AsmPrinter.cpp revision 946b521498866b3d83c4447c9c0ece6095a56874 
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/GCMetadataPrinter.h"
20#include "llvm/CodeGen/MachineConstantPool.h"
21#include "llvm/CodeGen/MachineFunction.h"
22#include "llvm/CodeGen/MachineJumpTableInfo.h"
23#include "llvm/CodeGen/MachineLoopInfo.h"
24#include "llvm/CodeGen/MachineModuleInfo.h"
25#include "llvm/CodeGen/DwarfWriter.h"
26#include "llvm/Analysis/DebugInfo.h"
27#include "llvm/MC/MCContext.h"
28#include "llvm/MC/MCInst.h"
29#include "llvm/MC/MCSection.h"
30#include "llvm/MC/MCStreamer.h"
31#include "llvm/Support/CommandLine.h"
32#include "llvm/Support/ErrorHandling.h"
33#include "llvm/Support/FormattedStream.h"
34#include "llvm/Support/Mangler.h"
35#include "llvm/MC/MCAsmInfo.h"
36#include "llvm/Target/TargetData.h"
37#include "llvm/Target/TargetLowering.h"
38#include "llvm/Target/TargetLoweringObjectFile.h"
39#include "llvm/Target/TargetOptions.h"
40#include "llvm/Target/TargetRegisterInfo.h"
41#include "llvm/ADT/SmallPtrSet.h"
42#include "llvm/ADT/SmallString.h"
43#include "llvm/ADT/StringExtras.h"
44#include <cerrno>
45using namespace llvm;
46
47static cl::opt<cl::boolOrDefault>
48AsmVerbose("asm-verbose", cl::desc("Add comments to directives."),
49           cl::init(cl::BOU_UNSET));
50
51char AsmPrinter::ID = 0;
52AsmPrinter::AsmPrinter(formatted_raw_ostream &o, TargetMachine &tm,
53                       const MCAsmInfo *T, bool VDef)
54  : MachineFunctionPass(&ID), FunctionNumber(0), O(o),
55    TM(tm), MAI(T), TRI(tm.getRegisterInfo()),
56
57    OutContext(*new MCContext()),
58    OutStreamer(*createAsmStreamer(OutContext, O, *T, this)),
59
60    LastMI(0), LastFn(0), Counter(~0U),
61    PrevDLT(0, ~0U, ~0U) {
62  DW = 0; MMI = 0;
63  switch (AsmVerbose) {
64  case cl::BOU_UNSET: VerboseAsm = VDef;  break;
65  case cl::BOU_TRUE:  VerboseAsm = true;  break;
66  case cl::BOU_FALSE: VerboseAsm = false; break;
67  }
68}
69
70AsmPrinter::~AsmPrinter() {
71  for (gcp_iterator I = GCMetadataPrinters.begin(),
72                    E = GCMetadataPrinters.end(); I != E; ++I)
73    delete I->second;
74
75  delete &OutStreamer;
76  delete &OutContext;
77}
78
79TargetLoweringObjectFile &AsmPrinter::getObjFileLowering() const {
80  return TM.getTargetLowering()->getObjFileLowering();
81}
82
83/// getCurrentSection() - Return the current section we are emitting to.
84const MCSection *AsmPrinter::getCurrentSection() const {
85  return OutStreamer.getCurrentSection();
86}
87
88
89void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
90  AU.setPreservesAll();
91  MachineFunctionPass::getAnalysisUsage(AU);
92  AU.addRequired<GCModuleInfo>();
93  if (VerboseAsm)
94    AU.addRequired<MachineLoopInfo>();
95}
96
97bool AsmPrinter::doInitialization(Module &M) {
98  // Initialize TargetLoweringObjectFile.
99  const_cast<TargetLoweringObjectFile&>(getObjFileLowering())
100    .Initialize(OutContext, TM);
101
102  Mang = new Mangler(M, MAI->getGlobalPrefix(), MAI->getPrivateGlobalPrefix(),
103                     MAI->getLinkerPrivateGlobalPrefix());
104
105  if (MAI->doesAllowQuotesInName())
106    Mang->setUseQuotes(true);
107
108  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
109  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
110
111  if (MAI->hasSingleParameterDotFile()) {
112    /* Very minimal debug info. It is ignored if we emit actual
113       debug info. If we don't, this at helps the user find where
114       a function came from. */
115    O << "\t.file\t\"" << M.getModuleIdentifier() << "\"\n";
116  }
117
118  for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
119    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
120      MP->beginAssembly(O, *this, *MAI);
121
122  if (!M.getModuleInlineAsm().empty())
123    O << MAI->getCommentString() << " Start of file scope inline assembly\n"
124      << M.getModuleInlineAsm()
125      << '\n' << MAI->getCommentString()
126      << " End of file scope inline assembly\n";
127
128  if (MAI->doesSupportDebugInformation() ||
129      MAI->doesSupportExceptionHandling()) {
130    MMI = getAnalysisIfAvailable<MachineModuleInfo>();
131    if (MMI)
132      MMI->AnalyzeModule(M);
133    DW = getAnalysisIfAvailable<DwarfWriter>();
134    if (DW)
135      DW->BeginModule(&M, MMI, O, this, MAI);
136  }
137
138  return false;
139}
140
141bool AsmPrinter::doFinalization(Module &M) {
142  // Emit global variables.
143  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
144       I != E; ++I)
145    PrintGlobalVariable(I);
146
147  // Emit final debug information.
148  if (MAI->doesSupportDebugInformation() || MAI->doesSupportExceptionHandling())
149    DW->EndModule();
150
151  // If the target wants to know about weak references, print them all.
152  if (MAI->getWeakRefDirective()) {
153    // FIXME: This is not lazy, it would be nice to only print weak references
154    // to stuff that is actually used.  Note that doing so would require targets
155    // to notice uses in operands (due to constant exprs etc).  This should
156    // happen with the MC stuff eventually.
157
158    // Print out module-level global variables here.
159    for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
160         I != E; ++I) {
161      if (I->hasExternalWeakLinkage())
162        O << MAI->getWeakRefDirective() << Mang->getMangledName(I) << '\n';
163    }
164
165    for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I) {
166      if (I->hasExternalWeakLinkage())
167        O << MAI->getWeakRefDirective() << Mang->getMangledName(I) << '\n';
168    }
169  }
170
171  if (MAI->getSetDirective()) {
172    O << '\n';
173    for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
174         I != E; ++I) {
175      std::string Name = Mang->getMangledName(I);
176
177      const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
178      std::string Target = Mang->getMangledName(GV);
179
180      if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
181        O << "\t.globl\t" << Name << '\n';
182      else if (I->hasWeakLinkage())
183        O << MAI->getWeakRefDirective() << Name << '\n';
184      else if (!I->hasLocalLinkage())
185        llvm_unreachable("Invalid alias linkage");
186
187      printVisibility(Name, I->getVisibility());
188
189      O << MAI->getSetDirective() << ' ' << Name << ", " << Target << '\n';
190    }
191  }
192
193  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
194  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
195  for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
196    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
197      MP->finishAssembly(O, *this, *MAI);
198
199  // If we don't have any trampolines, then we don't require stack memory
200  // to be executable. Some targets have a directive to declare this.
201  Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
202  if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
203    if (MAI->getNonexecutableStackDirective())
204      O << MAI->getNonexecutableStackDirective() << '\n';
205
206  delete Mang; Mang = 0;
207  DW = 0; MMI = 0;
208
209  OutStreamer.Finish();
210  return false;
211}
212
213std::string
214AsmPrinter::getCurrentFunctionEHName(const MachineFunction *MF) const {
215  assert(MF && "No machine function?");
216  return Mang->getMangledName(MF->getFunction(), ".eh",
217                              MAI->is_EHSymbolPrivate());
218}
219
220void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
221  // What's my mangled name?
222  CurrentFnName = Mang->getMangledName(MF.getFunction());
223  IncrementFunctionNumber();
224
225  if (VerboseAsm) {
226    LI = &getAnalysis<MachineLoopInfo>();
227  }
228}
229
230namespace {
231  // SectionCPs - Keep track the alignment, constpool entries per Section.
232  struct SectionCPs {
233    const MCSection *S;
234    unsigned Alignment;
235    SmallVector<unsigned, 4> CPEs;
236    SectionCPs(const MCSection *s, unsigned a) : S(s), Alignment(a) {};
237  };
238}
239
240/// EmitConstantPool - Print to the current output stream assembly
241/// representations of the constants in the constant pool MCP. This is
242/// used to print out constants which have been "spilled to memory" by
243/// the code generator.
