import type { MachineInterface } from '../core/types.js';
/** Argument type discriminator */
export type ArgType = 'u8' | 'u16';
/** Return type discriminator */
export type RetType = 'void' | 'u8' | 'u16';
/**
 * A typed argument value.
 * Bare numbers are treated as u8. Use { type: 'u16', value } for 16-bit values.
 */
export type ArgValue = number | {
    type: 'u8';
    value: number;
} | {
    type: 'u16';
    value: number;
};
/** Calling convention port — knows how to pass args and read return values */
export interface CallingConvention {
    /** Place arguments into registers and/or stack before the call */
    placeArgs(m: MachineInterface, args: ArgValue[]): void;
    /** Read the return value from registers after the call */
    readReturn(m: MachineInterface, ret: RetType): number;
}
/** Resolve an ArgValue to its type and numeric value */
export declare function resolveArg(arg: ArgValue): {
    type: ArgType;
    value: number;
};
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