AsmPrinter.cpp revision 2cf7251d39f28888af06b6f941eabd1d10995382 
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) {
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  printVisibility(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(MF->getConstantPool());
298
299  // Print the 'header' of function.
300  const Function *F = MF->getFunction();
301
302  OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
303  printVisibility(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      printVisibility(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(const MachineConstantPool *MCP) {
444  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
445  if (CP.empty()) return;
446
447  // Calculate sections for constant pool entries. We collect entries to go into
448  // the same section together to reduce amount of section switch statements.
449  SmallVector<SectionCPs, 4> CPSections;
450  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
451    const MachineConstantPoolEntry &CPE = CP[i];
452    unsigned Align = CPE.getAlignment();
453
454    SectionKind Kind;
455    switch (CPE.getRelocationInfo()) {
456    default: llvm_unreachable("Unknown section kind");
457    case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
458    case 1:
459      Kind = SectionKind::getReadOnlyWithRelLocal();
460      break;
461    case 0:
462    switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
463    case 4:  Kind = SectionKind::getMergeableConst4(); break;
464    case 8:  Kind = SectionKind::getMergeableConst8(); break;
465    case 16: Kind = SectionKind::getMergeableConst16();break;
466    default: Kind = SectionKind::getMergeableConst(); break;
467    }
468    }
469
470    const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
471
472    // The number of sections are small, just do a linear search from the
473    // last section to the first.
474    bool Found = false;
475    unsigned SecIdx = CPSections.size();
476    while (SecIdx != 0) {
477      if (CPSections[--SecIdx].S == S) {
478        Found = true;
479        break;
480      }
481    }
482    if (!Found) {
483      SecIdx = CPSections.size();
484      CPSections.push_back(SectionCPs(S, Align));
485    }
486
487    if (Align > CPSections[SecIdx].Alignment)
488      CPSections[SecIdx].Alignment = Align;
489    CPSections[SecIdx].CPEs.push_back(i);
490  }
491
492  // Now print stuff into the calculated sections.
493  for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
494    OutStreamer.SwitchSection(CPSections[i].S);
495    EmitAlignment(Log2_32(CPSections[i].Alignment));
496
497    unsigned Offset = 0;
498    for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
499      unsigned CPI = CPSections[i].CPEs[j];
500      MachineConstantPoolEntry CPE = CP[CPI];
501
502      // Emit inter-object padding for alignment.
503      unsigned AlignMask = CPE.getAlignment() - 1;
504      unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
505      OutStreamer.EmitFill(NewOffset - Offset, 0/*fillval*/, 0/*addrspace*/);
506
507      const Type *Ty = CPE.getType();
508      Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
509
510      // Emit the label with a comment on it.
511      if (VerboseAsm) {
512        OutStreamer.GetCommentOS() << "constant pool ";
513        WriteTypeSymbolic(OutStreamer.GetCommentOS(), CPE.getType(),
514                          MF->getFunction()->getParent());
515        OutStreamer.GetCommentOS() << '\n';
516      }
517      OutStreamer.EmitLabel(GetCPISymbol(CPI));
518
519      if (CPE.isMachineConstantPoolEntry())
520        EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
521      else
522        EmitGlobalConstant(CPE.Val.ConstVal);
523    }
524  }
525}
526
527/// EmitJumpTableInfo - Print assembly representations of the jump tables used
528/// by the current function to the current output stream.
529///
530void AsmPrinter::EmitJumpTableInfo(MachineFunction &MF) {
531  MachineJumpTableInfo *MJTI = MF.getJumpTableInfo();
532  if (MJTI == 0) return;
533  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
534  if (JT.empty()) return;
535
536  // Pick the directive to use to print the jump table entries, and switch to
537  // the appropriate section.
538  const Function *F = MF.getFunction();
539  bool JTInDiffSection = false;
540  if (// In PIC mode, we need to emit the jump table to the same section as the
541      // function body itself, otherwise the label differences won't make sense.
542      // FIXME: Need a better predicate for this: what about custom entries?
543      MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 ||
544      // We should also do if the section name is NULL or function is declared
545      // in discardable section
546      // FIXME: this isn't the right predicate, should be based on the MCSection
547      // for the function.
548      F->isWeakForLinker()) {
549    OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang,
550                                                                    TM));
551  } else {
552    // Otherwise, drop it in the readonly section.
553    const MCSection *ReadOnlySection =
554      getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
555    OutStreamer.SwitchSection(ReadOnlySection);
556    JTInDiffSection = true;
557  }
558
559  EmitAlignment(Log2_32(MJTI->getEntryAlignment(*TM.getTargetData())));
560
561  for (unsigned JTI = 0, e = JT.size(); JTI != e; ++JTI) {
562    const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs;
563
564    // If this jump table was deleted, ignore it.
565    if (JTBBs.empty()) continue;
566
567    // For the EK_LabelDifference32 entry, if the target supports .set, emit a
568    // .set directive for each unique entry.  This reduces the number of
569    // relocations the assembler will generate for the jump table.
570    if (MJTI->getEntryKind() == MachineJumpTableInfo::EK_LabelDifference32 &&
571        MAI->hasSetDirective()) {
572      SmallPtrSet<const MachineBasicBlock*, 16> EmittedSets;
573      const TargetLowering *TLI = TM.getTargetLowering();
574      const MCExpr *Base = TLI->getPICJumpTableRelocBaseExpr(&MF, JTI,
575                                                             OutContext);
576      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
577        const MachineBasicBlock *MBB = JTBBs[ii];
578        if (!EmittedSets.insert(MBB)) continue;
579
580        // .set LJTSet, LBB32-base
581        const MCExpr *LHS =
582          MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext);
583        OutStreamer.EmitAssignment(GetJTSetSymbol(JTI, MBB->getNumber()),
584                                MCBinaryExpr::CreateSub(LHS, Base, OutContext));
585      }
586    }
587
588    // On some targets (e.g. Darwin) we want to emit two consequtive labels
589    // before each jump table.  The first label is never referenced, but tells
590    // the assembler and linker the extents of the jump table object.  The
591    // second label is actually referenced by the code.
