1 //===- opt.cpp - The LLVM Modular Optimizer -------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // Optimizations may be specified an arbitrary number of times on the command
11 // line, They are run in the order specified.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #include "llvm/IR/LLVMContext.h"
16 #include "llvm/ADT/StringSet.h"
17 #include "llvm/ADT/Triple.h"
18 #include "llvm/Analysis/CallGraph.h"
19 #include "llvm/Analysis/CallGraphSCCPass.h"
20 #include "llvm/Analysis/LoopPass.h"
21 #include "llvm/Analysis/RegionPass.h"
22 #include "llvm/Analysis/Verifier.h"
23 #include "llvm/Assembly/PrintModulePass.h"
24 #include "llvm/Bitcode/ReaderWriter.h"
25 #include "llvm/CodeGen/CommandFlags.h"
26 #include "llvm/DebugInfo.h"
27 #include "llvm/IR/DataLayout.h"
28 #include "llvm/IR/Module.h"
29 #include "llvm/IRReader/IRReader.h"
30 #include "llvm/LinkAllIR.h"
31 #include "llvm/LinkAllPasses.h"
32 #include "llvm/MC/SubtargetFeature.h"
33 #include "llvm/PassManager.h"
34 #include "llvm/Support/Debug.h"
35 #include "llvm/Support/ManagedStatic.h"
36 #include "llvm/Support/PassNameParser.h"
37 #include "llvm/Support/PluginLoader.h"
38 #include "llvm/Support/PrettyStackTrace.h"
39 #include "llvm/Support/Signals.h"
40 #include "llvm/Support/SourceMgr.h"
41 #include "llvm/Support/SystemUtils.h"
42 #include "llvm/Support/TargetRegistry.h"
43 #include "llvm/Support/TargetSelect.h"
44 #include "llvm/Support/ToolOutputFile.h"
45 #include "llvm/Target/TargetLibraryInfo.h"
46 #include "llvm/Target/TargetMachine.h"
47 #include "llvm/Transforms/IPO/PassManagerBuilder.h"
48 #include <algorithm>
49 #include <memory>
50 using namespace llvm;
51
52 // The OptimizationList is automatically populated with registered Passes by the
53 // PassNameParser.
54 //
55 static cl::list<const PassInfo*, bool, PassNameParser>
56 PassList(cl::desc("Optimizations available:"));
57
58 // Other command line options...
59 //
60 static cl::opt<std::string>
61 InputFilename(cl::Positional, cl::desc("<input bitcode file>"),
62 cl::init("-"), cl::value_desc("filename"));
63
64 static cl::opt<std::string>
65 OutputFilename("o", cl::desc("Override output filename"),
66 cl::value_desc("filename"));
67
68 static cl::opt<bool>
69 Force("f", cl::desc("Enable binary output on terminals"));
70
71 static cl::opt<bool>
72 PrintEachXForm("p", cl::desc("Print module after each transformation"));
73
74 static cl::opt<bool>
75 NoOutput("disable-output",
76 cl::desc("Do not write result bitcode file"), cl::Hidden);
77
78 static cl::opt<bool>
79 OutputAssembly("S", cl::desc("Write output as LLVM assembly"));
80
81 static cl::opt<bool>
82 NoVerify("disable-verify", cl::desc("Do not verify result module"), cl::Hidden);
83
84 static cl::opt<bool>
85 VerifyEach("verify-each", cl::desc("Verify after each transform"));
86
87 static cl::opt<bool>
88 StripDebug("strip-debug",
89 cl::desc("Strip debugger symbol info from translation unit"));
90
91 static cl::opt<bool>
92 DisableInline("disable-inlining", cl::desc("Do not run the inliner pass"));
93
94 static cl::opt<bool>
95 DisableOptimizations("disable-opt",
96 cl::desc("Do not run any optimization passes"));
97
98 static cl::opt<bool>
99 DisableInternalize("disable-internalize",
100 cl::desc("Do not mark all symbols as internal"));
101
102 static cl::opt<bool>
103 StandardCompileOpts("std-compile-opts",
104 cl::desc("Include the standard compile time optimizations"));
105
106 static cl::opt<bool>
107 StandardLinkOpts("std-link-opts",
108 cl::desc("Include the standard link time optimizations"));
109
110 static cl::opt<bool>
111 OptLevelO1("O1",
112 cl::desc("Optimization level 1. Similar to clang -O1"));
113
114 static cl::opt<bool>
115 OptLevelO2("O2",
116 cl::desc("Optimization level 2. Similar to clang -O2"));
117
118 static cl::opt<bool>
119 OptLevelOs("Os",
120 cl::desc("Like -O2 with extra optimizations for size. Similar to clang -Os"));
