AsmPrinter.cpp revision 500fba8363dccdd3dd29495831e5d689ddc50c49 
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  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
111  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
112
113  if (MAI->hasSingleParameterDotFile()) {
114    /* Very minimal debug info. It is ignored if we emit actual
115       debug info. If we don't, this at helps the user find where
116       a function came from. */
117    O << "\t.file\t\"" << M.getModuleIdentifier() << "\"\n";
118  }
119
120  for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
121    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
122      MP->beginAssembly(O, *this, *MAI);
123
124  if (!M.getModuleInlineAsm().empty())
125    O << MAI->getCommentString() << " Start of file scope inline assembly\n"
126      << M.getModuleInlineAsm()
127      << '\n' << MAI->getCommentString()
128      << " End of file scope inline assembly\n";
129
130  if (MAI->doesSupportDebugInformation() ||
131      MAI->doesSupportExceptionHandling()) {
132    MMI = getAnalysisIfAvailable<MachineModuleInfo>();
133    if (MMI)
134      MMI->AnalyzeModule(M);
135    DW = getAnalysisIfAvailable<DwarfWriter>();
136    if (DW)
137      DW->BeginModule(&M, MMI, O, this, MAI);
138  }
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  delete Mang; Mang = 0;
209  DW = 0; MMI = 0;
210
211  OutStreamer.Finish();
212  return false;
213}
214
215void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
216  // What's my mangled name?
217  CurrentFnName = Mang->getMangledName(MF.getFunction());
218  IncrementFunctionNumber();
219
220  if (VerboseAsm)
221    LI = &getAnalysis<MachineLoopInfo>();
222}
223
224namespace {
225  // SectionCPs - Keep track the alignment, constpool entries per Section.
226  struct SectionCPs {
227    const MCSection *S;
228    unsigned Alignment;
229    SmallVector<unsigned, 4> CPEs;
230    SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {};
231  };
232}
233
234/// EmitConstantPool - Print to the current output stream assembly
235/// representations of the constants in the constant pool MCP. This is
236/// used to print out constants which have been "spilled to memory" by
237/// the code generator.
238///
239void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
240  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
241  if (CP.empty()) return;
242
243  // Calculate sections for constant pool entries. We collect entries to go into
244  // the same section together to reduce amount of section switch statements.
245  SmallVector<SectionCPs, 4> CPSections;
246  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
247    const MachineConstantPoolEntry &CPE = CP[i];
248    unsigned Align = CPE.getAlignment();
249
250    SectionKind Kind;
251    switch (CPE.getRelocationInfo()) {
252    default: llvm_unreachable("Unknown section kind");
253    case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
254    case 1:
255      Kind = SectionKind::getReadOnlyWithRelLocal();
256      break;
257    case 0:
258    switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
259    case 4:  Kind = SectionKind::getMergeableConst4(); break;
260    case 8:  Kind = SectionKind::getMergeableConst8(); break;
261    case 16: Kind = SectionKind::getMergeableConst16();break;
262    default: Kind = SectionKind::getMergeableConst(); break;
263    }
264    }
265
266    const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
267
268    // The number of sections are small, just do a linear search from the
269    // last section to the first.
270    bool Found = false;
271    unsigned SecIdx = CPSections.size();
272    while (SecIdx != 0) {
273      if (CPSections[--SecIdx].S == S) {
274        Found = true;
275        break;
276      }
277    }
278    if (!Found) {
279      SecIdx = CPSections.size();
280      CPSections.push_back(SectionCPs(S, Align));
281    }
282
283    if (Align > CPSections[SecIdx].Alignment)
284      CPSections[SecIdx].Alignment = Align;
285    CPSections[SecIdx].CPEs.push_back(i);
286  }
287
288  // Now print stuff into the calculated sections.
289  for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
290    OutStreamer.SwitchSection(CPSections[i].S);
291    EmitAlignment(Log2_32(CPSections[i].Alignment));
292
293    unsigned Offset = 0;
294    for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
295      unsigned CPI = CPSections[i].CPEs[j];
296      MachineConstantPoolEntry CPE = CP[CPI];
297
298      // Emit inter-object padding for alignment.
299      unsigned AlignMask = CPE.getAlignment() - 1;
300      unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
301      EmitZeros(NewOffset - Offset);
302
303      const Type *Ty = CPE.getType();
304      Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
305
306      O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
307        << CPI << ':';
308      if (VerboseAsm) {
309        O.PadToColumn(MAI->getCommentColumn());
310        O << MAI->getCommentString() << " constant ";
311        WriteTypeSymbolic(O, CPE.getType(), MF->getFunction()->getParent());
312      }
313      O << '\n';
314      if (CPE.isMachineConstantPoolEntry())
315        EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
316      else
317        EmitGlobalConstant(CPE.Val.ConstVal);
318    }
319  }
320}
321
322/// EmitJumpTableInfo - Print assembly representations of the jump tables used
323/// by the current function to the current output stream.
324///
325void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
326                                   MachineFunction &MF) {
327  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
328  if (JT.empty()) return;
329
330  bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
331
332  // Pick the directive to use to print the jump table entries, and switch to
333  // the appropriate section.
334  TargetLowering *LoweringInfo = TM.getTargetLowering();
335
336  const Function *F = MF.getFunction();
337  bool JTInDiffSection = false;
338  if (F->isWeakForLinker() ||
339      (IsPic && !LoweringInfo->usesGlobalOffsetTable())) {
340    // In PIC mode, we need to emit the jump table to the same section as the
341    // function body itself, otherwise the label differences won't make sense.
342    // We should also do if the section name is NULL or function is declared in
343    // discardable section.
344    OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang,
345                                                                    TM));
346  } else {
347    // Otherwise, drop it in the readonly section.
348    const MCSection *ReadOnlySection =
349      getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
350    OutStreamer.SwitchSection(ReadOnlySection);
351    JTInDiffSection = true;
352  }
353
354  EmitAlignment(Log2_32(MJTI->getAlignment()));
355
356  for (unsigned i = 0, e = JT.size(); i != e; ++i) {
357    const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
358
359    // If this jump table was deleted, ignore it.
360    if (JTBBs.empty()) continue;
361
362    // For PIC codegen, if possible we want to use the SetDirective to reduce
363    // the number of relocations the assembler will generate for the jump table.
364    // Set directives are all printed before the jump table itself.
365    SmallPtrSet<MachineBasicBlock*, 16> EmittedSets;
366    if (MAI->getSetDirective() && IsPic)
367      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
368        if (EmittedSets.insert(JTBBs[ii]))
369          printPICJumpTableSetLabel(i, JTBBs[ii]);
370
371    // On some targets (e.g. Darwin) we want to emit two consequtive labels
372    // before each jump table.  The first label is never referenced, but tells
373    // the assembler and linker the extents of the jump table object.  The
374    // second label is actually referenced by the code.
375    if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0]) {
376      O << MAI->getLinkerPrivateGlobalPrefix()
377        << "JTI" << getFunctionNumber() << '_' << i << ":\n";
378    }
379
380    O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
381      << '_' << i << ":\n";
382
383    for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
384      printPICJumpTableEntry(MJTI, JTBBs[ii], i);
385      O << '\n';
386    }
387  }
388}
389
390void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
391                                        const MachineBasicBlock *MBB,
392                                        unsigned uid)  const {
393  bool isPIC = TM.getRelocationModel() == Reloc::PIC_;
394
395  // Use JumpTableDirective otherwise honor the entry size from the jump table
396  // info.
