// Copyright 2012 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.
#ifndef V8_CRANKSHAFT_HYDROGEN_INSTRUCTIONS_H_
#define V8_CRANKSHAFT_HYDROGEN_INSTRUCTIONS_H_
#include <cstring>
#include <iosfwd>
#include "src/allocation.h"
#include "src/base/bits.h"
#include "src/bit-vector.h"
#include "src/code-stubs.h"
#include "src/conversions.h"
#include "src/crankshaft/hydrogen-types.h"
#include "src/crankshaft/unique.h"
#include "src/deoptimizer.h"
#include "src/small-pointer-list.h"
#include "src/utils.h"
#include "src/zone.h"
namespace v8 {
namespace internal {
// Forward declarations.
struct ChangesOf;
class HBasicBlock;
class HDiv;
class HEnvironment;
class HInferRepresentationPhase;
class HInstruction;
class HLoopInformation;
class HStoreNamedField;
class HValue;
class LInstruction;
class LChunkBuilder;
#define HYDROGEN_ABSTRACT_INSTRUCTION_LIST(V) \
V(ArithmeticBinaryOperation) \
V(BinaryOperation) \
V(BitwiseBinaryOperation) \
V(ControlInstruction) \
V(Instruction)
#define HYDROGEN_CONCRETE_INSTRUCTION_LIST(V) \
V(AbnormalExit) \
V(AccessArgumentsAt) \
V(Add) \
V(Allocate) \
V(ApplyArguments) \
V(ArgumentsElements) \
V(ArgumentsLength) \
V(ArgumentsObject) \
V(Bitwise) \
V(BlockEntry) \
V(BoundsCheck) \
V(Branch) \
V(CallWithDescriptor) \
V(CallNewArray) \
V(CallRuntime) \
V(CapturedObject) \
V(Change) \
V(CheckArrayBufferNotNeutered) \
V(CheckHeapObject) \
V(CheckInstanceType) \
V(CheckMaps) \
V(CheckMapValue) \
V(CheckSmi) \
V(CheckValue) \
V(ClampToUint8) \
V(ClassOfTestAndBranch) \
V(CompareNumericAndBranch) \
V(CompareHoleAndBranch) \
V(CompareGeneric) \
V(CompareObjectEqAndBranch) \
V(CompareMap) \
V(Constant) \
V(Context) \
V(DebugBreak) \
V(DeclareGlobals) \
V(Deoptimize) \
V(Div) \
V(DoubleBits) \
V(DummyUse) \
V(EnterInlined) \
V(EnvironmentMarker) \
V(ForceRepresentation) \
V(ForInCacheArray) \
V(ForInPrepareMap) \
V(GetCachedArrayIndex) \
V(Goto) \
V(HasCachedArrayIndexAndBranch) \
V(HasInstanceTypeAndBranch) \
V(InnerAllocatedObject) \
V(InvokeFunction) \
V(HasInPrototypeChainAndBranch) \
V(IsStringAndBranch) \
V(IsSmiAndBranch) \
V(IsUndetectableAndBranch) \
V(LeaveInlined) \
V(LoadContextSlot) \
V(LoadFieldByIndex) \
V(LoadFunctionPrototype) \
V(LoadGlobalGeneric) \
V(LoadKeyed) \
V(LoadKeyedGeneric) \
V(LoadNamedField) \
V(LoadNamedGeneric) \
V(LoadRoot) \
V(MathFloorOfDiv) \
V(MathMinMax) \
V(MaybeGrowElements) \
V(Mod) \
V(Mul) \
V(OsrEntry) \
V(Parameter) \
V(Power) \
V(Prologue) \
V(PushArguments) \
V(Return) \
V(Ror) \
V(Sar) \
V(SeqStringGetChar) \
V(SeqStringSetChar) \
V(Shl) \
V(Shr) \
V(Simulate) \
V(StackCheck) \
V(StoreCodeEntry) \
V(StoreContextSlot) \
V(StoreKeyed) \
V(StoreKeyedGeneric) \
V(StoreNamedField) \
V(StoreNamedGeneric) \
V(StringAdd) \
V(StringCharCodeAt) \
V(StringCharFromCode) \
V(StringCompareAndBranch) \
V(Sub) \
V(ThisFunction) \
V(TransitionElementsKind) \
V(TrapAllocationMemento) \
V(Typeof) \
V(TypeofIsAndBranch) \
V(UnaryMathOperation) \
V(UnknownOSRValue) \
V(UseConst) \
V(WrapReceiver)
#define GVN_TRACKED_FLAG_LIST(V) \
V(NewSpacePromotion)
#define GVN_UNTRACKED_FLAG_LIST(V) \
V(ArrayElements) \
V(ArrayLengths) \
V(StringLengths) \
V(BackingStoreFields) \
V(Calls) \
V(ContextSlots) \
V(DoubleArrayElements) \
V(DoubleFields) \
V(ElementsKind) \
V(ElementsPointer) \
V(GlobalVars) \
V(InobjectFields) \
V(Maps) \
V(OsrEntries) \
V(ExternalMemory) \
V(StringChars) \
V(TypedArrayElements)
#define DECLARE_ABSTRACT_INSTRUCTION(type) \
bool Is##type() const final { return true; } \
static H##type* cast(HValue* value) { \
DCHECK(value->Is##type()); \
return reinterpret_cast<H##type*>(value); \
}
#define DECLARE_CONCRETE_INSTRUCTION(type) \
LInstruction* CompileToLithium(LChunkBuilder* builder) final; \
static H##type* cast(HValue* value) { \
DCHECK(value->Is##type()); \
return reinterpret_cast<H##type*>(value); \
} \
Opcode opcode() const final { return HValue::k##type; }
enum PropertyAccessType { LOAD, STORE };
class Range final : public ZoneObject {
public:
Range()
: lower_(kMinInt),
upper_(kMaxInt),
next_(NULL),
can_be_minus_zero_(false) { }
Range(int32_t lower, int32_t upper)
: lower_(lower),
upper_(upper),
next_(NULL),
can_be_minus_zero_(false) { }
int32_t upper() const { return upper_; }
int32_t lower() const { return lower_; }
Range* next() const { return next_; }
Range* CopyClearLower(Zone* zone) const {
return new(zone) Range(kMinInt, upper_);
}
Range* CopyClearUpper(Zone* zone) const {
return new(zone) Range(lower_, kMaxInt);
}
Range* Copy(Zone* zone) const {
Range* result = new(zone) Range(lower_, upper_);
result->set_can_be_minus_zero(CanBeMinusZero());
return result;
}
int32_t Mask() const;
void set_can_be_minus_zero(bool b) { can_be_minus_zero_ = b; }
bool CanBeMinusZero() const { return CanBeZero() && can_be_minus_zero_; }
bool CanBeZero() const { return upper_ >= 0 && lower_ <= 0; }
bool CanBeNegative() const { return lower_ < 0; }
bool CanBePositive() const { return upper_ > 0; }
bool Includes(int value) const { return lower_ <= value && upper_ >= value; }
bool IsMostGeneric() const {
return lower_ == kMinInt && upper_ == kMaxInt && CanBeMinusZero();
}
bool IsInSmiRange() const {
return lower_ >= Smi::kMinValue && upper_ <= Smi::kMaxValue;
}
void ClampToSmi() {
lower_ = Max(lower_, Smi::kMinValue);
upper_ = Min(upper_, Smi::kMaxValue);
}
void KeepOrder();
#ifdef DEBUG
void Verify() const;
#endif
void StackUpon(Range* other) {
Intersect(other);
next_ = other;
}
void Intersect(Range* other);
void Union(Range* other);
void CombinedMax(Range* other);
void CombinedMin(Range* other);
void AddConstant(int32_t value);
void Sar(int32_t value);
void Shl(int32_t value);
bool AddAndCheckOverflow(const Representation& r, Range* other);
bool SubAndCheckOverflow(const Representation& r, Range* other);
bool MulAndCheckOverflow(const Representation& r, Range* other);
private:
int32_t lower_;
int32_t upper_;
Range* next_;
bool can_be_minus_zero_;
};
class HUseListNode: public ZoneObject {
public:
HUseListNode(HValue* value, int index, HUseListNode* tail)
: tail_(tail), value_(value), index_(index) {
}
HUseListNode* tail();
HValue* value() const { return value_; }
int index() const { return index_; }
void set_tail(HUseListNode* list) { tail_ = list; }
#ifdef DEBUG
void Zap() {
tail_ = reinterpret_cast<HUseListNode*>(1);
value_ = NULL;
index_ = -1;
}
#endif
private:
HUseListNode* tail_;
HValue* value_;
int index_;
};
// We reuse use list nodes behind the scenes as uses are added and deleted.
// This class is the safe way to iterate uses while deleting them.
class HUseIterator final BASE_EMBEDDED {
public:
bool Done() { return current_ == NULL; }
void Advance();
HValue* value() {
DCHECK(!Done());
return value_;
}
int index() {
DCHECK(!Done());
return index_;
}
private:
explicit HUseIterator(HUseListNode* head);
HUseListNode* current_;
HUseListNode* next_;
HValue* value_;
int index_;
friend class HValue;
};
// All tracked flags should appear before untracked ones.
enum GVNFlag {
// Declare global value numbering flags.
#define DECLARE_FLAG(Type) k##Type,
GVN_TRACKED_FLAG_LIST(DECLARE_FLAG)
GVN_UNTRACKED_FLAG_LIST(DECLARE_FLAG)
#undef DECLARE_FLAG
#define COUNT_FLAG(Type) + 1
kNumberOfTrackedSideEffects = 0 GVN_TRACKED_FLAG_LIST(COUNT_FLAG),
kNumberOfUntrackedSideEffects = 0 GVN_UNTRACKED_FLAG_LIST(COUNT_FLAG),
#undef COUNT_FLAG
kNumberOfFlags = kNumberOfTrackedSideEffects + kNumberOfUntrackedSideEffects
};
static inline GVNFlag GVNFlagFromInt(int i) {
DCHECK(i >= 0);
DCHECK(i < kNumberOfFlags);
return static_cast<GVNFlag>(i);
}
class DecompositionResult final BASE_EMBEDDED {
public:
DecompositionResult() : base_(NULL), offset_(0), scale_(0) {}
HValue* base() { return base_; }
int offset() { return offset_; }
int scale() { return scale_; }
bool Apply(HValue* other_base, int other_offset, int other_scale = 0) {
if (base_ == NULL) {
base_ = other_base;
offset_ = other_offset;
scale_ = other_scale;
return true;
} else {
if (scale_ == 0) {
base_ = other_base;
offset_ += other_offset;
scale_ = other_scale;
return true;
} else {
return false;
}
}
}
void SwapValues(HValue** other_base, int* other_offset, int* other_scale) {
swap(&base_, other_base);
swap(&offset_, other_offset);
swap(&scale_, other_scale);
}
private:
template <class T> void swap(T* a, T* b) {
T c(*a);
*a = *b;
*b = c;
}
HValue* base_;
int offset_;
int scale_;
};
typedef EnumSet<GVNFlag, int32_t> GVNFlagSet;
class HValue : public ZoneObject {
public:
static const int kNoNumber = -1;
enum Flag {
kFlexibleRepresentation,
kCannotBeTagged,
// Participate in Global Value Numbering, i.e. elimination of
// unnecessary recomputations. If an instruction sets this flag, it must
// implement DataEquals(), which will be used to determine if other
// occurrences of the instruction are indeed the same.
kUseGVN,
// Track instructions that are dominating side effects. If an instruction
// sets this flag, it must implement HandleSideEffectDominator() and should
// indicate which side effects to track by setting GVN flags.
kTrackSideEffectDominators,
kCanOverflow,
kBailoutOnMinusZero,
kCanBeDivByZero,
kLeftCanBeMinInt,
kLeftCanBeNegative,
kLeftCanBePositive,
kAllowUndefinedAsNaN,
kIsArguments,
kTruncatingToInt32,
kAllUsesTruncatingToInt32,
kTruncatingToSmi,
kAllUsesTruncatingToSmi,
// Set after an instruction is killed.
kIsDead,
// Instructions that are allowed to produce full range unsigned integer
// values are marked with kUint32 flag. If arithmetic shift or a load from
// EXTERNAL_UINT32_ELEMENTS array is not marked with this flag
// it will deoptimize if result does not fit into signed integer range.
// HGraph::ComputeSafeUint32Operations is responsible for setting this
// flag.
kUint32,
kHasNoObservableSideEffects,
// Indicates an instruction shouldn't be replaced by optimization, this flag
// is useful to set in cases where recomputing a value is cheaper than
// extending the value's live range and spilling it.
kCantBeReplaced,
// Indicates the instruction is live during dead code elimination.
kIsLive,
// HEnvironmentMarkers are deleted before dead code
// elimination takes place, so they can repurpose the kIsLive flag:
kEndsLiveRange = kIsLive,
// TODO(everyone): Don't forget to update this!
kLastFlag = kIsLive
};
STATIC_ASSERT(kLastFlag < kBitsPerInt);
static HValue* cast(HValue* value) { return value; }
enum Opcode {
// Declare a unique enum value for each hydrogen instruction.
#define DECLARE_OPCODE(type) k##type,
HYDROGEN_CONCRETE_INSTRUCTION_LIST(DECLARE_OPCODE)
kPhi
#undef DECLARE_OPCODE
};
virtual Opcode opcode() const = 0;
// Declare a non-virtual predicates for each concrete HInstruction or HValue.
#define DECLARE_PREDICATE(type) \
bool Is##type() const { return opcode() == k##type; }
HYDROGEN_CONCRETE_INSTRUCTION_LIST(DECLARE_PREDICATE)
#undef DECLARE_PREDICATE
bool IsPhi() const { return opcode() == kPhi; }
// Declare virtual predicates for abstract HInstruction or HValue
#define DECLARE_PREDICATE(type) \
virtual bool Is##type() const { return false; }
HYDROGEN_ABSTRACT_INSTRUCTION_LIST(DECLARE_PREDICATE)
#undef DECLARE_PREDICATE
bool IsBitwiseBinaryShift() {
return IsShl() || IsShr() || IsSar();
}
explicit HValue(HType type = HType::Tagged())
: block_(NULL),
id_(kNoNumber),
type_(type),
use_list_(NULL),
range_(NULL),
#ifdef DEBUG
range_poisoned_(false),
#endif
flags_(0) {}
virtual ~HValue() {}
virtual SourcePosition position() const { return SourcePosition::Unknown(); }
virtual SourcePosition operand_position(int index) const {
return position();
}
HBasicBlock* block() const { return block_; }
void SetBlock(HBasicBlock* block);
// Note: Never call this method for an unlinked value.
Isolate* isolate() const;
int id() const { return id_; }
void set_id(int id) { id_ = id; }
HUseIterator uses() const { return HUseIterator(use_list_); }
virtual bool EmitAtUses() { return false; }
Representation representation() const { return representation_; }
void ChangeRepresentation(Representation r) {
DCHECK(CheckFlag(kFlexibleRepresentation));
DCHECK(!CheckFlag(kCannotBeTagged) || !r.IsTagged());
RepresentationChanged(r);
representation_ = r;
if (r.IsTagged()) {
// Tagged is the bottom of the lattice, don't go any further.
ClearFlag(kFlexibleRepresentation);
}
}
virtual void AssumeRepresentation(Representation r);
virtual Representation KnownOptimalRepresentation() {
Representation r = representation();
if (r.IsTagged()) {
HType t = type();
if (t.IsSmi()) return Representation::Smi();
if (t.IsHeapNumber()) return Representation::Double();
if (t.IsHeapObject()) return r;
return Representation::None();
}
return r;
}
HType type() const { return type_; }
void set_type(HType new_type) {
DCHECK(new_type.IsSubtypeOf(type_));
type_ = new_type;
}
// There are HInstructions that do not really change a value, they
// only add pieces of information to it (like bounds checks, map checks,
// smi checks...).
// We call these instructions "informative definitions", or "iDef".
// One of the iDef operands is special because it is the value that is
// "transferred" to the output, we call it the "redefined operand".
// If an HValue is an iDef it must override RedefinedOperandIndex() so that
// it does not return kNoRedefinedOperand;
static const int kNoRedefinedOperand = -1;
virtual int RedefinedOperandIndex() { return kNoRedefinedOperand; }
bool IsInformativeDefinition() {
return RedefinedOperandIndex() != kNoRedefinedOperand;
}
HValue* RedefinedOperand() {
int index = RedefinedOperandIndex();
return index == kNoRedefinedOperand ? NULL : OperandAt(index);
}
bool CanReplaceWithDummyUses();
virtual int argument_delta() const { return 0; }
// A purely informative definition is an idef that will not emit code and
// should therefore be removed from the graph in the RestoreActualValues
// phase (so that live ranges will be shorter).
virtual bool IsPurelyInformativeDefinition() { return false; }
// This method must always return the original HValue SSA definition,
// regardless of any chain of iDefs of this value.
HValue* ActualValue() {
HValue* value = this;
int index;
while ((index = value->RedefinedOperandIndex()) != kNoRedefinedOperand) {
value = value->OperandAt(index);
}
return value;
}
bool IsInteger32Constant();
int32_t GetInteger32Constant();
bool EqualsInteger32Constant(int32_t value);
bool IsDefinedAfter(HBasicBlock* other) const;
// Operands.
virtual int OperandCount() const = 0;
virtual HValue* OperandAt(int index) const = 0;
void SetOperandAt(int index, HValue* value);
void DeleteAndReplaceWith(HValue* other);
void ReplaceAllUsesWith(HValue* other);
bool HasNoUses() const { return use_list_ == NULL; }
bool HasOneUse() const {
return use_list_ != NULL && use_list_->tail() == NULL;
}
bool HasMultipleUses() const {
return use_list_ != NULL && use_list_->tail() != NULL;
}
int UseCount() const;
// Mark this HValue as dead and to be removed from other HValues' use lists.
void Kill();
int flags() const { return flags_; }
void SetFlag(Flag f) { flags_ |= (1 << f); }
void ClearFlag(Flag f) { flags_ &= ~(1 << f); }
bool CheckFlag(Flag f) const { return (flags_ & (1 << f)) != 0; }
void CopyFlag(Flag f, HValue* other) {
if (other->CheckFlag(f)) SetFlag(f);
}
// Returns true if the flag specified is set for all uses, false otherwise.
bool CheckUsesForFlag(Flag f) const;
// Same as before and the first one without the flag is returned in value.
bool CheckUsesForFlag(Flag f, HValue** value) const;
// Returns true if the flag specified is set for all uses, and this set
// of uses is non-empty.
bool HasAtLeastOneUseWithFlagAndNoneWithout(Flag f) const;
GVNFlagSet ChangesFlags() const { return changes_flags_; }
GVNFlagSet DependsOnFlags() const { return depends_on_flags_; }
void SetChangesFlag(GVNFlag f) { changes_flags_.Add(f); }
void SetDependsOnFlag(GVNFlag f) { depends_on_flags_.Add(f); }
void ClearChangesFlag(GVNFlag f) { changes_flags_.Remove(f); }
void ClearDependsOnFlag(GVNFlag f) { depends_on_flags_.Remove(f); }
bool CheckChangesFlag(GVNFlag f) const {
return changes_flags_.Contains(f);
}
bool CheckDependsOnFlag(GVNFlag f) const {
return depends_on_flags_.Contains(f);
}
void SetAllSideEffects() { changes_flags_.Add(AllSideEffectsFlagSet()); }
void ClearAllSideEffects() {
changes_flags_.Remove(AllSideEffectsFlagSet());
}
bool HasSideEffects() const {
return changes_flags_.ContainsAnyOf(AllSideEffectsFlagSet());
}
bool HasObservableSideEffects() const {
return !CheckFlag(kHasNoObservableSideEffects) &&
changes_flags_.ContainsAnyOf(AllObservableSideEffectsFlagSet());
}
GVNFlagSet SideEffectFlags() const {
GVNFlagSet result = ChangesFlags();
result.Intersect(AllSideEffectsFlagSet());
return result;
}
GVNFlagSet ObservableChangesFlags() const {
GVNFlagSet result = ChangesFlags();
result.Intersect(AllObservableSideEffectsFlagSet());
return result;
}
Range* range() const {
DCHECK(!range_poisoned_);
return range_;
}
bool HasRange() const {
DCHECK(!range_poisoned_);
return range_ != NULL;
}
#ifdef DEBUG
void PoisonRange() { range_poisoned_ = true; }
#endif
void AddNewRange(Range* r, Zone* zone);
void RemoveLastAddedRange();
void ComputeInitialRange(Zone* zone);
// Escape analysis helpers.
virtual bool HasEscapingOperandAt(int index) { return true; }
virtual bool HasOutOfBoundsAccess(int size) { return false; }
// Representation helpers.
virtual Representation observed_input_representation(int index) {
return Representation::None();
}
virtual Representation RequiredInputRepresentation(int index) = 0;
virtual void InferRepresentation(HInferRepresentationPhase* h_infer);
// This gives the instruction an opportunity to replace itself with an
// instruction that does the same in some better way. To replace an
// instruction with a new one, first add the new instruction to the graph,
// then return it. Return NULL to have the instruction deleted.
virtual HValue* Canonicalize() { return this; }
bool Equals(HValue* other);
virtual intptr_t Hashcode();
// Compute unique ids upfront that is safe wrt GC and concurrent compilation.
virtual void FinalizeUniqueness() { }
// Printing support.
virtual std::ostream& PrintTo(std::ostream& os) const = 0; // NOLINT
const char* Mnemonic() const;
// Type information helpers.
bool HasMonomorphicJSObjectType();
// TODO(mstarzinger): For now instructions can override this function to
// specify statically known types, once HType can convey more information
// it should be based on the HType.
virtual Handle<Map> GetMonomorphicJSObjectMap() { return Handle<Map>(); }
// Updated the inferred type of this instruction and returns true if
// it has changed.
bool UpdateInferredType();
virtual HType CalculateInferredType();
// This function must be overridden for instructions which have the
// kTrackSideEffectDominators flag set, to track instructions that are
// dominating side effects.
// It returns true if it removed an instruction which had side effects.
virtual bool HandleSideEffectDominator(GVNFlag side_effect,
HValue* dominator) {
UNREACHABLE();
return false;
}
// Check if this instruction has some reason that prevents elimination.
bool CannotBeEliminated() const {
return HasObservableSideEffects() || !IsDeletable();
}
#ifdef DEBUG
virtual void Verify() = 0;
#endif
// Returns true conservatively if the program might be able to observe a
// ToString() operation on this value.
bool ToStringCanBeObserved() const {
return ToStringOrToNumberCanBeObserved();
}
// Returns true conservatively if the program might be able to observe a
// ToNumber() operation on this value.
bool ToNumberCanBeObserved() const {
return ToStringOrToNumberCanBeObserved();
}
MinusZeroMode GetMinusZeroMode() {
return CheckFlag(kBailoutOnMinusZero)
? FAIL_ON_MINUS_ZERO : TREAT_MINUS_ZERO_AS_ZERO;
}
protected:
// This function must be overridden for instructions with flag kUseGVN, to
// compare the non-Operand parts of the instruction.
virtual bool DataEquals(HValue* other) {
UNREACHABLE();
return false;
}
bool ToStringOrToNumberCanBeObserved() const {
if (type().IsTaggedPrimitive()) return false;
if (type().IsJSReceiver()) return true;
return !representation().IsSmiOrInteger32() && !representation().IsDouble();
}
virtual Representation RepresentationFromInputs() {
return representation();
}
virtual Representation RepresentationFromUses();
Representation RepresentationFromUseRequirements();
bool HasNonSmiUse();
virtual void UpdateRepresentation(Representation new_rep,
HInferRepresentationPhase* h_infer,
const char* reason);
void AddDependantsToWorklist(HInferRepresentationPhase* h_infer);
virtual void RepresentationChanged(Representation to) { }
virtual Range* InferRange(Zone* zone);
virtual void DeleteFromGraph() = 0;
virtual void InternalSetOperandAt(int index, HValue* value) = 0;
void clear_block() {
DCHECK(block_ != NULL);
block_ = NULL;
}
void set_representation(Representation r) {
DCHECK(representation_.IsNone() && !r.IsNone());
representation_ = r;
}
static GVNFlagSet AllFlagSet() {
GVNFlagSet result;
#define ADD_FLAG(Type) result.Add(k##Type);
GVN_TRACKED_FLAG_LIST(ADD_FLAG)
GVN_UNTRACKED_FLAG_LIST(ADD_FLAG)
#undef ADD_FLAG
return result;
}
// A flag mask to mark an instruction as having arbitrary side effects.
static GVNFlagSet AllSideEffectsFlagSet() {
GVNFlagSet result = AllFlagSet();
result.Remove(kOsrEntries);
return result;
}
friend std::ostream& operator<<(std::ostream& os, const ChangesOf& v);
// A flag mask of all side effects that can make observable changes in
// an executing program (i.e. are not safe to repeat, move or remove);
static GVNFlagSet AllObservableSideEffectsFlagSet() {
GVNFlagSet result = AllFlagSet();
result.Remove(kNewSpacePromotion);
result.Remove(kElementsKind);
result.Remove(kElementsPointer);
result.Remove(kMaps);
return result;
}
// Remove the matching use from the use list if present. Returns the
// removed list node or NULL.
