PPCAsmPrinter.cpp revision d2ee218b499fcd364aae7da031819b738f009cd1 
1//===-- PPCAsmPrinter.cpp - Print machine instrs to PowerPC assembly --------=//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file was developed by the LLVM research group and is distributed under
6// the University of Illinois Open Source License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file contains a printer that converts from our internal representation
11// of machine-dependent LLVM code to PowerPC assembly language. This printer is
12// the output mechanism used by `llc'.
13//
14// Documentation at http://developer.apple.com/documentation/DeveloperTools/
15// Reference/Assembler/ASMIntroduction/chapter_1_section_1.html
16//
17//===----------------------------------------------------------------------===//
18
19#define DEBUG_TYPE "asmprinter"
20#include "PPC.h"
21#include "PPCTargetMachine.h"
22#include "PPCSubtarget.h"
23#include "llvm/Constants.h"
24#include "llvm/DerivedTypes.h"
25#include "llvm/Module.h"
26#include "llvm/Assembly/Writer.h"
27#include "llvm/CodeGen/AsmPrinter.h"
28#include "llvm/CodeGen/DwarfWriter.h"
29#include "llvm/CodeGen/MachineDebugInfo.h"
30#include "llvm/CodeGen/MachineFunctionPass.h"
31#include "llvm/CodeGen/MachineInstr.h"
32#include "llvm/Support/Mangler.h"
33#include "llvm/Support/MathExtras.h"
34#include "llvm/Support/CommandLine.h"
35#include "llvm/Support/Debug.h"
36#include "llvm/Target/MRegisterInfo.h"
37#include "llvm/Target/TargetInstrInfo.h"
38#include "llvm/Target/TargetOptions.h"
39#include "llvm/ADT/Statistic.h"
40#include "llvm/ADT/StringExtras.h"
41#include <iostream>
42#include <set>
43using namespace llvm;
44
45namespace {
46  Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
47
48  class PPCAsmPrinter : public AsmPrinter {
49  public:
50    std::set<std::string> FnStubs, GVStubs;
51
52    PPCAsmPrinter(std::ostream &O, TargetMachine &TM)
53      : AsmPrinter(O, TM) {}
54
55    virtual const char *getPassName() const {
56      return "PowerPC Assembly Printer";
57    }
58
59    PPCTargetMachine &getTM() {
60      return static_cast<PPCTargetMachine&>(TM);
61    }
62
63    unsigned enumRegToMachineReg(unsigned enumReg) {
64      switch (enumReg) {
65      default: assert(0 && "Unhandled register!"); break;
66      case PPC::CR0:  return  0;
67      case PPC::CR1:  return  1;
68      case PPC::CR2:  return  2;
69      case PPC::CR3:  return  3;
70      case PPC::CR4:  return  4;
71      case PPC::CR5:  return  5;
72      case PPC::CR6:  return  6;
73      case PPC::CR7:  return  7;
74      }
75      abort();
76    }
77
78    /// printInstruction - This method is automatically generated by tablegen
79    /// from the instruction set description.  This method returns true if the
80    /// machine instruction was sufficiently described to print it, otherwise it
81    /// returns false.
