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builtins-collections-gen.cc
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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-collections-gen.h"
#include "src/builtins/builtins-constructor-gen.h"
#include "src/builtins/builtins-iterator-gen.h"
#include "src/builtins/builtins-utils-gen.h"
#include "src/codegen/code-stub-assembler.h"
#include "src/execution/protectors.h"
#include "src/heap/factory-inl.h"
#include "src/heap/heap-inl.h"
#include "src/objects/hash-table-inl.h"
#include "src/objects/js-collection.h"
#include "src/objects/ordered-hash-table.h"
#include "src/roots/roots.h"
namespace v8 {
namespace internal {
using compiler::Node;
template <class T>
using TVariable = compiler::TypedCodeAssemblerVariable<T>;
class BaseCollectionsAssembler : public CodeStubAssembler {
public:
explicit BaseCollectionsAssembler(compiler::CodeAssemblerState* state)
: CodeStubAssembler(state) {}
virtual ~BaseCollectionsAssembler() = default;
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<HeapObject> 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<JSObject> AllocateJSCollection(TNode<Context> context,
TNode<JSFunction> constructor,
TNode<JSReceiver> new_target);
// Fast path for constructing a collection instance if the constructor
// function has not been modified.
TNode<JSObject> AllocateJSCollectionFast(TNode<JSFunction> constructor);
// Fallback for constructing a collection instance if the constructor function
// has been modified.
TNode<JSObject> AllocateJSCollectionSlow(TNode<Context> context,
TNode<JSFunction> constructor,
TNode<JSReceiver> new_target);
// Allocates the backing store for a collection.
virtual TNode<HeapObject> AllocateTable(
Variant variant, TNode<IntPtrT> at_least_space_for) = 0;
// Main entry point for a collection constructor builtin.
void GenerateConstructor(Variant variant,
Handle<String> constructor_function_name,
TNode<Object> new_target, TNode<IntPtrT> argc,
TNode<Context> context);
// 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);
// Checks whether {collection}'s initial add/set function has been modified
// (depending on {variant}, loaded from {native_context}).
void GotoIfInitialAddFunctionModified(Variant variant,
TNode<NativeContext> native_context,
TNode<HeapObject> collection,
Label* if_modified);
// Gets root index for the name of the add/set function.
RootIndex GetAddFunctionNameIndex(Variant variant);
// 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(const TNode<Object> 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);
// Gets the initial prototype map for given collection {variant}.
TNode<Map> GetInitialCollectionPrototype(Variant variant,
TNode<Context> native_context);
// Loads an element from a fixed array. If the element is the hole, returns
// `undefined`.
TNode<Object> LoadAndNormalizeFixedArrayElement(TNode<FixedArray> 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);
};
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) {
compiler::ScopedExceptionHandler handler(this, if_exception, var_exception);
CSA_ASSERT(this, Word32BinaryNot(IsTheHole(key_value)));
if (variant == kMap || variant == kWeakMap) {
TorqueStructKeyValuePair pair =
if_may_have_side_effects != nullptr
? LoadKeyValuePairNoSideEffects(context, key_value,
if_may_have_side_effects)
: LoadKeyValuePair(context, key_value);
TNode<Object> key_n = pair.key;
TNode<Object> value_n = pair.value;
Call(context, add_function, collection, key_n, value_n);
} else {
DCHECK(variant == kSet || variant == kWeakSet);
Call(context, add_function, collection, key_value);
}
}
void BaseCollectionsAssembler::AddConstructorEntries(
Variant variant, TNode<Context> context, TNode<Context> native_context,
TNode<HeapObject> collection, TNode<Object> initial_entries) {
TVARIABLE(BoolT, use_fast_loop,
IsFastJSArrayWithNoCustomIteration(context, initial_entries));
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<HeapObject> table = AllocateTable(variant, at_least_space_for);
StoreObjectField(collection, GetTableOffset(variant), table);
GotoIf(IsNullOrUndefined(initial_entries), &exit);
GotoIfInitialAddFunctionModified(variant, CAST(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(
context, initial_entries_jsarray));
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
{
// Check that add/set function has not been modified.
