retroforth/vm/nga-c/dev-error.c

/***************************************************************
  Copyright (c) Charles Childers
 **************************************************************/

/*
| 001 | Data Stack Underflow     |
| 002 | Data Stack Overflow      |
| 003 | Address Stack Underflow  |
| 004 | Address Stack Overflow   |
| 005 | Invalid Memory Access    |
| 006 | Division by Zero         |
*/

#ifdef ENABLE_ERROR
void execute(NgaState *vm, CELL cell);

void handle_error(NgaState *vm, CELL error) {
  CELL saved_ip = vm->cpu[vm->active].ip;
  if (vm->ErrorHandlers[error] != 0) {
    printf("\nHandling %lld\n", error);
    execute(vm, vm->ErrorHandlers[error]);
  }
  vm->cpu[vm->active].ip = saved_ip;
}

void register_error_handler(NgaState *vm) {
  CELL ErrorID = stack_pop(vm);
  CELL ErrorHandler = stack_pop(vm);
  vm->ErrorHandlers[ErrorID] = ErrorHandler;
  printf("Assigned %lld to %lld\n", ErrorID, ErrorHandler);
}

void io_error(NgaState *vm) {
  switch (stack_pop(vm)) {
    case 0: register_error_handler(vm); break;
    default: break;
  }
}

void query_error(NgaState *vm) {
  stack_push(vm, 0);
  stack_push(vm, 1234);
}

#endif