This is the first step in adding sane error handling support to LLVMSystem.

The system API's will be shifted over to returning an error_code, and returning
other return values as out parameters to the function.

Code that needs to check error conditions will use the errc enum values which
are the same as the posix_errno defines (EBADF, E2BIG, etc...), and are
compatable with the error codes in WinError.h due to some magic in system_error.

An example would be:

if (error_code ec = KillEvil("Java")) { // error_code can be converted to bool.
  handle_error(ec);
}

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119360 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 140 insertions, 0 deletions

diff --git a/lib/System/Win32/system_error.inc b/lib/System/Win32/system_error.inc
new file mode 100644
index 0000000000..db02582899
--- /dev/null
+++ b/lib/System/Win32/system_error.inc
@@ -0,0 +1,140 @@
+//===- llvm/System/Win32/system_error.inc - Windows error_code --*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file provides the Windows specific implementation of the error_code
+// and error_condition classes.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only generic Windows code that
+//===          is guaranteed to work on *all* Windows variants.
+//===----------------------------------------------------------------------===//
+
+#include <Windows.h>
+#include <WinError.h>
+
+using namespace llvm;
+
+std::string
+_system_error_category::message(int ev) const {
+  LPVOID lpMsgBuf = 0;
+  DWORD retval = ::FormatMessageA(
+    FORMAT_MESSAGE_ALLOCATE_BUFFER |
+    FORMAT_MESSAGE_FROM_SYSTEM |
+    FORMAT_MESSAGE_IGNORE_INSERTS,
+    NULL,
+    ev,
+    MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
+    (LPSTR) &lpMsgBuf,
+    0,
+    NULL);
+  if (retval == 0) {
+    ::LocalFree(lpMsgBuf);
+    return std::string("Unknown error");
+  }
+
+  std::string str( static_cast<LPCSTR>(lpMsgBuf) );
+  ::LocalFree(lpMsgBuf);
+
+  while (str.size()
+     && (str[str.size()-1] == '\n' || str[str.size()-1] == '\r'))
+    str.erase( str.size()-1 );
+  if (str.size() && str[str.size()-1] == '.')
+    str.erase( str.size()-1 );
+  return str;
+}
+
+// I'd rather not double the line count of the following.
+#define MAP_ERR_TO_COND(x, y) case x: return make_error_condition(errc::y)
+
+error_condition
+_system_error_category::default_error_condition(int ev) const {
+  switch (ev) {
+  MAP_ERR_TO_COND(0, success);
+  // Windows system -> posix_errno decode table  ---------------------------//
+  // see WinError.h comments for descriptions of errors
+  MAP_ERR_TO_COND(ERROR_ACCESS_DENIED,       permission_denied);
+  MAP_ERR_TO_COND(ERROR_ALREADY_EXISTS,      file_exists);
+  MAP_ERR_TO_COND(ERROR_BAD_UNIT,            no_such_device);
+  MAP_ERR_TO_COND(ERROR_BUFFER_OVERFLOW,     filename_too_long);
+  MAP_ERR_TO_COND(ERROR_BUSY,                device_or_resource_busy);
+  MAP_ERR_TO_COND(ERROR_BUSY_DRIVE,          device_or_resource_busy);
+  MAP_ERR_TO_COND(ERROR_CANNOT_MAKE,         permission_denied);
+  MAP_ERR_TO_COND(ERROR_CANTOPEN,            io_error);
+  MAP_ERR_TO_COND(ERROR_CANTREAD,            io_error);
+  MAP_ERR_TO_COND(ERROR_CANTWRITE,           io_error);
+  MAP_ERR_TO_COND(ERROR_CURRENT_DIRECTORY,   permission_denied);
+  MAP_ERR_TO_COND(ERROR_DEV_NOT_EXIST,       no_such_device);
+  MAP_ERR_TO_COND(ERROR_DEVICE_IN_USE,       device_or_resource_busy);
+  MAP_ERR_TO_COND(ERROR_DIR_NOT_EMPTY,       directory_not_empty);
+  MAP_ERR_TO_COND(ERROR_DIRECTORY,           invalid_argument);
+  MAP_ERR_TO_COND(ERROR_DISK_FULL,           no_space_on_device);
+  MAP_ERR_TO_COND(ERROR_FILE_EXISTS,         file_exists);
+  MAP_ERR_TO_COND(ERROR_FILE_NOT_FOUND,      no_such_file_or_directory);
+  MAP_ERR_TO_COND(ERROR_HANDLE_DISK_FULL,    no_space_on_device);
