cffi / testing / test_verify.py

  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
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
import py
import sys, math
from cffi import FFI, VerificationError, VerificationMissing, model


if sys.platform != 'win32':
    class FFI(FFI):
        def verify(self, *args, **kwds):
            # XXX a GCC-only way to say "crash upon warnings too"
            return super(FFI, self).verify(
                *args, extra_compile_args=['-Werror'], **kwds)

def setup_module():
    import cffi.verifier
    cffi.verifier.cleanup_tmpdir()


def test_missing_function():
    ffi = FFI()
    ffi.cdef("void some_completely_unknown_function();")
    py.test.raises(VerificationError, ffi.verify)

def test_simple_case():
    ffi = FFI()
    ffi.cdef("double sin(double x);")
    lib = ffi.verify('#include <math.h>')
    assert lib.sin(1.23) == math.sin(1.23)

def test_rounding_1():
    ffi = FFI()
    ffi.cdef("float sin(double x);")
    lib = ffi.verify('#include <math.h>')
    res = lib.sin(1.23)
    assert res != math.sin(1.23)     # not exact, because of double->float
    assert abs(res - math.sin(1.23)) < 1E-5

def test_rounding_2():
    ffi = FFI()
    ffi.cdef("double sin(float x);")
    lib = ffi.verify('#include <math.h>')
    res = lib.sin(1.23)
    assert res != math.sin(1.23)     # not exact, because of double->float
    assert abs(res - math.sin(1.23)) < 1E-5

def test_strlen_exact():
    ffi = FFI()
    ffi.cdef("size_t strlen(const char *s);")
    lib = ffi.verify("#include <string.h>")
    assert lib.strlen(b"hi there!") == 9

def test_strlen_approximate():
    ffi = FFI()
    ffi.cdef("int strlen(char *s);")
    lib = ffi.verify("#include <string.h>")
    assert lib.strlen(b"hi there!") == 9

def test_strlen_array_of_char():
    ffi = FFI()
    ffi.cdef("int strlen(char[]);")
    lib = ffi.verify("#include <string.h>")
    assert lib.strlen(b"hello") == 5


all_integer_types = ['short', 'int', 'long', 'long long',
                     'signed char', 'unsigned char',
                     'unsigned short', 'unsigned int',
                     'unsigned long', 'unsigned long long']
all_signed_integer_types = [_typename for _typename in all_integer_types
                                      if not _typename.startswith('unsigned ')]
all_unsigned_integer_types = [_typename for _typename in all_integer_types
                                        if _typename.startswith('unsigned ')]
all_float_types = ['float', 'double']

def test_primitive_category():
    for typename in all_integer_types + all_float_types + ['char', 'wchar_t']:
        tp = model.PrimitiveType(typename)
        assert tp.is_char_type() == (typename in ('char', 'wchar_t'))
        assert tp.is_signed_type() == (typename in all_signed_integer_types)
        assert tp.is_unsigned_type()== (typename in all_unsigned_integer_types)
        assert tp.is_integer_type() == (typename in all_integer_types)
        assert tp.is_float_type() == (typename in all_float_types)

def test_all_integer_and_float_types():
    for typename in all_integer_types + all_float_types:
        ffi = FFI()
        ffi.cdef("%s foo(%s);" % (typename, typename))
        lib = ffi.verify("%s foo(%s x) { return x+1; }" % (typename, typename))
        assert lib.foo(42) == 43
        if sys.version < '3':
            assert lib.foo(long(44)) == 45
        assert lib.foo(ffi.cast(typename, 46)) == 47
        py.test.raises(TypeError, lib.foo, ffi.NULL)
        #
        # check for overflow cases
        if typename in all_float_types:
            continue
        for value in [-2**80, -2**40, -2**20, -2**10, -2**5, -1,
                      2**5, 2**10, 2**20, 2**40, 2**80]:
            overflows = int(ffi.cast(typename, value)) != value
            if overflows:
                py.test.raises(OverflowError, lib.foo, value)
            else:
                assert lib.foo(value) == value + 1

def test_char_type():
    ffi = FFI()
    ffi.cdef("char foo(char);")
    lib = ffi.verify("char foo(char x) { return x+1; }")
    assert lib.foo(b"A") == b"B"
    py.test.raises(TypeError, lib.foo, b"bar")
    py.test.raises(TypeError, lib.foo, "bar")