HUseListNode* RemoveUse(HValue* value, int index);
void RegisterUse(int index, HValue* new_value);
HBasicBlock* block_;
// The id of this instruction in the hydrogen graph, assigned when first
// added to the graph. Reflects creation order.
int id_;
Representation representation_;
HType type_;
HUseListNode* use_list_;
Range* range_;
#ifdef DEBUG
bool range_poisoned_;
#endif
int flags_;
GVNFlagSet changes_flags_;
GVNFlagSet depends_on_flags_;
private:
virtual bool IsDeletable() const { return false; }
DISALLOW_COPY_AND_ASSIGN(HValue);
};
// Support for printing various aspects of an HValue.
struct NameOf {
explicit NameOf(const HValue* const v) : value(v) {}
const HValue* value;
};
struct TypeOf {
explicit TypeOf(const HValue* const v) : value(v) {}
const HValue* value;
};
struct ChangesOf {
explicit ChangesOf(const HValue* const v) : value(v) {}
const HValue* value;
};
std::ostream& operator<<(std::ostream& os, const HValue& v);
std::ostream& operator<<(std::ostream& os, const NameOf& v);
std::ostream& operator<<(std::ostream& os, const TypeOf& v);
std::ostream& operator<<(std::ostream& os, const ChangesOf& v);
#define DECLARE_INSTRUCTION_FACTORY_P0(I) \
static I* New(Isolate* isolate, Zone* zone, HValue* context) { \
return new (zone) I(); \
}
#define DECLARE_INSTRUCTION_FACTORY_P1(I, P1) \
static I* New(Isolate* isolate, Zone* zone, HValue* context, P1 p1) { \
return new (zone) I(p1); \
}
#define DECLARE_INSTRUCTION_FACTORY_P2(I, P1, P2) \
static I* New(Isolate* isolate, Zone* zone, HValue* context, P1 p1, P2 p2) { \
return new (zone) I(p1, p2); \
}
#define DECLARE_INSTRUCTION_FACTORY_P3(I, P1, P2, P3) \
static I* New(Isolate* isolate, Zone* zone, HValue* context, P1 p1, P2 p2, \
P3 p3) { \
return new (zone) I(p1, p2, p3); \
}
#define DECLARE_INSTRUCTION_FACTORY_P4(I, P1, P2, P3, P4) \
static I* New(Isolate* isolate, Zone* zone, HValue* context, P1 p1, P2 p2, \
P3 p3, P4 p4) { \
return new (zone) I(p1, p2, p3, p4); \
}
#define DECLARE_INSTRUCTION_FACTORY_P5(I, P1, P2, P3, P4, P5) \
static I* New(Isolate* isolate, Zone* zone, HValue* context, P1 p1, P2 p2, \
P3 p3, P4 p4, P5 p5) { \
return new (zone) I(p1, p2, p3, p4, p5); \
}
#define DECLARE_INSTRUCTION_FACTORY_P6(I, P1, P2, P3, P4, P5, P6) \
static I* New(Isolate* isolate, Zone* zone, HValue* context, P1 p1, P2 p2, \
P3 p3, P4 p4, P5 p5, P6 p6) { \
return new (zone) I(p1, p2, p3, p4, p5, p6); \
}
#define DECLARE_INSTRUCTION_FACTORY_P7(I, P1, P2, P3, P4, P5, P6, P7) \
static I* New(Isolate* isolate, Zone* zone, HValue* context, P1 p1, P2 p2, \
P3 p3, P4 p4, P5 p5, P6 p6, P7 p7) { \
return new (zone) I(p1, p2, p3, p4, p5, p6, p7); \
}
#define DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P0(I) \
static I* New(Isolate* isolate, Zone* zone, HValue* context) { \
return new (zone) I(context); \
}
#define DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P1(I, P1) \
static I* New(Isolate* isolate, Zone* zone, HValue* context, P1 p1) { \
return new (zone) I(context, p1); \
}
#define DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P2(I, P1, P2) \
static I* New(Isolate* isolate, Zone* zone, HValue* context, P1 p1, P2 p2) { \
return new (zone) I(context, p1, p2); \
}
#define DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P3(I, P1, P2, P3) \
static I* New(Isolate* isolate, Zone* zone, HValue* context, P1 p1, P2 p2, \
P3 p3) { \
return new (zone) I(context, p1, p2, p3); \
}
#define DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P4(I, P1, P2, P3, P4) \
static I* New(Isolate* isolate, Zone* zone, HValue* context, P1 p1, P2 p2, \
P3 p3, P4 p4) { \
return new (zone) I(context, p1, p2, p3, p4); \
}
#define DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P5(I, P1, P2, P3, P4, P5) \
static I* New(Isolate* isolate, Zone* zone, HValue* context, P1 p1, P2 p2, \
P3 p3, P4 p4, P5 p5) { \
return new (zone) I(context, p1, p2, p3, p4, p5); \
}
#define DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P6(I, P1, P2, P3, P4, P5, P6) \
static I* New(Isolate* isolate, Zone* zone, HValue* context, P1 p1, P2 p2, \
P3 p3, P4 p4, P5 p5, P6 p6) { \
return new (zone) I(context, p1, p2, p3, p4, p5, p6); \
}
// A helper class to represent per-operand position information attached to
// the HInstruction in the compact form. Uses tagging to distinguish between
// case when only instruction's position is available and case when operands'
// positions are also available.
// In the first case it contains intruction's position as a tagged value.
// In the second case it points to an array which contains instruction's
// position and operands' positions.
class HPositionInfo {
public:
explicit HPositionInfo(int pos) : data_(TagPosition(pos)) { }
SourcePosition position() const {
if (has_operand_positions()) {
return operand_positions()[kInstructionPosIndex];
}
return SourcePosition::FromRaw(static_cast<int>(UntagPosition(data_)));
}
void set_position(SourcePosition pos) {
if (has_operand_positions()) {
operand_positions()[kInstructionPosIndex] = pos;
} else {
data_ = TagPosition(pos.raw());
}
}
void ensure_storage_for_operand_positions(Zone* zone, int operand_count) {
if (has_operand_positions()) {
return;
}
const int length = kFirstOperandPosIndex + operand_count;
SourcePosition* positions = zone->NewArray<SourcePosition>(length);
for (int i = 0; i < length; i++) {
positions[i] = SourcePosition::Unknown();
}
const SourcePosition pos = position();
data_ = reinterpret_cast<intptr_t>(positions);
set_position(pos);
DCHECK(has_operand_positions());
}
SourcePosition operand_position(int idx) const {
if (!has_operand_positions()) {
return position();
}
return *operand_position_slot(idx);
}
void set_operand_position(int idx, SourcePosition pos) {
*operand_position_slot(idx) = pos;
}
private:
static const intptr_t kInstructionPosIndex = 0;
static const intptr_t kFirstOperandPosIndex = 1;
SourcePosition* operand_position_slot(int idx) const {
DCHECK(has_operand_positions());
return &(operand_positions()[kFirstOperandPosIndex + idx]);
}
bool has_operand_positions() const {
return !IsTaggedPosition(data_);
}
SourcePosition* operand_positions() const {
DCHECK(has_operand_positions());
return reinterpret_cast<SourcePosition*>(data_);
}
static const intptr_t kPositionTag = 1;
static const intptr_t kPositionShift = 1;
static bool IsTaggedPosition(intptr_t val) {
return (val & kPositionTag) != 0;
}
static intptr_t UntagPosition(intptr_t val) {
DCHECK(IsTaggedPosition(val));
return val >> kPositionShift;
}
static intptr_t TagPosition(intptr_t val) {
const intptr_t result = (val << kPositionShift) | kPositionTag;
DCHECK(UntagPosition(result) == val);
return result;
}
intptr_t data_;
};
class HInstruction : public HValue {
public:
HInstruction* next() const { return next_; }
HInstruction* previous() const { return previous_; }
std::ostream& PrintTo(std::ostream& os) const override; // NOLINT
virtual std::ostream& PrintDataTo(std::ostream& os) const; // NOLINT
bool IsLinked() const { return block() != NULL; }
void Unlink();
void InsertBefore(HInstruction* next);
template<class T> T* Prepend(T* instr) {
instr->InsertBefore(this);
return instr;
}
void InsertAfter(HInstruction* previous);
template<class T> T* Append(T* instr) {
instr->InsertAfter(this);
return instr;
}
// The position is a write-once variable.
SourcePosition position() const override {
return SourcePosition(position_.position());
}
bool has_position() const {
return !position().IsUnknown();
}
void set_position(SourcePosition position) {
DCHECK(!has_position());
DCHECK(!position.IsUnknown());
position_.set_position(position);
}
SourcePosition operand_position(int index) const override {
const SourcePosition pos = position_.operand_position(index);
return pos.IsUnknown() ? position() : pos;
}
void set_operand_position(Zone* zone, int index, SourcePosition pos) {
DCHECK(0 <= index && index < OperandCount());
position_.ensure_storage_for_operand_positions(zone, OperandCount());
position_.set_operand_position(index, pos);
}
bool Dominates(HInstruction* other);
bool CanTruncateToSmi() const { return CheckFlag(kTruncatingToSmi); }
bool CanTruncateToInt32() const { return CheckFlag(kTruncatingToInt32); }
virtual LInstruction* CompileToLithium(LChunkBuilder* builder) = 0;
#ifdef DEBUG
void Verify() override;
#endif
bool CanDeoptimize();
virtual bool HasStackCheck() { return false; }
DECLARE_ABSTRACT_INSTRUCTION(Instruction)
protected:
explicit HInstruction(HType type = HType::Tagged())
: HValue(type),
next_(NULL),
previous_(NULL),
position_(RelocInfo::kNoPosition) {
SetDependsOnFlag(kOsrEntries);
}
void DeleteFromGraph() override { Unlink(); }
private:
void InitializeAsFirst(HBasicBlock* block) {
DCHECK(!IsLinked());
SetBlock(block);
}
HInstruction* next_;
HInstruction* previous_;
HPositionInfo position_;
friend class HBasicBlock;
};
template<int V>
class HTemplateInstruction : public HInstruction {
public:
int OperandCount() const final { return V; }
HValue* OperandAt(int i) const final { return inputs_[i]; }
protected:
explicit HTemplateInstruction(HType type = HType::Tagged())
: HInstruction(type) {}
void InternalSetOperandAt(int i, HValue* value) final { inputs_[i] = value; }
private:
EmbeddedContainer<HValue*, V> inputs_;
};
class HControlInstruction : public HInstruction {
public:
virtual HBasicBlock* SuccessorAt(int i) const = 0;
virtual int SuccessorCount() const = 0;
virtual void SetSuccessorAt(int i, HBasicBlock* block) = 0;
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
virtual bool KnownSuccessorBlock(HBasicBlock** block) {
*block = NULL;
return false;
}
HBasicBlock* FirstSuccessor() {
return SuccessorCount() > 0 ? SuccessorAt(0) : NULL;
}
HBasicBlock* SecondSuccessor() {
return SuccessorCount() > 1 ? SuccessorAt(1) : NULL;
}
void Not() {
HBasicBlock* swap = SuccessorAt(0);
SetSuccessorAt(0, SuccessorAt(1));
SetSuccessorAt(1, swap);
}
DECLARE_ABSTRACT_INSTRUCTION(ControlInstruction)
};
class HSuccessorIterator final BASE_EMBEDDED {
public:
explicit HSuccessorIterator(const HControlInstruction* instr)
: instr_(instr), current_(0) {}
bool Done() { return current_ >= instr_->SuccessorCount(); }
HBasicBlock* Current() { return instr_->SuccessorAt(current_); }
void Advance() { current_++; }
private:
const HControlInstruction* instr_;
int current_;
};
template<int S, int V>
class HTemplateControlInstruction : public HControlInstruction {
public:
int SuccessorCount() const override { return S; }
HBasicBlock* SuccessorAt(int i) const override { return successors_[i]; }
void SetSuccessorAt(int i, HBasicBlock* block) override {
successors_[i] = block;
}
int OperandCount() const override { return V; }
HValue* OperandAt(int i) const override { return inputs_[i]; }
protected:
void InternalSetOperandAt(int i, HValue* value) override {
inputs_[i] = value;
}
private:
EmbeddedContainer<HBasicBlock*, S> successors_;
EmbeddedContainer<HValue*, V> inputs_;
};
class HBlockEntry final : public HTemplateInstruction<0> {
public:
Representation RequiredInputRepresentation(int index) override {
return Representation::None();
}
DECLARE_CONCRETE_INSTRUCTION(BlockEntry)
};
class HDummyUse final : public HTemplateInstruction<1> {
public:
explicit HDummyUse(HValue* value)
: HTemplateInstruction<1>(HType::Smi()) {
SetOperandAt(0, value);
// Pretend to be a Smi so that the HChange instructions inserted
// before any use generate as little code as possible.
set_representation(Representation::Tagged());
}
HValue* value() const { return OperandAt(0); }
bool HasEscapingOperandAt(int index) override { return false; }
Representation RequiredInputRepresentation(int index) override {
return Representation::None();
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
DECLARE_CONCRETE_INSTRUCTION(DummyUse);
};
// Inserts an int3/stop break instruction for debugging purposes.
class HDebugBreak final : public HTemplateInstruction<0> {
public:
DECLARE_INSTRUCTION_FACTORY_P0(HDebugBreak);
Representation RequiredInputRepresentation(int index) override {
return Representation::None();
}
DECLARE_CONCRETE_INSTRUCTION(DebugBreak)
};
class HPrologue final : public HTemplateInstruction<0> {
public:
static HPrologue* New(Zone* zone) { return new (zone) HPrologue(); }
Representation RequiredInputRepresentation(int index) override {
return Representation::None();
}
DECLARE_CONCRETE_INSTRUCTION(Prologue)
};
class HGoto final : public HTemplateControlInstruction<1, 0> {
public:
explicit HGoto(HBasicBlock* target) {
SetSuccessorAt(0, target);
}
bool KnownSuccessorBlock(HBasicBlock** block) override {
*block = FirstSuccessor();
return true;
}
Representation RequiredInputRepresentation(int index) override {
return Representation::None();
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
DECLARE_CONCRETE_INSTRUCTION(Goto)
};
class HDeoptimize final : public HTemplateControlInstruction<1, 0> {
public:
static HDeoptimize* New(Isolate* isolate, Zone* zone, HValue* context,
Deoptimizer::DeoptReason reason,
Deoptimizer::BailoutType type,
HBasicBlock* unreachable_continuation) {
return new(zone) HDeoptimize(reason, type, unreachable_continuation);
}
bool KnownSuccessorBlock(HBasicBlock** block) override {
*block = NULL;
return true;
}
Representation RequiredInputRepresentation(int index) override {
return Representation::None();
}
Deoptimizer::DeoptReason reason() const { return reason_; }
Deoptimizer::BailoutType type() { return type_; }
DECLARE_CONCRETE_INSTRUCTION(Deoptimize)
private:
explicit HDeoptimize(Deoptimizer::DeoptReason reason,
Deoptimizer::BailoutType type,
HBasicBlock* unreachable_continuation)
: reason_(reason), type_(type) {
SetSuccessorAt(0, unreachable_continuation);
}
Deoptimizer::DeoptReason reason_;
Deoptimizer::BailoutType type_;
};
class HUnaryControlInstruction : public HTemplateControlInstruction<2, 1> {
public:
HUnaryControlInstruction(HValue* value,
HBasicBlock* true_target,
HBasicBlock* false_target) {
SetOperandAt(0, value);
SetSuccessorAt(0, true_target);
SetSuccessorAt(1, false_target);
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
HValue* value() const { return OperandAt(0); }
};
class HBranch final : public HUnaryControlInstruction {
public:
DECLARE_INSTRUCTION_FACTORY_P1(HBranch, HValue*);
DECLARE_INSTRUCTION_FACTORY_P2(HBranch, HValue*, ToBooleanICStub::Types);
DECLARE_INSTRUCTION_FACTORY_P4(HBranch, HValue*, ToBooleanICStub::Types,
HBasicBlock*, HBasicBlock*);
Representation RequiredInputRepresentation(int index) override {
return Representation::None();
}
Representation observed_input_representation(int index) override;
bool KnownSuccessorBlock(HBasicBlock** block) override;
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
ToBooleanICStub::Types expected_input_types() const {
return expected_input_types_;
}
DECLARE_CONCRETE_INSTRUCTION(Branch)
private:
HBranch(HValue* value, ToBooleanICStub::Types expected_input_types =
ToBooleanICStub::Types(),
HBasicBlock* true_target = NULL, HBasicBlock* false_target = NULL)
: HUnaryControlInstruction(value, true_target, false_target),
expected_input_types_(expected_input_types) {
SetFlag(kAllowUndefinedAsNaN);
}
ToBooleanICStub::Types expected_input_types_;
};
class HCompareMap final : public HUnaryControlInstruction {
public:
DECLARE_INSTRUCTION_FACTORY_P2(HCompareMap, HValue*, Handle<Map>);
DECLARE_INSTRUCTION_FACTORY_P4(HCompareMap, HValue*, Handle<Map>,
HBasicBlock*, HBasicBlock*);
bool KnownSuccessorBlock(HBasicBlock** block) override {
if (known_successor_index() != kNoKnownSuccessorIndex) {
*block = SuccessorAt(known_successor_index());
return true;
}
*block = NULL;
return false;
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
static const int kNoKnownSuccessorIndex = -1;
int known_successor_index() const {
return KnownSuccessorIndexField::decode(bit_field_) -
kInternalKnownSuccessorOffset;
}
void set_known_successor_index(int index) {
DCHECK(index >= 0 - kInternalKnownSuccessorOffset);
bit_field_ = KnownSuccessorIndexField::update(
bit_field_, index + kInternalKnownSuccessorOffset);
}
Unique<Map> map() const { return map_; }
bool map_is_stable() const { return MapIsStableField::decode(bit_field_); }
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
DECLARE_CONCRETE_INSTRUCTION(CompareMap)
protected:
int RedefinedOperandIndex() override { return 0; }
private:
HCompareMap(HValue* value, Handle<Map> map, HBasicBlock* true_target = NULL,
HBasicBlock* false_target = NULL)
: HUnaryControlInstruction(value, true_target, false_target),
bit_field_(KnownSuccessorIndexField::encode(
kNoKnownSuccessorIndex + kInternalKnownSuccessorOffset) |
MapIsStableField::encode(map->is_stable())),
map_(Unique<Map>::CreateImmovable(map)) {
set_representation(Representation::Tagged());
}
// BitFields can only store unsigned values, so use an offset.
// Adding kInternalKnownSuccessorOffset must yield an unsigned value.
static const int kInternalKnownSuccessorOffset = 1;
STATIC_ASSERT(kNoKnownSuccessorIndex + kInternalKnownSuccessorOffset >= 0);
class KnownSuccessorIndexField : public BitField<int, 0, 31> {};
class MapIsStableField : public BitField<bool, 31, 1> {};
uint32_t bit_field_;
Unique<Map> map_;
};
class HContext final : public HTemplateInstruction<0> {
public:
static HContext* New(Zone* zone) {
return new(zone) HContext();
}
Representation RequiredInputRepresentation(int index) override {
return Representation::None();
}
DECLARE_CONCRETE_INSTRUCTION(Context)
protected:
bool DataEquals(HValue* other) override { return true; }
private:
HContext() {
set_representation(Representation::Tagged());
SetFlag(kUseGVN);
}
bool IsDeletable() const override { return true; }
};
class HReturn final : public HTemplateControlInstruction<0, 3> {
public:
DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P2(HReturn, HValue*, HValue*);
DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P1(HReturn, HValue*);
Representation RequiredInputRepresentation(int index) override {
// TODO(titzer): require an Int32 input for faster returns.
if (index == 2) return Representation::Smi();
return Representation::Tagged();
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
HValue* value() const { return OperandAt(0); }
HValue* context() const { return OperandAt(1); }
HValue* parameter_count() const { return OperandAt(2); }
DECLARE_CONCRETE_INSTRUCTION(Return)
private:
HReturn(HValue* context, HValue* value, HValue* parameter_count = 0) {
SetOperandAt(0, value);
SetOperandAt(1, context);
SetOperandAt(2, parameter_count);
}
};
class HAbnormalExit final : public HTemplateControlInstruction<0, 0> {
public:
DECLARE_INSTRUCTION_FACTORY_P0(HAbnormalExit);
Representation RequiredInputRepresentation(int index) override {
return Representation::None();
}
DECLARE_CONCRETE_INSTRUCTION(AbnormalExit)
private:
HAbnormalExit() {}
};
class HUnaryOperation : public HTemplateInstruction<1> {
public:
explicit HUnaryOperation(HValue* value, HType type = HType::Tagged())
: HTemplateInstruction<1>(type) {
SetOperandAt(0, value);
}
static HUnaryOperation* cast(HValue* value) {
return reinterpret_cast<HUnaryOperation*>(value);
}
HValue* value() const { return OperandAt(0); }
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
};
class HUseConst final : public HUnaryOperation {
public:
DECLARE_INSTRUCTION_FACTORY_P1(HUseConst, HValue*);
Representation RequiredInputRepresentation(int index) override {
return Representation::None();
}
DECLARE_CONCRETE_INSTRUCTION(UseConst)
private:
explicit HUseConst(HValue* old_value) : HUnaryOperation(old_value) { }
};
class HForceRepresentation final : public HTemplateInstruction<1> {
public:
static HInstruction* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* value,
Representation required_representation);
HValue* value() const { return OperandAt(0); }
Representation observed_input_representation(int index) override {
// We haven't actually *observed* this, but it's closer to the truth
// than 'None'.
return representation(); // Same as the output representation.
}
Representation RequiredInputRepresentation(int index) override {
return representation(); // Same as the output representation.
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
DECLARE_CONCRETE_INSTRUCTION(ForceRepresentation)
private:
HForceRepresentation(HValue* value, Representation required_representation) {
SetOperandAt(0, value);
set_representation(required_representation);
}
};
class HChange final : public HUnaryOperation {
public:
HChange(HValue* value,
Representation to,
bool is_truncating_to_smi,
bool is_truncating_to_int32)
: HUnaryOperation(value) {
DCHECK(!value->representation().IsNone());
DCHECK(!to.IsNone());
DCHECK(!value->representation().Equals(to));
set_representation(to);
SetFlag(kUseGVN);
SetFlag(kCanOverflow);
if (is_truncating_to_smi && to.IsSmi()) {
SetFlag(kTruncatingToSmi);
SetFlag(kTruncatingToInt32);
}
if (is_truncating_to_int32) SetFlag(kTruncatingToInt32);
if (value->representation().IsSmi() || value->type().IsSmi()) {
set_type(HType::Smi());
} else {
set_type(HType::TaggedNumber());
if (to.IsTagged()) SetChangesFlag(kNewSpacePromotion);
}
}
bool can_convert_undefined_to_nan() {
return CheckUsesForFlag(kAllowUndefinedAsNaN);
}
HType CalculateInferredType() override;
HValue* Canonicalize() override;
Representation from() const { return value()->representation(); }
Representation to() const { return representation(); }
bool deoptimize_on_minus_zero() const {
return CheckFlag(kBailoutOnMinusZero);
}
Representation RequiredInputRepresentation(int index) override {
return from();
}
Range* InferRange(Zone* zone) override;
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
DECLARE_CONCRETE_INSTRUCTION(Change)
protected:
bool DataEquals(HValue* other) override { return true; }
private:
bool IsDeletable() const override {
return !from().IsTagged() || value()->type().IsSmi();
}
};
class HClampToUint8 final : public HUnaryOperation {
public:
DECLARE_INSTRUCTION_FACTORY_P1(HClampToUint8, HValue*);
Representation RequiredInputRepresentation(int index) override {
return Representation::None();
}
DECLARE_CONCRETE_INSTRUCTION(ClampToUint8)
protected:
bool DataEquals(HValue* other) override { return true; }
private:
explicit HClampToUint8(HValue* value)
: HUnaryOperation(value) {
set_representation(Representation::Integer32());
SetFlag(kAllowUndefinedAsNaN);
SetFlag(kUseGVN);
}
bool IsDeletable() const override { return true; }
};
class HDoubleBits final : public HUnaryOperation {
public:
enum Bits { HIGH, LOW };
DECLARE_INSTRUCTION_FACTORY_P2(HDoubleBits, HValue*, Bits);
Representation RequiredInputRepresentation(int index) override {
return Representation::Double();
}
DECLARE_CONCRETE_INSTRUCTION(DoubleBits)
Bits bits() { return bits_; }
protected:
bool DataEquals(HValue* other) override {
return other->IsDoubleBits() && HDoubleBits::cast(other)->bits() == bits();
}
private:
HDoubleBits(HValue* value, Bits bits)
: HUnaryOperation(value), bits_(bits) {
set_representation(Representation::Integer32());
SetFlag(kUseGVN);
}
bool IsDeletable() const override { return true; }
Bits bits_;
};
enum RemovableSimulate {
REMOVABLE_SIMULATE,
FIXED_SIMULATE
};
class HSimulate final : public HInstruction {
public:
HSimulate(BailoutId ast_id, int pop_count, Zone* zone,
RemovableSimulate removable)
: ast_id_(ast_id),
pop_count_(pop_count),
values_(2, zone),
assigned_indexes_(2, zone),
zone_(zone),
bit_field_(RemovableField::encode(removable) |
DoneWithReplayField::encode(false)) {}
~HSimulate() {}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
bool HasAstId() const { return !ast_id_.IsNone(); }
BailoutId ast_id() const { return ast_id_; }
void set_ast_id(BailoutId id) {
DCHECK(!HasAstId());
ast_id_ = id;
}
int pop_count() const { return pop_count_; }
const ZoneList<HValue*>* values() const { return &values_; }
int GetAssignedIndexAt(int index) const {
DCHECK(HasAssignedIndexAt(index));
return assigned_indexes_[index];
}
bool HasAssignedIndexAt(int index) const {
return assigned_indexes_[index] != kNoIndex;
}
void AddAssignedValue(int index, HValue* value) {
AddValue(index, value);
}
void AddPushedValue(HValue* value) {
AddValue(kNoIndex, value);
}
int ToOperandIndex(int environment_index) {
for (int i = 0; i < assigned_indexes_.length(); ++i) {
if (assigned_indexes_[i] == environment_index) return i;
}
return -1;
}
int OperandCount() const override { return values_.length(); }
HValue* OperandAt(int index) const override { return values_[index]; }
bool HasEscapingOperandAt(int index) override { return false; }
Representation RequiredInputRepresentation(int index) override {
return Representation::None();
}
void MergeWith(ZoneList<HSimulate*>* list);
bool is_candidate_for_removal() {
return RemovableField::decode(bit_field_) == REMOVABLE_SIMULATE;
}
// Replay effects of this instruction on the given environment.
void ReplayEnvironment(HEnvironment* env);
DECLARE_CONCRETE_INSTRUCTION(Simulate)
#ifdef DEBUG
void Verify() override;
void set_closure(Handle<JSFunction> closure) { closure_ = closure; }
Handle<JSFunction> closure() const { return closure_; }
#endif
protected:
void InternalSetOperandAt(int index, HValue* value) override {
values_[index] = value;
}
private:
static const int kNoIndex = -1;
void AddValue(int index, HValue* value) {
assigned_indexes_.Add(index, zone_);
// Resize the list of pushed values.
values_.Add(NULL, zone_);
// Set the operand through the base method in HValue to make sure that the
// use lists are correctly updated.
