d7/dfc/v8config_8h_source.html

// Copyright 2013 the V8 project authors. All rights reserved.

// Use of this source code is governed by a BSD-style license that can be

// found in the LICENSE file.


#ifndef V8CONFIG_H_

#define V8CONFIG_H_


// clang-format off


// Platform headers for feature detection below.

#if defined(__ANDROID__)

# include <sys/cdefs.h>

#elif defined(__APPLE__)

# include <TargetConditionals.h>

#elif defined(__linux__)

# include <features.h>

#endif


// This macro allows to test for the version of the GNU C library (or

// a compatible C library that masquerades as glibc). It evaluates to

// 0 if libc is not GNU libc or compatible.

// Use like:

//  #if V8_GLIBC_PREREQ(2, 3)

//   ...

//  #endif

#if defined(__GLIBC__) && defined(__GLIBC_MINOR__)

# define V8_GLIBC_PREREQ(major, minor)

    ((__GLIBC__ * 100 + __GLIBC_MINOR__) >= ((major) * 100 + (minor)))

#else

# define V8_GLIBC_PREREQ(major, minor) 0

#endif


// This macro allows to test for the version of the GNU C++ compiler.

// Note that this also applies to compilers that masquerade as GCC,

// for example clang and the Intel C++ compiler for Linux.

// Use like:

//  #if V8_GNUC_PREREQ(4, 3, 1)

//   ...

//  #endif

#if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__)

# define V8_GNUC_PREREQ(major, minor, patchlevel)

    ((__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) >=

     ((major) * 10000 + (minor) * 100 + (patchlevel)))

#elif defined(__GNUC__) && defined(__GNUC_MINOR__)

# define V8_GNUC_PREREQ(major, minor, patchlevel)

    ((__GNUC__ * 10000 + __GNUC_MINOR__ * 100) >=

     ((major) * 10000 + (minor) * 100 + (patchlevel)))

#else

# define V8_GNUC_PREREQ(major, minor, patchlevel) 0

#endif


// -----------------------------------------------------------------------------

// Operating system detection (host)

//

//  V8_OS_ANDROID       - Android

//  V8_OS_BSD           - BSDish (Mac OS X, Net/Free/Open/DragonFlyBSD)

//  V8_OS_CYGWIN        - Cygwin

//  V8_OS_DRAGONFLYBSD  - DragonFlyBSD

//  V8_OS_FREEBSD       - FreeBSD

//  V8_OS_FUCHSIA       - Fuchsia

//  V8_OS_LINUX         - Linux

//  V8_OS_MACOSX        - Mac OS X

//  V8_OS_IOS           - iOS

//  V8_OS_NETBSD        - NetBSD

//  V8_OS_OPENBSD       - OpenBSD

//  V8_OS_POSIX         - POSIX compatible (mostly everything except Windows)

//  V8_OS_QNX           - QNX Neutrino

//  V8_OS_SOLARIS       - Sun Solaris and OpenSolaris

//  V8_OS_AIX           - AIX

//  V8_OS_WIN           - Microsoft Windows


#if defined(__ANDROID__)

# define V8_OS_ANDROID 1

# define V8_OS_LINUX 1

# define V8_OS_POSIX 1

#elif defined(__APPLE__)

# define V8_OS_BSD 1

# define V8_OS_MACOSX 1

# define V8_OS_POSIX 1

# if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE

#  define V8_OS_IOS 1

# endif  // defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE

#elif defined(__CYGWIN__)

# define V8_OS_CYGWIN 1

# define V8_OS_POSIX 1

#elif defined(__linux__)

# define V8_OS_LINUX 1

# define V8_OS_POSIX 1

#elif defined(__sun)

# define V8_OS_POSIX 1

# define V8_OS_SOLARIS 1

#elif defined(_AIX)

#define V8_OS_POSIX 1

#define V8_OS_AIX 1

#elif defined(__FreeBSD__)

# define V8_OS_BSD 1

# define V8_OS_FREEBSD 1

# define V8_OS_POSIX 1

#elif defined(__Fuchsia__)

# define V8_OS_FUCHSIA 1

# define V8_OS_POSIX 1

#elif defined(__DragonFly__)

# define V8_OS_BSD 1

# define V8_OS_DRAGONFLYBSD 1

# define V8_OS_POSIX 1

#elif defined(__NetBSD__)

# define V8_OS_BSD 1

# define V8_OS_NETBSD 1

# define V8_OS_POSIX 1

#elif defined(__OpenBSD__)

# define V8_OS_BSD 1

# define V8_OS_OPENBSD 1

# define V8_OS_POSIX 1

#elif defined(__QNXNTO__)

# define V8_OS_POSIX 1

# define V8_OS_QNX 1

#elif defined(_WIN32)

# define V8_OS_WIN 1

#endif


// -----------------------------------------------------------------------------

// Operating system detection (target)

//

//  V8_TARGET_OS_ANDROID

//  V8_TARGET_OS_FUCHSIA

//  V8_TARGET_OS_IOS

//  V8_TARGET_OS_LINUX

//  V8_TARGET_OS_MACOSX

//  V8_TARGET_OS_WIN

//

// If not set explicitly, these fall back to corresponding V8_OS_ values.


