AsmPrinter.cpp revision d7b6c9c54d0cd4a1b92679f85f89fdd90782125a 
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 << '\n';
201      return;
202    }
203
204    // .local _foo
205    OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Local);
206    // .comm _foo, 42, 4
207    OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
208    return;
209  }
210
211  const MCSection *TheSection =
212    getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
213
214  // Handle the zerofill directive on darwin, which is a special form of BSS
215  // emission.
216  if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
217    // .globl _foo
218    OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
219    // .zerofill __DATA, __common, _foo, 400, 5
220    OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
221    return;
222  }
223
224  OutStreamer.SwitchSection(TheSection);
225
226  // TODO: Factor into an 'emit linkage' thing that is shared with function
227  // bodies.
228  switch (GV->getLinkage()) {
229  case GlobalValue::CommonLinkage:
230  case GlobalValue::LinkOnceAnyLinkage:
231  case GlobalValue::LinkOnceODRLinkage:
232  case GlobalValue::WeakAnyLinkage:
233  case GlobalValue::WeakODRLinkage:
234  case GlobalValue::LinkerPrivateLinkage:
235    if (MAI->getWeakDefDirective() != 0) {
236      // .globl _foo
237      OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
238      // .weak_definition _foo
239      OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::WeakDefinition);
240    } else if (const char *LinkOnce = MAI->getLinkOnceDirective()) {
241      // .globl _foo
242      OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
243      // .linkonce same_size
244      O << LinkOnce;
245    } else {
246      // .weak _foo
247      OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Weak);
248    }
249    break;
250  case GlobalValue::DLLExportLinkage:
251  case GlobalValue::AppendingLinkage:
252    // FIXME: appending linkage variables should go into a section of
253    // their name or something.  For now, just emit them as external.
254  case GlobalValue::ExternalLinkage:
255    // If external or appending, declare as a global symbol.
256    // .globl _foo
257    OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
258    break;
259  case GlobalValue::PrivateLinkage:
260  case GlobalValue::InternalLinkage:
261     break;
262  default:
263    llvm_unreachable("Unknown linkage type!");
264  }
265
266  EmitAlignment(AlignLog, GV);
267  if (VerboseAsm) {
268    WriteAsOperand(OutStreamer.GetCommentOS(), GV,
269                   /*PrintType=*/false, GV->getParent());
270    OutStreamer.GetCommentOS() << '\n';
271  }
272  OutStreamer.EmitLabel(GVSym);
273
274  EmitGlobalConstant(GV->getInitializer());
275
276  if (MAI->hasDotTypeDotSizeDirective())
277    O << "\t.size\t" << *GVSym << ", " << Size << '\n';
278
279  OutStreamer.AddBlankLine();
280}
281
282
283bool AsmPrinter::doFinalization(Module &M) {
284  // Emit global variables.
285  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
286       I != E; ++I)
287    EmitGlobalVariable(I);
288
289  // Emit final debug information.
290  if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
291    DW->EndModule();
292
293  // If the target wants to know about weak references, print them all.
294  if (MAI->getWeakRefDirective()) {
295    // FIXME: This is not lazy, it would be nice to only print weak references
296    // to stuff that is actually used.  Note that doing so would require targets
297    // to notice uses in operands (due to constant exprs etc).  This should
298    // happen with the MC stuff eventually.
299
300    // Print out module-level global variables here.
301    for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
302         I != E; ++I) {
303      if (!I->hasExternalWeakLinkage()) continue;
304      OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(I),
305                                      MCStreamer::WeakReference);
306    }
307
308    for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
309      if (!I->hasExternalWeakLinkage()) continue;
310      OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(I),
311                                      MCStreamer::WeakReference);
312    }
313  }
314
315  if (MAI->getSetDirective()) {
316    OutStreamer.AddBlankLine();
317    for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
318         I != E; ++I) {
319      MCSymbol *Name = GetGlobalValueSymbol(I);
320
321      const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
322      MCSymbol *Target = GetGlobalValueSymbol(GV);
323
324      if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
325        OutStreamer.EmitSymbolAttribute(Name, MCStreamer::Global);
326      else if (I->hasWeakLinkage())
327        OutStreamer.EmitSymbolAttribute(Name, MCStreamer::WeakReference);
328      else
329        assert(I->hasLocalLinkage() && "Invalid alias linkage");
330
331      printVisibility(Name, I->getVisibility());
332
333      O << MAI->getSetDirective() << ' ' << *Name << ", " << *Target << '\n';
334    }
335  }
336
337  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
338  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
339  for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
340    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
341      MP->finishAssembly(O, *this, *MAI);
342
343  // If we don't have any trampolines, then we don't require stack memory
344  // to be executable. Some targets have a directive to declare this.
345  Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
346  if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
347    // FIXME: This is actually a section switch on linux/x86 and systemz, use
348    // switch section.
349    if (MAI->getNonexecutableStackDirective())
350      O << MAI->getNonexecutableStackDirective() << '\n';
351
352
353  // Allow the target to emit any magic that it wants at the end of the file,
354  // after everything else has gone out.
355  EmitEndOfAsmFile(M);
356
357  delete Mang; Mang = 0;
358  DW = 0; MMI = 0;
359
360  OutStreamer.Finish();
361  return false;
362}
363
364void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
365  // Get the function symbol.
366  CurrentFnSym = GetGlobalValueSymbol(MF.getFunction());
367  IncrementFunctionNumber();
368
369  if (VerboseAsm)
370    LI = &getAnalysis<MachineLoopInfo>();
371}
372
373namespace {
374  // SectionCPs - Keep track the alignment, constpool entries per Section.
375  struct SectionCPs {
376    const MCSection *S;
377    unsigned Alignment;
378    SmallVector<unsigned, 4> CPEs;
379    SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
380  };
381}
382
383/// EmitConstantPool - Print to the current output stream assembly
384/// representations of the constants in the constant pool MCP. This is
385/// used to print out constants which have been "spilled to memory" by
386/// the code generator.
387///
388void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
389  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
390  if (CP.empty()) return;
391
392  // Calculate sections for constant pool entries. We collect entries to go into
393  // the same section together to reduce amount of section switch statements.
394  SmallVector<SectionCPs, 4> CPSections;
395  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
396    const MachineConstantPoolEntry &CPE = CP[i];
397    unsigned Align = CPE.getAlignment();
398
399    SectionKind Kind;
400    switch (CPE.getRelocationInfo()) {
401    default: llvm_unreachable("Unknown section kind");
402    case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
403    case 1:
404      Kind = SectionKind::getReadOnlyWithRelLocal();
405      break;
406    case 0:
407    switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
408    case 4:  Kind = SectionKind::getMergeableConst4(); break;
409    case 8:  Kind = SectionKind::getMergeableConst8(); break;
410    case 16: Kind = SectionKind::getMergeableConst16();break;
411    default: Kind = SectionKind::getMergeableConst(); break;
412    }
413    }
414
415    const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
416
417    // The number of sections are small, just do a linear search from the
418    // last section to the first.
