AsmPrinter.cpp revision b8158acc23f5f0bf235fb1c6a8182a38ec9b00b2 
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/MachineJumpTableInfo.h"
22#include "llvm/CodeGen/MachineModuleInfo.h"
23#include "llvm/CodeGen/DwarfWriter.h"
24#include "llvm/Analysis/DebugInfo.h"
25#include "llvm/Support/CommandLine.h"
26#include "llvm/Support/ErrorHandling.h"
27#include "llvm/Support/FormattedStream.h"
28#include "llvm/Support/Mangler.h"
29#include "llvm/Support/raw_ostream.h"
30#include "llvm/Target/TargetAsmInfo.h"
31#include "llvm/Target/TargetData.h"
32#include "llvm/Target/TargetLowering.h"
33#include "llvm/Target/TargetOptions.h"
34#include "llvm/Target/TargetRegisterInfo.h"
35#include "llvm/ADT/SmallPtrSet.h"
36#include "llvm/ADT/SmallString.h"
37#include "llvm/ADT/StringExtras.h"
38#include <cerrno>
39using namespace llvm;
40
41static cl::opt<cl::boolOrDefault>
42AsmVerbose("asm-verbose", cl::desc("Add comments to directives."),
43           cl::init(cl::BOU_UNSET));
44
45char AsmPrinter::ID = 0;
46AsmPrinter::AsmPrinter(raw_ostream &o, TargetMachine &tm,
47                       const TargetAsmInfo *T, bool VDef)
48  : MachineFunctionPass(&ID), FunctionNumber(0), O(o),
49    TM(tm), TAI(T), TRI(tm.getRegisterInfo()),
50    IsInTextSection(false), LastMI(0), LastFn(0), Counter(~0U),
51    PrevDLT(0, ~0U, ~0U) {
52  DW = 0; MMI = 0;
53  switch (AsmVerbose) {
54  case cl::BOU_UNSET: VerboseAsm = VDef;  break;
55  case cl::BOU_TRUE:  VerboseAsm = true;  break;
56  case cl::BOU_FALSE: VerboseAsm = false; break;
57  }
58}
59
60AsmPrinter::~AsmPrinter() {
61  for (gcp_iterator I = GCMetadataPrinters.begin(),
62                    E = GCMetadataPrinters.end(); I != E; ++I)
63    delete I->second;
64}
65
66/// SwitchToTextSection - Switch to the specified text section of the executable
67/// if we are not already in it!
68///
69void AsmPrinter::SwitchToTextSection(const char *NewSection,
70                                     const GlobalValue *GV) {
71  std::string NS;
72  if (GV && GV->hasSection())
73    NS = TAI->getSwitchToSectionDirective() + GV->getSection();
74  else
75    NS = NewSection;
76
77  // If we're already in this section, we're done.
78  if (CurrentSection == NS) return;
79
80  // Close the current section, if applicable.
81  if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
82    O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n';
83
84  CurrentSection = NS;
85
86  if (!CurrentSection.empty())
87    O << CurrentSection << TAI->getTextSectionStartSuffix() << '\n';
88
89  IsInTextSection = true;
90}
91
92/// SwitchToDataSection - Switch to the specified data section of the executable
93/// if we are not already in it!
94///
95void AsmPrinter::SwitchToDataSection(const char *NewSection,
96                                     const GlobalValue *GV) {
97  std::string NS;
98  if (GV && GV->hasSection())
99    NS = TAI->getSwitchToSectionDirective() + GV->getSection();
100  else
101    NS = NewSection;
102
103  // If we're already in this section, we're done.
104  if (CurrentSection == NS) return;
105
106  // Close the current section, if applicable.
107  if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
108    O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n';
109
110  CurrentSection = NS;
111
112  if (!CurrentSection.empty())
113    O << CurrentSection << TAI->getDataSectionStartSuffix() << '\n';
114
115  IsInTextSection = false;
116}
117
118/// SwitchToSection - Switch to the specified section of the executable if we
119/// are not already in it!
120void AsmPrinter::SwitchToSection(const Section* NS) {
121  const std::string& NewSection = NS->getName();
122
123  // If we're already in this section, we're done.
124  if (CurrentSection == NewSection) return;
125
126  // Close the current section, if applicable.
127  if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
128    O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n';
129
130  // FIXME: Make CurrentSection a Section* in the future
131  CurrentSection = NewSection;
132  CurrentSection_ = NS;
133
134  if (!CurrentSection.empty()) {
135    // If section is named we need to switch into it via special '.section'
136    // directive and also append funky flags. Otherwise - section name is just
137    // some magic assembler directive.
138    if (NS->isNamed())
139      O << TAI->getSwitchToSectionDirective()
140        << CurrentSection
141        << TAI->getSectionFlags(NS->getFlags());
142    else
143      O << CurrentSection;
144    O << TAI->getDataSectionStartSuffix() << '\n';
145  }
146
147  IsInTextSection = (NS->getFlags() & SectionFlags::Code);
148}
149
150void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
151  MachineFunctionPass::getAnalysisUsage(AU);
152  AU.addRequired<GCModuleInfo>();
153}
154
155bool AsmPrinter::doInitialization(Module &M) {
156  Mang = new Mangler(M, TAI->getGlobalPrefix(), TAI->getPrivateGlobalPrefix());
157
158  if (TAI->doesAllowQuotesInName())
159    Mang->setUseQuotes(true);
160
161  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
162  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
163
164  if (TAI->hasSingleParameterDotFile()) {
165    /* Very minimal debug info. It is ignored if we emit actual
166       debug info. If we don't, this at helps the user find where
167       a function came from. */
168    O << "\t.file\t\"" << M.getModuleIdentifier() << "\"\n";
169  }
170
171  for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
172    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
173      MP->beginAssembly(O, *this, *TAI);
174
175  if (!M.getModuleInlineAsm().empty())
176    O << TAI->getCommentString() << " Start of file scope inline assembly\n"
177      << M.getModuleInlineAsm()
178      << '\n' << TAI->getCommentString()
179      << " End of file scope inline assembly\n";
180
181  SwitchToDataSection("");   // Reset back to no section.
182
183  if (TAI->doesSupportDebugInformation() ||
184      TAI->doesSupportExceptionHandling()) {
185    MMI = getAnalysisIfAvailable<MachineModuleInfo>();
186    if (MMI)
187      MMI->AnalyzeModule(M);
188    DW = getAnalysisIfAvailable<DwarfWriter>();
189    if (DW)
190      DW->BeginModule(&M, MMI, O, this, TAI);
191  }
192
193  return false;
194}
195
196bool AsmPrinter::doFinalization(Module &M) {
197  // Emit final debug information.
198  if (TAI->doesSupportDebugInformation() || TAI->doesSupportExceptionHandling())
199    DW->EndModule();
200
201  // If the target wants to know about weak references, print them all.
202  if (TAI->getWeakRefDirective()) {
203    // FIXME: This is not lazy, it would be nice to only print weak references
204    // to stuff that is actually used.  Note that doing so would require targets
205    // to notice uses in operands (due to constant exprs etc).  This should
206    // happen with the MC stuff eventually.
207    SwitchToDataSection("");
208
209    // Print out module-level global variables here.
210    for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
211         I != E; ++I) {
212      if (I->hasExternalWeakLinkage())
213        O << TAI->getWeakRefDirective() << Mang->getMangledName(I) << '\n';
214    }
215
216    for (Module::const_iterator I = M.begin(), E = M.end();
217         I != E; ++I) {
218      if (I->hasExternalWeakLinkage())
219        O << TAI->getWeakRefDirective() << Mang->getMangledName(I) << '\n';
220    }
221  }
222
223  if (TAI->getSetDirective()) {
224    if (!M.alias_empty())
225      SwitchToSection(TAI->getTextSection());
226
227    O << '\n';
228    for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
229         I != E; ++I) {
230      std::string Name = Mang->getMangledName(I);
231
232      const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
233      std::string Target = Mang->getMangledName(GV);
234
235      if (I->hasExternalLinkage() || !TAI->getWeakRefDirective())
236        O << "\t.globl\t" << Name << '\n';
237      else if (I->hasWeakLinkage())
238        O << TAI->getWeakRefDirective() << Name << '\n';
239      else if (!I->hasLocalLinkage())
240        llvm_unreachable("Invalid alias linkage");
241
242      printVisibility(Name, I->getVisibility());
243
244      O << TAI->getSetDirective() << ' ' << Name << ", " << Target << '\n';
245    }
246  }
247
248  GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();
249  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
250  for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
251    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
252      MP->finishAssembly(O, *this, *TAI);
253
254  // If we don't have any trampolines, then we don't require stack memory
255  // to be executable. Some targets have a directive to declare this.
