AsmPrinter.cpp revision f71cb015c1386ff8adc9ef0aa03fc0f0fc4a6e3e 
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  unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData());
507  EmitAlignment(Log2_32(MJTI->getEntryAlignment(*TM.getTargetData())));
508
509  for (unsigned i = 0, e = JT.size(); i != e; ++i) {
510    const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
511
512    // If this jump table was deleted, ignore it.
513    if (JTBBs.empty()) continue;
514
515    // For PIC codegen, if possible we want to use the SetDirective to reduce
516    // the number of relocations the assembler will generate for the jump table.
517    // Set directives are all printed before the jump table itself.
518    SmallPtrSet<MachineBasicBlock*, 16> EmittedSets;
519    if (MAI->getSetDirective() && IsPic)
520      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
521        if (EmittedSets.insert(JTBBs[ii]))
522          printPICJumpTableSetLabel(i, JTBBs[ii]);
523
524    // On some targets (e.g. Darwin) we want to emit two consequtive labels
525    // before each jump table.  The first label is never referenced, but tells
526    // the assembler and linker the extents of the jump table object.  The
527    // second label is actually referenced by the code.
528    if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0])
529      OutStreamer.EmitLabel(GetJTISymbol(i, true));
530
531    OutStreamer.EmitLabel(GetJTISymbol(i));
532
533    if (!IsPic) {
534      // In non-pic mode, the entries in the jump table are direct references
535      // to the basic blocks.
536      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
537        MCSymbol *MBBSym = JTBBs[ii]->getSymbol(OutContext);
538        OutStreamer.EmitValue(MCSymbolRefExpr::Create(MBBSym, OutContext),
539                              EntrySize, /*addrspace*/0);
540      }
541    } else {
542      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
543        printPICJumpTableEntry(MJTI, JTBBs[ii], i);
544    }
545  }
546}
547
548void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
549                                        const MachineBasicBlock *MBB,
550                                        unsigned uid) const {
551  const MCExpr *Value = 0;
552  switch (MJTI->getEntryKind()) {
553  case MachineJumpTableInfo::EK_Custom32:
554    Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, uid,
555                                                              OutContext);
556    break;
557  case MachineJumpTableInfo::EK_BlockAddress:
558    // EK_BlockAddress - Each entry is a plain address of block, e.g.:
559    //     .word LBB123
560    Value = MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext);
561    break;
562  case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
563    // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
564    // with a relocation as gp-relative, e.g.:
565    //     .gprel32 LBB123
566    MCSymbol *MBBSym = MBB->getSymbol(OutContext);
567    OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
568    return;
569  }
570
571  case MachineJumpTableInfo::EK_LabelDifference32: {
572    // EK_LabelDifference32 - Each entry is the address of the block minus
573    // the address of the jump table.  This is used for PIC jump tables where
574    // gprel32 is not supported.  e.g.:
575    //      .word LBB123 - LJTI1_2
576    // If the .set directive is supported, this is emitted as:
577    //      .set L4_5_set_123, LBB123 - LJTI1_2
578    //      .word L4_5_set_123
579
580    // If we have emitted set directives for the jump table entries, print
581    // them rather than the entries themselves.  If we're emitting PIC, then
582    // emit the table entries as differences between two text section labels.
583    if (MAI->getSetDirective()) {
584      // If we used .set, reference the .set's symbol.
585      Value = MCSymbolRefExpr::Create(GetJTSetSymbol(uid, MBB->getNumber()),
586                                      OutContext);
587      break;
588    }
589    // Otherwise, use the difference as the jump table entry.
590    Value = MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext);
591    const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(uid), OutContext);
592    Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext);
593    break;
594  }
595  }
596
597  assert(Value && "Unknown entry kind!");
598
599  unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData());
600  OutStreamer.EmitValue(Value, EntrySize, /*addrspace*/0);
601}
602
603
604/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
605/// special global used by LLVM.  If so, emit it and return true, otherwise
606/// do nothing and return false.
607bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
608  if (GV->getName() == "llvm.used") {
609    if (MAI->hasNoDeadStrip())    // No need to emit this at all.
610      EmitLLVMUsedList(GV->getInitializer());
611    return true;
612  }
613
614  // Ignore debug and non-emitted data.  This handles llvm.compiler.used.
615  if (GV->getSection() == "llvm.metadata" ||
616      GV->hasAvailableExternallyLinkage())
617    return true;
618
619  if (!GV->hasAppendingLinkage()) return false;
620
621  assert(GV->hasInitializer() && "Not a special LLVM global!");
622
623  const TargetData *TD = TM.getTargetData();
624  unsigned Align = Log2_32(TD->getPointerPrefAlignment());
625  if (GV->getName() == "llvm.global_ctors") {
626    OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
627    EmitAlignment(Align, 0);
628    EmitXXStructorList(GV->getInitializer());
629
630    if (TM.getRelocationModel() == Reloc::Static &&
631        MAI->hasStaticCtorDtorReferenceInStaticMode()) {
632      StringRef Sym(".constructors_used");
633      OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
634                                      MCSA_Reference);
635    }
636    return true;
637  }
638
639  if (GV->getName() == "llvm.global_dtors") {
640    OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
641    EmitAlignment(Align, 0);
642    EmitXXStructorList(GV->getInitializer());
643
644    if (TM.getRelocationModel() == Reloc::Static &&
645        MAI->hasStaticCtorDtorReferenceInStaticMode()) {
646      StringRef Sym(".destructors_used");
647      OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
648                                      MCSA_Reference);
649    }
650    return true;
651  }
652
653  return false;
654}
655
656/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
657/// global in the specified llvm.used list for which emitUsedDirectiveFor
658/// is true, as being used with this directive.
