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) 1996-2018, 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 #ifdef HAVE_STDINT_H 68 #include <stdint.h> 69 #endif 70 #include <sys/types.h> 71 #include <errno.h> 72 #if defined(WIN32) || defined(__CYGWIN__) 73 #include <fcntl.h> /* ensure O_BINARY is available */ 74 #endif 75 #include <locale.h> 76 #ifdef ENABLE_NLS 77 #include <libintl.h> 78 #endif 79 80 81 /* ---------------------------------------------------------------- 82 * Section 1: compiler characteristics 83 * 84 * type prefixes (const, signed, volatile, inline) are handled in pg_config.h. 85 * ---------------------------------------------------------------- 86 */ 87 88 /* 89 * Disable "inline" if PG_FORCE_DISABLE_INLINE is defined. 90 * This is used to work around compiler bugs and might also be useful for 91 * investigatory purposes. 92 */ 93 #ifdef PG_FORCE_DISABLE_INLINE 94 #undef inline 95 #define inline 96 #endif 97 98 /* 99 * Attribute macros 100 * 101 * GCC: https://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html 102 * GCC: https://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html 103 * Sunpro: https://docs.oracle.com/cd/E18659_01/html/821-1384/gjzke.html 104 * XLC: http://www-01.ibm.com/support/knowledgecenter/SSGH2K_11.1.0/com.ibm.xlc111.aix.doc/language_ref/function_attributes.html 105 * XLC: http://www-01.ibm.com/support/knowledgecenter/SSGH2K_11.1.0/com.ibm.xlc111.aix.doc/language_ref/type_attrib.html 106 */ 107 108 /* only GCC supports the unused attribute */ 109 #ifdef __GNUC__ 110 #define pg_attribute_unused() __attribute__((unused)) 111 #else 112 #define pg_attribute_unused() 113 #endif 114 115 /* 116 * Place this macro before functions that should be allowed to make misaligned 117 * accesses. Think twice before using it on non-x86-specific code! 118 * Testing can be done with "-fsanitize=alignment -fsanitize-trap=alignment" 119 * on clang, or "-fsanitize=alignment -fno-sanitize-recover=alignment" on gcc. 120 */ 121 #if __clang_major__ >= 7 || __GNUC__ >= 8 122 #define pg_attribute_no_sanitize_alignment() __attribute__((no_sanitize("alignment"))) 123 #else 124 #define pg_attribute_no_sanitize_alignment() 125 #endif 126 127 /* 128 * Append PG_USED_FOR_ASSERTS_ONLY to definitions of variables that are only 129 * used in assert-enabled builds, to avoid compiler warnings about unused 130 * variables in assert-disabled builds. 131 */ 132 #ifdef USE_ASSERT_CHECKING 133 #define PG_USED_FOR_ASSERTS_ONLY 134 #else 135 #define PG_USED_FOR_ASSERTS_ONLY pg_attribute_unused() 136 #endif 137 138 /* GCC and XLC support format attributes */ 139 #if defined(__GNUC__) || defined(__IBMC__) 140 #define pg_attribute_format_arg(a) __attribute__((format_arg(a))) 141 #define pg_attribute_printf(f,a) __attribute__((format(PG_PRINTF_ATTRIBUTE, f, a))) 142 #else 143 #define pg_attribute_format_arg(a) 144 #define pg_attribute_printf(f,a) 145 #endif 146 147 /* GCC, Sunpro and XLC support aligned, packed and noreturn */ 148 #if defined(__GNUC__) || defined(__SUNPRO_C) || defined(__IBMC__) 149 #define pg_attribute_aligned(a) __attribute__((aligned(a))) 150 #define pg_attribute_noreturn() __attribute__((noreturn)) 151 #define pg_attribute_packed() __attribute__((packed)) 152 #define HAVE_PG_ATTRIBUTE_NORETURN 1 153 #else 154 /* 155 * NB: aligned and packed are not given default definitions because they 156 * affect code functionality; they *must* be implemented by the compiler 157 * if they are to be used. 158 */ 159 #define pg_attribute_noreturn() 160 #endif 161 162 /* 163 * Use "pg_attribute_always_inline" in place of "inline" for functions that 164 * we wish to force inlining of, even when the compiler's heuristics would 165 * choose not to. But, if possible, don't force inlining in unoptimized 166 * debug builds. 167 */ 168 #if (defined(__GNUC__) && __GNUC__ > 3 && defined(__OPTIMIZE__)) || defined(__SUNPRO_C) || defined(__IBMC__) 169 /* GCC > 3, Sunpro and XLC support always_inline via __attribute__ */ 170 #define pg_attribute_always_inline __attribute__((always_inline)) inline 171 #elif defined(_MSC_VER) 172 /* MSVC has a special keyword for this */ 173 #define pg_attribute_always_inline __forceinline 174 #else 175 /* Otherwise, the best we can do is to say "inline" */ 176 #define pg_attribute_always_inline inline 177 #endif 178 179 /* 180 * Forcing a function not to be inlined can be useful if it's the slow path of 181 * a performance-critical function, or should be visible in profiles to allow 182 * for proper cost attribution. Note that unlike the pg_attribute_XXX macros 183 * above, this should be placed before the function's return type and name. 184 */ 185 /* GCC, Sunpro and XLC support noinline via __attribute__ */ 186 #if (defined(__GNUC__) && __GNUC__ > 2) || defined(__SUNPRO_C) || defined(__IBMC__) 187 #define pg_noinline __attribute__((noinline)) 188 /* msvc via declspec */ 189 #elif defined(_MSC_VER) 190 #define pg_noinline __declspec(noinline) 191 #else 192 #define pg_noinline 193 #endif 194 195 /* 196 * Mark a point as unreachable in a portable fashion. This should preferably 197 * be something that the compiler understands, to aid code generation. 