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glib/glib/gtypes.h
Emmanuele Bassi 9e5a53d576 Add reference counting types 
We have a common pattern for reference counting in GLib, but we always
implement it with ad hoc code. This is a good chance at trying to
standardise the implementation and make it public, so that other code
using GLib can take advantage of shared behaviour and semantics.

Instead of simply taking an integer variable, we should create type
aliases, to immediately distinguish the reference counting semantics of
the code; we can handle mixing atomic reference counting with a
non-atomic type (and vice versa) by using differently signed values for
the atomic and non-atomic cases.

The gatomicrefcount type is modelled on the Linux kernel refcount_t
type; the grefcount type is added to let single-threaded code bases to
avoid paying the price of atomic memory barriers on reference counting
operations.
2018-06-11 14:59:39 +01:00

542 lines
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/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
/*
* Modified by the GLib Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GLib Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GLib at ftp://ftp.gtk.org/pub/gtk/.
*/
#ifndef __G_TYPES_H__
#define __G_TYPES_H__
#if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
#error "Only <glib.h> can be included directly."
#endif
#include <glibconfig.h>
#include <glib/gmacros.h>
#include <glib/gversionmacros.h>
#include <time.h>
G_BEGIN_DECLS
/* Provide type definitions for commonly used types.
* These are useful because a "gint8" can be adjusted
* to be 1 byte (8 bits) on all platforms. Similarly and
* more importantly, "gint32" can be adjusted to be
* 4 bytes (32 bits) on all platforms.
*/
typedef char gchar;
typedef short gshort;
typedef long glong;
typedef int gint;
typedef gint gboolean;
typedef unsigned char guchar;
typedef unsigned short gushort;
typedef unsigned long gulong;
typedef unsigned int guint;
typedef float gfloat;
typedef double gdouble;
/* Define min and max constants for the fixed size numerical types */
#define G_MININT8 ((gint8) -0x80)
#define G_MAXINT8 ((gint8) 0x7f)
#define G_MAXUINT8 ((guint8) 0xff)
#define G_MININT16 ((gint16) -0x8000)
#define G_MAXINT16 ((gint16) 0x7fff)
#define G_MAXUINT16 ((guint16) 0xffff)
#define G_MININT32 ((gint32) -0x80000000)
#define G_MAXINT32 ((gint32) 0x7fffffff)
#define G_MAXUINT32 ((guint32) 0xffffffff)
#define G_MININT64 ((gint64) G_GINT64_CONSTANT(-0x8000000000000000))
#define G_MAXINT64 G_GINT64_CONSTANT(0x7fffffffffffffff)
#define G_MAXUINT64 G_GUINT64_CONSTANT(0xffffffffffffffff)
typedef void* gpointer;
typedef const void *gconstpointer;
typedef gint (*GCompareFunc) (gconstpointer a,
gconstpointer b);
typedef gint (*GCompareDataFunc) (gconstpointer a,
gconstpointer b,
gpointer user_data);
typedef gboolean (*GEqualFunc) (gconstpointer a,
gconstpointer b);
typedef void (*GDestroyNotify) (gpointer data);
typedef void (*GFunc) (gpointer data,
gpointer user_data);
typedef guint (*GHashFunc) (gconstpointer key);
typedef void (*GHFunc) (gpointer key,
gpointer value,
gpointer user_data);
/**
* GFreeFunc:
* @data: a data pointer
*
* Declares a type of function which takes an arbitrary
* data pointer argument and has no return value. It is
* not currently used in GLib or GTK+.
*/
typedef void (*GFreeFunc) (gpointer data);
/**
* GTranslateFunc:
* @str: the untranslated string
* @data: user data specified when installing the function, e.g.
* in g_option_group_set_translate_func()
*
* The type of functions which are used to translate user-visible
* strings, for <option>--help</option> output.
*
* Returns: a translation of the string for the current locale.
* The returned string is owned by GLib and must not be freed.
*/
typedef const gchar * (*GTranslateFunc) (const gchar *str,
gpointer data);
/* Define some mathematical constants that aren't available
* symbolically in some strict ISO C implementations.
