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qemu/scripts/qapi/schema.py
Daniel P. Berrangé e307a8174b qapi: provide a friendly string representation of QAPI classes 
If printing a QAPI schema object for debugging we get the classname and
a hex value for the instance:

  <qapi.schema.QAPISchemaEnumType object at 0x7f0ab4c2dad0>
  <qapi.schema.QAPISchemaObjectType object at 0x7f0ab4c2dd90>
  <qapi.schema.QAPISchemaArrayType object at 0x7f0ab4c2df90>

With this change we instead get the classname and the human friendly
name of the QAPI type instance:

  <QAPISchemaEnumType:CpuS390State at 0x7f0ab4c2dad0>
  <QAPISchemaObjectType:CpuInfoS390 at 0x7f0ab4c2dd90>
  <QAPISchemaArrayType:CpuInfoFastList at 0x7f0ab4c2df90>

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-ID: <20231018120500.2028642-1-berrange@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
[Conditional swapped to avoid negation]
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
[Tweaked to mollify pylint]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
2023-10-19 07:21:37 +02:00

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# -*- coding: utf-8 -*-
#
# QAPI schema internal representation
#
# Copyright (c) 2015-2019 Red Hat Inc.
#
# Authors:
# Markus Armbruster <armbru@redhat.com>
# Eric Blake <eblake@redhat.com>
# Marc-André Lureau <marcandre.lureau@redhat.com>
#
# This work is licensed under the terms of the GNU GPL, version 2.
# See the COPYING file in the top-level directory.
# TODO catching name collisions in generated code would be nice
from collections import OrderedDict
import os
import re
from typing import List, Optional
from .common import (
POINTER_SUFFIX,
c_name,
cgen_ifcond,
docgen_ifcond,
gen_endif,
gen_if,
)
from .error import QAPIError, QAPISemError, QAPISourceError
from .expr import check_exprs
from .parser import QAPIExpression, QAPISchemaParser
class QAPISchemaIfCond:
def __init__(self, ifcond=None):
self.ifcond = ifcond
def _cgen(self):
return cgen_ifcond(self.ifcond)
def gen_if(self):
return gen_if(self._cgen())
def gen_endif(self):
return gen_endif(self._cgen())
def docgen(self):
return docgen_ifcond(self.ifcond)
def is_present(self):
return bool(self.ifcond)
class QAPISchemaEntity:
meta: Optional[str] = None
def __init__(self, name: str, info, doc, ifcond=None, features=None):
assert name is None or isinstance(name, str)
for f in features or []:
assert isinstance(f, QAPISchemaFeature)
f.set_defined_in(name)
self.name = name
self._module = None
# For explicitly defined entities, info points to the (explicit)
# definition. For builtins (and their arrays), info is None.
# For implicitly defined entities, info points to a place that
# triggered the implicit definition (there may be more than one
# such place).
self.info = info
self.doc = doc
self._ifcond = ifcond or QAPISchemaIfCond()
self.features = features or []
self._checked = False
def __repr__(self):
if self.name is None:
return "<%s at 0x%x>" % (type(self).__name__, id(self))
return "<%s:%s at 0x%x>" % type(self).__name__, self.name, id(self)
def c_name(self):
return c_name(self.name)
def check(self, schema):
assert not self._checked
seen = {}
for f in self.features:
f.check_clash(self.info, seen)
self._checked = True
def connect_doc(self, doc=None):
doc = doc or self.doc
if doc:
for f in self.features:
doc.connect_feature(f)
def check_doc(self):
if self.doc:
self.doc.check()
def _set_module(self, schema, info):
assert self._checked
fname = info.fname if info else QAPISchemaModule.BUILTIN_MODULE_NAME
self._module = schema.module_by_fname(fname)
self._module.add_entity(self)
def set_module(self, schema):
self._set_module(schema, self.info)
@property
def ifcond(self):
assert self._checked
return self._ifcond
def is_implicit(self):
return not self.info
def visit(self, visitor):
assert self._checked
def describe(self):
assert self.meta
return "%s '%s'" % (self.meta, self.name)
class QAPISchemaVisitor:
def visit_begin(self, schema):
pass
def visit_end(self):
pass
def visit_module(self, name):
pass
def visit_needed(self, entity):
# Default to visiting everything
return True
def visit_include(self, name, info):
pass
def visit_builtin_type(self, name, info, json_type):
pass
def visit_enum_type(self, name, info, ifcond, features, members, prefix):
pass
def visit_array_type(self, name, info, ifcond, element_type):
pass
def visit_object_type(self, name, info, ifcond, features,
base, members, variants):
pass
def visit_object_type_flat(self, name, info, ifcond, features,
members, variants):
pass
def visit_alternate_type(self, name, info, ifcond, features, variants):
pass
def visit_command(self, name, info, ifcond, features,
arg_type, ret_type, gen, success_response, boxed,
allow_oob, allow_preconfig, coroutine):
pass
def visit_event(self, name, info, ifcond, features, arg_type, boxed):
pass
class QAPISchemaModule:
BUILTIN_MODULE_NAME = './builtin'
def __init__(self, name):
self.name = name
self._entity_list = []
@staticmethod
def is_system_module(name: str) -> bool:
"""
System modules are internally defined modules.
