AsmPrinter.cpp revision 85fe07866a3b240d9facef3b2f2ea81a0a8db018 
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), FunctionNumber(0), 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
90TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
91  return TM.getTargetLowering()->getObjFileLowering();
92}
93
94/// getCurrentSection() - Return the current section we are emitting to.
95const MCSection *AsmPrinter::getCurrentSection() const {
96  return OutStreamer.getCurrentSection();
97}
98
99
100void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
101  AU.setPreservesAll();
102  MachineFunctionPass::getAnalysisUsage(AU);
103  AU.addRequired<GCModuleInfo>();
104  if (VerboseAsm)
105    AU.addRequired<MachineLoopInfo>();
106}
107
108bool AsmPrinter::doInitialization(Module &M) {
109  // Initialize TargetLoweringObjectFile.
110  const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
111    .Initialize(OutContext, TM);
112
113  Mang = new Mangler(*MAI);
114
115  // Allow the target to emit any magic that it wants at the start of the file.
116  EmitStartOfAsmFile(M);
117
118  // Very minimal debug info. It is ignored if we emit actual debug info. If we
119  // don't, this at least helps the user find where a global came from.
120  if (MAI->hasSingleParameterDotFile()) {
121    // .file "foo.c"
122    OutStreamer.EmitFileDirective(M.getModuleIdentifier());
123  }
124
125  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
126  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
127  for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
128    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
129      MP->beginAssembly(O, *this, *MAI);
130
131  if (!M.getModuleInlineAsm().empty())
132    O << MAI->getCommentString() << " Start of file scope inline assembly\n"
133      << M.getModuleInlineAsm()
134      << '\n' << MAI->getCommentString()
135      << " End of file scope inline assembly\n";
136
137  MMI = getAnalysisIfAvailable<MachineModuleInfo>();
138  if (MMI)
139    MMI->AnalyzeModule(M);
140  DW = getAnalysisIfAvailable<DwarfWriter>();
141  if (DW)
142    DW->BeginModule(&M, MMI, O, this, MAI);
143
144  return false;
145}
146
147/// EmitGlobalVariable - Emit the specified global variable to the .s file.
148void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
149  if (!GV->hasInitializer())   // External globals require no code.
150    return;
151
152  // Check to see if this is a special global used by LLVM, if so, emit it.
153  if (EmitSpecialLLVMGlobal(GV))
154    return;
155
156  MCSymbol *GVSym = GetGlobalValueSymbol(GV);
157  printVisibility(GVSym, GV->getVisibility());
158
159  if (MAI->hasDotTypeDotSizeDirective())
160    OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
161
162  SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
163
164  const TargetData *TD = TM.getTargetData();
165  unsigned Size = TD->getTypeAllocSize(GV->getType()->getElementType());
166  unsigned AlignLog = TD->getPreferredAlignmentLog(GV);
167
168  // Handle common and BSS local symbols (.lcomm).
169  if (GVKind.isCommon() || GVKind.isBSSLocal()) {
170    if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
171
172    if (VerboseAsm) {
173      WriteAsOperand(OutStreamer.GetCommentOS(), GV,
174                     /*PrintType=*/false, GV->getParent());
175      OutStreamer.GetCommentOS() << '\n';
176    }
177
178    // Handle common symbols.
179    if (GVKind.isCommon()) {
180      // .comm _foo, 42, 4
181      OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
182      return;
183    }
184
185    // Handle local BSS symbols.
186    if (MAI->hasMachoZeroFillDirective()) {
187      const MCSection *TheSection =
188        getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
189      // .zerofill __DATA, __bss, _foo, 400, 5
190      OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
191      return;
192    }
193
194    if (MAI->hasLCOMMDirective()) {
195      // .lcomm _foo, 42
196      OutStreamer.EmitLocalCommonSymbol(GVSym, Size);
197      return;
198    }
199
200    // .local _foo
201    OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Local);
202    // .comm _foo, 42, 4
203    OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
204    return;
205  }
206
207  const MCSection *TheSection =
208    getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
209
210  // Handle the zerofill directive on darwin, which is a special form of BSS
211  // emission.
212  if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
213    // .globl _foo
214    OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
215    // .zerofill __DATA, __common, _foo, 400, 5
216    OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
217    return;
218  }
219
220  OutStreamer.SwitchSection(TheSection);
221
222  // TODO: Factor into an 'emit linkage' thing that is shared with function
223  // bodies.
224  switch (GV->getLinkage()) {
225  case GlobalValue::CommonLinkage:
226  case GlobalValue::LinkOnceAnyLinkage:
227  case GlobalValue::LinkOnceODRLinkage:
228  case GlobalValue::WeakAnyLinkage:
229  case GlobalValue::WeakODRLinkage:
230  case GlobalValue::LinkerPrivateLinkage:
231    if (MAI->getWeakDefDirective() != 0) {
232      // .globl _foo
233      OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
234      // .weak_definition _foo
235      OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
236    } else if (const char *LinkOnce = MAI->getLinkOnceDirective()) {
237      // .globl _foo
238      OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
239      // FIXME: linkonce should be a section attribute, handled by COFF Section
240      // assignment.
241      // http://sourceware.org/binutils/docs-2.20/as/Linkonce.html#Linkonce
242      // .linkonce same_size
243      O << LinkOnce;
244    } else {
245      // .weak _foo
246      OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
247    }
248    break;
249  case GlobalValue::DLLExportLinkage:
250  case GlobalValue::AppendingLinkage:
251    // FIXME: appending linkage variables should go into a section of
252    // their name or something.  For now, just emit them as external.
253  case GlobalValue::ExternalLinkage:
254    // If external or appending, declare as a global symbol.
255    // .globl _foo
256    OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
257    break;
258  case GlobalValue::PrivateLinkage:
259  case GlobalValue::InternalLinkage:
260     break;
261  default:
262    llvm_unreachable("Unknown linkage type!");
263  }
264
265  EmitAlignment(AlignLog, GV);
266  if (VerboseAsm) {
267    WriteAsOperand(OutStreamer.GetCommentOS(), GV,
268                   /*PrintType=*/false, GV->getParent());
269    OutStreamer.GetCommentOS() << '\n';
270  }
271  OutStreamer.EmitLabel(GVSym);
272
273  EmitGlobalConstant(GV->getInitializer());
274
275  if (MAI->hasDotTypeDotSizeDirective())
276    // .size foo, 42
277    OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext));
278
279  OutStreamer.AddBlankLine();
280}
281
282
283bool AsmPrinter::doFinalization(Module &M) {
284  // Emit global variables.
285  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
286       I != E; ++I)
287    EmitGlobalVariable(I);
288
289  // Emit final debug information.
290  if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
291    DW->EndModule();
292
293  // If the target wants to know about weak references, print them all.
294  if (MAI->getWeakRefDirective()) {
295    // FIXME: This is not lazy, it would be nice to only print weak references
296    // to stuff that is actually used.  Note that doing so would require targets
297    // to notice uses in operands (due to constant exprs etc).  This should
298    // happen with the MC stuff eventually.
299
300    // Print out module-level global variables here.
