1 //===- bugpoint.cpp - The LLVM Bugpoint utility ---------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This program is an automated compiler debugger tool. It is used to narrow 10 // down miscompilations and crash problems to a specific pass in the compiler, 11 // and the specific Module or Function input that is causing the problem. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #include "BugDriver.h" 16 #include "ToolRunner.h" 17 #include "llvm/Config/llvm-config.h" 18 #include "llvm/IR/LLVMContext.h" 19 #include "llvm/IR/LegacyPassManager.h" 20 #include "llvm/IR/LegacyPassNameParser.h" 21 #include "llvm/InitializePasses.h" 22 #include "llvm/LinkAllIR.h" 23 #include "llvm/LinkAllPasses.h" 24 #include "llvm/Passes/PassPlugin.h" 25 #include "llvm/Support/CommandLine.h" 26 #include "llvm/Support/InitLLVM.h" 27 #include "llvm/Support/ManagedStatic.h" 28 #include "llvm/Support/PluginLoader.h" 29 #include "llvm/Support/PrettyStackTrace.h" 30 #include "llvm/Support/Process.h" 31 #include "llvm/Support/TargetSelect.h" 32 #include "llvm/Support/Valgrind.h" 33 #include "llvm/Transforms/IPO/AlwaysInliner.h" 34 #include "llvm/Transforms/IPO/PassManagerBuilder.h" 35 36 // Enable this macro to debug bugpoint itself. 37 //#define DEBUG_BUGPOINT 1 38 39 using namespace llvm; 40 41 static cl::opt<bool> 42 FindBugs("find-bugs", cl::desc("Run many different optimization sequences " 43 "on program to find bugs"), 44 cl::init(false)); 45 46 static cl::list<std::string> 47 InputFilenames(cl::Positional, cl::OneOrMore, 48 cl::desc("<input llvm ll/bc files>")); 49 50 static cl::opt<unsigned> TimeoutValue( 51 "timeout", cl::init(300), cl::value_desc("seconds"), 52 cl::desc("Number of seconds program is allowed to run before it " 53 "is killed (default is 300s), 0 disables timeout")); 54 55 static cl::opt<int> MemoryLimit( 56 "mlimit", cl::init(-1), cl::value_desc("MBytes"), 57 cl::desc("Maximum amount of memory to use. 0 disables check. Defaults to " 58 "400MB (800MB under valgrind, 0 with sanitizers).")); 59 60 static cl::opt<bool> 61 UseValgrind("enable-valgrind", 62 cl::desc("Run optimizations through valgrind")); 63 64 // The AnalysesList is automatically populated with registered Passes by the 65 // PassNameParser. 66 // 67 static cl::list<const PassInfo *, bool, PassNameParser> 68 PassList(cl::desc("Passes available:"), cl::ZeroOrMore); 69 70 static cl::opt<bool> 71 StandardLinkOpts("std-link-opts", 72 cl::desc("Include the standard link time optimizations")); 73 74 static cl::opt<bool> 75 OptLevelO1("O1", cl::desc("Optimization level 1. Identical to 'opt -O1'")); 76 77 static cl::opt<bool> 78 OptLevelO2("O2", cl::desc("Optimization level 2. Identical to 'opt -O2'")); 79 80 static cl::opt<bool> OptLevelOs( 81 "Os", 82 cl::desc( 83 "Like -O2 with extra optimizations for size. Similar to clang -Os")); 84 85 static cl::opt<bool> 86 OptLevelOz("Oz", 87 cl::desc("Like -Os but reduces code size further. Similar to clang -Oz")); 88 89 static cl::opt<bool> 90 OptLevelO3("O3", cl::desc("Optimization level 3. Identical to 'opt -O3'")); 91 92 static cl::opt<std::string> 93 OverrideTriple("mtriple", cl::desc("Override target triple for module")); 94 95 /// BugpointIsInterrupted - Set to true when the user presses ctrl-c. 96 bool llvm::BugpointIsInterrupted = false; 97 98 #ifndef DEBUG_BUGPOINT 99 static void BugpointInterruptFunction() { BugpointIsInterrupted = true; } 100 #endif 101 102 // Hack to capture a pass list. 103 namespace { 104 class AddToDriver : public legacy::FunctionPassManager { 105 BugDriver &D; 106 107 public: 108 AddToDriver(BugDriver &_D) : FunctionPassManager(nullptr), D(_D) {} 109 110 void add(Pass *P) override { 111 const void *ID = P->getPassID(); 112 const PassInfo *PI = PassRegistry::getPassRegistry()->getPassInfo(ID); 113 D.addPass(std::string(PI->getPassArgument())); 114 } 115 }; 116 } 117 118 // This routine adds optimization passes based on selected optimization level, 119 // OptLevel. 