Import LLVM 10.0.0 release including clang, lld and lldb.

ok hackroom
tested by plenty

1 files changed, 662 insertions, 0 deletions

diff --git a/gnu/llvm/lldb/source/Symbol/LocateSymbolFileMacOSX.cpp b/gnu/llvm/lldb/source/Symbol/LocateSymbolFileMacOSX.cpp
new file mode 100644
index 00000000000..5ee632ec207
--- /dev/null
+++ b/gnu/llvm/lldb/source/Symbol/LocateSymbolFileMacOSX.cpp
@@ -0,0 +1,662 @@
+//===-- LocateSymbolFileMacOSX.cpp ------------------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Symbol/LocateSymbolFile.h"
+
+#include <dirent.h>
+#include <dlfcn.h>
+#include <pwd.h>
+
+#include <CoreFoundation/CoreFoundation.h>
+
+#include "Host/macosx/cfcpp/CFCBundle.h"
+#include "Host/macosx/cfcpp/CFCData.h"
+#include "Host/macosx/cfcpp/CFCReleaser.h"
+#include "Host/macosx/cfcpp/CFCString.h"
+#include "lldb/Core/ModuleList.h"
+#include "lldb/Core/ModuleSpec.h"
+#include "lldb/Host/Host.h"
+#include "lldb/Symbol/ObjectFile.h"
+#include "lldb/Utility/ArchSpec.h"
+#include "lldb/Utility/DataBuffer.h"
+#include "lldb/Utility/DataExtractor.h"
+#include "lldb/Utility/Endian.h"
+#include "lldb/Utility/Log.h"
+#include "lldb/Utility/StreamString.h"
+#include "lldb/Utility/Timer.h"
+#include "lldb/Utility/UUID.h"
+#include "mach/machine.h"
+
+#include "llvm/ADT/ScopeExit.h"
+#include "llvm/Support/FileSystem.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+static CFURLRef (*g_dlsym_DBGCopyFullDSYMURLForUUID)(CFUUIDRef uuid, CFURLRef exec_url) = nullptr;
+static CFDictionaryRef (*g_dlsym_DBGCopyDSYMPropertyLists)(CFURLRef dsym_url) = nullptr;
+
+int LocateMacOSXFilesUsingDebugSymbols(const ModuleSpec &module_spec,
+                                       ModuleSpec &return_module_spec) {
+  Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_HOST);
+  if (!ModuleList::GetGlobalModuleListProperties().GetEnableExternalLookup()) {
+    LLDB_LOGF(log, "Spotlight lookup for .dSYM bundles is disabled.");
+    return 0;
+  }
+
+  return_module_spec = module_spec;
+  return_module_spec.GetFileSpec().Clear();
+  return_module_spec.GetSymbolFileSpec().Clear();
+
+  int items_found = 0;
+
+  if (g_dlsym_DBGCopyFullDSYMURLForUUID == nullptr ||
+      g_dlsym_DBGCopyDSYMPropertyLists == nullptr) {
+    void *handle = dlopen ("/System/Library/PrivateFrameworks/DebugSymbols.framework/DebugSymbols", RTLD_LAZY | RTLD_LOCAL);
+    if (handle) {
+      g_dlsym_DBGCopyFullDSYMURLForUUID = (CFURLRef (*)(CFUUIDRef, CFURLRef)) dlsym (handle, "DBGCopyFullDSYMURLForUUID");
+      g_dlsym_DBGCopyDSYMPropertyLists = (CFDictionaryRef (*)(CFURLRef)) dlsym (handle, "DBGCopyDSYMPropertyLists");
+    }
+  }
+
+  if (g_dlsym_DBGCopyFullDSYMURLForUUID == nullptr ||
+      g_dlsym_DBGCopyDSYMPropertyLists == nullptr) {
+    return items_found;
+  }
+
+  const UUID *uuid = module_spec.GetUUIDPtr();
+  const ArchSpec *arch = module_spec.GetArchitecturePtr();
+
+  if (uuid && uuid->IsValid()) {
+    // Try and locate the dSYM file using DebugSymbols first
+    llvm::ArrayRef<uint8_t> module_uuid = uuid->GetBytes();
+    if (module_uuid.size() == 16) {
+      CFCReleaser<CFUUIDRef> module_uuid_ref(::CFUUIDCreateWithBytes(
+          NULL, module_uuid[0], module_uuid[1], module_uuid[2], module_uuid[3],
+          module_uuid[4], module_uuid[5], module_uuid[6], module_uuid[7],
+          module_uuid[8], module_uuid[9], module_uuid[10], module_uuid[11],
+          module_uuid[12], module_uuid[13], module_uuid[14], module_uuid[15]));