301    for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
302         I != E; ++I) {
303      if (!I->hasExternalWeakLinkage()) continue;
304      OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(I),
305                                      MCSA_WeakReference);
306    }
307
308    for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
309      if (!I->hasExternalWeakLinkage()) continue;
310      OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(I),
311                                      MCSA_WeakReference);
312    }
313  }
314
315  if (MAI->getSetDirective()) {
316    OutStreamer.AddBlankLine();
317    for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
318         I != E; ++I) {
319      MCSymbol *Name = GetGlobalValueSymbol(I);
320
321      const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
322      MCSymbol *Target = GetGlobalValueSymbol(GV);
323
324      if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
325        OutStreamer.EmitSymbolAttribute(Name, MCSA_Global);
326      else if (I->hasWeakLinkage())
327        OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference);
328      else
329        assert(I->hasLocalLinkage() && "Invalid alias linkage");
330
331      printVisibility(Name, I->getVisibility());
332
333      O << MAI->getSetDirective() << ' ' << *Name << ", " << *Target << '\n';
334    }
335  }
336
337  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
338  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
339  for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
340    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
341      MP->finishAssembly(O, *this, *MAI);
342
343  // If we don't have any trampolines, then we don't require stack memory
344  // to be executable. Some targets have a directive to declare this.
345  Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
346  if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
347    if (MCSection *S = MAI->getNonexecutableStackSection(OutContext))
348      OutStreamer.SwitchSection(S);
349
350  // Allow the target to emit any magic that it wants at the end of the file,
351  // after everything else has gone out.
352  EmitEndOfAsmFile(M);
353
354  delete Mang; Mang = 0;
355  DW = 0; MMI = 0;
356
357  OutStreamer.Finish();
358  return false;
359}
360
361void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
362  // Get the function symbol.
363  CurrentFnSym = GetGlobalValueSymbol(MF.getFunction());
364  IncrementFunctionNumber();
365
366  if (VerboseAsm)
367    LI = &getAnalysis<MachineLoopInfo>();
368}
369
370namespace {
371  // SectionCPs - Keep track the alignment, constpool entries per Section.
372  struct SectionCPs {
373    const MCSection *S;
374    unsigned Alignment;
375    SmallVector<unsigned, 4> CPEs;
376    SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
377  };
378}
379
380/// EmitConstantPool - Print to the current output stream assembly
381/// representations of the constants in the constant pool MCP. This is
382/// used to print out constants which have been "spilled to memory" by
383/// the code generator.
384///
385void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
386  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
387  if (CP.empty()) return;
388
389  // Calculate sections for constant pool entries. We collect entries to go into
390  // the same section together to reduce amount of section switch statements.
391  SmallVector<SectionCPs, 4> CPSections;
392  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
393    const MachineConstantPoolEntry &CPE = CP[i];
394    unsigned Align = CPE.getAlignment();
395
396    SectionKind Kind;
397    switch (CPE.getRelocationInfo()) {
398    default: llvm_unreachable("Unknown section kind");
399    case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
400    case 1:
401      Kind = SectionKind::getReadOnlyWithRelLocal();
402      break;
403    case 0:
404    switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
405    case 4:  Kind = SectionKind::getMergeableConst4(); break;
406    case 8:  Kind = SectionKind::getMergeableConst8(); break;
407    case 16: Kind = SectionKind::getMergeableConst16();break;
408    default: Kind = SectionKind::getMergeableConst(); break;
409    }
410    }
411
412    const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
413
414    // The number of sections are small, just do a linear search from the
415    // last section to the first.
416    bool Found = false;
417    unsigned SecIdx = CPSections.size();
418    while (SecIdx != 0) {
419      if (CPSections[--SecIdx].S == S) {
420        Found = true;
421        break;
422      }
423    }
424    if (!Found) {
425      SecIdx = CPSections.size();
426      CPSections.push_back(SectionCPs(S, Align));
427    }
428
429    if (Align > CPSections[SecIdx].Alignment)
430      CPSections[SecIdx].Alignment = Align;
431    CPSections[SecIdx].CPEs.push_back(i);
432  }
433
434  // Now print stuff into the calculated sections.
435  for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
436    OutStreamer.SwitchSection(CPSections[i].S);
437    EmitAlignment(Log2_32(CPSections[i].Alignment));
438
439    unsigned Offset = 0;
440    for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
441      unsigned CPI = CPSections[i].CPEs[j];
442      MachineConstantPoolEntry CPE = CP[CPI];
443
444      // Emit inter-object padding for alignment.
445      unsigned AlignMask = CPE.getAlignment() - 1;
446      unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
447      OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/);
448
449      const Type *Ty = CPE.getType();
450      Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
451
452      // Emit the label with a comment on it.
453      if (VerboseAsm) {
454        OutStreamer.GetCommentOS() << "constant pool ";
455        WriteTypeSymbolic(OutStreamer.GetCommentOS(), CPE.getType(),
456                          MF->getFunction()->getParent());
457        OutStreamer.GetCommentOS() << '\n';
458      }
459      OutStreamer.EmitLabel(GetCPISymbol(CPI));
460
461      if (CPE.isMachineConstantPoolEntry())
462        EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
463      else
464        EmitGlobalConstant(CPE.Val.ConstVal);
465    }
466  }
467}
468
469/// EmitJumpTableInfo - Print assembly representations of the jump tables used
470/// by the current function to the current output stream.
471///
472void AsmPrinter::EmitJumpTableInfo(MachineFunction &MF) {
473  MachineJumpTableInfo *MJTI = MF.getJumpTableInfo();
474  if (MJTI == 0) return;
475  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
476  if (JT.empty()) return;
477
478  bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
479
480  // Pick the directive to use to print the jump table entries, and switch to
481  // the appropriate section.
482  const Function *F = MF.getFunction();
483  bool JTInDiffSection = false;
484  if (F->isWeakForLinker() ||
485      (IsPic && !TM.getTargetLowering()->usesGlobalOffsetTable())) {
486    // In PIC mode, we need to emit the jump table to the same section as the
487    // function body itself, otherwise the label differences won't make sense.
488    // We should also do if the section name is NULL or function is declared in
489    // discardable section.
490    OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang,
491                                                                    TM));
492  } else {
493    // Otherwise, drop it in the readonly section.
494    const MCSection *ReadOnlySection =
495      getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
496    OutStreamer.SwitchSection(ReadOnlySection);
497    JTInDiffSection = true;
498  }
499
500  unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData());
501  EmitAlignment(Log2_32(MJTI->getEntryAlignment(*TM.getTargetData())));
502
503  for (unsigned i = 0, e = JT.size(); i != e; ++i) {
504    const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
505
506    // If this jump table was deleted, ignore it.
507    if (JTBBs.empty()) continue;
508
509    // For PIC codegen, if possible we want to use the SetDirective to reduce
510    // the number of relocations the assembler will generate for the jump table.
511    // Set directives are all printed before the jump table itself.
