AsmPrinter.cpp revision 052348ee1a841a7ba39d49ccb39b66903908f7e3 
1//===-- AsmPrinter.cpp - Common AsmPrinter code ---------------------------===//
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// This file implements the AsmPrinter class.
11//
12//===----------------------------------------------------------------------===//
13
14#include "llvm/CodeGen/AsmPrinter.h"
15#include "llvm/Assembly/Writer.h"
16#include "llvm/DerivedTypes.h"
17#include "llvm/Constants.h"
18#include "llvm/Module.h"
19#include "llvm/CodeGen/DwarfWriter.h"
20#include "llvm/CodeGen/GCMetadataPrinter.h"
21#include "llvm/CodeGen/MachineConstantPool.h"
22#include "llvm/CodeGen/MachineFrameInfo.h"
23#include "llvm/CodeGen/MachineFunction.h"
24#include "llvm/CodeGen/MachineJumpTableInfo.h"
25#include "llvm/CodeGen/MachineLoopInfo.h"
26#include "llvm/CodeGen/MachineModuleInfo.h"
27#include "llvm/Analysis/DebugInfo.h"
28#include "llvm/MC/MCContext.h"
29#include "llvm/MC/MCInst.h"
30#include "llvm/MC/MCSection.h"
31#include "llvm/MC/MCStreamer.h"
32#include "llvm/MC/MCSymbol.h"
33#include "llvm/Support/CommandLine.h"
34#include "llvm/Support/ErrorHandling.h"
35#include "llvm/Support/Format.h"
36#include "llvm/Support/FormattedStream.h"
37#include "llvm/MC/MCAsmInfo.h"
38#include "llvm/Target/Mangler.h"
39#include "llvm/Target/TargetData.h"
40#include "llvm/Target/TargetInstrInfo.h"
41#include "llvm/Target/TargetLowering.h"
42#include "llvm/Target/TargetLoweringObjectFile.h"
43#include "llvm/Target/TargetOptions.h"
44#include "llvm/Target/TargetRegisterInfo.h"
45#include "llvm/ADT/SmallPtrSet.h"
46#include "llvm/ADT/SmallString.h"
47#include <cerrno>
48using namespace llvm;
49
50static cl::opt<cl::boolOrDefault>
51AsmVerbose("asm-verbose", cl::desc("Add comments to directives."),
52           cl::init(cl::BOU_UNSET));
53
54static bool getVerboseAsm(bool VDef) {
55  switch (AsmVerbose) {
56  default:
57  case cl::BOU_UNSET: return VDef;
58  case cl::BOU_TRUE:  return true;
59  case cl::BOU_FALSE: return false;
60  }
61}
62
63char AsmPrinter::ID = 0;
64AsmPrinter::AsmPrinter(formatted_raw_ostream &o, TargetMachine &tm,
65                       const MCAsmInfo *T, bool VDef)
66  : MachineFunctionPass(&ID), FunctionNumber(0), O(o),
67    TM(tm), MAI(T), TRI(tm.getRegisterInfo()),
68
69    OutContext(*new MCContext()),
70    // FIXME: Pass instprinter to streamer.
71    OutStreamer(*createAsmStreamer(OutContext, O, *T,
72                                   TM.getTargetData()->isLittleEndian(),
73                                   getVerboseAsm(VDef), 0)),
74
75    LastMI(0), LastFn(0), Counter(~0U), PrevDLT(NULL) {
76  DW = 0; MMI = 0;
77  VerboseAsm = getVerboseAsm(VDef);
78}
79
80AsmPrinter::~AsmPrinter() {
81  for (gcp_iterator I = GCMetadataPrinters.begin(),
82                    E = GCMetadataPrinters.end(); I != E; ++I)
83    delete I->second;
84
85  delete &OutStreamer;
86  delete &OutContext;
87}
88
89TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
90  return TM.getTargetLowering()->getObjFileLowering();
91}
92
93/// getCurrentSection() - Return the current section we are emitting to.
94const MCSection *AsmPrinter::getCurrentSection() const {
95  return OutStreamer.getCurrentSection();
96}
97
98
99void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
100  AU.setPreservesAll();
101  MachineFunctionPass::getAnalysisUsage(AU);
102  AU.addRequired<GCModuleInfo>();
103  if (VerboseAsm)
104    AU.addRequired<MachineLoopInfo>();
105}
106
107bool AsmPrinter::doInitialization(Module &M) {
108  // Initialize TargetLoweringObjectFile.
109  const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
110    .Initialize(OutContext, TM);
111
112  Mang = new Mangler(*MAI);
113
114  // Allow the target to emit any magic that it wants at the start of the file.
115  EmitStartOfAsmFile(M);
116
117  if (MAI->hasSingleParameterDotFile()) {
118    /* Very minimal debug info. It is ignored if we emit actual
119       debug info. If we don't, this at least helps the user find where
120       a function came from. */
121    O << "\t.file\t\"" << M.getModuleIdentifier() << "\"\n";
122  }
123
124  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
125  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
126  for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
127    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
128      MP->beginAssembly(O, *this, *MAI);
129
130  if (!M.getModuleInlineAsm().empty())
131    O << MAI->getCommentString() << " Start of file scope inline assembly\n"
132      << M.getModuleInlineAsm()
133      << '\n' << MAI->getCommentString()
134      << " End of file scope inline assembly\n";
135
136  MMI = getAnalysisIfAvailable<MachineModuleInfo>();
137  if (MMI)
138    MMI->AnalyzeModule(M);
139  DW = getAnalysisIfAvailable<DwarfWriter>();
140  if (DW)
141    DW->BeginModule(&M, MMI, O, this, MAI);
142
143  return false;
144}
145
146/// EmitGlobalVariable - Emit the specified global variable to the .s file.
147void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
148  if (!GV->hasInitializer())   // External globals require no code.
149    return;
150
151  // Check to see if this is a special global used by LLVM, if so, emit it.
152  if (EmitSpecialLLVMGlobal(GV))
153    return;
154
155  MCSymbol *GVSym = GetGlobalValueSymbol(GV);
156  printVisibility(GVSym, GV->getVisibility());
157
158  if (MAI->hasDotTypeDotSizeDirective()) {
159    O << "\t.type\t" << *GVSym;
160    if (MAI->getCommentString()[0] != '@')
161      O << ",@object\n";
162    else
163      O << ",%object\n";
164  }
165
166  SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
167
168  const TargetData *TD = TM.getTargetData();
169  unsigned Size = TD->getTypeAllocSize(GV->getType()->getElementType());
170  unsigned AlignLog = TD->getPreferredAlignmentLog(GV);
171
172  // Handle common and BSS local symbols (.lcomm).
173  if (GVKind.isCommon() || GVKind.isBSSLocal()) {
174    if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
175
176    if (VerboseAsm) {
177      WriteAsOperand(OutStreamer.GetCommentOS(), GV,
178                     /*PrintType=*/false, GV->getParent());
179      OutStreamer.GetCommentOS() << '\n';
180    }
181
182    // Handle common symbols.
183    if (GVKind.isCommon()) {
184      // .comm _foo, 42, 4
185      OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
186      return;
187    }
188
189    // Handle local BSS symbols.
190    if (MAI->hasMachoZeroFillDirective()) {
191      const MCSection *TheSection =
192        getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
193      // .zerofill __DATA, __bss, _foo, 400, 5
194      OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
195      return;
196    }
197
198    if (const char *LComm = MAI->getLCOMMDirective()) {
199      // .lcomm _foo, 42
200      O << LComm << *GVSym << ',' << Size;
201      O << '\n';
202      return;
203    }
204
205    // .local _foo
206    O << "\t.local\t" << *GVSym << '\n';
207    // .comm _foo, 42, 4
208    OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
209    return;
210  }
211
212  const MCSection *TheSection =
213    getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
214
215  // Handle the zerofill directive on darwin, which is a special form of BSS
216  // emission.
217  if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
218    // .globl _foo
219    OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
220    // .zerofill __DATA, __common, _foo, 400, 5
221    OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
222    return;
223  }
224
225  OutStreamer.SwitchSection(TheSection);
226
227  // TODO: Factor into an 'emit linkage' thing that is shared with function
228  // bodies.
