mirror of
https://github.com/c64scene-ar/llvm-6502.git
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8f78fa827e
Custom lower AND, OR, XOR bitwise operations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60098 91177308-0d34-0410-b5e6-96231b3b80d8
439 lines
14 KiB
C++
439 lines
14 KiB
C++
//===-- PIC16AsmPrinter.cpp - PIC16 LLVM assembly writer ------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains a printer that converts from our internal representation
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// of machine-dependent LLVM code to PIC16 assembly language.
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//
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//===----------------------------------------------------------------------===//
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#include "PIC16AsmPrinter.h"
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#include "PIC16TargetAsmInfo.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/Mangler.h"
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#include "llvm/Function.h"
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#include "llvm/Module.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/DerivedTypes.h"
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using namespace llvm;
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#include "PIC16GenAsmWriter.inc"
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bool PIC16AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
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std::string NewBankselLabel;
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unsigned Operands = MI->getNumOperands();
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if (Operands > 1) {
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// Global address or external symbol should be second operand from last
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// if we want to print banksel for it.
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const MachineOperand &Op = MI->getOperand(Operands-2);
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unsigned OpType = Op.getType();
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if (OpType == MachineOperand::MO_GlobalAddress ||
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OpType == MachineOperand::MO_ExternalSymbol) {
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if (OpType == MachineOperand::MO_GlobalAddress )
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NewBankselLabel = Mang->getValueName(Op.getGlobal());
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else
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NewBankselLabel = Op.getSymbolName();
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// Operand after global address or external symbol should be banksel.
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// Value 1 for this operand means we need to generate banksel else do not
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// generate banksel.
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const MachineOperand &BS = MI->getOperand(Operands-1);
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if (((int)BS.getImm() == 1) &&
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(strcmp (CurrentBankselLabelInBasicBlock.c_str(),
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NewBankselLabel.c_str()))) {
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CurrentBankselLabelInBasicBlock = NewBankselLabel;
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O << "\tbanksel ";
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printOperand(MI, Operands-2);
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O << "\n";
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}
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}
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}
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printInstruction(MI);
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return true;
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}
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/// runOnMachineFunction - This uses the printInstruction()
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/// method to print assembly for each instruction.
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///
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bool PIC16AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
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// This calls the base class function required to be called at beginning
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// of runOnMachineFunction.
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SetupMachineFunction(MF);
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// Get the mangled name.
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const Function *F = MF.getFunction();
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CurrentFnName = Mang->getValueName(F);
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// Emit the function variables.
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emitFunctionData(MF);
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std::string codeSection;
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codeSection = "code." + CurrentFnName + ".#";
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O << "\n";
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SwitchToTextSection (codeSection.c_str(),F);
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// Print out code for the function.
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for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
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I != E; ++I) {
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// Print a label for the basic block.
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if (I != MF.begin()) {
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printBasicBlockLabel(I, true);
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O << '\n';
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}
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else
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O << CurrentFnName << ":\n";
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CurrentBankselLabelInBasicBlock = "";
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for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
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II != E; ++II) {
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// Print the assembly for the instruction.
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printMachineInstruction(II);
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}
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}
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return false; // we didn't modify anything.
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}
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/// createPIC16CodePrinterPass - Returns a pass that prints the PIC16
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/// assembly code for a MachineFunction to the given output stream,
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/// using the given target machine description. This should work
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/// regardless of whether the function is in SSA form.
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///
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FunctionPass *llvm::createPIC16CodePrinterPass(raw_ostream &o,
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PIC16TargetMachine &tm) {
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return new PIC16AsmPrinter(o, tm, tm.getTargetAsmInfo());
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}
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void PIC16AsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
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const MachineOperand &MO = MI->getOperand(opNum);
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switch (MO.getType()) {
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case MachineOperand::MO_Register:
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if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
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O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
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else
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assert(0 && "not implemented");
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return;
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case MachineOperand::MO_Immediate:
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O << (int)MO.getImm();
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return;
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case MachineOperand::MO_GlobalAddress:
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O << Mang->getValueName(MO.getGlobal());
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break;
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case MachineOperand::MO_ExternalSymbol:
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O << MO.getSymbolName();
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break;
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default:
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assert(0 && " Operand type not supported.");
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}
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}
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bool PIC16AsmPrinter::doInitialization (Module &M) {
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bool Result = AsmPrinter::doInitialization(M);
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// FIXME:: This is temporary solution to generate the include file.
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// The processor should be passed to llc as in input and the header file
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// should be generated accordingly.
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O << "\t#include P16F1937.INC\n";
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EmitExternsAndGlobals (M);
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EmitInitData (M);
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EmitUnInitData(M);
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EmitRomData(M);
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return Result;
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}
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void PIC16AsmPrinter::EmitExternsAndGlobals (Module &M) {
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// Emit declarations for external functions.
