/
builtins-collections-gen.cc
1779 lines (1467 loc) · 67.9 KB
/
builtins-collections-gen.cc
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// Copyright 2017 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/builtins/builtins-constructor-gen.h"
#include "src/builtins/builtins-iterator-gen.h"
#include "src/builtins/builtins-utils-gen.h"
#include "src/code-stub-assembler.h"
#include "src/objects/hash-table.h"
namespace v8 {
namespace internal {
using compiler::Node;
class CollectionsBuiltinsAssembler : public CodeStubAssembler {
public:
explicit CollectionsBuiltinsAssembler(compiler::CodeAssemblerState* state)
: CodeStubAssembler(state) {}
protected:
Node* AllocateJSMap(Node* js_map_function);
template <typename CollectionType>
Node* AllocateOrderedHashTable();
Node* AllocateJSCollection(Node* js_map_function);
template <typename IteratorType>
Node* AllocateJSCollectionIterator(Node* context, int map_index,
Node* collection);
Node* GetHash(Node* const key);
Node* CallGetHashRaw(Node* const key);
Node* CallGetOrCreateHashRaw(Node* const key);
// Transitions the iterator to the non obsolete backing store.
// This is a NOP if the [table] is not obsolete.
typedef std::function<void(Node* const table, Node* const index)>
UpdateInTransition;
template <typename TableType>
std::tuple<Node*, Node*> Transition(
Node* const table, Node* const index,
UpdateInTransition const& update_in_transition);
template <typename IteratorType, typename TableType>
std::tuple<Node*, Node*> TransitionAndUpdate(Node* const iterator);
template <typename TableType>
std::tuple<Node*, Node*, Node*> NextSkipHoles(Node* table, Node* index,
Label* if_end);
// Builds code that finds OrderedHashTable entry for a key with hash code
// {hash} with using the comparison code generated by {key_compare}. The code
// jumps to {entry_found} if the key is found, or to {not_found} if the key
// was not found. In the {entry_found} branch, the variable
// entry_start_position will be bound to the index of the entry (relative to
// OrderedHashTable::kHashTableStartIndex).
//
// The {CollectionType} template parameter stands for the particular instance
// of OrderedHashTable, it should be OrderedHashMap or OrderedHashSet.
template <typename CollectionType>
void FindOrderedHashTableEntry(
Node* table, Node* hash,
std::function<void(Node* other, Label* if_same, Label* if_not_same)>
key_compare,
Variable* entry_start_position, Label* entry_found, Label* not_found);
// Specialization for Smi.
// The {result} variable will contain the entry index if the key was found,
// or the hash code otherwise.
template <typename CollectionType>
void FindOrderedHashTableEntryForSmiKey(Node* table, Node* key_tagged,
Variable* result, Label* entry_found,
Label* not_found);
void SameValueZeroSmi(Node* key_smi, Node* candidate_key, Label* if_same,
Label* if_not_same);
// Specialization for heap numbers.
// The {result} variable will contain the entry index if the key was found,
// or the hash code otherwise.
void SameValueZeroHeapNumber(Node* key_string, Node* candidate_key,
Label* if_same, Label* if_not_same);
template <typename CollectionType>
void FindOrderedHashTableEntryForHeapNumberKey(Node* context, Node* table,
Node* key_heap_number,
Variable* result,
Label* entry_found,
Label* not_found);
// Specialization for string.
// The {result} variable will contain the entry index if the key was found,
// or the hash code otherwise.
template <typename CollectionType>
void FindOrderedHashTableEntryForStringKey(Node* context, Node* table,
Node* key_tagged, Variable* result,
Label* entry_found,
Label* not_found);
Node* ComputeStringHash(Node* context, Node* string_key);
void SameValueZeroString(Node* context, Node* key_string, Node* candidate_key,
Label* if_same, Label* if_not_same);
// Specialization for non-strings, non-numbers. For those we only need
// reference equality to compare the keys.
// The {result} variable will contain the entry index if the key was found,
// or the hash code otherwise. If the hash-code has not been computed, it
// should be Smi -1.
template <typename CollectionType>
void FindOrderedHashTableEntryForOtherKey(Node* context, Node* table,
Node* key, Variable* result,
Label* entry_found,
Label* not_found);
template <typename CollectionType>
void TryLookupOrderedHashTableIndex(Node* const table, Node* const key,
Node* const context, Variable* result,
Label* if_entry_found,
Label* if_not_found);
Node* NormalizeNumberKey(Node* key);
void StoreOrderedHashMapNewEntry(Node* const table, Node* const key,
Node* const value, Node* const hash,
Node* const number_of_buckets,
Node* const occupancy);
void StoreOrderedHashSetNewEntry(Node* const table, Node* const key,
Node* const hash,
Node* const number_of_buckets,
Node* const occupancy);
};
template <typename CollectionType>
Node* CollectionsBuiltinsAssembler::AllocateOrderedHashTable() {
static const int kCapacity = CollectionType::kMinCapacity;
static const int kBucketCount = kCapacity / CollectionType::kLoadFactor;
static const int kDataTableLength = kCapacity * CollectionType::kEntrySize;
static const int kFixedArrayLength =
CollectionType::kHashTableStartIndex + kBucketCount + kDataTableLength;
static const int kDataTableStartIndex =
CollectionType::kHashTableStartIndex + kBucketCount;
STATIC_ASSERT(base::bits::IsPowerOfTwo(kCapacity));
STATIC_ASSERT(kCapacity <= CollectionType::kMaxCapacity);
// Allocate the table and add the proper map.
