AsmPrinter.cpp revision 4ed5438f4882c9fe779b1a8ff546877889b222df 
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    if (GVKind.isCommon()) {
175      // .comm _foo, 42, 4
176      OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
177    } else if (const char *LComm = MAI->getLCOMMDirective()) {
178      // .lcomm _foo, 42, 4
179      O << LComm << *GVSym << ',' << Size;
180      if (MAI->getLCOMMDirectiveTakesAlignment())
181        O << ',' << AlignLog;
182      O << '\n';
183    } else {
184      // .local _foo
185      O << "\t.local\t" << *GVSym << '\n';
186      // .comm _foo, 42, 4
187      OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
188    }
189    return;
190  }
191
192  const MCSection *TheSection =
193    getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
194
195  // Handle the zerofill directive on darwin, which is a special form of BSS
196  // emission.
197  if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
198    // .globl _foo
199    OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
200    // .zerofill __DATA, __common, _foo, 400, 5
201    OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
202    return;
203  }
204
205  OutStreamer.SwitchSection(TheSection);
206
207  // TODO: Factor into an 'emit linkage' thing that is shared with function
208  // bodies.
209  switch (GV->getLinkage()) {
210  case GlobalValue::CommonLinkage:
211  case GlobalValue::LinkOnceAnyLinkage:
212  case GlobalValue::LinkOnceODRLinkage:
213  case GlobalValue::WeakAnyLinkage:
214  case GlobalValue::WeakODRLinkage:
215  case GlobalValue::LinkerPrivateLinkage:
216    if (const char *WeakDef = MAI->getWeakDefDirective()) {
217      // .globl _foo
218      OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
219      // .weak_definition _foo
220      O << WeakDef << *GVSym << '\n';
221    } else if (const char *LinkOnce = MAI->getLinkOnceDirective()) {
222      // .globl _foo
223      OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
224      // .linkonce same_size
225      O << LinkOnce;
226    } else
227      O << "\t.weak\t" << *GVSym << '\n';
228    break;
229  case GlobalValue::DLLExportLinkage:
230  case GlobalValue::AppendingLinkage:
231    // FIXME: appending linkage variables should go into a section of
232    // their name or something.  For now, just emit them as external.
233  case GlobalValue::ExternalLinkage:
234    // If external or appending, declare as a global symbol.
235    // .globl _foo
236    OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
237    break;
238  case GlobalValue::PrivateLinkage:
239  case GlobalValue::InternalLinkage:
240     break;
241  default:
242    llvm_unreachable("Unknown linkage type!");
243  }
244
245  EmitAlignment(AlignLog, GV);
246  O << *GVSym << ":";
247  if (VerboseAsm) {
248    O.PadToColumn(MAI->getCommentColumn());
249    O << MAI->getCommentString() << ' ';
250    WriteAsOperand(O, GV, /*PrintType=*/false, GV->getParent());
251  }
252  O << '\n';
253
254  EmitGlobalConstant(GV->getInitializer());
255
256  if (MAI->hasDotTypeDotSizeDirective())
257    O << "\t.size\t" << *GVSym << ", " << Size << '\n';
258}
259
260
261bool AsmPrinter::doFinalization(Module &M) {
262  // Emit global variables.
263  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
264       I != E; ++I)
265    EmitGlobalVariable(I);
266
267  // Emit final debug information.
268  if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
269    DW->EndModule();
270
271  // If the target wants to know about weak references, print them all.
272  if (MAI->getWeakRefDirective()) {
273    // FIXME: This is not lazy, it would be nice to only print weak references
274    // to stuff that is actually used.  Note that doing so would require targets
275    // to notice uses in operands (due to constant exprs etc).  This should
276    // happen with the MC stuff eventually.
277
278    // Print out module-level global variables here.
279    for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
280         I != E; ++I) {
281      if (!I->hasExternalWeakLinkage()) continue;
282      O << MAI->getWeakRefDirective() << *GetGlobalValueSymbol(I) << '\n';
283    }
284
285    for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
286      if (!I->hasExternalWeakLinkage()) continue;
287      O << MAI->getWeakRefDirective() << *GetGlobalValueSymbol(I) << '\n';
288    }
289  }
290
291  if (MAI->getSetDirective()) {
292    O << '\n';
293    for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
294         I != E; ++I) {
295      MCSymbol *Name = GetGlobalValueSymbol(I);
296
297      const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
298      MCSymbol *Target = GetGlobalValueSymbol(GV);
299
300      if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
301        O << "\t.globl\t" << *Name << '\n';
302      else if (I->hasWeakLinkage())
303        O << MAI->getWeakRefDirective() << *Name << '\n';
304      else
305        assert(I->hasLocalLinkage() && "Invalid alias linkage");
306
307      printVisibility(Name, I->getVisibility());
308
309      O << MAI->getSetDirective() << ' ' << *Name << ", " << *Target << '\n';
310    }
311  }
312
313  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
314  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
315  for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
316    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
317      MP->finishAssembly(O, *this, *MAI);
318
319  // If we don't have any trampolines, then we don't require stack memory
320  // to be executable. Some targets have a directive to declare this.
321  Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
322  if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
323    if (MAI->getNonexecutableStackDirective())
324      O << MAI->getNonexecutableStackDirective() << '\n';
325
326
327  // Allow the target to emit any magic that it wants at the end of the file,
328  // after everything else has gone out.
329  EmitEndOfAsmFile(M);
330
331  delete Mang; Mang = 0;
332  DW = 0; MMI = 0;
333
334  OutStreamer.Finish();
335  return false;
336}
337
338void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
339  // Get the function symbol.
340  CurrentFnSym = GetGlobalValueSymbol(MF.getFunction());
341  IncrementFunctionNumber();
342
343  if (VerboseAsm)
344    LI = &getAnalysis<MachineLoopInfo>();
345}
346
347namespace {
348  // SectionCPs - Keep track the alignment, constpool entries per Section.
349  struct SectionCPs {
350    const MCSection *S;
351    unsigned Alignment;
352    SmallVector<unsigned, 4> CPEs;
353    SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
354  };
355}
356
357/// EmitConstantPool - Print to the current output stream assembly
358/// representations of the constants in the constant pool MCP. This is
359/// used to print out constants which have been "spilled to memory" by
360/// the code generator.
361///
362void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
363  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
364  if (CP.empty()) return;
365
366  // Calculate sections for constant pool entries. We collect entries to go into
367  // the same section together to reduce amount of section switch statements.
368  SmallVector<SectionCPs, 4> CPSections;
369  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
370    const MachineConstantPoolEntry &CPE = CP[i];
371    unsigned Align = CPE.getAlignment();
372
373    SectionKind Kind;
374    switch (CPE.getRelocationInfo()) {
375    default: llvm_unreachable("Unknown section kind");
376    case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
377    case 1:
378      Kind = SectionKind::getReadOnlyWithRelLocal();
379      break;
380    case 0:
381    switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
382    case 4:  Kind = SectionKind::getMergeableConst4(); break;
383    case 8:  Kind = SectionKind::getMergeableConst8(); break;
384    case 16: Kind = SectionKind::getMergeableConst16();break;
385    default: Kind = SectionKind::getMergeableConst(); break;
386    }
387    }
388
389    const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
390
391    // The number of sections are small, just do a linear search from the
392    // last section to the first.
393    bool Found = false;
394    unsigned SecIdx = CPSections.size();
395    while (SecIdx != 0) {
396      if (CPSections[--SecIdx].S == S) {
397        Found = true;
398        break;
399      }
400    }
401    if (!Found) {
402      SecIdx = CPSections.size();
403      CPSections.push_back(SectionCPs(S, Align));
404    }
405
406    if (Align > CPSections[SecIdx].Alignment)
407      CPSections[SecIdx].Alignment = Align;
408    CPSections[SecIdx].CPEs.push_back(i);
409  }
410
411  // Now print stuff into the calculated sections.
412  for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
413    OutStreamer.SwitchSection(CPSections[i].S);
414    EmitAlignment(Log2_32(CPSections[i].Alignment));
415
416    unsigned Offset = 0;
417    for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
418      unsigned CPI = CPSections[i].CPEs[j];
419      MachineConstantPoolEntry CPE = CP[CPI];
420
421      // Emit inter-object padding for alignment.
422      unsigned AlignMask = CPE.getAlignment() - 1;
423      unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
424      EmitZeros(NewOffset - Offset);
425
426      const Type *Ty = CPE.getType();
427      Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
428
429      O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
430        << CPI << ':';
431      if (VerboseAsm) {
432        O.PadToColumn(MAI->getCommentColumn());
433        O << MAI->getCommentString() << " constant ";
434        WriteTypeSymbolic(O, CPE.getType(), MF->getFunction()->getParent());
435      }
436      O << '\n';
437      if (CPE.isMachineConstantPoolEntry())
438        EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
439      else
440        EmitGlobalConstant(CPE.Val.ConstVal);
441    }
442  }
443}
444
445/// EmitJumpTableInfo - Print assembly representations of the jump tables used
446/// by the current function to the current output stream.
