AsmPrinter.cpp revision bd23d5fda85e38c88dfa668a99777cd05c524822 
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  if (MAI->doesSupportDebugInformation() ||
134      MAI->doesSupportExceptionHandling()) {
135    MMI = getAnalysisIfAvailable<MachineModuleInfo>();
136    if (MMI)
137      MMI->AnalyzeModule(M);
138    DW = getAnalysisIfAvailable<DwarfWriter>();
139    if (DW)
140      DW->BeginModule(&M, MMI, O, this, MAI);
141  }
142
143  return false;
144}
145
146bool AsmPrinter::doFinalization(Module &M) {
147  // Emit global variables.
148  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
149       I != E; ++I)
150    PrintGlobalVariable(I);
151
152  // Emit final debug information.
153  if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
154    DW->EndModule();
155
156  // If the target wants to know about weak references, print them all.
157  if (MAI->getWeakRefDirective()) {
158    // FIXME: This is not lazy, it would be nice to only print weak references
159    // to stuff that is actually used.  Note that doing so would require targets
160    // to notice uses in operands (due to constant exprs etc).  This should
161    // happen with the MC stuff eventually.
162
163    // Print out module-level global variables here.
164    for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
165         I != E; ++I) {
166      if (I->hasExternalWeakLinkage())
167        O << MAI->getWeakRefDirective() << Mang->getMangledName(I) << '\n';
168    }
169
170    for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
171      if (I->hasExternalWeakLinkage())
172        O << MAI->getWeakRefDirective() << Mang->getMangledName(I) << '\n';
173    }
174  }
175
176  if (MAI->getSetDirective()) {
177    O << '\n';
178    for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
179         I != E; ++I) {
180      std::string Name = Mang->getMangledName(I);
181
182      const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
183      std::string Target = Mang->getMangledName(GV);
184
185      if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
186        O << "\t.globl\t" << Name << '\n';
187      else if (I->hasWeakLinkage())
188        O << MAI->getWeakRefDirective() << Name << '\n';
189      else if (!I->hasLocalLinkage())
190        llvm_unreachable("Invalid alias linkage");
191
192      printVisibility(Name, I->getVisibility());
193
194      O << MAI->getSetDirective() << ' ' << Name << ", " << Target << '\n';
195    }
196  }
197
198  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
199  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
200  for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
201    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
202      MP->finishAssembly(O, *this, *MAI);
203
204  // If we don't have any trampolines, then we don't require stack memory
205  // to be executable. Some targets have a directive to declare this.
206  Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
207  if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
208    if (MAI->getNonexecutableStackDirective())
209      O << MAI->getNonexecutableStackDirective() << '\n';
210
211
212  // Allow the target to emit any magic that it wants at the end of the file,
213  // after everything else has gone out.
214  EmitEndOfAsmFile(M);
215
216  delete Mang; Mang = 0;
217  DW = 0; MMI = 0;
218
219  OutStreamer.Finish();
220  return false;
221}
222
223void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
224  // What's my mangled name?
225  CurrentFnName = Mang->getMangledName(MF.getFunction());
226  IncrementFunctionNumber();
227
228  if (VerboseAsm)
229    LI = &getAnalysis<MachineLoopInfo>();
230}
231
232namespace {
233  // SectionCPs - Keep track the alignment, constpool entries per Section.
234  struct SectionCPs {
235    const MCSection *S;
236    unsigned Alignment;
237    SmallVector<unsigned, 4> CPEs;
238    SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {};
239  };
240}
241
242/// EmitConstantPool - Print to the current output stream assembly
243/// representations of the constants in the constant pool MCP. This is
244/// used to print out constants which have been "spilled to memory" by
245/// the code generator.
246///
247void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
248  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
249  if (CP.empty()) return;
250
251  // Calculate sections for constant pool entries. We collect entries to go into
252  // the same section together to reduce amount of section switch statements.
253  SmallVector<SectionCPs, 4> CPSections;
254  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
255    const MachineConstantPoolEntry &CPE = CP[i];
256    unsigned Align = CPE.getAlignment();
257
258    SectionKind Kind;
259    switch (CPE.getRelocationInfo()) {
260    default: llvm_unreachable("Unknown section kind");
261    case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
262    case 1:
263      Kind = SectionKind::getReadOnlyWithRelLocal();
264      break;
265    case 0:
266    switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
267    case 4:  Kind = SectionKind::getMergeableConst4(); break;
268    case 8:  Kind = SectionKind::getMergeableConst8(); break;
269    case 16: Kind = SectionKind::getMergeableConst16();break;
270    default: Kind = SectionKind::getMergeableConst(); break;
271    }
272    }
273
274    const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
275
276    // The number of sections are small, just do a linear search from the
277    // last section to the first.
278    bool Found = false;
279    unsigned SecIdx = CPSections.size();
280    while (SecIdx != 0) {
281      if (CPSections[--SecIdx].S == S) {
282        Found = true;
283        break;
284      }
285    }
286    if (!Found) {
287      SecIdx = CPSections.size();
288      CPSections.push_back(SectionCPs(S, Align));
289    }
290
291    if (Align > CPSections[SecIdx].Alignment)
292      CPSections[SecIdx].Alignment = Align;
293    CPSections[SecIdx].CPEs.push_back(i);
294  }
295
296  // Now print stuff into the calculated sections.
297  for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
298    OutStreamer.SwitchSection(CPSections[i].S);
299    EmitAlignment(Log2_32(CPSections[i].Alignment));
300
301    unsigned Offset = 0;
302    for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
303      unsigned CPI = CPSections[i].CPEs[j];
304      MachineConstantPoolEntry CPE = CP[CPI];
305
306      // Emit inter-object padding for alignment.
307      unsigned AlignMask = CPE.getAlignment() - 1;
308      unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
309      EmitZeros(NewOffset - Offset);
310
311      const Type *Ty = CPE.getType();
312      Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
313
314      O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
315        << CPI << ':';
316      if (VerboseAsm) {
317        O.PadToColumn(MAI->getCommentColumn());
318        O << MAI->getCommentString() << " constant ";
319        WriteTypeSymbolic(O, CPE.getType(), MF->getFunction()->getParent());
320      }
321      O << '\n';
322      if (CPE.isMachineConstantPoolEntry())
323        EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
324      else
325        EmitGlobalConstant(CPE.Val.ConstVal);
326    }
327  }
328}
329
330/// EmitJumpTableInfo - Print assembly representations of the jump tables used
331/// by the current function to the current output stream.
332///
333void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
334                                   MachineFunction &MF) {
335  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
336  if (JT.empty()) return;
337
338  bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
339
340  // Pick the directive to use to print the jump table entries, and switch to
341  // the appropriate section.
342  TargetLowering *LoweringInfo = TM.getTargetLowering();
343
344  const Function *F = MF.getFunction();
345  bool JTInDiffSection = false;
346  if (F->isWeakForLinker() ||
347      (IsPic && !LoweringInfo->usesGlobalOffsetTable())) {
348    // In PIC mode, we need to emit the jump table to the same section as the
349    // function body itself, otherwise the label differences won't make sense.
350    // We should also do if the section name is NULL or function is declared in
351    // discardable section.
352    OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang,
353                                                                    TM));
354  } else {
355    // Otherwise, drop it in the readonly section.
356    const MCSection *ReadOnlySection =
357      getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
358    OutStreamer.SwitchSection(ReadOnlySection);
359    JTInDiffSection = true;
360  }
361
362  EmitAlignment(Log2_32(MJTI->getAlignment()));
363
364  for (unsigned i = 0, e = JT.size(); i != e; ++i) {
365    const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
366
367    // If this jump table was deleted, ignore it.
