scripts/qapi-visit.py

   1 #
   2 # QAPI visitor generator
   3 #
   4 # Copyright IBM, Corp. 2011
   5 #
   6 # Authors:
   7 #  Anthony Liguori <aliguori@us.ibm.com>
   8 #  Michael Roth    <mdroth@linux.vnet.ibm.com>
   9 #
  10 # This work is licensed under the terms of the GNU GPLv2.
  11 # See the COPYING.LIB file in the top-level directory.
  12
  13 from ordereddict import OrderedDict
  14 from qapi import *
  15 import sys
  16 import os
  17 import getopt
  18 import errno
  19
  20 def generate_visit_struct_body(field_prefix, members):
  21     ret = ""
  22     if len(field_prefix):
  23         field_prefix = field_prefix + "."
  24     for argname, argentry, optional, structured in parse_args(members):
  25         if optional:
  26             ret += mcgen('''
  27 visit_start_optional(m, (obj && *obj) ? &(*obj)->%(c_prefix)shas_%(c_name)s : NULL, "%(name)s", errp);
  28 if ((*obj)->%(prefix)shas_%(c_name)s) {
  29 ''',
  30                          c_prefix=c_var(field_prefix), prefix=field_prefix,
  31                          c_name=c_var(argname), name=argname)
  32             push_indent()
  33
  34         if structured:
  35             ret += mcgen('''
  36 visit_start_struct(m, NULL, "", "%(name)s", 0, errp);
  37 ''',
  38                          name=argname)
  39             ret += generate_visit_struct_body(field_prefix + argname, argentry)
  40             ret += mcgen('''
  41 visit_end_struct(m, errp);
  42 ''')
  43         else:
  44             ret += mcgen('''
  45 visit_type_%(type)s(m, (obj && *obj) ? &(*obj)->%(c_prefix)s%(c_name)s : NULL, "%(name)s", errp);
  46 ''',
  47                          c_prefix=c_var(field_prefix), prefix=field_prefix,
  48                          type=type_name(argentry), c_name=c_var(argname),
  49                          name=argname)
  50
  51         if optional:
  52             pop_indent()
  53             ret += mcgen('''
  54 }
  55 visit_end_optional(m, errp);
  56 ''')
  57     return ret
  58
  59 def generate_visit_struct(name, members):
  60     ret = mcgen('''
  61
  62 void visit_type_%(name)s(Visitor *m, %(name)s ** obj, const char *name, Error **errp)
  63 {
  64     visit_start_struct(m, (void **)obj, "%(name)s", name, sizeof(%(name)s), errp);
  65 ''',
  66                 name=name)
  67     push_indent()
  68     ret += generate_visit_struct_body("", members)
  69     pop_indent()
  70
  71     ret += mcgen('''
  72     visit_end_struct(m, errp);
  73 }
  74 ''')
  75     return ret
  76
  77 def generate_visit_list(name, members):
  78     return mcgen('''
  79
  80 void visit_type_%(name)sList(Visitor *m, %(name)sList ** obj, const char *name, Error **errp)
  81 {
  82     GenericList *i, **head = (GenericList **)obj;
  83
  84     visit_start_list(m, name, errp);
  85
  86     for (*head = i = visit_next_list(m, head, errp); i; i = visit_next_list(m, &i, errp)) {
  87         %(name)sList *native_i = (%(name)sList *)i;
  88         visit_type_%(name)s(m, &native_i->value, NULL, errp);
  89     }
  90
  91     visit_end_list(m, errp);
  92 }
  93 ''',
  94                 name=name)
  95
  96 def generate_visit_enum(name, members):
  97     return mcgen('''
  98
  99 void visit_type_%(name)s(Visitor *m, %(name)s * obj, const char *name, Error **errp)
 100 {
 101     visit_type_enum(m, (int *)obj, %(name)s_lookup, "%(name)s", name, errp);
 102 }
 103 ''',
 104                  name=name)
 105
 106 def generate_visit_union(name, members):
 107     ret = generate_visit_enum('%sKind' % name, members.keys())
 108
 109     ret += mcgen('''
 110
 111 void visit_type_%(name)s(Visitor *m, %(name)s ** obj, const char *name, Error **errp)
 112 {
 113 }
 114 ''',
 115                  name=name)
 116
 117     return ret
 118
 119 def generate_declaration(name, members, genlist=True):
 120     ret = mcgen('''
 121
 122 void visit_type_%(name)s(Visitor *m, %(name)s ** obj, const char *name, Error **errp);
