MipsAsmPrinter.cpp [plain text]
#define DEBUG_TYPE "mips-asm-printer"
#include "Mips.h"
#include "MipsSubtarget.h"
#include "MipsInstrInfo.h"
#include "MipsTargetMachine.h"
#include "MipsMachineFunction.h"
#include "llvm/BasicBlock.h"
#include "llvm/Instructions.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/MC/MCStreamer.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Target/Mangler.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetRegistry.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Analysis/DebugInfo.h"
using namespace llvm;
namespace {
class MipsAsmPrinter : public AsmPrinter {
const MipsSubtarget *Subtarget;
public:
explicit MipsAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
: AsmPrinter(TM, Streamer) {
Subtarget = &TM.getSubtarget<MipsSubtarget>();
}
virtual const char *getPassName() const {
return "Mips Assembly Printer";
}
bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant, const char *ExtraCode,
raw_ostream &O);
bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum,
unsigned AsmVariant, const char *ExtraCode,
raw_ostream &O);
void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
void printUnsignedImm(const MachineInstr *MI, int opNum, raw_ostream &O);
void printMemOperand(const MachineInstr *MI, int opNum, raw_ostream &O,
const char *Modifier = 0);
void printFCCOperand(const MachineInstr *MI, int opNum, raw_ostream &O,
const char *Modifier = 0);
void printSavedRegsBitmask(raw_ostream &O);
void printHex32(unsigned int Value, raw_ostream &O);
const char *getCurrentABIString() const;
void emitFrameDirective();
void printInstruction(const MachineInstr *MI, raw_ostream &O); void EmitInstruction(const MachineInstr *MI) {
SmallString<128> Str;
raw_svector_ostream OS(Str);
if (MI->isDebugValue())
PrintDebugValueComment(MI, OS);
printInstruction(MI, OS);
OutStreamer.EmitRawText(OS.str());
}
virtual void EmitFunctionBodyStart();
virtual void EmitFunctionBodyEnd();
virtual bool isBlockOnlyReachableByFallthrough(const MachineBasicBlock*
MBB) const;
static const char *getRegisterName(unsigned RegNo);
virtual void EmitFunctionEntryLabel();
void EmitStartOfAsmFile(Module &M);
virtual MachineLocation getDebugValueLocation(const MachineInstr *MI) const;
void PrintDebugValueComment(const MachineInstr *MI, raw_ostream &OS);
};
}
#include "MipsGenAsmWriter.inc"
void MipsAsmPrinter::printSavedRegsBitmask(raw_ostream &O) {
unsigned CPUBitmask = 0, FPUBitmask = 0;
int CPUTopSavedRegOff, FPUTopSavedRegOff;
const MachineFrameInfo *MFI = MF->getFrameInfo();
const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
unsigned CPURegSize = Mips::CPURegsRegisterClass->getSize();
unsigned FGR32RegSize = Mips::FGR32RegisterClass->getSize();
unsigned AFGR64RegSize = Mips::AFGR64RegisterClass->getSize();
bool HasAFGR64Reg = false;
unsigned CSFPRegsSize = 0;
unsigned i, e = CSI.size();
for (i = 0; i != e; ++i) {
unsigned Reg = CSI[i].getReg();
if (Mips::CPURegsRegisterClass->contains(Reg))
break;
unsigned RegNum = MipsRegisterInfo::getRegisterNumbering(Reg);
if (Mips::AFGR64RegisterClass->contains(Reg)) {
FPUBitmask |= (3 << RegNum);
CSFPRegsSize += AFGR64RegSize;
HasAFGR64Reg = true;
continue;
}
FPUBitmask |= (1 << RegNum);
CSFPRegsSize += FGR32RegSize;
}
for (; i != e; ++i) {
unsigned Reg = CSI[i].getReg();
unsigned RegNum = MipsRegisterInfo::getRegisterNumbering(Reg);
CPUBitmask |= (1 << RegNum);
}
FPUTopSavedRegOff = FPUBitmask ?
