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