libsanitizer/sanitizer_common/sanitizer_redefine_builtins.h

   1 //===-- sanitizer_redefine_builtins.h ---------------------------*- C++ -*-===//
   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 // Redefine builtin functions to use internal versions. This is needed where
  10 // compiler optimizations end up producing unwanted libcalls!
  11 //
  12 //===----------------------------------------------------------------------===//
  13 #ifndef SANITIZER_COMMON_NO_REDEFINE_BUILTINS
  14 #  ifndef SANITIZER_REDEFINE_BUILTINS_H
  15 #    define SANITIZER_REDEFINE_BUILTINS_H
  16
  17 // The asm hack only works with GCC and Clang.
  18 #    if !defined(_WIN32) && defined(HAVE_AS_SYM_ASSIGN)
  19
  20 asm("memcpy = __sanitizer_internal_memcpy");
  21 asm("memmove = __sanitizer_internal_memmove");
  22 asm("memset = __sanitizer_internal_memset");
  23
  24 #      if defined(__cplusplus) && \
  25           !defined(SANITIZER_COMMON_REDEFINE_BUILTINS_IN_STD)
  26
  27 // The builtins should not be redefined in source files that make use of C++
  28 // standard libraries, in particular where C++STL headers with inline functions
  29 // are used. The redefinition in such cases would lead to ODR violations.
  30 //
  31 // Try to break the build in common cases where builtins shouldn't be redefined.
  32 namespace std {
  33 class Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file {
  34   Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file(
  35       const Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file&) = delete;
  36   Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file& operator=(
  37       const Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file&) = delete;
  38 };
  39 using array = Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file;
  40 using atomic = Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file;
  41 using function = Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file;
  42 using map = Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file;
  43 using set = Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file;
  44 using shared_ptr = Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file;
  45 using string = Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file;
  46 using unique_ptr = Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file;
  47 using unordered_map = Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file;
  48 using unordered_set = Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file;
  49 using vector = Define_SANITIZER_COMMON_NO_REDEFINE_BUILTINS_in_cpp_file;
  50 }  // namespace std
  51
  52 #      endif  // __cpluplus
  53 #    endif    // !_WIN32 && HAVE_AS_SYM_ASSIGN
  54
  55 #  endif  // SANITIZER_REDEFINE_BUILTINS_H
  56 #endif    // SANITIZER_COMMON_NO_REDEFINE_BUILTINS