From 2a969b7f4bdb223d3626dc14b684701942ccafb2 Mon Sep 17 00:00:00 2001 From: Karen Arutyunov Date: Thu, 21 Sep 2017 01:02:04 +0300 Subject: Make package to be source rather than stub --- libpq/postgresql/c.h | 1107 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1107 insertions(+) create mode 100644 libpq/postgresql/c.h (limited to 'libpq/postgresql/c.h') diff --git a/libpq/postgresql/c.h b/libpq/postgresql/c.h new file mode 100644 index 0000000..726f0f3 --- /dev/null +++ b/libpq/postgresql/c.h @@ -0,0 +1,1107 @@ +/*------------------------------------------------------------------------- + * + * c.h + * Fundamental C definitions. This is included by every .c file in + * PostgreSQL (via either postgres.h or postgres_fe.h, as appropriate). + * + * Note that the definitions here are not intended to be exposed to clients + * of the frontend interface libraries --- so we don't worry much about + * polluting the namespace with lots of stuff... + * + * + * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * + * src/include/c.h + * + *------------------------------------------------------------------------- + */ +/* + *---------------------------------------------------------------- + * TABLE OF CONTENTS + * + * When adding stuff to this file, please try to put stuff + * into the relevant section, or add new sections as appropriate. + * + * section description + * ------- ------------------------------------------------ + * 0) pg_config.h and standard system headers + * 1) hacks to cope with non-ANSI C compilers + * 2) bool, true, false, TRUE, FALSE, NULL + * 3) standard system types + * 4) IsValid macros for system types + * 5) offsetof, lengthof, endof, alignment + * 6) assertions + * 7) widely useful macros + * 8) random stuff + * 9) system-specific hacks + * + * NOTE: since this file is included by both frontend and backend modules, it's + * almost certainly wrong to put an "extern" declaration here. typedefs and + * macros are the kind of thing that might go here. + * + *---------------------------------------------------------------- + */ +#ifndef C_H +#define C_H + +#include "postgres_ext.h" + +/* Must undef pg_config_ext.h symbols before including pg_config.h */ +#undef PG_INT64_TYPE + +#include "pg_config.h" +#include "pg_config_manual.h" /* must be after pg_config.h */ + +/* + * We always rely on the WIN32 macro being set by our build system, + * but _WIN32 is the compiler pre-defined macro. So make sure we define + * WIN32 whenever _WIN32 is set, to facilitate standalone building. + */ +#if defined(_WIN32) && !defined(WIN32) +#define WIN32 +#endif + +#if !defined(WIN32) && !defined(__CYGWIN__) /* win32 includes further down */ +#include "pg_config_os.h" /* must be before any system header files */ +#endif + +#if _MSC_VER >= 1400 || defined(HAVE_CRTDEFS_H) +#define errcode __msvc_errcode +#include +#undef errcode +#endif + +/* + * We have to include stdlib.h here because it defines many of these macros + * on some platforms, and we only want our definitions used if stdlib.h doesn't + * have its own. The same goes for stddef and stdarg if present. + */ + +#include +#include +#include +#include +#include +#ifdef HAVE_STRINGS_H +#include +#endif +#ifdef HAVE_STDINT_H +#include +#endif +#include + +#include +#if defined(WIN32) || defined(__CYGWIN__) +#include /* ensure O_BINARY is available */ +#endif + +#if defined(WIN32) || defined(__CYGWIN__) +/* We have to redefine some system functions after they are included above. */ +#include "pg_config_os.h" +#endif + +/* + * Force disable inlining if PG_FORCE_DISABLE_INLINE is defined. This is used + * to work around compiler bugs and might also be useful for investigatory + * purposes by defining the symbol in the platform's header.. + * + * This is done early (in slightly the wrong section) as functionality later + * in this file might want to rely on inline functions. + */ +#ifdef PG_FORCE_DISABLE_INLINE +#undef inline +#define inline +#endif + +/* Must be before gettext() games below */ +#include + +#define _(x) gettext(x) + +#ifdef ENABLE_NLS +#include +#else +#define gettext(x) (x) +#define dgettext(d,x) (x) +#define ngettext(s,p,n) ((n) == 1 ? (s) : (p)) +#define dngettext(d,s,p,n) ((n) == 1 ? (s) : (p)) +#endif + +/* + * Use this to mark string constants as needing translation at some later + * time, rather than immediately. This is useful for cases where you need + * access to the original string and translated string, and for cases where + * immediate translation is not possible, like when initializing global + * variables. + * http://www.gnu.org/software/autoconf/manual/gettext/Special-cases.html + */ +#define gettext_noop(x) (x) + + +/* ---------------------------------------------------------------- + * Section 1: hacks to cope with non-ANSI C compilers + * + * type prefixes (const, signed, volatile, inline) are handled in pg_config.h. + * ---------------------------------------------------------------- + */ + +/* + * CppAsString + * Convert the argument to a string, using the C preprocessor. + * CppConcat + * Concatenate two arguments together, using the C preprocessor. + * + * Note: There used to be support here for pre-ANSI C compilers that didn't + * support # and ##. Nowadays, these macros are just for clarity and/or + * backward compatibility with existing PostgreSQL code. + */ +#define CppAsString(identifier) #identifier +#define CppConcat(x, y) x##y + +/* + * dummyret is used to set return values in macros that use ?: to make + * assignments. gcc wants these to be void, other compilers like char + */ +#ifdef __GNUC__ /* GNU cc */ +#define dummyret void +#else +#define dummyret char +#endif + +/* Which __func__ symbol do we have, if any? */ +#ifdef HAVE_FUNCNAME__FUNC +#define PG_FUNCNAME_MACRO __func__ +#else +#ifdef HAVE_FUNCNAME__FUNCTION +#define PG_FUNCNAME_MACRO __FUNCTION__ +#else +#define PG_FUNCNAME_MACRO NULL +#endif +#endif + +/* ---------------------------------------------------------------- + * Section 2: bool, true, false, TRUE, FALSE, NULL + * ---------------------------------------------------------------- + */ + +/* + * bool + * Boolean value, either true or false. + * + * XXX for C++ compilers, we assume the compiler has a compatible + * built-in definition of bool. + */ + +#ifndef __cplusplus + +#ifndef bool +typedef char bool; +#endif + +#ifndef true +#define true ((bool) 1) +#endif + +#ifndef false +#define false ((bool) 0) +#endif +#endif /* not C++ */ + +typedef bool *BoolPtr; + +#ifndef TRUE +#define TRUE 1 +#endif + +#ifndef FALSE +#define FALSE 0 +#endif + +/* + * NULL + * Null pointer. + */ +#ifndef NULL +#define NULL ((void *) 0) +#endif + + +/* ---------------------------------------------------------------- + * Section 3: standard system types + * ---------------------------------------------------------------- + */ + +/* + * Pointer + * Variable holding address of any memory resident object. + * + * XXX Pointer arithmetic is done with this, so it can't be void * + * under "true" ANSI compilers. + */ +typedef char *Pointer; + +/* + * intN + * Signed integer, EXACTLY N BITS IN SIZE, + * used for numerical computations and the + * frontend/backend protocol. + */ +#ifndef HAVE_INT8 +typedef signed char int8; /* == 8 bits */ +typedef signed short int16; /* == 16 bits */ +typedef signed int int32; /* == 32 bits */ +#endif /* not HAVE_INT8 */ + +/* + * uintN + * Unsigned integer, EXACTLY N BITS IN SIZE, + * used for numerical computations and the + * frontend/backend protocol. + */ +#ifndef HAVE_UINT8 +typedef unsigned char uint8; /* == 8 bits */ +typedef unsigned short uint16; /* == 16 bits */ +typedef unsigned int uint32; /* == 32 bits */ +#endif /* not HAVE_UINT8 */ + +/* + * bitsN + * Unit of bitwise operation, AT LEAST N BITS IN SIZE. + */ +typedef uint8 bits8; /* >= 8 bits */ +typedef uint16 bits16; /* >= 16 bits */ +typedef uint32 bits32; /* >= 32 bits */ + +/* + * 64-bit integers + */ +#ifdef HAVE_LONG_INT_64 +/* Plain "long int" fits, use it */ + +#ifndef HAVE_INT64 +typedef long int int64; +#endif +#ifndef HAVE_UINT64 +typedef unsigned long int uint64; +#endif +#elif defined(HAVE_LONG_LONG_INT_64) +/* We have working support for "long long int", use that */ + +#ifndef HAVE_INT64 +typedef long long int int64; +#endif +#ifndef HAVE_UINT64 +typedef unsigned long long int uint64; +#endif +#else +/* neither HAVE_LONG_INT_64 nor HAVE_LONG_LONG_INT_64 */ +#error must have a working 64-bit integer datatype +#endif + +/* Decide if we need to decorate 64-bit constants */ +#ifdef HAVE_LL_CONSTANTS +#define INT64CONST(x) ((int64) x##LL) +#define UINT64CONST(x) ((uint64) x##ULL) +#else +#define