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1 /*-------------------------------------------------------------------------
2  *
3  * c.h
4  * Fundamental C definitions. This is included by every .c file in
5  * PostgreSQL (via either postgres.h or postgres_fe.h, as appropriate).
6  *
7  * Note that the definitions here are not intended to be exposed to clients
8  * of the frontend interface libraries --- so we don't worry much about
9  * polluting the namespace with lots of stuff...
10  *
11  *
12  * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
13  * Portions Copyright (c) 1994, Regents of the University of California
14  *
15  * src/include/c.h
16  *
17  *-------------------------------------------------------------------------
18  */
19 /*
20  *----------------------------------------------------------------
21  * TABLE OF CONTENTS
22  *
23  * When adding stuff to this file, please try to put stuff
24  * into the relevant section, or add new sections as appropriate.
25  *
26  * section description
27  * ------- ------------------------------------------------
28  * 0) pg_config.h and standard system headers
29  * 1) compiler characteristics
30  * 2) bool, true, false
31  * 3) standard system types
32  * 4) IsValid macros for system types
33  * 5) offsetof, lengthof, alignment
34  * 6) assertions
35  * 7) widely useful macros
36  * 8) random stuff
37  * 9) system-specific hacks
38  *
39  * NOTE: since this file is included by both frontend and backend modules,
40  * it's usually wrong to put an "extern" declaration here, unless it's
41  * ifdef'd so that it's seen in only one case or the other.
42  * typedefs and macros are the kind of thing that might go here.
43  *
44  *----------------------------------------------------------------
45  */
46 #ifndef C_H
47 #define C_H
48 
49 #include "postgres_ext.h"
50 
51 /* Must undef pg_config_ext.h symbols before including pg_config.h */
52 #undef PG_INT64_TYPE
53 
54 #include "pg_config.h"
55 #include "pg_config_manual.h" /* must be after pg_config.h */
56 #include "pg_config_os.h" /* must be before any system header files */
57 
58 /* System header files that should be available everywhere in Postgres */
59 #include <stdio.h>
60 #include <stdlib.h>
61 #include <string.h>
62 #include <stddef.h>
63 #include <stdarg.h>
64 #ifdef HAVE_STRINGS_H
65 #include <strings.h>
66 #endif
67 #include <stdint.h>
68 #include <sys/types.h>
69 #include <errno.h>
70 #if defined(WIN32) || defined(__CYGWIN__)
71 #include <fcntl.h> /* ensure O_BINARY is available */
72 #endif
73 #include <locale.h>
74 #ifdef ENABLE_NLS
75 #include <libintl.h>
76 #endif
77 
78 
79 /* ----------------------------------------------------------------
80  * Section 1: compiler characteristics
81  *
82  * type prefixes (const, signed, volatile, inline) are handled in pg_config.h.
83  * ----------------------------------------------------------------
84  */
85 
86 /*
87  * Disable "inline" if PG_FORCE_DISABLE_INLINE is defined.
88  * This is used to work around compiler bugs and might also be useful for
89  * investigatory purposes.
90  */
91 #ifdef PG_FORCE_DISABLE_INLINE
92 #undef inline
93 #define inline
94 #endif
95 
96 /*
97  * Attribute macros
98  *
99  * GCC: https://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
100  * GCC: https://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html
101  * Sunpro: https://docs.oracle.com/cd/E18659_01/html/821-1384/gjzke.html
102  * XLC: https://www.ibm.com/support/knowledgecenter/SSGH2K_13.1.2/com.ibm.xlc131.aix.doc/language_ref/function_attributes.html
103  * XLC: https://www.ibm.com/support/knowledgecenter/SSGH2K_13.1.2/com.ibm.xlc131.aix.doc/language_ref/type_attrib.html
104  */
105 
106 /* only GCC supports the unused attribute */
107 #ifdef __GNUC__
108 #define pg_attribute_unused() __attribute__((unused))
109 #else
110 #define pg_attribute_unused()
111 #endif
112 
113 /*
114  * Append PG_USED_FOR_ASSERTS_ONLY to definitions of variables that are only
115  * used in assert-enabled builds, to avoid compiler warnings about unused
116  * variables in assert-disabled builds.
117  */
118 #ifdef USE_ASSERT_CHECKING
119 #define PG_USED_FOR_ASSERTS_ONLY
120 #else
121 #define PG_USED_FOR_ASSERTS_ONLY pg_attribute_unused()
122 #endif
123 
124 /* GCC and XLC support format attributes */
125 #if defined(__GNUC__) || defined(__IBMC__)
126 #define pg_attribute_format_arg(a) __attribute__((format_arg(a)))
127 #define pg_attribute_printf(f,a) __attribute__((format(PG_PRINTF_ATTRIBUTE, f, a)))
128 #else
129 #define pg_attribute_format_arg(a)
130 #define pg_attribute_printf(f,a)
131 #endif
132 
133 /* GCC, Sunpro and XLC support aligned, packed and noreturn */
134 #if defined(__GNUC__) || defined(__SUNPRO_C) || defined(__IBMC__)
135 #define pg_attribute_aligned(a) __attribute__((aligned(a)))
136 #define pg_attribute_noreturn() __attribute__((noreturn))
137 #define pg_attribute_packed() __attribute__((packed))
138 #define HAVE_PG_ATTRIBUTE_NORETURN 1
139 #else
140 /*
141  * NB: aligned and packed are not given default definitions because they
142  * affect code functionality; they *must* be implemented by the compiler
143  * if they are to be used.
144  */
145 #define pg_attribute_noreturn()
146 #endif
147 
148 /*
149  * Use "pg_attribute_always_inline" in place of "inline" for functions that
150  * we wish to force inlining of, even when the compiler's heuristics would
151  * choose not to. But, if possible, don't force inlining in unoptimized
152  * debug builds.
153  */
154 #if (defined(__GNUC__) && __GNUC__ > 3 && defined(__OPTIMIZE__)) || defined(__SUNPRO_C) || defined(__IBMC__)
155 /* GCC > 3, Sunpro and XLC support always_inline via __attribute__ */
156 #define pg_attribute_always_inline __attribute__((always_inline)) inline
157 #elif defined(_MSC_VER)
158 /* MSVC has a special keyword for this */
159 #define pg_attribute_always_inline __forceinline
160 #else
161 /* Otherwise, the best we can do is to say "inline" */
162 #define pg_attribute_always_inline inline
163 #endif
164 
165 /*
166  * Forcing a function not to be inlined can be useful if it's the slow path of
167  * a performance-critical function, or should be visible in profiles to allow
168  * for proper cost attribution. Note that unlike the pg_attribute_XXX macros
169  * above, this should be placed before the function's return type and name.
