File: jstypes.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: set ts=8 sts=4 et sw=4 tw=99:
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/*
** 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 "mozilla/Attributes.h"
#include "mozilla/Casting.h"
#include "mozilla/Types.h"

// jstypes.h is (or should be!) included by every file in SpiderMonkey.
// js-config.h also should be included by every file. So include it here.
// XXX: including it in js/RequiredDefines.h should be a better option, since
// that is by definition the header file that should be included in all
// SpiderMonkey code.  However, Gecko doesn't do this!  See bug 909576.
#include "js-config.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; }
**
**
***********************************************************************/

#define JS_EXTERN_API(type) extern MOZ_EXPORT type
#define JS_EXPORT_API(type) MOZ_EXPORT type
#define JS_EXPORT_DATA(type) MOZ_EXPORT type
#define JS_IMPORT_API(type) MOZ_IMPORT_API type
#define JS_IMPORT_DATA(type) MOZ_IMPORT_DATA type

/*
 * 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
#define JS_PUBLIC_DATA
#define JS_FRIEND_API
#define JS_FRIEND_DATA
#elif defined(EXPORT_JS_API) || defined(STATIC_EXPORTABLE_JS_API)
#define JS_PUBLIC_API MOZ_EXPORT
#define JS_PUBLIC_DATA MOZ_EXPORT
#define JS_FRIEND_API MOZ_EXPORT
#define JS_FRIEND_DATA MOZ_EXPORT
#else
#define JS_PUBLIC_API MOZ_IMPORT_API
#define JS_PUBLIC_DATA MOZ_IMPORT_DATA
#define JS_FRIEND_API MOZ_IMPORT_API
#define JS_FRIEND_DATA MOZ_IMPORT_DATA
#endif

#if defined(_MSC_VER) && defined(_M_IX86)
#define JS_FASTCALL __fastcall
#elif defined(__GNUC__) && defined(__i386__)
#define JS_FASTCALL __attribute__((fastcall))
#else
#define JS_FASTCALL
#define JS_NO_FASTCALL
#endif

// gcc is buggy and warns on our attempts to JS_PUBLIC_API our
// forward-declarations or explicit template instantiations.  See
// <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50044>.  Add a way to detect
// that so we can locally disable that warning.
#if MOZ_IS_GCC
#if MOZ_GCC_VERSION_AT_MOST(8, 0, 0)
#define JS_BROKEN_GCC_ATTRIBUTE_WARNING
#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)
#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_BIT
**              JS_BITMASK
** DESCRIPTION:
** Bit masking macros.  XXX n must be <= 31 to be portable
***********************************************************************/
#define JS_BIT(n) ((uint32_t)1 << (n))
#define JS_BITMASK(n) (JS_BIT(n) - 1)

/***********************************************************************
** MACROS:      JS_HOWMANY
**              JS_ROUNDUP
** 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_BITS_PER_BYTE 8
#define JS_BITS_PER_BYTE_LOG2 3

#if defined(JS_64BIT)
#define JS_BITS_PER_WORD 64
#else
#define JS_BITS_PER_WORD 32
#endif

/***********************************************************************
** MACROS:      JS_FUNC_TO_DATA_PTR
**              JS_DATA_TO_FUNC_PTR
** DESCRIPTION:
**      Macros to convert between function and data pointers of the same
**      size. Use them like this:
**
**      JSGetterOp nativeGetter;
**      JSObject* scriptedGetter;
**      ...
**      scriptedGetter = JS_FUNC_TO_DATA_PTR(JSObject*, nativeGetter);
**      ...
**      nativeGetter = JS_DATA_TO_FUNC_PTR(JSGetterOp, scriptedGetter);
**
***********************************************************************/

#define JS_FUNC_TO_DATA_PTR(type, fun) (mozilla::BitwiseCast<type>(fun))
#define JS_DATA_TO_FUNC_PTR(type, ptr) (mozilla::BitwiseCast<type>(ptr))

#ifdef __GNUC__
#define JS_EXTENSION __extension__
#define JS_EXTENSION_(s) __extension__({ s; })
#else
#define JS_EXTENSION
#define JS_EXTENSION_(s) s
#endif

#endif /* jstypes_h */