592    if (JTInDiffSection && MAI->getLinkerPrivateGlobalPrefix()[0])
593      // FIXME: This doesn't have to have any specific name, just any randomly
594      // named and numbered 'l' label would work.  Simplify GetJTISymbol.
595      OutStreamer.EmitLabel(GetJTISymbol(JTI, true));
596
597    OutStreamer.EmitLabel(GetJTISymbol(JTI));
598
599    for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
600      EmitJumpTableEntry(MJTI, JTBBs[ii], JTI);
601  }
602}
603
604/// EmitJumpTableEntry - Emit a jump table entry for the specified MBB to the
605/// current stream.
606void AsmPrinter::EmitJumpTableEntry(const MachineJumpTableInfo *MJTI,
607                                    const MachineBasicBlock *MBB,
608                                    unsigned UID) const {
609  const MCExpr *Value = 0;
610  switch (MJTI->getEntryKind()) {
611  case MachineJumpTableInfo::EK_Custom32:
612    Value = TM.getTargetLowering()->LowerCustomJumpTableEntry(MJTI, MBB, UID,
613                                                              OutContext);
614    break;
615  case MachineJumpTableInfo::EK_BlockAddress:
616    // EK_BlockAddress - Each entry is a plain address of block, e.g.:
617    //     .word LBB123
618    Value = MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext);
619    break;
620  case MachineJumpTableInfo::EK_GPRel32BlockAddress: {
621    // EK_GPRel32BlockAddress - Each entry is an address of block, encoded
622    // with a relocation as gp-relative, e.g.:
623    //     .gprel32 LBB123
624    MCSymbol *MBBSym = MBB->getSymbol(OutContext);
625    OutStreamer.EmitGPRel32Value(MCSymbolRefExpr::Create(MBBSym, OutContext));
626    return;
627  }
628
629  case MachineJumpTableInfo::EK_LabelDifference32: {
630    // EK_LabelDifference32 - Each entry is the address of the block minus
631    // the address of the jump table.  This is used for PIC jump tables where
632    // gprel32 is not supported.  e.g.:
633    //      .word LBB123 - LJTI1_2
634    // If the .set directive is supported, this is emitted as:
635    //      .set L4_5_set_123, LBB123 - LJTI1_2
636    //      .word L4_5_set_123
637
638    // If we have emitted set directives for the jump table entries, print
639    // them rather than the entries themselves.  If we're emitting PIC, then
640    // emit the table entries as differences between two text section labels.
641    if (MAI->hasSetDirective()) {
642      // If we used .set, reference the .set's symbol.
643      Value = MCSymbolRefExpr::Create(GetJTSetSymbol(UID, MBB->getNumber()),
644                                      OutContext);
645      break;
646    }
647    // Otherwise, use the difference as the jump table entry.
648    Value = MCSymbolRefExpr::Create(MBB->getSymbol(OutContext), OutContext);
649    const MCExpr *JTI = MCSymbolRefExpr::Create(GetJTISymbol(UID), OutContext);
650    Value = MCBinaryExpr::CreateSub(Value, JTI, OutContext);
651    break;
652  }
653  }
654
655  assert(Value && "Unknown entry kind!");
656
657  unsigned EntrySize = MJTI->getEntrySize(*TM.getTargetData());
658  OutStreamer.EmitValue(Value, EntrySize, /*addrspace*/0);
659}
660
661
662/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
663/// special global used by LLVM.  If so, emit it and return true, otherwise
664/// do nothing and return false.
665bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
666  if (GV->getName() == "llvm.used") {
667    if (MAI->hasNoDeadStrip())    // No need to emit this at all.
668      EmitLLVMUsedList(GV->getInitializer());
669    return true;
670  }
671
672  // Ignore debug and non-emitted data.  This handles llvm.compiler.used.
673  if (GV->getSection() == "llvm.metadata" ||
674      GV->hasAvailableExternallyLinkage())
675    return true;
676
677  if (!GV->hasAppendingLinkage()) return false;
678
679  assert(GV->hasInitializer() && "Not a special LLVM global!");
680
681  const TargetData *TD = TM.getTargetData();
682  unsigned Align = Log2_32(TD->getPointerPrefAlignment());
683  if (GV->getName() == "llvm.global_ctors") {
684    OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
685    EmitAlignment(Align, 0);
686    EmitXXStructorList(GV->getInitializer());
687
688    if (TM.getRelocationModel() == Reloc::Static &&
689        MAI->hasStaticCtorDtorReferenceInStaticMode()) {
690      StringRef Sym(".constructors_used");
691      OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
692                                      MCSA_Reference);
693    }
694    return true;
695  }
696
697  if (GV->getName() == "llvm.global_dtors") {
698    OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
699    EmitAlignment(Align, 0);
700    EmitXXStructorList(GV->getInitializer());
701
702    if (TM.getRelocationModel() == Reloc::Static &&
703        MAI->hasStaticCtorDtorReferenceInStaticMode()) {
704      StringRef Sym(".destructors_used");
705      OutStreamer.EmitSymbolAttribute(OutContext.GetOrCreateSymbol(Sym),
706                                      MCSA_Reference);
707    }
708    return true;
709  }
710
711  return false;
712}
713
714/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
715/// global in the specified llvm.used list for which emitUsedDirectiveFor
716/// is true, as being used with this directive.
717void AsmPrinter::EmitLLVMUsedList(Constant *List) {
718  // Should be an array of 'i8*'.
719  ConstantArray *InitList = dyn_cast<ConstantArray>(List);
720  if (InitList == 0) return;
721
722  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
723    const GlobalValue *GV =
724      dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
725    if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang))
726      OutStreamer.EmitSymbolAttribute(GetGlobalValueSymbol(GV),
727                                      MCSA_NoDeadStrip);
728  }
729}
730
731/// EmitXXStructorList - Emit the ctor or dtor list.  This just prints out the
732/// function pointers, ignoring the init priority.
733void AsmPrinter::EmitXXStructorList(Constant *List) {
734  // Should be an array of '{ int, void ()* }' structs.  The first value is the
735  // init priority, which we ignore.
