[Qemu-devel] [PATCH v5 20/46] qapi: Fix alternates that accept 'number' but not 'int'

[Eric Blake <eblake@redhat.com>]

The QMP input visitor allows integral values to be assigned by
promotion to a QTYPE_QFLOAT.  However, when parsing an alternate,
we did not take this into account, such that an alternate that
accepts 'number' but not 'int' would reject integral values.

With this patch, we now have the following desirable table:

    alternate has      case selected for
    'int'  'number'    QTYPE_QINT  QTYPE_QFLOAT
      no        no     error       error
      no       yes     'number'    'number'
     yes        no     'int'       error
     yes       yes     'int'       'number'

While it is unlikely that we will ever use 'number' in an
alternate other than in the testsuite, it never hurts to be
more precise in what we allow.

Signed-off-by: Eric Blake <eblake@redhat.com>
---
 include/qapi/visitor-impl.h    |  2 +-
 include/qapi/visitor.h         |  3 ++-
 qapi/qapi-visit-core.c         |  4 ++--
 qapi/qmp-input-visitor.c       |  4 ++++
 scripts/qapi-visit.py          |  9 +++++++--
 tests/test-qmp-input-visitor.c | 15 ++++++---------
 6 files changed, 22 insertions(+), 15 deletions(-)

diff --git a/include/qapi/visitor-impl.h b/include/qapi/visitor-impl.h
index 6d95b36..1d09b7b 100644
--- a/include/qapi/visitor-impl.h
+++ b/include/qapi/visitor-impl.h
@@ -33,7 +33,7 @@ struct Visitor
     void (*type_enum)(Visitor *v, int *obj, const char * const strings[],
                       const char *kind, const char *name, Error **errp);
     /* May be NULL; most useful for input visitors. */
-    void (*get_next_type)(Visitor *v, qtype_code *type,
+    void (*get_next_type)(Visitor *v, qtype_code *type, bool promote_int,
                           const char *name, Error **errp);

     void (*type_int)(Visitor *v, int64_t *obj, const char *name, Error **errp);
diff --git a/include/qapi/visitor.h b/include/qapi/visitor.h
index 088d3fc..1e73752 100644
--- a/include/qapi/visitor.h
+++ b/include/qapi/visitor.h
@@ -46,8 +46,9 @@ void visit_optional(Visitor *v, bool *present, const char *name,
  * Determine the qtype of the item @name in the current QDict visit.
  * For input visitors, set *@type to the correct qtype of a qapi
  * alternate type; for other visitors, leave *@type unchanged.
+ * If @promote_int, treat integers as QTYPE_FLOAT.
  */
-void visit_get_next_type(Visitor *v, qtype_code *type,
+void visit_get_next_type(Visitor *v, qtype_code *type, bool promote_int,
                          const char *name, Error **errp);
 void visit_type_enum(Visitor *v, int *obj, const char * const strings[],
                      const char *kind, const char *name, Error **errp);
diff --git a/qapi/qapi-visit-core.c b/qapi/qapi-visit-core.c
index 3f24daa..884fe94 100644
--- a/qapi/qapi-visit-core.c
+++ b/qapi/qapi-visit-core.c
@@ -81,11 +81,11 @@ void visit_optional(Visitor *v, bool *present, const char *name,
     }
 }

-void visit_get_next_type(Visitor *v, qtype_code *type,
+void visit_get_next_type(Visitor *v, qtype_code *type, bool promote_int,
                          const char *name, Error **errp)
 {
     if (v->get_next_type) {
-        v->get_next_type(v, type, name, errp);
+        v->get_next_type(v, type, promote_int, name, errp);
     }
 }

diff --git a/qapi/qmp-input-visitor.c b/qapi/qmp-input-visitor.c
index 803ffad..5310db5 100644
--- a/qapi/qmp-input-visitor.c
+++ b/qapi/qmp-input-visitor.c
@@ -209,6 +209,7 @@ static void qmp_input_end_list(Visitor *v, Error **errp)
 }

 static void qmp_input_get_next_type(Visitor *v, qtype_code *type,
+                                    bool promote_int,
                                     const char *name, Error **errp)
 {
     QmpInputVisitor *qiv = to_qiv(v);
@@ -219,6 +220,9 @@ static void qmp_input_get_next_type(Visitor *v, qtype_code *type,
         return;
     }
     *type = qobject_type(qobj);
+    if (promote_int && *type == QTYPE_QINT) {
+        *type = QTYPE_QFLOAT;
+    }
 }

 static void qmp_input_type_int(Visitor *v, int64_t *obj, const char *name,
diff --git a/scripts/qapi-visit.py b/scripts/qapi-visit.py
index e58c7f9..6ca7c7c 100644
--- a/scripts/qapi-visit.py
+++ b/scripts/qapi-visit.py
@@ -171,6 +171,11 @@ void visit_type_%(c_name)s(Visitor *v, %(c_name)s *obj, const char *name, Error


 def gen_visit_alternate(name, variants):
+    promote_int = 'true'
+    for var in variants.variants:
+        if var.type.alternate_qtype() == 'QTYPE_QINT':
+            promote_int = 'false'
+
     ret = mcgen('''

 void visit_type_%(c_name)s(Visitor *v, %(c_name)s **obj, const char *name, Error **errp)
@@ -181,13 +186,13 @@ void visit_type_%(c_name)s(Visitor *v, %(c_name)s **obj, const char *name, Error
     if (err) {
         goto out;
     }
-    visit_get_next_type(v, &(*obj)->type, name, &err);
+    visit_get_next_type(v, &(*obj)->type, %(promote_int)s, name, &err);
     if (err) {
         goto out_obj;
     }
     switch ((*obj)->type) {
 ''',
-                c_name=c_name(name))
+                c_name=c_name(name), promote_int=promote_int)

     for var in variants.variants:
         ret += mcgen('''
diff --git a/tests/test-qmp-input-visitor.c b/tests/test-qmp-input-visitor.c
index 69fa98f..54be9b4 100644
--- a/tests/test-qmp-input-visitor.c
+++ b/tests/test-qmp-input-visitor.c
@@ -415,20 +415,17 @@ static void test_visitor_in_alternate_number(TestInputVisitorData *data,
     qapi_free_AltOne(one);
     one = NULL;

-    /* FIXME: Integers should parse as numbers */
     v = visitor_input_test_init(data, "42");
-    visit_type_AltTwo(v, &two, NULL, &err);
-    g_assert(err);
-    error_free(err);
-    err = NULL;
+    visit_type_AltTwo(v, &two, NULL, &error_abort);
+    g_assert_cmpint(two->type, ==, QTYPE_QFLOAT);
+    g_assert_cmpfloat(two->n, ==, 42.0);
     qapi_free_AltTwo(two);
     one = NULL;

     v = visitor_input_test_init(data, "42");
-    visit_type_AltThree(v, &three, NULL, &err);
-    g_assert(err);
-    error_free(err);
-    err = NULL;
+    visit_type_AltThree(v, &three, NULL, &error_abort);
+    g_assert_cmpint(three->type, ==, QTYPE_QFLOAT);
+    g_assert_cmpfloat(three->n, ==, 42.0);
     qapi_free_AltThree(three);
     one = NULL;

-- 
2.4.3