summaryrefslogtreecommitdiffstats
path: root/scripts/qapi.py
blob: 0079194169693f1978d0d02468c0e6d84e1a140f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
#
# QAPI helper library
#
# Copyright IBM, Corp. 2011
# Copyright (c) 2013 Red Hat Inc.
#
# Authors:
#  Anthony Liguori <aliguori@us.ibm.com>
#  Markus Armbruster <armbru@redhat.com>
#
# This work is licensed under the terms of the GNU GPL, version 2.
# See the COPYING file in the top-level directory.

import re
from ordereddict import OrderedDict
import os
import sys

builtin_types = [
    'str', 'int', 'number', 'bool',
    'int8', 'int16', 'int32', 'int64',
    'uint8', 'uint16', 'uint32', 'uint64'
]

builtin_type_qtypes = {
    'str':      'QTYPE_QSTRING',
    'int':      'QTYPE_QINT',
    'number':   'QTYPE_QFLOAT',
    'bool':     'QTYPE_QBOOL',
    'int8':     'QTYPE_QINT',
    'int16':    'QTYPE_QINT',
    'int32':    'QTYPE_QINT',
    'int64':    'QTYPE_QINT',
    'uint8':    'QTYPE_QINT',
    'uint16':   'QTYPE_QINT',
    'uint32':   'QTYPE_QINT',
    'uint64':   'QTYPE_QINT',
}

def error_path(parent):
    res = ""
    while parent:
        res = ("In file included from %s:%d:\n" % (parent['file'],
                                                   parent['line'])) + res
        parent = parent['parent']
    return res

class QAPISchemaError(Exception):
    def __init__(self, schema, msg):
        self.input_file = schema.input_file
        self.msg = msg
        self.col = 1
        self.line = schema.line
        for ch in schema.src[schema.line_pos:schema.pos]:
            if ch == '\t':
                self.col = (self.col + 7) % 8 + 1
            else:
                self.col += 1
        self.info = schema.parent_info

    def __str__(self):
        return error_path(self.info) + \
            "%s:%d:%d: %s" % (self.input_file, self.line, self.col, self.msg)

class QAPIExprError(Exception):
    def __init__(self, expr_info, msg):
        self.info = expr_info
        self.msg = msg

    def __str__(self):
        return error_path(self.info['parent']) + \
            "%s:%d: %s" % (self.info['file'], self.info['line'], self.msg)

class QAPISchema:

    def __init__(self, fp, input_relname=None, include_hist=[],
                 previously_included=[], parent_info=None):
        """ include_hist is a stack used to detect inclusion cycles
            previously_included is a global state used to avoid multiple
                                inclusions of the same file"""
        input_fname = os.path.abspath(fp.name)
        if input_relname is None:
            input_relname = fp.name
        self.input_dir = os.path.dirname(input_fname)
        self.input_file = input_relname
        self.include_hist = include_hist + [(input_relname, input_fname)]
        previously_included.append(input_fname)
        self.parent_info = parent_info
        self.src = fp.read()
        if self.src == '' or self.src[-1] != '\n':
            self.src += '\n'
        self.cursor = 0
        self.line = 1
        self.line_pos = 0
        self.exprs = []
        self.accept()

        while self.tok != None:
            expr_info = {'file': input_relname, 'line': self.line, 'parent': self.parent_info}
            expr = self.get_expr(False)
            if isinstance(expr, dict) and "include" in expr:
                if len(expr) != 1:
                    raise QAPIExprError(expr_info, "Invalid 'include' directive")
                include = expr["include"]
                if not isinstance(include, str):
                    raise QAPIExprError(expr_info,
                                        'Expected a file name (string), got: %s'
                                        % include)
                include_path = os.path.join(self.input_dir, include)
                if any(include_path == elem[1]
                       for elem in self.include_hist):
                    raise QAPIExprError(expr_info, "Inclusion loop for %s"
                                        % include)
                # skip multiple include of the same file
                if include_path in previously_included:
                    continue
                try:
                    fobj = open(include_path, 'r')
                except IOError, e:
                    raise QAPIExprError(expr_info,
                                        '%s: %s' % (e.strerror, include))
                exprs_include = QAPISchema(fobj, include, self.include_hist,
                                           previously_included, expr_info)
                self.exprs.extend(exprs_include.exprs)
            else:
                expr_elem = {'expr': expr,
                             'info': expr_info}
                self.exprs.append(expr_elem)

    def accept(self):
        while True:
            self.tok = self.src[self.cursor]
            self.pos = self.cursor
            self.cursor += 1
            self.val = None

