AsmPrinter.cpp revision e35df92eca194365f984f9d24a74e4ddd6669c40 
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->getSetDirective()) {
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      O << MAI->getSetDirective() << ' ' << *Name << ", " << *Target << '\n';
340    }
341  }
342
343  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
344  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
345  for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
346    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
347      MP->finishAssembly(O, *this, *MAI);
348
349  // If we don't have any trampolines, then we don't require stack memory
350  // to be executable. Some targets have a directive to declare this.
351  Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
352  if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
353    if (MCSection *S = MAI->getNonexecutableStackSection(OutContext))
354      OutStreamer.SwitchSection(S);
355
356  // Allow the target to emit any magic that it wants at the end of the file,
357  // after everything else has gone out.
358  EmitEndOfAsmFile(M);
359
360  delete Mang; Mang = 0;
361  DW = 0; MMI = 0;
362
363  OutStreamer.Finish();
364  return false;
365}
366
367void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
368  this->MF = &MF;
369  // Get the function symbol.
370  CurrentFnSym = GetGlobalValueSymbol(MF.getFunction());
371
372  if (VerboseAsm)
373    LI = &getAnalysis<MachineLoopInfo>();
374}
375
376namespace {
377  // SectionCPs - Keep track the alignment, constpool entries per Section.
378  struct SectionCPs {
379    const MCSection *S;
380    unsigned Alignment;
381    SmallVector<unsigned, 4> CPEs;
382    SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
383  };
384}
385
386/// EmitConstantPool - Print to the current output stream assembly
387/// representations of the constants in the constant pool MCP. This is
388/// used to print out constants which have been "spilled to memory" by
389/// the code generator.
390///
391void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
392  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
393  if (CP.empty()) return;
394
395  // Calculate sections for constant pool entries. We collect entries to go into
396  // the same section together to reduce amount of section switch statements.
397  SmallVector<SectionCPs, 4> CPSections;
398  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
399    const MachineConstantPoolEntry &CPE = CP[i];
400    unsigned Align = CPE.getAlignment();
401
402    SectionKind Kind;
403    switch (CPE.getRelocationInfo()) {
404    default: llvm_unreachable("Unknown section kind");
405    case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
406    case 1:
407      Kind = SectionKind::getReadOnlyWithRelLocal();
408      break;
409    case 0:
410    switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
411    case 4:  Kind = SectionKind::getMergeableConst4(); break;
412    case 8:  Kind = SectionKind::getMergeableConst8(); break;
413    case 16: Kind = SectionKind::getMergeableConst16();break;
414    default: Kind = SectionKind::getMergeableConst(); break;
415    }
416    }
417
418    const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
419
420    // The number of sections are small, just do a linear search from the
421    // last section to the first.
422    bool Found = false;
423    unsigned SecIdx = CPSections.size();
424    while (SecIdx != 0) {
425      if (CPSections[--SecIdx].S == S) {
426        Found = true;
427        break;
428      }
429    }
430    if (!Found) {
431      SecIdx = CPSections.size();
432      CPSections.push_back(SectionCPs(S, Align));
433    }
434
435    if (Align > CPSections[SecIdx].Alignment)
436      CPSections[SecIdx].Alignment = Align;
437    CPSections[SecIdx].CPEs.push_back(i);
438  }
439
440  // Now print stuff into the calculated sections.
441  for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
442    OutStreamer.SwitchSection(CPSections[i].S);
443    EmitAlignment(Log2_32(CPSections[i].Alignment));
444
445    unsigned Offset = 0;
446    for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
447      unsigned CPI = CPSections[i].CPEs[j];
448      MachineConstantPoolEntry CPE = CP[CPI];
449
450      // Emit inter-object padding for alignment.
451      unsigned AlignMask = CPE.getAlignment() - 1;
452      unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
453      OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/);
454
455      const Type *Ty = CPE.getType();
456      Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
457
458      // Emit the label with a comment on it.
459      if (VerboseAsm) {
460        OutStreamer.GetCommentOS() << "constant pool ";
461        WriteTypeSymbolic(OutStreamer.GetCommentOS(), CPE.getType(),
462                          MF->getFunction()->getParent());
463        OutStreamer.GetCommentOS() << '\n';
464      }
465      OutStreamer.EmitLabel(GetCPISymbol(CPI));
466
467      if (CPE.isMachineConstantPoolEntry())
468        EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
469      else
470        EmitGlobalConstant(CPE.Val.ConstVal);
471    }
472  }
473}
474
475/// EmitJumpTableInfo - Print assembly representations of the jump tables used
476/// by the current function to the current output stream.
477///
478void AsmPrinter::EmitJumpTableInfo(MachineFunction &MF) {
479  MachineJumpTableInfo *MJTI = MF.getJumpTableInfo();
480  if (MJTI == 0) return;
481  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
482  if (JT.empty()) return;
483
484  bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
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 (F->isWeakForLinker() ||
491      (IsPic && !TM.getTargetLowering()->usesGlobalOffsetTable())) {
492    // In PIC mode, we need to emit the jump table to the same section as the
493    // function body itself, otherwise the label differences won't make sense.
494    // We should also do if the section name is NULL or function is declared in
495    // discardable section.
496    OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang,
497                                                                    TM));
498  } else {
499    // Otherwise, drop it in the readonly section.
500    const MCSection *ReadOnlySection =
501      getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
502    OutStreamer.SwitchSection(ReadOnlySection);
503    JTInDiffSection = true;
504  }
505
506  EmitAlignment(Log2_32(MJTI->getEntryAlignment(*TM.getTargetData())));
507
508  for (unsigned i = 0, e = JT.size(); i != e; ++i) {
509    const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
510
511    // If this jump table was deleted, ignore it.
512    if (JTBBs.empty()) continue;
513
514    // For the EK_LabelDifference32 entry, if the target supports .set, emit a
515    // .set directive for each unique entry.  This reduces the number of
516    // relocations the assembler will generate for the jump table.
