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build: make it easier to backport event ids

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In some cases, it is very easy for downstream distros to backport
enum values without requiring a .so bump.  Keying the conditional
code off of the upstream version where the enum value was added
is not ideal, because downstream then has to patch that the feature
is available in their build that still reports an earlier version
number.  For example, if RHEL 7 backports events from 1.2.11 into
a build based on 1.2.8, building the python bindings would warn:

libvirt-override.c: In function ‘libvirt_virConnectDomainEventRegisterAny’:
libvirt-override.c:6653:5: warning: enumeration value ‘VIR_DOMAIN_EVENT_ID_TUNABLE’ not handled in switch [-Wswitch]
     switch ((virDomainEventID) eventID) {
          ^
	  libvirt-override.c:6653:5: warning: enumeration value ‘VIR_DOMAIN_EVENT_ID_AGENT_LIFECYCLE’ not handled in switch [-Wswitch]

The solution is simple - use feature-based probes instead of
version probes.  Since we already scrape the XML API document of
whatever libvirt build we are binding, and that XML already
documents any downstream enum additions, we can use those as the
features for gating conditional compilation.

* generator.py (enum): Track event id names.
(buildStubs): Output define wrappers for events.
* libvirt-override.c
(libvirt_virConnectDomainEventBalloonChangeCallback)
(libvirt_virConnectDomainEventPMSuspendDiskCallback)
(libvirt_virConnectDomainEventDeviceRemovedCallback)
(libvirt_virConnectDomainEventTunableCallback)
(libvirt_virConnectDomainEventAgentLifecycleCallback)
(libvirt_virConnectDomainEventRegisterAny): Use them.

Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Eric Blake
2015-01-14 19:57:42 -07:00
parent 1598bd7dd5
commit ab6eb69f8d
2 changed files with 33 additions and 25 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
generator.py
View File

@ -9,6 +9,7 @@ qemu_functions = {}
enums = {} # { enumType: { enumConstant: enumValue } } enums = {} # { enumType: { enumConstant: enumValue } }
lxc_enums = {} # { enumType: { enumConstant: enumValue } } lxc_enums = {} # { enumType: { enumConstant: enumValue } }
qemu_enums = {} # { enumType: { enumConstant: enumValue } } qemu_enums = {} # { enumType: { enumConstant: enumValue } }
event_ids = []
import os import os
import sys import sys
@ -219,6 +220,9 @@ def lxc_function(name, desc, ret, args, file, module, cond):
def enum(type, name, value): def enum(type, name, value):
if type not in enums: if type not in enums:
enums[type] = {} enums[type] = {}
if (name.startswith('VIR_DOMAIN_EVENT_ID_') or
name.startswith('VIR_NETWORK_EVENT_ID_')):
event_ids.append(name)
if value == 'VIR_TYPED_PARAM_INT': if value == 'VIR_TYPED_PARAM_INT':
value = 1 value = 1
elif value == 'VIR_TYPED_PARAM_UINT': elif value == 'VIR_TYPED_PARAM_UINT':
@ -910,10 +914,10 @@ def buildStubs(module, api_xml):
wrapper_file = "build/%s.c" % module wrapper_file = "build/%s.c" % module
include = open(header_file, "w") include = open(header_file, "w")
include.write("/* Generated */\n\n") include.write("/* Generated by generator.py */\n\n")
export = open(export_file, "w") export = open(export_file, "w")
export.write("/* Generated */\n\n") export.write("/* Generated by generator.py */\n\n")
wrapper = open(wrapper_file, "w") wrapper = open(wrapper_file, "w")
wrapper.write("/* Generated by generator.py */\n\n") wrapper.write("/* Generated by generator.py */\n\n")
@ -943,6 +947,10 @@ def buildStubs(module, api_xml):
# Write C pointer conversion functions. # Write C pointer conversion functions.
for classname in primary_classes: for classname in primary_classes:
print_c_pointer(classname, wrapper, export, include) print_c_pointer(classname, wrapper, export, include)
# Write define wrappers around event id enums, so that the
# preprocessor can see which enums were available.
for event_id in event_ids:
include.write("#define %s %s\n" % (event_id, event_id))
include.close() include.close()
export.close() export.close()

