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builtins-array-gen.cc
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builtins-array-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-string-gen.h"
#include "src/builtins/builtins-utils-gen.h"
#include "src/builtins/builtins.h"
#include "src/code-stub-assembler.h"
#include "src/factory-inl.h"
#include "src/frame-constants.h"
namespace v8 {
namespace internal {
class ArrayBuiltinCodeStubAssembler : public CodeStubAssembler {
public:
explicit ArrayBuiltinCodeStubAssembler(compiler::CodeAssemblerState* state)
: CodeStubAssembler(state),
k_(this, MachineRepresentation::kTagged),
a_(this, MachineRepresentation::kTagged),
to_(this, MachineRepresentation::kTagged, SmiConstant(0)),
fully_spec_compliant_(this, {&k_, &a_, &to_}) {}
typedef std::function<void(ArrayBuiltinCodeStubAssembler* masm)>
BuiltinResultGenerator;
typedef std::function<Node*(ArrayBuiltinCodeStubAssembler* masm,
Node* k_value, Node* k)>
CallResultProcessor;
typedef std::function<void(ArrayBuiltinCodeStubAssembler* masm)>
PostLoopAction;
enum class MissingPropertyMode { kSkip, kUseUndefined };
void FindResultGenerator() { a_.Bind(UndefinedConstant()); }
Node* FindProcessor(Node* k_value, Node* k) {
Node* value = CallJS(CodeFactory::Call(isolate()), context(), callbackfn(),
this_arg(), k_value, k, o());
Label false_continue(this), return_true(this);
BranchIfToBooleanIsTrue(value, &return_true, &false_continue);
BIND(&return_true);
ReturnFromBuiltin(k_value);
BIND(&false_continue);
return a();
}
void FindIndexResultGenerator() { a_.Bind(SmiConstant(-1)); }
Node* FindIndexProcessor(Node* k_value, Node* k) {
Node* value = CallJS(CodeFactory::Call(isolate()), context(), callbackfn(),
this_arg(), k_value, k, o());
Label false_continue(this), return_true(this);
BranchIfToBooleanIsTrue(value, &return_true, &false_continue);
BIND(&return_true);
ReturnFromBuiltin(k);
BIND(&false_continue);
return a();
}
void ForEachResultGenerator() { a_.Bind(UndefinedConstant()); }
Node* ForEachProcessor(Node* k_value, Node* k) {
CallJS(CodeFactory::Call(isolate()), context(), callbackfn(), this_arg(),
k_value, k, o());
return a();
}
void SomeResultGenerator() { a_.Bind(FalseConstant()); }
Node* SomeProcessor(Node* k_value, Node* k) {
Node* value = CallJS(CodeFactory::Call(isolate()), context(), callbackfn(),
this_arg(), k_value, k, o());
Label false_continue(this), return_true(this);
BranchIfToBooleanIsTrue(value, &return_true, &false_continue);
BIND(&return_true);
ReturnFromBuiltin(TrueConstant());
BIND(&false_continue);
return a();
}
void EveryResultGenerator() { a_.Bind(TrueConstant()); }
Node* EveryProcessor(Node* k_value, Node* k) {
Node* value = CallJS(CodeFactory::Call(isolate()), context(), callbackfn(),
this_arg(), k_value, k, o());
Label true_continue(this), return_false(this);
BranchIfToBooleanIsTrue(value, &true_continue, &return_false);
BIND(&return_false);
ReturnFromBuiltin(FalseConstant());
BIND(&true_continue);
return a();
}
void ReduceResultGenerator() { return a_.Bind(this_arg()); }
Node* ReduceProcessor(Node* k_value, Node* k) {
VARIABLE(result, MachineRepresentation::kTagged);
Label done(this, {&result}), initial(this);
GotoIf(WordEqual(a(), TheHoleConstant()), &initial);
result.Bind(CallJS(CodeFactory::Call(isolate()), context(), callbackfn(),
UndefinedConstant(), a(), k_value, k, o()));
Goto(&done);
BIND(&initial);
result.Bind(k_value);
Goto(&done);
BIND(&done);
return result.value();
}
void ReducePostLoopAction() {
Label ok(this);
GotoIf(WordNotEqual(a(), TheHoleConstant()), &ok);
ThrowTypeError(context(), MessageTemplate::kReduceNoInitial);
BIND(&ok);
}
void FilterResultGenerator() {
// 7. Let A be ArraySpeciesCreate(O, 0).
// This version of ArraySpeciesCreate will create with the correct
// ElementsKind in the fast case.
ArraySpeciesCreate();
}
Node* FilterProcessor(Node* k_value, Node* k) {
// ii. Let selected be ToBoolean(? Call(callbackfn, T, kValue, k, O)).
