AsmPrinter.cpp revision 1947f242d40227d36440a2702a0a612c8077d72e 
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  if (MAI->hasSingleParameterDotFile()) {
119    // Very minimal debug info. It is ignored if we emit actual
120    // debug info. If we don't, this at least helps the user find where
121    // a function came from.
122    O << "\t.file\t\"" << M.getModuleIdentifier() << "\"\n";
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    O << "\t.type\t" << *GVSym;
161    if (MAI->getCommentString()[0] != '@')
162      O << ",@object\n";
163    else
164      O << ",%object\n";
165  }
166
167  SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
168
169  const TargetData *TD = TM.getTargetData();
170  unsigned Size = TD->getTypeAllocSize(GV->getType()->getElementType());
171  unsigned AlignLog = TD->getPreferredAlignmentLog(GV);
172
173  // Handle common and BSS local symbols (.lcomm).
174  if (GVKind.isCommon() || GVKind.isBSSLocal()) {
175    if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
176
177    if (VerboseAsm) {
178      WriteAsOperand(OutStreamer.GetCommentOS(), GV,
179                     /*PrintType=*/false, GV->getParent());
180      OutStreamer.GetCommentOS() << '\n';
181    }
182
183    // Handle common symbols.
184    if (GVKind.isCommon()) {
185      // .comm _foo, 42, 4
186      OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
187      return;
188    }
189
190    // Handle local BSS symbols.
191    if (MAI->hasMachoZeroFillDirective()) {
192      const MCSection *TheSection =
193        getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
194      // .zerofill __DATA, __bss, _foo, 400, 5
195      OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
196      return;
197    }
198
199    if (MAI->hasLCOMMDirective()) {
200      // .lcomm _foo, 42
201      OutStreamer.EmitLocalCommonSymbol(GVSym, Size);
202      return;
203    }
204
205    // .local _foo
206    OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Local);
207    // .comm _foo, 42, 4
208    OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
209    return;
210  }
211
212  const MCSection *TheSection =
213    getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
214
215  // Handle the zerofill directive on darwin, which is a special form of BSS
216  // emission.
217  if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
218    // .globl _foo
219    OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
220    // .zerofill __DATA, __common, _foo, 400, 5
221    OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
222    return;
223  }
224
225  OutStreamer.SwitchSection(TheSection);
226
227  // TODO: Factor into an 'emit linkage' thing that is shared with function
228  // bodies.
229  switch (GV->getLinkage()) {
230  case GlobalValue::CommonLinkage:
231  case GlobalValue::LinkOnceAnyLinkage:
232  case GlobalValue::LinkOnceODRLinkage:
233  case GlobalValue::WeakAnyLinkage:
234  case GlobalValue::WeakODRLinkage:
235  case GlobalValue::LinkerPrivateLinkage:
236    if (MAI->getWeakDefDirective() != 0) {
237      // .globl _foo
238      OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
239      // .weak_definition _foo
240      OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
241    } else if (const char *LinkOnce = MAI->getLinkOnceDirective()) {
242      // .globl _foo
243      OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
244      // .linkonce same_size
245      O << LinkOnce;
246    } else {
247      // .weak _foo
248      OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
249    }
250    break;
251  case GlobalValue::DLLExportLinkage:
252  case GlobalValue::AppendingLinkage:
253    // FIXME: appending linkage variables should go into a section of
254    // their name or something.  For now, just emit them as external.
255  case GlobalValue::ExternalLinkage:
256    // If external or appending, declare as a global symbol.
257    // .globl _foo
258    OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
259    break;
260  case GlobalValue::PrivateLinkage:
261  case GlobalValue::InternalLinkage:
262     break;
263  default:
264    llvm_unreachable("Unknown linkage type!");
265  }
266
267  EmitAlignment(AlignLog, GV);
268  if (VerboseAsm) {
269    WriteAsOperand(OutStreamer.GetCommentOS(), GV,
270                   /*PrintType=*/false, GV->getParent());
271    OutStreamer.GetCommentOS() << '\n';
272  }
273  OutStreamer.EmitLabel(GVSym);
274
275  EmitGlobalConstant(GV->getInitializer());
276
277  if (MAI->hasDotTypeDotSizeDirective())
278    // .size foo, 42
279    OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext));
280
281  OutStreamer.AddBlankLine();
282}
283
284
285bool AsmPrinter::doFinalization(Module &M) {
286  // Emit global variables.
287  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
288       I != E; ++I)
289    EmitGlobalVariable(I);
290
291  // Emit final debug information.
292  if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
293    DW->EndModule();
294
295  // If the target wants to know about weak references, print them all.
296  if (MAI->getWeakRefDirective()) {
297    // FIXME: This is not lazy, it would be nice to only print weak references
298    // to stuff that is actually used.  Note that doing so would require targets
299    // to notice uses in operands (due to constant exprs etc).  This should
300    // happen with the MC stuff eventually.
301
302    // Print out module-level global variables here.
303    for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
304         I != E; ++I) {
305      if (!I->hasExternalWeakLinkage()) continue;
306      OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(I),
307                                      MCSA_WeakReference);
308    }
309
310    for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
311      if (!I->hasExternalWeakLinkage()) continue;
312      OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(I),
313                                      MCSA_WeakReference);
314    }
315  }
316
317  if (MAI->getSetDirective()) {
318    OutStreamer.AddBlankLine();
319    for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
320         I != E; ++I) {
321      MCSymbol *Name = GetGlobalValueSymbol(I);
322
323      const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
324      MCSymbol *Target = GetGlobalValueSymbol(GV);
325
326      if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
327        OutStreamer.EmitSymbolAttribute(Name, MCSA_Global);
328      else if (I->hasWeakLinkage())
329        OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference);
330      else
331        assert(I->hasLocalLinkage() && "Invalid alias linkage");
332
333      printVisibility(Name, I->getVisibility());
334
335      O << MAI->getSetDirective() << ' ' << *Name << ", " << *Target << '\n';
336    }
337  }
338
339  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
340  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
341  for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
342    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
343      MP->finishAssembly(O, *this, *MAI);
344
345  // If we don't have any trampolines, then we don't require stack memory
346  // to be executable. Some targets have a directive to declare this.
347  Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
348  if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
349    if (MCSection *S = MAI->getNonexecutableStackSection(OutContext))
350      OutStreamer.SwitchSection(S);
351
352  // Allow the target to emit any magic that it wants at the end of the file,
353  // after everything else has gone out.
354  EmitEndOfAsmFile(M);
355
356  delete Mang; Mang = 0;
357  DW = 0; MMI = 0;
358
359  OutStreamer.Finish();
360  return false;
361}
362
363void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
364  // Get the function symbol.
365  CurrentFnSym = GetGlobalValueSymbol(MF.getFunction());
366  IncrementFunctionNumber();
367
368  if (VerboseAsm)
369    LI = &getAnalysis<MachineLoopInfo>();
370}
371
372namespace {
373  // SectionCPs - Keep track the alignment, constpool entries per Section.
