forked from postgres/postgres
-
Notifications
You must be signed in to change notification settings - Fork 6
/
Copy pathc.h
1239 lines (1086 loc) · 38 KB
/
c.h
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
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*-------------------------------------------------------------------------
*
* c.h
* Fundamental C definitions. This is included by every .c file in
* PostgreSQL (via either postgres.h or postgres_fe.h, as appropriate).
*
* Note that the definitions here are not intended to be exposed to clients
* of the frontend interface libraries --- so we don't worry much about
* polluting the namespace with lots of stuff...
*
*
* Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/c.h
*
*-------------------------------------------------------------------------
*/
/*
*----------------------------------------------------------------
* TABLE OF CONTENTS
*
* When adding stuff to this file, please try to put stuff
* into the relevant section, or add new sections as appropriate.
*
* section description
* ------- ------------------------------------------------
* 0) pg_config.h and standard system headers
* 1) compiler characteristics
* 2) bool, true, false
* 3) standard system types
* 4) IsValid macros for system types
* 5) offsetof, lengthof, alignment
* 6) assertions
* 7) widely useful macros
* 8) random stuff
* 9) system-specific hacks
*
* NOTE: since this file is included by both frontend and backend modules,
* it's usually wrong to put an "extern" declaration here, unless it's
* ifdef'd so that it's seen in only one case or the other.
* typedefs and macros are the kind of thing that might go here.
*
*----------------------------------------------------------------
*/
#ifndef C_H
#define C_H
#include "postgres_ext.h"
/* Must undef pg_config_ext.h symbols before including pg_config.h */
#undef PG_INT64_TYPE
#include "pg_config.h"
#include "pg_config_manual.h" /* must be after pg_config.h */
#include "pg_config_os.h" /* must be before any system header files */
/* System header files that should be available everywhere in Postgres */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stddef.h>
#include <stdarg.h>
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#include <sys/types.h>
#include <errno.h>
#if defined(WIN32) || defined(__CYGWIN__)
#include <fcntl.h> /* ensure O_BINARY is available */
#endif
#include <locale.h>
#ifdef ENABLE_NLS
#include <libintl.h>
#endif
/* ----------------------------------------------------------------
* Section 1: compiler characteristics
*
* type prefixes (const, signed, volatile, inline) are handled in pg_config.h.
* ----------------------------------------------------------------
*/
/*
* Disable "inline" if PG_FORCE_DISABLE_INLINE is defined.
* This is used to work around compiler bugs and might also be useful for
* investigatory purposes.
*/
#ifdef PG_FORCE_DISABLE_INLINE
#undef inline
#define inline
#endif
/*
* Attribute macros
*
* GCC: https://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
* GCC: https://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html
* Sunpro: https://docs.oracle.com/cd/E18659_01/html/821-1384/gjzke.html
* XLC: http://www-01.ibm.com/support/knowledgecenter/SSGH2K_11.1.0/com.ibm.xlc111.aix.doc/language_ref/function_attributes.html
* XLC: http://www-01.ibm.com/support/knowledgecenter/SSGH2K_11.1.0/com.ibm.xlc111.aix.doc/language_ref/type_attrib.html
*/
/* only GCC supports the unused attribute */
#ifdef __GNUC__
#define pg_attribute_unused() __attribute__((unused))
#else
#define pg_attribute_unused()
#endif
/*
* Append PG_USED_FOR_ASSERTS_ONLY to definitions of variables that are only
* used in assert-enabled builds, to avoid compiler warnings about unused
* variables in assert-disabled builds.
*/
#ifdef USE_ASSERT_CHECKING
#define PG_USED_FOR_ASSERTS_ONLY
#else
#define PG_USED_FOR_ASSERTS_ONLY pg_attribute_unused()
#endif
/* GCC and XLC support format attributes */
#if defined(__GNUC__) || defined(__IBMC__)
#define pg_attribute_format_arg(a) __attribute__((format_arg(a)))
#define pg_attribute_printf(f,a) __attribute__((format(PG_PRINTF_ATTRIBUTE, f, a)))
#else
#define pg_attribute_format_arg(a)
#define pg_attribute_printf(f,a)
#endif
/* GCC, Sunpro and XLC support aligned, packed and noreturn */
#if defined(__GNUC__) || defined(__SUNPRO_C) || defined(__IBMC__)
#define pg_attribute_aligned(a) __attribute__((aligned(a)))
#define pg_attribute_noreturn() __attribute__((noreturn))
#define pg_attribute_packed() __attribute__((packed))
#define HAVE_PG_ATTRIBUTE_NORETURN 1
#else
/*
* NB: aligned and packed are not given default definitions because they
* affect code functionality; they *must* be implemented by the compiler
* if they are to be used.