82    bool printInstruction(const MachineInstr *MI);
83
84    void printMachineInstruction(const MachineInstr *MI);
85    void printOp(const MachineOperand &MO);
86
87    void printOperand(const MachineInstr *MI, unsigned OpNo) {
88      const MachineOperand &MO = MI->getOperand(OpNo);
89      if (MO.getType() == MachineOperand::MO_MachineRegister) {
90        assert(MRegisterInfo::isPhysicalRegister(MO.getReg())&&"Not physreg??");
91        O << TM.getRegisterInfo()->get(MO.getReg()).Name;
92      } else if (MO.isImmediate()) {
93        O << MO.getImmedValue();
94      } else {
95        printOp(MO);
96      }
97    }
98
99    bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
100                         unsigned AsmVariant, const char *ExtraCode) {
101       printOperand(MI, OpNo);
102       return false;
103    }
104
105    void printU5ImmOperand(const MachineInstr *MI, unsigned OpNo) {
106      unsigned char value = MI->getOperand(OpNo).getImmedValue();
107      assert(value <= 31 && "Invalid u5imm argument!");
108      O << (unsigned int)value;
109    }
110    void printU6ImmOperand(const MachineInstr *MI, unsigned OpNo) {
111      unsigned char value = MI->getOperand(OpNo).getImmedValue();
112      assert(value <= 63 && "Invalid u6imm argument!");
113      O << (unsigned int)value;
114    }
115    void printS16ImmOperand(const MachineInstr *MI, unsigned OpNo) {
116      O << (short)MI->getOperand(OpNo).getImmedValue();
117    }
118    void printU16ImmOperand(const MachineInstr *MI, unsigned OpNo) {
119      O << (unsigned short)MI->getOperand(OpNo).getImmedValue();
120    }
121    void printS16X4ImmOperand(const MachineInstr *MI, unsigned OpNo) {
122      O << (short)MI->getOperand(OpNo).getImmedValue()*4;
123    }
124    void printBranchOperand(const MachineInstr *MI, unsigned OpNo) {
125      // Branches can take an immediate operand.  This is used by the branch
126      // selection pass to print $+8, an eight byte displacement from the PC.
127      if (MI->getOperand(OpNo).isImmediate()) {
128        O << "$+" << MI->getOperand(OpNo).getImmedValue();
129      } else {
130        printOp(MI->getOperand(OpNo));
131      }
132    }
133    void printCallOperand(const MachineInstr *MI, unsigned OpNo) {
134      const MachineOperand &MO = MI->getOperand(OpNo);
135      if (!PPCGenerateStaticCode) {
136        if (MO.getType() == MachineOperand::MO_GlobalAddress) {
137          GlobalValue *GV = MO.getGlobal();
138          if (((GV->isExternal() || GV->hasWeakLinkage() ||
139                GV->hasLinkOnceLinkage()))) {
140            // Dynamically-resolved functions need a stub for the function.
141            std::string Name = Mang->getValueName(GV);
142            FnStubs.insert(Name);
143            O << "L" << Name << "$stub";
144            return;
145          }
146        }
147        if (MO.getType() == MachineOperand::MO_ExternalSymbol) {
148          std::string Name(GlobalPrefix); Name += MO.getSymbolName();
149          FnStubs.insert(Name);
150          O << "L" << Name << "$stub";
151          return;
152        }
153      }
154
155      printOp(MI->getOperand(OpNo));
156    }
157    void printAbsAddrOperand(const MachineInstr *MI, unsigned OpNo) {
158     O << (int)MI->getOperand(OpNo).getImmedValue()*4;
159    }
160    void printPICLabel(const MachineInstr *MI, unsigned OpNo) {
161      O << "\"L" << getFunctionNumber() << "$pb\"\n";
162      O << "\"L" << getFunctionNumber() << "$pb\":";
163    }
164    void printSymbolHi(const MachineInstr *MI, unsigned OpNo) {
165      if (MI->getOperand(OpNo).isImmediate()) {
166        printS16ImmOperand(MI, OpNo);
167      } else {
168        O << "ha16(";
169        printOp(MI->getOperand(OpNo));
170        if (PICEnabled)
171          O << "-\"L" << getFunctionNumber() << "$pb\")";
172        else
173          O << ')';
174      }
175    }
176    void printSymbolLo(const MachineInstr *MI, unsigned OpNo) {
177      if (MI->getOperand(OpNo).isImmediate()) {
178        printS16ImmOperand(MI, OpNo);
179      } else {
180        O << "lo16(";
181        printOp(MI->getOperand(OpNo));
182        if (PICEnabled)
183          O << "-\"L" << getFunctionNumber() << "$pb\")";
184        else
185          O << ')';
186      }
187    }
188    void printcrbitm(const MachineInstr *MI, unsigned OpNo) {
189      unsigned CCReg = MI->getOperand(OpNo).getReg();
190      unsigned RegNo = enumRegToMachineReg(CCReg);
191      O << (0x80 >> RegNo);
192    }
193    // The new addressing mode printers, currently empty
194    void printMemRegImm(const MachineInstr *MI, unsigned OpNo) {
195      printSymbolLo(MI, OpNo);
196      O << '(';
197      printOperand(MI, OpNo+1);
198      O << ')';
199    }
200    void printMemRegReg(const MachineInstr *MI, unsigned OpNo) {
201      // When used as the base register, r0 reads constant zero rather than
202      // the value contained in the register.  For this reason, the darwin
203      // assembler requires that we print r0 as 0 (no r) when used as the base.