256  Function *InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
257  if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
258    if (TAI->getNonexecutableStackDirective())
259      O << TAI->getNonexecutableStackDirective() << '\n';
260
261  delete Mang; Mang = 0;
262  DW = 0; MMI = 0;
263  return false;
264}
265
266const std::string &
267AsmPrinter::getCurrentFunctionEHName(const MachineFunction *MF,
268                                     std::string &Name) const {
269  assert(MF && "No machine function?");
270  Name = MF->getFunction()->getName();
271  if (Name.empty())
272    Name = Mang->getMangledName(MF->getFunction());
273
274  // FIXME: THIS SEEMS REALLY WRONG, it will get two prefixes.
275  Name = Mang->makeNameProper(TAI->getEHGlobalPrefix() + Name + ".eh");
276  return Name;
277}
278
279void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
280  // What's my mangled name?
281  CurrentFnName = Mang->getMangledName(MF.getFunction());
282  IncrementFunctionNumber();
283}
284
285namespace {
286  // SectionCPs - Keep track the alignment, constpool entries per Section.
287  struct SectionCPs {
288    const Section *S;
289    unsigned Alignment;
290    SmallVector<unsigned, 4> CPEs;
291    SectionCPs(const Section *s, unsigned a) : S(s), Alignment(a) {};
292  };
293}
294
295/// EmitConstantPool - Print to the current output stream assembly
296/// representations of the constants in the constant pool MCP. This is
297/// used to print out constants which have been "spilled to memory" by
298/// the code generator.
299///
300void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
301  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
302  if (CP.empty()) return;
303
304  // Calculate sections for constant pool entries. We collect entries to go into
305  // the same section together to reduce amount of section switch statements.
306  SmallVector<SectionCPs, 4> CPSections;
307  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
308    MachineConstantPoolEntry CPE = CP[i];
309    unsigned Align = CPE.getAlignment();
310    const Section* S = TAI->SelectSectionForMachineConst(CPE.getType());
311    // The number of sections are small, just do a linear search from the
312    // last section to the first.
313    bool Found = false;
314    unsigned SecIdx = CPSections.size();
315    while (SecIdx != 0) {
316      if (CPSections[--SecIdx].S == S) {
317        Found = true;
318        break;
319      }
320    }
321    if (!Found) {
322      SecIdx = CPSections.size();
323      CPSections.push_back(SectionCPs(S, Align));
324    }
325
326    if (Align > CPSections[SecIdx].Alignment)
327      CPSections[SecIdx].Alignment = Align;
328    CPSections[SecIdx].CPEs.push_back(i);
329  }
330
331  // Now print stuff into the calculated sections.
332  for (unsigned i = 0, e = CPSections.size(); i != e; ++i) {
333    SwitchToSection(CPSections[i].S);
334    EmitAlignment(Log2_32(CPSections[i].Alignment));
335
336    unsigned Offset = 0;
337    for (unsigned j = 0, ee = CPSections[i].CPEs.size(); j != ee; ++j) {
338      unsigned CPI = CPSections[i].CPEs[j];
339      MachineConstantPoolEntry CPE = CP[CPI];
340
341      // Emit inter-object padding for alignment.
342      unsigned AlignMask = CPE.getAlignment() - 1;
343      unsigned NewOffset = (Offset + AlignMask) & ~AlignMask;
344      EmitZeros(NewOffset - Offset);
345
346      const Type *Ty = CPE.getType();
347      Offset = NewOffset + TM.getTargetData()->getTypeAllocSize(Ty);
348
349      O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
350        << CPI << ":\t\t\t\t\t";
351      if (VerboseAsm) {
352        O << TAI->getCommentString() << ' ';
353        WriteTypeSymbolic(O, CPE.getType(), 0);
354      }
355      O << '\n';
356      if (CPE.isMachineConstantPoolEntry())
357        EmitMachineConstantPoolValue(CPE.Val.MachineCPVal);
358      else
359        EmitGlobalConstant(CPE.Val.ConstVal);
360    }
361  }
362}
363
364/// EmitJumpTableInfo - Print assembly representations of the jump tables used
365/// by the current function to the current output stream.
366///
367void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
368                                   MachineFunction &MF) {
369  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
370  if (JT.empty()) return;
371
372  bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
373
374  // Pick the directive to use to print the jump table entries, and switch to
375  // the appropriate section.
376  TargetLowering *LoweringInfo = TM.getTargetLowering();
377
378  const char* JumpTableDataSection = TAI->getJumpTableDataSection();
379  const Function *F = MF.getFunction();
380  unsigned SectionFlags = TAI->SectionFlagsForGlobal(F);
381  bool JTInDiffSection = false;
382  if ((IsPic && !(LoweringInfo && LoweringInfo->usesGlobalOffsetTable())) ||
383      !JumpTableDataSection ||
384      SectionFlags & SectionFlags::Linkonce) {
385    // In PIC mode, we need to emit the jump table to the same section as the
386    // function body itself, otherwise the label differences won't make sense.
387    // We should also do if the section name is NULL or function is declared in
388    // discardable section.
389    SwitchToSection(TAI->SectionForGlobal(F));
390  } else {
391    SwitchToDataSection(JumpTableDataSection);
392    JTInDiffSection = true;
393  }
394
395  EmitAlignment(Log2_32(MJTI->getAlignment()));
396
397  for (unsigned i = 0, e = JT.size(); i != e; ++i) {
398    const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
399
400    // If this jump table was deleted, ignore it.
401    if (JTBBs.empty()) continue;
402
403    // For PIC codegen, if possible we want to use the SetDirective to reduce
404    // the number of relocations the assembler will generate for the jump table.
405    // Set directives are all printed before the jump table itself.
406    SmallPtrSet<MachineBasicBlock*, 16> EmittedSets;
407    if (TAI->getSetDirective() && IsPic)
408      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
409        if (EmittedSets.insert(JTBBs[ii]))
410          printPICJumpTableSetLabel(i, JTBBs[ii]);
411
412    // On some targets (e.g. darwin) we want to emit two consequtive labels
413    // before each jump table.  The first label is never referenced, but tells
414    // the assembler and linker the extents of the jump table object.  The
415    // second label is actually referenced by the code.
416    if (JTInDiffSection) {
417      if (const char *JTLabelPrefix = TAI->getJumpTableSpecialLabelPrefix())
418        O << JTLabelPrefix << "JTI" << getFunctionNumber() << '_' << i << ":\n";
419    }
420
421    O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
422      << '_' << i << ":\n";
423
424    for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
425      printPICJumpTableEntry(MJTI, JTBBs[ii], i);
426      O << '\n';
427    }
428  }
429}
430
431void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
432                                        const MachineBasicBlock *MBB,
433                                        unsigned uid)  const {
434  bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
435
436  // Use JumpTableDirective otherwise honor the entry size from the jump table
437  // info.
438  const char *JTEntryDirective = TAI->getJumpTableDirective();
439  bool HadJTEntryDirective = JTEntryDirective != NULL;
440  if (!HadJTEntryDirective) {
441    JTEntryDirective = MJTI->getEntrySize() == 4 ?
442      TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
443  }
444
445  O << JTEntryDirective << ' ';
446
447  // If we have emitted set directives for the jump table entries, print
448  // them rather than the entries themselves.  If we're emitting PIC, then
449  // emit the table entries as differences between two text section labels.
