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//===----------------------------------------------------------------------===//
// LLVM 'OPT' UTILITY
//
// 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/TargetData.h"
#include "llvm/Support/PassNameParser.h"
#include "Support/Signals.h"
#include <fstream>
#include <memory>
#include <algorithm>
using std::cerr;
using std::string;
// 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<string>
InputFilename(cl::Positional, cl::desc("<input bytecode>"), cl::init("-"));
static cl::opt<string>
OutputFilename("o", cl::desc("Override output filename"),
cl::value_desc("filename"));
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>
Quiet("q", cl::desc("Don't print modifying pass names"));
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");
// FIXME: This should be parameterizable eventually for different target
// types...
TargetData TD("opt target");
// Load the input module...
std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
if (M.get() == 0) {
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!
cerr << "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()) {
cerr << "Error opening " << OutputFilename << "!\n";
return 1;
}
// Make sure that the Output file gets unlink'd from the disk if we get a
// SIGINT
RemoveFileOnSignal(OutputFilename);
}
// Create a PassManager to hold and optimize the collection of passes we are
// about to build...
//
PassManager Passes;
// 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->getDataCtor())
Passes.add(Opt->getDataCtor()(TD)); // Pass dummy target data...
else
cerr << "Cannot create pass: " << Opt->getPassName() << "\n";
if (PrintEachXForm)
Passes.add(new PrintModulePass(&cerr));
}
// Check that the module is well formed on completion of optimization
Passes.add(createVerifierPass());
// Write bytecode out to disk or cout as the last step...
Passes.add(new WriteBytecodePass(Out, Out != &std::cout));
// Now that we have all of the passes ready, run them.
if (Passes.run(*M.get()) && !Quiet)
cerr << "Program modified.\n";
return 0;
}
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