const ElementsKind elements_kind = HOLEY_ELEMENTS;
Node* const length_intptr = IntPtrConstant(kFixedArrayLength);
Node* const table = AllocateFixedArray(elements_kind, length_intptr);
CSA_ASSERT(this,
IntPtrLessThanOrEqual(
length_intptr, IntPtrConstant(FixedArray::kMaxRegularLength)));
Heap::RootListIndex map_index = Heap::kOrderedHashTableMapRootIndex;
// TODO(gsathya): Directly store correct in AllocateFixedArray,
// instead of overwriting here.
StoreMapNoWriteBarrier(table, map_index);
// Initialize the OrderedHashTable fields.
const WriteBarrierMode barrier_mode = SKIP_WRITE_BARRIER;
StoreFixedArrayElement(table, CollectionType::kNumberOfElementsIndex,
SmiConstant(0), barrier_mode);
StoreFixedArrayElement(table, CollectionType::kNumberOfDeletedElementsIndex,
SmiConstant(0), barrier_mode);
StoreFixedArrayElement(table, CollectionType::kNumberOfBucketsIndex,
SmiConstant(kBucketCount), barrier_mode);
// Fill the buckets with kNotFound.
Node* const not_found = SmiConstant(CollectionType::kNotFound);
STATIC_ASSERT(CollectionType::kHashTableStartIndex ==
CollectionType::kNumberOfBucketsIndex + 1);
STATIC_ASSERT((CollectionType::kHashTableStartIndex + kBucketCount) ==
kDataTableStartIndex);
for (int i = 0; i < kBucketCount; i++) {
StoreFixedArrayElement(table, CollectionType::kHashTableStartIndex + i,
not_found, barrier_mode);
}
// Fill the data table with undefined.
STATIC_ASSERT(kDataTableStartIndex + kDataTableLength == kFixedArrayLength);
for (int i = 0; i < kDataTableLength; i++) {
StoreFixedArrayElement(table, kDataTableStartIndex + i, UndefinedConstant(),
barrier_mode);
}
return table;
}
Node* CollectionsBuiltinsAssembler::AllocateJSCollection(
Node* js_map_function) {
CSA_ASSERT(this, IsConstructorMap(LoadMap(js_map_function)));
Node* const initial_map = LoadObjectField(
js_map_function, JSFunction::kPrototypeOrInitialMapOffset);
Node* const instance = AllocateJSObjectFromMap(initial_map);
StoreObjectFieldRoot(instance, JSMap::kTableOffset,
Heap::kUndefinedValueRootIndex);
return instance;
}
template <typename IteratorType>
Node* CollectionsBuiltinsAssembler::AllocateJSCollectionIterator(
Node* context, int map_index, Node* collection) {
Node* const table = LoadObjectField(collection, JSCollection::kTableOffset);
Node* const native_context = LoadNativeContext(context);
Node* const iterator_map = LoadContextElement(native_context, map_index);
Node* const iterator = AllocateInNewSpace(IteratorType::kSize);
StoreMapNoWriteBarrier(iterator, iterator_map);
StoreObjectFieldRoot(iterator, IteratorType::kPropertiesOrHashOffset,
Heap::kEmptyFixedArrayRootIndex);
StoreObjectFieldRoot(iterator, IteratorType::kElementsOffset,
Heap::kEmptyFixedArrayRootIndex);
StoreObjectFieldNoWriteBarrier(iterator, IteratorType::kTableOffset, table);
StoreObjectFieldNoWriteBarrier(iterator, IteratorType::kIndexOffset,
SmiConstant(0));
return iterator;
}
TF_BUILTIN(MapConstructor, CollectionsBuiltinsAssembler) {
const int kIterableArg = 0;
Node* argc =
ChangeInt32ToIntPtr(Parameter(BuiltinDescriptor::kArgumentsCount));
CodeStubArguments args(this, argc);
Node* const iterable = args.GetOptionalArgumentValue(kIterableArg);
Node* const new_target = Parameter(BuiltinDescriptor::kNewTarget);
Node* const context = Parameter(BuiltinDescriptor::kContext);
Label if_target_is_undefined(this, Label::kDeferred);
GotoIf(IsUndefined(new_target), &if_target_is_undefined);
Node* const native_context = LoadNativeContext(context);
Node* const js_map_fun =
LoadContextElement(native_context, Context::JS_MAP_FUN_INDEX);
VARIABLE(var_result, MachineRepresentation::kTagged);
Label init(this), exit(this), if_targetisnotmodified(this),
if_targetismodified(this);
Branch(WordEqual(js_map_fun, new_target), &if_targetisnotmodified,
&if_targetismodified);
BIND(&if_targetisnotmodified);
{
Node* const instance = AllocateJSCollection(js_map_fun);
var_result.Bind(instance);
Goto(&init);
}
BIND(&if_targetismodified);
{
ConstructorBuiltinsAssembler constructor_assembler(this->state());
Node* const instance = constructor_assembler.EmitFastNewObject(
context, js_map_fun, new_target);
var_result.Bind(instance);
Goto(&init);
}
BIND(&init);
Node* table = AllocateOrderedHashTable<OrderedHashMap>();
StoreObjectField(var_result.value(), JSMap::kTableOffset, table);
GotoIf(Word32Or(IsUndefined(iterable), IsNull(iterable)), &exit);
Label if_notcallable(this);
// TODO(gsathya): Add fast path for unmodified maps.