368    if (JTBBs.empty()) continue;
369
370    // For PIC codegen, if possible we want to use the SetDirective to reduce
371    // the number of relocations the assembler will generate for the jump table.
372    // Set directives are all printed before the jump table itself.
373    SmallPtrSet<MachineBasicBlock*, 16> EmittedSets;
374    if (MAI->getSetDirective() && IsPic)
375      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
376        if (EmittedSets.insert(JTBBs[ii]))
377          printPICJumpTableSetLabel(i, JTBBs[ii]);
378
379    // On some targets (e.g. Darwin) we want to emit two consequtive labels
380    // before each jump table.  The first label is never referenced, but tells
381    // the assembler and linker the extents of the jump table object.  The
382    // second label is actually referenced by the code.
383    if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0]) {
384      O << MAI->getLinkerPrivateGlobalPrefix()
385        << "JTI" << getFunctionNumber() << '_' << i << ":\n";
386    }
387
388    O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
389      << '_' << i << ":\n";
390
391    for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
392      printPICJumpTableEntry(MJTI, JTBBs[ii], i);
393      O << '\n';
394    }
395  }
396}
397
398void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
399                                        const MachineBasicBlock *MBB,
400                                        unsigned uid)  const {
401  bool isPIC = TM.getRelocationModel() == Reloc::PIC_;
402
403  // Use JumpTableDirective otherwise honor the entry size from the jump table
404  // info.
405  const char *JTEntryDirective = MAI->getJumpTableDirective(isPIC);
406  bool HadJTEntryDirective = JTEntryDirective != NULL;
407  if (!HadJTEntryDirective) {
408    JTEntryDirective = MJTI->getEntrySize() == 4 ?
409      MAI->getData32bitsDirective() : MAI->getData64bitsDirective();
410  }
411
412  O << JTEntryDirective << ' ';
413
414  // If we have emitted set directives for the jump table entries, print
415  // them rather than the entries themselves.  If we're emitting PIC, then
416  // emit the table entries as differences between two text section labels.
417  // If we're emitting non-PIC code, then emit the entries as direct
418  // references to the target basic blocks.
419  if (!isPIC) {
420    GetMBBSymbol(MBB->getNumber())->print(O, MAI);
421  } else if (MAI->getSetDirective()) {
422    O << MAI->getPrivateGlobalPrefix() << getFunctionNumber()
423      << '_' << uid << "_set_" << MBB->getNumber();
424  } else {
425    GetMBBSymbol(MBB->getNumber())->print(O, MAI);
426    // If the arch uses custom Jump Table directives, don't calc relative to
427    // JT
428    if (!HadJTEntryDirective)
429      O << '-' << MAI->getPrivateGlobalPrefix() << "JTI"
430        << getFunctionNumber() << '_' << uid;
431  }
432}
433
434
435/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
436/// special global used by LLVM.  If so, emit it and return true, otherwise
437/// do nothing and return false.
438bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
439  if (GV->getName() == "llvm.used") {
440    if (MAI->getUsedDirective() != 0)    // No need to emit this at all.
441      EmitLLVMUsedList(GV->getInitializer());
442    return true;
443  }
444
445  // Ignore debug and non-emitted data.  This handles llvm.compiler.used.
446  if (GV->getSection() == "llvm.metadata" ||
447      GV->hasAvailableExternallyLinkage())
448    return true;
449
450  if (!GV->hasAppendingLinkage()) return false;
451
452  assert(GV->hasInitializer() && "Not a special LLVM global!");
453
454  const TargetData *TD = TM.getTargetData();
455  unsigned Align = Log2_32(TD->getPointerPrefAlignment());
456  if (GV->getName() == "llvm.global_ctors") {
457    OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
458    EmitAlignment(Align, 0);
459    EmitXXStructorList(GV->getInitializer());
460    return true;
461  }
462
463  if (GV->getName() == "llvm.global_dtors") {
464    OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
465    EmitAlignment(Align, 0);
466    EmitXXStructorList(GV->getInitializer());
467    return true;
468  }
469
470  return false;
471}
472
473/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
474/// global in the specified llvm.used list for which emitUsedDirectiveFor
475/// is true, as being used with this directive.
476void AsmPrinter::EmitLLVMUsedList(Constant *List) {
477  const char *Directive = MAI->getUsedDirective();
478
479  // Should be an array of 'i8*'.
480  ConstantArray *InitList = dyn_cast<ConstantArray>(List);
481  if (InitList == 0) return;
482
483  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
484    const GlobalValue *GV =
485      dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
486    if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang)) {
487      O << Directive;
488      EmitConstantValueOnly(InitList->getOperand(i));
489      O << '\n';
490    }
491  }
492}
493
494/// EmitXXStructorList - Emit the ctor or dtor list.  This just prints out the
495/// function pointers, ignoring the init priority.
496void AsmPrinter::EmitXXStructorList(Constant *List) {
497  // Should be an array of '{ int, void ()* }' structs.  The first value is the
498  // init priority, which we ignore.
499  if (!isa<ConstantArray>(List)) return;
500  ConstantArray *InitList = cast<ConstantArray>(List);
501  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
502    if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
503      if (CS->getNumOperands() != 2) return;  // Not array of 2-element structs.
504
505      if (CS->getOperand(1)->isNullValue())
506        return;  // Found a null terminator, exit printing.
507      // Emit the function pointer.
508      EmitGlobalConstant(CS->getOperand(1));
509    }
510}
511
512
513//===----------------------------------------------------------------------===//
514/// LEB 128 number encoding.
515
516/// PrintULEB128 - Print a series of hexidecimal values (separated by commas)
517/// representing an unsigned leb128 value.
518void AsmPrinter::PrintULEB128(unsigned Value) const {
519  char Buffer[20];
520  do {
521    unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
522    Value >>= 7;
523    if (Value) Byte |= 0x80;
524    O << "0x" << utohex_buffer(Byte, Buffer+20);
525    if (Value) O << ", ";
526  } while (Value);
527}
528
529/// PrintSLEB128 - Print a series of hexidecimal values (separated by commas)
530/// representing a signed leb128 value.
531void AsmPrinter::PrintSLEB128(int Value) const {
532  int Sign = Value >> (8 * sizeof(Value) - 1);
533  bool IsMore;
534  char Buffer[20];
535
536  do {
537    unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
538    Value >>= 7;
539    IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
540    if (IsMore) Byte |= 0x80;
541    O << "0x" << utohex_buffer(Byte, Buffer+20);
542    if (IsMore) O << ", ";
543  } while (IsMore);
544}
545
546//===--------------------------------------------------------------------===//
547// Emission and print routines
548//
549
550/// PrintHex - Print a value as a hexidecimal value.
551///
552void AsmPrinter::PrintHex(int Value) const {
553  char Buffer[20];
554  O << "0x" << utohex_buffer(static_cast<unsigned>(Value), Buffer+20);
555}
556
557/// EOL - Print a newline character to asm stream.  If a comment is present
558/// then it will be printed first.  Comments should not contain '\n'.
