1 //===----------------------------------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
9 // LLVM Modular Optimizer Utility: opt
11 // Optimizations may be specified an arbitrary number of times on the command
12 // line, they are run in the order specified.
14 //===----------------------------------------------------------------------===//
16 #include "llvm/Module.h"
17 #include "llvm/PassManager.h"
18 #include "llvm/Bytecode/Reader.h"
19 #include "llvm/Bytecode/WriteBytecodePass.h"
20 #include "llvm/Assembly/PrintModulePass.h"
21 #include "llvm/Analysis/Verifier.h"
22 #include "llvm/Target/TargetMachine.h"
23 #include "llvm/Target/TargetMachineImpls.h"
24 #include "llvm/Support/PassNameParser.h"
25 #include "Support/Signals.h"
32 // The OptimizationList is automatically populated with registered Passes by the
35 static cl::list<const PassInfo*, bool,
36 FilteredPassNameParser<PassInfo::Optimization> >
37 OptimizationList(cl::desc("Optimizations available:"));
40 // Other command line options...
42 static cl::opt<std::string>
43 InputFilename(cl::Positional, cl::desc("<input bytecode>"), cl::init("-"));
45 static cl::opt<std::string>
46 OutputFilename("o", cl::desc("Override output filename"),
47 cl::value_desc("filename"));
50 Force("f", cl::desc("Overwrite output files"));
53 PrintEachXForm("p", cl::desc("Print module after each transformation"));
56 NoOutput("disable-output",
57 cl::desc("Do not write result bytecode file"), cl::Hidden);
60 NoVerify("disable-verify", cl::desc("Do not verify result module"), cl::Hidden);
63 Quiet("q", cl::desc("Don't print 'program modified' message"));
66 QuietA("quiet", cl::desc("Alias for -q"), cl::aliasopt(Quiet));
69 //===----------------------------------------------------------------------===//
72 int main(int argc, char **argv) {
73 cl::ParseCommandLineOptions(argc, argv,
74 " llvm .bc -> .bc modular optimizer\n");
76 // Allocate a full target machine description only if necessary...
77 // FIXME: The choice of target should be controllable on the command line.
78 std::auto_ptr<TargetMachine> target;
80 TargetMachine* TM = NULL;
81 std::string ErrorMessage;
83 // Load the input module...
84 std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename, &ErrorMessage));
86 std::cerr << argv[0] << ": ";
87 if (ErrorMessage.size())
88 std::cerr << ErrorMessage << "\n";
90 std::cerr << "bytecode didn't read correctly.\n";
94 // Figure out what stream we are supposed to write to...
95 std::ostream *Out = &std::cout; // Default to printing to stdout...
96 if (OutputFilename != "") {
97 if (!Force && std::ifstream(OutputFilename.c_str())) {
98 // If force is not specified, make sure not to overwrite a file!
99 std::cerr << argv[0] << ": error opening '" << OutputFilename
100 << "': file exists!\n"
101 << "Use -f command line argument to force output\n";
104 Out = new std::ofstream(OutputFilename.c_str());
107 std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
111 // Make sure that the Output file gets unlinked from the disk if we get a
113 RemoveFileOnSignal(OutputFilename);
116 // Create a PassManager to hold and optimize the collection of passes we are
121 // Add an appropriate TargetData instance for this module...
122 Passes.add(new TargetData("opt", M.get()));
124 // Create a new optimization pass for each one specified on the command line
125 for (unsigned i = 0; i < OptimizationList.size(); ++i) {
126 const PassInfo *Opt = OptimizationList[i];
128 if (Opt->getNormalCtor())
129 Passes.add(Opt->getNormalCtor()());
130 else if (Opt->getTargetCtor()) {
132 if (target.get() == NULL)
133 target.reset(allocateSparcTargetMachine()); // FIXME: target option
135 assert(target.get() && "Could not allocate target machine!");
136 Passes.add(Opt->getTargetCtor()(*target.get()));
138 std::cerr << argv[0] << ": cannot create pass: " << Opt->getPassName()
142 Passes.add(new PrintModulePass(&std::cerr));
145 // Check that the module is well formed on completion of optimization
147 Passes.add(createVerifierPass());
149 // Write bytecode out to disk or cout as the last step...
151 Passes.add(new WriteBytecodePass(Out, Out != &std::cout));
153 // Now that we have all of the passes ready, run them.
154 if (Passes.run(*M.get()) && !Quiet)
155 std::cerr << "Program modified.\n";