AsmPrinter.cpp revision c73e8ebf88f2c21b857296951b4babc6bd404426 
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/GCMetadataPrinter.h"
20#include "llvm/CodeGen/MachineConstantPool.h"
21#include "llvm/CodeGen/MachineFunction.h"
22#include "llvm/CodeGen/MachineJumpTableInfo.h"
23#include "llvm/CodeGen/MachineLoopInfo.h"
24#include "llvm/CodeGen/MachineModuleInfo.h"
25#include "llvm/CodeGen/DwarfWriter.h"
26#include "llvm/Analysis/DebugInfo.h"
27#include "llvm/MC/MCContext.h"
28#include "llvm/MC/MCInst.h"
29#include "llvm/MC/MCSection.h"
30#include "llvm/MC/MCStreamer.h"
31#include "llvm/MC/MCSymbol.h"
32#include "llvm/Support/CommandLine.h"
33#include "llvm/Support/ErrorHandling.h"
34#include "llvm/Support/FormattedStream.h"
35#include "llvm/Support/Mangler.h"
36#include "llvm/MC/MCAsmInfo.h"
37#include "llvm/Target/TargetData.h"
38#include "llvm/Target/TargetLowering.h"
39#include "llvm/Target/TargetLoweringObjectFile.h"
40#include "llvm/Target/TargetOptions.h"
41#include "llvm/Target/TargetRegisterInfo.h"
42#include "llvm/ADT/SmallPtrSet.h"
43#include "llvm/ADT/SmallString.h"
44#include "llvm/ADT/StringExtras.h"
45#include <cerrno>
46using namespace llvm;
47
48static cl::opt<cl::boolOrDefault>
49AsmVerbose("asm-verbose", cl::desc("Add comments to directives."),
50           cl::init(cl::BOU_UNSET));
51
52char AsmPrinter::ID = 0;
53AsmPrinter::AsmPrinter(formatted_raw_ostream &o, TargetMachine &tm,
54                       const MCAsmInfo *T, bool VDef)
55  : MachineFunctionPass(&ID), FunctionNumber(0), O(o),
56    TM(tm), MAI(T), TRI(tm.getRegisterInfo()),
57
58    OutContext(*new MCContext()),
59    // FIXME: Pass instprinter to streamer.
60    OutStreamer(*createAsmStreamer(OutContext, O, *T, 0)),
61
62    LastMI(0), LastFn(0), Counter(~0U),
63    PrevDLT(0, ~0U, ~0U) {
64  DW = 0; MMI = 0;
65  switch (AsmVerbose) {
66  case cl::BOU_UNSET: VerboseAsm = VDef;  break;
67  case cl::BOU_TRUE:  VerboseAsm = true;  break;
68  case cl::BOU_FALSE: VerboseAsm = false; break;
69  }
70}
71
72AsmPrinter::~AsmPrinter() {
73  for (gcp_iterator I = GCMetadataPrinters.begin(),
74                    E = GCMetadataPrinters.end(); I != E; ++I)
75    delete I->second;
76
77  delete &OutStreamer;
78  delete &OutContext;
79}
80
81TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
82  return TM.getTargetLowering()->getObjFileLowering();
83}
84
85/// getCurrentSection() - Return the current section we are emitting to.
86const MCSection *AsmPrinter::getCurrentSection() const {
87  return OutStreamer.getCurrentSection();
88}
89
90
91void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
92  AU.setPreservesAll();
93  MachineFunctionPass::getAnalysisUsage(AU);
94  AU.addRequired<GCModuleInfo>();
95  if (VerboseAsm)
96    AU.addRequired<MachineLoopInfo>();
97}
98
99bool AsmPrinter::doInitialization(Module &M) {
100  // Initialize TargetLoweringObjectFile.
101  const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
102    .Initialize(OutContext, TM);
103
104  Mang = new Mangler(M, MAI->getGlobalPrefix(), MAI->getPrivateGlobalPrefix(),
105                     MAI->getLinkerPrivateGlobalPrefix());
106
107  if (MAI->doesAllowQuotesInName())
108    Mang->setUseQuotes(true);
109
110  if (MAI->doesAllowNameToStartWithDigit())
111    Mang->setSymbolsCanStartWithDigit(true);
112
113  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
114  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
115
116  if (MAI->hasSingleParameterDotFile()) {
117    /* Very minimal debug info. It is ignored if we emit actual
118       debug info. If we don't, this at helps the user find where
119       a function came from. */
120    O << "\t.file\t\"" << M.getModuleIdentifier() << "\"\n";
121  }
122
123  for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
124    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
125      MP->beginAssembly(O, *this, *MAI);
126
127  if (!M.getModuleInlineAsm().empty())
128    O << MAI->getCommentString() << " Start of file scope inline assembly\n"
129      << M.getModuleInlineAsm()
130      << '\n' << MAI->getCommentString()
131      << " End of file scope inline assembly\n";
132
133  MMI = getAnalysisIfAvailable<MachineModuleInfo>();
134  if (MMI)
135    MMI->AnalyzeModule(M);
136  DW = getAnalysisIfAvailable<DwarfWriter>();
137  if (DW)
138    DW->BeginModule(&M, MMI, O, this, MAI);
139
140  return false;
141}
142
143bool AsmPrinter::doFinalization(Module &M) {
144  // Emit global variables.
145  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
146       I != E; ++I)
147    PrintGlobalVariable(I);
148
149  // Emit final debug information.
150  if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
151    DW->EndModule();
152
153  // If the target wants to know about weak references, print them all.
154  if (MAI->getWeakRefDirective()) {
155    // FIXME: This is not lazy, it would be nice to only print weak references
156    // to stuff that is actually used.  Note that doing so would require targets
157    // to notice uses in operands (due to constant exprs etc).  This should
158    // happen with the MC stuff eventually.
159
160    // Print out module-level global variables here.
161    for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
162         I != E; ++I) {
163      if (I->hasExternalWeakLinkage())
164        O << MAI->getWeakRefDirective() << Mang->getMangledName(I) << '\n';
165    }
166
167    for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
168      if (I->hasExternalWeakLinkage())
169        O << MAI->getWeakRefDirective() << Mang->getMangledName(I) << '\n';
170    }
171  }
172
173  if (MAI->getSetDirective()) {
174    O << '\n';
175    for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
176         I != E; ++I) {
177      std::string Name = Mang->getMangledName(I);
178
179      const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
180      std::string Target = Mang->getMangledName(GV);
181
182      if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
183        O << "\t.globl\t" << Name << '\n';
184      else if (I->hasWeakLinkage())
185        O << MAI->getWeakRefDirective() << Name << '\n';
186      else if (!I->hasLocalLinkage())
187        llvm_unreachable("Invalid alias linkage");
188
189      printVisibility(Name, I->getVisibility());
190
191      O << MAI->getSetDirective() << ' ' << Name << ", " << Target << '\n';
192    }
193  }
194
195  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
196  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
197  for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
198    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
199      MP->finishAssembly(O, *this, *MAI);
200
201  // If we don't have any trampolines, then we don't require stack memory
202  // to be executable. Some targets have a directive to declare this.
203  Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
204  if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
205    if (MAI->getNonexecutableStackDirective())
206      O << MAI->getNonexecutableStackDirective() << '\n';
207
208
209  // Allow the target to emit any magic that it wants at the end of the file,
210  // after everything else has gone out.
211  EmitEndOfAsmFile(M);
212
213  delete Mang; Mang = 0;
214  DW = 0; MMI = 0;
215
216  OutStreamer.Finish();
217  return false;
218}
219
220void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
221  // What's my mangled name?
222  CurrentFnName = Mang->getMangledName(MF.getFunction());
223  IncrementFunctionNumber();
224
225  if (VerboseAsm)
226    LI = &getAnalysis<MachineLoopInfo>();
227}
228
229namespace {
230  // SectionCPs - Keep track the alignment, constpool entries per Section.
231  struct SectionCPs {
232    const MCSection *S;
233    unsigned Alignment;
234    SmallVector<unsigned, 4> CPEs;
235    SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {};
236  };
237}
238
239/// EmitConstantPool - Print to the current output stream assembly
240/// representations of the constants in the constant pool MCP. This is
241/// used to print out constants which have been "spilled to memory" by
242/// the code generator.
