AsmPrinter.cpp revision 4cf202ba066a1310d8968c8d069787254934e59b 
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/MCInst.h"
30#include "llvm/MC/MCSection.h"
31#include "llvm/MC/MCStreamer.h"
32#include "llvm/MC/MCSymbol.h"
33#include "llvm/Support/CommandLine.h"
34#include "llvm/Support/ErrorHandling.h"
35#include "llvm/Support/Format.h"
36#include "llvm/Support/FormattedStream.h"
37#include "llvm/MC/MCAsmInfo.h"
38#include "llvm/Target/Mangler.h"
39#include "llvm/Target/TargetData.h"
40#include "llvm/Target/TargetInstrInfo.h"
41#include "llvm/Target/TargetLowering.h"
42#include "llvm/Target/TargetLoweringObjectFile.h"
43#include "llvm/Target/TargetOptions.h"
44#include "llvm/Target/TargetRegisterInfo.h"
45#include "llvm/ADT/SmallPtrSet.h"
46#include "llvm/ADT/SmallString.h"
47#include <cerrno>
48using namespace llvm;
49
50static cl::opt<cl::boolOrDefault>
51AsmVerbose("asm-verbose", cl::desc("Add comments to directives."),
52           cl::init(cl::BOU_UNSET));
53
54static bool getVerboseAsm(bool VDef) {
55  switch (AsmVerbose) {
56  default:
57  case cl::BOU_UNSET: return VDef;
58  case cl::BOU_TRUE:  return true;
59  case cl::BOU_FALSE: return false;
60  }
61}
62
63char AsmPrinter::ID = 0;
64AsmPrinter::AsmPrinter(formatted_raw_ostream &o, TargetMachine &tm,
65                       const MCAsmInfo *T, bool VDef)
66  : MachineFunctionPass(&ID), FunctionNumber(0), O(o),
67    TM(tm), MAI(T), TRI(tm.getRegisterInfo()),
68
69    OutContext(*new MCContext()),
70    // FIXME: Pass instprinter to streamer.
71    OutStreamer(*createAsmStreamer(OutContext, O, *T,
72                                   TM.getTargetData()->isLittleEndian(),
73                                   getVerboseAsm(VDef), 0)),
74
75    LastMI(0), LastFn(0), Counter(~0U), PrevDLT(NULL) {
76  DW = 0; MMI = 0;
77  VerboseAsm = getVerboseAsm(VDef);
78}
79
80AsmPrinter::~AsmPrinter() {
81  for (gcp_iterator I = GCMetadataPrinters.begin(),
82                    E = GCMetadataPrinters.end(); I != E; ++I)
83    delete I->second;
84
85  delete &OutStreamer;
86  delete &OutContext;
87}
88
89TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
90  return TM.getTargetLowering()->getObjFileLowering();
91}
92
93/// getCurrentSection() - Return the current section we are emitting to.
94const MCSection *AsmPrinter::getCurrentSection() const {
95  return OutStreamer.getCurrentSection();
96}
97
98
99void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
100  AU.setPreservesAll();
101  MachineFunctionPass::getAnalysisUsage(AU);
102  AU.addRequired<GCModuleInfo>();
103  if (VerboseAsm)
104    AU.addRequired<MachineLoopInfo>();
105}
106
107bool AsmPrinter::doInitialization(Module &M) {
108  // Initialize TargetLoweringObjectFile.
109  const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
110    .Initialize(OutContext, TM);
111
112  Mang = new Mangler(*MAI);
113
114  // Allow the target to emit any magic that it wants at the start of the file.
115  EmitStartOfAsmFile(M);
116
117  if (MAI->hasSingleParameterDotFile()) {
118    /* Very minimal debug info. It is ignored if we emit actual
119       debug info. If we don't, this at least helps the user find where
120       a function came from. */
121    O << "\t.file\t\"" << M.getModuleIdentifier() << "\"\n";
122  }
123
124  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
125  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
126  for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
127    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
128      MP->beginAssembly(O, *this, *MAI);
129
130  if (!M.getModuleInlineAsm().empty())
131    O << MAI->getCommentString() << " Start of file scope inline assembly\n"
132      << M.getModuleInlineAsm()
133      << '\n' << MAI->getCommentString()
134      << " End of file scope inline assembly\n";
135
136  MMI = getAnalysisIfAvailable<MachineModuleInfo>();
137  if (MMI)
138    MMI->AnalyzeModule(M);
139  DW = getAnalysisIfAvailable<DwarfWriter>();
140  if (DW)
141    DW->BeginModule(&M, MMI, O, this, MAI);
142
143  return false;
144}
145
146/// EmitGlobalVariable - Emit the specified global variable to the .s file.
147void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
148  if (!GV->hasInitializer())   // External globals require no code.
149    return;
150
151  // Check to see if this is a special global used by LLVM, if so, emit it.
152  if (EmitSpecialLLVMGlobal(GV))
153    return;
154
155  MCSymbol *GVSym = GetGlobalValueSymbol(GV);
156  printVisibility(GVSym, GV->getVisibility());
157
158  if (MAI->hasDotTypeDotSizeDirective()) {
159    O << "\t.type\t" << *GVSym;
160    if (MAI->getCommentString()[0] != '@')
161      O << ",@object\n";
162    else
163      O << ",%object\n";
164  }
165
166  SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
167
168  const TargetData *TD = TM.getTargetData();
169  unsigned Size = TD->getTypeAllocSize(GV->getType()->getElementType());
170  unsigned AlignLog = TD->getPreferredAlignmentLog(GV);
171
172  // Handle common and BSS local symbols (.lcomm).
173  if (GVKind.isCommon() || GVKind.isBSSLocal()) {
174    if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
175
176    if (VerboseAsm) {
177      WriteAsOperand(OutStreamer.GetCommentOS(), GV,
178                     /*PrintType=*/false, GV->getParent());
179      OutStreamer.GetCommentOS() << '\n';
180    }
181
182    // Handle common symbols.
183    if (GVKind.isCommon()) {
184      // .comm _foo, 42, 4
185      OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
186      return;
187    }
188
189    // Handle local BSS symbols.