447///
448void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
449                                   MachineFunction &MF) {
450  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
451  if (JT.empty()) return;
452
453  bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
454
455  // Pick the directive to use to print the jump table entries, and switch to
456  // the appropriate section.
457  TargetLowering *LoweringInfo = TM.getTargetLowering();
458
459  const Function *F = MF.getFunction();
460  bool JTInDiffSection = false;
461  if (F->isWeakForLinker() ||
462      (IsPic && !LoweringInfo->usesGlobalOffsetTable())) {
463    // In PIC mode, we need to emit the jump table to the same section as the
464    // function body itself, otherwise the label differences won't make sense.
465    // We should also do if the section name is NULL or function is declared in
466    // discardable section.
467    OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang,
468                                                                    TM));
469  } else {
470    // Otherwise, drop it in the readonly section.
471    const MCSection *ReadOnlySection =
472      getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
473    OutStreamer.SwitchSection(ReadOnlySection);
474    JTInDiffSection = true;
475  }
476
477  EmitAlignment(Log2_32(MJTI->getAlignment()));
478
479  for (unsigned i = 0, e = JT.size(); i != e; ++i) {
480    const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
481
482    // If this jump table was deleted, ignore it.
483    if (JTBBs.empty()) continue;
484
485    // For PIC codegen, if possible we want to use the SetDirective to reduce
486    // the number of relocations the assembler will generate for the jump table.
487    // Set directives are all printed before the jump table itself.
488    SmallPtrSet<MachineBasicBlock*, 16> EmittedSets;
489    if (MAI->getSetDirective() && IsPic)
490      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
491        if (EmittedSets.insert(JTBBs[ii]))
492          printPICJumpTableSetLabel(i, JTBBs[ii]);
493
494    // On some targets (e.g. Darwin) we want to emit two consequtive labels
495    // before each jump table.  The first label is never referenced, but tells
496    // the assembler and linker the extents of the jump table object.  The
497    // second label is actually referenced by the code.
498    if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0]) {
499      O << MAI->getLinkerPrivateGlobalPrefix()
500        << "JTI" << getFunctionNumber() << '_' << i << ":\n";
501    }
502
503    O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
504      << '_' << i << ":\n";
505
506    for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
507      printPICJumpTableEntry(MJTI, JTBBs[ii], i);
508      O << '\n';
509    }
510  }
511}
512
513void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
514                                        const MachineBasicBlock *MBB,
515                                        unsigned uid)  const {
516  bool isPIC = TM.getRelocationModel() == Reloc::PIC_;
517
518  // Use JumpTableDirective otherwise honor the entry size from the jump table
519  // info.
520  const char *JTEntryDirective = MAI->getJumpTableDirective(isPIC);
521  bool HadJTEntryDirective = JTEntryDirective != NULL;
522  if (!HadJTEntryDirective) {
523    JTEntryDirective = MJTI->getEntrySize() == 4 ?
524      MAI->getData32bitsDirective() : MAI->getData64bitsDirective();
525  }
526
527  O << JTEntryDirective << ' ';
528
529  // If we have emitted set directives for the jump table entries, print
530  // them rather than the entries themselves.  If we're emitting PIC, then
531  // emit the table entries as differences between two text section labels.
532  // If we're emitting non-PIC code, then emit the entries as direct
533  // references to the target basic blocks.
534  if (!isPIC) {
535    O << *GetMBBSymbol(MBB->getNumber());
536  } else if (MAI->getSetDirective()) {
537    O << MAI->getPrivateGlobalPrefix() << getFunctionNumber()
538      << '_' << uid << "_set_" << MBB->getNumber();
539  } else {
540    O << *GetMBBSymbol(MBB->getNumber());
541    // If the arch uses custom Jump Table directives, don't calc relative to
542    // JT
543    if (!HadJTEntryDirective)
544      O << '-' << MAI->getPrivateGlobalPrefix() << "JTI"
545        << getFunctionNumber() << '_' << uid;
546  }
547}
548
549
550/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
551/// special global used by LLVM.  If so, emit it and return true, otherwise
552/// do nothing and return false.
553bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
554  if (GV->getName() == "llvm.used") {
555    if (MAI->getUsedDirective() != 0)    // No need to emit this at all.
556      EmitLLVMUsedList(GV->getInitializer());
557    return true;
558  }
559
560  // Ignore debug and non-emitted data.  This handles llvm.compiler.used.
561  if (GV->getSection() == "llvm.metadata" ||
562      GV->hasAvailableExternallyLinkage())
563    return true;
564
565  if (!GV->hasAppendingLinkage()) return false;
566
567  assert(GV->hasInitializer() && "Not a special LLVM global!");
568
569  const TargetData *TD = TM.getTargetData();
570  unsigned Align = Log2_32(TD->getPointerPrefAlignment());
571  if (GV->getName() == "llvm.global_ctors") {
572    OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
573    EmitAlignment(Align, 0);
574    EmitXXStructorList(GV->getInitializer());
575
576    if (TM.getRelocationModel() == Reloc::Static &&
577        MAI->hasStaticCtorDtorReferenceInStaticMode())
578      O << ".reference .constructors_used\n";
579    return true;
580  }
581
582  if (GV->getName() == "llvm.global_dtors") {
583    OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
584    EmitAlignment(Align, 0);
585    EmitXXStructorList(GV->getInitializer());
586
587    if (TM.getRelocationModel() == Reloc::Static &&
588        MAI->hasStaticCtorDtorReferenceInStaticMode())
589      O << ".reference .destructors_used\n";
590    return true;
591  }
592
593  return false;
594}
595
596/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
597/// global in the specified llvm.used list for which emitUsedDirectiveFor
598/// is true, as being used with this directive.
599void AsmPrinter::EmitLLVMUsedList(Constant *List) {
600  const char *Directive = MAI->getUsedDirective();
601
602  // Should be an array of 'i8*'.
603  ConstantArray *InitList = dyn_cast<ConstantArray>(List);
604  if (InitList == 0) return;
605
606  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
607    const GlobalValue *GV =
608      dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
609    if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang)) {
610      O << Directive;
611      EmitConstantValueOnly(InitList->getOperand(i));
612      O << '\n';
613    }
614  }
615}
616
617/// EmitXXStructorList - Emit the ctor or dtor list.  This just prints out the
618/// function pointers, ignoring the init priority.
619void AsmPrinter::EmitXXStructorList(Constant *List) {
620  // Should be an array of '{ int, void ()* }' structs.  The first value is the
621  // init priority, which we ignore.
622  if (!isa<ConstantArray>(List)) return;
623  ConstantArray *InitList = cast<ConstantArray>(List);
624  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
625    if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
626      if (CS->getNumOperands() != 2) return;  // Not array of 2-element structs.
627
628      if (CS->getOperand(1)->isNullValue())
629        return;  // Found a null terminator, exit printing.
630      // Emit the function pointer.
631      EmitGlobalConstant(CS->getOperand(1));
632    }
633}
634
635
636//===----------------------------------------------------------------------===//
637/// LEB 128 number encoding.
638
639/// PrintULEB128 - Print a series of hexadecimal values (separated by commas)
640/// representing an unsigned leb128 value.
641void AsmPrinter::PrintULEB128(unsigned Value) const {
642  do {
643    unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
644    Value >>= 7;
645    if (Value) Byte |= 0x80;
646    PrintHex(Byte);
647    if (Value) O << ", ";
648  } while (Value);
649}
650
651/// PrintSLEB128 - Print a series of hexadecimal values (separated by commas)
652/// representing a signed leb128 value.
653void AsmPrinter::PrintSLEB128(int Value) const {
654  int Sign = Value >> (8 * sizeof(Value) - 1);
655  bool IsMore;
656
657  do {
658    unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
659    Value >>= 7;
660    IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
661    if (IsMore) Byte |= 0x80;
662    PrintHex(Byte);
663    if (IsMore) O << ", ";
664  } while (IsMore);
665}
666
667//===--------------------------------------------------------------------===//
668// Emission and print routines
669//
670
671/// PrintHex - Print a value as a hexadecimal value.
672///
673void AsmPrinter::PrintHex(uint64_t Value) const {
674  O << "0x";
675  O.write_hex(Value);
676}
677
678/// EOL - Print a newline character to asm stream.  If a comment is present
679/// then it will be printed first.  Comments should not contain '\n'.
