1 //===-- options_parser.cpp --------------------------------------*- C++ -*-===//
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 #include "gwp_asan/optional/options_parser.h"
10 
11 #include <stdarg.h>
12 #include <stdint.h>
13 #include <stdlib.h>
14 #include <string.h>
15 
16 #include "gwp_asan/options.h"
17 #include "sanitizer_common/sanitizer_common.h"
18 #include "sanitizer_common/sanitizer_flag_parser.h"
19 #include "sanitizer_common/sanitizer_flags.h"
20 
21 namespace gwp_asan {
22 namespace options {
23 namespace {
24 void registerGwpAsanFlags(__sanitizer::FlagParser *parser, Options *o) {
25 #define GWP_ASAN_OPTION(Type, Name, DefaultValue, Description)                 \
26   RegisterFlag(parser, #Name, Description, &o->Name);
27 #include "gwp_asan/options.inc"
28 #undef GWP_ASAN_OPTION
29 }
30 
31 const char *getCompileDefinitionGwpAsanDefaultOptions() {
32 #ifdef GWP_ASAN_DEFAULT_OPTIONS
33   return SANITIZER_STRINGIFY(GWP_ASAN_DEFAULT_OPTIONS);
34 #else
35   return "";
36 #endif
37 }
38 
39 const char *getGwpAsanDefaultOptions() {
40   return (__gwp_asan_default_options) ? __gwp_asan_default_options() : "";
41 }
42 
43 Options *getOptionsInternal() {
44   static Options GwpAsanFlags;
45   return &GwpAsanFlags;
46 }
47 } // anonymous namespace
48 
49 void initOptions() {
50   __sanitizer::SetCommonFlagsDefaults();
51 
52   Options *o = getOptionsInternal();
53   o->setDefaults();
54 
55   __sanitizer::FlagParser Parser;
56   registerGwpAsanFlags(&Parser, o);
57 
58   // Override from compile definition.
59   Parser.ParseString(getCompileDefinitionGwpAsanDefaultOptions());
60 
61   // Override from user-specified string.
62   Parser.ParseString(getGwpAsanDefaultOptions());
63 
64   // Override from environment.
65   Parser.ParseString(__sanitizer::GetEnv("GWP_ASAN_OPTIONS"));
66 
67   __sanitizer::InitializeCommonFlags();
68   if (__sanitizer::Verbosity())
69     __sanitizer::ReportUnrecognizedFlags();
70 
71   if (!o->Enabled)
72     return;
73 
74   // Sanity checks for the parameters.
75   if (o->MaxSimultaneousAllocations <= 0) {
76     __sanitizer::Printf("GWP-ASan ERROR: MaxSimultaneousAllocations must be > "
77                         "0 when GWP-ASan is enabled.\n");
78     exit(EXIT_FAILURE);
79   }
80 
81   if (o->SampleRate < 1) {
82     __sanitizer::Printf(
83         "GWP-ASan ERROR: SampleRate must be > 0 when GWP-ASan is enabled.\n");
84     exit(EXIT_FAILURE);
85   }
86 
87   o->Printf = __sanitizer::Printf;
88 }
89 
90 Options &getOptions() { return *getOptionsInternal(); }
91 
92 } // namespace options
93 } // namespace gwp_asan
94