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|
// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/compiler/js-create-lowering.h"
#include "src/code-factory.h"
#include "src/compiler/access-builder.h"
#include "src/compiler/allocation-builder.h"
#include "src/compiler/common-operator.h"
#include "src/compiler/compilation-dependencies.h"
#include "src/compiler/js-graph.h"
#include "src/compiler/js-operator.h"
#include "src/compiler/linkage.h"
#include "src/compiler/node-matchers.h"
#include "src/compiler/node-properties.h"
#include "src/compiler/node.h"
#include "src/compiler/operator-properties.h"
#include "src/compiler/simplified-operator.h"
#include "src/compiler/state-values-utils.h"
#include "src/objects-inl.h"
#include "src/objects/arguments.h"
#include "src/objects/hash-table-inl.h"
#include "src/objects/js-promise.h"
#include "src/objects/js-regexp-inl.h"
namespace v8 {
namespace internal {
namespace compiler {
namespace {
// Retrieves the frame state holding actual argument values.
Node* GetArgumentsFrameState(Node* frame_state) {
Node* const outer_state = NodeProperties::GetFrameStateInput(frame_state);
FrameStateInfo outer_state_info = FrameStateInfoOf(outer_state->op());
return outer_state_info.type() == FrameStateType::kArgumentsAdaptor
? outer_state
: frame_state;
}
// Checks whether allocation using the given target and new.target can be
// inlined.
bool IsAllocationInlineable(const JSFunctionRef& target,
const JSFunctionRef& new_target) {
return new_target.has_initial_map() &&
!new_target.initial_map().is_dictionary_map() &&
new_target.initial_map().constructor_or_backpointer().equals(target);
}
// When initializing arrays, we'll unfold the loop if the number of
// elements is known to be of this type.
const int kElementLoopUnrollLimit = 16;
// Limits up to which context allocations are inlined.
const int kFunctionContextAllocationLimit = 16;
const int kBlockContextAllocationLimit = 16;
} // namespace
Reduction JSCreateLowering::Reduce(Node* node) {
switch (node->opcode()) {
case IrOpcode::kJSCreate:
return ReduceJSCreate(node);
case IrOpcode::kJSCreateArguments:
return ReduceJSCreateArguments(node);
case IrOpcode::kJSCreateArray:
return ReduceJSCreateArray(node);
case IrOpcode::kJSCreateArrayIterator:
return ReduceJSCreateArrayIterator(node);
case IrOpcode::kJSCreateBoundFunction:
return ReduceJSCreateBoundFunction(node);
case IrOpcode::kJSCreateClosure:
return ReduceJSCreateClosure(node);
case IrOpcode::kJSCreateCollectionIterator:
return ReduceJSCreateCollectionIterator(node);
case IrOpcode::kJSCreateIterResultObject:
return ReduceJSCreateIterResultObject(node);
case IrOpcode::kJSCreateStringIterator:
return ReduceJSCreateStringIterator(node);
case IrOpcode::kJSCreateKeyValueArray:
return ReduceJSCreateKeyValueArray(node);
case IrOpcode::kJSCreatePromise:
return ReduceJSCreatePromise(node);
case IrOpcode::kJSCreateLiteralArray:
case IrOpcode::kJSCreateLiteralObject:
return ReduceJSCreateLiteralArrayOrObject(node);
case IrOpcode::kJSCreateLiteralRegExp:
return ReduceJSCreateLiteralRegExp(node);
case IrOpcode::kJSCreateEmptyLiteralArray:
return ReduceJSCreateEmptyLiteralArray(node);
case IrOpcode::kJSCreateEmptyLiteralObject:
return ReduceJSCreateEmptyLiteralObject(node);
case IrOpcode::kJSCreateFunctionContext:
return ReduceJSCreateFunctionContext(node);
case IrOpcode::kJSCreateWithContext:
return ReduceJSCreateWithContext(node);
case IrOpcode::kJSCreateCatchContext:
return ReduceJSCreateCatchContext(node);
case IrOpcode::kJSCreateBlockContext:
return ReduceJSCreateBlockContext(node);
case IrOpcode::kJSCreateGeneratorObject:
return ReduceJSCreateGeneratorObject(node);
case IrOpcode::kJSCreateObject:
return ReduceJSCreateObject(node);
default:
break;
}
return NoChange();
}
Reduction JSCreateLowering::ReduceJSCreate(Node* node) {
DisallowHeapAccess no_heap_access;
DCHECK_EQ(IrOpcode::kJSCreate, node->opcode());
Node* const target = NodeProperties::GetValueInput(node, 0);
Type const target_type = NodeProperties::GetType(target);
Node* const new_target = NodeProperties::GetValueInput(node, 1);
Type const new_target_type = NodeProperties::GetType(new_target);
Node* const effect = NodeProperties::GetEffectInput(node);
Node* const control = NodeProperties::GetControlInput(node);
// Extract constructor and original constructor function.
if (!target_type.IsHeapConstant() || !new_target_type.IsHeapConstant() ||
!target_type.AsHeapConstant()->Ref().IsJSFunction() ||
!new_target_type.AsHeapConstant()->Ref().IsJSFunction()) {
return NoChange();
}
JSFunctionRef constructor =
target_type.AsHeapConstant()->Ref().AsJSFunction();
if (!constructor.IsConstructor()) return NoChange();
JSFunctionRef original_constructor =
new_target_type.AsHeapConstant()->Ref().AsJSFunction();
if (!original_constructor.IsConstructor()) return NoChange();
// Check if we can inline the allocation.
if (!IsAllocationInlineable(constructor, original_constructor)) {
return NoChange();
}
// Add a dependency on the {initial_map} to make sure that this code is
// deoptimized whenever the {initial_map} changes.
MapRef initial_map = dependencies()->DependOnInitialMap(original_constructor);
// Force completion of inobject slack tracking before
// generating code to finalize the instance size.
SlackTrackingResult slack_tracking_result =
original_constructor.FinishSlackTracking();
// Emit code to allocate the JSObject instance for the
// {original_constructor}.
AllocationBuilder a(jsgraph(), effect, control);
a.Allocate(slack_tracking_result.instance_size);
a.Store(AccessBuilder::ForMap(), initial_map);
a.Store(AccessBuilder::ForJSObjectPropertiesOrHash(),
jsgraph()->EmptyFixedArrayConstant());
a.Store(AccessBuilder::ForJSObjectElements(),
jsgraph()->EmptyFixedArrayConstant());
for (int i = 0; i < slack_tracking_result.inobject_property_count; ++i) {
a.Store(AccessBuilder::ForJSObjectInObjectProperty(initial_map, i),
jsgraph()->UndefinedConstant());
}
RelaxControls(node);
a.FinishAndChange(node);
return Changed(node);
}
Reduction JSCreateLowering::ReduceJSCreateArguments(Node* node) {
DisallowHeapAccess no_heap_access;
DCHECK_EQ(IrOpcode::kJSCreateArguments, node->opcode());
CreateArgumentsType type = CreateArgumentsTypeOf(node->op());
Node* const frame_state = NodeProperties::GetFrameStateInput(node);
Node* const outer_state = frame_state->InputAt(kFrameStateOuterStateInput);
Node* const control = graph()->start();
FrameStateInfo state_info = FrameStateInfoOf(frame_state->op());
SharedFunctionInfoRef shared(js_heap_broker(),
state_info.shared_info().ToHandleChecked());
// Use the ArgumentsAccessStub for materializing both mapped and unmapped
// arguments object, but only for non-inlined (i.e. outermost) frames.
if (outer_state->opcode() != IrOpcode::kFrameState) {
switch (type) {
case CreateArgumentsType::kMappedArguments: {
// TODO(mstarzinger): Duplicate parameters are not handled yet.
if (shared.has_duplicate_parameters()) return NoChange();
Node* const callee = NodeProperties::GetValueInput(node, 0);
Node* const context = NodeProperties::GetContextInput(node);
Node* effect = NodeProperties::GetEffectInput(node);
Node* const arguments_frame =
graph()->NewNode(simplified()->ArgumentsFrame());
Node* const arguments_length = graph()->NewNode(
simplified()->ArgumentsLength(
shared.internal_formal_parameter_count(), false),
arguments_frame);
// Allocate the elements backing store.
bool has_aliased_arguments = false;
Node* const elements = effect = AllocateAliasedArguments(
effect, control, context, arguments_frame, arguments_length, shared,
&has_aliased_arguments);
// Load the arguments object map.
Node* const arguments_map = jsgraph()->Constant(
has_aliased_arguments
? native_context_ref().fast_aliased_arguments_map()
: native_context_ref().sloppy_arguments_map());
// Actually allocate and initialize the arguments object.
AllocationBuilder a(jsgraph(), effect, control);
Node* properties = jsgraph()->EmptyFixedArrayConstant();
STATIC_ASSERT(JSSloppyArgumentsObject::kSize == 5 * kPointerSize);
a.Allocate(JSSloppyArgumentsObject::kSize);
a.Store(AccessBuilder::ForMap(), arguments_map);
a.Store(AccessBuilder::ForJSObjectPropertiesOrHash(), properties);
a.Store(AccessBuilder::ForJSObjectElements(), elements);
a.Store(AccessBuilder::ForArgumentsLength(), arguments_length);
a.Store(AccessBuilder::ForArgumentsCallee(), callee);
RelaxControls(node);
a.FinishAndChange(node);
return Changed(node);
}
case CreateArgumentsType::kUnmappedArguments: {
Node* effect = NodeProperties::GetEffectInput(node);
Node* const arguments_frame =
graph()->NewNode(simplified()->ArgumentsFrame());
Node* const arguments_length = graph()->NewNode(
simplified()->ArgumentsLength(
shared.internal_formal_parameter_count(), false),
arguments_frame);
// Allocate the elements backing store.
Node* const elements = effect =
graph()->NewNode(simplified()->NewArgumentsElements(0),
arguments_frame, arguments_length, effect);
// Load the arguments object map.
Node* const arguments_map =
jsgraph()->Constant(native_context_ref().strict_arguments_map());
// Actually allocate and initialize the arguments object.
AllocationBuilder a(jsgraph(), effect, control);
Node* properties = jsgraph()->EmptyFixedArrayConstant();
STATIC_ASSERT(JSStrictArgumentsObject::kSize == 4 * kPointerSize);
a.Allocate(JSStrictArgumentsObject::kSize);
a.Store(AccessBuilder::ForMap(), arguments_map);
a.Store(AccessBuilder::ForJSObjectPropertiesOrHash(), properties);
a.Store(AccessBuilder::ForJSObjectElements(), elements);
a.Store(AccessBuilder::ForArgumentsLength(), arguments_length);
RelaxControls(node);
a.FinishAndChange(node);
return Changed(node);
}
case CreateArgumentsType::kRestParameter: {
Node* effect = NodeProperties::GetEffectInput(node);
Node* const arguments_frame =
graph()->NewNode(simplified()->ArgumentsFrame());
Node* const rest_length = graph()->NewNode(
simplified()->ArgumentsLength(
shared.internal_formal_parameter_count(), true),
arguments_frame);
// Allocate the elements backing store. Since NewArgumentsElements
// copies from the end of the arguments adapter frame, this is a suffix
// of the actual arguments.
