mirror of https://gitee.com/openkylin/qemu.git
246 lines
8.4 KiB
Python
246 lines
8.4 KiB
Python
"""
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QAPI introspection generator
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Copyright (C) 2015-2018 Red Hat, Inc.
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Authors:
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Markus Armbruster <armbru@redhat.com>
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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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"""
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from .common import (
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c_name,
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gen_endif,
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gen_if,
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mcgen,
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)
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from .gen import QAPISchemaMonolithicCVisitor
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from .schema import (
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QAPISchemaArrayType,
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QAPISchemaBuiltinType,
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QAPISchemaType,
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)
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def _make_tree(obj, ifcond, features, extra=None):
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if extra is None:
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extra = {}
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if ifcond:
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extra['if'] = ifcond
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if features:
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obj['features'] = [(f.name, {'if': f.ifcond}) for f in features]
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if extra:
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return (obj, extra)
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return obj
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def _tree_to_qlit(obj, level=0, suppress_first_indent=False):
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def indent(level):
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return level * 4 * ' '
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if isinstance(obj, tuple):
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ifobj, extra = obj
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ifcond = extra.get('if')
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comment = extra.get('comment')
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ret = ''
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if comment:
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ret += indent(level) + '/* %s */\n' % comment
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if ifcond:
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ret += gen_if(ifcond)
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ret += _tree_to_qlit(ifobj, level)
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if ifcond:
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ret += '\n' + gen_endif(ifcond)
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return ret
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ret = ''
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if not suppress_first_indent:
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ret += indent(level)
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if obj is None:
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ret += 'QLIT_QNULL'
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elif isinstance(obj, str):
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ret += 'QLIT_QSTR(' + to_c_string(obj) + ')'
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elif isinstance(obj, list):
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elts = [_tree_to_qlit(elt, level + 1).strip('\n')
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for elt in obj]
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elts.append(indent(level + 1) + "{}")
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ret += 'QLIT_QLIST(((QLitObject[]) {\n'
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ret += '\n'.join(elts) + '\n'
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ret += indent(level) + '}))'
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elif isinstance(obj, dict):
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elts = []
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for key, value in sorted(obj.items()):
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elts.append(indent(level + 1) + '{ %s, %s }' %
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(to_c_string(key),
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_tree_to_qlit(value, level + 1, True)))
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elts.append(indent(level + 1) + '{}')
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ret += 'QLIT_QDICT(((QLitDictEntry[]) {\n'
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ret += ',\n'.join(elts) + '\n'
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ret += indent(level) + '}))'
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elif isinstance(obj, bool):
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ret += 'QLIT_QBOOL(%s)' % ('true' if obj else 'false')
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else:
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assert False # not implemented
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if level > 0:
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ret += ','
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return ret
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def to_c_string(string):
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return '"' + string.replace('\\', r'\\').replace('"', r'\"') + '"'
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class QAPISchemaGenIntrospectVisitor(QAPISchemaMonolithicCVisitor):
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def __init__(self, prefix, unmask):
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super().__init__(
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prefix, 'qapi-introspect',
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' * QAPI/QMP schema introspection', __doc__)
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self._unmask = unmask
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self._schema = None
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self._trees = []
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self._used_types = []
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self._name_map = {}
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self._genc.add(mcgen('''
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#include "qemu/osdep.h"
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#include "%(prefix)sqapi-introspect.h"
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''',
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prefix=prefix))
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def visit_begin(self, schema):
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self._schema = schema
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def visit_end(self):
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# visit the types that are actually used
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for typ in self._used_types:
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typ.visit(self)
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# generate C
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name = c_name(self._prefix, protect=False) + 'qmp_schema_qlit'
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self._genh.add(mcgen('''
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#include "qapi/qmp/qlit.h"
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extern const QLitObject %(c_name)s;
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''',
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c_name=c_name(name)))
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self._genc.add(mcgen('''
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const QLitObject %(c_name)s = %(c_string)s;
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''',
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c_name=c_name(name),
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c_string=_tree_to_qlit(self._trees)))
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self._schema = None
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self._trees = []
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self._used_types = []
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self._name_map = {}
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def visit_needed(self, entity):
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# Ignore types on first pass; visit_end() will pick up used types
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return not isinstance(entity, QAPISchemaType)
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def _name(self, name):
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if self._unmask:
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return name
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if name not in self._name_map:
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self._name_map[name] = '%d' % len(self._name_map)
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return self._name_map[name]
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def _use_type(self, typ):
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# Map the various integer types to plain int
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if typ.json_type() == 'int':
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typ = self._schema.lookup_type('int')
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elif (isinstance(typ, QAPISchemaArrayType) and
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typ.element_type.json_type() == 'int'):
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typ = self._schema.lookup_type('intList')
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# Add type to work queue if new
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if typ not in self._used_types:
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self._used_types.append(typ)
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# Clients should examine commands and events, not types. Hide
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# type names as integers to reduce the temptation. Also, it
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# saves a few characters on the wire.
