static bool vmsd_can_compress(const VMStateField *field)
{
if (field->field_exists) {
/* Dynamically existing fields mess up compression */
return false;
}
if (field->flags & VMS_STRUCT) {
const VMStateField *sfield = field->vmsd->fields;
while (sfield->name) {
if (!vmsd_can_compress(sfield)) {
/* Child elements can't compress, so can't we */
return false;
}
sfield++;
}
if (field->vmsd->subsections) {
/* Subsections may come and go, better don't compress */
return false;
}
}
return true;
}
static void vmsd_desc_field_start(const VMStateDescription *vmsd, QJSON *vmdesc,
const VMStateField *field, int i, int max)
{
char *name, *old_name;
bool is_array = max > 1;
bool can_compress = vmsd_can_compress(field);
if (!vmdesc) {
return;
}
name = g_strdup(field->name);
/* Field name is not unique, need to make it unique */
if (!vmfield_name_is_unique(vmsd->fields, field)) {
int num = vmfield_name_num(vmsd->fields, field);
old_name = name;
name = g_strdup_printf("%s[%d]", name, num);
g_free(old_name);
}
json_start_object(vmdesc, NULL);
json_prop_str(vmdesc, "name", name);
if (is_array) {
if (can_compress) {
json_prop_int(vmdesc, "array_len", max);
} else {
json_prop_int(vmdesc, "index", i);
}
}
json_prop_str(vmdesc, "type", vmfield_get_type_name(field));
if (field->flags & VMS_STRUCT) {
json_start_object(vmdesc, "struct");
}
g_free(name);
}
int vmstate_save_state_v(QEMUFile *f, const VMStateDescription *vmsd,
void *opaque, QJSON *vmdesc, int version_id)
{
int ret = 0;
const VMStateField *field = vmsd->fields;
trace_vmstate_save_state_top(vmsd->name);
if (vmsd->pre_save) {
ret = vmsd->pre_save(opaque);
trace_vmstate_save_state_pre_save_res(vmsd->name, ret);
if (ret) {
error_report("pre-save failed: %s", vmsd->name);
return ret;
}
}
if (vmdesc) {
json_prop_str(vmdesc, "vmsd_name", vmsd->name);
json_prop_int(vmdesc, "version", version_id);
json_start_array(vmdesc, "fields");
}
while (field->name) {
if ((field->field_exists &&
field->field_exists(opaque, version_id)) ||
(!field->field_exists &&
field->version_id <= version_id)) {
void *first_elem = opaque + field->offset;
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;
trace_vmstate_save_state_loop(vmsd->name, field->name, n_elems);
if (field->flags & VMS_POINTER) {
first_elem = *(void **)first_elem;
assert(first_elem || !n_elems || !size);
}
for (i = 0; i < n_elems; i++) {
void *curr_elem = first_elem + size * i;
ret = 0;
vmsd_desc_field_start(vmsd, vmdesc_loop, field, i, n_elems);
old_offset = qemu_ftell_fast(f);
if (field->flags & VMS_ARRAY_OF_POINTER) {
assert(curr_elem);
curr_elem = *(void **)curr_elem;
}
if (!curr_elem && size) {
/* if null pointer write placeholder and do not follow */
assert(field->flags & VMS_ARRAY_OF_POINTER);
ret = vmstate_info_nullptr.put(f, curr_elem, size, NULL,
NULL);
} else if (field->flags & VMS_STRUCT) {
ret = vmstate_save_state(f, field->vmsd, curr_elem,
vmdesc_loop);
} else if (field->flags & VMS_VSTRUCT) {
ret = vmstate_save_state_v(f, field->vmsd, curr_elem,
vmdesc_loop,
field->struct_version_id);
} else {
ret = field->info->put(f, curr_elem, size, field,
vmdesc_loop);
}
if (ret) {
error_report("Save of field %s/%s failed",
vmsd->name, field->name);
if (vmsd->post_save) {
vmsd->post_save(opaque);
}
return ret;
}
written_bytes = qemu_ftell_fast(f) - old_offset;
vmsd_desc_field_end(vmsd, vmdesc_loop, field, written_bytes, i);
/* Compressed arrays only care about the first element */
if (vmdesc_loop && vmsd_can_compress(field)) {
vmdesc_loop = NULL;
}
}
} else {
if (field->flags & VMS_MUST_EXIST) {
error_report("Output state validation failed: %s/%s",
vmsd->name, field->name);
assert(!(field->flags & VMS_MUST_EXIST));
}
}
field++;
}
if (vmdesc) {
json_end_array(vmdesc);
}
ret = vmstate_subsection_save(f, vmsd, opaque, vmdesc);
if (vmsd->post_save) {
int ps_ret = vmsd->post_save(opaque);
if (!ret) {
ret = ps_ret;
}
}
return ret;
}
void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
void *opaque, QJSON *vmdesc)
{
VMStateField *field = vmsd->fields;
trace_vmstate_save_state_top(vmsd->name);
if (vmsd->pre_save) {
vmsd->pre_save(opaque);
}
if (vmdesc) {
json_prop_str(vmdesc, "vmsd_name", vmsd->name);
json_prop_int(vmdesc, "version", vmsd->version_id);
json_start_array(vmdesc, "fields");
}
while (field->name) {
if (!field->field_exists ||
field->field_exists(opaque, vmsd->version_id)) {
void *base_addr = 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;
trace_vmstate_save_state_loop(vmsd->name, field->name, n_elems);
for (i = 0; i < n_elems; i++) {
void *addr = base_addr + 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;
}
if (field->flags & VMS_STRUCT) {
vmstate_save_state(f, field->vmsd, addr, vmdesc_loop);
} else {
field->info->put(f, addr, size, field, vmdesc_loop);
}
written_bytes = qemu_ftell_fast(f) - old_offset;
vmsd_desc_field_end(vmsd, vmdesc_loop, field, written_bytes, i);
/* Compressed arrays only care about the first element */
if (vmdesc_loop && vmsd_can_compress(field)) {
vmdesc_loop = NULL;
}
}
} else {
if (field->flags & VMS_MUST_EXIST) {
error_report("Output state validation failed: %s/%s",
vmsd->name, field->name);
assert(!(field->flags & VMS_MUST_EXIST));
}
}
field++;
}
if (vmdesc) {
json_end_array(vmdesc);
}
vmstate_subsection_save(f, vmsd, opaque, vmdesc);
}