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Jia Chen a6757be036 Force emitting prune node for C++ comparison expressions ... Summary: This diff tries to achieve the followings: if we have the following C++ codes: ``` bool foo(int x, int y) { return &x == &y; } ``` We want the C++ frontend to emit Sil as if the input is written as ``` bool foo(int x, int y) { if (&x == &y) return 1; else return 0; } ``` This matches the behavior of our Java frontend. The reason why we prefer an explicit branch is that it will force the backend to eagerly produce two different specs for `foo`. Without the explicit branch, for the above example the backend would produce one spec with `return = (&x == &y)` as the post condition, which is not ideal because (1) we don't want local variables to escape to the function summary, and (2) with the knowledge that no two local variables may alias each other, the backend could actually determines that `&x == &y` is always false, emitting a more precise postcondition `return = 0`. This is not possible if we do not eagerly resolve the comparison expression. Reviewed By: akotulski Differential Revision: D5260745 fbshipit-source-id: 6bbbf99		8 years ago
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errors	Force emitting prune node for C++ comparison expressions	8 years ago
frontend	[IR] add stride to array type	8 years ago
ioslints	[linters] Add option to blacklist the unavailable api check for some files	8 years ago
linters	[linters] Improve the error message in implicit cast error	8 years ago
linters-def-folder	[AL] Load AL files from a directory	8 years ago
linters-for-test-only	[linters] Global paths	8 years ago
quandary	[make] make sure makefile uses config-time values	8 years ago
shared	[clang] Add a preanalysis to compute nullability annotations	8 years ago