229  switch (GV->getLinkage()) {
230  case GlobalValue::CommonLinkage:
231  case GlobalValue::LinkOnceAnyLinkage:
232  case GlobalValue::LinkOnceODRLinkage:
233  case GlobalValue::WeakAnyLinkage:
234  case GlobalValue::WeakODRLinkage:
235  case GlobalValue::LinkerPrivateLinkage:
236    if (MAI->getWeakDefDirective() != 0) {
237      // .globl _foo
238      OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
239      // .weak_definition _foo
240      OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::WeakDefinition);
241    } else if (const char *LinkOnce = MAI->getLinkOnceDirective()) {
242      // .globl _foo
243      OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
244      // .linkonce same_size
245      O << LinkOnce;
246    } else {
247      // .weak _foo
248      OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Weak);
249    }
250    break;
251  case GlobalValue::DLLExportLinkage:
252  case GlobalValue::AppendingLinkage:
253    // FIXME: appending linkage variables should go into a section of
254    // their name or something.  For now, just emit them as external.
255  case GlobalValue::ExternalLinkage:
256    // If external or appending, declare as a global symbol.
257    // .globl _foo
258    OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
259    break;
260  case GlobalValue::PrivateLinkage:
261  case GlobalValue::InternalLinkage:
262     break;
263  default:
264    llvm_unreachable("Unknown linkage type!");
265  }
266
267  EmitAlignment(AlignLog, GV);
268  if (VerboseAsm) {
269    WriteAsOperand(OutStreamer.GetCommentOS(), GV,
270                   /*PrintType=*/false, GV->getParent());
271    OutStreamer.GetCommentOS() << '\n';
272  }
273  OutStreamer.EmitLabel(GVSym);
274
275  EmitGlobalConstant(GV->getInitializer());
276
277  if (MAI->hasDotTypeDotSizeDirective())
278    O << "\t.size\t" << *GVSym << ", " << Size << '\n';
279
280  OutStreamer.AddBlankLine();
281}
282
283
284bool AsmPrinter::doFinalization(Module &M) {
285  // Emit global variables.
286  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
287       I != E; ++I)
288    EmitGlobalVariable(I);
289
290  // Emit final debug information.
291  if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
292    DW->EndModule();
293
294  // If the target wants to know about weak references, print them all.
295  if (MAI->getWeakRefDirective()) {
296    // FIXME: This is not lazy, it would be nice to only print weak references
297    // to stuff that is actually used.  Note that doing so would require targets
298    // to notice uses in operands (due to constant exprs etc).  This should
299    // happen with the MC stuff eventually.
300
301    // Print out module-level global variables here.
302    for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
303         I != E; ++I) {
304      if (!I->hasExternalWeakLinkage()) continue;
305      O << MAI->getWeakRefDirective() << *GetGlobalValueSymbol(I) << '\n';
306    }
307
308    for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
309      if (!I->hasExternalWeakLinkage()) continue;
310      O << MAI->getWeakRefDirective() << *GetGlobalValueSymbol(I) << '\n';
311    }
312  }
313
314  if (MAI->getSetDirective()) {
315    O << '\n';
316    for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
317         I != E; ++I) {
318      MCSymbol *Name = GetGlobalValueSymbol(I);
319
320      const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
321      MCSymbol *Target = GetGlobalValueSymbol(GV);
322
323      if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
324        O << "\t.globl\t" << *Name << '\n';
325      else if (I->hasWeakLinkage())
326        O << MAI->getWeakRefDirective() << *Name << '\n';
327      else
328        assert(I->hasLocalLinkage() && "Invalid alias linkage");
329
330      printVisibility(Name, I->getVisibility());
331
332      O << MAI->getSetDirective() << ' ' << *Name << ", " << *Target << '\n';
333    }
334  }
335
336  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
337  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
338  for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
339    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
340      MP->finishAssembly(O, *this, *MAI);
341
342  // If we don't have any trampolines, then we don't require stack memory
343  // to be executable. Some targets have a directive to declare this.
344  Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
345  if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
346    if (MAI->getNonexecutableStackDirective())
347      O << MAI->getNonexecutableStackDirective() << '\n';
348
349
350  // Allow the target to emit any magic that it wants at the end of the file,
351  // after everything else has gone out.
352  EmitEndOfAsmFile(M);
353
354  delete Mang; Mang = 0;
355  DW = 0; MMI = 0;
356
357  OutStreamer.Finish();
358  return false;
359}
360
361void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
362  // Get the function symbol.
363  CurrentFnSym = GetGlobalValueSymbol(MF.getFunction());
364  IncrementFunctionNumber();
365
366  if (VerboseAsm)
367    LI = &getAnalysis<MachineLoopInfo>();
368}
369
370namespace {
371  // SectionCPs - Keep track the alignment, constpool entries per Section.
372  struct SectionCPs {
373    const MCSection *S;
374    unsigned Alignment;
375    SmallVector<unsigned, 4> CPEs;
376    SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
377  };
378}
379
380/// EmitConstantPool - Print to the current output stream assembly
381/// representations of the constants in the constant pool MCP. This is
382/// used to print out constants which have been "spilled to memory" by
383/// the code generator.
384///
385void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
386  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
387  if (CP.empty()) return;
388
389  // Calculate sections for constant pool entries. We collect entries to go into
390  // the same section together to reduce amount of section switch statements.
391  SmallVector<SectionCPs, 4> CPSections;
392  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
393    const MachineConstantPoolEntry &CPE = CP[i];
394    unsigned Align = CPE.getAlignment();
395
396    SectionKind Kind;
397    switch (CPE.getRelocationInfo()) {
398    default: llvm_unreachable("Unknown section kind");
399    case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
400    case 1:
401      Kind = SectionKind::getReadOnlyWithRelLocal();
402      break;
403    case 0:
404    switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
405    case 4:  Kind = SectionKind::getMergeableConst4(); break;
406    case 8:  Kind = SectionKind::getMergeableConst8(); break;
407    case 16: Kind = SectionKind::getMergeableConst16();break;
408    default: Kind = SectionKind::getMergeableConst(); break;
409    }
410    }
411
412    const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
413
414    // The number of sections are small, just do a linear search from the
415    // last section to the first.
416    bool Found = false;
417    unsigned SecIdx = CPSections.size();
418    while (SecIdx != 0) {
419      if (CPSections[--SecIdx].S == S) {
420        Found = true;
421        break;
422      }
423    }
424    if (!Found) {
425      SecIdx = CPSections.size();
426      CPSections.push_back(SectionCPs(S, Align));
427    }
428
429    if (Align > CPSections[SecIdx].Alignment)
430      CPSections[SecIdx].Alignment = Align;
431    CPSections[SecIdx].CPEs.push_back(i);
432  }
433
434  // Now print stuff into the calculated sections.
435  for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
436    OutStreamer.SwitchSection(CPSections[i].S);
437    EmitAlignment(Log2_32(CPSections[i].Alignment));
438
439    unsigned Offset = 0;
440    for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
441      unsigned CPI = CPSections[i].CPEs[j];
442      MachineConstantPoolEntry CPE = CP[CPI];
443
444      // Emit inter-object padding for alignment.
445      unsigned AlignMask = CPE.getAlignment() - 1;
446      unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
447      OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/);
448
449      const Type *Ty = CPE.getType();
450      Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
451
452      O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
453        << CPI << ':';
454      if (VerboseAsm) {
455        O.PadToColumn(MAI->getCommentColumn());
456        O << MAI->getCommentString() << " constant ";
457        WriteTypeSymbolic(O, CPE.getType(), MF->getFunction()->getParent());
458      }
459      O << '\n';
460      if (CPE.isMachineConstantPoolEntry())
461        EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
462      else
463        EmitGlobalConstant(CPE.Val.ConstVal);
464    }
465  }
466}
467
468/// EmitJumpTableInfo - Print assembly representations of the jump tables used
469/// by the current function to the current output stream.
470///
471void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
472                                   MachineFunction &MF) {
473  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
474  if (JT.empty()) return;
475
476  bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
477
478  // Pick the directive to use to print the jump table entries, and switch to
479  // the appropriate section.
480  TargetLowering *LoweringInfo = TM.getTargetLowering();
481
482  const Function *F = MF.getFunction();
483  bool JTInDiffSection = false;
484  if (F->isWeakForLinker() ||
485      (IsPic && !LoweringInfo->usesGlobalOffsetTable())) {
486    // In PIC mode, we need to emit the jump table to the same section as the
487    // function body itself, otherwise the label differences won't make sense.
