AsmPrinter.cpp revision 662316c997e4eb8c3fdec6999b3e9da03620847a 
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
215std::string
216AsmPrinter::getCurrentFunctionEHName(const MachineFunction *MF) const {
217  assert(MF && "No machine function?");
218  return Mang->getMangledName(MF->getFunction(), ".eh",
219                              MAI->is_EHSymbolPrivate());
220}
221
222void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
223  // What's my mangled name?
224  CurrentFnName = Mang->getMangledName(MF.getFunction());
225  IncrementFunctionNumber();
226
227  if (VerboseAsm) {
228    LI = &getAnalysis<MachineLoopInfo>();
229  }
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/// getGlobalLinkName - Returns the asm/link name of of the specified
513/// global variable.  Should be overridden by each target asm printer to
514/// generate the appropriate value.
515const std::string &AsmPrinter::getGlobalLinkName(const GlobalVariable *GV,
516                                                 std::string &LinkName) const {
517  if (isa<Function>(GV)) {
518    LinkName += MAI->getFunctionAddrPrefix();
519    LinkName += Mang->getMangledName(GV);
520    LinkName += MAI->getFunctionAddrSuffix();
521  } else {
522    LinkName += MAI->getGlobalVarAddrPrefix();
523    LinkName += Mang->getMangledName(GV);
524    LinkName += MAI->getGlobalVarAddrSuffix();
525  }
526
527  return LinkName;
528}
529
530/// EmitExternalGlobal - Emit the external reference to a global variable.
531/// Should be overridden if an indirect reference should be used.
532void AsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) {
533  std::string GLN;
534  O << getGlobalLinkName(GV, GLN);
535}
536
537
538
539//===----------------------------------------------------------------------===//
540/// LEB 128 number encoding.
541
542/// PrintULEB128 - Print a series of hexidecimal values (separated by commas)
543/// representing an unsigned leb128 value.
544void AsmPrinter::PrintULEB128(unsigned Value) const {
545  char Buffer[20];
546  do {
547    unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
548    Value >>= 7;
549    if (Value) Byte |= 0x80;
550    O << "0x" << utohex_buffer(Byte, Buffer+20);
551    if (Value) O << ", ";
552  } while (Value);
553}
554
555/// PrintSLEB128 - Print a series of hexidecimal values (separated by commas)
556/// representing a signed leb128 value.
557void AsmPrinter::PrintSLEB128(int Value) const {
558  int Sign = Value >> (8 * sizeof(Value) - 1);
559  bool IsMore;
560  char Buffer[20];
561
562  do {
563    unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
564    Value >>= 7;
565    IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
566    if (IsMore) Byte |= 0x80;
567    O << "0x" << utohex_buffer(Byte, Buffer+20);
568    if (IsMore) O << ", ";
569  } while (IsMore);
570}
571
572//===--------------------------------------------------------------------===//
573// Emission and print routines
574//
575
576/// PrintHex - Print a value as a hexidecimal value.
577///
578void AsmPrinter::PrintHex(int Value) const {
579  char Buffer[20];
580  O << "0x" << utohex_buffer(static_cast<unsigned>(Value), Buffer+20);
581}
582
583/// EOL - Print a newline character to asm stream.  If a comment is present
584/// then it will be printed first.  Comments should not contain '\n'.
585void AsmPrinter::EOL() const {
586  O << '\n';
587}
588
589void AsmPrinter::EOL(const std::string &Comment) const {
590  if (VerboseAsm && !Comment.empty()) {
591    O.PadToColumn(MAI->getCommentColumn());
592    O << MAI->getCommentString()
593      << ' '
594      << Comment;
595  }
596  O << '\n';
597}
598
599void AsmPrinter::EOL(const char* Comment) const {
600  if (VerboseAsm && *Comment) {
601    O.PadToColumn(MAI->getCommentColumn());
602    O << MAI->getCommentString()
603      << ' '
604      << Comment;
605  }
606  O << '\n';
607}
608
609static const char *DecodeDWARFEncoding(unsigned Encoding) {
610  switch (Encoding) {
611  case dwarf::DW_EH_PE_absptr:
612    return "absptr";
613  case dwarf::DW_EH_PE_omit:
614    return "omit";
615  case dwarf::DW_EH_PE_pcrel:
616    return "pcrel";
617  case dwarf::DW_EH_PE_udata4:
618    return "udata4";
619  case dwarf::DW_EH_PE_udata8:
620    return "udata8";
621  case dwarf::DW_EH_PE_sdata4:
622    return "sdata4";
623  case dwarf::DW_EH_PE_sdata8:
624    return "sdata8";
625  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4:
626    return "pcrel udata4";
627  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4:
628    return "pcrel sdata4";
629  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8:
630    return "pcrel udata8";
631  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8:
632    return "pcrel sdata8";
633  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata4:
634    return "indirect pcrel udata4";
635  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata4:
636    return "indirect pcrel sdata4";
637  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata8:
638    return "indirect pcrel udata8";
639  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata8:
640    return "indirect pcrel sdata8";
641  }
642
643  return 0;
644}
645
646void AsmPrinter::EOL(const char *Comment, unsigned Encoding) const {
647  if (VerboseAsm && *Comment) {
648    O.PadToColumn(MAI->getCommentColumn());
649    O << MAI->getCommentString()
650      << ' '
651      << Comment;
652
653    if (const char *EncStr = DecodeDWARFEncoding(Encoding))
654      O << " (" << EncStr << ')';
655  }
656  O << '\n';
657}
658
659/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
660/// unsigned leb128 value.
661void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
662  if (MAI->hasLEB128()) {
663    O << "\t.uleb128\t"
664      << Value;
665  } else {
666    O << MAI->getData8bitsDirective();
667    PrintULEB128(Value);
668  }
669}
670
671/// EmitSLEB128Bytes - print an assembler byte data directive to compose a
672/// signed leb128 value.
673void AsmPrinter::EmitSLEB128Bytes(int Value) const {
674  if (MAI->hasLEB128()) {
675    O << "\t.sleb128\t"
676      << Value;
677  } else {
678    O << MAI->getData8bitsDirective();
679    PrintSLEB128(Value);
680  }
681}
682
683/// EmitInt8 - Emit a byte directive and value.
