@@ -240,7 +240,6 @@ Example:
qapi_dealloc_visitor_cleanup(md);
}
-
void qapi_free_UserDefOne(UserDefOne * obj)
{
QapiDeallocVisitor *md;
@@ -317,49 +316,54 @@ Example:
{
Error *err = NULL;
visit_type_int(m, &(*obj)->integer, "integer", &err);
+ if (err) {
+ goto out;
+ }
visit_type_str(m, &(*obj)->string, "string", &err);
+ if (err) {
+ goto out;
+ }
+ out:
error_propagate(errp, err);
}
void visit_type_UserDefOne(Visitor *m, UserDefOne ** obj, const char *name, Error **errp)
{
- if (!error_is_set(errp)) {
- Error *err = NULL;
- visit_start_struct(m, (void **)obj, "UserDefOne", name, sizeof(UserDefOne), &err);
- if (!err) {
- if (*obj) {
- visit_type_UserDefOne_fields(m, obj, &err);
- error_propagate(errp, err);
- err = NULL;
- }
- /* Always call end_struct if start_struct succeeded. */
- visit_end_struct(m, &err);
+ Error *err = NULL;
+
+ visit_start_struct(m, (void **)obj, "UserDefOne", name, sizeof(UserDefOne), &err);
+ if (!err) {
+ if (*obj) {
+ visit_type_UserDefOne_fields(m, obj, errp);
}
- error_propagate(errp, err);
+ visit_end_struct(m, &err);
}
+ error_propagate(errp, err);
}
void visit_type_UserDefOneList(Visitor *m, UserDefOneList ** obj, const char *name, Error **errp)
{
- GenericList *i, **prev = (GenericList **)obj;
Error *err = NULL;
+ GenericList *i, **prev;
- if (!error_is_set(errp)) {
- visit_start_list(m, name, &err);
- if (!err) {
- for (; (i = visit_next_list(m, prev, &err)) != NULL; prev = &i) {
- UserDefOneList *native_i = (UserDefOneList *)i;
- visit_type_UserDefOne(m, &native_i->value, NULL, &err);
- }
- error_propagate(errp, err);
- err = NULL;
-
- /* Always call end_list if start_list succeeded. */
- visit_end_list(m, &err);
- }
- error_propagate(errp, err);
+ visit_start_list(m, name, &err);
+ if (err) {
+ goto out;
+ }
+
+ for (prev = (GenericList **)obj;
+ !err && (i = visit_next_list(m, prev, &err)) != NULL;
+ prev = &i) {
+ UserDefOneList *native_i = (UserDefOneList *)i;
+ visit_type_UserDefOne(m, &native_i->value, NULL, &err);
}
+
+ error_propagate(errp, err);
+ err = NULL;
+ visit_end_list(m, &err);
+ out:
+ error_propagate(errp, err);
}
mdroth@illuin:~/w/qemu2.git$ cat qapi-generated/example-qapi-visit.h
[Uninteresting stuff omitted...]
@@ -399,15 +403,20 @@ Example:
static void qmp_marshal_output_my_command(UserDefOne * ret_in, QObject **ret_out, Error **errp)
{
+ Error *local_err = NULL;
QmpOutputVisitor *mo = qmp_output_visitor_new();
QapiDeallocVisitor *md;
Visitor *v;
v = qmp_output_get_visitor(mo);
- visit_type_UserDefOne(v, &ret_in, "unused", errp);
- if (!error_is_set(errp)) {
- *ret_out = qmp_output_get_qobject(mo);
+ visit_type_UserDefOne(v, &ret_in, "unused", &local_err);
+ if (local_err) {
+ goto out;
}
+ *ret_out = qmp_output_get_qobject(mo);
+
+ out:
+ error_propagate(errp, local_err);
qmp_output_visitor_cleanup(mo);
md = qapi_dealloc_visitor_new();
v = qapi_dealloc_get_visitor(md);
@@ -417,6 +426,7 @@ Example:
static void qmp_marshal_input_my_command(QDict *args, QObject **ret, Error **errp)
{
+ Error *local_err = NULL;
UserDefOne * retval = NULL;
QmpInputVisitor *mi = qmp_input_visitor_new_strict(QOBJECT(args));
QapiDeallocVisitor *md;
@@ -424,17 +434,20 @@ Example:
UserDefOne * arg1 = NULL;
v = qmp_input_get_visitor(mi);
- visit_type_UserDefOne(v, &arg1, "arg1", errp);
-
- if (error_is_set(errp)) {
+ visit_type_UserDefOne(v, &arg1, "arg1", &local_err);
+ if (local_err) {
goto out;
}
- retval = qmp_my_command(arg1, errp);
- if (!error_is_set(errp)) {
- qmp_marshal_output_my_command(retval, ret, errp);
+
+ retval = qmp_my_command(arg1, &local_err);
+ if (local_err) {
+ goto out;
}
+ qmp_marshal_output_my_command(retval, ret, &local_err);
+
out:
+ error_propagate(errp, local_err);
qmp_input_visitor_cleanup(mi);
md = qapi_dealloc_visitor_new();
