AsmPrinter.cpp revision a71dc60dc2bb5a154d9195dfe2d3126f7c7967d5 
1//===-- AsmPrinter.cpp - Common AsmPrinter code ---------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file implements the AsmPrinter class.
11//
12//===----------------------------------------------------------------------===//
13
14#include "llvm/CodeGen/AsmPrinter.h"
15#include "llvm/Assembly/Writer.h"
16#include "llvm/DerivedTypes.h"
17#include "llvm/Constants.h"
18#include "llvm/Module.h"
19#include "llvm/CodeGen/DwarfWriter.h"
20#include "llvm/CodeGen/GCMetadataPrinter.h"
21#include "llvm/CodeGen/MachineConstantPool.h"
22#include "llvm/CodeGen/MachineFrameInfo.h"
23#include "llvm/CodeGen/MachineFunction.h"
24#include "llvm/CodeGen/MachineJumpTableInfo.h"
25#include "llvm/CodeGen/MachineLoopInfo.h"
26#include "llvm/CodeGen/MachineModuleInfo.h"
27#include "llvm/Analysis/DebugInfo.h"
28#include "llvm/MC/MCContext.h"
29#include "llvm/MC/MCInst.h"
30#include "llvm/MC/MCSection.h"
31#include "llvm/MC/MCStreamer.h"
32#include "llvm/MC/MCSymbol.h"
33#include "llvm/Support/CommandLine.h"
34#include "llvm/Support/ErrorHandling.h"
35#include "llvm/Support/FormattedStream.h"
36#include "llvm/MC/MCAsmInfo.h"
37#include "llvm/Target/Mangler.h"
38#include "llvm/Target/TargetData.h"
39#include "llvm/Target/TargetInstrInfo.h"
40#include "llvm/Target/TargetLowering.h"
41#include "llvm/Target/TargetLoweringObjectFile.h"
42#include "llvm/Target/TargetOptions.h"
43#include "llvm/Target/TargetRegisterInfo.h"
44#include "llvm/ADT/SmallPtrSet.h"
45#include "llvm/ADT/SmallString.h"
46#include <cerrno>
47using namespace llvm;
48
49static cl::opt<cl::boolOrDefault>
50AsmVerbose("asm-verbose", cl::desc("Add comments to directives."),
51           cl::init(cl::BOU_UNSET));
52
53char AsmPrinter::ID = 0;
54AsmPrinter::AsmPrinter(formatted_raw_ostream &o, TargetMachine &tm,
55                       const MCAsmInfo *T, bool VDef)
56  : MachineFunctionPass(&ID), FunctionNumber(0), O(o),
57    TM(tm), MAI(T), TRI(tm.getRegisterInfo()),
58
59    OutContext(*new MCContext()),
60    // FIXME: Pass instprinter to streamer.
61    OutStreamer(*createAsmStreamer(OutContext, O, *T, 0)),
62
63    LastMI(0), LastFn(0), Counter(~0U), PrevDLT(NULL) {
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(*MAI);
105
106  // Allow the target to emit any magic that it wants at the start of the file.
107  EmitStartOfAsmFile(M);
108
109  if (MAI->hasSingleParameterDotFile()) {
110    /* Very minimal debug info. It is ignored if we emit actual
111       debug info. If we don't, this at least helps the user find where
112       a function came from. */
113    O << "\t.file\t\"" << M.getModuleIdentifier() << "\"\n";
114  }
115
116  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
117  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
118  for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
119    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
120      MP->beginAssembly(O, *this, *MAI);
121
122  if (!M.getModuleInlineAsm().empty())
123    O << MAI->getCommentString() << " Start of file scope inline assembly\n"
124      << M.getModuleInlineAsm()
125      << '\n' << MAI->getCommentString()
126      << " End of file scope inline assembly\n";
127
128  MMI = getAnalysisIfAvailable<MachineModuleInfo>();
129  if (MMI)
130    MMI->AnalyzeModule(M);
131  DW = getAnalysisIfAvailable<DwarfWriter>();
132  if (DW)
133    DW->BeginModule(&M, MMI, O, this, MAI);
134
135  return false;
136}
137
138/// EmitGlobalVariable - Emit the specified global variable to the .s file.
139void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
140  if (!GV->hasInitializer())   // External globals require no code.
141    return;
142
143  // Check to see if this is a special global used by LLVM, if so, emit it.
144  if (EmitSpecialLLVMGlobal(GV))
145    return;
146
147  MCSymbol *GVSym = GetGlobalValueSymbol(GV);
148  printVisibility(GVSym, GV->getVisibility());
149
150  if (MAI->hasDotTypeDotSizeDirective()) {
151    O << "\t.type\t" << *GVSym;
152    if (MAI->getCommentString()[0] != '@')
153      O << ",@object\n";
154    else
155      O << ",%object\n";
156  }
157
158  SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
159
160  const TargetData *TD = TM.getTargetData();
161  unsigned Size = TD->getTypeAllocSize(GV->getType()->getElementType());
162  unsigned AlignLog = TD->getPreferredAlignmentLog(GV);
163
164  // Handle common and BSS local symbols (.lcomm).
165  if (GVKind.isCommon() || GVKind.isBSSLocal()) {
166    if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
167
168    if (VerboseAsm) {
169      O.PadToColumn(MAI->getCommentColumn());
170      O << MAI->getCommentString() << ' ';
171      WriteAsOperand(O, GV, /*PrintType=*/false, GV->getParent());
172      O << '\n';
173    }
174
175    // Handle common symbols.
176    if (GVKind.isCommon()) {
177      // .comm _foo, 42, 4
178      OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
179      return;
180    }
181
182    // Handle local BSS symbols.
183    if (MAI->hasMachoZeroFillDirective()) {
184      const MCSection *TheSection =
185        getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
186      // .zerofill __DATA, __bss, _foo, 400, 5
187      OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
188      return;
189    }
190
191    if (const char *LComm = MAI->getLCOMMDirective()) {
192      // .lcomm _foo, 42
193      O << LComm << *GVSym << ',' << Size;
194      O << '\n';
195      return;
196    }
197
198    // .local _foo
199    O << "\t.local\t" << *GVSym << '\n';
200    // .comm _foo, 42, 4
201    OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
202    return;
203  }
204
205  const MCSection *TheSection =
206    getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
207
208  // Handle the zerofill directive on darwin, which is a special form of BSS
209  // emission.
210  if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
211    // .globl _foo
212    OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
213    // .zerofill __DATA, __common, _foo, 400, 5
214    OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
215    return;
216  }
217
218  OutStreamer.SwitchSection(TheSection);
219
220  // TODO: Factor into an 'emit linkage' thing that is shared with function
221  // bodies.
222  switch (GV->getLinkage()) {
223  case GlobalValue::CommonLinkage:
224  case GlobalValue::LinkOnceAnyLinkage:
225  case GlobalValue::LinkOnceODRLinkage:
226  case GlobalValue::WeakAnyLinkage:
227  case GlobalValue::WeakODRLinkage:
228  case GlobalValue::LinkerPrivateLinkage:
229    if (MAI->getWeakDefDirective() != 0) {
230      // .globl _foo
231      OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
232      // .weak_definition _foo
233      OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::WeakDefinition);
234    } else if (const char *LinkOnce = MAI->getLinkOnceDirective()) {
235      // .globl _foo
236      OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
237      // .linkonce same_size
238      O << LinkOnce;
239    } else {
240      // .weak _foo
241      OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Weak);
242    }
243    break;
244  case GlobalValue::DLLExportLinkage:
245  case GlobalValue::AppendingLinkage:
246    // FIXME: appending linkage variables should go into a section of
247    // their name or something.  For now, just emit them as external.
248  case GlobalValue::ExternalLinkage:
249    // If external or appending, declare as a global symbol.
250    // .globl _foo
251    OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
252    break;
253  case GlobalValue::PrivateLinkage:
254  case GlobalValue::InternalLinkage:
255     break;
256  default:
257    llvm_unreachable("Unknown linkage type!");
258  }
259
260  EmitAlignment(AlignLog, GV);
261  if (VerboseAsm) {
262    O.PadToColumn(MAI->getCommentColumn());
263    O << MAI->getCommentString() << ' ';
264    WriteAsOperand(O, GV, /*PrintType=*/false, GV->getParent());
265    O << '\n';
266  }
267  OutStreamer.EmitLabel(GVSym);
268
269  EmitGlobalConstant(GV->getInitializer());
270
271  if (MAI->hasDotTypeDotSizeDirective())
272    O << "\t.size\t" << *GVSym << ", " << Size << '\n';
273}
274
275
276bool AsmPrinter::doFinalization(Module &M) {
277  // Emit global variables.
278  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
279       I != E; ++I)
280    EmitGlobalVariable(I);
281
282  // Emit final debug information.
283  if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
284    DW->EndModule();
285
286  // If the target wants to know about weak references, print them all.
287  if (MAI->getWeakRefDirective()) {
288    // FIXME: This is not lazy, it would be nice to only print weak references
289    // to stuff that is actually used.  Note that doing so would require targets
290    // to notice uses in operands (due to constant exprs etc).  This should
291    // happen with the MC stuff eventually.
292
293    // Print out module-level global variables here.