659void AsmPrinter::EmitLLVMUsedList(Constant *List) {
660  // Should be an array of 'i8*'.
661  ConstantArray *InitList = dyn_cast<ConstantArray>(List);
662  if (InitList == 0) return;
663
664  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
665    const GlobalValue *GV =
666      dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
667    if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang))
668      OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(GV),
669                                      MCSA_NoDeadStrip);
670  }
671}
672
673/// EmitXXStructorList - Emit the ctor or dtor list.  This just prints out the
674/// function pointers, ignoring the init priority.
675void AsmPrinter::EmitXXStructorList(Constant *List) {
676  // Should be an array of '{ int, void ()* }' structs.  The first value is the
677  // init priority, which we ignore.
678  if (!isa<ConstantArray>(List)) return;
679  ConstantArray *InitList = cast<ConstantArray>(List);
680  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
681    if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
682      if (CS->getNumOperands() != 2) return;  // Not array of 2-element structs.
683
684      if (CS->getOperand(1)->isNullValue())
685        return;  // Found a null terminator, exit printing.
686      // Emit the function pointer.
687      EmitGlobalConstant(CS->getOperand(1));
688    }
689}
690
691//===--------------------------------------------------------------------===//
692// Emission and print routines
693//
694
695/// EmitInt8 - Emit a byte directive and value.
696///
697void AsmPrinter::EmitInt8(int Value) const {
698  OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/);
699}
700
701/// EmitInt16 - Emit a short directive and value.
702///
703void AsmPrinter::EmitInt16(int Value) const {
704  OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/);
705}
706
707/// EmitInt32 - Emit a long directive and value.
708///
709void AsmPrinter::EmitInt32(int Value) const {
710  OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/);
711}
712
713/// EmitInt64 - Emit a long long directive and value.
714///
715void AsmPrinter::EmitInt64(uint64_t Value) const {
716  OutStreamer.EmitIntValue(Value, 8, 0/*addrspace*/);
717}
718
719//===----------------------------------------------------------------------===//
720
721// EmitAlignment - Emit an alignment directive to the specified power of
722// two boundary.  For example, if you pass in 3 here, you will get an 8
723// byte alignment.  If a global value is specified, and if that global has
724// an explicit alignment requested, it will unconditionally override the
725// alignment request.  However, if ForcedAlignBits is specified, this value
726// has final say: the ultimate alignment will be the max of ForcedAlignBits
727// and the alignment computed with NumBits and the global.
728//
729// The algorithm is:
730//     Align = NumBits;
731//     if (GV && GV->hasalignment) Align = GV->getalignment();
732//     Align = std::max(Align, ForcedAlignBits);
733//
734void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
735                               unsigned ForcedAlignBits,
736                               bool UseFillExpr) const {
737  if (GV && GV->getAlignment())
738    NumBits = Log2_32(GV->getAlignment());
739  NumBits = std::max(NumBits, ForcedAlignBits);
740
741  if (NumBits == 0) return;   // No need to emit alignment.
742
743  unsigned FillValue = 0;
744  if (getCurrentSection()->getKind().isText())
745    FillValue = MAI->getTextAlignFillValue();
746
747  OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0);
748}
749
750/// LowerConstant - Lower the specified LLVM Constant to an MCExpr.
751///
752static const MCExpr *LowerConstant(const Constant *CV, AsmPrinter &AP) {
753  MCContext &Ctx = AP.OutContext;
754
755  if (CV->isNullValue() || isa<UndefValue>(CV))
756    return MCConstantExpr::Create(0, Ctx);
757
758  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
759    return MCConstantExpr::Create(CI->getZExtValue(), Ctx);
760
761  if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
762    return MCSymbolRefExpr::Create(AP.GetGlobalValueSymbol(GV), Ctx);
763  if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
764    return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx);
765
766  const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
767  if (CE == 0) {
768    llvm_unreachable("Unknown constant value to lower!");
769    return MCConstantExpr::Create(0, Ctx);
770  }
771
772  switch (CE->getOpcode()) {
773  case Instruction::ZExt:
774  case Instruction::SExt:
775  case Instruction::FPTrunc:
776  case Instruction::FPExt:
777  case Instruction::UIToFP:
778  case Instruction::SIToFP:
779  case Instruction::FPToUI:
780  case Instruction::FPToSI:
781  default: llvm_unreachable("FIXME: Don't support this constant cast expr");
782  case Instruction::GetElementPtr: {
783    const TargetData &TD = *AP.TM.getTargetData();
784    // Generate a symbolic expression for the byte address
785    const Constant *PtrVal = CE->getOperand(0);
786    SmallVector<Value*, 8> IdxVec(CE->op_begin()+1, CE->op_end());
787    int64_t Offset = TD.getIndexedOffset(PtrVal->getType(), &IdxVec[0],
788                                         IdxVec.size());
789
790    const MCExpr *Base = LowerConstant(CE->getOperand(0), AP);
791    if (Offset == 0)
792      return Base;
793
794    // Truncate/sext the offset to the pointer size.