190    if (MAI->hasMachoZeroFillDirective()) {
191      const MCSection *TheSection =
192        getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
193      // .zerofill __DATA, __bss, _foo, 400, 5
194      OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
195      return;
196    }
197
198    if (const char *LComm = MAI->getLCOMMDirective()) {
199      // .lcomm _foo, 42
200      O << LComm << *GVSym << ',' << Size;
201      O << '\n';
202      return;
203    }
204
205    // .local _foo
206    O << "\t.local\t" << *GVSym << '\n';
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, MCStreamer::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, MCStreamer::Global);
239      // .weak_definition _foo
240      OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::WeakDefinition);
241    } else if (const char *LinkOnce = MAI->getLinkOnceDirective()) {
242      // .globl _foo
243      OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
244      // .linkonce same_size
245      O << LinkOnce;
246    } else {
247      // .weak _foo
248      OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::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, MCStreamer::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    O << "\t.size\t" << *GVSym << ", " << Size << '\n';
279
280  OutStreamer.AddBlankLine();
281}
282
283
284bool AsmPrinter::doFinalization(Module &M) {
285  // Emit global variables.
286  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
287       I != E; ++I)
288    EmitGlobalVariable(I);
289
290  // Emit final debug information.
291  if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
292    DW->EndModule();
293
294  // If the target wants to know about weak references, print them all.
295  if (MAI->getWeakRefDirective()) {
296    // FIXME: This is not lazy, it would be nice to only print weak references
297    // to stuff that is actually used.  Note that doing so would require targets
298    // to notice uses in operands (due to constant exprs etc).  This should
299    // happen with the MC stuff eventually.
300
301    // Print out module-level global variables here.
302    for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
303         I != E; ++I) {
304      if (!I->hasExternalWeakLinkage()) continue;
305      O << MAI->getWeakRefDirective() << *GetGlobalValueSymbol(I) << '\n';
306    }
307
308    for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
309      if (!I->hasExternalWeakLinkage()) continue;
310      O << MAI->getWeakRefDirective() << *GetGlobalValueSymbol(I) << '\n';
311    }
312  }
313
314  if (MAI->getSetDirective()) {
315    O << '\n';
316    for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
317         I != E; ++I) {
318      MCSymbol *Name = GetGlobalValueSymbol(I);
319
320      const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
321      MCSymbol *Target = GetGlobalValueSymbol(GV);
322
323      if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
324        O << "\t.globl\t" << *Name << '\n';
325      else if (I->hasWeakLinkage())
326        O << MAI->getWeakRefDirective() << *Name << '\n';
327      else
328        assert(I->hasLocalLinkage() && "Invalid alias linkage");
329
330      printVisibility(Name, I->getVisibility());
331
332      O << MAI->getSetDirective() << ' ' << *Name << ", " << *Target << '\n';
333    }
334  }
335
336  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
337  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
338  for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
339    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
340      MP->finishAssembly(O, *this, *MAI);
341
342  // If we don't have any trampolines, then we don't require stack memory
343  // to be executable. Some targets have a directive to declare this.
344  Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
345  if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
346    if (MAI->getNonexecutableStackDirective())
347      O << MAI->getNonexecutableStackDirective() << '\n';
348
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      O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
453        << CPI << ':';
454      if (VerboseAsm) {
455        O.PadToColumn(MAI->getCommentColumn());
456        O << MAI->getCommentString() << " constant ";
457        WriteTypeSymbolic(O, CPE.getType(), MF->getFunction()->getParent());
458      }
459      O << '\n';
460      if (CPE.isMachineConstantPoolEntry())
461        EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
462      else
463        EmitGlobalConstant(CPE.Val.ConstVal);
464    }
465  }
466}
467
468/// EmitJumpTableInfo - Print assembly representations of the jump tables used
469/// by the current function to the current output stream.
470///
471void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
472                                   MachineFunction &MF) {
473  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
474  if (JT.empty()) return;
475
476  bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
477
478  // Pick the directive to use to print the jump table entries, and switch to
479  // the appropriate section.
480  TargetLowering *LoweringInfo = TM.getTargetLowering();
481
482  const Function *F = MF.getFunction();
483  bool JTInDiffSection = false;
484  if (F->isWeakForLinker() ||
485      (IsPic && !LoweringInfo->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  EmitAlignment(Log2_32(MJTI->getAlignment()));
501
502  for (unsigned i = 0, e = JT.size(); i != e; ++i) {
503    const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
504
505    // If this jump table was deleted, ignore it.
506    if (JTBBs.empty()) continue;
507
508    // For PIC codegen, if possible we want to use the SetDirective to reduce
509    // the number of relocations the assembler will generate for the jump table.
510    // Set directives are all printed before the jump table itself.
511    SmallPtrSet<MachineBasicBlock*, 16> EmittedSets;
512    if (MAI->getSetDirective() && IsPic)
513      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
514        if (EmittedSets.insert(JTBBs[ii]))
515          printPICJumpTableSetLabel(i, JTBBs[ii]);
516
517    // On some targets (e.g. Darwin) we want to emit two consequtive labels
518    // before each jump table.  The first label is never referenced, but tells
519    // the assembler and linker the extents of the jump table object.  The
520    // second label is actually referenced by the code.
521    if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0]) {
522      O << MAI->getLinkerPrivateGlobalPrefix()
523        << "JTI" << getFunctionNumber() << '_' << i << ":\n";
524    }
525
526    O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
527      << '_' << i << ":\n";
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 << '-' << MAI->getPrivateGlobalPrefix() << "JTI"
568        << getFunctionNumber() << '_' << uid;
569  }
570}
571
572
573/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
574/// special global used by LLVM.  If so, emit it and return true, otherwise
575/// do nothing and return false.
576bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
577  if (GV->getName() == "llvm.used") {
578    if (MAI->getUsedDirective() != 0)    // No need to emit this at all.
579      EmitLLVMUsedList(GV->getInitializer());
580    return true;
581  }
582
583  // Ignore debug and non-emitted data.  This handles llvm.compiler.used.
584  if (GV->getSection() == "llvm.metadata" ||
585      GV->hasAvailableExternallyLinkage())
586    return true;
587
588  if (!GV->hasAppendingLinkage()) return false;
589
590  assert(GV->hasInitializer() && "Not a special LLVM global!");
591
592  const TargetData *TD = TM.getTargetData();
593  unsigned Align = Log2_32(TD->getPointerPrefAlignment());
594  if (GV->getName() == "llvm.global_ctors") {
595    OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
596    EmitAlignment(Align, 0);
597    EmitXXStructorList(GV->getInitializer());
598
599    if (TM.getRelocationModel() == Reloc::Static &&
600        MAI->hasStaticCtorDtorReferenceInStaticMode())
601      O << ".reference .constructors_used\n";
602    return true;
603  }
604
605  if (GV->getName() == "llvm.global_dtors") {
606    OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
607    EmitAlignment(Align, 0);
608    EmitXXStructorList(GV->getInitializer());
609
610    if (TM.getRelocationModel() == Reloc::Static &&
611        MAI->hasStaticCtorDtorReferenceInStaticMode())
612      O << ".reference .destructors_used\n";
613    return true;
614  }
615
616  return false;
617}
618
619/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
620/// global in the specified llvm.used list for which emitUsedDirectiveFor
621/// is true, as being used with this directive.