+
+      if (module_uuid_ref.get()) {
+        CFCReleaser<CFURLRef> exec_url;
+        const FileSpec *exec_fspec = module_spec.GetFileSpecPtr();
+        if (exec_fspec) {
+          char exec_cf_path[PATH_MAX];
+          if (exec_fspec->GetPath(exec_cf_path, sizeof(exec_cf_path)))
+            exec_url.reset(::CFURLCreateFromFileSystemRepresentation(
+                NULL, (const UInt8 *)exec_cf_path, strlen(exec_cf_path),
+                FALSE));
+        }
+
+        CFCReleaser<CFURLRef> dsym_url(
+            g_dlsym_DBGCopyFullDSYMURLForUUID(module_uuid_ref.get(), exec_url.get()));
+        char path[PATH_MAX];
+
+        if (dsym_url.get()) {
+          if (::CFURLGetFileSystemRepresentation(
+                  dsym_url.get(), true, (UInt8 *)path, sizeof(path) - 1)) {
+            if (log) {
+              LLDB_LOGF(log,
+                        "DebugSymbols framework returned dSYM path of %s for "
+                        "UUID %s -- looking for the dSYM",
+                        path, uuid->GetAsString().c_str());
+            }
+            FileSpec dsym_filespec(path);
+            if (path[0] == '~')
+              FileSystem::Instance().Resolve(dsym_filespec);
+
+            if (FileSystem::Instance().IsDirectory(dsym_filespec)) {
+              dsym_filespec =
+                  Symbols::FindSymbolFileInBundle(dsym_filespec, uuid, arch);
+              ++items_found;
+            } else {
+              ++items_found;
+            }
+            return_module_spec.GetSymbolFileSpec() = dsym_filespec;
+          }
+
+          bool success = false;
+          if (log) {
+            if (::CFURLGetFileSystemRepresentation(
+                    dsym_url.get(), true, (UInt8 *)path, sizeof(path) - 1)) {
+              LLDB_LOGF(log,
+                        "DebugSymbols framework returned dSYM path of %s for "
+                        "UUID %s -- looking for an exec file",
+                        path, uuid->GetAsString().c_str());
+            }
+          }
+
+          CFCReleaser<CFDictionaryRef> dict(
+              g_dlsym_DBGCopyDSYMPropertyLists(dsym_url.get()));
+          CFDictionaryRef uuid_dict = NULL;
+          if (dict.get()) {
+            CFCString uuid_cfstr(uuid->GetAsString().c_str());
+            uuid_dict = static_cast<CFDictionaryRef>(
+                ::CFDictionaryGetValue(dict.get(), uuid_cfstr.get()));
+          }
+          if (uuid_dict) {
+            CFStringRef exec_cf_path =
+                static_cast<CFStringRef>(::CFDictionaryGetValue(
+                    uuid_dict, CFSTR("DBGSymbolRichExecutable")));
+            if (exec_cf_path && ::CFStringGetFileSystemRepresentation(
+                                    exec_cf_path, path, sizeof(path))) {
+              if (log) {
+                LLDB_LOGF(log, "plist bundle has exec path of %s for UUID %s",
+                          path, uuid->GetAsString().c_str());
+              }
+              ++items_found;
+              FileSpec exec_filespec(path);
+              if (path[0] == '~')
+                FileSystem::Instance().Resolve(exec_filespec);
+              if (FileSystem::Instance().Exists(exec_filespec)) {
+                success = true;
+                return_module_spec.GetFileSpec() = exec_filespec;
+              }
+            }
+          }
+
+          if (!success) {
+            // No dictionary, check near the dSYM bundle for an executable that
+            // matches...