SetOperandAt(values_.length() - 1, value);
}
bool HasValueForIndex(int index) {
for (int i = 0; i < assigned_indexes_.length(); ++i) {
if (assigned_indexes_[i] == index) return true;
}
return false;
}
bool is_done_with_replay() const {
return DoneWithReplayField::decode(bit_field_);
}
void set_done_with_replay() {
bit_field_ = DoneWithReplayField::update(bit_field_, true);
}
class RemovableField : public BitField<RemovableSimulate, 0, 1> {};
class DoneWithReplayField : public BitField<bool, 1, 1> {};
BailoutId ast_id_;
int pop_count_;
ZoneList<HValue*> values_;
ZoneList<int> assigned_indexes_;
Zone* zone_;
uint32_t bit_field_;
#ifdef DEBUG
Handle<JSFunction> closure_;
#endif
};
class HEnvironmentMarker final : public HTemplateInstruction<1> {
public:
enum Kind { BIND, LOOKUP };
DECLARE_INSTRUCTION_FACTORY_P2(HEnvironmentMarker, Kind, int);
Kind kind() const { return kind_; }
int index() const { return index_; }
HSimulate* next_simulate() { return next_simulate_; }
void set_next_simulate(HSimulate* simulate) {
next_simulate_ = simulate;
}
Representation RequiredInputRepresentation(int index) override {
return Representation::None();
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
#ifdef DEBUG
void set_closure(Handle<JSFunction> closure) {
DCHECK(closure_.is_null());
DCHECK(!closure.is_null());
closure_ = closure;
}
Handle<JSFunction> closure() const { return closure_; }
#endif
DECLARE_CONCRETE_INSTRUCTION(EnvironmentMarker);
private:
HEnvironmentMarker(Kind kind, int index)
: kind_(kind), index_(index), next_simulate_(NULL) { }
Kind kind_;
int index_;
HSimulate* next_simulate_;
#ifdef DEBUG
Handle<JSFunction> closure_;
#endif
};
class HStackCheck final : public HTemplateInstruction<1> {
public:
enum Type {
kFunctionEntry,
kBackwardsBranch
};
DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P1(HStackCheck, Type);
HValue* context() { return OperandAt(0); }
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
void Eliminate() {
// The stack check eliminator might try to eliminate the same stack
// check instruction multiple times.
if (IsLinked()) {
DeleteAndReplaceWith(NULL);
}
}
bool is_function_entry() { return type_ == kFunctionEntry; }
bool is_backwards_branch() { return type_ == kBackwardsBranch; }
DECLARE_CONCRETE_INSTRUCTION(StackCheck)
private:
HStackCheck(HValue* context, Type type) : type_(type) {
SetOperandAt(0, context);
SetChangesFlag(kNewSpacePromotion);
}
Type type_;
};
enum InliningKind {
NORMAL_RETURN, // Drop the function from the environment on return.
CONSTRUCT_CALL_RETURN, // Either use allocated receiver or return value.
GETTER_CALL_RETURN, // Returning from a getter, need to restore context.
SETTER_CALL_RETURN // Use the RHS of the assignment as the return value.
};
class HArgumentsObject;
class HConstant;
class HEnterInlined final : public HTemplateInstruction<0> {
public:
static HEnterInlined* New(Isolate* isolate, Zone* zone, HValue* context,
BailoutId return_id, Handle<JSFunction> closure,
HConstant* closure_context, int arguments_count,
FunctionLiteral* function,
InliningKind inlining_kind, Variable* arguments_var,
HArgumentsObject* arguments_object,
TailCallMode syntactic_tail_call_mode) {
return new (zone)
HEnterInlined(return_id, closure, closure_context, arguments_count,
function, inlining_kind, arguments_var, arguments_object,
syntactic_tail_call_mode, zone);
}
void RegisterReturnTarget(HBasicBlock* return_target, Zone* zone);
ZoneList<HBasicBlock*>* return_targets() { return &return_targets_; }
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
Handle<SharedFunctionInfo> shared() const { return shared_; }
Handle<JSFunction> closure() const { return closure_; }
HConstant* closure_context() const { return closure_context_; }
int arguments_count() const { return arguments_count_; }
bool arguments_pushed() const { return arguments_pushed_; }
void set_arguments_pushed() { arguments_pushed_ = true; }
FunctionLiteral* function() const { return function_; }
InliningKind inlining_kind() const { return inlining_kind_; }
TailCallMode syntactic_tail_call_mode() const {
return syntactic_tail_call_mode_;
}
BailoutId ReturnId() const { return return_id_; }
int inlining_id() const { return inlining_id_; }
void set_inlining_id(int inlining_id) { inlining_id_ = inlining_id; }
Representation RequiredInputRepresentation(int index) override {
return Representation::None();
}
Variable* arguments_var() { return arguments_var_; }
HArgumentsObject* arguments_object() { return arguments_object_; }
DECLARE_CONCRETE_INSTRUCTION(EnterInlined)
private:
HEnterInlined(BailoutId return_id, Handle<JSFunction> closure,
HConstant* closure_context, int arguments_count,
FunctionLiteral* function, InliningKind inlining_kind,
Variable* arguments_var, HArgumentsObject* arguments_object,
TailCallMode syntactic_tail_call_mode, Zone* zone)
: return_id_(return_id),
shared_(handle(closure->shared())),
closure_(closure),
closure_context_(closure_context),
arguments_count_(arguments_count),
arguments_pushed_(false),
function_(function),
inlining_kind_(inlining_kind),
syntactic_tail_call_mode_(syntactic_tail_call_mode),
inlining_id_(0),
arguments_var_(arguments_var),
arguments_object_(arguments_object),
return_targets_(2, zone) {}
BailoutId return_id_;
Handle<SharedFunctionInfo> shared_;
Handle<JSFunction> closure_;
HConstant* closure_context_;
int arguments_count_;
bool arguments_pushed_;
FunctionLiteral* function_;
InliningKind inlining_kind_;
TailCallMode syntactic_tail_call_mode_;
int inlining_id_;
Variable* arguments_var_;
HArgumentsObject* arguments_object_;
ZoneList<HBasicBlock*> return_targets_;
};
class HLeaveInlined final : public HTemplateInstruction<0> {
public:
HLeaveInlined(HEnterInlined* entry,
int drop_count)
: entry_(entry),
drop_count_(drop_count) { }
Representation RequiredInputRepresentation(int index) override {
return Representation::None();
}
int argument_delta() const override {
return entry_->arguments_pushed() ? -drop_count_ : 0;
}
DECLARE_CONCRETE_INSTRUCTION(LeaveInlined)
private:
HEnterInlined* entry_;
int drop_count_;
};
class HPushArguments final : public HInstruction {
public:
static HPushArguments* New(Isolate* isolate, Zone* zone, HValue* context) {
return new(zone) HPushArguments(zone);
}
static HPushArguments* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* arg1) {
HPushArguments* instr = new(zone) HPushArguments(zone);
instr->AddInput(arg1);
return instr;
}
static HPushArguments* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* arg1, HValue* arg2) {
HPushArguments* instr = new(zone) HPushArguments(zone);
instr->AddInput(arg1);
instr->AddInput(arg2);
return instr;
}
static HPushArguments* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* arg1, HValue* arg2, HValue* arg3) {
HPushArguments* instr = new(zone) HPushArguments(zone);
instr->AddInput(arg1);
instr->AddInput(arg2);
instr->AddInput(arg3);
return instr;
}
static HPushArguments* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* arg1, HValue* arg2, HValue* arg3,
HValue* arg4) {
HPushArguments* instr = new(zone) HPushArguments(zone);
instr->AddInput(arg1);
instr->AddInput(arg2);
instr->AddInput(arg3);
instr->AddInput(arg4);
return instr;
}
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
int argument_delta() const override { return inputs_.length(); }
HValue* argument(int i) { return OperandAt(i); }
int OperandCount() const final { return inputs_.length(); }
HValue* OperandAt(int i) const final { return inputs_[i]; }
void AddInput(HValue* value);
DECLARE_CONCRETE_INSTRUCTION(PushArguments)
protected:
void InternalSetOperandAt(int i, HValue* value) final { inputs_[i] = value; }
private:
explicit HPushArguments(Zone* zone)
: HInstruction(HType::Tagged()), inputs_(4, zone) {
set_representation(Representation::Tagged());
}
ZoneList<HValue*> inputs_;
};
class HThisFunction final : public HTemplateInstruction<0> {
public:
DECLARE_INSTRUCTION_FACTORY_P0(HThisFunction);
Representation RequiredInputRepresentation(int index) override {
return Representation::None();
}
DECLARE_CONCRETE_INSTRUCTION(ThisFunction)
protected:
bool DataEquals(HValue* other) override { return true; }
private:
HThisFunction() {
set_representation(Representation::Tagged());
SetFlag(kUseGVN);
}
bool IsDeletable() const override { return true; }
};
class HDeclareGlobals final : public HUnaryOperation {
public:
DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P2(HDeclareGlobals,
Handle<FixedArray>,
int);
HValue* context() { return OperandAt(0); }
Handle<FixedArray> pairs() const { return pairs_; }
int flags() const { return flags_; }
DECLARE_CONCRETE_INSTRUCTION(DeclareGlobals)
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
private:
HDeclareGlobals(HValue* context,
Handle<FixedArray> pairs,
int flags)
: HUnaryOperation(context),
pairs_(pairs),
flags_(flags) {
set_representation(Representation::Tagged());
SetAllSideEffects();
}
Handle<FixedArray> pairs_;
int flags_;
};
template <int V>
class HCall : public HTemplateInstruction<V> {
public:
// The argument count includes the receiver.
explicit HCall<V>(int argument_count) : argument_count_(argument_count) {
this->set_representation(Representation::Tagged());
this->SetAllSideEffects();
}
virtual int argument_count() const {
return argument_count_;
}
int argument_delta() const override { return -argument_count(); }
private:
int argument_count_;
};
class HUnaryCall : public HCall<1> {
public:
HUnaryCall(HValue* value, int argument_count)
: HCall<1>(argument_count) {
SetOperandAt(0, value);
}
Representation RequiredInputRepresentation(int index) final {
return Representation::Tagged();
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
HValue* value() const { return OperandAt(0); }
};
class HBinaryCall : public HCall<2> {
public:
HBinaryCall(HValue* first, HValue* second, int argument_count)
: HCall<2>(argument_count) {
SetOperandAt(0, first);
SetOperandAt(1, second);
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
Representation RequiredInputRepresentation(int index) final {
return Representation::Tagged();
}
HValue* first() const { return OperandAt(0); }
HValue* second() const { return OperandAt(1); }
};
class HCallWithDescriptor final : public HInstruction {
public:
static HCallWithDescriptor* New(
Isolate* isolate, Zone* zone, HValue* context, HValue* target,
int argument_count, CallInterfaceDescriptor descriptor,
const Vector<HValue*>& operands,
TailCallMode syntactic_tail_call_mode = TailCallMode::kDisallow,
TailCallMode tail_call_mode = TailCallMode::kDisallow) {
HCallWithDescriptor* res = new (zone)
HCallWithDescriptor(target, argument_count, descriptor, operands,
syntactic_tail_call_mode, tail_call_mode, zone);
return res;
}
int OperandCount() const final { return values_.length(); }
HValue* OperandAt(int index) const final { return values_[index]; }
Representation RequiredInputRepresentation(int index) final {
if (index == 0 || index == 1) {
// Target + context
return Representation::Tagged();
} else {
int par_index = index - 2;
DCHECK(par_index < GetParameterCount());
return RepresentationFromType(descriptor_.GetParameterType(par_index));
}
}
DECLARE_CONCRETE_INSTRUCTION(CallWithDescriptor)
// Defines whether this instruction corresponds to a JS call at tail position.
TailCallMode syntactic_tail_call_mode() const {
return SyntacticTailCallModeField::decode(bit_field_);
}
// Defines whether this call should be generated as a tail call.
TailCallMode tail_call_mode() const {
return TailCallModeField::decode(bit_field_);
}
bool IsTailCall() const { return tail_call_mode() == TailCallMode::kAllow; }
virtual int argument_count() const {
return argument_count_;
}
int argument_delta() const override { return -argument_count_; }
CallInterfaceDescriptor descriptor() const { return descriptor_; }
HValue* target() {
return OperandAt(0);
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
private:
// The argument count includes the receiver.
HCallWithDescriptor(HValue* target, int argument_count,
CallInterfaceDescriptor descriptor,
const Vector<HValue*>& operands,
TailCallMode syntactic_tail_call_mode,
TailCallMode tail_call_mode, Zone* zone)
: descriptor_(descriptor),
values_(GetParameterCount() + 1, zone),
argument_count_(argument_count),
bit_field_(
TailCallModeField::encode(tail_call_mode) |
SyntacticTailCallModeField::encode(syntactic_tail_call_mode)) {
DCHECK_EQ(operands.length(), GetParameterCount());
// We can only tail call without any stack arguments.
DCHECK(tail_call_mode != TailCallMode::kAllow || argument_count == 0);
AddOperand(target, zone);
for (int i = 0; i < operands.length(); i++) {
AddOperand(operands[i], zone);
}
this->set_representation(Representation::Tagged());
this->SetAllSideEffects();
}
void AddOperand(HValue* v, Zone* zone) {
values_.Add(NULL, zone);
SetOperandAt(values_.length() - 1, v);
}
int GetParameterCount() const {
return descriptor_.GetRegisterParameterCount() + 1;
}
void InternalSetOperandAt(int index, HValue* value) final {
values_[index] = value;
}
CallInterfaceDescriptor descriptor_;
ZoneList<HValue*> values_;
int argument_count_;
class TailCallModeField : public BitField<TailCallMode, 0, 1> {};
class SyntacticTailCallModeField
: public BitField<TailCallMode, TailCallModeField::kNext, 1> {};
uint32_t bit_field_;
};
class HInvokeFunction final : public HBinaryCall {
public:
DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P5(HInvokeFunction, HValue*,
Handle<JSFunction>, int,
TailCallMode, TailCallMode);
HValue* context() { return first(); }
HValue* function() { return second(); }
Handle<JSFunction> known_function() { return known_function_; }
int formal_parameter_count() const { return formal_parameter_count_; }
bool HasStackCheck() final { return HasStackCheckField::decode(bit_field_); }
// Defines whether this instruction corresponds to a JS call at tail position.
TailCallMode syntactic_tail_call_mode() const {
return SyntacticTailCallModeField::decode(bit_field_);
}
// Defines whether this call should be generated as a tail call.
TailCallMode tail_call_mode() const {
return TailCallModeField::decode(bit_field_);
}
DECLARE_CONCRETE_INSTRUCTION(InvokeFunction)
std::ostream& PrintTo(std::ostream& os) const override; // NOLINT
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
private:
void set_has_stack_check(bool has_stack_check) {
bit_field_ = HasStackCheckField::update(bit_field_, has_stack_check);
}
HInvokeFunction(HValue* context, HValue* function,
Handle<JSFunction> known_function, int argument_count,
TailCallMode syntactic_tail_call_mode,
TailCallMode tail_call_mode)
: HBinaryCall(context, function, argument_count),
known_function_(known_function),
bit_field_(
TailCallModeField::encode(tail_call_mode) |
SyntacticTailCallModeField::encode(syntactic_tail_call_mode)) {
DCHECK(tail_call_mode != TailCallMode::kAllow ||
syntactic_tail_call_mode == TailCallMode::kAllow);
formal_parameter_count_ =
known_function.is_null()
? 0
: known_function->shared()->internal_formal_parameter_count();
set_has_stack_check(
!known_function.is_null() &&
(known_function->code()->kind() == Code::FUNCTION ||
known_function->code()->kind() == Code::OPTIMIZED_FUNCTION));
}
Handle<JSFunction> known_function_;
int formal_parameter_count_;
class HasStackCheckField : public BitField<bool, 0, 1> {};
class TailCallModeField
: public BitField<TailCallMode, HasStackCheckField::kNext, 1> {};
class SyntacticTailCallModeField
: public BitField<TailCallMode, TailCallModeField::kNext, 1> {};
uint32_t bit_field_;
};
class HCallNewArray final : public HBinaryCall {
public:
DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P4(HCallNewArray, HValue*, int,
ElementsKind,
Handle<AllocationSite>);
HValue* context() { return first(); }
HValue* constructor() { return second(); }
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
ElementsKind elements_kind() const { return elements_kind_; }
Handle<AllocationSite> site() const { return site_; }
DECLARE_CONCRETE_INSTRUCTION(CallNewArray)
private:
HCallNewArray(HValue* context, HValue* constructor, int argument_count,
ElementsKind elements_kind, Handle<AllocationSite> site)
: HBinaryCall(context, constructor, argument_count),
elements_kind_(elements_kind),
site_(site) {}
ElementsKind elements_kind_;
Handle<AllocationSite> site_;
};
class HCallRuntime final : public HCall<1> {
public:
DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P2(HCallRuntime,
const Runtime::Function*, int);
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
HValue* context() { return OperandAt(0); }
const Runtime::Function* function() const { return c_function_; }
SaveFPRegsMode save_doubles() const { return save_doubles_; }
void set_save_doubles(SaveFPRegsMode save_doubles) {
save_doubles_ = save_doubles;
}
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
DECLARE_CONCRETE_INSTRUCTION(CallRuntime)
private:
HCallRuntime(HValue* context, const Runtime::Function* c_function,
int argument_count)
: HCall<1>(argument_count),
c_function_(c_function),
save_doubles_(kDontSaveFPRegs) {
SetOperandAt(0, context);
}
const Runtime::Function* c_function_;
SaveFPRegsMode save_doubles_;
};
class HUnaryMathOperation final : public HTemplateInstruction<2> {
public:
static HInstruction* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* value, BuiltinFunctionId op);
HValue* context() const { return OperandAt(0); }
HValue* value() const { return OperandAt(1); }
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
Representation RequiredInputRepresentation(int index) override {
if (index == 0) {
return Representation::Tagged();
} else {
switch (op_) {
case kMathCos:
case kMathFloor:
case kMathRound:
case kMathFround:
case kMathSin:
case kMathSqrt:
case kMathPowHalf:
case kMathLog:
case kMathExp:
return Representation::Double();
case kMathAbs:
return representation();
case kMathClz32:
return Representation::Integer32();
default:
UNREACHABLE();
return Representation::None();
}
}
}
Range* InferRange(Zone* zone) override;
HValue* Canonicalize() override;
Representation RepresentationFromUses() override;
Representation RepresentationFromInputs() override;
BuiltinFunctionId op() const { return op_; }
const char* OpName() const;
DECLARE_CONCRETE_INSTRUCTION(UnaryMathOperation)
protected:
bool DataEquals(HValue* other) override {
HUnaryMathOperation* b = HUnaryMathOperation::cast(other);
return op_ == b->op();
}
private:
// Indicates if we support a double (and int32) output for Math.floor and
// Math.round.
bool SupportsFlexibleFloorAndRound() const {
#if V8_TARGET_ARCH_ARM64 || V8_TARGET_ARCH_PPC
return true;
#elif V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X64
return CpuFeatures::IsSupported(SSE4_1);
#else
return false;
#endif
}
HUnaryMathOperation(HValue* context, HValue* value, BuiltinFunctionId op)
: HTemplateInstruction<2>(HType::TaggedNumber()), op_(op) {
SetOperandAt(0, context);
SetOperandAt(1, value);
switch (op) {
case kMathFloor:
case kMathRound:
if (SupportsFlexibleFloorAndRound()) {
SetFlag(kFlexibleRepresentation);
} else {
set_representation(Representation::Integer32());
}
break;
case kMathClz32:
set_representation(Representation::Integer32());
break;
case kMathAbs:
// Not setting representation here: it is None intentionally.
SetFlag(kFlexibleRepresentation);
// TODO(svenpanne) This flag is actually only needed if representation()
// is tagged, and not when it is an unboxed double or unboxed integer.
SetChangesFlag(kNewSpacePromotion);
break;
case kMathCos:
case kMathFround:
case kMathLog:
case kMathExp:
case kMathSin:
case kMathSqrt:
case kMathPowHalf:
set_representation(Representation::Double());
break;
default:
UNREACHABLE();
}
SetFlag(kUseGVN);
SetFlag(kAllowUndefinedAsNaN);
}
bool IsDeletable() const override {
// TODO(crankshaft): This should be true, however the semantics of this
// instruction also include the ToNumber conversion that is mentioned in the
// spec, which is of course observable.
return false;
}
HValue* SimplifiedDividendForMathFloorOfDiv(HDiv* hdiv);
HValue* SimplifiedDivisorForMathFloorOfDiv(HDiv* hdiv);
BuiltinFunctionId op_;
};
class HLoadRoot final : public HTemplateInstruction<0> {
public:
DECLARE_INSTRUCTION_FACTORY_P1(HLoadRoot, Heap::RootListIndex);
DECLARE_INSTRUCTION_FACTORY_P2(HLoadRoot, Heap::RootListIndex, HType);
Representation RequiredInputRepresentation(int index) override {
return Representation::None();
}
Heap::RootListIndex index() const { return index_; }
DECLARE_CONCRETE_INSTRUCTION(LoadRoot)
protected:
bool DataEquals(HValue* other) override {
HLoadRoot* b = HLoadRoot::cast(other);
return index_ == b->index_;
}
private:
explicit HLoadRoot(Heap::RootListIndex index, HType type = HType::Tagged())
: HTemplateInstruction<0>(type), index_(index) {
SetFlag(kUseGVN);
// TODO(bmeurer): We'll need kDependsOnRoots once we add the
// corresponding HStoreRoot instruction.
SetDependsOnFlag(kCalls);
set_representation(Representation::Tagged());
}
bool IsDeletable() const override { return true; }
const Heap::RootListIndex index_;
};
class HCheckMaps final : public HTemplateInstruction<2> {
public:
static HCheckMaps* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* value, Handle<Map> map,
HValue* typecheck = NULL) {
return new(zone) HCheckMaps(value, new(zone) UniqueSet<Map>(
Unique<Map>::CreateImmovable(map), zone), typecheck);
}
static HCheckMaps* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* value, SmallMapList* map_list,
HValue* typecheck = NULL) {
UniqueSet<Map>* maps = new(zone) UniqueSet<Map>(map_list->length(), zone);
for (int i = 0; i < map_list->length(); ++i) {
maps->Add(Unique<Map>::CreateImmovable(map_list->at(i)), zone);
}
return new(zone) HCheckMaps(value, maps, typecheck);
}
bool IsStabilityCheck() const {
return IsStabilityCheckField::decode(bit_field_);
}
void MarkAsStabilityCheck() {
bit_field_ = MapsAreStableField::encode(true) |
HasMigrationTargetField::encode(false) |
IsStabilityCheckField::encode(true);
ClearChangesFlag(kNewSpacePromotion);
ClearDependsOnFlag(kElementsKind);
ClearDependsOnFlag(kMaps);
}
bool HasEscapingOperandAt(int index) override { return false; }
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
HType CalculateInferredType() override {
if (value()->type().IsHeapObject()) return value()->type();
return HType::HeapObject();
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
HValue* value() const { return OperandAt(0); }
HValue* typecheck() const { return OperandAt(1); }
const UniqueSet<Map>* maps() const { return maps_; }
void set_maps(const UniqueSet<Map>* maps) { maps_ = maps; }
bool maps_are_stable() const {
return MapsAreStableField::decode(bit_field_);
}
bool HasMigrationTarget() const {
return HasMigrationTargetField::decode(bit_field_);
}
HValue* Canonicalize() override;
static HCheckMaps* CreateAndInsertAfter(Zone* zone,
HValue* value,
Unique<Map> map,
bool map_is_stable,
HInstruction* instr) {
return instr->Append(new(zone) HCheckMaps(
value, new(zone) UniqueSet<Map>(map, zone), map_is_stable));
}
static HCheckMaps* CreateAndInsertBefore(Zone* zone,
HValue* value,
const UniqueSet<Map>* maps,
bool maps_are_stable,
HInstruction* instr) {
return instr->Prepend(new(zone) HCheckMaps(value, maps, maps_are_stable));
}
DECLARE_CONCRETE_INSTRUCTION(CheckMaps)
protected:
bool DataEquals(HValue* other) override {
return this->maps()->Equals(HCheckMaps::cast(other)->maps());
}
int RedefinedOperandIndex() override { return 0; }
private:
HCheckMaps(HValue* value, const UniqueSet<Map>* maps, bool maps_are_stable)
: HTemplateInstruction<2>(HType::HeapObject()),
maps_(maps),
bit_field_(HasMigrationTargetField::encode(false) |
IsStabilityCheckField::encode(false) |
MapsAreStableField::encode(maps_are_stable)) {
DCHECK_NE(0, maps->size());
SetOperandAt(0, value);
// Use the object value for the dependency.
SetOperandAt(1, value);
set_representation(Representation::Tagged());
SetFlag(kUseGVN);
SetDependsOnFlag(kMaps);
SetDependsOnFlag(kElementsKind);
}
HCheckMaps(HValue* value, const UniqueSet<Map>* maps, HValue* typecheck)
: HTemplateInstruction<2>(HType::HeapObject()),
maps_(maps),
bit_field_(HasMigrationTargetField::encode(false) |
IsStabilityCheckField::encode(false) |
MapsAreStableField::encode(true)) {
DCHECK_NE(0, maps->size());
SetOperandAt(0, value);
// Use the object value for the dependency if NULL is passed.
SetOperandAt(1, typecheck ? typecheck : value);
set_representation(Representation::Tagged());
SetFlag(kUseGVN);
SetDependsOnFlag(kMaps);
SetDependsOnFlag(kElementsKind);
for (int i = 0; i < maps->size(); ++i) {
Handle<Map> map = maps->at(i).handle();
if (map->is_migration_target()) {
bit_field_ = HasMigrationTargetField::update(bit_field_, true);
}
if (!map->is_stable()) {
bit_field_ = MapsAreStableField::update(bit_field_, false);
}
}
if (HasMigrationTarget()) SetChangesFlag(kNewSpacePromotion);
}
class HasMigrationTargetField : public BitField<bool, 0, 1> {};
class IsStabilityCheckField : public BitField<bool, 1, 1> {};
class MapsAreStableField : public BitField<bool, 2, 1> {};
const UniqueSet<Map>* maps_;
uint32_t bit_field_;
};
class HCheckValue final : public HUnaryOperation {
public:
static HCheckValue* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* value, Handle<JSFunction> func) {
bool in_new_space = isolate->heap()->InNewSpace(*func);
// NOTE: We create an uninitialized Unique and initialize it later.
// This is because a JSFunction can move due to GC during graph creation.
