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/Support/Process.h"
  27 #include "llvm/Support/Signals.h"
  28 #include "llvm/Support/Valgrind.h"
  29 #include "llvm/LinkAllVMCore.h"
  30 using namespace llvm;
  31
  32 static cl::opt<bool>
  33 FindBugs("find-bugs", cl::desc("Run many different optimization sequences "
  34                                "on program to find bugs"), cl::init(false));
  35
  36 static cl::list<std::string>
  37 InputFilenames(cl::Positional, cl::OneOrMore,
  38                cl::desc("<input llvm ll/bc files>"));
  39
  40 static cl::opt<unsigned>
  41 TimeoutValue("timeout", cl::init(300), cl::value_desc("seconds"),
  42              cl::desc("Number of seconds program is allowed to run before it "
  43                       "is killed (default is 300s), 0 disables timeout"));
  44
  45 static cl::opt<int>
  46 MemoryLimit("mlimit", cl::init(-1), cl::value_desc("MBytes"),
  47              cl::desc("Maximum amount of memory to use. 0 disables check."
  48                       " Defaults to 100MB (800MB under valgrind)."));
  49
  50 static cl::opt<bool>
  51 UseValgrind("enable-valgrind",
  52             cl::desc("Run optimizations through valgrind"));
  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 static cl::opt<bool>
  61 StandardCompileOpts("std-compile-opts",
  62                    cl::desc("Include the standard compile time optimizations"));
  63
  64 static cl::opt<bool>
  65 StandardLinkOpts("std-link-opts",
  66                  cl::desc("Include the standard link time optimizations"));
  67
  68 static cl::opt<std::string>
  69 OverrideTriple("mtriple", cl::desc("Override target triple for module"));
  70
  71 /// BugpointIsInterrupted - Set to true when the user presses ctrl-c.
  72 bool llvm::BugpointIsInterrupted = false;
  73
  74 static void BugpointInterruptFunction() {
  75   BugpointIsInterrupted = true;
  76 }
  77
  78 // Hack to capture a pass list.
  79 namespace {
  80   class AddToDriver : public PassManager {
  81     BugDriver &D;
  82   public:
  83     AddToDriver(BugDriver &_D) : D(_D) {}
  84
  85     virtual void add(Pass *P) {
  86       const void *ID = P->getPassID();
  87       const PassInfo *PI = PassRegistry::getPassRegistry()->getPassInfo(ID);
  88       D.addPass(PI->getPassArgument());
  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
  98   // Initialize passes
  99   PassRegistry &Registry = *PassRegistry::getPassRegistry();
 100   initializeCore(Registry);
 101   initializeScalarOpts(Registry);
 102   initializeIPO(Registry);
 103   initializeAnalysis(Registry);
 104   initializeIPA(Registry);
 105   initializeTransformUtils(Registry);
 106   initializeInstCombine(Registry);
 107   initializeInstrumentation(Registry);
 108   initializeTarget(Registry);
 109
 110   cl::ParseCommandLineOptions(argc, argv,
 111                               "LLVM automatic testcase reducer. See\nhttp://"
 112                               "llvm.org/cmds/bugpoint.html"
 113                               " for more information.\n");
 114   sys::SetInterruptFunction(BugpointInterruptFunction);
 115
 116   LLVMContext& Context = getGlobalContext();
 117   // If we have an override, set it and then track the triple we want Modules
 118   // to use.
 119   if (!OverrideTriple.empty()) {
 120     TargetTriple.setTriple(Triple::normalize(OverrideTriple));
 121     outs() << "Override triple set to '" << TargetTriple.getTriple() << "'\n";
 122   }
 123
 124   if (MemoryLimit < 0) {
 125     // Set the default MemoryLimit.  Be sure to update the flag's description if
 126     // you change this.
 127     if (sys::RunningOnValgrind() || UseValgrind)
 128       MemoryLimit = 800;
 129     else
 130       MemoryLimit = 100;
 131   }
 132
 133   BugDriver D(argv[0], FindBugs, TimeoutValue, MemoryLimit,
 134               UseValgrind, Context);
 135   if (D.addSources(InputFilenames)) return 1;
 136
 137   AddToDriver PM(D);
 138   if (StandardCompileOpts) {
 139     createStandardModulePasses(&PM, 3,
 140                                /*OptimizeSize=*/ false,
 141                                /*UnitAtATime=*/ true,
 142                                /*UnrollLoops=*/ true,
 143                                /*SimplifyLibCalls=*/ true,
 144                                /*HaveExceptions=*/ true,
 145                                createFunctionInliningPass());
 146   }
 147
 148   if (StandardLinkOpts)
 149     createStandardLTOPasses(&PM, /*Internalize=*/true,
 150                             /*RunInliner=*/true,
 151                             /*VerifyEach=*/false);
 152
 153
 154   for (std::vector<const PassInfo*>::iterator I = PassList.begin(),
 155          E = PassList.end();
 156        I != E; ++I) {
 157     const PassInfo* PI = *I;
 158     D.addPass(PI->getPassArgument());
 159   }
 160
 161   // Bugpoint has the ability of generating a plethora of core files, so to
 162   // avoid filling up the disk, we prevent it
 163   sys::Process::PreventCoreFiles();
 164
 165   std::string Error;
 166   bool Failure = D.run(Error);
 167   if (!Error.empty()) {
 168     errs() << Error;
 169     return 1;
 170   }
 171   return Failure;
 172 }