v = qapi_dealloc_get_visitor(md);
@@ -804,13 +804,33 @@ static void rtc_get_date(Object *obj, Visitor *v, void *opaque,
goto out;
}
visit_type_int32(v, ¤t_tm.tm_year, "tm_year", &err);
+ if (err) {
+ goto out_end;
+ }
visit_type_int32(v, ¤t_tm.tm_mon, "tm_mon", &err);
+ if (err) {
+ goto out_end;
+ }
visit_type_int32(v, ¤t_tm.tm_mday, "tm_mday", &err);
+ if (err) {
+ goto out_end;
+ }
visit_type_int32(v, ¤t_tm.tm_hour, "tm_hour", &err);
+ if (err) {
+ goto out_end;
+ }
visit_type_int32(v, ¤t_tm.tm_min, "tm_min", &err);
+ if (err) {
+ goto out_end;
+ }
visit_type_int32(v, ¤t_tm.tm_sec, "tm_sec", &err);
- visit_end_struct(v, &err);
-
+ if (err) {
+ goto out_end;
+ }
+out_end:
+ error_propagate(errp, err);
+ err = NULL;
+ visit_end_struct(v, errp);
out:
error_propagate(errp, err);
}
@@ -121,23 +121,27 @@ static void balloon_stats_get_all(Object *obj, struct Visitor *v,
if (err) {
goto out;
}
-
visit_type_int(v, &s->stats_last_update, "last-update", &err);
+ if (err) {
+ goto out_end;
+ }
visit_start_struct(v, NULL, NULL, "stats", 0, &err);
if (err) {
goto out_end;
}
-
- for (i = 0; i < VIRTIO_BALLOON_S_NR; i++) {
+ for (i = 0; err && i < VIRTIO_BALLOON_S_NR; i++) {
visit_type_int64(v, (int64_t *) &s->stats[i], balloon_stat_names[i],
&err);
}
+ error_propagate(errp, err);
+ err = NULL;
visit_end_struct(v, &err);
out_end:
+ error_propagate(errp, err);
+ err = NULL;
visit_end_struct(v, &err);
-
out:
error_propagate(errp, err);
}
@@ -20,28 +20,24 @@
void visit_start_struct(Visitor *v, void **obj, const char *kind,
const char *name, size_t size, Error **errp)
{
- if (!error_is_set(errp)) {
- v->start_struct(v, obj, kind, name, size, errp);
- }
+ v->start_struct(v, obj, kind, name, size, errp);
}
void visit_end_struct(Visitor *v, Error **errp)
{
- assert(!error_is_set(errp));
v->end_struct(v, errp);
}
void visit_start_implicit_struct(Visitor *v, void **obj, size_t size,
Error **errp)
{
- if (!error_is_set(errp) && v->start_implicit_struct) {
+ if (v->start_implicit_struct) {
v->start_implicit_struct(v, obj, size, errp);
}
}
void visit_end_implicit_struct(Visitor *v, Error **errp)
{
- assert(!error_is_set(errp));
if (v->end_implicit_struct) {
v->end_implicit_struct(v, errp);
}
@@ -49,30 +45,23 @@ void visit_end_implicit_struct(Visitor *v, Error **errp)
void visit_start_list(Visitor *v, const char *name, Error **errp)
{
- if (!error_is_set(errp)) {
- v->start_list(v, name, errp);
- }
+ v->start_list(v, name, errp);
}
GenericList *visit_next_list(Visitor *v, GenericList **list, Error **errp)
{
- if (!error_is_set(errp)) {
- return v->next_list(v, list, errp);
- }
-
- return 0;
+ return v->next_list(v, list, errp);
}
void visit_end_list(Visitor *v, Error **errp)
{
- assert(!error_is_set(errp));
v->end_list(v, errp);
}
void visit_optional(Visitor *v, bool *present, const char *name,
Error **errp)
{
- if (!error_is_set(errp) && v->optional) {
+ if (v->optional) {
v->optional(v, present, name, errp);
}
}
@@ -80,7 +69,7 @@ void visit_optional(Visitor *v, bool *present, const char *name,
void visit_get_next_type(Visitor *v, int *obj, const int *qtypes,
const char *name, Error **errp)
{
- if (!error_is_set(errp) && v->get_next_type) {
+ if (v->get_next_type) {
v->get_next_type(v, obj, qtypes, name, errp);
}
}
@@ -88,192 +77,172 @@ void visit_get_next_type(Visitor *v, int *obj, const int *qtypes,
void visit_type_enum(Visitor *v, int *obj, const char *strings[],
const char *kind, const char *name, Error **errp)
{
- if (!error_is_set(errp)) {
- v->type_enum(v, obj, strings, kind, name, errp);
- }
+ v->type_enum(v, obj, strings, kind, name, errp);
}
void visit_type_int(Visitor *v, int64_t *obj, const char *name, Error **errp)
{
- if (!error_is_set(errp)) {
- v->type_int(v, obj, name, errp);
- }