*/
#define pg_attribute_noreturn()
#endif
/*
* Use "pg_attribute_always_inline" in place of "inline" for functions that
* we wish to force inlining of, even when the compiler's heuristics would
* choose not to. But, if possible, don't force inlining in unoptimized
* debug builds.
*/
#if (defined(__GNUC__) && __GNUC__ > 3 && defined(__OPTIMIZE__)) || defined(__SUNPRO_C) || defined(__IBMC__)
/* GCC > 3, Sunpro and XLC support always_inline via __attribute__ */
#define pg_attribute_always_inline __attribute__((always_inline)) inline
#elif defined(_MSC_VER)
/* MSVC has a special keyword for this */
#define pg_attribute_always_inline __forceinline
#else
/* Otherwise, the best we can do is to say "inline" */
#define pg_attribute_always_inline inline
#endif
/*
* Forcing a function not to be inlined can be useful if it's the slow path of
* a performance-critical function, or should be visible in profiles to allow
* for proper cost attribution. Note that unlike the pg_attribute_XXX macros
* above, this should be placed before the function's return type and name.
*/
/* GCC, Sunpro and XLC support noinline via __attribute__ */
#if (defined(__GNUC__) && __GNUC__ > 2) || defined(__SUNPRO_C) || defined(__IBMC__)
#define pg_noinline __attribute__((noinline))
/* msvc via declspec */
#elif defined(_MSC_VER)
#define pg_noinline __declspec(noinline)
#else
#define pg_noinline
#endif
/*
* Mark a point as unreachable in a portable fashion. This should preferably
* be something that the compiler understands, to aid code generation.
* In assert-enabled builds, we prefer abort() for debugging reasons.
*/
#if defined(HAVE__BUILTIN_UNREACHABLE) && !defined(USE_ASSERT_CHECKING)
#define pg_unreachable() __builtin_unreachable()
#elif defined(_MSC_VER) && !defined(USE_ASSERT_CHECKING)
#define pg_unreachable() __assume(0)
#else
#define pg_unreachable() abort()
#endif
/*
* Hints to the compiler about the likelihood of a branch. Both likely() and
* unlikely() return the boolean value of the contained expression.
*
* These should only be used sparingly, in very hot code paths. It's very easy
* to mis-estimate likelihoods.
*/
#if __GNUC__ >= 3
#define likely(x) __builtin_expect((x) != 0, 1)
#define unlikely(x) __builtin_expect((x) != 0, 0)
#else
#define likely(x) ((x) != 0)
#define unlikely(x) ((x) != 0)
#endif
/*
* CppAsString
* Convert the argument to a string, using the C preprocessor.
* CppAsString2
* Convert the argument to a string, after one round of macro expansion.
* CppConcat
* Concatenate two arguments together, using the C preprocessor.
*
* Note: There used to be support here for pre-ANSI C compilers that didn't
* support # and ##. Nowadays, these macros are just for clarity and/or
* backward compatibility with existing PostgreSQL code.
*/
#define CppAsString(identifier) #identifier
#define CppAsString2(x) CppAsString(x)
#define CppConcat(x, y) x##y
/*
* VA_ARGS_NARGS
* Returns the number of macro arguments it is passed.
*
* An empty argument still counts as an argument, so effectively, this is
* "one more than the number of commas in the argument list".
*
* This works for up to 63 arguments. Internally, VA_ARGS_NARGS_() is passed
* 64+N arguments, and the C99 standard only requires macros to allow up to
* 127 arguments, so we can't portably go higher. The implementation is
* pretty trivial: VA_ARGS_NARGS_() returns its 64th argument, and we set up
* the call so that that is the appropriate one of the list of constants.
* This idea is due to Laurent Deniau.