+  MAP_ERR_TO_COND(ERROR_INVALID_ACCESS,      permission_denied);
+  MAP_ERR_TO_COND(ERROR_INVALID_DRIVE,       no_such_device);
+  MAP_ERR_TO_COND(ERROR_INVALID_FUNCTION,    function_not_supported);
+  MAP_ERR_TO_COND(ERROR_INVALID_HANDLE,      invalid_argument);
+  MAP_ERR_TO_COND(ERROR_INVALID_NAME,        invalid_argument);
+  MAP_ERR_TO_COND(ERROR_LOCK_VIOLATION,      no_lock_available);
+  MAP_ERR_TO_COND(ERROR_LOCKED,              no_lock_available);
+  MAP_ERR_TO_COND(ERROR_NEGATIVE_SEEK,       invalid_argument);
+  MAP_ERR_TO_COND(ERROR_NOACCESS,            permission_denied);
+  MAP_ERR_TO_COND(ERROR_NOT_ENOUGH_MEMORY,   not_enough_memory);
+  MAP_ERR_TO_COND(ERROR_NOT_READY,           resource_unavailable_try_again);
+  MAP_ERR_TO_COND(ERROR_NOT_SAME_DEVICE,     cross_device_link);
+  MAP_ERR_TO_COND(ERROR_OPEN_FAILED,         io_error);
+  MAP_ERR_TO_COND(ERROR_OPEN_FILES,          device_or_resource_busy);
+  MAP_ERR_TO_COND(ERROR_OPERATION_ABORTED,   operation_canceled);
+  MAP_ERR_TO_COND(ERROR_OUTOFMEMORY,         not_enough_memory);
+  MAP_ERR_TO_COND(ERROR_PATH_NOT_FOUND,      no_such_file_or_directory);
+  MAP_ERR_TO_COND(ERROR_READ_FAULT,          io_error);
+  MAP_ERR_TO_COND(ERROR_RETRY,               resource_unavailable_try_again);
+  MAP_ERR_TO_COND(ERROR_SEEK,                io_error);
+  MAP_ERR_TO_COND(ERROR_SHARING_VIOLATION,   permission_denied);
+  MAP_ERR_TO_COND(ERROR_TOO_MANY_OPEN_FILES, too_many_files_open);
+  MAP_ERR_TO_COND(ERROR_WRITE_FAULT,         io_error);
+  MAP_ERR_TO_COND(ERROR_WRITE_PROTECT,       permission_denied);
+  MAP_ERR_TO_COND(ERROR_SEM_TIMEOUT,         timed_out);
+  MAP_ERR_TO_COND(WSAEACCES,                 permission_denied);
+  MAP_ERR_TO_COND(WSAEADDRINUSE,             address_in_use);
+  MAP_ERR_TO_COND(WSAEADDRNOTAVAIL,          address_not_available);
+  MAP_ERR_TO_COND(WSAEAFNOSUPPORT,           address_family_not_supported);
+  MAP_ERR_TO_COND(WSAEALREADY,               connection_already_in_progress);
+  MAP_ERR_TO_COND(WSAEBADF,                  bad_file_descriptor);
+  MAP_ERR_TO_COND(WSAECONNABORTED,           connection_aborted);
+  MAP_ERR_TO_COND(WSAECONNREFUSED,           connection_refused);
+  MAP_ERR_TO_COND(WSAECONNRESET,             connection_reset);
+  MAP_ERR_TO_COND(WSAEDESTADDRREQ,           destination_address_required);
+  MAP_ERR_TO_COND(WSAEFAULT,                 bad_address);
+  MAP_ERR_TO_COND(WSAEHOSTUNREACH,           host_unreachable);
+  MAP_ERR_TO_COND(WSAEINPROGRESS,            operation_in_progress);
+  MAP_ERR_TO_COND(WSAEINTR,                  interrupted);
+  MAP_ERR_TO_COND(WSAEINVAL,                 invalid_argument);
+  MAP_ERR_TO_COND(WSAEISCONN,                already_connected);
+  MAP_ERR_TO_COND(WSAEMFILE,                 too_many_files_open);
+  MAP_ERR_TO_COND(WSAEMSGSIZE,               message_size);
+  MAP_ERR_TO_COND(WSAENAMETOOLONG,           filename_too_long);
+  MAP_ERR_TO_COND(WSAENETDOWN,               network_down);
+  MAP_ERR_TO_COND(WSAENETRESET,              network_reset);
+  MAP_ERR_TO_COND(WSAENETUNREACH,            network_unreachable);
+  MAP_ERR_TO_COND(WSAENOBUFS,                no_buffer_space);
+  MAP_ERR_TO_COND(WSAENOPROTOOPT,            no_protocol_option);
+  MAP_ERR_TO_COND(WSAENOTCONN,               not_connected);
+  MAP_ERR_TO_COND(WSAENOTSOCK,               not_a_socket);
+  MAP_ERR_TO_COND(WSAEOPNOTSUPP,             operation_not_supported);
+  MAP_ERR_TO_COND(WSAEPROTONOSUPPORT,        protocol_not_supported);
+  MAP_ERR_TO_COND(WSAEPROTOTYPE,             wrong_protocol_type);
+  MAP_ERR_TO_COND(WSAETIMEDOUT,              timed_out);
+  MAP_ERR_TO_COND(WSAEWOULDBLOCK,            operation_would_block);
+  default: return error_condition(ev, system_category());
+  }
+}