294    for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
295         I != E; ++I) {
296      if (!I->hasExternalWeakLinkage()) continue;
297      O << MAI->getWeakRefDirective() << *GetGlobalValueSymbol(I) << '\n';
298    }
299
300    for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
301      if (!I->hasExternalWeakLinkage()) continue;
302      O << MAI->getWeakRefDirective() << *GetGlobalValueSymbol(I) << '\n';
303    }
304  }
305
306  if (MAI->getSetDirective()) {
307    O << '\n';
308    for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
309         I != E; ++I) {
310      MCSymbol *Name = GetGlobalValueSymbol(I);
311
312      const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
313      MCSymbol *Target = GetGlobalValueSymbol(GV);
314
315      if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
316        O << "\t.globl\t" << *Name << '\n';
317      else if (I->hasWeakLinkage())
318        O << MAI->getWeakRefDirective() << *Name << '\n';
319      else
320        assert(I->hasLocalLinkage() && "Invalid alias linkage");
321
322      printVisibility(Name, I->getVisibility());
323
324      O << MAI->getSetDirective() << ' ' << *Name << ", " << *Target << '\n';
325    }
326  }
327
328  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
329  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
330  for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
331    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
332      MP->finishAssembly(O, *this, *MAI);
333
334  // If we don't have any trampolines, then we don't require stack memory
335  // to be executable. Some targets have a directive to declare this.
336  Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
337  if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
338    if (MAI->getNonexecutableStackDirective())
339      O << MAI->getNonexecutableStackDirective() << '\n';
340
341
342  // Allow the target to emit any magic that it wants at the end of the file,
343  // after everything else has gone out.
344  EmitEndOfAsmFile(M);
345
346  delete Mang; Mang = 0;
347  DW = 0; MMI = 0;
348
349  OutStreamer.Finish();
350  return false;
351}
352
353void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
354  // Get the function symbol.
355  CurrentFnSym = GetGlobalValueSymbol(MF.getFunction());
356  IncrementFunctionNumber();
357
358  if (VerboseAsm)
359    LI = &getAnalysis<MachineLoopInfo>();
360}
361
362namespace {
363  // SectionCPs - Keep track the alignment, constpool entries per Section.
364  struct SectionCPs {
365    const MCSection *S;
366    unsigned Alignment;
367    SmallVector<unsigned, 4> CPEs;
368    SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
369  };
370}
371
372/// EmitConstantPool - Print to the current output stream assembly
373/// representations of the constants in the constant pool MCP. This is
374/// used to print out constants which have been "spilled to memory" by
375/// the code generator.
376///
377void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
378  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
379  if (CP.empty()) return;
380
381  // Calculate sections for constant pool entries. We collect entries to go into
382  // the same section together to reduce amount of section switch statements.
383  SmallVector<SectionCPs, 4> CPSections;
384  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
385    const MachineConstantPoolEntry &CPE = CP[i];
386    unsigned Align = CPE.getAlignment();
387
388    SectionKind Kind;
389    switch (CPE.getRelocationInfo()) {
390    default: llvm_unreachable("Unknown section kind");
391    case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
392    case 1:
393      Kind = SectionKind::getReadOnlyWithRelLocal();
394      break;
395    case 0:
396    switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
397    case 4:  Kind = SectionKind::getMergeableConst4(); break;
398    case 8:  Kind = SectionKind::getMergeableConst8(); break;
399    case 16: Kind = SectionKind::getMergeableConst16();break;
400    default: Kind = SectionKind::getMergeableConst(); break;
401    }
402    }
403
404    const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
405
406    // The number of sections are small, just do a linear search from the
407    // last section to the first.
408    bool Found = false;
409    unsigned SecIdx = CPSections.size();
410    while (SecIdx != 0) {
411      if (CPSections[--SecIdx].S == S) {
412        Found = true;
413        break;
414      }
415    }
416    if (!Found) {
417      SecIdx = CPSections.size();
418      CPSections.push_back(SectionCPs(S, Align));
419    }
420
421    if (Align > CPSections[SecIdx].Alignment)
422      CPSections[SecIdx].Alignment = Align;
423    CPSections[SecIdx].CPEs.push_back(i);
424  }
425
426  // Now print stuff into the calculated sections.
427  for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
428    OutStreamer.SwitchSection(CPSections[i].S);
429    EmitAlignment(Log2_32(CPSections[i].Alignment));
430
431    unsigned Offset = 0;
432    for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
433      unsigned CPI = CPSections[i].CPEs[j];
434      MachineConstantPoolEntry CPE = CP[CPI];
435
436      // Emit inter-object padding for alignment.
437      unsigned AlignMask = CPE.getAlignment() - 1;
438      unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
439      OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/);
440
441      const Type *Ty = CPE.getType();
442      Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
443
444      O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
445        << CPI << ':';
446      if (VerboseAsm) {
447        O.PadToColumn(MAI->getCommentColumn());
448        O << MAI->getCommentString() << " constant ";
449        WriteTypeSymbolic(O, CPE.getType(), MF->getFunction()->getParent());
450      }
451      O << '\n';
452      if (CPE.isMachineConstantPoolEntry())
453        EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
454      else
455        EmitGlobalConstant(CPE.Val.ConstVal);
456    }
457  }
458}
459
460/// EmitJumpTableInfo - Print assembly representations of the jump tables used
461/// by the current function to the current output stream.
462///
463void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
464                                   MachineFunction &MF) {
465  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
466  if (JT.empty()) return;
467
468  bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
469
470  // Pick the directive to use to print the jump table entries, and switch to
471  // the appropriate section.
472  TargetLowering *LoweringInfo = TM.getTargetLowering();
473
474  const Function *F = MF.getFunction();
475  bool JTInDiffSection = false;
476  if (F->isWeakForLinker() ||
477      (IsPic && !LoweringInfo->usesGlobalOffsetTable())) {
478    // In PIC mode, we need to emit the jump table to the same section as the
479    // function body itself, otherwise the label differences won't make sense.
480    // We should also do if the section name is NULL or function is declared in
481    // discardable section.
482    OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang,
483                                                                    TM));
484  } else {
485    // Otherwise, drop it in the readonly section.
486    const MCSection *ReadOnlySection =
487      getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
488    OutStreamer.SwitchSection(ReadOnlySection);
489    JTInDiffSection = true;
490  }
491
492  EmitAlignment(Log2_32(MJTI->getAlignment()));
493
494  for (unsigned i = 0, e = JT.size(); i != e; ++i) {
495    const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
496
497    // If this jump table was deleted, ignore it.
498    if (JTBBs.empty()) continue;
499
500    // For PIC codegen, if possible we want to use the SetDirective to reduce
501    // the number of relocations the assembler will generate for the jump table.
502    // Set directives are all printed before the jump table itself.
503    SmallPtrSet<MachineBasicBlock*, 16> EmittedSets;
504    if (MAI->getSetDirective() && IsPic)
505      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
506        if (EmittedSets.insert(JTBBs[ii]))
507          printPICJumpTableSetLabel(i, JTBBs[ii]);
508
509    // On some targets (e.g. Darwin) we want to emit two consequtive labels
510    // before each jump table.  The first label is never referenced, but tells
511    // the assembler and linker the extents of the jump table object.  The
512    // second label is actually referenced by the code.
513    if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0]) {
514      O << MAI->getLinkerPrivateGlobalPrefix()
515        << "JTI" << getFunctionNumber() << '_' << i << ":\n";
516    }
517
518    O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
519      << '_' << i << ":\n";
520
521    for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
522      printPICJumpTableEntry(MJTI, JTBBs[ii], i);
523      O << '\n';
524    }
525  }
526}
527
528void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
529                                        const MachineBasicBlock *MBB,
530                                        unsigned uid)  const {
531  bool isPIC = TM.getRelocationModel() == Reloc::PIC_;
532
533  // Use JumpTableDirective otherwise honor the entry size from the jump table
534  // info.
535  const char *JTEntryDirective = MAI->getJumpTableDirective(isPIC);
536  bool HadJTEntryDirective = JTEntryDirective != NULL;
537  if (!HadJTEntryDirective) {
538    JTEntryDirective = MJTI->getEntrySize() == 4 ?
539      MAI->getData32bitsDirective() : MAI->getData64bitsDirective();
540  }
541
542  O << JTEntryDirective << ' ';
543
544  // If we have emitted set directives for the jump table entries, print
545  // them rather than the entries themselves.  If we're emitting PIC, then
546  // emit the table entries as differences between two text section labels.
547  // If we're emitting non-PIC code, then emit the entries as direct
548  // references to the target basic blocks.
549  if (!isPIC) {
550    O << *GetMBBSymbol(MBB->getNumber());
551  } else if (MAI->getSetDirective()) {
552    O << MAI->getPrivateGlobalPrefix() << getFunctionNumber()
553      << '_' << uid << "_set_" << MBB->getNumber();
554  } else {
555    O << *GetMBBSymbol(MBB->getNumber());
556    // If the arch uses custom Jump Table directives, don't calc relative to
557    // JT
558    if (!HadJTEntryDirective)
559      O << '-' << MAI->getPrivateGlobalPrefix() << "JTI"
560        << getFunctionNumber() << '_' << uid;
561  }
562}
563
564
565/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
566/// special global used by LLVM.  If so, emit it and return true, otherwise
567/// do nothing and return false.
568bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
569  if (GV->getName() == "llvm.used") {
570    if (MAI->getUsedDirective() != 0)    // No need to emit this at all.
