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Add a few more encodings, we can now encode all of:
pushl %ebp movl %esp, %ebp movl $42, %eax popl %ebp ret git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95344 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -249,7 +249,7 @@ void Emitter<CodeEmitter>::emitJumpTableAddress(unsigned JTI, unsigned Reloc,
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template<class CodeEmitter>
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unsigned Emitter<CodeEmitter>::getX86RegNum(unsigned RegNo) const {
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return II->getRegisterInfo().getX86RegNum(RegNo);
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return X86RegisterInfo::getX86RegNum(RegNo);
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}
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inline static unsigned char ModRMByte(unsigned Mod, unsigned RegOpcode,
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@ -32,10 +32,34 @@ public:
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~X86MCCodeEmitter() {}
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static unsigned GetX86RegNum(const MCOperand &MO) {
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return X86RegisterInfo::getX86RegNum(MO.getReg());
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}
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void EmitByte(unsigned char C, raw_ostream &OS) const {
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OS << (char)C;
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}
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void EmitConstant(uint64_t Val, unsigned Size, raw_ostream &OS) const {
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// Output the constant in little endian byte order.
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for (unsigned i = 0; i != Size; ++i) {
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EmitByte(Val & 255, OS);
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Val >>= 8;
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}
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}
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inline static unsigned char ModRMByte(unsigned Mod, unsigned RegOpcode,
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unsigned RM) {
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assert(Mod < 4 && RegOpcode < 8 && RM < 8 && "ModRM Fields out of range!");
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return RM | (RegOpcode << 3) | (Mod << 6);
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}
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void EmitRegModRMByte(const MCOperand &ModRMReg, unsigned RegOpcodeFld,
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raw_ostream &OS) const {
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EmitByte(ModRMByte(3, RegOpcodeFld, GetX86RegNum(ModRMReg)), OS);
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}
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void EncodeInstruction(const MCInst &MI, raw_ostream &OS) const;
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};
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@ -160,42 +184,43 @@ EncodeInstruction(const MCInst &MI, raw_ostream &OS) const {
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if (CurOp == NumOps)
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break;
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assert(0 && "Unimpl");
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#if 0
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const MachineOperand &MO = MI.getOperand(CurOp++);
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DEBUG(dbgs() << "RawFrm CurOp " << CurOp << "\n");
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DEBUG(dbgs() << "isMBB " << MO.isMBB() << "\n");
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DEBUG(dbgs() << "isGlobal " << MO.isGlobal() << "\n");
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DEBUG(dbgs() << "isSymbol " << MO.isSymbol() << "\n");
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DEBUG(dbgs() << "isImm " << MO.isImm() << "\n");
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if (MO.isMBB()) {
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emitPCRelativeBlockAddress(MO.getMBB());
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break;
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}
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if (MO.isGlobal()) {
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emitGlobalAddress(MO.getGlobal(), X86::reloc_pcrel_word,
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MO.getOffset(), 0);
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break;
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}
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if (MO.isSymbol()) {
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emitExternalSymbolAddress(MO.getSymbolName(), X86::reloc_pcrel_word);
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break;
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}
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assert(MO.isImm() && "Unknown RawFrm operand!");
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if (Opcode == X86::CALLpcrel32 || Opcode == X86::CALL64pcrel32) {
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// Fix up immediate operand for pc relative calls.
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intptr_t Imm = (intptr_t)MO.getImm();
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Imm = Imm - MCE.getCurrentPCValue() - 4;
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emitConstant(Imm, X86InstrInfo::sizeOfImm(Desc));
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} else
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emitConstant(MO.getImm(), X86InstrInfo::sizeOfImm(Desc));
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assert(0 && "Unimpl RawFrm expr");
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break;
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#endif
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}
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case X86II::AddRegFrm: {
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EmitByte(BaseOpcode + GetX86RegNum(MI.getOperand(CurOp++)),OS);
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if (CurOp == NumOps)
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break;
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const MCOperand &MO1 = MI.getOperand(CurOp++);
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if (MO1.isImm()) {
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unsigned Size = X86InstrInfo::sizeOfImm(&Desc);
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EmitConstant(MO1.getImm(), Size, OS);
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break;
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}
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assert(0 && "Unimpl AddRegFrm expr");
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break;
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}
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case X86II::MRMDestReg:
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EmitByte(BaseOpcode, OS);
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EmitRegModRMByte(MI.getOperand(CurOp),
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GetX86RegNum(MI.getOperand(CurOp+1)), OS);
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CurOp += 2;
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if (CurOp != NumOps)
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EmitConstant(MI.getOperand(CurOp++).getImm(),
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X86InstrInfo::sizeOfImm(&Desc), OS);
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break;
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}
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#ifndef NDEBUG
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if (!Desc.isVariadic() && CurOp != NumOps) {
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errs() << "Cannot encode all operands of: ";
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MI.dump();
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errs() << '\n';
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abort();
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}
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#endif
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}
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