Renamed PPC32AsmPrinter.cpp => PowerPCAsmPrinter.cpp as the Darwin and AIX asm

printers are now unified into one file.

llvm-svn: 16173

1 files changed, 710 insertions, 0 deletions

diff --git a/llvm/lib/Target/PowerPC/PowerPCAsmPrinter.cpp b/llvm/lib/Target/PowerPC/PowerPCAsmPrinter.cpp
new file mode 100644
index 00000000000..b0503d2a2da
--- /dev/null
+++ b/llvm/lib/Target/PowerPC/PowerPCAsmPrinter.cpp
@@ -0,0 +1,710 @@
+//===-- PowerPCAsmPrinter.cpp - Print machine instrs to PowerPC assembly --===//
+// 
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// 
+//===----------------------------------------------------------------------===//
+//
+// This file contains a printer that converts from our internal representation
+// of machine-dependent LLVM code to PowerPC assembly language. This printer is
+// the output mechanism used by `llc'.
+//
+// Documentation at http://developer.apple.com/documentation/DeveloperTools/
+// Reference/Assembler/ASMIntroduction/chapter_1_section_1.html
+//
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "asmprinter"
+#include "PowerPC.h"
+#include "PowerPCTargetMachine.h"
+#include "llvm/Constants.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Module.h"
+#include "llvm/Assembly/Writer.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineConstantPool.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/CodeGen/ValueTypes.h"
+#include "llvm/Support/Mangler.h"
+#include "llvm/Support/MathExtras.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/ADT/StringExtras.h"
+#include <set>
+using namespace llvm;
+
+namespace {
+  Statistic<> EmittedInsts("asm-printer", "Number of machine instrs printed");
+
+  struct PPC32AsmPrinter : public AsmPrinter {
+    std::set<std::string> FnStubs, GVStubs, LinkOnceStubs;
+    std::set<std::string> Strings;
+    
+    PPC32AsmPrinter(std::ostream &O, TargetMachine &TM)
+      : AsmPrinter(O, TM), LabelNumber(0) {}
+
+    /// Unique incrementer for label values for referencing Global values.
+    ///
+    unsigned LabelNumber;
+  
+    virtual const char *getPassName() const {
+      return "PowerPC Assembly Printer";
+    }
+
+    PowerPCTargetMachine &getTM() {
+      return static_cast<PowerPCTargetMachine&>(TM);
+    }
+
+    /// printInstruction - This method is automatically generated by tablegen
+    /// from the instruction set description.  This method returns true if the
+    /// machine instruction was sufficiently described to print it, otherwise it
+    /// returns false.
+    bool printInstruction(const MachineInstr *MI);
+
+    void printMachineInstruction(const MachineInstr *MI);
+    void printOp(const MachineOperand &MO, bool LoadAddrOp = false);
+
+    void printOperand(const MachineInstr *MI, unsigned OpNo, MVT::ValueType VT){
+      const MachineOperand &MO = MI->getOperand(OpNo);
+      if (MO.getType() == MachineOperand::MO_MachineRegister) {
+        assert(MRegisterInfo::isPhysicalRegister(MO.getReg())&&"Not physreg??");
+        O << LowercaseString(TM.getRegisterInfo()->get(MO.getReg()).Name);
+      } else if (MO.isImmediate()) {
+        O << MO.getImmedValue();
+      } else {
+        printOp(MO);
+      }
+    }
+
+    void printU5ImmOperand(const MachineInstr *MI, unsigned OpNo,
+                            MVT::ValueType VT) {
+      unsigned char value = MI->getOperand(OpNo).getImmedValue();
+      assert(value <= 31 && "Invalid u5imm argument!");
+      O << (unsigned int)value;
+    }
+    void printU6ImmOperand(const MachineInstr *MI, unsigned OpNo,
+                            MVT::ValueType VT) {
+      unsigned char value = MI->getOperand(OpNo).getImmedValue();
+      assert(value <= 63 && "Invalid u6imm argument!");
+      O << (unsigned int)value;
+    }
+    void printS16ImmOperand(const MachineInstr *MI, unsigned OpNo,
+                            MVT::ValueType VT) {
+      O << (short)MI->getOperand(OpNo).getImmedValue();
+    }
+    void printU16ImmOperand(const MachineInstr *MI, unsigned OpNo,
+                            MVT::ValueType VT) {
+      O << (unsigned short)MI->getOperand(OpNo).getImmedValue();
+    }
+    void printBranchOperand(const MachineInstr *MI, unsigned OpNo,
+                          MVT::ValueType VT) {
+      
+      // Branches can take an immediate operand.  This is used by the branch
+      // selection pass to print $+8, an eight byte displacement from the PC.