419    bool Found = false;
420    unsigned SecIdx = CPSections.size();
421    while (SecIdx != 0) {
422      if (CPSections[--SecIdx].S == S) {
423        Found = true;
424        break;
425      }
426    }
427    if (!Found) {
428      SecIdx = CPSections.size();
429      CPSections.push_back(SectionCPs(S, Align));
430    }
431
432    if (Align > CPSections[SecIdx].Alignment)
433      CPSections[SecIdx].Alignment = Align;
434    CPSections[SecIdx].CPEs.push_back(i);
435  }
436
437  // Now print stuff into the calculated sections.
438  for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
439    OutStreamer.SwitchSection(CPSections[i].S);
440    EmitAlignment(Log2_32(CPSections[i].Alignment));
441
442    unsigned Offset = 0;
443    for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
444      unsigned CPI = CPSections[i].CPEs[j];
445      MachineConstantPoolEntry CPE = CP[CPI];
446
447      // Emit inter-object padding for alignment.
448      unsigned AlignMask = CPE.getAlignment() - 1;
449      unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
450      OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/);
451
452      const Type *Ty = CPE.getType();
453      Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
454
455      // Emit the label with a comment on it.
456      if (VerboseAsm) {
457        OutStreamer.GetCommentOS() << "constant pool ";
458        WriteTypeSymbolic(OutStreamer.GetCommentOS(), CPE.getType(),
459                          MF->getFunction()->getParent());
460        OutStreamer.GetCommentOS() << '\n';
461      }
462      OutStreamer.EmitLabel(GetCPISymbol(CPI));
463
464      if (CPE.isMachineConstantPoolEntry())
465        EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
466      else
467        EmitGlobalConstant(CPE.Val.ConstVal);
468    }
469  }
470}
471
472/// EmitJumpTableInfo - Print assembly representations of the jump tables used
473/// by the current function to the current output stream.
474///
475void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
476                                   MachineFunction &MF) {
477  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
478  if (JT.empty()) return;
479
480  bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
481
482  // Pick the directive to use to print the jump table entries, and switch to
483  // the appropriate section.
484  TargetLowering *LoweringInfo = TM.getTargetLowering();
485
486  const Function *F = MF.getFunction();
487  bool JTInDiffSection = false;
488  if (F->isWeakForLinker() ||
489      (IsPic && !LoweringInfo->usesGlobalOffsetTable())) {
490    // In PIC mode, we need to emit the jump table to the same section as the
491    // function body itself, otherwise the label differences won't make sense.
492    // We should also do if the section name is NULL or function is declared in
493    // discardable section.
494    OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang,
495                                                                    TM));
496  } else {
497    // Otherwise, drop it in the readonly section.
498    const MCSection *ReadOnlySection =
499      getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
500    OutStreamer.SwitchSection(ReadOnlySection);
501    JTInDiffSection = true;
502  }
503
504  EmitAlignment(Log2_32(MJTI->getAlignment()));
505
506  for (unsigned i = 0, e = JT.size(); i != e; ++i) {
507    const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
508
509    // If this jump table was deleted, ignore it.
510    if (JTBBs.empty()) continue;
511
512    // For PIC codegen, if possible we want to use the SetDirective to reduce
513    // the number of relocations the assembler will generate for the jump table.
514    // Set directives are all printed before the jump table itself.
515    SmallPtrSet<MachineBasicBlock*, 16> EmittedSets;
516    if (MAI->getSetDirective() && IsPic)
517      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
518        if (EmittedSets.insert(JTBBs[ii]))
519          printPICJumpTableSetLabel(i, JTBBs[ii]);
520
521    // On some targets (e.g. Darwin) we want to emit two consequtive labels
522    // before each jump table.  The first label is never referenced, but tells
523    // the assembler and linker the extents of the jump table object.  The
524    // second label is actually referenced by the code.
525    if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0])
526      OutStreamer.EmitLabel(GetJTISymbol(i, true));
527
528    OutStreamer.EmitLabel(GetJTISymbol(i));
529
530    for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
531      printPICJumpTableEntry(MJTI, JTBBs[ii], i);
532      O << '\n';
533    }
534  }
535}
536
537void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
538                                        const MachineBasicBlock *MBB,
539                                        unsigned uid)  const {
540  bool isPIC = TM.getRelocationModel() == Reloc::PIC_;
541
542  // Use JumpTableDirective otherwise honor the entry size from the jump table
543  // info.
544  const char *JTEntryDirective = MAI->getJumpTableDirective(isPIC);
545  bool HadJTEntryDirective = JTEntryDirective != NULL;
546  if (!HadJTEntryDirective) {
547    JTEntryDirective = MJTI->getEntrySize() == 4 ?
548      MAI->getData32bitsDirective() : MAI->getData64bitsDirective();
549  }
550
551  O << JTEntryDirective << ' ';
552
553  // If we have emitted set directives for the jump table entries, print
554  // them rather than the entries themselves.  If we're emitting PIC, then
555  // emit the table entries as differences between two text section labels.
556  // If we're emitting non-PIC code, then emit the entries as direct
557  // references to the target basic blocks.
558  if (!isPIC) {
559    O << *GetMBBSymbol(MBB->getNumber());
560  } else if (MAI->getSetDirective()) {
561    O << MAI->getPrivateGlobalPrefix() << getFunctionNumber()
562      << '_' << uid << "_set_" << MBB->getNumber();
563  } else {
564    O << *GetMBBSymbol(MBB->getNumber());
565    // If the arch uses custom Jump Table directives, don't calc relative to
566    // JT.
567    if (!HadJTEntryDirective)
568      O << '-' << *GetJTISymbol(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->hasNoDeadStrip())    // 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      StringRef Sym(".constructors_used");
602      OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
603                                      MCStreamer::Reference);
604    }
605    return true;
606  }
607
608  if (GV->getName() == "llvm.global_dtors") {
609    OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
610    EmitAlignment(Align, 0);
611    EmitXXStructorList(GV->getInitializer());
612
613    if (TM.getRelocationModel() == Reloc::Static &&
614        MAI->hasStaticCtorDtorReferenceInStaticMode()) {
615      StringRef Sym(".destructors_used");
616      OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
617                                      MCStreamer::Reference);
618    }
619    return true;
620  }
621
622  return false;
623}
624
625/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
626/// global in the specified llvm.used list for which emitUsedDirectiveFor
627/// is true, as being used with this directive.