Node* const adder = GetProperty(context, var_result.value(),
isolate()->factory()->set_string());
GotoIf(TaggedIsSmi(adder), &if_notcallable);
GotoIfNot(IsCallable(adder), &if_notcallable);
IteratorBuiltinsAssembler iterator_assembler(this->state());
Node* const iterator = iterator_assembler.GetIterator(context, iterable);
GotoIf(IsUndefined(iterator), &exit);
Node* const fast_iterator_result_map =
LoadContextElement(native_context, Context::ITERATOR_RESULT_MAP_INDEX);
VARIABLE(var_exception, MachineRepresentation::kTagged, TheHoleConstant());
Label loop(this), if_notobject(this), if_exception(this);
Goto(&loop);
BIND(&loop);
{
Node* const next = iterator_assembler.IteratorStep(
context, iterator, &exit, fast_iterator_result_map);
Node* const next_value = iterator_assembler.IteratorValue(
context, next, fast_iterator_result_map);
GotoIf(TaggedIsSmi(next_value), &if_notobject);
GotoIfNot(IsJSReceiver(next_value), &if_notobject);
Node* const k =
GetProperty(context, next_value, isolate()->factory()->zero_string());
GotoIfException(k, &if_exception, &var_exception);
Node* const v =
GetProperty(context, next_value, isolate()->factory()->one_string());
GotoIfException(v, &if_exception, &var_exception);
Node* add_call = CallJS(CodeFactory::Call(isolate()), context, adder,
var_result.value(), k, v);
GotoIfException(add_call, &if_exception, &var_exception);
Goto(&loop);
BIND(&if_notobject);
{
Node* ret = CallRuntime(
Runtime::kThrowTypeError, context,
SmiConstant(MessageTemplate::kIteratorValueNotAnObject), next_value);
GotoIfException(ret, &if_exception, &var_exception);
Unreachable();
}
}
BIND(&if_exception);
{
iterator_assembler.IteratorCloseOnException(context, iterator,
&var_exception);
}
BIND(&if_notcallable);
{
Node* const receiver_str = HeapConstant(isolate()->factory()->add_string());
ThrowTypeError(context, MessageTemplate::kPropertyNotFunction, adder,
receiver_str, var_result.value());
}
BIND(&if_target_is_undefined);
ThrowTypeError(context, MessageTemplate::kConstructorNotFunction,
HeapConstant(isolate()->factory()->Map_string()));
BIND(&exit);
args.PopAndReturn(var_result.value());
}
TF_BUILTIN(SetConstructor, CollectionsBuiltinsAssembler) {
const int kIterableArg = 0;
Node* argc =
ChangeInt32ToIntPtr(Parameter(BuiltinDescriptor::kArgumentsCount));
CodeStubArguments args(this, argc);
Node* const iterable = args.GetOptionalArgumentValue(kIterableArg);
Node* const new_target = Parameter(BuiltinDescriptor::kNewTarget);
Node* const context = Parameter(BuiltinDescriptor::kContext);
Label if_target_is_undefined(this, Label::kDeferred);
GotoIf(IsUndefined(new_target), &if_target_is_undefined);
Node* const native_context = LoadNativeContext(context);
Node* const js_set_fun =
LoadContextElement(native_context, Context::JS_SET_FUN_INDEX);
VARIABLE(var_result, MachineRepresentation::kTagged);
Label init(this), exit(this), if_targetisnotmodified(this),
if_targetismodified(this);
Branch(WordEqual(js_set_fun, new_target), &if_targetisnotmodified,
&if_targetismodified);
BIND(&if_targetisnotmodified);
{
Node* const instance = AllocateJSCollection(js_set_fun);
var_result.Bind(instance);
Goto(&init);
}
BIND(&if_targetismodified);
{
ConstructorBuiltinsAssembler constructor_assembler(this->state());
Node* const instance = constructor_assembler.EmitFastNewObject(
context, js_set_fun, new_target);
var_result.Bind(instance);
Goto(&init);
}
BIND(&init);
Node* table = AllocateOrderedHashTable<OrderedHashSet>();
StoreObjectField(var_result.value(), JSSet::kTableOffset, table);
GotoIf(Word32Or(IsUndefined(iterable), IsNull(iterable)), &exit);
Label if_notcallable(this);
// TODO(gsathya): Add fast path for unmodified maps.