*/
#define VA_ARGS_NARGS(...) \
VA_ARGS_NARGS_(__VA_ARGS__, \
63,62,61,60, \
59,58,57,56,55,54,53,52,51,50, \
49,48,47,46,45,44,43,42,41,40, \
39,38,37,36,35,34,33,32,31,30, \
29,28,27,26,25,24,23,22,21,20, \
19,18,17,16,15,14,13,12,11,10, \
9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
#define VA_ARGS_NARGS_( \
_01,_02,_03,_04,_05,_06,_07,_08,_09,_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, N, ...) \
(N)
/*
* dummyret is used to set return values in macros that use ?: to make
* assignments. gcc wants these to be void, other compilers like char
*/
#ifdef __GNUC__ /* GNU cc */
#define dummyret void
#else
#define dummyret char
#endif
/* Which __func__ symbol do we have, if any? */
#ifdef HAVE_FUNCNAME__FUNC
#define PG_FUNCNAME_MACRO __func__
#else
#ifdef HAVE_FUNCNAME__FUNCTION
#define PG_FUNCNAME_MACRO __FUNCTION__
#else
#define PG_FUNCNAME_MACRO NULL
#endif
#endif
/* ----------------------------------------------------------------
* Section 2: bool, true, false
* ----------------------------------------------------------------
*/
/*
* bool
* Boolean value, either true or false.
*
* Use stdbool.h if available and its bool has size 1. That's useful for
* better compiler and debugger output and for compatibility with third-party
* libraries. But PostgreSQL currently cannot deal with bool of other sizes;
* there are static assertions around the code to prevent that.
*
* For C++ compilers, we assume the compiler has a compatible built-in
* definition of bool.
*/
#ifndef __cplusplus
#if defined(HAVE_STDBOOL_H) && SIZEOF_BOOL == 1
#include <stdbool.h>
#define USE_STDBOOL 1
#else
#ifndef bool
typedef char bool;
#endif
#ifndef true
#define true ((bool) 1)
#endif
#ifndef false
#define false ((bool) 0)
#endif
#endif
#endif /* not C++ */
/* ----------------------------------------------------------------
* Section 3: standard system types
* ----------------------------------------------------------------
*/
/*
* Pointer
* Variable holding address of any memory resident object.
*
* XXX Pointer arithmetic is done with this, so it can't be void *
* under "true" ANSI compilers.
*/
typedef char *Pointer;
/*
* intN
* Signed integer, EXACTLY N BITS IN SIZE,
* used for numerical computations and the
* frontend/backend protocol.
*/
#ifndef HAVE_INT8
typedef signed char int8; /* == 8 bits */
typedef signed short int16; /* == 16 bits */
typedef signed int int32; /* == 32 bits */
#endif /* not HAVE_INT8 */
/*
* uintN
* Unsigned integer, EXACTLY N BITS IN SIZE,
* used for numerical computations and the
* frontend/backend protocol.
*/
#ifndef HAVE_UINT8
typedef unsigned char uint8; /* == 8 bits */
typedef unsigned short uint16; /* == 16 bits */
typedef unsigned int uint32; /* == 32 bits */
#endif /* not HAVE_UINT8 */
/*
* bitsN
* Unit of bitwise operation, AT LEAST N BITS IN SIZE.
*/
typedef uint8 bits8; /* >= 8 bits */
typedef uint16 bits16; /* >= 16 bits */
typedef uint32 bits32; /* >= 32 bits */
/*
* 64-bit integers
*/
#ifdef HAVE_LONG_INT_64
/* Plain "long int" fits, use it */
#ifndef HAVE_INT64
typedef long int int64;
#endif
#ifndef HAVE_UINT64
typedef unsigned long int uint64;
#endif
#define INT64CONST(x) (x##L)
#define UINT64CONST(x) (x##UL)
#elif defined(HAVE_LONG_LONG_INT_64)
/* We have working support for "long long int", use that */
#ifndef HAVE_INT64
typedef long long int int64;
#endif
#ifndef HAVE_UINT64
typedef unsigned long long int uint64;
#endif
#define INT64CONST(x) (x##LL)
#define UINT64CONST(x) (x##ULL)
#else
/* neither HAVE_LONG_INT_64 nor HAVE_LONG_LONG_INT_64 */
#error must have a working 64-bit integer datatype
#endif
/* snprintf format strings to use for 64-bit integers */
#define INT64_FORMAT "%" INT64_MODIFIER "d"
#define UINT64_FORMAT "%" INT64_MODIFIER "u"
/*
* 128-bit signed and unsigned integers
* There currently is only limited support for such types.