450  // If we're emitting non-PIC code, then emit the entries as direct
451  // references to the target basic blocks.
452  if (IsPic) {
453    if (TAI->getSetDirective()) {
454      O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
455        << '_' << uid << "_set_" << MBB->getNumber();
456    } else {
457      printBasicBlockLabel(MBB, false, false, false);
458      // If the arch uses custom Jump Table directives, don't calc relative to
459      // JT
460      if (!HadJTEntryDirective)
461        O << '-' << TAI->getPrivateGlobalPrefix() << "JTI"
462          << getFunctionNumber() << '_' << uid;
463    }
464  } else {
465    printBasicBlockLabel(MBB, false, false, false);
466  }
467}
468
469
470/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
471/// special global used by LLVM.  If so, emit it and return true, otherwise
472/// do nothing and return false.
473bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
474  if (GV->getName() == "llvm.used") {
475    if (TAI->getUsedDirective() != 0)    // No need to emit this at all.
476      EmitLLVMUsedList(GV->getInitializer());
477    return true;
478  }
479
480  // Ignore debug and non-emitted data.
481  if (GV->getSection() == "llvm.metadata" ||
482      GV->hasAvailableExternallyLinkage())
483    return true;
484
485  if (!GV->hasAppendingLinkage()) return false;
486
487  assert(GV->hasInitializer() && "Not a special LLVM global!");
488
489  const TargetData *TD = TM.getTargetData();
490  unsigned Align = Log2_32(TD->getPointerPrefAlignment());
491  if (GV->getName() == "llvm.global_ctors") {
492    SwitchToDataSection(TAI->getStaticCtorsSection());
493    EmitAlignment(Align, 0);
494    EmitXXStructorList(GV->getInitializer());
495    return true;
496  }
497
498  if (GV->getName() == "llvm.global_dtors") {
499    SwitchToDataSection(TAI->getStaticDtorsSection());
500    EmitAlignment(Align, 0);
501    EmitXXStructorList(GV->getInitializer());
502    return true;
503  }
504
505  return false;
506}
507
508/// findGlobalValue - if CV is an expression equivalent to a single
509/// global value, return that value.
510const GlobalValue * AsmPrinter::findGlobalValue(const Constant *CV) {
511  if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV))
512    return GV;
513  else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
514    const TargetData *TD = TM.getTargetData();
515    unsigned Opcode = CE->getOpcode();
516    switch (Opcode) {
517    case Instruction::GetElementPtr: {
518      const Constant *ptrVal = CE->getOperand(0);
519      SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
520      if (TD->getIndexedOffset(ptrVal->getType(), &idxVec[0], idxVec.size()))
521        return 0;
522      return findGlobalValue(ptrVal);
523    }
524    case Instruction::BitCast:
525      return findGlobalValue(CE->getOperand(0));
526    default:
527      return 0;
528    }
529  }
530  return 0;
531}
532
533/// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each
534/// global in the specified llvm.used list for which emitUsedDirectiveFor
535/// is true, as being used with this directive.
536
537void AsmPrinter::EmitLLVMUsedList(Constant *List) {
538  const char *Directive = TAI->getUsedDirective();
539
540  // Should be an array of 'i8*'.
541  ConstantArray *InitList = dyn_cast<ConstantArray>(List);
542  if (InitList == 0) return;
543
544  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
545    const GlobalValue *GV = findGlobalValue(InitList->getOperand(i));
546    if (TAI->emitUsedDirectiveFor(GV, Mang)) {
547      O << Directive;
548      EmitConstantValueOnly(InitList->getOperand(i));
549      O << '\n';
550    }
551  }
552}
553
554/// EmitXXStructorList - Emit the ctor or dtor list.  This just prints out the
555/// function pointers, ignoring the init priority.
556void AsmPrinter::EmitXXStructorList(Constant *List) {
557  // Should be an array of '{ int, void ()* }' structs.  The first value is the
558  // init priority, which we ignore.
559  if (!isa<ConstantArray>(List)) return;
560  ConstantArray *InitList = cast<ConstantArray>(List);
561  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
562    if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
563      if (CS->getNumOperands() != 2) return;  // Not array of 2-element structs.
564
565      if (CS->getOperand(1)->isNullValue())
566        return;  // Found a null terminator, exit printing.
567      // Emit the function pointer.
568      EmitGlobalConstant(CS->getOperand(1));
569    }
570}
571
572/// getGlobalLinkName - Returns the asm/link name of of the specified
573/// global variable.  Should be overridden by each target asm printer to
574/// generate the appropriate value.
575const std::string &AsmPrinter::getGlobalLinkName(const GlobalVariable *GV,
576                                                 std::string &LinkName) const {
577  if (isa<Function>(GV)) {
578    LinkName += TAI->getFunctionAddrPrefix();
579    LinkName += Mang->getMangledName(GV);
580    LinkName += TAI->getFunctionAddrSuffix();
581  } else {
582    LinkName += TAI->getGlobalVarAddrPrefix();
583    LinkName += Mang->getMangledName(GV);
584    LinkName += TAI->getGlobalVarAddrSuffix();
585  }
586
587  return LinkName;
588}
589
590/// EmitExternalGlobal - Emit the external reference to a global variable.
591/// Should be overridden if an indirect reference should be used.
592void AsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) {
593  std::string GLN;
594  O << getGlobalLinkName(GV, GLN);
595}
596
597
598
599//===----------------------------------------------------------------------===//
600/// LEB 128 number encoding.
601
602/// PrintULEB128 - Print a series of hexidecimal values (separated by commas)
603/// representing an unsigned leb128 value.
604void AsmPrinter::PrintULEB128(unsigned Value) const {
605  char Buffer[20];
606  do {
607    unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
608    Value >>= 7;
609    if (Value) Byte |= 0x80;
610    O << "0x" << utohex_buffer(Byte, Buffer+20);
611    if (Value) O << ", ";
612  } while (Value);
613}
614
615/// PrintSLEB128 - Print a series of hexidecimal values (separated by commas)
616/// representing a signed leb128 value.
617void AsmPrinter::PrintSLEB128(int Value) const {
618  int Sign = Value >> (8 * sizeof(Value) - 1);
619  bool IsMore;
620  char Buffer[20];
621
622  do {
623    unsigned char Byte = static_cast<unsigned char>(Value & 0x7f);
624    Value >>= 7;
625    IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
626    if (IsMore) Byte |= 0x80;
627    O << "0x" << utohex_buffer(Byte, Buffer+20);
628    if (IsMore) O << ", ";
629  } while (IsMore);
630}
631
632//===--------------------------------------------------------------------===//
633// Emission and print routines
634//
635
636/// PrintHex - Print a value as a hexidecimal value.
637///
638void AsmPrinter::PrintHex(int Value) const {
639  char Buffer[20];
640  O << "0x" << utohex_buffer(static_cast<unsigned>(Value), Buffer+20);
641}
642
643/// EOL - Print a newline character to asm stream.  If a comment is present
644/// then it will be printed first.  Comments should not contain '\n'.
645void AsmPrinter::EOL() const {
646  O << '\n';
647}
648
649void AsmPrinter::EOL(const std::string &Comment) const {
650  if (VerboseAsm && !Comment.empty()) {
651    O << '\t'
652      << TAI->getCommentString()
653      << ' '
654      << Comment;
655  }
656  O << '\n';
657}
658
659void AsmPrinter::EOL(const char* Comment) const {
660  if (VerboseAsm && *Comment) {
661    O << '\t'
662      << TAI->getCommentString()
663      << ' '
664      << Comment;
665  }
666  O << '\n';
667}
668
669/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
670/// unsigned leb128 value.
671void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
672  if (TAI->hasLEB128()) {
673    O << "\t.uleb128\t"
674      << Value;
675  } else {
676    O << TAI->getData8bitsDirective();
677    PrintULEB128(Value);
678  }
679}
680
681/// EmitSLEB128Bytes - print an assembler byte data directive to compose a
682/// signed leb128 value.