517    if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 &&
518        MAI->getSetDirective()) {
519      SmallPtrSet<MachineBasicBlock*, 16> EmittedSets;
520      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
521        if (EmittedSets.insert(JTBBs[ii]))
522          printPICJumpTableSetLabel(i, JTBBs[ii]);
523    }
524
525    // On some targets (e.g. Darwin) we want to emit two consequtive labels
526    // before each jump table.  The first label is never referenced, but tells
527    // the assembler and linker the extents of the jump table object.  The
528    // second label is actually referenced by the code.
529    if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0])
530      OutStreamer.EmitLabel(GetJTISymbol(i, true));
531
532    OutStreamer.EmitLabel(GetJTISymbol(i));
533
534    for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
535      EmitJumpTableEntry(MJTI, JTBBs[ii], i);
536  }
537}
538
539/// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
540/// current stream.
541void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
542                                    const MachineBasicBlock *MBB,
543                                    unsigned UID) const {
544  const MCExpr *Value = 0;
545  switch (MJTI->getEntryKind()) {
546  case MachineJumpTableInfo::EK_Custom32:
547    Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, UID,
548                                                              OutContext);
549    break;
550  case MachineJumpTableInfo::EK_BlockAddress:
551    // EK_BlockAddress - Each entry is a plain address of block, e.g.:
552    //     .word LBB123
553    Value = MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext);
554    break;
555  case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
556    // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
557    // with a relocation as gp-relative, e.g.:
558    //     .gprel32 LBB123
559    MCSymbol *MBBSym = MBB->getSymbol(OutContext);
560    OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
561    return;
562  }
563
564  case MachineJumpTableInfo::EK_LabelDifference32: {
565    // EK_LabelDifference32 - Each entry is the address of the block minus
566    // the address of the jump table.  This is used for PIC jump tables where
567    // gprel32 is not supported.  e.g.:
568    //      .word LBB123 - LJTI1_2
569    // If the .set directive is supported, this is emitted as:
570    //      .set L4_5_set_123, LBB123 - LJTI1_2
571    //      .word L4_5_set_123
572
573    // If we have emitted set directives for the jump table entries, print
574    // them rather than the entries themselves.  If we're emitting PIC, then
575    // emit the table entries as differences between two text section labels.
576    if (MAI->getSetDirective()) {
577      // If we used .set, reference the .set's symbol.
578      Value = MCSymbolRefExpr::Create(GetJTSetSymbol(UID, MBB->getNumber()),
579                                      OutContext);
580      break;
581    }
582    // Otherwise, use the difference as the jump table entry.
583    Value = MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext);
584    const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(UID), OutContext);
585    Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext);
586    break;
587  }
588  }
589
590  assert(Value && "Unknown entry kind!");
591
592  unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData());
593  OutStreamer.EmitValue(Value, EntrySize, /*addrspace*/0);
594}
595
596
597/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
598/// special global used by LLVM.  If so, emit it and return true, otherwise
599/// do nothing and return false.
600bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
601  if (GV->getName() == "llvm.used") {
602    if (MAI->hasNoDeadStrip())    // No need to emit this at all.
603      EmitLLVMUsedList(GV->getInitializer());
604    return true;
605  }
606
607  // Ignore debug and non-emitted data.  This handles llvm.compiler.used.
608  if (GV->getSection() == "llvm.metadata" ||
609      GV->hasAvailableExternallyLinkage())
610    return true;
611
612  if (!GV->hasAppendingLinkage()) return false;
613
614  assert(GV->hasInitializer() && "Not a special LLVM global!");
615
616  const TargetData *TD = TM.getTargetData();
617  unsigned Align = Log2_32(TD->getPointerPrefAlignment());
618  if (GV->getName() == "llvm.global_ctors") {
619    OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
620    EmitAlignment(Align, 0);
621    EmitXXStructorList(GV->getInitializer());
622
623    if (TM.getRelocationModel() == Reloc::Static &&
624        MAI->hasStaticCtorDtorReferenceInStaticMode()) {
625      StringRef Sym(".constructors_used");
626      OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
627                                      MCSA_Reference);
628    }
629    return true;
630  }
631
632  if (GV->getName() == "llvm.global_dtors") {
633    OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
634    EmitAlignment(Align, 0);
635    EmitXXStructorList(GV->getInitializer());
636
637    if (TM.getRelocationModel() == Reloc::Static &&
638        MAI->hasStaticCtorDtorReferenceInStaticMode()) {
639      StringRef Sym(".destructors_used");
640      OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
641                                      MCSA_Reference);
642    }
643    return true;
644  }
645
646  return false;
647}
648
649/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
650/// global in the specified llvm.used list for which emitUsedDirectiveFor
651/// is true, as being used with this directive.
652void AsmPrinter::EmitLLVMUsedList(Constant *List) {
653  // Should be an array of 'i8*'.
654  ConstantArray *InitList = dyn_cast<ConstantArray>(List);
655  if (InitList == 0) return;
656
657  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
658    const GlobalValue *GV =
659      dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
660    if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang))
661      OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(GV),
662                                      MCSA_NoDeadStrip);
663  }
664}
665
666/// EmitXXStructorList - Emit the ctor or dtor list.  This just prints out the
667/// function pointers, ignoring the init priority.
668void AsmPrinter::EmitXXStructorList(Constant *List) {
669  // Should be an array of '{ int, void ()* }' structs.  The first value is the
670  // init priority, which we ignore.
671  if (!isa<ConstantArray>(List)) return;
672  ConstantArray *InitList = cast<ConstantArray>(List);
673  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
674    if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
675      if (CS->getNumOperands() != 2) return;  // Not array of 2-element structs.
676
677      if (CS->getOperand(1)->isNullValue())
678        return;  // Found a null terminator, exit printing.
679      // Emit the function pointer.
680      EmitGlobalConstant(CS->getOperand(1));
681    }
682}
683
684//===--------------------------------------------------------------------===//
685// Emission and print routines
686//
687
688/// EmitInt8 - Emit a byte directive and value.