def test_wchar_type():
    ffi = FFI()
    if ffi.sizeof('wchar_t') == 2:
        uniexample1 = u'\u1234'
        uniexample2 = u'\u1235'
    else:
        uniexample1 = u'\U00012345'
        uniexample2 = u'\U00012346'
    #
    ffi.cdef("wchar_t foo(wchar_t);")
    lib = ffi.verify("wchar_t foo(wchar_t x) { return x+1; }")
    assert lib.foo(uniexample1) == uniexample2

def test_no_argument():
    ffi = FFI()
    ffi.cdef("int foo(void);")
    lib = ffi.verify("int foo(void) { return 42; }")
    assert lib.foo() == 42

def test_two_arguments():
    ffi = FFI()
    ffi.cdef("int foo(int, int);")
    lib = ffi.verify("int foo(int a, int b) { return a - b; }")
    assert lib.foo(40, -2) == 42

def test_macro():
    ffi = FFI()
    ffi.cdef("int foo(int, int);")
    lib = ffi.verify("#define foo(a, b) ((a) * (b))")
    assert lib.foo(-6, -7) == 42

def test_ptr():
    ffi = FFI()
    ffi.cdef("int *foo(int *);")
    lib = ffi.verify("int *foo(int *a) { return a; }")
    assert lib.foo(ffi.NULL) == ffi.NULL
    p = ffi.new("int *", 42)
    q = ffi.new("int *", 42)
    assert lib.foo(p) == p
    assert lib.foo(q) != p

def test_bogus_ptr():
    ffi = FFI()
    ffi.cdef("int *foo(int *);")
    lib = ffi.verify("int *foo(int *a) { return a; }")
    py.test.raises(TypeError, lib.foo, ffi.new("short *", 42))


def test_verify_typedefs():
    py.test.skip("ignored so far")
    types = ['signed char', 'unsigned char', 'int', 'long']
    for cdefed in types:
        for real in types:
            ffi = FFI()
            ffi.cdef("typedef %s foo_t;" % cdefed)
            if cdefed == real:
                ffi.verify("typedef %s foo_t;" % real)
            else:
                py.test.raises(VerificationError, ffi.verify,
                               "typedef %s foo_t;" % real)

def test_nondecl_struct():
    ffi = FFI()
    ffi.cdef("typedef struct foo_s foo_t; int bar(foo_t *);")
    lib = ffi.verify("typedef struct foo_s foo_t;\n"
                     "int bar(foo_t *f) { return 42; }\n")
    assert lib.bar(ffi.NULL) == 42

def test_ffi_full_struct():
    ffi = FFI()
    ffi.cdef("struct foo_s { char x; int y; long *z; };")
    ffi.verify("struct foo_s { char x; int y; long *z; };")
    #
    if sys.platform == 'win32':
        py.test.skip("XXX fixme: only gives warnings")
    for real in [
        "struct foo_s { char x; int y; int *z; };",
        "struct foo_s { char x; long *z; int y; };",
        "struct foo_s { int y; long *z; };",
        "struct foo_s { char x; int y; long *z; char extra; };",
        ]:
        py.test.raises(VerificationError, ffi.verify, real)
    #
    # a corner case that we cannot really detect, but where it has no
    # bad consequences: the size is the same, but there is an extra field
    # that replaces what is just padding in our declaration above
    ffi.verify("struct foo_s { char x, extra; int y; long *z; };")


def test_ffi_nonfull_struct():
    ffi = FFI()
    ffi.cdef("""
    struct foo_s {
       int x;
       ...;
    };
    """)
    py.test.raises(VerificationMissing, ffi.sizeof, 'struct foo_s')
    py.test.raises(VerificationMissing, ffi.offsetof, 'struct foo_s', 'x')
    py.test.raises(VerificationMissing, ffi.new, 'struct foo_s *')
    ffi.verify("""
    struct foo_s {
       int a, b, x, c, d, e;
    };
    """)
    assert ffi.sizeof('struct foo_s') == 6 * ffi.sizeof('int')
    assert ffi.offsetof('struct foo_s', 'x') == 2 * ffi.sizeof('int')

def test_ffi_nonfull_alignment():
    ffi = FFI()
    ffi.cdef("struct foo_s { char x; ...; };")
    ffi.verify("struct foo_s { int a, b; char x; };")
    assert ffi.sizeof('struct foo_s') == 3 * ffi.sizeof('int')
    assert ffi.alignof('struct foo_s') == ffi.sizeof('int')