+            if (::CFURLGetFileSystemRepresentation(
+                    dsym_url.get(), true, (UInt8 *)path, sizeof(path) - 1)) {
+              char *dsym_extension_pos = ::strstr(path, ".dSYM");
+              if (dsym_extension_pos) {
+                *dsym_extension_pos = '\0';
+                if (log) {
+                  LLDB_LOGF(log,
+                            "Looking for executable binary next to dSYM "
+                            "bundle with name with name %s",
+                            path);
+                }
+                FileSpec file_spec(path);
+                FileSystem::Instance().Resolve(file_spec);
+                ModuleSpecList module_specs;
+                ModuleSpec matched_module_spec;
+                using namespace llvm::sys::fs;
+                switch (get_file_type(file_spec.GetPath())) {
+
+                case file_type::directory_file: // Bundle directory?
+                {
+                  CFCBundle bundle(path);
+                  CFCReleaser<CFURLRef> bundle_exe_url(
+                      bundle.CopyExecutableURL());
+                  if (bundle_exe_url.get()) {
+                    if (::CFURLGetFileSystemRepresentation(bundle_exe_url.get(),
+                                                           true, (UInt8 *)path,
+                                                           sizeof(path) - 1)) {
+                      FileSpec bundle_exe_file_spec(path);
+                      FileSystem::Instance().Resolve(bundle_exe_file_spec);
+                      if (ObjectFile::GetModuleSpecifications(
+                              bundle_exe_file_spec, 0, 0, module_specs) &&
+                          module_specs.FindMatchingModuleSpec(
+                              module_spec, matched_module_spec))
+
+                      {
+                        ++items_found;
+                        return_module_spec.GetFileSpec() = bundle_exe_file_spec;
+                        if (log) {
+                          LLDB_LOGF(log,
+                                    "Executable binary %s next to dSYM is "
+                                    "compatible; using",
+                                    path);
+                        }
+                      }
+                    }
+                  }
+                } break;
+
+                case file_type::fifo_file:      // Forget pipes
+                case file_type::socket_file:    // We can't process socket files
+                case file_type::file_not_found: // File doesn't exist...
+                case file_type::status_error:
+                  break;
+
+                case file_type::type_unknown:
+                case file_type::regular_file:
+                case file_type::symlink_file:
+                case file_type::block_file:
+                case file_type::character_file:
+                  if (ObjectFile::GetModuleSpecifications(file_spec, 0, 0,
+                                                          module_specs) &&
+                      module_specs.FindMatchingModuleSpec(module_spec,
+                                                          matched_module_spec))
+
+                  {
+                    ++items_found;
+                    return_module_spec.GetFileSpec() = file_spec;
+                    if (log) {
+                      LLDB_LOGF(log,
+                                "Executable binary %s next to dSYM is "
+                                "compatible; using",
+                                path);
+                    }
+                  }
+                  break;
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+
+  return items_found;
+}
+
+FileSpec Symbols::FindSymbolFileInBundle(const FileSpec &dsym_bundle_fspec,
+                                         const lldb_private::UUID *uuid,
+                                         const ArchSpec *arch) {
+  char path[PATH_MAX];
+  if (dsym_bundle_fspec.GetPath(path, sizeof(path)) == 0)
+    return {};
+
+  ::strncat(path, "/Contents/Resources/DWARF", sizeof(path) - strlen(path) - 1);
+
+  DIR *dirp = opendir(path);
+  if (!dirp)
+    return {};
+
+  // Make sure we close the directory before exiting this scope.