736  if (!isa<ConstantArray>(List)) return;
737  ConstantArray *InitList = cast<ConstantArray>(List);
738  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
739    if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
740      if (CS->getNumOperands() != 2) return;  // Not array of 2-element structs.
741
742      if (CS->getOperand(1)->isNullValue())
743        return;  // Found a null terminator, exit printing.
744      // Emit the function pointer.
745      EmitGlobalConstant(CS->getOperand(1));
746    }
747}
748
749//===--------------------------------------------------------------------===//
750// Emission and print routines
751//
752
753/// EmitInt8 - Emit a byte directive and value.
754///
755void AsmPrinter::EmitInt8(int Value) const {
756  OutStreamer.EmitIntValue(Value, 1, 0/*addrspace*/);
757}
758
759/// EmitInt16 - Emit a short directive and value.
760///
761void AsmPrinter::EmitInt16(int Value) const {
762  OutStreamer.EmitIntValue(Value, 2, 0/*addrspace*/);
763}
764
765/// EmitInt32 - Emit a long directive and value.
766///
767void AsmPrinter::EmitInt32(int Value) const {
768  OutStreamer.EmitIntValue(Value, 4, 0/*addrspace*/);
769}
770
771/// EmitInt64 - Emit a long long directive and value.
772///
773void AsmPrinter::EmitInt64(uint64_t Value) const {
774  OutStreamer.EmitIntValue(Value, 8, 0/*addrspace*/);
775}
776
777//===----------------------------------------------------------------------===//
778
779// EmitAlignment - Emit an alignment directive to the specified power of
780// two boundary.  For example, if you pass in 3 here, you will get an 8
781// byte alignment.  If a global value is specified, and if that global has
782// an explicit alignment requested, it will unconditionally override the
783// alignment request.  However, if ForcedAlignBits is specified, this value
784// has final say: the ultimate alignment will be the max of ForcedAlignBits
785// and the alignment computed with NumBits and the global.
786//
787// The algorithm is:
788//     Align = NumBits;
789//     if (GV && GV->hasalignment) Align = GV->getalignment();
790//     Align = std::max(Align, ForcedAlignBits);
791//
792void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
793                               unsigned ForcedAlignBits,
794                               bool UseFillExpr) const {
795  if (GV && GV->getAlignment())
796    NumBits = Log2_32(GV->getAlignment());
797  NumBits = std::max(NumBits, ForcedAlignBits);
798
799  if (NumBits == 0) return;   // No need to emit alignment.
800
801  unsigned FillValue = 0;
802  if (getCurrentSection()->getKind().isText())
803    FillValue = MAI->getTextAlignFillValue();
804
805  OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0);
806}
807
808/// LowerConstant - Lower the specified LLVM Constant to an MCExpr.
809///
810static const MCExpr *LowerConstant(const Constant *CV, AsmPrinter &AP) {
811  MCContext &Ctx = AP.OutContext;
812
813  if (CV->isNullValue() || isa<UndefValue>(CV))
814    return MCConstantExpr::Create(0, Ctx);
815
816  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV))
817    return MCConstantExpr::Create(CI->getZExtValue(), Ctx);
818
819  if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
820    return MCSymbolRefExpr::Create(AP.GetGlobalValueSymbol(GV), Ctx);
821  if (const BlockAddress *BA = dyn_cast<BlockAddress>(CV))
822    return MCSymbolRefExpr::Create(AP.GetBlockAddressSymbol(BA), Ctx);
823
824  const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV);
825  if (CE == 0) {
826    llvm_unreachable("Unknown constant value to lower!");
827    return MCConstantExpr::Create(0, Ctx);
828  }
829
830  switch (CE->getOpcode()) {
831  case Instruction::ZExt:
832  case Instruction::SExt:
833  case Instruction::FPTrunc:
834  case Instruction::FPExt:
835  case Instruction::UIToFP:
836  case Instruction::SIToFP:
837  case Instruction::FPToUI:
838  case Instruction::FPToSI:
839  default: llvm_unreachable("FIXME: Don't support this constant cast expr");
840  case Instruction::GetElementPtr: {
841    const TargetData &TD = *AP.TM.getTargetData();
842    // Generate a symbolic expression for the byte address
843    const Constant *PtrVal = CE->getOperand(0);
844    SmallVector<Value*, 8> IdxVec(CE->op_begin()+1, CE->op_end());
845    int64_t Offset = TD.getIndexedOffset(PtrVal->getType(), &IdxVec[0],
846                                         IdxVec.size());
847
848    const MCExpr *Base = LowerConstant(CE->getOperand(0), AP);
849    if (Offset == 0)
850      return Base;
851
852    // Truncate/sext the offset to the pointer size.
853    if (TD.getPointerSizeInBits() != 64) {
854      int SExtAmount = 64-TD.getPointerSizeInBits();
855      Offset = (Offset << SExtAmount) >> SExtAmount;
856    }
857
858    return MCBinaryExpr::CreateAdd(Base, MCConstantExpr::Create(Offset, Ctx),
859                                   Ctx);
860  }
861
862  case Instruction::Trunc:
863    // We emit the value and depend on the assembler to truncate the generated
864    // expression properly.  This is important for differences between
865    // blockaddress labels.  Since the two labels are in the same function, it
866    // is reasonable to treat their delta as a 32-bit value.
867    // FALL THROUGH.
868  case Instruction::BitCast:
869    return LowerConstant(CE->getOperand(0), AP);
870
871  case Instruction::IntToPtr: {
872    const TargetData &TD = *AP.TM.getTargetData();
873    // Handle casts to pointers by changing them into casts to the appropriate
874    // integer type.  This promotes constant folding and simplifies this code.
875    Constant *Op = CE->getOperand(0);
876    Op = ConstantExpr::getIntegerCast(Op, TD.getIntPtrType(CV->getContext()),
877                                      false/*ZExt*/);
878    return LowerConstant(Op, AP);
879  }
880
881  case Instruction::PtrToInt: {
882    const TargetData &TD = *AP.TM.getTargetData();
883    // Support only foldable casts to/from pointers that can be eliminated by
884    // changing the pointer to the appropriately sized integer type.