571      EmitLLVMUsedList(GV->getInitializer());
572    return true;
573  }
574
575  // Ignore debug and non-emitted data.  This handles llvm.compiler.used.
576  if (GV->getSection() == "llvm.metadata" ||
577      GV->hasAvailableExternallyLinkage())
578    return true;
579
580  if (!GV->hasAppendingLinkage()) return false;
581
582  assert(GV->hasInitializer() && "Not a special LLVM global!");
583
584  const TargetData *TD = TM.getTargetData();
585  unsigned Align = Log2_32(TD->getPointerPrefAlignment());
586  if (GV->getName() == "llvm.global_ctors") {
587    OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
588    EmitAlignment(Align, 0);
589    EmitXXStructorList(GV->getInitializer());
590
591    if (TM.getRelocationModel() == Reloc::Static &&
592        MAI->hasStaticCtorDtorReferenceInStaticMode())
593      O << ".reference .constructors_used\n";
594    return true;
595  }
596
597  if (GV->getName() == "llvm.global_dtors") {
598    OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
599    EmitAlignment(Align, 0);
600    EmitXXStructorList(GV->getInitializer());
601
602    if (TM.getRelocationModel() == Reloc::Static &&
603        MAI->hasStaticCtorDtorReferenceInStaticMode())
604      O << ".reference .destructors_used\n";
605    return true;
606  }
607
608  return false;
609}
610
611/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
612/// global in the specified llvm.used list for which emitUsedDirectiveFor
613/// is true, as being used with this directive.
614void AsmPrinter::EmitLLVMUsedList(Constant *List) {
615  const char *Directive = MAI->getUsedDirective();
616
617  // Should be an array of 'i8*'.
618  ConstantArray *InitList = dyn_cast<ConstantArray>(List);
619  if (InitList == 0) return;
620
621  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
622    const GlobalValue *GV =
623      dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
624    if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang)) {
625      O << Directive;
626      EmitConstantValueOnly(InitList->getOperand(i));
627      O << '\n';
628    }
629  }
630}
631
632/// EmitXXStructorList - Emit the ctor or dtor list.  This just prints out the
633/// function pointers, ignoring the init priority.
634void AsmPrinter::EmitXXStructorList(Constant *List) {
635  // Should be an array of '{ int, void ()* }' structs.  The first value is the
636  // init priority, which we ignore.
637  if (!isa<ConstantArray>(List)) return;
638  ConstantArray *InitList = cast<ConstantArray>(List);
639  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
640    if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
641      if (CS->getNumOperands() != 2) return;  // Not array of 2-element structs.
642
643      if (CS->getOperand(1)->isNullValue())
644        return;  // Found a null terminator, exit printing.
645      // Emit the function pointer.
646      EmitGlobalConstant(CS->getOperand(1));
647    }
648}
649
650
651//===----------------------------------------------------------------------===//
652/// LEB 128 number encoding.
653
654/// PrintULEB128 - Print a series of hexadecimal values (separated by commas)
655/// representing an unsigned leb128 value.
656void AsmPrinter::PrintULEB128(unsigned Value) const {
657  do {
658    unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
659    Value >>= 7;
660    if (Value) Byte |= 0x80;
661    PrintHex(Byte);
662    if (Value) O << ", ";
663  } while (Value);
664}
665
666/// PrintSLEB128 - Print a series of hexadecimal values (separated by commas)
667/// representing a signed leb128 value.
668void AsmPrinter::PrintSLEB128(int Value) const {
669  int Sign = Value >> (8 * sizeof(Value) - 1);
670  bool IsMore;
671
672  do {
673    unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
674    Value >>= 7;
675    IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
676    if (IsMore) Byte |= 0x80;
677    PrintHex(Byte);
678    if (IsMore) O << ", ";
679  } while (IsMore);
680}
681
682//===--------------------------------------------------------------------===//
683// Emission and print routines
684//
685
686/// PrintHex - Print a value as a hexadecimal value.
687///
688void AsmPrinter::PrintHex(uint64_t Value) const {
689  O << "0x";
690  O.write_hex(Value);
691}
692
693/// EOL - Print a newline character to asm stream.  If a comment is present
694/// then it will be printed first.  Comments should not contain '\n'.
695void AsmPrinter::EOL() const {
696  O << '\n';
697}
698
699void AsmPrinter::EOL(const Twine &Comment) const {
700  if (VerboseAsm && !Comment.isTriviallyEmpty()) {
701    O.PadToColumn(MAI->getCommentColumn());
702    O << MAI->getCommentString()
703      << ' '
704      << Comment;
705  }
706  O << '\n';
707}
708
709static const char *DecodeDWARFEncoding(unsigned Encoding) {
710  switch (Encoding) {
711  case dwarf::DW_EH_PE_absptr:
712    return "absptr";
713  case dwarf::DW_EH_PE_omit:
714    return "omit";
715  case dwarf::DW_EH_PE_pcrel:
716    return "pcrel";
717  case dwarf::DW_EH_PE_udata4:
718    return "udata4";
719  case dwarf::DW_EH_PE_udata8:
720    return "udata8";
721  case dwarf::DW_EH_PE_sdata4:
722    return "sdata4";
723  case dwarf::DW_EH_PE_sdata8:
724    return "sdata8";
725  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4:
726    return "pcrel udata4";
727  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4:
728    return "pcrel sdata4";
729  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8:
730    return "pcrel udata8";
731  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8:
732    return "pcrel sdata8";
733  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata4:
734    return "indirect pcrel udata4";
735  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata4:
736    return "indirect pcrel sdata4";
737  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata8:
738    return "indirect pcrel udata8";
739  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata8:
740    return "indirect pcrel sdata8";
741  }
742
743  return 0;
744}
745
746void AsmPrinter::EOL(const Twine &Comment, unsigned Encoding) const {
747  if (VerboseAsm && !Comment.isTriviallyEmpty()) {
748    O.PadToColumn(MAI->getCommentColumn());
749    O << MAI->getCommentString()
750      << ' '
751      << Comment;
752
753    if (const char *EncStr = DecodeDWARFEncoding(Encoding))
754      O << " (" << EncStr << ')';
755  }
756  O << '\n';
757}
758
759/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
760/// unsigned leb128 value.
761void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
762  if (MAI->hasLEB128()) {
763    O << "\t.uleb128\t"
764      << Value;
765  } else {
766    O << MAI->getData8bitsDirective();
767    PrintULEB128(Value);
768  }
769}
770
771/// EmitSLEB128Bytes - print an assembler byte data directive to compose a
772/// signed leb128 value.
773void AsmPrinter::EmitSLEB128Bytes(int Value) const {
774  if (MAI->hasLEB128()) {
775    O << "\t.sleb128\t"
776      << Value;
777  } else {
778    O << MAI->getData8bitsDirective();
779    PrintSLEB128(Value);
780  }
781}
782
783/// EmitInt8 - Emit a byte directive and value.
784///
785void AsmPrinter::EmitInt8(int Value) const {
786  O << MAI->getData8bitsDirective();
787  PrintHex(Value & 0xFF);
788}
789
790/// EmitInt16 - Emit a short directive and value.
791///
792void AsmPrinter::EmitInt16(int Value) const {
793  O << MAI->getData16bitsDirective();
794  PrintHex(Value & 0xFFFF);
795}
796
797/// EmitInt32 - Emit a long directive and value.
798///
799void AsmPrinter::EmitInt32(int Value) const {
800  O << MAI->getData32bitsDirective();
801  PrintHex(Value);
802}
803
804/// EmitInt64 - Emit a long long directive and value.
805///
806void AsmPrinter::EmitInt64(uint64_t Value) const {
807  if (MAI->getData64bitsDirective()) {
808    O << MAI->getData64bitsDirective();
809    PrintHex(Value);
810  } else {
811    if (TM.getTargetData()->isBigEndian()) {
812      EmitInt32(unsigned(Value >> 32)); O << '\n';
813      EmitInt32(unsigned(Value));
814    } else {
815      EmitInt32(unsigned(Value)); O << '\n';
816      EmitInt32(unsigned(Value >> 32));
817    }
818  }
819}
820
821/// toOctal - Convert the low order bits of X into an octal digit.
822///
823static inline char toOctal(int X) {
824  return (X&7)+'0';
825}
826
827/// printStringChar - Print a char, escaped if necessary.
828///
829static void printStringChar(formatted_raw_ostream &O, unsigned char C) {
830  if (C == '"') {
831    O << "\\\"";
832  } else if (C == '\\') {
833    O << "\\\\";
834  } else if (isprint((unsigned char)C)) {
835    O << C;
836  } else {
837    switch(C) {
838    case '\b': O << "\\b"; break;
839    case '\f': O << "\\f"; break;
840    case '\n': O << "\\n"; break;
841    case '\r': O << "\\r"; break;
842    case '\t': O << "\\t"; break;
843    default:
844      O << '\\';
845      O << toOctal(C >> 6);
846      O << toOctal(C >> 3);
847      O << toOctal(C >> 0);
848      break;
849    }
850  }
851}
852
853/// EmitString - Emit a string with quotes and a null terminator.
854/// Special characters are emitted properly.