244///
245void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
246  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
247  if (CP.empty()) return;
248
249  // Calculate sections for constant pool entries. We collect entries to go into
250  // the same section together to reduce amount of section switch statements.
251  SmallVector<SectionCPs, 4> CPSections;
252  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
253    const MachineConstantPoolEntry &CPE = CP[i];
254    unsigned Align = CPE.getAlignment();
255
256    SectionKind Kind;
257    switch (CPE.getRelocationInfo()) {
258    default: llvm_unreachable("Unknown section kind");
259    case 2: Kind = SectionKind::getReadOnlyWithRel(); break;
260    case 1:
261      Kind = SectionKind::getReadOnlyWithRelLocal();
262      break;
263    case 0:
264    switch (TM.getTargetData()->getTypeAllocSize(CPE.getType())) {
265    case 4:  Kind = SectionKind::getMergeableConst4(); break;
266    case 8:  Kind = SectionKind::getMergeableConst8(); break;
267    case 16: Kind = SectionKind::getMergeableConst16();break;
268    default: Kind = SectionKind::getMergeableConst(); break;
269    }
270    }
271
272    const MCSection *S = getObjFileLowering().getSectionForConstant(Kind);
273
274    // The number of sections are small, just do a linear search from the
275    // last section to the first.
276    bool Found = false;
277    unsigned SecIdx = CPSections.size();
278    while (SecIdx != 0) {
279      if (CPSections[--SecIdx].S == S) {
280        Found = true;
281        break;
282      }
283    }
284    if (!Found) {
285      SecIdx = CPSections.size();
286      CPSections.push_back(SectionCPs(S, Align));
287    }
288
289    if (Align > CPSections[SecIdx].Alignment)
290      CPSections[SecIdx].Alignment = Align;
291    CPSections[SecIdx].CPEs.push_back(i);
292  }
293
294  // Now print stuff into the calculated sections.
295  for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
296    OutStreamer.SwitchSection(CPSections[i].S);
297    EmitAlignment(Log2_32(CPSections[i].Alignment));
298
299    unsigned Offset = 0;
300    for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
301      unsigned CPI = CPSections[i].CPEs[j];
302      MachineConstantPoolEntry CPE = CP[CPI];
303
304      // Emit inter-object padding for alignment.
305      unsigned AlignMask = CPE.getAlignment() - 1;
306      unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
307      EmitZeros(NewOffset - Offset);
308
309      const Type *Ty = CPE.getType();
310      Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
311
312      O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
313        << CPI << ':';
314      if (VerboseAsm) {
315        O.PadToColumn(MAI->getCommentColumn());
316        O << MAI->getCommentString() << " constant ";
317        WriteTypeSymbolic(O, CPE.getType(), MF->getFunction()->getParent());
318      }
319      O << '\n';
320      if (CPE.isMachineConstantPoolEntry())
321        EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
322      else
323        EmitGlobalConstant(CPE.Val.ConstVal);
324    }
325  }
326}
327
328/// EmitJumpTableInfo - Print assembly representations of the jump tables used
329/// by the current function to the current output stream.
330///
331void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
332                                   MachineFunction &MF) {
333  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
334  if (JT.empty()) return;
335
336  bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
337
338  // Pick the directive to use to print the jump table entries, and switch to
339  // the appropriate section.
340  TargetLowering *LoweringInfo = TM.getTargetLowering();
341
342  const Function *F = MF.getFunction();
343  bool JTInDiffSection = false;
344  if (F->isWeakForLinker() ||
345      (IsPic && !LoweringInfo->usesGlobalOffsetTable())) {
346    // In PIC mode, we need to emit the jump table to the same section as the
347    // function body itself, otherwise the label differences won't make sense.
348    // We should also do if the section name is NULL or function is declared in
349    // discardable section.
350    OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang,
351                                                                    TM));
352  } else {
353    // Otherwise, drop it in the readonly section.
354    const MCSection *ReadOnlySection =
355      getObjFileLowering().getSectionForConstant(SectionKind::getReadOnly());
356    OutStreamer.SwitchSection(ReadOnlySection);
357    JTInDiffSection = true;
358  }
359
360  EmitAlignment(Log2_32(MJTI->getAlignment()));
361
362  for (unsigned i = 0, e = JT.size(); i != e; ++i) {
363    const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
364
365    // If this jump table was deleted, ignore it.
366    if (JTBBs.empty()) continue;
367
368    // For PIC codegen, if possible we want to use the SetDirective to reduce
369    // the number of relocations the assembler will generate for the jump table.
370    // Set directives are all printed before the jump table itself.
371    SmallPtrSet<MachineBasicBlock*, 16> EmittedSets;
372    if (MAI->getSetDirective() && IsPic)
373      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
374        if (EmittedSets.insert(JTBBs[ii]))
375          printPICJumpTableSetLabel(i, JTBBs[ii]);
376
377    // On some targets (e.g. darwin) we want to emit two consequtive labels
378    // before each jump table.  The first label is never referenced, but tells
379    // the assembler and linker the extents of the jump table object.  The
380    // second label is actually referenced by the code.
381    if (JTInDiffSection) {
382      if (const char *JTLabelPrefix = MAI->getJumpTableSpecialLabelPrefix())
383        O << JTLabelPrefix << "JTI" << getFunctionNumber() << '_' << i << ":\n";
384    }
385
386    O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
387      << '_' << i << ":\n";
388
389    for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
390      printPICJumpTableEntry(MJTI, JTBBs[ii], i);
391      O << '\n';
392    }
393  }
394}
395
396void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
397                                        const MachineBasicBlock *MBB,
398                                        unsigned uid)  const {
399  bool isPIC = TM.getRelocationModel() == Reloc::PIC_;
400
401  // Use JumpTableDirective otherwise honor the entry size from the jump table
402  // info.
403  const char *JTEntryDirective = MAI->getJumpTableDirective(isPIC);
404  bool HadJTEntryDirective = JTEntryDirective != NULL;
405  if (!HadJTEntryDirective) {
406    JTEntryDirective = MJTI->getEntrySize() == 4 ?
407      MAI->getData32bitsDirective() : MAI->getData64bitsDirective();
408  }
409
410  O << JTEntryDirective << ' ';
411
412  // If we have emitted set directives for the jump table entries, print
413  // them rather than the entries themselves.  If we're emitting PIC, then
414  // emit the table entries as differences between two text section labels.
415  // If we're emitting non-PIC code, then emit the entries as direct
416  // references to the target basic blocks.
417  if (!isPIC) {
418    printBasicBlockLabel(MBB, false, false, false);
419  } else if (MAI->getSetDirective()) {
420    O << MAI->getPrivateGlobalPrefix() << getFunctionNumber()
421      << '_' << uid << "_set_" << MBB->getNumber();
422  } else {
423    printBasicBlockLabel(MBB, false, false, false);
424    // If the arch uses custom Jump Table directives, don't calc relative to
425    // JT
426    if (!HadJTEntryDirective)
427      O << '-' << MAI->getPrivateGlobalPrefix() << "JTI"
428        << getFunctionNumber() << '_' << uid;
429  }
430}
431
432
433/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
434/// special global used by LLVM.  If so, emit it and return true, otherwise
435/// do nothing and return false.
436bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
437  if (GV->getName() == "llvm.used") {
438    if (MAI->getUsedDirective() != 0)    // No need to emit this at all.
439      EmitLLVMUsedList(GV->getInitializer());
440    return true;
441  }
442
443  // Ignore debug and non-emitted data.  This handles llvm.compiler.used.
444  if (GV->getSection() == "llvm.metadata" ||
445      GV->hasAvailableExternallyLinkage())
446    return true;
447
448  if (!GV->hasAppendingLinkage()) return false;
449
450  assert(GV->hasInitializer() && "Not a special LLVM global!");
451
452  const TargetData *TD = TM.getTargetData();
453  unsigned Align = Log2_32(TD->getPointerPrefAlignment());
454  if (GV->getName() == "llvm.global_ctors") {
455    OutStreamer.SwitchSection(getObjFileLowering().getStaticCtorSection());
456    EmitAlignment(Align, 0);
457    EmitXXStructorList(GV->getInitializer());
458    return true;
459  }
460
461  if (GV->getName() == "llvm.global_dtors") {
462    OutStreamer.SwitchSection(getObjFileLowering().getStaticDtorSection());
463    EmitAlignment(Align, 0);
464    EmitXXStructorList(GV->getInitializer());
465    return true;
466  }
467
468  return false;
469}
470
471/// EmitLLVMUsedList - For targets that define a MAI::UsedDirective, mark each
472/// global in the specified llvm.used list for which emitUsedDirectiveFor
473/// is true, as being used with this directive.
