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js-typed-lowering.cc
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js-typed-lowering.cc
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// Copyright 2014 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-typed-lowering.h"
#include "src/ast/modules.h"
#include "src/builtins/builtins-utils.h"
#include "src/code-factory.h"
#include "src/compiler/access-builder.h"
#include "src/compiler/allocation-builder.h"
#include "src/compiler/js-graph.h"
#include "src/compiler/linkage.h"
#include "src/compiler/node-matchers.h"
#include "src/compiler/node-properties.h"
#include "src/compiler/operator-properties.h"
#include "src/compiler/type-cache.h"
#include "src/compiler/types.h"
#include "src/objects-inl.h"
namespace v8 {
namespace internal {
namespace compiler {
// A helper class to simplify the process of reducing a single binop node with a
// JSOperator. This class manages the rewriting of context, control, and effect
// dependencies during lowering of a binop and contains numerous helper
// functions for matching the types of inputs to an operation.
class JSBinopReduction final {
public:
JSBinopReduction(JSTypedLowering* lowering, Node* node)
: lowering_(lowering), node_(node) {}
bool GetCompareNumberOperationHint(NumberOperationHint* hint) {
DCHECK_EQ(1, node_->op()->EffectOutputCount());
switch (CompareOperationHintOf(node_->op())) {
case CompareOperationHint::kSignedSmall:
*hint = NumberOperationHint::kSignedSmall;
return true;
case CompareOperationHint::kNumber:
*hint = NumberOperationHint::kNumber;
return true;
case CompareOperationHint::kNumberOrOddball:
*hint = NumberOperationHint::kNumberOrOddball;
return true;
case CompareOperationHint::kAny:
case CompareOperationHint::kNone:
case CompareOperationHint::kString:
case CompareOperationHint::kSymbol:
case CompareOperationHint::kReceiver:
case CompareOperationHint::kInternalizedString:
break;
}
return false;
}
bool IsInternalizedStringCompareOperation() {
DCHECK_EQ(1, node_->op()->EffectOutputCount());
return (CompareOperationHintOf(node_->op()) ==
CompareOperationHint::kInternalizedString) &&
BothInputsMaybe(Type::InternalizedString());
}
bool IsReceiverCompareOperation() {
DCHECK_EQ(1, node_->op()->EffectOutputCount());
return (CompareOperationHintOf(node_->op()) ==
CompareOperationHint::kReceiver) &&
BothInputsMaybe(Type::Receiver());
}
bool IsStringCompareOperation() {
DCHECK_EQ(1, node_->op()->EffectOutputCount());
return (CompareOperationHintOf(node_->op()) ==
CompareOperationHint::kString) &&
BothInputsMaybe(Type::String());
}
bool IsSymbolCompareOperation() {
DCHECK_EQ(1, node_->op()->EffectOutputCount());
return (CompareOperationHintOf(node_->op()) ==
CompareOperationHint::kSymbol) &&
BothInputsMaybe(Type::Symbol());
}
// Check if a string addition will definitely result in creating a ConsString,
// i.e. if the combined length of the resulting string exceeds the ConsString
// minimum length.
bool ShouldCreateConsString() {
DCHECK_EQ(IrOpcode::kJSAdd, node_->opcode());
DCHECK(OneInputIs(Type::String()));
if (BothInputsAre(Type::String()) ||
BinaryOperationHintOf(node_->op()) == BinaryOperationHint::kString) {
HeapObjectBinopMatcher m(node_);
if (m.right().HasValue() && m.right().Value()->IsString()) {
Handle<String> right_string = Handle<String>::cast(m.right().Value());
if (right_string->length() >= ConsString::kMinLength) return true;
}
if (m.left().HasValue() && m.left().Value()->IsString()) {
Handle<String> left_string = Handle<String>::cast(m.left().Value());
if (left_string->length() >= ConsString::kMinLength) {
// The invariant for ConsString requires the left hand side to be
// a sequential or external string if the right hand side is the
// empty string. Since we don't know anything about the right hand
// side here, we must ensure that the left hand side satisfy the
// constraints independent of the right hand side.
return left_string->IsSeqString() || left_string->IsExternalString();
}
}
}
return false;
}
// Inserts a CheckReceiver for the left input.
void CheckLeftInputToReceiver() {
Node* left_input = graph()->NewNode(simplified()->CheckReceiver(), left(),
effect(), control());
node_->ReplaceInput(0, left_input);
update_effect(left_input);
}
// Checks that both inputs are Receiver, and if we don't know
// statically that one side is already a Receiver, insert a
// CheckReceiver node.
void CheckInputsToReceiver() {
if (!left_type()->Is(Type::Receiver())) {
CheckLeftInputToReceiver();
}
if (!right_type()->Is(Type::Receiver())) {
Node* right_input = graph()->NewNode(simplified()->CheckReceiver(),
right(), effect(), control());
node_->ReplaceInput(1, right_input);
update_effect(right_input);
}
}
// Checks that both inputs are Symbol, and if we don't know
// statically that one side is already a Symbol, insert a
// CheckSymbol node.