855/// \literal (Eg. '\t') \endliteral
856void AsmPrinter::EmitString(const StringRef String) const {
857  EmitString(String.data(), String.size());
858}
859
860void AsmPrinter::EmitString(const char *String, unsigned Size) const {
861  const char* AscizDirective = MAI->getAscizDirective();
862  if (AscizDirective)
863    O << AscizDirective;
864  else
865    O << MAI->getAsciiDirective();
866  O << '\"';
867  for (unsigned i = 0; i < Size; ++i)
868    printStringChar(O, String[i]);
869  if (AscizDirective)
870    O << '\"';
871  else
872    O << "\\0\"";
873}
874
875
876/// EmitFile - Emit a .file directive.
877void AsmPrinter::EmitFile(unsigned Number, StringRef Name) const {
878  O << "\t.file\t" << Number << " \"";
879  for (unsigned i = 0, N = Name.size(); i < N; ++i)
880    printStringChar(O, Name[i]);
881  O << '\"';
882}
883
884
885//===----------------------------------------------------------------------===//
886
887// EmitAlignment - Emit an alignment directive to the specified power of
888// two boundary.  For example, if you pass in 3 here, you will get an 8
889// byte alignment.  If a global value is specified, and if that global has
890// an explicit alignment requested, it will unconditionally override the
891// alignment request.  However, if ForcedAlignBits is specified, this value
892// has final say: the ultimate alignment will be the max of ForcedAlignBits
893// and the alignment computed with NumBits and the global.
894//
895// The algorithm is:
896//     Align = NumBits;
897//     if (GV && GV->hasalignment) Align = GV->getalignment();
898//     Align = std::max(Align, ForcedAlignBits);
899//
900void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
901                               unsigned ForcedAlignBits,
902                               bool UseFillExpr) const {
903  if (GV && GV->getAlignment())
904    NumBits = Log2_32(GV->getAlignment());
905  NumBits = std::max(NumBits, ForcedAlignBits);
906
907  if (NumBits == 0) return;   // No need to emit alignment.
908
909  unsigned FillValue = 0;
910  if (getCurrentSection()->getKind().isText())
911    FillValue = MAI->getTextAlignFillValue();
912
913  OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0);
914}
915
916// Print out the specified constant, without a storage class.  Only the
917// constants valid in constant expressions can occur here.
918void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
919  if (CV->isNullValue() || isa<UndefValue>(CV)) {
920    O << '0';
921    return;
922  }
923
924  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
925    O << CI->getZExtValue();
926    return;
927  }
928
929  if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
930    // This is a constant address for a global variable or function. Use the
931    // name of the variable or function as the address value.
932    O << *GetGlobalValueSymbol(GV);
933    return;
934  }
935
936  if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV)) {
937    O << *GetBlockAddressSymbol(BA);
938    return;
939  }
940
941  const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
942  if (CE == 0) {
943    llvm_unreachable("Unknown constant value!");
944    O << '0';
945    return;
946  }
947
948  switch (CE->getOpcode()) {
949  case Instruction::ZExt:
950  case Instruction::SExt:
951  case Instruction::FPTrunc:
952  case Instruction::FPExt:
953  case Instruction::UIToFP:
954  case Instruction::SIToFP:
955  case Instruction::FPToUI:
956  case Instruction::FPToSI:
957  default:
958    llvm_unreachable("FIXME: Don't support this constant cast expr");
959  case Instruction::GetElementPtr: {
960    // generate a symbolic expression for the byte address
961    const TargetData *TD = TM.getTargetData();
962    const Constant *ptrVal = CE->getOperand(0);
963    SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
964    int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
965                                          idxVec.size());
966    if (Offset == 0)
967      return EmitConstantValueOnly(ptrVal);
968
969    // Truncate/sext the offset to the pointer size.
970    if (TD->getPointerSizeInBits() != 64) {
971      int SExtAmount = 64-TD->getPointerSizeInBits();
972      Offset = (Offset << SExtAmount) >> SExtAmount;
973    }
974
975    if (Offset)
976      O << '(';
977    EmitConstantValueOnly(ptrVal);
978    if (Offset > 0)
979      O << ") + " << Offset;
980    else
981      O << ") - " << -Offset;
982    return;
983  }
984  case Instruction::BitCast:
985    return EmitConstantValueOnly(CE->getOperand(0));
986
987  case Instruction::IntToPtr: {
988    // Handle casts to pointers by changing them into casts to the appropriate
989    // integer type.  This promotes constant folding and simplifies this code.
990    const TargetData *TD = TM.getTargetData();
991    Constant *Op = CE->getOperand(0);
992    Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(CV->getContext()),
993                                      false/*ZExt*/);
994    return EmitConstantValueOnly(Op);
995  }
996
997  case Instruction::PtrToInt: {
998    // Support only foldable casts to/from pointers that can be eliminated by
999    // changing the pointer to the appropriately sized integer type.
1000    Constant *Op = CE->getOperand(0);
1001    const Type *Ty = CE->getType();
1002    const TargetData *TD = TM.getTargetData();
1003
1004    // We can emit the pointer value into this slot if the slot is an
1005    // integer slot greater or equal to the size of the pointer.
1006    if (TD->getTypeAllocSize(Ty) == TD->getTypeAllocSize(Op->getType()))
1007      return EmitConstantValueOnly(Op);
1008
1009    O << "((";
1010    EmitConstantValueOnly(Op);
1011    APInt ptrMask =
1012      APInt::getAllOnesValue(TD->getTypeAllocSizeInBits(Op->getType()));
1013
1014    SmallString<40> S;
1015    ptrMask.toStringUnsigned(S);
1016    O << ") & " << S.str() << ')';
1017    return;
1018  }
1019
1020  case Instruction::Trunc:
1021    // We emit the value and depend on the assembler to truncate the generated
1022    // expression properly.  This is important for differences between
1023    // blockaddress labels.  Since the two labels are in the same function, it
1024    // is reasonable to treat their delta as a 32-bit value.
1025    return EmitConstantValueOnly(CE->getOperand(0));
1026
1027  case Instruction::Add:
1028  case Instruction::Sub:
1029  case Instruction::And:
1030  case Instruction::Or:
1031  case Instruction::Xor:
1032    O << '(';
1033    EmitConstantValueOnly(CE->getOperand(0));
1034    O << ')';
1035    switch (CE->getOpcode()) {
1036    case Instruction::Add:
1037     O << " + ";
1038     break;
1039    case Instruction::Sub:
1040     O << " - ";
1041     break;
1042    case Instruction::And:
1043     O << " & ";
1044     break;
1045    case Instruction::Or:
1046     O << " | ";
1047     break;
1048    case Instruction::Xor:
1049     O << " ^ ";
1050     break;
1051    default:
1052     break;
1053    }
1054    O << '(';
1055    EmitConstantValueOnly(CE->getOperand(1));
1056    O << ')';
1057    break;
1058  }
1059}
1060
1061/// EmitZeros - Emit a block of zeros.
1062///
1063void AsmPrinter::EmitZeros(uint64_t NumZeros, unsigned AddrSpace) const {
1064  OutStreamer.EmitFill(NumZeros, 0, AddrSpace);
1065}
1066
1067/// printAsCString - Print the specified array as a C compatible string, only if
1068/// the predicate isString is true.
1069///
1070static void printAsCString(formatted_raw_ostream &O, const ConstantArray *CVA,
1071                           unsigned LastElt) {
1072  assert(CVA->isString() && "Array is not string compatible!");
1073
1074  O << '\"';
1075  for (unsigned i = 0; i != LastElt; ++i) {
1076    unsigned char C =
1077        (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
1078    printStringChar(O, C);
1079  }
1080  O << '\"';
1081}
1082
1083/// EmitString - Emit a zero-byte-terminated string constant.
1084///
1085void AsmPrinter::EmitString(const ConstantArray *CVA) const {
1086  unsigned NumElts = CVA->getNumOperands();
1087  if (MAI->getAscizDirective() && NumElts &&
1088      cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
1089    O << MAI->getAscizDirective();
1090    printAsCString(O, CVA, NumElts-1);
1091  } else {
1092    O << MAI->getAsciiDirective();
1093    printAsCString(O, CVA, NumElts);
1094  }
1095  O << '\n';
1096}
1097
1098static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace,
1099                                    AsmPrinter &AP) {
1100  if (AddrSpace == 0 && CA->isString()) {
1101    AP.EmitString(CA);
1102  } else { // Not a string.  Print the values in successive locations
1103    for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
1104      AP.EmitGlobalConstant(CA->getOperand(i), AddrSpace);
1105  }
1106}
1107
1108static void EmitGlobalConstantVector(const ConstantVector *CV,
1109                                     unsigned AddrSpace, AsmPrinter &AP) {
1110  const VectorType *VTy = CV->getType();
1111  for (unsigned i = 0, e = VTy->getNumElements(); i != e; ++i)
1112    AP.EmitGlobalConstant(CV->getOperand(i), AddrSpace);
1113}
1114
1115static void EmitGlobalConstantStruct(const ConstantStruct *CS,
1116                                     unsigned AddrSpace, AsmPrinter &AP) {
1117  // Print the fields in successive locations. Pad to align if needed!
1118  const TargetData *TD = AP.TM.getTargetData();
1119  unsigned Size = TD->getTypeAllocSize(CS->getType());
1120  const StructLayout *cvsLayout = TD->getStructLayout(CS->getType());
1121  uint64_t SizeSoFar = 0;
1122  for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
1123    const Constant *field = CS->getOperand(i);
1124
1125    // Check if padding is needed and insert one or more 0s.
