X86CodeEmitter.cpp [plain text]
#define DEBUG_TYPE "x86-emitter"
#include "X86InstrInfo.h"
#include "X86JITInfo.h"
#include "X86Subtarget.h"
#include "X86TargetMachine.h"
#include "X86Relocations.h"
#include "X86.h"
#include "llvm/PassManager.h"
#include "llvm/CodeGen/MachineCodeEmitter.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/Function.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
#include "llvm/Target/TargetOptions.h"
using namespace llvm;
STATISTIC(NumEmitted, "Number of machine instructions emitted");
namespace {
class VISIBILITY_HIDDEN Emitter : public MachineFunctionPass {
const X86InstrInfo *II;
const TargetData *TD;
X86TargetMachine &TM;
MachineCodeEmitter &MCE;
intptr_t PICBaseOffset;
bool Is64BitMode;
bool IsPIC;
public:
static char ID;
explicit Emitter(X86TargetMachine &tm, MachineCodeEmitter &mce)
: MachineFunctionPass(&ID), II(0), TD(0), TM(tm),
MCE(mce), PICBaseOffset(0), Is64BitMode(false),
IsPIC(TM.getRelocationModel() == Reloc::PIC_) {}
Emitter(X86TargetMachine &tm, MachineCodeEmitter &mce,
const X86InstrInfo &ii, const TargetData &td, bool is64)
: MachineFunctionPass(&ID), II(&ii), TD(&td), TM(tm),
MCE(mce), PICBaseOffset(0), Is64BitMode(is64),
IsPIC(TM.getRelocationModel() == Reloc::PIC_) {}
bool runOnMachineFunction(MachineFunction &MF);
virtual const char *getPassName() const {
return "X86 Machine Code Emitter";
}
void emitInstruction(const MachineInstr &MI,
const TargetInstrDesc *Desc);
void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<MachineModuleInfo>();
MachineFunctionPass::getAnalysisUsage(AU);
}
private:
void emitPCRelativeBlockAddress(MachineBasicBlock *MBB);
void emitGlobalAddress(GlobalValue *GV, unsigned Reloc,
intptr_t Disp = 0, intptr_t PCAdj = 0,
bool NeedStub = false, bool Indirect = false);
void emitExternalSymbolAddress(const char *ES, unsigned Reloc);
void emitConstPoolAddress(unsigned CPI, unsigned Reloc, intptr_t Disp = 0,
intptr_t PCAdj = 0);
void emitJumpTableAddress(unsigned JTI, unsigned Reloc,
intptr_t PCAdj = 0);
void emitDisplacementField(const MachineOperand *RelocOp, int DispVal,
intptr_t PCAdj = 0);
void emitRegModRMByte(unsigned ModRMReg, unsigned RegOpcodeField);
void emitRegModRMByte(unsigned RegOpcodeField);
void emitSIBByte(unsigned SS, unsigned Index, unsigned Base);
void emitConstant(uint64_t Val, unsigned Size);
void emitMemModRMByte(const MachineInstr &MI,
unsigned Op, unsigned RegOpcodeField,
intptr_t PCAdj = 0);
unsigned getX86RegNum(unsigned RegNo) const;
bool gvNeedsNonLazyPtr(const GlobalValue *GV);
};
char Emitter::ID = 0;
}
FunctionPass *llvm::createX86CodeEmitterPass(X86TargetMachine &TM,
