scripts/qapi.py

   1 #
   2 # QAPI helper library
   3 #
   4 # Copyright IBM, Corp. 2011
   5 # Copyright (c) 2013 Red Hat Inc.
   6 #
   7 # Authors:
   8 #  Anthony Liguori <aliguori@us.ibm.com>
   9 #  Markus Armbruster <armbru@redhat.com>
  10 #
  11 # This work is licensed under the terms of the GNU GPL, version 2.
  12 # See the COPYING file in the top-level directory.
  13
  14 import re
  15 from ordereddict import OrderedDict
  16 import os
  17 import sys
  18
  19 builtin_types = [
  20     'str', 'int', 'number', 'bool',
  21     'int8', 'int16', 'int32', 'int64',
  22     'uint8', 'uint16', 'uint32', 'uint64'
  23 ]
  24
  25 builtin_type_qtypes = {
  26     'str':      'QTYPE_QSTRING',
  27     'int':      'QTYPE_QINT',
  28     'number':   'QTYPE_QFLOAT',
  29     'bool':     'QTYPE_QBOOL',
  30     'int8':     'QTYPE_QINT',
  31     'int16':    'QTYPE_QINT',
  32     'int32':    'QTYPE_QINT',
  33     'int64':    'QTYPE_QINT',
  34     'uint8':    'QTYPE_QINT',
  35     'uint16':   'QTYPE_QINT',
  36     'uint32':   'QTYPE_QINT',
  37     'uint64':   'QTYPE_QINT',
  38 }
  39
  40 def error_path(parent):
  41     res = ""
  42     while parent:
  43         res = ("In file included from %s:%d:\n" % (parent['file'],
  44                                                    parent['line'])) + res
  45         parent = parent['parent']
  46     return res
  47
  48 class QAPISchemaError(Exception):
  49     def __init__(self, schema, msg):
  50         self.input_file = schema.input_file
  51         self.msg = msg
  52         self.col = 1
  53         self.line = schema.line
  54         for ch in schema.src[schema.line_pos:schema.pos]:
  55             if ch == '\t':
  56                 self.col = (self.col + 7) % 8 + 1
  57             else:
  58                 self.col += 1
  59         self.info = schema.parent_info
  60
  61     def __str__(self):
  62         return error_path(self.info) + \
  63             "%s:%d:%d: %s" % (self.input_file, self.line, self.col, self.msg)
  64
  65 class QAPIExprError(Exception):
  66     def __init__(self, expr_info, msg):
  67         self.info = expr_info
  68         self.msg = msg
  69
  70     def __str__(self):
  71         return error_path(self.info['parent']) + \
  72             "%s:%d: %s" % (self.info['file'], self.info['line'], self.msg)
  73
  74 class QAPISchema:
  75
  76     def __init__(self, fp, input_relname=None, include_hist=[],
  77                  previously_included=[], parent_info=None):
  78         """ include_hist is a stack used to detect inclusion cycles
  79             previously_included is a global state used to avoid multiple
  80                                 inclusions of the same file"""
  81         input_fname = os.path.abspath(fp.name)
  82         if input_relname is None:
  83             input_relname = fp.name
  84         self.input_dir = os.path.dirname(input_fname)
  85         self.input_file = input_relname
  86         self.include_hist = include_hist + [(input_relname, input_fname)]
  87         previously_included.append(input_fname)
  88         self.parent_info = parent_info
  89         self.src = fp.read()
  90         if self.src == '' or self.src[-1] != '\n':
  91             self.src += '\n'
  92         self.cursor = 0
  93         self.line = 1
  94         self.line_pos = 0
  95         self.exprs = []
  96         self.accept()
  97
  98         while self.tok != None:
  99             expr_info = {'file': input_relname, 'line': self.line, 'parent': self.parent_info}
 100             expr = self.get_expr(False)
 101             if isinstance(expr, dict) and "include" in expr:
 102                 if len(expr) != 1:
 103                     raise QAPIExprError(expr_info, "Invalid 'include' directive")
 104                 include = expr["include"]
 105                 if not isinstance(include, str):
 106                     raise QAPIExprError(expr_info,
 107                                         'Expected a file name (string), got: %s'
 108                                         % include)
 109                 include_path = os.path.join(self.input_dir, include)
 110                 if any(include_path == elem[1]
 111                        for elem in self.include_hist):
 112                     raise QAPIExprError(expr_info, "Inclusion loop for %s"
 113                                         % include)
 114                 # skip multiple include of the same file
 115                 if include_path in previously_included:
 116                     continue
 117                 try:
 118                     fobj = open(include_path, 'r')