+  auto cleanup_dir = llvm::make_scope_exit([&]() { closedir(dirp); });
+
+  FileSpec dsym_fspec;
+  dsym_fspec.GetDirectory().SetCString(path);
+  struct dirent *dp;
+  while ((dp = readdir(dirp)) != NULL) {
+    // Only search directories
+    if (dp->d_type == DT_DIR || dp->d_type == DT_UNKNOWN) {
+      if (dp->d_namlen == 1 && dp->d_name[0] == '.')
+        continue;
+
+      if (dp->d_namlen == 2 && dp->d_name[0] == '.' && dp->d_name[1] == '.')
+        continue;
+    }
+
+    if (dp->d_type == DT_REG || dp->d_type == DT_UNKNOWN) {
+      dsym_fspec.GetFilename().SetCString(dp->d_name);
+      ModuleSpecList module_specs;
+      if (ObjectFile::GetModuleSpecifications(dsym_fspec, 0, 0, module_specs)) {
+        ModuleSpec spec;
+        for (size_t i = 0; i < module_specs.GetSize(); ++i) {
+          bool got_spec = module_specs.GetModuleSpecAtIndex(i, spec);
+          UNUSED_IF_ASSERT_DISABLED(got_spec);
+          assert(got_spec);
+          if ((uuid == NULL ||
+               (spec.GetUUIDPtr() && spec.GetUUID() == *uuid)) &&
+              (arch == NULL ||
+               (spec.GetArchitecturePtr() &&
+                spec.GetArchitecture().IsCompatibleMatch(*arch)))) {
+            return dsym_fspec;
+          }
+        }
+      }
+    }
+  }
+
+  return {};
+}
+
+static bool GetModuleSpecInfoFromUUIDDictionary(CFDictionaryRef uuid_dict,
+                                                ModuleSpec &module_spec) {
+  Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_HOST);
+  bool success = false;
+  if (uuid_dict != NULL && CFGetTypeID(uuid_dict) == CFDictionaryGetTypeID()) {
+    std::string str;
+    CFStringRef cf_str;
+    CFDictionaryRef cf_dict;
+
+    cf_str = (CFStringRef)CFDictionaryGetValue(
+        (CFDictionaryRef)uuid_dict, CFSTR("DBGSymbolRichExecutable"));
+    if (cf_str && CFGetTypeID(cf_str) == CFStringGetTypeID()) {
+      if (CFCString::FileSystemRepresentation(cf_str, str)) {
+        module_spec.GetFileSpec().SetFile(str.c_str(), FileSpec::Style::native);
+        FileSystem::Instance().Resolve(module_spec.GetFileSpec());
+        if (log) {
+          LLDB_LOGF(log,
+                    "From dsymForUUID plist: Symbol rich executable is at '%s'",
+                    str.c_str());
+        }
+      }
+    }
+
+    cf_str = (CFStringRef)CFDictionaryGetValue((CFDictionaryRef)uuid_dict,
+                                               CFSTR("DBGDSYMPath"));
+    if (cf_str && CFGetTypeID(cf_str) == CFStringGetTypeID()) {
+      if (CFCString::FileSystemRepresentation(cf_str, str)) {
+        module_spec.GetSymbolFileSpec().SetFile(str.c_str(),
+                                                FileSpec::Style::native);
+        FileSystem::Instance().Resolve(module_spec.GetFileSpec());
+        success = true;
+        if (log) {
+          LLDB_LOGF(log, "From dsymForUUID plist: dSYM is at '%s'",
+                    str.c_str());
+        }
+      }
+    }
+
+    cf_str = (CFStringRef)CFDictionaryGetValue((CFDictionaryRef)uuid_dict,
+                                               CFSTR("DBGArchitecture"));
+    if (cf_str && CFGetTypeID(cf_str) == CFStringGetTypeID()) {
+      if (CFCString::FileSystemRepresentation(cf_str, str))
+        module_spec.GetArchitecture().SetTriple(str.c_str());
+    }
+
+    std::string DBGBuildSourcePath;
+    std::string DBGSourcePath;
+
+    // If DBGVersion 1 or DBGVersion missing, ignore DBGSourcePathRemapping.