            if self.tok == '#':
                self.cursor = self.src.find('\n', self.cursor)
            elif self.tok in ['{', '}', ':', ',', '[', ']']:
                return
            elif self.tok == "'":
                string = ''
                esc = False
                while True:
                    ch = self.src[self.cursor]
                    self.cursor += 1
                    if ch == '\n':
                        raise QAPISchemaError(self,
                                              'Missing terminating "\'"')
                    if esc:
                        string += ch
                        esc = False
                    elif ch == "\\":
                        esc = True
                    elif ch == "'":
                        self.val = string
                        return
                    else:
                        string += ch
            elif self.tok == '\n':
                if self.cursor == len(self.src):
                    self.tok = None
                    return
                self.line += 1
                self.line_pos = self.cursor
            elif not self.tok.isspace():
                raise QAPISchemaError(self, 'Stray "%s"' % self.tok)

    def get_members(self):
        expr = OrderedDict()
        if self.tok == '}':
            self.accept()
            return expr
        if self.tok != "'":
            raise QAPISchemaError(self, 'Expected string or "}"')
        while True:
            key = self.val
            self.accept()
            if self.tok != ':':
                raise QAPISchemaError(self, 'Expected ":"')
            self.accept()
            if key in expr:
                raise QAPISchemaError(self, 'Duplicate key "%s"' % key)
            expr[key] = self.get_expr(True)
            if self.tok == '}':
                self.accept()
                return expr
            if self.tok != ',':
                raise QAPISchemaError(self, 'Expected "," or "}"')
            self.accept()
            if self.tok != "'":
                raise QAPISchemaError(self, 'Expected string')

    def get_values(self):
        expr = []
        if self.tok == ']':
            self.accept()
            return expr
        if not self.tok in [ '{', '[', "'" ]:
            raise QAPISchemaError(self, 'Expected "{", "[", "]" or string')
        while True:
            expr.append(self.get_expr(True))
            if self.tok == ']':
                self.accept()
                return expr
            if self.tok != ',':
                raise QAPISchemaError(self, 'Expected "," or "]"')
            self.accept()

    def get_expr(self, nested):
        if self.tok != '{' and not nested:
            raise QAPISchemaError(self, 'Expected "{"')
        if self.tok == '{':
            self.accept()
            expr = self.get_members()
        elif self.tok == '[':
            self.accept()
            expr = self.get_values()
        elif self.tok == "'":
            expr = self.val
            self.accept()
        else:
            raise QAPISchemaError(self, 'Expected "{", "[" or string')
        return expr

def find_base_fields(base):
    base_struct_define = find_struct(base)
    if not base_struct_define:
        return None
    return base_struct_define['data']

# Return the discriminator enum define if discriminator is specified as an
# enum type, otherwise return None.
def discriminator_find_enum_define(expr):
    base = expr.get('base')
    discriminator = expr.get('discriminator')

    if not (discriminator and base):
        return None

    base_fields = find_base_fields(base)
    if not base_fields:
        return None

    discriminator_type = base_fields.get(discriminator)
    if not discriminator_type:
        return None

    return find_enum(discriminator_type)

def check_union(expr, expr_info):
    name = expr['union']
    base = expr.get('base')
    discriminator = expr.get('discriminator')
    members = expr['data']

    # If the object has a member 'base', its value must name a complex type.
    if base:
        base_fields = find_base_fields(base)
        if not base_fields:
            raise QAPIExprError(expr_info,
                                "Base '%s' is not a valid type"
                                % base)

    # If the union object has no member 'discriminator', it's an
    # ordinary union.
    if not discriminator:
        enum_define = None

    # Else if the value of member 'discriminator' is {}, it's an
    # anonymous union.
    elif discriminator == {}:
        enum_define = None

    # Else, it's a flat union.
    else:
        # The object must have a member 'base'.
        if not base:
            raise QAPIExprError(expr_info,
                                "Flat union '%s' must have a base field"
                                % name)
        # The value of member 'discriminator' must name a member of the
        # base type.
        discriminator_type = base_fields.get(discriminator)
        if not discriminator_type:
            raise QAPIExprError(expr_info,
                                "Discriminator '%s' is not a member of base "
                                "type '%s'"
                                % (discriminator, base))
        enum_define = find_enum(discriminator_type)
        # Do not allow string discriminator
        if not enum_define:
            raise QAPIExprError(expr_info,
                                "Discriminator '%s' must be of enumeration "
                                "type" % discriminator)