628void AsmPrinter::EmitLLVMUsedList(Constant *List) {
629  // Should be an array of 'i8*'.
630  ConstantArray *InitList = dyn_cast<ConstantArray>(List);
631  if (InitList == 0) return;
632
633  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
634    const GlobalValue *GV =
635      dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
636    if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang))
637      OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(GV),
638                                      MCStreamer::NoDeadStrip);
639  }
640}
641
642/// EmitXXStructorList - Emit the ctor or dtor list.  This just prints out the
643/// function pointers, ignoring the init priority.
644void AsmPrinter::EmitXXStructorList(Constant *List) {
645  // Should be an array of '{ int, void ()* }' structs.  The first value is the
646  // init priority, which we ignore.
647  if (!isa<ConstantArray>(List)) return;
648  ConstantArray *InitList = cast<ConstantArray>(List);
649  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
650    if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
651      if (CS->getNumOperands() != 2) return;  // Not array of 2-element structs.
652
653      if (CS->getOperand(1)->isNullValue())
654        return;  // Found a null terminator, exit printing.
655      // Emit the function pointer.
656      EmitGlobalConstant(CS->getOperand(1));
657    }
658}
659
660//===--------------------------------------------------------------------===//
661// Emission and print routines
662//
663
664/// EmitInt8 - Emit a byte directive and value.
665///
666void AsmPrinter::EmitInt8(int Value) const {
667  OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/);
668}
669
670/// EmitInt16 - Emit a short directive and value.
671///
672void AsmPrinter::EmitInt16(int Value) const {
673  OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/);
674}
675
676/// EmitInt32 - Emit a long directive and value.
677///
678void AsmPrinter::EmitInt32(int Value) const {
679  OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/);
680}
681
682/// EmitInt64 - Emit a long long directive and value.
683///
684void AsmPrinter::EmitInt64(uint64_t Value) const {
685  OutStreamer.EmitIntValue(Value, 8, 0/*addrspace*/);
686}
687
688
689/// toOctal - Convert the low order bits of X into an octal digit.
690///
691static inline char toOctal(int X) {
692  return (X&7)+'0';
693}
694
695/// printStringChar - Print a char, escaped if necessary.
696///
697static void printStringChar(formatted_raw_ostream &O, unsigned char C) {
698  if (C == '"') {
699    O << "\\\"";
700  } else if (C == '\\') {
701    O << "\\\\";
702  } else if (isprint((unsigned char)C)) {
703    O << C;
704  } else {
705    switch(C) {
706    case '\b': O << "\\b"; break;
707    case '\f': O << "\\f"; break;
708    case '\n': O << "\\n"; break;
709    case '\r': O << "\\r"; break;
710    case '\t': O << "\\t"; break;
711    default:
712      O << '\\';
713      O << toOctal(C >> 6);
714      O << toOctal(C >> 3);
715      O << toOctal(C >> 0);
716      break;
717    }
718  }
719}
720
721/// EmitFile - Emit a .file directive.
722void AsmPrinter::EmitFile(unsigned Number, StringRef Name) const {
723  O << "\t.file\t" << Number << " \"";
724  for (unsigned i = 0, N = Name.size(); i < N; ++i)
725    printStringChar(O, Name[i]);
726  O << '\"';
727}
728
729
730//===----------------------------------------------------------------------===//
731
732// EmitAlignment - Emit an alignment directive to the specified power of
733// two boundary.  For example, if you pass in 3 here, you will get an 8
734// byte alignment.  If a global value is specified, and if that global has
735// an explicit alignment requested, it will unconditionally override the
736// alignment request.  However, if ForcedAlignBits is specified, this value
737// has final say: the ultimate alignment will be the max of ForcedAlignBits
738// and the alignment computed with NumBits and the global.
739//
740// The algorithm is:
741//     Align = NumBits;
742//     if (GV && GV->hasalignment) Align = GV->getalignment();
743//     Align = std::max(Align, ForcedAlignBits);
744//
745void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
746                               unsigned ForcedAlignBits,
747                               bool UseFillExpr) const {
748  if (GV && GV->getAlignment())
749    NumBits = Log2_32(GV->getAlignment());
750  NumBits = std::max(NumBits, ForcedAlignBits);
751
752  if (NumBits == 0) return;   // No need to emit alignment.
753
754  unsigned FillValue = 0;
755  if (getCurrentSection()->getKind().isText())
756    FillValue = MAI->getTextAlignFillValue();
757
758  OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0);
759}
760
761// Print out the specified constant, without a storage class.  Only the
762// constants valid in constant expressions can occur here.
763void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
764  if (CV->isNullValue() || isa<UndefValue>(CV)) {
765    O << '0';
766    return;
767  }
768
769  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
770    O << CI->getZExtValue();
771    return;
772  }
773
774  if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
775    // This is a constant address for a global variable or function. Use the
776    // name of the variable or function as the address value.
777    O << *GetGlobalValueSymbol(GV);
778    return;
779  }
780
781  if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV)) {
782    O << *GetBlockAddressSymbol(BA);
783    return;
784  }
785
786  const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
787  if (CE == 0) {
788    llvm_unreachable("Unknown constant value!");
789    O << '0';
790    return;
791  }
792
793  switch (CE->getOpcode()) {
794  case Instruction::ZExt:
795  case Instruction::SExt:
796  case Instruction::FPTrunc:
797  case Instruction::FPExt:
798  case Instruction::UIToFP:
799  case Instruction::SIToFP:
800  case Instruction::FPToUI:
801  case Instruction::FPToSI:
802  default:
803    llvm_unreachable("FIXME: Don't support this constant cast expr");
804  case Instruction::GetElementPtr: {
805    // generate a symbolic expression for the byte address
806    const TargetData *TD = TM.getTargetData();
807    const Constant *ptrVal = CE->getOperand(0);
808    SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
809    int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
810                                          idxVec.size());
811    if (Offset == 0)
812      return EmitConstantValueOnly(ptrVal);
813
814    // Truncate/sext the offset to the pointer size.
815    if (TD->getPointerSizeInBits() != 64) {
816      int SExtAmount = 64-TD->getPointerSizeInBits();
817      Offset = (Offset << SExtAmount) >> SExtAmount;
818    }
819
820    if (Offset)
821      O << '(';
822    EmitConstantValueOnly(ptrVal);
823    if (Offset > 0)
824      O << ") + " << Offset;
825    else
826      O << ") - " << -Offset;
827    return;
828  }
829  case Instruction::BitCast:
830    return EmitConstantValueOnly(CE->getOperand(0));
831
832  case Instruction::IntToPtr: {
833    // Handle casts to pointers by changing them into casts to the appropriate
834    // integer type.  This promotes constant folding and simplifies this code.