170  */
171 /* GCC, Sunpro and XLC support noinline via __attribute__ */
172 #if (defined(__GNUC__) && __GNUC__ > 2) || defined(__SUNPRO_C) || defined(__IBMC__)
173 #define pg_noinline __attribute__((noinline))
174 /* msvc via declspec */
175 #elif defined(_MSC_VER)
176 #define pg_noinline __declspec(noinline)
177 #else
178 #define pg_noinline
179 #endif
180 
181 /*
182  * Mark a point as unreachable in a portable fashion. This should preferably
183  * be something that the compiler understands, to aid code generation.
184  * In assert-enabled builds, we prefer abort() for debugging reasons.
185  */
186 #if defined(HAVE__BUILTIN_UNREACHABLE) && !defined(USE_ASSERT_CHECKING)
187 #define pg_unreachable() __builtin_unreachable()
188 #elif defined(_MSC_VER) && !defined(USE_ASSERT_CHECKING)
189 #define pg_unreachable() __assume(0)
190 #else
191 #define pg_unreachable() abort()
192 #endif
193 
194 /*
195  * Hints to the compiler about the likelihood of a branch. Both likely() and
196  * unlikely() return the boolean value of the contained expression.
197  *
198  * These should only be used sparingly, in very hot code paths. It's very easy
199  * to mis-estimate likelihoods.
200  */
201 #if __GNUC__ >= 3
202 #define likely(x) __builtin_expect((x) != 0, 1)
203 #define unlikely(x) __builtin_expect((x) != 0, 0)
204 #else
205 #define likely(x) ((x) != 0)
206 #define unlikely(x) ((x) != 0)
207 #endif
208 
209 /*
210  * CppAsString
211  * Convert the argument to a string, using the C preprocessor.
212  * CppAsString2
213  * Convert the argument to a string, after one round of macro expansion.
214  * CppConcat
215  * Concatenate two arguments together, using the C preprocessor.
216  *
217  * Note: There used to be support here for pre-ANSI C compilers that didn't
218  * support # and ##. Nowadays, these macros are just for clarity and/or
219  * backward compatibility with existing PostgreSQL code.
220  */
221 #define CppAsString(identifier) #identifier
222 #define CppAsString2(x) CppAsString(x)
223 #define CppConcat(x, y) x##y
224 
225 /*
226  * VA_ARGS_NARGS
227  * Returns the number of macro arguments it is passed.
228  *
229  * An empty argument still counts as an argument, so effectively, this is
230  * "one more than the number of commas in the argument list".
231  *
232  * This works for up to 63 arguments. Internally, VA_ARGS_NARGS_() is passed
233  * 64+N arguments, and the C99 standard only requires macros to allow up to
234  * 127 arguments, so we can't portably go higher. The implementation is
235  * pretty trivial: VA_ARGS_NARGS_() returns its 64th argument, and we set up
236  * the call so that that is the appropriate one of the list of constants.
237  * This idea is due to Laurent Deniau.
238  */
239 #define VA_ARGS_NARGS(...) \
240  VA_ARGS_NARGS_(__VA_ARGS__, \
241  63,62,61,60, \
242  59,58,57,56,55,54,53,52,51,50, \
243  49,48,47,46,45,44,43,42,41,40, \
244  39,38,37,36,35,34,33,32,31,30, \
245  29,28,27,26,25,24,23,22,21,20, \
246  19,18,17,16,15,14,13,12,11,10, \
247  9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
248 #define VA_ARGS_NARGS_( \
249  _01,_02,_03,_04,_05,_06,_07,_08,_09,_10, \
250  _11,_12,_13,_14,_15,_16,_17,_18,_19,_20, \
251  _21,_22,_23,_24,_25,_26,_27,_28,_29,_30, \
252  _31,_32,_33,_34,_35,_36,_37,_38,_39,_40, \
253  _41,_42,_43,_44,_45,_46,_47,_48,_49,_50, \
254  _51,_52,_53,_54,_55,_56,_57,_58,_59,_60, \
255  _61,_62,_63, N, ...) \
256  (N)
257 
258 /*
259  * dummyret is used to set return values in macros that use ?: to make
260  * assignments. gcc wants these to be void, other compilers like char
261  */
262 #ifdef __GNUC__ /* GNU cc */
263 #define dummyret void
264 #else
265 #define dummyret char
266 #endif
267 
268 /*
269  * Generic function pointer. This can be used in the rare cases where it's
270  * necessary to cast a function pointer to a seemingly incompatible function
271  * pointer type while avoiding gcc's -Wcast-function-type warnings.
272  */
273 typedef void (*pg_funcptr_t) (void);
274 
275 /*
276  * We require C99, hence the compiler should understand flexible array
277  * members. However, for documentation purposes we still consider it to be
278  * project style to write "field[FLEXIBLE_ARRAY_MEMBER]" not just "field[]".
279  * When computing the size of such an object, use "offsetof(struct s, f)"
280  * for portability. Don't use "offsetof(struct s, f[0])", as this doesn't
281  * work with MSVC and with C++ compilers.
282  */
283 #define FLEXIBLE_ARRAY_MEMBER /* empty */
284 
285 /* Which __func__ symbol do we have, if any? */
286 #ifdef HAVE_FUNCNAME__FUNC
287 #define PG_FUNCNAME_MACRO __func__
288 #else
289 #ifdef HAVE_FUNCNAME__FUNCTION
290 #define PG_FUNCNAME_MACRO __FUNCTION__
291 #else
292 #define PG_FUNCNAME_MACRO NULL
293 #endif
294 #endif
295 
296 
297 /* ----------------------------------------------------------------
298  * Section 2: bool, true, false
299  * ----------------------------------------------------------------
300  */
301 
302 /*
303  * bool
304  * Boolean value, either true or false.
305  *
306  * We use stdbool.h if available and its bool has size 1. That's useful for
307  * better compiler and debugger output and for compatibility with third-party
308  * libraries. But PostgreSQL currently cannot deal with bool of other sizes;
309  * there are static assertions around the code to prevent that.
310  *
311  * For C++ compilers, we assume the compiler has a compatible built-in
312  * definition of bool.
313  *
314  * See also the version of this code in src/interfaces/ecpg/include/ecpglib.h.
315  */
316 
317 #ifndef __cplusplus
318 
319 #ifdef PG_USE_STDBOOL
320 #include <stdbool.h>
321 #else
322 
323 #ifndef bool
324 typedef unsigned char bool;
325 #endif
326 
327 #ifndef true
328 #define true ((bool) 1)
329 #endif
330 
331 #ifndef false
332 #define false ((bool) 0)
333 #endif
334 
335 #endif /* not PG_USE_STDBOOL */
336 #endif /* not C++ */
337 
338 
339 /* ----------------------------------------------------------------
340  * Section 3: standard system types
341  * ----------------------------------------------------------------
342  */
343 
344 /*
345  * Pointer
346  * Variable holding address of any memory resident object.
347  *
348  * XXX Pointer arithmetic is done with this, so it can't be void *
349  * under "true" ANSI compilers.
350  */
351 typedef char *Pointer;
352 
353 /*
354  * intN
355  * Signed integer, EXACTLY N BITS IN SIZE,
356  * used for numerical computations and the
357  * frontend/backend protocol.
