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 GPLv2.
  12 # See the COPYING.LIB file in the top-level directory.
  13
  14 from ordereddict import OrderedDict
  15 import sys
  16
  17 builtin_types = [
  18     'str', 'int', 'number', 'bool',
  19     'int8', 'int16', 'int32', 'int64',
  20     'uint8', 'uint16', 'uint32', 'uint64'
  21 ]
  22
  23 builtin_type_qtypes = {
  24     'str':      'QTYPE_QSTRING',
  25     'int':      'QTYPE_QINT',
  26     'number':   'QTYPE_QFLOAT',
  27     'bool':     'QTYPE_QBOOL',
  28     'int8':     'QTYPE_QINT',
  29     'int16':    'QTYPE_QINT',
  30     'int32':    'QTYPE_QINT',
  31     'int64':    'QTYPE_QINT',
  32     'uint8':    'QTYPE_QINT',
  33     'uint16':   'QTYPE_QINT',
  34     'uint32':   'QTYPE_QINT',
  35     'uint64':   'QTYPE_QINT',
  36 }
  37
  38 class QAPISchemaError(Exception):
  39     def __init__(self, schema, msg):
  40         self.fp = schema.fp
  41         self.msg = msg
  42         self.line = self.col = 1
  43         for ch in schema.src[0:schema.pos]:
  44             if ch == '\n':
  45                 self.line += 1
  46                 self.col = 1
  47             elif ch == '\t':
  48                 self.col = (self.col + 7) % 8 + 1
  49             else:
  50                 self.col += 1
  51
  52     def __str__(self):
  53         return "%s:%s:%s: %s" % (self.fp.name, self.line, self.col, self.msg)
  54
  55 class QAPISchema:
  56
  57     def __init__(self, fp):
  58         self.fp = fp
  59         self.src = fp.read()
  60         if self.src == '' or self.src[-1] != '\n':
  61             self.src += '\n'
  62         self.cursor = 0
  63         self.exprs = []
  64         self.accept()
  65
  66         while self.tok != None:
  67             self.exprs.append(self.get_expr(False))
  68
  69     def accept(self):
  70         while True:
  71             self.tok = self.src[self.cursor]
  72             self.pos = self.cursor
  73             self.cursor += 1
  74             self.val = None
  75
  76             if self.tok == '#':
  77                 self.cursor = self.src.find('\n', self.cursor)
  78             elif self.tok in ['{', '}', ':', ',', '[', ']']:
  79                 return
  80             elif self.tok == "'":
  81                 string = ''
  82                 esc = False
  83                 while True:
  84                     ch = self.src[self.cursor]
  85                     self.cursor += 1
  86                     if ch == '\n':
  87                         raise QAPISchemaError(self,
  88                                               'Missing terminating "\'"')
  89                     if esc:
  90                         string += ch
  91                         esc = False
  92                     elif ch == "\\":
  93                         esc = True
  94                     elif ch == "'":
  95                         self.val = string
  96                         return
  97                     else:
  98                         string += ch
  99             elif self.tok == '\n':
 100                 if self.cursor == len(self.src):
 101                     self.tok = None
 102                     return
 103             elif not self.tok.isspace():
 104                 raise QAPISchemaError(self, 'Stray "%s"' % self.tok)
 105
 106     def get_members(self):
 107         expr = OrderedDict()
 108         if self.tok == '}':
 109             self.accept()
 110             return expr
 111         if self.tok != "'":
 112             raise QAPISchemaError(self, 'Expected string or "}"')
 113         while True:
 114             key = self.val
 115             self.accept()
 116             if self.tok != ':':
 117                 raise QAPISchemaError(self, 'Expected ":"')
 118             self.accept()
 119             expr[key] = self.get_expr(True)
 120             if self.tok == '}':
 121                 self.accept()
