AsmPrinter.cpp revision c618c8aff46a8ec4d209d041404e780a0caaf77d 
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/MCExpr.h"
30#include "llvm/MC/MCInst.h"
31#include "llvm/MC/MCSection.h"
32#include "llvm/MC/MCStreamer.h"
33#include "llvm/MC/MCSymbol.h"
34#include "llvm/Support/CommandLine.h"
35#include "llvm/Support/ErrorHandling.h"
36#include "llvm/Support/Format.h"
37#include "llvm/Support/FormattedStream.h"
38#include "llvm/MC/MCAsmInfo.h"
39#include "llvm/Target/Mangler.h"
40#include "llvm/Target/TargetData.h"
41#include "llvm/Target/TargetInstrInfo.h"
42#include "llvm/Target/TargetLowering.h"
43#include "llvm/Target/TargetLoweringObjectFile.h"
44#include "llvm/Target/TargetOptions.h"
45#include "llvm/Target/TargetRegisterInfo.h"
46#include "llvm/ADT/SmallPtrSet.h"
47#include "llvm/ADT/SmallString.h"
48#include <cerrno>
49using namespace llvm;
50
51static cl::opt<cl::boolOrDefault>
52AsmVerbose("asm-verbose", cl::desc("Add comments to directives."),
53           cl::init(cl::BOU_UNSET));
54
55static bool getVerboseAsm(bool VDef) {
56  switch (AsmVerbose) {
57  default:
58  case cl::BOU_UNSET: return VDef;
59  case cl::BOU_TRUE:  return true;
60  case cl::BOU_FALSE: return false;
61  }
62}
63
64char AsmPrinter::ID = 0;
65AsmPrinter::AsmPrinter(formatted_raw_ostream &o, TargetMachine &tm,
66                       const MCAsmInfo *T, bool VDef)
67  : MachineFunctionPass(&ID), O(o),
68    TM(tm), MAI(T), TRI(tm.getRegisterInfo()),
69
70    OutContext(*new MCContext()),
71    // FIXME: Pass instprinter to streamer.
72    OutStreamer(*createAsmStreamer(OutContext, O, *T,
73                                   TM.getTargetData()->isLittleEndian(),
74                                   getVerboseAsm(VDef), 0)),
75
76    LastMI(0), LastFn(0), Counter(~0U), PrevDLT(NULL) {
77  DW = 0; MMI = 0;
78  VerboseAsm = getVerboseAsm(VDef);
79}
80
81AsmPrinter::~AsmPrinter() {
82  for (gcp_iterator I = GCMetadataPrinters.begin(),
83                    E = GCMetadataPrinters.end(); I != E; ++I)
84    delete I->second;
85
86  delete &OutStreamer;
87  delete &OutContext;
88}
89
90/// getFunctionNumber - Return a unique ID for the current function.
91///
92unsigned AsmPrinter::getFunctionNumber() const {
93  return MF->getFunctionNumber();
94}
95
96TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
97  return TM.getTargetLowering()->getObjFileLowering();
98}
99
100/// getCurrentSection() - Return the current section we are emitting to.
101const MCSection *AsmPrinter::getCurrentSection() const {
102  return OutStreamer.getCurrentSection();
103}
104
105
106void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
107  AU.setPreservesAll();
108  MachineFunctionPass::getAnalysisUsage(AU);
109  AU.addRequired<GCModuleInfo>();
110  if (VerboseAsm)
111    AU.addRequired<MachineLoopInfo>();
112}
113
114bool AsmPrinter::doInitialization(Module &M) {
115  // Initialize TargetLoweringObjectFile.
116  const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
117    .Initialize(OutContext, TM);
118
119  Mang = new Mangler(*MAI);
120
121  // Allow the target to emit any magic that it wants at the start of the file.
122  EmitStartOfAsmFile(M);
123
124  // Very minimal debug info. It is ignored if we emit actual debug info. If we
125  // don't, this at least helps the user find where a global came from.
126  if (MAI->hasSingleParameterDotFile()) {
127    // .file "foo.c"
128    OutStreamer.EmitFileDirective(M.getModuleIdentifier());
129  }
130
131  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
132  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
133  for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
134    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
135      MP->beginAssembly(O, *this, *MAI);
136
137  if (!M.getModuleInlineAsm().empty())
138    O << MAI->getCommentString() << " Start of file scope inline assembly\n"
139      << M.getModuleInlineAsm()
140      << '\n' << MAI->getCommentString()
141      << " End of file scope inline assembly\n";
142
143  MMI = getAnalysisIfAvailable<MachineModuleInfo>();
144  if (MMI)
145    MMI->AnalyzeModule(M);
146  DW = getAnalysisIfAvailable<DwarfWriter>();
147  if (DW)
148    DW->BeginModule(&M, MMI, O, this, MAI);
149
150  return false;
151}
152
153/// EmitGlobalVariable - Emit the specified global variable to the .s file.
154void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
155  if (!GV->hasInitializer())   // External globals require no code.
156    return;
157
158  // Check to see if this is a special global used by LLVM, if so, emit it.
159  if (EmitSpecialLLVMGlobal(GV))
160    return;
161
162  MCSymbol *GVSym = GetGlobalValueSymbol(GV);
163  printVisibility(GVSym, GV->getVisibility());
164
165  if (MAI->hasDotTypeDotSizeDirective())
166    OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
167
168  SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
169
170  const TargetData *TD = TM.getTargetData();
171  unsigned Size = TD->getTypeAllocSize(GV->getType()->getElementType());
172  unsigned AlignLog = TD->getPreferredAlignmentLog(GV);
173
174  // Handle common and BSS local symbols (.lcomm).
175  if (GVKind.isCommon() || GVKind.isBSSLocal()) {
176    if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
177
178    if (VerboseAsm) {
179      WriteAsOperand(OutStreamer.GetCommentOS(), GV,
180                     /*PrintType=*/false, GV->getParent());
181      OutStreamer.GetCommentOS() << '\n';
182    }
183
184    // Handle common symbols.
185    if (GVKind.isCommon()) {
186      // .comm _foo, 42, 4
187      OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
188      return;
189    }
190
191    // Handle local BSS symbols.
192    if (MAI->hasMachoZeroFillDirective()) {
193      const MCSection *TheSection =
194        getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
195      // .zerofill __DATA, __bss, _foo, 400, 5
196      OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
197      return;
198    }
199
200    if (MAI->hasLCOMMDirective()) {
201      // .lcomm _foo, 42
202      OutStreamer.EmitLocalCommonSymbol(GVSym, Size);
203      return;
204    }
205
206    // .local _foo
207    OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Local);
208    // .comm _foo, 42, 4
209    OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
210    return;
211  }
212
213  const MCSection *TheSection =
214    getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
215
216  // Handle the zerofill directive on darwin, which is a special form of BSS
217  // emission.
218  if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
219    // .globl _foo
220    OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
221    // .zerofill __DATA, __common, _foo, 400, 5
222    OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
223    return;
224  }
225
226  OutStreamer.SwitchSection(TheSection);
227
228  // TODO: Factor into an 'emit linkage' thing that is shared with function
229  // bodies.
