forked from mirrors/gecko-dev
faa5733d46
"mozilla/Attributes.h" was previously included for `MOZ_MUST_USE`. Differential Revision: https://phabricator.services.mozilla.com/D104984
141 lines
5 KiB
C++
141 lines
5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: set ts=8 sts=2 et sw=2 tw=80:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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** File: jstypes.h
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** Description: Definitions of NSPR's basic types
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**
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** Prototypes and macros used to make up for deficiencies in ANSI environments
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** that we have found.
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**
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** Since we do not wrap <stdlib.h> and all the other standard headers, authors
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** of portable code will not know in general that they need these definitions.
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** Instead of requiring these authors to find the dependent uses in their code
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** and take the following steps only in those C files, we take steps once here
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** for all C files.
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**/
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#ifndef jstypes_h
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#define jstypes_h
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#include "mozilla/Casting.h"
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#include "mozilla/Types.h"
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#include <stddef.h>
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#include <stdint.h>
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// jstypes.h is (or should be!) included by every file in SpiderMonkey.
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// js-config.h also should be included by every file. So include it here.
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// XXX: including it in js/RequiredDefines.h should be a better option, since
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// that is by definition the header file that should be included in all
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// SpiderMonkey code. However, Gecko doesn't do this! See bug 909576.
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#include "js-config.h"
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/*
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* The linkage of JS API functions differs depending on whether the file is
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* used within the JS library or not. Any source file within the JS
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* interpreter should define EXPORT_JS_API whereas any client of the library
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* should not. STATIC_JS_API is used to build JS as a static library.
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*/
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#if defined(STATIC_JS_API)
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# define JS_PUBLIC_API
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# define JS_PUBLIC_DATA
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# define JS_FRIEND_API
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# define JS_FRIEND_DATA
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#elif defined(EXPORT_JS_API) || defined(STATIC_EXPORTABLE_JS_API)
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# define JS_PUBLIC_API MOZ_EXPORT
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# define JS_PUBLIC_DATA MOZ_EXPORT
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# define JS_FRIEND_API MOZ_EXPORT
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# define JS_FRIEND_DATA MOZ_EXPORT
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#else
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# define JS_PUBLIC_API MOZ_IMPORT_API
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# define JS_PUBLIC_DATA MOZ_IMPORT_DATA
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# define JS_FRIEND_API MOZ_IMPORT_API
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# define JS_FRIEND_DATA MOZ_IMPORT_DATA
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#endif
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#if defined(_MSC_VER) && defined(_M_IX86)
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# define JS_FASTCALL __fastcall
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#elif defined(__GNUC__) && defined(__i386__)
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# define JS_FASTCALL __attribute__((fastcall))
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#else
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# define JS_FASTCALL
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# define JS_NO_FASTCALL
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#endif
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/***********************************************************************
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** MACROS: JS_BEGIN_MACRO
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** JS_END_MACRO
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** DESCRIPTION:
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** Macro body brackets so that macros with compound statement definitions
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** behave syntactically more like functions when called.
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***********************************************************************/
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#define JS_BEGIN_MACRO do {
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#define JS_END_MACRO \
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} \
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while (0)
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/***********************************************************************
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** FUNCTIONS: Bit
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** BitMask
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** DESCRIPTION:
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** Bit masking functions. XXX n must be <= 31 to be portable
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***********************************************************************/
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namespace js {
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constexpr uint32_t Bit(uint32_t n) { return uint32_t(1) << n; }
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constexpr uint32_t BitMask(uint32_t n) { return Bit(n) - 1; }
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} // namespace js
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/***********************************************************************
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** FUNCTIONS: HowMany
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** RoundUp
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** RoundDown
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** Round
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** DESCRIPTION:
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** Commonly used functions for operations on compatible types.
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***********************************************************************/
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namespace js {
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constexpr size_t HowMany(size_t x, size_t y) { return (x + y - 1) / y; }
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constexpr size_t RoundUp(size_t x, size_t y) { return HowMany(x, y) * y; }
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constexpr size_t RoundDown(size_t x, size_t y) { return (x / y) * y; }
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constexpr size_t Round(size_t x, size_t y) { return ((x + y / 2) / y) * y; }
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} // namespace js
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#if (defined(__SIZEOF_POINTER__) && __SIZEOF_POINTER__ == 8) || \
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(defined(UINTPTR_MAX) && UINTPTR_MAX == 0xFFFFFFFFFFFFFFFFu)
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# define JS_BITS_PER_WORD 64
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#else
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# define JS_BITS_PER_WORD 32
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#endif
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static_assert(sizeof(void*) == 8 ? JS_BITS_PER_WORD == 64
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: JS_BITS_PER_WORD == 32,
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"preprocessor and compiler must agree");
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/***********************************************************************
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** MACROS: JS_FUNC_TO_DATA_PTR
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** JS_DATA_TO_FUNC_PTR
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** DESCRIPTION:
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** Macros to convert between function and data pointers of the same
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** size. Use them like this:
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**
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** JSGetterOp nativeGetter;
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** JSObject* scriptedGetter;
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** ...
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** scriptedGetter = JS_FUNC_TO_DATA_PTR(JSObject*, nativeGetter);
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** ...
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** nativeGetter = JS_DATA_TO_FUNC_PTR(JSGetterOp, scriptedGetter);
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**
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***********************************************************************/
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#define JS_FUNC_TO_DATA_PTR(type, fun) (mozilla::BitwiseCast<type>(fun))
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#define JS_DATA_TO_FUNC_PTR(type, ptr) (mozilla::BitwiseCast<type>(ptr))
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#endif /* jstypes_h */
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