AsmPrinter.cpp revision 10e7c60c0444a766c256f6c7c922e43963590a5c 
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#define DEBUG_TYPE "asm-printer"
15#include "llvm/CodeGen/AsmPrinter.h"
16#include "llvm/Assembly/Writer.h"
17#include "llvm/DerivedTypes.h"
18#include "llvm/Constants.h"
19#include "llvm/Module.h"
20#include "llvm/CodeGen/DwarfWriter.h"
21#include "llvm/CodeGen/GCMetadataPrinter.h"
22#include "llvm/CodeGen/MachineConstantPool.h"
23#include "llvm/CodeGen/MachineFrameInfo.h"
24#include "llvm/CodeGen/MachineFunction.h"
25#include "llvm/CodeGen/MachineJumpTableInfo.h"
26#include "llvm/CodeGen/MachineLoopInfo.h"
27#include "llvm/CodeGen/MachineModuleInfo.h"
28#include "llvm/Analysis/DebugInfo.h"
29#include "llvm/MC/MCContext.h"
30#include "llvm/MC/MCExpr.h"
31#include "llvm/MC/MCInst.h"
32#include "llvm/MC/MCSection.h"
33#include "llvm/MC/MCStreamer.h"
34#include "llvm/MC/MCSymbol.h"
35#include "llvm/MC/MCAsmInfo.h"
36#include "llvm/Target/Mangler.h"
37#include "llvm/Target/TargetData.h"
38#include "llvm/Target/TargetInstrInfo.h"
39#include "llvm/Target/TargetLowering.h"
40#include "llvm/Target/TargetLoweringObjectFile.h"
41#include "llvm/Target/TargetOptions.h"
42#include "llvm/Target/TargetRegisterInfo.h"
43#include "llvm/ADT/SmallPtrSet.h"
44#include "llvm/ADT/SmallString.h"
45#include "llvm/ADT/Statistic.h"
46#include "llvm/Support/CommandLine.h"
47#include "llvm/Support/Debug.h"
48#include "llvm/Support/ErrorHandling.h"
49#include "llvm/Support/Format.h"
50#include "llvm/Support/FormattedStream.h"
51#include <cerrno>
52using namespace llvm;
53
54STATISTIC(EmittedInsts, "Number of machine instrs printed");
55
56static cl::opt<cl::boolOrDefault>
57AsmVerbose("asm-verbose", cl::desc("Add comments to directives."),
58           cl::init(cl::BOU_UNSET));
59
60static bool getVerboseAsm(bool VDef) {
61  switch (AsmVerbose) {
62  default:
63  case cl::BOU_UNSET: return VDef;
64  case cl::BOU_TRUE:  return true;
65  case cl::BOU_FALSE: return false;
66  }
67}
68
69char AsmPrinter::ID = 0;
70AsmPrinter::AsmPrinter(formatted_raw_ostream &o, TargetMachine &tm,
71                       const MCAsmInfo *T, bool VDef)
72  : MachineFunctionPass(&ID), O(o),
73    TM(tm), MAI(T), TRI(tm.getRegisterInfo()),
74
75    OutContext(*new MCContext()),
76    // FIXME: Pass instprinter to streamer.
77    OutStreamer(*createAsmStreamer(OutContext, O, *T,
78                                   TM.getTargetData()->isLittleEndian(),
79                                   getVerboseAsm(VDef), 0)),
80
81    LastMI(0), LastFn(0), Counter(~0U), PrevDLT(NULL) {
82  DW = 0; MMI = 0;
83  VerboseAsm = getVerboseAsm(VDef);
84}
85
86AsmPrinter::~AsmPrinter() {
87  for (gcp_iterator I = GCMetadataPrinters.begin(),
88                    E = GCMetadataPrinters.end(); I != E; ++I)
89    delete I->second;
90
91  delete &OutStreamer;
92  delete &OutContext;
93}
94
95/// getFunctionNumber - Return a unique ID for the current function.
96///
97unsigned AsmPrinter::getFunctionNumber() const {
98  return MF->getFunctionNumber();
99}
100
101TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
102  return TM.getTargetLowering()->getObjFileLowering();
103}
104
105/// getCurrentSection() - Return the current section we are emitting to.
106const MCSection *AsmPrinter::getCurrentSection() const {
107  return OutStreamer.getCurrentSection();
108}
109
110
111void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
112  AU.setPreservesAll();
113  MachineFunctionPass::getAnalysisUsage(AU);
114  AU.addRequired<GCModuleInfo>();
115  if (VerboseAsm)
116    AU.addRequired<MachineLoopInfo>();
117}
118
119bool AsmPrinter::doInitialization(Module &M) {
120  // Initialize TargetLoweringObjectFile.
121  const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
122    .Initialize(OutContext, TM);
123
124  Mang = new Mangler(*MAI);
125
126  // Allow the target to emit any magic that it wants at the start of the file.
127  EmitStartOfAsmFile(M);
128
129  // Very minimal debug info. It is ignored if we emit actual debug info. If we
130  // don't, this at least helps the user find where a global came from.
131  if (MAI->hasSingleParameterDotFile()) {
132    // .file "foo.c"
133    OutStreamer.EmitFileDirective(M.getModuleIdentifier());
134  }
135
136  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
137  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
138  for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
139    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
140      MP->beginAssembly(O, *this, *MAI);
141
142  if (!M.getModuleInlineAsm().empty())
143    O << MAI->getCommentString() << " Start of file scope inline assembly\n"
144      << M.getModuleInlineAsm()
145      << '\n' << MAI->getCommentString()
146      << " End of file scope inline assembly\n";
147
148  MMI = getAnalysisIfAvailable<MachineModuleInfo>();
149  if (MMI)
150    MMI->AnalyzeModule(M);
151  DW = getAnalysisIfAvailable<DwarfWriter>();
152  if (DW)
153    DW->BeginModule(&M, MMI, O, this, MAI);
154
155  return false;
156}
157
158void AsmPrinter::EmitLinkage(unsigned Linkage, MCSymbol *GVSym) const {
159  switch ((GlobalValue::LinkageTypes)Linkage) {
160  case GlobalValue::CommonLinkage:
161  case GlobalValue::LinkOnceAnyLinkage:
162  case GlobalValue::LinkOnceODRLinkage:
163  case GlobalValue::WeakAnyLinkage:
164  case GlobalValue::WeakODRLinkage:
165  case GlobalValue::LinkerPrivateLinkage:
166    if (MAI->getWeakDefDirective() != 0) {
167      // .globl _foo
168      OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
169      // .weak_definition _foo
170      OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
171    } else if (const char *LinkOnce = MAI->getLinkOnceDirective()) {
172      // .globl _foo
173      OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
174      // FIXME: linkonce should be a section attribute, handled by COFF Section
175      // assignment.
176      // http://sourceware.org/binutils/docs-2.20/as/Linkonce.html#Linkonce
177      // .linkonce discard
178      // FIXME: It would be nice to use .linkonce samesize for non-common
179      // globals.
180      O << LinkOnce;
181    } else {
182      // .weak _foo
183      OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
184    }
185    break;
186  case GlobalValue::DLLExportLinkage:
187  case GlobalValue::AppendingLinkage:
188    // FIXME: appending linkage variables should go into a section of
189    // their name or something.  For now, just emit them as external.
190  case GlobalValue::ExternalLinkage:
191    // If external or appending, declare as a global symbol.
192    // .globl _foo
193    OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
194    break;
195  case GlobalValue::PrivateLinkage:
196  case GlobalValue::InternalLinkage:
197    break;
198  default:
199    llvm_unreachable("Unknown linkage type!");
200  }
201}
202
203
204/// EmitGlobalVariable - Emit the specified global variable to the .s file.
205void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
206  if (!GV->hasInitializer())   // External globals require no code.
207    return;
208
209  // Check to see if this is a special global used by LLVM, if so, emit it.