683void AsmPrinter::EmitSLEB128Bytes(int Value) const {
684  if (TAI->hasLEB128()) {
685    O << "\t.sleb128\t"
686      << Value;
687  } else {
688    O << TAI->getData8bitsDirective();
689    PrintSLEB128(Value);
690  }
691}
692
693/// EmitInt8 - Emit a byte directive and value.
694///
695void AsmPrinter::EmitInt8(int Value) const {
696  O << TAI->getData8bitsDirective();
697  PrintHex(Value & 0xFF);
698}
699
700/// EmitInt16 - Emit a short directive and value.
701///
702void AsmPrinter::EmitInt16(int Value) const {
703  O << TAI->getData16bitsDirective();
704  PrintHex(Value & 0xFFFF);
705}
706
707/// EmitInt32 - Emit a long directive and value.
708///
709void AsmPrinter::EmitInt32(int Value) const {
710  O << TAI->getData32bitsDirective();
711  PrintHex(Value);
712}
713
714/// EmitInt64 - Emit a long long directive and value.
715///
716void AsmPrinter::EmitInt64(uint64_t Value) const {
717  if (TAI->getData64bitsDirective()) {
718    O << TAI->getData64bitsDirective();
719    PrintHex(Value);
720  } else {
721    if (TM.getTargetData()->isBigEndian()) {
722      EmitInt32(unsigned(Value >> 32)); O << '\n';
723      EmitInt32(unsigned(Value));
724    } else {
725      EmitInt32(unsigned(Value)); O << '\n';
726      EmitInt32(unsigned(Value >> 32));
727    }
728  }
729}
730
731/// toOctal - Convert the low order bits of X into an octal digit.
732///
733static inline char toOctal(int X) {
734  return (X&7)+'0';
735}
736
737/// printStringChar - Print a char, escaped if necessary.
738///
739static void printStringChar(raw_ostream &O, unsigned char C) {
740  if (C == '"') {
741    O << "\\\"";
742  } else if (C == '\\') {
743    O << "\\\\";
744  } else if (isprint((unsigned char)C)) {
745    O << C;
746  } else {
747    switch(C) {
748    case '\b': O << "\\b"; break;
749    case '\f': O << "\\f"; break;
750    case '\n': O << "\\n"; break;
751    case '\r': O << "\\r"; break;
752    case '\t': O << "\\t"; break;
753    default:
754      O << '\\';
755      O << toOctal(C >> 6);
756      O << toOctal(C >> 3);
757      O << toOctal(C >> 0);
758      break;
759    }
760  }
761}
762
763/// EmitString - Emit a string with quotes and a null terminator.
764/// Special characters are emitted properly.
765/// \literal (Eg. '\t') \endliteral
766void AsmPrinter::EmitString(const std::string &String) const {
767  EmitString(String.c_str(), String.size());
768}
769
770void AsmPrinter::EmitString(const char *String, unsigned Size) const {
771  const char* AscizDirective = TAI->getAscizDirective();
772  if (AscizDirective)
773    O << AscizDirective;
774  else
775    O << TAI->getAsciiDirective();
776  O << '\"';
777  for (unsigned i = 0; i < Size; ++i)
778    printStringChar(O, String[i]);
779  if (AscizDirective)
780    O << '\"';
781  else
782    O << "\\0\"";
783}
784
785
786/// EmitFile - Emit a .file directive.
787void AsmPrinter::EmitFile(unsigned Number, const std::string &Name) const {
788  O << "\t.file\t" << Number << " \"";
789  for (unsigned i = 0, N = Name.size(); i < N; ++i)
790    printStringChar(O, Name[i]);
791  O << '\"';
792}
793
794
795//===----------------------------------------------------------------------===//
796
797// EmitAlignment - Emit an alignment directive to the specified power of
798// two boundary.  For example, if you pass in 3 here, you will get an 8
799// byte alignment.  If a global value is specified, and if that global has
800// an explicit alignment requested, it will unconditionally override the
801// alignment request.  However, if ForcedAlignBits is specified, this value
802// has final say: the ultimate alignment will be the max of ForcedAlignBits
803// and the alignment computed with NumBits and the global.
804//
805// The algorithm is:
806//     Align = NumBits;
807//     if (GV && GV->hasalignment) Align = GV->getalignment();
808//     Align = std::max(Align, ForcedAlignBits);
809//
810void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
811                               unsigned ForcedAlignBits,
812                               bool UseFillExpr) const {
813  if (GV && GV->getAlignment())
814    NumBits = Log2_32(GV->getAlignment());
815  NumBits = std::max(NumBits, ForcedAlignBits);
816
817  if (NumBits == 0) return;   // No need to emit alignment.
818  if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits;
819  O << TAI->getAlignDirective() << NumBits;
820
821  unsigned FillValue = TAI->getTextAlignFillValue();
822  UseFillExpr &= IsInTextSection && FillValue;
823  if (UseFillExpr) {
824    O << ',';
825    PrintHex(FillValue);
826  }
827  O << '\n';
828}
829
830
831/// EmitZeros - Emit a block of zeros.
832///
833void AsmPrinter::EmitZeros(uint64_t NumZeros, unsigned AddrSpace) const {
834  if (NumZeros) {
835    if (TAI->getZeroDirective()) {
836      O << TAI->getZeroDirective() << NumZeros;
837      if (TAI->getZeroDirectiveSuffix())
838        O << TAI->getZeroDirectiveSuffix();
839      O << '\n';
840    } else {
841      for (; NumZeros; --NumZeros)
842        O << TAI->getData8bitsDirective(AddrSpace) << "0\n";
843    }
844  }
845}
846
847// Print out the specified constant, without a storage class.  Only the
848// constants valid in constant expressions can occur here.
849void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
850  if (CV->isNullValue() || isa<UndefValue>(CV))
851    O << '0';
852  else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
853    O << CI->getZExtValue();
854  } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
855    // This is a constant address for a global variable or function. Use the
856    // name of the variable or function as the address value, possibly
857    // decorating it with GlobalVarAddrPrefix/Suffix or
858    // FunctionAddrPrefix/Suffix (these all default to "" )
859    if (isa<Function>(GV)) {
860      O << TAI->getFunctionAddrPrefix()
861        << Mang->getMangledName(GV)
862        << TAI->getFunctionAddrSuffix();
863    } else {
864      O << TAI->getGlobalVarAddrPrefix()
865        << Mang->getMangledName(GV)
866        << TAI->getGlobalVarAddrSuffix();
867    }
868  } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
869    const TargetData *TD = TM.getTargetData();
870    unsigned Opcode = CE->getOpcode();
871    switch (Opcode) {
872    case Instruction::GetElementPtr: {
873      // generate a symbolic expression for the byte address
874      const Constant *ptrVal = CE->getOperand(0);
875      SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
876      if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
877                                                idxVec.size())) {
878        // Truncate/sext the offset to the pointer size.
879        if (TD->getPointerSizeInBits() != 64) {
880          int SExtAmount = 64-TD->getPointerSizeInBits();
881          Offset = (Offset << SExtAmount) >> SExtAmount;
882        }
883
884        if (Offset)
885          O << '(';
886        EmitConstantValueOnly(ptrVal);
887        if (Offset > 0)
888          O << ") + " << Offset;
889        else if (Offset < 0)
890          O << ") - " << -Offset;
891      } else {
892        EmitConstantValueOnly(ptrVal);
893      }
894      break;
895    }
896    case Instruction::Trunc:
897    case Instruction::ZExt:
898    case Instruction::SExt:
899    case Instruction::FPTrunc:
900    case Instruction::FPExt:
901    case Instruction::UIToFP:
902    case Instruction::SIToFP:
903    case Instruction::FPToUI:
904    case Instruction::FPToSI:
905      llvm_unreachable("FIXME: Don't yet support this kind of constant cast expr");
906      break;
907    case Instruction::BitCast:
908      return EmitConstantValueOnly(CE->getOperand(0));
909
910    case Instruction::IntToPtr: {
911      // Handle casts to pointers by changing them into casts to the appropriate
912      // integer type.  This promotes constant folding and simplifies this code.