680void AsmPrinter::EOL() const {
681  O << '\n';
682}
683
684void AsmPrinter::EOL(const Twine &Comment) const {
685  if (VerboseAsm && !Comment.isTriviallyEmpty()) {
686    O.PadToColumn(MAI->getCommentColumn());
687    O << MAI->getCommentString()
688      << ' '
689      << Comment;
690  }
691  O << '\n';
692}
693
694static const char *DecodeDWARFEncoding(unsigned Encoding) {
695  switch (Encoding) {
696  case dwarf::DW_EH_PE_absptr:
697    return "absptr";
698  case dwarf::DW_EH_PE_omit:
699    return "omit";
700  case dwarf::DW_EH_PE_pcrel:
701    return "pcrel";
702  case dwarf::DW_EH_PE_udata4:
703    return "udata4";
704  case dwarf::DW_EH_PE_udata8:
705    return "udata8";
706  case dwarf::DW_EH_PE_sdata4:
707    return "sdata4";
708  case dwarf::DW_EH_PE_sdata8:
709    return "sdata8";
710  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4:
711    return "pcrel udata4";
712  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4:
713    return "pcrel sdata4";
714  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8:
715    return "pcrel udata8";
716  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8:
717    return "pcrel sdata8";
718  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata4:
719    return "indirect pcrel udata4";
720  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata4:
721    return "indirect pcrel sdata4";
722  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata8:
723    return "indirect pcrel udata8";
724  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata8:
725    return "indirect pcrel sdata8";
726  }
727
728  return 0;
729}
730
731void AsmPrinter::EOL(const Twine &Comment, unsigned Encoding) const {
732  if (VerboseAsm && !Comment.isTriviallyEmpty()) {
733    O.PadToColumn(MAI->getCommentColumn());
734    O << MAI->getCommentString()
735      << ' '
736      << Comment;
737
738    if (const char *EncStr = DecodeDWARFEncoding(Encoding))
739      O << " (" << EncStr << ')';
740  }
741  O << '\n';
742}
743
744/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
745/// unsigned leb128 value.
746void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
747  if (MAI->hasLEB128()) {
748    O << "\t.uleb128\t"
749      << Value;
750  } else {
751    O << MAI->getData8bitsDirective();
752    PrintULEB128(Value);
753  }
754}
755
756/// EmitSLEB128Bytes - print an assembler byte data directive to compose a
757/// signed leb128 value.
758void AsmPrinter::EmitSLEB128Bytes(int Value) const {
759  if (MAI->hasLEB128()) {
760    O << "\t.sleb128\t"
761      << Value;
762  } else {
763    O << MAI->getData8bitsDirective();
764    PrintSLEB128(Value);
765  }
766}
767
768/// EmitInt8 - Emit a byte directive and value.
769///
770void AsmPrinter::EmitInt8(int Value) const {
771  O << MAI->getData8bitsDirective();
772  PrintHex(Value & 0xFF);
773}
774
775/// EmitInt16 - Emit a short directive and value.
776///
777void AsmPrinter::EmitInt16(int Value) const {
778  O << MAI->getData16bitsDirective();
779  PrintHex(Value & 0xFFFF);
780}
781
782/// EmitInt32 - Emit a long directive and value.
783///
784void AsmPrinter::EmitInt32(int Value) const {
785  O << MAI->getData32bitsDirective();
786  PrintHex(Value);
787}
788
789/// EmitInt64 - Emit a long long directive and value.
790///
791void AsmPrinter::EmitInt64(uint64_t Value) const {
792  if (MAI->getData64bitsDirective()) {
793    O << MAI->getData64bitsDirective();
794    PrintHex(Value);
795  } else {
796    if (TM.getTargetData()->isBigEndian()) {
797      EmitInt32(unsigned(Value >> 32)); O << '\n';
798      EmitInt32(unsigned(Value));
799    } else {
800      EmitInt32(unsigned(Value)); O << '\n';
801      EmitInt32(unsigned(Value >> 32));
802    }
803  }
804}
805
806/// toOctal - Convert the low order bits of X into an octal digit.
807///
808static inline char toOctal(int X) {
809  return (X&7)+'0';
810}
811
812/// printStringChar - Print a char, escaped if necessary.
813///
814static void printStringChar(formatted_raw_ostream &O, unsigned char C) {
815  if (C == '"') {
816    O << "\\\"";
817  } else if (C == '\\') {
818    O << "\\\\";
819  } else if (isprint((unsigned char)C)) {
820    O << C;
821  } else {
822    switch(C) {
823    case '\b': O << "\\b"; break;
824    case '\f': O << "\\f"; break;
825    case '\n': O << "\\n"; break;
826    case '\r': O << "\\r"; break;
827    case '\t': O << "\\t"; break;
828    default:
829      O << '\\';
830      O << toOctal(C >> 6);
831      O << toOctal(C >> 3);
832      O << toOctal(C >> 0);
833      break;
834    }
835  }
836}
837
838/// EmitString - Emit a string with quotes and a null terminator.
839/// Special characters are emitted properly.
840/// \literal (Eg. '\t') \endliteral
841void AsmPrinter::EmitString(const StringRef String) const {
842  EmitString(String.data(), String.size());
843}
844
845void AsmPrinter::EmitString(const char *String, unsigned Size) const {
846  const char* AscizDirective = MAI->getAscizDirective();
847  if (AscizDirective)
848    O << AscizDirective;
849  else
850    O << MAI->getAsciiDirective();
851  O << '\"';
852  for (unsigned i = 0; i < Size; ++i)
853    printStringChar(O, String[i]);
854  if (AscizDirective)
855    O << '\"';
856  else
857    O << "\\0\"";
858}
859
860
861/// EmitFile - Emit a .file directive.
862void AsmPrinter::EmitFile(unsigned Number, StringRef Name) const {
863  O << "\t.file\t" << Number << " \"";
864  for (unsigned i = 0, N = Name.size(); i < N; ++i)
865    printStringChar(O, Name[i]);
866  O << '\"';
867}
868
869
870//===----------------------------------------------------------------------===//
871
872// EmitAlignment - Emit an alignment directive to the specified power of
873// two boundary.  For example, if you pass in 3 here, you will get an 8
874// byte alignment.  If a global value is specified, and if that global has
875// an explicit alignment requested, it will unconditionally override the
876// alignment request.  However, if ForcedAlignBits is specified, this value
877// has final say: the ultimate alignment will be the max of ForcedAlignBits
878// and the alignment computed with NumBits and the global.
879//
880// The algorithm is:
881//     Align = NumBits;
882//     if (GV && GV->hasalignment) Align = GV->getalignment();
883//     Align = std::max(Align, ForcedAlignBits);
884//
885void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
886                               unsigned ForcedAlignBits,
887                               bool UseFillExpr) const {
888  if (GV && GV->getAlignment())
889    NumBits = Log2_32(GV->getAlignment());
890  NumBits = std::max(NumBits, ForcedAlignBits);
891
892  if (NumBits == 0) return;   // No need to emit alignment.
893
894  unsigned FillValue = 0;
895  if (getCurrentSection()->getKind().isText())
896    FillValue = MAI->getTextAlignFillValue();
897
898  OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0);
899}
900
901/// EmitZeros - Emit a block of zeros.
902///
903void AsmPrinter::EmitZeros(uint64_t NumZeros, unsigned AddrSpace) const {
904  if (NumZeros) {
905    if (MAI->getZeroDirective()) {
906      O << MAI->getZeroDirective() << NumZeros;
907      if (MAI->getZeroDirectiveSuffix())
908        O << MAI->getZeroDirectiveSuffix();
909      O << '\n';
910    } else {
911      for (; NumZeros; --NumZeros)
912        O << MAI->getData8bitsDirective(AddrSpace) << "0\n";
913    }
914  }
915}
916
917// Print out the specified constant, without a storage class.  Only the
918// constants valid in constant expressions can occur here.
919void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
920  if (CV->isNullValue() || isa<UndefValue>(CV)) {
921    O << '0';
922    return;
923  }
924
925  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
926    O << CI->getZExtValue();
927    return;
928  }
929
930  if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
931    // This is a constant address for a global variable or function. Use the
932    // name of the variable or function as the address value.
