AsmPrinter.cpp revision 65a7bd8b8e111c51a51278ab46f1a1c91744441b 
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/Support/Mangler.h"
24#include "llvm/Support/MathExtras.h"
25#include "llvm/Support/Streams.h"
26#include "llvm/Target/TargetAsmInfo.h"
27#include "llvm/Target/TargetData.h"
28#include "llvm/Target/TargetLowering.h"
29#include "llvm/Target/TargetMachine.h"
30#include "llvm/Target/TargetOptions.h"
31#include "llvm/Target/TargetRegisterInfo.h"
32#include "llvm/ADT/SmallPtrSet.h"
33#include "llvm/ADT/SmallString.h"
34#include <cerrno>
35using namespace llvm;
36
37char AsmPrinter::ID = 0;
38AsmPrinter::AsmPrinter(std::ostream &o, TargetMachine &tm,
39                       const TargetAsmInfo *T)
40  : MachineFunctionPass((intptr_t)&ID), FunctionNumber(0), O(o),
41    TM(tm), TAI(T), TRI(tm.getRegisterInfo()),
42    IsInTextSection(false)
43{}
44
45AsmPrinter::~AsmPrinter() {
46  for (gcp_iterator I = GCMetadataPrinters.begin(),
47                    E = GCMetadataPrinters.end(); I != E; ++I)
48    delete I->second;
49}
50
51std::string AsmPrinter::getSectionForFunction(const Function &F) const {
52  return TAI->getTextSection();
53}
54
55
56/// SwitchToTextSection - Switch to the specified text section of the executable
57/// if we are not already in it!
58///
59void AsmPrinter::SwitchToTextSection(const char *NewSection,
60                                     const GlobalValue *GV) {
61  std::string NS;
62  if (GV && GV->hasSection())
63    NS = TAI->getSwitchToSectionDirective() + GV->getSection();
64  else
65    NS = NewSection;
66
67  // If we're already in this section, we're done.
68  if (CurrentSection == NS) return;
69
70  // Close the current section, if applicable.
71  if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
72    O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n';
73
74  CurrentSection = NS;
75
76  if (!CurrentSection.empty())
77    O << CurrentSection << TAI->getTextSectionStartSuffix() << '\n';
78
79  IsInTextSection = true;
80}
81
82/// SwitchToDataSection - Switch to the specified data section of the executable
83/// if we are not already in it!
84///
85void AsmPrinter::SwitchToDataSection(const char *NewSection,
86                                     const GlobalValue *GV) {
87  std::string NS;
88  if (GV && GV->hasSection())
89    NS = TAI->getSwitchToSectionDirective() + GV->getSection();
90  else
91    NS = NewSection;
92
93  // If we're already in this section, we're done.
94  if (CurrentSection == NS) return;
95
96  // Close the current section, if applicable.
97  if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
98    O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n';
99
100  CurrentSection = NS;
101
102  if (!CurrentSection.empty())
103    O << CurrentSection << TAI->getDataSectionStartSuffix() << '\n';
104
105  IsInTextSection = false;
106}
107
108
109void AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const {
110  MachineFunctionPass::getAnalysisUsage(AU);
111  AU.addRequired<GCModuleInfo>();
112}
113
114bool AsmPrinter::doInitialization(Module &M) {
115  Mang = new Mangler(M, TAI->getGlobalPrefix());
116
117  GCModuleInfo *MI = getAnalysisToUpdate<GCModuleInfo>();
118  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
119  for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
120    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
121      MP->beginAssembly(O, *this, *TAI);
122
123  if (!M.getModuleInlineAsm().empty())
124    O << TAI->getCommentString() << " Start of file scope inline assembly\n"
125      << M.getModuleInlineAsm()
126      << '\n' << TAI->getCommentString()
127      << " End of file scope inline assembly\n";
128
129  SwitchToDataSection("");   // Reset back to no section.
130
131  MMI = getAnalysisToUpdate<MachineModuleInfo>();
132  if (MMI) MMI->AnalyzeModule(M);
133
134  return false;
135}
136
137bool AsmPrinter::doFinalization(Module &M) {
138  if (TAI->getWeakRefDirective()) {
139    if (!ExtWeakSymbols.empty())
140      SwitchToDataSection("");
141
142    for (std::set<const GlobalValue*>::iterator i = ExtWeakSymbols.begin(),
143         e = ExtWeakSymbols.end(); i != e; ++i) {
144      const GlobalValue *GV = *i;
145      std::string Name = Mang->getValueName(GV);
146      O << TAI->getWeakRefDirective() << Name << '\n';
147    }
148  }
149
150  if (TAI->getSetDirective()) {
151    if (!M.alias_empty())
152      SwitchToTextSection(TAI->getTextSection());
153
154    O << '\n';
155    for (Module::const_alias_iterator I = M.alias_begin(), E = M.alias_end();
156         I!=E; ++I) {
157      std::string Name = Mang->getValueName(I);
158      std::string Target;
159
160      const GlobalValue *GV = cast<GlobalValue>(I->getAliasedGlobal());
161      Target = Mang->getValueName(GV);
162
163      if (I->hasExternalLinkage() || !TAI->getWeakRefDirective())
164        O << "\t.globl\t" << Name << '\n';
165      else if (I->hasWeakLinkage())
166        O << TAI->getWeakRefDirective() << Name << '\n';
167      else if (!I->hasInternalLinkage())
168        assert(0 && "Invalid alias linkage");
169
170      if (I->hasHiddenVisibility()) {
171        if (const char *Directive = TAI->getHiddenDirective())
172          O << Directive << Name << '\n';
173      } else if (I->hasProtectedVisibility()) {
174        if (const char *Directive = TAI->getProtectedDirective())
175          O << Directive << Name << '\n';
176      }
177
178      O << TAI->getSetDirective() << ' ' << Name << ", " << Target << '\n';
179
180      // If the aliasee has external weak linkage it can be referenced only by
181      // alias itself. In this case it can be not in ExtWeakSymbols list. Emit
182      // weak reference in such case.
183      if (GV->hasExternalWeakLinkage()) {
184        if (TAI->getWeakRefDirective())
185          O << TAI->getWeakRefDirective() << Target << '\n';
186        else
187          O << "\t.globl\t" << Target << '\n';
188      }
189    }
190  }
191
192  GCModuleInfo *MI = getAnalysisToUpdate<GCModuleInfo>();
193  assert(MI && "AsmPrinter didn't require GCModuleInfo?");
194  for (GCModuleInfo::iterator I = MI->end(), E = MI->begin(); I != E; )
195    if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*--I))
196      MP->finishAssembly(O, *this, *TAI);
197
198  // If we don't have any trampolines, then we don't require stack memory
199  // to be executable. Some targets have a directive to declare this.
200  Function* InitTrampolineIntrinsic = M.getFunction("llvm.init.trampoline");
201  if (!InitTrampolineIntrinsic || InitTrampolineIntrinsic->use_empty())
202    if (TAI->getNonexecutableStackDirective())
203      O << TAI->getNonexecutableStackDirective() << '\n';
204
205  delete Mang; Mang = 0;
206  return false;
207}
208
209std::string AsmPrinter::getCurrentFunctionEHName(const MachineFunction *MF) {
210  assert(MF && "No machine function?");
211  std::string Name = MF->getFunction()->getName();
212  if (Name.empty())
213    Name = Mang->getValueName(MF->getFunction());
214  return Mang->makeNameProper(Name + ".eh", TAI->getGlobalPrefix());
215}
216
217void AsmPrinter::SetupMachineFunction(MachineFunction &MF) {
218  // What's my mangled name?
