/
builtins-collections-gen.cc
2455 lines (2085 loc) · 96.9 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/heap/factory-inl.h"
#include "src/objects/hash-table-inl.h"
namespace v8 {
namespace internal {
using compiler::Node;
template <class T>
using TNode = compiler::TNode<T>;
template <class T>
using TVariable = compiler::TypedCodeAssemblerVariable<T>;
class BaseCollectionsAssembler : public CodeStubAssembler {
public:
explicit BaseCollectionsAssembler(compiler::CodeAssemblerState* state)
: CodeStubAssembler(state) {}
virtual ~BaseCollectionsAssembler() {}
protected:
enum Variant { kMap, kSet, kWeakMap, kWeakSet };
// Adds an entry to a collection. For Maps, properly handles extracting the
// key and value from the entry (see LoadKeyValue()).
void AddConstructorEntry(Variant variant, TNode<Context> context,
TNode<Object> collection, TNode<Object> add_function,
TNode<Object> key_value,
Label* if_may_have_side_effects = nullptr,
Label* if_exception = nullptr,
TVariable<Object>* var_exception = nullptr);
// Adds constructor entries to a collection. Choosing a fast path when
// possible.
void AddConstructorEntries(Variant variant, TNode<Context> context,
TNode<Context> native_context,
TNode<Object> collection,
TNode<Object> initial_entries);
// Fast path for adding constructor entries. Assumes the entries are a fast
// JS array (see CodeStubAssembler::BranchIfFastJSArray()).
void AddConstructorEntriesFromFastJSArray(Variant variant,
TNode<Context> context,
TNode<Context> native_context,
TNode<Object> collection,
TNode<JSArray> fast_jsarray,
Label* if_may_have_side_effects);
// Adds constructor entries to a collection using the iterator protocol.
void AddConstructorEntriesFromIterable(Variant variant,
TNode<Context> context,
TNode<Context> native_context,
TNode<Object> collection,
TNode<Object> iterable);
// Constructs a collection instance. Choosing a fast path when possible.
TNode<Object> AllocateJSCollection(TNode<Context> context,
TNode<JSFunction> constructor,
TNode<Object> new_target);
// Fast path for constructing a collection instance if the constructor
// function has not been modified.
TNode<Object> AllocateJSCollectionFast(TNode<HeapObject> constructor);
// Fallback for constructing a collection instance if the constructor function
// has been modified.
TNode<Object> AllocateJSCollectionSlow(TNode<Context> context,
TNode<JSFunction> constructor,
TNode<Object> new_target);
// Allocates the backing store for a collection.
virtual TNode<Object> AllocateTable(Variant variant, TNode<Context> context,
TNode<IntPtrT> at_least_space_for) = 0;
// Main entry point for a collection constructor builtin.
void GenerateConstructor(Variant variant,
Handle<String> constructor_function_name);
// Retrieves the collection function that adds an entry. `set` for Maps and
// `add` for Sets.
TNode<Object> GetAddFunction(Variant variant, TNode<Context> context,
TNode<Object> collection);
// Retrieves the collection constructor function.
TNode<JSFunction> GetConstructor(Variant variant,
TNode<Context> native_context);
// Retrieves the initial collection function that adds an entry. Should only
// be called when it is certain that a collection prototype's map hasn't been
// changed.
TNode<JSFunction> GetInitialAddFunction(Variant variant,
TNode<Context> native_context);
// Retrieves the offset to access the backing table from the collection.
int GetTableOffset(Variant variant);
// Estimates the number of entries the collection will have after adding the
// entries passed in the constructor. AllocateTable() can use this to avoid
// the time of growing/rehashing when adding the constructor entries.
TNode<IntPtrT> EstimatedInitialSize(TNode<Object> initial_entries,
TNode<BoolT> is_fast_jsarray);
void GotoIfNotJSReceiver(Node* const obj, Label* if_not_receiver);
// Determines whether the collection's prototype has been modified.