835    const TargetData *TD = TM.getTargetData();
836    Constant *Op = CE->getOperand(0);
837    Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(CV->getContext()),
838                                      false/*ZExt*/);
839    return EmitConstantValueOnly(Op);
840  }
841
842  case Instruction::PtrToInt: {
843    // Support only foldable casts to/from pointers that can be eliminated by
844    // changing the pointer to the appropriately sized integer type.
845    Constant *Op = CE->getOperand(0);
846    const Type *Ty = CE->getType();
847    const TargetData *TD = TM.getTargetData();
848
849    // We can emit the pointer value into this slot if the slot is an
850    // integer slot greater or equal to the size of the pointer.
851    if (TD->getTypeAllocSize(Ty) == TD->getTypeAllocSize(Op->getType()))
852      return EmitConstantValueOnly(Op);
853
854    O << "((";
855    EmitConstantValueOnly(Op);
856    APInt ptrMask =
857      APInt::getAllOnesValue(TD->getTypeAllocSizeInBits(Op->getType()));
858
859    SmallString<40> S;
860    ptrMask.toStringUnsigned(S);
861    O << ") & " << S.str() << ')';
862    return;
863  }
864
865  case Instruction::Trunc:
866    // We emit the value and depend on the assembler to truncate the generated
867    // expression properly.  This is important for differences between
868    // blockaddress labels.  Since the two labels are in the same function, it
869    // is reasonable to treat their delta as a 32-bit value.
870    return EmitConstantValueOnly(CE->getOperand(0));
871
872  case Instruction::Add:
873  case Instruction::Sub:
874  case Instruction::And:
875  case Instruction::Or:
876  case Instruction::Xor:
877    O << '(';
878    EmitConstantValueOnly(CE->getOperand(0));
879    O << ')';
880    switch (CE->getOpcode()) {
881    case Instruction::Add:
882     O << " + ";
883     break;
884    case Instruction::Sub:
885     O << " - ";
886     break;
887    case Instruction::And:
888     O << " & ";
889     break;
890    case Instruction::Or:
891     O << " | ";
892     break;
893    case Instruction::Xor:
894     O << " ^ ";
895     break;
896    default:
897     break;
898    }
899    O << '(';
900    EmitConstantValueOnly(CE->getOperand(1));
901    O << ')';
902    break;
903  }
904}
905
906static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace,
907                                    AsmPrinter &AP) {
908  if (AddrSpace != 0 || !CA->isString()) {
909    // Not a string.  Print the values in successive locations
910    for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
911      AP.EmitGlobalConstant(CA->getOperand(i), AddrSpace);
912    return;
913  }
914
915  // Otherwise, it can be emitted as .ascii.
916  SmallVector<char, 128> TmpVec;
917  TmpVec.reserve(CA->getNumOperands());
918  for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
919    TmpVec.push_back(cast<ConstantInt>(CA->getOperand(i))->getZExtValue());
920
921  AP.OutStreamer.EmitBytes(StringRef(TmpVec.data(), TmpVec.size()), AddrSpace);
922}
923
924static void EmitGlobalConstantVector(const ConstantVector *CV,
925                                     unsigned AddrSpace, AsmPrinter &AP) {
926  for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
927    AP.EmitGlobalConstant(CV->getOperand(i), AddrSpace);
928}
929
930static void EmitGlobalConstantStruct(const ConstantStruct *CS,
931                                     unsigned AddrSpace, AsmPrinter &AP) {
932  // Print the fields in successive locations. Pad to align if needed!
933  const TargetData *TD = AP.TM.getTargetData();
934  unsigned Size = TD->getTypeAllocSize(CS->getType());
935  const StructLayout *Layout = TD->getStructLayout(CS->getType());
936  uint64_t SizeSoFar = 0;
937  for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
938    const Constant *Field = CS->getOperand(i);
939
940    // Check if padding is needed and insert one or more 0s.
941    uint64_t FieldSize = TD->getTypeAllocSize(Field->getType());
942    uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
943                        - Layout->getElementOffset(i)) - FieldSize;
944    SizeSoFar += FieldSize + PadSize;
945
946    // Now print the actual field value.
947    AP.EmitGlobalConstant(Field, AddrSpace);
948
949    // Insert padding - this may include padding to increase the size of the
950    // current field up to the ABI size (if the struct is not packed) as well
951    // as padding to ensure that the next field starts at the right offset.
952    AP.OutStreamer.EmitZeros(PadSize, AddrSpace);
953  }
954  assert(SizeSoFar == Layout->getSizeInBytes() &&
955         "Layout of constant struct may be incorrect!");
956}
957
958static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace,
959                                 AsmPrinter &AP) {
960  // FP Constants are printed as integer constants to avoid losing
961  // precision.
962  if (CFP->getType()->isDoubleTy()) {
963    if (AP.VerboseAsm) {
964      double Val = CFP->getValueAPF().convertToDouble();
965      AP.OutStreamer.GetCommentOS() << "double " << Val << '\n';
966    }
967
968    uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
969    AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
970    return;
971  }
972
973  if (CFP->getType()->isFloatTy()) {
974    if (AP.VerboseAsm) {
975      float Val = CFP->getValueAPF().convertToFloat();
976      AP.OutStreamer.GetCommentOS() << "float " << Val << '\n';
977    }
978    uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
979    AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace);
980    return;
981  }
982
983  if (CFP->getType()->isX86_FP80Ty()) {
984    // all long double variants are printed as hex
985    // api needed to prevent premature destruction
986    APInt API = CFP->getValueAPF().bitcastToAPInt();
987    const uint64_t *p = API.getRawData();
988    if (AP.VerboseAsm) {
989      // Convert to double so we can print the approximate val as a comment.
990      APFloat DoubleVal = CFP->getValueAPF();
991      bool ignored;
992      DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
993                        &ignored);
994      AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= "
995        << DoubleVal.convertToDouble() << '\n';
996    }
997
998    if (AP.TM.getTargetData()->isBigEndian()) {
999      AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1000      AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1001    } else {
1002      AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1003      AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1004    }
1005
1006    // Emit the tail padding for the long double.
1007    const TargetData &TD = *AP.TM.getTargetData();
1008    AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) -
1009                             TD.getTypeStoreSize(CFP->getType()), AddrSpace);
1010    return;
1011  }
1012
1013  assert(CFP->getType()->isPPC_FP128Ty() &&
1014         "Floating point constant type not handled");
1015  // All long double variants are printed as hex api needed to prevent
1016  // premature destruction.