 119                 except IOError, e:
 120                     raise QAPIExprError(expr_info,
 121                                         '%s: %s' % (e.strerror, include))
 122                 exprs_include = QAPISchema(fobj, include, self.include_hist,
 123                                            previously_included, expr_info)
 124                 self.exprs.extend(exprs_include.exprs)
 125             else:
 126                 expr_elem = {'expr': expr,
 127                              'info': expr_info}
 128                 self.exprs.append(expr_elem)
 129
 130     def accept(self):
 131         while True:
 132             self.tok = self.src[self.cursor]
 133             self.pos = self.cursor
 134             self.cursor += 1
 135             self.val = None
 136
 137             if self.tok == '#':
 138                 self.cursor = self.src.find('\n', self.cursor)
 139             elif self.tok in ['{', '}', ':', ',', '[', ']']:
 140                 return
 141             elif self.tok == "'":
 142                 string = ''
 143                 esc = False
 144                 while True:
 145                     ch = self.src[self.cursor]
 146                     self.cursor += 1
 147                     if ch == '\n':
 148                         raise QAPISchemaError(self,
 149                                               'Missing terminating "\'"')
 150                     if esc:
 151                         string += ch
 152                         esc = False
 153                     elif ch == "\\":
 154                         esc = True
 155                     elif ch == "'":
 156                         self.val = string
 157                         return
 158                     else:
 159                         string += ch
 160             elif self.tok == '\n':
 161                 if self.cursor == len(self.src):
 162                     self.tok = None
 163                     return
 164                 self.line += 1
 165                 self.line_pos = self.cursor
 166             elif not self.tok.isspace():
 167                 raise QAPISchemaError(self, 'Stray "%s"' % self.tok)
 168
 169     def get_members(self):
 170         expr = OrderedDict()
 171         if self.tok == '}':
 172             self.accept()
 173             return expr
 174         if self.tok != "'":
 175             raise QAPISchemaError(self, 'Expected string or "}"')
 176         while True:
 177             key = self.val
 178             self.accept()
 179             if self.tok != ':':
 180                 raise QAPISchemaError(self, 'Expected ":"')
 181             self.accept()
 182             if key in expr:
 183                 raise QAPISchemaError(self, 'Duplicate key "%s"' % key)
 184             expr[key] = self.get_expr(True)
 185             if self.tok == '}':
 186                 self.accept()
 187                 return expr
 188             if self.tok != ',':
 189                 raise QAPISchemaError(self, 'Expected "," or "}"')
 190             self.accept()
 191             if self.tok != "'":
 192                 raise QAPISchemaError(self, 'Expected string')
 193
 194     def get_values(self):
 195         expr = []
 196         if self.tok == ']':
 197             self.accept()
 198             return expr
 199         if not self.tok in [ '{', '[', "'" ]:
 200             raise QAPISchemaError(self, 'Expected "{", "[", "]" or string')
 201         while True:
 202             expr.append(self.get_expr(True))
 203             if self.tok == ']':
 204                 self.accept()
 205                 return expr
 206             if self.tok != ',':
 207                 raise QAPISchemaError(self, 'Expected "," or "]"')
 208             self.accept()
 209
 210     def get_expr(self, nested):
 211         if self.tok != '{' and not nested:
 212             raise QAPISchemaError(self, 'Expected "{"')
 213         if self.tok == '{':
 214             self.accept()
 215             expr = self.get_members()
 216         elif self.tok == '[':
 217             self.accept()
 218             expr = self.get_values()
 219         elif self.tok == "'":
 220             expr = self.val
 221             self.accept()
 222         else:
 223             raise QAPISchemaError(self, 'Expected "{", "[" or string')
 224         return expr
 225
 226 def find_base_fields(base):
 227     base_struct_define = find_struct(base)
 228     if not base_struct_define:
 229         return None
 230     return base_struct_define['data']
 231
 232 # Return the discriminator enum define if discriminator is specified as an
 233 # enum type, otherwise return None.
