scripts/qapi-visit.py

   1 #
   2 # QAPI visitor generator
   3 #
   4 # Copyright IBM, Corp. 2011
   5 # Copyright (C) 2014 Red Hat, Inc.
   6 #
   7 # Authors:
   8 #  Anthony Liguori <aliguori@us.ibm.com>
   9 #  Michael Roth    <mdroth@linux.vnet.ibm.com>
  10 #  Markus Armbruster <armbru@redhat.com>
  11 #
  12 # This work is licensed under the terms of the GNU GPL, version 2.
  13 # See the COPYING file in the top-level directory.
  14
  15 from ordereddict import OrderedDict
  16 from qapi import *
  17 import re
  18 import sys
  19 import os
  20 import getopt
  21 import errno
  22
  23 implicit_structs = []
  24
  25 def generate_visit_implicit_struct(type):
  26     global implicit_structs
  27     if type in implicit_structs:
  28         return ''
  29     implicit_structs.append(type)
  30     return mcgen('''
  31
  32 static void visit_type_implicit_%(c_type)s(Visitor *m, %(c_type)s **obj, Error **errp)
  33 {
  34     Error *err = NULL;
  35
  36     visit_start_implicit_struct(m, (void **)obj, sizeof(%(c_type)s), &err);
  37     if (!err) {
  38         visit_type_%(c_type)s_fields(m, obj, errp);
  39         visit_end_implicit_struct(m, &err);
  40     }
  41     error_propagate(errp, err);
  42 }
  43 ''',
  44                  c_type=type_name(type))
  45
  46 def generate_visit_struct_fields(name, field_prefix, fn_prefix, members, base = None):
  47     substructs = []
  48     ret = ''
  49     if not fn_prefix:
  50         full_name = name
  51     else:
  52         full_name = "%s_%s" % (name, fn_prefix)
  53
  54     for argname, argentry, optional, structured in parse_args(members):
  55         if structured:
  56             if not fn_prefix:
  57                 nested_fn_prefix = argname
  58             else:
  59                 nested_fn_prefix = "%s_%s" % (fn_prefix, argname)
  60
  61             nested_field_prefix = "%s%s." % (field_prefix, argname)
  62             ret += generate_visit_struct_fields(name, nested_field_prefix,
  63                                                 nested_fn_prefix, argentry)
  64             ret += mcgen('''
  65
  66 static void visit_type_%(full_name)s_field_%(c_name)s(Visitor *m, %(name)s **obj, Error **errp)
  67 {
  68 ''',
  69                          name=name, full_name=full_name, c_name=c_var(argname))
  70             ret += generate_visit_struct_body(full_name, argname, argentry)
  71             ret += mcgen('''
  72 }
  73 ''')
  74
  75     if base:
  76         ret += generate_visit_implicit_struct(base)
  77
  78     ret += mcgen('''
  79
  80 static void visit_type_%(full_name)s_fields(Visitor *m, %(name)s ** obj, Error **errp)
  81 {
  82     Error *err = NULL;
  83 ''',
  84         name=name, full_name=full_name)
  85     push_indent()
  86
  87     if base:
  88         ret += mcgen('''
  89 visit_type_implicit_%(type)s(m, &(*obj)->%(c_prefix)s%(c_name)s, &err);
  90 if (err) {
  91     goto out;
  92 }
  93 ''',
  94                      c_prefix=c_var(field_prefix),
  95                      type=type_name(base), c_name=c_var('base'))
  96
  97     for argname, argentry, optional, structured in parse_args(members):
  98         if optional:
  99             ret += mcgen('''
 100 visit_optional(m, &(*obj)->%(c_prefix)shas_%(c_name)s, "%(name)s", &err);
 101 if (!err && (*obj)->%(prefix)shas_%(c_name)s) {
 102 ''',
 103                          c_prefix=c_var(field_prefix), prefix=field_prefix,
 104                          c_name=c_var(argname), name=argname)
 105             push_indent()
 106
 107         if structured:
 108             ret += mcgen('''
 109 visit_type_%(full_name)s_field_%(c_name)s(m, obj, &err);
 110 ''',
 111                          full_name=full_name, c_name=c_var(argname))