230  switch (GV->getLinkage()) {
231  case GlobalValue::CommonLinkage:
232  case GlobalValue::LinkOnceAnyLinkage:
233  case GlobalValue::LinkOnceODRLinkage:
234  case GlobalValue::WeakAnyLinkage:
235  case GlobalValue::WeakODRLinkage:
236  case GlobalValue::LinkerPrivateLinkage:
237    if (MAI->getWeakDefDirective() != 0) {
238      // .globl _foo
239      OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
240      // .weak_definition _foo
241      OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
242    } else if (const char *LinkOnce = MAI->getLinkOnceDirective()) {
243      // .globl _foo
244      OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
245      // FIXME: linkonce should be a section attribute, handled by COFF Section
246      // assignment.
247      // http://sourceware.org/binutils/docs-2.20/as/Linkonce.html#Linkonce
248      // .linkonce same_size
249      O << LinkOnce;
250    } else {
251      // .weak _foo
252      OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
253    }
254    break;
255  case GlobalValue::DLLExportLinkage:
256  case GlobalValue::AppendingLinkage:
257    // FIXME: appending linkage variables should go into a section of
258    // their name or something.  For now, just emit them as external.
259  case GlobalValue::ExternalLinkage:
260    // If external or appending, declare as a global symbol.
261    // .globl _foo
262    OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
263    break;
264  case GlobalValue::PrivateLinkage:
265  case GlobalValue::InternalLinkage:
266     break;
267  default:
268    llvm_unreachable("Unknown linkage type!");
269  }
270
271  EmitAlignment(AlignLog, GV);
272  if (VerboseAsm) {
273    WriteAsOperand(OutStreamer.GetCommentOS(), GV,
274                   /*PrintType=*/false, GV->getParent());
275    OutStreamer.GetCommentOS() << '\n';
276  }
277  OutStreamer.EmitLabel(GVSym);
278
279  EmitGlobalConstant(GV->getInitializer());
280
281  if (MAI->hasDotTypeDotSizeDirective())
282    // .size foo, 42
283    OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext));
284
285  OutStreamer.AddBlankLine();
286}
287
288
289bool AsmPrinter::doFinalization(Module &M) {
290  // Emit global variables.
291  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
292       I != E; ++I)
293    EmitGlobalVariable(I);
294
295  // Emit final debug information.
296  if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
297    DW->EndModule();
298
299  // If the target wants to know about weak references, print them all.
300  if (MAI->getWeakRefDirective()) {
301    // FIXME: This is not lazy, it would be nice to only print weak references
302    // to stuff that is actually used.  Note that doing so would require targets
303    // to notice uses in operands (due to constant exprs etc).  This should
304    // happen with the MC stuff eventually.
305
306    // Print out module-level global variables here.
307    for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
308         I != E; ++I) {
309      if (!I->hasExternalWeakLinkage()) continue;
310      OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(I),
311                                      MCSA_WeakReference);
312    }
313
314    for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
315      if (!I->hasExternalWeakLinkage()) continue;
316      OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(I),
317                                      MCSA_WeakReference);
318    }
319  }
320
321  if (MAI->hasSetDirective()) {
322    OutStreamer.AddBlankLine();
323    for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
324         I != E; ++I) {
325      MCSymbol *Name = GetGlobalValueSymbol(I);
326
327      const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
328      MCSymbol *Target = GetGlobalValueSymbol(GV);
329
330      if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
331        OutStreamer.EmitSymbolAttribute(Name, MCSA_Global);
332      else if (I->hasWeakLinkage())
333        OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference);
334      else
335        assert(I->hasLocalLinkage() && "Invalid alias linkage");
336
337      printVisibility(Name, I->getVisibility());
338
339      // Emit the directives as assignments aka .set:
340      OutStreamer.EmitAssignment(Name,
341                                 MCSymbolRefExpr::Create(Target, OutContext));
342    }
343  }
344
345  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
346  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
347  for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
348    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
349      MP->finishAssembly(O, *this, *MAI);
350
351  // If we don't have any trampolines, then we don't require stack memory
352  // to be executable. Some targets have a directive to declare this.
353  Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
354  if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
355    if (MCSection *S = MAI->getNonexecutableStackSection(OutContext))
356      OutStreamer.SwitchSection(S);
357
358  // Allow the target to emit any magic that it wants at the end of the file,
359  // after everything else has gone out.
360  EmitEndOfAsmFile(M);
361
362  delete Mang; Mang = 0;
363  DW = 0; MMI = 0;
364
365  OutStreamer.Finish();
366  return false;
367}
368
369void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
370  this->MF = &MF;
371  // Get the function symbol.
372  CurrentFnSym = GetGlobalValueSymbol(MF.getFunction());
373
374  if (VerboseAsm)
375    LI = &getAnalysis<MachineLoopInfo>();
376}
377
378namespace {
379  // SectionCPs - Keep track the alignment, constpool entries per Section.
380  struct SectionCPs {
381    const MCSection *S;
382    unsigned Alignment;
383    SmallVector<unsigned, 4> CPEs;
384    SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
385  };
386}
387
388/// EmitConstantPool - Print to the current output stream assembly
389/// representations of the constants in the constant pool MCP. This is
390/// used to print out constants which have been "spilled to memory" by
391/// the code generator.
392///
393void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
394  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
395  if (CP.empty()) return;
396
397  // Calculate sections for constant pool entries. We collect entries to go into
398  // the same section together to reduce amount of section switch statements.
399  SmallVector<SectionCPs, 4> CPSections;
400  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
401    const MachineConstantPoolEntry &CPE = CP[i];
402    unsigned Align = CPE.getAlignment();
403
404    SectionKind Kind;
405    switch (CPE.getRelocationInfo()) {
406    default: llvm_unreachable("Unknown section kind");
407    case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
408    case 1:
409      Kind = SectionKind::getReadOnlyWithRelLocal();
410      break;
411    case 0:
412    switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
413    case 4:  Kind = SectionKind::getMergeableConst4(); break;
414    case 8:  Kind = SectionKind::getMergeableConst8(); break;
415    case 16: Kind = SectionKind::getMergeableConst16();break;
416    default: Kind = SectionKind::getMergeableConst(); break;
417    }
418    }
419
420    const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
421
422    // The number of sections are small, just do a linear search from the
423    // last section to the first.
424    bool Found = false;
425    unsigned SecIdx = CPSections.size();
426    while (SecIdx != 0) {
427      if (CPSections[--SecIdx].S == S) {
428        Found = true;
429        break;
430      }
431    }
432    if (!Found) {
433      SecIdx = CPSections.size();
434      CPSections.push_back(SectionCPs(S, Align));
435    }
436
437    if (Align > CPSections[SecIdx].Alignment)
438      CPSections[SecIdx].Alignment = Align;
439    CPSections[SecIdx].CPEs.push_back(i);
440  }
441
442  // Now print stuff into the calculated sections.
443  for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
444    OutStreamer.SwitchSection(CPSections[i].S);
445    EmitAlignment(Log2_32(CPSections[i].Alignment));
446
447    unsigned Offset = 0;
448    for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
449      unsigned CPI = CPSections[i].CPEs[j];
450      MachineConstantPoolEntry CPE = CP[CPI];
451
452      // Emit inter-object padding for alignment.
453      unsigned AlignMask = CPE.getAlignment() - 1;
454      unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
455      OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/);
456
457      const Type *Ty = CPE.getType();
458      Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
459
460      // Emit the label with a comment on it.