684///
685void AsmPrinter::EmitInt8(int Value) const {
686  O << MAI->getData8bitsDirective();
687  PrintHex(Value & 0xFF);
688}
689
690/// EmitInt16 - Emit a short directive and value.
691///
692void AsmPrinter::EmitInt16(int Value) const {
693  O << MAI->getData16bitsDirective();
694  PrintHex(Value & 0xFFFF);
695}
696
697/// EmitInt32 - Emit a long directive and value.
698///
699void AsmPrinter::EmitInt32(int Value) const {
700  O << MAI->getData32bitsDirective();
701  PrintHex(Value);
702}
703
704/// EmitInt64 - Emit a long long directive and value.
705///
706void AsmPrinter::EmitInt64(uint64_t Value) const {
707  if (MAI->getData64bitsDirective()) {
708    O << MAI->getData64bitsDirective();
709    PrintHex(Value);
710  } else {
711    if (TM.getTargetData()->isBigEndian()) {
712      EmitInt32(unsigned(Value >> 32)); O << '\n';
713      EmitInt32(unsigned(Value));
714    } else {
715      EmitInt32(unsigned(Value)); O << '\n';
716      EmitInt32(unsigned(Value >> 32));
717    }
718  }
719}
720
721/// toOctal - Convert the low order bits of X into an octal digit.
722///
723static inline char toOctal(int X) {
724  return (X&7)+'0';
725}
726
727/// printStringChar - Print a char, escaped if necessary.
728///
729static void printStringChar(formatted_raw_ostream &O, unsigned char C) {
730  if (C == '"') {
731    O << "\\\"";
732  } else if (C == '\\') {
733    O << "\\\\";
734  } else if (isprint((unsigned char)C)) {
735    O << C;
736  } else {
737    switch(C) {
738    case '\b': O << "\\b"; break;
739    case '\f': O << "\\f"; break;
740    case '\n': O << "\\n"; break;
741    case '\r': O << "\\r"; break;
742    case '\t': O << "\\t"; break;
743    default:
744      O << '\\';
745      O << toOctal(C >> 6);
746      O << toOctal(C >> 3);
747      O << toOctal(C >> 0);
748      break;
749    }
750  }
751}
752
753/// EmitString - Emit a string with quotes and a null terminator.
754/// Special characters are emitted properly.
755/// \literal (Eg. '\t') \endliteral
756void AsmPrinter::EmitString(const std::string &String) const {
757  EmitString(String.c_str(), String.size());
758}
759
760void AsmPrinter::EmitString(const char *String, unsigned Size) const {
761  const char* AscizDirective = MAI->getAscizDirective();
762  if (AscizDirective)
763    O << AscizDirective;
764  else
765    O << MAI->getAsciiDirective();
766  O << '\"';
767  for (unsigned i = 0; i < Size; ++i)
768    printStringChar(O, String[i]);
769  if (AscizDirective)
770    O << '\"';
771  else
772    O << "\\0\"";
773}
774
775
776/// EmitFile - Emit a .file directive.
777void AsmPrinter::EmitFile(unsigned Number, const std::string &Name) const {
778  O << "\t.file\t" << Number << " \"";
779  for (unsigned i = 0, N = Name.size(); i < N; ++i)
780    printStringChar(O, Name[i]);
781  O << '\"';
782}
783
784
785//===----------------------------------------------------------------------===//
786
787// EmitAlignment - Emit an alignment directive to the specified power of
788// two boundary.  For example, if you pass in 3 here, you will get an 8
789// byte alignment.  If a global value is specified, and if that global has
790// an explicit alignment requested, it will unconditionally override the
791// alignment request.  However, if ForcedAlignBits is specified, this value
792// has final say: the ultimate alignment will be the max of ForcedAlignBits
793// and the alignment computed with NumBits and the global.
794//
795// The algorithm is:
796//     Align = NumBits;
797//     if (GV && GV->hasalignment) Align = GV->getalignment();
798//     Align = std::max(Align, ForcedAlignBits);
799//
800void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
801                               unsigned ForcedAlignBits,
802                               bool UseFillExpr) const {
803  if (GV && GV->getAlignment())
804    NumBits = Log2_32(GV->getAlignment());
805  NumBits = std::max(NumBits, ForcedAlignBits);
806
807  if (NumBits == 0) return;   // No need to emit alignment.
808
809  unsigned FillValue = 0;
810  if (getCurrentSection()->getKind().isText())
811    FillValue = MAI->getTextAlignFillValue();
812
813  OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0);
814}
815
816/// EmitZeros - Emit a block of zeros.
817///
818void AsmPrinter::EmitZeros(uint64_t NumZeros, unsigned AddrSpace) const {
819  if (NumZeros) {
820    if (MAI->getZeroDirective()) {
821      O << MAI->getZeroDirective() << NumZeros;
822      if (MAI->getZeroDirectiveSuffix())
823        O << MAI->getZeroDirectiveSuffix();
824      O << '\n';
825    } else {
826      for (; NumZeros; --NumZeros)
827        O << MAI->getData8bitsDirective(AddrSpace) << "0\n";
828    }
829  }
830}
831
832// Print out the specified constant, without a storage class.  Only the
833// constants valid in constant expressions can occur here.
834void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
835  if (CV->isNullValue() || isa<UndefValue>(CV))
836    O << '0';
837  else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
838    O << CI->getZExtValue();
839  } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
840    // This is a constant address for a global variable or function. Use the
841    // name of the variable or function as the address value, possibly
842    // decorating it with GlobalVarAddrPrefix/Suffix or
843    // FunctionAddrPrefix/Suffix (these all default to "" )
844    if (isa<Function>(GV)) {
845      O << MAI->getFunctionAddrPrefix()
846        << Mang->getMangledName(GV)
847        << MAI->getFunctionAddrSuffix();
848    } else {
849      O << MAI->getGlobalVarAddrPrefix()
850        << Mang->getMangledName(GV)
851        << MAI->getGlobalVarAddrSuffix();
852    }
853  } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
854    const TargetData *TD = TM.getTargetData();
855    unsigned Opcode = CE->getOpcode();
856    switch (Opcode) {
857    case Instruction::Trunc:
858    case Instruction::ZExt:
859    case Instruction::SExt:
860    case Instruction::FPTrunc:
861    case Instruction::FPExt:
862    case Instruction::UIToFP:
863    case Instruction::SIToFP:
864    case Instruction::FPToUI:
865    case Instruction::FPToSI:
866      llvm_unreachable("FIXME: Don't support this constant cast expr");
867    case Instruction::GetElementPtr: {
868      // generate a symbolic expression for the byte address
869      const Constant *ptrVal = CE->getOperand(0);
870      SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
871      if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
872                                                idxVec.size())) {
873        // Truncate/sext the offset to the pointer size.