488    // We should also do if the section name is NULL or function is declared in
489    // discardable section.
490    OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang,
491                                                                    TM));
492  } else {
493    // Otherwise, drop it in the readonly section.
494    const MCSection *ReadOnlySection =
495      getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
496    OutStreamer.SwitchSection(ReadOnlySection);
497    JTInDiffSection = true;
498  }
499
500  EmitAlignment(Log2_32(MJTI->getAlignment()));
501
502  for (unsigned i = 0, e = JT.size(); i != e; ++i) {
503    const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
504
505    // If this jump table was deleted, ignore it.
506    if (JTBBs.empty()) continue;
507
508    // For PIC codegen, if possible we want to use the SetDirective to reduce
509    // the number of relocations the assembler will generate for the jump table.
510    // Set directives are all printed before the jump table itself.
511    SmallPtrSet<MachineBasicBlock*, 16> EmittedSets;
512    if (MAI->getSetDirective() && IsPic)
513      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
514        if (EmittedSets.insert(JTBBs[ii]))
515          printPICJumpTableSetLabel(i, JTBBs[ii]);
516
517    // On some targets (e.g. Darwin) we want to emit two consequtive labels
518    // before each jump table.  The first label is never referenced, but tells
519    // the assembler and linker the extents of the jump table object.  The
520    // second label is actually referenced by the code.
521    if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0]) {
522      O << MAI->getLinkerPrivateGlobalPrefix()
523        << "JTI" << getFunctionNumber() << '_' << i << ":\n";
524    }
525
526    O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
527      << '_' << i << ":\n";
528
529    for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
530      printPICJumpTableEntry(MJTI, JTBBs[ii], i);
531      O << '\n';
532    }
533  }
534}
535
536void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
537                                        const MachineBasicBlock *MBB,
538                                        unsigned uid)  const {
539  bool isPIC = TM.getRelocationModel() == Reloc::PIC_;
540
541  // Use JumpTableDirective otherwise honor the entry size from the jump table
542  // info.
543  const char *JTEntryDirective = MAI->getJumpTableDirective(isPIC);
544  bool HadJTEntryDirective = JTEntryDirective != NULL;
545  if (!HadJTEntryDirective) {
546    JTEntryDirective = MJTI->getEntrySize() == 4 ?
547      MAI->getData32bitsDirective() : MAI->getData64bitsDirective();
548  }
549
550  O << JTEntryDirective << ' ';
551
552  // If we have emitted set directives for the jump table entries, print
553  // them rather than the entries themselves.  If we're emitting PIC, then
554  // emit the table entries as differences between two text section labels.
555  // If we're emitting non-PIC code, then emit the entries as direct
556  // references to the target basic blocks.
557  if (!isPIC) {
558    O << *GetMBBSymbol(MBB->getNumber());
559  } else if (MAI->getSetDirective()) {
560    O << MAI->getPrivateGlobalPrefix() << getFunctionNumber()
561      << '_' << uid << "_set_" << MBB->getNumber();
562  } else {
563    O << *GetMBBSymbol(MBB->getNumber());
564    // If the arch uses custom Jump Table directives, don't calc relative to
565    // JT
566    if (!HadJTEntryDirective)
567      O << '-' << MAI->getPrivateGlobalPrefix() << "JTI"
568        << getFunctionNumber() << '_' << uid;
569  }
570}
571
572
573/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
574/// special global used by LLVM.  If so, emit it and return true, otherwise
575/// do nothing and return false.
576bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
577  if (GV->getName() == "llvm.used") {
578    if (MAI->getUsedDirective() != 0)    // No need to emit this at all.
579      EmitLLVMUsedList(GV->getInitializer());
580    return true;
581  }
582
583  // Ignore debug and non-emitted data.  This handles llvm.compiler.used.
584  if (GV->getSection() == "llvm.metadata" ||
585      GV->hasAvailableExternallyLinkage())
586    return true;
587
588  if (!GV->hasAppendingLinkage()) return false;
589
590  assert(GV->hasInitializer() && "Not a special LLVM global!");
591
592  const TargetData *TD = TM.getTargetData();
593  unsigned Align = Log2_32(TD->getPointerPrefAlignment());
594  if (GV->getName() == "llvm.global_ctors") {
595    OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
596    EmitAlignment(Align, 0);
597    EmitXXStructorList(GV->getInitializer());
598
599    if (TM.getRelocationModel() == Reloc::Static &&
600        MAI->hasStaticCtorDtorReferenceInStaticMode())
601      O << ".reference .constructors_used\n";
602    return true;
603  }
604
605  if (GV->getName() == "llvm.global_dtors") {
606    OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
607    EmitAlignment(Align, 0);
608    EmitXXStructorList(GV->getInitializer());
609
610    if (TM.getRelocationModel() == Reloc::Static &&
611        MAI->hasStaticCtorDtorReferenceInStaticMode())
612      O << ".reference .destructors_used\n";
613    return true;
614  }
615
616  return false;
617}
618
619/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
620/// global in the specified llvm.used list for which emitUsedDirectiveFor
621/// is true, as being used with this directive.
622void AsmPrinter::EmitLLVMUsedList(Constant *List) {
623  const char *Directive = MAI->getUsedDirective();
624
625  // Should be an array of 'i8*'.
626  ConstantArray *InitList = dyn_cast<ConstantArray>(List);
627  if (InitList == 0) return;
628
629  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
630    const GlobalValue *GV =
631      dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
632    if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang)) {
633      O << Directive;
634      EmitConstantValueOnly(InitList->getOperand(i));
635      O << '\n';
636    }
637  }
638}
639
640/// EmitXXStructorList - Emit the ctor or dtor list.  This just prints out the
641/// function pointers, ignoring the init priority.
642void AsmPrinter::EmitXXStructorList(Constant *List) {
643  // Should be an array of '{ int, void ()* }' structs.  The first value is the
644  // init priority, which we ignore.
645  if (!isa<ConstantArray>(List)) return;
646  ConstantArray *InitList = cast<ConstantArray>(List);
647  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
648    if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
649      if (CS->getNumOperands() != 2) return;  // Not array of 2-element structs.
650
651      if (CS->getOperand(1)->isNullValue())
652        return;  // Found a null terminator, exit printing.
653      // Emit the function pointer.
654      EmitGlobalConstant(CS->getOperand(1));
655    }
656}
657
658
659//===----------------------------------------------------------------------===//
660/// LEB 128 number encoding.
661
662/// PrintULEB128 - Print a series of hexadecimal values (separated by commas)
663/// representing an unsigned leb128 value.
664void AsmPrinter::PrintULEB128(unsigned Value) const {
665  do {
666    unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
667    Value >>= 7;
668    if (Value) Byte |= 0x80;
669    O << "0x";
670    O.write_hex(Byte);
671    if (Value) O << ", ";
672  } while (Value);
673}
674
675/// PrintSLEB128 - Print a series of hexadecimal values (separated by commas)
676/// representing a signed leb128 value.
677void AsmPrinter::PrintSLEB128(int Value) const {
678  int Sign = Value >> (8 * sizeof(Value) - 1);
679  bool IsMore;
680
681  do {
682    unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
683    Value >>= 7;
684    IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
685    if (IsMore) Byte |= 0x80;
686    O << "0x";
687    O.write_hex(Byte);
688    if (IsMore) O << ", ";
689  } while (IsMore);
690}
691
692//===--------------------------------------------------------------------===//
693// Emission and print routines
694//
695
696/// EOL - Print a newline character to asm stream.  If a comment is present
697/// then it will be printed first.  Comments should not contain '\n'.