+ v->type_int(v, obj, name, errp);
}
void visit_type_uint8(Visitor *v, uint8_t *obj, const char *name, Error **errp)
{
int64_t value;
- if (!error_is_set(errp)) {
- if (v->type_uint8) {
- v->type_uint8(v, obj, name, errp);
- } else {
- value = *obj;
- v->type_int(v, &value, name, errp);
- if (value < 0 || value > UINT8_MAX) {
- error_set(errp, QERR_INVALID_PARAMETER_VALUE, name ? name : "null",
- "uint8_t");
- return;
- }
- *obj = value;
+
+ if (v->type_uint8) {
+ v->type_uint8(v, obj, name, errp);
+ } else {
+ value = *obj;
+ v->type_int(v, &value, name, errp);
+ if (value < 0 || value > UINT8_MAX) {
+ error_set(errp, QERR_INVALID_PARAMETER_VALUE, name ? name : "null",
+ "uint8_t");
+ return;
}
+ *obj = value;
}
}
void visit_type_uint16(Visitor *v, uint16_t *obj, const char *name, Error **errp)
{
int64_t value;
- if (!error_is_set(errp)) {
- if (v->type_uint16) {
- v->type_uint16(v, obj, name, errp);
- } else {
- value = *obj;
- v->type_int(v, &value, name, errp);
- if (value < 0 || value > UINT16_MAX) {
- error_set(errp, QERR_INVALID_PARAMETER_VALUE, name ? name : "null",
- "uint16_t");
- return;
- }
- *obj = value;
+
+ if (v->type_uint16) {
+ v->type_uint16(v, obj, name, errp);
+ } else {
+ value = *obj;
+ v->type_int(v, &value, name, errp);
+ if (value < 0 || value > UINT16_MAX) {
+ error_set(errp, QERR_INVALID_PARAMETER_VALUE, name ? name : "null",
+ "uint16_t");
+ return;
}
+ *obj = value;
}
}
void visit_type_uint32(Visitor *v, uint32_t *obj, const char *name, Error **errp)
{
int64_t value;
- if (!error_is_set(errp)) {
- if (v->type_uint32) {
- v->type_uint32(v, obj, name, errp);
- } else {
- value = *obj;
- v->type_int(v, &value, name, errp);
- if (value < 0 || value > UINT32_MAX) {
- error_set(errp, QERR_INVALID_PARAMETER_VALUE, name ? name : "null",
- "uint32_t");
- return;
- }
- *obj = value;
+
+ if (v->type_uint32) {
+ v->type_uint32(v, obj, name, errp);
+ } else {
+ value = *obj;
+ v->type_int(v, &value, name, errp);
+ if (value < 0 || value > UINT32_MAX) {
+ error_set(errp, QERR_INVALID_PARAMETER_VALUE, name ? name : "null",
+ "uint32_t");
+ return;
}
+ *obj = value;
}
}
void visit_type_uint64(Visitor *v, uint64_t *obj, const char *name, Error **errp)
{
int64_t value;
- if (!error_is_set(errp)) {
- if (v->type_uint64) {
- v->type_uint64(v, obj, name, errp);
- } else {
- value = *obj;
- v->type_int(v, &value, name, errp);
- *obj = value;
- }
+
+ if (v->type_uint64) {
+ v->type_uint64(v, obj, name, errp);
+ } else {
+ value = *obj;
+ v->type_int(v, &value, name, errp);
+ *obj = value;
}
}
void visit_type_int8(Visitor *v, int8_t *obj, const char *name, Error **errp)
{
int64_t value;
- if (!error_is_set(errp)) {
- if (v->type_int8) {
- v->type_int8(v, obj, name, errp);
- } else {
- value = *obj;
- v->type_int(v, &value, name, errp);
- if (value < INT8_MIN || value > INT8_MAX) {
- error_set(errp, QERR_INVALID_PARAMETER_VALUE, name ? name : "null",
- "int8_t");
- return;
- }
- *obj = value;
+
+ if (v->type_int8) {
+ v->type_int8(v, obj, name, errp);
+ } else {
+ value = *obj;
+ v->type_int(v, &value, name, errp);
+ if (value < INT8_MIN || value > INT8_MAX) {
+ error_set(errp, QERR_INVALID_PARAMETER_VALUE, name ? name : "null",
+ "int8_t");
+ return;
}
+ *obj = value;
}
}
void visit_type_int16(Visitor *v, int16_t *obj, const char *name, Error **errp)
{
int64_t value;
- if (!error_is_set(errp)) {
- if (v->type_int16) {
- v->type_int16(v, obj, name, errp);
- } else {
- value = *obj;
- v->type_int(v, &value, name, errp);
- if (value < INT16_MIN || value > INT16_MAX) {
- error_set(errp, QERR_INVALID_PARAMETER_VALUE, name ? name : "null",
- "int16_t");
- return;
- }
- *obj = value;
+
+ if (v->type_int16) {
+ v->type_int16(v, obj, name, errp);
+ } else {
+ value = *obj;