374  struct SectionCPs {
375    const MCSection *S;
376    unsigned Alignment;
377    SmallVector<unsigned, 4> CPEs;
378    SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
379  };
380}
381
382/// EmitConstantPool - Print to the current output stream assembly
383/// representations of the constants in the constant pool MCP. This is
384/// used to print out constants which have been "spilled to memory" by
385/// the code generator.
386///
387void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
388  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
389  if (CP.empty()) return;
390
391  // Calculate sections for constant pool entries. We collect entries to go into
392  // the same section together to reduce amount of section switch statements.
393  SmallVector<SectionCPs, 4> CPSections;
394  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
395    const MachineConstantPoolEntry &CPE = CP[i];
396    unsigned Align = CPE.getAlignment();
397
398    SectionKind Kind;
399    switch (CPE.getRelocationInfo()) {
400    default: llvm_unreachable("Unknown section kind");
401    case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
402    case 1:
403      Kind = SectionKind::getReadOnlyWithRelLocal();
404      break;
405    case 0:
406    switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
407    case 4:  Kind = SectionKind::getMergeableConst4(); break;
408    case 8:  Kind = SectionKind::getMergeableConst8(); break;
409    case 16: Kind = SectionKind::getMergeableConst16();break;
410    default: Kind = SectionKind::getMergeableConst(); break;
411    }
412    }
413
414    const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
415
416    // The number of sections are small, just do a linear search from the
417    // last section to the first.
418    bool Found = false;
419    unsigned SecIdx = CPSections.size();
420    while (SecIdx != 0) {
421      if (CPSections[--SecIdx].S == S) {
422        Found = true;
423        break;
424      }
425    }
426    if (!Found) {
427      SecIdx = CPSections.size();
428      CPSections.push_back(SectionCPs(S, Align));
429    }
430
431    if (Align > CPSections[SecIdx].Alignment)
432      CPSections[SecIdx].Alignment = Align;
433    CPSections[SecIdx].CPEs.push_back(i);
434  }
435
436  // Now print stuff into the calculated sections.
437  for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
438    OutStreamer.SwitchSection(CPSections[i].S);
439    EmitAlignment(Log2_32(CPSections[i].Alignment));
440
441    unsigned Offset = 0;
442    for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
443      unsigned CPI = CPSections[i].CPEs[j];
444      MachineConstantPoolEntry CPE = CP[CPI];
445
446      // Emit inter-object padding for alignment.
447      unsigned AlignMask = CPE.getAlignment() - 1;
448      unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
449      OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/);
450
451      const Type *Ty = CPE.getType();
452      Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
453
454      // Emit the label with a comment on it.
455      if (VerboseAsm) {
456        OutStreamer.GetCommentOS() << "constant pool ";
457        WriteTypeSymbolic(OutStreamer.GetCommentOS(), CPE.getType(),
458                          MF->getFunction()->getParent());
459        OutStreamer.GetCommentOS() << '\n';
460      }
461      OutStreamer.EmitLabel(GetCPISymbol(CPI));
462
463      if (CPE.isMachineConstantPoolEntry())
464        EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
465      else
466        EmitGlobalConstant(CPE.Val.ConstVal);
467    }
468  }
469}
470
471/// EmitJumpTableInfo - Print assembly representations of the jump tables used
472/// by the current function to the current output stream.
473///
474void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
475                                   MachineFunction &MF) {
476  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
477  if (JT.empty()) return;
478
479  bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
480
481  // Pick the directive to use to print the jump table entries, and switch to
482  // the appropriate section.
483  TargetLowering *LoweringInfo = TM.getTargetLowering();
484
485  const Function *F = MF.getFunction();
486  bool JTInDiffSection = false;
487  if (F->isWeakForLinker() ||
488      (IsPic && !LoweringInfo->usesGlobalOffsetTable())) {
489    // In PIC mode, we need to emit the jump table to the same section as the
490    // function body itself, otherwise the label differences won't make sense.
491    // We should also do if the section name is NULL or function is declared in
492    // discardable section.
493    OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang,
494                                                                    TM));
495  } else {
496    // Otherwise, drop it in the readonly section.
497    const MCSection *ReadOnlySection =
498      getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
499    OutStreamer.SwitchSection(ReadOnlySection);
500    JTInDiffSection = true;
501  }
502
503  EmitAlignment(Log2_32(MJTI->getAlignment()));
504
505  for (unsigned i = 0, e = JT.size(); i != e; ++i) {
506    const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
507
508    // If this jump table was deleted, ignore it.
509    if (JTBBs.empty()) continue;
510
511    // For PIC codegen, if possible we want to use the SetDirective to reduce
512    // the number of relocations the assembler will generate for the jump table.
513    // Set directives are all printed before the jump table itself.
514    SmallPtrSet<MachineBasicBlock*, 16> EmittedSets;
515    if (MAI->getSetDirective() && IsPic)
516      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
517        if (EmittedSets.insert(JTBBs[ii]))
518          printPICJumpTableSetLabel(i, JTBBs[ii]);
519
520    // On some targets (e.g. Darwin) we want to emit two consequtive labels
521    // before each jump table.  The first label is never referenced, but tells
522    // the assembler and linker the extents of the jump table object.  The
523    // second label is actually referenced by the code.
524    if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0])
525      OutStreamer.EmitLabel(GetJTISymbol(i, true));
526
527    OutStreamer.EmitLabel(GetJTISymbol(i));
528
529    for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
530      printPICJumpTableEntry(MJTI, JTBBs[ii], i);
531      O << '\n';
532    }
533  }
534}
535
536void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
537                                        const MachineBasicBlock *MBB,
538                                        unsigned uid)  const {
539  bool isPIC = TM.getRelocationModel() == Reloc::PIC_;
540
541  // Use JumpTableDirective otherwise honor the entry size from the jump table
542  // info.
543  const char *JTEntryDirective = MAI->getJumpTableDirective(isPIC);
544  bool HadJTEntryDirective = JTEntryDirective != NULL;
545  if (!HadJTEntryDirective) {
546    JTEntryDirective = MJTI->getEntrySize() == 4 ?
547      MAI->getData32bitsDirective() : MAI->getData64bitsDirective();
548  }
549
550  O << JTEntryDirective << ' ';
551
552  // If we have emitted set directives for the jump table entries, print
553  // them rather than the entries themselves.  If we're emitting PIC, then
554  // emit the table entries as differences between two text section labels.
555  // If we're emitting non-PIC code, then emit the entries as direct
556  // references to the target basic blocks.