243///
244void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
245  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
246  if (CP.empty()) return;
247
248  // Calculate sections for constant pool entries. We collect entries to go into
249  // the same section together to reduce amount of section switch statements.
250  SmallVector<SectionCPs, 4> CPSections;
251  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
252    const MachineConstantPoolEntry &CPE = CP[i];
253    unsigned Align = CPE.getAlignment();
254
255    SectionKind Kind;
256    switch (CPE.getRelocationInfo()) {
257    default: llvm_unreachable("Unknown section kind");
258    case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
259    case 1:
260      Kind = SectionKind::getReadOnlyWithRelLocal();
261      break;
262    case 0:
263    switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
264    case 4:  Kind = SectionKind::getMergeableConst4(); break;
265    case 8:  Kind = SectionKind::getMergeableConst8(); break;
266    case 16: Kind = SectionKind::getMergeableConst16();break;
267    default: Kind = SectionKind::getMergeableConst(); break;
268    }
269    }
270
271    const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
272
273    // The number of sections are small, just do a linear search from the
274    // last section to the first.
275    bool Found = false;
276    unsigned SecIdx = CPSections.size();
277    while (SecIdx != 0) {
278      if (CPSections[--SecIdx].S == S) {
279        Found = true;
280        break;
281      }
282    }
283    if (!Found) {
284      SecIdx = CPSections.size();
285      CPSections.push_back(SectionCPs(S, Align));
286    }
287
288    if (Align > CPSections[SecIdx].Alignment)
289      CPSections[SecIdx].Alignment = Align;
290    CPSections[SecIdx].CPEs.push_back(i);
291  }
292
293  // Now print stuff into the calculated sections.
294  for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
295    OutStreamer.SwitchSection(CPSections[i].S);
296    EmitAlignment(Log2_32(CPSections[i].Alignment));
297
298    unsigned Offset = 0;
299    for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
300      unsigned CPI = CPSections[i].CPEs[j];
301      MachineConstantPoolEntry CPE = CP[CPI];
302
303      // Emit inter-object padding for alignment.
304      unsigned AlignMask = CPE.getAlignment() - 1;
305      unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
306      EmitZeros(NewOffset - Offset);
307
308      const Type *Ty = CPE.getType();
309      Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
310
311      O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
312        << CPI << ':';
313      if (VerboseAsm) {
314        O.PadToColumn(MAI->getCommentColumn());
315        O << MAI->getCommentString() << " constant ";
316        WriteTypeSymbolic(O, CPE.getType(), MF->getFunction()->getParent());
317      }
318      O << '\n';
319      if (CPE.isMachineConstantPoolEntry())
320        EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
321      else
322        EmitGlobalConstant(CPE.Val.ConstVal);
323    }
324  }
325}
326
327/// EmitJumpTableInfo - Print assembly representations of the jump tables used
328/// by the current function to the current output stream.
329///
330void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
331                                   MachineFunction &MF) {
332  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
333  if (JT.empty()) return;
334
335  bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
336
337  // Pick the directive to use to print the jump table entries, and switch to
338  // the appropriate section.
339  TargetLowering *LoweringInfo = TM.getTargetLowering();
340
341  const Function *F = MF.getFunction();
342  bool JTInDiffSection = false;
343  if (F->isWeakForLinker() ||
344      (IsPic && !LoweringInfo->usesGlobalOffsetTable())) {
345    // In PIC mode, we need to emit the jump table to the same section as the
346    // function body itself, otherwise the label differences won't make sense.
347    // We should also do if the section name is NULL or function is declared in
348    // discardable section.
349    OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang,
350                                                                    TM));
351  } else {
352    // Otherwise, drop it in the readonly section.
353    const MCSection *ReadOnlySection =
354      getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
355    OutStreamer.SwitchSection(ReadOnlySection);
356    JTInDiffSection = true;
357  }
358
359  EmitAlignment(Log2_32(MJTI->getAlignment()));
360
361  for (unsigned i = 0, e = JT.size(); i != e; ++i) {
362    const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
363
364    // If this jump table was deleted, ignore it.
365    if (JTBBs.empty()) continue;
366
367    // For PIC codegen, if possible we want to use the SetDirective to reduce
368    // the number of relocations the assembler will generate for the jump table.
369    // Set directives are all printed before the jump table itself.
370    SmallPtrSet<MachineBasicBlock*, 16> EmittedSets;
371    if (MAI->getSetDirective() && IsPic)
372      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
373        if (EmittedSets.insert(JTBBs[ii]))
374          printPICJumpTableSetLabel(i, JTBBs[ii]);
375
376    // On some targets (e.g. Darwin) we want to emit two consequtive labels
377    // before each jump table.  The first label is never referenced, but tells
378    // the assembler and linker the extents of the jump table object.  The
379    // second label is actually referenced by the code.
380    if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0]) {
381      O << MAI->getLinkerPrivateGlobalPrefix()
382        << "JTI" << getFunctionNumber() << '_' << i << ":\n";
383    }
384
385    O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
386      << '_' << i << ":\n";
387
388    for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
389      printPICJumpTableEntry(MJTI, JTBBs[ii], i);
390      O << '\n';
391    }
392  }
393}
394
395void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
396                                        const MachineBasicBlock *MBB,
397                                        unsigned uid)  const {
398  bool isPIC = TM.getRelocationModel() == Reloc::PIC_;
399
400  // Use JumpTableDirective otherwise honor the entry size from the jump table
401  // info.
402  const char *JTEntryDirective = MAI->getJumpTableDirective(isPIC);
403  bool HadJTEntryDirective = JTEntryDirective != NULL;
404  if (!HadJTEntryDirective) {
405    JTEntryDirective = MJTI->getEntrySize() == 4 ?
406      MAI->getData32bitsDirective() : MAI->getData64bitsDirective();
407  }
408
409  O << JTEntryDirective << ' ';
410
411  // If we have emitted set directives for the jump table entries, print
412  // them rather than the entries themselves.  If we're emitting PIC, then
413  // emit the table entries as differences between two text section labels.
414  // If we're emitting non-PIC code, then emit the entries as direct
415  // references to the target basic blocks.
416  if (!isPIC) {
417    GetMBBSymbol(MBB->getNumber())->print(O, MAI);
418  } else if (MAI->getSetDirective()) {
419    O << MAI->getPrivateGlobalPrefix() << getFunctionNumber()
420      << '_' << uid << "_set_" << MBB->getNumber();
421  } else {
422    GetMBBSymbol(MBB->getNumber())->print(O, MAI);
423    // If the arch uses custom Jump Table directives, don't calc relative to
424    // JT
425    if (!HadJTEntryDirective)
426      O << '-' << MAI->getPrivateGlobalPrefix() << "JTI"
427        << getFunctionNumber() << '_' << uid;
428  }
429}
430
431
432/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
433/// special global used by LLVM.  If so, emit it and return true, otherwise
434/// do nothing and return false.
435bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
436  if (GV->getName() == "llvm.used") {
437    if (MAI->getUsedDirective() != 0)    // No need to emit this at all.
438      EmitLLVMUsedList(GV->getInitializer());
439    return true;
440  }
441
442  // Ignore debug and non-emitted data.  This handles llvm.compiler.used.
443  if (GV->getSection() == "llvm.metadata" ||
444      GV->hasAvailableExternallyLinkage())
445    return true;
446
447  if (!GV->hasAppendingLinkage()) return false;
448
449  assert(GV->hasInitializer() && "Not a special LLVM global!");
450
451  const TargetData *TD = TM.getTargetData();
452  unsigned Align = Log2_32(TD->getPointerPrefAlignment());
453  if (GV->getName() == "llvm.global_ctors") {
454    OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
455    EmitAlignment(Align, 0);
456    EmitXXStructorList(GV->getInitializer());
457    return true;
458  }
459
460  if (GV->getName() == "llvm.global_dtors") {
461    OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
462    EmitAlignment(Align, 0);
463    EmitXXStructorList(GV->getInitializer());
464    return true;
465  }
466
467  return false;
468}
469
470/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
471/// global in the specified llvm.used list for which emitUsedDirectiveFor
472/// is true, as being used with this directive.
