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|
//===- 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.
//
//===----------------------------------------------------------------------===//
/*
BUGPOINT NOTES:
1. Bugpoint should not leave any files behind if the program works properly
2. There should be an option to specify the program name, which specifies a
unique string to put into output files. This allows operation in the
SingleSource directory, e.g. default to the first input filename.
*/
#include "BugDriver.h"
#include "Support/CommandLine.h"
#include "Support/Debug.h"
#include "Support/FileUtilities.h"
#include "Support/SystemUtils.h"
#include "llvm/Support/ToolRunner.h"
#include <fstream>
#include <iostream>
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"),
0),
cl::init(AutoPick));
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"));
}
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);
//===----------------------------------------------------------------------===//
// 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
std::string Message;
switch (InterpreterSel) {
case AutoPick:
InterpreterSel = RunCBE;
Interpreter = AbstractInterpreter::createCBE(getToolName(), Message);
if (!Interpreter) {
InterpreterSel = RunJIT;
Interpreter = AbstractInterpreter::createJIT(getToolName(), Message);
}
if (!Interpreter) {
InterpreterSel = RunLLC;
Interpreter = AbstractInterpreter::createLLC(getToolName(), Message);
}
if (!Interpreter) {
InterpreterSel = RunLLI;
Interpreter = AbstractInterpreter::createLLI(getToolName(), Message);
}
if (!Interpreter) {
InterpreterSel = AutoPick;
Message = "Sorry, I can't automatically select an interpreter!\n";
}
break;
case RunLLI:
Interpreter = AbstractInterpreter::createLLI(getToolName(), Message);
break;
case RunLLC:
Interpreter = AbstractInterpreter::createLLC(getToolName(), Message);
break;
case RunJIT:
Interpreter = AbstractInterpreter::createJIT(getToolName(), Message);
break;
case RunCBE:
Interpreter = AbstractInterpreter::createCBE(getToolName(), Message);
break;
default:
Message = "Sorry, this back-end is not supported by bugpoint right now!\n";
break;
}
std::cerr << Message;
// Initialize auxiliary tools for debugging
cbe = AbstractInterpreter::createCBE(getToolName(), Message);
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;
}
/// 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) {
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;
}
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);
// Remove the temporary bytecode file.
if (CreatedBytecode) removeFile(BytecodeFile);
// Return the filename we captured the output to.
return OutputFile;
}
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) {
// Execute the program, generating an output file...
std::string Output = executeProgram("", BytecodeFile, SharedObject);
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;
}
} // End llvm namespace
|