874        if (TD->getPointerSizeInBits() != 64) {
875          int SExtAmount = 64-TD->getPointerSizeInBits();
876          Offset = (Offset << SExtAmount) >> SExtAmount;
877        }
878
879        if (Offset)
880          O << '(';
881        EmitConstantValueOnly(ptrVal);
882        if (Offset > 0)
883          O << ") + " << Offset;
884        else if (Offset < 0)
885          O << ") - " << -Offset;
886      } else {
887        EmitConstantValueOnly(ptrVal);
888      }
889      break;
890    }
891    case Instruction::BitCast:
892      return EmitConstantValueOnly(CE->getOperand(0));
893
894    case Instruction::IntToPtr: {
895      // Handle casts to pointers by changing them into casts to the appropriate
896      // integer type.  This promotes constant folding and simplifies this code.
897      Constant *Op = CE->getOperand(0);
898      Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(CV->getContext()),
899                                        false/*ZExt*/);
900      return EmitConstantValueOnly(Op);
901    }
902
903
904    case Instruction::PtrToInt: {
905      // Support only foldable casts to/from pointers that can be eliminated by
906      // changing the pointer to the appropriately sized integer type.
907      Constant *Op = CE->getOperand(0);
908      const Type *Ty = CE->getType();
909
910      // We can emit the pointer value into this slot if the slot is an
911      // integer slot greater or equal to the size of the pointer.
912      if (TD->getTypeAllocSize(Ty) == TD->getTypeAllocSize(Op->getType()))
913        return EmitConstantValueOnly(Op);
914
915      O << "((";
916      EmitConstantValueOnly(Op);
917      APInt ptrMask =
918        APInt::getAllOnesValue(TD->getTypeAllocSizeInBits(Op->getType()));
919
920      SmallString<40> S;
921      ptrMask.toStringUnsigned(S);
922      O << ") & " << S.str() << ')';
923      break;
924    }
925    case Instruction::Add:
926    case Instruction::Sub:
927    case Instruction::And:
928    case Instruction::Or:
929    case Instruction::Xor:
930      O << '(';
931      EmitConstantValueOnly(CE->getOperand(0));
932      O << ')';
933      switch (Opcode) {
934      case Instruction::Add:
935       O << " + ";
936       break;
937      case Instruction::Sub:
938       O << " - ";
939       break;
940      case Instruction::And:
941       O << " & ";
942       break;
943      case Instruction::Or:
944       O << " | ";
945       break;
946      case Instruction::Xor:
947       O << " ^ ";
948       break;
949      default:
950       break;
951      }
952      O << '(';
953      EmitConstantValueOnly(CE->getOperand(1));
954      O << ')';
955      break;
956    default:
957      llvm_unreachable("Unsupported operator!");
958    }
959  } else {
960    llvm_unreachable("Unknown constant value!");
961  }
962}
963
964/// printAsCString - Print the specified array as a C compatible string, only if
965/// the predicate isString is true.
966///
967static void printAsCString(formatted_raw_ostream &O, const ConstantArray *CVA,
968                           unsigned LastElt) {
969  assert(CVA->isString() && "Array is not string compatible!");
970
971  O << '\"';
972  for (unsigned i = 0; i != LastElt; ++i) {
973    unsigned char C =
974        (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
975    printStringChar(O, C);
976  }
977  O << '\"';
978}
979
980/// EmitString - Emit a zero-byte-terminated string constant.
981///
982void AsmPrinter::EmitString(const ConstantArray *CVA) const {
983  unsigned NumElts = CVA->getNumOperands();
984  if (MAI->getAscizDirective() && NumElts &&
985      cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
986    O << MAI->getAscizDirective();
987    printAsCString(O, CVA, NumElts-1);
988  } else {
989    O << MAI->getAsciiDirective();
990    printAsCString(O, CVA, NumElts);
991  }
992  O << '\n';
993}
994
995void AsmPrinter::EmitGlobalConstantArray(const ConstantArray *CVA,
996                                         unsigned AddrSpace) {
997  if (CVA->isString()) {
998    EmitString(CVA);
999  } else { // Not a string.  Print the values in successive locations
1000    for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
1001      EmitGlobalConstant(CVA->getOperand(i), AddrSpace);
1002  }
1003}
1004
1005void AsmPrinter::EmitGlobalConstantVector(const ConstantVector *CP) {
1006  const VectorType *PTy = CP->getType();
1007
1008  for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
1009    EmitGlobalConstant(CP->getOperand(I));
1010}
1011
1012void AsmPrinter::EmitGlobalConstantStruct(const ConstantStruct *CVS,
1013                                          unsigned AddrSpace) {
1014  // Print the fields in successive locations. Pad to align if needed!
1015  const TargetData *TD = TM.getTargetData();
1016  unsigned Size = TD->getTypeAllocSize(CVS->getType());
1017  const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
1018  uint64_t sizeSoFar = 0;
1019  for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
1020    const Constant* field = CVS->getOperand(i);
1021
1022    // Check if padding is needed and insert one or more 0s.
1023    uint64_t fieldSize = TD->getTypeAllocSize(field->getType());
1024    uint64_t padSize = ((i == e-1 ? Size : cvsLayout->getElementOffset(i+1))
1025                        - cvsLayout->getElementOffset(i)) - fieldSize;
1026    sizeSoFar += fieldSize + padSize;
1027
1028    // Now print the actual field value.
1029    EmitGlobalConstant(field, AddrSpace);
1030
1031    // Insert padding - this may include padding to increase the size of the
1032    // current field up to the ABI size (if the struct is not packed) as well
1033    // as padding to ensure that the next field starts at the right offset.