Their names start with the "./" prefix.
"""
return name.startswith('./')
@classmethod
def is_user_module(cls, name: str) -> bool:
"""
User modules are those defined by the user in qapi JSON files.
They do not start with the "./" prefix.
"""
return not cls.is_system_module(name)
@classmethod
def is_builtin_module(cls, name: str) -> bool:
"""
The built-in module is a single System module for the built-in types.
It is always "./builtin".
"""
return name == cls.BUILTIN_MODULE_NAME
def add_entity(self, ent):
self._entity_list.append(ent)
def visit(self, visitor):
visitor.visit_module(self.name)
for entity in self._entity_list:
if visitor.visit_needed(entity):
entity.visit(visitor)
class QAPISchemaInclude(QAPISchemaEntity):
def __init__(self, sub_module, info):
super().__init__(None, info, None)
self._sub_module = sub_module
def visit(self, visitor):
super().visit(visitor)
visitor.visit_include(self._sub_module.name, self.info)
class QAPISchemaType(QAPISchemaEntity):
# Return the C type for common use.
# For the types we commonly box, this is a pointer type.
def c_type(self):
pass
# Return the C type to be used in a parameter list.
def c_param_type(self):
return self.c_type()
# Return the C type to be used where we suppress boxing.
def c_unboxed_type(self):
return self.c_type()
def json_type(self):
pass
def alternate_qtype(self):
json2qtype = {
'null': 'QTYPE_QNULL',
'string': 'QTYPE_QSTRING',
'number': 'QTYPE_QNUM',
'int': 'QTYPE_QNUM',
'boolean': 'QTYPE_QBOOL',
'array': 'QTYPE_QLIST',
'object': 'QTYPE_QDICT'
}
return json2qtype.get(self.json_type())
def doc_type(self):
if self.is_implicit():
return None
return self.name
def need_has_if_optional(self):
# When FOO is a pointer, has_FOO == !!FOO, i.e. has_FOO is redundant.
# Except for arrays; see QAPISchemaArrayType.need_has_if_optional().
return not self.c_type().endswith(POINTER_SUFFIX)
def check(self, schema):
super().check(schema)
for feat in self.features:
if feat.is_special():
raise QAPISemError(
self.info,
f"feature '{feat.name}' is not supported for types")
def describe(self):
assert self.meta
return "%s type '%s'" % (self.meta, self.name)
class QAPISchemaBuiltinType(QAPISchemaType):
meta = 'built-in'
def __init__(self, name, json_type, c_type):
super().__init__(name, None, None)
assert not c_type or isinstance(c_type, str)
assert json_type in ('string', 'number', 'int', 'boolean', 'null',
'value')
self._json_type_name = json_type
self._c_type_name = c_type
def c_name(self):
return self.name
def c_type(self):
return self._c_type_name
def c_param_type(self):
if self.name == 'str':
return 'const ' + self._c_type_name
return self._c_type_name
def json_type(self):
return self._json_type_name
def doc_type(self):
return self.json_type()
def visit(self, visitor):
super().visit(visitor)
visitor.visit_builtin_type(self.name, self.info, self.json_type())
class QAPISchemaEnumType(QAPISchemaType):
meta = 'enum'
def __init__(self, name, info, doc, ifcond, features, members, prefix):
super().__init__(name, info, doc, ifcond, features)
for m in members:
assert isinstance(m, QAPISchemaEnumMember)
m.set_defined_in(name)
assert prefix is None or isinstance(prefix, str)
self.members = members
self.prefix = prefix
def check(self, schema):
super().check(schema)
seen = {}
for m in self.members:
m.check_clash(self.info, seen)
def connect_doc(self, doc=None):
super().connect_doc(doc)
doc = doc or self.doc
for m in self.members:
m.connect_doc(doc)
def is_implicit(self):
# See QAPISchema._def_predefineds()
return self.name == 'QType'
def c_type(self):
return c_name(self.name)
def member_names(self):
return [m.name for m in self.members]
def json_type(self):
return 'string'
def visit(self, visitor):
super().visit(visitor)
visitor.visit_enum_type(
self.name, self.info, self.ifcond, self.features,
self.members, self.prefix)
class QAPISchemaArrayType(QAPISchemaType):
meta = 'array'
def __init__(self, name, info, element_type):
super().__init__(name, info, None)
assert isinstance(element_type, str)
self._element_type_name = element_type
self.element_type = None
def need_has_if_optional(self):