def _check_field_match(typename, real, expect_mismatch):
    ffi = FFI()
    if expect_mismatch == 'by_size':
        expect_mismatch = ffi.sizeof(typename) != ffi.sizeof(real)
    ffi.cdef("struct foo_s { %s x; ...; };" % typename)
    try:
        ffi.verify("struct foo_s { %s x; };" % real)
    except VerificationError:
        if not expect_mismatch:
            raise AssertionError("unexpected mismatch: %s should be accepted "
                                 "as equal to %s" % (typename, real))
    else:
        if expect_mismatch:
            raise AssertionError("mismatch not detected: "
                                 "%s != %s" % (typename, real))

def test_struct_bad_sized_integer():
    for typename in all_signed_integer_types:
        for real in all_signed_integer_types:
            _check_field_match(typename, real, "by_size")

def test_struct_bad_sized_float():
    for typename in all_float_types:
        for real in all_float_types:
            _check_field_match(typename, real, "by_size")

def test_struct_signedness_ignored():
    _check_field_match("int", "unsigned int", expect_mismatch=False)
    _check_field_match("unsigned short", "signed short", expect_mismatch=False)

def test_struct_float_vs_int():
    if sys.platform == 'win32':
        py.test.skip("XXX fixme: only gives warnings")
    for typename in all_signed_integer_types:
        for real in all_float_types:
            _check_field_match(typename, real, expect_mismatch=True)
    for typename in all_float_types:
        for real in all_signed_integer_types:
            _check_field_match(typename, real, expect_mismatch=True)

def test_struct_array_field():
    ffi = FFI()
    ffi.cdef("struct foo_s { int a[17]; ...; };")
    ffi.verify("struct foo_s { int x; int a[17]; int y; };")
    assert ffi.sizeof('struct foo_s') == 19 * ffi.sizeof('int')
    s = ffi.new("struct foo_s *")
    assert ffi.sizeof(s.a) == 17 * ffi.sizeof('int')

def test_struct_array_guess_length():
    ffi = FFI()
    ffi.cdef("struct foo_s { int a[]; ...; };")    # <= no declared length
    ffi.verify("struct foo_s { int x; int a[17]; int y; };")
    assert ffi.sizeof('struct foo_s') == 19 * ffi.sizeof('int')
    s = ffi.new("struct foo_s *")
    assert ffi.sizeof(s.a) == 17 * ffi.sizeof('int')

def test_struct_array_guess_length_2():
    ffi = FFI()
    ffi.cdef("struct foo_s { int a[]; ...; };\n"    # <= no declared length
             "int bar(struct foo_s *);\n")
    lib = ffi.verify("struct foo_s { int x; int a[17]; int y; };\n"
                     "int bar(struct foo_s *f) { return f->a[14]; }\n")
    assert ffi.sizeof('struct foo_s') == 19 * ffi.sizeof('int')
    s = ffi.new("struct foo_s *")
    s.a[14] = 4242
    assert lib.bar(s) == 4242

def test_struct_array_guess_length_3():
    ffi = FFI()
    ffi.cdef("struct foo_s { int a[...]; };")
    ffi.verify("struct foo_s { int x; int a[17]; int y; };")
    assert ffi.sizeof('struct foo_s') == 19 * ffi.sizeof('int')
    s = ffi.new("struct foo_s *")
    assert ffi.sizeof(s.a) == 17 * ffi.sizeof('int')

def test_global_constants():
    ffi = FFI()
    # use 'static const int', as generally documented, although in this
    # case the 'static' is completely ignored.
    ffi.cdef("static const int AA, BB, CC, DD;")
    lib = ffi.verify("#define AA 42\n"
                     "#define BB (-43)\n"
                     "#define CC (22*2)\n"
                     "#define DD ((unsigned int)142)\n")
    assert lib.AA == 42
    assert lib.BB == -43
    assert lib.CC == 44
    assert lib.DD == 142

def test_global_const_int_size():
    # integer constants: ignore the declared type, always just use the value
    for value in [-2**63, -2**31, -2**15,
                  2**15-1, 2**15, 2**31-1, 2**31, 2**32-1, 2**32,
                  2**63-1, 2**63, 2**64-1]:
        ffi = FFI()
        if value == int(ffi.cast("long long", value)):
            if value < 0:
                vstr = '(-%dLL-1)' % (~value,)
            else:
                vstr = '%dLL' % value
        elif value == int(ffi.cast("unsigned long long", value)):
            vstr = '%dULL' % value
        else:
            raise AssertionError(value)
        ffi.cdef("static const unsigned short AA;")
        lib = ffi.verify("#define AA %s\n" % vstr)
        assert lib.AA == value
        assert type(lib.AA) is type(int(lib.AA))

def test_global_constants_non_int():
    ffi = FFI()
    ffi.cdef("static char *const PP;")
    lib = ffi.verify('static char *const PP = "testing!";\n')
    assert ffi.typeof(lib.PP) == ffi.typeof("char *")
    assert lib.PP.value == b"testing!"