1017  APInt API = CFP->getValueAPF().bitcastToAPInt();
1018  const uint64_t *p = API.getRawData();
1019  if (AP.TM.getTargetData()->isBigEndian()) {
1020    AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1021    AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1022  } else {
1023    AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1024    AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1025  }
1026}
1027
1028static void EmitGlobalConstantLargeInt(const ConstantInt *CI,
1029                                       unsigned AddrSpace, AsmPrinter &AP) {
1030  const TargetData *TD = AP.TM.getTargetData();
1031  unsigned BitWidth = CI->getBitWidth();
1032  assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
1033
1034  // We don't expect assemblers to support integer data directives
1035  // for more than 64 bits, so we emit the data in at most 64-bit
1036  // quantities at a time.
1037  const uint64_t *RawData = CI->getValue().getRawData();
1038  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1039    uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i];
1040    AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1041  }
1042}
1043
1044/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1045void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1046  if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) {
1047    uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1048    return OutStreamer.EmitZeros(Size, AddrSpace);
1049  }
1050
1051  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1052    unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1053    switch (Size) {
1054    case 1:
1055    case 2:
1056    case 4:
1057    case 8:
1058      if (VerboseAsm)
1059        OutStreamer.GetCommentOS() << format("0x%llx\n", CI->getZExtValue());
1060      OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace);
1061      return;
1062    default:
1063      EmitGlobalConstantLargeInt(CI, AddrSpace, *this);
1064      return;
1065    }
1066  }
1067
1068  if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
1069    return EmitGlobalConstantArray(CVA, AddrSpace, *this);
1070
1071  if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
1072    return EmitGlobalConstantStruct(CVS, AddrSpace, *this);
1073
1074  if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
1075    return EmitGlobalConstantFP(CFP, AddrSpace, *this);
1076
1077  if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
1078    return EmitGlobalConstantVector(V, AddrSpace, *this);
1079
1080  if (isa<ConstantPointerNull>(CV)) {
1081    unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1082    OutStreamer.EmitIntValue(0, Size, AddrSpace);
1083    return;
1084  }
1085
1086  // Otherwise, it must be a ConstantExpr.  Emit the data directive, then emit
1087  // the expression value.
1088  switch (TM.getTargetData()->getTypeAllocSize(CV->getType())) {
1089  case 0: return;
1090  case 1: O << MAI->getData8bitsDirective(AddrSpace); break;
1091  case 2: O << MAI->getData16bitsDirective(AddrSpace); break;
1092  case 4: O << MAI->getData32bitsDirective(AddrSpace); break;
1093  case 8:
1094    if (const char *Dir = MAI->getData64bitsDirective(AddrSpace)) {
1095      O << Dir;
1096      break;
1097    }
1098    // FALL THROUGH.
1099  default:
1100    llvm_unreachable("Target cannot handle given data directive width!");
1101    return;
1102  }
1103
1104  EmitConstantValueOnly(CV);
1105  O << '\n';
1106}
1107
1108void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1109  // Target doesn't support this yet!
1110  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1111}
1112
1113/// PrintSpecial - Print information related to the specified machine instr
1114/// that is independent of the operand, and may be independent of the instr
1115/// itself.  This can be useful for portably encoding the comment character
1116/// or other bits of target-specific knowledge into the asmstrings.  The
1117/// syntax used is ${:comment}.  Targets can override this to add support
1118/// for their own strange codes.
1119void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1120  if (!strcmp(Code, "private")) {
1121    O << MAI->getPrivateGlobalPrefix();
1122  } else if (!strcmp(Code, "comment")) {
1123    if (VerboseAsm)
1124      O << MAI->getCommentString();
1125  } else if (!strcmp(Code, "uid")) {
1126    // Comparing the address of MI isn't sufficient, because machineinstrs may
1127    // be allocated to the same address across functions.
1128    const Function *ThisF = MI->getParent()->getParent()->getFunction();
1129
1130    // If this is a new LastFn instruction, bump the counter.
1131    if (LastMI != MI || LastFn != ThisF) {
1132      ++Counter;
1133      LastMI = MI;
1134      LastFn = ThisF;
1135    }
1136    O << Counter;
1137  } else {
1138    std::string msg;
1139    raw_string_ostream Msg(msg);
1140    Msg << "Unknown special formatter '" << Code
1141         << "' for machine instr: " << *MI;
1142    llvm_report_error(Msg.str());
1143  }
1144}
1145
1146/// processDebugLoc - Processes the debug information of each machine
1147/// instruction's DebugLoc.
1148void AsmPrinter::processDebugLoc(const MachineInstr *MI,
1149                                 bool BeforePrintingInsn) {
1150  if (!MAI || !DW || !MAI->doesSupportDebugInformation()
1151      || !DW->ShouldEmitDwarfDebug())
1152    return;
1153  DebugLoc DL = MI->getDebugLoc();
1154  if (DL.isUnknown())
1155    return;
1156  DILocation CurDLT = MF->getDILocation(DL);
1157  if (CurDLT.getScope().isNull())
1158    return;
1159
1160  if (!BeforePrintingInsn) {
1161    // After printing instruction
1162    DW->EndScope(MI);
1163  } else if (CurDLT.getNode() != PrevDLT) {
1164    unsigned L = DW->RecordSourceLine(CurDLT.getLineNumber(),
1165                                      CurDLT.getColumnNumber(),
1166                                      CurDLT.getScope().getNode());
1167    printLabel(L);
1168    O << '\n';
1169    DW->BeginScope(MI, L);
1170    PrevDLT = CurDLT.getNode();
1171  }
1172}
1173
1174
1175/// printInlineAsm - This method formats and prints the specified machine
1176/// instruction that is an inline asm.
1177void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1178  unsigned NumOperands = MI->getNumOperands();
1179
1180  // Count the number of register definitions.
1181  unsigned NumDefs = 0;
1182  for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1183       ++NumDefs)
1184    assert(NumDefs != NumOperands-1 && "No asm string?");
1185
1186  assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1187
1188  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1189  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1190
1191  O << '\t';
1192
1193  // If this asmstr is empty, just print the #APP/#NOAPP markers.
1194  // These are useful to see where empty asm's wound up.
1195  if (AsmStr[0] == 0) {
1196    O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1197    O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
1198    return;
1199  }
1200
1201  O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1202
1203  // The variant of the current asmprinter.
1204  int AsmPrinterVariant = MAI->getAssemblerDialect();
1205
1206  int CurVariant = -1;            // The number of the {.|.|.} region we are in.