121
122 static cl::opt<bool>
123 OptLevelOz("Oz",
124 cl::desc("Like -Os but reduces code size further. Similar to clang -Oz"));
125
126 static cl::opt<bool>
127 OptLevelO3("O3",
128 cl::desc("Optimization level 3. Similar to clang -O3"));
129
130 static cl::opt<std::string>
131 TargetTriple("mtriple", cl::desc("Override target triple for module"));
132
133 static cl::opt<bool>
134 UnitAtATime("funit-at-a-time",
135 cl::desc("Enable IPO. This is same as llvm-gcc's -funit-at-a-time"),
136 cl::init(true));
137
138 static cl::opt<bool>
139 DisableLoopUnrolling("disable-loop-unrolling",
140 cl::desc("Disable loop unrolling in all relevant passes"),
141 cl::init(false));
142 static cl::opt<bool>
143 DisableLoopVectorization("disable-loop-vectorization",
144 cl::desc("Disable the loop vectorization pass"),
145 cl::init(false));
146
147 static cl::opt<bool>
148 DisableSLPVectorization("disable-slp-vectorization",
149 cl::desc("Disable the slp vectorization pass"),
150 cl::init(false));
151
152
153 static cl::opt<bool>
154 DisableSimplifyLibCalls("disable-simplify-libcalls",
155 cl::desc("Disable simplify-libcalls"));
156
157 static cl::opt<bool>
158 Quiet("q", cl::desc("Obsolete option"), cl::Hidden);
159
160 static cl::alias
161 QuietA("quiet", cl::desc("Alias for -q"), cl::aliasopt(Quiet));
162
163 static cl::opt<bool>
164 AnalyzeOnly("analyze", cl::desc("Only perform analysis, no optimization"));
165
166 static cl::opt<bool>
167 PrintBreakpoints("print-breakpoints-for-testing",
168 cl::desc("Print select breakpoints location for testing"));
169
170 static cl::opt<std::string>
171 DefaultDataLayout("default-data-layout",
172 cl::desc("data layout string to use if not specified by module"),
173 cl::value_desc("layout-string"), cl::init(""));
174
175 // ---------- Define Printers for module and function passes ------------
176 namespace {
177
178 struct CallGraphSCCPassPrinter : public CallGraphSCCPass {
179 static char ID;
180 const PassInfo *PassToPrint;
181 raw_ostream &Out;
182 std::string PassName;
183
CallGraphSCCPassPrinter__anone1c435b80111::CallGraphSCCPassPrinter184 CallGraphSCCPassPrinter(const PassInfo *PI, raw_ostream &out) :
185 CallGraphSCCPass(ID), PassToPrint(PI), Out(out) {
186 std::string PassToPrintName = PassToPrint->getPassName();
187 PassName = "CallGraphSCCPass Printer: " + PassToPrintName;
188 }
189
runOnSCC__anone1c435b80111::CallGraphSCCPassPrinter190 virtual bool runOnSCC(CallGraphSCC &SCC) {
191 if (!Quiet)
192 Out << "Printing analysis '" << PassToPrint->getPassName() << "':\n";
193
194 // Get and print pass...
195 for (CallGraphSCC::iterator I = SCC.begin(), E = SCC.end(); I != E; ++I) {
196 Function *F = (*I)->getFunction();
197 if (F)
198 getAnalysisID<Pass>(PassToPrint->getTypeInfo()).print(Out,
199 F->getParent());
200 }
201 return false;
202 }
203
getPassName__anone1c435b80111::CallGraphSCCPassPrinter204 virtual const char *getPassName() const { return PassName.c_str(); }
205
getAnalysisUsage__anone1c435b80111::CallGraphSCCPassPrinter206 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
207 AU.addRequiredID(PassToPrint->getTypeInfo());
208 AU.setPreservesAll();
209 }
210 };
211
212 char CallGraphSCCPassPrinter::ID = 0;
213
214 struct ModulePassPrinter : public ModulePass {
215 static char ID;
216 const PassInfo *PassToPrint;
217 raw_ostream &Out;
218 std::string PassName;
219
ModulePassPrinter__anone1c435b80111::ModulePassPrinter220 ModulePassPrinter(const PassInfo *PI, raw_ostream &out)
221 : ModulePass(ID), PassToPrint(PI), Out(out) {
222 std::string PassToPrintName = PassToPrint->getPassName();
223 PassName = "ModulePass Printer: " + PassToPrintName;
224 }
225
runOnModule__anone1c435b80111::ModulePassPrinter226 virtual bool runOnModule(Module &M) {
227 if (!Quiet)
228 Out << "Printing analysis '" << PassToPrint->getPassName() << "':\n";
229
230 // Get and print pass...
