|
 |
7e86df |
From e050064b67c501e9fdc7bc3f513ba2b8b9e795f8 Mon Sep 17 00:00:00 2001
|
|
|
7e86df |
From: David Mitchell <davem@iabyn.com>
|
|
|
7e86df |
Date: Fri, 30 Oct 2020 20:50:58 +0000
|
|
|
7e86df |
Subject: [PATCH] Perl_custom_op_get_field(): remove undef behaviour
|
|
|
7e86df |
MIME-Version: 1.0
|
|
|
7e86df |
Content-Type: text/plain; charset=UTF-8
|
|
|
7e86df |
Content-Transfer-Encoding: 8bit
|
|
|
7e86df |
|
|
|
7e86df |
Thus function has a couple a switches with
|
|
|
7e86df |
|
|
|
7e86df |
default:
|
|
|
7e86df |
NOT_REACHED; /* NOTREACHED */
|
|
|
7e86df |
|
|
|
7e86df |
but clang is complaining that the value returned by the function is
|
|
|
7e86df |
undefined if those default branches are taken, since the 'any' variable
|
|
|
7e86df |
doesn't get set in that path.
|
|
|
7e86df |
|
|
|
7e86df |
Replace the NOTREACHED with a croak("panic: ..."). It's possible (albeit
|
|
|
7e86df |
not intended) for Perl_custom_op_get_field() to be called with a 'field'
|
|
|
7e86df |
arg which triggers the default case. So if this ever happens, make it
|
|
|
7e86df |
clear that something has gone wrong, rather than just silently
|
|
|
7e86df |
continuing on non-debugging builds.
|
|
|
7e86df |
|
|
|
7e86df |
In any case, this shuts up clang.
|
|
|
7e86df |
|
|
|
7e86df |
Signed-off-by: Petr Písař <ppisar@redhat.com>
|
|
|
7e86df |
---
|
|
|
7e86df |
op.c | 14 ++++++--------
|
|
|
7e86df |
1 file changed, 6 insertions(+), 8 deletions(-)
|
|
|
7e86df |
|
|
|
7e86df |
diff --git a/op.c b/op.c
|
|
|
7e86df |
index c30c6b7c8f..2933e2ed7d 100644
|
|
|
7e86df |
--- a/op.c
|
|
|
7e86df |
+++ b/op.c
|
|
|
7e86df |
@@ -18100,6 +18100,7 @@ Perl_custom_op_get_field(pTHX_ const OP *o, const xop_flags_enum field)
|
|
|
7e86df |
else
|
|
|
7e86df |
xop = INT2PTR(XOP *, SvIV(HeVAL(he)));
|
|
|
7e86df |
}
|
|
|
7e86df |
+
|
|
|
7e86df |
{
|
|
|
7e86df |
XOPRETANY any;
|
|
|
7e86df |
if(field == XOPe_xop_ptr) {
|
|
|
7e86df |
@@ -18121,7 +18122,10 @@ Perl_custom_op_get_field(pTHX_ const OP *o, const xop_flags_enum field)
|
|
|
7e86df |
any.xop_peep = xop->xop_peep;
|
|
|
7e86df |
break;
|
|
|
7e86df |
default:
|
|
|
7e86df |
- NOT_REACHED; /* NOTREACHED */
|
|
|
7e86df |
+ field_panic:
|
|
|
7e86df |
+ Perl_croak(aTHX_
|
|
|
7e86df |
+ "panic: custom_op_get_field(): invalid field %d\n",
|
|
|
7e86df |
+ (int)field);
|
|
|
7e86df |
break;
|
|
|
7e86df |
}
|
|
|
7e86df |
} else {
|
|
|
7e86df |
@@ -18139,17 +18143,11 @@ Perl_custom_op_get_field(pTHX_ const OP *o, const xop_flags_enum field)
|
|
|
7e86df |
any.xop_peep = XOPd_xop_peep;
|
|
|
7e86df |
break;
|
|
|
7e86df |
default:
|
|
|
7e86df |
- NOT_REACHED; /* NOTREACHED */
|
|
|
7e86df |
+ goto field_panic;
|
|
|
7e86df |
break;
|
|
|
7e86df |
}
|
|
|
7e86df |
}
|
|
|
7e86df |
}
|
|
|
7e86df |
- /* On some platforms (HP-UX, IA64) gcc emits a warning for this function:
|
|
|
7e86df |
- * op.c: In function 'Perl_custom_op_get_field':
|
|
|
7e86df |
- * op.c:...: warning: 'any.xop_name' may be used uninitialized in this function [-Wmaybe-uninitialized]
|
|
|
7e86df |
- * This is because on those platforms (with -DEBUGGING) NOT_REACHED
|
|
|
7e86df |
- * expands to assert(0), which expands to ((0) ? (void)0 :
|
|
|
7e86df |
- * __assert(...)), and gcc doesn't know that __assert can never return. */
|
|
|
7e86df |
return any;
|
|
|
7e86df |
}
|
|
|
7e86df |
}
|
|
|
7e86df |
--
|
|
|
7e86df |
2.25.4
|
|
|
7e86df |
|