| //===- ExecutionDriver.cpp - Allow execution of LLVM program --------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file contains code used to execute the program utilizing one of the |
| // various ways of running LLVM bitcode. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "BugDriver.h" |
| #include "ToolRunner.h" |
| #include "llvm/Support/CommandLine.h" |
| #include "llvm/Support/Debug.h" |
| #include "llvm/Support/FileUtilities.h" |
| #include "llvm/Support/SystemUtils.h" |
| #include "llvm/Support/raw_ostream.h" |
| #include <fstream> |
| |
| using namespace llvm; |
| |
| namespace { |
| // OutputType - Allow the user to specify the way code should be run, to test |
| // for miscompilation. |
| // |
| enum OutputType { |
| AutoPick, RunLLI, RunJIT, RunLLC, RunLLCIA, LLC_Safe, CompileCustom, Custom |
| }; |
| |
| cl::opt<double> |
| AbsTolerance("abs-tolerance", cl::desc("Absolute error tolerated"), |
| cl::init(0.0)); |
| cl::opt<double> |
| RelTolerance("rel-tolerance", cl::desc("Relative error tolerated"), |
| cl::init(0.0)); |
| |
| cl::opt<OutputType> |
| InterpreterSel(cl::desc("Specify the \"test\" i.e. suspect back-end:"), |
| cl::values(clEnumValN(AutoPick, "auto", "Use best guess"), |
| clEnumValN(RunLLI, "run-int", |
| "Execute with the interpreter"), |
| clEnumValN(RunJIT, "run-jit", "Execute with JIT"), |
| clEnumValN(RunLLC, "run-llc", "Compile with LLC"), |
| clEnumValN(RunLLCIA, "run-llc-ia", |
| "Compile with LLC with integrated assembler"), |
| clEnumValN(LLC_Safe, "llc-safe", "Use LLC for all"), |
| clEnumValN(CompileCustom, "compile-custom", |
| "Use -compile-command to define a command to " |
| "compile the bitcode. Useful to avoid linking."), |
| clEnumValN(Custom, "run-custom", |
| "Use -exec-command to define a command to execute " |
| "the bitcode. Useful for cross-compilation."), |
| clEnumValEnd), |
| cl::init(AutoPick)); |
| |
| cl::opt<OutputType> |
| SafeInterpreterSel(cl::desc("Specify \"safe\" i.e. known-good backend:"), |
| cl::values(clEnumValN(AutoPick, "safe-auto", "Use best guess"), |
| clEnumValN(RunLLC, "safe-run-llc", "Compile with LLC"), |
| clEnumValN(Custom, "safe-run-custom", |
| "Use -exec-command to define a command to execute " |
| "the bitcode. Useful for cross-compilation."), |
| clEnumValEnd), |
| cl::init(AutoPick)); |
| |
| cl::opt<std::string> |
| SafeInterpreterPath("safe-path", |
| cl::desc("Specify the path to the \"safe\" backend program"), |
| cl::init("")); |
| |
| cl::opt<bool> |
| AppendProgramExitCode("append-exit-code", |
| cl::desc("Append the exit code to the output so it gets diff'd too"), |
| cl::init(false)); |
| |
| cl::opt<std::string> |
| InputFile("input", cl::init("/dev/null"), |
| cl::desc("Filename to pipe in as stdin (default: /dev/null)")); |
| |
| cl::list<std::string> |
| AdditionalSOs("additional-so", |
| cl::desc("Additional shared objects to load " |
| "into executing programs")); |
| |
| cl::list<std::string> |
| AdditionalLinkerArgs("Xlinker", |
| cl::desc("Additional arguments to pass to the linker")); |
| |
| cl::opt<std::string> |
| CustomCompileCommand("compile-command", cl::init("llc"), |
| cl::desc("Command to compile the bitcode (use with -compile-custom) " |
| "(default: llc)")); |
| |
| cl::opt<std::string> |
| CustomExecCommand("exec-command", cl::init("simulate"), |
| cl::desc("Command to execute the bitcode (use with -run-custom) " |
| "(default: simulate)")); |
| } |
| |
| namespace llvm { |
| // Anything specified after the --args option are taken as arguments to the |
| // program being debugged. |
| cl::list<std::string> |
| InputArgv("args", cl::Positional, cl::desc("<program arguments>..."), |
| cl::ZeroOrMore, cl::PositionalEatsArgs); |
| |
| cl::opt<std::string> |
| OutputPrefix("output-prefix", cl::init("bugpoint"), |
| cl::desc("Prefix to use for outputs (default: 'bugpoint')")); |
| } |
| |
| namespace { |