219  CurrentFnName = Mang->getValueName(MF.getFunction());
220  IncrementFunctionNumber();
221}
222
223/// EmitConstantPool - Print to the current output stream assembly
224/// representations of the constants in the constant pool MCP. This is
225/// used to print out constants which have been "spilled to memory" by
226/// the code generator.
227///
228void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
229  const std::vector<MachineConstantPoolEntry> &CP = MCP->getConstants();
230  if (CP.empty()) return;
231
232  // Some targets require 4-, 8-, and 16- byte constant literals to be placed
233  // in special sections.
234  std::vector<std::pair<MachineConstantPoolEntry,unsigned> > FourByteCPs;
235  std::vector<std::pair<MachineConstantPoolEntry,unsigned> > EightByteCPs;
236  std::vector<std::pair<MachineConstantPoolEntry,unsigned> > SixteenByteCPs;
237  std::vector<std::pair<MachineConstantPoolEntry,unsigned> > OtherCPs;
238  std::vector<std::pair<MachineConstantPoolEntry,unsigned> > TargetCPs;
239  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
240    MachineConstantPoolEntry CPE = CP[i];
241    const Type *Ty = CPE.getType();
242    if (TAI->getFourByteConstantSection() &&
243        TM.getTargetData()->getABITypeSize(Ty) == 4)
244      FourByteCPs.push_back(std::make_pair(CPE, i));
245    else if (TAI->getEightByteConstantSection() &&
246             TM.getTargetData()->getABITypeSize(Ty) == 8)
247      EightByteCPs.push_back(std::make_pair(CPE, i));
248    else if (TAI->getSixteenByteConstantSection() &&
249             TM.getTargetData()->getABITypeSize(Ty) == 16)
250      SixteenByteCPs.push_back(std::make_pair(CPE, i));
251    else
252      OtherCPs.push_back(std::make_pair(CPE, i));
253  }
254
255  unsigned Alignment = MCP->getConstantPoolAlignment();
256  EmitConstantPool(Alignment, TAI->getFourByteConstantSection(), FourByteCPs);
257  EmitConstantPool(Alignment, TAI->getEightByteConstantSection(), EightByteCPs);
258  EmitConstantPool(Alignment, TAI->getSixteenByteConstantSection(),
259                   SixteenByteCPs);
260  EmitConstantPool(Alignment, TAI->getConstantPoolSection(), OtherCPs);
261}
262
263void AsmPrinter::EmitConstantPool(unsigned Alignment, const char *Section,
264               std::vector<std::pair<MachineConstantPoolEntry,unsigned> > &CP) {
265  if (CP.empty()) return;
266
267  SwitchToDataSection(Section);
268  EmitAlignment(Alignment);
269  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
270    O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_'
271      << CP[i].second << ":\t\t\t\t\t" << TAI->getCommentString() << ' ';
272    WriteTypeSymbolic(O, CP[i].first.getType(), 0);
273    O << '\n';
274    if (CP[i].first.isMachineConstantPoolEntry())
275      EmitMachineConstantPoolValue(CP[i].first.Val.MachineCPVal);
276     else
277      EmitGlobalConstant(CP[i].first.Val.ConstVal);
278    if (i != e-1) {
279      const Type *Ty = CP[i].first.getType();
280      unsigned EntSize =
281        TM.getTargetData()->getABITypeSize(Ty);
282      unsigned ValEnd = CP[i].first.getOffset() + EntSize;
283      // Emit inter-object padding for alignment.
284      EmitZeros(CP[i+1].first.getOffset()-ValEnd);
285    }
286  }
287}
288
289/// EmitJumpTableInfo - Print assembly representations of the jump tables used
290/// by the current function to the current output stream.
291///
292void AsmPrinter::EmitJumpTableInfo(MachineJumpTableInfo *MJTI,
293                                   MachineFunction &MF) {
294  const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
295  if (JT.empty()) return;
296
297  bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
298
299  // Pick the directive to use to print the jump table entries, and switch to
300  // the appropriate section.
301  TargetLowering *LoweringInfo = TM.getTargetLowering();
302
303  const char* JumpTableDataSection = TAI->getJumpTableDataSection();
304  const Function *F = MF.getFunction();
305  unsigned SectionFlags = TAI->SectionFlagsForGlobal(F);
306  if ((IsPic && !(LoweringInfo && LoweringInfo->usesGlobalOffsetTable())) ||
307     !JumpTableDataSection ||
308      SectionFlags & SectionFlags::Linkonce) {
309    // In PIC mode, we need to emit the jump table to the same section as the
310    // function body itself, otherwise the label differences won't make sense.
311    // We should also do if the section name is NULL or function is declared in
312    // discardable section.
313    SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
314  } else {
315    SwitchToDataSection(JumpTableDataSection);
316  }
317
318  EmitAlignment(Log2_32(MJTI->getAlignment()));
319
320  for (unsigned i = 0, e = JT.size(); i != e; ++i) {
321    const std::vector<MachineBasicBlock*> &JTBBs = JT[i].MBBs;
322
323    // If this jump table was deleted, ignore it.
324    if (JTBBs.empty()) continue;
325
326    // For PIC codegen, if possible we want to use the SetDirective to reduce
327    // the number of relocations the assembler will generate for the jump table.
328    // Set directives are all printed before the jump table itself.
329    SmallPtrSet<MachineBasicBlock*, 16> EmittedSets;
330    if (TAI->getSetDirective() && IsPic)
331      for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii)
332        if (EmittedSets.insert(JTBBs[ii]))
333          printPICJumpTableSetLabel(i, JTBBs[ii]);
334
335    // On some targets (e.g. darwin) we want to emit two consequtive labels
336    // before each jump table.  The first label is never referenced, but tells
337    // the assembler and linker the extents of the jump table object.  The
338    // second label is actually referenced by the code.
339    if (const char *JTLabelPrefix = TAI->getJumpTableSpecialLabelPrefix())
340      O << JTLabelPrefix << "JTI" << getFunctionNumber() << '_' << i << ":\n";
341
342    O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
343      << '_' << i << ":\n";
344
345    for (unsigned ii = 0, ee = JTBBs.size(); ii != ee; ++ii) {
346      printPICJumpTableEntry(MJTI, JTBBs[ii], i);
347      O << '\n';
348    }
349  }
350}
351
352void AsmPrinter::printPICJumpTableEntry(const MachineJumpTableInfo *MJTI,
353                                        const MachineBasicBlock *MBB,
354                                        unsigned uid)  const {
355  bool IsPic = TM.getRelocationModel() == Reloc::PIC_;
356
357  // Use JumpTableDirective otherwise honor the entry size from the jump table
358  // info.
359  const char *JTEntryDirective = TAI->getJumpTableDirective();
360  bool HadJTEntryDirective = JTEntryDirective != NULL;
361  if (!HadJTEntryDirective) {
362    JTEntryDirective = MJTI->getEntrySize() == 4 ?
363      TAI->getData32bitsDirective() : TAI->getData64bitsDirective();
364  }
365
366  O << JTEntryDirective << ' ';
367
368  // If we have emitted set directives for the jump table entries, print
369  // them rather than the entries themselves.  If we're emitting PIC, then
370  // emit the table entries as differences between two text section labels.
