[llvm-commits] CVS: llvm/lib/Support/SlowOperationInformer.cpp
Chris Lattner
lattner at cs.uiuc.edu
Tue Dec 30 23:41:01 PST 2003
Changes in directory llvm/lib/Support:
SlowOperationInformer.cpp added (r1.1)
---
Log message:
New class, useful for command-line interactive programs.
---
Diffs of the changes: (+94 -0)
Index: llvm/lib/Support/SlowOperationInformer.cpp
diff -c /dev/null llvm/lib/Support/SlowOperationInformer.cpp:1.1
*** /dev/null Tue Dec 30 23:40:12 2003
--- llvm/lib/Support/SlowOperationInformer.cpp Tue Dec 30 23:40:02 2003
***************
*** 0 ****
--- 1,94 ----
+ //===-- 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 "Support/SlowOperationInformer.h"
+ #include "Config/config.h" // Get the signal handler return type
+ #include <iostream>
+ #include <sstream>
+ #include <signal.h>
+ #include <unistd.h>
+ using namespace llvm;
+
+ /// OperationCancelled - This flag is set by the SIGINT signal handler if the
+ /// user presses CTRL-C.
+ static volatile bool OperationCancelled;
+
+ /// ShouldShowStatus - This flag gets set if the operation takes a long time.
+ ///
+ static volatile bool ShouldShowStatus;
+
+ /// NestedSOI - Sanity check. SlowOperationInformers cannot be nested or run in
+ /// parallel. This ensures that they never do.
+ static bool NestedSOI = false;
+
+ static RETSIGTYPE SigIntHandler(int Sig) {
+ OperationCancelled = true;
+ signal(SIGINT, SigIntHandler);
+ }
+
+ static RETSIGTYPE SigAlarmHandler(int Sig) {
+ ShouldShowStatus = true;
+ }
+
+ static sighandler_t OldSigIntHandler;
+
+
+ SlowOperationInformer::SlowOperationInformer(const std::string &Name)
+ : OperationName(Name), LastPrintAmount(0) {
+ assert(!NestedSOI && "SlowerOperationInformer objects cannot be nested!");
+ NestedSOI = true;
+
+ OperationCancelled = 0;
+ ShouldShowStatus = 0;
+
+ signal(SIGALRM, SigAlarmHandler);
+ OldSigIntHandler = signal(SIGINT, SigIntHandler);
+ alarm(1);
+ }
+
+ SlowOperationInformer::~SlowOperationInformer() {
+ NestedSOI = false;
+ if (LastPrintAmount)
+ std::cout << "\n";
+
+ alarm(0);
+ signal(SIGALRM, SIG_DFL);
+ signal(SIGINT, OldSigIntHandler);
+ }
+
+ /// 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) {
+ if (OperationCancelled) {
+ 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 (!ShouldShowStatus)
+ return;
+
+ // Delete whatever we printed last time.
+ std::string ToPrint = std::string(LastPrintAmount, '\b');
+
+ std::ostringstream OS;
+ OS << "Progress " << OperationName << ": " << Amount/10 << "." << Amount % 10
+ << "%";
+
+ LastPrintAmount = OS.str().size();
+ std::cout << ToPrint+OS.str() << std::flush;
+ }
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