+      if (MI->getOperand(OpNo).isImmediate()) {
+        O << "$+" << MI->getOperand(OpNo).getImmedValue() << '\n';
+      } else {
+        printOp(MI->getOperand(OpNo));
+      }
+    }
+    void printPICLabel(const MachineInstr *MI, unsigned OpNo,
+                         MVT::ValueType VT) {
+      // FIXME: should probably be converted to cout.width and cout.fill
+      O << "\"L0000" << LabelNumber << "$pb\"\n";
+      O << "\"L0000" << LabelNumber << "$pb\":";
+    }
+    void printSymbolHi(const MachineInstr *MI, unsigned OpNo,
+                         MVT::ValueType VT) {
+      O << "ha16(";
+      printOp(MI->getOperand(OpNo), true /* LoadAddrOp */);
+      O << "-\"L0000" << LabelNumber << "$pb\")";
+    }
+    void printSymbolLo(const MachineInstr *MI, unsigned OpNo,
+                         MVT::ValueType VT) {
+      // FIXME: Because LFS, LFD, and LWZ can be used either with a s16imm or
+      // a lo16 of a global or constant pool operand, we must handle both here.
+      // this isn't a great design, but it works for now.
+      if (MI->getOperand(OpNo).isImmediate()) {
+        O << (short)MI->getOperand(OpNo).getImmedValue();
+      } else {
+        O << "lo16(";
+        printOp(MI->getOperand(OpNo), true /* LoadAddrOp */);
+        O << "-\"L0000" << LabelNumber << "$pb\")";
+      }
+    }
+  
+    virtual void printConstantPool(MachineConstantPool *MCP) = 0;
+    virtual bool runOnMachineFunction(MachineFunction &F) = 0;    
+    virtual bool doFinalization(Module &M) = 0;
+  };
+  
+  //
+  //
+  struct DarwinAsmPrinter : public PPC32AsmPrinter {
+
+    DarwinAsmPrinter(std::ostream &O, TargetMachine &TM)
+      : PPC32AsmPrinter(O, TM) {
+      CommentString = ";";
+      GlobalPrefix = "_";
+      ZeroDirective = "\t.space\t";  // ".space N" emits N zeros.
+      Data64bitsDirective = 0;       // we can't emit a 64-bit unit
+      AlignmentIsInBytes = false;    // Alignment is by power of 2.
+    }
+
+    virtual const char *getPassName() const {
+      return "Darwin PPC Assembly Printer";
+    }
+
+    void printConstantPool(MachineConstantPool *MCP);
+    bool runOnMachineFunction(MachineFunction &F);    
+    bool doFinalization(Module &M);
+  };
+  
+  //
+  //
+  struct AIXAsmPrinter : public PPC32AsmPrinter {
+    /// Map for labels corresponding to global variables
+    ///
+    std::map<const GlobalVariable*,std::string> GVToLabelMap;
+
+    AIXAsmPrinter(std::ostream &O, TargetMachine &TM)
+      : PPC32AsmPrinter(O, TM) {
+      CommentString = "#";
+      GlobalPrefix = "_";
+      ZeroDirective = "\t.space\t";  // ".space N" emits N zeros.
+      Data64bitsDirective = 0;       // we can't emit a 64-bit unit
+      AlignmentIsInBytes = false;    // Alignment is by power of 2.
