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/PluginLoader.h" 28 #include "llvm/Support/PrettyStackTrace.h" 29 #include "llvm/Support/Process.h" 30 #include "llvm/Support/TargetSelect.h" 31 #include "llvm/Support/Valgrind.h" 32 #include "llvm/Transforms/IPO/AlwaysInliner.h" 33 34 // Enable this macro to debug bugpoint itself. 35 //#define DEBUG_BUGPOINT 1 36 37 using namespace llvm; 38 39 static cl::opt<bool> 40 FindBugs("find-bugs", cl::desc("Run many different optimization sequences " 41 "on program to find bugs"), 42 cl::init(false)); 43 44 static cl::list<std::string> 45 InputFilenames(cl::Positional, cl::OneOrMore, 46 cl::desc("<input llvm ll/bc files>")); 47 48 static cl::opt<unsigned> TimeoutValue( 49 "timeout", cl::init(300), cl::value_desc("seconds"), 50 cl::desc("Number of seconds program is allowed to run before it " 51 "is killed (default is 300s), 0 disables timeout")); 52 53 static cl::opt<int> MemoryLimit( 54 "mlimit", cl::init(-1), cl::value_desc("MBytes"), 55 cl::desc("Maximum amount of memory to use. 0 disables check. Defaults to " 56 "400MB (800MB under valgrind, 0 with sanitizers).")); 57 58 static cl::opt<bool> 59 UseValgrind("enable-valgrind", 60 cl::desc("Run optimizations through valgrind")); 61 62 // The AnalysesList is automatically populated with registered Passes by the 63 // PassNameParser. 64 // 65 static cl::list<const PassInfo *, bool, PassNameParser> 66 PassList(cl::desc("Passes available:")); 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 #ifndef DEBUG_BUGPOINT 75 static void BugpointInterruptFunction() { BugpointIsInterrupted = true; } 76 #endif 77 78 // Hack to capture a pass list. 79 namespace { 80 class AddToDriver : public legacy::FunctionPassManager { 81 BugDriver &D; 82 83 public: 84 AddToDriver(BugDriver &_D) : FunctionPassManager(nullptr), D(_D) {} 85 86 void add(Pass *P) override { 87 const void *ID = P->getPassID(); 88 const PassInfo *PI = PassRegistry::getPassRegistry()->getPassInfo(ID); 89 D.addPass(std::string(PI->getPassArgument())); 90 } 91 }; 92 } 93 94 #define HANDLE_EXTENSION(Ext) \ 95 llvm::PassPluginLibraryInfo get##Ext##PluginInfo(); 96 #include "llvm/Support/Extension.def" 97 98 int main(int argc, char **argv) { 99 #ifndef DEBUG_BUGPOINT 100 InitLLVM X(argc, argv); 101 #endif 102 103 // Initialize passes 104 PassRegistry &Registry = *PassRegistry::getPassRegistry(); 105 initializeCore(Registry); 106 initializeScalarOpts(Registry); 107 initializeVectorization(Registry); 108 initializeIPO(Registry); 109 initializeAnalysis(Registry); 110 initializeTransformUtils(Registry); 111 initializeInstCombine(Registry); 112 initializeTarget(Registry); 113 114 if (std::getenv("bar") == (char*) -1) { 115 InitializeAllTargets(); 116 InitializeAllTargetMCs(); 117 InitializeAllAsmPrinters(); 118 InitializeAllAsmParsers(); 119 } 120 121 cl::ParseCommandLineOptions(argc, argv, 122 "LLVM automatic testcase reducer. See\nhttp://" 123 "llvm.org/cmds/bugpoint.html" 124 " for more information.\n"); 125 #ifndef DEBUG_BUGPOINT 126 sys::SetInterruptFunction(BugpointInterruptFunction); 127 #endif 128 129 LLVMContext Context; 130 // If we have an override, set it and then track the triple we want Modules 131 // to use. 132 if (!OverrideTriple.empty()) { 133 TargetTriple.setTriple(Triple::normalize(OverrideTriple)); 134 outs() << "Override triple set to '" << TargetTriple.getTriple() << "'\n"; 135 } 136 137 if (MemoryLimit < 0) { 138 // Set the default MemoryLimit. Be sure to update the flag's description if 139 // you change this. 140 if (sys::RunningOnValgrind() || UseValgrind) 141 MemoryLimit = 800; 142 else 143 MemoryLimit = 400; 144 #if (LLVM_ADDRESS_SANITIZER_BUILD || LLVM_MEMORY_SANITIZER_BUILD || \ 145 LLVM_THREAD_SANITIZER_BUILD) 146 // Starting from kernel 4.9 memory allocated with mmap is counted against 147 // RLIMIT_DATA. Sanitizers need to allocate tens of terabytes for shadow. 148 MemoryLimit = 0; 149 #endif 150 } 151 152 BugDriver D(argv[0], FindBugs, TimeoutValue, MemoryLimit, UseValgrind, 153 Context); 154 if (D.addSources(InputFilenames)) 155 return 1; 156 157 AddToDriver PM(D); 158 159 for (const PassInfo *PI : PassList) 160 D.addPass(std::string(PI->getPassArgument())); 161 162 // Bugpoint has the ability of generating a plethora of core files, so to 163 // avoid filling up the disk, we prevent it 164 #ifndef DEBUG_BUGPOINT 165 sys::Process::PreventCoreFiles(); 166 #endif 167 168 // Needed to pull in symbols from statically linked extensions, including static 169 // registration. It is unused otherwise because bugpoint has no support for 170 // NewPM. 171 #define HANDLE_EXTENSION(Ext) \ 172 (void)get##Ext##PluginInfo(); 173 #include "llvm/Support/Extension.def" 174 175 if (Error E = D.run()) { 176 errs() << toString(std::move(E)); 177 return 1; 178 } 179 return 0; 180 } 181