AsmPrinter.cpp revision 814819f6ea7fb0638fe73920299fda0da941a59e 
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 (const char *WeakDef = MAI->getWeakDefDirective()) {
230      // .globl _foo
231      OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
232      // .weak_definition _foo
233      O << WeakDef << *GVSym << '\n';
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      O << "\t.weak\t" << *GVSym << '\n';
241    break;
242  case GlobalValue::DLLExportLinkage:
243  case GlobalValue::AppendingLinkage:
244    // FIXME: appending linkage variables should go into a section of
245    // their name or something.  For now, just emit them as external.
246  case GlobalValue::ExternalLinkage:
247    // If external or appending, declare as a global symbol.
248    // .globl _foo
249    OutStreamer.EmitSymbolAttribute(GVSym, MCStreamer::Global);
250    break;
251  case GlobalValue::PrivateLinkage:
252  case GlobalValue::InternalLinkage:
253     break;
254  default:
255    llvm_unreachable("Unknown linkage type!");
256  }
257
258  EmitAlignment(AlignLog, GV);
259  O << *GVSym << ":";
260  if (VerboseAsm) {
261    O.PadToColumn(MAI->getCommentColumn());
262    O << MAI->getCommentString() << ' ';
263    WriteAsOperand(O, GV, /*PrintType=*/false, GV->getParent());
264  }
265  O << '\n';
266
267  EmitGlobalConstant(GV->getInitializer());
268
269  if (MAI->hasDotTypeDotSizeDirective())
270    O << "\t.size\t" << *GVSym << ", " << Size << '\n';
271}
272
273
274bool AsmPrinter::doFinalization(Module &M) {
275  // Emit global variables.
276  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
277       I != E; ++I)
278    EmitGlobalVariable(I);
279
280  // Emit final debug information.
281  if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
282    DW->EndModule();
283
284  // If the target wants to know about weak references, print them all.
285  if (MAI->getWeakRefDirective()) {
286    // FIXME: This is not lazy, it would be nice to only print weak references
287    // to stuff that is actually used.  Note that doing so would require targets
288    // to notice uses in operands (due to constant exprs etc).  This should
289    // happen with the MC stuff eventually.
290
291    // Print out module-level global variables here.
292    for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
293         I != E; ++I) {
294      if (!I->hasExternalWeakLinkage()) continue;
295      O << MAI->getWeakRefDirective() << *GetGlobalValueSymbol(I) << '\n';
296    }
297
298    for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
299      if (!I->hasExternalWeakLinkage()) continue;
300      O << MAI->getWeakRefDirective() << *GetGlobalValueSymbol(I) << '\n';
301    }
302  }
303
304  if (MAI->getSetDirective()) {
305    O << '\n';
306    for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
307         I != E; ++I) {
308      MCSymbol *Name = GetGlobalValueSymbol(I);
309
310      const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
311      MCSymbol *Target = GetGlobalValueSymbol(GV);
312
313      if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
314        O << "\t.globl\t" << *Name << '\n';
315      else if (I->hasWeakLinkage())
316        O << MAI->getWeakRefDirective() << *Name << '\n';
317      else
318        assert(I->hasLocalLinkage() && "Invalid alias linkage");
319
320      printVisibility(Name, I->getVisibility());
321
322      O << MAI->getSetDirective() << ' ' << *Name << ", " << *Target << '\n';
323    }
324  }
325
326  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
327  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
328  for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
329    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
330      MP->finishAssembly(O, *this, *MAI);
331
332  // If we don't have any trampolines, then we don't require stack memory
333  // to be executable. Some targets have a directive to declare this.
334  Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
335  if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
336    if (MAI->getNonexecutableStackDirective())
337      O << MAI->getNonexecutableStackDirective() << '\n';
338
339
340  // Allow the target to emit any magic that it wants at the end of the file,
341  // after everything else has gone out.
342  EmitEndOfAsmFile(M);
343
344  delete Mang; Mang = 0;
345  DW = 0; MMI = 0;
346
347  OutStreamer.Finish();
348  return false;
349}
350
351void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
352  // Get the function symbol.
353  CurrentFnSym = GetGlobalValueSymbol(MF.getFunction());
354  IncrementFunctionNumber();
355
356  if (VerboseAsm)
357    LI = &getAnalysis<MachineLoopInfo>();
358}
359
360namespace {
361  // SectionCPs - Keep track the alignment, constpool entries per Section.
362  struct SectionCPs {
363    const MCSection *S;
364    unsigned Alignment;
365    SmallVector<unsigned, 4> CPEs;
366    SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
367  };
368}
369
370/// EmitConstantPool - Print to the current output stream assembly
371/// representations of the constants in the constant pool MCP. This is
372/// used to print out constants which have been "spilled to memory" by
373/// the code generator.
374///
375void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
376  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
377  if (CP.empty()) return;
378
379  // Calculate sections for constant pool entries. We collect entries to go into
380  // the same section together to reduce amount of section switch statements.
381  SmallVector<SectionCPs, 4> CPSections;
382  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
383    const MachineConstantPoolEntry &CPE = CP[i];
384    unsigned Align = CPE.getAlignment();
385
386    SectionKind Kind;
387    switch (CPE.getRelocationInfo()) {
388    default: llvm_unreachable("Unknown section kind");
389    case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
390    case 1:
391      Kind = SectionKind::getReadOnlyWithRelLocal();
392      break;
393    case 0:
394    switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
395    case 4:  Kind = SectionKind::getMergeableConst4(); break;
396    case 8:  Kind = SectionKind::getMergeableConst8(); break;
397    case 16: Kind = SectionKind::getMergeableConst16();break;
398    default: Kind = SectionKind::getMergeableConst(); break;
399    }
400    }
401
402    const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
403
404    // The number of sections are small, just do a linear search from the
405    // last section to the first.
406    bool Found = false;
407    unsigned SecIdx = CPSections.size();
408    while (SecIdx != 0) {
409      if (CPSections[--SecIdx].S == S) {
410        Found = true;
411        break;
412      }
413    }
414    if (!Found) {
415      SecIdx = CPSections.size();
416      CPSections.push_back(SectionCPs(S, Align));
417    }
418
419    if (Align > CPSections[SecIdx].Alignment)
420      CPSections[SecIdx].Alignment = Align;
421    CPSections[SecIdx].CPEs.push_back(i);
422  }
423
424  // Now print stuff into the calculated sections.
425  for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
426    OutStreamer.SwitchSection(CPSections[i].S);
427    EmitAlignment(Log2_32(CPSections[i].Alignment));
428
429    unsigned Offset = 0;
430    for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
431      unsigned CPI = CPSections[i].CPEs[j];
432      MachineConstantPoolEntry CPE = CP[CPI];
433
434      // Emit inter-object padding for alignment.
435      unsigned AlignMask = CPE.getAlignment() - 1;
436      unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
437      EmitZeros(NewOffset - Offset);
438
439      const Type *Ty = CPE.getType();
440      Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
441
442      O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
443        << CPI << ':';
444      if (VerboseAsm) {
445        O.PadToColumn(MAI->getCommentColumn());
446        O << MAI->getCommentString() << " constant ";
447        WriteTypeSymbolic(O, CPE.getType(), MF->getFunction()->getParent());
448      }
449      O << '\n';
450      if (CPE.isMachineConstantPoolEntry())
451        EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
452      else
453        EmitGlobalConstant(CPE.Val.ConstVal);
454    }
455  }
456}
457
458/// EmitJumpTableInfo - Print assembly representations of the jump tables used
459/// by the current function to the current output stream.
460///
461void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
462                                   MachineFunction &MF) {
463  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
464  if (JT.empty()) return;
465
466  bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
467
468  // Pick the directive to use to print the jump table entries, and switch to
469  // the appropriate section.
470  TargetLowering *LoweringInfo = TM.getTargetLowering();
471
472  const Function *F = MF.getFunction();
473  bool JTInDiffSection = false;
474  if (F->isWeakForLinker() ||
475      (IsPic && !LoweringInfo->usesGlobalOffsetTable())) {
476    // In PIC mode, we need to emit the jump table to the same section as the
477    // function body itself, otherwise the label differences won't make sense.
478    // We should also do if the section name is NULL or function is declared in
479    // discardable section.
480    OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang,
481                                                                    TM));
482  } else {
483    // Otherwise, drop it in the readonly section.