371  // If we're emitting non-PIC code, then emit the entries as direct
372  // references to the target basic blocks.
373  if (IsPic) {
374    if (TAI->getSetDirective()) {
375      O << TAI->getPrivateGlobalPrefix() << getFunctionNumber()
376        << '_' << uid << "_set_" << MBB->getNumber();
377    } else {
378      printBasicBlockLabel(MBB, false, false, false);
379      // If the arch uses custom Jump Table directives, don't calc relative to
380      // JT
381      if (!HadJTEntryDirective)
382        O << '-' << TAI->getPrivateGlobalPrefix() << "JTI"
383          << getFunctionNumber() << '_' << uid;
384    }
385  } else {
386    printBasicBlockLabel(MBB, false, false, false);
387  }
388}
389
390
391/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
392/// special global used by LLVM.  If so, emit it and return true, otherwise
393/// do nothing and return false.
394bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
395  if (GV->getName() == "llvm.used") {
396    if (TAI->getUsedDirective() != 0)    // No need to emit this at all.
397      EmitLLVMUsedList(GV->getInitializer());
398    return true;
399  }
400
401  // Ignore debug and non-emitted data.
402  if (GV->getSection() == "llvm.metadata") return true;
403
404  if (!GV->hasAppendingLinkage()) return false;
405
406  assert(GV->hasInitializer() && "Not a special LLVM global!");
407
408  const TargetData *TD = TM.getTargetData();
409  unsigned Align = Log2_32(TD->getPointerPrefAlignment());
410  if (GV->getName() == "llvm.global_ctors" && GV->use_empty()) {
411    SwitchToDataSection(TAI->getStaticCtorsSection());
412    EmitAlignment(Align, 0);
413    EmitXXStructorList(GV->getInitializer());
414    return true;
415  }
416
417  if (GV->getName() == "llvm.global_dtors" && GV->use_empty()) {
418    SwitchToDataSection(TAI->getStaticDtorsSection());
419    EmitAlignment(Align, 0);
420    EmitXXStructorList(GV->getInitializer());
421    return true;
422  }
423
424  return false;
425}
426
427/// EmitLLVMUsedList - For targets that define a TAI::UsedDirective, mark each
428/// global in the specified llvm.used list as being used with this directive.
429void AsmPrinter::EmitLLVMUsedList(Constant *List) {
430  const char *Directive = TAI->getUsedDirective();
431
432  // Should be an array of 'sbyte*'.
433  ConstantArray *InitList = dyn_cast<ConstantArray>(List);
434  if (InitList == 0) return;
435
436  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) {
437    O << Directive;
438    EmitConstantValueOnly(InitList->getOperand(i));
439    O << '\n';
440  }
441}
442
443/// EmitXXStructorList - Emit the ctor or dtor list.  This just prints out the
444/// function pointers, ignoring the init priority.
445void AsmPrinter::EmitXXStructorList(Constant *List) {
446  // Should be an array of '{ int, void ()* }' structs.  The first value is the
447  // init priority, which we ignore.
448  if (!isa<ConstantArray>(List)) return;
449  ConstantArray *InitList = cast<ConstantArray>(List);
450  for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
451    if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
452      if (CS->getNumOperands() != 2) return;  // Not array of 2-element structs.
453
454      if (CS->getOperand(1)->isNullValue())
455        return;  // Found a null terminator, exit printing.
456      // Emit the function pointer.
457      EmitGlobalConstant(CS->getOperand(1));
458    }
459}
460
461/// getGlobalLinkName - Returns the asm/link name of of the specified
462/// global variable.  Should be overridden by each target asm printer to
463/// generate the appropriate value.
464const std::string AsmPrinter::getGlobalLinkName(const GlobalVariable *GV) const{
465  std::string LinkName;
466
467  if (isa<Function>(GV)) {
468    LinkName += TAI->getFunctionAddrPrefix();
469    LinkName += Mang->getValueName(GV);
470    LinkName += TAI->getFunctionAddrSuffix();
471  } else {
472    LinkName += TAI->getGlobalVarAddrPrefix();
473    LinkName += Mang->getValueName(GV);
474    LinkName += TAI->getGlobalVarAddrSuffix();
475  }
476
477  return LinkName;
478}
479
480/// EmitExternalGlobal - Emit the external reference to a global variable.
481/// Should be overridden if an indirect reference should be used.
482void AsmPrinter::EmitExternalGlobal(const GlobalVariable *GV) {
483  O << getGlobalLinkName(GV);
484}
485
486
487
488//===----------------------------------------------------------------------===//
489/// LEB 128 number encoding.
490
491/// PrintULEB128 - Print a series of hexidecimal values (separated by commas)
492/// representing an unsigned leb128 value.
493void AsmPrinter::PrintULEB128(unsigned Value) const {
494  do {
495    unsigned Byte = Value & 0x7f;
496    Value >>= 7;
497    if (Value) Byte |= 0x80;
498    O << "0x" << std::hex << Byte << std::dec;
499    if (Value) O << ", ";
500  } while (Value);
501}
502
503/// PrintSLEB128 - Print a series of hexidecimal values (separated by commas)
504/// representing a signed leb128 value.
505void AsmPrinter::PrintSLEB128(int Value) const {
506  int Sign = Value >> (8 * sizeof(Value) - 1);
507  bool IsMore;
508
509  do {
510    unsigned Byte = Value & 0x7f;
511    Value >>= 7;
512    IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
513    if (IsMore) Byte |= 0x80;
514    O << "0x" << std::hex << Byte << std::dec;
515    if (IsMore) O << ", ";
516  } while (IsMore);
517}
518
519//===--------------------------------------------------------------------===//
520// Emission and print routines
521//
522
523/// PrintHex - Print a value as a hexidecimal value.
524///
525void AsmPrinter::PrintHex(int Value) const {
526  O << "0x" << std::hex << Value << std::dec;
527}
528
529/// EOL - Print a newline character to asm stream.  If a comment is present
530/// then it will be printed first.  Comments should not contain '\n'.
531void AsmPrinter::EOL() const {
532  O << '\n';
533}
534
535void AsmPrinter::EOL(const std::string &Comment) const {
536  if (VerboseAsm && !Comment.empty()) {
537    O << '\t'
538      << TAI->getCommentString()
539      << ' '
540      << Comment;
541  }
542  O << '\n';
543}
544
545void AsmPrinter::EOL(const char* Comment) const {
546  if (VerboseAsm && *Comment) {
547    O << '\t'
548      << TAI->getCommentString()
549      << ' '
550      << Comment;
551  }
552  O << '\n';
553}
554
555/// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
556/// unsigned leb128 value.
557void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
558  if (TAI->hasLEB128()) {
559    O << "\t.uleb128\t"
560      << Value;
561  } else {
562    O << TAI->getData8bitsDirective();
563    PrintULEB128(Value);
564  }
565}
566
567/// EmitSLEB128Bytes - print an assembler byte data directive to compose a
568/// signed leb128 value.
569void AsmPrinter::EmitSLEB128Bytes(int Value) const {
570  if (TAI->hasLEB128()) {
571    O << "\t.sleb128\t"
572      << Value;
573  } else {
574    O << TAI->getData8bitsDirective();
575    PrintSLEB128(Value);
576  }
577}
578
579/// EmitInt8 - Emit a byte directive and value.
