lib/Target/PIC16/PIC16AsmPrinter.cpp - fp2-dev/platform/external/llvm - Gitiles

 //===-- PIC16AsmPrinter.cpp - PIC16 LLVM assembly writer ------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file 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 PIC16 assembly language.
 //
 //===----------------------------------------------------------------------===//

 #include "PIC16AsmPrinter.h"
 #include "PIC16TargetAsmInfo.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Support/Mangler.h"
 #include "llvm/Function.h"
 #include "llvm/Module.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/DerivedTypes.h"

 using namespace llvm;

 #include "PIC16GenAsmWriter.inc"

 bool PIC16AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
   std::string NewBankselLabel;
   unsigned Operands = MI->getNumOperands();
   if (Operands > 1) {
     // Global address or external symbol should be second operand from last
     // if we want to print banksel for it.
     const MachineOperand &Op = MI->getOperand(Operands-2);
     unsigned OpType = Op.getType();
     if (OpType == MachineOperand::MO_GlobalAddress ||
         OpType == MachineOperand::MO_ExternalSymbol) {
       if (OpType == MachineOperand::MO_GlobalAddress )
         NewBankselLabel =  Mang->getValueName(Op.getGlobal());
       else
         NewBankselLabel =  Op.getSymbolName();

       // Operand after global address or external symbol should be  banksel.
       // Value 1 for this operand means we need to generate banksel else do not
       // generate banksel.
       const MachineOperand &BS = MI->getOperand(Operands-1);
       if (((int)BS.getImm() == 1) &&
           (strcmp (CurrentBankselLabelInBasicBlock.c_str(),
                    NewBankselLabel.c_str()))) {
         CurrentBankselLabelInBasicBlock = NewBankselLabel;
         O << "\tbanksel ";
         printOperand(MI, Operands-2);
         O << "\n";
       }
     }
   }
   printInstruction(MI);
   return true;
 }

 /// runOnMachineFunction - This uses the printInstruction()
 /// method to print assembly for each instruction.
 ///
 bool PIC16AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
   // This calls the base class function required to be called at beginning
   // of runOnMachineFunction.
   SetupMachineFunction(MF);

   // Get the mangled name.
   const Function *F = MF.getFunction();
   CurrentFnName = Mang->getValueName(F);

   // Emit the function variables.
   emitFunctionData(MF);
   std::string codeSection;
   codeSection = "code." + CurrentFnName + ".#";
   O <<  "\n";
   SwitchToTextSection (codeSection.c_str(),F);

   // 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.
     if (I != MF.begin()) {
       printBasicBlockLabel(I, true);
       O << '\n';
     }
     else
       O << "_" << CurrentFnName << ":\n";
     CurrentBankselLabelInBasicBlock = "";
     for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
          II != E; ++II) {
       // Print the assembly for the instruction.
         printMachineInstruction(II);
     }
   }
   return false;  // we didn't modify anything.
 }

 /// createPIC16CodePrinterPass - Returns a pass that prints the PIC16
 /// 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.
 ///
 FunctionPass *llvm::createPIC16CodePrinterPass(raw_ostream &o,
                                                PIC16TargetMachine &tm) {
   return new PIC16AsmPrinter(o, tm, tm.getTargetAsmInfo());
 }

 void PIC16AsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
   const MachineOperand &MO = MI->getOperand(opNum);

   switch (MO.getType()) {
     case MachineOperand::MO_Register:
       if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
         O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
       else
         assert(0 && "not implemented");
         return;

     case MachineOperand::MO_Immediate:
       O << (int)MO.getImm();
       return;

     case MachineOperand::MO_GlobalAddress:
       O << Mang->getValueName(MO.getGlobal());
       break;

     case MachineOperand::MO_ExternalSymbol:
       O << MO.getSymbolName();
       break;

     default:
       assert(0 && " Operand type not supported.");
   }
 }

 bool PIC16AsmPrinter::doInitialization (Module &M) {
   bool Result = AsmPrinter::doInitialization(M);
   // FIXME:: This is temporary solution to generate the include file.
   // The processor should be passed to llc as in input and the header file
   // should be generated accordingly.
   O << "\t#include P16F1937.INC\n";