MachineCodeEmitter &MCE) {
return new Emitter(TM, MCE);
}
bool Emitter::runOnMachineFunction(MachineFunction &MF) {
MCE.setModuleInfo(&getAnalysis<MachineModuleInfo>());
II = TM.getInstrInfo();
TD = TM.getTargetData();
Is64BitMode = TM.getSubtarget<X86Subtarget>().is64Bit();
IsPIC = TM.getRelocationModel() == Reloc::PIC_;
do {
DOUT << "JITTing function '" << MF.getFunction()->getName() << "'\n";
MCE.startFunction(MF);
for (MachineFunction::iterator MBB = MF.begin(), E = MF.end();
MBB != E; ++MBB) {
MCE.StartMachineBasicBlock(MBB);
for (MachineBasicBlock::const_iterator I = MBB->begin(), E = MBB->end();
I != E; ++I) {
const TargetInstrDesc &Desc = I->getDesc();
emitInstruction(*I, &Desc);
if (Desc.getOpcode() == X86::MOVPC32r)
emitInstruction(*I, &II->get(X86::POP32r));
NumEmitted++; }
}
} while (MCE.finishFunction(MF));
return false;
}
void Emitter::emitPCRelativeBlockAddress(MachineBasicBlock *MBB) {
MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
X86::reloc_pcrel_word, MBB));
MCE.emitWordLE(0);
}
void Emitter::emitGlobalAddress(GlobalValue *GV, unsigned Reloc,
intptr_t Disp ,
intptr_t PCAdj ,
bool NeedStub ,
bool Indirect ) {
intptr_t RelocCST = 0;
if (Reloc == X86::reloc_picrel_word)
RelocCST = PICBaseOffset;
else if (Reloc == X86::reloc_pcrel_word)
RelocCST = PCAdj;
MachineRelocation MR = Indirect
? MachineRelocation::getIndirectSymbol(MCE.getCurrentPCOffset(), Reloc,
GV, RelocCST, NeedStub)
: MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
GV, RelocCST, NeedStub);
MCE.addRelocation(MR);
if (Reloc == X86::reloc_absolute_dword)
MCE.emitDWordLE(Disp);
else
MCE.emitWordLE((int32_t)Disp);
}
void Emitter::emitExternalSymbolAddress(const char *ES, unsigned Reloc) {
intptr_t RelocCST = (Reloc == X86::reloc_picrel_word) ? PICBaseOffset : 0;
MCE.addRelocation(MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
Reloc, ES, RelocCST));
if (Reloc == X86::reloc_absolute_dword)
MCE.emitDWordLE(0);
else
MCE.emitWordLE(0);
}
void Emitter::emitConstPoolAddress(unsigned CPI, unsigned Reloc,
intptr_t Disp ,
intptr_t PCAdj ) {
intptr_t RelocCST = 0;
if (Reloc == X86::reloc_picrel_word)
RelocCST = PICBaseOffset;
else if (Reloc == X86::reloc_pcrel_word)
RelocCST = PCAdj;
MCE.addRelocation(MachineRelocation::getConstPool(MCE.getCurrentPCOffset(),
Reloc, CPI, RelocCST));
if (Reloc == X86::reloc_absolute_dword)
MCE.emitDWordLE(Disp);
else
MCE.emitWordLE((int32_t)Disp);
}
void Emitter::emitJumpTableAddress(unsigned JTI, unsigned Reloc,
intptr_t PCAdj ) {
intptr_t RelocCST = 0;
if (Reloc == X86::reloc_picrel_word)
RelocCST = PICBaseOffset;
else if (Reloc == X86::reloc_pcrel_word)
RelocCST = PCAdj;