698void AsmPrinter::EOL() const {
699  O << '\n';
700}
701
702void AsmPrinter::EOL(const Twine &Comment) const {
703  if (VerboseAsm && !Comment.isTriviallyEmpty()) {
704    O.PadToColumn(MAI->getCommentColumn());
705    O << MAI->getCommentString() << ' ' << Comment;
706  }
707  O << '\n';
708}
709
710static const char *DecodeDWARFEncoding(unsigned Encoding) {
711  switch (Encoding) {
712  case dwarf::DW_EH_PE_absptr:
713    return "absptr";
714  case dwarf::DW_EH_PE_omit:
715    return "omit";
716  case dwarf::DW_EH_PE_pcrel:
717    return "pcrel";
718  case dwarf::DW_EH_PE_udata4:
719    return "udata4";
720  case dwarf::DW_EH_PE_udata8:
721    return "udata8";
722  case dwarf::DW_EH_PE_sdata4:
723    return "sdata4";
724  case dwarf::DW_EH_PE_sdata8:
725    return "sdata8";
726  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4:
727    return "pcrel udata4";
728  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4:
729    return "pcrel sdata4";
730  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8:
731    return "pcrel udata8";
732  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8:
733    return "pcrel sdata8";
734  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata4:
735    return "indirect pcrel udata4";
736  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata4:
737    return "indirect pcrel sdata4";
738  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata8:
739    return "indirect pcrel udata8";
740  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata8:
741    return "indirect pcrel sdata8";
742  }
743
744  return 0;
745}
746
747void AsmPrinter::EOL(const Twine &Comment, unsigned Encoding) const {
748  if (VerboseAsm && !Comment.isTriviallyEmpty()) {
749    O.PadToColumn(MAI->getCommentColumn());
750    O << MAI->getCommentString()
751      << ' '
752      << Comment;
753
754    if (const char *EncStr = DecodeDWARFEncoding(Encoding))
755      O << " (" << EncStr << ')';
756  }
757  O << '\n';
758}
759
760/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
761/// unsigned leb128 value.
762void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
763  if (MAI->hasLEB128()) {
764    O << "\t.uleb128\t"
765      << Value;
766  } else {
767    O << MAI->getData8bitsDirective();
768    PrintULEB128(Value);
769  }
770}
771
772/// EmitSLEB128Bytes - print an assembler byte data directive to compose a
773/// signed leb128 value.
774void AsmPrinter::EmitSLEB128Bytes(int Value) const {
775  if (MAI->hasLEB128()) {
776    O << "\t.sleb128\t"
777      << Value;
778  } else {
779    O << MAI->getData8bitsDirective();
780    PrintSLEB128(Value);
781  }
782}
783
784/// EmitInt8 - Emit a byte directive and value.
785///
786void AsmPrinter::EmitInt8(int Value) const {
787  OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/);
788}
789
790/// EmitInt16 - Emit a short directive and value.
791///
792void AsmPrinter::EmitInt16(int Value) const {
793  OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/);
794}
795
796/// EmitInt32 - Emit a long directive and value.
797///
798void AsmPrinter::EmitInt32(int Value) const {
799  OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/);
800}
801
802/// EmitInt64 - Emit a long long directive and value.
803///
804void AsmPrinter::EmitInt64(uint64_t Value) const {
805  OutStreamer.EmitIntValue(Value, 8, 0/*addrspace*/);
806}
807
808/// toOctal - Convert the low order bits of X into an octal digit.
809///
810static inline char toOctal(int X) {
811  return (X&7)+'0';
812}
813
814/// printStringChar - Print a char, escaped if necessary.
815///
816static void printStringChar(formatted_raw_ostream &O, unsigned char C) {
817  if (C == '"') {
818    O << "\\\"";
819  } else if (C == '\\') {
820    O << "\\\\";
821  } else if (isprint((unsigned char)C)) {
822    O << C;
823  } else {
824    switch(C) {
825    case '\b': O << "\\b"; break;
826    case '\f': O << "\\f"; break;
827    case '\n': O << "\\n"; break;
828    case '\r': O << "\\r"; break;
829    case '\t': O << "\\t"; break;
830    default:
831      O << '\\';
832      O << toOctal(C >> 6);
833      O << toOctal(C >> 3);
834      O << toOctal(C >> 0);
835      break;
836    }
837  }
838}
839
840/// EmitString - Emit a string with quotes and a null terminator.
841/// Special characters are emitted properly.
842/// \literal (Eg. '\t') \endliteral
843void AsmPrinter::EmitString(const StringRef String) const {
844  EmitString(String.data(), String.size());
845}
846
847void AsmPrinter::EmitString(const char *String, unsigned Size) const {
848  const char* AscizDirective = MAI->getAscizDirective();
849  if (AscizDirective)
850    O << AscizDirective;
851  else
852    O << MAI->getAsciiDirective();
853  O << '\"';
854  for (unsigned i = 0; i < Size; ++i)
855    printStringChar(O, String[i]);
856  if (AscizDirective)
857    O << '\"';
858  else
859    O << "\\0\"";
860}
861
862
863/// EmitFile - Emit a .file directive.
864void AsmPrinter::EmitFile(unsigned Number, StringRef Name) const {
865  O << "\t.file\t" << Number << " \"";
866  for (unsigned i = 0, N = Name.size(); i < N; ++i)
867    printStringChar(O, Name[i]);
868  O << '\"';
869}
870
871
872//===----------------------------------------------------------------------===//
873
874// EmitAlignment - Emit an alignment directive to the specified power of
875// two boundary.  For example, if you pass in 3 here, you will get an 8
876// byte alignment.  If a global value is specified, and if that global has
877// an explicit alignment requested, it will unconditionally override the
878// alignment request.  However, if ForcedAlignBits is specified, this value
879// has final say: the ultimate alignment will be the max of ForcedAlignBits
880// and the alignment computed with NumBits and the global.
881//
882// The algorithm is:
883//     Align = NumBits;
884//     if (GV && GV->hasalignment) Align = GV->getalignment();
885//     Align = std::max(Align, ForcedAlignBits);
886//
887void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
888                               unsigned ForcedAlignBits,
889                               bool UseFillExpr) const {
890  if (GV && GV->getAlignment())
891    NumBits = Log2_32(GV->getAlignment());
892  NumBits = std::max(NumBits, ForcedAlignBits);
893
894  if (NumBits == 0) return;   // No need to emit alignment.
895
896  unsigned FillValue = 0;
897  if (getCurrentSection()->getKind().isText())
898    FillValue = MAI->getTextAlignFillValue();
899
900  OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0);
901}
902
903// Print out the specified constant, without a storage class.  Only the
904// constants valid in constant expressions can occur here.
905void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
906  if (CV->isNullValue() || isa<UndefValue>(CV)) {
907    O << '0';
908    return;
909  }
910
911  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
912    O << CI->getZExtValue();
913    return;
914  }
915
916  if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
917    // This is a constant address for a global variable or function. Use the
918    // name of the variable or function as the address value.
919    O << *GetGlobalValueSymbol(GV);
920    return;
921  }
922
923  if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV)) {
924    O << *GetBlockAddressSymbol(BA);
925    return;
926  }
927
928  const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
929  if (CE == 0) {
930    llvm_unreachable("Unknown constant value!");
931    O << '0';
932    return;
933  }
934
935  switch (CE->getOpcode()) {
936  case Instruction::ZExt:
937  case Instruction::SExt:
938  case Instruction::FPTrunc:
939  case Instruction::FPExt:
940  case Instruction::UIToFP:
941  case Instruction::SIToFP:
942  case Instruction::FPToUI:
943  case Instruction::FPToSI:
944  default:
945    llvm_unreachable("FIXME: Don't support this constant cast expr");
946  case Instruction::GetElementPtr: {
947    // generate a symbolic expression for the byte address
948    const TargetData *TD = TM.getTargetData();
949    const Constant *ptrVal = CE->getOperand(0);
950    SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
951    int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
952                                          idxVec.size());
953    if (Offset == 0)
954      return EmitConstantValueOnly(ptrVal);
955
956    // Truncate/sext the offset to the pointer size.
957    if (TD->getPointerSizeInBits() != 64) {
958      int SExtAmount = 64-TD->getPointerSizeInBits();
959      Offset = (Offset << SExtAmount) >> SExtAmount;
960    }
961
962    if (Offset)
963      O << '(';
964    EmitConstantValueOnly(ptrVal);
965    if (Offset > 0)
966      O << ") + " << Offset;
967    else
968      O << ") - " << -Offset;
969    return;
970  }
971  case Instruction::BitCast:
972    return EmitConstantValueOnly(CE->getOperand(0));
973
974  case Instruction::IntToPtr: {
975    // Handle casts to pointers by changing them into casts to the appropriate
976    // integer type.  This promotes constant folding and simplifies this code.
