Abstract Attribute helper functions. More...

Namespaces
namespace	PointerInfo

Classes
struct	RangeTy
	Helper to represent an access offset and size, with logic to deal with uncertainty and check for overlapping accesses. More...

struct	ValueAndContext

Typedefs
using	InstExclusionSetTy = SmallPtrSet< Instruction *, 4 >

Enumerations
enum class	GPUAddressSpace : unsigned { Generic = 0 , Global = 1 , Shared = 3 , Constant = 4 , Local = 5 }

enum	ValueScope : uint8_t { Intraprocedural = 1 , Interprocedural = 2 , AnyScope = Intraprocedural \| Interprocedural }
	Flags to distinguish intra-procedural queries from potentially inter-procedural queries. More...

Functions
bool	isGPU (const Module &M)
	Return true iff `M` target a GPU (and we can use GPU AS reasoning).

bool	isNoSyncInst (Attributor &A, const Instruction &I, const AbstractAttribute &QueryingAA)
	Return true if `I` is a `nosync` instruction.

bool	isDynamicallyUnique (Attributor &A, const AbstractAttribute &QueryingAA, const Value &V, bool ForAnalysisOnly=true)
	Return true if `V` is dynamically unique, that is, there are no two "instances" of `V` at runtime with different values.

bool	isValidInScope (const Value &V, const Function *Scope)
	Return true if `V` is a valid value in `Scope`, that is a constant or an instruction/argument of `Scope`.

bool	isValidAtPosition (const ValueAndContext &VAC, InformationCache &InfoCache)
	Return true if the value of `VAC` is a valid at the position of `VAC`, that is a constant, an argument of the same function, or an instruction in that function that dominates the position.

Value *	getWithType (Value &V, Type &Ty)
	Try to convert `V` to type `Ty` without introducing new instructions.

std::optional< Value * >	combineOptionalValuesInAAValueLatice (const std::optional< Value * > &A, const std::optional< Value * > &B, Type *Ty)
	Return the combination of `A` and `B` such that the result is a possible value of both.

raw_ostream &	operator<< (raw_ostream &OS, const RangeTy &R)

bool	operator== (const RangeTy &A, const RangeTy &B)

bool	operator!= (const RangeTy &A, const RangeTy &B)

Constant *	getInitialValueForObj (Attributor &A, const AbstractAttribute &QueryingAA, Value &Obj, Type &Ty, const TargetLibraryInfo TLI, const DataLayout &DL, RangeTy RangePtr=nullptr)
	Return the initial value of `Obj` with type `Ty` if that is a constant.

bool	getPotentiallyLoadedValues (Attributor &A, LoadInst &LI, SmallSetVector< Value , 4 > &PotentialValues, SmallSetVector< Instruction , 4 > &PotentialValueOrigins, const AbstractAttribute &QueryingAA, bool &UsedAssumedInformation, bool OnlyExact=false)
	Collect all potential values `LI` could read into `PotentialValues`.

bool	getPotentialCopiesOfStoredValue (Attributor &A, StoreInst &SI, SmallSetVector< Value *, 4 > &PotentialCopies, const AbstractAttribute &QueryingAA, bool &UsedAssumedInformation, bool OnlyExact=false)
	Collect all potential values of the one stored by `SI` into `PotentialCopies`.

bool	isAssumedReadOnly (Attributor &A, const IRPosition &IRP, const AbstractAttribute &QueryingAA, bool &IsKnown)
	Return true if `IRP` is readonly.

bool	isAssumedReadNone (Attributor &A, const IRPosition &IRP, const AbstractAttribute &QueryingAA, bool &IsKnown)
	Return true if `IRP` is readnone.

bool	isPotentiallyReachable (Attributor &A, const Instruction &FromI, const Instruction &ToI, const AbstractAttribute &QueryingAA, const AA::InstExclusionSetTy *ExclusionSet=nullptr, std::function< bool(const Function &F)> GoBackwardsCB=nullptr)
	Return true if `ToI` is potentially reachable from `FromI` without running into any instruction in `ExclusionSet` The two instructions do not need to be in the same function.

