[PATCH] D120310: [clang][analyzer] Add modeling of 'errno' (work-in-progress).

[Balázs Kéri via Phabricator via cfe-commits]

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Add a checker to maintain the system-defined value 'errno'.
The value is supposed to be set in the future by existing or
new checkers that evaluate errno-modifying function calls.

The patch is work-in-progress because the possible definitions
of `errno` on various implementations should be collected.
Some tests (dependent on these) are missing yet.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D120310

Files:
  clang/include/clang/StaticAnalyzer/Checkers/Checkers.td
  clang/include/clang/StaticAnalyzer/Core/PathSensitive/MemRegion.h
  clang/lib/StaticAnalyzer/Checkers/CMakeLists.txt
  clang/lib/StaticAnalyzer/Checkers/Errno.h
  clang/lib/StaticAnalyzer/Checkers/ErrnoChecker.cpp
  clang/lib/StaticAnalyzer/Core/MemRegion.cpp
  clang/test/Analysis/Inputs/errno_func.h
  clang/test/Analysis/Inputs/errno_var.h
  clang/test/Analysis/Inputs/system-header-simulator.h
  clang/test/Analysis/analyzer-enabled-checkers.c
  clang/test/Analysis/errno.c
  clang/test/Analysis/global-region-invalidation.c
  clang/test/Analysis/std-c-library-functions-arg-enabled-checkers.c

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