1//===-- tsan_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// This file is a part of ThreadSanitizer (TSan), a race detector. 10// 11//===----------------------------------------------------------------------===// 12 13#include "tsan_flags.h" 14 15#include "sanitizer_common/sanitizer_flag_parser.h" 16#include "sanitizer_common/sanitizer_flags.h" 17#include "sanitizer_common/sanitizer_libc.h" 18#include "tsan_interface.h" 19#include "tsan_mman.h" 20#include "tsan_rtl.h" 21#include "ubsan/ubsan_flags.h" 22 23namespace __tsan { 24 25// Can be overriden in frontend. 26#ifdef TSAN_EXTERNAL_HOOKS 27extern "C" const char *__tsan_default_options(); 28#else 29SANITIZER_WEAK_DEFAULT_IMPL 30const char *__tsan_default_options() { 31 return ""; 32} 33#endif 34 35void Flags::SetDefaults() { 36#define TSAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue; 37#include "tsan_flags.inc" 38#undef TSAN_FLAG 39 // DDFlags 40 second_deadlock_stack = false; 41} 42 43void RegisterTsanFlags(FlagParser *parser, Flags *f) { 44#define TSAN_FLAG(Type, Name, DefaultValue, Description) \ 45 RegisterFlag(parser, #Name, Description, &f->Name); 46#include "tsan_flags.inc" 47#undef TSAN_FLAG 48 // DDFlags 49 RegisterFlag(parser, "second_deadlock_stack", 50 "Report where each mutex is locked in deadlock reports", 51 &f->second_deadlock_stack); 52} 53 54void InitializeFlags(Flags *f, const char *env, const char *env_option_name) { 55 SetCommonFlagsDefaults(); 56 { 57 // Override some common flags defaults. 58 CommonFlags cf; 59 cf.CopyFrom(*common_flags()); 60 cf.external_symbolizer_path = GetEnv("TSAN_SYMBOLIZER_PATH"); 61 cf.allow_addr2line = true; 62 if (SANITIZER_GO) { 63 // Does not work as expected for Go: runtime handles SIGABRT and crashes. 64 cf.abort_on_error = false; 65 // Go does not have mutexes. 66 cf.detect_deadlocks = false; 67 } 68 cf.print_suppressions = false; 69 cf.stack_trace_format = " #%n %f %S %M"; 70 cf.exitcode = 66; 71 cf.intercept_tls_get_addr = true; 72 OverrideCommonFlags(cf); 73 } 74 75 f->SetDefaults(); 76 77 FlagParser parser; 78 RegisterTsanFlags(&parser, f); 79 RegisterCommonFlags(&parser); 80 81#if TSAN_CONTAINS_UBSAN 82 __ubsan::Flags *uf = __ubsan::flags(); 83 uf->SetDefaults(); 84 85 FlagParser ubsan_parser; 86 __ubsan::RegisterUbsanFlags(&ubsan_parser, uf); 87 RegisterCommonFlags(&ubsan_parser); 88#endif 89 90 // Let a frontend override. 91 parser.ParseString(__tsan_default_options()); 92#if TSAN_CONTAINS_UBSAN 93 const char *ubsan_default_options = __ubsan_default_options(); 94 ubsan_parser.ParseString(ubsan_default_options); 95#endif 96 // Override from command line. 97 parser.ParseString(env, env_option_name); 98#if TSAN_CONTAINS_UBSAN 99 ubsan_parser.ParseStringFromEnv("UBSAN_OPTIONS"); 100#endif 101 102 // Check flags. 103 if (!f->report_bugs) { 104 f->report_thread_leaks = false; 105 f->report_destroy_locked = false; 106 f->report_signal_unsafe = false; 107 } 108 109 InitializeCommonFlags(); 110 111 if (Verbosity()) ReportUnrecognizedFlags(); 112 113 if (common_flags()->help) parser.PrintFlagDescriptions(); 114 115 if (f->io_sync < 0 || f->io_sync > 2) { 116 Printf("ThreadSanitizer: incorrect value for io_sync" 117 " (must be [0..2])\n"); 118 Die(); 119 } 120} 121 122} // namespace __tsan 123