all repos — xyw @ e3cdbb1b205d3ce3a5e8a3f975d6ff19835e155a

A minimal virtual machine and assembler for terminals.

xyw.h

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#ifndef XYW_H
#define XYW_H

#define XYW_MODE_X 0x80
#define XYW_MODE_Y 0x40
#define XYW_MODE_W 0x20
#define XYW_TOTAL_INSTRUCTIONS 0x20
#define XYW_TOTAL_DEVICES 0x10
#define XYW_ARGUMENT_SEPARATOR 0x1E
#define XYW_END_OF_ARGUMENTS 0x1D

typedef unsigned char xyw_byte;
typedef unsigned short xyw_word;

// clang-format off
#define XYW_PEEKW(d) (*(d) << 8 | (d)[1])
#define XYW_POKEW(d, v) { *(d) = (v) >> 8; (d)[1] = (v); }
#define XYW_DBG(...) do { if (xyw_debug) fprintf(stdout, __VA_ARGS__); } while(0)
// clang-format on

// Devices API
typedef xyw_byte (*xyw_input)(xyw_byte *data, xyw_byte addr, xyw_byte *error);
typedef void (*xyw_output)(xyw_byte *data, xyw_byte addr, xyw_byte *error);
typedef void (*xyw_init)(xyw_byte *data);

typedef struct xyw_device
{
    xyw_byte *data;
    xyw_init init;
    xyw_input input;
    xyw_output output;
} xyw_device;

typedef struct
{
    xyw_word handler;
    int pending;
} xyw_vector_slot;

void xyw_request_vector(xyw_word handler);

// Main Globals
extern xyw_device xyw_devices[XYW_TOTAL_DEVICES];
extern const char xyw_instructions[][4];
extern int xyw_debug;
extern int xyw_argc;
extern char *xyw_argv[];
extern int xyw_argv_processed;

// Main public API
int xyw_assemble(const char *input, const char *output);
int xyw_run(const char *input);
int xyw_eval(xyw_word pc);

#endif // XYW_H