 234 def discriminator_find_enum_define(expr):
 235     base = expr.get('base')
 236     discriminator = expr.get('discriminator')
 237
 238     if not (discriminator and base):
 239         return None
 240
 241     base_fields = find_base_fields(base)
 242     if not base_fields:
 243         return None
 244
 245     discriminator_type = base_fields.get(discriminator)
 246     if not discriminator_type:
 247         return None
 248
 249     return find_enum(discriminator_type)
 250
 251 def check_union(expr, expr_info):
 252     name = expr['union']
 253     base = expr.get('base')
 254     discriminator = expr.get('discriminator')
 255     members = expr['data']
 256
 257     # If the object has a member 'base', its value must name a complex type.
 258     if base:
 259         base_fields = find_base_fields(base)
 260         if not base_fields:
 261             raise QAPIExprError(expr_info,
 262                                 "Base '%s' is not a valid type"
 263                                 % base)
 264
 265     # If the union object has no member 'discriminator', it's an
 266     # ordinary union.
 267     if not discriminator:
 268         enum_define = None
 269
 270     # Else if the value of member 'discriminator' is {}, it's an
 271     # anonymous union.
 272     elif discriminator == {}:
 273         enum_define = None
 274
 275     # Else, it's a flat union.
 276     else:
 277         # The object must have a member 'base'.
 278         if not base:
 279             raise QAPIExprError(expr_info,
 280                                 "Flat union '%s' must have a base field"
 281                                 % name)
 282         # The value of member 'discriminator' must name a member of the
 283         # base type.
 284         discriminator_type = base_fields.get(discriminator)
 285         if not discriminator_type:
 286             raise QAPIExprError(expr_info,
 287                                 "Discriminator '%s' is not a member of base "
 288                                 "type '%s'"
 289                                 % (discriminator, base))
 290         enum_define = find_enum(discriminator_type)
 291         # Do not allow string discriminator
 292         if not enum_define:
 293             raise QAPIExprError(expr_info,
 294                                 "Discriminator '%s' must be of enumeration "
 295                                 "type" % discriminator)
 296
 297     # Check every branch
 298     for (key, value) in members.items():
 299         # If this named member's value names an enum type, then all members
 300         # of 'data' must also be members of the enum type.
 301         if enum_define and not key in enum_define['enum_values']:
 302             raise QAPIExprError(expr_info,
 303                                 "Discriminator value '%s' is not found in "
 304                                 "enum '%s'" %
 305                                 (key, enum_define["enum_name"]))
 306         # Todo: add checking for values. Key is checked as above, value can be
 307         # also checked here, but we need more functions to handle array case.
 308
 309 def check_exprs(schema):
 310     for expr_elem in schema.exprs:
 311         expr = expr_elem['expr']
 312         if expr.has_key('union'):
 313             check_union(expr, expr_elem['info'])
 314
 315 def parse_schema(input_file):
 316     try:
 317         schema = QAPISchema(open(input_file, "r"))
 318     except (QAPISchemaError, QAPIExprError), e:
 319         print >>sys.stderr, e
 320         exit(1)
 321
 322     exprs = []
 323
 324     for expr_elem in schema.exprs:
 325         expr = expr_elem['expr']
 326         if expr.has_key('enum'):
 327             add_enum(expr['enum'], expr['data'])
 328         elif expr.has_key('union'):
 329             add_union(expr)
 330         elif expr.has_key('type'):
 331             add_struct(expr)
 332         exprs.append(expr)
 333
 334     # Try again for hidden UnionKind enum
 335     for expr_elem in schema.exprs:
 336         expr = expr_elem['expr']