557  if (!isPIC) {
558    O << *GetMBBSymbol(MBB->getNumber());
559  } else if (MAI->getSetDirective()) {
560    O << MAI->getPrivateGlobalPrefix() << getFunctionNumber()
561      << '_' << uid << "_set_" << MBB->getNumber();
562  } else {
563    O << *GetMBBSymbol(MBB->getNumber());
564    // If the arch uses custom Jump Table directives, don't calc relative to
565    // JT.
566    if (!HadJTEntryDirective)
567      O << '-' << *GetJTISymbol(uid);
568  }
569}
570
571
572/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
573/// special global used by LLVM.  If so, emit it and return true, otherwise
574/// do nothing and return false.
575bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
576  if (GV->getName() == "llvm.used") {
577    if (MAI->hasNoDeadStrip())    // No need to emit this at all.
578      EmitLLVMUsedList(GV->getInitializer());
579    return true;
580  }
581
582  // Ignore debug and non-emitted data.  This handles llvm.compiler.used.
583  if (GV->getSection() == "llvm.metadata" ||
584      GV->hasAvailableExternallyLinkage())
585    return true;
586
587  if (!GV->hasAppendingLinkage()) return false;
588
589  assert(GV->hasInitializer() && "Not a special LLVM global!");
590
591  const TargetData *TD = TM.getTargetData();
592  unsigned Align = Log2_32(TD->getPointerPrefAlignment());
593  if (GV->getName() == "llvm.global_ctors") {
594    OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
595    EmitAlignment(Align, 0);
596    EmitXXStructorList(GV->getInitializer());
597
598    if (TM.getRelocationModel() == Reloc::Static &&
599        MAI->hasStaticCtorDtorReferenceInStaticMode()) {
600      StringRef Sym(".constructors_used");
601      OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
602                                      MCSA_Reference);
603    }
604    return true;
605  }
606
607  if (GV->getName() == "llvm.global_dtors") {
608    OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
609    EmitAlignment(Align, 0);
610    EmitXXStructorList(GV->getInitializer());
611
612    if (TM.getRelocationModel() == Reloc::Static &&
613        MAI->hasStaticCtorDtorReferenceInStaticMode()) {
614      StringRef Sym(".destructors_used");
615      OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
616                                      MCSA_Reference);
617    }
618    return true;
619  }
620
621  return false;
622}
623
624/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
625/// global in the specified llvm.used list for which emitUsedDirectiveFor
626/// is true, as being used with this directive.
627void AsmPrinter::EmitLLVMUsedList(Constant *List) {
628  // Should be an array of 'i8*'.
629  ConstantArray *InitList = dyn_cast<ConstantArray>(List);
630  if (InitList == 0) return;
631
632  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
633    const GlobalValue *GV =
634      dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
635    if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang))
636      OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(GV),
637                                      MCSA_NoDeadStrip);
638  }
639}
640
641/// EmitXXStructorList - Emit the ctor or dtor list.  This just prints out the
642/// function pointers, ignoring the init priority.
643void AsmPrinter::EmitXXStructorList(Constant *List) {
644  // Should be an array of '{ int, void ()* }' structs.  The first value is the
645  // init priority, which we ignore.
646  if (!isa<ConstantArray>(List)) return;
647  ConstantArray *InitList = cast<ConstantArray>(List);
648  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
649    if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
650      if (CS->getNumOperands() != 2) return;  // Not array of 2-element structs.
651
652      if (CS->getOperand(1)->isNullValue())
653        return;  // Found a null terminator, exit printing.
654      // Emit the function pointer.
655      EmitGlobalConstant(CS->getOperand(1));
656    }
657}
658
659//===--------------------------------------------------------------------===//
660// Emission and print routines
661//
662
663/// EmitInt8 - Emit a byte directive and value.
664///
665void AsmPrinter::EmitInt8(int Value) const {
666  OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/);
667}
668
669/// EmitInt16 - Emit a short directive and value.
670///
671void AsmPrinter::EmitInt16(int Value) const {
672  OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/);
673}
674
675/// EmitInt32 - Emit a long directive and value.
676///
677void AsmPrinter::EmitInt32(int Value) const {
678  OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/);
679}
680
681/// EmitInt64 - Emit a long long directive and value.
682///
683void AsmPrinter::EmitInt64(uint64_t Value) const {
684  OutStreamer.EmitIntValue(Value, 8, 0/*addrspace*/);
685}
686
687
688/// toOctal - Convert the low order bits of X into an octal digit.
689///
690static inline char toOctal(int X) {
691  return (X&7)+'0';
692}
693
694/// printStringChar - Print a char, escaped if necessary.
695///
696static void printStringChar(formatted_raw_ostream &O, unsigned char C) {
697  if (C == '"') {
698    O << "\\\"";
699  } else if (C == '\\') {
700    O << "\\\\";
701  } else if (isprint((unsigned char)C)) {
702    O << C;
703  } else {
704    switch(C) {
705    case '\b': O << "\\b"; break;
706    case '\f': O << "\\f"; break;
707    case '\n': O << "\\n"; break;
708    case '\r': O << "\\r"; break;
709    case '\t': O << "\\t"; break;
710    default:
711      O << '\\';
712      O << toOctal(C >> 6);
713      O << toOctal(C >> 3);
714      O << toOctal(C >> 0);
715      break;
716    }
717  }
718}
719
720/// EmitFile - Emit a .file directive.
721void AsmPrinter::EmitFile(unsigned Number, StringRef Name) const {
722  O << "\t.file\t" << Number << " \"";
723  for (unsigned i = 0, N = Name.size(); i < N; ++i)
724    printStringChar(O, Name[i]);
725  O << '\"';
726}
727
728
729//===----------------------------------------------------------------------===//
730
731// EmitAlignment - Emit an alignment directive to the specified power of
732// two boundary.  For example, if you pass in 3 here, you will get an 8
733// byte alignment.  If a global value is specified, and if that global has
734// an explicit alignment requested, it will unconditionally override the
735// alignment request.  However, if ForcedAlignBits is specified, this value
736// has final say: the ultimate alignment will be the max of ForcedAlignBits
737// and the alignment computed with NumBits and the global.
738//
739// The algorithm is:
740//     Align = NumBits;
741//     if (GV && GV->hasalignment) Align = GV->getalignment();
742//     Align = std::max(Align, ForcedAlignBits);
743//
744void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
745                               unsigned ForcedAlignBits,
746                               bool UseFillExpr) const {
747  if (GV && GV->getAlignment())
748    NumBits = Log2_32(GV->getAlignment());
749  NumBits = std::max(NumBits, ForcedAlignBits);
750
751  if (NumBits == 0) return;   // No need to emit alignment.
752
753  unsigned FillValue = 0;
754  if (getCurrentSection()->getKind().isText())
755    FillValue = MAI->getTextAlignFillValue();
756
757  OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0);
758}
759
760/// LowerConstant - Lower the specified LLVM Constant to an MCExpr.