46
libvirt-override.c
View File

@ -4,7 +4,7 @@
* entry points where an automatically generated stub is * entry points where an automatically generated stub is
* unpractical * unpractical
* *
* Copyright (C) 2005, 2007-2014 Red Hat, Inc. * Copyright (C) 2005, 2007-2015 Red Hat, Inc.
* *
* Daniel Veillard <veillard@redhat.com> * Daniel Veillard <veillard@redhat.com>
*/ */
@ -6346,7 +6346,7 @@ libvirt_virConnectDomainEventPMSuspendCallback(virConnectPtr conn ATTRIBUTE_UNUS
} }
#if LIBVIR_CHECK_VERSION(0, 10, 0) #ifdef VIR_DOMAIN_EVENT_ID_BALLOON_CHANGE
static int static int
libvirt_virConnectDomainEventBalloonChangeCallback(virConnectPtr conn ATTRIBUTE_UNUSED, libvirt_virConnectDomainEventBalloonChangeCallback(virConnectPtr conn ATTRIBUTE_UNUSED,
virDomainPtr dom, virDomainPtr dom,
@ -6398,9 +6398,9 @@ libvirt_virConnectDomainEventBalloonChangeCallback(virConnectPtr conn ATTRIBUTE_
LIBVIRT_RELEASE_THREAD_STATE; LIBVIRT_RELEASE_THREAD_STATE;
return ret; return ret;
} }
#endif /* LIBVIR_CHECK_VERSION(0, 10, 0) */ #endif /* VIR_DOMAIN_EVENT_ID_BALLOON_CHANGE */
#if LIBVIR_CHECK_VERSION(1, 0, 0) #ifdef VIR_DOMAIN_EVENT_ID_PMSUSPEND_DISK
static int static int
libvirt_virConnectDomainEventPMSuspendDiskCallback(virConnectPtr conn ATTRIBUTE_UNUSED, libvirt_virConnectDomainEventPMSuspendDiskCallback(virConnectPtr conn ATTRIBUTE_UNUSED,
virDomainPtr dom, virDomainPtr dom,
@ -6452,9 +6452,9 @@ libvirt_virConnectDomainEventPMSuspendDiskCallback(virConnectPtr conn ATTRIBUTE_
LIBVIRT_RELEASE_THREAD_STATE; LIBVIRT_RELEASE_THREAD_STATE;
return ret; return ret;
} }
#endif /* LIBVIR_CHECK_VERSION(1, 0, 0) */ #endif /* VIR_DOMAIN_EVENT_ID_PMSUSPEND_DISK */
#if LIBVIR_CHECK_VERSION(1, 1, 1) #ifdef VIR_DOMAIN_EVENT_ID_DEVICE_REMOVED
static int static int
libvirt_virConnectDomainEventDeviceRemovedCallback(virConnectPtr conn ATTRIBUTE_UNUSED, libvirt_virConnectDomainEventDeviceRemovedCallback(virConnectPtr conn ATTRIBUTE_UNUSED,
virDomainPtr dom, virDomainPtr dom,
@ -6504,9 +6504,9 @@ libvirt_virConnectDomainEventDeviceRemovedCallback(virConnectPtr conn ATTRIBUTE_
LIBVIRT_RELEASE_THREAD_STATE; LIBVIRT_RELEASE_THREAD_STATE;
return ret; return ret;
} }
#endif /* LIBVIR_CHECK_VERSION(1, 1, 1) */ #endif /* VIR_DOMAIN_EVENT_ID_DEVICE_REMOVED */
#if LIBVIR_CHECK_VERSION(1, 2, 9) #ifdef VIR_DOMAIN_EVENT_ID_TUNABLE
static int static int
libvirt_virConnectDomainEventTunableCallback(virConnectPtr conn ATTRIBUTE_UNUSED, libvirt_virConnectDomainEventTunableCallback(virConnectPtr conn ATTRIBUTE_UNUSED,
virDomainPtr dom, virDomainPtr dom,
@ -6564,9 +6564,9 @@ libvirt_virConnectDomainEventTunableCallback(virConnectPtr conn ATTRIBUTE_UNUSED
return ret; return ret;
} }
#endif /* LIBVIR_CHECK_VERSION(1, 2, 9) */ #endif /* VIR_DOMAIN_EVENT_ID_TUNABLE */
#if LIBVIR_CHECK_VERSION(1, 2, 11) #ifdef VIR_DOMAIN_EVENT_ID_AGENT_LIFECYCLE
static int static int
libvirt_virConnectDomainEventAgentLifecycleCallback(virConnectPtr conn ATTRIBUTE_UNUSED, libvirt_virConnectDomainEventAgentLifecycleCallback(virConnectPtr conn ATTRIBUTE_UNUSED,
virDomainPtr dom, virDomainPtr dom,
@ -6618,7 +6618,7 @@ libvirt_virConnectDomainEventAgentLifecycleCallback(virConnectPtr conn ATTRIBUTE
return ret; return ret;
} }
#endif /* LIBVIR_CHECK_VERSION(1, 2, 11) */ #endif /* VIR_DOMAIN_EVENT_ID_AGENT_LIFECYCLE */
static PyObject * static PyObject *
