AsmPrinter.cpp revision 8559cf724e8fb6a74ee227709b3a634edb2f46b4 
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/MCExpr.h"
30#include "llvm/MC/MCInst.h"
31#include "llvm/MC/MCSection.h"
32#include "llvm/MC/MCStreamer.h"
33#include "llvm/MC/MCSymbol.h"
34#include "llvm/Support/CommandLine.h"
35#include "llvm/Support/ErrorHandling.h"
36#include "llvm/Support/Format.h"
37#include "llvm/Support/FormattedStream.h"
38#include "llvm/MC/MCAsmInfo.h"
39#include "llvm/Target/Mangler.h"
40#include "llvm/Target/TargetData.h"
41#include "llvm/Target/TargetInstrInfo.h"
42#include "llvm/Target/TargetLowering.h"
43#include "llvm/Target/TargetLoweringObjectFile.h"
44#include "llvm/Target/TargetOptions.h"
45#include "llvm/Target/TargetRegisterInfo.h"
46#include "llvm/ADT/SmallPtrSet.h"
47#include "llvm/ADT/SmallString.h"
48#include <cerrno>
49using namespace llvm;
50
51static cl::opt<cl::boolOrDefault>
52AsmVerbose("asm-verbose", cl::desc("Add comments to directives."),
53           cl::init(cl::BOU_UNSET));
54
55static bool getVerboseAsm(bool VDef) {
56  switch (AsmVerbose) {
57  default:
58  case cl::BOU_UNSET: return VDef;
59  case cl::BOU_TRUE:  return true;
60  case cl::BOU_FALSE: return false;
61  }
62}
63
64char AsmPrinter::ID = 0;
65AsmPrinter::AsmPrinter(formatted_raw_ostream &o, TargetMachine &tm,
66                       const MCAsmInfo *T, bool VDef)
67  : MachineFunctionPass(&ID), O(o),
68    TM(tm), MAI(T), TRI(tm.getRegisterInfo()),
69
70    OutContext(*new MCContext()),
71    // FIXME: Pass instprinter to streamer.
72    OutStreamer(*createAsmStreamer(OutContext, O, *T,
73                                   TM.getTargetData()->isLittleEndian(),
74                                   getVerboseAsm(VDef), 0)),
75
76    LastMI(0), LastFn(0), Counter(~0U), PrevDLT(NULL) {
77  DW = 0; MMI = 0;
78  VerboseAsm = getVerboseAsm(VDef);
79}
80
81AsmPrinter::~AsmPrinter() {
82  for (gcp_iterator I = GCMetadataPrinters.begin(),
83                    E = GCMetadataPrinters.end(); I != E; ++I)
84    delete I->second;
85
86  delete &OutStreamer;
87  delete &OutContext;
88}
89
90/// getFunctionNumber - Return a unique ID for the current function.
91///
92unsigned AsmPrinter::getFunctionNumber() const {
93  return MF->getFunctionNumber();
94}
95
96TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
97  return TM.getTargetLowering()->getObjFileLowering();
98}
99
100/// getCurrentSection() - Return the current section we are emitting to.
101const MCSection *AsmPrinter::getCurrentSection() const {
102  return OutStreamer.getCurrentSection();
103}
104
105
106void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
107  AU.setPreservesAll();
108  MachineFunctionPass::getAnalysisUsage(AU);
109  AU.addRequired<GCModuleInfo>();
110  if (VerboseAsm)
111    AU.addRequired<MachineLoopInfo>();
112}
113
114bool AsmPrinter::doInitialization(Module &M) {
115  // Initialize TargetLoweringObjectFile.
116  const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
117    .Initialize(OutContext, TM);
118
119  Mang = new Mangler(*MAI);
120
121  // Allow the target to emit any magic that it wants at the start of the file.
122  EmitStartOfAsmFile(M);
123
124  // Very minimal debug info. It is ignored if we emit actual debug info. If we
125  // don't, this at least helps the user find where a global came from.
126  if (MAI->hasSingleParameterDotFile()) {
127    // .file "foo.c"
128    OutStreamer.EmitFileDirective(M.getModuleIdentifier());
129  }
130
131  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
132  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
133  for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
134    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
135      MP->beginAssembly(O, *this, *MAI);
136
137  if (!M.getModuleInlineAsm().empty())
138    O << MAI->getCommentString() << " Start of file scope inline assembly\n"
139      << M.getModuleInlineAsm()
140      << '\n' << MAI->getCommentString()
141      << " End of file scope inline assembly\n";
142
143  MMI = getAnalysisIfAvailable<MachineModuleInfo>();
144  if (MMI)
145    MMI->AnalyzeModule(M);
146  DW = getAnalysisIfAvailable<DwarfWriter>();
147  if (DW)
148    DW->BeginModule(&M, MMI, O, this, MAI);
149
150  return false;
151}
152
153void AsmPrinter::EmitLinkage(unsigned Linkage, MCSymbol *GVSym) const {
154  switch ((GlobalValue::LinkageTypes)Linkage) {
155  case GlobalValue::CommonLinkage:
156  case GlobalValue::LinkOnceAnyLinkage:
157  case GlobalValue::LinkOnceODRLinkage:
158  case GlobalValue::WeakAnyLinkage:
159  case GlobalValue::WeakODRLinkage:
160  case GlobalValue::LinkerPrivateLinkage:
161    if (MAI->getWeakDefDirective() != 0) {
162      // .globl _foo
163      OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
164      // .weak_definition _foo
165      OutStreamer.EmitSymbolAttribute(GVSym, MCSA_WeakDefinition);
166    } else if (const char *LinkOnce = MAI->getLinkOnceDirective()) {
167      // .globl _foo
168      OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
169      // FIXME: linkonce should be a section attribute, handled by COFF Section
170      // assignment.
171      // http://sourceware.org/binutils/docs-2.20/as/Linkonce.html#Linkonce
172      // .linkonce discard
173      // FIXME: It would be nice to use .linkonce samesize for non-common
174      // globals.
175      O << LinkOnce;
176    } else {
177      // .weak _foo
178      OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Weak);
179    }
180    break;
181  case GlobalValue::DLLExportLinkage:
182  case GlobalValue::AppendingLinkage:
183    // FIXME: appending linkage variables should go into a section of
184    // their name or something.  For now, just emit them as external.
185  case GlobalValue::ExternalLinkage:
186    // If external or appending, declare as a global symbol.
187    // .globl _foo
188    OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
189    break;
190  case GlobalValue::PrivateLinkage:
191  case GlobalValue::InternalLinkage:
192    break;
193  default:
194    llvm_unreachable("Unknown linkage type!");
195  }
196}
197
198
199/// EmitGlobalVariable - Emit the specified global variable to the .s file.
200void AsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
201  if (!GV->hasInitializer())   // External globals require no code.
202    return;
203
204  // Check to see if this is a special global used by LLVM, if so, emit it.
205  if (EmitSpecialLLVMGlobal(GV))
206    return;
207
208  MCSymbol *GVSym = GetGlobalValueSymbol(GV);
209  EmitVisibility(GVSym, GV->getVisibility());
210
211  if (MAI->hasDotTypeDotSizeDirective())
212    OutStreamer.EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject);
213
214  SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM);
215
216  const TargetData *TD = TM.getTargetData();
217  unsigned Size = TD->getTypeAllocSize(GV->getType()->getElementType());
218  unsigned AlignLog = TD->getPreferredAlignmentLog(GV);
219
220  // Handle common and BSS local symbols (.lcomm).
221  if (GVKind.isCommon() || GVKind.isBSSLocal()) {
222    if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
223
224    if (VerboseAsm) {
225      WriteAsOperand(OutStreamer.GetCommentOS(), GV,
226                     /*PrintType=*/false, GV->getParent());
227      OutStreamer.GetCommentOS() << '\n';
228    }
229
230    // Handle common symbols.