 112         else:
 113             ret += mcgen('''
 114 visit_type_%(type)s(m, &(*obj)->%(c_prefix)s%(c_name)s, "%(name)s", &err);
 115 ''',
 116                          c_prefix=c_var(field_prefix), prefix=field_prefix,
 117                          type=type_name(argentry), c_name=c_var(argname),
 118                          name=argname)
 119
 120         if optional:
 121             pop_indent()
 122             ret += mcgen('''
 123 }
 124 ''')
 125         ret += mcgen('''
 126 if (err) {
 127     goto out;
 128 }
 129 ''')
 130
 131     pop_indent()
 132     if re.search('^ *goto out\\;', ret, re.MULTILINE):
 133         ret += mcgen('''
 134
 135 out:
 136 ''')
 137     ret += mcgen('''
 138     error_propagate(errp, err);
 139 }
 140 ''')
 141     return ret
 142
 143
 144 def generate_visit_struct_body(field_prefix, name, members):
 145     ret = mcgen('''
 146     Error *err = NULL;
 147
 148 ''')
 149
 150     if not field_prefix:
 151         full_name = name
 152     else:
 153         full_name = "%s_%s" % (field_prefix, name)
 154
 155     if len(field_prefix):
 156         ret += mcgen('''
 157     visit_start_struct(m, NULL, "", "%(name)s", 0, &err);
 158 ''',
 159                 name=name)
 160     else:
 161         ret += mcgen('''
 162     visit_start_struct(m, (void **)obj, "%(name)s", name, sizeof(%(name)s), &err);
 163 ''',
 164                 name=name)
 165
 166     ret += mcgen('''
 167     if (!err) {
 168         if (*obj) {
 169             visit_type_%(name)s_fields(m, obj, errp);
 170         }
 171         visit_end_struct(m, &err);
 172     }
 173     error_propagate(errp, err);
 174 ''',
 175         name=full_name)
 176
 177     return ret
 178
 179 def generate_visit_struct(expr):
 180
 181     name = expr['type']
 182     members = expr['data']
 183     base = expr.get('base')
 184
 185     ret = generate_visit_struct_fields(name, "", "", members, base)
 186
 187     ret += mcgen('''
 188
 189 void visit_type_%(name)s(Visitor *m, %(name)s ** obj, const char *name, Error **errp)
 190 {
 191 ''',
 192                 name=name)
 193
 194     ret += generate_visit_struct_body("", name, members)
 195
 196     ret += mcgen('''
 197 }
 198 ''')
 199     return ret
 200
 201 def generate_visit_list(name, members):
 202     return mcgen('''
 203
 204 void visit_type_%(name)sList(Visitor *m, %(name)sList ** obj, const char *name, Error **errp)
 205 {
 206     Error *err = NULL;
 207     GenericList *i, **prev;
 208
 209     visit_start_list(m, name, &err);
 210     if (err) {
 211         goto out;
 212     }
 213
 214     for (prev = (GenericList **)obj;
 215          !err && (i = visit_next_list(m, prev, &err)) != NULL;
 216          prev = &i) {
 217         %(name)sList *native_i = (%(name)sList *)i;
 218         visit_type_%(name)s(m, &native_i->value, NULL, &err);
 219     }
 220
 221     error_propagate(errp, err);
 222     err = NULL;
 223     visit_end_list(m, &err);
 224 out:
 225     error_propagate(errp, err);
 226 }
 227 ''',
 228                 name=name)
 229
 230 def generate_visit_enum(name, members):
 231     return mcgen('''
 232
 233 void visit_type_%(name)s(Visitor *m, %(name)s * obj, const char *name, Error **errp)
 234 {
 235     visit_type_enum(m, (int *)obj, %(name)s_lookup, "%(name)s", name, errp);
 236 }
 237 ''',
 238                  name=name)
 239
 240 def generate_visit_anon_union(name, members):
 241     ret = mcgen('''
 242
 243 void visit_type_%(name)s(Visitor *m, %(name)s ** obj, const char *name, Error **errp)
 244 {
 245     Error *err = NULL;
 246
 247     visit_start_implicit_struct(m, (void**) obj, sizeof(%(name)s), &err);
 248     if (err) {
 249         goto out;
