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//===-- 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/Streams.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.
cout << 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) {
cout << "\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();
cout << ToPrint+OS.str() << std::flush;
return false;
}
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