204      const MachineOperand &MO = MI->getOperand(OpNo);
205      if (MO.getReg() == PPC::R0)
206        O << '0';
207      else
208        O << TM.getRegisterInfo()->get(MO.getReg()).Name;
209      O << ", ";
210      printOperand(MI, OpNo+1);
211    }
212
213    virtual bool runOnMachineFunction(MachineFunction &F) = 0;
214    virtual bool doFinalization(Module &M) = 0;
215
216  };
217
218  /// DarwinDwarfWriter - Dwarf debug info writer customized for Darwin/Mac OS X
219  ///
220  struct DarwinDwarfWriter : public DwarfWriter {
221    // Ctor.
222    DarwinDwarfWriter(std::ostream &o, AsmPrinter *ap)
223    : DwarfWriter(o, ap)
224    {
225      needsSet = true;
226      DwarfAbbrevSection = ".section __DWARF,__debug_abbrev";
227      DwarfInfoSection = ".section __DWARF,__debug_info";
228      DwarfLineSection = ".section __DWARF,__debug_line";
229      DwarfFrameSection =
230          ".section __DWARF,__debug_frame,,coalesced,no_toc+strip_static_syms";
231      DwarfPubNamesSection = ".section __DWARF,__debug_pubnames";
232      DwarfPubTypesSection = ".section __DWARF,__debug_pubtypes";
233      DwarfStrSection = ".section __DWARF,__debug_str";
234      DwarfLocSection = ".section __DWARF,__debug_loc";
235      DwarfARangesSection = ".section __DWARF,__debug_aranges";
236      DwarfRangesSection = ".section __DWARF,__debug_ranges";
237      DwarfMacInfoSection = ".section __DWARF,__debug_macinfo";
238      TextSection = ".text";
239      DataSection = ".data";
240    }
241  };
242
243  /// DarwinAsmPrinter - PowerPC assembly printer, customized for Darwin/Mac OS
