ExecutionDriver.cpp revision 367e1ee5bebc3542b55df61cd280bd6166057e51
1//===- ExecutionDriver.cpp - Allow execution of LLVM program --------------===// 2// 3// This file contains code used to execute the program utilizing one of the 4// various ways of running LLVM bytecode. 5// 6//===----------------------------------------------------------------------===// 7 8/* 9BUGPOINT NOTES: 10 111. Bugpoint should not leave any files behind if the program works properly 122. There should be an option to specify the program name, which specifies a 13 unique string to put into output files. This allows operation in the 14 SingleSource directory, e.g. default to the first input filename. 15*/ 16 17#include "BugDriver.h" 18#include "Support/CommandLine.h" 19#include "Support/Debug.h" 20#include "Support/FileUtilities.h" 21#include "Support/SystemUtils.h" 22#include "llvm/Support/ToolRunner.h" 23#include <fstream> 24#include <iostream> 25 26namespace { 27 // OutputType - Allow the user to specify the way code should be run, to test 28 // for miscompilation. 29 // 30 enum OutputType { 31 RunLLI, RunJIT, RunLLC, RunCBE 32 }; 33 34 cl::opt<OutputType> 35 InterpreterSel(cl::desc("Specify how LLVM code should be executed:"), 36 cl::values(clEnumValN(RunLLI, "run-int", "Execute with the interpreter"), 37 clEnumValN(RunJIT, "run-jit", "Execute with JIT"), 38 clEnumValN(RunLLC, "run-llc", "Compile with LLC"), 39 clEnumValN(RunCBE, "run-cbe", "Compile with CBE"), 40 0), 41 cl::init(RunCBE)); 42 43 cl::opt<std::string> 44 InputFile("input", cl::init("/dev/null"), 45 cl::desc("Filename to pipe in as stdin (default: /dev/null)")); 46 47 cl::list<std::string> 48 AdditionalSOs("additional-so", 49 cl::desc("Additional shared objects to load " 50 "into executing programs")); 51} 52 53// Anything specified after the --args option are taken as arguments to the 54// program being debugged. 55cl::list<std::string> 56InputArgv("args", cl::Positional, cl::desc("<program arguments>..."), 57 cl::ZeroOrMore); 58 59//===----------------------------------------------------------------------===// 60// BugDriver method implementation 61// 62 63/// initializeExecutionEnvironment - This method is used to set up the 64/// environment for executing LLVM programs. 65/// 66bool BugDriver::initializeExecutionEnvironment() { 67 std::cout << "Initializing execution environment: "; 68 69 // FIXME: This should default to searching for the best interpreter to use on 70 // this platform, which would be JIT, then LLC, then CBE, then LLI. 71 72 // Create an instance of the AbstractInterpreter interface as specified on 73 // the command line 74 std::string Message; 75 switch (InterpreterSel) { 76 case RunLLI: 77 Interpreter = AbstractInterpreter::createLLI(getToolName(), Message); 78 break; 79 case RunLLC: 80 Interpreter = AbstractInterpreter::createLLC(getToolName(), Message); 81 break; 82 case RunJIT: 83 Interpreter = AbstractInterpreter::createJIT(getToolName(), Message); 84 break; 85 case RunCBE: 86 Interpreter = AbstractInterpreter::createCBE(getToolName(), Message); 87 break; 88 default: 89 Message = "Sorry, this back-end is not supported by bugpoint right now!\n"; 90 break; 91 } 92 std::cerr << Message; 93 94 // Initialize auxiliary tools for debugging 95 cbe = AbstractInterpreter::createCBE(getToolName(), Message); 96 if (!cbe) { std::cout << Message << "\nExiting.\n"; exit(1); } 97 gcc = GCC::create(getToolName(), Message); 98 if (!gcc) { std::cout << Message << "\nExiting.\n"; exit(1); } 99 100 // If there was an error creating the selected interpreter, quit with error. 101 return Interpreter == 0; 102} 103 104 105/// executeProgram - This method runs "Program", capturing the output of the 106/// program to a file, returning the filename of the file. A recommended 107/// filename may be optionally specified. 108/// 109std::string BugDriver::executeProgram(std::string OutputFile, 110 std::string BytecodeFile, 111 const std::string &SharedObj, 112 AbstractInterpreter *AI) { 113 if (AI == 0) AI = Interpreter; 114 assert(AI && "Interpreter should have been created already!"); 115 bool CreatedBytecode = false; 116 if (BytecodeFile.empty()) { 117 // Emit the program to a bytecode file... 118 BytecodeFile = getUniqueFilename("bugpoint-test-program.bc"); 119 120 if (writeProgramToFile(BytecodeFile, Program)) { 121 std::cerr << ToolName << ": Error emitting bytecode to file '" 122 << BytecodeFile << "'!\n"; 123 exit(1); 124 } 125 CreatedBytecode = true; 126 } 127 128 if (OutputFile.empty()) OutputFile = "bugpoint-execution-output"; 129 130 // Check to see if this is a valid output filename... 131 OutputFile = getUniqueFilename(OutputFile); 132 133 // Figure out which shared objects to run, if any. 134 std::vector<std::string> SharedObjs(AdditionalSOs); 135 if (!SharedObj.empty()) 136 SharedObjs.push_back(SharedObj); 137 138 // Actually execute the program! 139 int RetVal = AI->ExecuteProgram(BytecodeFile, InputArgv, InputFile, 140 OutputFile, SharedObjs); 141 142 143 // Remove the temporary bytecode file. 144 if (CreatedBytecode) removeFile(BytecodeFile); 145 146 // Return the filename we captured the output to. 147 return OutputFile; 148} 149 150 151std::string BugDriver::compileSharedObject(const std::string &BytecodeFile) { 152 assert(Interpreter && "Interpreter should have been created already!"); 153 std::string OutputCFile; 154 155 // Using CBE 156 cbe->OutputC(BytecodeFile, OutputCFile); 157 158#if 0 /* This is an alternative, as yet unimplemented */ 159 // Using LLC 160 std::string Message; 161 LLC *llc = createLLCtool(Message); 162 if (llc->OutputAsm(BytecodeFile, OutputFile)) { 163 std::cerr << "Could not generate asm code with `llc', exiting.\n"; 164 exit(1); 165 } 166#endif 167 168 std::string SharedObjectFile; 169 if (gcc->MakeSharedObject(OutputCFile, GCC::CFile, SharedObjectFile)) 170 exit(1); 171 172 // Remove the intermediate C file 173 removeFile(OutputCFile); 174 175 return SharedObjectFile; 176} 177 178 179/// diffProgram - This method executes the specified module and diffs the output 180/// against the file specified by ReferenceOutputFile. If the output is 181/// different, true is returned. 182/// 183bool BugDriver::diffProgram(const std::string &BytecodeFile, 184 const std::string &SharedObject, 185 bool RemoveBytecode) { 186 // Execute the program, generating an output file... 187 std::string Output = executeProgram("", BytecodeFile, SharedObject); 188 189 std::string Error; 190 bool FilesDifferent = false; 191 if (DiffFiles(ReferenceOutputFile, Output, &Error)) { 192 if (!Error.empty()) { 193 std::cerr << "While diffing output: " << Error << "\n"; 194 exit(1); 195 } 196 FilesDifferent = true; 197 } 198 199 if (RemoveBytecode) removeFile(BytecodeFile); 200 return FilesDifferent; 201} 202 203bool BugDriver::isExecutingJIT() { 204 return InterpreterSel == RunJIT; 205} 206