ubsan_type_hash.h revision 26a725f0b2fd30b98adae6353b432d0c955e10bd 
1//===-- ubsan_type_hash.h ---------------------------------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// Hashing of types for Clang's undefined behavior checker.
11//
12//===----------------------------------------------------------------------===//
13#ifndef UBSAN_TYPE_HASH_H
14#define UBSAN_TYPE_HASH_H
15
16#include "sanitizer_common/sanitizer_common.h"
17
18namespace __ubsan {
19
20typedef uptr HashValue;
21
22/// \brief Check whether the dynamic type of \p Object has a \p Type subobject
23/// at offset 0.
24/// \return \c true if the type matches, \c false if not.
25bool checkDynamicType(void *Object, void *Type, HashValue Hash);
26
27const unsigned VptrTypeCacheSize = 128;
28
29/// \brief A cache of the results of checkDynamicType. \c checkDynamicType would
30/// return \c true (modulo hash collisions) if
31/// \code
32///   __ubsan_vptr_type_cache[Hash % VptrTypeCacheSize] == Hash
33/// \endcode
34extern "C" HashValue __ubsan_vptr_type_cache[VptrTypeCacheSize];
35
36} // namespace __ubsan
37
38#endif // UBSAN_TYPE_HASH_H
39