void CheckInputsToSymbol() {
if (!left_type()->Is(Type::Symbol())) {
Node* left_input = graph()->NewNode(simplified()->CheckSymbol(), left(),
effect(), control());
node_->ReplaceInput(0, left_input);
update_effect(left_input);
}
if (!right_type()->Is(Type::Symbol())) {
Node* right_input = graph()->NewNode(simplified()->CheckSymbol(), right(),
effect(), control());
node_->ReplaceInput(1, right_input);
update_effect(right_input);
}
}
// Checks that both inputs are String, and if we don't know
// statically that one side is already a String, insert a
// CheckString node.
void CheckInputsToString() {
if (!left_type()->Is(Type::String())) {
Node* left_input = graph()->NewNode(simplified()->CheckString(), left(),
effect(), control());
node_->ReplaceInput(0, left_input);
update_effect(left_input);
}
if (!right_type()->Is(Type::String())) {
Node* right_input = graph()->NewNode(simplified()->CheckString(), right(),
effect(), control());
node_->ReplaceInput(1, right_input);
update_effect(right_input);
}
}
// Checks that both inputs are InternalizedString, and if we don't know
// statically that one side is already an InternalizedString, insert a
// CheckInternalizedString node.
void CheckInputsToInternalizedString() {
if (!left_type()->Is(Type::UniqueName())) {
Node* left_input = graph()->NewNode(
simplified()->CheckInternalizedString(), left(), effect(), control());
node_->ReplaceInput(0, left_input);
update_effect(left_input);
}
if (!right_type()->Is(Type::UniqueName())) {
Node* right_input =
graph()->NewNode(simplified()->CheckInternalizedString(), right(),
effect(), control());
node_->ReplaceInput(1, right_input);
update_effect(right_input);
}
}
void ConvertInputsToNumber() {
DCHECK(left_type()->Is(Type::PlainPrimitive()));
DCHECK(right_type()->Is(Type::PlainPrimitive()));
node_->ReplaceInput(0, ConvertPlainPrimitiveToNumber(left()));
node_->ReplaceInput(1, ConvertPlainPrimitiveToNumber(right()));
}
void ConvertInputsToUI32(Signedness left_signedness,
Signedness right_signedness) {
node_->ReplaceInput(0, ConvertToUI32(left(), left_signedness));
node_->ReplaceInput(1, ConvertToUI32(right(), right_signedness));
}
void SwapInputs() {
Node* l = left();
Node* r = right();
node_->ReplaceInput(0, r);
node_->ReplaceInput(1, l);
}
// Remove all effect and control inputs and outputs to this node and change
// to the pure operator {op}.
Reduction ChangeToPureOperator(const Operator* op, Type* type = Type::Any()) {
DCHECK_EQ(0, op->EffectInputCount());
DCHECK_EQ(false, OperatorProperties::HasContextInput(op));
DCHECK_EQ(0, op->ControlInputCount());
DCHECK_EQ(2, op->ValueInputCount());
// Remove the effects from the node, and update its effect/control usages.
if (node_->op()->EffectInputCount() > 0) {
lowering_->RelaxEffectsAndControls(node_);
}
// Remove the inputs corresponding to context, effect, and control.
NodeProperties::RemoveNonValueInputs(node_);
// Finally, update the operator to the new one.
NodeProperties::ChangeOp(node_, op);
// TODO(jarin): Replace the explicit typing hack with a call to some method
// that encapsulates changing the operator and re-typing.
Type* node_type = NodeProperties::GetType(node_);
NodeProperties::SetType(node_, Type::Intersect(node_type, type, zone()));
return lowering_->Changed(node_);
}
Reduction ChangeToSpeculativeOperator(const Operator* op, Type* upper_bound) {
DCHECK_EQ(1, op->EffectInputCount());
DCHECK_EQ(1, op->EffectOutputCount());
DCHECK_EQ(false, OperatorProperties::HasContextInput(op));
DCHECK_EQ(1, op->ControlInputCount());
DCHECK_EQ(0, op->ControlOutputCount());
DCHECK_EQ(0, OperatorProperties::GetFrameStateInputCount(op));
DCHECK_EQ(2, op->ValueInputCount());
DCHECK_EQ(1, node_->op()->EffectInputCount());
DCHECK_EQ(1, node_->op()->EffectOutputCount());
DCHECK_EQ(1, node_->op()->ControlInputCount());
DCHECK_EQ(2, node_->op()->ValueInputCount());
// Reconnect the control output to bypass the IfSuccess node and
// possibly disconnect from the IfException node.
lowering_->RelaxControls(node_);
// Remove the frame state and the context.
if (OperatorProperties::HasFrameStateInput(node_->op())) {
node_->RemoveInput(NodeProperties::FirstFrameStateIndex(node_));
}
node_->RemoveInput(NodeProperties::FirstContextIndex(node_));
NodeProperties::ChangeOp(node_, op);
// Update the type to number.