580///
581void AsmPrinter::EmitInt8(int Value) const {
582  O << TAI->getData8bitsDirective();
583  PrintHex(Value & 0xFF);
584}
585
586/// EmitInt16 - Emit a short directive and value.
587///
588void AsmPrinter::EmitInt16(int Value) const {
589  O << TAI->getData16bitsDirective();
590  PrintHex(Value & 0xFFFF);
591}
592
593/// EmitInt32 - Emit a long directive and value.
594///
595void AsmPrinter::EmitInt32(int Value) const {
596  O << TAI->getData32bitsDirective();
597  PrintHex(Value);
598}
599
600/// EmitInt64 - Emit a long long directive and value.
601///
602void AsmPrinter::EmitInt64(uint64_t Value) const {
603  if (TAI->getData64bitsDirective()) {
604    O << TAI->getData64bitsDirective();
605    PrintHex(Value);
606  } else {
607    if (TM.getTargetData()->isBigEndian()) {
608      EmitInt32(unsigned(Value >> 32)); O << '\n';
609      EmitInt32(unsigned(Value));
610    } else {
611      EmitInt32(unsigned(Value)); O << '\n';
612      EmitInt32(unsigned(Value >> 32));
613    }
614  }
615}
616
617/// toOctal - Convert the low order bits of X into an octal digit.
618///
619static inline char toOctal(int X) {
620  return (X&7)+'0';
621}
622
623/// printStringChar - Print a char, escaped if necessary.
624///
625static void printStringChar(std::ostream &O, unsigned char C) {
626  if (C == '"') {
627    O << "\\\"";
628  } else if (C == '\\') {
629    O << "\\\\";
630  } else if (isprint(C)) {
631    O << C;
632  } else {
633    switch(C) {
634    case '\b': O << "\\b"; break;
635    case '\f': O << "\\f"; break;
636    case '\n': O << "\\n"; break;
637    case '\r': O << "\\r"; break;
638    case '\t': O << "\\t"; break;
639    default:
640      O << '\\';
641      O << toOctal(C >> 6);
642      O << toOctal(C >> 3);
643      O << toOctal(C >> 0);
644      break;
645    }
646  }
647}
648
649/// EmitString - Emit a string with quotes and a null terminator.
650/// Special characters are emitted properly.
651/// \literal (Eg. '\t') \endliteral
652void AsmPrinter::EmitString(const std::string &String) const {
653  const char* AscizDirective = TAI->getAscizDirective();
654  if (AscizDirective)
655    O << AscizDirective;
656  else
657    O << TAI->getAsciiDirective();
658  O << '\"';
659  for (unsigned i = 0, N = String.size(); i < N; ++i) {
660    unsigned char C = String[i];
661    printStringChar(O, C);
662  }
663  if (AscizDirective)
664    O << '\"';
665  else
666    O << "\\0\"";
667}
668
669
670/// EmitFile - Emit a .file directive.
671void AsmPrinter::EmitFile(unsigned Number, const std::string &Name) const {
672  O << "\t.file\t" << Number << " \"";
673  for (unsigned i = 0, N = Name.size(); i < N; ++i) {
674    unsigned char C = Name[i];
675    printStringChar(O, C);
676  }
677  O << '\"';
678}
679
680
681//===----------------------------------------------------------------------===//
682
683// EmitAlignment - Emit an alignment directive to the specified power of
684// two boundary.  For example, if you pass in 3 here, you will get an 8
685// byte alignment.  If a global value is specified, and if that global has
686// an explicit alignment requested, it will unconditionally override the
687// alignment request.  However, if ForcedAlignBits is specified, this value
688// has final say: the ultimate alignment will be the max of ForcedAlignBits
689// and the alignment computed with NumBits and the global.
690//
691// The algorithm is:
692//     Align = NumBits;
693//     if (GV && GV->hasalignment) Align = GV->getalignment();
694//     Align = std::max(Align, ForcedAlignBits);
695//
696void AsmPrinter::EmitAlignment(unsigned NumBits, const GlobalValue *GV,
697                               unsigned ForcedAlignBits,
698                               bool UseFillExpr) const {
699  if (GV && GV->getAlignment())
700    NumBits = Log2_32(GV->getAlignment());
701  NumBits = std::max(NumBits, ForcedAlignBits);
702
703  if (NumBits == 0) return;   // No need to emit alignment.
704  if (TAI->getAlignmentIsInBytes()) NumBits = 1 << NumBits;
705  O << TAI->getAlignDirective() << NumBits;
706
707  unsigned FillValue = TAI->getTextAlignFillValue();
708  UseFillExpr &= IsInTextSection && FillValue;
709  if (UseFillExpr) O << ",0x" << std::hex << FillValue << std::dec;
710  O << '\n';
711}
712
713
714/// EmitZeros - Emit a block of zeros.
715///
716void AsmPrinter::EmitZeros(uint64_t NumZeros) const {
717  if (NumZeros) {
718    if (TAI->getZeroDirective()) {
719      O << TAI->getZeroDirective() << NumZeros;
720      if (TAI->getZeroDirectiveSuffix())
721        O << TAI->getZeroDirectiveSuffix();
722      O << '\n';
723    } else {
724      for (; NumZeros; --NumZeros)
725        O << TAI->getData8bitsDirective() << "0\n";
726    }
727  }
728}
729
730// Print out the specified constant, without a storage class.  Only the
731// constants valid in constant expressions can occur here.
732void AsmPrinter::EmitConstantValueOnly(const Constant *CV) {
733  if (CV->isNullValue() || isa<UndefValue>(CV))
734    O << '0';
735  else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
736    O << CI->getZExtValue();
737  } else if (const GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
738    // This is a constant address for a global variable or function. Use the
739    // name of the variable or function as the address value, possibly
740    // decorating it with GlobalVarAddrPrefix/Suffix or
741    // FunctionAddrPrefix/Suffix (these all default to "" )
742    if (isa<Function>(GV)) {
743      O << TAI->getFunctionAddrPrefix()
744        << Mang->getValueName(GV)
745        << TAI->getFunctionAddrSuffix();
746    } else {
747      O << TAI->getGlobalVarAddrPrefix()
748        << Mang->getValueName(GV)
749        << TAI->getGlobalVarAddrSuffix();
750    }
751  } else if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CV)) {
752    const TargetData *TD = TM.getTargetData();
753    unsigned Opcode = CE->getOpcode();
754    switch (Opcode) {
755    case Instruction::GetElementPtr: {
756      // generate a symbolic expression for the byte address
757      const Constant *ptrVal = CE->getOperand(0);
758      SmallVector<Value*, 8> idxVec(CE->op_begin()+1, CE->op_end());
759      if (int64_t Offset = TD->getIndexedOffset(ptrVal->getType(), &idxVec[0],
760                                                idxVec.size())) {
761        if (Offset)
762          O << '(';
763        EmitConstantValueOnly(ptrVal);
764        if (Offset > 0)
765          O << ") + " << Offset;
766        else if (Offset < 0)
767          O << ") - " << -Offset;
768      } else {
769        EmitConstantValueOnly(ptrVal);
770      }
771      break;
772    }
773    case Instruction::Trunc:
774    case Instruction::ZExt:
775    case Instruction::SExt:
776    case Instruction::FPTrunc:
777    case Instruction::FPExt:
778    case Instruction::UIToFP:
779    case Instruction::SIToFP:
780    case Instruction::FPToUI:
781    case Instruction::FPToSI:
782      assert(0 && "FIXME: Don't yet support this kind of constant cast expr");
783      break;
784    case Instruction::BitCast:
785      return EmitConstantValueOnly(CE->getOperand(0));
786
787    case Instruction::IntToPtr: {
788      // Handle casts to pointers by changing them into casts to the appropriate
789      // integer type.  This promotes constant folding and simplifies this code.