+    }
+    
+    virtual const char *getPassName() const {
+      return "AIX PPC Assembly Printer";
+    }
+
+    void printConstantPool(MachineConstantPool *MCP);
+    bool runOnMachineFunction(MachineFunction &F);    
+    bool doInitialization(Module &M);
+    bool doFinalization(Module &M);
+  };
+} // end of anonymous namespace
+
+// SwitchSection - Switch to the specified section of the executable if we are
+// not already in it!
+//
+static void SwitchSection(std::ostream &OS, std::string &CurSection,
+                          const char *NewSection) {
+  if (CurSection != NewSection) {
+    CurSection = NewSection;
+    if (!CurSection.empty())
+      OS << "\t" << NewSection << "\n";
+  }
+}
+
+/// isStringCompatible - Can we treat the specified array as a string?
+/// Only if it is an array of ubytes or non-negative sbytes.
+///
+static bool isStringCompatible(const ConstantArray *CVA) {
+  const Type *ETy = cast<ArrayType>(CVA->getType())->getElementType();
+  if (ETy == Type::UByteTy) return true;
+  if (ETy != Type::SByteTy) return false;
+
+  for (unsigned i = 0; i < CVA->getNumOperands(); ++i)
+    if (cast<ConstantSInt>(CVA->getOperand(i))->getValue() < 0)
+      return false;
+
+  return true;
+}
+
+/// toOctal - Convert the low order bits of X into an octal digit.
+///
+static inline char toOctal(int X) {
+  return (X&7)+'0';
+}
+
+// Possible states while outputting ASCII strings
+namespace {
+  enum StringSection {
+    None,
+    Alpha,
+    Numeric
+  };
+}
+
+/// SwitchStringSection - manage the changes required to output bytes as
+/// characters in a string vs. numeric decimal values
+/// 
+static inline void SwitchStringSection(std::ostream &O, StringSection NewSect,
+                                       StringSection &Current) {
+  if (Current == None) {
+    if (NewSect == Alpha)
+      O << "\t.byte \"";
+    else if (NewSect == Numeric)
+      O << "\t.byte ";
+  } else if (Current == Alpha) {
+    if (NewSect == None)
+      O << "\"";
+    else if (NewSect == Numeric) 
+      O << "\"\n"
+        << "\t.byte ";
+  } else if (Current == Numeric) {
+    if (NewSect == Alpha)
+      O << '\n'
+        << "\t.byte \"";
+    else if (NewSect == Numeric)
+      O << ", ";
+  }
+
+  Current = NewSect;
+}
+
+/// getAsCString - Return the specified array as a C compatible
+/// string, only if the predicate isStringCompatible is true.
+///
+static void printAsCString(std::ostream &O, const ConstantArray *CVA) {
+  assert(isStringCompatible(CVA) && "Array is not string compatible!");
+
+  if (CVA->getNumOperands() == 0)
+    return;
+
+  StringSection Current = None;
+  for (unsigned i = 0, e = CVA->getNumOperands(); i != e; ++i) {
+    unsigned char C = cast<ConstantInt>(CVA->getOperand(i))->getRawValue();
+    if (C == '"') {
+      SwitchStringSection(O, Alpha, Current);
+      O << "\"\"";
+    } else if (isprint(C)) {
+      SwitchStringSection(O, Alpha, Current);
+      O << C;
+    } else {
+      SwitchStringSection(O, Numeric, Current);
+      O << utostr((unsigned)C);
+    }
+  }
+  SwitchStringSection(O, None, Current);
+  O << '\n';
+}
+
+/// createDarwinAsmPrinterPass - Returns a pass that prints the PPC assembly 
+/// code for a MachineFunction to the given output stream, in a format that the 
+/// Darwin assembler can deal with.
+///
+FunctionPass *llvm::createDarwinAsmPrinter(std::ostream &o, TargetMachine &tm) {
+  return new DarwinAsmPrinter(o, tm);
+}
+
+/// createAIXAsmPrinterPass - Returns a pass that prints the PPC assembly code
+/// for a MachineFunction to the given output stream, in a format that the 
+/// AIX 5L assembler can deal with.
