[Support] Fix up comments.

[oota-llvm.git] / lib / Support / ErrorHandling.cpp

diff --git a/lib/Support/ErrorHandling.cpp b/lib/Support/ErrorHandling.cpp
index 56a171cb7d374d37d0f6ae74b03ab0d4c3170474..e6cc57db8243506c7a18067e6109dd4c7485d2fd 100644 (file)
--- a/lib/Support/ErrorHandling.cpp
+++ b/lib/Support/ErrorHandling.cpp
@@ -16,11 +16,22 @@
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/raw_ostream.h"
-#include "llvm/System/Threading.h"
+#include "llvm/Support/Signals.h"
+#include "llvm/Support/Threading.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/Config/config.h"
 #include <cassert>
 #include <cstdlib>
+
+#if defined(HAVE_UNISTD_H)
+# include <unistd.h>
+#endif
+#if defined(_MSC_VER)
+# include <io.h>
+# include <fcntl.h>
+#endif
+
 using namespace llvm;
-using namespace std;
 
 static fatal_error_handler_t ErrorHandler = 0;
 static void *ErrorHandlerUserData = 0;
@@ -38,20 +49,38 @@ void llvm::remove_fatal_error_handler() {
   ErrorHandler = 0;
 }
 
-void llvm::report_fatal_error(const char *reason) {
-  report_fatal_error(Twine(reason));
+void llvm::report_fatal_error(const char *Reason) {
+  report_fatal_error(Twine(Reason));
+}
+
+void llvm::report_fatal_error(const std::string &Reason) {
+  report_fatal_error(Twine(Reason));
 }
 
-void llvm::report_fatal_error(const std::string &reason) {
-  report_fatal_error(Twine(reason));
+void llvm::report_fatal_error(StringRef Reason) {
+  report_fatal_error(Twine(Reason));
 }
 
-void llvm::report_fatal_error(const Twine &reason) {
-  if (!ErrorHandler) {
-    errs() << "LLVM ERROR: " << reason << "\n";
+void llvm::report_fatal_error(const Twine &Reason) {
+  if (ErrorHandler) {
+    ErrorHandler(ErrorHandlerUserData, Reason.str());
   } else {
-    ErrorHandler(ErrorHandlerUserData, reason.str());
+    // 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
+    // raw ostreams can call report_fatal_error.
+    SmallVector<char, 64> Buffer;
+    raw_svector_ostream OS(Buffer);
+    OS << "LLVM ERROR: " << Reason << "\n";
+    StringRef MessageStr = OS.str();
+    ssize_t written = ::write(2, MessageStr.data(), MessageStr.size());
+    (void)written; // If something went wrong, we deliberately just give up.
   }
+
+  // If we reached here, we are failing ungracefully. Run the interrupt handlers
+  // to make sure any special cleanups get done, in particular that we remove
+  // files registered with RemoveFileOnSignal.
+  sys::RunInterruptHandlers();
+
   exit(1);
 }