512    SmallPtrSet<MachineBasicBlock*, 16> EmittedSets;
513    if (MAI->getSetDirective() && IsPic)
514      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
515        if (EmittedSets.insert(JTBBs[ii]))
516          printPICJumpTableSetLabel(i, JTBBs[ii]);
517
518    // On some targets (e.g. Darwin) we want to emit two consequtive labels
519    // before each jump table.  The first label is never referenced, but tells
520    // the assembler and linker the extents of the jump table object.  The
521    // second label is actually referenced by the code.
522    if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0])
523      OutStreamer.EmitLabel(GetJTISymbol(i, true));
524
525    OutStreamer.EmitLabel(GetJTISymbol(i));
526
527    if (!IsPic) {
528      // In non-pic mode, the entries in the jump table are direct references
529      // to the basic blocks.
530      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
531        MCSymbol *MBBSym = GetMBBSymbol(JTBBs[ii]->getNumber());
532        OutStreamer.EmitValue(MCSymbolRefExpr::Create(MBBSym, OutContext),
533                              EntrySize, /*addrspace*/0);
534      }
535    } else {
536      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
537        printPICJumpTableEntry(MJTI, JTBBs[ii], i);
538    }
539  }
540}
541
542void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
543                                        const MachineBasicBlock *MBB,
544                                        unsigned uid) const {
545  const MCExpr *Value = 0;
546  switch (MJTI->getEntryKind()) {
547  case MachineJumpTableInfo::EK_Custom32:
548    Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, uid,
549                                                              OutContext);
550    break;
551  case MachineJumpTableInfo::EK_BlockAddress:
552    // EK_BlockAddress - Each entry is a plain address of block, e.g.:
553    //     .word LBB123
554    Value = MCSymbolRefExpr::Create(GetMBBSymbol(MBB->getNumber()), OutContext);
555    break;
556  case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
557    // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
558    // with a relocation as gp-relative, e.g.:
559    //     .gprel32 LBB123
560    MCSymbol *MBBSym = GetMBBSymbol(MBB->getNumber());
561    OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
562    return;
563  }
564
565  case MachineJumpTableInfo::EK_LabelDifference32: {
566    // EK_LabelDifference32 - Each entry is the address of the block minus
567    // the address of the jump table.  This is used for PIC jump tables where
568    // gprel32 is not supported.  e.g.:
569    //      .word LBB123 - LJTI1_2
570    // If the .set directive is supported, this is emitted as:
571    //      .set L4_5_set_123, LBB123 - LJTI1_2
572    //      .word L4_5_set_123
573
574    // If we have emitted set directives for the jump table entries, print
575    // them rather than the entries themselves.  If we're emitting PIC, then
576    // emit the table entries as differences between two text section labels.
577    if (MAI->getSetDirective()) {
578      // If we used .set, reference the .set's symbol.
579      Value = MCSymbolRefExpr::Create(GetJTSetSymbol(uid, MBB->getNumber()),
580                                      OutContext);
581      break;
582    }
583    // Otherwise, use the difference as the jump table entry.
584    Value = MCSymbolRefExpr::Create(GetMBBSymbol(MBB->getNumber()), OutContext);
585    const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(uid), OutContext);
586    Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext);
587    break;
588  }
589  }
590
591  assert(Value && "Unknown entry kind!");
592
593  unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData());
594  OutStreamer.EmitValue(Value, EntrySize, /*addrspace*/0);
595}
596
597
598/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
599/// special global used by LLVM.  If so, emit it and return true, otherwise
600/// do nothing and return false.
601bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
602  if (GV->getName() == "llvm.used") {
603    if (MAI->hasNoDeadStrip())    // No need to emit this at all.
604      EmitLLVMUsedList(GV->getInitializer());
605    return true;
606  }
607
608  // Ignore debug and non-emitted data.  This handles llvm.compiler.used.
609  if (GV->getSection() == "llvm.metadata" ||
610      GV->hasAvailableExternallyLinkage())
611    return true;
612
613  if (!GV->hasAppendingLinkage()) return false;
614
615  assert(GV->hasInitializer() && "Not a special LLVM global!");
616
617  const TargetData *TD = TM.getTargetData();
618  unsigned Align = Log2_32(TD->getPointerPrefAlignment());
619  if (GV->getName() == "llvm.global_ctors") {
620    OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
621    EmitAlignment(Align, 0);
622    EmitXXStructorList(GV->getInitializer());
623
624    if (TM.getRelocationModel() == Reloc::Static &&
625        MAI->hasStaticCtorDtorReferenceInStaticMode()) {
626      StringRef Sym(".constructors_used");
627      OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
628                                      MCSA_Reference);
629    }
630    return true;
631  }
632
633  if (GV->getName() == "llvm.global_dtors") {
634    OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
635    EmitAlignment(Align, 0);
636    EmitXXStructorList(GV->getInitializer());
637
638    if (TM.getRelocationModel() == Reloc::Static &&
639        MAI->hasStaticCtorDtorReferenceInStaticMode()) {
640      StringRef Sym(".destructors_used");
641      OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
642                                      MCSA_Reference);
643    }
644    return true;
645  }
646
647  return false;
648}
649
650/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
651/// global in the specified llvm.used list for which emitUsedDirectiveFor
652/// is true, as being used with this directive.
653void AsmPrinter::EmitLLVMUsedList(Constant *List) {
654  // Should be an array of 'i8*'.
655  ConstantArray *InitList = dyn_cast<ConstantArray>(List);
656  if (InitList == 0) return;
657
658  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
659    const GlobalValue *GV =
660      dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
661    if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang))
662      OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(GV),
663                                      MCSA_NoDeadStrip);
664  }
665}
666
667/// EmitXXStructorList - Emit the ctor or dtor list.  This just prints out the
668/// function pointers, ignoring the init priority.
669void AsmPrinter::EmitXXStructorList(Constant *List) {
670  // Should be an array of '{ int, void ()* }' structs.  The first value is the
671  // init priority, which we ignore.
672  if (!isa<ConstantArray>(List)) return;
673  ConstantArray *InitList = cast<ConstantArray>(List);
674  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
675    if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
676      if (CS->getNumOperands() != 2) return;  // Not array of 2-element structs.
677
678      if (CS->getOperand(1)->isNullValue())
679        return;  // Found a null terminator, exit printing.
680      // Emit the function pointer.
681      EmitGlobalConstant(CS->getOperand(1));
682    }
683}
684
685//===--------------------------------------------------------------------===//
686// Emission and print routines
687//
688
689/// EmitInt8 - Emit a byte directive and value.
690///
691void AsmPrinter::EmitInt8(int Value) const {
692  OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/);
693}
694
695/// EmitInt16 - Emit a short directive and value.
696///
697void AsmPrinter::EmitInt16(int Value) const {
698  OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/);
699}
700
701/// EmitInt32 - Emit a long directive and value.
702///
703void AsmPrinter::EmitInt32(int Value) const {
704  OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/);
705}
706
707/// EmitInt64 - Emit a long long directive and value.