Node* const adder = GetProperty(context, var_result.value(),
isolate()->factory()->add_string());
GotoIf(TaggedIsSmi(adder), &if_notcallable);
GotoIfNot(IsCallable(adder), &if_notcallable);
IteratorBuiltinsAssembler iterator_assembler(this->state());
Node* const iterator = iterator_assembler.GetIterator(context, iterable);
GotoIf(IsUndefined(iterator), &exit);
Node* const fast_iterator_result_map =
LoadContextElement(native_context, Context::ITERATOR_RESULT_MAP_INDEX);
VARIABLE(var_exception, MachineRepresentation::kTagged, TheHoleConstant());
Label loop(this), if_notobject(this), if_exception(this);
Goto(&loop);
BIND(&loop);
{
Node* const next = iterator_assembler.IteratorStep(
context, iterator, &exit, fast_iterator_result_map);
Node* const next_value = iterator_assembler.IteratorValue(
context, next, fast_iterator_result_map);
Node* add_call = CallJS(CodeFactory::Call(isolate()), context, adder,
var_result.value(), next_value);
GotoIfException(add_call, &if_exception, &var_exception);
Goto(&loop);
}
BIND(&if_exception);
{
iterator_assembler.IteratorCloseOnException(context, iterator,
&var_exception);
}
BIND(&if_notcallable);
ThrowTypeError(context, MessageTemplate::kPropertyNotFunction, adder,
HeapConstant(isolate()->factory()->add_string()),
var_result.value());
BIND(&if_target_is_undefined);
ThrowTypeError(context, MessageTemplate::kConstructorNotFunction,
HeapConstant(isolate()->factory()->Set_string()));
BIND(&exit);
args.PopAndReturn(var_result.value());
}
Node* CollectionsBuiltinsAssembler::CallGetOrCreateHashRaw(Node* const key) {
Node* const function_addr =
ExternalConstant(ExternalReference::get_or_create_hash_raw(isolate()));
Node* const isolate_ptr =
ExternalConstant(ExternalReference::isolate_address(isolate()));
MachineType type_ptr = MachineType::Pointer();
MachineType type_tagged = MachineType::AnyTagged();
Node* const result = CallCFunction2(type_tagged, type_ptr, type_tagged,
function_addr, isolate_ptr, key);
return result;
}
Node* CollectionsBuiltinsAssembler::CallGetHashRaw(Node* const key) {
Node* const function_addr = ExternalConstant(
ExternalReference::orderedhashmap_gethash_raw(isolate()));
Node* const isolate_ptr =
ExternalConstant(ExternalReference::isolate_address(isolate()));
MachineType type_ptr = MachineType::Pointer();
MachineType type_tagged = MachineType::AnyTagged();
Node* const result = CallCFunction2(type_tagged, type_ptr, type_tagged,
function_addr, isolate_ptr, key);
return SmiUntag(result);
}
Node* CollectionsBuiltinsAssembler::GetHash(Node* const key) {
VARIABLE(var_result, MachineType::PointerRepresentation());
Label if_jsobject(this), other(this), done(this);
Node* instance_type = LoadMapInstanceType(LoadMap(key));
Branch(IsJSObjectInstanceType(instance_type), &if_jsobject, &other);
BIND(&if_jsobject);
{
Node* hash = LoadHashForJSObject(key, instance_type);
// TODO(gsathya): Change all uses of -1 to PropertyArray::kNoHashSentinel.
var_result.Bind(SelectConstant(
Word32Equal(hash, Int32Constant(PropertyArray::kNoHashSentinel)),
IntPtrConstant(-1), ChangeInt32ToIntPtr(hash),
MachineType::PointerRepresentation()));
Goto(&done);
}
BIND(&other);
{
var_result.Bind(CallGetHashRaw(key));
Goto(&done);
}
BIND(&done);
return var_result.value();
}
void CollectionsBuiltinsAssembler::SameValueZeroSmi(Node* key_smi,
Node* candidate_key,
Label* if_same,
Label* if_not_same) {
// If the key is the same, we are done.
GotoIf(WordEqual(candidate_key, key_smi), if_same);
// If the candidate key is smi, then it must be different (because
// we already checked for equality above).
GotoIf(TaggedIsSmi(candidate_key), if_not_same);
// If the candidate key is not smi, we still have to check if it is a
// heap number with the same value.