INT64CONST(x) ((int64) x) +#define UINT64CONST(x) ((uint64) x) +#endif + +/* snprintf format strings to use for 64-bit integers */ +#define INT64_FORMAT "%" INT64_MODIFIER "d" +#define UINT64_FORMAT "%" INT64_MODIFIER "u" + +/* + * 128-bit signed and unsigned integers + * There currently is only a limited support for the type. E.g. 128bit + * literals and snprintf are not supported; but math is. + */ +#if defined(PG_INT128_TYPE) +#define HAVE_INT128 +typedef PG_INT128_TYPE int128; +typedef unsigned PG_INT128_TYPE uint128; +#endif + +/* + * stdint.h limits aren't guaranteed to be present and aren't guaranteed to + * have compatible types with our fixed width types. So just define our own. + */ +#define PG_INT8_MIN (-0x7F-1) +#define PG_INT8_MAX (0x7F) +#define PG_UINT8_MAX (0xFF) +#define PG_INT16_MIN (-0x7FFF-1) +#define PG_INT16_MAX (0x7FFF) +#define PG_UINT16_MAX (0xFFFF) +#define PG_INT32_MIN (-0x7FFFFFFF-1) +#define PG_INT32_MAX (0x7FFFFFFF) +#define PG_UINT32_MAX (0xFFFFFFFF) +#define PG_INT64_MIN (-INT64CONST(0x7FFFFFFFFFFFFFFF) - 1) +#define PG_INT64_MAX INT64CONST(0x7FFFFFFFFFFFFFFF) +#define PG_UINT64_MAX UINT64CONST(0xFFFFFFFFFFFFFFFF) + +/* Select timestamp representation (float8 or int64) */ +#ifdef USE_INTEGER_DATETIMES +#define HAVE_INT64_TIMESTAMP +#endif + +/* + * Size + * Size of any memory resident object, as returned by sizeof. + */ +typedef size_t Size; + +/* + * Index + * Index into any memory resident array. + * + * Note: + * Indices are non negative. + */ +typedef unsigned int Index; + +/* + * Offset + * Offset into any memory resident array. + * + * Note: + * This differs from an Index in that an Index is always + * non negative, whereas Offset may be negative. + */ +typedef signed int Offset; + +/* + * Common Postgres datatype names (as used in the catalogs) + */ +typedef float float4; +typedef double float8; + +/* + * Oid, RegProcedure, TransactionId, SubTransactionId, MultiXactId, + * CommandId + */ + +/* typedef Oid is in postgres_ext.h */ + +/* + * regproc is the type name used in the include/catalog headers, but + * RegProcedure is the preferred name in C code. + */ +typedef Oid regproc; +typedef regproc RegProcedure; + +typedef uint32 TransactionId; + +typedef uint32 LocalTransactionId; + +typedef uint32 SubTransactionId; + +#define InvalidSubTransactionId ((SubTransactionId) 0) +#define TopSubTransactionId ((SubTransactionId) 1) + +/* MultiXactId must be equivalent to TransactionId, to fit in t_xmax */ +typedef TransactionId MultiXactId; + +typedef uint32 MultiXactOffset; + +typedef uint32 CommandId; + +#define FirstCommandId ((CommandId) 0) +#define InvalidCommandId (~(CommandId)0) + +/* + * Array indexing support + */ +#define MAXDIM 6 +typedef struct +{ + int indx[MAXDIM]; +} IntArray; + +/* ---------------- + * Variable-length datatypes all share the 'struct varlena' header. + * + * NOTE: for TOASTable types, this is an oversimplification, since the value + * may be compressed or moved out-of-line. However datatype-specific routines + * are mostly content to deal with de-TOASTed values only, and of course + * client-side routines should never see a TOASTed value. But even in a + * de-TOASTed value, beware of touching vl_len_ directly, as its representation + * is no longer convenient. It's recommended that code always use the VARDATA, + * VARSIZE, and SET_VARSIZE macros instead of relying on direct mentions of + * the struct fields. See postgres.h for details of the TOASTed form. + * ---------------- + */ +struct varlena +{ + char vl_len_[4]; /* Do not touch this field directly! */ + char vl_dat[FLEXIBLE_ARRAY_MEMBER]; /* Data content is here */ +}; + +#define VARHDRSZ ((int32) sizeof(int32)) + +/* + * These widely-used datatypes are just a varlena header and the data bytes. + * There is no terminating null or anything like that --- the data length is + * always VARSIZE(ptr) - VARHDRSZ. + */ +typedef struct varlena bytea; +typedef struct varlena text; +typedef struct varlena BpChar; /* blank-padded char, ie SQL char(n) */ +typedef struct varlena VarChar; /* var-length char, ie SQL varchar(n) */ + +/* + * Specialized array types. These are physically laid out just the same + * as regular arrays (so that the regular array subscripting code works + * with them). They exist as distinct types mostly for historical reasons: + * they have