559void AsmPrinter::EOL() const {
560  O << '\n';
561}
562
563void AsmPrinter::EOL(const std::string &Comment) const {
564  if (VerboseAsm && !Comment.empty()) {
565    O.PadToColumn(MAI->getCommentColumn());
566    O << MAI->getCommentString()
567      << ' '
568      << Comment;
569  }
570  O << '\n';
571}
572
573void AsmPrinter::EOL(const char* Comment) const {
574  if (VerboseAsm && *Comment) {
575    O.PadToColumn(MAI->getCommentColumn());
576    O << MAI->getCommentString()
577      << ' '
578      << Comment;
579  }
580  O << '\n';
581}
582
583static const char *DecodeDWARFEncoding(unsigned Encoding) {
584  switch (Encoding) {
585  case dwarf::DW_EH_PE_absptr:
586    return "absptr";
587  case dwarf::DW_EH_PE_omit:
588    return "omit";
589  case dwarf::DW_EH_PE_pcrel:
590    return "pcrel";
591  case dwarf::DW_EH_PE_udata4:
592    return "udata4";
593  case dwarf::DW_EH_PE_udata8:
594    return "udata8";
595  case dwarf::DW_EH_PE_sdata4:
596    return "sdata4";
597  case dwarf::DW_EH_PE_sdata8:
598    return "sdata8";
599  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4:
600    return "pcrel udata4";
601  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4:
602    return "pcrel sdata4";
603  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8:
604    return "pcrel udata8";
605  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8:
606    return "pcrel sdata8";
607  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata4:
608    return "indirect pcrel udata4";
609  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata4:
610    return "indirect pcrel sdata4";
611  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata8:
612    return "indirect pcrel udata8";
613  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata8:
614    return "indirect pcrel sdata8";
615  }
616
617  return 0;
618}
619
620void AsmPrinter::EOL(const char *Comment, unsigned Encoding) const {
621  if (VerboseAsm && *Comment) {
622    O.PadToColumn(MAI->getCommentColumn());
623    O << MAI->getCommentString()
624      << ' '
625      << Comment;
626
627    if (const char *EncStr = DecodeDWARFEncoding(Encoding))
628      O << " (" << EncStr << ')';
629  }
630  O << '\n';
631}
632
633/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
634/// unsigned leb128 value.
635void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
636  if (MAI->hasLEB128()) {
637    O << "\t.uleb128\t"
638      << Value;
639  } else {
640    O << MAI->getData8bitsDirective();
641    PrintULEB128(Value);
642  }
643}
644
645/// EmitSLEB128Bytes - print an assembler byte data directive to compose a
646/// signed leb128 value.
647void AsmPrinter::EmitSLEB128Bytes(int Value) const {
648  if (MAI->hasLEB128()) {
649    O << "\t.sleb128\t"
650      << Value;
651  } else {
652    O << MAI->getData8bitsDirective();
653    PrintSLEB128(Value);
654  }
655}
656
657/// EmitInt8 - Emit a byte directive and value.
658///
659void AsmPrinter::EmitInt8(int Value) const {
660  O << MAI->getData8bitsDirective();
661  PrintHex(Value & 0xFF);
662}
663
664/// EmitInt16 - Emit a short directive and value.
665///
666void AsmPrinter::EmitInt16(int Value) const {
667  O << MAI->getData16bitsDirective();
668  PrintHex(Value & 0xFFFF);
669}
670
671/// EmitInt32 - Emit a long directive and value.
672///
673void AsmPrinter::EmitInt32(int Value) const {
674  O << MAI->getData32bitsDirective();
675  PrintHex(Value);
676}
677
678/// EmitInt64 - Emit a long long directive and value.
679///
680void AsmPrinter::EmitInt64(uint64_t Value) const {
681  if (MAI->getData64bitsDirective()) {
682    O << MAI->getData64bitsDirective();
683    PrintHex(Value);
684  } else {
685    if (TM.getTargetData()->isBigEndian()) {
686      EmitInt32(unsigned(Value >> 32)); O << '\n';
687      EmitInt32(unsigned(Value));
688    } else {
689      EmitInt32(unsigned(Value)); O << '\n';
690      EmitInt32(unsigned(Value >> 32));
691    }
692  }
693}
694
695/// toOctal - Convert the low order bits of X into an octal digit.
696///
697static inline char toOctal(int X) {
698  return (X&7)+'0';
699}
700
701/// printStringChar - Print a char, escaped if necessary.
702///
703static void printStringChar(formatted_raw_ostream &O, unsigned char C) {
704  if (C == '"') {
705    O << "\\\"";
706  } else if (C == '\\') {
707    O << "\\\\";
708  } else if (isprint((unsigned char)C)) {
709    O << C;
710  } else {
711    switch(C) {
712    case '\b': O << "\\b"; break;
713    case '\f': O << "\\f"; break;
714    case '\n': O << "\\n"; break;
715    case '\r': O << "\\r"; break;
716    case '\t': O << "\\t"; break;
717    default:
718      O << '\\';
719      O << toOctal(C >> 6);
720      O << toOctal(C >> 3);
721      O << toOctal(C >> 0);
722      break;
723    }
724  }
725}
726
727/// EmitString - Emit a string with quotes and a null terminator.
728/// Special characters are emitted properly.
729/// \literal (Eg. '\t') \endliteral
730void AsmPrinter::EmitString(const std::string &String) const {
731  EmitString(String.c_str(), String.size());
732}
733
734void AsmPrinter::EmitString(const char *String, unsigned Size) const {
735  const char* AscizDirective = MAI->getAscizDirective();
736  if (AscizDirective)
737    O << AscizDirective;
738  else
739    O << MAI->getAsciiDirective();
740  O << '\"';
741  for (unsigned i = 0; i < Size; ++i)
742    printStringChar(O, String[i]);
743  if (AscizDirective)
744    O << '\"';
745  else
746    O << "\\0\"";
747}
748
749
750/// EmitFile - Emit a .file directive.
751void AsmPrinter::EmitFile(unsigned Number, const std::string &Name) const {
752  O << "\t.file\t" << Number << " \"";
753  for (unsigned i = 0, N = Name.size(); i < N; ++i)
754    printStringChar(O, Name[i]);
755  O << '\"';
756}
757
758
759//===----------------------------------------------------------------------===//
760
761// EmitAlignment - Emit an alignment directive to the specified power of
762// two boundary.  For example, if you pass in 3 here, you will get an 8
763// byte alignment.  If a global value is specified, and if that global has
764// an explicit alignment requested, it will unconditionally override the
765// alignment request.  However, if ForcedAlignBits is specified, this value
766// has final say: the ultimate alignment will be the max of ForcedAlignBits
767// and the alignment computed with NumBits and the global.
768//
769// The algorithm is:
770//     Align = NumBits;
771//     if (GV && GV->hasalignment) Align = GV->getalignment();
772//     Align = std::max(Align, ForcedAlignBits);
773//
774void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
775                               unsigned ForcedAlignBits,
776                               bool UseFillExpr) const {
777  if (GV && GV->getAlignment())
778    NumBits = Log2_32(GV->getAlignment());
779  NumBits = std::max(NumBits, ForcedAlignBits);
780
781  if (NumBits == 0) return;   // No need to emit alignment.
782
783  unsigned FillValue = 0;
784  if (getCurrentSection()->getKind().isText())
785    FillValue = MAI->getTextAlignFillValue();
786
787  OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0);
788}
789
790/// EmitZeros - Emit a block of zeros.
791///
792void AsmPrinter::EmitZeros(uint64_t NumZeros, unsigned AddrSpace) const {
793  if (NumZeros) {
794    if (MAI->getZeroDirective()) {
795      O << MAI->getZeroDirective() << NumZeros;
796      if (MAI->getZeroDirectiveSuffix())
797        O << MAI->getZeroDirectiveSuffix();
798      O << '\n';
799    } else {
800      for (; NumZeros; --NumZeros)
801        O << MAI->getData8bitsDirective(AddrSpace) << "0\n";
802    }
803  }
804}
805
806// Print out the specified constant, without a storage class.  Only the
807// constants valid in constant expressions can occur here.