Node* selected = CallJS(CodeFactory::Call(isolate()), context(),
callbackfn(), this_arg(), k_value, k, o());
Label true_continue(this, &to_), false_continue(this);
BranchIfToBooleanIsTrue(selected, &true_continue, &false_continue);
BIND(&true_continue);
// iii. If selected is true, then...
{
Label after_work(this, &to_);
Node* kind = nullptr;
// If a() is a JSArray, we can have a fast path.
Label fast(this);
Label runtime(this);
Label object_push_pre(this), object_push(this), double_push(this);
BranchIfFastJSArray(a(), context(), &fast, &runtime);
BIND(&fast);
{
GotoIf(SmiNotEqual(LoadJSArrayLength(a()), to_.value()), &runtime);
kind = EnsureArrayPushable(a(), &runtime);
GotoIf(IsElementsKindGreaterThan(kind, HOLEY_SMI_ELEMENTS),
&object_push_pre);
BuildAppendJSArray(HOLEY_SMI_ELEMENTS, a(), k_value, &runtime);
Goto(&after_work);
}
BIND(&object_push_pre);
{
Branch(IsElementsKindGreaterThan(kind, HOLEY_ELEMENTS), &double_push,
&object_push);
}
BIND(&object_push);
{
BuildAppendJSArray(HOLEY_ELEMENTS, a(), k_value, &runtime);
Goto(&after_work);
}
BIND(&double_push);
{
BuildAppendJSArray(HOLEY_DOUBLE_ELEMENTS, a(), k_value, &runtime);
Goto(&after_work);
}
BIND(&runtime);
{
// 1. Perform ? CreateDataPropertyOrThrow(A, ToString(to), kValue).
CallRuntime(Runtime::kCreateDataProperty, context(), a(), to_.value(),
k_value);
Goto(&after_work);
}
BIND(&after_work);
{
// 2. Increase to by 1.
to_.Bind(NumberInc(to_.value()));
Goto(&false_continue);
}
}
BIND(&false_continue);
return a();
}
void MapResultGenerator() { ArraySpeciesCreate(len_); }
void TypedArrayMapResultGenerator() {
// 6. Let A be ? TypedArraySpeciesCreate(O, len).
Node* a = TypedArraySpeciesCreateByLength(context(), o(), len_);
// In the Spec and our current implementation, the length check is already
// performed in TypedArraySpeciesCreate.
CSA_ASSERT(this,
SmiLessThanOrEqual(
len_, LoadObjectField(a, JSTypedArray::kLengthOffset)));
fast_typed_array_target_ = Word32Equal(LoadInstanceType(LoadElements(o_)),
LoadInstanceType(LoadElements(a)));
a_.Bind(a);
}
Node* SpecCompliantMapProcessor(Node* k_value, Node* k) {
// i. Let kValue be ? Get(O, Pk). Performed by the caller of
// SpecCompliantMapProcessor.
// ii. Let mapped_value be ? Call(callbackfn, T, kValue, k, O).
Node* mapped_value = CallJS(CodeFactory::Call(isolate()), context(),
callbackfn(), this_arg(), k_value, k, o());
// iii. Perform ? CreateDataPropertyOrThrow(A, Pk, mapped_value).
CallRuntime(Runtime::kCreateDataProperty, context(), a(), k, mapped_value);
return a();
}
Node* FastMapProcessor(Node* k_value, Node* k) {
// i. Let kValue be ? Get(O, Pk). Performed by the caller of
// FastMapProcessor.
// ii. Let mapped_value be ? Call(callbackfn, T, kValue, k, O).
Node* mapped_value = CallJS(CodeFactory::Call(isolate()), context(),
callbackfn(), this_arg(), k_value, k, o());
// mode is SMI_PARAMETERS because k has tagged representation.
ParameterMode mode = SMI_PARAMETERS;
Label runtime(this), finished(this);
Label transition_pre(this), transition_smi_fast(this),
transition_smi_double(this);
Label array_not_smi(this), array_fast(this), array_double(this);
Node* kind = LoadMapElementsKind(LoadMap(a()));
Node* elements = LoadElements(a());
GotoIf(IsElementsKindGreaterThan(kind, HOLEY_SMI_ELEMENTS), &array_not_smi);
TryStoreArrayElement(HOLEY_SMI_ELEMENTS, mode, &transition_pre, elements, k,
mapped_value);
Goto(&finished);
BIND(&transition_pre);
{
// array is smi. Value is either tagged or a heap number.
CSA_ASSERT(this, TaggedIsNotSmi(mapped_value));
GotoIf(IsHeapNumberMap(LoadMap(mapped_value)), &transition_smi_double);
Goto(&transition_smi_fast);
}
BIND(&array_not_smi);
{
Branch(IsElementsKindGreaterThan(kind, HOLEY_ELEMENTS), &array_double,
&array_fast);
}
BIND(&transition_smi_fast);
{
// iii. Perform ? CreateDataPropertyOrThrow(A, Pk, mapped_value).