708///
709void AsmPrinter::EmitInt64(uint64_t Value) const {
710  OutStreamer.EmitIntValue(Value, 8, 0/*addrspace*/);
711}
712
713//===----------------------------------------------------------------------===//
714
715// EmitAlignment - Emit an alignment directive to the specified power of
716// two boundary.  For example, if you pass in 3 here, you will get an 8
717// byte alignment.  If a global value is specified, and if that global has
718// an explicit alignment requested, it will unconditionally override the
719// alignment request.  However, if ForcedAlignBits is specified, this value
720// has final say: the ultimate alignment will be the max of ForcedAlignBits
721// and the alignment computed with NumBits and the global.
722//
723// The algorithm is:
724//     Align = NumBits;
725//     if (GV && GV->hasalignment) Align = GV->getalignment();
726//     Align = std::max(Align, ForcedAlignBits);
727//
728void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
729                               unsigned ForcedAlignBits,
730                               bool UseFillExpr) const {
731  if (GV && GV->getAlignment())
732    NumBits = Log2_32(GV->getAlignment());
733  NumBits = std::max(NumBits, ForcedAlignBits);
734
735  if (NumBits == 0) return;   // No need to emit alignment.
736
737  unsigned FillValue = 0;
738  if (getCurrentSection()->getKind().isText())
739    FillValue = MAI->getTextAlignFillValue();
740
741  OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0);
742}
743
744/// LowerConstant - Lower the specified LLVM Constant to an MCExpr.
745///
746static const MCExpr *LowerConstant(const Constant *CV, AsmPrinter &AP) {
747  MCContext &Ctx = AP.OutContext;
748
749  if (CV->isNullValue() || isa<UndefValue>(CV))
750    return MCConstantExpr::Create(0, Ctx);
751
752  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
753    return MCConstantExpr::Create(CI->getZExtValue(), Ctx);
754
755  if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
756    return MCSymbolRefExpr::Create(AP.GetGlobalValueSymbol(GV), Ctx);
757  if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
758    return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx);
759
760  const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
761  if (CE == 0) {
762    llvm_unreachable("Unknown constant value to lower!");
763    return MCConstantExpr::Create(0, Ctx);
764  }
765
766  switch (CE->getOpcode()) {
767  case Instruction::ZExt:
768  case Instruction::SExt:
769  case Instruction::FPTrunc:
770  case Instruction::FPExt:
771  case Instruction::UIToFP:
772  case Instruction::SIToFP:
773  case Instruction::FPToUI:
774  case Instruction::FPToSI:
775  default: llvm_unreachable("FIXME: Don't support this constant cast expr");
776  case Instruction::GetElementPtr: {
777    const TargetData &TD = *AP.TM.getTargetData();
778    // Generate a symbolic expression for the byte address
779    const Constant *PtrVal = CE->getOperand(0);
780    SmallVector<Value*, 8> IdxVec(CE->op_begin()+1, CE->op_end());
781    int64_t Offset = TD.getIndexedOffset(PtrVal->getType(), &IdxVec[0],
782                                         IdxVec.size());
783
784    const MCExpr *Base = LowerConstant(CE->getOperand(0), AP);
785    if (Offset == 0)
786      return Base;
787
788    // Truncate/sext the offset to the pointer size.
789    if (TD.getPointerSizeInBits() != 64) {
790      int SExtAmount = 64-TD.getPointerSizeInBits();
791      Offset = (Offset << SExtAmount) >> SExtAmount;
792    }
793
794    return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx),
795                                   Ctx);
796  }
797
798  case Instruction::Trunc:
799    // We emit the value and depend on the assembler to truncate the generated
800    // expression properly.  This is important for differences between
801    // blockaddress labels.  Since the two labels are in the same function, it
802    // is reasonable to treat their delta as a 32-bit value.
803    // FALL THROUGH.
804  case Instruction::BitCast:
805    return LowerConstant(CE->getOperand(0), AP);
806
807  case Instruction::IntToPtr: {
808    const TargetData &TD = *AP.TM.getTargetData();
809    // Handle casts to pointers by changing them into casts to the appropriate
810    // integer type.  This promotes constant folding and simplifies this code.
811    Constant *Op = CE->getOperand(0);
812    Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()),
813                                      false/*ZExt*/);
814    return LowerConstant(Op, AP);
815  }
816
817  case Instruction::PtrToInt: {
818    const TargetData &TD = *AP.TM.getTargetData();
819    // Support only foldable casts to/from pointers that can be eliminated by
820    // changing the pointer to the appropriately sized integer type.
821    Constant *Op = CE->getOperand(0);
822    const Type *Ty = CE->getType();
823
824    const MCExpr *OpExpr = LowerConstant(Op, AP);
825
826    // We can emit the pointer value into this slot if the slot is an
827    // integer slot equal to the size of the pointer.
828    if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType()))
829      return OpExpr;
830
831    // Otherwise the pointer is smaller than the resultant integer, mask off
832    // the high bits so we are sure to get a proper truncation if the input is
833    // a constant expr.
834    unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType());
835    const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx);
836    return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx);
837  }
838
839  case Instruction::Add:
840  case Instruction::Sub:
841  case Instruction::And:
842  case Instruction::Or:
843  case Instruction::Xor: {
844    const MCExpr *LHS = LowerConstant(CE->getOperand(0), AP);
845    const MCExpr *RHS = LowerConstant(CE->getOperand(1), AP);
846    switch (CE->getOpcode()) {
847    default: llvm_unreachable("Unknown binary operator constant cast expr");
848    case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx);
849    case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx);
850    case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx);
851    case Instruction::Or:  return MCBinaryExpr::CreateOr (LHS, RHS, Ctx);
852    case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx);
853    }
854  }
855  }
856}
857
858static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace,
859                                    AsmPrinter &AP) {
860  if (AddrSpace != 0 || !CA->isString()) {
861    // Not a string.  Print the values in successive locations
862    for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
863      AP.EmitGlobalConstant(CA->getOperand(i), AddrSpace);
864    return;
865  }
866
867  // Otherwise, it can be emitted as .ascii.
868  SmallVector<char, 128> TmpVec;
869  TmpVec.reserve(CA->getNumOperands());
870  for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
871    TmpVec.push_back(cast<ConstantInt>(CA->getOperand(i))->getZExtValue());
872
873  AP.OutStreamer.EmitBytes(StringRef(TmpVec.data(), TmpVec.size()), AddrSpace);
874}
875
876static void EmitGlobalConstantVector(const ConstantVector *CV,
877                                     unsigned AddrSpace, AsmPrinter &AP) {
878  for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
879    AP.EmitGlobalConstant(CV->getOperand(i), AddrSpace);
880}
881
882static void EmitGlobalConstantStruct(const ConstantStruct *CS,
883                                     unsigned AddrSpace, AsmPrinter &AP) {
884  // Print the fields in successive locations. Pad to align if needed!
885  const TargetData *TD = AP.TM.getTargetData();
886  unsigned Size = TD->getTypeAllocSize(CS->getType());
887  const StructLayout *Layout = TD->getStructLayout(CS->getType());
888  uint64_t SizeSoFar = 0;
889  for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
890    const Constant *Field = CS->getOperand(i);
891
892    // Check if padding is needed and insert one or more 0s.