808void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
809  if (CV->isNullValue() || isa<UndefValue>(CV))
810    O << '0';
811  else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
812    O << CI->getZExtValue();
813  } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
814    // This is a constant address for a global variable or function. Use the
815    // name of the variable or function as the address value.
816    O << Mang->getMangledName(GV);
817  } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
818    const TargetData *TD = TM.getTargetData();
819    unsigned Opcode = CE->getOpcode();
820    switch (Opcode) {
821    case Instruction::Trunc:
822    case Instruction::ZExt:
823    case Instruction::SExt:
824    case Instruction::FPTrunc:
825    case Instruction::FPExt:
826    case Instruction::UIToFP:
827    case Instruction::SIToFP:
828    case Instruction::FPToUI:
829    case Instruction::FPToSI:
830      llvm_unreachable("FIXME: Don't support this constant cast expr");
831    case Instruction::GetElementPtr: {
832      // generate a symbolic expression for the byte address
833      const Constant *ptrVal = CE->getOperand(0);
834      SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
835      if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
836                                                idxVec.size())) {
837        // Truncate/sext the offset to the pointer size.
838        if (TD->getPointerSizeInBits() != 64) {
839          int SExtAmount = 64-TD->getPointerSizeInBits();
840          Offset = (Offset << SExtAmount) >> SExtAmount;
841        }
842
843        if (Offset)
844          O << '(';
845        EmitConstantValueOnly(ptrVal);
846        if (Offset > 0)
847          O << ") + " << Offset;
848        else if (Offset < 0)
849          O << ") - " << -Offset;
850      } else {
851        EmitConstantValueOnly(ptrVal);
852      }
853      break;
854    }
855    case Instruction::BitCast:
856      return EmitConstantValueOnly(CE->getOperand(0));
857
858    case Instruction::IntToPtr: {
859      // Handle casts to pointers by changing them into casts to the appropriate
860      // integer type.  This promotes constant folding and simplifies this code.
861      Constant *Op = CE->getOperand(0);
862      Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(CV->getContext()),
863                                        false/*ZExt*/);
864      return EmitConstantValueOnly(Op);
865    }
866
867
868    case Instruction::PtrToInt: {
869      // Support only foldable casts to/from pointers that can be eliminated by
870      // changing the pointer to the appropriately sized integer type.
871      Constant *Op = CE->getOperand(0);
872      const Type *Ty = CE->getType();
873
874      // We can emit the pointer value into this slot if the slot is an
875      // integer slot greater or equal to the size of the pointer.
876      if (TD->getTypeAllocSize(Ty) == TD->getTypeAllocSize(Op->getType()))
877        return EmitConstantValueOnly(Op);
878
879      O << "((";
880      EmitConstantValueOnly(Op);
881      APInt ptrMask =
882        APInt::getAllOnesValue(TD->getTypeAllocSizeInBits(Op->getType()));
883
884      SmallString<40> S;
885      ptrMask.toStringUnsigned(S);
886      O << ") & " << S.str() << ')';
887      break;
888    }
889    case Instruction::Add:
890    case Instruction::Sub:
891    case Instruction::And:
892    case Instruction::Or:
893    case Instruction::Xor:
894      O << '(';
895      EmitConstantValueOnly(CE->getOperand(0));
896      O << ')';
897      switch (Opcode) {
898      case Instruction::Add:
899       O << " + ";
900       break;
901      case Instruction::Sub:
902       O << " - ";
903       break;
904      case Instruction::And:
905       O << " & ";
906       break;
907      case Instruction::Or:
908       O << " | ";
909       break;
910      case Instruction::Xor:
911       O << " ^ ";
912       break;
913      default:
914       break;
915      }
916      O << '(';
917      EmitConstantValueOnly(CE->getOperand(1));
918      O << ')';
919      break;
920    default:
921      llvm_unreachable("Unsupported operator!");
922    }
923  } else {
924    llvm_unreachable("Unknown constant value!");
925  }
926}
927
928/// printAsCString - Print the specified array as a C compatible string, only if
929/// the predicate isString is true.
930///
931static void printAsCString(formatted_raw_ostream &O, const ConstantArray *CVA,
932                           unsigned LastElt) {
933  assert(CVA->isString() && "Array is not string compatible!");
934
935  O << '\"';
936  for (unsigned i = 0; i != LastElt; ++i) {
937    unsigned char C =
938        (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
939    printStringChar(O, C);
940  }
941  O << '\"';
942}
943
944/// EmitString - Emit a zero-byte-terminated string constant.
945///
946void AsmPrinter::EmitString(const ConstantArray *CVA) const {
947  unsigned NumElts = CVA->getNumOperands();
948  if (MAI->getAscizDirective() && NumElts &&
949      cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
950    O << MAI->getAscizDirective();
951    printAsCString(O, CVA, NumElts-1);
952  } else {
953    O << MAI->getAsciiDirective();
954    printAsCString(O, CVA, NumElts);
955  }
956  O << '\n';
957}
958
959void AsmPrinter::EmitGlobalConstantArray(const ConstantArray *CVA,
960                                         unsigned AddrSpace) {
961  if (CVA->isString()) {
962    EmitString(CVA);
963  } else { // Not a string.  Print the values in successive locations
964    for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
965      EmitGlobalConstant(CVA->getOperand(i), AddrSpace);
966  }
967}
968
969void AsmPrinter::EmitGlobalConstantVector(const ConstantVector *CP) {
970  const VectorType *PTy = CP->getType();
971
972  for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
973    EmitGlobalConstant(CP->getOperand(I));
974}
975
976void AsmPrinter::EmitGlobalConstantStruct(const ConstantStruct *CVS,
977                                          unsigned AddrSpace) {
978  // Print the fields in successive locations. Pad to align if needed!
979  const TargetData *TD = TM.getTargetData();
980  unsigned Size = TD->getTypeAllocSize(CVS->getType());
981  const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
982  uint64_t sizeSoFar = 0;
983  for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
984    const Constant* field = CVS->getOperand(i);
985
986    // Check if padding is needed and insert one or more 0s.
987    uint64_t fieldSize = TD->getTypeAllocSize(field->getType());
988    uint64_t padSize = ((i == e-1 ? Size : cvsLayout->getElementOffset(i+1))
989                        - cvsLayout->getElementOffset(i)) - fieldSize;
990    sizeSoFar += fieldSize + padSize;
991
992    // Now print the actual field value.
993    EmitGlobalConstant(field, AddrSpace);
994
995    // Insert padding - this may include padding to increase the size of the
996    // current field up to the ABI size (if the struct is not packed) as well
997    // as padding to ensure that the next field starts at the right offset.
998    EmitZeros(padSize, AddrSpace);
999  }
1000  assert(sizeSoFar == cvsLayout->getSizeInBytes() &&
1001         "Layout of constant struct may be incorrect!");
1002}
1003
1004void AsmPrinter::EmitGlobalConstantFP(const ConstantFP *CFP,
1005                                      unsigned AddrSpace) {
1006  // FP Constants are printed as integer constants to avoid losing
1007  // precision...