210  if (EmitSpecialLLVMGlobal(GV))
211    return;
212
213  MCSymbol *GVSym = GetGlobalValueSymbol(GV);
214  EmitVisibility(GVSym, GV->getVisibility());
215
216  if (MAI->hasDotTypeDotSizeDirective())
217    OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
218
219  SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
220
221  const TargetData *TD = TM.getTargetData();
222  unsigned Size = TD->getTypeAllocSize(GV->getType()->getElementType());
223  unsigned AlignLog = TD->getPreferredAlignmentLog(GV);
224
225  // Handle common and BSS local symbols (.lcomm).
226  if (GVKind.isCommon() || GVKind.isBSSLocal()) {
227    if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
228
229    if (VerboseAsm) {
230      WriteAsOperand(OutStreamer.GetCommentOS(), GV,
231                     /*PrintType=*/false, GV->getParent());
232      OutStreamer.GetCommentOS() << '\n';
233    }
234
235    // Handle common symbols.
236    if (GVKind.isCommon()) {
237      // .comm _foo, 42, 4
238      OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
239      return;
240    }
241
242    // Handle local BSS symbols.
243    if (MAI->hasMachoZeroFillDirective()) {
244      const MCSection *TheSection =
245        getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
246      // .zerofill __DATA, __bss, _foo, 400, 5
247      OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
248      return;
249    }
250
251    if (MAI->hasLCOMMDirective()) {
252      // .lcomm _foo, 42
253      OutStreamer.EmitLocalCommonSymbol(GVSym, Size);
254      return;
255    }
256
257    // .local _foo
258    OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Local);
259    // .comm _foo, 42, 4
260    OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
261    return;
262  }
263
264  const MCSection *TheSection =
265    getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
266
267  // Handle the zerofill directive on darwin, which is a special form of BSS
268  // emission.
269  if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
270    // .globl _foo
271    OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
272    // .zerofill __DATA, __common, _foo, 400, 5
273    OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
274    return;
275  }
276
277  OutStreamer.SwitchSection(TheSection);
278
279  EmitLinkage(GV->getLinkage(), GVSym);
280  EmitAlignment(AlignLog, GV);
281
282  if (VerboseAsm) {
283    WriteAsOperand(OutStreamer.GetCommentOS(), GV,
284                   /*PrintType=*/false, GV->getParent());
285    OutStreamer.GetCommentOS() << '\n';
286  }
287  OutStreamer.EmitLabel(GVSym);
288
289  EmitGlobalConstant(GV->getInitializer());
290
291  if (MAI->hasDotTypeDotSizeDirective())
292    // .size foo, 42
293    OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext));
294
295  OutStreamer.AddBlankLine();
296}
297
298/// EmitFunctionHeader - This method emits the header for the current
299/// function.
300void AsmPrinter::EmitFunctionHeader() {
301  // Print out constants referenced by the function
302  EmitConstantPool();
303
304  // Print the 'header' of function.
305  const Function *F = MF->getFunction();
306
307  OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
308  EmitVisibility(CurrentFnSym, F->getVisibility());
309
310  EmitLinkage(F->getLinkage(), CurrentFnSym);
311  EmitAlignment(MF->getAlignment(), F);
312
313  if (MAI->hasDotTypeDotSizeDirective())
314    OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
315
316  if (VerboseAsm) {
317    WriteAsOperand(OutStreamer.GetCommentOS(), F,
318                   /*PrintType=*/false, F->getParent());
319    OutStreamer.GetCommentOS() << '\n';
320  }
321
322  // Emit the CurrentFnSym.  This is is a virtual function to allow targets to
323  // do their wild and crazy things as required.
324  EmitFunctionEntryLabel();
325
326  // Add some workaround for linkonce linkage on Cygwin\MinGW.
327  if (MAI->getLinkOnceDirective() != 0 &&
328      (F->hasLinkOnceLinkage() || F->hasWeakLinkage()))
329    // FIXME: What is this?
330    O << "Lllvm$workaround$fake$stub$" << *CurrentFnSym << ":\n";
331
332  // Emit pre-function debug and/or EH information.
333  if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
334    DW->BeginFunction(MF);
335}
336
337/// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
338/// function.  This can be overridden by targets as required to do custom stuff.
339void AsmPrinter::EmitFunctionEntryLabel() {
340  OutStreamer.EmitLabel(CurrentFnSym);
341}
342
343
344/// EmitFunctionBody - This method emits the body and trailer for a
345/// function.
346void AsmPrinter::EmitFunctionBody() {
347
348  // Print out code for the function.
349  bool HasAnyRealCode = false;
350  for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
351       I != E; ++I) {
352    // Print a label for the basic block.
353    EmitBasicBlockStart(I);
354    for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
355         II != IE; ++II) {
356      // Print the assembly for the instruction.
357      if (!II->isLabel())
358        HasAnyRealCode = true;
359
360      ++EmittedInsts;
361
362      // FIXME: Clean up processDebugLoc.
363      processDebugLoc(II, true);
364
365      EmitInstruction(II);
366
367      if (VerboseAsm)
368        EmitComments(*II);
369      O << '\n';
370
371      // FIXME: Clean up processDebugLoc.
372      processDebugLoc(II, false);
373    }
374  }
375
376  // If the function is empty and the object file uses .subsections_via_symbols,
377  // then we need to emit *some* thing to the function body to prevent the
378  // labels from collapsing together.
379  if (MAI->hasSubsectionsViaSymbols() && !HasAnyRealCode)
380    OutStreamer.EmitIntValue(0, 1, 0/*addrspace*/);
381
382  if (MAI->hasDotTypeDotSizeDirective())
383    O << "\t.size\t" << *CurrentFnSym << ", .-" << *CurrentFnSym << '\n';
384
385  // Emit post-function debug information.
386  if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
387    DW->EndFunction(MF);
388
389  // Print out jump tables referenced by the function.
390  EmitJumpTableInfo();
391}
392
393
394bool AsmPrinter::doFinalization(Module &M) {
395  // Emit global variables.
396  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
397       I != E; ++I)
398    EmitGlobalVariable(I);
399
400  // Emit final debug information.
401  if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
402    DW->EndModule();
403
404  // If the target wants to know about weak references, print them all.
405  if (MAI->getWeakRefDirective()) {
406    // FIXME: This is not lazy, it would be nice to only print weak references
407    // to stuff that is actually used.  Note that doing so would require targets
408    // to notice uses in operands (due to constant exprs etc).  This should
409    // happen with the MC stuff eventually.
410
411    // Print out module-level global variables here.
412    for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
413         I != E; ++I) {
414      if (!I->hasExternalWeakLinkage()) continue;
415      OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(I),
416                                      MCSA_WeakReference);
417    }
418
419    for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
420      if (!I->hasExternalWeakLinkage()) continue;
421      OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(I),
422                                      MCSA_WeakReference);
423    }
424  }
425
426  if (MAI->hasSetDirective()) {
427    OutStreamer.AddBlankLine();
428    for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
429         I != E; ++I) {
430      MCSymbol *Name = GetGlobalValueSymbol(I);
431
432      const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
433      MCSymbol *Target = GetGlobalValueSymbol(GV);
434
435      if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
436        OutStreamer.EmitSymbolAttribute(Name, MCSA_Global);
437      else if (I->hasWeakLinkage())
438        OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference);
439      else
440        assert(I->hasLocalLinkage() && "Invalid alias linkage");
441
442      EmitVisibility(Name, I->getVisibility());
443
444      // Emit the directives as assignments aka .set:
445      OutStreamer.EmitAssignment(Name,
446                                 MCSymbolRefExpr::Create(Target, OutContext));
447    }
448  }
449
450  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
451  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
452  for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
453    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
454      MP->finishAssembly(O, *this, *MAI);
455
456  // If we don't have any trampolines, then we don't require stack memory
457  // to be executable. Some targets have a directive to declare this.