977    const TargetData *TD = TM.getTargetData();
978    Constant *Op = CE->getOperand(0);
979    Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(CV->getContext()),
980                                      false/*ZExt*/);
981    return EmitConstantValueOnly(Op);
982  }
983
984  case Instruction::PtrToInt: {
985    // Support only foldable casts to/from pointers that can be eliminated by
986    // changing the pointer to the appropriately sized integer type.
987    Constant *Op = CE->getOperand(0);
988    const Type *Ty = CE->getType();
989    const TargetData *TD = TM.getTargetData();
990
991    // We can emit the pointer value into this slot if the slot is an
992    // integer slot greater or equal to the size of the pointer.
993    if (TD->getTypeAllocSize(Ty) == TD->getTypeAllocSize(Op->getType()))
994      return EmitConstantValueOnly(Op);
995
996    O << "((";
997    EmitConstantValueOnly(Op);
998    APInt ptrMask =
999      APInt::getAllOnesValue(TD->getTypeAllocSizeInBits(Op->getType()));
1000
1001    SmallString<40> S;
1002    ptrMask.toStringUnsigned(S);
1003    O << ") & " << S.str() << ')';
1004    return;
1005  }
1006
1007  case Instruction::Trunc:
1008    // We emit the value and depend on the assembler to truncate the generated
1009    // expression properly.  This is important for differences between
1010    // blockaddress labels.  Since the two labels are in the same function, it
1011    // is reasonable to treat their delta as a 32-bit value.
1012    return EmitConstantValueOnly(CE->getOperand(0));
1013
1014  case Instruction::Add:
1015  case Instruction::Sub:
1016  case Instruction::And:
1017  case Instruction::Or:
1018  case Instruction::Xor:
1019    O << '(';
1020    EmitConstantValueOnly(CE->getOperand(0));
1021    O << ')';
1022    switch (CE->getOpcode()) {
1023    case Instruction::Add:
1024     O << " + ";
1025     break;
1026    case Instruction::Sub:
1027     O << " - ";
1028     break;
1029    case Instruction::And:
1030     O << " & ";
1031     break;
1032    case Instruction::Or:
1033     O << " | ";
1034     break;
1035    case Instruction::Xor:
1036     O << " ^ ";
1037     break;
1038    default:
1039     break;
1040    }
1041    O << '(';
1042    EmitConstantValueOnly(CE->getOperand(1));
1043    O << ')';
1044    break;
1045  }
1046}
1047
1048/// printAsCString - Print the specified array as a C compatible string, only if
1049/// the predicate isString is true.
1050///
1051static void printAsCString(formatted_raw_ostream &O, const ConstantArray *CVA,
1052                           unsigned LastElt) {
1053  assert(CVA->isString() && "Array is not string compatible!");
1054
1055  O << '\"';
1056  for (unsigned i = 0; i != LastElt; ++i) {
1057    unsigned char C =
1058        (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
1059    printStringChar(O, C);
1060  }
1061  O << '\"';
1062}
1063
1064/// EmitString - Emit a zero-byte-terminated string constant.
1065///
1066void AsmPrinter::EmitString(const ConstantArray *CVA) const {
1067  unsigned NumElts = CVA->getNumOperands();
1068  if (MAI->getAscizDirective() && NumElts &&
1069      cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
1070    O << MAI->getAscizDirective();
1071    printAsCString(O, CVA, NumElts-1);
1072  } else {
1073    O << MAI->getAsciiDirective();
1074    printAsCString(O, CVA, NumElts);
1075  }
1076  O << '\n';
1077}
1078
1079static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace,
1080                                    AsmPrinter &AP) {
1081  if (AddrSpace == 0 && CA->isString()) {
1082    AP.EmitString(CA);
1083  } else { // Not a string.  Print the values in successive locations
1084    for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
1085      AP.EmitGlobalConstant(CA->getOperand(i), AddrSpace);
1086  }
1087}
1088
1089static void EmitGlobalConstantVector(const ConstantVector *CV,
1090                                     unsigned AddrSpace, AsmPrinter &AP) {
1091  for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
1092    AP.EmitGlobalConstant(CV->getOperand(i), AddrSpace);
1093}
1094
1095static void EmitGlobalConstantStruct(const ConstantStruct *CS,
1096                                     unsigned AddrSpace, AsmPrinter &AP) {
1097  // Print the fields in successive locations. Pad to align if needed!
1098  const TargetData *TD = AP.TM.getTargetData();
1099  unsigned Size = TD->getTypeAllocSize(CS->getType());
1100  const StructLayout *Layout = TD->getStructLayout(CS->getType());
1101  uint64_t SizeSoFar = 0;
1102  for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
1103    const Constant *Field = CS->getOperand(i);
1104
1105    // Check if padding is needed and insert one or more 0s.
1106    uint64_t FieldSize = TD->getTypeAllocSize(Field->getType());
1107    uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
1108                        - Layout->getElementOffset(i)) - FieldSize;
1109    SizeSoFar += FieldSize + PadSize;
1110
1111    // Now print the actual field value.
1112    AP.EmitGlobalConstant(Field, AddrSpace);
1113
1114    // Insert padding - this may include padding to increase the size of the
1115    // current field up to the ABI size (if the struct is not packed) as well
1116    // as padding to ensure that the next field starts at the right offset.
1117    AP.OutStreamer.EmitZeros(PadSize, AddrSpace);
1118  }
1119  assert(SizeSoFar == Layout->getSizeInBytes() &&
1120         "Layout of constant struct may be incorrect!");
1121}
1122
1123static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace,
1124                                 AsmPrinter &AP) {
1125  // FP Constants are printed as integer constants to avoid losing
1126  // precision.
1127  if (CFP->getType()->isDoubleTy()) {
1128    if (AP.VerboseAsm) {
1129      double Val = CFP->getValueAPF().convertToDouble();
1130      AP.OutStreamer.GetCommentOS() << "double " << Val << '\n';
1131    }
1132
1133    uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1134    AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1135    return;
1136  }
1137
1138  if (CFP->getType()->isFloatTy()) {
1139    if (AP.VerboseAsm) {
1140      float Val = CFP->getValueAPF().convertToFloat();
1141      AP.OutStreamer.GetCommentOS() << "float " << Val << '\n';
1142    }
1143    uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1144    AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace);
1145    return;
1146  }
1147
1148  if (CFP->getType()->isX86_FP80Ty()) {
1149    // all long double variants are printed as hex
1150    // api needed to prevent premature destruction
1151    APInt API = CFP->getValueAPF().bitcastToAPInt();
1152    const uint64_t *p = API.getRawData();
1153    if (AP.VerboseAsm) {
1154      // Convert to double so we can print the approximate val as a comment.
1155      APFloat DoubleVal = CFP->getValueAPF();
1156      bool ignored;
1157      DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1158                        &ignored);
1159      AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= "
1160        << DoubleVal.convertToDouble() << '\n';
1161    }
1162
1163    if (AP.TM.getTargetData()->isBigEndian()) {
1164      AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1165      AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1166    } else {
1167      AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1168      AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1169    }
1170
1171    // Emit the tail padding for the long double.
1172    const TargetData &TD = *AP.TM.getTargetData();
1173    AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) -
1174                             TD.getTypeStoreSize(CFP->getType()), AddrSpace);
1175    return;
1176  }
1177
1178  assert(CFP->getType()->isPPC_FP128Ty() &&
1179         "Floating point constant type not handled");
1180  // All long double variants are printed as hex api needed to prevent
1181  // premature destruction.
1182  APInt API = CFP->getValueAPF().bitcastToAPInt();
1183  const uint64_t *p = API.getRawData();
1184  if (AP.TM.getTargetData()->isBigEndian()) {
1185    AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1186    AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1187  } else {
1188    AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1189    AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1190  }
1191}
1192
1193static void EmitGlobalConstantLargeInt(const ConstantInt *CI,
1194                                       unsigned AddrSpace, AsmPrinter &AP) {
1195  const TargetData *TD = AP.TM.getTargetData();
1196  unsigned BitWidth = CI->getBitWidth();
1197  assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
1198
1199  // We don't expect assemblers to support integer data directives
1200  // for more than 64 bits, so we emit the data in at most 64-bit
1201  // quantities at a time.
