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      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 #include <stdlib.h>
     22 
     23 namespace __ubsan {
     24 
     25 const char *MaybeCallUbsanDefaultOptions() {
     26   return (&__ubsan_default_options) ? __ubsan_default_options() : "";
     27 }
     28 
     29 static const char *GetFlag(const char *flag) {
     30   // We cannot call getenv() from inside a preinit array initializer
     31   if (SANITIZER_CAN_USE_PREINIT_ARRAY) {
     32     return GetEnv(flag);
     33   } else {
     34     return getenv(flag);
     35   }
     36 }
     37 
     38 Flags ubsan_flags;
     39 
     40 void Flags::SetDefaults() {
     41 #define UBSAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
     42 #include "ubsan_flags.inc"
     43 #undef UBSAN_FLAG
     44 }
     45 
     46 void RegisterUbsanFlags(FlagParser *parser, Flags *f) {
     47 #define UBSAN_FLAG(Type, Name, DefaultValue, Description) \
     48   RegisterFlag(parser, #Name, Description, &f->Name);
     49 #include "ubsan_flags.inc"
     50 #undef UBSAN_FLAG
     51 }
     52 
     53 void InitializeFlags() {
     54   SetCommonFlagsDefaults();
     55   {
     56     CommonFlags cf;
     57     cf.CopyFrom(*common_flags());
     58     cf.print_summary = false;
     59     cf.external_symbolizer_path = GetFlag("UBSAN_SYMBOLIZER_PATH");
     60     OverrideCommonFlags(cf);
     61   }
     62 
     63   Flags *f = flags();
     64   f->SetDefaults();
     65 
     66   FlagParser parser;
     67   RegisterCommonFlags(&parser);
     68   RegisterUbsanFlags(&parser, f);
     69 
     70   // Override from user-specified string.
     71   parser.ParseString(MaybeCallUbsanDefaultOptions());
     72   // Override from environment variable.
     73   parser.ParseString(GetFlag("UBSAN_OPTIONS"));
     74   InitializeCommonFlags();
     75   if (Verbosity()) ReportUnrecognizedFlags();
     76 
     77   if (common_flags()->help) parser.PrintFlagDescriptions();
     78 }
     79 
     80 }  // namespace __ubsan
     81 
     82 SANITIZER_INTERFACE_WEAK_DEF(const char *, __ubsan_default_options, void) {
     83   return "";
     84 }
     85 
     86 #endif  // CAN_SANITIZE_UB
     87