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>

1 files changed, 12 insertions, 12 deletions

diff --git a/tests/test-qmp-output-visitor.c b/tests/test-qmp-output-visitor.c
index a7f8b45c77..dc35752969 100644
--- a/tests/test-qmp-output-visitor.c
+++ b/tests/test-qmp-output-visitor.c
@@ -493,7 +493,7 @@ static void init_native_list(UserDefNativeListUnion *cvalue)
     int i;
     switch (cvalue->type) {
     case USER_DEF_NATIVE_LIST_UNION_KIND_INTEGER: {
-        intList **list = &cvalue->u.integer;
+        intList **list = &cvalue->u.integer.data;
         for (i = 0; i < 32; i++) {
             *list = g_new0(intList, 1);
             (*list)->value = i;
@@ -503,7 +503,7 @@ static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_S8: {
-        int8List **list = &cvalue->u.s8;
+        int8List **list = &cvalue->u.s8.data;
         for (i = 0; i < 32; i++) {
             *list = g_new0(int8List, 1);
             (*list)->value = i;
@@ -513,7 +513,7 @@ static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_S16: {
-        int16List **list = &cvalue->u.s16;
+        int16List **list = &cvalue->u.s16.data;
         for (i = 0; i < 32; i++) {
             *list = g_new0(int16List, 1);
             (*list)->value = i;
@@ -523,7 +523,7 @@ static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_S32: {
-        int32List **list = &cvalue->u.s32;
+        int32List **list = &cvalue->u.s32.data;
         for (i = 0; i < 32; i++) {
             *list = g_new0(int32List, 1);
             (*list)->value = i;
@@ -533,7 +533,7 @@ static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_S64: {
-        int64List **list = &cvalue->u.s64;
+        int64List **list = &cvalue->u.s64.data;
         for (i = 0; i < 32; i++) {
             *list = g_new0(int64List, 1);
             (*list)->value = i;
@@ -543,7 +543,7 @@ static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_U8: {
-        uint8List **list = &cvalue->u.u8;
+        uint8List **list = &cvalue->u.u8.data;
         for (i = 0; i < 32; i++) {
             *list = g_new0(uint8List, 1);
             (*list)->value = i;
@@ -553,7 +553,7 @@ static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_U16: {
-        uint16List **list = &cvalue->u.u16;
+        uint16List **list = &cvalue->u.u16.data;
         for (i = 0; i < 32; i++) {
             *list = g_new0(uint16List, 1);
             (*list)->value = i;
@@ -563,7 +563,7 @@ static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_U32: {
-        uint32List **list = &cvalue->u.u32;
+        uint32List **list = &cvalue->u.u32.data;
         for (i = 0; i < 32; i++) {
             *list = g_new0(uint32List, 1);
             (*list)->value = i;
@@ -573,7 +573,7 @@ static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_U64: {
-        uint64List **list = &cvalue->u.u64;
+        uint64List **list = &cvalue->u.u64.data;
         for (i = 0; i < 32; i++) {
             *list = g_new0(uint64List, 1);
             (*list)->value = i;
@@ -583,7 +583,7 @@ static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_BOOLEAN: {
-        boolList **list = &cvalue->u.boolean;
+        boolList **list = &cvalue->u.boolean.data;
         for (i = 0; i < 32; i++) {
             *list = g_new0(boolList, 1);
             (*list)->value = (i % 3 == 0);
@@ -593,7 +593,7 @@ static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_STRING: {
-        strList **list = &cvalue->u.string;
+        strList **list = &cvalue->u.string.data;
         for (i = 0; i < 32; i++) {
             *list = g_new0(strList, 1);
             (*list)->value = g_strdup_printf("%d", i);
@@ -603,7 +603,7 @@ static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_NUMBER: {
-        numberList **list = &cvalue->u.number;
+        numberList **list = &cvalue->u.number.data;
         for (i = 0; i < 32; i++) {
             *list = g_new0(numberList, 1);
             (*list)->value = (double)i / 3;