397  const char *JTEntryDirective = MAI->getJumpTableDirective(isPIC);
398  bool HadJTEntryDirective = JTEntryDirective != NULL;
399  if (!HadJTEntryDirective) {
400    JTEntryDirective = MJTI->getEntrySize() == 4 ?
401      MAI->getData32bitsDirective() : MAI->getData64bitsDirective();
402  }
403
404  O << JTEntryDirective << ' ';
405
406  // If we have emitted set directives for the jump table entries, print
407  // them rather than the entries themselves.  If we're emitting PIC, then
408  // emit the table entries as differences between two text section labels.
409  // If we're emitting non-PIC code, then emit the entries as direct
410  // references to the target basic blocks.
411  if (!isPIC) {
412    GetMBBSymbol(MBB->getNumber())->print(O, MAI);
413  } else if (MAI->getSetDirective()) {
414    O << MAI->getPrivateGlobalPrefix() << getFunctionNumber()
415      << '_' << uid << "_set_" << MBB->getNumber();
416  } else {
417    GetMBBSymbol(MBB->getNumber())->print(O, MAI);
418    // If the arch uses custom Jump Table directives, don't calc relative to
419    // JT
420    if (!HadJTEntryDirective)
421      O << '-' << MAI->getPrivateGlobalPrefix() << "JTI"
422        << getFunctionNumber() << '_' << uid;
423  }
424}
425
426
427/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
428/// special global used by LLVM.  If so, emit it and return true, otherwise
429/// do nothing and return false.
430bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
431  if (GV->getName() == "llvm.used") {
432    if (MAI->getUsedDirective() != 0)    // No need to emit this at all.
433      EmitLLVMUsedList(GV->getInitializer());
434    return true;
435  }
436
437  // Ignore debug and non-emitted data.  This handles llvm.compiler.used.
438  if (GV->getSection() == "llvm.metadata" ||
439      GV->hasAvailableExternallyLinkage())
440    return true;
441
442  if (!GV->hasAppendingLinkage()) return false;
443
444  assert(GV->hasInitializer() && "Not a special LLVM global!");
445
446  const TargetData *TD = TM.getTargetData();
447  unsigned Align = Log2_32(TD->getPointerPrefAlignment());
448  if (GV->getName() == "llvm.global_ctors") {
449    OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
450    EmitAlignment(Align, 0);
451    EmitXXStructorList(GV->getInitializer());
452    return true;
453  }
454
455  if (GV->getName() == "llvm.global_dtors") {
456    OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
457    EmitAlignment(Align, 0);
458    EmitXXStructorList(GV->getInitializer());
459    return true;
460  }
461
462  return false;
463}
464
465/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
466/// global in the specified llvm.used list for which emitUsedDirectiveFor
467/// is true, as being used with this directive.
468void AsmPrinter::EmitLLVMUsedList(Constant *List) {
469  const char *Directive = MAI->getUsedDirective();
470
471  // Should be an array of 'i8*'.
472  ConstantArray *InitList = dyn_cast<ConstantArray>(List);
473  if (InitList == 0) return;
474
475  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
476    const GlobalValue *GV =
477      dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
478    if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang)) {
479      O << Directive;
480      EmitConstantValueOnly(InitList->getOperand(i));
481      O << '\n';
482    }
483  }
484}
485
486/// EmitXXStructorList - Emit the ctor or dtor list.  This just prints out the
487/// function pointers, ignoring the init priority.
488void AsmPrinter::EmitXXStructorList(Constant *List) {
489  // Should be an array of '{ int, void ()* }' structs.  The first value is the
490  // init priority, which we ignore.
491  if (!isa<ConstantArray>(List)) return;
492  ConstantArray *InitList = cast<ConstantArray>(List);
493  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
494    if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
495      if (CS->getNumOperands() != 2) return;  // Not array of 2-element structs.
496
497      if (CS->getOperand(1)->isNullValue())
498        return;  // Found a null terminator, exit printing.
499      // Emit the function pointer.
500      EmitGlobalConstant(CS->getOperand(1));
501    }
502}
503
504
505//===----------------------------------------------------------------------===//
506/// LEB 128 number encoding.
507
508/// PrintULEB128 - Print a series of hexidecimal values (separated by commas)
509/// representing an unsigned leb128 value.
510void AsmPrinter::PrintULEB128(unsigned Value) const {
511  char Buffer[20];
512  do {
513    unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
514    Value >>= 7;
515    if (Value) Byte |= 0x80;
516    O << "0x" << utohex_buffer(Byte, Buffer+20);
517    if (Value) O << ", ";
518  } while (Value);
519}
520
521/// PrintSLEB128 - Print a series of hexidecimal values (separated by commas)
522/// representing a signed leb128 value.
523void AsmPrinter::PrintSLEB128(int Value) const {
524  int Sign = Value >> (8 * sizeof(Value) - 1);
525  bool IsMore;
526  char Buffer[20];
527
528  do {
529    unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
530    Value >>= 7;
531    IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
532    if (IsMore) Byte |= 0x80;
533    O << "0x" << utohex_buffer(Byte, Buffer+20);
534    if (IsMore) O << ", ";
535  } while (IsMore);
536}
537
538//===--------------------------------------------------------------------===//
539// Emission and print routines
540//
541
542/// PrintHex - Print a value as a hexidecimal value.
543///
544void AsmPrinter::PrintHex(int Value) const {
545  char Buffer[20];
546  O << "0x" << utohex_buffer(static_cast<unsigned>(Value), Buffer+20);
547}
548
549/// EOL - Print a newline character to asm stream.  If a comment is present
550/// then it will be printed first.  Comments should not contain '\n'.
551void AsmPrinter::EOL() const {
552  O << '\n';
553}
554
555void AsmPrinter::EOL(const std::string &Comment) const {
556  if (VerboseAsm && !Comment.empty()) {
557    O.PadToColumn(MAI->getCommentColumn());
558    O << MAI->getCommentString()
559      << ' '
560      << Comment;
561  }
562  O << '\n';
563}
564
565void AsmPrinter::EOL(const char* Comment) const {
566  if (VerboseAsm && *Comment) {
567    O.PadToColumn(MAI->getCommentColumn());
568    O << MAI->getCommentString()
569      << ' '
570      << Comment;
571  }
572  O << '\n';
573}
574
575static const char *DecodeDWARFEncoding(unsigned Encoding) {
576  switch (Encoding) {
577  case dwarf::DW_EH_PE_absptr:
578    return "absptr";
579  case dwarf::DW_EH_PE_omit:
580    return "omit";
581  case dwarf::DW_EH_PE_pcrel:
582    return "pcrel";
583  case dwarf::DW_EH_PE_udata4:
584    return "udata4";
585  case dwarf::DW_EH_PE_udata8:
586    return "udata8";
587  case dwarf::DW_EH_PE_sdata4:
588    return "sdata4";
589  case dwarf::DW_EH_PE_sdata8:
590    return "sdata8";
591  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4:
592    return "pcrel udata4";
593  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4:
594    return "pcrel sdata4";
595  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8:
596    return "pcrel udata8";
597  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8:
598    return "pcrel sdata8";
599  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata4:
600    return "indirect pcrel udata4";
601  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata4:
602    return "indirect pcrel sdata4";
603  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata8:
604    return "indirect pcrel udata8";
605  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata8:
606    return "indirect pcrel sdata8";
607  }
608
609  return 0;
610}
611
612void AsmPrinter::EOL(const char *Comment, unsigned Encoding) const {
613  if (VerboseAsm && *Comment) {
614    O.PadToColumn(MAI->getCommentColumn());
615    O << MAI->getCommentString()
616      << ' '
617      << Comment;
618
619    if (const char *EncStr = DecodeDWARFEncoding(Encoding))
620      O << " (" << EncStr << ')';
621  }
622  O << '\n';
623}
624
625/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
626/// unsigned leb128 value.
