llvm-6502/tools/bugpoint/ExecutionDriver.cpp

318 lines
11 KiB
C++
Raw Normal View History

//===- ExecutionDriver.cpp - Allow execution of LLVM program --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and 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 bytecode.
//
//===----------------------------------------------------------------------===//
#include "BugDriver.h"
#include "llvm/Support/ToolRunner.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/FileUtilities.h"
#include "llvm/Support/SystemUtils.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, RunCBE
};
cl::opt<OutputType>
InterpreterSel(cl::desc("Specify how LLVM code should be executed:"),
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(RunCBE, "run-cbe", "Compile with CBE"),
clEnumValEnd),
cl::init(AutoPick));
cl::opt<bool>
CheckProgramExitCode("check-exit-code",
cl::desc("Assume nonzero exit code is failure (default on)"),
cl::init(true));
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::opt<unsigned>
TimeoutValue("timeout", cl::init(300), cl::value_desc("seconds"),
cl::desc("Number of seconds program is allowed to run before it "
"is killed (default is 300s), 0 disables timeout"));
}
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::list<std::string>
ToolArgv("tool-args", cl::Positional, cl::desc("<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() {
std::cout << "Initializing execution environment: ";
// Create an instance of the AbstractInterpreter interface as specified on
// the command line
cbe = 0;
std::string Message;
switch (InterpreterSel) {
case AutoPick:
InterpreterSel = RunCBE;
Interpreter = cbe = AbstractInterpreter::createCBE(getToolName(), Message,
&ToolArgv);
if (!Interpreter) {
InterpreterSel = RunJIT;
Interpreter = AbstractInterpreter::createJIT(getToolName(), Message,
&ToolArgv);
}
if (!Interpreter) {
InterpreterSel = RunLLC;
Interpreter = AbstractInterpreter::createLLC(getToolName(), Message,
&ToolArgv);
}
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:
Interpreter = AbstractInterpreter::createLLC(getToolName(), Message,
&ToolArgv);
break;
case RunJIT:
Interpreter = AbstractInterpreter::createJIT(getToolName(), Message,
&ToolArgv);
break;
case RunCBE:
Interpreter = cbe = AbstractInterpreter::createCBE(getToolName(), Message,
&ToolArgv);
break;
default:
Message = "Sorry, this back-end is not supported by bugpoint right now!\n";
break;
}
std::cerr << Message;
// Initialize auxiliary tools for debugging
if (!cbe) {
cbe = AbstractInterpreter::createCBE(getToolName(), Message, &ToolArgv);
if (!cbe) { std::cout << Message << "\nExiting.\n"; exit(1); }
}
gcc = GCC::create(getToolName(), Message);
if (!gcc) { std::cout << 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, throwing an exception
/// if an error occurs, or returning normally if not. This is used for code
/// generation crash testing.
///
void BugDriver::compileProgram(Module *M) {
// Emit the program to a bytecode file...
std::string BytecodeFile = getUniqueFilename("bugpoint-test-program.bc");
if (writeProgramToFile(BytecodeFile, M)) {
std::cerr << ToolName << ": Error emitting bytecode to file '"
<< BytecodeFile << "'!\n";
exit(1);
}
// Remove the temporary bytecode file when we are done.
FileRemover BytecodeFileRemover(BytecodeFile);
// Actually compile the program!
Interpreter->compileProgram(BytecodeFile);
}
/// 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(std::string OutputFile,
std::string BytecodeFile,
const std::string &SharedObj,
AbstractInterpreter *AI,
bool *ProgramExitedNonzero) {
if (AI == 0) AI = Interpreter;
assert(AI && "Interpreter should have been created already!");
bool CreatedBytecode = false;
if (BytecodeFile.empty()) {
// Emit the program to a bytecode file...
BytecodeFile = getUniqueFilename("bugpoint-test-program.bc");
if (writeProgramToFile(BytecodeFile, Program)) {
std::cerr << ToolName << ": Error emitting bytecode to file '"
<< BytecodeFile << "'!\n";
exit(1);
}
CreatedBytecode = true;
}
// Remove the temporary bytecode file when we are done.
FileRemover BytecodeFileRemover(BytecodeFile, CreatedBytecode);
if (OutputFile.empty()) OutputFile = "bugpoint-execution-output";
// Check to see if this is a valid output filename...
OutputFile = getUniqueFilename(OutputFile);
// Figure out which shared objects to run, if any.
std::vector<std::string> SharedObjs(AdditionalSOs);
if (!SharedObj.empty())
SharedObjs.push_back(SharedObj);
// Actually execute the program!
int RetVal = AI->ExecuteProgram(BytecodeFile, InputArgv, InputFile,
OutputFile, SharedObjs, TimeoutValue);
if (RetVal == -1) {
std::cerr << "<timeout>";
static bool FirstTimeout = true;
if (FirstTimeout) {
std::cout << "\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 (ProgramExitedNonzero != 0)
*ProgramExitedNonzero = (RetVal != 0);
// Return the filename we captured the output to.
return OutputFile;
}
/// executeProgramWithCBE - Used to create reference output with the C
/// backend, if reference output is not provided.
///
std::string BugDriver::executeProgramWithCBE(std::string OutputFile) {
bool ProgramExitedNonzero;
std::string outFN = executeProgram(OutputFile, "", "",
(AbstractInterpreter*)cbe,
&ProgramExitedNonzero);
if (ProgramExitedNonzero) {
std::cerr
<< "Warning: While generating reference output, program exited with\n"
<< "non-zero exit code. This will NOT be treated as a failure.\n";
CheckProgramExitCode = false;
}
return outFN;
}
std::string BugDriver::compileSharedObject(const std::string &BytecodeFile) {
assert(Interpreter && "Interpreter should have been created already!");
std::string OutputCFile;
// Using CBE
cbe->OutputC(BytecodeFile, OutputCFile);
#if 0 /* This is an alternative, as yet unimplemented */
// Using LLC
std::string Message;
LLC *llc = createLLCtool(Message);
if (llc->OutputAsm(BytecodeFile, OutputFile)) {
std::cerr << "Could not generate asm code with `llc', exiting.\n";
exit(1);
}
#endif
std::string SharedObjectFile;
if (gcc->MakeSharedObject(OutputCFile, GCC::CFile, SharedObjectFile))
exit(1);
// Remove the intermediate C file
removeFile(OutputCFile);
return "./" + SharedObjectFile;
}
/// diffProgram - This method executes the specified module and diffs the output
/// against the file specified by ReferenceOutputFile. If the output is
/// different, true is returned.
///
bool BugDriver::diffProgram(const std::string &BytecodeFile,
const std::string &SharedObject,
bool RemoveBytecode) {
bool ProgramExitedNonzero;
// Execute the program, generating an output file...
std::string Output = executeProgram("", BytecodeFile, SharedObject, 0,
&ProgramExitedNonzero);
// If we're checking the program exit code, assume anything nonzero is bad.
if (CheckProgramExitCode && ProgramExitedNonzero) {
removeFile(Output);
if (RemoveBytecode) removeFile(BytecodeFile);
return true;
}
std::string Error;
bool FilesDifferent = false;
if (DiffFiles(ReferenceOutputFile, Output, &Error)) {
if (!Error.empty()) {
std::cerr << "While diffing output: " << Error << '\n';
exit(1);
}
FilesDifferent = true;
}
// Remove the generated output.
removeFile(Output);
// Remove the bytecode file if we are supposed to.
if (RemoveBytecode) removeFile(BytecodeFile);
return FilesDifferent;
}
bool BugDriver::isExecutingJIT() {
return InterpreterSel == RunJIT;
}