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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 and jsversion.h also should be included by every file.
// So include them here.
// XXX: including them 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"
#include "jsversion.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(t) t
# define JS_PUBLIC_DATA(t) t
# define JS_FRIEND_API(t) t
# define JS_FRIEND_DATA(t) t
#elif defined(EXPORT_JS_API) || defined(STATIC_EXPORTABLE_JS_API)
# define JS_PUBLIC_API(t) MOZ_EXPORT t
# define JS_PUBLIC_DATA(t) MOZ_EXPORT t
# define JS_FRIEND_API(t) MOZ_EXPORT t
# define JS_FRIEND_DATA(t) MOZ_EXPORT t
#else
# define JS_PUBLIC_API(t) MOZ_IMPORT_API t
# define JS_PUBLIC_DATA(t) MOZ_IMPORT_DATA t
# define JS_FRIEND_API(t) MOZ_IMPORT_API t
# define JS_FRIEND_DATA(t) MOZ_IMPORT_DATA t
#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 !defined(__clang__) && defined(__GNUC__) && (__GNUC__ < 6 || (__GNUC__ == 6 && __GNUC_MINOR__ <= 4))
#define JS_BROKEN_GCC_ATTRIBUTE_WARNING
#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))
#include "jscpucfg.h"
/*
* Define JS_64BIT iff we are building in an environment with 64-bit
* addresses.
*/
#ifdef _MSC_VER
# if defined(_M_X64) || defined(_M_AMD64)
# define JS_64BIT
# endif
#elif defined(__GNUC__)
# if defined(__x86_64__) || defined(__64BIT__)
# define JS_64BIT
# endif
#elif defined(__xlc__) || defined(__xlC__) /* IBM XL C/C++ */
# if defined(__64BIT__)
# define JS_64BIT
# endif
#else
# error "Implement me"
#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:
**
** char16_t buf[10];
** JSString* str;
** ...
** for (char16_t* 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))
#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 */
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