198 * In assert-enabled builds, we prefer abort() for debugging reasons. 199 */ 200 #if defined(HAVE__BUILTIN_UNREACHABLE) && !defined(USE_ASSERT_CHECKING) 201 #define pg_unreachable() __builtin_unreachable() 202 #elif defined(_MSC_VER) && !defined(USE_ASSERT_CHECKING) 203 #define pg_unreachable() __assume(0) 204 #else 205 #define pg_unreachable() abort() 206 #endif 207 208 /* 209 * Hints to the compiler about the likelihood of a branch. Both likely() and 210 * unlikely() return the boolean value of the contained expression. 211 * 212 * These should only be used sparingly, in very hot code paths. It's very easy 213 * to mis-estimate likelihoods. 214 */ 215 #if __GNUC__ >= 3 216 #define likely(x) __builtin_expect((x) != 0, 1) 217 #define unlikely(x) __builtin_expect((x) != 0, 0) 218 #else 219 #define likely(x) ((x) != 0) 220 #define unlikely(x) ((x) != 0) 221 #endif 222 223 /* 224 * CppAsString 225 * Convert the argument to a string, using the C preprocessor. 226 * CppAsString2 227 * Convert the argument to a string, after one round of macro expansion. 228 * CppConcat 229 * Concatenate two arguments together, using the C preprocessor. 230 * 231 * Note: There used to be support here for pre-ANSI C compilers that didn't 232 * support # and ##. Nowadays, these macros are just for clarity and/or 233 * backward compatibility with existing PostgreSQL code. 234 */ 235 #define CppAsString(identifier) #identifier 236 #define CppAsString2(x) CppAsString(x) 237 #define CppConcat(x, y) x##y 238 239 /* 240 * dummyret is used to set return values in macros that use ?: to make 241 * assignments. gcc wants these to be void, other compilers like char 242 */ 243 #ifdef __GNUC__ /* GNU cc */ 244 #define dummyret void 245 #else 246 #define dummyret char 247 #endif 248 249 /* Which __func__ symbol do we have, if any? */ 250 #ifdef HAVE_FUNCNAME__FUNC 251 #define PG_FUNCNAME_MACRO __func__ 252 #else 253 #ifdef HAVE_FUNCNAME__FUNCTION 254 #define PG_FUNCNAME_MACRO __FUNCTION__ 255 #else 256 #define PG_FUNCNAME_MACRO NULL 257 #endif 258 #endif 259 260 261 /* ---------------------------------------------------------------- 262 * Section 2: bool, true, false 263 * ---------------------------------------------------------------- 264 */ 265 266 /* 267 * bool 268 * Boolean value, either true or false. 269 * 270 * Use stdbool.h if available and its bool has size 1. That's useful for 271 * better compiler and debugger output and for compatibility with third-party 272 * libraries. But PostgreSQL currently cannot deal with bool of other sizes; 273 * there are static assertions around the code to prevent that. 274 * 275 * For C++ compilers, we assume the compiler has a compatible built-in 276 * definition of bool. 277 */ 278 279 #ifndef __cplusplus 280 281 #if defined(HAVE_STDBOOL_H) && SIZEOF_BOOL == 1 282 #include <stdbool.h> 283 #define USE_STDBOOL 1 284 #else 285 286 #ifndef bool 287 typedef char bool; 288 #endif 289 290 #ifndef true 291 #define true ((bool) 1) 292 #endif 293 294 #ifndef false 295 #define false ((bool) 0) 296 #endif 297 298 #endif 299 #endif /* not C++ */ 300 301 302 /* ---------------------------------------------------------------- 303 * Section 3: standard system types 304 * ---------------------------------------------------------------- 305 */ 306 307 /* 308 * Pointer 309 * Variable holding address of any memory resident object. 310 * 311 * XXX Pointer arithmetic is done with this, so it can't be void * 312 * under "true" ANSI compilers. 313 */ 314 typedef char *Pointer; 315 316 /* 317 * intN 318 * Signed integer, EXACTLY N BITS IN SIZE, 319 * used for numerical computations and the 320 * frontend/backend protocol. 321 */ 322 #ifndef HAVE_INT8 323 typedef signed char int8; /* == 8 bits */ 324 typedef signed short int16; /* == 16 bits */ 325 typedef signed int int32; /* == 32 bits */ 326 #endif /* not HAVE_INT8 */ 327 328 /* 329 * uintN 330 * Unsigned integer, EXACTLY N BITS IN SIZE, 331 * used for numerical computations and the 332 * frontend/backend protocol. 333 */ 334 #ifndef HAVE_UINT8 335 typedef unsigned char uint8; /* == 8 bits */ 336 typedef unsigned short uint16; /* == 16 bits */ 337 typedef unsigned int uint32; /* == 32 bits */ 338 #endif /* not HAVE_UINT8 */ 339 340 /* 341 * bitsN 342 * Unit of bitwise operation, AT LEAST N BITS IN SIZE. 343 */ 344 typedef uint8 bits8; /* >= 8 bits */ 345 typedef uint16 bits16; /* >= 16 bits */ 346 typedef uint32 bits32; /* >= 32 bits */ 347 348 /* 349 * 64-bit integers 350 */ 351 #ifdef HAVE_LONG_INT_64 352 /* Plain "long int" fits, use it */ 353 354 #ifndef HAVE_INT64 355 typedef long int int64; 356 #endif 357 #ifndef HAVE_UINT64 358 typedef unsigned long int uint64; 359 #endif 360 #define INT64CONST(x) (x##L) 361 #define UINT64CONST(x) (x##UL) 362 #elif defined(HAVE_LONG_LONG_INT_64) 363 /* We have working support for "long long int", use that */ 364 365 #ifndef HAVE_INT64 366 typedef long long int int64; 367 #endif 368 #ifndef HAVE_UINT64 369 typedef unsigned long long int uint64; 370 #endif 371 #define INT64CONST(x) (x##LL) 372 #define UINT64CONST(x) (x##ULL) 373 #else 374 /* neither HAVE_LONG_INT_64 nor HAVE_LONG_LONG_INT_64 */ 375 #error must have a working 64-bit integer datatype 376 #endif 377 378 /* snprintf format strings to use for 64-bit integers */ 379 #define INT64_FORMAT "%" INT64_MODIFIER "d" 380 #define UINT64_FORMAT "%" INT64_MODIFIER "u" 381 382 /* 383 * 128-bit signed and unsigned integers 384 * There currently is only limited support for such types. 