| cl::list<std::string> |
| ToolArgv("tool-args", cl::Positional, cl::desc("<tool arguments>..."), |
| cl::ZeroOrMore, cl::PositionalEatsArgs); |
| |
| cl::list<std::string> |
| SafeToolArgv("safe-tool-args", cl::Positional, |
| cl::desc("<safe-tool arguments>..."), |
| cl::ZeroOrMore, cl::PositionalEatsArgs); |
| |
| cl::opt<std::string> |
| GCCBinary("gcc", cl::init("gcc"), |
| cl::desc("The gcc binary to use. (default 'gcc')")); |
| |
| cl::list<std::string> |
| GCCToolArgv("gcc-tool-args", cl::Positional, |
| cl::desc("<gcc-tool arguments>..."), |
| cl::ZeroOrMore, cl::PositionalEatsArgs); |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // BugDriver method implementation |
| // |
| |
| /// initializeExecutionEnvironment - This method is used to set up the |
| /// environment for executing LLVM programs. |
| /// |
| bool BugDriver::initializeExecutionEnvironment() { |
| outs() << "Initializing execution environment: "; |
| |
| // Create an instance of the AbstractInterpreter interface as specified on |
| // the command line |
| SafeInterpreter = 0; |
| std::string Message; |
| |
| switch (InterpreterSel) { |
| case AutoPick: |
| if (!Interpreter) { |
| InterpreterSel = RunJIT; |
| Interpreter = AbstractInterpreter::createJIT(getToolName(), Message, |
| &ToolArgv); |
| } |
| if (!Interpreter) { |
| InterpreterSel = RunLLC; |
| Interpreter = AbstractInterpreter::createLLC(getToolName(), Message, |
| GCCBinary, &ToolArgv, |
| &GCCToolArgv); |
| } |
| if (!Interpreter) { |
| InterpreterSel = RunLLI; |
| Interpreter = AbstractInterpreter::createLLI(getToolName(), Message, |
| &ToolArgv); |
| } |
| if (!Interpreter) { |
| InterpreterSel = AutoPick; |
| Message = "Sorry, I can't automatically select an interpreter!\n"; |
| } |
| break; |
| case RunLLI: |
| Interpreter = AbstractInterpreter::createLLI(getToolName(), Message, |
| &ToolArgv); |
| break; |
| case RunLLC: |
| case RunLLCIA: |
| case LLC_Safe: |
| Interpreter = AbstractInterpreter::createLLC(getToolName(), Message, |
| GCCBinary, &ToolArgv, |
| &GCCToolArgv, |
| InterpreterSel == RunLLCIA); |
| break; |
| case RunJIT: |
| Interpreter = AbstractInterpreter::createJIT(getToolName(), Message, |
| &ToolArgv); |
| break; |
| case CompileCustom: |
| Interpreter = |
| AbstractInterpreter::createCustomCompiler(Message, CustomCompileCommand); |
| break; |
| case Custom: |
| Interpreter = |
| AbstractInterpreter::createCustomExecutor(Message, CustomExecCommand); |
| break; |
| } |
| if (!Interpreter) |
| errs() << Message; |
| else // Display informational messages on stdout instead of stderr |
| outs() << Message; |
| |
| std::string Path = SafeInterpreterPath; |
| if (Path.empty()) |
| Path = getToolName(); |
| std::vector<std::string> SafeToolArgs = SafeToolArgv; |
| switch (SafeInterpreterSel) { |
| case AutoPick: |
| // In "llc-safe" mode, default to using LLC as the "safe" backend. |
| if (!SafeInterpreter && |
| InterpreterSel == LLC_Safe) { |
| SafeInterpreterSel = RunLLC; |
| SafeToolArgs.push_back("--relocation-model=pic"); |
| SafeInterpreter = AbstractInterpreter::createLLC(Path.c_str(), Message, |
| GCCBinary, |
| &SafeToolArgs, |
| &GCCToolArgv); |
| } |
| |
| if (!SafeInterpreter && |
| InterpreterSel != RunLLC && |
| InterpreterSel != RunJIT) { |
| SafeInterpreterSel = RunLLC; |
| SafeToolArgs.push_back("--relocation-model=pic"); |
| SafeInterpreter = AbstractInterpreter::createLLC(Path.c_str(), Message, |
| GCCBinary, |
| &SafeToolArgs, |
| &GCCToolArgv); |
| } |
| if (!SafeInterpreter) { |
| SafeInterpreterSel = AutoPick; |
| Message = "Sorry, I can't automatically select a safe interpreter!\n"; |
| } |
| break; |
| case RunLLC: |
| case RunLLCIA: |
| SafeToolArgs.push_back("--relocation-model=pic"); |
| SafeInterpreter = AbstractInterpreter::createLLC(Path.c_str(), Message, |
| GCCBinary, &SafeToolArgs, |
| &GCCToolArgv, |
| SafeInterpreterSel == RunLLCIA); |
| break; |