461      if (VerboseAsm) {
462        OutStreamer.GetCommentOS() << "constant pool ";
463        WriteTypeSymbolic(OutStreamer.GetCommentOS(), CPE.getType(),
464                          MF->getFunction()->getParent());
465        OutStreamer.GetCommentOS() << '\n';
466      }
467      OutStreamer.EmitLabel(GetCPISymbol(CPI));
468
469      if (CPE.isMachineConstantPoolEntry())
470        EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
471      else
472        EmitGlobalConstant(CPE.Val.ConstVal);
473    }
474  }
475}
476
477/// EmitJumpTableInfo - Print assembly representations of the jump tables used
478/// by the current function to the current output stream.
479///
480void AsmPrinter::EmitJumpTableInfo(MachineFunction &MF) {
481  MachineJumpTableInfo *MJTI = MF.getJumpTableInfo();
482  if (MJTI == 0) return;
483  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
484  if (JT.empty()) return;
485
486  // Pick the directive to use to print the jump table entries, and switch to
487  // the appropriate section.
488  const Function *F = MF.getFunction();
489  bool JTInDiffSection = false;
490  if (// 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      // FIXME: Need a better predicate for this: what about custom entries?
493      MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 ||
494      // We should also do if the section name is NULL or function is declared
495      // in discardable section
496      // FIXME: this isn't the right predicate, should be based on the MCSection
497      // for the function.
498      F->isWeakForLinker()) {
499    OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang,
500                                                                    TM));
501  } else {
502    // Otherwise, drop it in the readonly section.
503    const MCSection *ReadOnlySection =
504      getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
505    OutStreamer.SwitchSection(ReadOnlySection);
506    JTInDiffSection = true;
507  }
508
509  EmitAlignment(Log2_32(MJTI->getEntryAlignment(*TM.getTargetData())));
510
511  for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
512    const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
513
514    // If this jump table was deleted, ignore it.
515    if (JTBBs.empty()) continue;
516
517    // For the EK_LabelDifference32 entry, if the target supports .set, emit a
518    // .set directive for each unique entry.  This reduces the number of
519    // relocations the assembler will generate for the jump table.
520    if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 &&
521        MAI->hasSetDirective()) {
522      SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets;
523      const TargetLowering *TLI = TM.getTargetLowering();
524      const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(&MF, JTI,
525                                                             OutContext);
526      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
527        const MachineBasicBlock *MBB = JTBBs[ii];
528        if (!EmittedSets.insert(MBB)) continue;
529
530        // .set LJTSet, LBB32-base
531        const MCExpr *LHS =
532          MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext);
533        OutStreamer.EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
534                                MCBinaryExpr::CreateSub(LHS, Base, OutContext));
535      }
536    }
537
538    // On some targets (e.g. Darwin) we want to emit two consequtive labels
539    // before each jump table.  The first label is never referenced, but tells
540    // the assembler and linker the extents of the jump table object.  The
541    // second label is actually referenced by the code.
542    if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0])
543      // FIXME: This doesn't have to have any specific name, just any randomly
544      // named and numbered 'l' label would work.  Simplify GetJTISymbol.
545      OutStreamer.EmitLabel(GetJTISymbol(JTI, true));
546
547    OutStreamer.EmitLabel(GetJTISymbol(JTI));
548
549    for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
550      EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
551  }
552}
553
554/// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
555/// current stream.
556void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
557                                    const MachineBasicBlock *MBB,
558                                    unsigned UID) const {
559  const MCExpr *Value = 0;
560  switch (MJTI->getEntryKind()) {
561  case MachineJumpTableInfo::EK_Custom32:
562    Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, UID,
563                                                              OutContext);
564    break;
565  case MachineJumpTableInfo::EK_BlockAddress:
566    // EK_BlockAddress - Each entry is a plain address of block, e.g.:
567    //     .word LBB123
568    Value = MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext);
569    break;
570  case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
571    // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
572    // with a relocation as gp-relative, e.g.:
573    //     .gprel32 LBB123
574    MCSymbol *MBBSym = MBB->getSymbol(OutContext);
575    OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
576    return;
577  }
578
579  case MachineJumpTableInfo::EK_LabelDifference32: {
580    // EK_LabelDifference32 - Each entry is the address of the block minus
581    // the address of the jump table.  This is used for PIC jump tables where
582    // gprel32 is not supported.  e.g.:
583    //      .word LBB123 - LJTI1_2
584    // If the .set directive is supported, this is emitted as:
585    //      .set L4_5_set_123, LBB123 - LJTI1_2
586    //      .word L4_5_set_123
587
588    // If we have emitted set directives for the jump table entries, print
589    // them rather than the entries themselves.  If we're emitting PIC, then
590    // emit the table entries as differences between two text section labels.
591    if (MAI->hasSetDirective()) {
592      // If we used .set, reference the .set's symbol.
593      Value = MCSymbolRefExpr::Create(GetJTSetSymbol(UID, MBB->getNumber()),
594                                      OutContext);
595      break;
596    }
597    // Otherwise, use the difference as the jump table entry.
598    Value = MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext);
599    const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(UID), OutContext);
600    Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext);
601    break;
602  }
603  }
604
605  assert(Value && "Unknown entry kind!");
606
607  unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData());
608  OutStreamer.EmitValue(Value, EntrySize, /*addrspace*/0);
609}
610
611
612/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
613/// special global used by LLVM.  If so, emit it and return true, otherwise
614/// do nothing and return false.
615bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
616  if (GV->getName() == "llvm.used") {
617    if (MAI->hasNoDeadStrip())    // No need to emit this at all.
618      EmitLLVMUsedList(GV->getInitializer());
619    return true;
620  }
621
622  // Ignore debug and non-emitted data.  This handles llvm.compiler.used.
623  if (GV->getSection() == "llvm.metadata" ||
624      GV->hasAvailableExternallyLinkage())
625    return true;
626
627  if (!GV->hasAppendingLinkage()) return false;
628
629  assert(GV->hasInitializer() && "Not a special LLVM global!");
630
631  const TargetData *TD = TM.getTargetData();
632  unsigned Align = Log2_32(TD->getPointerPrefAlignment());
633  if (GV->getName() == "llvm.global_ctors") {
634    OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
635    EmitAlignment(Align, 0);
636    EmitXXStructorList(GV->getInitializer());
637
638    if (TM.getRelocationModel() == Reloc::Static &&
639        MAI->hasStaticCtorDtorReferenceInStaticMode()) {
640      StringRef Sym(".constructors_used");
641      OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
642                                      MCSA_Reference);
643    }
644    return true;
645  }
646
647  if (GV->getName() == "llvm.global_dtors") {
648    OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
649    EmitAlignment(Align, 0);
650    EmitXXStructorList(GV->getInitializer());
651
652    if (TM.getRelocationModel() == Reloc::Static &&
653        MAI->hasStaticCtorDtorReferenceInStaticMode()) {
654      StringRef Sym(".destructors_used");
655      OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
656                                      MCSA_Reference);
657    }
658    return true;
659  }
660
661  return false;
662}
663
664/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
665/// global in the specified llvm.used list for which emitUsedDirectiveFor
666/// is true, as being used with this directive.
