jstypes.h

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code, released
 * March 31, 1998.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   IBM Corp.
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * the provisions above, a recipient may use your version of this file under
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 *
 * ***** END LICENSE BLOCK ***** */

/*
** File:                jstypes.h
** Description: Definitions of NSPR's basic types
**
** Prototypes and macros used to make up for deficiencies in ANSI environments
** that we have found.
**
** Since we do not wrap <stdlib.h> and all the other standard headers, authors
** of portable code will not know in general that they need these definitions.
** Instead of requiring these authors to find the dependent uses in their code
** and take the following steps only in those C files, we take steps once here
** for all C files.
**/

#ifndef jstypes_h___
#define jstypes_h___

#include <stddef.h>

/***********************************************************************
** MACROS:      JS_EXTERN_API
**              JS_EXPORT_API
** DESCRIPTION:
**      These are only for externally visible routines and globals.  For
**      internal routines, just use "extern" for type checking and that
**      will not export internal cross-file or forward-declared symbols.
**      Define a macro for declaring procedures return types. We use this to
**      deal with windoze specific type hackery for DLL definitions. Use
**      JS_EXTERN_API when the prototype for the method is declared. Use
**      JS_EXPORT_API for the implementation of the method.
**
** Example:
**   in dowhim.h
**     JS_EXTERN_API( void ) DoWhatIMean( void );
**   in dowhim.c
**     JS_EXPORT_API( void ) DoWhatIMean( void ) { return; }
**
**
***********************************************************************/
#ifdef WIN32

/* These also work for __MWERKS__ */
# define JS_EXTERN_API(__type)  extern __declspec(dllexport) __type
# define JS_EXPORT_API(__type)  __declspec(dllexport) __type
# define JS_EXTERN_DATA(__type) extern __declspec(dllexport) __type
# define JS_EXPORT_DATA(__type) __declspec(dllexport) __type

#elif defined(XP_OS2) && defined(__declspec)

# define JS_EXTERN_API(__type)  extern __declspec(dllexport) __type
# define JS_EXPORT_API(__type)  __declspec(dllexport) __type
# define JS_EXTERN_DATA(__type) extern __declspec(dllexport) __type
# define JS_EXPORT_DATA(__type) __declspec(dllexport) __type

#else /* Unix */

# ifdef HAVE_VISIBILITY_ATTRIBUTE
#  define JS_EXTERNAL_VIS __attribute__((visibility ("default")))
# elif defined(__SUNPRO_C) || defined(__SUNPRO_CC)
#  define JS_EXTERNAL_VIS __global
# else
#  define JS_EXTERNAL_VIS
# endif

# define JS_EXTERN_API(__type)  extern JS_EXTERNAL_VIS __type
# define JS_EXPORT_API(__type)  JS_EXTERNAL_VIS __type
# define JS_EXTERN_DATA(__type) extern JS_EXTERNAL_VIS __type
# define JS_EXPORT_DATA(__type) JS_EXTERNAL_VIS __type

#endif

#ifdef _WIN32
# if defined(__MWERKS__) || defined(__GNUC__)
#  define JS_IMPORT_API(__x)    __x
# else
#  define JS_IMPORT_API(__x)    __declspec(dllimport) __x
# endif
#elif defined(XP_OS2) && defined(__declspec)
# define JS_IMPORT_API(__x)     __declspec(dllimport) __x
#else
# define JS_IMPORT_API(__x)     JS_EXPORT_API (__x)
#endif

#if defined(_WIN32) && !defined(__MWERKS__)
# define JS_IMPORT_DATA(__x)      __declspec(dllimport) __x
#elif defined(XP_OS2) && defined(__declspec)
# define JS_IMPORT_DATA(__x)      __declspec(dllimport) __x
#else
# define JS_IMPORT_DATA(__x)     JS_EXPORT_DATA (__x)
#endif

/*
 * The linkage of JS API functions differs depending on whether the file is
 * used within the JS library or not. Any source file within the JS
 * interpreter should define EXPORT_JS_API whereas any client of the library
 * should not. STATIC_JS_API is used to build JS as a static library.
 */
#if defined(STATIC_JS_API)