231 getAnalysisID<Pass>(PassToPrint->getTypeInfo()).print(Out, &M);
232 return false;
233 }
234
getPassName__anone1c435b80111::ModulePassPrinter235 virtual const char *getPassName() const { return PassName.c_str(); }
236
getAnalysisUsage__anone1c435b80111::ModulePassPrinter237 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
238 AU.addRequiredID(PassToPrint->getTypeInfo());
239 AU.setPreservesAll();
240 }
241 };
242
243 char ModulePassPrinter::ID = 0;
244 struct FunctionPassPrinter : public FunctionPass {
245 const PassInfo *PassToPrint;
246 raw_ostream &Out;
247 static char ID;
248 std::string PassName;
249
FunctionPassPrinter__anone1c435b80111::FunctionPassPrinter250 FunctionPassPrinter(const PassInfo *PI, raw_ostream &out)
251 : FunctionPass(ID), PassToPrint(PI), Out(out) {
252 std::string PassToPrintName = PassToPrint->getPassName();
253 PassName = "FunctionPass Printer: " + PassToPrintName;
254 }
255
runOnFunction__anone1c435b80111::FunctionPassPrinter256 virtual bool runOnFunction(Function &F) {
257 if (!Quiet)
258 Out << "Printing analysis '" << PassToPrint->getPassName()
259 << "' for function '" << F.getName() << "':\n";
260
261 // Get and print pass...
262 getAnalysisID<Pass>(PassToPrint->getTypeInfo()).print(Out,
263 F.getParent());
264 return false;
265 }
266
getPassName__anone1c435b80111::FunctionPassPrinter267 virtual const char *getPassName() const { return PassName.c_str(); }
268
getAnalysisUsage__anone1c435b80111::FunctionPassPrinter269 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
270 AU.addRequiredID(PassToPrint->getTypeInfo());
271 AU.setPreservesAll();
272 }
273 };
274
275 char FunctionPassPrinter::ID = 0;
276
277 struct LoopPassPrinter : public LoopPass {
278 static char ID;
279 const PassInfo *PassToPrint;
280 raw_ostream &Out;
281 std::string PassName;
282
LoopPassPrinter__anone1c435b80111::LoopPassPrinter283 LoopPassPrinter(const PassInfo *PI, raw_ostream &out) :
284 LoopPass(ID), PassToPrint(PI), Out(out) {
285 std::string PassToPrintName = PassToPrint->getPassName();
286 PassName = "LoopPass Printer: " + PassToPrintName;
287 }
288
289
runOnLoop__anone1c435b80111::LoopPassPrinter290 virtual bool runOnLoop(Loop *L, LPPassManager &LPM) {
291 if (!Quiet)
292 Out << "Printing analysis '" << PassToPrint->getPassName() << "':\n";
293
294 // Get and print pass...
295 getAnalysisID<Pass>(PassToPrint->getTypeInfo()).print(Out,
296 L->getHeader()->getParent()->getParent());
297 return false;
298 }
299
getPassName__anone1c435b80111::LoopPassPrinter300 virtual const char *getPassName() const { return PassName.c_str(); }
301
getAnalysisUsage__anone1c435b80111::LoopPassPrinter302 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
303 AU.addRequiredID(PassToPrint->getTypeInfo());
304 AU.setPreservesAll();
305 }
306 };
307
308 char LoopPassPrinter::ID = 0;
309
310 struct RegionPassPrinter : public RegionPass {
311 static char ID;
312 const PassInfo *PassToPrint;
313 raw_ostream &Out;
314 std::string PassName;
315
RegionPassPrinter__anone1c435b80111::RegionPassPrinter316 RegionPassPrinter(const PassInfo *PI, raw_ostream &out) : RegionPass(ID),
317 PassToPrint(PI), Out(out) {
318 std::string PassToPrintName = PassToPrint->getPassName();
319 PassName = "RegionPass Printer: " + PassToPrintName;
320 }
321
runOnRegion__anone1c435b80111::RegionPassPrinter322 virtual bool runOnRegion(Region *R, RGPassManager &RGM) {
323 if (!Quiet) {
324 Out << "Printing analysis '" << PassToPrint->getPassName() << "' for "
325 << "region: '" << R->getNameStr() << "' in function '"
326 << R->getEntry()->getParent()->getName() << "':\n";
327 }
328 // Get and print pass...