1202  const uint64_t *RawData = CI->getValue().getRawData();
1203  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1204    uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i];
1205    AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1206  }
1207}
1208
1209/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1210void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1211  if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) {
1212    uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1213    return OutStreamer.EmitZeros(Size, AddrSpace);
1214  }
1215
1216  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1217    unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1218    switch (Size) {
1219    case 1:
1220    case 2:
1221    case 4:
1222    case 8:
1223      if (VerboseAsm)
1224        OutStreamer.GetCommentOS() << format("0x%llx\n", CI->getZExtValue());
1225      OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace);
1226      return;
1227    default:
1228      EmitGlobalConstantLargeInt(CI, AddrSpace, *this);
1229      return;
1230    }
1231  }
1232
1233  if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
1234    return EmitGlobalConstantArray(CVA, AddrSpace, *this);
1235
1236  if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
1237    return EmitGlobalConstantStruct(CVS, AddrSpace, *this);
1238
1239  if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
1240    return EmitGlobalConstantFP(CFP, AddrSpace, *this);
1241
1242  if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
1243    return EmitGlobalConstantVector(V, AddrSpace, *this);
1244
1245  if (isa<ConstantPointerNull>(CV)) {
1246    unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1247    OutStreamer.EmitIntValue(0, Size, AddrSpace);
1248    return;
1249  }
1250
1251  // Otherwise, it must be a ConstantExpr.  Emit the data directive, then emit
1252  // the expression value.
1253  switch (TM.getTargetData()->getTypeAllocSize(CV->getType())) {
1254  case 0: return;
1255  case 1: O << MAI->getData8bitsDirective(AddrSpace); break;
1256  case 2: O << MAI->getData16bitsDirective(AddrSpace); break;
1257  case 4: O << MAI->getData32bitsDirective(AddrSpace); break;
1258  case 8:
1259    if (const char *Dir = MAI->getData64bitsDirective(AddrSpace)) {
1260      O << Dir;
1261      break;
1262    }
1263    // FALL THROUGH.
1264  default:
1265    llvm_unreachable("Target cannot handle given data directive width!");
1266    return;
1267  }
1268
1269  EmitConstantValueOnly(CV);
1270  O << '\n';
1271}
1272
1273void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1274  // Target doesn't support this yet!
1275  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1276}
1277
1278/// PrintSpecial - Print information related to the specified machine instr
1279/// that is independent of the operand, and may be independent of the instr
1280/// itself.  This can be useful for portably encoding the comment character
1281/// or other bits of target-specific knowledge into the asmstrings.  The
1282/// syntax used is ${:comment}.  Targets can override this to add support
1283/// for their own strange codes.
1284void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1285  if (!strcmp(Code, "private")) {
1286    O << MAI->getPrivateGlobalPrefix();
1287  } else if (!strcmp(Code, "comment")) {
1288    if (VerboseAsm)
1289      O << MAI->getCommentString();
1290  } else if (!strcmp(Code, "uid")) {
1291    // Comparing the address of MI isn't sufficient, because machineinstrs may
1292    // be allocated to the same address across functions.
1293    const Function *ThisF = MI->getParent()->getParent()->getFunction();
1294
1295    // If this is a new LastFn instruction, bump the counter.
1296    if (LastMI != MI || LastFn != ThisF) {
1297      ++Counter;
1298      LastMI = MI;
1299      LastFn = ThisF;
1300    }
1301    O << Counter;
1302  } else {
1303    std::string msg;
1304    raw_string_ostream Msg(msg);
1305    Msg << "Unknown special formatter '" << Code
1306         << "' for machine instr: " << *MI;
1307    llvm_report_error(Msg.str());
1308  }
1309}
1310
1311/// processDebugLoc - Processes the debug information of each machine
1312/// instruction's DebugLoc.
1313void AsmPrinter::processDebugLoc(const MachineInstr *MI,
1314                                 bool BeforePrintingInsn) {
1315  if (!MAI || !DW || !MAI->doesSupportDebugInformation()
1316      || !DW->ShouldEmitDwarfDebug())
1317    return;
1318  DebugLoc DL = MI->getDebugLoc();
1319  if (DL.isUnknown())
1320    return;
1321  DILocation CurDLT = MF->getDILocation(DL);
1322  if (CurDLT.getScope().isNull())
1323    return;
1324
1325  if (!BeforePrintingInsn) {
1326    // After printing instruction
1327    DW->EndScope(MI);
1328  } else if (CurDLT.getNode() != PrevDLT) {
1329    unsigned L = DW->RecordSourceLine(CurDLT.getLineNumber(),
1330                                      CurDLT.getColumnNumber(),
1331                                      CurDLT.getScope().getNode());
1332    printLabel(L);
1333    O << '\n';
1334    DW->BeginScope(MI, L);
1335    PrevDLT = CurDLT.getNode();
1336  }
1337}
1338
1339
1340/// printInlineAsm - This method formats and prints the specified machine
1341/// instruction that is an inline asm.
1342void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1343  unsigned NumOperands = MI->getNumOperands();
1344
1345  // Count the number of register definitions.
1346  unsigned NumDefs = 0;
1347  for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1348       ++NumDefs)
1349    assert(NumDefs != NumOperands-1 && "No asm string?");
1350
1351  assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1352
1353  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1354  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1355
1356  O << '\t';
1357
1358  // If this asmstr is empty, just print the #APP/#NOAPP markers.
1359  // These are useful to see where empty asm's wound up.
1360  if (AsmStr[0] == 0) {
1361    O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1362    O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
1363    return;
1364  }
1365
1366  O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1367
1368  // The variant of the current asmprinter.
1369  int AsmPrinterVariant = MAI->getAssemblerDialect();
1370
1371  int CurVariant = -1;            // The number of the {.|.|.} region we are in.
1372  const char *LastEmitted = AsmStr; // One past the last character emitted.
1373
1374  while (*LastEmitted) {
1375    switch (*LastEmitted) {
1376    default: {
1377      // Not a special case, emit the string section literally.
1378      const char *LiteralEnd = LastEmitted+1;
1379      while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1380             *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1381        ++LiteralEnd;
1382      if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1383        O.write(LastEmitted, LiteralEnd-LastEmitted);
1384      LastEmitted = LiteralEnd;
1385      break;
1386    }
1387    case '\n':
1388      ++LastEmitted;   // Consume newline character.
1389      O << '\n';       // Indent code with newline.
1390      break;
1391    case '$': {
1392      ++LastEmitted;   // Consume '$' character.
1393      bool Done = true;
1394
1395      // Handle escapes.
1396      switch (*LastEmitted) {
1397      default: Done = false; break;
1398      case '$':     // $$ -> $
1399        if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1400          O << '$';
1401        ++LastEmitted;  // Consume second '$' character.
1402        break;
1403      case '(':             // $( -> same as GCC's { character.
1404        ++LastEmitted;      // Consume '(' character.
1405        if (CurVariant != -1) {
1406          llvm_report_error("Nested variants found in inline asm string: '"
1407                            + std::string(AsmStr) + "'");
1408        }
1409        CurVariant = 0;     // We're in the first variant now.
1410        break;
1411      case '|':
1412        ++LastEmitted;  // consume '|' character.
1413        if (CurVariant == -1)
1414          O << '|';       // this is gcc's behavior for | outside a variant
1415        else
1416          ++CurVariant;   // We're in the next variant.
1417        break;
1418      case ')':         // $) -> same as GCC's } char.
1419        ++LastEmitted;  // consume ')' character.
1420        if (CurVariant == -1)
1421          O << '}';     // this is gcc's behavior for } outside a variant
1422        else
1423          CurVariant = -1;
1424        break;
1425      }
1426      if (Done) break;
1427
1428      bool HasCurlyBraces = false;
1429      if (*LastEmitted == '{') {     // ${variable}
1430        ++LastEmitted;               // Consume '{' character.
1431        HasCurlyBraces = true;
1432      }
1433
1434      // If we have ${:foo}, then this is not a real operand reference, it is a
1435      // "magic" string reference, just like in .td files.  Arrange to call
1436      // PrintSpecial.