def test_nonfull_enum():
    ffi = FFI()
    ffi.cdef("enum ee { EE1, EE2, EE3, ... \n \t };")
    py.test.raises(VerificationMissing, ffi.cast, 'enum ee', 'EE2')
    ffi.verify("enum ee { EE1=10, EE2, EE3=-10, EE4 };")
    assert int(ffi.cast('enum ee', 'EE2')) == 11
    assert int(ffi.cast('enum ee', 'EE3')) == -10
    py.test.raises(ValueError, ffi.cast, 'enum ee', '__dotdotdot0__')

def test_full_enum():
    ffi = FFI()
    ffi.cdef("enum ee { EE1, EE2, EE3 };")
    ffi.verify("enum ee { EE1, EE2, EE3 };")
    py.test.raises(VerificationError, ffi.verify, "enum ee { EE1, EE2 };")
    e = py.test.raises(VerificationError, ffi.verify,
                       "enum ee { EE1, EE3, EE2 };")
    assert str(e.value) == 'in enum ee: EE2 has the real value 2, not 1'
    # extra items cannot be seen and have no bad consequence anyway
    lib = ffi.verify("enum ee { EE1, EE2, EE3, EE4 };")
    assert lib.EE3 == 2

def test_get_set_errno():
    ffi = FFI()
    ffi.cdef("int foo(int);")
    lib = ffi.verify("""
        static int foo(int x)
        {
            errno += 1;
            return x * 7;
        }
    """)
    ffi.errno = 15
    assert lib.foo(6) == 42
    assert ffi.errno == 16

def test_define_int():
    ffi = FFI()
    ffi.cdef("#define FOO ...\n"
             "\t#\tdefine\tBAR\t...\t")
    lib = ffi.verify("#define FOO 42\n"
                     "#define BAR (-44)\n")
    assert lib.FOO == 42
    assert lib.BAR == -44

def test_access_variable():
    ffi = FFI()
    ffi.cdef("int foo(void);\n"
             "int somenumber;")
    lib = ffi.verify("""
        static int somenumber = 2;
        static int foo(void) {
            return somenumber * 7;
        }
    """)
    assert lib.somenumber == 2
    assert lib.foo() == 14
    lib.somenumber = -6
    assert lib.foo() == -42
    assert lib.somenumber == -6
    lib.somenumber = 2   # reset for the next run, if any

def test_access_address_of_variable():
    # access the address of 'somenumber': need a trick
    ffi = FFI()
    ffi.cdef("int somenumber; static int *const somenumberptr;")
    lib = ffi.verify("""
        static int somenumber = 2;
        #define somenumberptr (&somenumber)
    """)
    assert lib.somenumber == 2
    lib.somenumberptr[0] = 42
    assert lib.somenumber == 42
    lib.somenumber = 2    # reset for the next run, if any

def test_access_array_variable():
    ffi = FFI()
    ffi.cdef("int foo(int);\n"
             "int somenumber[5];")
    lib = ffi.verify("""
        static int somenumber[] = {2, 2, 3, 4, 5};
        static int foo(int i) {
            return somenumber[i] * 7;
        }
    """)
    assert lib.somenumber[3] == 4
    assert lib.foo(3) == 28
    lib.somenumber[3] = -6
    assert lib.foo(3) == -42
    assert lib.somenumber[3] == -6
    assert lib.somenumber[4] == 5
    lib.somenumber[3] = 4    # reset for the next run, if any

def test_access_struct_variable():
    ffi = FFI()
    ffi.cdef("struct foo { int x; ...; };\n"
             "int foo(int);\n"
             "struct foo stuff;")
    lib = ffi.verify("""
        struct foo { int x, y, z; };
        static struct foo stuff = {2, 5, 8};
        static int foo(int i) {
            switch (i) {
            case 0: return stuff.x * 7;
            case 1: return stuff.y * 7;
            case 2: return stuff.z * 7;
            }
            return -1;
        }
    """)
    assert lib.stuff.x == 2
    assert lib.foo(0) == 14
    assert lib.foo(1) == 35
    assert lib.foo(2) == 56
    lib.stuff.x = -6
    assert lib.foo(0) == -42
    assert lib.foo(1) == 35
    lib.stuff.x = 2      # reset for the next run, if any