Type* node_type = NodeProperties::GetType(node_);
NodeProperties::SetType(node_,
Type::Intersect(node_type, upper_bound, zone()));
return lowering_->Changed(node_);
}
const Operator* NumberOp() {
switch (node_->opcode()) {
case IrOpcode::kJSAdd:
return simplified()->NumberAdd();
case IrOpcode::kJSSubtract:
return simplified()->NumberSubtract();
case IrOpcode::kJSMultiply:
return simplified()->NumberMultiply();
case IrOpcode::kJSDivide:
return simplified()->NumberDivide();
case IrOpcode::kJSModulus:
return simplified()->NumberModulus();
case IrOpcode::kJSBitwiseAnd:
return simplified()->NumberBitwiseAnd();
case IrOpcode::kJSBitwiseOr:
return simplified()->NumberBitwiseOr();
case IrOpcode::kJSBitwiseXor:
return simplified()->NumberBitwiseXor();
case IrOpcode::kJSShiftLeft:
return simplified()->NumberShiftLeft();
case IrOpcode::kJSShiftRight:
return simplified()->NumberShiftRight();
case IrOpcode::kJSShiftRightLogical:
return simplified()->NumberShiftRightLogical();
default:
break;
}
UNREACHABLE();
}
const Operator* NumberOpFromSpeculativeNumberOp() {
switch (node_->opcode()) {
case IrOpcode::kSpeculativeNumberEqual:
return simplified()->NumberEqual();
case IrOpcode::kSpeculativeNumberLessThan:
return simplified()->NumberLessThan();
case IrOpcode::kSpeculativeNumberLessThanOrEqual:
return simplified()->NumberLessThanOrEqual();
case IrOpcode::kSpeculativeNumberAdd:
return simplified()->NumberAdd();
case IrOpcode::kSpeculativeNumberSubtract:
return simplified()->NumberSubtract();
case IrOpcode::kSpeculativeNumberMultiply:
return simplified()->NumberMultiply();
case IrOpcode::kSpeculativeNumberDivide:
return simplified()->NumberDivide();
case IrOpcode::kSpeculativeNumberModulus:
return simplified()->NumberModulus();
default:
break;
}
UNREACHABLE();
}
bool LeftInputIs(Type* t) { return left_type()->Is(t); }
bool RightInputIs(Type* t) { return right_type()->Is(t); }
bool OneInputIs(Type* t) { return LeftInputIs(t) || RightInputIs(t); }
bool BothInputsAre(Type* t) { return LeftInputIs(t) && RightInputIs(t); }
bool BothInputsMaybe(Type* t) {
return left_type()->Maybe(t) && right_type()->Maybe(t);
}
bool OneInputCannotBe(Type* t) {
return !left_type()->Maybe(t) || !right_type()->Maybe(t);
}
bool NeitherInputCanBe(Type* t) {
return !left_type()->Maybe(t) && !right_type()->Maybe(t);
}
Node* effect() { return NodeProperties::GetEffectInput(node_); }
Node* control() { return NodeProperties::GetControlInput(node_); }
Node* context() { return NodeProperties::GetContextInput(node_); }
Node* left() { return NodeProperties::GetValueInput(node_, 0); }
Node* right() { return NodeProperties::GetValueInput(node_, 1); }
Type* left_type() { return NodeProperties::GetType(node_->InputAt(0)); }
Type* right_type() { return NodeProperties::GetType(node_->InputAt(1)); }
Type* type() { return NodeProperties::GetType(node_); }
SimplifiedOperatorBuilder* simplified() { return lowering_->simplified(); }
Graph* graph() const { return lowering_->graph(); }
JSGraph* jsgraph() { return lowering_->jsgraph(); }
JSOperatorBuilder* javascript() { return lowering_->javascript(); }
CommonOperatorBuilder* common() { return jsgraph()->common(); }
Zone* zone() const { return graph()->zone(); }
private:
JSTypedLowering* lowering_; // The containing lowering instance.
Node* node_; // The original node.
Node* ConvertPlainPrimitiveToNumber(Node* node) {
DCHECK(NodeProperties::GetType(node)->Is(Type::PlainPrimitive()));
// Avoid inserting too many eager ToNumber() operations.
Reduction const reduction = lowering_->ReduceJSToNumberInput(node);
if (reduction.Changed()) return reduction.replacement();
if (NodeProperties::GetType(node)->Is(Type::Number())) {
return node;
}
return graph()->NewNode(simplified()->PlainPrimitiveToNumber(), node);
}
Node* ConvertToUI32(Node* node, Signedness signedness) {
// Avoid introducing too many eager NumberToXXnt32() operations.
