qapi: Remove visit_start_alternate() parameter promote_int

Before the previous commit, parameter promote_int = true made
visit_start_alternate() with an input visitor avoid QTYPE_QINT
variants and create QTYPE_QFLOAT variants instead. This was used
where QTYPE_QINT variants were invalid.

The previous commit fused QTYPE_QINT with QTYPE_QFLOAT, rendering
promote_int useless and unused.

Backports commit 60390d2dc85ffade8981ca41e02335cb07353a6d from qemu

qemu/include/qapi/visitor-impl.h

@@ -72,7 +72,7 @@ struct Visitor
      * optional for output visitors. */
     void (*start_alternate)(Visitor *v, const char *name,
                             GenericAlternate **obj, size_t size,
-                            bool promote_int, Error **errp);
+                            Error **errp);
 
     /* Optional, needed for dealloc visitor */
     void (*end_alternate)(Visitor *v, void **obj);

qemu/include/qapi/visitor.h

@@ -415,15 +415,13 @@ void visit_end_list(Visitor *v, void **list);
  * the qtype of the next thing to be visited, stored in (*@obj)->type.
  * Other visitors will leave @obj unchanged.
  *
- * If @promote_int, treat integers as QTYPE_FLOAT.
- *
  * If successful, this must be paired with visit_end_alternate() with
  * the same @obj to clean up, even if visiting the contents of the
  * alternate fails.
  */
 void visit_start_alternate(Visitor *v, const char *name,
                            GenericAlternate **obj, size_t size,
-                           bool promote_int, Error **errp);
+                           Error **errp);
 
 /*
  * Finish visiting an alternate type.

qemu/qapi/qapi-clone-visitor.c

@@ -70,7 +70,7 @@ static GenericList *qapi_clone_next_list(Visitor *v, GenericList *tail,
 
 static void qapi_clone_start_alternate(Visitor *v, const char *name,
                                        GenericAlternate **obj, size_t size,
-                                       bool promote_int, Error **errp)
+                                       Error **errp)
 {
     qapi_clone_start_struct(v, name, (void **)obj, size, errp);
 }

qemu/qapi/qapi-dealloc-visitor.c

@@ -39,7 +39,7 @@ static void qapi_dealloc_end_struct(Visitor *v, void **obj)
 
 static void qapi_dealloc_start_alternate(Visitor *v, const char *name,
                                          GenericAlternate **obj, size_t size,
-                                         bool promote_int, Error **errp)
+                                         Error **errp)
 {
 }
 

qemu/qapi/qapi-visit-core.c

@@ -99,12 +99,12 @@ void visit_end_list(Visitor *v, void **obj)
 
 void visit_start_alternate(Visitor *v, const char *name,
                            GenericAlternate **obj, size_t size,
-                           bool promote_int, Error **errp)
+                           Error **errp)
 {
     assert(obj && size >= sizeof(GenericAlternate));
     assert(!(v->type & VISITOR_OUTPUT) || *obj);
     if (v->start_alternate) {
-        v->start_alternate(v, name, obj, size, promote_int, errp);
+        v->start_alternate(v, name, obj, size, errp);
     }
 }
 

qemu/qapi/qobject-input-visitor.c

@@ -325,7 +325,7 @@ static void qobject_input_end_list(Visitor *v, void **obj)
 
 static void qobject_input_start_alternate(Visitor *v, const char *name,
                                           GenericAlternate **obj, size_t size,
-                                          bool promote_int, Error **errp)
+                                          Error **errp)
 {
     QObjectInputVisitor *qiv = to_qiv(v);
     QObject *qobj = qobject_input_get_object(qiv, name, false, errp);

qemu/scripts/qapi-visit.py

@@ -161,20 +161,14 @@ void visit_type_%(c_name)s(Visitor *v, const char *name, %(c_name)s *obj, Error
 
 
 def gen_visit_alternate(name, variants):
-    promote_int = 'true'
+    ret = mcgen('''
-    ret = ''
-    for var in variants.variants:
-        if var.type.alternate_qtype() == 'QTYPE_QNUM':
-            promote_int = 'false'
-
-    ret += mcgen('''
 
 void visit_type_%(c_name)s(Visitor *v, const char *name, %(c_name)s **obj, Error **errp)
 {
     Error *err = NULL;
 
     visit_start_alternate(v, name, (GenericAlternate **)obj, sizeof(**obj),
-                          %(promote_int)s, &err);
+                          &err);
     if (err) {
         goto out;
     }
@@ -183,7 +177,7 @@ void visit_type_%(c_name)s(Visitor *v, const char *name, %(c_name)s **obj, Error
     }
     switch ((*obj)->type) {
 ''',
-                 c_name=c_name(name), promote_int=promote_int)
+                 c_name=c_name(name))
 
     for var in variants.variants:
         ret += mcgen('''