+ v->type_int(v, &value, name, errp);
+ if (value < INT16_MIN || value > INT16_MAX) {
+ error_set(errp, QERR_INVALID_PARAMETER_VALUE, name ? name : "null",
+ "int16_t");
+ return;
}
+ *obj = value;
}
}
void visit_type_int32(Visitor *v, int32_t *obj, const char *name, Error **errp)
{
int64_t value;
- if (!error_is_set(errp)) {
- if (v->type_int32) {
- v->type_int32(v, obj, name, errp);
- } else {
- value = *obj;
- v->type_int(v, &value, name, errp);
- if (value < INT32_MIN || value > INT32_MAX) {
- error_set(errp, QERR_INVALID_PARAMETER_VALUE, name ? name : "null",
- "int32_t");
- return;
- }
- *obj = value;
+
+ if (v->type_int32) {
+ v->type_int32(v, obj, name, errp);
+ } else {
+ value = *obj;
+ v->type_int(v, &value, name, errp);
+ if (value < INT32_MIN || value > INT32_MAX) {
+ error_set(errp, QERR_INVALID_PARAMETER_VALUE, name ? name : "null",
+ "int32_t");
+ return;
}
+ *obj = value;
}
}
void visit_type_int64(Visitor *v, int64_t *obj, const char *name, Error **errp)
{
- if (!error_is_set(errp)) {
- if (v->type_int64) {
- v->type_int64(v, obj, name, errp);
- } else {
- v->type_int(v, obj, name, errp);
- }
+ if (v->type_int64) {
+ v->type_int64(v, obj, name, errp);
+ } else {
+ v->type_int(v, obj, name, errp);
}
}
void visit_type_size(Visitor *v, uint64_t *obj, const char *name, Error **errp)
{
int64_t value;
- if (!error_is_set(errp)) {
- if (v->type_size) {
- v->type_size(v, obj, name, errp);
- } else if (v->type_uint64) {
- v->type_uint64(v, obj, name, errp);
- } else {
- value = *obj;
- v->type_int(v, &value, name, errp);
- *obj = value;
- }
+
+ if (v->type_size) {
+ v->type_size(v, obj, name, errp);
+ } else if (v->type_uint64) {
+ v->type_uint64(v, obj, name, errp);
+ } else {
+ value = *obj;
+ v->type_int(v, &value, name, errp);
+ *obj = value;
}
}
void visit_type_bool(Visitor *v, bool *obj, const char *name, Error **errp)
{
- if (!error_is_set(errp)) {
- v->type_bool(v, obj, name, errp);
- }
+ v->type_bool(v, obj, name, errp);
}
void visit_type_str(Visitor *v, char **obj, const char *name, Error **errp)
{
- if (!error_is_set(errp)) {
- v->type_str(v, obj, name, errp);
- }
+ v->type_str(v, obj, name, errp);
}
void visit_type_number(Visitor *v, double *obj, const char *name, Error **errp)
{
- if (!error_is_set(errp)) {
- v->type_number(v, obj, name, errp);
- }
+ v->type_number(v, obj, name, errp);
}
void output_type_enum(Visitor *v, int *obj, const char *strings[],
@@ -299,13 +268,15 @@ void input_type_enum(Visitor *v, int *obj, const char *strings[],
const char *kind, const char *name,
Error **errp)
{
+ Error *local_err = NULL;
int64_t value = 0;
char *enum_str;
assert(strings);
- visit_type_str(v, &enum_str, name, errp);
- if (error_is_set(errp)) {
+ visit_type_str(v, &enum_str, name, &local_err);
+ if (local_err) {
+ error_propagate(errp, local_err);
return;
}
@@ -12,6 +12,7 @@
from ordereddict import OrderedDict
from qapi import *
+import re
import sys
import os
import getopt
@@ -37,6 +38,15 @@ def generate_command_decl(name, args, ret_type):
''',
ret_type=c_type(ret_type), name=c_fun(name), args=arglist).strip()
+def gen_err_check(errvar):
+ if errvar:
+ return mcgen('''
+if (local_err) {
+ goto out;
+}
+''')
+ return ''
+
def gen_sync_call(name, args, ret_type, indent=0):
ret = ""
arglist=""
@@ -49,15 +59,14 @@ def gen_sync_call(name, args, ret_type, indent=0):
arglist += "%s, " % (c_var(argname))
push_indent(indent)
ret = mcgen('''
-%(retval)sqmp_%(name)s(%(args)serrp);
+%(retval)sqmp_%(name)s(%(args)s&local_err);
''',
name=c_fun(name), args=arglist, retval=retval).rstrip()
if ret_type:
+ ret += "\n" + gen_err_check('local_err')
ret += "\n" + mcgen(''''
-if (!error_is_set(errp)) {
- %(marshal_output_call)s
-}
+%(marshal_output_call)s
''',
marshal_output_call=gen_marshal_output_call(name, ret_type)).rstrip()
