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📁 ..
📄 sancov_flags.cpp(1.64 KB)
📄 sancov_flags.h(1.08 KB)
📄 sancov_flags.inc(777 B)
📄 sanitizer_addrhashmap.h(9.19 KB)
📄 sanitizer_allocator.cpp(8.73 KB)
📄 sanitizer_allocator.h(2.69 KB)
📄 sanitizer_allocator_bytemap.h(3.12 KB)
📄 sanitizer_allocator_checks.cpp(686 B)
📄 sanitizer_allocator_checks.h(2.67 KB)
📄 sanitizer_allocator_combined.h(6.29 KB)
📄 sanitizer_allocator_interface.h(1.83 KB)
📄 sanitizer_allocator_internal.h(2.03 KB)
📄 sanitizer_allocator_local_cache.h(8.95 KB)
📄 sanitizer_allocator_primary32.h(12.64 KB)
📄 sanitizer_allocator_primary64.h(32.71 KB)
📄 sanitizer_allocator_report.cpp(4.68 KB)
📄 sanitizer_allocator_report.h(1.72 KB)
📄 sanitizer_allocator_secondary.h(10.78 KB)
📄 sanitizer_allocator_size_class_map.h(10.12 KB)
📄 sanitizer_allocator_stats.h(2.76 KB)
📄 sanitizer_asm.h(2.57 KB)
📄 sanitizer_atomic.h(1.97 KB)
📄 sanitizer_atomic_clang.h(3.42 KB)
📄 sanitizer_atomic_clang_mips.h(3.77 KB)
📄 sanitizer_atomic_clang_other.h(3.02 KB)
📄 sanitizer_atomic_clang_x86.h(3.77 KB)
📄 sanitizer_atomic_msvc.h(8.53 KB)
📄 sanitizer_bitvector.h(9.43 KB)
📄 sanitizer_bvgraph.h(4.62 KB)
📄 sanitizer_common.cpp(10.13 KB)
📄 sanitizer_common.h(30.64 KB)
📄 sanitizer_common_interceptors.inc(348.66 KB)
📄 sanitizer_common_interceptors_format.inc(16.84 KB)
📄 sanitizer_common_interceptors_ioctl.inc(22.13 KB)
📄 sanitizer_common_interceptors_netbsd_compat.inc(4.07 KB)
📄 sanitizer_common_interceptors_vfork_aarch64.inc.S(1.23 KB)
📄 sanitizer_common_interceptors_vfork_arm.inc.S(1.24 KB)
📄 sanitizer_common_interceptors_vfork_i386.inc.S(1.66 KB)
📄 sanitizer_common_interceptors_vfork_x86_64.inc.S(1.03 KB)
📄 sanitizer_common_interface.inc(2.05 KB)
📄 sanitizer_common_interface_posix.inc(732 B)
📄 sanitizer_common_libcdep.cpp(5.4 KB)
📄 sanitizer_common_nolibc.cpp(1.12 KB)
📄 sanitizer_common_syscalls.inc(85 KB)
📄 sanitizer_coverage_fuchsia.cpp(10.1 KB)
📄 sanitizer_coverage_interface.inc(1.73 KB)
📄 sanitizer_coverage_libcdep_new.cpp(7.39 KB)
📄 sanitizer_coverage_win_dll_thunk.cpp(1.03 KB)
📄 sanitizer_coverage_win_dynamic_runtime_thunk.cpp(1.16 KB)
📄 sanitizer_coverage_win_sections.cpp(3.36 KB)
📄 sanitizer_coverage_win_weak_interception.cpp(1.17 KB)
📄 sanitizer_dbghelp.h(1.44 KB)
📄 sanitizer_deadlock_detector.h(13.28 KB)
📄 sanitizer_deadlock_detector1.cpp(5.6 KB)
📄 sanitizer_deadlock_detector2.cpp(10.84 KB)
📄 sanitizer_deadlock_detector_interface.h(2.66 KB)
