[src/trunk]: src tests/lint: demonstrate assertion failure in initialization

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

details:   https://anonhg.NetBSD.org/src/rev/14395ba2de53
branches:  trunk
changeset: 1020615:14395ba2de53
user:      rillig <rillig%NetBSD.org@localhost>
date:      Sat Apr 17 20:36:17 2021 +0000

description:
tests/lint: demonstrate assertion failure in initialization

diffstat:

 distrib/sets/lists/tests/mi                             |   4 +-
 tests/usr.bin/xlint/lint1/Makefile                      |   4 +-
 tests/usr.bin/xlint/lint1/gcc_init_compound_literal.c   |  30 +++++++++++++++++
 tests/usr.bin/xlint/lint1/gcc_init_compound_literal.exp |   1 +
 tests/usr.bin/xlint/lint1/t_integration.sh              |   4 +-
 5 files changed, 40 insertions(+), 3 deletions(-)

diffs (93 lines):

diff -r 3b7243cfecbd -r 14395ba2de53 distrib/sets/lists/tests/mi
--- a/distrib/sets/lists/tests/mi       Sat Apr 17 20:12:55 2021 +0000
+++ b/distrib/sets/lists/tests/mi       Sat Apr 17 20:36:17 2021 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: mi,v 1.1041 2021/04/15 19:02:29 rillig Exp $
+# $NetBSD: mi,v 1.1042 2021/04/17 20:36:17 rillig Exp $
 #
 # Note: don't delete entries from here - mark them as "obsolete" instead.
 #
@@ -6186,6 +6186,8 @@
 ./usr/tests/usr.bin/xlint/lint1/d_zero_sized_arrays.c          tests-usr.bin-tests     compattestfile,atf
 ./usr/tests/usr.bin/xlint/lint1/feat_stacktrace.c              tests-usr.bin-tests     compattestfile,atf
 ./usr/tests/usr.bin/xlint/lint1/feat_stacktrace.exp            tests-usr.bin-tests     compattestfile,atf
+./usr/tests/usr.bin/xlint/lint1/gcc_init_compound_literal.c    tests-usr.bin-tests     compattestfile,atf
+./usr/tests/usr.bin/xlint/lint1/gcc_init_compound_literal.exp  tests-usr.bin-tests     compattestfile,atf
 ./usr/tests/usr.bin/xlint/lint1/msg_000.c                      tests-usr.bin-tests     compattestfile,atf
 ./usr/tests/usr.bin/xlint/lint1/msg_000.exp                    tests-usr.bin-tests     compattestfile,atf
 ./usr/tests/usr.bin/xlint/lint1/msg_001.c                      tests-usr.bin-tests     compattestfile,atf
diff -r 3b7243cfecbd -r 14395ba2de53 tests/usr.bin/xlint/lint1/Makefile
--- a/tests/usr.bin/xlint/lint1/Makefile        Sat Apr 17 20:12:55 2021 +0000
+++ b/tests/usr.bin/xlint/lint1/Makefile        Sat Apr 17 20:36:17 2021 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: Makefile,v 1.42 2021/04/14 18:27:11 rillig Exp $
+# $NetBSD: Makefile,v 1.43 2021/04/17 20:36:17 rillig Exp $
 
 NOMAN=         # defined
 MAX_MESSAGE=   343             # see lint1/err.c
@@ -102,6 +102,8 @@
 FILES+=                d_zero_sized_arrays.c
 FILES+=                feat_stacktrace.c
 FILES+=                feat_stacktrace.exp
+FILES+=                gcc_init_compound_literal.c
+FILES+=                gcc_init_compound_literal.exp
 FILES+=                ${:U0 ${:U:${:Urange=${MAX_MESSAGE}}}:C,^.$,0&,:C,^..$,0&,:@i@msg_${i}.c msg_${i}.exp@:Nmsg_176.exp}
 FILES+=                op_colon.c
 FILES+=                op_colon.exp
diff -r 3b7243cfecbd -r 14395ba2de53 tests/usr.bin/xlint/lint1/gcc_init_compound_literal.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/usr.bin/xlint/lint1/gcc_init_compound_literal.c     Sat Apr 17 20:36:17 2021 +0000
@@ -0,0 +1,30 @@
+/*     $NetBSD: gcc_init_compound_literal.c,v 1.1 2021/04/17 20:36:17 rillig Exp $     */
+# 3 "gcc_init_compound_literal.c"
+
+/*
+ * C99 says in 6.7.8p4:
+ *
+ *     All the expressions in an initializer for an object that has static
+ *     storage duration shall be constant expressions or string literals.
+ *
+ * The term "constant expression" is defined in C99 6.6 and is quite
+ * restricted, except for a single paragraph, 6.6p10:
+ *
+ *     An implementation may accept other forms of constant expressions.
+ *
+ * GCC additionally allows compound expressions, and these can even use the
+ * array-to-pointer conversion from C99 6.3.2.1, which allows to initialize a
+ * pointer object with a pointer to a direct-value statically allocated array.
+ */
+
+// Seen in sys/crypto/aes/aes_ccm.c.
+const struct {
+    const unsigned char *ctxt;
+} T = {
+       (void *)0,
+       (void *)0,      /* expect: too many struct/union initializers */
+// FIXME: lint: assertion "sym->s_scl == EXTERN || sym->s_scl == STATIC" failed
+//     .ctxt = (const unsigned char[4]){
+//         1, 2, 3, 4
+//     },
+};
diff -r 3b7243cfecbd -r 14395ba2de53 tests/usr.bin/xlint/lint1/gcc_init_compound_literal.exp
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/usr.bin/xlint/lint1/gcc_init_compound_literal.exp   Sat Apr 17 20:36:17 2021 +0000
@@ -0,0 +1,1 @@
+gcc_init_compound_literal.c(25): error: too many struct/union initializers [172]
diff -r 3b7243cfecbd -r 14395ba2de53 tests/usr.bin/xlint/lint1/t_integration.sh
--- a/tests/usr.bin/xlint/lint1/t_integration.sh        Sat Apr 17 20:12:55 2021 +0000
+++ b/tests/usr.bin/xlint/lint1/t_integration.sh        Sat Apr 17 20:36:17 2021 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: t_integration.sh,v 1.41 2021/04/14 18:27:11 rillig Exp $
+# $NetBSD: t_integration.sh,v 1.42 2021/04/17 20:36:17 rillig Exp $
 #
 # Copyright (c) 2008, 2010 The NetBSD Foundation, Inc.
 # All rights reserved.
@@ -166,6 +166,8 @@
 test_case d_incorrect_array_size
 test_case d_long_double_int
 
+test_case gcc_init_compound_literal
+
 test_case op_colon
 
 test_case feat_stacktrace