mirror of
https://gitlab.com/libvirt/libvirt.git
synced 2025-01-14 16:45:20 +00:00
8c618e17d1
PEP 8 says:
"Comparisons to singletons like None should always be done
with 'is' or 'is not', never the equality operators."
There are potentially semantics differences, though in the case of this
libvirt code its merely a style change:
http://jaredgrubb.blogspot.com/2009/04/python-is-none-vs-none.html
Reviewed-by: John Ferlan <jferlan@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
519 lines
17 KiB
Python
Executable File
519 lines
17 KiB
Python
Executable File
#!/usr/bin/env python
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#
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# hyperv_wmi_generator.py: generates most of the WMI type mapping code
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#
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# Copyright (C) 2011 Matthias Bolte <matthias.bolte@googlemail.com>
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library. If not, see
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# <http://www.gnu.org/licenses/>.
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#
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from __future__ import print_function
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import sys
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import os
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import os.path
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separator = "/*" + ("*" * 50) + "*\n"
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wmi_version_separator = "/"
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wmi_classes_by_name = {}
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class WmiClass:
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"""Represents WMI class and provides methods to generate C code.
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This class holds one or more instances of WmiClassVersion because with the
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Windows 2012 release, Microsoft introduced "v2" version of Msvm_* family of
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classes that need different URI for making wsman requests and also have
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some additional/changed properties (though many of the properties are the
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same as in "v1". Therefore, this class makes sure that C code is generated
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for each of them while avoiding name conflicts, identifies common members,
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and defined *_WmiInfo structs holding info about each version so the driver
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code can make the right choices based on which Hyper-V host it's connected
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to.
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"""
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def __init__(self, name, versions=None):
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self.name = name
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self.versions = versions if versions else list()
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self.common = None
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def prepare(self):
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"""Prepares the class for code generation
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Makes sure that "versioned" classes are sorted by version, identifies
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common properties and ensures that they are aligned by name and
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type in each version
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"""
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# sort versioned classes by version in case input file did not have them
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# in order
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self.versions = sorted(self.versions, key=lambda cls: cls.version or "")
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# if there's more than one version make sure first one has name suffixed
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# because we'll generate "common" member and will be the "base" name
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if len(self.versions) > 1:
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first = self.versions[0]
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if first.version is None:
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first.version = "v1"
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first.name = "%s_%s" % (first.name, first.version)
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# finally, identify common members in all versions and make sure they
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# are in the same order - to ensure C struct member alignment
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self._align_property_members()
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def generate_classes_header(self):
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"""Generate C header code and return it as string
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Declares:
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<class_name>_Data - used as one of hypervObject->data members
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<class_name>_TypeInfo - used as wsman XmlSerializerInfo
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<class_name> - "inherits" hypervObject struct
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"""
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name_upper = self.name.upper()
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header = separator
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header += " * %s\n" % self.name
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header += " */\n"
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header += "\n"
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header += "#define %s_CLASSNAME \\\n" % name_upper
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header += " \"%s\"\n" % self.name
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header += "\n"
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header += "#define %s_WQL_SELECT \\\n" % name_upper
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header += " \"SELECT * FROM %s \"\n" % self.name
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header += "\n"
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header += "extern hypervWmiClassInfoListPtr %s_WmiInfo;\n\n" % self.name
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header += self._declare_data_structs()
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header += self._declare_hypervObject_struct()
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return header
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def generate_classes_source(self):
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"""Returns a C code string defining wsman data structs
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Defines:
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<class_name>_Data structs
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<class_name>_WmiInfo - list holding metadata (e.g. request URIs) for
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each known version of WMI class.
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"""
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source = separator
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source += " * %s\n" % self.name
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source += " */\n"
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for cls in self.versions:
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source += "SER_START_ITEMS(%s_Data)\n" % cls.name
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for property in cls.properties:
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source += property.generate_classes_source(cls.name)
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source += "SER_END_ITEMS(%s_Data);\n\n" % cls.name
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# also generate typemap data while we're here
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source += "hypervCimType %s_Typemap[] = {\n" % cls.name
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for property in cls.properties:
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source += property.generate_typemap()
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source += ' { "", "", 0 },\n' # null terminated
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source += '};\n\n'
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source += self._define_WmiInfo_struct()
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source += "\n\n"
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return source
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def generate_classes_typedef(self):
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"""Returns C string for typdefs"""
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typedef = "typedef struct _%s %s;\n" % (self.name, self.name)
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if self.common is not None:
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typedef += "typedef struct _%s_Data %s_Data;\n" % (self.name, self.name)
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for cls in self.versions:
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typedef += "typedef struct _%s_Data %s_Data;\n" % (cls.name, cls.name)
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return typedef
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def _declare_data_structs(self):
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"""Returns string C code declaring data structs.