474void AsmPrinter::EmitLLVMUsedList(Constant *List) {
475  const char *Directive = MAI->getUsedDirective();
476
477  // Should be an array of 'i8*'.
478  ConstantArray *InitList = dyn_cast<ConstantArray>(List);
479  if (InitList == 0) return;
480
481  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
482    const GlobalValue *GV =
483      dyn_cast<GlobalValue>(InitList->getOperand(i)->stripPointerCasts());
484    if (GV && getObjFileLowering().shouldEmitUsedDirectiveFor(GV, Mang)) {
485      O << Directive;
486      EmitConstantValueOnly(InitList->getOperand(i));
487      O << '\n';
488    }
489  }
490}
491
492/// EmitXXStructorList - Emit the ctor or dtor list.  This just prints out the
493/// function pointers, ignoring the init priority.
494void AsmPrinter::EmitXXStructorList(Constant *List) {
495  // Should be an array of '{ int, void ()* }' structs.  The first value is the
496  // init priority, which we ignore.
497  if (!isa<ConstantArray>(List)) return;
498  ConstantArray *InitList = cast<ConstantArray>(List);
499  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
500    if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
501      if (CS->getNumOperands() != 2) return;  // Not array of 2-element structs.
502
503      if (CS->getOperand(1)->isNullValue())
504        return;  // Found a null terminator, exit printing.
505      // Emit the function pointer.
506      EmitGlobalConstant(CS->getOperand(1));
507    }
508}
509
510/// getGlobalLinkName - Returns the asm/link name of of the specified
511/// global variable.  Should be overridden by each target asm printer to
512/// generate the appropriate value.
513const std::string &AsmPrinter::getGlobalLinkName(const GlobalVariable *GV,
514                                                 std::string &LinkName) const {
515  if (isa<Function>(GV)) {
516    LinkName += MAI->getFunctionAddrPrefix();
517    LinkName += Mang->getMangledName(GV);
518    LinkName += MAI->getFunctionAddrSuffix();
519  } else {
520    LinkName += MAI->getGlobalVarAddrPrefix();
521    LinkName += Mang->getMangledName(GV);
522    LinkName += MAI->getGlobalVarAddrSuffix();
523  }
524
525  return LinkName;
526}
527
528/// EmitExternalGlobal - Emit the external reference to a global variable.
529/// Should be overridden if an indirect reference should be used.
530void AsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) {
531  std::string GLN;
532  O << getGlobalLinkName(GV, GLN);
533}
534
535
536
537//===----------------------------------------------------------------------===//
538/// LEB 128 number encoding.
539
540/// PrintULEB128 - Print a series of hexidecimal values (separated by commas)
541/// representing an unsigned leb128 value.
542void AsmPrinter::PrintULEB128(unsigned Value) const {
543  char Buffer[20];
544  do {
545    unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
546    Value >>= 7;
547    if (Value) Byte |= 0x80;
548    O << "0x" << utohex_buffer(Byte, Buffer+20);
549    if (Value) O << ", ";
550  } while (Value);
551}
552
553/// PrintSLEB128 - Print a series of hexidecimal values (separated by commas)
554/// representing a signed leb128 value.
555void AsmPrinter::PrintSLEB128(int Value) const {
556  int Sign = Value >> (8 * sizeof(Value) - 1);
557  bool IsMore;
558  char Buffer[20];
559
560  do {
561    unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
562    Value >>= 7;
563    IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
564    if (IsMore) Byte |= 0x80;
565    O << "0x" << utohex_buffer(Byte, Buffer+20);
566    if (IsMore) O << ", ";
567  } while (IsMore);
568}
569
570//===--------------------------------------------------------------------===//
571// Emission and print routines
572//
573
574/// PrintHex - Print a value as a hexidecimal value.
575///
576void AsmPrinter::PrintHex(int Value) const {
577  char Buffer[20];
578  O << "0x" << utohex_buffer(static_cast<unsigned>(Value), Buffer+20);
579}
580
581/// EOL - Print a newline character to asm stream.  If a comment is present
582/// then it will be printed first.  Comments should not contain '\n'.
583void AsmPrinter::EOL() const {
584  O << '\n';
585}
586
587void AsmPrinter::EOL(const std::string &Comment) const {
588  if (VerboseAsm && !Comment.empty()) {
589    O.PadToColumn(MAI->getCommentColumn());
590    O << MAI->getCommentString()
591      << ' '
592      << Comment;
593  }
594  O << '\n';
595}
596
597void AsmPrinter::EOL(const char* Comment) const {
598  if (VerboseAsm && *Comment) {
599    O.PadToColumn(MAI->getCommentColumn());
600    O << MAI->getCommentString()
601      << ' '
602      << Comment;
603  }
604  O << '\n';
605}
606
607static const char *DecodeDWARFEncoding(unsigned Encoding) {
608  switch (Encoding) {
609  case dwarf::DW_EH_PE_absptr:
610    return "absptr";
611  case dwarf::DW_EH_PE_omit:
612    return "omit";
613  case dwarf::DW_EH_PE_pcrel:
614    return "pcrel";
615  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4:
616    return "pcrel udata4";
617  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4:
618    return "pcrel sdata4";
619  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8:
620    return "pcrel udata8";
621  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8:
622    return "pcrel sdata8";
623  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata4:
624    return "indirect pcrel udata4";
625  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata4:
626    return "indirect pcrel sdata4";
627  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata8:
628    return "indirect pcrel udata8";
629  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata8:
630    return "indirect pcrel sdata8";
631  }
632
633  return 0;
634}
635
636void AsmPrinter::EOL(const std::string &Comment, unsigned Encoding) const {
637  if (VerboseAsm && !Comment.empty()) {
638    EOL(Comment.c_str(), Encoding);
639    return;
640  }
641  O << '\n';
642}
643
644void AsmPrinter::EOL(const char *Comment, unsigned Encoding) const {
645  if (VerboseAsm && *Comment) {
646    O.PadToColumn(MAI->getCommentColumn());
647    O << MAI->getCommentString()
648      << ' '
649      << Comment;
650
651    if (const char *EncStr = DecodeDWARFEncoding(Encoding))
652      O << " (" << EncStr << ')';
653  }
654  O << '\n';
655}
656
657/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
658/// unsigned leb128 value.
659void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
660  if (MAI->hasLEB128()) {
661    O << "\t.uleb128\t"
662      << Value;
663  } else {
664    O << MAI->getData8bitsDirective();
665    PrintULEB128(Value);
666  }
667}
668
669/// EmitSLEB128Bytes - print an assembler byte data directive to compose a
670/// signed leb128 value.
671void AsmPrinter::EmitSLEB128Bytes(int Value) const {
672  if (MAI->hasLEB128()) {
673    O << "\t.sleb128\t"
674      << Value;
675  } else {
676    O << MAI->getData8bitsDirective();
677    PrintSLEB128(Value);
678  }
679}
680
681/// EmitInt8 - Emit a byte directive and value.
682///
683void AsmPrinter::EmitInt8(int Value) const {
684  O << MAI->getData8bitsDirective();
685  PrintHex(Value & 0xFF);
686}
687
688/// EmitInt16 - Emit a short directive and value.
689///
690void AsmPrinter::EmitInt16(int Value) const {
691  O << MAI->getData16bitsDirective();
692  PrintHex(Value & 0xFFFF);
693}
694
695/// EmitInt32 - Emit a long directive and value.
696///
697void AsmPrinter::EmitInt32(int Value) const {
698  O << MAI->getData32bitsDirective();
699  PrintHex(Value);
700}
701
702/// EmitInt64 - Emit a long long directive and value.
703///
704void AsmPrinter::EmitInt64(uint64_t Value) const {
705  if (MAI->getData64bitsDirective()) {
706    O << MAI->getData64bitsDirective();
707    PrintHex(Value);
708  } else {
709    if (TM.getTargetData()->isBigEndian()) {
710      EmitInt32(unsigned(Value >> 32)); O << '\n';
711      EmitInt32(unsigned(Value));
712    } else {
713      EmitInt32(unsigned(Value)); O << '\n';
714      EmitInt32(unsigned(Value >> 32));
715    }
716  }
717}
718
719/// toOctal - Convert the low order bits of X into an octal digit.
720///
721static inline char toOctal(int X) {
722  return (X&7)+'0';
723}
724
725/// printStringChar - Print a char, escaped if necessary.