913      Constant *Op = CE->getOperand(0);
914      Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(), false/*ZExt*/);
915      return EmitConstantValueOnly(Op);
916    }
917
918
919    case Instruction::PtrToInt: {
920      // Support only foldable casts to/from pointers that can be eliminated by
921      // changing the pointer to the appropriately sized integer type.
922      Constant *Op = CE->getOperand(0);
923      const Type *Ty = CE->getType();
924
925      // We can emit the pointer value into this slot if the slot is an
926      // integer slot greater or equal to the size of the pointer.
927      if (TD->getTypeAllocSize(Ty) >= TD->getTypeAllocSize(Op->getType()))
928        return EmitConstantValueOnly(Op);
929
930      O << "((";
931      EmitConstantValueOnly(Op);
932      APInt ptrMask = APInt::getAllOnesValue(TD->getTypeAllocSizeInBits(Ty));
933
934      SmallString<40> S;
935      ptrMask.toStringUnsigned(S);
936      O << ") & " << S.c_str() << ')';
937      break;
938    }
939    case Instruction::Add:
940    case Instruction::Sub:
941    case Instruction::And:
942    case Instruction::Or:
943    case Instruction::Xor:
944      O << '(';
945      EmitConstantValueOnly(CE->getOperand(0));
946      O << ')';
947      switch (Opcode) {
948      case Instruction::Add:
949       O << " + ";
950       break;
951      case Instruction::Sub:
952       O << " - ";
953       break;
954      case Instruction::And:
955       O << " & ";
956       break;
957      case Instruction::Or:
958       O << " | ";
959       break;
960      case Instruction::Xor:
961       O << " ^ ";
962       break;
963      default:
964       break;
965      }
966      O << '(';
967      EmitConstantValueOnly(CE->getOperand(1));
968      O << ')';
969      break;
970    default:
971      llvm_unreachable("Unsupported operator!");
972    }
973  } else {
974    llvm_unreachable("Unknown constant value!");
975  }
976}
977
978/// printAsCString - Print the specified array as a C compatible string, only if
979/// the predicate isString is true.
980///
981static void printAsCString(raw_ostream &O, const ConstantArray *CVA,
982                           unsigned LastElt) {
983  assert(CVA->isString() && "Array is not string compatible!");
984
985  O << '\"';
986  for (unsigned i = 0; i != LastElt; ++i) {
987    unsigned char C =
988        (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
989    printStringChar(O, C);
990  }
991  O << '\"';
992}
993
994/// EmitString - Emit a zero-byte-terminated string constant.
995///
996void AsmPrinter::EmitString(const ConstantArray *CVA) const {
997  unsigned NumElts = CVA->getNumOperands();
998  if (TAI->getAscizDirective() && NumElts &&
999      cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
1000    O << TAI->getAscizDirective();
1001    printAsCString(O, CVA, NumElts-1);
1002  } else {
1003    O << TAI->getAsciiDirective();
1004    printAsCString(O, CVA, NumElts);
1005  }
1006  O << '\n';
1007}
1008
1009void AsmPrinter::EmitGlobalConstantArray(const ConstantArray *CVA,
1010                                         unsigned AddrSpace) {
1011  if (CVA->isString()) {
1012    EmitString(CVA);
1013  } else { // Not a string.  Print the values in successive locations
1014    for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
1015      EmitGlobalConstant(CVA->getOperand(i), AddrSpace);
1016  }
1017}
1018
1019void AsmPrinter::EmitGlobalConstantVector(const ConstantVector *CP) {
1020  const VectorType *PTy = CP->getType();
1021
1022  for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
1023    EmitGlobalConstant(CP->getOperand(I));
1024}
1025
1026void AsmPrinter::EmitGlobalConstantStruct(const ConstantStruct *CVS,
1027                                          unsigned AddrSpace) {
1028  // Print the fields in successive locations. Pad to align if needed!
1029  const TargetData *TD = TM.getTargetData();
1030  unsigned Size = TD->getTypeAllocSize(CVS->getType());
1031  const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
1032  uint64_t sizeSoFar = 0;
1033  for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
1034    const Constant* field = CVS->getOperand(i);
1035
1036    // Check if padding is needed and insert one or more 0s.
1037    uint64_t fieldSize = TD->getTypeAllocSize(field->getType());
1038    uint64_t padSize = ((i == e-1 ? Size : cvsLayout->getElementOffset(i+1))
1039                        - cvsLayout->getElementOffset(i)) - fieldSize;
1040    sizeSoFar += fieldSize + padSize;
1041
1042    // Now print the actual field value.
1043    EmitGlobalConstant(field, AddrSpace);
1044
1045    // Insert padding - this may include padding to increase the size of the
1046    // current field up to the ABI size (if the struct is not packed) as well
1047    // as padding to ensure that the next field starts at the right offset.
1048    EmitZeros(padSize, AddrSpace);
1049  }
1050  assert(sizeSoFar == cvsLayout->getSizeInBytes() &&
1051         "Layout of constant struct may be incorrect!");
1052}
1053
1054void AsmPrinter::EmitGlobalConstantFP(const ConstantFP *CFP,
1055                                      unsigned AddrSpace) {
1056  // FP Constants are printed as integer constants to avoid losing
1057  // precision...
1058  const TargetData *TD = TM.getTargetData();
1059  if (CFP->getType() == Type::DoubleTy) {
1060    double Val = CFP->getValueAPF().convertToDouble();  // for comment only
1061    uint64_t i = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1062    if (TAI->getData64bitsDirective(AddrSpace)) {
1063      O << TAI->getData64bitsDirective(AddrSpace) << i;
1064      if (VerboseAsm)
1065        O << '\t' << TAI->getCommentString() << " double value: " << Val;
1066      O << '\n';
1067    } else if (TD->isBigEndian()) {
1068      O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1069      if (VerboseAsm)
1070        O << '\t' << TAI->getCommentString()
1071          << " double most significant word " << Val;
1072      O << '\n';
1073      O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1074      if (VerboseAsm)
1075        O << '\t' << TAI->getCommentString()
1076          << " double least significant word " << Val;
1077      O << '\n';
1078    } else {
1079      O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i);
1080      if (VerboseAsm)
1081        O << '\t' << TAI->getCommentString()
1082          << " double least significant word " << Val;
1083      O << '\n';
1084      O << TAI->getData32bitsDirective(AddrSpace) << unsigned(i >> 32);
1085      if (VerboseAsm)
1086        O << '\t' << TAI->getCommentString()
1087          << " double most significant word " << Val;
1088      O << '\n';
1089    }
1090    return;
1091  } else if (CFP->getType() == Type::FloatTy) {
1092    float Val = CFP->getValueAPF().convertToFloat();  // for comment only
1093    O << TAI->getData32bitsDirective(AddrSpace)
1094      << CFP->getValueAPF().bitcastToAPInt().getZExtValue();
1095    if (VerboseAsm)
1096      O << '\t' << TAI->getCommentString() << " float " << Val;
1097    O << '\n';
1098    return;
1099  } else if (CFP->getType() == Type::X86_FP80Ty) {
1100    // all long double variants are printed as hex
1101    // api needed to prevent premature destruction
1102    APInt api = CFP->getValueAPF().bitcastToAPInt();
1103    const uint64_t *p = api.getRawData();
1104    // Convert to double so we can print the approximate val as a comment.
