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representation-change.cc
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representation-change.cc
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// Copyright 2015 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/representation-change.h"
#include <sstream>
#include "src/base/bits.h"
#include "src/codegen/code-factory.h"
#include "src/compiler/js-heap-broker.h"
#include "src/compiler/machine-operator.h"
#include "src/compiler/node-matchers.h"
#include "src/compiler/simplified-operator.h"
#include "src/compiler/type-cache.h"
#include "src/heap/factory-inl.h"
namespace v8 {
namespace internal {
namespace compiler {
const char* Truncation::description() const {
switch (kind()) {
case TruncationKind::kNone:
return "no-value-use";
case TruncationKind::kBool:
return "truncate-to-bool";
case TruncationKind::kWord32:
return "truncate-to-word32";
case TruncationKind::kWord64:
return "truncate-to-word64";
case TruncationKind::kOddballAndBigIntToNumber:
switch (identify_zeros()) {
case kIdentifyZeros:
return "truncate-oddball&bigint-to-number (identify zeros)";
case kDistinguishZeros:
return "truncate-oddball&bigint-to-number (distinguish zeros)";
}
case TruncationKind::kAny:
switch (identify_zeros()) {
case kIdentifyZeros:
return "no-truncation (but identify zeros)";
case kDistinguishZeros:
return "no-truncation (but distinguish zeros)";
}
}
UNREACHABLE();
}
// Partial order for truncations:
//
// kAny <-------+
// ^ |
// | |
// kOddballAndBigIntToNumber |
// ^ |
// / |
// kWord64 |
// ^ |
// | |
// kWord32 kBool
// ^ ^
// \ /
// \ /
// \ /
// \ /
// \ /
// kNone
//
// TODO(jarin) We might consider making kBool < kOddballAndBigIntToNumber.
// static
Truncation::TruncationKind Truncation::Generalize(TruncationKind rep1,
TruncationKind rep2) {
if (LessGeneral(rep1, rep2)) return rep2;
if (LessGeneral(rep2, rep1)) return rep1;
// Handle the generalization of float64-representable values.
if (LessGeneral(rep1, TruncationKind::kOddballAndBigIntToNumber) &&
LessGeneral(rep2, TruncationKind::kOddballAndBigIntToNumber)) {
return TruncationKind::kOddballAndBigIntToNumber;
}
// Handle the generalization of any-representable values.
if (LessGeneral(rep1, TruncationKind::kAny) &&
LessGeneral(rep2, TruncationKind::kAny)) {
return TruncationKind::kAny;
}
// All other combinations are illegal.
FATAL("Tried to combine incompatible truncations");
return TruncationKind::kNone;
}
// static
IdentifyZeros Truncation::GeneralizeIdentifyZeros(IdentifyZeros i1,
IdentifyZeros i2) {
if (i1 == i2) {
return i1;
} else {
return kDistinguishZeros;
}
}
// static
bool Truncation::LessGeneral(TruncationKind rep1, TruncationKind rep2) {
switch (rep1) {
case TruncationKind::kNone:
return true;
case TruncationKind::kBool:
return rep2 == TruncationKind::kBool || rep2 == TruncationKind::kAny;
case TruncationKind::kWord32:
return rep2 == TruncationKind::kWord32 ||
rep2 == TruncationKind::kWord64 ||
rep2 == TruncationKind::kOddballAndBigIntToNumber ||
rep2 == TruncationKind::kAny;
case TruncationKind::kWord64:
return rep2 == TruncationKind::kWord64 ||
rep2 == TruncationKind::kOddballAndBigIntToNumber ||
rep2 == TruncationKind::kAny;
case TruncationKind::kOddballAndBigIntToNumber:
return rep2 == TruncationKind::kOddballAndBigIntToNumber ||
rep2 == TruncationKind::kAny;
case TruncationKind::kAny:
return rep2 == TruncationKind::kAny;
}
UNREACHABLE();
}
// static
bool Truncation::LessGeneralIdentifyZeros(IdentifyZeros i1, IdentifyZeros i2) {
return i1 == i2 || i1 == kIdentifyZeros;
}
namespace {
bool IsWord(MachineRepresentation rep) {
return rep == MachineRepresentation::kWord8 ||
rep == MachineRepresentation::kWord16 ||
rep == MachineRepresentation::kWord32;
}
} // namespace
RepresentationChanger::RepresentationChanger(JSGraph* jsgraph,
JSHeapBroker* broker)
: cache_(TypeCache::Get()),
jsgraph_(jsgraph),
broker_(broker),
testing_type_errors_(false),
type_error_(false) {}
// Changes representation from {output_rep} to {use_rep}. The {truncation}
// parameter is only used for checking - if the changer cannot figure
// out signedness for the word32->float64 conversion, then we check that the
// uses truncate to word32 (so they do not care about signedness).