231    if (GVKind.isCommon()) {
232      // .comm _foo, 42, 4
233      OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
234      return;
235    }
236
237    // Handle local BSS symbols.
238    if (MAI->hasMachoZeroFillDirective()) {
239      const MCSection *TheSection =
240        getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
241      // .zerofill __DATA, __bss, _foo, 400, 5
242      OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
243      return;
244    }
245
246    if (MAI->hasLCOMMDirective()) {
247      // .lcomm _foo, 42
248      OutStreamer.EmitLocalCommonSymbol(GVSym, Size);
249      return;
250    }
251
252    // .local _foo
253    OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Local);
254    // .comm _foo, 42, 4
255    OutStreamer.EmitCommonSymbol(GVSym, Size, 1 << AlignLog);
256    return;
257  }
258
259  const MCSection *TheSection =
260    getObjFileLowering().SectionForGlobal(GV, GVKind, Mang, TM);
261
262  // Handle the zerofill directive on darwin, which is a special form of BSS
263  // emission.
264  if (GVKind.isBSSExtern() && MAI->hasMachoZeroFillDirective()) {
265    // .globl _foo
266    OutStreamer.EmitSymbolAttribute(GVSym, MCSA_Global);
267    // .zerofill __DATA, __common, _foo, 400, 5
268    OutStreamer.EmitZerofill(TheSection, GVSym, Size, 1 << AlignLog);
269    return;
270  }
271
272  OutStreamer.SwitchSection(TheSection);
273
274  EmitLinkage(GV->getLinkage(), GVSym);
275  EmitAlignment(AlignLog, GV);
276
277  if (VerboseAsm) {
278    WriteAsOperand(OutStreamer.GetCommentOS(), GV,
279                   /*PrintType=*/false, GV->getParent());
280    OutStreamer.GetCommentOS() << '\n';
281  }
282  OutStreamer.EmitLabel(GVSym);
283
284  EmitGlobalConstant(GV->getInitializer());
285
286  if (MAI->hasDotTypeDotSizeDirective())
287    // .size foo, 42
288    OutStreamer.EmitELFSize(GVSym, MCConstantExpr::Create(Size, OutContext));
289
290  OutStreamer.AddBlankLine();
291}
292
293/// EmitFunctionHeader - This method emits the header for the current
294/// function.
295void AsmPrinter::EmitFunctionHeader() {
296  // Print out constants referenced by the function
297  EmitConstantPool();
298
299  // Print the 'header' of function.
300  const Function *F = MF->getFunction();
301
302  OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
303  EmitVisibility(CurrentFnSym, F->getVisibility());
304
305  EmitLinkage(F->getLinkage(), CurrentFnSym);
306  EmitAlignment(MF->getAlignment(), F);
307
308  if (MAI->hasDotTypeDotSizeDirective())
309    OutStreamer.EmitSymbolAttribute(CurrentFnSym, MCSA_ELF_TypeFunction);
310
311  if (VerboseAsm) {
312    WriteAsOperand(OutStreamer.GetCommentOS(), F,
313                   /*PrintType=*/false, F->getParent());
314    OutStreamer.GetCommentOS() << '\n';
315  }
316
317  // Emit the CurrentFnSym.  This is is a virtual function to allow targets to
318  // do their wild and crazy things as required.
319  EmitFunctionEntryLabel();
320
321  // Add some workaround for linkonce linkage on Cygwin\MinGW.
322  if (MAI->getLinkOnceDirective() != 0 &&
323      (F->hasLinkOnceLinkage() || F->hasWeakLinkage()))
324    // FIXME: What is this?
325    O << "Lllvm$workaround$fake$stub$" << *CurrentFnSym << ":\n";
326
327  // Emit pre-function debug and/or EH information.
328  if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
329    DW->BeginFunction(MF);
330}
331
332/// EmitFunctionEntryLabel - Emit the label that is the entrypoint for the
333/// function.  This can be overridden by targets as required to do custom stuff.
334void AsmPrinter::EmitFunctionEntryLabel() {
335  OutStreamer.EmitLabel(CurrentFnSym);
336}
337
338
339bool AsmPrinter::doFinalization(Module &M) {
340  // Emit global variables.
341  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
342       I != E; ++I)
343    EmitGlobalVariable(I);
344
345  // Emit final debug information.
346  if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
347    DW->EndModule();
348
349  // If the target wants to know about weak references, print them all.
350  if (MAI->getWeakRefDirective()) {
351    // FIXME: This is not lazy, it would be nice to only print weak references
352    // to stuff that is actually used.  Note that doing so would require targets
353    // to notice uses in operands (due to constant exprs etc).  This should
354    // happen with the MC stuff eventually.
355
356    // Print out module-level global variables here.
357    for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
358         I != E; ++I) {
359      if (!I->hasExternalWeakLinkage()) continue;
360      OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(I),
361                                      MCSA_WeakReference);
362    }
363
364    for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
365      if (!I->hasExternalWeakLinkage()) continue;
366      OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(I),
367                                      MCSA_WeakReference);
368    }
369  }
370
371  if (MAI->hasSetDirective()) {
372    OutStreamer.AddBlankLine();
373    for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
374         I != E; ++I) {
375      MCSymbol *Name = GetGlobalValueSymbol(I);
376
377      const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
378      MCSymbol *Target = GetGlobalValueSymbol(GV);
379
380      if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
381        OutStreamer.EmitSymbolAttribute(Name, MCSA_Global);
382      else if (I->hasWeakLinkage())
383        OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference);
384      else
385        assert(I->hasLocalLinkage() && "Invalid alias linkage");
386
387      EmitVisibility(Name, I->getVisibility());
388
389      // Emit the directives as assignments aka .set:
390      OutStreamer.EmitAssignment(Name,
391                                 MCSymbolRefExpr::Create(Target, OutContext));
392    }
393  }
394
395  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
396  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
397  for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
398    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
399      MP->finishAssembly(O, *this, *MAI);
400
401  // If we don't have any trampolines, then we don't require stack memory
402  // to be executable. Some targets have a directive to declare this.
403  Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
404  if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
405    if (MCSection *S = MAI->getNonexecutableStackSection(OutContext))
406      OutStreamer.SwitchSection(S);
407
408  // Allow the target to emit any magic that it wants at the end of the file,
409  // after everything else has gone out.
410  EmitEndOfAsmFile(M);
411
412  delete Mang; Mang = 0;
413  DW = 0; MMI = 0;
414
415  OutStreamer.Finish();
416  return false;
417}
418
419void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
420  this->MF = &MF;
421  // Get the function symbol.
422  CurrentFnSym = GetGlobalValueSymbol(MF.getFunction());
423
424  if (VerboseAsm)
425    LI = &getAnalysis<MachineLoopInfo>();
426}
427
428namespace {
429  // SectionCPs - Keep track the alignment, constpool entries per Section.
430  struct SectionCPs {
431    const MCSection *S;
432    unsigned Alignment;
433    SmallVector<unsigned, 4> CPEs;
434    SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {}
435  };
436}
437
438/// EmitConstantPool - Print to the current output stream assembly
439/// representations of the constants in the constant pool MCP. This is
440/// used to print out constants which have been "spilled to memory" by
441/// the code generator.
442///
443void AsmPrinter::EmitConstantPool() {
444  const MachineConstantPool *MCP = MF->getConstantPool();
445  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
446  if (CP.empty()) return;
447
448  // Calculate sections for constant pool entries. We collect entries to go into
449  // the same section together to reduce amount of section switch statements.
