llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_flags.cc

//===-- sanitizer_flags.cc ------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of ThreadSanitizer/AddressSanitizer runtime.
//
//===----------------------------------------------------------------------===//

#include "sanitizer_flags.h"

#include "sanitizer_common.h"
#include "sanitizer_libc.h"
#include "sanitizer_list.h"
#include "sanitizer_flag_parser.h"

namespace __sanitizer {

CommonFlags common_flags_dont_use;

struct FlagDescription {
  const char *name;
  const char *description;
  FlagDescription *next;
};

IntrusiveList<FlagDescription> flag_descriptions;

// If set, the tool will install its own SEGV signal handler by default.
#ifndef SANITIZER_NEEDS_SEGV
# define SANITIZER_NEEDS_SEGV 1
#endif

void CommonFlags::SetDefaults() {
#define COMMON_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
#include "sanitizer_flags.inc"
#undef COMMON_FLAG
}

void CommonFlags::CopyFrom(const CommonFlags &other) {
  internal_memcpy(this, &other, sizeof(*this));
}

// Copy the string from "s" to "out", replacing "%b" with the binary basename.
static void SubstituteBinaryName(const char *s, char *out, uptr out_size) {
  char *out_end = out + out_size;
  while (*s && out < out_end - 1) {
    if (s[0] != '%' || s[1] != 'b') { *out++ = *s++; continue; }
    const char *base = GetProcessName();
    CHECK(base);
    while (*base && out < out_end - 1)
      *out++ = *base++;
    s += 2; // skip "%b"
  }
  *out = '\0';
}

class FlagHandlerInclude : public FlagHandlerBase {
  FlagParser *parser_;
  bool ignore_missing_;

 public:
  explicit FlagHandlerInclude(FlagParser *parser, bool ignore_missing)
      : parser_(parser), ignore_missing_(ignore_missing) {}
  bool Parse(const char *value) final {
    if (internal_strchr(value, '%')) {
      char *buf = (char *)MmapOrDie(kMaxPathLength, "FlagHandlerInclude");
      SubstituteBinaryName(value, buf, kMaxPathLength);
      bool res = parser_->ParseFile(buf, ignore_missing_);
      UnmapOrDie(buf, kMaxPathLength);
      return res;
    }
    return parser_->ParseFile(value, ignore_missing_);
  }
};

void RegisterIncludeFlags(FlagParser *parser, CommonFlags *cf) {
  FlagHandlerInclude *fh_include = new (FlagParser::Alloc) // NOLINT
      FlagHandlerInclude(parser, /*ignore_missing*/ false);
  parser->RegisterHandler("include", fh_include,
                          "read more options from the given file");
  FlagHandlerInclude *fh_include_if_exists = new (FlagParser::Alloc) // NOLINT
      FlagHandlerInclude(parser, /*ignore_missing*/ true);
  parser->RegisterHandler(
      "include_if_exists", fh_include_if_exists,
      "read more options from the given file (if it exists)");
}

void RegisterCommonFlags(FlagParser *parser, CommonFlags *cf) {
#define COMMON_FLAG(Type, Name, DefaultValue, Description) \
  RegisterFlag(parser, #Name, Description, &cf->Name);
#include "sanitizer_flags.inc"
#undef COMMON_FLAG

  RegisterIncludeFlags(parser, cf);
}

}  // namespace __sanitizer