1034    EmitZeros(padSize, AddrSpace);
1035  }
1036  assert(sizeSoFar == cvsLayout->getSizeInBytes() &&
1037         "Layout of constant struct may be incorrect!");
1038}
1039
1040void AsmPrinter::EmitGlobalConstantFP(const ConstantFP *CFP,
1041                                      unsigned AddrSpace) {
1042  // FP Constants are printed as integer constants to avoid losing
1043  // precision...
1044  LLVMContext &Context = CFP->getContext();
1045  const TargetData *TD = TM.getTargetData();
1046  if (CFP->getType() == Type::getDoubleTy(Context)) {
1047    double Val = CFP->getValueAPF().convertToDouble();  // for comment only
1048    uint64_t i = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1049    if (MAI->getData64bitsDirective(AddrSpace)) {
1050      O << MAI->getData64bitsDirective(AddrSpace) << i;
1051      if (VerboseAsm) {
1052        O.PadToColumn(MAI->getCommentColumn());
1053        O << MAI->getCommentString() << " double " << Val;
1054      }
1055      O << '\n';
1056    } else if (TD->isBigEndian()) {
1057      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1058      if (VerboseAsm) {
1059        O.PadToColumn(MAI->getCommentColumn());
1060        O << MAI->getCommentString()
1061          << " most significant word of double " << Val;
1062      }
1063      O << '\n';
1064      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1065      if (VerboseAsm) {
1066        O.PadToColumn(MAI->getCommentColumn());
1067        O << MAI->getCommentString()
1068          << " least significant word of double " << Val;
1069      }
1070      O << '\n';
1071    } else {
1072      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1073      if (VerboseAsm) {
1074        O.PadToColumn(MAI->getCommentColumn());
1075        O << MAI->getCommentString()
1076          << " least significant word of double " << Val;
1077      }
1078      O << '\n';
1079      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1080      if (VerboseAsm) {
1081        O.PadToColumn(MAI->getCommentColumn());
1082        O << MAI->getCommentString()
1083          << " most significant word of double " << Val;
1084      }
1085      O << '\n';
1086    }
1087    return;
1088  } else if (CFP->getType() == Type::getFloatTy(Context)) {
1089    float Val = CFP->getValueAPF().convertToFloat();  // for comment only
1090    O << MAI->getData32bitsDirective(AddrSpace)
1091      << CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1092    if (VerboseAsm) {
1093      O.PadToColumn(MAI->getCommentColumn());
1094      O << MAI->getCommentString() << " float " << Val;
1095    }
1096    O << '\n';
1097    return;
1098  } else if (CFP->getType() == Type::getX86_FP80Ty(Context)) {
1099    // all long double variants are printed as hex
1100    // api needed to prevent premature destruction
1101    APInt api = CFP->getValueAPF().bitcastToAPInt();
1102    const uint64_t *p = api.getRawData();
1103    // Convert to double so we can print the approximate val as a comment.
1104    APFloat DoubleVal = CFP->getValueAPF();
1105    bool ignored;
1106    DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1107                      &ignored);
1108    if (TD->isBigEndian()) {
1109      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1110      if (VerboseAsm) {
1111        O.PadToColumn(MAI->getCommentColumn());
1112        O << MAI->getCommentString()
1113          << " most significant halfword of x86_fp80 ~"
1114          << DoubleVal.convertToDouble();
1115      }
1116      O << '\n';
1117      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1118      if (VerboseAsm) {
1119        O.PadToColumn(MAI->getCommentColumn());
1120        O << MAI->getCommentString() << " next halfword";
1121      }
1122      O << '\n';
1123      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1124      if (VerboseAsm) {
1125        O.PadToColumn(MAI->getCommentColumn());
1126        O << MAI->getCommentString() << " next halfword";
1127      }
1128      O << '\n';
1129      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1130      if (VerboseAsm) {
1131        O.PadToColumn(MAI->getCommentColumn());
1132        O << MAI->getCommentString() << " next halfword";
1133      }
1134      O << '\n';
1135      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1136      if (VerboseAsm) {
1137        O.PadToColumn(MAI->getCommentColumn());
1138        O << MAI->getCommentString()
1139          << " least significant halfword";
1140      }
1141      O << '\n';
1142     } else {
1143      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1144      if (VerboseAsm) {
1145        O.PadToColumn(MAI->getCommentColumn());
1146        O << MAI->getCommentString()
1147          << " least significant halfword of x86_fp80 ~"
1148          << DoubleVal.convertToDouble();
1149      }
1150      O << '\n';
1151      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1152      if (VerboseAsm) {
1153        O.PadToColumn(MAI->getCommentColumn());
1154        O << MAI->getCommentString()
1155          << " next halfword";
1156      }
1157      O << '\n';
1158      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1159      if (VerboseAsm) {
1160        O.PadToColumn(MAI->getCommentColumn());
1161        O << MAI->getCommentString()
1162          << " next halfword";
1163      }
1164      O << '\n';
1165      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1166      if (VerboseAsm) {
1167        O.PadToColumn(MAI->getCommentColumn());
1168        O << MAI->getCommentString()
1169          << " next halfword";
1170      }
1171      O << '\n';
1172      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1173      if (VerboseAsm) {
1174        O.PadToColumn(MAI->getCommentColumn());
1175        O << MAI->getCommentString()
1176          << " most significant halfword";
1177      }
1178      O << '\n';
1179    }
1180    EmitZeros(TD->getTypeAllocSize(Type::getX86_FP80Ty(Context)) -
1181              TD->getTypeStoreSize(Type::getX86_FP80Ty(Context)), AddrSpace);
1182    return;
1183  } else if (CFP->getType() == Type::getPPC_FP128Ty(Context)) {
1184    // all long double variants are printed as hex
1185    // api needed to prevent premature destruction
1186    APInt api = CFP->getValueAPF().bitcastToAPInt();
1187    const uint64_t *p = api.getRawData();
1188    if (TD->isBigEndian()) {
1189      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1190      if (VerboseAsm) {
1191        O.PadToColumn(MAI->getCommentColumn());
1192        O << MAI->getCommentString()
1193          << " most significant word of ppc_fp128";
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[1] >> 32);
1204      if (VerboseAsm) {
1205        O.PadToColumn(MAI->getCommentColumn());
1206        O << MAI->getCommentString()