885    Constant *Op = CE->getOperand(0);
886    const Type *Ty = CE->getType();
887
888    const MCExpr *OpExpr = LowerConstant(Op, AP);
889
890    // We can emit the pointer value into this slot if the slot is an
891    // integer slot equal to the size of the pointer.
892    if (TD.getTypeAllocSize(Ty) == TD.getTypeAllocSize(Op->getType()))
893      return OpExpr;
894
895    // Otherwise the pointer is smaller than the resultant integer, mask off
896    // the high bits so we are sure to get a proper truncation if the input is
897    // a constant expr.
898    unsigned InBits = TD.getTypeAllocSizeInBits(Op->getType());
899    const MCExpr *MaskExpr = MCConstantExpr::Create(~0ULL >> (64-InBits), Ctx);
900    return MCBinaryExpr::CreateAnd(OpExpr, MaskExpr, Ctx);
901  }
902
903  case Instruction::Add:
904  case Instruction::Sub:
905  case Instruction::And:
906  case Instruction::Or:
907  case Instruction::Xor: {
908    const MCExpr *LHS = LowerConstant(CE->getOperand(0), AP);
909    const MCExpr *RHS = LowerConstant(CE->getOperand(1), AP);
910    switch (CE->getOpcode()) {
911    default: llvm_unreachable("Unknown binary operator constant cast expr");
912    case Instruction::Add: return MCBinaryExpr::CreateAdd(LHS, RHS, Ctx);
913    case Instruction::Sub: return MCBinaryExpr::CreateSub(LHS, RHS, Ctx);
914    case Instruction::And: return MCBinaryExpr::CreateAnd(LHS, RHS, Ctx);
915    case Instruction::Or:  return MCBinaryExpr::CreateOr (LHS, RHS, Ctx);
916    case Instruction::Xor: return MCBinaryExpr::CreateXor(LHS, RHS, Ctx);
917    }
918  }
919  }
920}
921
922static void EmitGlobalConstantArray(const ConstantArray *CA, unsigned AddrSpace,
923                                    AsmPrinter &AP) {
924  if (AddrSpace != 0 || !CA->isString()) {
925    // Not a string.  Print the values in successive locations
926    for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
927      AP.EmitGlobalConstant(CA->getOperand(i), AddrSpace);
928    return;
929  }
930
931  // Otherwise, it can be emitted as .ascii.
932  SmallVector<char, 128> TmpVec;
933  TmpVec.reserve(CA->getNumOperands());
934  for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i)
935    TmpVec.push_back(cast<ConstantInt>(CA->getOperand(i))->getZExtValue());
936
937  AP.OutStreamer.EmitBytes(StringRef(TmpVec.data(), TmpVec.size()), AddrSpace);
938}
939
940static void EmitGlobalConstantVector(const ConstantVector *CV,
941                                     unsigned AddrSpace, AsmPrinter &AP) {
942  for (unsigned i = 0, e = CV->getType()->getNumElements(); i != e; ++i)
943    AP.EmitGlobalConstant(CV->getOperand(i), AddrSpace);
944}
945
946static void EmitGlobalConstantStruct(const ConstantStruct *CS,
947                                     unsigned AddrSpace, AsmPrinter &AP) {
948  // Print the fields in successive locations. Pad to align if needed!
949  const TargetData *TD = AP.TM.getTargetData();
950  unsigned Size = TD->getTypeAllocSize(CS->getType());
951  const StructLayout *Layout = TD->getStructLayout(CS->getType());
952  uint64_t SizeSoFar = 0;
953  for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) {
954    const Constant *Field = CS->getOperand(i);
955
956    // Check if padding is needed and insert one or more 0s.
957    uint64_t FieldSize = TD->getTypeAllocSize(Field->getType());
958    uint64_t PadSize = ((i == e-1 ? Size : Layout->getElementOffset(i+1))
959                        - Layout->getElementOffset(i)) - FieldSize;
960    SizeSoFar += FieldSize + PadSize;
961
962    // Now print the actual field value.
963    AP.EmitGlobalConstant(Field, AddrSpace);
964
965    // Insert padding - this may include padding to increase the size of the
966    // current field up to the ABI size (if the struct is not packed) as well
967    // as padding to ensure that the next field starts at the right offset.
968    AP.OutStreamer.EmitZeros(PadSize, AddrSpace);
969  }
970  assert(SizeSoFar == Layout->getSizeInBytes() &&
971         "Layout of constant struct may be incorrect!");
972}
973
974static void EmitGlobalConstantFP(const ConstantFP *CFP, unsigned AddrSpace,
975                                 AsmPrinter &AP) {
976  // FP Constants are printed as integer constants to avoid losing
977  // precision.
978  if (CFP->getType()->isDoubleTy()) {
979    if (AP.VerboseAsm) {
980      double Val = CFP->getValueAPF().convertToDouble();
981      AP.OutStreamer.GetCommentOS() << "double " << Val << '\n';
982    }
983
984    uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
985    AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
986    return;
987  }
988
989  if (CFP->getType()->isFloatTy()) {
990    if (AP.VerboseAsm) {
991      float Val = CFP->getValueAPF().convertToFloat();
992      AP.OutStreamer.GetCommentOS() << "float " << Val << '\n';
993    }
994    uint64_t Val = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
995    AP.OutStreamer.EmitIntValue(Val, 4, AddrSpace);
996    return;
997  }
998
999  if (CFP->getType()->isX86_FP80Ty()) {
1000    // all long double variants are printed as hex
1001    // api needed to prevent premature destruction
1002    APInt API = CFP->getValueAPF().bitcastToAPInt();
1003    const uint64_t *p = API.getRawData();
1004    if (AP.VerboseAsm) {
1005      // Convert to double so we can print the approximate val as a comment.