1207  const char *LastEmitted = AsmStr; // One past the last character emitted.
1208
1209  while (*LastEmitted) {
1210    switch (*LastEmitted) {
1211    default: {
1212      // Not a special case, emit the string section literally.
1213      const char *LiteralEnd = LastEmitted+1;
1214      while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1215             *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1216        ++LiteralEnd;
1217      if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1218        O.write(LastEmitted, LiteralEnd-LastEmitted);
1219      LastEmitted = LiteralEnd;
1220      break;
1221    }
1222    case '\n':
1223      ++LastEmitted;   // Consume newline character.
1224      O << '\n';       // Indent code with newline.
1225      break;
1226    case '$': {
1227      ++LastEmitted;   // Consume '$' character.
1228      bool Done = true;
1229
1230      // Handle escapes.
1231      switch (*LastEmitted) {
1232      default: Done = false; break;
1233      case '$':     // $$ -> $
1234        if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1235          O << '$';
1236        ++LastEmitted;  // Consume second '$' character.
1237        break;
1238      case '(':             // $( -> same as GCC's { character.
1239        ++LastEmitted;      // Consume '(' character.
1240        if (CurVariant != -1) {
1241          llvm_report_error("Nested variants found in inline asm string: '"
1242                            + std::string(AsmStr) + "'");
1243        }
1244        CurVariant = 0;     // We're in the first variant now.
1245        break;
1246      case '|':
1247        ++LastEmitted;  // consume '|' character.
1248        if (CurVariant == -1)
1249          O << '|';       // this is gcc's behavior for | outside a variant
1250        else
1251          ++CurVariant;   // We're in the next variant.
1252        break;
1253      case ')':         // $) -> same as GCC's } char.
1254        ++LastEmitted;  // consume ')' character.
1255        if (CurVariant == -1)
1256          O << '}';     // this is gcc's behavior for } outside a variant
1257        else
1258          CurVariant = -1;
1259        break;
1260      }
1261      if (Done) break;
1262
1263      bool HasCurlyBraces = false;
1264      if (*LastEmitted == '{') {     // ${variable}
1265        ++LastEmitted;               // Consume '{' character.
1266        HasCurlyBraces = true;
1267      }
1268
1269      // If we have ${:foo}, then this is not a real operand reference, it is a
1270      // "magic" string reference, just like in .td files.  Arrange to call
1271      // PrintSpecial.
1272      if (HasCurlyBraces && *LastEmitted == ':') {
1273        ++LastEmitted;
1274        const char *StrStart = LastEmitted;
1275        const char *StrEnd = strchr(StrStart, '}');
1276        if (StrEnd == 0) {
1277          llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1278                            + std::string(AsmStr) + "'");
1279        }
1280
1281        std::string Val(StrStart, StrEnd);
1282        PrintSpecial(MI, Val.c_str());
1283        LastEmitted = StrEnd+1;
1284        break;
1285      }
1286
1287      const char *IDStart = LastEmitted;
1288      char *IDEnd;
1289      errno = 0;
1290      long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1291      if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1292        llvm_report_error("Bad $ operand number in inline asm string: '"
1293                          + std::string(AsmStr) + "'");
1294      }
1295      LastEmitted = IDEnd;
1296
1297      char Modifier[2] = { 0, 0 };
1298
1299      if (HasCurlyBraces) {
1300        // If we have curly braces, check for a modifier character.  This
1301        // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1302        if (*LastEmitted == ':') {
1303          ++LastEmitted;    // Consume ':' character.
1304          if (*LastEmitted == 0) {
1305            llvm_report_error("Bad ${:} expression in inline asm string: '"
1306                              + std::string(AsmStr) + "'");
1307          }
1308
1309          Modifier[0] = *LastEmitted;
1310          ++LastEmitted;    // Consume modifier character.
1311        }
1312
1313        if (*LastEmitted != '}') {
1314          llvm_report_error("Bad ${} expression in inline asm string: '"
1315                            + std::string(AsmStr) + "'");
1316        }
1317        ++LastEmitted;    // Consume '}' character.
1318      }
1319
1320      if ((unsigned)Val >= NumOperands-1) {
1321        llvm_report_error("Invalid $ operand number in inline asm string: '"
1322                          + std::string(AsmStr) + "'");
1323      }
1324
1325      // Okay, we finally have a value number.  Ask the target to print this
1326      // operand!
1327      if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1328        unsigned OpNo = 1;
1329
1330        bool Error = false;
1331
1332        // Scan to find the machine operand number for the operand.
1333        for (; Val; --Val) {
1334          if (OpNo >= MI->getNumOperands()) break;
1335          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1336          OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1337        }
1338
1339        if (OpNo >= MI->getNumOperands()) {
1340          Error = true;
1341        } else {
1342          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1343          ++OpNo;  // Skip over the ID number.
1344
1345          if (Modifier[0] == 'l')  // labels are target independent
1346            O << *GetMBBSymbol(MI->getOperand(OpNo).getMBB()->getNumber());
1347          else {
1348            AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1349            if ((OpFlags & 7) == 4) {
1350              Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1351                                                Modifier[0] ? Modifier : 0);
1352            } else {
1353              Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1354                                          Modifier[0] ? Modifier : 0);
1355            }
1356          }
1357        }
1358        if (Error) {
1359          std::string msg;
1360          raw_string_ostream Msg(msg);
1361          Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n";
1362          MI->print(Msg);
1363          llvm_report_error(Msg.str());
1364        }
1365      }
1366      break;
1367    }
1368    }
1369  }
1370  O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd();
1371}
1372
1373/// printImplicitDef - This method prints the specified machine instruction
1374/// that is an implicit def.
1375void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1376  if (!VerboseAsm) return;
1377  O.PadToColumn(MAI->getCommentColumn());
1378  O << MAI->getCommentString() << " implicit-def: "
1379    << TRI->getName(MI->getOperand(0).getReg());
1380}
1381
1382void AsmPrinter::printKill(const MachineInstr *MI) const {
1383  if (!VerboseAsm) return;
1384  O.PadToColumn(MAI->getCommentColumn());
1385  O << MAI->getCommentString() << " kill:";
1386  for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) {
1387    const MachineOperand &op = MI->getOperand(n);
1388    assert(op.isReg() && "KILL instruction must have only register operands");
1389    O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>");
1390  }
1391}
1392
1393/// printLabel - This method prints a local label used by debug and
1394/// exception handling tables.
1395void AsmPrinter::printLabel(const MachineInstr *MI) const {
1396  printLabel(MI->getOperand(0).getImm());
1397}
1398
1399void AsmPrinter::printLabel(unsigned Id) const {
1400  O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':';
1401}
1402
1403/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1404/// instruction, using the specified assembler variant.  Targets should
1405/// override this to format as appropriate.