+    // If DBGVersion 2, strip last two components of path remappings from
+    //                  entries to fix an issue with a specific set of
+    //                  DBGSourcePathRemapping entries that lldb worked
+    //                  with.
+    // If DBGVersion 3, trust & use the source path remappings as-is.
+    //
+    cf_dict = (CFDictionaryRef)CFDictionaryGetValue(
+        (CFDictionaryRef)uuid_dict, CFSTR("DBGSourcePathRemapping"));
+    if (cf_dict && CFGetTypeID(cf_dict) == CFDictionaryGetTypeID()) {
+      // If we see DBGVersion with a value of 2 or higher, this is a new style
+      // DBGSourcePathRemapping dictionary
+      bool new_style_source_remapping_dictionary = false;
+      bool do_truncate_remapping_names = false;
+      std::string original_DBGSourcePath_value = DBGSourcePath;
+      cf_str = (CFStringRef)CFDictionaryGetValue((CFDictionaryRef)uuid_dict,
+                                                 CFSTR("DBGVersion"));
+      if (cf_str && CFGetTypeID(cf_str) == CFStringGetTypeID()) {
+        std::string version;
+        CFCString::FileSystemRepresentation(cf_str, version);
+        if (!version.empty() && isdigit(version[0])) {
+          int version_number = atoi(version.c_str());
+          if (version_number > 1) {
+            new_style_source_remapping_dictionary = true;
+          }
+          if (version_number == 2) {
+            do_truncate_remapping_names = true;
+          }
+        }
+      }
+
+      CFIndex kv_pair_count = CFDictionaryGetCount((CFDictionaryRef)uuid_dict);
+      if (kv_pair_count > 0) {
+        CFStringRef *keys =
+            (CFStringRef *)malloc(kv_pair_count * sizeof(CFStringRef));
+        CFStringRef *values =
+            (CFStringRef *)malloc(kv_pair_count * sizeof(CFStringRef));
+        if (keys != nullptr && values != nullptr) {
+          CFDictionaryGetKeysAndValues((CFDictionaryRef)uuid_dict,
+                                       (const void **)keys,
+                                       (const void **)values);
+        }
+        for (CFIndex i = 0; i < kv_pair_count; i++) {
+          DBGBuildSourcePath.clear();
+          DBGSourcePath.clear();
+          if (keys[i] && CFGetTypeID(keys[i]) == CFStringGetTypeID()) {
+            CFCString::FileSystemRepresentation(keys[i], DBGBuildSourcePath);
+          }
+          if (values[i] && CFGetTypeID(values[i]) == CFStringGetTypeID()) {
+            CFCString::FileSystemRepresentation(values[i], DBGSourcePath);
+          }
+          if (!DBGBuildSourcePath.empty() && !DBGSourcePath.empty()) {
+            // In the "old style" DBGSourcePathRemapping dictionary, the
+            // DBGSourcePath values (the "values" half of key-value path pairs)
+            // were wrong.  Ignore them and use the universal DBGSourcePath
+            // string from earlier.
+            if (new_style_source_remapping_dictionary &&
+                !original_DBGSourcePath_value.empty()) {
+              DBGSourcePath = original_DBGSourcePath_value;
+            }
+            if (DBGSourcePath[0] == '~') {
+              FileSpec resolved_source_path(DBGSourcePath.c_str());
+              FileSystem::Instance().Resolve(resolved_source_path);
+              DBGSourcePath = resolved_source_path.GetPath();
+            }
+            // With version 2 of DBGSourcePathRemapping, we can chop off the
+            // last two filename parts from the source remapping and get a more
+            // general source remapping that still works. Add this as another
+            // option in addition to the full source path remap.