Node* const native_context = LoadNativeContext(context());
Node* const fast_map = LoadContextElement(
native_context, Context::JS_ARRAY_HOLEY_ELEMENTS_MAP_INDEX);
// Since this transition is only a map change, just do it right here.
// Since a() doesn't have an allocation site, it's safe to do the
// map store directly, otherwise I'd call TransitionElementsKind().
StoreMap(a(), fast_map);
Goto(&array_fast);
}
BIND(&array_fast);
{
TryStoreArrayElement(HOLEY_ELEMENTS, mode, &runtime, elements, k,
mapped_value);
Goto(&finished);
}
BIND(&transition_smi_double);
{
// iii. Perform ? CreateDataPropertyOrThrow(A, Pk, mapped_value).
Node* const native_context = LoadNativeContext(context());
Node* const double_map = LoadContextElement(
native_context, Context::JS_ARRAY_HOLEY_DOUBLE_ELEMENTS_MAP_INDEX);
CallStub(CodeFactory::TransitionElementsKind(
isolate(), HOLEY_SMI_ELEMENTS, HOLEY_DOUBLE_ELEMENTS, true),
context(), a(), double_map);
Goto(&array_double);
}
BIND(&array_double);
{
// TODO(mvstanton): If we use a variable for elements and bind it
// appropriately, we can avoid an extra load of elements by binding the
// value only after a transition from smi to double.
elements = LoadElements(a());
// If the mapped_value isn't a number, this will bail out to the runtime
// to make the transition.
TryStoreArrayElement(HOLEY_DOUBLE_ELEMENTS, mode, &runtime, elements, k,
mapped_value);
Goto(&finished);
}
BIND(&runtime);
{
// iii. Perform ? CreateDataPropertyOrThrow(A, Pk, mapped_value).
CallRuntime(Runtime::kCreateDataProperty, context(), a(), k,
mapped_value);
Goto(&finished);
}
BIND(&finished);
return a();
}
// See tc39.github.io/ecma262/#sec-%typedarray%.prototype.map.
Node* TypedArrayMapProcessor(Node* k_value, Node* k) {
// 8. c. Let mapped_value be ? Call(callbackfn, T, « kValue, k, O »).
Node* mapped_value = CallJS(CodeFactory::Call(isolate()), context(),
callbackfn(), this_arg(), k_value, k, o());
Label fast(this), slow(this), done(this), detached(this, Label::kDeferred);
// 8. d. Perform ? Set(A, Pk, mapped_value, true).
// Since we know that A is a TypedArray, this always ends up in
// #sec-integer-indexed-exotic-objects-set-p-v-receiver and then
// tc39.github.io/ecma262/#sec-integerindexedelementset .
Branch(fast_typed_array_target_, &fast, &slow);
BIND(&fast);
// #sec-integerindexedelementset 3. Let numValue be ? ToNumber(value).
Node* num_value = ToNumber(context(), mapped_value);
// The only way how this can bailout is because of a detached buffer.
EmitElementStore(a(), k, num_value, false, source_elements_kind_,
KeyedAccessStoreMode::STANDARD_STORE, &detached);
Goto(&done);
BIND(&slow);
CallRuntime(Runtime::kSetProperty, context(), a(), k, mapped_value,
SmiConstant(LanguageMode::kStrict));
Goto(&done);
BIND(&detached);
// tc39.github.io/ecma262/#sec-integerindexedelementset
// 5. If IsDetachedBuffer(buffer) is true, throw a TypeError exception.
ThrowTypeError(context_, MessageTemplate::kDetachedOperation, name_);
BIND(&done);
return a();
}
void NullPostLoopAction() {}
protected:
Node* context() { return context_; }
Node* receiver() { return receiver_; }
Node* new_target() { return new_target_; }
Node* argc() { return argc_; }
Node* o() { return o_; }
Node* len() { return len_; }
Node* callbackfn() { return callbackfn_; }
Node* this_arg() { return this_arg_; }
Node* k() { return k_.value(); }
Node* a() { return a_.value(); }
void ReturnFromBuiltin(Node* value) {
if (argc_ == nullptr) {
Return(value);
} else {
// argc_ doesn't include the receiver, so it has to be added back in
// manually.
