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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen staging] golang/xenlight: use struct pointers in keyed union fields
commit 1997940ad25e3566d1ab38496b8c7b07a086695a
Author: Nick Rosbrook <rosbrookn@xxxxxxxxx>
AuthorDate: Mon May 24 16:36:46 2021 -0400
Commit: George Dunlap <george.dunlap@xxxxxxxxxx>
CommitDate: Mon Jun 21 16:49:08 2021 +0100
golang/xenlight: use struct pointers in keyed union fields
Currently, when marshalig Go types with keyed union fields, we assign the
value of the struct (e.g. DomainBuildInfoTypeUnionHvm) which implements the
interface of the keyed union field (e.g. DomainBuildInfoTypeUnion).
As-is, this means that if a populated DomainBuildInfo is marshaled to
e.g. JSON, unmarshaling back to DomainBuildInfo will fail.
When the encoding/json is unmarshaling data into a Go type, and
encounters a JSON object, it basically can either marshal the data into
an empty interface, a map, or a struct. It cannot, however, marshal data
into an interface with at least one method defined on it (e.g.
DomainBuildInfoTypeUnion). Before this check is done, however, the
decoder will check if the Go type is a pointer, and dereference it if
so. It will then use the type of this value as the "target" type.
This means that if the TypeUnion field is populated with a
DomainBuildInfoTypeUnion, the decoder will see a non-empty interface and
fail. If the TypeUnion field is populated with a
*DomainBuildInfoTypeUnionHvm, it dereferences the pointer and sees a
struct instead, allowing decoding to continue normally.
Since there does not appear to be a strict need for NOT using pointers
in these fields, update code generation to set keyed union fields to
pointers of their implementing structs.
Signed-off-by: Nick Rosbrook <rosbrookn@xxxxxxxxxxxx>
Reviewed-by: George Dunlap <george.dunlap@xxxxxxxxxx>
---
tools/golang/xenlight/gengotypes.py | 4 ++--
tools/golang/xenlight/helpers.gen.go | 44 ++++++++++++++++++------------------
2 files changed, 24 insertions(+), 24 deletions(-)
diff --git a/tools/golang/xenlight/gengotypes.py
b/tools/golang/xenlight/gengotypes.py
index ef3279a910..ac1cf060dd 100644
--- a/tools/golang/xenlight/gengotypes.py
+++ b/tools/golang/xenlight/gengotypes.py
@@ -404,7 +404,7 @@ def xenlight_golang_union_from_C(ty = None, union_name =
'', struct_name = ''):
s += 'if err := {0}.fromC(xc);'.format(goname)
s += 'err != nil {{\n return fmt.Errorf("converting field {0}: %v",
err)\n}}\n'.format(goname)
- s += 'x.{0} = {1}\n'.format(field_name, goname)
+ s += 'x.{0} = &{1}\n'.format(field_name, goname)
# End switch statement
s += 'default:\n'
@@ -570,7 +570,7 @@ def xenlight_golang_union_to_C(ty = None, union_name = '',
gotype = xenlight_golang_fmt_name(cgotype)
field_name = xenlight_golang_fmt_name('{0}_union'.format(keyname))
- s += 'tmp, ok := x.{0}.({1})\n'.format(field_name,gotype)
+ s += 'tmp, ok := x.{0}.(*{1})\n'.format(field_name,gotype)
s += 'if !ok {\n'
s += 'return errors.New("wrong type for union key
{0}")\n'.format(keyname)
s += '}\n'
diff --git a/tools/golang/xenlight/helpers.gen.go
b/tools/golang/xenlight/helpers.gen.go
index b454b12d52..db82537b42 100644
--- a/tools/golang/xenlight/helpers.gen.go
+++ b/tools/golang/xenlight/helpers.gen.go
