#ifndef DCPU16_H_3XXIQQG2
#define DCPU16_H_3XXIQQG2

/* the target system's concept of a word */
typedef unsigned short DCPU16_WORD;

/* how much ram the system has */
#define DCPU16_RAM 0x10000

/* a self-contained dcpu16 core */
struct dcpu16 {
    unsigned long long cycle;   /* number of cycles this core has executed */
    DCPU16_WORD reg[8];         /* system registers, a b c x y z i j */
    DCPU16_WORD pc;             /* program counter */
    DCPU16_WORD sp;             /* stack pointer */
    DCPU16_WORD o;              /* overflow */
    unsigned int skip_ : 1;     /* skip execution of next instruction */
    DCPU16_WORD ram[DCPU16_RAM];  /* memory */
    DCPU16_WORD reg_work_[2];   /* (private) work registers for holding literal values while decoding instructions */
};

/* instantiate a new core */
struct dcpu16 *dcpu16_new(void);

/* print the current state of a core */
void dcpu16_state_print(struct dcpu16 *);

/* print the contents of ram from second to third argument */
void dcpu16_dump_ram(struct dcpu16 *, DCPU16_WORD, DCPU16_WORD);

/* print the instruction at the specified address */
void dcpu16_disassemble_print(struct dcpu16 *, DCPU16_WORD);


/* execute the next instruction */
void dcpu16_step(struct dcpu16 *);

/* release a core */
void dcpu16_delete(struct dcpu16 **);

/* register callbacks to handle warning and debug messages, defaults to writing to stderr */
void dcpu16_warn_cb_set(void (*)(char *, ...));
void dcpu16_trace_cb_set(void (*)(char *, ...));

#endif /* DCPU16_H_3XXIQQG2 */