[Qemu-devel] [RfC PATCH 0/2] qdev: property macros.

[Qemu-devel] [RfC PATCH 0/2] qdev: property macros.

[Gerd Hoffmann]

  Hi folks,

Presenting a new version of my patch to continue the discussion how
the macros should look like ;)

There are DEFINE_PROP_$TYPE("name", struct, field, default) macros for
each property type, thus no gcc-powered automagic selection.

typeof(struct->field) is verifyed to be the correct one for the given
property though (new in this version).  This uses gcc extentions, but
as it is a check only it could easily be turned off for non-gcc
compilers if needed.

Comments?

cheers,
  Gerd

[Qemu-devel] [RfC PATCH 0/2] qdev: property macros.

[Gerd Hoffmann]

  Hi folks,

Presenting a new version of my patch to continue the discussion how
the macros should look like ;)

There are DEFINE_PROP_$TYPE("name", struct, field, default) macros for
each property type, thus no gcc-powered automagic selection.

typeof(struct->field) is verifyed to be the correct one for the given
property though (new in this version).  This uses gcc extentions, but
as it is a check only it could easily be turned off for non-gcc
compilers if needed.

Comments?

cheers,
  Gerd

[Qemu-devel] [RfC PATCH 1/2] qdev/pci: make PCIDevice->devfn uint32_t

[Gerd Hoffmann]

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/pci.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/hw/pci.h b/hw/pci.h
index cbfea6a..a2ec16a 100644
--- a/hw/pci.h
+++ b/hw/pci.h
@@ -177,7 +177,7 @@ struct PCIDevice {
 
     /* the following fields are read only */
     PCIBus *bus;
-    int devfn;
+    uint32_t devfn;
     char name[64];
     PCIIORegion io_regions[PCI_NUM_REGIONS];
 
-- 
1.6.2.5

[Qemu-devel] [RfC PATCH 2/2] qdev/prop: macros for creating typechecked properties.

[Gerd Hoffmann]

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/pci.c       |    5 +++++
 hw/qdev-addr.h |    3 +++
 hw/qdev.h      |   40 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 48 insertions(+), 0 deletions(-)

diff --git a/hw/pci.c b/hw/pci.c
index 4d0cdc7..bac0f8b 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -60,6 +60,7 @@ static struct BusInfo pci_bus_info = {
     .size       = sizeof(PCIBus),
     .print_dev  = pcibus_dev_print,
     .props      = (Property[]) {
+#if 0
         {
             .name   = "addr",
             .info   = &qdev_prop_pci_devfn,
@@ -67,6 +68,10 @@ static struct BusInfo pci_bus_info = {
             .defval = (uint32_t[]) { -1 },
         },
         {/* end of list */}
+#else
+        DEFINE_PROP_PCI_DEVFN("addr", PCIDevice, devfn, -1),
+        DEFINE_PROP_END_OF_LIST()
+#endif
     }
 };
 
diff --git a/hw/qdev-addr.h b/hw/qdev-addr.h
index f02bd7a..9568c27 100644
--- a/hw/qdev-addr.h
+++ b/hw/qdev-addr.h
@@ -1,2 +1,5 @@
+#define DEFINE_PROP_TADDR(_n, _s, _f)           \
+    DEFINE_PROP(_n, _s, _f, qdev_prop_taddr, target_phys_addr_t)
+
 extern PropertyInfo qdev_prop_taddr;
 void qdev_prop_set_taddr(DeviceState *dev, const char *name, target_phys_addr_t value);
diff --git a/hw/qdev.h b/hw/qdev.h
index af2ee0f..3a02af9 100644
--- a/hw/qdev.h
+++ b/hw/qdev.h
@@ -155,6 +155,46 @@ extern PropertyInfo qdev_prop_ptr;
 extern PropertyInfo qdev_prop_macaddr;
 extern PropertyInfo qdev_prop_pci_devfn;
 
+extern int type_check_failed;
+#define typeof_field(type, field) typeof(((type *)0)->field)
+#define type_check(t1,t2) __builtin_choose_expr( \
+        __builtin_types_compatible_p(t1,t2),0,type_check_failed)
+
+#define DEFINE_PROP(_name, _state, _field, _prop, _type) { \
+        .name      = (_name),                                    \
+        .info      = &(_prop),                                   \
+        .offset    = offsetof(_state, _field)                    \
+            + type_check(_type,typeof_field(_state, _field)),    \
+        }
+#define DEFINE_PROP_DEFAULT(_name, _state, _field, _defval, _prop, _type) { \
+        .name      = (_name),                                           \
+        .info      = &(_prop),                                          \
+        .offset    = offsetof(_state, _field)                           \
+            + type_check(_type,typeof_field(_state, _field)),           \
+        .defval    = (_type[]) { _defval },                             \
+        }
+
+#define DEFINE_PROP_UINT16(_n, _s, _f, _d)                      \
+    DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_uint16, uint16_t)
+#define DEFINE_PROP_UINT32(_n, _s, _f, _d)                      \
+    DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_uint32, uint32_t)
+#define DEFINE_PROP_UINT64(_n, _s, _f, _d)                      \
+    DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_uint64, uint64_t)
+#define DEFINE_PROP_HEX32(_n, _s, _f, _d)                       \
+    DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_hex32, uint32_t)
+#define DEFINE_PROP_HEX64(_n, _s, _f, _d)                       \
+    DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_hex64, uint64_t)
+#define DEFINE_PROP_PCI_DEVFN(_n, _s, _f, _d)                   \
+    DEFINE_PROP_DEFAULT(_n, _s, _f, _d, qdev_prop_pci_devfn, uint32_t)
+
+#define DEFINE_PROP_PTR(_n, _s, _f)             \
+    DEFINE_PROP(_n, _s, _f, qdev_prop_ptr, void*)
+#define DEFINE_PROP_MACADDR(_n, _s, _f)         \
+    DEFINE_PROP(_n, _s, _f, qdev_prop_macaddr, uint8_t[6])
+
+#define DEFINE_PROP_END_OF_LIST()               \
+    {}
+
 /* Set properties between creation and init.  */
 void *qdev_get_prop_ptr(DeviceState *dev, Property *prop);
 int qdev_prop_parse(DeviceState *dev, const char *name, const char *value);
-- 
1.6.2.5