358  */
359 #ifndef HAVE_INT8
360 typedef signed char int8; /* == 8 bits */
361 typedef signed short int16; /* == 16 bits */
362 typedef signed int int32; /* == 32 bits */
363 #endif /* not HAVE_INT8 */
364 
365 /*
366  * uintN
367  * Unsigned integer, EXACTLY N BITS IN SIZE,
368  * used for numerical computations and the
369  * frontend/backend protocol.
370  */
371 #ifndef HAVE_UINT8
372 typedef unsigned char uint8; /* == 8 bits */
373 typedef unsigned short uint16; /* == 16 bits */
374 typedef unsigned int uint32; /* == 32 bits */
375 #endif /* not HAVE_UINT8 */
376 
377 /*
378  * bitsN
379  * Unit of bitwise operation, AT LEAST N BITS IN SIZE.
380  */
381 typedef uint8 bits8; /* >= 8 bits */
382 typedef uint16 bits16; /* >= 16 bits */
383 typedef uint32 bits32; /* >= 32 bits */
384 
385 /*
386  * 64-bit integers
387  */
388 #ifdef HAVE_LONG_INT_64
389 /* Plain "long int" fits, use it */
390 
391 #ifndef HAVE_INT64
392 typedef long int int64;
393 #endif
394 #ifndef HAVE_UINT64
395 typedef unsigned long int uint64;
396 #endif
397 #define INT64CONST(x) (x##L)
398 #define UINT64CONST(x) (x##UL)
399 #elif defined(HAVE_LONG_LONG_INT_64)
400 /* We have working support for "long long int", use that */
401 
402 #ifndef HAVE_INT64
403 typedef long long int int64;
404 #endif
405 #ifndef HAVE_UINT64
406 typedef unsigned long long int uint64;
407 #endif
408 #define INT64CONST(x) (x##LL)
409 #define UINT64CONST(x) (x##ULL)
410 #else
411 /* neither HAVE_LONG_INT_64 nor HAVE_LONG_LONG_INT_64 */
412 #error must have a working 64-bit integer datatype
413 #endif
414 
415 /* snprintf format strings to use for 64-bit integers */
416 #define INT64_FORMAT "%" INT64_MODIFIER "d"
417 #define UINT64_FORMAT "%" INT64_MODIFIER "u"
418 
419 /*
420  * 128-bit signed and unsigned integers
421  * There currently is only limited support for such types.
422  * E.g. 128bit literals and snprintf are not supported; but math is.
423  * Also, because we exclude such types when choosing MAXIMUM_ALIGNOF,
424  * it must be possible to coerce the compiler to allocate them on no
425  * more than MAXALIGN boundaries.
426  */
427 #if defined(PG_INT128_TYPE)
428 #if defined(pg_attribute_aligned) || ALIGNOF_PG_INT128_TYPE <= MAXIMUM_ALIGNOF
429 #define HAVE_INT128 1
430 
431 typedef PG_INT128_TYPE int128
432 #if defined(pg_attribute_aligned)
433  pg_attribute_aligned(MAXIMUM_ALIGNOF)
434 #endif
435  ;
436 
437 typedef unsigned PG_INT128_TYPE uint128
438 #if defined(pg_attribute_aligned)
439  pg_attribute_aligned(MAXIMUM_ALIGNOF)
440 #endif
441  ;
442 
443 #endif
444 #endif
445 
446 /*
447  * stdint.h limits aren't guaranteed to have compatible types with our fixed
448  * width types. So just define our own.
449  */
450 #define PG_INT8_MIN (-0x7F-1)
451 #define PG_INT8_MAX (0x7F)
452 #define PG_UINT8_MAX (0xFF)
453 #define PG_INT16_MIN (-0x7FFF-1)
454 #define PG_INT16_MAX (0x7FFF)
455 #define PG_UINT16_MAX (0xFFFF)
456 #define PG_INT32_MIN (-0x7FFFFFFF-1)
457 #define PG_INT32_MAX (0x7FFFFFFF)
458 #define PG_UINT32_MAX (0xFFFFFFFFU)
459 #define PG_INT64_MIN (-INT64CONST(0x7FFFFFFFFFFFFFFF) - 1)
460 #define PG_INT64_MAX INT64CONST(0x7FFFFFFFFFFFFFFF)
461 #define PG_UINT64_MAX UINT64CONST(0xFFFFFFFFFFFFFFFF)
462 
463 /*
464  * We now always use int64 timestamps, but keep this symbol defined for the
465  * benefit of external code that might test it.
466  */
467 #define HAVE_INT64_TIMESTAMP
468 
469 /*
470  * Size
471  * Size of any memory resident object, as returned by sizeof.
472  */
473 typedef size_t Size;
474 
475 /*
476  * Index
477  * Index into any memory resident array.
478  *
479  * Note:
480  * Indices are non negative.
481  */
482 typedef unsigned int Index;
483 
484 /*
485  * Offset
486  * Offset into any memory resident array.
487  *
488  * Note:
489  * This differs from an Index in that an Index is always
490  * non negative, whereas Offset may be negative.
491  */
492 typedef signed int Offset;
493 
494 /*
495  * Common Postgres datatype names (as used in the catalogs)
496  */
497 typedef float float4;
498 typedef double float8;
499 
500 #ifdef USE_FLOAT8_BYVAL
501 #define FLOAT8PASSBYVAL true
502 #else
503 #define FLOAT8PASSBYVAL false
504 #endif
505 
506 /*
507  * Oid, RegProcedure, TransactionId, SubTransactionId, MultiXactId,
508  * CommandId
509  */
510 
511 /* typedef Oid is in postgres_ext.h */
512 
513 /*
514  * regproc is the type name used in the include/catalog headers, but
515  * RegProcedure is the preferred name in C code.
516  */
517 typedef Oid regproc;
518 typedef regproc RegProcedure;
519 
521 
523 
525 
526 #define InvalidSubTransactionId ((SubTransactionId) 0)
527 #define TopSubTransactionId ((SubTransactionId) 1)
528 
529 /* MultiXactId must be equivalent to TransactionId, to fit in t_xmax */
530 typedef TransactionId MultiXactId;
531 
533 
535 
536 #define FirstCommandId ((CommandId) 0)
537 #define InvalidCommandId (~(CommandId)0)
538 
539 /*
540  * Array indexing support
541  */
542 #define MAXDIM 6
543 typedef struct
544 {
545  int indx[MAXDIM];
546 } IntArray;
547 
548 /* ----------------
549  * Variable-length datatypes all share the 'struct varlena' header.