Node* RepresentationChanger::GetRepresentationFor(
Node* node, MachineRepresentation output_rep, Type output_type,
Node* use_node, UseInfo use_info) {
if (output_rep == MachineRepresentation::kNone && !output_type.IsNone()) {
// The output representation should be set if the type is inhabited (i.e.,
// if the value is possible).
return TypeError(node, output_rep, output_type, use_info.representation());
}
// Rematerialize any truncated BigInt if user is not expecting a BigInt.
if (output_type.Is(Type::BigInt()) &&
output_rep == MachineRepresentation::kWord64 &&
use_info.type_check() != TypeCheckKind::kBigInt) {
node =
InsertConversion(node, simplified()->ChangeUint64ToBigInt(), use_node);
output_rep = MachineRepresentation::kTaggedPointer;
}
// Handle the no-op shortcuts when no checking is necessary.
if (use_info.type_check() == TypeCheckKind::kNone ||
// TODO(nicohartmann@, chromium:1077804): Ignoring {use_info.type_check()}
// in case the representation already matches is not correct. For now,
// this behavior is disabled only for TypeCheckKind::kBigInt, but should
// be fixed for all other type checks.
(output_rep != MachineRepresentation::kWord32 &&
use_info.type_check() != TypeCheckKind::kBigInt)) {
if (use_info.representation() == output_rep) {
// Representations are the same. That's a no-op.
return node;
}
if (IsWord(use_info.representation()) && IsWord(output_rep)) {
// Both are words less than or equal to 32-bits.
// Since loads of integers from memory implicitly sign or zero extend the
// value to the full machine word size and stores implicitly truncate,
// no representation change is necessary.
return node;
}
}
switch (use_info.representation()) {
case MachineRepresentation::kTaggedSigned:
DCHECK(use_info.type_check() == TypeCheckKind::kNone ||
use_info.type_check() == TypeCheckKind::kSignedSmall);
return GetTaggedSignedRepresentationFor(node, output_rep, output_type,
use_node, use_info);
case MachineRepresentation::kTaggedPointer:
DCHECK(use_info.type_check() == TypeCheckKind::kNone ||
use_info.type_check() == TypeCheckKind::kHeapObject ||
use_info.type_check() == TypeCheckKind::kBigInt);
return GetTaggedPointerRepresentationFor(node, output_rep, output_type,
use_node, use_info);
case MachineRepresentation::kTagged:
DCHECK_EQ(TypeCheckKind::kNone, use_info.type_check());
return GetTaggedRepresentationFor(node, output_rep, output_type,
use_info.truncation());
case MachineRepresentation::kFloat32:
DCHECK_EQ(TypeCheckKind::kNone, use_info.type_check());
return GetFloat32RepresentationFor(node, output_rep, output_type,
use_info.truncation());
case MachineRepresentation::kFloat64:
DCHECK(use_info.type_check() == TypeCheckKind::kNone ||
use_info.type_check() == TypeCheckKind::kNumber ||
use_info.type_check() == TypeCheckKind::kNumberOrBoolean ||
use_info.type_check() == TypeCheckKind::kNumberOrOddball);
return GetFloat64RepresentationFor(node, output_rep, output_type,
use_node, use_info);
case MachineRepresentation::kBit:
DCHECK_EQ(TypeCheckKind::kNone, use_info.type_check());
return GetBitRepresentationFor(node, output_rep, output_type);
case MachineRepresentation::kWord8:
case MachineRepresentation::kWord16:
case MachineRepresentation::kWord32:
return GetWord32RepresentationFor(node, output_rep, output_type, use_node,
use_info);
case MachineRepresentation::kWord64:
DCHECK(use_info.type_check() == TypeCheckKind::kNone ||
use_info.type_check() == TypeCheckKind::kSigned64 ||
use_info.type_check() == TypeCheckKind::kBigInt ||
use_info.type_check() == TypeCheckKind::kArrayIndex);
return GetWord64RepresentationFor(node, output_rep, output_type, use_node,
use_info);
case MachineRepresentation::kSimd128:
case MachineRepresentation::kNone:
return node;
case MachineRepresentation::kCompressed:
case MachineRepresentation::kCompressedPointer:
UNREACHABLE();
}
UNREACHABLE();
}
Node* RepresentationChanger::GetTaggedSignedRepresentationFor(
Node* node, MachineRepresentation output_rep, Type output_type,
Node* use_node, UseInfo use_info) {
// Eagerly fold representation changes for constants.
switch (node->opcode()) {
case IrOpcode::kNumberConstant:
if (output_type.Is(Type::SignedSmall())) {
return node;
}
break;
default:
break;
}
// Select the correct X -> Tagged operator.
const Operator* op;
if (output_type.Is(Type::None())) {
// This is an impossible value; it should not be used at runtime.