+            module_spec.GetSourceMappingList().Append(
+                ConstString(DBGBuildSourcePath.c_str()),
+                ConstString(DBGSourcePath.c_str()), true);
+            if (do_truncate_remapping_names) {
+              FileSpec build_path(DBGBuildSourcePath.c_str());
+              FileSpec source_path(DBGSourcePath.c_str());
+              build_path.RemoveLastPathComponent();
+              build_path.RemoveLastPathComponent();
+              source_path.RemoveLastPathComponent();
+              source_path.RemoveLastPathComponent();
+              module_spec.GetSourceMappingList().Append(
+                  ConstString(build_path.GetPath().c_str()),
+                  ConstString(source_path.GetPath().c_str()), true);
+            }
+          }
+        }
+        if (keys)
+          free(keys);
+        if (values)
+          free(values);
+      }
+    }
+
+    // If we have a DBGBuildSourcePath + DBGSourcePath pair, append them to the
+    // source remappings list.
+
+    cf_str = (CFStringRef)CFDictionaryGetValue((CFDictionaryRef)uuid_dict,
+                                               CFSTR("DBGBuildSourcePath"));
+    if (cf_str && CFGetTypeID(cf_str) == CFStringGetTypeID()) {
+      CFCString::FileSystemRepresentation(cf_str, DBGBuildSourcePath);
+    }
+
+    cf_str = (CFStringRef)CFDictionaryGetValue((CFDictionaryRef)uuid_dict,
+                                               CFSTR("DBGSourcePath"));
+    if (cf_str && CFGetTypeID(cf_str) == CFStringGetTypeID()) {
+      CFCString::FileSystemRepresentation(cf_str, DBGSourcePath);
+    }
+
+    if (!DBGBuildSourcePath.empty() && !DBGSourcePath.empty()) {
+      if (DBGSourcePath[0] == '~') {
+        FileSpec resolved_source_path(DBGSourcePath.c_str());
+        FileSystem::Instance().Resolve(resolved_source_path);
+        DBGSourcePath = resolved_source_path.GetPath();
+      }
+      module_spec.GetSourceMappingList().Append(
+          ConstString(DBGBuildSourcePath.c_str()),
+          ConstString(DBGSourcePath.c_str()), true);
+    }
+  }
+  return success;
+}
+
+bool Symbols::DownloadObjectAndSymbolFile(ModuleSpec &module_spec,
+                                          bool force_lookup) {
+  bool success = false;
+  const UUID *uuid_ptr = module_spec.GetUUIDPtr();
+  const FileSpec *file_spec_ptr = module_spec.GetFileSpecPtr();
+
+  // It's expensive to check for the DBGShellCommands defaults setting, only do
+  // it once per lldb run and cache the result.
+  static bool g_have_checked_for_dbgshell_command = false;
+  static const char *g_dbgshell_command = NULL;
+  if (!g_have_checked_for_dbgshell_command) {
+    g_have_checked_for_dbgshell_command = true;
+    CFTypeRef defaults_setting = CFPreferencesCopyAppValue(
+        CFSTR("DBGShellCommands"), CFSTR("com.apple.DebugSymbols"));
+    if (defaults_setting &&
+        CFGetTypeID(defaults_setting) == CFStringGetTypeID()) {
+      char cstr_buf[PATH_MAX];
+      if (CFStringGetCString((CFStringRef)defaults_setting, cstr_buf,
+                             sizeof(cstr_buf), kCFStringEncodingUTF8)) {
+        g_dbgshell_command =
+            strdup(cstr_buf); // this malloc'ed memory will never be freed
+      }
+    }
+    if (defaults_setting) {
+      CFRelease(defaults_setting);
+    }
+  }
+
+  // When g_dbgshell_command is NULL, the user has not enabled the use of an
+  // external program to find the symbols, don't run it for them.
