compiler-rt/lib/nsan/nsan_flags.cpp

   1 //===-- nsan_flags.cc -----------------------------------------------------===//
   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 // This file is a part of NumericalStabilitySanitizer.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "nsan_flags.h"
  14
  15 #include "sanitizer_common/sanitizer_flag_parser.h"
  16 #include "sanitizer_common/sanitizer_flags.h"
  17
  18 using namespace __sanitizer;
  19 using namespace __nsan;
  20
  21 SANITIZER_INTERFACE_WEAK_DEF(const char *, __nsan_default_options, void) {
  22   return "";
  23 }
  24
  25 Flags __nsan::flags_data;
  26
  27 void Flags::SetDefaults() {
  28 #define NSAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
  29 #include "nsan_flags.inc"
  30 #undef NSAN_FLAG
  31 }
  32
  33 void Flags::PopulateCache() {
  34   cached_absolute_error_threshold =
  35       1.0 / (1ull << log2_absolute_error_threshold);
  36 }
  37
  38 static void RegisterNSanFlags(FlagParser *parser, Flags *f) {
  39 #define NSAN_FLAG(Type, Name, DefaultValue, Description)                       \
  40   RegisterFlag(parser, #Name, Description, &f->Name);
  41 #include "nsan_flags.inc"
  42 #undef NSAN_FLAG
  43 }
  44
  45 static const char *MaybeCallNsanDefaultOptions() {
  46   return (&__nsan_default_options) ? __nsan_default_options() : "";
  47 }
  48
  49 void __nsan::InitializeFlags() {
  50   SetCommonFlagsDefaults();
  51   {
  52     CommonFlags cf;
  53     cf.CopyFrom(*common_flags());
  54     cf.external_symbolizer_path = GetEnv("NSAN_SYMBOLIZER_PATH");
  55     OverrideCommonFlags(cf);
  56   }
  57
  58   flags().SetDefaults();
  59
  60   FlagParser parser;
  61   RegisterCommonFlags(&parser);
  62   RegisterNSanFlags(&parser, &flags());
  63
  64   const char *nsan_default_options = MaybeCallNsanDefaultOptions();
  65   parser.ParseString(nsan_default_options);
  66
  67   parser.ParseString(GetEnv("NSAN_OPTIONS"));
  68   InitializeCommonFlags();
  69   if (Verbosity())
  70     ReportUnrecognizedFlags();
  71   if (common_flags()->help)
  72     parser.PrintFlagDescriptions();
  73
  74   flags().PopulateCache();
  75 }