1406bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1407                                 unsigned AsmVariant, const char *ExtraCode) {
1408  // Target doesn't support this yet!
1409  return true;
1410}
1411
1412bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1413                                       unsigned AsmVariant,
1414                                       const char *ExtraCode) {
1415  // Target doesn't support this yet!
1416  return true;
1417}
1418
1419MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA,
1420                                            const char *Suffix) const {
1421  return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock(), Suffix);
1422}
1423
1424MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F,
1425                                            const BasicBlock *BB,
1426                                            const char *Suffix) const {
1427  assert(BB->hasName() &&
1428         "Address of anonymous basic block not supported yet!");
1429
1430  // This code must use the function name itself, and not the function number,
1431  // since it must be possible to generate the label name from within other
1432  // functions.
1433  SmallString<60> FnName;
1434  Mang->getNameWithPrefix(FnName, F, false);
1435
1436  // FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME!
1437  SmallString<60> NameResult;
1438  Mang->getNameWithPrefix(NameResult,
1439                          StringRef("BA") + Twine((unsigned)FnName.size()) +
1440                          "_" + FnName.str() + "_" + BB->getName() + Suffix,
1441                          Mangler::Private);
1442
1443  return OutContext.GetOrCreateSymbol(NameResult.str());
1444}
1445
1446MCSymbol *AsmPrinter::GetMBBSymbol(unsigned MBBID) const {
1447  SmallString<60> Name;
1448  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "BB"
1449    << getFunctionNumber() << '_' << MBBID;
1450  return OutContext.GetOrCreateSymbol(Name.str());
1451}
1452
1453/// GetCPISymbol - Return the symbol for the specified constant pool entry.
1454MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
1455  SmallString<60> Name;
1456  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI"
1457    << getFunctionNumber() << '_' << CPID;
1458  return OutContext.GetOrCreateSymbol(Name.str());
1459}
1460
1461/// GetJTISymbol - Return the symbol for the specified jump table entry.
1462MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
1463  const char *Prefix = isLinkerPrivate ? MAI->getLinkerPrivateGlobalPrefix() :
1464                                         MAI->getPrivateGlobalPrefix();
1465  SmallString<60> Name;
1466  raw_svector_ostream(Name) << Prefix << "JTI" << getFunctionNumber() << '_'
1467    << JTID;
1468  return OutContext.GetOrCreateSymbol(Name.str());
1469}
1470
1471/// GetGlobalValueSymbol - Return the MCSymbol for the specified global
1472/// value.
1473MCSymbol *AsmPrinter::GetGlobalValueSymbol(const GlobalValue *GV) const {
1474  SmallString<60> NameStr;
1475  Mang->getNameWithPrefix(NameStr, GV, false);
1476  return OutContext.GetOrCreateSymbol(NameStr.str());
1477}
1478
1479/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
1480/// global value name as its base, with the specified suffix, and where the
1481/// symbol is forced to have private linkage if ForcePrivate is true.
1482MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
1483                                                   StringRef Suffix,
1484                                                   bool ForcePrivate) const {
1485  SmallString<60> NameStr;
1486  Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
1487  NameStr.append(Suffix.begin(), Suffix.end());
1488  return OutContext.GetOrCreateSymbol(NameStr.str());
1489}
1490
1491/// GetExternalSymbolSymbol - Return the MCSymbol for the specified
1492/// ExternalSymbol.
1493MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
1494  SmallString<60> NameStr;
1495  Mang->getNameWithPrefix(NameStr, Sym);
1496  return OutContext.GetOrCreateSymbol(NameStr.str());
1497}
1498
1499
1500
1501/// PrintParentLoopComment - Print comments about parent loops of this one.
1502static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1503                                   unsigned FunctionNumber) {
1504  if (Loop == 0) return;
1505  PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
1506  OS.indent(Loop->getLoopDepth()*2)
1507    << "Parent Loop BB" << FunctionNumber << "_"
1508    << Loop->getHeader()->getNumber()
1509    << " Depth=" << Loop->getLoopDepth() << '\n';
1510}
1511
1512
1513/// PrintChildLoopComment - Print comments about child loops within
1514/// the loop for this basic block, with nesting.
1515static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1516                                  unsigned FunctionNumber) {
1517  // Add child loop information
1518  for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
1519    OS.indent((*CL)->getLoopDepth()*2)
1520      << "Child Loop BB" << FunctionNumber << "_"
1521      << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
1522      << '\n';
1523    PrintChildLoopComment(OS, *CL, FunctionNumber);
1524  }
1525}
1526
1527/// EmitComments - Pretty-print comments for basic blocks.
1528static void PrintBasicBlockLoopComments(const MachineBasicBlock &MBB,
1529                                        const MachineLoopInfo *LI,
1530                                        const AsmPrinter &AP) {
1531  // Add loop depth information
1532  const MachineLoop *Loop = LI->getLoopFor(&MBB);
1533  if (Loop == 0) return;
1534
1535  MachineBasicBlock *Header = Loop->getHeader();
1536  assert(Header && "No header for loop");
1537
1538  // If this block is not a loop header, just print out what is the loop header
1539  // and return.
1540  if (Header != &MBB) {
1541    AP.OutStreamer.AddComment("  in Loop: Header=BB" +
1542                              Twine(AP.getFunctionNumber())+"_" +
1543                              Twine(Loop->getHeader()->getNumber())+
1544                              " Depth="+Twine(Loop->getLoopDepth()));
1545    return;
1546  }
1547
1548  // Otherwise, it is a loop header.  Print out information about child and
1549  // parent loops.
1550  raw_ostream &OS = AP.OutStreamer.GetCommentOS();
1551
1552  PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
1553
1554  OS << "=>";
1555  OS.indent(Loop->getLoopDepth()*2-2);
1556
1557  OS << "This ";
1558  if (Loop->empty())
1559    OS << "Inner ";
1560  OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
1561
1562  PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
1563}
1564
1565
1566/// EmitBasicBlockStart - This method prints the label for the specified
1567/// MachineBasicBlock, an alignment (if present) and a comment describing
1568/// it if appropriate.
1569void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
1570  // Emit an alignment directive for this block, if needed.
1571  if (unsigned Align = MBB->getAlignment())
1572    EmitAlignment(Log2_32(Align));
1573
1574  // If the block has its address taken, emit a special label to satisfy
1575  // references to the block. This is done so that we don't need to
1576  // remember the number of this label, and so that we can make
1577  // forward references to labels without knowing what their numbers
1578  // will be.
