Update LLVM for rebase to r212749.

Includes a cherry-pick of:
r212948 - fixes a small issue with atomic calls

Change-Id: Ib97bd980b59f18142a69506400911a6009d9df18

1 files changed, 88 insertions, 4 deletions

diff --git a/lib/Support/ErrorHandling.cpp b/lib/Support/ErrorHandling.cpp
index 342c4f0..c36007f 100644
--- a/lib/Support/ErrorHandling.cpp
+++ b/lib/Support/ErrorHandling.cpp
@@ -18,8 +18,12 @@
 #include "llvm/ADT/Twine.h"
 #include "llvm/Config/config.h"
 #include "llvm/Support/Debug.h"
+#include "llvm/Support/Errc.h"
 #include "llvm/Support/Signals.h"
+#include "llvm/Support/Mutex.h"
+#include "llvm/Support/MutexGuard.h"
 #include "llvm/Support/Threading.h"
+#include "llvm/Support/WindowsError.h"
 #include "llvm/Support/raw_ostream.h"
 #include <cassert>
 #include <cstdlib>
@@ -37,17 +41,20 @@ using namespace llvm;
 static fatal_error_handler_t ErrorHandler = nullptr;
 static void *ErrorHandlerUserData = nullptr;
 
+static sys::Mutex ErrorHandlerMutex;
+
 void llvm::install_fatal_error_handler(fatal_error_handler_t handler,
                                        void *user_data) {
-  assert(!llvm_is_multithreaded() &&
-         "Cannot register error handlers after starting multithreaded mode!\n");
+  llvm::MutexGuard Lock(ErrorHandlerMutex);
   assert(!ErrorHandler && "Error handler already registered!\n");
   ErrorHandler = handler;
   ErrorHandlerUserData = user_data;
 }
 
 void llvm::remove_fatal_error_handler() {
+  llvm::MutexGuard Lock(ErrorHandlerMutex);
   ErrorHandler = nullptr;
+  ErrorHandlerUserData = nullptr;
 }
 
 void llvm::report_fatal_error(const char *Reason, bool GenCrashDiag) {
@@ -63,8 +70,18 @@ void llvm::report_fatal_error(StringRef Reason, bool GenCrashDiag) {
 }
 
 void llvm::report_fatal_error(const Twine &Reason, bool GenCrashDiag) {
-  if (ErrorHandler) {
-    ErrorHandler(ErrorHandlerUserData, Reason.str(), GenCrashDiag);
+  llvm::fatal_error_handler_t handler = nullptr;
+  void* handlerData = nullptr;
+  {
+    // Only acquire the mutex while reading the handler, so as not to invoke a
+    // user-supplied callback under a lock.
+    llvm::MutexGuard Lock(ErrorHandlerMutex);
+    handler = ErrorHandler;
+    handlerData = ErrorHandlerUserData;
+  }
+
+  if (handler) {
+    handler(handlerData, Reason.str(), GenCrashDiag);
   } else {
     // Blast the result out to stderr.  We don't try hard to make sure this
     // succeeds (e.g. handling EINTR) and we can't use errs() here because
@@ -119,3 +136,70 @@ void LLVMInstallFatalErrorHandler(LLVMFatalErrorHandler Handler) {
 void LLVMResetFatalErrorHandler() {
   remove_fatal_error_handler();
 }
+
+#ifdef LLVM_ON_WIN32
+
+#include <winerror.h>
+
+// I'd rather not double the line count of the following.
+#define MAP_ERR_TO_COND(x, y)                                                  \
+  case x:                                                                      \
+    return make_error_code(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_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_OPEN_FAILED, io_error);
+    MAP_ERR_TO_COND(ERROR_OPEN_FILES, device_or_resource_busy);
+    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(WSAEACCES, permission_denied);
+    MAP_ERR_TO_COND(WSAEBADF, bad_file_descriptor);
+    MAP_ERR_TO_COND(WSAEFAULT, bad_address);
+    MAP_ERR_TO_COND(WSAEINTR, interrupted);
+    MAP_ERR_TO_COND(WSAEINVAL, invalid_argument);
+    MAP_ERR_TO_COND(WSAEMFILE, too_many_files_open);
+    MAP_ERR_TO_COND(WSAENAMETOOLONG, filename_too_long);
+  default:
+    return std::error_code(EV, std::system_category());
+  }
+}
+
+#endif