return jsgraph()->graph()->NewNode(
jsgraph()->common()->DeadValue(MachineRepresentation::kTaggedSigned),
node);
} else if (IsWord(output_rep)) {
if (output_type.Is(Type::Signed31())) {
op = simplified()->ChangeInt31ToTaggedSigned();
} else if (output_type.Is(Type::Signed32())) {
if (SmiValuesAre32Bits()) {
op = simplified()->ChangeInt32ToTagged();
} else if (use_info.type_check() == TypeCheckKind::kSignedSmall) {
op = simplified()->CheckedInt32ToTaggedSigned(use_info.feedback());
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kTaggedSigned);
}
} else if (output_type.Is(Type::Unsigned32()) &&
use_info.type_check() == TypeCheckKind::kSignedSmall) {
op = simplified()->CheckedUint32ToTaggedSigned(use_info.feedback());
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kTaggedSigned);
}
} else if (output_rep == MachineRepresentation::kWord64) {
if (output_type.Is(Type::Signed31())) {
// int64 -> int32 -> tagged signed
node = InsertTruncateInt64ToInt32(node);
op = simplified()->ChangeInt31ToTaggedSigned();
} else if (output_type.Is(Type::Signed32()) && SmiValuesAre32Bits()) {
// int64 -> int32 -> tagged signed
node = InsertTruncateInt64ToInt32(node);
op = simplified()->ChangeInt32ToTagged();
} else if (use_info.type_check() == TypeCheckKind::kSignedSmall) {
if (output_type.Is(cache_->kPositiveSafeInteger)) {
op = simplified()->CheckedUint64ToTaggedSigned(use_info.feedback());
} else if (output_type.Is(cache_->kSafeInteger)) {
op = simplified()->CheckedInt64ToTaggedSigned(use_info.feedback());
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kTaggedSigned);
}
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kTaggedSigned);
}
} else if (output_rep == MachineRepresentation::kFloat64) {
if (output_type.Is(Type::Signed31())) {
// float64 -> int32 -> tagged signed
node = InsertChangeFloat64ToInt32(node);
op = simplified()->ChangeInt31ToTaggedSigned();
} else if (output_type.Is(Type::Signed32())) {
// float64 -> int32 -> tagged signed
node = InsertChangeFloat64ToInt32(node);
if (SmiValuesAre32Bits()) {
op = simplified()->ChangeInt32ToTagged();
} else if (use_info.type_check() == TypeCheckKind::kSignedSmall) {
op = simplified()->CheckedInt32ToTaggedSigned(use_info.feedback());
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kTaggedSigned);
}
} else if (output_type.Is(Type::Unsigned32()) &&
use_info.type_check() == TypeCheckKind::kSignedSmall) {
// float64 -> uint32 -> tagged signed
node = InsertChangeFloat64ToUint32(node);
op = simplified()->CheckedUint32ToTaggedSigned(use_info.feedback());
} else if (use_info.type_check() == TypeCheckKind::kSignedSmall) {
node = InsertCheckedFloat64ToInt32(
node,
output_type.Maybe(Type::MinusZero())
? CheckForMinusZeroMode::kCheckForMinusZero
: CheckForMinusZeroMode::kDontCheckForMinusZero,
use_info.feedback(), use_node);
if (SmiValuesAre32Bits()) {
op = simplified()->ChangeInt32ToTagged();
} else {
op = simplified()->CheckedInt32ToTaggedSigned(use_info.feedback());
}
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kTaggedSigned);
}
} else if (output_rep == MachineRepresentation::kFloat32) {
if (use_info.type_check() == TypeCheckKind::kSignedSmall) {
node = InsertChangeFloat32ToFloat64(node);
node = InsertCheckedFloat64ToInt32(
node,
output_type.Maybe(Type::MinusZero())
? CheckForMinusZeroMode::kCheckForMinusZero
: CheckForMinusZeroMode::kDontCheckForMinusZero,
use_info.feedback(), use_node);
if (SmiValuesAre32Bits()) {
op = simplified()->ChangeInt32ToTagged();
} else {
op = simplified()->CheckedInt32ToTaggedSigned(use_info.feedback());
}
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kTaggedSigned);
}
} else if (CanBeTaggedPointer(output_rep)) {
if (use_info.type_check() == TypeCheckKind::kSignedSmall) {
op = simplified()->CheckedTaggedToTaggedSigned(use_info.feedback());
} else if (output_type.Is(Type::SignedSmall())) {
op = simplified()->ChangeTaggedToTaggedSigned();
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kTaggedSigned);
}
} else if (output_rep == MachineRepresentation::kBit) {
if (use_info.type_check() == TypeCheckKind::kSignedSmall) {
// TODO(turbofan): Consider adding a Bailout operator that just deopts.
// Also use that for MachineRepresentation::kPointer case above.
node = InsertChangeBitToTagged(node);
op = simplified()->CheckedTaggedToTaggedSigned(use_info.feedback());
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kTaggedSigned);
}
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kTaggedSigned);
}
return InsertConversion(node, op, use_node);
}
Node* RepresentationChanger::GetTaggedPointerRepresentationFor(
Node* node, MachineRepresentation output_rep, Type output_type,
Node* use_node, UseInfo use_info) {
// Eagerly fold representation changes for constants.
switch (node->opcode()) {
case IrOpcode::kHeapConstant:
case IrOpcode::kDelayedStringConstant:
if (use_info.type_check() == TypeCheckKind::kBigInt) break;
return node; // No change necessary.
case IrOpcode::kInt32Constant:
case IrOpcode::kFloat64Constant:
case IrOpcode::kFloat32Constant:
UNREACHABLE();
default:
break;
}
// Select the correct X -> TaggedPointer operator.