893    uint64_t FieldSize = TD->getTypeAllocSize(Field->getType());
894    uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
895                        - Layout->getElementOffset(i)) - FieldSize;
896    SizeSoFar += FieldSize + PadSize;
897
898    // Now print the actual field value.
899    AP.EmitGlobalConstant(Field, AddrSpace);
900
901    // Insert padding - this may include padding to increase the size of the
902    // current field up to the ABI size (if the struct is not packed) as well
903    // as padding to ensure that the next field starts at the right offset.
904    AP.OutStreamer.EmitZeros(PadSize, AddrSpace);
905  }
906  assert(SizeSoFar == Layout->getSizeInBytes() &&
907         "Layout of constant struct may be incorrect!");
908}
909
910static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace,
911                                 AsmPrinter &AP) {
912  // FP Constants are printed as integer constants to avoid losing
913  // precision.
914  if (CFP->getType()->isDoubleTy()) {
915    if (AP.VerboseAsm) {
916      double Val = CFP->getValueAPF().convertToDouble();
917      AP.OutStreamer.GetCommentOS() << "double " << Val << '\n';
918    }
919
920    uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
921    AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
922    return;
923  }
924
925  if (CFP->getType()->isFloatTy()) {
926    if (AP.VerboseAsm) {
927      float Val = CFP->getValueAPF().convertToFloat();
928      AP.OutStreamer.GetCommentOS() << "float " << Val << '\n';
929    }
930    uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
931    AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace);
932    return;
933  }
934
935  if (CFP->getType()->isX86_FP80Ty()) {
936    // all long double variants are printed as hex
937    // api needed to prevent premature destruction
938    APInt API = CFP->getValueAPF().bitcastToAPInt();
939    const uint64_t *p = API.getRawData();
940    if (AP.VerboseAsm) {
941      // Convert to double so we can print the approximate val as a comment.
942      APFloat DoubleVal = CFP->getValueAPF();
943      bool ignored;
944      DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
945                        &ignored);
946      AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= "
947        << DoubleVal.convertToDouble() << '\n';
948    }
949
950    if (AP.TM.getTargetData()->isBigEndian()) {
951      AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
952      AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
953    } else {
954      AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
955      AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
956    }
957
958    // Emit the tail padding for the long double.
959    const TargetData &TD = *AP.TM.getTargetData();
960    AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) -
961                             TD.getTypeStoreSize(CFP->getType()), AddrSpace);
962    return;
963  }
964
965  assert(CFP->getType()->isPPC_FP128Ty() &&
966         "Floating point constant type not handled");
967  // All long double variants are printed as hex api needed to prevent
968  // premature destruction.
969  APInt API = CFP->getValueAPF().bitcastToAPInt();
970  const uint64_t *p = API.getRawData();
971  if (AP.TM.getTargetData()->isBigEndian()) {
972    AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
973    AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
974  } else {
975    AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
976    AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
977  }
978}
979
980static void EmitGlobalConstantLargeInt(const ConstantInt *CI,
981                                       unsigned AddrSpace, AsmPrinter &AP) {
982  const TargetData *TD = AP.TM.getTargetData();
983  unsigned BitWidth = CI->getBitWidth();
984  assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
985
986  // We don't expect assemblers to support integer data directives
987  // for more than 64 bits, so we emit the data in at most 64-bit
988  // quantities at a time.
989  const uint64_t *RawData = CI->getValue().getRawData();
990  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
991    uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i];
992    AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
993  }
994}
995
996/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
997void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
998  if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) {
999    uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1000    return OutStreamer.EmitZeros(Size, AddrSpace);
1001  }
1002
1003  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1004    unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1005    switch (Size) {
1006    case 1:
1007    case 2:
1008    case 4:
1009    case 8:
1010      if (VerboseAsm)
1011        OutStreamer.GetCommentOS() << format("0x%llx\n", CI->getZExtValue());
1012      OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace);
1013      return;
1014    default:
1015      EmitGlobalConstantLargeInt(CI, AddrSpace, *this);
1016      return;
1017    }
1018  }
1019
1020  if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
1021    return EmitGlobalConstantArray(CVA, AddrSpace, *this);
1022
1023  if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
1024    return EmitGlobalConstantStruct(CVS, AddrSpace, *this);
1025
1026  if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
1027    return EmitGlobalConstantFP(CFP, AddrSpace, *this);
1028
1029  if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
1030    return EmitGlobalConstantVector(V, AddrSpace, *this);
1031
1032  if (isa<ConstantPointerNull>(CV)) {
1033    unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1034    OutStreamer.EmitIntValue(0, Size, AddrSpace);
1035    return;
1036  }
1037
1038  // Otherwise, it must be a ConstantExpr.  Lower it to an MCExpr, then emit it
1039  // thread the streamer with EmitValue.
1040  OutStreamer.EmitValue(LowerConstant(CV, *this),
1041                        TM.getTargetData()->getTypeAllocSize(CV->getType()),
1042                        AddrSpace);
1043}
1044
1045void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1046  // Target doesn't support this yet!
1047  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1048}
1049
1050/// PrintSpecial - Print information related to the specified machine instr
1051/// that is independent of the operand, and may be independent of the instr
1052/// itself.  This can be useful for portably encoding the comment character
1053/// or other bits of target-specific knowledge into the asmstrings.  The
1054/// syntax used is ${:comment}.  Targets can override this to add support
1055/// for their own strange codes.
1056void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1057  if (!strcmp(Code, "private")) {
1058    O << MAI->getPrivateGlobalPrefix();
1059  } else if (!strcmp(Code, "comment")) {
1060    if (VerboseAsm)
1061      O << MAI->getCommentString();
1062  } else if (!strcmp(Code, "uid")) {
1063    // Comparing the address of MI isn't sufficient, because machineinstrs may
1064    // be allocated to the same address across functions.
1065    const Function *ThisF = MI->getParent()->getParent()->getFunction();
1066
1067    // If this is a new LastFn instruction, bump the counter.
1068    if (LastMI != MI || LastFn != ThisF) {
1069      ++Counter;
1070      LastMI = MI;
1071      LastFn = ThisF;
1072    }
1073    O << Counter;
1074  } else {
1075    std::string msg;
1076    raw_string_ostream Msg(msg);
1077    Msg << "Unknown special formatter '" << Code
1078         << "' for machine instr: " << *MI;
1079    llvm_report_error(Msg.str());
1080  }
1081}
1082
1083/// processDebugLoc - Processes the debug information of each machine
1084/// instruction's DebugLoc.
1085void AsmPrinter::processDebugLoc(const MachineInstr *MI,
1086                                 bool BeforePrintingInsn) {
1087  if (!MAI || !DW || !MAI->doesSupportDebugInformation()
1088      || !DW->ShouldEmitDwarfDebug())
1089    return;
1090  DebugLoc DL = MI->getDebugLoc();
1091  if (DL.isUnknown())
1092    return;
1093  DILocation CurDLT = MF->getDILocation(DL);
1094  if (CurDLT.getScope().isNull())
1095    return;
1096
1097  if (!BeforePrintingInsn) {
1098    // After printing instruction
1099    DW->EndScope(MI);
1100  } else if (CurDLT.getNode() != PrevDLT) {
1101    unsigned L = DW->RecordSourceLine(CurDLT.getLineNumber(),
1102                                      CurDLT.getColumnNumber(),
1103                                      CurDLT.getScope().getNode());
1104    printLabel(L);
1105    O << '\n';
1106    DW->BeginScope(MI, L);
1107    PrevDLT = CurDLT.getNode();
1108  }
1109}
1110
1111
1112/// printInlineAsm - This method formats and prints the specified machine
1113/// instruction that is an inline asm.