1006      APFloat DoubleVal = CFP->getValueAPF();
1007      bool ignored;
1008      DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1009                        &ignored);
1010      AP.OutStreamer.GetCommentOS() << "x86_fp80 ~= "
1011        << DoubleVal.convertToDouble() << '\n';
1012    }
1013
1014    if (AP.TM.getTargetData()->isBigEndian()) {
1015      AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1016      AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1017    } else {
1018      AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1019      AP.OutStreamer.EmitIntValue(p[1], 2, AddrSpace);
1020    }
1021
1022    // Emit the tail padding for the long double.
1023    const TargetData &TD = *AP.TM.getTargetData();
1024    AP.OutStreamer.EmitZeros(TD.getTypeAllocSize(CFP->getType()) -
1025                             TD.getTypeStoreSize(CFP->getType()), AddrSpace);
1026    return;
1027  }
1028
1029  assert(CFP->getType()->isPPC_FP128Ty() &&
1030         "Floating point constant type not handled");
1031  // All long double variants are printed as hex api needed to prevent
1032  // premature destruction.
1033  APInt API = CFP->getValueAPF().bitcastToAPInt();
1034  const uint64_t *p = API.getRawData();
1035  if (AP.TM.getTargetData()->isBigEndian()) {
1036    AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1037    AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1038  } else {
1039    AP.OutStreamer.EmitIntValue(p[1], 8, AddrSpace);
1040    AP.OutStreamer.EmitIntValue(p[0], 8, AddrSpace);
1041  }
1042}
1043
1044static void EmitGlobalConstantLargeInt(const ConstantInt *CI,
1045                                       unsigned AddrSpace, AsmPrinter &AP) {
1046  const TargetData *TD = AP.TM.getTargetData();
1047  unsigned BitWidth = CI->getBitWidth();
1048  assert((BitWidth & 63) == 0 && "only support multiples of 64-bits");
1049
1050  // We don't expect assemblers to support integer data directives
1051  // for more than 64 bits, so we emit the data in at most 64-bit
1052  // quantities at a time.
1053  const uint64_t *RawData = CI->getValue().getRawData();
1054  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1055    uint64_t Val = TD->isBigEndian() ? RawData[e - i - 1] : RawData[i];
1056    AP.OutStreamer.EmitIntValue(Val, 8, AddrSpace);
1057  }
1058}
1059
1060/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1061void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1062  if (isa<ConstantAggregateZero>(CV) || isa<UndefValue>(CV)) {
1063    uint64_t Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1064    return OutStreamer.EmitZeros(Size, AddrSpace);
1065  }
1066
1067  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1068    unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1069    switch (Size) {
1070    case 1:
1071    case 2:
1072    case 4:
1073    case 8:
1074      if (VerboseAsm)
1075        OutStreamer.GetCommentOS() << format("0x%llx\n", CI->getZExtValue());
1076      OutStreamer.EmitIntValue(CI->getZExtValue(), Size, AddrSpace);
1077      return;
1078    default:
1079      EmitGlobalConstantLargeInt(CI, AddrSpace, *this);
1080      return;
1081    }
1082  }
1083
1084  if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV))
1085    return EmitGlobalConstantArray(CVA, AddrSpace, *this);
1086
1087  if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV))
1088    return EmitGlobalConstantStruct(CVS, AddrSpace, *this);
1089
1090  if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV))
1091    return EmitGlobalConstantFP(CFP, AddrSpace, *this);
1092
1093  if (const ConstantVector *V = dyn_cast<ConstantVector>(CV))
1094    return EmitGlobalConstantVector(V, AddrSpace, *this);
1095
1096  if (isa<ConstantPointerNull>(CV)) {
1097    unsigned Size = TM.getTargetData()->getTypeAllocSize(CV->getType());
1098    OutStreamer.EmitIntValue(0, Size, AddrSpace);
1099    return;
1100  }
1101
1102  // Otherwise, it must be a ConstantExpr.  Lower it to an MCExpr, then emit it
1103  // thread the streamer with EmitValue.
1104  OutStreamer.EmitValue(LowerConstant(CV, *this),
1105                        TM.getTargetData()->getTypeAllocSize(CV->getType()),
1106                        AddrSpace);
1107}
1108
1109void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1110  // Target doesn't support this yet!
1111  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1112}
1113
1114/// PrintSpecial - Print information related to the specified machine instr
1115/// that is independent of the operand, and may be independent of the instr
1116/// itself.  This can be useful for portably encoding the comment character
1117/// or other bits of target-specific knowledge into the asmstrings.  The
1118/// syntax used is ${:comment}.  Targets can override this to add support
1119/// for their own strange codes.
1120void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1121  if (!strcmp(Code, "private")) {
1122    O << MAI->getPrivateGlobalPrefix();
1123  } else if (!strcmp(Code, "comment")) {
1124    if (VerboseAsm)
1125      O << MAI->getCommentString();
1126  } else if (!strcmp(Code, "uid")) {
1127    // Comparing the address of MI isn't sufficient, because machineinstrs may
1128    // be allocated to the same address across functions.
1129    const Function *ThisF = MI->getParent()->getParent()->getFunction();
1130
1131    // If this is a new LastFn instruction, bump the counter.
1132    if (LastMI != MI || LastFn != ThisF) {
1133      ++Counter;
1134      LastMI = MI;
1135      LastFn = ThisF;
1136    }
1137    O << Counter;
1138  } else {
1139    std::string msg;
1140    raw_string_ostream Msg(msg);
1141    Msg << "Unknown special formatter '" << Code
1142         << "' for machine instr: " << *MI;
1143    llvm_report_error(Msg.str());
1144  }
1145}
1146
1147/// processDebugLoc - Processes the debug information of each machine
1148/// instruction's DebugLoc.