329 getAnalysisID<Pass>(PassToPrint->getTypeInfo()).print(Out,
330 R->getEntry()->getParent()->getParent());
331 return false;
332 }
333
getPassName__anone1c435b80111::RegionPassPrinter334 virtual const char *getPassName() const { return PassName.c_str(); }
335
getAnalysisUsage__anone1c435b80111::RegionPassPrinter336 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
337 AU.addRequiredID(PassToPrint->getTypeInfo());
338 AU.setPreservesAll();
339 }
340 };
341
342 char RegionPassPrinter::ID = 0;
343
344 struct BasicBlockPassPrinter : public BasicBlockPass {
345 const PassInfo *PassToPrint;
346 raw_ostream &Out;
347 static char ID;
348 std::string PassName;
349
BasicBlockPassPrinter__anone1c435b80111::BasicBlockPassPrinter350 BasicBlockPassPrinter(const PassInfo *PI, raw_ostream &out)
351 : BasicBlockPass(ID), PassToPrint(PI), Out(out) {
352 std::string PassToPrintName = PassToPrint->getPassName();
353 PassName = "BasicBlockPass Printer: " + PassToPrintName;
354 }
355
runOnBasicBlock__anone1c435b80111::BasicBlockPassPrinter356 virtual bool runOnBasicBlock(BasicBlock &BB) {
357 if (!Quiet)
358 Out << "Printing Analysis info for BasicBlock '" << BB.getName()
359 << "': Pass " << PassToPrint->getPassName() << ":\n";
360
361 // Get and print pass...
362 getAnalysisID<Pass>(PassToPrint->getTypeInfo()).print(Out,
363 BB.getParent()->getParent());
364 return false;
365 }
366
getPassName__anone1c435b80111::BasicBlockPassPrinter367 virtual const char *getPassName() const { return PassName.c_str(); }
368
getAnalysisUsage__anone1c435b80111::BasicBlockPassPrinter369 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
370 AU.addRequiredID(PassToPrint->getTypeInfo());
371 AU.setPreservesAll();
372 }
373 };
374
375 char BasicBlockPassPrinter::ID = 0;
376
377 struct BreakpointPrinter : public ModulePass {
378 raw_ostream &Out;
379 static char ID;
380 DITypeIdentifierMap TypeIdentifierMap;
381
BreakpointPrinter__anone1c435b80111::BreakpointPrinter382 BreakpointPrinter(raw_ostream &out)
383 : ModulePass(ID), Out(out) {
384 }
385
getContextName__anone1c435b80111::BreakpointPrinter386 void getContextName(DIDescriptor Context, std::string &N) {
387 if (Context.isNameSpace()) {
388 DINameSpace NS(Context);
389 if (!NS.getName().empty()) {
390 getContextName(NS.getContext(), N);
391 N = N + NS.getName().str() + "::";
392 }
393 } else if (Context.isType()) {
394 DIType TY(Context);
395 if (!TY.getName().empty()) {
396 getContextName(TY.getContext().resolve(TypeIdentifierMap), N);
397 N = N + TY.getName().str() + "::";
398 }
399 }
400 }
401
runOnModule__anone1c435b80111::BreakpointPrinter402 virtual bool runOnModule(Module &M) {
403 TypeIdentifierMap.clear();
404 NamedMDNode *CU_Nodes = M.getNamedMetadata("llvm.dbg.cu");
405 if (CU_Nodes)
406 TypeIdentifierMap = generateDITypeIdentifierMap(CU_Nodes);
407
408 StringSet<> Processed;
409 if (NamedMDNode *NMD = M.getNamedMetadata("llvm.dbg.sp"))
410 for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
411 std::string Name;
412 DISubprogram SP(NMD->getOperand(i));
413 assert((!SP || SP.isSubprogram()) &&
414 "A MDNode in llvm.dbg.sp should be null or a DISubprogram.");
415 if (!SP)
416 continue;
417 getContextName(SP.getContext().resolve(TypeIdentifierMap), Name);
418 Name = Name + SP.getDisplayName().str();
419 if (!Name.empty() && Processed.insert(Name)) {
420 Out << Name << "\n";
421 }
422 }
423 return false;
424 }
425
getAnalysisUsage__anone1c435b80111::BreakpointPrinter426 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
427 AU.setPreservesAll();
428 }
429 };
430
431 } // anonymous namespace
432
433 char BreakpointPrinter::ID = 0;
434
addPass(PassManagerBase & PM,Pass * P)435 static inline void addPass(PassManagerBase &PM, Pass *P) {
436 // Add the pass to the pass manager...
