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 const char *MaybeCallUbsanDefaultOptions() { 25 return (&__ubsan_default_options) ? __ubsan_default_options() : ""; 26 } 27 28 static const char *GetFlag(const char *flag) { 29 // We cannot call getenv() from inside a preinit array initializer 30 if (SANITIZER_CAN_USE_PREINIT_ARRAY) { 31 return GetEnv(flag); 32 } else { 33 return getenv(flag); 34 } 35 } 36 37 Flags ubsan_flags; 38 39 void Flags::SetDefaults() { 40 #define UBSAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue; 41 #include "ubsan_flags.inc" 42 #undef UBSAN_FLAG 43 } 44 45 void RegisterUbsanFlags(FlagParser *parser, Flags *f) { 46 #define UBSAN_FLAG(Type, Name, DefaultValue, Description) \ 47 RegisterFlag(parser, #Name, Description, &f->Name); 48 #include "ubsan_flags.inc" 49 #undef UBSAN_FLAG 50 } 51 52 void InitializeFlags() { 53 SetCommonFlagsDefaults(); 54 { 55 CommonFlags cf; 56 cf.CopyFrom(*common_flags()); 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.ParseStringFromEnv("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 85