+///
+FunctionPass *llvm::createAIXAsmPrinter(std::ostream &o, TargetMachine &tm) {
+  return new AIXAsmPrinter(o, tm);
+}
+
+// Include the auto-generated portion of the assembly writer
+#include "PowerPCGenAsmWriter.inc"
+
+void PPC32AsmPrinter::printOp(const MachineOperand &MO,
+                              bool LoadAddrOp /* = false */) {
+  const MRegisterInfo &RI = *TM.getRegisterInfo();
+  int new_symbol;
+  
+  switch (MO.getType()) {
+  case MachineOperand::MO_VirtualRegister:
+    if (Value *V = MO.getVRegValueOrNull()) {
+      O << "<" << V->getName() << ">";
+      return;
+    }
+    // FALLTHROUGH
+  case MachineOperand::MO_MachineRegister:
+  case MachineOperand::MO_CCRegister:
+    O << LowercaseString(RI.get(MO.getReg()).Name);
+    return;
+
+  case MachineOperand::MO_SignExtendedImmed:
+  case MachineOperand::MO_UnextendedImmed:
+    std::cerr << "printOp() does not handle immediate values\n";
+    abort();
+    return;
+
+  case MachineOperand::MO_PCRelativeDisp:
+    std::cerr << "Shouldn't use addPCDisp() when building PPC MachineInstrs";
+    abort();
+    return;
+    
+  case MachineOperand::MO_MachineBasicBlock: {
+    MachineBasicBlock *MBBOp = MO.getMachineBasicBlock();
+    O << ".LBB" << Mang->getValueName(MBBOp->getParent()->getFunction())
+      << "_" << MBBOp->getNumber() << "\t; "
+      << MBBOp->getBasicBlock()->getName();
+    return;
+  }
+
+  case MachineOperand::MO_ConstantPoolIndex:
+    O << ".CPI" << CurrentFnName << "_" << MO.getConstantPoolIndex();
+    return;
+
+  case MachineOperand::MO_ExternalSymbol:
+    O << MO.getSymbolName();
+    return;
+
+  case MachineOperand::MO_GlobalAddress: {
+    GlobalValue *GV = MO.getGlobal();
+    std::string Name = Mang->getValueName(GV);
+
+    // Dynamically-resolved functions need a stub for the function.  Be
+    // wary however not to output $stub for external functions whose addresses
+    // are taken.  Those should be emitted as $non_lazy_ptr below.
+    Function *F = dyn_cast<Function>(GV);
+    if (F && F->isExternal() && !LoadAddrOp &&
+        getTM().CalledFunctions.count(F)) {
+      FnStubs.insert(Name);
+      O << "L" << Name << "$stub";
+      return;
+    }
+    
+    // External global variables need a non-lazily-resolved stub
+    if (GV->isExternal() && getTM().AddressTaken.count(GV)) {
+      GVStubs.insert(Name);
+      O << "L" << Name << "$non_lazy_ptr";
+      return;
+    }
+    
+    if (F && LoadAddrOp && getTM().AddressTaken.count(GV)) {
+      LinkOnceStubs.insert(Name);
+      O << "L" << Name << "$non_lazy_ptr";
+      return;
+    }
+            
+    O << Mang->getValueName(GV);
+    return;
+  }
+    
+  default:
+    O << "<unknown operand type: " << MO.getType() << ">";
+    return;
+  }
+}
+
+/// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to
+/// the current output stream.
+///
+void PPC32AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
+  ++EmittedInsts;
+  if (printInstruction(MI))
+    return; // Printer was automatically generated
+  
+  assert(0 && "Unhandled instruction in asm writer!");
+  abort();
+  return;
+}
+
+/// runOnMachineFunction - This uses the printMachineInstruction()
+/// method to print assembly for each instruction.
+///
+bool DarwinAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
+  setupMachineFunction(MF);
+  O << "\n\n";
+
+  // Print out constants referenced by the function
+  printConstantPool(MF.getConstantPool());
+
+  // Print out labels for the function.