pop_indent(indent)
@@ -67,7 +76,7 @@ if (!error_is_set(errp)) {
def gen_marshal_output_call(name, ret_type):
if not ret_type:
return ""
- return "qmp_marshal_output_%s(retval, ret, errp);" % c_fun(name)
+ return "qmp_marshal_output_%s(retval, ret, &local_err);" % c_fun(name)
def gen_visitor_input_containers_decl(args, obj):
ret = ""
@@ -109,7 +118,8 @@ bool has_%(argname)s = false;
def gen_visitor_input_block(args, dealloc=False):
ret = ""
- errparg = 'errp'
+ errparg = '&local_err'
+ errarg = 'local_err'
if len(args) == 0:
return ret
@@ -118,6 +128,7 @@ def gen_visitor_input_block(args, dealloc=False):
if dealloc:
errparg = 'NULL'
+ errarg = None;
ret += mcgen('''
qmp_input_visitor_cleanup(mi);
md = qapi_dealloc_visitor_new();
@@ -132,15 +143,20 @@ v = qmp_input_get_visitor(mi);
if optional:
ret += mcgen('''
visit_optional(v, &has_%(c_name)s, "%(name)s", %(errp)s);
-if (has_%(c_name)s) {
''',
c_name=c_var(argname), name=argname, errp=errparg)
+ ret += gen_err_check(errarg)
+ ret += mcgen('''
+if (has_%(c_name)s) {
+''',
+ c_name=c_var(argname))
push_indent()
ret += mcgen('''
%(visitor)s(v, &%(c_name)s, "%(name)s", %(errp)s);
''',
c_name=c_var(argname), name=argname, argtype=argtype,
visitor=type_visitor(argtype), errp=errparg)
+ ret += gen_err_check(errarg)
if optional:
pop_indent()
ret += mcgen('''
@@ -161,15 +177,20 @@ def gen_marshal_output(name, args, ret_type, middle_mode):
ret = mcgen('''
static void qmp_marshal_output_%(c_name)s(%(c_ret_type)s ret_in, QObject **ret_out, Error **errp)
{
+ Error *local_err = NULL;
QmpOutputVisitor *mo = qmp_output_visitor_new();
QapiDeallocVisitor *md;
Visitor *v;
v = qmp_output_get_visitor(mo);
- %(visitor)s(v, &ret_in, "unused", errp);
- if (!error_is_set(errp)) {
- *ret_out = qmp_output_get_qobject(mo);
+ %(visitor)s(v, &ret_in, "unused", &local_err);
+ if (local_err) {
+ goto out;
}
+ *ret_out = qmp_output_get_qobject(mo);
+
+out:
+ error_propagate(errp, local_err);
qmp_output_visitor_cleanup(mo);
md = qapi_dealloc_visitor_new();
v = qapi_dealloc_get_visitor(md);
@@ -196,13 +217,12 @@ def gen_marshal_input(name, args, ret_type, middle_mode):
ret = mcgen('''
%(header)s
{
+ Error *local_err = NULL;
''',
header=hdr)
if middle_mode:
ret += mcgen('''
- Error *local_err = NULL;
- Error **errp = &local_err;
QDict *args = (QDict *)qdict;
''')
@@ -229,20 +249,23 @@ def gen_marshal_input(name, args, ret_type, middle_mode):
visitor_input_block=gen_visitor_input_block(args))
else:
ret += mcgen('''
+
(void)args;
''')
ret += mcgen('''
- if (error_is_set(errp)) {
- goto out;
- }
%(sync_call)s
''',
sync_call=gen_sync_call(name, args, ret_type, indent=4))
- ret += mcgen('''
+ if re.search('^ *goto out\\;', ret, re.MULTILINE):
+ ret += mcgen('''
out:
''')
+ if not middle_mode:
+ ret += mcgen('''
+ error_propagate(errp, local_err);
+''')
ret += mcgen('''
%(visitor_input_block_cleanup)s
''',
@@ -12,6 +12,7 @@
from ordereddict import OrderedDict
from qapi import *
+import re
import sys
import os
import getopt
@@ -32,9 +33,7 @@ static void visit_type_implicit_%(c_type)s(Visitor *m, %(c_type)s **obj, Error *
visit_start_implicit_struct(m, (void **)obj, sizeof(%(c_type)s), &err);
if (!err) {
- visit_type_%(c_type)s_fields(m, obj, &err);
- error_propagate(errp, err);
- err = NULL;
+ visit_type_%(c_type)s_fields(m, obj, errp);
visit_end_implicit_struct(m, &err);
}
error_propagate(errp, err);
@@ -64,12 +63,9 @@ def generate_visit_struct_fields(name, field_prefix, fn_prefix, members, base =
static void visit_type_%(full_name)s_field_%(c_name)s(Visitor *m, %(name)s **obj, Error **errp)
{
- Error *err = NULL;
''',
name=name, full_name=full_name, c_name=c_var(argname))
- push_indent()
ret += generate_visit_struct_body(full_name, argname, argentry)