437 PM.add(P);
438
439 // If we are verifying all of the intermediate steps, add the verifier...
440 if (VerifyEach) PM.add(createVerifierPass());
441 }
442
443 /// AddOptimizationPasses - This routine adds optimization passes
444 /// based on selected optimization level, OptLevel. This routine
445 /// duplicates llvm-gcc behaviour.
446 ///
447 /// OptLevel - Optimization Level
AddOptimizationPasses(PassManagerBase & MPM,FunctionPassManager & FPM,unsigned OptLevel,unsigned SizeLevel)448 static void AddOptimizationPasses(PassManagerBase &MPM,FunctionPassManager &FPM,
449 unsigned OptLevel, unsigned SizeLevel) {
450 FPM.add(createVerifierPass()); // Verify that input is correct
451
452 PassManagerBuilder Builder;
453 Builder.OptLevel = OptLevel;
454 Builder.SizeLevel = SizeLevel;
455
456 if (DisableInline) {
457 // No inlining pass
458 } else if (OptLevel > 1) {
459 unsigned Threshold = 225;
460 if (SizeLevel == 1) // -Os
461 Threshold = 75;
462 else if (SizeLevel == 2) // -Oz
463 Threshold = 25;
464 if (OptLevel > 2)
465 Threshold = 275;
466 Builder.Inliner = createFunctionInliningPass(Threshold);
467 } else {
468 Builder.Inliner = createAlwaysInlinerPass();
469 }
470 Builder.DisableUnitAtATime = !UnitAtATime;
471 Builder.DisableUnrollLoops = (DisableLoopUnrolling.getNumOccurrences() > 0) ?
472 DisableLoopUnrolling : OptLevel == 0;
473
474 Builder.LoopVectorize =
475 DisableLoopVectorization ? false : OptLevel > 1 && SizeLevel < 2;
476 Builder.SLPVectorize =
477 DisableSLPVectorization ? false : OptLevel > 1 && SizeLevel < 2;
478
479 Builder.populateFunctionPassManager(FPM);
480 Builder.populateModulePassManager(MPM);
481 }
482
AddStandardCompilePasses(PassManagerBase & PM)483 static void AddStandardCompilePasses(PassManagerBase &PM) {
484 PM.add(createVerifierPass()); // Verify that input is correct
485
486 // If the -strip-debug command line option was specified, do it.
487 if (StripDebug)
488 addPass(PM, createStripSymbolsPass(true));
489
490 if (DisableOptimizations) return;
491
492 // -std-compile-opts adds the same module passes as -O3.
493 PassManagerBuilder Builder;
494 if (!DisableInline)
495 Builder.Inliner = createFunctionInliningPass();
496 Builder.OptLevel = 3;
497 Builder.populateModulePassManager(PM);
498 }
499
AddStandardLinkPasses(PassManagerBase & PM)500 static void AddStandardLinkPasses(PassManagerBase &PM) {
501 PM.add(createVerifierPass()); // Verify that input is correct
502
503 // If the -strip-debug command line option was specified, do it.
504 if (StripDebug)
505 addPass(PM, createStripSymbolsPass(true));
506
507 if (DisableOptimizations) return;
508
509 PassManagerBuilder Builder;
510 Builder.populateLTOPassManager(PM, /*Internalize=*/ !DisableInternalize,
511 /*RunInliner=*/ !DisableInline);
512 }
513
514 //===----------------------------------------------------------------------===//
515 // CodeGen-related helper functions.