726///
727static void printStringChar(formatted_raw_ostream &O, unsigned char C) {
728  if (C == '"') {
729    O << "\\\"";
730  } else if (C == '\\') {
731    O << "\\\\";
732  } else if (isprint((unsigned char)C)) {
733    O << C;
734  } else {
735    switch(C) {
736    case '\b': O << "\\b"; break;
737    case '\f': O << "\\f"; break;
738    case '\n': O << "\\n"; break;
739    case '\r': O << "\\r"; break;
740    case '\t': O << "\\t"; break;
741    default:
742      O << '\\';
743      O << toOctal(C >> 6);
744      O << toOctal(C >> 3);
745      O << toOctal(C >> 0);
746      break;
747    }
748  }
749}
750
751/// EmitString - Emit a string with quotes and a null terminator.
752/// Special characters are emitted properly.
753/// \literal (Eg. '\t') \endliteral
754void AsmPrinter::EmitString(const std::string &String) const {
755  EmitString(String.c_str(), String.size());
756}
757
758void AsmPrinter::EmitString(const char *String, unsigned Size) const {
759  const char* AscizDirective = MAI->getAscizDirective();
760  if (AscizDirective)
761    O << AscizDirective;
762  else
763    O << MAI->getAsciiDirective();
764  O << '\"';
765  for (unsigned i = 0; i < Size; ++i)
766    printStringChar(O, String[i]);
767  if (AscizDirective)
768    O << '\"';
769  else
770    O << "\\0\"";
771}
772
773
774/// EmitFile - Emit a .file directive.
775void AsmPrinter::EmitFile(unsigned Number, const std::string &Name) const {
776  O << "\t.file\t" << Number << " \"";
777  for (unsigned i = 0, N = Name.size(); i < N; ++i)
778    printStringChar(O, Name[i]);
779  O << '\"';
780}
781
782
783//===----------------------------------------------------------------------===//
784
785// EmitAlignment - Emit an alignment directive to the specified power of
786// two boundary.  For example, if you pass in 3 here, you will get an 8
787// byte alignment.  If a global value is specified, and if that global has
788// an explicit alignment requested, it will unconditionally override the
789// alignment request.  However, if ForcedAlignBits is specified, this value
790// has final say: the ultimate alignment will be the max of ForcedAlignBits
791// and the alignment computed with NumBits and the global.
792//
793// The algorithm is:
794//     Align = NumBits;
795//     if (GV && GV->hasalignment) Align = GV->getalignment();
796//     Align = std::max(Align, ForcedAlignBits);
797//
798void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
799                               unsigned ForcedAlignBits,
800                               bool UseFillExpr) const {
801  if (GV && GV->getAlignment())
802    NumBits = Log2_32(GV->getAlignment());
803  NumBits = std::max(NumBits, ForcedAlignBits);
804
805  if (NumBits == 0) return;   // No need to emit alignment.
806
807  unsigned FillValue = 0;
808  if (getCurrentSection()->getKind().isText())
809    FillValue = MAI->getTextAlignFillValue();
810
811  OutStreamer.EmitValueToAlignment(1 << NumBits, FillValue, 1, 0);
812}
813
814/// EmitZeros - Emit a block of zeros.
815///
816void AsmPrinter::EmitZeros(uint64_t NumZeros, unsigned AddrSpace) const {
817  if (NumZeros) {
818    if (MAI->getZeroDirective()) {
819      O << MAI->getZeroDirective() << NumZeros;
820      if (MAI->getZeroDirectiveSuffix())
821        O << MAI->getZeroDirectiveSuffix();
822      O << '\n';
823    } else {
824      for (; NumZeros; --NumZeros)
825        O << MAI->getData8bitsDirective(AddrSpace) << "0\n";
826    }
827  }
828}
829
830// Print out the specified constant, without a storage class.  Only the
831// constants valid in constant expressions can occur here.
832void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
833  if (CV->isNullValue() || isa<UndefValue>(CV))
834    O << '0';
835  else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
836    O << CI->getZExtValue();
837  } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
838    // This is a constant address for a global variable or function. Use the
839    // name of the variable or function as the address value, possibly
840    // decorating it with GlobalVarAddrPrefix/Suffix or
841    // FunctionAddrPrefix/Suffix (these all default to "" )
842    if (isa<Function>(GV)) {
843      O << MAI->getFunctionAddrPrefix()
844        << Mang->getMangledName(GV)
845        << MAI->getFunctionAddrSuffix();
846    } else {
847      O << MAI->getGlobalVarAddrPrefix()
848        << Mang->getMangledName(GV)
849        << MAI->getGlobalVarAddrSuffix();
850    }
851  } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
852    const TargetData *TD = TM.getTargetData();
853    unsigned Opcode = CE->getOpcode();
854    switch (Opcode) {
855    case Instruction::Trunc:
856    case Instruction::ZExt:
857    case Instruction::SExt:
858    case Instruction::FPTrunc:
859    case Instruction::FPExt:
860    case Instruction::UIToFP:
861    case Instruction::SIToFP:
862    case Instruction::FPToUI:
863    case Instruction::FPToSI:
864      llvm_unreachable("FIXME: Don't support this constant cast expr");
865    case Instruction::GetElementPtr: {
866      // generate a symbolic expression for the byte address
867      const Constant *ptrVal = CE->getOperand(0);
868      SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
869      if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
870                                                idxVec.size())) {
871        // Truncate/sext the offset to the pointer size.
872        if (TD->getPointerSizeInBits() != 64) {
873          int SExtAmount = 64-TD->getPointerSizeInBits();
874          Offset = (Offset << SExtAmount) >> SExtAmount;
875        }
876
877        if (Offset)
878          O << '(';
879        EmitConstantValueOnly(ptrVal);
880        if (Offset > 0)
881          O << ") + " << Offset;
882        else if (Offset < 0)
883          O << ") - " << -Offset;
884      } else {
885        EmitConstantValueOnly(ptrVal);
886      }
887      break;
888    }
889    case Instruction::BitCast:
890      return EmitConstantValueOnly(CE->getOperand(0));
891
892    case Instruction::IntToPtr: {
893      // Handle casts to pointers by changing them into casts to the appropriate
894      // integer type.  This promotes constant folding and simplifies this code.
895      Constant *Op = CE->getOperand(0);
896      Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(CV->getContext()),
897                                        false/*ZExt*/);
898      return EmitConstantValueOnly(Op);
899    }
900
901
902    case Instruction::PtrToInt: {
903      // Support only foldable casts to/from pointers that can be eliminated by
904      // changing the pointer to the appropriately sized integer type.
905      Constant *Op = CE->getOperand(0);
906      const Type *Ty = CE->getType();
907
908      // We can emit the pointer value into this slot if the slot is an
909      // integer slot greater or equal to the size of the pointer.
910      if (TD->getTypeAllocSize(Ty) == TD->getTypeAllocSize(Op->getType()))
911        return EmitConstantValueOnly(Op);
912
913      O << "((";
914      EmitConstantValueOnly(Op);
915      APInt ptrMask =
916        APInt::getAllOnesValue(TD->getTypeAllocSizeInBits(Op->getType()));
917
918      SmallString<40> S;
919      ptrMask.toStringUnsigned(S);
920      O << ") & " << S.str() << ')';
921      break;
922    }
923    case Instruction::Add:
924    case Instruction::Sub:
925    case Instruction::And:
926    case Instruction::Or:
927    case Instruction::Xor:
928      O << '(';
929      EmitConstantValueOnly(CE->getOperand(0));
930      O << ')';
931      switch (Opcode) {
932      case Instruction::Add:
933       O << " + ";
934       break;
935      case Instruction::Sub:
936       O << " - ";
937       break;
938      case Instruction::And:
939       O << " & ";
940       break;
941      case Instruction::Or:
942       O << " | ";
943       break;
944      case Instruction::Xor:
945       O << " ^ ";
946       break;
947      default:
948       break;
949      }
950      O << '(';
951      EmitConstantValueOnly(CE->getOperand(1));
952      O << ')';
953      break;
954    default:
955      llvm_unreachable("Unsupported operator!");
956    }
957  } else {
958    llvm_unreachable("Unknown constant value!");
959  }
960}
961
962/// printAsCString - Print the specified array as a C compatible string, only if
963/// the predicate isString is true.
964///
965static void printAsCString(formatted_raw_ostream &O, const ConstantArray *CVA,
966                           unsigned LastElt) {
967  assert(CVA->isString() && "Array is not string compatible!");
968
969  O << '\"';
970  for (unsigned i = 0; i != LastElt; ++i) {
971    unsigned char C =
972        (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
973    printStringChar(O, C);
974  }
975  O << '\"';
976}
977
978/// EmitString - Emit a zero-byte-terminated string constant.
