| 1 | //===-- ubsan_flags.cpp ---------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // Runtime flags for UndefinedBehaviorSanitizer. |
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| 10 | // |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |
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| 13 | #include "ubsan_platform.h" |
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| 14 | #if CAN_SANITIZE_UB |
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| 15 | #include "ubsan_flags.h" |
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| 16 | #include "sanitizer_common/sanitizer_common.h" |
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| 17 | #include "sanitizer_common/sanitizer_flags.h" |
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| 18 | #include "sanitizer_common/sanitizer_flag_parser.h" |
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| 19 | |
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| 20 | #include <stdlib.h> |
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| 21 | |
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| 22 | namespace __ubsan { |
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| 23 | |
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| 24 | static const char *GetFlag(const char *flag) { |
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| 25 | // We cannot call getenv() from inside a preinit array initializer |
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| 26 | if (SANITIZER_CAN_USE_PREINIT_ARRAY) { |
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| 27 | return GetEnv(name: flag); |
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| 28 | } else { |
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| 29 | return getenv(name: flag); |
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| 30 | } |
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| 31 | } |
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| 32 | |
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| 33 | Flags ubsan_flags; |
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| 34 | |
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| 35 | void Flags::SetDefaults() { |
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| 36 | #define UBSAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue; |
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| 37 | #include "ubsan_flags.inc" |
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| 38 | #undef UBSAN_FLAG |
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| 39 | } |
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| 40 | |
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| 41 | void RegisterUbsanFlags(FlagParser *parser, Flags *f) { |
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| 42 | #define UBSAN_FLAG(Type, Name, DefaultValue, Description) \ |
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| 43 | RegisterFlag(parser, #Name, Description, &f->Name); |
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| 44 | #include "ubsan_flags.inc" |
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| 45 | #undef UBSAN_FLAG |
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| 46 | } |
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| 47 | |
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| 48 | void InitializeFlags() { |
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| 49 | SetCommonFlagsDefaults(); |
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| 50 | { |
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| 51 | CommonFlags cf; |
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| 52 | cf.CopyFrom(other: *common_flags()); |
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| 53 | cf.external_symbolizer_path = GetFlag(flag: "UBSAN_SYMBOLIZER_PATH" ); |
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| 54 | OverrideCommonFlags(cf); |
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| 55 | } |
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| 56 | |
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| 57 | Flags *f = flags(); |
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| 58 | f->SetDefaults(); |
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| 59 | |
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| 60 | FlagParser parser; |
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| 61 | RegisterCommonFlags(parser: &parser); |
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| 62 | RegisterUbsanFlags(parser: &parser, f); |
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| 63 | |
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| 64 | // Override from user-specified string. |
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| 65 | parser.ParseString(s: __ubsan_default_options()); |
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| 66 | // Override from environment variable. |
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| 67 | parser.ParseStringFromEnv(env_name: "UBSAN_OPTIONS" ); |
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| 68 | InitializeCommonFlags(); |
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| 69 | if (Verbosity()) ReportUnrecognizedFlags(); |
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| 70 | |
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| 71 | if (common_flags()->help) parser.PrintFlagDescriptions(); |
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| 72 | } |
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| 73 | |
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| 74 | } // namespace __ubsan |
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| 75 | |
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| 76 | SANITIZER_INTERFACE_WEAK_DEF(const char *, __ubsan_default_options, void) { |
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| 77 | return "" ; |
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| 78 | } |
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| 79 | |
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| 80 | #endif // CAN_SANITIZE_UB |
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| 81 | |
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