1 //===- opt.cpp - The LLVM Modular Optimizer -------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // 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/LLVMContext.h"
16 #include "llvm/Module.h"
17 #include "llvm/ModuleProvider.h"
18 #include "llvm/PassManager.h"
19 #include "llvm/CallGraphSCCPass.h"
20 #include "llvm/Bitcode/ReaderWriter.h"
21 #include "llvm/Assembly/PrintModulePass.h"
22 #include "llvm/Analysis/Verifier.h"
23 #include "llvm/Analysis/LoopPass.h"
24 #include "llvm/Analysis/CallGraph.h"
25 #include "llvm/Target/TargetData.h"
26 #include "llvm/Target/TargetMachine.h"
27 #include "llvm/Support/PassNameParser.h"
28 #include "llvm/System/Signals.h"
29 #include "llvm/Support/ManagedStatic.h"
30 #include "llvm/Support/MemoryBuffer.h"
31 #include "llvm/Support/PluginLoader.h"
32 #include "llvm/Support/StandardPasses.h"
33 #include "llvm/Support/SystemUtils.h"
34 #include "llvm/Support/raw_ostream.h"
35 #include "llvm/LinkAllPasses.h"
36 #include "llvm/LinkAllVMCore.h"
41 // The OptimizationList is automatically populated with registered Passes by the
44 static cl::list<const PassInfo*, bool, PassNameParser>
45 PassList(cl::desc("Optimizations available:"));
47 // Other command line options...
49 static cl::opt<std::string>
50 InputFilename(cl::Positional, cl::desc("<input bitcode file>"),
51 cl::init("-"), cl::value_desc("filename"));
53 static cl::opt<std::string>
54 OutputFilename("o", cl::desc("Override output filename"),
55 cl::value_desc("filename"), cl::init("-"));
58 Force("f", cl::desc("Overwrite output files"));
61 PrintEachXForm("p", cl::desc("Print module after each transformation"));
64 NoOutput("disable-output",
65 cl::desc("Do not write result bitcode file"), cl::Hidden);
68 NoVerify("disable-verify", cl::desc("Do not verify result module"), cl::Hidden);
71 VerifyEach("verify-each", cl::desc("Verify after each transform"));
74 StripDebug("strip-debug",
75 cl::desc("Strip debugger symbol info from translation unit"));
78 DisableInline("disable-inlining", cl::desc("Do not run the inliner pass"));
81 DisableOptimizations("disable-opt",
82 cl::desc("Do not run any optimization passes"));
85 DisableInternalize("disable-internalize",
86 cl::desc("Do not mark all symbols as internal"));
89 StandardCompileOpts("std-compile-opts",
90 cl::desc("Include the standard compile time optimizations"));
93 StandardLinkOpts("std-link-opts",
94 cl::desc("Include the standard link time optimizations"));
98 cl::desc("Optimization level 1. Similar to llvm-gcc -O1"));
102 cl::desc("Optimization level 2. Similar to llvm-gcc -O2"));
106 cl::desc("Optimization level 3. Similar to llvm-gcc -O3"));
109 UnitAtATime("funit-at-a-time",
110 cl::desc("Enable IPO. This is same as llvm-gcc's -funit-at-a-time"));
113 DisableSimplifyLibCalls("disable-simplify-libcalls",
114 cl::desc("Disable simplify-libcalls"));
117 Quiet("q", cl::desc("Obsolete option"), cl::Hidden);
120 QuietA("quiet", cl::desc("Alias for -q"), cl::aliasopt(Quiet));
123 AnalyzeOnly("analyze", cl::desc("Only perform analysis, no optimization"));
125 // ---------- Define Printers for module and function passes ------------
128 struct CallGraphSCCPassPrinter : public CallGraphSCCPass {
130 const PassInfo *PassToPrint;
131 CallGraphSCCPassPrinter(const PassInfo *PI) :
132 CallGraphSCCPass(&ID), PassToPrint(PI) {}
134 virtual bool runOnSCC(const std::vector<CallGraphNode *>&SCC) {
136 outs() << "Printing analysis '" << PassToPrint->getPassName() << "':\n";
138 for (unsigned i = 0, e = SCC.size(); i != e; ++i) {
139 Function *F = SCC[i]->getFunction();
142 getAnalysisID<Pass>(PassToPrint).print(cout, F->getParent());
147 // Get and print pass...