484    const MCSection *ReadOnlySection =
485      getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
486    OutStreamer.SwitchSection(ReadOnlySection);
487    JTInDiffSection = true;
488  }
489
490  EmitAlignment(Log2_32(MJTI->getAlignment()));
491
492  for (unsigned i = 0, e = JT.size(); i != e; ++i) {
493    const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
494
495    // If this jump table was deleted, ignore it.
496    if (JTBBs.empty()) continue;
497
498    // For PIC codegen, if possible we want to use the SetDirective to reduce
499    // the number of relocations the assembler will generate for the jump table.
500    // Set directives are all printed before the jump table itself.
501    SmallPtrSet<MachineBasicBlock*, 16> EmittedSets;
502    if (MAI->getSetDirective() && IsPic)
503      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
504        if (EmittedSets.insert(JTBBs[ii]))
505          printPICJumpTableSetLabel(i, JTBBs[ii]);
506
507    // On some targets (e.g. Darwin) we want to emit two consequtive labels
508    // before each jump table.  The first label is never referenced, but tells
509    // the assembler and linker the extents of the jump table object.  The
510    // second label is actually referenced by the code.
511    if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0]) {
512      O << MAI->getLinkerPrivateGlobalPrefix()
513        << "JTI" << getFunctionNumber() << '_' << i << ":\n";
514    }
515
516    O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
517      << '_' << i << ":\n";
518
519    for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
520      printPICJumpTableEntry(MJTI, JTBBs[ii], i);
521      O << '\n';
522    }
523  }
524}
525
526void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
527                                        const MachineBasicBlock *MBB,
528                                        unsigned uid)  const {
529  bool isPIC = TM.getRelocationModel() == Reloc::PIC_;
530
531  // Use JumpTableDirective otherwise honor the entry size from the jump table
532  // info.
533  const char *JTEntryDirective = MAI->getJumpTableDirective(isPIC);
534  bool HadJTEntryDirective = JTEntryDirective != NULL;
535  if (!HadJTEntryDirective) {
536    JTEntryDirective = MJTI->getEntrySize() == 4 ?
537      MAI->getData32bitsDirective() : MAI->getData64bitsDirective();
538  }
539
540  O << JTEntryDirective << ' ';
541
542  // If we have emitted set directives for the jump table entries, print
543  // them rather than the entries themselves.  If we're emitting PIC, then
544  // emit the table entries as differences between two text section labels.
545  // If we're emitting non-PIC code, then emit the entries as direct
546  // references to the target basic blocks.
547  if (!isPIC) {
548    O << *GetMBBSymbol(MBB->getNumber());
549  } else if (MAI->getSetDirective()) {
550    O << MAI->getPrivateGlobalPrefix() << getFunctionNumber()
551      << '_' << uid << "_set_" << MBB->getNumber();
552  } else {
553    O << *GetMBBSymbol(MBB->getNumber());
554    // If the arch uses custom Jump Table directives, don't calc relative to
555    // JT
556    if (!HadJTEntryDirective)
557      O << '-' << MAI->getPrivateGlobalPrefix() << "JTI"
558        << getFunctionNumber() << '_' << uid;
559  }
560}
561
562
563/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
564/// special global used by LLVM.  If so, emit it and return true, otherwise
565/// do nothing and return false.
566bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
567  if (GV->getName() == "llvm.used") {
568    if (MAI->getUsedDirective() != 0)    // No need to emit this at all.
569      EmitLLVMUsedList(GV->getInitializer());
570    return true;
571  }
572
573  // Ignore debug and non-emitted data.  This handles llvm.compiler.used.
574  if (GV->getSection() == "llvm.metadata" ||
575      GV->hasAvailableExternallyLinkage())
576    return true;
577
578  if (!GV->hasAppendingLinkage()) return false;
579
580  assert(GV->hasInitializer() && "Not a special LLVM global!");
581
582  const TargetData *TD = TM.getTargetData();
583  unsigned Align = Log2_32(TD->getPointerPrefAlignment());
584  if (GV->getName() == "llvm.global_ctors") {
585    OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
586    EmitAlignment(Align, 0);
587    EmitXXStructorList(GV->getInitializer());
588
589    if (TM.getRelocationModel() == Reloc::Static &&
590        MAI->hasStaticCtorDtorReferenceInStaticMode())
591      O << ".reference .constructors_used\n";
592    return true;
593  }
594
595  if (GV->getName() == "llvm.global_dtors") {
596    OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
597    EmitAlignment(Align, 0);
598    EmitXXStructorList(GV->getInitializer());
599
600    if (TM.getRelocationModel() == Reloc::Static &&
601        MAI->hasStaticCtorDtorReferenceInStaticMode())
602      O << ".reference .destructors_used\n";
603    return true;
604  }
605
606  return false;
607}
608
609/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
610/// global in the specified llvm.used list for which emitUsedDirectiveFor
611/// is true, as being used with this directive.
612void AsmPrinter::EmitLLVMUsedList(Constant *List) {
613  const char *Directive = MAI->getUsedDirective();
614
615  // Should be an array of 'i8*'.
616  ConstantArray *InitList = dyn_cast<ConstantArray>(List);
617  if (InitList == 0) return;
618
619  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
620    const GlobalValue *GV =
621      dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
622    if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang)) {
623      O << Directive;
624      EmitConstantValueOnly(InitList->getOperand(i));
625      O << '\n';
626    }
627  }
628}
629
630/// EmitXXStructorList - Emit the ctor or dtor list.  This just prints out the
631/// function pointers, ignoring the init priority.
632void AsmPrinter::EmitXXStructorList(Constant *List) {
633  // Should be an array of '{ int, void ()* }' structs.  The first value is the
634  // init priority, which we ignore.
635  if (!isa<ConstantArray>(List)) return;
636  ConstantArray *InitList = cast<ConstantArray>(List);
637  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
638    if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
639      if (CS->getNumOperands() != 2) return;  // Not array of 2-element structs.
640
641      if (CS->getOperand(1)->isNullValue())
642        return;  // Found a null terminator, exit printing.
643      // Emit the function pointer.
644      EmitGlobalConstant(CS->getOperand(1));
645    }
646}
647
648
649//===----------------------------------------------------------------------===//
650/// LEB 128 number encoding.
651
652/// PrintULEB128 - Print a series of hexadecimal values (separated by commas)
653/// representing an unsigned leb128 value.
654void AsmPrinter::PrintULEB128(unsigned Value) const {
655  do {
656    unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
657    Value >>= 7;
658    if (Value) Byte |= 0x80;
659    PrintHex(Byte);
660    if (Value) O << ", ";
661  } while (Value);
662}
663
664/// PrintSLEB128 - Print a series of hexadecimal values (separated by commas)
665/// representing a signed leb128 value.
666void AsmPrinter::PrintSLEB128(int Value) const {
667  int Sign = Value >> (8 * sizeof(Value) - 1);
668  bool IsMore;
669
670  do {
671    unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
672    Value >>= 7;
673    IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
674    if (IsMore) Byte |= 0x80;
675    PrintHex(Byte);
676    if (IsMore) O << ", ";
677  } while (IsMore);
678}
679
680//===--------------------------------------------------------------------===//
681// Emission and print routines
682//
683
684/// PrintHex - Print a value as a hexadecimal value.
685///
686void AsmPrinter::PrintHex(uint64_t Value) const {
687  O << "0x";
688  O.write_hex(Value);
689}
690
691/// EOL - Print a newline character to asm stream.  If a comment is present
692/// then it will be printed first.  Comments should not contain '\n'.
693void AsmPrinter::EOL() const {
694  O << '\n';
695}
696
697void AsmPrinter::EOL(const Twine &Comment) const {
698  if (VerboseAsm && !Comment.isTriviallyEmpty()) {
699    O.PadToColumn(MAI->getCommentColumn());
700    O << MAI->getCommentString()
701      << ' '
702      << Comment;
703  }
704  O << '\n';
705}
706
707static const char *DecodeDWARFEncoding(unsigned Encoding) {
708  switch (Encoding) {
709  case dwarf::DW_EH_PE_absptr:
710    return "absptr";
711  case dwarf::DW_EH_PE_omit:
712    return "omit";
713  case dwarf::DW_EH_PE_pcrel:
714    return "pcrel";
715  case dwarf::DW_EH_PE_udata4:
716    return "udata4";
717  case dwarf::DW_EH_PE_udata8:
718    return "udata8";
719  case dwarf::DW_EH_PE_sdata4:
720    return "sdata4";
721  case dwarf::DW_EH_PE_sdata8:
722    return "sdata8";
723  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4:
724    return "pcrel udata4";
725  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4:
726    return "pcrel sdata4";
727  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8:
728    return "pcrel udata8";
729  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8:
730    return "pcrel sdata8";
731  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata4:
732    return "indirect pcrel udata4";
733  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata4:
734    return "indirect pcrel sdata4";
735  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata8:
736    return "indirect pcrel udata8";
737  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata8:
738    return "indirect pcrel sdata8";
739  }
740
741  return 0;
742}
743
744void AsmPrinter::EOL(const Twine &Comment, unsigned Encoding) const {
745  if (VerboseAsm && !Comment.isTriviallyEmpty()) {
746    O.PadToColumn(MAI->getCommentColumn());
747    O << MAI->getCommentString()
748      << ' '
749      << Comment;
750
751    if (const char *EncStr = DecodeDWARFEncoding(Encoding))
752      O << " (" << EncStr << ')';
753  }
754  O << '\n';
755}
756
757/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
758/// unsigned leb128 value.