761///
762static const MCExpr *LowerConstant(const Constant *CV, AsmPrinter &AP) {
763  MCContext &Ctx = AP.OutContext;
764
765  if (CV->isNullValue() || isa<UndefValue>(CV))
766    return MCConstantExpr::Create(0, Ctx);
767
768  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
769    return MCConstantExpr::Create(CI->getZExtValue(), Ctx);
770
771  if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
772    return MCSymbolRefExpr::Create(AP.GetGlobalValueSymbol(GV), Ctx);
773  if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
774    return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx);
775
776  const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
777  if (CE == 0) {
778    llvm_unreachable("Unknown constant value to lower!");
779    return MCConstantExpr::Create(0, Ctx);
780  }
781
782  switch (CE->getOpcode()) {
783  case Instruction::ZExt:
784  case Instruction::SExt:
785  case Instruction::FPTrunc:
786  case Instruction::FPExt:
787  case Instruction::UIToFP:
788  case Instruction::SIToFP:
789  case Instruction::FPToUI:
790  case Instruction::FPToSI:
791  default: llvm_unreachable("FIXME: Don't support this constant cast expr");
792  case Instruction::GetElementPtr: {
793    const TargetData &TD = *AP.TM.getTargetData();
794    // Generate a symbolic expression for the byte address
795    const Constant *PtrVal = CE->getOperand(0);
796    SmallVector<Value*, 8> IdxVec(CE->op_begin()+1, CE->op_end());
797    int64_t Offset = TD.getIndexedOffset(PtrVal->getType(), &IdxVec[0],
798                                         IdxVec.size());
799
800    const MCExpr *Base = LowerConstant(CE->getOperand(0), AP);
801    if (Offset == 0)
802      return Base;
803
804    // Truncate/sext the offset to the pointer size.
805    if (TD.getPointerSizeInBits() != 64) {
806      int SExtAmount = 64-TD.getPointerSizeInBits();
807      Offset = (Offset << SExtAmount) >> SExtAmount;
808    }
809
810    return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx),
811                                   Ctx);
812  }
813
814  case Instruction::Trunc:
815    // We emit the value and depend on the assembler to truncate the generated
816    // expression properly.  This is important for differences between
817    // blockaddress labels.  Since the two labels are in the same function, it
818    // is reasonable to treat their delta as a 32-bit value.
819    // FALL THROUGH.
820  case Instruction::BitCast:
821    return LowerConstant(CE->getOperand(0), AP);
822
823  case Instruction::IntToPtr: {
824    const TargetData &TD = *AP.TM.getTargetData();
825    // Handle casts to pointers by changing them into casts to the appropriate
826    // integer type.  This promotes constant folding and simplifies this code.
827    Constant *Op = CE->getOperand(0);
828    Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()),
829                                      false/*ZExt*/);
830    return LowerConstant(Op, AP);
831  }
832
833  case Instruction::PtrToInt: {
834    const TargetData &TD = *AP.TM.getTargetData();
835    // Support only foldable casts to/from pointers that can be eliminated by
836    // changing the pointer to the appropriately sized integer type.
837    Constant *Op = CE->getOperand(0);
838    const Type *Ty = CE->getType();
839
840    const MCExpr *OpExpr = LowerConstant(Op, AP);
841
842    // We can emit the pointer value into this slot if the slot is an
843    // integer slot equal to the size of the pointer.
844    if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType()))
845      return OpExpr;
846
847    // Otherwise the pointer is smaller than the resultant integer, mask off
848    // the high bits so we are sure to get a proper truncation if the input is
849    // a constant expr.
850    unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType());
851    const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx);
852    return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx);
853  }
854
855  case Instruction::Add:
856  case Instruction::Sub:
857  case Instruction::And:
858  case Instruction::Or:
859  case Instruction::Xor: {
860    const MCExpr *LHS = LowerConstant(CE->getOperand(0), AP);
861    const MCExpr *RHS = LowerConstant(CE->getOperand(1), AP);
862    switch (CE->getOpcode()) {
863    default: llvm_unreachable("Unknown binary operator constant cast expr");
864    case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx);
865    case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx);
866    case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx);
867    case Instruction::Or:  return MCBinaryExpr::CreateOr (LHS, RHS, Ctx);
868    case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx);
869    }
870  }
871  }
872}
873
874static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace,
875                                    AsmPrinter &AP) {
876  if (AddrSpace != 0 || !CA->isString()) {
877    // Not a string.  Print the values in successive locations
878    for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
879      AP.EmitGlobalConstant(CA->getOperand(i), AddrSpace);
880    return;
881  }
882
883  // Otherwise, it can be emitted as .ascii.
884  SmallVector<char, 128> TmpVec;
885  TmpVec.reserve(CA->getNumOperands());
886  for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
887    TmpVec.push_back(cast<ConstantInt>(CA->getOperand(i))->getZExtValue());
888
889  AP.OutStreamer.EmitBytes(StringRef(TmpVec.data(), TmpVec.size()), AddrSpace);
890}
891
892static void EmitGlobalConstantVector(const ConstantVector *CV,
893                                     unsigned AddrSpace, AsmPrinter &AP) {
894  for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
895    AP.EmitGlobalConstant(CV->getOperand(i), AddrSpace);
896}
897
898static void EmitGlobalConstantStruct(const ConstantStruct *CS,
899                                     unsigned AddrSpace, AsmPrinter &AP) {
900  // Print the fields in successive locations. Pad to align if needed!
901  const TargetData *TD = AP.TM.getTargetData();
902  unsigned Size = TD->getTypeAllocSize(CS->getType());
903  const StructLayout *Layout = TD->getStructLayout(CS->getType());
904  uint64_t SizeSoFar = 0;
905  for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
906    const Constant *Field = CS->getOperand(i);
907
908    // Check if padding is needed and insert one or more 0s.
909    uint64_t FieldSize = TD->getTypeAllocSize(Field->getType());
910    uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
911                        - Layout->getElementOffset(i)) - FieldSize;
912    SizeSoFar += FieldSize + PadSize;
913
914    // Now print the actual field value.
915    AP.EmitGlobalConstant(Field, AddrSpace);
916
917    // Insert padding - this may include padding to increase the size of the
918    // current field up to the ABI size (if the struct is not packed) as well
919    // as padding to ensure that the next field starts at the right offset.
920    AP.OutStreamer.EmitZeros(PadSize, AddrSpace);
921  }
922  assert(SizeSoFar == Layout->getSizeInBytes() &&
923         "Layout of constant struct may be incorrect!");
924}
925
926static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace,
927                                 AsmPrinter &AP) {
928  // FP Constants are printed as integer constants to avoid losing
929  // precision.