# define JS_PUBLIC_API(t)   t
# define JS_PUBLIC_DATA(t)  t

#elif defined(EXPORT_JS_API)

# define JS_PUBLIC_API(t)   JS_EXPORT_API(t)
# define JS_PUBLIC_DATA(t)  JS_EXPORT_DATA(t)

#else

# define JS_PUBLIC_API(t)   JS_IMPORT_API(t)
# define JS_PUBLIC_DATA(t)  JS_IMPORT_DATA(t)

#endif

#define JS_FRIEND_API(t)    JS_PUBLIC_API(t)
#define JS_FRIEND_DATA(t)   JS_PUBLIC_DATA(t)

#if defined(_MSC_VER) && defined(_M_IX86)
#define JS_FASTCALL __fastcall
#elif defined(__GNUC__) && defined(__i386__) &&                         \
  ((__GNUC__ >= 4) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
#define JS_FASTCALL __attribute__((fastcall))
#else
#define JS_FASTCALL
#define JS_NO_FASTCALL
#endif

#ifndef JS_INLINE
# if defined __cplusplus
#  define JS_INLINE          inline
# elif defined _MSC_VER
#  define JS_INLINE          __inline
# elif defined __GNUC__
#  define JS_INLINE          __inline__
# else
#  define JS_INLINE          inline
# endif
#endif

#ifndef JS_ALWAYS_INLINE
# if defined DEBUG
#  define JS_ALWAYS_INLINE   JS_INLINE
# elif defined _MSC_VER
#  define JS_ALWAYS_INLINE   __forceinline
# elif defined __GNUC__
#  define JS_ALWAYS_INLINE   __attribute__((always_inline))
# else
#  define JS_ALWAYS_INLINE   JS_INLINE
# endif
#endif

/***********************************************************************
** MACROS:      JS_BEGIN_MACRO
**              JS_END_MACRO
** DESCRIPTION:
**      Macro body brackets so that macros with compound statement definitions
**      behave syntactically more like functions when called.
***********************************************************************/
#define JS_BEGIN_MACRO  do {

#if defined(_MSC_VER) && _MSC_VER >= 1400
# define JS_END_MACRO                                                         \
    } __pragma(warning(push)) __pragma(warning(disable:4127))                 \
    while (0) __pragma(warning(pop))
#else
# define JS_END_MACRO   } while (0)
#endif

/***********************************************************************
** MACROS:      JS_BEGIN_EXTERN_C
**              JS_END_EXTERN_C
** DESCRIPTION:
**      Macro shorthands for conditional C++ extern block delimiters.
***********************************************************************/
#ifdef __cplusplus

# define JS_BEGIN_EXTERN_C      extern "C" {
# define JS_END_EXTERN_C        }

#else

# define JS_BEGIN_EXTERN_C
# define JS_END_EXTERN_C

#endif

/***********************************************************************
** MACROS:      JS_BIT
**              JS_BITMASK
** DESCRIPTION:
** Bit masking macros.  XXX n must be <= 31 to be portable
***********************************************************************/
#define JS_BIT(n)       ((JSUint32)1 << (n))
#define JS_BITMASK(n)   (JS_BIT(n) - 1)

/***********************************************************************
** MACROS:      JS_PTR_TO_INT32
**              JS_PTR_TO_UINT32
**              JS_INT32_TO_PTR
**              JS_UINT32_TO_PTR
** DESCRIPTION:
** Integer to pointer and pointer to integer conversion macros.
***********************************************************************/
#define JS_PTR_TO_INT32(x)  ((jsint)((char *)(x) - (char *)0))
#define JS_PTR_TO_UINT32(x) ((jsuint)((char *)(x) - (char *)0))
#define JS_INT32_TO_PTR(x)  ((void *)((char *)0 + (jsint)(x)))
#define JS_UINT32_TO_PTR(x) ((void *)((char *)0 + (jsuint)(x)))