Node* const elements = effect =
graph()->NewNode(simplified()->NewArgumentsElements(0),
arguments_frame, rest_length, effect);
// Load the JSArray object map.
Node* const jsarray_map = jsgraph()->Constant(
native_context_ref().js_array_fast_elements_map_index());
// Actually allocate and initialize the jsarray.
AllocationBuilder a(jsgraph(), effect, control);
Node* properties = jsgraph()->EmptyFixedArrayConstant();
STATIC_ASSERT(JSArray::kSize == 4 * kPointerSize);
a.Allocate(JSArray::kSize);
a.Store(AccessBuilder::ForMap(), jsarray_map);
a.Store(AccessBuilder::ForJSObjectPropertiesOrHash(), properties);
a.Store(AccessBuilder::ForJSObjectElements(), elements);
a.Store(AccessBuilder::ForJSArrayLength(PACKED_ELEMENTS), rest_length);
RelaxControls(node);
a.FinishAndChange(node);
return Changed(node);
}
}
UNREACHABLE();
} else if (outer_state->opcode() == IrOpcode::kFrameState) {
// Use inline allocation for all mapped arguments objects within inlined
// (i.e. non-outermost) frames, independent of the object size.
if (type == CreateArgumentsType::kMappedArguments) {
Node* const callee = NodeProperties::GetValueInput(node, 0);
Node* const context = NodeProperties::GetContextInput(node);
Node* effect = NodeProperties::GetEffectInput(node);
// TODO(mstarzinger): Duplicate parameters are not handled yet.
if (shared.has_duplicate_parameters()) return NoChange();
// Choose the correct frame state and frame state info depending on
// whether there conceptually is an arguments adaptor frame in the call
// chain.
Node* const args_state = GetArgumentsFrameState(frame_state);
if (args_state->InputAt(kFrameStateParametersInput)->opcode() ==
IrOpcode::kDeadValue) {
// This protects against an incompletely propagated DeadValue node.
// If the FrameState has a DeadValue input, then this node will be
// pruned anyway.
return NoChange();
}
FrameStateInfo args_state_info = FrameStateInfoOf(args_state->op());
// Prepare element backing store to be used by arguments object.
bool has_aliased_arguments = false;
Node* const elements = AllocateAliasedArguments(
effect, control, args_state, context, shared, &has_aliased_arguments);
effect = elements->op()->EffectOutputCount() > 0 ? elements : effect;
// Load the arguments object map.
Node* const arguments_map = jsgraph()->Constant(
has_aliased_arguments
? native_context_ref().fast_aliased_arguments_map()
: native_context_ref().sloppy_arguments_map());
// Actually allocate and initialize the arguments object.
AllocationBuilder a(jsgraph(), effect, control);
Node* properties = jsgraph()->EmptyFixedArrayConstant();
int length = args_state_info.parameter_count() - 1; // Minus receiver.
STATIC_ASSERT(JSSloppyArgumentsObject::kSize == 5 * kPointerSize);
a.Allocate(JSSloppyArgumentsObject::kSize);
a.Store(AccessBuilder::ForMap(), arguments_map);
a.Store(AccessBuilder::ForJSObjectPropertiesOrHash(), properties);
a.Store(AccessBuilder::ForJSObjectElements(), elements);
a.Store(AccessBuilder::ForArgumentsLength(), jsgraph()->Constant(length));
a.Store(AccessBuilder::ForArgumentsCallee(), callee);
RelaxControls(node);
a.FinishAndChange(node);
return Changed(node);
} else if (type == CreateArgumentsType::kUnmappedArguments) {
// Use inline allocation for all unmapped arguments objects within inlined
// (i.e. non-outermost) frames, independent of the object size.
Node* effect = NodeProperties::GetEffectInput(node);
// Choose the correct frame state and frame state info depending on
// whether there conceptually is an arguments adaptor frame in the call
// chain.
Node* const args_state = GetArgumentsFrameState(frame_state);
if (args_state->InputAt(kFrameStateParametersInput)->opcode() ==
IrOpcode::kDeadValue) {
// This protects against an incompletely propagated DeadValue node.
// If the FrameState has a DeadValue input, then this node will be
// pruned anyway.
return NoChange();
}
FrameStateInfo args_state_info = FrameStateInfoOf(args_state->op());
// Prepare element backing store to be used by arguments object.
Node* const elements = AllocateArguments(effect, control, args_state);
effect = elements->op()->EffectOutputCount() > 0 ? elements : effect;
// Load the arguments object map.
Node* const arguments_map =
jsgraph()->Constant(native_context_ref().strict_arguments_map());
// Actually allocate and initialize the arguments object.
AllocationBuilder a(jsgraph(), effect, control);
Node* properties = jsgraph()->EmptyFixedArrayConstant();
int length = args_state_info.parameter_count() - 1; // Minus receiver.
STATIC_ASSERT(JSStrictArgumentsObject::kSize == 4 * kPointerSize);
a.Allocate(JSStrictArgumentsObject::kSize);
a.Store(AccessBuilder::ForMap(), arguments_map);
a.Store(AccessBuilder::ForJSObjectPropertiesOrHash(), properties);
a.Store(AccessBuilder::ForJSObjectElements(), elements);
a.Store(AccessBuilder::ForArgumentsLength(), jsgraph()->Constant(length));
RelaxControls(node);
a.FinishAndChange(node);
return Changed(node);
} else if (type == CreateArgumentsType::kRestParameter) {
int start_index = shared.internal_formal_parameter_count();
// Use inline allocation for all unmapped arguments objects within inlined
// (i.e. non-outermost) frames, independent of the object size.
Node* effect = NodeProperties::GetEffectInput(node);
// Choose the correct frame state and frame state info depending on
// whether there conceptually is an arguments adaptor frame in the call
// chain.
Node* const args_state = GetArgumentsFrameState(frame_state);
if (args_state->InputAt(kFrameStateParametersInput)->opcode() ==
IrOpcode::kDeadValue) {
// This protects against an incompletely propagated DeadValue node.
// If the FrameState has a DeadValue input, then this node will be
// pruned anyway.
return NoChange();
}
FrameStateInfo args_state_info = FrameStateInfoOf(args_state->op());
// Prepare element backing store to be used by the rest array.
Node* const elements =
AllocateRestArguments(effect, control, args_state, start_index);
effect = elements->op()->EffectOutputCount() > 0 ? elements : effect;
// Load the JSArray object map.
Node* const jsarray_map = jsgraph()->Constant(
native_context_ref().js_array_fast_elements_map_index());
// Actually allocate and initialize the jsarray.
AllocationBuilder a(jsgraph(), effect, control);
Node* properties = jsgraph()->EmptyFixedArrayConstant();
// -1 to minus receiver
int argument_count = args_state_info.parameter_count() - 1;
int length = std::max(0, argument_count - start_index);
STATIC_ASSERT(JSArray::kSize == 4 * kPointerSize);
a.Allocate(JSArray::kSize);
a.Store(AccessBuilder::ForMap(), jsarray_map);
a.Store(AccessBuilder::ForJSObjectPropertiesOrHash(), properties);
a.Store(AccessBuilder::ForJSObjectElements(), elements);
a.Store(AccessBuilder::ForJSArrayLength(PACKED_ELEMENTS),
jsgraph()->Constant(length));
RelaxControls(node);
a.FinishAndChange(node);
return Changed(node);
}
}
return NoChange();
}
Reduction JSCreateLowering::ReduceJSCreateGeneratorObject(Node* node) {
DisallowHeapAccess no_heap_access;
DCHECK_EQ(IrOpcode::kJSCreateGeneratorObject, node->opcode());
Node* const closure = NodeProperties::GetValueInput(node, 0);
Node* const receiver = NodeProperties::GetValueInput(node, 1);
Node* const context = NodeProperties::GetContextInput(node);
Type const closure_type = NodeProperties::GetType(closure);
Node* effect = NodeProperties::GetEffectInput(node);
Node* const control = NodeProperties::GetControlInput(node);
if (closure_type.IsHeapConstant()) {
DCHECK(closure_type.AsHeapConstant()->Ref().IsJSFunction());
JSFunctionRef js_function =
closure_type.AsHeapConstant()->Ref().AsJSFunction();
js_function.EnsureHasInitialMap();
// Force completion of inobject slack tracking before
// generating code to finalize the instance size.
SlackTrackingResult slack_tracking_result =
js_function.FinishSlackTracking();
// Add a dependency on the {initial_map} to make sure that this code is
// deoptimized whenever the {initial_map} changes.
MapRef initial_map = dependencies()->DependOnInitialMap(js_function);
DCHECK(initial_map.instance_type() == JS_GENERATOR_OBJECT_TYPE ||
initial_map.instance_type() == JS_ASYNC_GENERATOR_OBJECT_TYPE);
// Allocate a register file.
SharedFunctionInfoRef shared = js_function.shared();
DCHECK(shared.HasBytecodeArray());
int parameter_count_no_receiver = shared.internal_formal_parameter_count();
int size =
parameter_count_no_receiver + shared.GetBytecodeArrayRegisterCount();
AllocationBuilder ab(jsgraph(), effect, control);
ab.AllocateArray(size, factory()->fixed_array_map());
for (int i = 0; i < size; ++i) {
ab.Store(AccessBuilder::ForFixedArraySlot(i),
jsgraph()->UndefinedConstant());
}
Node* parameters_and_registers = effect = ab.Finish();
// Emit code to allocate the JS[Async]GeneratorObject instance.
AllocationBuilder a(jsgraph(), effect, control);
a.Allocate(slack_tracking_result.instance_size);
Node* empty_fixed_array = jsgraph()->EmptyFixedArrayConstant();
Node* undefined = jsgraph()->UndefinedConstant();
a.Store(AccessBuilder::ForMap(), initial_map);
a.Store(AccessBuilder::ForJSObjectPropertiesOrHash(), empty_fixed_array);
a.Store(AccessBuilder::ForJSObjectElements(), empty_fixed_array);
a.Store(AccessBuilder::ForJSGeneratorObjectContext(), context);
a.Store(AccessBuilder::ForJSGeneratorObjectFunction(), closure);
a.Store(AccessBuilder::ForJSGeneratorObjectReceiver(), receiver);
a.Store(AccessBuilder::ForJSGeneratorObjectInputOrDebugPos(), undefined);
a.Store(AccessBuilder::ForJSGeneratorObjectResumeMode(),
jsgraph()->Constant(JSGeneratorObject::kNext));
a.Store(AccessBuilder::ForJSGeneratorObjectContinuation(),
jsgraph()->Constant(JSGeneratorObject::kGeneratorExecuting));
a.Store(AccessBuilder::ForJSGeneratorObjectParametersAndRegisters(),
parameters_and_registers);
if (initial_map.instance_type() == JS_ASYNC_GENERATOR_OBJECT_TYPE) {
a.Store(AccessBuilder::ForJSAsyncGeneratorObjectQueue(), undefined);
a.Store(AccessBuilder::ForJSAsyncGeneratorObjectIsAwaiting(),
jsgraph()->ZeroConstant());
}
// Handle in-object properties, too.
for (int i = 0; i < slack_tracking_result.inobject_property_count; ++i) {
a.Store(AccessBuilder::ForJSObjectInObjectProperty(initial_map, i),
undefined);
}
a.FinishAndChange(node);
return Changed(node);
}
return NoChange();
}
// Constructs an array with a variable {length} when no upper bound
// is known for the capacity.