Unique<JSFunction> target = Unique<JSFunction>::CreateUninitialized(func);
HCheckValue* check = new(zone) HCheckValue(value, target, in_new_space);
return check;
}
static HCheckValue* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* value, Unique<HeapObject> target,
bool object_in_new_space) {
return new(zone) HCheckValue(value, target, object_in_new_space);
}
void FinalizeUniqueness() override {
object_ = Unique<HeapObject>(object_.handle());
}
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
HValue* Canonicalize() override;
#ifdef DEBUG
void Verify() override;
#endif
Unique<HeapObject> object() const { return object_; }
bool object_in_new_space() const { return object_in_new_space_; }
DECLARE_CONCRETE_INSTRUCTION(CheckValue)
protected:
bool DataEquals(HValue* other) override {
HCheckValue* b = HCheckValue::cast(other);
return object_ == b->object_;
}
private:
HCheckValue(HValue* value, Unique<HeapObject> object,
bool object_in_new_space)
: HUnaryOperation(value, value->type()),
object_(object),
object_in_new_space_(object_in_new_space) {
set_representation(Representation::Tagged());
SetFlag(kUseGVN);
}
Unique<HeapObject> object_;
bool object_in_new_space_;
};
class HCheckInstanceType final : public HUnaryOperation {
public:
enum Check {
IS_JS_RECEIVER,
IS_JS_ARRAY,
IS_JS_FUNCTION,
IS_JS_DATE,
IS_STRING,
IS_INTERNALIZED_STRING,
LAST_INTERVAL_CHECK = IS_JS_DATE
};
DECLARE_INSTRUCTION_FACTORY_P2(HCheckInstanceType, HValue*, Check);
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
HType CalculateInferredType() override {
switch (check_) {
case IS_JS_RECEIVER: return HType::JSReceiver();
case IS_JS_ARRAY: return HType::JSArray();
case IS_JS_FUNCTION:
return HType::JSObject();
case IS_JS_DATE: return HType::JSObject();
case IS_STRING: return HType::String();
case IS_INTERNALIZED_STRING: return HType::String();
}
UNREACHABLE();
return HType::Tagged();
}
HValue* Canonicalize() override;
bool is_interval_check() const { return check_ <= LAST_INTERVAL_CHECK; }
void GetCheckInterval(InstanceType* first, InstanceType* last);
void GetCheckMaskAndTag(uint8_t* mask, uint8_t* tag);
Check check() const { return check_; }
DECLARE_CONCRETE_INSTRUCTION(CheckInstanceType)
protected:
// TODO(ager): It could be nice to allow the ommision of instance
// type checks if we have already performed an instance type check
// with a larger range.
bool DataEquals(HValue* other) override {
HCheckInstanceType* b = HCheckInstanceType::cast(other);
return check_ == b->check_;
}
int RedefinedOperandIndex() override { return 0; }
private:
const char* GetCheckName() const;
HCheckInstanceType(HValue* value, Check check)
: HUnaryOperation(value, HType::HeapObject()), check_(check) {
set_representation(Representation::Tagged());
SetFlag(kUseGVN);
}
const Check check_;
};
class HCheckSmi final : public HUnaryOperation {
public:
DECLARE_INSTRUCTION_FACTORY_P1(HCheckSmi, HValue*);
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
HValue* Canonicalize() override {
HType value_type = value()->type();
if (value_type.IsSmi()) {
return NULL;
}
return this;
}
DECLARE_CONCRETE_INSTRUCTION(CheckSmi)
protected:
bool DataEquals(HValue* other) override { return true; }
private:
explicit HCheckSmi(HValue* value) : HUnaryOperation(value, HType::Smi()) {
set_representation(Representation::Smi());
SetFlag(kUseGVN);
}
};
class HCheckArrayBufferNotNeutered final : public HUnaryOperation {
public:
DECLARE_INSTRUCTION_FACTORY_P1(HCheckArrayBufferNotNeutered, HValue*);
bool HasEscapingOperandAt(int index) override { return false; }
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
HType CalculateInferredType() override {
if (value()->type().IsHeapObject()) return value()->type();
return HType::HeapObject();
}
DECLARE_CONCRETE_INSTRUCTION(CheckArrayBufferNotNeutered)
protected:
bool DataEquals(HValue* other) override { return true; }
int RedefinedOperandIndex() override { return 0; }
private:
explicit HCheckArrayBufferNotNeutered(HValue* value)
: HUnaryOperation(value) {
set_representation(Representation::Tagged());
SetFlag(kUseGVN);
SetDependsOnFlag(kCalls);
}
};
class HCheckHeapObject final : public HUnaryOperation {
public:
DECLARE_INSTRUCTION_FACTORY_P1(HCheckHeapObject, HValue*);
bool HasEscapingOperandAt(int index) override { return false; }
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
HType CalculateInferredType() override {
if (value()->type().IsHeapObject()) return value()->type();
return HType::HeapObject();
}
#ifdef DEBUG
void Verify() override;
#endif
HValue* Canonicalize() override {
return value()->type().IsHeapObject() ? NULL : this;
}
DECLARE_CONCRETE_INSTRUCTION(CheckHeapObject)
protected:
bool DataEquals(HValue* other) override { return true; }
private:
explicit HCheckHeapObject(HValue* value) : HUnaryOperation(value) {
set_representation(Representation::Tagged());
SetFlag(kUseGVN);
}
};
class HPhi final : public HValue {
public:
HPhi(int merged_index, Zone* zone)
: inputs_(2, zone), merged_index_(merged_index) {
DCHECK(merged_index >= 0 || merged_index == kInvalidMergedIndex);
SetFlag(kFlexibleRepresentation);
SetFlag(kAllowUndefinedAsNaN);
}
Representation RepresentationFromInputs() override;
Range* InferRange(Zone* zone) override;
void InferRepresentation(HInferRepresentationPhase* h_infer) override;
Representation RequiredInputRepresentation(int index) override {
return representation();
}
Representation KnownOptimalRepresentation() override {
return representation();
}
HType CalculateInferredType() override;
int OperandCount() const override { return inputs_.length(); }
HValue* OperandAt(int index) const override { return inputs_[index]; }
HValue* GetRedundantReplacement();
void AddInput(HValue* value);
bool HasRealUses();
bool IsReceiver() const { return merged_index_ == 0; }
bool HasMergedIndex() const { return merged_index_ != kInvalidMergedIndex; }
SourcePosition position() const override;
int merged_index() const { return merged_index_; }
std::ostream& PrintTo(std::ostream& os) const override; // NOLINT
#ifdef DEBUG
void Verify() override;
#endif
void InitRealUses(int id);
void AddNonPhiUsesFrom(HPhi* other);
Representation representation_from_indirect_uses() const {
return representation_from_indirect_uses_;
}
bool has_type_feedback_from_uses() const {
return has_type_feedback_from_uses_;
}
int phi_id() { return phi_id_; }
static HPhi* cast(HValue* value) {
DCHECK(value->IsPhi());
return reinterpret_cast<HPhi*>(value);
}
Opcode opcode() const override { return HValue::kPhi; }
void SimplifyConstantInputs();
// Marker value representing an invalid merge index.
static const int kInvalidMergedIndex = -1;
protected:
void DeleteFromGraph() override;
void InternalSetOperandAt(int index, HValue* value) override {
inputs_[index] = value;
}
private:
Representation representation_from_non_phi_uses() const {
return representation_from_non_phi_uses_;
}
ZoneList<HValue*> inputs_;
int merged_index_ = 0;
int phi_id_ = -1;
Representation representation_from_indirect_uses_ = Representation::None();
Representation representation_from_non_phi_uses_ = Representation::None();
bool has_type_feedback_from_uses_ = false;
bool IsDeletable() const override { return !IsReceiver(); }
};
// Common base class for HArgumentsObject and HCapturedObject.
class HDematerializedObject : public HInstruction {
public:
HDematerializedObject(int count, Zone* zone) : values_(count, zone) {}
int OperandCount() const final { return values_.length(); }
HValue* OperandAt(int index) const final { return values_[index]; }
bool HasEscapingOperandAt(int index) final { return false; }
Representation RequiredInputRepresentation(int index) final {
return Representation::None();
}
protected:
void InternalSetOperandAt(int index, HValue* value) final {
values_[index] = value;
}
// List of values tracked by this marker.
ZoneList<HValue*> values_;
};
class HArgumentsObject final : public HDematerializedObject {
public:
static HArgumentsObject* New(Isolate* isolate, Zone* zone, HValue* context,
int count) {
return new(zone) HArgumentsObject(count, zone);
}
// The values contain a list of all elements in the arguments object
// including the receiver object, which is skipped when materializing.
const ZoneList<HValue*>* arguments_values() const { return &values_; }
int arguments_count() const { return values_.length(); }
void AddArgument(HValue* argument, Zone* zone) {
values_.Add(NULL, zone); // Resize list.
SetOperandAt(values_.length() - 1, argument);
}
DECLARE_CONCRETE_INSTRUCTION(ArgumentsObject)
private:
HArgumentsObject(int count, Zone* zone)
: HDematerializedObject(count, zone) {
set_representation(Representation::Tagged());
SetFlag(kIsArguments);
}
};
class HCapturedObject final : public HDematerializedObject {
public:
HCapturedObject(int length, int id, Zone* zone)
: HDematerializedObject(length, zone), capture_id_(id) {
set_representation(Representation::Tagged());
values_.AddBlock(NULL, length, zone); // Resize list.
}
// The values contain a list of all in-object properties inside the
// captured object and is index by field index. Properties in the
// properties or elements backing store are not tracked here.
const ZoneList<HValue*>* values() const { return &values_; }
int length() const { return values_.length(); }
int capture_id() const { return capture_id_; }
// Shortcut for the map value of this captured object.
HValue* map_value() const { return values()->first(); }
void ReuseSideEffectsFromStore(HInstruction* store) {
DCHECK(store->HasObservableSideEffects());
DCHECK(store->IsStoreNamedField());
changes_flags_.Add(store->ChangesFlags());
}
// Replay effects of this instruction on the given environment.
void ReplayEnvironment(HEnvironment* env);
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
DECLARE_CONCRETE_INSTRUCTION(CapturedObject)
private:
int capture_id_;
// Note that we cannot DCE captured objects as they are used to replay
// the environment. This method is here as an explicit reminder.
// TODO(mstarzinger): Turn HSimulates into full snapshots maybe?
bool IsDeletable() const final { return false; }
};
class HConstant final : public HTemplateInstruction<0> {
public:
enum Special { kHoleNaN };
DECLARE_INSTRUCTION_FACTORY_P1(HConstant, Special);
DECLARE_INSTRUCTION_FACTORY_P1(HConstant, int32_t);
DECLARE_INSTRUCTION_FACTORY_P2(HConstant, int32_t, Representation);
DECLARE_INSTRUCTION_FACTORY_P1(HConstant, double);
DECLARE_INSTRUCTION_FACTORY_P1(HConstant, Handle<Object>);
DECLARE_INSTRUCTION_FACTORY_P1(HConstant, ExternalReference);
static HConstant* CreateAndInsertAfter(Isolate* isolate, Zone* zone,
HValue* context, int32_t value,
Representation representation,
HInstruction* instruction) {
return instruction->Append(
HConstant::New(isolate, zone, context, value, representation));
}
Handle<Map> GetMonomorphicJSObjectMap() override {
Handle<Object> object = object_.handle();
if (!object.is_null() && object->IsHeapObject()) {
return v8::internal::handle(HeapObject::cast(*object)->map());
}
return Handle<Map>();
}
static HConstant* CreateAndInsertBefore(Isolate* isolate, Zone* zone,
HValue* context, int32_t value,
Representation representation,
HInstruction* instruction) {
return instruction->Prepend(
HConstant::New(isolate, zone, context, value, representation));
}
static HConstant* CreateAndInsertBefore(Zone* zone,
Unique<Map> map,
bool map_is_stable,
HInstruction* instruction) {
return instruction->Prepend(new(zone) HConstant(
map, Unique<Map>(Handle<Map>::null()), map_is_stable,
Representation::Tagged(), HType::HeapObject(), true,
false, false, MAP_TYPE));
}
static HConstant* CreateAndInsertAfter(Zone* zone,
Unique<Map> map,
bool map_is_stable,
HInstruction* instruction) {
return instruction->Append(new(zone) HConstant(
map, Unique<Map>(Handle<Map>::null()), map_is_stable,
Representation::Tagged(), HType::HeapObject(), true,
false, false, MAP_TYPE));
}
Handle<Object> handle(Isolate* isolate) {
if (object_.handle().is_null()) {
// Default arguments to is_not_in_new_space depend on this heap number
// to be tenured so that it's guaranteed not to be located in new space.
object_ = Unique<Object>::CreateUninitialized(
isolate->factory()->NewNumber(double_value_, TENURED));
}
AllowDeferredHandleDereference smi_check;
DCHECK(HasInteger32Value() || !object_.handle()->IsSmi());
return object_.handle();
}
bool IsSpecialDouble() const {
return HasDoubleValue() &&
(bit_cast<int64_t>(double_value_) == bit_cast<int64_t>(-0.0) ||
std::isnan(double_value_));
}
bool NotInNewSpace() const {
return IsNotInNewSpaceField::decode(bit_field_);
}
bool ImmortalImmovable() const;
bool IsCell() const {
InstanceType instance_type = GetInstanceType();
return instance_type == CELL_TYPE;
}
Representation RequiredInputRepresentation(int index) override {
return Representation::None();
}
Representation KnownOptimalRepresentation() override {
if (HasSmiValue() && SmiValuesAre31Bits()) return Representation::Smi();
if (HasInteger32Value()) return Representation::Integer32();
if (HasNumberValue()) return Representation::Double();
if (HasExternalReferenceValue()) return Representation::External();
return Representation::Tagged();
}
bool EmitAtUses() override;
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
HConstant* CopyToRepresentation(Representation r, Zone* zone) const;
Maybe<HConstant*> CopyToTruncatedInt32(Zone* zone);
Maybe<HConstant*> CopyToTruncatedNumber(Isolate* isolate, Zone* zone);
bool HasInteger32Value() const {
return HasInt32ValueField::decode(bit_field_);
}
int32_t Integer32Value() const {
DCHECK(HasInteger32Value());
return int32_value_;
}
bool HasSmiValue() const { return HasSmiValueField::decode(bit_field_); }
bool HasDoubleValue() const {
return HasDoubleValueField::decode(bit_field_);
}
double DoubleValue() const {
DCHECK(HasDoubleValue());
return double_value_;
}
uint64_t DoubleValueAsBits() const {
uint64_t bits;
DCHECK(HasDoubleValue());
STATIC_ASSERT(sizeof(bits) == sizeof(double_value_));
std::memcpy(&bits, &double_value_, sizeof(bits));
return bits;
}
bool IsTheHole() const {
if (HasDoubleValue() && DoubleValueAsBits() == kHoleNanInt64) {
return true;
}
return object_.IsInitialized() &&
object_.IsKnownGlobal(isolate()->heap()->the_hole_value());
}
bool HasNumberValue() const { return HasDoubleValue(); }
int32_t NumberValueAsInteger32() const {
DCHECK(HasNumberValue());
// Irrespective of whether a numeric HConstant can be safely
// represented as an int32, we store the (in some cases lossy)
// representation of the number in int32_value_.
return int32_value_;
}
bool HasStringValue() const {
if (HasNumberValue()) return false;
DCHECK(!object_.handle().is_null());
return GetInstanceType() < FIRST_NONSTRING_TYPE;
}
Handle<String> StringValue() const {
DCHECK(HasStringValue());
return Handle<String>::cast(object_.handle());
}
bool HasInternalizedStringValue() const {
return HasStringValue() && StringShape(GetInstanceType()).IsInternalized();
}
bool HasExternalReferenceValue() const {
return HasExternalReferenceValueField::decode(bit_field_);
}
ExternalReference ExternalReferenceValue() const {
return external_reference_value_;
}
bool HasBooleanValue() const { return type_.IsBoolean(); }
bool BooleanValue() const { return BooleanValueField::decode(bit_field_); }
bool IsCallable() const { return IsCallableField::decode(bit_field_); }
bool IsUndetectable() const {
return IsUndetectableField::decode(bit_field_);
}
InstanceType GetInstanceType() const {
return InstanceTypeField::decode(bit_field_);
}
bool HasMapValue() const { return GetInstanceType() == MAP_TYPE; }
Unique<Map> MapValue() const {
DCHECK(HasMapValue());
return Unique<Map>::cast(GetUnique());
}
bool HasStableMapValue() const {
DCHECK(HasMapValue() || !HasStableMapValueField::decode(bit_field_));
return HasStableMapValueField::decode(bit_field_);
}
bool HasObjectMap() const { return !object_map_.IsNull(); }
Unique<Map> ObjectMap() const {
DCHECK(HasObjectMap());
return object_map_;
}
intptr_t Hashcode() override {
if (HasInteger32Value()) {
return static_cast<intptr_t>(int32_value_);
} else if (HasDoubleValue()) {
uint64_t bits = DoubleValueAsBits();
if (sizeof(bits) > sizeof(intptr_t)) {
bits ^= (bits >> 32);
}
return static_cast<intptr_t>(bits);
} else if (HasExternalReferenceValue()) {
return reinterpret_cast<intptr_t>(external_reference_value_.address());
} else {
DCHECK(!object_.handle().is_null());
return object_.Hashcode();
}
}
void FinalizeUniqueness() override {
if (!HasDoubleValue() && !HasExternalReferenceValue()) {
DCHECK(!object_.handle().is_null());
object_ = Unique<Object>(object_.handle());
}
}
Unique<Object> GetUnique() const {
return object_;
}
bool EqualsUnique(Unique<Object> other) const {
return object_.IsInitialized() && object_ == other;
}
bool DataEquals(HValue* other) override {
HConstant* other_constant = HConstant::cast(other);
if (HasInteger32Value()) {
return other_constant->HasInteger32Value() &&
int32_value_ == other_constant->int32_value_;
} else if (HasDoubleValue()) {
return other_constant->HasDoubleValue() &&
std::memcmp(&double_value_, &other_constant->double_value_,
sizeof(double_value_)) == 0;
} else if (HasExternalReferenceValue()) {
return other_constant->HasExternalReferenceValue() &&
external_reference_value_ ==
other_constant->external_reference_value_;
} else {
if (other_constant->HasInteger32Value() ||
other_constant->HasDoubleValue() ||
other_constant->HasExternalReferenceValue()) {
return false;
}
DCHECK(!object_.handle().is_null());
return other_constant->object_ == object_;
}
}
#ifdef DEBUG
void Verify() override {}
#endif
DECLARE_CONCRETE_INSTRUCTION(Constant)
protected:
Range* InferRange(Zone* zone) override;
private:
friend class HGraph;
explicit HConstant(Special special);
explicit HConstant(Handle<Object> handle,
Representation r = Representation::None());
HConstant(int32_t value,
Representation r = Representation::None(),
bool is_not_in_new_space = true,
Unique<Object> optional = Unique<Object>(Handle<Object>::null()));
HConstant(double value,
Representation r = Representation::None(),
bool is_not_in_new_space = true,
Unique<Object> optional = Unique<Object>(Handle<Object>::null()));
HConstant(Unique<Object> object,
Unique<Map> object_map,
bool has_stable_map_value,
Representation r,
HType type,
bool is_not_in_new_space,
bool boolean_value,
bool is_undetectable,
InstanceType instance_type);
explicit HConstant(ExternalReference reference);
void Initialize(Representation r);
bool IsDeletable() const override { return true; }
// If object_ is a map, this indicates whether the map is stable.
class HasStableMapValueField : public BitField<bool, 0, 1> {};
// We store the HConstant in the most specific form safely possible.
// These flags tell us if the respective member fields hold valid, safe
// representations of the constant. More specific flags imply more general
// flags, but not the converse (i.e. smi => int32 => double).
class HasSmiValueField : public BitField<bool, 1, 1> {};
class HasInt32ValueField : public BitField<bool, 2, 1> {};
class HasDoubleValueField : public BitField<bool, 3, 1> {};
class HasExternalReferenceValueField : public BitField<bool, 4, 1> {};
class IsNotInNewSpaceField : public BitField<bool, 5, 1> {};
class BooleanValueField : public BitField<bool, 6, 1> {};
class IsUndetectableField : public BitField<bool, 7, 1> {};
class IsCallableField : public BitField<bool, 8, 1> {};
static const InstanceType kUnknownInstanceType = FILLER_TYPE;
class InstanceTypeField : public BitField<InstanceType, 16, 8> {};
// If this is a numerical constant, object_ either points to the
// HeapObject the constant originated from or is null. If the
// constant is non-numeric, object_ always points to a valid
// constant HeapObject.
Unique<Object> object_;
// If object_ is a heap object, this points to the stable map of the object.
Unique<Map> object_map_;
uint32_t bit_field_;
int32_t int32_value_;
double double_value_;
ExternalReference external_reference_value_;
};
class HBinaryOperation : public HTemplateInstruction<3> {
public:
HBinaryOperation(HValue* context, HValue* left, HValue* right,
HType type = HType::Tagged())
: HTemplateInstruction<3>(type),
observed_output_representation_(Representation::None()) {
DCHECK(left != NULL && right != NULL);
SetOperandAt(0, context);
SetOperandAt(1, left);
SetOperandAt(2, right);
observed_input_representation_[0] = Representation::None();
observed_input_representation_[1] = Representation::None();
}
HValue* context() const { return OperandAt(0); }
HValue* left() const { return OperandAt(1); }
HValue* right() const { return OperandAt(2); }
// True if switching left and right operands likely generates better code.
bool AreOperandsBetterSwitched() {
if (!IsCommutative()) return false;
// Constant operands are better off on the right, they can be inlined in
// many situations on most platforms.
if (left()->IsConstant()) return true;
if (right()->IsConstant()) return false;
// Otherwise, if there is only one use of the right operand, it would be
// better off on the left for platforms that only have 2-arg arithmetic
// ops (e.g ia32, x64) that clobber the left operand.
return right()->HasOneUse();
}
HValue* BetterLeftOperand() {
return AreOperandsBetterSwitched() ? right() : left();
}
HValue* BetterRightOperand() {
return AreOperandsBetterSwitched() ? left() : right();
}
void set_observed_input_representation(int index, Representation rep) {
DCHECK(index >= 1 && index <= 2);
observed_input_representation_[index - 1] = rep;
}
virtual void initialize_output_representation(Representation observed) {
observed_output_representation_ = observed;
}
Representation observed_input_representation(int index) override {
if (index == 0) return Representation::Tagged();
return observed_input_representation_[index - 1];
}
void UpdateRepresentation(Representation new_rep,
HInferRepresentationPhase* h_infer,
const char* reason) override {
Representation rep = !FLAG_smi_binop && new_rep.IsSmi()
? Representation::Integer32() : new_rep;
HValue::UpdateRepresentation(rep, h_infer, reason);
}
void InferRepresentation(HInferRepresentationPhase* h_infer) override;
Representation RepresentationFromInputs() override;
Representation RepresentationFromOutput();
void AssumeRepresentation(Representation r) override;
virtual bool IsCommutative() const { return false; }
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
Representation RequiredInputRepresentation(int index) override {
if (index == 0) return Representation::Tagged();
return representation();
}
void SetOperandPositions(Zone* zone, SourcePosition left_pos,
SourcePosition right_pos) {
set_operand_position(zone, 1, left_pos);
set_operand_position(zone, 2, right_pos);
}
bool RightIsPowerOf2() {
if (!right()->IsInteger32Constant()) return false;
int32_t value = right()->GetInteger32Constant();
if (value < 0) {
return base::bits::IsPowerOfTwo32(static_cast<uint32_t>(-value));
}
return base::bits::IsPowerOfTwo32(static_cast<uint32_t>(value));
}
DECLARE_ABSTRACT_INSTRUCTION(BinaryOperation)
private:
bool IgnoreObservedOutputRepresentation(Representation current_rep);
Representation observed_input_representation_[2];
Representation observed_output_representation_;
};
class HWrapReceiver final : public HTemplateInstruction<2> {
public:
DECLARE_INSTRUCTION_FACTORY_P2(HWrapReceiver, HValue*, HValue*);
bool DataEquals(HValue* other) override { return true; }
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
HValue* receiver() const { return OperandAt(0); }
HValue* function() const { return OperandAt(1); }
HValue* Canonicalize() override;
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
bool known_function() const { return known_function_; }
DECLARE_CONCRETE_INSTRUCTION(WrapReceiver)
private:
HWrapReceiver(HValue* receiver, HValue* function) {
known_function_ = function->IsConstant() &&
HConstant::cast(function)->handle(function->isolate())->IsJSFunction();
set_representation(Representation::Tagged());
SetOperandAt(0, receiver);
SetOperandAt(1, function);
SetFlag(kUseGVN);
}
bool known_function_;
};
class HApplyArguments final : public HTemplateInstruction<4> {
public:
DECLARE_INSTRUCTION_FACTORY_P5(HApplyArguments, HValue*, HValue*, HValue*,
HValue*, TailCallMode);
Representation RequiredInputRepresentation(int index) override {
// The length is untagged, all other inputs are tagged.
return (index == 2)
? Representation::Integer32()
: Representation::Tagged();
}
HValue* function() { return OperandAt(0); }
HValue* receiver() { return OperandAt(1); }
HValue* length() { return OperandAt(2); }
HValue* elements() { return OperandAt(3); }
TailCallMode tail_call_mode() const {
return TailCallModeField::decode(bit_field_);
}
DECLARE_CONCRETE_INSTRUCTION(ApplyArguments)
private:
HApplyArguments(HValue* function, HValue* receiver, HValue* length,
HValue* elements, TailCallMode tail_call_mode)
: bit_field_(TailCallModeField::encode(tail_call_mode)) {
set_representation(Representation::Tagged());
SetOperandAt(0, function);
SetOperandAt(1, receiver);
SetOperandAt(2, length);
SetOperandAt(3, elements);
SetAllSideEffects();
}
class TailCallModeField : public BitField<TailCallMode, 0, 1> {};
uint32_t bit_field_;
};
class HArgumentsElements final : public HTemplateInstruction<0> {
public:
DECLARE_INSTRUCTION_FACTORY_P1(HArgumentsElements, bool);
DECLARE_INSTRUCTION_FACTORY_P2(HArgumentsElements, bool, bool);
DECLARE_CONCRETE_INSTRUCTION(ArgumentsElements)
Representation RequiredInputRepresentation(int index) override {
return Representation::None();
}
bool from_inlined() const { return from_inlined_; }
bool arguments_adaptor() const { return arguments_adaptor_; }
protected:
bool DataEquals(HValue* other) override { return true; }
private:
explicit HArgumentsElements(bool from_inlined, bool arguments_adaptor = true)
: from_inlined_(from_inlined), arguments_adaptor_(arguments_adaptor) {
// The value produced by this instruction is a pointer into the stack
// that looks as if it was a smi because of alignment.
set_representation(Representation::Tagged());
SetFlag(kUseGVN);
}
bool IsDeletable() const override { return true; }
bool from_inlined_;
bool arguments_adaptor_;
};
class HArgumentsLength final : public HUnaryOperation {
public:
DECLARE_INSTRUCTION_FACTORY_P1(HArgumentsLength, HValue*);
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
DECLARE_CONCRETE_INSTRUCTION(ArgumentsLength)
protected:
bool DataEquals(HValue* other) override { return true; }
private:
explicit HArgumentsLength(HValue* value) : HUnaryOperation(value) {
set_representation(Representation::Integer32());
SetFlag(kUseGVN);
}
bool IsDeletable() const override { return true; }
};
class HAccessArgumentsAt final : public HTemplateInstruction<3> {
public:
DECLARE_INSTRUCTION_FACTORY_P3(HAccessArgumentsAt, HValue*, HValue*, HValue*);
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
Representation RequiredInputRepresentation(int index) override {
// The arguments elements is considered tagged.
return index == 0
? Representation::Tagged()
: Representation::Integer32();
}
HValue* arguments() const { return OperandAt(0); }
HValue* length() const { return OperandAt(1); }
HValue* index() const { return OperandAt(2); }
DECLARE_CONCRETE_INSTRUCTION(AccessArgumentsAt)
private:
HAccessArgumentsAt(HValue* arguments, HValue* length, HValue* index) {
set_representation(Representation::Tagged());
SetFlag(kUseGVN);
SetOperandAt(0, arguments);
SetOperandAt(1, length);
SetOperandAt(2, index);
}
bool DataEquals(HValue* other) override { return true; }
};
class HBoundsCheck final : public HTemplateInstruction<2> {
public:
DECLARE_INSTRUCTION_FACTORY_P2(HBoundsCheck, HValue*, HValue*);
bool skip_check() const { return skip_check_; }
void set_skip_check() { skip_check_ = true; }
HValue* base() const { return base_; }
int offset() const { return offset_; }
int scale() const { return scale_; }
Representation RequiredInputRepresentation(int index) override {
return representation();
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
void InferRepresentation(HInferRepresentationPhase* h_infer) override;
HValue* index() const { return OperandAt(0); }
HValue* length() const { return OperandAt(1); }
bool allow_equality() const { return allow_equality_; }
void set_allow_equality(bool v) { allow_equality_ = v; }
int RedefinedOperandIndex() override { return 0; }
bool IsPurelyInformativeDefinition() override { return skip_check(); }
DECLARE_CONCRETE_INSTRUCTION(BoundsCheck)
protected:
Range* InferRange(Zone* zone) override;
bool DataEquals(HValue* other) override { return true; }
bool skip_check_;
HValue* base_;
int offset_;
int scale_;
bool allow_equality_;
private:
// Normally HBoundsCheck should be created using the
// HGraphBuilder::AddBoundsCheck() helper.
