//===-- SlowOperationInformer.cpp - Keep the user informed ----------------===// // // The LLVM Compiler Infrastructure // // This file was developed by the LLVM research group and 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/System/Alarm.h" #include <iostream> #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. std::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). void SlowOperationInformer::progress(unsigned Amount) { int status = sys::AlarmStatus(); if (status == -1) { std::cout << "\n"; LastPrintAmount = 0; throw "While " + OperationName + ", operation cancelled."; } // 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; // 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(); std::cout << ToPrint+OS.str() << std::flush; }