759void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
760  if (MAI->hasLEB128()) {
761    O << "\t.uleb128\t"
762      << Value;
763  } else {
764    O << MAI->getData8bitsDirective();
765    PrintULEB128(Value);
766  }
767}
768
769/// EmitSLEB128Bytes - print an assembler byte data directive to compose a
770/// signed leb128 value.
771void AsmPrinter::EmitSLEB128Bytes(int Value) const {
772  if (MAI->hasLEB128()) {
773    O << "\t.sleb128\t"
774      << Value;
775  } else {
776    O << MAI->getData8bitsDirective();
777    PrintSLEB128(Value);
778  }
779}
780
781/// EmitInt8 - Emit a byte directive and value.
782///
783void AsmPrinter::EmitInt8(int Value) const {
784  O << MAI->getData8bitsDirective();
785  PrintHex(Value & 0xFF);
786}
787
788/// EmitInt16 - Emit a short directive and value.
789///
790void AsmPrinter::EmitInt16(int Value) const {
791  O << MAI->getData16bitsDirective();
792  PrintHex(Value & 0xFFFF);
793}
794
795/// EmitInt32 - Emit a long directive and value.
796///
797void AsmPrinter::EmitInt32(int Value) const {
798  O << MAI->getData32bitsDirective();
799  PrintHex(Value);
800}
801
802/// EmitInt64 - Emit a long long directive and value.
803///
804void AsmPrinter::EmitInt64(uint64_t Value) const {
805  if (MAI->getData64bitsDirective()) {
806    O << MAI->getData64bitsDirective();
807    PrintHex(Value);
808  } else {
809    if (TM.getTargetData()->isBigEndian()) {
810      EmitInt32(unsigned(Value >> 32)); O << '\n';
811      EmitInt32(unsigned(Value));
812    } else {
813      EmitInt32(unsigned(Value)); O << '\n';
814      EmitInt32(unsigned(Value >> 32));
815    }
816  }
817}
818
819/// toOctal - Convert the low order bits of X into an octal digit.
820///
821static inline char toOctal(int X) {
822  return (X&7)+'0';
823}
824
825/// printStringChar - Print a char, escaped if necessary.
826///
827static void printStringChar(formatted_raw_ostream &O, unsigned char C) {
828  if (C == '"') {
829    O << "\\\"";
830  } else if (C == '\\') {
831    O << "\\\\";
832  } else if (isprint((unsigned char)C)) {
833    O << C;
834  } else {
835    switch(C) {
836    case '\b': O << "\\b"; break;
837    case '\f': O << "\\f"; break;
838    case '\n': O << "\\n"; break;
839    case '\r': O << "\\r"; break;
840    case '\t': O << "\\t"; break;
841    default:
842      O << '\\';
843      O << toOctal(C >> 6);
844      O << toOctal(C >> 3);
845      O << toOctal(C >> 0);
846      break;
847    }
848  }
849}
850
851/// EmitString - Emit a string with quotes and a null terminator.
852/// Special characters are emitted properly.
853/// \literal (Eg. '\t') \endliteral
854void AsmPrinter::EmitString(const StringRef String) const {
855  EmitString(String.data(), String.size());
856}
857
858void AsmPrinter::EmitString(const char *String, unsigned Size) const {
859  const char* AscizDirective = MAI->getAscizDirective();
860  if (AscizDirective)
861    O << AscizDirective;
862  else
863    O << MAI->getAsciiDirective();
864  O << '\"';
865  for (unsigned i = 0; i < Size; ++i)
866    printStringChar(O, String[i]);
867  if (AscizDirective)
868    O << '\"';
869  else
870    O << "\\0\"";
871}
872
873
874/// EmitFile - Emit a .file directive.
875void AsmPrinter::EmitFile(unsigned Number, StringRef Name) const {
876  O << "\t.file\t" << Number << " \"";
877  for (unsigned i = 0, N = Name.size(); i < N; ++i)
878    printStringChar(O, Name[i]);
879  O << '\"';
880}
881
882
883//===----------------------------------------------------------------------===//
884
885// EmitAlignment - Emit an alignment directive to the specified power of
886// two boundary.  For example, if you pass in 3 here, you will get an 8
887// byte alignment.  If a global value is specified, and if that global has
888// an explicit alignment requested, it will unconditionally override the
889// alignment request.  However, if ForcedAlignBits is specified, this value
890// has final say: the ultimate alignment will be the max of ForcedAlignBits
891// and the alignment computed with NumBits and the global.
892//
893// The algorithm is:
894//     Align = NumBits;
895//     if (GV && GV->hasalignment) Align = GV->getalignment();
896//     Align = std::max(Align, ForcedAlignBits);
897//
898void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
899                               unsigned ForcedAlignBits,
900                               bool UseFillExpr) const {
901  if (GV && GV->getAlignment())
902    NumBits = Log2_32(GV->getAlignment());
903  NumBits = std::max(NumBits, ForcedAlignBits);
904
905  if (NumBits == 0) return;   // No need to emit alignment.
906
907  unsigned FillValue = 0;
908  if (getCurrentSection()->getKind().isText())
909    FillValue = MAI->getTextAlignFillValue();
910
911  OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0);
912}
913
914/// EmitZeros - Emit a block of zeros.
915///
916void AsmPrinter::EmitZeros(uint64_t NumZeros, unsigned AddrSpace) const {
917  if (NumZeros) {
918    if (MAI->getZeroDirective()) {
919      O << MAI->getZeroDirective() << NumZeros;
920      if (MAI->getZeroDirectiveSuffix())
921        O << MAI->getZeroDirectiveSuffix();
922      O << '\n';
923    } else {
924      for (; NumZeros; --NumZeros)
925        O << MAI->getData8bitsDirective(AddrSpace) << "0\n";
926    }
927  }
928}
929
930// Print out the specified constant, without a storage class.  Only the
931// constants valid in constant expressions can occur here.
932void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
933  if (CV->isNullValue() || isa<UndefValue>(CV)) {
934    O << '0';
935    return;
936  }
937
938  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
939    O << CI->getZExtValue();
940    return;
941  }
942
943  if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
944    // This is a constant address for a global variable or function. Use the
945    // name of the variable or function as the address value.
946    O << *GetGlobalValueSymbol(GV);
947    return;
948  }
949
950  if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV)) {
951    O << *GetBlockAddressSymbol(BA);
952    return;
953  }
954
955  const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
956  if (CE == 0) {
957    llvm_unreachable("Unknown constant value!");
958    O << '0';
959    return;
960  }
961
962  switch (CE->getOpcode()) {
963  case Instruction::ZExt:
964  case Instruction::SExt:
965  case Instruction::FPTrunc:
966  case Instruction::FPExt:
967  case Instruction::UIToFP:
968  case Instruction::SIToFP:
969  case Instruction::FPToUI:
970  case Instruction::FPToSI:
971  default:
972    llvm_unreachable("FIXME: Don't support this constant cast expr");
973  case Instruction::GetElementPtr: {
974    // generate a symbolic expression for the byte address
975    const TargetData *TD = TM.getTargetData();
976    const Constant *ptrVal = CE->getOperand(0);
977    SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
978    int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
979                                          idxVec.size());
980    if (Offset == 0)
981      return EmitConstantValueOnly(ptrVal);
982
983    // Truncate/sext the offset to the pointer size.
