libsanitizer/ubsan/ubsan_flags.cpp

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