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llvm-65816/lib/Target/WDC65816/WDC65816AsmPrinter.cpp

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//===-- WDC65816AsmPrinter.cpp - WDC65816 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 GAS-format SPARC assembly language.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "asm-printer"
#include "WDC65816.h"
#include "WDC65816InstrInfo.h"
#include "WDC65816TargetMachine.h"
#include "MCTargetDesc/WDC65816BaseInfo.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/Mangler.h"
using namespace llvm;
namespace {
class WDC65816AsmPrinter : public AsmPrinter {
public:
explicit WDC65816AsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
: AsmPrinter(TM, Streamer) {}
virtual const char *getPassName() const {
return "WDC65816 Assembly Printer";
}
void printInstruction(const MachineInstr *MI, raw_ostream &OS);// autogen'd.
void printOperand(const MachineInstr *MI, int opNum, raw_ostream &OS);
void printMemOperand(const MachineInstr *MI, int opNum, raw_ostream &OS,
const char *Modifier = 0);
bool printGetPCX(const MachineInstr *MI, unsigned OpNo, raw_ostream &OS);
static const char *getRegisterName(unsigned RegNo);
#if 0 // WDC_TODO - How much of this do we need?
void printCCOperand(const MachineInstr *MI, int opNum, raw_ostream &OS);
virtual void EmitFunctionBodyStart();
virtual void EmitInstruction(const MachineInstr *MI) {
SmallString<128> Str;
raw_svector_ostream OS(Str);
printInstruction(MI, OS);
OutStreamer.EmitRawText(OS.str());
}
bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant, const char *ExtraCode,
raw_ostream &O);
bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant, const char *ExtraCode,
raw_ostream &O);
virtual bool isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB)
const;
void EmitGlobalRegisterDecl(unsigned reg) {
SmallString<128> Str;
raw_svector_ostream OS(Str);
OS << "\t.register "
<< "%" << StringRef(getRegisterName(reg)).lower()
<< ", "
<< ((reg == SP::G6 || reg == SP::G7)? "#ignore" : "#scratch");
OutStreamer.EmitRawText(OS.str());
}
#endif
};
} // end of anonymous namespace
#include "WDC65816GenAsmWriter.inc"
void WDC65816AsmPrinter::printOperand(const MachineInstr *MI, int opNum,
raw_ostream &O) {
// WDC_TODO - print the operand here...
}
void WDC65816AsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
raw_ostream &O, const char *Modifier) {
// WDC_TODO - print the memory operand here...
}
bool WDC65816AsmPrinter::printGetPCX(const MachineInstr *MI, unsigned opNum,
raw_ostream &O) {
// WDC_TODO - print whatever this is here...
return true;
}
#if 0 // WDC_TODO - How much of this do we need?
void WDC65816AsmPrinter::EmitFunctionBodyStart() {
const MachineRegisterInfo &MRI = MF->getRegInfo();
const unsigned globalRegs[] = { SP::G2, SP::G3, SP::G6, SP::G7, 0 };
for (unsigned i = 0; globalRegs[i] != 0; ++i) {
unsigned reg = globalRegs[i];
if (MRI.use_empty(reg))
continue;
EmitGlobalRegisterDecl(reg);
}
}
void WDC65816AsmPrinter::printOperand(const MachineInstr *MI, int opNum,
raw_ostream &O) {
const MachineOperand &MO = MI->getOperand (opNum);
unsigned TF = MO.getTargetFlags();
#ifndef NDEBUG
// Verify the target flags.