795    if (TD.getPointerSizeInBits() != 64) {
796      int SExtAmount = 64-TD.getPointerSizeInBits();
797      Offset = (Offset << SExtAmount) >> SExtAmount;
798    }
799
800    return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx),
801                                   Ctx);
802  }
803
804  case Instruction::Trunc:
805    // We emit the value and depend on the assembler to truncate the generated
806    // expression properly.  This is important for differences between
807    // blockaddress labels.  Since the two labels are in the same function, it
808    // is reasonable to treat their delta as a 32-bit value.
809    // FALL THROUGH.
810  case Instruction::BitCast:
811    return LowerConstant(CE->getOperand(0), AP);
812
813  case Instruction::IntToPtr: {
814    const TargetData &TD = *AP.TM.getTargetData();
815    // Handle casts to pointers by changing them into casts to the appropriate
816    // integer type.  This promotes constant folding and simplifies this code.
817    Constant *Op = CE->getOperand(0);
818    Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()),
819                                      false/*ZExt*/);
820    return LowerConstant(Op, AP);
821  }
822
823  case Instruction::PtrToInt: {
824    const TargetData &TD = *AP.TM.getTargetData();
825    // Support only foldable casts to/from pointers that can be eliminated by
826    // changing the pointer to the appropriately sized integer type.
827    Constant *Op = CE->getOperand(0);
828    const Type *Ty = CE->getType();
829
830    const MCExpr *OpExpr = LowerConstant(Op, AP);
831
832    // We can emit the pointer value into this slot if the slot is an
833    // integer slot equal to the size of the pointer.
834    if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType()))
835      return OpExpr;
836
837    // Otherwise the pointer is smaller than the resultant integer, mask off
838    // the high bits so we are sure to get a proper truncation if the input is
839    // a constant expr.
840    unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType());
841    const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx);
842    return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx);
843  }
844
845  case Instruction::Add:
846  case Instruction::Sub:
847  case Instruction::And:
848  case Instruction::Or:
849  case Instruction::Xor: {
850    const MCExpr *LHS = LowerConstant(CE->getOperand(0), AP);
851    const MCExpr *RHS = LowerConstant(CE->getOperand(1), AP);
852    switch (CE->getOpcode()) {
853    default: llvm_unreachable("Unknown binary operator constant cast expr");
854    case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx);
855    case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx);
856    case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx);
857    case Instruction::Or:  return MCBinaryExpr::CreateOr (LHS, RHS, Ctx);
858    case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx);
859    }
860  }
861  }
862}
863
864static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace,
865                                    AsmPrinter &AP) {
866  if (AddrSpace != 0 || !CA->isString()) {
867    // Not a string.  Print the values in successive locations
868    for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
869      AP.EmitGlobalConstant(CA->getOperand(i), AddrSpace);
870    return;
871  }
872
873  // Otherwise, it can be emitted as .ascii.
874  SmallVector<char, 128> TmpVec;
875  TmpVec.reserve(CA->getNumOperands());
876  for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
877    TmpVec.push_back(cast<ConstantInt>(CA->getOperand(i))->getZExtValue());
878
879  AP.OutStreamer.EmitBytes(StringRef(TmpVec.data(), TmpVec.size()), AddrSpace);
880}
881
882static void EmitGlobalConstantVector(const ConstantVector *CV,
883                                     unsigned AddrSpace, AsmPrinter &AP) {
884  for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
885    AP.EmitGlobalConstant(CV->getOperand(i), AddrSpace);
886}
887
888static void EmitGlobalConstantStruct(const ConstantStruct *CS,
889                                     unsigned AddrSpace, AsmPrinter &AP) {
890  // Print the fields in successive locations. Pad to align if needed!
891  const TargetData *TD = AP.TM.getTargetData();
892  unsigned Size = TD->getTypeAllocSize(CS->getType());
893  const StructLayout *Layout = TD->getStructLayout(CS->getType());
894  uint64_t SizeSoFar = 0;
895  for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
896    const Constant *Field = CS->getOperand(i);
897
898    // Check if padding is needed and insert one or more 0s.
899    uint64_t FieldSize = TD->getTypeAllocSize(Field->getType());
900    uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
901                        - Layout->getElementOffset(i)) - FieldSize;
902    SizeSoFar += FieldSize + PadSize;
903
904    // Now print the actual field value.
905    AP.EmitGlobalConstant(Field, AddrSpace);
906
907    // Insert padding - this may include padding to increase the size of the
908    // current field up to the ABI size (if the struct is not packed) as well
909    // as padding to ensure that the next field starts at the right offset.
910    AP.OutStreamer.EmitZeros(PadSize, AddrSpace);
911  }
912  assert(SizeSoFar == Layout->getSizeInBytes() &&
913         "Layout of constant struct may be incorrect!");
914}
915
916static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace,
917                                 AsmPrinter &AP) {
918  // FP Constants are printed as integer constants to avoid losing
919  // precision.
920  if (CFP->getType()->isDoubleTy()) {
921    if (AP.VerboseAsm) {
922      double Val = CFP->getValueAPF().convertToDouble();
923      AP.OutStreamer.GetCommentOS() << "double " << Val << '\n';
924    }
925
926    uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
927    AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
928    return;
929  }
930
931  if (CFP->getType()->isFloatTy()) {
932    if (AP.VerboseAsm) {
933      float Val = CFP->getValueAPF().convertToFloat();
934      AP.OutStreamer.GetCommentOS() << "float " << Val << '\n';
935    }
936    uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
937    AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace);
938    return;
939  }
940
941  if (CFP->getType()->isX86_FP80Ty()) {
942    // all long double variants are printed as hex
943    // api needed to prevent premature destruction
944    APInt API = CFP->getValueAPF().bitcastToAPInt();
945    const uint64_t *p = API.getRawData();
946    if (AP.VerboseAsm) {
947      // Convert to double so we can print the approximate val as a comment.
