src/llvm/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/PassManager.h"
  21 #include "llvm/Support/PassNameParser.h"
  22 #include "llvm/Support/CommandLine.h"
  23 #include "llvm/Support/ManagedStatic.h"
  24 #include "llvm/Support/PluginLoader.h"
  25 #include "llvm/Support/PrettyStackTrace.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 #include "llvm/Transforms/IPO/PassManagerBuilder.h"
  31
  32 //Enable this macro to debug bugpoint itself.
  33 //#define DEBUG_BUGPOINT 1
  34
  35 using namespace llvm;
  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<int>
  51 MemoryLimit("mlimit", cl::init(-1), cl::value_desc("MBytes"),
  52              cl::desc("Maximum amount of memory to use. 0 disables check."
  53                       " Defaults to 100MB (800MB under valgrind)."));
  54
  55 static cl::opt<bool>
  56 UseValgrind("enable-valgrind",
  57             cl::desc("Run optimizations through valgrind"));
  58
  59 // The AnalysesList is automatically populated with registered Passes by the
  60 // PassNameParser.
  61 //
  62 static cl::list<const PassInfo*, bool, PassNameParser>
  63 PassList(cl::desc("Passes available:"), cl::ZeroOrMore);
  64
  65 static cl::opt<bool>
  66 StandardCompileOpts("std-compile-opts",
  67                    cl::desc("Include the standard compile time optimizations"));
  68
  69 static cl::opt<bool>
  70 StandardLinkOpts("std-link-opts",
  71                  cl::desc("Include the standard link time optimizations"));
  72
  73 static cl::opt<bool>
  74 OptLevelO1("O1",
  75            cl::desc("Optimization level 1. Similar to llvm-gcc -O1"));
  76
  77 static cl::opt<bool>
  78 OptLevelO2("O2",
  79            cl::desc("Optimization level 2. Similar to llvm-gcc -O2"));
  80
  81 static cl::opt<bool>
  82 OptLevelO3("O3",
  83            cl::desc("Optimization level 3. Similar to llvm-gcc -O3"));
  84
  85 static cl::opt<std::string>
  86 OverrideTriple("mtriple", cl::desc("Override target triple for module"));
  87
  88 /// BugpointIsInterrupted - Set to true when the user presses ctrl-c.
  89 bool llvm::BugpointIsInterrupted = false;
  90
  91 #ifndef DEBUG_BUGPOINT
  92 static void BugpointInterruptFunction() {
  93   BugpointIsInterrupted = true;
  94 }
  95 #endif
  96
  97 // Hack to capture a pass list.
  98 namespace {
  99   class AddToDriver : public FunctionPassManager {
 100     BugDriver &D;
 101   public:
 102     AddToDriver(BugDriver &_D) : FunctionPassManager(0), D(_D) {}
 103
 104     virtual void add(Pass *P) {
 105       const void *ID = P->getPassID();
 106       const PassInfo *PI = PassRegistry::getPassRegistry()->getPassInfo(ID);
 107       D.addPass(PI->getPassArgument());
 108     }
 109   };
 110 }
 111
 112 int main(int argc, char **argv) {
 113 #ifndef DEBUG_BUGPOINT
 114   llvm::sys::PrintStackTraceOnErrorSignal();
 115   llvm::PrettyStackTraceProgram X(argc, argv);
 116   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
 117 #endif
 118
 119   // Initialize passes
 120   PassRegistry &Registry = *PassRegistry::getPassRegistry();
 121   initializeCore(Registry);
 122   initializeScalarOpts(Registry);
 123   initializeVectorization(Registry);
 124   initializeIPO(Registry);
 125   initializeAnalysis(Registry);
 126   initializeIPA(Registry);
 127   initializeTransformUtils(Registry);
 128   initializeInstCombine(Registry);
 129   initializeInstrumentation(Registry);
 130   initializeTarget(Registry);
 131
 132   cl::ParseCommandLineOptions(argc, argv,
 133                               "LLVM automatic testcase reducer. See\nhttp://"
 134                               "llvm.org/cmds/bugpoint.html"
 135                               " for more information.\n");
 136 #ifndef DEBUG_BUGPOINT
 137   sys::SetInterruptFunction(BugpointInterruptFunction);
 138 #endif
 139
 140   LLVMContext& Context = getGlobalContext();
 141   // If we have an override, set it and then track the triple we want Modules
 142   // to use.
 143   if (!OverrideTriple.empty()) {
 144     TargetTriple.setTriple(Triple::normalize(OverrideTriple));
 145     outs() << "Override triple set to '" << TargetTriple.getTriple() << "'\n";
 146   }
 147
 148   if (MemoryLimit < 0) {
 149     // Set the default MemoryLimit.  Be sure to update the flag's description if
 150     // you change this.
 151     if (sys::RunningOnValgrind() || UseValgrind)
 152       MemoryLimit = 800;
 153     else
 154       MemoryLimit = 100;
 155   }
 156
 157   BugDriver D(argv[0], FindBugs, TimeoutValue, MemoryLimit,
 158               UseValgrind, Context);
 159   if (D.addSources(InputFilenames)) return 1;
 160
 161   AddToDriver PM(D);
 162   if (StandardCompileOpts) {
 163     PassManagerBuilder Builder;
 164     Builder.OptLevel = 3;
 165     Builder.Inliner = createFunctionInliningPass();
 166     Builder.populateModulePassManager(PM);
 167   }
 168
 169   if (StandardLinkOpts) {
 170     PassManagerBuilder Builder;
 171     Builder.populateLTOPassManager(PM, /*Internalize=*/true,
 172                                    /*RunInliner=*/true);
 173   }
 174
 175   if (OptLevelO1 || OptLevelO2 || OptLevelO3) {
 176     PassManagerBuilder Builder;
 177     if (OptLevelO1)
 178       Builder.Inliner = createAlwaysInlinerPass();
 179     else if (OptLevelO2)
 180       Builder.Inliner = createFunctionInliningPass(225);
 181     else
 182       Builder.Inliner = createFunctionInliningPass(275);
 183
 184     // Note that although clang/llvm-gcc use two separate passmanagers
 185     // here, it shouldn't normally make a difference.
 186     Builder.populateFunctionPassManager(PM);
 187     Builder.populateModulePassManager(PM);
 188   }
 189
 190   for (std::vector<const PassInfo*>::iterator I = PassList.begin(),
 191          E = PassList.end();
 192        I != E; ++I) {
 193     const PassInfo* PI = *I;
 194     D.addPass(PI->getPassArgument());
 195   }
 196
 197   // Bugpoint has the ability of generating a plethora of core files, so to
 198   // avoid filling up the disk, we prevent it
 199 #ifndef DEBUG_BUGPOINT
 200   sys::Process::PreventCoreFiles();
 201 #endif
 202
 203   std::string Error;
 204   bool Failure = D.run(Error);
 205   if (!Error.empty()) {
 206     errs() << Error;
 207     return 1;
 208   }
 209   return Failure;
 210 }