516 //
GetTargetOptions()517 static TargetOptions GetTargetOptions() {
518 TargetOptions Options;
519 Options.LessPreciseFPMADOption = EnableFPMAD;
520 Options.NoFramePointerElim = DisableFPElim;
521 Options.AllowFPOpFusion = FuseFPOps;
522 Options.UnsafeFPMath = EnableUnsafeFPMath;
523 Options.NoInfsFPMath = EnableNoInfsFPMath;
524 Options.NoNaNsFPMath = EnableNoNaNsFPMath;
525 Options.HonorSignDependentRoundingFPMathOption =
526 EnableHonorSignDependentRoundingFPMath;
527 Options.UseSoftFloat = GenerateSoftFloatCalls;
528 if (FloatABIForCalls != FloatABI::Default)
529 Options.FloatABIType = FloatABIForCalls;
530 Options.NoZerosInBSS = DontPlaceZerosInBSS;
531 Options.GuaranteedTailCallOpt = EnableGuaranteedTailCallOpt;
532 Options.DisableTailCalls = DisableTailCalls;
533 Options.StackAlignmentOverride = OverrideStackAlignment;
534 Options.TrapFuncName = TrapFuncName;
535 Options.PositionIndependentExecutable = EnablePIE;
536 Options.EnableSegmentedStacks = SegmentedStacks;
537 Options.UseInitArray = UseInitArray;
538 return Options;
539 }
540
GetCodeGenOptLevel()541 CodeGenOpt::Level GetCodeGenOptLevel() {
542 if (OptLevelO1)
543 return CodeGenOpt::Less;
544 if (OptLevelO2)
545 return CodeGenOpt::Default;
546 if (OptLevelO3)
547 return CodeGenOpt::Aggressive;
548 return CodeGenOpt::None;
549 }
550
551 // Returns the TargetMachine instance or zero if no triple is provided.
GetTargetMachine(Triple TheTriple)552 static TargetMachine* GetTargetMachine(Triple TheTriple) {
553 std::string Error;
554 const Target *TheTarget = TargetRegistry::lookupTarget(MArch, TheTriple,
555 Error);
556 // Some modules don't specify a triple, and this is okay.
557 if (!TheTarget) {
558 return 0;
559 }
560
561 // Package up features to be passed to target/subtarget
562 std::string FeaturesStr;
563 if (MAttrs.size()) {
564 SubtargetFeatures Features;
565 for (unsigned i = 0; i != MAttrs.size(); ++i)
566 Features.AddFeature(MAttrs[i]);
567 FeaturesStr = Features.getString();
568 }
569
570 return TheTarget->createTargetMachine(TheTriple.getTriple(),
571 MCPU, FeaturesStr, GetTargetOptions(),
572 RelocModel, CMModel,
573 GetCodeGenOptLevel());
574 }
575
576 //===----------------------------------------------------------------------===//
577 // main for opt
578 //
main(int argc,char ** argv)579 int main(int argc, char **argv) {
580 sys::PrintStackTraceOnErrorSignal();
581 llvm::PrettyStackTraceProgram X(argc, argv);
582
583 // Enable debug stream buffering.
584 EnableDebugBuffering = true;
585
586 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
587 LLVMContext &Context = getGlobalContext();
588
589 InitializeAllTargets();
590 InitializeAllTargetMCs();
591
592 // Initialize passes
593 PassRegistry &Registry = *PassRegistry::getPassRegistry();
594 initializeCore(Registry);
595 initializeDebugIRPass(Registry);
596 initializeScalarOpts(Registry);
597 initializeObjCARCOpts(Registry);
598 initializeVectorization(Registry);
599 initializeIPO(Registry);
600 initializeAnalysis(Registry);
601 initializeIPA(Registry);
602 initializeTransformUtils(Registry);
603 initializeInstCombine(Registry);
604 initializeInstrumentation(Registry);
605 initializeTarget(Registry);
606
607 cl::ParseCommandLineOptions(argc, argv,
608 "llvm .bc -> .bc modular optimizer and analysis printer\n");
609
610 if (AnalyzeOnly && NoOutput) {
611 errs() << argv[0] << ": analyze mode conflicts with no-output mode.\n";
612 return 1;
613 }
614
615 SMDiagnostic Err;
616
617 // Load the input module...
618 OwningPtr<Module> M;
619 M.reset(ParseIRFile(InputFilename, Err, Context));
620
621 if (M.get() == 0) {
622 Err.print(argv[0], errs());
623 return 1;
624 }
625
626 // If we are supposed to override the target triple, do so now.
627 if (!TargetTriple.empty())
628 M->setTargetTriple(Triple::normalize(TargetTriple));
629
630 // Figure out what stream we are supposed to write to...