/***********************************************************************
** MACROS:      JS_HOWMANY
**              JS_ROUNDUP
**              JS_MIN
**              JS_MAX
** DESCRIPTION:
**      Commonly used macros for operations on compatible types.
***********************************************************************/
#define JS_HOWMANY(x,y) (((x)+(y)-1)/(y))
#define JS_ROUNDUP(x,y) (JS_HOWMANY(x,y)*(y))
#define JS_MIN(x,y)     ((x)<(y)?(x):(y))
#define JS_MAX(x,y)     ((x)>(y)?(x):(y))

#if (defined(XP_WIN) && !defined(CROSS_COMPILE)) || defined (WINCE)
# include "jscpucfg.h"      /* Use standard Mac or Windows configuration */
#elif defined(XP_UNIX) || defined(XP_BEOS) || defined(XP_OS2) || defined(CROSS_COMPILE)
# include "jsautocfg.h"     /* Use auto-detected configuration */
#else
# error "Must define one of XP_BEOS, XP_OS2, XP_WIN or XP_UNIX"
#endif

JS_BEGIN_EXTERN_C

/************************************************************************
** TYPES:       JSUint8
**              JSInt8
** DESCRIPTION:
**  The int8 types are known to be 8 bits each. There is no type that
**      is equivalent to a plain "char".
************************************************************************/
#if JS_BYTES_PER_BYTE == 1
typedef unsigned char JSUint8;
typedef signed char JSInt8;
#else
# error No suitable type for JSInt8/JSUint8
#endif

/************************************************************************
** TYPES:       JSUint16
**              JSInt16
** DESCRIPTION:
**  The int16 types are known to be 16 bits each.
************************************************************************/
#if JS_BYTES_PER_SHORT == 2
typedef unsigned short JSUint16;
typedef short JSInt16;
#else
# error No suitable type for JSInt16/JSUint16
#endif

/************************************************************************
** TYPES:       JSUint32
**              JSInt32
** DESCRIPTION:
**  The int32 types are known to be 32 bits each.
************************************************************************/
#if JS_BYTES_PER_INT == 4
typedef unsigned int JSUint32;
typedef int JSInt32;
# define JS_INT32(x)    x
# define JS_UINT32(x)   x ## U
#elif JS_BYTES_PER_LONG == 4
typedef unsigned long JSUint32;
typedef long JSInt32;
# define JS_INT32(x)    x ## L
# define JS_UINT32(x)   x ## UL
#else
# error No suitable type for JSInt32/JSUint32
#endif

/************************************************************************
** TYPES:       JSUint64
**              JSInt64
** DESCRIPTION:
**  The int64 types are known to be 64 bits each. Care must be used when
**      declaring variables of type JSUint64 or JSInt64. Different hardware
**      architectures and even different compilers have varying support for
**      64 bit values. The only guaranteed portability requires the use of
**      the JSLL_ macros (see jslong.h).
************************************************************************/
#ifdef JS_HAVE_LONG_LONG

# if JS_BYTES_PER_LONG == 8
typedef long JSInt64;
typedef unsigned long JSUint64;
# elif defined(WIN16)
typedef __int64 JSInt64;
typedef unsigned __int64 JSUint64;
# elif defined(WIN32) && !defined(__GNUC__)
typedef __int64  JSInt64;
typedef unsigned __int64 JSUint64;
# else
typedef long long JSInt64;
typedef unsigned long long JSUint64;
# endif /* JS_BYTES_PER_LONG == 8 */

#else  /* !JS_HAVE_LONG_LONG */

typedef struct {
# ifdef IS_LITTLE_ENDIAN
    JSUint32 lo, hi;
# else
    JSUint32 hi, lo;
#endif
} JSInt64;
typedef JSInt64 JSUint64;

#endif /* !JS_HAVE_LONG_LONG */

/************************************************************************
** TYPES:       JSUintn
**              JSIntn
** DESCRIPTION:
**  The JSIntn types are most appropriate for automatic variables. They are
**      guaranteed to be at least 16 bits, though various architectures may
**      define them to be wider (e.g., 32 or even 64 bits). These types are
**      never valid for fields of a structure.
************************************************************************/
#if JS_BYTES_PER_INT >= 2
typedef int JSIntn;
typedef unsigned int JSUintn;
#else
# error 'sizeof(int)' not sufficient for platform use
#endif