 122                 return expr
 123             if self.tok != ',':
 124                 raise QAPISchemaError(self, 'Expected "," or "}"')
 125             self.accept()
 126             if self.tok != "'":
 127                 raise QAPISchemaError(self, 'Expected string')
 128
 129     def get_values(self):
 130         expr = []
 131         if self.tok == ']':
 132             self.accept()
 133             return expr
 134         if not self.tok in [ '{', '[', "'" ]:
 135             raise QAPISchemaError(self, 'Expected "{", "[", "]" or string')
 136         while True:
 137             expr.append(self.get_expr(True))
 138             if self.tok == ']':
 139                 self.accept()
 140                 return expr
 141             if self.tok != ',':
 142                 raise QAPISchemaError(self, 'Expected "," or "]"')
 143             self.accept()
 144
 145     def get_expr(self, nested):
 146         if self.tok != '{' and not nested:
 147             raise QAPISchemaError(self, 'Expected "{"')
 148         if self.tok == '{':
 149             self.accept()
 150             expr = self.get_members()
 151         elif self.tok == '[':
 152             self.accept()
 153             expr = self.get_values()
 154         elif self.tok == "'":
 155             expr = self.val
 156             self.accept()
 157         else:
 158             raise QAPISchemaError(self, 'Expected "{", "[" or string')
 159         return expr
 160
 161 def parse_schema(fp):
 162     try:
 163         schema = QAPISchema(fp)
 164     except QAPISchemaError as e:
 165         print >>sys.stderr, e
 166         exit(1)
 167
 168     exprs = []
 169
 170     for expr in schema.exprs:
 171         if expr.has_key('enum'):
 172             add_enum(expr['enum'])
 173         elif expr.has_key('union'):
 174             add_union(expr)
 175             add_enum('%sKind' % expr['union'])
 176         elif expr.has_key('type'):
 177             add_struct(expr)
 178         exprs.append(expr)
 179
 180     return exprs
 181
 182 def parse_args(typeinfo):
 183     if isinstance(typeinfo, basestring):
 184         struct = find_struct(typeinfo)
 185         assert struct != None
 186         typeinfo = struct['data']
 187
 188     for member in typeinfo:
 189         argname = member
 190         argentry = typeinfo[member]
 191         optional = False
 192         structured = False
 193         if member.startswith('*'):
 194             argname = member[1:]
 195             optional = True
 196         if isinstance(argentry, OrderedDict):
 197             structured = True
 198         yield (argname, argentry, optional, structured)
 199
 200 def de_camel_case(name):
 201     new_name = ''
 202     for ch in name:
 203         if ch.isupper() and new_name:
 204             new_name += '_'
 205         if ch == '-':
 206             new_name += '_'
 207         else:
 208             new_name += ch.lower()
 209     return new_name
 210
 211 def camel_case(name):
 212     new_name = ''
 213     first = True
 214     for ch in name:
 215         if ch in ['_', '-']:
 216             first = True
 217         elif first:
 218             new_name += ch.upper()
 219             first = False
 220         else:
 221             new_name += ch.lower()
 222     return new_name
 223
 224 def c_var(name, protect=True):
 225     # ANSI X3J11/88-090, 3.1.1
 226     c89_words = set(['auto', 'break', 'case', 'char', 'const', 'continue',
 227                      'default', 'do', 'double', 'else', 'enum', 'extern', 'float',
 228                      'for', 'goto', 'if', 'int', 'long', 'register', 'return',
 229                      'short', 'signed', 'sizeof', 'static', 'struct', 'switch',
 230                      'typedef', 'union', 'unsigned', 'void', 'volatile', 'while'])
 231     # ISO/IEC 9899:1999, 6.4.1
 232     c99_words = set(['inline', 'restrict', '_Bool', '_Complex', '_Imaginary'])