933    O << *GetGlobalValueSymbol(GV);
934    return;
935  }
936
937  if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV)) {
938    O << *GetBlockAddressSymbol(BA);
939    return;
940  }
941
942  const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
943  if (CE == 0) {
944    llvm_unreachable("Unknown constant value!");
945    O << '0';
946    return;
947  }
948
949  switch (CE->getOpcode()) {
950  case Instruction::ZExt:
951  case Instruction::SExt:
952  case Instruction::FPTrunc:
953  case Instruction::FPExt:
954  case Instruction::UIToFP:
955  case Instruction::SIToFP:
956  case Instruction::FPToUI:
957  case Instruction::FPToSI:
958  default:
959    llvm_unreachable("FIXME: Don't support this constant cast expr");
960  case Instruction::GetElementPtr: {
961    // generate a symbolic expression for the byte address
962    const TargetData *TD = TM.getTargetData();
963    const Constant *ptrVal = CE->getOperand(0);
964    SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
965    int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
966                                          idxVec.size());
967    if (Offset == 0)
968      return EmitConstantValueOnly(ptrVal);
969
970    // Truncate/sext the offset to the pointer size.
971    if (TD->getPointerSizeInBits() != 64) {
972      int SExtAmount = 64-TD->getPointerSizeInBits();
973      Offset = (Offset << SExtAmount) >> SExtAmount;
974    }
975
976    if (Offset)
977      O << '(';
978    EmitConstantValueOnly(ptrVal);
979    if (Offset > 0)
980      O << ") + " << Offset;
981    else
982      O << ") - " << -Offset;
983    return;
984  }
985  case Instruction::BitCast:
986    return EmitConstantValueOnly(CE->getOperand(0));
987
988  case Instruction::IntToPtr: {
989    // Handle casts to pointers by changing them into casts to the appropriate
990    // integer type.  This promotes constant folding and simplifies this code.
991    const TargetData *TD = TM.getTargetData();
992    Constant *Op = CE->getOperand(0);
993    Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(CV->getContext()),
994                                      false/*ZExt*/);
995    return EmitConstantValueOnly(Op);
996  }
997
998  case Instruction::PtrToInt: {
999    // Support only foldable casts to/from pointers that can be eliminated by
1000    // changing the pointer to the appropriately sized integer type.
1001    Constant *Op = CE->getOperand(0);
1002    const Type *Ty = CE->getType();
1003    const TargetData *TD = TM.getTargetData();
1004
1005    // We can emit the pointer value into this slot if the slot is an
1006    // integer slot greater or equal to the size of the pointer.
1007    if (TD->getTypeAllocSize(Ty) == TD->getTypeAllocSize(Op->getType()))
1008      return EmitConstantValueOnly(Op);
1009
1010    O << "((";
1011    EmitConstantValueOnly(Op);
1012    APInt ptrMask =
1013      APInt::getAllOnesValue(TD->getTypeAllocSizeInBits(Op->getType()));
1014
1015    SmallString<40> S;
1016    ptrMask.toStringUnsigned(S);
1017    O << ") & " << S.str() << ')';
1018    return;
1019  }
1020
1021  case Instruction::Trunc:
1022    // We emit the value and depend on the assembler to truncate the generated
1023    // expression properly.  This is important for differences between
1024    // blockaddress labels.  Since the two labels are in the same function, it
1025    // is reasonable to treat their delta as a 32-bit value.
1026    return EmitConstantValueOnly(CE->getOperand(0));
1027
1028  case Instruction::Add:
1029  case Instruction::Sub:
1030  case Instruction::And:
1031  case Instruction::Or:
1032  case Instruction::Xor:
1033    O << '(';
1034    EmitConstantValueOnly(CE->getOperand(0));
1035    O << ')';
1036    switch (CE->getOpcode()) {
1037    case Instruction::Add:
1038     O << " + ";
1039     break;
1040    case Instruction::Sub:
1041     O << " - ";
1042     break;
1043    case Instruction::And:
1044     O << " & ";
1045     break;
1046    case Instruction::Or:
1047     O << " | ";
1048     break;
1049    case Instruction::Xor:
1050     O << " ^ ";
1051     break;
1052    default:
1053     break;
1054    }
1055    O << '(';
1056    EmitConstantValueOnly(CE->getOperand(1));
1057    O << ')';
1058    break;
1059  }
1060}
1061
1062/// printAsCString - Print the specified array as a C compatible string, only if
1063/// the predicate isString is true.
1064///
1065static void printAsCString(formatted_raw_ostream &O, const ConstantArray *CVA,
1066                           unsigned LastElt) {
1067  assert(CVA->isString() && "Array is not string compatible!");
1068
1069  O << '\"';
1070  for (unsigned i = 0; i != LastElt; ++i) {
1071    unsigned char C =
1072        (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
1073    printStringChar(O, C);
1074  }
1075  O << '\"';
1076}
1077
1078/// EmitString - Emit a zero-byte-terminated string constant.
1079///
1080void AsmPrinter::EmitString(const ConstantArray *CVA) const {
1081  unsigned NumElts = CVA->getNumOperands();
1082  if (MAI->getAscizDirective() && NumElts &&
1083      cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
1084    O << MAI->getAscizDirective();
1085    printAsCString(O, CVA, NumElts-1);
1086  } else {
1087    O << MAI->getAsciiDirective();
1088    printAsCString(O, CVA, NumElts);
1089  }
1090  O << '\n';
1091}
1092
1093void AsmPrinter::EmitGlobalConstantArray(const ConstantArray *CVA,
1094                                         unsigned AddrSpace) {
1095  if (CVA->isString()) {
1096    EmitString(CVA);
1097  } else { // Not a string.  Print the values in successive locations
1098    for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
1099      EmitGlobalConstant(CVA->getOperand(i), AddrSpace);
1100  }
1101}
1102
1103void AsmPrinter::EmitGlobalConstantVector(const ConstantVector *CP) {
1104  const VectorType *PTy = CP->getType();
1105
1106  for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
1107    EmitGlobalConstant(CP->getOperand(I));
1108}
1109
1110void AsmPrinter::EmitGlobalConstantStruct(const ConstantStruct *CVS,
1111                                          unsigned AddrSpace) {
1112  // Print the fields in successive locations. Pad to align if needed!
1113  const TargetData *TD = TM.getTargetData();
1114  unsigned Size = TD->getTypeAllocSize(CVS->getType());
1115  const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
1116  uint64_t sizeSoFar = 0;
1117  for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
1118    const Constant* field = CVS->getOperand(i);
1119
1120    // Check if padding is needed and insert one or more 0s.
1121    uint64_t fieldSize = TD->getTypeAllocSize(field->getType());
1122    uint64_t padSize = ((i == e-1 ? Size : cvsLayout->getElementOffset(i+1))
1123                        - cvsLayout->getElementOffset(i)) - fieldSize;
1124    sizeSoFar += fieldSize + padSize;
1125
1126    // Now print the actual field value.
1127    EmitGlobalConstant(field, AddrSpace);
1128
1129    // Insert padding - this may include padding to increase the size of the
1130    // current field up to the ABI size (if the struct is not packed) as well
1131    // as padding to ensure that the next field starts at the right offset.
1132    EmitZeros(padSize, AddrSpace);
1133  }
1134  assert(sizeSoFar == cvsLayout->getSizeInBytes() &&
1135         "Layout of constant struct may be incorrect!");
1136}
1137
1138void AsmPrinter::EmitGlobalConstantFP(const ConstantFP *CFP,
1139                                      unsigned AddrSpace) {
1140  // FP Constants are printed as integer constants to avoid losing
1141  // precision...
1142  LLVMContext &Context = CFP->getContext();
1143  const TargetData *TD = TM.getTargetData();
1144  if (CFP->getType()->isDoubleTy()) {
1145    double Val = CFP->getValueAPF().convertToDouble();  // for comment only
1146    uint64_t i = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1147    if (MAI->getData64bitsDirective(AddrSpace)) {
1148      O << MAI->getData64bitsDirective(AddrSpace) << i;
1149      if (VerboseAsm) {
1150        O.PadToColumn(MAI->getCommentColumn());
1151        O << MAI->getCommentString() << " double " << Val;
1152      }
1153      O << '\n';
1154    } else if (TD->isBigEndian()) {
1155      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1156      if (VerboseAsm) {
1157        O.PadToColumn(MAI->getCommentColumn());
1158        O << MAI->getCommentString()
1159          << " most significant word of double " << Val;
1160      }
1161      O << '\n';
1162      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1163      if (VerboseAsm) {
1164        O.PadToColumn(MAI->getCommentColumn());
1165        O << MAI->getCommentString()
1166          << " least significant word of double " << Val;
1167      }
1168      O << '\n';
1169    } else {
1170      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1171      if (VerboseAsm) {
1172        O.PadToColumn(MAI->getCommentColumn());
1173        O << MAI->getCommentString()
1174          << " least significant word of double " << Val;
1175      }
1176      O << '\n';
1177      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1178      if (VerboseAsm) {
1179        O.PadToColumn(MAI->getCommentColumn());
1180        O << MAI->getCommentString()
1181          << " most significant word of double " << Val;
1182      }
1183      O << '\n';
1184    }
1185    return;
1186  }
1187
1188  if (CFP->getType()->isFloatTy()) {
1189    float Val = CFP->getValueAPF().convertToFloat();  // for comment only
1190    O << MAI->getData32bitsDirective(AddrSpace)
1191      << CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1192    if (VerboseAsm) {
1193      O.PadToColumn(MAI->getCommentColumn());
1194      O << MAI->getCommentString() << " float " << Val;
1195    }
1196    O << '\n';
1197    return;
1198  }
1199
1200  if (CFP->getType()->isX86_FP80Ty()) {
1201    // all long double variants are printed as hex
1202    // api needed to prevent premature destruction
1203    APInt api = CFP->getValueAPF().bitcastToAPInt();
1204    const uint64_t *p = api.getRawData();
1205    // Convert to double so we can print the approximate val as a comment.
