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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][2],
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
inadvertently introduced[3] to the codebase from now on.
Also, notice that, dynamic memory allocations won't be affected by
this change:
"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]
This issue was found with the help of Coccinelle.
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit
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|---|---|---|
| .. | ||
| Kconfig | ||
| Makefile | ||
| vc4_bo.c | ||
| vc4_crtc.c | ||
| vc4_debugfs.c | ||
| vc4_dpi.c | ||
| vc4_drv.c | ||
| vc4_drv.h | ||
| vc4_dsi.c | ||
| vc4_fence.c | ||
| vc4_gem.c | ||
| vc4_hdmi.c | ||
| vc4_hvs.c | ||
| vc4_irq.c | ||
| vc4_kms.c | ||
| vc4_packet.h | ||
| vc4_perfmon.c | ||
| vc4_plane.c | ||
| vc4_qpu_defines.h | ||
| vc4_regs.h | ||
| vc4_render_cl.c | ||
| vc4_trace_points.c | ||
| vc4_trace.h | ||
| vc4_txp.c | ||
| vc4_v3d.c | ||
| vc4_validate_shaders.c | ||
| vc4_validate.c | ||
| vc4_vec.c | ||