This pass computes, caches, and vends lazy value constraint information. More...

#include "llvm/Analysis/LazyValueInfo.h"

Public Types
enum	Tristate { Unknown = -1, False = 0, True = 1 }
	This is used to return true/false/dunno results. More...

Public Member Functions
	~LazyValueInfo ()

	LazyValueInfo ()

	LazyValueInfo (AssumptionCache AC_, const DataLayout DL_, TargetLibraryInfo *TLI_)

	LazyValueInfo (LazyValueInfo &&Arg)

LazyValueInfo &	operator= (LazyValueInfo &&Arg)

Tristate	getPredicateOnEdge (unsigned Pred, Value V, Constant C, BasicBlock FromBB, BasicBlock ToBB, Instruction *CxtI=nullptr)
	Determine whether the specified value comparison with a constant is known to be true or false on the specified CFG edge. More...

Tristate	getPredicateAt (unsigned Pred, Value V, Constant C, Instruction *CxtI)
	Determine whether the specified value comparison with a constant is known to be true or false at the specified instruction (from an assume intrinsic). More...

Constant *	getConstant (Value V, BasicBlock BB, Instruction *CxtI=nullptr)
	Determine whether the specified value is known to be a constant at the end of the specified block. More...

ConstantRange	getConstantRange (Value V, BasicBlock BB, Instruction *CxtI=nullptr, bool UndefAllowed=true)
	Return the ConstantRange constraint that is known to hold for the specified value at the end of the specified block. More...

Constant *	getConstantOnEdge (Value V, BasicBlock FromBB, BasicBlock ToBB, Instruction CxtI=nullptr)
	Determine whether the specified value is known to be a constant on the specified edge. More...

ConstantRange	getConstantRangeOnEdge (Value V, BasicBlock FromBB, BasicBlock ToBB, Instruction CxtI=nullptr)
	Return the ConstantRage constraint that is known to hold for the specified value on the specified edge. More...

void	threadEdge (BasicBlock PredBB, BasicBlock OldSucc, BasicBlock *NewSucc)
	Inform the analysis cache that we have threaded an edge from PredBB to OldSucc to be from PredBB to NewSucc instead. More...

void	eraseBlock (BasicBlock *BB)
	Inform the analysis cache that we have erased a block. More...

void	printLVI (Function &F, DominatorTree &DTree, raw_ostream &OS)
	Print the Analysis. More...

void	releaseMemory ()

bool	invalidate (Function &F, const PreservedAnalyses &PA, FunctionAnalysisManager::Invalidator &Inv)
	Handle invalidation events in the new pass manager. More...

Friends
class	LazyValueInfoWrapperPass

Detailed Description

This pass computes, caches, and vends lazy value constraint information.

Definition at line 31 of file LazyValueInfo.h.

Member Enumeration Documentation

◆ Tristate

enum llvm::LazyValueInfo::Tristate

This is used to return true/false/dunno results.

Enumerator
Unknown
False
True

Definition at line 60 of file LazyValueInfo.h.

Constructor & Destructor Documentation

◆ ~LazyValueInfo()

LazyValueInfo::~LazyValueInfo ( )

Definition at line 1543 of file LazyValueInfo.cpp.

References llvm::LazyValueInfoWrapperPass::releaseMemory().

◆ LazyValueInfo() [1/3]

llvm::LazyValueInfo::LazyValueInfo ( )

inline

Definition at line 41 of file LazyValueInfo.h.

◆ LazyValueInfo() [2/3]

llvm::LazyValueInfo::LazyValueInfo	(	AssumptionCache *	AC_,
		const DataLayout *	DL_,
		TargetLibraryInfo *	TLI_
	)

inline

Definition at line 42 of file LazyValueInfo.h.

◆ LazyValueInfo() [3/3]

llvm::LazyValueInfo::LazyValueInfo ( LazyValueInfo && Arg )

inline

Definition at line 45 of file LazyValueInfo.h.

References Arg.

Member Function Documentation

◆ eraseBlock()

void LazyValueInfo::eraseBlock ( BasicBlock * BB )

Inform the analysis cache that we have erased a block.

Definition at line 1852 of file LazyValueInfo.cpp.

References getImpl(), and llvm::BasicBlock::getModule().

Referenced by llvm::createLowerSwitchPass().

◆ getConstant()

Constant * LazyValueInfo::getConstant	(	Value *	V,
		BasicBlock *	BB,
		Instruction *	CxtI = `nullptr`
	)

Determine whether the specified value is known to be a constant at the end of the specified block.