1207          << " next word";
1208      }
1209      O << '\n';
1210      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
1211      if (VerboseAsm) {
1212        O.PadToColumn(MAI->getCommentColumn());
1213        O << MAI->getCommentString()
1214          << " least significant word";
1215      }
1216      O << '\n';
1217     } else {
1218      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
1219      if (VerboseAsm) {
1220        O.PadToColumn(MAI->getCommentColumn());
1221        O << MAI->getCommentString()
1222          << " least significant word of ppc_fp128";
1223      }
1224      O << '\n';
1225      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1226      if (VerboseAsm) {
1227        O.PadToColumn(MAI->getCommentColumn());
1228        O << MAI->getCommentString()
1229          << " next word";
1230      }
1231      O << '\n';
1232      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1233      if (VerboseAsm) {
1234        O.PadToColumn(MAI->getCommentColumn());
1235        O << MAI->getCommentString()
1236          << " next word";
1237      }
1238      O << '\n';
1239      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1240      if (VerboseAsm) {
1241        O.PadToColumn(MAI->getCommentColumn());
1242        O << MAI->getCommentString()
1243          << " most significant word";
1244      }
1245      O << '\n';
1246    }
1247    return;
1248  } else llvm_unreachable("Floating point constant type not handled");
1249}
1250
1251void AsmPrinter::EmitGlobalConstantLargeInt(const ConstantInt *CI,
1252                                            unsigned AddrSpace) {
1253  const TargetData *TD = TM.getTargetData();
1254  unsigned BitWidth = CI->getBitWidth();
1255  assert(isPowerOf2_32(BitWidth) &&
1256         "Non-power-of-2-sized integers not handled!");
1257
1258  // We don't expect assemblers to support integer data directives
1259  // for more than 64 bits, so we emit the data in at most 64-bit
1260  // quantities at a time.
1261  const uint64_t *RawData = CI->getValue().getRawData();
1262  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1263    uint64_t Val;
1264    if (TD->isBigEndian())
1265      Val = RawData[e - i - 1];
1266    else
1267      Val = RawData[i];
1268
1269    if (MAI->getData64bitsDirective(AddrSpace))
1270      O << MAI->getData64bitsDirective(AddrSpace) << Val << '\n';
1271    else if (TD->isBigEndian()) {
1272      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32);
1273      if (VerboseAsm) {
1274        O.PadToColumn(MAI->getCommentColumn());
1275        O << MAI->getCommentString()
1276          << " most significant half of i64 " << Val;
1277      }
1278      O << '\n';
1279      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(Val);
1280      if (VerboseAsm) {
1281        O.PadToColumn(MAI->getCommentColumn());
1282        O << MAI->getCommentString()
1283          << " least significant half of i64 " << Val;
1284      }
1285      O << '\n';
1286    } else {
1287      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(Val);
1288      if (VerboseAsm) {
1289        O.PadToColumn(MAI->getCommentColumn());
1290        O << MAI->getCommentString()
1291          << " least significant half of i64 " << Val;
1292      }
1293      O << '\n';
1294      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32);
1295      if (VerboseAsm) {
1296        O.PadToColumn(MAI->getCommentColumn());
1297        O << MAI->getCommentString()
1298          << " most significant half of i64 " << Val;
1299      }
1300      O << '\n';
1301    }
1302  }
1303}
1304
1305/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1306void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1307  const TargetData *TD = TM.getTargetData();
1308  const Type *type = CV->getType();
1309  unsigned Size = TD->getTypeAllocSize(type);
1310
1311  if (CV->isNullValue() || isa<UndefValue>(CV)) {
1312    EmitZeros(Size, AddrSpace);
1313    return;
1314  } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
1315    EmitGlobalConstantArray(CVA , AddrSpace);
1316    return;
1317  } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
1318    EmitGlobalConstantStruct(CVS, AddrSpace);
1319    return;
1320  } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
1321    EmitGlobalConstantFP(CFP, AddrSpace);
1322    return;
1323  } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1324    // Small integers are handled below; large integers are handled here.
1325    if (Size > 4) {
1326      EmitGlobalConstantLargeInt(CI, AddrSpace);
1327      return;
1328    }
1329  } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) {
1330    EmitGlobalConstantVector(CP);
1331    return;
1332  }
1333
1334  printDataDirective(type, AddrSpace);
1335  EmitConstantValueOnly(CV);
1336  if (VerboseAsm) {
1337    if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1338      SmallString<40> S;
1339      CI->getValue().toStringUnsigned(S, 16);
1340      O.PadToColumn(MAI->getCommentColumn());
1341      O << MAI->getCommentString() << " 0x" << S.str();
1342    }
1343  }
1344  O << '\n';
1345}
1346
1347void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1348  // Target doesn't support this yet!
1349  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1350}
1351
1352/// PrintSpecial - Print information related to the specified machine instr
1353/// that is independent of the operand, and may be independent of the instr
1354/// itself.  This can be useful for portably encoding the comment character
1355/// or other bits of target-specific knowledge into the asmstrings.  The
1356/// syntax used is ${:comment}.  Targets can override this to add support
1357/// for their own strange codes.
1358void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1359  if (!strcmp(Code, "private")) {
1360    O << MAI->getPrivateGlobalPrefix();
1361  } else if (!strcmp(Code, "comment")) {
1362    if (VerboseAsm)
1363      O << MAI->getCommentString();
1364  } else if (!strcmp(Code, "uid")) {
1365    // Comparing the address of MI isn't sufficient, because machineinstrs may
1366    // be allocated to the same address across functions.
1367    const Function *ThisF = MI->getParent()->getParent()->getFunction();
1368
1369    // If this is a new LastFn instruction, bump the counter.
1370    if (LastMI != MI || LastFn != ThisF) {
1371      ++Counter;
1372      LastMI = MI;
1373      LastFn = ThisF;
1374    }
1375    O << Counter;
1376  } else {
1377    std::string msg;
1378    raw_string_ostream Msg(msg);
1379    Msg << "Unknown special formatter '" << Code
1380         << "' for machine instr: " << *MI;
1381    llvm_report_error(Msg.str());
1382  }
1383}
1384
1385/// processDebugLoc - Processes the debug information of each machine
1386/// instruction's DebugLoc.