550  *
551  * NOTE: for TOASTable types, this is an oversimplification, since the value
552  * may be compressed or moved out-of-line. However datatype-specific routines
553  * are mostly content to deal with de-TOASTed values only, and of course
554  * client-side routines should never see a TOASTed value. But even in a
555  * de-TOASTed value, beware of touching vl_len_ directly, as its
556  * representation is no longer convenient. It's recommended that code always
557  * use macros VARDATA_ANY, VARSIZE_ANY, VARSIZE_ANY_EXHDR, VARDATA, VARSIZE,
558  * and SET_VARSIZE instead of relying on direct mentions of the struct fields.
559  * See postgres.h for details of the TOASTed form.
560  * ----------------
561  */
562 struct varlena
563 {
564  char vl_len_[4]; /* Do not touch this field directly! */
565  char vl_dat[FLEXIBLE_ARRAY_MEMBER]; /* Data content is here */
566 };
567 
568 #define VARHDRSZ ((int32) sizeof(int32))
569 
570 /*
571  * These widely-used datatypes are just a varlena header and the data bytes.
572  * There is no terminating null or anything like that --- the data length is
573  * always VARSIZE_ANY_EXHDR(ptr).
574  */
575 typedef struct varlena bytea;
576 typedef struct varlena text;
577 typedef struct varlena BpChar; /* blank-padded char, ie SQL char(n) */
578 typedef struct varlena VarChar; /* var-length char, ie SQL varchar(n) */
579 
580 /*
581  * Specialized array types. These are physically laid out just the same
582  * as regular arrays (so that the regular array subscripting code works
583  * with them). They exist as distinct types mostly for historical reasons:
584  * they have nonstandard I/O behavior which we don't want to change for fear
585  * of breaking applications that look at the system catalogs. There is also
586  * an implementation issue for oidvector: it's part of the primary key for
587  * pg_proc, and we can't use the normal btree array support routines for that
588  * without circularity.
589  */
590 typedef struct
591 {
592  int32 vl_len_; /* these fields must match ArrayType! */
593  int ndim; /* always 1 for int2vector */
594  int32 dataoffset; /* always 0 for int2vector */
596  int dim1;
597  int lbound1;
599 } int2vector;
600 
601 typedef struct
602 {
603  int32 vl_len_; /* these fields must match ArrayType! */
604  int ndim; /* always 1 for oidvector */
605  int32 dataoffset; /* always 0 for oidvector */
607  int dim1;
608  int lbound1;
610 } oidvector;
611 
612 /*
613  * Representation of a Name: effectively just a C string, but null-padded to
614  * exactly NAMEDATALEN bytes. The use of a struct is historical.
615  */
616 typedef struct nameData
617 {
618  char data[NAMEDATALEN];
619 } NameData;
620 typedef NameData *Name;
621 
622 #define NameStr(name) ((name).data)
623 
624 
625 /* ----------------------------------------------------------------
626  * Section 4: IsValid macros for system types
627  * ----------------------------------------------------------------
628  */
629 /*
630  * BoolIsValid
631  * True iff bool is valid.
632  */
633 #define BoolIsValid(boolean) ((boolean) == false || (boolean) == true)
634 
635 /*
636  * PointerIsValid
637  * True iff pointer is valid.
638  */
639 #define PointerIsValid(pointer) ((const void*)(pointer) != NULL)
640 
641 /*
642  * PointerIsAligned
643  * True iff pointer is properly aligned to point to the given type.
644  */
645 #define PointerIsAligned(pointer, type) \
646  (((uintptr_t)(pointer) % (sizeof (type))) == 0)
647 
648 #define OffsetToPointer(base, offset) \
649  ((void *)((char *) base + offset))
650 
651 #define OidIsValid(objectId) ((bool) ((objectId) != InvalidOid))
652 
653 #define RegProcedureIsValid(p) OidIsValid(p)
654 
655 
656 /* ----------------------------------------------------------------
657  * Section 5: offsetof, lengthof, alignment
658  * ----------------------------------------------------------------
659  */
660 /*
661  * offsetof
662  * Offset of a structure/union field within that structure/union.
663  *
664  * XXX This is supposed to be part of stddef.h, but isn't on
665  * some systems (like SunOS 4).
666  */
667 #ifndef offsetof
668 #define offsetof(type, field) ((long) &((type *)0)->field)
669 #endif /* offsetof */
670 
671 /*
672  * lengthof
673  * Number of elements in an array.
674  */
675 #define lengthof(array) (sizeof (array) / sizeof ((array)[0]))
676 
677 /* ----------------
678  * Alignment macros: align a length or address appropriately for a given type.
679  * The fooALIGN() macros round up to a multiple of the required alignment,
680  * while the fooALIGN_DOWN() macros round down. The latter are more useful
681  * for problems like "how many X-sized structures will fit in a page?".
682  *
683  * NOTE: TYPEALIGN[_DOWN] will not work if ALIGNVAL is not a power of 2.
684  * That case seems extremely unlikely to be needed in practice, however.
685  *
686  * NOTE: MAXIMUM_ALIGNOF, and hence MAXALIGN(), intentionally exclude any
687  * larger-than-8-byte types the compiler might have.
688  * ----------------
689  */
690 
691 #define TYPEALIGN(ALIGNVAL,LEN) \
692  (((uintptr_t) (LEN) + ((ALIGNVAL) - 1)) & ~((uintptr_t) ((ALIGNVAL) - 1)))
693 
694 #define SHORTALIGN(LEN) TYPEALIGN(ALIGNOF_SHORT, (LEN))
695 #define INTALIGN(LEN) TYPEALIGN(ALIGNOF_INT, (LEN))
696 #define LONGALIGN(LEN) TYPEALIGN(ALIGNOF_LONG, (LEN))
697 #define DOUBLEALIGN(LEN) TYPEALIGN(ALIGNOF_DOUBLE, (LEN))
698 #define MAXALIGN(LEN) TYPEALIGN(MAXIMUM_ALIGNOF, (LEN))
699 /* MAXALIGN covers only built-in types, not buffers */
700 #define BUFFERALIGN(LEN) TYPEALIGN(ALIGNOF_BUFFER, (LEN))
701 #define CACHELINEALIGN(LEN) TYPEALIGN(PG_CACHE_LINE_SIZE, (LEN))
702 
703 #define TYPEALIGN_DOWN(ALIGNVAL,LEN) \
704  (((uintptr_t) (LEN)) & ~((uintptr_t) ((ALIGNVAL) - 1)))
705 
706 #define SHORTALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_SHORT, (LEN))
707 #define INTALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_INT, (LEN))
708 #define LONGALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_LONG, (LEN))
709 #define DOUBLEALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_DOUBLE, (LEN))
710 #define MAXALIGN_DOWN(LEN) TYPEALIGN_DOWN(MAXIMUM_ALIGNOF, (LEN))
711 #define BUFFERALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_BUFFER, (LEN))
712 
713 /*
714  * The above macros will not work with types wider than uintptr_t, like with
715  * uint64 on 32-bit platforms. That's not problem for the usual use where a
716  * pointer or a length is aligned, but for the odd case that you need to
717  * align something (potentially) wider, use TYPEALIGN64.