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The *_Data structs are members of hypervObject data union. Each one has
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corresponding *_TypeInfo that is used for wsman unserialization of
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response XML into the *_Data structs. If there's a "common" member, it
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won't have corresponding *_TypeInfo because this is a special case only
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used to provide a common "view" of v1, v2 etc members
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"""
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header = ""
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if self.common is not None:
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header += "struct _%s_Data {\n" % self.name
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for property in self.common:
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header += property.generate_classes_header()
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header += "};\n\n"
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# Declare actual data struct for each versions
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for cls in self.versions:
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header += "#define %s_RESOURCE_URI \\\n" % cls.name.upper()
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header += " \"%s\"\n" % cls.uri_info.resourceUri
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header += "\n"
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header += "struct _%s_Data {\n" % cls.name
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for property in cls.properties:
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header += property.generate_classes_header()
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header += "};\n\n"
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header += "SER_DECLARE_TYPE(%s_Data);\n" % cls.name
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return header
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def _declare_hypervObject_struct(self):
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"""Return string for C code declaring hypervObject instance"""
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header = "\n/* must match hypervObject */\n"
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header += "struct _%s {\n" % self.name
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header += " union {\n"
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# if there's common use it as "common" else first and only version is
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# the "common" member
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if self.common is not None:
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header += " %s_Data *common;\n" % self.name
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else:
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header += " %s_Data *common;\n" % self.versions[0].name
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for cls in self.versions:
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header += " %s_Data *%s;\n" % (cls.name, cls.version)
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header += " } data;\n"
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header += " hypervWmiClassInfoPtr info;\n"
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header += " %s *next;\n" % self.name
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header += "};\n"
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header += "\n\n\n"
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return header
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def _define_WmiInfo_struct(self):
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"""Return string for C code defining *_WmiInfo struct
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Those structs hold info with meta-data needed to make wsman requests for
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each version of WMI class
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"""
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source = "hypervWmiClassInfoListPtr %s_WmiInfo = &(hypervWmiClassInfoList) {\n" % self.name
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source += " .count = %d,\n" % len(self.versions)
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source += " .objs = (hypervWmiClassInfoPtr []) {\n"
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for cls in self.versions:
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source += " &(hypervWmiClassInfo) {\n"
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source += " .name = %s_CLASSNAME,\n" % self.name.upper()
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if cls.version is not None:
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source += " .version = \"%s\",\n" % cls.version
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else:
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source += " .version = NULL,\n"
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source += " .rootUri = %s,\n" % cls.uri_info.rootUri
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source += " .resourceUri = %s_RESOURCE_URI,\n" % cls.name.upper()
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source += " .serializerInfo = %s_Data_TypeInfo,\n" % cls.name
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source += " .propertyInfo = %s_Typemap\n" % cls.name
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source += " },\n"
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source += " }\n"
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source += "};\n"
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return source
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def _align_property_members(self):
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"""Identifies common properties in all class versions.
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Makes sure that properties in all versions are ordered with common
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members first and that they are in the same order. This makes the
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generated C structs memory aligned and safe to access via the "common"
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struct that "shares" members with v1, v2 etc.
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"""
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num_classes = len(self.versions)
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common = {}
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property_info = {}
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if num_classes < 2:
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return
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# count property occurrences in all class versions
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for cls in self.versions:
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for prop in cls.properties:
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# consdered same if matches by name AND type
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key = "%s_%s_%s" % (prop.name, prop.type, prop.is_array)
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if key in property_info:
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property_info[key][1] += 1
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else:
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property_info[key] = [prop, 1]
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# isolate those that are common for all and keep track of their positions
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pos = 0
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for key in sorted(property_info):
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info = property_info[key]
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# exists in all class versions
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if info[1] == num_classes:
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common[info[0].name] = [info[0], pos]
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pos += 1
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# alter each version's property list so that common members are first
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# and in the same order as in the common dictionary
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for cls in self.versions:
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index = 0
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count = len(cls.properties)
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while index < count:
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prop = cls.properties[index]
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# it's a "common" property
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if prop.name in common:
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pos = common[prop.name][1]
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# move to the same position as in "common" dictionary
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if index != pos:
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tmp = cls.properties[pos]
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cls.properties[pos] = prop
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cls.properties[index] = tmp
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else:
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index += 1
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else:
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index += 1
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# finally, get common properties as list sorted by position in dictionary
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tmp = sorted(common.values(), key=lambda x: x[1])
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self.common = []
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for x in tmp:
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self.common.append(x[0])
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class ClassUriInfo:
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"""Prepares URI information needed for wsman requests."""
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def __init__(self, wmi_name, version):
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self.rootUri = "ROOT_CIMV2"
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self.resourceUri = None
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baseUri = "http://schemas.microsoft.com/wbem/wsman/1/wmi/root/cimv2"
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if wmi_name.startswith("Msvm_"):
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baseUri = "http://schemas.microsoft.com/wbem/wsman/1/wmi/root/virtualization"
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self.rootUri = "ROOT_VIRTUALIZATION"
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if version == "v2":
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baseUri += "/v2"
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self.rootUri = "ROOT_VIRTUALIZATION_V2"
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self.resourceUri = "%s/%s" % (baseUri, wmi_name)
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class WmiClassVersion:
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"""Represents specific version of WMI class."""
