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 ret = '' 22 if not suppress_first_indent: 23 ret += indent(level) 24 if obj is None: 25 ret += 'QLIT_QNULL' 26 elif isinstance(obj, str): 27 ret += 'QLIT_QSTR(' + to_c_string(obj) + ')' 28 elif isinstance(obj, list): 29 elts = [to_qlit(elt, level + 1) 30 for elt in obj] 31 elts.append(indent(level + 1) + "{}") 32 ret += 'QLIT_QLIST(((QLitObject[]) {\n' 33 ret += ',\n'.join(elts) + '\n' 34 ret += indent(level) + '}))' 35 elif isinstance(obj, dict): 36 elts = [] 37 for key, value in sorted(obj.items()): 38 elts.append(indent(level + 1) + '{ %s, %s }' % 39 (to_c_string(key), to_qlit(value, level + 1, True))) 40 elts.append(indent(level + 1) + '{}') 41 ret += 'QLIT_QDICT(((QLitDictEntry[]) {\n' 42 ret += ',\n'.join(elts) + '\n' 43 ret += indent(level) + '}))' 44 elif isinstance(obj, bool): 45 ret += 'QLIT_QBOOL(%s)' % ('true' if obj else 'false') 46 else: 47 assert False # not implemented 48 return ret 49 50 51def to_c_string(string): 52 return '"' + string.replace('\\', r'\\').replace('"', r'\"') + '"' 53 54 55class QAPISchemaGenIntrospectVisitor(QAPISchemaMonolithicCVisitor): 56 57 def __init__(self, prefix, unmask): 58 QAPISchemaMonolithicCVisitor.__init__( 59 self, prefix, 'qapi-introspect', 60 ' * QAPI/QMP schema introspection', __doc__) 61 self._unmask = unmask 62 self._schema = None 63 self._qlits = [] 64 self._used_types = [] 65 self._name_map = {} 66 self._genc.add(mcgen(''' 67#include "qemu/osdep.h" 68#include "%(prefix)sqapi-introspect.h" 69 70''', 71 prefix=prefix)) 72 73 def visit_begin(self, schema): 74 self._schema = schema 75 76 def visit_end(self): 77 # visit the types that are actually used 78 qlits = self._qlits 79 self._qlits = [] 80 for typ in self._used_types: 81 typ.visit(self) 82 # generate C 83 # TODO can generate awfully long lines 84 qlits.extend(self._qlits) 85 name = c_name(self._prefix, protect=False) + 'qmp_schema_qlit' 86 self._genh.add(mcgen(''' 87#include "qapi/qmp/qlit.h" 88 89extern const QLitObject %(c_name)s; 90''', 91 c_name=c_name(name))) 92 self._genc.add(mcgen(''' 93const QLitObject %(c_name)s = %(c_string)s; 94''', 95 c_name=c_name(name), 96 c_string=to_qlit(qlits))) 97 self._schema = None 98 self._qlits = [] 99 self._used_types = [] 100 self._name_map = {} 101 102 def visit_needed(self, entity): 103 # Ignore types on first pass; visit_end() will pick up used types 104 return not isinstance(entity, QAPISchemaType) 105 106 def _name(self, name): 107 if self._unmask: 108 return name 109 if name not in self._name_map: 110 self._name_map[name] = '%d' % len(self._name_map) 111 return self._name_map[name] 112 113 def _use_type(self, typ): 114 # Map the various integer types to plain int 115 if typ.json_type() == 'int': 116 typ = self._schema.lookup_type('int') 117 elif (isinstance(typ, QAPISchemaArrayType) and 118 typ.element_type.json_type() == 'int'): 119 typ = self._schema.lookup_type('intList') 120 # Add type to work queue if new 121 if typ not in self._used_types: 122 self._used_types.append(typ) 123 # Clients should examine commands and events, not types. Hide 124 # type names to reduce the temptation. Also saves a few 125 # characters. 126 if isinstance(typ, QAPISchemaBuiltinType): 127 return typ.name 128 if isinstance(typ, QAPISchemaArrayType): 129 return '[' + self._use_type(typ.element_type) + ']' 130 return self._name(typ.name) 131 132 def _gen_qlit(self, name, mtype, obj): 133 if mtype not in ('command', 'event', 'builtin', 'array'): 134 name = self._name(name) 135 obj['name'] = name 136 obj['meta-type'] = mtype 137 self._qlits.append(obj) 138 139 def _gen_member(self, member): 140 ret = {'name': member.name, 'type': self._use_type(member.type)} 141 if member.optional: 142 ret['default'] = None 143 return ret 144 145 def _gen_variants(self, tag_name, variants): 146 return {'tag': tag_name, 147 'variants': [self._gen_variant(v) for v in variants]} 148 149 def _gen_variant(self, variant): 150 return {'case': variant.name, 'type': self._use_type(variant.type)} 151 152 def visit_builtin_type(self, name, info, json_type): 153 self._gen_qlit(name, 'builtin', {'json-type': json_type}) 154 155 def visit_enum_type(self, name, info, values, prefix): 156 self._gen_qlit(name, 'enum', {'values': values}) 157 158 def visit_array_type(self, name, info, element_type): 159 element = self._use_type(element_type) 160 self._gen_qlit('[' + element + ']', 'array', {'element-type': element}) 161 162 def visit_object_type_flat(self, name, info, members, variants): 163 obj = {'members': [self._gen_member(m) for m in members]} 164 if variants: 165 obj.update(self._gen_variants(variants.tag_member.name, 166 variants.variants)) 167 self._gen_qlit(name, 'object', obj) 168 169 def visit_alternate_type(self, name, info, variants): 170 self._gen_qlit(name, 'alternate', 171 {'members': [{'type': self._use_type(m.type)} 172 for m in variants.variants]}) 173 174 def visit_command(self, name, info, arg_type, ret_type, 175 gen, success_response, boxed, allow_oob): 176 arg_type = arg_type or self._schema.the_empty_object_type 177 ret_type = ret_type or self._schema.the_empty_object_type 178 self._gen_qlit(name, 'command', 179 {'arg-type': self._use_type(arg_type), 180 'ret-type': self._use_type(ret_type), 181 'allow-oob': allow_oob}) 182 183 def visit_event(self, name, info, arg_type, boxed): 184 arg_type = arg_type or self._schema.the_empty_object_type 185 self._gen_qlit(name, 'event', {'arg-type': self._use_type(arg_type)}) 186 187 188def gen_introspect(schema, output_dir, prefix, opt_unmask): 189 vis = QAPISchemaGenIntrospectVisitor(prefix, opt_unmask) 190 schema.visit(vis) 191 vis.write(output_dir) 192