244  /// X
245  struct DarwinAsmPrinter : public PPCAsmPrinter {
246
247    DarwinDwarfWriter DW;
248
249    DarwinAsmPrinter(std::ostream &O, TargetMachine &TM)
250      : PPCAsmPrinter(O, TM), DW(O, this) {
251      CommentString = ";";
252      GlobalPrefix = "_";
253      PrivateGlobalPrefix = "L";     // Marker for constant pool idxs
254      ZeroDirective = "\t.space\t";  // ".space N" emits N zeros.
255      Data64bitsDirective = 0;       // we can't emit a 64-bit unit
256      AlignmentIsInBytes = false;    // Alignment is by power of 2.
257      ConstantPoolSection = "\t.const\t";
258      LCOMMDirective = "\t.lcomm\t";
259      StaticCtorsSection = ".mod_init_func";
260      StaticDtorsSection = ".mod_term_func";
261      InlineAsmStart = InlineAsmEnd = "";  // Don't use #APP/#NO_APP
262    }
263
264    virtual const char *getPassName() const {
265      return "Darwin PPC Assembly Printer";
266    }
267
268    bool runOnMachineFunction(MachineFunction &F);
269    bool doInitialization(Module &M);
270    bool doFinalization(Module &M);
271
272    void getAnalysisUsage(AnalysisUsage &AU) const {
273      AU.setPreservesAll();
274      AU.addRequired<MachineDebugInfo>();
275      PPCAsmPrinter::getAnalysisUsage(AU);
276    }
277
278  };
279
280  /// AIXAsmPrinter - PowerPC assembly printer, customized for AIX
281  ///
282  struct AIXAsmPrinter : public PPCAsmPrinter {
283    /// Map for labels corresponding to global variables
284    ///
285    std::map<const GlobalVariable*,std::string> GVToLabelMap;
286
287    AIXAsmPrinter(std::ostream &O, TargetMachine &TM)
288      : PPCAsmPrinter(O, TM) {
289      CommentString = "#";
290      GlobalPrefix = ".";
291      ZeroDirective = "\t.space\t";  // ".space N" emits N zeros.
292      Data64bitsDirective = 0;       // we can't emit a 64-bit unit
293      AlignmentIsInBytes = false;    // Alignment is by power of 2.
294      ConstantPoolSection = "\t.const\t";
295    }
296
297    virtual const char *getPassName() const {
298      return "AIX PPC Assembly Printer";
299    }
300
301    bool runOnMachineFunction(MachineFunction &F);
302    bool doInitialization(Module &M);
303    bool doFinalization(Module &M);
304  };
305} // end of anonymous namespace
306
307/// createDarwinAsmPrinterPass - Returns a pass that prints the PPC assembly
308/// code for a MachineFunction to the given output stream, in a format that the
309/// Darwin assembler can deal with.
310///
311FunctionPass *llvm::createDarwinAsmPrinter(std::ostream &o, TargetMachine &tm) {
312  return new DarwinAsmPrinter(o, tm);
313}
314
315/// createAIXAsmPrinterPass - Returns a pass that prints the PPC assembly code
316/// for a MachineFunction to the given output stream, in a format that the
317/// AIX 5L assembler can deal with.
318///
319FunctionPass *llvm::createAIXAsmPrinter(std::ostream &o, TargetMachine &tm) {
320  return new AIXAsmPrinter(o, tm);
321}
322
323// Include the auto-generated portion of the assembly writer
324#include "PPCGenAsmWriter.inc"
325
326void PPCAsmPrinter::printOp(const MachineOperand &MO) {
327  const MRegisterInfo &RI = *TM.getRegisterInfo();
328  int new_symbol;
329
330  switch (MO.getType()) {
331  case MachineOperand::MO_VirtualRegister:
332    if (Value *V = MO.getVRegValueOrNull()) {
333      O << "<" << V->getName() << ">";
334      return;
335    }
336    // FALLTHROUGH
337  case MachineOperand::MO_MachineRegister:
338  case MachineOperand::MO_CCRegister:
339    O << RI.get(MO.getReg()).Name;
340    return;
341
342  case MachineOperand::MO_SignExtendedImmed:
343  case MachineOperand::MO_UnextendedImmed:
344    std::cerr << "printOp() does not handle immediate values\n";
345    abort();
346    return;
347
348  case MachineOperand::MO_PCRelativeDisp:
349    std::cerr << "Shouldn't use addPCDisp() when building PPC MachineInstrs";
350    abort();
351    return;
352
353  case MachineOperand::MO_MachineBasicBlock: {
354    MachineBasicBlock *MBBOp = MO.getMachineBasicBlock();
355    O << PrivateGlobalPrefix << "BB" << getFunctionNumber() << "_"
356      << MBBOp->getNumber() << "\t; " << MBBOp->getBasicBlock()->getName();
357    return;
358  }
359
360  case MachineOperand::MO_ConstantPoolIndex:
361    O << PrivateGlobalPrefix << "CPI" << getFunctionNumber()
362      << '_' << MO.getConstantPoolIndex();
363    return;
364  case MachineOperand::MO_ExternalSymbol:
365    // Computing the address of an external symbol, not calling it.