948      APFloat DoubleVal = CFP->getValueAPF();
949      bool ignored;
950      DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
951                        &ignored);
952      AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= "
953        << DoubleVal.convertToDouble() << '\n';
954    }
955
956    if (AP.TM.getTargetData()->isBigEndian()) {
957      AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
958      AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
959    } else {
960      AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
961      AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
962    }
963
964    // Emit the tail padding for the long double.
965    const TargetData &TD = *AP.TM.getTargetData();
966    AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) -
967                             TD.getTypeStoreSize(CFP->getType()), AddrSpace);
968    return;
969  }
970
971  assert(CFP->getType()->isPPC_FP128Ty() &&
972         "Floating point constant type not handled");
973  // All long double variants are printed as hex api needed to prevent
974  // premature destruction.
975  APInt API = CFP->getValueAPF().bitcastToAPInt();
976  const uint64_t *p = API.getRawData();
977  if (AP.TM.getTargetData()->isBigEndian()) {
978    AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
979    AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
980  } else {
981    AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
982    AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
983  }
984}
985
986static void EmitGlobalConstantLargeInt(const ConstantInt *CI,
987                                       unsigned AddrSpace, AsmPrinter &AP) {
988  const TargetData *TD = AP.TM.getTargetData();
989  unsigned BitWidth = CI->getBitWidth();
990  assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
991
992  // We don't expect assemblers to support integer data directives
993  // for more than 64 bits, so we emit the data in at most 64-bit
994  // quantities at a time.
995  const uint64_t *RawData = CI->getValue().getRawData();
996  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
997    uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i];
998    AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
999  }
1000}
1001
1002/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1003void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1004  if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) {
1005    uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1006    return OutStreamer.EmitZeros(Size, AddrSpace);
1007  }
1008
1009  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1010    unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1011    switch (Size) {
1012    case 1:
1013    case 2:
1014    case 4:
1015    case 8:
1016      if (VerboseAsm)
1017        OutStreamer.GetCommentOS() << format("0x%llx\n", CI->getZExtValue());
1018      OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace);
1019      return;
1020    default:
1021      EmitGlobalConstantLargeInt(CI, AddrSpace, *this);
1022      return;
1023    }
1024  }
1025
1026  if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
1027    return EmitGlobalConstantArray(CVA, AddrSpace, *this);
1028
1029  if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
1030    return EmitGlobalConstantStruct(CVS, AddrSpace, *this);
1031
1032  if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
1033    return EmitGlobalConstantFP(CFP, AddrSpace, *this);
1034
1035  if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
1036    return EmitGlobalConstantVector(V, AddrSpace, *this);
1037
1038  if (isa<ConstantPointerNull>(CV)) {
1039    unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1040    OutStreamer.EmitIntValue(0, Size, AddrSpace);
1041    return;
1042  }
1043
1044  // Otherwise, it must be a ConstantExpr.  Lower it to an MCExpr, then emit it
1045  // thread the streamer with EmitValue.
1046  OutStreamer.EmitValue(LowerConstant(CV, *this),
1047                        TM.getTargetData()->getTypeAllocSize(CV->getType()),
1048                        AddrSpace);
1049}
1050
1051void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1052  // Target doesn't support this yet!
1053  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1054}
1055
1056/// PrintSpecial - Print information related to the specified machine instr
1057/// that is independent of the operand, and may be independent of the instr
1058/// itself.  This can be useful for portably encoding the comment character
1059/// or other bits of target-specific knowledge into the asmstrings.  The
1060/// syntax used is ${:comment}.  Targets can override this to add support
1061/// for their own strange codes.
1062void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1063  if (!strcmp(Code, "private")) {
1064    O << MAI->getPrivateGlobalPrefix();
1065  } else if (!strcmp(Code, "comment")) {
1066    if (VerboseAsm)
1067      O << MAI->getCommentString();
1068  } else if (!strcmp(Code, "uid")) {
1069    // Comparing the address of MI isn't sufficient, because machineinstrs may
1070    // be allocated to the same address across functions.
1071    const Function *ThisF = MI->getParent()->getParent()->getFunction();
1072
1073    // If this is a new LastFn instruction, bump the counter.
1074    if (LastMI != MI || LastFn != ThisF) {
1075      ++Counter;
1076      LastMI = MI;
1077      LastFn = ThisF;
1078    }
1079    O << Counter;
1080  } else {
1081    std::string msg;
1082    raw_string_ostream Msg(msg);
1083    Msg << "Unknown special formatter '" << Code
1084         << "' for machine instr: " << *MI;
1085    llvm_report_error(Msg.str());
1086  }
1087}
1088
1089/// processDebugLoc - Processes the debug information of each machine
1090/// instruction's DebugLoc.
