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Author SHA1 Message Date
Evgenii Stepanov
cb96464f12 Stricter use-after-dtor detection for trivial members. 
Poison trivial class members one-by-one in the reverse order of their
construction, instead of all-at-once at the very end.

For example, in the following code access to `x` from `~B` will
produce an undefined value.

struct A {
  struct B b;
  int x;
};

Reviewed By: kda

Differential Revision: https://reviews.llvm.org/D119600
 2022-03-16 18:20:27 -07:00
Vitaly Buka
3e1cb0db8a [CodeGen][MSan] Don't use offsets of zero-sized fields 
Such fields will likely have offset zero making
__sanitizer_dtor_callback poisoning wrong regions.
E.g. it can poison base class member from derived class constructor.

Differential Revision: https://reviews.llvm.org/D92727
 2020-12-07 13:37:40 -08:00
Vitaly Buka
452eddf30b [NFC][CodeGen] Add sanitize-dtor-zero-size-field test 
The test demonstrates invalid behaviour which will be fixed soon.
 2020-12-05 16:39:48 -08:00