622void AsmPrinter::EmitLLVMUsedList(Constant *List) {
623  const char *Directive = MAI->getUsedDirective();
624
625  // Should be an array of 'i8*'.
626  ConstantArray *InitList = dyn_cast<ConstantArray>(List);
627  if (InitList == 0) return;
628
629  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
630    const GlobalValue *GV =
631      dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
632    if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang)) {
633      O << Directive;
634      EmitConstantValueOnly(InitList->getOperand(i));
635      O << '\n';
636    }
637  }
638}
639
640/// EmitXXStructorList - Emit the ctor or dtor list.  This just prints out the
641/// function pointers, ignoring the init priority.
642void AsmPrinter::EmitXXStructorList(Constant *List) {
643  // Should be an array of '{ int, void ()* }' structs.  The first value is the
644  // init priority, which we ignore.
645  if (!isa<ConstantArray>(List)) return;
646  ConstantArray *InitList = cast<ConstantArray>(List);
647  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
648    if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
649      if (CS->getNumOperands() != 2) return;  // Not array of 2-element structs.
650
651      if (CS->getOperand(1)->isNullValue())
652        return;  // Found a null terminator, exit printing.
653      // Emit the function pointer.
654      EmitGlobalConstant(CS->getOperand(1));
655    }
656}
657
658//===--------------------------------------------------------------------===//
659// Emission and print routines
660//
661
662/// EmitInt8 - Emit a byte directive and value.
663///
664void AsmPrinter::EmitInt8(int Value) const {
665  OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/);
666}
667
668/// EmitInt16 - Emit a short directive and value.
669///
670void AsmPrinter::EmitInt16(int Value) const {
671  OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/);
672}
673
674/// EmitInt32 - Emit a long directive and value.
675///
676void AsmPrinter::EmitInt32(int Value) const {
677  OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/);
678}
679
680/// EmitInt64 - Emit a long long directive and value.
681///
682void AsmPrinter::EmitInt64(uint64_t Value) const {
683  OutStreamer.EmitIntValue(Value, 8, 0/*addrspace*/);
684}
685
686/// toOctal - Convert the low order bits of X into an octal digit.
687///
688static inline char toOctal(int X) {
689  return (X&7)+'0';
690}
691
692/// printStringChar - Print a char, escaped if necessary.
693///
694static void printStringChar(formatted_raw_ostream &O, unsigned char C) {
695  if (C == '"') {
696    O << "\\\"";
697  } else if (C == '\\') {
698    O << "\\\\";
699  } else if (isprint((unsigned char)C)) {
700    O << C;
701  } else {
702    switch(C) {
703    case '\b': O << "\\b"; break;
704    case '\f': O << "\\f"; break;
705    case '\n': O << "\\n"; break;
706    case '\r': O << "\\r"; break;
707    case '\t': O << "\\t"; break;
708    default:
709      O << '\\';
710      O << toOctal(C >> 6);
711      O << toOctal(C >> 3);
712      O << toOctal(C >> 0);
713      break;
714    }
715  }
716}
717
718/// EmitFile - Emit a .file directive.
719void AsmPrinter::EmitFile(unsigned Number, StringRef Name) const {
720  O << "\t.file\t" << Number << " \"";
721  for (unsigned i = 0, N = Name.size(); i < N; ++i)
722    printStringChar(O, Name[i]);
723  O << '\"';
724}
725
726
727//===----------------------------------------------------------------------===//
728
729// EmitAlignment - Emit an alignment directive to the specified power of
730// two boundary.  For example, if you pass in 3 here, you will get an 8
731// byte alignment.  If a global value is specified, and if that global has
732// an explicit alignment requested, it will unconditionally override the
733// alignment request.  However, if ForcedAlignBits is specified, this value
734// has final say: the ultimate alignment will be the max of ForcedAlignBits
735// and the alignment computed with NumBits and the global.
736//
737// The algorithm is:
738//     Align = NumBits;
739//     if (GV && GV->hasalignment) Align = GV->getalignment();
740//     Align = std::max(Align, ForcedAlignBits);
741//
742void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
743                               unsigned ForcedAlignBits,
744                               bool UseFillExpr) const {
745  if (GV && GV->getAlignment())
746    NumBits = Log2_32(GV->getAlignment());
747  NumBits = std::max(NumBits, ForcedAlignBits);
748
749  if (NumBits == 0) return;   // No need to emit alignment.
750
751  unsigned FillValue = 0;
752  if (getCurrentSection()->getKind().isText())
753    FillValue = MAI->getTextAlignFillValue();
754
755  OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0);
756}
757
758// Print out the specified constant, without a storage class.  Only the
759// constants valid in constant expressions can occur here.
760void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
761  if (CV->isNullValue() || isa<UndefValue>(CV)) {
762    O << '0';
763    return;
764  }
765
766  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
767    O << CI->getZExtValue();
768    return;
769  }
770
771  if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
772    // This is a constant address for a global variable or function. Use the
773    // name of the variable or function as the address value.
774    O << *GetGlobalValueSymbol(GV);
775    return;
776  }
777
778  if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV)) {
779    O << *GetBlockAddressSymbol(BA);
780    return;
781  }
782
783  const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
784  if (CE == 0) {
785    llvm_unreachable("Unknown constant value!");
786    O << '0';
787    return;
788  }
789
790  switch (CE->getOpcode()) {
791  case Instruction::ZExt:
792  case Instruction::SExt:
793  case Instruction::FPTrunc:
794  case Instruction::FPExt:
795  case Instruction::UIToFP:
796  case Instruction::SIToFP:
797  case Instruction::FPToUI:
798  case Instruction::FPToSI:
799  default:
800    llvm_unreachable("FIXME: Don't support this constant cast expr");
801  case Instruction::GetElementPtr: {
802    // generate a symbolic expression for the byte address
803    const TargetData *TD = TM.getTargetData();
804    const Constant *ptrVal = CE->getOperand(0);
805    SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
806    int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
807                                          idxVec.size());
808    if (Offset == 0)
809      return EmitConstantValueOnly(ptrVal);
810
811    // Truncate/sext the offset to the pointer size.