   EmitInitData (M);
   EmitUnInitData(M);
   EmitRomData(M);
   return Result;
 }

 void PIC16AsmPrinter::EmitInitData (Module &M)
 {
   std::string iDataSection = "idata.#";
   SwitchToDataSection(iDataSection.c_str());
   for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
        I != E; ++I) {
     if (!I->hasInitializer())   // External global require no code.
       continue;

     Constant *C = I->getInitializer();
     const PointerType *PtrTy = I->getType();
     int AddrSpace = PtrTy->getAddressSpace();

     if ((!C->isNullValue()) && (AddrSpace == PIC16ISD::RAM_SPACE)) {

       if (EmitSpecialLLVMGlobal(I))
         continue;

       // Any variables reaching here with "." in its name is a local scope
       // variable and should not be printed in global data section.
       std::string name = Mang->getValueName(I);
       if (name.find(".") != std::string::npos)
         continue;

       O << name;
       EmitGlobalConstant(C);
     }
   }
 }

 void PIC16AsmPrinter::EmitConstantValueOnly(const Constant* CV) {
   if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
     unsigned BitWidth = CI->getBitWidth();
     int Val = CI->getZExtValue();
     if (BitWidth == 8) {
       // Expecting db directive here. In case of romdata we need to pad the
       // word with zeros.
       if (IsRomData)
         O << 0 <<", ";
       O << Val;
     }
     else if (BitWidth == 16) {
       unsigned Element1, Element2;
       Element1 = 0x00ff & Val;
       Element2 = 0x00ff & (Val >> 8);
       if (IsRomData)
         O << 0 <<", "<<Element1 <<", "<< 0 <<", "<< Element2;
       else
         O << Element1 <<", "<< Element2;
     }
     else if (BitWidth == 32) {
       unsigned Element1, Element2, Element3, Element4;
       Element1 = 0x00ff & Val;
       Element2 = 0x00ff & (Val >> 8);
       Element3 = 0x00ff & (Val >> 16);
       Element4 = 0x00ff & (Val >> 24);
       if (IsRomData)
         O << 0 <<", "<< Element1 <<", "<< 0 <<", "<< Element2 <<", "<< 0
           <<", "<< Element3 <<", "<< 0 <<", "<< Element4;
       else
         O << Element1 <<", "<< Element2 <<", "<< Element3 <<", "<< Element4;
     }
     return;
   }
   AsmPrinter::EmitConstantValueOnly(CV);
 }

 void PIC16AsmPrinter::EmitRomData (Module &M)
 {
   std::string romDataSection = "romdata.#";
   SwitchToRomDataSection(romDataSection.c_str());
   IsRomData = true;
   for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
        I != E; ++I) {
     if (!I->hasInitializer())   // External global require no code.
       continue;

     Constant *C = I->getInitializer();
     const PointerType *PtrTy = I->getType();
     int AddrSpace = PtrTy->getAddressSpace();
     if ((!C->isNullValue()) && (AddrSpace == PIC16ISD::ROM_SPACE)) {

       if (EmitSpecialLLVMGlobal(I))
         continue;

       // Any variables reaching here with "." in its name is a local scope
       // variable and should not be printed in global data section.
       std::string name = Mang->getValueName(I);
       if (name.find(".") != std::string::npos)
         continue;

       O << name;
       EmitGlobalConstant(C);
       O << "\n";
     }
   }
   IsRomData = false;
 }


 void PIC16AsmPrinter::EmitUnInitData (Module &M)
 {
   std::string uDataSection = "udata.#";
   SwitchToUDataSection(uDataSection.c_str());
   const TargetData *TD = TM.getTargetData();

   for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
        I != E; ++I) {
     if (!I->hasInitializer())   // External global require no code.
       continue;

     Constant *C = I->getInitializer();
     if (C->isNullValue()) {

       if (EmitSpecialLLVMGlobal(I))
         continue;