Label if_not_modified(this), if_modified(this);
GotoIfInitialAddFunctionModified(variant, CAST(native_context),
collection, &if_modified);
Goto(&if_not_modified);
BIND(&if_modified);
Unreachable();
BIND(&if_not_modified);
}
CSA_ASSERT(this, TaggedEqual(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 = LoadElementsKind(fast_jsarray);
TNode<JSFunction> add_func = GetInitialAddFunction(variant, native_context);
CSA_ASSERT(this,
TaggedEqual(GetAddFunction(variant, native_context, collection),
add_func));
CSA_ASSERT(this, IsFastJSArrayWithNoCustomIteration(context, fast_jsarray));
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 = [&](TNode<IntPtrT> index) {
TNode<Object> element = LoadAndNormalizeFixedArrayElement(
CAST(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<IntPtrT>(IntPtrConstant(0), length, set_entry, 1,
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 = [&](TNode<IntPtrT> index) {
TNode<Object> entry = LoadAndNormalizeFixedDoubleArrayElement(
elements, UncheckedCast<IntPtrT>(index));
AddConstructorEntry(variant, context, collection, add_func, entry);
};
BuildFastLoop<IntPtrT>(IntPtrConstant(0), length, set_entry, 1,
IndexAdvanceMode::kPost);
Goto(&exit);
}
}
BIND(&exit);
#if DEBUG
CSA_ASSERT(this,
TaggedEqual(original_collection_map, LoadMap(CAST(collection))));
CSA_ASSERT(this,
TaggedEqual(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());
TorqueStructIteratorRecord iterator =
iterator_assembler.GetIterator(context, iterable);
CSA_ASSERT(this, Word32BinaryNot(IsUndefined(iterator.object)));
TNode<Map> fast_iterator_result_map = CAST(
LoadContextElement(native_context, Context::ITERATOR_RESULT_MAP_INDEX));
TVARIABLE(Object, var_exception);
Goto(&loop);
BIND(&loop);
{
TNode<JSReceiver> next = iterator_assembler.IteratorStep(
context, iterator, &exit, fast_iterator_result_map);
TNode<Object> next_value = 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);
{
IteratorCloseOnException(context, iterator);
CallRuntime(Runtime::kReThrow, context, var_exception.value());
Unreachable();
}
BIND(&exit);
}
RootIndex BaseCollectionsAssembler::GetAddFunctionNameIndex(Variant variant) {
switch (variant) {
case kMap:
case kWeakMap:
return RootIndex::kset_string;
case kSet:
case kWeakSet:
return RootIndex::kadd_string;
}
UNREACHABLE();
}
void BaseCollectionsAssembler::GotoIfInitialAddFunctionModified(
Variant variant, TNode<NativeContext> native_context,
TNode<HeapObject> collection, Label* if_modified) {
STATIC_ASSERT(JSCollection::kAddFunctionDescriptorIndex ==
JSWeakCollection::kAddFunctionDescriptorIndex);
// TODO(jgruber): Investigate if this should also fall back to full prototype
// verification.
static constexpr PrototypeCheckAssembler::Flags flags{
PrototypeCheckAssembler::kCheckPrototypePropertyConstness};
static constexpr int kNoContextIndex = -1;
STATIC_ASSERT(
(flags & PrototypeCheckAssembler::kCheckPrototypePropertyIdentity) == 0);
using DescriptorIndexNameValue =
PrototypeCheckAssembler::DescriptorIndexNameValue;
DescriptorIndexNameValue property_to_check{
JSCollection::kAddFunctionDescriptorIndex,
GetAddFunctionNameIndex(variant), kNoContextIndex};
PrototypeCheckAssembler prototype_check_assembler(
state(), flags, native_context,
GetInitialCollectionPrototype(variant, native_context),
Vector<DescriptorIndexNameValue>(&property_to_check, 1));
TNode<HeapObject> prototype = LoadMapPrototype(LoadMap(collection));
Label if_unmodified(this);
prototype_check_assembler.CheckAndBranch(prototype, &if_unmodified,
if_modified);
BIND(&if_unmodified);
}
TNode<JSObject> BaseCollectionsAssembler::AllocateJSCollection(
TNode<Context> context, TNode<JSFunction> constructor,
TNode<JSReceiver> new_target) {
TNode<BoolT> is_target_unmodified = TaggedEqual(constructor, new_target);
return Select<JSObject>(
