Object> value,
base::Optional<TNode<Float64T>> double_value, Representation representation,
Label* miss) {
bool store_value_as_double = representation.IsDouble();
TNode<BoolT> is_inobject =
IsSetWord32<StoreHandler::IsInobjectBits>(handler_word);
TNode<HeapObject> property_storage = Select<HeapObject>(
is_inobject, [&]() { return holder; },
[&]() { return LoadFastProperties(holder); });
TNode<UintPtrT> index =
DecodeWordFromWord32<StoreHandler::FieldIndexBits>(handler_word);
TNode<IntPtrT> offset = Signed(TimesTaggedSize(index));
// For Double fields, we want to mutate the current double-value
// field rather than changing it to point at a new HeapNumber.
if (store_value_as_double) {
TVARIABLE(HeapObject, actual_property_storage, property_storage);
TVARIABLE(IntPtrT, actual_offset, offset);
Label property_and_offset_ready(this);
// Store the double value directly into the mutable HeapNumber.
TNode<Object> field = LoadObjectField(property_storage, offset);
CSA_DCHECK(this, IsHeapNumber(CAST(field)));
actual_property_storage = CAST(field);
actual_offset = IntPtrConstant(HeapNumber::kValueOffset);
Goto(&property_and_offset_ready);
BIND(&property_and_offset_ready);
property_storage = actual_property_storage.value();
offset = actual_offset.value();
}
// Do constant value check if necessary.
Label do_store(this);
GotoIfNot(Word32Equal(DecodeWord32<StoreHandler::KindBits>(handler_word),
STORE_KIND(kConstField)),
&do_store);
{
if (store_value_as_double) {
TNode<Float64T> current_value =
LoadObjectField<Float64T>(property_storage, offset);
GotoIfNotSameNumberBitPattern(current_value, *double_value, miss);
Return(value);
} else {
TNode<Object> current_value = LoadObjectField(property_storage, offset);
GotoIfNot(TaggedEqual(current_value, value), miss);
Return(value);
}
}
BIND(&do_store);
// Do the store.
if (store_value_as_double) {
StoreObjectFieldNoWriteBarrier(property_storage, offset, *double_value);
} else if (representation.IsSmi()) {
TNode<Smi> value_smi = CAST(value);
StoreObjectFieldNoWriteBarrier(property_storage, offset, value_smi);
} else {
StoreObjectField(property_storage, offset, value);
}
Return(value);
}
TNode<PropertyArray> AccessorAssembler::ExtendPropertiesBackingStore(
TNode<HeapObject> object, TNode<IntPtrT> index) {
Comment("[ Extend storage");
TVARIABLE(HeapObject, var_properties);
TVARIABLE(Int32T, var_encoded_hash);
TVARIABLE(IntPtrT, var_length);
TNode<Object> properties =
LoadObjectField(object, JSObject::kPropertiesOrHashOffset);
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);
{
TNode<Int32T> hash = SmiToInt32(CAST(properties));
TNode<Int32T> encoded_hash =
Word32Shl(hash, Int32Constant(PropertyArray::HashField::kShift));
var_encoded_hash = encoded_hash;
var_length = IntPtrConstant(0);
var_properties = EmptyFixedArrayConstant();
Goto(&extend_store);
}
BIND(&if_property_array);
{
var_properties = CAST(properties);
TNode<Int32T> length_and_hash_int32 = LoadAndUntagToWord32ObjectField(
var_properties.value(), PropertyArray::kLengthAndHashOffset);
var_encoded_hash = Word32And(
length_and_hash_int32, Int32Constant(PropertyArray::HashField::kMask));
var_length = ChangeInt32ToIntPtr(
Word32And(length_and_hash_int32,
Int32Constant(PropertyArray::LengthField::kMask)));
Goto(&extend_store);
}
BIND(&extend_store);
{
TVARIABLE(HeapObject, var_new_properties, var_properties.value());
Label done(this);
// 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.
