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llvm-6502/lib/Target/PIC16/PIC16AsmPrinter.cpp

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//===-- 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::inSameBank (char *s1, char *s2){
assert (s1 && s2 && "Null pointer assignment");
if ((*s1 == '.') && (*s2 == '.')) { //skip if they both start with '.'
s1++;
s2++;
}
while (*s1 && *s2) {
if (*s1 != *s2)
goto _NotInSameBank;
if ((*s1 == '.') && (*s2 == '.')) //both symbols in same function
goto _InSameBank; //in the same bank
s1++;
s2++;
}
if (*s1 && *s1) {
_InSameBank:
return true;
}
_NotInSameBank:
return false;
}
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) &&
(!inSameBank ((char *)CurrentBankselLabelInBasicBlock.c_str(),
(char *)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 + ".# " + "CODE";
const Section *fCodeSection = TAI->getNamedSection(codeSection.c_str(),
SectionFlags::Code);
O << "\n";
SwitchToSection (fCodeSection);
// 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;
case MachineOperand::MO_MachineBasicBlock:
printBasicBlockLabel(MO.getMBB());
return;
default:
assert(0 && " Operand type not supported.");
}
}
void PIC16AsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) {
int CC = (int)MI->getOperand(opNum).getImm();
O << PIC16CondCodeToString((PIC16CC::CondCodes)CC);
}
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";
EmitExternsAndGlobals (M);
EmitInitData (M);
EmitUnInitData(M);
EmitRomData(M);
return Result;
}
void PIC16AsmPrinter::EmitExternsAndGlobals (Module &M) {
// Emit declarations for external functions.
O << "section.0" <<"\n";
for (Module::iterator I = M.begin(), E = M.end(); I != E; I++) {
std::string Name = Mang->getValueName(I);
if (Name.compare("abort") == 0)
continue;
if (I->isDeclaration()) {
O << "\textern " <<Name << "\n";
O << "\textern " << Name << ".retval\n";
O << "\textern " << Name << ".args\n";
}
else if (I->hasExternalLinkage()) {
O << "\tglobal " << Name << "\n";
O << "\tglobal " << Name << ".retval\n";
O << "\tglobal " << Name << ".args\n";
}
}
// Emit header file to include declaration of library functions
O << "\t#include C16IntrinsicCalls.INC\n";
// Emit declarations for external globals.
for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
I != E; I++) {
// Any variables reaching here with ".auto." 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(".auto.") != std::string::npos)
continue;
if (I->isDeclaration())
O << "\textern "<< Name << "\n";
else if (I->hasCommonLinkage() || I->hasExternalLinkage())
O << "\tglobal "<< Name << "\n";
}
}
void PIC16AsmPrinter::EmitInitData (Module &M) {
SwitchToSection(TAI->getDataSection());
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(".auto.") != std::string::npos)
continue;
O << name;
EmitGlobalConstant(C, AddrSpace);
}
}
}
void PIC16AsmPrinter::EmitRomData (Module &M)
{
SwitchToSection(TAI->getReadOnlySection());
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, AddrSpace);
O << "\n";
}
}
IsRomData = false;
}
void PIC16AsmPrinter::EmitUnInitData (Module &M)
{
SwitchToSection(TAI->getBSSSection_());
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->getTypePaddedSize(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();
unsigned FrameSize = 0;
// Emit the data section name.
O << "\n";
std::string SectionName = "fdata." + CurrentFnName + ".# " + "UDATA";
const Section *fDataSection = TAI->getNamedSection(SectionName.c_str(),
SectionFlags::Writeable);
SwitchToSection(fDataSection);
//Emit function return value.
O << CurrentFnName << ".retval:\n";
const Type *RetType = F->getReturnType();
unsigned RetSize = 0;
if (RetType->getTypeID() != Type::VoidTyID)
RetSize = TD->getTypePaddedSize(RetType);
// Emit function arguments.
O << CurrentFnName << ".args:\n";
// Emit the function variables.
// 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.
// Static local varilabes of a function does not have .auto. in their
// name. They are not printed as part of function data but module
// level global data.
if (!(VarName.find(FuncName + ".auto.") == 0 ? true : false))
continue;
Constant *C = I->getInitializer();
const Type *Ty = C->getType();
unsigned Size = TD->getTypePaddedSize(Ty);
FrameSize += Size;
// Emit memory reserve directive.
O << VarName << " RES " << Size << "\n";
}
// Return value can not overlap with temp data, becasue a temp slot
// may be read/written after a return value is calculated and saved
// within the function.
if (RetSize > FrameSize)
O << CurrentFnName << ".dummy" << " RES " << (RetSize - FrameSize) << "\n";
emitFunctionTempData(MF, FrameSize);
}
void PIC16AsmPrinter::emitFunctionTempData(MachineFunction &MF,
unsigned &FrameSize) {
// Emit temporary variables.
MachineFrameInfo *FrameInfo = MF.getFrameInfo();
if (FrameInfo->hasStackObjects()) {
int indexBegin = FrameInfo->getObjectIndexBegin();
int indexEnd = FrameInfo->getObjectIndexEnd();
if (indexBegin < indexEnd) {
FrameSize += indexEnd - indexBegin;
O << CurrentFnName << ".tmp RES"<< " "
<<indexEnd - indexBegin <<"\n";
}
/*
while (indexBegin < indexEnd) {
O << CurrentFnName << "_tmp_" << indexBegin << " " << "RES"<< " "
<< 1 << "\n" ;
indexBegin++;
}
*/
}
}
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