458  Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
459  if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
460    if (MCSection *S = MAI->getNonexecutableStackSection(OutContext))
461      OutStreamer.SwitchSection(S);
462
463  // Allow the target to emit any magic that it wants at the end of the file,
464  // after everything else has gone out.
465  EmitEndOfAsmFile(M);
466
467  delete Mang; Mang = 0;
468  DW = 0; MMI = 0;
469
470  OutStreamer.Finish();
471  return false;
472}
473
474void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
475  this->MF = &MF;
476  // Get the function symbol.
477  CurrentFnSym = GetGlobalValueSymbol(MF.getFunction());
478
479  if (VerboseAsm)
480    LI = &getAnalysis<MachineLoopInfo>();
481}
482
483namespace {
484  // SectionCPs - Keep track the alignment, constpool entries per Section.
485  struct SectionCPs {
486    const MCSection *S;
487    unsigned Alignment;
488    SmallVector<unsigned, 4> CPEs;
489    SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
490  };
491}
492
493/// EmitConstantPool - Print to the current output stream assembly
494/// representations of the constants in the constant pool MCP. This is
495/// used to print out constants which have been "spilled to memory" by
496/// the code generator.
497///
498void AsmPrinter::EmitConstantPool() {
499  const MachineConstantPool *MCP = MF->getConstantPool();
500  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
501  if (CP.empty()) return;
502
503  // Calculate sections for constant pool entries. We collect entries to go into
504  // the same section together to reduce amount of section switch statements.
505  SmallVector<SectionCPs, 4> CPSections;
506  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
507    const MachineConstantPoolEntry &CPE = CP[i];
508    unsigned Align = CPE.getAlignment();
509
510    SectionKind Kind;
511    switch (CPE.getRelocationInfo()) {
512    default: llvm_unreachable("Unknown section kind");
513    case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
514    case 1:
515      Kind = SectionKind::getReadOnlyWithRelLocal();
516      break;
517    case 0:
518    switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
519    case 4:  Kind = SectionKind::getMergeableConst4(); break;
520    case 8:  Kind = SectionKind::getMergeableConst8(); break;
521    case 16: Kind = SectionKind::getMergeableConst16();break;
522    default: Kind = SectionKind::getMergeableConst(); break;
523    }
524    }
525
526    const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
527
528    // The number of sections are small, just do a linear search from the
529    // last section to the first.
530    bool Found = false;
531    unsigned SecIdx = CPSections.size();
532    while (SecIdx != 0) {
533      if (CPSections[--SecIdx].S == S) {
534        Found = true;
535        break;
536      }
537    }
538    if (!Found) {
539      SecIdx = CPSections.size();
540      CPSections.push_back(SectionCPs(S, Align));
541    }
542
543    if (Align > CPSections[SecIdx].Alignment)
544      CPSections[SecIdx].Alignment = Align;
545    CPSections[SecIdx].CPEs.push_back(i);
546  }
547
548  // Now print stuff into the calculated sections.
549  for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
550    OutStreamer.SwitchSection(CPSections[i].S);
551    EmitAlignment(Log2_32(CPSections[i].Alignment));
552
553    unsigned Offset = 0;
554    for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
555      unsigned CPI = CPSections[i].CPEs[j];
556      MachineConstantPoolEntry CPE = CP[CPI];
557
558      // Emit inter-object padding for alignment.
559      unsigned AlignMask = CPE.getAlignment() - 1;
560      unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
561      OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/);
562
563      const Type *Ty = CPE.getType();
564      Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
565
566      // Emit the label with a comment on it.
567      if (VerboseAsm) {
568        OutStreamer.GetCommentOS() << "constant pool ";
569        WriteTypeSymbolic(OutStreamer.GetCommentOS(), CPE.getType(),
570                          MF->getFunction()->getParent());
571        OutStreamer.GetCommentOS() << '\n';
572      }
573      OutStreamer.EmitLabel(GetCPISymbol(CPI));
574
575      if (CPE.isMachineConstantPoolEntry())
576        EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
577      else
578        EmitGlobalConstant(CPE.Val.ConstVal);
579    }
580  }
581}
582
583/// EmitJumpTableInfo - Print assembly representations of the jump tables used
584/// by the current function to the current output stream.
585///
586void AsmPrinter::EmitJumpTableInfo() {
587  const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
588  if (MJTI == 0) return;
589  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
590  if (JT.empty()) return;
591
592  // Pick the directive to use to print the jump table entries, and switch to
593  // the appropriate section.
594  const Function *F = MF->getFunction();
595  bool JTInDiffSection = false;
596  if (// In PIC mode, we need to emit the jump table to the same section as the
597      // function body itself, otherwise the label differences won't make sense.
598      // FIXME: Need a better predicate for this: what about custom entries?
599      MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 ||
600      // We should also do if the section name is NULL or function is declared
601      // in discardable section
602      // FIXME: this isn't the right predicate, should be based on the MCSection
603      // for the function.
604      F->isWeakForLinker()) {
605    OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F,Mang,TM));
606  } else {
607    // Otherwise, drop it in the readonly section.
608    const MCSection *ReadOnlySection =
609      getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
610    OutStreamer.SwitchSection(ReadOnlySection);
611    JTInDiffSection = true;
612  }
613
614  EmitAlignment(Log2_32(MJTI->getEntryAlignment(*TM.getTargetData())));
615
616  for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
617    const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
618
619    // If this jump table was deleted, ignore it.
620    if (JTBBs.empty()) continue;
621
622    // For the EK_LabelDifference32 entry, if the target supports .set, emit a
623    // .set directive for each unique entry.  This reduces the number of
624    // relocations the assembler will generate for the jump table.
625    if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 &&
626        MAI->hasSetDirective()) {
627      SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets;
628      const TargetLowering *TLI = TM.getTargetLowering();
629      const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(MF,JTI,OutContext);
630      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
631        const MachineBasicBlock *MBB = JTBBs[ii];
632        if (!EmittedSets.insert(MBB)) continue;
633
634        // .set LJTSet, LBB32-base
635        const MCExpr *LHS =
636          MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext);
637        OutStreamer.EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
638                                MCBinaryExpr::CreateSub(LHS, Base, OutContext));
639      }
640    }
641
642    // On some targets (e.g. Darwin) we want to emit two consequtive labels
643    // before each jump table.  The first label is never referenced, but tells
644    // the assembler and linker the extents of the jump table object.  The
645    // second label is actually referenced by the code.
646    if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0])
647      // FIXME: This doesn't have to have any specific name, just any randomly
648      // named and numbered 'l' label would work.  Simplify GetJTISymbol.
649      OutStreamer.EmitLabel(GetJTISymbol(JTI, true));
650
651    OutStreamer.EmitLabel(GetJTISymbol(JTI));
652
653    for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
654      EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
655  }
656}
657
658/// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
659/// current stream.
660void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
661                                    const MachineBasicBlock *MBB,
662                                    unsigned UID) const {
663  const MCExpr *Value = 0;
664  switch (MJTI->getEntryKind()) {
665  case MachineJumpTableInfo::EK_Custom32:
666    Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, UID,
667                                                              OutContext);
668    break;
669  case MachineJumpTableInfo::EK_BlockAddress:
670    // EK_BlockAddress - Each entry is a plain address of block, e.g.:
671    //     .word LBB123
672    Value = MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext);
673    break;
674  case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
675    // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
676    // with a relocation as gp-relative, e.g.:
677    //     .gprel32 LBB123
678    MCSymbol *MBBSym = MBB->getSymbol(OutContext);
679    OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
680    return;
681  }
682
683  case MachineJumpTableInfo::EK_LabelDifference32: {
684    // EK_LabelDifference32 - Each entry is the address of the block minus
685    // the address of the jump table.  This is used for PIC jump tables where
686    // gprel32 is not supported.  e.g.:
687    //      .word LBB123 - LJTI1_2
688    // If the .set directive is supported, this is emitted as:
689    //      .set L4_5_set_123, LBB123 - LJTI1_2
690    //      .word L4_5_set_123
691
692    // If we have emitted set directives for the jump table entries, print
693    // them rather than the entries themselves.  If we're emitting PIC, then
694    // emit the table entries as differences between two text section labels.