Operator const* op;
if (output_type.Is(Type::None())) {
// This is an impossible value; it should not be used at runtime.
return jsgraph()->graph()->NewNode(
jsgraph()->common()->DeadValue(MachineRepresentation::kTaggedPointer),
node);
}
if (use_info.type_check() == TypeCheckKind::kBigInt &&
!output_type.Is(Type::BigInt())) {
// BigInt checks can only be performed on tagged representations. Note that
// a corresponding check is inserted down below.
if (!CanBeTaggedPointer(output_rep)) {
Node* unreachable =
InsertUnconditionalDeopt(use_node, DeoptimizeReason::kNotABigInt);
return jsgraph()->graph()->NewNode(
jsgraph()->common()->DeadValue(MachineRepresentation::kTaggedPointer),
unreachable);
}
}
if (output_rep == MachineRepresentation::kBit) {
if (output_type.Is(Type::Boolean())) {
op = simplified()->ChangeBitToTagged();
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kTagged);
}
} else if (IsWord(output_rep)) {
if (output_type.Is(Type::Unsigned32())) {
// uint32 -> float64 -> tagged
node = InsertChangeUint32ToFloat64(node);
} else if (output_type.Is(Type::Signed32())) {
// int32 -> float64 -> tagged
node = InsertChangeInt32ToFloat64(node);
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kTaggedPointer);
}
op = simplified()->ChangeFloat64ToTaggedPointer();
} else if (output_rep == MachineRepresentation::kWord64) {
if (output_type.Is(cache_->kSafeInteger)) {
// int64 -> float64 -> tagged pointer
op = machine()->ChangeInt64ToFloat64();
node = jsgraph()->graph()->NewNode(op, node);
op = simplified()->ChangeFloat64ToTaggedPointer();
} else if (output_type.Is(Type::BigInt()) &&
use_info.type_check() == TypeCheckKind::kBigInt) {
op = simplified()->ChangeUint64ToBigInt();
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kTaggedPointer);
}
} else if (output_rep == MachineRepresentation::kFloat32) {
if (output_type.Is(Type::Number())) {
// float32 -> float64 -> tagged
node = InsertChangeFloat32ToFloat64(node);
op = simplified()->ChangeFloat64ToTaggedPointer();
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kTaggedPointer);
}
} else if (output_rep == MachineRepresentation::kFloat64) {
if (output_type.Is(Type::Number())) {
// float64 -> tagged
op = simplified()->ChangeFloat64ToTaggedPointer();
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kTaggedPointer);
}
} else if (CanBeTaggedSigned(output_rep) &&
use_info.type_check() == TypeCheckKind::kHeapObject) {
if (!output_type.Maybe(Type::SignedSmall())) {
return node;
}
// TODO(turbofan): Consider adding a Bailout operator that just deopts
// for TaggedSigned output representation.
op = simplified()->CheckedTaggedToTaggedPointer(use_info.feedback());
} else if (IsAnyTagged(output_rep) &&
(use_info.type_check() == TypeCheckKind::kBigInt ||
output_type.Is(Type::BigInt()))) {
if (output_type.Is(Type::BigInt())) {
return node;
}
op = simplified()->CheckBigInt(use_info.feedback());
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kTaggedPointer);
}
return InsertConversion(node, op, use_node);
}
Node* RepresentationChanger::GetTaggedRepresentationFor(
Node* node, MachineRepresentation output_rep, Type output_type,
Truncation truncation) {
// Eagerly fold representation changes for constants.
switch (node->opcode()) {
case IrOpcode::kNumberConstant:
case IrOpcode::kHeapConstant:
case IrOpcode::kDelayedStringConstant:
return node; // No change necessary.
case IrOpcode::kInt32Constant:
case IrOpcode::kFloat64Constant:
case IrOpcode::kFloat32Constant:
UNREACHABLE();
default:
break;
}
if (output_rep == MachineRepresentation::kTaggedSigned ||
output_rep == MachineRepresentation::kTaggedPointer) {
// this is a no-op.
return node;
}
// Select the correct X -> Tagged operator.
const Operator* op;
if (output_type.Is(Type::None())) {
// This is an impossible value; it should not be used at runtime.
return jsgraph()->graph()->NewNode(
jsgraph()->common()->DeadValue(MachineRepresentation::kTagged), node);
} else if (output_rep == MachineRepresentation::kBit) {
if (output_type.Is(Type::Boolean())) {
op = simplified()->ChangeBitToTagged();
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kTagged);
}
} else if (IsWord(output_rep)) {
if (output_type.Is(Type::Signed31())) {
op = simplified()->ChangeInt31ToTaggedSigned();
} else if (output_type.Is(Type::Signed32()) ||
(output_type.Is(Type::Signed32OrMinusZero()) &&
truncation.IdentifiesZeroAndMinusZero())) {
op = simplified()->ChangeInt32ToTagged();
} else if (output_type.Is(Type::Unsigned32()) ||
(output_type.Is(Type::Unsigned32OrMinusZero()) &&
truncation.IdentifiesZeroAndMinusZero()) ||
truncation.IsUsedAsWord32()) {
// Either the output is uint32 or the uses only care about the
// low 32 bits (so we can pick uint32 safely).