1149void AsmPrinter::processDebugLoc(const MachineInstr *MI,
1150                                 bool BeforePrintingInsn) {
1151  if (!MAI || !DW || !MAI->doesSupportDebugInformation()
1152      || !DW->ShouldEmitDwarfDebug())
1153    return;
1154  DebugLoc DL = MI->getDebugLoc();
1155  if (DL.isUnknown())
1156    return;
1157  DILocation CurDLT = MF->getDILocation(DL);
1158  if (CurDLT.getScope().isNull())
1159    return;
1160
1161  if (!BeforePrintingInsn) {
1162    // After printing instruction
1163    DW->EndScope(MI);
1164  } else if (CurDLT.getNode() != PrevDLT) {
1165    unsigned L = DW->RecordSourceLine(CurDLT.getLineNumber(),
1166                                      CurDLT.getColumnNumber(),
1167                                      CurDLT.getScope().getNode());
1168    printLabel(L);
1169    O << '\n';
1170    DW->BeginScope(MI, L);
1171    PrevDLT = CurDLT.getNode();
1172  }
1173}
1174
1175
1176/// printInlineAsm - This method formats and prints the specified machine
1177/// instruction that is an inline asm.
1178void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1179  unsigned NumOperands = MI->getNumOperands();
1180
1181  // Count the number of register definitions.
1182  unsigned NumDefs = 0;
1183  for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1184       ++NumDefs)
1185    assert(NumDefs != NumOperands-1 && "No asm string?");
1186
1187  assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1188
1189  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1190  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1191
1192  O << '\t';
1193
1194  // If this asmstr is empty, just print the #APP/#NOAPP markers.
1195  // These are useful to see where empty asm's wound up.
1196  if (AsmStr[0] == 0) {
1197    O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1198    O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
1199    return;
1200  }
1201
1202  O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1203
1204  // The variant of the current asmprinter.
1205  int AsmPrinterVariant = MAI->getAssemblerDialect();
1206
1207  int CurVariant = -1;            // The number of the {.|.|.} region we are in.
1208  const char *LastEmitted = AsmStr; // One past the last character emitted.
1209
1210  while (*LastEmitted) {
1211    switch (*LastEmitted) {
1212    default: {
1213      // Not a special case, emit the string section literally.
1214      const char *LiteralEnd = LastEmitted+1;
1215      while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1216             *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1217        ++LiteralEnd;
1218      if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1219        O.write(LastEmitted, LiteralEnd-LastEmitted);
1220      LastEmitted = LiteralEnd;
1221      break;
1222    }
1223    case '\n':
1224      ++LastEmitted;   // Consume newline character.
1225      O << '\n';       // Indent code with newline.
1226      break;
1227    case '$': {
1228      ++LastEmitted;   // Consume '$' character.
1229      bool Done = true;
1230
1231      // Handle escapes.
1232      switch (*LastEmitted) {
1233      default: Done = false; break;
1234      case '$':     // $$ -> $
1235        if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1236          O << '$';
1237        ++LastEmitted;  // Consume second '$' character.
1238        break;
1239      case '(':             // $( -> same as GCC's { character.
1240        ++LastEmitted;      // Consume '(' character.
1241        if (CurVariant != -1) {
1242          llvm_report_error("Nested variants found in inline asm string: '"
1243                            + std::string(AsmStr) + "'");
1244        }
1245        CurVariant = 0;     // We're in the first variant now.
1246        break;
1247      case '|':
1248        ++LastEmitted;  // consume '|' character.
1249        if (CurVariant == -1)
1250          O << '|';       // this is gcc's behavior for | outside a variant
1251        else
1252          ++CurVariant;   // We're in the next variant.
1253        break;
1254      case ')':         // $) -> same as GCC's } char.
1255        ++LastEmitted;  // consume ')' character.
1256        if (CurVariant == -1)
1257          O << '}';     // this is gcc's behavior for } outside a variant
1258        else
1259          CurVariant = -1;
1260        break;
1261      }
1262      if (Done) break;
1263
1264      bool HasCurlyBraces = false;
1265      if (*LastEmitted == '{') {     // ${variable}
1266        ++LastEmitted;               // Consume '{' character.
1267        HasCurlyBraces = true;
1268      }
1269
1270      // If we have ${:foo}, then this is not a real operand reference, it is a
1271      // "magic" string reference, just like in .td files.  Arrange to call
1272      // PrintSpecial.
1273      if (HasCurlyBraces && *LastEmitted == ':') {
1274        ++LastEmitted;
1275        const char *StrStart = LastEmitted;
1276        const char *StrEnd = strchr(StrStart, '}');
1277        if (StrEnd == 0) {
1278          llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1279                            + std::string(AsmStr) + "'");
1280        }
1281
1282        std::string Val(StrStart, StrEnd);
1283        PrintSpecial(MI, Val.c_str());
1284        LastEmitted = StrEnd+1;
1285        break;
1286      }
1287
1288      const char *IDStart = LastEmitted;
1289      char *IDEnd;
1290      errno = 0;
1291      long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1292      if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1293        llvm_report_error("Bad $ operand number in inline asm string: '"
1294                          + std::string(AsmStr) + "'");
1295      }
1296      LastEmitted = IDEnd;
1297
1298      char Modifier[2] = { 0, 0 };
1299
1300      if (HasCurlyBraces) {
1301        // If we have curly braces, check for a modifier character.  This
1302        // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1303        if (*LastEmitted == ':') {
1304          ++LastEmitted;    // Consume ':' character.
1305          if (*LastEmitted == 0) {
1306            llvm_report_error("Bad ${:} expression in inline asm string: '"
1307                              + std::string(AsmStr) + "'");
1308          }
1309
1310          Modifier[0] = *LastEmitted;
1311          ++LastEmitted;    // Consume modifier character.
1312        }
1313
1314        if (*LastEmitted != '}') {
1315          llvm_report_error("Bad ${} expression in inline asm string: '"
1316                            + std::string(AsmStr) + "'");
1317        }
1318        ++LastEmitted;    // Consume '}' character.
1319      }
1320
1321      if ((unsigned)Val >= NumOperands-1) {
1322        llvm_report_error("Invalid $ operand number in inline asm string: '"
1323                          + std::string(AsmStr) + "'");
1324      }
1325
1326      // Okay, we finally have a value number.  Ask the target to print this
1327      // operand!
1328      if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1329        unsigned OpNo = 1;
1330
1331        bool Error = false;
1332
1333        // Scan to find the machine operand number for the operand.
