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Re: [Qemu-devel] [PATCH v2 07/27] qom: add property get/set wrappers for


From: Anthony Liguori
Subject: Re: [Qemu-devel] [PATCH v2 07/27] qom: add property get/set wrappers for C types
Date: Mon, 06 Feb 2012 08:17:44 -0600
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.23) Gecko/20110922 Lightning/1.0b2 Thunderbird/3.1.15

On 02/04/2012 02:02 AM, Paolo Bonzini wrote:
Add wrappers that let you get/set properties using normal C data types.

Signed-off-by: Paolo Bonzini<address@hidden>

Reviewed-by: Anthony Liguori <address@hidden>

Regards,

Anthony Liguori

---
  include/qemu/object.h |   70 +++++++++++++++++++++++++++++
  qom/object.c          |  119 +++++++++++++++++++++++++++++++++++++++++++++----
  2 files changed, 180 insertions(+), 9 deletions(-)

diff --git a/include/qemu/object.h b/include/qemu/object.h
index ad7d32d..b27f80e 100644
--- a/include/qemu/object.h
+++ b/include/qemu/object.h
@@ -622,6 +622,76 @@ void object_property_get(Object *obj, struct Visitor *v, 
const char *name,
                           struct Error **errp);

  /**
+ * object_property_set_str:
+ * @value: the value to be written to the property
+ * @name: the name of the property
+ * @errp: returns an error if this function fails
+ *
+ * Writes a string value to a property.
+ */
+void object_property_set_str(Object *obj, const char *value,
+                             const char *name, struct Error **errp);
+
+/**
+ * object_property_get_str:
+ * @obj: the object
+ * @name: the name of the property
+ * @errp: returns an error if this function fails
+ *
+ * Returns: the value of the property, converted to a C string, or NULL if
+ * an error occurs (including when the property value is not a string).
+ * The caller should free the string.
+ */
+char *object_property_get_str(Object *obj, const char *name,
+                              struct Error **errp);
+
+/**
+ * object_property_set_bool:
+ * @value: the value to be written to the property
+ * @name: the name of the property
+ * @errp: returns an error if this function fails
+ *
+ * Writes a bool value to a property.
+ */
+void object_property_set_bool(Object *obj, bool value,
+                              const char *name, struct Error **errp);
+
+/**
+ * object_property_get_bool:
+ * @obj: the object
+ * @name: the name of the property
+ * @errp: returns an error if this function fails
+ *
+ * Returns: the value of the property, converted to a boolean, or NULL if
+ * an error occurs (including when the property value is not a bool).
+ */
+bool object_property_get_bool(Object *obj, const char *name,
+                              struct Error **errp);
+
+/**
+ * object_property_set_int:
+ * @value: the value to be written to the property
+ * @name: the name of the property
+ * @errp: returns an error if this function fails
+ *
+ * Writes an integer value to a property.
+ */
+void object_property_set_int(Object *obj, int64_t value,
+                             const char *name, struct Error **errp);
+
+/**
+ * object_property_get_int:
+ * @obj: the object
+ * @name: the name of the property
+ * @errp: returns an error if this function fails
+ *
+ * Returns: the value of the property, converted to an integer, or NULL if
+ * an error occurs (including when the property value is not an integer).
+ */
+int64_t object_property_get_int(Object *obj, const char *name,
+                                struct Error **errp);
+
+/**
   * object_property_set:
   * @obj: the object
   * @v: the visitor that will be used to write the property value.  This should
diff --git a/qom/object.c b/qom/object.c
index c0f6d54..d3a443f 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -14,6 +14,14 @@
  #include "qemu-common.h"
  #include "qapi/qapi-visit-core.h"

+/* TODO: replace QObject with a simpler visitor to avoid a dependency
+ * of the QOM core on QObject?  */
+#include "qemu/qom-qobject.h"
+#include "qobject.h"
+#include "qbool.h"
+#include "qint.h"
+#include "qstring.h"
+
  #define MAX_INTERFACES 32

  typedef struct InterfaceImpl InterfaceImpl;
@@ -646,6 +654,99 @@ void object_property_set(Object *obj, Visitor *v, const 
char *name,
      }
  }

