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patch 9.1.0523: Vim9: cannot downcast an object

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Problem:  Vim9: cannot downcast an object (Ernie Rael)
Solution: Fix class downcasting issue (LemonBoy).

When casting an object from one class to another the target type may be
a subclass (downcast) or superclass (upcast) of the source one.
Upcasts require a runtime type check to be emitted.

Add a disassembly test.

fixes: #13244
closes: #15079

Signed-off-by: LemonBoy <thatlemon@gmail.com>
Signed-off-by: Yegappan Lakshmanan <yegappan@yahoo.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
LemonBoy
2024-07-04 17:03:17 +02:00
committed by Christian Brabandt
parent 05ff4e42fb
commit 50d485432c
7 changed files with 104 additions and 4 deletions
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2
src/vim9compile.c
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@@ -522,6 +522,8 @@ use_typecheck(type_T *actual, type_T *expected)
(actual->tt_member == &t_void)
== (expected->tt_member == &t_void))))
return TRUE;
if (actual->tt_type == VAR_OBJECT && expected->tt_type == VAR_OBJECT)
return TRUE;
if ((actual->tt_type == VAR_LIST || actual->tt_type == VAR_DICT)
&& actual->tt_type == expected->tt_type)
// This takes care of a nested list or dict.