979///
980void AsmPrinter::EmitString(const ConstantArray *CVA) const {
981  unsigned NumElts = CVA->getNumOperands();
982  if (MAI->getAscizDirective() && NumElts &&
983      cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
984    O << MAI->getAscizDirective();
985    printAsCString(O, CVA, NumElts-1);
986  } else {
987    O << MAI->getAsciiDirective();
988    printAsCString(O, CVA, NumElts);
989  }
990  O << '\n';
991}
992
993void AsmPrinter::EmitGlobalConstantArray(const ConstantArray *CVA,
994                                         unsigned AddrSpace) {
995  if (CVA->isString()) {
996    EmitString(CVA);
997  } else { // Not a string.  Print the values in successive locations
998    for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
999      EmitGlobalConstant(CVA->getOperand(i), AddrSpace);
1000  }
1001}
1002
1003void AsmPrinter::EmitGlobalConstantVector(const ConstantVector *CP) {
1004  const VectorType *PTy = CP->getType();
1005
1006  for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
1007    EmitGlobalConstant(CP->getOperand(I));
1008}
1009
1010void AsmPrinter::EmitGlobalConstantStruct(const ConstantStruct *CVS,
1011                                          unsigned AddrSpace) {
1012  // Print the fields in successive locations. Pad to align if needed!
1013  const TargetData *TD = TM.getTargetData();
1014  unsigned Size = TD->getTypeAllocSize(CVS->getType());
1015  const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
1016  uint64_t sizeSoFar = 0;
1017  for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
1018    const Constant* field = CVS->getOperand(i);
1019
1020    // Check if padding is needed and insert one or more 0s.
1021    uint64_t fieldSize = TD->getTypeAllocSize(field->getType());
1022    uint64_t padSize = ((i == e-1 ? Size : cvsLayout->getElementOffset(i+1))
1023                        - cvsLayout->getElementOffset(i)) - fieldSize;
1024    sizeSoFar += fieldSize + padSize;
1025
1026    // Now print the actual field value.
1027    EmitGlobalConstant(field, AddrSpace);
1028
1029    // Insert padding - this may include padding to increase the size of the
1030    // current field up to the ABI size (if the struct is not packed) as well
1031    // as padding to ensure that the next field starts at the right offset.
1032    EmitZeros(padSize, AddrSpace);
1033  }
1034  assert(sizeSoFar == cvsLayout->getSizeInBytes() &&
1035         "Layout of constant struct may be incorrect!");
1036}
1037
1038void AsmPrinter::EmitGlobalConstantFP(const ConstantFP *CFP,
1039                                      unsigned AddrSpace) {
1040  // FP Constants are printed as integer constants to avoid losing
1041  // precision...
1042  LLVMContext &Context = CFP->getContext();
1043  const TargetData *TD = TM.getTargetData();
1044  if (CFP->getType() == Type::getDoubleTy(Context)) {
1045    double Val = CFP->getValueAPF().convertToDouble();  // for comment only
1046    uint64_t i = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1047    if (MAI->getData64bitsDirective(AddrSpace)) {
1048      O << MAI->getData64bitsDirective(AddrSpace) << i;
1049      if (VerboseAsm) {
1050        O.PadToColumn(MAI->getCommentColumn());
1051        O << MAI->getCommentString() << " double " << Val;
1052      }
1053      O << '\n';
1054    } else if (TD->isBigEndian()) {
1055      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1056      if (VerboseAsm) {
1057        O.PadToColumn(MAI->getCommentColumn());
1058        O << MAI->getCommentString()
1059          << " most significant word of double " << Val;
1060      }
1061      O << '\n';
1062      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1063      if (VerboseAsm) {
1064        O.PadToColumn(MAI->getCommentColumn());
1065        O << MAI->getCommentString()
1066          << " least significant word of double " << Val;
1067      }
1068      O << '\n';
1069    } else {
1070      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1071      if (VerboseAsm) {
1072        O.PadToColumn(MAI->getCommentColumn());
1073        O << MAI->getCommentString()
1074          << " least significant word of double " << Val;
1075      }
1076      O << '\n';
1077      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1078      if (VerboseAsm) {
1079        O.PadToColumn(MAI->getCommentColumn());
1080        O << MAI->getCommentString()
1081          << " most significant word of double " << Val;
1082      }
1083      O << '\n';
1084    }
1085    return;
1086  } else if (CFP->getType() == Type::getFloatTy(Context)) {
1087    float Val = CFP->getValueAPF().convertToFloat();  // for comment only
1088    O << MAI->getData32bitsDirective(AddrSpace)
1089      << CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1090    if (VerboseAsm) {
1091      O.PadToColumn(MAI->getCommentColumn());
1092      O << MAI->getCommentString() << " float " << Val;
1093    }
1094    O << '\n';
1095    return;
1096  } else if (CFP->getType() == Type::getX86_FP80Ty(Context)) {
1097    // all long double variants are printed as hex
1098    // api needed to prevent premature destruction
1099    APInt api = CFP->getValueAPF().bitcastToAPInt();
1100    const uint64_t *p = api.getRawData();
1101    // Convert to double so we can print the approximate val as a comment.
1102    APFloat DoubleVal = CFP->getValueAPF();
1103    bool ignored;
1104    DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1105                      &ignored);
1106    if (TD->isBigEndian()) {
1107      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1108      if (VerboseAsm) {
1109        O.PadToColumn(MAI->getCommentColumn());
1110        O << MAI->getCommentString()
1111          << " most significant halfword of x86_fp80 ~"
1112          << DoubleVal.convertToDouble();
1113      }
1114      O << '\n';
1115      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1116      if (VerboseAsm) {
1117        O.PadToColumn(MAI->getCommentColumn());
1118        O << MAI->getCommentString() << " next halfword";
1119      }
1120      O << '\n';
1121      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1122      if (VerboseAsm) {
1123        O.PadToColumn(MAI->getCommentColumn());
1124        O << MAI->getCommentString() << " next halfword";
1125      }
1126      O << '\n';
1127      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1128      if (VerboseAsm) {
1129        O.PadToColumn(MAI->getCommentColumn());
1130        O << MAI->getCommentString() << " next halfword";
1131      }
1132      O << '\n';
1133      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1134      if (VerboseAsm) {
1135        O.PadToColumn(MAI->getCommentColumn());
1136        O << MAI->getCommentString()
1137          << " least significant halfword";
1138      }
1139      O << '\n';
1140     } else {
1141      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1142      if (VerboseAsm) {
1143        O.PadToColumn(MAI->getCommentColumn());
1144        O << MAI->getCommentString()
1145          << " least significant halfword of x86_fp80 ~"
1146          << DoubleVal.convertToDouble();
1147      }
1148      O << '\n';
1149      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1150      if (VerboseAsm) {
1151        O.PadToColumn(MAI->getCommentColumn());
1152        O << MAI->getCommentString()
1153          << " next halfword";
1154      }
1155      O << '\n';
1156      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1157      if (VerboseAsm) {
1158        O.PadToColumn(MAI->getCommentColumn());
1159        O << MAI->getCommentString()
1160          << " next halfword";
1161      }
1162      O << '\n';
1163      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1164      if (VerboseAsm) {
1165        O.PadToColumn(MAI->getCommentColumn());
1166        O << MAI->getCommentString()
1167          << " next halfword";
1168      }
1169      O << '\n';
1170      O << MAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1171      if (VerboseAsm) {
1172        O.PadToColumn(MAI->getCommentColumn());
1173        O << MAI->getCommentString()
1174          << " most significant halfword";
1175      }
1176      O << '\n';
1177    }
1178    EmitZeros(TD->getTypeAllocSize(Type::getX86_FP80Ty(Context)) -
1179              TD->getTypeStoreSize(Type::getX86_FP80Ty(Context)), AddrSpace);
1180    return;
1181  } else if (CFP->getType() == Type::getPPC_FP128Ty(Context)) {
1182    // all long double variants are printed as hex
1183    // api needed to prevent premature destruction
1184    APInt api = CFP->getValueAPF().bitcastToAPInt();
1185    const uint64_t *p = api.getRawData();
1186    if (TD->isBigEndian()) {
1187      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1188      if (VerboseAsm) {
1189        O.PadToColumn(MAI->getCommentColumn());
1190        O << MAI->getCommentString()
1191          << " most significant word of ppc_fp128";
1192      }
1193      O << '\n';
1194      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1195      if (VerboseAsm) {
1196        O.PadToColumn(MAI->getCommentColumn());
1197        O << MAI->getCommentString()
1198        << " next word";
1199      }
1200      O << '\n';
1201      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1202      if (VerboseAsm) {
1203        O.PadToColumn(MAI->getCommentColumn());
1204        O << MAI->getCommentString()
1205          << " next word";
1206      }
1207      O << '\n';
1208      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
1209      if (VerboseAsm) {
1210        O.PadToColumn(MAI->getCommentColumn());
1211        O << MAI->getCommentString()
1212          << " least significant word";
1213      }
1214      O << '\n';
1215     } else {
1216      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
1217      if (VerboseAsm) {
1218        O.PadToColumn(MAI->getCommentColumn());
1219        O << MAI->getCommentString()
1220          << " least significant word of ppc_fp128";
1221      }
1222      O << '\n';
1223      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1224      if (VerboseAsm) {
1225        O.PadToColumn(MAI->getCommentColumn());
1226        O << MAI->getCommentString()
1227          << " next word";
1228      }
1229      O << '\n';
1230      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1231      if (VerboseAsm) {
1232        O.PadToColumn(MAI->getCommentColumn());
1233        O << MAI->getCommentString()
1234          << " next word";
1235      }
1236      O << '\n';
1237      O << MAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1238      if (VerboseAsm) {
1239        O.PadToColumn(MAI->getCommentColumn());
1240        O << MAI->getCommentString()
1241          << " most significant word";
1242      }
1243      O << '\n';
1244    }
1245    return;
1246  } else llvm_unreachable("Floating point constant type not handled");
1247}
1248
1249void AsmPrinter::EmitGlobalConstantLargeInt(const ConstantInt *CI,
1250                                            unsigned AddrSpace) {
1251  const TargetData *TD = TM.getTargetData();
1252  unsigned BitWidth = CI->getBitWidth();
1253  assert(isPowerOf2_32(BitWidth) &&
1254         "Non-power-of-2-sized integers not handled!");
1255
1256  // We don't expect assemblers to support integer data directives
1257  // for more than 64 bits, so we emit the data in at most 64-bit
1258  // quantities at a time.
