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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] golang/xenlight: Fix handling of marshalling of empty elements for keyed unions
Keyed types in libxl_types.idl can have elements of type 'None'. The
golang type generator (correctly) don't implement any union types for
these empty elements. However, the toC and fromC helper generators
incorrectly treat these elements as invalid.
Consider for example, libxl_channelinfo. The idl contains the
following keyed element:
("u", KeyedUnion(None, libxl_channel_connection, "connection",
[("unknown", None),
("pty", Struct(None, [("path", string),])),
("socket", None),
])),
But the toC marshaller currently looks like this:
switch x.Connection {
case ChannelConnectionPty:
tmp, ok := x.ConnectionUnion.(ChannelinfoConnectionUnionPty)
if !ok {
return errors.New("wrong type for union key connection")
}
var pty C.libxl_channelinfo_connection_union_pty
if tmp.Path != "" {
pty.path = C.CString(tmp.Path)
}
ptyBytes := C.GoBytes(unsafe.Pointer(&pty),
C.sizeof_libxl_channelinfo_connection_union_pty)
copy(xc.u[:], ptyBytes)
default:
return fmt.Errorf("invalid union key '%v'", x.Connection)
}
Which means toC() will fail for ChannelConnectionUnknown or
ChannelConnectionSocket.
Modify the generator to handle keyed union elements of type 'None'.
For fromC, set the value to 'nil'; for toC, leave things as-is.
Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxx>
---
In toC, instead of leaving the union alone for "empty" elements, we
could zero the whole union out. That's probably not necessary.
CC: Ian Jackson <ian.jackson@xxxxxxxxxx>
CC: Wei Liu <wl@xxxxxxx>
CC: Nick Rosbrook <rosbrookn@xxxxxxxxxxxx>
---
tools/golang/xenlight/gengotypes.py | 19 +++++---
tools/golang/xenlight/helpers.gen.go | 66 ++++++++++++++++++++--------
tools/golang/xenlight/types.gen.go | 1 +
3 files changed, 63 insertions(+), 23 deletions(-)
diff --git a/tools/golang/xenlight/gengotypes.py
b/tools/golang/xenlight/gengotypes.py
index f81271f3c0..50dada309b 100644
--- a/tools/golang/xenlight/gengotypes.py
+++ b/tools/golang/xenlight/gengotypes.py
@@ -335,6 +335,7 @@ def xenlight_golang_union_from_C(ty = None, union_name =
'', struct_name = ''):
gokeyname = xenlight_golang_fmt_name(keyname)
keytype = ty.keyvar.type.typename
gokeytype = xenlight_golang_fmt_name(keytype)
+ field_name = xenlight_golang_fmt_name('{}_union'.format(keyname))
interface_name = '{}_{}_union'.format(struct_name, keyname)
interface_name = xenlight_golang_fmt_name(interface_name, exported=False)
@@ -351,11 +352,11 @@ def xenlight_golang_union_from_C(ty = None, union_name =
'', struct_name = ''):
# Add to list of cases to make for the switch
# statement below.
+ cases[f.name] = (val, f.type)
+
if f.type is None:
continue
- cases[f.name] = val
-
# Define fromC func for 'union' struct.
typename = '{}_{}_union_{}'.format(struct_name,keyname,f.name)
gotypename = xenlight_golang_fmt_name(typename)
@@ -382,9 +383,15 @@ def xenlight_golang_union_from_C(ty = None, union_name =
'', struct_name = ''):
# Create switch statement to determine which 'union element'
# to populate in the Go struct.
- for case_name, case_val in cases.items():
+ for case_name, case_tuple in cases.items():
+ (case_val, case_type) = case_tuple
+
s += 'case {}:\n'.format(case_val)
+ if case_type is None:
+ s += "x.{} = nil\n".format(field_name)
+ continue
+
gotype = '{}_{}_union_{}'.format(struct_name,keyname,case_name)
gotype = xenlight_golang_fmt_name(gotype)
goname = '{}_{}'.format(keyname,case_name)
@@ -394,7 +401,6 @@ def xenlight_golang_union_from_C(ty = None, union_name =
'', struct_name = ''):
s += 'if err := {}.fromC(xc);'.format(goname)
s += 'err != nil {{\n return fmt.Errorf("converting field {}: %v",
err) \n}}\n'.format(goname)
- field_name = xenlight_golang_fmt_name('{}_union'.format(keyname))
s += 'x.{} = {}\n'.format(field_name, goname)