TNode<BoolT> HasInitialCollectionPrototype(Variant variant,
TNode<Context> native_context,
TNode<Object> collection);
// Loads an element from a fixed array. If the element is the hole, returns
// `undefined`.
TNode<Object> LoadAndNormalizeFixedArrayElement(TNode<HeapObject> elements,
TNode<IntPtrT> index);
// Loads an element from a fixed double array. If the element is the hole,
// returns `undefined`.
TNode<Object> LoadAndNormalizeFixedDoubleArrayElement(
TNode<HeapObject> elements, TNode<IntPtrT> index);
// Loads key and value variables with the first and second elements of an
// array. If the array lacks 2 elements, undefined is used.
void LoadKeyValue(TNode<Context> context, TNode<Object> maybe_array,
TVariable<Object>* key, TVariable<Object>* value,
Label* if_may_have_side_effects = nullptr,
Label* if_exception = nullptr,
TVariable<Object>* var_exception = nullptr);
};
void BaseCollectionsAssembler::AddConstructorEntry(
Variant variant, TNode<Context> context, TNode<Object> collection,
TNode<Object> add_function, TNode<Object> key_value,
Label* if_may_have_side_effects, Label* if_exception,
TVariable<Object>* var_exception) {
CSA_ASSERT(this, Word32BinaryNot(IsTheHole(key_value)));
if (variant == kMap || variant == kWeakMap) {
TVARIABLE(Object, key);
TVARIABLE(Object, value);
LoadKeyValue(context, key_value, &key, &value, if_may_have_side_effects,
if_exception, var_exception);
Node* key_n = key.value();
Node* value_n = value.value();
Node* ret = CallJS(CodeFactory::Call(isolate()), context, add_function,
collection, key_n, value_n);
GotoIfException(ret, if_exception, var_exception);
} else {
DCHECK(variant == kSet || variant == kWeakSet);
Node* ret = CallJS(CodeFactory::Call(isolate()), context, add_function,
collection, key_value);
GotoIfException(ret, if_exception, var_exception);
}
}
void BaseCollectionsAssembler::AddConstructorEntries(
Variant variant, TNode<Context> context, TNode<Context> native_context,
TNode<Object> collection, TNode<Object> initial_entries) {
TVARIABLE(BoolT, use_fast_loop,
IsFastJSArrayWithNoCustomIteration(initial_entries, context,
native_context));
TNode<IntPtrT> at_least_space_for =
EstimatedInitialSize(initial_entries, use_fast_loop.value());
Label allocate_table(this, &use_fast_loop), exit(this), fast_loop(this),
slow_loop(this, Label::kDeferred);
Goto(&allocate_table);
BIND(&allocate_table);
{
TNode<Object> table = AllocateTable(variant, context, at_least_space_for);
StoreObjectField(collection, GetTableOffset(variant), table);
GotoIf(IsNullOrUndefined(initial_entries), &exit);
GotoIfNot(
HasInitialCollectionPrototype(variant, native_context, collection),
&slow_loop);
Branch(use_fast_loop.value(), &fast_loop, &slow_loop);
}
BIND(&fast_loop);
{
TNode<JSArray> initial_entries_jsarray =
UncheckedCast<JSArray>(initial_entries);
#if DEBUG
CSA_ASSERT(this, IsFastJSArrayWithNoCustomIteration(
initial_entries_jsarray, context, native_context));
TNode<Map> original_initial_entries_map = LoadMap(initial_entries_jsarray);
#endif
Label if_may_have_side_effects(this, Label::kDeferred);
AddConstructorEntriesFromFastJSArray(variant, context, native_context,
collection, initial_entries_jsarray,