GotoIfNot(IsHeapNumber(candidate_key), if_not_same);
Node* const candidate_key_number = LoadHeapNumberValue(candidate_key);
Node* const key_number = SmiToFloat64(key_smi);
GotoIf(Float64Equal(candidate_key_number, key_number), if_same);
Goto(if_not_same);
}
template <typename CollectionType>
void CollectionsBuiltinsAssembler::FindOrderedHashTableEntryForSmiKey(
Node* table, Node* smi_key, Variable* result, Label* entry_found,
Label* not_found) {
Node* const key_untagged = SmiUntag(smi_key);
Node* const hash = ChangeInt32ToIntPtr(ComputeUnseededHash(key_untagged));
CSA_ASSERT(this, IntPtrGreaterThanOrEqual(hash, IntPtrConstant(0)));
result->Bind(hash);
FindOrderedHashTableEntry<CollectionType>(
table, hash,
[&](Node* other_key, Label* if_same, Label* if_not_same) {
SameValueZeroSmi(smi_key, other_key, if_same, if_not_same);
},
result, entry_found, not_found);
}
template <typename CollectionType>
void CollectionsBuiltinsAssembler::FindOrderedHashTableEntryForStringKey(
Node* context, Node* table, Node* key_tagged, Variable* result,
Label* entry_found, Label* not_found) {
Node* const hash = ComputeStringHash(context, key_tagged);
CSA_ASSERT(this, IntPtrGreaterThanOrEqual(hash, IntPtrConstant(0)));
result->Bind(hash);
FindOrderedHashTableEntry<CollectionType>(
table, hash,
[&](Node* other_key, Label* if_same, Label* if_not_same) {
SameValueZeroString(context, key_tagged, other_key, if_same,
if_not_same);
},
result, entry_found, not_found);
}
template <typename CollectionType>
void CollectionsBuiltinsAssembler::FindOrderedHashTableEntryForHeapNumberKey(
Node* context, Node* table, Node* key_heap_number, Variable* result,
Label* entry_found, Label* not_found) {
Node* hash = CallGetHashRaw(key_heap_number);
CSA_ASSERT(this, IntPtrGreaterThanOrEqual(hash, IntPtrConstant(0)));
result->Bind(hash);
Node* const key_float = LoadHeapNumberValue(key_heap_number);
FindOrderedHashTableEntry<CollectionType>(
table, hash,
[&](Node* other_key, Label* if_same, Label* if_not_same) {
SameValueZeroHeapNumber(key_float, other_key, if_same, if_not_same);
},
result, entry_found, not_found);
}
template <typename CollectionType>
void CollectionsBuiltinsAssembler::FindOrderedHashTableEntryForOtherKey(
Node* context, Node* table, Node* key, Variable* result, Label* entry_found,
Label* not_found) {
Node* hash = GetHash(key);
result->Bind(hash);
FindOrderedHashTableEntry<CollectionType>(
table, hash,
[&](Node* other_key, Label* if_same, Label* if_not_same) {
Branch(WordEqual(key, other_key), if_same, if_not_same);
},
result, entry_found, not_found);
}
Node* CollectionsBuiltinsAssembler::ComputeStringHash(Node* context,
Node* string_key) {
VARIABLE(var_result, MachineType::PointerRepresentation());
Label hash_not_computed(this), done(this, &var_result);
Node* hash =
ChangeInt32ToIntPtr(LoadNameHash(string_key, &hash_not_computed));
var_result.Bind(hash);
Goto(&done);
BIND(&hash_not_computed);
var_result.Bind(CallGetHashRaw(string_key));
Goto(&done);
BIND(&done);
return var_result.value();
}
void CollectionsBuiltinsAssembler::SameValueZeroString(Node* context,
Node* key_string,
Node* candidate_key,
Label* if_same,
Label* if_not_same) {
// If the candidate is not a string, the keys are not equal.
GotoIf(TaggedIsSmi(candidate_key), if_not_same);
GotoIfNot(IsString(candidate_key), if_not_same);
Branch(WordEqual(CallBuiltin(Builtins::kStringEqual, context, key_string,
candidate_key),
TrueConstant()),
if_same, if_not_same);
}
void CollectionsBuiltinsAssembler::SameValueZeroHeapNumber(Node* key_float,
Node* candidate_key,
Label* if_same,
Label* if_not_same) {
Label if_smi(this), if_keyisnan(this);
// If the candidate is not a string, the keys are not equal.
GotoIf(TaggedIsSmi(candidate_key), &if_smi);
GotoIfNot(IsHeapNumber(candidate_key), if_not_same);
{
// {candidate_key} is a heap number.
Node* const candidate_float = LoadHeapNumberValue(candidate_key);
GotoIf(Float64Equal(key_float, candidate_float), if_same);
// SameValueZero needs to treat NaNs as equal. First check if {key_float}
// is NaN.
BranchIfFloat64IsNaN(key_float, &if_keyisnan, if_not_same);
BIND(&if_keyisnan);
{
// Return true iff {candidate_key} is NaN.
Branch(Float64Equal(candidate_float, candidate_float), if_not_same,
if_same);
}
}
BIND(&if_smi);
{
Node* const candidate_float = SmiToFloat64(candidate_key);
Branch(Float64Equal(key_float, candidate_float), if_same, if_not_same);
}
}
template <typename CollectionType>
void CollectionsBuiltinsAssembler::FindOrderedHashTableEntry(
Node* table, Node* hash,
std::function<void(Node*, Label*, Label*)> key_compare,
Variable* entry_start_position, Label* entry_found, Label* not_found) {
// Get the index of the bucket.
