From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:36883) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1c438d-00010b-U6 for qemu-devel@nongnu.org; Tue, 08 Nov 2016 04:56:24 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1c438Z-0006v8-BT for qemu-devel@nongnu.org; Tue, 08 Nov 2016 04:56:20 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:53926) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1c438Z-0006uK-3G for qemu-devel@nongnu.org; Tue, 08 Nov 2016 04:56:15 -0500 Received: from pps.filterd (m0098394.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.17/8.16.0.17) with SMTP id uA89sEXg015508 for ; Tue, 8 Nov 2016 04:56:14 -0500 Received: from e06smtp15.uk.ibm.com (e06smtp15.uk.ibm.com [195.75.94.111]) by mx0a-001b2d01.pphosted.com with ESMTP id 26kb2rn39r-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 08 Nov 2016 04:56:13 -0500 Received: from localhost by e06smtp15.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 8 Nov 2016 09:56:11 -0000 Received: from b06cxnps4075.portsmouth.uk.ibm.com (d06relay12.portsmouth.uk.ibm.com [9.149.109.197]) by d06dlp03.portsmouth.uk.ibm.com (Postfix) with ESMTP id E63481B08070 for ; Tue, 8 Nov 2016 09:58:20 +0000 (GMT) Received: from d06av02.portsmouth.uk.ibm.com (d06av02.portsmouth.uk.ibm.com [9.149.37.228]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id uA89u8jq15204810 for ; Tue, 8 Nov 2016 09:56:08 GMT Received: from d06av02.portsmouth.uk.ibm.com (localhost [127.0.0.1]) by d06av02.portsmouth.uk.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id uA89u8vt029320 for ; Tue, 8 Nov 2016 02:56:08 -0700 From: Halil Pasic Date: Tue, 8 Nov 2016 10:56:00 +0100 In-Reply-To: <20161108095603.72301-1-pasic@linux.vnet.ibm.com> References: <20161108095603.72301-1-pasic@linux.vnet.ibm.com> Message-Id: <20161108095603.72301-6-pasic@linux.vnet.ibm.com> Subject: [Qemu-devel] [RFC PATCH v2 5/8] migration/vmstate: renames in (load|save)_state List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Amit Shah , Juan Quintela , Guenther Hutzl , "Dr. David Alan Gilbert" , Halil Pasic The vmstate_(load|save)_state start out with an a void *opaque pointing to some struct, and manipulate one or more elements of one field within that struct. First the field within the struct is pinpointed as opaque + offset, then if this is a pointer the pointer is dereferenced to obtain a pointer to the first element of the vmstate field. Pointers to further elements if any are calculated as first_element + i * element_size (where i is the zero based index of the element in question). Currently base_addr and addr is used as a variable name for the pointer to the first element and the pointer to the current element being processed. This is suboptimal because base_addr is somewhat counter-intuitive (because obtained as base + offset) and both base_addr and addr not very descriptive (that we have a pointer should be clear from the fact that it is declared as a pointer). Let make things easier to understand by renaming base_addr to first_elem and addr to curr_elem. This has the additional benefit of harmonizing with other names within the scope (n_elems, vmstate_n_elems). Signed-off-by: Halil Pasic -- This patch roots in the difficulties I faced when trying to figure out the code in question. In the meanwhile I'm quite fine with the current names because I have it already figured out (after a couple of months not looking on this code however, who knows). Thus my main motivation is making things easier for the next new guy, but if the old guys say not worth it I can very well accept that too. --- migration/vmstate.c | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-) diff --git a/migration/vmstate.c b/migration/vmstate.c index 8767e40..a86fb7e 100644 --- a/migration/vmstate.c +++ b/migration/vmstate.c @@ -108,21 +108,21 @@ int vmstate_load_state(QEMUFile *f, const VMStateDescription *vmsd, field->field_exists(opaque, version_id)) || (!field->field_exists && field->version_id <= version_id)) { - void *base_addr = vmstate_base_addr(opaque, field, true); + void *first_elem = vmstate_base_addr(opaque, field, true); int i, n_elems = vmstate_n_elems(opaque, field); int size = vmstate_size(opaque, field); for (i = 0; i < n_elems; i++) { - void *addr = base_addr + size * i; + void *curr_elem = first_elem + size * i; if (field->flags & VMS_ARRAY_OF_POINTER) { - addr = *(void **)addr; + curr_elem = *(void **)curr_elem; } if (field->flags & VMS_STRUCT) { - ret = vmstate_load_state(f, field->vmsd, addr, + ret = vmstate_load_state(f, field->vmsd, curr_elem, field->vmsd->version_id); } else { - ret = field->info->get(f, addr, size); + ret = field->info->get(f, curr_elem, size); } if (ret >= 0) { @@ -310,25 +310,25 @@ void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd, while (field->name) { if (!field->field_exists || field->field_exists(opaque, vmsd->version_id)) { - void *base_addr = vmstate_base_addr(opaque, field, false); + void *first_elem = vmstate_base_addr(opaque, field, false); int i, n_elems = vmstate_n_elems(opaque, field); int size = vmstate_size(opaque, field); int64_t old_offset, written_bytes; QJSON *vmdesc_loop = vmdesc; for (i = 0; i < n_elems; i++) { - void *addr = base_addr + size * i; + void *curr_elem = first_elem + size * i; vmsd_desc_field_start(vmsd, vmdesc_loop, field, i, n_elems); old_offset = qemu_ftell_fast(f); - if (field->flags & VMS_ARRAY_OF_POINTER) { - addr = *(void **)addr; + assert(curr_elem); + curr_elem = *(void **)curr_elem; } if (field->flags & VMS_STRUCT) { - vmstate_save_state(f, field->vmsd, addr, vmdesc_loop); + vmstate_save_state(f, field->vmsd, curr_elem, vmdesc_loop); } else { - field->info->put(f, addr, size); + field->info->put(f, curr_elem, size); } written_bytes = qemu_ftell_fast(f) - old_offset; -- 2.8.4