Reduction JSCreateLowering::ReduceNewArray(Node* node, Node* length,
Handle<Map> initial_map,
PretenureFlag pretenure) {
DCHECK_EQ(IrOpcode::kJSCreateArray, node->opcode());
Node* effect = NodeProperties::GetEffectInput(node);
Node* control = NodeProperties::GetControlInput(node);
// Constructing an Array via new Array(N) where N is an unsigned
// integer, always creates a holey backing store.
if (!IsHoleyElementsKind(initial_map->elements_kind())) {
initial_map =
Map::AsElementsKind(isolate(), initial_map,
GetHoleyElementsKind(initial_map->elements_kind()));
}
// Check that the {limit} is an unsigned integer in the valid range.
// This has to be kept in sync with src/runtime/runtime-array.cc,
// where this limit is protected.
length = effect = graph()->NewNode(
simplified()->CheckBounds(VectorSlotPair()), length,
jsgraph()->Constant(JSArray::kInitialMaxFastElementArray), effect,
control);
// Construct elements and properties for the resulting JSArray.
Node* elements = effect =
graph()->NewNode(IsDoubleElementsKind(initial_map->elements_kind())
? simplified()->NewDoubleElements(pretenure)
: simplified()->NewSmiOrObjectElements(pretenure),
length, effect, control);
Node* properties = jsgraph()->EmptyFixedArrayConstant();
// Perform the allocation of the actual JSArray object.
AllocationBuilder a(jsgraph(), effect, control);
a.Allocate(initial_map->instance_size(), pretenure);
a.Store(AccessBuilder::ForMap(), initial_map);
a.Store(AccessBuilder::ForJSObjectPropertiesOrHash(), properties);
a.Store(AccessBuilder::ForJSObjectElements(), elements);
a.Store(AccessBuilder::ForJSArrayLength(initial_map->elements_kind()),
length);
for (int i = 0; i < initial_map->GetInObjectProperties(); ++i) {
a.Store(AccessBuilder::ForJSObjectInObjectProperty(
MapRef(js_heap_broker(), initial_map), i),
jsgraph()->UndefinedConstant());
}
RelaxControls(node);
a.FinishAndChange(node);
return Changed(node);
}
// Constructs an array with a variable {length} when an actual
// upper bound is known for the {capacity}.
Reduction JSCreateLowering::ReduceNewArray(Node* node, Node* length,
int capacity,
Handle<Map> initial_map,
PretenureFlag pretenure) {
DCHECK(node->opcode() == IrOpcode::kJSCreateArray ||
node->opcode() == IrOpcode::kJSCreateEmptyLiteralArray);
Node* effect = NodeProperties::GetEffectInput(node);
Node* control = NodeProperties::GetControlInput(node);
// Determine the appropriate elements kind.
ElementsKind elements_kind = initial_map->elements_kind();
if (NodeProperties::GetType(length).Max() > 0.0) {
elements_kind = GetHoleyElementsKind(elements_kind);
initial_map = Map::AsElementsKind(isolate(), initial_map, elements_kind);
}
DCHECK(IsFastElementsKind(elements_kind));
// Setup elements and properties.
Node* elements;
if (capacity == 0) {
elements = jsgraph()->EmptyFixedArrayConstant();
} else {
elements = effect =
AllocateElements(effect, control, elements_kind, capacity, pretenure);
}
Node* properties = jsgraph()->EmptyFixedArrayConstant();
// Perform the allocation of the actual JSArray object.
AllocationBuilder a(jsgraph(), effect, control);
a.Allocate(initial_map->instance_size(), pretenure);
a.Store(AccessBuilder::ForMap(), initial_map);
a.Store(AccessBuilder::ForJSObjectPropertiesOrHash(), properties);
a.Store(AccessBuilder::ForJSObjectElements(), elements);
a.Store(AccessBuilder::ForJSArrayLength(elements_kind), length);
for (int i = 0; i < initial_map->GetInObjectProperties(); ++i) {
a.Store(AccessBuilder::ForJSObjectInObjectProperty(
MapRef(js_heap_broker(), initial_map), i),
jsgraph()->UndefinedConstant());
}
RelaxControls(node);
a.FinishAndChange(node);
return Changed(node);
}
Reduction JSCreateLowering::ReduceNewArray(Node* node,
std::vector<Node*> values,
Handle<Map> initial_map,
PretenureFlag pretenure) {
DCHECK_EQ(IrOpcode::kJSCreateArray, node->opcode());
Node* effect = NodeProperties::GetEffectInput(node);
Node* control = NodeProperties::GetControlInput(node);
// Determine the appropriate elements kind.
ElementsKind elements_kind = initial_map->elements_kind();
DCHECK(IsFastElementsKind(elements_kind));
// Check {values} based on the {elements_kind}. These checks are guarded
// by the {elements_kind} feedback on the {site}, so it's safe to just
// deoptimize in this case.
if (IsSmiElementsKind(elements_kind)) {
for (auto& value : values) {
if (!NodeProperties::GetType(value).Is(Type::SignedSmall())) {
value = effect = graph()->NewNode(
simplified()->CheckSmi(VectorSlotPair()), value, effect, control);
}
}
} else if (IsDoubleElementsKind(elements_kind)) {
for (auto& value : values) {
if (!NodeProperties::GetType(value).Is(Type::Number())) {
value = effect =
graph()->NewNode(simplified()->CheckNumber(VectorSlotPair()), value,
effect, control);
}
// Make sure we do not store signaling NaNs into double arrays.
value = graph()->NewNode(simplified()->NumberSilenceNaN(), value);
}
}
// Setup elements, properties and length.
Node* elements = effect =
AllocateElements(effect, control, elements_kind, values, pretenure);
Node* properties = jsgraph()->EmptyFixedArrayConstant();
Node* length = jsgraph()->Constant(static_cast<int>(values.size()));
// Perform the allocation of the actual JSArray object.
AllocationBuilder a(jsgraph(), effect, control);
a.Allocate(initial_map->instance_size(), pretenure);
a.Store(AccessBuilder::ForMap(), initial_map);
a.Store(AccessBuilder::ForJSObjectPropertiesOrHash(), properties);
a.Store(AccessBuilder::ForJSObjectElements(), elements);
a.Store(AccessBuilder::ForJSArrayLength(elements_kind), length);
for (int i = 0; i < initial_map->GetInObjectProperties(); ++i) {
a.Store(AccessBuilder::ForJSObjectInObjectProperty(
MapRef(js_heap_broker(), initial_map), i),
jsgraph()->UndefinedConstant());
}
RelaxControls(node);
a.FinishAndChange(node);
return Changed(node);
}
Reduction JSCreateLowering::ReduceNewArrayToStubCall(
Node* node, Handle<AllocationSite> site) {
CreateArrayParameters const& p = CreateArrayParametersOf(node->op());
int const arity = static_cast<int>(p.arity());
Node* target = NodeProperties::GetValueInput(node, 0);
Node* new_target = NodeProperties::GetValueInput(node, 1);
Type new_target_type = NodeProperties::GetType(new_target);
Node* type_info = site.is_null() ? jsgraph()->UndefinedConstant()
: jsgraph()->HeapConstant(site);
ElementsKind elements_kind =
site.is_null() ? GetInitialFastElementsKind() : site->GetElementsKind();
AllocationSiteOverrideMode override_mode =
(site.is_null() || AllocationSite::ShouldTrack(elements_kind))
? DISABLE_ALLOCATION_SITES
: DONT_OVERRIDE;
// The Array constructor can only trigger an observable side-effect
// if the new.target may be a proxy.
Operator::Properties const properties =
(new_target != target || new_target_type.Maybe(Type::Proxy()))
? Operator::kNoDeopt
: Operator::kNoDeopt | Operator::kNoWrite;
if (arity == 0) {
Callable callable = CodeFactory::ArrayNoArgumentConstructor(
isolate(), elements_kind, override_mode);
auto call_descriptor = Linkage::GetStubCallDescriptor(
graph()->zone(), callable.descriptor(), arity + 1,
CallDescriptor::kNeedsFrameState, properties);
node->ReplaceInput(0, jsgraph()->HeapConstant(callable.code()));
node->InsertInput(graph()->zone(), 2, type_info);
node->InsertInput(graph()->zone(), 3, jsgraph()->Constant(arity));
node->InsertInput(graph()->zone(), 4, jsgraph()->UndefinedConstant());
NodeProperties::ChangeOp(node, common()->Call(call_descriptor));
} else if (arity == 1) {
// Require elements kind to "go holey".