MCE.addRelocation(MachineRelocation::getJumpTable(MCE.getCurrentPCOffset(),
Reloc, JTI, RelocCST));
if (Reloc == X86::reloc_absolute_dword)
MCE.emitDWordLE(0);
else
MCE.emitWordLE(0);
}
unsigned Emitter::getX86RegNum(unsigned RegNo) const {
return II->getRegisterInfo().getX86RegNum(RegNo);
}
inline static unsigned char ModRMByte(unsigned Mod, unsigned RegOpcode,
unsigned RM) {
assert(Mod < 4 && RegOpcode < 8 && RM < 8 && "ModRM Fields out of range!");
return RM | (RegOpcode << 3) | (Mod << 6);
}
void Emitter::emitRegModRMByte(unsigned ModRMReg, unsigned RegOpcodeFld){
MCE.emitByte(ModRMByte(3, RegOpcodeFld, getX86RegNum(ModRMReg)));
}
void Emitter::emitRegModRMByte(unsigned RegOpcodeFld) {
MCE.emitByte(ModRMByte(3, RegOpcodeFld, 0));
}
void Emitter::emitSIBByte(unsigned SS, unsigned Index, unsigned Base) {
MCE.emitByte(ModRMByte(SS, Index, Base));
}
void Emitter::emitConstant(uint64_t Val, unsigned Size) {
for (unsigned i = 0; i != Size; ++i) {
MCE.emitByte(Val & 255);
Val >>= 8;
}
}
static bool isDisp8(int Value) {
return Value == (signed char)Value;
}
bool Emitter::gvNeedsNonLazyPtr(const GlobalValue *GV) {
return (!Is64BitMode || TM.getSubtarget<X86Subtarget>().isTargetDarwin()) &&
TM.getSubtarget<X86Subtarget>().GVRequiresExtraLoad(GV, TM, false);
}
void Emitter::emitDisplacementField(const MachineOperand *RelocOp,
int DispVal, intptr_t PCAdj) {
if (!RelocOp) {
emitConstant(DispVal, 4);
return;
}
if (RelocOp->isGlobal()) {
unsigned rt = Is64BitMode ? X86::reloc_pcrel_word
: (IsPIC ? X86::reloc_picrel_word : X86::reloc_absolute_word);
bool NeedStub = isa<Function>(RelocOp->getGlobal());
bool Indirect = gvNeedsNonLazyPtr(RelocOp->getGlobal());
emitGlobalAddress(RelocOp->getGlobal(), rt, RelocOp->getOffset(),
PCAdj, NeedStub, Indirect);
} else if (RelocOp->isCPI()) {
unsigned rt = Is64BitMode ? X86::reloc_pcrel_word : X86::reloc_picrel_word;
emitConstPoolAddress(RelocOp->getIndex(), rt,
RelocOp->getOffset(), PCAdj);
} else if (RelocOp->isJTI()) {
unsigned rt = Is64BitMode ? X86::reloc_pcrel_word : X86::reloc_picrel_word;
emitJumpTableAddress(RelocOp->getIndex(), rt, PCAdj);
} else {
assert(0 && "Unknown value to relocate!");
}
}
void Emitter::emitMemModRMByte(const MachineInstr &MI,
unsigned Op, unsigned RegOpcodeField,
intptr_t PCAdj) {
const MachineOperand &Op3 = MI.getOperand(Op+3);
int DispVal = 0;
const MachineOperand *DispForReloc = 0;
if (Op3.isGlobal()) {
DispForReloc = &Op3;
} else if (Op3.isCPI()) {
if (Is64BitMode || IsPIC) {
DispForReloc = &Op3;
} else {
DispVal += MCE.getConstantPoolEntryAddress(Op3.getIndex());
DispVal += Op3.getOffset();
}
} else if (Op3.isJTI()) {