1387void AsmPrinter::processDebugLoc(DebugLoc DL) {
1388  if (!MAI || !DW)
1389    return;
1390
1391  if (MAI->doesSupportDebugInformation() && DW->ShouldEmitDwarfDebug()) {
1392    if (!DL.isUnknown()) {
1393      DebugLocTuple CurDLT = MF->getDebugLocTuple(DL);
1394
1395      if (CurDLT.CompileUnit != 0 && PrevDLT != CurDLT) {
1396        printLabel(DW->RecordSourceLine(CurDLT.Line, CurDLT.Col,
1397                                        DICompileUnit(CurDLT.CompileUnit)));
1398        O << '\n';
1399      }
1400
1401      PrevDLT = CurDLT;
1402    }
1403  }
1404}
1405
1406/// printInlineAsm - This method formats and prints the specified machine
1407/// instruction that is an inline asm.
1408void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1409  unsigned NumOperands = MI->getNumOperands();
1410
1411  // Count the number of register definitions.
1412  unsigned NumDefs = 0;
1413  for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1414       ++NumDefs)
1415    assert(NumDefs != NumOperands-1 && "No asm string?");
1416
1417  assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1418
1419  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1420  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1421
1422  // If this asmstr is empty, just print the #APP/#NOAPP markers.
1423  // These are useful to see where empty asm's wound up.
1424  if (AsmStr[0] == 0) {
1425    O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1426    O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
1427    return;
1428  }
1429
1430  O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1431
1432  // The variant of the current asmprinter.
1433  int AsmPrinterVariant = MAI->getAssemblerDialect();
1434
1435  int CurVariant = -1;            // The number of the {.|.|.} region we are in.
1436  const char *LastEmitted = AsmStr; // One past the last character emitted.
1437
1438  while (*LastEmitted) {
1439    switch (*LastEmitted) {
1440    default: {
1441      // Not a special case, emit the string section literally.
1442      const char *LiteralEnd = LastEmitted+1;
1443      while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1444             *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1445        ++LiteralEnd;
1446      if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1447        O.write(LastEmitted, LiteralEnd-LastEmitted);
1448      LastEmitted = LiteralEnd;
1449      break;
1450    }
1451    case '\n':
1452      ++LastEmitted;   // Consume newline character.
1453      O << '\n';       // Indent code with newline.
1454      break;
1455    case '$': {
1456      ++LastEmitted;   // Consume '$' character.
1457      bool Done = true;
1458
1459      // Handle escapes.
1460      switch (*LastEmitted) {
1461      default: Done = false; break;
1462      case '$':     // $$ -> $
1463        if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1464          O << '$';
1465        ++LastEmitted;  // Consume second '$' character.
1466        break;
1467      case '(':             // $( -> same as GCC's { character.
1468        ++LastEmitted;      // Consume '(' character.
1469        if (CurVariant != -1) {
1470          llvm_report_error("Nested variants found in inline asm string: '"
1471                            + std::string(AsmStr) + "'");
1472        }
1473        CurVariant = 0;     // We're in the first variant now.
1474        break;
1475      case '|':
1476        ++LastEmitted;  // consume '|' character.
1477        if (CurVariant == -1)
1478          O << '|';       // this is gcc's behavior for | outside a variant
1479        else
1480          ++CurVariant;   // We're in the next variant.
1481        break;
1482      case ')':         // $) -> same as GCC's } char.
1483        ++LastEmitted;  // consume ')' character.
1484        if (CurVariant == -1)
1485          O << '}';     // this is gcc's behavior for } outside a variant
1486        else
1487          CurVariant = -1;
1488        break;
1489      }
1490      if (Done) break;
1491
1492      bool HasCurlyBraces = false;
1493      if (*LastEmitted == '{') {     // ${variable}
1494        ++LastEmitted;               // Consume '{' character.
1495        HasCurlyBraces = true;
1496      }
1497
1498      // If we have ${:foo}, then this is not a real operand reference, it is a
1499      // "magic" string reference, just like in .td files.  Arrange to call
1500      // PrintSpecial.
1501      if (HasCurlyBraces && *LastEmitted == ':') {
1502        ++LastEmitted;
1503        const char *StrStart = LastEmitted;
1504        const char *StrEnd = strchr(StrStart, '}');
1505        if (StrEnd == 0) {
1506          llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1507                            + std::string(AsmStr) + "'");
1508        }
1509
1510        std::string Val(StrStart, StrEnd);
1511        PrintSpecial(MI, Val.c_str());
1512        LastEmitted = StrEnd+1;
1513        break;
1514      }
1515
1516      const char *IDStart = LastEmitted;
1517      char *IDEnd;
1518      errno = 0;
1519      long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1520      if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1521        llvm_report_error("Bad $ operand number in inline asm string: '"
1522                          + std::string(AsmStr) + "'");
1523      }
1524      LastEmitted = IDEnd;
1525
1526      char Modifier[2] = { 0, 0 };
1527
1528      if (HasCurlyBraces) {
1529        // If we have curly braces, check for a modifier character.  This
1530        // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1531        if (*LastEmitted == ':') {
1532          ++LastEmitted;    // Consume ':' character.
1533          if (*LastEmitted == 0) {
1534            llvm_report_error("Bad ${:} expression in inline asm string: '"
1535                              + std::string(AsmStr) + "'");
1536          }
1537
1538          Modifier[0] = *LastEmitted;
1539          ++LastEmitted;    // Consume modifier character.
1540        }
1541
1542        if (*LastEmitted != '}') {
1543          llvm_report_error("Bad ${} expression in inline asm string: '"
1544                            + std::string(AsmStr) + "'");
1545        }
1546        ++LastEmitted;    // Consume '}' character.
1547      }
1548
1549      if ((unsigned)Val >= NumOperands-1) {
1550        llvm_report_error("Invalid $ operand number in inline asm string: '"
1551                          + std::string(AsmStr) + "'");
1552      }
1553
1554      // Okay, we finally have a value number.  Ask the target to print this
1555      // operand!