1008  LLVMContext &Context = CFP->getContext();
1009  const TargetData *TD = TM.getTargetData();
1010  if (CFP->getType() == Type::getDoubleTy(Context)) {
1011    double Val = CFP->getValueAPF().convertToDouble();  // for comment only
1012    uint64_t i = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1013    if (MAI->getData64bitsDirective(AddrSpace)) {
1014      O << MAI->getData64bitsDirective(AddrSpace) << i;
1015      if (VerboseAsm) {
1016        O.PadToColumn(MAI->getCommentColumn());
1017        O << MAI->getCommentString() << " double " << Val;
1018      }
1019      O << '\n';
1020    } else if (TD->isBigEndian()) {
1021      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1022      if (VerboseAsm) {
1023        O.PadToColumn(MAI->getCommentColumn());
1024        O << MAI->getCommentString()
1025          << " most significant word of double " << Val;
1026      }
1027      O << '\n';
1028      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1029      if (VerboseAsm) {
1030        O.PadToColumn(MAI->getCommentColumn());
1031        O << MAI->getCommentString()
1032          << " least significant word of double " << Val;
1033      }
1034      O << '\n';
1035    } else {
1036      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1037      if (VerboseAsm) {
1038        O.PadToColumn(MAI->getCommentColumn());
1039        O << MAI->getCommentString()
1040          << " least significant word of double " << Val;
1041      }
1042      O << '\n';
1043      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1044      if (VerboseAsm) {
1045        O.PadToColumn(MAI->getCommentColumn());
1046        O << MAI->getCommentString()
1047          << " most significant word of double " << Val;
1048      }
1049      O << '\n';
1050    }
1051    return;
1052  } else if (CFP->getType() == Type::getFloatTy(Context)) {
1053    float Val = CFP->getValueAPF().convertToFloat();  // for comment only
1054    O << MAI->getData32bitsDirective(AddrSpace)
1055      << CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1056    if (VerboseAsm) {
1057      O.PadToColumn(MAI->getCommentColumn());
1058      O << MAI->getCommentString() << " float " << Val;
1059    }
1060    O << '\n';
1061    return;
1062  } else if (CFP->getType() == Type::getX86_FP80Ty(Context)) {
1063    // all long double variants are printed as hex
1064    // api needed to prevent premature destruction
1065    APInt api = CFP->getValueAPF().bitcastToAPInt();
1066    const uint64_t *p = api.getRawData();
1067    // Convert to double so we can print the approximate val as a comment.
1068    APFloat DoubleVal = CFP->getValueAPF();
1069    bool ignored;
1070    DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1071                      &ignored);
1072    if (TD->isBigEndian()) {
1073      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1074      if (VerboseAsm) {
1075        O.PadToColumn(MAI->getCommentColumn());
1076        O << MAI->getCommentString()
1077          << " most significant halfword of x86_fp80 ~"
1078          << DoubleVal.convertToDouble();
1079      }
1080      O << '\n';
1081      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1082      if (VerboseAsm) {
1083        O.PadToColumn(MAI->getCommentColumn());
1084        O << MAI->getCommentString() << " next halfword";
1085      }
1086      O << '\n';
1087      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1088      if (VerboseAsm) {
1089        O.PadToColumn(MAI->getCommentColumn());
1090        O << MAI->getCommentString() << " next halfword";
1091      }
1092      O << '\n';
1093      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1094      if (VerboseAsm) {
1095        O.PadToColumn(MAI->getCommentColumn());
1096        O << MAI->getCommentString() << " next halfword";
1097      }
1098      O << '\n';
1099      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1100      if (VerboseAsm) {
1101        O.PadToColumn(MAI->getCommentColumn());
1102        O << MAI->getCommentString()
1103          << " least significant halfword";
1104      }
1105      O << '\n';
1106     } else {
1107      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1108      if (VerboseAsm) {
1109        O.PadToColumn(MAI->getCommentColumn());
1110        O << MAI->getCommentString()
1111          << " least significant halfword of x86_fp80 ~"
1112          << DoubleVal.convertToDouble();
1113      }
1114      O << '\n';
1115      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1116      if (VerboseAsm) {
1117        O.PadToColumn(MAI->getCommentColumn());
1118        O << MAI->getCommentString()
1119          << " next halfword";
1120      }
1121      O << '\n';
1122      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1123      if (VerboseAsm) {
1124        O.PadToColumn(MAI->getCommentColumn());
1125        O << MAI->getCommentString()
1126          << " next halfword";
1127      }
1128      O << '\n';
1129      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1130      if (VerboseAsm) {
1131        O.PadToColumn(MAI->getCommentColumn());
1132        O << MAI->getCommentString()
1133          << " next halfword";
1134      }
1135      O << '\n';
1136      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1137      if (VerboseAsm) {
1138        O.PadToColumn(MAI->getCommentColumn());
1139        O << MAI->getCommentString()
1140          << " most significant halfword";
1141      }
1142      O << '\n';
1143    }
1144    EmitZeros(TD->getTypeAllocSize(Type::getX86_FP80Ty(Context)) -
1145              TD->getTypeStoreSize(Type::getX86_FP80Ty(Context)), AddrSpace);
1146    return;
1147  } else if (CFP->getType() == Type::getPPC_FP128Ty(Context)) {
1148    // all long double variants are printed as hex
1149    // api needed to prevent premature destruction
1150    APInt api = CFP->getValueAPF().bitcastToAPInt();
1151    const uint64_t *p = api.getRawData();
1152    if (TD->isBigEndian()) {
1153      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1154      if (VerboseAsm) {
1155        O.PadToColumn(MAI->getCommentColumn());
1156        O << MAI->getCommentString()
1157          << " most significant word of ppc_fp128";
1158      }
1159      O << '\n';
1160      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1161      if (VerboseAsm) {
1162        O.PadToColumn(MAI->getCommentColumn());
1163        O << MAI->getCommentString()
1164        << " next word";
1165      }
1166      O << '\n';
1167      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1168      if (VerboseAsm) {
1169        O.PadToColumn(MAI->getCommentColumn());
1170        O << MAI->getCommentString()
1171          << " next word";
1172      }
1173      O << '\n';
1174      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
1175      if (VerboseAsm) {
1176        O.PadToColumn(MAI->getCommentColumn());
1177        O << MAI->getCommentString()
1178          << " least significant word";
1179      }
1180      O << '\n';
1181     } else {
1182      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
1183      if (VerboseAsm) {
1184        O.PadToColumn(MAI->getCommentColumn());
1185        O << MAI->getCommentString()
1186          << " least significant word of ppc_fp128";
1187      }
1188      O << '\n';
1189      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1190      if (VerboseAsm) {
1191        O.PadToColumn(MAI->getCommentColumn());
1192        O << MAI->getCommentString()
1193          << " next word";
1194      }
1195      O << '\n';
1196      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1197      if (VerboseAsm) {
1198        O.PadToColumn(MAI->getCommentColumn());
1199        O << MAI->getCommentString()
1200          << " next word";
1201      }
1202      O << '\n';
1203      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1204      if (VerboseAsm) {
1205        O.PadToColumn(MAI->getCommentColumn());
1206        O << MAI->getCommentString()
1207          << " most significant word";
1208      }
1209      O << '\n';
1210    }
1211    return;
1212  } else llvm_unreachable("Floating point constant type not handled");
1213}
1214
1215void AsmPrinter::EmitGlobalConstantLargeInt(const ConstantInt *CI,
1216                                            unsigned AddrSpace) {
1217  const TargetData *TD = TM.getTargetData();
1218  unsigned BitWidth = CI->getBitWidth();
1219  assert(isPowerOf2_32(BitWidth) &&
1220         "Non-power-of-2-sized integers not handled!");
1221
1222  // We don't expect assemblers to support integer data directives
1223  // for more than 64 bits, so we emit the data in at most 64-bit
1224  // quantities at a time.