       // Any variables reaching here with "." in its name is a local scope
       // variable and should not be printed in global data section.
       std::string name = Mang->getValueName(I);
       if (name.find(".") != std::string::npos)
         continue;

       const Type *Ty = C->getType();
       unsigned Size = TD->getABITypeSize(Ty);
       O << name << " " <<"RES"<< " " << Size ;
       O << "\n";
     }
   }
 }

 bool PIC16AsmPrinter::doFinalization(Module &M) {
   O << "\t" << "END\n";
   bool Result = AsmPrinter::doFinalization(M);
   return Result;
 }

 void PIC16AsmPrinter::emitFunctionData(MachineFunction &MF) {
   const Function *F = MF.getFunction();
   std::string FuncName = Mang->getValueName(F);
   const Module *M = F->getParent();
   const TargetData *TD = TM.getTargetData();

   // Emit the data section name.
   O << "\n";
   std::string fDataSection = "fdata." + CurrentFnName + ".#";
   SwitchToUDataSection(fDataSection.c_str(), F);
   // Emit the label for data section of current function.
   O << "_frame_" << CurrentFnName << ":" ;
   O << "\n";

   // Emit the function variables.

   if (F->hasExternalLinkage()) {
     O << "\t" << "GLOBAL _frame_"  << CurrentFnName << "\n";
     O << "\t" << "GLOBAL _"  << CurrentFnName << "\n";
   }
   // In PIC16 all the function arguments and local variables are global.
   // Therefore to get the variable belonging to this function entire
   // global list will be traversed and variables belonging to this function
   // will be emitted in the current data section.
   for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
        I != E; ++I) {
     std::string VarName = Mang->getValueName(I);

     // The variables of a function are of form FuncName.* . If this variable
     // does not belong to this function then continue.
     if (!(VarName.find(FuncName + ".") == 0 ? true : false))
       continue;

     Constant *C = I->getInitializer();
     const Type *Ty = C->getType();
     unsigned Size = TD->getABITypeSize(Ty);
     // Emit memory reserve directive.
     O << VarName << "  RES  " << Size << "\n";
   }
   emitFunctionTempData(MF);
 }

 void PIC16AsmPrinter::emitFunctionTempData(MachineFunction &MF) {
   // Emit temporary variables.
   MachineFrameInfo *FrameInfo = MF.getFrameInfo();
   if (FrameInfo->hasStackObjects()) {
     int indexBegin = FrameInfo->getObjectIndexBegin();
     int indexEnd = FrameInfo->getObjectIndexEnd();

     if (indexBegin < indexEnd)
       O << CurrentFnName << ".tmp RES"<< " "
         <<indexEnd - indexBegin <<"\n";
     /*
     while (indexBegin < indexEnd) {
         O << CurrentFnName << "_tmp_" << indexBegin << " " << "RES"<< " "
           << 1 << "\n" ;
         indexBegin++;
     }
     */
   }
 }

 /// The function is same as AsmPrinter::SwitchtoDataSection except the call
 /// to getUDataSectionStartSuffix.
 void PIC16AsmPrinter::SwitchToUDataSection(const char *NewSection,
                                            const GlobalValue *GV) {
   std::string NS;
   if (GV && GV->hasSection())
     NS = TAI->getSwitchToSectionDirective() + GV->getSection();
   else
     NS = NewSection;

   // If we're already in this section, we're done.
   if (CurrentSection == NS) return;

   // Close the current section, if applicable.
   if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
     O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n';

   CurrentSection = NS;

   if (!CurrentSection.empty()){}
     O << CurrentSection << (static_cast<const PIC16TargetAsmInfo *>(TAI))->
                             getUDataSectionStartSuffix() << '\n';

   IsInTextSection = false;
 }

 /// The function is same as AsmPrinter::SwitchtoDataSection except the call
 /// to getRomDataSectionStartSuffix.
 void PIC16AsmPrinter::SwitchToRomDataSection(const char *NewSection,
                                              const GlobalValue *GV) {
   std::string NS;
   if (GV && GV->hasSection())
     NS = TAI->getSwitchToSectionDirective() + GV->getSection();
   else
     NS = NewSection;

   // If we're already in this section, we're done.
   if (CurrentSection == NS) return;

   // Close the current section, if applicable.
   if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
     O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n';

   CurrentSection = NS;

   if (!CurrentSection.empty()) {}
     O << CurrentSection << (static_cast< const PIC16TargetAsmInfo *>(TAI))->
                             getRomDataSectionStartSuffix() << '\n';

