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#ifndef DEF_SIM_H
#define DEF_SIM_H
#include <stdio.h>
// Gate types
#define C_COPY 0
#define C_NOT 1
#define C_BINOP 2
#define C_MUX 3
#define C_ROM 4
#define C_CONCAT 5
#define C_SLICE 6
#define C_SELECT 7
#define C_READRAM 8
// Binary operators
#define OP_OR 0
#define OP_XOR 1
#define OP_AND 2
#define OP_NAND 3
// Data structures
// Use 64-bit ints as bit arrays. Bit index 0 is bitmask 1, bit index 1 is bitmask 2, etc.
typedef unsigned long long int t_value;
typedef struct _s_rom {
int word_size, words_defined;
t_value *data;
const char *prefix;
struct _s_rom *next;
} t_rom;
// Identifier for the variables of the circuit.
typedef int t_id;
typedef struct { // a variable in the simulator
t_value mask;
int size;
char *name;
} t_variable;
typedef struct {
t_id dest, source;
} t_reg;
typedef struct {
int addr_size, word_size;
t_id write_enable, write_addr, data;
} t_ram;
typedef struct {
int type;
t_id dest_var;
union {
struct {
t_id a;
} Copy;
struct {
t_id a;
} Not;
struct {
int op;
t_id a, b;
} Binop;
struct {
t_id a, b, c;
} Mux;
struct {
t_rom *rom;
t_id read_addr;
} Rom;
struct {
t_id a, b;
int shift;
} Concat;
struct {
int begin, end;
t_id source;
} Slice;
struct {
int i;
t_id source;
} Select;
struct {
int ram_id;
t_id source;
} ReadRAM;
};
} t_equation;
typedef struct {
int n_vars, n_inputs, n_outputs;
t_variable *vars;
t_id *inputs, *outputs;
int n_regs, n_rams;
t_reg *regs;
t_ram *rams;
int n_eqs;
t_equation *eqs;
} t_program;
// machine = execution instance
typedef struct {
t_program *prog;
t_value *var_values; // indexed by variable ID
t_value *reg_data; // indexed by number in register list
t_value **ram_data; // indexed by number in ram list
} t_machine;
// The functions for doing stuff with these data structures
// Implemented in load.c
t_program *load_dumb_netlist(FILE *stream);
void add_rom(const char *prefix, FILE *file);
// Implemented in sim.c
t_machine *init_machine(t_program *p);
void read_inputs(t_machine *m, FILE *stream);
void machine_step(t_machine *m);
void write_outputs(t_machine *m, FILE *stream);
// Implemented in util.c
int pow2(int exp);
t_value read_bool(FILE *stream, t_value *mask);
int is_prefix(const char *prefix, const char *str);
#endif
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