// However when building stubs, where we know that the arguments are Int32,
// it makes sense to invoke this constructor directly.
HBoundsCheck(HValue* index, HValue* length)
: skip_check_(false),
base_(NULL), offset_(0), scale_(0),
allow_equality_(false) {
SetOperandAt(0, index);
SetOperandAt(1, length);
SetFlag(kFlexibleRepresentation);
SetFlag(kUseGVN);
}
bool IsDeletable() const override { return skip_check() && !FLAG_debug_code; }
};
class HBitwiseBinaryOperation : public HBinaryOperation {
public:
HBitwiseBinaryOperation(HValue* context, HValue* left, HValue* right,
HType type = HType::TaggedNumber())
: HBinaryOperation(context, left, right, type) {
SetFlag(kFlexibleRepresentation);
SetFlag(kTruncatingToInt32);
SetFlag(kAllowUndefinedAsNaN);
SetAllSideEffects();
}
void RepresentationChanged(Representation to) override {
if (to.IsTagged() &&
(left()->ToNumberCanBeObserved() || right()->ToNumberCanBeObserved())) {
SetAllSideEffects();
ClearFlag(kUseGVN);
} else {
ClearAllSideEffects();
SetFlag(kUseGVN);
}
if (to.IsTagged()) SetChangesFlag(kNewSpacePromotion);
}
void UpdateRepresentation(Representation new_rep,
HInferRepresentationPhase* h_infer,
const char* reason) override {
// We only generate either int32 or generic tagged bitwise operations.
if (new_rep.IsDouble()) new_rep = Representation::Integer32();
HBinaryOperation::UpdateRepresentation(new_rep, h_infer, reason);
}
Representation observed_input_representation(int index) override {
Representation r = HBinaryOperation::observed_input_representation(index);
if (r.IsDouble()) return Representation::Integer32();
return r;
}
void initialize_output_representation(Representation observed) override {
if (observed.IsDouble()) observed = Representation::Integer32();
HBinaryOperation::initialize_output_representation(observed);
}
DECLARE_ABSTRACT_INSTRUCTION(BitwiseBinaryOperation)
private:
bool IsDeletable() const override { return true; }
};
class HMathFloorOfDiv final : public HBinaryOperation {
public:
DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P2(HMathFloorOfDiv,
HValue*,
HValue*);
DECLARE_CONCRETE_INSTRUCTION(MathFloorOfDiv)
protected:
bool DataEquals(HValue* other) override { return true; }
private:
HMathFloorOfDiv(HValue* context, HValue* left, HValue* right)
: HBinaryOperation(context, left, right) {
set_representation(Representation::Integer32());
SetFlag(kUseGVN);
SetFlag(kCanOverflow);
SetFlag(kCanBeDivByZero);
SetFlag(kLeftCanBeMinInt);
SetFlag(kLeftCanBeNegative);
SetFlag(kLeftCanBePositive);
SetFlag(kAllowUndefinedAsNaN);
}
Range* InferRange(Zone* zone) override;
bool IsDeletable() const override { return true; }
};
class HArithmeticBinaryOperation : public HBinaryOperation {
public:
HArithmeticBinaryOperation(HValue* context, HValue* left, HValue* right)
: HBinaryOperation(context, left, right, HType::TaggedNumber()) {
SetAllSideEffects();
SetFlag(kFlexibleRepresentation);
SetFlag(kAllowUndefinedAsNaN);
}
void RepresentationChanged(Representation to) override {
if (to.IsTagged() &&
(left()->ToNumberCanBeObserved() || right()->ToNumberCanBeObserved())) {
SetAllSideEffects();
ClearFlag(kUseGVN);
} else {
ClearAllSideEffects();
SetFlag(kUseGVN);
}
if (to.IsTagged()) SetChangesFlag(kNewSpacePromotion);
}
DECLARE_ABSTRACT_INSTRUCTION(ArithmeticBinaryOperation)
private:
bool IsDeletable() const override { return true; }
};
class HCompareGeneric final : public HBinaryOperation {
public:
static HCompareGeneric* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* left, HValue* right, Token::Value token) {
return new (zone) HCompareGeneric(context, left, right, token);
}
Representation RequiredInputRepresentation(int index) override {
return index == 0
? Representation::Tagged()
: representation();
}
Token::Value token() const { return token_; }
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
DECLARE_CONCRETE_INSTRUCTION(CompareGeneric)
private:
HCompareGeneric(HValue* context, HValue* left, HValue* right,
Token::Value token)
: HBinaryOperation(context, left, right, HType::Boolean()),
token_(token) {
DCHECK(Token::IsCompareOp(token));
set_representation(Representation::Tagged());
SetAllSideEffects();
}
Token::Value token_;
};
class HCompareNumericAndBranch : public HTemplateControlInstruction<2, 2> {
public:
static HCompareNumericAndBranch* New(Isolate* isolate, Zone* zone,
HValue* context, HValue* left,
HValue* right, Token::Value token,
HBasicBlock* true_target = NULL,
HBasicBlock* false_target = NULL) {
return new (zone)
HCompareNumericAndBranch(left, right, token, true_target, false_target);
}
HValue* left() const { return OperandAt(0); }
HValue* right() const { return OperandAt(1); }
Token::Value token() const { return token_; }
void set_observed_input_representation(Representation left,
Representation right) {
observed_input_representation_[0] = left;
observed_input_representation_[1] = right;
}
void InferRepresentation(HInferRepresentationPhase* h_infer) override;
Representation RequiredInputRepresentation(int index) override {
return representation();
}
Representation observed_input_representation(int index) override {
return observed_input_representation_[index];
}
bool KnownSuccessorBlock(HBasicBlock** block) override;
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
void SetOperandPositions(Zone* zone, SourcePosition left_pos,
SourcePosition right_pos) {
set_operand_position(zone, 0, left_pos);
set_operand_position(zone, 1, right_pos);
}
DECLARE_CONCRETE_INSTRUCTION(CompareNumericAndBranch)
private:
HCompareNumericAndBranch(HValue* left, HValue* right, Token::Value token,
HBasicBlock* true_target, HBasicBlock* false_target)
: token_(token) {
SetFlag(kFlexibleRepresentation);
DCHECK(Token::IsCompareOp(token));
SetOperandAt(0, left);
SetOperandAt(1, right);
SetSuccessorAt(0, true_target);
SetSuccessorAt(1, false_target);
}
Representation observed_input_representation_[2];
Token::Value token_;
};
class HCompareHoleAndBranch final : public HUnaryControlInstruction {
public:
DECLARE_INSTRUCTION_FACTORY_P1(HCompareHoleAndBranch, HValue*);
DECLARE_INSTRUCTION_FACTORY_P3(HCompareHoleAndBranch, HValue*,
HBasicBlock*, HBasicBlock*);
void InferRepresentation(HInferRepresentationPhase* h_infer) override;
Representation RequiredInputRepresentation(int index) override {
return representation();
}
DECLARE_CONCRETE_INSTRUCTION(CompareHoleAndBranch)
private:
HCompareHoleAndBranch(HValue* value,
HBasicBlock* true_target = NULL,
HBasicBlock* false_target = NULL)
: HUnaryControlInstruction(value, true_target, false_target) {
SetFlag(kFlexibleRepresentation);
SetFlag(kAllowUndefinedAsNaN);
}
};
class HCompareObjectEqAndBranch : public HTemplateControlInstruction<2, 2> {
public:
DECLARE_INSTRUCTION_FACTORY_P2(HCompareObjectEqAndBranch, HValue*, HValue*);
DECLARE_INSTRUCTION_FACTORY_P4(HCompareObjectEqAndBranch, HValue*, HValue*,
HBasicBlock*, HBasicBlock*);
bool KnownSuccessorBlock(HBasicBlock** block) override;
static const int kNoKnownSuccessorIndex = -1;
int known_successor_index() const { return known_successor_index_; }
void set_known_successor_index(int known_successor_index) {
known_successor_index_ = known_successor_index;
}
HValue* left() const { return OperandAt(0); }
HValue* right() const { return OperandAt(1); }
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
Representation observed_input_representation(int index) override {
return Representation::Tagged();
}
DECLARE_CONCRETE_INSTRUCTION(CompareObjectEqAndBranch)
private:
HCompareObjectEqAndBranch(HValue* left,
HValue* right,
HBasicBlock* true_target = NULL,
HBasicBlock* false_target = NULL)
: known_successor_index_(kNoKnownSuccessorIndex) {
SetOperandAt(0, left);
SetOperandAt(1, right);
SetSuccessorAt(0, true_target);
SetSuccessorAt(1, false_target);
}
int known_successor_index_;
};
class HIsStringAndBranch final : public HUnaryControlInstruction {
public:
DECLARE_INSTRUCTION_FACTORY_P1(HIsStringAndBranch, HValue*);
DECLARE_INSTRUCTION_FACTORY_P3(HIsStringAndBranch, HValue*,
HBasicBlock*, HBasicBlock*);
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
bool KnownSuccessorBlock(HBasicBlock** block) override;
static const int kNoKnownSuccessorIndex = -1;
int known_successor_index() const { return known_successor_index_; }
void set_known_successor_index(int known_successor_index) {
known_successor_index_ = known_successor_index;
}
DECLARE_CONCRETE_INSTRUCTION(IsStringAndBranch)
protected:
int RedefinedOperandIndex() override { return 0; }
private:
HIsStringAndBranch(HValue* value, HBasicBlock* true_target = NULL,
HBasicBlock* false_target = NULL)
: HUnaryControlInstruction(value, true_target, false_target),
known_successor_index_(kNoKnownSuccessorIndex) {
set_representation(Representation::Tagged());
}
int known_successor_index_;
};
class HIsSmiAndBranch final : public HUnaryControlInstruction {
public:
DECLARE_INSTRUCTION_FACTORY_P1(HIsSmiAndBranch, HValue*);
DECLARE_INSTRUCTION_FACTORY_P3(HIsSmiAndBranch, HValue*,
HBasicBlock*, HBasicBlock*);
DECLARE_CONCRETE_INSTRUCTION(IsSmiAndBranch)
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
protected:
bool DataEquals(HValue* other) override { return true; }
int RedefinedOperandIndex() override { return 0; }
private:
HIsSmiAndBranch(HValue* value,
HBasicBlock* true_target = NULL,
HBasicBlock* false_target = NULL)
: HUnaryControlInstruction(value, true_target, false_target) {
set_representation(Representation::Tagged());
}
};
class HIsUndetectableAndBranch final : public HUnaryControlInstruction {
public:
DECLARE_INSTRUCTION_FACTORY_P1(HIsUndetectableAndBranch, HValue*);
DECLARE_INSTRUCTION_FACTORY_P3(HIsUndetectableAndBranch, HValue*,
HBasicBlock*, HBasicBlock*);
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
bool KnownSuccessorBlock(HBasicBlock** block) override;
DECLARE_CONCRETE_INSTRUCTION(IsUndetectableAndBranch)
private:
HIsUndetectableAndBranch(HValue* value,
HBasicBlock* true_target = NULL,
HBasicBlock* false_target = NULL)
: HUnaryControlInstruction(value, true_target, false_target) {}
};
class HStringCompareAndBranch final : public HTemplateControlInstruction<2, 3> {
public:
DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P3(HStringCompareAndBranch,
HValue*,
HValue*,
Token::Value);
HValue* context() const { return OperandAt(0); }
HValue* left() const { return OperandAt(1); }
HValue* right() const { return OperandAt(2); }
Token::Value token() const { return token_; }
std::ostream& PrintDataTo(std::ostream& os) const final; // NOLINT
Representation RequiredInputRepresentation(int index) final {
return Representation::Tagged();
}
DECLARE_CONCRETE_INSTRUCTION(StringCompareAndBranch)
private:
HStringCompareAndBranch(HValue* context, HValue* left, HValue* right,
Token::Value token)
: token_(token) {
DCHECK(Token::IsCompareOp(token));
SetOperandAt(0, context);
SetOperandAt(1, left);
SetOperandAt(2, right);
set_representation(Representation::Tagged());
SetChangesFlag(kNewSpacePromotion);
SetDependsOnFlag(kStringChars);
SetDependsOnFlag(kStringLengths);
}
Token::Value const token_;
};
class HHasInstanceTypeAndBranch final : public HUnaryControlInstruction {
public:
DECLARE_INSTRUCTION_FACTORY_P2(
HHasInstanceTypeAndBranch, HValue*, InstanceType);
DECLARE_INSTRUCTION_FACTORY_P3(
HHasInstanceTypeAndBranch, HValue*, InstanceType, InstanceType);
InstanceType from() { return from_; }
InstanceType to() { return to_; }
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
bool KnownSuccessorBlock(HBasicBlock** block) override;
DECLARE_CONCRETE_INSTRUCTION(HasInstanceTypeAndBranch)
private:
HHasInstanceTypeAndBranch(HValue* value, InstanceType type)
: HUnaryControlInstruction(value, NULL, NULL), from_(type), to_(type) { }
HHasInstanceTypeAndBranch(HValue* value, InstanceType from, InstanceType to)
: HUnaryControlInstruction(value, NULL, NULL), from_(from), to_(to) {
DCHECK(to == LAST_TYPE); // Others not implemented yet in backend.
}
InstanceType from_;
InstanceType to_; // Inclusive range, not all combinations work.
};
class HHasCachedArrayIndexAndBranch final : public HUnaryControlInstruction {
public:
DECLARE_INSTRUCTION_FACTORY_P1(HHasCachedArrayIndexAndBranch, HValue*);
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
DECLARE_CONCRETE_INSTRUCTION(HasCachedArrayIndexAndBranch)
private:
explicit HHasCachedArrayIndexAndBranch(HValue* value)
: HUnaryControlInstruction(value, NULL, NULL) { }
};
class HGetCachedArrayIndex final : public HUnaryOperation {
public:
DECLARE_INSTRUCTION_FACTORY_P1(HGetCachedArrayIndex, HValue*);
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
DECLARE_CONCRETE_INSTRUCTION(GetCachedArrayIndex)
protected:
bool DataEquals(HValue* other) override { return true; }
private:
explicit HGetCachedArrayIndex(HValue* value) : HUnaryOperation(value) {
set_representation(Representation::Tagged());
SetFlag(kUseGVN);
}
bool IsDeletable() const override { return true; }
};
class HClassOfTestAndBranch final : public HUnaryControlInstruction {
public:
DECLARE_INSTRUCTION_FACTORY_P2(HClassOfTestAndBranch, HValue*,
Handle<String>);
DECLARE_CONCRETE_INSTRUCTION(ClassOfTestAndBranch)
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
Handle<String> class_name() const { return class_name_; }
private:
HClassOfTestAndBranch(HValue* value, Handle<String> class_name)
: HUnaryControlInstruction(value, NULL, NULL),
class_name_(class_name) { }
Handle<String> class_name_;
};
class HTypeofIsAndBranch final : public HUnaryControlInstruction {
public:
DECLARE_INSTRUCTION_FACTORY_P2(HTypeofIsAndBranch, HValue*, Handle<String>);
Handle<String> type_literal() const { return type_literal_.handle(); }
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
DECLARE_CONCRETE_INSTRUCTION(TypeofIsAndBranch)
Representation RequiredInputRepresentation(int index) override {
return Representation::None();
}
bool KnownSuccessorBlock(HBasicBlock** block) override;
void FinalizeUniqueness() override {
type_literal_ = Unique<String>(type_literal_.handle());
}
private:
HTypeofIsAndBranch(HValue* value, Handle<String> type_literal)
: HUnaryControlInstruction(value, NULL, NULL),
type_literal_(Unique<String>::CreateUninitialized(type_literal)) { }
Unique<String> type_literal_;
};
class HHasInPrototypeChainAndBranch final
: public HTemplateControlInstruction<2, 2> {
public:
DECLARE_INSTRUCTION_FACTORY_P2(HHasInPrototypeChainAndBranch, HValue*,
HValue*);
HValue* object() const { return OperandAt(0); }
HValue* prototype() const { return OperandAt(1); }
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
bool ObjectNeedsSmiCheck() const {
return !object()->type().IsHeapObject() &&
!object()->representation().IsHeapObject();
}
DECLARE_CONCRETE_INSTRUCTION(HasInPrototypeChainAndBranch)
private:
HHasInPrototypeChainAndBranch(HValue* object, HValue* prototype) {
SetOperandAt(0, object);
SetOperandAt(1, prototype);
SetDependsOnFlag(kCalls);
}
};
class HPower final : public HTemplateInstruction<2> {
public:
static HInstruction* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* left, HValue* right);
HValue* left() { return OperandAt(0); }
HValue* right() const { return OperandAt(1); }
Representation RequiredInputRepresentation(int index) override {
return index == 0
? Representation::Double()
: Representation::None();
}
Representation observed_input_representation(int index) override {
return RequiredInputRepresentation(index);
}
DECLARE_CONCRETE_INSTRUCTION(Power)
protected:
bool DataEquals(HValue* other) override { return true; }
private:
HPower(HValue* left, HValue* right) {
SetOperandAt(0, left);
SetOperandAt(1, right);
set_representation(Representation::Double());
SetFlag(kUseGVN);
SetChangesFlag(kNewSpacePromotion);
}
bool IsDeletable() const override {
return !right()->representation().IsTagged();
}
};
enum ExternalAddType {
AddOfExternalAndTagged,
AddOfExternalAndInt32,
NoExternalAdd
};
class HAdd final : public HArithmeticBinaryOperation {
public:
static HInstruction* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* left, HValue* right);
static HInstruction* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* left, HValue* right,
ExternalAddType external_add_type);
// Add is only commutative if two integer values are added and not if two
// tagged values are added (because it might be a String concatenation).
// We also do not commute (pointer + offset).
bool IsCommutative() const override {
return !representation().IsTagged() && !representation().IsExternal();
}
HValue* Canonicalize() override;
void RepresentationChanged(Representation to) override {
if (to.IsTagged() &&
(left()->ToNumberCanBeObserved() || right()->ToNumberCanBeObserved() ||
left()->ToStringCanBeObserved() || right()->ToStringCanBeObserved())) {
SetAllSideEffects();
ClearFlag(kUseGVN);
} else {
ClearAllSideEffects();
SetFlag(kUseGVN);
}
if (to.IsTagged()) {
SetChangesFlag(kNewSpacePromotion);
ClearFlag(kAllowUndefinedAsNaN);
}
if (!right()->type().IsTaggedNumber() &&
!right()->representation().IsDouble() &&
!right()->representation().IsSmiOrInteger32()) {
ClearFlag(kAllowUndefinedAsNaN);
}
}
Representation RepresentationFromInputs() override;
Representation RequiredInputRepresentation(int index) override;
bool IsConsistentExternalRepresentation() {
return left()->representation().IsExternal() &&
((external_add_type_ == AddOfExternalAndInt32 &&
right()->representation().IsInteger32()) ||
(external_add_type_ == AddOfExternalAndTagged &&
right()->representation().IsTagged()));
}
ExternalAddType external_add_type() const { return external_add_type_; }
DECLARE_CONCRETE_INSTRUCTION(Add)
protected:
bool DataEquals(HValue* other) override { return true; }
Range* InferRange(Zone* zone) override;
private:
HAdd(HValue* context, HValue* left, HValue* right,
ExternalAddType external_add_type = NoExternalAdd)
: HArithmeticBinaryOperation(context, left, right),
external_add_type_(external_add_type) {
SetFlag(kCanOverflow);
switch (external_add_type_) {
case AddOfExternalAndTagged:
DCHECK(left->representation().IsExternal());
DCHECK(right->representation().IsTagged());
SetDependsOnFlag(kNewSpacePromotion);
ClearFlag(HValue::kCanOverflow);
SetFlag(kHasNoObservableSideEffects);
break;
case NoExternalAdd:
// This is a bit of a hack: The call to this constructor is generated
// by a macro that also supports sub and mul, so it doesn't pass in
// a value for external_add_type but uses the default.
if (left->representation().IsExternal()) {
external_add_type_ = AddOfExternalAndInt32;
}
break;
case AddOfExternalAndInt32:
// See comment above.
UNREACHABLE();
break;
}
}
ExternalAddType external_add_type_;
};
class HSub final : public HArithmeticBinaryOperation {
public:
static HInstruction* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* left, HValue* right);
HValue* Canonicalize() override;
DECLARE_CONCRETE_INSTRUCTION(Sub)
protected:
bool DataEquals(HValue* other) override { return true; }
Range* InferRange(Zone* zone) override;
private:
HSub(HValue* context, HValue* left, HValue* right)
: HArithmeticBinaryOperation(context, left, right) {
SetFlag(kCanOverflow);
}
};
class HMul final : public HArithmeticBinaryOperation {
public:
static HInstruction* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* left, HValue* right);
static HInstruction* NewImul(Isolate* isolate, Zone* zone, HValue* context,
HValue* left, HValue* right) {
HInstruction* instr = HMul::New(isolate, zone, context, left, right);
if (!instr->IsMul()) return instr;
HMul* mul = HMul::cast(instr);
// TODO(mstarzinger): Prevent bailout on minus zero for imul.
mul->AssumeRepresentation(Representation::Integer32());
mul->ClearFlag(HValue::kCanOverflow);
return mul;
}
HValue* Canonicalize() override;
// Only commutative if it is certain that not two objects are multiplicated.
bool IsCommutative() const override { return !representation().IsTagged(); }
void UpdateRepresentation(Representation new_rep,
HInferRepresentationPhase* h_infer,
const char* reason) override {
HArithmeticBinaryOperation::UpdateRepresentation(new_rep, h_infer, reason);
}
bool MulMinusOne();
DECLARE_CONCRETE_INSTRUCTION(Mul)
protected:
bool DataEquals(HValue* other) override { return true; }
Range* InferRange(Zone* zone) override;
private:
HMul(HValue* context, HValue* left, HValue* right)
: HArithmeticBinaryOperation(context, left, right) {
SetFlag(kCanOverflow);
}
};
class HMod final : public HArithmeticBinaryOperation {
public:
static HInstruction* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* left, HValue* right);
HValue* Canonicalize() override;
void UpdateRepresentation(Representation new_rep,
HInferRepresentationPhase* h_infer,
const char* reason) override {
if (new_rep.IsSmi()) new_rep = Representation::Integer32();
HArithmeticBinaryOperation::UpdateRepresentation(new_rep, h_infer, reason);
}
DECLARE_CONCRETE_INSTRUCTION(Mod)
protected:
bool DataEquals(HValue* other) override { return true; }
Range* InferRange(Zone* zone) override;
private:
HMod(HValue* context, HValue* left, HValue* right)
: HArithmeticBinaryOperation(context, left, right) {
SetFlag(kCanBeDivByZero);
SetFlag(kCanOverflow);
SetFlag(kLeftCanBeNegative);
}
};
class HDiv final : public HArithmeticBinaryOperation {
public:
static HInstruction* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* left, HValue* right);
HValue* Canonicalize() override;
void UpdateRepresentation(Representation new_rep,
HInferRepresentationPhase* h_infer,
const char* reason) override {
if (new_rep.IsSmi()) new_rep = Representation::Integer32();
HArithmeticBinaryOperation::UpdateRepresentation(new_rep, h_infer, reason);
}
DECLARE_CONCRETE_INSTRUCTION(Div)
protected:
bool DataEquals(HValue* other) override { return true; }
Range* InferRange(Zone* zone) override;
private:
HDiv(HValue* context, HValue* left, HValue* right)
: HArithmeticBinaryOperation(context, left, right) {
SetFlag(kCanBeDivByZero);
SetFlag(kCanOverflow);
}
};
class HMathMinMax final : public HArithmeticBinaryOperation {
public:
enum Operation { kMathMin, kMathMax };
static HInstruction* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* left, HValue* right, Operation op);
Representation observed_input_representation(int index) override {
return RequiredInputRepresentation(index);
}
void InferRepresentation(HInferRepresentationPhase* h_infer) override;
Representation RepresentationFromInputs() override {
Representation left_rep = left()->representation();
Representation right_rep = right()->representation();
Representation result = Representation::Smi();
result = result.generalize(left_rep);
result = result.generalize(right_rep);
if (result.IsTagged()) return Representation::Double();
return result;
}
bool IsCommutative() const override { return true; }
Operation operation() { return operation_; }
DECLARE_CONCRETE_INSTRUCTION(MathMinMax)
protected:
bool DataEquals(HValue* other) override {
return other->IsMathMinMax() &&
HMathMinMax::cast(other)->operation_ == operation_;
}
Range* InferRange(Zone* zone) override;
private:
HMathMinMax(HValue* context, HValue* left, HValue* right, Operation op)
: HArithmeticBinaryOperation(context, left, right), operation_(op) {}
Operation operation_;
};
class HBitwise final : public HBitwiseBinaryOperation {
public:
static HInstruction* New(Isolate* isolate, Zone* zone, HValue* context,
Token::Value op, HValue* left, HValue* right);
Token::Value op() const { return op_; }
bool IsCommutative() const override { return true; }
HValue* Canonicalize() override;
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
DECLARE_CONCRETE_INSTRUCTION(Bitwise)
protected:
bool DataEquals(HValue* other) override {
return op() == HBitwise::cast(other)->op();
}
Range* InferRange(Zone* zone) override;
private:
HBitwise(HValue* context, Token::Value op, HValue* left, HValue* right)
: HBitwiseBinaryOperation(context, left, right), op_(op) {
DCHECK(op == Token::BIT_AND || op == Token::BIT_OR || op == Token::BIT_XOR);
// BIT_AND with a smi-range positive value will always unset the
// entire sign-extension of the smi-sign.
if (op == Token::BIT_AND &&
((left->IsConstant() &&
left->representation().IsSmi() &&
HConstant::cast(left)->Integer32Value() >= 0) ||
(right->IsConstant() &&
right->representation().IsSmi() &&
HConstant::cast(right)->Integer32Value() >= 0))) {
SetFlag(kTruncatingToSmi);
SetFlag(kTruncatingToInt32);
// BIT_OR with a smi-range negative value will always set the entire
// sign-extension of the smi-sign.