+  if (!force_lookup && g_dbgshell_command == NULL) {
+    return false;
+  }
+
+  if (uuid_ptr ||
+      (file_spec_ptr && FileSystem::Instance().Exists(*file_spec_ptr))) {
+    static bool g_located_dsym_for_uuid_exe = false;
+    static bool g_dsym_for_uuid_exe_exists = false;
+    static char g_dsym_for_uuid_exe_path[PATH_MAX];
+    if (!g_located_dsym_for_uuid_exe) {
+      g_located_dsym_for_uuid_exe = true;
+      const char *dsym_for_uuid_exe_path_cstr =
+          getenv("LLDB_APPLE_DSYMFORUUID_EXECUTABLE");
+      FileSpec dsym_for_uuid_exe_spec;
+      if (dsym_for_uuid_exe_path_cstr) {
+        dsym_for_uuid_exe_spec.SetFile(dsym_for_uuid_exe_path_cstr,
+                                       FileSpec::Style::native);
+        FileSystem::Instance().Resolve(dsym_for_uuid_exe_spec);
+        g_dsym_for_uuid_exe_exists =
+            FileSystem::Instance().Exists(dsym_for_uuid_exe_spec);
+      }
+
+      if (!g_dsym_for_uuid_exe_exists) {
+        dsym_for_uuid_exe_spec.SetFile("/usr/local/bin/dsymForUUID",
+                                       FileSpec::Style::native);
+        g_dsym_for_uuid_exe_exists =
+            FileSystem::Instance().Exists(dsym_for_uuid_exe_spec);
+        if (!g_dsym_for_uuid_exe_exists) {
+          long bufsize;
+          if ((bufsize = sysconf(_SC_GETPW_R_SIZE_MAX)) != -1) {
+            char buffer[bufsize];
+            struct passwd pwd;
+            struct passwd *tilde_rc = NULL;
+            // we are a library so we need to use the reentrant version of
+            // getpwnam()
+            if (getpwnam_r("rc", &pwd, buffer, bufsize, &tilde_rc) == 0 &&
+                tilde_rc && tilde_rc->pw_dir) {
+              std::string dsymforuuid_path(tilde_rc->pw_dir);
+              dsymforuuid_path += "/bin/dsymForUUID";
+              dsym_for_uuid_exe_spec.SetFile(dsymforuuid_path.c_str(),
+                                             FileSpec::Style::native);
+              g_dsym_for_uuid_exe_exists =
+                  FileSystem::Instance().Exists(dsym_for_uuid_exe_spec);
+            }
+          }
+        }
+      }
+      if (!g_dsym_for_uuid_exe_exists && g_dbgshell_command != NULL) {
+        dsym_for_uuid_exe_spec.SetFile(g_dbgshell_command,
+                                       FileSpec::Style::native);
+        FileSystem::Instance().Resolve(dsym_for_uuid_exe_spec);
+        g_dsym_for_uuid_exe_exists =
+            FileSystem::Instance().Exists(dsym_for_uuid_exe_spec);
+      }
+
+      if (g_dsym_for_uuid_exe_exists)
+        dsym_for_uuid_exe_spec.GetPath(g_dsym_for_uuid_exe_path,
+                                       sizeof(g_dsym_for_uuid_exe_path));
+    }
+    if (g_dsym_for_uuid_exe_exists) {
+      std::string uuid_str;
+      char file_path[PATH_MAX];
+      file_path[0] = '\0';
+
+      if (uuid_ptr)
+        uuid_str = uuid_ptr->GetAsString();
+
+      if (file_spec_ptr)
+        file_spec_ptr->GetPath(file_path, sizeof(file_path));
+
+      StreamString command;
+      if (!uuid_str.empty())
+        command.Printf("%s --ignoreNegativeCache --copyExecutable %s",
+                       g_dsym_for_uuid_exe_path, uuid_str.c_str());
+      else if (file_path[0] != '\0')
+        command.Printf("%s --ignoreNegativeCache --copyExecutable %s",
+                       g_dsym_for_uuid_exe_path, file_path);
+
+      if (!command.GetString().empty()) {
+        Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_HOST);
+        int exit_status = -1;