627void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
628  if (MAI->hasLEB128()) {
629    O << "\t.uleb128\t"
630      << Value;
631  } else {
632    O << MAI->getData8bitsDirective();
633    PrintULEB128(Value);
634  }
635}
636
637/// EmitSLEB128Bytes - print an assembler byte data directive to compose a
638/// signed leb128 value.
639void AsmPrinter::EmitSLEB128Bytes(int Value) const {
640  if (MAI->hasLEB128()) {
641    O << "\t.sleb128\t"
642      << Value;
643  } else {
644    O << MAI->getData8bitsDirective();
645    PrintSLEB128(Value);
646  }
647}
648
649/// EmitInt8 - Emit a byte directive and value.
650///
651void AsmPrinter::EmitInt8(int Value) const {
652  O << MAI->getData8bitsDirective();
653  PrintHex(Value & 0xFF);
654}
655
656/// EmitInt16 - Emit a short directive and value.
657///
658void AsmPrinter::EmitInt16(int Value) const {
659  O << MAI->getData16bitsDirective();
660  PrintHex(Value & 0xFFFF);
661}
662
663/// EmitInt32 - Emit a long directive and value.
664///
665void AsmPrinter::EmitInt32(int Value) const {
666  O << MAI->getData32bitsDirective();
667  PrintHex(Value);
668}
669
670/// EmitInt64 - Emit a long long directive and value.
671///
672void AsmPrinter::EmitInt64(uint64_t Value) const {
673  if (MAI->getData64bitsDirective()) {
674    O << MAI->getData64bitsDirective();
675    PrintHex(Value);
676  } else {
677    if (TM.getTargetData()->isBigEndian()) {
678      EmitInt32(unsigned(Value >> 32)); O << '\n';
679      EmitInt32(unsigned(Value));
680    } else {
681      EmitInt32(unsigned(Value)); O << '\n';
682      EmitInt32(unsigned(Value >> 32));
683    }
684  }
685}
686
687/// toOctal - Convert the low order bits of X into an octal digit.
688///
689static inline char toOctal(int X) {
690  return (X&7)+'0';
691}
692
693/// printStringChar - Print a char, escaped if necessary.
694///
695static void printStringChar(formatted_raw_ostream &O, unsigned char C) {
696  if (C == '"') {
697    O << "\\\"";
698  } else if (C == '\\') {
699    O << "\\\\";
700  } else if (isprint((unsigned char)C)) {
701    O << C;
702  } else {
703    switch(C) {
704    case '\b': O << "\\b"; break;
705    case '\f': O << "\\f"; break;
706    case '\n': O << "\\n"; break;
707    case '\r': O << "\\r"; break;
708    case '\t': O << "\\t"; break;
709    default:
710      O << '\\';
711      O << toOctal(C >> 6);
712      O << toOctal(C >> 3);
713      O << toOctal(C >> 0);
714      break;
715    }
716  }
717}
718
719/// EmitString - Emit a string with quotes and a null terminator.
720/// Special characters are emitted properly.
721/// \literal (Eg. '\t') \endliteral
722void AsmPrinter::EmitString(const std::string &String) const {
723  EmitString(String.c_str(), String.size());
724}
725
726void AsmPrinter::EmitString(const char *String, unsigned Size) const {
727  const char* AscizDirective = MAI->getAscizDirective();
728  if (AscizDirective)
729    O << AscizDirective;
730  else
731    O << MAI->getAsciiDirective();
732  O << '\"';
733  for (unsigned i = 0; i < Size; ++i)
734    printStringChar(O, String[i]);
735  if (AscizDirective)
736    O << '\"';
737  else
738    O << "\\0\"";
739}
740
741
742/// EmitFile - Emit a .file directive.
743void AsmPrinter::EmitFile(unsigned Number, const std::string &Name) const {
744  O << "\t.file\t" << Number << " \"";
745  for (unsigned i = 0, N = Name.size(); i < N; ++i)
746    printStringChar(O, Name[i]);
747  O << '\"';
748}
749
750
751//===----------------------------------------------------------------------===//
752
753// EmitAlignment - Emit an alignment directive to the specified power of
754// two boundary.  For example, if you pass in 3 here, you will get an 8
755// byte alignment.  If a global value is specified, and if that global has
756// an explicit alignment requested, it will unconditionally override the
757// alignment request.  However, if ForcedAlignBits is specified, this value
758// has final say: the ultimate alignment will be the max of ForcedAlignBits
759// and the alignment computed with NumBits and the global.
760//
761// The algorithm is:
762//     Align = NumBits;
763//     if (GV && GV->hasalignment) Align = GV->getalignment();
764//     Align = std::max(Align, ForcedAlignBits);
765//
766void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
767                               unsigned ForcedAlignBits,
768                               bool UseFillExpr) const {
769  if (GV && GV->getAlignment())
770    NumBits = Log2_32(GV->getAlignment());
771  NumBits = std::max(NumBits, ForcedAlignBits);
772
773  if (NumBits == 0) return;   // No need to emit alignment.
774
775  unsigned FillValue = 0;
776  if (getCurrentSection()->getKind().isText())
777    FillValue = MAI->getTextAlignFillValue();
778
779  OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0);
780}
781
782/// EmitZeros - Emit a block of zeros.
783///
784void AsmPrinter::EmitZeros(uint64_t NumZeros, unsigned AddrSpace) const {
785  if (NumZeros) {
786    if (MAI->getZeroDirective()) {
787      O << MAI->getZeroDirective() << NumZeros;
788      if (MAI->getZeroDirectiveSuffix())
789        O << MAI->getZeroDirectiveSuffix();
790      O << '\n';
791    } else {
792      for (; NumZeros; --NumZeros)
793        O << MAI->getData8bitsDirective(AddrSpace) << "0\n";
794    }
795  }
796}
797
798// Print out the specified constant, without a storage class.  Only the
799// constants valid in constant expressions can occur here.
800void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
801  if (CV->isNullValue() || isa<UndefValue>(CV))
802    O << '0';
803  else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
804    O << CI->getZExtValue();
805  } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
806    // This is a constant address for a global variable or function. Use the
807    // name of the variable or function as the address value.