def test_access_callback():
    ffi = FFI()
    ffi.cdef("int (*cb)(int);\n"
             "int foo(int);\n"
             "void reset_cb(void);")
    lib = ffi.verify("""
        static int g(int x) { return x * 7; }
        static int (*cb)(int);
        static int foo(int i) { return cb(i) - 1; }
        static void reset_cb(void) { cb = g; }
    """)
    lib.reset_cb()
    assert lib.foo(6) == 41
    my_callback = ffi.callback("int(*)(int)", lambda n: n * 222)
    lib.cb = my_callback
    assert lib.foo(4) == 887

def test_cannot_verify_with_ctypes():
    from cffi.backend_ctypes import CTypesBackend
    ffi = FFI(backend=CTypesBackend())
    ffi.cdef("int a;")
    py.test.raises(NotImplementedError, ffi.verify, "int a;")

def test_call_with_struct_ptr():
    ffi = FFI()
    ffi.cdef("typedef struct { int x; ...; } foo_t; int foo(foo_t *);")
    lib = ffi.verify("""
        typedef struct { int y, x; } foo_t;
        static int foo(foo_t *f) { return f->x * 7; }
    """)
    f = ffi.new("foo_t *")
    f.x = 6
    assert lib.foo(f) == 42

def test_unknown_type():
    ffi = FFI()
    ffi.cdef("""
        typedef ... token_t;
        int foo(token_t *);
        #define TOKEN_SIZE ...
    """)
    lib = ffi.verify("""
        typedef float token_t;
        static int foo(token_t *tk) {
            if (!tk)
                return -42;
            *tk += 1.601;
            return (int)*tk;
        }
        #define TOKEN_SIZE sizeof(token_t)
    """)
    # we cannot let ffi.new("token_t *") work, because we don't know ahead of
    # time if it's ok to ask 'sizeof(token_t)' in the C code or not.
    # See test_unknown_type_2.  Workaround.
    tkmem = ffi.new("char[]", lib.TOKEN_SIZE)    # zero-initialized
    tk = ffi.cast("token_t *", tkmem)
    results = [lib.foo(tk) for i in range(6)]
    assert results == [1, 3, 4, 6, 8, 9]
    assert lib.foo(ffi.NULL) == -42

def test_unknown_type_2():
    ffi = FFI()
    ffi.cdef("typedef ... token_t;")
    lib = ffi.verify("typedef struct token_s token_t;")
    # assert did not crash, even though 'sizeof(token_t)' is not valid in C.

def test_varargs():
    ffi = FFI()
    ffi.cdef("int foo(int x, ...);")
    lib = ffi.verify("""
        int foo(int x, ...) {
            va_list vargs;
            va_start(vargs, x);
            x -= va_arg(vargs, int);
            x -= va_arg(vargs, int);
            va_end(vargs);
            return x;
        }
    """)
    assert lib.foo(50, ffi.cast("int", 5), ffi.cast("int", 3)) == 42

def test_varargs_exact():
    if sys.platform == 'win32':
        py.test.skip("XXX fixme: only gives warnings")
    ffi = FFI()
    ffi.cdef("int foo(int x, ...);")
    py.test.raises(VerificationError, ffi.verify, """
        int foo(long long x, ...) {
            return x;
        }
    """)

def test_varargs_struct():
    ffi = FFI()
    ffi.cdef("struct foo_s { char a; int b; }; int foo(int x, ...);")
    lib = ffi.verify("""
        struct foo_s {
            char a; int b;
        };
        int foo(int x, ...) {
            va_list vargs;
            struct foo_s s;
            va_start(vargs, x);
            s = va_arg(vargs, struct foo_s);
            va_end(vargs);
            return s.a - s.b;
        }
    """)
    s = ffi.new("struct foo_s *", [b'B', 1])
    assert lib.foo(50, s[0]) == ord('A')