bool	isPotentiallyReachable (Attributor &A, const Instruction &FromI, const Function &ToFn, const AbstractAttribute &QueryingAA, const AA::InstExclusionSetTy *ExclusionSet=nullptr, std::function< bool(const Function &F)> GoBackwardsCB=nullptr)
	Same as above but it is sufficient to reach any instruction in `ToFn`.

bool	isAssumedThreadLocalObject (Attributor &A, Value &Obj, const AbstractAttribute &QueryingAA)
	Return true if `Obj` is assumed to be a thread local object.

bool	isPotentiallyAffectedByBarrier (Attributor &A, const Instruction &I, const AbstractAttribute &QueryingAA)
	Return true if `I` is potentially affected by a barrier.

bool	isPotentiallyAffectedByBarrier (Attributor &A, ArrayRef< const Value * > Ptrs, const AbstractAttribute &QueryingAA, const Instruction *CtxI)

template<Attribute::AttrKind AK, typename AAType = AbstractAttribute>
bool	hasAssumedIRAttr (Attributor &A, const AbstractAttribute QueryingAA, const IRPosition &IRP, DepClassTy DepClass, bool &IsKnown, bool IgnoreSubsumingPositions=false, const AAType *AAPtr=nullptr)
	Helper to avoid creating an AA for IR Attributes that might already be set.

Detailed Description

Abstract Attribute helper functions.

Typedef Documentation

◆ InstExclusionSetTy

using llvm::AA::InstExclusionSetTy = typedef SmallPtrSet<Instruction *, 4>

Definition at line 163 of file Attributor.h.

Enumeration Type Documentation

◆ GPUAddressSpace

enum class llvm::AA::GPUAddressSpace : unsigned

strong

Enumerator
Generic
Global
Shared
Constant
Local

Definition at line 165 of file Attributor.h.

◆ ValueScope

enum llvm::AA::ValueScope : uint8_t

Flags to distinguish intra-procedural queries from potentially inter-procedural queries.

Not that information can be valid for both and therefore both bits might be set.

Enumerator
Intraprocedural
Interprocedural
AnyScope

Definition at line 179 of file Attributor.h.

Function Documentation

◆ combineOptionalValuesInAAValueLatice()

std::optional< Value * > llvm::AA::combineOptionalValuesInAAValueLatice	(	const std::optional< Value * > &	A,
		const std::optional< Value * > &	B,
		Type *	Ty
	)

Return the combination of A and B such that the result is a possible value of both.

B is potentially casted to match the type Ty or the type of A if Ty is null.

Examples: X + none => X not_none + undef => not_none V1 + V2 => nullptr

Definition at line 340 of file Attributor.cpp.

References A, B, and getWithType().

Referenced by llvm::AAPotentialValues::getSingleValue(), llvm::AAPointerInfo::Access::operator&=(), and llvm::ValueSimplifyStateType::unionAssumed().

◆ getInitialValueForObj()

Constant * llvm::AA::getInitialValueForObj	(	Attributor &	A,
		const AbstractAttribute &	QueryingAA,
		Value &	Obj,
		Type &	Ty,
		const TargetLibraryInfo *	TLI,
		const DataLayout &	DL,
		AA::RangeTy *	RangePtr = `nullptr`
	)

Return the initial value of Obj with type Ty if that is a constant.

Definition at line 243 of file Attributor.cpp.

References A, llvm::ConstantFoldLoadFromConst(), llvm::ConstantFoldLoadFromUniformValue(), DL, llvm::UndefValue::get(), llvm::getInitialValueOfAllocation(), llvm::AA::RangeTy::Offset, llvm::Offset, and llvm::AA::RangeTy::offsetOrSizeAreUnknown().

Referenced by getPotentialCopiesOfMemoryValue().