Type* type = NodeProperties::GetType(node);
if (signedness == kSigned) {
if (!type->Is(Type::Signed32())) {
node = graph()->NewNode(simplified()->NumberToInt32(), node);
}
} else {
DCHECK_EQ(kUnsigned, signedness);
if (!type->Is(Type::Unsigned32())) {
node = graph()->NewNode(simplified()->NumberToUint32(), node);
}
}
return node;
}
void update_effect(Node* effect) {
NodeProperties::ReplaceEffectInput(node_, effect);
}
};
// TODO(turbofan): js-typed-lowering improvements possible
// - immediately put in type bounds for all new nodes
// - relax effects from generic but not-side-effecting operations
JSTypedLowering::JSTypedLowering(Editor* editor,
JSGraph* jsgraph, Zone* zone)
: AdvancedReducer(editor),
jsgraph_(jsgraph),
empty_string_type_(
Type::HeapConstant(factory()->empty_string(), graph()->zone())),
pointer_comparable_type_(
Type::Union(Type::Oddball(),
Type::Union(Type::SymbolOrReceiver(), empty_string_type_,
graph()->zone()),
graph()->zone())),
type_cache_(TypeCache::Get()) {}
Reduction JSTypedLowering::ReduceSpeculativeNumberAdd(Node* node) {
JSBinopReduction r(this, node);
NumberOperationHint hint = NumberOperationHintOf(node->op());
if ((hint == NumberOperationHint::kNumber ||
hint == NumberOperationHint::kNumberOrOddball) &&
r.BothInputsAre(Type::PlainPrimitive()) &&
r.NeitherInputCanBe(Type::StringOrReceiver())) {
// SpeculativeNumberAdd(x:-string, y:-string) =>
// NumberAdd(ToNumber(x), ToNumber(y))
r.ConvertInputsToNumber();
return r.ChangeToPureOperator(simplified()->NumberAdd(), Type::Number());
}
return NoChange();
}
Reduction JSTypedLowering::ReduceJSAdd(Node* node) {
JSBinopReduction r(this, node);
if (r.BothInputsAre(Type::Number())) {
// JSAdd(x:number, y:number) => NumberAdd(x, y)
r.ConvertInputsToNumber();
return r.ChangeToPureOperator(simplified()->NumberAdd(), Type::Number());
}
if (r.BothInputsAre(Type::PlainPrimitive()) &&
r.NeitherInputCanBe(Type::StringOrReceiver())) {
// JSAdd(x:-string, y:-string) => NumberAdd(ToNumber(x), ToNumber(y))
r.ConvertInputsToNumber();
return r.ChangeToPureOperator(simplified()->NumberAdd(), Type::Number());
}
if (r.OneInputIs(Type::String())) {
// We know that (at least) one input is already a String,
// so try to strength-reduce the non-String input.
if (r.LeftInputIs(Type::String())) {
Reduction const reduction = ReduceJSToStringInput(r.right());
if (reduction.Changed()) {
NodeProperties::ReplaceValueInput(node, reduction.replacement(), 1);
}
} else if (r.RightInputIs(Type::String())) {
Reduction const reduction = ReduceJSToStringInput(r.left());
if (reduction.Changed()) {
NodeProperties::ReplaceValueInput(node, reduction.replacement(), 0);
}
}
// We might be able to constant-fold the String concatenation now.
if (r.BothInputsAre(Type::String())) {
HeapObjectBinopMatcher m(node);
if (m.IsFoldable()) {
Handle<String> left = Handle<String>::cast(m.left().Value());
Handle<String> right = Handle<String>::cast(m.right().Value());
if (left->length() + right->length() > String::kMaxLength) {
// No point in trying to optimize this, as it will just throw.
return NoChange();
}
Node* value = jsgraph()->HeapConstant(
factory()->NewConsString(left, right).ToHandleChecked());
ReplaceWithValue(node, value);
return Replace(value);
}
}
// We might know for sure that we're creating a ConsString here.
if (r.ShouldCreateConsString()) {
return ReduceCreateConsString(node);
}
// Eliminate useless concatenation of empty string.
if (BinaryOperationHintOf(node->op()) == BinaryOperationHint::kString) {
Node* effect = NodeProperties::GetEffectInput(node);
Node* control = NodeProperties::GetControlInput(node);
if (r.LeftInputIs(empty_string_type_)) {
Node* value = effect = graph()->NewNode(simplified()->CheckString(),
r.right(), effect, control);
ReplaceWithValue(node, value, effect, control);
return Replace(value);
} else if (r.RightInputIs(empty_string_type_)) {
Node* value = effect = graph()->NewNode(simplified()->CheckString(),
r.left(), effect, control);
ReplaceWithValue(node, value, effect, control);
return Replace(value);
}
}
StringAddFlags flags = STRING_ADD_CHECK_NONE;
if (!r.LeftInputIs(Type::String())) {
flags = STRING_ADD_CONVERT_LEFT;
} else if (!r.RightInputIs(Type::String())) {
flags = STRING_ADD_CONVERT_RIGHT;
}
Operator::Properties properties = node->op()->properties();
if (r.NeitherInputCanBe(Type::Receiver())) {
// Both sides are already strings, so we know that the
// string addition will not cause any observable side
// effects; it can still throw obviously.