# When FOO is an array, we still need has_FOO to distinguish
# absent (!has_FOO) from present and empty (has_FOO && !FOO).
return True
def check(self, schema):
super().check(schema)
self.element_type = schema.resolve_type(
self._element_type_name, self.info,
self.info and self.info.defn_meta)
assert not isinstance(self.element_type, QAPISchemaArrayType)
def set_module(self, schema):
self._set_module(schema, self.element_type.info)
@property
def ifcond(self):
assert self._checked
return self.element_type.ifcond
def is_implicit(self):
return True
def c_type(self):
return c_name(self.name) + POINTER_SUFFIX
def json_type(self):
return 'array'
def doc_type(self):
elt_doc_type = self.element_type.doc_type()
if not elt_doc_type:
return None
return 'array of ' + elt_doc_type
def visit(self, visitor):
super().visit(visitor)
visitor.visit_array_type(self.name, self.info, self.ifcond,
self.element_type)
def describe(self):
assert self.meta
return "%s type ['%s']" % (self.meta, self._element_type_name)
class QAPISchemaObjectType(QAPISchemaType):
def __init__(self, name, info, doc, ifcond, features,
base, local_members, variants):
# struct has local_members, optional base, and no variants
# union has base, variants, and no local_members
super().__init__(name, info, doc, ifcond, features)
self.meta = 'union' if variants else 'struct'
assert base is None or isinstance(base, str)
for m in local_members:
assert isinstance(m, QAPISchemaObjectTypeMember)
m.set_defined_in(name)
if variants is not None:
assert isinstance(variants, QAPISchemaVariants)
variants.set_defined_in(name)
self._base_name = base
self.base = None
self.local_members = local_members
self.variants = variants
self.members = None
def check(self, schema):
# This calls another type T's .check() exactly when the C
# struct emitted by gen_object() contains that T's C struct
# (pointers don't count).
if self.members is not None:
# A previous .check() completed: nothing to do
return
if self._checked:
# Recursed: C struct contains itself
raise QAPISemError(self.info,
"object %s contains itself" % self.name)
super().check(schema)
assert self._checked and self.members is None
seen = OrderedDict()
if self._base_name:
self.base = schema.resolve_type(self._base_name, self.info,
"'base'")
if (not isinstance(self.base, QAPISchemaObjectType)
or self.base.variants):
raise QAPISemError(
self.info,
"'base' requires a struct type, %s isn't"
% self.base.describe())
self.base.check(schema)
self.base.check_clash(self.info, seen)
for m in self.local_members:
m.check(schema)
m.check_clash(self.info, seen)
members = seen.values()
if self.variants:
self.variants.check(schema, seen)
self.variants.check_clash(self.info, seen)
self.members = members # mark completed
# Check that the members of this type do not cause duplicate JSON members,
# and update seen to track the members seen so far. Report any errors
# on behalf of info, which is not necessarily self.info
def check_clash(self, info, seen):
assert self._checked
for m in self.members:
m.check_clash(info, seen)
if self.variants:
self.variants.check_clash(info, seen)
def connect_doc(self, doc=None):
super().connect_doc(doc)
doc = doc or self.doc
if self.base and self.base.is_implicit():
self.base.connect_doc(doc)
for m in self.local_members:
m.connect_doc(doc)
def is_implicit(self):
# See QAPISchema._make_implicit_object_type(), as well as
# _def_predefineds()
return self.name.startswith('q_')
def is_empty(self):
assert self.members is not None
return not self.members and not self.variants
def has_conditional_members(self):
assert self.members is not None
return any(m.ifcond.is_present() for m in self.members)
def c_name(self):
assert self.name != 'q_empty'
return super().c_name()
def c_type(self):
assert not self.is_implicit()
return c_name(self.name) + POINTER_SUFFIX
def c_unboxed_type(self):
return c_name(self.name)
def json_type(self):
return 'object'
def visit(self, visitor):
super().visit(visitor)
visitor.visit_object_type(
self.name, self.info, self.ifcond, self.features,
self.base, self.local_members, self.variants)
visitor.visit_object_type_flat(
self.name, self.info, self.ifcond, self.features,
self.members, self.variants)
class QAPISchemaAlternateType(QAPISchemaType):
meta = 'alternate'
def __init__(self, name, info, doc, ifcond, features, variants):
super().__init__(name, info, doc, ifcond, features)
assert isinstance(variants, QAPISchemaVariants)
assert variants.tag_member
variants.set_defined_in(name)
variants.tag_member.set_defined_in(self.name)
self.variants = variants
def check(self, schema):
super().check(schema)
self.variants.tag_member.check(schema)
# Not calling self.variants.check_clash(), because there's nothing
# to clash with
self.variants.check(schema, {})