GotoIf(UintPtrLessThan(index, ParameterToIntPtr(var_length.value())),
&done);
TNode<IntPtrT> delta = IntPtrConstant(JSObject::kFieldsAdded);
TNode<IntPtrT> new_capacity = IntPtrAdd(var_length.value(), delta);
// 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_DCHECK(this, IntPtrLessThan(new_capacity,
IntPtrConstant(kMaxNumberOfDescriptors +
JSObject::kFieldsAdded)));
TNode<PropertyArray> new_properties = AllocatePropertyArray(new_capacity);
var_new_properties = new_properties;
FillPropertyArrayWithUndefined(new_properties, var_length.value(),
new_capacity);
// |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,
DestroySource::kYes);
TNode<Int32T> new_capacity_int32 = TruncateIntPtrToInt32(new_capacity);
TNode<Int32T> new_length_and_hash_int32 =
Word32Or(var_encoded_hash.value(), new_capacity_int32);
StoreObjectField(new_properties, PropertyArray::kLengthAndHashOffset,
SmiFromInt32(new_length_and_hash_int32));
StoreObjectField(object, JSObject::kPropertiesOrHashOffset, new_properties);
Comment("] Extend storage");
Goto(&done);
BIND(&done);
return CAST(var_new_properties.value());
}
}
void AccessorAssembler::EmitFastElementsBoundsCheck(
TNode<JSObject> object, TNode<FixedArrayBase> elements,
TNode<IntPtrT> intptr_index, TNode<BoolT> is_jsarray_condition,
Label* miss) {
TVARIABLE(IntPtrT, var_length);
Comment("Fast elements bounds check");
Label if_array(this), length_loaded(this, &var_length);
GotoIf(is_jsarray_condition, &if_array);
{
var_length = SmiUntag(LoadFixedArrayBaseLength(elements));
Goto(&length_loaded);
}
BIND(&if_array);
{
var_length = SmiUntag(LoadFastJSArrayLength(CAST(object)));
Goto(&length_loaded);
}
BIND(&length_loaded);
GotoIfNot(UintPtrLessThan(intptr_index, var_length.value()), miss);
}
void AccessorAssembler::EmitElementLoad(
TNode<HeapObject> object, TNode<Word32T> elements_kind,
TNode<IntPtrT> intptr_index, TNode<BoolT> is_jsarray_condition,
Label* if_hole, Label* rebox_double, TVariable<Float64T>* var_double_value,
Label* unimplemented_elements_kind, Label* out_of_bounds, Label* miss,
ExitPoint* exit_point, LoadAccessMode access_mode) {
Label if_rab_gsab_typed_array(this), if_typed_array(this), if_fast(this),
if_fast_packed(this), if_fast_holey(this), if_fast_double(this),
if_fast_holey_double(this), if_nonfast(this), if_dictionary(this);
Branch(Int32GreaterThan(elements_kind,
Int32Constant(LAST_ANY_NONEXTENSIBLE_ELEMENTS_KIND)),
&if_nonfast, &if_fast);
BIND(&if_fast);
{
TNode<FixedArrayBase> elements = LoadJSObjectElements(CAST(object));
EmitFastElementsBoundsCheck(CAST(object), elements, intptr_index,
is_jsarray_condition, out_of_bounds);
int32_t kinds[] = {
// Handled by if_fast_packed.
PACKED_SMI_ELEMENTS, PACKED_ELEMENTS, PACKED_NONEXTENSIBLE_ELEMENTS,
PACKED_SEALED_ELEMENTS, PACKED_FROZEN_ELEMENTS, SHARED_ARRAY_ELEMENTS,
// Handled by if_fast_holey.
