1 files changed, 67 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Support/SlowOperationInformer.cpp b/contrib/llvm/lib/Support/SlowOperationInformer.cpp
new file mode 100644
index 0000000..b4e9430
--- /dev/null
+++ b/contrib/llvm/lib/Support/SlowOperationInformer.cpp
@@ -0,0 +1,67 @@
+//===-- SlowOperationInformer.cpp - Keep the user informed ----------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the SlowOperationInformer class for the LLVM debugger.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/SlowOperationInformer.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/System/Alarm.h"
+#include <sstream>
+#include <cassert>
+using namespace llvm;
+
+SlowOperationInformer::SlowOperationInformer(const std::string &Name)
+  : OperationName(Name), LastPrintAmount(0) {
+  sys::SetupAlarm(1);
+}
+
+SlowOperationInformer::~SlowOperationInformer() {
+  sys::TerminateAlarm();
+  if (LastPrintAmount) {
+    // If we have printed something, make _sure_ we print the 100% amount, and
+    // also print a newline.
+    outs() << std::string(LastPrintAmount, '\b') << "Progress "
+           << OperationName << ": 100%  \n";
+  }
+}
+
+/// progress - Clients should periodically call this method when they are in
+/// an exception-safe state.  The Amount variable should indicate how far
+/// along the operation is, given in 1/10ths of a percent (in other words,
+/// Amount should range from 0 to 1000).
+bool SlowOperationInformer::progress(unsigned Amount) {
+  int status = sys::AlarmStatus();
+  if (status == -1) {
+    outs() << "\n";
+    LastPrintAmount = 0;
+    return true;
+  }
+
+  // If we haven't spent enough time in this operation to warrant displaying the
+  // progress bar, don't do so yet.
+  if (status == 0)
+    return false;
+
+  // Delete whatever we printed last time.
+  std::string ToPrint = std::string(LastPrintAmount, '\b');
+
+  std::ostringstream OS;
+  OS << "Progress " << OperationName << ": " << Amount/10;
+  if (unsigned Rem = Amount % 10)
+    OS << "." << Rem << "%";
+  else
+    OS << "%  ";
+
+  LastPrintAmount = OS.str().size();
+  outs() << ToPrint+OS.str();
+  outs().flush();
+  return false;
+}