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Jia Chen f7927cadda Teach the frontend to recognize STL throw wrappers ... Summary: : There are throw wrapper functions like `std::__throw_bad_alloc()` defined in both libstdc++ (https://github.com/gcc-mirror/gcc/blob/master/libstdc%2B%2B-v3/include/bits/functexcept.h) and libc++ (e.g. 907c1196a7/include/new (L145)). Folly actually exports some of them as well (diffusion/FBS/browse/master/fbcode/folly/portability/BitsFunctexcept.h). The function body of those wrappers merely throws the corresponding exception. My understanding is that the primary purpose of the wrappers is to throw the exception if everything goes well and to fall back to something reasonable when exception is disabled (e.g. when `-fno-exceptions` is passed to the compiler). The problem is that infer doesn't really understand what those functions do, and I've seen some false positives get reported as a result of it. So to remove those FPs we need to either model them or handle them specially. Modeling those wrappers by either whitelisting them or overriding the include files turns out to be difficult, as those wrappers are only declared but not defined in the STL headers. Their implementations are not available to Infer so whitelisting them does nothing, and if I provide custom implementations in the headers then normal compilation process will be disrupted because the linker would complain about duplicated implementation. What I did here is to replace functions whose name matches one of the throw wrapper's name with a `BuiltinDecls.exit`. I have to admit that this is a bit hacky: initially I was trying to do something more general: replacing functions with `noreturn` attribute with `BuitinDecls.exit`. That did not work because, CMIIW, the current frontend only exports function attributes for functions with actual bodies, not declaration-only functions. I'd love to be informed if there are better ways to handle those wrappers. Reviewed By: jeremydubreil Differential Revision: D5266030 fbshipit-source-id: 4580227		8 years ago
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attributes	[C++] Use annotate attribute instead of deprecated	8 years ago
conditional	Propagate C++ noexcept annotation from frontend to backend	8 years ago
constructors	Propagate C++ noexcept annotation from frontend to backend	8 years ago
exceptions	Propagate C++ noexcept annotation from frontend to backend	8 years ago
lambda	[Typ] Change Typ.pp_full to not include class keywords	8 years ago
methods	Propagate C++ noexcept annotation from frontend to backend	8 years ago
namespace	[Typ] Change Typ.pp_full to not include class keywords	8 years ago
nestedoperators	Populate mangled file only if it's not empty	8 years ago
npe	[Typ] Change Typ.pp_full to not include class keywords	8 years ago
reference	Propagate C++ noexcept annotation from frontend to backend	8 years ago
templates	Propagate C++ noexcept annotation from frontend to backend	8 years ago
types	Teach the frontend to recognize STL throw wrappers	8 years ago