385 * E.g. 128bit literals and snprintf are not supported; but math is. 386 * Also, because we exclude such types when choosing MAXIMUM_ALIGNOF, 387 * it must be possible to coerce the compiler to allocate them on no 388 * more than MAXALIGN boundaries. 389 */ 390 #if defined(PG_INT128_TYPE) 391 #if defined(pg_attribute_aligned) || ALIGNOF_PG_INT128_TYPE <= MAXIMUM_ALIGNOF 392 #define HAVE_INT128 1 393 394 typedef PG_INT128_TYPE int128 395 #if defined(pg_attribute_aligned) 396 pg_attribute_aligned(MAXIMUM_ALIGNOF) 397 #endif 398 ; 399 400 typedef unsigned PG_INT128_TYPE uint128 401 #if defined(pg_attribute_aligned) 402 pg_attribute_aligned(MAXIMUM_ALIGNOF) 403 #endif 404 ; 405 406 #endif 407 #endif 408 409 /* 410 * stdint.h limits aren't guaranteed to be present and aren't guaranteed to 411 * have compatible types with our fixed width types. So just define our own. 412 */ 413 #define PG_INT8_MIN (-0x7F-1) 414 #define PG_INT8_MAX (0x7F) 415 #define PG_UINT8_MAX (0xFF) 416 #define PG_INT16_MIN (-0x7FFF-1) 417 #define PG_INT16_MAX (0x7FFF) 418 #define PG_UINT16_MAX (0xFFFF) 419 #define PG_INT32_MIN (-0x7FFFFFFF-1) 420 #define PG_INT32_MAX (0x7FFFFFFF) 421 #define PG_UINT32_MAX (0xFFFFFFFFU) 422 #define PG_INT64_MIN (-INT64CONST(0x7FFFFFFFFFFFFFFF) - 1) 423 #define PG_INT64_MAX INT64CONST(0x7FFFFFFFFFFFFFFF) 424 #define PG_UINT64_MAX UINT64CONST(0xFFFFFFFFFFFFFFFF) 425 426 /* Max value of size_t might also be missing if we don't have stdint.h */ 427 #ifndef SIZE_MAX 428 #if SIZEOF_SIZE_T == 8 429 #define SIZE_MAX PG_UINT64_MAX 430 #else 431 #define SIZE_MAX PG_UINT32_MAX 432 #endif 433 #endif 434 435 /* 436 * We now always use int64 timestamps, but keep this symbol defined for the 437 * benefit of external code that might test it. 438 */ 439 #define HAVE_INT64_TIMESTAMP 440 441 /* 442 * Size 443 * Size of any memory resident object, as returned by sizeof. 444 */ 445 typedef size_t Size; 446 447 /* 448 * Index 449 * Index into any memory resident array. 450 * 451 * Note: 452 * Indices are non negative. 453 */ 454 typedef unsigned int Index; 455 456 /* 457 * Offset 458 * Offset into any memory resident array. 459 * 460 * Note: 461 * This differs from an Index in that an Index is always 462 * non negative, whereas Offset may be negative. 463 */ 464 typedef signed int Offset; 465 466 /* 467 * Common Postgres datatype names (as used in the catalogs) 468 */ 469 typedef float float4; 470 typedef double float8; 471 472 /* 473 * Oid, RegProcedure, TransactionId, SubTransactionId, MultiXactId, 474 * CommandId 475 */ 476 477 /* typedef Oid is in postgres_ext.h */ 478 479 /* 480 * regproc is the type name used in the include/catalog headers, but 481 * RegProcedure is the preferred name in C code. 482 */ 483 typedef Oid regproc; 484 typedef regproc RegProcedure; 485 486 typedef uint32 TransactionId; 487 488 typedef uint32 LocalTransactionId; 489 490 typedef uint32 SubTransactionId; 491 492 #define InvalidSubTransactionId ((SubTransactionId) 0) 493 #define TopSubTransactionId ((SubTransactionId) 1) 494 495 /* MultiXactId must be equivalent to TransactionId, to fit in t_xmax */ 496 typedef TransactionId MultiXactId; 497 498 typedef uint32 MultiXactOffset; 499 500 typedef uint32 CommandId; 501 502 #define FirstCommandId ((CommandId) 0) 503 #define InvalidCommandId (~(CommandId)0) 504 505 /* 506 * Array indexing support 507 */ 508 #define MAXDIM 6 509 typedef struct 510 { 511 int indx[MAXDIM]; 512 } IntArray; 513 514 /* ---------------- 515 * Variable-length datatypes all share the 'struct varlena' header. 516 * 517 * NOTE: for TOASTable types, this is an oversimplification, since the value 518 * may be compressed or moved out-of-line. However datatype-specific routines 519 * are mostly content to deal with de-TOASTed values only, and of course 520 * client-side routines should never see a TOASTed value. But even in a 521 * de-TOASTed value, beware of touching vl_len_ directly, as its 522 * representation is no longer convenient. It's recommended that code always 523 * use macros VARDATA_ANY, VARSIZE_ANY, VARSIZE_ANY_EXHDR, VARDATA, VARSIZE, 524 * and SET_VARSIZE instead of relying on direct mentions of the struct fields. 525 * See postgres.h for details of the TOASTed form. 526 * ---------------- 527 */ 528 struct varlena 529 { 530 char vl_len_[4]; /* Do not touch this field directly! */ 531 char vl_dat[FLEXIBLE_ARRAY_MEMBER]; /* Data content is here */ 532 }; 533 534 #define VARHDRSZ ((int32) sizeof(int32)) 535 536 /* 537 * These widely-used datatypes are just a varlena header and the data bytes. 538 * There is no terminating null or anything like that --- the data length is 539 * always VARSIZE_ANY_EXHDR(ptr). 