nonstandard I/O behavior which we don't want to change for fear + * of breaking applications that look at the system catalogs. There is also + * an implementation issue for oidvector: it's part of the primary key for + * pg_proc, and we can't use the normal btree array support routines for that + * without circularity. + */ +typedef struct +{ + int32 vl_len_; /* these fields must match ArrayType! */ + int ndim; /* always 1 for int2vector */ + int32 dataoffset; /* always 0 for int2vector */ + Oid elemtype; + int dim1; + int lbound1; + int16 values[FLEXIBLE_ARRAY_MEMBER]; +} int2vector; + +typedef struct +{ + int32 vl_len_; /* these fields must match ArrayType! */ + int ndim; /* always 1 for oidvector */ + int32 dataoffset; /* always 0 for oidvector */ + Oid elemtype; + int dim1; + int lbound1; + Oid values[FLEXIBLE_ARRAY_MEMBER]; +} oidvector; + +/* + * Representation of a Name: effectively just a C string, but null-padded to + * exactly NAMEDATALEN bytes. The use of a struct is historical. + */ +typedef struct nameData +{ + char data[NAMEDATALEN]; +} NameData; +typedef NameData *Name; + +#define NameStr(name) ((name).data) + +/* + * Support macros for escaping strings. escape_backslash should be TRUE + * if generating a non-standard-conforming string. Prefixing a string + * with ESCAPE_STRING_SYNTAX guarantees it is non-standard-conforming. + * Beware of multiple evaluation of the "ch" argument! + */ +#define SQL_STR_DOUBLE(ch, escape_backslash) \ + ((ch) == '\'' || ((ch) == '\\' && (escape_backslash))) + +#define ESCAPE_STRING_SYNTAX 'E' + +/* ---------------------------------------------------------------- + * Section 4: IsValid macros for system types + * ---------------------------------------------------------------- + */ +/* + * BoolIsValid + * True iff bool is valid. + */ +#define BoolIsValid(boolean) ((boolean) == false || (boolean) == true) + +/* + * PointerIsValid + * True iff pointer is valid. + */ +#define PointerIsValid(pointer) ((const void*)(pointer) != NULL) + +/* + * PointerIsAligned + * True iff pointer is properly aligned to point to the given type. + */ +#define PointerIsAligned(pointer, type) \ + (((uintptr_t)(pointer) % (sizeof (type))) == 0) + +#define OidIsValid(objectId) ((bool) ((objectId) != InvalidOid)) + +#define RegProcedureIsValid(p) OidIsValid(p) + + +/* ---------------------------------------------------------------- + * Section 5: offsetof, lengthof, endof, alignment + * ---------------------------------------------------------------- + */ +/* + * offsetof + * Offset of a structure/union field within that structure/union. + * + * XXX This is supposed to be part of stddef.h, but isn't on + * some systems (like SunOS 4). + */ +#ifndef offsetof +#define offsetof(type, field) ((long) &((type *)0)->field) +#endif /* offsetof */ + +/* + * lengthof + * Number of elements in an array. + */ +#define lengthof(array) (sizeof (array) / sizeof ((array)[0])) + +/* + * endof + * Address of the element one past the last in an array. + */ +#define endof(array) (&(array)[lengthof(array)]) + +/* ---------------- + * Alignment macros: align a length or address appropriately for a given type. + * The fooALIGN() macros round up to a multiple of the required alignment, + * while the fooALIGN_DOWN() macros round down. The latter are more useful + * for problems like "how many X-sized structures will fit in a page?". + * + * NOTE: TYPEALIGN[_DOWN] will not work if ALIGNVAL is not a power of 2. + * That case seems extremely unlikely to be needed in practice, however. + * ---------------- + */ + +#define TYPEALIGN(ALIGNVAL,LEN) \ + (((uintptr_t) (LEN) + ((ALIGNVAL) - 1)) & ~((uintptr_t) ((ALIGNVAL) - 1))) + +#define SHORTALIGN(LEN) TYPEALIGN(ALIGNOF_SHORT, (LEN)) +#define INTALIGN(LEN) TYPEALIGN(ALIGNOF_INT, (LEN)) +#define LONGALIGN(LEN) TYPEALIGN(ALIGNOF_LONG, (LEN)) +#define DOUBLEALIGN(LEN) TYPEALIGN(ALIGNOF_DOUBLE, (LEN)) +#define MAXALIGN(LEN) TYPEALIGN(MAXIMUM_ALIGNOF, (LEN)) +/* MAXALIGN covers only built-in types, not buffers */ +#define BUFFERALIGN(LEN) TYPEALIGN(ALIGNOF_BUFFER, (LEN)) +#define CACHELINEALIGN(LEN) TYPEALIGN(PG_CACHE_LINE_SIZE, (LEN)) + +#define TYPEALIGN_DOWN(ALIGNVAL,LEN) \ + (((uintptr_t) (LEN)) & ~((uintptr_t) ((ALIGNVAL) - 1))) + +#define SHORTALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_SHORT, (LEN)) +#define INTALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_INT, (LEN)) +#define LONGALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_LONG, (LEN)) +#define DOUBLEALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_DOUBLE, (LEN)) +#define MAXALIGN_DOWN(LEN) TYPEALIGN_DOWN(MAXIMUM_ALIGNOF, (LEN)) + +/* + * The above macros will not work with types wider than uintptr_t, like with + * uint64 on 32-bit platforms. That's not problem for the usual use where a + * pointer or a length is aligned, but for the odd case that you need to + * align something (potentially) wider, use TYPEALIGN64. + */ +#define TYPEALIGN64(ALIGNVAL,LEN) \ + (((uint64) (LEN) + ((ALIGNVAL) - 1)) & ~((uint64) ((ALIGNVAL) - 1))) + +/* we don't currently need wider versions of the other ALIGN macros */ +#define MAXALIGN64(LEN) TYPEALIGN64(MAXIMUM_ALIGNOF, (LEN)) + +/* ---------------- + * Attribute macros + * + * GCC: https://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html + * GCC: https://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html + * Sunpro: https://docs.oracle.com/cd/E18659_01/html/821-1384/gjzke.html + * XLC: http://www-01.ibm.com/support/knowledgecenter/SSGH2K_11.1.0/com.ibm.xlc111.aix.doc/language_ref/function_attributes.html + * XLC: http://www-01.ibm.com/support/knowledgecenter/SSGH2K_11.1.0/com.ibm.xlc111.aix.doc/language_ref/type_attrib.html + * ---------------- + */ + +/* only GCC supports the unused attribute */ +#ifdef __GNUC__ +#define pg_attribute_unused() __attribute__((unused)) +#else +#define pg_attribute_unused() +#endif + +/* GCC and XLC support format attributes */ +#if defined(__GNUC__) || defined(__IBMC__) +#define pg_attribute_format_arg(a) __attribute__((format_arg(a))) +#define pg_attribute_printf(f,a) __attribute__((format(PG_PRINTF_ATTRIBUTE, f, a))) +#else +#define pg_attribute_format_arg(a) +#define pg_attribute_printf(f,a) +#endif + +/* GCC, Sunpro and XLC support aligned, packed and noreturn */ +#if defined(__GNUC__) || defined(__SUNPRO_C) || defined(__IBMC__) +#define pg_attribute_aligned(a) __attribute__((aligned(a))) +#define pg_attribute_noreturn() __attribute__((noreturn)) +#define pg_attribute_packed() __attribute__((packed)) +#define HAVE_PG_ATTRIBUTE_NORETURN 1 +#else +/* + * NB: aligned and packed are not given default definitions because they + * affect code functionality; they *must* be implemented by the compiler + * if they are to be used. + */ +#define pg_attribute_noreturn() +#endif + +/* ---------------------------------------------------------------- + * Section 6: assertions + * ---------------------------------------------------------------- + */ + +/* + * USE_ASSERT_CHECKING, if defined, turns on all the assertions. + * - plai 9/5/90 + * + * It should _NOT_ be defined in releases or in benchmark copies + */ + +/* + * Assert() can be used in both frontend and backend code. In frontend code it + * just calls the standard assert, if it's available. If use of assertions is + * not configured, it does nothing. + */ +#ifndef USE_ASSERT_CHECKING + +#define Assert(condition) ((void)true) +#define AssertMacro(condition) ((void)true) +#define AssertArg(condition) ((void)true) +#define AssertState(condition) ((void)true) +#define AssertPointerAlignment(ptr, bndr) ((void)true) +#define Trap(condition, errorType) ((void)true) +#define TrapMacro(condition, errorType) (true) + +#elif defined(FRONTEND) + +#include +#define Assert(p) assert(p) +#define AssertMacro(p) ((void) assert(p)) +#define AssertArg(condition) assert(condition) +#define AssertState(condition) assert(condition) +#define AssertPointerAlignment(ptr, bndr) ((void)true) +#else /* USE_ASSERT_CHECKING && !FRONTEND */ + +/* + * Trap + * Generates an exception if the given condition is true. + */ +#define Trap(condition, errorType) \ + do { \ + if (condition) \ + ExceptionalCondition(CppAsString(condition), (errorType), \ + __FILE__, __LINE__); \ + } while (0) + +/* + * TrapMacro is the same as Trap but it's intended for use in macros: + * + * #define foo(x) (AssertMacro(x != 0), bar(x)) + * + * Isn't CPP fun? + */ +#define TrapMacro(condition, errorType) \ + ((bool) (! (condition) || \ + (ExceptionalCondition(CppAsString(condition), (errorType), \ + __FILE__, __LINE__), 0))) + +#define Assert(condition) \ + Trap(!