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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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5
src/vim9expr.c
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@@ -2836,12 +2836,13 @@ compile_expr8(char_u **arg, cctx_T *cctx, ppconst_T *ppconst)
type_T *actual;
where_T where = WHERE_INIT;
where.wt_kind = WT_CAST;
generate_ppconst(cctx, ppconst);
actual = get_type_on_stack(cctx, 0);
if (check_type_maybe(want_type, actual, FALSE, where) != OK)
{
if (need_type(actual, want_type, FALSE,
-1, 0, cctx, FALSE, FALSE) == FAIL)
if (need_type_where(actual, want_type, FALSE, -1, where, cctx, FALSE, FALSE)
== FAIL)
return FAIL;
}
}