718  */
719 #define TYPEALIGN64(ALIGNVAL,LEN) \
720  (((uint64) (LEN) + ((ALIGNVAL) - 1)) & ~((uint64) ((ALIGNVAL) - 1)))
721 
722 /* we don't currently need wider versions of the other ALIGN macros */
723 #define MAXALIGN64(LEN) TYPEALIGN64(MAXIMUM_ALIGNOF, (LEN))
724 
725 
726 /* ----------------------------------------------------------------
727  * Section 6: assertions
728  * ----------------------------------------------------------------
729  */
730 
731 /*
732  * USE_ASSERT_CHECKING, if defined, turns on all the assertions.
733  * - plai 9/5/90
734  *
735  * It should _NOT_ be defined in releases or in benchmark copies
736  */
737 
738 /*
739  * Assert() can be used in both frontend and backend code. In frontend code it
740  * just calls the standard assert, if it's available. If use of assertions is
741  * not configured, it does nothing.
742  */
743 #ifndef USE_ASSERT_CHECKING
744 
745 #define Assert(condition) ((void)true)
746 #define AssertMacro(condition) ((void)true)
747 #define AssertArg(condition) ((void)true)
748 #define AssertState(condition) ((void)true)
749 #define AssertPointerAlignment(ptr, bndr) ((void)true)
750 #define Trap(condition, errorType) ((void)true)
751 #define TrapMacro(condition, errorType) (true)
752 
753 #elif defined(FRONTEND)
754 
755 #include <assert.h>
756 #define Assert(p) assert(p)
757 #define AssertMacro(p) ((void) assert(p))
758 #define AssertArg(condition) assert(condition)
759 #define AssertState(condition) assert(condition)
760 #define AssertPointerAlignment(ptr, bndr) ((void)true)
761 
762 #else /* USE_ASSERT_CHECKING && !FRONTEND */
763 
764 /*
765  * Trap
766  * Generates an exception if the given condition is true.
767  */
768 #define Trap(condition, errorType) \
769  do { \
770  if (condition) \
771  ExceptionalCondition(#condition, (errorType), \
772  __FILE__, __LINE__); \
773  } while (0)
774 
775 /*
776  * TrapMacro is the same as Trap but it's intended for use in macros:
777  *
778  * #define foo(x) (AssertMacro(x != 0), bar(x))
779  *
780  * Isn't CPP fun?
781  */
782 #define TrapMacro(condition, errorType) \
783  ((bool) (! (condition) || \
784  (ExceptionalCondition(#condition, (errorType), \
785  __FILE__, __LINE__), 0)))
786 
787 #define Assert(condition) \
788  do { \
789  if (!(condition)) \
790  ExceptionalCondition(#condition, "FailedAssertion", \
791  __FILE__, __LINE__); \
792  } while (0)
793 
794 #define AssertMacro(condition) \
795  ((void) ((condition) || \
796  (ExceptionalCondition(#condition, "FailedAssertion", \
797  __FILE__, __LINE__), 0)))
798 
799 #define AssertArg(condition) \
800  do { \
801  if (!(condition)) \
802  ExceptionalCondition(#condition, "BadArgument", \
803  __FILE__, __LINE__); \
804  } while (0)
805 
806 #define AssertState(condition) \
807  do { \
808  if (!(condition)) \
809  ExceptionalCondition(#condition, "BadState", \
810  __FILE__, __LINE__); \
811  } while (0)
812 
813 /*
814  * Check that `ptr' is `bndr' aligned.
815  */
816 #define AssertPointerAlignment(ptr, bndr) \
817  Trap(TYPEALIGN(bndr, (uintptr_t)(ptr)) != (uintptr_t)(ptr), \
818  "UnalignedPointer")
819 
820 #endif /* USE_ASSERT_CHECKING && !FRONTEND */
821 
822 /*
823  * ExceptionalCondition is compiled into the backend whether or not
824  * USE_ASSERT_CHECKING is defined, so as to support use of extensions
825  * that are built with that #define with a backend that isn't. Hence,
826  * we should declare it as long as !FRONTEND.
827  */
828 #ifndef FRONTEND
829 extern void ExceptionalCondition(const char *conditionName,
830  const char *errorType,
831  const char *fileName, int lineNumber) pg_attribute_noreturn();
832 #endif
833 
834 /*
835  * Macros to support compile-time assertion checks.
836  *
837  * If the "condition" (a compile-time-constant expression) evaluates to false,
838  * throw a compile error using the "errmessage" (a string literal).
839  *
840  * gcc 4.6 and up supports _Static_assert(), but there are bizarre syntactic
841  * placement restrictions. Macros StaticAssertStmt() and StaticAssertExpr()
842  * make it safe to use as a statement or in an expression, respectively.
843  * The macro StaticAssertDecl() is suitable for use at file scope (outside of
844  * any function).
845  *
846  * Otherwise we fall back on a kluge that assumes the compiler will complain
847  * about a negative width for a struct bit-field. This will not include a
848  * helpful error message, but it beats not getting an error at all.
849  */
850 #ifndef __cplusplus
851 #ifdef HAVE__STATIC_ASSERT
852 #define StaticAssertStmt(condition, errmessage) \
853  do { _Static_assert(condition, errmessage); } while(0)
854 #define StaticAssertExpr(condition, errmessage) \
855  ((void) ({ StaticAssertStmt(condition, errmessage); true; }))
856 #define StaticAssertDecl(condition, errmessage) \
857  _Static_assert(condition, errmessage)
858 #else /* !HAVE__STATIC_ASSERT */
859 #define StaticAssertStmt(condition, errmessage) \
860  ((void) sizeof(struct { int static_assert_failure : (condition) ? 1 : -1; }))
861 #define StaticAssertExpr(condition, errmessage) \
862  StaticAssertStmt(condition, errmessage)
863 #define StaticAssertDecl(condition, errmessage) \
864  extern void static_assert_func(int static_assert_failure[(condition) ? 1 : -1])
865 #endif /* HAVE__STATIC_ASSERT */
866 #else /* C++ */
867 #if defined(__cpp_static_assert) && __cpp_static_assert >= 200410
868 #define StaticAssertStmt(condition, errmessage) \
869  static_assert(condition, errmessage)
870 #define StaticAssertExpr(condition, errmessage) \
871  ({ static_assert(condition, errmessage); })
872 #define StaticAssertDecl(condition, errmessage) \
873  static_assert(condition, errmessage)
874 #else /* !__cpp_static_assert */
875 #define StaticAssertStmt(condition, errmessage) \
876  do { struct static_assert_struct { int static_assert_failure : (condition) ? 1 : -1; }; } while(0)
877 #define StaticAssertExpr(condition, errmessage) \
878  ((void) ({ StaticAssertStmt(condition, errmessage); }))
879 #define StaticAssertDecl(condition, errmessage) \
880  extern void static_assert_func(int static_assert_failure[(condition) ? 1 : -1])
881 #endif /* __cpp_static_assert */
882 #endif /* C++ */
883 
884 
885 /*
886  * Compile-time checks that a variable (or expression) has the specified type.