1091void AsmPrinter::processDebugLoc(const MachineInstr *MI,
1092                                 bool BeforePrintingInsn) {
1093  if (!MAI || !DW || !MAI->doesSupportDebugInformation()
1094      || !DW->ShouldEmitDwarfDebug())
1095    return;
1096  DebugLoc DL = MI->getDebugLoc();
1097  if (DL.isUnknown())
1098    return;
1099  DILocation CurDLT = MF->getDILocation(DL);
1100  if (CurDLT.getScope().isNull())
1101    return;
1102
1103  if (!BeforePrintingInsn) {
1104    // After printing instruction
1105    DW->EndScope(MI);
1106  } else if (CurDLT.getNode() != PrevDLT) {
1107    unsigned L = DW->RecordSourceLine(CurDLT.getLineNumber(),
1108                                      CurDLT.getColumnNumber(),
1109                                      CurDLT.getScope().getNode());
1110    printLabel(L);
1111    O << '\n';
1112    DW->BeginScope(MI, L);
1113    PrevDLT = CurDLT.getNode();
1114  }
1115}
1116
1117
1118/// printInlineAsm - This method formats and prints the specified machine
1119/// instruction that is an inline asm.
1120void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1121  unsigned NumOperands = MI->getNumOperands();
1122
1123  // Count the number of register definitions.
1124  unsigned NumDefs = 0;
1125  for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1126       ++NumDefs)
1127    assert(NumDefs != NumOperands-1 && "No asm string?");
1128
1129  assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1130
1131  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1132  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1133
1134  O << '\t';
1135
1136  // If this asmstr is empty, just print the #APP/#NOAPP markers.
1137  // These are useful to see where empty asm's wound up.
1138  if (AsmStr[0] == 0) {
1139    O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1140    O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
1141    return;
1142  }
1143
1144  O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1145
1146  // The variant of the current asmprinter.
1147  int AsmPrinterVariant = MAI->getAssemblerDialect();
1148
1149  int CurVariant = -1;            // The number of the {.|.|.} region we are in.
1150  const char *LastEmitted = AsmStr; // One past the last character emitted.
1151
1152  while (*LastEmitted) {
1153    switch (*LastEmitted) {
1154    default: {
1155      // Not a special case, emit the string section literally.
1156      const char *LiteralEnd = LastEmitted+1;
1157      while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1158             *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1159        ++LiteralEnd;
1160      if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1161        O.write(LastEmitted, LiteralEnd-LastEmitted);
1162      LastEmitted = LiteralEnd;
1163      break;
1164    }
1165    case '\n':
1166      ++LastEmitted;   // Consume newline character.
1167      O << '\n';       // Indent code with newline.
1168      break;
1169    case '$': {
1170      ++LastEmitted;   // Consume '$' character.
1171      bool Done = true;
1172
1173      // Handle escapes.
1174      switch (*LastEmitted) {
1175      default: Done = false; break;
1176      case '$':     // $$ -> $
1177        if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1178          O << '$';
1179        ++LastEmitted;  // Consume second '$' character.
1180        break;
1181      case '(':             // $( -> same as GCC's { character.
1182        ++LastEmitted;      // Consume '(' character.
1183        if (CurVariant != -1) {
1184          llvm_report_error("Nested variants found in inline asm string: '"
1185                            + std::string(AsmStr) + "'");
1186        }
1187        CurVariant = 0;     // We're in the first variant now.
1188        break;
1189      case '|':
1190        ++LastEmitted;  // consume '|' character.
1191        if (CurVariant == -1)
1192          O << '|';       // this is gcc's behavior for | outside a variant
1193        else
1194          ++CurVariant;   // We're in the next variant.
1195        break;
1196      case ')':         // $) -> same as GCC's } char.
1197        ++LastEmitted;  // consume ')' character.
1198        if (CurVariant == -1)
1199          O << '}';     // this is gcc's behavior for } outside a variant
1200        else
1201          CurVariant = -1;
1202        break;
1203      }
1204      if (Done) break;
1205
1206      bool HasCurlyBraces = false;
1207      if (*LastEmitted == '{') {     // ${variable}
1208        ++LastEmitted;               // Consume '{' character.
1209        HasCurlyBraces = true;
1210      }
1211
1212      // If we have ${:foo}, then this is not a real operand reference, it is a
1213      // "magic" string reference, just like in .td files.  Arrange to call
1214      // PrintSpecial.
1215      if (HasCurlyBraces && *LastEmitted == ':') {
1216        ++LastEmitted;
1217        const char *StrStart = LastEmitted;
1218        const char *StrEnd = strchr(StrStart, '}');
1219        if (StrEnd == 0) {
1220          llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1221                            + std::string(AsmStr) + "'");
1222        }
1223
1224        std::string Val(StrStart, StrEnd);
1225        PrintSpecial(MI, Val.c_str());
1226        LastEmitted = StrEnd+1;
1227        break;
1228      }
1229
1230      const char *IDStart = LastEmitted;
1231      char *IDEnd;
1232      errno = 0;
1233      long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1234      if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1235        llvm_report_error("Bad $ operand number in inline asm string: '"
1236                          + std::string(AsmStr) + "'");
1237      }
1238      LastEmitted = IDEnd;
1239
1240      char Modifier[2] = { 0, 0 };
1241
1242      if (HasCurlyBraces) {
1243        // If we have curly braces, check for a modifier character.  This
1244        // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1245        if (*LastEmitted == ':') {
1246          ++LastEmitted;    // Consume ':' character.