◆ getPotentialCopiesOfStoredValue()

bool llvm::AA::getPotentialCopiesOfStoredValue	(	Attributor &	A,
		StoreInst &	SI,
		SmallSetVector< Value *, 4 > &	PotentialCopies,
		const AbstractAttribute &	QueryingAA,
		bool &	UsedAssumedInformation,
		bool	OnlyExact = `false`
	)

Collect all potential values of the one stored by SI into PotentialCopies.

That is, the only copies that were made via the store are assumed to be known and all are in PotentialCopies. Dependences onto QueryingAA are properly tracked, UsedAssumedInformation will inform the caller if assumed information was used.

Returns: True if the assumed potential copies are all in PotentialCopies, false if something went wrong and the copies could not be determined.

Definition at line 600 of file Attributor.cpp.

References A, and getPotentialCopiesOfMemoryValue().

Referenced by llvm::Attributor::checkForAllUses().

◆ getPotentiallyLoadedValues()

bool llvm::AA::getPotentiallyLoadedValues	(	Attributor &	A,
		LoadInst &	LI,
		SmallSetVector< Value *, 4 > &	PotentialValues,
		SmallSetVector< Instruction *, 4 > &	PotentialValueOrigins,
		const AbstractAttribute &	QueryingAA,
		bool &	UsedAssumedInformation,
		bool	OnlyExact = `false`
	)

Collect all potential values LI could read into PotentialValues.

That is, the only values read by LI are assumed to be known and all are in PotentialValues. PotentialValueOrigins will contain all the instructions that might have put a potential value into PotentialValues. Dependences onto QueryingAA are properly tracked, UsedAssumedInformation will inform the caller if assumed information was used.

Returns: True if the assumed potential copies are all in PotentialValues, false if something went wrong and the copies could not be determined.

Definition at line 590 of file Attributor.cpp.

References A, and getPotentialCopiesOfMemoryValue().

◆ getWithType()

Value * llvm::AA::getWithType	(	Value &	V,
		Type &	Ty
	)

Try to convert V to type Ty without introducing new instructions.

If this is not possible return nullptr. Note: this function basically knows how to cast various constants.

Definition at line 317 of file Attributor.cpp.

References llvm::CallingConv::C, llvm::ConstantFoldCastInstruction(), llvm::UndefValue::get(), llvm::PoisonValue::get(), llvm::Constant::getNullValue(), llvm::ConstantExpr::getPointerCast(), llvm::Type::getPrimitiveSizeInBits(), llvm::ConstantExpr::getTrunc(), llvm::Type::isFloatingPointTy(), llvm::Type::isIntegerTy(), and llvm::Type::isPointerTy().

Referenced by combineOptionalValuesInAAValueLatice(), llvm::AAValueConstantRange::getAssumedConstant(), llvm::AAPotentialConstantValues::getAssumedConstant(), and getPotentialCopiesOfMemoryValue().

◆ hasAssumedIRAttr()

template<Attribute::AttrKind AK, typename AAType = AbstractAttribute>

bool llvm::AA::hasAssumedIRAttr	(	Attributor &	A,
		const AbstractAttribute *	QueryingAA,
		const IRPosition &	IRP,
		DepClassTy	DepClass,
		bool &	IsKnown,
		bool	IgnoreSubsumingPositions = `false`,
		const AAType **	AAPtr = `nullptr`
	)

Helper to avoid creating an AA for IR Attributes that might already be set.

Definition at line 6425 of file Attributor.h.

References CASE, llvm_unreachable, llvm::AAMemoryBehavior::NO_ACCESSES, llvm::AAMemoryBehavior::NO_READS, and llvm::AAMemoryBehavior::NO_WRITES.

◆ isAssumedReadNone()

bool llvm::AA::isAssumedReadNone	(	Attributor &	A,
		const IRPosition &	IRP,
		const AbstractAttribute &	QueryingAA,
		bool &	IsKnown
	)

Return true if IRP is readnone.

This will query respective AAs that deduce the information and introduce dependences for QueryingAA.