Node* const number_of_buckets = SmiUntag(
LoadFixedArrayElement(table, CollectionType::kNumberOfBucketsIndex));
Node* const bucket =
WordAnd(hash, IntPtrSub(number_of_buckets, IntPtrConstant(1)));
Node* const first_entry = SmiUntag(LoadFixedArrayElement(
table, bucket, CollectionType::kHashTableStartIndex * kPointerSize));
// Walk the bucket chain.
Node* entry_start;
Label if_key_found(this);
{
VARIABLE(var_entry, MachineType::PointerRepresentation(), first_entry);
Label loop(this, {&var_entry, entry_start_position}),
continue_next_entry(this);
Goto(&loop);
BIND(&loop);
// If the entry index is the not-found sentinel, we are done.
GotoIf(
WordEqual(var_entry.value(), IntPtrConstant(CollectionType::kNotFound)),
not_found);
// Make sure the entry index is within range.
CSA_ASSERT(
this,
UintPtrLessThan(
var_entry.value(),
SmiUntag(SmiAdd(
LoadFixedArrayElement(table,
CollectionType::kNumberOfElementsIndex),
LoadFixedArrayElement(
table, CollectionType::kNumberOfDeletedElementsIndex)))));
// Compute the index of the entry relative to kHashTableStartIndex.
entry_start =
IntPtrAdd(IntPtrMul(var_entry.value(),
IntPtrConstant(CollectionType::kEntrySize)),
number_of_buckets);
// Load the key from the entry.
Node* const candidate_key = LoadFixedArrayElement(
table, entry_start,
CollectionType::kHashTableStartIndex * kPointerSize);
key_compare(candidate_key, &if_key_found, &continue_next_entry);
BIND(&continue_next_entry);
// Load the index of the next entry in the bucket chain.
var_entry.Bind(SmiUntag(LoadFixedArrayElement(
table, entry_start,
(CollectionType::kHashTableStartIndex + CollectionType::kChainOffset) *
kPointerSize)));
Goto(&loop);
}
BIND(&if_key_found);
entry_start_position->Bind(entry_start);
Goto(entry_found);
}
TF_BUILTIN(OrderedHashTableHealIndex, CollectionsBuiltinsAssembler) {
Node* table = Parameter(Descriptor::kTable);
Node* index = Parameter(Descriptor::kIndex);
CSA_ASSERT(this, TaggedIsNotSmi(table));
CSA_ASSERT(this, TaggedIsSmi(index));
Label return_index(this), return_zero(this);
// Check if we need to update the {index}.
GotoIfNot(SmiLessThan(SmiConstant(Smi::kZero), index), &return_zero);
// Check if the {table} was cleared.
Node* number_of_deleted_elements = LoadAndUntagObjectField(
table, OrderedHashTableBase::kNumberOfDeletedElementsOffset);
GotoIf(WordEqual(number_of_deleted_elements,
IntPtrConstant(OrderedHashTableBase::kClearedTableSentinel)),
&return_zero);
VARIABLE(var_i, MachineType::PointerRepresentation(), IntPtrConstant(0));
VARIABLE(var_index, MachineRepresentation::kTagged, index);
Label loop(this, {&var_i, &var_index});
Goto(&loop);
BIND(&loop);
{
Node* i = var_i.value();
GotoIfNot(IntPtrLessThan(i, number_of_deleted_elements), &return_index);
Node* removed_index = LoadFixedArrayElement(
table, i, OrderedHashTableBase::kRemovedHolesIndex * kPointerSize);
GotoIf(SmiGreaterThanOrEqual(removed_index, index), &return_index);
Decrement(&var_index, 1, SMI_PARAMETERS);
Increment(&var_i);
Goto(&loop);
}
BIND(&return_index);
Return(var_index.value());
BIND(&return_zero);
Return(SmiConstant(Smi::kZero));
}
template <typename TableType>
std::tuple<Node*, Node*> CollectionsBuiltinsAssembler::Transition(
Node* const table, Node* const index,
UpdateInTransition const& update_in_transition) {
VARIABLE(var_index, MachineType::PointerRepresentation(), index);
VARIABLE(var_table, MachineRepresentation::kTagged, table);
Label if_done(this), if_transition(this, Label::kDeferred);
Branch(TaggedIsSmi(
LoadObjectField(var_table.value(), TableType::kNextTableOffset)),
&if_done, &if_transition);
BIND(&if_transition);
{
Label loop(this, {&var_table, &var_index}), done_loop(this);
Goto(&loop);
BIND(&loop);
{
Node* table = var_table.value();
Node* index = var_index.value();
Node* next_table = LoadObjectField(table, TableType::kNextTableOffset);
GotoIf(TaggedIsSmi(next_table), &done_loop);
var_table.Bind(next_table);
var_index.Bind(
SmiUntag(CallBuiltin(Builtins::kOrderedHashTableHealIndex,
NoContextConstant(), table, SmiTag(index))));
Goto(&loop);
}
BIND(&done_loop);
// Update with the new {table} and {index}.
