1 //===- opt.cpp - The LLVM Modular Optimizer -------------------------------===//
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 //===----------------------------------------------------------------------===//
10 // Optimizations may be specified an arbitrary number of times on the command
11 // line, they are run in the order specified.
13 //===----------------------------------------------------------------------===//
15 #include "llvm/Module.h"
16 #include "llvm/PassManager.h"
17 #include "llvm/Bytecode/Reader.h"
18 #include "llvm/Bytecode/WriteBytecodePass.h"
19 #include "llvm/Assembly/PrintModulePass.h"
20 #include "llvm/Analysis/Verifier.h"
21 #include "llvm/Target/TargetMachine.h"
22 #include "llvm/Support/PassNameParser.h"
23 #include "llvm/System/Signals.h"
24 #include "llvm/Support/PluginLoader.h"
25 #include "llvm/Support/SystemUtils.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"), cl::init("-"));
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("Obsolete option"), cl::Hidden);
66 QuietA("quiet", cl::desc("Alias for -q"), cl::aliasopt(Quiet));
69 //===----------------------------------------------------------------------===//
72 int main(int argc, char **argv) {
74 cl::ParseCommandLineOptions(argc, argv,
75 " llvm .bc -> .bc modular optimizer\n");
76 sys::PrintStackTraceOnErrorSignal();
78 // Allocate a full target machine description only if necessary...
79 // FIXME: The choice of target should be controllable on the command line.
80 std::auto_ptr<TargetMachine> target;
82 TargetMachine* TM = NULL;
83 std::string ErrorMessage;
85 // Load the input module...
86 std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename, &ErrorMessage));
88 std::cerr << argv[0] << ": ";
89 if (ErrorMessage.size())
90 std::cerr << ErrorMessage << "\n";
92 std::cerr << "bytecode didn't read correctly.\n";
96 // Figure out what stream we are supposed to write to...
97 std::ostream *Out = &std::cout; // Default to printing to stdout...
98 if (OutputFilename != "-") {
99 if (!Force && std::ifstream(OutputFilename.c_str())) {
100 // If force is not specified, make sure not to overwrite a file!
101 std::cerr << argv[0] << ": error opening '" << OutputFilename
102 << "': file exists!\n"
103 << "Use -f command line argument to force output\n";
106 Out = new std::ofstream(OutputFilename.c_str());
109 std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
113 // Make sure that the Output file gets unlinked from the disk if we get a
115 sys::RemoveFileOnSignal(sys::Path(OutputFilename));
118 // If the output is set to be emitted to standard out, and standard out is a
119 // console, print out a warning message and refuse to do it. We don't impress
120 // anyone by spewing tons of binary goo to a terminal.
121 if (!Force && !NoOutput && !Quiet && CheckBytecodeOutputToConsole(Out)) {
125 // Create a PassManager to hold and optimize the collection of passes we are
130 // Add an appropriate TargetData instance for this module...
131 Passes.add(new TargetData("opt", M.get()));
133 // Create a new optimization pass for each one specified on the command line
134 for (unsigned i = 0; i < OptimizationList.size(); ++i) {
135 const PassInfo *Opt = OptimizationList[i];
137 if (Opt->getNormalCtor())
138 Passes.add(Opt->getNormalCtor()());
139 else if (Opt->getTargetCtor()) {
141 if (target.get() == NULL)
142 target.reset(allocateSparcTargetMachine()); // FIXME: target option
144 assert(target.get() && "Could not allocate target machine!");
145 Passes.add(Opt->getTargetCtor()(*target.get()));
147 std::cerr << argv[0] << ": cannot create pass: " << Opt->getPassName()
151 Passes.add(new PrintModulePass(&std::cerr));
154 // Check that the module is well formed on completion of optimization
156 Passes.add(createVerifierPass());
158 // Write bytecode out to disk or cout as the last step...
160 Passes.add(new WriteBytecodePass(Out, Out != &std::cout));
162 // Now that we have all of the passes ready, run them.
163 Passes.run(*M.get());
166 } catch (const std::string& msg) {
167 std::cerr << argv[0] << ": " << msg << "\n";
169 std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";