op = simplified()->ChangeUint32ToTagged();
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kTagged);
}
} else if (output_rep == MachineRepresentation::kWord64) {
if (output_type.Is(Type::Signed31())) {
// int64 -> int32 -> tagged signed
node = InsertTruncateInt64ToInt32(node);
op = simplified()->ChangeInt31ToTaggedSigned();
} else if (output_type.Is(Type::Signed32())) {
// int64 -> int32 -> tagged
node = InsertTruncateInt64ToInt32(node);
op = simplified()->ChangeInt32ToTagged();
} else if (output_type.Is(Type::Unsigned32())) {
// int64 -> uint32 -> tagged
node = InsertTruncateInt64ToInt32(node);
op = simplified()->ChangeUint32ToTagged();
} else if (output_type.Is(cache_->kPositiveSafeInteger)) {
// uint64 -> tagged
op = simplified()->ChangeUint64ToTagged();
} else if (output_type.Is(cache_->kSafeInteger)) {
// int64 -> tagged
op = simplified()->ChangeInt64ToTagged();
} else if (output_type.Is(Type::BigInt())) {
// uint64 -> BigInt
op = simplified()->ChangeUint64ToBigInt();
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kTagged);
}
} else if (output_rep ==
MachineRepresentation::kFloat32) { // float32 -> float64 -> tagged
node = InsertChangeFloat32ToFloat64(node);
op = simplified()->ChangeFloat64ToTagged(
output_type.Maybe(Type::MinusZero())
? CheckForMinusZeroMode::kCheckForMinusZero
: CheckForMinusZeroMode::kDontCheckForMinusZero);
} else if (output_rep == MachineRepresentation::kFloat64) {
if (output_type.Is(Type::Signed31())) { // float64 -> int32 -> tagged
node = InsertChangeFloat64ToInt32(node);
op = simplified()->ChangeInt31ToTaggedSigned();
} else if (output_type.Is(
Type::Signed32())) { // float64 -> int32 -> tagged
node = InsertChangeFloat64ToInt32(node);
op = simplified()->ChangeInt32ToTagged();
} else if (output_type.Is(
Type::Unsigned32())) { // float64 -> uint32 -> tagged
node = InsertChangeFloat64ToUint32(node);
op = simplified()->ChangeUint32ToTagged();
} else if (output_type.Is(Type::Number()) ||
(output_type.Is(Type::NumberOrOddball()) &&
truncation.TruncatesOddballAndBigIntToNumber())) {
op = simplified()->ChangeFloat64ToTagged(
output_type.Maybe(Type::MinusZero())
? CheckForMinusZeroMode::kCheckForMinusZero
: CheckForMinusZeroMode::kDontCheckForMinusZero);
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kTagged);
}
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kTagged);
}
return jsgraph()->graph()->NewNode(op, node);
}
Node* RepresentationChanger::GetFloat32RepresentationFor(
Node* node, MachineRepresentation output_rep, Type output_type,
Truncation truncation) {
// Eagerly fold representation changes for constants.
switch (node->opcode()) {
case IrOpcode::kNumberConstant:
return jsgraph()->Float32Constant(
DoubleToFloat32(OpParameter<double>(node->op())));
case IrOpcode::kInt32Constant:
case IrOpcode::kFloat64Constant:
case IrOpcode::kFloat32Constant:
UNREACHABLE();
default:
break;
}
// Select the correct X -> Float32 operator.
const Operator* op = nullptr;
if (output_type.Is(Type::None())) {
// This is an impossible value; it should not be used at runtime.
return jsgraph()->graph()->NewNode(
jsgraph()->common()->DeadValue(MachineRepresentation::kFloat32), node);
} else if (IsWord(output_rep)) {
if (output_type.Is(Type::Signed32())) {
// int32 -> float64 -> float32
op = machine()->ChangeInt32ToFloat64();
node = jsgraph()->graph()->NewNode(op, node);
op = machine()->TruncateFloat64ToFloat32();
} else if (output_type.Is(Type::Unsigned32()) ||
truncation.IsUsedAsWord32()) {
// Either the output is uint32 or the uses only care about the
// low 32 bits (so we can pick uint32 safely).
// uint32 -> float64 -> float32
op = machine()->ChangeUint32ToFloat64();
node = jsgraph()->graph()->NewNode(op, node);
op = machine()->TruncateFloat64ToFloat32();
}
} else if (IsAnyTagged(output_rep)) {
if (output_type.Is(Type::NumberOrOddball())) {
// tagged -> float64 -> float32
if (output_type.Is(Type::Number())) {
op = simplified()->ChangeTaggedToFloat64();
} else {
op = simplified()->TruncateTaggedToFloat64();
}
node = jsgraph()->graph()->NewNode(op, node);
op = machine()->TruncateFloat64ToFloat32();
}
} else if (output_rep == MachineRepresentation::kFloat64) {
op = machine()->TruncateFloat64ToFloat32();
} else if (output_rep == MachineRepresentation::kWord64) {
if (output_type.Is(cache_->kSafeInteger)) {
// int64 -> float64 -> float32
op = machine()->ChangeInt64ToFloat64();
node = jsgraph()->graph()->NewNode(op, node);
op = machine()->TruncateFloat64ToFloat32();
}
}
if (op == nullptr) {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kFloat32);
}
return jsgraph()->graph()->NewNode(op, node);
}
Node* RepresentationChanger::GetFloat64RepresentationFor(
Node* node, MachineRepresentation output_rep, Type output_type,
Node* use_node, UseInfo use_info) {
NumberMatcher m(node);
if (m.HasResolvedValue()) {
// BigInts are not used as number constants.
