1 files changed, 77 insertions, 43 deletions
diff --git a/contrib/llvm/lib/Support/Unix/Path.inc b/contrib/llvm/lib/Support/Unix/Path.inc
index 973d010..d85c37a 100644
--- a/contrib/llvm/lib/Support/Unix/Path.inc
+++ b/contrib/llvm/lib/Support/Unix/Path.inc
@@ -75,12 +75,12 @@ test_dir(char ret[PATH_MAX], const char *dir, const char *bin)
   char fullpath[PATH_MAX];
 
   snprintf(fullpath, PATH_MAX, "%s/%s", dir, bin);
-  if (realpath(fullpath, ret) == NULL)
-    return (1);
+  if (!realpath(fullpath, ret))
+    return 1;
   if (stat(fullpath, &sb) != 0)
-    return (1);
+    return 1;
 
-  return (0);
+  return 0;
 }
 
 static char *
@@ -91,34 +91,34 @@ getprogpath(char ret[PATH_MAX], const char *bin)
   /* First approach: absolute path. */
   if (bin[0] == '/') {
     if (test_dir(ret, "/", bin) == 0)
-      return (ret);
-    return (NULL);
+      return ret;
+    return nullptr;
   }
 
   /* Second approach: relative path. */
-  if (strchr(bin, '/') != NULL) {
+  if (strchr(bin, '/')) {
     char cwd[PATH_MAX];
-    if (getcwd(cwd, PATH_MAX) == NULL)
-      return (NULL);
+    if (!getcwd(cwd, PATH_MAX))
+      return nullptr;
     if (test_dir(ret, cwd, bin) == 0)
-      return (ret);
-    return (NULL);
+      return ret;
+    return nullptr;
   }
 
   /* Third approach: $PATH */
-  if ((pv = getenv("PATH")) == NULL)
-    return (NULL);
+  if ((pv = getenv("PATH")) == nullptr)
+    return nullptr;
   s = pv = strdup(pv);
-  if (pv == NULL)
-    return (NULL);
-  while ((t = strsep(&s, ":")) != NULL) {
+  if (!pv)
+    return nullptr;
+  while ((t = strsep(&s, ":")) != nullptr) {
     if (test_dir(ret, t, bin) == 0) {
       free(pv);
-      return (ret);
+      return ret;
     }
   }
   free(pv);
-  return (NULL);
+  return nullptr;
 }
 #endif // __FreeBSD__ || __NetBSD__ || __FreeBSD_kernel__
 
@@ -153,8 +153,8 @@ std::string getMainExecutable(const char *argv0, void *MainAddr) {
           return std::string(exe_path, len);
   } else {
       // Fall back to the classical detection.
-      if (getprogpath(exe_path, argv0) != NULL)
-          return exe_path;
+      if (getprogpath(exe_path, argv0))
+        return exe_path;
   }
 #elif defined(HAVE_DLFCN_H)
   // Use dladdr to get executable path if available.
@@ -219,11 +219,12 @@ std::error_code current_path(SmallVectorImpl<char> &result) {
   return std::error_code();
 }
 
-std::error_code create_directory(const Twine &path, bool IgnoreExisting) {
+std::error_code create_directory(const Twine &path, bool IgnoreExisting,
+                                 perms Perms) {
   SmallString<128> path_storage;
   StringRef p = path.toNullTerminatedStringRef(path_storage);
 
-  if (::mkdir(p.begin(), S_IRWXU | S_IRWXG) == -1) {
+  if (::mkdir(p.begin(), Perms) == -1) {
     if (errno != EEXIST || !IgnoreExisting)
       return std::error_code(errno, std::generic_category());
   }
@@ -324,6 +325,10 @@ std::error_code access(const Twine &Path, AccessMode Mode) {
   return std::error_code();
 }
 
+bool can_execute(const Twine &Path) {
+  return !access(Path, AccessMode::Execute);
+}
+
 bool equivalent(file_status A, file_status B) {
   assert(status_known(A) && status_known(B));
   return A.fs_st_dev == B.fs_st_dev &&
@@ -555,6 +560,54 @@ bool home_directory(SmallVectorImpl<char> &result) {
   return false;
 }
 
+static bool getDarwinConfDir(bool TempDir, SmallVectorImpl<char> &Result) {
+  #if defined(_CS_DARWIN_USER_TEMP_DIR) && defined(_CS_DARWIN_USER_CACHE_DIR)
+  // On Darwin, use DARWIN_USER_TEMP_DIR or DARWIN_USER_CACHE_DIR.
+  // macros defined in <unistd.h> on darwin >= 9
+  int ConfName = TempDir ? _CS_DARWIN_USER_TEMP_DIR
+                         : _CS_DARWIN_USER_CACHE_DIR;
+  size_t ConfLen = confstr(ConfName, nullptr, 0);
+  if (ConfLen > 0) {
+    do {
+      Result.resize(ConfLen);
+      ConfLen = confstr(ConfName, Result.data(), Result.size());
+    } while (ConfLen > 0 && ConfLen != Result.size());
+
+    if (ConfLen > 0) {
+      assert(Result.back() == 0);
+      Result.pop_back();
+      return true;
+    }
+
+    Result.clear();
+  }
+  #endif
+  return false;
+}
+
+static bool getUserCacheDir(SmallVectorImpl<char> &Result) {
+  // First try using XDS_CACHE_HOME env variable,
+  // as specified in XDG Base Directory Specification at
+  // http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
+  if (const char *XdsCacheDir = std::getenv("XDS_CACHE_HOME")) {
+    Result.clear();
+    Result.append(XdsCacheDir, XdsCacheDir + strlen(XdsCacheDir));
+    return true;
+  }
+
+  // Try Darwin configuration query
+  if (getDarwinConfDir(false, Result))
+    return true;
+
+  // Use "$HOME/.cache" if $HOME is available
+  if (home_directory(Result)) {
+    append(Result, ".cache");
+    return true;
+  }
+
+  return false;
+}
+
 static const char *getEnvTempDir() {
   // Check whether the temporary directory is specified by an environment
   // variable.
@@ -589,27 +642,8 @@ void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
     }
   }
 
-#if defined(_CS_DARWIN_USER_TEMP_DIR) && defined(_CS_DARWIN_USER_CACHE_DIR)
-  // On Darwin, use DARWIN_USER_TEMP_DIR or DARWIN_USER_CACHE_DIR.
-  // macros defined in <unistd.h> on darwin >= 9
-  int ConfName = ErasedOnReboot? _CS_DARWIN_USER_TEMP_DIR
-                               : _CS_DARWIN_USER_CACHE_DIR;
-  size_t ConfLen = confstr(ConfName, nullptr, 0);
-  if (ConfLen > 0) {
-    do {
-      Result.resize(ConfLen);
-      ConfLen = confstr(ConfName, Result.data(), Result.size());
-    } while (ConfLen > 0 && ConfLen != Result.size());
-
-    if (ConfLen > 0) {
-      assert(Result.back() == 0);
-      Result.pop_back();
-      return;
-    }
-
-    Result.clear();
-  }
-#endif
+  if (getDarwinConfDir(ErasedOnReboot, Result))
+    return;
 
   const char *RequestedDir = getDefaultTempDir(ErasedOnReboot);
   Result.append(RequestedDir, RequestedDir + strlen(RequestedDir));