1126    uint64_t fieldSize = TD->getTypeAllocSize(field->getType());
1127    uint64_t padSize = ((i == e-1 ? Size : cvsLayout->getElementOffset(i+1))
1128                        - cvsLayout->getElementOffset(i)) - fieldSize;
1129    SizeSoFar += fieldSize + padSize;
1130
1131    // Now print the actual field value.
1132    AP.EmitGlobalConstant(field, AddrSpace);
1133
1134    // Insert padding - this may include padding to increase the size of the
1135    // current field up to the ABI size (if the struct is not packed) as well
1136    // as padding to ensure that the next field starts at the right offset.
1137    AP.EmitZeros(padSize, AddrSpace);
1138  }
1139  assert(SizeSoFar == cvsLayout->getSizeInBytes() &&
1140         "Layout of constant struct may be incorrect!");
1141}
1142
1143void AsmPrinter::EmitGlobalConstantFP(const ConstantFP *CFP,
1144                                      unsigned AddrSpace) {
1145  // FP Constants are printed as integer constants to avoid losing
1146  // precision...
1147  const TargetData &TD = *TM.getTargetData();
1148  if (CFP->getType()->isDoubleTy()) {
1149    double Val = CFP->getValueAPF().convertToDouble();  // for comment only
1150    uint64_t i = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1151    if (MAI->getData64bitsDirective(AddrSpace)) {
1152      O << MAI->getData64bitsDirective(AddrSpace) << i;
1153      if (VerboseAsm) {
1154        O.PadToColumn(MAI->getCommentColumn());
1155        O << MAI->getCommentString() << " double " << Val;
1156      }
1157      O << '\n';
1158    } else if (TD.isBigEndian()) {
1159      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1160      if (VerboseAsm) {
1161        O.PadToColumn(MAI->getCommentColumn());
1162        O << MAI->getCommentString()
1163          << " most significant word of double " << Val;
1164      }
1165      O << '\n';
1166      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1167      if (VerboseAsm) {
1168        O.PadToColumn(MAI->getCommentColumn());
1169        O << MAI->getCommentString()
1170          << " least significant word of double " << Val;
1171      }
1172      O << '\n';
1173    } else {
1174      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1175      if (VerboseAsm) {
1176        O.PadToColumn(MAI->getCommentColumn());
1177        O << MAI->getCommentString()
1178          << " least significant word of double " << Val;
1179      }
1180      O << '\n';
1181      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1182      if (VerboseAsm) {
1183        O.PadToColumn(MAI->getCommentColumn());
1184        O << MAI->getCommentString()
1185          << " most significant word of double " << Val;
1186      }
1187      O << '\n';
1188    }
1189    return;
1190  }
1191
1192  if (CFP->getType()->isFloatTy()) {
1193    float Val = CFP->getValueAPF().convertToFloat();  // for comment only
1194    O << MAI->getData32bitsDirective(AddrSpace)
1195      << CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1196    if (VerboseAsm) {
1197      O.PadToColumn(MAI->getCommentColumn());
1198      O << MAI->getCommentString() << " float " << Val;
1199    }
1200    O << '\n';
1201    return;
1202  }
1203
1204  if (CFP->getType()->isX86_FP80Ty()) {
1205    // all long double variants are printed as hex
1206    // api needed to prevent premature destruction
1207    APInt api = CFP->getValueAPF().bitcastToAPInt();
1208    const uint64_t *p = api.getRawData();
1209    // Convert to double so we can print the approximate val as a comment.
1210    APFloat DoubleVal = CFP->getValueAPF();
1211    bool ignored;
1212    DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1213                      &ignored);
1214    if (TD.isBigEndian()) {
1215      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1216      if (VerboseAsm) {
1217        O.PadToColumn(MAI->getCommentColumn());
1218        O << MAI->getCommentString()
1219          << " most significant halfword of x86_fp80 ~"
1220          << DoubleVal.convertToDouble();
1221      }
1222      O << '\n';
1223      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1224      if (VerboseAsm) {
1225        O.PadToColumn(MAI->getCommentColumn());
1226        O << MAI->getCommentString() << " next halfword";
1227      }
1228      O << '\n';
1229      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1230      if (VerboseAsm) {
1231        O.PadToColumn(MAI->getCommentColumn());
1232        O << MAI->getCommentString() << " next halfword";
1233      }
1234      O << '\n';
1235      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1236      if (VerboseAsm) {
1237        O.PadToColumn(MAI->getCommentColumn());
1238        O << MAI->getCommentString() << " next halfword";
1239      }
1240      O << '\n';
1241      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1242      if (VerboseAsm) {
1243        O.PadToColumn(MAI->getCommentColumn());
1244        O << MAI->getCommentString()
1245          << " least significant halfword";
1246      }
1247      O << '\n';
1248     } else {
1249      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1250      if (VerboseAsm) {
1251        O.PadToColumn(MAI->getCommentColumn());
1252        O << MAI->getCommentString()
1253          << " least significant halfword of x86_fp80 ~"
1254          << DoubleVal.convertToDouble();
1255      }
1256      O << '\n';
1257      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1258      if (VerboseAsm) {
1259        O.PadToColumn(MAI->getCommentColumn());
1260        O << MAI->getCommentString()
1261          << " next halfword";
1262      }
1263      O << '\n';
1264      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1265      if (VerboseAsm) {
1266        O.PadToColumn(MAI->getCommentColumn());
1267        O << MAI->getCommentString()
1268          << " next halfword";
1269      }
1270      O << '\n';
1271      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1272      if (VerboseAsm) {
1273        O.PadToColumn(MAI->getCommentColumn());
1274        O << MAI->getCommentString()
1275          << " next halfword";
1276      }
1277      O << '\n';
1278      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1279      if (VerboseAsm) {
1280        O.PadToColumn(MAI->getCommentColumn());
1281        O << MAI->getCommentString()
1282          << " most significant halfword";
1283      }
1284      O << '\n';
1285    }
1286    LLVMContext &Context = CFP->getContext();
1287    EmitZeros(TD.getTypeAllocSize(Type::getX86_FP80Ty(Context)) -
1288              TD.getTypeStoreSize(Type::getX86_FP80Ty(Context)), AddrSpace);
1289    return;
1290  }
1291
1292  if (CFP->getType()->isPPC_FP128Ty()) {
1293    // all long double variants are printed as hex
1294    // api needed to prevent premature destruction
1295    APInt api = CFP->getValueAPF().bitcastToAPInt();
1296    const uint64_t *p = api.getRawData();
1297    if (TD.isBigEndian()) {
1298      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1299      if (VerboseAsm) {
1300        O.PadToColumn(MAI->getCommentColumn());
1301        O << MAI->getCommentString()
1302          << " most significant word of ppc_fp128";
1303      }
1304      O << '\n';
1305      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1306      if (VerboseAsm) {
1307        O.PadToColumn(MAI->getCommentColumn());
1308        O << MAI->getCommentString()
1309        << " next word";
1310      }
1311      O << '\n';
1312      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1313      if (VerboseAsm) {
1314        O.PadToColumn(MAI->getCommentColumn());
1315        O << MAI->getCommentString()
1316          << " next word";
1317      }
1318      O << '\n';
1319      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
1320      if (VerboseAsm) {
1321        O.PadToColumn(MAI->getCommentColumn());
1322        O << MAI->getCommentString()
1323          << " least significant word";
1324      }
1325      O << '\n';
1326     } else {
1327      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
1328      if (VerboseAsm) {
1329        O.PadToColumn(MAI->getCommentColumn());
1330        O << MAI->getCommentString()
1331          << " least significant word of ppc_fp128";
1332      }
1333      O << '\n';
1334      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1335      if (VerboseAsm) {
1336        O.PadToColumn(MAI->getCommentColumn());
1337        O << MAI->getCommentString()
1338          << " next word";
1339      }
1340      O << '\n';
1341      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1342      if (VerboseAsm) {
1343        O.PadToColumn(MAI->getCommentColumn());
1344        O << MAI->getCommentString()
1345          << " next word";
1346      }
1347      O << '\n';
1348      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1349      if (VerboseAsm) {
1350        O.PadToColumn(MAI->getCommentColumn());
1351        O << MAI->getCommentString()
1352          << " most significant word";
1353      }
1354      O << '\n';
1355    }
1356    return;
1357  } else llvm_unreachable("Floating point constant type not handled");
1358}
1359
1360void AsmPrinter::EmitGlobalConstantLargeInt(const ConstantInt *CI,
1361                                            unsigned AddrSpace) {
1362  const TargetData *TD = TM.getTargetData();
1363  unsigned BitWidth = CI->getBitWidth();
1364  assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
1365
1366  // We don't expect assemblers to support integer data directives
1367  // for more than 64 bits, so we emit the data in at most 64-bit
1368  // quantities at a time.
1369  const uint64_t *RawData = CI->getValue().getRawData();
1370  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1371    uint64_t Val;
1372    if (TD->isBigEndian())
1373      Val = RawData[e - i - 1];
1374    else
1375      Val = RawData[i];
1376
1377    if (MAI->getData64bitsDirective(AddrSpace)) {
1378      O << MAI->getData64bitsDirective(AddrSpace) << Val << '\n';
1379      continue;
1380    }
1381
1382    // Emit two 32-bit chunks, order depends on endianness.