1206    APFloat DoubleVal = CFP->getValueAPF();
1207    bool ignored;
1208    DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1209                      &ignored);
1210    if (TD->isBigEndian()) {
1211      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1212      if (VerboseAsm) {
1213        O.PadToColumn(MAI->getCommentColumn());
1214        O << MAI->getCommentString()
1215          << " most significant halfword of x86_fp80 ~"
1216          << DoubleVal.convertToDouble();
1217      }
1218      O << '\n';
1219      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1220      if (VerboseAsm) {
1221        O.PadToColumn(MAI->getCommentColumn());
1222        O << MAI->getCommentString() << " next halfword";
1223      }
1224      O << '\n';
1225      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1226      if (VerboseAsm) {
1227        O.PadToColumn(MAI->getCommentColumn());
1228        O << MAI->getCommentString() << " next halfword";
1229      }
1230      O << '\n';
1231      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1232      if (VerboseAsm) {
1233        O.PadToColumn(MAI->getCommentColumn());
1234        O << MAI->getCommentString() << " next halfword";
1235      }
1236      O << '\n';
1237      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1238      if (VerboseAsm) {
1239        O.PadToColumn(MAI->getCommentColumn());
1240        O << MAI->getCommentString()
1241          << " least significant halfword";
1242      }
1243      O << '\n';
1244     } else {
1245      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1246      if (VerboseAsm) {
1247        O.PadToColumn(MAI->getCommentColumn());
1248        O << MAI->getCommentString()
1249          << " least significant halfword of x86_fp80 ~"
1250          << DoubleVal.convertToDouble();
1251      }
1252      O << '\n';
1253      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1254      if (VerboseAsm) {
1255        O.PadToColumn(MAI->getCommentColumn());
1256        O << MAI->getCommentString()
1257          << " next halfword";
1258      }
1259      O << '\n';
1260      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1261      if (VerboseAsm) {
1262        O.PadToColumn(MAI->getCommentColumn());
1263        O << MAI->getCommentString()
1264          << " next halfword";
1265      }
1266      O << '\n';
1267      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1268      if (VerboseAsm) {
1269        O.PadToColumn(MAI->getCommentColumn());
1270        O << MAI->getCommentString()
1271          << " next halfword";
1272      }
1273      O << '\n';
1274      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1275      if (VerboseAsm) {
1276        O.PadToColumn(MAI->getCommentColumn());
1277        O << MAI->getCommentString()
1278          << " most significant halfword";
1279      }
1280      O << '\n';
1281    }
1282    EmitZeros(TD->getTypeAllocSize(Type::getX86_FP80Ty(Context)) -
1283              TD->getTypeStoreSize(Type::getX86_FP80Ty(Context)), AddrSpace);
1284    return;
1285  }
1286
1287  if (CFP->getType()->isPPC_FP128Ty()) {
1288    // all long double variants are printed as hex
1289    // api needed to prevent premature destruction
1290    APInt api = CFP->getValueAPF().bitcastToAPInt();
1291    const uint64_t *p = api.getRawData();
1292    if (TD->isBigEndian()) {
1293      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1294      if (VerboseAsm) {
1295        O.PadToColumn(MAI->getCommentColumn());
1296        O << MAI->getCommentString()
1297          << " most significant word of ppc_fp128";
1298      }
1299      O << '\n';
1300      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1301      if (VerboseAsm) {
1302        O.PadToColumn(MAI->getCommentColumn());
1303        O << MAI->getCommentString()
1304        << " next word";
1305      }
1306      O << '\n';
1307      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1308      if (VerboseAsm) {
1309        O.PadToColumn(MAI->getCommentColumn());
1310        O << MAI->getCommentString()
1311          << " next word";
1312      }
1313      O << '\n';
1314      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
1315      if (VerboseAsm) {
1316        O.PadToColumn(MAI->getCommentColumn());
1317        O << MAI->getCommentString()
1318          << " least significant word";
1319      }
1320      O << '\n';
1321     } else {
1322      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
1323      if (VerboseAsm) {
1324        O.PadToColumn(MAI->getCommentColumn());
1325        O << MAI->getCommentString()
1326          << " least significant word of ppc_fp128";
1327      }
1328      O << '\n';
1329      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1330      if (VerboseAsm) {
1331        O.PadToColumn(MAI->getCommentColumn());
1332        O << MAI->getCommentString()
1333          << " next word";
1334      }
1335      O << '\n';
1336      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1337      if (VerboseAsm) {
1338        O.PadToColumn(MAI->getCommentColumn());
1339        O << MAI->getCommentString()
1340          << " next word";
1341      }
1342      O << '\n';
1343      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1344      if (VerboseAsm) {
1345        O.PadToColumn(MAI->getCommentColumn());
1346        O << MAI->getCommentString()
1347          << " most significant word";
1348      }
1349      O << '\n';
1350    }
1351    return;
1352  } else llvm_unreachable("Floating point constant type not handled");
1353}
1354
1355void AsmPrinter::EmitGlobalConstantLargeInt(const ConstantInt *CI,
1356                                            unsigned AddrSpace) {
1357  const TargetData *TD = TM.getTargetData();
1358  unsigned BitWidth = CI->getBitWidth();
1359  assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
1360
1361  // We don't expect assemblers to support integer data directives
1362  // for more than 64 bits, so we emit the data in at most 64-bit
1363  // quantities at a time.
1364  const uint64_t *RawData = CI->getValue().getRawData();
1365  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1366    uint64_t Val;
1367    if (TD->isBigEndian())
1368      Val = RawData[e - i - 1];
1369    else
1370      Val = RawData[i];
1371
1372    if (MAI->getData64bitsDirective(AddrSpace)) {
1373      O << MAI->getData64bitsDirective(AddrSpace) << Val << '\n';
1374      continue;
1375    }
1376
1377    // Emit two 32-bit chunks, order depends on endianness.
1378    unsigned FirstChunk = unsigned(Val), SecondChunk = unsigned(Val >> 32);
1379    const char *FirstName = " least", *SecondName = " most";
1380    if (TD->isBigEndian()) {
1381      std::swap(FirstChunk, SecondChunk);
1382      std::swap(FirstName, SecondName);
1383    }
1384
1385    O << MAI->getData32bitsDirective(AddrSpace) << FirstChunk;
1386    if (VerboseAsm) {
1387      O.PadToColumn(MAI->getCommentColumn());
1388      O << MAI->getCommentString()
1389        << FirstName << " significant half of i64 " << Val;
1390    }
1391    O << '\n';
1392
1393    O << MAI->getData32bitsDirective(AddrSpace) << SecondChunk;
1394    if (VerboseAsm) {
1395      O.PadToColumn(MAI->getCommentColumn());
1396      O << MAI->getCommentString()
1397        << SecondName << " significant half of i64 " << Val;
1398    }
1399    O << '\n';
1400  }
1401}
1402
1403/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1404void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1405  const TargetData *TD = TM.getTargetData();
1406  const Type *type = CV->getType();
1407  unsigned Size = TD->getTypeAllocSize(type);
1408
1409  if (CV->isNullValue() || isa<UndefValue>(CV)) {
1410    EmitZeros(Size, AddrSpace);
1411    return;
1412  }
1413
1414  if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
1415    EmitGlobalConstantArray(CVA , AddrSpace);
1416    return;
1417  }
1418
1419  if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
1420    EmitGlobalConstantStruct(CVS, AddrSpace);
1421    return;
1422  }
1423
1424  if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
1425    EmitGlobalConstantFP(CFP, AddrSpace);
1426    return;
1427  }
1428
1429  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1430    // If we can directly emit an 8-byte constant, do it.
1431    if (Size == 8)
1432      if (const char *Data64Dir = MAI->getData64bitsDirective(AddrSpace)) {
1433        O << Data64Dir << CI->getZExtValue() << '\n';
1434        return;
1435      }
1436
1437    // Small integers are handled below; large integers are handled here.