1556      if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1557        unsigned OpNo = 1;
1558
1559        bool Error = false;
1560
1561        // Scan to find the machine operand number for the operand.
1562        for (; Val; --Val) {
1563          if (OpNo >= MI->getNumOperands()) break;
1564          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1565          OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1566        }
1567
1568        if (OpNo >= MI->getNumOperands()) {
1569          Error = true;
1570        } else {
1571          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1572          ++OpNo;  // Skip over the ID number.
1573
1574          if (Modifier[0]=='l')  // labels are target independent
1575            GetMBBSymbol(MI->getOperand(OpNo).getMBB()
1576                           ->getNumber())->print(O, MAI);
1577          else {
1578            AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1579            if ((OpFlags & 7) == 4) {
1580              Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1581                                                Modifier[0] ? Modifier : 0);
1582            } else {
1583              Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1584                                          Modifier[0] ? Modifier : 0);
1585            }
1586          }
1587        }
1588        if (Error) {
1589          std::string msg;
1590          raw_string_ostream Msg(msg);
1591          Msg << "Invalid operand found in inline asm: '"
1592               << AsmStr << "'\n";
1593          MI->print(Msg);
1594          llvm_report_error(Msg.str());
1595        }
1596      }
1597      break;
1598    }
1599    }
1600  }
1601  O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd();
1602}
1603
1604/// printImplicitDef - This method prints the specified machine instruction
1605/// that is an implicit def.
1606void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1607  if (!VerboseAsm) return;
1608  O.PadToColumn(MAI->getCommentColumn());
1609  O << MAI->getCommentString() << " implicit-def: "
1610    << TRI->getName(MI->getOperand(0).getReg());
1611}
1612
1613/// printLabel - This method prints a local label used by debug and
1614/// exception handling tables.
1615void AsmPrinter::printLabel(const MachineInstr *MI) const {
1616  printLabel(MI->getOperand(0).getImm());
1617}
1618
1619void AsmPrinter::printLabel(unsigned Id) const {
1620  O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':';
1621}
1622
1623/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1624/// instruction, using the specified assembler variant.  Targets should
1625/// overried this to format as appropriate.
1626bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1627                                 unsigned AsmVariant, const char *ExtraCode) {
1628  // Target doesn't support this yet!
1629  return true;
1630}
1631
1632bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1633                                       unsigned AsmVariant,
1634                                       const char *ExtraCode) {
1635  // Target doesn't support this yet!
1636  return true;
1637}
1638
1639MCSymbol *AsmPrinter::GetMBBSymbol(unsigned MBBID) const {
1640  SmallString<60> Name;
1641  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "BB"
1642    << getFunctionNumber() << '_' << MBBID;
1643
1644  return OutContext.GetOrCreateSymbol(Name.str());
1645}
1646
1647
1648/// EmitBasicBlockStart - This method prints the label for the specified
1649/// MachineBasicBlock, an alignment (if present) and a comment describing
1650/// it if appropriate.
1651void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
1652  if (unsigned Align = MBB->getAlignment())
1653    EmitAlignment(Log2_32(Align));
1654
1655  GetMBBSymbol(MBB->getNumber())->print(O, MAI);
1656  O << ':';
1657
1658  if (VerboseAsm) {
1659    if (const BasicBlock *BB = MBB->getBasicBlock())
1660      if (BB->hasName()) {
1661        O.PadToColumn(MAI->getCommentColumn());
1662        O << MAI->getCommentString() << ' ';
1663        WriteAsOperand(O, BB, /*PrintType=*/false);
1664      }
1665
1666    EmitComments(*MBB);
1667  }
1668}
1669
1670/// printPICJumpTableSetLabel - This method prints a set label for the
1671/// specified MachineBasicBlock for a jumptable entry.
1672void AsmPrinter::printPICJumpTableSetLabel(unsigned uid,
1673                                           const MachineBasicBlock *MBB) const {
1674  if (!MAI->getSetDirective())
1675    return;
1676
1677  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1678    << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
1679  GetMBBSymbol(MBB->getNumber())->print(O, MAI);
1680  O << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1681    << '_' << uid << '\n';
1682}
1683
1684void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
1685                                           const MachineBasicBlock *MBB) const {
1686  if (!MAI->getSetDirective())
1687    return;
1688
1689  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1690    << getFunctionNumber() << '_' << uid << '_' << uid2
1691    << "_set_" << MBB->getNumber() << ',';
1692  GetMBBSymbol(MBB->getNumber())->print(O, MAI);
1693  O << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1694    << '_' << uid << '_' << uid2 << '\n';
1695}
1696
1697/// printDataDirective - This method prints the asm directive for the
1698/// specified type.