PopAndReturn(IntPtrAdd(argc_, IntPtrConstant(1)), value);
}
}
void InitIteratingArrayBuiltinBody(Node* context, Node* receiver,
Node* callbackfn, Node* this_arg,
Node* new_target, Node* argc) {
context_ = context;
receiver_ = receiver;
new_target_ = new_target;
callbackfn_ = callbackfn;
this_arg_ = this_arg;
argc_ = argc;
}
void GenerateIteratingArrayBuiltinBody(
const char* name, const BuiltinResultGenerator& generator,
const CallResultProcessor& processor, const PostLoopAction& action,
const Callable& slow_case_continuation,
MissingPropertyMode missing_property_mode,
ForEachDirection direction = ForEachDirection::kForward) {
Label non_array(this), array_changes(this, {&k_, &a_, &to_});
// TODO(danno): Seriously? Do we really need to throw the exact error
// message on null and undefined so that the webkit tests pass?
Label throw_null_undefined_exception(this, Label::kDeferred);
GotoIf(IsNullOrUndefined(receiver()), &throw_null_undefined_exception);
// By the book: taken directly from the ECMAScript 2015 specification
// 1. Let O be ToObject(this value).
// 2. ReturnIfAbrupt(O)
o_ = CallBuiltin(Builtins::kToObject, context(), receiver());
// 3. Let len be ToLength(Get(O, "length")).
// 4. ReturnIfAbrupt(len).
VARIABLE(merged_length, MachineRepresentation::kTagged);
Label has_length(this, &merged_length), not_js_array(this);
GotoIf(DoesntHaveInstanceType(o(), JS_ARRAY_TYPE), ¬_js_array);
merged_length.Bind(LoadJSArrayLength(o()));
Goto(&has_length);
BIND(¬_js_array);
Node* len_property =
GetProperty(context(), o(), isolate()->factory()->length_string());
merged_length.Bind(ToLength_Inline(context(), len_property));
Goto(&has_length);
BIND(&has_length);
len_ = merged_length.value();
// 5. If IsCallable(callbackfn) is false, throw a TypeError exception.
Label type_exception(this, Label::kDeferred);
Label done(this);
GotoIf(TaggedIsSmi(callbackfn()), &type_exception);
Branch(IsCallableMap(LoadMap(callbackfn())), &done, &type_exception);
BIND(&throw_null_undefined_exception);
ThrowTypeError(context(), MessageTemplate::kCalledOnNullOrUndefined, name);
BIND(&type_exception);
ThrowTypeError(context(), MessageTemplate::kCalledNonCallable,
callbackfn());
BIND(&done);
// 6. If thisArg was supplied, let T be thisArg; else let T be undefined.
// [Already done by the arguments adapter]
if (direction == ForEachDirection::kForward) {
// 7. Let k be 0.
k_.Bind(SmiConstant(0));
} else {
k_.Bind(NumberDec(len()));
}
generator(this);
HandleFastElements(processor, action, &fully_spec_compliant_, direction,
missing_property_mode);
BIND(&fully_spec_compliant_);
Node* result =
CallStub(slow_case_continuation, context(), receiver(), callbackfn(),
this_arg(), a_.value(), o(), k_.value(), len(), to_.value());
ReturnFromBuiltin(result);
}
void InitIteratingArrayBuiltinLoopContinuation(Node* context, Node* receiver,
Node* callbackfn,
Node* this_arg, Node* a,
Node* o, Node* initial_k,
Node* len, Node* to) {
context_ = context;
this_arg_ = this_arg;
callbackfn_ = callbackfn;
argc_ = nullptr;
a_.Bind(a);
k_.Bind(initial_k);
o_ = o;
len_ = len;
to_.Bind(to);
}
void GenerateIteratingTypedArrayBuiltinBody(
const char* name, const BuiltinResultGenerator& generator,
const CallResultProcessor& processor, const PostLoopAction& action,
ForEachDirection direction = ForEachDirection::kForward) {
name_ = name;
// ValidateTypedArray: tc39.github.io/ecma262/#sec-validatetypedarray
Label throw_not_typed_array(this, Label::kDeferred),
throw_detached(this, Label::kDeferred);
GotoIf(TaggedIsSmi(receiver_), &throw_not_typed_array);
GotoIfNot(HasInstanceType(receiver_, JS_TYPED_ARRAY_TYPE),