| case Custom: |
| SafeInterpreter = |
| AbstractInterpreter::createCustomExecutor(Message, CustomExecCommand); |
| break; |
| default: |
| Message = "Sorry, this back-end is not supported by bugpoint as the " |
| "\"safe\" backend right now!\n"; |
| break; |
| } |
| if (!SafeInterpreter) { outs() << Message << "\nExiting.\n"; exit(1); } |
| |
| gcc = GCC::create(Message, GCCBinary, &GCCToolArgv); |
| if (!gcc) { outs() << Message << "\nExiting.\n"; exit(1); } |
| |
| // If there was an error creating the selected interpreter, quit with error. |
| return Interpreter == 0; |
| } |
| |
| /// compileProgram - Try to compile the specified module, returning false and |
| /// setting Error if an error occurs. This is used for code generation |
| /// crash testing. |
| /// |
| void BugDriver::compileProgram(Module *M, std::string *Error) const { |
| // Emit the program to a bitcode file... |
| sys::Path BitcodeFile (OutputPrefix + "-test-program.bc"); |
| std::string ErrMsg; |
| if (BitcodeFile.makeUnique(true, &ErrMsg)) { |
| errs() << ToolName << ": Error making unique filename: " << ErrMsg |
| << "\n"; |
| exit(1); |
| } |
| if (writeProgramToFile(BitcodeFile.str(), M)) { |
| errs() << ToolName << ": Error emitting bitcode to file '" |
| << BitcodeFile.str() << "'!\n"; |
| exit(1); |
| } |
| |
| // Remove the temporary bitcode file when we are done. |
| FileRemover BitcodeFileRemover(BitcodeFile.str(), !SaveTemps); |
| |
| // Actually compile the program! |
| Interpreter->compileProgram(BitcodeFile.str(), Error, Timeout, MemoryLimit); |
| } |
| |
| |
| /// executeProgram - This method runs "Program", capturing the output of the |
| /// program to a file, returning the filename of the file. A recommended |
| /// filename may be optionally specified. |
| /// |
| std::string BugDriver::executeProgram(const Module *Program, |
| std::string OutputFile, |
| std::string BitcodeFile, |
| const std::string &SharedObj, |
| AbstractInterpreter *AI, |
| std::string *Error) const { |
| if (AI == 0) AI = Interpreter; |
| assert(AI && "Interpreter should have been created already!"); |
| bool CreatedBitcode = false; |
| std::string ErrMsg; |
| if (BitcodeFile.empty()) { |
| // Emit the program to a bitcode file... |
| sys::Path uniqueFilename(OutputPrefix + "-test-program.bc"); |
| if (uniqueFilename.makeUnique(true, &ErrMsg)) { |
| errs() << ToolName << ": Error making unique filename: " |
| << ErrMsg << "!\n"; |
| exit(1); |
| } |
| BitcodeFile = uniqueFilename.str(); |
| |
| if (writeProgramToFile(BitcodeFile, Program)) { |
| errs() << ToolName << ": Error emitting bitcode to file '" |
| << BitcodeFile << "'!\n"; |
| exit(1); |
| } |
| CreatedBitcode = true; |
| } |
| |
| // Remove the temporary bitcode file when we are done. |
| sys::Path BitcodePath(BitcodeFile); |
| FileRemover BitcodeFileRemover(BitcodePath.str(), |
| CreatedBitcode && !SaveTemps); |
| |
| if (OutputFile.empty()) OutputFile = OutputPrefix + "-execution-output"; |
| |
| // Check to see if this is a valid output filename... |
| sys::Path uniqueFile(OutputFile); |
| if (uniqueFile.makeUnique(true, &ErrMsg)) { |
| errs() << ToolName << ": Error making unique filename: " |
| << ErrMsg << "\n"; |
| exit(1); |
| } |
| OutputFile = uniqueFile.str(); |
| |
| // Figure out which shared objects to run, if any. |
| std::vector<std::string> SharedObjs(AdditionalSOs); |
| if (!SharedObj.empty()) |
| SharedObjs.push_back(SharedObj); |
| |
| int RetVal = AI->ExecuteProgram(BitcodeFile, InputArgv, InputFile, OutputFile, |
| Error, AdditionalLinkerArgs, SharedObjs, |
| Timeout, MemoryLimit); |
| if (!Error->empty()) |
| return OutputFile; |
| |
| if (RetVal == -1) { |
| errs() << "<timeout>"; |
| static bool FirstTimeout = true; |
| if (FirstTimeout) { |
| outs() << "\n" |
| "*** Program execution timed out! This mechanism is designed to handle\n" |
| " programs stuck in infinite loops gracefully. The -timeout option\n" |