+  O << "\t.text\n";
+  emitAlignment(2);
+  O << "\t.globl\t" << CurrentFnName << "\n";
+  O << CurrentFnName << ":\n";
+
+  // Print out code for the function.
+  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
+       I != E; ++I) {
+    // Print a label for the basic block.
+    O << ".LBB" << CurrentFnName << "_" << I->getNumber() << ":\t"
+      << CommentString << " " << I->getBasicBlock()->getName() << "\n";
+    for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
+         II != E; ++II) {
+      // Print the assembly for the instruction.
+      O << "\t";
+      printMachineInstruction(II);
+    }
+  }
+  ++LabelNumber;
+
+  // We didn't modify anything.
+  return false;
+}
+
+/// printConstantPool - Print to the current output stream assembly
+/// representations of the constants in the constant pool MCP. This is
+/// used to print out constants which have been "spilled to memory" by
+/// the code generator.
+///
+void DarwinAsmPrinter::printConstantPool(MachineConstantPool *MCP) {
+  const std::vector<Constant*> &CP = MCP->getConstants();
+  const TargetData &TD = TM.getTargetData();
+ 
+  if (CP.empty()) return;
+
+  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
+    O << "\t.const\n";
+    emitAlignment(TD.getTypeAlignmentShift(CP[i]->getType()));
+    O << ".CPI" << CurrentFnName << "_" << i << ":\t\t\t\t\t" << CommentString
+      << *CP[i] << "\n";
+    emitGlobalConstant(CP[i]);
+  }
+}
+
+bool DarwinAsmPrinter::doFinalization(Module &M) {
+  const TargetData &TD = TM.getTargetData();
+  std::string CurSection;
+
+  // Print out module-level global variables here.
+  for (Module::const_giterator I = M.gbegin(), E = M.gend(); I != E; ++I)
+    if (I->hasInitializer()) {   // External global require no code
+      O << "\n\n";
+      std::string name = Mang->getValueName(I);
+      Constant *C = I->getInitializer();
+      unsigned Size = TD.getTypeSize(C->getType());
+      unsigned Align = TD.getTypeAlignmentShift(C->getType());
+
+      if (C->isNullValue() && /* FIXME: Verify correct */
+          (I->hasInternalLinkage() || I->hasWeakLinkage())) {
+        SwitchSection(O, CurSection, ".data");
+        if (I->hasInternalLinkage())
+          O << ".lcomm " << name << "," << TD.getTypeSize(C->getType())
+            << "," << Align;
+        else 
+          O << ".comm " << name << "," << TD.getTypeSize(C->getType());
+        O << "\t\t; ";
+        WriteAsOperand(O, I, true, true, &M);
+        O << "\n";
+      } else {
+        switch (I->getLinkage()) {
+        case GlobalValue::LinkOnceLinkage:
+          O << ".section __TEXT,__textcoal_nt,coalesced,no_toc\n"
+            << ".weak_definition " << name << '\n'
+            << ".private_extern " << name << '\n'
+            << ".section __DATA,__datacoal_nt,coalesced,no_toc\n";
+          LinkOnceStubs.insert(name);
+          break;  
+        case GlobalValue::WeakLinkage:   // FIXME: Verify correct for weak.
+          // Nonnull linkonce -> weak
+          O << "\t.weak " << name << "\n";
+          SwitchSection(O, CurSection, "");
+          O << "\t.section\t.llvm.linkonce.d." << name << ",\"aw\",@progbits\n";
+          break;
+        case GlobalValue::AppendingLinkage:
+          // FIXME: appending linkage variables should go into a section of
+          // their name or something.  For now, just emit them as external.