808    O << Mang->getMangledName(GV);
809  } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
810    const TargetData *TD = TM.getTargetData();
811    unsigned Opcode = CE->getOpcode();
812    switch (Opcode) {
813    case Instruction::Trunc:
814    case Instruction::ZExt:
815    case Instruction::SExt:
816    case Instruction::FPTrunc:
817    case Instruction::FPExt:
818    case Instruction::UIToFP:
819    case Instruction::SIToFP:
820    case Instruction::FPToUI:
821    case Instruction::FPToSI:
822      llvm_unreachable("FIXME: Don't support this constant cast expr");
823    case Instruction::GetElementPtr: {
824      // generate a symbolic expression for the byte address
825      const Constant *ptrVal = CE->getOperand(0);
826      SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
827      if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
828                                                idxVec.size())) {
829        // Truncate/sext the offset to the pointer size.
830        if (TD->getPointerSizeInBits() != 64) {
831          int SExtAmount = 64-TD->getPointerSizeInBits();
832          Offset = (Offset << SExtAmount) >> SExtAmount;
833        }
834
835        if (Offset)
836          O << '(';
837        EmitConstantValueOnly(ptrVal);
838        if (Offset > 0)
839          O << ") + " << Offset;
840        else if (Offset < 0)
841          O << ") - " << -Offset;
842      } else {
843        EmitConstantValueOnly(ptrVal);
844      }
845      break;
846    }
847    case Instruction::BitCast:
848      return EmitConstantValueOnly(CE->getOperand(0));
849
850    case Instruction::IntToPtr: {
851      // Handle casts to pointers by changing them into casts to the appropriate
852      // integer type.  This promotes constant folding and simplifies this code.
853      Constant *Op = CE->getOperand(0);
854      Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(CV->getContext()),
855                                        false/*ZExt*/);
856      return EmitConstantValueOnly(Op);
857    }
858
859
860    case Instruction::PtrToInt: {
861      // Support only foldable casts to/from pointers that can be eliminated by
862      // changing the pointer to the appropriately sized integer type.
863      Constant *Op = CE->getOperand(0);
864      const Type *Ty = CE->getType();
865
866      // We can emit the pointer value into this slot if the slot is an
867      // integer slot greater or equal to the size of the pointer.
868      if (TD->getTypeAllocSize(Ty) == TD->getTypeAllocSize(Op->getType()))
869        return EmitConstantValueOnly(Op);
870
871      O << "((";
872      EmitConstantValueOnly(Op);
873      APInt ptrMask =
874        APInt::getAllOnesValue(TD->getTypeAllocSizeInBits(Op->getType()));
875
876      SmallString<40> S;
877      ptrMask.toStringUnsigned(S);
878      O << ") & " << S.str() << ')';
879      break;
880    }
881    case Instruction::Add:
882    case Instruction::Sub:
883    case Instruction::And:
884    case Instruction::Or:
885    case Instruction::Xor:
886      O << '(';
887      EmitConstantValueOnly(CE->getOperand(0));
888      O << ')';
889      switch (Opcode) {
890      case Instruction::Add:
891       O << " + ";
892       break;
893      case Instruction::Sub:
894       O << " - ";
895       break;
896      case Instruction::And:
897       O << " & ";
898       break;
899      case Instruction::Or:
900       O << " | ";
901       break;
902      case Instruction::Xor:
903       O << " ^ ";
904       break;
905      default:
906       break;
907      }
908      O << '(';
909      EmitConstantValueOnly(CE->getOperand(1));
910      O << ')';
911      break;
912    default:
913      llvm_unreachable("Unsupported operator!");
914    }
915  } else {
916    llvm_unreachable("Unknown constant value!");
917  }
918}
919
920/// printAsCString - Print the specified array as a C compatible string, only if
921/// the predicate isString is true.
922///
923static void printAsCString(formatted_raw_ostream &O, const ConstantArray *CVA,
924                           unsigned LastElt) {
925  assert(CVA->isString() && "Array is not string compatible!");
926
927  O << '\"';
928  for (unsigned i = 0; i != LastElt; ++i) {
929    unsigned char C =
930        (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
931    printStringChar(O, C);
932  }
933  O << '\"';
934}
935
936/// EmitString - Emit a zero-byte-terminated string constant.
937///
938void AsmPrinter::EmitString(const ConstantArray *CVA) const {
939  unsigned NumElts = CVA->getNumOperands();
940  if (MAI->getAscizDirective() && NumElts &&
941      cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
942    O << MAI->getAscizDirective();
943    printAsCString(O, CVA, NumElts-1);
944  } else {
945    O << MAI->getAsciiDirective();
946    printAsCString(O, CVA, NumElts);
947  }
948  O << '\n';
949}
950
951void AsmPrinter::EmitGlobalConstantArray(const ConstantArray *CVA,
952                                         unsigned AddrSpace) {
953  if (CVA->isString()) {
954    EmitString(CVA);
955  } else { // Not a string.  Print the values in successive locations
956    for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
957      EmitGlobalConstant(CVA->getOperand(i), AddrSpace);
958  }
959}
960
961void AsmPrinter::EmitGlobalConstantVector(const ConstantVector *CP) {
962  const VectorType *PTy = CP->getType();
963
964  for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
965    EmitGlobalConstant(CP->getOperand(I));
966}
967
968void AsmPrinter::EmitGlobalConstantStruct(const ConstantStruct *CVS,
969                                          unsigned AddrSpace) {
970  // Print the fields in successive locations. Pad to align if needed!
971  const TargetData *TD = TM.getTargetData();
972  unsigned Size = TD->getTypeAllocSize(CVS->getType());
973  const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
974  uint64_t sizeSoFar = 0;
975  for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
976    const Constant* field = CVS->getOperand(i);
977
978    // Check if padding is needed and insert one or more 0s.
979    uint64_t fieldSize = TD->getTypeAllocSize(field->getType());
980    uint64_t padSize = ((i == e-1 ? Size : cvsLayout->getElementOffset(i+1))
981                        - cvsLayout->getElementOffset(i)) - fieldSize;
982    sizeSoFar += fieldSize + padSize;
983
984    // Now print the actual field value.
985    EmitGlobalConstant(field, AddrSpace);
986
987    // Insert padding - this may include padding to increase the size of the
988    // current field up to the ABI size (if the struct is not packed) as well
989    // as padding to ensure that the next field starts at the right offset.
990    EmitZeros(padSize, AddrSpace);
991  }
992  assert(sizeSoFar == cvsLayout->getSizeInBytes() &&
993         "Layout of constant struct may be incorrect!");
994}
995
996void AsmPrinter::EmitGlobalConstantFP(const ConstantFP *CFP,
997                                      unsigned AddrSpace) {
998  // FP Constants are printed as integer constants to avoid losing
999  // precision...