* E.g. 128bit literals and snprintf are not supported; but math is.
* Also, because we exclude such types when choosing MAXIMUM_ALIGNOF,
* it must be possible to coerce the compiler to allocate them on no
* more than MAXALIGN boundaries.
*/
#if defined(PG_INT128_TYPE)
#if defined(pg_attribute_aligned) || ALIGNOF_PG_INT128_TYPE <= MAXIMUM_ALIGNOF
#define HAVE_INT128 1
typedef PG_INT128_TYPE int128
#if defined(pg_attribute_aligned)
pg_attribute_aligned(MAXIMUM_ALIGNOF)
#endif
;
typedef unsigned PG_INT128_TYPE uint128
#if defined(pg_attribute_aligned)
pg_attribute_aligned(MAXIMUM_ALIGNOF)
#endif
;
#endif
#endif
/*
* stdint.h limits aren't guaranteed to be present and aren't guaranteed to
* have compatible types with our fixed width types. So just define our own.
*/
#define PG_INT8_MIN (-0x7F-1)
#define PG_INT8_MAX (0x7F)
#define PG_UINT8_MAX (0xFF)
#define PG_INT16_MIN (-0x7FFF-1)
#define PG_INT16_MAX (0x7FFF)
#define PG_UINT16_MAX (0xFFFF)
#define PG_INT32_MIN (-0x7FFFFFFF-1)
#define PG_INT32_MAX (0x7FFFFFFF)
#define PG_UINT32_MAX (0xFFFFFFFFU)
#define PG_INT64_MIN (-INT64CONST(0x7FFFFFFFFFFFFFFF) - 1)
#define PG_INT64_MAX INT64CONST(0x7FFFFFFFFFFFFFFF)
#define PG_UINT64_MAX UINT64CONST(0xFFFFFFFFFFFFFFFF)
/* Max value of size_t might also be missing if we don't have stdint.h */
#ifndef SIZE_MAX
#if SIZEOF_SIZE_T == 8
#define SIZE_MAX PG_UINT64_MAX
#else
#define SIZE_MAX PG_UINT32_MAX
#endif
#endif
/*
* We now always use int64 timestamps, but keep this symbol defined for the
* benefit of external code that might test it.
*/
#define HAVE_INT64_TIMESTAMP
/*
* Size
* Size of any memory resident object, as returned by sizeof.
*/
typedef size_t Size;
/*
* Index
* Index into any memory resident array.
*
* Note:
* Indices are non negative.
*/
typedef unsigned int Index;
/*
* Offset
* Offset into any memory resident array.
*
* Note:
* This differs from an Index in that an Index is always
* non negative, whereas Offset may be negative.
*/
typedef signed int Offset;
/*
* Common Postgres datatype names (as used in the catalogs)
*/
typedef float float4;
typedef double float8;
/*
* Oid, RegProcedure, TransactionId, SubTransactionId, MultiXactId,
* CommandId
*/
/* typedef Oid is in postgres_ext.h */
/*
* regproc is the type name used in the include/catalog headers, but
* RegProcedure is the preferred name in C code.
*/
typedef Oid regproc;
typedef regproc RegProcedure;
typedef uint32 TransactionId;
typedef uint32 LocalTransactionId;
typedef uint32 SubTransactionId;
#define InvalidSubTransactionId ((SubTransactionId) 0)
#define TopSubTransactionId ((SubTransactionId) 1)
/* MultiXactId must be equivalent to TransactionId, to fit in t_xmax */
typedef TransactionId MultiXactId;
typedef uint32 MultiXactOffset;
typedef uint32 CommandId;
#define FirstCommandId ((CommandId) 0)
#define InvalidCommandId (~(CommandId)0)
/*
* Array indexing support
*/
#define MAXDIM 6
typedef struct
{
int indx[MAXDIM];
} IntArray;
/* ----------------
* Variable-length datatypes all share the 'struct varlena' header.