📄 sanitizer_errno.cpp(1.09 KB)
📄 sanitizer_errno.h(1.3 KB)
📄 sanitizer_errno_codes.h(1.1 KB)
📄 sanitizer_file.cpp(6.24 KB)
📄 sanitizer_file.h(3.67 KB)
📄 sanitizer_flag_parser.cpp(5.55 KB)
📄 sanitizer_flag_parser.h(5.71 KB)
📄 sanitizer_flags.cpp(3.95 KB)
📄 sanitizer_flags.h(2.13 KB)
📄 sanitizer_flags.inc(12.73 KB)
📄 sanitizer_freebsd.h(3.31 KB)
📄 sanitizer_fuchsia.cpp(16.58 KB)
📄 sanitizer_fuchsia.h(1.03 KB)
📄 sanitizer_getauxval.h(1.73 KB)
📄 sanitizer_glibc_version.h(748 B)
📄 sanitizer_hash.h(1.04 KB)
📄 sanitizer_interceptors_ioctl_netbsd.inc(68.81 KB)
📄 sanitizer_interface_internal.h(5.28 KB)
📄 sanitizer_internal_defs.h(14.28 KB)
📄 sanitizer_lfstack.h(2.08 KB)
📄 sanitizer_libc.cpp(7.21 KB)
📄 sanitizer_libc.h(3.23 KB)
📄 sanitizer_libignore.cpp(4.24 KB)
📄 sanitizer_libignore.h(3.5 KB)
📄 sanitizer_linux.cpp(71.58 KB)
📄 sanitizer_linux.h(5.47 KB)
📄 sanitizer_linux_libcdep.cpp(25.67 KB)
📄 sanitizer_linux_s390.cpp(6.91 KB)
📄 sanitizer_list.h(3.81 KB)
📄 sanitizer_local_address_space_view.h(3.67 KB)
📄 sanitizer_mac.cpp(38.67 KB)
📄 sanitizer_mac.h(2.49 KB)
📄 sanitizer_mac_libcdep.cpp(968 B)
📄 sanitizer_malloc_mac.inc(13.06 KB)
📄 sanitizer_mutex.h(5.17 KB)
📄 sanitizer_netbsd.cpp(9.95 KB)
📄 sanitizer_openbsd.cpp(3.17 KB)
📄 sanitizer_persistent_allocator.cpp(687 B)
📄 sanitizer_persistent_allocator.h(2.31 KB)
📄 sanitizer_placement_new.h(885 B)
📄 sanitizer_platform.h(10.11 KB)
📄 sanitizer_platform_interceptors.h(24.93 KB)
📄 sanitizer_platform_limits_freebsd.cpp(19.79 KB)
📄 sanitizer_platform_limits_freebsd.h(18.41 KB)
📄 sanitizer_platform_limits_linux.cpp(3.32 KB)
📄 sanitizer_platform_limits_netbsd.cpp(109.73 KB)
📄 sanitizer_platform_limits_netbsd.h(81.54 KB)
📄 sanitizer_platform_limits_openbsd.cpp(8.69 KB)
📄 sanitizer_platform_limits_openbsd.h(8.68 KB)
📄 sanitizer_platform_limits_posix.cpp(48.89 KB)
📄 sanitizer_platform_limits_posix.h(40.65 KB)
📄 sanitizer_platform_limits_solaris.cpp(11.93 KB)
📄 sanitizer_platform_limits_solaris.h(12.26 KB)
📄 sanitizer_posix.cpp(11.93 KB)
📄 sanitizer_posix.h(5.14 KB)
📄 sanitizer_posix_libcdep.cpp(16.21 KB)
📄 sanitizer_printf.cpp(12.07 KB)
📄 sanitizer_procmaps.h(2.93 KB)
📄 sanitizer_procmaps_bsd.cpp(3.81 KB)
📄 sanitizer_procmaps_common.cpp(5.27 KB)
📄 sanitizer_procmaps_fuchsia.cpp(2.51 KB)
📄 sanitizer_procmaps_linux.cpp(2.9 KB)
📄 sanitizer_procmaps_mac.cpp(13.7 KB)
📄 sanitizer_procmaps_solaris.cpp(2.18 KB)
📄 sanitizer_ptrauth.h(720 B)