1000  LLVMContext &Context = CFP->getContext();
1001  const TargetData *TD = TM.getTargetData();
1002  if (CFP->getType() == Type::getDoubleTy(Context)) {
1003    double Val = CFP->getValueAPF().convertToDouble();  // for comment only
1004    uint64_t i = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1005    if (MAI->getData64bitsDirective(AddrSpace)) {
1006      O << MAI->getData64bitsDirective(AddrSpace) << i;
1007      if (VerboseAsm) {
1008        O.PadToColumn(MAI->getCommentColumn());
1009        O << MAI->getCommentString() << " double " << Val;
1010      }
1011      O << '\n';
1012    } else if (TD->isBigEndian()) {
1013      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1014      if (VerboseAsm) {
1015        O.PadToColumn(MAI->getCommentColumn());
1016        O << MAI->getCommentString()
1017          << " most significant word of double " << Val;
1018      }
1019      O << '\n';
1020      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1021      if (VerboseAsm) {
1022        O.PadToColumn(MAI->getCommentColumn());
1023        O << MAI->getCommentString()
1024          << " least significant word of double " << Val;
1025      }
1026      O << '\n';
1027    } else {
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      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1036      if (VerboseAsm) {
1037        O.PadToColumn(MAI->getCommentColumn());
1038        O << MAI->getCommentString()
1039          << " most significant word of double " << Val;
1040      }
1041      O << '\n';
1042    }
1043    return;
1044  } else if (CFP->getType() == Type::getFloatTy(Context)) {
1045    float Val = CFP->getValueAPF().convertToFloat();  // for comment only
1046    O << MAI->getData32bitsDirective(AddrSpace)
1047      << CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1048    if (VerboseAsm) {
1049      O.PadToColumn(MAI->getCommentColumn());
1050      O << MAI->getCommentString() << " float " << Val;
1051    }
1052    O << '\n';
1053    return;
1054  } else if (CFP->getType() == Type::getX86_FP80Ty(Context)) {
1055    // all long double variants are printed as hex
1056    // api needed to prevent premature destruction
1057    APInt api = CFP->getValueAPF().bitcastToAPInt();
1058    const uint64_t *p = api.getRawData();
1059    // Convert to double so we can print the approximate val as a comment.
1060    APFloat DoubleVal = CFP->getValueAPF();
1061    bool ignored;
1062    DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1063                      &ignored);
1064    if (TD->isBigEndian()) {
1065      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1066      if (VerboseAsm) {
1067        O.PadToColumn(MAI->getCommentColumn());
1068        O << MAI->getCommentString()
1069          << " most significant halfword of x86_fp80 ~"
1070          << DoubleVal.convertToDouble();
1071      }
1072      O << '\n';
1073      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1074      if (VerboseAsm) {
1075        O.PadToColumn(MAI->getCommentColumn());
1076        O << MAI->getCommentString() << " next halfword";
1077      }
1078      O << '\n';
1079      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1080      if (VerboseAsm) {
1081        O.PadToColumn(MAI->getCommentColumn());
1082        O << MAI->getCommentString() << " next halfword";
1083      }
1084      O << '\n';
1085      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1086      if (VerboseAsm) {
1087        O.PadToColumn(MAI->getCommentColumn());
1088        O << MAI->getCommentString() << " next halfword";
1089      }
1090      O << '\n';
1091      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1092      if (VerboseAsm) {
1093        O.PadToColumn(MAI->getCommentColumn());
1094        O << MAI->getCommentString()
1095          << " least significant halfword";
1096      }
1097      O << '\n';
1098     } else {
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 of x86_fp80 ~"
1104          << DoubleVal.convertToDouble();
1105      }
1106      O << '\n';
1107      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1108      if (VerboseAsm) {
1109        O.PadToColumn(MAI->getCommentColumn());
1110        O << MAI->getCommentString()
1111          << " next halfword";
1112      }
1113      O << '\n';
1114      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1115      if (VerboseAsm) {
1116        O.PadToColumn(MAI->getCommentColumn());
1117        O << MAI->getCommentString()
1118          << " next halfword";
1119      }
1120      O << '\n';
1121      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1122      if (VerboseAsm) {
1123        O.PadToColumn(MAI->getCommentColumn());
1124        O << MAI->getCommentString()
1125          << " next halfword";
1126      }
1127      O << '\n';
1128      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1129      if (VerboseAsm) {
1130        O.PadToColumn(MAI->getCommentColumn());
1131        O << MAI->getCommentString()
1132          << " most significant halfword";
1133      }
1134      O << '\n';
1135    }
1136    EmitZeros(TD->getTypeAllocSize(Type::getX86_FP80Ty(Context)) -
1137              TD->getTypeStoreSize(Type::getX86_FP80Ty(Context)), AddrSpace);
1138    return;
1139  } else if (CFP->getType() == Type::getPPC_FP128Ty(Context)) {
1140    // all long double variants are printed as hex
1141    // api needed to prevent premature destruction
1142    APInt api = CFP->getValueAPF().bitcastToAPInt();
1143    const uint64_t *p = api.getRawData();
1144    if (TD->isBigEndian()) {
1145      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1146      if (VerboseAsm) {
1147        O.PadToColumn(MAI->getCommentColumn());
1148        O << MAI->getCommentString()
1149          << " most significant word of ppc_fp128";
1150      }
1151      O << '\n';
1152      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1153      if (VerboseAsm) {
1154        O.PadToColumn(MAI->getCommentColumn());
1155        O << MAI->getCommentString()
1156        << " next word";
1157      }
1158      O << '\n';
1159      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1160      if (VerboseAsm) {
1161        O.PadToColumn(MAI->getCommentColumn());
1162        O << MAI->getCommentString()
1163          << " next word";
1164      }
1165      O << '\n';
1166      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
1167      if (VerboseAsm) {
1168        O.PadToColumn(MAI->getCommentColumn());
1169        O << MAI->getCommentString()
1170          << " least significant word";
1171      }
1172      O << '\n';
1173     } else {
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 of ppc_fp128";
1179      }
1180      O << '\n';
1181      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1182      if (VerboseAsm) {
1183        O.PadToColumn(MAI->getCommentColumn());
1184        O << MAI->getCommentString()
1185          << " next word";
1186      }
1187      O << '\n';
1188      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1189      if (VerboseAsm) {
1190        O.PadToColumn(MAI->getCommentColumn());
1191        O << MAI->getCommentString()
1192          << " next word";
1193      }
1194      O << '\n';
1195      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1196      if (VerboseAsm) {
1197        O.PadToColumn(MAI->getCommentColumn());
1198        O << MAI->getCommentString()
1199          << " most significant word";
1200      }
1201      O << '\n';
1202    }
1203    return;
1204  } else llvm_unreachable("Floating point constant type not handled");
1205}
1206
1207void AsmPrinter::EmitGlobalConstantLargeInt(const ConstantInt *CI,
1208                                            unsigned AddrSpace) {
1209  const TargetData *TD = TM.getTargetData();
1210  unsigned BitWidth = CI->getBitWidth();
1211  assert(isPowerOf2_32(BitWidth) &&
1212         "Non-power-of-2-sized integers not handled!");
1213
1214  // We don't expect assemblers to support integer data directives
1215  // for more than 64 bits, so we emit the data in at most 64-bit
1216  // quantities at a time.
