infer_clone

History

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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attributes	Populate mangled file only if it's not empty	8 years ago
builtin	Populate mangled file only if it's not empty	8 years ago
destructors	[clang] Add a preanalysis to compute nullability annotations	8 years ago
globals	[typ] Print type qualifiers in Typ.pp_full	8 years ago
include_header	Propagate C++ noexcept annotation from frontend to backend	8 years ago
keywords	[Typ] Change Typ.pp_full to not include class keywords	8 years ago
literals	Populate mangled file only if it's not empty	8 years ago
loops	Force emitting prune node for C++ comparison expressions	8 years ago
nestedoperators	[Typ] Change Typ.pp_full to not include class keywords	8 years ago
Makefile	[clang] Run direct tests with --no-failures-allowed flag	8 years ago
shared	[tests] Clean up test files shared between frontend and endtoend tests	8 years ago