Commit f603a687 authored by Peter Maydell's avatar Peter Maydell Committed by Anthony Liguori

HACKING: clarify allocation/free recommendations

Clarify the allocation/free recommendations; this is mostly
just tidying up following the global-search-and-replace done
with the conversion to the GLib g_malloc and friends.
Reviewed-by: default avatarStefan Hajnoczi <>
Signed-off-by: default avatarPeter Maydell <>
Signed-off-by: default avatarAnthony Liguori <>
parent db3a5ed7
......@@ -77,11 +77,13 @@ avoided.
Use of the malloc/free/realloc/calloc/valloc/memalign/posix_memalign
APIs is not allowed in the QEMU codebase. Instead of these routines,
use the replacement g_malloc/g_malloc0/g_realloc/g_free or
qemu_vmalloc/qemu_memalign/qemu_vfree APIs.
use the GLib memory allocation routines g_malloc/g_malloc0/g_new/
g_new0/g_realloc/g_free or QEMU's qemu_vmalloc/qemu_memalign/qemu_vfree
Please note that NULL check for the g_malloc result is redundant and
that g_malloc() call with zero size is not allowed.
Please note that g_malloc will exit on allocation failure, so there
is no need to test for failure (as you would have to with malloc).
Calling g_malloc with a zero size is valid and will return NULL.
Memory allocated by qemu_vmalloc or qemu_memalign must be freed with
qemu_vfree, since breaking this will cause problems on Win32 and user
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