📄 sanitizer_quarantine.h(9.57 KB)
📄 sanitizer_report_decorator.h(1.89 KB)
📄 sanitizer_ring_buffer.h(4.7 KB)
📄 sanitizer_rtems.cpp(7.61 KB)
📄 sanitizer_rtems.h(772 B)
📄 sanitizer_signal_interceptors.inc(2.89 KB)
📄 sanitizer_solaris.cpp(6.6 KB)
📄 sanitizer_stackdepot.cpp(4.54 KB)
📄 sanitizer_stackdepot.h(2.13 KB)
📄 sanitizer_stackdepotbase.h(5.58 KB)
📄 sanitizer_stacktrace.cpp(4.58 KB)
📄 sanitizer_stacktrace.h(5.65 KB)
📄 sanitizer_stacktrace_libcdep.cpp(5.54 KB)
📄 sanitizer_stacktrace_printer.cpp(9.08 KB)
📄 sanitizer_stacktrace_printer.h(3.08 KB)
📄 sanitizer_stacktrace_sparc.cpp(3.05 KB)
📄 sanitizer_stoptheworld.h(2.34 KB)
📄 sanitizer_stoptheworld_fuchsia.cpp(1.28 KB)
📄 sanitizer_stoptheworld_linux_libcdep.cpp(20.8 KB)
📄 sanitizer_stoptheworld_mac.cpp(5.29 KB)
📄 sanitizer_stoptheworld_netbsd_libcdep.cpp(11.02 KB)
📄 sanitizer_suppressions.cpp(5.67 KB)
📄 sanitizer_suppressions.h(1.69 KB)
📄 sanitizer_symbolizer.cpp(3.65 KB)
📄 sanitizer_symbolizer.h(6.62 KB)
📄 sanitizer_symbolizer_fuchsia.h(1.56 KB)
📄 sanitizer_symbolizer_internal.h(5.8 KB)
📄 sanitizer_symbolizer_libbacktrace.cpp(6.1 KB)
📄 sanitizer_symbolizer_libbacktrace.h(1.49 KB)
📄 sanitizer_symbolizer_libcdep.cpp(17.45 KB)
📄 sanitizer_symbolizer_mac.cpp(8.48 KB)
📄 sanitizer_symbolizer_mac.h(1.37 KB)
📄 sanitizer_symbolizer_markup.cpp(5.39 KB)
📄 sanitizer_symbolizer_posix_libcdep.cpp(16.5 KB)
📄 sanitizer_symbolizer_report.cpp(10.01 KB)
📄 sanitizer_symbolizer_rtems.h(1.56 KB)
📄 sanitizer_symbolizer_win.cpp(11.59 KB)
📄 sanitizer_syscall_generic.inc(1.06 KB)
📄 sanitizer_syscall_linux_aarch64.inc(4.58 KB)
📄 sanitizer_syscall_linux_arm.inc(4.58 KB)
📄 sanitizer_syscall_linux_x86_64.inc(3.07 KB)
📄 sanitizer_syscalls_netbsd.inc(120.97 KB)
📄 sanitizer_termination.cpp(2.86 KB)
📄 sanitizer_thread_registry.cpp(10.31 KB)
📄 sanitizer_thread_registry.h(5.44 KB)
📄 sanitizer_tls_get_addr.cpp(5.29 KB)
📄 sanitizer_tls_get_addr.h(2.21 KB)
📄 sanitizer_type_traits.cpp(708 B)
📄 sanitizer_type_traits.h(1.49 KB)
📄 sanitizer_unwind_linux_libcdep.cpp(6.13 KB)
📄 sanitizer_unwind_win.cpp(2.41 KB)
📄 sanitizer_vector.h(2.57 KB)
📄 sanitizer_win.cpp(33.3 KB)
📄 sanitizer_win.h(851 B)
📄 sanitizer_win_defs.h(7.23 KB)
📄 sanitizer_win_dll_thunk.cpp(3.41 KB)
📄 sanitizer_win_dll_thunk.h(11.13 KB)
📄 sanitizer_win_dynamic_runtime_thunk.cpp(1.16 KB)
📄 sanitizer_win_weak_interception.cpp(3.49 KB)
📄 sanitizer_win_weak_interception.h(1.64 KB)
📁 symbolizer
📄 weak_symbols.txt(230 B)