DCHECK(use_info.type_check() != TypeCheckKind::kBigInt);
switch (use_info.type_check()) {
case TypeCheckKind::kNone:
case TypeCheckKind::kNumber:
case TypeCheckKind::kNumberOrBoolean:
case TypeCheckKind::kNumberOrOddball:
return jsgraph()->Float64Constant(m.ResolvedValue());
case TypeCheckKind::kBigInt:
case TypeCheckKind::kHeapObject:
case TypeCheckKind::kSigned32:
case TypeCheckKind::kSigned64:
case TypeCheckKind::kSignedSmall:
case TypeCheckKind::kArrayIndex:
break;
}
}
// Select the correct X -> Float64 operator.
const Operator* op = nullptr;
if (output_type.Is(Type::None())) {
// This is an impossible value; it should not be used at runtime.
return jsgraph()->graph()->NewNode(
jsgraph()->common()->DeadValue(MachineRepresentation::kFloat64), node);
} else if (IsWord(output_rep)) {
if (output_type.Is(Type::Signed32()) ||
(output_type.Is(Type::Signed32OrMinusZero()) &&
use_info.truncation().IdentifiesZeroAndMinusZero())) {
op = machine()->ChangeInt32ToFloat64();
} else if (output_type.Is(Type::Unsigned32()) ||
(output_type.Is(Type::Unsigned32OrMinusZero()) &&
use_info.truncation().IdentifiesZeroAndMinusZero()) ||
use_info.truncation().IsUsedAsWord32()) {
// Either the output is uint32 or the uses only care about the
// low 32 bits (so we can pick uint32 safely).
op = machine()->ChangeUint32ToFloat64();
}
} else if (output_rep == MachineRepresentation::kBit) {
CHECK(output_type.Is(Type::Boolean()));
if (use_info.truncation().TruncatesOddballAndBigIntToNumber() ||
use_info.type_check() == TypeCheckKind::kNumberOrBoolean ||
use_info.type_check() == TypeCheckKind::kNumberOrOddball) {
op = machine()->ChangeUint32ToFloat64();
} else {
CHECK_NE(use_info.type_check(), TypeCheckKind::kNone);
Node* unreachable =
InsertUnconditionalDeopt(use_node, DeoptimizeReason::kNotAHeapNumber);
return jsgraph()->graph()->NewNode(
jsgraph()->common()->DeadValue(MachineRepresentation::kFloat64),
unreachable);
}
} else if (IsAnyTagged(output_rep)) {
if (output_type.Is(Type::Undefined())) {
if (use_info.type_check() == TypeCheckKind::kNumberOrOddball ||
(use_info.type_check() == TypeCheckKind::kNone &&
use_info.truncation().TruncatesOddballAndBigIntToNumber())) {
return jsgraph()->Float64Constant(
std::numeric_limits<double>::quiet_NaN());
} else {
DCHECK(use_info.type_check() == TypeCheckKind::kNone ||
use_info.type_check() == TypeCheckKind::kNumber ||
use_info.type_check() == TypeCheckKind::kNumberOrBoolean);
Node* unreachable = InsertUnconditionalDeopt(
use_node, use_info.type_check() == TypeCheckKind::kNumber
? DeoptimizeReason::kNotANumber
: DeoptimizeReason::kNotANumberOrBoolean);
return jsgraph()->graph()->NewNode(
jsgraph()->common()->DeadValue(MachineRepresentation::kFloat64),
unreachable);
}
} else if (output_rep == MachineRepresentation::kTaggedSigned) {
node = InsertChangeTaggedSignedToInt32(node);
op = machine()->ChangeInt32ToFloat64();
} else if (output_type.Is(Type::Number())) {
op = simplified()->ChangeTaggedToFloat64();
} else if ((output_type.Is(Type::NumberOrOddball()) &&
use_info.truncation().TruncatesOddballAndBigIntToNumber()) ||
output_type.Is(Type::NumberOrHole())) {
// JavaScript 'null' is an Oddball that results in +0 when truncated to
// Number. In a context like -0 == null, which must evaluate to false,
// this truncation must not happen. For this reason we restrict this
// case to when either the user explicitly requested a float (and thus
// wants +0 if null is the input) or we know from the types that the
// input can only be Number | Hole. The latter is necessary to handle
// the operator CheckFloat64Hole. We did not put in the type (Number |
// Oddball \ Null) to discover more bugs related to this conversion via
// crashes.