Return null if not.

Definition at line 1588 of file LazyValueInfo.cpp.

References llvm::ConstantInt::get(), llvm::ValueLatticeElement::getConstant(), llvm::ValueLatticeElement::getConstantRange(), llvm::Value::getContext(), getImpl(), llvm::BasicBlock::getModule(), llvm::ConstantRange::getSingleElement(), llvm::ValueLatticeElement::isConstant(), llvm::ValueLatticeElement::isConstantRange(), and isKnownNonConstant().

Referenced by getConstantAt(), processCallSite(), processMemAccess(), and processSelect().

◆ getConstantOnEdge()

Constant * LazyValueInfo::getConstantOnEdge	(	Value *	V,
		BasicBlock *	FromBB,
		BasicBlock *	ToBB,
		Instruction *	CxtI = `nullptr`
	)

Determine whether the specified value is known to be a constant on the specified edge.

Return null if not.

Definition at line 1627 of file LazyValueInfo.cpp.

References llvm::ConstantInt::get(), llvm::ValueLatticeElement::getConstant(), llvm::ValueLatticeElement::getConstantRange(), llvm::Value::getContext(), getImpl(), llvm::BasicBlock::getModule(), llvm::ConstantRange::getSingleElement(), llvm::ValueLatticeElement::isConstant(), and llvm::ValueLatticeElement::isConstantRange().

Referenced by processPHI(), and simplifyCommonValuePhi().

◆ getConstantRange()

ConstantRange LazyValueInfo::getConstantRange	(	Value *	V,
		BasicBlock *	BB,
		Instruction *	CxtI = `nullptr`,
		bool	UndefAllowed = `true`
	)

Return the ConstantRange constraint that is known to hold for the specified value at the end of the specified block.

This may only be called on integer-typed Values.

Definition at line 1607 of file LazyValueInfo.cpp.

References assert(), llvm::ValueLatticeElement::getConstant(), llvm::ValueLatticeElement::getConstantRange(), getImpl(), llvm::Type::getIntegerBitWidth(), llvm::BasicBlock::getModule(), llvm::Value::getType(), llvm::ValueLatticeElement::isConstant(), llvm::ValueLatticeElement::isConstantRange(), llvm::Type::isIntegerTy(), and llvm::ValueLatticeElement::isUnknown().

Referenced by llvm::AAMemoryLocation::getMemoryLocationsAsStr(), processAnd(), processBinOp(), processUDivOrURem(), and willNotOverflow().

◆ getConstantRangeOnEdge()

ConstantRange LazyValueInfo::getConstantRangeOnEdge	(	Value *	V,
		BasicBlock *	FromBB,
		BasicBlock *	ToBB,
		Instruction *	CxtI = `nullptr`
	)

Return the ConstantRage constraint that is known to hold for the specified value on the specified edge.

This may be only be called on integer-typed Values.

Definition at line 1644 of file LazyValueInfo.cpp.

References assert(), llvm::ValueLatticeElement::getConstant(), llvm::ValueLatticeElement::getConstantRange(), getImpl(), llvm::Type::getIntegerBitWidth(), llvm::BasicBlock::getModule(), llvm::Value::getType(), llvm::ValueLatticeElement::isConstant(), llvm::ValueLatticeElement::isConstantRange(), and llvm::ValueLatticeElement::isUnknown().

◆ getPredicateAt()

LazyValueInfo::Tristate LazyValueInfo::getPredicateAt	(	unsigned	Pred,
		Value *	V,
		Constant *	C,
		Instruction *	CxtI
	)

Determine whether the specified value comparison with a constant is known to be true or false at the specified instruction (from an assume intrinsic).

Pred is a CmpInst predicate.

Definition at line 1743 of file LazyValueInfo.cpp.

References DL, llvm::numbers::e, False, llvm::Module::getDataLayout(), getImpl(), llvm::Instruction::getModule(), llvm::Instruction::getParent(), getParent(), getPredicateResult(), llvm::Value::getType(), llvm::CmpInst::ICMP_EQ, llvm::CmpInst::ICMP_NE, llvm::isKnownNonZero(), llvm::Constant::isNullValue(), llvm::Type::isPointerTy(), llvm::pred_begin(), llvm::pred_end(), llvm::MipsISD::Ret, llvm::Value::stripPointerCastsSameRepresentation(), True, and llvm::Unknown.