- pop_indent()
ret += mcgen('''
}
''')
@@ -89,6 +85,9 @@ static void visit_type_%(full_name)s_fields(Visitor *m, %(name)s ** obj, Error *
if base:
ret += mcgen('''
visit_type_implicit_%(type)s(m, &(*obj)->%(c_prefix)s%(c_name)s, &err);
+if (err) {
+ goto out;
+}
''',
c_prefix=c_var(field_prefix),
type=type_name(base), c_name=c_var('base'))
@@ -97,7 +96,7 @@ visit_type_implicit_%(type)s(m, &(*obj)->%(c_prefix)s%(c_name)s, &err);
if optional:
ret += mcgen('''
visit_optional(m, &(*obj)->%(c_prefix)shas_%(c_name)s, "%(name)s", &err);
-if ((*obj)->%(prefix)shas_%(c_name)s) {
+if (!err && (*obj)->%(prefix)shas_%(c_name)s) {
''',
c_prefix=c_var(field_prefix), prefix=field_prefix,
c_name=c_var(argname), name=argname)
@@ -121,10 +120,19 @@ visit_type_%(type)s(m, &(*obj)->%(c_prefix)s%(c_name)s, "%(name)s", &err);
ret += mcgen('''
}
''')
+ ret += mcgen('''
+if (err) {
+ goto out;
+}
+''')
pop_indent()
- ret += mcgen('''
+ if re.search('^ *goto out\\;', ret, re.MULTILINE):
+ ret += mcgen('''
+out:
+''')
+ ret += mcgen('''
error_propagate(errp, err);
}
''')
@@ -133,9 +141,9 @@ visit_type_%(type)s(m, &(*obj)->%(c_prefix)s%(c_name)s, "%(name)s", &err);
def generate_visit_struct_body(field_prefix, name, members):
ret = mcgen('''
-if (!error_is_set(errp)) {
+ Error *err = NULL;
+
''')
- push_indent()
if not field_prefix:
full_name = name
@@ -144,36 +152,26 @@ if (!error_is_set(errp)) {
if len(field_prefix):
ret += mcgen('''
-visit_start_struct(m, NULL, "", "%(name)s", 0, &err);
+ visit_start_struct(m, NULL, "", "%(name)s", 0, &err);
''',
name=name)
else:
ret += mcgen('''
-Error *err = NULL;
-visit_start_struct(m, (void **)obj, "%(name)s", name, sizeof(%(name)s), &err);
+ visit_start_struct(m, (void **)obj, "%(name)s", name, sizeof(%(name)s), &err);
''',
name=name)
ret += mcgen('''
-if (!err) {
- if (*obj) {
- visit_type_%(name)s_fields(m, obj, &err);
- error_propagate(errp, err);
- err = NULL;
+ if (!err) {
+ if (*obj) {
+ visit_type_%(name)s_fields(m, obj, errp);
+ }
+ visit_end_struct(m, &err);
}
+ error_propagate(errp, err);
''',
name=full_name)
- ret += mcgen('''
- /* Always call end_struct if start_struct succeeded. */
- visit_end_struct(m, &err);
-}
-error_propagate(errp, err);
-''')
- pop_indent()
- ret += mcgen('''
-}
-''')
return ret
def generate_visit_struct(expr):
@@ -191,9 +189,7 @@ void visit_type_%(name)s(Visitor *m, %(name)s ** obj, const char *name, Error **
''',
name=name)
- push_indent()
ret += generate_visit_struct_body("", name, members)
- pop_indent()
ret += mcgen('''
}
@@ -205,24 +201,26 @@ def generate_visit_list(name, members):
void visit_type_%(name)sList(Visitor *m, %(name)sList ** obj, const char *name, Error **errp)
{
- GenericList *i, **prev = (GenericList **)obj;
Error *err = NULL;
+ GenericList *i, **prev;
- if (!error_is_set(errp)) {
- visit_start_list(m, name, &err);
- if (!err) {
- for (; (i = visit_next_list(m, prev, &err)) != NULL; prev = &i) {
- %(name)sList *native_i = (%(name)sList *)i;
- visit_type_%(name)s(m, &native_i->value, NULL, &err);
- }
- error_propagate(errp, err);
- err = NULL;
-
- /* Always call end_list if start_list succeeded. */
- visit_end_list(m, &err);
- }
- error_propagate(errp, err);
+ visit_start_list(m, name, &err);
+ if (err) {
+ goto out;
+ }
+
+ for (prev = (GenericList **)obj;
+ !err && (i = visit_next_list(m, prev, &err)) != NULL;
+ prev = &i) {
+ %(name)sList *native_i = (%(name)sList *)i;
+ visit_type_%(name)s(m, &native_i->value, NULL, &err);
}
+
+ error_propagate(errp, err);
+ err = NULL;
+ visit_end_list(m, &err);
+out:
+ error_propagate(errp, err);
}
''',
name=name)
@@ -244,10 +242,15 @@ void visit_type_%(name)s(Visitor *m, %(name)s ** obj, const char *name, Error **
{
Error *err = NULL;
- if (!error_is_set(errp)) {
