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//===- OptimizerDriver.cpp - Allow BugPoint to run passes safely ----------===//
//
// 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 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/Streams.h"
#include "llvm/System/Path.h"
#include "llvm/System/Program.h"
#include "llvm/Config/alloca.h"
#define DONT_GET_PLUGIN_LOADER_OPTION
#include "llvm/Support/PluginLoader.h"
#include <fstream>
using namespace llvm;
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);
cl::opt<bool> UseValgrind("enable-valgrind",
cl::desc("Run optimizations through valgrind"));
}
/// writeProgramToFile - This writes the current "Program" to the named bytecode
/// file. If an error occurs, true is returned.
///
bool BugDriver::writeProgramToFile(const std::string &Filename,
Module *M) const {
std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
std::ios::binary;
std::ofstream Out(Filename.c_str(), io_mode);
if (!Out.good()) return true;
WriteBitcodeToFile(M ? M : Program, Out);
return false;
}
/// EmitProgressBytecode - This function is used to output the current Program
/// to a file named "bugpoint-ID.bc".
///
void BugDriver::EmitProgressBytecode(const std::string &ID, bool NoFlyer) {
// Output the input to the current pass to a bytecode file, emit a message
// telling the user how to reproduce it: opt -foo blah.bc
//
std::string Filename = "bugpoint-" + ID + ".bc";
if (writeProgramToFile(Filename)) {
cerr << "Error opening file '" << Filename << "' for writing!\n";
return;
}
cout << "Emitted bytecode to '" << Filename << "'\n";
if (NoFlyer || PassesToRun.empty()) return;
cout << "\n*** You can reproduce the problem with: ";
cout << "opt " << Filename << " ";
cout << getPassesString(PassesToRun) << "\n";
}
int BugDriver::runPassesAsChild(const std::vector<const PassInfo*> &Passes) {
std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
std::ios::binary;
std::ofstream OutFile(ChildOutput.c_str(), io_mode);
if (!OutFile.good()) {
cerr << "Error opening bytecode file: " << ChildOutput << "\n";
return 1;
}
PassManager PM;
// Make sure that the appropriate target data is always used...
PM.add(new TargetData(Program));
for (unsigned i = 0, e = Passes.size(); i != e; ++i) {
if (Passes[i]->getNormalCtor())
PM.add(Passes[i]->getNormalCtor()());
else
cerr << "Cannot create pass yet: " << Passes[i]->getPassName() << "\n";
}
// Check that the module is well formed on completion of optimization
PM.add(createVerifierPass());
// Write bytecode out to disk as the last step...
PM.add(CreateBitcodeWriterPass(OutFile));
// Run all queued passes.
PM.run(*Program);
return 0;
}
/// runPasses - Run the specified passes on Program, outputting a bytecode 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 bytecode is
/// deleted on success, and the filename string is undefined. This prints to
/// cout a single line message indicating whether compilation was successful or
/// failed.
///
bool BugDriver::runPasses(const std::vector<const PassInfo*> &Passes,
std::string &OutputFilename, bool DeleteOutput,
bool Quiet) const {
// setup the output file name
cout << std::flush;
sys::Path uniqueFilename("bugpoint-output.bc");
std::string ErrMsg;
if (uniqueFilename.makeUnique(true, &ErrMsg)) {
cerr << getToolName() << ": Error making unique filename: "
<< ErrMsg << "\n";
return(1);
}
OutputFilename = uniqueFilename.toString();
// set up the input file name
sys::Path inputFilename("bugpoint-input.bc");
if (inputFilename.makeUnique(true, &ErrMsg)) {
cerr << getToolName() << ": Error making unique filename: "
<< ErrMsg << "\n";
return(1);
}
std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
std::ios::binary;
std::ofstream InFile(inputFilename.c_str(), io_mode);
if (!InFile.good()) {
cerr << "Error opening bytecode file: " << inputFilename << "\n";
return(1);
}
WriteBitcodeToFile(Program, InFile);
InFile.close();
// setup the child process' arguments
const char** args = (const char**)
alloca(sizeof(const char*) *
(Passes.size()+13+2*PluginLoader::getNumPlugins()));
int n = 0;
sys::Path tool = sys::Program::FindProgramByName(ToolName);
if (UseValgrind) {
args[n++] = "valgrind";
args[n++] = "--error-exitcode=1";
args[n++] = "-q";
args[n++] = tool.c_str();
} else
args[n++] = ToolName.c_str();
args[n++] = "-as-child";
args[n++] = "-child-output";
args[n++] = OutputFilename.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<const PassInfo*>::const_iterator I = Passes.begin(),
E = Passes.end(); I != E; ++I )
pass_args.push_back( std::string("-") + (*I)->getPassArgument() );
for (std::vector<std::string>::const_iterator I = pass_args.begin(),
E = pass_args.end(); I != E; ++I )
args[n++] = I->c_str();
args[n++] = inputFilename.c_str();
args[n++] = 0;
sys::Path prog;
if (UseValgrind)
prog = sys::Program::FindProgramByName("valgrind");
else
prog = tool;
int result = sys::Program::ExecuteAndWait(prog, args, 0, 0,
Timeout, MemoryLimit, &ErrMsg);
// If we are supposed to delete the bytecode 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)
cout << "Success!\n";
else if (result > 0)
cout << "Exited with error code '" << result << "'\n";
else if (result < 0) {
if (result == -1)
cout << "Execute failed: " << ErrMsg << "\n";
else
cout << "Crashed with signal #" << abs(result) << "\n";
}
if (result & 0x01000000)
cout << "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<const PassInfo*> &Passes,
bool AutoDebugCrashes) {
Module *OldProgram = swapProgramIn(M);
std::string BytecodeResult;
if (runPasses(Passes, BytecodeResult, false/*delete*/, true/*quiet*/)) {
if (AutoDebugCrashes) {
cerr << " Error running this sequence of passes"
<< " on the input program!\n";
delete OldProgram;
EmitProgressBytecode("pass-error", false);
exit(debugOptimizerCrash());
}
swapProgramIn(OldProgram);
return 0;
}
// Restore the current program.
swapProgramIn(OldProgram);
Module *Ret = ParseInputFile(BytecodeResult);
if (Ret == 0) {
cerr << getToolName() << ": Error reading bytecode file '"
<< BytecodeResult << "'!\n";
exit(1);
}
sys::Path(BytecodeResult).eraseFromDisk(); // No longer need the file on disk
return Ret;
}