*
* Note that the large number of digits used in these definitions
* doesn't imply that GLib or current computers in general would be
* able to handle floating point numbers with an accuracy like this.
* It's mostly an exercise in futility and future proofing. For
* extended precision floating point support, look somewhere else
* than GLib.
*/
#define G_E 2.7182818284590452353602874713526624977572470937000
#define G_LN2 0.69314718055994530941723212145817656807550013436026
#define G_LN10 2.3025850929940456840179914546843642076011014886288
#define G_PI 3.1415926535897932384626433832795028841971693993751
#define G_PI_2 1.5707963267948966192313216916397514420985846996876
#define G_PI_4 0.78539816339744830961566084581987572104929234984378
#define G_SQRT2 1.4142135623730950488016887242096980785696718753769
/* Portable endian checks and conversions
*
* glibconfig.h defines G_BYTE_ORDER which expands to one of
* the below macros.
*/
#define G_LITTLE_ENDIAN 1234
#define G_BIG_ENDIAN 4321
#define G_PDP_ENDIAN 3412 /* unused, need specific PDP check */
/* Basic bit swapping functions
*/
#define GUINT16_SWAP_LE_BE_CONSTANT(val) ((guint16) ( \
(guint16) ((guint16) (val) >> 8) | \
(guint16) ((guint16) (val) << 8)))
#define GUINT32_SWAP_LE_BE_CONSTANT(val) ((guint32) ( \
(((guint32) (val) & (guint32) 0x000000ffU) << 24) | \
(((guint32) (val) & (guint32) 0x0000ff00U) << 8) | \
(((guint32) (val) & (guint32) 0x00ff0000U) >> 8) | \
(((guint32) (val) & (guint32) 0xff000000U) >> 24)))
#define GUINT64_SWAP_LE_BE_CONSTANT(val) ((guint64) ( \
(((guint64) (val) & \
(guint64) G_GINT64_CONSTANT (0x00000000000000ffU)) << 56) | \
(((guint64) (val) & \
(guint64) G_GINT64_CONSTANT (0x000000000000ff00U)) << 40) | \
(((guint64) (val) & \
(guint64) G_GINT64_CONSTANT (0x0000000000ff0000U)) << 24) | \
(((guint64) (val) & \
(guint64) G_GINT64_CONSTANT (0x00000000ff000000U)) << 8) | \
(((guint64) (val) & \
(guint64) G_GINT64_CONSTANT (0x000000ff00000000U)) >> 8) | \
(((guint64) (val) & \
(guint64) G_GINT64_CONSTANT (0x0000ff0000000000U)) >> 24) | \
(((guint64) (val) & \
(guint64) G_GINT64_CONSTANT (0x00ff000000000000U)) >> 40) | \
(((guint64) (val) & \
(guint64) G_GINT64_CONSTANT (0xff00000000000000U)) >> 56)))
/* Arch specific stuff for speed
*/
#if defined (__GNUC__) && (__GNUC__ >= 2) && defined (__OPTIMIZE__)
# if __GNUC__ >= 4 && defined (__GNUC_MINOR__) && __GNUC_MINOR__ >= 3
# define GUINT32_SWAP_LE_BE(val) ((guint32) __builtin_bswap32 ((guint32) (val)))
# define GUINT64_SWAP_LE_BE(val) ((guint64) __builtin_bswap64 ((guint64) (val)))
# endif
# if defined (__i386__)
# define GUINT16_SWAP_LE_BE_IA32(val) \
(G_GNUC_EXTENSION \
