1""" 2QAPI introspection generator 3 4Copyright (C) 2015-2018 Red Hat, Inc. 5 6Authors: 7 Markus Armbruster <armbru@redhat.com> 8 9This work is licensed under the terms of the GNU GPL, version 2. 10See the COPYING file in the top-level directory. 11""" 12 13from qapi.common import * 14 15 16def to_qlit(obj, level=0, suppress_first_indent=False): 17 18 def indent(level): 19 return level * 4 * ' ' 20 21 if isinstance(obj, tuple): 22 ifobj, extra = obj 23 ifcond = extra.get('if') 24 comment = extra.get('comment') 25 ret = '' 26 if comment: 27 ret += indent(level) + '/* %s */\n' % comment 28 if ifcond: 29 ret += gen_if(ifcond) 30 ret += to_qlit(ifobj, level) 31 if ifcond: 32 ret += '\n' + gen_endif(ifcond) 33 return ret 34 35 ret = '' 36 if not suppress_first_indent: 37 ret += indent(level) 38 if obj is None: 39 ret += 'QLIT_QNULL' 40 elif isinstance(obj, str): 41 ret += 'QLIT_QSTR(' + to_c_string(obj) + ')' 42 elif isinstance(obj, list): 43 elts = [to_qlit(elt, level + 1).strip('\n') 44 for elt in obj] 45 elts.append(indent(level + 1) + "{}") 46 ret += 'QLIT_QLIST(((QLitObject[]) {\n' 47 ret += '\n'.join(elts) + '\n' 48 ret += indent(level) + '}))' 49 elif isinstance(obj, dict): 50 elts = [] 51 for key, value in sorted(obj.items()): 52 elts.append(indent(level + 1) + '{ %s, %s }' % 53 (to_c_string(key), to_qlit(value, level + 1, True))) 54 elts.append(indent(level + 1) + '{}') 55 ret += 'QLIT_QDICT(((QLitDictEntry[]) {\n' 56 ret += ',\n'.join(elts) + '\n' 57 ret += indent(level) + '}))' 58 elif isinstance(obj, bool): 59 ret += 'QLIT_QBOOL(%s)' % ('true' if obj else 'false') 60 else: 61 assert False # not implemented 62 if level > 0: 63 ret += ',' 64 return ret 65 66 67def to_c_string(string): 68 return '"' + string.replace('\\', r'\\').replace('"', r'\"') + '"' 69 70 71class QAPISchemaGenIntrospectVisitor(QAPISchemaMonolithicCVisitor): 72 73 def __init__(self, prefix, unmask): 74 QAPISchemaMonolithicCVisitor.__init__( 75 self, prefix, 'qapi-introspect', 76 ' * QAPI/QMP schema introspection', __doc__) 77 self._unmask = unmask 78 self._schema = None 79 self._qlits = [] 80 self._used_types = [] 81 self._name_map = {} 82 self._genc.add(mcgen(''' 83#include "qemu/osdep.h" 84#include "%(prefix)sqapi-introspect.h" 85 86''', 87 prefix=prefix)) 88 89 def visit_begin(self, schema): 90 self._schema = schema 91 92 def visit_end(self): 93 # visit the types that are actually used 94 for typ in self._used_types: 95 typ.visit(self) 96 # generate C 97 name = c_name(self._prefix, protect=False) + 'qmp_schema_qlit' 98 self._genh.add(mcgen(''' 99#include "qapi/qmp/qlit.h" 100 101extern const QLitObject %(c_name)s; 102''', 103 c_name=c_name(name))) 104 self._genc.add(mcgen(''' 105const QLitObject %(c_name)s = %(c_string)s; 106''', 107 c_name=c_name(name), 108 c_string=to_qlit(self._qlits))) 109 self._schema = None 110 self._qlits = [] 111 self._used_types = [] 112 self._name_map = {} 113 114 def visit_needed(self, entity): 115 # Ignore types on first pass; visit_end() will pick up used types 116 return not isinstance(entity, QAPISchemaType) 117 118 def _name(self, name): 119 if self._unmask: 120 return name 121 if name not in self._name_map: 122 self._name_map[name] = '%d' % len(self._name_map) 123 return self._name_map[name] 124 125 def _use_type(self, typ): 126 # Map the various integer types to plain int 127 if typ.json_type() == 'int': 128 typ = self._schema.lookup_type('int') 