if (Is64BitMode || IsPIC) {
DispForReloc = &Op3;
} else {
DispVal += MCE.getJumpTableEntryAddress(Op3.getIndex());
}
} else {
DispVal = Op3.getImm();
}
const MachineOperand &Base = MI.getOperand(Op);
const MachineOperand &Scale = MI.getOperand(Op+1);
const MachineOperand &IndexReg = MI.getOperand(Op+2);
unsigned BaseReg = Base.getReg();
if ((!Is64BitMode || DispForReloc) && IndexReg.getReg() == 0 &&
(BaseReg == 0 || getX86RegNum(BaseReg) != N86::ESP)) {
if (BaseReg == 0) { MCE.emitByte(ModRMByte(0, RegOpcodeField, 5));
emitDisplacementField(DispForReloc, DispVal, PCAdj);
} else {
unsigned BaseRegNo = getX86RegNum(BaseReg);
if (!DispForReloc && DispVal == 0 && BaseRegNo != N86::EBP) {
MCE.emitByte(ModRMByte(0, RegOpcodeField, BaseRegNo));
} else if (!DispForReloc && isDisp8(DispVal)) {
MCE.emitByte(ModRMByte(1, RegOpcodeField, BaseRegNo));
emitConstant(DispVal, 1);
} else {
MCE.emitByte(ModRMByte(2, RegOpcodeField, BaseRegNo));
emitDisplacementField(DispForReloc, DispVal, PCAdj);
}
}
} else { assert(IndexReg.getReg() != X86::ESP &&
IndexReg.getReg() != X86::RSP && "Cannot use ESP as index reg!");
bool ForceDisp32 = false;
bool ForceDisp8 = false;
if (BaseReg == 0) {
MCE.emitByte(ModRMByte(0, RegOpcodeField, 4));
ForceDisp32 = true;
} else if (DispForReloc) {
MCE.emitByte(ModRMByte(2, RegOpcodeField, 4));
ForceDisp32 = true;
} else if (DispVal == 0 && getX86RegNum(BaseReg) != N86::EBP) {
MCE.emitByte(ModRMByte(0, RegOpcodeField, 4));
} else if (isDisp8(DispVal)) {
MCE.emitByte(ModRMByte(1, RegOpcodeField, 4));
ForceDisp8 = true; } else {
MCE.emitByte(ModRMByte(2, RegOpcodeField, 4));
}
static const unsigned SSTable[] = { ~0, 0, 1, ~0, 2, ~0, ~0, ~0, 3 };
unsigned SS = SSTable[Scale.getImm()];
if (BaseReg == 0) {
unsigned IndexRegNo;
if (IndexReg.getReg())
IndexRegNo = getX86RegNum(IndexReg.getReg());
else
IndexRegNo = 4; emitSIBByte(SS, IndexRegNo, 5);
} else {
unsigned BaseRegNo = getX86RegNum(BaseReg);
unsigned IndexRegNo;
if (IndexReg.getReg())
IndexRegNo = getX86RegNum(IndexReg.getReg());
else
IndexRegNo = 4; emitSIBByte(SS, IndexRegNo, BaseRegNo);
}
if (ForceDisp8) {
emitConstant(DispVal, 1);
} else if (DispVal != 0 || ForceDisp32) {
emitDisplacementField(DispForReloc, DispVal, PCAdj);
}
}
}
void Emitter::emitInstruction(const MachineInstr &MI,
const TargetInstrDesc *Desc) {
DOUT << MI;
unsigned Opcode = Desc->Opcode;
if (Desc->TSFlags & X86II::LOCK) MCE.emitByte(0xF0);
switch (Desc->TSFlags & X86II::SegOvrMask) {
case X86II::FS:
MCE.emitByte(0x64);
break;
case X86II::GS:
MCE.emitByte(0x65);
break;
default: assert(0 && "Invalid segment!");
case 0: break; }