({ guint16 __v, __x = ((guint16) (val)); \
if (__builtin_constant_p (__x)) \
__v = GUINT16_SWAP_LE_BE_CONSTANT (__x); \
else \
__asm__ ("rorw $8, %w0" \
: "=r" (__v) \
: "0" (__x) \
: "cc"); \
__v; }))
# if !defined (__i486__) && !defined (__i586__) \
&& !defined (__pentium__) && !defined (__i686__) \
&& !defined (__pentiumpro__) && !defined (__pentium4__)
# define GUINT32_SWAP_LE_BE_IA32(val) \
(G_GNUC_EXTENSION \
({ guint32 __v, __x = ((guint32) (val)); \
if (__builtin_constant_p (__x)) \
__v = GUINT32_SWAP_LE_BE_CONSTANT (__x); \
else \
__asm__ ("rorw $8, %w0\n\t" \
"rorl $16, %0\n\t" \
"rorw $8, %w0" \
: "=r" (__v) \
: "0" (__x) \
: "cc"); \
__v; }))
# else /* 486 and higher has bswap */
# define GUINT32_SWAP_LE_BE_IA32(val) \
(G_GNUC_EXTENSION \
({ guint32 __v, __x = ((guint32) (val)); \
if (__builtin_constant_p (__x)) \
__v = GUINT32_SWAP_LE_BE_CONSTANT (__x); \
else \
__asm__ ("bswap %0" \
: "=r" (__v) \
: "0" (__x)); \
__v; }))
# endif /* processor specific 32-bit stuff */
# define GUINT64_SWAP_LE_BE_IA32(val) \
(G_GNUC_EXTENSION \
({ union { guint64 __ll; \
guint32 __l[2]; } __w, __r; \
__w.__ll = ((guint64) (val)); \
if (__builtin_constant_p (__w.__ll)) \
__r.__ll = GUINT64_SWAP_LE_BE_CONSTANT (__w.__ll); \
else \
{ \
__r.__l[0] = GUINT32_SWAP_LE_BE (__w.__l[1]); \
__r.__l[1] = GUINT32_SWAP_LE_BE (__w.__l[0]); \
} \
__r.__ll; }))
/* Possibly just use the constant version and let gcc figure it out? */
# define GUINT16_SWAP_LE_BE(val) (GUINT16_SWAP_LE_BE_IA32 (val))
# ifndef GUINT32_SWAP_LE_BE
# define GUINT32_SWAP_LE_BE(val) (GUINT32_SWAP_LE_BE_IA32 (val))
# endif
# ifndef GUINT64_SWAP_LE_BE
# define GUINT64_SWAP_LE_BE(val) (GUINT64_SWAP_LE_BE_IA32 (val))
# endif
# elif defined (__ia64__)
# define GUINT16_SWAP_LE_BE_IA64(val) \
(G_GNUC_EXTENSION \
({ guint16 __v, __x = ((guint16) (val)); \
if (__builtin_constant_p (__x)) \
__v = GUINT16_SWAP_LE_BE_CONSTANT (__x); \
else \
__asm__ __volatile__ ("shl %0 = %1, 48 ;;" \
"mux1 %0 = %0, @rev ;;" \
: "=r" (__v) \
: "r" (__x)); \
__v; }))
# define GUINT32_SWAP_LE_BE_IA64(val) \
(G_GNUC_EXTENSION \
({ guint32 __v, __x = ((guint32) (val)); \
if (__builtin_constant_p (__x)) \
__v = GUINT32_SWAP_LE_BE_CONSTANT (__x); \
else \
__asm__ __volatile__ ("shl %0 = %1, 32 ;;" \
"mux1 %0 = %0, @rev ;;" \
: "=r" (__v) \
: "r" (__x)); \