   IsInTextSection = false;
 }
	//===-- PIC16AsmPrinter.cpp - PIC16 LLVM assembly writer ------------------===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file 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 PIC16 assembly language.
	//
	//===----------------------------------------------------------------------===//

	#include "PIC16AsmPrinter.h"
	#include "PIC16TargetAsmInfo.h"
	#include "llvm/Support/raw_ostream.h"
	#include "llvm/Support/Mangler.h"
	#include "llvm/Function.h"
	#include "llvm/Module.h"
	#include "llvm/CodeGen/MachineFrameInfo.h"
	#include "llvm/DerivedTypes.h"

	using namespace llvm;

	#include "PIC16GenAsmWriter.inc"

	bool PIC16AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
	std::string NewBankselLabel;
	unsigned Operands = MI->getNumOperands();
	if (Operands > 1) {
	// Global address or external symbol should be second operand from last
	// if we want to print banksel for it.
	const MachineOperand &Op = MI->getOperand(Operands-2);
	unsigned OpType = Op.getType();
	if (OpType == MachineOperand::MO_GlobalAddress \|\|
	OpType == MachineOperand::MO_ExternalSymbol) {
	if (OpType == MachineOperand::MO_GlobalAddress )
	NewBankselLabel = Mang->getValueName(Op.getGlobal());
	else
	NewBankselLabel = Op.getSymbolName();

	// Operand after global address or external symbol should be banksel.
	// Value 1 for this operand means we need to generate banksel else do not
	// generate banksel.
	const MachineOperand &BS = MI->getOperand(Operands-1);
	if (((int)BS.getImm() == 1) &&
	(strcmp (CurrentBankselLabelInBasicBlock.c_str(),
	NewBankselLabel.c_str()))) {
	CurrentBankselLabelInBasicBlock = NewBankselLabel;
	O << "\tbanksel ";
	printOperand(MI, Operands-2);
	O << "\n";
	}
	}
	}
	printInstruction(MI);
	return true;
	}

	/// runOnMachineFunction - This uses the printInstruction()
	/// method to print assembly for each instruction.
	///
	bool PIC16AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
	// This calls the base class function required to be called at beginning
	// of runOnMachineFunction.
	SetupMachineFunction(MF);

	// Get the mangled name.
	const Function *F = MF.getFunction();
	CurrentFnName = Mang->getValueName(F);

	// Emit the function variables.
	emitFunctionData(MF);
	std::string codeSection;
	codeSection = "code." + CurrentFnName + ".#";
	O << "\n";
	SwitchToTextSection (codeSection.c_str(),F);

	// 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.
	if (I != MF.begin()) {
	printBasicBlockLabel(I, true);
	O << '\n';
	}
	else
	O << "_" << CurrentFnName << ":\n";
	CurrentBankselLabelInBasicBlock = "";
	for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
	II != E; ++II) {
	// Print the assembly for the instruction.
	printMachineInstruction(II);
	}
	}
	return false; // we didn't modify anything.
	}

	/// createPIC16CodePrinterPass - Returns a pass that prints the PIC16
	/// 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.
	///
	FunctionPass *llvm::createPIC16CodePrinterPass(raw_ostream &o,
	PIC16TargetMachine &tm) {
	return new PIC16AsmPrinter(o, tm, tm.getTargetAsmInfo());
	}

	void PIC16AsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
	const MachineOperand &MO = MI->getOperand(opNum);

	switch (MO.getType()) {
	case MachineOperand::MO_Register:
	if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
	O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
	else
	assert(0 && "not implemented");
	return;

	case MachineOperand::MO_Immediate:
	O << (int)MO.getImm();
	return;

	case MachineOperand::MO_GlobalAddress:
	O << Mang->getValueName(MO.getGlobal());
	break;

	case MachineOperand::MO_ExternalSymbol:
	O << MO.getSymbolName();
	break;

	default:
	assert(0 && " Operand type not supported.");
	}
	}

	bool PIC16AsmPrinter::doInitialization (Module &M) {
	bool Result = AsmPrinter::doInitialization(M);
	// FIXME:: This is temporary solution to generate the include file.
	// The processor should be passed to llc as in input and the header file
	// should be generated accordingly.
	O << "\t#include P16F1937.INC\n";