540 */ 541 typedef struct varlena bytea; 542 typedef struct varlena text; 543 typedef struct varlena BpChar; /* blank-padded char, ie SQL char(n) */ 544 typedef struct varlena VarChar; /* var-length char, ie SQL varchar(n) */ 545 546 /* 547 * Specialized array types. These are physically laid out just the same 548 * as regular arrays (so that the regular array subscripting code works 549 * with them). They exist as distinct types mostly for historical reasons: 550 * they have nonstandard I/O behavior which we don't want to change for fear 551 * of breaking applications that look at the system catalogs. There is also 552 * an implementation issue for oidvector: it's part of the primary key for 553 * pg_proc, and we can't use the normal btree array support routines for that 554 * without circularity. 555 */ 556 typedef struct 557 { 558 int32 vl_len_; /* these fields must match ArrayType! */ 559 int ndim; /* always 1 for int2vector */ 560 int32 dataoffset; /* always 0 for int2vector */ 561 Oid elemtype; 562 int dim1; 563 int lbound1; 564 int16 values[FLEXIBLE_ARRAY_MEMBER]; 565 } int2vector; 566 567 typedef struct 568 { 569 int32 vl_len_; /* these fields must match ArrayType! */ 570 int ndim; /* always 1 for oidvector */ 571 int32 dataoffset; /* always 0 for oidvector */ 572 Oid elemtype; 573 int dim1; 574 int lbound1; 575 Oid values[FLEXIBLE_ARRAY_MEMBER]; 576 } oidvector; 577 578 /* 579 * Representation of a Name: effectively just a C string, but null-padded to 580 * exactly NAMEDATALEN bytes. The use of a struct is historical. 581 */ 582 typedef struct nameData 583 { 584 char data[NAMEDATALEN]; 585 } NameData; 586 typedef NameData *Name; 587 588 #define NameStr(name) ((name).data) 589 590 591 /* ---------------------------------------------------------------- 592 * Section 4: IsValid macros for system types 593 * ---------------------------------------------------------------- 594 */ 595 /* 596 * BoolIsValid 597 * True iff bool is valid. 598 */ 599 #define BoolIsValid(boolean) ((boolean) == false || (boolean) == true) 600 601 /* 602 * PointerIsValid 603 * True iff pointer is valid. 604 */ 605 #define PointerIsValid(pointer) ((const void*)(pointer) != NULL) 606 607 /* 608 * PointerIsAligned 609 * True iff pointer is properly aligned to point to the given type. 610 */ 611 #define PointerIsAligned(pointer, type) \ 612 (((uintptr_t)(pointer) % (sizeof (type))) == 0) 613 614 #define OffsetToPointer(base, offset) \ 615 ((void *)((char *) base + offset)) 616 617 #define OidIsValid(objectId) ((bool) ((objectId) != InvalidOid)) 618 619 #define RegProcedureIsValid(p) OidIsValid(p) 620 621 622 /* ---------------------------------------------------------------- 623 * Section 5: offsetof, lengthof, alignment 624 * ---------------------------------------------------------------- 625 */ 626 /* 627 * offsetof 628 * Offset of a structure/union field within that structure/union. 629 * 630 * XXX This is supposed to be part of stddef.h, but isn't on 631 * some systems (like SunOS 4). 632 */ 633 #ifndef offsetof 634 #define offsetof(type, field) ((long) &((type *)0)->field) 635 #endif /* offsetof */ 636 637 /* 638 * lengthof 639 * Number of elements in an array. 640 */ 641 #define lengthof(array) (sizeof (array) / sizeof ((array)[0])) 642 643 /* ---------------- 644 * Alignment macros: align a length or address appropriately for a given type. 645 * The fooALIGN() macros round up to a multiple of the required alignment, 646 * while the fooALIGN_DOWN() macros round down. The latter are more useful 647 * for problems like "how many X-sized structures will fit in a page?". 648 * 649 * NOTE: TYPEALIGN[_DOWN] will not work if ALIGNVAL is not a power of 2. 650 * That case seems extremely unlikely to be needed in practice, however. 651 * 652 * NOTE: MAXIMUM_ALIGNOF, and hence MAXALIGN(), intentionally exclude any 653 * larger-than-8-byte types the compiler might have. 654 * ---------------- 655 */ 656 657 #define TYPEALIGN(ALIGNVAL,LEN) \ 658 (((uintptr_t) (LEN) + ((ALIGNVAL) - 1)) & ~((uintptr_t) ((ALIGNVAL) - 1))) 659 660 #define SHORTALIGN(LEN) TYPEALIGN(ALIGNOF_SHORT, (LEN)) 661 #define INTALIGN(LEN) TYPEALIGN(ALIGNOF_INT, (LEN)) 662 #define LONGALIGN(LEN) TYPEALIGN(ALIGNOF_LONG, (LEN)) 663 #define DOUBLEALIGN(LEN) TYPEALIGN(ALIGNOF_DOUBLE, (LEN)) 664 #define MAXALIGN(LEN) TYPEALIGN(MAXIMUM_ALIGNOF, (LEN)) 665 /* MAXALIGN covers only built-in types, not buffers */ 666 #define BUFFERALIGN(LEN) TYPEALIGN(ALIGNOF_BUFFER, (LEN)) 667 #define CACHELINEALIGN(LEN) TYPEALIGN(PG_CACHE_LINE_SIZE, (LEN)) 668 669 #define TYPEALIGN_DOWN(ALIGNVAL,LEN) \ 670 (((uintptr_t) (LEN)) & ~((uintptr_t) ((ALIGNVAL) - 1))) 671 672 #define SHORTALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_SHORT, (LEN)) 673 #define INTALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_INT, (LEN)) 674 #define LONGALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_LONG, (LEN)) 675 #define DOUBLEALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_DOUBLE, (LEN)) 676 #define MAXALIGN_DOWN(LEN) TYPEALIGN_DOWN(MAXIMUM_ALIGNOF, (LEN)) 677 #define BUFFERALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_BUFFER, (LEN)) 678 679 /* 680 * The above macros will not work with types wider than uintptr_t, like with 681 * uint64 on 32-bit platforms. That's not problem for the usual use where a 682 * pointer or a length is aligned, but for the odd case that you need to 683 * align something (potentially) wider, use TYPEALIGN64. 