473void AsmPrinter::EmitLLVMUsedList(Constant *List) {
474  const char *Directive = MAI->getUsedDirective();
475
476  // Should be an array of 'i8*'.
477  ConstantArray *InitList = dyn_cast<ConstantArray>(List);
478  if (InitList == 0) return;
479
480  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
481    const GlobalValue *GV =
482      dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
483    if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang)) {
484      O << Directive;
485      EmitConstantValueOnly(InitList->getOperand(i));
486      O << '\n';
487    }
488  }
489}
490
491/// EmitXXStructorList - Emit the ctor or dtor list.  This just prints out the
492/// function pointers, ignoring the init priority.
493void AsmPrinter::EmitXXStructorList(Constant *List) {
494  // Should be an array of '{ int, void ()* }' structs.  The first value is the
495  // init priority, which we ignore.
496  if (!isa<ConstantArray>(List)) return;
497  ConstantArray *InitList = cast<ConstantArray>(List);
498  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
499    if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
500      if (CS->getNumOperands() != 2) return;  // Not array of 2-element structs.
501
502      if (CS->getOperand(1)->isNullValue())
503        return;  // Found a null terminator, exit printing.
504      // Emit the function pointer.
505      EmitGlobalConstant(CS->getOperand(1));
506    }
507}
508
509
510//===----------------------------------------------------------------------===//
511/// LEB 128 number encoding.
512
513/// PrintULEB128 - Print a series of hexidecimal values (separated by commas)
514/// representing an unsigned leb128 value.
515void AsmPrinter::PrintULEB128(unsigned Value) const {
516  char Buffer[20];
517  do {
518    unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
519    Value >>= 7;
520    if (Value) Byte |= 0x80;
521    O << "0x" << utohex_buffer(Byte, Buffer+20);
522    if (Value) O << ", ";
523  } while (Value);
524}
525
526/// PrintSLEB128 - Print a series of hexidecimal values (separated by commas)
527/// representing a signed leb128 value.
528void AsmPrinter::PrintSLEB128(int Value) const {
529  int Sign = Value >> (8 * sizeof(Value) - 1);
530  bool IsMore;
531  char Buffer[20];
532
533  do {
534    unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
535    Value >>= 7;
536    IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
537    if (IsMore) Byte |= 0x80;
538    O << "0x" << utohex_buffer(Byte, Buffer+20);
539    if (IsMore) O << ", ";
540  } while (IsMore);
541}
542
543//===--------------------------------------------------------------------===//
544// Emission and print routines
545//
546
547/// PrintHex - Print a value as a hexidecimal value.
548///
549void AsmPrinter::PrintHex(int Value) const {
550  char Buffer[20];
551  O << "0x" << utohex_buffer(static_cast<unsigned>(Value), Buffer+20);
552}
553
554/// EOL - Print a newline character to asm stream.  If a comment is present
555/// then it will be printed first.  Comments should not contain '\n'.
556void AsmPrinter::EOL() const {
557  O << '\n';
558}
559
560void AsmPrinter::EOL(const std::string &Comment) const {
561  if (VerboseAsm && !Comment.empty()) {
562    O.PadToColumn(MAI->getCommentColumn());
563    O << MAI->getCommentString()
564      << ' '
565      << Comment;
566  }
567  O << '\n';
568}
569
570void AsmPrinter::EOL(const char* Comment) const {
571  if (VerboseAsm && *Comment) {
572    O.PadToColumn(MAI->getCommentColumn());
573    O << MAI->getCommentString()
574      << ' '
575      << Comment;
576  }
577  O << '\n';
578}
579
580static const char *DecodeDWARFEncoding(unsigned Encoding) {
581  switch (Encoding) {
582  case dwarf::DW_EH_PE_absptr:
583    return "absptr";
584  case dwarf::DW_EH_PE_omit:
585    return "omit";
586  case dwarf::DW_EH_PE_pcrel:
587    return "pcrel";
588  case dwarf::DW_EH_PE_udata4:
589    return "udata4";
590  case dwarf::DW_EH_PE_udata8:
591    return "udata8";
592  case dwarf::DW_EH_PE_sdata4:
593    return "sdata4";
594  case dwarf::DW_EH_PE_sdata8:
595    return "sdata8";
596  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4:
597    return "pcrel udata4";
598  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4:
599    return "pcrel sdata4";
600  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8:
601    return "pcrel udata8";
602  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8:
603    return "pcrel sdata8";
604  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata4:
605    return "indirect pcrel udata4";
606  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata4:
607    return "indirect pcrel sdata4";
608  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata8:
609    return "indirect pcrel udata8";
610  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata8:
611    return "indirect pcrel sdata8";
612  }
613
614  return 0;
615}
616
617void AsmPrinter::EOL(const char *Comment, unsigned Encoding) const {
618  if (VerboseAsm && *Comment) {
619    O.PadToColumn(MAI->getCommentColumn());
620    O << MAI->getCommentString()
621      << ' '
622      << Comment;
623
624    if (const char *EncStr = DecodeDWARFEncoding(Encoding))
625      O << " (" << EncStr << ')';
626  }
627  O << '\n';
628}
629
630/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
631/// unsigned leb128 value.
632void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
633  if (MAI->hasLEB128()) {
634    O << "\t.uleb128\t"
635      << Value;
636  } else {
637    O << MAI->getData8bitsDirective();
638    PrintULEB128(Value);
639  }
640}
641
642/// EmitSLEB128Bytes - print an assembler byte data directive to compose a
643/// signed leb128 value.
644void AsmPrinter::EmitSLEB128Bytes(int Value) const {
645  if (MAI->hasLEB128()) {
646    O << "\t.sleb128\t"
647      << Value;
648  } else {
649    O << MAI->getData8bitsDirective();
650    PrintSLEB128(Value);
651  }
652}
653
654/// EmitInt8 - Emit a byte directive and value.
655///
656void AsmPrinter::EmitInt8(int Value) const {
657  O << MAI->getData8bitsDirective();
658  PrintHex(Value & 0xFF);
659}
660
661/// EmitInt16 - Emit a short directive and value.
662///
663void AsmPrinter::EmitInt16(int Value) const {
664  O << MAI->getData16bitsDirective();
665  PrintHex(Value & 0xFFFF);
666}
667
668/// EmitInt32 - Emit a long directive and value.
669///
670void AsmPrinter::EmitInt32(int Value) const {
671  O << MAI->getData32bitsDirective();
672  PrintHex(Value);
673}
674
675/// EmitInt64 - Emit a long long directive and value.
676///
677void AsmPrinter::EmitInt64(uint64_t Value) const {
678  if (MAI->getData64bitsDirective()) {
679    O << MAI->getData64bitsDirective();
680    PrintHex(Value);
681  } else {
682    if (TM.getTargetData()->isBigEndian()) {
683      EmitInt32(unsigned(Value >> 32)); O << '\n';
684      EmitInt32(unsigned(Value));
685    } else {
686      EmitInt32(unsigned(Value)); O << '\n';
687      EmitInt32(unsigned(Value >> 32));
688    }
689  }
690}
691
692/// toOctal - Convert the low order bits of X into an octal digit.
693///
694static inline char toOctal(int X) {
695  return (X&7)+'0';
696}
697
698/// printStringChar - Print a char, escaped if necessary.
699///
700static void printStringChar(formatted_raw_ostream &O, unsigned char C) {
701  if (C == '"') {
702    O << "\\\"";
703  } else if (C == '\\') {
704    O << "\\\\";
705  } else if (isprint((unsigned char)C)) {
706    O << C;
707  } else {
708    switch(C) {
709    case '\b': O << "\\b"; break;
710    case '\f': O << "\\f"; break;
711    case '\n': O << "\\n"; break;
712    case '\r': O << "\\r"; break;
713    case '\t': O << "\\t"; break;
714    default:
715      O << '\\';
716      O << toOctal(C >> 6);
717      O << toOctal(C >> 3);
718      O << toOctal(C >> 0);
719      break;
720    }
721  }
722}
723
724/// EmitString - Emit a string with quotes and a null terminator.