1334        for (; Val; --Val) {
1335          if (OpNo >= MI->getNumOperands()) break;
1336          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1337          OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1338        }
1339
1340        if (OpNo >= MI->getNumOperands()) {
1341          Error = true;
1342        } else {
1343          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1344          ++OpNo;  // Skip over the ID number.
1345
1346          if (Modifier[0] == 'l')  // labels are target independent
1347            O << *MI->getOperand(OpNo).getMBB()->getSymbol(OutContext);
1348          else {
1349            AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1350            if ((OpFlags & 7) == 4) {
1351              Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1352                                                Modifier[0] ? Modifier : 0);
1353            } else {
1354              Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1355                                          Modifier[0] ? Modifier : 0);
1356            }
1357          }
1358        }
1359        if (Error) {
1360          std::string msg;
1361          raw_string_ostream Msg(msg);
1362          Msg << "Invalid operand found in inline asm: '" << AsmStr << "'\n";
1363          MI->print(Msg);
1364          llvm_report_error(Msg.str());
1365        }
1366      }
1367      break;
1368    }
1369    }
1370  }
1371  O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd();
1372}
1373
1374/// printImplicitDef - This method prints the specified machine instruction
1375/// that is an implicit def.
1376void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1377  if (!VerboseAsm) return;
1378  O.PadToColumn(MAI->getCommentColumn());
1379  O << MAI->getCommentString() << " implicit-def: "
1380    << TRI->getName(MI->getOperand(0).getReg());
1381}
1382
1383void AsmPrinter::printKill(const MachineInstr *MI) const {
1384  if (!VerboseAsm) return;
1385  O.PadToColumn(MAI->getCommentColumn());
1386  O << MAI->getCommentString() << " kill:";
1387  for (unsigned n = 0, e = MI->getNumOperands(); n != e; ++n) {
1388    const MachineOperand &op = MI->getOperand(n);
1389    assert(op.isReg() && "KILL instruction must have only register operands");
1390    O << ' ' << TRI->getName(op.getReg()) << (op.isDef() ? "<def>" : "<kill>");
1391  }
1392}
1393
1394/// printLabel - This method prints a local label used by debug and
1395/// exception handling tables.
1396void AsmPrinter::printLabel(const MachineInstr *MI) const {
1397  printLabel(MI->getOperand(0).getImm());
1398}
1399
1400void AsmPrinter::printLabel(unsigned Id) const {
1401  O << MAI->getPrivateGlobalPrefix() << "label" << Id << ':';
1402}
1403
1404/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1405/// instruction, using the specified assembler variant.  Targets should
1406/// override this to format as appropriate.
1407bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1408                                 unsigned AsmVariant, const char *ExtraCode) {
1409  // Target doesn't support this yet!
1410  return true;
1411}
1412
1413bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1414                                       unsigned AsmVariant,
1415                                       const char *ExtraCode) {
1416  // Target doesn't support this yet!
1417  return true;
1418}
1419
1420MCSymbol *AsmPrinter::GetBlockAddressSymbol(const BlockAddress *BA,
1421                                            const char *Suffix) const {
1422  return GetBlockAddressSymbol(BA->getFunction(), BA->getBasicBlock(), Suffix);
1423}
1424
1425MCSymbol *AsmPrinter::GetBlockAddressSymbol(const Function *F,
1426                                            const BasicBlock *BB,
1427                                            const char *Suffix) const {
1428  assert(BB->hasName() &&
1429         "Address of anonymous basic block not supported yet!");
1430
1431  // This code must use the function name itself, and not the function number,
1432  // since it must be possible to generate the label name from within other
1433  // functions.
1434  SmallString<60> FnName;
1435  Mang->getNameWithPrefix(FnName, F, false);
1436
1437  // FIXME: THIS IS BROKEN IF THE LLVM BASIC BLOCK DOESN'T HAVE A NAME!
1438  SmallString<60> NameResult;
1439  Mang->getNameWithPrefix(NameResult,
1440                          StringRef("BA") + Twine((unsigned)FnName.size()) +
1441                          "_" + FnName.str() + "_" + BB->getName() + Suffix,
1442                          Mangler::Private);
1443
1444  return OutContext.GetOrCreateSymbol(NameResult.str());
1445}
1446
1447/// GetCPISymbol - Return the symbol for the specified constant pool entry.
1448MCSymbol *AsmPrinter::GetCPISymbol(unsigned CPID) const {
1449  SmallString<60> Name;
1450  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix() << "CPI"
1451    << getFunctionNumber() << '_' << CPID;
1452  return OutContext.GetOrCreateSymbol(Name.str());
1453}
1454
1455/// GetJTISymbol - Return the symbol for the specified jump table entry.
1456MCSymbol *AsmPrinter::GetJTISymbol(unsigned JTID, bool isLinkerPrivate) const {
1457  return MF->getJTISymbol(JTID, OutContext, isLinkerPrivate);
1458}
1459
1460/// GetJTSetSymbol - Return the symbol for the specified jump table .set
1461/// FIXME: privatize to AsmPrinter.
1462MCSymbol *AsmPrinter::GetJTSetSymbol(unsigned UID, unsigned MBBID) const {
1463  SmallString<60> Name;
1464  raw_svector_ostream(Name) << MAI->getPrivateGlobalPrefix()
1465    << getFunctionNumber() << '_' << UID << "_set_" << MBBID;
1466  return OutContext.GetOrCreateSymbol(Name.str());
1467}
1468
1469/// GetGlobalValueSymbol - Return the MCSymbol for the specified global
1470/// value.
1471MCSymbol *AsmPrinter::GetGlobalValueSymbol(const GlobalValue *GV) const {
1472  SmallString<60> NameStr;
1473  Mang->getNameWithPrefix(NameStr, GV, false);
1474  return OutContext.GetOrCreateSymbol(NameStr.str());
1475}
1476
1477/// GetSymbolWithGlobalValueBase - Return the MCSymbol for a symbol with
1478/// global value name as its base, with the specified suffix, and where the
1479/// symbol is forced to have private linkage if ForcePrivate is true.