1438    if (Size > 4) {
1439      EmitGlobalConstantLargeInt(CI, AddrSpace);
1440      return;
1441    }
1442  }
1443
1444  if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) {
1445    EmitGlobalConstantVector(CP);
1446    return;
1447  }
1448
1449  printDataDirective(type, AddrSpace);
1450  EmitConstantValueOnly(CV);
1451  if (VerboseAsm) {
1452    if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1453      SmallString<40> S;
1454      CI->getValue().toStringUnsigned(S, 16);
1455      O.PadToColumn(MAI->getCommentColumn());
1456      O << MAI->getCommentString() << " 0x" << S.str();
1457    }
1458  }
1459  O << '\n';
1460}
1461
1462void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1463  // Target doesn't support this yet!
1464  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1465}
1466
1467/// PrintSpecial - Print information related to the specified machine instr
1468/// that is independent of the operand, and may be independent of the instr
1469/// itself.  This can be useful for portably encoding the comment character
1470/// or other bits of target-specific knowledge into the asmstrings.  The
1471/// syntax used is ${:comment}.  Targets can override this to add support
1472/// for their own strange codes.
1473void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1474  if (!strcmp(Code, "private")) {
1475    O << MAI->getPrivateGlobalPrefix();
1476  } else if (!strcmp(Code, "comment")) {
1477    if (VerboseAsm)
1478      O << MAI->getCommentString();
1479  } else if (!strcmp(Code, "uid")) {
1480    // Comparing the address of MI isn't sufficient, because machineinstrs may
1481    // be allocated to the same address across functions.
1482    const Function *ThisF = MI->getParent()->getParent()->getFunction();
1483
1484    // If this is a new LastFn instruction, bump the counter.
1485    if (LastMI != MI || LastFn != ThisF) {
1486      ++Counter;
1487      LastMI = MI;
1488      LastFn = ThisF;
1489    }
1490    O << Counter;
1491  } else {
1492    std::string msg;
1493    raw_string_ostream Msg(msg);
1494    Msg << "Unknown special formatter '" << Code
1495         << "' for machine instr: " << *MI;
1496    llvm_report_error(Msg.str());
1497  }
1498}
1499
1500/// processDebugLoc - Processes the debug information of each machine
1501/// instruction's DebugLoc.
1502void AsmPrinter::processDebugLoc(const MachineInstr *MI,
1503                                 bool BeforePrintingInsn) {
1504  if (!MAI || !DW || !MAI->doesSupportDebugInformation()
1505      || !DW->ShouldEmitDwarfDebug())
1506    return;
1507  DebugLoc DL = MI->getDebugLoc();
1508  if (DL.isUnknown())
1509    return;
1510  DILocation CurDLT = MF->getDILocation(DL);
1511  if (CurDLT.getScope().isNull())
1512    return;
1513
1514  if (BeforePrintingInsn) {
1515    if (CurDLT.getNode() != PrevDLT.getNode()) {
1516      unsigned L = DW->RecordSourceLine(CurDLT.getLineNumber(),
1517                                        CurDLT.getColumnNumber(),
1518                                        CurDLT.getScope().getNode());
1519      printLabel(L);
1520      O << '\n';
1521      DW->BeginScope(MI, L);
1522      PrevDLT = CurDLT;
1523    }
1524  } else {
1525    // After printing instruction
1526    DW->EndScope(MI);
1527  }
1528}
1529
1530
1531/// printInlineAsm - This method formats and prints the specified machine
1532/// instruction that is an inline asm.
1533void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1534  unsigned NumOperands = MI->getNumOperands();
1535
1536  // Count the number of register definitions.
1537  unsigned NumDefs = 0;
1538  for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1539       ++NumDefs)
1540    assert(NumDefs != NumOperands-1 && "No asm string?");
1541
1542  assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1543
1544  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1545  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1546
1547  O << '\t';
1548
1549  // If this asmstr is empty, just print the #APP/#NOAPP markers.
1550  // These are useful to see where empty asm's wound up.
1551  if (AsmStr[0] == 0) {
1552    O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1553    O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
1554    return;
1555  }
1556
1557  O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1558
1559  // The variant of the current asmprinter.
1560  int AsmPrinterVariant = MAI->getAssemblerDialect();
1561
1562  int CurVariant = -1;            // The number of the {.|.|.} region we are in.
1563  const char *LastEmitted = AsmStr; // One past the last character emitted.
1564
1565  while (*LastEmitted) {
1566    switch (*LastEmitted) {
1567    default: {
1568      // Not a special case, emit the string section literally.
1569      const char *LiteralEnd = LastEmitted+1;
1570      while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1571             *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1572        ++LiteralEnd;
1573      if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1574        O.write(LastEmitted, LiteralEnd-LastEmitted);
1575      LastEmitted = LiteralEnd;
1576      break;
1577    }
1578    case '\n':
1579      ++LastEmitted;   // Consume newline character.
1580      O << '\n';       // Indent code with newline.
1581      break;
1582    case '$': {
1583      ++LastEmitted;   // Consume '$' character.
1584      bool Done = true;
1585
1586      // Handle escapes.
1587      switch (*LastEmitted) {
1588      default: Done = false; break;
1589      case '$':     // $$ -> $
1590        if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1591          O << '$';
1592        ++LastEmitted;  // Consume second '$' character.
1593        break;
1594      case '(':             // $( -> same as GCC's { character.
1595        ++LastEmitted;      // Consume '(' character.
1596        if (CurVariant != -1) {
1597          llvm_report_error("Nested variants found in inline asm string: '"
1598                            + std::string(AsmStr) + "'");
1599        }
1600        CurVariant = 0;     // We're in the first variant now.
1601        break;
1602      case '|':
1603        ++LastEmitted;  // consume '|' character.
1604        if (CurVariant == -1)
1605          O << '|';       // this is gcc's behavior for | outside a variant
1606        else
1607          ++CurVariant;   // We're in the next variant.
1608        break;
1609      case ')':         // $) -> same as GCC's } char.
1610        ++LastEmitted;  // consume ')' character.
1611        if (CurVariant == -1)
1612          O << '}';     // this is gcc's behavior for } outside a variant
1613        else
1614          CurVariant = -1;
1615        break;
1616      }
1617      if (Done) break;
1618
1619      bool HasCurlyBraces = false;
1620      if (*LastEmitted == '{') {     // ${variable}
1621        ++LastEmitted;               // Consume '{' character.
1622        HasCurlyBraces = true;
1623      }
1624
1625      // If we have ${:foo}, then this is not a real operand reference, it is a
1626      // "magic" string reference, just like in .td files.  Arrange to call
1627      // PrintSpecial.
1628      if (HasCurlyBraces && *LastEmitted == ':') {
1629        ++LastEmitted;
1630        const char *StrStart = LastEmitted;
1631        const char *StrEnd = strchr(StrStart, '}');
1632        if (StrEnd == 0) {
1633          llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1634                            + std::string(AsmStr) + "'");
1635        }
1636
1637        std::string Val(StrStart, StrEnd);
1638        PrintSpecial(MI, Val.c_str());
1639        LastEmitted = StrEnd+1;
1640        break;
1641      }
1642
1643      const char *IDStart = LastEmitted;
1644      char *IDEnd;
1645      errno = 0;
1646      long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1647      if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1648        llvm_report_error("Bad $ operand number in inline asm string: '"
1649                          + std::string(AsmStr) + "'");
1650      }
1651      LastEmitted = IDEnd;
1652
1653      char Modifier[2] = { 0, 0 };
1654
1655      if (HasCurlyBraces) {
1656        // If we have curly braces, check for a modifier character.  This
1657        // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1658        if (*LastEmitted == ':') {
1659          ++LastEmitted;    // Consume ':' character.
1660          if (*LastEmitted == 0) {
1661            llvm_report_error("Bad ${:} expression in inline asm string: '"
1662                              + std::string(AsmStr) + "'");
1663          }
1664
1665          Modifier[0] = *LastEmitted;
1666          ++LastEmitted;    // Consume modifier character.
1667        }
1668
1669        if (*LastEmitted != '}') {
1670          llvm_report_error("Bad ${} expression in inline asm string: '"
1671                            + std::string(AsmStr) + "'");
1672        }
1673        ++LastEmitted;    // Consume '}' character.
1674      }
1675
1676      if ((unsigned)Val >= NumOperands-1) {
1677        llvm_report_error("Invalid $ operand number in inline asm string: '"
1678                          + std::string(AsmStr) + "'");
1679      }
1680
1681      // Okay, we finally have a value number.  Ask the target to print this
1682      // operand!
1683      if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1684        unsigned OpNo = 1;
1685
1686        bool Error = false;
1687
1688        // Scan to find the machine operand number for the operand.
