void WebAssemblyMCCodeEmitter::encodeInstruction( const MCInst &MI, raw_ostream &OS, SmallVectorImpl<MCFixup> &Fixups, const MCSubtargetInfo &STI) const { // FIXME: This is not the real binary encoding. This is an extremely // over-simplified encoding where we just use uint64_t for everything. This // is a temporary measure. support::endian::Writer<support::little>(OS).write<uint64_t>(MI.getOpcode()); const MCInstrDesc &Desc = MCII.get(MI.getOpcode()); if (Desc.isVariadic()) support::endian::Writer<support::little>(OS).write<uint64_t>( MI.getNumOperands() - Desc.NumOperands); for (unsigned i = 0, e = MI.getNumOperands(); i < e; ++i) { const MCOperand &MO = MI.getOperand(i); if (MO.isReg()) { support::endian::Writer<support::little>(OS).write<uint64_t>(MO.getReg()); } else if (MO.isImm()) { support::endian::Writer<support::little>(OS).write<uint64_t>(MO.getImm()); } else if (MO.isFPImm()) { support::endian::Writer<support::little>(OS).write<double>(MO.getFPImm()); } else if (MO.isExpr()) { support::endian::Writer<support::little>(OS).write<uint64_t>(0); Fixups.push_back(MCFixup::create( (1 + MCII.get(MI.getOpcode()).isVariadic() + i) * sizeof(uint64_t), MO.getExpr(), STI.getTargetTriple().isArch64Bit() ? FK_Data_8 : FK_Data_4, MI.getLoc())); ++MCNumFixups; } else { llvm_unreachable("unexpected operand kind"); } } ++MCNumEmitted; // Keep track of the # of mi's emitted. }