| " can be used to change the timeout threshold or disable it completely\n" |
| " (with -timeout=0). This message is only displayed once.\n"; |
| FirstTimeout = false; |
| } |
| } |
| |
| if (AppendProgramExitCode) { |
| std::ofstream outFile(OutputFile.c_str(), std::ios_base::app); |
| outFile << "exit " << RetVal << '\n'; |
| outFile.close(); |
| } |
| |
| // Return the filename we captured the output to. |
| return OutputFile; |
| } |
| |
| /// executeProgramSafely - Used to create reference output with the "safe" |
| /// backend, if reference output is not provided. |
| /// |
| std::string BugDriver::executeProgramSafely(const Module *Program, |
| std::string OutputFile, |
| std::string *Error) const { |
| return executeProgram(Program, OutputFile, "", "", SafeInterpreter, Error); |
| } |
| |
| std::string BugDriver::compileSharedObject(const std::string &BitcodeFile, |
| std::string &Error) { |
| assert(Interpreter && "Interpreter should have been created already!"); |
| sys::Path OutputFile; |
| |
| // Using the known-good backend. |
| GCC::FileType FT = SafeInterpreter->OutputCode(BitcodeFile, OutputFile, |
| Error); |
| if (!Error.empty()) |
| return ""; |
| |
| std::string SharedObjectFile; |
| bool Failure = gcc->MakeSharedObject(OutputFile.str(), FT, SharedObjectFile, |
| AdditionalLinkerArgs, Error); |
| if (!Error.empty()) |
| return ""; |
| if (Failure) |
| exit(1); |
| |
| // Remove the intermediate C file |
| OutputFile.eraseFromDisk(); |
| |
| return "./" + SharedObjectFile; |
| } |
| |
| /// createReferenceFile - calls compileProgram and then records the output |
| /// into ReferenceOutputFile. Returns true if reference file created, false |
| /// otherwise. Note: initializeExecutionEnvironment should be called BEFORE |
| /// this function. |
| /// |
| bool BugDriver::createReferenceFile(Module *M, const std::string &Filename) { |
| std::string Error; |
| compileProgram(Program, &Error); |
| if (!Error.empty()) |
| return false; |
| |
| ReferenceOutputFile = executeProgramSafely(Program, Filename, &Error); |
| if (!Error.empty()) { |
| errs() << Error; |
| if (Interpreter != SafeInterpreter) { |
| errs() << "*** There is a bug running the \"safe\" backend. Either" |
| << " debug it (for example with the -run-jit bugpoint option," |
| << " if JIT is being used as the \"safe\" backend), or fix the" |
| << " error some other way.\n"; |
| } |
| return false; |
| } |
| outs() << "\nReference output is: " << ReferenceOutputFile << "\n\n"; |
| return true; |
| } |
| |
| /// diffProgram - This method executes the specified module and diffs the |
| /// output against the file specified by ReferenceOutputFile. If the output |
| /// is different, 1 is returned. If there is a problem with the code |
| /// generator (e.g., llc crashes), this will set ErrMsg. |
| /// |
| bool BugDriver::diffProgram(const Module *Program, |
| const std::string &BitcodeFile, |
| const std::string &SharedObject, |
| bool RemoveBitcode, |
| std::string *ErrMsg) const { |
| // Execute the program, generating an output file... |
| sys::Path Output(executeProgram(Program, "", BitcodeFile, SharedObject, 0, |
| ErrMsg)); |
| if (!ErrMsg->empty()) |
| return false; |
| |
| std::string Error; |
| bool FilesDifferent = false; |
| if (int Diff = DiffFilesWithTolerance(sys::Path(ReferenceOutputFile), |
| sys::Path(Output.str()), |
| AbsTolerance, RelTolerance, &Error)) { |
| if (Diff == 2) { |
| errs() << "While diffing output: " << Error << '\n'; |
| exit(1); |
| } |
| FilesDifferent = true; |
| } |
| else { |
| // Remove the generated output if there are no differences. |
| Output.eraseFromDisk(); |
| } |
| |
| // Remove the bitcode file if we are supposed to. |
| if (RemoveBitcode) |
| sys::Path(BitcodeFile).eraseFromDisk(); |
| return FilesDifferent; |
| } |
| |
| bool BugDriver::isExecutingJIT() { |
| return InterpreterSel == RunJIT; |
| } |
| |