is_target_unmodified,
[=] { return AllocateJSCollectionFast(constructor); },
[=] {
return AllocateJSCollectionSlow(context, constructor, new_target);
});
}
TNode<JSObject> BaseCollectionsAssembler::AllocateJSCollectionFast(
TNode<JSFunction> constructor) {
CSA_ASSERT(this, IsConstructorMap(LoadMap(constructor)));
TNode<Map> initial_map =
CAST(LoadJSFunctionPrototypeOrInitialMap(constructor));
return AllocateJSObjectFromMap(initial_map);
}
TNode<JSObject> BaseCollectionsAssembler::AllocateJSCollectionSlow(
TNode<Context> context, TNode<JSFunction> constructor,
TNode<JSReceiver> new_target) {
ConstructorBuiltinsAssembler constructor_assembler(this->state());
return constructor_assembler.EmitFastNewObject(context, constructor,
new_target);
}
void BaseCollectionsAssembler::GenerateConstructor(
Variant variant, Handle<String> constructor_function_name,
TNode<Object> new_target, TNode<IntPtrT> argc, TNode<Context> context) {
const int kIterableArg = 0;
CodeStubArguments args(this, argc);
TNode<Object> iterable = args.GetOptionalArgumentValue(kIterableArg);
Label if_undefined(this, Label::kDeferred);
GotoIf(IsUndefined(new_target), &if_undefined);
TNode<NativeContext> native_context = LoadNativeContext(context);
TNode<JSObject> collection = AllocateJSCollection(
context, GetConstructor(variant, native_context), CAST(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(const TNode<Object> obj,
Label* if_not_receiver) {
GotoIf(TaggedIsSmi(obj), if_not_receiver);
GotoIfNot(IsJSReceiver(CAST(obj)), if_not_receiver);
}
TNode<Map> BaseCollectionsAssembler::GetInitialCollectionPrototype(
Variant variant, TNode<Context> native_context) {
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;
}
return CAST(LoadContextElement(native_context, initial_prototype_index));
}
TNode<BoolT> BaseCollectionsAssembler::HasInitialCollectionPrototype(
Variant variant, TNode<Context> native_context, TNode<Object> collection) {
TNode<Map> collection_proto_map =
LoadMap(LoadMapPrototype(LoadMap(CAST(collection))));
return TaggedEqual(collection_proto_map,
GetInitialCollectionPrototype(variant, native_context));
}
TNode<Object> BaseCollectionsAssembler::LoadAndNormalizeFixedArrayElement(
TNode<FixedArray> elements, TNode<IntPtrT> index) {
TNode<Object> element = UnsafeLoadFixedArrayElement(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 =
LoadFixedDoubleArrayElement(CAST(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();
}
class CollectionsBuiltinsAssembler : public BaseCollectionsAssembler {
public:
explicit CollectionsBuiltinsAssembler(compiler::CodeAssemblerState* state)
: BaseCollectionsAssembler(state) {}
// Check whether |iterable| is a JS_MAP_KEY_ITERATOR_TYPE or
// JS_MAP_VALUE_ITERATOR_TYPE object that is not partially consumed and still
// has original iteration behavior.
void BranchIfIterableWithOriginalKeyOrValueMapIterator(TNode<Object> iterable,
TNode<Context> context,
Label* if_true,
Label* if_false);
// Check whether |iterable| is a JS_SET_TYPE or JS_SET_VALUE_ITERATOR_TYPE
// object that still has original iteration behavior. In case of the iterator,
// the iterator also must not have been partially consumed.
void BranchIfIterableWithOriginalValueSetIterator(TNode<Object> iterable,
TNode<Context> context,
Label* if_true,
Label* if_false);
protected:
template <typename IteratorType>
TNode<HeapObject> AllocateJSCollectionIterator(
const TNode<Context> context, int map_index,
const TNode<HeapObject> collection);
TNode<HeapObject> AllocateTable(Variant variant,
TNode<IntPtrT> at_least_space_for) override;
TNode<IntPtrT> GetHash(const TNode<HeapObject> key);
TNode<IntPtrT> CallGetHashRaw(const TNode<HeapObject> key);
TNode<Smi> CallGetOrCreateHashRaw(const TNode<HeapObject> key);
// Transitions the iterator to the non obsolete backing store.