1383    unsigned FirstChunk = unsigned(Val), SecondChunk = unsigned(Val >> 32);
1384    const char *FirstName = " least", *SecondName = " most";
1385    if (TD->isBigEndian()) {
1386      std::swap(FirstChunk, SecondChunk);
1387      std::swap(FirstName, SecondName);
1388    }
1389
1390    O << MAI->getData32bitsDirective(AddrSpace) << FirstChunk;
1391    if (VerboseAsm) {
1392      O.PadToColumn(MAI->getCommentColumn());
1393      O << MAI->getCommentString()
1394        << FirstName << " significant half of i64 " << Val;
1395    }
1396    O << '\n';
1397
1398    O << MAI->getData32bitsDirective(AddrSpace) << SecondChunk;
1399    if (VerboseAsm) {
1400      O.PadToColumn(MAI->getCommentColumn());
1401      O << MAI->getCommentString()
1402        << SecondName << " significant half of i64 " << Val;
1403    }
1404    O << '\n';
1405  }
1406}
1407
1408/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1409void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1410  const TargetData *TD = TM.getTargetData();
1411  const Type *type = CV->getType();
1412  unsigned Size = TD->getTypeAllocSize(type);
1413
1414  if (CV->isNullValue() || isa<UndefValue>(CV))
1415    return EmitZeros(Size, AddrSpace);
1416
1417  if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
1418    return EmitGlobalConstantArray(CVA, AddrSpace, *this);
1419
1420  if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
1421    return EmitGlobalConstantStruct(CVS, AddrSpace, *this);
1422
1423  if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
1424    return EmitGlobalConstantFP(CFP, AddrSpace);
1425
1426  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1427    // If we can directly emit an 8-byte constant, do it.
1428    if (Size == 8)
1429      if (const char *Data64Dir = MAI->getData64bitsDirective(AddrSpace)) {
1430        O << Data64Dir << CI->getZExtValue() << '\n';
1431        return;
1432      }
1433
1434    // Small integers are handled below; large integers are handled here.
1435    if (Size > 4) {
1436      EmitGlobalConstantLargeInt(CI, AddrSpace);
1437      return;
1438    }
1439  }
1440
1441  if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
1442    return EmitGlobalConstantVector(V, AddrSpace, *this);
1443
1444  printDataDirective(type, AddrSpace);
1445  EmitConstantValueOnly(CV);
1446  if (VerboseAsm) {
1447    if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1448      SmallString<40> S;
1449      CI->getValue().toStringUnsigned(S, 16);
1450      O.PadToColumn(MAI->getCommentColumn());
1451      O << MAI->getCommentString() << " 0x" << S.str();
1452    }
1453  }
1454  O << '\n';
1455}
1456
1457void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1458  // Target doesn't support this yet!
1459  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1460}
1461
1462/// PrintSpecial - Print information related to the specified machine instr
1463/// that is independent of the operand, and may be independent of the instr
1464/// itself.  This can be useful for portably encoding the comment character
1465/// or other bits of target-specific knowledge into the asmstrings.  The
1466/// syntax used is ${:comment}.  Targets can override this to add support
1467/// for their own strange codes.
1468void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1469  if (!strcmp(Code, "private")) {
1470    O << MAI->getPrivateGlobalPrefix();
1471  } else if (!strcmp(Code, "comment")) {
1472    if (VerboseAsm)
1473      O << MAI->getCommentString();
1474  } else if (!strcmp(Code, "uid")) {
1475    // Comparing the address of MI isn't sufficient, because machineinstrs may
1476    // be allocated to the same address across functions.
1477    const Function *ThisF = MI->getParent()->getParent()->getFunction();
1478
1479    // If this is a new LastFn instruction, bump the counter.
1480    if (LastMI != MI || LastFn != ThisF) {
1481      ++Counter;
1482      LastMI = MI;
1483      LastFn = ThisF;
1484    }
1485    O << Counter;
1486  } else {
1487    std::string msg;
1488    raw_string_ostream Msg(msg);
1489    Msg << "Unknown special formatter '" << Code
1490         << "' for machine instr: " << *MI;
1491    llvm_report_error(Msg.str());
1492  }
1493}
1494
1495/// processDebugLoc - Processes the debug information of each machine
1496/// instruction's DebugLoc.
1497void AsmPrinter::processDebugLoc(const MachineInstr *MI,
1498                                 bool BeforePrintingInsn) {
1499  if (!MAI || !DW || !MAI->doesSupportDebugInformation()
1500      || !DW->ShouldEmitDwarfDebug())
1501    return;
1502  DebugLoc DL = MI->getDebugLoc();
1503  if (DL.isUnknown())
1504    return;
1505  DILocation CurDLT = MF->getDILocation(DL);
1506  if (CurDLT.getScope().isNull())
1507    return;
1508
1509  if (BeforePrintingInsn) {
1510    if (CurDLT.getNode() != PrevDLT) {
1511      unsigned L = DW->RecordSourceLine(CurDLT.getLineNumber(),
1512                                        CurDLT.getColumnNumber(),
1513                                        CurDLT.getScope().getNode());
1514      printLabel(L);
1515      O << '\n';
1516      DW->BeginScope(MI, L);
1517      PrevDLT = CurDLT.getNode();
1518    }
1519  } else {
1520    // After printing instruction
1521    DW->EndScope(MI);
1522  }
1523}
1524
1525
1526/// printInlineAsm - This method formats and prints the specified machine
1527/// instruction that is an inline asm.
1528void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1529  unsigned NumOperands = MI->getNumOperands();
1530
1531  // Count the number of register definitions.
1532  unsigned NumDefs = 0;
1533  for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1534       ++NumDefs)
1535    assert(NumDefs != NumOperands-1 && "No asm string?");
1536
1537  assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1538
1539  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1540  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1541
1542  O << '\t';
1543
1544  // If this asmstr is empty, just print the #APP/#NOAPP markers.
1545  // These are useful to see where empty asm's wound up.
1546  if (AsmStr[0] == 0) {
1547    O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1548    O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
1549    return;
1550  }
1551
1552  O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1553
1554  // The variant of the current asmprinter.
1555  int AsmPrinterVariant = MAI->getAssemblerDialect();
1556
1557  int CurVariant = -1;            // The number of the {.|.|.} region we are in.
1558  const char *LastEmitted = AsmStr; // One past the last character emitted.
1559
1560  while (*LastEmitted) {
1561    switch (*LastEmitted) {
1562    default: {
1563      // Not a special case, emit the string section literally.
1564      const char *LiteralEnd = LastEmitted+1;
1565      while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1566             *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1567        ++LiteralEnd;
1568      if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1569        O.write(LastEmitted, LiteralEnd-LastEmitted);
1570      LastEmitted = LiteralEnd;
1571      break;
1572    }
1573    case '\n':
1574      ++LastEmitted;   // Consume newline character.
1575      O << '\n';       // Indent code with newline.
1576      break;
1577    case '$': {
1578      ++LastEmitted;   // Consume '$' character.
1579      bool Done = true;
1580
1581      // Handle escapes.
1582      switch (*LastEmitted) {
1583      default: Done = false; break;
1584      case '$':     // $$ -> $
1585        if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1586          O << '$';
1587        ++LastEmitted;  // Consume second '$' character.
1588        break;
1589      case '(':             // $( -> same as GCC's { character.
1590        ++LastEmitted;      // Consume '(' character.
1591        if (CurVariant != -1) {
1592          llvm_report_error("Nested variants found in inline asm string: '"
1593                            + std::string(AsmStr) + "'");
1594        }
1595        CurVariant = 0;     // We're in the first variant now.
1596        break;
1597      case '|':
1598        ++LastEmitted;  // consume '|' character.
1599        if (CurVariant == -1)
1600          O << '|';       // this is gcc's behavior for | outside a variant
1601        else
1602          ++CurVariant;   // We're in the next variant.
1603        break;
1604      case ')':         // $) -> same as GCC's } char.
1605        ++LastEmitted;  // consume ')' character.
1606        if (CurVariant == -1)
1607          O << '}';     // this is gcc's behavior for } outside a variant
1608        else
1609          CurVariant = -1;
1610        break;
1611      }
1612      if (Done) break;
1613
1614      bool HasCurlyBraces = false;
1615      if (*LastEmitted == '{') {     // ${variable}
1616        ++LastEmitted;               // Consume '{' character.
1617        HasCurlyBraces = true;
1618      }
1619
1620      // If we have ${:foo}, then this is not a real operand reference, it is a
1621      // "magic" string reference, just like in .td files.  Arrange to call
1622      // PrintSpecial.
1623      if (HasCurlyBraces && *LastEmitted == ':') {
1624        ++LastEmitted;
1625        const char *StrStart = LastEmitted;
1626        const char *StrEnd = strchr(StrStart, '}');
1627        if (StrEnd == 0) {
1628          llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1629                            + std::string(AsmStr) + "'");
1630        }
1631
1632        std::string Val(StrStart, StrEnd);
1633        PrintSpecial(MI, Val.c_str());
1634        LastEmitted = StrEnd+1;
1635        break;
1636      }
1637
1638      const char *IDStart = LastEmitted;
1639      char *IDEnd;
1640      errno = 0;
1641      long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1642      if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1643        llvm_report_error("Bad $ operand number in inline asm string: '"
1644                          + std::string(AsmStr) + "'");
1645      }
1646      LastEmitted = IDEnd;
1647
1648      char Modifier[2] = { 0, 0 };
1649
1650      if (HasCurlyBraces) {
1651        // If we have curly braces, check for a modifier character.  This
1652        // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1653        if (*LastEmitted == ':') {
1654          ++LastEmitted;    // Consume ':' character.
