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Jules Villard d28d0528d1 [pulse] initial commit ... Summary: New analysis in foetal form to detect invalid use of C++ objects after their lifetime has ended. For now it has: - A domain consisting of a graph of abstract locations representing the heap, a map from program variables to abstract locations representing the stack, and a set of locations known to be invalid (their lifetime has ended) - The heap graph is unfolded lazily when we resolve accesses to the heap down to an abstract location. When we traverse a memory location we check that it's not known to be invalid. - A simple transfer function reads and updates the stack and heap in a rudimentary way for now - C++ `delete` is modeled as adding the location that its argument resolves to to the set of invalid locations - Also, the domain has a really crappy join and widening for now (see comments in the code) With this we already pass most of the "use after delete" tests from the Ownership checker. The ones we don't pass are only because we are missing models. Reviewed By: mbouaziz Differential Revision: D10383249 fbshipit-source-id: f414664cb		6 years ago
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man1	[pulse] initial commit	6 years ago