} else if (op == Token::BIT_OR &&
((left->IsConstant() &&
left->representation().IsSmi() &&
HConstant::cast(left)->Integer32Value() < 0) ||
(right->IsConstant() &&
right->representation().IsSmi() &&
HConstant::cast(right)->Integer32Value() < 0))) {
SetFlag(kTruncatingToSmi);
SetFlag(kTruncatingToInt32);
}
}
Token::Value op_;
};
class HShl final : public HBitwiseBinaryOperation {
public:
static HInstruction* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* left, HValue* right);
Range* InferRange(Zone* zone) override;
void UpdateRepresentation(Representation new_rep,
HInferRepresentationPhase* h_infer,
const char* reason) override {
if (new_rep.IsSmi() &&
!(right()->IsInteger32Constant() &&
right()->GetInteger32Constant() >= 0)) {
new_rep = Representation::Integer32();
}
HBitwiseBinaryOperation::UpdateRepresentation(new_rep, h_infer, reason);
}
DECLARE_CONCRETE_INSTRUCTION(Shl)
protected:
bool DataEquals(HValue* other) override { return true; }
private:
HShl(HValue* context, HValue* left, HValue* right)
: HBitwiseBinaryOperation(context, left, right) {}
};
class HShr final : public HBitwiseBinaryOperation {
public:
static HInstruction* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* left, HValue* right);
Range* InferRange(Zone* zone) override;
void UpdateRepresentation(Representation new_rep,
HInferRepresentationPhase* h_infer,
const char* reason) override {
if (new_rep.IsSmi()) new_rep = Representation::Integer32();
HBitwiseBinaryOperation::UpdateRepresentation(new_rep, h_infer, reason);
}
DECLARE_CONCRETE_INSTRUCTION(Shr)
protected:
bool DataEquals(HValue* other) override { return true; }
private:
HShr(HValue* context, HValue* left, HValue* right)
: HBitwiseBinaryOperation(context, left, right) {}
};
class HSar final : public HBitwiseBinaryOperation {
public:
static HInstruction* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* left, HValue* right);
Range* InferRange(Zone* zone) override;
void UpdateRepresentation(Representation new_rep,
HInferRepresentationPhase* h_infer,
const char* reason) override {
if (new_rep.IsSmi()) new_rep = Representation::Integer32();
HBitwiseBinaryOperation::UpdateRepresentation(new_rep, h_infer, reason);
}
DECLARE_CONCRETE_INSTRUCTION(Sar)
protected:
bool DataEquals(HValue* other) override { return true; }
private:
HSar(HValue* context, HValue* left, HValue* right)
: HBitwiseBinaryOperation(context, left, right) {}
};
class HRor final : public HBitwiseBinaryOperation {
public:
static HInstruction* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* left, HValue* right) {
return new (zone) HRor(context, left, right);
}
void UpdateRepresentation(Representation new_rep,
HInferRepresentationPhase* h_infer,
const char* reason) override {
if (new_rep.IsSmi()) new_rep = Representation::Integer32();
HBitwiseBinaryOperation::UpdateRepresentation(new_rep, h_infer, reason);
}
DECLARE_CONCRETE_INSTRUCTION(Ror)
protected:
bool DataEquals(HValue* other) override { return true; }
private:
HRor(HValue* context, HValue* left, HValue* right)
: HBitwiseBinaryOperation(context, left, right) {
ChangeRepresentation(Representation::Integer32());
}
};
class HOsrEntry final : public HTemplateInstruction<0> {
public:
DECLARE_INSTRUCTION_FACTORY_P1(HOsrEntry, BailoutId);
BailoutId ast_id() const { return ast_id_; }
Representation RequiredInputRepresentation(int index) override {
return Representation::None();
}
DECLARE_CONCRETE_INSTRUCTION(OsrEntry)
private:
explicit HOsrEntry(BailoutId ast_id) : ast_id_(ast_id) {
SetChangesFlag(kOsrEntries);
SetChangesFlag(kNewSpacePromotion);
}
BailoutId ast_id_;
};
class HParameter final : public HTemplateInstruction<0> {
public:
enum ParameterKind {
STACK_PARAMETER,
REGISTER_PARAMETER
};
DECLARE_INSTRUCTION_FACTORY_P1(HParameter, unsigned);
DECLARE_INSTRUCTION_FACTORY_P2(HParameter, unsigned, ParameterKind);
DECLARE_INSTRUCTION_FACTORY_P3(HParameter, unsigned, ParameterKind,
Representation);
unsigned index() const { return index_; }
ParameterKind kind() const { return kind_; }
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
Representation RequiredInputRepresentation(int index) override {
return Representation::None();
}
Representation KnownOptimalRepresentation() override {
// If a parameter is an input to a phi, that phi should not
// choose any more optimistic representation than Tagged.
return Representation::Tagged();
}
DECLARE_CONCRETE_INSTRUCTION(Parameter)
private:
explicit HParameter(unsigned index,
ParameterKind kind = STACK_PARAMETER)
: index_(index),
kind_(kind) {
set_representation(Representation::Tagged());
}
explicit HParameter(unsigned index,
ParameterKind kind,
Representation r)
: index_(index),
kind_(kind) {
set_representation(r);
}
unsigned index_;
ParameterKind kind_;
};
class HUnknownOSRValue final : public HTemplateInstruction<0> {
public:
DECLARE_INSTRUCTION_FACTORY_P2(HUnknownOSRValue, HEnvironment*, int);
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
Representation RequiredInputRepresentation(int index) override {
return Representation::None();
}
void set_incoming_value(HPhi* value) { incoming_value_ = value; }
HPhi* incoming_value() { return incoming_value_; }
HEnvironment *environment() { return environment_; }
int index() { return index_; }
Representation KnownOptimalRepresentation() override {
if (incoming_value_ == NULL) return Representation::None();
return incoming_value_->KnownOptimalRepresentation();
}
DECLARE_CONCRETE_INSTRUCTION(UnknownOSRValue)
private:
HUnknownOSRValue(HEnvironment* environment, int index)
: environment_(environment),
index_(index),
incoming_value_(NULL) {
set_representation(Representation::Tagged());
}
HEnvironment* environment_;
int index_;
HPhi* incoming_value_;
};
class HLoadGlobalGeneric final : public HTemplateInstruction<1> {
public:
DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P4(HLoadGlobalGeneric,
Handle<String>, TypeofMode,
Handle<TypeFeedbackVector>,
FeedbackVectorSlot);
HValue* context() { return OperandAt(0); }
Handle<String> name() const { return name_; }
TypeofMode typeof_mode() const { return typeof_mode_; }
FeedbackVectorSlot slot() const { return slot_; }
Handle<TypeFeedbackVector> feedback_vector() const {
return feedback_vector_;
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
DECLARE_CONCRETE_INSTRUCTION(LoadGlobalGeneric)
private:
HLoadGlobalGeneric(HValue* context, Handle<String> name,
TypeofMode typeof_mode, Handle<TypeFeedbackVector> vector,
FeedbackVectorSlot slot)
: name_(name),
typeof_mode_(typeof_mode),
feedback_vector_(vector),
slot_(slot) {
SetOperandAt(0, context);
set_representation(Representation::Tagged());
SetAllSideEffects();
}
Handle<String> name_;
TypeofMode typeof_mode_;
Handle<TypeFeedbackVector> feedback_vector_;
FeedbackVectorSlot slot_;
};
class HAllocate final : public HTemplateInstruction<3> {
public:
static bool CompatibleInstanceTypes(InstanceType type1,
InstanceType type2) {
return ComputeFlags(TENURED, type1) == ComputeFlags(TENURED, type2) &&
ComputeFlags(NOT_TENURED, type1) == ComputeFlags(NOT_TENURED, type2);
}
static HAllocate* New(
Isolate* isolate, Zone* zone, HValue* context, HValue* size, HType type,
PretenureFlag pretenure_flag, InstanceType instance_type,
HValue* dominator,
Handle<AllocationSite> allocation_site = Handle<AllocationSite>::null()) {
return new (zone) HAllocate(context, size, type, pretenure_flag,
instance_type, dominator, allocation_site);
}
// Maximum instance size for which allocations will be inlined.
static const int kMaxInlineSize = 64 * kPointerSize;
HValue* context() const { return OperandAt(0); }
HValue* size() const { return OperandAt(1); }
HValue* allocation_folding_dominator() const { return OperandAt(2); }
Representation RequiredInputRepresentation(int index) override {
if (index == 0) {
return Representation::Tagged();
} else {
return Representation::Integer32();
}
}
Handle<Map> GetMonomorphicJSObjectMap() override {
return known_initial_map_;
}
void set_known_initial_map(Handle<Map> known_initial_map) {
known_initial_map_ = known_initial_map;
}
bool IsNewSpaceAllocation() const {
return (flags_ & ALLOCATE_IN_NEW_SPACE) != 0;
}
bool IsOldSpaceAllocation() const {
return (flags_ & ALLOCATE_IN_OLD_SPACE) != 0;
}
bool MustAllocateDoubleAligned() const {
return (flags_ & ALLOCATE_DOUBLE_ALIGNED) != 0;
}
bool MustPrefillWithFiller() const {
return (flags_ & PREFILL_WITH_FILLER) != 0;
}
void MakePrefillWithFiller() {
flags_ = static_cast<HAllocate::Flags>(flags_ | PREFILL_WITH_FILLER);
}
void MakeDoubleAligned() {
flags_ = static_cast<HAllocate::Flags>(flags_ | ALLOCATE_DOUBLE_ALIGNED);
}
void MakeAllocationFoldingDominator() {
flags_ =
static_cast<HAllocate::Flags>(flags_ | ALLOCATION_FOLDING_DOMINATOR);
}
bool IsAllocationFoldingDominator() {
return (flags_ & ALLOCATION_FOLDING_DOMINATOR) != 0;
}
void MakeFoldedAllocation(HAllocate* dominator) {
flags_ = static_cast<HAllocate::Flags>(flags_ | ALLOCATION_FOLDED);
ClearFlag(kTrackSideEffectDominators);
ClearChangesFlag(kNewSpacePromotion);
SetOperandAt(2, dominator);
}
bool IsAllocationFolded() { return (flags_ & ALLOCATION_FOLDED) != 0; }
bool HandleSideEffectDominator(GVNFlag side_effect,
HValue* dominator) override;
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
DECLARE_CONCRETE_INSTRUCTION(Allocate)
private:
enum Flags {
ALLOCATE_IN_NEW_SPACE = 1 << 0,
ALLOCATE_IN_OLD_SPACE = 1 << 2,
ALLOCATE_DOUBLE_ALIGNED = 1 << 3,
PREFILL_WITH_FILLER = 1 << 4,
ALLOCATION_FOLDING_DOMINATOR = 1 << 5,
ALLOCATION_FOLDED = 1 << 6
};
HAllocate(
HValue* context, HValue* size, HType type, PretenureFlag pretenure_flag,
InstanceType instance_type, HValue* dominator,
Handle<AllocationSite> allocation_site = Handle<AllocationSite>::null())
: HTemplateInstruction<3>(type),
flags_(ComputeFlags(pretenure_flag, instance_type)) {
SetOperandAt(0, context);
UpdateSize(size);
SetOperandAt(2, dominator);
set_representation(Representation::Tagged());
SetFlag(kTrackSideEffectDominators);
SetChangesFlag(kNewSpacePromotion);
SetDependsOnFlag(kNewSpacePromotion);
if (FLAG_trace_pretenuring) {
PrintF("HAllocate with AllocationSite %p %s\n",
allocation_site.is_null()
? static_cast<void*>(NULL)
: static_cast<void*>(*allocation_site),
pretenure_flag == TENURED ? "tenured" : "not tenured");
}
}
static Flags ComputeFlags(PretenureFlag pretenure_flag,
InstanceType instance_type) {
Flags flags = pretenure_flag == TENURED ? ALLOCATE_IN_OLD_SPACE
: ALLOCATE_IN_NEW_SPACE;
if (instance_type == FIXED_DOUBLE_ARRAY_TYPE) {
flags = static_cast<Flags>(flags | ALLOCATE_DOUBLE_ALIGNED);
}
// We have to fill the allocated object with one word fillers if we do
// not use allocation folding since some allocations may depend on each
// other, i.e., have a pointer to each other. A GC in between these
// allocations may leave such objects behind in a not completely initialized
// state.
if (!FLAG_use_gvn || !FLAG_use_allocation_folding) {
flags = static_cast<Flags>(flags | PREFILL_WITH_FILLER);
}
return flags;
}
void UpdateSize(HValue* size) {
SetOperandAt(1, size);
}
bool IsFoldable(HAllocate* allocate) {
return (IsNewSpaceAllocation() && allocate->IsNewSpaceAllocation()) ||
(IsOldSpaceAllocation() && allocate->IsOldSpaceAllocation());
}
Flags flags_;
Handle<Map> known_initial_map_;
};
class HStoreCodeEntry final : public HTemplateInstruction<2> {
public:
static HStoreCodeEntry* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* function, HValue* code) {
return new(zone) HStoreCodeEntry(function, code);
}
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
HValue* function() { return OperandAt(0); }
HValue* code_object() { return OperandAt(1); }
DECLARE_CONCRETE_INSTRUCTION(StoreCodeEntry)
private:
HStoreCodeEntry(HValue* function, HValue* code) {
SetOperandAt(0, function);
SetOperandAt(1, code);
}
};
class HInnerAllocatedObject final : public HTemplateInstruction<2> {
public:
static HInnerAllocatedObject* New(Isolate* isolate, Zone* zone,
HValue* context, HValue* value,
HValue* offset, HType type) {
return new(zone) HInnerAllocatedObject(value, offset, type);
}
HValue* base_object() const { return OperandAt(0); }
HValue* offset() const { return OperandAt(1); }
Representation RequiredInputRepresentation(int index) override {
return index == 0 ? Representation::Tagged() : Representation::Integer32();
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
DECLARE_CONCRETE_INSTRUCTION(InnerAllocatedObject)
private:
HInnerAllocatedObject(HValue* value,
HValue* offset,
HType type) : HTemplateInstruction<2>(type) {
DCHECK(value->IsAllocate());
DCHECK(type.IsHeapObject());
SetOperandAt(0, value);
SetOperandAt(1, offset);
set_representation(Representation::Tagged());
}
};
inline bool StoringValueNeedsWriteBarrier(HValue* value) {
return !value->type().IsSmi()
&& !value->type().IsNull()
&& !value->type().IsBoolean()
&& !value->type().IsUndefined()
&& !(value->IsConstant() && HConstant::cast(value)->ImmortalImmovable());
}
inline bool ReceiverObjectNeedsWriteBarrier(HValue* object,
HValue* value,
HValue* dominator) {
// There may be multiple inner allocates dominated by one allocate.
while (object->IsInnerAllocatedObject()) {
object = HInnerAllocatedObject::cast(object)->base_object();
}
if (object->IsAllocate()) {
HAllocate* allocate = HAllocate::cast(object);
if (allocate->IsAllocationFolded()) {
HValue* dominator = allocate->allocation_folding_dominator();
// There is no guarantee that all allocations are folded together because
// GVN performs a fixpoint.
if (HAllocate::cast(dominator)->IsAllocationFoldingDominator()) {
object = dominator;
}
}
}
if (object->IsConstant() &&
HConstant::cast(object)->HasExternalReferenceValue()) {
// Stores to external references require no write barriers
return false;
}
// We definitely need a write barrier unless the object is the allocation
// dominator.
if (object == dominator && object->IsAllocate()) {
// Stores to new space allocations require no write barriers.
if (HAllocate::cast(object)->IsNewSpaceAllocation()) {
return false;
}
}
return true;
}
inline PointersToHereCheck PointersToHereCheckForObject(HValue* object,
HValue* dominator) {
while (object->IsInnerAllocatedObject()) {
object = HInnerAllocatedObject::cast(object)->base_object();
}
if (object == dominator &&
object->IsAllocate() &&
HAllocate::cast(object)->IsNewSpaceAllocation()) {
return kPointersToHereAreAlwaysInteresting;
}
return kPointersToHereMaybeInteresting;
}
class HLoadContextSlot final : public HUnaryOperation {
public:
enum Mode {
// Perform a normal load of the context slot without checking its value.
kNoCheck,
// Load and check the value of the context slot. Deoptimize if it's the
// hole value. This is used for checking for loading of uninitialized
// harmony bindings where we deoptimize into full-codegen generated code
// which will subsequently throw a reference error.
kCheckDeoptimize
};
HLoadContextSlot(HValue* context, int slot_index, Mode mode)
: HUnaryOperation(context), slot_index_(slot_index), mode_(mode) {
set_representation(Representation::Tagged());
SetFlag(kUseGVN);
SetDependsOnFlag(kContextSlots);
}
int slot_index() const { return slot_index_; }
Mode mode() const { return mode_; }
bool DeoptimizesOnHole() {
return mode_ == kCheckDeoptimize;
}
bool RequiresHoleCheck() const {
return mode_ != kNoCheck;
}
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
DECLARE_CONCRETE_INSTRUCTION(LoadContextSlot)
protected:
bool DataEquals(HValue* other) override {
HLoadContextSlot* b = HLoadContextSlot::cast(other);
return (slot_index() == b->slot_index());
}
private:
bool IsDeletable() const override { return !RequiresHoleCheck(); }
int slot_index_;
Mode mode_;
};
class HStoreContextSlot final : public HTemplateInstruction<2> {
public:
enum Mode {
// Perform a normal store to the context slot without checking its previous
// value.
kNoCheck,
// Check the previous value of the context slot and deoptimize if it's the
// hole value. This is used for checking for assignments to uninitialized
// harmony bindings where we deoptimize into full-codegen generated code
// which will subsequently throw a reference error.
kCheckDeoptimize
};
DECLARE_INSTRUCTION_FACTORY_P4(HStoreContextSlot, HValue*, int,
Mode, HValue*);
HValue* context() const { return OperandAt(0); }
HValue* value() const { return OperandAt(1); }
int slot_index() const { return slot_index_; }
Mode mode() const { return mode_; }
bool NeedsWriteBarrier() {
return StoringValueNeedsWriteBarrier(value());
}
bool DeoptimizesOnHole() {
return mode_ == kCheckDeoptimize;
}
bool RequiresHoleCheck() {
return mode_ != kNoCheck;
}
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
DECLARE_CONCRETE_INSTRUCTION(StoreContextSlot)
private:
HStoreContextSlot(HValue* context, int slot_index, Mode mode, HValue* value)
: slot_index_(slot_index), mode_(mode) {
SetOperandAt(0, context);
SetOperandAt(1, value);
SetChangesFlag(kContextSlots);
}
int slot_index_;
Mode mode_;
};
// Represents an access to a portion of an object, such as the map pointer,
// array elements pointer, etc, but not accesses to array elements themselves.
class HObjectAccess final {
public:
inline bool IsInobject() const {
return portion() != kBackingStore && portion() != kExternalMemory;
}
inline bool IsExternalMemory() const {
return portion() == kExternalMemory;
}
inline bool IsStringLength() const {
return portion() == kStringLengths;
}
inline bool IsMap() const {
return portion() == kMaps;
}
inline int offset() const {
return OffsetField::decode(value_);
}
inline Representation representation() const {
return Representation::FromKind(RepresentationField::decode(value_));
}
inline Handle<Name> name() const { return name_; }
inline bool immutable() const {
return ImmutableField::decode(value_);
}
// Returns true if access is being made to an in-object property that
// was already added to the object.
inline bool existing_inobject_property() const {
return ExistingInobjectPropertyField::decode(value_);
}
inline HObjectAccess WithRepresentation(Representation representation) {
return HObjectAccess(portion(), offset(), representation, name(),
immutable(), existing_inobject_property());
}
static HObjectAccess ForHeapNumberValue() {
return HObjectAccess(
kDouble, HeapNumber::kValueOffset, Representation::Double());
}
static HObjectAccess ForHeapNumberValueLowestBits() {
return HObjectAccess(kDouble,
HeapNumber::kValueOffset,
Representation::Integer32());
}
static HObjectAccess ForHeapNumberValueHighestBits() {
return HObjectAccess(kDouble,
HeapNumber::kValueOffset + kIntSize,
Representation::Integer32());
}
static HObjectAccess ForOddballToNumber(
Representation representation = Representation::Tagged()) {
return HObjectAccess(kInobject, Oddball::kToNumberOffset, representation);
}
static HObjectAccess ForOddballTypeOf() {
return HObjectAccess(kInobject, Oddball::kTypeOfOffset,
Representation::HeapObject());
}
static HObjectAccess ForElementsPointer() {
return HObjectAccess(kElementsPointer, JSObject::kElementsOffset);
}
static HObjectAccess ForLiteralsPointer() {
return HObjectAccess(kInobject, JSFunction::kLiteralsOffset);
}
static HObjectAccess ForNextFunctionLinkPointer() {
return HObjectAccess(kInobject, JSFunction::kNextFunctionLinkOffset);
}
static HObjectAccess ForArrayLength(ElementsKind elements_kind) {
return HObjectAccess(
kArrayLengths,
JSArray::kLengthOffset,
IsFastElementsKind(elements_kind)
? Representation::Smi() : Representation::Tagged());
}
static HObjectAccess ForAllocationSiteOffset(int offset);
static HObjectAccess ForAllocationSiteList() {
return HObjectAccess(kExternalMemory, 0, Representation::Tagged(),
Handle<Name>::null(), false, false);
}
static HObjectAccess ForFixedArrayLength() {
return HObjectAccess(
kArrayLengths,
FixedArray::kLengthOffset,
Representation::Smi());
}
static HObjectAccess ForFixedTypedArrayBaseBasePointer() {
return HObjectAccess(kInobject, FixedTypedArrayBase::kBasePointerOffset,
Representation::Tagged());
}
static HObjectAccess ForFixedTypedArrayBaseExternalPointer() {
return HObjectAccess::ForObservableJSObjectOffset(
FixedTypedArrayBase::kExternalPointerOffset,
Representation::External());
}
static HObjectAccess ForStringHashField() {
return HObjectAccess(kInobject,
String::kHashFieldOffset,
Representation::Integer32());
}
static HObjectAccess ForStringLength() {
STATIC_ASSERT(String::kMaxLength <= Smi::kMaxValue);
return HObjectAccess(
kStringLengths,
String::kLengthOffset,
Representation::Smi());
}
static HObjectAccess ForConsStringFirst() {
return HObjectAccess(kInobject, ConsString::kFirstOffset);
}
static HObjectAccess ForConsStringSecond() {
return HObjectAccess(kInobject, ConsString::kSecondOffset);
}
static HObjectAccess ForPropertiesPointer() {
return HObjectAccess(kInobject, JSObject::kPropertiesOffset);
}
static HObjectAccess ForPrototypeOrInitialMap() {
return HObjectAccess(kInobject, JSFunction::kPrototypeOrInitialMapOffset);
}
static HObjectAccess ForSharedFunctionInfoPointer() {
return HObjectAccess(kInobject, JSFunction::kSharedFunctionInfoOffset);
}
static HObjectAccess ForCodeEntryPointer() {
return HObjectAccess(kInobject, JSFunction::kCodeEntryOffset);
}
static HObjectAccess ForCodeOffset() {
return HObjectAccess(kInobject, SharedFunctionInfo::kCodeOffset);
}
static HObjectAccess ForOptimizedCodeMap() {
return HObjectAccess(kInobject,
SharedFunctionInfo::kOptimizedCodeMapOffset);
}
static HObjectAccess ForOptimizedCodeMapSharedCode() {
return HObjectAccess(kInobject, FixedArray::OffsetOfElementAt(
SharedFunctionInfo::kSharedCodeIndex));
}
static HObjectAccess ForFunctionContextPointer() {
return HObjectAccess(kInobject, JSFunction::kContextOffset);
}
static HObjectAccess ForMap() {
return HObjectAccess(kMaps, JSObject::kMapOffset);
}
static HObjectAccess ForPrototype() {
return HObjectAccess(kMaps, Map::kPrototypeOffset);
}
static HObjectAccess ForMapAsInteger32() {
return HObjectAccess(kMaps, JSObject::kMapOffset,
Representation::Integer32());
}
static HObjectAccess ForMapInObjectPropertiesOrConstructorFunctionIndex() {
return HObjectAccess(
kInobject, Map::kInObjectPropertiesOrConstructorFunctionIndexOffset,
Representation::UInteger8());
}
static HObjectAccess ForMapInstanceType() {
return HObjectAccess(kInobject,
Map::kInstanceTypeOffset,
Representation::UInteger8());
}
static HObjectAccess ForMapInstanceSize() {
return HObjectAccess(kInobject,
Map::kInstanceSizeOffset,
Representation::UInteger8());
}
static HObjectAccess ForMapBitField() {
return HObjectAccess(kInobject,
Map::kBitFieldOffset,
Representation::UInteger8());
}
static HObjectAccess ForMapBitField2() {
return HObjectAccess(kInobject,
Map::kBitField2Offset,
Representation::UInteger8());
}
static HObjectAccess ForMapBitField3() {
return HObjectAccess(kInobject, Map::kBitField3Offset,
Representation::Integer32());
}
static HObjectAccess ForMapDescriptors() {
return HObjectAccess(kInobject, Map::kDescriptorsOffset);
}
static HObjectAccess ForNameHashField() {
return HObjectAccess(kInobject,
Name::kHashFieldOffset,
Representation::Integer32());
}
static HObjectAccess ForMapInstanceTypeAndBitField() {
STATIC_ASSERT((Map::kInstanceTypeAndBitFieldOffset & 1) == 0);
// Ensure the two fields share one 16-bit word, endian-independent.