930  if (CFP->getType()->isDoubleTy()) {
931    if (AP.VerboseAsm) {
932      double Val = CFP->getValueAPF().convertToDouble();
933      AP.OutStreamer.GetCommentOS() << "double " << Val << '\n';
934    }
935
936    uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
937    AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
938    return;
939  }
940
941  if (CFP->getType()->isFloatTy()) {
942    if (AP.VerboseAsm) {
943      float Val = CFP->getValueAPF().convertToFloat();
944      AP.OutStreamer.GetCommentOS() << "float " << Val << '\n';
945    }
946    uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
947    AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace);
948    return;
949  }
950
951  if (CFP->getType()->isX86_FP80Ty()) {
952    // all long double variants are printed as hex
953    // api needed to prevent premature destruction
954    APInt API = CFP->getValueAPF().bitcastToAPInt();
955    const uint64_t *p = API.getRawData();
956    if (AP.VerboseAsm) {
957      // Convert to double so we can print the approximate val as a comment.
958      APFloat DoubleVal = CFP->getValueAPF();
959      bool ignored;
960      DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
961                        &ignored);
962      AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= "
963        << DoubleVal.convertToDouble() << '\n';
964    }
965
966    if (AP.TM.getTargetData()->isBigEndian()) {
967      AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
968      AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
969    } else {
970      AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
971      AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
972    }
973
974    // Emit the tail padding for the long double.
975    const TargetData &TD = *AP.TM.getTargetData();
976    AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) -
977                             TD.getTypeStoreSize(CFP->getType()), AddrSpace);
978    return;
979  }
980
981  assert(CFP->getType()->isPPC_FP128Ty() &&
982         "Floating point constant type not handled");
983  // All long double variants are printed as hex api needed to prevent
984  // premature destruction.
985  APInt API = CFP->getValueAPF().bitcastToAPInt();
986  const uint64_t *p = API.getRawData();
987  if (AP.TM.getTargetData()->isBigEndian()) {
988    AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
989    AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
990  } else {
991    AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
992    AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
993  }
994}
995
996static void EmitGlobalConstantLargeInt(const ConstantInt *CI,
997                                       unsigned AddrSpace, AsmPrinter &AP) {
998  const TargetData *TD = AP.TM.getTargetData();
999  unsigned BitWidth = CI->getBitWidth();
1000  assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
1001
1002  // We don't expect assemblers to support integer data directives
1003  // for more than 64 bits, so we emit the data in at most 64-bit
1004  // quantities at a time.
1005  const uint64_t *RawData = CI->getValue().getRawData();
1006  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1007    uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i];
1008    AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1009  }
1010}
1011
1012/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1013void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1014  if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) {
1015    uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1016    return OutStreamer.EmitZeros(Size, AddrSpace);
1017  }
1018
1019  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1020    unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1021    switch (Size) {
1022    case 1:
1023    case 2:
1024    case 4:
1025    case 8:
1026      if (VerboseAsm)
1027        OutStreamer.GetCommentOS() << format("0x%llx\n", CI->getZExtValue());
1028      OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace);
1029      return;
1030    default:
1031      EmitGlobalConstantLargeInt(CI, AddrSpace, *this);
1032      return;
1033    }
1034  }
1035
1036  if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
1037    return EmitGlobalConstantArray(CVA, AddrSpace, *this);
1038
1039  if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
1040    return EmitGlobalConstantStruct(CVS, AddrSpace, *this);
1041
1042  if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
1043    return EmitGlobalConstantFP(CFP, AddrSpace, *this);
1044
1045  if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
1046    return EmitGlobalConstantVector(V, AddrSpace, *this);
1047
1048  if (isa<ConstantPointerNull>(CV)) {
1049    unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1050    OutStreamer.EmitIntValue(0, Size, AddrSpace);
1051    return;
1052  }
1053
1054  // Otherwise, it must be a ConstantExpr.  Lower it to an MCExpr, then emit it
1055  // thread the streamer with EmitValue.
1056  OutStreamer.EmitValue(LowerConstant(CV, *this),
1057                        TM.getTargetData()->getTypeAllocSize(CV->getType()),
1058                        AddrSpace);
1059}
1060
1061void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1062  // Target doesn't support this yet!
1063  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1064}
1065
1066/// PrintSpecial - Print information related to the specified machine instr
1067/// that is independent of the operand, and may be independent of the instr
1068/// itself.  This can be useful for portably encoding the comment character
1069/// or other bits of target-specific knowledge into the asmstrings.  The
1070/// syntax used is ${:comment}.  Targets can override this to add support
1071/// for their own strange codes.
1072void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1073  if (!strcmp(Code, "private")) {
1074    O << MAI->getPrivateGlobalPrefix();
1075  } else if (!strcmp(Code, "comment")) {
1076    if (VerboseAsm)
1077      O << MAI->getCommentString();
1078  } else if (!strcmp(Code, "uid")) {
1079    // Comparing the address of MI isn't sufficient, because machineinstrs may
1080    // be allocated to the same address across functions.
1081    const Function *ThisF = MI->getParent()->getParent()->getFunction();
1082
1083    // If this is a new LastFn instruction, bump the counter.
1084    if (LastMI != MI || LastFn != ThisF) {
1085      ++Counter;
1086      LastMI = MI;
1087      LastFn = ThisF;
1088    }
1089    O << Counter;
1090  } else {
1091    std::string msg;
1092    raw_string_ostream Msg(msg);
1093    Msg << "Unknown special formatter '" << Code
1094         << "' for machine instr: " << *MI;
1095    llvm_report_error(Msg.str());
1096  }
1097}
1098
1099/// processDebugLoc - Processes the debug information of each machine
1100/// instruction's DebugLoc.
1101void AsmPrinter::processDebugLoc(const MachineInstr *MI,
1102                                 bool BeforePrintingInsn) {
1103  if (!MAI || !DW || !MAI->doesSupportDebugInformation()
1104      || !DW->ShouldEmitDwarfDebug())
1105    return;
1106  DebugLoc DL = MI->getDebugLoc();
1107  if (DL.isUnknown())
1108    return;
1109  DILocation CurDLT = MF->getDILocation(DL);
1110  if (CurDLT.getScope().isNull())
1111    return;
1112
1113  if (!BeforePrintingInsn) {
1114    // After printing instruction
1115    DW->EndScope(MI);
1116  } else if (CurDLT.getNode() != PrevDLT) {
1117    unsigned L = DW->RecordSourceLine(CurDLT.getLineNumber(),
1118                                      CurDLT.getColumnNumber(),
1119                                      CurDLT.getScope().getNode());
1120    printLabel(L);
1121    O << '\n';
1122    DW->BeginScope(MI, L);
1123    PrevDLT = CurDLT.getNode();
1124  }
1125}
1126
1127
1128/// printInlineAsm - This method formats and prints the specified machine
1129/// instruction that is an inline asm.
1130void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1131  unsigned NumOperands = MI->getNumOperands();
1132
1133  // Count the number of register definitions.
1134  unsigned NumDefs = 0;
1135  for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1136       ++NumDefs)
1137    assert(NumDefs != NumOperands-1 && "No asm string?");
1138
1139  assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1140
1141  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1142  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1143
1144  O << '\t';
1145
1146  // If this asmstr is empty, just print the #APP/#NOAPP markers.