667void AsmPrinter::EmitLLVMUsedList(Constant *List) {
668  // Should be an array of 'i8*'.
669  ConstantArray *InitList = dyn_cast<ConstantArray>(List);
670  if (InitList == 0) return;
671
672  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
673    const GlobalValue *GV =
674      dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
675    if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang))
676      OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(GV),
677                                      MCSA_NoDeadStrip);
678  }
679}
680
681/// EmitXXStructorList - Emit the ctor or dtor list.  This just prints out the
682/// function pointers, ignoring the init priority.
683void AsmPrinter::EmitXXStructorList(Constant *List) {
684  // Should be an array of '{ int, void ()* }' structs.  The first value is the
685  // init priority, which we ignore.
686  if (!isa<ConstantArray>(List)) return;
687  ConstantArray *InitList = cast<ConstantArray>(List);
688  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
689    if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
690      if (CS->getNumOperands() != 2) return;  // Not array of 2-element structs.
691
692      if (CS->getOperand(1)->isNullValue())
693        return;  // Found a null terminator, exit printing.
694      // Emit the function pointer.
695      EmitGlobalConstant(CS->getOperand(1));
696    }
697}
698
699//===--------------------------------------------------------------------===//
700// Emission and print routines
701//
702
703/// EmitInt8 - Emit a byte directive and value.
704///
705void AsmPrinter::EmitInt8(int Value) const {
706  OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/);
707}
708
709/// EmitInt16 - Emit a short directive and value.
710///
711void AsmPrinter::EmitInt16(int Value) const {
712  OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/);
713}
714
715/// EmitInt32 - Emit a long directive and value.
716///
717void AsmPrinter::EmitInt32(int Value) const {
718  OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/);
719}
720
721/// EmitInt64 - Emit a long long directive and value.
722///
723void AsmPrinter::EmitInt64(uint64_t Value) const {
724  OutStreamer.EmitIntValue(Value, 8, 0/*addrspace*/);
725}
726
727//===----------------------------------------------------------------------===//
728
729// EmitAlignment - Emit an alignment directive to the specified power of
730// two boundary.  For example, if you pass in 3 here, you will get an 8
731// byte alignment.  If a global value is specified, and if that global has
732// an explicit alignment requested, it will unconditionally override the
733// alignment request.  However, if ForcedAlignBits is specified, this value
734// has final say: the ultimate alignment will be the max of ForcedAlignBits
735// and the alignment computed with NumBits and the global.
736//
737// The algorithm is:
738//     Align = NumBits;
739//     if (GV && GV->hasalignment) Align = GV->getalignment();
740//     Align = std::max(Align, ForcedAlignBits);
741//
742void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
743                               unsigned ForcedAlignBits,
744                               bool UseFillExpr) const {
745  if (GV && GV->getAlignment())
746    NumBits = Log2_32(GV->getAlignment());
747  NumBits = std::max(NumBits, ForcedAlignBits);
748
749  if (NumBits == 0) return;   // No need to emit alignment.
750
751  unsigned FillValue = 0;
752  if (getCurrentSection()->getKind().isText())
753    FillValue = MAI->getTextAlignFillValue();
754
755  OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0);
756}
757
758/// LowerConstant - Lower the specified LLVM Constant to an MCExpr.
759///
760static const MCExpr *LowerConstant(const Constant *CV, AsmPrinter &AP) {
761  MCContext &Ctx = AP.OutContext;
762
763  if (CV->isNullValue() || isa<UndefValue>(CV))
764    return MCConstantExpr::Create(0, Ctx);
765
766  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
767    return MCConstantExpr::Create(CI->getZExtValue(), Ctx);
768
769  if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
770    return MCSymbolRefExpr::Create(AP.GetGlobalValueSymbol(GV), Ctx);
771  if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
772    return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx);
773
774  const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
775  if (CE == 0) {
776    llvm_unreachable("Unknown constant value to lower!");
777    return MCConstantExpr::Create(0, Ctx);
778  }
779
780  switch (CE->getOpcode()) {
781  case Instruction::ZExt:
782  case Instruction::SExt:
783  case Instruction::FPTrunc:
784  case Instruction::FPExt:
785  case Instruction::UIToFP:
786  case Instruction::SIToFP:
787  case Instruction::FPToUI:
788  case Instruction::FPToSI:
789  default: llvm_unreachable("FIXME: Don't support this constant cast expr");
790  case Instruction::GetElementPtr: {
791    const TargetData &TD = *AP.TM.getTargetData();
792    // Generate a symbolic expression for the byte address
793    const Constant *PtrVal = CE->getOperand(0);
794    SmallVector<Value*, 8> IdxVec(CE->op_begin()+1, CE->op_end());
795    int64_t Offset = TD.getIndexedOffset(PtrVal->getType(), &IdxVec[0],
796                                         IdxVec.size());
797
798    const MCExpr *Base = LowerConstant(CE->getOperand(0), AP);
799    if (Offset == 0)
800      return Base;
801
802    // Truncate/sext the offset to the pointer size.
803    if (TD.getPointerSizeInBits() != 64) {
804      int SExtAmount = 64-TD.getPointerSizeInBits();
805      Offset = (Offset << SExtAmount) >> SExtAmount;
806    }
807
808    return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx),
809                                   Ctx);
810  }
811
812  case Instruction::Trunc:
813    // We emit the value and depend on the assembler to truncate the generated
814    // expression properly.  This is important for differences between
815    // blockaddress labels.  Since the two labels are in the same function, it
816    // is reasonable to treat their delta as a 32-bit value.
817    // FALL THROUGH.
818  case Instruction::BitCast:
819    return LowerConstant(CE->getOperand(0), AP);
820
821  case Instruction::IntToPtr: {
822    const TargetData &TD = *AP.TM.getTargetData();
823    // Handle casts to pointers by changing them into casts to the appropriate
824    // integer type.  This promotes constant folding and simplifies this code.
825    Constant *Op = CE->getOperand(0);
826    Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()),
827                                      false/*ZExt*/);
828    return LowerConstant(Op, AP);
829  }
830
831  case Instruction::PtrToInt: {
832    const TargetData &TD = *AP.TM.getTargetData();
833    // Support only foldable casts to/from pointers that can be eliminated by
834    // changing the pointer to the appropriately sized integer type.
835    Constant *Op = CE->getOperand(0);
836    const Type *Ty = CE->getType();
837
838    const MCExpr *OpExpr = LowerConstant(Op, AP);
839
840    // We can emit the pointer value into this slot if the slot is an
841    // integer slot equal to the size of the pointer.
842    if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType()))
843      return OpExpr;
844
845    // Otherwise the pointer is smaller than the resultant integer, mask off
846    // the high bits so we are sure to get a proper truncation if the input is
847    // a constant expr.