450  SmallVector<SectionCPs, 4> CPSections;
451  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
452    const MachineConstantPoolEntry &CPE = CP[i];
453    unsigned Align = CPE.getAlignment();
454
455    SectionKind Kind;
456    switch (CPE.getRelocationInfo()) {
457    default: llvm_unreachable("Unknown section kind");
458    case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
459    case 1:
460      Kind = SectionKind::getReadOnlyWithRelLocal();
461      break;
462    case 0:
463    switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
464    case 4:  Kind = SectionKind::getMergeableConst4(); break;
465    case 8:  Kind = SectionKind::getMergeableConst8(); break;
466    case 16: Kind = SectionKind::getMergeableConst16();break;
467    default: Kind = SectionKind::getMergeableConst(); break;
468    }
469    }
470
471    const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
472
473    // The number of sections are small, just do a linear search from the
474    // last section to the first.
475    bool Found = false;
476    unsigned SecIdx = CPSections.size();
477    while (SecIdx != 0) {
478      if (CPSections[--SecIdx].S == S) {
479        Found = true;
480        break;
481      }
482    }
483    if (!Found) {
484      SecIdx = CPSections.size();
485      CPSections.push_back(SectionCPs(S, Align));
486    }
487
488    if (Align > CPSections[SecIdx].Alignment)
489      CPSections[SecIdx].Alignment = Align;
490    CPSections[SecIdx].CPEs.push_back(i);
491  }
492
493  // Now print stuff into the calculated sections.
494  for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
495    OutStreamer.SwitchSection(CPSections[i].S);
496    EmitAlignment(Log2_32(CPSections[i].Alignment));
497
498    unsigned Offset = 0;
499    for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
500      unsigned CPI = CPSections[i].CPEs[j];
501      MachineConstantPoolEntry CPE = CP[CPI];
502
503      // Emit inter-object padding for alignment.
504      unsigned AlignMask = CPE.getAlignment() - 1;
505      unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
506      OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/);
507
508      const Type *Ty = CPE.getType();
509      Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
510
511      // Emit the label with a comment on it.
512      if (VerboseAsm) {
513        OutStreamer.GetCommentOS() << "constant pool ";
514        WriteTypeSymbolic(OutStreamer.GetCommentOS(), CPE.getType(),
515                          MF->getFunction()->getParent());
516        OutStreamer.GetCommentOS() << '\n';
517      }
518      OutStreamer.EmitLabel(GetCPISymbol(CPI));
519
520      if (CPE.isMachineConstantPoolEntry())
521        EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
522      else
523        EmitGlobalConstant(CPE.Val.ConstVal);
524    }
525  }
526}
527
528/// EmitJumpTableInfo - Print assembly representations of the jump tables used
529/// by the current function to the current output stream.
530///
531void AsmPrinter::EmitJumpTableInfo(MachineFunction &MF) {
532  MachineJumpTableInfo *MJTI = MF.getJumpTableInfo();
533  if (MJTI == 0) return;
534  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
535  if (JT.empty()) return;
536
537  // Pick the directive to use to print the jump table entries, and switch to
538  // the appropriate section.
539  const Function *F = MF.getFunction();
540  bool JTInDiffSection = false;
541  if (// In PIC mode, we need to emit the jump table to the same section as the
542      // function body itself, otherwise the label differences won't make sense.
543      // FIXME: Need a better predicate for this: what about custom entries?
544      MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 ||
545      // We should also do if the section name is NULL or function is declared
546      // in discardable section
547      // FIXME: this isn't the right predicate, should be based on the MCSection
548      // for the function.
549      F->isWeakForLinker()) {
550    OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang,
551                                                                    TM));
552  } else {
553    // Otherwise, drop it in the readonly section.
554    const MCSection *ReadOnlySection =
555      getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
556    OutStreamer.SwitchSection(ReadOnlySection);
557    JTInDiffSection = true;
558  }
559
560  EmitAlignment(Log2_32(MJTI->getEntryAlignment(*TM.getTargetData())));
561
562  for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
563    const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
564
565    // If this jump table was deleted, ignore it.
566    if (JTBBs.empty()) continue;
567
568    // For the EK_LabelDifference32 entry, if the target supports .set, emit a
569    // .set directive for each unique entry.  This reduces the number of
570    // relocations the assembler will generate for the jump table.
571    if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 &&
572        MAI->hasSetDirective()) {
573      SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets;
574      const TargetLowering *TLI = TM.getTargetLowering();
575      const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(&MF, JTI,
576                                                             OutContext);
577      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
578        const MachineBasicBlock *MBB = JTBBs[ii];
579        if (!EmittedSets.insert(MBB)) continue;
580
581        // .set LJTSet, LBB32-base
582        const MCExpr *LHS =
583          MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext);
584        OutStreamer.EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
585                                MCBinaryExpr::CreateSub(LHS, Base, OutContext));
586      }
587    }
588
589    // On some targets (e.g. Darwin) we want to emit two consequtive labels
590    // before each jump table.  The first label is never referenced, but tells
591    // the assembler and linker the extents of the jump table object.  The
592    // second label is actually referenced by the code.
593    if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0])
594      // FIXME: This doesn't have to have any specific name, just any randomly
595      // named and numbered 'l' label would work.  Simplify GetJTISymbol.
596      OutStreamer.EmitLabel(GetJTISymbol(JTI, true));
597
598    OutStreamer.EmitLabel(GetJTISymbol(JTI));
599
600    for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
601      EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
602  }
603}
604
605/// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
606/// current stream.
607void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
608                                    const MachineBasicBlock *MBB,
609                                    unsigned UID) const {
610  const MCExpr *Value = 0;
611  switch (MJTI->getEntryKind()) {
612  case MachineJumpTableInfo::EK_Custom32:
613    Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, UID,
614                                                              OutContext);
615    break;
616  case MachineJumpTableInfo::EK_BlockAddress:
617    // EK_BlockAddress - Each entry is a plain address of block, e.g.:
618    //     .word LBB123
619    Value = MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext);
620    break;
621  case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
622    // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
623    // with a relocation as gp-relative, e.g.:
624    //     .gprel32 LBB123
625    MCSymbol *MBBSym = MBB->getSymbol(OutContext);
626    OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
627    return;
628  }
629
630  case MachineJumpTableInfo::EK_LabelDifference32: {
631    // EK_LabelDifference32 - Each entry is the address of the block minus
632    // the address of the jump table.  This is used for PIC jump tables where
633    // gprel32 is not supported.  e.g.:
634    //      .word LBB123 - LJTI1_2
635    // If the .set directive is supported, this is emitted as:
636    //      .set L4_5_set_123, LBB123 - LJTI1_2
637    //      .word L4_5_set_123
638
639    // If we have emitted set directives for the jump table entries, print
640    // them rather than the entries themselves.  If we're emitting PIC, then
641    // emit the table entries as differences between two text section labels.
642    if (MAI->hasSetDirective()) {
643      // If we used .set, reference the .set's symbol.
644      Value = MCSymbolRefExpr::Create(GetJTSetSymbol(UID, MBB->getNumber()),
645                                      OutContext);
646      break;
647    }
648    // Otherwise, use the difference as the jump table entry.
649    Value = MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext);
650    const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(UID), OutContext);
651    Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext);
652    break;
653  }
654  }
655
656  assert(Value && "Unknown entry kind!");
657
658  unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData());
659  OutStreamer.EmitValue(Value, EntrySize, /*addrspace*/0);
660}
661
662
663/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
664/// special global used by LLVM.  If so, emit it and return true, otherwise
665/// do nothing and return false.
666bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
667  if (GV->getName() == "llvm.used") {
668    if (MAI->hasNoDeadStrip())    // No need to emit this at all.