1689        for (; Val; --Val) {
1690          if (OpNo >= MI->getNumOperands()) break;
1691          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1692          OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1693        }
1694
1695        if (OpNo >= MI->getNumOperands()) {
1696          Error = true;
1697        } else {
1698          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1699          ++OpNo;  // Skip over the ID number.
1700
1701          if (Modifier[0] == 'l')  // labels are target independent
1702            O << *GetMBBSymbol(MI->getOperand(OpNo).getMBB()->getNumber());
1703          else {
1704            AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1705            if ((OpFlags & 7) == 4) {
1706              Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1707                                                Modifier[0] ? Modifier : 0);
1708            } else {
1709              Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1710                                          Modifier[0] ? Modifier : 0);
1711            }
1712          }
1713        }
1714        if (Error) {
1715          std::string msg;
1716          raw_string_ostream Msg(msg);
1717          Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n";
1718          MI->print(Msg);
1719          llvm_report_error(Msg.str());
1720        }
1721      }
1722      break;
1723    }
1724    }
1725  }
1726  O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd();
1727}
1728
1729/// printImplicitDef - This method prints the specified machine instruction
1730/// that is an implicit def.
1731void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1732  if (!VerboseAsm) return;
1733  O.PadToColumn(MAI->getCommentColumn());
1734  O << MAI->getCommentString() << " implicit-def: "
1735    << TRI->getName(MI->getOperand(0).getReg());
1736}
1737
1738void AsmPrinter::printKill(const MachineInstr *MI) const {
1739  if (!VerboseAsm) return;
1740  O.PadToColumn(MAI->getCommentColumn());
1741  O << MAI->getCommentString() << " kill:";
1742  for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) {
1743    const MachineOperand &op = MI->getOperand(n);
1744    assert(op.isReg() && "KILL instruction must have only register operands");
1745    O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>");
1746  }
1747}
1748
1749/// printLabel - This method prints a local label used by debug and
1750/// exception handling tables.
1751void AsmPrinter::printLabel(const MachineInstr *MI) const {
1752  printLabel(MI->getOperand(0).getImm());
1753}
1754
1755void AsmPrinter::printLabel(unsigned Id) const {
1756  O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':';
1757}
1758
1759/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1760/// instruction, using the specified assembler variant.  Targets should
1761/// override this to format as appropriate.
1762bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1763                                 unsigned AsmVariant, const char *ExtraCode) {
1764  // Target doesn't support this yet!
1765  return true;
1766}
1767
1768bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1769                                       unsigned AsmVariant,
1770                                       const char *ExtraCode) {
1771  // Target doesn't support this yet!
1772  return true;
1773}
1774
1775MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA,
1776                                            const char *Suffix) const {
1777  return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock(), Suffix);
1778}
1779
1780MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F,
1781                                            const BasicBlock *BB,
1782                                            const char *Suffix) const {
1783  assert(BB->hasName() &&
1784         "Address of anonymous basic block not supported yet!");
1785
1786  // This code must use the function name itself, and not the function number,
1787  // since it must be possible to generate the label name from within other
1788  // functions.
1789  SmallString<60> FnName;
1790  Mang->getNameWithPrefix(FnName, F, false);
1791
1792  // FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME!
1793  SmallString<60> NameResult;
1794  Mang->getNameWithPrefix(NameResult,
1795                          StringRef("BA") + Twine((unsigned)FnName.size()) +
1796                          "_" + FnName.str() + "_" + BB->getName() + Suffix,
1797                          Mangler::Private);
1798
1799  return OutContext.GetOrCreateSymbol(NameResult.str());
1800}
1801
1802MCSymbol *AsmPrinter::GetMBBSymbol(unsigned MBBID) const {
1803  SmallString<60> Name;
1804  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "BB"
1805    << getFunctionNumber() << '_' << MBBID;
1806
1807  return OutContext.GetOrCreateSymbol(Name.str());
1808}
1809
1810/// GetGlobalValueSymbol - Return the MCSymbol for the specified global
1811/// value.
1812MCSymbol *AsmPrinter::GetGlobalValueSymbol(const GlobalValue *GV) const {
1813  SmallString<60> NameStr;
1814  Mang->getNameWithPrefix(NameStr, GV, false);
1815  return OutContext.GetOrCreateSymbol(NameStr.str());
1816}
1817
1818/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
1819/// global value name as its base, with the specified suffix, and where the
1820/// symbol is forced to have private linkage if ForcePrivate is true.
1821MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
1822                                                   StringRef Suffix,
1823                                                   bool ForcePrivate) const {
1824  SmallString<60> NameStr;
1825  Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
1826  NameStr.append(Suffix.begin(), Suffix.end());
1827  return OutContext.GetOrCreateSymbol(NameStr.str());
1828}
1829
1830/// GetExternalSymbolSymbol - Return the MCSymbol for the specified
1831/// ExternalSymbol.
1832MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
1833  SmallString<60> NameStr;
1834  Mang->getNameWithPrefix(NameStr, Sym);
1835  return OutContext.GetOrCreateSymbol(NameStr.str());
1836}
1837
1838
1839/// EmitBasicBlockStart - This method prints the label for the specified
1840/// MachineBasicBlock, an alignment (if present) and a comment describing
1841/// it if appropriate.
1842void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
1843  // Emit an alignment directive for this block, if needed.
1844  if (unsigned Align = MBB->getAlignment())
1845    EmitAlignment(Log2_32(Align));
1846
1847  // If the block has its address taken, emit a special label to satisfy
1848  // references to the block. This is done so that we don't need to
1849  // remember the number of this label, and so that we can make
1850  // forward references to labels without knowing what their numbers
1851  // will be.
1852  if (MBB->hasAddressTaken()) {
1853    O << *GetBlockAddressSymbol(MBB->getBasicBlock()->getParent(),
1854                                MBB->getBasicBlock());
1855    O << ':';
1856    if (VerboseAsm) {
1857      O.PadToColumn(MAI->getCommentColumn());
1858      O << MAI->getCommentString() << " Address Taken";
1859    }
1860    O << '\n';
1861  }
1862
1863  // Print the main label for the block.
1864  if (MBB->pred_empty() || MBB->isOnlyReachableByFallthrough()) {
1865    if (VerboseAsm)
1866      O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':';
1867  } else {
1868    O << *GetMBBSymbol(MBB->getNumber()) << ':';
1869    if (!VerboseAsm)
1870      O << '\n';
1871  }
1872
1873  // Print some comments to accompany the label.
1874  if (VerboseAsm) {
1875    if (const BasicBlock *BB = MBB->getBasicBlock())
1876      if (BB->hasName()) {
1877        O.PadToColumn(MAI->getCommentColumn());
1878        O << MAI->getCommentString() << ' ';
1879        WriteAsOperand(O, BB, /*PrintType=*/false);
1880      }
1881
1882    EmitComments(*MBB);
1883    O << '\n';
1884  }
1885}
1886
1887/// printPICJumpTableSetLabel - This method prints a set label for the
1888/// specified MachineBasicBlock for a jumptable entry.
1889void AsmPrinter::printPICJumpTableSetLabel(unsigned uid,
1890                                           const MachineBasicBlock *MBB) const {
1891  if (!MAI->getSetDirective())
1892    return;
1893
1894  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1895    << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ','
1896    << *GetMBBSymbol(MBB->getNumber())
1897    << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1898    << '_' << uid << '\n';
1899}
1900
1901void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
1902                                           const MachineBasicBlock *MBB) const {
1903  if (!MAI->getSetDirective())
1904    return;
1905
1906  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1907    << getFunctionNumber() << '_' << uid << '_' << uid2
1908    << "_set_" << MBB->getNumber() << ','
1909    << *GetMBBSymbol(MBB->getNumber())
1910    << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1911    << '_' << uid << '_' << uid2 << '\n';
1912}
1913
1914/// printDataDirective - This method prints the asm directive for the
1915/// specified type.