    # Check every branch
    for (key, value) in members.items():
        # If this named member's value names an enum type, then all members
        # of 'data' must also be members of the enum type.
        if enum_define and not key in enum_define['enum_values']:
            raise QAPIExprError(expr_info,
                                "Discriminator value '%s' is not found in "
                                "enum '%s'" %
                                (key, enum_define["enum_name"]))
        # Todo: add checking for values. Key is checked as above, value can be
        # also checked here, but we need more functions to handle array case.

def check_exprs(schema):
    for expr_elem in schema.exprs:
        expr = expr_elem['expr']
        if expr.has_key('union'):
            check_union(expr, expr_elem['info'])

def parse_schema(input_file):
    try:
        schema = QAPISchema(open(input_file, "r"))
    except (QAPISchemaError, QAPIExprError), e:
        print >>sys.stderr, e
        exit(1)

    exprs = []

    for expr_elem in schema.exprs:
        expr = expr_elem['expr']
        if expr.has_key('enum'):
            add_enum(expr['enum'], expr['data'])
        elif expr.has_key('union'):
            add_union(expr)
        elif expr.has_key('type'):
            add_struct(expr)
        exprs.append(expr)

    # Try again for hidden UnionKind enum
    for expr_elem in schema.exprs:
        expr = expr_elem['expr']
        if expr.has_key('union'):
            if not discriminator_find_enum_define(expr):
                add_enum('%sKind' % expr['union'])

    try:
        check_exprs(schema)
    except QAPIExprError, e:
        print >>sys.stderr, e
        exit(1)

    return exprs

def parse_args(typeinfo):
    if isinstance(typeinfo, basestring):
        struct = find_struct(typeinfo)
        assert struct != None
        typeinfo = struct['data']

    for member in typeinfo:
        argname = member
        argentry = typeinfo[member]
        optional = False
        structured = False
        if member.startswith('*'):
            argname = member[1:]
            optional = True
        if isinstance(argentry, OrderedDict):
            structured = True
        yield (argname, argentry, optional, structured)

def de_camel_case(name):
    new_name = ''
    for ch in name:
        if ch.isupper() and new_name:
            new_name += '_'
        if ch == '-':
            new_name += '_'
        else:
            new_name += ch.lower()
    return new_name

def camel_case(name):
    new_name = ''
    first = True
    for ch in name:
        if ch in ['_', '-']:
            first = True
        elif first:
            new_name += ch.upper()
            first = False
        else:
            new_name += ch.lower()
    return new_name

def c_var(name, protect=True):
    # ANSI X3J11/88-090, 3.1.1
    c89_words = set(['auto', 'break', 'case', 'char', 'const', 'continue',
                     'default', 'do', 'double', 'else', 'enum', 'extern', 'float',
                     'for', 'goto', 'if', 'int', 'long', 'register', 'return',
                     'short', 'signed', 'sizeof', 'static', 'struct', 'switch',
                     'typedef', 'union', 'unsigned', 'void', 'volatile', 'while'])
    # ISO/IEC 9899:1999, 6.4.1
    c99_words = set(['inline', 'restrict', '_Bool', '_Complex', '_Imaginary'])
    # ISO/IEC 9899:2011, 6.4.1
    c11_words = set(['_Alignas', '_Alignof', '_Atomic', '_Generic', '_Noreturn',
                     '_Static_assert', '_Thread_local'])
    # GCC http://gcc.gnu.org/onlinedocs/gcc-4.7.1/gcc/C-Extensions.html
    # excluding _.*
    gcc_words = set(['asm', 'typeof'])
    # C++ ISO/IEC 14882:2003 2.11
    cpp_words = set(['bool', 'catch', 'class', 'const_cast', 'delete',
                     'dynamic_cast', 'explicit', 'false', 'friend', 'mutable',
                     'namespace', 'new', 'operator', 'private', 'protected',
                     'public', 'reinterpret_cast', 'static_cast', 'template',
                     'this', 'throw', 'true', 'try', 'typeid', 'typename',
                     'using', 'virtual', 'wchar_t',
                     # alternative representations
                     'and', 'and_eq', 'bitand', 'bitor', 'compl', 'not',
                     'not_eq', 'or', 'or_eq', 'xor', 'xor_eq'])
    # namespace pollution:
    polluted_words = set(['unix', 'errno'])
    if protect and (name in c89_words | c99_words | c11_words | gcc_words | cpp_words | polluted_words):
        return "q_" + name
    return name.replace('-', '_').lstrip("*")

