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.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "asm-printer"
#include "PIC16.h"
#include "PIC16TargetMachine.h"
#include "PIC16ConstantPoolValue.h"
#include "PIC16InstrInfo.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Mangler.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Target/TargetAsmInfo.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include <cctype>
using namespace llvm;
STATISTIC(EmittedInsts, "Number of machine instrs printed");
namespace {
struct VISIBILITY_HIDDEN PIC16AsmPrinter : public AsmPrinter {
PIC16AsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
: AsmPrinter(O, TM, T) {
}
/// We name each basic block in a Function with a unique number, so
/// that we can consistently refer to them later. This is cleared
/// at the beginning of each call to runOnMachineFunction().
///
typedef std::map<const Value *, unsigned> ValueMapTy;
ValueMapTy NumberForBB;
/// Keeps the set of GlobalValues that require non-lazy-pointers for
/// indirect access.
std::set<std::string> GVNonLazyPtrs;
/// Keeps the set of external function GlobalAddresses that the asm
/// printer should generate stubs for.
std::set<std::string> FnStubs;
/// True if asm printer is printing a series of CONSTPOOL_ENTRY.
bool InCPMode;
virtual const char *getPassName() const {
return "PIC16 Assembly Printer";
}
void printOperand(const MachineInstr *MI, int opNum,
const char *Modifier = 0);
void printSOImmOperand(const MachineInstr *MI, int opNum);
void printAddrModeOperand(const MachineInstr *MI, int OpNo);
void printRegisterList(const MachineInstr *MI, int opNum);
void printCPInstOperand(const MachineInstr *MI, int opNum,
const char *Modifier);
bool printInstruction(const MachineInstr *MI); // autogenerated.
void emitFunctionStart(MachineFunction &F);
bool runOnMachineFunction(MachineFunction &F);
bool doInitialization(Module &M);
bool doFinalization(Module &M);
virtual void EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV);
void getAnalysisUsage(AnalysisUsage &AU) const;
public:
void SwitchToTextSection(const char *NewSection,
const GlobalValue *GV = NULL);
void SwitchToDataSection(const char *NewSection,
const GlobalValue *GV = NULL);
void SwitchToDataOvrSection(const char *NewSection,
const GlobalValue *GV = NULL);
};
} // end of anonymous namespace
#include "PIC16GenAsmWriter.inc"
/// 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(std::ostream &o,
PIC16TargetMachine &tm) {
return new PIC16AsmPrinter(o, tm, tm.getTargetAsmInfo());
}
void PIC16AsmPrinter::getAnalysisUsage(AnalysisUsage &AU) const
{
// FIXME: Currently unimplemented.
}
void PIC16AsmPrinter ::
EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV)
{
printDataDirective(MCPV->getType());
PIC16ConstantPoolValue *ACPV = (PIC16ConstantPoolValue*)MCPV;
GlobalValue *GV = ACPV->getGV();
std::string Name = GV ? Mang->getValueName(GV) : TAI->getGlobalPrefix();
if (!GV)
Name += ACPV->getSymbol();
if (ACPV->isNonLazyPointer()) {
GVNonLazyPtrs.insert(Name);
O << TAI->getPrivateGlobalPrefix() << Name << "$non_lazy_ptr";
} else if (ACPV->isStub()) {
FnStubs.insert(Name);
O << TAI->getPrivateGlobalPrefix() << Name << "$stub";
} else {
O << Name;
}
if (ACPV->hasModifier()) O << "(" << ACPV->getModifier() << ")";
if (ACPV->getPCAdjustment() != 0) {
O << "-(" << TAI->getPrivateGlobalPrefix() << "PC"
<< utostr(ACPV->getLabelId())
<< "+" << (unsigned)ACPV->getPCAdjustment();
if (ACPV->mustAddCurrentAddress())
O << "-.";
O << ")";
}
O << "\n";
// If the constant pool value is a extern weak symbol, remember to emit
// the weak reference.
if (GV && GV->hasExternalWeakLinkage())
ExtWeakSymbols.insert(GV);
}
/// emitFunctionStart - Emit the directives used by ASM on the start of
/// functions.
void PIC16AsmPrinter::emitFunctionStart(MachineFunction &MF)
{
// Print out the label for the function.
const Function *F = MF.getFunction();
MachineFrameInfo *FrameInfo = MF.getFrameInfo();
if (FrameInfo->hasStackObjects()) {
int indexBegin = FrameInfo->getObjectIndexBegin();
int indexEnd = FrameInfo->getObjectIndexEnd();
while (indexBegin < indexEnd) {
if (indexBegin == 0)
SwitchToDataOvrSection(F->getParent()->getModuleIdentifier().c_str(),
F);
O << "\t\t" << CurrentFnName << "_" << indexBegin << " " << "RES"
<< " " << FrameInfo->getObjectSize(indexBegin) << "\n" ;
indexBegin++;
}
}
SwitchToTextSection(CurrentFnName.c_str(), F);
O << "_" << CurrentFnName << ":" ;
O << "\n";
}
/// runOnMachineFunction - This uses the printInstruction()
/// method to print assembly for each instruction.