887  *
888  * AssertVariableIsOfType() can be used as a statement.
889  * AssertVariableIsOfTypeMacro() is intended for use in macros, eg
890  * #define foo(x) (AssertVariableIsOfTypeMacro(x, int), bar(x))
891  *
892  * If we don't have __builtin_types_compatible_p, we can still assert that
893  * the types have the same size. This is far from ideal (especially on 32-bit
894  * platforms) but it provides at least some coverage.
895  */
896 #ifdef HAVE__BUILTIN_TYPES_COMPATIBLE_P
897 #define AssertVariableIsOfType(varname, typename) \
898  StaticAssertStmt(__builtin_types_compatible_p(__typeof__(varname), typename), \
899  CppAsString(varname) " does not have type " CppAsString(typename))
900 #define AssertVariableIsOfTypeMacro(varname, typename) \
901  (StaticAssertExpr(__builtin_types_compatible_p(__typeof__(varname), typename), \
902  CppAsString(varname) " does not have type " CppAsString(typename)))
903 #else /* !HAVE__BUILTIN_TYPES_COMPATIBLE_P */
904 #define AssertVariableIsOfType(varname, typename) \
905  StaticAssertStmt(sizeof(varname) == sizeof(typename), \
906  CppAsString(varname) " does not have type " CppAsString(typename))
907 #define AssertVariableIsOfTypeMacro(varname, typename) \
908  (StaticAssertExpr(sizeof(varname) == sizeof(typename), \
909  CppAsString(varname) " does not have type " CppAsString(typename)))
910 #endif /* HAVE__BUILTIN_TYPES_COMPATIBLE_P */
911 
912 
913 /* ----------------------------------------------------------------
914  * Section 7: widely useful macros
915  * ----------------------------------------------------------------
916  */
917 /*
918  * Max
919  * Return the maximum of two numbers.
920  */
921 #define Max(x, y) ((x) > (y) ? (x) : (y))
922 
923 /*
924  * Min
925  * Return the minimum of two numbers.
926  */
927 #define Min(x, y) ((x) < (y) ? (x) : (y))
928 
929 /*
930  * Abs
931  * Return the absolute value of the argument.
932  */
933 #define Abs(x) ((x) >= 0 ? (x) : -(x))
934 
935 
936 /* Get a bit mask of the bits set in non-long aligned addresses */
937 #define LONG_ALIGN_MASK (sizeof(long) - 1)
938 
939 /*
940  * MemSet
941  * Exactly the same as standard library function memset(), but considerably
942  * faster for zeroing small word-aligned structures (such as parsetree nodes).
943  * This has to be a macro because the main point is to avoid function-call
944  * overhead. However, we have also found that the loop is faster than
945  * native libc memset() on some platforms, even those with assembler
946  * memset() functions. More research needs to be done, perhaps with
947  * MEMSET_LOOP_LIMIT tests in configure.
948  */
949 #define MemSet(start, val, len) \
950  do \
951  { \
952  /* must be void* because we don't know if it is integer aligned yet */ \
953  void *_vstart = (void *) (start); \
954  int _val = (val); \
955  Size _len = (len); \
956 \
957  if ((((uintptr_t) _vstart) & LONG_ALIGN_MASK) == 0 && \
958  (_len & LONG_ALIGN_MASK) == 0 && \
959  _val == 0 && \
960  _len <= MEMSET_LOOP_LIMIT && \
961  /* \
962  * If MEMSET_LOOP_LIMIT == 0, optimizer should find \
963  * the whole "if" false at compile time. \
964  */ \
965  MEMSET_LOOP_LIMIT != 0) \
966  { \
967  long *_start = (long *) _vstart; \
968  long *_stop = (long *) ((char *) _start + _len); \
969  while (_start < _stop) \
970  *_start++ = 0; \
971  } \
972  else \
973  memset(_vstart, _val, _len); \
974  } while (0)
975 
976 /*
977  * MemSetAligned is the same as MemSet except it omits the test to see if
978  * "start" is word-aligned. This is okay to use if the caller knows a-priori
979  * that the pointer is suitably aligned (typically, because he just got it
980  * from palloc(), which always delivers a max-aligned pointer).
981  */
982 #define MemSetAligned(start, val, len) \
983  do \
984  { \
985  long *_start = (long *) (start); \
986  int _val = (val); \
987  Size _len = (len); \
988 \
989  if ((_len & LONG_ALIGN_MASK) == 0 && \
990  _val == 0 && \
991  _len <= MEMSET_LOOP_LIMIT && \
992  MEMSET_LOOP_LIMIT != 0) \
993  { \
994  long *_stop = (long *) ((char *) _start + _len); \
995  while (_start < _stop) \
996  *_start++ = 0; \
997  } \
998  else \
999  memset(_start, _val, _len); \
1000  } while (0)
1001 
1002 
1003 /*
1004  * MemSetTest/MemSetLoop are a variant version that allow all the tests in
1005  * MemSet to be done at compile time in cases where "val" and "len" are
1006  * constants *and* we know the "start" pointer must be word-aligned.
1007  * If MemSetTest succeeds, then it is okay to use MemSetLoop, otherwise use
1008  * MemSetAligned. Beware of multiple evaluations of the arguments when using
1009  * this approach.
1010  */
1011 #define MemSetTest(val, len) \
1012  ( ((len) & LONG_ALIGN_MASK) == 0 && \
1013  (len) <= MEMSET_LOOP_LIMIT && \
1014  MEMSET_LOOP_LIMIT != 0 && \
1015  (val) == 0 )
1016 
1017 #define MemSetLoop(start, val, len) \
1018  do \
1019  { \
1020  long * _start = (long *) (start); \
1021  long * _stop = (long *) ((char *) _start + (Size) (len)); \
1022  \
1023  while (_start < _stop) \
1024  *_start++ = 0; \
1025  } while (0)
1026 
1027 /*
1028  * Macros for range-checking float values before converting to integer.
1029  * We must be careful here that the boundary values are expressed exactly
1030  * in the float domain. PG_INTnn_MIN is an exact power of 2, so it will
1031  * be represented exactly; but PG_INTnn_MAX isn't, and might get rounded
1032  * off, so avoid using that.
1033  * The input must be rounded to an integer beforehand, typically with rint(),
1034  * else we might draw the wrong conclusion about close-to-the-limit values.
1035  * These macros will do the right thing for Inf, but not necessarily for NaN,
1036  * so check isnan(num) first if that's a possibility.
