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now cerr, cout, and NullStream resp. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32298 91177308-0d34-0410-b5e6-96231b3b80d8
67 lines
2.1 KiB
C++
67 lines
2.1 KiB
C++
//===-- SlowOperationInformer.cpp - Keep the user informed ----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the SlowOperationInformer class for the LLVM debugger.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/SlowOperationInformer.h"
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#include "llvm/Support/Streams.h"
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#include "llvm/System/Alarm.h"
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#include <sstream>
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#include <cassert>
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using namespace llvm;
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SlowOperationInformer::SlowOperationInformer(const std::string &Name)
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: OperationName(Name), LastPrintAmount(0) {
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sys::SetupAlarm(1);
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}
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SlowOperationInformer::~SlowOperationInformer() {
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sys::TerminateAlarm();
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if (LastPrintAmount) {
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// If we have printed something, make _sure_ we print the 100% amount, and
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// also print a newline.
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cout << std::string(LastPrintAmount, '\b') << "Progress "
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<< OperationName << ": 100% \n";
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}
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}
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/// progress - Clients should periodically call this method when they are in
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/// an exception-safe state. The Amount variable should indicate how far
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/// along the operation is, given in 1/10ths of a percent (in other words,
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/// Amount should range from 0 to 1000).
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bool SlowOperationInformer::progress(unsigned Amount) {
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int status = sys::AlarmStatus();
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if (status == -1) {
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cout << "\n";
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LastPrintAmount = 0;
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return true;
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}
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// If we haven't spent enough time in this operation to warrant displaying the
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// progress bar, don't do so yet.
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if (status == 0)
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return false;
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// Delete whatever we printed last time.
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std::string ToPrint = std::string(LastPrintAmount, '\b');
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std::ostringstream OS;
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OS << "Progress " << OperationName << ": " << Amount/10;
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if (unsigned Rem = Amount % 10)
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OS << "." << Rem << "%";
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else
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OS << "% ";
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LastPrintAmount = OS.str().size();
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cout << ToPrint+OS.str() << std::flush;
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return false;
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}
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