1655          if (*LastEmitted == 0) {
1656            llvm_report_error("Bad ${:} expression in inline asm string: '"
1657                              + std::string(AsmStr) + "'");
1658          }
1659
1660          Modifier[0] = *LastEmitted;
1661          ++LastEmitted;    // Consume modifier character.
1662        }
1663
1664        if (*LastEmitted != '}') {
1665          llvm_report_error("Bad ${} expression in inline asm string: '"
1666                            + std::string(AsmStr) + "'");
1667        }
1668        ++LastEmitted;    // Consume '}' character.
1669      }
1670
1671      if ((unsigned)Val >= NumOperands-1) {
1672        llvm_report_error("Invalid $ operand number in inline asm string: '"
1673                          + std::string(AsmStr) + "'");
1674      }
1675
1676      // Okay, we finally have a value number.  Ask the target to print this
1677      // operand!
1678      if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1679        unsigned OpNo = 1;
1680
1681        bool Error = false;
1682
1683        // Scan to find the machine operand number for the operand.
1684        for (; Val; --Val) {
1685          if (OpNo >= MI->getNumOperands()) break;
1686          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1687          OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1688        }
1689
1690        if (OpNo >= MI->getNumOperands()) {
1691          Error = true;
1692        } else {
1693          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1694          ++OpNo;  // Skip over the ID number.
1695
1696          if (Modifier[0] == 'l')  // labels are target independent
1697            O << *GetMBBSymbol(MI->getOperand(OpNo).getMBB()->getNumber());
1698          else {
1699            AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1700            if ((OpFlags & 7) == 4) {
1701              Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1702                                                Modifier[0] ? Modifier : 0);
1703            } else {
1704              Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1705                                          Modifier[0] ? Modifier : 0);
1706            }
1707          }
1708        }
1709        if (Error) {
1710          std::string msg;
1711          raw_string_ostream Msg(msg);
1712          Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n";
1713          MI->print(Msg);
1714          llvm_report_error(Msg.str());
1715        }
1716      }
1717      break;
1718    }
1719    }
1720  }
1721  O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd();
1722}
1723
1724/// printImplicitDef - This method prints the specified machine instruction
1725/// that is an implicit def.
1726void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1727  if (!VerboseAsm) return;
1728  O.PadToColumn(MAI->getCommentColumn());
1729  O << MAI->getCommentString() << " implicit-def: "
1730    << TRI->getName(MI->getOperand(0).getReg());
1731}
1732
1733void AsmPrinter::printKill(const MachineInstr *MI) const {
1734  if (!VerboseAsm) return;
1735  O.PadToColumn(MAI->getCommentColumn());
1736  O << MAI->getCommentString() << " kill:";
1737  for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) {
1738    const MachineOperand &op = MI->getOperand(n);
1739    assert(op.isReg() && "KILL instruction must have only register operands");
1740    O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>");
1741  }
1742}
1743
1744/// printLabel - This method prints a local label used by debug and
1745/// exception handling tables.
1746void AsmPrinter::printLabel(const MachineInstr *MI) const {
1747  printLabel(MI->getOperand(0).getImm());
1748}
1749
1750void AsmPrinter::printLabel(unsigned Id) const {
1751  O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':';
1752}
1753
1754/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1755/// instruction, using the specified assembler variant.  Targets should
1756/// override this to format as appropriate.
1757bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1758                                 unsigned AsmVariant, const char *ExtraCode) {
1759  // Target doesn't support this yet!
1760  return true;
1761}
1762
1763bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1764                                       unsigned AsmVariant,
1765                                       const char *ExtraCode) {
1766  // Target doesn't support this yet!
1767  return true;
1768}
1769
1770MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA,
1771                                            const char *Suffix) const {
1772  return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock(), Suffix);
1773}
1774
1775MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F,
1776                                            const BasicBlock *BB,
1777                                            const char *Suffix) const {
1778  assert(BB->hasName() &&
1779         "Address of anonymous basic block not supported yet!");
1780
1781  // This code must use the function name itself, and not the function number,
1782  // since it must be possible to generate the label name from within other
1783  // functions.
1784  SmallString<60> FnName;
1785  Mang->getNameWithPrefix(FnName, F, false);
1786
1787  // FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME!
1788  SmallString<60> NameResult;
1789  Mang->getNameWithPrefix(NameResult,
1790                          StringRef("BA") + Twine((unsigned)FnName.size()) +
1791                          "_" + FnName.str() + "_" + BB->getName() + Suffix,
1792                          Mangler::Private);
1793
1794  return OutContext.GetOrCreateSymbol(NameResult.str());
1795}
1796
1797MCSymbol *AsmPrinter::GetMBBSymbol(unsigned MBBID) const {
1798  SmallString<60> Name;
1799  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "BB"
1800    << getFunctionNumber() << '_' << MBBID;
1801
1802  return OutContext.GetOrCreateSymbol(Name.str());
1803}
1804
1805/// GetGlobalValueSymbol - Return the MCSymbol for the specified global
1806/// value.
1807MCSymbol *AsmPrinter::GetGlobalValueSymbol(const GlobalValue *GV) const {
1808  SmallString<60> NameStr;
1809  Mang->getNameWithPrefix(NameStr, GV, false);
1810  return OutContext.GetOrCreateSymbol(NameStr.str());
1811}
1812
1813/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
1814/// global value name as its base, with the specified suffix, and where the
1815/// symbol is forced to have private linkage if ForcePrivate is true.
1816MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
1817                                                   StringRef Suffix,
1818                                                   bool ForcePrivate) const {
1819  SmallString<60> NameStr;
1820  Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
1821  NameStr.append(Suffix.begin(), Suffix.end());
1822  return OutContext.GetOrCreateSymbol(NameStr.str());
1823}
1824
1825/// GetExternalSymbolSymbol - Return the MCSymbol for the specified
1826/// ExternalSymbol.
1827MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
1828  SmallString<60> NameStr;
1829  Mang->getNameWithPrefix(NameStr, Sym);
1830  return OutContext.GetOrCreateSymbol(NameStr.str());
1831}
1832
1833
1834/// EmitBasicBlockStart - This method prints the label for the specified
1835/// MachineBasicBlock, an alignment (if present) and a comment describing
1836/// it if appropriate.
1837void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
1838  // Emit an alignment directive for this block, if needed.
1839  if (unsigned Align = MBB->getAlignment())
1840    EmitAlignment(Log2_32(Align));
1841
1842  // If the block has its address taken, emit a special label to satisfy
1843  // references to the block. This is done so that we don't need to
1844  // remember the number of this label, and so that we can make
1845  // forward references to labels without knowing what their numbers
1846  // will be.
1847  if (MBB->hasAddressTaken()) {
1848    O << *GetBlockAddressSymbol(MBB->getBasicBlock()->getParent(),
1849                                MBB->getBasicBlock());
1850    O << ':';
1851    if (VerboseAsm) {
1852      O.PadToColumn(MAI->getCommentColumn());
1853      O << MAI->getCommentString() << " Address Taken";
1854    }
1855    O << '\n';
1856  }
1857
1858  // Print the main label for the block.
1859  if (MBB->pred_empty() || MBB->isOnlyReachableByFallthrough()) {
1860    if (VerboseAsm)
1861      O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':';
1862  } else {
1863    O << *GetMBBSymbol(MBB->getNumber()) << ':';
1864    if (!VerboseAsm)
1865      O << '\n';
1866  }
1867
1868  // Print some comments to accompany the label.
1869  if (VerboseAsm) {
1870    if (const BasicBlock *BB = MBB->getBasicBlock())
1871      if (BB->hasName()) {
1872        O.PadToColumn(MAI->getCommentColumn());
1873        O << MAI->getCommentString() << ' ';
1874        WriteAsOperand(O, BB, /*PrintType=*/false);
1875      }
1876
1877    EmitComments(*MBB);
1878    O << '\n';
1879  }
1880}
1881
1882/// printPICJumpTableSetLabel - This method prints a set label for the
1883/// specified MachineBasicBlock for a jumptable entry.
1884void AsmPrinter::printPICJumpTableSetLabel(unsigned uid,
1885                                           const MachineBasicBlock *MBB) const {
1886  if (!MAI->getSetDirective())
1887    return;
1888
1889  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1890    << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ','
1891    << *GetMBBSymbol(MBB->getNumber())
1892    << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1893    << '_' << uid << '\n';
1894}
1895
1896void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
1897                                           const MachineBasicBlock *MBB) const {
1898  if (!MAI->getSetDirective())
1899    return;
1900
1901  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1902    << getFunctionNumber() << '_' << uid << '_' << uid2
1903    << "_set_" << MBB->getNumber() << ','
1904    << *GetMBBSymbol(MBB->getNumber())
1905    << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1906    << '_' << uid << '_' << uid2 << '\n';
1907}
1908
1909/// printDataDirective - This method prints the asm directive for the
1910/// specified type.