120 // 121 // OptLevel - Optimization Level 122 static void AddOptimizationPasses(legacy::FunctionPassManager &FPM, 123 unsigned OptLevel, 124 unsigned SizeLevel) { 125 PassManagerBuilder Builder; 126 Builder.OptLevel = OptLevel; 127 Builder.SizeLevel = SizeLevel; 128 129 if (OptLevel > 1) 130 Builder.Inliner = createFunctionInliningPass(OptLevel, SizeLevel, false); 131 else 132 Builder.Inliner = createAlwaysInlinerLegacyPass(); 133 134 Builder.populateFunctionPassManager(FPM); 135 Builder.populateModulePassManager(FPM); 136 } 137 138 #define HANDLE_EXTENSION(Ext) \ 139 llvm::PassPluginLibraryInfo get##Ext##PluginInfo(); 140 #include "llvm/Support/Extension.def" 141 142 int main(int argc, char **argv) { 143 #ifndef DEBUG_BUGPOINT 144 InitLLVM X(argc, argv); 145 #endif 146 147 // Initialize passes 148 PassRegistry &Registry = *PassRegistry::getPassRegistry(); 149 initializeCore(Registry); 150 initializeScalarOpts(Registry); 151 initializeObjCARCOpts(Registry); 152 initializeVectorization(Registry); 153 initializeIPO(Registry); 154 initializeAnalysis(Registry); 155 initializeTransformUtils(Registry); 156 initializeInstCombine(Registry); 157 initializeAggressiveInstCombine(Registry); 158 initializeInstrumentation(Registry); 159 initializeTarget(Registry); 160 161 if (std::getenv("bar") == (char*) -1) { 162 InitializeAllTargets(); 163 InitializeAllTargetMCs(); 164 InitializeAllAsmPrinters(); 165 InitializeAllAsmParsers(); 166 } 167 168 cl::ParseCommandLineOptions(argc, argv, 169 "LLVM automatic testcase reducer. See\nhttp://" 170 "llvm.org/cmds/bugpoint.html" 171 " for more information.\n"); 172 #ifndef DEBUG_BUGPOINT 173 sys::SetInterruptFunction(BugpointInterruptFunction); 174 #endif 175 176 LLVMContext Context; 177 // If we have an override, set it and then track the triple we want Modules 178 // to use. 179 if (!OverrideTriple.empty()) { 180 TargetTriple.setTriple(Triple::normalize(OverrideTriple)); 181 outs() << "Override triple set to '" << TargetTriple.getTriple() << "'\n"; 182 } 183 184 if (MemoryLimit < 0) { 185 // Set the default MemoryLimit. Be sure to update the flag's description if 186 // you change this. 187 if (sys::RunningOnValgrind() || UseValgrind) 188 MemoryLimit = 800; 189 else 190 MemoryLimit = 400; 191 #if (LLVM_ADDRESS_SANITIZER_BUILD || LLVM_MEMORY_SANITIZER_BUILD || \ 192 LLVM_THREAD_SANITIZER_BUILD) 193 // Starting from kernel 4.9 memory allocated with mmap is counted against 194 // RLIMIT_DATA. Sanitizers need to allocate tens of terabytes for shadow. 195 MemoryLimit = 0; 196 #endif 197 } 198 199 BugDriver D(argv[0], FindBugs, TimeoutValue, MemoryLimit, UseValgrind, 200 Context); 201 if (D.addSources(InputFilenames)) 202 return 1; 203 204 AddToDriver PM(D); 205 206 if (StandardLinkOpts) { 207 PassManagerBuilder Builder; 208 Builder.Inliner = createFunctionInliningPass(); 209 Builder.populateLTOPassManager(PM); 210 } 211 212 if (OptLevelO1) 213 AddOptimizationPasses(PM, 1, 0); 214 else if (OptLevelO2) 215 AddOptimizationPasses(PM, 2, 0); 216 else if (OptLevelO3) 217 AddOptimizationPasses(PM, 3, 0); 218 else if (OptLevelOs) 219 AddOptimizationPasses(PM, 2, 1); 220 else if (OptLevelOz) 221 AddOptimizationPasses(PM, 2, 2); 222 223 for (const PassInfo *PI : PassList) 224 D.addPass(std::string(PI->getPassArgument())); 225 226 // Bugpoint has the ability of generating a plethora of core files, so to 227 // avoid filling up the disk, we prevent it 228 #ifndef DEBUG_BUGPOINT 229 sys::Process::PreventCoreFiles(); 230 #endif 231 232 // Needed to pull in symbols from statically linked extensions, including static 233 // registration. It is unused otherwise because bugpoint has no support for 234 // NewPM. 235 #define HANDLE_EXTENSION(Ext) \ 236 (void)get##Ext##PluginInfo(); 237 #include "llvm/Support/Extension.def" 238 239 if (Error E = D.run()) { 240 errs() << toString(std::move(E)); 241 return 1; 242 } 243 return 0; 244 } 245