984    if (TD->getPointerSizeInBits() != 64) {
985      int SExtAmount = 64-TD->getPointerSizeInBits();
986      Offset = (Offset << SExtAmount) >> SExtAmount;
987    }
988
989    if (Offset)
990      O << '(';
991    EmitConstantValueOnly(ptrVal);
992    if (Offset > 0)
993      O << ") + " << Offset;
994    else
995      O << ") - " << -Offset;
996    return;
997  }
998  case Instruction::BitCast:
999    return EmitConstantValueOnly(CE->getOperand(0));
1000
1001  case Instruction::IntToPtr: {
1002    // Handle casts to pointers by changing them into casts to the appropriate
1003    // integer type.  This promotes constant folding and simplifies this code.
1004    const TargetData *TD = TM.getTargetData();
1005    Constant *Op = CE->getOperand(0);
1006    Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(CV->getContext()),
1007                                      false/*ZExt*/);
1008    return EmitConstantValueOnly(Op);
1009  }
1010
1011  case Instruction::PtrToInt: {
1012    // Support only foldable casts to/from pointers that can be eliminated by
1013    // changing the pointer to the appropriately sized integer type.
1014    Constant *Op = CE->getOperand(0);
1015    const Type *Ty = CE->getType();
1016    const TargetData *TD = TM.getTargetData();
1017
1018    // We can emit the pointer value into this slot if the slot is an
1019    // integer slot greater or equal to the size of the pointer.
1020    if (TD->getTypeAllocSize(Ty) == TD->getTypeAllocSize(Op->getType()))
1021      return EmitConstantValueOnly(Op);
1022
1023    O << "((";
1024    EmitConstantValueOnly(Op);
1025    APInt ptrMask =
1026      APInt::getAllOnesValue(TD->getTypeAllocSizeInBits(Op->getType()));
1027
1028    SmallString<40> S;
1029    ptrMask.toStringUnsigned(S);
1030    O << ") & " << S.str() << ')';
1031    return;
1032  }
1033
1034  case Instruction::Trunc:
1035    // We emit the value and depend on the assembler to truncate the generated
1036    // expression properly.  This is important for differences between
1037    // blockaddress labels.  Since the two labels are in the same function, it
1038    // is reasonable to treat their delta as a 32-bit value.
1039    return EmitConstantValueOnly(CE->getOperand(0));
1040
1041  case Instruction::Add:
1042  case Instruction::Sub:
1043  case Instruction::And:
1044  case Instruction::Or:
1045  case Instruction::Xor:
1046    O << '(';
1047    EmitConstantValueOnly(CE->getOperand(0));
1048    O << ')';
1049    switch (CE->getOpcode()) {
1050    case Instruction::Add:
1051     O << " + ";
1052     break;
1053    case Instruction::Sub:
1054     O << " - ";
1055     break;
1056    case Instruction::And:
1057     O << " & ";
1058     break;
1059    case Instruction::Or:
1060     O << " | ";
1061     break;
1062    case Instruction::Xor:
1063     O << " ^ ";
1064     break;
1065    default:
1066     break;
1067    }
1068    O << '(';
1069    EmitConstantValueOnly(CE->getOperand(1));
1070    O << ')';
1071    break;
1072  }
1073}
1074
1075/// printAsCString - Print the specified array as a C compatible string, only if
1076/// the predicate isString is true.
1077///
1078static void printAsCString(formatted_raw_ostream &O, const ConstantArray *CVA,
1079                           unsigned LastElt) {
1080  assert(CVA->isString() && "Array is not string compatible!");
1081
1082  O << '\"';
1083  for (unsigned i = 0; i != LastElt; ++i) {
1084    unsigned char C =
1085        (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
1086    printStringChar(O, C);
1087  }
1088  O << '\"';
1089}
1090
1091/// EmitString - Emit a zero-byte-terminated string constant.
1092///
1093void AsmPrinter::EmitString(const ConstantArray *CVA) const {
1094  unsigned NumElts = CVA->getNumOperands();
1095  if (MAI->getAscizDirective() && NumElts &&
1096      cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
1097    O << MAI->getAscizDirective();
1098    printAsCString(O, CVA, NumElts-1);
1099  } else {
1100    O << MAI->getAsciiDirective();
1101    printAsCString(O, CVA, NumElts);
1102  }
1103  O << '\n';
1104}
1105
1106void AsmPrinter::EmitGlobalConstantArray(const ConstantArray *CVA,
1107                                         unsigned AddrSpace) {
1108  if (CVA->isString()) {
1109    EmitString(CVA);
1110  } else { // Not a string.  Print the values in successive locations
1111    for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
1112      EmitGlobalConstant(CVA->getOperand(i), AddrSpace);
1113  }
1114}
1115
1116void AsmPrinter::EmitGlobalConstantVector(const ConstantVector *CP) {
1117  const VectorType *PTy = CP->getType();
1118
1119  for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
1120    EmitGlobalConstant(CP->getOperand(I));
1121}
1122
1123void AsmPrinter::EmitGlobalConstantStruct(const ConstantStruct *CVS,
1124                                          unsigned AddrSpace) {
1125  // Print the fields in successive locations. Pad to align if needed!
1126  const TargetData *TD = TM.getTargetData();
1127  unsigned Size = TD->getTypeAllocSize(CVS->getType());
1128  const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
1129  uint64_t sizeSoFar = 0;
1130  for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
1131    const Constant* field = CVS->getOperand(i);
1132
1133    // Check if padding is needed and insert one or more 0s.
1134    uint64_t fieldSize = TD->getTypeAllocSize(field->getType());
1135    uint64_t padSize = ((i == e-1 ? Size : cvsLayout->getElementOffset(i+1))
1136                        - cvsLayout->getElementOffset(i)) - fieldSize;
1137    sizeSoFar += fieldSize + padSize;
1138
1139    // Now print the actual field value.
1140    EmitGlobalConstant(field, AddrSpace);
1141
1142    // Insert padding - this may include padding to increase the size of the
1143    // current field up to the ABI size (if the struct is not packed) as well
1144    // as padding to ensure that the next field starts at the right offset.
1145    EmitZeros(padSize, AddrSpace);
1146  }
1147  assert(sizeSoFar == cvsLayout->getSizeInBytes() &&
1148         "Layout of constant struct may be incorrect!");
1149}
1150
1151void AsmPrinter::EmitGlobalConstantFP(const ConstantFP *CFP,
1152                                      unsigned AddrSpace) {
1153  // FP Constants are printed as integer constants to avoid losing
1154  // precision...
1155  LLVMContext &Context = CFP->getContext();
1156  const TargetData *TD = TM.getTargetData();
1157  if (CFP->getType()->isDoubleTy()) {
1158    double Val = CFP->getValueAPF().convertToDouble();  // for comment only
1159    uint64_t i = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1160    if (MAI->getData64bitsDirective(AddrSpace)) {
1161      O << MAI->getData64bitsDirective(AddrSpace) << i;
1162      if (VerboseAsm) {
1163        O.PadToColumn(MAI->getCommentColumn());
1164        O << MAI->getCommentString() << " double " << Val;
1165      }
1166      O << '\n';
1167    } else if (TD->isBigEndian()) {
1168      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1169      if (VerboseAsm) {
1170        O.PadToColumn(MAI->getCommentColumn());
1171        O << MAI->getCommentString()
1172          << " most significant word of double " << Val;
1173      }
1174      O << '\n';
1175      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1176      if (VerboseAsm) {
1177        O.PadToColumn(MAI->getCommentColumn());
1178        O << MAI->getCommentString()
1179          << " least significant word of double " << Val;
1180      }
1181      O << '\n';
1182    } else {
1183      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1184      if (VerboseAsm) {
1185        O.PadToColumn(MAI->getCommentColumn());
1186        O << MAI->getCommentString()
1187          << " least significant word of double " << Val;
1188      }
1189      O << '\n';
1190      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1191      if (VerboseAsm) {
1192        O.PadToColumn(MAI->getCommentColumn());
1193        O << MAI->getCommentString()
1194          << " most significant word of double " << Val;
1195      }
1196      O << '\n';
1197    }
1198    return;
1199  }
1200
1201  if (CFP->getType()->isFloatTy()) {
1202    float Val = CFP->getValueAPF().convertToFloat();  // for comment only
1203    O << MAI->getData32bitsDirective(AddrSpace)
1204      << CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1205    if (VerboseAsm) {
1206      O.PadToColumn(MAI->getCommentColumn());
1207      O << MAI->getCommentString() << " float " << Val;
1208    }
1209    O << '\n';
1210    return;
1211  }
1212
1213  if (CFP->getType()->isX86_FP80Ty()) {
1214    // all long double variants are printed as hex
1215    // api needed to prevent premature destruction
1216    APInt api = CFP->getValueAPF().bitcastToAPInt();
1217    const uint64_t *p = api.getRawData();
1218    // Convert to double so we can print the approximate val as a comment.