725/// Special characters are emitted properly.
726/// \literal (Eg. '\t') \endliteral
727void AsmPrinter::EmitString(const std::string &String) const {
728  EmitString(String.c_str(), String.size());
729}
730
731void AsmPrinter::EmitString(const char *String, unsigned Size) const {
732  const char* AscizDirective = MAI->getAscizDirective();
733  if (AscizDirective)
734    O << AscizDirective;
735  else
736    O << MAI->getAsciiDirective();
737  O << '\"';
738  for (unsigned i = 0; i < Size; ++i)
739    printStringChar(O, String[i]);
740  if (AscizDirective)
741    O << '\"';
742  else
743    O << "\\0\"";
744}
745
746
747/// EmitFile - Emit a .file directive.
748void AsmPrinter::EmitFile(unsigned Number, const std::string &Name) const {
749  O << "\t.file\t" << Number << " \"";
750  for (unsigned i = 0, N = Name.size(); i < N; ++i)
751    printStringChar(O, Name[i]);
752  O << '\"';
753}
754
755
756//===----------------------------------------------------------------------===//
757
758// EmitAlignment - Emit an alignment directive to the specified power of
759// two boundary.  For example, if you pass in 3 here, you will get an 8
760// byte alignment.  If a global value is specified, and if that global has
761// an explicit alignment requested, it will unconditionally override the
762// alignment request.  However, if ForcedAlignBits is specified, this value
763// has final say: the ultimate alignment will be the max of ForcedAlignBits
764// and the alignment computed with NumBits and the global.
765//
766// The algorithm is:
767//     Align = NumBits;
768//     if (GV && GV->hasalignment) Align = GV->getalignment();
769//     Align = std::max(Align, ForcedAlignBits);
770//
771void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
772                               unsigned ForcedAlignBits,
773                               bool UseFillExpr) const {
774  if (GV && GV->getAlignment())
775    NumBits = Log2_32(GV->getAlignment());
776  NumBits = std::max(NumBits, ForcedAlignBits);
777
778  if (NumBits == 0) return;   // No need to emit alignment.
779
780  unsigned FillValue = 0;
781  if (getCurrentSection()->getKind().isText())
782    FillValue = MAI->getTextAlignFillValue();
783
784  OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0);
785}
786
787/// EmitZeros - Emit a block of zeros.
788///
789void AsmPrinter::EmitZeros(uint64_t NumZeros, unsigned AddrSpace) const {
790  if (NumZeros) {
791    if (MAI->getZeroDirective()) {
792      O << MAI->getZeroDirective() << NumZeros;
793      if (MAI->getZeroDirectiveSuffix())
794        O << MAI->getZeroDirectiveSuffix();
795      O << '\n';
796    } else {
797      for (; NumZeros; --NumZeros)
798        O << MAI->getData8bitsDirective(AddrSpace) << "0\n";
799    }
800  }
801}
802
803// Print out the specified constant, without a storage class.  Only the
804// constants valid in constant expressions can occur here.
805void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
806  if (CV->isNullValue() || isa<UndefValue>(CV))
807    O << '0';
808  else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
809    O << CI->getZExtValue();
810  } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
811    // This is a constant address for a global variable or function. Use the
812    // name of the variable or function as the address value.
813    O << Mang->getMangledName(GV);
814  } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
815    const TargetData *TD = TM.getTargetData();
816    unsigned Opcode = CE->getOpcode();
817    switch (Opcode) {
818    case Instruction::Trunc:
819    case Instruction::ZExt:
820    case Instruction::SExt:
821    case Instruction::FPTrunc:
822    case Instruction::FPExt:
823    case Instruction::UIToFP:
824    case Instruction::SIToFP:
825    case Instruction::FPToUI:
826    case Instruction::FPToSI:
827      llvm_unreachable("FIXME: Don't support this constant cast expr");
828    case Instruction::GetElementPtr: {
829      // generate a symbolic expression for the byte address
830      const Constant *ptrVal = CE->getOperand(0);
831      SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
832      if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
833                                                idxVec.size())) {
834        // Truncate/sext the offset to the pointer size.
835        if (TD->getPointerSizeInBits() != 64) {
836          int SExtAmount = 64-TD->getPointerSizeInBits();
837          Offset = (Offset << SExtAmount) >> SExtAmount;
838        }
839
840        if (Offset)
841          O << '(';
842        EmitConstantValueOnly(ptrVal);
843        if (Offset > 0)
844          O << ") + " << Offset;
845        else if (Offset < 0)
846          O << ") - " << -Offset;
847      } else {
848        EmitConstantValueOnly(ptrVal);
849      }
850      break;
851    }
852    case Instruction::BitCast:
853      return EmitConstantValueOnly(CE->getOperand(0));
854
855    case Instruction::IntToPtr: {
856      // Handle casts to pointers by changing them into casts to the appropriate
857      // integer type.  This promotes constant folding and simplifies this code.
858      Constant *Op = CE->getOperand(0);
859      Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(CV->getContext()),
860                                        false/*ZExt*/);
861      return EmitConstantValueOnly(Op);
862    }
863
864
865    case Instruction::PtrToInt: {
866      // Support only foldable casts to/from pointers that can be eliminated by
867      // changing the pointer to the appropriately sized integer type.
868      Constant *Op = CE->getOperand(0);
869      const Type *Ty = CE->getType();
870
871      // We can emit the pointer value into this slot if the slot is an
872      // integer slot greater or equal to the size of the pointer.
873      if (TD->getTypeAllocSize(Ty) == TD->getTypeAllocSize(Op->getType()))
874        return EmitConstantValueOnly(Op);
875
876      O << "((";
877      EmitConstantValueOnly(Op);
878      APInt ptrMask =
879        APInt::getAllOnesValue(TD->getTypeAllocSizeInBits(Op->getType()));
880
881      SmallString<40> S;
882      ptrMask.toStringUnsigned(S);
883      O << ") & " << S.str() << ')';
884      break;
885    }
886    case Instruction::Add:
887    case Instruction::Sub:
888    case Instruction::And:
889    case Instruction::Or:
890    case Instruction::Xor:
891      O << '(';
892      EmitConstantValueOnly(CE->getOperand(0));
893      O << ')';
894      switch (Opcode) {
895      case Instruction::Add:
896       O << " + ";
897       break;
898      case Instruction::Sub:
899       O << " - ";
900       break;
901      case Instruction::And:
902       O << " & ";
903       break;
904      case Instruction::Or:
905       O << " | ";
906       break;
907      case Instruction::Xor:
908       O << " ^ ";
909       break;
910      default:
911       break;
912      }
913      O << '(';
914      EmitConstantValueOnly(CE->getOperand(1));
915      O << ')';
916      break;
917    default:
918      llvm_unreachable("Unsupported operator!");
919    }
920  } else {
921    llvm_unreachable("Unknown constant value!");
922  }
923}
924
925/// printAsCString - Print the specified array as a C compatible string, only if
926/// the predicate isString is true.
927///
928static void printAsCString(formatted_raw_ostream &O, const ConstantArray *CVA,
929                           unsigned LastElt) {
930  assert(CVA->isString() && "Array is not string compatible!");
931
932  O << '\"';
933  for (unsigned i = 0; i != LastElt; ++i) {
934    unsigned char C =
935        (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
936    printStringChar(O, C);
937  }
938  O << '\"';
939}
940
941/// EmitString - Emit a zero-byte-terminated string constant.