if (MO.isGlobal() || MO.isSymbol() || MO.isCPI()) {
if (MI->getOpcode() == SP::CALL)
assert(TF == SPII::MO_NO_FLAG &&
"Cannot handle target flags on call address");
else if (MI->getOpcode() == SP::SETHIi)
assert((TF == SPII::MO_HI || TF == SPII::MO_H44 || TF == SPII::MO_HH
|| TF == SPII::MO_TLS_GD_HI22
|| TF == SPII::MO_TLS_LDM_HI22
|| TF == SPII::MO_TLS_LDO_HIX22
|| TF == SPII::MO_TLS_IE_HI22
|| TF == SPII::MO_TLS_LE_HIX22) &&
"Invalid target flags for address operand on sethi");
else if (MI->getOpcode() == SP::TLS_CALL)
assert((TF == SPII::MO_NO_FLAG
|| TF == SPII::MO_TLS_GD_CALL
|| TF == SPII::MO_TLS_LDM_CALL) &&
"Cannot handle target flags on tls call address");
else if (MI->getOpcode() == SP::TLS_ADDrr)
assert((TF == SPII::MO_TLS_GD_ADD || TF == SPII::MO_TLS_LDM_ADD
|| TF == SPII::MO_TLS_LDO_ADD || TF == SPII::MO_TLS_IE_ADD) &&
"Cannot handle target flags on add for TLS");
else if (MI->getOpcode() == SP::TLS_LDrr)
assert(TF == SPII::MO_TLS_IE_LD &&
"Cannot handle target flags on ld for TLS");
else if (MI->getOpcode() == SP::TLS_LDXrr)
assert(TF == SPII::MO_TLS_IE_LDX &&
"Cannot handle target flags on ldx for TLS");
else if (MI->getOpcode() == SP::XORri)
assert((TF == SPII::MO_TLS_LDO_LOX10 || TF == SPII::MO_TLS_LE_LOX10) &&
"Cannot handle target flags on xor for TLS");
else
assert((TF == SPII::MO_LO || TF == SPII::MO_M44 || TF == SPII::MO_L44
|| TF == SPII::MO_HM
|| TF == SPII::MO_TLS_GD_LO10
|| TF == SPII::MO_TLS_LDM_LO10
|| TF == SPII::MO_TLS_IE_LO10 ) &&
"Invalid target flags for small address operand");
}
#endif
bool CloseParen = true;
switch (TF) {
default:
llvm_unreachable("Unknown target flags on operand");
case SPII::MO_NO_FLAG:
CloseParen = false;
break;
case SPII::MO_LO: O << "%lo("; break;
case SPII::MO_HI: O << "%hi("; break;
case SPII::MO_H44: O << "%h44("; break;
case SPII::MO_M44: O << "%m44("; break;
case SPII::MO_L44: O << "%l44("; break;
case SPII::MO_HH: O << "%hh("; break;
case SPII::MO_HM: O << "%hm("; break;
case SPII::MO_TLS_GD_HI22: O << "%tgd_hi22("; break;
case SPII::MO_TLS_GD_LO10: O << "%tgd_lo10("; break;
case SPII::MO_TLS_GD_ADD: O << "%tgd_add("; break;
case SPII::MO_TLS_GD_CALL: O << "%tgd_call("; break;
case SPII::MO_TLS_LDM_HI22: O << "%tldm_hi22("; break;
case SPII::MO_TLS_LDM_LO10: O << "%tldm_lo10("; break;
case SPII::MO_TLS_LDM_ADD: O << "%tldm_add("; break;
case SPII::MO_TLS_LDM_CALL: O << "%tldm_call("; break;
case SPII::MO_TLS_LDO_HIX22: O << "%tldo_hix22("; break;
case SPII::MO_TLS_LDO_LOX10: O << "%tldo_lox10("; break;
case SPII::MO_TLS_LDO_ADD: O << "%tldo_add("; break;
case SPII::MO_TLS_IE_HI22: O << "%tie_hi22("; break;
case SPII::MO_TLS_IE_LO10: O << "%tie_lo10("; break;
case SPII::MO_TLS_IE_LD: O << "%tie_ld("; break;
case SPII::MO_TLS_IE_LDX: O << "%tie_ldx("; break;
case SPII::MO_TLS_IE_ADD: O << "%tie_add("; break;
case SPII::MO_TLS_LE_HIX22: O << "%tle_hix22("; break;
case SPII::MO_TLS_LE_LOX10: O << "%tle_lox10("; break;
}
switch (MO.getType()) {
case MachineOperand::MO_Register:
O << "%" << StringRef(getRegisterName(MO.getReg())).lower();
break;
case MachineOperand::MO_Immediate:
O << (int)MO.getImm();
break;
case MachineOperand::MO_MachineBasicBlock:
O << *MO.getMBB()->getSymbol();
return;
case MachineOperand::MO_GlobalAddress:
O << *getSymbol(MO.getGlobal());
break;
case MachineOperand::MO_BlockAddress:
O << GetBlockAddressSymbol(MO.getBlockAddress())->getName();
break;
case MachineOperand::MO_ExternalSymbol:
O << MO.getSymbolName();
break;
case MachineOperand::MO_ConstantPoolIndex:
O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
<< MO.getIndex();
break;
default:
llvm_unreachable("<unknown operand type>");
}
if (CloseParen) O << ")";
}
void WDC65816AsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
raw_ostream &O, const char *Modifier) {
printOperand(MI, opNum, O);
// If this is an ADD operand, emit it like normal operands.
