llvm-6502/tools/bugpoint/OptimizerDriver.cpp
2010-08-24 17:44:07 +00:00

261 lines
9.1 KiB
C++

//===- OptimizerDriver.cpp - Allow BugPoint to run passes safely ----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines an interface that allows bugpoint to run various passes
// without the threat of a buggy pass corrupting bugpoint (of course, bugpoint
// may have its own bugs, but that's another story...). It achieves this by
// forking a copy of itself and having the child process do the optimizations.
// If this client dies, we can always fork a new one. :)
//
//===----------------------------------------------------------------------===//
// Note: as a short term hack, the old Unix-specific code and platform-
// independent code co-exist via conditional compilation until it is verified
// that the new code works correctly on Unix.
#include "BugDriver.h"
#include "llvm/Module.h"
#include "llvm/PassManager.h"
#include "llvm/Analysis/Verifier.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Support/FileUtilities.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/SystemUtils.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/System/Path.h"
#include "llvm/System/Program.h"
#define DONT_GET_PLUGIN_LOADER_OPTION
#include "llvm/Support/PluginLoader.h"
#include <fstream>
using namespace llvm;
namespace llvm {
extern cl::opt<std::string> OutputPrefix;
}
namespace {
// ChildOutput - This option captures the name of the child output file that
// is set up by the parent bugpoint process
cl::opt<std::string> ChildOutput("child-output", cl::ReallyHidden);
}
/// writeProgramToFile - This writes the current "Program" to the named bitcode
/// file. If an error occurs, true is returned.
///
bool BugDriver::writeProgramToFile(const std::string &Filename,
const Module *M) const {
std::string ErrInfo;
tool_output_file Out(Filename.c_str(), ErrInfo,
raw_fd_ostream::F_Binary);
if (ErrInfo.empty()) {
WriteBitcodeToFile(M, Out);
Out.close();
if (!Out.has_error()) {
Out.keep();
return false;
}
}
Out.clear_error();
return true;
}
/// EmitProgressBitcode - This function is used to output the current Program
/// to a file named "bugpoint-ID.bc".
///
void BugDriver::EmitProgressBitcode(const Module *M,
const std::string &ID,
bool NoFlyer) const {
// Output the input to the current pass to a bitcode file, emit a message
// telling the user how to reproduce it: opt -foo blah.bc
//
std::string Filename = OutputPrefix + "-" + ID + ".bc";
if (writeProgramToFile(Filename, M)) {
errs() << "Error opening file '" << Filename << "' for writing!\n";
return;
}
outs() << "Emitted bitcode to '" << Filename << "'\n";
if (NoFlyer || PassesToRun.empty()) return;
outs() << "\n*** You can reproduce the problem with: ";
if (UseValgrind) outs() << "valgrind ";
outs() << "opt " << Filename << " ";
outs() << getPassesString(PassesToRun) << "\n";
}
cl::opt<bool> SilencePasses("silence-passes", cl::desc("Suppress output of running passes (both stdout and stderr)"));
static cl::list<std::string> OptArgs("opt-args", cl::Positional,
cl::desc("<opt arguments>..."),
cl::ZeroOrMore, cl::PositionalEatsArgs);
/// runPasses - Run the specified passes on Program, outputting a bitcode file
/// and writing the filename into OutputFile if successful. If the
/// optimizations fail for some reason (optimizer crashes), return true,
/// otherwise return false. If DeleteOutput is set to true, the bitcode is
/// deleted on success, and the filename string is undefined. This prints to
/// outs() a single line message indicating whether compilation was successful
/// or failed.