Editing: sanitizer_symbolizer_posix_libcdep.cpp

//===-- sanitizer_symbolizer_posix_libcdep.cpp ----------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is shared between AddressSanitizer and ThreadSanitizer
// run-time libraries.
// POSIX-specific implementation of symbolizer parts.
//===----------------------------------------------------------------------===//

#include "sanitizer_platform.h"
#if SANITIZER_POSIX
#include "sanitizer_allocator_internal.h"
#include "sanitizer_common.h"
#include "sanitizer_file.h"
#include "sanitizer_flags.h"
#include "sanitizer_internal_defs.h"
#include "sanitizer_linux.h"
#include "sanitizer_placement_new.h"
#include "sanitizer_posix.h"
#include "sanitizer_procmaps.h"
#include "sanitizer_symbolizer_internal.h"
#include "sanitizer_symbolizer_libbacktrace.h"
#include "sanitizer_symbolizer_mac.h"

#include <dlfcn.h>   // for dlsym()
#include <errno.h>
#include <stdint.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <unistd.h>

// C++ demangling function, as required by Itanium C++ ABI. This is weak,
// because we do not require a C++ ABI library to be linked to a program
// using sanitizers; if it's not present, we'll just use the mangled name.
namespace __cxxabiv1 {
  extern "C" SANITIZER_WEAK_ATTRIBUTE
  char *__cxa_demangle(const char *mangled, char *buffer,
                                  size_t *length, int *status);
}

namespace __sanitizer {

// Attempts to demangle the name via __cxa_demangle from __cxxabiv1.
const char *DemangleCXXABI(const char *name) {
  // FIXME: __cxa_demangle aggressively insists on allocating memory.
  // There's not much we can do about that, short of providing our
  // own demangler (libc++abi's implementation could be adapted so that
  // it does not allocate). For now, we just call it anyway, and we leak
  // the returned value.
  if (&__cxxabiv1::__cxa_demangle)
    if (const char *demangled_name =
          __cxxabiv1::__cxa_demangle(name, 0, 0, 0))
      return demangled_name;

return name;
}

// As of now, there are no headers for the Swift runtime. Once they are
// present, we will weakly link since we do not require Swift runtime to be
// linked.
typedef char *(*swift_demangle_ft)(const char *mangledName,
                                   size_t mangledNameLength, char *outputBuffer,
                                   size_t *outputBufferSize, uint32_t flags);
static swift_demangle_ft swift_demangle_f;

// This must not happen lazily at symbolication time, because dlsym uses
// malloc and thread-local storage, which is not a good thing to do during
// symbolication.
static void InitializeSwiftDemangler() {
  swift_demangle_f = (swift_demangle_ft)dlsym(RTLD_DEFAULT, "swift_demangle");
  (void)dlerror(); // Cleanup error message in case of failure
}

// Attempts to demangle a Swift name. The demangler will return nullptr if a
// non-Swift name is passed in.
const char *DemangleSwift(const char *name) {
  if (swift_demangle_f)
    return swift_demangle_f(name, internal_strlen(name), 0, 0, 0);

return nullptr;
}

const char *DemangleSwiftAndCXX(const char *name) {
  if (!name) return nullptr;
  if (const char *swift_demangled_name = DemangleSwift(name))
    return swift_demangled_name;
  return DemangleCXXABI(name);
}

static bool CreateTwoHighNumberedPipes(int *infd_, int *outfd_) {
  int *infd = NULL;
  int *outfd = NULL;
  // The client program may close its stdin and/or stdout and/or stderr
  // thus allowing socketpair to reuse file descriptors 0, 1 or 2.
  // In this case the communication between the forked processes may be
  // broken if either the parent or the child tries to close or duplicate
  // these descriptors. The loop below produces two pairs of file
  // descriptors, each greater than 2 (stderr).
  int sock_pair[5][2];
  for (int i = 0; i < 5; i++) {
    if (pipe(sock_pair[i]) == -1) {
      for (int j = 0; j < i; j++) {
        internal_close(sock_pair[j][0]);
        internal_close(sock_pair[j][1]);
      }
      return false;
    } else if (sock_pair[i][0] > 2 && sock_pair[i][1] > 2) {
      if (infd == NULL) {
        infd = sock_pair[i];
      } else {
        outfd = sock_pair[i];
        for (int j = 0; j < i; j++) {
          if (sock_pair[j] == infd) continue;
          internal_close(sock_pair[j][0]);
          internal_close(sock_pair[j][1]);
        }
        break;
      }
    }
  }
  CHECK(infd);
  CHECK(outfd);
  infd_[0] = infd[0];
  infd_[1] = infd[1];
  outfd_[0] = outfd[0];
  outfd_[1] = outfd[1];
  return true;
}

bool SymbolizerProcess::StartSymbolizerSubprocess() {
  if (!FileExists(path_)) {
    if (!reported_invalid_path_) {
      Report("WARNING: invalid path to external symbolizer!\n");
      reported_invalid_path_ = true;
    }
    return false;
  }

const char *argv[kArgVMax];
  GetArgV(path_, argv);
  pid_t pid;

