xemu/qapi/qapi-visit-core.c
Markus Armbruster 7ce5fc63c7 qapi: Factor out compat_policy_input_ok()
The code to check policy for handling deprecated input is triplicated.
Factor it out into compat_policy_input_ok() before I mess with it in
the next commit.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20211028102520.747396-9-armbru@redhat.com>
[Policy code moved from qmp-dispatch.c to qapi-util.c to make visitors
link without qmp-dispatch.o]
2021-10-29 21:27:20 +02:00

445 lines
11 KiB
C

/*
* Core Definitions for QAPI Visitor Classes
*
* Copyright (C) 2012-2016 Red Hat, Inc.
* Copyright IBM, Corp. 2011
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
* See the COPYING.LIB file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include "qapi/compat-policy.h"
#include "qapi/error.h"
#include "qapi/qmp/qerror.h"
#include "qapi/visitor.h"
#include "qapi/visitor-impl.h"
#include "trace.h"
/* Zero-initialization must result in default policy */
QEMU_BUILD_BUG_ON(COMPAT_POLICY_INPUT_ACCEPT || COMPAT_POLICY_OUTPUT_ACCEPT);
void visit_complete(Visitor *v, void *opaque)
{
assert(v->type != VISITOR_OUTPUT || v->complete);
trace_visit_complete(v, opaque);
if (v->complete) {
v->complete(v, opaque);
}
}
void visit_free(Visitor *v)
{
trace_visit_free(v);
if (v) {
v->free(v);
}
}
bool visit_start_struct(Visitor *v, const char *name, void **obj,
size_t size, Error **errp)
{
bool ok;
trace_visit_start_struct(v, name, obj, size);
if (obj) {
assert(size);
assert(!(v->type & VISITOR_OUTPUT) || *obj);
}
ok = v->start_struct(v, name, obj, size, errp);
if (obj && (v->type & VISITOR_INPUT)) {
assert(ok != !*obj);
}
return ok;
}
bool visit_check_struct(Visitor *v, Error **errp)
{
trace_visit_check_struct(v);
return v->check_struct ? v->check_struct(v, errp) : true;
}
void visit_end_struct(Visitor *v, void **obj)
{
trace_visit_end_struct(v, obj);
v->end_struct(v, obj);
}
bool visit_start_list(Visitor *v, const char *name, GenericList **list,
size_t size, Error **errp)
{
bool ok;
assert(!list || size >= sizeof(GenericList));
trace_visit_start_list(v, name, list, size);
ok = v->start_list(v, name, list, size, errp);
if (list && (v->type & VISITOR_INPUT)) {
assert(ok || !*list);
}
return ok;
}
GenericList *visit_next_list(Visitor *v, GenericList *tail, size_t size)
{
assert(tail && size >= sizeof(GenericList));
trace_visit_next_list(v, tail, size);
return v->next_list(v, tail, size);
}
bool visit_check_list(Visitor *v, Error **errp)
{
trace_visit_check_list(v);
return v->check_list ? v->check_list(v, errp) : true;
}
void visit_end_list(Visitor *v, void **obj)
{
trace_visit_end_list(v, obj);
v->end_list(v, obj);
}
bool visit_start_alternate(Visitor *v, const char *name,
GenericAlternate **obj, size_t size,
Error **errp)
{
bool ok;
assert(obj && size >= sizeof(GenericAlternate));
assert(!(v->type & VISITOR_OUTPUT) || *obj);
trace_visit_start_alternate(v, name, obj, size);
if (!v->start_alternate) {
assert(!(v->type & VISITOR_INPUT));
return true;
}
ok = v->start_alternate(v, name, obj, size, errp);
if (v->type & VISITOR_INPUT) {
assert(ok != !*obj);
}
return ok;
}
void visit_end_alternate(Visitor *v, void **obj)
{
trace_visit_end_alternate(v, obj);
if (v->end_alternate) {
v->end_alternate(v, obj);
}
}
bool visit_optional(Visitor *v, const char *name, bool *present)
{
