Walks the defining accesses of MemoryDefs. More...

#include "llvm/Analysis/MemorySSA.h"

Inheritance diagram for llvm::def_chain_iterator< T, UseOptimizedChain >:

Public Member Functions
	def_chain_iterator ()

	def_chain_iterator (T MA)

T	operator* () const

def_chain_iterator &	operator++ ()

bool	operator== (const def_chain_iterator &O) const

Public Member Functions inherited from llvm::iterator_facade_base< DerivedT, IteratorCategoryT, T, DifferenceTypeT, PointerT, ReferenceT >
DerivedT	operator+ (DifferenceTypeT n) const

DerivedT	operator- (DifferenceTypeT n) const

DerivedT &	operator++ ()

DerivedT	operator++ (int)

DerivedT &	operator-- ()

DerivedT	operator-- (int)

bool	operator!= (const DerivedT &RHS) const

bool	operator> (const DerivedT &RHS) const

bool	operator<= (const DerivedT &RHS) const

bool	operator>= (const DerivedT &RHS) const

PointerProxy	operator-> () const

ReferenceProxy	operator[] (DifferenceTypeT n) const

Additional Inherited Members
Public Types inherited from llvm::iterator_facade_base< DerivedT, IteratorCategoryT, T, DifferenceTypeT, PointerT, ReferenceT >
using	iterator_category = IteratorCategoryT

using	value_type = T

using	difference_type = DifferenceTypeT

using	pointer = PointerT

using	reference = ReferenceT

Protected Types inherited from llvm::iterator_facade_base< DerivedT, IteratorCategoryT, T, DifferenceTypeT, PointerT, ReferenceT >
enum	{ IsRandomAccess , IsBidirectional }

Detailed Description

template<class T, bool UseOptimizedChain = false>
struct llvm::def_chain_iterator< T, UseOptimizedChain >

Walks the defining accesses of MemoryDefs.

Stops after we hit something that has no defining use (e.g. a MemoryPhi or liveOnEntry). Note that, when comparing against a null def_chain_iterator, this will compare equal only after walking said Phi/liveOnEntry.

The UseOptimizedChain flag specifies whether to walk the clobbering access chain, or all the accesses.

Normally, MemoryDef are all just def/use linked together, so a def_chain on a MemoryDef will walk all MemoryDefs above it in the program until it hits a phi node. The optimized chain walks the clobbering access of a store. So if you are just trying to find, given a store, what the next thing that would clobber the same memory is, you want the optimized chain.

Definition at line 1320 of file MemorySSA.h.