* polluting the namespace with lots of stuff...
*
*
- * Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $PostgreSQL: pgsql/src/include/c.h,v 1.208 2006/07/29 17:35:07 momjian Exp $
+ * src/include/c.h
*
*-------------------------------------------------------------------------
*/
* 3) standard system types
* 4) IsValid macros for system types
* 5) offsetof, lengthof, endof, alignment
- * 6) widely useful macros
- * 7) random stuff
- * 8) system-specific hacks
+ * 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
+ * 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
-/*
- * 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 "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 */
-#if !defined(WIN32) && !defined(__CYGWIN__) /* win32 will include further down */
+
+/*
+ * 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
-#include "postgres_ext.h"
-#include "pg_trace.h"
-#if defined(_MSC_VER) || defined(__BORLANDC__)
-#define WIN32_ONLY_COMPILER
-#define errcode __vc_errcode
-#if defined(__BORLANDC__) || (_MSC_VER > 1400)
+#if _MSC_VER >= 1400 || defined(HAVE_CRTDEFS_H)
+#define errcode __msvc_errcode
#include <crtdefs.h>
-#endif
#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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
+#ifdef HAVE_STDINT_H
+#include <stdint.h>
+#endif
#include <sys/types.h>
#include <errno.h>
#if defined(WIN32) || defined(__CYGWIN__)
#include <fcntl.h> /* ensure O_BINARY is available */
#endif
-#ifdef HAVE_SUPPORTDEFS_H
-#include <SupportDefs.h>
-#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 <locale.h>
-#define _(x) gettext((x))
+#define _(x) gettext(x)
#ifdef ENABLE_NLS
#include <libintl.h>
#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 strings to be translated by gettext, in places where
- * you don't want an actual function call to occur (eg, constant tables).
+ * 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)
/*
* CppAsString
* Convert the argument to a string, using the C preprocessor.
+ * CppAsString2
+ * Convert the argument to a string, after one round of macro expansion.
* CppConcat
* Concatenate two arguments together, using the C preprocessor.
*
- * Note: the standard Autoconf macro AC_C_STRINGIZE actually only checks
- * whether #identifier works, but if we have that we likely have ## too.
+ * 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.
*/
-#if defined(HAVE_STRINGIZE)
-
#define CppAsString(identifier) #identifier
+#define CppAsString2(x) CppAsString(x)
#define CppConcat(x, y) x##y
-#else /* !HAVE_STRINGIZE */
-
-#define CppAsString(identifier) "identifier"
-
-/*
- * CppIdentity -- On Reiser based cpp's this is used to concatenate
- * two tokens. That is
- * CppIdentity(A)B ==> AB
- * We renamed it to _private_CppIdentity because it should not
- * be referenced outside this file. On other cpp's it
- * produces A B.
- */
-#define _priv_CppIdentity(x)x
-#define CppConcat(x, y) _priv_CppIdentity(x)y
-#endif /* !HAVE_STRINGIZE */
/*
* dummyret is used to set return values in macros that use ?: to make
#define dummyret char
#endif
-#ifndef __GNUC__
-#define __attribute__(_arg_)
+/* 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
/* ----------------------------------------------------------------
#ifndef false
#define false ((bool) 0)
#endif
-#endif /* not C++ */
+#endif /* not C++ */
typedef bool *BoolPtr;
typedef signed char int8; /* == 8 bits */
typedef signed short int16; /* == 16 bits */
typedef signed int int32; /* == 32 bits */
-#endif /* not HAVE_INT8 */
+#endif /* not HAVE_INT8 */
/*
* uintN
typedef unsigned char uint8; /* == 8 bits */
typedef unsigned short uint16; /* == 16 bits */
typedef unsigned int uint32; /* == 32 bits */
-#endif /* not HAVE_UINT8 */
+#endif /* not HAVE_UINT8 */
/*
* bitsN
typedef uint16 bits16; /* >= 16 bits */
typedef uint32 bits32; /* >= 32 bits */
-/*
- * floatN
- * Floating point number, AT LEAST N BITS IN SIZE,
- * used for numerical computations.
- *
- * Since sizeof(floatN) may be > sizeof(char *), always pass
- * floatN by reference.
- *
- * XXX: these typedefs are now deprecated in favor of float4 and float8.
- * They will eventually go away.
