ArgUnion getImm(PC const origPC, int idx, const Unit* unit) {
auto pc = origPC;
auto const UNUSED op = decode_op(pc);
assert(idx >= 0 && idx < numImmediates(op));
ArgUnion retval;
retval.u_NA = 0;
int cursor = 0;
for (cursor = 0; cursor < idx; cursor++) {
// Advance over this immediate.
pc += immSize(origPC, cursor);
}
always_assert(cursor == idx);
auto const type = immType(op, idx);
if (type == IVA || type == LA || type == IA) {
retval.u_IVA = decodeVariableSizeImm(&pc);
} else if (type == KA) {
assert(unit != nullptr);
retval.u_KA = decode_member_key(pc, unit);
} else if (!immIsVector(op, cursor)) {
always_assert(type != RATA); // Decode RATAs with a different function.
memcpy(&retval.bytes, pc, immSize(origPC, idx));
}
always_assert(numImmediates(op) > idx);
return retval;
}
ArgUnion getImm(const PC origPC, int idx, const Unit* unit) {
auto pc = origPC;
auto const op = decode_op(pc);
assertx(idx >= 0 && idx < numImmediates(op));
ArgUnion retval;
retval.u_NA = 0;
int cursor = 0;
for (cursor = 0; cursor < idx; cursor++) {
// Advance over this immediate.
pc += immSize(immType(op, cursor), pc);
}
always_assert(cursor == idx);
auto const type = immType(op, idx);
if (type == IVA || type == LA || type == IA ||
type == CAR || type == CAW) {
retval.u_IVA = decode_iva(pc);
} else if (type == KA) {
assertx(unit != nullptr);
retval.u_KA = decode_member_key(pc, unit);
} else if (type == LAR) {
retval.u_LAR = decodeLocalRange(pc);
} else if (type == FCA) {
retval.u_FCA = decodeFCallArgs(pc);
} else if (type == RATA) {
assertx(unit != nullptr);
retval.u_RATA = decodeRAT(unit, pc);
} else if (!argTypeIsVector(type)) {
memcpy(&retval.bytes, pc, immSize(type, pc));
}
always_assert(numImmediates(op) > idx);
return retval;
}