790      Constant *Op = CE->getOperand(0);
791      Op = ConstantExpr::getIntegerCast(Op, TD->getIntPtrType(), false/*ZExt*/);
792      return EmitConstantValueOnly(Op);
793    }
794
795
796    case Instruction::PtrToInt: {
797      // Support only foldable casts to/from pointers that can be eliminated by
798      // changing the pointer to the appropriately sized integer type.
799      Constant *Op = CE->getOperand(0);
800      const Type *Ty = CE->getType();
801
802      // We can emit the pointer value into this slot if the slot is an
803      // integer slot greater or equal to the size of the pointer.
804      if (TD->getABITypeSize(Ty) >= TD->getABITypeSize(Op->getType()))
805        return EmitConstantValueOnly(Op);
806
807      O << "((";
808      EmitConstantValueOnly(Op);
809      APInt ptrMask = APInt::getAllOnesValue(TD->getABITypeSizeInBits(Ty));
810
811      SmallString<40> S;
812      ptrMask.toStringUnsigned(S);
813      O << ") & " << S.c_str() << ')';
814      break;
815    }
816    case Instruction::Add:
817    case Instruction::Sub:
818    case Instruction::And:
819    case Instruction::Or:
820    case Instruction::Xor:
821      O << '(';
822      EmitConstantValueOnly(CE->getOperand(0));
823      O << ')';
824      switch (Opcode) {
825      case Instruction::Add:
826       O << " + ";
827       break;
828      case Instruction::Sub:
829       O << " - ";
830       break;
831      case Instruction::And:
832       O << " & ";
833       break;
834      case Instruction::Or:
835       O << " | ";
836       break;
837      case Instruction::Xor:
838       O << " ^ ";
839       break;
840      default:
841       break;
842      }
843      O << '(';
844      EmitConstantValueOnly(CE->getOperand(1));
845      O << ')';
846      break;
847    default:
848      assert(0 && "Unsupported operator!");
849    }
850  } else {
851    assert(0 && "Unknown constant value!");
852  }
853}
854
855/// printAsCString - Print the specified array as a C compatible string, only if
856/// the predicate isString is true.
857///
858static void printAsCString(std::ostream &O, const ConstantArray *CVA,
859                           unsigned LastElt) {
860  assert(CVA->isString() && "Array is not string compatible!");
861
862  O << '\"';
863  for (unsigned i = 0; i != LastElt; ++i) {
864    unsigned char C =
865        (unsigned char)cast<ConstantInt>(CVA->getOperand(i))->getZExtValue();
866    printStringChar(O, C);
867  }
868  O << '\"';
869}
870
871/// EmitString - Emit a zero-byte-terminated string constant.
872///
873void AsmPrinter::EmitString(const ConstantArray *CVA) const {
874  unsigned NumElts = CVA->getNumOperands();
875  if (TAI->getAscizDirective() && NumElts &&
876      cast<ConstantInt>(CVA->getOperand(NumElts-1))->getZExtValue() == 0) {
877    O << TAI->getAscizDirective();
878    printAsCString(O, CVA, NumElts-1);
879  } else {
880    O << TAI->getAsciiDirective();
881    printAsCString(O, CVA, NumElts);
882  }
883  O << '\n';
884}
885
886/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
887void AsmPrinter::EmitGlobalConstant(const Constant *CV) {
888  const TargetData *TD = TM.getTargetData();
889  unsigned Size = TD->getABITypeSize(CV->getType());
890
891  if (CV->isNullValue() || isa<UndefValue>(CV)) {
892    EmitZeros(Size);
893    return;
894  } else if (const ConstantArray *CVA = dyn_cast<ConstantArray>(CV)) {
895    if (CVA->isString()) {
896      EmitString(CVA);
897    } else { // Not a string.  Print the values in successive locations
898      for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i)
899        EmitGlobalConstant(CVA->getOperand(i));
900    }
901    return;
902  } else if (const ConstantStruct *CVS = dyn_cast<ConstantStruct>(CV)) {
903    // Print the fields in successive locations. Pad to align if needed!
904    const StructLayout *cvsLayout = TD->getStructLayout(CVS->getType());
905    uint64_t sizeSoFar = 0;
906    for (unsigned i = 0, e = CVS->getNumOperands(); i != e; ++i) {
907      const Constant* field = CVS->getOperand(i);
908
909      // Check if padding is needed and insert one or more 0s.
910      uint64_t fieldSize = TD->getABITypeSize(field->getType());
911      uint64_t padSize = ((i == e-1 ? Size : cvsLayout->getElementOffset(i+1))
912                          - cvsLayout->getElementOffset(i)) - fieldSize;
913      sizeSoFar += fieldSize + padSize;
914
915      // Now print the actual field value.
916      EmitGlobalConstant(field);
917
918      // Insert padding - this may include padding to increase the size of the
919      // current field up to the ABI size (if the struct is not packed) as well
920      // as padding to ensure that the next field starts at the right offset.
921      EmitZeros(padSize);
922    }
923    assert(sizeSoFar == cvsLayout->getSizeInBytes() &&
924           "Layout of constant struct may be incorrect!");
925    return;
926  } else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
927    // FP Constants are printed as integer constants to avoid losing
928    // precision...