@@ -433,7 +433,7 @@ var connectionPty ChannelinfoConnectionUnionPty
if err := connectionPty.fromC(xc);err != nil {
return fmt.Errorf("converting field connectionPty: %v", err)
}
-x.ConnectionUnion = connectionPty
+x.ConnectionUnion = &connectionPty
case ChannelConnectionSocket:
x.ConnectionUnion = nil
case ChannelConnectionUnknown:
@@ -473,7 +473,7 @@ switch x.Connection{
case ChannelConnectionUnknown:
break
case ChannelConnectionPty:
-tmp, ok := x.ConnectionUnion.(ChannelinfoConnectionUnionPty)
+tmp, ok := x.ConnectionUnion.(*ChannelinfoConnectionUnionPty)
if !ok {
return errors.New("wrong type for union key connection")
}
@@ -1094,7 +1094,7 @@ var typeHvm DomainBuildInfoTypeUnionHvm
if err := typeHvm.fromC(xc);err != nil {
return fmt.Errorf("converting field typeHvm: %v", err)
}
-x.TypeUnion = typeHvm
+x.TypeUnion = &typeHvm
case DomainTypeInvalid:
x.TypeUnion = nil
case DomainTypePv:
@@ -1102,13 +1102,13 @@ var typePv DomainBuildInfoTypeUnionPv
if err := typePv.fromC(xc);err != nil {
return fmt.Errorf("converting field typePv: %v", err)
}
-x.TypeUnion = typePv
+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
+x.TypeUnion = &typePvh
default:
return fmt.Errorf("invalid union key '%v'", x.Type)}
x.ArchArm.GicVersion = GicVersion(xc.arch_arm.gic_version)
@@ -1427,7 +1427,7 @@ xc.tee = C.libxl_tee_type(x.Tee)
xc._type = C.libxl_domain_type(x.Type)
switch x.Type{
case DomainTypeHvm:
-tmp, ok := x.TypeUnion.(DomainBuildInfoTypeUnionHvm)
+tmp, ok := x.TypeUnion.(*DomainBuildInfoTypeUnionHvm)
if !ok {
return errors.New("wrong type for union key type")
}
@@ -1545,7 +1545,7 @@ hvm.mca_caps = C.uint64_t(tmp.McaCaps)
hvmBytes :=
C.GoBytes(unsafe.Pointer(&hvm),C.sizeof_libxl_domain_build_info_type_union_hvm)
copy(xc.u[:],hvmBytes)
case DomainTypePv:
-tmp, ok := x.TypeUnion.(DomainBuildInfoTypeUnionPv)
+tmp, ok := x.TypeUnion.(*DomainBuildInfoTypeUnionPv)
if !ok {
return errors.New("wrong type for union key type")
}
@@ -1570,7 +1570,7 @@ return fmt.Errorf("converting field E820Host: %v", err)
pvBytes :=
C.GoBytes(unsafe.Pointer(&pv),C.sizeof_libxl_domain_build_info_type_union_pv)
copy(xc.u[:],pvBytes)
case DomainTypePvh:
-tmp, ok := x.TypeUnion.(DomainBuildInfoTypeUnionPvh)
+tmp, ok := x.TypeUnion.(*DomainBuildInfoTypeUnionPvh)
if !ok {
return errors.New("wrong type for union key type")
}
@@ -2157,7 +2157,7 @@ var typeHostdev DeviceUsbdevTypeUnionHostdev
if err := typeHostdev.fromC(xc);err != nil {
return fmt.Errorf("converting field typeHostdev: %v", err)
}
-x.TypeUnion = typeHostdev
+x.TypeUnion = &typeHostdev
default:
return fmt.Errorf("invalid union key '%v'", x.Type)}
@@ -2184,7 +2184,7 @@ xc.port = C.int(x.Port)
xc._type = C.libxl_usbdev_type(x.Type)
switch x.Type{
case UsbdevTypeHostdev:
-tmp, ok := x.TypeUnion.(DeviceUsbdevTypeUnionHostdev)
+tmp, ok := x.TypeUnion.(*DeviceUsbdevTypeUnionHostdev)
if !ok {
return errors.New("wrong type for union key type")
}
@@ -2375,7 +2375,7 @@ var connectionSocket DeviceChannelConnectionUnionSocket
if err := connectionSocket.fromC(xc);err != nil {
return fmt.Errorf("converting field connectionSocket: %v", err)
}
-x.ConnectionUnion = connectionSocket
+x.ConnectionUnion = &connectionSocket
case ChannelConnectionUnknown:
x.ConnectionUnion = nil
default:
@@ -2411,7 +2411,7 @@ break