848    unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType());
849    const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx);
850    return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx);
851  }
852
853  case Instruction::Add:
854  case Instruction::Sub:
855  case Instruction::And:
856  case Instruction::Or:
857  case Instruction::Xor: {
858    const MCExpr *LHS = LowerConstant(CE->getOperand(0), AP);
859    const MCExpr *RHS = LowerConstant(CE->getOperand(1), AP);
860    switch (CE->getOpcode()) {
861    default: llvm_unreachable("Unknown binary operator constant cast expr");
862    case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx);
863    case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx);
864    case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx);
865    case Instruction::Or:  return MCBinaryExpr::CreateOr (LHS, RHS, Ctx);
866    case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx);
867    }
868  }
869  }
870}
871
872static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace,
873                                    AsmPrinter &AP) {
874  if (AddrSpace != 0 || !CA->isString()) {
875    // Not a string.  Print the values in successive locations
876    for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
877      AP.EmitGlobalConstant(CA->getOperand(i), AddrSpace);
878    return;
879  }
880
881  // Otherwise, it can be emitted as .ascii.
882  SmallVector<char, 128> TmpVec;
883  TmpVec.reserve(CA->getNumOperands());
884  for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
885    TmpVec.push_back(cast<ConstantInt>(CA->getOperand(i))->getZExtValue());
886
887  AP.OutStreamer.EmitBytes(StringRef(TmpVec.data(), TmpVec.size()), AddrSpace);
888}
889
890static void EmitGlobalConstantVector(const ConstantVector *CV,
891                                     unsigned AddrSpace, AsmPrinter &AP) {
892  for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
893    AP.EmitGlobalConstant(CV->getOperand(i), AddrSpace);
894}
895
896static void EmitGlobalConstantStruct(const ConstantStruct *CS,
897                                     unsigned AddrSpace, AsmPrinter &AP) {
898  // Print the fields in successive locations. Pad to align if needed!
899  const TargetData *TD = AP.TM.getTargetData();
900  unsigned Size = TD->getTypeAllocSize(CS->getType());
901  const StructLayout *Layout = TD->getStructLayout(CS->getType());
902  uint64_t SizeSoFar = 0;
903  for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
904    const Constant *Field = CS->getOperand(i);
905
906    // Check if padding is needed and insert one or more 0s.
907    uint64_t FieldSize = TD->getTypeAllocSize(Field->getType());
908    uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
909                        - Layout->getElementOffset(i)) - FieldSize;
910    SizeSoFar += FieldSize + PadSize;
911
912    // Now print the actual field value.
913    AP.EmitGlobalConstant(Field, AddrSpace);
914
915    // Insert padding - this may include padding to increase the size of the
916    // current field up to the ABI size (if the struct is not packed) as well
917    // as padding to ensure that the next field starts at the right offset.
918    AP.OutStreamer.EmitZeros(PadSize, AddrSpace);
919  }
920  assert(SizeSoFar == Layout->getSizeInBytes() &&
921         "Layout of constant struct may be incorrect!");
922}
923
924static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace,
925                                 AsmPrinter &AP) {
926  // FP Constants are printed as integer constants to avoid losing
927  // precision.
928  if (CFP->getType()->isDoubleTy()) {
929    if (AP.VerboseAsm) {
930      double Val = CFP->getValueAPF().convertToDouble();
931      AP.OutStreamer.GetCommentOS() << "double " << Val << '\n';
932    }
933
934    uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
935    AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
936    return;
937  }
938
939  if (CFP->getType()->isFloatTy()) {
940    if (AP.VerboseAsm) {
941      float Val = CFP->getValueAPF().convertToFloat();
942      AP.OutStreamer.GetCommentOS() << "float " << Val << '\n';
943    }
944    uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
945    AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace);
946    return;
947  }
948
949  if (CFP->getType()->isX86_FP80Ty()) {
950    // all long double variants are printed as hex
951    // api needed to prevent premature destruction
952    APInt API = CFP->getValueAPF().bitcastToAPInt();
953    const uint64_t *p = API.getRawData();
954    if (AP.VerboseAsm) {
955      // Convert to double so we can print the approximate val as a comment.
956      APFloat DoubleVal = CFP->getValueAPF();
957      bool ignored;
958      DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
959                        &ignored);
960      AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= "
961        << DoubleVal.convertToDouble() << '\n';
962    }
963
964    if (AP.TM.getTargetData()->isBigEndian()) {
965      AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
966      AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
967    } else {
968      AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
969      AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
970    }
971
972    // Emit the tail padding for the long double.
973    const TargetData &TD = *AP.TM.getTargetData();
974    AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) -
975                             TD.getTypeStoreSize(CFP->getType()), AddrSpace);
976    return;
977  }
978
979  assert(CFP->getType()->isPPC_FP128Ty() &&
980         "Floating point constant type not handled");
981  // All long double variants are printed as hex api needed to prevent
982  // premature destruction.
983  APInt API = CFP->getValueAPF().bitcastToAPInt();
984  const uint64_t *p = API.getRawData();
985  if (AP.TM.getTargetData()->isBigEndian()) {
986    AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
987    AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
988  } else {
989    AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
990    AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
991  }
992}
993
994static void EmitGlobalConstantLargeInt(const ConstantInt *CI,
995                                       unsigned AddrSpace, AsmPrinter &AP) {
996  const TargetData *TD = AP.TM.getTargetData();
997  unsigned BitWidth = CI->getBitWidth();
998  assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
999
1000  // We don't expect assemblers to support integer data directives
1001  // for more than 64 bits, so we emit the data in at most 64-bit
1002  // quantities at a time.
1003  const uint64_t *RawData = CI->getValue().getRawData();
1004  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1005    uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i];
1006    AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1007  }
1008}
1009
1010/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1011void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1012  if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) {
1013    uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1014    return OutStreamer.EmitZeros(Size, AddrSpace);
1015  }
1016
1017  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1018    unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1019    switch (Size) {
1020    case 1:
1021    case 2:
1022    case 4:
1023    case 8:
1024      if (VerboseAsm)
1025        OutStreamer.GetCommentOS() << format("0x%llx\n", CI->getZExtValue());
1026      OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace);
1027      return;
1028    default:
1029      EmitGlobalConstantLargeInt(CI, AddrSpace, *this);
1030      return;
1031    }
1032  }
1033
1034  if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
1035    return EmitGlobalConstantArray(CVA, AddrSpace, *this);
1036
1037  if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
1038    return EmitGlobalConstantStruct(CVS, AddrSpace, *this);
1039
1040  if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
1041    return EmitGlobalConstantFP(CFP, AddrSpace, *this);
1042
1043  if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
1044    return EmitGlobalConstantVector(V, AddrSpace, *this);
1045
1046  if (isa<ConstantPointerNull>(CV)) {
1047    unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1048    OutStreamer.EmitIntValue(0, Size, AddrSpace);
1049    return;
1050  }
1051
1052  // Otherwise, it must be a ConstantExpr.  Lower it to an MCExpr, then emit it
1053  // thread the streamer with EmitValue.
1054  OutStreamer.EmitValue(LowerConstant(CV, *this),
1055                        TM.getTargetData()->getTypeAllocSize(CV->getType()),
1056                        AddrSpace);
1057}
1058
1059void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1060  // Target doesn't support this yet!
1061  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1062}
1063
1064/// PrintSpecial - Print information related to the specified machine instr
1065/// that is independent of the operand, and may be independent of the instr
1066/// itself.  This can be useful for portably encoding the comment character
1067/// or other bits of target-specific knowledge into the asmstrings.  The
1068/// syntax used is ${:comment}.  Targets can override this to add support
1069/// for their own strange codes.