if ((Desc->TSFlags & X86II::Op0Mask) == X86II::REP) MCE.emitByte(0xF3);
if (Desc->TSFlags & X86II::OpSize) MCE.emitByte(0x66);
if (Desc->TSFlags & X86II::AdSize) MCE.emitByte(0x67);
bool Need0FPrefix = false;
switch (Desc->TSFlags & X86II::Op0Mask) {
case X86II::TB: case X86II::T8: case X86II::TA: Need0FPrefix = true;
break;
case X86II::REP: break; case X86II::XS: MCE.emitByte(0xF3);
Need0FPrefix = true;
break;
case X86II::XD: MCE.emitByte(0xF2);
Need0FPrefix = true;
break;
case X86II::D8: case X86II::D9: case X86II::DA: case X86II::DB:
case X86II::DC: case X86II::DD: case X86II::DE: case X86II::DF:
MCE.emitByte(0xD8+
(((Desc->TSFlags & X86II::Op0Mask)-X86II::D8)
>> X86II::Op0Shift));
break; default: assert(0 && "Invalid prefix!");
case 0: break; }
if (Is64BitMode) {
unsigned REX = X86InstrInfo::determineREX(MI);
if (REX)
MCE.emitByte(0x40 | REX);
}
if (Need0FPrefix)
MCE.emitByte(0x0F);
switch (Desc->TSFlags & X86II::Op0Mask) {
case X86II::T8: MCE.emitByte(0x38);
break;
case X86II::TA: MCE.emitByte(0x3A);
break;
}
unsigned NumOps = Desc->getNumOperands();
unsigned CurOp = 0;
if (NumOps > 1 && Desc->getOperandConstraint(1, TOI::TIED_TO) != -1)
++CurOp;
else if (NumOps > 2 && Desc->getOperandConstraint(NumOps-1, TOI::TIED_TO)== 0)
--NumOps;
unsigned char BaseOpcode = II->getBaseOpcodeFor(Desc);
switch (Desc->TSFlags & X86II::FormMask) {
default: assert(0 && "Unknown FormMask value in X86 MachineCodeEmitter!");
case X86II::Pseudo:
switch (Opcode) {
default:
assert(0 && "psuedo instructions should be removed before code emission");
break;
case TargetInstrInfo::INLINEASM: {
if (MI.getOperand(0).getSymbolName()[0]) {
assert(0 && "JIT does not support inline asm!\n");
abort();
}
break;
}
case TargetInstrInfo::DBG_LABEL:
case TargetInstrInfo::EH_LABEL:
MCE.emitLabel(MI.getOperand(0).getImm());
break;
case TargetInstrInfo::IMPLICIT_DEF:
case TargetInstrInfo::DECLARE:
case X86::DWARF_LOC:
case X86::FP_REG_KILL:
break;
case X86::MOVPC32r: {
MCE.emitByte(BaseOpcode);
emitConstant(0, X86InstrInfo::sizeOfImm(Desc));
PICBaseOffset = (intptr_t) MCE.getCurrentPCOffset();
X86JITInfo *JTI = TM.getJITInfo();
JTI->setPICBase(MCE.getCurrentPCValue());
break;
}
}
CurOp = NumOps;
break;
case X86II::RawFrm:
MCE.emitByte(BaseOpcode);
if (CurOp != NumOps) {
const MachineOperand &MO = MI.getOperand(CurOp++);
DOUT << "RawFrm CurOp " << CurOp << "\n";
DOUT << "isMBB " << MO.isMBB() << "\n";
DOUT << "isGlobal " << MO.isGlobal() << "\n";
DOUT << "isSymbol " << MO.isSymbol() << "\n";
DOUT << "isImm " << MO.isImm() << "\n";
if (MO.isMBB()) {
emitPCRelativeBlockAddress(MO.getMBB());
} else if (MO.isGlobal()) {
bool NeedStub =
(Is64BitMode &&