1247          if (*LastEmitted == 0) {
1248            llvm_report_error("Bad ${:} expression in inline asm string: '"
1249                              + std::string(AsmStr) + "'");
1250          }
1251
1252          Modifier[0] = *LastEmitted;
1253          ++LastEmitted;    // Consume modifier character.
1254        }
1255
1256        if (*LastEmitted != '}') {
1257          llvm_report_error("Bad ${} expression in inline asm string: '"
1258                            + std::string(AsmStr) + "'");
1259        }
1260        ++LastEmitted;    // Consume '}' character.
1261      }
1262
1263      if ((unsigned)Val >= NumOperands-1) {
1264        llvm_report_error("Invalid $ operand number in inline asm string: '"
1265                          + std::string(AsmStr) + "'");
1266      }
1267
1268      // Okay, we finally have a value number.  Ask the target to print this
1269      // operand!
1270      if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1271        unsigned OpNo = 1;
1272
1273        bool Error = false;
1274
1275        // Scan to find the machine operand number for the operand.
1276        for (; Val; --Val) {
1277          if (OpNo >= MI->getNumOperands()) break;
1278          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1279          OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1280        }
1281
1282        if (OpNo >= MI->getNumOperands()) {
1283          Error = true;
1284        } else {
1285          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1286          ++OpNo;  // Skip over the ID number.
1287
1288          if (Modifier[0] == 'l')  // labels are target independent
1289            O << *MI->getOperand(OpNo).getMBB()->getSymbol(OutContext);
1290          else {
1291            AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1292            if ((OpFlags & 7) == 4) {
1293              Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1294                                                Modifier[0] ? Modifier : 0);
1295            } else {
1296              Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1297                                          Modifier[0] ? Modifier : 0);
1298            }
1299          }
1300        }
1301        if (Error) {
1302          std::string msg;
1303          raw_string_ostream Msg(msg);
1304          Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n";
1305          MI->print(Msg);
1306          llvm_report_error(Msg.str());
1307        }
1308      }
1309      break;
1310    }
1311    }
1312  }
1313  O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd();
1314}
1315
1316/// printImplicitDef - This method prints the specified machine instruction
1317/// that is an implicit def.
1318void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1319  if (!VerboseAsm) return;
1320  O.PadToColumn(MAI->getCommentColumn());
1321  O << MAI->getCommentString() << " implicit-def: "
1322    << TRI->getName(MI->getOperand(0).getReg());
1323}
1324
1325void AsmPrinter::printKill(const MachineInstr *MI) const {
1326  if (!VerboseAsm) return;
1327  O.PadToColumn(MAI->getCommentColumn());
1328  O << MAI->getCommentString() << " kill:";
1329  for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) {
1330    const MachineOperand &op = MI->getOperand(n);
1331    assert(op.isReg() && "KILL instruction must have only register operands");
1332    O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>");
1333  }
1334}
1335
1336/// printLabel - This method prints a local label used by debug and
1337/// exception handling tables.
1338void AsmPrinter::printLabel(const MachineInstr *MI) const {
1339  printLabel(MI->getOperand(0).getImm());
1340}
1341
1342void AsmPrinter::printLabel(unsigned Id) const {
1343  O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':';
1344}
1345
1346/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1347/// instruction, using the specified assembler variant.  Targets should
1348/// override this to format as appropriate.
1349bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1350                                 unsigned AsmVariant, const char *ExtraCode) {
1351  // Target doesn't support this yet!
1352  return true;
1353}
1354
1355bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1356                                       unsigned AsmVariant,
1357                                       const char *ExtraCode) {
1358  // Target doesn't support this yet!
1359  return true;
1360}
1361
1362MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA,
1363                                            const char *Suffix) const {
1364  return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock(), Suffix);
1365}
1366
1367MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F,
1368                                            const BasicBlock *BB,
1369                                            const char *Suffix) const {
1370  assert(BB->hasName() &&
1371         "Address of anonymous basic block not supported yet!");
1372
1373  // This code must use the function name itself, and not the function number,
1374  // since it must be possible to generate the label name from within other
1375  // functions.
1376  SmallString<60> FnName;
1377  Mang->getNameWithPrefix(FnName, F, false);
1378
1379  // FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME!
1380  SmallString<60> NameResult;
1381  Mang->getNameWithPrefix(NameResult,
1382                          StringRef("BA") + Twine((unsigned)FnName.size()) +
1383                          "_" + FnName.str() + "_" + BB->getName() + Suffix,
1384                          Mangler::Private);
1385
1386  return OutContext.GetOrCreateSymbol(NameResult.str());
1387}
1388
1389/// GetCPISymbol - Return the symbol for the specified constant pool entry.
1390MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
1391  SmallString<60> Name;
1392  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI"
1393    << getFunctionNumber() << '_' << CPID;
1394  return OutContext.GetOrCreateSymbol(Name.str());
1395}
1396
1397/// GetJTISymbol - Return the symbol for the specified jump table entry.
1398MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
1399  const char *Prefix = isLinkerPrivate ? MAI->getLinkerPrivateGlobalPrefix() :
1400                                         MAI->getPrivateGlobalPrefix();
1401  SmallString<60> Name;
1402  raw_svector_ostream(Name) << Prefix << "JTI" << getFunctionNumber() << '_'
1403    << JTID;
1404  return OutContext.GetOrCreateSymbol(Name.str());
1405}
1406
1407/// GetJTSetSymbol - Return the symbol for the specified jump table .set
1408/// FIXME: privatize to AsmPrinter.