&if_may_have_side_effects);
Goto(&exit);
if (variant == kMap || variant == kWeakMap) {
BIND(&if_may_have_side_effects);
#if DEBUG
CSA_ASSERT(this, HasInitialCollectionPrototype(variant, native_context,
collection));
CSA_ASSERT(this, WordEqual(original_initial_entries_map,
LoadMap(initial_entries_jsarray)));
#endif
use_fast_loop = Int32FalseConstant();
Goto(&allocate_table);
}
}
BIND(&slow_loop);
{
AddConstructorEntriesFromIterable(variant, context, native_context,
collection, initial_entries);
Goto(&exit);
}
BIND(&exit);
}
void BaseCollectionsAssembler::AddConstructorEntriesFromFastJSArray(
Variant variant, TNode<Context> context, TNode<Context> native_context,
TNode<Object> collection, TNode<JSArray> fast_jsarray,
Label* if_may_have_side_effects) {
TNode<FixedArrayBase> elements = LoadElements(fast_jsarray);
TNode<Int32T> elements_kind = LoadMapElementsKind(LoadMap(fast_jsarray));
TNode<JSFunction> add_func = GetInitialAddFunction(variant, native_context);
CSA_ASSERT(
this,
WordEqual(GetAddFunction(variant, native_context, collection), add_func));
CSA_ASSERT(this, IsFastJSArrayWithNoCustomIteration(fast_jsarray, context,
native_context));
TNode<IntPtrT> length = SmiUntag(LoadFastJSArrayLength(fast_jsarray));
CSA_ASSERT(this, IntPtrGreaterThanOrEqual(length, IntPtrConstant(0)));
CSA_ASSERT(
this, HasInitialCollectionPrototype(variant, native_context, collection));
#if DEBUG
TNode<Map> original_collection_map = LoadMap(CAST(collection));
TNode<Map> original_fast_js_array_map = LoadMap(fast_jsarray);
#endif
Label exit(this), if_doubles(this), if_smiorobjects(this);
GotoIf(IntPtrEqual(length, IntPtrConstant(0)), &exit);
Branch(IsFastSmiOrTaggedElementsKind(elements_kind), &if_smiorobjects,
&if_doubles);
BIND(&if_smiorobjects);
{
auto set_entry = [&](Node* index) {
TNode<Object> element = LoadAndNormalizeFixedArrayElement(
elements, UncheckedCast<IntPtrT>(index));
AddConstructorEntry(variant, context, collection, add_func, element,
if_may_have_side_effects);
};
// Instead of using the slower iteration protocol to iterate over the
// elements, a fast loop is used. This assumes that adding an element
// to the collection does not call user code that could mutate the elements
// or collection.
BuildFastLoop(IntPtrConstant(0), length, set_entry, 1,
ParameterMode::INTPTR_PARAMETERS, IndexAdvanceMode::kPost);
Goto(&exit);
}
BIND(&if_doubles);
{
// A Map constructor requires entries to be arrays (ex. [key, value]),
// so a FixedDoubleArray can never succeed.
if (variant == kMap || variant == kWeakMap) {
CSA_ASSERT(this, IntPtrGreaterThan(length, IntPtrConstant(0)));
TNode<Object> element =
LoadAndNormalizeFixedDoubleArrayElement(elements, IntPtrConstant(0));
ThrowTypeError(context, MessageTemplate::kIteratorValueNotAnObject,
element);
} else {
DCHECK(variant == kSet || variant == kWeakSet);
auto set_entry = [&](Node* index) {
TNode<Object> entry = LoadAndNormalizeFixedDoubleArrayElement(
elements, UncheckedCast<IntPtrT>(index));
AddConstructorEntry(variant, context, collection, add_func, entry);
};
BuildFastLoop(IntPtrConstant(0), length, set_entry, 1,
ParameterMode::INTPTR_PARAMETERS, IndexAdvanceMode::kPost);
Goto(&exit);
}
}
BIND(&exit);
#if DEBUG