trace_visit_optional(v, name, present);
if (v->optional) {
v->optional(v, name, present);
}
return *present;
}
bool visit_policy_reject(Visitor *v, const char *name,
unsigned special_features, Error **errp)
{
trace_visit_policy_reject(v, name);
if (v->policy_reject) {
return v->policy_reject(v, name, special_features, errp);
}
return false;
}
bool visit_policy_skip(Visitor *v, const char *name,
unsigned special_features)
{
trace_visit_policy_skip(v, name);
if (v->policy_skip) {
return v->policy_skip(v, name, special_features);
}
return false;
}
void visit_set_policy(Visitor *v, CompatPolicy *policy)
{
v->compat_policy = *policy;
}
bool visit_is_input(Visitor *v)
{
return v->type == VISITOR_INPUT;
}
bool visit_is_dealloc(Visitor *v)
{
return v->type == VISITOR_DEALLOC;
}
bool visit_type_int(Visitor *v, const char *name, int64_t *obj, Error **errp)
{
assert(obj);
trace_visit_type_int(v, name, obj);
return v->type_int64(v, name, obj, errp);
}
static bool visit_type_uintN(Visitor *v, uint64_t *obj, const char *name,
uint64_t max, const char *type, Error **errp)
{
uint64_t value = *obj;
assert(v->type == VISITOR_INPUT || value <= max);
if (!v->type_uint64(v, name, &value, errp)) {
return false;
}
if (value > max) {
assert(v->type == VISITOR_INPUT);
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
name ? name : "null", type);
return false;
}
*obj = value;
return true;
}
bool visit_type_uint8(Visitor *v, const char *name, uint8_t *obj,
Error **errp)
{
uint64_t value;
bool ok;
trace_visit_type_uint8(v, name, obj);
value = *obj;
ok = visit_type_uintN(v, &value, name, UINT8_MAX, "uint8_t", errp);
*obj = value;
return ok;
}
bool visit_type_uint16(Visitor *v, const char *name, uint16_t *obj,
Error **errp)
{
uint64_t value;
bool ok;
trace_visit_type_uint16(v, name, obj);
value = *obj;
ok = visit_type_uintN(v, &value, name, UINT16_MAX, "uint16_t", errp);
*obj = value;
return ok;
}
bool visit_type_uint32(Visitor *v, const char *name, uint32_t *obj,
Error **errp)
{
uint64_t value;
bool ok;
trace_visit_type_uint32(v, name, obj);
value = *obj;
ok = visit_type_uintN(v, &value, name, UINT32_MAX, "uint32_t", errp);
*obj = value;
return ok;
}
bool visit_type_uint64(Visitor *v, const char *name, uint64_t *obj,
Error **errp)
{
assert(obj);
trace_visit_type_uint64(v, name, obj);
return v->type_uint64(v, name, obj, errp);
}
static bool visit_type_intN(Visitor *v, int64_t *obj, const char *name,
int64_t min, int64_t max, const char *type,
Error **errp)
{
int64_t value = *obj;
assert(v->type == VISITOR_INPUT || (value >= min && value <= max));
if (!v->type_int64(v, name, &value, errp)) {
return false;
}
if (value < min || value > max) {
assert(v->type == VISITOR_INPUT);
error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
name ? name : "null", type);
return false;
}
*obj = value;
return true;
}
bool visit_type_int8(Visitor *v, const char *name, int8_t *obj, Error **errp)
{
int64_t value;
bool ok;
trace_visit_type_int8(v, name, obj);
value = *obj;
ok = visit_type_intN(v, &value, name, INT8_MIN, INT8_MAX, "int8_t", errp);
*obj = value;
return ok;
}
bool visit_type_int16(Visitor *v, const char *name, int16_t *obj,
Error **errp)
{
int64_t value;
bool ok;
trace_visit_type_int16(v, name, obj);
value = *obj;
ok = visit_type_intN(v, &value, name, INT16_MIN, INT16_MAX, "int16_t",