# Alternate branch names have no relation to the tag enum values;
# so we have to check for potential name collisions ourselves.
seen = {}
types_seen = {}
for v in self.variants.variants:
v.check_clash(self.info, seen)
qtype = v.type.alternate_qtype()
if not qtype:
raise QAPISemError(
self.info,
"%s cannot use %s"
% (v.describe(self.info), v.type.describe()))
conflicting = set([qtype])
if qtype == 'QTYPE_QSTRING':
if isinstance(v.type, QAPISchemaEnumType):
for m in v.type.members:
if m.name in ['on', 'off']:
conflicting.add('QTYPE_QBOOL')
if re.match(r'[-+0-9.]', m.name):
# lazy, could be tightened
conflicting.add('QTYPE_QNUM')
else:
conflicting.add('QTYPE_QNUM')
conflicting.add('QTYPE_QBOOL')
for qt in conflicting:
if qt in types_seen:
raise QAPISemError(
self.info,
"%s can't be distinguished from '%s'"
% (v.describe(self.info), types_seen[qt]))
types_seen[qt] = v.name
def connect_doc(self, doc=None):
super().connect_doc(doc)
doc = doc or self.doc
for v in self.variants.variants:
v.connect_doc(doc)
def c_type(self):
return c_name(self.name) + POINTER_SUFFIX
def json_type(self):
return 'value'
def visit(self, visitor):
super().visit(visitor)
visitor.visit_alternate_type(
self.name, self.info, self.ifcond, self.features, self.variants)
class QAPISchemaVariants:
def __init__(self, tag_name, info, tag_member, variants):
# Unions pass tag_name but not tag_member.
# Alternates pass tag_member but not tag_name.
# After check(), tag_member is always set.
assert bool(tag_member) != bool(tag_name)
assert (isinstance(tag_name, str) or
isinstance(tag_member, QAPISchemaObjectTypeMember))
for v in variants:
assert isinstance(v, QAPISchemaVariant)
self._tag_name = tag_name
self.info = info
self.tag_member = tag_member
self.variants = variants
def set_defined_in(self, name):
for v in self.variants:
v.set_defined_in(name)
def check(self, schema, seen):
if self._tag_name: # union
self.tag_member = seen.get(c_name(self._tag_name))
base = "'base'"
# Pointing to the base type when not implicit would be
# nice, but we don't know it here
if not self.tag_member or self._tag_name != self.tag_member.name:
raise QAPISemError(
self.info,
"discriminator '%s' is not a member of %s"
% (self._tag_name, base))
# Here we do:
base_type = schema.lookup_type(self.tag_member.defined_in)
assert base_type
if not base_type.is_implicit():
base = "base type '%s'" % self.tag_member.defined_in
if not isinstance(self.tag_member.type, QAPISchemaEnumType):
raise QAPISemError(
self.info,
"discriminator member '%s' of %s must be of enum type"
% (self._tag_name, base))
if self.tag_member.optional:
raise QAPISemError(
self.info,
"discriminator member '%s' of %s must not be optional"
% (self._tag_name, base))
if self.tag_member.ifcond.is_present():
raise QAPISemError(
self.info,
"discriminator member '%s' of %s must not be conditional"
% (self._tag_name, base))
else: # alternate
assert isinstance(self.tag_member.type, QAPISchemaEnumType)
assert not self.tag_member.optional
assert not self.tag_member.ifcond.is_present()
if self._tag_name: # union
# branches that are not explicitly covered get an empty type
cases = {v.name for v in self.variants}
for m in self.tag_member.type.members:
if m.name not in cases:
v = QAPISchemaVariant(m.name, self.info,
'q_empty', m.ifcond)
v.set_defined_in(self.tag_member.defined_in)
self.variants.append(v)
if not self.variants:
raise QAPISemError(self.info, "union has no branches")
for v in self.variants:
v.check(schema)