# End switch statement
@@ -551,10 +557,13 @@ def xenlight_golang_union_to_C(ty = None, union_name = '',
for f in ty.fields:
key_val = '{}_{}'.format(keytype, f.name)
key_val = xenlight_golang_fmt_name(key_val)
+
+ s += 'case {}:\n'.format(key_val)
+
if f.type is None:
+ s += "break\n"
continue
- s += 'case {}:\n'.format(key_val)
cgotype = '{}_{}_union_{}'.format(struct_name,keyname,f.name)
gotype = xenlight_golang_fmt_name(cgotype)
diff --git a/tools/golang/xenlight/helpers.gen.go
b/tools/golang/xenlight/helpers.gen.go
index b4d7dca1c6..344ce9a461 100644
--- a/tools/golang/xenlight/helpers.gen.go
+++ b/tools/golang/xenlight/helpers.gen.go
@@ -493,12 +493,16 @@ func (x *Channelinfo) fromC(xc *C.libxl_channelinfo)
error {
x.Rref = int(xc.rref)
x.Connection = ChannelConnection(xc.connection)
switch x.Connection {
+ case ChannelConnectionUnknown:
+ x.ConnectionUnion = nil
case ChannelConnectionPty:
var connectionPty ChannelinfoConnectionUnionPty
if err := connectionPty.fromC(xc); err != nil {
return fmt.Errorf("converting field connectionPty: %v",
err)
}
x.ConnectionUnion = connectionPty
+ case ChannelConnectionSocket:
+ x.ConnectionUnion = nil
default:
return fmt.Errorf("invalid union key '%v'", x.Connection)
}
@@ -537,6 +541,8 @@ func (x *Channelinfo) toC(xc *C.libxl_channelinfo) (err
error) {
xc.rref = C.int(x.Rref)
xc.connection = C.libxl_channel_connection(x.Connection)
switch x.Connection {
+ case ChannelConnectionUnknown:
+ break
case ChannelConnectionPty:
tmp, ok := x.ConnectionUnion.(ChannelinfoConnectionUnionPty)
if !ok {
@@ -548,6 +554,8 @@ func (x *Channelinfo) toC(xc *C.libxl_channelinfo) (err
error) {
}
ptyBytes := C.GoBytes(unsafe.Pointer(&pty),
C.sizeof_libxl_channelinfo_connection_union_pty)
copy(xc.u[:], ptyBytes)
+ case ChannelConnectionSocket:
+ break
default:
return fmt.Errorf("invalid union key '%v'", x.Connection)
}
@@ -701,6 +709,7 @@ func (x *DomainCreateInfo) fromC(xc
*C.libxl_domain_create_info) error {
x.Ssidref = uint32(xc.ssidref)
x.SsidLabel = C.GoString(xc.ssid_label)
x.Name = C.GoString(xc.name)
+ x.Domid = Domid(xc.domid)
if err := x.Uuid.fromC(&xc.uuid); err != nil {
return fmt.Errorf("converting field Uuid: %v", err)
}
@@ -744,6 +753,7 @@ func (x *DomainCreateInfo) toC(xc
*C.libxl_domain_create_info) (err error) {
if x.Name != "" {
xc.name = C.CString(x.Name)
}
+ xc.domid = C.libxl_domid(x.Domid)
if err := x.Uuid.toC(&xc.uuid); err != nil {
return fmt.Errorf("converting field Uuid: %v", err)
}
@@ -1203,24 +1213,26 @@ func (x *DomainBuildInfo) fromC(xc
*C.libxl_domain_build_info) error {
x.Tee = TeeType(xc.tee)
x.Type = DomainType(xc._type)
switch x.Type {
- case DomainTypePv:
- var typePv DomainBuildInfoTypeUnionPv
- if err := typePv.fromC(xc); err != nil {
- return fmt.Errorf("converting field typePv: %v", err)
- }
- x.TypeUnion = typePv
case DomainTypeHvm:
var typeHvm DomainBuildInfoTypeUnionHvm
if err := typeHvm.fromC(xc); err != nil {
return fmt.Errorf("converting field typeHvm: %v", err)
}
x.TypeUnion = typeHvm
+ case DomainTypePv:
+ var typePv DomainBuildInfoTypeUnionPv
+ if err := typePv.fromC(xc); err != nil {
+ return fmt.Errorf("converting field typePv: %v", err)
+ }
+ x.TypeUnion = typePv
case DomainTypePvh:
var typePvh DomainBuildInfoTypeUnionPvh
if err := typePvh.fromC(xc); err != nil {
return fmt.Errorf("converting field typePvh: %v", err)
}
x.TypeUnion = typePvh
+ case DomainTypeInvalid:
+ x.TypeUnion = nil
default:
return fmt.Errorf("invalid union key '%v'", x.Type)
}
@@ -1721,6 +1733,8 @@ func (x *DomainBuildInfo) toC(xc
*C.libxl_domain_build_info) (err error) {
}
pvhBytes := C.GoBytes(unsafe.Pointer(&pvh),
C.sizeof_libxl_domain_build_info_type_union_pvh)
copy(xc.u[:], pvhBytes)
+ case DomainTypeInvalid:
+ break
default:
return fmt.Errorf("invalid union key '%v'", x.Type)
}
@@ -2648,6 +2662,10 @@ func (x *DeviceChannel) fromC(xc
*C.libxl_device_channel) error {
x.Name = C.GoString(xc.name)
x.Connection = ChannelConnection(xc.connection)