///
bool PIC16AsmPrinter::runOnMachineFunction(MachineFunction &MF)
{
SetupMachineFunction(MF);
O << "\n";
// What's my mangled name?
CurrentFnName = Mang->getValueName(MF.getFunction());
// Emit the function start directives
emitFunctionStart(MF);
// 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';
}
for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
II != E; ++II) {
// Print the assembly for the instruction.
O << '\t';
printInstruction(II);
++EmittedInsts;
}
}
// We didn't modify anything.
return false;
}
void PIC16AsmPrinter::
printOperand(const MachineInstr *MI, int opNum, const char *Modifier)
{
const MachineOperand &MO = MI->getOperand(opNum);
const TargetRegisterInfo &RI = *TM.getRegisterInfo();
switch (MO.getType()) {
case MachineOperand::MO_Register:
if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
O << RI.get(MO.getReg()).Name;
else
assert(0 && "not implemented");
break;
case MachineOperand::MO_Immediate:
if (!Modifier || strcmp(Modifier, "no_hash") != 0)
O << "#";
O << (int)MO.getImm();
break;
case MachineOperand::MO_MachineBasicBlock:
printBasicBlockLabel(MO.getMBB());
return;
case MachineOperand::MO_GlobalAddress:
O << Mang->getValueName(MO.getGlobal())<<'+'<<MO.getOffset();
break;
case MachineOperand::MO_ExternalSymbol:
O << MO.getSymbolName();
break;
case MachineOperand::MO_ConstantPoolIndex:
O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
<< '_' << MO.getIndex();
break;
case MachineOperand::MO_FrameIndex:
O << "_" << CurrentFnName
<< '+' << MO.getIndex();
break;
case MachineOperand::MO_JumpTableIndex:
O << TAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
<< '_' << MO.getIndex();
break;
default:
O << "<unknown operand type>"; abort ();
break;
} // end switch.
}
static void
printSOImm(std::ostream &O, int64_t V, const TargetAsmInfo *TAI)
{
assert(V < (1 << 12) && "Not a valid so_imm value!");
O << (unsigned) V;
}
/// printSOImmOperand - SOImm is 4-bit rotated amount in bits 8-11 with 8-bit
/// immediate in bits 0-7.
void PIC16AsmPrinter::printSOImmOperand(const MachineInstr *MI, int OpNum)
{
const MachineOperand &MO = MI->getOperand(OpNum);
assert(MO.isImmediate() && "Not a valid so_imm value!");
printSOImm(O, MO.getImm(), TAI);
}
void PIC16AsmPrinter::printAddrModeOperand(const MachineInstr *MI, int Op)
{
const MachineOperand &MO1 = MI->getOperand(Op);
const MachineOperand &MO2 = MI->getOperand(Op+1);
if (MO2.isFrameIndex ()) {
printOperand(MI, Op+1);
return;
}
if (!MO1.isRegister()) {
// FIXME: This is for CP entries, but isn't right.
printOperand(MI, Op);
return;
}
// If this is Stack Slot
if (MO1.isRegister()) {
if (strcmp(TM.getRegisterInfo()->get(MO1.getReg()).Name, "SP") == 0) {
O << CurrentFnName <<"_"<< MO2.getImm();
return;
}
O << "[" << TM.getRegisterInfo()->get(MO1.getReg()).Name;
O << "+";
O << MO2.getImm();
O << "]";
return;
}
O << "[" << TM.getRegisterInfo()->get(MO1.getReg()).Name;
O << "]";
}
void PIC16AsmPrinter::printRegisterList(const MachineInstr *MI, int opNum)
{
O << "{";
for (unsigned i = opNum, e = MI->getNumOperands(); i != e; ++i) {
printOperand(MI, i);
if (i != e-1) O << ", ";
}
O << "}";
}
void PIC16AsmPrinter::
printCPInstOperand(const MachineInstr *MI, int OpNo, const char *Modifier)
{
assert(Modifier && "This operand only works with a modifier!");
// There are two aspects to a CONSTANTPOOL_ENTRY operand, the label and the
// data itself.
if (!strcmp(Modifier, "label")) {
unsigned ID = MI->getOperand(OpNo).getImm();
O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber()
<< '_' << ID << ":\n";
} else {
assert(!strcmp(Modifier, "cpentry") && "Unknown modifier for CPE");
unsigned CPI = MI->getOperand(OpNo).getIndex();
const MachineConstantPoolEntry &MCPE = // Chasing pointers is fun?