812    if (TD->getPointerSizeInBits() != 64) {
813      int SExtAmount = 64-TD->getPointerSizeInBits();
814      Offset = (Offset << SExtAmount) >> SExtAmount;
815    }
816
817    if (Offset)
818      O << '(';
819    EmitConstantValueOnly(ptrVal);
820    if (Offset > 0)
821      O << ") + " << Offset;
822    else
823      O << ") - " << -Offset;
824    return;
825  }
826  case Instruction::BitCast:
827    return EmitConstantValueOnly(CE->getOperand(0));
828
829  case Instruction::IntToPtr: {
830    // Handle casts to pointers by changing them into casts to the appropriate
831    // integer type.  This promotes constant folding and simplifies this code.
832    const TargetData *TD = TM.getTargetData();
833    Constant *Op = CE->getOperand(0);
834    Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(CV->getContext()),
835                                      false/*ZExt*/);
836    return EmitConstantValueOnly(Op);
837  }
838
839  case Instruction::PtrToInt: {
840    // Support only foldable casts to/from pointers that can be eliminated by
841    // changing the pointer to the appropriately sized integer type.
842    Constant *Op = CE->getOperand(0);
843    const Type *Ty = CE->getType();
844    const TargetData *TD = TM.getTargetData();
845
846    // We can emit the pointer value into this slot if the slot is an
847    // integer slot greater or equal to the size of the pointer.
848    if (TD->getTypeAllocSize(Ty) == TD->getTypeAllocSize(Op->getType()))
849      return EmitConstantValueOnly(Op);
850
851    O << "((";
852    EmitConstantValueOnly(Op);
853    APInt ptrMask =
854      APInt::getAllOnesValue(TD->getTypeAllocSizeInBits(Op->getType()));
855
856    SmallString<40> S;
857    ptrMask.toStringUnsigned(S);
858    O << ") & " << S.str() << ')';
859    return;
860  }
861
862  case Instruction::Trunc:
863    // We emit the value and depend on the assembler to truncate the generated
864    // expression properly.  This is important for differences between
865    // blockaddress labels.  Since the two labels are in the same function, it
866    // is reasonable to treat their delta as a 32-bit value.
867    return EmitConstantValueOnly(CE->getOperand(0));
868
869  case Instruction::Add:
870  case Instruction::Sub:
871  case Instruction::And:
872  case Instruction::Or:
873  case Instruction::Xor:
874    O << '(';
875    EmitConstantValueOnly(CE->getOperand(0));
876    O << ')';
877    switch (CE->getOpcode()) {
878    case Instruction::Add:
879     O << " + ";
880     break;
881    case Instruction::Sub:
882     O << " - ";
883     break;
884    case Instruction::And:
885     O << " & ";
886     break;
887    case Instruction::Or:
888     O << " | ";
889     break;
890    case Instruction::Xor:
891     O << " ^ ";
892     break;
893    default:
894     break;
895    }
896    O << '(';
897    EmitConstantValueOnly(CE->getOperand(1));
898    O << ')';
899    break;
900  }
901}
902
903/// printAsCString - Print the specified array as a C compatible string, only if
904/// the predicate isString is true.
905///
906static void printAsCString(formatted_raw_ostream &O, const ConstantArray *CVA,
907                           unsigned LastElt) {
908  assert(CVA->isString() && "Array is not string compatible!");
909
910  O << '\"';
911  for (unsigned i = 0; i != LastElt; ++i) {
912    unsigned char C =
913        (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
914    printStringChar(O, C);
915  }
916  O << '\"';
917}
918
919/// EmitString - Emit a zero-byte-terminated string constant.
920///
921void AsmPrinter::EmitString(const ConstantArray *CVA) const {
922  unsigned NumElts = CVA->getNumOperands();
923  if (MAI->getAscizDirective() && NumElts &&
924      cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
925    O << MAI->getAscizDirective();
926    printAsCString(O, CVA, NumElts-1);
927  } else {
928    O << MAI->getAsciiDirective();
929    printAsCString(O, CVA, NumElts);
930  }
931  O << '\n';
932}
933
934static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace,
935                                    AsmPrinter &AP) {
936  if (AddrSpace == 0 && CA->isString()) {
937    AP.EmitString(CA);
938  } else { // Not a string.  Print the values in successive locations
939    for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
940      AP.EmitGlobalConstant(CA->getOperand(i), AddrSpace);
941  }
942}
943
944static void EmitGlobalConstantVector(const ConstantVector *CV,
945                                     unsigned AddrSpace, AsmPrinter &AP) {
946  for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
947    AP.EmitGlobalConstant(CV->getOperand(i), AddrSpace);
948}
949
950static void EmitGlobalConstantStruct(const ConstantStruct *CS,
951                                     unsigned AddrSpace, AsmPrinter &AP) {
952  // Print the fields in successive locations. Pad to align if needed!
953  const TargetData *TD = AP.TM.getTargetData();
954  unsigned Size = TD->getTypeAllocSize(CS->getType());
955  const StructLayout *Layout = TD->getStructLayout(CS->getType());
956  uint64_t SizeSoFar = 0;
957  for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
958    const Constant *Field = CS->getOperand(i);
959
960    // Check if padding is needed and insert one or more 0s.
961    uint64_t FieldSize = TD->getTypeAllocSize(Field->getType());
962    uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
963                        - Layout->getElementOffset(i)) - FieldSize;
964    SizeSoFar += FieldSize + PadSize;
965
966    // Now print the actual field value.
967    AP.EmitGlobalConstant(Field, AddrSpace);
968
969    // Insert padding - this may include padding to increase the size of the
970    // current field up to the ABI size (if the struct is not packed) as well
971    // as padding to ensure that the next field starts at the right offset.
972    AP.OutStreamer.EmitZeros(PadSize, AddrSpace);
973  }
974  assert(SizeSoFar == Layout->getSizeInBytes() &&
975         "Layout of constant struct may be incorrect!");
976}
977
978static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace,
979                                 AsmPrinter &AP) {
980  // FP Constants are printed as integer constants to avoid losing
981  // precision.
982  if (CFP->getType()->isDoubleTy()) {
983    if (AP.VerboseAsm) {
984      double Val = CFP->getValueAPF().convertToDouble();
985      AP.OutStreamer.GetCommentOS() << "double " << Val << '\n';
986    }
987
988    uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
989    AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
990    return;
991  }
992
993  if (CFP->getType()->isFloatTy()) {
994    if (AP.VerboseAsm) {
995      float Val = CFP->getValueAPF().convertToFloat();
996      AP.OutStreamer.GetCommentOS() << "float " << Val << '\n';
997    }
998    uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
999    AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace);
1000    return;
1001  }
1002
1003  if (CFP->getType()->isX86_FP80Ty()) {
1004    // all long double variants are printed as hex
1005    // api needed to prevent premature destruction
1006    APInt API = CFP->getValueAPF().bitcastToAPInt();
1007    const uint64_t *p = API.getRawData();
1008    if (AP.VerboseAsm) {
1009      // Convert to double so we can print the approximate val as a comment.