1070void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1071  if (!strcmp(Code, "private")) {
1072    O << MAI->getPrivateGlobalPrefix();
1073  } else if (!strcmp(Code, "comment")) {
1074    if (VerboseAsm)
1075      O << MAI->getCommentString();
1076  } else if (!strcmp(Code, "uid")) {
1077    // Comparing the address of MI isn't sufficient, because machineinstrs may
1078    // be allocated to the same address across functions.
1079    const Function *ThisF = MI->getParent()->getParent()->getFunction();
1080
1081    // If this is a new LastFn instruction, bump the counter.
1082    if (LastMI != MI || LastFn != ThisF) {
1083      ++Counter;
1084      LastMI = MI;
1085      LastFn = ThisF;
1086    }
1087    O << Counter;
1088  } else {
1089    std::string msg;
1090    raw_string_ostream Msg(msg);
1091    Msg << "Unknown special formatter '" << Code
1092         << "' for machine instr: " << *MI;
1093    llvm_report_error(Msg.str());
1094  }
1095}
1096
1097/// processDebugLoc - Processes the debug information of each machine
1098/// instruction's DebugLoc.
1099void AsmPrinter::processDebugLoc(const MachineInstr *MI,
1100                                 bool BeforePrintingInsn) {
1101  if (!MAI || !DW || !MAI->doesSupportDebugInformation()
1102      || !DW->ShouldEmitDwarfDebug())
1103    return;
1104  DebugLoc DL = MI->getDebugLoc();
1105  if (DL.isUnknown())
1106    return;
1107  DILocation CurDLT = MF->getDILocation(DL);
1108  if (CurDLT.getScope().isNull())
1109    return;
1110
1111  if (!BeforePrintingInsn) {
1112    // After printing instruction
1113    DW->EndScope(MI);
1114  } else if (CurDLT.getNode() != PrevDLT) {
1115    unsigned L = DW->RecordSourceLine(CurDLT.getLineNumber(),
1116                                      CurDLT.getColumnNumber(),
1117                                      CurDLT.getScope().getNode());
1118    printLabel(L);
1119    O << '\n';
1120    DW->BeginScope(MI, L);
1121    PrevDLT = CurDLT.getNode();
1122  }
1123}
1124
1125
1126/// printInlineAsm - This method formats and prints the specified machine
1127/// instruction that is an inline asm.
1128void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1129  unsigned NumOperands = MI->getNumOperands();
1130
1131  // Count the number of register definitions.
1132  unsigned NumDefs = 0;
1133  for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1134       ++NumDefs)
1135    assert(NumDefs != NumOperands-1 && "No asm string?");
1136
1137  assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1138
1139  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1140  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1141
1142  O << '\t';
1143
1144  // If this asmstr is empty, just print the #APP/#NOAPP markers.
1145  // These are useful to see where empty asm's wound up.
1146  if (AsmStr[0] == 0) {
1147    O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1148    O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
1149    return;
1150  }
1151
1152  O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1153
1154  // The variant of the current asmprinter.
1155  int AsmPrinterVariant = MAI->getAssemblerDialect();
1156
1157  int CurVariant = -1;            // The number of the {.|.|.} region we are in.
1158  const char *LastEmitted = AsmStr; // One past the last character emitted.
1159
1160  while (*LastEmitted) {
1161    switch (*LastEmitted) {
1162    default: {
1163      // Not a special case, emit the string section literally.
1164      const char *LiteralEnd = LastEmitted+1;
1165      while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1166             *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1167        ++LiteralEnd;
1168      if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1169        O.write(LastEmitted, LiteralEnd-LastEmitted);
1170      LastEmitted = LiteralEnd;
1171      break;
1172    }
1173    case '\n':
1174      ++LastEmitted;   // Consume newline character.
1175      O << '\n';       // Indent code with newline.
1176      break;
1177    case '$': {
1178      ++LastEmitted;   // Consume '$' character.
1179      bool Done = true;
1180
1181      // Handle escapes.
1182      switch (*LastEmitted) {
1183      default: Done = false; break;
1184      case '$':     // $$ -> $
1185        if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1186          O << '$';
1187        ++LastEmitted;  // Consume second '$' character.
1188        break;
1189      case '(':             // $( -> same as GCC's { character.
1190        ++LastEmitted;      // Consume '(' character.
1191        if (CurVariant != -1) {
1192          llvm_report_error("Nested variants found in inline asm string: '"
1193                            + std::string(AsmStr) + "'");
1194        }
1195        CurVariant = 0;     // We're in the first variant now.
1196        break;
1197      case '|':
1198        ++LastEmitted;  // consume '|' character.
1199        if (CurVariant == -1)
1200          O << '|';       // this is gcc's behavior for | outside a variant
1201        else
1202          ++CurVariant;   // We're in the next variant.
1203        break;
1204      case ')':         // $) -> same as GCC's } char.
1205        ++LastEmitted;  // consume ')' character.
1206        if (CurVariant == -1)
1207          O << '}';     // this is gcc's behavior for } outside a variant
1208        else
1209          CurVariant = -1;
1210        break;
1211      }
1212      if (Done) break;
1213
1214      bool HasCurlyBraces = false;
1215      if (*LastEmitted == '{') {     // ${variable}
1216        ++LastEmitted;               // Consume '{' character.
1217        HasCurlyBraces = true;
1218      }
1219
1220      // If we have ${:foo}, then this is not a real operand reference, it is a
1221      // "magic" string reference, just like in .td files.  Arrange to call
1222      // PrintSpecial.
1223      if (HasCurlyBraces && *LastEmitted == ':') {
1224        ++LastEmitted;
1225        const char *StrStart = LastEmitted;
1226        const char *StrEnd = strchr(StrStart, '}');
1227        if (StrEnd == 0) {
1228          llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1229                            + std::string(AsmStr) + "'");
1230        }
1231
1232        std::string Val(StrStart, StrEnd);
1233        PrintSpecial(MI, Val.c_str());
1234        LastEmitted = StrEnd+1;
1235        break;
1236      }
1237
1238      const char *IDStart = LastEmitted;
1239      char *IDEnd;
1240      errno = 0;
1241      long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1242      if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1243        llvm_report_error("Bad $ operand number in inline asm string: '"
1244                          + std::string(AsmStr) + "'");
1245      }
1246      LastEmitted = IDEnd;
1247
1248      char Modifier[2] = { 0, 0 };
1249
1250      if (HasCurlyBraces) {
1251        // If we have curly braces, check for a modifier character.  This
1252        // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1253        if (*LastEmitted == ':') {
1254          ++LastEmitted;    // Consume ':' character.
1255          if (*LastEmitted == 0) {
1256            llvm_report_error("Bad ${:} expression in inline asm string: '"
1257                              + std::string(AsmStr) + "'");
1258          }
1259
1260          Modifier[0] = *LastEmitted;
1261          ++LastEmitted;    // Consume modifier character.
1262        }
1263
1264        if (*LastEmitted != '}') {
1265          llvm_report_error("Bad ${} expression in inline asm string: '"
1266                            + std::string(AsmStr) + "'");
1267        }
1268        ++LastEmitted;    // Consume '}' character.
1269      }
1270
1271      if ((unsigned)Val >= NumOperands-1) {
1272        llvm_report_error("Invalid $ operand number in inline asm string: '"
1273                          + std::string(AsmStr) + "'");
1274      }
1275
1276      // Okay, we finally have a value number.  Ask the target to print this
1277      // operand!