1147  // These are useful to see where empty asm's wound up.
1148  if (AsmStr[0] == 0) {
1149    O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1150    O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
1151    return;
1152  }
1153
1154  O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1155
1156  // The variant of the current asmprinter.
1157  int AsmPrinterVariant = MAI->getAssemblerDialect();
1158
1159  int CurVariant = -1;            // The number of the {.|.|.} region we are in.
1160  const char *LastEmitted = AsmStr; // One past the last character emitted.
1161
1162  while (*LastEmitted) {
1163    switch (*LastEmitted) {
1164    default: {
1165      // Not a special case, emit the string section literally.
1166      const char *LiteralEnd = LastEmitted+1;
1167      while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1168             *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1169        ++LiteralEnd;
1170      if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1171        O.write(LastEmitted, LiteralEnd-LastEmitted);
1172      LastEmitted = LiteralEnd;
1173      break;
1174    }
1175    case '\n':
1176      ++LastEmitted;   // Consume newline character.
1177      O << '\n';       // Indent code with newline.
1178      break;
1179    case '$': {
1180      ++LastEmitted;   // Consume '$' character.
1181      bool Done = true;
1182
1183      // Handle escapes.
1184      switch (*LastEmitted) {
1185      default: Done = false; break;
1186      case '$':     // $$ -> $
1187        if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1188          O << '$';
1189        ++LastEmitted;  // Consume second '$' character.
1190        break;
1191      case '(':             // $( -> same as GCC's { character.
1192        ++LastEmitted;      // Consume '(' character.
1193        if (CurVariant != -1) {
1194          llvm_report_error("Nested variants found in inline asm string: '"
1195                            + std::string(AsmStr) + "'");
1196        }
1197        CurVariant = 0;     // We're in the first variant now.
1198        break;
1199      case '|':
1200        ++LastEmitted;  // consume '|' character.
1201        if (CurVariant == -1)
1202          O << '|';       // this is gcc's behavior for | outside a variant
1203        else
1204          ++CurVariant;   // We're in the next variant.
1205        break;
1206      case ')':         // $) -> same as GCC's } char.
1207        ++LastEmitted;  // consume ')' character.
1208        if (CurVariant == -1)
1209          O << '}';     // this is gcc's behavior for } outside a variant
1210        else
1211          CurVariant = -1;
1212        break;
1213      }
1214      if (Done) break;
1215
1216      bool HasCurlyBraces = false;
1217      if (*LastEmitted == '{') {     // ${variable}
1218        ++LastEmitted;               // Consume '{' character.
1219        HasCurlyBraces = true;
1220      }
1221
1222      // If we have ${:foo}, then this is not a real operand reference, it is a
1223      // "magic" string reference, just like in .td files.  Arrange to call
1224      // PrintSpecial.
1225      if (HasCurlyBraces && *LastEmitted == ':') {
1226        ++LastEmitted;
1227        const char *StrStart = LastEmitted;
1228        const char *StrEnd = strchr(StrStart, '}');
1229        if (StrEnd == 0) {
1230          llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1231                            + std::string(AsmStr) + "'");
1232        }
1233
1234        std::string Val(StrStart, StrEnd);
1235        PrintSpecial(MI, Val.c_str());
1236        LastEmitted = StrEnd+1;
1237        break;
1238      }
1239
1240      const char *IDStart = LastEmitted;
1241      char *IDEnd;
1242      errno = 0;
1243      long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1244      if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1245        llvm_report_error("Bad $ operand number in inline asm string: '"
1246                          + std::string(AsmStr) + "'");
1247      }
1248      LastEmitted = IDEnd;
1249
1250      char Modifier[2] = { 0, 0 };
1251
1252      if (HasCurlyBraces) {
1253        // If we have curly braces, check for a modifier character.  This
1254        // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1255        if (*LastEmitted == ':') {
1256          ++LastEmitted;    // Consume ':' character.
1257          if (*LastEmitted == 0) {
1258            llvm_report_error("Bad ${:} expression in inline asm string: '"
1259                              + std::string(AsmStr) + "'");
1260          }
1261
1262          Modifier[0] = *LastEmitted;
1263          ++LastEmitted;    // Consume modifier character.
1264        }
1265
1266        if (*LastEmitted != '}') {
1267          llvm_report_error("Bad ${} expression in inline asm string: '"
1268                            + std::string(AsmStr) + "'");
1269        }
1270        ++LastEmitted;    // Consume '}' character.
1271      }
1272
1273      if ((unsigned)Val >= NumOperands-1) {
1274        llvm_report_error("Invalid $ operand number in inline asm string: '"
1275                          + std::string(AsmStr) + "'");
1276      }
1277
1278      // Okay, we finally have a value number.  Ask the target to print this
1279      // operand!
1280      if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1281        unsigned OpNo = 1;
1282
1283        bool Error = false;
1284
1285        // Scan to find the machine operand number for the operand.
1286        for (; Val; --Val) {
1287          if (OpNo >= MI->getNumOperands()) break;
1288          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1289          OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1290        }
1291
1292        if (OpNo >= MI->getNumOperands()) {
1293          Error = true;
1294        } else {
1295          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1296          ++OpNo;  // Skip over the ID number.
1297
1298          if (Modifier[0] == 'l')  // labels are target independent
1299            O << *GetMBBSymbol(MI->getOperand(OpNo).getMBB()->getNumber());
1300          else {
1301            AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1302            if ((OpFlags & 7) == 4) {
1303              Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1304                                                Modifier[0] ? Modifier : 0);
1305            } else {
1306              Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1307                                          Modifier[0] ? Modifier : 0);
1308            }
1309          }
1310        }
1311        if (Error) {
1312          std::string msg;
1313          raw_string_ostream Msg(msg);
1314          Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n";
1315          MI->print(Msg);
1316          llvm_report_error(Msg.str());
1317        }
1318      }
1319      break;
1320    }
1321    }
1322  }
1323  O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd();
1324}
1325
1326/// printImplicitDef - This method prints the specified machine instruction
1327/// that is an implicit def.
1328void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1329  if (!VerboseAsm) return;
1330  O.PadToColumn(MAI->getCommentColumn());
1331  O << MAI->getCommentString() << " implicit-def: "
1332    << TRI->getName(MI->getOperand(0).getReg());
1333}
1334
1335void AsmPrinter::printKill(const MachineInstr *MI) const {
1336  if (!VerboseAsm) return;
1337  O.PadToColumn(MAI->getCommentColumn());
1338  O << MAI->getCommentString() << " kill:";
1339  for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) {
1340    const MachineOperand &op = MI->getOperand(n);
1341    assert(op.isReg() && "KILL instruction must have only register operands");
1342    O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>");
1343  }
1344}
1345
1346/// printLabel - This method prints a local label used by debug and
1347/// exception handling tables.
