1 //===----------------------------------------------------------------------===//
2 // LLVM Modular Optimizer Utility: opt
4 // Optimizations may be specified an arbitrary number of times on the command
5 // line, they are run in the order specified.
7 //===----------------------------------------------------------------------===//
9 #include "llvm/Module.h"
10 #include "llvm/PassManager.h"
11 #include "llvm/Bytecode/Reader.h"
12 #include "llvm/Bytecode/WriteBytecodePass.h"
13 #include "llvm/Assembly/PrintModulePass.h"
14 #include "llvm/Analysis/Verifier.h"
15 #include "llvm/Target/TargetMachine.h"
16 #include "llvm/Target/TargetMachineImpls.h"
17 #include "llvm/Support/PassNameParser.h"
18 #include "Support/Signals.h"
27 // The OptimizationList is automatically populated with registered Passes by the
30 static cl::list<const PassInfo*, bool,
31 FilteredPassNameParser<PassInfo::Optimization> >
32 OptimizationList(cl::desc("Optimizations available:"));
35 // Other command line options...
37 static cl::opt<string>
38 InputFilename(cl::Positional, cl::desc("<input bytecode>"), cl::init("-"));
40 static cl::opt<string>
41 OutputFilename("o", cl::desc("Override output filename"),
42 cl::value_desc("filename"));
45 Force("f", cl::desc("Overwrite output files"));
48 PrintEachXForm("p", cl::desc("Print module after each transformation"));
51 NoOutput("no-output", cl::desc("Do not write result bytecode file"), cl::Hidden);
54 Quiet("q", cl::desc("Don't print 'program modified' message"));
57 QuietA("quiet", cl::desc("Alias for -q"), cl::aliasopt(Quiet));
60 //===----------------------------------------------------------------------===//
63 int main(int argc, char **argv) {
64 cl::ParseCommandLineOptions(argc, argv,
65 " llvm .bc -> .bc modular optimizer\n");
67 // FIXME: The choice of target should be controllable on the command line.
68 TargetData TD("opt target");
70 // Allocate a full target machine description only if necessary...
71 // FIXME: The choice of target should be controllable on the command line.
72 std::auto_ptr<TargetMachine> target;
74 TargetMachine* TM = NULL;
76 // Load the input module...
77 std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
79 cerr << argv[0] << ": bytecode didn't read correctly.\n";
83 // Figure out what stream we are supposed to write to...
84 std::ostream *Out = &std::cout; // Default to printing to stdout...
85 if (OutputFilename != "") {
86 if (!Force && std::ifstream(OutputFilename.c_str())) {
87 // If force is not specified, make sure not to overwrite a file!
88 cerr << argv[0] << ": error opening '" << OutputFilename
89 << "': file exists!\n"
90 << "Use -f command line argument to force output\n";
93 Out = new std::ofstream(OutputFilename.c_str());
96 cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
100 // Make sure that the Output file gets unlink'd from the disk if we get a
102 RemoveFileOnSignal(OutputFilename);
105 // Create a PassManager to hold and optimize the collection of passes we are
110 // Create a new optimization pass for each one specified on the command line
111 for (unsigned i = 0; i < OptimizationList.size(); ++i) {
112 const PassInfo *Opt = OptimizationList[i];
114 if (Opt->getNormalCtor())
115 Passes.add(Opt->getNormalCtor()());
116 else if (Opt->getDataCtor())
117 Passes.add(Opt->getDataCtor()(TD)); // Provide dummy target data...
118 else if (Opt->getTargetCtor()) {
119 if (target.get() == NULL)
120 target.reset(allocateSparcTargetMachine()); // FIXME: target option
121 assert(target.get() && "Could not allocate target machine!");
122 Passes.add(Opt->getTargetCtor()(*target.get()));
124 cerr << argv[0] << ": cannot create pass: " << Opt->getPassName() << "\n";
127 Passes.add(new PrintModulePass(&cerr));
130 // Check that the module is well formed on completion of optimization
131 Passes.add(createVerifierPass());
133 // Write bytecode out to disk or cout as the last step...
135 Passes.add(new WriteBytecodePass(Out, Out != &std::cout));
137 // Now that we have all of the passes ready, run them.
138 if (Passes.run(*M.get()) && !Quiet)
139 cerr << "Program modified.\n";