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[llvm/msp430.git] / lib / Support / SlowOperationInformer.cpp
blobd5ffff9d937fcde152e00f57c7032b38f531f28f
1 //===-- SlowOperationInformer.cpp - Keep the user informed ----------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the SlowOperationInformer class for the LLVM debugger.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Support/SlowOperationInformer.h"
15 #include "llvm/Support/Streams.h"
16 #include "llvm/System/Alarm.h"
17 #include <sstream>
18 #include <cassert>
19 using namespace llvm;
21 SlowOperationInformer::SlowOperationInformer(const std::string &Name)
22 : OperationName(Name), LastPrintAmount(0) {
23 sys::SetupAlarm(1);
26 SlowOperationInformer::~SlowOperationInformer() {
27 sys::TerminateAlarm();
28 if (LastPrintAmount) {
29 // If we have printed something, make _sure_ we print the 100% amount, and
30 // also print a newline.
31 cout << std::string(LastPrintAmount, '\b') << "Progress "
32 << OperationName << ": 100% \n";
36 /// progress - Clients should periodically call this method when they are in
37 /// an exception-safe state. The Amount variable should indicate how far
38 /// along the operation is, given in 1/10ths of a percent (in other words,
39 /// Amount should range from 0 to 1000).
40 bool SlowOperationInformer::progress(unsigned Amount) {
41 int status = sys::AlarmStatus();
42 if (status == -1) {
43 cout << "\n";
44 LastPrintAmount = 0;
45 return true;
48 // If we haven't spent enough time in this operation to warrant displaying the
49 // progress bar, don't do so yet.
50 if (status == 0)
51 return false;
53 // Delete whatever we printed last time.
54 std::string ToPrint = std::string(LastPrintAmount, '\b');
56 std::ostringstream OS;
57 OS << "Progress " << OperationName << ": " << Amount/10;
58 if (unsigned Rem = Amount % 10)
59 OS << "." << Rem << "%";
60 else
61 OS << "% ";
63 LastPrintAmount = OS.str().size();
64 cout << ToPrint+OS.str() << std::flush;
65 return false;