366    if (!PPCGenerateStaticCode) {
367      std::string Name(GlobalPrefix); Name += MO.getSymbolName();
368      GVStubs.insert(Name);
369      O << "L" << Name << "$non_lazy_ptr";
370      return;
371    }
372    O << GlobalPrefix << MO.getSymbolName();
373    return;
374  case MachineOperand::MO_GlobalAddress: {
375    // Computing the address of a global symbol, not calling it.
376    GlobalValue *GV = MO.getGlobal();
377    std::string Name = Mang->getValueName(GV);
378    int offset = MO.getOffset();
379
380    // External or weakly linked global variables need non-lazily-resolved stubs
381    if (!PPCGenerateStaticCode) {
382      if (((GV->isExternal() || GV->hasWeakLinkage() ||
383            GV->hasLinkOnceLinkage()))) {
384        GVStubs.insert(Name);
385        O << "L" << Name << "$non_lazy_ptr";
386        return;
387      }
388    }
389
390    O << Name;
391    return;
392  }
393
394  default:
395    O << "<unknown operand type: " << MO.getType() << ">";
396    return;
397  }
398}
399
400/// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to
401/// the current output stream.
402///
403void PPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
404  ++EmittedInsts;
405
406  // Check for slwi/srwi mnemonics.
407  if (MI->getOpcode() == PPC::RLWINM) {
408    bool FoundMnemonic = false;
409    unsigned char SH = MI->getOperand(2).getImmedValue();
410    unsigned char MB = MI->getOperand(3).getImmedValue();
411    unsigned char ME = MI->getOperand(4).getImmedValue();
412    if (SH <= 31 && MB == 0 && ME == (31-SH)) {
413      O << "slwi "; FoundMnemonic = true;
414    }
415    if (SH <= 31 && MB == (32-SH) && ME == 31) {
416      O << "srwi "; FoundMnemonic = true;
417      SH = 32-SH;
418    }
419    if (FoundMnemonic) {
420      printOperand(MI, 0);
421      O << ", ";
422      printOperand(MI, 1);
423      O << ", " << (unsigned int)SH << "\n";
424      return;
425    }
426  } else if (MI->getOpcode() == PPC::OR4 || MI->getOpcode() == PPC::OR8) {
427    if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) {
428      O << "mr ";
429      printOperand(MI, 0);
430      O << ", ";
431      printOperand(MI, 1);
432      O << "\n";
433      return;
434    }
435  }
436
437  if (printInstruction(MI))
438    return; // Printer was automatically generated
439
440  assert(0 && "Unhandled instruction in asm writer!");
441  abort();
442  return;
443}
444
445
446/// runOnMachineFunction - This uses the printMachineInstruction()
447/// method to print assembly for each instruction.
448///
449bool DarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
450  // FIXME - is this the earliest this can be set?
451  DW.SetDebugInfo(&getAnalysis<MachineDebugInfo>());
452
453  SetupMachineFunction(MF);
454  O << "\n\n";
455
456  // Emit pre-function debug information.
457  DW.BeginFunction(MF);
458
459  // Print out constants referenced by the function
460  EmitConstantPool(MF.getConstantPool());
461
462  // Print out labels for the function.
463  const Function *F = MF.getFunction();
464  switch (F->getLinkage()) {
465  default: assert(0 && "Unknown linkage type!");
466  case Function::InternalLinkage:  // Symbols default to internal.