689///
690void AsmPrinter::EmitInt8(int Value) const {
691  OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/);
692}
693
694/// EmitInt16 - Emit a short directive and value.
695///
696void AsmPrinter::EmitInt16(int Value) const {
697  OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/);
698}
699
700/// EmitInt32 - Emit a long directive and value.
701///
702void AsmPrinter::EmitInt32(int Value) const {
703  OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/);
704}
705
706/// EmitInt64 - Emit a long long directive and value.
707///
708void AsmPrinter::EmitInt64(uint64_t Value) const {
709  OutStreamer.EmitIntValue(Value, 8, 0/*addrspace*/);
710}
711
712//===----------------------------------------------------------------------===//
713
714// EmitAlignment - Emit an alignment directive to the specified power of
715// two boundary.  For example, if you pass in 3 here, you will get an 8
716// byte alignment.  If a global value is specified, and if that global has
717// an explicit alignment requested, it will unconditionally override the
718// alignment request.  However, if ForcedAlignBits is specified, this value
719// has final say: the ultimate alignment will be the max of ForcedAlignBits
720// and the alignment computed with NumBits and the global.
721//
722// The algorithm is:
723//     Align = NumBits;
724//     if (GV && GV->hasalignment) Align = GV->getalignment();
725//     Align = std::max(Align, ForcedAlignBits);
726//
727void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
728                               unsigned ForcedAlignBits,
729                               bool UseFillExpr) const {
730  if (GV && GV->getAlignment())
731    NumBits = Log2_32(GV->getAlignment());
732  NumBits = std::max(NumBits, ForcedAlignBits);
733
734  if (NumBits == 0) return;   // No need to emit alignment.
735
736  unsigned FillValue = 0;
737  if (getCurrentSection()->getKind().isText())
738    FillValue = MAI->getTextAlignFillValue();
739
740  OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0);
741}
742
743/// LowerConstant - Lower the specified LLVM Constant to an MCExpr.
744///
745static const MCExpr *LowerConstant(const Constant *CV, AsmPrinter &AP) {
746  MCContext &Ctx = AP.OutContext;
747
748  if (CV->isNullValue() || isa<UndefValue>(CV))
749    return MCConstantExpr::Create(0, Ctx);
750
751  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
752    return MCConstantExpr::Create(CI->getZExtValue(), Ctx);
753
754  if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
755    return MCSymbolRefExpr::Create(AP.GetGlobalValueSymbol(GV), Ctx);
756  if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
757    return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx);
758
759  const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
760  if (CE == 0) {
761    llvm_unreachable("Unknown constant value to lower!");
762    return MCConstantExpr::Create(0, Ctx);
763  }
764
765  switch (CE->getOpcode()) {
766  case Instruction::ZExt:
767  case Instruction::SExt:
768  case Instruction::FPTrunc:
769  case Instruction::FPExt:
770  case Instruction::UIToFP:
771  case Instruction::SIToFP:
772  case Instruction::FPToUI:
773  case Instruction::FPToSI:
774  default: llvm_unreachable("FIXME: Don't support this constant cast expr");
775  case Instruction::GetElementPtr: {
776    const TargetData &TD = *AP.TM.getTargetData();
777    // Generate a symbolic expression for the byte address
778    const Constant *PtrVal = CE->getOperand(0);
779    SmallVector<Value*, 8> IdxVec(CE->op_begin()+1, CE->op_end());
780    int64_t Offset = TD.getIndexedOffset(PtrVal->getType(), &IdxVec[0],
781                                         IdxVec.size());
782
783    const MCExpr *Base = LowerConstant(CE->getOperand(0), AP);
784    if (Offset == 0)
785      return Base;
786
787    // Truncate/sext the offset to the pointer size.
788    if (TD.getPointerSizeInBits() != 64) {
789      int SExtAmount = 64-TD.getPointerSizeInBits();
790      Offset = (Offset << SExtAmount) >> SExtAmount;
791    }
792
793    return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx),
794                                   Ctx);
795  }
796
797  case Instruction::Trunc:
798    // We emit the value and depend on the assembler to truncate the generated
799    // expression properly.  This is important for differences between
800    // blockaddress labels.  Since the two labels are in the same function, it
801    // is reasonable to treat their delta as a 32-bit value.
802    // FALL THROUGH.
803  case Instruction::BitCast:
804    return LowerConstant(CE->getOperand(0), AP);
805
806  case Instruction::IntToPtr: {
807    const TargetData &TD = *AP.TM.getTargetData();
808    // Handle casts to pointers by changing them into casts to the appropriate
809    // integer type.  This promotes constant folding and simplifies this code.
810    Constant *Op = CE->getOperand(0);
811    Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()),
812                                      false/*ZExt*/);
813    return LowerConstant(Op, AP);
814  }
815
816  case Instruction::PtrToInt: {
817    const TargetData &TD = *AP.TM.getTargetData();
818    // Support only foldable casts to/from pointers that can be eliminated by
819    // changing the pointer to the appropriately sized integer type.
820    Constant *Op = CE->getOperand(0);
821    const Type *Ty = CE->getType();
822
823    const MCExpr *OpExpr = LowerConstant(Op, AP);
824
825    // We can emit the pointer value into this slot if the slot is an
826    // integer slot equal to the size of the pointer.
827    if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType()))
828      return OpExpr;
829
830    // Otherwise the pointer is smaller than the resultant integer, mask off
831    // the high bits so we are sure to get a proper truncation if the input is
832    // a constant expr.
833    unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType());
834    const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx);
835    return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx);
836  }
837
838  case Instruction::Add:
839  case Instruction::Sub:
840  case Instruction::And:
841  case Instruction::Or:
842  case Instruction::Xor: {
843    const MCExpr *LHS = LowerConstant(CE->getOperand(0), AP);
844    const MCExpr *RHS = LowerConstant(CE->getOperand(1), AP);
845    switch (CE->getOpcode()) {
846    default: llvm_unreachable("Unknown binary operator constant cast expr");
847    case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx);
848    case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx);
849    case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx);
850    case Instruction::Or:  return MCBinaryExpr::CreateOr (LHS, RHS, Ctx);
851    case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx);
852    }
853  }
854  }
855}
856
857static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace,
858                                    AsmPrinter &AP) {
859  if (AddrSpace != 0 || !CA->isString()) {
860    // Not a string.  Print the values in successive locations
861    for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
862      AP.EmitGlobalConstant(CA->getOperand(i), AddrSpace);
863    return;
864  }
865
866  // Otherwise, it can be emitted as .ascii.
