tools/bugpoint/bugpoint.cpp

   1 //===- bugpoint.cpp - The LLVM Bugpoint utility ---------------------------===//
   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 program is an automated compiler debugger tool.  It is used to narrow
  11 // down miscompilations and crash problems to a specific pass in the compiler,
  12 // and the specific Module or Function input that is causing the problem.
  13 //
  14 //===----------------------------------------------------------------------===//
  15
  16 #include "BugDriver.h"
  17 #include "ToolRunner.h"
  18 #include "llvm/LinkAllPasses.h"
  19 #include "llvm/Support/PassNameParser.h"
  20 #include "llvm/Support/CommandLine.h"
  21 #include "llvm/Support/ManagedStatic.h"
  22 #include "llvm/Support/PluginLoader.h"
  23 #include "llvm/Support/PrettyStackTrace.h"
  24 #include "llvm/System/Process.h"
  25 #include "llvm/System/Signals.h"
  26 #include "llvm/LinkAllVMCore.h"
  27 #include <iostream>
  28 using namespace llvm;
  29
  30 // AsChild - Specifies that this invocation of bugpoint is being generated
  31 // from a parent process. It is not intended to be used by users so the
  32 // option is hidden.
  33 static cl::opt<bool>
  34 AsChild("as-child", cl::desc("Run bugpoint as child process"),
  35         cl::ReallyHidden);
  36
  37 static cl::opt<bool>
  38 FindBugs("find-bugs", cl::desc("Run many different optimization sequences "
  39                                "on program to find bugs"), cl::init(false));
  40
  41 static cl::list<std::string>
  42 InputFilenames(cl::Positional, cl::OneOrMore,
  43                cl::desc("<input llvm ll/bc files>"));
  44
  45 static cl::opt<unsigned>
  46 TimeoutValue("timeout", cl::init(300), cl::value_desc("seconds"),
  47              cl::desc("Number of seconds program is allowed to run before it "
  48                       "is killed (default is 300s), 0 disables timeout"));
  49
  50 static cl::opt<unsigned>
  51 MemoryLimit("mlimit", cl::init(100), cl::value_desc("MBytes"),
  52              cl::desc("Maximum amount of memory to use. 0 disables check."));
  53
  54 // The AnalysesList is automatically populated with registered Passes by the
  55 // PassNameParser.
  56 //
  57 static cl::list<const PassInfo*, bool, PassNameParser>
  58 PassList(cl::desc("Passes available:"), cl::ZeroOrMore);
  59
  60 /// BugpointIsInterrupted - Set to true when the user presses ctrl-c.
  61 bool llvm::BugpointIsInterrupted = false;
  62
  63 static void BugpointInterruptFunction() {
  64   BugpointIsInterrupted = true;
  65 }
  66
  67 int main(int argc, char **argv) {
  68   llvm::sys::PrintStackTraceOnErrorSignal();
  69   llvm::PrettyStackTraceProgram X(argc, argv);
  70   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
  71   cl::ParseCommandLineOptions(argc, argv,
  72                               "LLVM automatic testcase reducer. See\nhttp://"
  73                               "llvm.org/cmds/bugpoint.html"
  74                               " for more information.\n");
  75   sys::SetInterruptFunction(BugpointInterruptFunction);
  76
  77   BugDriver D(argv[0], AsChild, FindBugs, TimeoutValue, MemoryLimit);
  78   if (D.addSources(InputFilenames)) return 1;
  79   D.addPasses(PassList.begin(), PassList.end());
  80
  81   // Bugpoint has the ability of generating a plethora of core files, so to
  82   // avoid filling up the disk, we prevent it
  83   sys::Process::PreventCoreFiles();
  84
  85   try {
  86     return D.run();
  87   } catch (ToolExecutionError &TEE) {
  88     std::cerr << "Tool execution error: " << TEE.what() << '\n';
  89   } catch (const std::string& msg) {
  90     std::cerr << argv[0] << ": " << msg << "\n";
  91   } catch (const std::bad_alloc &e) {
  92     std::cerr << "Oh no, a bugpoint process ran out of memory!\n"
  93                  "To increase the allocation limits for bugpoint child\n"
  94                  "processes, use the -mlimit option.\n";
  95   } catch (const std::exception &e) {
  96     std::cerr << "Whoops, a std::exception leaked out of bugpoint: "
  97               << e.what() << "\n"
  98               << "This is a bug in bugpoint!\n";
  99   } catch (...) {
 100     std::cerr << "Whoops, an exception leaked out of bugpoint.  "
 101               << "This is a bug in bugpoint!\n";
 102   }
 103   return 1;
 104 }