1409MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
1410  SmallString<60> Name;
1411  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix()
1412    << getFunctionNumber() << '_' << UID << "_set_" << MBBID;
1413  return OutContext.GetOrCreateSymbol(Name.str());
1414}
1415
1416/// GetGlobalValueSymbol - Return the MCSymbol for the specified global
1417/// value.
1418MCSymbol *AsmPrinter::GetGlobalValueSymbol(const GlobalValue *GV) const {
1419  SmallString<60> NameStr;
1420  Mang->getNameWithPrefix(NameStr, GV, false);
1421  return OutContext.GetOrCreateSymbol(NameStr.str());
1422}
1423
1424/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
1425/// global value name as its base, with the specified suffix, and where the
1426/// symbol is forced to have private linkage if ForcePrivate is true.
1427MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
1428                                                   StringRef Suffix,
1429                                                   bool ForcePrivate) const {
1430  SmallString<60> NameStr;
1431  Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
1432  NameStr.append(Suffix.begin(), Suffix.end());
1433  return OutContext.GetOrCreateSymbol(NameStr.str());
1434}
1435
1436/// GetExternalSymbolSymbol - Return the MCSymbol for the specified
1437/// ExternalSymbol.
1438MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
1439  SmallString<60> NameStr;
1440  Mang->getNameWithPrefix(NameStr, Sym);
1441  return OutContext.GetOrCreateSymbol(NameStr.str());
1442}
1443
1444
1445
1446/// PrintParentLoopComment - Print comments about parent loops of this one.
1447static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1448                                   unsigned FunctionNumber) {
1449  if (Loop == 0) return;
1450  PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
1451  OS.indent(Loop->getLoopDepth()*2)
1452    << "Parent Loop BB" << FunctionNumber << "_"
1453    << Loop->getHeader()->getNumber()
1454    << " Depth=" << Loop->getLoopDepth() << '\n';
1455}
1456
1457
1458/// PrintChildLoopComment - Print comments about child loops within
1459/// the loop for this basic block, with nesting.
1460static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1461                                  unsigned FunctionNumber) {
1462  // Add child loop information
1463  for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
1464    OS.indent((*CL)->getLoopDepth()*2)
1465      << "Child Loop BB" << FunctionNumber << "_"
1466      << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
1467      << '\n';
1468    PrintChildLoopComment(OS, *CL, FunctionNumber);
1469  }
1470}
1471
1472/// EmitComments - Pretty-print comments for basic blocks.
1473static void PrintBasicBlockLoopComments(const MachineBasicBlock &MBB,
1474                                        const MachineLoopInfo *LI,
1475                                        const AsmPrinter &AP) {
1476  // Add loop depth information
1477  const MachineLoop *Loop = LI->getLoopFor(&MBB);
1478  if (Loop == 0) return;
1479
1480  MachineBasicBlock *Header = Loop->getHeader();
1481  assert(Header && "No header for loop");
1482
1483  // If this block is not a loop header, just print out what is the loop header
1484  // and return.
1485  if (Header != &MBB) {
1486    AP.OutStreamer.AddComment("  in Loop: Header=BB" +
1487                              Twine(AP.getFunctionNumber())+"_" +
1488                              Twine(Loop->getHeader()->getNumber())+
1489                              " Depth="+Twine(Loop->getLoopDepth()));
1490    return;
1491  }
1492
1493  // Otherwise, it is a loop header.  Print out information about child and
1494  // parent loops.
1495  raw_ostream &OS = AP.OutStreamer.GetCommentOS();
1496
1497  PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
1498
1499  OS << "=>";
1500  OS.indent(Loop->getLoopDepth()*2-2);
1501
1502  OS << "This ";
1503  if (Loop->empty())
1504    OS << "Inner ";
1505  OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
1506
1507  PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
1508}
1509
1510
1511/// EmitBasicBlockStart - This method prints the label for the specified
1512/// MachineBasicBlock, an alignment (if present) and a comment describing
1513/// it if appropriate.
1514void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
1515  // Emit an alignment directive for this block, if needed.
1516  if (unsigned Align = MBB->getAlignment())
1517    EmitAlignment(Log2_32(Align));
1518
1519  // If the block has its address taken, emit a special label to satisfy
1520  // references to the block. This is done so that we don't need to
1521  // remember the number of this label, and so that we can make
1522  // forward references to labels without knowing what their numbers
1523  // will be.
1524  if (MBB->hasAddressTaken()) {
1525    const BasicBlock *BB = MBB->getBasicBlock();
1526    if (VerboseAsm)
1527      OutStreamer.AddComment("Address Taken");
1528    OutStreamer.EmitLabel(GetBlockAddressSymbol(BB->getParent(), BB));
1529  }
1530
1531  // Print the main label for the block.
1532  if (MBB->pred_empty() || MBB->isOnlyReachableByFallthrough()) {
1533    if (VerboseAsm) {
1534      // NOTE: Want this comment at start of line.
1535      O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':';
1536      if (const BasicBlock *BB = MBB->getBasicBlock())
1537        if (BB->hasName())
1538          OutStreamer.AddComment("%" + BB->getName());
1539
1540      PrintBasicBlockLoopComments(*MBB, LI, *this);
1541      OutStreamer.AddBlankLine();
1542    }
1543  } else {
1544    if (VerboseAsm) {
1545      if (const BasicBlock *BB = MBB->getBasicBlock())
1546        if (BB->hasName())
1547          OutStreamer.AddComment("%" + BB->getName());
1548      PrintBasicBlockLoopComments(*MBB, LI, *this);
1549    }
1550
1551    OutStreamer.EmitLabel(MBB->getSymbol(OutContext));
1552  }
1553}
1554
1555/// printPICJumpTableSetLabel - This method prints a set label for the
1556/// specified MachineBasicBlock for a jumptable entry.
