src/libcompiler_builtins/compiler-rt/lib/ubsan/ubsan_flags.cc

   1 //===-- ubsan_flags.cc ----------------------------------------------------===//
   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 // Runtime flags for UndefinedBehaviorSanitizer.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "ubsan_platform.h"
  15 #if CAN_SANITIZE_UB
  16 #include "ubsan_flags.h"
  17 #include "sanitizer_common/sanitizer_common.h"
  18 #include "sanitizer_common/sanitizer_flags.h"
  19 #include "sanitizer_common/sanitizer_flag_parser.h"
  20
  21 namespace __ubsan {
  22
  23 const char *MaybeCallUbsanDefaultOptions() {
  24   return (&__ubsan_default_options) ? __ubsan_default_options() : "";
  25 }
  26
  27 Flags ubsan_flags;
  28
  29 void Flags::SetDefaults() {
  30 #define UBSAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
  31 #include "ubsan_flags.inc"
  32 #undef UBSAN_FLAG
  33 }
  34
  35 void RegisterUbsanFlags(FlagParser *parser, Flags *f) {
  36 #define UBSAN_FLAG(Type, Name, DefaultValue, Description) \
  37   RegisterFlag(parser, #Name, Description, &f->Name);
  38 #include "ubsan_flags.inc"
  39 #undef UBSAN_FLAG
  40 }
  41
  42 void InitializeFlags() {
  43   SetCommonFlagsDefaults();
  44   {
  45     CommonFlags cf;
  46     cf.CopyFrom(*common_flags());
  47     cf.print_summary = false;
  48     OverrideCommonFlags(cf);
  49   }
  50
  51   Flags *f = flags();
  52   f->SetDefaults();
  53
  54   FlagParser parser;
  55   RegisterCommonFlags(&parser);
  56   RegisterUbsanFlags(&parser, f);
  57
  58   // Override from user-specified string.
  59   parser.ParseString(MaybeCallUbsanDefaultOptions());
  60   // Override from environment variable.
  61   parser.ParseString(GetEnv("UBSAN_OPTIONS"));
  62   InitializeCommonFlags();
  63   if (Verbosity()) ReportUnrecognizedFlags();
  64
  65   if (common_flags()->help) parser.PrintFlagDescriptions();
  66 }
  67
  68 }  // namespace __ubsan
  69
  70 extern "C" {
  71
  72 #if !SANITIZER_SUPPORTS_WEAK_HOOKS
  73 SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
  74 const char *__ubsan_default_options() { return ""; }
  75 #endif
  76
  77 #if SANITIZER_WINDOWS
  78 const char *__ubsan_default_default_options() { return ""; }
  79 # ifdef _WIN64
  80 #  pragma comment(linker, "/alternatename:__ubsan_default_options=__ubsan_default_default_options")
  81 # else
  82 #  pragma comment(linker, "/alternatename:___ubsan_default_options=___ubsan_default_default_options")
  83 # endif
  84 #endif
  85
  86 }  // extern "C"
  87
  88 #endif  // CAN_SANITIZE_UB