1219    APFloat DoubleVal = CFP->getValueAPF();
1220    bool ignored;
1221    DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1222                      &ignored);
1223    if (TD->isBigEndian()) {
1224      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1225      if (VerboseAsm) {
1226        O.PadToColumn(MAI->getCommentColumn());
1227        O << MAI->getCommentString()
1228          << " most significant halfword of x86_fp80 ~"
1229          << DoubleVal.convertToDouble();
1230      }
1231      O << '\n';
1232      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1233      if (VerboseAsm) {
1234        O.PadToColumn(MAI->getCommentColumn());
1235        O << MAI->getCommentString() << " next halfword";
1236      }
1237      O << '\n';
1238      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1239      if (VerboseAsm) {
1240        O.PadToColumn(MAI->getCommentColumn());
1241        O << MAI->getCommentString() << " next halfword";
1242      }
1243      O << '\n';
1244      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1245      if (VerboseAsm) {
1246        O.PadToColumn(MAI->getCommentColumn());
1247        O << MAI->getCommentString() << " next halfword";
1248      }
1249      O << '\n';
1250      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1251      if (VerboseAsm) {
1252        O.PadToColumn(MAI->getCommentColumn());
1253        O << MAI->getCommentString()
1254          << " least significant halfword";
1255      }
1256      O << '\n';
1257     } else {
1258      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1259      if (VerboseAsm) {
1260        O.PadToColumn(MAI->getCommentColumn());
1261        O << MAI->getCommentString()
1262          << " least significant halfword of x86_fp80 ~"
1263          << DoubleVal.convertToDouble();
1264      }
1265      O << '\n';
1266      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1267      if (VerboseAsm) {
1268        O.PadToColumn(MAI->getCommentColumn());
1269        O << MAI->getCommentString()
1270          << " next halfword";
1271      }
1272      O << '\n';
1273      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1274      if (VerboseAsm) {
1275        O.PadToColumn(MAI->getCommentColumn());
1276        O << MAI->getCommentString()
1277          << " next halfword";
1278      }
1279      O << '\n';
1280      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1281      if (VerboseAsm) {
1282        O.PadToColumn(MAI->getCommentColumn());
1283        O << MAI->getCommentString()
1284          << " next halfword";
1285      }
1286      O << '\n';
1287      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1288      if (VerboseAsm) {
1289        O.PadToColumn(MAI->getCommentColumn());
1290        O << MAI->getCommentString()
1291          << " most significant halfword";
1292      }
1293      O << '\n';
1294    }
1295    EmitZeros(TD->getTypeAllocSize(Type::getX86_FP80Ty(Context)) -
1296              TD->getTypeStoreSize(Type::getX86_FP80Ty(Context)), AddrSpace);
1297    return;
1298  }
1299
1300  if (CFP->getType()->isPPC_FP128Ty()) {
1301    // all long double variants are printed as hex
1302    // api needed to prevent premature destruction
1303    APInt api = CFP->getValueAPF().bitcastToAPInt();
1304    const uint64_t *p = api.getRawData();
1305    if (TD->isBigEndian()) {
1306      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1307      if (VerboseAsm) {
1308        O.PadToColumn(MAI->getCommentColumn());
1309        O << MAI->getCommentString()
1310          << " most significant word of ppc_fp128";
1311      }
1312      O << '\n';
1313      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1314      if (VerboseAsm) {
1315        O.PadToColumn(MAI->getCommentColumn());
1316        O << MAI->getCommentString()
1317        << " next word";
1318      }
1319      O << '\n';
1320      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1321      if (VerboseAsm) {
1322        O.PadToColumn(MAI->getCommentColumn());
1323        O << MAI->getCommentString()
1324          << " next word";
1325      }
1326      O << '\n';
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";
1332      }
1333      O << '\n';
1334     } else {
1335      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
1336      if (VerboseAsm) {
1337        O.PadToColumn(MAI->getCommentColumn());
1338        O << MAI->getCommentString()
1339          << " least significant word of ppc_fp128";
1340      }
1341      O << '\n';
1342      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1343      if (VerboseAsm) {
1344        O.PadToColumn(MAI->getCommentColumn());
1345        O << MAI->getCommentString()
1346          << " next word";
1347      }
1348      O << '\n';
1349      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1350      if (VerboseAsm) {
1351        O.PadToColumn(MAI->getCommentColumn());
1352        O << MAI->getCommentString()
1353          << " next word";
1354      }
1355      O << '\n';
1356      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1357      if (VerboseAsm) {
1358        O.PadToColumn(MAI->getCommentColumn());
1359        O << MAI->getCommentString()
1360          << " most significant word";
1361      }
1362      O << '\n';
1363    }
1364    return;
1365  } else llvm_unreachable("Floating point constant type not handled");
1366}
1367
1368void AsmPrinter::EmitGlobalConstantLargeInt(const ConstantInt *CI,
1369                                            unsigned AddrSpace) {
1370  const TargetData *TD = TM.getTargetData();
1371  unsigned BitWidth = CI->getBitWidth();
1372  assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
1373
1374  // We don't expect assemblers to support integer data directives
1375  // for more than 64 bits, so we emit the data in at most 64-bit
1376  // quantities at a time.
1377  const uint64_t *RawData = CI->getValue().getRawData();
1378  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1379    uint64_t Val;
1380    if (TD->isBigEndian())
1381      Val = RawData[e - i - 1];
1382    else
1383      Val = RawData[i];
1384
1385    if (MAI->getData64bitsDirective(AddrSpace)) {
1386      O << MAI->getData64bitsDirective(AddrSpace) << Val << '\n';
1387      continue;
1388    }
1389
1390    // Emit two 32-bit chunks, order depends on endianness.
1391    unsigned FirstChunk = unsigned(Val), SecondChunk = unsigned(Val >> 32);
1392    const char *FirstName = " least", *SecondName = " most";
1393    if (TD->isBigEndian()) {
1394      std::swap(FirstChunk, SecondChunk);
1395      std::swap(FirstName, SecondName);
1396    }
1397
1398    O << MAI->getData32bitsDirective(AddrSpace) << FirstChunk;
1399    if (VerboseAsm) {
1400      O.PadToColumn(MAI->getCommentColumn());
1401      O << MAI->getCommentString()
1402        << FirstName << " significant half of i64 " << Val;
1403    }
1404    O << '\n';
1405
1406    O << MAI->getData32bitsDirective(AddrSpace) << SecondChunk;
1407    if (VerboseAsm) {
1408      O.PadToColumn(MAI->getCommentColumn());
1409      O << MAI->getCommentString()
1410        << SecondName << " significant half of i64 " << Val;
1411    }
1412    O << '\n';
1413  }
1414}
1415
1416/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1417void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1418  const TargetData *TD = TM.getTargetData();
1419  const Type *type = CV->getType();
1420  unsigned Size = TD->getTypeAllocSize(type);
1421
1422  if (CV->isNullValue() || isa<UndefValue>(CV)) {
1423    EmitZeros(Size, AddrSpace);
1424    return;
1425  }
1426
1427  if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
1428    EmitGlobalConstantArray(CVA , AddrSpace);
1429    return;
1430  }
1431
1432  if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
1433    EmitGlobalConstantStruct(CVS, AddrSpace);
1434    return;
1435  }
1436
1437  if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
1438    EmitGlobalConstantFP(CFP, AddrSpace);
1439    return;
1440  }
1441
1442  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1443    // If we can directly emit an 8-byte constant, do it.
1444    if (Size == 8)
1445      if (const char *Data64Dir = MAI->getData64bitsDirective(AddrSpace)) {
1446        O << Data64Dir << CI->getZExtValue() << '\n';
1447        return;
1448      }
1449
1450    // Small integers are handled below; large integers are handled here.
1451    if (Size > 4) {
1452      EmitGlobalConstantLargeInt(CI, AddrSpace);
1453      return;
1454    }
1455  }
1456
1457  if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) {
1458    EmitGlobalConstantVector(CP);
1459    return;
1460  }
1461
1462  printDataDirective(type, AddrSpace);
1463  EmitConstantValueOnly(CV);
1464  if (VerboseAsm) {
1465    if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1466      SmallString<40> S;
1467      CI->getValue().toStringUnsigned(S, 16);
1468      O.PadToColumn(MAI->getCommentColumn());
1469      O << MAI->getCommentString() << " 0x" << S.str();
1470    }
1471  }
1472  O << '\n';
1473}
1474
1475void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1476  // Target doesn't support this yet!