669      EmitLLVMUsedList(GV->getInitializer());
670    return true;
671  }
672
673  // Ignore debug and non-emitted data.  This handles llvm.compiler.used.
674  if (GV->getSection() == "llvm.metadata" ||
675      GV->hasAvailableExternallyLinkage())
676    return true;
677
678  if (!GV->hasAppendingLinkage()) return false;
679
680  assert(GV->hasInitializer() && "Not a special LLVM global!");
681
682  const TargetData *TD = TM.getTargetData();
683  unsigned Align = Log2_32(TD->getPointerPrefAlignment());
684  if (GV->getName() == "llvm.global_ctors") {
685    OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
686    EmitAlignment(Align, 0);
687    EmitXXStructorList(GV->getInitializer());
688
689    if (TM.getRelocationModel() == Reloc::Static &&
690        MAI->hasStaticCtorDtorReferenceInStaticMode()) {
691      StringRef Sym(".constructors_used");
692      OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
693                                      MCSA_Reference);
694    }
695    return true;
696  }
697
698  if (GV->getName() == "llvm.global_dtors") {
699    OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
700    EmitAlignment(Align, 0);
701    EmitXXStructorList(GV->getInitializer());
702
703    if (TM.getRelocationModel() == Reloc::Static &&
704        MAI->hasStaticCtorDtorReferenceInStaticMode()) {
705      StringRef Sym(".destructors_used");
706      OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
707                                      MCSA_Reference);
708    }
709    return true;
710  }
711
712  return false;
713}
714
715/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
716/// global in the specified llvm.used list for which emitUsedDirectiveFor
717/// is true, as being used with this directive.
718void AsmPrinter::EmitLLVMUsedList(Constant *List) {
719  // Should be an array of 'i8*'.
720  ConstantArray *InitList = dyn_cast<ConstantArray>(List);
721  if (InitList == 0) return;
722
723  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
724    const GlobalValue *GV =
725      dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
726    if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang))
727      OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(GV),
728                                      MCSA_NoDeadStrip);
729  }
730}
731
732/// EmitXXStructorList - Emit the ctor or dtor list.  This just prints out the
733/// function pointers, ignoring the init priority.
734void AsmPrinter::EmitXXStructorList(Constant *List) {
735  // Should be an array of '{ int, void ()* }' structs.  The first value is the
736  // init priority, which we ignore.
737  if (!isa<ConstantArray>(List)) return;
738  ConstantArray *InitList = cast<ConstantArray>(List);
739  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
740    if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
741      if (CS->getNumOperands() != 2) return;  // Not array of 2-element structs.
742
743      if (CS->getOperand(1)->isNullValue())
744        return;  // Found a null terminator, exit printing.
745      // Emit the function pointer.
746      EmitGlobalConstant(CS->getOperand(1));
747    }
748}
749
750//===--------------------------------------------------------------------===//
751// Emission and print routines
752//
753
754/// EmitInt8 - Emit a byte directive and value.
755///
756void AsmPrinter::EmitInt8(int Value) const {
757  OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/);
758}
759
760/// EmitInt16 - Emit a short directive and value.
761///
762void AsmPrinter::EmitInt16(int Value) const {
763  OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/);
764}
765
766/// EmitInt32 - Emit a long directive and value.
767///
768void AsmPrinter::EmitInt32(int Value) const {
769  OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/);
770}
771
772/// EmitInt64 - Emit a long long directive and value.
773///
774void AsmPrinter::EmitInt64(uint64_t Value) const {
775  OutStreamer.EmitIntValue(Value, 8, 0/*addrspace*/);
776}
777
778//===----------------------------------------------------------------------===//
779
780// EmitAlignment - Emit an alignment directive to the specified power of
781// two boundary.  For example, if you pass in 3 here, you will get an 8
782// byte alignment.  If a global value is specified, and if that global has
783// an explicit alignment requested, it will unconditionally override the
784// alignment request.  However, if ForcedAlignBits is specified, this value
785// has final say: the ultimate alignment will be the max of ForcedAlignBits
786// and the alignment computed with NumBits and the global.
787//
788// The algorithm is:
789//     Align = NumBits;
790//     if (GV && GV->hasalignment) Align = GV->getalignment();
791//     Align = std::max(Align, ForcedAlignBits);
792//
793void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
794                               unsigned ForcedAlignBits,
795                               bool UseFillExpr) const {
796  if (GV && GV->getAlignment())
797    NumBits = Log2_32(GV->getAlignment());
798  NumBits = std::max(NumBits, ForcedAlignBits);
799
800  if (NumBits == 0) return;   // No need to emit alignment.
801
802  unsigned FillValue = 0;
803  if (getCurrentSection()->getKind().isText())
804    FillValue = MAI->getTextAlignFillValue();
805
806  OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0);
807}
808
809/// LowerConstant - Lower the specified LLVM Constant to an MCExpr.
810///
811static const MCExpr *LowerConstant(const Constant *CV, AsmPrinter &AP) {
812  MCContext &Ctx = AP.OutContext;
813
814  if (CV->isNullValue() || isa<UndefValue>(CV))
815    return MCConstantExpr::Create(0, Ctx);
816
817  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
818    return MCConstantExpr::Create(CI->getZExtValue(), Ctx);
819
820  if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
821    return MCSymbolRefExpr::Create(AP.GetGlobalValueSymbol(GV), Ctx);
822  if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
823    return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx);
824
825  const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
826  if (CE == 0) {
827    llvm_unreachable("Unknown constant value to lower!");
828    return MCConstantExpr::Create(0, Ctx);
829  }
830
831  switch (CE->getOpcode()) {
832  case Instruction::ZExt:
833  case Instruction::SExt:
834  case Instruction::FPTrunc:
835  case Instruction::FPExt:
836  case Instruction::UIToFP:
837  case Instruction::SIToFP:
838  case Instruction::FPToUI:
839  case Instruction::FPToSI:
840  default: llvm_unreachable("FIXME: Don't support this constant cast expr");
841  case Instruction::GetElementPtr: {
842    const TargetData &TD = *AP.TM.getTargetData();
843    // Generate a symbolic expression for the byte address
844    const Constant *PtrVal = CE->getOperand(0);
845    SmallVector<Value*, 8> IdxVec(CE->op_begin()+1, CE->op_end());
846    int64_t Offset = TD.getIndexedOffset(PtrVal->getType(), &IdxVec[0],
847                                         IdxVec.size());
848
849    const MCExpr *Base = LowerConstant(CE->getOperand(0), AP);
850    if (Offset == 0)
851      return Base;
852
853    // Truncate/sext the offset to the pointer size.
854    if (TD.getPointerSizeInBits() != 64) {
855      int SExtAmount = 64-TD.getPointerSizeInBits();
856      Offset = (Offset << SExtAmount) >> SExtAmount;
857    }
858
859    return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx),
860                                   Ctx);
861  }
862
863  case Instruction::Trunc:
864    // We emit the value and depend on the assembler to truncate the generated
865    // expression properly.  This is important for differences between
866    // blockaddress labels.  Since the two labels are in the same function, it
867    // is reasonable to treat their delta as a 32-bit value.
868    // FALL THROUGH.
869  case Instruction::BitCast:
870    return LowerConstant(CE->getOperand(0), AP);
871
872  case Instruction::IntToPtr: {
873    const TargetData &TD = *AP.TM.getTargetData();
874    // Handle casts to pointers by changing them into casts to the appropriate
875    // integer type.  This promotes constant folding and simplifies this code.
876    Constant *Op = CE->getOperand(0);
877    Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()),
878                                      false/*ZExt*/);
879    return LowerConstant(Op, AP);
880  }
881
882  case Instruction::PtrToInt: {
883    const TargetData &TD = *AP.TM.getTargetData();
884    // Support only foldable casts to/from pointers that can be eliminated by
885    // changing the pointer to the appropriately sized integer type.
