1 files changed, 382 insertions, 162 deletions

diff --git a/lib/Target/PowerPC/PPC32AsmPrinter.cpp b/lib/Target/PowerPC/PPC32AsmPrinter.cpp
index cadc88a..1d2163c 100644
--- a/lib/Target/PowerPC/PPC32AsmPrinter.cpp
+++ b/lib/Target/PowerPC/PPC32AsmPrinter.cpp
@@ -1,4 +1,4 @@
-//===-- PPC32AsmPrinter.cpp - Print machine instrs to PowerPC assembly ----===//
+//===-- PowerPCAsmPrinter.cpp - Print machine instrs to PowerPC assembly --===//
 // 
 //                     The LLVM Compiler Infrastructure
 //
@@ -18,7 +18,7 @@
 
 #define DEBUG_TYPE "asmprinter"
 #include "PowerPC.h"
-#include "PPC32TargetMachine.h"
+#include "PowerPCTargetMachine.h"
 #include "llvm/Constants.h"
 #include "llvm/DerivedTypes.h"
 #include "llvm/Module.h"
@@ -42,26 +42,20 @@ namespace {
   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) {
-      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.
-    }
+      : AsmPrinter(O, TM), LabelNumber(0) {}
 
     /// Unique incrementer for label values for referencing Global values.
     ///
     unsigned LabelNumber;
   
     virtual const char *getPassName() const {
-      return "PPC32 Assembly Printer";
+      return "PowerPC Assembly Printer";
     }
 
-    PPC32TargetMachine &getTM() {
-      return static_cast<PPC32TargetMachine&>(TM);
+    PowerPCTargetMachine &getTM() {
+      return static_cast<PowerPCTargetMachine&>(TM);
     }
 
     /// printInstruction - This method is automatically generated by tablegen
@@ -72,7 +66,6 @@ namespace {
 
     void printMachineInstruction(const MachineInstr *MI);
     void printOp(const MachineOperand &MO, bool LoadAddrOp = false);
-    void printImmOp(const MachineOperand &MO, unsigned ArgType);
 
     void printOperand(const MachineInstr *MI, unsigned OpNo, MVT::ValueType VT){
       const MachineOperand &MO = MI->getOperand(OpNo);
@@ -98,13 +91,24 @@ namespace {
       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) {
-      printOp(MI->getOperand(OpNo));
+      
+      // 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) {
@@ -112,80 +116,195 @@ namespace {
       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
 
-/// createPPC32AsmPrinterPass - Returns a pass that prints the PPC
-/// assembly code for a MachineFunction to the given output stream,
-/// using the given target machine description.  This should work
-/// regardless of whether the function is in SSA form or not.
-///
-FunctionPass *llvm::createPPC32AsmPrinter(std::ostream &o, TargetMachine &tm) {
-  return new PPC32AsmPrinter(o, tm);
+// 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";
+  }
 }
 
-// Include the auto-generated portion of the assembly writer
-#include "PowerPCGenAsmWriter.inc"
+/// 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;
 
-/// 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.
+  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.
 ///
-void PPC32AsmPrinter::printConstantPool(MachineConstantPool *MCP) {
-  const std::vector<Constant*> &CP = MCP->getConstants();
-  const TargetData &TD = TM.getTargetData();
- 
-  if (CP.empty()) return;
+static inline char toOctal(int X) {
+  return (X&7)+'0';
+}
 
-  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]);
+// 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;
 }
 
-/// runOnMachineFunction - This uses the printMachineInstruction()
-/// method to print assembly for each instruction.
+/// getAsCString - Return the specified array as a C compatible
+/// string, only if the predicate isStringCompatible is true.
 ///
-bool PPC32AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
-  setupMachineFunction(MF);
-  O << "\n\n";
-
-  // Print out constants referenced by the function
-  printConstantPool(MF.getConstantPool());
+static void printAsCString(std::ostream &O, const ConstantArray *CVA) {
+  assert(isStringCompatible(CVA) && "Array is not string compatible!");
 
-  // Print out labels for the function.
-  O << "\t.text\n";
-  emitAlignment(2);
-  O << "\t.globl\t" << CurrentFnName << "\n";
-  O << CurrentFnName << ":\n";
+  if (CVA->getNumOperands() == 0)
+    return;
 
-  // 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);
+  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);
     }
   }
-  ++LabelNumber;
+  SwitchStringSection(O, None, Current);
+  O << '\n';
+}
 
-  // We didn't modify anything.
-  return false;
+/// 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();
@@ -268,15 +387,6 @@ void PPC32AsmPrinter::printOp(const MachineOperand &MO,
   }
 }
 