update_in_transition(var_table.value(), var_index.value());
Goto(&if_done);
}
BIND(&if_done);
return std::tuple<Node*, Node*>(var_table.value(), var_index.value());
}
template <typename IteratorType, typename TableType>
std::tuple<Node*, Node*> CollectionsBuiltinsAssembler::TransitionAndUpdate(
Node* const iterator) {
return Transition<TableType>(
LoadObjectField(iterator, IteratorType::kTableOffset),
LoadAndUntagObjectField(iterator, IteratorType::kIndexOffset),
[this, iterator](Node* const table, Node* const index) {
// Update the {iterator} with the new state.
StoreObjectField(iterator, IteratorType::kTableOffset, table);
StoreObjectFieldNoWriteBarrier(iterator, IteratorType::kIndexOffset,
SmiTag(index));
});
}
template <typename TableType>
std::tuple<Node*, Node*, Node*> CollectionsBuiltinsAssembler::NextSkipHoles(
Node* table, Node* index, Label* if_end) {
// Compute the used capacity for the {table}.
Node* number_of_buckets =
LoadAndUntagObjectField(table, TableType::kNumberOfBucketsOffset);
Node* number_of_elements =
LoadAndUntagObjectField(table, TableType::kNumberOfElementsOffset);
Node* number_of_deleted_elements =
LoadAndUntagObjectField(table, TableType::kNumberOfDeletedElementsOffset);
Node* used_capacity =
IntPtrAdd(number_of_elements, number_of_deleted_elements);
Node* entry_key;
Node* entry_start_position;
VARIABLE(var_index, MachineType::PointerRepresentation(), index);
Label loop(this, &var_index), done_loop(this);
Goto(&loop);
BIND(&loop);
{
GotoIfNot(IntPtrLessThan(var_index.value(), used_capacity), if_end);
entry_start_position = IntPtrAdd(
IntPtrMul(var_index.value(), IntPtrConstant(TableType::kEntrySize)),
number_of_buckets);
entry_key =
LoadFixedArrayElement(table, entry_start_position,
TableType::kHashTableStartIndex * kPointerSize);
Increment(&var_index);
Branch(IsTheHole(entry_key), &loop, &done_loop);
}
BIND(&done_loop);
return std::tuple<Node*, Node*, Node*>(entry_key, entry_start_position,
var_index.value());
}
TF_BUILTIN(MapGet, CollectionsBuiltinsAssembler) {
Node* const receiver = Parameter(Descriptor::kReceiver);
Node* const key = Parameter(Descriptor::kKey);
Node* const context = Parameter(Descriptor::kContext);
ThrowIfNotInstanceType(context, receiver, JS_MAP_TYPE, "Map.prototype.get");
Node* const table = LoadObjectField(receiver, JSMap::kTableOffset);
Node* index = CallBuiltin(Builtins::kMapLookupHashIndex, context, table, key);
Label if_found(this), if_not_found(this);
Branch(SmiGreaterThanOrEqual(index, SmiConstant(0)), &if_found,
&if_not_found);
BIND(&if_found);
Return(LoadFixedArrayElement(table, SmiUntag(index)));
BIND(&if_not_found);
Return(UndefinedConstant());
}
TF_BUILTIN(MapHas, CollectionsBuiltinsAssembler) {
Node* const receiver = Parameter(Descriptor::kReceiver);
Node* const key = Parameter(Descriptor::kKey);
Node* const context = Parameter(Descriptor::kContext);
ThrowIfNotInstanceType(context, receiver, JS_MAP_TYPE, "Map.prototype.has");
Node* const table = LoadObjectField(receiver, JSMap::kTableOffset);
Node* index = CallBuiltin(Builtins::kMapLookupHashIndex, context, table, key);
Label if_found(this), if_not_found(this);
Branch(SmiGreaterThanOrEqual(index, SmiConstant(0)), &if_found,
&if_not_found);
BIND(&if_found);
Return(TrueConstant());
BIND(&if_not_found);
Return(FalseConstant());
}
Node* CollectionsBuiltinsAssembler::NormalizeNumberKey(Node* const key) {
VARIABLE(result, MachineRepresentation::kTagged, key);
Label done(this);
GotoIf(TaggedIsSmi(key), &done);
GotoIfNot(IsHeapNumber(key), &done);
Node* const number = LoadHeapNumberValue(key);
GotoIfNot(Float64Equal(number, Float64Constant(0.0)), &done);
// We know the value is zero, so we take the key to be Smi 0.
