From 927a446bd3e3867df746f3049a28cfd5c6592135 Mon Sep 17 00:00:00 2001
From: Bill Currie <bill@taniwha.org>
Date: Wed, 9 Jun 2021 12:08:13 +0900
Subject: [PATCH] [qfcc] Ensure type src type is a class

If the src type is not a class, there is no inheritance chain to walk.
Fixes a segfault when returning self after a syntax error in the
following:

    +(EditStatus *)withRect:(Rect)rect
    {
	return [[[self alloc] initWithRect:rect]:
    }

    -setCursorMode:(CursorMode)mode
    {
	cursorMode = mode;
	return self;
    }
---
 tools/qfcc/source/class.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/qfcc/source/class.c b/tools/qfcc/source/class.c
index ddef199fa..b61be1d26 100644
--- a/tools/qfcc/source/class.c
+++ b/tools/qfcc/source/class.c
@@ -455,7 +455,7 @@ category_implements (category_t *cat, protocol_t *protocol)
 int
 obj_types_assignable (const type_t *dst, const type_t *src)
 {
-	class_t    *dst_class, *src_class;
+	class_t    *dst_class, *src_class = 0;
 	category_t *cat;
 	int         dst_is_proto, src_is_proto;
 	protocollist_t *dst_protos = 0, *src_protos = 0;
@@ -507,7 +507,9 @@ obj_types_assignable (const type_t *dst, const type_t *src)
 
 	// check dst is a base class of src
 	dst_class = dst->t.fldptr.type->t.class;
-	src_class = src->t.fldptr.type->t.class;
+	if (src->t.fldptr.type->meta == ty_class) {
+		src_class = src->t.fldptr.type->t.class;
+	}
 	//printf ("%s %s\n", dst_class->name, src_class->name);
 	while (dst_class != src_class && src_class) {
 		src_class = src_class->super_class;