rb_copy_generic_ivar: handle 0 capacity shapes

byroot · byroot · commit 6cd7549434dd · 2025-05-05T10:20:41.000+02:00
diff --git a/variable.c b/variable.c
@@ -2331,6 +2331,12 @@ rb_copy_generic_ivar(VALUE dest, VALUE obj)
             }
         }
 
+        if (!shape_to_set_on_dest->capacity) {
+            rb_shape_set_shape(dest, shape_to_set_on_dest);
+            FL_UNSET(dest, FL_EXIVAR);
+            return;
+        }
+
         new_fields_tbl = gen_fields_tbl_resize(0, shape_to_set_on_dest->capacity);
 
         VALUE *src_buf = obj_fields_tbl->as.shape.fields;

Original file line number	Diff line number	Diff line change
`@@ -2331,6 +2331,12 @@ rb_copy_generic_ivar(VALUE dest, VALUE obj)`
`2331`	`2331`	`}`
`2332`	`2332`	`}`
`2333`	`2333`
	`2334`	`+ if (!shape_to_set_on_dest->capacity) {`
	`2335`	`+ rb_shape_set_shape(dest, shape_to_set_on_dest);`
	`2336`	`+ FL_UNSET(dest, FL_EXIVAR);`
	`2337`	`+ return;`
	`2338`	`+ }`
	`2339`	`+`
`2334`	`2340`	`new_fields_tbl = gen_fields_tbl_resize(0, shape_to_set_on_dest->capacity);`
`2335`	`2341`
`2336`	`2342`	`VALUE *src_buf = obj_fields_tbl->as.shape.fields;`