Eric Blake 32bafa8fdd qapi: Don't special-case simple union wrappers
Simple unions were carrying a special case that hid their 'data'
QMP member from the resulting C struct, via the hack method
QAPISchemaObjectTypeVariant.simple_union_type().  But by using
the work we started by unboxing flat union and alternate
branches, coupled with the ability to visit the members of an
implicit type, we can now expose the simple union's implicit
type in qapi-types.h:

| struct q_obj_ImageInfoSpecificQCow2_wrapper {
|     ImageInfoSpecificQCow2 *data;
| };
|
| struct q_obj_ImageInfoSpecificVmdk_wrapper {
|     ImageInfoSpecificVmdk *data;
| };
...
| struct ImageInfoSpecific {
|     ImageInfoSpecificKind type;
|     union { /* union tag is @type */
|         void *data;
|-        ImageInfoSpecificQCow2 *qcow2;
|-        ImageInfoSpecificVmdk *vmdk;
|+        q_obj_ImageInfoSpecificQCow2_wrapper qcow2;
|+        q_obj_ImageInfoSpecificVmdk_wrapper vmdk;
|     } u;
| };

Doing this removes asymmetry between QAPI's QMP side and its
C side (both sides now expose 'data'), and means that the
treatment of a simple union as sugar for a flat union is now
equivalent in both languages (previously the two approaches used
a different layer of dereferencing, where the simple union could
be converted to a flat union with equivalent C layout but
different {} on the wire, or to an equivalent QMP wire form
but with different C representation).  Using the implicit type
also lets us get rid of the simple_union_type() hack.

Of course, now all clients of simple unions have to adjust from
using su->u.member to using su->u.member.data; while this touches
a number of files in the tree, some earlier cleanup patches
helped minimize the change to the initialization of a temporary
variable rather than every single member access.  The generated
qapi-visit.c code is also affected by the layout change:

|@@ -7393,10 +7393,10 @@ void visit_type_ImageInfoSpecific_member
|     }
|     switch (obj->type) {
|     case IMAGE_INFO_SPECIFIC_KIND_QCOW2:
|-        visit_type_ImageInfoSpecificQCow2(v, "data", &obj->u.qcow2, &err);
|+        visit_type_q_obj_ImageInfoSpecificQCow2_wrapper_members(v, &obj->u.qcow2, &err);
|         break;
|     case IMAGE_INFO_SPECIFIC_KIND_VMDK:
|-        visit_type_ImageInfoSpecificVmdk(v, "data", &obj->u.vmdk, &err);
|+        visit_type_q_obj_ImageInfoSpecificVmdk_wrapper_members(v, &obj->u.vmdk, &err);
|         break;
|     default:
|         abort();

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <1458254921-17042-13-git-send-email-eblake@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
2016-03-18 10:29:26 +01:00

