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//===- opt.cpp - The LLVM Modular Optimizer -------------------------------===//
//
// 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.
//
//===----------------------------------------------------------------------===//
//
// Optimizations may be specified an arbitrary number of times on the command
// line, they are run in the order specified.
//
//===----------------------------------------------------------------------===//
#include "llvm/Module.h"
#include "llvm/PassManager.h"
#include "llvm/Bytecode/Reader.h"
#include "llvm/Bytecode/WriteBytecodePass.h"
#include "llvm/Assembly/PrintModulePass.h"
#include "llvm/Analysis/Verifier.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/PassNameParser.h"
#include "llvm/System/Signals.h"
#include "Support/PluginLoader.h"
#include "Support/SystemUtils.h"
#include <fstream>
#include <memory>
#include <algorithm>
using namespace llvm;
// The OptimizationList is automatically populated with registered Passes by the
// PassNameParser.
//
static cl::list<const PassInfo*, bool,
FilteredPassNameParser<PassInfo::Optimization> >
OptimizationList(cl::desc("Optimizations available:"));
// Other command line options...
//
static cl::opt<std::string>
InputFilename(cl::Positional, cl::desc("<input bytecode>"), cl::init("-"));
static cl::opt<std::string>
OutputFilename("o", cl::desc("Override output filename"),
cl::value_desc("filename"), cl::init("-"));
static cl::opt<bool>
Force("f", cl::desc("Overwrite output files"));
static cl::opt<bool>
PrintEachXForm("p", cl::desc("Print module after each transformation"));
static cl::opt<bool>
NoOutput("disable-output",
cl::desc("Do not write result bytecode file"), cl::Hidden);
static cl::opt<bool>
NoVerify("disable-verify", cl::desc("Do not verify result module"), cl::Hidden);
static cl::opt<bool>
Quiet("q", cl::desc("Obsolete option"), cl::Hidden);
static cl::alias
QuietA("quiet", cl::desc("Alias for -q"), cl::aliasopt(Quiet));
//===----------------------------------------------------------------------===//
// main for opt
//
int main(int argc, char **argv) {
cl::ParseCommandLineOptions(argc, argv,
" llvm .bc -> .bc modular optimizer\n");
sys::PrintStackTraceOnErrorSignal();
// Allocate a full target machine description only if necessary...
// FIXME: The choice of target should be controllable on the command line.
std::auto_ptr<TargetMachine> target;
TargetMachine* TM = NULL;
std::string ErrorMessage;
// Load the input module...
std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename, &ErrorMessage));
if (M.get() == 0) {
std::cerr << argv[0] << ": ";
if (ErrorMessage.size())
std::cerr << ErrorMessage << "\n";
else
std::cerr << "bytecode didn't read correctly.\n";
return 1;
}
// Figure out what stream we are supposed to write to...
std::ostream *Out = &std::cout; // Default to printing to stdout...
if (OutputFilename != "-") {
if (!Force && std::ifstream(OutputFilename.c_str())) {
// If force is not specified, make sure not to overwrite a file!
std::cerr << argv[0] << ": error opening '" << OutputFilename
<< "': file exists!\n"
<< "Use -f command line argument to force output\n";
return 1;
}
Out = new std::ofstream(OutputFilename.c_str());
if (!Out->good()) {
std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
return 1;
}
// Make sure that the Output file gets unlinked from the disk if we get a
// SIGINT
sys::RemoveFileOnSignal(OutputFilename);
}
// If the output is set to be emitted to standard out, and standard out is a
// console, print out a warning message and refuse to do it. We don't impress
// anyone by spewing tons of binary goo to a terminal.
if (Out == &std::cout && isStandardOutAConsole() && !Force && !NoOutput
&& !Quiet) {
std::cerr << "WARNING: It looks like you're attempting to print out a "
<< "bytecode file. I'm\ngoing to pretend you didn't ask me to do"
<< " this (for your own good). If you\nREALLY want to taste LLVM"
<< " bytecode first hand, you can force output with the\n'-f'"
<< " option.\n\n";
NoOutput = true;
}
// Create a PassManager to hold and optimize the collection of passes we are
// about to build...
//
PassManager Passes;
// Add an appropriate TargetData instance for this module...
Passes.add(new TargetData("opt", M.get()));
// Create a new optimization pass for each one specified on the command line
for (unsigned i = 0; i < OptimizationList.size(); ++i) {
const PassInfo *Opt = OptimizationList[i];
if (Opt->getNormalCtor())
Passes.add(Opt->getNormalCtor()());
else if (Opt->getTargetCtor()) {
#if 0
if (target.get() == NULL)
target.reset(allocateSparcTargetMachine()); // FIXME: target option
#endif
assert(target.get() && "Could not allocate target machine!");
Passes.add(Opt->getTargetCtor()(*target.get()));
} else
std::cerr << argv[0] << ": cannot create pass: " << Opt->getPassName()
<< "\n";
if (PrintEachXForm)
Passes.add(new PrintModulePass(&std::cerr));
}
// Check that the module is well formed on completion of optimization
if (!NoVerify)
Passes.add(createVerifierPass());
// Write bytecode out to disk or cout as the last step...
if (!NoOutput)
Passes.add(new WriteBytecodePass(Out, Out != &std::cout));
// Now that we have all of the passes ready, run them.
Passes.run(*M.get());
return 0;
}
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