- */
-typedef float float32data;
-typedef double float64data;
-typedef float *float32;
-typedef double *float64;
-
/*
* 64-bit integers
*/
#ifndef HAVE_UINT64
typedef unsigned long long int uint64;
#endif
-#else /* not HAVE_LONG_INT_64 and not
- * HAVE_LONG_LONG_INT_64 */
-
-/* Won't actually work, but fall back to long int so that code compiles */
-#ifndef HAVE_INT64
-typedef long int int64;
-#endif
-#ifndef HAVE_UINT64
-typedef unsigned long int uint64;
+#else
+/* neither HAVE_LONG_INT_64 nor HAVE_LONG_LONG_INT_64 */
+#error must have a working 64-bit integer datatype
#endif
-#define INT64_IS_BUSTED
-#endif /* not HAVE_LONG_INT_64 and not
- * HAVE_LONG_LONG_INT_64 */
-
/* Decide if we need to decorate 64-bit constants */
#ifdef HAVE_LL_CONSTANTS
#define INT64CONST(x) ((int64) x##LL)
#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"
-/* Select timestamp representation (float8 or int64) */
-#if defined(USE_INTEGER_DATETIMES) && !defined(INT64_IS_BUSTED)
-#define HAVE_INT64_TIMESTAMP
+/*
+ * 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
-/* sig_atomic_t is required by ANSI C, but may be missing on old platforms */
-#ifndef HAVE_SIG_ATOMIC_T
-typedef int sig_atomic_t;
-#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)
+
+/*
+ * We now always use int64 timestamps, but keep this symbol defined for the
+ * benefit of external code that might test it.
+ */
+#define HAVE_INT64_TIMESTAMP
/*
* Size
/*
* Common Postgres datatype names (as used in the catalogs)
*/
-typedef int16 int2;
-typedef int32 int4;
typedef float float4;
typedef double float8;
typedef uint32 TransactionId;
+typedef uint32 LocalTransactionId;
+
typedef uint32 SubTransactionId;
#define InvalidSubTransactionId ((SubTransactionId) 0)
typedef uint32 CommandId;
#define FirstCommandId ((CommandId) 0)
+#define InvalidCommandId (~(CommandId)0)
/*
* Array indexing support
typedef struct
{
int indx[MAXDIM];
-} IntArray;
+} 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
+ * 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. See postgres.h for
- * details of the TOASTed form.
+ * client-side routines should never see a TOASTed value. But even in a
+ * de-TOASTed value, beware of touching vl_len_ directly, as its
+ * representation is no longer convenient. It's recommended that code always
+ * use macros VARDATA_ANY, VARSIZE_ANY, VARSIZE_ANY_EXHDR, VARDATA, VARSIZE,
+ * and SET_VARSIZE instead of relying on direct mentions of the struct fields.
+ * See postgres.h for details of the TOASTed form.
* ----------------
*/
struct varlena
{
- int32 vl_len;
- char vl_dat[1];
+ 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.
+ * always VARSIZE_ANY_EXHDR(ptr).
*/
typedef struct varlena bytea;
typedef struct varlena text;
/*
* 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:
+ * 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
*/
typedef struct
{
- int32 size; /* these fields must match ArrayType! */
+ 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;
- int2 values[1]; /* VARIABLE LENGTH ARRAY */
-} int2vector; /* VARIABLE LENGTH STRUCT */
+ int16 values[FLEXIBLE_ARRAY_MEMBER];
+} int2vector;
typedef struct
{
- int32 size; /* these fields must match ArrayType! */
+ 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[1]; /* VARIABLE LENGTH ARRAY */
-} oidvector; /* VARIABLE LENGTH STRUCT */
+ Oid values[FLEXIBLE_ARRAY_MEMBER];
+} oidvector;
/*
- * We want NameData to have length NAMEDATALEN and int alignment,
- * because that's how the data type 'name' is defined in pg_type.
- * Use a union to make sure the compiler agrees. Note that NAMEDATALEN
- * must be a multiple of sizeof(int), else sizeof(NameData) will probably
- * not come out equal to NAMEDATALEN.
+ * Representation of a Name: effectively just a C string, but null-padded to
+ * exactly NAMEDATALEN bytes. The use of a struct is historical.
*/
-typedef union nameData
+typedef struct nameData
{
char data[NAMEDATALEN];
- int alignmentDummy;
} NameData;
typedef NameData *Name;
* PointerIsValid
* True iff pointer is valid.
*/
-#define PointerIsValid(pointer) ((void*)(pointer) != NULL)
+#define PointerIsValid(pointer) ((const void*)(pointer) != NULL)
/*
* PointerIsAligned
* True iff pointer is properly aligned to point to the given type.
*/
#define PointerIsAligned(pointer, type) \
- (((long)(pointer) % (sizeof (type))) == 0)
+ (((uintptr_t)(pointer) % (sizeof (type))) == 0)
+
+#define OffsetToPointer(base, offset) \
+ ((void *)((char *) base + offset))
#define OidIsValid(objectId) ((bool) ((objectId) != InvalidOid))
*/
#ifndef offsetof
#define offsetof(type, field) ((long) &((type *)0)->field)
-#endif /* offsetof */
+#endif /* offsetof */
/*
* lengthof
/* ----------------
* 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?".
*
- * There used to be some incredibly crufty platform-dependent hackery here,
- * but now we rely on the configure script to get the info for us. Much nicer.
- *
- * NOTE: TYPEALIGN will not work if ALIGNVAL is not a power of 2.
- * That case seems extremely unlikely to occur in practice, however.