1480MCSymbol *AsmPrinter::GetSymbolWithGlobalValueBase(const GlobalValue *GV,
1481                                                   StringRef Suffix,
1482                                                   bool ForcePrivate) const {
1483  SmallString<60> NameStr;
1484  Mang->getNameWithPrefix(NameStr, GV, ForcePrivate);
1485  NameStr.append(Suffix.begin(), Suffix.end());
1486  return OutContext.GetOrCreateSymbol(NameStr.str());
1487}
1488
1489/// GetExternalSymbolSymbol - Return the MCSymbol for the specified
1490/// ExternalSymbol.
1491MCSymbol *AsmPrinter::GetExternalSymbolSymbol(StringRef Sym) const {
1492  SmallString<60> NameStr;
1493  Mang->getNameWithPrefix(NameStr, Sym);
1494  return OutContext.GetOrCreateSymbol(NameStr.str());
1495}
1496
1497
1498
1499/// PrintParentLoopComment - Print comments about parent loops of this one.
1500static void PrintParentLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1501                                   unsigned FunctionNumber) {
1502  if (Loop == 0) return;
1503  PrintParentLoopComment(OS, Loop->getParentLoop(), FunctionNumber);
1504  OS.indent(Loop->getLoopDepth()*2)
1505    << "Parent Loop BB" << FunctionNumber << "_"
1506    << Loop->getHeader()->getNumber()
1507    << " Depth=" << Loop->getLoopDepth() << '\n';
1508}
1509
1510
1511/// PrintChildLoopComment - Print comments about child loops within
1512/// the loop for this basic block, with nesting.
1513static void PrintChildLoopComment(raw_ostream &OS, const MachineLoop *Loop,
1514                                  unsigned FunctionNumber) {
1515  // Add child loop information
1516  for (MachineLoop::iterator CL = Loop->begin(), E = Loop->end();CL != E; ++CL){
1517    OS.indent((*CL)->getLoopDepth()*2)
1518      << "Child Loop BB" << FunctionNumber << "_"
1519      << (*CL)->getHeader()->getNumber() << " Depth " << (*CL)->getLoopDepth()
1520      << '\n';
1521    PrintChildLoopComment(OS, *CL, FunctionNumber);
1522  }
1523}
1524
1525/// EmitComments - Pretty-print comments for basic blocks.
1526static void PrintBasicBlockLoopComments(const MachineBasicBlock &MBB,
1527                                        const MachineLoopInfo *LI,
1528                                        const AsmPrinter &AP) {
1529  // Add loop depth information
1530  const MachineLoop *Loop = LI->getLoopFor(&MBB);
1531  if (Loop == 0) return;
1532
1533  MachineBasicBlock *Header = Loop->getHeader();
1534  assert(Header && "No header for loop");
1535
1536  // If this block is not a loop header, just print out what is the loop header
1537  // and return.
1538  if (Header != &MBB) {
1539    AP.OutStreamer.AddComment("  in Loop: Header=BB" +
1540                              Twine(AP.getFunctionNumber())+"_" +
1541                              Twine(Loop->getHeader()->getNumber())+
1542                              " Depth="+Twine(Loop->getLoopDepth()));
1543    return;
1544  }
1545
1546  // Otherwise, it is a loop header.  Print out information about child and
1547  // parent loops.
1548  raw_ostream &OS = AP.OutStreamer.GetCommentOS();
1549
1550  PrintParentLoopComment(OS, Loop->getParentLoop(), AP.getFunctionNumber());
1551
1552  OS << "=>";
1553  OS.indent(Loop->getLoopDepth()*2-2);
1554
1555  OS << "This ";
1556  if (Loop->empty())
1557    OS << "Inner ";
1558  OS << "Loop Header: Depth=" + Twine(Loop->getLoopDepth()) << '\n';
1559
1560  PrintChildLoopComment(OS, Loop, AP.getFunctionNumber());
1561}
1562
1563
1564/// EmitBasicBlockStart - This method prints the label for the specified
1565/// MachineBasicBlock, an alignment (if present) and a comment describing
1566/// it if appropriate.
1567void AsmPrinter::EmitBasicBlockStart(const MachineBasicBlock *MBB) const {
1568  // Emit an alignment directive for this block, if needed.
1569  if (unsigned Align = MBB->getAlignment())
1570    EmitAlignment(Log2_32(Align));
1571
1572  // If the block has its address taken, emit a special label to satisfy
1573  // references to the block. This is done so that we don't need to
1574  // remember the number of this label, and so that we can make
1575  // forward references to labels without knowing what their numbers
1576  // will be.
1577  if (MBB->hasAddressTaken()) {
1578    const BasicBlock *BB = MBB->getBasicBlock();
1579    if (VerboseAsm)
1580      OutStreamer.AddComment("Address Taken");
1581    OutStreamer.EmitLabel(GetBlockAddressSymbol(BB->getParent(), BB));
1582  }
1583
1584  // Print the main label for the block.
1585  if (MBB->pred_empty() || MBB->isOnlyReachableByFallthrough()) {
1586    if (VerboseAsm) {
1587      // NOTE: Want this comment at start of line.
1588      O << MAI->getCommentString() << " BB#" << MBB->getNumber() << ':';
1589      if (const BasicBlock *BB = MBB->getBasicBlock())
1590        if (BB->hasName())
1591          OutStreamer.AddComment("%" + BB->getName());
1592
1593      PrintBasicBlockLoopComments(*MBB, LI, *this);
1594      OutStreamer.AddBlankLine();
1595    }
1596  } else {
1597    if (VerboseAsm) {
1598      if (const BasicBlock *BB = MBB->getBasicBlock())
1599        if (BB->hasName())
1600          OutStreamer.AddComment("%" + BB->getName());
1601      PrintBasicBlockLoopComments(*MBB, LI, *this);
1602    }
1603
1604    OutStreamer.EmitLabel(MBB->getSymbol(OutContext));
1605  }
1606}
1607
1608void AsmPrinter::printVisibility(MCSymbol *Sym, unsigned Visibility) const {
1609  // FIXME: RENAME TO EmitVisibility.
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