op = simplified()->TruncateTaggedToFloat64();
} else if (use_info.type_check() == TypeCheckKind::kNumber ||
(use_info.type_check() == TypeCheckKind::kNumberOrOddball &&
!output_type.Maybe(Type::BooleanOrNullOrNumber()))) {
op = simplified()->CheckedTaggedToFloat64(CheckTaggedInputMode::kNumber,
use_info.feedback());
} else if (use_info.type_check() == TypeCheckKind::kNumberOrBoolean) {
op = simplified()->CheckedTaggedToFloat64(
CheckTaggedInputMode::kNumberOrBoolean, use_info.feedback());
} else if (use_info.type_check() == TypeCheckKind::kNumberOrOddball) {
op = simplified()->CheckedTaggedToFloat64(
CheckTaggedInputMode::kNumberOrOddball, use_info.feedback());
}
} else if (output_rep == MachineRepresentation::kFloat32) {
op = machine()->ChangeFloat32ToFloat64();
} else if (output_rep == MachineRepresentation::kWord64) {
if (output_type.Is(cache_->kSafeInteger)) {
op = machine()->ChangeInt64ToFloat64();
}
}
if (op == nullptr) {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kFloat64);
}
return InsertConversion(node, op, use_node);
}
Node* RepresentationChanger::MakeTruncatedInt32Constant(double value) {
return jsgraph()->Int32Constant(DoubleToInt32(value));
}
Node* RepresentationChanger::InsertUnconditionalDeopt(Node* node,
DeoptimizeReason reason) {
Node* effect = NodeProperties::GetEffectInput(node);
Node* control = NodeProperties::GetControlInput(node);
effect =
jsgraph()->graph()->NewNode(simplified()->CheckIf(reason),
jsgraph()->Int32Constant(0), effect, control);
Node* unreachable = effect = jsgraph()->graph()->NewNode(
jsgraph()->common()->Unreachable(), effect, control);
NodeProperties::ReplaceEffectInput(node, effect);
return unreachable;
}
Node* RepresentationChanger::GetWord32RepresentationFor(
Node* node, MachineRepresentation output_rep, Type output_type,
Node* use_node, UseInfo use_info) {
// Eagerly fold representation changes for constants.
switch (node->opcode()) {
case IrOpcode::kInt32Constant:
case IrOpcode::kInt64Constant:
case IrOpcode::kFloat32Constant:
case IrOpcode::kFloat64Constant:
UNREACHABLE();
case IrOpcode::kNumberConstant: {
double const fv = OpParameter<double>(node->op());
if (use_info.type_check() == TypeCheckKind::kNone ||
((use_info.type_check() == TypeCheckKind::kSignedSmall ||
use_info.type_check() == TypeCheckKind::kSigned32 ||
use_info.type_check() == TypeCheckKind::kNumber ||
use_info.type_check() == TypeCheckKind::kNumberOrOddball ||
use_info.type_check() == TypeCheckKind::kArrayIndex) &&
IsInt32Double(fv))) {
return MakeTruncatedInt32Constant(fv);
}
break;
}
default:
break;
}
// Select the correct X -> Word32 operator.
const Operator* op = nullptr;
if (output_type.Is(Type::None())) {
// This is an impossible value; it should not be used at runtime.
return jsgraph()->graph()->NewNode(
jsgraph()->common()->DeadValue(MachineRepresentation::kWord32), node);
} else if (output_rep == MachineRepresentation::kBit) {
CHECK(output_type.Is(Type::Boolean()));
if (use_info.truncation().IsUsedAsWord32()) {
return node;
} else {
CHECK(Truncation::Any(kIdentifyZeros)
.IsLessGeneralThan(use_info.truncation()));
CHECK_NE(use_info.type_check(), TypeCheckKind::kNone);
CHECK_NE(use_info.type_check(), TypeCheckKind::kNumberOrOddball);
Node* unreachable =
InsertUnconditionalDeopt(use_node, DeoptimizeReason::kNotASmi);
return jsgraph()->graph()->NewNode(
jsgraph()->common()->DeadValue(MachineRepresentation::kWord32),
unreachable);
}
} else if (output_rep == MachineRepresentation::kFloat64) {
if (output_type.Is(Type::Signed32())) {
op = machine()->ChangeFloat64ToInt32();
} else if (use_info.type_check() == TypeCheckKind::kSignedSmall ||
use_info.type_check() == TypeCheckKind::kSigned32 ||
use_info.type_check() == TypeCheckKind::kArrayIndex) {
op = simplified()->CheckedFloat64ToInt32(
output_type.Maybe(Type::MinusZero())
? use_info.minus_zero_check()
: CheckForMinusZeroMode::kDontCheckForMinusZero,
use_info.feedback());
} else if (output_type.Is(Type::Unsigned32())) {
op = machine()->ChangeFloat64ToUint32();
} else if (use_info.truncation().IsUsedAsWord32()) {
op = machine()->TruncateFloat64ToWord32();
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kWord32);
}
} else if (output_rep == MachineRepresentation::kFloat32) {
node = InsertChangeFloat32ToFloat64(node); // float32 -> float64 -> int32
if (output_type.Is(Type::Signed32())) {
op = machine()->ChangeFloat64ToInt32();
} else if (use_info.type_check() == TypeCheckKind::kSignedSmall ||
use_info.type_check() == TypeCheckKind::kSigned32 ||
use_info.type_check() == TypeCheckKind::kArrayIndex) {
op = simplified()->CheckedFloat64ToInt32(
