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From a2a326f0a6b544335c49432248201fb811f1fc2b Mon Sep 17 00:00:00 2001
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From: Kevin Wolf <kwolf@redhat.com>
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Date: Mon, 9 Sep 2013 14:28:11 +0200
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Subject: [PATCH 20/38] qapi: Add visitor for implicit structs
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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Message-id: <1378736903-18489-21-git-send-email-kwolf@redhat.com>
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Patchwork-id: 54207
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O-Subject: [RHEL-7.0 qemu-kvm PATCH 20/32] qapi: Add visitor for implicit structs
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Bugzilla: 1005818
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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Bugzilla: 1005818
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These can be used when an embedded struct is parsed and members not
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belonging to the struct may be present in the input (e.g. parsing a
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flat namespace QMP union, where fields from both the base and one
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of the alternative types are mixed in the JSON object)
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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(cherry picked from commit 761d524dbcc5bb41213dd0f238f43c273bc2b077)
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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---
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 include/qapi/visitor-impl.h |  4 ++++
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 include/qapi/visitor.h      |  3 +++
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 qapi/qapi-visit-core.c      | 16 ++++++++++++++++
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 qapi/qmp-input-visitor.c    | 14 ++++++++++++++
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 4 files changed, 37 insertions(+)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 include/qapi/visitor-impl.h |    4 ++++
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 include/qapi/visitor.h      |    3 +++
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 qapi/qapi-visit-core.c      |   16 ++++++++++++++++
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 qapi/qmp-input-visitor.c    |   14 ++++++++++++++
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 4 files changed, 37 insertions(+), 0 deletions(-)
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diff --git a/include/qapi/visitor-impl.h b/include/qapi/visitor-impl.h
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index 5159964..5c1297f 100644
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--- a/include/qapi/visitor-impl.h
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+++ b/include/qapi/visitor-impl.h
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@@ -22,6 +22,10 @@ struct Visitor
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                          const char *name, size_t size, Error **errp);
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     void (*end_struct)(Visitor *v, Error **errp);
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+    void (*start_implicit_struct)(Visitor *v, void **obj, size_t size,
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+                                  Error **errp);
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+    void (*end_implicit_struct)(Visitor *v, Error **errp);
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+
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     void (*start_list)(Visitor *v, const char *name, Error **errp);
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     GenericList *(*next_list)(Visitor *v, GenericList **list, Error **errp);
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     void (*end_list)(Visitor *v, Error **errp);
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diff --git a/include/qapi/visitor.h b/include/qapi/visitor.h
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index 1fef18c..a1cdd81 100644
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--- a/include/qapi/visitor.h
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+++ b/include/qapi/visitor.h
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@@ -30,6 +30,9 @@ void visit_end_handle(Visitor *v, Error **errp);
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 void visit_start_struct(Visitor *v, void **obj, const char *kind,
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                         const char *name, size_t size, Error **errp);
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 void visit_end_struct(Visitor *v, Error **errp);
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+void visit_start_implicit_struct(Visitor *v, void **obj, size_t size,
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+                                 Error **errp);
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+void visit_end_implicit_struct(Visitor *v, Error **errp);
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 void visit_start_list(Visitor *v, const char *name, Error **errp);
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 GenericList *visit_next_list(Visitor *v, GenericList **list, Error **errp);
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 void visit_end_list(Visitor *v, Error **errp);
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diff --git a/qapi/qapi-visit-core.c b/qapi/qapi-visit-core.c
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index 401ee6e..9b4d51b 100644
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--- a/qapi/qapi-visit-core.c
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+++ b/qapi/qapi-visit-core.c
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@@ -45,6 +45,22 @@ void visit_end_struct(Visitor *v, Error **errp)
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     v->end_struct(v, errp);
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 }
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+void visit_start_implicit_struct(Visitor *v, void **obj, size_t size,
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+                                 Error **errp)
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+{
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+    if (!error_is_set(errp) && v->start_implicit_struct) {
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+        v->start_implicit_struct(v, obj, size, errp);
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+    }
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+}
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+
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+void visit_end_implicit_struct(Visitor *v, Error **errp)
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+{
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+    assert(!error_is_set(errp));
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+    if (v->end_implicit_struct) {
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+        v->end_implicit_struct(v, errp);
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+    }
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+}
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+
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 void visit_start_list(Visitor *v, const char *name, Error **errp)
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 {
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     if (!error_is_set(errp)) {
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diff --git a/qapi/qmp-input-visitor.c b/qapi/qmp-input-visitor.c
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index 67fb127..59c5cac 100644
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--- a/qapi/qmp-input-visitor.c
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+++ b/qapi/qmp-input-visitor.c
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@@ -144,6 +144,18 @@ static void qmp_input_end_struct(Visitor *v, Error **errp)
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     qmp_input_pop(qiv, errp);
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 }
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+static void qmp_input_start_implicit_struct(Visitor *v, void **obj,
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+                                            size_t size, Error **errp)
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+{
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+    if (obj) {
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+        *obj = g_malloc0(size);
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+    }
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+}
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+
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+static void qmp_input_end_implicit_struct(Visitor *v, Error **errp)
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+{
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+}
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+
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 static void qmp_input_start_list(Visitor *v, const char *name, Error **errp)
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 {
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     QmpInputVisitor *qiv = to_qiv(v);
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@@ -293,6 +305,8 @@ QmpInputVisitor *qmp_input_visitor_new(QObject *obj)
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     v->visitor.start_struct = qmp_input_start_struct;
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     v->visitor.end_struct = qmp_input_end_struct;
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+    v->visitor.start_implicit_struct = qmp_input_start_implicit_struct;
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+    v->visitor.end_implicit_struct = qmp_input_end_implicit_struct;
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     v->visitor.start_list = qmp_input_start_list;
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     v->visitor.next_list = qmp_input_next_list;
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     v->visitor.end_list = qmp_input_end_list;
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-- 
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1.7.1
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