HOLEY_SMI_ELEMENTS, HOLEY_ELEMENTS, HOLEY_NONEXTENSIBLE_ELEMENTS,
HOLEY_FROZEN_ELEMENTS, HOLEY_SEALED_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, &if_fast_packed,
&if_fast_packed, &if_fast_packed, &if_fast_packed,
// FAST_HOLEY_{SMI,}_ELEMENTS
&if_fast_holey, &if_fast_holey, &if_fast_holey,
&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(
access_mode == LoadAccessMode::kHas
? TrueConstant()
: UnsafeLoadFixedArrayElement(CAST(elements), intptr_index));
}
BIND(&if_fast_holey);
{
Comment("fast holey elements");
TNode<Object> element =
UnsafeLoadFixedArrayElement(CAST(elements), intptr_index);
GotoIf(TaggedEqual(element, TheHoleConstant()), if_hole);
exit_point->Return(access_mode == LoadAccessMode::kHas ? TrueConstant()
: element);
}
BIND(&if_fast_double);
{
Comment("packed double elements");
if (access_mode == LoadAccessMode::kHas) {
exit_point->Return(TrueConstant());
} else {
*var_double_value =
LoadFixedDoubleArrayElement(CAST(elements), intptr_index);
Goto(rebox_double);
}
}
BIND(&if_fast_holey_double);
{
Comment("holey double elements");
TNode<Float64T> value =
LoadFixedDoubleArrayElement(CAST(elements), intptr_index, if_hole);
if (access_mode == LoadAccessMode::kHas) {
exit_point->Return(TrueConstant());
} else {
*var_double_value = value;
Goto(rebox_double);
}
}
}
BIND(&if_nonfast);
{
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), bigint64_elements(this),
biguint64_elements(this);
static_assert(LAST_ELEMENTS_KIND ==
LAST_RAB_GSAB_FIXED_TYPED_ARRAY_ELEMENTS_KIND);
GotoIf(Int32GreaterThanOrEqual(
elements_kind,
Int32Constant(FIRST_RAB_GSAB_FIXED_TYPED_ARRAY_ELEMENTS_KIND)),
&if_rab_gsab_typed_array);
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");
if (Is64()) {
GotoIf(UintPtrLessThan(IntPtrConstant(JSObject::kMaxElementIndex),
intptr_index),
out_of_bounds);
} else {
GotoIf(IntPtrLessThan(intptr_index, IntPtrConstant(0)), out_of_bounds);
}
TNode<FixedArrayBase> elements = LoadJSObjectElements(CAST(object));
TNode<Object> value = BasicLoadNumberDictionaryElement(
CAST(elements), intptr_index, miss, if_hole);
exit_point->Return(access_mode == LoadAccessMode::kHas ? TrueConstant()
: value);
}
{
TVARIABLE(RawPtrT, data_ptr);
BIND(&if_rab_gsab_typed_array);
{
Comment("rab gsab typed elements");
Label variable_length(this), normal(this), length_check_ok(this);
TNode<JSTypedArray> array = CAST(object);
TNode<JSArrayBuffer> buffer = LoadJSArrayBufferViewBuffer(array);
// Bounds check (incl. detachedness check).
TNode<UintPtrT> length =
LoadVariableLengthJSTypedArrayLength(array, buffer, miss);
Branch(UintPtrLessThan(intptr_index, length), &length_check_ok,
out_of_bounds);
BIND(&length_check_ok);
{
if (access_mode == LoadAccessMode::kHas) {
exit_point->Return(TrueConstant());
} else {
data_ptr = LoadJSTypedArrayDataPtr(array);
Label* elements_kind_labels[] = {
&uint8_elements, &uint8_elements, &int8_elements,
&uint16_elements, &int16_elements, &uint32_elements,
&int32_elements, &float32_elements, &float64_elements,
&bigint64_elements, &biguint64_elements};
int32_t elements_kinds[] = {
RAB_GSAB_UINT8_ELEMENTS, RAB_GSAB_UINT8_CLAMPED_ELEMENTS,
RAB_GSAB_INT8_ELEMENTS, RAB_GSAB_UINT16_ELEMENTS,
RAB_GSAB_INT16_ELEMENTS, RAB_GSAB_UINT32_ELEMENTS,
RAB_GSAB_INT32_ELEMENTS, RAB_GSAB_FLOAT32_ELEMENTS,
RAB_GSAB_FLOAT64_ELEMENTS, RAB_GSAB_BIGINT64_ELEMENTS,
RAB_GSAB_BIGUINT64_ELEMENTS};
const size_t kTypedElementsKindCount =
LAST_RAB_GSAB_FIXED_TYPED_ARRAY_ELEMENTS_KIND -
FIRST_RAB_GSAB_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(&if_typed_array);
{
Comment("typed elements");
// Check if buffer has been detached.
TNode<JSArrayBuffer> buffer = LoadJSArrayBufferViewBuffer(CAST(object));
GotoIf(IsDetachedBuffer(buffer), miss);
// Bounds check.
TNode<UintPtrT> length = LoadJSTypedArrayLength(CAST(object));
GotoIfNot(UintPtrLessThan(intptr_index, length), out_of_bounds);
if (access_mode == LoadAccessMode::kHas) {
exit_point->Return(TrueConstant());
} else {
data_ptr = LoadJSTypedArrayDataPtr(CAST(object));
Label* elements_kind_labels[] = {
&uint8_elements, &uint8_elements, &int8_elements,
&uint16_elements, &int16_elements, &uint32_elements,
&int32_elements, &float32_elements, &float64_elements,
&bigint64_elements, &biguint64_elements};
int32_t elements_kinds[] = {
UINT8_ELEMENTS, UINT8_CLAMPED_ELEMENTS, INT8_ELEMENTS,
UINT16_ELEMENTS, INT16_ELEMENTS, UINT32_ELEMENTS,
INT32_ELEMENTS, FLOAT32_ELEMENTS, FLOAT64_ELEMENTS,
BIGINT64_ELEMENTS, BIGUINT64_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);
}
}
if (access_mode != LoadAccessMode::kHas) {
BIND(&uint8_elements);
{
Comment("UINT8_ELEMENTS"); // Handles UINT8_CLAMPED_ELEMENTS too.