# Union names must match enum values; alternate names are
# checked separately. Use 'seen' to tell the two apart.
if seen:
if v.name not in self.tag_member.type.member_names():
raise QAPISemError(
self.info,
"branch '%s' is not a value of %s"
% (v.name, self.tag_member.type.describe()))
if not isinstance(v.type, QAPISchemaObjectType):
raise QAPISemError(
self.info,
"%s cannot use %s"
% (v.describe(self.info), v.type.describe()))
v.type.check(schema)
def check_clash(self, info, seen):
for v in self.variants:
# Reset seen map for each variant, since qapi names from one
# branch do not affect another branch
v.type.check_clash(info, dict(seen))
class QAPISchemaMember:
""" Represents object members, enum members and features """
role = 'member'
def __init__(self, name, info, ifcond=None):
assert isinstance(name, str)
self.name = name
self.info = info
self.ifcond = ifcond or QAPISchemaIfCond()
self.defined_in = None
def set_defined_in(self, name):
assert not self.defined_in
self.defined_in = name
def check_clash(self, info, seen):
cname = c_name(self.name)
if cname in seen:
raise QAPISemError(
info,
"%s collides with %s"
% (self.describe(info), seen[cname].describe(info)))
seen[cname] = self
def connect_doc(self, doc):
if doc:
doc.connect_member(self)
def describe(self, info):
role = self.role
meta = 'type'
defined_in = self.defined_in
assert defined_in
if defined_in.startswith('q_obj_'):
# See QAPISchema._make_implicit_object_type() - reverse the
# mapping there to create a nice human-readable description
defined_in = defined_in[6:]
if defined_in.endswith('-arg'):
# Implicit type created for a command's dict 'data'
assert role == 'member'
role = 'parameter'
meta = 'command'
defined_in = defined_in[:-4]
elif defined_in.endswith('-base'):
# Implicit type created for a union's dict 'base'
role = 'base ' + role
defined_in = defined_in[:-5]
else:
assert False
if defined_in != info.defn_name:
return "%s '%s' of %s '%s'" % (role, self.name, meta, defined_in)
return "%s '%s'" % (role, self.name)
class QAPISchemaEnumMember(QAPISchemaMember):
role = 'value'
def __init__(self, name, info, ifcond=None, features=None):
super().__init__(name, info, ifcond)
for f in features or []:
assert isinstance(f, QAPISchemaFeature)
f.set_defined_in(name)
self.features = features or []
def connect_doc(self, doc):
super().connect_doc(doc)
if doc:
for f in self.features:
doc.connect_feature(f)
class QAPISchemaFeature(QAPISchemaMember):
role = 'feature'
def is_special(self):
return self.name in ('deprecated', 'unstable')
class QAPISchemaObjectTypeMember(QAPISchemaMember):
def __init__(self, name, info, typ, optional, ifcond=None, features=None):
super().__init__(name, info, ifcond)
assert isinstance(typ, str)
assert isinstance(optional, bool)
for f in features or []:
assert isinstance(f, QAPISchemaFeature)
f.set_defined_in(name)
self._type_name = typ
self.type = None
self.optional = optional
self.features = features or []
def need_has(self):
assert self.type
return self.optional and self.type.need_has_if_optional()
def check(self, schema):
assert self.defined_in
self.type = schema.resolve_type(self._type_name, self.info,
self.describe)
seen = {}
for f in self.features:
f.check_clash(self.info, seen)
def connect_doc(self, doc):
super().connect_doc(doc)
if doc:
for f in self.features:
doc.connect_feature(f)
class QAPISchemaVariant(QAPISchemaObjectTypeMember):
role = 'branch'
def __init__(self, name, info, typ, ifcond=None):
super().__init__(name, info, typ, False, ifcond)
class QAPISchemaCommand(QAPISchemaEntity):
meta = 'command'
def __init__(self, name, info, doc, ifcond, features,
arg_type, ret_type,
gen, success_response, boxed, allow_oob, allow_preconfig,
coroutine):
super().__init__(name, info, doc, ifcond, features)
assert not arg_type or isinstance(arg_type, str)
