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

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/***************************************************************
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