1114void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1115  unsigned NumOperands = MI->getNumOperands();
1116
1117  // Count the number of register definitions.
1118  unsigned NumDefs = 0;
1119  for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1120       ++NumDefs)
1121    assert(NumDefs != NumOperands-1 && "No asm string?");
1122
1123  assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1124
1125  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1126  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1127
1128  O << '\t';
1129
1130  // If this asmstr is empty, just print the #APP/#NOAPP markers.
1131  // These are useful to see where empty asm's wound up.
1132  if (AsmStr[0] == 0) {
1133    O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1134    O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
1135    return;
1136  }
1137
1138  O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1139
1140  // The variant of the current asmprinter.
1141  int AsmPrinterVariant = MAI->getAssemblerDialect();
1142
1143  int CurVariant = -1;            // The number of the {.|.|.} region we are in.
1144  const char *LastEmitted = AsmStr; // One past the last character emitted.
1145
1146  while (*LastEmitted) {
1147    switch (*LastEmitted) {
1148    default: {
1149      // Not a special case, emit the string section literally.
1150      const char *LiteralEnd = LastEmitted+1;
1151      while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1152             *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1153        ++LiteralEnd;
1154      if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1155        O.write(LastEmitted, LiteralEnd-LastEmitted);
1156      LastEmitted = LiteralEnd;
1157      break;
1158    }
1159    case '\n':
1160      ++LastEmitted;   // Consume newline character.
1161      O << '\n';       // Indent code with newline.
1162      break;
1163    case '$': {
1164      ++LastEmitted;   // Consume '$' character.
1165      bool Done = true;
1166
1167      // Handle escapes.
1168      switch (*LastEmitted) {
1169      default: Done = false; break;
1170      case '$':     // $$ -> $
1171        if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1172          O << '$';
1173        ++LastEmitted;  // Consume second '$' character.
1174        break;
1175      case '(':             // $( -> same as GCC's { character.
1176        ++LastEmitted;      // Consume '(' character.
1177        if (CurVariant != -1) {
1178          llvm_report_error("Nested variants found in inline asm string: '"
1179                            + std::string(AsmStr) + "'");
1180        }
1181        CurVariant = 0;     // We're in the first variant now.
1182        break;
1183      case '|':
1184        ++LastEmitted;  // consume '|' character.
1185        if (CurVariant == -1)
1186          O << '|';       // this is gcc's behavior for | outside a variant
1187        else
1188          ++CurVariant;   // We're in the next variant.
1189        break;
1190      case ')':         // $) -> same as GCC's } char.
1191        ++LastEmitted;  // consume ')' character.
1192        if (CurVariant == -1)
1193          O << '}';     // this is gcc's behavior for } outside a variant
1194        else
1195          CurVariant = -1;
1196        break;
1197      }
1198      if (Done) break;
1199
1200      bool HasCurlyBraces = false;
1201      if (*LastEmitted == '{') {     // ${variable}
1202        ++LastEmitted;               // Consume '{' character.
1203        HasCurlyBraces = true;
1204      }
1205
1206      // If we have ${:foo}, then this is not a real operand reference, it is a
1207      // "magic" string reference, just like in .td files.  Arrange to call
1208      // PrintSpecial.
1209      if (HasCurlyBraces && *LastEmitted == ':') {
1210        ++LastEmitted;
1211        const char *StrStart = LastEmitted;
1212        const char *StrEnd = strchr(StrStart, '}');
1213        if (StrEnd == 0) {
1214          llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1215                            + std::string(AsmStr) + "'");
1216        }
1217
1218        std::string Val(StrStart, StrEnd);
1219        PrintSpecial(MI, Val.c_str());
1220        LastEmitted = StrEnd+1;
1221        break;
1222      }
1223
1224      const char *IDStart = LastEmitted;
1225      char *IDEnd;
1226      errno = 0;
1227      long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1228      if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1229        llvm_report_error("Bad $ operand number in inline asm string: '"
1230                          + std::string(AsmStr) + "'");
1231      }
1232      LastEmitted = IDEnd;
1233
1234      char Modifier[2] = { 0, 0 };
1235
1236      if (HasCurlyBraces) {
1237        // If we have curly braces, check for a modifier character.  This
1238        // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1239        if (*LastEmitted == ':') {
1240          ++LastEmitted;    // Consume ':' character.
1241          if (*LastEmitted == 0) {
1242            llvm_report_error("Bad ${:} expression in inline asm string: '"
1243                              + std::string(AsmStr) + "'");
1244          }
1245
1246          Modifier[0] = *LastEmitted;
1247          ++LastEmitted;    // Consume modifier character.
1248        }
1249
1250        if (*LastEmitted != '}') {
1251          llvm_report_error("Bad ${} expression in inline asm string: '"
1252                            + std::string(AsmStr) + "'");
1253        }
1254        ++LastEmitted;    // Consume '}' character.
1255      }
1256
1257      if ((unsigned)Val >= NumOperands-1) {
1258        llvm_report_error("Invalid $ operand number in inline asm string: '"
1259                          + std::string(AsmStr) + "'");
1260      }
1261
1262      // Okay, we finally have a value number.  Ask the target to print this
1263      // operand!
1264      if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1265        unsigned OpNo = 1;
1266
1267        bool Error = false;
1268
1269        // Scan to find the machine operand number for the operand.
1270        for (; Val; --Val) {
1271          if (OpNo >= MI->getNumOperands()) break;
1272          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1273          OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1274        }
1275
1276        if (OpNo >= MI->getNumOperands()) {
1277          Error = true;
1278        } else {
1279          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1280          ++OpNo;  // Skip over the ID number.
1281
1282          if (Modifier[0] == 'l')  // labels are target independent
1283            O << *GetMBBSymbol(MI->getOperand(OpNo).getMBB()->getNumber());
1284          else {
1285            AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1286            if ((OpFlags & 7) == 4) {
1287              Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1288                                                Modifier[0] ? Modifier : 0);
1289            } else {
1290              Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1291                                          Modifier[0] ? Modifier : 0);
1292            }
1293          }
1294        }
1295        if (Error) {
1296          std::string msg;
1297          raw_string_ostream Msg(msg);
1298          Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n";
1299          MI->print(Msg);
1300          llvm_report_error(Msg.str());
1301        }
1302      }
1303      break;
1304    }
1305    }
1306  }
1307  O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd();
1308}
1309
1310/// printImplicitDef - This method prints the specified machine instruction
1311/// that is an implicit def.