929    if (CFP->getType() == Type::DoubleTy) {
930      double Val = CFP->getValueAPF().convertToDouble();  // for comment only
931      uint64_t i = CFP->getValueAPF().convertToAPInt().getZExtValue();
932      if (TAI->getData64bitsDirective())
933        O << TAI->getData64bitsDirective() << i << '\t'
934          << TAI->getCommentString() << " double value: " << Val << '\n';
935      else if (TD->isBigEndian()) {
936        O << TAI->getData32bitsDirective() << unsigned(i >> 32)
937          << '\t' << TAI->getCommentString()
938          << " double most significant word " << Val << '\n';
939        O << TAI->getData32bitsDirective() << unsigned(i)
940          << '\t' << TAI->getCommentString()
941          << " double least significant word " << Val << '\n';
942      } else {
943        O << TAI->getData32bitsDirective() << unsigned(i)
944          << '\t' << TAI->getCommentString()
945          << " double least significant word " << Val << '\n';
946        O << TAI->getData32bitsDirective() << unsigned(i >> 32)
947          << '\t' << TAI->getCommentString()
948          << " double most significant word " << Val << '\n';
949      }
950      return;
951    } else if (CFP->getType() == Type::FloatTy) {
952      float Val = CFP->getValueAPF().convertToFloat();  // for comment only
953      O << TAI->getData32bitsDirective()
954        << CFP->getValueAPF().convertToAPInt().getZExtValue()
955        << '\t' << TAI->getCommentString() << " float " << Val << '\n';
956      return;
957    } else if (CFP->getType() == Type::X86_FP80Ty) {
958      // all long double variants are printed as hex
959      // api needed to prevent premature destruction
960      APInt api = CFP->getValueAPF().convertToAPInt();
961      const uint64_t *p = api.getRawData();
962      APFloat DoubleVal = CFP->getValueAPF();
963      DoubleVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven);
964      if (TD->isBigEndian()) {
965        O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 48)
966          << '\t' << TAI->getCommentString()
967          << " long double most significant halfword of ~"
968          << DoubleVal.convertToDouble() << '\n';
969        O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 32)
970          << '\t' << TAI->getCommentString()
971          << " long double next halfword\n";
972        O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 16)
973          << '\t' << TAI->getCommentString()
974          << " long double next halfword\n";
975        O << TAI->getData16bitsDirective() << uint16_t(p[0])
976          << '\t' << TAI->getCommentString()
977          << " long double next halfword\n";
978        O << TAI->getData16bitsDirective() << uint16_t(p[1])
979          << '\t' << TAI->getCommentString()
980          << " long double least significant halfword\n";
981       } else {
982        O << TAI->getData16bitsDirective() << uint16_t(p[1])
983          << '\t' << TAI->getCommentString()
984          << " long double least significant halfword of ~"
985          << DoubleVal.convertToDouble() << '\n';
986        O << TAI->getData16bitsDirective() << uint16_t(p[0])
987          << '\t' << TAI->getCommentString()
988          << " long double next halfword\n";
989        O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 16)
990          << '\t' << TAI->getCommentString()
991          << " long double next halfword\n";
992        O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 32)
993          << '\t' << TAI->getCommentString()
994          << " long double next halfword\n";
995        O << TAI->getData16bitsDirective() << uint16_t(p[0] >> 48)
996          << '\t' << TAI->getCommentString()
997          << " long double most significant halfword\n";
998      }
999      EmitZeros(Size - TD->getTypeStoreSize(Type::X86_FP80Ty));
1000      return;
1001    } else if (CFP->getType() == Type::PPC_FP128Ty) {
1002      // all long double variants are printed as hex
1003      // api needed to prevent premature destruction
1004      APInt api = CFP->getValueAPF().convertToAPInt();
1005      const uint64_t *p = api.getRawData();
1006      if (TD->isBigEndian()) {
1007        O << TAI->getData32bitsDirective() << uint32_t(p[0] >> 32)
1008          << '\t' << TAI->getCommentString()
1009          << " long double most significant word\n";
1010        O << TAI->getData32bitsDirective() << uint32_t(p[0])
1011          << '\t' << TAI->getCommentString()
1012          << " long double next word\n";
1013        O << TAI->getData32bitsDirective() << uint32_t(p[1] >> 32)
1014          << '\t' << TAI->getCommentString()
1015          << " long double next word\n";
1016        O << TAI->getData32bitsDirective() << uint32_t(p[1])
1017          << '\t' << TAI->getCommentString()
1018          << " long double least significant word\n";
1019       } else {
1020        O << TAI->getData32bitsDirective() << uint32_t(p[1])
1021          << '\t' << TAI->getCommentString()
1022          << " long double least significant word\n";
1023        O << TAI->getData32bitsDirective() << uint32_t(p[1] >> 32)
1024          << '\t' << TAI->getCommentString()
1025          << " long double next word\n";
1026        O << TAI->getData32bitsDirective() << uint32_t(p[0])
1027          << '\t' << TAI->getCommentString()
1028          << " long double next word\n";
1029        O << TAI->getData32bitsDirective() << uint32_t(p[0] >> 32)
1030          << '\t' << TAI->getCommentString()
1031          << " long double most significant word\n";
1032      }
1033      return;
1034    } else assert(0 && "Floating point constant type not handled");
1035  } else if (CV->getType() == Type::Int64Ty) {
1036    if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1037      uint64_t Val = CI->getZExtValue();
1038
1039      if (TAI->getData64bitsDirective())
1040        O << TAI->getData64bitsDirective() << Val << '\n';
1041      else if (TD->isBigEndian()) {
1042        O << TAI->getData32bitsDirective() << unsigned(Val >> 32)
1043          << '\t' << TAI->getCommentString()
1044          << " Double-word most significant word " << Val << '\n';
1045        O << TAI->getData32bitsDirective() << unsigned(Val)
1046          << '\t' << TAI->getCommentString()
1047          << " Double-word least significant word " << Val << '\n';
1048      } else {
1049        O << TAI->getData32bitsDirective() << unsigned(Val)
1050          << '\t' << TAI->getCommentString()
1051          << " Double-word least significant word " << Val << '\n';
1052        O << TAI->getData32bitsDirective() << unsigned(Val >> 32)
1053          << '\t' << TAI->getCommentString()
1054          << " Double-word most significant word " << Val << '\n';
1055      }
1056      return;
1057    }
1058  } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(CV)) {
1059    const VectorType *PTy = CP->getType();
1060
1061    for (unsigned I = 0, E = PTy->getNumElements(); I < E; ++I)
1062      EmitGlobalConstant(CP->getOperand(I));
1063
1064    return;
1065  }
1066
1067  const Type *type = CV->getType();
1068  printDataDirective(type);
1069  EmitConstantValueOnly(CV);
1070  if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
1071    SmallString<40> S;
1072    CI->getValue().toStringUnsigned(S, 16);
1073    O << "\t\t\t" << TAI->getCommentString() << " 0x" << S.c_str();
1074  }
1075  O << '\n';
1076}
1077
1078void AsmPrinter::EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
1079  // Target doesn't support this yet!
1080  abort();
1081}
1082
1083/// PrintSpecial - Print information related to the specified machine instr
1084/// that is independent of the operand, and may be independent of the instr
1085/// itself.  This can be useful for portably encoding the comment character
1086/// or other bits of target-specific knowledge into the asmstrings.  The
1087/// syntax used is ${:comment}.  Targets can override this to add support
1088/// for their own strange codes.
1089void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) {
1090  if (!strcmp(Code, "private")) {
1091    O << TAI->getPrivateGlobalPrefix();
1092  } else if (!strcmp(Code, "comment")) {
1093    O << TAI->getCommentString();
1094  } else if (!strcmp(Code, "uid")) {
1095    // Assign a unique ID to this machine instruction.
1096    static const MachineInstr *LastMI = 0;
1097    static const Function *F = 0;
1098    static unsigned Counter = 0U-1;
1099
1100    // Comparing the address of MI isn't sufficient, because machineinstrs may
1101    // be allocated to the same address across functions.
1102    const Function *ThisF = MI->getParent()->getParent()->getFunction();
1103
1104    // If this is a new machine instruction, bump the counter.
1105    if (LastMI != MI || F != ThisF) {
1106      ++Counter;
1107      LastMI = MI;
1108      F = ThisF;
1109    }
1110    O << Counter;
1111  } else {
1112    cerr << "Unknown special formatter '" << Code
1113         << "' for machine instr: " << *MI;
1114    exit(1);
1115  }
1116}
1117
1118
1119/// printInlineAsm - This method formats and prints the specified machine
1120/// instruction that is an inline asm.
1121void AsmPrinter::printInlineAsm(const MachineInstr *MI) const {
1122  unsigned NumOperands = MI->getNumOperands();
1123
1124  // Count the number of register definitions.