__v; }))
# define GUINT64_SWAP_LE_BE_IA64(val) \
(G_GNUC_EXTENSION \
({ guint64 __v, __x = ((guint64) (val)); \
if (__builtin_constant_p (__x)) \
__v = GUINT64_SWAP_LE_BE_CONSTANT (__x); \
else \
__asm__ __volatile__ ("mux1 %0 = %1, @rev ;;" \
: "=r" (__v) \
: "r" (__x)); \
__v; }))
# define GUINT16_SWAP_LE_BE(val) (GUINT16_SWAP_LE_BE_IA64 (val))
# ifndef GUINT32_SWAP_LE_BE
# define GUINT32_SWAP_LE_BE(val) (GUINT32_SWAP_LE_BE_IA64 (val))
# endif
# ifndef GUINT64_SWAP_LE_BE
# define GUINT64_SWAP_LE_BE(val) (GUINT64_SWAP_LE_BE_IA64 (val))
# endif
# elif defined (__x86_64__)
# define GUINT32_SWAP_LE_BE_X86_64(val) \
(G_GNUC_EXTENSION \
({ guint32 __v, __x = ((guint32) (val)); \
if (__builtin_constant_p (__x)) \
__v = GUINT32_SWAP_LE_BE_CONSTANT (__x); \
else \
__asm__ ("bswapl %0" \
: "=r" (__v) \
: "0" (__x)); \
__v; }))
# define GUINT64_SWAP_LE_BE_X86_64(val) \
(G_GNUC_EXTENSION \
({ guint64 __v, __x = ((guint64) (val)); \
if (__builtin_constant_p (__x)) \
__v = GUINT64_SWAP_LE_BE_CONSTANT (__x); \
else \
__asm__ ("bswapq %0" \
: "=r" (__v) \
: "0" (__x)); \
__v; }))
/* gcc seems to figure out optimal code for this on its own */
# define GUINT16_SWAP_LE_BE(val) (GUINT16_SWAP_LE_BE_CONSTANT (val))
# ifndef GUINT32_SWAP_LE_BE
# define GUINT32_SWAP_LE_BE(val) (GUINT32_SWAP_LE_BE_X86_64 (val))
# endif
# ifndef GUINT64_SWAP_LE_BE
# define GUINT64_SWAP_LE_BE(val) (GUINT64_SWAP_LE_BE_X86_64 (val))
# endif
# else /* generic gcc */
# define GUINT16_SWAP_LE_BE(val) (GUINT16_SWAP_LE_BE_CONSTANT (val))
# ifndef GUINT32_SWAP_LE_BE
# define GUINT32_SWAP_LE_BE(val) (GUINT32_SWAP_LE_BE_CONSTANT (val))
# endif
# ifndef GUINT64_SWAP_LE_BE
# define GUINT64_SWAP_LE_BE(val) (GUINT64_SWAP_LE_BE_CONSTANT (val))
# endif
# endif
#else /* generic */
# define GUINT16_SWAP_LE_BE(val) (GUINT16_SWAP_LE_BE_CONSTANT (val))
# define GUINT32_SWAP_LE_BE(val) (GUINT32_SWAP_LE_BE_CONSTANT (val))
# define GUINT64_SWAP_LE_BE(val) (GUINT64_SWAP_LE_BE_CONSTANT (val))
#endif /* generic */
#define GUINT16_SWAP_LE_PDP(val) ((guint16) (val))
#define GUINT16_SWAP_BE_PDP(val) (GUINT16_SWAP_LE_BE (val))
#define GUINT32_SWAP_LE_PDP(val) ((guint32) ( \
(((guint32) (val) & (guint32) 0x0000ffffU) << 16) | \
(((guint32) (val) & (guint32) 0xffff0000U) >> 16)))
#define GUINT32_SWAP_BE_PDP(val) ((guint32) ( \
(((guint32) (val) & (guint32) 0x00ff00ffU) << 8) | \
(((guint32) (val) & (guint32) 0xff00ff00U) >> 8)))
/* The G*_TO_?E() macros are defined in glibconfig.h.
* The transformation is symmetric, so the FROM just maps to the TO.