switch x.Connection {
+ case ChannelConnectionUnknown:
+ x.ConnectionUnion = nil
+ case ChannelConnectionPty:
+ x.ConnectionUnion = nil
case ChannelConnectionSocket:
var connectionSocket DeviceChannelConnectionUnionSocket
if err := connectionSocket.fromC(xc); err != nil {
@@ -2688,6 +2706,10 @@ func (x *DeviceChannel) toC(xc *C.libxl_device_channel)
(err error) {
}
xc.connection = C.libxl_channel_connection(x.Connection)
switch x.Connection {
+ case ChannelConnectionUnknown:
+ break
+ case ChannelConnectionPty:
+ break
case ChannelConnectionSocket:
tmp, ok :=
x.ConnectionUnion.(DeviceChannelConnectionUnionSocket)
if !ok {
@@ -4368,24 +4390,28 @@ func (x *Event) fromC(xc *C.libxl_event) error {
x.ForUser = uint64(xc.for_user)
x.Type = EventType(xc._type)
switch x.Type {
- case EventTypeOperationComplete:
- var typeOperationComplete EventTypeUnionOperationComplete
- if err := typeOperationComplete.fromC(xc); err != nil {
- return fmt.Errorf("converting field
typeOperationComplete: %v", err)
- }
- x.TypeUnion = typeOperationComplete
case EventTypeDomainShutdown:
var typeDomainShutdown EventTypeUnionDomainShutdown
if err := typeDomainShutdown.fromC(xc); err != nil {
return fmt.Errorf("converting field typeDomainShutdown:
%v", err)
}
x.TypeUnion = typeDomainShutdown
+ case EventTypeDomainDeath:
+ x.TypeUnion = nil
case EventTypeDiskEject:
var typeDiskEject EventTypeUnionDiskEject
if err := typeDiskEject.fromC(xc); err != nil {
return fmt.Errorf("converting field typeDiskEject: %v",
err)
}
x.TypeUnion = typeDiskEject
+ case EventTypeOperationComplete:
+ var typeOperationComplete EventTypeUnionOperationComplete
+ if err := typeOperationComplete.fromC(xc); err != nil {
+ return fmt.Errorf("converting field
typeOperationComplete: %v", err)
+ }
+ x.TypeUnion = typeOperationComplete
+ case EventTypeDomainCreateConsoleAvailable:
+ x.TypeUnion = nil
default:
return fmt.Errorf("invalid union key '%v'", x.Type)
}
@@ -4452,6 +4478,8 @@ func (x *Event) toC(xc *C.libxl_event) (err error) {
domain_shutdown.shutdown_reason = C.uint8_t(tmp.ShutdownReason)
domain_shutdownBytes :=
C.GoBytes(unsafe.Pointer(&domain_shutdown),
C.sizeof_libxl_event_type_union_domain_shutdown)
copy(xc.u[:], domain_shutdownBytes)
+ case EventTypeDomainDeath:
+ break
case EventTypeDiskEject:
tmp, ok := x.TypeUnion.(EventTypeUnionDiskEject)
if !ok {
@@ -4475,6 +4503,8 @@ func (x *Event) toC(xc *C.libxl_event) (err error) {
operation_complete.rc = C.int(tmp.Rc)
operation_completeBytes :=
C.GoBytes(unsafe.Pointer(&operation_complete),
C.sizeof_libxl_event_type_union_operation_complete)
copy(xc.u[:], operation_completeBytes)
+ case EventTypeDomainCreateConsoleAvailable:
+ break
default:
return fmt.Errorf("invalid union key '%v'", x.Type)
}
@@ -4545,18 +4575,18 @@ func (x *PsrHwInfo) fromC(xc *C.libxl_psr_hw_info)
error {
x.Id = uint32(xc.id)
x.Type = PsrFeatType(xc._type)
switch x.Type {
- case PsrFeatTypeMba:
- var typeMba PsrHwInfoTypeUnionMba
- if err := typeMba.fromC(xc); err != nil {
- return fmt.Errorf("converting field typeMba: %v", err)
- }
- x.TypeUnion = typeMba
case PsrFeatTypeCat:
var typeCat PsrHwInfoTypeUnionCat
if err := typeCat.fromC(xc); err != nil {
return fmt.Errorf("converting field typeCat: %v", err)
}
x.TypeUnion = typeCat
+ case PsrFeatTypeMba:
+ var typeMba PsrHwInfoTypeUnionMba
+ if err := typeMba.fromC(xc); err != nil {
+ return fmt.Errorf("converting field typeMba: %v", err)
+ }
+ x.TypeUnion = typeMba
default:
return fmt.Errorf("invalid union key '%v'", x.Type)
}
diff --git a/tools/golang/xenlight/types.gen.go
b/tools/golang/xenlight/types.gen.go
index ede49b4886..4aaee20b95 100644
--- a/tools/golang/xenlight/types.gen.go
+++ b/tools/golang/xenlight/types.gen.go
@@ -403,6 +403,7 @@ type DomainCreateInfo struct {
Ssidref uint32
SsidLabel string
Name string
+ Domid Domid
Uuid Uuid
Xsdata KeyValueList
Platformdata KeyValueList
--
2.25.1
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