commit a7e2799c7c3c790c83e015b48ba34ac0975b93bb
Author: Anthony Liguori <aliguori@us.ibm.com>
Date:   Thu Jul 16 22:16:02 2009 -0500

    Introduce macro for defining qdev properties.
    
    Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

diff --git a/hw/escc.c b/hw/escc.c
index 9abd092..43230b9 100644
--- a/hw/escc.c
+++ b/hw/escc.c
@@ -952,21 +952,9 @@ static SysBusDeviceInfo escc_info = {
     .qdev.name  = "escc",
     .qdev.size  = sizeof(SerialState),
     .qdev.props = (Property[]) {
-        {
-            .name = "frequency",
-            .info = &qdev_prop_uint32,
-            .offset = offsetof(SerialState, frequency),
-        },
-        {
-            .name = "it_shift",
-            .info = &qdev_prop_uint32,
-            .offset = offsetof(SerialState, it_shift),
-        },
-        {
-            .name = "disabled",
-            .info = &qdev_prop_uint32,
-            .offset = offsetof(SerialState, disabled),
-        },
+        QDEV_PROP(SerialState, frequency),
+        QDEV_PROP(SerialState, it_shift),
+        QDEV_PROP(SerialState, disabled),
         {
             .name = "chrB",
             .info = &qdev_prop_ptr,
diff --git a/hw/qdev.h b/hw/qdev.h
index 11744fa..957ce22 100644
--- a/hw/qdev.h
+++ b/hw/qdev.h
@@ -143,6 +143,25 @@ void do_info_qtree(Monitor *mon);
 
 /*** qdev-properties.c ***/
 
+#define CHOOSE(a, b, c) __builtin_choose_expr(a, b, c)
+#define TYPES_COMPAT(a, b) __builtin_types_compatible_p(a, b)
+#define TYPEOF_FIELD(type, field) typeof(((type *)0)->field)
+#define BUILD_BUG() sizeof(char[-1])
+
+#define QDEV_PROP(type, field)                                     \
+    {                                                              \
+        .name = stringify(field),                                  \
+        .offset = offsetof(type, field),                           \
+        .info =                                                    \
+        CHOOSE(TYPES_COMPAT(TYPEOF_FIELD(type, field), uint32_t),  \
+        &qdev_prop_uint32,                                         \
+        CHOOSE(TYPES_COMPAT(TYPEOF_FIELD(type, field), int32_t),   \
+        &qdev_prop_uint32,                                         \
+        CHOOSE(TYPES_COMPAT(TYPEOF_FIELD(type, field), void *),    \
+        &qdev_prop_ptr,                                            \
+        NULL))),                                                   \
+    }
+
 extern PropertyInfo qdev_prop_uint16;
 extern PropertyInfo qdev_prop_uint32;
 extern PropertyInfo qdev_prop_hex32;