695    if (MAI->hasSetDirective()) {
696      // If we used .set, reference the .set's symbol.
697      Value = MCSymbolRefExpr::Create(GetJTSetSymbol(UID, MBB->getNumber()),
698                                      OutContext);
699      break;
700    }
701    // Otherwise, use the difference as the jump table entry.
702    Value = MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext);
703    const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(UID), OutContext);
704    Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext);
705    break;
706  }
707  }
708
709  assert(Value && "Unknown entry kind!");
710
711  unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData());
712  OutStreamer.EmitValue(Value, EntrySize, /*addrspace*/0);
713}
714
715
716/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
717/// special global used by LLVM.  If so, emit it and return true, otherwise
718/// do nothing and return false.
719bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
720  if (GV->getName() == "llvm.used") {
721    if (MAI->hasNoDeadStrip())    // No need to emit this at all.
722      EmitLLVMUsedList(GV->getInitializer());
723    return true;
724  }
725
726  // Ignore debug and non-emitted data.  This handles llvm.compiler.used.
727  if (GV->getSection() == "llvm.metadata" ||
728      GV->hasAvailableExternallyLinkage())
729    return true;
730
731  if (!GV->hasAppendingLinkage()) return false;
732
733  assert(GV->hasInitializer() && "Not a special LLVM global!");
734
735  const TargetData *TD = TM.getTargetData();
736  unsigned Align = Log2_32(TD->getPointerPrefAlignment());
737  if (GV->getName() == "llvm.global_ctors") {
738    OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
739    EmitAlignment(Align, 0);
740    EmitXXStructorList(GV->getInitializer());
741
742    if (TM.getRelocationModel() == Reloc::Static &&
743        MAI->hasStaticCtorDtorReferenceInStaticMode()) {
744      StringRef Sym(".constructors_used");
745      OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
746                                      MCSA_Reference);
747    }
748    return true;
749  }
750
751  if (GV->getName() == "llvm.global_dtors") {
752    OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
753    EmitAlignment(Align, 0);
754    EmitXXStructorList(GV->getInitializer());
755
756    if (TM.getRelocationModel() == Reloc::Static &&
757        MAI->hasStaticCtorDtorReferenceInStaticMode()) {
758      StringRef Sym(".destructors_used");
759      OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
760                                      MCSA_Reference);
761    }
762    return true;
763  }
764
765  return false;
766}
767
768/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
769/// global in the specified llvm.used list for which emitUsedDirectiveFor
770/// is true, as being used with this directive.
771void AsmPrinter::EmitLLVMUsedList(Constant *List) {
772  // Should be an array of 'i8*'.
773  ConstantArray *InitList = dyn_cast<ConstantArray>(List);
774  if (InitList == 0) return;
775
776  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
777    const GlobalValue *GV =
778      dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
779    if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang))
780      OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(GV),
781                                      MCSA_NoDeadStrip);
782  }
783}
784
785/// EmitXXStructorList - Emit the ctor or dtor list.  This just prints out the
786/// function pointers, ignoring the init priority.
787void AsmPrinter::EmitXXStructorList(Constant *List) {
788  // Should be an array of '{ int, void ()* }' structs.  The first value is the
789  // init priority, which we ignore.
790  if (!isa<ConstantArray>(List)) return;
791  ConstantArray *InitList = cast<ConstantArray>(List);
792  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
793    if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
794      if (CS->getNumOperands() != 2) return;  // Not array of 2-element structs.
795
796      if (CS->getOperand(1)->isNullValue())
797        return;  // Found a null terminator, exit printing.
798      // Emit the function pointer.
799      EmitGlobalConstant(CS->getOperand(1));
800    }
801}
802
803//===--------------------------------------------------------------------===//
804// Emission and print routines
805//
806
807/// EmitInt8 - Emit a byte directive and value.
808///
809void AsmPrinter::EmitInt8(int Value) const {
810  OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/);
811}
812
813/// EmitInt16 - Emit a short directive and value.
814///
815void AsmPrinter::EmitInt16(int Value) const {
816  OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/);
817}
818
819/// EmitInt32 - Emit a long directive and value.
820///
821void AsmPrinter::EmitInt32(int Value) const {
822  OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/);
823}
824
825/// EmitInt64 - Emit a long long directive and value.
826///
827void AsmPrinter::EmitInt64(uint64_t Value) const {
828  OutStreamer.EmitIntValue(Value, 8, 0/*addrspace*/);
829}
830
831//===----------------------------------------------------------------------===//
832
833// EmitAlignment - Emit an alignment directive to the specified power of
834// two boundary.  For example, if you pass in 3 here, you will get an 8
835// byte alignment.  If a global value is specified, and if that global has
836// an explicit alignment requested, it will unconditionally override the
837// alignment request.  However, if ForcedAlignBits is specified, this value
838// has final say: the ultimate alignment will be the max of ForcedAlignBits
839// and the alignment computed with NumBits and the global.
840//
841// The algorithm is:
842//     Align = NumBits;
843//     if (GV && GV->hasalignment) Align = GV->getalignment();
844//     Align = std::max(Align, ForcedAlignBits);
845//
846void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
847                               unsigned ForcedAlignBits,
848                               bool UseFillExpr) const {
849  if (GV && GV->getAlignment())
850    NumBits = Log2_32(GV->getAlignment());
851  NumBits = std::max(NumBits, ForcedAlignBits);
852
853  if (NumBits == 0) return;   // No need to emit alignment.
854
855  unsigned FillValue = 0;
856  if (getCurrentSection()->getKind().isText())
857    FillValue = MAI->getTextAlignFillValue();
858
859  OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0);
860}
861
862/// LowerConstant - Lower the specified LLVM Constant to an MCExpr.
863///
864static const MCExpr *LowerConstant(const Constant *CV, AsmPrinter &AP) {
865  MCContext &Ctx = AP.OutContext;
866
867  if (CV->isNullValue() || isa<UndefValue>(CV))
868    return MCConstantExpr::Create(0, Ctx);
869
870  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
871    return MCConstantExpr::Create(CI->getZExtValue(), Ctx);
872
873  if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
874    return MCSymbolRefExpr::Create(AP.GetGlobalValueSymbol(GV), Ctx);
875  if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
876    return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx);
877
878  const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
879  if (CE == 0) {
880    llvm_unreachable("Unknown constant value to lower!");
881    return MCConstantExpr::Create(0, Ctx);
882  }
883
884  switch (CE->getOpcode()) {
885  case Instruction::ZExt:
886  case Instruction::SExt:
887  case Instruction::FPTrunc:
888  case Instruction::FPExt:
889  case Instruction::UIToFP:
890  case Instruction::SIToFP:
891  case Instruction::FPToUI:
892  case Instruction::FPToSI:
893  default: llvm_unreachable("FIXME: Don't support this constant cast expr");
894  case Instruction::GetElementPtr: {
895    const TargetData &TD = *AP.TM.getTargetData();
896    // Generate a symbolic expression for the byte address
897    const Constant *PtrVal = CE->getOperand(0);
898    SmallVector<Value*, 8> IdxVec(CE->op_begin()+1, CE->op_end());
899    int64_t Offset = TD.getIndexedOffset(PtrVal->getType(), &IdxVec[0],
900                                         IdxVec.size());
901
902    const MCExpr *Base = LowerConstant(CE->getOperand(0), AP);
903    if (Offset == 0)
904      return Base;
905
906    // Truncate/sext the offset to the pointer size.