886    Constant *Op = CE->getOperand(0);
887    const Type *Ty = CE->getType();
888
889    const MCExpr *OpExpr = LowerConstant(Op, AP);
890
891    // We can emit the pointer value into this slot if the slot is an
892    // integer slot equal to the size of the pointer.
893    if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType()))
894      return OpExpr;
895
896    // Otherwise the pointer is smaller than the resultant integer, mask off
897    // the high bits so we are sure to get a proper truncation if the input is
898    // a constant expr.
899    unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType());
900    const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx);
901    return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx);
902  }
903
904  case Instruction::Add:
905  case Instruction::Sub:
906  case Instruction::And:
907  case Instruction::Or:
908  case Instruction::Xor: {
909    const MCExpr *LHS = LowerConstant(CE->getOperand(0), AP);
910    const MCExpr *RHS = LowerConstant(CE->getOperand(1), AP);
911    switch (CE->getOpcode()) {
912    default: llvm_unreachable("Unknown binary operator constant cast expr");
913    case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx);
914    case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx);
915    case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx);
916    case Instruction::Or:  return MCBinaryExpr::CreateOr (LHS, RHS, Ctx);
917    case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx);
918    }
919  }
920  }
921}
922
923static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace,
924                                    AsmPrinter &AP) {
925  if (AddrSpace != 0 || !CA->isString()) {
926    // Not a string.  Print the values in successive locations
927    for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
928      AP.EmitGlobalConstant(CA->getOperand(i), AddrSpace);
929    return;
930  }
931
932  // Otherwise, it can be emitted as .ascii.
933  SmallVector<char, 128> TmpVec;
934  TmpVec.reserve(CA->getNumOperands());
935  for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
936    TmpVec.push_back(cast<ConstantInt>(CA->getOperand(i))->getZExtValue());
937
938  AP.OutStreamer.EmitBytes(StringRef(TmpVec.data(), TmpVec.size()), AddrSpace);
939}
940
941static void EmitGlobalConstantVector(const ConstantVector *CV,
942                                     unsigned AddrSpace, AsmPrinter &AP) {
943  for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
944    AP.EmitGlobalConstant(CV->getOperand(i), AddrSpace);
945}
946
947static void EmitGlobalConstantStruct(const ConstantStruct *CS,
948                                     unsigned AddrSpace, AsmPrinter &AP) {
949  // Print the fields in successive locations. Pad to align if needed!
950  const TargetData *TD = AP.TM.getTargetData();
951  unsigned Size = TD->getTypeAllocSize(CS->getType());
952  const StructLayout *Layout = TD->getStructLayout(CS->getType());
953  uint64_t SizeSoFar = 0;
954  for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
955    const Constant *Field = CS->getOperand(i);
956
957    // Check if padding is needed and insert one or more 0s.
958    uint64_t FieldSize = TD->getTypeAllocSize(Field->getType());
959    uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
960                        - Layout->getElementOffset(i)) - FieldSize;
961    SizeSoFar += FieldSize + PadSize;
962
963    // Now print the actual field value.
964    AP.EmitGlobalConstant(Field, AddrSpace);
965
966    // Insert padding - this may include padding to increase the size of the
967    // current field up to the ABI size (if the struct is not packed) as well
968    // as padding to ensure that the next field starts at the right offset.
969    AP.OutStreamer.EmitZeros(PadSize, AddrSpace);
970  }
971  assert(SizeSoFar == Layout->getSizeInBytes() &&
972         "Layout of constant struct may be incorrect!");
973}
974
975static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace,
976                                 AsmPrinter &AP) {
977  // FP Constants are printed as integer constants to avoid losing
978  // precision.
979  if (CFP->getType()->isDoubleTy()) {
980    if (AP.VerboseAsm) {
981      double Val = CFP->getValueAPF().convertToDouble();
982      AP.OutStreamer.GetCommentOS() << "double " << Val << '\n';
983    }
984
985    uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
986    AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
987    return;
988  }
989
990  if (CFP->getType()->isFloatTy()) {
991    if (AP.VerboseAsm) {
992      float Val = CFP->getValueAPF().convertToFloat();
993      AP.OutStreamer.GetCommentOS() << "float " << Val << '\n';
994    }
995    uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
996    AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace);
997    return;
998  }
999
1000  if (CFP->getType()->isX86_FP80Ty()) {
1001    // all long double variants are printed as hex
1002    // api needed to prevent premature destruction
1003    APInt API = CFP->getValueAPF().bitcastToAPInt();
1004    const uint64_t *p = API.getRawData();
1005    if (AP.VerboseAsm) {
1006      // Convert to double so we can print the approximate val as a comment.
1007      APFloat DoubleVal = CFP->getValueAPF();
1008      bool ignored;
1009      DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1010                        &ignored);
1011      AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= "
1012        << DoubleVal.convertToDouble() << '\n';
1013    }
1014
1015    if (AP.TM.getTargetData()->isBigEndian()) {
1016      AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1017      AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1018    } else {
1019      AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1020      AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1021    }
1022
1023    // Emit the tail padding for the long double.
1024    const TargetData &TD = *AP.TM.getTargetData();
1025    AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) -
1026                             TD.getTypeStoreSize(CFP->getType()), AddrSpace);
1027    return;
1028  }
1029
1030  assert(CFP->getType()->isPPC_FP128Ty() &&
1031         "Floating point constant type not handled");
1032  // All long double variants are printed as hex api needed to prevent
1033  // premature destruction.
1034  APInt API = CFP->getValueAPF().bitcastToAPInt();
1035  const uint64_t *p = API.getRawData();
1036  if (AP.TM.getTargetData()->isBigEndian()) {
1037    AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1038    AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1039  } else {
1040    AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1041    AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1042  }
1043}
1044
1045static void EmitGlobalConstantLargeInt(const ConstantInt *CI,
1046                                       unsigned AddrSpace, AsmPrinter &AP) {
1047  const TargetData *TD = AP.TM.getTargetData();
1048  unsigned BitWidth = CI->getBitWidth();
1049  assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
1050
1051  // We don't expect assemblers to support integer data directives
1052  // for more than 64 bits, so we emit the data in at most 64-bit
1053  // quantities at a time.
1054  const uint64_t *RawData = CI->getValue().getRawData();
1055  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1056    uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i];
1057    AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1058  }
1059}
1060
1061/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1062void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1063  if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) {
1064    uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1065    return OutStreamer.EmitZeros(Size, AddrSpace);
1066  }
1067
1068  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1069    unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1070    switch (Size) {
1071    case 1:
1072    case 2:
1073    case 4:
1074    case 8:
1075      if (VerboseAsm)
1076        OutStreamer.GetCommentOS() << format("0x%llx\n", CI->getZExtValue());
1077      OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace);
1078      return;
1079    default:
1080      EmitGlobalConstantLargeInt(CI, AddrSpace, *this);
1081      return;
1082    }
1083  }
1084
1085  if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
1086    return EmitGlobalConstantArray(CVA, AddrSpace, *this);
1087
1088  if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
1089    return EmitGlobalConstantStruct(CVS, AddrSpace, *this);
1090
1091  if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
1092    return EmitGlobalConstantFP(CFP, AddrSpace, *this);
1093
1094  if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
1095    return EmitGlobalConstantVector(V, AddrSpace, *this);
1096
1097  if (isa<ConstantPointerNull>(CV)) {
1098    unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1099    OutStreamer.EmitIntValue(0, Size, AddrSpace);
1100    return;
1101  }
1102
1103  // Otherwise, it must be a ConstantExpr.  Lower it to an MCExpr, then emit it
1104  // thread the streamer with EmitValue.