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O << "section.0" <<"\n";
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for (Module::iterator I = M.begin(), E = M.end(); I != E; I++) {
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std::string Name = Mang->getValueName(I);
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if (Name.compare("abort") == 0)
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continue;
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if (I->isDeclaration()) {
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O << "\textern " <<Name << "\n";
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O << "\textern " << Name << ".retval\n";
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O << "\textern " << Name << ".args\n";
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}
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else if (I->hasExternalLinkage()) {
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O << "\tglobal " << Name << "\n";
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O << "\tglobal " << Name << ".retval\n";
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O << "\tglobal " << Name << ".args\n";
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}
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}
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// Emit declarations for external globals.
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for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
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I != E; I++) {
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std::string Name = Mang->getValueName(I);
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if (I->isDeclaration())
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O << "\textern "<< Name << "\n";
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else if (I->getLinkage() == GlobalValue::CommonLinkage)
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O << "\tglobal "<< Name << "\n";
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}
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}
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void PIC16AsmPrinter::EmitInitData (Module &M) {
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std::string iDataSection = "idata.#";
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SwitchToDataSection(iDataSection.c_str());
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for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
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I != E; ++I) {
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if (!I->hasInitializer()) // External global require no code.
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continue;
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Constant *C = I->getInitializer();
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const PointerType *PtrTy = I->getType();
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int AddrSpace = PtrTy->getAddressSpace();
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if ((!C->isNullValue()) && (AddrSpace == PIC16ISD::RAM_SPACE)) {
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if (EmitSpecialLLVMGlobal(I))
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continue;
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// Any variables reaching here with "." in its name is a local scope
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// variable and should not be printed in global data section.
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std::string name = Mang->getValueName(I);
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if (name.find(".") != std::string::npos)
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continue;
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O << name;
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EmitGlobalConstant(C);
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}
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}
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}
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void PIC16AsmPrinter::EmitConstantValueOnly(const Constant* CV) {
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if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
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unsigned BitWidth = CI->getBitWidth();
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int Val = CI->getZExtValue();
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if (BitWidth == 8) {
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// Expecting db directive here. In case of romdata we need to pad the
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// word with zeros.
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if (IsRomData)
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O << 0 <<", ";
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O << Val;
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}
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else if (BitWidth == 16) {
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unsigned Element1, Element2;
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Element1 = 0x00ff & Val;
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Element2 = 0x00ff & (Val >> 8);
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if (IsRomData)
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O << 0 <<", "<<Element1 <<", "<< 0 <<", "<< Element2;
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else
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O << Element1 <<", "<< Element2;
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}
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else if (BitWidth == 32) {
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unsigned Element1, Element2, Element3, Element4;
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Element1 = 0x00ff & Val;
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Element2 = 0x00ff & (Val >> 8);
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Element3 = 0x00ff & (Val >> 16);
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Element4 = 0x00ff & (Val >> 24);
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if (IsRomData)
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O << 0 <<", "<< Element1 <<", "<< 0 <<", "<< Element2 <<", "<< 0
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<<", "<< Element3 <<", "<< 0 <<", "<< Element4;
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else
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O << Element1 <<", "<< Element2 <<", "<< Element3 <<", "<< Element4;
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}
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return;
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}
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AsmPrinter::EmitConstantValueOnly(CV);
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}
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void PIC16AsmPrinter::EmitRomData (Module &M)
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{
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std::string romDataSection = "romdata.#";
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SwitchToRomDataSection(romDataSection.c_str());
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IsRomData = true;
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for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
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I != E; ++I) {
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if (!I->hasInitializer()) // External global require no code.
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continue;
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Constant *C = I->getInitializer();
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const PointerType *PtrTy = I->getType();
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int AddrSpace = PtrTy->getAddressSpace();
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if ((!C->isNullValue()) && (AddrSpace == PIC16ISD::ROM_SPACE)) {
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if (EmitSpecialLLVMGlobal(I))
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continue;
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// Any variables reaching here with "." in its name is a local scope
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// variable and should not be printed in global data section.
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std::string name = Mang->getValueName(I);
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if (name.find(".") != std::string::npos)
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continue;
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O << name;
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EmitGlobalConstant(C);
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O << "\n";
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}
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}
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IsRomData = false;
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}
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void PIC16AsmPrinter::EmitUnInitData (Module &M)
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{
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std::string uDataSection = "udata.#";
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SwitchToUDataSection(uDataSection.c_str());
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const TargetData *TD = TM.getTargetData();
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for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
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I != E; ++I) {
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if (!I->hasInitializer()) // External global require no code.
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continue;
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Constant *C = I->getInitializer();
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if (C->isNullValue()) {
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if (EmitSpecialLLVMGlobal(I))
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continue;
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// Any variables reaching here with "." in its name is a local scope
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// variable and should not be printed in global data section.
