[Windows] Fix assertion failure when passing 'nul' in input to clang.

Before this patch, if 'nul' was passed in input to clang, function
getStatus() (in Path.inc) always returned an instance of file_status with
field 'nFileSizeHigh' and 'nFileSizeLow' left uninitialized.

This was causing the triggering of an assertion failure in MemoryBuffer.cpp due
to an invalid FileSize for device 'nul'.

This patch fixes the assertion failure modifying the constructors of class
file_status (in llvm/Support/FileSystem.h) so that every field of the class
gets initialized to zero by default.

A clang test will be submitted on a separate patch.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207575 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/Support/FileSystem.h b/include/llvm/Support/FileSystem.h
index b2a06770825f6319428286caf4b5138cbfbc8a0a..a92645c98670fbc8226327e3bd583f933e039bb5 100644 (file)
--- a/include/llvm/Support/FileSystem.h
+++ b/include/llvm/Support/FileSystem.h
@@ -165,15 +165,30 @@ class file_status
   file_type Type;
   perms Perms;
 public:
-  file_status() : Type(file_type::status_error) {}
-  file_status(file_type Type) : Type(Type) {}
-
   #if defined(LLVM_ON_UNIX)
+    file_status() : fs_st_dev(0), fs_st_ino(0), fs_st_mtime(0),
+        fs_st_uid(0), fs_st_gid(0), fs_st_size(0),
+        Type(file_type::status_error), Perms(perms_not_known) {}
+
+    file_status(file_type Type) : fs_st_dev(0), fs_st_ino(0), fs_st_mtime(0),
+        fs_st_uid(0), fs_st_gid(0), fs_st_size(0), Type(Type),
+        Perms(perms_not_known) {}
+
     file_status(file_type Type, perms Perms, dev_t Dev, ino_t Ino, time_t MTime,
                 uid_t UID, gid_t GID, off_t Size)
         : fs_st_dev(Dev), fs_st_ino(Ino), fs_st_mtime(MTime), fs_st_uid(UID),
           fs_st_gid(GID), fs_st_size(Size), Type(Type), Perms(Perms) {}
   #elif defined(LLVM_ON_WIN32)
+    file_status() : LastWriteTimeHigh(0), LastWriteTimeLow(0),
+        VolumeSerialNumber(0), FileSizeHigh(0), FileSizeLow(0),
+        FileIndexHigh(0), FileIndexLow(0), Type(file_type::status_error),
+        Perms(perms_not_known) {}
+
+    file_status(file_type Type) : LastWriteTimeHigh(0), LastWriteTimeLow(0),
+        VolumeSerialNumber(0), FileSizeHigh(0), FileSizeLow(0),
+        FileIndexHigh(0), FileIndexLow(0), Type(Type),
+        Perms(perms_not_known) {}
+
     file_status(file_type Type, uint32_t LastWriteTimeHigh,
                 uint32_t LastWriteTimeLow, uint32_t VolumeSerialNumber,
                 uint32_t FileSizeHigh, uint32_t FileSizeLow,