684 */ 685 #define TYPEALIGN64(ALIGNVAL,LEN) \ 686 (((uint64) (LEN) + ((ALIGNVAL) - 1)) & ~((uint64) ((ALIGNVAL) - 1))) 687 688 /* we don't currently need wider versions of the other ALIGN macros */ 689 #define MAXALIGN64(LEN) TYPEALIGN64(MAXIMUM_ALIGNOF, (LEN)) 690 691 692 /* ---------------------------------------------------------------- 693 * Section 6: assertions 694 * ---------------------------------------------------------------- 695 */ 696 697 /* 698 * USE_ASSERT_CHECKING, if defined, turns on all the assertions. 699 * - plai 9/5/90 700 * 701 * It should _NOT_ be defined in releases or in benchmark copies 702 */ 703 704 /* 705 * Assert() can be used in both frontend and backend code. In frontend code it 706 * just calls the standard assert, if it's available. If use of assertions is 707 * not configured, it does nothing. 708 */ 709 #ifndef USE_ASSERT_CHECKING 710 711 #define Assert(condition) ((void)true) 712 #define AssertMacro(condition) ((void)true) 713 #define AssertArg(condition) ((void)true) 714 #define AssertState(condition) ((void)true) 715 #define AssertPointerAlignment(ptr, bndr) ((void)true) 716 #define Trap(condition, errorType) ((void)true) 717 #define TrapMacro(condition, errorType) (true) 718 719 #elif defined(FRONTEND) 720 721 #include <assert.h> 722 #define Assert(p) assert(p) 723 #define AssertMacro(p) ((void) assert(p)) 724 #define AssertArg(condition) assert(condition) 725 #define AssertState(condition) assert(condition) 726 #define AssertPointerAlignment(ptr, bndr) ((void)true) 727 728 #else /* USE_ASSERT_CHECKING && !FRONTEND */ 729 730 /* 731 * Trap 732 * Generates an exception if the given condition is true. 733 */ 734 #define Trap(condition, errorType) \ 735 do { \ 736 if (condition) \ 737 ExceptionalCondition(CppAsString(condition), (errorType), \ 738 __FILE__, __LINE__); \ 739 } while (0) 740 741 /* 742 * TrapMacro is the same as Trap but it's intended for use in macros: 743 * 744 * #define foo(x) (AssertMacro(x != 0), bar(x)) 745 * 746 * Isn't CPP fun? 747 */ 748 #define TrapMacro(condition, errorType) \ 749 ((bool) (! (condition) || \ 750 (ExceptionalCondition(CppAsString(condition), (errorType), \ 751 __FILE__, __LINE__), 0))) 752 753 #define Assert(condition) \ 754 Trap(!(condition), "FailedAssertion") 755 756 #define AssertMacro(condition) \ 757 ((void) TrapMacro(!(condition), "FailedAssertion")) 758 759 #define AssertArg(condition) \ 760 Trap(!(condition), "BadArgument") 761 762 #define AssertState(condition) \ 763 Trap(!(condition), "BadState") 764 765 /* 766 * Check that `ptr' is `bndr' aligned. 767 */ 768 #define AssertPointerAlignment(ptr, bndr) \ 769 Trap(TYPEALIGN(bndr, (uintptr_t)(ptr)) != (uintptr_t)(ptr), \ 770 "UnalignedPointer") 771 772 #endif /* USE_ASSERT_CHECKING && !FRONTEND */ 773 774 /* 775 * ExceptionalCondition is compiled into the backend whether or not 776 * USE_ASSERT_CHECKING is defined, so as to support use of extensions 777 * that are built with that #define with a backend that isn't. Hence, 778 * we should declare it as long as !FRONTEND. 779 */ 780 #ifndef FRONTEND 781 extern void ExceptionalCondition(const char *conditionName, 782 const char *errorType, 783 const char *fileName, int lineNumber) pg_attribute_noreturn(); 784 #endif 785 786 /* 787 * Macros to support compile-time assertion checks. 788 * 789 * If the "condition" (a compile-time-constant expression) evaluates to false, 790 * throw a compile error using the "errmessage" (a string literal). 791 * 792 * gcc 4.6 and up supports _Static_assert(), but there are bizarre syntactic 793 * placement restrictions. These macros make it safe to use as a statement 794 * or in an expression, respectively. 795 * 796 * Otherwise we fall back on a kluge that assumes the compiler will complain 797 * about a negative width for a struct bit-field. This will not include a 798 * helpful error message, but it beats not getting an error at all. 799 */ 800 #ifndef __cplusplus 801 #ifdef HAVE__STATIC_ASSERT 802 #define StaticAssertStmt(condition, errmessage) \ 803 do { _Static_assert(condition, errmessage); } while(0) 804 #define StaticAssertExpr(condition, errmessage) \ 805 ((void) ({ StaticAssertStmt(condition, errmessage); true; })) 806 #else /* !HAVE__STATIC_ASSERT */ 807 #define StaticAssertStmt(condition, errmessage) \ 808 ((void) sizeof(struct { int static_assert_failure : (condition) ? 1 : -1; })) 809 #define StaticAssertExpr(condition, errmessage) \ 810 StaticAssertStmt(condition, errmessage) 811 #endif /* HAVE__STATIC_ASSERT */ 812 #else /* C++ */ 813 #if defined(__cpp_static_assert) && __cpp_static_assert >= 200410 814 #define StaticAssertStmt(condition, errmessage) \ 815 static_assert(condition, errmessage) 816 #define StaticAssertExpr(condition, errmessage) \ 817 ({ static_assert(condition, errmessage); }) 818 #else 819 #define StaticAssertStmt(condition, errmessage) \ 820 do { struct static_assert_struct { int static_assert_failure : (condition) ? 