1259  const uint64_t *RawData = CI->getValue().getRawData();
1260  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1261    uint64_t Val;
1262    if (TD->isBigEndian())
1263      Val = RawData[e - i - 1];
1264    else
1265      Val = RawData[i];
1266
1267    if (MAI->getData64bitsDirective(AddrSpace))
1268      O << MAI->getData64bitsDirective(AddrSpace) << Val << '\n';
1269    else if (TD->isBigEndian()) {
1270      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32);
1271      if (VerboseAsm) {
1272        O.PadToColumn(MAI->getCommentColumn());
1273        O << MAI->getCommentString()
1274          << " most significant half of i64 " << Val;
1275      }
1276      O << '\n';
1277      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(Val);
1278      if (VerboseAsm) {
1279        O.PadToColumn(MAI->getCommentColumn());
1280        O << MAI->getCommentString()
1281          << " least significant half of i64 " << Val;
1282      }
1283      O << '\n';
1284    } else {
1285      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(Val);
1286      if (VerboseAsm) {
1287        O.PadToColumn(MAI->getCommentColumn());
1288        O << MAI->getCommentString()
1289          << " least significant half of i64 " << Val;
1290      }
1291      O << '\n';
1292      O << MAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32);
1293      if (VerboseAsm) {
1294        O.PadToColumn(MAI->getCommentColumn());
1295        O << MAI->getCommentString()
1296          << " most significant half of i64 " << Val;
1297      }
1298      O << '\n';
1299    }
1300  }
1301}
1302
1303/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1304void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1305  const TargetData *TD = TM.getTargetData();
1306  const Type *type = CV->getType();
1307  unsigned Size = TD->getTypeAllocSize(type);
1308
1309  if (CV->isNullValue() || isa<UndefValue>(CV)) {
1310    EmitZeros(Size, AddrSpace);
1311    return;
1312  } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
1313    EmitGlobalConstantArray(CVA , AddrSpace);
1314    return;
1315  } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
1316    EmitGlobalConstantStruct(CVS, AddrSpace);
1317    return;
1318  } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
1319    EmitGlobalConstantFP(CFP, AddrSpace);
1320    return;
1321  } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1322    // Small integers are handled below; large integers are handled here.
1323    if (Size > 4) {
1324      EmitGlobalConstantLargeInt(CI, AddrSpace);
1325      return;
1326    }
1327  } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) {
1328    EmitGlobalConstantVector(CP);
1329    return;
1330  }
1331
1332  printDataDirective(type, AddrSpace);
1333  EmitConstantValueOnly(CV);
1334  if (VerboseAsm) {
1335    if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1336      SmallString<40> S;
1337      CI->getValue().toStringUnsigned(S, 16);
1338      O.PadToColumn(MAI->getCommentColumn());
1339      O << MAI->getCommentString() << " 0x" << S.str();
1340    }
1341  }
1342  O << '\n';
1343}
1344
1345void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1346  // Target doesn't support this yet!
1347  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1348}
1349
1350/// PrintSpecial - Print information related to the specified machine instr
1351/// that is independent of the operand, and may be independent of the instr
1352/// itself.  This can be useful for portably encoding the comment character
1353/// or other bits of target-specific knowledge into the asmstrings.  The
1354/// syntax used is ${:comment}.  Targets can override this to add support
1355/// for their own strange codes.
1356void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1357  if (!strcmp(Code, "private")) {
1358    O << MAI->getPrivateGlobalPrefix();
1359  } else if (!strcmp(Code, "comment")) {
1360    if (VerboseAsm)
1361      O << MAI->getCommentString();
1362  } else if (!strcmp(Code, "uid")) {
1363    // Comparing the address of MI isn't sufficient, because machineinstrs may
1364    // be allocated to the same address across functions.
1365    const Function *ThisF = MI->getParent()->getParent()->getFunction();
1366
1367    // If this is a new LastFn instruction, bump the counter.
1368    if (LastMI != MI || LastFn != ThisF) {
1369      ++Counter;
1370      LastMI = MI;
1371      LastFn = ThisF;
1372    }
1373    O << Counter;
1374  } else {
1375    std::string msg;
1376    raw_string_ostream Msg(msg);
1377    Msg << "Unknown special formatter '" << Code
1378         << "' for machine instr: " << *MI;
1379    llvm_report_error(Msg.str());
1380  }
1381}
1382
1383/// processDebugLoc - Processes the debug information of each machine
1384/// instruction's DebugLoc.
1385void AsmPrinter::processDebugLoc(DebugLoc DL) {
1386  if (!MAI || !DW)
1387    return;
1388
1389  if (MAI->doesSupportDebugInformation() && DW->ShouldEmitDwarfDebug()) {
1390    if (!DL.isUnknown()) {
1391      DebugLocTuple CurDLT = MF->getDebugLocTuple(DL);
1392
1393      if (CurDLT.CompileUnit != 0 && PrevDLT != CurDLT)
1394        printLabel(DW->RecordSourceLine(CurDLT.Line, CurDLT.Col,
1395                                        DICompileUnit(CurDLT.CompileUnit)));
1396
1397      PrevDLT = CurDLT;
1398    }
1399  }
1400}
1401
1402/// printInlineAsm - This method formats and prints the specified machine
1403/// instruction that is an inline asm.
1404void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1405  unsigned NumOperands = MI->getNumOperands();
1406
1407  // Count the number of register definitions.
1408  unsigned NumDefs = 0;
1409  for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1410       ++NumDefs)
1411    assert(NumDefs != NumOperands-1 && "No asm string?");
1412
1413  assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1414
1415  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1416  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1417
1418  // If this asmstr is empty, just print the #APP/#NOAPP markers.
1419  // These are useful to see where empty asm's wound up.
1420  if (AsmStr[0] == 0) {
1421    O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1422    O << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
1423    return;
1424  }
1425
1426  O << MAI->getCommentString() << MAI->getInlineAsmStart() << "\n\t";
1427
1428  // The variant of the current asmprinter.
1429  int AsmPrinterVariant = MAI->getAssemblerDialect();
1430
1431  int CurVariant = -1;            // The number of the {.|.|.} region we are in.
1432  const char *LastEmitted = AsmStr; // One past the last character emitted.
1433
1434  while (*LastEmitted) {
1435    switch (*LastEmitted) {
1436    default: {
1437      // Not a special case, emit the string section literally.
1438      const char *LiteralEnd = LastEmitted+1;
1439      while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1440             *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1441        ++LiteralEnd;
1442      if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1443        O.write(LastEmitted, LiteralEnd-LastEmitted);
1444      LastEmitted = LiteralEnd;
1445      break;
1446    }
1447    case '\n':
1448      ++LastEmitted;   // Consume newline character.
