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      1 //===-- tsan_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 // This file is a part of ThreadSanitizer (TSan), a race detector.
     11 //
     12 //===----------------------------------------------------------------------===//
     13 
     14 #include "sanitizer_common/sanitizer_flags.h"
     15 #include "sanitizer_common/sanitizer_flag_parser.h"
     16 #include "sanitizer_common/sanitizer_libc.h"
     17 #include "tsan_flags.h"
     18 #include "tsan_rtl.h"
     19 #include "tsan_mman.h"
     20 #include "ubsan/ubsan_flags.h"
     21 
     22 namespace __tsan {
     23 
     24 // Can be overriden in frontend.
     25 #ifdef TSAN_EXTERNAL_HOOKS
     26 extern "C" const char* __tsan_default_options();
     27 #else
     28 SANITIZER_WEAK_DEFAULT_IMPL
     29 const char *__tsan_default_options() {
     30   return "";
     31 }
     32 #endif
     33 
     34 void Flags::SetDefaults() {
     35 #define TSAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
     36 #include "tsan_flags.inc"
     37 #undef TSAN_FLAG
     38   // DDFlags
     39   second_deadlock_stack = false;
     40 }
     41 
     42 void RegisterTsanFlags(FlagParser *parser, Flags *f) {
     43 #define TSAN_FLAG(Type, Name, DefaultValue, Description) \
     44   RegisterFlag(parser, #Name, Description, &f->Name);
     45 #include "tsan_flags.inc"
     46 #undef TSAN_FLAG
     47   // DDFlags
     48   RegisterFlag(parser, "second_deadlock_stack",
     49       "Report where each mutex is locked in deadlock reports",
     50       &f->second_deadlock_stack);
     51 }
     52 
     53 void InitializeFlags(Flags *f, const char *env) {
     54   SetCommonFlagsDefaults();
     55   {
     56     // Override some common flags defaults.
     57     CommonFlags cf;
     58     cf.CopyFrom(*common_flags());
     59     cf.allow_addr2line = true;
     60     if (SANITIZER_GO) {
     61       // Does not work as expected for Go: runtime handles SIGABRT and crashes.
     62       cf.abort_on_error = false;
     63       // Go does not have mutexes.
     64       cf.detect_deadlocks = false;
     65     }
     66     cf.print_suppressions = false;
     67     cf.stack_trace_format = "    #%n %f %S %M";
     68     cf.exitcode = 66;
     69     cf.intercept_tls_get_addr = true;
     70     OverrideCommonFlags(cf);
     71   }
     72 
     73   f->SetDefaults();
     74 
     75   FlagParser parser;
     76   RegisterTsanFlags(&parser, f);
     77   RegisterCommonFlags(&parser);
     78 
     79 #if TSAN_CONTAINS_UBSAN
     80   __ubsan::Flags *uf = __ubsan::flags();
     81   uf->SetDefaults();
     82 
     83   FlagParser ubsan_parser;
     84   __ubsan::RegisterUbsanFlags(&ubsan_parser, uf);
     85   RegisterCommonFlags(&ubsan_parser);
     86 #endif
     87 
     88   // Let a frontend override.
     89   parser.ParseString(__tsan_default_options());
     90 #if TSAN_CONTAINS_UBSAN
     91   const char *ubsan_default_options = __ubsan::MaybeCallUbsanDefaultOptions();
     92   ubsan_parser.ParseString(ubsan_default_options);
     93 #endif
     94   // Override from command line.
     95   parser.ParseString(env);
     96 #if TSAN_CONTAINS_UBSAN
     97   ubsan_parser.ParseString(GetEnv("UBSAN_OPTIONS"));
     98 #endif
     99 
    100   // Sanity check.
    101   if (!f->report_bugs) {
    102     f->report_thread_leaks = false;
    103     f->report_destroy_locked = false;
    104     f->report_signal_unsafe = false;
    105   }
    106 
    107   InitializeCommonFlags();
    108 
    109   if (Verbosity()) ReportUnrecognizedFlags();
    110 
    111   if (common_flags()->help) parser.PrintFlagDescriptions();
    112 
    113   if (f->history_size < 0 || f->history_size > 7) {
    114     Printf("ThreadSanitizer: incorrect value for history_size"
    115            " (must be [0..7])\n");
    116     Die();
    117   }
    118 
    119   if (f->io_sync < 0 || f->io_sync > 2) {
    120     Printf("ThreadSanitizer: incorrect value for io_sync"
    121            " (must be [0..2])\n");
    122     Die();
    123   }
    124 }
    125 
    126 }  // namespace __tsan
    127