STATIC_ASSERT((Map::kBitFieldOffset & ~1) ==
(Map::kInstanceTypeOffset & ~1));
return HObjectAccess(kInobject,
Map::kInstanceTypeAndBitFieldOffset,
Representation::UInteger16());
}
static HObjectAccess ForPropertyCellValue() {
return HObjectAccess(kInobject, PropertyCell::kValueOffset);
}
static HObjectAccess ForPropertyCellDetails() {
return HObjectAccess(kInobject, PropertyCell::kDetailsOffset,
Representation::Smi());
}
static HObjectAccess ForCellValue() {
return HObjectAccess(kInobject, Cell::kValueOffset);
}
static HObjectAccess ForWeakCellValue() {
return HObjectAccess(kInobject, WeakCell::kValueOffset);
}
static HObjectAccess ForWeakCellNext() {
return HObjectAccess(kInobject, WeakCell::kNextOffset);
}
static HObjectAccess ForAllocationMementoSite() {
return HObjectAccess(kInobject, AllocationMemento::kAllocationSiteOffset);
}
static HObjectAccess ForCounter() {
return HObjectAccess(kExternalMemory, 0, Representation::Integer32(),
Handle<Name>::null(), false, false);
}
static HObjectAccess ForExternalUInteger8() {
return HObjectAccess(kExternalMemory, 0, Representation::UInteger8(),
Handle<Name>::null(), false, false);
}
static HObjectAccess ForBoundTargetFunction() {
return HObjectAccess(kInobject,
JSBoundFunction::kBoundTargetFunctionOffset);
}
static HObjectAccess ForBoundThis() {
return HObjectAccess(kInobject, JSBoundFunction::kBoundThisOffset);
}
static HObjectAccess ForBoundArguments() {
return HObjectAccess(kInobject, JSBoundFunction::kBoundArgumentsOffset);
}
// Create an access to an offset in a fixed array header.
static HObjectAccess ForFixedArrayHeader(int offset);
// Create an access to an in-object property in a JSObject.
// This kind of access must be used when the object |map| is known and
// in-object properties are being accessed. Accesses of the in-object
// properties can have different semantics depending on whether corresponding
// property was added to the map or not.
static HObjectAccess ForMapAndOffset(Handle<Map> map, int offset,
Representation representation = Representation::Tagged());
// Create an access to an in-object property in a JSObject.
// This kind of access can be used for accessing object header fields or
// in-object properties if the map of the object is not known.
static HObjectAccess ForObservableJSObjectOffset(int offset,
Representation representation = Representation::Tagged()) {
return ForMapAndOffset(Handle<Map>::null(), offset, representation);
}
// Create an access to an in-object property in a JSArray.
static HObjectAccess ForJSArrayOffset(int offset);
static HObjectAccess ForContextSlot(int index);
static HObjectAccess ForScriptContext(int index);
// Create an access to the backing store of an object.
static HObjectAccess ForBackingStoreOffset(int offset,
Representation representation = Representation::Tagged());
// Create an access to a resolved field (in-object or backing store).
static HObjectAccess ForField(Handle<Map> map, int index,
Representation representation,
Handle<Name> name);
static HObjectAccess ForJSTypedArrayLength() {
return HObjectAccess::ForObservableJSObjectOffset(
JSTypedArray::kLengthOffset);
}
static HObjectAccess ForJSArrayBufferBackingStore() {
return HObjectAccess::ForObservableJSObjectOffset(
JSArrayBuffer::kBackingStoreOffset, Representation::External());
}
static HObjectAccess ForJSArrayBufferByteLength() {
return HObjectAccess::ForObservableJSObjectOffset(
JSArrayBuffer::kByteLengthOffset, Representation::Tagged());
}
static HObjectAccess ForJSArrayBufferBitField() {
return HObjectAccess::ForObservableJSObjectOffset(
JSArrayBuffer::kBitFieldOffset, Representation::Integer32());
}
static HObjectAccess ForJSArrayBufferBitFieldSlot() {
return HObjectAccess::ForObservableJSObjectOffset(
JSArrayBuffer::kBitFieldSlot, Representation::Smi());
}
static HObjectAccess ForJSArrayBufferViewBuffer() {
return HObjectAccess::ForObservableJSObjectOffset(
JSArrayBufferView::kBufferOffset);
}
static HObjectAccess ForJSArrayBufferViewByteOffset() {
return HObjectAccess::ForObservableJSObjectOffset(
JSArrayBufferView::kByteOffsetOffset);
}
static HObjectAccess ForJSArrayBufferViewByteLength() {
return HObjectAccess::ForObservableJSObjectOffset(
JSArrayBufferView::kByteLengthOffset);
}
static HObjectAccess ForJSGlobalObjectNativeContext() {
return HObjectAccess(kInobject, JSGlobalObject::kNativeContextOffset);
}
static HObjectAccess ForJSRegExpFlags() {
return HObjectAccess(kInobject, JSRegExp::kFlagsOffset);
}
static HObjectAccess ForJSRegExpSource() {
return HObjectAccess(kInobject, JSRegExp::kSourceOffset);
}
static HObjectAccess ForJSCollectionTable() {
return HObjectAccess::ForObservableJSObjectOffset(
JSCollection::kTableOffset);
}
template <typename CollectionType>
static HObjectAccess ForOrderedHashTableNumberOfBuckets() {
return HObjectAccess(kInobject, CollectionType::kNumberOfBucketsOffset,
Representation::Smi());
}
template <typename CollectionType>
static HObjectAccess ForOrderedHashTableNumberOfElements() {
return HObjectAccess(kInobject, CollectionType::kNumberOfElementsOffset,
Representation::Smi());
}
template <typename CollectionType>
static HObjectAccess ForOrderedHashTableNumberOfDeletedElements() {
return HObjectAccess(kInobject,
CollectionType::kNumberOfDeletedElementsOffset,
Representation::Smi());
}
template <typename CollectionType>
static HObjectAccess ForOrderedHashTableNextTable() {
return HObjectAccess(kInobject, CollectionType::kNextTableOffset);
}
template <typename CollectionType>
static HObjectAccess ForOrderedHashTableBucket(int bucket) {
return HObjectAccess(kInobject, CollectionType::kHashTableStartOffset +
(bucket * kPointerSize),
Representation::Smi());
}
// Access into the data table of an OrderedHashTable with a
// known-at-compile-time bucket count.
template <typename CollectionType, int kBucketCount>
static HObjectAccess ForOrderedHashTableDataTableIndex(int index) {
return HObjectAccess(kInobject, CollectionType::kHashTableStartOffset +
(kBucketCount * kPointerSize) +
(index * kPointerSize));
}
inline bool Equals(HObjectAccess that) const {
return value_ == that.value_; // portion and offset must match
}
protected:
void SetGVNFlags(HValue *instr, PropertyAccessType access_type);
private:
// internal use only; different parts of an object or array
enum Portion {
kMaps, // map of an object
kArrayLengths, // the length of an array
kStringLengths, // the length of a string
kElementsPointer, // elements pointer
kBackingStore, // some field in the backing store
kDouble, // some double field
kInobject, // some other in-object field
kExternalMemory // some field in external memory
};
HObjectAccess() : value_(0) {}
HObjectAccess(Portion portion, int offset,
Representation representation = Representation::Tagged(),
Handle<Name> name = Handle<Name>::null(),
bool immutable = false, bool existing_inobject_property = true)
: value_(PortionField::encode(portion) |
RepresentationField::encode(representation.kind()) |
ImmutableField::encode(immutable ? 1 : 0) |
ExistingInobjectPropertyField::encode(
existing_inobject_property ? 1 : 0) |
OffsetField::encode(offset)),
name_(name) {
// assert that the fields decode correctly
DCHECK(this->offset() == offset);
DCHECK(this->portion() == portion);
DCHECK(this->immutable() == immutable);
DCHECK(this->existing_inobject_property() == existing_inobject_property);
DCHECK(RepresentationField::decode(value_) == representation.kind());
DCHECK(!this->existing_inobject_property() || IsInobject());
}
class PortionField : public BitField<Portion, 0, 3> {};
class RepresentationField : public BitField<Representation::Kind, 3, 4> {};
class ImmutableField : public BitField<bool, 7, 1> {};
class ExistingInobjectPropertyField : public BitField<bool, 8, 1> {};
class OffsetField : public BitField<int, 9, 23> {};
uint32_t value_; // encodes portion, representation, immutable, and offset
Handle<Name> name_;
friend class HLoadNamedField;
friend class HStoreNamedField;
friend class SideEffectsTracker;
friend std::ostream& operator<<(std::ostream& os,
const HObjectAccess& access);
inline Portion portion() const {
return PortionField::decode(value_);
}
};
std::ostream& operator<<(std::ostream& os, const HObjectAccess& access);
class HLoadNamedField final : public HTemplateInstruction<2> {
public:
DECLARE_INSTRUCTION_FACTORY_P3(HLoadNamedField, HValue*,
HValue*, HObjectAccess);
DECLARE_INSTRUCTION_FACTORY_P5(HLoadNamedField, HValue*, HValue*,
HObjectAccess, const UniqueSet<Map>*, HType);
HValue* object() const { return OperandAt(0); }
HValue* dependency() const {
DCHECK(HasDependency());
return OperandAt(1);
}
bool HasDependency() const { return OperandAt(0) != OperandAt(1); }
HObjectAccess access() const { return access_; }
Representation field_representation() const {
return access_.representation();
}
const UniqueSet<Map>* maps() const { return maps_; }
bool HasEscapingOperandAt(int index) override { return false; }
bool HasOutOfBoundsAccess(int size) override {
return !access().IsInobject() || access().offset() >= size;
}
Representation RequiredInputRepresentation(int index) override {
if (index == 0) {
// object must be external in case of external memory access
return access().IsExternalMemory() ? Representation::External()
: Representation::Tagged();
}
DCHECK(index == 1);
return Representation::None();
}
Range* InferRange(Zone* zone) override;
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
bool CanBeReplacedWith(HValue* other) const {
if (!CheckFlag(HValue::kCantBeReplaced)) return false;
if (!type().Equals(other->type())) return false;
if (!representation().Equals(other->representation())) return false;
if (!other->IsLoadNamedField()) return true;
HLoadNamedField* that = HLoadNamedField::cast(other);
if (this->maps_ == that->maps_) return true;
if (this->maps_ == NULL || that->maps_ == NULL) return false;
return this->maps_->IsSubset(that->maps_);
}
DECLARE_CONCRETE_INSTRUCTION(LoadNamedField)
protected:
bool DataEquals(HValue* other) override {
HLoadNamedField* that = HLoadNamedField::cast(other);
if (!this->access_.Equals(that->access_)) return false;
if (this->maps_ == that->maps_) return true;
return (this->maps_ != NULL &&
that->maps_ != NULL &&
this->maps_->Equals(that->maps_));
}
private:
HLoadNamedField(HValue* object,
HValue* dependency,
HObjectAccess access)
: access_(access), maps_(NULL) {
DCHECK_NOT_NULL(object);
SetOperandAt(0, object);
SetOperandAt(1, dependency ? dependency : object);
Representation representation = access.representation();
if (representation.IsInteger8() ||
representation.IsUInteger8() ||
representation.IsInteger16() ||
representation.IsUInteger16()) {
set_representation(Representation::Integer32());
} else if (representation.IsSmi()) {
set_type(HType::Smi());
if (SmiValuesAre32Bits()) {
set_representation(Representation::Integer32());
} else {
set_representation(representation);
}
} else if (representation.IsDouble() ||
representation.IsExternal() ||
representation.IsInteger32()) {
set_representation(representation);
} else if (representation.IsHeapObject()) {
set_type(HType::HeapObject());
set_representation(Representation::Tagged());
} else {
set_representation(Representation::Tagged());
}
access.SetGVNFlags(this, LOAD);
}
HLoadNamedField(HValue* object,
HValue* dependency,
HObjectAccess access,
const UniqueSet<Map>* maps,
HType type)
: HTemplateInstruction<2>(type), access_(access), maps_(maps) {
DCHECK_NOT_NULL(maps);
DCHECK_NE(0, maps->size());
DCHECK_NOT_NULL(object);
SetOperandAt(0, object);
SetOperandAt(1, dependency ? dependency : object);
DCHECK(access.representation().IsHeapObject());
DCHECK(type.IsHeapObject());
set_representation(Representation::Tagged());
access.SetGVNFlags(this, LOAD);
}
bool IsDeletable() const override { return true; }
HObjectAccess access_;
const UniqueSet<Map>* maps_;
};
class HLoadNamedGeneric final : public HTemplateInstruction<2> {
public:
DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P4(HLoadNamedGeneric, HValue*,
Handle<Name>,
Handle<TypeFeedbackVector>,
FeedbackVectorSlot);
HValue* context() const { return OperandAt(0); }
HValue* object() const { return OperandAt(1); }
Handle<Name> name() const { return name_; }
FeedbackVectorSlot slot() const { return slot_; }
Handle<TypeFeedbackVector> feedback_vector() const {
return feedback_vector_;
}
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
DECLARE_CONCRETE_INSTRUCTION(LoadNamedGeneric)
private:
HLoadNamedGeneric(HValue* context, HValue* object, Handle<Name> name,
Handle<TypeFeedbackVector> vector, FeedbackVectorSlot slot)
: name_(name), feedback_vector_(vector), slot_(slot) {
SetOperandAt(0, context);
SetOperandAt(1, object);
set_representation(Representation::Tagged());
SetAllSideEffects();
}
Handle<Name> name_;
Handle<TypeFeedbackVector> feedback_vector_;
FeedbackVectorSlot slot_;
};
class HLoadFunctionPrototype final : public HUnaryOperation {
public:
DECLARE_INSTRUCTION_FACTORY_P1(HLoadFunctionPrototype, HValue*);
HValue* function() { return OperandAt(0); }
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
DECLARE_CONCRETE_INSTRUCTION(LoadFunctionPrototype)
protected:
bool DataEquals(HValue* other) override { return true; }
private:
explicit HLoadFunctionPrototype(HValue* function)
: HUnaryOperation(function) {
set_representation(Representation::Tagged());
SetFlag(kUseGVN);
SetDependsOnFlag(kCalls);
}
};
class ArrayInstructionInterface {
public:
virtual HValue* GetKey() = 0;
virtual void SetKey(HValue* key) = 0;
virtual ElementsKind elements_kind() const = 0;
// TryIncreaseBaseOffset returns false if overflow would result.
virtual bool TryIncreaseBaseOffset(uint32_t increase_by_value) = 0;
virtual bool IsDehoisted() const = 0;
virtual void SetDehoisted(bool is_dehoisted) = 0;
virtual ~ArrayInstructionInterface() { }
static Representation KeyedAccessIndexRequirement(Representation r) {
return r.IsInteger32() || SmiValuesAre32Bits()
? Representation::Integer32() : Representation::Smi();
}
};
static const int kDefaultKeyedHeaderOffsetSentinel = -1;
enum LoadKeyedHoleMode {
NEVER_RETURN_HOLE,
ALLOW_RETURN_HOLE,
CONVERT_HOLE_TO_UNDEFINED
};
class HLoadKeyed final : public HTemplateInstruction<4>,
public ArrayInstructionInterface {
public:
DECLARE_INSTRUCTION_FACTORY_P5(HLoadKeyed, HValue*, HValue*, HValue*, HValue*,
ElementsKind);
DECLARE_INSTRUCTION_FACTORY_P6(HLoadKeyed, HValue*, HValue*, HValue*, HValue*,
ElementsKind, LoadKeyedHoleMode);
DECLARE_INSTRUCTION_FACTORY_P7(HLoadKeyed, HValue*, HValue*, HValue*, HValue*,
ElementsKind, LoadKeyedHoleMode, int);
bool is_fixed_typed_array() const {
return IsFixedTypedArrayElementsKind(elements_kind());
}
HValue* elements() const { return OperandAt(0); }
HValue* key() const { return OperandAt(1); }
HValue* dependency() const {
DCHECK(HasDependency());
return OperandAt(2);
}
bool HasDependency() const { return OperandAt(0) != OperandAt(2); }
HValue* backing_store_owner() const {
DCHECK(HasBackingStoreOwner());
return OperandAt(3);
}
bool HasBackingStoreOwner() const { return OperandAt(0) != OperandAt(3); }
uint32_t base_offset() const { return BaseOffsetField::decode(bit_field_); }
bool TryIncreaseBaseOffset(uint32_t increase_by_value) override;
HValue* GetKey() override { return key(); }
void SetKey(HValue* key) override { SetOperandAt(1, key); }
bool IsDehoisted() const override {
return IsDehoistedField::decode(bit_field_);
}
void SetDehoisted(bool is_dehoisted) override {
bit_field_ = IsDehoistedField::update(bit_field_, is_dehoisted);
}
ElementsKind elements_kind() const override {
return ElementsKindField::decode(bit_field_);
}
LoadKeyedHoleMode hole_mode() const {
return HoleModeField::decode(bit_field_);
}
Representation RequiredInputRepresentation(int index) override {
// kind_fast: tagged[int32] (none)
// kind_double: tagged[int32] (none)
// kind_fixed_typed_array: external[int32] (none)
// kind_external: external[int32] (none)
if (index == 0) {
return is_fixed_typed_array() ? Representation::External()
: Representation::Tagged();
}
if (index == 1) {
return ArrayInstructionInterface::KeyedAccessIndexRequirement(
OperandAt(1)->representation());
}
if (index == 2) {
return Representation::None();
}
DCHECK_EQ(3, index);
return HasBackingStoreOwner() ? Representation::Tagged()
: Representation::None();
}
Representation observed_input_representation(int index) override {
return RequiredInputRepresentation(index);
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
bool UsesMustHandleHole() const;
bool AllUsesCanTreatHoleAsNaN() const;
bool RequiresHoleCheck() const;
Range* InferRange(Zone* zone) override;
DECLARE_CONCRETE_INSTRUCTION(LoadKeyed)
protected:
bool DataEquals(HValue* other) override {
if (!other->IsLoadKeyed()) return false;
HLoadKeyed* other_load = HLoadKeyed::cast(other);
if (base_offset() != other_load->base_offset()) return false;
return elements_kind() == other_load->elements_kind();
}
private:
HLoadKeyed(HValue* obj, HValue* key, HValue* dependency,
HValue* backing_store_owner, ElementsKind elements_kind,
LoadKeyedHoleMode mode = NEVER_RETURN_HOLE,
int offset = kDefaultKeyedHeaderOffsetSentinel)
: bit_field_(0) {
offset = offset == kDefaultKeyedHeaderOffsetSentinel
? GetDefaultHeaderSizeForElementsKind(elements_kind)
: offset;
bit_field_ = ElementsKindField::encode(elements_kind) |
HoleModeField::encode(mode) |
BaseOffsetField::encode(offset);
SetOperandAt(0, obj);
SetOperandAt(1, key);
SetOperandAt(2, dependency != nullptr ? dependency : obj);
SetOperandAt(3, backing_store_owner != nullptr ? backing_store_owner : obj);
DCHECK_EQ(HasBackingStoreOwner(), is_fixed_typed_array());
if (!is_fixed_typed_array()) {
// I can detect the case between storing double (holey and fast) and
// smi/object by looking at elements_kind_.
DCHECK(IsFastSmiOrObjectElementsKind(elements_kind) ||
IsFastDoubleElementsKind(elements_kind));
if (IsFastSmiOrObjectElementsKind(elements_kind)) {
if (IsFastSmiElementsKind(elements_kind) &&
(!IsHoleyElementsKind(elements_kind) ||
mode == NEVER_RETURN_HOLE)) {
set_type(HType::Smi());
if (SmiValuesAre32Bits() && !RequiresHoleCheck()) {
set_representation(Representation::Integer32());
} else {
set_representation(Representation::Smi());
}
} else {
set_representation(Representation::Tagged());
}
SetDependsOnFlag(kArrayElements);
} else {
set_representation(Representation::Double());
SetDependsOnFlag(kDoubleArrayElements);
}
} else {
if (elements_kind == FLOAT32_ELEMENTS ||
elements_kind == FLOAT64_ELEMENTS) {
set_representation(Representation::Double());
} else {
set_representation(Representation::Integer32());
}
if (is_fixed_typed_array()) {
SetDependsOnFlag(kExternalMemory);
SetDependsOnFlag(kTypedArrayElements);
} else {
UNREACHABLE();
}
// Native code could change the specialized array.
SetDependsOnFlag(kCalls);
}
SetFlag(kUseGVN);
}
bool IsDeletable() const override { return !RequiresHoleCheck(); }
// Establish some checks around our packed fields
enum LoadKeyedBits {
kBitsForElementsKind = 5,
kBitsForHoleMode = 2,
kBitsForBaseOffset = 24,
kBitsForIsDehoisted = 1,
kStartElementsKind = 0,
kStartHoleMode = kStartElementsKind + kBitsForElementsKind,
kStartBaseOffset = kStartHoleMode + kBitsForHoleMode,
kStartIsDehoisted = kStartBaseOffset + kBitsForBaseOffset
};
STATIC_ASSERT((kBitsForElementsKind + kBitsForHoleMode + kBitsForBaseOffset +
kBitsForIsDehoisted) <= sizeof(uint32_t) * 8);
STATIC_ASSERT(kElementsKindCount <= (1 << kBitsForElementsKind));
class ElementsKindField:
public BitField<ElementsKind, kStartElementsKind, kBitsForElementsKind>
{}; // NOLINT
class HoleModeField:
public BitField<LoadKeyedHoleMode, kStartHoleMode, kBitsForHoleMode>
{}; // NOLINT
class BaseOffsetField:
public BitField<uint32_t, kStartBaseOffset, kBitsForBaseOffset>
{}; // NOLINT
class IsDehoistedField:
public BitField<bool, kStartIsDehoisted, kBitsForIsDehoisted>
{}; // NOLINT
uint32_t bit_field_;
};
class HLoadKeyedGeneric final : public HTemplateInstruction<3> {
public:
DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P4(HLoadKeyedGeneric, HValue*,
HValue*,
Handle<TypeFeedbackVector>,
FeedbackVectorSlot);
HValue* object() const { return OperandAt(0); }
HValue* key() const { return OperandAt(1); }
HValue* context() const { return OperandAt(2); }
FeedbackVectorSlot slot() const { return slot_; }
Handle<TypeFeedbackVector> feedback_vector() const {
return feedback_vector_;
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
Representation RequiredInputRepresentation(int index) override {
// tagged[tagged]
return Representation::Tagged();
}
HValue* Canonicalize() override;
DECLARE_CONCRETE_INSTRUCTION(LoadKeyedGeneric)
private:
HLoadKeyedGeneric(HValue* context, HValue* obj, HValue* key,
Handle<TypeFeedbackVector> vector, FeedbackVectorSlot slot)
: feedback_vector_(vector), slot_(slot) {
set_representation(Representation::Tagged());
SetOperandAt(0, obj);
SetOperandAt(1, key);
SetOperandAt(2, context);
SetAllSideEffects();
}
Handle<TypeFeedbackVector> feedback_vector_;
FeedbackVectorSlot slot_;
};
// Indicates whether the store is a store to an entry that was previously
// initialized or not.
enum StoreFieldOrKeyedMode {
// The entry could be either previously initialized or not.
INITIALIZING_STORE,
// At the time of this store it is guaranteed that the entry is already
// initialized.
STORE_TO_INITIALIZED_ENTRY
};
class HStoreNamedField final : public HTemplateInstruction<3> {
public:
DECLARE_INSTRUCTION_FACTORY_P3(HStoreNamedField, HValue*,
HObjectAccess, HValue*);
DECLARE_INSTRUCTION_FACTORY_P4(HStoreNamedField, HValue*,
HObjectAccess, HValue*, StoreFieldOrKeyedMode);
DECLARE_CONCRETE_INSTRUCTION(StoreNamedField)
bool HasEscapingOperandAt(int index) override { return index == 1; }
bool HasOutOfBoundsAccess(int size) override {
return !access().IsInobject() || access().offset() >= size;
}
Representation RequiredInputRepresentation(int index) override {
if (index == 0 && access().IsExternalMemory()) {
// object must be external in case of external memory access
return Representation::External();
} else if (index == 1) {
if (field_representation().IsInteger8() ||
field_representation().IsUInteger8() ||
field_representation().IsInteger16() ||
field_representation().IsUInteger16() ||
field_representation().IsInteger32()) {
return Representation::Integer32();
} else if (field_representation().IsDouble()) {
return field_representation();
} else if (field_representation().IsSmi()) {
if (SmiValuesAre32Bits() &&
store_mode() == STORE_TO_INITIALIZED_ENTRY) {
return Representation::Integer32();
}
return field_representation();
} else if (field_representation().IsExternal()) {
return Representation::External();
}
}
return Representation::Tagged();
}
bool HandleSideEffectDominator(GVNFlag side_effect,
HValue* dominator) override {
DCHECK(side_effect == kNewSpacePromotion);
if (!FLAG_use_write_barrier_elimination) return false;
dominator_ = dominator;
return false;
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
HValue* object() const { return OperandAt(0); }
HValue* value() const { return OperandAt(1); }
HValue* transition() const { return OperandAt(2); }
HObjectAccess access() const { return access_; }
HValue* dominator() const { return dominator_; }
bool has_transition() const { return HasTransitionField::decode(bit_field_); }
StoreFieldOrKeyedMode store_mode() const {
return StoreModeField::decode(bit_field_);
}
Handle<Map> transition_map() const {
if (has_transition()) {
return Handle<Map>::cast(
HConstant::cast(transition())->handle(isolate()));
} else {
return Handle<Map>();
}
}
void SetTransition(HConstant* transition) {
DCHECK(!has_transition()); // Only set once.