MI->getParent()->getParent()->getConstantPool()->getConstants()[CPI];
if (MCPE.isMachineConstantPoolEntry())
EmitMachineConstantPoolValue(MCPE.Val.MachineCPVal);
else {
EmitGlobalConstant(MCPE.Val.ConstVal);
// remember to emit the weak reference
if (const GlobalValue *GV = dyn_cast<GlobalValue>(MCPE.Val.ConstVal))
if (GV->hasExternalWeakLinkage())
ExtWeakSymbols.insert(GV);
}
}
}
bool PIC16AsmPrinter::doInitialization(Module &M)
{
bool Result = AsmPrinter::doInitialization(M);
return Result;
}
bool PIC16AsmPrinter::doFinalization(Module &M)
{
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;
if (EmitSpecialLLVMGlobal(I)) {
continue;
}
std::string name = Mang->getValueName(I);
Constant *C = I->getInitializer();
const Type *Ty = C->getType();
unsigned Size = TD->getABITypeSize(Ty);
unsigned Align = TD->getPreferredAlignmentLog(I);
const char *VisibilityDirective = NULL;
if (I->hasHiddenVisibility())
VisibilityDirective = TAI->getHiddenDirective();
else if (I->hasProtectedVisibility())
VisibilityDirective = TAI->getProtectedDirective();
if (VisibilityDirective)
O << VisibilityDirective << name << "\n";
if (C->isNullValue()) {
if (I->hasExternalLinkage()) {
if (const char *Directive = TAI->getZeroFillDirective()) {
O << "\t.globl\t" << name << "\n";
O << Directive << "__DATA__, __common, " << name << ", "
<< Size << ", " << Align << "\n";
continue;
}
}
if (!I->hasSection() &&
(I->hasInternalLinkage() || I->hasWeakLinkage() ||
I->hasLinkOnceLinkage() || I->hasCommonLinkage())) {
if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it.
if (!NoZerosInBSS && TAI->getBSSSection())
SwitchToDataSection(M.getModuleIdentifier().c_str(), I);
else
SwitchToDataSection(TAI->getDataSection(), I);
if (TAI->getLCOMMDirective() != NULL) {
if (I->hasInternalLinkage()) {
O << TAI->getLCOMMDirective() << name << "," << Size;
} else
O << TAI->getCOMMDirective() << name << "," << Size;
} else {
if (I->hasInternalLinkage())
O << "\t.local\t" << name << "\n";
O << TAI->getCOMMDirective() <<"\t" << name << " " <<"RES"<< " "
<< Size;
O << "\n\t\tGLOBAL" <<" "<< name;
if (TAI->getCOMMDirectiveTakesAlignment())
O << "," << (TAI->getAlignmentIsInBytes() ? (1 << Align) : Align);
}
continue;
}
}
switch (I->getLinkage()) {
case GlobalValue::AppendingLinkage:
// FIXME: appending linkage variables should go into a section of
// their name or something. For now, just emit them as external.
// FALL THROUGH
case GlobalValue::ExternalLinkage:
O << "\t.globl " << name << "\n";
// FALL THROUGH
case GlobalValue::InternalLinkage:
if (I->isConstant()) {
const ConstantArray *CVA = dyn_cast<ConstantArray>(C);
if (TAI->getCStringSection() && CVA && CVA->isCString()) {
SwitchToDataSection(TAI->getCStringSection(), I);
break;
}
}
break;
default:
assert(0 && "Unknown linkage type!");
break;
} // end switch.
EmitAlignment(Align, I);
O << name << ":\t\t\t\t" << TAI->getCommentString() << " " << I->getName()
<< "\n";
// If the initializer is a extern weak symbol, remember to emit the weak
// reference!
if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
if (GV->hasExternalWeakLinkage())
ExtWeakSymbols.insert(GV);
EmitGlobalConstant(C);
O << '\n';
} // end for.
O << "\n "<< "END";
return AsmPrinter::doFinalization(M);
}
void PIC16AsmPrinter::
SwitchToTextSection(const char *NewSection, const GlobalValue *GV)
{
O << "\n";
if (NewSection && *NewSection) {
std::string codeSection = "code_";
codeSection += NewSection;
codeSection += " ";
codeSection += "CODE";
AsmPrinter::SwitchToTextSection(codeSection.c_str(), GV);
}
else
AsmPrinter::SwitchToTextSection(NewSection, GV);
}
void PIC16AsmPrinter::
SwitchToDataSection(const char *NewSection, const GlobalValue *GV)
{
// Need to append index for page.
O << "\n";
if (NewSection && *NewSection) {
std::string dataSection = "udata_";
dataSection += NewSection;
if (dataSection.substr(dataSection.length() - 2).compare(".o") == 0) {
dataSection = dataSection.substr(0, dataSection.length() - 2);
}
dataSection += " ";
dataSection += "UDATA";
AsmPrinter::SwitchToDataSection(dataSection.c_str(), GV);
}
else
AsmPrinter::SwitchToDataSection(NewSection, GV);
}
void PIC16AsmPrinter::
SwitchToDataOvrSection(const char *NewSection, const GlobalValue *GV)
{
O << "\n";
if (NewSection && *NewSection) {
std::string dataSection = "frame_";
dataSection += NewSection;
if (dataSection.substr(dataSection.length() - 2).compare(".o") == 0) {
dataSection = dataSection.substr(0, dataSection.length() - 2);
}
dataSection += "_";
dataSection += CurrentFnName;
dataSection += " ";
dataSection += "UDATA_OVR";
AsmPrinter::SwitchToDataSection(dataSection.c_str(), GV);
}
else
AsmPrinter::SwitchToDataSection(NewSection, GV);
}