bugpoint.cpp revision 280031
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/IR/LegacyPassNameParser.h" 20#include "llvm/LinkAllIR.h" 21#include "llvm/LinkAllPasses.h" 22#include "llvm/PassManager.h" 23#include "llvm/Support/CommandLine.h" 24#include "llvm/Support/ManagedStatic.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 35using namespace llvm; 36 37static cl::opt<bool> 38FindBugs("find-bugs", cl::desc("Run many different optimization sequences " 39 "on program to find bugs"), cl::init(false)); 40 41static cl::list<std::string> 42InputFilenames(cl::Positional, cl::OneOrMore, 43 cl::desc("<input llvm ll/bc files>")); 44 45static cl::opt<unsigned> 46TimeoutValue("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 50static cl::opt<int> 51MemoryLimit("mlimit", cl::init(-1), cl::value_desc("MBytes"), 52 cl::desc("Maximum amount of memory to use. 0 disables check." 53 " Defaults to 300MB (800MB under valgrind).")); 54 55static cl::opt<bool> 56UseValgrind("enable-valgrind", 57 cl::desc("Run optimizations through valgrind")); 58 59// The AnalysesList is automatically populated with registered Passes by the 60// PassNameParser. 61// 62static cl::list<const PassInfo*, bool, PassNameParser> 63PassList(cl::desc("Passes available:"), cl::ZeroOrMore); 64 65static cl::opt<bool> 66StandardLinkOpts("std-link-opts", 67 cl::desc("Include the standard link time optimizations")); 68 69static cl::opt<bool> 70OptLevelO1("O1", 71 cl::desc("Optimization level 1. Identical to 'opt -O1'")); 72 73static cl::opt<bool> 74OptLevelO2("O2", 75 cl::desc("Optimization level 2. Identical to 'opt -O2'")); 76 77static cl::opt<bool> 78OptLevelO3("O3", 79 cl::desc("Optimization level 3. Identical to 'opt -O3'")); 80 81static cl::opt<std::string> 82OverrideTriple("mtriple", cl::desc("Override target triple for module")); 83 84/// BugpointIsInterrupted - Set to true when the user presses ctrl-c. 85bool llvm::BugpointIsInterrupted = false; 86 87#ifndef DEBUG_BUGPOINT 88static void BugpointInterruptFunction() { 89 BugpointIsInterrupted = true; 90} 91#endif 92 93// Hack to capture a pass list. 94namespace { 95 class AddToDriver : public FunctionPassManager { 96 BugDriver &D; 97 public: 98 AddToDriver(BugDriver &_D) : FunctionPassManager(nullptr), D(_D) {} 99 100 void add(Pass *P) override { 101 const void *ID = P->getPassID(); 102 const PassInfo *PI = PassRegistry::getPassRegistry()->getPassInfo(ID); 103 D.addPass(PI->getPassArgument()); 104 } 105 }; 106} 107 108#ifdef LINK_POLLY_INTO_TOOLS 109namespace polly { 110void initializePollyPasses(llvm::PassRegistry &Registry); 111} 112#endif 113 114int main(int argc, char **argv) { 115#ifndef DEBUG_BUGPOINT 116 llvm::sys::PrintStackTraceOnErrorSignal(); 117 llvm::PrettyStackTraceProgram X(argc, argv); 118 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit. 119#endif 120 121 // Initialize passes 122 PassRegistry &Registry = *PassRegistry::getPassRegistry(); 123 initializeCore(Registry); 124 initializeScalarOpts(Registry); 125 initializeObjCARCOpts(Registry); 126 initializeVectorization(Registry); 127 initializeIPO(Registry); 128 initializeAnalysis(Registry); 129 initializeIPA(Registry); 130 initializeTransformUtils(Registry); 131 initializeInstCombine(Registry); 132 initializeInstrumentation(Registry); 133 initializeTarget(Registry); 134 135#ifdef LINK_POLLY_INTO_TOOLS 136 polly::initializePollyPasses(Registry); 137#endif 138 139 cl::ParseCommandLineOptions(argc, argv, 140 "LLVM automatic testcase reducer. See\nhttp://" 141 "llvm.org/cmds/bugpoint.html" 142 " for more information.\n"); 143#ifndef DEBUG_BUGPOINT 144 sys::SetInterruptFunction(BugpointInterruptFunction); 145#endif 146 147 LLVMContext& Context = getGlobalContext(); 148 // If we have an override, set it and then track the triple we want Modules 149 // to use. 150 if (!OverrideTriple.empty()) { 151 TargetTriple.setTriple(Triple::normalize(OverrideTriple)); 152 outs() << "Override triple set to '" << TargetTriple.getTriple() << "'\n"; 153 } 154 155 if (MemoryLimit < 0) { 156 // Set the default MemoryLimit. Be sure to update the flag's description if 157 // you change this. 158 if (sys::RunningOnValgrind() || UseValgrind) 159 MemoryLimit = 800; 160 else 161 MemoryLimit = 300; 162 } 163 164 BugDriver D(argv[0], FindBugs, TimeoutValue, MemoryLimit, 165 UseValgrind, Context); 166 if (D.addSources(InputFilenames)) return 1; 167 168 AddToDriver PM(D); 169 170 if (StandardLinkOpts) { 171 PassManagerBuilder Builder; 172 Builder.Inliner = createFunctionInliningPass(); 173 Builder.populateLTOPassManager(PM); 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