Callable callable = CodeFactory::ArraySingleArgumentConstructor(
isolate(), GetHoleyElementsKind(elements_kind), override_mode);
auto call_descriptor = Linkage::GetStubCallDescriptor(
graph()->zone(), callable.descriptor(), arity + 1,
CallDescriptor::kNeedsFrameState, properties);
node->ReplaceInput(0, jsgraph()->HeapConstant(callable.code()));
node->InsertInput(graph()->zone(), 2, type_info);
node->InsertInput(graph()->zone(), 3, jsgraph()->Constant(arity));
node->InsertInput(graph()->zone(), 4, jsgraph()->UndefinedConstant());
NodeProperties::ChangeOp(node, common()->Call(call_descriptor));
} else {
DCHECK_GT(arity, 1);
Handle<Code> code = BUILTIN_CODE(isolate(), ArrayNArgumentsConstructor);
auto call_descriptor = Linkage::GetStubCallDescriptor(
graph()->zone(), ArrayNArgumentsConstructorDescriptor{}, arity + 1,
CallDescriptor::kNeedsFrameState);
node->ReplaceInput(0, jsgraph()->HeapConstant(code));
node->InsertInput(graph()->zone(), 2, type_info);
node->InsertInput(graph()->zone(), 3, jsgraph()->Constant(arity));
node->InsertInput(graph()->zone(), 4, jsgraph()->UndefinedConstant());
NodeProperties::ChangeOp(node, common()->Call(call_descriptor));
}
return Changed(node);
}
Reduction JSCreateLowering::ReduceJSCreateArray(Node* node) {
DCHECK_EQ(IrOpcode::kJSCreateArray, node->opcode());
CreateArrayParameters const& p = CreateArrayParametersOf(node->op());
int const arity = static_cast<int>(p.arity());
Handle<AllocationSite> const site = p.site();
PretenureFlag pretenure = NOT_TENURED;
Handle<JSFunction> constructor(native_context()->array_function(), isolate());
Node* target = NodeProperties::GetValueInput(node, 0);
Node* new_target = NodeProperties::GetValueInput(node, 1);
Type new_target_type =
(target == new_target)
? Type::HeapConstant(js_heap_broker(), constructor, zone())
: NodeProperties::GetType(new_target);
// Extract original constructor function.
if (new_target_type.IsHeapConstant() &&
new_target_type.AsHeapConstant()->Value()->IsJSFunction()) {
Handle<JSFunction> original_constructor =
Handle<JSFunction>::cast(new_target_type.AsHeapConstant()->Value());
DCHECK(constructor->IsConstructor());
DCHECK(original_constructor->IsConstructor());
// Check if we can inline the allocation.
if (IsAllocationInlineable(
JSFunctionRef(js_heap_broker(), constructor),
JSFunctionRef(js_heap_broker(), original_constructor))) {
// Force completion of inobject slack tracking before
// generating code to finalize the instance size.
original_constructor->CompleteInobjectSlackTrackingIfActive();
// Add a dependency on the {initial_map} to make sure that this code is
// deoptimized whenever the {initial_map} changes.
MapRef initial_map = dependencies()->DependOnInitialMap(
JSFunctionRef(js_heap_broker(), original_constructor));
// Tells whether we are protected by either the {site} or a
// protector cell to do certain speculative optimizations.
bool can_inline_call = false;
// Check if we have a feedback {site} on the {node}.
if (!site.is_null()) {
ElementsKind elements_kind = site->GetElementsKind();
if (initial_map.elements_kind() != elements_kind) {
initial_map =
MapRef(js_heap_broker(),
Map::AsElementsKind(isolate(), initial_map.object<Map>(),
elements_kind));
}
can_inline_call = site->CanInlineCall();
auto site_ref = AllocationSiteRef(js_heap_broker(), site);
pretenure = dependencies()->DependOnPretenureMode(site_ref);
dependencies()->DependOnElementsKind(site_ref);
} else {
can_inline_call = isolate()->IsArrayConstructorIntact();
}
if (arity == 0) {
Node* length = jsgraph()->ZeroConstant();
int capacity = JSArray::kPreallocatedArrayElements;
return ReduceNewArray(node, length, capacity, initial_map.object<Map>(),
pretenure);
} else if (arity == 1) {
Node* length = NodeProperties::GetValueInput(node, 2);
Type length_type = NodeProperties::GetType(length);
if (!length_type.Maybe(Type::Number())) {
// Handle the single argument case, where we know that the value
// cannot be a valid Array length.
ElementsKind elements_kind = initial_map.elements_kind();
elements_kind = GetMoreGeneralElementsKind(
elements_kind, IsHoleyElementsKind(elements_kind)
? HOLEY_ELEMENTS
: PACKED_ELEMENTS);
initial_map =
MapRef(js_heap_broker(),
Map::AsElementsKind(isolate(), initial_map.object<Map>(),
elements_kind));
return ReduceNewArray(node, std::vector<Node*>{length},
initial_map.object<Map>(), pretenure);
}
if (length_type.Is(Type::SignedSmall()) && length_type.Min() >= 0 &&
length_type.Max() <= kElementLoopUnrollLimit &&
length_type.Min() == length_type.Max()) {
int capacity = static_cast<int>(length_type.Max());
return ReduceNewArray(node, length, capacity,
initial_map.object<Map>(), pretenure);
}
if (length_type.Maybe(Type::UnsignedSmall()) && can_inline_call) {
return ReduceNewArray(node, length, initial_map.object<Map>(),
pretenure);
}
} else if (arity <= JSArray::kInitialMaxFastElementArray) {
// Gather the values to store into the newly created array.
bool values_all_smis = true, values_all_numbers = true,
values_any_nonnumber = false;
std::vector<Node*> values;
values.reserve(p.arity());
for (int i = 0; i < arity; ++i) {
Node* value = NodeProperties::GetValueInput(node, 2 + i);
Type value_type = NodeProperties::GetType(value);
if (!value_type.Is(Type::SignedSmall())) {
values_all_smis = false;
}
if (!value_type.Is(Type::Number())) {
values_all_numbers = false;
}
if (!value_type.Maybe(Type::Number())) {
values_any_nonnumber = true;
}
values.push_back(value);
}
// Try to figure out the ideal elements kind statically.
ElementsKind elements_kind = initial_map.elements_kind();
if (values_all_smis) {
// Smis can be stored with any elements kind.
} else if (values_all_numbers) {
elements_kind = GetMoreGeneralElementsKind(
elements_kind, IsHoleyElementsKind(elements_kind)
? HOLEY_DOUBLE_ELEMENTS
: PACKED_DOUBLE_ELEMENTS);
} else if (values_any_nonnumber) {
elements_kind = GetMoreGeneralElementsKind(
elements_kind, IsHoleyElementsKind(elements_kind)
? HOLEY_ELEMENTS
: PACKED_ELEMENTS);
} else if (!can_inline_call) {
// We have some crazy combination of types for the {values} where
// there's no clear decision on the elements kind statically. And
// we don't have a protection against deoptimization loops for the
// checks that are introduced in the call to ReduceNewArray, so
// we cannot inline this invocation of the Array constructor here.
return NoChange();
}
initial_map =
MapRef(js_heap_broker(),
Map::AsElementsKind(isolate(), initial_map.object<Map>(),
elements_kind));
return ReduceNewArray(node, values, initial_map.object<Map>(),
pretenure);
}
}
}
// TODO(bmeurer): Optimize the subclassing case.
if (target != new_target) return NoChange();
return ReduceNewArrayToStubCall(node, site);
}
Reduction JSCreateLowering::ReduceJSCreateArrayIterator(Node* node) {
DisallowHeapAccess no_heap_access;
DCHECK_EQ(IrOpcode::kJSCreateArrayIterator, node->opcode());
CreateArrayIteratorParameters const& p =
CreateArrayIteratorParametersOf(node->op());
Node* iterated_object = NodeProperties::GetValueInput(node, 0);
Node* effect = NodeProperties::GetEffectInput(node);
Node* control = NodeProperties::GetControlInput(node);
// Create the JSArrayIterator result.
AllocationBuilder a(jsgraph(), effect, control);
a.Allocate(JSArrayIterator::kSize, NOT_TENURED, Type::OtherObject());
a.Store(AccessBuilder::ForMap(),
native_context_ref().initial_array_iterator_map());
a.Store(AccessBuilder::ForJSObjectPropertiesOrHash(),
jsgraph()->EmptyFixedArrayConstant());
a.Store(AccessBuilder::ForJSObjectElements(),
jsgraph()->EmptyFixedArrayConstant());
a.Store(AccessBuilder::ForJSArrayIteratorIteratedObject(), iterated_object);
a.Store(AccessBuilder::ForJSArrayIteratorNextIndex(),
jsgraph()->ZeroConstant());
a.Store(AccessBuilder::ForJSArrayIteratorKind(),
jsgraph()->Constant(static_cast<int>(p.kind())));
RelaxControls(node);
a.FinishAndChange(node);
return Changed(node);
}
namespace {
MapRef MapForCollectionIterationKind(const NativeContextRef& native_context,
CollectionKind collection_kind,
IterationKind iteration_kind) {
switch (collection_kind) {
case CollectionKind::kSet:
switch (iteration_kind) {
case IterationKind::kKeys:
UNREACHABLE();
case IterationKind::kValues:
return native_context.set_value_iterator_map();
case IterationKind::kEntries:
return native_context.set_key_value_iterator_map();
}
break;
case CollectionKind::kMap:
switch (iteration_kind) {
case IterationKind::kKeys:
return native_context.map_key_iterator_map();
case IterationKind::kValues:
return native_context.map_value_iterator_map();
case IterationKind::kEntries:
return native_context.map_key_value_iterator_map();
}
break;
}
UNREACHABLE();
}
} // namespace
Reduction JSCreateLowering::ReduceJSCreateCollectionIterator(Node* node) {
DisallowHeapAccess no_heap_access;
DCHECK_EQ(IrOpcode::kJSCreateCollectionIterator, node->opcode());
CreateCollectionIteratorParameters const& p =
CreateCollectionIteratorParametersOf(node->op());
Node* iterated_object = NodeProperties::GetValueInput(node, 0);
Node* effect = NodeProperties::GetEffectInput(node);
Node* control = NodeProperties::GetControlInput(node);
// Load the OrderedHashTable from the {receiver}.
Node* table = effect = graph()->NewNode(
simplified()->LoadField(AccessBuilder::ForJSCollectionTable()),
iterated_object, effect, control);
// Create the JSArrayIterator result.
AllocationBuilder a(jsgraph(), effect, control);
a.Allocate(JSCollectionIterator::kSize, NOT_TENURED, Type::OtherObject());
a.Store(AccessBuilder::ForMap(),
MapForCollectionIterationKind(
native_context_ref(), p.collection_kind(), p.iteration_kind()));
a.Store(AccessBuilder::ForJSObjectPropertiesOrHash(),
jsgraph()->EmptyFixedArrayConstant());
a.Store(AccessBuilder::ForJSObjectElements(),
jsgraph()->EmptyFixedArrayConstant());
a.Store(AccessBuilder::ForJSCollectionIteratorTable(), table);
a.Store(AccessBuilder::ForJSCollectionIteratorIndex(),
jsgraph()->ZeroConstant());
RelaxControls(node);
a.FinishAndChange(node);
return Changed(node);
}
Reduction JSCreateLowering::ReduceJSCreateBoundFunction(Node* node) {
DisallowHeapAccess no_heap_access;
DCHECK_EQ(IrOpcode::kJSCreateBoundFunction, node->opcode());
CreateBoundFunctionParameters const& p =
CreateBoundFunctionParametersOf(node->op());
int const arity = static_cast<int>(p.arity());
MapRef const map(js_heap_broker(), p.map());
Node* bound_target_function = NodeProperties::GetValueInput(node, 0);
Node* bound_this = NodeProperties::GetValueInput(node, 1);
Node* effect = NodeProperties::GetEffectInput(node);
Node* control = NodeProperties::GetControlInput(node);
// Create the [[BoundArguments]] for the result.
Node* bound_arguments = jsgraph()->EmptyFixedArrayConstant();
if (arity > 0) {
AllocationBuilder a(jsgraph(), effect, control);
a.AllocateArray(arity, factory()->fixed_array_map());
for (int i = 0; i < arity; ++i) {
a.Store(AccessBuilder::ForFixedArraySlot(i),
NodeProperties::GetValueInput(node, 2 + i));
}
bound_arguments = effect = a.Finish();
}
// Create the JSBoundFunction result.
