5fbc78dd36
Flat union branch names match the tag enum's member names. Omitted branches default to "no members for this tag value". Branch names starting with a digit get rejected like "'data' member '0' has an invalid name". However, omitting the branch works. This is because flat union tag values get checked twice: as enum member name, and as union branch name. The former accepts leading digits, the latter doesn't. Branches whose names start with a digit therefore cannot have members. Feels wrong. Get rid of the restriction by skipping the latter check. This can expose c_name() to input it can't handle: a name starting with a digit. Improve it to return a valid C identifier for any input. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20210323094025.3569441-9-armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> [Commit message rewritten]
370 lines
12 KiB
Python
370 lines
12 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Check (context-free) QAPI schema expression structure
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#
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# Copyright IBM, Corp. 2011
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# Copyright (c) 2013-2019 Red Hat Inc.
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#
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# Authors:
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# Anthony Liguori <aliguori@us.ibm.com>
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# Markus Armbruster <armbru@redhat.com>
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# Eric Blake <eblake@redhat.com>
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# Marc-André Lureau <marcandre.lureau@redhat.com>
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#
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# This work is licensed under the terms of the GNU GPL, version 2.
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# See the COPYING file in the top-level directory.
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from collections import OrderedDict
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import re
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from .common import c_name
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from .error import QAPISemError
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# Names must be letters, numbers, -, and _. They must start with letter,
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# except for downstream extensions which must start with __RFQDN_.
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# Dots are only valid in the downstream extension prefix.
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valid_name = re.compile(r'^(__[a-zA-Z0-9.-]+_)?'
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'[a-zA-Z][a-zA-Z0-9_-]*$')
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def check_name_is_str(name, info, source):
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if not isinstance(name, str):
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raise QAPISemError(info, "%s requires a string name" % source)
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def check_name_str(name, info, source,
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enum_member=False,
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permit_upper=False):
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membername = name
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# Enum members can start with a digit, because the generated C
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# code always prefixes it with the enum name
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if enum_member and membername[0].isdigit():
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membername = 'D' + membername
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# Reserve the entire 'q_' namespace for c_name(), and for 'q_empty'
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# and 'q_obj_*' implicit type names.
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if not valid_name.match(membername) or \
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c_name(membername, False).startswith('q_'):
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raise QAPISemError(info, "%s has an invalid name" % source)
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if not permit_upper and name.lower() != name:
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raise QAPISemError(
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info, "%s uses uppercase in name" % source)
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def check_defn_name_str(name, info, meta):
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check_name_str(name, info, meta, permit_upper=True)
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if name.endswith('Kind') or name.endswith('List'):
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raise QAPISemError(
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info, "%s name should not end in '%s'" % (meta, name[-4:]))
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def check_keys(value, info, source, required, optional):
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def pprint(elems):
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return ', '.join("'" + e + "'" for e in sorted(elems))
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missing = set(required) - set(value)
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if missing:
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raise QAPISemError(
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info,
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"%s misses key%s %s"
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% (source, 's' if len(missing) > 1 else '',
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pprint(missing)))
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allowed = set(required + optional)
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unknown = set(value) - allowed
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if unknown:
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raise QAPISemError(
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info,
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"%s has unknown key%s %s\nValid keys are %s."
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% (source, 's' if len(unknown) > 1 else '',
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pprint(unknown), pprint(allowed)))
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def check_flags(expr, info):
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for key in ['gen', 'success-response']:
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if key in expr and expr[key] is not False:
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raise QAPISemError(
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info, "flag '%s' may only use false value" % key)
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for key in ['boxed', 'allow-oob', 'allow-preconfig', 'coroutine']:
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if key in expr and expr[key] is not True:
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raise QAPISemError(
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info, "flag '%s' may only use true value" % key)
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if 'allow-oob' in expr and 'coroutine' in expr:
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# This is not necessarily a fundamental incompatibility, but
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# we don't have a use case and the desired semantics isn't
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# obvious. The simplest solution is to forbid it until we get
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# a use case for it.