129 elif (isinstance(typ, QAPISchemaArrayType) and 130 typ.element_type.json_type() == 'int'): 131 typ = self._schema.lookup_type('intList') 132 # Add type to work queue if new 133 if typ not in self._used_types: 134 self._used_types.append(typ) 135 # Clients should examine commands and events, not types. Hide 136 # type names as integers to reduce the temptation. Also, it 137 # saves a few characters on the wire. 138 if isinstance(typ, QAPISchemaBuiltinType): 139 return typ.name 140 if isinstance(typ, QAPISchemaArrayType): 141 return '[' + self._use_type(typ.element_type) + ']' 142 return self._name(typ.name) 143 144 def _gen_qlit(self, name, mtype, obj, ifcond): 145 extra = {} 146 if mtype not in ('command', 'event', 'builtin', 'array'): 147 if not self._unmask: 148 # Output a comment to make it easy to map masked names 149 # back to the source when reading the generated output. 150 extra['comment'] = '"%s" = %s' % (self._name(name), name) 151 name = self._name(name) 152 obj['name'] = name 153 obj['meta-type'] = mtype 154 if ifcond: 155 extra['if'] = ifcond 156 if extra: 157 self._qlits.append((obj, extra)) 158 else: 159 self._qlits.append(obj) 160 161 def _gen_member(self, member): 162 ret = {'name': member.name, 'type': self._use_type(member.type)} 163 if member.optional: 164 ret['default'] = None 165 return ret 166 167 def _gen_variants(self, tag_name, variants): 168 return {'tag': tag_name, 169 'variants': [self._gen_variant(v) for v in variants]} 170 171 def _gen_variant(self, variant): 172 return {'case': variant.name, 'type': self._use_type(variant.type)} 173 174 def visit_builtin_type(self, name, info, json_type): 175 self._gen_qlit(name, 'builtin', {'json-type': json_type}, []) 176 177 def visit_enum_type(self, name, info, ifcond, values, prefix): 178 self._gen_qlit(name, 'enum', {'values': values}, ifcond) 179 180 def visit_array_type(self, name, info, ifcond, element_type): 181 element = self._use_type(element_type) 182 self._gen_qlit('[' + element + ']', 'array', {'element-type': element}, 183 ifcond) 184 185 def visit_object_type_flat(self, name, info, ifcond, members, variants): 186 obj = {'members': [self._gen_member(m) for m in members]} 187 if variants: 188 obj.update(self._gen_variants(variants.tag_member.name, 189 variants.variants)) 190 self._gen_qlit(name, 'object', obj, ifcond) 191 192 def visit_alternate_type(self, name, info, ifcond, variants): 193 self._gen_qlit(name, 'alternate', 194 {'members': [{'type': self._use_type(m.type)} 195 for m in variants.variants]}, ifcond) 196 197 def visit_command(self, name, info, ifcond, arg_type, ret_type, gen, 198 success_response, boxed, allow_oob, allow_preconfig): 199 arg_type = arg_type or self._schema.the_empty_object_type 200 ret_type = ret_type or self._schema.the_empty_object_type 201 obj = {'arg-type': self._use_type(arg_type), 202 'ret-type': self._use_type(ret_type)} 203 if allow_oob: 204 obj['allow-oob'] = allow_oob 205 self._gen_qlit(name, 'command', obj, ifcond) 206 207 def visit_event(self, name, info, ifcond, arg_type, boxed): 208 arg_type = arg_type or self._schema.the_empty_object_type 209 self._gen_qlit(name, 'event', {'arg-type': self._use_type(arg_type)}, 210 ifcond) 211 212 213def gen_introspect(schema, output_dir, prefix, opt_unmask): 214 vis = QAPISchemaGenIntrospectVisitor(prefix, opt_unmask) 215 schema.visit(vis) 216 vis.write(output_dir) 217