942///
943void AsmPrinter::EmitString(const ConstantArray *CVA) const {
944  unsigned NumElts = CVA->getNumOperands();
945  if (MAI->getAscizDirective() && NumElts &&
946      cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
947    O << MAI->getAscizDirective();
948    printAsCString(O, CVA, NumElts-1);
949  } else {
950    O << MAI->getAsciiDirective();
951    printAsCString(O, CVA, NumElts);
952  }
953  O << '\n';
954}
955
956void AsmPrinter::EmitGlobalConstantArray(const ConstantArray *CVA,
957                                         unsigned AddrSpace) {
958  if (CVA->isString()) {
959    EmitString(CVA);
960  } else { // Not a string.  Print the values in successive locations
961    for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
962      EmitGlobalConstant(CVA->getOperand(i), AddrSpace);
963  }
964}
965
966void AsmPrinter::EmitGlobalConstantVector(const ConstantVector *CP) {
967  const VectorType *PTy = CP->getType();
968
969  for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
970    EmitGlobalConstant(CP->getOperand(I));
971}
972
973void AsmPrinter::EmitGlobalConstantStruct(const ConstantStruct *CVS,
974                                          unsigned AddrSpace) {
975  // Print the fields in successive locations. Pad to align if needed!
976  const TargetData *TD = TM.getTargetData();
977  unsigned Size = TD->getTypeAllocSize(CVS->getType());
978  const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
979  uint64_t sizeSoFar = 0;
980  for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
981    const Constant* field = CVS->getOperand(i);
982
983    // Check if padding is needed and insert one or more 0s.
984    uint64_t fieldSize = TD->getTypeAllocSize(field->getType());
985    uint64_t padSize = ((i == e-1 ? Size : cvsLayout->getElementOffset(i+1))
986                        - cvsLayout->getElementOffset(i)) - fieldSize;
987    sizeSoFar += fieldSize + padSize;
988
989    // Now print the actual field value.
990    EmitGlobalConstant(field, AddrSpace);
991
992    // Insert padding - this may include padding to increase the size of the
993    // current field up to the ABI size (if the struct is not packed) as well
994    // as padding to ensure that the next field starts at the right offset.
995    EmitZeros(padSize, AddrSpace);
996  }
997  assert(sizeSoFar == cvsLayout->getSizeInBytes() &&
998         "Layout of constant struct may be incorrect!");
999}
1000
1001void AsmPrinter::EmitGlobalConstantFP(const ConstantFP *CFP,
1002                                      unsigned AddrSpace) {
1003  // FP Constants are printed as integer constants to avoid losing
1004  // precision...
1005  LLVMContext &Context = CFP->getContext();
1006  const TargetData *TD = TM.getTargetData();
1007  if (CFP->getType() == Type::getDoubleTy(Context)) {
1008    double Val = CFP->getValueAPF().convertToDouble();  // for comment only
1009    uint64_t i = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1010    if (MAI->getData64bitsDirective(AddrSpace)) {
1011      O << MAI->getData64bitsDirective(AddrSpace) << i;
1012      if (VerboseAsm) {
1013        O.PadToColumn(MAI->getCommentColumn());
1014        O << MAI->getCommentString() << " double " << Val;
1015      }
1016      O << '\n';
1017    } else if (TD->isBigEndian()) {
1018      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1019      if (VerboseAsm) {
1020        O.PadToColumn(MAI->getCommentColumn());
1021        O << MAI->getCommentString()
1022          << " most significant word of double " << Val;
1023      }
1024      O << '\n';
1025      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1026      if (VerboseAsm) {
1027        O.PadToColumn(MAI->getCommentColumn());
1028        O << MAI->getCommentString()
1029          << " least significant word of double " << Val;
1030      }
1031      O << '\n';
1032    } else {
1033      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1034      if (VerboseAsm) {
1035        O.PadToColumn(MAI->getCommentColumn());
1036        O << MAI->getCommentString()
1037          << " least significant word of double " << Val;
1038      }
1039      O << '\n';
1040      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1041      if (VerboseAsm) {
1042        O.PadToColumn(MAI->getCommentColumn());
1043        O << MAI->getCommentString()
1044          << " most significant word of double " << Val;
1045      }
1046      O << '\n';
1047    }
1048    return;
1049  } else if (CFP->getType() == Type::getFloatTy(Context)) {
1050    float Val = CFP->getValueAPF().convertToFloat();  // for comment only
1051    O << MAI->getData32bitsDirective(AddrSpace)
1052      << CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1053    if (VerboseAsm) {
1054      O.PadToColumn(MAI->getCommentColumn());
1055      O << MAI->getCommentString() << " float " << Val;
1056    }
1057    O << '\n';
1058    return;
1059  } else if (CFP->getType() == Type::getX86_FP80Ty(Context)) {
1060    // all long double variants are printed as hex
1061    // api needed to prevent premature destruction
1062    APInt api = CFP->getValueAPF().bitcastToAPInt();
1063    const uint64_t *p = api.getRawData();
1064    // Convert to double so we can print the approximate val as a comment.
1065    APFloat DoubleVal = CFP->getValueAPF();
1066    bool ignored;
1067    DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1068                      &ignored);
1069    if (TD->isBigEndian()) {
1070      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1071      if (VerboseAsm) {
1072        O.PadToColumn(MAI->getCommentColumn());
1073        O << MAI->getCommentString()
1074          << " most significant halfword of x86_fp80 ~"
1075          << DoubleVal.convertToDouble();
1076      }
1077      O << '\n';
1078      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1079      if (VerboseAsm) {
1080        O.PadToColumn(MAI->getCommentColumn());
1081        O << MAI->getCommentString() << " next halfword";
1082      }
1083      O << '\n';
1084      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1085      if (VerboseAsm) {
1086        O.PadToColumn(MAI->getCommentColumn());
1087        O << MAI->getCommentString() << " next halfword";
1088      }
1089      O << '\n';
1090      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1091      if (VerboseAsm) {
1092        O.PadToColumn(MAI->getCommentColumn());
1093        O << MAI->getCommentString() << " next halfword";
1094      }
1095      O << '\n';
1096      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1097      if (VerboseAsm) {
1098        O.PadToColumn(MAI->getCommentColumn());
1099        O << MAI->getCommentString()
1100          << " least significant halfword";
1101      }
1102      O << '\n';
1103     } else {
1104      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1105      if (VerboseAsm) {
1106        O.PadToColumn(MAI->getCommentColumn());
1107        O << MAI->getCommentString()
1108          << " least significant halfword of x86_fp80 ~"
1109          << DoubleVal.convertToDouble();
1110      }
1111      O << '\n';
1112      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1113      if (VerboseAsm) {
1114        O.PadToColumn(MAI->getCommentColumn());
1115        O << MAI->getCommentString()
1116          << " next halfword";
1117      }
1118      O << '\n';
1119      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1120      if (VerboseAsm) {
1121        O.PadToColumn(MAI->getCommentColumn());
1122        O << MAI->getCommentString()
1123          << " next halfword";
1124      }
1125      O << '\n';
1126      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1127      if (VerboseAsm) {
1128        O.PadToColumn(MAI->getCommentColumn());
1129        O << MAI->getCommentString()
1130          << " next halfword";
1131      }
1132      O << '\n';
1133      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1134      if (VerboseAsm) {
1135        O.PadToColumn(MAI->getCommentColumn());
1136        O << MAI->getCommentString()
1137          << " most significant halfword";
1138      }
1139      O << '\n';
1140    }
1141    EmitZeros(TD->getTypeAllocSize(Type::getX86_FP80Ty(Context)) -
1142              TD->getTypeStoreSize(Type::getX86_FP80Ty(Context)), AddrSpace);
1143    return;
1144  } else if (CFP->getType() == Type::getPPC_FP128Ty(Context)) {
1145    // all long double variants are printed as hex
1146    // api needed to prevent premature destruction
1147    APInt api = CFP->getValueAPF().bitcastToAPInt();
1148    const uint64_t *p = api.getRawData();
1149    if (TD->isBigEndian()) {
1150      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1151      if (VerboseAsm) {
1152        O.PadToColumn(MAI->getCommentColumn());
1153        O << MAI->getCommentString()
1154          << " most significant word of ppc_fp128";
1155      }
1156      O << '\n';
1157      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1158      if (VerboseAsm) {
1159        O.PadToColumn(MAI->getCommentColumn());
1160        O << MAI->getCommentString()
1161        << " next word";
1162      }
1163      O << '\n';
1164      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1165      if (VerboseAsm) {
1166        O.PadToColumn(MAI->getCommentColumn());
1167        O << MAI->getCommentString()
1168          << " next word";
1169      }
1170      O << '\n';
1171      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
1172      if (VerboseAsm) {
1173        O.PadToColumn(MAI->getCommentColumn());
1174        O << MAI->getCommentString()
1175          << " least significant word";
1176      }
1177      O << '\n';
1178     } else {
1179      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
1180      if (VerboseAsm) {
1181        O.PadToColumn(MAI->getCommentColumn());
1182        O << MAI->getCommentString()
1183          << " least significant word of ppc_fp128";
1184      }
1185      O << '\n';
1186      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1187      if (VerboseAsm) {
1188        O.PadToColumn(MAI->getCommentColumn());
1189        O << MAI->getCommentString()
1190          << " next word";
1191      }
1192      O << '\n';
1193      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1194      if (VerboseAsm) {
1195        O.PadToColumn(MAI->getCommentColumn());
1196        O << MAI->getCommentString()
1197          << " next word";
1198      }
1199      O << '\n';
1200      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1201      if (VerboseAsm) {
1202        O.PadToColumn(MAI->getCommentColumn());
1203        O << MAI->getCommentString()
1204          << " most significant word";
1205      }
1206      O << '\n';
1207    }
1208    return;
1209  } else llvm_unreachable("Floating point constant type not handled");
1210}
1211
1212void AsmPrinter::EmitGlobalConstantLargeInt(const ConstantInt *CI,
1213                                            unsigned AddrSpace) {
1214  const TargetData *TD = TM.getTargetData();
1215  unsigned BitWidth = CI->getBitWidth();
1216  assert(isPowerOf2_32(BitWidth) &&
1217         "Non-power-of-2-sized integers not handled!");
1218
1219  // We don't expect assemblers to support integer data directives
1220  // for more than 64 bits, so we emit the data in at most 64-bit
1221  // quantities at a time.
