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/LLVMContext.h"
  20 #include "llvm/Support/PassNameParser.h"
  21 #include "llvm/Support/CommandLine.h"
  22 #include "llvm/Support/ManagedStatic.h"
  23 #include "llvm/Support/PluginLoader.h"
  24 #include "llvm/Support/PrettyStackTrace.h"
  25 #include "llvm/Support/StandardPasses.h"
  26 #include "llvm/System/Process.h"
  27 #include "llvm/System/Signals.h"
  28 #include "llvm/LinkAllVMCore.h"
  29 using namespace llvm;
  30
  31 // AsChild - Specifies that this invocation of bugpoint is being generated
  32 // from a parent process. It is not intended to be used by users so the
  33 // option is hidden.
  34 static cl::opt<bool>
  35 AsChild("as-child", cl::desc("Run bugpoint as child process"),
  36         cl::ReallyHidden);
  37
  38 static cl::opt<bool>
  39 FindBugs("find-bugs", cl::desc("Run many different optimization sequences "
  40                                "on program to find bugs"), cl::init(false));
  41
  42 static cl::list<std::string>
  43 InputFilenames(cl::Positional, cl::OneOrMore,
  44                cl::desc("<input llvm ll/bc files>"));
  45
  46 static cl::opt<unsigned>
  47 TimeoutValue("timeout", cl::init(300), cl::value_desc("seconds"),
  48              cl::desc("Number of seconds program is allowed to run before it "
  49                       "is killed (default is 300s), 0 disables timeout"));
  50
  51 static cl::opt<unsigned>
  52 MemoryLimit("mlimit", cl::init(100), cl::value_desc("MBytes"),
  53              cl::desc("Maximum amount of memory to use. 0 disables check."));
  54
  55 // The AnalysesList is automatically populated with registered Passes by the
  56 // PassNameParser.
  57 //
  58 static cl::list<const PassInfo*, bool, PassNameParser>
  59 PassList(cl::desc("Passes available:"), cl::ZeroOrMore);
  60
  61 static cl::opt<bool>
  62 StandardCompileOpts("std-compile-opts",
  63                    cl::desc("Include the standard compile time optimizations"));
  64
  65 static cl::opt<bool>
  66 StandardLinkOpts("std-link-opts",
  67                  cl::desc("Include the standard link time optimizations"));
  68
  69 static cl::opt<std::string>
  70 OverrideTriple("mtriple", cl::desc("Override target triple for module"));
  71
  72 /// BugpointIsInterrupted - Set to true when the user presses ctrl-c.
  73 bool llvm::BugpointIsInterrupted = false;
  74
  75 static void BugpointInterruptFunction() {
  76   BugpointIsInterrupted = true;
  77 }
  78
  79 // Hack to capture a pass list.
  80 namespace {
  81   class AddToDriver : public PassManager {
  82     BugDriver &D;
  83   public:
  84     AddToDriver(BugDriver &_D) : D(_D) {}
  85
  86     virtual void add(Pass *P) {
  87       const PassInfo *PI = P->getPassInfo();
  88       D.addPasses(&PI, &PI + 1);
  89     }
  90   };
  91 }
  92
  93 int main(int argc, char **argv) {
  94   llvm::sys::PrintStackTraceOnErrorSignal();
  95   llvm::PrettyStackTraceProgram X(argc, argv);
  96   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
  97   cl::ParseCommandLineOptions(argc, argv,
  98                               "LLVM automatic testcase reducer. See\nhttp://"
  99                               "llvm.org/cmds/bugpoint.html"
 100                               " for more information.\n");
 101   sys::SetInterruptFunction(BugpointInterruptFunction);
 102
 103   LLVMContext& Context = getGlobalContext();
 104   // If we have an override, set it and then track the triple we want Modules
 105   // to use.
 106   if (!OverrideTriple.empty()) {
 107     TargetTriple.setTriple(OverrideTriple);
 108     outs() << "Override triple set to '" << OverrideTriple << "'\n";
 109   }
 110
 111   BugDriver D(argv[0], AsChild, FindBugs, TimeoutValue, MemoryLimit, Context);
 112   if (D.addSources(InputFilenames)) return 1;
 113
 114   AddToDriver PM(D);
 115   if (StandardCompileOpts) {
 116     createStandardModulePasses(&PM, 3,
 117                                /*OptimizeSize=*/ false,
 118                                /*UnitAtATime=*/ true,
 119                                /*UnrollLoops=*/ true,
 120                                /*SimplifyLibCalls=*/ true,
 121                                /*HaveExceptions=*/ true,
 122                                createFunctionInliningPass());
 123   }
 124
 125   if (StandardLinkOpts)
 126     createStandardLTOPasses(&PM, /*Internalize=*/true,
 127                             /*RunInliner=*/true,
 128                             /*VerifyEach=*/false);
 129
 130   D.addPasses(PassList.begin(), PassList.end());
 131
 132   // Bugpoint has the ability of generating a plethora of core files, so to
 133   // avoid filling up the disk, we prevent it
 134   sys::Process::PreventCoreFiles();
 135
 136   try {
 137     return D.run();
 138   } catch (ToolExecutionError &TEE) {
 139     errs() << "Tool execution error: " << TEE.what() << '\n';
 140   } catch (const std::string& msg) {
 141     errs() << argv[0] << ": " << msg << "\n";
 142   } catch (const std::bad_alloc&) {
 143     errs() << "Oh no, a bugpoint process ran out of memory!\n"
 144               "To increase the allocation limits for bugpoint child\n"
 145               "processes, use the -mlimit option.\n";
 146   } catch (const std::exception &e) {
 147     errs() << "Whoops, a std::exception leaked out of bugpoint: "
 148            << e.what() << "\n"
 149            << "This is a bug in bugpoint!\n";
 150   } catch (...) {
 151     errs() << "Whoops, an exception leaked out of bugpoint.  "
 152            << "This is a bug in bugpoint!\n";
 153   }
 154   return 1;
 155 }