+        case GlobalValue::ExternalLinkage:
+          // If external or appending, declare as a global symbol
+          O << "\t.globl " << name << "\n";
+          // FALL THROUGH
+        case GlobalValue::InternalLinkage:
+          SwitchSection(O, CurSection, ".data");
+          break;
+        }
+
+        emitAlignment(Align);
+        O << name << ":\t\t\t\t; ";
+        WriteAsOperand(O, I, true, true, &M);
+        O << " = ";
+        WriteAsOperand(O, C, false, false, &M);
+        O << "\n";
+        emitGlobalConstant(C);
+      }
+    }
+
+  // Output stubs for dynamically-linked functions
+  for (std::set<std::string>::iterator i = FnStubs.begin(), e = FnStubs.end(); 
+       i != e; ++i)
+  {
+    O << ".data\n";
+    O << ".section __TEXT,__picsymbolstub1,symbol_stubs,pure_instructions,32\n";
+    emitAlignment(2);
+    O << "L" << *i << "$stub:\n";
+    O << "\t.indirect_symbol " << *i << "\n";
+    O << "\tmflr r0\n";
+    O << "\tbcl 20,31,L0$" << *i << "\n";
+    O << "L0$" << *i << ":\n";
+    O << "\tmflr r11\n";
+    O << "\taddis r11,r11,ha16(L" << *i << "$lazy_ptr-L0$" << *i << ")\n";
+    O << "\tmtlr r0\n";
+    O << "\tlwzu r12,lo16(L" << *i << "$lazy_ptr-L0$" << *i << ")(r11)\n";
+    O << "\tmtctr r12\n";
+    O << "\tbctr\n";
+    O << ".data\n";
+    O << ".lazy_symbol_pointer\n";
+    O << "L" << *i << "$lazy_ptr:\n";
+    O << "\t.indirect_symbol " << *i << "\n";
+    O << "\t.long dyld_stub_binding_helper\n";
+  }
+
+  O << "\n";
+
+  // Output stubs for external global variables
+  if (GVStubs.begin() != GVStubs.end())
+    O << ".data\n.non_lazy_symbol_pointer\n";
+  for (std::set<std::string>::iterator i = GVStubs.begin(), e = GVStubs.end(); 
+       i != e; ++i) {
+    O << "L" << *i << "$non_lazy_ptr:\n";
+    O << "\t.indirect_symbol " << *i << "\n";
+    O << "\t.long\t0\n";
+  }
+  
+  // Output stubs for link-once variables
+  if (LinkOnceStubs.begin() != LinkOnceStubs.end())
+    O << ".data\n.align 2\n";
+  for (std::set<std::string>::iterator i = LinkOnceStubs.begin(), 
+         e = LinkOnceStubs.end(); i != e; ++i) {
+    O << "L" << *i << "$non_lazy_ptr:\n"
+      << "\t.long\t" << *i << '\n';
+  }
+  
+  AsmPrinter::doFinalization(M);
+  return false; // success
+}
+
+/// runOnMachineFunction - This uses the printMachineInstruction()
+/// method to print assembly for each instruction.
+///
+bool AIXAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
+  CurrentFnName = MF.getFunction()->getName();
+
+  // Print out constants referenced by the function
+  printConstantPool(MF.getConstantPool());
+
+  // Print out header for the function.
+  O << "\t.csect .text[PR]\n"
+    << "\t.align 2\n"
+    << "\t.globl "  << CurrentFnName << '\n'
+    << "\t.globl ." << CurrentFnName << '\n'
+    << "\t.csect "  << CurrentFnName << "[DS],3\n"
+    << CurrentFnName << ":\n"
+    << "\t.llong ." << CurrentFnName << ", TOC[tc0], 0\n"
+    << "\t.csect .text[PR]\n"
+    << '.' << CurrentFnName << ":\n";
+
+  // Print out code for the function.
+  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
+       I != E; ++I) {
+    // Print a label for the basic block.
+    O << "LBB" << CurrentFnName << "_" << I->getNumber() << ":\t# "
+      << I->getBasicBlock()->getName() << "\n";
+    for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
+      II != E; ++II) {
+      // Print the assembly for the instruction.