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if isinstance(typ, QAPISchemaBuiltinType):
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return typ.name
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if isinstance(typ, QAPISchemaArrayType):
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return '[' + self._use_type(typ.element_type) + ']'
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return self._name(typ.name)
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def _gen_tree(self, name, mtype, obj, ifcond, features):
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extra = None
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if mtype not in ('command', 'event', 'builtin', 'array'):
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if not self._unmask:
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# Output a comment to make it easy to map masked names
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# back to the source when reading the generated output.
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extra = {'comment': '"%s" = %s' % (self._name(name), name)}
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name = self._name(name)
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obj['name'] = name
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obj['meta-type'] = mtype
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self._trees.append(_make_tree(obj, ifcond, features, extra))
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def _gen_member(self, member):
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obj = {'name': member.name, 'type': self._use_type(member.type)}
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if member.optional:
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obj['default'] = None
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return _make_tree(obj, member.ifcond, member.features)
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def _gen_variants(self, tag_name, variants):
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return {'tag': tag_name,
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'variants': [self._gen_variant(v) for v in variants]}
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def _gen_variant(self, variant):
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obj = {'case': variant.name, 'type': self._use_type(variant.type)}
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return _make_tree(obj, variant.ifcond, None)
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def visit_builtin_type(self, name, info, json_type):
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self._gen_tree(name, 'builtin', {'json-type': json_type}, [], None)
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def visit_enum_type(self, name, info, ifcond, features, members, prefix):
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self._gen_tree(name, 'enum',
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{'values': [_make_tree(m.name, m.ifcond, None)
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for m in members]},
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ifcond, features)
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def visit_array_type(self, name, info, ifcond, element_type):
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element = self._use_type(element_type)
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self._gen_tree('[' + element + ']', 'array', {'element-type': element},
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ifcond, None)
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def visit_object_type_flat(self, name, info, ifcond, features,
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members, variants):
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obj = {'members': [self._gen_member(m) for m in members]}
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if variants:
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obj.update(self._gen_variants(variants.tag_member.name,
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variants.variants))
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self._gen_tree(name, 'object', obj, ifcond, features)
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def visit_alternate_type(self, name, info, ifcond, features, variants):
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self._gen_tree(name, 'alternate',
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{'members': [
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_make_tree({'type': self._use_type(m.type)},
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m.ifcond, None)
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for m in variants.variants]},
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ifcond, features)
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def visit_command(self, name, info, ifcond, features,
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arg_type, ret_type, gen, success_response, boxed,
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allow_oob, allow_preconfig, coroutine):
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arg_type = arg_type or self._schema.the_empty_object_type
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ret_type = ret_type or self._schema.the_empty_object_type
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obj = {'arg-type': self._use_type(arg_type),
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'ret-type': self._use_type(ret_type)}
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if allow_oob:
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obj['allow-oob'] = allow_oob
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self._gen_tree(name, 'command', obj, ifcond, features)
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def visit_event(self, name, info, ifcond, features, arg_type, boxed):
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arg_type = arg_type or self._schema.the_empty_object_type
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self._gen_tree(name, 'event', {'arg-type': self._use_type(arg_type)},
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ifcond, features)
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def gen_introspect(schema, output_dir, prefix, opt_unmask):
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vis = QAPISchemaGenIntrospectVisitor(prefix, opt_unmask)
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schema.visit(vis)
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vis.write(output_dir)
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