 337         if expr.has_key('union'):
 338             if not discriminator_find_enum_define(expr):
 339                 add_enum('%sKind' % expr['union'])
 340
 341     try:
 342         check_exprs(schema)
 343     except QAPIExprError, e:
 344         print >>sys.stderr, e
 345         exit(1)
 346
 347     return exprs
 348
 349 def parse_args(typeinfo):
 350     if isinstance(typeinfo, basestring):
 351         struct = find_struct(typeinfo)
 352         assert struct != None
 353         typeinfo = struct['data']
 354
 355     for member in typeinfo:
 356         argname = member
 357         argentry = typeinfo[member]
 358         optional = False
 359         structured = False
 360         if member.startswith('*'):
 361             argname = member[1:]
 362             optional = True
 363         if isinstance(argentry, OrderedDict):
 364             structured = True
 365         yield (argname, argentry, optional, structured)
 366
 367 def de_camel_case(name):
 368     new_name = ''
 369     for ch in name:
 370         if ch.isupper() and new_name:
 371             new_name += '_'
 372         if ch == '-':
 373             new_name += '_'
 374         else:
 375             new_name += ch.lower()
 376     return new_name
 377
 378 def camel_case(name):
 379     new_name = ''
 380     first = True
 381     for ch in name:
 382         if ch in ['_', '-']:
 383             first = True
 384         elif first:
 385             new_name += ch.upper()
 386             first = False
 387         else:
 388             new_name += ch.lower()
 389     return new_name
 390
 391 def c_var(name, protect=True):
 392     # ANSI X3J11/88-090, 3.1.1
 393     c89_words = set(['auto', 'break', 'case', 'char', 'const', 'continue',
 394                      'default', 'do', 'double', 'else', 'enum', 'extern', 'float',
 395                      'for', 'goto', 'if', 'int', 'long', 'register', 'return',
 396                      'short', 'signed', 'sizeof', 'static', 'struct', 'switch',
 397                      'typedef', 'union', 'unsigned', 'void', 'volatile', 'while'])
 398     # ISO/IEC 9899:1999, 6.4.1
 399     c99_words = set(['inline', 'restrict', '_Bool', '_Complex', '_Imaginary'])
 400     # ISO/IEC 9899:2011, 6.4.1
 401     c11_words = set(['_Alignas', '_Alignof', '_Atomic', '_Generic', '_Noreturn',
 402                      '_Static_assert', '_Thread_local'])
 403     # GCC http://gcc.gnu.org/onlinedocs/gcc-4.7.1/gcc/C-Extensions.html
 404     # excluding _.*
 405     gcc_words = set(['asm', 'typeof'])
 406     # C++ ISO/IEC 14882:2003 2.11
 407     cpp_words = set(['bool', 'catch', 'class', 'const_cast', 'delete',
 408                      'dynamic_cast', 'explicit', 'false', 'friend', 'mutable',
 409                      'namespace', 'new', 'operator', 'private', 'protected',
 410                      'public', 'reinterpret_cast', 'static_cast', 'template',
 411                      'this', 'throw', 'true', 'try', 'typeid', 'typename',
 412                      'using', 'virtual', 'wchar_t',
 413                      # alternative representations
 414                      'and', 'and_eq', 'bitand', 'bitor', 'compl', 'not',
 415                      'not_eq', 'or', 'or_eq', 'xor', 'xor_eq'])
 416     # namespace pollution:
 417     polluted_words = set(['unix', 'errno'])
 418     if protect and (name in c89_words | c99_words | c11_words | gcc_words | cpp_words | polluted_words):
 419         return "q_" + name
 420     return name.replace('-', '_').lstrip("*")
 421
 422 def c_fun(name, protect=True):
 423     return c_var(name, protect).replace('.', '_')
 424
 425 def c_list_type(name):
 426     return '%sList' % name
 427
 428 def type_name(name):
 429     if type(name) == list:
 430         return c_list_type(name[0])
 431     return name
 432
 433 enum_types = []
 434 struct_types = []
 435 union_types = []
 436
 437 def add_struct(definition):
 438     global struct_types
 439     struct_types.append(definition)
 440
 441 def find_struct(name):
 442     global struct_types
 443     for struct in struct_types:
 444         if struct['type'] == name:
 445             return struct
 446     return None
 447
 448 def add_union(definition):
 449     global union_types
 450     union_types.append(definition)
 451
 452 def find_union(name):
 453     global union_types
 454     for union in union_types:
 455         if union['union'] == name:
 456             return union
 457     return None
 458
 459 def add_enum(name, enum_values = None):
 460     global enum_types
 461     enum_types.append({"enum_name": name, "enum_values": enum_values})
 462
 463 def find_enum(name):
 464     global enum_types
 465     for enum in enum_types:
 466         if enum['enum_name'] == name:
 467             return enum
 468     return None
 469
 470 def is_enum(name):
 471     return find_enum(name) != None
 472
 473 def c_type(name):
 474     if name == 'str':
 475         return 'char *'
 476     elif name == 'int':
 477         return 'int64_t'
 478     elif (name == 'int8' or name == 'int16' or name == 'int32' or
 479           name == 'int64' or name == 'uint8' or name == 'uint16' or
 480           name == 'uint32' or name == 'uint64'):
 481         return name + '_t'
 482     elif name == 'size':
 483         return 'uint64_t'
 484     elif name == 'bool':
 485         return 'bool'
 486     elif name == 'number':
 487         return 'double'
 488     elif type(name) == list:
 489         return '%s *' % c_list_type(name[0])
 490     elif is_enum(name):
 491         return name
 492     elif name == None or len(name) == 0:
 493         return 'void'
 494     elif name == name.upper():
 495         return '%sEvent *' % camel_case(name)
 496     else:
 497         return '%s *' % name
 498
 499 def genindent(count):
 500     ret = ""
 501     for i in range(count):
 502         ret += " "
 503     return ret
 504
 505 indent_level = 0
 506
 507 def push_indent(indent_amount=4):
 508     global indent_level
 509     indent_level += indent_amount
 510
 511 def pop_indent(indent_amount=4):
 512     global indent_level
 513     indent_level -= indent_amount
 514
 515 def cgen(code, **kwds):
 516     indent = genindent(indent_level)
 517     lines = code.split('\n')
 518     lines = map(lambda x: indent + x, lines)
 519     return '\n'.join(lines) % kwds + '\n'
 520
 521 def mcgen(code, **kwds):
 522     return cgen('\n'.join(code.split('\n')[1:-1]), **kwds)
 523
 524 def basename(filename):
 525     return filename.split("/")[-1]
 526
 527 def guardname(filename):
 528     guard = basename(filename).rsplit(".", 1)[0]
 529     for substr in [".", " ", "-"]:
 530         guard = guard.replace(substr, "_")
 531     return guard.upper() + '_H'
 532
 533 def guardstart(name):
 534     return mcgen('''
 535
 536 #ifndef %(name)s
 537 #define %(name)s
 538
 539 ''',
 540                  name=guardname(name))
 541
 542 def guardend(name):
 543     return mcgen('''
 544
 545 #endif /* %(name)s */
 546
 547 ''',
 548                  name=guardname(name))
 549
 550 # ENUMName -> ENUM_NAME, EnumName1 -> ENUM_NAME1
 551 # ENUM_NAME -> ENUM_NAME, ENUM_NAME1 -> ENUM_NAME1, ENUM_Name2 -> ENUM_NAME2
 552 # ENUM24_Name -> ENUM24_NAME
 553 def _generate_enum_string(value):
 554     c_fun_str = c_fun(value, False)
 555     if value.isupper():
 556         return c_fun_str
 557
 558     new_name = ''
 559     l = len(c_fun_str)
 560     for i in range(l):
 561         c = c_fun_str[i]
 562         # When c is upper and no "_" appears before, do more checks
 563         if c.isupper() and (i > 0) and c_fun_str[i - 1] != "_":
 564             # Case 1: next string is lower
 565             # Case 2: previous string is digit
 566             if (i < (l - 1) and c_fun_str[i + 1].islower()) or \
 567             c_fun_str[i - 1].isdigit():
 568                 new_name += '_'
 569         new_name += c
 570     return new_name.lstrip('_').upper()
 571
 572 def generate_enum_full_value(enum_name, enum_value):
 573     abbrev_string = _generate_enum_string(enum_name)
 574     value_string = _generate_enum_string(enum_value)
 575     return "%s_%s" % (abbrev_string, value_string)