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293 lines
9.8 KiB
C++
293 lines
9.8 KiB
C++
//===- ExecutionDriver.cpp - Allow execution of LLVM program --------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains code used to execute the program utilizing one of the
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// various ways of running LLVM bytecode.
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//
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//===----------------------------------------------------------------------===//
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/*
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BUGPOINT NOTES:
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1. Bugpoint should not leave any files behind if the program works properly
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2. There should be an option to specify the program name, which specifies a
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unique string to put into output files. This allows operation in the
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SingleSource directory, e.g. default to the first input filename.
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*/
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#include "BugDriver.h"
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#include "Support/CommandLine.h"
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#include "Support/Debug.h"
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#include "Support/FileUtilities.h"
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#include "Support/SystemUtils.h"
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#include "llvm/Support/ToolRunner.h"
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#include <fstream>
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#include <iostream>
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using namespace llvm;
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namespace {
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// OutputType - Allow the user to specify the way code should be run, to test
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// for miscompilation.
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//
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enum OutputType {
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AutoPick, RunLLI, RunJIT, RunLLC, RunCBE
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};
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cl::opt<OutputType>
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InterpreterSel(cl::desc("Specify how LLVM code should be executed:"),
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cl::values(clEnumValN(AutoPick, "auto", "Use best guess"),
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clEnumValN(RunLLI, "run-int", "Execute with the interpreter"),
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clEnumValN(RunJIT, "run-jit", "Execute with JIT"),
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clEnumValN(RunLLC, "run-llc", "Compile with LLC"),
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clEnumValN(RunCBE, "run-cbe", "Compile with CBE"),
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0),
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cl::init(AutoPick));
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cl::opt<bool>
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CheckProgramExitCode("check-exit-code",
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cl::desc("Assume nonzero exit code is failure (default on)"),
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cl::init(true));
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cl::opt<std::string>
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InputFile("input", cl::init("/dev/null"),
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cl::desc("Filename to pipe in as stdin (default: /dev/null)"));
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cl::list<std::string>
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AdditionalSOs("additional-so",
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cl::desc("Additional shared objects to load "
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"into executing programs"));
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}
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namespace llvm {
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// Anything specified after the --args option are taken as arguments to the
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// program being debugged.
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cl::list<std::string>
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InputArgv("args", cl::Positional, cl::desc("<program arguments>..."),
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cl::ZeroOrMore);
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}
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//===----------------------------------------------------------------------===//
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// BugDriver method implementation
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//
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/// initializeExecutionEnvironment - This method is used to set up the
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/// environment for executing LLVM programs.
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///
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bool BugDriver::initializeExecutionEnvironment() {
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std::cout << "Initializing execution environment: ";
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// Create an instance of the AbstractInterpreter interface as specified on
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// the command line
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cbe = 0;
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std::string Message;
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switch (InterpreterSel) {
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case AutoPick:
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InterpreterSel = RunCBE;
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Interpreter = cbe = AbstractInterpreter::createCBE(getToolName(), Message);
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if (!Interpreter) {
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InterpreterSel = RunJIT;
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Interpreter = AbstractInterpreter::createJIT(getToolName(), Message);
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}
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if (!Interpreter) {
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InterpreterSel = RunLLC;
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Interpreter = AbstractInterpreter::createLLC(getToolName(), Message);
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}
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if (!Interpreter) {
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InterpreterSel = RunLLI;
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Interpreter = AbstractInterpreter::createLLI(getToolName(), Message);
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}
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if (!Interpreter) {
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InterpreterSel = AutoPick;
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Message = "Sorry, I can't automatically select an interpreter!\n";
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}
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break;
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case RunLLI:
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Interpreter = AbstractInterpreter::createLLI(getToolName(), Message);
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break;
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case RunLLC:
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Interpreter = AbstractInterpreter::createLLC(getToolName(), Message);
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break;
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case RunJIT:
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Interpreter = AbstractInterpreter::createJIT(getToolName(), Message);
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break;
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case RunCBE:
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Interpreter = cbe = AbstractInterpreter::createCBE(getToolName(), Message);
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break;
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default:
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Message = "Sorry, this back-end is not supported by bugpoint right now!\n";
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break;
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}
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std::cerr << Message;
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// Initialize auxiliary tools for debugging
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if (!cbe) {
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cbe = AbstractInterpreter::createCBE(getToolName(), Message);
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if (!cbe) { std::cout << Message << "\nExiting.\n"; exit(1); }
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}
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gcc = GCC::create(getToolName(), Message);
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if (!gcc) { std::cout << Message << "\nExiting.\n"; exit(1); }
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// If there was an error creating the selected interpreter, quit with error.
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return Interpreter == 0;
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}
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/// compileProgram - Try to compile the specified module, throwing an exception
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/// if an error occurs, or returning normally if not. This is used for code
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/// generation crash testing.
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///
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void BugDriver::compileProgram(Module *M) {
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// Emit the program to a bytecode file...