1225  const uint64_t *RawData = CI->getValue().getRawData();
1226  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1227    uint64_t Val;
1228    if (TD->isBigEndian())
1229      Val = RawData[e - i - 1];
1230    else
1231      Val = RawData[i];
1232
1233    if (MAI->getData64bitsDirective(AddrSpace))
1234      O << MAI->getData64bitsDirective(AddrSpace) << Val << '\n';
1235    else if (TD->isBigEndian()) {
1236      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32);
1237      if (VerboseAsm) {
1238        O.PadToColumn(MAI->getCommentColumn());
1239        O << MAI->getCommentString()
1240          << " most significant half of i64 " << Val;
1241      }
1242      O << '\n';
1243      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(Val);
1244      if (VerboseAsm) {
1245        O.PadToColumn(MAI->getCommentColumn());
1246        O << MAI->getCommentString()
1247          << " least significant half of i64 " << Val;
1248      }
1249      O << '\n';
1250    } else {
1251      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(Val);
1252      if (VerboseAsm) {
1253        O.PadToColumn(MAI->getCommentColumn());
1254        O << MAI->getCommentString()
1255          << " least significant half of i64 " << Val;
1256      }
1257      O << '\n';
1258      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32);
1259      if (VerboseAsm) {
1260        O.PadToColumn(MAI->getCommentColumn());
1261        O << MAI->getCommentString()
1262          << " most significant half of i64 " << Val;
1263      }
1264      O << '\n';
1265    }
1266  }
1267}
1268
1269/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1270void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1271  const TargetData *TD = TM.getTargetData();
1272  const Type *type = CV->getType();
1273  unsigned Size = TD->getTypeAllocSize(type);
1274
1275  if (CV->isNullValue() || isa<UndefValue>(CV)) {
1276    EmitZeros(Size, AddrSpace);
1277    return;
1278  } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
1279    EmitGlobalConstantArray(CVA , AddrSpace);
1280    return;
1281  } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
1282    EmitGlobalConstantStruct(CVS, AddrSpace);
1283    return;
1284  } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
1285    EmitGlobalConstantFP(CFP, AddrSpace);
1286    return;
1287  } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1288    // Small integers are handled below; large integers are handled here.
1289    if (Size > 4) {
1290      EmitGlobalConstantLargeInt(CI, AddrSpace);
1291      return;
1292    }
1293  } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) {
1294    EmitGlobalConstantVector(CP);
1295    return;
1296  }
1297
1298  printDataDirective(type, AddrSpace);
1299  EmitConstantValueOnly(CV);
1300  if (VerboseAsm) {
1301    if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1302      SmallString<40> S;
1303      CI->getValue().toStringUnsigned(S, 16);
1304      O.PadToColumn(MAI->getCommentColumn());
1305      O << MAI->getCommentString() << " 0x" << S.str();
1306    }
1307  }
1308  O << '\n';
1309}
1310
1311void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1312  // Target doesn't support this yet!
1313  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1314}
1315
1316/// PrintSpecial - Print information related to the specified machine instr
1317/// that is independent of the operand, and may be independent of the instr
1318/// itself.  This can be useful for portably encoding the comment character
1319/// or other bits of target-specific knowledge into the asmstrings.  The
1320/// syntax used is ${:comment}.  Targets can override this to add support
1321/// for their own strange codes.
1322void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1323  if (!strcmp(Code, "private")) {
1324    O << MAI->getPrivateGlobalPrefix();
1325  } else if (!strcmp(Code, "comment")) {
1326    if (VerboseAsm)
1327      O << MAI->getCommentString();
1328  } else if (!strcmp(Code, "uid")) {
1329    // Comparing the address of MI isn't sufficient, because machineinstrs may
1330    // be allocated to the same address across functions.
1331    const Function *ThisF = MI->getParent()->getParent()->getFunction();
1332
1333    // If this is a new LastFn instruction, bump the counter.
1334    if (LastMI != MI || LastFn != ThisF) {
1335      ++Counter;
1336      LastMI = MI;
1337      LastFn = ThisF;
1338    }
1339    O << Counter;
1340  } else {
1341    std::string msg;
1342    raw_string_ostream Msg(msg);
1343    Msg << "Unknown special formatter '" << Code
1344         << "' for machine instr: " << *MI;
1345    llvm_report_error(Msg.str());
1346  }
1347}
1348
1349/// processDebugLoc - Processes the debug information of each machine
1350/// instruction's DebugLoc.
1351void AsmPrinter::processDebugLoc(DebugLoc DL) {
1352  if (!MAI || !DW)
1353    return;
1354
1355  if (MAI->doesSupportDebugInformation() && DW->ShouldEmitDwarfDebug()) {
1356    if (!DL.isUnknown()) {
1357      DebugLocTuple CurDLT = MF->getDebugLocTuple(DL);
1358
1359      if (CurDLT.CompileUnit != 0 && PrevDLT != CurDLT) {
1360        printLabel(DW->RecordSourceLine(CurDLT.Line, CurDLT.Col,
1361                                        DICompileUnit(CurDLT.CompileUnit)));
1362        O << '\n';
1363      }
1364
1365      PrevDLT = CurDLT;
1366    }
1367  }
1368}
1369
1370/// printInlineAsm - This method formats and prints the specified machine
1371/// instruction that is an inline asm.
1372void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1373  unsigned NumOperands = MI->getNumOperands();
1374
1375  // Count the number of register definitions.
1376  unsigned NumDefs = 0;
1377  for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1378       ++NumDefs)
1379    assert(NumDefs != NumOperands-1 && "No asm string?");
1380
1381  assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1382
1383  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1384  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1385
1386  // If this asmstr is empty, just print the #APP/#NOAPP markers.
1387  // These are useful to see where empty asm's wound up.
1388  if (AsmStr[0] == 0) {
1389    O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1390    O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
1391    return;
1392  }
1393
1394  O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1395
1396  // The variant of the current asmprinter.
1397  int AsmPrinterVariant = MAI->getAssemblerDialect();
1398
1399  int CurVariant = -1;            // The number of the {.|.|.} region we are in.
1400  const char *LastEmitted = AsmStr; // One past the last character emitted.
1401
1402  while (*LastEmitted) {
1403    switch (*LastEmitted) {
1404    default: {
1405      // Not a special case, emit the string section literally.
1406      const char *LiteralEnd = LastEmitted+1;
1407      while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1408             *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1409        ++LiteralEnd;
1410      if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1411        O.write(LastEmitted, LiteralEnd-LastEmitted);
1412      LastEmitted = LiteralEnd;
1413      break;
1414    }
1415    case '\n':
1416      ++LastEmitted;   // Consume newline character.
1417      O << '\n';       // Indent code with newline.
1418      break;
1419    case '$': {
1420      ++LastEmitted;   // Consume '$' character.
1421      bool Done = true;
1422
1423      // Handle escapes.
1424      switch (*LastEmitted) {
1425      default: Done = false; break;
1426      case '$':     // $$ -> $
1427        if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1428          O << '$';
1429        ++LastEmitted;  // Consume second '$' character.
1430        break;
1431      case '(':             // $( -> same as GCC's { character.
1432        ++LastEmitted;      // Consume '(' character.
1433        if (CurVariant != -1) {
1434          llvm_report_error("Nested variants found in inline asm string: '"
1435                            + std::string(AsmStr) + "'");
1436        }
1437        CurVariant = 0;     // We're in the first variant now.
1438        break;
1439      case '|':
1440        ++LastEmitted;  // consume '|' character.