1222  const uint64_t *RawData = CI->getValue().getRawData();
1223  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1224    uint64_t Val;
1225    if (TD->isBigEndian())
1226      Val = RawData[e - i - 1];
1227    else
1228      Val = RawData[i];
1229
1230    if (MAI->getData64bitsDirective(AddrSpace))
1231      O << MAI->getData64bitsDirective(AddrSpace) << Val << '\n';
1232    else if (TD->isBigEndian()) {
1233      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32);
1234      if (VerboseAsm) {
1235        O.PadToColumn(MAI->getCommentColumn());
1236        O << MAI->getCommentString()
1237          << " most significant half of i64 " << Val;
1238      }
1239      O << '\n';
1240      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(Val);
1241      if (VerboseAsm) {
1242        O.PadToColumn(MAI->getCommentColumn());
1243        O << MAI->getCommentString()
1244          << " least significant half of i64 " << Val;
1245      }
1246      O << '\n';
1247    } else {
1248      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(Val);
1249      if (VerboseAsm) {
1250        O.PadToColumn(MAI->getCommentColumn());
1251        O << MAI->getCommentString()
1252          << " least significant half of i64 " << Val;
1253      }
1254      O << '\n';
1255      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32);
1256      if (VerboseAsm) {
1257        O.PadToColumn(MAI->getCommentColumn());
1258        O << MAI->getCommentString()
1259          << " most significant half of i64 " << Val;
1260      }
1261      O << '\n';
1262    }
1263  }
1264}
1265
1266/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1267void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1268  const TargetData *TD = TM.getTargetData();
1269  const Type *type = CV->getType();
1270  unsigned Size = TD->getTypeAllocSize(type);
1271
1272  if (CV->isNullValue() || isa<UndefValue>(CV)) {
1273    EmitZeros(Size, AddrSpace);
1274    return;
1275  } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
1276    EmitGlobalConstantArray(CVA , AddrSpace);
1277    return;
1278  } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
1279    EmitGlobalConstantStruct(CVS, AddrSpace);
1280    return;
1281  } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
1282    EmitGlobalConstantFP(CFP, AddrSpace);
1283    return;
1284  } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1285    // Small integers are handled below; large integers are handled here.
1286    if (Size > 4) {
1287      EmitGlobalConstantLargeInt(CI, AddrSpace);
1288      return;
1289    }
1290  } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) {
1291    EmitGlobalConstantVector(CP);
1292    return;
1293  }
1294
1295  printDataDirective(type, AddrSpace);
1296  EmitConstantValueOnly(CV);
1297  if (VerboseAsm) {
1298    if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1299      SmallString<40> S;
1300      CI->getValue().toStringUnsigned(S, 16);
1301      O.PadToColumn(MAI->getCommentColumn());
1302      O << MAI->getCommentString() << " 0x" << S.str();
1303    }
1304  }
1305  O << '\n';
1306}
1307
1308void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1309  // Target doesn't support this yet!
1310  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1311}
1312
1313/// PrintSpecial - Print information related to the specified machine instr
1314/// that is independent of the operand, and may be independent of the instr
1315/// itself.  This can be useful for portably encoding the comment character
1316/// or other bits of target-specific knowledge into the asmstrings.  The
1317/// syntax used is ${:comment}.  Targets can override this to add support
1318/// for their own strange codes.
1319void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1320  if (!strcmp(Code, "private")) {
1321    O << MAI->getPrivateGlobalPrefix();
1322  } else if (!strcmp(Code, "comment")) {
1323    if (VerboseAsm)
1324      O << MAI->getCommentString();
1325  } else if (!strcmp(Code, "uid")) {
1326    // Comparing the address of MI isn't sufficient, because machineinstrs may
1327    // be allocated to the same address across functions.
1328    const Function *ThisF = MI->getParent()->getParent()->getFunction();
1329
1330    // If this is a new LastFn instruction, bump the counter.
1331    if (LastMI != MI || LastFn != ThisF) {
1332      ++Counter;
1333      LastMI = MI;
1334      LastFn = ThisF;
1335    }
1336    O << Counter;
1337  } else {
1338    std::string msg;
1339    raw_string_ostream Msg(msg);
1340    Msg << "Unknown special formatter '" << Code
1341         << "' for machine instr: " << *MI;
1342    llvm_report_error(Msg.str());
1343  }
1344}
1345
1346/// processDebugLoc - Processes the debug information of each machine
1347/// instruction's DebugLoc.
1348void AsmPrinter::processDebugLoc(DebugLoc DL) {
1349  if (!MAI || !DW)
1350    return;
1351
1352  if (MAI->doesSupportDebugInformation() && DW->ShouldEmitDwarfDebug()) {
1353    if (!DL.isUnknown()) {
1354      DebugLocTuple CurDLT = MF->getDebugLocTuple(DL);
1355
1356      if (CurDLT.CompileUnit != 0 && PrevDLT != CurDLT) {
1357        printLabel(DW->RecordSourceLine(CurDLT.Line, CurDLT.Col,
1358                                        DICompileUnit(CurDLT.CompileUnit)));
1359        O << '\n';
1360      }
1361
1362      PrevDLT = CurDLT;
1363    }
1364  }
1365}
1366
1367/// printInlineAsm - This method formats and prints the specified machine
1368/// instruction that is an inline asm.
1369void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1370  unsigned NumOperands = MI->getNumOperands();
1371
1372  // Count the number of register definitions.
1373  unsigned NumDefs = 0;
1374  for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1375       ++NumDefs)
1376    assert(NumDefs != NumOperands-1 && "No asm string?");
1377
1378  assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1379
1380  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1381  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1382
1383  // If this asmstr is empty, just print the #APP/#NOAPP markers.
1384  // These are useful to see where empty asm's wound up.
1385  if (AsmStr[0] == 0) {
1386    O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1387    O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
1388    return;
1389  }
1390
1391  O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1392
1393  // The variant of the current asmprinter.
1394  int AsmPrinterVariant = MAI->getAssemblerDialect();
1395
1396  int CurVariant = -1;            // The number of the {.|.|.} region we are in.
1397  const char *LastEmitted = AsmStr; // One past the last character emitted.
1398
1399  while (*LastEmitted) {
1400    switch (*LastEmitted) {
1401    default: {
1402      // Not a special case, emit the string section literally.