(TM.getCodeModel() == CodeModel::Large ||
TM.getSubtarget<X86Subtarget>().isTargetDarwin())) ||
Opcode == X86::TAILJMPd;
emitGlobalAddress(MO.getGlobal(), X86::reloc_pcrel_word,
MO.getOffset(), 0, NeedStub);
} else if (MO.isSymbol()) {
emitExternalSymbolAddress(MO.getSymbolName(), X86::reloc_pcrel_word);
} else if (MO.isImm()) {
if (Opcode == X86::CALLpcrel32 || Opcode == X86::CALL64pcrel32) {
intptr_t Imm = (intptr_t)MO.getImm();
Imm = Imm - MCE.getCurrentPCValue() - 4;
emitConstant(Imm, X86InstrInfo::sizeOfImm(Desc));
} else
emitConstant(MO.getImm(), X86InstrInfo::sizeOfImm(Desc));
} else {
assert(0 && "Unknown RawFrm operand!");
}
}
break;
case X86II::AddRegFrm:
MCE.emitByte(BaseOpcode + getX86RegNum(MI.getOperand(CurOp++).getReg()));
if (CurOp != NumOps) {
const MachineOperand &MO1 = MI.getOperand(CurOp++);
unsigned Size = X86InstrInfo::sizeOfImm(Desc);
if (MO1.isImm())
emitConstant(MO1.getImm(), Size);
else {
unsigned rt = Is64BitMode ? X86::reloc_pcrel_word
: (IsPIC ? X86::reloc_picrel_word : X86::reloc_absolute_word);
if (Opcode == X86::MOV64ri)
rt = X86::reloc_absolute_dword; if (MO1.isGlobal()) {
bool NeedStub = isa<Function>(MO1.getGlobal());
bool Indirect = gvNeedsNonLazyPtr(MO1.getGlobal());
emitGlobalAddress(MO1.getGlobal(), rt, MO1.getOffset(), 0,
NeedStub, Indirect);
} else if (MO1.isSymbol())
emitExternalSymbolAddress(MO1.getSymbolName(), rt);
else if (MO1.isCPI())
emitConstPoolAddress(MO1.getIndex(), rt);
else if (MO1.isJTI())
emitJumpTableAddress(MO1.getIndex(), rt);
}
}
break;
case X86II::MRMDestReg: {
MCE.emitByte(BaseOpcode);
emitRegModRMByte(MI.getOperand(CurOp).getReg(),
getX86RegNum(MI.getOperand(CurOp+1).getReg()));
CurOp += 2;
if (CurOp != NumOps)
emitConstant(MI.getOperand(CurOp++).getImm(), X86InstrInfo::sizeOfImm(Desc));
break;
}
case X86II::MRMDestMem: {
MCE.emitByte(BaseOpcode);
emitMemModRMByte(MI, CurOp,
getX86RegNum(MI.getOperand(CurOp + X86AddrNumOperands)
.getReg()));
CurOp += X86AddrNumOperands + 1;
if (CurOp != NumOps)
emitConstant(MI.getOperand(CurOp++).getImm(), X86InstrInfo::sizeOfImm(Desc));
break;
}
case X86II::MRMSrcReg:
MCE.emitByte(BaseOpcode);
emitRegModRMByte(MI.getOperand(CurOp+1).getReg(),
getX86RegNum(MI.getOperand(CurOp).getReg()));
CurOp += 2;
if (CurOp != NumOps)
emitConstant(MI.getOperand(CurOp++).getImm(), X86InstrInfo::sizeOfImm(Desc));
break;
case X86II::MRMSrcMem: {
int AddrOperands;
if (Opcode == X86::LEA64r || Opcode == X86::LEA64_32r ||
Opcode == X86::LEA16r || Opcode == X86::LEA32r)
AddrOperands = X86AddrNumOperands - 1; else
AddrOperands = X86AddrNumOperands;
intptr_t PCAdj = (CurOp + AddrOperands + 1 != NumOps) ?