	EmitInitData (M);
	EmitUnInitData(M);
	EmitRomData(M);
	return Result;
	}

	void PIC16AsmPrinter::EmitInitData (Module &M)
	{
	std::string iDataSection = "idata.#";
	SwitchToDataSection(iDataSection.c_str());
	for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
	I != E; ++I) {
	if (!I->hasInitializer()) // External global require no code.
	continue;

	Constant *C = I->getInitializer();
	const PointerType *PtrTy = I->getType();
	int AddrSpace = PtrTy->getAddressSpace();

	if ((!C->isNullValue()) && (AddrSpace == PIC16ISD::RAM_SPACE)) {

	if (EmitSpecialLLVMGlobal(I))
	continue;

	// Any variables reaching here with "." in its name is a local scope
	// variable and should not be printed in global data section.
	std::string name = Mang->getValueName(I);
	if (name.find(".") != std::string::npos)
	continue;

	O << name;
	EmitGlobalConstant(C);
	}
	}
	}

	void PIC16AsmPrinter::EmitConstantValueOnly(const Constant* CV) {
	if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
	unsigned BitWidth = CI->getBitWidth();
	int Val = CI->getZExtValue();
	if (BitWidth == 8) {
	// Expecting db directive here. In case of romdata we need to pad the
	// word with zeros.
	if (IsRomData)
	O << 0 <<", ";
	O << Val;
	}
	else if (BitWidth == 16) {
	unsigned Element1, Element2;
	Element1 = 0x00ff & Val;
	Element2 = 0x00ff & (Val >> 8);
	if (IsRomData)
	O << 0 <<", "<<Element1 <<", "<< 0 <<", "<< Element2;
	else
	O << Element1 <<", "<< Element2;
	}
	else if (BitWidth == 32) {
	unsigned Element1, Element2, Element3, Element4;
	Element1 = 0x00ff & Val;
	Element2 = 0x00ff & (Val >> 8);
	Element3 = 0x00ff & (Val >> 16);
	Element4 = 0x00ff & (Val >> 24);
	if (IsRomData)
	O << 0 <<", "<< Element1 <<", "<< 0 <<", "<< Element2 <<", "<< 0
	<<", "<< Element3 <<", "<< 0 <<", "<< Element4;
	else
	O << Element1 <<", "<< Element2 <<", "<< Element3 <<", "<< Element4;
	}
	return;
	}
	AsmPrinter::EmitConstantValueOnly(CV);
	}

	void PIC16AsmPrinter::EmitRomData (Module &M)
	{
	std::string romDataSection = "romdata.#";
	SwitchToRomDataSection(romDataSection.c_str());
	IsRomData = true;
	for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
	I != E; ++I) {
	if (!I->hasInitializer()) // External global require no code.
	continue;

	Constant *C = I->getInitializer();
	const PointerType *PtrTy = I->getType();
	int AddrSpace = PtrTy->getAddressSpace();
	if ((!C->isNullValue()) && (AddrSpace == PIC16ISD::ROM_SPACE)) {

	if (EmitSpecialLLVMGlobal(I))
	continue;

	// Any variables reaching here with "." in its name is a local scope
	// variable and should not be printed in global data section.
	std::string name = Mang->getValueName(I);
	if (name.find(".") != std::string::npos)
	continue;

	O << name;
	EmitGlobalConstant(C);
	O << "\n";
	}
	}
	IsRomData = false;
	}


	void PIC16AsmPrinter::EmitUnInitData (Module &M)
	{
	std::string uDataSection = "udata.#";
	SwitchToUDataSection(uDataSection.c_str());
	const TargetData *TD = TM.getTargetData();

	for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
	I != E; ++I) {
	if (!I->hasInitializer()) // External global require no code.
	continue;

	Constant *C = I->getInitializer();
	if (C->isNullValue()) {

	if (EmitSpecialLLVMGlobal(I))
	continue;

