https://github.com/mozilla/gecko-dev
Tip revision: 4c3fe34f7f0e09fa0dc597e29b52629ad0d4164a authored by Dustin J. Mitchell on 23 August 2019, 12:32:02 UTC
Bug 1562686 - revert remaining unnecessary bit of bug 1187245; r=glandium a=tomprince
Bug 1562686 - revert remaining unnecessary bit of bug 1187245; r=glandium a=tomprince
Tip revision: 4c3fe34
jstypes.h
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* 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"
/*
* 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.
//
// This version-check is written such that the version-number mentioned below
// must be bumped every time a new gcc that *doesn't* fix this bug is released.
// (The gcc release that *fixes* this bug will trigger no warning, and we'll
// naturally stop bumping this number.) If you ever trigger this warning with
// the latest stable gcc, you have rs=jwalden to bump it to the next gcc minor
// or major version as needed, e.g. (8, 2, 0) to (8, 3, 0).
#if MOZ_IS_GCC
# if !MOZ_GCC_VERSION_AT_LEAST(8, 2, 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 {
#define JS_END_MACRO \
} \
while (0)
/***********************************************************************
** 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_ROUNDDOWN(x, y) (((x) / (y)) * (y))
#define JS_ROUND(x, y) ((((x) + (y) / 2) / (y)) * (y))
#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))
#endif /* jstypes_h */