| //===-- 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; |
| } |