llvm-6502/tools/bugpoint/OptimizerDriver.cpp
Chris Lattner afade9294a Initial checkin of bugpoint
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4789 91177308-0d34-0410-b5e6-96231b3b80d8
2002-11-20 22:28:10 +00:00

151 lines
5.0 KiB
C++

//===- OptimizerDriver.cpp - Allow BugPoint to run passes safely ----------===//
//
// 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 it's own bugs, but that's another story...). It acheives 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. :)
//
//===----------------------------------------------------------------------===//
#include "BugDriver.h"
#include "llvm/PassManager.h"
#include "llvm/Analysis/Verifier.h"
#include "llvm/Bytecode/WriteBytecodePass.h"
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <stdlib.h>
#include <fstream>
/// removeFile - Delete the specified file
///
void BugDriver::removeFile(const std::string &Filename) const {
unlink(Filename.c_str());
}
/// 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) const {
std::ofstream Out(Filename.c_str());
if (!Out.good()) return true;
WriteBytecodeToFile(Program, Out);
return false;
}
/// EmitProgressBytecode - This function is used to output the current Program
/// to a file named "bugpoing-ID.bc".
///
void BugDriver::EmitProgressBytecode(const PassInfo *Pass,
const std::string &ID) {
// 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 'bugpoint-" << Filename << ".bc'\n";
std::cout << "\n*** You can reproduce the problem with: ";
unsigned PassType = Pass->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 << " -" << Pass->getPassArgument() << "\n";
}
static void RunChild(Module *Program,const std::vector<const PassInfo*> &Passes,
const std::string &OutFilename) {
std::ofstream OutFile(OutFilename.c_str());
if (!OutFile.good()) {
std::cerr << "Error opening bytecode file: " << OutFilename << "\n";
exit(1);
}
PassManager PM;
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 writting 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) const{
std::cout << std::flush;
// Agree on a temporary file name to use....
char FNBuffer[] = "bugpoint-output.bc-XXXXXX";
int TempFD;
if ((TempFD = mkstemp(FNBuffer)) == -1) {
std::cerr << ToolName << ": ERROR: Cannot create temporary"
<< " file in the current directory!\n";
exit(1);
}
OutputFilename = FNBuffer;
// We don't need to hold the temp file descriptor... we will trust that noone
// will overwrite/delete the file while we are working on it...
close(TempFD);
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);
}
// If we are supposed to delete the bytecode file, remove it now
// unconditionally... this may fail if the file was never created, but that's
// ok.
if (DeleteOutput)
removeFile(OutputFilename);
std::cout << (Status ? "Crashed!\n" : "Success!\n");
// Was the child successful?
return Status != 0;
}