907    if (TD.getPointerSizeInBits() != 64) {
908      int SExtAmount = 64-TD.getPointerSizeInBits();
909      Offset = (Offset << SExtAmount) >> SExtAmount;
910    }
911
912    return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx),
913                                   Ctx);
914  }
915
916  case Instruction::Trunc:
917    // We emit the value and depend on the assembler to truncate the generated
918    // expression properly.  This is important for differences between
919    // blockaddress labels.  Since the two labels are in the same function, it
920    // is reasonable to treat their delta as a 32-bit value.
921    // FALL THROUGH.
922  case Instruction::BitCast:
923    return LowerConstant(CE->getOperand(0), AP);
924
925  case Instruction::IntToPtr: {
926    const TargetData &TD = *AP.TM.getTargetData();
927    // Handle casts to pointers by changing them into casts to the appropriate
928    // integer type.  This promotes constant folding and simplifies this code.
929    Constant *Op = CE->getOperand(0);
930    Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()),
931                                      false/*ZExt*/);
932    return LowerConstant(Op, AP);
933  }
934
935  case Instruction::PtrToInt: {
936    const TargetData &TD = *AP.TM.getTargetData();
937    // Support only foldable casts to/from pointers that can be eliminated by
938    // changing the pointer to the appropriately sized integer type.
939    Constant *Op = CE->getOperand(0);
940    const Type *Ty = CE->getType();
941
942    const MCExpr *OpExpr = LowerConstant(Op, AP);
943
944    // We can emit the pointer value into this slot if the slot is an
945    // integer slot equal to the size of the pointer.
946    if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType()))
947      return OpExpr;
948
949    // Otherwise the pointer is smaller than the resultant integer, mask off
950    // the high bits so we are sure to get a proper truncation if the input is
951    // a constant expr.
952    unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType());
953    const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx);
954    return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx);
955  }
956
957  case Instruction::Add:
958  case Instruction::Sub:
959  case Instruction::And:
960  case Instruction::Or:
961  case Instruction::Xor: {
962    const MCExpr *LHS = LowerConstant(CE->getOperand(0), AP);
963    const MCExpr *RHS = LowerConstant(CE->getOperand(1), AP);
964    switch (CE->getOpcode()) {
965    default: llvm_unreachable("Unknown binary operator constant cast expr");
966    case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx);
967    case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx);
968    case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx);
969    case Instruction::Or:  return MCBinaryExpr::CreateOr (LHS, RHS, Ctx);
970    case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx);
971    }
972  }
973  }
974}
975
976static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace,
977                                    AsmPrinter &AP) {
978  if (AddrSpace != 0 || !CA->isString()) {
979    // Not a string.  Print the values in successive locations
980    for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
981      AP.EmitGlobalConstant(CA->getOperand(i), AddrSpace);
982    return;
983  }
984
985  // Otherwise, it can be emitted as .ascii.
986  SmallVector<char, 128> TmpVec;
987  TmpVec.reserve(CA->getNumOperands());
988  for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
989    TmpVec.push_back(cast<ConstantInt>(CA->getOperand(i))->getZExtValue());
990
991  AP.OutStreamer.EmitBytes(StringRef(TmpVec.data(), TmpVec.size()), AddrSpace);
992}
993
994static void EmitGlobalConstantVector(const ConstantVector *CV,
995                                     unsigned AddrSpace, AsmPrinter &AP) {
996  for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
997    AP.EmitGlobalConstant(CV->getOperand(i), AddrSpace);
998}
999
1000static void EmitGlobalConstantStruct(const ConstantStruct *CS,
1001                                     unsigned AddrSpace, AsmPrinter &AP) {
1002  // Print the fields in successive locations. Pad to align if needed!
1003  const TargetData *TD = AP.TM.getTargetData();
1004  unsigned Size = TD->getTypeAllocSize(CS->getType());
1005  const StructLayout *Layout = TD->getStructLayout(CS->getType());
1006  uint64_t SizeSoFar = 0;
1007  for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
1008    const Constant *Field = CS->getOperand(i);
1009
1010    // Check if padding is needed and insert one or more 0s.
1011    uint64_t FieldSize = TD->getTypeAllocSize(Field->getType());
1012    uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
1013                        - Layout->getElementOffset(i)) - FieldSize;
1014    SizeSoFar += FieldSize + PadSize;
1015
1016    // Now print the actual field value.
1017    AP.EmitGlobalConstant(Field, AddrSpace);
1018
1019    // Insert padding - this may include padding to increase the size of the
1020    // current field up to the ABI size (if the struct is not packed) as well
1021    // as padding to ensure that the next field starts at the right offset.
1022    AP.OutStreamer.EmitZeros(PadSize, AddrSpace);
1023  }
1024  assert(SizeSoFar == Layout->getSizeInBytes() &&
1025         "Layout of constant struct may be incorrect!");
1026}
1027
1028static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace,
1029                                 AsmPrinter &AP) {
1030  // FP Constants are printed as integer constants to avoid losing
1031  // precision.
1032  if (CFP->getType()->isDoubleTy()) {
1033    if (AP.VerboseAsm) {
1034      double Val = CFP->getValueAPF().convertToDouble();
1035      AP.OutStreamer.GetCommentOS() << "double " << Val << '\n';
1036    }
1037
1038    uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1039    AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1040    return;
1041  }
1042
1043  if (CFP->getType()->isFloatTy()) {
1044    if (AP.VerboseAsm) {
1045      float Val = CFP->getValueAPF().convertToFloat();
1046      AP.OutStreamer.GetCommentOS() << "float " << Val << '\n';
1047    }
1048    uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1049    AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace);
1050    return;
1051  }
1052
1053  if (CFP->getType()->isX86_FP80Ty()) {
1054    // all long double variants are printed as hex
1055    // api needed to prevent premature destruction
1056    APInt API = CFP->getValueAPF().bitcastToAPInt();
1057    const uint64_t *p = API.getRawData();
1058    if (AP.VerboseAsm) {
1059      // Convert to double so we can print the approximate val as a comment.
1060      APFloat DoubleVal = CFP->getValueAPF();
1061      bool ignored;
1062      DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1063                        &ignored);
1064      AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= "
1065        << DoubleVal.convertToDouble() << '\n';
1066    }
1067
1068    if (AP.TM.getTargetData()->isBigEndian()) {
1069      AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1070      AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1071    } else {
1072      AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1073      AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1074    }
1075
1076    // Emit the tail padding for the long double.
1077    const TargetData &TD = *AP.TM.getTargetData();
1078    AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) -
1079                             TD.getTypeStoreSize(CFP->getType()), AddrSpace);
1080    return;
1081  }
1082
1083  assert(CFP->getType()->isPPC_FP128Ty() &&
1084         "Floating point constant type not handled");
1085  // All long double variants are printed as hex api needed to prevent
1086  // premature destruction.
1087  APInt API = CFP->getValueAPF().bitcastToAPInt();
1088  const uint64_t *p = API.getRawData();
1089  if (AP.TM.getTargetData()->isBigEndian()) {
1090    AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1091    AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1092  } else {
1093    AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1094    AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1095  }
1096}
1097
1098static void EmitGlobalConstantLargeInt(const ConstantInt *CI,
1099                                       unsigned AddrSpace, AsmPrinter &AP) {
1100  const TargetData *TD = AP.TM.getTargetData();
1101  unsigned BitWidth = CI->getBitWidth();
1102  assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
1103
1104  // We don't expect assemblers to support integer data directives
1105  // for more than 64 bits, so we emit the data in at most 64-bit
1106  // quantities at a time.