+ * 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) \
- (((long) (LEN) + ((ALIGNVAL) - 1)) & ~((long) ((ALIGNVAL) - 1)))
+ (((uintptr_t) (LEN) + ((ALIGNVAL) - 1)) & ~((uintptr_t) ((ALIGNVAL) - 1)))
#define SHORTALIGN(LEN) TYPEALIGN(ALIGNOF_SHORT, (LEN))
#define INTALIGN(LEN) TYPEALIGN(ALIGNOF_INT, (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 <assert.h>
+#define Assert(p) assert(p)
+#define AssertMacro(p) ((void) assert(p))
+#define AssertArg(condition) assert(condition)
+#define AssertState(condition) assert(condition)
+#define AssertPointerAlignment(ptr, bndr) ((void)true)
+#else /* USE_ASSERT_CHECKING && !FRONTEND */
+
+/*
+ * Trap
+ * Generates an exception if the given condition is true.
+ */
+#define Trap(condition, errorType) \
+ do { \
+ if (condition) \
+ ExceptionalCondition(CppAsString(condition), (errorType), \
+ __FILE__, __LINE__); \
+ } while (0)
+
+/*
+ * TrapMacro is the same as Trap but it's intended for use in macros:
+ *
+ * #define foo(x) (AssertMacro(x != 0), bar(x))
+ *
+ * Isn't CPP fun?
+ */
+#define TrapMacro(condition, errorType) \
+ ((bool) (! (condition) || \
+ (ExceptionalCondition(CppAsString(condition), (errorType), \
+ __FILE__, __LINE__), 0)))
+
+#define Assert(condition) \
+ Trap(!(condition), "FailedAssertion")
+
+#define AssertMacro(condition) \
+ ((void) TrapMacro(!(condition), "FailedAssertion"))
+
+#define AssertArg(condition) \
+ Trap(!(condition), "BadArgument")
+
+#define AssertState(condition) \
+ Trap(!(condition), "BadState")
+
+/*
+ * Check that `ptr' is `bndr' aligned.
+ */
+#define AssertPointerAlignment(ptr, bndr) \
+ Trap(TYPEALIGN(bndr, (uintptr_t)(ptr)) != (uintptr_t)(ptr), \
+ "UnalignedPointer")
+
+#endif /* USE_ASSERT_CHECKING && !FRONTEND */
+
+/*
+ * 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 6: widely useful macros
+ * Section 7: widely useful macros
* ----------------------------------------------------------------
*/
/*
* 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
+ * 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.
*/
* 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
+ * 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.
int _val = (val); \
Size _len = (len); \
\
- if ((((long) _vstart) & LONG_ALIGN_MASK) == 0 && \
+ if ((((uintptr_t) _vstart) & LONG_ALIGN_MASK) == 0 && \
(_len & LONG_ALIGN_MASK) == 0 && \
_val == 0 && \
_len <= MEMSET_LOOP_LIMIT && \
} 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
+
+
+/*
+ * Hints to the compiler about the likelihood of a branch. Both likely() and
+ * unlikely() return the boolean value of the contained expression.
+ *
+ * These should only be used sparingly, in very hot code paths. It's very easy
+ * to mis-estimate likelihoods.
+ */
+#if __GNUC__ >= 3
+#define likely(x) __builtin_expect((x) != 0, 1)
+#define unlikely(x) __builtin_expect((x) != 0, 0)
+#else
+#define likely(x) ((x) != 0)
+#define unlikely(x) ((x) != 0)
+#endif
+
+
/* ----------------------------------------------------------------
- * Section 7: random stuff
+ * Section 8: random stuff
* ----------------------------------------------------------------
*/
#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.
+ */
+#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 8: system-specific hacks
+ * 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
+ * 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
+ * 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
-#if defined(sun) && defined(__sparc__) && !defined(__SVR4)
-#include <unistd.h>
-#endif
-
-/* These are for things that are one way on Unix and another on NT */
-#define NULL_DEV "/dev/null"
-
/*
* 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,...)
-/* This extension allows gcc to check the format string */
-__attribute__((format(printf, 3, 4)));
+extern int snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3, 4);
#endif
#if !HAVE_DECL_VSNPRINTF
#define memmove(d, s, c) bcopy(s, d, c)
#endif
-#ifndef DLLIMPORT
-#define DLLIMPORT /* no special DLL markers on most ports */
+/* no special DLL markers on most ports */
+#ifndef PGDLLIMPORT
+#define PGDLLIMPORT
+#endif
+#ifndef PGDLLEXPORT
+#define PGDLLEXPORT
#endif
/*
/*
* When there is no sigsetjmp, its functionality is provided by plain
* setjmp. Incidentally, nothing provides setjmp's functionality in
- * that case.
+ * that case. We now support the case only on Windows.
*/
-#ifndef HAVE_SIGSETJMP
+#ifdef WIN32
#define sigjmp_buf jmp_buf
#define sigsetjmp(x,y) setjmp(x)
#define siglongjmp longjmp
#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
/* /port compatibility functions */
#include "port.h"
-#endif /* C_H */
+#endif /* C_H */
projects / postgresql / blobdiff