Use std::error_code instead of llvm::error_code.
The idea of this patch is to turn llvm/Support/system_error.h into a
transitional header that just brings in the erorr_code api to the llvm
namespace. I will remove it shortly afterwards.
The cases where the general idea needed some tweaking:
* std::errc is a namespace in msvc, so we cannot use "using std::errc". I could
add an #ifdef, but there were not that many uses, so I just added std:: to
them in this patch.
* Template specialization had to be moved to the std namespace in this
patch set already.
* The msvc implementation of default_error_condition doesn't seem to
provide the same transformations as we need. Not too surprising since
the standard doesn't actually say what "equivalent" means. I fixed the
problem by keeping our old mapping and using it at error_code
construction time.
Despite these shortcomings I think this is still a good thing. Some reasons:
* The different implementations of system_error might improve over time.
* It removes 925 lines of code from llvm already.
* It removes 6313 bytes from the text segment of the clang binary when
it is built with gcc and 2816 bytes when building with clang and
libstdc++.
llvm-svn: 210687
diff --git a/llvm/lib/Support/WindowsError.cpp b/llvm/lib/Support/WindowsError.cpp
new file mode 100644
index 0000000..59c575f
--- /dev/null
+++ b/llvm/lib/Support/WindowsError.cpp
@@ -0,0 +1,115 @@
+//===-- WindowsError.cpp - Support for mapping windows errors to posix-----===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements a mapping from windows errors to posix ones.
+// The standard doesn't define what the equivalence is from system
+// errors to generic ones. The one implemented in msvc is too conservative
+// for llvm, so we do an extra mapping when constructing an error_code
+// from an windows error. This allows the rest of llvm to simple checks
+// like "EC == std::errc::file_exists" and have it work on both posix and
+// windows.
+//
+//===----------------------------------------------------------------------===//
+
+#ifdef _MSC_VER
+
+#include <winerror.h>
+
+#include "llvm/Support/WindowsError.h"
+
+// I'd rather not double the line count of the following.
+#define MAP_ERR_TO_COND(x, y) \
+ case x: \
+ return std::make_error_code(std::errc::y)
+
+std::error_code llvm::mapWindowsError(unsigned EV) {
+ switch (EV) {
+ 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_HANDLE_EOF, value_too_large);
+ 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_BAD_NETPATH, 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 std::error_code(EV, std::system_category());
+ }
+}
+
+#endif