 250     }
 251     visit_get_next_type(m, (int*) &(*obj)->kind, %(name)s_qtypes, name, &err);
 252     if (err) {
 253         goto out_end;
 254     }
 255     switch ((*obj)->kind) {
 256 ''',
 257     name=name)
 258
 259     # For anon union, always use the default enum type automatically generated
 260     # as "'%sKind' % (name)"
 261     disc_type = '%sKind' % (name)
 262
 263     for key in members:
 264         assert (members[key] in builtin_types
 265             or find_struct(members[key])
 266             or find_union(members[key])), "Invalid anonymous union member"
 267
 268         enum_full_value = generate_enum_full_value(disc_type, key)
 269         ret += mcgen('''
 270     case %(enum_full_value)s:
 271         visit_type_%(c_type)s(m, &(*obj)->%(c_name)s, name, &err);
 272         break;
 273 ''',
 274                 enum_full_value = enum_full_value,
 275                 c_type = type_name(members[key]),
 276                 c_name = c_fun(key))
 277
 278     ret += mcgen('''
 279     default:
 280         abort();
 281     }
 282 out_end:
 283     error_propagate(errp, err);
 284     err = NULL;
 285     visit_end_implicit_struct(m, &err);
 286 out:
 287     error_propagate(errp, err);
 288 }
 289 ''')
 290
 291     return ret
 292
 293
 294 def generate_visit_union(expr):
 295
 296     name = expr['union']
 297     members = expr['data']
 298
 299     base = expr.get('base')
 300     discriminator = expr.get('discriminator')
 301
 302     if discriminator == {}:
 303         assert not base
 304         return generate_visit_anon_union(name, members)
 305
 306     enum_define = discriminator_find_enum_define(expr)
 307     if enum_define:
 308         # Use the enum type as discriminator
 309         ret = ""
 310         disc_type = enum_define['enum_name']
 311     else:
 312         # There will always be a discriminator in the C switch code, by default it
 313         # is an enum type generated silently as "'%sKind' % (name)"
 314         ret = generate_visit_enum('%sKind' % name, members.keys())
 315         disc_type = '%sKind' % (name)
 316
 317     if base:
 318         base_fields = find_struct(base)['data']
 319         if discriminator:
 320             base_fields = base_fields.copy()
 321             del base_fields[discriminator]
 322         ret += generate_visit_struct_fields(name, "", "", base_fields)
 323
 324     if discriminator:
 325         for key in members:
 326             ret += generate_visit_implicit_struct(members[key])
 327
 328     ret += mcgen('''
 329
 330 void visit_type_%(name)s(Visitor *m, %(name)s ** obj, const char *name, Error **errp)
 331 {
 332     Error *err = NULL;
 333
 334     visit_start_struct(m, (void **)obj, "%(name)s", name, sizeof(%(name)s), &err);
 335     if (err) {
 336         goto out;
 337     }
 338     if (*obj) {
 339 ''',
 340                  name=name)
 341
 342     if base:
 343         ret += mcgen('''
 344         visit_type_%(name)s_fields(m, obj, &err);
 345         if (err) {
 346             goto out_obj;
 347         }
 348 ''',
 349             name=name)
 350
 351     if not discriminator:
 352         disc_key = "type"
 353     else:
 354         disc_key = discriminator
 355     ret += mcgen('''
 356         visit_type_%(disc_type)s(m, &(*obj)->kind, "%(disc_key)s", &err);
 357         if (err) {
 358             goto out_obj;
 359         }
 360         switch ((*obj)->kind) {
 361 ''',
 362                  disc_type = disc_type,
 363                  disc_key = disc_key)
 364
 365     for key in members:
 366         if not discriminator:
 367             fmt = 'visit_type_%(c_type)s(m, &(*obj)->%(c_name)s, "data", &err);'
 368         else:
 369             fmt = 'visit_type_implicit_%(c_type)s(m, &(*obj)->%(c_name)s, &err);'
 370
 371         enum_full_value = generate_enum_full_value(disc_type, key)
 372         ret += mcgen('''
 373         case %(enum_full_value)s:
 374             ''' + fmt + '''
 375             break;
 376 ''',
 377                 enum_full_value = enum_full_value,
 378                 c_type=type_name(members[key]),
 379                 c_name=c_fun(key))
 380
 381     ret += mcgen('''
 382         default:
 383             abort();
 384         }
 385 out_obj:
 386         error_propagate(errp, err);
 387         err = NULL;
 388     }
 389     visit_end_struct(m, &err);
 390 out:
 391     error_propagate(errp, err);
 392 }
 393 ''')
 394
 395     return ret
 396
 397 def generate_declaration(name, members, genlist=True, builtin_type=False):
 398     ret = ""
 399     if not builtin_type:
 400         ret += mcgen('''
 401
 402 void visit_type_%(name)s(Visitor *m, %(name)s ** obj, const char *name, Error **errp);
 403 ''',
 404                     name=name)
 405
 406     if genlist:
 407         ret += mcgen('''
 408 void visit_type_%(name)sList(Visitor *m, %(name)sList ** obj, const char *name, Error **errp);
 409 ''',
 410                  name=name)
 411
 412     return ret
 413
 414 def generate_enum_declaration(name, members, genlist=True):
 415     ret = ""
 416     if genlist:
 417         ret += mcgen('''
 418 void visit_type_%(name)sList(Visitor *m, %(name)sList ** obj, const char *name, Error **errp);
 419 ''',
 420                      name=name)
 421
 422     return ret
 423
 424 def generate_decl_enum(name, members, genlist=True):
 425     return mcgen('''
 426
 427 void visit_type_%(name)s(Visitor *m, %(name)s * obj, const char *name, Error **errp);
 428 ''',
 429                 name=name)
 430
 431 try:
 432     opts, args = getopt.gnu_getopt(sys.argv[1:], "chbp:i:o:",
 433                                    ["source", "header", "builtins", "prefix=",
 434                                     "input-file=", "output-dir="])
 435 except getopt.GetoptError, err:
 436     print str(err)
 437     sys.exit(1)
 438
 439 input_file = ""
 440 output_dir = ""
 441 prefix = ""
 442 c_file = 'qapi-visit.c'
 443 h_file = 'qapi-visit.h'
 444
 445 do_c = False
 446 do_h = False
 447 do_builtins = False
 448
 449 for o, a in opts:
 450     if o in ("-p", "--prefix"):
 451         prefix = a
 452     elif o in ("-i", "--input-file"):
 453         input_file = a
 454     elif o in ("-o", "--output-dir"):
 455         output_dir = a + "/"
 456     elif o in ("-c", "--source"):
 457         do_c = True
 458     elif o in ("-h", "--header"):
 459         do_h = True
 460     elif o in ("-b", "--builtins"):
 461         do_builtins = True
 462
 463 if not do_c and not do_h:
 464     do_c = True
 465     do_h = True
 466
 467 c_file = output_dir + prefix + c_file
 468 h_file = output_dir + prefix + h_file
 469
 470 try:
 471     os.makedirs(output_dir)
 472 except os.error, e:
 473     if e.errno != errno.EEXIST:
 474         raise
 475
 476 def maybe_open(really, name, opt):
 477     if really:
 478         return open(name, opt)
 479     else:
 480         import StringIO
 481         return StringIO.StringIO()
 482
 483 fdef = maybe_open(do_c, c_file, 'w')
 484 fdecl = maybe_open(do_h, h_file, 'w')
 485
 486 fdef.write(mcgen('''
 487 /* THIS FILE IS AUTOMATICALLY GENERATED, DO NOT MODIFY */
 488
 489 /*
 490  * schema-defined QAPI visitor functions
 491  *
 492  * Copyright IBM, Corp. 2011
 493  *
 494  * Authors:
 495  *  Anthony Liguori   <aliguori@us.ibm.com>
 496  *
 497  * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
 498  * See the COPYING.LIB file in the top-level directory.
