1 //===-- ubsan_flags.cc ----------------------------------------------------===//
2 //
3 // This file is distributed under the University of Illinois Open Source
4 // License. See LICENSE.TXT for details.
5 //
6 //===----------------------------------------------------------------------===//
7 //
8 // Runtime flags for UndefinedBehaviorSanitizer.
9 //
10 //===----------------------------------------------------------------------===//
11
12 #include "ubsan_platform.h"
13 #if CAN_SANITIZE_UB
14 #include "ubsan_flags.h"
15 #include "sanitizer_common/sanitizer_common.h"
16 #include "sanitizer_common/sanitizer_flags.h"
17 #include "sanitizer_common/sanitizer_flag_parser.h"
18
19 #include <stdlib.h>
20
21 namespace __ubsan {
22
MaybeCallUbsanDefaultOptions()23 const char *MaybeCallUbsanDefaultOptions() {
24 return (&__ubsan_default_options) ? __ubsan_default_options() : "";
25 }
26
GetFlag(const char * flag)27 static const char *GetFlag(const char *flag) {
28 // We cannot call getenv() from inside a preinit array initializer
29 if (SANITIZER_CAN_USE_PREINIT_ARRAY) {
30 return GetEnv(flag);
31 } else {
32 return getenv(flag);
33 }
34 }
35
36 Flags ubsan_flags;
37
SetDefaults()38 void Flags::SetDefaults() {
39 #define UBSAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
40 #include "ubsan_flags.inc"
41 #undef UBSAN_FLAG
42 }
43
RegisterUbsanFlags(FlagParser * parser,Flags * f)44 void RegisterUbsanFlags(FlagParser *parser, Flags *f) {
45 #define UBSAN_FLAG(Type, Name, DefaultValue, Description) \
46 RegisterFlag(parser, #Name, Description, &f->Name);
47 #include "ubsan_flags.inc"
48 #undef UBSAN_FLAG
49 }
50
InitializeFlags()51 void InitializeFlags() {
52 SetCommonFlagsDefaults();
53 {
54 CommonFlags cf;
55 cf.CopyFrom(*common_flags());
56 cf.print_summary = false;
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.ParseString(GetFlag("UBSAN_OPTIONS"));
72 InitializeCommonFlags();
73 if (Verbosity()) ReportUnrecognizedFlags();
74
75 if (common_flags()->help) parser.PrintFlagDescriptions();
76 }
77
78 } // namespace __ubsan
79
SANITIZER_INTERFACE_WEAK_DEF(const char *,__ubsan_default_options,void)80 SANITIZER_INTERFACE_WEAK_DEF(const char *, __ubsan_default_options, void) {
81 return "";
82 }
83
84 #endif // CAN_SANITIZE_UB
85