1125  unsigned NumDefs = 0;
1126  for (; MI->getOperand(NumDefs).isRegister() && MI->getOperand(NumDefs).isDef();
1127       ++NumDefs)
1128    assert(NumDefs != NumOperands-1 && "No asm string?");
1129
1130  assert(MI->getOperand(NumDefs).isExternalSymbol() && "No asm string?");
1131
1132  // Disassemble the AsmStr, printing out the literal pieces, the operands, etc.
1133  const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
1134
1135  // If this asmstr is empty, just print the #APP/#NOAPP markers.
1136  // These are useful to see where empty asm's wound up.
1137  if (AsmStr[0] == 0) {
1138    O << TAI->getInlineAsmStart() << "\n\t" << TAI->getInlineAsmEnd() << '\n';
1139    return;
1140  }
1141
1142  O << TAI->getInlineAsmStart() << "\n\t";
1143
1144  // The variant of the current asmprinter.
1145  int AsmPrinterVariant = TAI->getAssemblerDialect();
1146
1147  int CurVariant = -1;            // The number of the {.|.|.} region we are in.
1148  const char *LastEmitted = AsmStr; // One past the last character emitted.
1149
1150  while (*LastEmitted) {
1151    switch (*LastEmitted) {
1152    default: {
1153      // Not a special case, emit the string section literally.
1154      const char *LiteralEnd = LastEmitted+1;
1155      while (*LiteralEnd && *LiteralEnd != '{' && *LiteralEnd != '|' &&
1156             *LiteralEnd != '}' && *LiteralEnd != '$' && *LiteralEnd != '\n')
1157        ++LiteralEnd;
1158      if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1159        O.write(LastEmitted, LiteralEnd-LastEmitted);
1160      LastEmitted = LiteralEnd;
1161      break;
1162    }
1163    case '\n':
1164      ++LastEmitted;   // Consume newline character.
1165      O << '\n';       // Indent code with newline.
1166      break;
1167    case '$': {
1168      ++LastEmitted;   // Consume '$' character.
1169      bool Done = true;
1170
1171      // Handle escapes.
1172      switch (*LastEmitted) {
1173      default: Done = false; break;
1174      case '$':     // $$ -> $
1175        if (CurVariant == -1 || CurVariant == AsmPrinterVariant)
1176          O << '$';
1177        ++LastEmitted;  // Consume second '$' character.
1178        break;
1179      case '(':             // $( -> same as GCC's { character.
1180        ++LastEmitted;      // Consume '(' character.
1181        if (CurVariant != -1) {
1182          cerr << "Nested variants found in inline asm string: '"
1183               << AsmStr << "'\n";
1184          exit(1);
1185        }
1186        CurVariant = 0;     // We're in the first variant now.
1187        break;
1188      case '|':
1189        ++LastEmitted;  // consume '|' character.
1190        if (CurVariant == -1) {
1191          cerr << "Found '|' character outside of variant in inline asm "
1192               << "string: '" << AsmStr << "'\n";
1193          exit(1);
1194        }
1195        ++CurVariant;   // We're in the next variant.
1196        break;
1197      case ')':         // $) -> same as GCC's } char.
1198        ++LastEmitted;  // consume ')' character.
1199        if (CurVariant == -1) {
1200          cerr << "Found '}' character outside of variant in inline asm "
1201               << "string: '" << AsmStr << "'\n";
1202          exit(1);
1203        }
1204        CurVariant = -1;
1205        break;
1206      }
1207      if (Done) break;
1208
1209      bool HasCurlyBraces = false;
1210      if (*LastEmitted == '{') {     // ${variable}
1211        ++LastEmitted;               // Consume '{' character.
1212        HasCurlyBraces = true;
1213      }
1214
1215      const char *IDStart = LastEmitted;
1216      char *IDEnd;
1217      errno = 0;
1218      long Val = strtol(IDStart, &IDEnd, 10); // We only accept numbers for IDs.
1219      if (!isdigit(*IDStart) || (Val == 0 && errno == EINVAL)) {
1220        cerr << "Bad $ operand number in inline asm string: '"
1221             << AsmStr << "'\n";
1222        exit(1);
1223      }
1224      LastEmitted = IDEnd;
1225
1226      char Modifier[2] = { 0, 0 };
1227
1228      if (HasCurlyBraces) {
1229        // If we have curly braces, check for a modifier character.  This
1230        // supports syntax like ${0:u}, which correspond to "%u0" in GCC asm.
1231        if (*LastEmitted == ':') {
1232          ++LastEmitted;    // Consume ':' character.
1233          if (*LastEmitted == 0) {
1234            cerr << "Bad ${:} expression in inline asm string: '"
1235                 << AsmStr << "'\n";
1236            exit(1);
1237          }
1238
1239          Modifier[0] = *LastEmitted;
1240          ++LastEmitted;    // Consume modifier character.
1241        }
1242
1243        if (*LastEmitted != '}') {
1244          cerr << "Bad ${} expression in inline asm string: '"
1245               << AsmStr << "'\n";
1246          exit(1);
1247        }
1248        ++LastEmitted;    // Consume '}' character.
1249      }
1250
1251      if ((unsigned)Val >= NumOperands-1) {
1252        cerr << "Invalid $ operand number in inline asm string: '"
1253             << AsmStr << "'\n";
1254        exit(1);
1255      }
1256
1257      // Okay, we finally have a value number.  Ask the target to print this
1258      // operand!
1259      if (CurVariant == -1 || CurVariant == AsmPrinterVariant) {
1260        unsigned OpNo = 1;
1261
1262        bool Error = false;
1263
1264        // Scan to find the machine operand number for the operand.
1265        for (; Val; --Val) {
1266          if (OpNo >= MI->getNumOperands()) break;
1267          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1268          OpNo += (OpFlags >> 3) + 1;
1269        }
1270
1271        if (OpNo >= MI->getNumOperands()) {
1272          Error = true;
1273        } else {
1274          unsigned OpFlags = MI->getOperand(OpNo).getImm();
1275          ++OpNo;  // Skip over the ID number.
1276
1277          if (Modifier[0]=='l')  // labels are target independent
1278            printBasicBlockLabel(MI->getOperand(OpNo).getMBB(),
1279                                 false, false, false);
1280          else {
1281            AsmPrinter *AP = const_cast<AsmPrinter*>(this);
1282            if ((OpFlags & 7) == 4 /*ADDR MODE*/) {
1283              Error = AP->PrintAsmMemoryOperand(MI, OpNo, AsmPrinterVariant,
1284                                                Modifier[0] ? Modifier : 0);
1285            } else {
1286              Error = AP->PrintAsmOperand(MI, OpNo, AsmPrinterVariant,
1287                                          Modifier[0] ? Modifier : 0);
1288            }
1289          }
1290        }
1291        if (Error) {
1292          cerr << "Invalid operand found in inline asm: '"
1293               << AsmStr << "'\n";
1294          MI->dump();
1295          exit(1);
1296        }
1297      }
1298      break;
1299    }
1300    }
1301  }
1302  O << "\n\t" << TAI->getInlineAsmEnd() << '\n';
1303}
1304
1305/// printImplicitDef - This method prints the specified machine instruction
1306/// that is an implicit def.
1307void AsmPrinter::printImplicitDef(const MachineInstr *MI) const {
1308  O << '\t' << TAI->getCommentString() << " implicit-def: "
1309    << TRI->getAsmName(MI->getOperand(0).getReg()) << '\n';
1310}
1311
1312/// printLabel - This method prints a local label used by debug and
1313/// exception handling tables.
