示例#1
0
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;
}
示例#2
0
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);
}
示例#3
0
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;
}
示例#4
0
文件: vmstate.c 项目: mmuman/qemu
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);
}