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/TargetData.h"
22 #include "llvm/Target/TargetMachine.h"
23 #include "llvm/Support/PassNameParser.h"
24 #include "llvm/System/Signals.h"
25 #include "llvm/Support/PluginLoader.h"
26 #include "llvm/Support/SystemUtils.h"
27 #include "llvm/Support/Timer.h"
28 #include "llvm/LinkAllPasses.h"
29 #include "llvm/LinkAllVMCore.h"
35 // The OptimizationList is automatically populated with registered Passes by the
38 static cl::list<const PassInfo*, bool, PassNameParser>
39 PassList(cl::desc("Optimizations available:"));
41 static cl::opt<bool> NoCompress("disable-compression", cl::init(false),
42 cl::desc("Don't compress the generated bytecode"));
44 // Other command line options...
46 static cl::opt<std::string>
47 InputFilename(cl::Positional, cl::desc("<input bytecode file>"),
48 cl::init("-"), cl::value_desc("filename"));
50 static cl::opt<std::string>
51 OutputFilename("o", cl::desc("Override output filename"),
52 cl::value_desc("filename"), cl::init("-"));
55 Force("f", cl::desc("Overwrite output files"));
58 PrintEachXForm("p", cl::desc("Print module after each transformation"));
61 NoOutput("disable-output",
62 cl::desc("Do not write result bytecode file"), cl::Hidden);
65 NoVerify("disable-verify", cl::desc("Do not verify result module"), cl::Hidden);
68 Quiet("q", cl::desc("Obsolete option"), cl::Hidden);
71 QuietA("quiet", cl::desc("Alias for -q"), cl::aliasopt(Quiet));
74 AnalyzeOnly("analyze", cl::desc("Only perform analysis, no optimization"));
76 static Timer BytecodeLoadTimer("Bytecode Loader");
78 // ---------- Define Printers for module and function passes ------------
81 struct ModulePassPrinter : public ModulePass {
82 const PassInfo *PassToPrint;
83 ModulePassPrinter(const PassInfo *PI) : PassToPrint(PI) {}
85 virtual bool runOnModule(Module &M) {
87 std::cout << "Printing analysis '" << PassToPrint->getPassName()
89 getAnalysisID<Pass>(PassToPrint).print(std::cout, &M);
92 // Get and print pass...
96 virtual const char *getPassName() const { return "'Pass' Printer"; }
98 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
99 AU.addRequiredID(PassToPrint);
100 AU.setPreservesAll();
104 struct FunctionPassPrinter : public FunctionPass {
105 const PassInfo *PassToPrint;
106 FunctionPassPrinter(const PassInfo *PI) : PassToPrint(PI) {}
108 virtual bool runOnFunction(Function &F) {
110 std::cout << "Printing analysis '" << PassToPrint->getPassName()
111 << "' for function '" << F.getName() << "':\n";
113 // Get and print pass...
114 getAnalysisID<Pass>(PassToPrint).print(std::cout, F.getParent());
118 virtual const char *getPassName() const { return "FunctionPass Printer"; }
120 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
121 AU.addRequiredID(PassToPrint);
122 AU.setPreservesAll();
126 struct BasicBlockPassPrinter : public BasicBlockPass {
127 const PassInfo *PassToPrint;
128 BasicBlockPassPrinter(const PassInfo *PI) : PassToPrint(PI) {}
130 virtual bool runOnBasicBlock(BasicBlock &BB) {
132 std::cout << "Printing Analysis info for BasicBlock '" << BB.getName()
133 << "': Pass " << PassToPrint->getPassName() << ":\n";
136 // Get and print pass...
137 getAnalysisID<Pass>(PassToPrint).print(
138 std::cout, BB.getParent()->getParent());
142 virtual const char *getPassName() const { return "BasicBlockPass Printer"; }
144 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
145 AU.addRequiredID(PassToPrint);
146 AU.setPreservesAll();
150 } // anonymous namespace
153 //===----------------------------------------------------------------------===//
156 int main(int argc, char **argv) {
158 cl::ParseCommandLineOptions(argc, argv,
159 " llvm .bc -> .bc modular optimizer and analysis printer \n");
160 sys::PrintStackTraceOnErrorSignal();
162 // Allocate a full target machine description only if necessary.
163 // FIXME: The choice of target should be controllable on the command line.
164 std::auto_ptr<TargetMachine> target;
166 std::string ErrorMessage;
168 // Load the input module...
169 std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename, &ErrorMessage));
171 std::cerr << argv[0] << ": ";
172 if (ErrorMessage.size())
173 std::cerr << ErrorMessage << "\n";
175 std::cerr << "bytecode didn't read correctly.\n";
179 // Figure out what stream we are supposed to write to...
180 // FIXME: cout is not binary!
181 std::ostream *Out = &std::cout; // Default to printing to stdout...
182 if (OutputFilename != "-") {
183 if (!Force && std::ifstream(OutputFilename.c_str())) {
184 // If force is not specified, make sure not to overwrite a file!
185 std::cerr << argv[0] << ": error opening '" << OutputFilename
186 << "': file exists!\n"
187 << "Use -f command line argument to force output\n";
190 std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
192 Out = new std::ofstream(OutputFilename.c_str(), io_mode);
195 std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
199 // Make sure that the Output file gets unlinked from the disk if we get a
201 sys::RemoveFileOnSignal(sys::Path(OutputFilename));
204 // If the output is set to be emitted to standard out, and standard out is a
205 // console, print out a warning message and refuse to do it. We don't
206 // impress anyone by spewing tons of binary goo to a terminal.
207 if (!Force && !NoOutput && CheckBytecodeOutputToConsole(Out,!Quiet)) {
211 // Create a PassManager to hold and optimize the collection of passes we are
216 // Add an appropriate TargetData instance for this module...
217 Passes.add(new TargetData(M.get()));
219 // Create a new optimization pass for each one specified on the command line
220 for (unsigned i = 0; i < PassList.size(); ++i) {
221 const PassInfo *PassInf = PassList[i];
223 if (PassInf->getNormalCtor())
224 P = PassInf->getNormalCtor()();
225 else if (PassInf->getTargetCtor()) {
226 assert(target.get() && "Could not allocate target machine!");
227 P = PassInf->getTargetCtor()(*target.get());
229 std::cerr << argv[0] << ": cannot create pass: "
230 << PassInf->getPassName() << "\n";
235 if (dynamic_cast<BasicBlockPass*>(P))
236 Passes.add(new BasicBlockPassPrinter(PassInf));
237 else if (dynamic_cast<FunctionPass*>(P))
238 Passes.add(new FunctionPassPrinter(PassInf));
240 Passes.add(new ModulePassPrinter(PassInf));
245 Passes.add(new PrintModulePass(&std::cerr));
248 // Check that the module is well formed on completion of optimization
250 Passes.add(createVerifierPass());
252 // Write bytecode out to disk or cout as the last step...
253 if (!NoOutput && !AnalyzeOnly)
254 Passes.add(new WriteBytecodePass(Out, Out != &std::cout, !NoCompress));
256 // Now that we have all of the passes ready, run them.
257 Passes.run(*M.get());
261 } catch (const std::string& msg) {
262 std::cerr << argv[0] << ": " << msg << "\n";
264 std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";