(condition), "FailedAssertion") + +#define AssertMacro(condition) \ + ((void) TrapMacro(!(condition), "FailedAssertion")) + +#define AssertArg(condition) \ + Trap(!(condition), "BadArgument") + +#define AssertState(condition) \ + Trap(!(condition), "BadState") + +/* + * Check that `ptr' is `bndr' aligned. + */ +#define AssertPointerAlignment(ptr, bndr) \ + Trap(TYPEALIGN(bndr, (uintptr_t)(ptr)) != (uintptr_t)(ptr), \ + "UnalignedPointer") + +#endif /* USE_ASSERT_CHECKING && !FRONTEND */ + +/* + * Macros to support compile-time assertion checks. + * + * If the "condition" (a compile-time-constant expression) evaluates to false, + * throw a compile error using the "errmessage" (a string literal). + * + * gcc 4.6 and up supports _Static_assert(), but there are bizarre syntactic + * placement restrictions. These macros make it safe to use as a statement + * or in an expression, respectively. + * + * Otherwise we fall back on a kluge that assumes the compiler will complain + * about a negative width for a struct bit-field. This will not include a + * helpful error message, but it beats not getting an error at all. + */ +#ifdef HAVE__STATIC_ASSERT +#define StaticAssertStmt(condition, errmessage) \ + do { _Static_assert(condition, errmessage); } while(0) +#define StaticAssertExpr(condition, errmessage) \ + ({ StaticAssertStmt(condition, errmessage); true; }) +#else /* !HAVE__STATIC_ASSERT */ +#define StaticAssertStmt(condition, errmessage) \ + ((void) sizeof(struct { int static_assert_failure : (condition) ? 1 : -1; })) +#define StaticAssertExpr(condition, errmessage) \ + StaticAssertStmt(condition, errmessage) +#endif /* HAVE__STATIC_ASSERT */ + + +/* + * Compile-time checks that a variable (or expression) has the specified type. + * + * AssertVariableIsOfType() can be used as a statement. + * AssertVariableIsOfTypeMacro() is intended for use in macros, eg + * #define foo(x) (AssertVariableIsOfTypeMacro(x, int), bar(x)) + * + * If we don't have __builtin_types_compatible_p, we can still assert that + * the types have the same size. This is far from ideal (especially on 32-bit + * platforms) but it provides at least some coverage. + */ +#ifdef HAVE__BUILTIN_TYPES_COMPATIBLE_P +#define AssertVariableIsOfType(varname, typename) \ + StaticAssertStmt(__builtin_types_compatible_p(__typeof__(varname), typename), \ + CppAsString(varname) " does not have type " CppAsString(typename)) +#define AssertVariableIsOfTypeMacro(varname, typename) \ + ((void) StaticAssertExpr(__builtin_types_compatible_p(__typeof__(varname), typename), \ + CppAsString(varname) " does not have type " CppAsString(typename))) +#else /* !HAVE__BUILTIN_TYPES_COMPATIBLE_P */ +#define AssertVariableIsOfType(varname, typename) \ + StaticAssertStmt(sizeof(varname) == sizeof(typename), \ + CppAsString(varname) " does not have type " CppAsString(typename)) +#define AssertVariableIsOfTypeMacro(varname, typename) \ + ((void) StaticAssertExpr(sizeof(varname) == sizeof(typename), \ + CppAsString(varname) " does not have type " CppAsString(typename))) +#endif /* HAVE__BUILTIN_TYPES_COMPATIBLE_P */ + + +/* ---------------------------------------------------------------- + * Section 7: widely useful macros + * ---------------------------------------------------------------- + */ +/* + * Max + * Return the maximum of two numbers. + */ +#define Max(x, y) ((x) > (y) ? (x) : (y)) + +/* + * Min + * Return the minimum of two numbers. + */ +#define Min(x, y) ((x) < (y) ? (x) : (y)) + +/* + * Abs + * Return the absolute value of the argument. + */ +#define Abs(x) ((x) >= 0 ? (x) : -(x)) + +/* + * StrNCpy + * Like standard library function strncpy(), except that result string + * is guaranteed to be null-terminated --- that is, at most N-1 bytes + * of the source string will be kept. + * Also, the macro returns no result (too hard to do that without + * evaluating the arguments multiple times, which seems worse). + * + * BTW: when you need to copy a non-null-terminated string (like a text + * datum) and add a null, do not do it with StrNCpy(..., len+1). That + * might seem to work, but it fetches one byte more than there is in the + * text object. One fine day you'll have a SIGSEGV because there isn't + * another byte before the end of memory. Don't laugh, we've had real + * live bug reports from real live users over exactly this mistake. + * Do it honestly