1217  const uint64_t *RawData = CI->getValue().getRawData();
1218  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1219    uint64_t Val;
1220    if (TD->isBigEndian())
1221      Val = RawData[e - i - 1];
1222    else
1223      Val = RawData[i];
1224
1225    if (MAI->getData64bitsDirective(AddrSpace))
1226      O << MAI->getData64bitsDirective(AddrSpace) << Val << '\n';
1227    else if (TD->isBigEndian()) {
1228      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32);
1229      if (VerboseAsm) {
1230        O.PadToColumn(MAI->getCommentColumn());
1231        O << MAI->getCommentString()
1232          << " most significant half of i64 " << Val;
1233      }
1234      O << '\n';
1235      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(Val);
1236      if (VerboseAsm) {
1237        O.PadToColumn(MAI->getCommentColumn());
1238        O << MAI->getCommentString()
1239          << " least significant half of i64 " << Val;
1240      }
1241      O << '\n';
1242    } else {
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      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32);
1251      if (VerboseAsm) {
1252        O.PadToColumn(MAI->getCommentColumn());
1253        O << MAI->getCommentString()
1254          << " most significant half of i64 " << Val;
1255      }
1256      O << '\n';
1257    }
1258  }
1259}
1260
1261/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1262void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1263  const TargetData *TD = TM.getTargetData();
1264  const Type *type = CV->getType();
1265  unsigned Size = TD->getTypeAllocSize(type);
1266
1267  if (CV->isNullValue() || isa<UndefValue>(CV)) {
1268    EmitZeros(Size, AddrSpace);
1269    return;
1270  } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
1271    EmitGlobalConstantArray(CVA , AddrSpace);
1272    return;
1273  } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
1274    EmitGlobalConstantStruct(CVS, AddrSpace);
1275    return;
1276  } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
1277    EmitGlobalConstantFP(CFP, AddrSpace);
1278    return;
1279  } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1280    // Small integers are handled below; large integers are handled here.
1281    if (Size > 4) {
1282      EmitGlobalConstantLargeInt(CI, AddrSpace);
1283      return;
1284    }
1285  } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) {
1286    EmitGlobalConstantVector(CP);
1287    return;
1288  }
1289
1290  printDataDirective(type, AddrSpace);
1291  EmitConstantValueOnly(CV);
1292  if (VerboseAsm) {
1293    if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1294      SmallString<40> S;
1295      CI->getValue().toStringUnsigned(S, 16);
1296      O.PadToColumn(MAI->getCommentColumn());
1297      O << MAI->getCommentString() << " 0x" << S.str();
1298    }
1299  }
1300  O << '\n';
1301}
1302
1303void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1304  // Target doesn't support this yet!
1305  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1306}
1307
1308/// PrintSpecial - Print information related to the specified machine instr
1309/// that is independent of the operand, and may be independent of the instr
1310/// itself.  This can be useful for portably encoding the comment character
1311/// or other bits of target-specific knowledge into the asmstrings.  The
1312/// syntax used is ${:comment}.  Targets can override this to add support
1313/// for their own strange codes.
1314void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1315  if (!strcmp(Code, "private")) {
1316    O << MAI->getPrivateGlobalPrefix();
1317  } else if (!strcmp(Code, "comment")) {
1318    if (VerboseAsm)
1319      O << MAI->getCommentString();
1320  } else if (!strcmp(Code, "uid")) {
1321    // Comparing the address of MI isn't sufficient, because machineinstrs may
1322    // be allocated to the same address across functions.
1323    const Function *ThisF = MI->getParent()->getParent()->getFunction();
1324
1325    // If this is a new LastFn instruction, bump the counter.
1326    if (LastMI != MI || LastFn != ThisF) {
1327      ++Counter;
1328      LastMI = MI;
1329      LastFn = ThisF;
1330    }
1331    O << Counter;
1332  } else {
1333    std::string msg;
1334    raw_string_ostream Msg(msg);
1335    Msg << "Unknown special formatter '" << Code
1336         << "' for machine instr: " << *MI;
1337    llvm_report_error(Msg.str());
1338  }
1339}
1340
1341/// processDebugLoc - Processes the debug information of each machine
1342/// instruction's DebugLoc.
1343void AsmPrinter::processDebugLoc(DebugLoc DL) {
1344  if (!MAI || !DW)
1345    return;
1346
1347  if (MAI->doesSupportDebugInformation() && DW->ShouldEmitDwarfDebug()) {
1348    if (!DL.isUnknown()) {
1349      DebugLocTuple CurDLT = MF->getDebugLocTuple(DL);
1350
1351      if (CurDLT.CompileUnit != 0 && PrevDLT != CurDLT) {
1352        printLabel(DW->RecordSourceLine(CurDLT.Line, CurDLT.Col,
1353                                        DICompileUnit(CurDLT.CompileUnit)));
1354        O << '\n';
1355      }
1356
1357      PrevDLT = CurDLT;
1358    }
1359  }
1360}
1361
1362/// printInlineAsm - This method formats and prints the specified machine
1363/// instruction that is an inline asm.
1364void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1365  unsigned NumOperands = MI->getNumOperands();
1366
1367  // Count the number of register definitions.
1368  unsigned NumDefs = 0;
1369  for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1370       ++NumDefs)
1371    assert(NumDefs != NumOperands-1 && "No asm string?");
1372
1373  assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1374
1375  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1376  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1377
1378  // If this asmstr is empty, just print the #APP/#NOAPP markers.
1379  // These are useful to see where empty asm's wound up.
1380  if (AsmStr[0] == 0) {
1381    O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1382    O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
1383    return;
1384  }
1385
1386  O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1387
1388  // The variant of the current asmprinter.
1389  int AsmPrinterVariant = MAI->getAssemblerDialect();
1390
1391  int CurVariant = -1;            // The number of the {.|.|.} region we are in.
1392  const char *LastEmitted = AsmStr; // One past the last character emitted.
1393
1394  while (*LastEmitted) {
1395    switch (*LastEmitted) {
1396    default: {
1397      // Not a special case, emit the string section literally.
1398      const char *LiteralEnd = LastEmitted+1;
1399      while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1400             *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1401        ++LiteralEnd;
1402      if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1403        O.write(LastEmitted, LiteralEnd-LastEmitted);
1404      LastEmitted = LiteralEnd;
1405      break;
1406    }
1407    case '\n':
1408      ++LastEmitted;   // Consume newline character.
1409      O << '\n';       // Indent code with newline.
1410      break;
1411    case '$': {
1412      ++LastEmitted;   // Consume '$' character.
1413      bool Done = true;
1414
1415      // Handle escapes.
1416      switch (*LastEmitted) {
1417      default: Done = false; break;
1418      case '$':     // $$ -> $
1419        if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1420          O << '$';
1421        ++LastEmitted;  // Consume second '$' character.
1422        break;
1423      case '(':             // $( -> same as GCC's { character.
1424        ++LastEmitted;      // Consume '(' character.
1425        if (CurVariant != -1) {
1426          llvm_report_error("Nested variants found in inline asm string: '"
1427                            + std::string(AsmStr) + "'");
1428        }
1429        CurVariant = 0;     // We're in the first variant now.
1430        break;
1431      case '|':
1432        ++LastEmitted;  // consume '|' character.
1433        if (CurVariant == -1)
1434          O << '|';       // this is gcc's behavior for | outside a variant
1435        else
1436          ++CurVariant;   // We're in the next variant.
1437        break;
1438      case ')':         // $) -> same as GCC's } char.
1439        ++LastEmitted;  // consume ')' character.
1440        if (CurVariant == -1)
1441          O << '}';     // this is gcc's behavior for } outside a variant
1442        else
1443          CurVariant = -1;
1444        break;
1445      }
1446      if (Done) break;
1447
1448      bool HasCurlyBraces = false;
1449      if (*LastEmitted == '{') {     // ${variable}
1450        ++LastEmitted;               // Consume '{' character.