&throw_not_typed_array);
o_ = receiver_;
Node* array_buffer = LoadObjectField(o_, JSTypedArray::kBufferOffset);
GotoIf(IsDetachedBuffer(array_buffer), &throw_detached);
len_ = LoadObjectField(o_, JSTypedArray::kLengthOffset);
Label throw_not_callable(this, Label::kDeferred);
Label distinguish_types(this);
GotoIf(TaggedIsSmi(callbackfn_), &throw_not_callable);
Branch(IsCallableMap(LoadMap(callbackfn_)), &distinguish_types,
&throw_not_callable);
BIND(&throw_not_typed_array);
ThrowTypeError(context_, MessageTemplate::kNotTypedArray);
BIND(&throw_detached);
ThrowTypeError(context_, MessageTemplate::kDetachedOperation, name_);
BIND(&throw_not_callable);
ThrowTypeError(context_, MessageTemplate::kCalledNonCallable, callbackfn_);
Label unexpected_instance_type(this);
BIND(&unexpected_instance_type);
Unreachable();
std::vector<int32_t> instance_types = {
#define INSTANCE_TYPE(Type, type, TYPE, ctype, size) FIXED_##TYPE##_ARRAY_TYPE,
TYPED_ARRAYS(INSTANCE_TYPE)
#undef INSTANCE_TYPE
};
std::vector<Label> labels;
for (size_t i = 0; i < instance_types.size(); ++i) {
labels.push_back(Label(this));
}
std::vector<Label*> label_ptrs;
for (Label& label : labels) {
label_ptrs.push_back(&label);
}
BIND(&distinguish_types);
if (direction == ForEachDirection::kForward) {
k_.Bind(SmiConstant(0));
} else {
k_.Bind(NumberDec(len()));
}
Node* instance_type = LoadInstanceType(LoadElements(o_));
Switch(instance_type, &unexpected_instance_type, instance_types.data(),
label_ptrs.data(), labels.size());
for (size_t i = 0; i < labels.size(); ++i) {
BIND(&labels[i]);
Label done(this);
source_elements_kind_ = ElementsKindForInstanceType(
static_cast<InstanceType>(instance_types[i]));
generator(this);
// TODO(tebbi): Silently cancelling the loop on buffer detachment is a
// spec violation. Should go to &throw_detached and throw a TypeError
// instead.
VisitAllTypedArrayElements(array_buffer, processor, &done, direction);
Goto(&done);
// No exception, return success
BIND(&done);
action(this);
ReturnFromBuiltin(a_.value());
}
}
void GenerateIteratingArrayBuiltinLoopContinuation(
const CallResultProcessor& processor, const PostLoopAction& action,
MissingPropertyMode missing_property_mode,
ForEachDirection direction = ForEachDirection::kForward) {
Label loop(this, {&k_, &a_, &to_});
Label after_loop(this);
Goto(&loop);
BIND(&loop);
{
if (direction == ForEachDirection::kForward) {
// 8. Repeat, while k < len
GotoIfNumberGreaterThanOrEqual(k(), len_, &after_loop);
} else {
// OR
// 10. Repeat, while k >= 0
GotoIfNumberGreaterThanOrEqual(SmiConstant(-1), k(), &after_loop);
}
Label done_element(this, &to_);
// a. Let Pk be ToString(k).
// We never have to perform a ToString conversion as the above guards
// guarantee that we have a positive {k} which also is a valid array
// index in the range [0, 2^32-1).
CSA_ASSERT(this, IsNumberArrayIndex(k()));
if (missing_property_mode == MissingPropertyMode::kSkip) {
// b. Let kPresent be HasProperty(O, Pk).
// c. ReturnIfAbrupt(kPresent).
TNode<Oddball> k_present =
HasProperty(o(), k(), context(), kHasProperty);
// d. If kPresent is true, then
GotoIf(IsFalse(k_present), &done_element);
}
// i. Let kValue be Get(O, Pk).
// ii. ReturnIfAbrupt(kValue).
Node* k_value = GetProperty(context(), o(), k());
// iii. Let funcResult be Call(callbackfn, T, «kValue, k, O»).
// iv. ReturnIfAbrupt(funcResult).
a_.Bind(processor(this, k_value, k()));
Goto(&done_element);
BIND(&done_element);
if (direction == ForEachDirection::kForward) {
// e. Increase k by 1.
k_.Bind(NumberInc(k()));
} else {
// e. Decrease k by 1.
