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.
}