1403      const char *LiteralEnd = LastEmitted+1;
1404      while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1405             *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1406        ++LiteralEnd;
1407      if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1408        O.write(LastEmitted, LiteralEnd-LastEmitted);
1409      LastEmitted = LiteralEnd;
1410      break;
1411    }
1412    case '\n':
1413      ++LastEmitted;   // Consume newline character.
1414      O << '\n';       // Indent code with newline.
1415      break;
1416    case '$': {
1417      ++LastEmitted;   // Consume '$' character.
1418      bool Done = true;
1419
1420      // Handle escapes.
1421      switch (*LastEmitted) {
1422      default: Done = false; break;
1423      case '$':     // $$ -> $
1424        if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1425          O << '$';
1426        ++LastEmitted;  // Consume second '$' character.
1427        break;
1428      case '(':             // $( -> same as GCC's { character.
1429        ++LastEmitted;      // Consume '(' character.
1430        if (CurVariant != -1) {
1431          llvm_report_error("Nested variants found in inline asm string: '"
1432                            + std::string(AsmStr) + "'");
1433        }
1434        CurVariant = 0;     // We're in the first variant now.
1435        break;
1436      case '|':
1437        ++LastEmitted;  // consume '|' character.
1438        if (CurVariant == -1)
1439          O << '|';       // this is gcc's behavior for | outside a variant
1440        else
1441          ++CurVariant;   // We're in the next variant.
1442        break;
1443      case ')':         // $) -> same as GCC's } char.
1444        ++LastEmitted;  // consume ')' character.
1445        if (CurVariant == -1)
1446          O << '}';     // this is gcc's behavior for } outside a variant
1447        else
1448          CurVariant = -1;
1449        break;
1450      }
1451      if (Done) break;
1452
1453      bool HasCurlyBraces = false;
1454      if (*LastEmitted == '{') {     // ${variable}
1455        ++LastEmitted;               // Consume '{' character.
1456        HasCurlyBraces = true;
1457      }
1458
1459      // If we have ${:foo}, then this is not a real operand reference, it is a
1460      // "magic" string reference, just like in .td files.  Arrange to call
1461      // PrintSpecial.
1462      if (HasCurlyBraces && *LastEmitted == ':') {
1463        ++LastEmitted;
1464        const char *StrStart = LastEmitted;
1465        const char *StrEnd = strchr(StrStart, '}');
1466        if (StrEnd == 0) {
1467          llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1468                            + std::string(AsmStr) + "'");
1469        }
1470
1471        std::string Val(StrStart, StrEnd);
1472        PrintSpecial(MI, Val.c_str());
1473        LastEmitted = StrEnd+1;
1474        break;
1475      }
1476
1477      const char *IDStart = LastEmitted;
1478      char *IDEnd;
1479      errno = 0;
1480      long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1481      if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1482        llvm_report_error("Bad $ operand number in inline asm string: '"
1483                          + std::string(AsmStr) + "'");
1484      }
1485      LastEmitted = IDEnd;
1486
1487      char Modifier[2] = { 0, 0 };
1488
1489      if (HasCurlyBraces) {
1490        // If we have curly braces, check for a modifier character.  This
1491        // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1492        if (*LastEmitted == ':') {
1493          ++LastEmitted;    // Consume ':' character.
1494          if (*LastEmitted == 0) {
1495            llvm_report_error("Bad ${:} expression in inline asm string: '"
1496                              + std::string(AsmStr) + "'");
1497          }
1498
1499          Modifier[0] = *LastEmitted;
1500          ++LastEmitted;    // Consume modifier character.
1501        }
1502
1503        if (*LastEmitted != '}') {
1504          llvm_report_error("Bad ${} expression in inline asm string: '"
1505                            + std::string(AsmStr) + "'");
1506        }
1507        ++LastEmitted;    // Consume '}' character.
1508      }
1509
1510      if ((unsigned)Val >= NumOperands-1) {
1511        llvm_report_error("Invalid $ operand number in inline asm string: '"
1512                          + std::string(AsmStr) + "'");
1513      }
1514
1515      // Okay, we finally have a value number.  Ask the target to print this
1516      // operand!
1517      if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1518        unsigned OpNo = 1;
1519
1520        bool Error = false;
1521
1522        // Scan to find the machine operand number for the operand.
1523        for (; Val; --Val) {
1524          if (OpNo >= MI->getNumOperands()) break;
1525          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1526          OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1527        }
1528
1529        if (OpNo >= MI->getNumOperands()) {
1530          Error = true;
1531        } else {
1532          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1533          ++OpNo;  // Skip over the ID number.
1534
1535          if (Modifier[0]=='l')  // labels are target independent
1536            GetMBBSymbol(MI->getOperand(OpNo).getMBB()
1537                           ->getNumber())->print(O, MAI);
1538          else {
1539            AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1540            if ((OpFlags & 7) == 4) {
1541              Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1542                                                Modifier[0] ? Modifier : 0);
1543            } else {
1544              Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1545                                          Modifier[0] ? Modifier : 0);
1546            }
1547          }
1548        }
1549        if (Error) {
1550          std::string msg;
1551          raw_string_ostream Msg(msg);
1552          Msg << "Invalid operand found in inline asm: '"
1553               << AsmStr << "'\n";
1554          MI->print(Msg);
1555          llvm_report_error(Msg.str());
1556        }
1557      }
1558      break;
1559    }
1560    }
1561  }
1562  O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd();
1563}
1564
1565/// printImplicitDef - This method prints the specified machine instruction
1566/// that is an implicit def.
1567void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1568  if (!VerboseAsm) return;
1569  O.PadToColumn(MAI->getCommentColumn());
1570  O << MAI->getCommentString() << " implicit-def: "
1571    << TRI->getName(MI->getOperand(0).getReg());
1572}
1573
1574/// printLabel - This method prints a local label used by debug and
1575/// exception handling tables.
1576void AsmPrinter::printLabel(const MachineInstr *MI) const {
1577  printLabel(MI->getOperand(0).getImm());
1578}
1579
1580void AsmPrinter::printLabel(unsigned Id) const {
1581  O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':';
1582}
1583
1584/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1585/// instruction, using the specified assembler variant.  Targets should
1586/// overried this to format as appropriate.
1587bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1588                                 unsigned AsmVariant, const char *ExtraCode) {
1589  // Target doesn't support this yet!
1590  return true;
1591}
1592
1593bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1594                                       unsigned AsmVariant,
1595                                       const char *ExtraCode) {
1596  // Target doesn't support this yet!
1597  return true;
1598}
1599
1600MCSymbol *AsmPrinter::GetMBBSymbol(unsigned MBBID) const {
1601  SmallString<60> Name;
1602  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "BB"
1603    << getFunctionNumber() << '_' << MBBID;
1604
1605  return OutContext.GetOrCreateSymbol(Name.str());
1606}
1607
1608
1609/// EmitBasicBlockStart - This method prints the label for the specified
1610/// MachineBasicBlock, an alignment (if present) and a comment describing
1611/// it if appropriate.
1612void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
1613  if (unsigned Align = MBB->getAlignment())
1614    EmitAlignment(Log2_32(Align));
1615
1616  GetMBBSymbol(MBB->getNumber())->print(O, MAI);
1617  O << ':';
1618
1619  if (VerboseAsm) {
1620    if (const BasicBlock *BB = MBB->getBasicBlock())
1621      if (BB->hasName()) {
1622        O.PadToColumn(MAI->getCommentColumn());
1623        O << MAI->getCommentString() << ' ';
1624        WriteAsOperand(O, BB, /*PrintType=*/false);
1625      }
1626
1627    EmitComments(*MBB);
1628  }
1629}
1630
1631/// printPICJumpTableSetLabel - This method prints a set label for the
1632/// specified MachineBasicBlock for a jumptable entry.