AllocationBuilder a(jsgraph(), effect, control);
a.Allocate(JSBoundFunction::kSize, NOT_TENURED, Type::BoundFunction());
a.Store(AccessBuilder::ForMap(), map);
a.Store(AccessBuilder::ForJSObjectPropertiesOrHash(),
jsgraph()->EmptyFixedArrayConstant());
a.Store(AccessBuilder::ForJSObjectElements(),
jsgraph()->EmptyFixedArrayConstant());
a.Store(AccessBuilder::ForJSBoundFunctionBoundTargetFunction(),
bound_target_function);
a.Store(AccessBuilder::ForJSBoundFunctionBoundThis(), bound_this);
a.Store(AccessBuilder::ForJSBoundFunctionBoundArguments(), bound_arguments);
RelaxControls(node);
a.FinishAndChange(node);
return Changed(node);
}
Reduction JSCreateLowering::ReduceJSCreateClosure(Node* node) {
DisallowHeapAccess no_heap_access;
DCHECK_EQ(IrOpcode::kJSCreateClosure, node->opcode());
CreateClosureParameters const& p = CreateClosureParametersOf(node->op());
SharedFunctionInfoRef shared(js_heap_broker(), p.shared_info());
HeapObjectRef feedback_cell(js_heap_broker(), p.feedback_cell());
HeapObjectRef code(js_heap_broker(), p.code());
Node* effect = NodeProperties::GetEffectInput(node);
Node* control = NodeProperties::GetControlInput(node);
Node* context = NodeProperties::GetContextInput(node);
// Use inline allocation of closures only for instantiation sites that have
// seen more than one instantiation, this simplifies the generated code and
// also serves as a heuristic of which allocation sites benefit from it.
if (!feedback_cell.map().equals(
MapRef(js_heap_broker(), factory()->many_closures_cell_map()))) {
return NoChange();
}
MapRef function_map =
native_context_ref().GetFunctionMapFromIndex(shared.function_map_index());
DCHECK(!function_map.IsInobjectSlackTrackingInProgress());
DCHECK(!function_map.is_dictionary_map());
// TODO(turbofan): We should use the pretenure flag from {p} here,
// but currently the heuristic in the parser works against us, as
// it marks closures like
//
// args[l] = function(...) { ... }
//
// for old-space allocation, which doesn't always make sense. For
// example in case of the bluebird-parallel benchmark, where this
// is a core part of the *promisify* logic (see crbug.com/810132).
PretenureFlag pretenure = NOT_TENURED;
// Emit code to allocate the JSFunction instance.
STATIC_ASSERT(JSFunction::kSizeWithoutPrototype == 7 * kPointerSize);
AllocationBuilder a(jsgraph(), effect, control);
a.Allocate(function_map.instance_size(), pretenure, Type::Function());
a.Store(AccessBuilder::ForMap(), function_map);
a.Store(AccessBuilder::ForJSObjectPropertiesOrHash(),
jsgraph()->EmptyFixedArrayConstant());
a.Store(AccessBuilder::ForJSObjectElements(),
jsgraph()->EmptyFixedArrayConstant());
a.Store(AccessBuilder::ForJSFunctionSharedFunctionInfo(), shared);
a.Store(AccessBuilder::ForJSFunctionContext(), context);
a.Store(AccessBuilder::ForJSFunctionFeedbackCell(), feedback_cell);
a.Store(AccessBuilder::ForJSFunctionCode(), code);
STATIC_ASSERT(JSFunction::kSizeWithoutPrototype == 7 * kPointerSize);
if (function_map.has_prototype_slot()) {
a.Store(AccessBuilder::ForJSFunctionPrototypeOrInitialMap(),
jsgraph()->TheHoleConstant());
STATIC_ASSERT(JSFunction::kSizeWithPrototype == 8 * kPointerSize);
}
for (int i = 0; i < function_map.GetInObjectProperties(); i++) {
a.Store(AccessBuilder::ForJSObjectInObjectProperty(function_map, i),
jsgraph()->UndefinedConstant());
}
RelaxControls(node);
a.FinishAndChange(node);
return Changed(node);
}
Reduction JSCreateLowering::ReduceJSCreateIterResultObject(Node* node) {
DisallowHeapAccess no_heap_access;
DCHECK_EQ(IrOpcode::kJSCreateIterResultObject, node->opcode());
Node* value = NodeProperties::GetValueInput(node, 0);
Node* done = NodeProperties::GetValueInput(node, 1);
Node* effect = NodeProperties::GetEffectInput(node);
Node* iterator_result_map =
jsgraph()->Constant(native_context_ref().iterator_result_map());
// Emit code to allocate the JSIteratorResult instance.
AllocationBuilder a(jsgraph(), effect, graph()->start());
a.Allocate(JSIteratorResult::kSize);
a.Store(AccessBuilder::ForMap(), iterator_result_map);
a.Store(AccessBuilder::ForJSObjectPropertiesOrHash(),
jsgraph()->EmptyFixedArrayConstant());
a.Store(AccessBuilder::ForJSObjectElements(),
jsgraph()->EmptyFixedArrayConstant());
a.Store(AccessBuilder::ForJSIteratorResultValue(), value);
a.Store(AccessBuilder::ForJSIteratorResultDone(), done);
STATIC_ASSERT(JSIteratorResult::kSize == 5 * kPointerSize);
a.FinishAndChange(node);
return Changed(node);
}
Reduction JSCreateLowering::ReduceJSCreateStringIterator(Node* node) {
DisallowHeapAccess no_heap_access;
DCHECK_EQ(IrOpcode::kJSCreateStringIterator, node->opcode());
Node* string = NodeProperties::GetValueInput(node, 0);
Node* effect = NodeProperties::GetEffectInput(node);
Node* map = jsgraph()->Constant(native_context_ref().string_iterator_map());
// Allocate new iterator and attach the iterator to this string.
AllocationBuilder a(jsgraph(), effect, graph()->start());
a.Allocate(JSStringIterator::kSize, NOT_TENURED, Type::OtherObject());
a.Store(AccessBuilder::ForMap(), map);
a.Store(AccessBuilder::ForJSObjectPropertiesOrHash(),
jsgraph()->EmptyFixedArrayConstant());
a.Store(AccessBuilder::ForJSObjectElements(),
jsgraph()->EmptyFixedArrayConstant());
a.Store(AccessBuilder::ForJSStringIteratorString(), string);
a.Store(AccessBuilder::ForJSStringIteratorIndex(), jsgraph()->SmiConstant(0));
STATIC_ASSERT(JSIteratorResult::kSize == 5 * kPointerSize);
a.FinishAndChange(node);
return Changed(node);
}
Reduction JSCreateLowering::ReduceJSCreateKeyValueArray(Node* node) {
DisallowHeapAccess no_heap_access;
DCHECK_EQ(IrOpcode::kJSCreateKeyValueArray, node->opcode());
Node* key = NodeProperties::GetValueInput(node, 0);
Node* value = NodeProperties::GetValueInput(node, 1);
Node* effect = NodeProperties::GetEffectInput(node);
Node* array_map = jsgraph()->Constant(
native_context_ref().js_array_fast_elements_map_index());
Node* properties = jsgraph()->EmptyFixedArrayConstant();
Node* length = jsgraph()->Constant(2);
AllocationBuilder aa(jsgraph(), effect, graph()->start());
aa.AllocateArray(2, factory()->fixed_array_map());
aa.Store(AccessBuilder::ForFixedArrayElement(PACKED_ELEMENTS),
jsgraph()->ZeroConstant(), key);
aa.Store(AccessBuilder::ForFixedArrayElement(PACKED_ELEMENTS),
jsgraph()->OneConstant(), value);
Node* elements = aa.Finish();
AllocationBuilder a(jsgraph(), elements, graph()->start());
a.Allocate(JSArray::kSize);
a.Store(AccessBuilder::ForMap(), array_map);
a.Store(AccessBuilder::ForJSObjectPropertiesOrHash(), properties);
a.Store(AccessBuilder::ForJSObjectElements(), elements);
a.Store(AccessBuilder::ForJSArrayLength(PACKED_ELEMENTS), length);
STATIC_ASSERT(JSArray::kSize == 4 * kPointerSize);
a.FinishAndChange(node);
return Changed(node);
}
Reduction JSCreateLowering::ReduceJSCreatePromise(Node* node) {
DisallowHeapAccess no_heap_access;
DCHECK_EQ(IrOpcode::kJSCreatePromise, node->opcode());
Node* effect = NodeProperties::GetEffectInput(node);
MapRef promise_map = native_context_ref().promise_function_initial_map();
AllocationBuilder a(jsgraph(), effect, graph()->start());
a.Allocate(promise_map.instance_size());
a.Store(AccessBuilder::ForMap(), promise_map);
a.Store(AccessBuilder::ForJSObjectPropertiesOrHash(),
jsgraph()->EmptyFixedArrayConstant());
a.Store(AccessBuilder::ForJSObjectElements(),
jsgraph()->EmptyFixedArrayConstant());
a.Store(AccessBuilder::ForJSObjectOffset(JSPromise::kReactionsOrResultOffset),
jsgraph()->ZeroConstant());
STATIC_ASSERT(v8::Promise::kPending == 0);
a.Store(AccessBuilder::ForJSObjectOffset(JSPromise::kFlagsOffset),
jsgraph()->ZeroConstant());
STATIC_ASSERT(JSPromise::kSize == 5 * kPointerSize);
for (int i = 0; i < v8::Promise::kEmbedderFieldCount; ++i) {
a.Store(
AccessBuilder::ForJSObjectOffset(JSPromise::kSize + i * kPointerSize),
jsgraph()->ZeroConstant());
}
a.FinishAndChange(node);
return Changed(node);
}
Reduction JSCreateLowering::ReduceJSCreateLiteralArrayOrObject(Node* node) {
DCHECK(node->opcode() == IrOpcode::kJSCreateLiteralArray ||
node->opcode() == IrOpcode::kJSCreateLiteralObject);
CreateLiteralParameters const& p = CreateLiteralParametersOf(node->op());
Node* effect = NodeProperties::GetEffectInput(node);
Node* control = NodeProperties::GetControlInput(node);
FeedbackVectorRef feedback_vector(js_heap_broker(), p.feedback().vector());
ObjectRef feedback = feedback_vector.get(p.feedback().slot());
if (feedback.IsAllocationSite()) {
AllocationSiteRef site = feedback.AsAllocationSite();
if (site.IsFastLiteral()) {
PretenureFlag pretenure = NOT_TENURED;
if (FLAG_allocation_site_pretenuring) {
pretenure = dependencies()->DependOnPretenureMode(site);
}
dependencies()->DependOnElementsKinds(site);
JSObjectRef boilerplate = site.boilerplate();
Node* value = effect =
AllocateFastLiteral(effect, control, boilerplate, pretenure);
ReplaceWithValue(node, value, effect, control);
return Replace(value);
}
}
return NoChange();
}
Reduction JSCreateLowering::ReduceJSCreateEmptyLiteralArray(Node* node) {
DCHECK_EQ(IrOpcode::kJSCreateEmptyLiteralArray, node->opcode());
FeedbackParameter const& p = FeedbackParameterOf(node->op());
Handle<Object> feedback(
p.feedback().vector()->Get(p.feedback().slot())->ToObject(), isolate());
if (feedback->IsAllocationSite()) {
Handle<AllocationSite> site = Handle<AllocationSite>::cast(feedback);
DCHECK(!site->PointsToLiteral());
Handle<Map> const initial_map(
native_context()->GetInitialJSArrayMap(site->GetElementsKind()),
isolate());
auto site_ref = AllocationSiteRef(js_heap_broker(), site);
PretenureFlag const pretenure =
dependencies()->DependOnPretenureMode(site_ref);
dependencies()->DependOnElementsKind(site_ref);
Node* length = jsgraph()->ZeroConstant();
return ReduceNewArray(node, length, 0, initial_map, pretenure);
}
return NoChange();
}
Reduction JSCreateLowering::ReduceJSCreateEmptyLiteralObject(Node* node) {
DCHECK_EQ(IrOpcode::kJSCreateEmptyLiteralObject, node->opcode());
Node* effect = NodeProperties::GetEffectInput(node);
Node* control = NodeProperties::GetControlInput(node);
// Retrieve the initial map for the object.