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std::string BytecodeFile = getUniqueFilename("bugpoint-test-program.bc");
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if (writeProgramToFile(BytecodeFile, M)) {
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std::cerr << ToolName << ": Error emitting bytecode to file '"
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<< BytecodeFile << "'!\n";
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exit(1);
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}
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// Remove the temporary bytecode file when we are done.
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FileRemover BytecodeFileRemover(BytecodeFile);
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// Actually compile the program!
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Interpreter->compileProgram(BytecodeFile);
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}
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/// executeProgram - This method runs "Program", capturing the output of the
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/// program to a file, returning the filename of the file. A recommended
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/// filename may be optionally specified.
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///
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std::string BugDriver::executeProgram(std::string OutputFile,
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std::string BytecodeFile,
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const std::string &SharedObj,
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AbstractInterpreter *AI,
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bool *ProgramExitedNonzero) {
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if (AI == 0) AI = Interpreter;
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assert(AI && "Interpreter should have been created already!");
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bool CreatedBytecode = false;
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if (BytecodeFile.empty()) {
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// Emit the program to a bytecode file...
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BytecodeFile = getUniqueFilename("bugpoint-test-program.bc");
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if (writeProgramToFile(BytecodeFile, Program)) {
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std::cerr << ToolName << ": Error emitting bytecode to file '"
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<< BytecodeFile << "'!\n";
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exit(1);
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}
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CreatedBytecode = true;
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}
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// Remove the temporary bytecode file when we are done.
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FileRemover BytecodeFileRemover(BytecodeFile, CreatedBytecode);
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if (OutputFile.empty()) OutputFile = "bugpoint-execution-output";
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// Check to see if this is a valid output filename...
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OutputFile = getUniqueFilename(OutputFile);
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// Figure out which shared objects to run, if any.
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std::vector<std::string> SharedObjs(AdditionalSOs);
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if (!SharedObj.empty())
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SharedObjs.push_back(SharedObj);
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// Actually execute the program!
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int RetVal = AI->ExecuteProgram(BytecodeFile, InputArgv, InputFile,
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OutputFile, SharedObjs);
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if (ProgramExitedNonzero != 0)
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*ProgramExitedNonzero = (RetVal != 0);
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// Return the filename we captured the output to.
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return OutputFile;
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}
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/// executeProgramWithCBE - Used to create reference output with the C
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/// backend, if reference output is not provided.
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///
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std::string BugDriver::executeProgramWithCBE(std::string OutputFile) {
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bool ProgramExitedNonzero;
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std::string outFN = executeProgram(OutputFile, "", "",
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(AbstractInterpreter*)cbe,
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&ProgramExitedNonzero);
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if (ProgramExitedNonzero) {
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std::cerr
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<< "Warning: While generating reference output, program exited with\n"
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<< "non-zero exit code. This will NOT be treated as a failure.\n";
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CheckProgramExitCode = false;
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}
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return outFN;
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}
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std::string BugDriver::compileSharedObject(const std::string &BytecodeFile) {
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assert(Interpreter && "Interpreter should have been created already!");
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std::string OutputCFile;
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// Using CBE
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cbe->OutputC(BytecodeFile, OutputCFile);
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#if 0 /* This is an alternative, as yet unimplemented */
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// Using LLC
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std::string Message;
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LLC *llc = createLLCtool(Message);
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if (llc->OutputAsm(BytecodeFile, OutputFile)) {
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std::cerr << "Could not generate asm code with `llc', exiting.\n";
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exit(1);
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}
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#endif
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std::string SharedObjectFile;
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if (gcc->MakeSharedObject(OutputCFile, GCC::CFile, SharedObjectFile))
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exit(1);
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// Remove the intermediate C file
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removeFile(OutputCFile);
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return "./" + SharedObjectFile;
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}
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/// diffProgram - This method executes the specified module and diffs the output
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/// against the file specified by ReferenceOutputFile. If the output is
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/// different, true is returned.
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///
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bool BugDriver::diffProgram(const std::string &BytecodeFile,
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const std::string &SharedObject,
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bool RemoveBytecode) {
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bool ProgramExitedNonzero;
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// Execute the program, generating an output file...
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std::string Output = executeProgram("", BytecodeFile, SharedObject, 0,
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&ProgramExitedNonzero);
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// If we're checking the program exit code, assume anything nonzero is bad.
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if (CheckProgramExitCode && ProgramExitedNonzero)
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return true;
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std::string Error;
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bool FilesDifferent = false;
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if (DiffFiles(ReferenceOutputFile, Output, &Error)) {
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if (!Error.empty()) {
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std::cerr << "While diffing output: " << Error << "\n";
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exit(1);
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}
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FilesDifferent = true;
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}
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// Remove the generated output.
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removeFile(Output);
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// Remove the bytecode file if we are supposed to.
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if (RemoveBytecode) removeFile(BytecodeFile);
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return FilesDifferent;
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}
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bool BugDriver::isExecutingJIT() {
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return InterpreterSel == RunJIT;
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}
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