1 : -1; }; } while(0) 821 #define StaticAssertExpr(condition, errmessage) \ 822 ((void) ({ StaticAssertStmt(condition, errmessage); })) 823 #endif 824 #endif /* C++ */ 825 826 827 /* 828 * Compile-time checks that a variable (or expression) has the specified type. 829 * 830 * AssertVariableIsOfType() can be used as a statement. 831 * AssertVariableIsOfTypeMacro() is intended for use in macros, eg 832 * #define foo(x) (AssertVariableIsOfTypeMacro(x, int), bar(x)) 833 * 834 * If we don't have __builtin_types_compatible_p, we can still assert that 835 * the types have the same size. This is far from ideal (especially on 32-bit 836 * platforms) but it provides at least some coverage. 837 */ 838 #ifdef HAVE__BUILTIN_TYPES_COMPATIBLE_P 839 #define AssertVariableIsOfType(varname, typename) \ 840 StaticAssertStmt(__builtin_types_compatible_p(__typeof__(varname), typename), \ 841 CppAsString(varname) " does not have type " CppAsString(typename)) 842 #define AssertVariableIsOfTypeMacro(varname, typename) \ 843 (StaticAssertExpr(__builtin_types_compatible_p(__typeof__(varname), typename), \ 844 CppAsString(varname) " does not have type " CppAsString(typename))) 845 #else /* !HAVE__BUILTIN_TYPES_COMPATIBLE_P */ 846 #define AssertVariableIsOfType(varname, typename) \ 847 StaticAssertStmt(sizeof(varname) == sizeof(typename), \ 848 CppAsString(varname) " does not have type " CppAsString(typename)) 849 #define AssertVariableIsOfTypeMacro(varname, typename) \ 850 (StaticAssertExpr(sizeof(varname) == sizeof(typename), \ 851 CppAsString(varname) " does not have type " CppAsString(typename))) 852 #endif /* HAVE__BUILTIN_TYPES_COMPATIBLE_P */ 853 854 855 /* ---------------------------------------------------------------- 856 * Section 7: widely useful macros 857 * ---------------------------------------------------------------- 858 */ 859 /* 860 * Max 861 * Return the maximum of two numbers. 862 */ 863 #define Max(x, y) ((x) > (y) ? (x) : (y)) 864 865 /* 866 * Min 867 * Return the minimum of two numbers. 868 */ 869 #define Min(x, y) ((x) < (y) ? (x) : (y)) 870 871 /* 872 * Abs 873 * Return the absolute value of the argument. 874 */ 875 #define Abs(x) ((x) >= 0 ? (x) : -(x)) 876 877 /* 878 * StrNCpy 879 * Like standard library function strncpy(), except that result string 880 * is guaranteed to be null-terminated --- that is, at most N-1 bytes 881 * of the source string will be kept. 882 * Also, the macro returns no result (too hard to do that without 883 * evaluating the arguments multiple times, which seems worse). 884 * 885 * BTW: when you need to copy a non-null-terminated string (like a text 886 * datum) and add a null, do not do it with StrNCpy(..., len+1). That 887 * might seem to work, but it fetches one byte more than there is in the 888 * text object. One fine day you'll have a SIGSEGV because there isn't 889 * another byte before the end of memory. Don't laugh, we've had real 890 * live bug reports from real live users over exactly this mistake. 891 * Do it honestly with "memcpy(dst,src,len); dst[len] = '\0';", instead. 892 */ 893 #define StrNCpy(dst,src,len) \ 894 do \ 895 { \ 896 char * _dst = (dst); \ 897 Size _len = (len); \ 898 \ 899 if (_len > 0) \ 900 { \ 901 strncpy(_dst, (src), _len); \ 902 _dst[_len-1] = '\0'; \ 903 } \ 904 } while (0) 905 906 907 /* Get a bit mask of the bits set in non-long aligned addresses */ 908 #define LONG_ALIGN_MASK (sizeof(long) - 1) 909 910 /* 911 * MemSet 912 * Exactly the same as standard library function memset(), but considerably 913 * faster for zeroing small word-aligned structures (such as parsetree nodes). 914 * This has to be a macro because the main point is to avoid function-call 915 * overhead. However, we have also found that the loop is faster than 916 * native libc memset() on some platforms, even those with assembler 917 * memset() functions. More research needs to be done, perhaps with 918 * MEMSET_LOOP_LIMIT tests in configure. 919 */ 920 #define MemSet(start, val, len) \ 921 do \ 922 { \ 923 /* must be void* because we don't know if it is integer aligned yet */ \ 924 void *_vstart = (void *) (start); \ 925 int _val = (val); \ 926 Size _len = (len); \ 927 \ 928 if ((((uintptr_t) _vstart) & LONG_ALIGN_MASK) == 0 && \ 929 (_len & LONG_ALIGN_MASK) == 0 && \ 930 _val == 0 && \ 931 _len <= MEMSET_LOOP_LIMIT && \ 932 /* \ 933 * If MEMSET_LOOP_LIMIT == 0, optimizer should find \ 934 * the whole "if" false at compile time. \ 935 */ \ 936 MEMSET_LOOP_LIMIT != 0) \ 937 { \ 938 long *_start = (long *) _vstart; \ 939 long *_stop = (long *) ((char *) _start + _len); \ 940 while (_start < _stop) \ 941 *_start++ = 0; \ 942 } \ 943 else \ 944 memset(_vstart, _val, _len); \ 945 } while (0) 946 947 /* 948 * MemSetAligned is the same as MemSet except it omits the test to see if 949 * "start" is word-aligned. This is okay to use if the caller knows a-priori 950 * that the pointer is suitably aligned (typically, because he just got it 951 * from palloc(), which always delivers a max-aligned pointer). 