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raise QAPISemError(info, "flags 'allow-oob' and 'coroutine' "
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"are incompatible")
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def check_if(expr, info, source):
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def check_if_str(ifcond, info):
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if not isinstance(ifcond, str):
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raise QAPISemError(
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info,
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"'if' condition of %s must be a string or a list of strings"
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% source)
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if ifcond.strip() == '':
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raise QAPISemError(
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info,
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"'if' condition '%s' of %s makes no sense"
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% (ifcond, source))
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ifcond = expr.get('if')
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if ifcond is None:
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return
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if isinstance(ifcond, list):
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if ifcond == []:
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raise QAPISemError(
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info, "'if' condition [] of %s is useless" % source)
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for elt in ifcond:
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check_if_str(elt, info)
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else:
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check_if_str(ifcond, info)
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expr['if'] = [ifcond]
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def normalize_members(members):
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if isinstance(members, OrderedDict):
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for key, arg in members.items():
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if isinstance(arg, dict):
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continue
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members[key] = {'type': arg}
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def check_type(value, info, source,
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allow_array=False, allow_dict=False):
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if value is None:
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return
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# Array type
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if isinstance(value, list):
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if not allow_array:
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raise QAPISemError(info, "%s cannot be an array" % source)
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if len(value) != 1 or not isinstance(value[0], str):
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raise QAPISemError(info,
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"%s: array type must contain single type name" %
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source)
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return
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# Type name
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if isinstance(value, str):
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return
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# Anonymous type
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if not allow_dict:
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raise QAPISemError(info, "%s should be a type name" % source)
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if not isinstance(value, OrderedDict):
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raise QAPISemError(info,
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"%s should be an object or type name" % source)
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permit_upper = allow_dict in info.pragma.name_case_whitelist
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# value is a dictionary, check that each member is okay
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for (key, arg) in value.items():
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key_source = "%s member '%s'" % (source, key)
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if key.startswith('*'):
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key = key[1:]
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check_name_str(key, info, key_source,
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permit_upper=permit_upper)
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if c_name(key, False) == 'u' or c_name(key, False).startswith('has_'):
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raise QAPISemError(info, "%s uses reserved name" % key_source)
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check_keys(arg, info, key_source, ['type'], ['if', 'features'])
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check_if(arg, info, key_source)
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check_features(arg.get('features'), info)
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check_type(arg['type'], info, key_source, allow_array=True)
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def check_features(features, info):
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if features is None:
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return
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if not isinstance(features, list):
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raise QAPISemError(info, "'features' must be an array")
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features[:] = [f if isinstance(f, dict) else {'name': f}
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for f in features]
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for f in features:
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source = "'features' member"
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assert isinstance(f, dict)
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check_keys(f, info, source, ['name'], ['if'])
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check_name_is_str(f['name'], info, source)
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source = "%s '%s'" % (source, f['name'])
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check_name_str(f['name'], info, source)
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check_if(f, info, source)
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def check_enum(expr, info):
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name = expr['enum']
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members = expr['data']
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prefix = expr.get('prefix')
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if not isinstance(members, list):
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raise QAPISemError(info, "'data' must be an array")
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if prefix is not None and not isinstance(prefix, str):
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raise QAPISemError(info, "'prefix' must be a string")
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permit_upper = name in info.pragma.name_case_whitelist
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members[:] = [m if isinstance(m, dict) else {'name': m}
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for m in members]
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for member in members:
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source = "'data' member"
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check_keys(member, info, source, ['name'], ['if'])
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check_name_is_str(member['name'], info, source)
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source = "%s '%s'" % (source, member['name'])
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check_name_str(member['name'], info, source,
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enum_member=True, permit_upper=permit_upper)
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check_if(member, info, source)
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def check_struct(expr, info):
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name = expr['struct']
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members = expr['data']
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check_type(members, info, "'data'", allow_dict=name)
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check_type(expr.get('base'), info, "'base'")
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def check_union(expr, info):
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name = expr['union']
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base = expr.get('base')
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discriminator = expr.get('discriminator')
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members = expr['data']