// Report how symbolizer is being launched for debugging purposes.
  if (Verbosity() >= 3) {
    // Only use `Report` for first line so subsequent prints don't get prefixed
    // with current PID.
    Report("Launching Symbolizer process: ");
    for (unsigned index = 0; index < kArgVMax && argv[index]; ++index)
      Printf("%s ", argv[index]);
    Printf("\n");
  }

if (use_posix_spawn_) {
#if SANITIZER_MAC
    fd_t fd = internal_spawn(argv, const_cast<const char **>(GetEnvP()), &pid);
    if (fd == kInvalidFd) {
      Report("WARNING: failed to spawn external symbolizer (errno: %d)\n",
             errno);
      return false;
    }

input_fd_ = fd;
    output_fd_ = fd;
#else  // SANITIZER_MAC
    UNIMPLEMENTED();
#endif  // SANITIZER_MAC
  } else {
    fd_t infd[2] = {}, outfd[2] = {};
    if (!CreateTwoHighNumberedPipes(infd, outfd)) {
      Report("WARNING: Can't create a socket pair to start "
             "external symbolizer (errno: %d)\n", errno);
      return false;
    }

pid = StartSubprocess(path_, argv, GetEnvP(), /* stdin */ outfd[0],
                          /* stdout */ infd[1]);
    if (pid < 0) {
      internal_close(infd[0]);
      internal_close(outfd[1]);
      return false;
    }

input_fd_ = infd[0];
    output_fd_ = outfd[1];
  }

CHECK_GT(pid, 0);

// Check that symbolizer subprocess started successfully.
  SleepForMillis(kSymbolizerStartupTimeMillis);
  if (!IsProcessRunning(pid)) {
    // Either waitpid failed, or child has already exited.
    Report("WARNING: external symbolizer didn't start up correctly!\n");
    return false;
  }

return true;
}

class Addr2LineProcess : public SymbolizerProcess {
 public:
  Addr2LineProcess(const char *path, const char *module_name)
      : SymbolizerProcess(path), module_name_(internal_strdup(module_name)) {}

const char *module_name() const { return module_name_; }

private:
  void GetArgV(const char *path_to_binary,
               const char *(&argv)[kArgVMax]) const override {
    int i = 0;
    argv[i++] = path_to_binary;
    argv[i++] = "-iCfe";
    argv[i++] = module_name_;
    argv[i++] = nullptr;
  }

bool ReachedEndOfOutput(const char *buffer, uptr length) const override;

bool ReadFromSymbolizer(char *buffer, uptr max_length) override {
    if (!SymbolizerProcess::ReadFromSymbolizer(buffer, max_length))
      return false;
    // The returned buffer is empty when output is valid, but exceeds
    // max_length.
    if (*buffer == '\0')
      return true;
    // We should cut out output_terminator_ at the end of given buffer,
    // appended by addr2line to mark the end of its meaningful output.
    // We cannot scan buffer from it's beginning, because it is legal for it
    // to start with output_terminator_ in case given offset is invalid. So,
    // scanning from second character.
    char *garbage = internal_strstr(buffer + 1, output_terminator_);
    // This should never be NULL since buffer must end up with
    // output_terminator_.
    CHECK(garbage);
    // Trim the buffer.
    garbage[0] = '\0';
    return true;
  }

const char *module_name_;  // Owned, leaked.
  static const char output_terminator_[];
};

const char Addr2LineProcess::output_terminator_[] = "??\n??:0\n";

bool Addr2LineProcess::ReachedEndOfOutput(const char *buffer,
                                          uptr length) const {
  const size_t kTerminatorLen = sizeof(output_terminator_) - 1;
  // Skip, if we read just kTerminatorLen bytes, because Addr2Line output
  // should consist at least of two pairs of lines:
  // 1. First one, corresponding to given offset to be symbolized
  // (may be equal to output_terminator_, if offset is not valid).
  // 2. Second one for output_terminator_, itself to mark the end of output.
  if (length <= kTerminatorLen) return false;
  // Addr2Line output should end up with output_terminator_.
  return !internal_memcmp(buffer + length - kTerminatorLen,
                          output_terminator_, kTerminatorLen);
}