1278      if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1279        unsigned OpNo = 1;
1280
1281        bool Error = false;
1282
1283        // Scan to find the machine operand number for the operand.
1284        for (; Val; --Val) {
1285          if (OpNo >= MI->getNumOperands()) break;
1286          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1287          OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1288        }
1289
1290        if (OpNo >= MI->getNumOperands()) {
1291          Error = true;
1292        } else {
1293          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1294          ++OpNo;  // Skip over the ID number.
1295
1296          if (Modifier[0] == 'l')  // labels are target independent
1297            O << *MI->getOperand(OpNo).getMBB()->getSymbol(OutContext);
1298          else {
1299            AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1300            if ((OpFlags & 7) == 4) {
1301              Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1302                                                Modifier[0] ? Modifier : 0);
1303            } else {
1304              Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1305                                          Modifier[0] ? Modifier : 0);
1306            }
1307          }
1308        }
1309        if (Error) {
1310          std::string msg;
1311          raw_string_ostream Msg(msg);
1312          Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n";
1313          MI->print(Msg);
1314          llvm_report_error(Msg.str());
1315        }
1316      }
1317      break;
1318    }
1319    }
1320  }
1321  O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd();
1322}
1323
1324/// printImplicitDef - This method prints the specified machine instruction
1325/// that is an implicit def.
1326void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1327  if (!VerboseAsm) return;
1328  O.PadToColumn(MAI->getCommentColumn());
1329  O << MAI->getCommentString() << " implicit-def: "
1330    << TRI->getName(MI->getOperand(0).getReg());
1331}
1332
1333void AsmPrinter::printKill(const MachineInstr *MI) const {
1334  if (!VerboseAsm) return;
1335  O.PadToColumn(MAI->getCommentColumn());
1336  O << MAI->getCommentString() << " kill:";
1337  for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) {
1338    const MachineOperand &op = MI->getOperand(n);
1339    assert(op.isReg() && "KILL instruction must have only register operands");
1340    O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>");
1341  }
1342}
1343
1344/// printLabel - This method prints a local label used by debug and
1345/// exception handling tables.
1346void AsmPrinter::printLabel(const MachineInstr *MI) const {
1347  printLabel(MI->getOperand(0).getImm());
1348}
1349
1350void AsmPrinter::printLabel(unsigned Id) const {
1351  O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':';
1352}
1353
1354/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1355/// instruction, using the specified assembler variant.  Targets should
1356/// override this to format as appropriate.
1357bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1358                                 unsigned AsmVariant, const char *ExtraCode) {
1359  // Target doesn't support this yet!
1360  return true;
1361}
1362
1363bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1364                                       unsigned AsmVariant,
1365                                       const char *ExtraCode) {
1366  // Target doesn't support this yet!
1367  return true;
1368}
1369
1370MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA,
1371                                            const char *Suffix) const {
1372  return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock(), Suffix);
1373}
1374
1375MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F,
1376                                            const BasicBlock *BB,
1377                                            const char *Suffix) const {
1378  assert(BB->hasName() &&
1379         "Address of anonymous basic block not supported yet!");
1380
1381  // This code must use the function name itself, and not the function number,
1382  // since it must be possible to generate the label name from within other
1383  // functions.
1384  SmallString<60> FnName;
1385  Mang->getNameWithPrefix(FnName, F, false);
1386
1387  // FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME!
1388  SmallString<60> NameResult;
1389  Mang->getNameWithPrefix(NameResult,
1390                          StringRef("BA") + Twine((unsigned)FnName.size()) +
1391                          "_" + FnName.str() + "_" + BB->getName() + Suffix,
1392                          Mangler::Private);
1393
1394  return OutContext.GetOrCreateSymbol(NameResult.str());
1395}
1396
1397/// GetCPISymbol - Return the symbol for the specified constant pool entry.
1398MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
1399  SmallString<60> Name;
1400  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI"
1401    << getFunctionNumber() << '_' << CPID;
1402  return OutContext.GetOrCreateSymbol(Name.str());
1403}
1404
1405/// GetJTISymbol - Return the symbol for the specified jump table entry.
1406MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
1407  return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
1408}
1409
1410/// GetJTSetSymbol - Return the symbol for the specified jump table .set
1411/// FIXME: privatize to AsmPrinter.
1412MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
1413  SmallString<60> Name;
1414  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix()
1415    << getFunctionNumber() << '_' << UID << "_set_" << MBBID;
1416  return OutContext.GetOrCreateSymbol(Name.str());
1417}
1418
1419/// GetGlobalValueSymbol - Return the MCSymbol for the specified global
1420/// value.
1421MCSymbol *AsmPrinter::GetGlobalValueSymbol(const GlobalValue *GV) const {
1422  SmallString<60> NameStr;
1423  Mang->getNameWithPrefix(NameStr, GV, false);
1424  return OutContext.GetOrCreateSymbol(NameStr.str());
1425}
1426
1427/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
1428/// global value name as its base, with the specified suffix, and where the
1429/// symbol is forced to have private linkage if ForcePrivate is true.
1430MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
1431                                                   StringRef Suffix,
1432                                                   bool ForcePrivate) const {
1433  SmallString<60> NameStr;
1434  Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
1435  NameStr.append(Suffix.begin(), Suffix.end());
1436  return OutContext.GetOrCreateSymbol(NameStr.str());
1437}
1438
1439/// GetExternalSymbolSymbol - Return the MCSymbol for the specified
1440/// ExternalSymbol.
1441MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
1442  SmallString<60> NameStr;
1443  Mang->getNameWithPrefix(NameStr, Sym);
1444  return OutContext.GetOrCreateSymbol(NameStr.str());
1445}
1446
1447
1448
1449/// PrintParentLoopComment - Print comments about parent loops of this one.
1450static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1451                                   unsigned FunctionNumber) {
1452  if (Loop == 0) return;
1453  PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
1454  OS.indent(Loop->getLoopDepth()*2)
1455    << "Parent Loop BB" << FunctionNumber << "_"
1456    << Loop->getHeader()->getNumber()
1457    << " Depth=" << Loop->getLoopDepth() << '\n';
1458}
1459
1460
1461/// PrintChildLoopComment - Print comments about child loops within
1462/// the loop for this basic block, with nesting.
1463static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1464                                  unsigned FunctionNumber) {
1465  // Add child loop information
1466  for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
1467    OS.indent((*CL)->getLoopDepth()*2)
1468      << "Child Loop BB" << FunctionNumber << "_"
1469      << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
1470      << '\n';
1471    PrintChildLoopComment(OS, *CL, FunctionNumber);
1472  }
1473}
1474
1475/// EmitComments - Pretty-print comments for basic blocks.
1476static void PrintBasicBlockLoopComments(const MachineBasicBlock &MBB,
1477                                        const MachineLoopInfo *LI,
1478                                        const AsmPrinter &AP) {
1479  // Add loop depth information
1480  const MachineLoop *Loop = LI->getLoopFor(&MBB);
1481  if (Loop == 0) return;
1482
1483  MachineBasicBlock *Header = Loop->getHeader();
1484  assert(Header && "No header for loop");
1485
1486  // If this block is not a loop header, just print out what is the loop header
1487  // and return.
