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llvm-mirror/tools/bugpoint/OptimizerDriver.cpp
Reid Spencer 04d734c2f6 Final Changes For PR495:
This chagne just renames some sys::Path methods to ensure they are not
misused. The Path documentation now divides methods into two dimensions:
Path/Disk and accessor/mutator. Path accessors and mutators only operate
on the Path object itself without making any disk accesses. Disk accessors
and mutators will also access or modify the file system. Because of the
potentially destructive nature of disk mutators, it was decided that all
such methods should end in the work "Disk" to ensure the user recognizes
that the change will occur on the file system. This patch makes that
change. The method name changes are:

makeReadable        -> makeReadableOnDisk
makeWriteable       -> makeWriteableOnDisk
makeExecutable      -> makeExecutableOnDisk
setStatusInfo       -> setStatusInfoOnDisk
createDirectory     -> createDirectoryOnDisk
createFile          -> createFileOnDisk
createTemporaryFile -> createTemporaryFileOnDisk
destroy             -> eraseFromDisk
rename              -> renamePathOnDisk

These changes pass the Linux Deja Gnu tests.

llvm-svn: 22354
2005-07-08 03:08:58 +00:00

220 lines
7.5 KiB
C++

//===- 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.
#ifdef _MSC_VER
#define PLATFORMINDEPENDENT
#endif
#include "BugDriver.h"
#include "llvm/Module.h"
#include "llvm/PassManager.h"
#include "llvm/Analysis/Verifier.h"
#include "llvm/Bytecode/WriteBytecodePass.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Support/FileUtilities.h"
#include "llvm/System/Path.h"
#include <fstream>
#ifndef PLATFORMINDEPENDENT
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#endif
using namespace llvm;
/// 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;
WriteBytecodeToFile(M ? M : Program, Out, /*compression=*/true);
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)) {
std::cerr << "Error opening file '" << Filename << "' for writing!\n";
return;
}
std::cout << "Emitted bytecode to '" << Filename << "'\n";
if (NoFlyer || PassesToRun.empty()) return;
std::cout << "\n*** You can reproduce the problem with: ";
unsigned PassType = PassesToRun[0]->getPassType();
for (unsigned i = 1, e = PassesToRun.size(); i != e; ++i)
PassType &= PassesToRun[i]->getPassType();
if (PassType & PassInfo::Analysis)
std::cout << "analyze";
else if (PassType & PassInfo::Optimization)
std::cout << "opt";
else if (PassType & PassInfo::LLC)
std::cout << "llc";
else
std::cout << "bugpoint";
std::cout << " " << Filename << " ";
std::cout << getPassesString(PassesToRun) << "\n";
}
static void RunChild(Module *Program,const std::vector<const PassInfo*> &Passes,
const std::string &OutFilename) {
std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
std::ios::binary;
std::ofstream OutFile(OutFilename.c_str(), io_mode);
if (!OutFile.good()) {
std::cerr << "Error opening bytecode file: " << OutFilename << "\n";
exit(1);
}
PassManager PM;
// Make sure that the appropriate target data is always used...
PM.add(new TargetData("bugpoint", Program));
for (unsigned i = 0, e = Passes.size(); i != e; ++i) {
if (Passes[i]->getNormalCtor())
PM.add(Passes[i]->getNormalCtor()());
else
std::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(new WriteBytecodePass(&OutFile));
// Run all queued passes.
PM.run(*Program);
}
/// 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{
std::cout << std::flush;
sys::Path uniqueFilename("bugpoint-output.bc");
uniqueFilename.makeUnique();
OutputFilename = uniqueFilename.toString();
#ifndef PLATFORMINDEPENDENT
pid_t child_pid;
switch (child_pid = fork()) {
case -1: // Error occurred
std::cerr << ToolName << ": Error forking!\n";
exit(1);
case 0: // Child process runs passes.
RunChild(Program, Passes, OutputFilename);
exit(0); // If we finish successfully, return 0!
default: // Parent continues...
break;
}
// Wait for the child process to get done.
int Status;
if (wait(&Status) != child_pid) {
std::cerr << "Error waiting for child process!\n";
exit(1);
}
bool ExitedOK = WIFEXITED(Status) && WEXITSTATUS(Status) == 0;
#else
bool ExitedOK = false;
#endif
// 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 || !ExitedOK)
sys::Path(OutputFilename).eraseFromDisk();
#ifndef PLATFORMINDEPENDENT
if (!Quiet) {
if (ExitedOK)
std::cout << "Success!\n";
else if (WIFEXITED(Status))
std::cout << "Exited with error code '" << WEXITSTATUS(Status) << "'\n";
else if (WIFSIGNALED(Status))
std::cout << "Crashed with signal #" << WTERMSIG(Status) << "\n";
#ifdef WCOREDUMP
else if (WCOREDUMP(Status))
std::cout << "Dumped core\n";
#endif
else
std::cout << "Failed for unknown reason!\n";
}
#endif
// Was the child successful?
return !ExitedOK;
}
/// 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) {
std::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) {
std::cerr << getToolName() << ": Error reading bytecode file '"
<< BytecodeResult << "'!\n";
exit(1);
}
sys::Path(BytecodeResult).eraseFromDisk(); // No longer need the file on disk
return Ret;
}