1107  const uint64_t *RawData = CI->getValue().getRawData();
1108  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1109    uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i];
1110    AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1111  }
1112}
1113
1114/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1115void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1116  if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) {
1117    uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1118    return OutStreamer.EmitZeros(Size, AddrSpace);
1119  }
1120
1121  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1122    unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1123    switch (Size) {
1124    case 1:
1125    case 2:
1126    case 4:
1127    case 8:
1128      if (VerboseAsm)
1129        OutStreamer.GetCommentOS() << format("0x%llx\n", CI->getZExtValue());
1130      OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace);
1131      return;
1132    default:
1133      EmitGlobalConstantLargeInt(CI, AddrSpace, *this);
1134      return;
1135    }
1136  }
1137
1138  if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
1139    return EmitGlobalConstantArray(CVA, AddrSpace, *this);
1140
1141  if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
1142    return EmitGlobalConstantStruct(CVS, AddrSpace, *this);
1143
1144  if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
1145    return EmitGlobalConstantFP(CFP, AddrSpace, *this);
1146
1147  if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
1148    return EmitGlobalConstantVector(V, AddrSpace, *this);
1149
1150  if (isa<ConstantPointerNull>(CV)) {
1151    unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1152    OutStreamer.EmitIntValue(0, Size, AddrSpace);
1153    return;
1154  }
1155
1156  // Otherwise, it must be a ConstantExpr.  Lower it to an MCExpr, then emit it
1157  // thread the streamer with EmitValue.
1158  OutStreamer.EmitValue(LowerConstant(CV, *this),
1159                        TM.getTargetData()->getTypeAllocSize(CV->getType()),
1160                        AddrSpace);
1161}
1162
1163void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1164  // Target doesn't support this yet!
1165  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1166}
1167
1168/// PrintSpecial - Print information related to the specified machine instr
1169/// that is independent of the operand, and may be independent of the instr
1170/// itself.  This can be useful for portably encoding the comment character
1171/// or other bits of target-specific knowledge into the asmstrings.  The
1172/// syntax used is ${:comment}.  Targets can override this to add support
1173/// for their own strange codes.
1174void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1175  if (!strcmp(Code, "private")) {
1176    O << MAI->getPrivateGlobalPrefix();
1177  } else if (!strcmp(Code, "comment")) {
1178    if (VerboseAsm)
1179      O << MAI->getCommentString();
1180  } else if (!strcmp(Code, "uid")) {
1181    // Comparing the address of MI isn't sufficient, because machineinstrs may
1182    // be allocated to the same address across functions.
1183    const Function *ThisF = MI->getParent()->getParent()->getFunction();
1184
1185    // If this is a new LastFn instruction, bump the counter.
1186    if (LastMI != MI || LastFn != ThisF) {
1187      ++Counter;
1188      LastMI = MI;
1189      LastFn = ThisF;
1190    }
1191    O << Counter;
1192  } else {
1193    std::string msg;
1194    raw_string_ostream Msg(msg);
1195    Msg << "Unknown special formatter '" << Code
1196         << "' for machine instr: " << *MI;
1197    llvm_report_error(Msg.str());
1198  }
1199}
1200
1201/// processDebugLoc - Processes the debug information of each machine
1202/// instruction's DebugLoc.
1203void AsmPrinter::processDebugLoc(const MachineInstr *MI,
1204                                 bool BeforePrintingInsn) {
1205  if (!MAI || !DW || !MAI->doesSupportDebugInformation()
1206      || !DW->ShouldEmitDwarfDebug())
1207    return;
1208  DebugLoc DL = MI->getDebugLoc();
1209  if (DL.isUnknown())
1210    return;
1211  DILocation CurDLT = MF->getDILocation(DL);
1212  if (CurDLT.getScope().isNull())
1213    return;
1214
1215  if (!BeforePrintingInsn) {
1216    // After printing instruction
1217    DW->EndScope(MI);
1218  } else if (CurDLT.getNode() != PrevDLT) {
1219    unsigned L = DW->RecordSourceLine(CurDLT.getLineNumber(),
1220                                      CurDLT.getColumnNumber(),
1221                                      CurDLT.getScope().getNode());
1222    printLabel(L);
1223    O << '\n';
1224    DW->BeginScope(MI, L);
1225    PrevDLT = CurDLT.getNode();
1226  }
1227}
1228
1229
1230/// printInlineAsm - This method formats and prints the specified machine
1231/// instruction that is an inline asm.
1232void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1233  unsigned NumOperands = MI->getNumOperands();
1234
1235  // Count the number of register definitions.
1236  unsigned NumDefs = 0;
1237  for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1238       ++NumDefs)
1239    assert(NumDefs != NumOperands-1 && "No asm string?");
1240
1241  assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1242
1243  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1244  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1245
1246  O << '\t';
1247
1248  // If this asmstr is empty, just print the #APP/#NOAPP markers.
1249  // These are useful to see where empty asm's wound up.
1250  if (AsmStr[0] == 0) {
1251    O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1252    O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
1253    return;
1254  }
1255
1256  O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1257
1258  // The variant of the current asmprinter.
1259  int AsmPrinterVariant = MAI->getAssemblerDialect();
1260
1261  int CurVariant = -1;            // The number of the {.|.|.} region we are in.
1262  const char *LastEmitted = AsmStr; // One past the last character emitted.
1263
1264  while (*LastEmitted) {
1265    switch (*LastEmitted) {
1266    default: {
1267      // Not a special case, emit the string section literally.
1268      const char *LiteralEnd = LastEmitted+1;
1269      while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1270             *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1271        ++LiteralEnd;
1272      if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1273        O.write(LastEmitted, LiteralEnd-LastEmitted);
1274      LastEmitted = LiteralEnd;
1275      break;
1276    }
1277    case '\n':
1278      ++LastEmitted;   // Consume newline character.
1279      O << '\n';       // Indent code with newline.
1280      break;
1281    case '$': {
1282      ++LastEmitted;   // Consume '$' character.
1283      bool Done = true;
1284
1285      // Handle escapes.
1286      switch (*LastEmitted) {
1287      default: Done = false; break;
1288      case '$':     // $$ -> $
1289        if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1290          O << '$';
1291        ++LastEmitted;  // Consume second '$' character.
1292        break;
1293      case '(':             // $( -> same as GCC's { character.
1294        ++LastEmitted;      // Consume '(' character.
1295        if (CurVariant != -1) {
1296          llvm_report_error("Nested variants found in inline asm string: '"
1297                            + std::string(AsmStr) + "'");
1298        }
1299        CurVariant = 0;     // We're in the first variant now.
1300        break;
1301      case '|':
1302        ++LastEmitted;  // consume '|' character.
1303        if (CurVariant == -1)
1304          O << '|';       // this is gcc's behavior for | outside a variant
1305        else
1306          ++CurVariant;   // We're in the next variant.
1307        break;
1308      case ')':         // $) -> same as GCC's } char.
1309        ++LastEmitted;  // consume ')' character.
1310        if (CurVariant == -1)
1311          O << '}';     // this is gcc's behavior for } outside a variant
1312        else
1313          CurVariant = -1;
1314        break;
1315      }
1316      if (Done) break;
1317
1318      bool HasCurlyBraces = false;
1319      if (*LastEmitted == '{') {     // ${variable}
1320        ++LastEmitted;               // Consume '{' character.
1321        HasCurlyBraces = true;
1322      }
1323
1324      // If we have ${:foo}, then this is not a real operand reference, it is a
1325      // "magic" string reference, just like in .td files.  Arrange to call
1326      // PrintSpecial.
1327      if (HasCurlyBraces && *LastEmitted == ':') {
1328        ++LastEmitted;
1329        const char *StrStart = LastEmitted;
1330        const char *StrEnd = strchr(StrStart, '}');
1331        if (StrEnd == 0) {
1332          llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1333                            + std::string(AsmStr) + "'");
1334        }
1335
1336        std::string Val(StrStart, StrEnd);
1337        PrintSpecial(MI, Val.c_str());
1338        LastEmitted = StrEnd+1;
1339        break;
1340      }
1341
1342      const char *IDStart = LastEmitted;
1343      char *IDEnd;
1344      errno = 0;
1345      long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1346      if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1347        llvm_report_error("Bad $ operand number in inline asm string: '"
1348                          + std::string(AsmStr) + "'");
1349      }
1350      LastEmitted = IDEnd;
1351
1352      char Modifier[2] = { 0, 0 };
1353
1354      if (HasCurlyBraces) {
1355        // If we have curly braces, check for a modifier character.  This
1356        // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1357        if (*LastEmitted == ':') {
1358          ++LastEmitted;    // Consume ':' character.
