libsanitizer/ubsan/ubsan_flags.cc

   1 //===-- ubsan_flags.cc ----------------------------------------------------===//
   2 //
   3 // This file is distributed under the University of Illinois Open Source
   4 // License. See LICENSE.TXT for details.
   5 //
   6 //===----------------------------------------------------------------------===//
   7 //
   8 // Runtime flags for UndefinedBehaviorSanitizer.
   9 //
  10 //===----------------------------------------------------------------------===//
  11
  12 #include "ubsan_platform.h"
  13 #if CAN_SANITIZE_UB
  14 #include "ubsan_flags.h"
  15 #include "sanitizer_common/sanitizer_common.h"
  16 #include "sanitizer_common/sanitizer_flags.h"
  17 #include "sanitizer_common/sanitizer_flag_parser.h"
  18
  19 #include <stdlib.h>
  20
  21 namespace __ubsan {
  22
  23 const char *MaybeCallUbsanDefaultOptions() {
  24   return (&__ubsan_default_options) ? __ubsan_default_options() : "";
  25 }
  26
  27 static const char *GetFlag(const char *flag) {
  28   // We cannot call getenv() from inside a preinit array initializer
  29   if (SANITIZER_CAN_USE_PREINIT_ARRAY) {
  30     return GetEnv(flag);
  31   } else {
  32     return getenv(flag);
  33   }
  34 }
  35
  36 Flags ubsan_flags;
  37
  38 void Flags::SetDefaults() {
  39 #define UBSAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
  40 #include "ubsan_flags.inc"
  41 #undef UBSAN_FLAG
  42 }
  43
  44 void RegisterUbsanFlags(FlagParser *parser, Flags *f) {
  45 #define UBSAN_FLAG(Type, Name, DefaultValue, Description) \
  46   RegisterFlag(parser, #Name, Description, &f->Name);
  47 #include "ubsan_flags.inc"
  48 #undef UBSAN_FLAG
  49 }
  50
  51 void InitializeFlags() {
  52   SetCommonFlagsDefaults();
  53   {
  54     CommonFlags cf;
  55     cf.CopyFrom(*common_flags());
  56     cf.print_summary = false;
  57     cf.external_symbolizer_path = GetFlag("UBSAN_SYMBOLIZER_PATH");
  58     OverrideCommonFlags(cf);
  59   }
  60
  61   Flags *f = flags();
  62   f->SetDefaults();
  63
  64   FlagParser parser;
  65   RegisterCommonFlags(&parser);
  66   RegisterUbsanFlags(&parser, f);
  67
  68   // Override from user-specified string.
  69   parser.ParseString(MaybeCallUbsanDefaultOptions());
  70   // Override from environment variable.
  71   parser.ParseString(GetFlag("UBSAN_OPTIONS"));
  72   InitializeCommonFlags();
  73   if (Verbosity()) ReportUnrecognizedFlags();
  74
  75   if (common_flags()->help) parser.PrintFlagDescriptions();
  76 }
  77
  78 }  // namespace __ubsan
  79
  80 SANITIZER_INTERFACE_WEAK_DEF(const char *, __ubsan_default_options, void) {
  81   return "";
  82 }
  83
  84 #endif  // CAN_SANITIZE_UB