k_.Bind(NumberDec(k()));
}
Goto(&loop);
}
BIND(&after_loop);
action(this);
Return(a_.value());
}
private:
static ElementsKind ElementsKindForInstanceType(InstanceType type) {
switch (type) {
#define INSTANCE_TYPE_TO_ELEMENTS_KIND(Type, type, TYPE, ctype, size) \
case FIXED_##TYPE##_ARRAY_TYPE: \
return TYPE##_ELEMENTS;
TYPED_ARRAYS(INSTANCE_TYPE_TO_ELEMENTS_KIND)
#undef INSTANCE_TYPE_TO_ELEMENTS_KIND
default:
UNREACHABLE();
}
}
void VisitAllTypedArrayElements(Node* array_buffer,
const CallResultProcessor& processor,
Label* detached, ForEachDirection direction) {
VariableList list({&a_, &k_, &to_}, zone());
FastLoopBody body = [&](Node* index) {
GotoIf(IsDetachedBuffer(array_buffer), detached);
Node* elements = LoadElements(o_);
Node* base_ptr =
LoadObjectField(elements, FixedTypedArrayBase::kBasePointerOffset);
Node* external_ptr =
LoadObjectField(elements, FixedTypedArrayBase::kExternalPointerOffset,
MachineType::Pointer());
Node* data_ptr = IntPtrAdd(BitcastTaggedToWord(base_ptr), external_ptr);
Node* value = LoadFixedTypedArrayElementAsTagged(
data_ptr, index, source_elements_kind_, SMI_PARAMETERS);
k_.Bind(index);
a_.Bind(processor(this, value, index));
};
Node* start = SmiConstant(0);
Node* end = len_;
IndexAdvanceMode advance_mode = IndexAdvanceMode::kPost;
int incr = 1;
if (direction == ForEachDirection::kReverse) {
std::swap(start, end);
advance_mode = IndexAdvanceMode::kPre;
incr = -1;
}
BuildFastLoop(list, start, end, body, incr, ParameterMode::SMI_PARAMETERS,
advance_mode);
}
void VisitAllFastElementsOneKind(ElementsKind kind,
const CallResultProcessor& processor,
Label* array_changed, ParameterMode mode,
ForEachDirection direction,
MissingPropertyMode missing_property_mode) {
Comment("begin VisitAllFastElementsOneKind");
VARIABLE(original_map, MachineRepresentation::kTagged);
original_map.Bind(LoadMap(o()));
VariableList list({&original_map, &a_, &k_, &to_}, zone());
Node* start = IntPtrOrSmiConstant(0, mode);
Node* end = TaggedToParameter(len(), mode);
IndexAdvanceMode advance_mode = direction == ForEachDirection::kReverse
? IndexAdvanceMode::kPre
: IndexAdvanceMode::kPost;
if (direction == ForEachDirection::kReverse) std::swap(start, end);
BuildFastLoop(
list, start, end,
[=, &original_map](Node* index) {
k_.Bind(ParameterToTagged(index, mode));
Label one_element_done(this), hole_element(this),
process_element(this);
// Check if o's map has changed during the callback. If so, we have to
// fall back to the slower spec implementation for the rest of the
// iteration.
Node* o_map = LoadMap(o());
GotoIf(WordNotEqual(o_map, original_map.value()), array_changed);
// Check if o's length has changed during the callback and if the
// index is now out of range of the new length.
GotoIf(SmiGreaterThanOrEqual(k_.value(), LoadJSArrayLength(o())),
array_changed);
// Re-load the elements array. If may have been resized.
Node* elements = LoadElements(o());
// Fast case: load the element directly from the elements FixedArray
// and call the callback if the element is not the hole.
DCHECK(kind == PACKED_ELEMENTS || kind == PACKED_DOUBLE_ELEMENTS);
int base_size = kind == PACKED_ELEMENTS
? FixedArray::kHeaderSize
: (FixedArray::kHeaderSize - kHeapObjectTag);
Node* offset = ElementOffsetFromIndex(index, kind, mode, base_size);
VARIABLE(value, MachineRepresentation::kTagged);
if (kind == PACKED_ELEMENTS) {
value.Bind(LoadObjectField(elements, offset));
GotoIf(WordEqual(value.value(), TheHoleConstant()), &hole_element);
} else {
Node* double_value =
LoadDoubleWithHoleCheck(elements, offset, &hole_element);
value.Bind(AllocateHeapNumberWithValue(double_value));
}
Goto(&process_element);
BIND(&hole_element);
if (missing_property_mode == MissingPropertyMode::kSkip) {
// Check if o's prototype change unexpectedly has elements after
// the callback in the case of a hole.
BranchIfPrototypesHaveNoElements(o_map, &one_element_done,
array_changed);
} else {
value.Bind(UndefinedConstant());
Goto(&process_element);
}
BIND(&process_element);
{
a_.Bind(processor(this, value.value(), k()));
Goto(&one_element_done);
}
BIND(&one_element_done);
},
1, mode, advance_mode);
Comment("end VisitAllFastElementsOneKind");
}
void HandleFastElements(const CallResultProcessor& processor,
const PostLoopAction& action, Label* slow,
ForEachDirection direction,
MissingPropertyMode missing_property_mode) {
Label switch_on_elements_kind(this), fast_elements(this),
maybe_double_elements(this), fast_double_elements(this);
Comment("begin HandleFastElements");
// Non-smi lengths must use the slow path.
