Support/FileSystem: Implement canonicalize.

llvm-svn: 146363

3 files changed, 65 insertions, 0 deletions

diff --git a/llvm/lib/Support/Unix/PathV2.inc b/llvm/lib/Support/Unix/PathV2.inc
index 7477b4f2a08..41ed49fec7d 100644
--- a/llvm/lib/Support/Unix/PathV2.inc
+++ b/llvm/lib/Support/Unix/PathV2.inc
@@ -439,6 +439,13 @@ rety_open_create:
   return success;
 }
 
+error_code canonicalize(const Twine &path, SmallVectorImpl<char> &result) {
+  // Paths are already canonicalized on posix systems.
+  assert(path::is_absolute(path) && "path must be absolute!");
+  path.toVector(result);
+  return success;
+}
+
 error_code detail::directory_iterator_construct(detail::DirIterState &it,
                                                 StringRef path){
   SmallString<128> path_null(path);
diff --git a/llvm/lib/Support/Windows/PathV2.inc b/llvm/lib/Support/Windows/PathV2.inc
index afb5533dc82..abb53c2ce18 100644
--- a/llvm/lib/Support/Windows/PathV2.inc
+++ b/llvm/lib/Support/Windows/PathV2.inc
@@ -638,6 +638,44 @@ retry_create_file:
   return success;
 }
 
+error_code canonicalize(const Twine &path, SmallVectorImpl<char> &result) {
+  assert(path::is_absolute(path) && "path must be absolute!");
+  SmallString<128> path_storage;
+  StringRef p = path.toStringRef(path_storage);
+  SmallVector<wchar_t, 128> path_utf16;
+  result.set_size(0);
+
+  // Convert path to UTF-16.
+  if (error_code ec = UTF8ToUTF16(p, path_utf16))
+    return ec;
+
+  DWORD size = ::GetShortPathNameW(c_str(path_utf16), NULL, 0);
+  SmallVector<wchar_t, 128> short_path;
+  short_path.reserve(size + 1);
+  size = ::GetShortPathNameW( c_str(path_utf16)
+                            , short_path.data()
+                            , short_path.capacity());
+  if (!size)
+    return windows_error(::GetLastError());
+
+  short_path.set_size(size);
+
+  size = ::GetLongPathNameW(c_str(short_path), NULL, 0);
+  path_utf16.reserve(size + 1);
+  size = ::GetLongPathNameW( c_str(short_path)
+                           , path_utf16.data()
+                           , path_utf16.capacity());
+  if (!size)
+    return windows_error(::GetLastError());
+
+  path_utf16.set_size(size);
+
+  if (error_code ec = UTF16ToUTF8(path_utf16.data(), path_utf16.size(), result))
+    return ec;
+
+  return success;
+}
+
 error_code get_magic(const Twine &path, uint32_t len,
                      SmallVectorImpl<char> &result) {
   SmallString<128> path_storage;
diff --git a/llvm/lib/Support/Windows/Windows.h b/llvm/lib/Support/Windows/Windows.h
index 5c1da0d617a..27540750355 100644
--- a/llvm/lib/Support/Windows/Windows.h
+++ b/llvm/lib/Support/Windows/Windows.h
@@ -128,6 +128,24 @@ struct FindHandleTraits : CommonHandleTraits {
   }
 };
 
+struct FileMappingHandleTraits : CommonHandleTraits {
+  static handle_type GetInvalid() {
+    return 0;
+  }
+};
+
+struct MappedViewOfFileHandleTraits : CommonHandleTraits {
+  typedef LPVOID handle_type;
+
+  static handle_type GetInvalid() {
+    return 0;
+  }
+
+  static void Close(handle_type h) {
+    ::UnmapViewOfFile(h);
+  }
+};
+
 struct FileHandleTraits : CommonHandleTraits {};
 
 typedef ScopedHandle<CommonHandleTraits> ScopedCommonHandle;
@@ -135,6 +153,8 @@ typedef ScopedHandle<FileHandleTraits>   ScopedFileHandle;
 typedef ScopedHandle<CryptContextTraits> ScopedCryptContext;
 typedef ScopedHandle<FindHandleTraits>   ScopedFindHandle;
 typedef ScopedHandle<JobHandleTraits>    ScopedJobHandle;
+typedef ScopedHandle<FileMappingHandleTraits> ScopedFileMappingHandle;
+typedef ScopedHandle<MappedViewOfFileHandleTraits> ScopedMappedViewOfFileHandle;
 
 namespace llvm {
 template <class T>