1010      APFloat DoubleVal = CFP->getValueAPF();
1011      bool ignored;
1012      DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1013                        &ignored);
1014      AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= "
1015        << DoubleVal.convertToDouble() << '\n';
1016    }
1017
1018    if (AP.TM.getTargetData()->isBigEndian()) {
1019      AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1020      AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1021    } else {
1022      AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1023      AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1024    }
1025
1026    // Emit the tail padding for the long double.
1027    const TargetData &TD = *AP.TM.getTargetData();
1028    AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) -
1029                             TD.getTypeStoreSize(CFP->getType()), AddrSpace);
1030    return;
1031  }
1032
1033  assert(CFP->getType()->isPPC_FP128Ty() &&
1034         "Floating point constant type not handled");
1035  // All long double variants are printed as hex api needed to prevent
1036  // premature destruction.
1037  APInt API = CFP->getValueAPF().bitcastToAPInt();
1038  const uint64_t *p = API.getRawData();
1039  if (AP.TM.getTargetData()->isBigEndian()) {
1040    AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1041    AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1042  } else {
1043    AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1044    AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1045  }
1046}
1047
1048static void EmitGlobalConstantLargeInt(const ConstantInt *CI,
1049                                       unsigned AddrSpace, AsmPrinter &AP) {
1050  const TargetData *TD = AP.TM.getTargetData();
1051  unsigned BitWidth = CI->getBitWidth();
1052  assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
1053
1054  // We don't expect assemblers to support integer data directives
1055  // for more than 64 bits, so we emit the data in at most 64-bit
1056  // quantities at a time.
1057  const uint64_t *RawData = CI->getValue().getRawData();
1058  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1059    uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i];
1060    AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1061  }
1062}
1063
1064/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1065void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1066  if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) {
1067    uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1068    return OutStreamer.EmitZeros(Size, AddrSpace);
1069  }
1070
1071  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1072    unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1073    switch (Size) {
1074    case 1:
1075    case 2:
1076    case 4:
1077    case 8:
1078      if (VerboseAsm)
1079        OutStreamer.GetCommentOS() << format("0x%llx\n", CI->getZExtValue());
1080      OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace);
1081      return;
1082    default:
1083      EmitGlobalConstantLargeInt(CI, AddrSpace, *this);
1084      return;
1085    }
1086  }
1087
1088  if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
1089    return EmitGlobalConstantArray(CVA, AddrSpace, *this);
1090
1091  if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
1092    return EmitGlobalConstantStruct(CVS, AddrSpace, *this);
1093
1094  if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
1095    return EmitGlobalConstantFP(CFP, AddrSpace, *this);
1096
1097  if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
1098    return EmitGlobalConstantVector(V, AddrSpace, *this);
1099
1100  if (isa<ConstantPointerNull>(CV)) {
1101    unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1102    OutStreamer.EmitIntValue(0, Size, AddrSpace);
1103    return;
1104  }
1105
1106  // Otherwise, it must be a ConstantExpr.  Emit the data directive, then emit
1107  // the expression value.
1108  switch (TM.getTargetData()->getTypeAllocSize(CV->getType())) {
1109  case 0: return;
1110  case 1: O << MAI->getData8bitsDirective(AddrSpace); break;
1111  case 2: O << MAI->getData16bitsDirective(AddrSpace); break;
1112  case 4: O << MAI->getData32bitsDirective(AddrSpace); break;
1113  case 8:
1114    if (const char *Dir = MAI->getData64bitsDirective(AddrSpace)) {
1115      O << Dir;
1116      break;
1117    }
1118    // FALL THROUGH.
1119  default:
1120    llvm_unreachable("Target cannot handle given data directive width!");
1121    return;
1122  }
1123
1124  EmitConstantValueOnly(CV);
1125  O << '\n';
1126}
1127
1128void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1129  // Target doesn't support this yet!
1130  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1131}
1132
1133/// PrintSpecial - Print information related to the specified machine instr
1134/// that is independent of the operand, and may be independent of the instr
1135/// itself.  This can be useful for portably encoding the comment character
1136/// or other bits of target-specific knowledge into the asmstrings.  The
1137/// syntax used is ${:comment}.  Targets can override this to add support
1138/// for their own strange codes.
1139void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1140  if (!strcmp(Code, "private")) {
1141    O << MAI->getPrivateGlobalPrefix();
1142  } else if (!strcmp(Code, "comment")) {
1143    if (VerboseAsm)
1144      O << MAI->getCommentString();
1145  } else if (!strcmp(Code, "uid")) {
1146    // Comparing the address of MI isn't sufficient, because machineinstrs may
1147    // be allocated to the same address across functions.
1148    const Function *ThisF = MI->getParent()->getParent()->getFunction();
1149
1150    // If this is a new LastFn instruction, bump the counter.
1151    if (LastMI != MI || LastFn != ThisF) {
1152      ++Counter;
1153      LastMI = MI;
1154      LastFn = ThisF;
1155    }
1156    O << Counter;
1157  } else {
1158    std::string msg;
1159    raw_string_ostream Msg(msg);
1160    Msg << "Unknown special formatter '" << Code
1161         << "' for machine instr: " << *MI;
1162    llvm_report_error(Msg.str());
1163  }
1164}
1165
1166/// processDebugLoc - Processes the debug information of each machine
1167/// instruction's DebugLoc.
1168void AsmPrinter::processDebugLoc(const MachineInstr *MI,
1169                                 bool BeforePrintingInsn) {
1170  if (!MAI || !DW || !MAI->doesSupportDebugInformation()
1171      || !DW->ShouldEmitDwarfDebug())
1172    return;
1173  DebugLoc DL = MI->getDebugLoc();
1174  if (DL.isUnknown())
1175    return;
1176  DILocation CurDLT = MF->getDILocation(DL);
1177  if (CurDLT.getScope().isNull())
1178    return;
1179
1180  if (!BeforePrintingInsn) {
1181    // After printing instruction
1182    DW->EndScope(MI);
1183  } else if (CurDLT.getNode() != PrevDLT) {
1184    unsigned L = DW->RecordSourceLine(CurDLT.getLineNumber(),
1185                                      CurDLT.getColumnNumber(),
1186                                      CurDLT.getScope().getNode());
1187    printLabel(L);
1188    O << '\n';
1189    DW->BeginScope(MI, L);
1190    PrevDLT = CurDLT.getNode();
1191  }
1192}
1193
1194
1195/// printInlineAsm - This method formats and prints the specified machine
1196/// instruction that is an inline asm.
