libsanitizer/ubsan/ubsan_type_hash.cpp

   1 //===-- ubsan_type_hash.cpp -----------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // Implementation of a hash table for fast checking of inheritance
  10 // relationships. This file is only linked into C++ compilations, and is
  11 // permitted to use language features which require a C++ ABI library.
  12 //
  13 // Most of the implementation lives in an ABI-specific source file
  14 // (ubsan_type_hash_{itanium,win}.cpp).
  15 //
  16 //===----------------------------------------------------------------------===//
  17
  18 #include "ubsan_platform.h"
  19 #if CAN_SANITIZE_UB
  20 #include "ubsan_type_hash.h"
  21
  22 #include "sanitizer_common/sanitizer_common.h"
  23
  24 /// A cache of recently-checked hashes. Mini hash table with "random" evictions.
  25 __ubsan::HashValue
  26 __ubsan::__ubsan_vptr_type_cache[__ubsan::VptrTypeCacheSize];
  27
  28 __ubsan::DynamicTypeInfo __ubsan::getDynamicTypeInfoFromObject(void *Object) {
  29   void *VtablePtr = *reinterpret_cast<void **>(Object);
  30   return getDynamicTypeInfoFromVtable(VtablePtr);
  31 }
  32
  33 #endif  // CAN_SANITIZE_UB