1359          if (*LastEmitted == 0) {
1360            llvm_report_error("Bad ${:} expression in inline asm string: '"
1361                              + std::string(AsmStr) + "'");
1362          }
1363
1364          Modifier[0] = *LastEmitted;
1365          ++LastEmitted;    // Consume modifier character.
1366        }
1367
1368        if (*LastEmitted != '}') {
1369          llvm_report_error("Bad ${} expression in inline asm string: '"
1370                            + std::string(AsmStr) + "'");
1371        }
1372        ++LastEmitted;    // Consume '}' character.
1373      }
1374
1375      if ((unsigned)Val >= NumOperands-1) {
1376        llvm_report_error("Invalid $ operand number in inline asm string: '"
1377                          + std::string(AsmStr) + "'");
1378      }
1379
1380      // Okay, we finally have a value number.  Ask the target to print this
1381      // operand!
1382      if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1383        unsigned OpNo = 1;
1384
1385        bool Error = false;
1386
1387        // Scan to find the machine operand number for the operand.
1388        for (; Val; --Val) {
1389          if (OpNo >= MI->getNumOperands()) break;
1390          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1391          OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1392        }
1393
1394        if (OpNo >= MI->getNumOperands()) {
1395          Error = true;
1396        } else {
1397          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1398          ++OpNo;  // Skip over the ID number.
1399
1400          if (Modifier[0] == 'l')  // labels are target independent
1401            O << *MI->getOperand(OpNo).getMBB()->getSymbol(OutContext);
1402          else {
1403            AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1404            if ((OpFlags & 7) == 4) {
1405              Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1406                                                Modifier[0] ? Modifier : 0);
1407            } else {
1408              Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1409                                          Modifier[0] ? Modifier : 0);
1410            }
1411          }
1412        }
1413        if (Error) {
1414          std::string msg;
1415          raw_string_ostream Msg(msg);
1416          Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n";
1417          MI->print(Msg);
1418          llvm_report_error(Msg.str());
1419        }
1420      }
1421      break;
1422    }
1423    }
1424  }
1425  O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd();
1426}
1427
1428/// printImplicitDef - This method prints the specified machine instruction
1429/// that is an implicit def.
1430void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1431  if (!VerboseAsm) return;
1432  O.PadToColumn(MAI->getCommentColumn());
1433  O << MAI->getCommentString() << " implicit-def: "
1434    << TRI->getName(MI->getOperand(0).getReg());
1435}
1436
1437void AsmPrinter::printKill(const MachineInstr *MI) const {
1438  if (!VerboseAsm) return;
1439  O.PadToColumn(MAI->getCommentColumn());
1440  O << MAI->getCommentString() << " kill:";
1441  for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) {
1442    const MachineOperand &op = MI->getOperand(n);
1443    assert(op.isReg() && "KILL instruction must have only register operands");
1444    O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>");
1445  }
1446}
1447
1448/// printLabel - This method prints a local label used by debug and
1449/// exception handling tables.
1450void AsmPrinter::printLabel(const MachineInstr *MI) const {
1451  printLabel(MI->getOperand(0).getImm());
1452}
1453
1454void AsmPrinter::printLabel(unsigned Id) const {
1455  O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':';
1456}
1457
1458/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1459/// instruction, using the specified assembler variant.  Targets should
1460/// override this to format as appropriate.
1461bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1462                                 unsigned AsmVariant, const char *ExtraCode) {
1463  // Target doesn't support this yet!
1464  return true;
1465}
1466
1467bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1468                                       unsigned AsmVariant,
1469                                       const char *ExtraCode) {
1470  // Target doesn't support this yet!
1471  return true;
1472}
1473
1474MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA,
1475                                            const char *Suffix) const {
1476  return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock(), Suffix);
1477}
1478
1479MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F,
1480                                            const BasicBlock *BB,
1481                                            const char *Suffix) const {
1482  assert(BB->hasName() &&
1483         "Address of anonymous basic block not supported yet!");
1484
1485  // This code must use the function name itself, and not the function number,
1486  // since it must be possible to generate the label name from within other
1487  // functions.
1488  SmallString<60> FnName;
1489  Mang->getNameWithPrefix(FnName, F, false);
1490
1491  // FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME!
1492  SmallString<60> NameResult;
1493  Mang->getNameWithPrefix(NameResult,
1494                          StringRef("BA") + Twine((unsigned)FnName.size()) +
1495                          "_" + FnName.str() + "_" + BB->getName() + Suffix,
1496                          Mangler::Private);
1497
1498  return OutContext.GetOrCreateSymbol(NameResult.str());
1499}
1500
1501/// GetCPISymbol - Return the symbol for the specified constant pool entry.
1502MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
1503  SmallString<60> Name;
1504  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI"
1505    << getFunctionNumber() << '_' << CPID;
1506  return OutContext.GetOrCreateSymbol(Name.str());
1507}
1508
1509/// GetJTISymbol - Return the symbol for the specified jump table entry.
1510MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
1511  return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
1512}
1513
1514/// GetJTSetSymbol - Return the symbol for the specified jump table .set
1515/// FIXME: privatize to AsmPrinter.
1516MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
1517  SmallString<60> Name;
1518  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix()
1519    << getFunctionNumber() << '_' << UID << "_set_" << MBBID;
1520  return OutContext.GetOrCreateSymbol(Name.str());
1521}
1522
1523/// GetGlobalValueSymbol - Return the MCSymbol for the specified global
1524/// value.
1525MCSymbol *AsmPrinter::GetGlobalValueSymbol(const GlobalValue *GV) const {
1526  SmallString<60> NameStr;
1527  Mang->getNameWithPrefix(NameStr, GV, false);
1528  return OutContext.GetOrCreateSymbol(NameStr.str());
1529}
1530
1531/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
1532/// global value name as its base, with the specified suffix, and where the
1533/// symbol is forced to have private linkage if ForcePrivate is true.
1534MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
1535                                                   StringRef Suffix,
1536                                                   bool ForcePrivate) const {
1537  SmallString<60> NameStr;
1538  Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
1539  NameStr.append(Suffix.begin(), Suffix.end());
1540  return OutContext.GetOrCreateSymbol(NameStr.str());
1541}
1542
1543/// GetExternalSymbolSymbol - Return the MCSymbol for the specified
1544/// ExternalSymbol.
1545MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
1546  SmallString<60> NameStr;
1547  Mang->getNameWithPrefix(NameStr, Sym);
1548  return OutContext.GetOrCreateSymbol(NameStr.str());
1549}
1550
1551
1552
1553/// PrintParentLoopComment - Print comments about parent loops of this one.
1554static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1555                                   unsigned FunctionNumber) {
1556  if (Loop == 0) return;
1557  PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
1558  OS.indent(Loop->getLoopDepth()*2)
1559    << "Parent Loop BB" << FunctionNumber << "_"
1560    << Loop->getHeader()->getNumber()
1561    << " Depth=" << Loop->getLoopDepth() << '\n';
1562}
1563
1564
1565/// PrintChildLoopComment - Print comments about child loops within
1566/// the loop for this basic block, with nesting.
1567static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1568                                  unsigned FunctionNumber) {
1569  // Add child loop information
1570  for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
1571    OS.indent((*CL)->getLoopDepth()*2)
1572      << "Child Loop BB" << FunctionNumber << "_"
1573      << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
1574      << '\n';
1575    PrintChildLoopComment(OS, *CL, FunctionNumber);
1576  }
1577}
1578
1579/// EmitComments - Pretty-print comments for basic blocks.
