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glib/glib/gtypes.h
Stephan Bergmann 255c65f83c gmacros: Ensure GUINT32/64_SWAP_LE_BE macros parenthesize arguments 
Like all macros, we need to parenthesize arguments to ensure the order
of operations is correct.

See the mail thread starting at
<http://lists.fedoraproject.org/pipermail/devel/2013-March/180302.html>
"GCC produced wrong code in gvfs-1.14.2-3.fc18.x86_64" for how this
caused trouble with GVFS (which in turn caused trouble with
LibreOffice, where running "soffice sftp://.../.../test.odt" to access
an .odt file via GVFS failed to properly type-detect that file as a
Writer document and produced bogus error messages about the file being
broken).

https://bugzilla.gnome.org/show_bug.cgi?id=695925
2013-03-15 12:51:49 -04:00

485 lines
17 KiB
C
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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 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* 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_GINT64_CONSTANT(0xffffffffffffffffU)
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 ((gint32) (val)))
# define GUINT64_SWAP_LE_BE(val) ((guint64) __builtin_bswap64 ((gint64) (val)))
# endif
# if defined (__i386__)
# define GUINT16_SWAP_LE_BE_IA32(val) \
(G_GNUC_EXTENSION \
({ register 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 \
({ register 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 \
({ register 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 \
({ register 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 \
({ register 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 \
({ register 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 \
({ register 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 \
({ register 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))
/* 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;
};
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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