952 */ 953 #define MemSetAligned(start, val, len) \ 954 do \ 955 { \ 956 long *_start = (long *) (start); \ 957 int _val = (val); \ 958 Size _len = (len); \ 959 \ 960 if ((_len & LONG_ALIGN_MASK) == 0 && \ 961 _val == 0 && \ 962 _len <= MEMSET_LOOP_LIMIT && \ 963 MEMSET_LOOP_LIMIT != 0) \ 964 { \ 965 long *_stop = (long *) ((char *) _start + _len); \ 966 while (_start < _stop) \ 967 *_start++ = 0; \ 968 } \ 969 else \ 970 memset(_start, _val, _len); \ 971 } while (0) 972 973 974 /* 975 * MemSetTest/MemSetLoop are a variant version that allow all the tests in 976 * MemSet to be done at compile time in cases where "val" and "len" are 977 * constants *and* we know the "start" pointer must be word-aligned. 978 * If MemSetTest succeeds, then it is okay to use MemSetLoop, otherwise use 979 * MemSetAligned. Beware of multiple evaluations of the arguments when using 980 * this approach. 981 */ 982 #define MemSetTest(val, len) \ 983 ( ((len) & LONG_ALIGN_MASK) == 0 && \ 984 (len) <= MEMSET_LOOP_LIMIT && \ 985 MEMSET_LOOP_LIMIT != 0 && \ 986 (val) == 0 ) 987 988 #define MemSetLoop(start, val, len) \ 989 do \ 990 { \ 991 long * _start = (long *) (start); \ 992 long * _stop = (long *) ((char *) _start + (Size) (len)); \ 993 \ 994 while (_start < _stop) \ 995 *_start++ = 0; \ 996 } while (0) 997 998 /* 999 * Macros for range-checking float values before converting to integer. 1000 * We must be careful here that the boundary values are expressed exactly 1001 * in the float domain. PG_INTnn_MIN is an exact power of 2, so it will 1002 * be represented exactly; but PG_INTnn_MAX isn't, and might get rounded 1003 * off, so avoid using that. 1004 * The input must be rounded to an integer beforehand, typically with rint(), 1005 * else we might draw the wrong conclusion about close-to-the-limit values. 1006 * These macros will do the right thing for Inf, but not necessarily for NaN, 1007 * so check isnan(num) first if that's a possibility. 1008 */ 1009 #define FLOAT4_FITS_IN_INT16(num) \ 1010 ((num) >= (float4) PG_INT16_MIN && (num) < -((float4) PG_INT16_MIN)) 1011 #define FLOAT4_FITS_IN_INT32(num) \ 1012 ((num) >= (float4) PG_INT32_MIN && (num) < -((float4) PG_INT32_MIN)) 1013 #define FLOAT4_FITS_IN_INT64(num) \ 1014 ((num) >= (float4) PG_INT64_MIN && (num) < -((float4) PG_INT64_MIN)) 1015 #define FLOAT8_FITS_IN_INT16(num) \ 1016 ((num) >= (float8) PG_INT16_MIN && (num) < -((float8) PG_INT16_MIN)) 1017 #define FLOAT8_FITS_IN_INT32(num) \ 1018 ((num) >= (float8) PG_INT32_MIN && (num) < -((float8) PG_INT32_MIN)) 1019 #define FLOAT8_FITS_IN_INT64(num) \ 1020 ((num) >= (float8) PG_INT64_MIN && (num) < -((float8) PG_INT64_MIN)) 1021 1022 1023 /* ---------------------------------------------------------------- 1024 * Section 8: random stuff 1025 * ---------------------------------------------------------------- 1026 */ 1027 1028 /* 1029 * Invert the sign of a qsort-style comparison result, ie, exchange negative 1030 * and positive integer values, being careful not to get the wrong answer 1031 * for INT_MIN. The argument should be an integral variable. 1032 */ 1033 #define INVERT_COMPARE_RESULT(var) \ 1034 ((var) = ((var) < 0) ? 1 : -(var)) 1035 1036 /* 1037 * Use this, not "char buf[BLCKSZ]", to declare a field or local variable 1038 * holding a page buffer, if that page might be accessed as a page and not 1039 * just a string of bytes. Otherwise the variable might be under-aligned, 1040 * causing problems on alignment-picky hardware. (In some places, we use 1041 * this to declare buffers even though we only pass them to read() and 1042 * write(), because copying to/from aligned buffers is usually faster than 1043 * using unaligned buffers.) We include both "double" and "int64" in the 1044 * union to ensure that the compiler knows the value must be MAXALIGN'ed 1045 * (cf. configure's computation of MAXIMUM_ALIGNOF). 1046 */ 1047 typedef union PGAlignedBlock 1048 { 1049 char data[BLCKSZ]; 1050 double force_align_d; 1051 int64 force_align_i64; 1052 } PGAlignedBlock; 1053 1054 /* Same, but for an XLOG_BLCKSZ-sized buffer */ 1055 typedef union PGAlignedXLogBlock 1056 { 1057 char data[XLOG_BLCKSZ]; 1058 double force_align_d; 1059 int64 force_align_i64; 1060 } PGAlignedXLogBlock; 1061 1062 /* msb for char */ 1063 #define HIGHBIT (0x80) 1064 #define IS_HIGHBIT_SET(ch) ((unsigned char)(ch) & HIGHBIT) 1065 1066 /* 1067 * Support macros for escaping strings. escape_backslash should be true 1068 * if generating a non-standard-conforming string. Prefixing a string 1069 * with ESCAPE_STRING_SYNTAX guarantees it is non-standard-conforming. 1070 * Beware of multiple evaluation of the "ch" argument! 1071 */ 1072 #define SQL_STR_DOUBLE(ch, escape_backslash) \ 1073 ((ch) == '\'' || ((ch) == '\\' && (escape_backslash))) 1074 1075 #define ESCAPE_STRING_SYNTAX 'E' 1076 1077 1078 #define STATUS_OK (0) 1079 #define STATUS_ERROR (-1) 1080 #define STATUS_EOF (-2) 1081 #define STATUS_FOUND (1) 1082 #define STATUS_WAITING (2) 1083 1084 /* 1085 * gettext support 1086 */ 1087 1088 #ifndef ENABLE_NLS 1089 /* stuff we'd otherwise get from <libintl.h> */ 1090 #define gettext(x) (x) 1091 #define dgettext(d,x) (x) 1092 #define ngettext(s,p,n) ((n) == 1 ? (s) : (p)) 1093 #define dngettext(d,s,p,n) ((n) == 1 ? (s) : (p)) 1094 #endif 1095 1096 #define _(x) gettext(x) 1097 1098 /* 1099 * Use this to mark string constants as needing translation at some later 1100 * time, rather than immediately. This is useful for cases where you need 1101 * access to the original string and translated string, and for cases where 1102 * immediate translation is not possible, like when initializing global 1103 * variables. 