867  SmallVector<char, 128> TmpVec;
868  TmpVec.reserve(CA->getNumOperands());
869  for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
870    TmpVec.push_back(cast<ConstantInt>(CA->getOperand(i))->getZExtValue());
871
872  AP.OutStreamer.EmitBytes(StringRef(TmpVec.data(), TmpVec.size()), AddrSpace);
873}
874
875static void EmitGlobalConstantVector(const ConstantVector *CV,
876                                     unsigned AddrSpace, AsmPrinter &AP) {
877  for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
878    AP.EmitGlobalConstant(CV->getOperand(i), AddrSpace);
879}
880
881static void EmitGlobalConstantStruct(const ConstantStruct *CS,
882                                     unsigned AddrSpace, AsmPrinter &AP) {
883  // Print the fields in successive locations. Pad to align if needed!
884  const TargetData *TD = AP.TM.getTargetData();
885  unsigned Size = TD->getTypeAllocSize(CS->getType());
886  const StructLayout *Layout = TD->getStructLayout(CS->getType());
887  uint64_t SizeSoFar = 0;
888  for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
889    const Constant *Field = CS->getOperand(i);
890
891    // Check if padding is needed and insert one or more 0s.
892    uint64_t FieldSize = TD->getTypeAllocSize(Field->getType());
893    uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
894                        - Layout->getElementOffset(i)) - FieldSize;
895    SizeSoFar += FieldSize + PadSize;
896
897    // Now print the actual field value.
898    AP.EmitGlobalConstant(Field, AddrSpace);
899
900    // Insert padding - this may include padding to increase the size of the
901    // current field up to the ABI size (if the struct is not packed) as well
902    // as padding to ensure that the next field starts at the right offset.
903    AP.OutStreamer.EmitZeros(PadSize, AddrSpace);
904  }
905  assert(SizeSoFar == Layout->getSizeInBytes() &&
906         "Layout of constant struct may be incorrect!");
907}
908
909static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace,
910                                 AsmPrinter &AP) {
911  // FP Constants are printed as integer constants to avoid losing
912  // precision.
913  if (CFP->getType()->isDoubleTy()) {
914    if (AP.VerboseAsm) {
915      double Val = CFP->getValueAPF().convertToDouble();
916      AP.OutStreamer.GetCommentOS() << "double " << Val << '\n';
917    }
918
919    uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
920    AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
921    return;
922  }
923
924  if (CFP->getType()->isFloatTy()) {
925    if (AP.VerboseAsm) {
926      float Val = CFP->getValueAPF().convertToFloat();
927      AP.OutStreamer.GetCommentOS() << "float " << Val << '\n';
928    }
929    uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
930    AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace);
931    return;
932  }
933
934  if (CFP->getType()->isX86_FP80Ty()) {
935    // all long double variants are printed as hex
936    // api needed to prevent premature destruction
937    APInt API = CFP->getValueAPF().bitcastToAPInt();
938    const uint64_t *p = API.getRawData();
939    if (AP.VerboseAsm) {
940      // Convert to double so we can print the approximate val as a comment.
941      APFloat DoubleVal = CFP->getValueAPF();
942      bool ignored;
943      DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
944                        &ignored);
945      AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= "
946        << DoubleVal.convertToDouble() << '\n';
947    }
948
949    if (AP.TM.getTargetData()->isBigEndian()) {
950      AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
951      AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
952    } else {
953      AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
954      AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
955    }
956
957    // Emit the tail padding for the long double.
958    const TargetData &TD = *AP.TM.getTargetData();
959    AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) -
960                             TD.getTypeStoreSize(CFP->getType()), AddrSpace);
961    return;
962  }
963
964  assert(CFP->getType()->isPPC_FP128Ty() &&
965         "Floating point constant type not handled");
966  // All long double variants are printed as hex api needed to prevent
967  // premature destruction.
968  APInt API = CFP->getValueAPF().bitcastToAPInt();
969  const uint64_t *p = API.getRawData();
970  if (AP.TM.getTargetData()->isBigEndian()) {
971    AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
972    AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
973  } else {
974    AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
975    AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
976  }
977}
978
979static void EmitGlobalConstantLargeInt(const ConstantInt *CI,
980                                       unsigned AddrSpace, AsmPrinter &AP) {
981  const TargetData *TD = AP.TM.getTargetData();
982  unsigned BitWidth = CI->getBitWidth();
983  assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
984
985  // We don't expect assemblers to support integer data directives
986  // for more than 64 bits, so we emit the data in at most 64-bit
987  // quantities at a time.
988  const uint64_t *RawData = CI->getValue().getRawData();
989  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
990    uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i];
991    AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
992  }
993}
994
995/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
996void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
997  if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) {
998    uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
999    return OutStreamer.EmitZeros(Size, AddrSpace);
1000  }
1001
1002  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1003    unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1004    switch (Size) {
1005    case 1:
1006    case 2:
1007    case 4:
1008    case 8:
1009      if (VerboseAsm)
1010        OutStreamer.GetCommentOS() << format("0x%llx\n", CI->getZExtValue());
1011      OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace);
1012      return;
1013    default:
1014      EmitGlobalConstantLargeInt(CI, AddrSpace, *this);
1015      return;
1016    }
1017  }
1018
1019  if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
1020    return EmitGlobalConstantArray(CVA, AddrSpace, *this);
1021
1022  if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
1023    return EmitGlobalConstantStruct(CVS, AddrSpace, *this);
1024
1025  if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
1026    return EmitGlobalConstantFP(CFP, AddrSpace, *this);
1027
1028  if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
1029    return EmitGlobalConstantVector(V, AddrSpace, *this);
1030
1031  if (isa<ConstantPointerNull>(CV)) {
1032    unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1033    OutStreamer.EmitIntValue(0, Size, AddrSpace);
1034    return;
1035  }
1036
1037  // Otherwise, it must be a ConstantExpr.  Lower it to an MCExpr, then emit it
1038  // thread the streamer with EmitValue.