1197void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1198  unsigned NumOperands = MI->getNumOperands();
1199
1200  // Count the number of register definitions.
1201  unsigned NumDefs = 0;
1202  for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1203       ++NumDefs)
1204    assert(NumDefs != NumOperands-1 && "No asm string?");
1205
1206  assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1207
1208  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1209  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1210
1211  O << '\t';
1212
1213  // If this asmstr is empty, just print the #APP/#NOAPP markers.
1214  // These are useful to see where empty asm's wound up.
1215  if (AsmStr[0] == 0) {
1216    O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1217    O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
1218    return;
1219  }
1220
1221  O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1222
1223  // The variant of the current asmprinter.
1224  int AsmPrinterVariant = MAI->getAssemblerDialect();
1225
1226  int CurVariant = -1;            // The number of the {.|.|.} region we are in.
1227  const char *LastEmitted = AsmStr; // One past the last character emitted.
1228
1229  while (*LastEmitted) {
1230    switch (*LastEmitted) {
1231    default: {
1232      // Not a special case, emit the string section literally.
1233      const char *LiteralEnd = LastEmitted+1;
1234      while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1235             *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1236        ++LiteralEnd;
1237      if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1238        O.write(LastEmitted, LiteralEnd-LastEmitted);
1239      LastEmitted = LiteralEnd;
1240      break;
1241    }
1242    case '\n':
1243      ++LastEmitted;   // Consume newline character.
1244      O << '\n';       // Indent code with newline.
1245      break;
1246    case '$': {
1247      ++LastEmitted;   // Consume '$' character.
1248      bool Done = true;
1249
1250      // Handle escapes.
1251      switch (*LastEmitted) {
1252      default: Done = false; break;
1253      case '$':     // $$ -> $
1254        if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1255          O << '$';
1256        ++LastEmitted;  // Consume second '$' character.
1257        break;
1258      case '(':             // $( -> same as GCC's { character.
1259        ++LastEmitted;      // Consume '(' character.
1260        if (CurVariant != -1) {
1261          llvm_report_error("Nested variants found in inline asm string: '"
1262                            + std::string(AsmStr) + "'");
1263        }
1264        CurVariant = 0;     // We're in the first variant now.
1265        break;
1266      case '|':
1267        ++LastEmitted;  // consume '|' character.
1268        if (CurVariant == -1)
1269          O << '|';       // this is gcc's behavior for | outside a variant
1270        else
1271          ++CurVariant;   // We're in the next variant.
1272        break;
1273      case ')':         // $) -> same as GCC's } char.
1274        ++LastEmitted;  // consume ')' character.
1275        if (CurVariant == -1)
1276          O << '}';     // this is gcc's behavior for } outside a variant
1277        else
1278          CurVariant = -1;
1279        break;
1280      }
1281      if (Done) break;
1282
1283      bool HasCurlyBraces = false;
1284      if (*LastEmitted == '{') {     // ${variable}
1285        ++LastEmitted;               // Consume '{' character.
1286        HasCurlyBraces = true;
1287      }
1288
1289      // If we have ${:foo}, then this is not a real operand reference, it is a
1290      // "magic" string reference, just like in .td files.  Arrange to call
1291      // PrintSpecial.
1292      if (HasCurlyBraces && *LastEmitted == ':') {
1293        ++LastEmitted;
1294        const char *StrStart = LastEmitted;
1295        const char *StrEnd = strchr(StrStart, '}');
1296        if (StrEnd == 0) {
1297          llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1298                            + std::string(AsmStr) + "'");
1299        }
1300
1301        std::string Val(StrStart, StrEnd);
1302        PrintSpecial(MI, Val.c_str());
1303        LastEmitted = StrEnd+1;
1304        break;
1305      }
1306
1307      const char *IDStart = LastEmitted;
1308      char *IDEnd;
1309      errno = 0;
1310      long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1311      if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1312        llvm_report_error("Bad $ operand number in inline asm string: '"
1313                          + std::string(AsmStr) + "'");
1314      }
1315      LastEmitted = IDEnd;
1316
1317      char Modifier[2] = { 0, 0 };
1318
1319      if (HasCurlyBraces) {
1320        // If we have curly braces, check for a modifier character.  This
1321        // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1322        if (*LastEmitted == ':') {
1323          ++LastEmitted;    // Consume ':' character.
1324          if (*LastEmitted == 0) {
1325            llvm_report_error("Bad ${:} expression in inline asm string: '"
1326                              + std::string(AsmStr) + "'");
1327          }
1328
1329          Modifier[0] = *LastEmitted;
1330          ++LastEmitted;    // Consume modifier character.
1331        }
1332
1333        if (*LastEmitted != '}') {
1334          llvm_report_error("Bad ${} expression in inline asm string: '"
1335                            + std::string(AsmStr) + "'");
1336        }
1337        ++LastEmitted;    // Consume '}' character.
1338      }
1339
1340      if ((unsigned)Val >= NumOperands-1) {
1341        llvm_report_error("Invalid $ operand number in inline asm string: '"
1342                          + std::string(AsmStr) + "'");
1343      }
1344
1345      // Okay, we finally have a value number.  Ask the target to print this
1346      // operand!
1347      if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1348        unsigned OpNo = 1;
1349
1350        bool Error = false;
1351
1352        // Scan to find the machine operand number for the operand.
1353        for (; Val; --Val) {
1354          if (OpNo >= MI->getNumOperands()) break;
1355          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1356          OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1357        }
1358
1359        if (OpNo >= MI->getNumOperands()) {
1360          Error = true;
1361        } else {
1362          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1363          ++OpNo;  // Skip over the ID number.
1364
1365          if (Modifier[0] == 'l')  // labels are target independent
1366            O << *GetMBBSymbol(MI->getOperand(OpNo).getMBB()->getNumber());
1367          else {
1368            AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1369            if ((OpFlags & 7) == 4) {
1370              Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1371                                                Modifier[0] ? Modifier : 0);
1372            } else {
1373              Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1374                                          Modifier[0] ? Modifier : 0);
1375            }
1376          }
1377        }
1378        if (Error) {
1379          std::string msg;
1380          raw_string_ostream Msg(msg);
1381          Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n";
1382          MI->print(Msg);
1383          llvm_report_error(Msg.str());
1384        }
1385      }
1386      break;
1387    }
1388    }
1389  }
1390  O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd();
1391}
1392
1393/// printImplicitDef - This method prints the specified machine instruction
1394/// that is an implicit def.