1437      if (HasCurlyBraces && *LastEmitted == ':') {
1438        ++LastEmitted;
1439        const char *StrStart = LastEmitted;
1440        const char *StrEnd = strchr(StrStart, '}');
1441        if (StrEnd == 0) {
1442          llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1443                            + std::string(AsmStr) + "'");
1444        }
1445
1446        std::string Val(StrStart, StrEnd);
1447        PrintSpecial(MI, Val.c_str());
1448        LastEmitted = StrEnd+1;
1449        break;
1450      }
1451
1452      const char *IDStart = LastEmitted;
1453      char *IDEnd;
1454      errno = 0;
1455      long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1456      if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1457        llvm_report_error("Bad $ operand number in inline asm string: '"
1458                          + std::string(AsmStr) + "'");
1459      }
1460      LastEmitted = IDEnd;
1461
1462      char Modifier[2] = { 0, 0 };
1463
1464      if (HasCurlyBraces) {
1465        // If we have curly braces, check for a modifier character.  This
1466        // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1467        if (*LastEmitted == ':') {
1468          ++LastEmitted;    // Consume ':' character.
1469          if (*LastEmitted == 0) {
1470            llvm_report_error("Bad ${:} expression in inline asm string: '"
1471                              + std::string(AsmStr) + "'");
1472          }
1473
1474          Modifier[0] = *LastEmitted;
1475          ++LastEmitted;    // Consume modifier character.
1476        }
1477
1478        if (*LastEmitted != '}') {
1479          llvm_report_error("Bad ${} expression in inline asm string: '"
1480                            + std::string(AsmStr) + "'");
1481        }
1482        ++LastEmitted;    // Consume '}' character.
1483      }
1484
1485      if ((unsigned)Val >= NumOperands-1) {
1486        llvm_report_error("Invalid $ operand number in inline asm string: '"
1487                          + std::string(AsmStr) + "'");
1488      }
1489
1490      // Okay, we finally have a value number.  Ask the target to print this
1491      // operand!
1492      if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1493        unsigned OpNo = 1;
1494
1495        bool Error = false;
1496
1497        // Scan to find the machine operand number for the operand.
1498        for (; Val; --Val) {
1499          if (OpNo >= MI->getNumOperands()) break;
1500          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1501          OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1502        }
1503
1504        if (OpNo >= MI->getNumOperands()) {
1505          Error = true;
1506        } else {
1507          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1508          ++OpNo;  // Skip over the ID number.
1509
1510          if (Modifier[0] == 'l')  // labels are target independent
1511            O << *GetMBBSymbol(MI->getOperand(OpNo).getMBB()->getNumber());
1512          else {
1513            AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1514            if ((OpFlags & 7) == 4) {
1515              Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1516                                                Modifier[0] ? Modifier : 0);
1517            } else {
1518              Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1519                                          Modifier[0] ? Modifier : 0);
1520            }
1521          }
1522        }
1523        if (Error) {
1524          std::string msg;
1525          raw_string_ostream Msg(msg);
1526          Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n";
1527          MI->print(Msg);
1528          llvm_report_error(Msg.str());
1529        }
1530      }
1531      break;
1532    }
1533    }
1534  }
1535  O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd();
1536}
1537
1538/// printImplicitDef - This method prints the specified machine instruction
1539/// that is an implicit def.
1540void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1541  if (!VerboseAsm) return;
1542  O.PadToColumn(MAI->getCommentColumn());
1543  O << MAI->getCommentString() << " implicit-def: "
1544    << TRI->getName(MI->getOperand(0).getReg());
1545}
1546
1547void AsmPrinter::printKill(const MachineInstr *MI) const {
1548  if (!VerboseAsm) return;
1549  O.PadToColumn(MAI->getCommentColumn());
1550  O << MAI->getCommentString() << " kill:";
1551  for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) {
1552    const MachineOperand &op = MI->getOperand(n);
1553    assert(op.isReg() && "KILL instruction must have only register operands");
1554    O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>");
1555  }
1556}
1557
1558/// printLabel - This method prints a local label used by debug and
1559/// exception handling tables.
1560void AsmPrinter::printLabel(const MachineInstr *MI) const {
1561  printLabel(MI->getOperand(0).getImm());
1562}
1563
1564void AsmPrinter::printLabel(unsigned Id) const {
1565  O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':';
1566}
1567
1568/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1569/// instruction, using the specified assembler variant.  Targets should
1570/// override this to format as appropriate.
1571bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1572                                 unsigned AsmVariant, const char *ExtraCode) {
1573  // Target doesn't support this yet!
1574  return true;
1575}
1576
1577bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1578                                       unsigned AsmVariant,
1579                                       const char *ExtraCode) {
1580  // Target doesn't support this yet!
1581  return true;
1582}
1583
1584MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA,
1585                                            const char *Suffix) const {
1586  return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock(), Suffix);
1587}
1588
1589MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F,
1590                                            const BasicBlock *BB,
1591                                            const char *Suffix) const {
1592  assert(BB->hasName() &&
1593         "Address of anonymous basic block not supported yet!");
1594
1595  // This code must use the function name itself, and not the function number,
1596  // since it must be possible to generate the label name from within other
1597  // functions.
1598  SmallString<60> FnName;
1599  Mang->getNameWithPrefix(FnName, F, false);
1600
1601  // FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME!
1602  SmallString<60> NameResult;
1603  Mang->getNameWithPrefix(NameResult,
1604                          StringRef("BA") + Twine((unsigned)FnName.size()) +
1605                          "_" + FnName.str() + "_" + BB->getName() + Suffix,
1606                          Mangler::Private);
1607
1608  return OutContext.GetOrCreateSymbol(NameResult.str());
1609}
1610
1611MCSymbol *AsmPrinter::GetMBBSymbol(unsigned MBBID) const {
1612  SmallString<60> Name;
1613  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "BB"
1614    << getFunctionNumber() << '_' << MBBID;
1615
1616  return OutContext.GetOrCreateSymbol(Name.str());
1617}
1618
1619/// GetGlobalValueSymbol - Return the MCSymbol for the specified global
1620/// value.
1621MCSymbol *AsmPrinter::GetGlobalValueSymbol(const GlobalValue *GV) const {
1622  SmallString<60> NameStr;
1623  Mang->getNameWithPrefix(NameStr, GV, false);
1624  return OutContext.GetOrCreateSymbol(NameStr.str());
1625}
1626
1627/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
1628/// global value name as its base, with the specified suffix, and where the
1629/// symbol is forced to have private linkage if ForcePrivate is true.
1630MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
1631                                                   StringRef Suffix,
1632                                                   bool ForcePrivate) const {
1633  SmallString<60> NameStr;
1634  Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
1635  NameStr.append(Suffix.begin(), Suffix.end());
1636  return OutContext.GetOrCreateSymbol(NameStr.str());
1637}
1638
1639/// GetExternalSymbolSymbol - Return the MCSymbol for the specified
1640/// ExternalSymbol.
1641MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
1642  SmallString<60> NameStr;
1643  Mang->getNameWithPrefix(NameStr, Sym);
1644  return OutContext.GetOrCreateSymbol(NameStr.str());
1645}
1646
1647
1648
1649/// PrintParentLoopComment - Print comments about parent loops of this one.
1650static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1651                                   unsigned FunctionNumber) {
1652  if (Loop == 0) return;
1653  PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
1654  OS.indent(Loop->getLoopDepth()*2)
1655    << "Parent Loop BB" << FunctionNumber << "_"
1656    << Loop->getHeader()->getNumber()
1657    << " Depth=" << Loop->getLoopDepth() << '\n';
1658}
1659
1660
1661/// PrintChildLoopComment - Print comments about child loops within
1662/// the loop for this basic block, with nesting.
1663static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1664                                  unsigned FunctionNumber) {
1665  // Add child loop information
1666  for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
1667    OS.indent((*CL)->getLoopDepth()*2)
1668      << "Child Loop BB" << FunctionNumber << "_"
1669      << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
1670      << '\n';
1671    PrintChildLoopComment(OS, *CL, FunctionNumber);
1672  }
1673}
1674
1675/// EmitComments - Pretty-print comments for basic blocks.
