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7836fc129a
Every function has the address of its frame in the beginning of code section. The frame address is retrieved and used to pass arguments. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68597 91177308-0d34-0410-b5e6-96231b3b80d8
414 lines
14 KiB
C++
414 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/DerivedTypes.h"
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#include "llvm/Function.h"
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#include "llvm/Module.h"
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#include "llvm/CodeGen/DwarfWriter.h"
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#include "llvm/CodeGen/MachineFrameInfo.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/CodeGen/DwarfWriter.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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using namespace llvm;
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#include "PIC16GenAsmWriter.inc"
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inline static bool isLocalToFunc (std::string &FuncName, std::string &VarName) {
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if (VarName.find(FuncName + ".auto.") != std::string::npos
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|| VarName.find(FuncName + ".arg.") != std::string::npos)
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return true;
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return false;
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}
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inline static bool isLocalName (std::string &Name) {
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if (Name.find(".auto.") != std::string::npos
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|| Name.find(".arg.") != std::string::npos)
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return true;
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return false;
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}
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bool PIC16AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
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std::string NewBank = "";
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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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unsigned BankSelVar = Operands - 2;
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// In cases where an instruction has a def or use defined in td file,
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// that def or use becomes a machine instruction operand.
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// eg. addfw_1 instruction defines STATUS register. So the machine
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// instruction for it has MO_Register Operand as its last operand.
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while ((MI->getOperand(BankSelVar + 1).getType() ==
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MachineOperand::MO_Register) && (BankSelVar > 0))
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BankSelVar--;
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const MachineOperand &Op = MI->getOperand(BankSelVar);
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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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NewBank = Op.getGlobal()->getSection();
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else {
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// External Symbol is generated for temp data. Temp data in in
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// fdata.<functionname>.# section.
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NewBank = "fdata." + CurrentFnName +".#";
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}
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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(BankSelVar+1);
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// If Section names are same then the variables are in same section.
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// This is not true for external variables as section names for global
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// variables in all files are same at this time. For eg. initialized
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// data in put in idata.# section in all files.
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if (((int)BS.getImm() == 1) &&
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((Op.isGlobal() && Op.getGlobal()->hasExternalLinkage()) ||
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(NewBank.compare(CurBank) != 0))) {
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O << "\tbanksel ";
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printOperand(MI, BankSelVar);
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O << "\n";
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CurBank = NewBank;
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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->MF = &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 + ".# " + "CODE";
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const Section *fCodeSection = TAI->getNamedSection(codeSection.c_str(),
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SectionFlags::Code);
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O << "\n";
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SwitchToSection (fCodeSection);
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O << CurrentFnName << ":\n";
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O << " retlw low(" << CurrentFnName << ".frame)\n";
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O << " retlw high(" << CurrentFnName << ".frame)\n";
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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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CurBank = "";
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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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bool fast, bool verbose) {
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return new PIC16AsmPrinter(o, tm, tm.getTargetAsmInfo(), fast, verbose);
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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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case MachineOperand::MO_MachineBasicBlock:
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printBasicBlockLabel(MO.getMBB());
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return;
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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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void PIC16AsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) {
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int CC = (int)MI->getOperand(opNum).getImm();
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O << PIC16CondCodeToString((PIC16CC::CondCodes)CC);
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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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MachineModuleInfo *MMI = getAnalysisIfAvailable<MachineModuleInfo>();
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assert(MMI);
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DwarfWriter *DW = getAnalysisIfAvailable<DwarfWriter>();
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assert(DW && "Dwarf Writer is not available");
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DW->BeginModule(&M, MMI, O, this, TAI);
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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 header file to include declaration of library functions
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O << "\t#include C16IntrinsicCalls.INC\n";
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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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// Any variables reaching here with ".auto." 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 (isLocalName (Name))
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continue;
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if (I->isDeclaration())
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O << "\textern "<< Name << "\n";
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else if (I->hasCommonLinkage() || I->hasExternalLinkage())
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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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SwitchToSection(TAI->getDataSection());
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for (Module::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 (isLocalName(Name))
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continue;
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I->setSection(TAI->getDataSection()->getName());
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O << Name;
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EmitGlobalConstant(C, AddrSpace);
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}
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}
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}
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void PIC16AsmPrinter::EmitRomData (Module &M)
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{
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SwitchToSection(TAI->getReadOnlySection());
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IsRomData = true;
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for (Module::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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I->setSection(TAI->getReadOnlySection()->getName());
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O << name;
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EmitGlobalConstant(C, AddrSpace);
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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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SwitchToSection(TAI->getBSSSection_());
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const TargetData *TD = TM.getTargetData();
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for (Module::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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I->setSection(TAI->getBSSSection_()->getName());
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const Type *Ty = C->getType();
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unsigned Size = TD->getTypePaddedSize(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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Module *M = const_cast<Module *>(F->getParent());
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const TargetData *TD = TM.getTargetData();
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unsigned FrameSize = 0;
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// Emit the data section name.
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O << "\n";
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std::string SectionName = "fdata." + CurrentFnName + ".# " + "UDATA";
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const Section *fDataSection = TAI->getNamedSection(SectionName.c_str(),
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SectionFlags::Writeable);
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SwitchToSection(fDataSection);
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// Emit function frame label
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O << CurrentFnName << ".frame:\n";
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const Type *RetType = F->getReturnType();
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unsigned RetSize = 0;
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if (RetType->getTypeID() != Type::VoidTyID)
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RetSize = TD->getTypePaddedSize(RetType);
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//Emit function return value space
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if(RetSize > 0)
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O << CurrentFnName << ".retval RES " << RetSize << "\n";
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else
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O << CurrentFnName << ".retval:\n";
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// Emit variable to hold the space for function arguments
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unsigned ArgSize = 0;
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for (Function::const_arg_iterator argi = F->arg_begin(),
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arge = F->arg_end(); argi != arge ; ++argi) {
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const Type *Ty = argi->getType();
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ArgSize += TD->getTypePaddedSize(Ty);
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}
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O << CurrentFnName << ".args RES " << ArgSize << "\n";
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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::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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// Static local varilabes of a function does not have .auto. in their
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// name. They are not printed as part of function data but module
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// level global data.
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if (! isLocalToFunc(FuncName, VarName))
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continue;
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I->setSection("fdata." + CurrentFnName + ".#");
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Constant *C = I->getInitializer();
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const Type *Ty = C->getType();
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unsigned Size = TD->getTypePaddedSize(Ty);
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FrameSize += Size;
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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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int TempSize = PTLI->GetTmpSize();
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if (TempSize > 0 )
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O << CurrentFnName << ".tmp RES " << TempSize <<"\n";
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}
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