1477  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1478}
1479
1480/// PrintSpecial - Print information related to the specified machine instr
1481/// that is independent of the operand, and may be independent of the instr
1482/// itself.  This can be useful for portably encoding the comment character
1483/// or other bits of target-specific knowledge into the asmstrings.  The
1484/// syntax used is ${:comment}.  Targets can override this to add support
1485/// for their own strange codes.
1486void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1487  if (!strcmp(Code, "private")) {
1488    O << MAI->getPrivateGlobalPrefix();
1489  } else if (!strcmp(Code, "comment")) {
1490    if (VerboseAsm)
1491      O << MAI->getCommentString();
1492  } else if (!strcmp(Code, "uid")) {
1493    // Comparing the address of MI isn't sufficient, because machineinstrs may
1494    // be allocated to the same address across functions.
1495    const Function *ThisF = MI->getParent()->getParent()->getFunction();
1496
1497    // If this is a new LastFn instruction, bump the counter.
1498    if (LastMI != MI || LastFn != ThisF) {
1499      ++Counter;
1500      LastMI = MI;
1501      LastFn = ThisF;
1502    }
1503    O << Counter;
1504  } else {
1505    std::string msg;
1506    raw_string_ostream Msg(msg);
1507    Msg << "Unknown special formatter '" << Code
1508         << "' for machine instr: " << *MI;
1509    llvm_report_error(Msg.str());
1510  }
1511}
1512
1513/// processDebugLoc - Processes the debug information of each machine
1514/// instruction's DebugLoc.
1515void AsmPrinter::processDebugLoc(const MachineInstr *MI,
1516                                 bool BeforePrintingInsn) {
1517  if (!MAI || !DW || !MAI->doesSupportDebugInformation()
1518      || !DW->ShouldEmitDwarfDebug())
1519    return;
1520  DebugLoc DL = MI->getDebugLoc();
1521  if (DL.isUnknown())
1522    return;
1523  DILocation CurDLT = MF->getDILocation(DL);
1524  if (CurDLT.getScope().isNull())
1525    return;
1526
1527  if (BeforePrintingInsn) {
1528    if (CurDLT.getNode() != PrevDLT) {
1529      unsigned L = DW->RecordSourceLine(CurDLT.getLineNumber(),
1530                                        CurDLT.getColumnNumber(),
1531                                        CurDLT.getScope().getNode());
1532      printLabel(L);
1533      O << '\n';
1534      DW->BeginScope(MI, L);
1535      PrevDLT = CurDLT.getNode();
1536    }
1537  } else {
1538    // After printing instruction
1539    DW->EndScope(MI);
1540  }
1541}
1542
1543
1544/// printInlineAsm - This method formats and prints the specified machine
1545/// instruction that is an inline asm.
1546void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1547  unsigned NumOperands = MI->getNumOperands();
1548
1549  // Count the number of register definitions.
1550  unsigned NumDefs = 0;
1551  for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1552       ++NumDefs)
1553    assert(NumDefs != NumOperands-1 && "No asm string?");
1554
1555  assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1556
1557  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1558  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1559
1560  O << '\t';
1561
1562  // If this asmstr is empty, just print the #APP/#NOAPP markers.
1563  // These are useful to see where empty asm's wound up.
1564  if (AsmStr[0] == 0) {
1565    O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1566    O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
1567    return;
1568  }
1569
1570  O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1571
1572  // The variant of the current asmprinter.
1573  int AsmPrinterVariant = MAI->getAssemblerDialect();
1574
1575  int CurVariant = -1;            // The number of the {.|.|.} region we are in.
1576  const char *LastEmitted = AsmStr; // One past the last character emitted.
1577
1578  while (*LastEmitted) {
1579    switch (*LastEmitted) {
1580    default: {
1581      // Not a special case, emit the string section literally.
1582      const char *LiteralEnd = LastEmitted+1;
1583      while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1584             *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1585        ++LiteralEnd;
1586      if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1587        O.write(LastEmitted, LiteralEnd-LastEmitted);
1588      LastEmitted = LiteralEnd;
1589      break;
1590    }
1591    case '\n':
1592      ++LastEmitted;   // Consume newline character.
1593      O << '\n';       // Indent code with newline.
1594      break;
1595    case '$': {
1596      ++LastEmitted;   // Consume '$' character.
1597      bool Done = true;
1598
1599      // Handle escapes.
1600      switch (*LastEmitted) {
1601      default: Done = false; break;
1602      case '$':     // $$ -> $
1603        if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1604          O << '$';
1605        ++LastEmitted;  // Consume second '$' character.
1606        break;
1607      case '(':             // $( -> same as GCC's { character.
1608        ++LastEmitted;      // Consume '(' character.
1609        if (CurVariant != -1) {
1610          llvm_report_error("Nested variants found in inline asm string: '"
1611                            + std::string(AsmStr) + "'");
1612        }
1613        CurVariant = 0;     // We're in the first variant now.
1614        break;
1615      case '|':
1616        ++LastEmitted;  // consume '|' character.
1617        if (CurVariant == -1)
1618          O << '|';       // this is gcc's behavior for | outside a variant
1619        else
1620          ++CurVariant;   // We're in the next variant.
1621        break;
1622      case ')':         // $) -> same as GCC's } char.
1623        ++LastEmitted;  // consume ')' character.
1624        if (CurVariant == -1)
1625          O << '}';     // this is gcc's behavior for } outside a variant
1626        else
1627          CurVariant = -1;
1628        break;
1629      }
1630      if (Done) break;
1631
1632      bool HasCurlyBraces = false;
1633      if (*LastEmitted == '{') {     // ${variable}
1634        ++LastEmitted;               // Consume '{' character.
1635        HasCurlyBraces = true;
1636      }
1637
1638      // If we have ${:foo}, then this is not a real operand reference, it is a
1639      // "magic" string reference, just like in .td files.  Arrange to call
1640      // PrintSpecial.
1641      if (HasCurlyBraces && *LastEmitted == ':') {
1642        ++LastEmitted;
1643        const char *StrStart = LastEmitted;
1644        const char *StrEnd = strchr(StrStart, '}');
1645        if (StrEnd == 0) {
1646          llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1647                            + std::string(AsmStr) + "'");
1648        }
1649
1650        std::string Val(StrStart, StrEnd);
1651        PrintSpecial(MI, Val.c_str());
1652        LastEmitted = StrEnd+1;
1653        break;
1654      }
1655
1656      const char *IDStart = LastEmitted;
1657      char *IDEnd;
1658      errno = 0;
1659      long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1660      if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1661        llvm_report_error("Bad $ operand number in inline asm string: '"
1662                          + std::string(AsmStr) + "'");
1663      }
1664      LastEmitted = IDEnd;
1665
1666      char Modifier[2] = { 0, 0 };
1667
1668      if (HasCurlyBraces) {
1669        // If we have curly braces, check for a modifier character.  This
1670        // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1671        if (*LastEmitted == ':') {
1672          ++LastEmitted;    // Consume ':' character.
1673          if (*LastEmitted == 0) {
1674            llvm_report_error("Bad ${:} expression in inline asm string: '"
1675                              + std::string(AsmStr) + "'");
1676          }
1677
1678          Modifier[0] = *LastEmitted;
1679          ++LastEmitted;    // Consume modifier character.
1680        }
1681
1682        if (*LastEmitted != '}') {
1683          llvm_report_error("Bad ${} expression in inline asm string: '"
1684                            + std::string(AsmStr) + "'");
1685        }
1686        ++LastEmitted;    // Consume '}' character.
1687      }
1688
1689      if ((unsigned)Val >= NumOperands-1) {
1690        llvm_report_error("Invalid $ operand number in inline asm string: '"
1691                          + std::string(AsmStr) + "'");
1692      }
1693
1694      // Okay, we finally have a value number.  Ask the target to print this
1695      // operand!
1696      if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1697        unsigned OpNo = 1;
1698
1699        bool Error = false;
1700
1701        // Scan to find the machine operand number for the operand.
1702        for (; Val; --Val) {
1703          if (OpNo >= MI->getNumOperands()) break;
1704          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1705          OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1706        }
1707
1708        if (OpNo >= MI->getNumOperands()) {
1709          Error = true;
1710        } else {
1711          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1712          ++OpNo;  // Skip over the ID number.