1441        if (CurVariant == -1)
1442          O << '|';       // this is gcc's behavior for | outside a variant
1443        else
1444          ++CurVariant;   // We're in the next variant.
1445        break;
1446      case ')':         // $) -> same as GCC's } char.
1447        ++LastEmitted;  // consume ')' character.
1448        if (CurVariant == -1)
1449          O << '}';     // this is gcc's behavior for } outside a variant
1450        else
1451          CurVariant = -1;
1452        break;
1453      }
1454      if (Done) break;
1455
1456      bool HasCurlyBraces = false;
1457      if (*LastEmitted == '{') {     // ${variable}
1458        ++LastEmitted;               // Consume '{' character.
1459        HasCurlyBraces = true;
1460      }
1461
1462      // If we have ${:foo}, then this is not a real operand reference, it is a
1463      // "magic" string reference, just like in .td files.  Arrange to call
1464      // PrintSpecial.
1465      if (HasCurlyBraces && *LastEmitted == ':') {
1466        ++LastEmitted;
1467        const char *StrStart = LastEmitted;
1468        const char *StrEnd = strchr(StrStart, '}');
1469        if (StrEnd == 0) {
1470          llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1471                            + std::string(AsmStr) + "'");
1472        }
1473
1474        std::string Val(StrStart, StrEnd);
1475        PrintSpecial(MI, Val.c_str());
1476        LastEmitted = StrEnd+1;
1477        break;
1478      }
1479
1480      const char *IDStart = LastEmitted;
1481      char *IDEnd;
1482      errno = 0;
1483      long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1484      if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1485        llvm_report_error("Bad $ operand number in inline asm string: '"
1486                          + std::string(AsmStr) + "'");
1487      }
1488      LastEmitted = IDEnd;
1489
1490      char Modifier[2] = { 0, 0 };
1491
1492      if (HasCurlyBraces) {
1493        // If we have curly braces, check for a modifier character.  This
1494        // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1495        if (*LastEmitted == ':') {
1496          ++LastEmitted;    // Consume ':' character.
1497          if (*LastEmitted == 0) {
1498            llvm_report_error("Bad ${:} expression in inline asm string: '"
1499                              + std::string(AsmStr) + "'");
1500          }
1501
1502          Modifier[0] = *LastEmitted;
1503          ++LastEmitted;    // Consume modifier character.
1504        }
1505
1506        if (*LastEmitted != '}') {
1507          llvm_report_error("Bad ${} expression in inline asm string: '"
1508                            + std::string(AsmStr) + "'");
1509        }
1510        ++LastEmitted;    // Consume '}' character.
1511      }
1512
1513      if ((unsigned)Val >= NumOperands-1) {
1514        llvm_report_error("Invalid $ operand number in inline asm string: '"
1515                          + std::string(AsmStr) + "'");
1516      }
1517
1518      // Okay, we finally have a value number.  Ask the target to print this
1519      // operand!
1520      if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1521        unsigned OpNo = 1;
1522
1523        bool Error = false;
1524
1525        // Scan to find the machine operand number for the operand.
1526        for (; Val; --Val) {
1527          if (OpNo >= MI->getNumOperands()) break;
1528          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1529          OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1530        }
1531
1532        if (OpNo >= MI->getNumOperands()) {
1533          Error = true;
1534        } else {
1535          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1536          ++OpNo;  // Skip over the ID number.
1537
1538          if (Modifier[0]=='l')  // labels are target independent
1539            GetMBBSymbol(MI->getOperand(OpNo).getMBB()
1540                           ->getNumber())->print(O, MAI);
1541          else {
1542            AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1543            if ((OpFlags & 7) == 4) {
1544              Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1545                                                Modifier[0] ? Modifier : 0);
1546            } else {
1547              Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1548                                          Modifier[0] ? Modifier : 0);
1549            }
1550          }
1551        }
1552        if (Error) {
1553          std::string msg;
1554          raw_string_ostream Msg(msg);
1555          Msg << "Invalid operand found in inline asm: '"
1556               << AsmStr << "'\n";
1557          MI->print(Msg);
1558          llvm_report_error(Msg.str());
1559        }
1560      }
1561      break;
1562    }
1563    }
1564  }
1565  O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd();
1566}
1567
1568/// printImplicitDef - This method prints the specified machine instruction
1569/// that is an implicit def.
1570void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1571  if (!VerboseAsm) return;
1572  O.PadToColumn(MAI->getCommentColumn());
1573  O << MAI->getCommentString() << " implicit-def: "
1574    << TRI->getName(MI->getOperand(0).getReg());
1575}
1576
1577/// printLabel - This method prints a local label used by debug and
1578/// exception handling tables.
1579void AsmPrinter::printLabel(const MachineInstr *MI) const {
1580  printLabel(MI->getOperand(0).getImm());
1581}
1582
1583void AsmPrinter::printLabel(unsigned Id) const {
1584  O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':';
1585}
1586
1587/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1588/// instruction, using the specified assembler variant.  Targets should
1589/// overried this to format as appropriate.
1590bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1591                                 unsigned AsmVariant, const char *ExtraCode) {
1592  // Target doesn't support this yet!
1593  return true;
1594}
1595
1596bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1597                                       unsigned AsmVariant,
1598                                       const char *ExtraCode) {
1599  // Target doesn't support this yet!
1600  return true;
1601}
1602
1603MCSymbol *AsmPrinter::GetMBBSymbol(unsigned MBBID) const {
1604  SmallString<60> Name;
1605  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "BB"
1606    << getFunctionNumber() << '_' << MBBID;
1607
1608  return OutContext.GetOrCreateSymbol(Name.str());
1609}
1610
1611
1612/// EmitBasicBlockStart - This method prints the label for the specified
1613/// MachineBasicBlock, an alignment (if present) and a comment describing
1614/// it if appropriate.
1615void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
1616  if (unsigned Align = MBB->getAlignment())
1617    EmitAlignment(Log2_32(Align));
1618
1619  GetMBBSymbol(MBB->getNumber())->print(O, MAI);
1620  O << ':';
1621
1622  if (VerboseAsm) {
1623    if (const BasicBlock *BB = MBB->getBasicBlock())
1624      if (BB->hasName()) {
1625        O.PadToColumn(MAI->getCommentColumn());
1626        O << MAI->getCommentString() << ' ';
1627        WriteAsOperand(O, BB, /*PrintType=*/false);
1628      }
1629
1630    EmitComments(*MBB);
1631  }
1632}
1633
1634/// printPICJumpTableSetLabel - This method prints a set label for the
1635/// specified MachineBasicBlock for a jumptable entry.
1636void AsmPrinter::printPICJumpTableSetLabel(unsigned uid,
1637                                           const MachineBasicBlock *MBB) const {
1638  if (!MAI->getSetDirective())
1639    return;
1640
1641  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1642    << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
1643  GetMBBSymbol(MBB->getNumber())->print(O, MAI);
1644  O << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1645    << '_' << uid << '\n';
1646}
1647
1648void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
1649                                           const MachineBasicBlock *MBB) const {
1650  if (!MAI->getSetDirective())
1651    return;
1652
1653  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1654    << getFunctionNumber() << '_' << uid << '_' << uid2
1655    << "_set_" << MBB->getNumber() << ',';
1656  GetMBBSymbol(MBB->getNumber())->print(O, MAI);
1657  O << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1658    << '_' << uid << '_' << uid2 << '\n';
1659}
1660
1661/// printDataDirective - This method prints the asm directive for the
1662/// specified type.