*
* NOTE: for TOASTable types, this is an oversimplification, since the value
* may be compressed or moved out-of-line. However datatype-specific routines
* are mostly content to deal with de-TOASTed values only, and of course
* client-side routines should never see a TOASTed value. But even in a
* de-TOASTed value, beware of touching vl_len_ directly, as its
* representation is no longer convenient. It's recommended that code always
* use macros VARDATA_ANY, VARSIZE_ANY, VARSIZE_ANY_EXHDR, VARDATA, VARSIZE,
* and SET_VARSIZE instead of relying on direct mentions of the struct fields.
* See postgres.h for details of the TOASTed form.
* ----------------
*/
struct varlena
{
char vl_len_[4]; /* Do not touch this field directly! */
char vl_dat[FLEXIBLE_ARRAY_MEMBER]; /* Data content is here */
};
#define VARHDRSZ ((int32) sizeof(int32))
/*
* These widely-used datatypes are just a varlena header and the data bytes.
* There is no terminating null or anything like that --- the data length is
* always VARSIZE_ANY_EXHDR(ptr).
*/
typedef struct varlena bytea;
typedef struct varlena text;
typedef struct varlena BpChar; /* blank-padded char, ie SQL char(n) */
typedef struct varlena VarChar; /* var-length char, ie SQL varchar(n) */
/*
* Specialized array types. These are physically laid out just the same
* as regular arrays (so that the regular array subscripting code works
* with them). They exist as distinct types mostly for historical reasons:
* they have nonstandard I/O behavior which we don't want to change for fear
* of breaking applications that look at the system catalogs. There is also
* an implementation issue for oidvector: it's part of the primary key for
* pg_proc, and we can't use the normal btree array support routines for that
* without circularity.
*/
typedef struct
{
int32 vl_len_; /* these fields must match ArrayType! */
int ndim; /* always 1 for int2vector */
int32 dataoffset; /* always 0 for int2vector */
Oid elemtype;
int dim1;
int lbound1;
int16 values[FLEXIBLE_ARRAY_MEMBER];
} int2vector;
typedef struct
{
int32 vl_len_; /* these fields must match ArrayType! */
int ndim; /* always 1 for oidvector */
int32 dataoffset; /* always 0 for oidvector */
Oid elemtype;
int dim1;
int lbound1;
Oid values[FLEXIBLE_ARRAY_MEMBER];
} oidvector;
/*
* Representation of a Name: effectively just a C string, but null-padded to
* exactly NAMEDATALEN bytes. The use of a struct is historical.
*/
typedef struct nameData
{
char data[NAMEDATALEN];
} NameData;
typedef NameData *Name;
#define NameStr(name) ((name).data)
/* ----------------------------------------------------------------
* Section 4: IsValid macros for system types
* ----------------------------------------------------------------
*/
/*
* BoolIsValid
* True iff bool is valid.
*/
#define BoolIsValid(boolean) ((boolean) == false || (boolean) == true)
/*
* PointerIsValid
* True iff pointer is valid.
*/
#define PointerIsValid(pointer) ((const void*)(pointer) != NULL)
/*
* PointerIsAligned
* True iff pointer is properly aligned to point to the given type.
*/
#define PointerIsAligned(pointer, type) \
(((uintptr_t)(pointer) % (sizeof (type))) == 0)
#define OffsetToPointer(base, offset) \
((void *)((char *) base + offset))
#define OidIsValid(objectId) ((bool) ((objectId) != InvalidOid))
#define RegProcedureIsValid(p) OidIsValid(p)
/* ----------------------------------------------------------------
* Section 5: offsetof, lengthof, alignment
* ----------------------------------------------------------------
*/
/*
* offsetof
* Offset of a structure/union field within that structure/union.
*
* XXX This is supposed to be part of stddef.h, but isn't on
* some systems (like SunOS 4).
*/
#ifndef offsetof
#define offsetof(type, field) ((long) &((type *)0)->field)
#endif /* offsetof */
/*
* lengthof
* Number of elements in an array.
*/
#define lengthof(array) (sizeof (array) / sizeof ((array)[0]))
/* ----------------
* Alignment macros: align a length or address appropriately for a given type.
* The fooALIGN() macros round up to a multiple of the required alignment,
* while the fooALIGN_DOWN() macros round down. The latter are more useful
* for problems like "how many X-sized structures will fit in a page?".
*
* NOTE: TYPEALIGN[_DOWN] will not work if ALIGNVAL is not a power of 2.
* That case seems extremely unlikely to be needed in practice, however.