	// Any variables reaching here with "." in its name is a local scope
	// variable and should not be printed in global data section.
	std::string name = Mang->getValueName(I);
	if (name.find(".") != std::string::npos)
	continue;

	const Type *Ty = C->getType();
	unsigned Size = TD->getABITypeSize(Ty);
	O << name << " " <<"RES"<< " " << Size ;
	O << "\n";
	}
	}
	}

	bool PIC16AsmPrinter::doFinalization(Module &M) {
	O << "\t" << "END\n";
	bool Result = AsmPrinter::doFinalization(M);
	return Result;
	}

	void PIC16AsmPrinter::emitFunctionData(MachineFunction &MF) {
	const Function *F = MF.getFunction();
	std::string FuncName = Mang->getValueName(F);
	const Module *M = F->getParent();
	const TargetData *TD = TM.getTargetData();

	// Emit the data section name.
	O << "\n";
	std::string fDataSection = "fdata." + CurrentFnName + ".#";
	SwitchToUDataSection(fDataSection.c_str(), F);
	// Emit the label for data section of current function.
	O << "_frame_" << CurrentFnName << ":" ;
	O << "\n";

	// Emit the function variables.

	if (F->hasExternalLinkage()) {
	O << "\t" << "GLOBAL _frame_" << CurrentFnName << "\n";
	O << "\t" << "GLOBAL _" << CurrentFnName << "\n";
	}
	// In PIC16 all the function arguments and local variables are global.
	// Therefore to get the variable belonging to this function entire
	// global list will be traversed and variables belonging to this function
	// will be emitted in the current data section.
	for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
	I != E; ++I) {
	std::string VarName = Mang->getValueName(I);

	// The variables of a function are of form FuncName.* . If this variable
	// does not belong to this function then continue.
	if (!(VarName.find(FuncName + ".") == 0 ? true : false))
	continue;

	Constant *C = I->getInitializer();
	const Type *Ty = C->getType();
	unsigned Size = TD->getABITypeSize(Ty);
	// Emit memory reserve directive.
	O << VarName << " RES " << Size << "\n";
	}
	emitFunctionTempData(MF);
	}

	void PIC16AsmPrinter::emitFunctionTempData(MachineFunction &MF) {
	// Emit temporary variables.
	MachineFrameInfo *FrameInfo = MF.getFrameInfo();
	if (FrameInfo->hasStackObjects()) {
	int indexBegin = FrameInfo->getObjectIndexBegin();
	int indexEnd = FrameInfo->getObjectIndexEnd();

	if (indexBegin < indexEnd)
	O << CurrentFnName << ".tmp RES"<< " "
	<<indexEnd - indexBegin <<"\n";
	/*
	while (indexBegin < indexEnd) {
	O << CurrentFnName << "_tmp_" << indexBegin << " " << "RES"<< " "
	<< 1 << "\n" ;
	indexBegin++;
	}
	*/
	}
	}

	/// The function is same as AsmPrinter::SwitchtoDataSection except the call
	/// to getUDataSectionStartSuffix.
	void PIC16AsmPrinter::SwitchToUDataSection(const char *NewSection,
	const GlobalValue *GV) {
	std::string NS;
	if (GV && GV->hasSection())
	NS = TAI->getSwitchToSectionDirective() + GV->getSection();
	else
	NS = NewSection;

	// If we're already in this section, we're done.
	if (CurrentSection == NS) return;

	// Close the current section, if applicable.
	if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
	O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n';

	CurrentSection = NS;

	if (!CurrentSection.empty()){}
	O << CurrentSection << (static_cast<const PIC16TargetAsmInfo *>(TAI))->
	getUDataSectionStartSuffix() << '\n';

	IsInTextSection = false;
	}

	/// The function is same as AsmPrinter::SwitchtoDataSection except the call
	/// to getRomDataSectionStartSuffix.
	void PIC16AsmPrinter::SwitchToRomDataSection(const char *NewSection,
	const GlobalValue *GV) {
	std::string NS;
	if (GV && GV->hasSection())
	NS = TAI->getSwitchToSectionDirective() + GV->getSection();
	else
	NS = NewSection;

	// If we're already in this section, we're done.
	if (CurrentSection == NS) return;

	// Close the current section, if applicable.
	if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
	O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n';

	CurrentSection = NS;

	if (!CurrentSection.empty()) {}
	O << CurrentSection << (static_cast< const PIC16TargetAsmInfo *>(TAI))->
	getRomDataSectionStartSuffix() << '\n';

	IsInTextSection = false;
	}