Referenced by getConstantAt(), hasPositiveOperands(), processAShr(), processCallSite(), processCmp(), and processSExt().

◆ getPredicateOnEdge()

LazyValueInfo::Tristate LazyValueInfo::getPredicateOnEdge	(	unsigned	Pred,
		Value *	V,
		Constant *	C,
		BasicBlock *	FromBB,
		BasicBlock *	ToBB,
		Instruction *	CxtI = `nullptr`
	)

Determine whether the specified value comparison with a constant is known to be true or false on the specified CFG edge.

Pred is a CmpInst predicate.

Definition at line 1732 of file LazyValueInfo.cpp.

References llvm::Module::getDataLayout(), getImpl(), llvm::BasicBlock::getModule(), and getPredicateResult().

Referenced by processPHI(), and processSwitch().

◆ invalidate()

bool LazyValueInfo::invalidate	(	Function &	F,
		const PreservedAnalyses &	PA,
		FunctionAnalysisManager::Invalidator &	Inv
	)

Handle invalidation events in the new pass manager.

Definition at line 1553 of file LazyValueInfo.cpp.

References llvm::PreservedAnalyses::getChecker().

◆ operator=()

LazyValueInfo& llvm::LazyValueInfo::operator= ( LazyValueInfo && Arg )

inline

Definition at line 49 of file LazyValueInfo.h.

References Arg, and releaseMemory().

◆ printLVI()

void LazyValueInfo::printLVI	(	Function &	F,
		DominatorTree &	DTree,
		raw_ostream &	OS
	)

Print the Analysis.

We pass in the DTree that is required for identifying which basic blocks we can solve/print for, in the LVIPrinter.

Definition at line 1859 of file LazyValueInfo.cpp.

References llvm::AnalysisUsage::addRequired(), Arg, llvm::dbgs(), F(), llvm::FunctionPass::FunctionPass(), llvm::LazyValueInfoWrapperPass::getAnalysisUsage(), getImpl(), llvm::LazyValueInfoWrapperPass::getLVI(), llvm::Value::getName(), llvm::Instruction::getParent(), llvm::BasicBlock::getParent(), llvm::GlobalValue::getParent(), llvm::PassRegistry::getPassRegistry(), llvm::LazyValueInfoWrapperPass::ID, INITIALIZE_PASS_BEGIN(), INITIALIZE_PASS_DEPENDENCY(), llvm::initializeLazyValueInfoPrinterPass(), llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::ValueLatticeElement::isUnknown(), llvm::Value::printAsOperand(), llvm::LazyValueInfoWrapperPass::runOnFunction(), llvm::AnalysisUsage::setPreservesAll(), llvm::successors(), and llvm::Value::users().

◆ releaseMemory()

void LazyValueInfo::releaseMemory ( )

Definition at line 1545 of file LazyValueInfo.cpp.

References getImpl().

Referenced by operator=(), and llvm::LazyValueInfoWrapperPass::~LazyValueInfoWrapperPass().

◆ threadEdge()

void LazyValueInfo::threadEdge	(	BasicBlock *	PredBB,
		BasicBlock *	OldSucc,
		BasicBlock *	NewSucc
	)

Inform the analysis cache that we have threaded an edge from PredBB to OldSucc to be from PredBB to NewSucc instead.

Definition at line 1844 of file LazyValueInfo.cpp.

References getImpl(), and llvm::BasicBlock::getModule().

Friends And Related Function Documentation

◆ LazyValueInfoWrapperPass

friend class LazyValueInfoWrapperPass

friend

Definition at line 32 of file LazyValueInfo.h.

The documentation for this class was generated from the following files:

include/llvm/Analysis/LazyValueInfo.h
lib/Analysis/LazyValueInfo.cpp

Public Types

Public Member Functions

Friends

Detailed Description

Member Enumeration Documentation

◆ Tristate

Constructor & Destructor Documentation

◆ ~LazyValueInfo()

◆ LazyValueInfo() [1/3]

◆ LazyValueInfo() [2/3]

◆ LazyValueInfo() [3/3]

Member Function Documentation

◆ eraseBlock()

◆ getConstant()

◆ getConstantOnEdge()

◆ getConstantRange()

◆ getConstantRangeOnEdge()

◆ getPredicateAt()

◆ getPredicateOnEdge()

◆ invalidate()

◆ operator=()

◆ printLVI()

◆ releaseMemory()

◆ threadEdge()

Friends And Related Function Documentation

◆ LazyValueInfoWrapperPass