1663void AsmPrinter::printDataDirective(const Type *type, unsigned AddrSpace) {
1664  const TargetData *TD = TM.getTargetData();
1665  switch (type->getTypeID()) {
1666  case Type::FloatTyID: case Type::DoubleTyID:
1667  case Type::X86_FP80TyID: case Type::FP128TyID: case Type::PPC_FP128TyID:
1668    assert(0 && "Should have already output floating point constant.");
1669  default:
1670    assert(0 && "Can't handle printing this type of thing");
1671  case Type::IntegerTyID: {
1672    unsigned BitWidth = cast<IntegerType>(type)->getBitWidth();
1673    if (BitWidth <= 8)
1674      O << MAI->getData8bitsDirective(AddrSpace);
1675    else if (BitWidth <= 16)
1676      O << MAI->getData16bitsDirective(AddrSpace);
1677    else if (BitWidth <= 32)
1678      O << MAI->getData32bitsDirective(AddrSpace);
1679    else if (BitWidth <= 64) {
1680      assert(MAI->getData64bitsDirective(AddrSpace) &&
1681             "Target cannot handle 64-bit constant exprs!");
1682      O << MAI->getData64bitsDirective(AddrSpace);
1683    } else {
1684      llvm_unreachable("Target cannot handle given data directive width!");
1685    }
1686    break;
1687  }
1688  case Type::PointerTyID:
1689    if (TD->getPointerSize() == 8) {
1690      assert(MAI->getData64bitsDirective(AddrSpace) &&
1691             "Target cannot handle 64-bit pointer exprs!");
1692      O << MAI->getData64bitsDirective(AddrSpace);
1693    } else if (TD->getPointerSize() == 2) {
1694      O << MAI->getData16bitsDirective(AddrSpace);
1695    } else if (TD->getPointerSize() == 1) {
1696      O << MAI->getData8bitsDirective(AddrSpace);
1697    } else {
1698      O << MAI->getData32bitsDirective(AddrSpace);
1699    }
1700    break;
1701  }
1702}
1703
1704void AsmPrinter::printVisibility(const std::string& Name,
1705                                 unsigned Visibility) const {
1706  if (Visibility == GlobalValue::HiddenVisibility) {
1707    if (const char *Directive = MAI->getHiddenDirective())
1708      O << Directive << Name << '\n';
1709  } else if (Visibility == GlobalValue::ProtectedVisibility) {
1710    if (const char *Directive = MAI->getProtectedDirective())
1711      O << Directive << Name << '\n';
1712  }
1713}
1714
1715void AsmPrinter::printOffset(int64_t Offset) const {
1716  if (Offset > 0)
1717    O << '+' << Offset;
1718  else if (Offset < 0)
1719    O << Offset;
1720}
1721
1722GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1723  if (!S->usesMetadata())
1724    return 0;
1725
1726  gcp_iterator GCPI = GCMetadataPrinters.find(S);
1727  if (GCPI != GCMetadataPrinters.end())
1728    return GCPI->second;
1729
1730  const char *Name = S->getName().c_str();
1731
1732  for (GCMetadataPrinterRegistry::iterator
1733         I = GCMetadataPrinterRegistry::begin(),
1734         E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1735    if (strcmp(Name, I->getName()) == 0) {
1736      GCMetadataPrinter *GMP = I->instantiate();
1737      GMP->S = S;
1738      GCMetadataPrinters.insert(std::make_pair(S, GMP));
1739      return GMP;
1740    }
1741
1742  errs() << "no GCMetadataPrinter registered for GC: " << Name << "\n";
1743  llvm_unreachable(0);
1744}
1745
1746/// EmitComments - Pretty-print comments for instructions
1747void AsmPrinter::EmitComments(const MachineInstr &MI) const {
1748  assert(VerboseAsm && !MI.getDebugLoc().isUnknown());
1749
1750  DebugLocTuple DLT = MF->getDebugLocTuple(MI.getDebugLoc());
1751
1752  // Print source line info.
1753  O.PadToColumn(MAI->getCommentColumn());
1754  O << MAI->getCommentString() << " SrcLine ";
1755  if (DLT.CompileUnit) {
1756    std::string Str;
1757    DICompileUnit CU(DLT.CompileUnit);
1758    O << CU.getFilename(Str) << " ";
1759  }
1760  O << DLT.Line;
1761  if (DLT.Col != 0)
1762    O << ":" << DLT.Col;
1763}
1764
1765/// PrintChildLoopComment - Print comments about child loops within
1766/// the loop for this basic block, with nesting.
1767///
1768static void PrintChildLoopComment(formatted_raw_ostream &O,
1769                                  const MachineLoop *loop,
1770                                  const MCAsmInfo *MAI,
1771                                  int FunctionNumber) {
1772  // Add child loop information
1773  for(MachineLoop::iterator cl = loop->begin(),
1774        clend = loop->end();
1775      cl != clend;
1776      ++cl) {
1777    MachineBasicBlock *Header = (*cl)->getHeader();
1778    assert(Header && "No header for loop");
1779
1780    O << '\n';
1781    O.PadToColumn(MAI->getCommentColumn());
1782
1783    O << MAI->getCommentString();
1784    O.indent(((*cl)->getLoopDepth()-1)*2)
1785      << " Child Loop BB" << FunctionNumber << "_"
1786      << Header->getNumber() << " Depth " << (*cl)->getLoopDepth();
1787
1788    PrintChildLoopComment(O, *cl, MAI, FunctionNumber);
1789  }
1790}
1791
1792/// EmitComments - Pretty-print comments for basic blocks
1793void AsmPrinter::EmitComments(const MachineBasicBlock &MBB) const
1794{
1795  if (VerboseAsm) {
1796    // Add loop depth information
1797    const MachineLoop *loop = LI->getLoopFor(&MBB);
1798
1799    if (loop) {
1800      // Print a newline after bb# annotation.
1801      O << "\n";
1802      O.PadToColumn(MAI->getCommentColumn());
1803      O << MAI->getCommentString() << " Loop Depth " << loop->getLoopDepth()
1804        << '\n';
1805
1806      O.PadToColumn(MAI->getCommentColumn());
1807
1808      MachineBasicBlock *Header = loop->getHeader();
1809      assert(Header && "No header for loop");
1810
1811      if (Header == &MBB) {
1812        O << MAI->getCommentString() << " Loop Header";
1813        PrintChildLoopComment(O, loop, MAI, getFunctionNumber());
1814      }
1815      else {
1816        O << MAI->getCommentString() << " Loop Header is BB"
1817          << getFunctionNumber() << "_" << loop->getHeader()->getNumber();
1818      }
1819
1820      if (loop->empty()) {
1821        O << '\n';
1822        O.PadToColumn(MAI->getCommentColumn());
1823        O << MAI->getCommentString() << " Inner Loop";
1824      }
1825
1826      // Add parent loop information
1827      for (const MachineLoop *CurLoop = loop->getParentLoop();
1828           CurLoop;
1829           CurLoop = CurLoop->getParentLoop()) {
1830        MachineBasicBlock *Header = CurLoop->getHeader();
1831        assert(Header && "No header for loop");
1832
1833        O << '\n';
1834        O.PadToColumn(MAI->getCommentColumn());
1835        O << MAI->getCommentString();
1836        O.indent((CurLoop->getLoopDepth()-1)*2)
1837          << " Inside Loop BB" << getFunctionNumber() << "_"
1838          << Header->getNumber() << " Depth " << CurLoop->getLoopDepth();
1839      }
1840    }
1841  }
1842}
1843