Definition at line 654 of file Attributor.cpp.

References A, and isAssumedReadOnlyOrReadNone().

◆ isAssumedReadOnly()

bool llvm::AA::isAssumedReadOnly	(	Attributor &	A,
		const IRPosition &	IRP,
		const AbstractAttribute &	QueryingAA,
		bool &	IsKnown
	)

Return true if IRP is readonly.

This will query respective AAs that deduce the information and introduce dependences for QueryingAA.

Definition at line 649 of file Attributor.cpp.

References A, and isAssumedReadOnlyOrReadNone().

◆ isAssumedThreadLocalObject()

bool llvm::AA::isAssumedThreadLocalObject	(	Attributor &	A,
		Value &	Obj,
		const AbstractAttribute &	QueryingAA
	)

Return true if Obj is assumed to be a thread local object.

Definition at line 836 of file Attributor.cpp.

References A, llvm::dbgs(), llvm::Type::getPointerAddressSpace(), llvm::Value::getType(), LLVM_DEBUG, llvm::InformationCache::stackIsAccessibleByOtherThreads(), and llvm::IRPosition::value().

Referenced by isPotentiallyAffectedByBarrier().

◆ isDynamicallyUnique()

bool llvm::AA::isDynamicallyUnique	(	Attributor &	A,
		const AbstractAttribute &	QueryingAA,
		const Value &	V,
		bool	ForAnalysisOnly = `true`
	)

Return true if V is dynamically unique, that is, there are no two "instances" of V at runtime with different values.

Note: If ForAnalysisOnly is set we only check that the Attributor will never use V to represent two "instances" not that V could not technically represent them.

Definition at line 232 of file Attributor.cpp.

References A, llvm::AAInstanceInfo::isAssumedUniqueForAnalysis(), and llvm::IRPosition::value().

◆ isGPU()

bool llvm::AA::isGPU ( const Module & M )

Return true iff M target a GPU (and we can use GPU AS reasoning).

}

Definition at line 201 of file Attributor.cpp.

◆ isNoSyncInst()

bool llvm::AA::isNoSyncInst	(	Attributor &	A,
		const Instruction &	I,
		const AbstractAttribute &	QueryingAA
	)

Return true if I is a nosync instruction.

Use generic reasoning and potentially the corresponding AANoSync.

Definition at line 206 of file Attributor.cpp.

References A, llvm::IRPosition::callsite_function(), I, llvm::AANoSync::isNonRelaxedAtomic(), and llvm::AANoSync::isNoSyncIntrinsic().

◆ isPotentiallyAffectedByBarrier() [1/2]

bool llvm::AA::isPotentiallyAffectedByBarrier	(	Attributor &	A,
		ArrayRef< const Value * >	Ptrs,
		const AbstractAttribute &	QueryingAA,
		const Instruction *	CtxI
	)

Definition at line 919 of file Attributor.cpp.

References A, llvm::dbgs(), isAssumedThreadLocalObject(), LLVM_DEBUG, Ptr, and llvm::IRPosition::value().

◆ isPotentiallyAffectedByBarrier() [2/2]

bool llvm::AA::isPotentiallyAffectedByBarrier	(	Attributor &	A,
		const Instruction &	I,
		const AbstractAttribute &	QueryingAA
	)

Return true if I is potentially affected by a barrier.

Definition at line 890 of file Attributor.cpp.

References A, llvm::dbgs(), llvm::SetVector< T, Vector, Set, N >::getArrayRef(), llvm::MemoryLocation::getForDest(), llvm::MemoryLocation::getForSource(), llvm::MemoryLocation::getOrNone(), I, llvm::SetVector< T, Vector, Set, N >::insert(), isPotentiallyAffectedByBarrier(), LLVM_DEBUG, and MI.

Referenced by isPotentiallyAffectedByBarrier().