with "memcpy(dst,src,len); dst[len] = '\0';", instead. + */ +#define StrNCpy(dst,src,len) \ + do \ + { \ + char * _dst = (dst); \ + Size _len = (len); \ +\ + if (_len > 0) \ + { \ + strncpy(_dst, (src), _len); \ + _dst[_len-1] = '\0'; \ + } \ + } while (0) + + +/* Get a bit mask of the bits set in non-long aligned addresses */ +#define LONG_ALIGN_MASK (sizeof(long) - 1) + +/* + * MemSet + * Exactly the same as standard library function memset(), but considerably + * faster for zeroing small word-aligned structures (such as parsetree nodes). + * This has to be a macro because the main point is to avoid function-call + * overhead. However, we have also found that the loop is faster than + * native libc memset() on some platforms, even those with assembler + * memset() functions. More research needs to be done, perhaps with + * MEMSET_LOOP_LIMIT tests in configure. + */ +#define MemSet(start, val, len) \ + do \ + { \ + /* must be void* because we don't know if it is integer aligned yet */ \ + void *_vstart = (void *) (start); \ + int _val = (val); \ + Size _len = (len); \ +\ + if ((((uintptr_t) _vstart) & LONG_ALIGN_MASK) == 0 && \ + (_len & LONG_ALIGN_MASK) == 0 && \ + _val == 0 && \ + _len <= MEMSET_LOOP_LIMIT && \ + /* \ + * If MEMSET_LOOP_LIMIT == 0, optimizer should find \ + * the whole "if" false at compile time. \ + */ \ + MEMSET_LOOP_LIMIT != 0) \ + { \ + long *_start = (long *) _vstart; \ + long *_stop = (long *) ((char *) _start + _len); \ + while (_start < _stop) \ + *_start++ = 0; \ + } \ + else \ + memset(_vstart, _val, _len); \ + } while (0) + +/* + * MemSetAligned is the same as MemSet except it omits the test to see if + * "start" is word-aligned. This is okay to use if the caller knows a-priori + * that the pointer is suitably aligned (typically, because he just got it + * from palloc(), which always delivers a max-aligned pointer). + */ +#define MemSetAligned(start, val, len) \ + do \ + { \ + long *_start = (long *) (start); \ + int _val = (val); \ + Size _len = (len); \ +\ + if ((_len & LONG_ALIGN_MASK) == 0 && \ + _val == 0 && \ + _len <= MEMSET_LOOP_LIMIT && \ + MEMSET_LOOP_LIMIT != 0) \ + { \ + long *_stop = (long *) ((char *) _start + _len); \ + while (_start < _stop) \ + *_start++ = 0; \ + } \ + else \ + memset(_start, _val, _len); \ + } while (0) + + +/* + * MemSetTest/MemSetLoop are a variant version that allow all the tests in + * MemSet to be done at compile time in cases where "val" and "len" are + * constants *and* we know the "start" pointer must be word-aligned. + * If MemSetTest succeeds, then it is okay to use MemSetLoop, otherwise use + * MemSetAligned. Beware of multiple evaluations of the arguments when using + * this approach. + */ +#define MemSetTest(val, len) \ + ( ((len) & LONG_ALIGN_MASK) == 0 && \ + (len) <= MEMSET_LOOP_LIMIT && \ + MEMSET_LOOP_LIMIT != 0 && \ + (val) == 0 ) + +#define MemSetLoop(start, val, len) \ + do \ + { \ + long * _start = (long *) (start); \ + long * _stop = (long *) ((char *) _start + (Size) (len)); \ + \ + while (_start < _stop) \ + *_start++ = 0; \ + } while (0) + + +/* + * Mark a point as unreachable in a portable fashion. This should preferably + * be something that the compiler understands, to aid code generation. + * In assert-enabled builds, we prefer abort() for debugging reasons. + */ +#if defined(HAVE__BUILTIN_UNREACHABLE) && !defined(USE_ASSERT_CHECKING) +#define pg_unreachable() __builtin_unreachable() +#elif defined(_MSC_VER) && !defined(USE_ASSERT_CHECKING) +#define pg_unreachable() __assume(0) +#else +#define pg_unreachable() abort() +#endif + + +/* ---------------------------------------------------------------- + * Section 8: random stuff + * ---------------------------------------------------------------- + */ + +/* msb for char */ +#define HIGHBIT (0x80) +#define IS_HIGHBIT_SET(ch) ((unsigned char)(ch) & HIGHBIT) + +#define STATUS_OK (0) +#define STATUS_ERROR (-1) +#define STATUS_EOF (-2) +#define STATUS_FOUND (1) +#define STATUS_WAITING (2) + + +/* + * Append PG_USED_FOR_ASSERTS_ONLY to definitions of variables that are only + * used in assert-enabled builds, to avoid compiler warnings about unused + * variables in assert-disabled builds. + */ +#ifdef USE_ASSERT_CHECKING +#define PG_USED_FOR_ASSERTS_ONLY +#else +#define PG_USED_FOR_ASSERTS_ONLY pg_attribute_unused() +#endif + + +/* gettext domain name mangling */ + +/* + * To better support parallel installations of major PostgreSQL + * versions as well as parallel installations of major library soname + * versions, we mangle the gettext domain name by appending those + * version numbers. The coding rule ought to be that wherever the + * domain name is mentioned as a literal, it must be wrapped into + * PG_TEXTDOMAIN(). The macros below do not work on non-literals; but + * that is somewhat intentional because it avoids having to worry + * about multiple states of premangling and postmangling as the values + * are being passed around. + * + * Make sure this matches the installation rules in nls-global.mk. + */ + +/* need a second indirection because we want to stringize the macro value, not the name */ +#define CppAsString2(x) CppAsString(x) + +#ifdef SO_MAJOR_VERSION +#define PG_TEXTDOMAIN(domain) (domain CppAsString2(SO_MAJOR_VERSION) "-" PG_MAJORVERSION) +#else +#define PG_TEXTDOMAIN(domain) (domain "-" PG_MAJORVERSION) +#endif + + +/* ---------------------------------------------------------------- + * Section 9: system-specific hacks + * + * This should be limited to things that absolutely have to be + * included in every source file. The port-specific header file + * is usually a better place for this sort of thing. + * ---------------------------------------------------------------- + */ + +/* + * NOTE: this is also used for opening text files. + * WIN32 treats Control-Z as EOF in files opened in text mode. + * Therefore, we open files in binary mode on Win32 so we can read + * literal control-Z. The other affect is that we see CRLF, but + * that is OK because we can already handle those cleanly. + */ +#if defined(WIN32) || defined(__CYGWIN__) +#define PG_BINARY O_BINARY +#define PG_BINARY_A "ab" +#define PG_BINARY_R "rb" +#define PG_BINARY_W "wb" +#else +#define PG_BINARY 0 +#define PG_BINARY_A "a" +#define PG_BINARY_R "r" +#define PG_BINARY_W "w" +#endif + +/* + * Provide prototypes for routines not present in a particular machine's + * standard C library. + */ + +#if !HAVE_DECL_SNPRINTF +extern int snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3, 4); +#endif + +#if !HAVE_DECL_VSNPRINTF +extern int vsnprintf(char *str, size_t count, const char *fmt, va_list args); +#endif + +#if !defined(HAVE_MEMMOVE) && !defined(memmove) +#define memmove(d, s, c) bcopy(s, d, c) +#endif + +/* no special DLL markers on most ports */ +#ifndef PGDLLIMPORT +#define PGDLLIMPORT +#endif +#ifndef PGDLLEXPORT +#define PGDLLEXPORT +#endif + +/* + * The following is used as the arg list for signal handlers. Any ports + * that take something other than an int argument should override this in + * their pg_config_os.h file. Note that variable names are required + * because it is used in both the prototypes as well as the definitions. + * Note also the long name. We expect that this won't collide with + * other names causing compiler warnings. + */ + +#ifndef SIGNAL_ARGS +#define SIGNAL_ARGS int postgres_signal_arg +#endif + +/* + * When there is no sigsetjmp, its functionality is provided by plain + * setjmp. Incidentally, nothing provides setjmp's functionality in + * that case. We now support the case only on Windows. + */ +#ifdef WIN32 +#define sigjmp_buf jmp_buf +#define sigsetjmp(x,y) setjmp(x) +#define siglongjmp longjmp +#endif + +#if defined(HAVE_FDATASYNC) && !HAVE_DECL_FDATASYNC +extern int fdatasync(int fildes); +#endif + +/* If strtoq() exists, rename it to the more standard strtoll() */ +#if defined(HAVE_LONG_LONG_INT_64) && !defined(HAVE_STRTOLL) && defined(HAVE_STRTOQ) +#define strtoll strtoq +#define HAVE_STRTOLL 1 +#endif + +/* If strtouq() exists, rename it to the more standard strtoull() */ +#if defined(HAVE_LONG_LONG_INT_64) && !defined(HAVE_STRTOULL) && defined(HAVE_STRTOUQ) +#define strtoull strtouq +#define HAVE_STRTOULL 1 +#endif + +/* + * We assume if we have these two functions, we have their friends too, and + * can use the wide-character functions. + */ +#if defined(HAVE_WCSTOMBS) && defined(HAVE_TOWLOWER) +#define USE_WIDE_UPPER_LOWER +#endif + +/* EXEC_BACKEND defines */ +#ifdef EXEC_BACKEND +#define NON_EXEC_STATIC +#else +#define NON_EXEC_STATIC static +#endif + +/* /port compatibility functions */ +#include "port.h" + +#endif /* C_H */ -- cgit v1.1