1916void AsmPrinter::printDataDirective(const Type *type, unsigned AddrSpace) {
1917  const TargetData *TD = TM.getTargetData();
1918  switch (type->getTypeID()) {
1919  case Type::FloatTyID: case Type::DoubleTyID:
1920  case Type::X86_FP80TyID: case Type::FP128TyID: case Type::PPC_FP128TyID:
1921    assert(0 && "Should have already output floating point constant.");
1922  default:
1923    assert(0 && "Can't handle printing this type of thing");
1924  case Type::IntegerTyID: {
1925    unsigned BitWidth = cast<IntegerType>(type)->getBitWidth();
1926    if (BitWidth <= 8)
1927      O << MAI->getData8bitsDirective(AddrSpace);
1928    else if (BitWidth <= 16)
1929      O << MAI->getData16bitsDirective(AddrSpace);
1930    else if (BitWidth <= 32)
1931      O << MAI->getData32bitsDirective(AddrSpace);
1932    else if (BitWidth <= 64) {
1933      assert(MAI->getData64bitsDirective(AddrSpace) &&
1934             "Target cannot handle 64-bit constant exprs!");
1935      O << MAI->getData64bitsDirective(AddrSpace);
1936    } else {
1937      llvm_unreachable("Target cannot handle given data directive width!");
1938    }
1939    break;
1940  }
1941  case Type::PointerTyID:
1942    if (TD->getPointerSize() == 8) {
1943      assert(MAI->getData64bitsDirective(AddrSpace) &&
1944             "Target cannot handle 64-bit pointer exprs!");
1945      O << MAI->getData64bitsDirective(AddrSpace);
1946    } else if (TD->getPointerSize() == 2) {
1947      O << MAI->getData16bitsDirective(AddrSpace);
1948    } else if (TD->getPointerSize() == 1) {
1949      O << MAI->getData8bitsDirective(AddrSpace);
1950    } else {
1951      O << MAI->getData32bitsDirective(AddrSpace);
1952    }
1953    break;
1954  }
1955}
1956
1957void AsmPrinter::printVisibility(const MCSymbol *Sym,
1958                                 unsigned Visibility) const {
1959  if (Visibility == GlobalValue::HiddenVisibility) {
1960    if (const char *Directive = MAI->getHiddenDirective())
1961      O << Directive << *Sym << '\n';
1962  } else if (Visibility == GlobalValue::ProtectedVisibility) {
1963    if (const char *Directive = MAI->getProtectedDirective())
1964      O << Directive << *Sym << '\n';
1965  }
1966}
1967
1968void AsmPrinter::printOffset(int64_t Offset) const {
1969  if (Offset > 0)
1970    O << '+' << Offset;
1971  else if (Offset < 0)
1972    O << Offset;
1973}
1974
1975GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1976  if (!S->usesMetadata())
1977    return 0;
1978
1979  gcp_iterator GCPI = GCMetadataPrinters.find(S);
1980  if (GCPI != GCMetadataPrinters.end())
1981    return GCPI->second;
1982
1983  const char *Name = S->getName().c_str();
1984
1985  for (GCMetadataPrinterRegistry::iterator
1986         I = GCMetadataPrinterRegistry::begin(),
1987         E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1988    if (strcmp(Name, I->getName()) == 0) {
1989      GCMetadataPrinter *GMP = I->instantiate();
1990      GMP->S = S;
1991      GCMetadataPrinters.insert(std::make_pair(S, GMP));
1992      return GMP;
1993    }
1994
1995  errs() << "no GCMetadataPrinter registered for GC: " << Name << "\n";
1996  llvm_unreachable(0);
1997}
1998
1999/// EmitComments - Pretty-print comments for instructions
2000void AsmPrinter::EmitComments(const MachineInstr &MI) const {
2001  if (!VerboseAsm)
2002    return;
2003
2004  bool Newline = false;
2005
2006  if (!MI.getDebugLoc().isUnknown()) {
2007    DILocation DLT = MF->getDILocation(MI.getDebugLoc());
2008
2009    // Print source line info.
2010    O.PadToColumn(MAI->getCommentColumn());
2011    O << MAI->getCommentString() << ' ';
2012    DIScope Scope = DLT.getScope();
2013    // Omit the directory, because it's likely to be long and uninteresting.
2014    if (!Scope.isNull())
2015      O << Scope.getFilename();
2016    else
2017      O << "<unknown>";
2018    O << ':' << DLT.getLineNumber();
2019    if (DLT.getColumnNumber() != 0)
2020      O << ':' << DLT.getColumnNumber();
2021    Newline = true;
2022  }
2023
2024  // Check for spills and reloads
2025  int FI;
2026
2027  const MachineFrameInfo *FrameInfo =
2028    MI.getParent()->getParent()->getFrameInfo();
2029
2030  // We assume a single instruction only has a spill or reload, not
2031  // both.
2032  const MachineMemOperand *MMO;
2033  if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
2034    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
2035      MMO = *MI.memoperands_begin();
2036      if (Newline) O << '\n';
2037      O.PadToColumn(MAI->getCommentColumn());
2038      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Reload";
2039      Newline = true;
2040    }
2041  }
2042  else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
2043    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
2044      if (Newline) O << '\n';
2045      O.PadToColumn(MAI->getCommentColumn());
2046      O << MAI->getCommentString() << ' '
2047        << MMO->getSize() << "-byte Folded Reload";
2048      Newline = true;
2049    }
2050  }
2051  else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
2052    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
2053      MMO = *MI.memoperands_begin();
2054      if (Newline) O << '\n';
2055      O.PadToColumn(MAI->getCommentColumn());
2056      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Spill";
2057      Newline = true;
2058    }
2059  }
2060  else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
2061    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
2062      if (Newline) O << '\n';
2063      O.PadToColumn(MAI->getCommentColumn());
2064      O << MAI->getCommentString() << ' '
2065        << MMO->getSize() << "-byte Folded Spill";
2066      Newline = true;
2067    }
2068  }
2069
2070  // Check for spill-induced copies
2071  unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
2072  if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg,
2073                                      SrcSubIdx, DstSubIdx)) {
2074    if (MI.getAsmPrinterFlag(ReloadReuse)) {
2075      if (Newline) O << '\n';
2076      O.PadToColumn(MAI->getCommentColumn());
2077      O << MAI->getCommentString() << " Reload Reuse";
2078    }
2079  }
2080}
2081
2082/// PrintChildLoopComment - Print comments about child loops within
2083/// the loop for this basic block, with nesting.
2084///
2085static void PrintChildLoopComment(formatted_raw_ostream &O,
2086                                  const MachineLoop *loop,
2087                                  const MCAsmInfo *MAI,
2088                                  int FunctionNumber) {
2089  // Add child loop information
2090  for(MachineLoop::iterator cl = loop->begin(),
2091        clend = loop->end();
2092      cl != clend;
2093      ++cl) {
2094    MachineBasicBlock *Header = (*cl)->getHeader();
2095    assert(Header && "No header for loop");
2096
2097    O << '\n';
2098    O.PadToColumn(MAI->getCommentColumn());
2099
2100    O << MAI->getCommentString();
2101    O.indent(((*cl)->getLoopDepth()-1)*2)
2102      << " Child Loop BB" << FunctionNumber << "_"
2103      << Header->getNumber() << " Depth " << (*cl)->getLoopDepth();
2104
2105    PrintChildLoopComment(O, *cl, MAI, FunctionNumber);
2106  }
2107}
2108
2109/// EmitComments - Pretty-print comments for basic blocks
2110void AsmPrinter::EmitComments(const MachineBasicBlock &MBB) const {
2111  if (VerboseAsm) {
2112    // Add loop depth information
2113    const MachineLoop *loop = LI->getLoopFor(&MBB);
2114
2115    if (loop) {
2116      // Print a newline after bb# annotation.
2117      O << "\n";
2118      O.PadToColumn(MAI->getCommentColumn());
2119      O << MAI->getCommentString() << " Loop Depth " << loop->getLoopDepth()
2120        << '\n';
2121
2122      O.PadToColumn(MAI->getCommentColumn());
2123
2124      MachineBasicBlock *Header = loop->getHeader();
2125      assert(Header && "No header for loop");
2126
2127      if (Header == &MBB) {
2128        O << MAI->getCommentString() << " Loop Header";
2129        PrintChildLoopComment(O, loop, MAI, getFunctionNumber());
2130      }
2131      else {
2132        O << MAI->getCommentString() << " Loop Header is BB"
2133          << getFunctionNumber() << "_" << loop->getHeader()->getNumber();
2134      }
2135
2136      if (loop->empty()) {
2137        O << '\n';
2138        O.PadToColumn(MAI->getCommentColumn());
2139        O << MAI->getCommentString() << " Inner Loop";
2140      }
2141
2142      // Add parent loop information
2143      for (const MachineLoop *CurLoop = loop->getParentLoop();
2144           CurLoop;
2145           CurLoop = CurLoop->getParentLoop()) {
2146        MachineBasicBlock *Header = CurLoop->getHeader();
2147        assert(Header && "No header for loop");
2148
2149        O << '\n';
2150        O.PadToColumn(MAI->getCommentColumn());
2151        O << MAI->getCommentString();
2152        O.indent((CurLoop->getLoopDepth()-1)*2)
2153          << " Inside Loop BB" << getFunctionNumber() << "_"
2154          << Header->getNumber() << " Depth " << CurLoop->getLoopDepth();
2155      }
2156    }
2157  }
2158}
2159