1699void AsmPrinter::printDataDirective(const Type *type, unsigned AddrSpace) {
1700  const TargetData *TD = TM.getTargetData();
1701  switch (type->getTypeID()) {
1702  case Type::FloatTyID: case Type::DoubleTyID:
1703  case Type::X86_FP80TyID: case Type::FP128TyID: case Type::PPC_FP128TyID:
1704    assert(0 && "Should have already output floating point constant.");
1705  default:
1706    assert(0 && "Can't handle printing this type of thing");
1707  case Type::IntegerTyID: {
1708    unsigned BitWidth = cast<IntegerType>(type)->getBitWidth();
1709    if (BitWidth <= 8)
1710      O << MAI->getData8bitsDirective(AddrSpace);
1711    else if (BitWidth <= 16)
1712      O << MAI->getData16bitsDirective(AddrSpace);
1713    else if (BitWidth <= 32)
1714      O << MAI->getData32bitsDirective(AddrSpace);
1715    else if (BitWidth <= 64) {
1716      assert(MAI->getData64bitsDirective(AddrSpace) &&
1717             "Target cannot handle 64-bit constant exprs!");
1718      O << MAI->getData64bitsDirective(AddrSpace);
1719    } else {
1720      llvm_unreachable("Target cannot handle given data directive width!");
1721    }
1722    break;
1723  }
1724  case Type::PointerTyID:
1725    if (TD->getPointerSize() == 8) {
1726      assert(MAI->getData64bitsDirective(AddrSpace) &&
1727             "Target cannot handle 64-bit pointer exprs!");
1728      O << MAI->getData64bitsDirective(AddrSpace);
1729    } else if (TD->getPointerSize() == 2) {
1730      O << MAI->getData16bitsDirective(AddrSpace);
1731    } else if (TD->getPointerSize() == 1) {
1732      O << MAI->getData8bitsDirective(AddrSpace);
1733    } else {
1734      O << MAI->getData32bitsDirective(AddrSpace);
1735    }
1736    break;
1737  }
1738}
1739
1740void AsmPrinter::printVisibility(const std::string& Name,
1741                                 unsigned Visibility) const {
1742  if (Visibility == GlobalValue::HiddenVisibility) {
1743    if (const char *Directive = MAI->getHiddenDirective())
1744      O << Directive << Name << '\n';
1745  } else if (Visibility == GlobalValue::ProtectedVisibility) {
1746    if (const char *Directive = MAI->getProtectedDirective())
1747      O << Directive << Name << '\n';
1748  }
1749}
1750
1751void AsmPrinter::printOffset(int64_t Offset) const {
1752  if (Offset > 0)
1753    O << '+' << Offset;
1754  else if (Offset < 0)
1755    O << Offset;
1756}
1757
1758void AsmPrinter::printMCInst(const MCInst *MI) {
1759  llvm_unreachable("MCInst printing unavailable on this target!");
1760}
1761
1762GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1763  if (!S->usesMetadata())
1764    return 0;
1765
1766  gcp_iterator GCPI = GCMetadataPrinters.find(S);
1767  if (GCPI != GCMetadataPrinters.end())
1768    return GCPI->second;
1769
1770  const char *Name = S->getName().c_str();
1771
1772  for (GCMetadataPrinterRegistry::iterator
1773         I = GCMetadataPrinterRegistry::begin(),
1774         E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1775    if (strcmp(Name, I->getName()) == 0) {
1776      GCMetadataPrinter *GMP = I->instantiate();
1777      GMP->S = S;
1778      GCMetadataPrinters.insert(std::make_pair(S, GMP));
1779      return GMP;
1780    }
1781
1782  errs() << "no GCMetadataPrinter registered for GC: " << Name << "\n";
1783  llvm_unreachable(0);
1784}
1785
1786/// EmitComments - Pretty-print comments for instructions
1787void AsmPrinter::EmitComments(const MachineInstr &MI) const {
1788  assert(VerboseAsm && !MI.getDebugLoc().isUnknown());
1789
1790  DebugLocTuple DLT = MF->getDebugLocTuple(MI.getDebugLoc());
1791
1792  // Print source line info.
1793  O.PadToColumn(MAI->getCommentColumn());
1794  O << MAI->getCommentString() << " SrcLine ";
1795  if (DLT.CompileUnit) {
1796    std::string Str;
1797    DICompileUnit CU(DLT.CompileUnit);
1798    O << CU.getFilename(Str) << " ";
1799  }
1800  O << DLT.Line;
1801  if (DLT.Col != 0)
1802    O << ":" << DLT.Col;
1803}
1804
1805/// PrintChildLoopComment - Print comments about child loops within
1806/// the loop for this basic block, with nesting.
1807///
1808static void PrintChildLoopComment(formatted_raw_ostream &O,
1809                                  const MachineLoop *loop,
1810                                  const MCAsmInfo *MAI,
1811                                  int FunctionNumber) {
1812  // Add child loop information
1813  for(MachineLoop::iterator cl = loop->begin(),
1814        clend = loop->end();
1815      cl != clend;
1816      ++cl) {
1817    MachineBasicBlock *Header = (*cl)->getHeader();
1818    assert(Header && "No header for loop");
1819
1820    O << '\n';
1821    O.PadToColumn(MAI->getCommentColumn());
1822
1823    O << MAI->getCommentString();
1824    O.indent(((*cl)->getLoopDepth()-1)*2)
1825      << " Child Loop BB" << FunctionNumber << "_"
1826      << Header->getNumber() << " Depth " << (*cl)->getLoopDepth();
1827
1828    PrintChildLoopComment(O, *cl, MAI, FunctionNumber);
1829  }
1830}
1831
1832/// EmitComments - Pretty-print comments for basic blocks
1833void AsmPrinter::EmitComments(const MachineBasicBlock &MBB) const
1834{
1835  if (VerboseAsm) {
1836    // Add loop depth information
1837    const MachineLoop *loop = LI->getLoopFor(&MBB);
1838
1839    if (loop) {
1840      // Print a newline after bb# annotation.
1841      O << "\n";
1842      O.PadToColumn(MAI->getCommentColumn());
1843      O << MAI->getCommentString() << " Loop Depth " << loop->getLoopDepth()
1844        << '\n';
1845
1846      O.PadToColumn(MAI->getCommentColumn());
1847
1848      MachineBasicBlock *Header = loop->getHeader();
1849      assert(Header && "No header for loop");
1850
1851      if (Header == &MBB) {
1852        O << MAI->getCommentString() << " Loop Header";
1853        PrintChildLoopComment(O, loop, MAI, getFunctionNumber());
1854      }
1855      else {
1856        O << MAI->getCommentString() << " Loop Header is BB"
1857          << getFunctionNumber() << "_" << loop->getHeader()->getNumber();
1858      }
1859
1860      if (loop->empty()) {
1861        O << '\n';
1862        O.PadToColumn(MAI->getCommentColumn());
1863        O << MAI->getCommentString() << " Inner Loop";
1864      }
1865
1866      // Add parent loop information
1867      for (const MachineLoop *CurLoop = loop->getParentLoop();
1868           CurLoop;
1869           CurLoop = CurLoop->getParentLoop()) {
1870        MachineBasicBlock *Header = CurLoop->getHeader();
1871        assert(Header && "No header for loop");
1872
1873        O << '\n';
1874        O.PadToColumn(MAI->getCommentColumn());
1875        O << MAI->getCommentString();
1876        O.indent((CurLoop->getLoopDepth()-1)*2)
1877          << " Inside Loop BB" << getFunctionNumber() << "_"
1878          << Header->getNumber() << " Depth " << CurLoop->getLoopDepth();
1879      }
1880    }
1881  }
1882}
1883