1348void AsmPrinter::printLabel(const MachineInstr *MI) const {
1349  printLabel(MI->getOperand(0).getImm());
1350}
1351
1352void AsmPrinter::printLabel(unsigned Id) const {
1353  O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':';
1354}
1355
1356/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1357/// instruction, using the specified assembler variant.  Targets should
1358/// override this to format as appropriate.
1359bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1360                                 unsigned AsmVariant, const char *ExtraCode) {
1361  // Target doesn't support this yet!
1362  return true;
1363}
1364
1365bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1366                                       unsigned AsmVariant,
1367                                       const char *ExtraCode) {
1368  // Target doesn't support this yet!
1369  return true;
1370}
1371
1372MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA,
1373                                            const char *Suffix) const {
1374  return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock(), Suffix);
1375}
1376
1377MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F,
1378                                            const BasicBlock *BB,
1379                                            const char *Suffix) const {
1380  assert(BB->hasName() &&
1381         "Address of anonymous basic block not supported yet!");
1382
1383  // This code must use the function name itself, and not the function number,
1384  // since it must be possible to generate the label name from within other
1385  // functions.
1386  SmallString<60> FnName;
1387  Mang->getNameWithPrefix(FnName, F, false);
1388
1389  // FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME!
1390  SmallString<60> NameResult;
1391  Mang->getNameWithPrefix(NameResult,
1392                          StringRef("BA") + Twine((unsigned)FnName.size()) +
1393                          "_" + FnName.str() + "_" + BB->getName() + Suffix,
1394                          Mangler::Private);
1395
1396  return OutContext.GetOrCreateSymbol(NameResult.str());
1397}
1398
1399MCSymbol *AsmPrinter::GetMBBSymbol(unsigned MBBID) const {
1400  SmallString<60> Name;
1401  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "BB"
1402    << getFunctionNumber() << '_' << MBBID;
1403  return OutContext.GetOrCreateSymbol(Name.str());
1404}
1405
1406/// GetCPISymbol - Return the symbol for the specified constant pool entry.
1407MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
1408  SmallString<60> Name;
1409  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI"
1410    << getFunctionNumber() << '_' << CPID;
1411  return OutContext.GetOrCreateSymbol(Name.str());
1412}
1413
1414/// GetJTISymbol - Return the symbol for the specified jump table entry.
1415MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
1416  const char *Prefix = isLinkerPrivate ? MAI->getLinkerPrivateGlobalPrefix() :
1417                                         MAI->getPrivateGlobalPrefix();
1418  SmallString<60> Name;
1419  raw_svector_ostream(Name) << Prefix << "JTI" << getFunctionNumber() << '_'
1420    << JTID;
1421  return OutContext.GetOrCreateSymbol(Name.str());
1422}
1423
1424/// GetGlobalValueSymbol - Return the MCSymbol for the specified global
1425/// value.
1426MCSymbol *AsmPrinter::GetGlobalValueSymbol(const GlobalValue *GV) const {
1427  SmallString<60> NameStr;
1428  Mang->getNameWithPrefix(NameStr, GV, false);
1429  return OutContext.GetOrCreateSymbol(NameStr.str());
1430}
1431
1432/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
1433/// global value name as its base, with the specified suffix, and where the
1434/// symbol is forced to have private linkage if ForcePrivate is true.
1435MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
1436                                                   StringRef Suffix,
1437                                                   bool ForcePrivate) const {
1438  SmallString<60> NameStr;
1439  Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
1440  NameStr.append(Suffix.begin(), Suffix.end());
1441  return OutContext.GetOrCreateSymbol(NameStr.str());
1442}
1443
1444/// GetExternalSymbolSymbol - Return the MCSymbol for the specified
1445/// ExternalSymbol.
1446MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
1447  SmallString<60> NameStr;
1448  Mang->getNameWithPrefix(NameStr, Sym);
1449  return OutContext.GetOrCreateSymbol(NameStr.str());
1450}
1451
1452
1453
1454/// PrintParentLoopComment - Print comments about parent loops of this one.
1455static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1456                                   unsigned FunctionNumber) {
1457  if (Loop == 0) return;
1458  PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
1459  OS.indent(Loop->getLoopDepth()*2)
1460    << "Parent Loop BB" << FunctionNumber << "_"
1461    << Loop->getHeader()->getNumber()
1462    << " Depth=" << Loop->getLoopDepth() << '\n';
1463}
1464
1465
1466/// PrintChildLoopComment - Print comments about child loops within
1467/// the loop for this basic block, with nesting.
1468static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1469                                  unsigned FunctionNumber) {
1470  // Add child loop information
1471  for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
1472    OS.indent((*CL)->getLoopDepth()*2)
1473      << "Child Loop BB" << FunctionNumber << "_"
1474      << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
1475      << '\n';
1476    PrintChildLoopComment(OS, *CL, FunctionNumber);
1477  }
1478}
1479
1480/// EmitComments - Pretty-print comments for basic blocks.
1481static void PrintBasicBlockLoopComments(const MachineBasicBlock &MBB,
1482                                        const MachineLoopInfo *LI,
1483                                        const AsmPrinter &AP) {
1484  // Add loop depth information
1485  const MachineLoop *Loop = LI->getLoopFor(&MBB);
1486  if (Loop == 0) return;
1487
1488  MachineBasicBlock *Header = Loop->getHeader();
1489  assert(Header && "No header for loop");
1490
1491  // If this block is not a loop header, just print out what is the loop header
1492  // and return.
1493  if (Header != &MBB) {
1494    AP.OutStreamer.AddComment("  in Loop: Header=BB" +
1495                              Twine(AP.getFunctionNumber())+"_" +
1496                              Twine(Loop->getHeader()->getNumber())+
1497                              " Depth="+Twine(Loop->getLoopDepth()));
1498    return;
1499  }
1500
1501  // Otherwise, it is a loop header.  Print out information about child and
1502  // parent loops.
1503  raw_ostream &OS = AP.OutStreamer.GetCommentOS();
1504
1505  PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
1506
1507  OS << "=>";
1508  OS.indent(Loop->getLoopDepth()*2-2);
1509
1510  OS << "This ";
1511  if (Loop->empty())
1512    OS << "Inner ";
1513  OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
1514
1515  PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
1516}
1517
1518
1519/// EmitBasicBlockStart - This method prints the label for the specified
1520/// MachineBasicBlock, an alignment (if present) and a comment describing
1521/// it if appropriate.
1522void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
1523  // Emit an alignment directive for this block, if needed.
1524  if (unsigned Align = MBB->getAlignment())
1525    EmitAlignment(Log2_32(Align));
1526
1527  // If the block has its address taken, emit a special label to satisfy
1528  // references to the block. This is done so that we don't need to
1529  // remember the number of this label, and so that we can make
1530  // forward references to labels without knowing what their numbers
1531  // will be.