1676static void PrintBasicBlockLoopComments(const MachineBasicBlock &MBB,
1677                                        const MachineLoopInfo *LI,
1678                                        const AsmPrinter &AP) {
1679  // Add loop depth information
1680  const MachineLoop *Loop = LI->getLoopFor(&MBB);
1681  if (Loop == 0) return;
1682
1683  MachineBasicBlock *Header = Loop->getHeader();
1684  assert(Header && "No header for loop");
1685
1686  // If this block is not a loop header, just print out what is the loop header
1687  // and return.
1688  if (Header != &MBB) {
1689    AP.OutStreamer.AddComment("  in Loop: Header=BB" +
1690                              Twine(AP.getFunctionNumber())+"_" +
1691                              Twine(Loop->getHeader()->getNumber())+
1692                              " Depth="+Twine(Loop->getLoopDepth()));
1693    return;
1694  }
1695
1696  // Otherwise, it is a loop header.  Print out information about child and
1697  // parent loops.
1698  raw_ostream &OS = AP.OutStreamer.GetCommentOS();
1699
1700  PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
1701
1702  OS << "=>";
1703  OS.indent(Loop->getLoopDepth()*2-2);
1704
1705  OS << "This ";
1706  if (Loop->empty())
1707    OS << "Inner ";
1708  OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
1709
1710  PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
1711}
1712
1713
1714/// EmitBasicBlockStart - This method prints the label for the specified
1715/// MachineBasicBlock, an alignment (if present) and a comment describing
1716/// it if appropriate.
1717void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
1718  // Emit an alignment directive for this block, if needed.
1719  if (unsigned Align = MBB->getAlignment())
1720    EmitAlignment(Log2_32(Align));
1721
1722  // If the block has its address taken, emit a special label to satisfy
1723  // references to the block. This is done so that we don't need to
1724  // remember the number of this label, and so that we can make
1725  // forward references to labels without knowing what their numbers
1726  // will be.
1727  if (MBB->hasAddressTaken()) {
1728    const BasicBlock *BB = MBB->getBasicBlock();
1729    if (VerboseAsm)
1730      OutStreamer.AddComment("Address Taken");
1731    OutStreamer.EmitLabel(GetBlockAddressSymbol(BB->getParent(), BB));
1732  }
1733
1734  // Print the main label for the block.
1735  if (MBB->pred_empty() || MBB->isOnlyReachableByFallthrough()) {
1736    if (VerboseAsm) {
1737      O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':';
1738      if (const BasicBlock *BB = MBB->getBasicBlock())
1739        if (BB->hasName())
1740          OutStreamer.AddComment("%" + BB->getName());
1741
1742      PrintBasicBlockLoopComments(*MBB, LI, *this);
1743      OutStreamer.AddBlankLine();
1744    }
1745  } else {
1746    if (VerboseAsm) {
1747      if (const BasicBlock *BB = MBB->getBasicBlock())
1748        if (BB->hasName())
1749          OutStreamer.AddComment("%" + BB->getName());
1750      PrintBasicBlockLoopComments(*MBB, LI, *this);
1751    }
1752
1753    OutStreamer.EmitLabel(GetMBBSymbol(MBB->getNumber()));
1754  }
1755}
1756
1757/// printPICJumpTableSetLabel - This method prints a set label for the
1758/// specified MachineBasicBlock for a jumptable entry.
1759void AsmPrinter::printPICJumpTableSetLabel(unsigned uid,
1760                                           const MachineBasicBlock *MBB) const {
1761  if (!MAI->getSetDirective())
1762    return;
1763
1764  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1765    << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ','
1766    << *GetMBBSymbol(MBB->getNumber())
1767    << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1768    << '_' << uid << '\n';
1769}
1770
1771void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
1772                                           const MachineBasicBlock *MBB) const {
1773  if (!MAI->getSetDirective())
1774    return;
1775
1776  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1777    << getFunctionNumber() << '_' << uid << '_' << uid2
1778    << "_set_" << MBB->getNumber() << ','
1779    << *GetMBBSymbol(MBB->getNumber())
1780    << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1781    << '_' << uid << '_' << uid2 << '\n';
1782}
1783
1784void AsmPrinter::printVisibility(const MCSymbol *Sym,
1785                                 unsigned Visibility) const {
1786  if (Visibility == GlobalValue::HiddenVisibility) {
1787    if (const char *Directive = MAI->getHiddenDirective())
1788      O << Directive << *Sym << '\n';
1789  } else if (Visibility == GlobalValue::ProtectedVisibility) {
1790    if (const char *Directive = MAI->getProtectedDirective())
1791      O << Directive << *Sym << '\n';
1792  }
1793}
1794
1795void AsmPrinter::printOffset(int64_t Offset) const {
1796  if (Offset > 0)
1797    O << '+' << Offset;
1798  else if (Offset < 0)
1799    O << Offset;
1800}
1801
1802GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1803  if (!S->usesMetadata())
1804    return 0;
1805
1806  gcp_iterator GCPI = GCMetadataPrinters.find(S);
1807  if (GCPI != GCMetadataPrinters.end())
1808    return GCPI->second;
1809
1810  const char *Name = S->getName().c_str();
1811
1812  for (GCMetadataPrinterRegistry::iterator
1813         I = GCMetadataPrinterRegistry::begin(),
1814         E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1815    if (strcmp(Name, I->getName()) == 0) {
1816      GCMetadataPrinter *GMP = I->instantiate();
1817      GMP->S = S;
1818      GCMetadataPrinters.insert(std::make_pair(S, GMP));
1819      return GMP;
1820    }
1821
1822  errs() << "no GCMetadataPrinter registered for GC: " << Name << "\n";
1823  llvm_unreachable(0);
1824}
1825
1826/// EmitComments - Pretty-print comments for instructions
1827void AsmPrinter::EmitComments(const MachineInstr &MI) const {
1828  if (!VerboseAsm)
1829    return;
1830
1831  bool Newline = false;
1832
1833  if (!MI.getDebugLoc().isUnknown()) {
1834    DILocation DLT = MF->getDILocation(MI.getDebugLoc());
1835
1836    // Print source line info.
1837    O.PadToColumn(MAI->getCommentColumn());
1838    O << MAI->getCommentString() << ' ';
1839    DIScope Scope = DLT.getScope();
1840    // Omit the directory, because it's likely to be long and uninteresting.
1841    if (!Scope.isNull())
1842      O << Scope.getFilename();
1843    else
1844      O << "<unknown>";
1845    O << ':' << DLT.getLineNumber();
1846    if (DLT.getColumnNumber() != 0)
1847      O << ':' << DLT.getColumnNumber();
1848    Newline = true;
1849  }
1850
1851  // Check for spills and reloads
1852  int FI;
1853
1854  const MachineFrameInfo *FrameInfo =
1855    MI.getParent()->getParent()->getFrameInfo();
1856
1857  // We assume a single instruction only has a spill or reload, not
1858  // both.
1859  const MachineMemOperand *MMO;
1860  if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
1861    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1862      MMO = *MI.memoperands_begin();
1863      if (Newline) O << '\n';
1864      O.PadToColumn(MAI->getCommentColumn());
1865      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Reload";
1866      Newline = true;
1867    }
1868  }
1869  else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
1870    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1871      if (Newline) O << '\n';
1872      O.PadToColumn(MAI->getCommentColumn());
1873      O << MAI->getCommentString() << ' '
1874        << MMO->getSize() << "-byte Folded Reload";
1875      Newline = true;
1876    }
1877  }
1878  else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
1879    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1880      MMO = *MI.memoperands_begin();
1881      if (Newline) O << '\n';
1882      O.PadToColumn(MAI->getCommentColumn());
1883      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Spill";
1884      Newline = true;
1885    }
1886  }
1887  else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
1888    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1889      if (Newline) O << '\n';
1890      O.PadToColumn(MAI->getCommentColumn());
1891      O << MAI->getCommentString() << ' '
1892        << MMO->getSize() << "-byte Folded Spill";
1893      Newline = true;
1894    }
1895  }
1896
1897  // Check for spill-induced copies
1898  unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
1899  if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg,
1900                                      SrcSubIdx, DstSubIdx)) {
1901    if (MI.getAsmPrinterFlag(ReloadReuse)) {
1902      if (Newline) O << '\n';
1903      O.PadToColumn(MAI->getCommentColumn());
1904      O << MAI->getCommentString() << " Reload Reuse";
1905    }
1906  }
1907}
1908
1909