1713
1714          if (Modifier[0] == 'l')  // labels are target independent
1715            O << *GetMBBSymbol(MI->getOperand(OpNo).getMBB()->getNumber());
1716          else {
1717            AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1718            if ((OpFlags & 7) == 4) {
1719              Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1720                                                Modifier[0] ? Modifier : 0);
1721            } else {
1722              Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1723                                          Modifier[0] ? Modifier : 0);
1724            }
1725          }
1726        }
1727        if (Error) {
1728          std::string msg;
1729          raw_string_ostream Msg(msg);
1730          Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n";
1731          MI->print(Msg);
1732          llvm_report_error(Msg.str());
1733        }
1734      }
1735      break;
1736    }
1737    }
1738  }
1739  O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd();
1740}
1741
1742/// printImplicitDef - This method prints the specified machine instruction
1743/// that is an implicit def.
1744void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1745  if (!VerboseAsm) return;
1746  O.PadToColumn(MAI->getCommentColumn());
1747  O << MAI->getCommentString() << " implicit-def: "
1748    << TRI->getName(MI->getOperand(0).getReg());
1749}
1750
1751void AsmPrinter::printKill(const MachineInstr *MI) const {
1752  if (!VerboseAsm) return;
1753  O.PadToColumn(MAI->getCommentColumn());
1754  O << MAI->getCommentString() << " kill:";
1755  for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) {
1756    const MachineOperand &op = MI->getOperand(n);
1757    assert(op.isReg() && "KILL instruction must have only register operands");
1758    O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>");
1759  }
1760}
1761
1762/// printLabel - This method prints a local label used by debug and
1763/// exception handling tables.
1764void AsmPrinter::printLabel(const MachineInstr *MI) const {
1765  printLabel(MI->getOperand(0).getImm());
1766}
1767
1768void AsmPrinter::printLabel(unsigned Id) const {
1769  O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':';
1770}
1771
1772/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1773/// instruction, using the specified assembler variant.  Targets should
1774/// override this to format as appropriate.
1775bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1776                                 unsigned AsmVariant, const char *ExtraCode) {
1777  // Target doesn't support this yet!
1778  return true;
1779}
1780
1781bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1782                                       unsigned AsmVariant,
1783                                       const char *ExtraCode) {
1784  // Target doesn't support this yet!
1785  return true;
1786}
1787
1788MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA,
1789                                            const char *Suffix) const {
1790  return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock(), Suffix);
1791}
1792
1793MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F,
1794                                            const BasicBlock *BB,
1795                                            const char *Suffix) const {
1796  assert(BB->hasName() &&
1797         "Address of anonymous basic block not supported yet!");
1798
1799  // This code must use the function name itself, and not the function number,
1800  // since it must be possible to generate the label name from within other
1801  // functions.
1802  SmallString<60> FnName;
1803  Mang->getNameWithPrefix(FnName, F, false);
1804
1805  // FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME!
1806  SmallString<60> NameResult;
1807  Mang->getNameWithPrefix(NameResult,
1808                          StringRef("BA") + Twine((unsigned)FnName.size()) +
1809                          "_" + FnName.str() + "_" + BB->getName() + Suffix,
1810                          Mangler::Private);
1811
1812  return OutContext.GetOrCreateSymbol(NameResult.str());
1813}
1814
1815MCSymbol *AsmPrinter::GetMBBSymbol(unsigned MBBID) const {
1816  SmallString<60> Name;
1817  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "BB"
1818    << getFunctionNumber() << '_' << MBBID;
1819
1820  return OutContext.GetOrCreateSymbol(Name.str());
1821}
1822
1823/// GetGlobalValueSymbol - Return the MCSymbol for the specified global
1824/// value.
1825MCSymbol *AsmPrinter::GetGlobalValueSymbol(const GlobalValue *GV) const {
1826  SmallString<60> NameStr;
1827  Mang->getNameWithPrefix(NameStr, GV, false);
1828  return OutContext.GetOrCreateSymbol(NameStr.str());
1829}
1830
1831/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
1832/// global value name as its base, with the specified suffix, and where the
1833/// symbol is forced to have private linkage if ForcePrivate is true.
1834MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
1835                                                   StringRef Suffix,
1836                                                   bool ForcePrivate) const {
1837  SmallString<60> NameStr;
1838  Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
1839  NameStr.append(Suffix.begin(), Suffix.end());
1840  return OutContext.GetOrCreateSymbol(NameStr.str());
1841}
1842
1843/// GetExternalSymbolSymbol - Return the MCSymbol for the specified
1844/// ExternalSymbol.
1845MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
1846  SmallString<60> NameStr;
1847  Mang->getNameWithPrefix(NameStr, Sym);
1848  return OutContext.GetOrCreateSymbol(NameStr.str());
1849}
1850
1851
1852/// EmitBasicBlockStart - This method prints the label for the specified
1853/// MachineBasicBlock, an alignment (if present) and a comment describing
1854/// it if appropriate.
1855void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
1856  // Emit an alignment directive for this block, if needed.
1857  if (unsigned Align = MBB->getAlignment())
1858    EmitAlignment(Log2_32(Align));
1859
1860  // If the block has its address taken, emit a special label to satisfy
1861  // references to the block. This is done so that we don't need to
1862  // remember the number of this label, and so that we can make
1863  // forward references to labels without knowing what their numbers
1864  // will be.
1865  if (MBB->hasAddressTaken()) {
1866    O << *GetBlockAddressSymbol(MBB->getBasicBlock()->getParent(),
1867                                MBB->getBasicBlock());
1868    O << ':';
1869    if (VerboseAsm) {
1870      O.PadToColumn(MAI->getCommentColumn());
1871      O << MAI->getCommentString() << " Address Taken";
1872    }
1873    O << '\n';
1874  }
1875
1876  // Print the main label for the block.
1877  if (MBB->pred_empty() || MBB->isOnlyReachableByFallthrough()) {
1878    if (VerboseAsm)
1879      O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':';
1880  } else {
1881    O << *GetMBBSymbol(MBB->getNumber()) << ':';
1882    if (!VerboseAsm)
1883      O << '\n';
1884  }
1885
1886  // Print some comments to accompany the label.
1887  if (VerboseAsm) {
1888    if (const BasicBlock *BB = MBB->getBasicBlock())
1889      if (BB->hasName()) {
1890        O.PadToColumn(MAI->getCommentColumn());
1891        O << MAI->getCommentString() << ' ';
1892        WriteAsOperand(O, BB, /*PrintType=*/false);
1893      }
1894
1895    EmitComments(*MBB);
1896    O << '\n';
1897  }
1898}
1899
1900/// printPICJumpTableSetLabel - This method prints a set label for the
1901/// specified MachineBasicBlock for a jumptable entry.
1902void AsmPrinter::printPICJumpTableSetLabel(unsigned uid,
1903                                           const MachineBasicBlock *MBB) const {
1904  if (!MAI->getSetDirective())
1905    return;
1906
1907  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1908    << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ','
1909    << *GetMBBSymbol(MBB->getNumber())
1910    << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1911    << '_' << uid << '\n';
1912}
1913
1914void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
1915                                           const MachineBasicBlock *MBB) const {
1916  if (!MAI->getSetDirective())
1917    return;
1918
1919  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1920    << getFunctionNumber() << '_' << uid << '_' << uid2
1921    << "_set_" << MBB->getNumber() << ','
1922    << *GetMBBSymbol(MBB->getNumber())
1923    << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1924    << '_' << uid << '_' << uid2 << '\n';
1925}
1926
1927/// printDataDirective - This method prints the asm directive for the
1928/// specified type.