Handle<Map> map = factory()->ObjectLiteralMapFromCache(native_context(), 0);
DCHECK(!map->is_dictionary_map());
DCHECK(!map->IsInobjectSlackTrackingInProgress());
Node* js_object_map = jsgraph()->HeapConstant(map);
// Setup elements and properties.
Node* elements = jsgraph()->EmptyFixedArrayConstant();
Node* properties = jsgraph()->EmptyFixedArrayConstant();
// Perform the allocation of the actual JSArray object.
AllocationBuilder a(jsgraph(), effect, control);
a.Allocate(map->instance_size());
a.Store(AccessBuilder::ForMap(), js_object_map);
a.Store(AccessBuilder::ForJSObjectPropertiesOrHash(), properties);
a.Store(AccessBuilder::ForJSObjectElements(), elements);
for (int i = 0; i < map->GetInObjectProperties(); i++) {
a.Store(AccessBuilder::ForJSObjectInObjectProperty(
MapRef(js_heap_broker(), map), i),
jsgraph()->UndefinedConstant());
}
RelaxControls(node);
a.FinishAndChange(node);
return Changed(node);
}
Reduction JSCreateLowering::ReduceJSCreateLiteralRegExp(Node* node) {
DisallowHeapAccess no_heap_access;
DCHECK_EQ(IrOpcode::kJSCreateLiteralRegExp, node->opcode());
CreateLiteralParameters const& p = CreateLiteralParametersOf(node->op());
Node* effect = NodeProperties::GetEffectInput(node);
Node* control = NodeProperties::GetControlInput(node);
FeedbackVectorRef feedback_vector(js_heap_broker(), p.feedback().vector());
ObjectRef feedback = feedback_vector.get(p.feedback().slot());
if (feedback.IsJSRegExp()) {
JSRegExpRef boilerplate = feedback.AsJSRegExp();
Node* value = effect = AllocateLiteralRegExp(effect, control, boilerplate);
ReplaceWithValue(node, value, effect, control);
return Replace(value);
}
return NoChange();
}
Reduction JSCreateLowering::ReduceJSCreateFunctionContext(Node* node) {
DisallowHeapAccess no_heap_access;
DCHECK_EQ(IrOpcode::kJSCreateFunctionContext, node->opcode());
const CreateFunctionContextParameters& parameters =
CreateFunctionContextParametersOf(node->op());
ScopeInfoRef scope_info(js_heap_broker(), parameters.scope_info());
int slot_count = parameters.slot_count();
ScopeType scope_type = parameters.scope_type();
// Use inline allocation for function contexts up to a size limit.
if (slot_count < kFunctionContextAllocationLimit) {
// JSCreateFunctionContext[slot_count < limit]](fun)
Node* effect = NodeProperties::GetEffectInput(node);
Node* control = NodeProperties::GetControlInput(node);
Node* context = NodeProperties::GetContextInput(node);
Node* extension = jsgraph()->TheHoleConstant();
AllocationBuilder a(jsgraph(), effect, control);
STATIC_ASSERT(Context::MIN_CONTEXT_SLOTS == 4); // Ensure fully covered.
int context_length = slot_count + Context::MIN_CONTEXT_SLOTS;
Handle<Map> map;
switch (scope_type) {
case EVAL_SCOPE:
map = factory()->eval_context_map();
break;
case FUNCTION_SCOPE:
map = factory()->function_context_map();
break;
default:
UNREACHABLE();
}
a.AllocateContext(context_length, map);
a.Store(AccessBuilder::ForContextSlot(Context::SCOPE_INFO_INDEX),
scope_info);
a.Store(AccessBuilder::ForContextSlot(Context::PREVIOUS_INDEX), context);
a.Store(AccessBuilder::ForContextSlot(Context::EXTENSION_INDEX), extension);
a.Store(AccessBuilder::ForContextSlot(Context::NATIVE_CONTEXT_INDEX),
jsgraph()->HeapConstant(native_context()));
for (int i = Context::MIN_CONTEXT_SLOTS; i < context_length; ++i) {
a.Store(AccessBuilder::ForContextSlot(i), jsgraph()->UndefinedConstant());
}
RelaxControls(node);
a.FinishAndChange(node);
return Changed(node);
}
return NoChange();
}
Reduction JSCreateLowering::ReduceJSCreateWithContext(Node* node) {
DisallowHeapAccess no_heap_access;
DCHECK_EQ(IrOpcode::kJSCreateWithContext, node->opcode());
ScopeInfoRef scope_info(js_heap_broker(), ScopeInfoOf(node->op()));
Node* extension = NodeProperties::GetValueInput(node, 0);
Node* effect = NodeProperties::GetEffectInput(node);
Node* control = NodeProperties::GetControlInput(node);
Node* context = NodeProperties::GetContextInput(node);
AllocationBuilder a(jsgraph(), effect, control);
STATIC_ASSERT(Context::MIN_CONTEXT_SLOTS == 4); // Ensure fully covered.
a.AllocateContext(Context::MIN_CONTEXT_SLOTS, factory()->with_context_map());
a.Store(AccessBuilder::ForContextSlot(Context::SCOPE_INFO_INDEX), scope_info);
a.Store(AccessBuilder::ForContextSlot(Context::PREVIOUS_INDEX), context);
a.Store(AccessBuilder::ForContextSlot(Context::EXTENSION_INDEX), extension);
a.Store(AccessBuilder::ForContextSlot(Context::NATIVE_CONTEXT_INDEX),
jsgraph()->HeapConstant(native_context()));
RelaxControls(node);
a.FinishAndChange(node);
return Changed(node);
}
Reduction JSCreateLowering::ReduceJSCreateCatchContext(Node* node) {
DisallowHeapAccess no_heap_access;
DCHECK_EQ(IrOpcode::kJSCreateCatchContext, node->opcode());
ScopeInfoRef scope_info(js_heap_broker(), ScopeInfoOf(node->op()));
Node* exception = NodeProperties::GetValueInput(node, 0);
Node* effect = NodeProperties::GetEffectInput(node);
Node* control = NodeProperties::GetControlInput(node);
Node* context = NodeProperties::GetContextInput(node);
Node* extension = jsgraph()->TheHoleConstant();
AllocationBuilder a(jsgraph(), effect, control);
STATIC_ASSERT(Context::MIN_CONTEXT_SLOTS == 4); // Ensure fully covered.
a.AllocateContext(Context::MIN_CONTEXT_SLOTS + 1,
factory()->catch_context_map());
a.Store(AccessBuilder::ForContextSlot(Context::SCOPE_INFO_INDEX), scope_info);
a.Store(AccessBuilder::ForContextSlot(Context::PREVIOUS_INDEX), context);
a.Store(AccessBuilder::ForContextSlot(Context::EXTENSION_INDEX), extension);
a.Store(AccessBuilder::ForContextSlot(Context::NATIVE_CONTEXT_INDEX),
jsgraph()->HeapConstant(native_context()));
a.Store(AccessBuilder::ForContextSlot(Context::THROWN_OBJECT_INDEX),
exception);
RelaxControls(node);
a.FinishAndChange(node);
return Changed(node);
}
Reduction JSCreateLowering::ReduceJSCreateBlockContext(Node* node) {
DisallowHeapAccess no_heap_access;
DCHECK_EQ(IrOpcode::kJSCreateBlockContext, node->opcode());
ScopeInfoRef scope_info(js_heap_broker(), ScopeInfoOf(node->op()));
int const context_length = scope_info.ContextLength();
// Use inline allocation for block contexts up to a size limit.
if (context_length < kBlockContextAllocationLimit) {
// JSCreateBlockContext[scope[length < limit]](fun)
Node* effect = NodeProperties::GetEffectInput(node);
Node* control = NodeProperties::GetControlInput(node);
Node* context = NodeProperties::GetContextInput(node);
Node* extension = jsgraph()->TheHoleConstant();
AllocationBuilder a(jsgraph(), effect, control);
STATIC_ASSERT(Context::MIN_CONTEXT_SLOTS == 4); // Ensure fully covered.
a.AllocateContext(context_length, factory()->block_context_map());
a.Store(AccessBuilder::ForContextSlot(Context::SCOPE_INFO_INDEX),
scope_info);
a.Store(AccessBuilder::ForContextSlot(Context::PREVIOUS_INDEX), context);
a.Store(AccessBuilder::ForContextSlot(Context::EXTENSION_INDEX), extension);
a.Store(AccessBuilder::ForContextSlot(Context::NATIVE_CONTEXT_INDEX),
jsgraph()->HeapConstant(native_context()));
for (int i = Context::MIN_CONTEXT_SLOTS; i < context_length; ++i) {
a.Store(AccessBuilder::ForContextSlot(i), jsgraph()->UndefinedConstant());
}
RelaxControls(node);
a.FinishAndChange(node);
return Changed(node);
}
return NoChange();
}
Reduction JSCreateLowering::ReduceJSCreateObject(Node* node) {
DisallowHeapAccess no_heap_access;
DCHECK_EQ(IrOpcode::kJSCreateObject, node->opcode());
Node* effect = NodeProperties::GetEffectInput(node);
Node* control = NodeProperties::GetControlInput(node);
Node* prototype = NodeProperties::GetValueInput(node, 0);
Type prototype_type = NodeProperties::GetType(prototype);
if (!prototype_type.IsHeapConstant()) return NoChange();
HeapObjectRef prototype_const = prototype_type.AsHeapConstant()->Ref();
auto maybe_instance_map = prototype_const.TryGetObjectCreateMap();
if (!maybe_instance_map) return NoChange();
MapRef instance_map = maybe_instance_map.value();
Node* properties = jsgraph()->EmptyFixedArrayConstant();
if (instance_map.is_dictionary_map()) {
DCHECK_EQ(prototype_const.type().oddball_type(), OddballType::kNull);
// Allocate an empty NameDictionary as backing store for the properties.