// This is a NOP if the [table] is not obsolete.
template <typename TableType>
using UpdateInTransition = std::function<void(const TNode<TableType> table,
const TNode<IntPtrT> index)>;
template <typename TableType>
std::pair<TNode<TableType>, TNode<IntPtrT>> Transition(
const TNode<TableType> table, const TNode<IntPtrT> index,
UpdateInTransition<TableType> const& update_in_transition);
template <typename IteratorType, typename TableType>
std::pair<TNode<TableType>, TNode<IntPtrT>> TransitionAndUpdate(
const TNode<IteratorType> iterator);
template <typename TableType>
std::tuple<TNode<Object>, TNode<IntPtrT>, TNode<IntPtrT>> NextSkipHoles(
TNode<TableType> table, TNode<IntPtrT> 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(TNode<CollectionType> table,
TNode<Smi> key_tagged,
TVariable<IntPtrT>* result,
Label* entry_found, Label* not_found);
void SameValueZeroSmi(TNode<Smi> key_smi, TNode<Object> 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(TNode<Float64T> key_float,
TNode<Object> candidate_key, Label* if_same,
Label* if_not_same);
template <typename CollectionType>
void FindOrderedHashTableEntryForHeapNumberKey(
TNode<CollectionType> table, TNode<HeapNumber> key_heap_number,
TVariable<IntPtrT>* 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(TNode<BigInt> key, TNode<Object> candidate_key,
Label* if_same, Label* if_not_same);
template <typename CollectionType>
void FindOrderedHashTableEntryForBigIntKey(TNode<CollectionType> table,
TNode<BigInt> key_big_int,
TVariable<IntPtrT>* 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(TNode<CollectionType> table,
TNode<String> key_tagged,
TVariable<IntPtrT>* result,
Label* entry_found,
Label* not_found);
TNode<IntPtrT> ComputeStringHash(TNode<String> string_key);
void SameValueZeroString(TNode<String> key_string,
TNode<Object> 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(TNode<CollectionType> table,
TNode<HeapObject> key_heap_object,
TVariable<IntPtrT>* result,
Label* entry_found,
Label* not_found);
template <typename CollectionType>
void TryLookupOrderedHashTableIndex(const TNode<CollectionType> table,
const TNode<Object> key,
TVariable<IntPtrT>* result,
Label* if_entry_found,
Label* if_not_found);
const TNode<Object> NormalizeNumberKey(const TNode<Object> key);
void StoreOrderedHashMapNewEntry(const TNode<OrderedHashMap> table,
const TNode<Object> key,
const TNode<Object> value,
const TNode<IntPtrT> hash,
const TNode<IntPtrT> number_of_buckets,
const TNode<IntPtrT> occupancy);
void StoreOrderedHashSetNewEntry(const TNode<OrderedHashSet> table,
const TNode<Object> key,
const TNode<IntPtrT> hash,
const TNode<IntPtrT> number_of_buckets,
const TNode<IntPtrT> occupancy);
// Create a JSArray with PACKED_ELEMENTS kind from a Map.prototype.keys() or
// Map.prototype.values() iterator. The iterator is assumed to satisfy
// IterableWithOriginalKeyOrValueMapIterator. This function will skip the
// iterator and iterate directly on the underlying hash table. In the end it
// will update the state of the iterator to 'exhausted'.
TNode<JSArray> MapIteratorToList(TNode<Context> context,
TNode<JSMapIterator> iterator);
// Create a JSArray with PACKED_ELEMENTS kind from a Set.prototype.keys() or
// Set.prototype.values() iterator, or a Set. The |iterable| is assumed to
// satisfy IterableWithOriginalValueSetIterator. This function will skip the
// iterator and iterate directly on the underlying hash table. In the end, if
// |iterable| is an iterator, it will update the state of the iterator to
// 'exhausted'.
TNode<JSArray> SetOrSetIteratorToList(TNode<Context> context,
TNode<HeapObject> iterable);
void BranchIfMapIteratorProtectorValid(Label* if_true, Label* if_false);
void BranchIfSetIteratorProtectorValid(Label* if_true, Label* if_false);
// 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(
const TNode<CollectionType> table, const TNode<IntPtrT> hash,
const std::function<void(TNode<Object>, Label*, Label*)>& key_compare,
TVariable<IntPtrT>* entry_start_position, Label* entry_found,
Label* not_found);
TNode<Word32T> ComputeUnseededHash(TNode<IntPtrT> key);
};
template <typename CollectionType>
void CollectionsBuiltinsAssembler::FindOrderedHashTableEntry(
const TNode<CollectionType> table, const TNode<IntPtrT> hash,
const std::function<void(TNode<Object>, Label*, Label*)>& key_compare,
TVariable<IntPtrT>* entry_start_position, Label* entry_found,
Label* not_found) {
// Get the index of the bucket.
const TNode<IntPtrT> number_of_buckets =
SmiUntag(CAST(UnsafeLoadFixedArrayElement(
table, CollectionType::NumberOfBucketsIndex())));
const TNode<WordT> bucket =
WordAnd(hash, IntPtrSub(number_of_buckets, IntPtrConstant(1)));
const TNode<IntPtrT> first_entry = SmiUntag(CAST(UnsafeLoadFixedArrayElement(
table, bucket, CollectionType::HashTableStartIndex() * kTaggedSize)));
// Walk the bucket chain.