1039  OutStreamer.EmitValue(LowerConstant(CV, *this),
1040                        TM.getTargetData()->getTypeAllocSize(CV->getType()),
1041                        AddrSpace);
1042}
1043
1044void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1045  // Target doesn't support this yet!
1046  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1047}
1048
1049/// PrintSpecial - Print information related to the specified machine instr
1050/// that is independent of the operand, and may be independent of the instr
1051/// itself.  This can be useful for portably encoding the comment character
1052/// or other bits of target-specific knowledge into the asmstrings.  The
1053/// syntax used is ${:comment}.  Targets can override this to add support
1054/// for their own strange codes.
1055void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1056  if (!strcmp(Code, "private")) {
1057    O << MAI->getPrivateGlobalPrefix();
1058  } else if (!strcmp(Code, "comment")) {
1059    if (VerboseAsm)
1060      O << MAI->getCommentString();
1061  } else if (!strcmp(Code, "uid")) {
1062    // Comparing the address of MI isn't sufficient, because machineinstrs may
1063    // be allocated to the same address across functions.
1064    const Function *ThisF = MI->getParent()->getParent()->getFunction();
1065
1066    // If this is a new LastFn instruction, bump the counter.
1067    if (LastMI != MI || LastFn != ThisF) {
1068      ++Counter;
1069      LastMI = MI;
1070      LastFn = ThisF;
1071    }
1072    O << Counter;
1073  } else {
1074    std::string msg;
1075    raw_string_ostream Msg(msg);
1076    Msg << "Unknown special formatter '" << Code
1077         << "' for machine instr: " << *MI;
1078    llvm_report_error(Msg.str());
1079  }
1080}
1081
1082/// processDebugLoc - Processes the debug information of each machine
1083/// instruction's DebugLoc.
1084void AsmPrinter::processDebugLoc(const MachineInstr *MI,
1085                                 bool BeforePrintingInsn) {
1086  if (!MAI || !DW || !MAI->doesSupportDebugInformation()
1087      || !DW->ShouldEmitDwarfDebug())
1088    return;
1089  DebugLoc DL = MI->getDebugLoc();
1090  if (DL.isUnknown())
1091    return;
1092  DILocation CurDLT = MF->getDILocation(DL);
1093  if (CurDLT.getScope().isNull())
1094    return;
1095
1096  if (!BeforePrintingInsn) {
1097    // After printing instruction
1098    DW->EndScope(MI);
1099  } else if (CurDLT.getNode() != PrevDLT) {
1100    unsigned L = DW->RecordSourceLine(CurDLT.getLineNumber(),
1101                                      CurDLT.getColumnNumber(),
1102                                      CurDLT.getScope().getNode());
1103    printLabel(L);
1104    O << '\n';
1105    DW->BeginScope(MI, L);
1106    PrevDLT = CurDLT.getNode();
1107  }
1108}
1109
1110
1111/// printInlineAsm - This method formats and prints the specified machine
1112/// instruction that is an inline asm.
1113void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1114  unsigned NumOperands = MI->getNumOperands();
1115
1116  // Count the number of register definitions.
1117  unsigned NumDefs = 0;
1118  for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1119       ++NumDefs)
1120    assert(NumDefs != NumOperands-1 && "No asm string?");
1121
1122  assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1123
1124  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1125  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1126
1127  O << '\t';
1128
1129  // If this asmstr is empty, just print the #APP/#NOAPP markers.
1130  // These are useful to see where empty asm's wound up.
1131  if (AsmStr[0] == 0) {
1132    O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1133    O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
1134    return;
1135  }
1136
1137  O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1138
1139  // The variant of the current asmprinter.
1140  int AsmPrinterVariant = MAI->getAssemblerDialect();
1141
1142  int CurVariant = -1;            // The number of the {.|.|.} region we are in.
1143  const char *LastEmitted = AsmStr; // One past the last character emitted.
1144
1145  while (*LastEmitted) {
1146    switch (*LastEmitted) {
1147    default: {
1148      // Not a special case, emit the string section literally.
1149      const char *LiteralEnd = LastEmitted+1;
1150      while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1151             *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1152        ++LiteralEnd;
1153      if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1154        O.write(LastEmitted, LiteralEnd-LastEmitted);
1155      LastEmitted = LiteralEnd;
1156      break;
1157    }
1158    case '\n':
1159      ++LastEmitted;   // Consume newline character.
1160      O << '\n';       // Indent code with newline.
1161      break;
1162    case '$': {
1163      ++LastEmitted;   // Consume '$' character.
1164      bool Done = true;
1165
1166      // Handle escapes.
1167      switch (*LastEmitted) {
1168      default: Done = false; break;
1169      case '$':     // $$ -> $
1170        if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1171          O << '$';
1172        ++LastEmitted;  // Consume second '$' character.
1173        break;
1174      case '(':             // $( -> same as GCC's { character.
1175        ++LastEmitted;      // Consume '(' character.
1176        if (CurVariant != -1) {
1177          llvm_report_error("Nested variants found in inline asm string: '"
1178                            + std::string(AsmStr) + "'");
1179        }
1180        CurVariant = 0;     // We're in the first variant now.
1181        break;
1182      case '|':
1183        ++LastEmitted;  // consume '|' character.
1184        if (CurVariant == -1)
1185          O << '|';       // this is gcc's behavior for | outside a variant
1186        else
1187          ++CurVariant;   // We're in the next variant.
1188        break;
1189      case ')':         // $) -> same as GCC's } char.
1190        ++LastEmitted;  // consume ')' character.