1488  if (Header != &MBB) {
1489    AP.OutStreamer.AddComment("  in Loop: Header=BB" +
1490                              Twine(AP.getFunctionNumber())+"_" +
1491                              Twine(Loop->getHeader()->getNumber())+
1492                              " Depth="+Twine(Loop->getLoopDepth()));
1493    return;
1494  }
1495
1496  // Otherwise, it is a loop header.  Print out information about child and
1497  // parent loops.
1498  raw_ostream &OS = AP.OutStreamer.GetCommentOS();
1499
1500  PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
1501
1502  OS << "=>";
1503  OS.indent(Loop->getLoopDepth()*2-2);
1504
1505  OS << "This ";
1506  if (Loop->empty())
1507    OS << "Inner ";
1508  OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
1509
1510  PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
1511}
1512
1513
1514/// EmitBasicBlockStart - This method prints the label for the specified
1515/// MachineBasicBlock, an alignment (if present) and a comment describing
1516/// it if appropriate.
1517void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
1518  // Emit an alignment directive for this block, if needed.
1519  if (unsigned Align = MBB->getAlignment())
1520    EmitAlignment(Log2_32(Align));
1521
1522  // If the block has its address taken, emit a special label to satisfy
1523  // references to the block. This is done so that we don't need to
1524  // remember the number of this label, and so that we can make
1525  // forward references to labels without knowing what their numbers
1526  // will be.
1527  if (MBB->hasAddressTaken()) {
1528    const BasicBlock *BB = MBB->getBasicBlock();
1529    if (VerboseAsm)
1530      OutStreamer.AddComment("Address Taken");
1531    OutStreamer.EmitLabel(GetBlockAddressSymbol(BB->getParent(), BB));
1532  }
1533
1534  // Print the main label for the block.
1535  if (MBB->pred_empty() || MBB->isOnlyReachableByFallthrough()) {
1536    if (VerboseAsm) {
1537      // NOTE: Want this comment at start of line.
1538      O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':';
1539      if (const BasicBlock *BB = MBB->getBasicBlock())
1540        if (BB->hasName())
1541          OutStreamer.AddComment("%" + BB->getName());
1542
1543      PrintBasicBlockLoopComments(*MBB, LI, *this);
1544      OutStreamer.AddBlankLine();
1545    }
1546  } else {
1547    if (VerboseAsm) {
1548      if (const BasicBlock *BB = MBB->getBasicBlock())
1549        if (BB->hasName())
1550          OutStreamer.AddComment("%" + BB->getName());
1551      PrintBasicBlockLoopComments(*MBB, LI, *this);
1552    }
1553
1554    OutStreamer.EmitLabel(MBB->getSymbol(OutContext));
1555  }
1556}
1557
1558void AsmPrinter::printVisibility(MCSymbol *Sym, unsigned Visibility) const {
1559  MCSymbolAttr Attr = MCSA_Invalid;
1560
1561  switch (Visibility) {
1562  default: break;
1563  case GlobalValue::HiddenVisibility:
1564    Attr = MAI->getHiddenVisibilityAttr();
1565    break;
1566  case GlobalValue::ProtectedVisibility:
1567    Attr = MAI->getProtectedVisibilityAttr();
1568    break;
1569  }
1570
1571  if (Attr != MCSA_Invalid)
1572    OutStreamer.EmitSymbolAttribute(Sym, Attr);
1573}
1574
1575void AsmPrinter::printOffset(int64_t Offset) const {
1576  if (Offset > 0)
1577    O << '+' << Offset;
1578  else if (Offset < 0)
1579    O << Offset;
1580}
1581
1582GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1583  if (!S->usesMetadata())
1584    return 0;
1585
1586  gcp_iterator GCPI = GCMetadataPrinters.find(S);
1587  if (GCPI != GCMetadataPrinters.end())
1588    return GCPI->second;
1589
1590  const char *Name = S->getName().c_str();
1591
1592  for (GCMetadataPrinterRegistry::iterator
1593         I = GCMetadataPrinterRegistry::begin(),
1594         E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1595    if (strcmp(Name, I->getName()) == 0) {
1596      GCMetadataPrinter *GMP = I->instantiate();
1597      GMP->S = S;
1598      GCMetadataPrinters.insert(std::make_pair(S, GMP));
1599      return GMP;
1600    }
1601
1602  llvm_report_error("no GCMetadataPrinter registered for GC: " + Twine(Name));
1603  return 0;
1604}
1605
1606/// EmitComments - Pretty-print comments for instructions
1607void AsmPrinter::EmitComments(const MachineInstr &MI) const {
1608  if (!VerboseAsm)
1609    return;
1610
1611  bool Newline = false;
1612
1613  if (!MI.getDebugLoc().isUnknown()) {
1614    DILocation DLT = MF->getDILocation(MI.getDebugLoc());
1615
1616    // Print source line info.
1617    O.PadToColumn(MAI->getCommentColumn());
1618    O << MAI->getCommentString() << ' ';
1619    DIScope Scope = DLT.getScope();
1620    // Omit the directory, because it's likely to be long and uninteresting.
1621    if (!Scope.isNull())
1622      O << Scope.getFilename();
1623    else
1624      O << "<unknown>";
1625    O << ':' << DLT.getLineNumber();
1626    if (DLT.getColumnNumber() != 0)
1627      O << ':' << DLT.getColumnNumber();
1628    Newline = true;
1629  }
1630
1631  // Check for spills and reloads
1632  int FI;
1633
1634  const MachineFrameInfo *FrameInfo =
1635    MI.getParent()->getParent()->getFrameInfo();
1636
1637  // We assume a single instruction only has a spill or reload, not
1638  // both.
1639  const MachineMemOperand *MMO;
1640  if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
1641    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1642      MMO = *MI.memoperands_begin();
1643      if (Newline) O << '\n';
1644      O.PadToColumn(MAI->getCommentColumn());
1645      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Reload";
1646      Newline = true;
1647    }
1648  }
1649  else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
1650    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1651      if (Newline) O << '\n';
1652      O.PadToColumn(MAI->getCommentColumn());
1653      O << MAI->getCommentString() << ' '
1654        << MMO->getSize() << "-byte Folded Reload";
1655      Newline = true;
1656    }
1657  }
1658  else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
1659    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1660      MMO = *MI.memoperands_begin();
1661      if (Newline) O << '\n';
1662      O.PadToColumn(MAI->getCommentColumn());
1663      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Spill";
1664      Newline = true;
1665    }
1666  }
1667  else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
1668    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1669      if (Newline) O << '\n';
1670      O.PadToColumn(MAI->getCommentColumn());
1671      O << MAI->getCommentString() << ' '
1672        << MMO->getSize() << "-byte Folded Spill";
1673      Newline = true;
1674    }
1675  }
1676
1677  // Check for spill-induced copies
1678  unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
1679  if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg,
1680                                      SrcSubIdx, DstSubIdx)) {
1681    if (MI.getAsmPrinterFlag(ReloadReuse)) {
1682      if (Newline) O << '\n';
1683      O.PadToColumn(MAI->getCommentColumn());
1684      O << MAI->getCommentString() << " Reload Reuse";
1685    }
1686  }
1687}
1688
1689