ExecutionDriver.cpp [plain text]
#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 {
enum OutputType {
AutoPick, RunLLI, RunJIT, RunLLC, RunLLCIA, RunCBE, CBE_bug, 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(RunCBE, "run-cbe", "Compile with CBE"),
clEnumValN(CBE_bug,"cbe-bug", "Find CBE bugs"),
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(RunCBE, "safe-run-cbe", "Compile with CBE"),
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 {
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);
}
bool BugDriver::initializeExecutionEnvironment() {
outs() << "Initializing execution environment: ";
SafeInterpreter = 0;
std::string Message;
switch (InterpreterSel) {
case AutoPick:
InterpreterSel = RunCBE;
Interpreter =
AbstractInterpreter::createCBE(getToolName(), Message, GCCBinary,
&ToolArgv, &GCCToolArgv);
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 RunCBE:
case CBE_bug:
Interpreter = AbstractInterpreter::createCBE(getToolName(), Message,
GCCBinary, &ToolArgv,
&GCCToolArgv);
break;
case CompileCustom:
Interpreter =
AbstractInterpreter::createCustomCompiler(Message, CustomCompileCommand);
break;
case Custom:
Interpreter =
AbstractInterpreter::createCustomExecutor(Message, CustomExecCommand);
break;
}
if (!Interpreter)
errs() << Message;
else outs() << Message;
std::string Path = SafeInterpreterPath;
if (Path.empty())
Path = getToolName();
std::vector<std::string> SafeToolArgs = SafeToolArgv;
switch (SafeInterpreterSel) {
case AutoPick:
if (!SafeInterpreter &&
InterpreterSel == CBE_bug) {
SafeInterpreterSel = RunLLC;
SafeToolArgs.push_back("--relocation-model=pic");
SafeInterpreter = AbstractInterpreter::createLLC(Path.c_str(), Message,
GCCBinary,
&SafeToolArgs,
&GCCToolArgv);
}
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 != RunCBE) {
SafeInterpreterSel = RunCBE;
SafeInterpreter = AbstractInterpreter::createCBE(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 an 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 RunCBE:
SafeInterpreter = AbstractInterpreter::createCBE(Path.c_str(), Message,
GCCBinary, &SafeToolArgs,
&GCCToolArgv);
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); }
return Interpreter == 0;
}
void BugDriver::compileProgram(Module *M, std::string *Error) const {
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);
}
FileRemover BitcodeFileRemover(BitcodeFile.str(), !SaveTemps);
Interpreter->compileProgram(BitcodeFile.str(), Error, Timeout, MemoryLimit);
}
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()) {
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;
}
sys::Path BitcodePath(BitcodeFile);
FileRemover BitcodeFileRemover(BitcodePath.str(),
CreatedBitcode && !SaveTemps);
if (OutputFile.empty()) OutputFile = OutputPrefix + "-execution-output";
sys::Path uniqueFile(OutputFile);
if (uniqueFile.makeUnique(true, &ErrMsg)) {
errs() << ToolName << ": Error making unique filename: "
<< ErrMsg << "\n";
exit(1);
}
OutputFile = uniqueFile.str();
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 OutputFile;
}
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;
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);
OutputFile.eraseFromDisk();
return "./" + SharedObjectFile;
}
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-cbe bugpoint option,"
<< " if CBE 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;
}
bool BugDriver::diffProgram(const Module *Program,
const std::string &BitcodeFile,
const std::string &SharedObject,
bool RemoveBitcode,
std::string *ErrMsg) const {
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 {
Output.eraseFromDisk();
}
if (RemoveBitcode)
sys::Path(BitcodeFile).eraseFromDisk();
return FilesDifferent;
}
bool BugDriver::isExecutingJIT() {
return InterpreterSel == RunJIT;
}