(HasAFGR64Reg ? -AFGR64RegSize : -FGR32RegSize) : 0;
CPUTopSavedRegOff = CPUBitmask ? -CSFPRegsSize - CPURegSize : 0;
O << "\t.mask \t"; printHex32(CPUBitmask, O);
O << ',' << CPUTopSavedRegOff << '\n';
O << "\t.fmask\t"; printHex32(FPUBitmask, O);
O << "," << FPUTopSavedRegOff << '\n';
}
void MipsAsmPrinter::printHex32(unsigned Value, raw_ostream &O) {
O << "0x";
for (int i = 7; i >= 0; i--)
O << utohexstr((Value & (0xF << (i*4))) >> (i*4));
}
void MipsAsmPrinter::emitFrameDirective() {
const TargetRegisterInfo &RI = *TM.getRegisterInfo();
unsigned stackReg = RI.getFrameRegister(*MF);
unsigned returnReg = RI.getRARegister();
unsigned stackSize = MF->getFrameInfo()->getStackSize();
OutStreamer.EmitRawText("\t.frame\t$" +
Twine(LowercaseString(getRegisterName(stackReg))) +
"," + Twine(stackSize) + ",$" +
Twine(LowercaseString(getRegisterName(returnReg))));
}
const char *MipsAsmPrinter::getCurrentABIString() const {
switch (Subtarget->getTargetABI()) {
case MipsSubtarget::O32: return "abi32";
case MipsSubtarget::O64: return "abiO64";
case MipsSubtarget::N32: return "abiN32";
case MipsSubtarget::N64: return "abi64";
case MipsSubtarget::EABI: return "eabi32"; default: break;
}
llvm_unreachable("Unknown Mips ABI");
return NULL;
}
void MipsAsmPrinter::EmitFunctionEntryLabel() {
OutStreamer.EmitRawText("\t.ent\t" + Twine(CurrentFnSym->getName()));
OutStreamer.EmitLabel(CurrentFnSym);
}
void MipsAsmPrinter::EmitFunctionBodyStart() {
emitFrameDirective();
SmallString<128> Str;
raw_svector_ostream OS(Str);
printSavedRegsBitmask(OS);
OutStreamer.EmitRawText(OS.str());
}
void MipsAsmPrinter::EmitFunctionBodyEnd() {
OutStreamer.EmitRawText(StringRef("\t.set\tmacro"));
OutStreamer.EmitRawText(StringRef("\t.set\treorder"));
OutStreamer.EmitRawText("\t.end\t" + Twine(CurrentFnSym->getName()));
}
bool MipsAsmPrinter::isBlockOnlyReachableByFallthrough(const MachineBasicBlock*
MBB) const {
const MachineBasicBlock *Pred = *MBB->pred_begin();
if (const BasicBlock *bb = Pred->getBasicBlock())
if (isa<SwitchInst>(bb->getTerminator()))
return false;
if (MBB->isLandingPad() || MBB->pred_empty())
return false;
MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(), PI2 = PI;
++PI2;
if (PI2 != MBB->pred_end())
return false;
if (!Pred->isLayoutSuccessor(MBB))
return false;
if (Pred->empty())
return true;
MachineBasicBlock::const_iterator I = Pred->end();
while (I != Pred->begin() && !(--I)->getDesc().isTerminator()) ;
return !I->getDesc().isBarrier();
}
bool MipsAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant,const char *ExtraCode,
raw_ostream &O) {
if (ExtraCode && ExtraCode[0])
return true;
printOperand(MI, OpNo, O);
return false;
}
bool MipsAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
unsigned OpNum, unsigned AsmVariant,
const char *ExtraCode,
raw_ostream &O) {
if (ExtraCode && ExtraCode[0])
return true;
const MachineOperand &MO = MI->getOperand(OpNum);
assert(MO.isReg() && "unexpected inline asm memory operand");
O << "0($" << MipsAsmPrinter::getRegisterName(MO.getReg()) << ")";
return false;
}
void MipsAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
raw_ostream &O) {
const MachineOperand &MO = MI->getOperand(opNum);
bool closeP = false;
if (MO.getTargetFlags())