1314void AsmPrinter::printLabel(const MachineInstr *MI) const {
1315  printLabel(MI->getOperand(0).getImm());
1316}
1317
1318void AsmPrinter::printLabel(unsigned Id) const {
1319  O << TAI->getPrivateGlobalPrefix() << "label" << Id << ":\n";
1320}
1321
1322/// printDeclare - This method prints a local variable declaration used by
1323/// debug tables.
1324/// FIXME: It doesn't really print anything rather it inserts a DebugVariable
1325/// entry into dwarf table.
1326void AsmPrinter::printDeclare(const MachineInstr *MI) const {
1327  int FI = MI->getOperand(0).getIndex();
1328  GlobalValue *GV = MI->getOperand(1).getGlobal();
1329  MMI->RecordVariable(GV, FI);
1330}
1331
1332/// PrintAsmOperand - Print the specified operand of MI, an INLINEASM
1333/// instruction, using the specified assembler variant.  Targets should
1334/// overried this to format as appropriate.
1335bool AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
1336                                 unsigned AsmVariant, const char *ExtraCode) {
1337  // Target doesn't support this yet!
1338  return true;
1339}
1340
1341bool AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
1342                                       unsigned AsmVariant,
1343                                       const char *ExtraCode) {
1344  // Target doesn't support this yet!
1345  return true;
1346}
1347
1348/// printBasicBlockLabel - This method prints the label for the specified
1349/// MachineBasicBlock
1350void AsmPrinter::printBasicBlockLabel(const MachineBasicBlock *MBB,
1351                                      bool printAlign,
1352                                      bool printColon,
1353                                      bool printComment) const {
1354  if (printAlign) {
1355    unsigned Align = MBB->getAlignment();
1356    if (Align)
1357      EmitAlignment(Log2_32(Align));
1358  }
1359
1360  O << TAI->getPrivateGlobalPrefix() << "BB" << getFunctionNumber() << '_'
1361    << MBB->getNumber();
1362  if (printColon)
1363    O << ':';
1364  if (printComment && MBB->getBasicBlock())
1365    O << '\t' << TAI->getCommentString() << ' '
1366      << MBB->getBasicBlock()->getNameStart();
1367}
1368
1369/// printPICJumpTableSetLabel - This method prints a set label for the
1370/// specified MachineBasicBlock for a jumptable entry.
1371void AsmPrinter::printPICJumpTableSetLabel(unsigned uid,
1372                                           const MachineBasicBlock *MBB) const {
1373  if (!TAI->getSetDirective())
1374    return;
1375
1376  O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
1377    << getFunctionNumber() << '_' << uid << "_set_" << MBB->getNumber() << ',';
1378  printBasicBlockLabel(MBB, false, false, false);
1379  O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1380    << '_' << uid << '\n';
1381}
1382
1383void AsmPrinter::printPICJumpTableSetLabel(unsigned uid, unsigned uid2,
1384                                           const MachineBasicBlock *MBB) const {
1385  if (!TAI->getSetDirective())
1386    return;
1387
1388  O << TAI->getSetDirective() << ' ' << TAI->getPrivateGlobalPrefix()
1389    << getFunctionNumber() << '_' << uid << '_' << uid2
1390    << "_set_" << MBB->getNumber() << ',';
1391  printBasicBlockLabel(MBB, false, false, false);
1392  O << '-' << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
1393    << '_' << uid << '_' << uid2 << '\n';
1394}
1395
1396/// printDataDirective - This method prints the asm directive for the
1397/// specified type.
1398void AsmPrinter::printDataDirective(const Type *type) {
1399  const TargetData *TD = TM.getTargetData();
1400  switch (type->getTypeID()) {
1401  case Type::IntegerTyID: {
1402    unsigned BitWidth = cast<IntegerType>(type)->getBitWidth();
1403    if (BitWidth <= 8)
1404      O << TAI->getData8bitsDirective();
1405    else if (BitWidth <= 16)
1406      O << TAI->getData16bitsDirective();
1407    else if (BitWidth <= 32)
1408      O << TAI->getData32bitsDirective();
1409    else if (BitWidth <= 64) {
1410      assert(TAI->getData64bitsDirective() &&
1411             "Target cannot handle 64-bit constant exprs!");
1412      O << TAI->getData64bitsDirective();
1413    }
1414    break;
1415  }
1416  case Type::PointerTyID:
1417    if (TD->getPointerSize() == 8) {
1418      assert(TAI->getData64bitsDirective() &&
1419             "Target cannot handle 64-bit pointer exprs!");
1420      O << TAI->getData64bitsDirective();
1421    } else {
1422      O << TAI->getData32bitsDirective();
1423    }
1424    break;
1425  case Type::FloatTyID: case Type::DoubleTyID:
1426  case Type::X86_FP80TyID: case Type::FP128TyID: case Type::PPC_FP128TyID:
1427    assert (0 && "Should have already output floating point constant.");
1428  default:
1429    assert (0 && "Can't handle printing this type of thing");
1430    break;
1431  }
1432}
1433
1434void AsmPrinter::printSuffixedName(const char *Name, const char *Suffix,
1435                                   const char *Prefix) {
1436  if (Name[0]=='\"')
1437    O << '\"';
1438  O << TAI->getPrivateGlobalPrefix();
1439  if (Prefix) O << Prefix;
1440  if (Name[0]=='\"')
1441    O << '\"';
1442  if (Name[0]=='\"')
1443    O << Name[1];
1444  else
1445    O << Name;
1446  O << Suffix;
1447  if (Name[0]=='\"')
1448    O << '\"';
1449}
1450
1451void AsmPrinter::printSuffixedName(const std::string &Name, const char* Suffix) {
1452  printSuffixedName(Name.c_str(), Suffix);
1453}
1454
1455void AsmPrinter::printVisibility(const std::string& Name,
1456                                 unsigned Visibility) const {
1457  if (Visibility == GlobalValue::HiddenVisibility) {
1458    if (const char *Directive = TAI->getHiddenDirective())
1459      O << Directive << Name << '\n';
1460  } else if (Visibility == GlobalValue::ProtectedVisibility) {
1461    if (const char *Directive = TAI->getProtectedDirective())
1462      O << Directive << Name << '\n';
1463  }
1464}
1465
1466GCMetadataPrinter *AsmPrinter::GetOrCreateGCPrinter(GCStrategy *S) {
1467  if (!S->usesMetadata())
1468    return 0;
1469
1470  gcp_iterator GCPI = GCMetadataPrinters.find(S);
1471  if (GCPI != GCMetadataPrinters.end())
1472    return GCPI->second;
1473
1474  const char *Name = S->getName().c_str();
1475
1476  for (GCMetadataPrinterRegistry::iterator
1477         I = GCMetadataPrinterRegistry::begin(),
1478         E = GCMetadataPrinterRegistry::end(); I != E; ++I)
1479    if (strcmp(Name, I->getName()) == 0) {
1480      GCMetadataPrinter *GMP = I->instantiate();
1481      GMP->S = S;
1482      GCMetadataPrinters.insert(std::make_pair(S, GMP));
1483      return GMP;
1484    }
1485
1486  cerr << "no GCMetadataPrinter registered for GC: " << Name << "\n";
1487  abort();
1488}
1489