properties = Operator::kNoWrite | Operator::kNoDeopt;
}
// JSAdd(x:string, y) => CallStub[StringAdd](x, y)
// JSAdd(x, y:string) => CallStub[StringAdd](x, y)
Callable const callable =
CodeFactory::StringAdd(isolate(), flags, NOT_TENURED);
CallDescriptor const* const desc = Linkage::GetStubCallDescriptor(
isolate(), graph()->zone(), callable.descriptor(), 0,
CallDescriptor::kNeedsFrameState, properties);
DCHECK_EQ(1, OperatorProperties::GetFrameStateInputCount(node->op()));
node->InsertInput(graph()->zone(), 0,
jsgraph()->HeapConstant(callable.code()));
NodeProperties::ChangeOp(node, common()->Call(desc));
return Changed(node);
}
return NoChange();
}
Reduction JSTypedLowering::ReduceNumberBinop(Node* node) {
JSBinopReduction r(this, node);
if (r.BothInputsAre(Type::PlainPrimitive())) {
r.ConvertInputsToNumber();
return r.ChangeToPureOperator(r.NumberOp(), Type::Number());
}
return NoChange();
}
Reduction JSTypedLowering::ReduceSpeculativeNumberBinop(Node* node) {
JSBinopReduction r(this, node);
NumberOperationHint hint = NumberOperationHintOf(node->op());
if ((hint == NumberOperationHint::kNumber ||
hint == NumberOperationHint::kNumberOrOddball) &&
r.BothInputsAre(Type::NumberOrUndefinedOrNullOrBoolean())) {
r.ConvertInputsToNumber();
return r.ChangeToPureOperator(r.NumberOpFromSpeculativeNumberOp(),
Type::Number());
}
return NoChange();
}
Reduction JSTypedLowering::ReduceInt32Binop(Node* node) {
JSBinopReduction r(this, node);
if (r.BothInputsAre(Type::PlainPrimitive())) {
r.ConvertInputsToNumber();
r.ConvertInputsToUI32(kSigned, kSigned);
return r.ChangeToPureOperator(r.NumberOp(), Type::Signed32());
}
return NoChange();
}
Reduction JSTypedLowering::ReduceUI32Shift(Node* node, Signedness signedness) {
JSBinopReduction r(this, node);
if (r.BothInputsAre(Type::PlainPrimitive())) {
r.ConvertInputsToNumber();
r.ConvertInputsToUI32(signedness, kUnsigned);
return r.ChangeToPureOperator(r.NumberOp(), signedness == kUnsigned
? Type::Unsigned32()
: Type::Signed32());
}
return NoChange();
}
Reduction JSTypedLowering::ReduceCreateConsString(Node* node) {
Node* first = NodeProperties::GetValueInput(node, 0);
Node* second = NodeProperties::GetValueInput(node, 1);
Node* context = NodeProperties::GetContextInput(node);
Node* frame_state = NodeProperties::GetFrameStateInput(node);
Node* effect = NodeProperties::GetEffectInput(node);
Node* control = NodeProperties::GetControlInput(node);
// Make sure {first} is actually a String.
Type* first_type = NodeProperties::GetType(first);
if (!first_type->Is(Type::String())) {
first = effect =
graph()->NewNode(simplified()->CheckString(), first, effect, control);
first_type = NodeProperties::GetType(first);
}
// Make sure {second} is actually a String.
Type* second_type = NodeProperties::GetType(second);
if (!second_type->Is(Type::String())) {
second = effect =
graph()->NewNode(simplified()->CheckString(), second, effect, control);
second_type = NodeProperties::GetType(second);
}
// Determine the {first} length.
Node* first_length = BuildGetStringLength(first, &effect, control);
Node* second_length = BuildGetStringLength(second, &effect, control);
// Compute the resulting length.
Node* length =
graph()->NewNode(simplified()->NumberAdd(), first_length, second_length);
if (isolate()->IsStringLengthOverflowIntact()) {
// We can just deoptimize if the {length} is out-of-bounds. Besides
// generating a shorter code sequence than the version below, this
// has the additional benefit of not holding on to the lazy {frame_state}
// and thus potentially reduces the number of live ranges and allows for
// more truncations.
length = effect = graph()->NewNode(simplified()->CheckBounds(), length,
jsgraph()->Constant(String::kMaxLength),
effect, control);
} else {
// Check if we would overflow the allowed maximum string length.
Node* check =
graph()->NewNode(simplified()->NumberLessThanOrEqual(), length,
jsgraph()->Constant(String::kMaxLength));
Node* branch =
graph()->NewNode(common()->Branch(BranchHint::kTrue), check, control);
Node* if_false = graph()->NewNode(common()->IfFalse(), branch);
Node* efalse = effect;
{
// Throw a RangeError in case of overflow.
Node* vfalse = efalse = if_false = graph()->NewNode(
javascript()->CallRuntime(Runtime::kThrowInvalidStringLength),
context, frame_state, efalse, if_false);
// Update potential {IfException} uses of {node} to point to the
// %ThrowInvalidStringLength runtime call node instead.