1929void AsmPrinter::printDataDirective(const Type *type, unsigned AddrSpace) {
1930  const TargetData *TD = TM.getTargetData();
1931  switch (type->getTypeID()) {
1932  case Type::FloatTyID: case Type::DoubleTyID:
1933  case Type::X86_FP80TyID: case Type::FP128TyID: case Type::PPC_FP128TyID:
1934    assert(0 && "Should have already output floating point constant.");
1935  default:
1936    assert(0 && "Can't handle printing this type of thing");
1937  case Type::IntegerTyID: {
1938    unsigned BitWidth = cast<IntegerType>(type)->getBitWidth();
1939    if (BitWidth <= 8)
1940      O << MAI->getData8bitsDirective(AddrSpace);
1941    else if (BitWidth <= 16)
1942      O << MAI->getData16bitsDirective(AddrSpace);
1943    else if (BitWidth <= 32)
1944      O << MAI->getData32bitsDirective(AddrSpace);
1945    else if (BitWidth <= 64) {
1946      assert(MAI->getData64bitsDirective(AddrSpace) &&
1947             "Target cannot handle 64-bit constant exprs!");
1948      O << MAI->getData64bitsDirective(AddrSpace);
1949    } else {
1950      llvm_unreachable("Target cannot handle given data directive width!");
1951    }
1952    break;
1953  }
1954  case Type::PointerTyID:
1955    if (TD->getPointerSize() == 8) {
1956      assert(MAI->getData64bitsDirective(AddrSpace) &&
1957             "Target cannot handle 64-bit pointer exprs!");
1958      O << MAI->getData64bitsDirective(AddrSpace);
1959    } else if (TD->getPointerSize() == 2) {
1960      O << MAI->getData16bitsDirective(AddrSpace);
1961    } else if (TD->getPointerSize() == 1) {
1962      O << MAI->getData8bitsDirective(AddrSpace);
1963    } else {
1964      O << MAI->getData32bitsDirective(AddrSpace);
1965    }
1966    break;
1967  }
1968}
1969
1970void AsmPrinter::printVisibility(const MCSymbol *Sym,
1971                                 unsigned Visibility) const {
1972  if (Visibility == GlobalValue::HiddenVisibility) {
1973    if (const char *Directive = MAI->getHiddenDirective())
1974      O << Directive << *Sym << '\n';
1975  } else if (Visibility == GlobalValue::ProtectedVisibility) {
1976    if (const char *Directive = MAI->getProtectedDirective())
1977      O << Directive << *Sym << '\n';
1978  }
1979}
1980
1981void AsmPrinter::printOffset(int64_t Offset) const {
1982  if (Offset > 0)
1983    O << '+' << Offset;
1984  else if (Offset < 0)
1985    O << Offset;
1986}
1987
1988GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1989  if (!S->usesMetadata())
1990    return 0;
1991
1992  gcp_iterator GCPI = GCMetadataPrinters.find(S);
1993  if (GCPI != GCMetadataPrinters.end())
1994    return GCPI->second;
1995
1996  const char *Name = S->getName().c_str();
1997
1998  for (GCMetadataPrinterRegistry::iterator
1999         I = GCMetadataPrinterRegistry::begin(),
2000         E = GCMetadataPrinterRegistry::end(); I != E; ++I)
2001    if (strcmp(Name, I->getName()) == 0) {
2002      GCMetadataPrinter *GMP = I->instantiate();
2003      GMP->S = S;
2004      GCMetadataPrinters.insert(std::make_pair(S, GMP));
2005      return GMP;
2006    }
2007
2008  errs() << "no GCMetadataPrinter registered for GC: " << Name << "\n";
2009  llvm_unreachable(0);
2010}
2011
2012/// EmitComments - Pretty-print comments for instructions
2013void AsmPrinter::EmitComments(const MachineInstr &MI) const {
2014  if (!VerboseAsm)
2015    return;
2016
2017  bool Newline = false;
2018
2019  if (!MI.getDebugLoc().isUnknown()) {
2020    DILocation DLT = MF->getDILocation(MI.getDebugLoc());
2021
2022    // Print source line info.
2023    O.PadToColumn(MAI->getCommentColumn());
2024    O << MAI->getCommentString() << ' ';
2025    DIScope Scope = DLT.getScope();
2026    // Omit the directory, because it's likely to be long and uninteresting.
2027    if (!Scope.isNull())
2028      O << Scope.getFilename();
2029    else
2030      O << "<unknown>";
2031    O << ':' << DLT.getLineNumber();
2032    if (DLT.getColumnNumber() != 0)
2033      O << ':' << DLT.getColumnNumber();
2034    Newline = true;
2035  }
2036
2037  // Check for spills and reloads
2038  int FI;
2039
2040  const MachineFrameInfo *FrameInfo =
2041    MI.getParent()->getParent()->getFrameInfo();
2042
2043  // We assume a single instruction only has a spill or reload, not
2044  // both.
2045  const MachineMemOperand *MMO;
2046  if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&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 Reload";
2052      Newline = true;
2053    }
2054  }
2055  else if (TM.getInstrInfo()->hasLoadFromStackSlot(&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 Reload";
2061      Newline = true;
2062    }
2063  }
2064  else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
2065    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
2066      MMO = *MI.memoperands_begin();
2067      if (Newline) O << '\n';
2068      O.PadToColumn(MAI->getCommentColumn());
2069      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Spill";
2070      Newline = true;
2071    }
2072  }
2073  else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
2074    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
2075      if (Newline) O << '\n';
2076      O.PadToColumn(MAI->getCommentColumn());
2077      O << MAI->getCommentString() << ' '
2078        << MMO->getSize() << "-byte Folded Spill";
2079      Newline = true;
2080    }
2081  }
2082
2083  // Check for spill-induced copies
2084  unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
2085  if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg,
2086                                      SrcSubIdx, DstSubIdx)) {
2087    if (MI.getAsmPrinterFlag(ReloadReuse)) {
2088      if (Newline) O << '\n';
2089      O.PadToColumn(MAI->getCommentColumn());
2090      O << MAI->getCommentString() << " Reload Reuse";
2091    }
2092  }
2093}
2094
2095/// PrintChildLoopComment - Print comments about child loops within
2096/// the loop for this basic block, with nesting.
2097///
2098static void PrintChildLoopComment(formatted_raw_ostream &O,
2099                                  const MachineLoop *loop,
2100                                  const MCAsmInfo *MAI,
2101                                  int FunctionNumber) {
2102  // Add child loop information
2103  for(MachineLoop::iterator cl = loop->begin(),
2104        clend = loop->end();
2105      cl != clend;
2106      ++cl) {
2107    MachineBasicBlock *Header = (*cl)->getHeader();
2108    assert(Header && "No header for loop");
2109
2110    O << '\n';
2111    O.PadToColumn(MAI->getCommentColumn());
2112
2113    O << MAI->getCommentString();
2114    O.indent(((*cl)->getLoopDepth()-1)*2)
2115      << " Child Loop BB" << FunctionNumber << "_"
2116      << Header->getNumber() << " Depth " << (*cl)->getLoopDepth();
2117
2118    PrintChildLoopComment(O, *cl, MAI, FunctionNumber);
2119  }
2120}
2121
2122/// EmitComments - Pretty-print comments for basic blocks
2123void AsmPrinter::EmitComments(const MachineBasicBlock &MBB) const {
2124  if (VerboseAsm) {
2125    // Add loop depth information
2126    const MachineLoop *loop = LI->getLoopFor(&MBB);
2127
2128    if (loop) {
2129      // Print a newline after bb# annotation.
2130      O << "\n";
2131      O.PadToColumn(MAI->getCommentColumn());
2132      O << MAI->getCommentString() << " Loop Depth " << loop->getLoopDepth()
2133        << '\n';
2134
2135      O.PadToColumn(MAI->getCommentColumn());
2136
2137      MachineBasicBlock *Header = loop->getHeader();
2138      assert(Header && "No header for loop");
2139
2140      if (Header == &MBB) {
2141        O << MAI->getCommentString() << " Loop Header";
2142        PrintChildLoopComment(O, loop, MAI, getFunctionNumber());
2143      }
2144      else {
2145        O << MAI->getCommentString() << " Loop Header is BB"
2146          << getFunctionNumber() << "_" << loop->getHeader()->getNumber();
2147      }
2148
2149      if (loop->empty()) {
2150        O << '\n';
2151        O.PadToColumn(MAI->getCommentColumn());
2152        O << MAI->getCommentString() << " Inner Loop";
2153      }
2154
2155      // Add parent loop information
2156      for (const MachineLoop *CurLoop = loop->getParentLoop();
2157           CurLoop;
2158           CurLoop = CurLoop->getParentLoop()) {
2159        MachineBasicBlock *Header = CurLoop->getHeader();
2160        assert(Header && "No header for loop");
2161
2162        O << '\n';
2163        O.PadToColumn(MAI->getCommentColumn());
2164        O << MAI->getCommentString();
2165        O.indent((CurLoop->getLoopDepth()-1)*2)
2166          << " Inside Loop BB" << getFunctionNumber() << "_"
2167          << Header->getNumber() << " Depth " << CurLoop->getLoopDepth();
2168      }
2169    }
2170  }
2171}
2172