151 virtual const char *getPassName() const { return "'Pass' Printer"; }
153 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
154 AU.addRequiredID(PassToPrint);
155 AU.setPreservesAll();
159 char CallGraphSCCPassPrinter::ID = 0;
161 struct ModulePassPrinter : public ModulePass {
163 const PassInfo *PassToPrint;
164 ModulePassPrinter(const PassInfo *PI) : ModulePass(&ID),
167 virtual bool runOnModule(Module &M) {
169 outs() << "Printing analysis '" << PassToPrint->getPassName() << "':\n";
171 getAnalysisID<Pass>(PassToPrint).print(cout, &M);
175 // Get and print pass...
179 virtual const char *getPassName() const { return "'Pass' Printer"; }
181 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
182 AU.addRequiredID(PassToPrint);
183 AU.setPreservesAll();
187 char ModulePassPrinter::ID = 0;
188 struct FunctionPassPrinter : public FunctionPass {
189 const PassInfo *PassToPrint;
191 FunctionPassPrinter(const PassInfo *PI) : FunctionPass(&ID),
194 virtual bool runOnFunction(Function &F) {
196 outs() << "Printing analysis '" << PassToPrint->getPassName()
197 << "' for function '" << F.getName() << "':\n";
199 // Get and print pass...
201 getAnalysisID<Pass>(PassToPrint).print(cout, F.getParent());
206 virtual const char *getPassName() const { return "FunctionPass Printer"; }
208 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
209 AU.addRequiredID(PassToPrint);
210 AU.setPreservesAll();
214 char FunctionPassPrinter::ID = 0;
216 struct LoopPassPrinter : public LoopPass {
218 const PassInfo *PassToPrint;
219 LoopPassPrinter(const PassInfo *PI) :
220 LoopPass(&ID), PassToPrint(PI) {}
222 virtual bool runOnLoop(Loop *L, LPPassManager &LPM) {
224 outs() << "Printing analysis '" << PassToPrint->getPassName() << "':\n";
226 getAnalysisID<Pass>(PassToPrint).print(cout,
227 L->getHeader()->getParent()->getParent());
230 // Get and print pass...
234 virtual const char *getPassName() const { return "'Pass' Printer"; }
236 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
237 AU.addRequiredID(PassToPrint);
238 AU.setPreservesAll();
242 char LoopPassPrinter::ID = 0;
244 struct BasicBlockPassPrinter : public BasicBlockPass {
245 const PassInfo *PassToPrint;
247 BasicBlockPassPrinter(const PassInfo *PI)
248 : BasicBlockPass(&ID), PassToPrint(PI) {}
250 virtual bool runOnBasicBlock(BasicBlock &BB) {
252 outs() << "Printing Analysis info for BasicBlock '" << BB.getName()
253 << "': Pass " << PassToPrint->getPassName() << ":\n";
256 // Get and print pass...
258 getAnalysisID<Pass>(PassToPrint).print(cout, BB.getParent()->getParent());
263 virtual const char *getPassName() const { return "BasicBlockPass Printer"; }
265 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
266 AU.addRequiredID(PassToPrint);
267 AU.setPreservesAll();
271 char BasicBlockPassPrinter::ID = 0;
272 inline void addPass(PassManager &PM, Pass *P) {
273 // Add the pass to the pass manager...
276 // If we are verifying all of the intermediate steps, add the verifier...
277 if (VerifyEach) PM.add(createVerifierPass());
280 /// AddOptimizationPasses - This routine adds optimization passes
281 /// based on selected optimization level, OptLevel. This routine
282 /// duplicates llvm-gcc behaviour.