Node* on_exception = nullptr;
if (NodeProperties::IsExceptionalCall(node, &on_exception)) {
NodeProperties::ReplaceControlInput(on_exception, vfalse);
NodeProperties::ReplaceEffectInput(on_exception, efalse);
if_false = graph()->NewNode(common()->IfSuccess(), vfalse);
Revisit(on_exception);
}
// The above %ThrowInvalidStringLength runtime call is an unconditional
// throw, making it impossible to return a successful completion in this
// case. We simply connect the successful completion to the graph end.
if_false = graph()->NewNode(common()->Throw(), efalse, if_false);
// TODO(bmeurer): This should be on the AdvancedReducer somehow.
NodeProperties::MergeControlToEnd(graph(), common(), if_false);
Revisit(graph()->end());
}
control = graph()->NewNode(common()->IfTrue(), branch);
}
// Figure out the map for the resulting ConsString.
// TODO(turbofan): We currently just use the cons_string_map here for
// the sake of simplicity; we could also try to be smarter here and
// use the one_byte_cons_string_map instead when the resulting ConsString
// contains only one byte characters.
Node* value_map = jsgraph()->HeapConstant(factory()->cons_string_map());
// Allocate the resulting ConsString.
AllocationBuilder a(jsgraph(), effect, control);
a.Allocate(ConsString::kSize, NOT_TENURED, Type::OtherString());
a.Store(AccessBuilder::ForMap(), value_map);
a.Store(AccessBuilder::ForNameHashField(),
jsgraph()->Constant(Name::kEmptyHashField));
a.Store(AccessBuilder::ForStringLength(), length);
a.Store(AccessBuilder::ForConsStringFirst(), first);
a.Store(AccessBuilder::ForConsStringSecond(), second);
// Morph the {node} into a {FinishRegion}.
ReplaceWithValue(node, node, node, control);
a.FinishAndChange(node);
return Changed(node);
}
Node* JSTypedLowering::BuildGetStringLength(Node* value, Node** effect,
Node* control) {
HeapObjectMatcher m(value);
Node* length =
(m.HasValue() && m.Value()->IsString())
? jsgraph()->Constant(Handle<String>::cast(m.Value())->length())
: (*effect) = graph()->NewNode(
simplified()->LoadField(AccessBuilder::ForStringLength()),
value, *effect, control);
return length;
}
Reduction JSTypedLowering::ReduceSpeculativeNumberComparison(Node* node) {
JSBinopReduction r(this, node);
if (r.BothInputsAre(Type::Signed32()) ||
r.BothInputsAre(Type::Unsigned32())) {
return r.ChangeToPureOperator(r.NumberOpFromSpeculativeNumberOp());
}
return NoChange();
}
Reduction JSTypedLowering::ReduceJSComparison(Node* node) {
JSBinopReduction r(this, node);
if (r.BothInputsAre(Type::String())) {
// If both inputs are definitely strings, perform a string comparison.
const Operator* stringOp;
switch (node->opcode()) {
case IrOpcode::kJSLessThan:
stringOp = simplified()->StringLessThan();
break;
case IrOpcode::kJSGreaterThan:
stringOp = simplified()->StringLessThan();
r.SwapInputs(); // a > b => b < a
break;
case IrOpcode::kJSLessThanOrEqual:
stringOp = simplified()->StringLessThanOrEqual();
break;
case IrOpcode::kJSGreaterThanOrEqual:
stringOp = simplified()->StringLessThanOrEqual();
r.SwapInputs(); // a >= b => b <= a
break;
default:
return NoChange();
}
r.ChangeToPureOperator(stringOp);
return Changed(node);
}
const Operator* less_than;
const Operator* less_than_or_equal;
if (r.BothInputsAre(Type::Signed32()) ||
r.BothInputsAre(Type::Unsigned32())) {
less_than = simplified()->NumberLessThan();
less_than_or_equal = simplified()->NumberLessThanOrEqual();
} else if (r.OneInputCannotBe(Type::StringOrReceiver()) &&
r.BothInputsAre(Type::PlainPrimitive())) {
r.ConvertInputsToNumber();
less_than = simplified()->NumberLessThan();
less_than_or_equal = simplified()->NumberLessThanOrEqual();
} else if (r.IsStringCompareOperation()) {
r.CheckInputsToString();
less_than = simplified()->StringLessThan();
less_than_or_equal = simplified()->StringLessThanOrEqual();
} else {
return NoChange();
}
const Operator* comparison;