1191        if (CurVariant == -1)
1192          O << '}';     // this is gcc's behavior for } outside a variant
1193        else
1194          CurVariant = -1;
1195        break;
1196      }
1197      if (Done) break;
1198
1199      bool HasCurlyBraces = false;
1200      if (*LastEmitted == '{') {     // ${variable}
1201        ++LastEmitted;               // Consume '{' character.
1202        HasCurlyBraces = true;
1203      }
1204
1205      // If we have ${:foo}, then this is not a real operand reference, it is a
1206      // "magic" string reference, just like in .td files.  Arrange to call
1207      // PrintSpecial.
1208      if (HasCurlyBraces && *LastEmitted == ':') {
1209        ++LastEmitted;
1210        const char *StrStart = LastEmitted;
1211        const char *StrEnd = strchr(StrStart, '}');
1212        if (StrEnd == 0) {
1213          llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1214                            + std::string(AsmStr) + "'");
1215        }
1216
1217        std::string Val(StrStart, StrEnd);
1218        PrintSpecial(MI, Val.c_str());
1219        LastEmitted = StrEnd+1;
1220        break;
1221      }
1222
1223      const char *IDStart = LastEmitted;
1224      char *IDEnd;
1225      errno = 0;
1226      long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1227      if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1228        llvm_report_error("Bad $ operand number in inline asm string: '"
1229                          + std::string(AsmStr) + "'");
1230      }
1231      LastEmitted = IDEnd;
1232
1233      char Modifier[2] = { 0, 0 };
1234
1235      if (HasCurlyBraces) {
1236        // If we have curly braces, check for a modifier character.  This
1237        // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1238        if (*LastEmitted == ':') {
1239          ++LastEmitted;    // Consume ':' character.
1240          if (*LastEmitted == 0) {
1241            llvm_report_error("Bad ${:} expression in inline asm string: '"
1242                              + std::string(AsmStr) + "'");
1243          }
1244
1245          Modifier[0] = *LastEmitted;
1246          ++LastEmitted;    // Consume modifier character.
1247        }
1248
1249        if (*LastEmitted != '}') {
1250          llvm_report_error("Bad ${} expression in inline asm string: '"
1251                            + std::string(AsmStr) + "'");
1252        }
1253        ++LastEmitted;    // Consume '}' character.
1254      }
1255
1256      if ((unsigned)Val >= NumOperands-1) {
1257        llvm_report_error("Invalid $ operand number in inline asm string: '"
1258                          + std::string(AsmStr) + "'");
1259      }
1260
1261      // Okay, we finally have a value number.  Ask the target to print this
1262      // operand!
1263      if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1264        unsigned OpNo = 1;
1265
1266        bool Error = false;
1267
1268        // Scan to find the machine operand number for the operand.
1269        for (; Val; --Val) {
1270          if (OpNo >= MI->getNumOperands()) break;
1271          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1272          OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1273        }
1274
1275        if (OpNo >= MI->getNumOperands()) {
1276          Error = true;
1277        } else {
1278          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1279          ++OpNo;  // Skip over the ID number.
1280
1281          if (Modifier[0] == 'l')  // labels are target independent
1282            O << *MI->getOperand(OpNo).getMBB()->getSymbol(OutContext);
1283          else {
1284            AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1285            if ((OpFlags & 7) == 4) {
1286              Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1287                                                Modifier[0] ? Modifier : 0);
1288            } else {
1289              Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1290                                          Modifier[0] ? Modifier : 0);
1291            }
1292          }
1293        }
1294        if (Error) {
1295          std::string msg;
1296          raw_string_ostream Msg(msg);
1297          Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n";
1298          MI->print(Msg);
1299          llvm_report_error(Msg.str());
1300        }
1301      }
1302      break;
1303    }
1304    }
1305  }
1306  O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd();
1307}
1308
1309/// printImplicitDef - This method prints the specified machine instruction
1310/// that is an implicit def.
1311void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1312  if (!VerboseAsm) return;
1313  O.PadToColumn(MAI->getCommentColumn());
1314  O << MAI->getCommentString() << " implicit-def: "
1315    << TRI->getName(MI->getOperand(0).getReg());
1316}
1317
1318void AsmPrinter::printKill(const MachineInstr *MI) const {
1319  if (!VerboseAsm) return;
1320  O.PadToColumn(MAI->getCommentColumn());
1321  O << MAI->getCommentString() << " kill:";
1322  for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) {
1323    const MachineOperand &op = MI->getOperand(n);
1324    assert(op.isReg() && "KILL instruction must have only register operands");
1325    O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>");
1326  }
1327}
1328
1329/// printLabel - This method prints a local label used by debug and
1330/// exception handling tables.
1331void AsmPrinter::printLabel(const MachineInstr *MI) const {
1332  printLabel(MI->getOperand(0).getImm());
1333}
1334
1335void AsmPrinter::printLabel(unsigned Id) const {
1336  O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':';
1337}
1338
1339/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1340/// instruction, using the specified assembler variant.  Targets should
1341/// override this to format as appropriate.
1342bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1343                                 unsigned AsmVariant, const char *ExtraCode) {
1344  // Target doesn't support this yet!
1345  return true;
1346}
1347
1348bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1349                                       unsigned AsmVariant,
1350                                       const char *ExtraCode) {
1351  // Target doesn't support this yet!
1352  return true;
1353}
1354
1355MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA,
1356                                            const char *Suffix) const {
1357  return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock(), Suffix);
1358}
1359
1360MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F,
1361                                            const BasicBlock *BB,
1362                                            const char *Suffix) const {
1363  assert(BB->hasName() &&
1364         "Address of anonymous basic block not supported yet!");
1365
1366  // This code must use the function name itself, and not the function number,
1367  // since it must be possible to generate the label name from within other
1368  // functions.
1369  SmallString<60> FnName;
1370  Mang->getNameWithPrefix(FnName, F, false);
1371
1372  // FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME!
