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authorPhilippe Mathieu-Daudé <philmd@redhat.com>2020-03-04 16:38:15 +0100
committerPaolo Bonzini <pbonzini@redhat.com>2020-03-16 22:07:42 +0100
commitf7795e4096d8bd1c767c5ddb450fa859ff20490e (patch)
treec7767c88747e00be8118f81349bce043bc2f2959 /hw/virtio
parent770275ed0c0ab05677472efcf184b1a02ab14d07 (diff)
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misc: Replace zero-length arrays with flexible array member (automatic)
Description copied from Linux kernel commit from Gustavo A. R. Silva (see [3]): --v-- description start --v-- The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member [1], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being unadvertenly introduced [2] to the Linux codebase from now on. --^-- description end --^-- Do the similar housekeeping in the QEMU codebase (which uses C99 since commit 7be41675f7cb). All these instances of code were found with the help of the following Coccinelle script: @@ identifier s, m, a; type t, T; @@ struct s { ... t m; - T a[0]; + T a[]; }; @@ identifier s, m, a; type t, T; @@ struct s { ... t m; - T a[0]; + T a[]; } QEMU_PACKED; [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=76497732932f [3] https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git/commit/?id=17642a2fbd2c1 Inspired-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Reviewed-by: David Hildenbrand <david@redhat.com> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'hw/virtio')
-rw-r--r--hw/virtio/virtio.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index b2d415e..b6c8ef5 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -54,7 +54,7 @@ typedef struct VRingAvail
{
uint16_t flags;
uint16_t idx;
- uint16_t ring[0];
+ uint16_t ring[];
} VRingAvail;
typedef struct VRingUsedElem
@@ -67,7 +67,7 @@ typedef struct VRingUsed
{
uint16_t flags;
uint16_t idx;
- VRingUsedElem ring[0];
+ VRingUsedElem ring[];
} VRingUsed;
typedef struct VRingMemoryRegionCaches {