TNode<Int32T> element = Load<Uint8T>(data_ptr.value(), intptr_index);
exit_point->Return(SmiFromInt32(element));
}
BIND(&int8_elements);
{
Comment("INT8_ELEMENTS");
TNode<Int32T> element = Load<Int8T>(data_ptr.value(), intptr_index);
exit_point->Return(SmiFromInt32(element));
}
BIND(&uint16_elements);
{
Comment("UINT16_ELEMENTS");
TNode<IntPtrT> index = WordShl(intptr_index, IntPtrConstant(1));
TNode<Int32T> element = Load<Uint16T>(data_ptr.value(), index);
exit_point->Return(SmiFromInt32(element));
}
BIND(&int16_elements);
{
Comment("INT16_ELEMENTS");
TNode<IntPtrT> index = WordShl(intptr_index, IntPtrConstant(1));
TNode<Int32T> element = Load<Int16T>(data_ptr.value(), index);
exit_point->Return(SmiFromInt32(element));
}
BIND(&uint32_elements);
{
Comment("UINT32_ELEMENTS");
TNode<IntPtrT> index = WordShl(intptr_index, IntPtrConstant(2));
TNode<Uint32T> element = Load<Uint32T>(data_ptr.value(), index);
exit_point->Return(ChangeUint32ToTagged(element));
}
BIND(&int32_elements);
{
Comment("INT32_ELEMENTS");
TNode<IntPtrT> index = WordShl(intptr_index, IntPtrConstant(2));
TNode<Int32T> element = Load<Int32T>(data_ptr.value(), index);
exit_point->Return(ChangeInt32ToTagged(element));
}
BIND(&float32_elements);
{
Comment("FLOAT32_ELEMENTS");
TNode<IntPtrT> index = WordShl(intptr_index, IntPtrConstant(2));
TNode<Float32T> element = Load<Float32T>(data_ptr.value(), index);
*var_double_value = ChangeFloat32ToFloat64(element);
Goto(rebox_double);
}
BIND(&float64_elements);
{
Comment("FLOAT64_ELEMENTS");
TNode<IntPtrT> index = WordShl(intptr_index, IntPtrConstant(3));
TNode<Float64T> element = Load<Float64T>(data_ptr.value(), index);
*var_double_value = element;
Goto(rebox_double);
}
BIND(&bigint64_elements);
{
Comment("BIGINT64_ELEMENTS");
exit_point->Return(LoadFixedTypedArrayElementAsTagged(
data_ptr.value(), Unsigned(intptr_index), BIGINT64_ELEMENTS));
}
BIND(&biguint64_elements);
{
Comment("BIGUINT64_ELEMENTS");
exit_point->Return(LoadFixedTypedArrayElementAsTagged(
data_ptr.value(), Unsigned(intptr_index), BIGUINT64_ELEMENTS));
}
}
}
}
}
void AccessorAssembler::InvalidateValidityCellIfPrototype(
TNode<Map> map, base::Optional<TNode<Uint32T>> maybe_bitfield3) {
Label is_prototype(this), cont(this);
TNode<Uint32T> bitfield3;
if (bitfield3) {
bitfield3 = maybe_bitfield3.value();
} else {
bitfield3 = LoadMapBitField3(map);
}
Branch(IsSetWord32(bitfield3, Map::Bits3::IsPrototypeMapBit::kMask),
&is_prototype, &cont);
BIND(&is_prototype);
{
TNode<Object> 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);
TNode<ExternalReference> function = ExternalConstant(
ExternalReference::invalidate_prototype_chains_function());
CallCFunction(function, MachineType::AnyTagged(),
std::make_pair(MachineType::AnyTagged(), map));
Goto(&cont);
}
BIND(&cont);
}
void AccessorAssembler::GenericElementLoad(
TNode<HeapObject> lookup_start_object, TNode<Map> lookup_start_object_map,
TNode<Int32T> lookup_start_object_instance_type, TNode<IntPtrT> index,
Label* slow) {
Comment("integer index");
ExitPoint direct_exit(this);
Label if_custom(this), if_element_hole(this), if_oob(this);
Label return_undefined(this);
// Receivers requiring non-standard element accesses (interceptors, access
// checks, strings and string wrappers, proxies) are handled in the runtime.
