commit e1bc2f7b3fb19ab2abcec3d5b15e045b00ae9da1
author Michael Roth <mdroth@linux.vnet.ibm.com> Mon Sep 19 19:03:11 2011 -0500
committer Luiz Capitulino <lcapitulino@redhat.com> Tue Oct 04 11:00:46 2011 -0300
tree 737f967f3510569800635e938565b9501dcd3232
parent 0b9d854230737b214c01e89f0b679ea36fd59e5e

qapi: modify visitor code generation for list iteration

Modify logic such that we never assign values to the list head argument
to progress through the list on subsequent iterations, instead rely only
on having our return value passed back in as an argument on the next
call. Also update QMP I/O visitors and test cases accordingly, and add a
missing test case for QmpOutputVisitor.

Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>

qapi/qmp-output-visitor.c

diff --git a/qapi/qmp-output-visitor.c b/qapi/qmp-output-visitor.c
index 4419a31..d67724e 100644
--- a/qapi/qmp-output-visitor.c
+++ b/qapi/qmp-output-visitor.c
@@ -20,6 +20,7 @@
 typedef struct QStackEntry
 {
     QObject *value;
+    bool is_list_head;
     QTAILQ_ENTRY(QStackEntry) node;
 } QStackEntry;
 
@@ -45,6 +46,9 @@
     QStackEntry *e = g_malloc0(sizeof(*e));
 
     e->value = value;
+    if (qobject_type(e->value) == QTYPE_QLIST) {
+        e->is_list_head = true;
+    }
     QTAILQ_INSERT_HEAD(&qov->stack, e, node);
 }
 
@@ -122,12 +126,20 @@
     qmp_output_push(qov, list);
 }
 
-static GenericList *qmp_output_next_list(Visitor *v, GenericList **list,
+static GenericList *qmp_output_next_list(Visitor *v, GenericList **listp,
                                          Error **errp)
 {
-    GenericList *retval = *list;
-    *list = retval->next;
-    return retval;
+    GenericList *list = *listp;
+    QmpOutputVisitor *qov = to_qov(v);
+    QStackEntry *e = QTAILQ_FIRST(&qov->stack);
+
+    assert(e);
+    if (e->is_list_head) {
+        e->is_list_head = false;
+        return list;
+    }
+
+    return list ? list->next : NULL;
 }
 
 static void qmp_output_end_list(Visitor *v, Error **errp)