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Emit banksel and movlp instructions.

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Split large global data (both initialized and un-initialized) into multiple sections of <= 80 bytes.
Provide routines to manage PIC16 ABI naming conventions.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71073 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sanjiv Gupta
2009-05-06 08:02:01 +00:00
parent 7af1c78b98
commit d8d27f4a4b
12 changed files with 587 additions and 143 deletions
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170
lib/Target/PIC16/PIC16AsmPrinter.cpp
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@@ -45,51 +45,6 @@ inline static bool isLocalName (std::string &Name) {
}
bool PIC16AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
std::string NewBank = "";
unsigned Operands = MI->getNumOperands();
if (Operands > 1) {
// If we have a Global address or external symbol then we need to print
// banksel for it.
unsigned BankSelVar = 0;
MachineOperand Op = MI->getOperand(BankSelVar);
while (BankSelVar < Operands-1) {
Op = MI->getOperand(BankSelVar);
if ((Op.getType() == MachineOperand::MO_GlobalAddress) ||
(Op.getType() == MachineOperand::MO_ExternalSymbol))
break;
BankSelVar++;
}
if (BankSelVar < Operands-1) {
unsigned OpType = Op.getType();
if (OpType == MachineOperand::MO_GlobalAddress )
NewBank = Op.getGlobal()->getSection();
else {
// External Symbol is generated for temp data and arguments. They are
// in fpdata.<functionname>.# section.
std::string ESName = Op.getSymbolName();
int index = ESName.find_first_of(".");
std::string FnName = ESName.substr(0,index);
NewBank = "fpdata." + FnName +".#";
}
// 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(BankSelVar+1);
// If Section names are same then the variables are in same section.
// This is not true for external variables as section names for global
// variables in all files are same at this time. For eg. initialized
// data in put in idata.# section in all files.
if ((BS.getType() == MachineOperand::MO_Immediate
&& (int)BS.getImm() == 1)
&& ((Op.isGlobal() && Op.getGlobal()->hasExternalLinkage()) ||
(NewBank.compare(CurBank) != 0))) {
O << "\tbanksel ";
printOperand(MI, BankSelVar);
O << "\n";
CurBank = NewBank;
}
}
}
printInstruction(MI);
return true;
}
@@ -118,8 +73,8 @@ bool PIC16AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
SwitchToSection (fCodeSection);
// Emit the frame address of the function at the beginning of code.
O << " retlw low(" << FunctionLabelBegin<< CurrentFnName << ".frame)\n";
O << " retlw high(" << FunctionLabelBegin<< CurrentFnName << ".frame)\n";
O << " retlw low(" << FunctionLabelBegin<< CurrentFnName << ".frame.)\n";
O << " retlw high(" << FunctionLabelBegin<< CurrentFnName << ".frame.)\n";
O << CurrentFnName << ":\n";
@@ -131,7 +86,6 @@ bool PIC16AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
printBasicBlockLabel(I, true);
O << '\n';
}
CurBank = "";
// For emitting line directives, we need to keep track of the current
// source line. When it changes then only emit the line directive.
@@ -225,8 +179,7 @@ bool PIC16AsmPrinter::doInitialization (Module &M) {
DW->BeginModule(&M, MMI, O, this, TAI);
EmitExternsAndGlobals (M);
EmitInitData (M);
EmitUnInitData(M);
EmitGlobalData(M);
EmitRomData(M);
return Result;
}
@@ -245,13 +198,13 @@ void PIC16AsmPrinter::EmitExternsAndGlobals (Module &M) {
if (I->isDeclaration()) {
O << "\textern " <<Name << "\n";
O << "\textern " << FunctionLabelBegin << Name << ".retval\n";
O << "\textern " << FunctionLabelBegin << Name << ".args\n";
O << "\textern " << FunctionLabelBegin << Name << ".ret.\n";
O << "\textern " << FunctionLabelBegin << Name << ".args.\n";
}
else if (I->hasExternalLinkage()) {
O << "\tglobal " << Name << "\n";