output_type.Maybe(Type::MinusZero())
? use_info.minus_zero_check()
: CheckForMinusZeroMode::kDontCheckForMinusZero,
use_info.feedback());
} else if (output_type.Is(Type::Unsigned32())) {
op = machine()->ChangeFloat64ToUint32();
} else if (use_info.truncation().IsUsedAsWord32()) {
op = machine()->TruncateFloat64ToWord32();
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kWord32);
}
} else if (IsAnyTagged(output_rep)) {
if (output_rep == MachineRepresentation::kTaggedSigned &&
output_type.Is(Type::SignedSmall())) {
op = simplified()->ChangeTaggedSignedToInt32();
} else if (output_type.Is(Type::Signed32())) {
op = simplified()->ChangeTaggedToInt32();
} else if (use_info.type_check() == TypeCheckKind::kSignedSmall) {
op = simplified()->CheckedTaggedSignedToInt32(use_info.feedback());
} else if (use_info.type_check() == TypeCheckKind::kSigned32) {
op = simplified()->CheckedTaggedToInt32(
output_type.Maybe(Type::MinusZero())
? use_info.minus_zero_check()
: CheckForMinusZeroMode::kDontCheckForMinusZero,
use_info.feedback());
} else if (use_info.type_check() == TypeCheckKind::kArrayIndex) {
op = simplified()->CheckedTaggedToArrayIndex(use_info.feedback());
} else if (output_type.Is(Type::Unsigned32())) {
op = simplified()->ChangeTaggedToUint32();
} else if (use_info.truncation().IsUsedAsWord32()) {
if (output_type.Is(Type::NumberOrOddball())) {
op = simplified()->TruncateTaggedToWord32();
} else if (use_info.type_check() == TypeCheckKind::kNumber) {
op = simplified()->CheckedTruncateTaggedToWord32(
CheckTaggedInputMode::kNumber, use_info.feedback());
} else if (use_info.type_check() == TypeCheckKind::kNumberOrOddball) {
op = simplified()->CheckedTruncateTaggedToWord32(
CheckTaggedInputMode::kNumberOrOddball, use_info.feedback());
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kWord32);
}
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kWord32);
}
} else if (output_rep == MachineRepresentation::kWord32) {
// Only the checked case should get here, the non-checked case is
// handled in GetRepresentationFor.
if (use_info.type_check() == TypeCheckKind::kSignedSmall ||
use_info.type_check() == TypeCheckKind::kSigned32 ||
use_info.type_check() == TypeCheckKind::kArrayIndex) {
bool identify_zeros = use_info.truncation().IdentifiesZeroAndMinusZero();
if (output_type.Is(Type::Signed32()) ||
(identify_zeros && output_type.Is(Type::Signed32OrMinusZero()))) {
return node;
} else if (output_type.Is(Type::Unsigned32()) ||
(identify_zeros &&
output_type.Is(Type::Unsigned32OrMinusZero()))) {
op = simplified()->CheckedUint32ToInt32(use_info.feedback());
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kWord32);
}
} else if (use_info.type_check() == TypeCheckKind::kNumber ||
use_info.type_check() == TypeCheckKind::kNumberOrOddball) {
return node;
}
} else if (output_rep == MachineRepresentation::kWord8 ||
output_rep == MachineRepresentation::kWord16) {
DCHECK_EQ(MachineRepresentation::kWord32, use_info.representation());
DCHECK(use_info.type_check() == TypeCheckKind::kSignedSmall ||
use_info.type_check() == TypeCheckKind::kSigned32);
return node;
} else if (output_rep == MachineRepresentation::kWord64) {
if (output_type.Is(Type::Signed32()) ||
(output_type.Is(Type::Unsigned32()) &&
use_info.type_check() == TypeCheckKind::kNone) ||
(output_type.Is(cache_->kSafeInteger) &&
use_info.truncation().IsUsedAsWord32())) {
op = machine()->TruncateInt64ToInt32();
} else if (use_info.type_check() == TypeCheckKind::kSignedSmall ||
use_info.type_check() == TypeCheckKind::kSigned32 ||
use_info.type_check() == TypeCheckKind::kArrayIndex) {
if (output_type.Is(cache_->kPositiveSafeInteger)) {
op = simplified()->CheckedUint64ToInt32(use_info.feedback());
} else if (output_type.Is(cache_->kSafeInteger)) {
op = simplified()->CheckedInt64ToInt32(use_info.feedback());
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kWord32);
}
} else {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kWord32);
}
}
if (op == nullptr) {
return TypeError(node, output_rep, output_type,
MachineRepresentation::kWord32);
}
return InsertConversion(node, op, use_node);
}
Node* RepresentationChanger::InsertConversion(Node* node, const Operator* op,
Node* use_node) {
if (op->ControlInputCount() > 0) {
// If the operator can deoptimize (which means it has control
// input), we need to connect it to the effect and control chains.
Node* effect = NodeProperties::GetEffectInput(use_node);
Node* control = NodeProperties::GetControlInput(use_node);
Node* conversion = jsgraph()->graph()->NewNode(op, node, effect, control);
NodeProperties::ReplaceEffectInput(use_node, conversion);