GotoIf(TaggedIsNotSmi(len()), slow);
BranchIfFastJSArray(o(), context(),
&switch_on_elements_kind, slow);
BIND(&switch_on_elements_kind);
// Select by ElementsKind
Node* o_map = LoadMap(o());
Node* bit_field2 = LoadMapBitField2(o_map);
Node* kind = DecodeWord32<Map::ElementsKindBits>(bit_field2);
Branch(IsElementsKindGreaterThan(kind, HOLEY_ELEMENTS),
&maybe_double_elements, &fast_elements);
ParameterMode mode = OptimalParameterMode();
BIND(&fast_elements);
{
VisitAllFastElementsOneKind(PACKED_ELEMENTS, processor, slow, mode,
direction, missing_property_mode);
action(this);
// No exception, return success
ReturnFromBuiltin(a_.value());
}
BIND(&maybe_double_elements);
Branch(IsElementsKindGreaterThan(kind, HOLEY_DOUBLE_ELEMENTS), slow,
&fast_double_elements);
BIND(&fast_double_elements);
{
VisitAllFastElementsOneKind(PACKED_DOUBLE_ELEMENTS, processor, slow, mode,
direction, missing_property_mode);
action(this);
// No exception, return success
ReturnFromBuiltin(a_.value());
}
}
// Perform ArraySpeciesCreate (ES6 #sec-arrayspeciescreate).
// This version is specialized to create a zero length array
// of the elements kind of the input array.
void ArraySpeciesCreate() {
Label runtime(this, Label::kDeferred), done(this);
TNode<Smi> len = SmiConstant(0);
TNode<Map> original_map = LoadMap(o());
GotoIfNot(
InstanceTypeEqual(LoadMapInstanceType(original_map), JS_ARRAY_TYPE),
&runtime);
GotoIfNot(IsPrototypeInitialArrayPrototype(context(), original_map),
&runtime);
Node* species_protector = SpeciesProtectorConstant();
Node* value =
LoadObjectField(species_protector, PropertyCell::kValueOffset);
TNode<Smi> const protector_invalid =
SmiConstant(Isolate::kProtectorInvalid);
GotoIf(WordEqual(value, protector_invalid), &runtime);
// Respect the ElementsKind of the input array.
TNode<Int32T> elements_kind = LoadMapElementsKind(original_map);
GotoIfNot(IsFastElementsKind(elements_kind), &runtime);
TNode<Context> native_context = CAST(LoadNativeContext(context()));
TNode<Map> array_map =
CAST(LoadJSArrayElementsMap(elements_kind, native_context));
TNode<JSArray> array =
CAST(AllocateJSArray(GetInitialFastElementsKind(), array_map, len, len,
nullptr, CodeStubAssembler::SMI_PARAMETERS));
a_.Bind(array);
Goto(&done);
BIND(&runtime);
{
// 5. Let A be ? ArraySpeciesCreate(O, len).
Node* constructor =
CallRuntime(Runtime::kArraySpeciesConstructor, context(), o());
a_.Bind(ConstructJS(CodeFactory::Construct(isolate()), context(),
constructor, len));
Goto(&fully_spec_compliant_);
}
BIND(&done);
}
// Perform ArraySpeciesCreate (ES6 #sec-arrayspeciescreate).
void ArraySpeciesCreate(SloppyTNode<Smi> len) {
Label runtime(this, Label::kDeferred), done(this);
Node* const original_map = LoadMap(o());
GotoIfNot(
InstanceTypeEqual(LoadMapInstanceType(original_map), JS_ARRAY_TYPE),
&runtime);
GotoIfNot(IsPrototypeInitialArrayPrototype(context(), original_map),
&runtime);
Node* species_protector = SpeciesProtectorConstant();
Node* value =
LoadObjectField(species_protector, PropertyCell::kValueOffset);
Node* const protector_invalid = SmiConstant(Isolate::kProtectorInvalid);
GotoIf(WordEqual(value, protector_invalid), &runtime);
GotoIfNot(TaggedIsPositiveSmi(len), &runtime);
GotoIf(SmiAbove(len, SmiConstant(JSArray::kInitialMaxFastElementArray)),
&runtime);
// We need to be conservative and start with holey because the builtins
// that create output arrays aren't guaranteed to be called for every
// element in the input array (maybe the callback deletes an element).
const ElementsKind elements_kind =
GetHoleyElementsKind(GetInitialFastElementsKind());
TNode<Context> native_context = CAST(LoadNativeContext(context()));
TNode<Map> array_map =
CAST(LoadJSArrayElementsMap(elements_kind, native_context));
a_.Bind(AllocateJSArray(PACKED_SMI_ELEMENTS, array_map, len, len, nullptr,
CodeStubAssembler::SMI_PARAMETERS));
Goto(&done);
BIND(&runtime);
{
// 5. Let A be ? ArraySpeciesCreate(O, len).