1395void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1396  if (!VerboseAsm) return;
1397  O.PadToColumn(MAI->getCommentColumn());
1398  O << MAI->getCommentString() << " implicit-def: "
1399    << TRI->getName(MI->getOperand(0).getReg());
1400}
1401
1402void AsmPrinter::printKill(const MachineInstr *MI) const {
1403  if (!VerboseAsm) return;
1404  O.PadToColumn(MAI->getCommentColumn());
1405  O << MAI->getCommentString() << " kill:";
1406  for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) {
1407    const MachineOperand &op = MI->getOperand(n);
1408    assert(op.isReg() && "KILL instruction must have only register operands");
1409    O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>");
1410  }
1411}
1412
1413/// printLabel - This method prints a local label used by debug and
1414/// exception handling tables.
1415void AsmPrinter::printLabel(const MachineInstr *MI) const {
1416  printLabel(MI->getOperand(0).getImm());
1417}
1418
1419void AsmPrinter::printLabel(unsigned Id) const {
1420  O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':';
1421}
1422
1423/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1424/// instruction, using the specified assembler variant.  Targets should
1425/// override this to format as appropriate.
1426bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1427                                 unsigned AsmVariant, const char *ExtraCode) {
1428  // Target doesn't support this yet!
1429  return true;
1430}
1431
1432bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1433                                       unsigned AsmVariant,
1434                                       const char *ExtraCode) {
1435  // Target doesn't support this yet!
1436  return true;
1437}
1438
1439MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA,
1440                                            const char *Suffix) const {
1441  return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock(), Suffix);
1442}
1443
1444MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F,
1445                                            const BasicBlock *BB,
1446                                            const char *Suffix) const {
1447  assert(BB->hasName() &&
1448         "Address of anonymous basic block not supported yet!");
1449
1450  // This code must use the function name itself, and not the function number,
1451  // since it must be possible to generate the label name from within other
1452  // functions.
1453  SmallString<60> FnName;
1454  Mang->getNameWithPrefix(FnName, F, false);
1455
1456  // FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME!
1457  SmallString<60> NameResult;
1458  Mang->getNameWithPrefix(NameResult,
1459                          StringRef("BA") + Twine((unsigned)FnName.size()) +
1460                          "_" + FnName.str() + "_" + BB->getName() + Suffix,
1461                          Mangler::Private);
1462
1463  return OutContext.GetOrCreateSymbol(NameResult.str());
1464}
1465
1466MCSymbol *AsmPrinter::GetMBBSymbol(unsigned MBBID) const {
1467  SmallString<60> Name;
1468  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "BB"
1469    << getFunctionNumber() << '_' << MBBID;
1470
1471  return OutContext.GetOrCreateSymbol(Name.str());
1472}
1473
1474/// GetGlobalValueSymbol - Return the MCSymbol for the specified global
1475/// value.
1476MCSymbol *AsmPrinter::GetGlobalValueSymbol(const GlobalValue *GV) const {
1477  SmallString<60> NameStr;
1478  Mang->getNameWithPrefix(NameStr, GV, false);
1479  return OutContext.GetOrCreateSymbol(NameStr.str());
1480}
1481
1482/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
1483/// global value name as its base, with the specified suffix, and where the
1484/// symbol is forced to have private linkage if ForcePrivate is true.
1485MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
1486                                                   StringRef Suffix,
1487                                                   bool ForcePrivate) const {
1488  SmallString<60> NameStr;
1489  Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
1490  NameStr.append(Suffix.begin(), Suffix.end());
1491  return OutContext.GetOrCreateSymbol(NameStr.str());
1492}
1493
1494/// GetExternalSymbolSymbol - Return the MCSymbol for the specified
1495/// ExternalSymbol.
1496MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
1497  SmallString<60> NameStr;
1498  Mang->getNameWithPrefix(NameStr, Sym);
1499  return OutContext.GetOrCreateSymbol(NameStr.str());
1500}
1501
1502
1503
1504/// PrintParentLoopComment - Print comments about parent loops of this one.
1505static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1506                                   unsigned FunctionNumber) {
1507  if (Loop == 0) return;
1508  PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
1509  OS.indent(Loop->getLoopDepth()*2)
1510    << "Parent Loop BB" << FunctionNumber << "_"
1511    << Loop->getHeader()->getNumber()
1512    << " Depth=" << Loop->getLoopDepth() << '\n';
1513}
1514
1515
1516/// PrintChildLoopComment - Print comments about child loops within
1517/// the loop for this basic block, with nesting.
1518static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1519                                  unsigned FunctionNumber) {
1520  // Add child loop information
1521  for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
1522    OS.indent((*CL)->getLoopDepth()*2)
1523      << "Child Loop BB" << FunctionNumber << "_"
1524      << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
1525      << '\n';
1526    PrintChildLoopComment(OS, *CL, FunctionNumber);
1527  }
1528}
1529
1530/// EmitComments - Pretty-print comments for basic blocks.
1531static void PrintBasicBlockLoopComments(const MachineBasicBlock &MBB,
1532                                        const MachineLoopInfo *LI,
1533                                        const AsmPrinter &AP) {
1534  // Add loop depth information
1535  const MachineLoop *Loop = LI->getLoopFor(&MBB);
1536  if (Loop == 0) return;
1537
1538  MachineBasicBlock *Header = Loop->getHeader();
1539  assert(Header && "No header for loop");
1540
1541  // If this block is not a loop header, just print out what is the loop header
1542  // and return.
1543  if (Header != &MBB) {
1544    AP.OutStreamer.AddComment("  in Loop: Header=BB" +
1545                              Twine(AP.getFunctionNumber())+"_" +
1546                              Twine(Loop->getHeader()->getNumber())+
1547                              " Depth="+Twine(Loop->getLoopDepth()));
1548    return;
1549  }
1550
1551  // Otherwise, it is a loop header.  Print out information about child and
1552  // parent loops.
1553  raw_ostream &OS = AP.OutStreamer.GetCommentOS();
1554
1555  PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
1556
1557  OS << "=>";
1558  OS.indent(Loop->getLoopDepth()*2-2);
1559
1560  OS << "This ";
1561  if (Loop->empty())
1562    OS << "Inner ";
1563  OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
1564
1565  PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
1566}
1567
1568
1569/// EmitBasicBlockStart - This method prints the label for the specified
1570/// MachineBasicBlock, an alignment (if present) and a comment describing
1571/// it if appropriate.
1572void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
1573  // Emit an alignment directive for this block, if needed.
1574  if (unsigned Align = MBB->getAlignment())
1575    EmitAlignment(Log2_32(Align));
1576
1577  // If the block has its address taken, emit a special label to satisfy
1578  // references to the block. This is done so that we don't need to
1579  // remember the number of this label, and so that we can make
1580  // forward references to labels without knowing what their numbers
1581  // will be.