- visit_start_implicit_struct(m, (void**) obj, sizeof(%(name)s), &err);
- visit_get_next_type(m, (int*) &(*obj)->kind, %(name)s_qtypes, name, &err);
- switch ((*obj)->kind) {
+ visit_start_implicit_struct(m, (void**) obj, sizeof(%(name)s), &err);
+ if (err) {
+ goto out;
+ }
+ visit_get_next_type(m, (int*) &(*obj)->kind, %(name)s_qtypes, name, &err);
+ if (err) {
+ goto out_end;
+ }
+ switch ((*obj)->kind) {
''',
name=name)
@@ -262,22 +265,24 @@ void visit_type_%(name)s(Visitor *m, %(name)s ** obj, const char *name, Error **
enum_full_value = generate_enum_full_value(disc_type, key)
ret += mcgen('''
- case %(enum_full_value)s:
- visit_type_%(c_type)s(m, &(*obj)->%(c_name)s, name, &err);
- break;
+ case %(enum_full_value)s:
+ visit_type_%(c_type)s(m, &(*obj)->%(c_name)s, name, &err);
+ break;
''',
enum_full_value = enum_full_value,
c_type = type_name(members[key]),
c_name = c_fun(key))
ret += mcgen('''
- default:
- abort();
- }
- error_propagate(errp, err);
- err = NULL;
- visit_end_implicit_struct(m, &err);
+ default:
+ abort();
}
+out_end:
+ error_propagate(errp, err);
+ err = NULL;
+ visit_end_implicit_struct(m, &err);
+out:
+ error_propagate(errp, err);
}
''')
@@ -324,19 +329,20 @@ void visit_type_%(name)s(Visitor *m, %(name)s ** obj, const char *name, Error **
{
Error *err = NULL;
- if (!error_is_set(errp)) {
- visit_start_struct(m, (void **)obj, "%(name)s", name, sizeof(%(name)s), &err);
- if (!err) {
- if (*obj) {
+ visit_start_struct(m, (void **)obj, "%(name)s", name, sizeof(%(name)s), &err);
+ if (err) {
+ goto out;
+ }
+ if (*obj) {
''',
name=name)
- push_indent()
- push_indent()
-
if base:
ret += mcgen('''
visit_type_%(name)s_fields(m, obj, &err);
+ if (err) {
+ goto out_obj;
+ }
''',
name=name)
@@ -346,8 +352,10 @@ void visit_type_%(name)s(Visitor *m, %(name)s ** obj, const char *name, Error **
disc_key = discriminator
ret += mcgen('''
visit_type_%(disc_type)s(m, &(*obj)->kind, "%(disc_key)s", &err);
- if (!err) {
- switch ((*obj)->kind) {
+ if (err) {
+ goto out_obj;
+ }
+ switch ((*obj)->kind) {
''',
disc_type = disc_type,
disc_key = disc_key)
@@ -360,32 +368,25 @@ void visit_type_%(name)s(Visitor *m, %(name)s ** obj, const char *name, Error **
enum_full_value = generate_enum_full_value(disc_type, key)
ret += mcgen('''
- case %(enum_full_value)s:
- ''' + fmt + '''
- break;
+ case %(enum_full_value)s:
+ ''' + fmt + '''
+ break;
''',
enum_full_value = enum_full_value,
c_type=type_name(members[key]),
c_name=c_fun(key))
ret += mcgen('''
- default:
- abort();
- }
+ default:
+ abort();
}
+out_obj:
error_propagate(errp, err);
err = NULL;
-''')
- pop_indent()
- pop_indent()
-
- ret += mcgen('''
- }
- /* Always call end_struct if start_struct succeeded. */
- visit_end_struct(m, &err);
- }
- error_propagate(errp, err);
}
+ visit_end_struct(m, &err);
+out:
+ error_propagate(errp, err);
}
''')
@@ -502,7 +503,7 @@ fdecl.write(mcgen('''
/* THIS FILE IS AUTOMATICALLY GENERATED, DO NOT MODIFY */
/*
- * schema-defined QAPI visitor function
+ * schema-defined QAPI visitor functions
*
* Copyright IBM, Corp. 2011
*
@@ -81,11 +81,19 @@ static void visit_type_TestStruct(Visitor *v, TestStruct **obj,
}
visit_type_int(v, &(*obj)->integer, "integer", &err);
+ if (err) {
+ goto out_end;
+ }
visit_type_bool(v, &(*obj)->boolean, "boolean", &err);
+ if (err) {
+ goto out_end;
+ }
visit_type_str(v, &(*obj)->string, "string", &err);
+out_end:
+ error_propagate(errp, err);
+ err = NULL;
visit_end_struct(v, &err);
-
out:
error_propagate(errp, err);
}
@@ -199,16 +199,24 @@ static void visit_type_TestStruct(Visitor *v, TestStruct **obj,
visit_start_struct(v, (void **)obj, "TestStruct", name, sizeof(TestStruct),
&err);
- if (!err) {
- visit_type_int(v, &(*obj)->integer, "integer", &err);
- visit_type_bool(v, &(*obj)->boolean, "boolean", &err);