169 lines
4.5 KiB
C

/*
* replay-input.c
*
* Copyright (c) 2010-2015 Institute for System Programming
* of the Russian Academy of Sciences.
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "sysemu/replay.h"
#include "replay-internal.h"
#include "qemu/notify.h"
#include "ui/input.h"
#include "qapi/qmp-output-visitor.h"
#include "qapi/qmp-input-visitor.h"
#include "qapi-visit.h"
static InputEvent *qapi_clone_InputEvent(InputEvent *src)
{
QmpOutputVisitor *qov;
QmpInputVisitor *qiv;
Visitor *ov, *iv;
QObject *obj;
InputEvent *dst = NULL;
qov = qmp_output_visitor_new();
ov = qmp_output_get_visitor(qov);
visit_type_InputEvent(ov, NULL, &src, &error_abort);
obj = qmp_output_get_qobject(qov);
qmp_output_visitor_cleanup(qov);
if (!obj) {
return NULL;
}
qiv = qmp_input_visitor_new(obj);
iv = qmp_input_get_visitor(qiv);
visit_type_InputEvent(iv, NULL, &dst, &error_abort);
qmp_input_visitor_cleanup(qiv);
qobject_decref(obj);
return dst;
}
void replay_save_input_event(InputEvent *evt)
{
InputKeyEvent *key;
InputBtnEvent *btn;
InputMoveEvent *move;
replay_put_dword(evt->type);
switch (evt->type) {
case INPUT_EVENT_KIND_KEY:
key = evt->u.key.data;
replay_put_dword(key->key->type);
switch (key->key->type) {
case KEY_VALUE_KIND_NUMBER:
replay_put_qword(key->key->u.number.data);
replay_put_byte(key->down);
break;
case KEY_VALUE_KIND_QCODE:
replay_put_dword(key->key->u.qcode.data);
replay_put_byte(key->down);
break;
case KEY_VALUE_KIND__MAX:
/* keep gcc happy */
break;
}
break;
case INPUT_EVENT_KIND_BTN:
btn = evt->u.btn.data;
replay_put_dword(btn->button);
replay_put_byte(btn->down);
break;
case INPUT_EVENT_KIND_REL:
move = evt->u.rel.data;
replay_put_dword(move->axis);
replay_put_qword(move->value);
break;
case INPUT_EVENT_KIND_ABS:
move = evt->u.abs.data;
replay_put_dword(move->axis);
replay_put_qword(move->value);
break;
case INPUT_EVENT_KIND__MAX:
/* keep gcc happy */
break;
}
}
InputEvent *replay_read_input_event(void)
{
InputEvent evt;
KeyValue keyValue;
InputKeyEvent key;
key.key = &keyValue;
InputBtnEvent btn;
InputMoveEvent rel;
InputMoveEvent abs;
evt.type = replay_get_dword();
switch (evt.type) {
case INPUT_EVENT_KIND_KEY:
evt.u.key.data = &key;
evt.u.key.data->key->type = replay_get_dword();
switch (evt.u.key.data->key->type) {
case KEY_VALUE_KIND_NUMBER:
evt.u.key.data->key->u.number.data = replay_get_qword();
evt.u.key.data->down = replay_get_byte();
break;
case KEY_VALUE_KIND_QCODE:
evt.u.key.data->key->u.qcode.data = (QKeyCode)replay_get_dword();
evt.u.key.data->down = replay_get_byte();
break;
case KEY_VALUE_KIND__MAX:
/* keep gcc happy */
break;
}
break;
case INPUT_EVENT_KIND_BTN:
evt.u.btn.data = &btn;
evt.u.btn.data->button = (InputButton)replay_get_dword();
evt.u.btn.data->down = replay_get_byte();
break;
case INPUT_EVENT_KIND_REL:
evt.u.rel.data = &rel;
evt.u.rel.data->axis = (InputAxis)replay_get_dword();
evt.u.rel.data->value = replay_get_qword();
break;
case INPUT_EVENT_KIND_ABS:
evt.u.abs.data = &abs;
evt.u.abs.data->axis = (InputAxis)replay_get_dword();
evt.u.abs.data->value = replay_get_qword();
break;
case INPUT_EVENT_KIND__MAX:
/* keep gcc happy */
break;
}
return qapi_clone_InputEvent(&evt);
}
void replay_input_event(QemuConsole *src, InputEvent *evt)
{
if (replay_mode == REPLAY_MODE_PLAY) {
/* Nothing */
} else if (replay_mode == REPLAY_MODE_RECORD) {
replay_add_input_event(qapi_clone_InputEvent(evt));
} else {
qemu_input_event_send_impl(src, evt);
}
}
void replay_input_sync_event(void)
{
if (replay_mode == REPLAY_MODE_PLAY) {
/* Nothing */
} else if (replay_mode == REPLAY_MODE_RECORD) {
replay_add_input_sync_event();
} else {
qemu_input_event_sync_impl();
}
}