def c_fun(name, protect=True):
    return c_var(name, protect).replace('.', '_')

def c_list_type(name):
    return '%sList' % name

def type_name(name):
    if type(name) == list:
        return c_list_type(name[0])
    return name

enum_types = []
struct_types = []
union_types = []

def add_struct(definition):
    global struct_types
    struct_types.append(definition)

def find_struct(name):
    global struct_types
    for struct in struct_types:
        if struct['type'] == name:
            return struct
    return None

def add_union(definition):
    global union_types
    union_types.append(definition)

def find_union(name):
    global union_types
    for union in union_types:
        if union['union'] == name:
            return union
    return None

def add_enum(name, enum_values = None):
    global enum_types
    enum_types.append({"enum_name": name, "enum_values": enum_values})

def find_enum(name):
    global enum_types
    for enum in enum_types:
        if enum['enum_name'] == name:
            return enum
    return None

def is_enum(name):
    return find_enum(name) != None

eatspace = '\033EATSPACE.'

# A special suffix is added in c_type() for pointer types, and it's
# stripped in mcgen(). So please notice this when you check the return
# value of c_type() outside mcgen().
def c_type(name, is_param=False):
    if name == 'str':
        if is_param:
            return 'const char *' + eatspace
        return 'char *' + eatspace

    elif name == 'int':
        return 'int64_t'
    elif (name == 'int8' or name == 'int16' or name == 'int32' or
          name == 'int64' or name == 'uint8' or name == 'uint16' or
          name == 'uint32' or name == 'uint64'):
        return name + '_t'
    elif name == 'size':
        return 'uint64_t'
    elif name == 'bool':
        return 'bool'
    elif name == 'number':
        return 'double'
    elif type(name) == list:
        return '%s *%s' % (c_list_type(name[0]), eatspace)
    elif is_enum(name):
        return name
    elif name == None or len(name) == 0:
        return 'void'
    elif name == name.upper():
        return '%sEvent *%s' % (camel_case(name), eatspace)
    else:
        return '%s *%s' % (name, eatspace)

def is_c_ptr(name):
    suffix = "*" + eatspace
    return c_type(name).endswith(suffix)

def genindent(count):
    ret = ""
    for i in range(count):
        ret += " "
    return ret

indent_level = 0

def push_indent(indent_amount=4):
    global indent_level
    indent_level += indent_amount

def pop_indent(indent_amount=4):
    global indent_level
    indent_level -= indent_amount

def cgen(code, **kwds):
    indent = genindent(indent_level)
    lines = code.split('\n')
    lines = map(lambda x: indent + x, lines)
    return '\n'.join(lines) % kwds + '\n'

def mcgen(code, **kwds):
    raw = cgen('\n'.join(code.split('\n')[1:-1]), **kwds)
    return re.sub(re.escape(eatspace) + ' *', '', raw)

def basename(filename):
    return filename.split("/")[-1]

def guardname(filename):
    guard = basename(filename).rsplit(".", 1)[0]
    for substr in [".", " ", "-"]:
        guard = guard.replace(substr, "_")
    return guard.upper() + '_H'

def guardstart(name):
    return mcgen('''

#ifndef %(name)s
#define %(name)s

''',
                 name=guardname(name))

def guardend(name):
    return mcgen('''

#endif /* %(name)s */

''',
                 name=guardname(name))

# ENUMName -> ENUM_NAME, EnumName1 -> ENUM_NAME1
# ENUM_NAME -> ENUM_NAME, ENUM_NAME1 -> ENUM_NAME1, ENUM_Name2 -> ENUM_NAME2
# ENUM24_Name -> ENUM24_NAME
def _generate_enum_string(value):
    c_fun_str = c_fun(value, False)
    if value.isupper():
        return c_fun_str

    new_name = ''
    l = len(c_fun_str)
    for i in range(l):
        c = c_fun_str[i]
        # When c is upper and no "_" appears before, do more checks
        if c.isupper() and (i > 0) and c_fun_str[i - 1] != "_":
            # Case 1: next string is lower
            # Case 2: previous string is digit
            if (i < (l - 1) and c_fun_str[i + 1].islower()) or \
            c_fun_str[i - 1].isdigit():
                new_name += '_'
        new_name += c
    return new_name.lstrip('_').upper()

def generate_enum_full_value(enum_name, enum_value):
    abbrev_string = _generate_enum_string(enum_name)
    value_string = _generate_enum_string(enum_value)
    return "%s_%s" % (abbrev_string, value_string)
OpenPOWER on IntegriCloud