 233     # ISO/IEC 9899:2011, 6.4.1
 234     c11_words = set(['_Alignas', '_Alignof', '_Atomic', '_Generic', '_Noreturn',
 235                      '_Static_assert', '_Thread_local'])
 236     # GCC http://gcc.gnu.org/onlinedocs/gcc-4.7.1/gcc/C-Extensions.html
 237     # excluding _.*
 238     gcc_words = set(['asm', 'typeof'])
 239     # namespace pollution:
 240     polluted_words = set(['unix'])
 241     if protect and (name in c89_words | c99_words | c11_words | gcc_words | polluted_words):
 242         return "q_" + name
 243     return name.replace('-', '_').lstrip("*")
 244
 245 def c_fun(name, protect=True):
 246     return c_var(name, protect).replace('.', '_')
 247
 248 def c_list_type(name):
 249     return '%sList' % name
 250
 251 def type_name(name):
 252     if type(name) == list:
 253         return c_list_type(name[0])
 254     return name
 255
 256 enum_types = []
 257 struct_types = []
 258 union_types = []
 259
 260 def add_struct(definition):
 261     global struct_types
 262     struct_types.append(definition)
 263
 264 def find_struct(name):
 265     global struct_types
 266     for struct in struct_types:
 267         if struct['type'] == name:
 268             return struct
 269     return None
 270
 271 def add_union(definition):
 272     global union_types
 273     union_types.append(definition)
 274
 275 def find_union(name):
 276     global union_types
 277     for union in union_types:
 278         if union['union'] == name:
 279             return union
 280     return None
 281
 282 def add_enum(name):
 283     global enum_types
 284     enum_types.append(name)
 285
 286 def is_enum(name):
 287     global enum_types
 288     return (name in enum_types)
 289
 290 def c_type(name):
 291     if name == 'str':
 292         return 'char *'
 293     elif name == 'int':
 294         return 'int64_t'
 295     elif (name == 'int8' or name == 'int16' or name == 'int32' or
 296           name == 'int64' or name == 'uint8' or name == 'uint16' or
 297           name == 'uint32' or name == 'uint64'):
 298         return name + '_t'
 299     elif name == 'size':
 300         return 'uint64_t'
 301     elif name == 'bool':
 302         return 'bool'
 303     elif name == 'number':
 304         return 'double'
 305     elif type(name) == list:
 306         return '%s *' % c_list_type(name[0])
 307     elif is_enum(name):
 308         return name
 309     elif name == None or len(name) == 0:
 310         return 'void'
 311     elif name == name.upper():
 312         return '%sEvent *' % camel_case(name)
 313     else:
 314         return '%s *' % name
 315
 316 def genindent(count):
 317     ret = ""
 318     for i in range(count):
 319         ret += " "
 320     return ret
 321
 322 indent_level = 0
 323
 324 def push_indent(indent_amount=4):
 325     global indent_level
 326     indent_level += indent_amount
 327
 328 def pop_indent(indent_amount=4):
 329     global indent_level
 330     indent_level -= indent_amount
 331
 332 def cgen(code, **kwds):
 333     indent = genindent(indent_level)
 334     lines = code.split('\n')
 335     lines = map(lambda x: indent + x, lines)
 336     return '\n'.join(lines) % kwds + '\n'
 337
 338 def mcgen(code, **kwds):
 339     return cgen('\n'.join(code.split('\n')[1:-1]), **kwds)
 340
 341 def basename(filename):
 342     return filename.split("/")[-1]
 343
 344 def guardname(filename):
 345     guard = basename(filename).rsplit(".", 1)[0]
 346     for substr in [".", " ", "-"]:
 347         guard = guard.replace(substr, "_")
 348     return guard.upper() + '_H'
 349
 350 def guardstart(name):
 351     return mcgen('''
 352
 353 #ifndef %(name)s
 354 #define %(name)s
 355
 356 ''',
 357                  name=guardname(name))
 358
 359 def guardend(name):
 360     return mcgen('''
 361
 362 #endif /* %(name)s */
 363
 364 ''',
 365                  name=guardname(name))