1104 * http://www.gnu.org/software/autoconf/manual/gettext/Special-cases.html 1105 */ 1106 #define gettext_noop(x) (x) 1107 1108 /* 1109 * To better support parallel installations of major PostgreSQL 1110 * versions as well as parallel installations of major library soname 1111 * versions, we mangle the gettext domain name by appending those 1112 * version numbers. The coding rule ought to be that wherever the 1113 * domain name is mentioned as a literal, it must be wrapped into 1114 * PG_TEXTDOMAIN(). The macros below do not work on non-literals; but 1115 * that is somewhat intentional because it avoids having to worry 1116 * about multiple states of premangling and postmangling as the values 1117 * are being passed around. 1118 * 1119 * Make sure this matches the installation rules in nls-global.mk. 1120 */ 1121 #ifdef SO_MAJOR_VERSION 1122 #define PG_TEXTDOMAIN(domain) (domain CppAsString2(SO_MAJOR_VERSION) "-" PG_MAJORVERSION) 1123 #else 1124 #define PG_TEXTDOMAIN(domain) (domain "-" PG_MAJORVERSION) 1125 #endif 1126 1127 1128 /* ---------------------------------------------------------------- 1129 * Section 9: system-specific hacks 1130 * 1131 * This should be limited to things that absolutely have to be 1132 * included in every source file. The port-specific header file 1133 * is usually a better place for this sort of thing. 1134 * ---------------------------------------------------------------- 1135 */ 1136 1137 /* 1138 * NOTE: this is also used for opening text files. 1139 * WIN32 treats Control-Z as EOF in files opened in text mode. 1140 * Therefore, we open files in binary mode on Win32 so we can read 1141 * literal control-Z. The other affect is that we see CRLF, but 1142 * that is OK because we can already handle those cleanly. 1143 */ 1144 #if defined(WIN32) || defined(__CYGWIN__) 1145 #define PG_BINARY O_BINARY 1146 #define PG_BINARY_A "ab" 1147 #define PG_BINARY_R "rb" 1148 #define PG_BINARY_W "wb" 1149 #else 1150 #define PG_BINARY 0 1151 #define PG_BINARY_A "a" 1152 #define PG_BINARY_R "r" 1153 #define PG_BINARY_W "w" 1154 #endif 1155 1156 /* 1157 * Provide prototypes for routines not present in a particular machine's 1158 * standard C library. 1159 */ 1160 1161 #if !HAVE_DECL_SNPRINTF 1162 extern int snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3, 4); 1163 #endif 1164 1165 #if !HAVE_DECL_VSNPRINTF 1166 extern int vsnprintf(char *str, size_t count, const char *fmt, va_list args); 1167 #endif 1168 1169 #if defined(HAVE_FDATASYNC) && !HAVE_DECL_FDATASYNC 1170 extern int fdatasync(int fildes); 1171 #endif 1172 1173 #ifdef HAVE_LONG_LONG_INT 1174 /* Older platforms may provide strto[u]ll functionality under other names */ 1175 #if !defined(HAVE_STRTOLL) && defined(HAVE___STRTOLL) 1176 #define strtoll __strtoll 1177 #define HAVE_STRTOLL 1 1178 #endif 1179 1180 #if !defined(HAVE_STRTOLL) && defined(HAVE_STRTOQ) 1181 #define strtoll strtoq 1182 #define HAVE_STRTOLL 1 1183 #endif 1184 1185 #if !defined(HAVE_STRTOULL) && defined(HAVE___STRTOULL) 1186 #define strtoull __strtoull 1187 #define HAVE_STRTOULL 1 1188 #endif 1189 1190 #if !defined(HAVE_STRTOULL) && defined(HAVE_STRTOUQ) 1191 #define strtoull strtouq 1192 #define HAVE_STRTOULL 1 1193 #endif 1194 1195 #if defined(HAVE_STRTOLL) && !HAVE_DECL_STRTOLL 1196 extern long long strtoll(const char *str, char **endptr, int base); 1197 #endif 1198 1199 #if defined(HAVE_STRTOULL) && !HAVE_DECL_STRTOULL 1200 extern unsigned long long strtoull(const char *str, char **endptr, int base); 1201 #endif 1202 #endif /* HAVE_LONG_LONG_INT */ 1203 1204 #if !defined(HAVE_MEMMOVE) && !defined(memmove) 1205 #define memmove(d, s, c) bcopy(s, d, c) 1206 #endif 1207 1208 /* no special DLL markers on most ports */ 1209 #ifndef PGDLLIMPORT 1210 #define PGDLLIMPORT 1211 #endif 1212 #ifndef PGDLLEXPORT 1213 #define PGDLLEXPORT 1214 #endif 1215 1216 /* 1217 * The following is used as the arg list for signal handlers. Any ports 1218 * that take something other than an int argument should override this in 1219 * their pg_config_os.h file. Note that variable names are required 1220 * because it is used in both the prototypes as well as the definitions. 1221 * Note also the long name. We expect that this won't collide with 1222 * other names causing compiler warnings. 1223 */ 1224 1225 #ifndef SIGNAL_ARGS 1226 #define SIGNAL_ARGS int postgres_signal_arg 1227 #endif 1228 1229 /* 1230 * When there is no sigsetjmp, its functionality is provided by plain 1231 * setjmp. Incidentally, nothing provides setjmp's functionality in 1232 * that case. We now support the case only on Windows. 1233 */ 1234 #ifdef WIN32 1235 #define sigjmp_buf jmp_buf 1236 #define sigsetjmp(x,y) setjmp(x) 1237 #define siglongjmp longjmp 1238 #endif 1239 1240 /* EXEC_BACKEND defines */ 1241 #ifdef EXEC_BACKEND 1242 #define NON_EXEC_STATIC 1243 #else 1244 #define NON_EXEC_STATIC static 1245 #endif 1246 1247 /* /port compatibility functions */ 1248 #include "port.h" 1249 1250 #endif /* C_H */ 1251