@ -6676,9 +6676,9 @@ libvirt_virConnectDomainEventRegisterAny(ATTRIBUTE_UNUSED PyObject *self,
cb = VIR_DOMAIN_EVENT_CALLBACK(libvirt_virConnectDomainEventGenericCallback); cb = VIR_DOMAIN_EVENT_CALLBACK(libvirt_virConnectDomainEventGenericCallback);
break; break;
case VIR_DOMAIN_EVENT_ID_BLOCK_JOB: case VIR_DOMAIN_EVENT_ID_BLOCK_JOB:
#if LIBVIR_CHECK_VERSION(1, 2, 6) #ifdef VIR_DOMAIN_EVENT_ID_BLOCK_JOB_2
case VIR_DOMAIN_EVENT_ID_BLOCK_JOB_2: case VIR_DOMAIN_EVENT_ID_BLOCK_JOB_2:
#endif /* LIBVIR_CHECK_VERSION(1, 2, 6) */ #endif /* VIR_DOMAIN_EVENT_ID_BLOCK_JOB_2 */
cb = VIR_DOMAIN_EVENT_CALLBACK(libvirt_virConnectDomainEventBlockJobCallback); cb = VIR_DOMAIN_EVENT_CALLBACK(libvirt_virConnectDomainEventBlockJobCallback);
break; break;
case VIR_DOMAIN_EVENT_ID_DISK_CHANGE: case VIR_DOMAIN_EVENT_ID_DISK_CHANGE:
@ -6693,31 +6693,31 @@ libvirt_virConnectDomainEventRegisterAny(ATTRIBUTE_UNUSED PyObject *self,
case VIR_DOMAIN_EVENT_ID_PMSUSPEND: case VIR_DOMAIN_EVENT_ID_PMSUSPEND:
cb = VIR_DOMAIN_EVENT_CALLBACK(libvirt_virConnectDomainEventPMSuspendCallback); cb = VIR_DOMAIN_EVENT_CALLBACK(libvirt_virConnectDomainEventPMSuspendCallback);
break; break;
#if LIBVIR_CHECK_VERSION(0, 10, 0) #ifdef VIR_DOMAIN_EVENT_ID_BALLOON_CHANGE
case VIR_DOMAIN_EVENT_ID_BALLOON_CHANGE: case VIR_DOMAIN_EVENT_ID_BALLOON_CHANGE:
cb = VIR_DOMAIN_EVENT_CALLBACK(libvirt_virConnectDomainEventBalloonChangeCallback); cb = VIR_DOMAIN_EVENT_CALLBACK(libvirt_virConnectDomainEventBalloonChangeCallback);
break; break;
#endif /* LIBVIR_CHECK_VERSION(0, 10, 0) */ #endif /* VIR_DOMAIN_EVENT_ID_BALLOON_CHANGE */
#if LIBVIR_CHECK_VERSION(1, 0, 0) #ifdef VIR_DOMAIN_EVENT_ID_PMSUSPEND_DISK
case VIR_DOMAIN_EVENT_ID_PMSUSPEND_DISK: case VIR_DOMAIN_EVENT_ID_PMSUSPEND_DISK:
cb = VIR_DOMAIN_EVENT_CALLBACK(libvirt_virConnectDomainEventPMSuspendDiskCallback); cb = VIR_DOMAIN_EVENT_CALLBACK(libvirt_virConnectDomainEventPMSuspendDiskCallback);
break; break;
#endif /* LIBVIR_CHECK_VERSION(1, 0, 0) */ #endif /* VIR_DOMAIN_EVENT_ID_PMSUSPEND_DISK */
#if LIBVIR_CHECK_VERSION(1, 1, 1) #ifdef VIR_DOMAIN_EVENT_ID_DEVICE_REMOVED
case VIR_DOMAIN_EVENT_ID_DEVICE_REMOVED: case VIR_DOMAIN_EVENT_ID_DEVICE_REMOVED:
cb = VIR_DOMAIN_EVENT_CALLBACK(libvirt_virConnectDomainEventDeviceRemovedCallback); cb = VIR_DOMAIN_EVENT_CALLBACK(libvirt_virConnectDomainEventDeviceRemovedCallback);
break; break;
#endif /* LIBVIR_CHECK_VERSION(1, 1, 1) */ #endif /* VIR_DOMAIN_EVENT_ID_DEVICE_REMOVED */
#if LIBVIR_CHECK_VERSION(1, 2, 9) #ifdef VIR_DOMAIN_EVENT_ID_TUNABLE
case VIR_DOMAIN_EVENT_ID_TUNABLE: case VIR_DOMAIN_EVENT_ID_TUNABLE:
cb = VIR_DOMAIN_EVENT_CALLBACK(libvirt_virConnectDomainEventTunableCallback); cb = VIR_DOMAIN_EVENT_CALLBACK(libvirt_virConnectDomainEventTunableCallback);
break; break;
#endif /* LIBVIR_CHECK_VERSION(1, 2, 9) */ #endif /* VIR_DOMAIN_EVENT_ID_TUNABLE */
#if LIBVIR_CHECK_VERSION(1, 2, 11) #ifdef VIR_DOMAIN_EVENT_ID_AGENT_LIFECYCLE
case VIR_DOMAIN_EVENT_ID_AGENT_LIFECYCLE: case VIR_DOMAIN_EVENT_ID_AGENT_LIFECYCLE:
cb = VIR_DOMAIN_EVENT_CALLBACK(libvirt_virConnectDomainEventAgentLifecycleCallback); cb = VIR_DOMAIN_EVENT_CALLBACK(libvirt_virConnectDomainEventAgentLifecycleCallback);
break; break;
#endif /* LIBVIR_CHECK_VERSION(1, 2, 11) */ #endif /* VIR_DOMAIN_EVENT_ID_AGENT_LIFECYCLE */
case VIR_DOMAIN_EVENT_ID_LAST: case VIR_DOMAIN_EVENT_ID_LAST:
break; break;
} }