1633void AsmPrinter::printPICJumpTableSetLabel(unsigned uid,
1634                                           const MachineBasicBlock *MBB) const {
1635  if (!MAI->getSetDirective())
1636    return;
1637
1638  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1639    << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
1640  GetMBBSymbol(MBB->getNumber())->print(O, MAI);
1641  O << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1642    << '_' << uid << '\n';
1643}
1644
1645void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
1646                                           const MachineBasicBlock *MBB) const {
1647  if (!MAI->getSetDirective())
1648    return;
1649
1650  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1651    << getFunctionNumber() << '_' << uid << '_' << uid2
1652    << "_set_" << MBB->getNumber() << ',';
1653  GetMBBSymbol(MBB->getNumber())->print(O, MAI);
1654  O << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1655    << '_' << uid << '_' << uid2 << '\n';
1656}
1657
1658/// printDataDirective - This method prints the asm directive for the
1659/// specified type.
1660void AsmPrinter::printDataDirective(const Type *type, unsigned AddrSpace) {
1661  const TargetData *TD = TM.getTargetData();
1662  switch (type->getTypeID()) {
1663  case Type::FloatTyID: case Type::DoubleTyID:
1664  case Type::X86_FP80TyID: case Type::FP128TyID: case Type::PPC_FP128TyID:
1665    assert(0 && "Should have already output floating point constant.");
1666  default:
1667    assert(0 && "Can't handle printing this type of thing");
1668  case Type::IntegerTyID: {
1669    unsigned BitWidth = cast<IntegerType>(type)->getBitWidth();
1670    if (BitWidth <= 8)
1671      O << MAI->getData8bitsDirective(AddrSpace);
1672    else if (BitWidth <= 16)
1673      O << MAI->getData16bitsDirective(AddrSpace);
1674    else if (BitWidth <= 32)
1675      O << MAI->getData32bitsDirective(AddrSpace);
1676    else if (BitWidth <= 64) {
1677      assert(MAI->getData64bitsDirective(AddrSpace) &&
1678             "Target cannot handle 64-bit constant exprs!");
1679      O << MAI->getData64bitsDirective(AddrSpace);
1680    } else {
1681      llvm_unreachable("Target cannot handle given data directive width!");
1682    }
1683    break;
1684  }
1685  case Type::PointerTyID:
1686    if (TD->getPointerSize() == 8) {
1687      assert(MAI->getData64bitsDirective(AddrSpace) &&
1688             "Target cannot handle 64-bit pointer exprs!");
1689      O << MAI->getData64bitsDirective(AddrSpace);
1690    } else if (TD->getPointerSize() == 2) {
1691      O << MAI->getData16bitsDirective(AddrSpace);
1692    } else if (TD->getPointerSize() == 1) {
1693      O << MAI->getData8bitsDirective(AddrSpace);
1694    } else {
1695      O << MAI->getData32bitsDirective(AddrSpace);
1696    }
1697    break;
1698  }
1699}
1700
1701void AsmPrinter::printVisibility(const std::string& Name,
1702                                 unsigned Visibility) const {
1703  if (Visibility == GlobalValue::HiddenVisibility) {
1704    if (const char *Directive = MAI->getHiddenDirective())
1705      O << Directive << Name << '\n';
1706  } else if (Visibility == GlobalValue::ProtectedVisibility) {
1707    if (const char *Directive = MAI->getProtectedDirective())
1708      O << Directive << Name << '\n';
1709  }
1710}
1711
1712void AsmPrinter::printOffset(int64_t Offset) const {
1713  if (Offset > 0)
1714    O << '+' << Offset;
1715  else if (Offset < 0)
1716    O << Offset;
1717}
1718
1719GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1720  if (!S->usesMetadata())
1721    return 0;
1722
1723  gcp_iterator GCPI = GCMetadataPrinters.find(S);
1724  if (GCPI != GCMetadataPrinters.end())
1725    return GCPI->second;
1726
1727  const char *Name = S->getName().c_str();
1728
1729  for (GCMetadataPrinterRegistry::iterator
1730         I = GCMetadataPrinterRegistry::begin(),
1731         E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1732    if (strcmp(Name, I->getName()) == 0) {
1733      GCMetadataPrinter *GMP = I->instantiate();
1734      GMP->S = S;
1735      GCMetadataPrinters.insert(std::make_pair(S, GMP));
1736      return GMP;
1737    }
1738
1739  errs() << "no GCMetadataPrinter registered for GC: " << Name << "\n";
1740  llvm_unreachable(0);
1741}
1742
1743/// EmitComments - Pretty-print comments for instructions
1744void AsmPrinter::EmitComments(const MachineInstr &MI) const {
1745  assert(VerboseAsm && !MI.getDebugLoc().isUnknown());
1746
1747  DebugLocTuple DLT = MF->getDebugLocTuple(MI.getDebugLoc());
1748
1749  // Print source line info.
1750  O.PadToColumn(MAI->getCommentColumn());
1751  O << MAI->getCommentString() << " SrcLine ";
1752  if (DLT.CompileUnit) {
1753    std::string Str;
1754    DICompileUnit CU(DLT.CompileUnit);
1755    O << CU.getFilename(Str) << " ";
1756  }
1757  O << DLT.Line;
1758  if (DLT.Col != 0)
1759    O << ":" << DLT.Col;
1760}
1761
1762/// PrintChildLoopComment - Print comments about child loops within
1763/// the loop for this basic block, with nesting.
1764///
1765static void PrintChildLoopComment(formatted_raw_ostream &O,
1766                                  const MachineLoop *loop,
1767                                  const MCAsmInfo *MAI,
1768                                  int FunctionNumber) {
1769  // Add child loop information
1770  for(MachineLoop::iterator cl = loop->begin(),
1771        clend = loop->end();
1772      cl != clend;
1773      ++cl) {
1774    MachineBasicBlock *Header = (*cl)->getHeader();
1775    assert(Header && "No header for loop");
1776
1777    O << '\n';
1778    O.PadToColumn(MAI->getCommentColumn());
1779
1780    O << MAI->getCommentString();
1781    O.indent(((*cl)->getLoopDepth()-1)*2)
1782      << " Child Loop BB" << FunctionNumber << "_"
1783      << Header->getNumber() << " Depth " << (*cl)->getLoopDepth();
1784
1785    PrintChildLoopComment(O, *cl, MAI, FunctionNumber);
1786  }
1787}
1788
1789/// EmitComments - Pretty-print comments for basic blocks
1790void AsmPrinter::EmitComments(const MachineBasicBlock &MBB) const
1791{
1792  if (VerboseAsm) {
1793    // Add loop depth information
1794    const MachineLoop *loop = LI->getLoopFor(&MBB);
1795
1796    if (loop) {
1797      // Print a newline after bb# annotation.
1798      O << "\n";
1799      O.PadToColumn(MAI->getCommentColumn());
1800      O << MAI->getCommentString() << " Loop Depth " << loop->getLoopDepth()
1801        << '\n';
1802
1803      O.PadToColumn(MAI->getCommentColumn());
1804
1805      MachineBasicBlock *Header = loop->getHeader();
1806      assert(Header && "No header for loop");
1807
1808      if (Header == &MBB) {
1809        O << MAI->getCommentString() << " Loop Header";
1810        PrintChildLoopComment(O, loop, MAI, getFunctionNumber());
1811      }
1812      else {
1813        O << MAI->getCommentString() << " Loop Header is BB"
1814          << getFunctionNumber() << "_" << loop->getHeader()->getNumber();
1815      }
1816
1817      if (loop->empty()) {
1818        O << '\n';
1819        O.PadToColumn(MAI->getCommentColumn());
1820        O << MAI->getCommentString() << " Inner Loop";
1821      }
1822
1823      // Add parent loop information
1824      for (const MachineLoop *CurLoop = loop->getParentLoop();
1825           CurLoop;
1826           CurLoop = CurLoop->getParentLoop()) {
1827        MachineBasicBlock *Header = CurLoop->getHeader();
1828        assert(Header && "No header for loop");
1829
1830        O << '\n';
1831        O.PadToColumn(MAI->getCommentColumn());
1832        O << MAI->getCommentString();
1833        O.indent((CurLoop->getLoopDepth()-1)*2)
1834          << " Inside Loop BB" << getFunctionNumber() << "_"
1835          << Header->getNumber() << " Depth " << CurLoop->getLoopDepth();
1836      }
1837    }
1838  }
1839}
1840