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128 lines
3.9 KiB
C++
128 lines
3.9 KiB
C++
//===----------------------------------------------------------------------===//
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// LLVM Modular Optimizer Utility: opt
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//
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// Optimizations may be specified an arbitrary number of times on the command
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// line, they are run in the order specified.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Module.h"
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#include "llvm/PassManager.h"
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#include "llvm/Bytecode/Reader.h"
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#include "llvm/Bytecode/WriteBytecodePass.h"
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#include "llvm/Assembly/PrintModulePass.h"
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#include "llvm/Analysis/Verifier.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Support/PassNameParser.h"
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#include "Support/Signals.h"
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#include <fstream>
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#include <memory>
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#include <algorithm>
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using std::cerr;
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using std::string;
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// The OptimizationList is automatically populated with registered Passes by the
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// PassNameParser.
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//
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static cl::list<const PassInfo*, bool,
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FilteredPassNameParser<PassInfo::Optimization> >
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OptimizationList(cl::desc("Optimizations available:"));
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// Other command line options...
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//
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static cl::opt<string>
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InputFilename(cl::Positional, cl::desc("<input bytecode>"), cl::init("-"));
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static cl::opt<string>
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OutputFilename("o", cl::desc("Override output filename"),
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cl::value_desc("filename"));
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static cl::opt<bool>
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Force("f", cl::desc("Overwrite output files"));
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static cl::opt<bool>
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PrintEachXForm("p", cl::desc("Print module after each transformation"));
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static cl::opt<bool>
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Quiet("q", cl::desc("Don't print 'program modified' message"));
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static cl::alias
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QuietA("quiet", cl::desc("Alias for -q"), cl::aliasopt(Quiet));
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//===----------------------------------------------------------------------===//
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// main for opt
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//
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int main(int argc, char **argv) {
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cl::ParseCommandLineOptions(argc, argv,
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" llvm .bc -> .bc modular optimizer\n");
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// FIXME: This should be parameterizable eventually for different target
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// types...
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TargetData TD("opt target");
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// Load the input module...
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std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
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if (M.get() == 0) {
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cerr << argv[0] << ": bytecode didn't read correctly.\n";
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return 1;
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}
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// Figure out what stream we are supposed to write to...
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std::ostream *Out = &std::cout; // Default to printing to stdout...
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if (OutputFilename != "") {
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if (!Force && std::ifstream(OutputFilename.c_str())) {
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// If force is not specified, make sure not to overwrite a file!
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cerr << argv[0] << ": error opening '" << OutputFilename
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<< "': file exists!\n"
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<< "Use -f command line argument to force output\n";
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return 1;
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}
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Out = new std::ofstream(OutputFilename.c_str());
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if (!Out->good()) {
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cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
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return 1;
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}
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// Make sure that the Output file gets unlink'd from the disk if we get a
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// SIGINT
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RemoveFileOnSignal(OutputFilename);
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}
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// Create a PassManager to hold and optimize the collection of passes we are
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// about to build...
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//
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PassManager Passes;
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// Create a new optimization pass for each one specified on the command line
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for (unsigned i = 0; i < OptimizationList.size(); ++i) {
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const PassInfo *Opt = OptimizationList[i];
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if (Opt->getNormalCtor())
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Passes.add(Opt->getNormalCtor()());
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else if (Opt->getDataCtor())
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Passes.add(Opt->getDataCtor()(TD)); // Pass dummy target data...
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else
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cerr << argv[0] << ": cannot create pass: " << Opt->getPassName() << "\n";
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if (PrintEachXForm)
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Passes.add(new PrintModulePass(&cerr));
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}
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// Check that the module is well formed on completion of optimization
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Passes.add(createVerifierPass());
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// Write bytecode out to disk or cout as the last step...
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Passes.add(new WriteBytecodePass(Out, Out != &std::cout));
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// Now that we have all of the passes ready, run them.
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if (Passes.run(*M.get()) && !Quiet)
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cerr << "Program modified.\n";
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return 0;
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}
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