1037  */
1038 #define FLOAT4_FITS_IN_INT16(num) \
1039  ((num) >= (float4) PG_INT16_MIN && (num) < -((float4) PG_INT16_MIN))
1040 #define FLOAT4_FITS_IN_INT32(num) \
1041  ((num) >= (float4) PG_INT32_MIN && (num) < -((float4) PG_INT32_MIN))
1042 #define FLOAT4_FITS_IN_INT64(num) \
1043  ((num) >= (float4) PG_INT64_MIN && (num) < -((float4) PG_INT64_MIN))
1044 #define FLOAT8_FITS_IN_INT16(num) \
1045  ((num) >= (float8) PG_INT16_MIN && (num) < -((float8) PG_INT16_MIN))
1046 #define FLOAT8_FITS_IN_INT32(num) \
1047  ((num) >= (float8) PG_INT32_MIN && (num) < -((float8) PG_INT32_MIN))
1048 #define FLOAT8_FITS_IN_INT64(num) \
1049  ((num) >= (float8) PG_INT64_MIN && (num) < -((float8) PG_INT64_MIN))
1050 
1051 
1052 /* ----------------------------------------------------------------
1053  * Section 8: random stuff
1054  * ----------------------------------------------------------------
1055  */
1056 
1057 #ifdef HAVE_STRUCT_SOCKADDR_UN
1058 #define HAVE_UNIX_SOCKETS 1
1059 #endif
1060 
1061 /*
1062  * Invert the sign of a qsort-style comparison result, ie, exchange negative
1063  * and positive integer values, being careful not to get the wrong answer
1064  * for INT_MIN. The argument should be an integral variable.
1065  */
1066 #define INVERT_COMPARE_RESULT(var) \
1067  ((var) = ((var) < 0) ? 1 : -(var))
1068 
1069 /*
1070  * Use this, not "char buf[BLCKSZ]", to declare a field or local variable
1071  * holding a page buffer, if that page might be accessed as a page and not
1072  * just a string of bytes. Otherwise the variable might be under-aligned,
1073  * causing problems on alignment-picky hardware. (In some places, we use
1074  * this to declare buffers even though we only pass them to read() and
1075  * write(), because copying to/from aligned buffers is usually faster than
1076  * using unaligned buffers.) We include both "double" and "int64" in the
1077  * union to ensure that the compiler knows the value must be MAXALIGN'ed
1078  * (cf. configure's computation of MAXIMUM_ALIGNOF).
1079  */
1080 typedef union PGAlignedBlock
1081 {
1082  char data[BLCKSZ];
1085 } PGAlignedBlock;
1086 
1087 /* Same, but for an XLOG_BLCKSZ-sized buffer */
1088 typedef union PGAlignedXLogBlock
1089 {
1090  char data[XLOG_BLCKSZ];
1094 
1095 /* msb for char */
1096 #define HIGHBIT (0x80)
1097 #define IS_HIGHBIT_SET(ch) ((unsigned char)(ch) & HIGHBIT)
1098 
1099 /*
1100  * Support macros for escaping strings. escape_backslash should be true
1101  * if generating a non-standard-conforming string. Prefixing a string
1102  * with ESCAPE_STRING_SYNTAX guarantees it is non-standard-conforming.
1103  * Beware of multiple evaluation of the "ch" argument!
1104  */
1105 #define SQL_STR_DOUBLE(ch, escape_backslash) \
1106  ((ch) == '\'' || ((ch) == '\\' && (escape_backslash)))
1107 
1108 #define ESCAPE_STRING_SYNTAX 'E'
1109 
1110 
1111 #define STATUS_OK (0)
1112 #define STATUS_ERROR (-1)
1113 #define STATUS_EOF (-2)
1114 
1115 /*
1116  * gettext support
1117  */
1118 
1119 #ifndef ENABLE_NLS
1120 /* stuff we'd otherwise get from <libintl.h> */
1121 #define gettext(x) (x)
1122 #define dgettext(d,x) (x)
1123 #define ngettext(s,p,n) ((n) == 1 ? (s) : (p))
1124 #define dngettext(d,s,p,n) ((n) == 1 ? (s) : (p))
1125 #endif
1126 
1127 #define _(x) gettext(x)
1128 
1129 /*
1130  * Use this to mark string constants as needing translation at some later
1131  * time, rather than immediately. This is useful for cases where you need
1132  * access to the original string and translated string, and for cases where
1133  * immediate translation is not possible, like when initializing global
1134  * variables.
1135  * http://www.gnu.org/software/autoconf/manual/gettext/Special-cases.html
1136  */
1137 #define gettext_noop(x) (x)
1138 
1139 /*
1140  * To better support parallel installations of major PostgreSQL
1141  * versions as well as parallel installations of major library soname
1142  * versions, we mangle the gettext domain name by appending those
1143  * version numbers. The coding rule ought to be that wherever the
1144  * domain name is mentioned as a literal, it must be wrapped into
1145  * PG_TEXTDOMAIN(). The macros below do not work on non-literals; but
1146  * that is somewhat intentional because it avoids having to worry
1147  * about multiple states of premangling and postmangling as the values
1148  * are being passed around.
1149  *
1150  * Make sure this matches the installation rules in nls-global.mk.
1151  */
1152 #ifdef SO_MAJOR_VERSION
1153 #define PG_TEXTDOMAIN(domain) (domain CppAsString2(SO_MAJOR_VERSION) "-" PG_MAJORVERSION)
1154 #else
1155 #define PG_TEXTDOMAIN(domain) (domain "-" PG_MAJORVERSION)
1156 #endif
1157 
1158 /*
1159  * Macro that allows to cast constness and volatile away from an expression, but doesn't
1160  * allow changing the underlying type. Enforcement of the latter
1161  * currently only works for gcc like compilers.
1162  *
1163  * Please note IT IS NOT SAFE to cast constness away if the result will ever
1164  * be modified (it would be undefined behaviour). Doing so anyway can cause
1165  * compiler misoptimizations or runtime crashes (modifying readonly memory).
1166  * It is only safe to use when the result will not be modified, but API
1167  * design or language restrictions prevent you from declaring that
1168  * (e.g. because a function returns both const and non-const variables).
1169  *
1170  * Note that this only works in function scope, not for global variables (it'd
1171  * be nice, but not trivial, to improve that).
1172  */
1173 #if defined(HAVE__BUILTIN_TYPES_COMPATIBLE_P)
1174 #define unconstify(underlying_type, expr) \
1175  (StaticAssertExpr(__builtin_types_compatible_p(__typeof(expr), const underlying_type), \
1176  "wrong cast"), \
1177  (underlying_type) (expr))
1178 #define unvolatize(underlying_type, expr) \
1179  (StaticAssertExpr(__builtin_types_compatible_p(__typeof(expr), volatile underlying_type), \
1180  "wrong cast"), \
1181  (underlying_type) (expr))
1182 #else
1183 #define unconstify(underlying_type, expr) \
1184  ((underlying_type) (expr))
1185 #define unvolatize(underlying_type, expr) \
1186  ((underlying_type) (expr))
1187 #endif
1188 
1189 /* ----------------------------------------------------------------
1190  * Section 9: system-specific hacks
1191  *
1192  * This should be limited to things that absolutely have to be
1193  * included in every source file. The port-specific header file
1194  * is usually a better place for this sort of thing.