*/
#define GINT16_FROM_LE(val) (GINT16_TO_LE (val))
#define GUINT16_FROM_LE(val) (GUINT16_TO_LE (val))
#define GINT16_FROM_BE(val) (GINT16_TO_BE (val))
#define GUINT16_FROM_BE(val) (GUINT16_TO_BE (val))
#define GINT32_FROM_LE(val) (GINT32_TO_LE (val))
#define GUINT32_FROM_LE(val) (GUINT32_TO_LE (val))
#define GINT32_FROM_BE(val) (GINT32_TO_BE (val))
#define GUINT32_FROM_BE(val) (GUINT32_TO_BE (val))
#define GINT64_FROM_LE(val) (GINT64_TO_LE (val))
#define GUINT64_FROM_LE(val) (GUINT64_TO_LE (val))
#define GINT64_FROM_BE(val) (GINT64_TO_BE (val))
#define GUINT64_FROM_BE(val) (GUINT64_TO_BE (val))
#define GLONG_FROM_LE(val) (GLONG_TO_LE (val))
#define GULONG_FROM_LE(val) (GULONG_TO_LE (val))
#define GLONG_FROM_BE(val) (GLONG_TO_BE (val))
#define GULONG_FROM_BE(val) (GULONG_TO_BE (val))
#define GINT_FROM_LE(val) (GINT_TO_LE (val))
#define GUINT_FROM_LE(val) (GUINT_TO_LE (val))
#define GINT_FROM_BE(val) (GINT_TO_BE (val))
#define GUINT_FROM_BE(val) (GUINT_TO_BE (val))
#define GSIZE_FROM_LE(val) (GSIZE_TO_LE (val))
#define GSSIZE_FROM_LE(val) (GSSIZE_TO_LE (val))
#define GSIZE_FROM_BE(val) (GSIZE_TO_BE (val))
#define GSSIZE_FROM_BE(val) (GSSIZE_TO_BE (val))
/* Portable versions of host-network order stuff
*/
#define g_ntohl(val) (GUINT32_FROM_BE (val))
#define g_ntohs(val) (GUINT16_FROM_BE (val))
#define g_htonl(val) (GUINT32_TO_BE (val))
#define g_htons(val) (GUINT16_TO_BE (val))
/* Overflow-checked unsigned integer arithmetic
*/
#ifndef _GLIB_TEST_OVERFLOW_FALLBACK
/* https://bugzilla.gnome.org/show_bug.cgi?id=769104 */
#if __GNUC__ >= 5 && !defined(__INTEL_COMPILER)
#define _GLIB_HAVE_BUILTIN_OVERFLOW_CHECKS
#elif g_macro__has_builtin(__builtin_uadd_overflow)
#define _GLIB_HAVE_BUILTIN_OVERFLOW_CHECKS
#endif
#endif
#define g_uint_checked_add(dest, a, b) \
_GLIB_CHECKED_ADD_U32(dest, a, b)
#define g_uint_checked_mul(dest, a, b) \
_GLIB_CHECKED_MUL_U32(dest, a, b)
#define g_uint64_checked_add(dest, a, b) \
_GLIB_CHECKED_ADD_U64(dest, a, b)
#define g_uint64_checked_mul(dest, a, b) \
_GLIB_CHECKED_MUL_U64(dest, a, b)
#if GLIB_SIZEOF_SIZE_T == 8
#define g_size_checked_add(dest, a, b) \
_GLIB_CHECKED_ADD_U64(dest, a, b)
#define g_size_checked_mul(dest, a, b) \
_GLIB_CHECKED_MUL_U64(dest, a, b)
#else
#define g_size_checked_add(dest, a, b) \
_GLIB_CHECKED_ADD_U32(dest, a, b)
#define g_size_checked_mul(dest, a, b) \
_GLIB_CHECKED_MUL_U32(dest, a, b)
#endif
/* The names of the following inlines are private. Use the macro
* definitions above.