+      O << "\t";
+      printMachineInstruction(II);
+    }
+  }
+  ++LabelNumber;
+
+  O << "LT.." << CurrentFnName << ":\n"
+    << "\t.long 0\n"
+    << "\t.byte 0,0,32,65,128,0,0,0\n"
+    << "\t.long LT.." << CurrentFnName << "-." << CurrentFnName << '\n'
+    << "\t.short 3\n"
+    << "\t.byte \"" << CurrentFnName << "\"\n"
+    << "\t.align 2\n";
+
+  // We didn't modify anything.
+  return false;
+}
+
+/// printConstantPool - Print to the current output stream assembly
+/// representations of the constants in the constant pool MCP. This is
+/// used to print out constants which have been "spilled to memory" by
+/// the code generator.
+///
+void AIXAsmPrinter::printConstantPool(MachineConstantPool *MCP) {
+  const std::vector<Constant*> &CP = MCP->getConstants();
+  const TargetData &TD = TM.getTargetData();
+ 
+  if (CP.empty()) return;
+
+  for (unsigned i = 0, e = CP.size(); i != e; ++i) {
+    O << "\t.const\n";
+    O << "\t.align " << (unsigned)TD.getTypeAlignment(CP[i]->getType())
+      << "\n";
+    O << ".CPI" << CurrentFnName << "_" << i << ":\t\t\t\t\t;"
+      << *CP[i] << "\n";
+    emitGlobalConstant(CP[i]);
+  }
+}
+
+bool AIXAsmPrinter::doInitialization(Module &M) {
+  const TargetData &TD = TM.getTargetData();
+  std::string CurSection;
+
+  O << "\t.machine \"ppc64\"\n" 
+    << "\t.toc\n"
+    << "\t.csect .text[PR]\n";
+
+  // Print out module-level global variables
+  for (Module::const_giterator I = M.gbegin(), E = M.gend(); I != E; ++I) {
+    if (!I->hasInitializer())
+      continue;
+ 
+    std::string Name = I->getName();
+    Constant *C = I->getInitializer();
+    // N.B.: We are defaulting to writable strings
+    if (I->hasExternalLinkage()) { 
+      O << "\t.globl " << Name << '\n'
+        << "\t.csect .data[RW],3\n";
+    } else {
+      O << "\t.csect _global.rw_c[RW],3\n";
+    }
+    O << Name << ":\n";
+    emitGlobalConstant(C);
+  }
+
+  // Output labels for globals
+  if (M.gbegin() != M.gend()) O << "\t.toc\n";
+  for (Module::const_giterator I = M.gbegin(), E = M.gend(); I != E; ++I) {
+    const GlobalVariable *GV = I;
+    // Do not output labels for unused variables
+    if (GV->isExternal() && GV->use_begin() == GV->use_end())
+      continue;
+
+    std::string Name = GV->getName();
+    std::string Label = "LC.." + utostr(LabelNumber++);
+    GVToLabelMap[GV] = Label;
+    O << Label << ":\n"
+      << "\t.tc " << Name << "[TC]," << Name;
+    if (GV->isExternal()) O << "[RW]";
+    O << '\n';
+  }
+
+  Mang = new Mangler(M, ".");
+  return false; // success
+}
+
+bool AIXAsmPrinter::doFinalization(Module &M) {
+  const TargetData &TD = TM.getTargetData();
+  // Print out module-level global variables
+  for (Module::const_giterator I = M.gbegin(), E = M.gend(); I != E; ++I) {
+    if (I->hasInitializer() || I->hasExternalLinkage())
+      continue;
+
+    std::string Name = I->getName();
+    if (I->hasInternalLinkage()) {
+      O << "\t.lcomm " << Name << ",16,_global.bss_c";
+    } else {
+      O << "\t.comm " << Name << "," << TD.getTypeSize(I->getType())
+        << "," << log2((unsigned)TD.getTypeAlignment(I->getType()));
+    }
+    O << "\t\t# ";
+    WriteAsOperand(O, I, true, true, &M);
+    O << "\n";
+  }
+
+  O << "_section_.text:\n"
+    << "\t.csect .data[RW],3\n"
+    << "\t.llong _section_.text\n";
+
+  delete Mang;
+  return false; // success
+}