assert not ret_type or isinstance(ret_type, str)
self._arg_type_name = arg_type
self.arg_type = None
self._ret_type_name = ret_type
self.ret_type = None
self.gen = gen
self.success_response = success_response
self.boxed = boxed
self.allow_oob = allow_oob
self.allow_preconfig = allow_preconfig
self.coroutine = coroutine
def check(self, schema):
super().check(schema)
if self._arg_type_name:
self.arg_type = schema.resolve_type(
self._arg_type_name, self.info, "command's 'data'")
if not isinstance(self.arg_type, QAPISchemaObjectType):
raise QAPISemError(
self.info,
"command's 'data' cannot take %s"
% self.arg_type.describe())
if self.arg_type.variants and not self.boxed:
raise QAPISemError(
self.info,
"command's 'data' can take %s only with 'boxed': true"
% self.arg_type.describe())
self.arg_type.check(schema)
if self.arg_type.has_conditional_members() and not self.boxed:
raise QAPISemError(
self.info,
"conditional command arguments require 'boxed': true")
if self._ret_type_name:
self.ret_type = schema.resolve_type(
self._ret_type_name, self.info, "command's 'returns'")
if self.name not in self.info.pragma.command_returns_exceptions:
typ = self.ret_type
if isinstance(typ, QAPISchemaArrayType):
typ = self.ret_type.element_type
assert typ
if not isinstance(typ, QAPISchemaObjectType):
raise QAPISemError(
self.info,
"command's 'returns' cannot take %s"
% self.ret_type.describe())
def connect_doc(self, doc=None):
super().connect_doc(doc)
doc = doc or self.doc
if doc:
if self.arg_type and self.arg_type.is_implicit():
self.arg_type.connect_doc(doc)
def visit(self, visitor):
super().visit(visitor)
visitor.visit_command(
self.name, self.info, self.ifcond, self.features,
self.arg_type, self.ret_type, self.gen, self.success_response,
self.boxed, self.allow_oob, self.allow_preconfig,
self.coroutine)
class QAPISchemaEvent(QAPISchemaEntity):
meta = 'event'
def __init__(self, name, info, doc, ifcond, features, arg_type, boxed):
super().__init__(name, info, doc, ifcond, features)
assert not arg_type or isinstance(arg_type, str)
self._arg_type_name = arg_type
self.arg_type = None
self.boxed = boxed
def check(self, schema):
super().check(schema)
if self._arg_type_name:
self.arg_type = schema.resolve_type(
self._arg_type_name, self.info, "event's 'data'")
if not isinstance(self.arg_type, QAPISchemaObjectType):
raise QAPISemError(
self.info,
"event's 'data' cannot take %s"
% self.arg_type.describe())
if self.arg_type.variants and not self.boxed:
raise QAPISemError(
self.info,
"event's 'data' can take %s only with 'boxed': true"
% self.arg_type.describe())
self.arg_type.check(schema)
if self.arg_type.has_conditional_members() and not self.boxed:
raise QAPISemError(
self.info,
"conditional event arguments require 'boxed': true")
def connect_doc(self, doc=None):
super().connect_doc(doc)
doc = doc or self.doc
if doc:
if self.arg_type and self.arg_type.is_implicit():
self.arg_type.connect_doc(doc)
def visit(self, visitor):
super().visit(visitor)
visitor.visit_event(
self.name, self.info, self.ifcond, self.features,
self.arg_type, self.boxed)
class QAPISchema:
def __init__(self, fname):
self.fname = fname
try:
parser = QAPISchemaParser(fname)
except OSError as err:
raise QAPIError(
f"can't read schema file '{fname}': {err.strerror}"
) from err
exprs = check_exprs(parser.exprs)
self.docs = parser.docs
self._entity_list = []
self._entity_dict = {}
self._module_dict = OrderedDict()
self._schema_dir = os.path.dirname(fname)
self._make_module(QAPISchemaModule.BUILTIN_MODULE_NAME)
self._make_module(fname)
self._predefining = True
self._def_predefineds()
self._predefining = False
self._def_exprs(exprs)
self.check()
def _def_entity(self, ent):
# Only the predefined types are allowed to not have info
assert ent.info or self._predefining
self._entity_list.append(ent)
if ent.name is None:
return
# TODO reject names that differ only in '_' vs. '.' vs. '-',
# because they're liable to clash in generated C.
other_ent = self._entity_dict.get(ent.name)
if other_ent:
if other_ent.info:
where = QAPISourceError(other_ent.info, "previous definition")
raise QAPISemError(
ent.info,
"'%s' is already defined\n%s" % (ent.name, where))
raise QAPISemError(
ent.info, "%s is already defined" % other_ent.describe())
self._entity_dict[ent.name] = ent
def lookup_entity(self, name, typ=None):
ent = self._entity_dict.get(name)
if typ and not isinstance(ent, typ):
return None
return ent
def lookup_type(self, name):
return self.lookup_entity(name, QAPISchemaType)
def resolve_type(self, name, info, what):
typ = self.lookup_type(name)
if not typ:
if callable(what):
what = what(info)
raise QAPISemError(
info, "%s uses unknown type '%s'" % (what, name))
return typ
def _module_name(self, fname: str) -> str:
if QAPISchemaModule.is_system_module(fname):
return fname
return os.path.relpath(fname, self._schema_dir)
def _make_module(self, fname):
name = self._module_name(fname)
if name not in self._module_dict:
self._module_dict[name] = QAPISchemaModule(name)
return self._module_dict[name]
def module_by_fname(self, fname):
name = self._module_name(fname)
return self._module_dict[name]
def _def_include(self, expr: QAPIExpression):
include = expr['include']
assert expr.doc is None
self._def_entity(
QAPISchemaInclude(self._make_module(include), expr.info))
def _def_builtin_type(self, name, json_type, c_type):
self._def_entity(QAPISchemaBuiltinType(name, json_type, c_type))
# Instantiating only the arrays that are actually used would
# be nice, but we can't as long as their generated code
# (qapi-builtin-types.[ch]) may be shared by some other
# schema.
self._make_array_type(name, None)
def _def_predefineds(self):
for t in [('str', 'string', 'char' + POINTER_SUFFIX),
('number', 'number', 'double'),
('int', 'int', 'int64_t'),
('int8', 'int', 'int8_t'),
('int16', 'int', 'int16_t'),
('int32', 'int', 'int32_t'),
('int64', 'int', 'int64_t'),
('uint8', 'int', 'uint8_t'),
('uint16', 'int', 'uint16_t'),
('uint32', 'int', 'uint32_t'),
('uint64', 'int', 'uint64_t'),
('size', 'int', 'uint64_t'),
('bool', 'boolean', 'bool'),
('any', 'value', 'QObject' + POINTER_SUFFIX),
('null', 'null', 'QNull' + POINTER_SUFFIX)]:
self._def_builtin_type(*t)
self.the_empty_object_type = QAPISchemaObjectType(
'q_empty', None, None, None, None, None, [], None)
self._def_entity(self.the_empty_object_type)
qtypes = ['none', 'qnull', 'qnum', 'qstring', 'qdict', 'qlist',
'qbool']
qtype_values = self._make_enum_members(
[{'name': n} for n in qtypes], None)
self._def_entity(QAPISchemaEnumType('QType', None, None, None, None,
qtype_values, 'QTYPE'))
def _make_features(self, features, info):
if features is None:
return []
return [QAPISchemaFeature(f['name'], info,
QAPISchemaIfCond(f.get('if')))
for f in features]
def _make_enum_member(self, name, ifcond, features, info):
return QAPISchemaEnumMember(name, info,
QAPISchemaIfCond(ifcond),
self._make_features(features, info))
def _make_enum_members(self, values, info):
return [self._make_enum_member(v['name'], v.get('if'),
v.get('features'), info)
for v in values]
def _make_array_type(self, element_type, info):
name = element_type + 'List' # reserved by check_defn_name_str()
if not self.lookup_type(name):
self._def_entity(QAPISchemaArrayType(name, info, element_type))
return name
def _make_implicit_object_type(self, name, info, ifcond, role, members):
if not members:
return None
# See also QAPISchemaObjectTypeMember.describe()
name = 'q_obj_%s-%s' % (name, role)
typ = self.lookup_entity(name, QAPISchemaObjectType)
if typ:
# The implicit object type has multiple users. This can
# only be a duplicate definition, which will be flagged
# later.
pass
else:
self._def_entity(QAPISchemaObjectType(
name, info, None, ifcond, None, None, members, None))
return name
def _def_enum_type(self, expr: QAPIExpression):
name = expr['enum']
data = expr['data']
prefix = expr.get('prefix')
ifcond = QAPISchemaIfCond(expr.get('if'))
info = expr.info
features = self._make_features(expr.get('features'), info)
self._def_entity(QAPISchemaEnumType(
name, info, expr.doc, ifcond, features,
self._make_enum_members(data, info), prefix))
def _make_member(self, name, typ, ifcond, features, info):
optional = False
if name.startswith('*'):
name = name[1:]
optional = True
if isinstance(typ, list):
assert len(typ) == 1
typ = self._make_array_type(typ[0], info)
return QAPISchemaObjectTypeMember(name, info, typ, optional, ifcond,
self._make_features(features, info))
def _make_members(self, data, info):
return [self._make_member(key, value['type'],
QAPISchemaIfCond(value.get('if')),
value.get('features'), info)
for (key, value) in data.items()]
def _def_struct_type(self, expr: QAPIExpression):
name = expr['struct']
base = expr.get('base')
data = expr['data']
info = expr.info
ifcond = QAPISchemaIfCond(expr.get('if'))
features = self._make_features(expr.get('features'), info)
self._def_entity(QAPISchemaObjectType(
name, info, expr.doc, ifcond, features, base,
self._make_members(data, info),
None))
def _make_variant(self, case, typ, ifcond, info):
if isinstance(typ, list):
assert len(typ) == 1
typ = self._make_array_type(typ[0], info)
return QAPISchemaVariant(case, info, typ, ifcond)
def _def_union_type(self, expr: QAPIExpression):
name = expr['union']
base = expr['base']
tag_name = expr['discriminator']
data = expr['data']
assert isinstance(data, dict)
info = expr.info
ifcond = QAPISchemaIfCond(expr.get('if'))
features = self._make_features(expr.get('features'), info)
if isinstance(base, dict):
base = self._make_implicit_object_type(
name, info, ifcond,
'base', self._make_members(base, info))
variants = [
self._make_variant(key, value['type'],
QAPISchemaIfCond(value.get('if')),
info)
for (key, value) in data.items()]
members: List[QAPISchemaObjectTypeMember] = []
self._def_entity(
QAPISchemaObjectType(name, info, expr.doc, ifcond, features,
base, members,
QAPISchemaVariants(
tag_name, info, None, variants)))
def _def_alternate_type(self, expr: QAPIExpression):
name = expr['alternate']
data = expr['data']
assert isinstance(data, dict)
ifcond = QAPISchemaIfCond(expr.get('if'))
info = expr.info
features = self._make_features(expr.get('features'), info)
variants = [
self._make_variant(key, value['type'],
QAPISchemaIfCond(value.get('if')),
info)
for (key, value) in data.items()]
tag_member = QAPISchemaObjectTypeMember('type', info, 'QType', False)
self._def_entity(
QAPISchemaAlternateType(
name, info, expr.doc, ifcond, features,
QAPISchemaVariants(None, info, tag_member, variants)))
def _def_command(self, expr: QAPIExpression):
name = expr['command']
data = expr.get('data')
rets = expr.get('returns')
gen = expr.get('gen', True)
success_response = expr.get('success-response', True)
boxed = expr.get('boxed', False)
allow_oob = expr.get('allow-oob', False)
allow_preconfig = expr.get('allow-preconfig', False)
coroutine = expr.get('coroutine', False)
ifcond = QAPISchemaIfCond(expr.get('if'))
info = expr.info
features = self._make_features(expr.get('features'), info)
if isinstance(data, OrderedDict):
data = self._make_implicit_object_type(
name, info, ifcond,
'arg', self._make_members(data, info))
if isinstance(rets, list):
assert len(rets) == 1
rets = self._make_array_type(rets[0], info)
self._def_entity(QAPISchemaCommand(name, info, expr.doc, ifcond,
features, data, rets,
gen, success_response,
boxed, allow_oob, allow_preconfig,
coroutine))
def _def_event(self, expr: QAPIExpression):
name = expr['event']
data = expr.get('data')
boxed = expr.get('boxed', False)
ifcond = QAPISchemaIfCond(expr.get('if'))
info = expr.info
features = self._make_features(expr.get('features'), info)
if isinstance(data, OrderedDict):
data = self._make_implicit_object_type(
name, info, ifcond,
'arg', self._make_members(data, info))
self._def_entity(QAPISchemaEvent(name, info, expr.doc, ifcond,
features, data, boxed))
def _def_exprs(self, exprs):
for expr in exprs:
if 'enum' in expr:
self._def_enum_type(expr)
elif 'struct' in expr:
self._def_struct_type(expr)
elif 'union' in expr:
self._def_union_type(expr)
elif 'alternate' in expr:
self._def_alternate_type(expr)
elif 'command' in expr:
self._def_command(expr)
elif 'event' in expr:
self._def_event(expr)
elif 'include' in expr:
self._def_include(expr)
else:
assert False
def check(self):
for ent in self._entity_list:
ent.check(self)
ent.connect_doc()
ent.check_doc()
for ent in self._entity_list:
ent.set_module(self)
def visit(self, visitor):
visitor.visit_begin(self)
for mod in self._module_dict.values():
mod.visit(visitor)
visitor.visit_end()
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