case ChannelConnectionPty:
break
case ChannelConnectionSocket:
-tmp, ok := x.ConnectionUnion.(DeviceChannelConnectionUnionSocket)
+tmp, ok := x.ConnectionUnion.(*DeviceChannelConnectionUnionSocket)
if !ok {
return errors.New("wrong type for union key connection")
}
@@ -3948,7 +3948,7 @@ var typeDiskEject EventTypeUnionDiskEject
if err := typeDiskEject.fromC(xc);err != nil {
return fmt.Errorf("converting field typeDiskEject: %v", err)
}
-x.TypeUnion = typeDiskEject
+x.TypeUnion = &typeDiskEject
case EventTypeDomainCreateConsoleAvailable:
x.TypeUnion = nil
case EventTypeDomainDeath:
@@ -3958,13 +3958,13 @@ var typeDomainShutdown EventTypeUnionDomainShutdown
if err := typeDomainShutdown.fromC(xc);err != nil {
return fmt.Errorf("converting field typeDomainShutdown: %v", err)
}
-x.TypeUnion = typeDomainShutdown
+x.TypeUnion = &typeDomainShutdown
case EventTypeOperationComplete:
var typeOperationComplete EventTypeUnionOperationComplete
if err := typeOperationComplete.fromC(xc);err != nil {
return fmt.Errorf("converting field typeOperationComplete: %v", err)
}
-x.TypeUnion = typeOperationComplete
+x.TypeUnion = &typeOperationComplete
default:
return fmt.Errorf("invalid union key '%v'", x.Type)}
@@ -4019,7 +4019,7 @@ xc.for_user = C.uint64_t(x.ForUser)
xc._type = C.libxl_event_type(x.Type)
switch x.Type{
case EventTypeDomainShutdown:
-tmp, ok := x.TypeUnion.(EventTypeUnionDomainShutdown)
+tmp, ok := x.TypeUnion.(*EventTypeUnionDomainShutdown)
if !ok {
return errors.New("wrong type for union key type")
}
@@ -4030,7 +4030,7 @@ copy(xc.u[:],domain_shutdownBytes)
case EventTypeDomainDeath:
break
case EventTypeDiskEject:
-tmp, ok := x.TypeUnion.(EventTypeUnionDiskEject)
+tmp, ok := x.TypeUnion.(*EventTypeUnionDiskEject)
if !ok {
return errors.New("wrong type for union key type")
}
@@ -4043,7 +4043,7 @@ return fmt.Errorf("converting field Disk: %v", err)
disk_ejectBytes :=
C.GoBytes(unsafe.Pointer(&disk_eject),C.sizeof_libxl_event_type_union_disk_eject)
copy(xc.u[:],disk_ejectBytes)
case EventTypeOperationComplete:
-tmp, ok := x.TypeUnion.(EventTypeUnionOperationComplete)
+tmp, ok := x.TypeUnion.(*EventTypeUnionOperationComplete)
if !ok {
return errors.New("wrong type for union key type")
}
@@ -4118,13 +4118,13 @@ var typeCat PsrHwInfoTypeUnionCat
if err := typeCat.fromC(xc);err != nil {
return fmt.Errorf("converting field typeCat: %v", err)
}
-x.TypeUnion = typeCat
+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
+x.TypeUnion = &typeMba
default:
return fmt.Errorf("invalid union key '%v'", x.Type)}
@@ -4163,7 +4163,7 @@ xc.id = C.uint32_t(x.Id)
xc._type = C.libxl_psr_feat_type(x.Type)
switch x.Type{
case PsrFeatTypeCat:
-tmp, ok := x.TypeUnion.(PsrHwInfoTypeUnionCat)
+tmp, ok := x.TypeUnion.(*PsrHwInfoTypeUnionCat)
if !ok {
return errors.New("wrong type for union key type")
}
@@ -4174,7 +4174,7 @@ cat.cdp_enabled = C.bool(tmp.CdpEnabled)
catBytes :=
C.GoBytes(unsafe.Pointer(&cat),C.sizeof_libxl_psr_hw_info_type_union_cat)
copy(xc.u[:],catBytes)
case PsrFeatTypeMba:
-tmp, ok := x.TypeUnion.(PsrHwInfoTypeUnionMba)
+tmp, ok := x.TypeUnion.(*PsrHwInfoTypeUnionMba)
if !ok {
return errors.New("wrong type for union key type")
}
--
generated by git-patchbot for /home/xen/git/xen.git#staging
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