/************************************************************************
** TYPES:       JSFloat64
** DESCRIPTION:
**  NSPR's floating point type is always 64 bits.
************************************************************************/
typedef double          JSFloat64;

/************************************************************************
** TYPES:       JSSize
** DESCRIPTION:
**  A type for representing the size of objects.
************************************************************************/
typedef size_t JSSize;

/************************************************************************
** TYPES:       JSPtrDiff
** DESCRIPTION:
**  A type for pointer difference. Variables of this type are suitable
**      for storing a pointer or pointer sutraction.
************************************************************************/
typedef ptrdiff_t JSPtrdiff;

/************************************************************************
** TYPES:       JSUptrdiff
** DESCRIPTION:
**  A type for pointer difference. Variables of this type are suitable
**      for storing a pointer or pointer sutraction.
************************************************************************/
#if JS_BYTES_PER_WORD == 8 && JS_BYTES_PER_LONG != 8
typedef JSUint64 JSUptrdiff;
#else
typedef unsigned long JSUptrdiff;
#endif

/************************************************************************
** TYPES:       JSBool
** DESCRIPTION:
**  Use JSBool for variables and parameter types. Use JS_FALSE and JS_TRUE
**      for clarity of target type in assignments and actual arguments. Use
**      'if (bool)', 'while (!bool)', '(bool) ? x : y' etc., to test booleans
**      just as you would C int-valued conditions.
************************************************************************/
typedef JSIntn JSBool;
#define JS_TRUE (JSIntn)1
#define JS_FALSE (JSIntn)0

/************************************************************************
** TYPES:       JSPackedBool
** DESCRIPTION:
**  Use JSPackedBool within structs where bitfields are not desireable
**      but minimum and consistent overhead matters.
************************************************************************/
typedef JSUint8 JSPackedBool;

/*
** A JSWord is an integer that is the same size as a void*
*/
#if JS_BYTES_PER_WORD == 8 && JS_BYTES_PER_LONG != 8
typedef JSInt64 JSWord;
typedef JSUint64 JSUword;
#else
typedef long JSWord;
typedef unsigned long JSUword;
#endif

#include "jsotypes.h"

/***********************************************************************
** MACROS:      JS_LIKELY
**              JS_UNLIKELY
** DESCRIPTION:
**      These macros allow you to give a hint to the compiler about branch
**      probability so that it can better optimize.  Use them like this:
**
**      if (JS_LIKELY(v == 1)) {
**          ... expected code path ...
**      }
**
**      if (JS_UNLIKELY(v == 0)) {
**          ... non-expected code path ...
**      }
**
***********************************************************************/
#if defined(__GNUC__) && (__GNUC__ > 2)

# define JS_LIKELY(x)   (__builtin_expect((x), 1))
# define JS_UNLIKELY(x) (__builtin_expect((x), 0))

#else

# define JS_LIKELY(x)   (x)
# define JS_UNLIKELY(x) (x)

#endif

/***********************************************************************
** MACROS:      JS_ARRAY_LENGTH
**              JS_ARRAY_END
** DESCRIPTION:
**      Macros to get the number of elements and the pointer to one past the
**      last element of a C array. Use them like this:
**
**      jschar buf[10], *s;
**      JSString *str;
**      ...
**      for (s = buf; s != JS_ARRAY_END(buf); ++s) *s = ...;
**      ...
**      str = JS_NewStringCopyN(cx, buf, JS_ARRAY_LENGTH(buf));
**      ...
**
***********************************************************************/

#define JS_ARRAY_LENGTH(array) (sizeof (array) / sizeof (array)[0])
#define JS_ARRAY_END(array)    ((array) + JS_ARRAY_LENGTH(array))

JS_END_EXTERN_C

#endif /* jstypes_h___ */