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/IR/LLVMContext.h" 19 #include "llvm/LinkAllIR.h" 20 #include "llvm/LinkAllPasses.h" 21 #include "llvm/PassManager.h" 22 #include "llvm/Support/CommandLine.h" 23 #include "llvm/Support/ManagedStatic.h" 24 #include "llvm/Support/PassNameParser.h" 25 #include "llvm/Support/PluginLoader.h" 26 #include "llvm/Support/PrettyStackTrace.h" 27 #include "llvm/Support/Process.h" 28 #include "llvm/Support/Signals.h" 29 #include "llvm/Support/Valgrind.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 initializeObjCARCOpts(Registry); 124 initializeVectorization(Registry); 125 initializeIPO(Registry); 126 initializeAnalysis(Registry); 127 initializeIPA(Registry); 128 initializeTransformUtils(Registry); 129 initializeInstCombine(Registry); 130 initializeInstrumentation(Registry); 131 initializeTarget(Registry); 132 133 cl::ParseCommandLineOptions(argc, argv, 134 "LLVM automatic testcase reducer. See\nhttp://" 135 "llvm.org/cmds/bugpoint.html" 136 " for more information.\n"); 137 #ifndef DEBUG_BUGPOINT 138 sys::SetInterruptFunction(BugpointInterruptFunction); 139 #endif 140 141 LLVMContext& Context = getGlobalContext(); 142 // If we have an override, set it and then track the triple we want Modules 143 // to use. 144 if (!OverrideTriple.empty()) { 145 TargetTriple.setTriple(Triple::normalize(OverrideTriple)); 146 outs() << "Override triple set to '" << TargetTriple.getTriple() << "'\n"; 147 } 148 149 if (MemoryLimit < 0) { 150 // Set the default MemoryLimit. Be sure to update the flag's description if 151 // you change this. 152 if (sys::RunningOnValgrind() || UseValgrind) 153 MemoryLimit = 800; 154 else 155 MemoryLimit = 100; 156 } 157 158 BugDriver D(argv[0], FindBugs, TimeoutValue, MemoryLimit, 159 UseValgrind, Context); 160 if (D.addSources(InputFilenames)) return 1; 161 162 AddToDriver PM(D); 163 if (StandardCompileOpts) { 164 PassManagerBuilder Builder; 165 Builder.OptLevel = 3; 166 Builder.Inliner = createFunctionInliningPass(); 167 Builder.populateModulePassManager(PM); 168 } 169 170 if (StandardLinkOpts) { 171 PassManagerBuilder Builder; 172 Builder.populateLTOPassManager(PM, /*Internalize=*/true, 173 /*RunInliner=*/true); 174 } 175 176 if (OptLevelO1 || OptLevelO2 || OptLevelO3) { 177 PassManagerBuilder Builder; 178 if (OptLevelO1) 179 Builder.Inliner = createAlwaysInlinerPass(); 180 else if (OptLevelO2) 181 Builder.Inliner = createFunctionInliningPass(225); 182 else 183 Builder.Inliner = createFunctionInliningPass(275); 184 185 // Note that although clang/llvm-gcc use two separate passmanagers 186 // here, it shouldn't normally make a difference. 187 Builder.populateFunctionPassManager(PM); 188 Builder.populateModulePassManager(PM); 189 } 190 191 for (std::vector<const PassInfo*>::iterator I = PassList.begin(), 192 E = PassList.end(); 193 I != E; ++I) { 194 const PassInfo* PI = *I; 195 D.addPass(PI->getPassArgument()); 196 } 197 198 // Bugpoint has the ability of generating a plethora of core files, so to 199 // avoid filling up the disk, we prevent it 200 #ifndef DEBUG_BUGPOINT 201 sys::Process::PreventCoreFiles(); 202 #endif 203 204 std::string Error; 205 bool Failure = D.run(Error); 206 if (!Error.empty()) { 207 errs() << Error; 208 return 1; 209 } 210 return Failure; 211 } 212