467    SwitchSection(".text", F);
468    break;
469  case Function::ExternalLinkage:
470    SwitchSection(".text", F);
471    O << "\t.globl\t" << CurrentFnName << "\n";
472    break;
473  case Function::WeakLinkage:
474  case Function::LinkOnceLinkage:
475    SwitchSection(".section __TEXT,__textcoal_nt,coalesced,pure_instructions",
476                  F);
477    O << "\t.globl\t" << CurrentFnName << "\n";
478    O << "\t.weak_definition\t" << CurrentFnName << "\n";
479    break;
480  }
481  EmitAlignment(4, F);
482  O << CurrentFnName << ":\n";
483
484  // Print out code for the function.
485  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
486       I != E; ++I) {
487    // Print a label for the basic block.
488    if (I != MF.begin()) {
489      O << PrivateGlobalPrefix << "BB" << getFunctionNumber() << '_'
490        << I->getNumber() << ":\t";
491      if (!I->getBasicBlock()->getName().empty())
492        O << CommentString << " " << I->getBasicBlock()->getName();
493      O << "\n";
494    }
495    for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
496         II != E; ++II) {
497      // Print the assembly for the instruction.
498      O << "\t";
499      printMachineInstruction(II);
500    }
501  }
502
503  // Emit post-function debug information.
504  DW.EndFunction(MF);
505
506  // We didn't modify anything.
507  return false;
508}
509
510
511bool DarwinAsmPrinter::doInitialization(Module &M) {
512  if (TM.getSubtarget<PPCSubtarget>().isGigaProcessor())
513    O << "\t.machine ppc970\n";
514  AsmPrinter::doInitialization(M);
515
516  // Darwin wants symbols to be quoted if they have complex names.
517  Mang->setUseQuotes(true);
518
519  // Emit initial debug information.
520  DW.BeginModule(M);
521  return false;
522}
523
524bool DarwinAsmPrinter::doFinalization(Module &M) {
525  const TargetData &TD = TM.getTargetData();
526
527  // Print out module-level global variables here.
528  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
529       I != E; ++I) {
530    if (!I->hasInitializer()) continue;   // External global require no code
531
532    // Check to see if this is a special global used by LLVM, if so, emit it.
533    if (I->hasAppendingLinkage() && EmitSpecialLLVMGlobal(I))
534      continue;
535
536    std::string name = Mang->getValueName(I);
537    Constant *C = I->getInitializer();
538    unsigned Size = TD.getTypeSize(C->getType());
539    unsigned Align = getPreferredAlignmentLog(I);
540
541    if (C->isNullValue() && /* FIXME: Verify correct */
542        (I->hasInternalLinkage() || I->hasWeakLinkage() ||
543         I->hasLinkOnceLinkage() ||
544         (I->hasExternalLinkage() && !I->hasSection()))) {
545      if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
546      if (I->hasExternalLinkage()) {
547        O << "\t.globl " << name << '\n';
548        O << "\t.zerofill __DATA, __common, " << name << ", "
549          << Size << ", " << Align;
550      } else if (I->hasInternalLinkage()) {
551        SwitchSection(".data", I);
552        O << LCOMMDirective << name << "," << Size << "," << Align;
553      } else {
554        SwitchSection(".data", I);
555        O << ".comm " << name << "," << Size;
556      }
557      O << "\t\t; '" << I->getName() << "'\n";
558    } else {
559      switch (I->getLinkage()) {
560      case GlobalValue::LinkOnceLinkage:
561      case GlobalValue::WeakLinkage:
562        O << "\t.globl " << name << '\n'
563          << "\t.weak_definition " << name << '\n';
564        SwitchSection(".section __DATA,__datacoal_nt,coalesced", I);
565        break;
566      case GlobalValue::AppendingLinkage:
567        // FIXME: appending linkage variables should go into a section of
568        // their name or something.  For now, just emit them as external.