1579  if (MBB->hasAddressTaken()) {
1580    const BasicBlock *BB = MBB->getBasicBlock();
1581    if (VerboseAsm)
1582      OutStreamer.AddComment("Address Taken");
1583    OutStreamer.EmitLabel(GetBlockAddressSymbol(BB->getParent(), BB));
1584  }
1585
1586  // Print the main label for the block.
1587  if (MBB->pred_empty() || MBB->isOnlyReachableByFallthrough()) {
1588    if (VerboseAsm) {
1589      // NOTE: Want this comment at start of line.
1590      O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':';
1591      if (const BasicBlock *BB = MBB->getBasicBlock())
1592        if (BB->hasName())
1593          OutStreamer.AddComment("%" + BB->getName());
1594
1595      PrintBasicBlockLoopComments(*MBB, LI, *this);
1596      OutStreamer.AddBlankLine();
1597    }
1598  } else {
1599    if (VerboseAsm) {
1600      if (const BasicBlock *BB = MBB->getBasicBlock())
1601        if (BB->hasName())
1602          OutStreamer.AddComment("%" + BB->getName());
1603      PrintBasicBlockLoopComments(*MBB, LI, *this);
1604    }
1605
1606    OutStreamer.EmitLabel(GetMBBSymbol(MBB->getNumber()));
1607  }
1608}
1609
1610/// printPICJumpTableSetLabel - This method prints a set label for the
1611/// specified MachineBasicBlock for a jumptable entry.
1612void AsmPrinter::printPICJumpTableSetLabel(unsigned uid,
1613                                           const MachineBasicBlock *MBB) const {
1614  if (!MAI->getSetDirective())
1615    return;
1616
1617  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1618    << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ','
1619    << *GetMBBSymbol(MBB->getNumber())
1620    << '-' << *GetJTISymbol(uid) << '\n';
1621}
1622
1623void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
1624                                           const MachineBasicBlock *MBB) const {
1625  if (!MAI->getSetDirective())
1626    return;
1627
1628  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1629    << getFunctionNumber() << '_' << uid << '_' << uid2
1630    << "_set_" << MBB->getNumber() << ','
1631    << *GetMBBSymbol(MBB->getNumber())
1632    << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1633    << '_' << uid << '_' << uid2 << '\n';
1634}
1635
1636void AsmPrinter::printVisibility(const MCSymbol *Sym,
1637                                 unsigned Visibility) const {
1638  if (Visibility == GlobalValue::HiddenVisibility) {
1639    if (const char *Directive = MAI->getHiddenDirective())
1640      O << Directive << *Sym << '\n';
1641  } else if (Visibility == GlobalValue::ProtectedVisibility) {
1642    if (const char *Directive = MAI->getProtectedDirective())
1643      O << Directive << *Sym << '\n';
1644  }
1645}
1646
1647void AsmPrinter::printOffset(int64_t Offset) const {
1648  if (Offset > 0)
1649    O << '+' << Offset;
1650  else if (Offset < 0)
1651    O << Offset;
1652}
1653
1654GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1655  if (!S->usesMetadata())
1656    return 0;
1657
1658  gcp_iterator GCPI = GCMetadataPrinters.find(S);
1659  if (GCPI != GCMetadataPrinters.end())
1660    return GCPI->second;
1661
1662  const char *Name = S->getName().c_str();
1663
1664  for (GCMetadataPrinterRegistry::iterator
1665         I = GCMetadataPrinterRegistry::begin(),
1666         E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1667    if (strcmp(Name, I->getName()) == 0) {
1668      GCMetadataPrinter *GMP = I->instantiate();
1669      GMP->S = S;
1670      GCMetadataPrinters.insert(std::make_pair(S, GMP));
1671      return GMP;
1672    }
1673
1674  errs() << "no GCMetadataPrinter registered for GC: " << Name << "\n";
1675  llvm_unreachable(0);
1676}
1677
1678/// EmitComments - Pretty-print comments for instructions
1679void AsmPrinter::EmitComments(const MachineInstr &MI) const {
1680  if (!VerboseAsm)
1681    return;
1682
1683  bool Newline = false;
1684
1685  if (!MI.getDebugLoc().isUnknown()) {
1686    DILocation DLT = MF->getDILocation(MI.getDebugLoc());
1687
1688    // Print source line info.
1689    O.PadToColumn(MAI->getCommentColumn());
1690    O << MAI->getCommentString() << ' ';
1691    DIScope Scope = DLT.getScope();
1692    // Omit the directory, because it's likely to be long and uninteresting.
1693    if (!Scope.isNull())
1694      O << Scope.getFilename();
1695    else
1696      O << "<unknown>";
1697    O << ':' << DLT.getLineNumber();
1698    if (DLT.getColumnNumber() != 0)
1699      O << ':' << DLT.getColumnNumber();
1700    Newline = true;
1701  }
1702
1703  // Check for spills and reloads
1704  int FI;
1705
1706  const MachineFrameInfo *FrameInfo =
1707    MI.getParent()->getParent()->getFrameInfo();
1708
1709  // We assume a single instruction only has a spill or reload, not
1710  // both.
1711  const MachineMemOperand *MMO;
1712  if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
1713    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1714      MMO = *MI.memoperands_begin();
1715      if (Newline) O << '\n';
1716      O.PadToColumn(MAI->getCommentColumn());
1717      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Reload";
1718      Newline = true;
1719    }
1720  }
1721  else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
1722    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1723      if (Newline) O << '\n';
1724      O.PadToColumn(MAI->getCommentColumn());
1725      O << MAI->getCommentString() << ' '
1726        << MMO->getSize() << "-byte Folded Reload";
1727      Newline = true;
1728    }
1729  }
1730  else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
1731    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1732      MMO = *MI.memoperands_begin();
1733      if (Newline) O << '\n';
1734      O.PadToColumn(MAI->getCommentColumn());
1735      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Spill";
1736      Newline = true;
1737    }
1738  }
1739  else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
1740    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1741      if (Newline) O << '\n';
1742      O.PadToColumn(MAI->getCommentColumn());
1743      O << MAI->getCommentString() << ' '
1744        << MMO->getSize() << "-byte Folded Spill";
1745      Newline = true;
1746    }
1747  }
1748
1749  // Check for spill-induced copies
1750  unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
1751  if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg,
1752                                      SrcSubIdx, DstSubIdx)) {
1753    if (MI.getAsmPrinterFlag(ReloadReuse)) {
1754      if (Newline) O << '\n';
1755      O.PadToColumn(MAI->getCommentColumn());
1756      O << MAI->getCommentString() << " Reload Reuse";
1757    }
1758  }
1759}
1760
1761