#ifndef VM_H
#define VM_H

#include <stddef.h>

// Increase registers and memory sizes for advanced programs.
#define NUM_REGISTERS 16   // Number of general-purpose registers.
#define STACK_SIZE    512  // Maximum stack size.
#define PROGRAM_SIZE  2048 // Maximum program size (number of ints).

// VM structure definition.
typedef struct VM {
    int registers[NUM_REGISTERS];  // General purpose registers.
    int stack[STACK_SIZE];         // Stack memory.
    int sp;                        // Stack pointer (index of next free slot).
    int program[PROGRAM_SIZE];     // Bytecode program memory.
    size_t program_size;           // Number of ints in the loaded program.
    size_t pc;                     // Program counter.
} VM;

// Function prototypes for the VM.
void init_vm(VM *vm);
int load_program(VM *vm, const int *program, size_t size);
void run_vm(VM *vm);

#endif // VM_H