1105    APFloat DoubleVal = CFP->getValueAPF();
1106    bool ignored;
1107    DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
1108                      &ignored);
1109    if (TD->isBigEndian()) {
1110      O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1111      if (VerboseAsm)
1112        O << '\t' << TAI->getCommentString()
1113          << " long double most significant halfword of ~"
1114          << DoubleVal.convertToDouble();
1115      O << '\n';
1116      O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1117      if (VerboseAsm)
1118        O << '\t' << TAI->getCommentString() << " long double next halfword";
1119      O << '\n';
1120      O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1121      if (VerboseAsm)
1122        O << '\t' << TAI->getCommentString() << " long double next halfword";
1123      O << '\n';
1124      O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1125      if (VerboseAsm)
1126        O << '\t' << TAI->getCommentString() << " long double next halfword";
1127      O << '\n';
1128      O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1129      if (VerboseAsm)
1130        O << '\t' << TAI->getCommentString()
1131          << " long double least significant halfword";
1132      O << '\n';
1133     } else {
1134      O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0]);
1135      if (VerboseAsm)
1136        O << '\t' << TAI->getCommentString()
1137          << " long double least significant halfword of ~"
1138          << DoubleVal.convertToDouble();
1139      O << '\n';
1140      O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 16);
1141      if (VerboseAsm)
1142        O << '\t' << TAI->getCommentString()
1143          << " long double next halfword";
1144      O << '\n';
1145      O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 32);
1146      if (VerboseAsm)
1147        O << '\t' << TAI->getCommentString()
1148          << " long double next halfword";
1149      O << '\n';
1150      O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[0] >> 48);
1151      if (VerboseAsm)
1152        O << '\t' << TAI->getCommentString()
1153          << " long double next halfword";
1154      O << '\n';
1155      O << TAI->getData16bitsDirective(AddrSpace) << uint16_t(p[1]);
1156      if (VerboseAsm)
1157        O << '\t' << TAI->getCommentString()
1158          << " long double most significant halfword";
1159      O << '\n';
1160    }
1161    EmitZeros(TD->getTypeAllocSize(Type::X86_FP80Ty) -
1162              TD->getTypeStoreSize(Type::X86_FP80Ty), AddrSpace);
1163    return;
1164  } else if (CFP->getType() == Type::PPC_FP128Ty) {
1165    // all long double variants are printed as hex
1166    // api needed to prevent premature destruction
1167    APInt api = CFP->getValueAPF().bitcastToAPInt();
1168    const uint64_t *p = api.getRawData();
1169    if (TD->isBigEndian()) {
1170      O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1171      if (VerboseAsm)
1172        O << '\t' << TAI->getCommentString()
1173          << " long double most significant word";
1174      O << '\n';
1175      O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1176      if (VerboseAsm)
1177        O << '\t' << TAI->getCommentString()
1178        << " long double next word";
1179      O << '\n';
1180      O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1181      if (VerboseAsm)
1182        O << '\t' << TAI->getCommentString()
1183          << " long double next word";
1184      O << '\n';
1185      O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
1186      if (VerboseAsm)
1187        O << '\t' << TAI->getCommentString()
1188          << " long double least significant word";
1189      O << '\n';
1190     } else {
1191      O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1]);
1192      if (VerboseAsm)
1193        O << '\t' << TAI->getCommentString()
1194          << " long double least significant word";
1195      O << '\n';
1196      O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[1] >> 32);
1197      if (VerboseAsm)
1198        O << '\t' << TAI->getCommentString()
1199          << " long double next word";
1200      O << '\n';
1201      O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0]);
1202      if (VerboseAsm)
1203        O << '\t' << TAI->getCommentString()
1204          << " long double next word";
1205      O << '\n';
1206      O << TAI->getData32bitsDirective(AddrSpace) << uint32_t(p[0] >> 32);
1207      if (VerboseAsm)
1208        O << '\t' << TAI->getCommentString()
1209          << " long double most significant word";
1210      O << '\n';
1211    }
1212    return;
1213  } else llvm_unreachable("Floating point constant type not handled");
1214}
1215
1216void AsmPrinter::EmitGlobalConstantLargeInt(const ConstantInt *CI,
1217                                            unsigned AddrSpace) {
1218  const TargetData *TD = TM.getTargetData();
1219  unsigned BitWidth = CI->getBitWidth();
1220  assert(isPowerOf2_32(BitWidth) &&
1221         "Non-power-of-2-sized integers not handled!");
1222
1223  // We don't expect assemblers to support integer data directives
1224  // for more than 64 bits, so we emit the data in at most 64-bit
1225  // quantities at a time.
1226  const uint64_t *RawData = CI->getValue().getRawData();
1227  for (unsigned i = 0, e = BitWidth / 64; i != e; ++i) {
1228    uint64_t Val;
1229    if (TD->isBigEndian())
1230      Val = RawData[e - i - 1];
1231    else
1232      Val = RawData[i];
1233
1234    if (TAI->getData64bitsDirective(AddrSpace))
1235      O << TAI->getData64bitsDirective(AddrSpace) << Val << '\n';
1236    else if (TD->isBigEndian()) {
1237      O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32);
1238      if (VerboseAsm)
1239        O << '\t' << TAI->getCommentString()
1240          << " Double-word most significant word " << Val;
1241      O << '\n';
1242      O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val);
1243      if (VerboseAsm)
1244        O << '\t' << TAI->getCommentString()
1245          << " Double-word least significant word " << Val;
1246      O << '\n';
1247    } else {
1248      O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val);
1249      if (VerboseAsm)
1250        O << '\t' << TAI->getCommentString()
1251          << " Double-word least significant word " << Val;
1252      O << '\n';
1253      O << TAI->getData32bitsDirective(AddrSpace) << unsigned(Val >> 32);
1254      if (VerboseAsm)
1255        O << '\t' << TAI->getCommentString()
1256          << " Double-word most significant word " << Val;
1257      O << '\n';
1258    }
1259  }
1260}
1261
1262/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
1263void AsmPrinter::EmitGlobalConstant(const Constant *CV, unsigned AddrSpace) {
1264  const TargetData *TD = TM.getTargetData();
1265  const Type *type = CV->getType();
1266  unsigned Size = TD->getTypeAllocSize(type);
1267
1268  if (CV->isNullValue() || isa<UndefValue>(CV)) {
1269    EmitZeros(Size, AddrSpace);
1270    return;
1271  } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
1272    EmitGlobalConstantArray(CVA , AddrSpace);
1273    return;
1274  } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
1275    EmitGlobalConstantStruct(CVS, AddrSpace);
1276    return;
1277  } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
1278    EmitGlobalConstantFP(CFP, AddrSpace);
1279    return;
1280  } else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1281    // Small integers are handled below; large integers are handled here.
1282    if (Size > 4) {
1283      EmitGlobalConstantLargeInt(CI, AddrSpace);
1284      return;
1285    }
1286  } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) {
1287    EmitGlobalConstantVector(CP);
1288    return;
1289  }
1290
1291  printDataDirective(type, AddrSpace);
1292  EmitConstantValueOnly(CV);
1293  if (VerboseAsm) {
1294    if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1295      SmallString<40> S;
1296      CI->getValue().toStringUnsigned(S, 16);
1297      O << "\t\t\t" << TAI->getCommentString() << " 0x" << S.c_str();
1298    }
1299  }
1300  O << '\n';
1301}
1302
1303void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1304  // Target doesn't support this yet!
1305  llvm_unreachable("Target does not support EmitMachineConstantPoolValue");
1306}
1307
1308/// PrintSpecial - Print information related to the specified machine instr
1309/// that is independent of the operand, and may be independent of the instr
1310/// itself.  This can be useful for portably encoding the comment character
1311/// or other bits of target-specific knowledge into the asmstrings.  The
1312/// syntax used is ${:comment}.  Targets can override this to add support
1313/// for their own strange codes.
1314void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) const {
1315  if (!strcmp(Code, "private")) {
1316    O << TAI->getPrivateGlobalPrefix();
1317  } else if (!strcmp(Code, "comment")) {
1318    if (VerboseAsm)
1319      O << TAI->getCommentString();
1320  } else if (!strcmp(Code, "uid")) {
1321    // Comparing the address of MI isn't sufficient, because machineinstrs may
1322    // be allocated to the same address across functions.
1323    const Function *ThisF = MI->getParent()->getParent()->getFunction();
1324
1325    // If this is a new LastFn instruction, bump the counter.