+void object_property_set_str(Object *obj, const char *value,
+                             const char *name, Error **errp)
+{
+    QString *qstr = qstring_from_str(value);
+    object_property_set_qobject(obj, QOBJECT(qstr), name, errp);
+
+    QDECREF(qstr);
+}
+
+char *object_property_get_str(Object *obj, const char *name,
+                              Error **errp)
+{
+    QObject *ret = object_property_get_qobject(obj, name, errp);
+    QString *qstring;
+    char *retval;
+
+    if (!ret) {
+        return NULL;
+    }
+    qstring = qobject_to_qstring(ret);
+    if (!qstring) {
+        error_set(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
+        retval = NULL;
+    } else {
+        retval = g_strdup(qstring_get_str(qstring));
+    }
+
+    QDECREF(qstring);
+    return retval;
+}
+
+void object_property_set_bool(Object *obj, bool value,
+                              const char *name, Error **errp)
+{
+    QBool *qbool = qbool_from_int(value);
+    object_property_set_qobject(obj, QOBJECT(qbool), name, errp);
+
+    QDECREF(qbool);
+}
+
+bool object_property_get_bool(Object *obj, const char *name,
+                              Error **errp)
+{
+    QObject *ret = object_property_get_qobject(obj, name, errp);
+    QBool *qbool;
+    bool retval;
+
+    if (!ret) {
+        return false;
+    }
+    qbool = qobject_to_qbool(ret);
+    if (!qbool) {
+        error_set(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
+        retval = false;
+    } else {
+        retval = qbool_get_int(qbool);
+    }
+
+    QDECREF(qbool);
+    return retval;
+}
+
+void object_property_set_int(Object *obj, int64_t value,
+                             const char *name, Error **errp)
+{
+    QInt *qint = qint_from_int(value);
+    object_property_set_qobject(obj, QOBJECT(qint), name, errp);
+
+    QDECREF(qint);
+}
+
+int64_t object_property_get_int(Object *obj, const char *name,
+                                Error **errp)
+{
+    QObject *ret = object_property_get_qobject(obj, name, errp);
+    QInt *qint;
+    int64_t retval;
+
+    if (!ret) {
+        return -1;
+    }
+    qint = qobject_to_qint(ret);
+    if (!qint) {
+        error_set(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
+        retval = -1;
+    } else {
+        retval = qint_get_int(qint);
+    }
+
+    QDECREF(qint);
+    return retval;
+}
+
  const char *object_property_get_type(Object *obj, const char *name, Error 
**errp)
  {
      ObjectProperty *prop = object_property_find(obj, name);
@@ -927,8 +1028,8 @@ typedef struct StringProperty
      void (*set)(Object *, const char *, Error **);
  } StringProperty;

-static void object_property_get_str(Object *obj, Visitor *v, void *opaque,
-                                    const char *name, Error **errp)
+static void property_get_str(Object *obj, Visitor *v, void *opaque,
+                             const char *name, Error **errp)
  {
      StringProperty *prop = opaque;
      char *value;
@@ -940,8 +1041,8 @@ static void object_property_get_str(Object *obj, Visitor 
*v, void *opaque,
      }
  }

-static void object_property_set_str(Object *obj, Visitor *v, void *opaque,
-                                  const char *name, Error **errp)
+static void property_set_str(Object *obj, Visitor *v, void *opaque,
+                             const char *name, Error **errp)
  {
      StringProperty *prop = opaque;
      char *value;
@@ -957,8 +1058,8 @@ static void object_property_set_str(Object *obj, Visitor 
*v, void *opaque,
      g_free(value);
  }

-static void object_property_release_str(Object *obj, const char *name,
-                                      void *opaque)
+static void property_release_str(Object *obj, const char *name,
+                                 void *opaque)
  {
      StringProperty *prop = opaque;
      g_free(prop);
@@ -975,8 +1076,8 @@ void object_property_add_str(Object *obj, const char *name,
      prop->set = set;

      object_property_add(obj, name, "string",
-                        get ? object_property_get_str : NULL,
-                        set ? object_property_set_str : NULL,
-                        object_property_release_str,
+                        get ? property_get_str : NULL,
+                        set ? property_set_str : NULL,
+                        property_release_str,
                          prop, errp);
  }




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