llvm::PHITransAddr Class Reference

PHITransAddr - An address value which tracks and handles phi translation. More...

#include "llvm/Analysis/PHITransAddr.h"

Public Member Functions
	PHITransAddr (Value *Addr, const DataLayout &DL, AssumptionCache *AC)
Value *	getAddr () const
bool	needsPHITranslationFromBlock (BasicBlock *BB) const
	needsPHITranslationFromBlock - Return true if moving from the specified BasicBlock to its predecessors requires PHI translation.
bool	isPotentiallyPHITranslatable () const
	isPotentiallyPHITranslatable - If this needs PHI translation, return true if we have some hope of doing it.
Value *	translateValue (BasicBlock *CurBB, BasicBlock *PredBB, const DominatorTree *DT, bool MustDominate)
	translateValue - PHI translate the current address up the CFG from CurBB to Pred, updating our state to reflect any needed changes.
Value *	translateWithInsertion (BasicBlock *CurBB, BasicBlock *PredBB, const DominatorTree &DT, SmallVectorImpl< Instruction * > &NewInsts)
	translateWithInsertion - PHI translate this value into the specified predecessor block, inserting a computation of the value if it is unavailable.
void	dump () const
bool	verify () const
	verify - Check internal consistency of this data structure.

Detailed Description

PHITransAddr - An address value which tracks and handles phi translation.

As we walk "up" the CFG through predecessors, we need to ensure that the address we're tracking is kept up to date. For example, if we're analyzing an address of "&A[i]" and walk through the definition of 'i' which is a PHI node, we must phi translate i to get "&A[j]" or else we will analyze an incorrect pointer in the predecessor block.

This is designed to be a relatively small object that lives on the stack and is copyable.

Definition at line 35 of file PHITransAddr.h.

Constructor & Destructor Documentation

PHITransAddr()

llvm::PHITransAddr::PHITransAddr ( Value *  Addr, const DataLayout &  DL, AssumptionCache *  AC  )

inline

Definition at line 52 of file PHITransAddr.h.

References Addr, and DL.

Member Function Documentation

dump()

LLVM_DUMP_METHOD void PHITransAddr::dump

(

)

const

Definition at line 40 of file PHITransAddr.cpp.

References llvm::dbgs().

getAddr()

Value * llvm::PHITransAddr::getAddr ( ) const

inline

Definition at line 58 of file PHITransAddr.h.

References Addr.

Referenced by memoryIsNotModifiedBetween().

isPotentiallyPHITranslatable()

bool PHITransAddr::isPotentiallyPHITranslatable

(

)

const

isPotentiallyPHITranslatable - If this needs PHI translation, return true if we have some hope of doing it.

This should be used as a filter to avoid calling PHITranslateValue in hopeless situations.

Definition at line 103 of file PHITransAddr.cpp.

References canPHITrans().

Referenced by memoryIsNotModifiedBetween().

needsPHITranslationFromBlock()

bool llvm::PHITransAddr::needsPHITranslationFromBlock ( BasicBlock *  BB ) const

inline

needsPHITranslationFromBlock - Return true if moving from the specified BasicBlock to its predecessors requires PHI translation.

Definition at line 62 of file PHITransAddr.h.

References llvm::any_of().

Referenced by memoryIsNotModifiedBetween().

translateValue()

Value * PHITransAddr::translateValue	(	BasicBlock *	CurBB,
		BasicBlock *	PredBB,
		const DominatorTree *	DT,
		bool	MustDominate
	)

translateValue - PHI translate the current address up the CFG from CurBB to Pred, updating our state to reflect any needed changes.

PHITranslateValue - PHI translate the current address up the CFG from CurBB to Pred, updating our state to reflect any needed changes.

If 'MustDominate' is true, the translated value must dominate PredBB.

Definition at line 298 of file PHITransAddr.cpp.

References assert(), llvm::DominatorTree::dominates(), llvm::Instruction::getParent(), llvm::DominatorTree::isReachableFromEntry(), and verify().

Referenced by memoryIsNotModifiedBetween().

translateWithInsertion()

Value * PHITransAddr::translateWithInsertion	(	BasicBlock *	CurBB,
		BasicBlock *	PredBB,
		const DominatorTree &	DT,
		SmallVectorImpl< Instruction * > &	NewInsts
	)

translateWithInsertion - PHI translate this value into the specified predecessor block, inserting a computation of the value if it is unavailable.

PHITranslateWithInsertion - PHI translate this value into the specified predecessor block, inserting a computation of the value if it is unavailable.

All newly created instructions are added to the NewInsts list. This returns null on failure.

Definition at line 326 of file PHITransAddr.cpp.

References llvm::SmallVectorImpl< T >::pop_back_val(), and llvm::SmallVectorBase< Size_T >::size().

verify()

bool PHITransAddr::verify

(

)

const

verify - Check internal consistency of this data structure.

If the structure is valid, it returns true. If invalid, it prints errors and returns false.

Definition at line 81 of file PHITransAddr.cpp.

References llvm::SmallVectorBase< Size_T >::empty(), llvm::errs(), llvm_unreachable, and verifySubExpr().

Referenced by translateValue().

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

• include/llvm/Analysis/PHITransAddr.h
• lib/Analysis/PHITransAddr.cpp