-void PPC32AsmPrinter::printImmOp(const MachineOperand &MO, unsigned ArgType) {
-  int Imm = MO.getImmedValue();
-  if (ArgType == PPCII::Simm16 || ArgType == PPCII::Disimm16) {
-    O << (short)Imm;
-  } else {
-    O << Imm;
-  }
-}
-
 /// printMachineInstruction -- Print out a single PowerPC MI in Darwin syntax to
 /// the current output stream.
 ///
@@ -284,100 +394,68 @@ void PPC32AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
   ++EmittedInsts;
   if (printInstruction(MI))
     return; // Printer was automatically generated
-    
-  unsigned Opcode = MI->getOpcode();
-  const TargetInstrInfo &TII = *TM.getInstrInfo();
-  const TargetInstrDescriptor &Desc = TII.get(Opcode);
-  unsigned i;
-
-  unsigned ArgCount = MI->getNumOperands();
-  unsigned ArgType[] = {
-    (Desc.TSFlags >> PPCII::Arg0TypeShift) & PPCII::ArgTypeMask,
-    (Desc.TSFlags >> PPCII::Arg1TypeShift) & PPCII::ArgTypeMask,
-    (Desc.TSFlags >> PPCII::Arg2TypeShift) & PPCII::ArgTypeMask,
-    (Desc.TSFlags >> PPCII::Arg3TypeShift) & PPCII::ArgTypeMask,
-    (Desc.TSFlags >> PPCII::Arg4TypeShift) & PPCII::ArgTypeMask
-  };
-  assert(((Desc.TSFlags & PPCII::VMX) == 0) &&
-         "Instruction requires VMX support");
-  assert(((Desc.TSFlags & PPCII::PPC64) == 0) &&
-         "Instruction requires 64 bit support");
-
-  O << TII.getName(Opcode) << " ";
-  if (Opcode == PPC::LOADHiAddr) {
-    printOp(MI->getOperand(0));
-    O << ", ";
-    if (MI->getOperand(1).getReg() == PPC::R0)
-      O << "0";
-    else
-      printOp(MI->getOperand(1));
-    O << ", ha16(" ;
-    printOp(MI->getOperand(2), true /* LoadAddrOp */);
-     O << "-\"L0000" << LabelNumber << "$pb\")\n";
-  } else if (ArgCount == 3 && (MI->getOperand(2).isConstantPoolIndex() 
-                            || MI->getOperand(2).isGlobalAddress())) {
-    printOp(MI->getOperand(0));
-    O << ", lo16(";
-    printOp(MI->getOperand(2), true /* LoadAddrOp */);
-    O << "-\"L0000" << LabelNumber << "$pb\")";
-    O << "(";
-    if (MI->getOperand(1).getReg() == PPC::R0)
-      O << "0";
-    else
-      printOp(MI->getOperand(1));
-    O << ")\n";
-  } else if (ArgCount == 3 && ArgType[1] == PPCII::Disimm16) {
-    printOp(MI->getOperand(0));
-    O << ", ";
-    printImmOp(MI->getOperand(1), ArgType[1]);
-    O << "(";
-    if (MI->getOperand(2).hasAllocatedReg() &&
-        MI->getOperand(2).getReg() == PPC::R0)
-      O << "0";
-    else
-      printOp(MI->getOperand(2));
-    O << ")\n";
-  } else {
-    for (i = 0; i < ArgCount; ++i) {
-      // addi and friends
-      if (i == 1 && ArgCount == 3 && ArgType[2] == PPCII::Simm16 &&
-          MI->getOperand(1).hasAllocatedReg() && 
-          MI->getOperand(1).getReg() == PPC::R0) {
-        O << "0";
-      // for long branch support, bc $+8
-      } else if (i == 1 && ArgCount == 2 && MI->getOperand(1).isImmediate() &&
-                 TII.isBranch(MI->getOpcode())) {
-        O << "$+8";
-        assert(8 == MI->getOperand(i).getImmedValue()
-          && "branch off PC not to pc+8?");
-        //printOp(MI->getOperand(i));
-      } else if (MI->getOperand(i).isImmediate()) {
-        printImmOp(MI->getOperand(i), ArgType[i]);
-      } else {
-        printOp(MI->getOperand(i));
-      }
-      if (ArgCount - 1 == i)
-        O << "\n";
-      else
-        O << ", ";
+  
+  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);
     }
   }
-  return;
+  ++LabelNumber;
+
+  // We didn't modify anything.
+  return false;
 }
 
-// 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";
+/// 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 PPC32AsmPrinter::doFinalization(Module &M) {
+bool DarwinAsmPrinter::doFinalization(Module &M) {
   const TargetData &TD = TM.getTargetData();
   std::string CurSection;
 
@@ -487,3 +565,145 @@ bool PPC32AsmPrinter::doFinalization(Module &M) {
   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
+}