def test_autofilled_struct_as_argument():
    ffi = FFI()
    ffi.cdef("struct foo_s { long a; double b; ...; };\n"
             "int foo(struct foo_s);")
    lib = ffi.verify("""
        struct foo_s {
            double b;
            long a;
        };
        int foo(struct foo_s s) {
            return s.a - (int)s.b;
        }
    """)
    s = ffi.new("struct foo_s *", [100, 1])
    assert lib.foo(s[0]) == 99
    assert lib.foo([100, 1]) == 99

def test_autofilled_struct_as_argument_dynamic():
    ffi = FFI()
    ffi.cdef("struct foo_s { long a; ...; };\n"
             "int (*foo)(struct foo_s);")
    e = py.test.raises(TypeError, ffi.verify, """
        struct foo_s {
            double b;
            long a;
        };
        int foo1(struct foo_s s) {
            return s.a - (int)s.b;
        }
        int (*foo)(struct foo_s s) = &foo1;
    """)
    msg ='cannot pass as an argument a struct that was completed with verify()'
    assert msg in str(e.value)

def test_func_returns_struct():
    ffi = FFI()
    ffi.cdef("""
        struct foo_s { int aa, bb; };
        struct foo_s foo(int a, int b);
    """)
    lib = ffi.verify("""
        struct foo_s { int aa, bb; };
        struct foo_s foo(int a, int b) {
            struct foo_s r;
            r.aa = a*a;
            r.bb = b*b;
            return r;
        }
    """)
    s = lib.foo(6, 7)
    assert repr(s) == "<cdata 'struct foo_s' owning 8 bytes>"
    assert s.aa == 36
    assert s.bb == 49

def test_func_as_funcptr():
    ffi = FFI()
    ffi.cdef("int *(*const fooptr)(void);")
    lib = ffi.verify("""
        int *foo(void) {
            return (int*)"foobar";
        }
        int *(*fooptr)(void) = foo;
    """)
    foochar = ffi.cast("char *(*)(void)", lib.fooptr)
    s = foochar()
    assert s.value == b"foobar"

def test_funcptr_as_argument():
    ffi = FFI()
    ffi.cdef("""
        void qsort(void *base, size_t nel, size_t width,
            int (*compar)(const void *, const void *));
    """)
    ffi.verify("#include <stdlib.h>")

def test_func_as_argument():
    ffi = FFI()
    ffi.cdef("""
        void qsort(void *base, size_t nel, size_t width,
            int compar(const void *, const void *));
    """)
    ffi.verify("#include <stdlib.h>")

def test_array_as_argument():
    ffi = FFI()
    ffi.cdef("""
        int strlen(char string[]);
    """)
    ffi.verify("#include <string.h>")

def test_enum_as_argument():
    ffi = FFI()
    ffi.cdef("""
        enum foo_e { AA, BB, ... };
        int foo_func(enum foo_e);
    """)
    lib = ffi.verify("""
        enum foo_e { AA, CC, BB };
        int foo_func(enum foo_e e) { return e; }
    """)
    assert lib.foo_func(lib.BB) == 2
    assert lib.foo_func("BB") == 2

def test_enum_as_function_result():
    ffi = FFI()
    ffi.cdef("""
        enum foo_e { AA, BB, ... };
        enum foo_e foo_func(int x);
    """)
    lib = ffi.verify("""
        enum foo_e { AA, CC, BB };
        enum foo_e foo_func(int x) { return x; }
    """)
    assert lib.foo_func(lib.BB) == "BB"

def test_callback_calling_convention():
    py.test.skip("later")
    if sys.platform != 'win32':
        py.test.skip("Windows only")
    ffi = FFI()
    ffi.cdef("""
        int call1(int(*__cdecl cb)(int));
        int call2(int(*__stdcall cb)(int));
    """)
    lib = ffi.verify("""
        int call1(int(*__cdecl cb)(int)) {
            return cb(42) + 1;
        }
        int call2(int(*__stdcall cb)(int)) {
            return cb(-42) - 6;
        }
    """)
    xxx

def test_opaque_integer_as_function_result():
    # XXX bad abuse of "struct { ...; }".  It only works a bit by chance
    # anyway.  XXX think about something better :-(
    ffi = FFI()
    ffi.cdef("""
        typedef struct { ...; } handle_t;
        handle_t foo(void);
    """)
    lib = ffi.verify("""
        typedef short handle_t;
        handle_t foo(void) { return 42; }
    """)
    h = lib.foo()
    assert ffi.sizeof(h) == ffi.sizeof("short")
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for ProjectModifiedEvent.java.
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.