///
bool BugDriver::runPasses(Module *Program,
const std::vector<std::string> &Passes,
std::string &OutputFilename, bool DeleteOutput,
bool Quiet, unsigned NumExtraArgs,
const char * const *ExtraArgs) const {
// setup the output file name
outs().flush();
sys::Path uniqueFilename(OutputPrefix + "-output.bc");
std::string ErrMsg;
if (uniqueFilename.makeUnique(true, &ErrMsg)) {
errs() << getToolName() << ": Error making unique filename: "
<< ErrMsg << "\n";
return(1);
}
OutputFilename = uniqueFilename.str();
// set up the input file name
sys::Path inputFilename(OutputPrefix + "-input.bc");
if (inputFilename.makeUnique(true, &ErrMsg)) {
errs() << getToolName() << ": Error making unique filename: "
<< ErrMsg << "\n";
return(1);
}
std::string ErrInfo;
tool_output_file InFile(inputFilename.c_str(), ErrInfo,
raw_fd_ostream::F_Binary);
if (!ErrInfo.empty()) {
errs() << "Error opening bitcode file: " << inputFilename.str() << "\n";
return 1;
}
WriteBitcodeToFile(Program, InFile);
InFile.close();
if (InFile.has_error()) {
errs() << "Error writing bitcode file: " << inputFilename.str() << "\n";
InFile.clear_error();
return 1;
}
InFile.keep();
// setup the child process' arguments
SmallVector<const char*, 8> Args;
sys::Path tool = FindExecutable("opt", getToolName(), (void*)"opt");
std::string Opt = tool.str();
if (UseValgrind) {
Args.push_back("valgrind");
Args.push_back("--error-exitcode=1");
Args.push_back("-q");
Args.push_back(tool.c_str());
} else
Args.push_back(Opt.c_str());
Args.push_back("-o");
Args.push_back(OutputFilename.c_str());
for (unsigned i = 0, e = OptArgs.size(); i != e; ++i)
Args.push_back(OptArgs[i].c_str());
std::vector<std::string> pass_args;
for (unsigned i = 0, e = PluginLoader::getNumPlugins(); i != e; ++i) {
pass_args.push_back( std::string("-load"));
pass_args.push_back( PluginLoader::getPlugin(i));
}
for (std::vector<std::string>::const_iterator I = Passes.begin(),
E = Passes.end(); I != E; ++I )
pass_args.push_back( std::string("-") + (*I) );
for (std::vector<std::string>::const_iterator I = pass_args.begin(),
E = pass_args.end(); I != E; ++I )
Args.push_back(I->c_str());
Args.push_back(inputFilename.c_str());
for (unsigned i = 0; i < NumExtraArgs; ++i)
Args.push_back(*ExtraArgs);
Args.push_back(0);
DEBUG(errs() << "\nAbout to run:\t";
for (unsigned i = 0, e = Args.size()-1; i != e; ++i)
errs() << " " << Args[i];
errs() << "\n";
);
sys::Path prog;
if (UseValgrind)
prog = sys::Program::FindProgramByName("valgrind");
else
prog = tool;
// Redirect stdout and stderr to nowhere if SilencePasses is given
sys::Path Nowhere;
const sys::Path *Redirects[3] = {0, &Nowhere, &Nowhere};
int result = sys::Program::ExecuteAndWait(prog, Args.data(), 0,
(SilencePasses ? Redirects : 0),
Timeout, MemoryLimit, &ErrMsg);
// If we are supposed to delete the bitcode file or if the passes crashed,
// remove it now. This may fail if the file was never created, but that's ok.
if (DeleteOutput || result != 0)
sys::Path(OutputFilename).eraseFromDisk();
// Remove the temporary input file as well
inputFilename.eraseFromDisk();
if (!Quiet) {
if (result == 0)
outs() << "Success!\n";
else if (result > 0)
outs() << "Exited with error code '" << result << "'\n";
else if (result < 0) {
if (result == -1)
outs() << "Execute failed: " << ErrMsg << "\n";
else
outs() << "Crashed with signal #" << abs(result) << "\n";
}
if (result & 0x01000000)
outs() << "Dumped core\n";
}
// Was the child successful?
return result != 0;
}
/// runPassesOn - Carefully run the specified set of pass on the specified
/// module, returning the transformed module on success, or a null pointer on
/// failure.
Module *BugDriver::runPassesOn(Module *M,
const std::vector<std::string> &Passes,
bool AutoDebugCrashes, unsigned NumExtraArgs,
const char * const *ExtraArgs) {
std::string BitcodeResult;
if (runPasses(M, Passes, BitcodeResult, false/*delete*/, true/*quiet*/,
NumExtraArgs, ExtraArgs)) {
if (AutoDebugCrashes) {
errs() << " Error running this sequence of passes"
<< " on the input program!\n";
delete swapProgramIn(M);
EmitProgressBitcode(M, "pass-error", false);
exit(debugOptimizerCrash());
}
return 0;
}
Module *Ret = ParseInputFile(BitcodeResult, Context);
if (Ret == 0) {
errs() << getToolName() << ": Error reading bitcode file '"
<< BitcodeResult << "'!\n";
exit(1);
}
sys::Path(BitcodeResult).eraseFromDisk(); // No longer need the file on disk
return Ret;
}