1312void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1313  if (!VerboseAsm) return;
1314  O.PadToColumn(MAI->getCommentColumn());
1315  O << MAI->getCommentString() << " implicit-def: "
1316    << TRI->getName(MI->getOperand(0).getReg());
1317}
1318
1319void AsmPrinter::printKill(const MachineInstr *MI) const {
1320  if (!VerboseAsm) return;
1321  O.PadToColumn(MAI->getCommentColumn());
1322  O << MAI->getCommentString() << " kill:";
1323  for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) {
1324    const MachineOperand &op = MI->getOperand(n);
1325    assert(op.isReg() && "KILL instruction must have only register operands");
1326    O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>");
1327  }
1328}
1329
1330/// printLabel - This method prints a local label used by debug and
1331/// exception handling tables.
1332void AsmPrinter::printLabel(const MachineInstr *MI) const {
1333  printLabel(MI->getOperand(0).getImm());
1334}
1335
1336void AsmPrinter::printLabel(unsigned Id) const {
1337  O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':';
1338}
1339
1340/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1341/// instruction, using the specified assembler variant.  Targets should
1342/// override this to format as appropriate.
1343bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1344                                 unsigned AsmVariant, const char *ExtraCode) {
1345  // Target doesn't support this yet!
1346  return true;
1347}
1348
1349bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1350                                       unsigned AsmVariant,
1351                                       const char *ExtraCode) {
1352  // Target doesn't support this yet!
1353  return true;
1354}
1355
1356MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA,
1357                                            const char *Suffix) const {
1358  return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock(), Suffix);
1359}
1360
1361MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F,
1362                                            const BasicBlock *BB,
1363                                            const char *Suffix) const {
1364  assert(BB->hasName() &&
1365         "Address of anonymous basic block not supported yet!");
1366
1367  // This code must use the function name itself, and not the function number,
1368  // since it must be possible to generate the label name from within other
1369  // functions.
1370  SmallString<60> FnName;
1371  Mang->getNameWithPrefix(FnName, F, false);
1372
1373  // FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME!
1374  SmallString<60> NameResult;
1375  Mang->getNameWithPrefix(NameResult,
1376                          StringRef("BA") + Twine((unsigned)FnName.size()) +
1377                          "_" + FnName.str() + "_" + BB->getName() + Suffix,
1378                          Mangler::Private);
1379
1380  return OutContext.GetOrCreateSymbol(NameResult.str());
1381}
1382
1383MCSymbol *AsmPrinter::GetMBBSymbol(unsigned MBBID) const {
1384  SmallString<60> Name;
1385  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "BB"
1386    << getFunctionNumber() << '_' << MBBID;
1387  return OutContext.GetOrCreateSymbol(Name.str());
1388}
1389
1390/// GetCPISymbol - Return the symbol for the specified constant pool entry.
1391MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
1392  SmallString<60> Name;
1393  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI"
1394    << getFunctionNumber() << '_' << CPID;
1395  return OutContext.GetOrCreateSymbol(Name.str());
1396}
1397
1398/// GetJTISymbol - Return the symbol for the specified jump table entry.
1399MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
1400  const char *Prefix = isLinkerPrivate ? MAI->getLinkerPrivateGlobalPrefix() :
1401                                         MAI->getPrivateGlobalPrefix();
1402  SmallString<60> Name;
1403  raw_svector_ostream(Name) << Prefix << "JTI" << getFunctionNumber() << '_'
1404    << JTID;
1405  return OutContext.GetOrCreateSymbol(Name.str());
1406}
1407
1408/// GetJTSetSymbol - Return the symbol for the specified jump table .set
1409/// FIXME: privatize to AsmPrinter.
1410MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
1411  SmallString<60> Name;
1412  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix()
1413    << getFunctionNumber() << '_' << UID << "_set_" << MBBID;
1414  return OutContext.GetOrCreateSymbol(Name.str());
1415}
1416
1417/// GetGlobalValueSymbol - Return the MCSymbol for the specified global
1418/// value.
1419MCSymbol *AsmPrinter::GetGlobalValueSymbol(const GlobalValue *GV) const {
1420  SmallString<60> NameStr;
1421  Mang->getNameWithPrefix(NameStr, GV, false);
1422  return OutContext.GetOrCreateSymbol(NameStr.str());
1423}
1424
1425/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
1426/// global value name as its base, with the specified suffix, and where the
1427/// symbol is forced to have private linkage if ForcePrivate is true.
1428MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
1429                                                   StringRef Suffix,
1430                                                   bool ForcePrivate) const {
1431  SmallString<60> NameStr;
1432  Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
1433  NameStr.append(Suffix.begin(), Suffix.end());
1434  return OutContext.GetOrCreateSymbol(NameStr.str());
1435}
1436
1437/// GetExternalSymbolSymbol - Return the MCSymbol for the specified
1438/// ExternalSymbol.
1439MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
1440  SmallString<60> NameStr;
1441  Mang->getNameWithPrefix(NameStr, Sym);
1442  return OutContext.GetOrCreateSymbol(NameStr.str());
1443}
1444
1445
1446
1447/// PrintParentLoopComment - Print comments about parent loops of this one.
1448static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1449                                   unsigned FunctionNumber) {
1450  if (Loop == 0) return;
1451  PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
1452  OS.indent(Loop->getLoopDepth()*2)
1453    << "Parent Loop BB" << FunctionNumber << "_"
1454    << Loop->getHeader()->getNumber()
1455    << " Depth=" << Loop->getLoopDepth() << '\n';
1456}
1457
1458
1459/// PrintChildLoopComment - Print comments about child loops within
1460/// the loop for this basic block, with nesting.
1461static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1462                                  unsigned FunctionNumber) {
1463  // Add child loop information
1464  for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
1465    OS.indent((*CL)->getLoopDepth()*2)
1466      << "Child Loop BB" << FunctionNumber << "_"
1467      << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
1468      << '\n';
1469    PrintChildLoopComment(OS, *CL, FunctionNumber);
1470  }
1471}
1472
1473/// EmitComments - Pretty-print comments for basic blocks.
1474static void PrintBasicBlockLoopComments(const MachineBasicBlock &MBB,
1475                                        const MachineLoopInfo *LI,
1476                                        const AsmPrinter &AP) {
1477  // Add loop depth information
1478  const MachineLoop *Loop = LI->getLoopFor(&MBB);
1479  if (Loop == 0) return;
1480
1481  MachineBasicBlock *Header = Loop->getHeader();
1482  assert(Header && "No header for loop");
1483
1484  // If this block is not a loop header, just print out what is the loop header
1485  // and return.
1486  if (Header != &MBB) {
1487    AP.OutStreamer.AddComment("  in Loop: Header=BB" +
1488                              Twine(AP.getFunctionNumber())+"_" +
1489                              Twine(Loop->getHeader()->getNumber())+
1490                              " Depth="+Twine(Loop->getLoopDepth()));
1491    return;
1492  }
1493
1494  // Otherwise, it is a loop header.  Print out information about child and
1495  // parent loops.