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std::string name = Mang->getValueName(I);
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if (name.find(".") != std::string::npos)
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continue;
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const Type *Ty = C->getType();
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unsigned Size = TD->getABITypeSize(Ty);
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O << name << " " <<"RES"<< " " << Size ;
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O << "\n";
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}
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}
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}
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bool PIC16AsmPrinter::doFinalization(Module &M) {
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O << "\t" << "END\n";
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bool Result = AsmPrinter::doFinalization(M);
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return Result;
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}
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void PIC16AsmPrinter::emitFunctionData(MachineFunction &MF) {
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const Function *F = MF.getFunction();
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std::string FuncName = Mang->getValueName(F);
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const Module *M = F->getParent();
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const TargetData *TD = TM.getTargetData();
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// Emit the data section name.
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O << "\n";
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std::string fDataSection = "fdata." + CurrentFnName + ".#";
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SwitchToUDataSection(fDataSection.c_str(), F);
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//Emit function return value.
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O << CurrentFnName << ".retval:\n";
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const Type *RetType = F->getReturnType();
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if (RetType->getTypeID() != Type::VoidTyID) {
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unsigned RetSize = TD->getABITypeSize(RetType);
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if (RetSize > 0)
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O << CurrentFnName << ".retval" << " RES " << RetSize;
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}
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// Emit function arguments.
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O << CurrentFnName << ".args:\n";
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for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
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AI != AE; ++AI) {
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std::string ArgName = Mang->getValueName(AI);
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const Type *ArgTy = AI->getType();
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unsigned ArgSize = TD->getABITypeSize(ArgTy);
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O << CurrentFnName << ".args." << ArgName << " RES " << ArgSize;
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}
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// Emit the function variables.
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// In PIC16 all the function arguments and local variables are global.
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// Therefore to get the variable belonging to this function entire
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// global list will be traversed and variables belonging to this function
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// will be emitted in the current data section.
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for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
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I != E; ++I) {
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std::string VarName = Mang->getValueName(I);
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// The variables of a function are of form FuncName.* . If this variable
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// does not belong to this function then continue.
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if (!(VarName.find(FuncName + ".") == 0 ? true : false))
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continue;
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Constant *C = I->getInitializer();
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const Type *Ty = C->getType();
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unsigned Size = TD->getABITypeSize(Ty);
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// Emit memory reserve directive.
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O << VarName << " RES " << Size << "\n";
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}
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emitFunctionTempData(MF);
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}
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void PIC16AsmPrinter::emitFunctionTempData(MachineFunction &MF) {
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// Emit temporary variables.
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MachineFrameInfo *FrameInfo = MF.getFrameInfo();
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if (FrameInfo->hasStackObjects()) {
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int indexBegin = FrameInfo->getObjectIndexBegin();
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int indexEnd = FrameInfo->getObjectIndexEnd();
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if (indexBegin < indexEnd)
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O << CurrentFnName << ".tmp RES"<< " "
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<<indexEnd - indexBegin <<"\n";
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/*
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while (indexBegin < indexEnd) {
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O << CurrentFnName << "_tmp_" << indexBegin << " " << "RES"<< " "
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<< 1 << "\n" ;
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indexBegin++;
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}
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*/
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}
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}
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/// The function is same as AsmPrinter::SwitchtoDataSection except the call
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/// to getUDataSectionStartSuffix.
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void PIC16AsmPrinter::SwitchToUDataSection(const char *NewSection,
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const GlobalValue *GV) {
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std::string NS;
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if (GV && GV->hasSection())
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NS = TAI->getSwitchToSectionDirective() + GV->getSection();
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else
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NS = NewSection;
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// If we're already in this section, we're done.
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if (CurrentSection == NS) return;
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// Close the current section, if applicable.
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if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
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O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n';
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CurrentSection = NS;
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if (!CurrentSection.empty()){}
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O << CurrentSection << (static_cast<const PIC16TargetAsmInfo *>(TAI))->
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getUDataSectionStartSuffix() << '\n';
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IsInTextSection = false;
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}
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/// The function is same as AsmPrinter::SwitchtoDataSection except the call
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/// to getRomDataSectionStartSuffix.
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void PIC16AsmPrinter::SwitchToRomDataSection(const char *NewSection,
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const GlobalValue *GV) {
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std::string NS;
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if (GV && GV->hasSection())
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NS = TAI->getSwitchToSectionDirective() + GV->getSection();
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else
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NS = NewSection;
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// If we're already in this section, we're done.
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if (CurrentSection == NS) return;
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// Close the current section, if applicable.
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if (TAI->getSectionEndDirectiveSuffix() && !CurrentSection.empty())
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O << CurrentSection << TAI->getSectionEndDirectiveSuffix() << '\n';
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CurrentSection = NS;
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if (!CurrentSection.empty()) {}
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O << CurrentSection << (static_cast< const PIC16TargetAsmInfo *>(TAI))->
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getRomDataSectionStartSuffix() << '\n';
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IsInTextSection = false;
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}
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