1911void AsmPrinter::printDataDirective(const Type *type, unsigned AddrSpace) {
1912  const TargetData *TD = TM.getTargetData();
1913  switch (type->getTypeID()) {
1914  case Type::FloatTyID: case Type::DoubleTyID:
1915  case Type::X86_FP80TyID: case Type::FP128TyID: case Type::PPC_FP128TyID:
1916    assert(0 && "Should have already output floating point constant.");
1917  default:
1918    assert(0 && "Can't handle printing this type of thing");
1919  case Type::IntegerTyID: {
1920    unsigned BitWidth = cast<IntegerType>(type)->getBitWidth();
1921    if (BitWidth <= 8)
1922      O << MAI->getData8bitsDirective(AddrSpace);
1923    else if (BitWidth <= 16)
1924      O << MAI->getData16bitsDirective(AddrSpace);
1925    else if (BitWidth <= 32)
1926      O << MAI->getData32bitsDirective(AddrSpace);
1927    else if (BitWidth <= 64) {
1928      assert(MAI->getData64bitsDirective(AddrSpace) &&
1929             "Target cannot handle 64-bit constant exprs!");
1930      O << MAI->getData64bitsDirective(AddrSpace);
1931    } else {
1932      llvm_unreachable("Target cannot handle given data directive width!");
1933    }
1934    break;
1935  }
1936  case Type::PointerTyID:
1937    if (TD->getPointerSize() == 8) {
1938      assert(MAI->getData64bitsDirective(AddrSpace) &&
1939             "Target cannot handle 64-bit pointer exprs!");
1940      O << MAI->getData64bitsDirective(AddrSpace);
1941    } else if (TD->getPointerSize() == 2) {
1942      O << MAI->getData16bitsDirective(AddrSpace);
1943    } else if (TD->getPointerSize() == 1) {
1944      O << MAI->getData8bitsDirective(AddrSpace);
1945    } else {
1946      O << MAI->getData32bitsDirective(AddrSpace);
1947    }
1948    break;
1949  }
1950}
1951
1952void AsmPrinter::printVisibility(const MCSymbol *Sym,
1953                                 unsigned Visibility) const {
1954  if (Visibility == GlobalValue::HiddenVisibility) {
1955    if (const char *Directive = MAI->getHiddenDirective())
1956      O << Directive << *Sym << '\n';
1957  } else if (Visibility == GlobalValue::ProtectedVisibility) {
1958    if (const char *Directive = MAI->getProtectedDirective())
1959      O << Directive << *Sym << '\n';
1960  }
1961}
1962
1963void AsmPrinter::printOffset(int64_t Offset) const {
1964  if (Offset > 0)
1965    O << '+' << Offset;
1966  else if (Offset < 0)
1967    O << Offset;
1968}
1969
1970GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1971  if (!S->usesMetadata())
1972    return 0;
1973
1974  gcp_iterator GCPI = GCMetadataPrinters.find(S);
1975  if (GCPI != GCMetadataPrinters.end())
1976    return GCPI->second;
1977
1978  const char *Name = S->getName().c_str();
1979
1980  for (GCMetadataPrinterRegistry::iterator
1981         I = GCMetadataPrinterRegistry::begin(),
1982         E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1983    if (strcmp(Name, I->getName()) == 0) {
1984      GCMetadataPrinter *GMP = I->instantiate();
1985      GMP->S = S;
1986      GCMetadataPrinters.insert(std::make_pair(S, GMP));
1987      return GMP;
1988    }
1989
1990  errs() << "no GCMetadataPrinter registered for GC: " << Name << "\n";
1991  llvm_unreachable(0);
1992}
1993
1994/// EmitComments - Pretty-print comments for instructions
1995void AsmPrinter::EmitComments(const MachineInstr &MI) const {
1996  if (!VerboseAsm)
1997    return;
1998
1999  bool Newline = false;
2000
2001  if (!MI.getDebugLoc().isUnknown()) {
2002    DILocation DLT = MF->getDILocation(MI.getDebugLoc());
2003
2004    // Print source line info.
2005    O.PadToColumn(MAI->getCommentColumn());
2006    O << MAI->getCommentString() << ' ';
2007    DIScope Scope = DLT.getScope();
2008    // Omit the directory, because it's likely to be long and uninteresting.
2009    if (!Scope.isNull())
2010      O << Scope.getFilename();
2011    else
2012      O << "<unknown>";
2013    O << ':' << DLT.getLineNumber();
2014    if (DLT.getColumnNumber() != 0)
2015      O << ':' << DLT.getColumnNumber();
2016    Newline = true;
2017  }
2018
2019  // Check for spills and reloads
2020  int FI;
2021
2022  const MachineFrameInfo *FrameInfo =
2023    MI.getParent()->getParent()->getFrameInfo();
2024
2025  // We assume a single instruction only has a spill or reload, not
2026  // both.
2027  const MachineMemOperand *MMO;
2028  if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
2029    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
2030      MMO = *MI.memoperands_begin();
2031      if (Newline) O << '\n';
2032      O.PadToColumn(MAI->getCommentColumn());
2033      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Reload";
2034      Newline = true;
2035    }
2036  }
2037  else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
2038    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
2039      if (Newline) O << '\n';
2040      O.PadToColumn(MAI->getCommentColumn());
2041      O << MAI->getCommentString() << ' '
2042        << MMO->getSize() << "-byte Folded Reload";
2043      Newline = true;
2044    }
2045  }
2046  else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
2047    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
2048      MMO = *MI.memoperands_begin();
2049      if (Newline) O << '\n';
2050      O.PadToColumn(MAI->getCommentColumn());
2051      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Spill";
2052      Newline = true;
2053    }
2054  }
2055  else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
2056    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
2057      if (Newline) O << '\n';
2058      O.PadToColumn(MAI->getCommentColumn());
2059      O << MAI->getCommentString() << ' '
2060        << MMO->getSize() << "-byte Folded Spill";
2061      Newline = true;
2062    }
2063  }
2064
2065  // Check for spill-induced copies
2066  unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
2067  if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg,
2068                                      SrcSubIdx, DstSubIdx)) {
2069    if (MI.getAsmPrinterFlag(ReloadReuse)) {
2070      if (Newline) O << '\n';
2071      O.PadToColumn(MAI->getCommentColumn());
2072      O << MAI->getCommentString() << " Reload Reuse";
2073    }
2074  }
2075}
2076
2077/// PrintChildLoopComment - Print comments about child loops within
2078/// the loop for this basic block, with nesting.
2079///
2080static void PrintChildLoopComment(formatted_raw_ostream &O,
2081                                  const MachineLoop *loop,
2082                                  const MCAsmInfo *MAI,
2083                                  int FunctionNumber) {
2084  // Add child loop information
2085  for(MachineLoop::iterator cl = loop->begin(),
2086        clend = loop->end();
2087      cl != clend;
2088      ++cl) {
2089    MachineBasicBlock *Header = (*cl)->getHeader();
2090    assert(Header && "No header for loop");
2091
2092    O << '\n';
2093    O.PadToColumn(MAI->getCommentColumn());
2094
2095    O << MAI->getCommentString();
2096    O.indent(((*cl)->getLoopDepth()-1)*2)
2097      << " Child Loop BB" << FunctionNumber << "_"
2098      << Header->getNumber() << " Depth " << (*cl)->getLoopDepth();
2099
2100    PrintChildLoopComment(O, *cl, MAI, FunctionNumber);
2101  }
2102}
2103
2104/// EmitComments - Pretty-print comments for basic blocks
2105void AsmPrinter::EmitComments(const MachineBasicBlock &MBB) const {
2106  if (VerboseAsm) {
2107    // Add loop depth information
2108    const MachineLoop *loop = LI->getLoopFor(&MBB);
2109
2110    if (loop) {
2111      // Print a newline after bb# annotation.
2112      O << "\n";
2113      O.PadToColumn(MAI->getCommentColumn());
2114      O << MAI->getCommentString() << " Loop Depth " << loop->getLoopDepth()
2115        << '\n';
2116
2117      O.PadToColumn(MAI->getCommentColumn());
2118
2119      MachineBasicBlock *Header = loop->getHeader();
2120      assert(Header && "No header for loop");
2121
2122      if (Header == &MBB) {
2123        O << MAI->getCommentString() << " Loop Header";
2124        PrintChildLoopComment(O, loop, MAI, getFunctionNumber());
2125      }
2126      else {
2127        O << MAI->getCommentString() << " Loop Header is BB"
2128          << getFunctionNumber() << "_" << loop->getHeader()->getNumber();
2129      }
2130
2131      if (loop->empty()) {
2132        O << '\n';
2133        O.PadToColumn(MAI->getCommentColumn());
2134        O << MAI->getCommentString() << " Inner Loop";
2135      }
2136
2137      // Add parent loop information
2138      for (const MachineLoop *CurLoop = loop->getParentLoop();
2139           CurLoop;
2140           CurLoop = CurLoop->getParentLoop()) {
2141        MachineBasicBlock *Header = CurLoop->getHeader();
2142        assert(Header && "No header for loop");
2143
2144        O << '\n';
2145        O.PadToColumn(MAI->getCommentColumn());
2146        O << MAI->getCommentString();
2147        O.indent((CurLoop->getLoopDepth()-1)*2)
2148          << " Inside Loop BB" << getFunctionNumber() << "_"
2149          << Header->getNumber() << " Depth " << CurLoop->getLoopDepth();
2150      }
2151    }
2152  }
2153}
2154