1326    if (LastMI != MI || LastFn != ThisF) {
1327      ++Counter;
1328      LastMI = MI;
1329      LastFn = ThisF;
1330    }
1331    O << Counter;
1332  } else {
1333    std::string msg;
1334    raw_string_ostream Msg(msg);
1335    Msg << "Unknown special formatter '" << Code
1336         << "' for machine instr: " << *MI;
1337    llvm_report_error(Msg.str());
1338  }
1339}
1340
1341/// processDebugLoc - Processes the debug information of each machine
1342/// instruction's DebugLoc.
1343void AsmPrinter::processDebugLoc(DebugLoc DL) {
1344  if (TAI->doesSupportDebugInformation() && DW->ShouldEmitDwarfDebug()) {
1345    if (!DL.isUnknown()) {
1346      DebugLocTuple CurDLT = MF->getDebugLocTuple(DL);
1347
1348      if (CurDLT.CompileUnit != 0 && PrevDLT != CurDLT)
1349        printLabel(DW->RecordSourceLine(CurDLT.Line, CurDLT.Col,
1350                                        DICompileUnit(CurDLT.CompileUnit)));
1351
1352      PrevDLT = CurDLT;
1353    }
1354  }
1355}
1356
1357/// printInlineAsm - This method formats and prints the specified machine
1358/// instruction that is an inline asm.
1359void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1360  unsigned NumOperands = MI->getNumOperands();
1361
1362  // Count the number of register definitions.
1363  unsigned NumDefs = 0;
1364  for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
1365       ++NumDefs)
1366    assert(NumDefs != NumOperands-1 && "No asm string?");
1367
1368  assert(MI->getOperand(NumDefs).isSymbol() && "No asm string?");
1369
1370  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1371  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1372
1373  // If this asmstr is empty, just print the #APP/#NOAPP markers.
1374  // These are useful to see where empty asm's wound up.
1375  if (AsmStr[0] == 0) {
1376    O << TAI->getInlineAsmStart() << "\n\t" << TAI->getInlineAsmEnd() << '\n';
1377    return;
1378  }
1379
1380  O << TAI->getInlineAsmStart() << "\n\t";
1381
1382  // The variant of the current asmprinter.
1383  int AsmPrinterVariant = TAI->getAssemblerDialect();
1384
1385  int CurVariant = -1;            // The number of the {.|.|.} region we are in.
1386  const char *LastEmitted = AsmStr; // One past the last character emitted.
1387
1388  while (*LastEmitted) {
1389    switch (*LastEmitted) {
1390    default: {
1391      // Not a special case, emit the string section literally.
1392      const char *LiteralEnd = LastEmitted+1;
1393      while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1394             *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1395        ++LiteralEnd;
1396      if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1397        O.write(LastEmitted, LiteralEnd-LastEmitted);
1398      LastEmitted = LiteralEnd;
1399      break;
1400    }
1401    case '\n':
1402      ++LastEmitted;   // Consume newline character.
1403      O << '\n';       // Indent code with newline.
1404      break;
1405    case '$': {
1406      ++LastEmitted;   // Consume '$' character.
1407      bool Done = true;
1408
1409      // Handle escapes.
1410      switch (*LastEmitted) {
1411      default: Done = false; break;
1412      case '$':     // $$ -> $
1413        if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1414          O << '$';
1415        ++LastEmitted;  // Consume second '$' character.
1416        break;
1417      case '(':             // $( -> same as GCC's { character.
1418        ++LastEmitted;      // Consume '(' character.
1419        if (CurVariant != -1) {
1420          llvm_report_error("Nested variants found in inline asm string: '"
1421                            + std::string(AsmStr) + "'");
1422        }
1423        CurVariant = 0;     // We're in the first variant now.
1424        break;
1425      case '|':
1426        ++LastEmitted;  // consume '|' character.
1427        if (CurVariant == -1)
1428          O << '|';       // this is gcc's behavior for | outside a variant
1429        else
1430          ++CurVariant;   // We're in the next variant.
1431        break;
1432      case ')':         // $) -> same as GCC's } char.
1433        ++LastEmitted;  // consume ')' character.
1434        if (CurVariant == -1)
1435          O << '}';     // this is gcc's behavior for } outside a variant
1436        else
1437          CurVariant = -1;
1438        break;
1439      }
1440      if (Done) break;
1441
1442      bool HasCurlyBraces = false;
1443      if (*LastEmitted == '{') {     // ${variable}
1444        ++LastEmitted;               // Consume '{' character.
1445        HasCurlyBraces = true;
1446      }
1447
1448      // If we have ${:foo}, then this is not a real operand reference, it is a
1449      // "magic" string reference, just like in .td files.  Arrange to call
1450      // PrintSpecial.
1451      if (HasCurlyBraces && *LastEmitted == ':') {
1452        ++LastEmitted;
1453        const char *StrStart = LastEmitted;
1454        const char *StrEnd = strchr(StrStart, '}');
1455        if (StrEnd == 0) {
1456          llvm_report_error("Unterminated ${:foo} operand in inline asm string: '"
1457                            + std::string(AsmStr) + "'");
1458        }
1459
1460        std::string Val(StrStart, StrEnd);
1461        PrintSpecial(MI, Val.c_str());
1462        LastEmitted = StrEnd+1;
1463        break;
1464      }
1465
1466      const char *IDStart = LastEmitted;
1467      char *IDEnd;
1468      errno = 0;
1469      long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1470      if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1471        llvm_report_error("Bad $ operand number in inline asm string: '"
1472                          + std::string(AsmStr) + "'");
1473      }
1474      LastEmitted = IDEnd;
1475
1476      char Modifier[2] = { 0, 0 };
1477
1478      if (HasCurlyBraces) {
1479        // If we have curly braces, check for a modifier character.  This
1480        // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1481        if (*LastEmitted == ':') {
1482          ++LastEmitted;    // Consume ':' character.
1483          if (*LastEmitted == 0) {
1484            llvm_report_error("Bad ${:} expression in inline asm string: '"
1485                              + std::string(AsmStr) + "'");
1486          }
1487
1488          Modifier[0] = *LastEmitted;
1489          ++LastEmitted;    // Consume modifier character.
1490        }
1491
1492        if (*LastEmitted != '}') {
1493          llvm_report_error("Bad ${} expression in inline asm string: '"
1494                            + std::string(AsmStr) + "'");
1495        }
1496        ++LastEmitted;    // Consume '}' character.
1497      }
1498
1499      if ((unsigned)Val >= NumOperands-1) {
1500        llvm_report_error("Invalid $ operand number in inline asm string: '"
1501                          + std::string(AsmStr) + "'");
1502      }
1503
1504      // Okay, we finally have a value number.  Ask the target to print this
1505      // operand!
1506      if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1507        unsigned OpNo = 1;
1508
1509        bool Error = false;
1510
1511        // Scan to find the machine operand number for the operand.
1512        for (; Val; --Val) {
1513          if (OpNo >= MI->getNumOperands()) break;
1514          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1515          OpNo += InlineAsm::getNumOperandRegisters(OpFlags) + 1;
1516        }
1517
1518        if (OpNo >= MI->getNumOperands()) {
1519          Error = true;
1520        } else {
1521          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1522          ++OpNo;  // Skip over the ID number.
1523
1524          if (Modifier[0]=='l')  // labels are target independent
1525            printBasicBlockLabel(MI->getOperand(OpNo).getMBB(),
1526                                 false, false, false);
1527          else {
1528            AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1529            if ((OpFlags & 7) == 4) {
1530              Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1531                                                Modifier[0] ? Modifier : 0);
1532            } else {
1533              Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1534                                          Modifier[0] ? Modifier : 0);
1535            }
1536          }
1537        }
1538        if (Error) {
1539          std::string msg;
1540          raw_string_ostream Msg(msg);
1541          Msg << "Invalid operand found in inline asm: '"
1542               << AsmStr << "'\n";
1543          MI->print(Msg);
1544          llvm_report_error(Msg.str());
1545        }
1546      }
1547      break;
1548    }
1549    }
1550  }
1551  O << "\n\t" << TAI->getInlineAsmEnd() << '\n';
1552}
1553
1554/// printImplicitDef - This method prints the specified machine instruction
1555/// that is an implicit def.