*
* NOTE: MAXIMUM_ALIGNOF, and hence MAXALIGN(), intentionally exclude any
* larger-than-8-byte types the compiler might have.
* ----------------
*/
#define TYPEALIGN(ALIGNVAL,LEN) \
(((uintptr_t) (LEN) + ((ALIGNVAL) - 1)) & ~((uintptr_t) ((ALIGNVAL) - 1)))
#define SHORTALIGN(LEN) TYPEALIGN(ALIGNOF_SHORT, (LEN))
#define INTALIGN(LEN) TYPEALIGN(ALIGNOF_INT, (LEN))
#define LONGALIGN(LEN) TYPEALIGN(ALIGNOF_LONG, (LEN))
#define DOUBLEALIGN(LEN) TYPEALIGN(ALIGNOF_DOUBLE, (LEN))
#define MAXALIGN(LEN) TYPEALIGN(MAXIMUM_ALIGNOF, (LEN))
/* MAXALIGN covers only built-in types, not buffers */
#define BUFFERALIGN(LEN) TYPEALIGN(ALIGNOF_BUFFER, (LEN))
#define CACHELINEALIGN(LEN) TYPEALIGN(PG_CACHE_LINE_SIZE, (LEN))
#define TYPEALIGN_DOWN(ALIGNVAL,LEN) \
(((uintptr_t) (LEN)) & ~((uintptr_t) ((ALIGNVAL) - 1)))
#define SHORTALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_SHORT, (LEN))
#define INTALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_INT, (LEN))
#define LONGALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_LONG, (LEN))
#define DOUBLEALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_DOUBLE, (LEN))
#define MAXALIGN_DOWN(LEN) TYPEALIGN_DOWN(MAXIMUM_ALIGNOF, (LEN))
#define BUFFERALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_BUFFER, (LEN))
/*
* The above macros will not work with types wider than uintptr_t, like with
* uint64 on 32-bit platforms. That's not problem for the usual use where a
* pointer or a length is aligned, but for the odd case that you need to
* align something (potentially) wider, use TYPEALIGN64.
*/
#define TYPEALIGN64(ALIGNVAL,LEN) \
(((uint64) (LEN) + ((ALIGNVAL) - 1)) & ~((uint64) ((ALIGNVAL) - 1)))
/* we don't currently need wider versions of the other ALIGN macros */
#define MAXALIGN64(LEN) TYPEALIGN64(MAXIMUM_ALIGNOF, (LEN))
/* ----------------------------------------------------------------
* Section 6: assertions
* ----------------------------------------------------------------
*/
/*
* USE_ASSERT_CHECKING, if defined, turns on all the assertions.
* - plai 9/5/90
*
* It should _NOT_ be defined in releases or in benchmark copies
*/
/*
* Assert() can be used in both frontend and backend code. In frontend code it
* just calls the standard assert, if it's available. If use of assertions is
* not configured, it does nothing.
*/
#ifndef USE_ASSERT_CHECKING
#define Assert(condition) ((void)true)
#define AssertMacro(condition) ((void)true)
#define AssertArg(condition) ((void)true)
#define AssertState(condition) ((void)true)
#define AssertPointerAlignment(ptr, bndr) ((void)true)
#define Trap(condition, errorType) ((void)true)
#define TrapMacro(condition, errorType) (true)
#elif defined(FRONTEND)
#include <assert.h>
#define Assert(p) assert(p)
#define AssertMacro(p) ((void) assert(p))
#define AssertArg(condition) assert(condition)
#define AssertState(condition) assert(condition)
#define AssertPointerAlignment(ptr, bndr) ((void)true)
#else /* USE_ASSERT_CHECKING && !FRONTEND */
/*
* Trap
* Generates an exception if the given condition is true.
*/
#define Trap(condition, errorType) \
do { \
if (condition) \
ExceptionalCondition(CppAsString(condition), (errorType), \
__FILE__, __LINE__); \
} while (0)
/*
* TrapMacro is the same as Trap but it's intended for use in macros:
*
* #define foo(x) (AssertMacro(x != 0), bar(x))
*
* Isn't CPP fun?