SetOperandAt(2, transition);
bit_field_ = HasTransitionField::update(bit_field_, true);
SetChangesFlag(kMaps);
}
bool NeedsWriteBarrier() const {
DCHECK(!field_representation().IsDouble() ||
(FLAG_unbox_double_fields && access_.IsInobject()) ||
!has_transition());
if (field_representation().IsDouble()) return false;
if (field_representation().IsSmi()) return false;
if (field_representation().IsInteger32()) return false;
if (field_representation().IsExternal()) return false;
return StoringValueNeedsWriteBarrier(value()) &&
ReceiverObjectNeedsWriteBarrier(object(), value(), dominator());
}
bool NeedsWriteBarrierForMap() {
return ReceiverObjectNeedsWriteBarrier(object(), transition(),
dominator());
}
SmiCheck SmiCheckForWriteBarrier() const {
if (field_representation().IsHeapObject()) return OMIT_SMI_CHECK;
if (value()->type().IsHeapObject()) return OMIT_SMI_CHECK;
return INLINE_SMI_CHECK;
}
PointersToHereCheck PointersToHereCheckForValue() const {
return PointersToHereCheckForObject(value(), dominator());
}
Representation field_representation() const {
return access_.representation();
}
void UpdateValue(HValue* value) {
SetOperandAt(1, value);
}
bool CanBeReplacedWith(HStoreNamedField* that) const {
if (!this->access().Equals(that->access())) return false;
if (SmiValuesAre32Bits() &&
this->field_representation().IsSmi() &&
this->store_mode() == INITIALIZING_STORE &&
that->store_mode() == STORE_TO_INITIALIZED_ENTRY) {
// We cannot replace an initializing store to a smi field with a store to
// an initialized entry on 64-bit architectures (with 32-bit smis).
return false;
}
return true;
}
private:
HStoreNamedField(HValue* obj, HObjectAccess access, HValue* val,
StoreFieldOrKeyedMode store_mode = INITIALIZING_STORE)
: access_(access),
dominator_(NULL),
bit_field_(HasTransitionField::encode(false) |
StoreModeField::encode(store_mode)) {
// Stores to a non existing in-object property are allowed only to the
// newly allocated objects (via HAllocate or HInnerAllocatedObject).
DCHECK(!access.IsInobject() || access.existing_inobject_property() ||
obj->IsAllocate() || obj->IsInnerAllocatedObject());
SetOperandAt(0, obj);
SetOperandAt(1, val);
SetOperandAt(2, obj);
access.SetGVNFlags(this, STORE);
}
class HasTransitionField : public BitField<bool, 0, 1> {};
class StoreModeField : public BitField<StoreFieldOrKeyedMode, 1, 1> {};
HObjectAccess access_;
HValue* dominator_;
uint32_t bit_field_;
};
class HStoreNamedGeneric final : public HTemplateInstruction<3> {
public:
DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P6(HStoreNamedGeneric, HValue*,
Handle<Name>, HValue*,
LanguageMode,
Handle<TypeFeedbackVector>,
FeedbackVectorSlot);
HValue* object() const { return OperandAt(0); }
HValue* value() const { return OperandAt(1); }
HValue* context() const { return OperandAt(2); }
Handle<Name> name() const { return name_; }
LanguageMode language_mode() const { return language_mode_; }
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
FeedbackVectorSlot slot() const { return slot_; }
Handle<TypeFeedbackVector> feedback_vector() const {
return feedback_vector_;
}
DECLARE_CONCRETE_INSTRUCTION(StoreNamedGeneric)
private:
HStoreNamedGeneric(HValue* context, HValue* object, Handle<Name> name,
HValue* value, LanguageMode language_mode,
Handle<TypeFeedbackVector> vector, FeedbackVectorSlot slot)
: name_(name),
feedback_vector_(vector),
slot_(slot),
language_mode_(language_mode) {
SetOperandAt(0, object);
SetOperandAt(1, value);
SetOperandAt(2, context);
SetAllSideEffects();
}
Handle<Name> name_;
Handle<TypeFeedbackVector> feedback_vector_;
FeedbackVectorSlot slot_;
LanguageMode language_mode_;
};
class HStoreKeyed final : public HTemplateInstruction<4>,
public ArrayInstructionInterface {
public:
DECLARE_INSTRUCTION_FACTORY_P5(HStoreKeyed, HValue*, HValue*, HValue*,
HValue*, ElementsKind);
DECLARE_INSTRUCTION_FACTORY_P6(HStoreKeyed, HValue*, HValue*, HValue*,
HValue*, ElementsKind, StoreFieldOrKeyedMode);
DECLARE_INSTRUCTION_FACTORY_P7(HStoreKeyed, HValue*, HValue*, HValue*,
HValue*, ElementsKind, StoreFieldOrKeyedMode,
int);
Representation RequiredInputRepresentation(int index) override {
// kind_fast: tagged[int32] = tagged
// kind_double: tagged[int32] = double
// kind_smi : tagged[int32] = smi
// kind_fixed_typed_array: tagged[int32] = (double | int32)
// kind_external: external[int32] = (double | int32)
if (index == 0) {
return is_fixed_typed_array() ? Representation::External()
: Representation::Tagged();
} else if (index == 1) {
return ArrayInstructionInterface::KeyedAccessIndexRequirement(
OperandAt(1)->representation());
} else if (index == 2) {
return RequiredValueRepresentation(elements_kind(), store_mode());
}
DCHECK_EQ(3, index);
return HasBackingStoreOwner() ? Representation::Tagged()
: Representation::None();
}
static Representation RequiredValueRepresentation(
ElementsKind kind, StoreFieldOrKeyedMode mode) {
if (IsDoubleOrFloatElementsKind(kind)) {
return Representation::Double();
}
if (kind == FAST_SMI_ELEMENTS && SmiValuesAre32Bits() &&
mode == STORE_TO_INITIALIZED_ENTRY) {
return Representation::Integer32();
}
if (IsFastSmiElementsKind(kind)) {
return Representation::Smi();
}
if (IsFixedTypedArrayElementsKind(kind)) {
return Representation::Integer32();
}
return Representation::Tagged();
}
bool is_fixed_typed_array() const {
return IsFixedTypedArrayElementsKind(elements_kind());
}
Representation observed_input_representation(int index) override {
if (index != 2) return RequiredInputRepresentation(index);
if (IsUninitialized()) {
return Representation::None();
}
Representation r =
RequiredValueRepresentation(elements_kind(), store_mode());
// For fast object elements kinds, don't assume anything.
if (r.IsTagged()) return Representation::None();
return r;
}
HValue* elements() const { return OperandAt(0); }
HValue* key() const { return OperandAt(1); }
HValue* value() const { return OperandAt(2); }
HValue* backing_store_owner() const {
DCHECK(HasBackingStoreOwner());
return OperandAt(3);
}
bool HasBackingStoreOwner() const { return OperandAt(0) != OperandAt(3); }
bool value_is_smi() const { return IsFastSmiElementsKind(elements_kind()); }
StoreFieldOrKeyedMode store_mode() const {
return StoreModeField::decode(bit_field_);
}
ElementsKind elements_kind() const override {
return ElementsKindField::decode(bit_field_);
}
uint32_t base_offset() const { return base_offset_; }
bool TryIncreaseBaseOffset(uint32_t increase_by_value) override;
HValue* GetKey() override { return key(); }
void SetKey(HValue* key) override { SetOperandAt(1, key); }
bool IsDehoisted() const override {
return IsDehoistedField::decode(bit_field_);
}
void SetDehoisted(bool is_dehoisted) override {
bit_field_ = IsDehoistedField::update(bit_field_, is_dehoisted);
}
bool IsUninitialized() { return IsUninitializedField::decode(bit_field_); }
void SetUninitialized(bool is_uninitialized) {
bit_field_ = IsUninitializedField::update(bit_field_, is_uninitialized);
}
bool IsConstantHoleStore() {
return value()->IsConstant() && HConstant::cast(value())->IsTheHole();
}
bool HandleSideEffectDominator(GVNFlag side_effect,
HValue* dominator) override {
DCHECK(side_effect == kNewSpacePromotion);
dominator_ = dominator;
return false;
}
HValue* dominator() const { return dominator_; }
bool NeedsWriteBarrier() {
if (value_is_smi()) {
return false;
} else {
return StoringValueNeedsWriteBarrier(value()) &&
ReceiverObjectNeedsWriteBarrier(elements(), value(), dominator());
}
}
PointersToHereCheck PointersToHereCheckForValue() const {
return PointersToHereCheckForObject(value(), dominator());
}
bool NeedsCanonicalization();
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
DECLARE_CONCRETE_INSTRUCTION(StoreKeyed)
private:
HStoreKeyed(HValue* obj, HValue* key, HValue* val,
HValue* backing_store_owner, ElementsKind elements_kind,
StoreFieldOrKeyedMode store_mode = INITIALIZING_STORE,
int offset = kDefaultKeyedHeaderOffsetSentinel)
: base_offset_(offset == kDefaultKeyedHeaderOffsetSentinel
? GetDefaultHeaderSizeForElementsKind(elements_kind)
: offset),
bit_field_(IsDehoistedField::encode(false) |
IsUninitializedField::encode(false) |
StoreModeField::encode(store_mode) |
ElementsKindField::encode(elements_kind)),
dominator_(NULL) {
SetOperandAt(0, obj);
SetOperandAt(1, key);
SetOperandAt(2, val);
SetOperandAt(3, backing_store_owner != nullptr ? backing_store_owner : obj);
DCHECK_EQ(HasBackingStoreOwner(), is_fixed_typed_array());
if (IsFastObjectElementsKind(elements_kind)) {
SetFlag(kTrackSideEffectDominators);
SetDependsOnFlag(kNewSpacePromotion);
}
if (IsFastDoubleElementsKind(elements_kind)) {
SetChangesFlag(kDoubleArrayElements);
} else if (IsFastSmiElementsKind(elements_kind)) {
SetChangesFlag(kArrayElements);
} else if (is_fixed_typed_array()) {
SetChangesFlag(kTypedArrayElements);
SetChangesFlag(kExternalMemory);
SetFlag(kAllowUndefinedAsNaN);
} else {
SetChangesFlag(kArrayElements);
}
// {UNSIGNED_,}{BYTE,SHORT,INT}_ELEMENTS are truncating.
if (elements_kind >= UINT8_ELEMENTS && elements_kind <= INT32_ELEMENTS) {
SetFlag(kTruncatingToInt32);
}
}
class IsDehoistedField : public BitField<bool, 0, 1> {};
class IsUninitializedField : public BitField<bool, 1, 1> {};
class StoreModeField : public BitField<StoreFieldOrKeyedMode, 2, 1> {};
class ElementsKindField : public BitField<ElementsKind, 3, 5> {};
uint32_t base_offset_;
uint32_t bit_field_;
HValue* dominator_;
};
class HStoreKeyedGeneric final : public HTemplateInstruction<4> {
public:
DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P6(HStoreKeyedGeneric, HValue*,
HValue*, HValue*, LanguageMode,
Handle<TypeFeedbackVector>,
FeedbackVectorSlot);
HValue* object() const { return OperandAt(0); }
HValue* key() const { return OperandAt(1); }
HValue* value() const { return OperandAt(2); }
HValue* context() const { return OperandAt(3); }
LanguageMode language_mode() const { return language_mode_; }
Representation RequiredInputRepresentation(int index) override {
// tagged[tagged] = tagged
return Representation::Tagged();
}
FeedbackVectorSlot slot() const { return slot_; }
Handle<TypeFeedbackVector> feedback_vector() const {
return feedback_vector_;
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
DECLARE_CONCRETE_INSTRUCTION(StoreKeyedGeneric)
private:
HStoreKeyedGeneric(HValue* context, HValue* object, HValue* key,
HValue* value, LanguageMode language_mode,
Handle<TypeFeedbackVector> vector, FeedbackVectorSlot slot)
: feedback_vector_(vector), slot_(slot), language_mode_(language_mode) {
SetOperandAt(0, object);
SetOperandAt(1, key);
SetOperandAt(2, value);
SetOperandAt(3, context);
SetAllSideEffects();
}
Handle<TypeFeedbackVector> feedback_vector_;
FeedbackVectorSlot slot_;
LanguageMode language_mode_;
};
class HTransitionElementsKind final : public HTemplateInstruction<2> {
public:
inline static HTransitionElementsKind* New(Isolate* isolate, Zone* zone,
HValue* context, HValue* object,
Handle<Map> original_map,
Handle<Map> transitioned_map) {
return new(zone) HTransitionElementsKind(context, object,
original_map, transitioned_map);
}
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
HValue* object() const { return OperandAt(0); }
HValue* context() const { return OperandAt(1); }
Unique<Map> original_map() const { return original_map_; }
Unique<Map> transitioned_map() const { return transitioned_map_; }
ElementsKind from_kind() const {
return FromElementsKindField::decode(bit_field_);
}
ElementsKind to_kind() const {
return ToElementsKindField::decode(bit_field_);
}
bool map_is_stable() const { return MapIsStableField::decode(bit_field_); }
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
DECLARE_CONCRETE_INSTRUCTION(TransitionElementsKind)
protected:
bool DataEquals(HValue* other) override {
HTransitionElementsKind* instr = HTransitionElementsKind::cast(other);
return original_map_ == instr->original_map_ &&
transitioned_map_ == instr->transitioned_map_;
}
int RedefinedOperandIndex() override { return 0; }
private:
HTransitionElementsKind(HValue* context, HValue* object,
Handle<Map> original_map,
Handle<Map> transitioned_map)
: original_map_(Unique<Map>(original_map)),
transitioned_map_(Unique<Map>(transitioned_map)),
bit_field_(
FromElementsKindField::encode(original_map->elements_kind()) |
ToElementsKindField::encode(transitioned_map->elements_kind()) |
MapIsStableField::encode(transitioned_map->is_stable())) {
SetOperandAt(0, object);
SetOperandAt(1, context);
SetFlag(kUseGVN);
SetChangesFlag(kElementsKind);
if (!IsSimpleMapChangeTransition(from_kind(), to_kind())) {
SetChangesFlag(kElementsPointer);
SetChangesFlag(kNewSpacePromotion);
}
set_representation(Representation::Tagged());
}
class FromElementsKindField : public BitField<ElementsKind, 0, 5> {};
class ToElementsKindField : public BitField<ElementsKind, 5, 5> {};
class MapIsStableField : public BitField<bool, 10, 1> {};
Unique<Map> original_map_;
Unique<Map> transitioned_map_;
uint32_t bit_field_;
};
class HStringAdd final : public HBinaryOperation {
public:
static HInstruction* New(
Isolate* isolate, Zone* zone, HValue* context, HValue* left,
HValue* right, PretenureFlag pretenure_flag = NOT_TENURED,
StringAddFlags flags = STRING_ADD_CHECK_BOTH,
Handle<AllocationSite> allocation_site = Handle<AllocationSite>::null());
StringAddFlags flags() const { return flags_; }
PretenureFlag pretenure_flag() const { return pretenure_flag_; }
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
DECLARE_CONCRETE_INSTRUCTION(StringAdd)
protected:
bool DataEquals(HValue* other) override {
return flags_ == HStringAdd::cast(other)->flags_ &&
pretenure_flag_ == HStringAdd::cast(other)->pretenure_flag_;
}
private:
HStringAdd(HValue* context, HValue* left, HValue* right,
PretenureFlag pretenure_flag, StringAddFlags flags,
Handle<AllocationSite> allocation_site)
: HBinaryOperation(context, left, right, HType::String()),
flags_(flags),
pretenure_flag_(pretenure_flag) {
set_representation(Representation::Tagged());
if ((flags & STRING_ADD_CONVERT) == STRING_ADD_CONVERT) {
SetAllSideEffects();
ClearFlag(kUseGVN);
} else {
SetChangesFlag(kNewSpacePromotion);
SetFlag(kUseGVN);
}
SetDependsOnFlag(kMaps);
if (FLAG_trace_pretenuring) {
PrintF("HStringAdd with AllocationSite %p %s\n",
allocation_site.is_null()
? static_cast<void*>(NULL)
: static_cast<void*>(*allocation_site),
pretenure_flag == TENURED ? "tenured" : "not tenured");
}
}
bool IsDeletable() const final {
return (flags_ & STRING_ADD_CONVERT) != STRING_ADD_CONVERT;
}
const StringAddFlags flags_;
const PretenureFlag pretenure_flag_;
};
class HStringCharCodeAt final : public HTemplateInstruction<3> {
public:
DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P2(HStringCharCodeAt,
HValue*,
HValue*);
Representation RequiredInputRepresentation(int index) override {
// The index is supposed to be Integer32.
return index == 2
? Representation::Integer32()
: Representation::Tagged();
}
HValue* context() const { return OperandAt(0); }
HValue* string() const { return OperandAt(1); }
HValue* index() const { return OperandAt(2); }
DECLARE_CONCRETE_INSTRUCTION(StringCharCodeAt)
protected:
bool DataEquals(HValue* other) override { return true; }
Range* InferRange(Zone* zone) override {
return new(zone) Range(0, String::kMaxUtf16CodeUnit);
}
private:
HStringCharCodeAt(HValue* context, HValue* string, HValue* index) {
SetOperandAt(0, context);
SetOperandAt(1, string);
SetOperandAt(2, index);
set_representation(Representation::Integer32());
SetFlag(kUseGVN);
SetDependsOnFlag(kMaps);
SetDependsOnFlag(kStringChars);
SetChangesFlag(kNewSpacePromotion);
}
// No side effects: runtime function assumes string + number inputs.
bool IsDeletable() const override { return true; }
};
class HStringCharFromCode final : public HTemplateInstruction<2> {
public:
static HInstruction* New(Isolate* isolate, Zone* zone, HValue* context,
HValue* char_code);
Representation RequiredInputRepresentation(int index) override {
return index == 0
? Representation::Tagged()
: Representation::Integer32();
}
HValue* context() const { return OperandAt(0); }
HValue* value() const { return OperandAt(1); }
bool DataEquals(HValue* other) override { return true; }
DECLARE_CONCRETE_INSTRUCTION(StringCharFromCode)
private:
HStringCharFromCode(HValue* context, HValue* char_code)
: HTemplateInstruction<2>(HType::String()) {
SetOperandAt(0, context);
SetOperandAt(1, char_code);
set_representation(Representation::Tagged());
SetFlag(kUseGVN);
SetChangesFlag(kNewSpacePromotion);
}
bool IsDeletable() const override {
return !value()->ToNumberCanBeObserved();
}
};
class HTypeof final : public HTemplateInstruction<2> {
public:
DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P1(HTypeof, HValue*);
HValue* context() const { return OperandAt(0); }
HValue* value() const { return OperandAt(1); }
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
DECLARE_CONCRETE_INSTRUCTION(Typeof)
private:
explicit HTypeof(HValue* context, HValue* value) {
SetOperandAt(0, context);
SetOperandAt(1, value);
set_representation(Representation::Tagged());
}
bool IsDeletable() const override { return true; }
};
class HTrapAllocationMemento final : public HTemplateInstruction<1> {
public:
DECLARE_INSTRUCTION_FACTORY_P1(HTrapAllocationMemento, HValue*);
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
HValue* object() { return OperandAt(0); }
DECLARE_CONCRETE_INSTRUCTION(TrapAllocationMemento)
private:
explicit HTrapAllocationMemento(HValue* obj) {
SetOperandAt(0, obj);
}
};
class HMaybeGrowElements final : public HTemplateInstruction<5> {
public:
DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P6(HMaybeGrowElements, HValue*,
HValue*, HValue*, HValue*, bool,
ElementsKind);
Representation RequiredInputRepresentation(int index) override {
if (index < 3) {
return Representation::Tagged();
}
DCHECK(index == 3 || index == 4);
return Representation::Integer32();
}
HValue* context() const { return OperandAt(0); }
HValue* object() const { return OperandAt(1); }
HValue* elements() const { return OperandAt(2); }
HValue* key() const { return OperandAt(3); }
HValue* current_capacity() const { return OperandAt(4); }
bool is_js_array() const { return is_js_array_; }
ElementsKind kind() const { return kind_; }
DECLARE_CONCRETE_INSTRUCTION(MaybeGrowElements)
protected:
bool DataEquals(HValue* other) override { return true; }
private:
explicit HMaybeGrowElements(HValue* context, HValue* object, HValue* elements,
HValue* key, HValue* current_capacity,
bool is_js_array, ElementsKind kind) {
is_js_array_ = is_js_array;
kind_ = kind;
SetOperandAt(0, context);
SetOperandAt(1, object);
SetOperandAt(2, elements);
SetOperandAt(3, key);
SetOperandAt(4, current_capacity);
SetFlag(kUseGVN);
SetChangesFlag(kElementsPointer);
SetChangesFlag(kNewSpacePromotion);
set_representation(Representation::Tagged());
}
bool is_js_array_;
ElementsKind kind_;
};
class HSeqStringGetChar final : public HTemplateInstruction<2> {
public:
static HInstruction* New(Isolate* isolate, Zone* zone, HValue* context,
String::Encoding encoding, HValue* string,
HValue* index);
Representation RequiredInputRepresentation(int index) override {
return (index == 0) ? Representation::Tagged()
: Representation::Integer32();
}
String::Encoding encoding() const { return encoding_; }
HValue* string() const { return OperandAt(0); }
HValue* index() const { return OperandAt(1); }
DECLARE_CONCRETE_INSTRUCTION(SeqStringGetChar)
protected:
bool DataEquals(HValue* other) override {
return encoding() == HSeqStringGetChar::cast(other)->encoding();
}
Range* InferRange(Zone* zone) override {
if (encoding() == String::ONE_BYTE_ENCODING) {
return new(zone) Range(0, String::kMaxOneByteCharCode);
} else {
DCHECK_EQ(String::TWO_BYTE_ENCODING, encoding());
return new(zone) Range(0, String::kMaxUtf16CodeUnit);
}
}
private:
HSeqStringGetChar(String::Encoding encoding,
HValue* string,
HValue* index) : encoding_(encoding) {
SetOperandAt(0, string);
SetOperandAt(1, index);
set_representation(Representation::Integer32());
SetFlag(kUseGVN);
SetDependsOnFlag(kStringChars);
}
bool IsDeletable() const override { return true; }
String::Encoding encoding_;
};
class HSeqStringSetChar final : public HTemplateInstruction<4> {
public:
DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P4(
HSeqStringSetChar, String::Encoding,
HValue*, HValue*, HValue*);
String::Encoding encoding() { return encoding_; }
HValue* context() { return OperandAt(0); }
HValue* string() { return OperandAt(1); }
HValue* index() { return OperandAt(2); }
HValue* value() { return OperandAt(3); }
Representation RequiredInputRepresentation(int index) override {
return (index <= 1) ? Representation::Tagged()
: Representation::Integer32();
}
DECLARE_CONCRETE_INSTRUCTION(SeqStringSetChar)
private:
HSeqStringSetChar(HValue* context,
String::Encoding encoding,
HValue* string,
HValue* index,
HValue* value) : encoding_(encoding) {
SetOperandAt(0, context);
SetOperandAt(1, string);
SetOperandAt(2, index);
SetOperandAt(3, value);
set_representation(Representation::Tagged());
SetChangesFlag(kStringChars);
}
String::Encoding encoding_;
};
class HCheckMapValue final : public HTemplateInstruction<2> {
public:
DECLARE_INSTRUCTION_FACTORY_P2(HCheckMapValue, HValue*, HValue*);
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
HType CalculateInferredType() override {
if (value()->type().IsHeapObject()) return value()->type();
return HType::HeapObject();
}
HValue* value() const { return OperandAt(0); }
HValue* map() const { return OperandAt(1); }
HValue* Canonicalize() override;
DECLARE_CONCRETE_INSTRUCTION(CheckMapValue)
protected:
int RedefinedOperandIndex() override { return 0; }
bool DataEquals(HValue* other) override { return true; }
private:
HCheckMapValue(HValue* value, HValue* map)
: HTemplateInstruction<2>(HType::HeapObject()) {
SetOperandAt(0, value);
SetOperandAt(1, map);
set_representation(Representation::Tagged());
SetFlag(kUseGVN);
SetDependsOnFlag(kMaps);
SetDependsOnFlag(kElementsKind);
}
};
class HForInPrepareMap final : public HTemplateInstruction<2> {
public:
DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P1(HForInPrepareMap, HValue*);
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
HValue* context() const { return OperandAt(0); }
HValue* enumerable() const { return OperandAt(1); }
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
HType CalculateInferredType() override { return HType::Tagged(); }
DECLARE_CONCRETE_INSTRUCTION(ForInPrepareMap);
private:
HForInPrepareMap(HValue* context,
HValue* object) {
SetOperandAt(0, context);
SetOperandAt(1, object);
set_representation(Representation::Tagged());
SetAllSideEffects();
}
};
class HForInCacheArray final : public HTemplateInstruction<2> {
public:
DECLARE_INSTRUCTION_FACTORY_P3(HForInCacheArray, HValue*, HValue*, int);
Representation RequiredInputRepresentation(int index) override {
return Representation::Tagged();
}
HValue* enumerable() const { return OperandAt(0); }
HValue* map() const { return OperandAt(1); }
int idx() const { return idx_; }
HForInCacheArray* index_cache() {
return index_cache_;
}
void set_index_cache(HForInCacheArray* index_cache) {
index_cache_ = index_cache;
}
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
HType CalculateInferredType() override { return HType::Tagged(); }
DECLARE_CONCRETE_INSTRUCTION(ForInCacheArray);
private:
HForInCacheArray(HValue* enumerable,
HValue* keys,
int idx) : idx_(idx) {
SetOperandAt(0, enumerable);
SetOperandAt(1, keys);
set_representation(Representation::Tagged());
}
int idx_;
HForInCacheArray* index_cache_;
};
class HLoadFieldByIndex final : public HTemplateInstruction<2> {
public:
DECLARE_INSTRUCTION_FACTORY_P2(HLoadFieldByIndex, HValue*, HValue*);
HLoadFieldByIndex(HValue* object,
HValue* index) {
SetOperandAt(0, object);
SetOperandAt(1, index);
SetChangesFlag(kNewSpacePromotion);
set_representation(Representation::Tagged());
}
Representation RequiredInputRepresentation(int index) override {
if (index == 1) {
return Representation::Smi();
} else {
return Representation::Tagged();
}
}
HValue* object() const { return OperandAt(0); }
HValue* index() const { return OperandAt(1); }
std::ostream& PrintDataTo(std::ostream& os) const override; // NOLINT
HType CalculateInferredType() override { return HType::Tagged(); }
DECLARE_CONCRETE_INSTRUCTION(LoadFieldByIndex);
private:
bool IsDeletable() const override { return true; }
};
#undef DECLARE_INSTRUCTION
#undef DECLARE_CONCRETE_INSTRUCTION
} // namespace internal
} // namespace v8
#endif // V8_CRANKSHAFT_HYDROGEN_INSTRUCTIONS_H_