switch (node->opcode()) {
case IrOpcode::kJSLessThan:
comparison = less_than;
break;
case IrOpcode::kJSGreaterThan:
comparison = less_than;
r.SwapInputs(); // a > b => b < a
break;
case IrOpcode::kJSLessThanOrEqual:
comparison = less_than_or_equal;
break;
case IrOpcode::kJSGreaterThanOrEqual:
comparison = less_than_or_equal;
r.SwapInputs(); // a >= b => b <= a
break;
default:
return NoChange();
}
return r.ChangeToPureOperator(comparison);
}
Reduction JSTypedLowering::ReduceJSEqual(Node* node) {
JSBinopReduction r(this, node);
if (r.BothInputsAre(Type::UniqueName())) {
return r.ChangeToPureOperator(simplified()->ReferenceEqual());
}
if (r.IsInternalizedStringCompareOperation()) {
r.CheckInputsToInternalizedString();
return r.ChangeToPureOperator(simplified()->ReferenceEqual());
}
if (r.BothInputsAre(Type::String())) {
return r.ChangeToPureOperator(simplified()->StringEqual());
}
if (r.BothInputsAre(Type::Boolean())) {
return r.ChangeToPureOperator(simplified()->ReferenceEqual());
}
if (r.BothInputsAre(Type::Receiver())) {
return r.ChangeToPureOperator(simplified()->ReferenceEqual());
}
if (r.OneInputIs(Type::Undetectable())) {
RelaxEffectsAndControls(node);
node->RemoveInput(r.LeftInputIs(Type::Undetectable()) ? 0 : 1);
node->TrimInputCount(1);
NodeProperties::ChangeOp(node, simplified()->ObjectIsUndetectable());
return Changed(node);
}
if (r.BothInputsAre(Type::Signed32()) ||
r.BothInputsAre(Type::Unsigned32())) {
return r.ChangeToPureOperator(simplified()->NumberEqual());
} else if (r.BothInputsAre(Type::Number())) {
return r.ChangeToPureOperator(simplified()->NumberEqual());
} else if (r.IsReceiverCompareOperation()) {
r.CheckInputsToReceiver();
return r.ChangeToPureOperator(simplified()->ReferenceEqual());
} else if (r.IsStringCompareOperation()) {
r.CheckInputsToString();
return r.ChangeToPureOperator(simplified()->StringEqual());
} else if (r.IsSymbolCompareOperation()) {
r.CheckInputsToSymbol();
return r.ChangeToPureOperator(simplified()->ReferenceEqual());
}
return NoChange();
}
Reduction JSTypedLowering::ReduceJSStrictEqual(Node* node) {
JSBinopReduction r(this, node);
if (r.left() == r.right()) {
// x === x is always true if x != NaN
Node* replacement = graph()->NewNode(
simplified()->BooleanNot(),
graph()->NewNode(simplified()->ObjectIsNaN(), r.left()));
ReplaceWithValue(node, replacement);
return Replace(replacement);
}
if (r.OneInputCannotBe(Type::NumberOrString())) {
// For values with canonical representation (i.e. neither String, nor
// Number) an empty type intersection means the values cannot be strictly
// equal.
if (!r.left_type()->Maybe(r.right_type())) {
Node* replacement = jsgraph()->FalseConstant();
ReplaceWithValue(node, replacement);
return Replace(replacement);
}
}
if (r.BothInputsAre(Type::Unique())) {
return r.ChangeToPureOperator(simplified()->ReferenceEqual());
}
if (r.OneInputIs(pointer_comparable_type_)) {
return r.ChangeToPureOperator(simplified()->ReferenceEqual());
}
if (r.IsInternalizedStringCompareOperation()) {
r.CheckInputsToInternalizedString();
return r.ChangeToPureOperator(simplified()->ReferenceEqual());
}
if (r.BothInputsAre(Type::String())) {
return r.ChangeToPureOperator(simplified()->StringEqual());
}
NumberOperationHint hint;
if (r.BothInputsAre(Type::Signed32()) ||
r.BothInputsAre(Type::Unsigned32())) {
return r.ChangeToPureOperator(simplified()->NumberEqual());
} else if (r.GetCompareNumberOperationHint(&hint)) {
return r.ChangeToSpeculativeOperator(
simplified()->SpeculativeNumberEqual(hint), Type::Boolean());
} else if (r.BothInputsAre(Type::Number())) {
return r.ChangeToPureOperator(simplified()->NumberEqual());
} else if (r.IsReceiverCompareOperation()) {
// For strict equality, it's enough to know that one input is a Receiver,
// as a strict equality comparison with a Receiver can only yield true if
// both sides refer to the same Receiver than.