TNode<IntPtrT> entry_start;
Label if_key_found(this);
{
TVARIABLE(IntPtrT, var_entry, 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(IntPtrEqual(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(
CAST(UnsafeLoadFixedArrayElement(
table, CollectionType::NumberOfElementsIndex())),
CAST(UnsafeLoadFixedArrayElement(
table, CollectionType::NumberOfDeletedElementsIndex()))))));
// 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.
const TNode<Object> candidate_key = UnsafeLoadFixedArrayElement(
table, entry_start,
CollectionType::HashTableStartIndex() * kTaggedSize);
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 = SmiUntag(CAST(UnsafeLoadFixedArrayElement(
table, entry_start,
(CollectionType::HashTableStartIndex() + CollectionType::kChainOffset) *
kTaggedSize)));
Goto(&loop);
}
BIND(&if_key_found);
*entry_start_position = entry_start;
Goto(entry_found);
}
template <typename IteratorType>
TNode<HeapObject> CollectionsBuiltinsAssembler::AllocateJSCollectionIterator(
const TNode<Context> context, int map_index,
const TNode<HeapObject> collection) {
const TNode<Object> table =
LoadObjectField(collection, JSCollection::kTableOffset);
const TNode<NativeContext> native_context = LoadNativeContext(context);
const TNode<Map> iterator_map =
CAST(LoadContextElement(native_context, map_index));
const TNode<HeapObject> iterator =
AllocateInNewSpace(IteratorType::kHeaderSize);
StoreMapNoWriteBarrier(iterator, iterator_map);
StoreObjectFieldRoot(iterator, IteratorType::kPropertiesOrHashOffset,
RootIndex::kEmptyFixedArray);
StoreObjectFieldRoot(iterator, IteratorType::kElementsOffset,
RootIndex::kEmptyFixedArray);
StoreObjectFieldNoWriteBarrier(iterator, IteratorType::kTableOffset, table);
StoreObjectFieldNoWriteBarrier(iterator, IteratorType::kIndexOffset,
SmiConstant(0));
return iterator;
}
TNode<HeapObject> CollectionsBuiltinsAssembler::AllocateTable(
Variant variant, TNode<IntPtrT> at_least_space_for) {
if (variant == kMap || variant == kWeakMap) {
return AllocateOrderedHashTable<OrderedHashMap>();
} else {
return AllocateOrderedHashTable<OrderedHashSet>();
}
}
TF_BUILTIN(MapConstructor, CollectionsBuiltinsAssembler) {
TNode<Object> new_target = CAST(Parameter(Descriptor::kJSNewTarget));
TNode<IntPtrT> argc = ChangeInt32ToIntPtr(
UncheckedCast<Int32T>(Parameter(Descriptor::kJSActualArgumentsCount)));
TNode<Context> context = CAST(Parameter(Descriptor::kContext));
GenerateConstructor(kMap, isolate()->factory()->Map_string(), new_target,
argc, context);
}
TF_BUILTIN(SetConstructor, CollectionsBuiltinsAssembler) {
TNode<Object> new_target = CAST(Parameter(Descriptor::kJSNewTarget));
TNode<IntPtrT> argc = ChangeInt32ToIntPtr(
UncheckedCast<Int32T>(Parameter(Descriptor::kJSActualArgumentsCount)));
TNode<Context> context = CAST(Parameter(Descriptor::kContext));
GenerateConstructor(kSet, isolate()->factory()->Set_string(), new_target,
argc, context);
}
TNode<Smi> CollectionsBuiltinsAssembler::CallGetOrCreateHashRaw(
const TNode<HeapObject> key) {
const TNode<ExternalReference> function_addr =
ExternalConstant(ExternalReference::get_or_create_hash_raw());
const TNode<ExternalReference> isolate_ptr =
ExternalConstant(ExternalReference::isolate_address(isolate()));
MachineType type_ptr = MachineType::Pointer();
MachineType type_tagged = MachineType::AnyTagged();
TNode<Smi> result = CAST(CallCFunction(function_addr, type_tagged,
std::make_pair(type_ptr, isolate_ptr),
std::make_pair(type_tagged, key)));
return result;
}
TNode<IntPtrT> CollectionsBuiltinsAssembler::CallGetHashRaw(