Handle<Map> map = isolate()->factory()->name_dictionary_map();
int capacity =
NameDictionary::ComputeCapacity(NameDictionary::kInitialCapacity);
DCHECK(base::bits::IsPowerOfTwo(capacity));
int length = NameDictionary::EntryToIndex(capacity);
int size = NameDictionary::SizeFor(length);
AllocationBuilder a(jsgraph(), effect, control);
a.Allocate(size, NOT_TENURED, Type::Any());
a.Store(AccessBuilder::ForMap(), map);
// Initialize FixedArray fields.
a.Store(AccessBuilder::ForFixedArrayLength(),
jsgraph()->SmiConstant(length));
// Initialize HashTable fields.
a.Store(AccessBuilder::ForHashTableBaseNumberOfElements(),
jsgraph()->SmiConstant(0));
a.Store(AccessBuilder::ForHashTableBaseNumberOfDeletedElement(),
jsgraph()->SmiConstant(0));
a.Store(AccessBuilder::ForHashTableBaseCapacity(),
jsgraph()->SmiConstant(capacity));
// Initialize Dictionary fields.
a.Store(AccessBuilder::ForDictionaryNextEnumerationIndex(),
jsgraph()->SmiConstant(PropertyDetails::kInitialIndex));
a.Store(AccessBuilder::ForDictionaryObjectHashIndex(),
jsgraph()->SmiConstant(PropertyArray::kNoHashSentinel));
// Initialize the Properties fields.
Node* undefined = jsgraph()->UndefinedConstant();
STATIC_ASSERT(NameDictionary::kElementsStartIndex ==
NameDictionary::kObjectHashIndex + 1);
for (int index = NameDictionary::kElementsStartIndex; index < length;
index++) {
a.Store(AccessBuilder::ForFixedArraySlot(index, kNoWriteBarrier),
undefined);
}
properties = effect = a.Finish();
}
int const instance_size = instance_map.instance_size();
if (instance_size > kMaxRegularHeapObjectSize) return NoChange();
CHECK(!instance_map.IsInobjectSlackTrackingInProgress());
// Emit code to allocate the JSObject instance for the given
// {instance_map}.
AllocationBuilder a(jsgraph(), effect, control);
a.Allocate(instance_size, NOT_TENURED, Type::Any());
a.Store(AccessBuilder::ForMap(), instance_map);
a.Store(AccessBuilder::ForJSObjectPropertiesOrHash(), properties);
a.Store(AccessBuilder::ForJSObjectElements(),
jsgraph()->EmptyFixedArrayConstant());
// Initialize Object fields.
Node* undefined = jsgraph()->UndefinedConstant();
for (int offset = JSObject::kHeaderSize; offset < instance_size;
offset += kPointerSize) {
a.Store(AccessBuilder::ForJSObjectOffset(offset, kNoWriteBarrier),
undefined);
}
Node* value = effect = a.Finish();
ReplaceWithValue(node, value, effect, control);
return Replace(value);
}
// Helper that allocates a FixedArray holding argument values recorded in the
// given {frame_state}. Serves as backing store for JSCreateArguments nodes.
Node* JSCreateLowering::AllocateArguments(Node* effect, Node* control,
Node* frame_state) {
FrameStateInfo state_info = FrameStateInfoOf(frame_state->op());
int argument_count = state_info.parameter_count() - 1; // Minus receiver.
if (argument_count == 0) return jsgraph()->EmptyFixedArrayConstant();
// Prepare an iterator over argument values recorded in the frame state.
Node* const parameters = frame_state->InputAt(kFrameStateParametersInput);
StateValuesAccess parameters_access(parameters);
auto parameters_it = ++parameters_access.begin();
// Actually allocate the backing store.
AllocationBuilder a(jsgraph(), effect, control);
a.AllocateArray(argument_count, factory()->fixed_array_map());
for (int i = 0; i < argument_count; ++i, ++parameters_it) {
DCHECK_NOT_NULL((*parameters_it).node);
a.Store(AccessBuilder::ForFixedArraySlot(i), (*parameters_it).node);
}
return a.Finish();
}
// Helper that allocates a FixedArray holding argument values recorded in the
// given {frame_state}. Serves as backing store for JSCreateArguments nodes.
Node* JSCreateLowering::AllocateRestArguments(Node* effect, Node* control,
Node* frame_state,
int start_index) {
FrameStateInfo state_info = FrameStateInfoOf(frame_state->op());
int argument_count = state_info.parameter_count() - 1; // Minus receiver.
int num_elements = std::max(0, argument_count - start_index);
if (num_elements == 0) return jsgraph()->EmptyFixedArrayConstant();
// Prepare an iterator over argument values recorded in the frame state.
Node* const parameters = frame_state->InputAt(kFrameStateParametersInput);
StateValuesAccess parameters_access(parameters);
auto parameters_it = ++parameters_access.begin();
// Skip unused arguments.
for (int i = 0; i < start_index; i++) {
++parameters_it;
}
// Actually allocate the backing store.
AllocationBuilder a(jsgraph(), effect, control);
a.AllocateArray(num_elements, factory()->fixed_array_map());
for (int i = 0; i < num_elements; ++i, ++parameters_it) {
DCHECK_NOT_NULL((*parameters_it).node);
a.Store(AccessBuilder::ForFixedArraySlot(i), (*parameters_it).node);
}
return a.Finish();
}
// Helper that allocates a FixedArray serving as a parameter map for values
// recorded in the given {frame_state}. Some elements map to slots within the
// given {context}. Serves as backing store for JSCreateArguments nodes.
Node* JSCreateLowering::AllocateAliasedArguments(
Node* effect, Node* control, Node* frame_state, Node* context,
const SharedFunctionInfoRef& shared, bool* has_aliased_arguments) {
FrameStateInfo state_info = FrameStateInfoOf(frame_state->op());
int argument_count = state_info.parameter_count() - 1; // Minus receiver.
if (argument_count == 0) return jsgraph()->EmptyFixedArrayConstant();
// If there is no aliasing, the arguments object elements are not special in
// any way, we can just return an unmapped backing store instead.
int parameter_count = shared.internal_formal_parameter_count();
if (parameter_count == 0) {
return AllocateArguments(effect, control, frame_state);
}
// Calculate number of argument values being aliased/mapped.
int mapped_count = Min(argument_count, parameter_count);
*has_aliased_arguments = true;
// Prepare an iterator over argument values recorded in the frame state.
Node* const parameters = frame_state->InputAt(kFrameStateParametersInput);
StateValuesAccess parameters_access(parameters);
auto parameters_it = ++parameters_access.begin();
// The unmapped argument values recorded in the frame state are stored yet
// another indirection away and then linked into the parameter map below,
// whereas mapped argument values are replaced with a hole instead.
AllocationBuilder aa(jsgraph(), effect, control);
aa.AllocateArray(argument_count, factory()->fixed_array_map());
for (int i = 0; i < mapped_count; ++i, ++parameters_it) {
aa.Store(AccessBuilder::ForFixedArraySlot(i), jsgraph()->TheHoleConstant());
}
for (int i = mapped_count; i < argument_count; ++i, ++parameters_it) {
DCHECK_NOT_NULL((*parameters_it).node);
aa.Store(AccessBuilder::ForFixedArraySlot(i), (*parameters_it).node);
}
Node* arguments = aa.Finish();
// Actually allocate the backing store.
AllocationBuilder a(jsgraph(), arguments, control);
a.AllocateArray(mapped_count + 2, factory()->sloppy_arguments_elements_map());
a.Store(AccessBuilder::ForFixedArraySlot(0), context);
a.Store(AccessBuilder::ForFixedArraySlot(1), arguments);
for (int i = 0; i < mapped_count; ++i) {
int idx = Context::MIN_CONTEXT_SLOTS + parameter_count - 1 - i;
a.Store(AccessBuilder::ForFixedArraySlot(i + 2), jsgraph()->Constant(idx));
}
return a.Finish();
}
// Helper that allocates a FixedArray serving as a parameter map for values
// unknown at compile-time, the true {arguments_length} and {arguments_frame}
// values can only be determined dynamically at run-time and are provided.
// Serves as backing store for JSCreateArguments nodes.
Node* JSCreateLowering::AllocateAliasedArguments(
Node* effect, Node* control, Node* context, Node* arguments_frame,
Node* arguments_length, const SharedFunctionInfoRef& shared,
bool* has_aliased_arguments) {
// If there is no aliasing, the arguments object elements are not
// special in any way, we can just return an unmapped backing store.
int parameter_count = shared.internal_formal_parameter_count();
if (parameter_count == 0) {
return graph()->NewNode(simplified()->NewArgumentsElements(0),
arguments_frame, arguments_length, effect);
}
// From here on we are going to allocate a mapped (aka. aliased) elements
// backing store. We do not statically know how many arguments exist, but
// dynamically selecting the hole for some of the "mapped" elements allows
// using a static shape for the parameter map.
int mapped_count = parameter_count;
*has_aliased_arguments = true;
// The unmapped argument values are stored yet another indirection away and
// then linked into the parameter map below, whereas mapped argument values
// (i.e. the first {mapped_count} elements) are replaced with a hole instead.
Node* arguments =
graph()->NewNode(simplified()->NewArgumentsElements(mapped_count),
arguments_frame, arguments_length, effect);
// Actually allocate the backing store.
AllocationBuilder a(jsgraph(), arguments, control);
a.AllocateArray(mapped_count + 2, factory()->sloppy_arguments_elements_map());
a.Store(AccessBuilder::ForFixedArraySlot(0), context);
a.Store(AccessBuilder::ForFixedArraySlot(1), arguments);
for (int i = 0; i < mapped_count; ++i) {
int idx = Context::MIN_CONTEXT_SLOTS + parameter_count - 1 - i;
Node* value = graph()->NewNode(
common()->Select(MachineRepresentation::kTagged),
graph()->NewNode(simplified()->NumberLessThan(), jsgraph()->Constant(i),
arguments_length),
jsgraph()->Constant(idx), jsgraph()->TheHoleConstant());
a.Store(AccessBuilder::ForFixedArraySlot(i + 2), value);
}
return a.Finish();
}
Node* JSCreateLowering::AllocateElements(Node* effect, Node* control,
ElementsKind elements_kind,
int capacity,
PretenureFlag pretenure) {
DCHECK_LE(1, capacity);
DCHECK_LE(capacity, JSArray::kInitialMaxFastElementArray);
Handle<Map> elements_map = IsDoubleElementsKind(elements_kind)
? factory()->fixed_double_array_map()
: factory()->fixed_array_map();
ElementAccess access = IsDoubleElementsKind(elements_kind)
? AccessBuilder::ForFixedDoubleArrayElement()
: AccessBuilder::ForFixedArrayElement();
Node* value = jsgraph()->TheHoleConstant();
// Actually allocate the backing store.