1373  SmallString<60> NameResult;
1374  Mang->getNameWithPrefix(NameResult,
1375                          StringRef("BA") + Twine((unsigned)FnName.size()) +
1376                          "_" + FnName.str() + "_" + BB->getName() + Suffix,
1377                          Mangler::Private);
1378
1379  return OutContext.GetOrCreateSymbol(NameResult.str());
1380}
1381
1382/// GetCPISymbol - Return the symbol for the specified constant pool entry.
1383MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
1384  SmallString<60> Name;
1385  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI"
1386    << getFunctionNumber() << '_' << CPID;
1387  return OutContext.GetOrCreateSymbol(Name.str());
1388}
1389
1390/// GetJTISymbol - Return the symbol for the specified jump table entry.
1391MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
1392  const char *Prefix = isLinkerPrivate ? MAI->getLinkerPrivateGlobalPrefix() :
1393                                         MAI->getPrivateGlobalPrefix();
1394  SmallString<60> Name;
1395  raw_svector_ostream(Name) << Prefix << "JTI" << getFunctionNumber() << '_'
1396    << JTID;
1397  return OutContext.GetOrCreateSymbol(Name.str());
1398}
1399
1400/// GetJTSetSymbol - Return the symbol for the specified jump table .set
1401/// FIXME: privatize to AsmPrinter.
1402MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
1403  SmallString<60> Name;
1404  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix()
1405    << getFunctionNumber() << '_' << UID << "_set_" << MBBID;
1406  return OutContext.GetOrCreateSymbol(Name.str());
1407}
1408
1409/// GetGlobalValueSymbol - Return the MCSymbol for the specified global
1410/// value.
1411MCSymbol *AsmPrinter::GetGlobalValueSymbol(const GlobalValue *GV) const {
1412  SmallString<60> NameStr;
1413  Mang->getNameWithPrefix(NameStr, GV, false);
1414  return OutContext.GetOrCreateSymbol(NameStr.str());
1415}
1416
1417/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
1418/// global value name as its base, with the specified suffix, and where the
1419/// symbol is forced to have private linkage if ForcePrivate is true.
1420MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
1421                                                   StringRef Suffix,
1422                                                   bool ForcePrivate) const {
1423  SmallString<60> NameStr;
1424  Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
1425  NameStr.append(Suffix.begin(), Suffix.end());
1426  return OutContext.GetOrCreateSymbol(NameStr.str());
1427}
1428
1429/// GetExternalSymbolSymbol - Return the MCSymbol for the specified
1430/// ExternalSymbol.
1431MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
1432  SmallString<60> NameStr;
1433  Mang->getNameWithPrefix(NameStr, Sym);
1434  return OutContext.GetOrCreateSymbol(NameStr.str());
1435}
1436
1437
1438
1439/// PrintParentLoopComment - Print comments about parent loops of this one.
1440static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1441                                   unsigned FunctionNumber) {
1442  if (Loop == 0) return;
1443  PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
1444  OS.indent(Loop->getLoopDepth()*2)
1445    << "Parent Loop BB" << FunctionNumber << "_"
1446    << Loop->getHeader()->getNumber()
1447    << " Depth=" << Loop->getLoopDepth() << '\n';
1448}
1449
1450
1451/// PrintChildLoopComment - Print comments about child loops within
1452/// the loop for this basic block, with nesting.
1453static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1454                                  unsigned FunctionNumber) {
1455  // Add child loop information
1456  for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
1457    OS.indent((*CL)->getLoopDepth()*2)
1458      << "Child Loop BB" << FunctionNumber << "_"
1459      << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
1460      << '\n';
1461    PrintChildLoopComment(OS, *CL, FunctionNumber);
1462  }
1463}
1464
1465/// EmitComments - Pretty-print comments for basic blocks.
1466static void PrintBasicBlockLoopComments(const MachineBasicBlock &MBB,
1467                                        const MachineLoopInfo *LI,
1468                                        const AsmPrinter &AP) {
1469  // Add loop depth information
1470  const MachineLoop *Loop = LI->getLoopFor(&MBB);
1471  if (Loop == 0) return;
1472
1473  MachineBasicBlock *Header = Loop->getHeader();
1474  assert(Header && "No header for loop");
1475
1476  // If this block is not a loop header, just print out what is the loop header
1477  // and return.
1478  if (Header != &MBB) {
1479    AP.OutStreamer.AddComment("  in Loop: Header=BB" +
1480                              Twine(AP.getFunctionNumber())+"_" +
1481                              Twine(Loop->getHeader()->getNumber())+
1482                              " Depth="+Twine(Loop->getLoopDepth()));
1483    return;
1484  }
1485
1486  // Otherwise, it is a loop header.  Print out information about child and
1487  // parent loops.
1488  raw_ostream &OS = AP.OutStreamer.GetCommentOS();
1489
1490  PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
1491
1492  OS << "=>";
1493  OS.indent(Loop->getLoopDepth()*2-2);
1494
1495  OS << "This ";
1496  if (Loop->empty())
1497    OS << "Inner ";
1498  OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
1499
1500  PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
1501}
1502
1503
1504/// EmitBasicBlockStart - This method prints the label for the specified
1505/// MachineBasicBlock, an alignment (if present) and a comment describing
1506/// it if appropriate.
1507void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
1508  // Emit an alignment directive for this block, if needed.
1509  if (unsigned Align = MBB->getAlignment())
1510    EmitAlignment(Log2_32(Align));
1511
1512  // If the block has its address taken, emit a special label to satisfy
1513  // references to the block. This is done so that we don't need to
1514  // remember the number of this label, and so that we can make
1515  // forward references to labels without knowing what their numbers
1516  // will be.
1517  if (MBB->hasAddressTaken()) {
1518    const BasicBlock *BB = MBB->getBasicBlock();
1519    if (VerboseAsm)
1520      OutStreamer.AddComment("Address Taken");
1521    OutStreamer.EmitLabel(GetBlockAddressSymbol(BB->getParent(), BB));
1522  }
1523
1524  // Print the main label for the block.