CSA_ASSERT(this,
WordEqual(original_collection_map, LoadMap(CAST(collection))));
CSA_ASSERT(this,
WordEqual(original_fast_js_array_map, LoadMap(fast_jsarray)));
#endif
}
void BaseCollectionsAssembler::AddConstructorEntriesFromIterable(
Variant variant, TNode<Context> context, TNode<Context> native_context,
TNode<Object> collection, TNode<Object> iterable) {
Label exit(this), loop(this), if_exception(this, Label::kDeferred);
CSA_ASSERT(this, Word32BinaryNot(IsNullOrUndefined(iterable)));
TNode<Object> add_func = GetAddFunction(variant, context, collection);
IteratorBuiltinsAssembler iterator_assembler(this->state());
IteratorRecord iterator = iterator_assembler.GetIterator(context, iterable);
CSA_ASSERT(this, Word32BinaryNot(IsUndefined(iterator.object)));
TNode<Object> fast_iterator_result_map =
LoadContextElement(native_context, Context::ITERATOR_RESULT_MAP_INDEX);
TVARIABLE(Object, var_exception);
Goto(&loop);
BIND(&loop);
{
TNode<Object> next = CAST(iterator_assembler.IteratorStep(
context, iterator, &exit, fast_iterator_result_map));
TNode<Object> next_value = CAST(iterator_assembler.IteratorValue(
context, next, fast_iterator_result_map));
AddConstructorEntry(variant, context, collection, add_func, next_value,
nullptr, &if_exception, &var_exception);
Goto(&loop);
}
BIND(&if_exception);
{
iterator_assembler.IteratorCloseOnException(context, iterator,
&var_exception);
}
BIND(&exit);
}
TNode<Object> BaseCollectionsAssembler::AllocateJSCollection(
TNode<Context> context, TNode<JSFunction> constructor,
TNode<Object> new_target) {
TNode<BoolT> is_target_unmodified = WordEqual(constructor, new_target);
return Select<Object>(is_target_unmodified,
[=] { return AllocateJSCollectionFast(constructor); },
[=] {
return AllocateJSCollectionSlow(context, constructor,
new_target);
});
}
TNode<Object> BaseCollectionsAssembler::AllocateJSCollectionFast(
TNode<HeapObject> constructor) {
CSA_ASSERT(this, IsConstructorMap(LoadMap(constructor)));
TNode<Object> initial_map =
LoadObjectField(constructor, JSFunction::kPrototypeOrInitialMapOffset);
return CAST(AllocateJSObjectFromMap(initial_map));
}
TNode<Object> BaseCollectionsAssembler::AllocateJSCollectionSlow(
TNode<Context> context, TNode<JSFunction> constructor,
TNode<Object> new_target) {
ConstructorBuiltinsAssembler constructor_assembler(this->state());
return CAST(constructor_assembler.EmitFastNewObject(context, constructor,
new_target));
}
void BaseCollectionsAssembler::GenerateConstructor(
Variant variant, Handle<String> constructor_function_name) {
const int kIterableArg = 0;
CodeStubArguments args(
this, ChangeInt32ToIntPtr(Parameter(BuiltinDescriptor::kArgumentsCount)));
TNode<Object> iterable = args.GetOptionalArgumentValue(kIterableArg);
TNode<Object> new_target = CAST(Parameter(BuiltinDescriptor::kNewTarget));
TNode<Context> context = CAST(Parameter(BuiltinDescriptor::kContext));
Label if_undefined(this, Label::kDeferred);
GotoIf(IsUndefined(new_target), &if_undefined);
TNode<Context> native_context = LoadNativeContext(context);
TNode<Object> collection = AllocateJSCollection(
context, GetConstructor(variant, native_context), new_target);
