[src/trunk]: src/tests/usr.bin/xlint/lint1 tests/lint: add test for pointer c...

[rillig <rillig%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/05e0fe36f570
branches:  trunk
changeset: 1020610:05e0fe36f570
user:      rillig <rillig%NetBSD.org@localhost>
date:      Sat Apr 17 16:52:09 2021 +0000

description:
tests/lint: add test for pointer cast from incomplete struct

diffstat:

 tests/usr.bin/xlint/lint1/msg_135.c   |  26 +++++++++++++++++++++++++-
 tests/usr.bin/xlint/lint1/msg_135.exp |   4 +++-
 2 files changed, 28 insertions(+), 2 deletions(-)

diffs (51 lines):

diff -r 5d3c70c4852e -r 05e0fe36f570 tests/usr.bin/xlint/lint1/msg_135.c
--- a/tests/usr.bin/xlint/lint1/msg_135.c       Sat Apr 17 13:25:57 2021 +0000
+++ b/tests/usr.bin/xlint/lint1/msg_135.c       Sat Apr 17 16:52:09 2021 +0000
@@ -1,10 +1,12 @@
-/*     $NetBSD: msg_135.c,v 1.5 2021/02/28 01:20:54 rillig Exp $       */
+/*     $NetBSD: msg_135.c,v 1.6 2021/04/17 16:52:09 rillig Exp $       */
 # 3 "msg_135.c"
 
 // Test for message: converting '%s' to '%s' may cause alignment problem [135]
 
 /* lint1-extra-flags: -h */
 
+void sink(const void *);
+
 unsigned
 read_uint(const unsigned char **pp)
 {
@@ -14,3 +16,25 @@
        pp += sizeof(unsigned);
        return val;
 }
+
+struct incomplete;     /* expect: never defined */
+
+struct complete {
+    int member;
+};
+
+/*
+ * These types of conversions are typically seen in OpenSSL, when converting
+ * from the publicly visible, incomplete 'struct lhash_st' to a private
+ * implementation type such as 'struct lhash_st_OPENSSL_STRING'.
+ *
+ * See openssl/lhash.h.
+ */
+void
+pointer_to_structs(struct incomplete *incomplete)
+{
+       struct complete *complete;
+
+       complete = (struct complete *)incomplete; /* expect: 135 */
+       sink(complete);
+}
diff -r 5d3c70c4852e -r 05e0fe36f570 tests/usr.bin/xlint/lint1/msg_135.exp
--- a/tests/usr.bin/xlint/lint1/msg_135.exp     Sat Apr 17 13:25:57 2021 +0000
+++ b/tests/usr.bin/xlint/lint1/msg_135.exp     Sat Apr 17 16:52:09 2021 +0000
@@ -1,1 +1,3 @@
-msg_135.c(13): warning: converting 'pointer to const unsigned char' to 'pointer to const unsigned int' may cause alignment problem [135]
+msg_135.c(15): warning: converting 'pointer to const unsigned char' to 'pointer to const unsigned int' may cause alignment problem [135]
+msg_135.c(38): warning: converting 'pointer to incomplete struct incomplete' to 'pointer to struct complete' may cause alignment problem [135]
+msg_135.c(20): warning: struct incomplete never defined [233]