631 OwningPtr<tool_output_file> Out;
632 if (NoOutput) {
633 if (!OutputFilename.empty())
634 errs() << "WARNING: The -o (output filename) option is ignored when\n"
635 "the --disable-output option is used.\n";
636 } else {
637 // Default to standard output.
638 if (OutputFilename.empty())
639 OutputFilename = "-";
640
641 std::string ErrorInfo;
642 Out.reset(new tool_output_file(OutputFilename.c_str(), ErrorInfo,
643 sys::fs::F_Binary));
644 if (!ErrorInfo.empty()) {
645 errs() << ErrorInfo << '\n';
646 return 1;
647 }
648 }
649
650 // If the output is set to be emitted to standard out, and standard out is a
651 // console, print out a warning message and refuse to do it. We don't
652 // impress anyone by spewing tons of binary goo to a terminal.
653 if (!Force && !NoOutput && !AnalyzeOnly && !OutputAssembly)
654 if (CheckBitcodeOutputToConsole(Out->os(), !Quiet))
655 NoOutput = true;
656
657 // Create a PassManager to hold and optimize the collection of passes we are
658 // about to build.
659 //
660 PassManager Passes;
661
662 // Add an appropriate TargetLibraryInfo pass for the module's triple.
663 TargetLibraryInfo *TLI = new TargetLibraryInfo(Triple(M->getTargetTriple()));
664
665 // The -disable-simplify-libcalls flag actually disables all builtin optzns.
666 if (DisableSimplifyLibCalls)
667 TLI->disableAllFunctions();
668 Passes.add(TLI);
669
670 // Add an appropriate DataLayout instance for this module.
671 DataLayout *TD = 0;
672 const std::string &ModuleDataLayout = M.get()->getDataLayout();
673 if (!ModuleDataLayout.empty())
674 TD = new DataLayout(ModuleDataLayout);
675 else if (!DefaultDataLayout.empty())
676 TD = new DataLayout(DefaultDataLayout);
677
678 if (TD)
679 Passes.add(TD);
680
681 Triple ModuleTriple(M->getTargetTriple());
682 TargetMachine *Machine = 0;
683 if (ModuleTriple.getArch())
684 Machine = GetTargetMachine(Triple(ModuleTriple));
685 OwningPtr<TargetMachine> TM(Machine);
686
687 // Add internal analysis passes from the target machine.
688 if (TM.get())
689 TM->addAnalysisPasses(Passes);
690
691 OwningPtr<FunctionPassManager> FPasses;
692 if (OptLevelO1 || OptLevelO2 || OptLevelOs || OptLevelOz || OptLevelO3) {
693 FPasses.reset(new FunctionPassManager(M.get()));
694 if (TD)
695 FPasses->add(new DataLayout(*TD));
696 if (TM.get())
697 TM->addAnalysisPasses(*FPasses);
698
699 }
700
701 if (PrintBreakpoints) {
702 // Default to standard output.
703 if (!Out) {
704 if (OutputFilename.empty())
705 OutputFilename = "-";
706
707 std::string ErrorInfo;
708 Out.reset(new tool_output_file(OutputFilename.c_str(), ErrorInfo,
709 sys::fs::F_Binary));
710 if (!ErrorInfo.empty()) {
711 errs() << ErrorInfo << '\n';
712 return 1;
713 }
714 }
715 Passes.add(new BreakpointPrinter(Out->os()));
716 NoOutput = true;
717 }
718
719 // If the -strip-debug command line option was specified, add it. If
720 // -std-compile-opts was also specified, it will handle StripDebug.
721 if (StripDebug && !StandardCompileOpts)
722 addPass(Passes, createStripSymbolsPass(true));
723
724 // Create a new optimization pass for each one specified on the command line
725 for (unsigned i = 0; i < PassList.size(); ++i) {
726 // Check to see if -std-compile-opts was specified before this option. If
727 // so, handle it.
