79 lines
1.9 KiB
Diff
79 lines
1.9 KiB
Diff
Upstream-Status: Backport
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Signed-off-by: Khem Raj
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2013-08-01 Martin Jambor <mjambor@suse.cz>
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PR middle-end/57748
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* stor-layout.c (compute_record_mode): Treat zero-sized array fields
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like incomplete types.
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testsuite/
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* gcc.dg/torture/pr57748.c: New test.
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Index: gcc-4.8.1/gcc/stor-layout.c
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===================================================================
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--- gcc-4.8.1.orig/gcc/stor-layout.c 2013-04-28 10:29:18.000000000 -0700
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+++ gcc-4.8.1/gcc/stor-layout.c 2013-08-01 15:02:08.018006125 -0700
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@@ -1618,7 +1618,9 @@
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&& integer_zerop (TYPE_SIZE (TREE_TYPE (field)))))
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|| ! host_integerp (bit_position (field), 1)
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|| DECL_SIZE (field) == 0
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- || ! host_integerp (DECL_SIZE (field), 1))
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+ || ! host_integerp (DECL_SIZE (field), 1)
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+ || (TREE_CODE (TREE_TYPE (field)) == ARRAY_TYPE
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+ && tree_low_cst (DECL_SIZE (field), 1) == 0))
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return;
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/* If this field is the whole struct, remember its mode so
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Index: gcc-4.8.1/gcc/testsuite/gcc.dg/torture/pr57748.c
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===================================================================
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--- /dev/null 1970-01-01 00:00:00.000000000 +0000
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+++ gcc-4.8.1/gcc/testsuite/gcc.dg/torture/pr57748.c 2013-08-01 15:02:08.062006126 -0700
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@@ -0,0 +1,45 @@
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+/* PR middle-end/57748 */
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+/* { dg-do run } */
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+
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+#include <stdlib.h>
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+
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+extern void abort (void);
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+
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+typedef long long V
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+ __attribute__ ((vector_size (2 * sizeof (long long)), may_alias));
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+
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+typedef struct S { V a; V b[0]; } P __attribute__((aligned (1)));
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+
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+struct __attribute__((packed)) T { char c; P s; };
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+
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+void __attribute__((noinline, noclone))
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+check (struct T *t)
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+{
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+ if (t->s.b[0][0] != 3 || t->s.b[0][1] != 4)
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+ abort ();
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+}
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+
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+int __attribute__((noinline, noclone))
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+get_i (void)
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+{
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+ return 0;
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+}
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+
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+void __attribute__((noinline, noclone))
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+foo (P *p)
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+{
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+ V a = { 3, 4 };
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+ int i = get_i();
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+ p->b[i] = a;
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+}
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+
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+int
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+main ()
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+{
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+ struct T *t = (struct T *) malloc (128);
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+
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+ foo (&t->s);
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+ check (t);
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+
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+ return 0;
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+}
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