fz-lang/include/common/fzl_extern.h

#ifndef FZL_EXTERN_H
#define FZL_EXTERN_H

#include <common/fzl_types.h>
#include <stddef.h>

// External library entry types
typedef enum
{
  FZL_EXTERN_KIND_PRIMITIVE,
  FZL_EXTERN_KIND_HANDLE,
  FZL_EXTERN_KIND_STRUCT,
  FZL_EXTERN_KIND_REF,
  FZL_EXTERN_KIND_ALIAS,
} fzl_extern_kind_t;

// External library structure field descriptor
typedef struct
{
  char *name;
  fzl_type_t type;
} fzl_extern_struct_field_t;

// Extern symbol type descriptor
typedef struct fzl_extern_type
{
  size_t lib_slot;
  fzl_extern_kind_t kind;
  char *symbol_name;
  char *used_name;

  union
  {
    // Structure data
    struct
    {
      fzl_extern_struct_field_t **fields;
      size_t fields_count;
    } structure;

    // Reference
    struct fzl_extern_type *ref_of;

    // Aliasing type
    fzl_type_t alias;

    // Primitive type
    // NOTE: same type as `.alias` just for readable format
    fzl_type_t primitive;
  };
} fzl_extern_type_t;

// Extern symbol function descriptor
typedef struct
{
  size_t lib_slot;
  char *symbol_name;
  char *used_name;

  fzl_extern_type_t *ret_type;

  fzl_extern_type_t **args;
  size_t args_count;
} fzl_extern_fn_t;

// External library descriptor
typedef struct
{
  char *name;
} fzl_extern_lib_t;

#endif // FZL_EXTERN_H