284 /// OptLevel - Optimization Level
285 void AddOptimizationPasses(PassManager &MPM, FunctionPassManager &FPM,
287 createStandardFunctionPasses(&FPM, OptLevel);
289 llvm::Pass *InliningPass = OptLevel > 1 ? createFunctionInliningPass() : 0;
290 createStandardModulePasses(&MPM, OptLevel,
291 /*OptimizeSize=*/ false,
293 /*UnrollLoops=*/ OptLevel > 1,
294 !DisableSimplifyLibCalls,
295 /*HaveExceptions=*/ true,
299 void AddStandardCompilePasses(PassManager &PM) {
300 PM.add(createVerifierPass()); // Verify that input is correct
302 addPass(PM, createLowerSetJmpPass()); // Lower llvm.setjmp/.longjmp
304 // If the -strip-debug command line option was specified, do it.
306 addPass(PM, createStripSymbolsPass(true));
308 if (DisableOptimizations) return;
310 llvm::Pass *InliningPass = !DisableInline ? createFunctionInliningPass() : 0;
312 // -std-compile-opts adds the same module passes as -O3.
313 createStandardModulePasses(&PM, 3,
314 /*OptimizeSize=*/ false,
315 /*UnitAtATime=*/ true,
316 /*UnrollLoops=*/ true,
317 /*SimplifyLibCalls=*/ true,
318 /*HaveExceptions=*/ true,
322 void AddStandardLinkPasses(PassManager &PM) {
323 PM.add(createVerifierPass()); // Verify that input is correct
325 // If the -strip-debug command line option was specified, do it.
327 addPass(PM, createStripSymbolsPass(true));
329 if (DisableOptimizations) return;
331 createStandardLTOPasses(&PM, /*Internalize=*/ !DisableInternalize,
332 /*RunInliner=*/ !DisableInline,
333 /*VerifyEach=*/ VerifyEach);
336 } // anonymous namespace
339 //===----------------------------------------------------------------------===//
342 int main(int argc, char **argv) {
343 llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
344 LLVMContext &Context = getGlobalContext();
346 cl::ParseCommandLineOptions(argc, argv,
347 "llvm .bc -> .bc modular optimizer and analysis printer\n");
348 sys::PrintStackTraceOnErrorSignal();
350 // Allocate a full target machine description only if necessary.
351 // FIXME: The choice of target should be controllable on the command line.
352 std::auto_ptr<TargetMachine> target;
354 std::string ErrorMessage;
356 // Load the input module...
357 std::auto_ptr<Module> M;
358 if (MemoryBuffer *Buffer
359 = MemoryBuffer::getFileOrSTDIN(InputFilename, &ErrorMessage)) {
360 M.reset(ParseBitcodeFile(Buffer, Context, &ErrorMessage));
365 errs() << argv[0] << ": ";
366 if (ErrorMessage.size())
367 errs() << ErrorMessage << "\n";
369 errs() << "bitcode didn't read correctly.\n";
373 // Figure out what stream we are supposed to write to...
374 // FIXME: outs() is not binary!
375 raw_ostream *Out = &outs(); // Default to printing to stdout...
376 if (OutputFilename != "-") {
377 std::string ErrorInfo;
378 Out = new raw_fd_ostream(OutputFilename.c_str(), /*Binary=*/true,
380 if (!ErrorInfo.empty()) {
381 errs() << ErrorInfo << '\n';
383 errs() << "Use -f command line argument to force output\n";
388 // Make sure that the Output file gets unlinked from the disk if we get a
390 sys::RemoveFileOnSignal(sys::Path(OutputFilename));
393 // If the output is set to be emitted to standard out, and standard out is a
394 // console, print out a warning message and refuse to do it. We don't
395 // impress anyone by spewing tons of binary goo to a terminal.
396 if (!Force && !NoOutput && CheckBitcodeOutputToConsole(Out,!Quiet)) {
400 // Create a PassManager to hold and optimize the collection of passes we are
405 // Add an appropriate TargetData instance for this module...