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if discriminator is None: # simple union
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if base is not None:
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raise QAPISemError(info, "'base' requires 'discriminator'")
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else: # flat union
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check_type(base, info, "'base'", allow_dict=name)
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if not base:
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raise QAPISemError(info, "'discriminator' requires 'base'")
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check_name_is_str(discriminator, info, "'discriminator'")
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for (key, value) in members.items():
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source = "'data' member '%s'" % key
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if discriminator is None:
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check_name_str(key, info, source)
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# else: name is in discriminator enum, which gets checked
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check_keys(value, info, source, ['type'], ['if'])
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check_if(value, info, source)
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check_type(value['type'], info, source, allow_array=not base)
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def check_alternate(expr, info):
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members = expr['data']
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if not members:
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raise QAPISemError(info, "'data' must not be empty")
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for (key, value) in members.items():
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source = "'data' member '%s'" % key
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check_name_str(key, info, source)
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check_keys(value, info, source, ['type'], ['if'])
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check_if(value, info, source)
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check_type(value['type'], info, source)
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def check_command(expr, info):
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args = expr.get('data')
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rets = expr.get('returns')
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boxed = expr.get('boxed', False)
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if boxed and args is None:
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raise QAPISemError(info, "'boxed': true requires 'data'")
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check_type(args, info, "'data'", allow_dict=not boxed)
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check_type(rets, info, "'returns'", allow_array=True)
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def check_event(expr, info):
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args = expr.get('data')
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boxed = expr.get('boxed', False)
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if boxed and args is None:
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raise QAPISemError(info, "'boxed': true requires 'data'")
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check_type(args, info, "'data'", allow_dict=not boxed)
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def check_exprs(exprs):
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for expr_elem in exprs:
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expr = expr_elem['expr']
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info = expr_elem['info']
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doc = expr_elem.get('doc')
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if 'include' in expr:
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continue
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if 'enum' in expr:
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meta = 'enum'
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elif 'union' in expr:
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meta = 'union'
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elif 'alternate' in expr:
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meta = 'alternate'
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elif 'struct' in expr:
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meta = 'struct'
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elif 'command' in expr:
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meta = 'command'
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elif 'event' in expr:
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meta = 'event'
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else:
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raise QAPISemError(info, "expression is missing metatype")
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name = expr[meta]
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check_name_is_str(name, info, "'%s'" % meta)
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info.set_defn(meta, name)
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check_defn_name_str(name, info, meta)
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if doc:
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if doc.symbol != name:
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raise QAPISemError(
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info, "documentation comment is for '%s'" % doc.symbol)
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doc.check_expr(expr)
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elif info.pragma.doc_required:
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raise QAPISemError(info,
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"documentation comment required")
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if meta == 'enum':
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check_keys(expr, info, meta,
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['enum', 'data'], ['if', 'features', 'prefix'])
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check_enum(expr, info)
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elif meta == 'union':
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check_keys(expr, info, meta,
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['union', 'data'],
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['base', 'discriminator', 'if', 'features'])
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normalize_members(expr.get('base'))
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normalize_members(expr['data'])
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check_union(expr, info)
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elif meta == 'alternate':
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check_keys(expr, info, meta,
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['alternate', 'data'], ['if', 'features'])
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normalize_members(expr['data'])
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check_alternate(expr, info)
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elif meta == 'struct':
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check_keys(expr, info, meta,
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['struct', 'data'], ['base', 'if', 'features'])
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normalize_members(expr['data'])
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check_struct(expr, info)
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elif meta == 'command':
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check_keys(expr, info, meta,
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['command'],
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['data', 'returns', 'boxed', 'if', 'features',
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'gen', 'success-response', 'allow-oob',
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'allow-preconfig', 'coroutine'])
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normalize_members(expr.get('data'))
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check_command(expr, info)
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elif meta == 'event':
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check_keys(expr, info, meta,
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['event'], ['data', 'boxed', 'if', 'features'])
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normalize_members(expr.get('data'))
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check_event(expr, info)
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else:
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assert False, 'unexpected meta type'
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check_if(expr, info, meta)
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check_features(expr.get('features'), info)
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check_flags(expr, info)
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return exprs
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