1580static void PrintBasicBlockLoopComments(const MachineBasicBlock &MBB,
1581                                        const MachineLoopInfo *LI,
1582                                        const AsmPrinter &AP) {
1583  // Add loop depth information
1584  const MachineLoop *Loop = LI->getLoopFor(&MBB);
1585  if (Loop == 0) return;
1586
1587  MachineBasicBlock *Header = Loop->getHeader();
1588  assert(Header && "No header for loop");
1589
1590  // If this block is not a loop header, just print out what is the loop header
1591  // and return.
1592  if (Header != &MBB) {
1593    AP.OutStreamer.AddComment("  in Loop: Header=BB" +
1594                              Twine(AP.getFunctionNumber())+"_" +
1595                              Twine(Loop->getHeader()->getNumber())+
1596                              " Depth="+Twine(Loop->getLoopDepth()));
1597    return;
1598  }
1599
1600  // Otherwise, it is a loop header.  Print out information about child and
1601  // parent loops.
1602  raw_ostream &OS = AP.OutStreamer.GetCommentOS();
1603
1604  PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
1605
1606  OS << "=>";
1607  OS.indent(Loop->getLoopDepth()*2-2);
1608
1609  OS << "This ";
1610  if (Loop->empty())
1611    OS << "Inner ";
1612  OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
1613
1614  PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
1615}
1616
1617
1618/// EmitBasicBlockStart - This method prints the label for the specified
1619/// MachineBasicBlock, an alignment (if present) and a comment describing
1620/// it if appropriate.
1621void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
1622  // Emit an alignment directive for this block, if needed.
1623  if (unsigned Align = MBB->getAlignment())
1624    EmitAlignment(Log2_32(Align));
1625
1626  // If the block has its address taken, emit a special label to satisfy
1627  // references to the block. This is done so that we don't need to
1628  // remember the number of this label, and so that we can make
1629  // forward references to labels without knowing what their numbers
1630  // will be.
1631  if (MBB->hasAddressTaken()) {
1632    const BasicBlock *BB = MBB->getBasicBlock();
1633    if (VerboseAsm)
1634      OutStreamer.AddComment("Address Taken");
1635    OutStreamer.EmitLabel(GetBlockAddressSymbol(BB->getParent(), BB));
1636  }
1637
1638  // Print the main label for the block.
1639  if (MBB->pred_empty() || MBB->isOnlyReachableByFallthrough()) {
1640    if (VerboseAsm) {
1641      // NOTE: Want this comment at start of line.
1642      O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':';
1643      if (const BasicBlock *BB = MBB->getBasicBlock())
1644        if (BB->hasName())
1645          OutStreamer.AddComment("%" + BB->getName());
1646
1647      PrintBasicBlockLoopComments(*MBB, LI, *this);
1648      OutStreamer.AddBlankLine();
1649    }
1650  } else {
1651    if (VerboseAsm) {
1652      if (const BasicBlock *BB = MBB->getBasicBlock())
1653        if (BB->hasName())
1654          OutStreamer.AddComment("%" + BB->getName());
1655      PrintBasicBlockLoopComments(*MBB, LI, *this);
1656    }
1657
1658    OutStreamer.EmitLabel(MBB->getSymbol(OutContext));
1659  }
1660}
1661
1662void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility) const {
1663  MCSymbolAttr Attr = MCSA_Invalid;
1664
1665  switch (Visibility) {
1666  default: break;
1667  case GlobalValue::HiddenVisibility:
1668    Attr = MAI->getHiddenVisibilityAttr();
1669    break;
1670  case GlobalValue::ProtectedVisibility:
1671    Attr = MAI->getProtectedVisibilityAttr();
1672    break;
1673  }
1674
1675  if (Attr != MCSA_Invalid)
1676    OutStreamer.EmitSymbolAttribute(Sym, Attr);
1677}
1678
1679void AsmPrinter::printOffset(int64_t Offset) const {
1680  if (Offset > 0)
1681    O << '+' << Offset;
1682  else if (Offset < 0)
1683    O << Offset;
1684}
1685
1686GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1687  if (!S->usesMetadata())
1688    return 0;
1689
1690  gcp_iterator GCPI = GCMetadataPrinters.find(S);
1691  if (GCPI != GCMetadataPrinters.end())
1692    return GCPI->second;
1693
1694  const char *Name = S->getName().c_str();
1695
1696  for (GCMetadataPrinterRegistry::iterator
1697         I = GCMetadataPrinterRegistry::begin(),
1698         E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1699    if (strcmp(Name, I->getName()) == 0) {
1700      GCMetadataPrinter *GMP = I->instantiate();
1701      GMP->S = S;
1702      GCMetadataPrinters.insert(std::make_pair(S, GMP));
1703      return GMP;
1704    }
1705
1706  llvm_report_error("no GCMetadataPrinter registered for GC: " + Twine(Name));
1707  return 0;
1708}
1709
1710/// EmitComments - Pretty-print comments for instructions
1711void AsmPrinter::EmitComments(const MachineInstr &MI) const {
1712  if (!VerboseAsm)
1713    return;
1714
1715  bool Newline = false;
1716
1717  if (!MI.getDebugLoc().isUnknown()) {
1718    DILocation DLT = MF->getDILocation(MI.getDebugLoc());
1719
1720    // Print source line info.
1721    O.PadToColumn(MAI->getCommentColumn());
1722    O << MAI->getCommentString() << ' ';
1723    DIScope Scope = DLT.getScope();
1724    // Omit the directory, because it's likely to be long and uninteresting.
1725    if (!Scope.isNull())
1726      O << Scope.getFilename();
1727    else
1728      O << "<unknown>";
1729    O << ':' << DLT.getLineNumber();
1730    if (DLT.getColumnNumber() != 0)
1731      O << ':' << DLT.getColumnNumber();
1732    Newline = true;
1733  }
1734
1735  // Check for spills and reloads
1736  int FI;
1737
1738  const MachineFrameInfo *FrameInfo =
1739    MI.getParent()->getParent()->getFrameInfo();
1740
1741  // We assume a single instruction only has a spill or reload, not
1742  // both.
1743  const MachineMemOperand *MMO;
1744  if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
1745    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1746      MMO = *MI.memoperands_begin();
1747      if (Newline) O << '\n';
1748      O.PadToColumn(MAI->getCommentColumn());
1749      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Reload";
1750      Newline = true;
1751    }
1752  }
1753  else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
1754    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1755      if (Newline) O << '\n';
1756      O.PadToColumn(MAI->getCommentColumn());
1757      O << MAI->getCommentString() << ' '
1758        << MMO->getSize() << "-byte Folded Reload";
1759      Newline = true;
1760    }
1761  }
1762  else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
1763    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1764      MMO = *MI.memoperands_begin();
1765      if (Newline) O << '\n';
1766      O.PadToColumn(MAI->getCommentColumn());
1767      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Spill";
1768      Newline = true;
1769    }
1770  }
1771  else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
1772    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1773      if (Newline) O << '\n';
1774      O.PadToColumn(MAI->getCommentColumn());
1775      O << MAI->getCommentString() << ' '
1776        << MMO->getSize() << "-byte Folded Spill";
1777      Newline = true;
1778    }
1779  }
1780
1781  // Check for spill-induced copies
1782  unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
1783  if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg,
1784                                      SrcSubIdx, DstSubIdx)) {
1785    if (MI.getAsmPrinterFlag(ReloadReuse)) {
1786      if (Newline) O << '\n';
1787      O.PadToColumn(MAI->getCommentColumn());
1788      O << MAI->getCommentString() << " Reload Reuse";
1789    }
1790  }
1791}
1792
1793