1557void AsmPrinter::printPICJumpTableSetLabel(unsigned uid,
1558                                           const MachineBasicBlock *MBB) const {
1559  if (!MAI->getSetDirective())
1560    return;
1561
1562  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1563    << *GetJTSetSymbol(uid, MBB->getNumber()) << ','
1564    << *MBB->getSymbol(OutContext) << '-' << *GetJTISymbol(uid) << '\n';
1565}
1566
1567void AsmPrinter::printVisibility(MCSymbol *Sym, unsigned Visibility) const {
1568  MCSymbolAttr Attr = MCSA_Invalid;
1569
1570  switch (Visibility) {
1571  default: break;
1572  case GlobalValue::HiddenVisibility:
1573    Attr = MAI->getHiddenVisibilityAttr();
1574    break;
1575  case GlobalValue::ProtectedVisibility:
1576    Attr = MAI->getProtectedVisibilityAttr();
1577    break;
1578  }
1579
1580  if (Attr != MCSA_Invalid)
1581    OutStreamer.EmitSymbolAttribute(Sym, Attr);
1582}
1583
1584void AsmPrinter::printOffset(int64_t Offset) const {
1585  if (Offset > 0)
1586    O << '+' << Offset;
1587  else if (Offset < 0)
1588    O << Offset;
1589}
1590
1591GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1592  if (!S->usesMetadata())
1593    return 0;
1594
1595  gcp_iterator GCPI = GCMetadataPrinters.find(S);
1596  if (GCPI != GCMetadataPrinters.end())
1597    return GCPI->second;
1598
1599  const char *Name = S->getName().c_str();
1600
1601  for (GCMetadataPrinterRegistry::iterator
1602         I = GCMetadataPrinterRegistry::begin(),
1603         E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1604    if (strcmp(Name, I->getName()) == 0) {
1605      GCMetadataPrinter *GMP = I->instantiate();
1606      GMP->S = S;
1607      GCMetadataPrinters.insert(std::make_pair(S, GMP));
1608      return GMP;
1609    }
1610
1611  llvm_report_error("no GCMetadataPrinter registered for GC: " + Twine(Name));
1612  return 0;
1613}
1614
1615/// EmitComments - Pretty-print comments for instructions
1616void AsmPrinter::EmitComments(const MachineInstr &MI) const {
1617  if (!VerboseAsm)
1618    return;
1619
1620  bool Newline = false;
1621
1622  if (!MI.getDebugLoc().isUnknown()) {
1623    DILocation DLT = MF->getDILocation(MI.getDebugLoc());
1624
1625    // Print source line info.
1626    O.PadToColumn(MAI->getCommentColumn());
1627    O << MAI->getCommentString() << ' ';
1628    DIScope Scope = DLT.getScope();
1629    // Omit the directory, because it's likely to be long and uninteresting.
1630    if (!Scope.isNull())
1631      O << Scope.getFilename();
1632    else
1633      O << "<unknown>";
1634    O << ':' << DLT.getLineNumber();
1635    if (DLT.getColumnNumber() != 0)
1636      O << ':' << DLT.getColumnNumber();
1637    Newline = true;
1638  }
1639
1640  // Check for spills and reloads
1641  int FI;
1642
1643  const MachineFrameInfo *FrameInfo =
1644    MI.getParent()->getParent()->getFrameInfo();
1645
1646  // We assume a single instruction only has a spill or reload, not
1647  // both.
1648  const MachineMemOperand *MMO;
1649  if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
1650    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1651      MMO = *MI.memoperands_begin();
1652      if (Newline) O << '\n';
1653      O.PadToColumn(MAI->getCommentColumn());
1654      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Reload";
1655      Newline = true;
1656    }
1657  }
1658  else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
1659    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1660      if (Newline) O << '\n';
1661      O.PadToColumn(MAI->getCommentColumn());
1662      O << MAI->getCommentString() << ' '
1663        << MMO->getSize() << "-byte Folded Reload";
1664      Newline = true;
1665    }
1666  }
1667  else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
1668    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1669      MMO = *MI.memoperands_begin();
1670      if (Newline) O << '\n';
1671      O.PadToColumn(MAI->getCommentColumn());
1672      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Spill";
1673      Newline = true;
1674    }
1675  }
1676  else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
1677    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1678      if (Newline) O << '\n';
1679      O.PadToColumn(MAI->getCommentColumn());
1680      O << MAI->getCommentString() << ' '
1681        << MMO->getSize() << "-byte Folded Spill";
1682      Newline = true;
1683    }
1684  }
1685
1686  // Check for spill-induced copies
1687  unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
1688  if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg,
1689                                      SrcSubIdx, DstSubIdx)) {
1690    if (MI.getAsmPrinterFlag(ReloadReuse)) {
1691      if (Newline) O << '\n';
1692      O.PadToColumn(MAI->getCommentColumn());
1693      O << MAI->getCommentString() << " Reload Reuse";
1694    }
1695  }
1696}
1697
1698