Re: [Qemu-devel] [PATCH] Introduce QEMU_NEW()

[Stefan Hajnoczi]

On Mon, Jul 25, 2011 at 9:51 AM, Avi Kivity <address@hidden> wrote:
> qemu_malloc() is type-unsafe as it returns a void pointer.  Introduce
> QEMU_NEW() (and QEMU_NEWZ()), which return the correct type.
>
> Signed-off-by: Avi Kivity <address@hidden>
> ---
>
> This is part of my memory API patchset, but doesn't really belong there.
>
>  qemu-common.h |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
>
> diff --git a/qemu-common.h b/qemu-common.h
> index ba55719..66effa3 100644
> --- a/qemu-common.h
> +++ b/qemu-common.h
> @@ -186,6 +186,9 @@ void qemu_free(void *ptr);
>  char *qemu_strdup(const char *str);
>  char *qemu_strndup(const char *str, size_t size);
>
> +#define QEMU_NEW(type) ((type *)(qemu_malloc(sizeof(type))))
> +#define QEMU_NEWZ(type) ((type *)(qemu_mallocz(sizeof(type))))

Does this mean we need to duplicate the type name for each allocation?

struct foo *f;

...
f = qemu_malloc(sizeof(*f));

Becomes:

struct foo *f;

...
f = QEMU_NEW(struct foo);

If you ever change the name of the type you have to search-replace
these instances.  The idomatic C way works well, I don't see a reason
to use QEMU_NEW().

Stefan