AddConstructorEntries(variant, context, native_context, collection, iterable);
Return(collection);
BIND(&if_undefined);
ThrowTypeError(context, MessageTemplate::kConstructorNotFunction,
HeapConstant(constructor_function_name));
}
TNode<Object> BaseCollectionsAssembler::GetAddFunction(
Variant variant, TNode<Context> context, TNode<Object> collection) {
Handle<String> add_func_name = (variant == kMap || variant == kWeakMap)
? isolate()->factory()->set_string()
: isolate()->factory()->add_string();
TNode<Object> add_func = GetProperty(context, collection, add_func_name);
Label exit(this), if_notcallable(this, Label::kDeferred);
GotoIf(TaggedIsSmi(add_func), &if_notcallable);
GotoIfNot(IsCallable(CAST(add_func)), &if_notcallable);
Goto(&exit);
BIND(&if_notcallable);
ThrowTypeError(context, MessageTemplate::kPropertyNotFunction, add_func,
HeapConstant(add_func_name), collection);
BIND(&exit);
return add_func;
}
TNode<JSFunction> BaseCollectionsAssembler::GetConstructor(
Variant variant, TNode<Context> native_context) {
int index;
switch (variant) {
case kMap:
index = Context::JS_MAP_FUN_INDEX;
break;
case kSet:
index = Context::JS_SET_FUN_INDEX;
break;
case kWeakMap:
index = Context::JS_WEAK_MAP_FUN_INDEX;
break;
case kWeakSet:
index = Context::JS_WEAK_SET_FUN_INDEX;
break;
}
return CAST(LoadContextElement(native_context, index));
}
TNode<JSFunction> BaseCollectionsAssembler::GetInitialAddFunction(
Variant variant, TNode<Context> native_context) {
int index;
switch (variant) {
case kMap:
index = Context::MAP_SET_INDEX;
break;
case kSet:
index = Context::SET_ADD_INDEX;
break;
case kWeakMap:
index = Context::WEAKMAP_SET_INDEX;
break;
case kWeakSet:
index = Context::WEAKSET_ADD_INDEX;
break;
}
return CAST(LoadContextElement(native_context, index));
}
int BaseCollectionsAssembler::GetTableOffset(Variant variant) {
switch (variant) {
case kMap:
return JSMap::kTableOffset;
case kSet:
return JSSet::kTableOffset;
case kWeakMap:
return JSWeakMap::kTableOffset;
case kWeakSet:
return JSWeakSet::kTableOffset;
}
UNREACHABLE();
}
TNode<IntPtrT> BaseCollectionsAssembler::EstimatedInitialSize(
TNode<Object> initial_entries, TNode<BoolT> is_fast_jsarray) {
return Select<IntPtrT>(
is_fast_jsarray,
[=] { return SmiUntag(LoadFastJSArrayLength(CAST(initial_entries))); },
[=] { return IntPtrConstant(0); });
}
void BaseCollectionsAssembler::GotoIfNotJSReceiver(Node* const obj,
Label* if_not_receiver) {
GotoIf(TaggedIsSmi(obj), if_not_receiver);
GotoIfNot(IsJSReceiver(obj), if_not_receiver);
}
TNode<BoolT> BaseCollectionsAssembler::HasInitialCollectionPrototype(
Variant variant, TNode<Context> native_context, TNode<Object> collection) {
int initial_prototype_index;
switch (variant) {
case kMap:
initial_prototype_index = Context::INITIAL_MAP_PROTOTYPE_MAP_INDEX;
break;
case kSet:
initial_prototype_index = Context::INITIAL_SET_PROTOTYPE_MAP_INDEX;
break;
case kWeakMap:
initial_prototype_index = Context::INITIAL_WEAKMAP_PROTOTYPE_MAP_INDEX;
break;
case kWeakSet:
initial_prototype_index = Context::INITIAL_WEAKSET_PROTOTYPE_MAP_INDEX;
break;
}
TNode<Map> initial_prototype_map =
CAST(LoadContextElement(native_context, initial_prototype_index));
TNode<Map> collection_proto_map =