569      case GlobalValue::ExternalLinkage:
570        // If external or appending, declare as a global symbol
571        O << "\t.globl " << name << "\n";
572        // FALL THROUGH
573      case GlobalValue::InternalLinkage:
574        SwitchSection(".data", I);
575        break;
576      default:
577        std::cerr << "Unknown linkage type!";
578        abort();
579      }
580
581      EmitAlignment(Align, I);
582      O << name << ":\t\t\t\t; '" << I->getName() << "'\n";
583      EmitGlobalConstant(C);
584      O << '\n';
585    }
586  }
587
588  // Output stubs for dynamically-linked functions
589  if (PICEnabled) {
590    for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
591         i != e; ++i) {
592      SwitchSection(".section __TEXT,__picsymbolstub1,symbol_stubs,"
593                    "pure_instructions,32", 0);
594      EmitAlignment(2);
595      O << "L" << *i << "$stub:\n";
596      O << "\t.indirect_symbol " << *i << "\n";
597      O << "\tmflr r0\n";
598      O << "\tbcl 20,31,L0$" << *i << "\n";
599      O << "L0$" << *i << ":\n";
600      O << "\tmflr r11\n";
601      O << "\taddis r11,r11,ha16(L" << *i << "$lazy_ptr-L0$" << *i << ")\n";
602      O << "\tmtlr r0\n";
603      O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n";
604      O << "\tmtctr r12\n";
605      O << "\tbctr\n";
606      SwitchSection(".lazy_symbol_pointer", 0);
607      O << "L" << *i << "$lazy_ptr:\n";
608      O << "\t.indirect_symbol " << *i << "\n";
609      O << "\t.long dyld_stub_binding_helper\n";
610    }
611  } else {
612    for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end();
613         i != e; ++i) {
614      SwitchSection(".section __TEXT,__symbol_stub1,symbol_stubs,"
615                    "pure_instructions,16", 0);
616      EmitAlignment(4);
617      O << "L" << *i << "$stub:\n";
618      O << "\t.indirect_symbol " << *i << "\n";
619      O << "\tlis r11,ha16(L" << *i << "$lazy_ptr)\n";
620      O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr)(r11)\n";
621      O << "\tmtctr r12\n";
622      O << "\tbctr\n";
623      SwitchSection(".lazy_symbol_pointer", 0);
624      O << "L" << *i << "$lazy_ptr:\n";
625      O << "\t.indirect_symbol " << *i << "\n";
626      O << "\t.long dyld_stub_binding_helper\n";
627    }
628  }
629
630  O << "\n";
631
632  // Output stubs for external and common global variables.
633  if (GVStubs.begin() != GVStubs.end()) {
634    SwitchSection(".non_lazy_symbol_pointer", 0);
635    for (std::set<std::string>::iterator I = GVStubs.begin(),
636         E = GVStubs.end(); I != E; ++I) {
637      O << "L" << *I << "$non_lazy_ptr:\n";
638      O << "\t.indirect_symbol " << *I << "\n";
639      O << "\t.long\t0\n";
640    }
641  }
642
643  // Emit initial debug information.
644  DW.EndModule(M);
645
646  // Funny Darwin hack: This flag tells the linker that no global symbols
647  // contain code that falls through to other global symbols (e.g. the obvious
648  // implementation of multiple entry points).  If this doesn't occur, the
649  // linker can safely perform dead code stripping.  Since LLVM never generates
650  // code that does this, it is always safe to set.
651  O << "\t.subsections_via_symbols\n";
652
653  AsmPrinter::doFinalization(M);
654  return false; // success
655}
656
657/// runOnMachineFunction - This uses the e()
658/// method to print assembly for each instruction.
659///
660bool AIXAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
661  SetupMachineFunction(MF);
662
663  // Print out constants referenced by the function
664  EmitConstantPool(MF.getConstantPool());
665
666  // Print out header for the function.