*/
#ifdef _GLIB_HAVE_BUILTIN_OVERFLOW_CHECKS
static inline gboolean _GLIB_CHECKED_ADD_U32 (guint32 *dest, guint32 a, guint32 b) {
return !__builtin_uadd_overflow(a, b, dest); }
static inline gboolean _GLIB_CHECKED_MUL_U32 (guint32 *dest, guint32 a, guint32 b) {
return !__builtin_umul_overflow(a, b, dest); }
static inline gboolean _GLIB_CHECKED_ADD_U64 (guint64 *dest, guint64 a, guint64 b) {
G_STATIC_ASSERT(sizeof (unsigned long long) == sizeof (guint64));
return !__builtin_uaddll_overflow(a, b, (unsigned long long *) dest); }
static inline gboolean _GLIB_CHECKED_MUL_U64 (guint64 *dest, guint64 a, guint64 b) {
return !__builtin_umulll_overflow(a, b, (unsigned long long *) dest); }
#else
static inline gboolean _GLIB_CHECKED_ADD_U32 (guint32 *dest, guint32 a, guint32 b) {
*dest = a + b; return *dest >= a; }
static inline gboolean _GLIB_CHECKED_MUL_U32 (guint32 *dest, guint32 a, guint32 b) {
*dest = a * b; return !a || *dest / a == b; }
static inline gboolean _GLIB_CHECKED_ADD_U64 (guint64 *dest, guint64 a, guint64 b) {
*dest = a + b; return *dest >= a; }
static inline gboolean _GLIB_CHECKED_MUL_U64 (guint64 *dest, guint64 a, guint64 b) {
*dest = a * b; return !a || *dest / a == b; }
#endif
/* IEEE Standard 754 Single Precision Storage Format (gfloat):
*
* 31 30 23 22 0
* +--------+---------------+---------------+
* | s 1bit | e[30:23] 8bit | f[22:0] 23bit |
* +--------+---------------+---------------+
* B0------------------->B1------->B2-->B3-->
*
* IEEE Standard 754 Double Precision Storage Format (gdouble):
*
* 63 62 52 51 32 31 0
* +--------+----------------+----------------+ +---------------+
* | s 1bit | e[62:52] 11bit | f[51:32] 20bit | | f[31:0] 32bit |
* +--------+----------------+----------------+ +---------------+
* B0--------------->B1---------->B2--->B3----> B4->B5->B6->B7->
*/
/* subtract from biased_exponent to form base2 exponent (normal numbers) */
typedef union _GDoubleIEEE754 GDoubleIEEE754;
typedef union _GFloatIEEE754 GFloatIEEE754;
#define G_IEEE754_FLOAT_BIAS (127)
#define G_IEEE754_DOUBLE_BIAS (1023)
/* multiply with base2 exponent to get base10 exponent (normal numbers) */
#define G_LOG_2_BASE_10 (0.30102999566398119521)
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
union _GFloatIEEE754
{
gfloat v_float;
struct {
guint mantissa : 23;
guint biased_exponent : 8;
guint sign : 1;
} mpn;
};
union _GDoubleIEEE754
{
gdouble v_double;
struct {
guint mantissa_low : 32;
guint mantissa_high : 20;
guint biased_exponent : 11;
guint sign : 1;
} mpn;
};
#elif G_BYTE_ORDER == G_BIG_ENDIAN
union _GFloatIEEE754
{
gfloat v_float;
struct {
guint sign : 1;
guint biased_exponent : 8;
guint mantissa : 23;
} mpn;
};
union _GDoubleIEEE754
{
gdouble v_double;
struct {
guint sign : 1;
guint biased_exponent : 11;
guint mantissa_high : 20;
guint mantissa_low : 32;
} mpn;
};
#else /* !G_LITTLE_ENDIAN && !G_BIG_ENDIAN */
#error unknown ENDIAN type
#endif /* !G_LITTLE_ENDIAN && !G_BIG_ENDIAN */
typedef struct _GTimeVal GTimeVal;
struct _GTimeVal
{
glong tv_sec;
glong tv_usec;
};
typedef gint grefcount;
typedef volatile gint gatomicrefcount;
G_END_DECLS
/* We prefix variable declarations so they can
* properly get exported in Windows DLLs.
*/
#ifndef GLIB_VAR
# ifdef G_PLATFORM_WIN32
# ifdef GLIB_STATIC_COMPILATION
# define GLIB_VAR extern
# else /* !GLIB_STATIC_COMPILATION */
# ifdef GLIB_COMPILATION
# ifdef DLL_EXPORT
# define GLIB_VAR __declspec(dllexport)
# else /* !DLL_EXPORT */
# define GLIB_VAR extern
# endif /* !DLL_EXPORT */
# else /* !GLIB_COMPILATION */
# define GLIB_VAR extern __declspec(dllimport)
# endif /* !GLIB_COMPILATION */
# endif /* !GLIB_STATIC_COMPILATION */
# else /* !G_PLATFORM_WIN32 */
# define GLIB_VAR _GLIB_EXTERN
# endif /* !G_PLATFORM_WIN32 */
#endif /* GLIB_VAR */
#endif /* __G_TYPES_H__ */
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