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def __init__(self, name, version, properties, uri_info):
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self.name = name
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self.version = version
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self.properties = properties
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self.uri_info = uri_info
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class Property:
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typemap = {
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"boolean": "BOOL",
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"string": "STR",
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"datetime": "STR",
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"int8": "INT8",
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"sint8": "INT8",
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"int16": "INT16",
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"sint16": "INT16",
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"int32": "INT32",
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"sint32": "INT32",
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"int64": "INT64",
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"sint64": "INT64",
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"uint8": "UINT8",
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"uint16": "UINT16",
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"uint32": "UINT32",
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"uint64": "UINT64"
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}
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def __init__(self, type, name, is_array):
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if type not in Property.typemap:
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report_error("unhandled property type %s" % type)
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self.type = type
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self.name = name
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self.is_array = is_array
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def generate_classes_header(self):
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if self.is_array:
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return " XML_TYPE_DYN_ARRAY %s;\n" % self.name
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else:
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return " XML_TYPE_%s %s;\n" \
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% (Property.typemap[self.type], self.name)
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def generate_classes_source(self, class_name):
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if self.is_array:
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return " SER_NS_DYN_ARRAY(%s_RESOURCE_URI, \"%s\", 0, 0, %s),\n" \
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% (class_name.upper(), self.name, self.type)
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else:
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return " SER_NS_%s(%s_RESOURCE_URI, \"%s\", 1),\n" \
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% (Property.typemap[self.type], class_name.upper(), self.name)
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def generate_typemap(self):
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return ' { "%s", "%s", %s },\n' % (self.name, self.type.lower(), str(self.is_array).lower())
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def open_and_print(filename):
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if filename.startswith("./"):
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print(" GEN " + filename[2:])
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else:
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print(" GEN " + filename)
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return open(filename, "wt")
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def report_error(message):
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print("error: " + message)
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sys.exit(1)
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def parse_class(block):
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# expected format: class <name>
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header_items = block[0][1].split()
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if len(header_items) != 2:
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report_error("line %d: invalid block header" % (number))
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assert header_items[0] == "class"
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name = header_items[1]
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properties = []
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version = None
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wmi_name = name
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ns_separator = name.find(wmi_version_separator)
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if ns_separator != -1:
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version = name[:ns_separator]
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wmi_name = name[ns_separator + 1:]
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name = "%s_%s" % (wmi_name, version)
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for line in block[1:]:
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# expected format: <type> <name>
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items = line[1].split()
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if len(items) != 2:
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report_error("line %d: invalid property" % line[0])
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if items[1].endswith("[]"):
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items[1] = items[1][:-2]
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is_array = True
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else:
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is_array = False
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properties.append(Property(type=items[0], name=items[1],
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is_array=is_array))
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cls = WmiClassVersion(name=name, version=version, properties=properties,
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uri_info=ClassUriInfo(wmi_name, version))
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if wmi_name in wmi_classes_by_name:
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wmi_classes_by_name[wmi_name].versions.append(cls)
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else:
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wmi_classes_by_name[wmi_name] = WmiClass(wmi_name, [cls])
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def main():
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if "srcdir" in os.environ:
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input_filename = os.path.join(os.environ["srcdir"], "hyperv/hyperv_wmi_generator.input")
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output_dirname = os.path.join(os.environ["srcdir"], "hyperv")
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else:
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input_filename = os.path.join(os.getcwd(), "hyperv_wmi_generator.input")
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output_dirname = os.getcwd()
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classes_typedef = open_and_print(os.path.join(output_dirname, "hyperv_wmi_classes.generated.typedef"))
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classes_header = open_and_print(os.path.join(output_dirname, "hyperv_wmi_classes.generated.h"))
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classes_source = open_and_print(os.path.join(output_dirname, "hyperv_wmi_classes.generated.c"))
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# parse input file
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number = 0
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block = None
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for line in open(input_filename, "rt").readlines():
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number += 1
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if "#" in line:
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line = line[:line.index("#")]
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line = line.lstrip().rstrip()
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if len(line) < 1:
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continue
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if line.startswith("class"):
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if block is not None:
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report_error("line %d: nested block found" % (number))
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else:
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block = []
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if block is not None:
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if line == "end":
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if block[0][1].startswith("class"):
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parse_class(block)
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block = None
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else:
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block.append((number, line))
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# write output files
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notice = "/* Generated by hyperv_wmi_generator.py */\n\n\n\n"
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classes_typedef.write(notice)
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classes_header.write(notice)
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classes_source.write(notice)
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names = sorted(wmi_classes_by_name.keys())
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for name in names:
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cls = wmi_classes_by_name[name]
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cls.prepare()
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classes_typedef.write(cls.generate_classes_typedef())
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classes_header.write(cls.generate_classes_header())
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classes_source.write(cls.generate_classes_source())
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if __name__ == "__main__":
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main()
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