1525  if (MBB->pred_empty() || MBB->isOnlyReachableByFallthrough()) {
1526    if (VerboseAsm) {
1527      // NOTE: Want this comment at start of line.
1528      O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':';
1529      if (const BasicBlock *BB = MBB->getBasicBlock())
1530        if (BB->hasName())
1531          OutStreamer.AddComment("%" + BB->getName());
1532
1533      PrintBasicBlockLoopComments(*MBB, LI, *this);
1534      OutStreamer.AddBlankLine();
1535    }
1536  } else {
1537    if (VerboseAsm) {
1538      if (const BasicBlock *BB = MBB->getBasicBlock())
1539        if (BB->hasName())
1540          OutStreamer.AddComment("%" + BB->getName());
1541      PrintBasicBlockLoopComments(*MBB, LI, *this);
1542    }
1543
1544    OutStreamer.EmitLabel(MBB->getSymbol(OutContext));
1545  }
1546}
1547
1548/// printPICJumpTableSetLabel - This method prints a set label for the
1549/// specified MachineBasicBlock for a jumptable entry.
1550void AsmPrinter::printPICJumpTableSetLabel(unsigned uid,
1551                                           const MachineBasicBlock *MBB) const {
1552  if (!MAI->getSetDirective())
1553    return;
1554
1555  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1556    << *GetJTSetSymbol(uid, MBB->getNumber()) << ','
1557    << *MBB->getSymbol(OutContext) << '-' << *GetJTISymbol(uid) << '\n';
1558}
1559
1560void AsmPrinter::printVisibility(MCSymbol *Sym, unsigned Visibility) const {
1561  MCSymbolAttr Attr = MCSA_Invalid;
1562
1563  switch (Visibility) {
1564  default: break;
1565  case GlobalValue::HiddenVisibility:
1566    Attr = MAI->getHiddenVisibilityAttr();
1567    break;
1568  case GlobalValue::ProtectedVisibility:
1569    Attr = MAI->getProtectedVisibilityAttr();
1570    break;
1571  }
1572
1573  if (Attr != MCSA_Invalid)
1574    OutStreamer.EmitSymbolAttribute(Sym, Attr);
1575}
1576
1577void AsmPrinter::printOffset(int64_t Offset) const {
1578  if (Offset > 0)
1579    O << '+' << Offset;
1580  else if (Offset < 0)
1581    O << Offset;
1582}
1583
1584GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1585  if (!S->usesMetadata())
1586    return 0;
1587
1588  gcp_iterator GCPI = GCMetadataPrinters.find(S);
1589  if (GCPI != GCMetadataPrinters.end())
1590    return GCPI->second;
1591
1592  const char *Name = S->getName().c_str();
1593
1594  for (GCMetadataPrinterRegistry::iterator
1595         I = GCMetadataPrinterRegistry::begin(),
1596         E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1597    if (strcmp(Name, I->getName()) == 0) {
1598      GCMetadataPrinter *GMP = I->instantiate();
1599      GMP->S = S;
1600      GCMetadataPrinters.insert(std::make_pair(S, GMP));
1601      return GMP;
1602    }
1603
1604  llvm_report_error("no GCMetadataPrinter registered for GC: " + Twine(Name));
1605  return 0;
1606}
1607
1608/// EmitComments - Pretty-print comments for instructions
1609void AsmPrinter::EmitComments(const MachineInstr &MI) const {
1610  if (!VerboseAsm)
1611    return;
1612
1613  bool Newline = false;
1614
1615  if (!MI.getDebugLoc().isUnknown()) {
1616    DILocation DLT = MF->getDILocation(MI.getDebugLoc());
1617
1618    // Print source line info.
1619    O.PadToColumn(MAI->getCommentColumn());
1620    O << MAI->getCommentString() << ' ';
1621    DIScope Scope = DLT.getScope();
1622    // Omit the directory, because it's likely to be long and uninteresting.
1623    if (!Scope.isNull())
1624      O << Scope.getFilename();
1625    else
1626      O << "<unknown>";
1627    O << ':' << DLT.getLineNumber();
1628    if (DLT.getColumnNumber() != 0)
1629      O << ':' << DLT.getColumnNumber();
1630    Newline = true;
1631  }
1632
1633  // Check for spills and reloads
1634  int FI;
1635
1636  const MachineFrameInfo *FrameInfo =
1637    MI.getParent()->getParent()->getFrameInfo();
1638
1639  // We assume a single instruction only has a spill or reload, not
1640  // both.
1641  const MachineMemOperand *MMO;
1642  if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
1643    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1644      MMO = *MI.memoperands_begin();
1645      if (Newline) O << '\n';
1646      O.PadToColumn(MAI->getCommentColumn());
1647      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Reload";
1648      Newline = true;
1649    }
1650  }
1651  else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
1652    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1653      if (Newline) O << '\n';
1654      O.PadToColumn(MAI->getCommentColumn());
1655      O << MAI->getCommentString() << ' '
1656        << MMO->getSize() << "-byte Folded Reload";
1657      Newline = true;
1658    }
1659  }
1660  else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
1661    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1662      MMO = *MI.memoperands_begin();
1663      if (Newline) O << '\n';
1664      O.PadToColumn(MAI->getCommentColumn());
1665      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Spill";
1666      Newline = true;
1667    }
1668  }
1669  else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
1670    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1671      if (Newline) O << '\n';
1672      O.PadToColumn(MAI->getCommentColumn());
1673      O << MAI->getCommentString() << ' '
1674        << MMO->getSize() << "-byte Folded Spill";
1675      Newline = true;
1676    }
1677  }
1678
1679  // Check for spill-induced copies
1680  unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
1681  if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg,
1682                                      SrcSubIdx, DstSubIdx)) {
1683    if (MI.getAsmPrinterFlag(ReloadReuse)) {
1684      if (Newline) O << '\n';
1685      O.PadToColumn(MAI->getCommentColumn());
1686      O << MAI->getCommentString() << " Reload Reuse";
1687    }
1688  }
1689}
1690
1691