1532  if (MBB->hasAddressTaken()) {
1533    const BasicBlock *BB = MBB->getBasicBlock();
1534    if (VerboseAsm)
1535      OutStreamer.AddComment("Address Taken");
1536    OutStreamer.EmitLabel(GetBlockAddressSymbol(BB->getParent(), BB));
1537  }
1538
1539  // Print the main label for the block.
1540  if (MBB->pred_empty() || MBB->isOnlyReachableByFallthrough()) {
1541    if (VerboseAsm) {
1542      // NOTE: Want this comment at start of line.
1543      O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':';
1544      if (const BasicBlock *BB = MBB->getBasicBlock())
1545        if (BB->hasName())
1546          OutStreamer.AddComment("%" + BB->getName());
1547
1548      PrintBasicBlockLoopComments(*MBB, LI, *this);
1549      OutStreamer.AddBlankLine();
1550    }
1551  } else {
1552    if (VerboseAsm) {
1553      if (const BasicBlock *BB = MBB->getBasicBlock())
1554        if (BB->hasName())
1555          OutStreamer.AddComment("%" + BB->getName());
1556      PrintBasicBlockLoopComments(*MBB, LI, *this);
1557    }
1558
1559    OutStreamer.EmitLabel(GetMBBSymbol(MBB->getNumber()));
1560  }
1561}
1562
1563/// printPICJumpTableSetLabel - This method prints a set label for the
1564/// specified MachineBasicBlock for a jumptable entry.
1565void AsmPrinter::printPICJumpTableSetLabel(unsigned uid,
1566                                           const MachineBasicBlock *MBB) const {
1567  if (!MAI->getSetDirective())
1568    return;
1569
1570  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1571    << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ','
1572    << *GetMBBSymbol(MBB->getNumber())
1573    << '-' << *GetJTISymbol(uid) << '\n';
1574}
1575
1576void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
1577                                           const MachineBasicBlock *MBB) const {
1578  if (!MAI->getSetDirective())
1579    return;
1580
1581  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1582    << getFunctionNumber() << '_' << uid << '_' << uid2
1583    << "_set_" << MBB->getNumber() << ','
1584    << *GetMBBSymbol(MBB->getNumber())
1585    << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1586    << '_' << uid << '_' << uid2 << '\n';
1587}
1588
1589void AsmPrinter::printVisibility(MCSymbol *Sym, unsigned Visibility) const {
1590  MCSymbolAttr Attr = MCSA_Invalid;
1591
1592  switch (Visibility) {
1593  default: break;
1594  case GlobalValue::HiddenVisibility:
1595    Attr = MAI->getHiddenVisibilityAttr();
1596    break;
1597  case GlobalValue::ProtectedVisibility:
1598    Attr = MAI->getProtectedVisibilityAttr();
1599    break;
1600  }
1601
1602  if (Attr != MCSA_Invalid)
1603    OutStreamer.EmitSymbolAttribute(Sym, Attr);
1604}
1605
1606void AsmPrinter::printOffset(int64_t Offset) const {
1607  if (Offset > 0)
1608    O << '+' << Offset;
1609  else if (Offset < 0)
1610    O << Offset;
1611}
1612
1613GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1614  if (!S->usesMetadata())
1615    return 0;
1616
1617  gcp_iterator GCPI = GCMetadataPrinters.find(S);
1618  if (GCPI != GCMetadataPrinters.end())
1619    return GCPI->second;
1620
1621  const char *Name = S->getName().c_str();
1622
1623  for (GCMetadataPrinterRegistry::iterator
1624         I = GCMetadataPrinterRegistry::begin(),
1625         E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1626    if (strcmp(Name, I->getName()) == 0) {
1627      GCMetadataPrinter *GMP = I->instantiate();
1628      GMP->S = S;
1629      GCMetadataPrinters.insert(std::make_pair(S, GMP));
1630      return GMP;
1631    }
1632
1633  llvm_report_error("no GCMetadataPrinter registered for GC: " + Twine(Name));
1634  return 0;
1635}
1636
1637/// EmitComments - Pretty-print comments for instructions
1638void AsmPrinter::EmitComments(const MachineInstr &MI) const {
1639  if (!VerboseAsm)
1640    return;
1641
1642  bool Newline = false;
1643
1644  if (!MI.getDebugLoc().isUnknown()) {
1645    DILocation DLT = MF->getDILocation(MI.getDebugLoc());
1646
1647    // Print source line info.
1648    O.PadToColumn(MAI->getCommentColumn());
1649    O << MAI->getCommentString() << ' ';
1650    DIScope Scope = DLT.getScope();
1651    // Omit the directory, because it's likely to be long and uninteresting.
1652    if (!Scope.isNull())
1653      O << Scope.getFilename();
1654    else
1655      O << "<unknown>";
1656    O << ':' << DLT.getLineNumber();
1657    if (DLT.getColumnNumber() != 0)
1658      O << ':' << DLT.getColumnNumber();
1659    Newline = true;
1660  }
1661
1662  // Check for spills and reloads
1663  int FI;
1664
1665  const MachineFrameInfo *FrameInfo =
1666    MI.getParent()->getParent()->getFrameInfo();
1667
1668  // We assume a single instruction only has a spill or reload, not
1669  // both.
1670  const MachineMemOperand *MMO;
1671  if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
1672    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1673      MMO = *MI.memoperands_begin();
1674      if (Newline) O << '\n';
1675      O.PadToColumn(MAI->getCommentColumn());
1676      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Reload";
1677      Newline = true;
1678    }
1679  }
1680  else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
1681    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1682      if (Newline) O << '\n';
1683      O.PadToColumn(MAI->getCommentColumn());
1684      O << MAI->getCommentString() << ' '
1685        << MMO->getSize() << "-byte Folded Reload";
1686      Newline = true;
1687    }
1688  }
1689  else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
1690    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1691      MMO = *MI.memoperands_begin();
1692      if (Newline) O << '\n';
1693      O.PadToColumn(MAI->getCommentColumn());
1694      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Spill";
1695      Newline = true;
1696    }
1697  }
1698  else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
1699    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1700      if (Newline) O << '\n';
1701      O.PadToColumn(MAI->getCommentColumn());
1702      O << MAI->getCommentString() << ' '
1703        << MMO->getSize() << "-byte Folded Spill";
1704      Newline = true;
1705    }
1706  }
1707
1708  // Check for spill-induced copies
1709  unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
1710  if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg,
1711                                      SrcSubIdx, DstSubIdx)) {
1712    if (MI.getAsmPrinterFlag(ReloadReuse)) {
1713      if (Newline) O << '\n';
1714      O.PadToColumn(MAI->getCommentColumn());
1715      O << MAI->getCommentString() << " Reload Reuse";
1716    }
1717  }
1718}
1719
1720