1496  raw_ostream &OS = AP.OutStreamer.GetCommentOS();
1497
1498  PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
1499
1500  OS << "=>";
1501  OS.indent(Loop->getLoopDepth()*2-2);
1502
1503  OS << "This ";
1504  if (Loop->empty())
1505    OS << "Inner ";
1506  OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
1507
1508  PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
1509}
1510
1511
1512/// EmitBasicBlockStart - This method prints the label for the specified
1513/// MachineBasicBlock, an alignment (if present) and a comment describing
1514/// it if appropriate.
1515void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
1516  // Emit an alignment directive for this block, if needed.
1517  if (unsigned Align = MBB->getAlignment())
1518    EmitAlignment(Log2_32(Align));
1519
1520  // If the block has its address taken, emit a special label to satisfy
1521  // references to the block. This is done so that we don't need to
1522  // remember the number of this label, and so that we can make
1523  // forward references to labels without knowing what their numbers
1524  // will be.
1525  if (MBB->hasAddressTaken()) {
1526    const BasicBlock *BB = MBB->getBasicBlock();
1527    if (VerboseAsm)
1528      OutStreamer.AddComment("Address Taken");
1529    OutStreamer.EmitLabel(GetBlockAddressSymbol(BB->getParent(), BB));
1530  }
1531
1532  // Print the main label for the block.
1533  if (MBB->pred_empty() || MBB->isOnlyReachableByFallthrough()) {
1534    if (VerboseAsm) {
1535      // NOTE: Want this comment at start of line.
1536      O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':';
1537      if (const BasicBlock *BB = MBB->getBasicBlock())
1538        if (BB->hasName())
1539          OutStreamer.AddComment("%" + BB->getName());
1540
1541      PrintBasicBlockLoopComments(*MBB, LI, *this);
1542      OutStreamer.AddBlankLine();
1543    }
1544  } else {
1545    if (VerboseAsm) {
1546      if (const BasicBlock *BB = MBB->getBasicBlock())
1547        if (BB->hasName())
1548          OutStreamer.AddComment("%" + BB->getName());
1549      PrintBasicBlockLoopComments(*MBB, LI, *this);
1550    }
1551
1552    OutStreamer.EmitLabel(GetMBBSymbol(MBB->getNumber()));
1553  }
1554}
1555
1556/// printPICJumpTableSetLabel - This method prints a set label for the
1557/// specified MachineBasicBlock for a jumptable entry.
1558void AsmPrinter::printPICJumpTableSetLabel(unsigned uid,
1559                                           const MachineBasicBlock *MBB) const {
1560  if (!MAI->getSetDirective())
1561    return;
1562
1563  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1564    << *GetJTSetSymbol(uid, MBB->getNumber()) << ','
1565    << *GetMBBSymbol(MBB->getNumber()) << '-' << *GetJTISymbol(uid) << '\n';
1566}
1567
1568void AsmPrinter::printVisibility(MCSymbol *Sym, unsigned Visibility) const {
1569  MCSymbolAttr Attr = MCSA_Invalid;
1570
1571  switch (Visibility) {
1572  default: break;
1573  case GlobalValue::HiddenVisibility:
1574    Attr = MAI->getHiddenVisibilityAttr();
1575    break;
1576  case GlobalValue::ProtectedVisibility:
1577    Attr = MAI->getProtectedVisibilityAttr();
1578    break;
1579  }
1580
1581  if (Attr != MCSA_Invalid)
1582    OutStreamer.EmitSymbolAttribute(Sym, Attr);
1583}
1584
1585void AsmPrinter::printOffset(int64_t Offset) const {
1586  if (Offset > 0)
1587    O << '+' << Offset;
1588  else if (Offset < 0)
1589    O << Offset;
1590}
1591
1592GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1593  if (!S->usesMetadata())
1594    return 0;
1595
1596  gcp_iterator GCPI = GCMetadataPrinters.find(S);
1597  if (GCPI != GCMetadataPrinters.end())
1598    return GCPI->second;
1599
1600  const char *Name = S->getName().c_str();
1601
1602  for (GCMetadataPrinterRegistry::iterator
1603         I = GCMetadataPrinterRegistry::begin(),
1604         E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1605    if (strcmp(Name, I->getName()) == 0) {
1606      GCMetadataPrinter *GMP = I->instantiate();
1607      GMP->S = S;
1608      GCMetadataPrinters.insert(std::make_pair(S, GMP));
1609      return GMP;
1610    }
1611
1612  llvm_report_error("no GCMetadataPrinter registered for GC: " + Twine(Name));
1613  return 0;
1614}
1615
1616/// EmitComments - Pretty-print comments for instructions
1617void AsmPrinter::EmitComments(const MachineInstr &MI) const {
1618  if (!VerboseAsm)
1619    return;
1620
1621  bool Newline = false;
1622
1623  if (!MI.getDebugLoc().isUnknown()) {
1624    DILocation DLT = MF->getDILocation(MI.getDebugLoc());
1625
1626    // Print source line info.
1627    O.PadToColumn(MAI->getCommentColumn());
1628    O << MAI->getCommentString() << ' ';
1629    DIScope Scope = DLT.getScope();
1630    // Omit the directory, because it's likely to be long and uninteresting.
1631    if (!Scope.isNull())
1632      O << Scope.getFilename();
1633    else
1634      O << "<unknown>";
1635    O << ':' << DLT.getLineNumber();
1636    if (DLT.getColumnNumber() != 0)
1637      O << ':' << DLT.getColumnNumber();
1638    Newline = true;
1639  }
1640
1641  // Check for spills and reloads
1642  int FI;
1643
1644  const MachineFrameInfo *FrameInfo =
1645    MI.getParent()->getParent()->getFrameInfo();
1646
1647  // We assume a single instruction only has a spill or reload, not
1648  // both.
1649  const MachineMemOperand *MMO;
1650  if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
1651    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1652      MMO = *MI.memoperands_begin();
1653      if (Newline) O << '\n';
1654      O.PadToColumn(MAI->getCommentColumn());
1655      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Reload";
1656      Newline = true;
1657    }
1658  }
1659  else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
1660    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1661      if (Newline) O << '\n';
1662      O.PadToColumn(MAI->getCommentColumn());
1663      O << MAI->getCommentString() << ' '
1664        << MMO->getSize() << "-byte Folded Reload";
1665      Newline = true;
1666    }
1667  }
1668  else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
1669    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1670      MMO = *MI.memoperands_begin();
1671      if (Newline) O << '\n';
1672      O.PadToColumn(MAI->getCommentColumn());
1673      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Spill";
1674      Newline = true;
1675    }
1676  }
1677  else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
1678    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1679      if (Newline) O << '\n';
1680      O.PadToColumn(MAI->getCommentColumn());
1681      O << MAI->getCommentString() << ' '
1682        << MMO->getSize() << "-byte Folded Spill";
1683      Newline = true;
1684    }
1685  }
1686
1687  // Check for spill-induced copies
1688  unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
1689  if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg,
1690                                      SrcSubIdx, DstSubIdx)) {
1691    if (MI.getAsmPrinterFlag(ReloadReuse)) {
1692      if (Newline) O << '\n';
1693      O.PadToColumn(MAI->getCommentColumn());
1694      O << MAI->getCommentString() << " Reload Reuse";
1695    }
1696  }
1697}
1698
1699