class Addr2LinePool : public SymbolizerTool {
 public:
  explicit Addr2LinePool(const char *addr2line_path,
                         LowLevelAllocator *allocator)
      : addr2line_path_(addr2line_path), allocator_(allocator) {
    addr2line_pool_.reserve(16);
  }

bool SymbolizePC(uptr addr, SymbolizedStack *stack) override {
    if (const char *buf =
            SendCommand(stack->info.module, stack->info.module_offset)) {
      ParseSymbolizePCOutput(buf, stack);
      return true;
    }
    return false;
  }

bool SymbolizeData(uptr addr, DataInfo *info) override {
    return false;
  }

private:
  const char *SendCommand(const char *module_name, uptr module_offset) {
    Addr2LineProcess *addr2line = 0;
    for (uptr i = 0; i < addr2line_pool_.size(); ++i) {
      if (0 ==
          internal_strcmp(module_name, addr2line_pool_[i]->module_name())) {
        addr2line = addr2line_pool_[i];
        break;
      }
    }
    if (!addr2line) {
      addr2line =
          new(*allocator_) Addr2LineProcess(addr2line_path_, module_name);
      addr2line_pool_.push_back(addr2line);
    }
    CHECK_EQ(0, internal_strcmp(module_name, addr2line->module_name()));
    char buffer[kBufferSize];
    internal_snprintf(buffer, kBufferSize, "0x%zx\n0x%zx\n",
                      module_offset, dummy_address_);
    return addr2line->SendCommand(buffer);
  }

static const uptr kBufferSize = 64;
  const char *addr2line_path_;
  LowLevelAllocator *allocator_;
  InternalMmapVector<Addr2LineProcess*> addr2line_pool_;
  static const uptr dummy_address_ =
      FIRST_32_SECOND_64(UINT32_MAX, UINT64_MAX);
};

#if SANITIZER_SUPPORTS_WEAK_HOOKS
extern "C" {
SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE bool
__sanitizer_symbolize_code(const char *ModuleName, u64 ModuleOffset,
                           char *Buffer, int MaxLength,
                           bool SymbolizeInlineFrames);
SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
bool __sanitizer_symbolize_data(const char *ModuleName, u64 ModuleOffset,
                                char *Buffer, int MaxLength);
SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
void __sanitizer_symbolize_flush();
SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
int __sanitizer_symbolize_demangle(const char *Name, char *Buffer,
                                   int MaxLength);
}  // extern "C"

class InternalSymbolizer : public SymbolizerTool {
 public:
  static InternalSymbolizer *get(LowLevelAllocator *alloc) {
    if (__sanitizer_symbolize_code != 0 &&
        __sanitizer_symbolize_data != 0) {
      return new(*alloc) InternalSymbolizer();
    }
    return 0;
  }

bool SymbolizePC(uptr addr, SymbolizedStack *stack) override {
    bool result = __sanitizer_symbolize_code(
        stack->info.module, stack->info.module_offset, buffer_, kBufferSize,
        common_flags()->symbolize_inline_frames);
    if (result) ParseSymbolizePCOutput(buffer_, stack);
    return result;
  }

bool SymbolizeData(uptr addr, DataInfo *info) override {
    bool result = __sanitizer_symbolize_data(info->module, info->module_offset,
                                             buffer_, kBufferSize);
    if (result) {
      ParseSymbolizeDataOutput(buffer_, info);
      info->start += (addr - info->module_offset);  // Add the base address.
    }
    return result;
  }

void Flush() override {
    if (__sanitizer_symbolize_flush)
      __sanitizer_symbolize_flush();
  }

const char *Demangle(const char *name) override {
    if (__sanitizer_symbolize_demangle) {
      for (uptr res_length = 1024;
           res_length <= InternalSizeClassMap::kMaxSize;) {
        char *res_buff = static_cast<char*>(InternalAlloc(res_length));
        uptr req_length =
            __sanitizer_symbolize_demangle(name, res_buff, res_length);
        if (req_length > res_length) {
          res_length = req_length + 1;
          InternalFree(res_buff);
          continue;
        }
        return res_buff;
      }
    }
    return name;
  }

private:
  InternalSymbolizer() { }

static const int kBufferSize = 16 * 1024;
  char buffer_[kBufferSize];
};
#else  // SANITIZER_SUPPORTS_WEAK_HOOKS

class InternalSymbolizer : public SymbolizerTool {
 public:
  static InternalSymbolizer *get(LowLevelAllocator *alloc) { return 0; }
};