r.CheckLeftInputToReceiver();
return r.ChangeToPureOperator(simplified()->ReferenceEqual());
} else if (r.IsStringCompareOperation()) {
r.CheckInputsToString();
return r.ChangeToPureOperator(simplified()->StringEqual());
} else if (r.IsSymbolCompareOperation()) {
r.CheckInputsToSymbol();
return r.ChangeToPureOperator(simplified()->ReferenceEqual());
}
return NoChange();
}
Reduction JSTypedLowering::ReduceJSToBoolean(Node* node) {
Node* const input = node->InputAt(0);
Type* const input_type = NodeProperties::GetType(input);
if (input_type->Is(Type::Boolean())) {
// JSToBoolean(x:boolean) => x
return Replace(input);
} else if (input_type->Is(Type::OrderedNumber())) {
// JSToBoolean(x:ordered-number) => BooleanNot(NumberEqual(x,#0))
node->ReplaceInput(0, graph()->NewNode(simplified()->NumberEqual(), input,
jsgraph()->ZeroConstant()));
node->TrimInputCount(1);
NodeProperties::ChangeOp(node, simplified()->BooleanNot());
return Changed(node);
} else if (input_type->Is(Type::Number())) {
// JSToBoolean(x:number) => NumberToBoolean(x)
node->TrimInputCount(1);
NodeProperties::ChangeOp(node, simplified()->NumberToBoolean());
return Changed(node);
} else if (input_type->Is(Type::DetectableReceiverOrNull())) {
// JSToBoolean(x:detectable receiver \/ null)
// => BooleanNot(ReferenceEqual(x,#null))
node->ReplaceInput(0, graph()->NewNode(simplified()->ReferenceEqual(),
input, jsgraph()->NullConstant()));
node->TrimInputCount(1);
NodeProperties::ChangeOp(node, simplified()->BooleanNot());
return Changed(node);
} else if (input_type->Is(Type::ReceiverOrNullOrUndefined())) {
// JSToBoolean(x:receiver \/ null \/ undefined)
// => BooleanNot(ObjectIsUndetectable(x))
node->ReplaceInput(
0, graph()->NewNode(simplified()->ObjectIsUndetectable(), input));
node->TrimInputCount(1);
NodeProperties::ChangeOp(node, simplified()->BooleanNot());
return Changed(node);
} else if (input_type->Is(Type::String())) {
// JSToBoolean(x:string) => BooleanNot(ReferenceEqual(x,""))
node->ReplaceInput(0,
graph()->NewNode(simplified()->ReferenceEqual(), input,
jsgraph()->EmptyStringConstant()));
node->TrimInputCount(1);
NodeProperties::ChangeOp(node, simplified()->BooleanNot());
return Changed(node);
}
return NoChange();
}
Reduction JSTypedLowering::ReduceJSToInteger(Node* node) {
Node* const input = NodeProperties::GetValueInput(node, 0);
Type* const input_type = NodeProperties::GetType(input);
if (input_type->Is(type_cache_.kIntegerOrMinusZero)) {
// JSToInteger(x:integer) => x
ReplaceWithValue(node, input);
return Replace(input);
}
return NoChange();
}
Reduction JSTypedLowering::ReduceJSToName(Node* node) {
Node* const input = NodeProperties::GetValueInput(node, 0);
Type* const input_type = NodeProperties::GetType(input);
if (input_type->Is(Type::Name())) {
// JSToName(x:name) => x
ReplaceWithValue(node, input);
return Replace(input);
}
return NoChange();
}
Reduction JSTypedLowering::ReduceJSToLength(Node* node) {
Node* input = NodeProperties::GetValueInput(node, 0);
Type* input_type = NodeProperties::GetType(input);
if (input_type->Is(type_cache_.kIntegerOrMinusZero)) {
if (input_type->Max() <= 0.0) {
input = jsgraph()->ZeroConstant();
} else if (input_type->Min() >= kMaxSafeInteger) {
input = jsgraph()->Constant(kMaxSafeInteger);
} else {
if (input_type->Min() <= 0.0) {
input = graph()->NewNode(simplified()->NumberMax(),
jsgraph()->ZeroConstant(), input);
}
if (input_type->Max() > kMaxSafeInteger) {
input = graph()->NewNode(simplified()->NumberMin(),
jsgraph()->Constant(kMaxSafeInteger), input);
}
}
ReplaceWithValue(node, input);
return Replace(input);
}
return NoChange();
}
Reduction JSTypedLowering::ReduceJSToNumberInput(Node* input) {
// Try constant-folding of JSToNumber with constant inputs.
Type* input_type = NodeProperties::GetType(input);
if (input_type->Is(Type::String())) {
HeapObjectMatcher m(input);
if (m.HasValue() && m.Value()->IsString()) {
Handle<Object> input_value = m.Value();
return Replace(jsgraph()->Constant(
String::ToNumber(Handle<String>::cast(input_value))));
}
}
if (input_type->IsHeapConstant()) {
Handle<Object> input_value = input_type->AsHeapConstant()->Value();
if (input_value->IsOddball()) {
return Replace(jsgraph()->Constant(
Oddball::ToNumber(Handle<Oddball>::cast(input_value))));
}
}
if (input_type->Is(Type::Number())) {
// JSToNumber(x:number) => x
return Changed(input);
}
if (input_type->Is(Type::Undefined())) {
// JSToNumber(undefined) => #NaN
return Replace(jsgraph()->NaNConstant());
}
if (input_type->Is(Type::Null())) {
// JSToNumber(null) => #0
return Replace(jsgraph()->ZeroConstant());
}
return NoChange();
}
Reduction JSTypedLowering::ReduceJSToNumber(Node* node) {
// Try to reduce the input first.
Node* const input = node->InputAt(0);
Reduction reduction = ReduceJSToNumberInput(input);
if (reduction.Changed()) {
ReplaceWithValue(node, reduction.replacement());
return reduction;
}
Type* const input_type = NodeProperties::GetType(input);
if (input_type->Is(Type::PlainPrimitive())) {
RelaxEffectsAndControls(node);
node->TrimInputCount(1);
NodeProperties::ChangeOp(node, simplified()->PlainPrimitiveToNumber());
return Changed(node);
}
return NoChange();
}