errp);
*obj = value;
return ok;
}
bool visit_type_int32(Visitor *v, const char *name, int32_t *obj,
Error **errp)
{
int64_t value;
bool ok;
trace_visit_type_int32(v, name, obj);
value = *obj;
ok = visit_type_intN(v, &value, name, INT32_MIN, INT32_MAX, "int32_t",
errp);
*obj = value;
return ok;
}
bool visit_type_int64(Visitor *v, const char *name, int64_t *obj,
Error **errp)
{
assert(obj);
trace_visit_type_int64(v, name, obj);
return v->type_int64(v, name, obj, errp);
}
bool visit_type_size(Visitor *v, const char *name, uint64_t *obj,
Error **errp)
{
assert(obj);
trace_visit_type_size(v, name, obj);
if (v->type_size) {
return v->type_size(v, name, obj, errp);
}
return v->type_uint64(v, name, obj, errp);
}
bool visit_type_bool(Visitor *v, const char *name, bool *obj, Error **errp)
{
assert(obj);
trace_visit_type_bool(v, name, obj);
return v->type_bool(v, name, obj, errp);
}
bool visit_type_str(Visitor *v, const char *name, char **obj, Error **errp)
{
bool ok;
assert(obj);
/* TODO: Fix callers to not pass NULL when they mean "", so that we
* can enable:
assert(!(v->type & VISITOR_OUTPUT) || *obj);
*/
trace_visit_type_str(v, name, obj);
ok = v->type_str(v, name, obj, errp);
if (v->type & VISITOR_INPUT) {
assert(ok != !*obj);
}
return ok;
}
bool visit_type_number(Visitor *v, const char *name, double *obj,
Error **errp)
{
assert(obj);
trace_visit_type_number(v, name, obj);
return v->type_number(v, name, obj, errp);
}
bool visit_type_any(Visitor *v, const char *name, QObject **obj, Error **errp)
{
bool ok;
assert(obj);
assert(v->type != VISITOR_OUTPUT || *obj);
trace_visit_type_any(v, name, obj);
ok = v->type_any(v, name, obj, errp);
if (v->type == VISITOR_INPUT) {
assert(ok != !*obj);
}
return ok;
}
bool visit_type_null(Visitor *v, const char *name, QNull **obj,
Error **errp)
{
trace_visit_type_null(v, name, obj);
return v->type_null(v, name, obj, errp);
}
static bool output_type_enum(Visitor *v, const char *name, int *obj,
const QEnumLookup *lookup, Error **errp)
{
int value = *obj;
char *enum_str;
enum_str = (char *)qapi_enum_lookup(lookup, value);
return visit_type_str(v, name, &enum_str, errp);
}
static bool input_type_enum(Visitor *v, const char *name, int *obj,
const QEnumLookup *lookup, Error **errp)
{
int64_t value;
g_autofree char *enum_str = NULL;
if (!visit_type_str(v, name, &enum_str, errp)) {
return false;
}
value = qapi_enum_parse(lookup, enum_str, -1, NULL);
if (value < 0) {
error_setg(errp, "Parameter '%s' does not accept value '%s'",
name ? name : "null", enum_str);
return false;
}
if (lookup->special_features
&& !compat_policy_input_ok(lookup->special_features[value],
&v->compat_policy,
ERROR_CLASS_GENERIC_ERROR,
"value", enum_str, errp)) {
return false;
}
*obj = value;
return true;
}
bool visit_type_enum(Visitor *v, const char *name, int *obj,
const QEnumLookup *lookup, Error **errp)
{
assert(obj && lookup);
trace_visit_type_enum(v, name, obj);
switch (v->type) {
case VISITOR_INPUT:
return input_type_enum(v, name, obj, lookup, errp);
case VISITOR_OUTPUT:
return output_type_enum(v, name, obj, lookup, errp);
case VISITOR_CLONE:
/* nothing further to do, scalar value was already copied by
* g_memdup() during visit_start_*() */
return true;
case VISITOR_DEALLOC:
/* nothing to deallocate for a scalar */
return true;
default:
abort();
}
}