Simplify remove, create_directory and create_directories.

Before this patch they would take an boolean argument to say if the path
already existed. This was redundant with the returned error_code which is able
to represent that. This allowed for callers to incorrectly check only the
existed flag instead of first checking the error code.

Instead, pass in a boolean flag to say if the previous (non-)existence should be
an error or not.

Callers of the of the old simple versions are not affected. They still ignore
the previous (non-)existence as they did before.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201979 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 34 insertions, 52 deletions

diff --git a/lib/Support/Path.cpp b/lib/Support/Path.cpp
index b21846c548..535ff00bae 100644
--- a/lib/Support/Path.cpp
+++ b/lib/Support/Path.cpp
@@ -751,12 +751,12 @@ error_code make_absolute(SmallVectorImpl<char> &path) {
                    "occurred above!");
 }
 
-error_code create_directories(const Twine &Path, bool &Existed) {
+error_code create_directories(const Twine &Path, bool IgnoreExisting) {
   SmallString<128> PathStorage;
   StringRef P = Path.toStringRef(PathStorage);
 
   // Be optimistic and try to create the directory
-  error_code EC = create_directory(P, Existed);
+  error_code EC = create_directory(P, IgnoreExisting);
   // If we succeeded, or had any error other than the parent not existing, just
   // return it.
   if (EC != errc::no_such_file_or_directory)
@@ -771,7 +771,7 @@ error_code create_directories(const Twine &Path, bool &Existed) {
   if ((EC = create_directories(Parent)))
       return EC;
 
-  return create_directory(P, Existed);
+  return create_directory(P, IgnoreExisting);
 }
 
 bool exists(file_status status) {
diff --git a/lib/Support/Unix/Path.inc b/lib/Support/Unix/Path.inc
index 20e9642897..83d2b4284a 100644
--- a/lib/Support/Unix/Path.inc
+++ b/lib/Support/Unix/Path.inc
@@ -164,12 +164,11 @@ retry_random_path:
   }
 
   case FS_Dir: {
-    bool Existed;
-    error_code EC = sys::fs::create_directory(ResultPath.begin(), Existed);
-    if (EC)
+    if (error_code EC = sys::fs::create_directory(ResultPath.begin(), false)) {
+      if (EC == errc::file_exists)
+        goto retry_random_path;
       return EC;
-    if (Existed)
-      goto retry_random_path;
+    }
     return error_code::success();
   }
   }
@@ -333,16 +332,14 @@ error_code current_path(SmallVectorImpl<char> &result) {
   return error_code::success();
 }
 
-error_code create_directory(const Twine &path, bool &existed) {
+error_code create_directory(const Twine &path, bool IgnoreExisting) {
   SmallString<128> path_storage;
   StringRef p = path.toNullTerminatedStringRef(path_storage);
 
   if (::mkdir(p.begin(), S_IRWXU | S_IRWXG) == -1) {
-    if (errno != errc::file_exists)
+    if (errno != errc::file_exists || !IgnoreExisting)
       return error_code(errno, system_category());
-    existed = true;
-  } else
-    existed = false;
+  }
 
   return error_code::success();
 }
@@ -360,15 +357,14 @@ error_code create_hard_link(const Twine &to, const Twine &from) {
   return error_code::success();
 }
 
-error_code remove(const Twine &path, bool &existed) {
+error_code remove(const Twine &path, bool IgnoreNonExisting) {
   SmallString<128> path_storage;
   StringRef p = path.toNullTerminatedStringRef(path_storage);
 
   struct stat buf;
   if (stat(p.begin(), &buf) != 0) {
-    if (errno != errc::no_such_file_or_directory)
+    if (errno != errc::no_such_file_or_directory || !IgnoreNonExisting)
       return error_code(errno, system_category());
-    existed = false;
     return error_code::success();
   }
 
@@ -381,11 +377,9 @@ error_code remove(const Twine &path, bool &existed) {
     return make_error_code(errc::operation_not_permitted);
 
   if (::remove(p.begin()) == -1) {
-    if (errno != errc::no_such_file_or_directory)
+    if (errno != errc::no_such_file_or_directory || !IgnoreNonExisting)
       return error_code(errno, system_category());
-    existed = false;
-  } else
-    existed = true;
+  }
 
   return error_code::success();
 }
diff --git a/lib/Support/Windows/Path.inc b/lib/Support/Windows/Path.inc
index fa7d18a711..f3c7ba1a24 100644
--- a/lib/Support/Windows/Path.inc
+++ b/lib/Support/Windows/Path.inc
@@ -264,7 +264,7 @@ error_code current_path(SmallVectorImpl<char> &result) {
   return UTF16ToUTF8(cur_path.begin(), cur_path.size(), result);
 }
 
-error_code create_directory(const Twine &path, bool &existed) {
+error_code create_directory(const Twine &path, bool IgnoreExisting) {
   SmallString<128> path_storage;
   SmallVector<wchar_t, 128> path_utf16;
 
@@ -274,12 +274,9 @@ error_code create_directory(const Twine &path, bool &existed) {
 
   if (!::CreateDirectoryW(path_utf16.begin(), NULL)) {
     error_code ec = windows_error(::GetLastError());
-    if (ec == windows_error::already_exists)
-      existed = true;
-    else
+    if (ec != windows_error::already_exists || !IgnoreExisting)
       return ec;
-  } else
-    existed = false;
+  }
 
   return error_code::success();
 }
@@ -303,43 +300,34 @@ error_code create_hard_link(const Twine &to, const Twine &from) {
   return error_code::success();
 }
 
-error_code remove(const Twine &path, bool &existed) {
+error_code remove(const Twine &path, bool IgnoreNonExisting) {
   SmallString<128> path_storage;
   SmallVector<wchar_t, 128> path_utf16;
 
-  file_status st;
-  error_code EC = status(path, st);
-  if (EC) {
-    if (EC == windows_error::file_not_found ||
-        EC == windows_error::path_not_found) {
-      existed = false;
-      return error_code::success();
-    }
-    return EC;
+  file_status ST;
+  if (error_code EC = status(path, ST)) {
+    if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
+      return EC;
+    return error_code::success();
   }
 
   if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage),
                                   path_utf16))
     return ec;
 
-  if (st.type() == file_type::directory_file) {
+  if (ST.type() == file_type::directory_file) {
     if (!::RemoveDirectoryW(c_str(path_utf16))) {
-      error_code ec = windows_error(::GetLastError());
-      if (ec != windows_error::file_not_found)
-        return ec;
-      existed = false;
-    } else
-      existed = true;
-  } else {
-    if (!::DeleteFileW(c_str(path_utf16))) {
-      error_code ec = windows_error(::GetLastError());
-      if (ec != windows_error::file_not_found)
-        return ec;
-      existed = false;
-    } else
-      existed = true;
+      error_code EC = windows_error(::GetLastError());
+      if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
+        return EC;
+    }
+    return error_code::success();
+  }
+  if (!::DeleteFileW(c_str(path_utf16))) {
+    error_code EC = windows_error(::GetLastError());
+    if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
+      return EC;
   }
-
   return error_code::success();
 }