if (Modifier && !strcmp(Modifier, "arith")) {
O << ", ";
printOperand(MI, opNum+1, O);
return;
}
if (MI->getOperand(opNum+1).isReg() &&
MI->getOperand(opNum+1).getReg() == SP::G0)
return; // don't print "+%g0"
if (MI->getOperand(opNum+1).isImm() &&
MI->getOperand(opNum+1).getImm() == 0)
return; // don't print "+0"
O << "+";
printOperand(MI, opNum+1, O);
}
bool WDC65816AsmPrinter::printGetPCX(const MachineInstr *MI, unsigned opNum,
raw_ostream &O) {
std::string operand = "";
const MachineOperand &MO = MI->getOperand(opNum);
switch (MO.getType()) {
default: llvm_unreachable("Operand is not a register");
case MachineOperand::MO_Register:
assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
"Operand is not a physical register ");
assert(MO.getReg() != SP::O7 &&
"%o7 is assigned as destination for getpcx!");
operand = "%" + StringRef(getRegisterName(MO.getReg())).lower();
break;
}
unsigned mfNum = MI->getParent()->getParent()->getFunctionNumber();
unsigned bbNum = MI->getParent()->getNumber();
O << '\n' << ".LLGETPCH" << mfNum << '_' << bbNum << ":\n";
O << "\tcall\t.LLGETPC" << mfNum << '_' << bbNum << '\n' ;
O << "\t sethi\t"
<< "%hi(_GLOBAL_OFFSET_TABLE_+(.-.LLGETPCH" << mfNum << '_' << bbNum
<< ")), " << operand << '\n' ;
O << ".LLGETPC" << mfNum << '_' << bbNum << ":\n" ;
O << "\tor\t" << operand
<< ", %lo(_GLOBAL_OFFSET_TABLE_+(.-.LLGETPCH" << mfNum << '_' << bbNum
<< ")), " << operand << '\n';
O << "\tadd\t" << operand << ", %o7, " << operand << '\n';
return true;
}
void WDC65816AsmPrinter::printCCOperand(const MachineInstr *MI, int opNum,
raw_ostream &O) {
int CC = (int)MI->getOperand(opNum).getImm();
O << SPARCCondCodeToString((SPCC::CondCodes)CC);
}
/// PrintAsmOperand - Print out an operand for an inline asm expression.
///
bool WDC65816AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant,
const char *ExtraCode,
raw_ostream &O) {
if (ExtraCode && ExtraCode[0]) {
if (ExtraCode[1] != 0) return true; // Unknown modifier.
switch (ExtraCode[0]) {
default:
// See if this is a generic print operand
return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O);
case 'r':
break;
}
}
printOperand(MI, OpNo, O);
return false;
}
bool WDC65816AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
unsigned OpNo, unsigned AsmVariant,
const char *ExtraCode,
raw_ostream &O) {
if (ExtraCode && ExtraCode[0])
return true; // Unknown modifier
O << '[';
printMemOperand(MI, OpNo, O);
O << ']';
return false;
}
/// isBlockOnlyReachableByFallthough - Return true if the basic block has
/// exactly one predecessor and the control transfer mechanism between
/// the predecessor and this block is a fall-through.
///
/// This overrides AsmPrinter's implementation to handle delay slots.
bool WDC65816AsmPrinter::
isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const {
// If this is a landing pad, it isn't a fall through. If it has no preds,
// then nothing falls through to it.
if (MBB->isLandingPad() || MBB->pred_empty())
return false;
// If there isn't exactly one predecessor, it can't be a fall through.
MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(), PI2 = PI;
++PI2;
if (PI2 != MBB->pred_end())
return false;
// The predecessor has to be immediately before this block.
const MachineBasicBlock *Pred = *PI;
if (!Pred->isLayoutSuccessor(MBB))
return false;
// Check if the last terminator is an unconditional branch.
MachineBasicBlock::const_iterator I = Pred->end();
while (I != Pred->begin() && !(--I)->isTerminator())
; // Noop
return I == Pred->end() || !I->isBarrier();
}
#endif
// Force static initialization.
extern "C" void LLVMInitializeWDC65816AsmPrinter() {
RegisterAsmPrinter<WDC65816AsmPrinter> X(TheWDC65816Target);
}
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