1451        HasCurlyBraces = true;
1452      }
1453
1454      // If we have ${:foo}, then this is not a real operand reference, it is a
1455      // "magic" string reference, just like in .td files.  Arrange to call
1456      // PrintSpecial.
1457      if (HasCurlyBraces && *LastEmitted == ':') {
1458        ++LastEmitted;
1459        const char *StrStart = LastEmitted;
1460        const char *StrEnd = strchr(StrStart, '}');
1461        if (StrEnd == 0) {
1462          llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1463                            + std::string(AsmStr) + "'");
1464        }
1465
1466        std::string Val(StrStart, StrEnd);
1467        PrintSpecial(MI, Val.c_str());
1468        LastEmitted = StrEnd+1;
1469        break;
1470      }
1471
1472      const char *IDStart = LastEmitted;
1473      char *IDEnd;
1474      errno = 0;
1475      long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1476      if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1477        llvm_report_error("Bad $ operand number in inline asm string: '"
1478                          + std::string(AsmStr) + "'");
1479      }
1480      LastEmitted = IDEnd;
1481
1482      char Modifier[2] = { 0, 0 };
1483
1484      if (HasCurlyBraces) {
1485        // If we have curly braces, check for a modifier character.  This
1486        // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1487        if (*LastEmitted == ':') {
1488          ++LastEmitted;    // Consume ':' character.
1489          if (*LastEmitted == 0) {
1490            llvm_report_error("Bad ${:} expression in inline asm string: '"
1491                              + std::string(AsmStr) + "'");
1492          }
1493
1494          Modifier[0] = *LastEmitted;
1495          ++LastEmitted;    // Consume modifier character.
1496        }
1497
1498        if (*LastEmitted != '}') {
1499          llvm_report_error("Bad ${} expression in inline asm string: '"
1500                            + std::string(AsmStr) + "'");
1501        }
1502        ++LastEmitted;    // Consume '}' character.
1503      }
1504
1505      if ((unsigned)Val >= NumOperands-1) {
1506        llvm_report_error("Invalid $ operand number in inline asm string: '"
1507                          + std::string(AsmStr) + "'");
1508      }
1509
1510      // Okay, we finally have a value number.  Ask the target to print this
1511      // operand!
1512      if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1513        unsigned OpNo = 1;
1514
1515        bool Error = false;
1516
1517        // Scan to find the machine operand number for the operand.
1518        for (; Val; --Val) {
1519          if (OpNo >= MI->getNumOperands()) break;
1520          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1521          OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1522        }
1523
1524        if (OpNo >= MI->getNumOperands()) {
1525          Error = true;
1526        } else {
1527          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1528          ++OpNo;  // Skip over the ID number.
1529
1530          if (Modifier[0]=='l')  // labels are target independent
1531            GetMBBSymbol(MI->getOperand(OpNo).getMBB()
1532                           ->getNumber())->print(O, MAI);
1533          else {
1534            AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1535            if ((OpFlags & 7) == 4) {
1536              Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1537                                                Modifier[0] ? Modifier : 0);
1538            } else {
1539              Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1540                                          Modifier[0] ? Modifier : 0);
1541            }
1542          }
1543        }
1544        if (Error) {
1545          std::string msg;
1546          raw_string_ostream Msg(msg);
1547          Msg << "Invalid operand found in inline asm: '"
1548               << AsmStr << "'\n";
1549          MI->print(Msg);
1550          llvm_report_error(Msg.str());
1551        }
1552      }
1553      break;
1554    }
1555    }
1556  }
1557  O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd();
1558}
1559
1560/// printImplicitDef - This method prints the specified machine instruction
1561/// that is an implicit def.
1562void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1563  if (!VerboseAsm) return;
1564  O.PadToColumn(MAI->getCommentColumn());
1565  O << MAI->getCommentString() << " implicit-def: "
1566    << TRI->getName(MI->getOperand(0).getReg());
1567}
1568
1569/// printLabel - This method prints a local label used by debug and
1570/// exception handling tables.
1571void AsmPrinter::printLabel(const MachineInstr *MI) const {
1572  printLabel(MI->getOperand(0).getImm());
1573}
1574
1575void AsmPrinter::printLabel(unsigned Id) const {
1576  O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':';
1577}
1578
1579/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1580/// instruction, using the specified assembler variant.  Targets should
1581/// overried this to format as appropriate.
1582bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1583                                 unsigned AsmVariant, const char *ExtraCode) {
1584  // Target doesn't support this yet!
1585  return true;
1586}
1587
1588bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1589                                       unsigned AsmVariant,
1590                                       const char *ExtraCode) {
1591  // Target doesn't support this yet!
1592  return true;
1593}
1594
1595MCSymbol *AsmPrinter::GetMBBSymbol(unsigned MBBID) const {
1596  SmallString<60> Name;
1597  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "BB"
1598    << getFunctionNumber() << '_' << MBBID;
1599
1600  return OutContext.GetOrCreateSymbol(Name.str());
1601}
1602
1603
1604/// EmitBasicBlockStart - This method prints the label for the specified
1605/// MachineBasicBlock, an alignment (if present) and a comment describing
1606/// it if appropriate.
1607void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
1608  if (unsigned Align = MBB->getAlignment())
1609    EmitAlignment(Log2_32(Align));
1610
1611  GetMBBSymbol(MBB->getNumber())->print(O, MAI);
1612  O << ':';
1613
1614  if (VerboseAsm) {
1615    if (const BasicBlock *BB = MBB->getBasicBlock())
1616      if (BB->hasName()) {
1617        O.PadToColumn(MAI->getCommentColumn());
1618        O << MAI->getCommentString() << ' ';
1619        WriteAsOperand(O, BB, /*PrintType=*/false);
1620      }
1621
1622    EmitComments(*MBB);
1623  }
1624}
1625
1626/// printPICJumpTableSetLabel - This method prints a set label for the
1627/// specified MachineBasicBlock for a jumptable entry.
1628void AsmPrinter::printPICJumpTableSetLabel(unsigned uid,
1629                                           const MachineBasicBlock *MBB) const {
1630  if (!MAI->getSetDirective())
1631    return;
1632
1633  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1634    << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
1635  GetMBBSymbol(MBB->getNumber())->print(O, MAI);
1636  O << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1637    << '_' << uid << '\n';
1638}
1639
1640void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
1641                                           const MachineBasicBlock *MBB) const {
1642  if (!MAI->getSetDirective())
1643    return;
1644
1645  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1646    << getFunctionNumber() << '_' << uid << '_' << uid2
1647    << "_set_" << MBB->getNumber() << ',';
1648  GetMBBSymbol(MBB->getNumber())->print(O, MAI);
1649  O << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1650    << '_' << uid << '_' << uid2 << '\n';
1651}
1652
1653/// printDataDirective - This method prints the asm directive for the
1654/// specified type.