Node* constructor =
CallRuntime(Runtime::kArraySpeciesConstructor, context(), o());
a_.Bind(ConstructJS(CodeFactory::Construct(isolate()), context(),
constructor, len));
Goto(&fully_spec_compliant_);
}
BIND(&done);
}
Node* callbackfn_ = nullptr;
Node* o_ = nullptr;
Node* this_arg_ = nullptr;
Node* len_ = nullptr;
Node* context_ = nullptr;
Node* receiver_ = nullptr;
Node* new_target_ = nullptr;
Node* argc_ = nullptr;
Node* fast_typed_array_target_ = nullptr;
const char* name_ = nullptr;
Variable k_;
Variable a_;
Variable to_;
Label fully_spec_compliant_;
ElementsKind source_elements_kind_ = ElementsKind::NO_ELEMENTS;
};
TF_BUILTIN(ArrayPrototypePop, CodeStubAssembler) {
Node* argc = Parameter(BuiltinDescriptor::kArgumentsCount);
Node* context = Parameter(BuiltinDescriptor::kContext);
CSA_ASSERT(this, IsUndefined(Parameter(BuiltinDescriptor::kNewTarget)));
CodeStubArguments args(this, ChangeInt32ToIntPtr(argc));
Node* receiver = args.GetReceiver();
Label runtime(this, Label::kDeferred);
Label fast(this);
// Only pop in this stub if
// 1) the array has fast elements
// 2) the length is writable,
// 3) the elements backing store isn't copy-on-write,
// 4) we aren't supposed to shrink the backing store.
// 1) Check that the array has fast elements.
BranchIfFastJSArray(receiver, context, &fast, &runtime);
BIND(&fast);
{
CSA_ASSERT(this, TaggedIsPositiveSmi(LoadJSArrayLength(receiver)));
Node* length = LoadAndUntagObjectField(receiver, JSArray::kLengthOffset);
Label return_undefined(this), fast_elements(this);
GotoIf(IntPtrEqual(length, IntPtrConstant(0)), &return_undefined);
// 2) Ensure that the length is writable.
EnsureArrayLengthWritable(LoadMap(receiver), &runtime);
// 3) Check that the elements backing store isn't copy-on-write.
Node* elements = LoadElements(receiver);
GotoIf(WordEqual(LoadMap(elements),
LoadRoot(Heap::kFixedCOWArrayMapRootIndex)),
&runtime);
Node* new_length = IntPtrSub(length, IntPtrConstant(1));
// 4) Check that we're not supposed to shrink the backing store, as
// implemented in elements.cc:ElementsAccessorBase::SetLengthImpl.
Node* capacity = SmiUntag(LoadFixedArrayBaseLength(elements));
GotoIf(IntPtrLessThan(
IntPtrAdd(IntPtrAdd(new_length, new_length),
IntPtrConstant(JSObject::kMinAddedElementsCapacity)),
capacity),
&runtime);
StoreObjectFieldNoWriteBarrier(receiver, JSArray::kLengthOffset,
SmiTag(new_length));
Node* elements_kind = LoadMapElementsKind(LoadMap(receiver));
GotoIf(Int32LessThanOrEqual(elements_kind,
Int32Constant(TERMINAL_FAST_ELEMENTS_KIND)),
&fast_elements);
Node* value = LoadFixedDoubleArrayElement(
elements, new_length, MachineType::Float64(), 0, INTPTR_PARAMETERS,
&return_undefined);
int32_t header_size = FixedDoubleArray::kHeaderSize - kHeapObjectTag;
Node* offset = ElementOffsetFromIndex(new_length, HOLEY_DOUBLE_ELEMENTS,
INTPTR_PARAMETERS, header_size);
if (Is64()) {
Node* double_hole = Int64Constant(kHoleNanInt64);
StoreNoWriteBarrier(MachineRepresentation::kWord64, elements, offset,
double_hole);
} else {
STATIC_ASSERT(kHoleNanLower32 == kHoleNanUpper32);
Node* double_hole = Int32Constant(kHoleNanLower32);
StoreNoWriteBarrier(MachineRepresentation::kWord32, elements, offset,
double_hole);
StoreNoWriteBarrier(MachineRepresentation::kWord32, elements,
IntPtrAdd(offset, IntPtrConstant(kPointerSize)),
double_hole);
}
args.PopAndReturn(AllocateHeapNumberWithValue(value));
BIND(&fast_elements);
{
Node* value = LoadFixedArrayElement(elements, new_length);
StoreFixedArrayElement(elements, new_length, TheHoleConstant());
GotoIf(WordEqual(value, TheHoleConstant()), &return_undefined);
args.PopAndReturn(value);
}
BIND(&return_undefined);
{ args.PopAndReturn(UndefinedConstant()); }
}
BIND(&runtime);
{
Node* target = LoadFromFrame(StandardFrameConstants::kFunctionOffset,
MachineType::TaggedPointer());
TailCallStub(CodeFactory::ArrayPop(isolate()), context, target,
UndefinedConstant(), argc);
}
}
TF_BUILTIN(ArrayPrototypePush, CodeStubAssembler) {
TVARIABLE(IntPtrT, arg_index);