- visit_type_str(v, &(*obj)->string, "string", &err);
-
- /* Always call end_struct if start_struct succeeded. */
- error_propagate(errp, err);
- err = NULL;
- visit_end_struct(v, &err);
+ if (err) {
+ goto out;
}
+ visit_type_int(v, &(*obj)->integer, "integer", &err);
+ if (err) {
+ goto out_end;
+ }
+ visit_type_bool(v, &(*obj)->boolean, "boolean", &err);
+ if (err) {
+ goto out_end;
+ }
+ visit_type_str(v, &(*obj)->string, "string", &err);
+
+out_end:
+ error_propagate(errp, err);
+ err = NULL;
+ visit_end_struct(v, &err);
+out:
error_propagate(errp, err);
}
@@ -185,11 +185,19 @@ static void visit_type_TestStruct(Visitor *v, TestStruct **obj,
}
visit_type_int(v, &(*obj)->integer, "integer", &err);
+ if (err) {
+ goto out_end;
+ }
visit_type_bool(v, &(*obj)->boolean, "boolean", &err);
+ if (err) {
+ goto out_end;
+ }
visit_type_str(v, &(*obj)->string, "string", &err);
+out_end:
+ error_propagate(errp, err);
+ err = NULL;
visit_end_struct(v, &err);
-
out:
error_propagate(errp, err);
}
@@ -195,7 +195,7 @@ typedef struct TestStruct
static void visit_type_TestStruct(Visitor *v, TestStruct **obj,
const char *name, Error **errp)
{
- Error *err= NULL;
+ Error *err = NULL;
visit_start_struct(v, (void **)obj, NULL, name, sizeof(TestStruct), &err);
if (err) {
@@ -203,11 +203,19 @@ static void visit_type_TestStruct(Visitor *v, TestStruct **obj,
}
visit_type_int(v, &(*obj)->integer, "integer", &err);
+ if (err) {
+ goto out_end;
+ }
visit_type_bool(v, &(*obj)->boolean, "boolean", &err);
+ if (err) {
+ goto out_end;
+ }
visit_type_str(v, &(*obj)->string, "string", &err);
+out_end:
+ error_propagate(errp, err);
+ err = NULL;
visit_end_struct(v, &err);
-
out:
error_propagate(errp, err);
}
We commonly use the error API like this: err = NULL; foo(..., &err); if (err) { goto out; } bar(..., &err); Every error source is checked separately. The second function is only called when the first one succeeds. Both functions are free to pass their argument to error_set(). Because error_set() asserts no error has been set, this effectively means they must not be called with an error set. The qapi-generated code uses the error API differently: // *errp was initialized to NULL somewhere up the call chain frob(..., errp); gnat(..., errp); Errors accumulate in *errp: first error wins, subsequent errors get dropped. To make this work, the second function does nothing when called with an error set. Requires non-null errp, or else the second function can't see the first one fail. This usage has also bled into visitor tests, and two device model object property getters rtc_get_date() and balloon_stats_get_all(). With the "accumulate" technique, you need fewer error checks in callers, and buy that with an error check in every callee. Can be nice. However, mixing the two techniques is confusing. You can't use the "accumulate" technique with functions designed for the "check separately" technique. You can use the "check separately" technique with functions designed for the "accumulate" technique, but then error_set() can't catch you setting an error more than once. Standardize on the "check separately" technique for now, because it's overwhelmingly prevalent. Signed-off-by: Markus Armbruster <armbru@redhat.com> --- docs/qapi-code-gen.txt | 87 ++++++++------ hw/timer/mc146818rtc.c | 24 +++- hw/virtio/virtio-balloon.c | 12 +- qapi/qapi-visit-core.c | 231 ++++++++++++++++--------------------- scripts/qapi-commands.py | 55 ++++++--- scripts/qapi-visit.py | 169 +++++++++++++-------------- tests/test-qmp-input-strict.c | 10 +- tests/test-qmp-input-visitor.c | 26 +++-- tests/test-qmp-output-visitor.c | 10 +- tests/test-visitor-serialization.c | 12 +- 10 files changed, 350 insertions(+), 286 deletions(-)