667  O << "\t.csect .text[PR]\n"
668    << "\t.align 2\n"
669    << "\t.globl "  << CurrentFnName << '\n'
670    << "\t.globl ." << CurrentFnName << '\n'
671    << "\t.csect "  << CurrentFnName << "[DS],3\n"
672    << CurrentFnName << ":\n"
673    << "\t.llong ." << CurrentFnName << ", TOC[tc0], 0\n"
674    << "\t.csect .text[PR]\n"
675    << '.' << CurrentFnName << ":\n";
676
677  // Print out code for the function.
678  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
679       I != E; ++I) {
680    // Print a label for the basic block.
681    O << PrivateGlobalPrefix << "BB" << getFunctionNumber() << '_'
682      << I->getNumber()
683      << ":\t" << CommentString << I->getBasicBlock()->getName() << '\n';
684    for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
685      II != E; ++II) {
686      // Print the assembly for the instruction.
687      O << "\t";
688      printMachineInstruction(II);
689    }
690  }
691
692  O << "LT.." << CurrentFnName << ":\n"
693    << "\t.long 0\n"
694    << "\t.byte 0,0,32,65,128,0,0,0\n"
695    << "\t.long LT.." << CurrentFnName << "-." << CurrentFnName << '\n'
696    << "\t.short 3\n"
697    << "\t.byte \"" << CurrentFnName << "\"\n"
698    << "\t.align 2\n";
699
700  // We didn't modify anything.
701  return false;
702}
703
704bool AIXAsmPrinter::doInitialization(Module &M) {
705  SwitchSection("", 0);
706  const TargetData &TD = TM.getTargetData();
707
708  O << "\t.machine \"ppc64\"\n"
709    << "\t.toc\n"
710    << "\t.csect .text[PR]\n";
711
712  // Print out module-level global variables
713  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
714       I != E; ++I) {
715    if (!I->hasInitializer())
716      continue;
717
718    std::string Name = I->getName();
719    Constant *C = I->getInitializer();
720    // N.B.: We are defaulting to writable strings
721    if (I->hasExternalLinkage()) {
722      O << "\t.globl " << Name << '\n'
723        << "\t.csect .data[RW],3\n";
724    } else {
725      O << "\t.csect _global.rw_c[RW],3\n";
726    }
727    O << Name << ":\n";
728    EmitGlobalConstant(C);
729  }
730
731  // Output labels for globals
732  if (M.global_begin() != M.global_end()) O << "\t.toc\n";
733  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
734       I != E; ++I) {
735    const GlobalVariable *GV = I;
736    // Do not output labels for unused variables
737    if (GV->isExternal() && GV->use_begin() == GV->use_end())
738      continue;
739
740    IncrementFunctionNumber();
741    std::string Name = GV->getName();
742    std::string Label = "LC.." + utostr(getFunctionNumber());
743    GVToLabelMap[GV] = Label;
744    O << Label << ":\n"
745      << "\t.tc " << Name << "[TC]," << Name;
746    if (GV->isExternal()) O << "[RW]";
747    O << '\n';
748   }
749
750  AsmPrinter::doInitialization(M);
751  return false; // success
752}
753
754bool AIXAsmPrinter::doFinalization(Module &M) {
755  const TargetData &TD = TM.getTargetData();
756  // Print out module-level global variables
757  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
758       I != E; ++I) {
759    if (I->hasInitializer() || I->hasExternalLinkage())
760      continue;
761
762    std::string Name = I->getName();
763    if (I->hasInternalLinkage()) {
764      O << "\t.lcomm " << Name << ",16,_global.bss_c";
765    } else {
766      O << "\t.comm " << Name << "," << TD.getTypeSize(I->getType())
767        << "," << Log2_32((unsigned)TD.getTypeAlignment(I->getType()));
768    }
769    O << "\t\t" << CommentString << " ";
770    WriteAsOperand(O, I, false, true, &M);
771    O << "\n";
772  }
773
774  O << "_section_.text:\n"
775    << "\t.csect .data[RW],3\n"
776    << "\t.llong _section_.text\n";
777  AsmPrinter::doFinalization(M);
778  return false; // success
779}
780