2 Commits

Author	SHA1	Message	Date
John Brawn	980da83f84	[PhiValues] Use callback value handles to invalidate deleted values ... The way that PhiValues is integrated with BasicAA it is possible for a pass which uses BasicAA to pick up an instance of BasicAA that uses PhiValues without intending to, and then delete values from a function in a way that causes PhiValues to return dangling pointers to these deleted values. Fix this by having a set of callback value handles to invalidate values when they're deleted. llvm-svn: 340613	2018-08-24 15:48:30 +00:00
John Brawn	bdbbd8381f	Add a PhiValuesAnalysis pass to calculate the underlying values of phis ... This pass is being added in order to make the information available to BasicAA, which can't do caching of this information itself, but possibly this information may be useful for other passes. Incorporates code based on Daniel Berlin's implementation of Tarjan's algorithm. Differential Revision: https://reviews.llvm.org/D47893 llvm-svn: 335857	2018-06-28 14:13:06 +00:00