*/
#define TrapMacro(condition, errorType) \
((bool) (! (condition) || \
(ExceptionalCondition(CppAsString(condition), (errorType), \
__FILE__, __LINE__), 0)))
#define Assert(condition) \
Trap(!(condition), "FailedAssertion")
#define AssertMacro(condition) \
((void) TrapMacro(!(condition), "FailedAssertion"))
#define AssertArg(condition) \
Trap(!(condition), "BadArgument")
#define AssertState(condition) \
Trap(!(condition), "BadState")
/*
* Check that `ptr' is `bndr' aligned.
*/
#define AssertPointerAlignment(ptr, bndr) \
Trap(TYPEALIGN(bndr, (uintptr_t)(ptr)) != (uintptr_t)(ptr), \
"UnalignedPointer")
#endif /* USE_ASSERT_CHECKING && !FRONTEND */
/*
* ExceptionalCondition is compiled into the backend whether or not
* USE_ASSERT_CHECKING is defined, so as to support use of extensions
* that are built with that #define with a backend that isn't. Hence,
* we should declare it as long as !FRONTEND.
*/
#ifndef FRONTEND
extern void ExceptionalCondition(const char *conditionName,
const char *errorType,
const char *fileName, int lineNumber) pg_attribute_noreturn();
#endif
/*
* Macros to support compile-time assertion checks.
*
* If the "condition" (a compile-time-constant expression) evaluates to false,
* throw a compile error using the "errmessage" (a string literal).
*
* gcc 4.6 and up supports _Static_assert(), but there are bizarre syntactic
* placement restrictions. These macros make it safe to use as a statement
* or in an expression, respectively.
*
* Otherwise we fall back on a kluge that assumes the compiler will complain
* about a negative width for a struct bit-field. This will not include a
* helpful error message, but it beats not getting an error at all.
*/
#ifndef __cplusplus
#ifdef HAVE__STATIC_ASSERT
#define StaticAssertStmt(condition, errmessage) \
do { _Static_assert(condition, errmessage); } while(0)
#define StaticAssertExpr(condition, errmessage) \
((void) ({ StaticAssertStmt(condition, errmessage); true; }))
#else /* !HAVE__STATIC_ASSERT */
#define StaticAssertStmt(condition, errmessage) \
((void) sizeof(struct { int static_assert_failure : (condition) ? 1 : -1; }))
#define StaticAssertExpr(condition, errmessage) \
StaticAssertStmt(condition, errmessage)
#endif /* HAVE__STATIC_ASSERT */
#else /* C++ */
#if defined(__cpp_static_assert) && __cpp_static_assert >= 200410
#define StaticAssertStmt(condition, errmessage) \
static_assert(condition, errmessage)
#define StaticAssertExpr(condition, errmessage) \
({ static_assert(condition, errmessage); })
#else
#define StaticAssertStmt(condition, errmessage) \
do { struct static_assert_struct { int static_assert_failure : (condition) ? 1 : -1; }; } while(0)
#define StaticAssertExpr(condition, errmessage) \
((void) ({ StaticAssertStmt(condition, errmessage); }))
#endif
#endif /* C++ */
/*
* Compile-time checks that a variable (or expression) has the specified type.
*
* AssertVariableIsOfType() can be used as a statement.
* AssertVariableIsOfTypeMacro() is intended for use in macros, eg
* #define foo(x) (AssertVariableIsOfTypeMacro(x, int), bar(x))
*
* If we don't have __builtin_types_compatible_p, we can still assert that
* the types have the same size. This is far from ideal (especially on 32-bit
* platforms) but it provides at least some coverage.
*/
#ifdef HAVE__BUILTIN_TYPES_COMPATIBLE_P
#define AssertVariableIsOfType(varname, typename) \
StaticAssertStmt(__builtin_types_compatible_p(__typeof__(varname), typename), \
CppAsString(varname) " does not have type " CppAsString(typename))
#define AssertVariableIsOfTypeMacro(varname, typename) \
(StaticAssertExpr(__builtin_types_compatible_p(__typeof__(varname), typename), \
CppAsString(varname) " does not have type " CppAsString(typename)))
#else /* !HAVE__BUILTIN_TYPES_COMPATIBLE_P */
#define AssertVariableIsOfType(varname, typename) \
StaticAssertStmt(sizeof(varname) == sizeof(typename), \
CppAsString(varname) " does not have type " CppAsString(typename))
#define AssertVariableIsOfTypeMacro(varname, typename) \
(StaticAssertExpr(sizeof(varname) == sizeof(typename), \
CppAsString(varname) " does not have type " CppAsString(typename)))
#endif /* HAVE__BUILTIN_TYPES_COMPATIBLE_P */
/* ----------------------------------------------------------------
* Section 7: widely useful macros
* ----------------------------------------------------------------
*/
/*
* Max
* Return the maximum of two numbers.