1105  OutStreamer.EmitValue(LowerConstant(CV, *this),
1106                        TM.getTargetData()->getTypeAllocSize(CV->getType()),
1107                        AddrSpace);
1108}
1109
1110void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1111  // Target doesn't support this yet!
1112  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1113}
1114
1115/// PrintSpecial - Print information related to the specified machine instr
1116/// that is independent of the operand, and may be independent of the instr
1117/// itself.  This can be useful for portably encoding the comment character
1118/// or other bits of target-specific knowledge into the asmstrings.  The
1119/// syntax used is ${:comment}.  Targets can override this to add support
1120/// for their own strange codes.
1121void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1122  if (!strcmp(Code, "private")) {
1123    O << MAI->getPrivateGlobalPrefix();
1124  } else if (!strcmp(Code, "comment")) {
1125    if (VerboseAsm)
1126      O << MAI->getCommentString();
1127  } else if (!strcmp(Code, "uid")) {
1128    // Comparing the address of MI isn't sufficient, because machineinstrs may
1129    // be allocated to the same address across functions.
1130    const Function *ThisF = MI->getParent()->getParent()->getFunction();
1131
1132    // If this is a new LastFn instruction, bump the counter.
1133    if (LastMI != MI || LastFn != ThisF) {
1134      ++Counter;
1135      LastMI = MI;
1136      LastFn = ThisF;
1137    }
1138    O << Counter;
1139  } else {
1140    std::string msg;
1141    raw_string_ostream Msg(msg);
1142    Msg << "Unknown special formatter '" << Code
1143         << "' for machine instr: " << *MI;
1144    llvm_report_error(Msg.str());
1145  }
1146}
1147
1148/// processDebugLoc - Processes the debug information of each machine
1149/// instruction's DebugLoc.
1150void AsmPrinter::processDebugLoc(const MachineInstr *MI,
1151                                 bool BeforePrintingInsn) {
1152  if (!MAI || !DW || !MAI->doesSupportDebugInformation()
1153      || !DW->ShouldEmitDwarfDebug())
1154    return;
1155  DebugLoc DL = MI->getDebugLoc();
1156  if (DL.isUnknown())
1157    return;
1158  DILocation CurDLT = MF->getDILocation(DL);
1159  if (CurDLT.getScope().isNull())
1160    return;
1161
1162  if (!BeforePrintingInsn) {
1163    // After printing instruction
1164    DW->EndScope(MI);
1165  } else if (CurDLT.getNode() != PrevDLT) {
1166    unsigned L = DW->RecordSourceLine(CurDLT.getLineNumber(),
1167                                      CurDLT.getColumnNumber(),
1168                                      CurDLT.getScope().getNode());
1169    printLabel(L);
1170    O << '\n';
1171    DW->BeginScope(MI, L);
1172    PrevDLT = CurDLT.getNode();
1173  }
1174}
1175
1176
1177/// printInlineAsm - This method formats and prints the specified machine
1178/// instruction that is an inline asm.
1179void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1180  unsigned NumOperands = MI->getNumOperands();
1181
1182  // Count the number of register definitions.
1183  unsigned NumDefs = 0;
1184  for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1185       ++NumDefs)
1186    assert(NumDefs != NumOperands-1 && "No asm string?");
1187
1188  assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1189
1190  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1191  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1192
1193  O << '\t';
1194
1195  // If this asmstr is empty, just print the #APP/#NOAPP markers.
1196  // These are useful to see where empty asm's wound up.
1197  if (AsmStr[0] == 0) {
1198    O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1199    O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
1200    return;
1201  }
1202
1203  O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1204
1205  // The variant of the current asmprinter.
1206  int AsmPrinterVariant = MAI->getAssemblerDialect();
1207
1208  int CurVariant = -1;            // The number of the {.|.|.} region we are in.
1209  const char *LastEmitted = AsmStr; // One past the last character emitted.
1210
1211  while (*LastEmitted) {
1212    switch (*LastEmitted) {
1213    default: {
1214      // Not a special case, emit the string section literally.
1215      const char *LiteralEnd = LastEmitted+1;
1216      while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1217             *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1218        ++LiteralEnd;
1219      if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1220        O.write(LastEmitted, LiteralEnd-LastEmitted);
1221      LastEmitted = LiteralEnd;
1222      break;
1223    }
1224    case '\n':
1225      ++LastEmitted;   // Consume newline character.
1226      O << '\n';       // Indent code with newline.
1227      break;
1228    case '$': {
1229      ++LastEmitted;   // Consume '$' character.
1230      bool Done = true;
1231
1232      // Handle escapes.
1233      switch (*LastEmitted) {
1234      default: Done = false; break;
1235      case '$':     // $$ -> $
1236        if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1237          O << '$';
1238        ++LastEmitted;  // Consume second '$' character.
1239        break;
1240      case '(':             // $( -> same as GCC's { character.
1241        ++LastEmitted;      // Consume '(' character.
1242        if (CurVariant != -1) {
1243          llvm_report_error("Nested variants found in inline asm string: '"
1244                            + std::string(AsmStr) + "'");
1245        }
1246        CurVariant = 0;     // We're in the first variant now.
1247        break;
1248      case '|':
1249        ++LastEmitted;  // consume '|' character.
1250        if (CurVariant == -1)
1251          O << '|';       // this is gcc's behavior for | outside a variant
1252        else
1253          ++CurVariant;   // We're in the next variant.
1254        break;
1255      case ')':         // $) -> same as GCC's } char.
1256        ++LastEmitted;  // consume ')' character.
1257        if (CurVariant == -1)
1258          O << '}';     // this is gcc's behavior for } outside a variant
1259        else
1260          CurVariant = -1;
1261        break;
1262      }
1263      if (Done) break;
1264
1265      bool HasCurlyBraces = false;
1266      if (*LastEmitted == '{') {     // ${variable}
1267        ++LastEmitted;               // Consume '{' character.
1268        HasCurlyBraces = true;
1269      }
1270
1271      // If we have ${:foo}, then this is not a real operand reference, it is a
1272      // "magic" string reference, just like in .td files.  Arrange to call
1273      // PrintSpecial.
1274      if (HasCurlyBraces && *LastEmitted == ':') {
1275        ++LastEmitted;
1276        const char *StrStart = LastEmitted;
1277        const char *StrEnd = strchr(StrStart, '}');
1278        if (StrEnd == 0) {
1279          llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1280                            + std::string(AsmStr) + "'");
1281        }
1282
1283        std::string Val(StrStart, StrEnd);
1284        PrintSpecial(MI, Val.c_str());
1285        LastEmitted = StrEnd+1;
1286        break;
1287      }
1288
1289      const char *IDStart = LastEmitted;
1290      char *IDEnd;
1291      errno = 0;
1292      long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1293      if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1294        llvm_report_error("Bad $ operand number in inline asm string: '"
1295                          + std::string(AsmStr) + "'");
1296      }
1297      LastEmitted = IDEnd;
1298
1299      char Modifier[2] = { 0, 0 };
1300
1301      if (HasCurlyBraces) {
1302        // If we have curly braces, check for a modifier character.  This
1303        // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1304        if (*LastEmitted == ':') {
1305          ++LastEmitted;    // Consume ':' character.
1306          if (*LastEmitted == 0) {
1307            llvm_report_error("Bad ${:} expression in inline asm string: '"
1308                              + std::string(AsmStr) + "'");
1309          }
1310
1311          Modifier[0] = *LastEmitted;
1312          ++LastEmitted;    // Consume modifier character.
1313        }
1314
1315        if (*LastEmitted != '}') {
1316          llvm_report_error("Bad ${} expression in inline asm string: '"
1317                            + std::string(AsmStr) + "'");
1318        }
1319        ++LastEmitted;    // Consume '}' character.
