Walks the defining accesses of MemoryDefs. More...

#include "llvm/Analysis/MemorySSA.h"

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

Collaboration 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< def_chain_iterator< T, UseOptimizedChain >, std::forward_iterator_tag, MemoryAccess *>
def_chain_iterator< T, UseOptimizedChain >	operator+ (std::ptrdiff_t n) const

def_chain_iterator< T, UseOptimizedChain >	operator- (std::ptrdiff_t n) const

def_chain_iterator< T, UseOptimizedChain > &	operator++ ()

def_chain_iterator< T, UseOptimizedChain >	operator++ (int)

def_chain_iterator< T, UseOptimizedChain > &	operator-- ()

def_chain_iterator< T, UseOptimizedChain >	operator-- (int)

bool	operator!= (const def_chain_iterator< T, UseOptimizedChain > &RHS) const

bool	operator> (const def_chain_iterator< T, UseOptimizedChain > &RHS) const

bool	operator<= (const def_chain_iterator< T, UseOptimizedChain > &RHS) const

bool	operator>= (const def_chain_iterator< T, UseOptimizedChain > &RHS) const

MemoryAccess * *	operator-> ()

MemoryAccess * *	operator-> () const

ReferenceProxy	operator[] (std::ptrdiff_t n)

ReferenceProxy	operator[] (std::ptrdiff_t n) const

Additional Inherited Members
Protected Types inherited from llvm::iterator_facade_base< def_chain_iterator< T, UseOptimizedChain >, std::forward_iterator_tag, MemoryAccess *>
enum

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 1262 of file MemorySSA.h.