728 if (StandardCompileOpts &&
729 StandardCompileOpts.getPosition() < PassList.getPosition(i)) {
730 AddStandardCompilePasses(Passes);
731 StandardCompileOpts = false;
732 }
733
734 if (StandardLinkOpts &&
735 StandardLinkOpts.getPosition() < PassList.getPosition(i)) {
736 AddStandardLinkPasses(Passes);
737 StandardLinkOpts = false;
738 }
739
740 if (OptLevelO1 && OptLevelO1.getPosition() < PassList.getPosition(i)) {
741 AddOptimizationPasses(Passes, *FPasses, 1, 0);
742 OptLevelO1 = false;
743 }
744
745 if (OptLevelO2 && OptLevelO2.getPosition() < PassList.getPosition(i)) {
746 AddOptimizationPasses(Passes, *FPasses, 2, 0);
747 OptLevelO2 = false;
748 }
749
750 if (OptLevelOs && OptLevelOs.getPosition() < PassList.getPosition(i)) {
751 AddOptimizationPasses(Passes, *FPasses, 2, 1);
752 OptLevelOs = false;
753 }
754
755 if (OptLevelOz && OptLevelOz.getPosition() < PassList.getPosition(i)) {
756 AddOptimizationPasses(Passes, *FPasses, 2, 2);
757 OptLevelOz = false;
758 }
759
760 if (OptLevelO3 && OptLevelO3.getPosition() < PassList.getPosition(i)) {
761 AddOptimizationPasses(Passes, *FPasses, 3, 0);
762 OptLevelO3 = false;
763 }
764
765 const PassInfo *PassInf = PassList[i];
766 Pass *P = 0;
767 if (PassInf->getNormalCtor())
768 P = PassInf->getNormalCtor()();
769 else
770 errs() << argv[0] << ": cannot create pass: "
771 << PassInf->getPassName() << "\n";
772 if (P) {
773 PassKind Kind = P->getPassKind();
774 addPass(Passes, P);
775
776 if (AnalyzeOnly) {
777 switch (Kind) {
778 case PT_BasicBlock:
779 Passes.add(new BasicBlockPassPrinter(PassInf, Out->os()));
780 break;
781 case PT_Region:
782 Passes.add(new RegionPassPrinter(PassInf, Out->os()));
783 break;
784 case PT_Loop:
785 Passes.add(new LoopPassPrinter(PassInf, Out->os()));
786 break;
787 case PT_Function:
788 Passes.add(new FunctionPassPrinter(PassInf, Out->os()));
789 break;
790 case PT_CallGraphSCC:
791 Passes.add(new CallGraphSCCPassPrinter(PassInf, Out->os()));
792 break;
793 default:
794 Passes.add(new ModulePassPrinter(PassInf, Out->os()));
795 break;
796 }
797 }
798 }
799
800 if (PrintEachXForm)
801 Passes.add(createPrintModulePass(&errs()));
802 }
803
804 // If -std-compile-opts was specified at the end of the pass list, add them.
805 if (StandardCompileOpts) {
806 AddStandardCompilePasses(Passes);
807 StandardCompileOpts = false;
808 }
809
810 if (StandardLinkOpts) {
811 AddStandardLinkPasses(Passes);
812 StandardLinkOpts = false;
813 }
814
815 if (OptLevelO1)
816 AddOptimizationPasses(Passes, *FPasses, 1, 0);
817
818 if (OptLevelO2)
819 AddOptimizationPasses(Passes, *FPasses, 2, 0);
820
821 if (OptLevelOs)
822 AddOptimizationPasses(Passes, *FPasses, 2, 1);
823
824 if (OptLevelOz)
825 AddOptimizationPasses(Passes, *FPasses, 2, 2);
826
827 if (OptLevelO3)
828 AddOptimizationPasses(Passes, *FPasses, 3, 0);
829
830 if (OptLevelO1 || OptLevelO2 || OptLevelOs || OptLevelOz || OptLevelO3) {
831 FPasses->doInitialization();
832 for (Module::iterator F = M->begin(), E = M->end(); F != E; ++F)
833 FPasses->run(*F);
834 FPasses->doFinalization();
835 }
836
837 // Check that the module is well formed on completion of optimization
838 if (!NoVerify && !VerifyEach)
839 Passes.add(createVerifierPass());
840
841 // Write bitcode or assembly to the output as the last step...
842 if (!NoOutput && !AnalyzeOnly) {
843 if (OutputAssembly)
844 Passes.add(createPrintModulePass(&Out->os()));
845 else
846 Passes.add(createBitcodeWriterPass(Out->os()));
847 }
848
849 // Before executing passes, print the final values of the LLVM options.
850 cl::PrintOptionValues();
851
852 // Now that we have all of the passes ready, run them.
853 Passes.run(*M.get());
854
855 // Declare success.
856 if (!NoOutput || PrintBreakpoints)
857 Out->keep();
858
859 return 0;
860 }
861