GotoIf(
IsCustomElementsReceiverInstanceType(lookup_start_object_instance_type),
&if_custom);
TNode<Int32T> elements_kind = LoadMapElementsKind(lookup_start_object_map);
TNode<BoolT> is_jsarray_condition =
IsJSArrayInstanceType(lookup_start_object_instance_type);
TVARIABLE(Float64T, var_double_value);
Label rebox_double(this, &var_double_value);
// Unimplemented elements kinds fall back to a runtime call.
Label* unimplemented_elements_kind = slow;
EmitElementLoad(lookup_start_object, 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");
// On TypedArrays, all OOB loads (positive and negative) return undefined
// without ever checking the prototype chain.
GotoIf(IsJSTypedArrayInstanceType(lookup_start_object_instance_type),
&return_undefined);
// Positive OOB indices within elements index range are effectively the same
// as hole loads. Larger keys and negative keys are named loads.
if (Is64()) {
Branch(UintPtrLessThanOrEqual(index,
IntPtrConstant(JSObject::kMaxElementIndex)),
&if_element_hole, slow);
} else {
Branch(IntPtrLessThan(index, IntPtrConstant(0)), slow, &if_element_hole);
}
}
BIND(&if_element_hole);
{
Comment("found the hole");
BranchIfPrototypesHaveNoElements(lookup_start_object_map, &return_undefined,
slow);
}
BIND(&if_custom);
{
Comment("check if string");
GotoIfNot(IsStringInstanceType(lookup_start_object_instance_type), slow);
Comment("load string character");
TNode<IntPtrT> length = LoadStringLengthAsWord(CAST(lookup_start_object));
GotoIfNot(UintPtrLessThan(index, length), slow);
TailCallBuiltin(Builtin::kStringCharAt, NoContextConstant(),
lookup_start_object, index);
}
BIND(&return_undefined);
Return(UndefinedConstant());
}
void AccessorAssembler::GenericPropertyLoad(
TNode<HeapObject> lookup_start_object, TNode<Map> lookup_start_object_map,
TNode<Int32T> lookup_start_object_instance_type, const LoadICParameters* p,
Label* slow, UseStubCache use_stub_cache) {
DCHECK_EQ(lookup_start_object, p->lookup_start_object());
ExitPoint direct_exit(this);
Comment("key is unique name");
Label if_found_on_lookup_start_object(this), if_property_dictionary(this),
lookup_prototype_chain(this), special_receiver(this);
TVARIABLE(Uint32T, var_details);
TVARIABLE(Object, var_value);
TNode<Name> name = CAST(p->name());
// Receivers requiring non-standard accesses (interceptors, access
// checks, strings and string wrappers) are handled in the runtime.
GotoIf(IsSpecialReceiverInstanceType(lookup_start_object_instance_type),
&special_receiver);
// Check if the lookup_start_object has fast or slow properties.
TNode<Uint32T> bitfield3 = LoadMapBitField3(lookup_start_object_map);
GotoIf(IsSetWord32<Map::Bits3::IsDictionaryMapBit>(bitfield3),
&if_property_dictionary);
{
// Try looking up the property on the lookup_start_object; if unsuccessful,
// look for a handler in the stub cache.
TNode<DescriptorArray> descriptors =
LoadMapDescriptors(lookup_start_object_map);
Label if_descriptor_found(this), try_stub_cache(this);
TVARIABLE(IntPtrT, var_name_index);
Label* notfound = use_stub_cache == kUseStubCache ? &try_stub_cache
: &lookup_prototype_chain;
DescriptorLookup(name, descriptors, bitfield3, &if_descriptor_found,
&var_name_index, notfound);
BIND(&if_descriptor_found);
{
LoadPropertyFromFastObject(lookup_start_object, lookup_start_object_map,
descriptors, var_name_index.value(),
&var_details, &var_value);
Goto(&if_found_on_lookup_start_object);
}
if (use_stub_cache == kUseStubCache) {