 499  *
 500  */
 501
 502 #include "qemu-common.h"
 503 #include "%(header)s"
 504 ''',
 505                  header=basename(h_file)))
 506
 507 fdecl.write(mcgen('''
 508 /* THIS FILE IS AUTOMATICALLY GENERATED, DO NOT MODIFY */
 509
 510 /*
 511  * schema-defined QAPI visitor functions
 512  *
 513  * Copyright IBM, Corp. 2011
 514  *
 515  * Authors:
 516  *  Anthony Liguori   <aliguori@us.ibm.com>
 517  *
 518  * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
 519  * See the COPYING.LIB file in the top-level directory.
 520  *
 521  */
 522
 523 #ifndef %(guard)s
 524 #define %(guard)s
 525
 526 #include "qapi/visitor.h"
 527 #include "%(prefix)sqapi-types.h"
 528
 529 ''',
 530                   prefix=prefix, guard=guardname(h_file)))
 531
 532 exprs = parse_schema(input_file)
 533
 534 # to avoid header dependency hell, we always generate declarations
 535 # for built-in types in our header files and simply guard them
 536 fdecl.write(guardstart("QAPI_VISIT_BUILTIN_VISITOR_DECL"))
 537 for typename in builtin_types:
 538     fdecl.write(generate_declaration(typename, None, genlist=True,
 539                                      builtin_type=True))
 540 fdecl.write(guardend("QAPI_VISIT_BUILTIN_VISITOR_DECL"))
 541
 542 # ...this doesn't work for cases where we link in multiple objects that
 543 # have the functions defined, so we use -b option to provide control
 544 # over these cases
 545 if do_builtins:
 546     for typename in builtin_types:
 547         fdef.write(generate_visit_list(typename, None))
 548
 549 for expr in exprs:
 550     if expr.has_key('type'):
 551         ret = generate_visit_struct(expr)
 552         ret += generate_visit_list(expr['type'], expr['data'])
 553         fdef.write(ret)
 554
 555         ret = generate_declaration(expr['type'], expr['data'])
 556         fdecl.write(ret)
 557     elif expr.has_key('union'):
 558         ret = generate_visit_union(expr)
 559         ret += generate_visit_list(expr['union'], expr['data'])
 560         fdef.write(ret)
 561
 562         enum_define = discriminator_find_enum_define(expr)
 563         ret = ""
 564         if not enum_define:
 565             ret = generate_decl_enum('%sKind' % expr['union'],
 566                                      expr['data'].keys())
 567         ret += generate_declaration(expr['union'], expr['data'])
 568         fdecl.write(ret)
 569     elif expr.has_key('enum'):
 570         ret = generate_visit_list(expr['enum'], expr['data'])
 571         ret += generate_visit_enum(expr['enum'], expr['data'])
 572         fdef.write(ret)
 573
 574         ret = generate_decl_enum(expr['enum'], expr['data'])
 575         ret += generate_enum_declaration(expr['enum'], expr['data'])
 576         fdecl.write(ret)
 577
 578 fdecl.write('''
 579 #endif
 580 ''')
 581
 582 fdecl.flush()
 583 fdecl.close()
 584
 585 fdef.flush()
 586 fdef.close()