*/
#define Max(x, y) ((x) > (y) ? (x) : (y))
/*
* Min
* Return the minimum of two numbers.
*/
#define Min(x, y) ((x) < (y) ? (x) : (y))
/*
* Abs
* Return the absolute value of the argument.
*/
#define Abs(x) ((x) >= 0 ? (x) : -(x))
/*
* StrNCpy
* Like standard library function strncpy(), except that result string
* is guaranteed to be null-terminated --- that is, at most N-1 bytes
* of the source string will be kept.
* Also, the macro returns no result (too hard to do that without
* evaluating the arguments multiple times, which seems worse).
*
* BTW: when you need to copy a non-null-terminated string (like a text
* datum) and add a null, do not do it with StrNCpy(..., len+1). That
* might seem to work, but it fetches one byte more than there is in the
* text object. One fine day you'll have a SIGSEGV because there isn't
* another byte before the end of memory. Don't laugh, we've had real
* live bug reports from real live users over exactly this mistake.
* Do it honestly with "memcpy(dst,src,len); dst[len] = '\0';", instead.
*/
#define StrNCpy(dst,src,len) \
do \
{ \
char * _dst = (dst); \
Size _len = (len); \
\
if (_len > 0) \
{ \
strncpy(_dst, (src), _len); \
_dst[_len-1] = '\0'; \
} \
} while (0)
/* Get a bit mask of the bits set in non-long aligned addresses */
#define LONG_ALIGN_MASK (sizeof(long) - 1)
/*
* MemSet
* Exactly the same as standard library function memset(), but considerably
* faster for zeroing small word-aligned structures (such as parsetree nodes).
* This has to be a macro because the main point is to avoid function-call
* overhead. However, we have also found that the loop is faster than
* native libc memset() on some platforms, even those with assembler
* memset() functions. More research needs to be done, perhaps with
* MEMSET_LOOP_LIMIT tests in configure.
*/
#define MemSet(start, val, len) \
do \
{ \
/* must be void* because we don't know if it is integer aligned yet */ \
void *_vstart = (void *) (start); \
int _val = (val); \
Size _len = (len); \
\
if ((((uintptr_t) _vstart) & LONG_ALIGN_MASK) == 0 && \
(_len & LONG_ALIGN_MASK) == 0 && \
_val == 0 && \
_len <= MEMSET_LOOP_LIMIT && \
/* \
* If MEMSET_LOOP_LIMIT == 0, optimizer should find \
* the whole "if" false at compile time. \
*/ \
MEMSET_LOOP_LIMIT != 0) \
{ \
long *_start = (long *) _vstart; \
long *_stop = (long *) ((char *) _start + _len); \
while (_start < _stop) \
*_start++ = 0; \
} \
else \
memset(_vstart, _val, _len); \
} while (0)
/*
* MemSetAligned is the same as MemSet except it omits the test to see if
* "start" is word-aligned. This is okay to use if the caller knows a-priori
* that the pointer is suitably aligned (typically, because he just got it
* from palloc(), which always delivers a max-aligned pointer).
*/
#define MemSetAligned(start, val, len) \
do \
{ \
long *_start = (long *) (start); \
int _val = (val); \
Size _len = (len); \
\
if ((_len & LONG_ALIGN_MASK) == 0 && \
_val == 0 && \
_len <= MEMSET_LOOP_LIMIT && \
MEMSET_LOOP_LIMIT != 0) \
{ \
long *_stop = (long *) ((char *) _start + _len); \
while (_start < _stop) \
*_start++ = 0; \
} \
else \
memset(_start, _val, _len); \
} while (0)
/*
* MemSetTest/MemSetLoop are a variant version that allow all the tests in
* MemSet to be done at compile time in cases where "val" and "len" are
* constants *and* we know the "start" pointer must be word-aligned.
* If MemSetTest succeeds, then it is okay to use MemSetLoop, otherwise use
* MemSetAligned. Beware of multiple evaluations of the arguments when using