[PATCH] D22525: [Sema] Add sizeof diagnostics for bzero

[Bruno Cardoso Lopes via cfe-commits]

bruno created this revision.
bruno added a reviewer: zaks.anna.
bruno added a subscriber: cfe-commits.

For memset (and others) we can get diagnostics like:

  struct stat { int x; };
  void foo(struct stat *stamps) {
    memset(stamps, 0, sizeof(stamps));
  }

  t.c:7:28: warning: 'memset' call operates on objects of type 'struct stat' while the size is based on a different type 'struct stat *' [-Wsizeof-pointer-memaccess]
    memset(stamps, 0, sizeof(stamps));
           ~~~~~~            ^~~~~~
  t.c:7:28: note: did you mean to dereference the argument to 'sizeof' (and multiply it by the number of elements)?
    memset(stamps, 0, sizeof(stamps));
                             ^~~~~~

This patch adds support for the same class of warnings for bzero.

https://reviews.llvm.org/D22525

Files:
  lib/AST/Decl.cpp
  lib/Sema/SemaChecking.cpp
  test/SemaCXX/warn-memset-bad-sizeof.cpp

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