X86InstrInfo::sizeOfImm(Desc) : 0;
MCE.emitByte(BaseOpcode);
emitMemModRMByte(MI, CurOp+1, getX86RegNum(MI.getOperand(CurOp).getReg()),
PCAdj);
CurOp += AddrOperands + 1;
if (CurOp != NumOps)
emitConstant(MI.getOperand(CurOp++).getImm(), X86InstrInfo::sizeOfImm(Desc));
break;
}
case X86II::MRM0r: case X86II::MRM1r:
case X86II::MRM2r: case X86II::MRM3r:
case X86II::MRM4r: case X86II::MRM5r:
case X86II::MRM6r: case X86II::MRM7r: {
MCE.emitByte(BaseOpcode);
if (Desc->getOpcode() == X86::LFENCE ||
Desc->getOpcode() == X86::MFENCE ||
Desc->getOpcode() == X86::MONITOR ||
Desc->getOpcode() == X86::MWAIT) {
emitRegModRMByte((Desc->TSFlags & X86II::FormMask)-X86II::MRM0r);
switch (Desc->getOpcode()) {
default: break;
case X86::MONITOR:
MCE.emitByte(0xC8);
break;
case X86::MWAIT:
MCE.emitByte(0xC9);
break;
}
} else {
emitRegModRMByte(MI.getOperand(CurOp++).getReg(),
(Desc->TSFlags & X86II::FormMask)-X86II::MRM0r);
}
if (CurOp != NumOps) {
const MachineOperand &MO1 = MI.getOperand(CurOp++);
unsigned Size = X86InstrInfo::sizeOfImm(Desc);
if (MO1.isImm())
emitConstant(MO1.getImm(), Size);
else {
unsigned rt = Is64BitMode ? X86::reloc_pcrel_word
: (IsPIC ? X86::reloc_picrel_word : X86::reloc_absolute_word);
if (Opcode == X86::MOV64ri32)
rt = X86::reloc_absolute_word; if (MO1.isGlobal()) {
bool NeedStub = isa<Function>(MO1.getGlobal());
bool Indirect = gvNeedsNonLazyPtr(MO1.getGlobal());
emitGlobalAddress(MO1.getGlobal(), rt, MO1.getOffset(), 0,
NeedStub, Indirect);
} else if (MO1.isSymbol())
emitExternalSymbolAddress(MO1.getSymbolName(), rt);
else if (MO1.isCPI())
emitConstPoolAddress(MO1.getIndex(), rt);
else if (MO1.isJTI())
emitJumpTableAddress(MO1.getIndex(), rt);
}
}
break;
}
case X86II::MRM0m: case X86II::MRM1m:
case X86II::MRM2m: case X86II::MRM3m:
case X86II::MRM4m: case X86II::MRM5m:
case X86II::MRM6m: case X86II::MRM7m: {
intptr_t PCAdj = (CurOp + X86AddrNumOperands != NumOps) ?
(MI.getOperand(CurOp+X86AddrNumOperands).isImm() ?
X86InstrInfo::sizeOfImm(Desc) : 4) : 0;
MCE.emitByte(BaseOpcode);
emitMemModRMByte(MI, CurOp, (Desc->TSFlags & X86II::FormMask)-X86II::MRM0m,
PCAdj);
CurOp += X86AddrNumOperands;
if (CurOp != NumOps) {
const MachineOperand &MO = MI.getOperand(CurOp++);
unsigned Size = X86InstrInfo::sizeOfImm(Desc);
if (MO.isImm())
emitConstant(MO.getImm(), Size);
else {
unsigned rt = Is64BitMode ? X86::reloc_pcrel_word
: (IsPIC ? X86::reloc_picrel_word : X86::reloc_absolute_word);
if (Opcode == X86::MOV64mi32)
rt = X86::reloc_absolute_word; if (MO.isGlobal()) {
bool NeedStub = isa<Function>(MO.getGlobal());
bool Indirect = gvNeedsNonLazyPtr(MO.getGlobal());
emitGlobalAddress(MO.getGlobal(), rt, MO.getOffset(), 0,
NeedStub, Indirect);
} else if (MO.isSymbol())
emitExternalSymbolAddress(MO.getSymbolName(), rt);
else if (MO.isCPI())
emitConstPoolAddress(MO.getIndex(), rt);
else if (MO.isJTI())
emitJumpTableAddress(MO.getIndex(), rt);
}
}
break;
}
case X86II::MRMInitReg:
MCE.emitByte(BaseOpcode);
emitRegModRMByte(MI.getOperand(CurOp).getReg(),
getX86RegNum(MI.getOperand(CurOp).getReg()));
++CurOp;
break;
}
if (!Desc->isVariadic() && CurOp != NumOps) {
cerr << "Cannot encode: ";
MI.dump();
cerr << '\n';
abort();
}
}