1320      }
1321
1322      if ((unsigned)Val >= NumOperands-1) {
1323        llvm_report_error("Invalid $ operand number in inline asm string: '"
1324                          + std::string(AsmStr) + "'");
1325      }
1326
1327      // Okay, we finally have a value number.  Ask the target to print this
1328      // operand!
1329      if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1330        unsigned OpNo = 1;
1331
1332        bool Error = false;
1333
1334        // Scan to find the machine operand number for the operand.
1335        for (; Val; --Val) {
1336          if (OpNo >= MI->getNumOperands()) break;
1337          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1338          OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1339        }
1340
1341        if (OpNo >= MI->getNumOperands()) {
1342          Error = true;
1343        } else {
1344          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1345          ++OpNo;  // Skip over the ID number.
1346
1347          if (Modifier[0] == 'l')  // labels are target independent
1348            O << *MI->getOperand(OpNo).getMBB()->getSymbol(OutContext);
1349          else {
1350            AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1351            if ((OpFlags & 7) == 4) {
1352              Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1353                                                Modifier[0] ? Modifier : 0);
1354            } else {
1355              Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1356                                          Modifier[0] ? Modifier : 0);
1357            }
1358          }
1359        }
1360        if (Error) {
1361          std::string msg;
1362          raw_string_ostream Msg(msg);
1363          Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n";
1364          MI->print(Msg);
1365          llvm_report_error(Msg.str());
1366        }
1367      }
1368      break;
1369    }
1370    }
1371  }
1372  O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd();
1373}
1374
1375/// printImplicitDef - This method prints the specified machine instruction
1376/// that is an implicit def.
1377void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1378  if (!VerboseAsm) return;
1379  O.PadToColumn(MAI->getCommentColumn());
1380  O << MAI->getCommentString() << " implicit-def: "
1381    << TRI->getName(MI->getOperand(0).getReg());
1382}
1383
1384void AsmPrinter::printKill(const MachineInstr *MI) const {
1385  if (!VerboseAsm) return;
1386  O.PadToColumn(MAI->getCommentColumn());
1387  O << MAI->getCommentString() << " kill:";
1388  for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) {
1389    const MachineOperand &op = MI->getOperand(n);
1390    assert(op.isReg() && "KILL instruction must have only register operands");
1391    O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>");
1392  }
1393}
1394
1395/// printLabel - This method prints a local label used by debug and
1396/// exception handling tables.
1397void AsmPrinter::printLabel(const MachineInstr *MI) const {
1398  printLabel(MI->getOperand(0).getImm());
1399}
1400
1401void AsmPrinter::printLabel(unsigned Id) const {
1402  O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':';
1403}
1404
1405/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1406/// instruction, using the specified assembler variant.  Targets should
1407/// override this to format as appropriate.
1408bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1409                                 unsigned AsmVariant, const char *ExtraCode) {
1410  // Target doesn't support this yet!
1411  return true;
1412}
1413
1414bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1415                                       unsigned AsmVariant,
1416                                       const char *ExtraCode) {
1417  // Target doesn't support this yet!
1418  return true;
1419}
1420
1421MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA,
1422                                            const char *Suffix) const {
1423  return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock(), Suffix);
1424}
1425
1426MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F,
1427                                            const BasicBlock *BB,
1428                                            const char *Suffix) const {
1429  assert(BB->hasName() &&
1430         "Address of anonymous basic block not supported yet!");
1431
1432  // This code must use the function name itself, and not the function number,
1433  // since it must be possible to generate the label name from within other
1434  // functions.
1435  SmallString<60> FnName;
1436  Mang->getNameWithPrefix(FnName, F, false);
1437
1438  // FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME!
1439  SmallString<60> NameResult;
1440  Mang->getNameWithPrefix(NameResult,
1441                          StringRef("BA") + Twine((unsigned)FnName.size()) +
1442                          "_" + FnName.str() + "_" + BB->getName() + Suffix,
1443                          Mangler::Private);
1444
1445  return OutContext.GetOrCreateSymbol(NameResult.str());
1446}
1447
1448/// GetCPISymbol - Return the symbol for the specified constant pool entry.
1449MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
1450  SmallString<60> Name;
1451  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI"
1452    << getFunctionNumber() << '_' << CPID;
1453  return OutContext.GetOrCreateSymbol(Name.str());
1454}
1455
1456/// GetJTISymbol - Return the symbol for the specified jump table entry.
1457MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
1458  return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
1459}
1460
1461/// GetJTSetSymbol - Return the symbol for the specified jump table .set
1462/// FIXME: privatize to AsmPrinter.
1463MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
1464  SmallString<60> Name;
1465  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix()
1466    << getFunctionNumber() << '_' << UID << "_set_" << MBBID;
1467  return OutContext.GetOrCreateSymbol(Name.str());
1468}
1469
1470/// GetGlobalValueSymbol - Return the MCSymbol for the specified global
1471/// value.
1472MCSymbol *AsmPrinter::GetGlobalValueSymbol(const GlobalValue *GV) const {
1473  SmallString<60> NameStr;
1474  Mang->getNameWithPrefix(NameStr, GV, false);
1475  return OutContext.GetOrCreateSymbol(NameStr.str());
1476}
1477
1478/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
1479/// global value name as its base, with the specified suffix, and where the
1480/// symbol is forced to have private linkage if ForcePrivate is true.
1481MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
1482                                                   StringRef Suffix,
1483                                                   bool ForcePrivate) const {
1484  SmallString<60> NameStr;
1485  Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
1486  NameStr.append(Suffix.begin(), Suffix.end());
1487  return OutContext.GetOrCreateSymbol(NameStr.str());
1488}
1489
1490/// GetExternalSymbolSymbol - Return the MCSymbol for the specified
1491/// ExternalSymbol.
1492MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
1493  SmallString<60> NameStr;
1494  Mang->getNameWithPrefix(NameStr, Sym);
1495  return OutContext.GetOrCreateSymbol(NameStr.str());
1496}
1497
1498
1499
1500/// PrintParentLoopComment - Print comments about parent loops of this one.
1501static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1502                                   unsigned FunctionNumber) {
1503  if (Loop == 0) return;
1504  PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
1505  OS.indent(Loop->getLoopDepth()*2)
1506    << "Parent Loop BB" << FunctionNumber << "_"
1507    << Loop->getHeader()->getNumber()
1508    << " Depth=" << Loop->getLoopDepth() << '\n';
1509}
1510
1511
1512/// PrintChildLoopComment - Print comments about child loops within
1513/// the loop for this basic block, with nesting.
1514static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1515                                  unsigned FunctionNumber) {
1516  // Add child loop information
1517  for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
1518    OS.indent((*CL)->getLoopDepth()*2)
1519      << "Child Loop BB" << FunctionNumber << "_"
1520      << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
1521      << '\n';
1522    PrintChildLoopComment(OS, *CL, FunctionNumber);
1523  }
1524}
1525
1526/// EmitComments - Pretty-print comments for basic blocks.
1527static void PrintBasicBlockLoopComments(const MachineBasicBlock &MBB,
1528                                        const MachineLoopInfo *LI,
1529                                        const AsmPrinter &AP) {
1530  // Add loop depth information
1531  const MachineLoop *Loop = LI->getLoopFor(&MBB);
1532  if (Loop == 0) return;
1533
1534  MachineBasicBlock *Header = Loop->getHeader();
1535  assert(Header && "No header for loop");
1536
1537  // If this block is not a loop header, just print out what is the loop header
1538  // and return.