1582  if (MBB->hasAddressTaken()) {
1583    const BasicBlock *BB = MBB->getBasicBlock();
1584    if (VerboseAsm)
1585      OutStreamer.AddComment("Address Taken");
1586    OutStreamer.EmitLabel(GetBlockAddressSymbol(BB->getParent(), BB));
1587  }
1588
1589  // Print the main label for the block.
1590  if (MBB->pred_empty() || MBB->isOnlyReachableByFallthrough()) {
1591    if (VerboseAsm) {
1592      O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':';
1593      if (const BasicBlock *BB = MBB->getBasicBlock())
1594        if (BB->hasName())
1595          OutStreamer.AddComment("%" + BB->getName());
1596
1597      PrintBasicBlockLoopComments(*MBB, LI, *this);
1598      OutStreamer.AddBlankLine();
1599    }
1600  } else {
1601    if (VerboseAsm) {
1602      if (const BasicBlock *BB = MBB->getBasicBlock())
1603        if (BB->hasName())
1604          OutStreamer.AddComment("%" + BB->getName());
1605      PrintBasicBlockLoopComments(*MBB, LI, *this);
1606    }
1607
1608    OutStreamer.EmitLabel(GetMBBSymbol(MBB->getNumber()));
1609  }
1610}
1611
1612/// printPICJumpTableSetLabel - This method prints a set label for the
1613/// specified MachineBasicBlock for a jumptable entry.
1614void AsmPrinter::printPICJumpTableSetLabel(unsigned uid,
1615                                           const MachineBasicBlock *MBB) const {
1616  if (!MAI->getSetDirective())
1617    return;
1618
1619  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1620    << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ','
1621    << *GetMBBSymbol(MBB->getNumber())
1622    << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1623    << '_' << uid << '\n';
1624}
1625
1626void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
1627                                           const MachineBasicBlock *MBB) const {
1628  if (!MAI->getSetDirective())
1629    return;
1630
1631  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1632    << getFunctionNumber() << '_' << uid << '_' << uid2
1633    << "_set_" << MBB->getNumber() << ','
1634    << *GetMBBSymbol(MBB->getNumber())
1635    << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1636    << '_' << uid << '_' << uid2 << '\n';
1637}
1638
1639void AsmPrinter::printVisibility(const MCSymbol *Sym,
1640                                 unsigned Visibility) const {
1641  if (Visibility == GlobalValue::HiddenVisibility) {
1642    if (const char *Directive = MAI->getHiddenDirective())
1643      O << Directive << *Sym << '\n';
1644  } else if (Visibility == GlobalValue::ProtectedVisibility) {
1645    if (const char *Directive = MAI->getProtectedDirective())
1646      O << Directive << *Sym << '\n';
1647  }
1648}
1649
1650void AsmPrinter::printOffset(int64_t Offset) const {
1651  if (Offset > 0)
1652    O << '+' << Offset;
1653  else if (Offset < 0)
1654    O << Offset;
1655}
1656
1657GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1658  if (!S->usesMetadata())
1659    return 0;
1660
1661  gcp_iterator GCPI = GCMetadataPrinters.find(S);
1662  if (GCPI != GCMetadataPrinters.end())
1663    return GCPI->second;
1664
1665  const char *Name = S->getName().c_str();
1666
1667  for (GCMetadataPrinterRegistry::iterator
1668         I = GCMetadataPrinterRegistry::begin(),
1669         E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1670    if (strcmp(Name, I->getName()) == 0) {
1671      GCMetadataPrinter *GMP = I->instantiate();
1672      GMP->S = S;
1673      GCMetadataPrinters.insert(std::make_pair(S, GMP));
1674      return GMP;
1675    }
1676
1677  errs() << "no GCMetadataPrinter registered for GC: " << Name << "\n";
1678  llvm_unreachable(0);
1679}
1680
1681/// EmitComments - Pretty-print comments for instructions
1682void AsmPrinter::EmitComments(const MachineInstr &MI) const {
1683  if (!VerboseAsm)
1684    return;
1685
1686  bool Newline = false;
1687
1688  if (!MI.getDebugLoc().isUnknown()) {
1689    DILocation DLT = MF->getDILocation(MI.getDebugLoc());
1690
1691    // Print source line info.
1692    O.PadToColumn(MAI->getCommentColumn());
1693    O << MAI->getCommentString() << ' ';
1694    DIScope Scope = DLT.getScope();
1695    // Omit the directory, because it's likely to be long and uninteresting.
1696    if (!Scope.isNull())
1697      O << Scope.getFilename();
1698    else
1699      O << "<unknown>";
1700    O << ':' << DLT.getLineNumber();
1701    if (DLT.getColumnNumber() != 0)
1702      O << ':' << DLT.getColumnNumber();
1703    Newline = true;
1704  }
1705
1706  // Check for spills and reloads
1707  int FI;
1708
1709  const MachineFrameInfo *FrameInfo =
1710    MI.getParent()->getParent()->getFrameInfo();
1711
1712  // We assume a single instruction only has a spill or reload, not
1713  // both.
1714  const MachineMemOperand *MMO;
1715  if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
1716    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1717      MMO = *MI.memoperands_begin();
1718      if (Newline) O << '\n';
1719      O.PadToColumn(MAI->getCommentColumn());
1720      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Reload";
1721      Newline = true;
1722    }
1723  }
1724  else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
1725    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1726      if (Newline) O << '\n';
1727      O.PadToColumn(MAI->getCommentColumn());
1728      O << MAI->getCommentString() << ' '
1729        << MMO->getSize() << "-byte Folded Reload";
1730      Newline = true;
1731    }
1732  }
1733  else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
1734    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1735      MMO = *MI.memoperands_begin();
1736      if (Newline) O << '\n';
1737      O.PadToColumn(MAI->getCommentColumn());
1738      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Spill";
1739      Newline = true;
1740    }
1741  }
1742  else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
1743    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1744      if (Newline) O << '\n';
1745      O.PadToColumn(MAI->getCommentColumn());
1746      O << MAI->getCommentString() << ' '
1747        << MMO->getSize() << "-byte Folded Spill";
1748      Newline = true;
1749    }
1750  }
1751
1752  // Check for spill-induced copies
1753  unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
1754  if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg,
1755                                      SrcSubIdx, DstSubIdx)) {
1756    if (MI.getAsmPrinterFlag(ReloadReuse)) {
1757      if (Newline) O << '\n';
1758      O.PadToColumn(MAI->getCommentColumn());
1759      O << MAI->getCommentString() << " Reload Reuse";
1760    }
1761  }
1762}
1763
1764