O << "\tglobal " << FunctionLabelBegin << Name << ".retval\n";
O << "\tglobal " << FunctionLabelBegin<< Name << ".args\n";
O << "\tglobal " << FunctionLabelBegin << Name << ".ret.\n";
O << "\tglobal " << FunctionLabelBegin<< Name << ".args.\n";
}
}
@@ -274,35 +227,6 @@ void PIC16AsmPrinter::EmitExternsAndGlobals (Module &M) {
}
}
void PIC16AsmPrinter::EmitInitData (Module &M) {
SwitchToSection(TAI->getDataSection());
for (Module::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 (isLocalName(Name))
continue;
I->setSection(TAI->getDataSection()->getName());
O << Name;
EmitGlobalConstant(C, AddrSpace);
}
}
}
void PIC16AsmPrinter::EmitRomData (Module &M)
{
SwitchToSection(TAI->getReadOnlySection());
@@ -335,39 +259,6 @@ void PIC16AsmPrinter::EmitRomData (Module &M)
IsRomData = false;
}
void PIC16AsmPrinter::EmitUnInitData (Module &M)
{
SwitchToSection(TAI->getBSSSection_());
const TargetData *TD = TM.getTargetData();
for (Module::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;
I->setSection(TAI->getBSSSection_()->getName());
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);
@@ -390,7 +281,7 @@ void PIC16AsmPrinter::emitFunctionData(MachineFunction &MF) {
// Emit function frame label
O << FunctionLabelBegin << CurrentFnName << ".frame:\n";
O << FunctionLabelBegin << CurrentFnName << ".frame.:\n";
const Type *RetType = F->getReturnType();
unsigned RetSize = 0;
@@ -399,10 +290,10 @@ void PIC16AsmPrinter::emitFunctionData(MachineFunction &MF) {
//Emit function return value space
if(RetSize > 0)
O << FunctionLabelBegin << CurrentFnName << ".retval RES " << RetSize
O << FunctionLabelBegin << CurrentFnName << ".ret. RES " << RetSize
<< "\n";
else
O << FunctionLabelBegin << CurrentFnName << ".retval:\n";
O << FunctionLabelBegin << CurrentFnName << ".ret.:\n";
// Emit variable to hold the space for function arguments
unsigned ArgSize = 0;
@@ -411,13 +302,13 @@ void PIC16AsmPrinter::emitFunctionData(MachineFunction &MF) {
const Type *Ty = argi->getType();
ArgSize += TD->getTypePaddedSize(Ty);
}
O << FunctionLabelBegin << CurrentFnName << ".args RES " << ArgSize
O << FunctionLabelBegin << CurrentFnName << ".args. RES " << ArgSize
<< "\n";
// Emit temporary space
int TempSize = PTLI->GetTmpSize();
if (TempSize > 0 )
O << FunctionLabelBegin << CurrentFnName << ".tmp RES " << TempSize
O << FunctionLabelBegin << CurrentFnName << ".temp. RES " << TempSize
<<"\n";
// Emit the section name for local variables.
@@ -454,5 +345,40 @@ void PIC16AsmPrinter::emitFunctionData(MachineFunction &MF) {
// Emit memory reserve directive.
O << FunctionLabelBegin << VarName << " RES " << Size << "\n";
}
}
void PIC16AsmPrinter::EmitGlobalData (Module &M)
{
const PIC16TargetAsmInfo *PTAI = static_cast<const PIC16TargetAsmInfo *>(TAI);
const_cast<PIC16TargetAsmInfo *>(PTAI)->SetSectionForGVs(M);
const TargetData *TD = TM.getTargetData();
std::vector <PIC16Section *>IDATASections = PTAI->getIDATASections();
for (unsigned i = 0; i < IDATASections.size(); i++) {
SwitchToSection(IDATASections[i]->S_);
std::vector<const GlobalVariable*> Items = IDATASections[i]->Items;
for (unsigned j = 0; j < Items.size(); j++) {
std::string Name = Mang->getValueName(Items[j]);
Constant *C = Items[j]->getInitializer();
int AddrSpace = Items[j]->getType()->getAddressSpace();
O << Name;
EmitGlobalConstant(C, AddrSpace);
}
}
std::vector <PIC16Section *>BSSSections = PTAI->getBSSSections();
for (unsigned i = 0; i < BSSSections.size(); i++) {
SwitchToSection(BSSSections[i]->S_);
std::vector<const GlobalVariable*> Items = BSSSections[i]->Items;
for (unsigned j = 0; j < Items.size(); j++) {
std::string Name = Mang->getValueName(Items[j]);
Constant *C = Items[j]->getInitializer();
const Type *Ty = C->getType();
unsigned Size = TD->getTypePaddedSize(Ty);
O << Name << " " <<"RES"<< " " << Size ;
O << "\n";
}
}
}