1539  if (Header != &MBB) {
1540    AP.OutStreamer.AddComment("  in Loop: Header=BB" +
1541                              Twine(AP.getFunctionNumber())+"_" +
1542                              Twine(Loop->getHeader()->getNumber())+
1543                              " Depth="+Twine(Loop->getLoopDepth()));
1544    return;
1545  }
1546
1547  // Otherwise, it is a loop header.  Print out information about child and
1548  // parent loops.
1549  raw_ostream &OS = AP.OutStreamer.GetCommentOS();
1550
1551  PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
1552
1553  OS << "=>";
1554  OS.indent(Loop->getLoopDepth()*2-2);
1555
1556  OS << "This ";
1557  if (Loop->empty())
1558    OS << "Inner ";
1559  OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
1560
1561  PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
1562}
1563
1564
1565/// EmitBasicBlockStart - This method prints the label for the specified
1566/// MachineBasicBlock, an alignment (if present) and a comment describing
1567/// it if appropriate.
1568void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
1569  // Emit an alignment directive for this block, if needed.
1570  if (unsigned Align = MBB->getAlignment())
1571    EmitAlignment(Log2_32(Align));
1572
1573  // If the block has its address taken, emit a special label to satisfy
1574  // references to the block. This is done so that we don't need to
1575  // remember the number of this label, and so that we can make
1576  // forward references to labels without knowing what their numbers
1577  // will be.
1578  if (MBB->hasAddressTaken()) {
1579    const BasicBlock *BB = MBB->getBasicBlock();
1580    if (VerboseAsm)
1581      OutStreamer.AddComment("Address Taken");
1582    OutStreamer.EmitLabel(GetBlockAddressSymbol(BB->getParent(), BB));
1583  }
1584
1585  // Print the main label for the block.
1586  if (MBB->pred_empty() || MBB->isOnlyReachableByFallthrough()) {
1587    if (VerboseAsm) {
1588      // NOTE: Want this comment at start of line.
1589      O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':';
1590      if (const BasicBlock *BB = MBB->getBasicBlock())
1591        if (BB->hasName())
1592          OutStreamer.AddComment("%" + BB->getName());
1593
1594      PrintBasicBlockLoopComments(*MBB, LI, *this);
1595      OutStreamer.AddBlankLine();
1596    }
1597  } else {
1598    if (VerboseAsm) {
1599      if (const BasicBlock *BB = MBB->getBasicBlock())
1600        if (BB->hasName())
1601          OutStreamer.AddComment("%" + BB->getName());
1602      PrintBasicBlockLoopComments(*MBB, LI, *this);
1603    }
1604
1605    OutStreamer.EmitLabel(MBB->getSymbol(OutContext));
1606  }
1607}
1608
1609void AsmPrinter::EmitVisibility(MCSymbol *Sym, unsigned Visibility) const {
1610  MCSymbolAttr Attr = MCSA_Invalid;
1611
1612  switch (Visibility) {
1613  default: break;
1614  case GlobalValue::HiddenVisibility:
1615    Attr = MAI->getHiddenVisibilityAttr();
1616    break;
1617  case GlobalValue::ProtectedVisibility:
1618    Attr = MAI->getProtectedVisibilityAttr();
1619    break;
1620  }
1621
1622  if (Attr != MCSA_Invalid)
1623    OutStreamer.EmitSymbolAttribute(Sym, Attr);
1624}
1625
1626void AsmPrinter::printOffset(int64_t Offset) const {
1627  if (Offset > 0)
1628    O << '+' << Offset;
1629  else if (Offset < 0)
1630    O << Offset;
1631}
1632
1633GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1634  if (!S->usesMetadata())
1635    return 0;
1636
1637  gcp_iterator GCPI = GCMetadataPrinters.find(S);
1638  if (GCPI != GCMetadataPrinters.end())
1639    return GCPI->second;
1640
1641  const char *Name = S->getName().c_str();
1642
1643  for (GCMetadataPrinterRegistry::iterator
1644         I = GCMetadataPrinterRegistry::begin(),
1645         E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1646    if (strcmp(Name, I->getName()) == 0) {
1647      GCMetadataPrinter *GMP = I->instantiate();
1648      GMP->S = S;
1649      GCMetadataPrinters.insert(std::make_pair(S, GMP));
1650      return GMP;
1651    }
1652
1653  llvm_report_error("no GCMetadataPrinter registered for GC: " + Twine(Name));
1654  return 0;
1655}
1656
1657/// EmitComments - Pretty-print comments for instructions
1658void AsmPrinter::EmitComments(const MachineInstr &MI) const {
1659  if (!VerboseAsm)
1660    return;
1661
1662  bool Newline = false;
1663
1664  if (!MI.getDebugLoc().isUnknown()) {
1665    DILocation DLT = MF->getDILocation(MI.getDebugLoc());
1666
1667    // Print source line info.
1668    O.PadToColumn(MAI->getCommentColumn());
1669    O << MAI->getCommentString() << ' ';
1670    DIScope Scope = DLT.getScope();
1671    // Omit the directory, because it's likely to be long and uninteresting.
1672    if (!Scope.isNull())
1673      O << Scope.getFilename();
1674    else
1675      O << "<unknown>";
1676    O << ':' << DLT.getLineNumber();
1677    if (DLT.getColumnNumber() != 0)
1678      O << ':' << DLT.getColumnNumber();
1679    Newline = true;
1680  }
1681
1682  // Check for spills and reloads
1683  int FI;
1684
1685  const MachineFrameInfo *FrameInfo =
1686    MI.getParent()->getParent()->getFrameInfo();
1687
1688  // We assume a single instruction only has a spill or reload, not
1689  // both.
1690  const MachineMemOperand *MMO;
1691  if (TM.getInstrInfo()->isLoadFromStackSlotPostFE(&MI, FI)) {
1692    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1693      MMO = *MI.memoperands_begin();
1694      if (Newline) O << '\n';
1695      O.PadToColumn(MAI->getCommentColumn());
1696      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Reload";
1697      Newline = true;
1698    }
1699  }
1700  else if (TM.getInstrInfo()->hasLoadFromStackSlot(&MI, MMO, FI)) {
1701    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1702      if (Newline) O << '\n';
1703      O.PadToColumn(MAI->getCommentColumn());
1704      O << MAI->getCommentString() << ' '
1705        << MMO->getSize() << "-byte Folded Reload";
1706      Newline = true;
1707    }
1708  }
1709  else if (TM.getInstrInfo()->isStoreToStackSlotPostFE(&MI, FI)) {
1710    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1711      MMO = *MI.memoperands_begin();
1712      if (Newline) O << '\n';
1713      O.PadToColumn(MAI->getCommentColumn());
1714      O << MAI->getCommentString() << ' ' << MMO->getSize() << "-byte Spill";
1715      Newline = true;
1716    }
1717  }
1718  else if (TM.getInstrInfo()->hasStoreToStackSlot(&MI, MMO, FI)) {
1719    if (FrameInfo->isSpillSlotObjectIndex(FI)) {
1720      if (Newline) O << '\n';
1721      O.PadToColumn(MAI->getCommentColumn());
1722      O << MAI->getCommentString() << ' '
1723        << MMO->getSize() << "-byte Folded Spill";
1724      Newline = true;
1725    }
1726  }
1727
1728  // Check for spill-induced copies
1729  unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
1730  if (TM.getInstrInfo()->isMoveInstr(MI, SrcReg, DstReg,
1731                                      SrcSubIdx, DstSubIdx)) {
1732    if (MI.getAsmPrinterFlag(ReloadReuse)) {
1733      if (Newline) O << '\n';
1734      O.PadToColumn(MAI->getCommentColumn());
1735      O << MAI->getCommentString() << " Reload Reuse";
1736    }
1737  }
1738}
1739
1740