throw.c

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/*
 * This file is part of the Fun programming language.
 * https://fun-lang.xyz/
 *
 * Copyright 2025 Johannes Findeisen <you@hanez.org>
 * Licensed under the terms of the Apache-2.0 license.
 * https://opensource.org/license/apache-2-0
 */


case OP_THROW: {
 Value err = pop_value(vm);
 /* if there is a handler in this frame, jump to it and push err for catch */
 if (f->try_sp >= 0) {
 int try_idx = f->try_stack[f->try_sp--];
 int target = f->fn->instructions[try_idx].operand;
 /* push error for catch block */
 push_value(vm, err); /* transfer ownership to stack */
 f->ip = target;
 break;
 }
 /* Unhandled: print error and terminate */
 char *s = value_to_string_alloc(&err);
 if (s) {
 fprintf(stdout, "%s\n", s);
 free(s);
 } else {
 fprintf(stdout, "<error>\n");
 }
 free_value(err);
 /* clear frames to stop execution */
 vm->fp = -1;
 break;
}