1556void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1557  if (VerboseAsm)
1558    O << '\t' << TAI->getCommentString() << " implicit-def: "
1559      << TRI->getAsmName(MI->getOperand(0).getReg()) << '\n';
1560}
1561
1562/// printLabel - This method prints a local label used by debug and
1563/// exception handling tables.
1564void AsmPrinter::printLabel(const MachineInstr *MI) const {
1565  printLabel(MI->getOperand(0).getImm());
1566}
1567
1568void AsmPrinter::printLabel(unsigned Id) const {
1569  O << TAI->getPrivateGlobalPrefix() << "label" << Id << ":\n";
1570}
1571
1572/// printDeclare - This method prints a local variable declaration used by
1573/// debug tables.
1574/// FIXME: It doesn't really print anything rather it inserts a DebugVariable
1575/// entry into dwarf table.
1576void AsmPrinter::printDeclare(const MachineInstr *MI) const {
1577  unsigned FI = MI->getOperand(0).getIndex();
1578  GlobalValue *GV = MI->getOperand(1).getGlobal();
1579  DW->RecordVariable(cast<GlobalVariable>(GV), FI, MI);
1580}
1581
1582/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1583/// instruction, using the specified assembler variant.  Targets should
1584/// overried this to format as appropriate.
1585bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1586                                 unsigned AsmVariant, const char *ExtraCode) {
1587  // Target doesn't support this yet!
1588  return true;
1589}
1590
1591bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1592                                       unsigned AsmVariant,
1593                                       const char *ExtraCode) {
1594  // Target doesn't support this yet!
1595  return true;
1596}
1597
1598/// printBasicBlockLabel - This method prints the label for the specified
1599/// MachineBasicBlock
1600void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB,
1601                                      bool printAlign,
1602                                      bool printColon,
1603                                      bool printComment) const {
1604  if (printAlign) {
1605    unsigned Align = MBB->getAlignment();
1606    if (Align)
1607      EmitAlignment(Log2_32(Align));
1608  }
1609
1610  O << TAI->getPrivateGlobalPrefix() << "BB" << getFunctionNumber() << '_'
1611    << MBB->getNumber();
1612  if (printColon)
1613    O << ':';
1614  if (printComment && MBB->getBasicBlock())
1615    O << '\t' << TAI->getCommentString() << ' '
1616      << MBB->getBasicBlock()->getNameStart();
1617}
1618
1619/// printPICJumpTableSetLabel - This method prints a set label for the
1620/// specified MachineBasicBlock for a jumptable entry.
1621void AsmPrinter::printPICJumpTableSetLabel(unsigned uid,
1622                                           const MachineBasicBlock *MBB) const {
1623  if (!TAI->getSetDirective())
1624    return;
1625
1626  O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
1627    << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
1628  printBasicBlockLabel(MBB, false, false, false);
1629  O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1630    << '_' << uid << '\n';
1631}
1632
1633void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
1634                                           const MachineBasicBlock *MBB) const {
1635  if (!TAI->getSetDirective())
1636    return;
1637
1638  O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
1639    << getFunctionNumber() << '_' << uid << '_' << uid2
1640    << "_set_" << MBB->getNumber() << ',';
1641  printBasicBlockLabel(MBB, false, false, false);
1642  O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1643    << '_' << uid << '_' << uid2 << '\n';
1644}
1645
1646/// printDataDirective - This method prints the asm directive for the
1647/// specified type.
1648void AsmPrinter::printDataDirective(const Type *type, unsigned AddrSpace) {
1649  const TargetData *TD = TM.getTargetData();
1650  switch (type->getTypeID()) {
1651  case Type::IntegerTyID: {
1652    unsigned BitWidth = cast<IntegerType>(type)->getBitWidth();
1653    if (BitWidth <= 8)
1654      O << TAI->getData8bitsDirective(AddrSpace);
1655    else if (BitWidth <= 16)
1656      O << TAI->getData16bitsDirective(AddrSpace);
1657    else if (BitWidth <= 32)
1658      O << TAI->getData32bitsDirective(AddrSpace);
1659    else if (BitWidth <= 64) {
1660      assert(TAI->getData64bitsDirective(AddrSpace) &&
1661             "Target cannot handle 64-bit constant exprs!");
1662      O << TAI->getData64bitsDirective(AddrSpace);
1663    } else {
1664      llvm_unreachable("Target cannot handle given data directive width!");
1665    }
1666    break;
1667  }
1668  case Type::PointerTyID:
1669    if (TD->getPointerSize() == 8) {
1670      assert(TAI->getData64bitsDirective(AddrSpace) &&
1671             "Target cannot handle 64-bit pointer exprs!");
1672      O << TAI->getData64bitsDirective(AddrSpace);
1673    } else if (TD->getPointerSize() == 2) {
1674      O << TAI->getData16bitsDirective(AddrSpace);
1675    } else if (TD->getPointerSize() == 1) {
1676      O << TAI->getData8bitsDirective(AddrSpace);
1677    } else {
1678      O << TAI->getData32bitsDirective(AddrSpace);
1679    }
1680    break;
1681  case Type::FloatTyID: case Type::DoubleTyID:
1682  case Type::X86_FP80TyID: case Type::FP128TyID: case Type::PPC_FP128TyID:
1683    assert (0 && "Should have already output floating point constant.");
1684  default:
1685    assert (0 && "Can't handle printing this type of thing");
1686    break;
1687  }
1688}
1689
1690void AsmPrinter::printSuffixedName(const char *Name, const char *Suffix,
1691                                   const char *Prefix) {
1692  if (Name[0]=='\"')
1693    O << '\"';
1694  O << TAI->getPrivateGlobalPrefix();
1695  if (Prefix) O << Prefix;
1696  if (Name[0]=='\"')
1697    O << '\"';
1698  if (Name[0]=='\"')
1699    O << Name[1];
1700  else
1701    O << Name;
1702  O << Suffix;
1703  if (Name[0]=='\"')
1704    O << '\"';
1705}
1706
1707void AsmPrinter::printSuffixedName(const std::string &Name, const char* Suffix) {
1708  printSuffixedName(Name.c_str(), Suffix);
1709}
1710
1711void AsmPrinter::printVisibility(const std::string& Name,
1712                                 unsigned Visibility) const {
1713  if (Visibility == GlobalValue::HiddenVisibility) {
1714    if (const char *Directive = TAI->getHiddenDirective())
1715      O << Directive << Name << '\n';
1716  } else if (Visibility == GlobalValue::ProtectedVisibility) {
1717    if (const char *Directive = TAI->getProtectedDirective())
1718      O << Directive << Name << '\n';
1719  }
1720}
1721
1722void AsmPrinter::printOffset(int64_t Offset) const {
1723  if (Offset > 0)
1724    O << '+' << Offset;
1725  else if (Offset < 0)
1726    O << Offset;
1727}
1728
1729GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1730  if (!S->usesMetadata())
1731    return 0;
1732
1733  gcp_iterator GCPI = GCMetadataPrinters.find(S);
1734  if (GCPI != GCMetadataPrinters.end())
1735    return GCPI->second;
1736
1737  const char *Name = S->getName().c_str();
1738
1739  for (GCMetadataPrinterRegistry::iterator
1740         I = GCMetadataPrinterRegistry::begin(),
1741         E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1742    if (strcmp(Name, I->getName()) == 0) {
1743      GCMetadataPrinter *GMP = I->instantiate();
1744      GMP->S = S;
1745      GCMetadataPrinters.insert(std::make_pair(S, GMP));
1746      return GMP;
1747    }
1748
1749  cerr << "no GCMetadataPrinter registered for GC: " << Name << "\n";
1750  llvm_unreachable(0);
1751}
1752
1753/// EmitComments - Pretty-print comments for instructions
1754void AsmPrinter::EmitComments(const MachineInstr &MI) const
1755{
1756  // No comments in MachineInstr yet
1757}
1758
1759/// EmitComments - Pretty-print comments for instructions
1760void AsmPrinter::EmitComments(const MCInst &MI) const
1761{
1762  // No comments in MCInst yet
1763}
1764