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Add macro LLVM_ATTRIBUTE_REINITIALIZES 

Summary:
This marks legitimate use-after-move (e.g. `Found.clear()` in rC342925)
which would otherwise be caught by bugprone-use-after-move.

bugprone-use-after-move recognizes this attribute after rCTE339571.

Reviewers: aaron.ballman, rsmith, mboehme, hokein

Reviewed By: mboehme

Subscribers: kristina, llvm-commits

Differential Revision: https://reviews.llvm.org/D52451

llvm-svn: 342949
This commit is contained in:
Fangrui Song 2018-09-25 08:06:32 +00:00
parent 86ecf46fb4
commit 037720ba4f
1 changed files with 13 additions and 0 deletions
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13
llvm/include/llvm/Support/Compiler.h
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@ -133,6 +133,19 @@
#define LLVM_NODISCARD #define LLVM_NODISCARD
#endif #endif
// Indicate that a non-static, non-const C++ member function reinitializes
// the entire object to a known state, independent of the previous state of
// the object.
//
// The clang-tidy check bugprone-use-after-move recognizes this attribute as a
// marker that a moved-from object has left the indeterminate state and can be
// reused.
#if __has_cpp_attribute(clang::reinitializes)
#define LLVM_ATTRIBUTE_REINITIALIZES [[clang::reinitializes]]
#else
#define LLVM_ATTRIBUTE_REINITIALIZES
#endif
// Some compilers warn about unused functions. When a function is sometimes // Some compilers warn about unused functions. When a function is sometimes
// used or not depending on build settings (e.g. a function only called from // used or not depending on build settings (e.g. a function only called from
// within "assert"), this attribute can be used to suppress such warnings. // within "assert"), this attribute can be used to suppress such warnings.