// Another option would be to normalize to Smi here.
result.Bind(SmiConstant(0));
Goto(&done);
BIND(&done);
return result.value();
}
TF_BUILTIN(MapSet, CollectionsBuiltinsAssembler) {
Node* const receiver = Parameter(Descriptor::kReceiver);
Node* key = Parameter(Descriptor::kKey);
Node* const value = Parameter(Descriptor::kValue);
Node* const context = Parameter(Descriptor::kContext);
ThrowIfNotInstanceType(context, receiver, JS_MAP_TYPE, "Map.prototype.set");
key = NormalizeNumberKey(key);
Node* const table = LoadObjectField(receiver, JSMap::kTableOffset);
VARIABLE(entry_start_position_or_hash, MachineType::PointerRepresentation(),
IntPtrConstant(0));
Label entry_found(this), not_found(this);
TryLookupOrderedHashTableIndex<OrderedHashMap>(table, key, context,
&entry_start_position_or_hash,
&entry_found, ¬_found);
BIND(&entry_found);
// If we found the entry, we just store the value there.
StoreFixedArrayElement(table, entry_start_position_or_hash.value(), value,
UPDATE_WRITE_BARRIER,
kPointerSize * (OrderedHashMap::kHashTableStartIndex +
OrderedHashMap::kValueOffset));
Return(receiver);
Label no_hash(this), add_entry(this), store_new_entry(this);
BIND(¬_found);
{
// If we have a hash code, we can start adding the new entry.
GotoIf(IntPtrGreaterThanOrEqual(entry_start_position_or_hash.value(),
IntPtrConstant(0)),
&add_entry);
// Otherwise, go to runtime to compute the hash code.
entry_start_position_or_hash.Bind(SmiUntag(CallGetOrCreateHashRaw(key)));
Goto(&add_entry);
}
BIND(&add_entry);
VARIABLE(number_of_buckets, MachineType::PointerRepresentation());
VARIABLE(occupancy, MachineType::PointerRepresentation());
VARIABLE(table_var, MachineRepresentation::kTaggedPointer, table);
{
// Check we have enough space for the entry.
number_of_buckets.Bind(SmiUntag(
LoadFixedArrayElement(table, OrderedHashMap::kNumberOfBucketsIndex)));
STATIC_ASSERT(OrderedHashMap::kLoadFactor == 2);
Node* const capacity = WordShl(number_of_buckets.value(), 1);
Node* const number_of_elements = SmiUntag(
CAST(LoadObjectField(table, OrderedHashMap::kNumberOfElementsOffset)));
Node* const number_of_deleted = SmiUntag(CAST(LoadObjectField(
table, OrderedHashMap::kNumberOfDeletedElementsOffset)));
occupancy.Bind(IntPtrAdd(number_of_elements, number_of_deleted));
GotoIf(IntPtrLessThan(occupancy.value(), capacity), &store_new_entry);
// We do not have enough space, grow the table and reload the relevant
// fields.
CallRuntime(Runtime::kMapGrow, context, receiver);
table_var.Bind(LoadObjectField(receiver, JSMap::kTableOffset));
number_of_buckets.Bind(SmiUntag(LoadFixedArrayElement(
table_var.value(), OrderedHashMap::kNumberOfBucketsIndex)));
Node* const new_number_of_elements = SmiUntag(CAST(LoadObjectField(
table_var.value(), OrderedHashMap::kNumberOfElementsOffset)));
Node* const new_number_of_deleted = SmiUntag(CAST(LoadObjectField(
table_var.value(), OrderedHashMap::kNumberOfDeletedElementsOffset)));
occupancy.Bind(IntPtrAdd(new_number_of_elements, new_number_of_deleted));
Goto(&store_new_entry);
}
BIND(&store_new_entry);
// Store the key, value and connect the element to the bucket chain.
StoreOrderedHashMapNewEntry(table_var.value(), key, value,
entry_start_position_or_hash.value(),
number_of_buckets.value(), occupancy.value());
Return(receiver);
}
void CollectionsBuiltinsAssembler::StoreOrderedHashMapNewEntry(
Node* const table, Node* const key, Node* const value, Node* const hash,
Node* const number_of_buckets, Node* const occupancy) {
Node* const bucket =
WordAnd(hash, IntPtrSub(number_of_buckets, IntPtrConstant(1)));
Node* const bucket_entry = LoadFixedArrayElement(
table, bucket, OrderedHashMap::kHashTableStartIndex * kPointerSize);
// Store the entry elements.
Node* const entry_start = IntPtrAdd(
IntPtrMul(occupancy, IntPtrConstant(OrderedHashMap::kEntrySize)),
number_of_buckets);
StoreFixedArrayElement(table, entry_start, key, UPDATE_WRITE_BARRIER,
kPointerSize * OrderedHashMap::kHashTableStartIndex);
StoreFixedArrayElement(table, entry_start, value, UPDATE_WRITE_BARRIER,
kPointerSize * (OrderedHashMap::kHashTableStartIndex +
OrderedHashMap::kValueOffset));
StoreFixedArrayElement(table, entry_start, bucket_entry, SKIP_WRITE_BARRIER,
kPointerSize * (OrderedHashMap::kHashTableStartIndex +
OrderedHashMap::kChainOffset));
// Update the bucket head.
StoreFixedArrayElement(table, bucket, SmiTag(occupancy), SKIP_WRITE_BARRIER,