const TNode<HeapObject> key) {
const TNode<ExternalReference> function_addr =
ExternalConstant(ExternalReference::orderedhashmap_gethash_raw());
const TNode<ExternalReference> isolate_ptr =
ExternalConstant(ExternalReference::isolate_address(isolate()));
MachineType type_ptr = MachineType::Pointer();
MachineType type_tagged = MachineType::AnyTagged();
TNode<Smi> result = CAST(CallCFunction(function_addr, type_tagged,
std::make_pair(type_ptr, isolate_ptr),
std::make_pair(type_tagged, key)));
return SmiUntag(result);
}
TNode<IntPtrT> CollectionsBuiltinsAssembler::GetHash(
const TNode<HeapObject> key) {
TVARIABLE(IntPtrT, var_hash);
Label if_receiver(this), if_other(this), done(this);
Branch(IsJSReceiver(key), &if_receiver, &if_other);
BIND(&if_receiver);
{
var_hash = LoadJSReceiverIdentityHash(key);
Goto(&done);
}
BIND(&if_other);
{
var_hash = CallGetHashRaw(key);
Goto(&done);
}
BIND(&done);
return var_hash.value();
}
void CollectionsBuiltinsAssembler::SameValueZeroSmi(TNode<Smi> key_smi,
TNode<Object> candidate_key,
Label* if_same,
Label* if_not_same) {
// If the key is the same, we are done.
GotoIf(TaggedEqual(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(CAST(candidate_key)), if_not_same);
const TNode<Float64T> candidate_key_number =
LoadHeapNumberValue(CAST(candidate_key));
const TNode<Float64T> key_number = SmiToFloat64(key_smi);
GotoIf(Float64Equal(candidate_key_number, key_number), if_same);
Goto(if_not_same);
}
void CollectionsBuiltinsAssembler::BranchIfMapIteratorProtectorValid(
Label* if_true, Label* if_false) {
TNode<PropertyCell> protector_cell = MapIteratorProtectorConstant();
DCHECK(isolate()->heap()->map_iterator_protector().IsPropertyCell());
Branch(
TaggedEqual(LoadObjectField(protector_cell, PropertyCell::kValueOffset),
SmiConstant(Protectors::kProtectorValid)),
if_true, if_false);
}
void CollectionsBuiltinsAssembler::
BranchIfIterableWithOriginalKeyOrValueMapIterator(TNode<Object> iterator,
TNode<Context> context,
Label* if_true,
Label* if_false) {
Label if_key_or_value_iterator(this), extra_checks(this);
// Check if iterator is a keys or values JSMapIterator.
GotoIf(TaggedIsSmi(iterator), if_false);
TNode<Map> iter_map = LoadMap(CAST(iterator));
const TNode<Uint16T> instance_type = LoadMapInstanceType(iter_map);
GotoIf(InstanceTypeEqual(instance_type, JS_MAP_KEY_ITERATOR_TYPE),
&if_key_or_value_iterator);
Branch(InstanceTypeEqual(instance_type, JS_MAP_VALUE_ITERATOR_TYPE),
&if_key_or_value_iterator, if_false);
BIND(&if_key_or_value_iterator);
// Check that the iterator is not partially consumed.
const TNode<Object> index =
LoadObjectField(CAST(iterator), JSMapIterator::kIndexOffset);
GotoIfNot(TaggedEqual(index, SmiConstant(0)), if_false);
BranchIfMapIteratorProtectorValid(&extra_checks, if_false);
BIND(&extra_checks);
// Check if the iterator object has the original %MapIteratorPrototype%.
const TNode<NativeContext> native_context = LoadNativeContext(context);
const TNode<Object> initial_map_iter_proto = LoadContextElement(
native_context, Context::INITIAL_MAP_ITERATOR_PROTOTYPE_INDEX);
const TNode<HeapObject> map_iter_proto = LoadMapPrototype(iter_map);
GotoIfNot(TaggedEqual(map_iter_proto, initial_map_iter_proto), if_false);
// Check if the original MapIterator prototype has the original
// %IteratorPrototype%.
const TNode<Object> initial_iter_proto = LoadContextElement(
native_context, Context::INITIAL_ITERATOR_PROTOTYPE_INDEX);
const TNode<HeapObject> iter_proto =
LoadMapPrototype(LoadMap(map_iter_proto));