#endif  // SANITIZER_SUPPORTS_WEAK_HOOKS

const char *Symbolizer::PlatformDemangle(const char *name) {
  return DemangleSwiftAndCXX(name);
}

static SymbolizerTool *ChooseExternalSymbolizer(LowLevelAllocator *allocator) {
  const char *path = common_flags()->external_symbolizer_path;
  const char *binary_name = path ? StripModuleName(path) : "";
  if (path && path[0] == '\0') {
    VReport(2, "External symbolizer is explicitly disabled.\n");
    return nullptr;
  } else if (!internal_strcmp(binary_name, "llvm-symbolizer")) {
    VReport(2, "Using llvm-symbolizer at user-specified path: %s\n", path);
    return new(*allocator) LLVMSymbolizer(path, allocator);
  } else if (!internal_strcmp(binary_name, "atos")) {
#if SANITIZER_MAC
    VReport(2, "Using atos at user-specified path: %s\n", path);
    return new(*allocator) AtosSymbolizer(path, allocator);
#else  // SANITIZER_MAC
    Report("ERROR: Using `atos` is only supported on Darwin.\n");
    Die();
#endif  // SANITIZER_MAC
  } else if (!internal_strcmp(binary_name, "addr2line")) {
    VReport(2, "Using addr2line at user-specified path: %s\n", path);
    return new(*allocator) Addr2LinePool(path, allocator);
  } else if (path) {
    Report("ERROR: External symbolizer path is set to '%s' which isn't "
           "a known symbolizer. Please set the path to the llvm-symbolizer "
           "binary or other known tool.\n", path);
    Die();
  }

// Otherwise symbolizer program is unknown, let's search $PATH
  CHECK(path == nullptr);
#if SANITIZER_MAC
  if (const char *found_path = FindPathToBinary("atos")) {
    VReport(2, "Using atos found at: %s\n", found_path);
    return new(*allocator) AtosSymbolizer(found_path, allocator);
  }
#endif  // SANITIZER_MAC
  if (const char *found_path = FindPathToBinary("llvm-symbolizer")) {
    VReport(2, "Using llvm-symbolizer found at: %s\n", found_path);
    return new(*allocator) LLVMSymbolizer(found_path, allocator);
  }
  if (common_flags()->allow_addr2line) {
    if (const char *found_path = FindPathToBinary("addr2line")) {
      VReport(2, "Using addr2line found at: %s\n", found_path);
      return new(*allocator) Addr2LinePool(found_path, allocator);
    }
  }
  return nullptr;
}

static void ChooseSymbolizerTools(IntrusiveList<SymbolizerTool> *list,
                                  LowLevelAllocator *allocator) {
  if (!common_flags()->symbolize) {
    VReport(2, "Symbolizer is disabled.\n");
    return;
  }
  if (IsAllocatorOutOfMemory()) {
    VReport(2, "Cannot use internal symbolizer: out of memory\n");
  } else if (SymbolizerTool *tool = InternalSymbolizer::get(allocator)) {
    VReport(2, "Using internal symbolizer.\n");
    list->push_back(tool);
    return;
  }
  if (SymbolizerTool *tool = LibbacktraceSymbolizer::get(allocator)) {
    VReport(2, "Using libbacktrace symbolizer.\n");
    list->push_back(tool);
    return;
  }

if (SymbolizerTool *tool = ChooseExternalSymbolizer(allocator)) {
    list->push_back(tool);
  }

#if SANITIZER_MAC
  VReport(2, "Using dladdr symbolizer.\n");
  list->push_back(new(*allocator) DlAddrSymbolizer());
#endif  // SANITIZER_MAC
}

Symbolizer *Symbolizer::PlatformInit() {
  IntrusiveList<SymbolizerTool> list;
  list.clear();
  ChooseSymbolizerTools(&list, &symbolizer_allocator_);
  return new(symbolizer_allocator_) Symbolizer(list);
}

void Symbolizer::LateInitialize() {
  Symbolizer::GetOrInit()->LateInitializeTools();
  InitializeSwiftDemangler();
}

}  // namespace __sanitizer

#endif  // SANITIZER_POSIX

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