LoadMap(LoadMapPrototype(LoadMap(CAST(collection))));
return WordEqual(collection_proto_map, initial_prototype_map);
}
TNode<Object> BaseCollectionsAssembler::LoadAndNormalizeFixedArrayElement(
TNode<HeapObject> elements, TNode<IntPtrT> index) {
TNode<Object> element = LoadFixedArrayElement(elements, index);
return Select<Object>(IsTheHole(element), [=] { return UndefinedConstant(); },
[=] { return element; });
}
TNode<Object> BaseCollectionsAssembler::LoadAndNormalizeFixedDoubleArrayElement(
TNode<HeapObject> elements, TNode<IntPtrT> index) {
TVARIABLE(Object, entry);
Label if_hole(this, Label::kDeferred), next(this);
TNode<Float64T> element = UncheckedCast<Float64T>(LoadFixedDoubleArrayElement(
elements, index, MachineType::Float64(), 0, INTPTR_PARAMETERS, &if_hole));
{ // not hole
entry = AllocateHeapNumberWithValue(element);
Goto(&next);
}
BIND(&if_hole);
{
entry = UndefinedConstant();
Goto(&next);
}
BIND(&next);
return entry.value();
}
void BaseCollectionsAssembler::LoadKeyValue(
TNode<Context> context, TNode<Object> maybe_array, TVariable<Object>* key,
TVariable<Object>* value, Label* if_may_have_side_effects,
Label* if_exception, TVariable<Object>* var_exception) {
CSA_ASSERT(this, Word32BinaryNot(IsTheHole(maybe_array)));
Label exit(this), if_fast(this), if_slow(this, Label::kDeferred);
BranchIfFastJSArray(maybe_array, context, &if_fast, &if_slow);
BIND(&if_fast);
{
TNode<JSArray> array = CAST(maybe_array);
TNode<Smi> length = LoadFastJSArrayLength(array);
TNode<FixedArrayBase> elements = LoadElements(array);
TNode<Int32T> elements_kind = LoadMapElementsKind(LoadMap(array));
Label if_smiorobjects(this), if_doubles(this);
Branch(IsFastSmiOrTaggedElementsKind(elements_kind), &if_smiorobjects,
&if_doubles);
BIND(&if_smiorobjects);
{
Label if_one(this), if_two(this);
GotoIf(SmiGreaterThan(length, SmiConstant(1)), &if_two);
GotoIf(SmiEqual(length, SmiConstant(1)), &if_one);
{ // empty array
*key = UndefinedConstant();
*value = UndefinedConstant();
Goto(&exit);
}
BIND(&if_one);
{
*key = LoadAndNormalizeFixedArrayElement(elements, IntPtrConstant(0));
*value = UndefinedConstant();
Goto(&exit);
}
BIND(&if_two);
{
*key = LoadAndNormalizeFixedArrayElement(elements, IntPtrConstant(0));
*value = LoadAndNormalizeFixedArrayElement(elements, IntPtrConstant(1));
Goto(&exit);
}
}
BIND(&if_doubles);
{
Label if_one(this), if_two(this);
GotoIf(SmiGreaterThan(length, SmiConstant(1)), &if_two);
GotoIf(SmiEqual(length, SmiConstant(1)), &if_one);
{ // empty array
*key = UndefinedConstant();
*value = UndefinedConstant();
Goto(&exit);
}
BIND(&if_one);
{
*key = LoadAndNormalizeFixedDoubleArrayElement(elements,
IntPtrConstant(0));
*value = UndefinedConstant();
Goto(&exit);
}
BIND(&if_two);
{
*key = LoadAndNormalizeFixedDoubleArrayElement(elements,
IntPtrConstant(0));
*value = LoadAndNormalizeFixedDoubleArrayElement(elements,
IntPtrConstant(1));
Goto(&exit);
}
}
}
BIND(&if_slow);
{
Label if_notobject(this, Label::kDeferred);
GotoIfNotJSReceiver(maybe_array, &if_notobject);
if (if_may_have_side_effects != nullptr) {
// If the element is not a fast array, we cannot guarantee accessing the
// key and value won't execute user code that will break fast path
// assumptions.