closeP = true;
switch(MO.getTargetFlags()) {
case MipsII::MO_GPREL: O << "%gp_rel("; break;
case MipsII::MO_GOT_CALL: O << "%call16("; break;
case MipsII::MO_GOT: O << "%got("; break;
case MipsII::MO_ABS_HI: O << "%hi("; break;
case MipsII::MO_ABS_LO: O << "%lo("; break;
case MipsII::MO_TLSGD: O << "%tlsgd("; break;
case MipsII::MO_GOTTPREL: O << "%gottprel("; break;
case MipsII::MO_TPREL_HI: O << "%tprel_hi("; break;
case MipsII::MO_TPREL_LO: O << "%tprel_lo("; break;
}
switch (MO.getType()) {
case MachineOperand::MO_Register:
O << '$' << LowercaseString(getRegisterName(MO.getReg()));
break;
case MachineOperand::MO_Immediate:
O << MO.getImm();
break;
case MachineOperand::MO_MachineBasicBlock:
O << *MO.getMBB()->getSymbol();
return;
case MachineOperand::MO_GlobalAddress:
O << *Mang->getSymbol(MO.getGlobal());
break;
case MachineOperand::MO_BlockAddress: {
MCSymbol* BA = GetBlockAddressSymbol(MO.getBlockAddress());
O << BA->getName();
break;
}
case MachineOperand::MO_ExternalSymbol:
O << *GetExternalSymbolSymbol(MO.getSymbolName());
break;
case MachineOperand::MO_JumpTableIndex:
O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
<< '_' << MO.getIndex();
break;
case MachineOperand::MO_ConstantPoolIndex:
O << MAI->getPrivateGlobalPrefix() << "CPI"
<< getFunctionNumber() << "_" << MO.getIndex();
if (MO.getOffset())
O << "+" << MO.getOffset();
break;
default:
llvm_unreachable("<unknown operand type>");
}
if (closeP) O << ")";
}
void MipsAsmPrinter::printUnsignedImm(const MachineInstr *MI, int opNum,
raw_ostream &O) {
const MachineOperand &MO = MI->getOperand(opNum);
if (MO.isImm())
O << (unsigned short int)MO.getImm();
else
printOperand(MI, opNum, O);
}
void MipsAsmPrinter::
printMemOperand(const MachineInstr *MI, int opNum, raw_ostream &O,
const char *Modifier) {
if (Modifier && !strcmp(Modifier, "stackloc")) {
printOperand(MI, opNum+1, O);
O << ", ";
printOperand(MI, opNum, O);
return;
}
printOperand(MI, opNum, O);
O << "(";
printOperand(MI, opNum+1, O);
O << ")";
}
void MipsAsmPrinter::
printFCCOperand(const MachineInstr *MI, int opNum, raw_ostream &O,
const char *Modifier) {
const MachineOperand& MO = MI->getOperand(opNum);
O << Mips::MipsFCCToString((Mips::CondCode)MO.getImm());
}
void MipsAsmPrinter::EmitStartOfAsmFile(Module &M) {
OutStreamer.EmitRawText("\t.section .mdebug." + Twine(getCurrentABIString()));
if (Subtarget->isABI_EABI()) {
if (Subtarget->isGP32bit())
OutStreamer.EmitRawText(StringRef("\t.section .gcc_compiled_long32"));
else
OutStreamer.EmitRawText(StringRef("\t.section .gcc_compiled_long64"));
}
OutStreamer.EmitRawText(StringRef("\t.previous"));
}
MachineLocation
MipsAsmPrinter::getDebugValueLocation(const MachineInstr *MI) const {
assert(MI->getNumOperands() == 4 && "Invalid no. of machine operands!");
assert(MI->getOperand(0).isReg() && MI->getOperand(1).isImm() &&
"Unexpected MachineOperand types");
return MachineLocation(MI->getOperand(0).getReg(),
MI->getOperand(1).getImm());
}
void MipsAsmPrinter::PrintDebugValueComment(const MachineInstr *MI,
raw_ostream &OS) {
}
extern "C" void LLVMInitializeMipsAsmPrinter() {
RegisterAsmPrinter<MipsAsmPrinter> X(TheMipsTarget);
RegisterAsmPrinter<MipsAsmPrinter> Y(TheMipselTarget);
}