1449      O << '\n';       // Indent code with newline.
1450      break;
1451    case '$': {
1452      ++LastEmitted;   // Consume '$' character.
1453      bool Done = true;
1454
1455      // Handle escapes.
1456      switch (*LastEmitted) {
1457      default: Done = false; break;
1458      case '$':     // $$ -> $
1459        if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1460          O << '$';
1461        ++LastEmitted;  // Consume second '$' character.
1462        break;
1463      case '(':             // $( -> same as GCC's { character.
1464        ++LastEmitted;      // Consume '(' character.
1465        if (CurVariant != -1) {
1466          llvm_report_error("Nested variants found in inline asm string: '"
1467                            + std::string(AsmStr) + "'");
1468        }
1469        CurVariant = 0;     // We're in the first variant now.
1470        break;
1471      case '|':
1472        ++LastEmitted;  // consume '|' character.
1473        if (CurVariant == -1)
1474          O << '|';       // this is gcc's behavior for | outside a variant
1475        else
1476          ++CurVariant;   // We're in the next variant.
1477        break;
1478      case ')':         // $) -> same as GCC's } char.
1479        ++LastEmitted;  // consume ')' character.
1480        if (CurVariant == -1)
1481          O << '}';     // this is gcc's behavior for } outside a variant
1482        else
1483          CurVariant = -1;
1484        break;
1485      }
1486      if (Done) break;
1487
1488      bool HasCurlyBraces = false;
1489      if (*LastEmitted == '{') {     // ${variable}
1490        ++LastEmitted;               // Consume '{' character.
1491        HasCurlyBraces = true;
1492      }
1493
1494      // If we have ${:foo}, then this is not a real operand reference, it is a
1495      // "magic" string reference, just like in .td files.  Arrange to call
1496      // PrintSpecial.
1497      if (HasCurlyBraces && *LastEmitted == ':') {
1498        ++LastEmitted;
1499        const char *StrStart = LastEmitted;
1500        const char *StrEnd = strchr(StrStart, '}');
1501        if (StrEnd == 0) {
1502          llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1503                            + std::string(AsmStr) + "'");
1504        }
1505
1506        std::string Val(StrStart, StrEnd);
1507        PrintSpecial(MI, Val.c_str());
1508        LastEmitted = StrEnd+1;
1509        break;
1510      }
1511
1512      const char *IDStart = LastEmitted;
1513      char *IDEnd;
1514      errno = 0;
1515      long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1516      if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1517        llvm_report_error("Bad $ operand number in inline asm string: '"
1518                          + std::string(AsmStr) + "'");
1519      }
1520      LastEmitted = IDEnd;
1521
1522      char Modifier[2] = { 0, 0 };
1523
1524      if (HasCurlyBraces) {
1525        // If we have curly braces, check for a modifier character.  This
1526        // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1527        if (*LastEmitted == ':') {
1528          ++LastEmitted;    // Consume ':' character.
1529          if (*LastEmitted == 0) {
1530            llvm_report_error("Bad ${:} expression in inline asm string: '"
1531                              + std::string(AsmStr) + "'");
1532          }
1533
1534          Modifier[0] = *LastEmitted;
1535          ++LastEmitted;    // Consume modifier character.
1536        }
1537
1538        if (*LastEmitted != '}') {
1539          llvm_report_error("Bad ${} expression in inline asm string: '"
1540                            + std::string(AsmStr) + "'");
1541        }
1542        ++LastEmitted;    // Consume '}' character.
1543      }
1544
1545      if ((unsigned)Val >= NumOperands-1) {
1546        llvm_report_error("Invalid $ operand number in inline asm string: '"
1547                          + std::string(AsmStr) + "'");
1548      }
1549
1550      // Okay, we finally have a value number.  Ask the target to print this
1551      // operand!
1552      if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1553        unsigned OpNo = 1;
1554
1555        bool Error = false;
1556
1557        // Scan to find the machine operand number for the operand.
1558        for (; Val; --Val) {
1559          if (OpNo >= MI->getNumOperands()) break;
1560          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1561          OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1562        }
1563
1564        if (OpNo >= MI->getNumOperands()) {
1565          Error = true;
1566        } else {
1567          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1568          ++OpNo;  // Skip over the ID number.
1569
1570          if (Modifier[0]=='l')  // labels are target independent
1571            printBasicBlockLabel(MI->getOperand(OpNo).getMBB(),
1572                                 false, false, false);
1573          else {
1574            AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1575            if ((OpFlags & 7) == 4) {
1576              Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1577                                                Modifier[0] ? Modifier : 0);
1578            } else {
1579              Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1580                                          Modifier[0] ? Modifier : 0);
1581            }
1582          }
1583        }
1584        if (Error) {
1585          std::string msg;
1586          raw_string_ostream Msg(msg);
1587          Msg << "Invalid operand found in inline asm: '"
1588               << AsmStr << "'\n";
1589          MI->print(Msg);
1590          llvm_report_error(Msg.str());
1591        }
1592      }
1593      break;
1594    }
1595    }
1596  }
1597  O << "\n\t" << MAI->getCommentString() << MAI->getInlineAsmEnd() << '\n';
1598}
1599
1600/// printImplicitDef - This method prints the specified machine instruction
1601/// that is an implicit def.
1602void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1603  if (VerboseAsm) {
1604    O.PadToColumn(MAI->getCommentColumn());
1605    O << MAI->getCommentString() << " implicit-def: "
1606      << TRI->getAsmName(MI->getOperand(0).getReg()) << '\n';
1607  }
1608}
1609
1610/// printLabel - This method prints a local label used by debug and
1611/// exception handling tables.
1612void AsmPrinter::printLabel(const MachineInstr *MI) const {
1613  printLabel(MI->getOperand(0).getImm());
1614}
1615
1616void AsmPrinter::printLabel(unsigned Id) const {
1617  O << MAI->getPrivateGlobalPrefix() << "label" << Id << ":\n";
1618}
1619
1620/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1621/// instruction, using the specified assembler variant.  Targets should
1622/// overried this to format as appropriate.
1623bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1624                                 unsigned AsmVariant, const char *ExtraCode) {
1625  // Target doesn't support this yet!
1626  return true;
1627}
1628
1629bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1630                                       unsigned AsmVariant,
1631                                       const char *ExtraCode) {
1632  // Target doesn't support this yet!
1633  return true;
1634}
1635
1636/// printBasicBlockLabel - This method prints the label for the specified
1637/// MachineBasicBlock
1638void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB,
1639                                      bool printAlign,
1640                                      bool printColon,
1641                                      bool printComment) const {
1642  if (printAlign) {
1643    unsigned Align = MBB->getAlignment();
1644    if (Align)
1645      EmitAlignment(Log2_32(Align));
1646  }
1647
1648  O << MAI->getPrivateGlobalPrefix() << "BB" << getFunctionNumber() << '_'
1649    << MBB->getNumber();
1650  if (printColon)
1651    O << ':';
1652  if (printComment) {
1653    if (const BasicBlock *BB = MBB->getBasicBlock())
1654      if (BB->hasName()) {
1655        O.PadToColumn(MAI->getCommentColumn());
1656        O << MAI->getCommentString() << ' ';
1657        WriteAsOperand(O, BB, /*PrintType=*/false);
1658      }
1659
1660    if (printColon)
1661      EmitComments(*MBB);
1662  }
1663}
1664
1665/// printPICJumpTableSetLabel - This method prints a set label for the
1666/// specified MachineBasicBlock for a jumptable entry.
1667void AsmPrinter::printPICJumpTableSetLabel(unsigned uid,
1668                                           const MachineBasicBlock *MBB) const {
1669  if (!MAI->getSetDirective())
1670    return;
1671
1672  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1673    << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
1674  printBasicBlockLabel(MBB, false, false, false);
1675  O << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1676    << '_' << uid << '\n';
1677}
1678
1679void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
1680                                           const MachineBasicBlock *MBB) const {
1681  if (!MAI->getSetDirective())
1682    return;
1683
1684  O << MAI->getSetDirective() << ' ' << MAI->getPrivateGlobalPrefix()
1685    << getFunctionNumber() << '_' << uid << '_' << uid2
1686    << "_set_" << MBB->getNumber() << ',';
1687  printBasicBlockLabel(MBB, false, false, false);
1688  O << '-' << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1689    << '_' << uid << '_' << uid2 << '\n';
1690}
1691
1692/// printDataDirective - This method prints the asm directive for the
1693/// specified type.