1655void AsmPrinter::printDataDirective(const Type *type, unsigned AddrSpace) {
1656  const TargetData *TD = TM.getTargetData();
1657  switch (type->getTypeID()) {
1658  case Type::FloatTyID: case Type::DoubleTyID:
1659  case Type::X86_FP80TyID: case Type::FP128TyID: case Type::PPC_FP128TyID:
1660    assert(0 && "Should have already output floating point constant.");
1661  default:
1662    assert(0 && "Can't handle printing this type of thing");
1663  case Type::IntegerTyID: {
1664    unsigned BitWidth = cast<IntegerType>(type)->getBitWidth();
1665    if (BitWidth <= 8)
1666      O << MAI->getData8bitsDirective(AddrSpace);
1667    else if (BitWidth <= 16)
1668      O << MAI->getData16bitsDirective(AddrSpace);
1669    else if (BitWidth <= 32)
1670      O << MAI->getData32bitsDirective(AddrSpace);
1671    else if (BitWidth <= 64) {
1672      assert(MAI->getData64bitsDirective(AddrSpace) &&
1673             "Target cannot handle 64-bit constant exprs!");
1674      O << MAI->getData64bitsDirective(AddrSpace);
1675    } else {
1676      llvm_unreachable("Target cannot handle given data directive width!");
1677    }
1678    break;
1679  }
1680  case Type::PointerTyID:
1681    if (TD->getPointerSize() == 8) {
1682      assert(MAI->getData64bitsDirective(AddrSpace) &&
1683             "Target cannot handle 64-bit pointer exprs!");
1684      O << MAI->getData64bitsDirective(AddrSpace);
1685    } else if (TD->getPointerSize() == 2) {
1686      O << MAI->getData16bitsDirective(AddrSpace);
1687    } else if (TD->getPointerSize() == 1) {
1688      O << MAI->getData8bitsDirective(AddrSpace);
1689    } else {
1690      O << MAI->getData32bitsDirective(AddrSpace);
1691    }
1692    break;
1693  }
1694}
1695
1696void AsmPrinter::printVisibility(const std::string& Name,
1697                                 unsigned Visibility) const {
1698  if (Visibility == GlobalValue::HiddenVisibility) {
1699    if (const char *Directive = MAI->getHiddenDirective())
1700      O << Directive << Name << '\n';
1701  } else if (Visibility == GlobalValue::ProtectedVisibility) {
1702    if (const char *Directive = MAI->getProtectedDirective())
1703      O << Directive << Name << '\n';
1704  }
1705}
1706
1707void AsmPrinter::printOffset(int64_t Offset) const {
1708  if (Offset > 0)
1709    O << '+' << Offset;
1710  else if (Offset < 0)
1711    O << Offset;
1712}
1713
1714GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1715  if (!S->usesMetadata())
1716    return 0;
1717
1718  gcp_iterator GCPI = GCMetadataPrinters.find(S);
1719  if (GCPI != GCMetadataPrinters.end())
1720    return GCPI->second;
1721
1722  const char *Name = S->getName().c_str();
1723
1724  for (GCMetadataPrinterRegistry::iterator
1725         I = GCMetadataPrinterRegistry::begin(),
1726         E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1727    if (strcmp(Name, I->getName()) == 0) {
1728      GCMetadataPrinter *GMP = I->instantiate();
1729      GMP->S = S;
1730      GCMetadataPrinters.insert(std::make_pair(S, GMP));
1731      return GMP;
1732    }
1733
1734  errs() << "no GCMetadataPrinter registered for GC: " << Name << "\n";
1735  llvm_unreachable(0);
1736}
1737
1738/// EmitComments - Pretty-print comments for instructions
1739void AsmPrinter::EmitComments(const MachineInstr &MI) const {
1740  assert(VerboseAsm && !MI.getDebugLoc().isUnknown());
1741
1742  DebugLocTuple DLT = MF->getDebugLocTuple(MI.getDebugLoc());
1743
1744  // Print source line info.
1745  O.PadToColumn(MAI->getCommentColumn());
1746  O << MAI->getCommentString() << " SrcLine ";
1747  if (DLT.CompileUnit) {
1748    std::string Str;
1749    DICompileUnit CU(DLT.CompileUnit);
1750    O << CU.getFilename(Str) << " ";
1751  }
1752  O << DLT.Line;
1753  if (DLT.Col != 0)
1754    O << ":" << DLT.Col;
1755}
1756
1757/// PrintChildLoopComment - Print comments about child loops within
1758/// the loop for this basic block, with nesting.
1759///
1760static void PrintChildLoopComment(formatted_raw_ostream &O,
1761                                  const MachineLoop *loop,
1762                                  const MCAsmInfo *MAI,
1763                                  int FunctionNumber) {
1764  // Add child loop information
1765  for(MachineLoop::iterator cl = loop->begin(),
1766        clend = loop->end();
1767      cl != clend;
1768      ++cl) {
1769    MachineBasicBlock *Header = (*cl)->getHeader();
1770    assert(Header && "No header for loop");
1771
1772    O << '\n';
1773    O.PadToColumn(MAI->getCommentColumn());
1774
1775    O << MAI->getCommentString();
1776    O.indent(((*cl)->getLoopDepth()-1)*2)
1777      << " Child Loop BB" << FunctionNumber << "_"
1778      << Header->getNumber() << " Depth " << (*cl)->getLoopDepth();
1779
1780    PrintChildLoopComment(O, *cl, MAI, FunctionNumber);
1781  }
1782}
1783
1784/// EmitComments - Pretty-print comments for basic blocks
1785void AsmPrinter::EmitComments(const MachineBasicBlock &MBB) const
1786{
1787  if (VerboseAsm) {
1788    // Add loop depth information
1789    const MachineLoop *loop = LI->getLoopFor(&MBB);
1790
1791    if (loop) {
1792      // Print a newline after bb# annotation.
1793      O << "\n";
1794      O.PadToColumn(MAI->getCommentColumn());
1795      O << MAI->getCommentString() << " Loop Depth " << loop->getLoopDepth()
1796        << '\n';
1797
1798      O.PadToColumn(MAI->getCommentColumn());
1799
1800      MachineBasicBlock *Header = loop->getHeader();
1801      assert(Header && "No header for loop");
1802
1803      if (Header == &MBB) {
1804        O << MAI->getCommentString() << " Loop Header";
1805        PrintChildLoopComment(O, loop, MAI, getFunctionNumber());
1806      }
1807      else {
1808        O << MAI->getCommentString() << " Loop Header is BB"
1809          << getFunctionNumber() << "_" << loop->getHeader()->getNumber();
1810      }
1811
1812      if (loop->empty()) {
1813        O << '\n';
1814        O.PadToColumn(MAI->getCommentColumn());
1815        O << MAI->getCommentString() << " Inner Loop";
1816      }
1817
1818      // Add parent loop information
1819      for (const MachineLoop *CurLoop = loop->getParentLoop();
1820           CurLoop;
1821           CurLoop = CurLoop->getParentLoop()) {
1822        MachineBasicBlock *Header = CurLoop->getHeader();
1823        assert(Header && "No header for loop");
1824
1825        O << '\n';
1826        O.PadToColumn(MAI->getCommentColumn());
1827        O << MAI->getCommentString();
1828        O.indent((CurLoop->getLoopDepth()-1)*2)
1829          << " Inside Loop BB" << getFunctionNumber() << "_"
1830          << Header->getNumber() << " Depth " << CurLoop->getLoopDepth();
1831      }
1832    }
1833  }
1834}
1835