 123 ''',
 124                 name=name)
 125
 126     if genlist:
 127         ret += mcgen('''
 128 void visit_type_%(name)sList(Visitor *m, %(name)sList ** obj, const char *name, Error **errp);
 129 ''',
 130                  name=name)
 131
 132     return ret
 133
 134 def generate_decl_enum(name, members, genlist=True):
 135     return mcgen('''
 136
 137 void visit_type_%(name)s(Visitor *m, %(name)s * obj, const char *name, Error **errp);
 138 ''',
 139                 name=name)
 140
 141 try:
 142     opts, args = getopt.gnu_getopt(sys.argv[1:], "chp:o:",
 143                                    ["source", "header", "prefix=", "output-dir="])
 144 except getopt.GetoptError, err:
 145     print str(err)
 146     sys.exit(1)
 147
 148 output_dir = ""
 149 prefix = ""
 150 c_file = 'qapi-visit.c'
 151 h_file = 'qapi-visit.h'
 152
 153 do_c = False
 154 do_h = False
 155
 156 for o, a in opts:
 157     if o in ("-p", "--prefix"):
 158         prefix = a
 159     elif o in ("-o", "--output-dir"):
 160         output_dir = a + "/"
 161     elif o in ("-c", "--source"):
 162         do_c = True
 163     elif o in ("-h", "--header"):
 164         do_h = True
 165
 166 if not do_c and not do_h:
 167     do_c = True
 168     do_h = True
 169
 170 c_file = output_dir + prefix + c_file
 171 h_file = output_dir + prefix + h_file
 172
 173 try:
 174     os.makedirs(output_dir)
 175 except os.error, e:
 176     if e.errno != errno.EEXIST:
 177         raise
 178
 179 def maybe_open(really, name, opt):
 180     if really:
 181         return open(name, opt)
 182     else:
 183         import StringIO
 184         return StringIO.StringIO()
 185
 186 fdef = maybe_open(do_c, c_file, 'w')
 187 fdecl = maybe_open(do_h, h_file, 'w')
 188
 189 fdef.write(mcgen('''
 190 /* THIS FILE IS AUTOMATICALLY GENERATED, DO NOT MODIFY */
 191
 192 /*
 193  * schema-defined QAPI visitor functions
 194  *
 195  * Copyright IBM, Corp. 2011
 196  *
 197  * Authors:
 198  *  Anthony Liguori   <aliguori@us.ibm.com>
 199  *
 200  * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
 201  * See the COPYING.LIB file in the top-level directory.
 202  *
 203  */
 204
 205 #include "%(header)s"
 206 ''',
 207                  header=basename(h_file)))
 208
 209 fdecl.write(mcgen('''
 210 /* THIS FILE IS AUTOMATICALLY GENERATED, DO NOT MODIFY */
 211
 212 /*
 213  * schema-defined QAPI visitor function
 214  *
 215  * Copyright IBM, Corp. 2011
 216  *
 217  * Authors:
 218  *  Anthony Liguori   <aliguori@us.ibm.com>
 219  *
 220  * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
 221  * See the COPYING.LIB file in the top-level directory.
 222  *
 223  */
 224
 225 #ifndef %(guard)s
 226 #define %(guard)s
 227
 228 #include "qapi/qapi-visit-core.h"
 229 #include "%(prefix)sqapi-types.h"
 230 ''',
 231                   prefix=prefix, guard=guardname(h_file)))
 232
 233 exprs = parse_schema(sys.stdin)
 234
 235 for expr in exprs:
 236     if expr.has_key('type'):
 237         ret = generate_visit_struct(expr['type'], expr['data'])
 238         ret += generate_visit_list(expr['type'], expr['data'])
 239         fdef.write(ret)
 240
 241         ret = generate_declaration(expr['type'], expr['data'])
 242         fdecl.write(ret)
 243     elif expr.has_key('union'):
 244         ret = generate_visit_union(expr['union'], expr['data'])
 245         fdef.write(ret)
 246
 247         ret = generate_decl_enum('%sKind' % expr['union'], expr['data'].keys())
 248         ret += generate_declaration(expr['union'], expr['data'])
 249         fdecl.write(ret)
 250     elif expr.has_key('enum'):
 251         ret = generate_visit_enum(expr['enum'], expr['data'])
 252         fdef.write(ret)
 253
 254         ret = generate_decl_enum(expr['enum'], expr['data'])
 255         fdecl.write(ret)
 256
 257 fdecl.write('''
 258 #endif
 259 ''')
 260
 261 fdecl.flush()
 262 fdecl.close()
 263
 264 fdef.flush()
 265 fdef.close()