AllocationBuilder a(jsgraph(), effect, control);
a.AllocateArray(capacity, elements_map, pretenure);
for (int i = 0; i < capacity; ++i) {
Node* index = jsgraph()->Constant(i);
a.Store(access, index, value);
}
return a.Finish();
}
Node* JSCreateLowering::AllocateElements(Node* effect, Node* control,
ElementsKind elements_kind,
std::vector<Node*> const& values,
PretenureFlag pretenure) {
int const capacity = static_cast<int>(values.size());
DCHECK_LE(1, capacity);
DCHECK_LE(capacity, JSArray::kInitialMaxFastElementArray);
Handle<Map> elements_map = IsDoubleElementsKind(elements_kind)
? factory()->fixed_double_array_map()
: factory()->fixed_array_map();
ElementAccess access = IsDoubleElementsKind(elements_kind)
? AccessBuilder::ForFixedDoubleArrayElement()
: AccessBuilder::ForFixedArrayElement();
// Actually allocate the backing store.
AllocationBuilder a(jsgraph(), effect, control);
a.AllocateArray(capacity, elements_map, pretenure);
for (int i = 0; i < capacity; ++i) {
Node* index = jsgraph()->Constant(i);
a.Store(access, index, values[i]);
}
return a.Finish();
}
Node* JSCreateLowering::AllocateFastLiteral(Node* effect, Node* control,
JSObjectRef boilerplate,
PretenureFlag pretenure) {
// Setup the properties backing store.
Node* properties = jsgraph()->EmptyFixedArrayConstant();
// Compute the in-object properties to store first (might have effects).
MapRef boilerplate_map = boilerplate.map();
ZoneVector<std::pair<FieldAccess, Node*>> inobject_fields(zone());
inobject_fields.reserve(boilerplate_map.GetInObjectProperties());
int const boilerplate_nof = boilerplate_map.NumberOfOwnDescriptors();
for (int i = 0; i < boilerplate_nof; ++i) {
PropertyDetails const property_details =
boilerplate_map.GetPropertyDetails(i);
if (property_details.location() != kField) continue;
DCHECK_EQ(kData, property_details.kind());
NameRef property_name = boilerplate_map.GetPropertyKey(i);
FieldIndex index = boilerplate_map.GetFieldIndexFor(i);
FieldAccess access = {
kTaggedBase, index.offset(), property_name.object<Name>(),
MaybeHandle<Map>(), Type::Any(), MachineType::AnyTagged(),
kFullWriteBarrier};
Node* value;
if (boilerplate.IsUnboxedDoubleField(index)) {
access.machine_type = MachineType::Float64();
access.type = Type::Number();
value = jsgraph()->Constant(boilerplate.RawFastDoublePropertyAt(index));
} else {
ObjectRef boilerplate_value = boilerplate.RawFastPropertyAt(index);
if (boilerplate_value.IsJSObject()) {
JSObjectRef boilerplate_object = boilerplate_value.AsJSObject();
value = effect =
AllocateFastLiteral(effect, control, boilerplate_object, pretenure);
} else if (property_details.representation().IsDouble()) {
double number = boilerplate_value.AsMutableHeapNumber().value();
// Allocate a mutable HeapNumber box and store the value into it.
AllocationBuilder builder(jsgraph(), effect, control);
builder.Allocate(HeapNumber::kSize, pretenure);
builder.Store(AccessBuilder::ForMap(),
factory()->mutable_heap_number_map());
builder.Store(AccessBuilder::ForHeapNumberValue(),
jsgraph()->Constant(number));
value = effect = builder.Finish();
} else if (property_details.representation().IsSmi()) {
// Ensure that value is stored as smi.
value = boilerplate_value.oddball_type() == OddballType::kUninitialized
? jsgraph()->ZeroConstant()
: jsgraph()->Constant(boilerplate_value.AsSmi());
} else {
value = jsgraph()->Constant(boilerplate_value);
}
}
inobject_fields.push_back(std::make_pair(access, value));
}
// Fill slack at the end of the boilerplate object with filler maps.
int const boilerplate_length = boilerplate_map.GetInObjectProperties();
for (int index = static_cast<int>(inobject_fields.size());
index < boilerplate_length; ++index) {
FieldAccess access =
AccessBuilder::ForJSObjectInObjectProperty(boilerplate_map, index);
Node* value = jsgraph()->HeapConstant(factory()->one_pointer_filler_map());
inobject_fields.push_back(std::make_pair(access, value));
}
// Setup the elements backing store.
Node* elements =
AllocateFastLiteralElements(effect, control, boilerplate, pretenure);
if (elements->op()->EffectOutputCount() > 0) effect = elements;
// Actually allocate and initialize the object.
AllocationBuilder builder(jsgraph(), effect, control);
builder.Allocate(boilerplate_map.instance_size(), pretenure,
Type::For(js_heap_broker(), boilerplate_map.object<Map>()));
builder.Store(AccessBuilder::ForMap(), boilerplate_map);
builder.Store(AccessBuilder::ForJSObjectPropertiesOrHash(), properties);
builder.Store(AccessBuilder::ForJSObjectElements(), elements);
if (boilerplate_map.IsJSArrayMap()) {
JSArrayRef boilerplate_array = boilerplate.AsJSArray();
builder.Store(
AccessBuilder::ForJSArrayLength(boilerplate_array.GetElementsKind()),
boilerplate_array.length());
}
for (auto const& inobject_field : inobject_fields) {
builder.Store(inobject_field.first, inobject_field.second);
}
return builder.Finish();
}
Node* JSCreateLowering::AllocateFastLiteralElements(Node* effect, Node* control,
JSObjectRef boilerplate,
PretenureFlag pretenure) {
FixedArrayBaseRef boilerplate_elements = boilerplate.elements();
// Empty or copy-on-write elements just store a constant.
int const elements_length = boilerplate_elements.length();
MapRef elements_map = boilerplate_elements.map();
if (boilerplate_elements.length() == 0 || elements_map.IsFixedCowArrayMap()) {
if (pretenure == TENURED) {
boilerplate.EnsureElementsTenured();
boilerplate_elements = boilerplate.elements();
}
return jsgraph()->HeapConstant(boilerplate_elements.object<HeapObject>());
}
// Compute the elements to store first (might have effects).
ZoneVector<Node*> elements_values(elements_length, zone());
if (elements_map.instance_type() == FIXED_DOUBLE_ARRAY_TYPE) {
FixedDoubleArrayRef elements = boilerplate_elements.AsFixedDoubleArray();
for (int i = 0; i < elements_length; ++i) {
if (elements.is_the_hole(i)) {
elements_values[i] = jsgraph()->TheHoleConstant();
} else {
elements_values[i] = jsgraph()->Constant(elements.get_scalar(i));
}
}
} else {
FixedArrayRef elements = boilerplate_elements.AsFixedArray();
for (int i = 0; i < elements_length; ++i) {
if (elements.is_the_hole(i)) {
elements_values[i] = jsgraph()->TheHoleConstant();
} else {
ObjectRef element_value = elements.get(i);
if (element_value.IsJSObject()) {
elements_values[i] = effect = AllocateFastLiteral(
effect, control, element_value.AsJSObject(), pretenure);
} else {
elements_values[i] = jsgraph()->Constant(element_value);
}
}
}
}
// Allocate the backing store array and store the elements.
AllocationBuilder builder(jsgraph(), effect, control);
builder.AllocateArray(elements_length, elements_map.object<Map>(), pretenure);
ElementAccess const access =
(elements_map.instance_type() == FIXED_DOUBLE_ARRAY_TYPE)
? AccessBuilder::ForFixedDoubleArrayElement()
: AccessBuilder::ForFixedArrayElement();
for (int i = 0; i < elements_length; ++i) {
builder.Store(access, jsgraph()->Constant(i), elements_values[i]);
}
return builder.Finish();
}
Node* JSCreateLowering::AllocateLiteralRegExp(Node* effect, Node* control,
JSRegExpRef boilerplate) {
MapRef boilerplate_map = boilerplate.map();
// Sanity check that JSRegExp object layout hasn't changed.
STATIC_ASSERT(JSRegExp::kDataOffset == JSObject::kHeaderSize);
STATIC_ASSERT(JSRegExp::kSourceOffset ==
JSRegExp::kDataOffset + kPointerSize);
STATIC_ASSERT(JSRegExp::kFlagsOffset ==
JSRegExp::kSourceOffset + kPointerSize);
STATIC_ASSERT(JSRegExp::kSize == JSRegExp::kFlagsOffset + kPointerSize);
STATIC_ASSERT(JSRegExp::kLastIndexOffset == JSRegExp::kSize);
STATIC_ASSERT(JSRegExp::kInObjectFieldCount == 1); // LastIndex.
const PretenureFlag pretenure = NOT_TENURED;
const int size =
JSRegExp::kSize + JSRegExp::kInObjectFieldCount * kPointerSize;
AllocationBuilder builder(jsgraph(), effect, control);
builder.Allocate(size, pretenure,
Type::For(js_heap_broker(), boilerplate_map.object<Map>()));
builder.Store(AccessBuilder::ForMap(), boilerplate_map);
builder.Store(AccessBuilder::ForJSObjectPropertiesOrHash(),
boilerplate.raw_properties_or_hash());
builder.Store(AccessBuilder::ForJSObjectElements(), boilerplate.elements());
builder.Store(AccessBuilder::ForJSRegExpData(), boilerplate.data());
builder.Store(AccessBuilder::ForJSRegExpSource(), boilerplate.source());
builder.Store(AccessBuilder::ForJSRegExpFlags(), boilerplate.flags());
builder.Store(AccessBuilder::ForJSRegExpLastIndex(),
boilerplate.last_index());
return builder.Finish();
}
Factory* JSCreateLowering::factory() const { return isolate()->factory(); }
Graph* JSCreateLowering::graph() const { return jsgraph()->graph(); }
Isolate* JSCreateLowering::isolate() const { return jsgraph()->isolate(); }
CommonOperatorBuilder* JSCreateLowering::common() const {
return jsgraph()->common();
}
SimplifiedOperatorBuilder* JSCreateLowering::simplified() const {
return jsgraph()->simplified();
}
NativeContextRef JSCreateLowering::native_context_ref() const {
return NativeContextRef(js_heap_broker(), native_context());
}
} // namespace compiler
} // namespace internal
} // namespace v8
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