+        int signo = -1;
+        std::string command_output;
+        if (log) {
+          if (!uuid_str.empty())
+            LLDB_LOGF(log, "Calling %s with UUID %s to find dSYM",
+                      g_dsym_for_uuid_exe_path, uuid_str.c_str());
+          else if (file_path[0] != '\0')
+            LLDB_LOGF(log, "Calling %s with file %s to find dSYM",
+                      g_dsym_for_uuid_exe_path, file_path);
+        }
+        Status error = Host::RunShellCommand(
+            command.GetData(),
+            FileSpec(),      // current working directory
+            &exit_status,    // Exit status
+            &signo,          // Signal int *
+            &command_output, // Command output
+            std::chrono::seconds(
+               120), // Large timeout to allow for long dsym download times
+            false);  // Don't run in a shell (we don't need shell expansion)
+        if (error.Success() && exit_status == 0 && !command_output.empty()) {
+          CFCData data(CFDataCreateWithBytesNoCopy(
+              NULL, (const UInt8 *)command_output.data(), command_output.size(),
+              kCFAllocatorNull));
+
+          CFCReleaser<CFDictionaryRef> plist(
+              (CFDictionaryRef)::CFPropertyListCreateFromXMLData(
+                  NULL, data.get(), kCFPropertyListImmutable, NULL));
+
+          if (plist.get() &&
+              CFGetTypeID(plist.get()) == CFDictionaryGetTypeID()) {
+            if (!uuid_str.empty()) {
+              CFCString uuid_cfstr(uuid_str.c_str());
+              CFDictionaryRef uuid_dict = (CFDictionaryRef)CFDictionaryGetValue(
+                  plist.get(), uuid_cfstr.get());
+              success =
+                  GetModuleSpecInfoFromUUIDDictionary(uuid_dict, module_spec);
+            } else {
+              const CFIndex num_values = ::CFDictionaryGetCount(plist.get());
+              if (num_values > 0) {
+                std::vector<CFStringRef> keys(num_values, NULL);
+                std::vector<CFDictionaryRef> values(num_values, NULL);
+                ::CFDictionaryGetKeysAndValues(plist.get(), NULL,
+                                               (const void **)&values[0]);
+                if (num_values == 1) {
+                  return GetModuleSpecInfoFromUUIDDictionary(values[0],
+                                                             module_spec);
+                } else {
+                  for (CFIndex i = 0; i < num_values; ++i) {
+                    ModuleSpec curr_module_spec;
+                    if (GetModuleSpecInfoFromUUIDDictionary(values[i],
+                                                            curr_module_spec)) {
+                      if (module_spec.GetArchitecture().IsCompatibleMatch(
+                              curr_module_spec.GetArchitecture())) {
+                        module_spec = curr_module_spec;
+                        return true;
+                      }
+                    }
+                  }
+                }
+              }
+            }
+          }
+        } else {
+          if (log) {
+            if (!uuid_str.empty())
+              LLDB_LOGF(log, "Called %s on %s, no matches",
+                        g_dsym_for_uuid_exe_path, uuid_str.c_str());
+            else if (file_path[0] != '\0')
+              LLDB_LOGF(log, "Called %s on %s, no matches",
+                        g_dsym_for_uuid_exe_path, file_path);
+          }
+        }
+      }
+    }
+  }
+  return success;
+}