◆ isPotentiallyReachable() [1/2]

bool llvm::AA::isPotentiallyReachable	(	Attributor &	A,
		const Instruction &	FromI,
		const Function &	ToFn,
		const AbstractAttribute &	QueryingAA,
		const AA::InstExclusionSetTy *	ExclusionSet = `nullptr`,
		std::function< bool(const Function &F)>	GoBackwardsCB = `nullptr`
	)

Same as above but it is sufficient to reach any instruction in ToFn.

Definition at line 827 of file Attributor.cpp.

References A.

◆ isPotentiallyReachable() [2/2]

bool llvm::AA::isPotentiallyReachable	(	Attributor &	A,
		const Instruction &	FromI,
		const Instruction &	ToI,
		const AbstractAttribute &	QueryingAA,
		const AA::InstExclusionSetTy *	ExclusionSet = `nullptr`,
		std::function< bool(const Function &F)>	GoBackwardsCB = `nullptr`
	)

Return true if ToI is potentially reachable from FromI without running into any instruction in ExclusionSet The two instructions do not need to be in the same function.

GoBackwardsCB can be provided to convey domain knowledge about the "lifespan" the user is interested in. By default, the callers of FromI are checked as well to determine if ToI can be reached. If the query is not interested in callers beyond a certain point, e.g., a GPU kernel entry or the function containing an alloca, the GoBackwardsCB should return false.

Definition at line 817 of file Attributor.cpp.

References A, and llvm::Instruction::getFunction().

◆ isValidAtPosition()

bool llvm::AA::isValidAtPosition	(	const ValueAndContext &	VAC,
		InformationCache &	InfoCache
	)

Return true if the value of VAC is a valid at the position of VAC, that is a constant, an argument of the same function, or an instruction in that function that dominates the position.

Definition at line 291 of file Attributor.cpp.

References A, llvm::any_of(), llvm::InformationCache::getAnalysisResultForFunction(), llvm::AA::ValueAndContext::getCtxI(), llvm::Instruction::getFunction(), llvm::Instruction::getParent(), llvm::AA::ValueAndContext::getValue(), I, and llvm::make_range().

◆ isValidInScope()

bool llvm::AA::isValidInScope	(	const Value &	V,
		const Function *	Scope
	)

Return true if V is a valid value in Scope, that is a constant or an instruction/argument of Scope.

Definition at line 281 of file Attributor.cpp.

References A, and I.

Referenced by llvm::Attributor::getAssumedSimplifiedValues().

◆ operator!=()

bool llvm::AA::operator!=	(	const RangeTy &	A,
		const RangeTy &	B
	)

inline

Definition at line 322 of file Attributor.h.

References A, and B.

◆ operator<<()

raw_ostream & llvm::AA::operator<<	(	raw_ostream &	OS,
		const RangeTy &	R
	)

inline

Definition at line 313 of file Attributor.h.

References OS.

◆ operator==()

bool llvm::AA::operator==	(	const RangeTy &	A,
		const RangeTy &	B
	)

inline

Definition at line 318 of file Attributor.h.

References A, and B.

Namespaces

Classes

Typedefs

Enumerations

Functions

Detailed Description

Typedef Documentation

◆ InstExclusionSetTy

Enumeration Type Documentation

◆ GPUAddressSpace

◆ ValueScope

Function Documentation

◆ combineOptionalValuesInAAValueLatice()

◆ getInitialValueForObj()

◆ getPotentialCopiesOfStoredValue()

◆ getPotentiallyLoadedValues()

◆ getWithType()

◆ hasAssumedIRAttr()

◆ isAssumedReadNone()

◆ isAssumedReadOnly()

◆ isAssumedThreadLocalObject()

◆ isDynamicallyUnique()

◆ isGPU()

◆ isNoSyncInst()

◆ isPotentiallyAffectedByBarrier() [1/2]

◆ isPotentiallyAffectedByBarrier() [2/2]

◆ isPotentiallyReachable() [1/2]

◆ isPotentiallyReachable() [2/2]

◆ isValidAtPosition()

◆ isValidInScope()

◆ operator!=()

◆ operator<<()

◆ operator==()