1195  * ----------------------------------------------------------------
1196  */
1197 
1198 /*
1199  * NOTE: this is also used for opening text files.
1200  * WIN32 treats Control-Z as EOF in files opened in text mode.
1201  * Therefore, we open files in binary mode on Win32 so we can read
1202  * literal control-Z. The other affect is that we see CRLF, but
1203  * that is OK because we can already handle those cleanly.
1204  */
1205 #if defined(WIN32) || defined(__CYGWIN__)
1206 #define PG_BINARY O_BINARY
1207 #define PG_BINARY_A "ab"
1208 #define PG_BINARY_R "rb"
1209 #define PG_BINARY_W "wb"
1210 #else
1211 #define PG_BINARY 0
1212 #define PG_BINARY_A "a"
1213 #define PG_BINARY_R "r"
1214 #define PG_BINARY_W "w"
1215 #endif
1216 
1217 /*
1218  * Provide prototypes for routines not present in a particular machine's
1219  * standard C library.
1220  */
1221 
1222 #if defined(HAVE_FDATASYNC) && !HAVE_DECL_FDATASYNC
1223 extern int fdatasync(int fildes);
1224 #endif
1225 
1226 /* Older platforms may provide strto[u]ll functionality under other names */
1227 #if !defined(HAVE_STRTOLL) && defined(HAVE___STRTOLL)
1228 #define strtoll __strtoll
1229 #define HAVE_STRTOLL 1
1230 #endif
1231 
1232 #if !defined(HAVE_STRTOLL) && defined(HAVE_STRTOQ)
1233 #define strtoll strtoq
1234 #define HAVE_STRTOLL 1
1235 #endif
1236 
1237 #if !defined(HAVE_STRTOULL) && defined(HAVE___STRTOULL)
1238 #define strtoull __strtoull
1239 #define HAVE_STRTOULL 1
1240 #endif
1241 
1242 #if !defined(HAVE_STRTOULL) && defined(HAVE_STRTOUQ)
1243 #define strtoull strtouq
1244 #define HAVE_STRTOULL 1
1245 #endif
1246 
1247 #if defined(HAVE_STRTOLL) && !HAVE_DECL_STRTOLL
1248 extern long long strtoll(const char *str, char **endptr, int base);
1249 #endif
1250 
1251 #if defined(HAVE_STRTOULL) && !HAVE_DECL_STRTOULL
1252 extern unsigned long long strtoull(const char *str, char **endptr, int base);
1253 #endif
1254 
1255 /* no special DLL markers on most ports */
1256 #ifndef PGDLLIMPORT
1257 #define PGDLLIMPORT
1258 #endif
1259 #ifndef PGDLLEXPORT
1260 #define PGDLLEXPORT
1261 #endif
1262 
1263 /*
1264  * The following is used as the arg list for signal handlers. Any ports
1265  * that take something other than an int argument should override this in
1266  * their pg_config_os.h file. Note that variable names are required
1267  * because it is used in both the prototypes as well as the definitions.
1268  * Note also the long name. We expect that this won't collide with
1269  * other names causing compiler warnings.
1270  */
1271 
1272 #ifndef SIGNAL_ARGS
1273 #define SIGNAL_ARGS int postgres_signal_arg
1274 #endif
1275 
1276 /*
1277  * When there is no sigsetjmp, its functionality is provided by plain
1278  * setjmp. Incidentally, nothing provides setjmp's functionality in
1279  * that case. We now support the case only on Windows.
1280  */
1281 #ifdef WIN32
1282 #define sigjmp_buf jmp_buf
1283 #define sigsetjmp(x,y) setjmp(x)
1284 #define siglongjmp longjmp
1285 #endif
1286 
1287 /* EXEC_BACKEND defines */
1288 #ifdef EXEC_BACKEND
1289 #define NON_EXEC_STATIC
1290 #else
1291 #define NON_EXEC_STATIC static
1292 #endif
1293 
1294 /* /port compatibility functions */
1295 #include "port.h"
1296 
1297 #endif /* C_H */
signed short int16
Definition: c.h:361
uint32 CommandId
Definition: c.h:534
int lbound1
Definition: c.h:597
Definition: c.h:601
#define pg_attribute_noreturn()
Definition: c.h:145
uint32 MultiXactOffset
Definition: c.h:532
uint32 TransactionId
Definition: c.h:520
#define MAXDIM
Definition: c.h:542
uint16 bits16
Definition: c.h:382
regproc RegProcedure
Definition: c.h:518
int64 force_align_i64
Definition: c.h:1092
unsigned char uint8
Definition: c.h:372
#define FLEXIBLE_ARRAY_MEMBER
Definition: c.h:283
int32 dataoffset
Definition: c.h:605
Oid elemtype
Definition: c.h:595
uint32 SubTransactionId
Definition: c.h:524
unsigned int Oid
Definition: postgres_ext.h:31
signed int int32
Definition: c.h:362
char vl_len_[4]
Definition: c.h:564
#define NAMEDATALEN
unsigned short uint16
Definition: c.h:373
char * Pointer
Definition: c.h:351
int32 dataoffset
Definition: c.h:594
double float8
Definition: c.h:498
union PGAlignedXLogBlock PGAlignedXLogBlock
union PGAlignedBlock PGAlignedBlock
double force_align_d
Definition: c.h:1091
int32 vl_len_
Definition: c.h:603
Definition: c.h:616
int dim1
Definition: c.h:607
int ndim
Definition: c.h:593
unsigned int uint32
Definition: c.h:374
uint32 LocalTransactionId
Definition: c.h:522
char vl_dat[FLEXIBLE_ARRAY_MEMBER]
Definition: c.h:565
signed char int8
Definition: c.h:360
float float4
Definition: c.h:497
uint8 bits8
Definition: c.h:381
Definition: c.h:590
int dim1
Definition: c.h:596
unsigned int Index
Definition: c.h:482
TransactionId MultiXactId
Definition: c.h:530
uint32 bits32
Definition: c.h:383
int32 vl_len_
Definition: c.h:592
signed int Offset
Definition: c.h:492
size_t Size
Definition: c.h:473
int lbound1
Definition: c.h:608
int64 force_align_i64
Definition: c.h:1084
Oid regproc
Definition: c.h:517
static Datum values[MAXATTR]
Definition: bootstrap.c:165
Definition: c.h:543
Oid elemtype
Definition: c.h:606
double force_align_d
Definition: c.h:1083
struct nameData NameData
void(* pg_funcptr_t)(void)
Definition: c.h:273
Definition: c.h:562
NameData * Name
Definition: c.h:620
int ndim
Definition: c.h:604
void ExceptionalCondition(const char *conditionName, const char *errorType, const char *fileName, int lineNumber) pg_attribute_noreturn()
Definition: assert.c:29
unsigned char bool
Definition: c.h:324