[SystemZ][z/OS] Refactor AutoConvert more (#143955)

This patch removes the C++
disablezOSAutoConversion,enablezOSAutoConversion declarations and also
updates Path.inc to use the common function.

Author: abhina-sree

llvm/include/llvm/Support/AutoConvert.h

@@ -18,7 +18,7 @@
 #include <_Ccsid.h>
 #endif
 #ifdef __cplusplus
-#include "llvm/Support/ErrorOr.h"
+#include "llvm/Support/Error.h"
 #include <system_error>
 #endif /* __cplusplus */
 
@@ -41,6 +41,21 @@ int restorezOSStdHandleAutoConversion(int FD);
 #ifdef __cplusplus
 namespace llvm {
 
+#ifdef __MVS__
+
+/** \brief Set the tag information for a file descriptor. */
+std::error_code setzOSFileTag(int FD, int CCSID, bool Text);
+
+/** \brief Get the the tag ccsid for a file name or a file descriptor. */
+ErrorOr<__ccsid_t> getzOSFileTag(const char *FileName, const int FD = -1);
+
+/** \brief Query the file tag to determine if it needs conversion to UTF-8
+ *  codepage.
+ */
+ErrorOr<bool> needzOSConversion(const char *FileName, const int FD = -1);
+
+#endif /* __MVS__*/
+
 inline std::error_code disableAutoConversion(int FD) {
 #ifdef __MVS__
   if (::disablezOSAutoConversion(FD) == -1)
@@ -79,34 +94,6 @@ inline ErrorOr<bool> needConversion(const char *FileName, const int FD = -1) {
   return false;
 }
 
-#ifdef __MVS__
-
-/** \brief Disable the z/OS enhanced ASCII auto-conversion for the file
- * descriptor.
- */
-std::error_code disablezOSAutoConversion(int FD);
-
-/** \brief Query the z/OS enhanced ASCII auto-conversion status of a file
- * descriptor and force the conversion if the file is not tagged with a
- * codepage.
- */
-std::error_code enablezOSAutoConversion(int FD);
-
-/** Restore the z/OS enhanced ASCII auto-conversion for the std handle. */
-std::error_code restorezOSStdHandleAutoConversion(int FD);
-
-/** \brief Set the tag information for a file descriptor. */
-std::error_code setzOSFileTag(int FD, int CCSID, bool Text);
-
-/** \brief Get the the tag ccsid for a file name or a file descriptor. */
-ErrorOr<__ccsid_t> getzOSFileTag(const char *FileName, const int FD = -1);
-
-/** \brief Query the file tag to determine if it needs conversion to UTF-8
- *  codepage.
- */
-ErrorOr<bool> needzOSConversion(const char *FileName, const int FD = -1);
-
-#endif /* __MVS__*/
 } /* namespace llvm */
 #endif /* __cplusplus */
 

llvm/lib/Support/AutoConvert.cpp

@@ -14,7 +14,6 @@
 #ifdef __MVS__
 
 #include "llvm/Support/AutoConvert.h"
-#include "llvm/Support/Error.h"
 #include <cassert>
 #include <fcntl.h>
 #include <sys/stat.h>

llvm/lib/Support/Unix/Path.inc

@@ -1097,14 +1097,14 @@ std::error_code openFile(const Twine &Name, int &ResultFD,
                     !Stat.st_tag.ft_txtflag && !Stat.st_tag.ft_ccsid &&
                     Stat.st_size == 0;
     if (Flags & OF_Text) {
-      if (auto EC = llvm::enablezOSAutoConversion(ResultFD))
+      if (auto EC = llvm::enableAutoConversion(ResultFD))
         return EC;
       if (DoSetTag) {
         if (auto EC = llvm::setzOSFileTag(ResultFD, CCSID_IBM_1047, true))
           return EC;
       }
     } else {
-      if (auto EC = llvm::disablezOSAutoConversion(ResultFD))
+      if (auto EC = llvm::disableAutoConversion(ResultFD))
         return EC;
       if (DoSetTag) {
         if (auto EC = llvm::setzOSFileTag(ResultFD, FT_BINARY, false))

llvm/lib/Support/Unix/Program.inc

@@ -516,7 +516,7 @@ std::error_code llvm::sys::ChangeStdoutMode(fs::OpenFlags Flags) {
 
 std::error_code llvm::sys::ChangeStdinToBinary() {
 #ifdef __MVS__
-  return disablezOSAutoConversion(STDIN_FILENO);
+  return disableAutoConversion(STDIN_FILENO);
 #else
   // Do nothing, as Unix doesn't differentiate between text and binary.
   return std::error_code();