1694void AsmPrinter::printDataDirective(const Type *type, unsigned AddrSpace) {
1695  const TargetData *TD = TM.getTargetData();
1696  switch (type->getTypeID()) {
1697  case Type::FloatTyID: case Type::DoubleTyID:
1698  case Type::X86_FP80TyID: case Type::FP128TyID: case Type::PPC_FP128TyID:
1699    assert(0 && "Should have already output floating point constant.");
1700  default:
1701    assert(0 && "Can't handle printing this type of thing");
1702  case Type::IntegerTyID: {
1703    unsigned BitWidth = cast<IntegerType>(type)->getBitWidth();
1704    if (BitWidth <= 8)
1705      O << MAI->getData8bitsDirective(AddrSpace);
1706    else if (BitWidth <= 16)
1707      O << MAI->getData16bitsDirective(AddrSpace);
1708    else if (BitWidth <= 32)
1709      O << MAI->getData32bitsDirective(AddrSpace);
1710    else if (BitWidth <= 64) {
1711      assert(MAI->getData64bitsDirective(AddrSpace) &&
1712             "Target cannot handle 64-bit constant exprs!");
1713      O << MAI->getData64bitsDirective(AddrSpace);
1714    } else {
1715      llvm_unreachable("Target cannot handle given data directive width!");
1716    }
1717    break;
1718  }
1719  case Type::PointerTyID:
1720    if (TD->getPointerSize() == 8) {
1721      assert(MAI->getData64bitsDirective(AddrSpace) &&
1722             "Target cannot handle 64-bit pointer exprs!");
1723      O << MAI->getData64bitsDirective(AddrSpace);
1724    } else if (TD->getPointerSize() == 2) {
1725      O << MAI->getData16bitsDirective(AddrSpace);
1726    } else if (TD->getPointerSize() == 1) {
1727      O << MAI->getData8bitsDirective(AddrSpace);
1728    } else {
1729      O << MAI->getData32bitsDirective(AddrSpace);
1730    }
1731    break;
1732  }
1733}
1734
1735void AsmPrinter::printVisibility(const std::string& Name,
1736                                 unsigned Visibility) const {
1737  if (Visibility == GlobalValue::HiddenVisibility) {
1738    if (const char *Directive = MAI->getHiddenDirective())
1739      O << Directive << Name << '\n';
1740  } else if (Visibility == GlobalValue::ProtectedVisibility) {
1741    if (const char *Directive = MAI->getProtectedDirective())
1742      O << Directive << Name << '\n';
1743  }
1744}
1745
1746void AsmPrinter::printOffset(int64_t Offset) const {
1747  if (Offset > 0)
1748    O << '+' << Offset;
1749  else if (Offset < 0)
1750    O << Offset;
1751}
1752
1753void AsmPrinter::printMCInst(const MCInst *MI) {
1754  llvm_unreachable("MCInst printing unavailable on this target!");
1755}
1756
1757GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1758  if (!S->usesMetadata())
1759    return 0;
1760
1761  gcp_iterator GCPI = GCMetadataPrinters.find(S);
1762  if (GCPI != GCMetadataPrinters.end())
1763    return GCPI->second;
1764
1765  const char *Name = S->getName().c_str();
1766
1767  for (GCMetadataPrinterRegistry::iterator
1768         I = GCMetadataPrinterRegistry::begin(),
1769         E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1770    if (strcmp(Name, I->getName()) == 0) {
1771      GCMetadataPrinter *GMP = I->instantiate();
1772      GMP->S = S;
1773      GCMetadataPrinters.insert(std::make_pair(S, GMP));
1774      return GMP;
1775    }
1776
1777  errs() << "no GCMetadataPrinter registered for GC: " << Name << "\n";
1778  llvm_unreachable(0);
1779}
1780
1781/// EmitComments - Pretty-print comments for instructions
1782void AsmPrinter::EmitComments(const MachineInstr &MI) const {
1783  if (!VerboseAsm ||
1784      MI.getDebugLoc().isUnknown())
1785    return;
1786
1787  DebugLocTuple DLT = MF->getDebugLocTuple(MI.getDebugLoc());
1788
1789  // Print source line info.
1790  O.PadToColumn(MAI->getCommentColumn());
1791  O << MAI->getCommentString() << " SrcLine ";
1792  if (DLT.CompileUnit) {
1793    std::string Str;
1794    DICompileUnit CU(DLT.CompileUnit);
1795    O << CU.getFilename(Str) << " ";
1796  }
1797  O << DLT.Line;
1798  if (DLT.Col != 0)
1799    O << ":" << DLT.Col;
1800}
1801
1802/// EmitComments - Pretty-print comments for instructions
1803void AsmPrinter::EmitComments(const MCInst &MI) const {
1804  if (!VerboseAsm ||
1805      MI.getDebugLoc().isUnknown())
1806    return;
1807
1808  DebugLocTuple DLT = MF->getDebugLocTuple(MI.getDebugLoc());
1809
1810  // Print source line info
1811  O.PadToColumn(MAI->getCommentColumn());
1812  O << MAI->getCommentString() << " SrcLine ";
1813  if (DLT.CompileUnit) {
1814    std::string Str;
1815    DICompileUnit CU(DLT.CompileUnit);
1816    O << CU.getFilename(Str) << " ";
1817  }
1818  O << DLT.Line;
1819  if (DLT.Col != 0)
1820    O << ":" << DLT.Col;
1821}
1822
1823/// PrintChildLoopComment - Print comments about child loops within
1824/// the loop for this basic block, with nesting.
1825///
1826static void PrintChildLoopComment(formatted_raw_ostream &O,
1827                                  const MachineLoop *loop,
1828                                  const MCAsmInfo *MAI,
1829                                  int FunctionNumber) {
1830  // Add child loop information
1831  for(MachineLoop::iterator cl = loop->begin(),
1832        clend = loop->end();
1833      cl != clend;
1834      ++cl) {
1835    MachineBasicBlock *Header = (*cl)->getHeader();
1836    assert(Header && "No header for loop");
1837
1838    O << '\n';
1839    O.PadToColumn(MAI->getCommentColumn());
1840
1841    O << MAI->getCommentString();
1842    O.indent(((*cl)->getLoopDepth()-1)*2)
1843      << " Child Loop BB" << FunctionNumber << "_"
1844      << Header->getNumber() << " Depth " << (*cl)->getLoopDepth();
1845
1846    PrintChildLoopComment(O, *cl, MAI, FunctionNumber);
1847  }
1848}
1849
1850/// EmitComments - Pretty-print comments for basic blocks
1851void AsmPrinter::EmitComments(const MachineBasicBlock &MBB) const
1852{
1853  if (VerboseAsm) {
1854    // Add loop depth information
1855    const MachineLoop *loop = LI->getLoopFor(&MBB);
1856
1857    if (loop) {
1858      // Print a newline after bb# annotation.
1859      O << "\n";
1860      O.PadToColumn(MAI->getCommentColumn());
1861      O << MAI->getCommentString() << " Loop Depth " << loop->getLoopDepth()
1862        << '\n';
1863
1864      O.PadToColumn(MAI->getCommentColumn());
1865
1866      MachineBasicBlock *Header = loop->getHeader();
1867      assert(Header && "No header for loop");
1868
1869      if (Header == &MBB) {
1870        O << MAI->getCommentString() << " Loop Header";
1871        PrintChildLoopComment(O, loop, MAI, getFunctionNumber());
1872      }
1873      else {
1874        O << MAI->getCommentString() << " Loop Header is BB"
1875          << getFunctionNumber() << "_" << loop->getHeader()->getNumber();
1876      }
1877
1878      if (loop->empty()) {
1879        O << '\n';
1880        O.PadToColumn(MAI->getCommentColumn());
1881        O << MAI->getCommentString() << " Inner Loop";
1882      }
1883
1884      // Add parent loop information
1885      for (const MachineLoop *CurLoop = loop->getParentLoop();
1886           CurLoop;
1887           CurLoop = CurLoop->getParentLoop()) {
1888        MachineBasicBlock *Header = CurLoop->getHeader();
1889        assert(Header && "No header for loop");
1890
1891        O << '\n';
1892        O.PadToColumn(MAI->getCommentColumn());
1893        O << MAI->getCommentString();
1894        O.indent((CurLoop->getLoopDepth()-1)*2)
1895          << " Inside Loop BB" << getFunctionNumber() << "_"
1896          << Header->getNumber() << " Depth " << CurLoop->getLoopDepth();
1897      }
1898    }
1899  }
1900}
1901