Goto(if_may_have_side_effects);
} else {
*key = UncheckedCast<Object>(GetProperty(
context, maybe_array, isolate()->factory()->zero_string()));
GotoIfException(key->value(), if_exception, var_exception);
*value = UncheckedCast<Object>(GetProperty(
context, maybe_array, isolate()->factory()->one_string()));
GotoIfException(value->value(), if_exception, var_exception);
Goto(&exit);
}
BIND(&if_notobject);
{
Node* ret = CallRuntime(
Runtime::kThrowTypeError, context,
SmiConstant(MessageTemplate::kIteratorValueNotAnObject), maybe_array);
GotoIfException(ret, if_exception, var_exception);
Unreachable();
}
}
BIND(&exit);
}
class CollectionsBuiltinsAssembler : public BaseCollectionsAssembler {
public:
explicit CollectionsBuiltinsAssembler(compiler::CodeAssemblerState* state)
: BaseCollectionsAssembler(state) {}
protected:
template <typename IteratorType>
Node* AllocateJSCollectionIterator(Node* context, int map_index,
Node* collection);
TNode<Object> AllocateTable(Variant variant, TNode<Context> context,
TNode<IntPtrT> at_least_space_for);
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);
// 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 bigints.
// The {result} variable will contain the entry index if the key was found,
// or the hash code otherwise.
void SameValueZeroBigInt(Node* key, Node* candidate_key, Label* if_same,
Label* if_not_same);
template <typename CollectionType>
void FindOrderedHashTableEntryForBigIntKey(Node* context, Node* table,
Node* key, 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 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;
}
TNode<Object> CollectionsBuiltinsAssembler::AllocateTable(
Variant variant, TNode<Context> context,
TNode<IntPtrT> at_least_space_for) {
return CAST((variant == kMap || variant == kWeakMap)
? AllocateOrderedHashTable<OrderedHashMap>()
: AllocateOrderedHashTable<OrderedHashSet>());
}
TF_BUILTIN(MapConstructor, CollectionsBuiltinsAssembler) {
GenerateConstructor(kMap, isolate()->factory()->Map_string());
}
TF_BUILTIN(SetConstructor, CollectionsBuiltinsAssembler) {
GenerateConstructor(kSet, isolate()->factory()->Set_string());
}
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());
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_hash, MachineType::PointerRepresentation());
Label if_receiver(this), if_other(this), done(this);
Branch(IsJSReceiver(key), &if_receiver, &if_other);
BIND(&if_receiver);
{
var_hash.Bind(LoadJSReceiverIdentityHash(key));
Goto(&done);
}
BIND(&if_other);
{
var_hash.Bind(CallGetHashRaw(key));
Goto(&done);
}
BIND(&done);
return var_hash.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::FindOrderedHashTableEntryForBigIntKey(
Node* context, Node* table, Node* key, Variable* result, Label* entry_found,
Label* not_found) {
Node* hash = CallGetHashRaw(key);
CSA_ASSERT(this, IntPtrGreaterThanOrEqual(hash, IntPtrConstant(0)));
result->Bind(hash);
FindOrderedHashTableEntry<CollectionType>(
table, hash,
[&](Node* other_key, Label* if_same, Label* if_not_same) {
SameValueZeroBigInt(key, 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);
CSA_ASSERT(this, IntPtrGreaterThanOrEqual(hash, IntPtrConstant(0)));
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::SameValueZeroBigInt(Node* key,
Node* candidate_key,
Label* if_same,
Label* if_not_same) {
CSA_ASSERT(this, IsBigInt(key));
GotoIf(TaggedIsSmi(candidate_key), if_not_same);
GotoIfNot(IsBigInt(candidate_key), if_not_same);
Branch(WordEqual(CallRuntime(Runtime::kBigIntEqualToBigInt,
NoContextConstant(), key, 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);
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);
}
}
TF_BUILTIN(OrderedHashTableHealIndex, CollectionsBuiltinsAssembler) {
TNode<HeapObject> table = CAST(Parameter(Descriptor::kTable));
TNode<Smi> index = CAST(Parameter(Descriptor::kIndex));
Label return_index(this), return_zero(this);
// Check if we need to update the {index}.
GotoIfNot(SmiLessThan(SmiConstant(0), 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);