406 Passes.add(new TargetData(M.get()));
408 FunctionPassManager *FPasses = NULL;
409 if (OptLevelO1 || OptLevelO2 || OptLevelO3) {
410 FPasses = new FunctionPassManager(new ExistingModuleProvider(M.get()));
411 FPasses->add(new TargetData(M.get()));
414 // If the -strip-debug command line option was specified, add it. If
415 // -std-compile-opts was also specified, it will handle StripDebug.
416 if (StripDebug && !StandardCompileOpts)
417 addPass(Passes, createStripSymbolsPass(true));
419 // Create a new optimization pass for each one specified on the command line
420 for (unsigned i = 0; i < PassList.size(); ++i) {
421 // Check to see if -std-compile-opts was specified before this option. If
423 if (StandardCompileOpts &&
424 StandardCompileOpts.getPosition() < PassList.getPosition(i)) {
425 AddStandardCompilePasses(Passes);
426 StandardCompileOpts = false;
429 if (StandardLinkOpts &&
430 StandardLinkOpts.getPosition() < PassList.getPosition(i)) {
431 AddStandardLinkPasses(Passes);
432 StandardLinkOpts = false;
435 if (OptLevelO1 && OptLevelO1.getPosition() < PassList.getPosition(i)) {
436 AddOptimizationPasses(Passes, *FPasses, 1);
440 if (OptLevelO2 && OptLevelO2.getPosition() < PassList.getPosition(i)) {
441 AddOptimizationPasses(Passes, *FPasses, 2);
445 if (OptLevelO3 && OptLevelO3.getPosition() < PassList.getPosition(i)) {
446 AddOptimizationPasses(Passes, *FPasses, 3);
450 const PassInfo *PassInf = PassList[i];
452 if (PassInf->getNormalCtor())
453 P = PassInf->getNormalCtor()();
455 errs() << argv[0] << ": cannot create pass: "
456 << PassInf->getPassName() << "\n";
458 bool isBBPass = dynamic_cast<BasicBlockPass*>(P) != 0;
459 bool isLPass = !isBBPass && dynamic_cast<LoopPass*>(P) != 0;
460 bool isFPass = !isLPass && dynamic_cast<FunctionPass*>(P) != 0;
461 bool isCGSCCPass = !isFPass && dynamic_cast<CallGraphSCCPass*>(P) != 0;
467 Passes.add(new BasicBlockPassPrinter(PassInf));
469 Passes.add(new LoopPassPrinter(PassInf));
471 Passes.add(new FunctionPassPrinter(PassInf));
472 else if (isCGSCCPass)
473 Passes.add(new CallGraphSCCPassPrinter(PassInf));
475 Passes.add(new ModulePassPrinter(PassInf));
480 Passes.add(createPrintModulePass(&errs()));
483 // If -std-compile-opts was specified at the end of the pass list, add them.
484 if (StandardCompileOpts) {
485 AddStandardCompilePasses(Passes);
486 StandardCompileOpts = false;
489 if (StandardLinkOpts) {
490 AddStandardLinkPasses(Passes);
491 StandardLinkOpts = false;
495 AddOptimizationPasses(Passes, *FPasses, 1);
499 AddOptimizationPasses(Passes, *FPasses, 2);
503 AddOptimizationPasses(Passes, *FPasses, 3);
506 if (OptLevelO1 || OptLevelO2 || OptLevelO3) {
507 FPasses->doInitialization();
508 for (Module::iterator I = M.get()->begin(), E = M.get()->end();
513 // Check that the module is well formed on completion of optimization
514 if (!NoVerify && !VerifyEach)
515 Passes.add(createVerifierPass());
517 // Write bitcode out to disk or outs() as the last step...
518 if (!NoOutput && !AnalyzeOnly)
519 Passes.add(createBitcodeWriterPass(*Out));
521 // Now that we have all of the passes ready, run them.
522 Passes.run(*M.get());
524 // Delete the raw_fd_ostream.
529 } catch (const std::string& msg) {
530 errs() << argv[0] << ": " << msg << "\n";
532 errs() << argv[0] << ": Unexpected unknown exception occurred.\n";