#ifdef V8_HAVE_TARGET_OS


// The target OS is provided, just check that at least one known value is set.

# if !defined(V8_TARGET_OS_ANDROID)

  && !defined(V8_TARGET_OS_FUCHSIA)

  && !defined(V8_TARGET_OS_IOS)

  && !defined(V8_TARGET_OS_LINUX)

  && !defined(V8_TARGET_OS_MACOSX)

  && !defined(V8_TARGET_OS_WIN)

#  error No known target OS defined.

# endif


#else  // V8_HAVE_TARGET_OS


# if defined(V8_TARGET_OS_ANDROID)

  || defined(V8_TARGET_OS_FUCHSIA)

  || defined(V8_TARGET_OS_IOS)

  || defined(V8_TARGET_OS_LINUX)

  || defined(V8_TARGET_OS_MACOSX)

  || defined(V8_TARGET_OS_WIN)

#  error A target OS is defined but V8_HAVE_TARGET_OS is unset.

# endif


// Fall back to the detected host OS.

#ifdef V8_OS_ANDROID

# define V8_TARGET_OS_ANDROID

#endif


#ifdef V8_OS_FUCHSIA

# define V8_TARGET_OS_FUCHSIA

#endif


#ifdef V8_OS_IOS

# define V8_TARGET_OS_IOS

#endif


#ifdef V8_OS_LINUX

# define V8_TARGET_OS_LINUX

#endif


#ifdef V8_OS_MACOSX

# define V8_TARGET_OS_MACOSX

#endif


#ifdef V8_OS_WIN

# define V8_TARGET_OS_WIN

#endif


#endif  // V8_HAVE_TARGET_OS


// -----------------------------------------------------------------------------

// C library detection

//

//  V8_LIBC_MSVCRT  - MSVC libc

//  V8_LIBC_BIONIC  - Bionic libc

//  V8_LIBC_BSD     - BSD libc derivate

//  V8_LIBC_GLIBC   - GNU C library

//  V8_LIBC_UCLIBC  - uClibc

//

// Note that testing for libc must be done using #if not #ifdef. For example,

// to test for the GNU C library, use:

//  #if V8_LIBC_GLIBC

//   ...

//  #endif


#if defined (_MSC_VER)

# define V8_LIBC_MSVCRT 1

#elif defined(__BIONIC__)

# define V8_LIBC_BIONIC 1

# define V8_LIBC_BSD 1

#elif defined(__UCLIBC__)

// Must test for UCLIBC before GLIBC, as UCLIBC pretends to be GLIBC.

# define V8_LIBC_UCLIBC 1

#elif defined(__GLIBC__) || defined(__GNU_LIBRARY__)

# define V8_LIBC_GLIBC 1

#else

# define V8_LIBC_BSD V8_OS_BSD

#endif


// -----------------------------------------------------------------------------

// Compiler detection

//

//  V8_CC_GNU     - GCC, or clang in gcc mode

//  V8_CC_INTEL   - Intel C++

//  V8_CC_MINGW   - Minimalist GNU for Windows

//  V8_CC_MINGW32 - Minimalist GNU for Windows (mingw32)

//  V8_CC_MINGW64 - Minimalist GNU for Windows (mingw-w64)

//  V8_CC_MSVC    - Microsoft Visual C/C++, or clang in cl.exe mode

//

// C++11 feature detection

//

// Compiler-specific feature detection

//

//  V8_HAS_ATTRIBUTE_ALWAYS_INLINE      - __attribute__((always_inline))

//                                        supported

//  V8_HAS_ATTRIBUTE_NONNULL            - __attribute__((nonnull)) supported

//  V8_HAS_ATTRIBUTE_NOINLINE           - __attribute__((noinline)) supported

//  V8_HAS_ATTRIBUTE_UNUSED             - __attribute__((unused)) supported

//  V8_HAS_ATTRIBUTE_VISIBILITY         - __attribute__((visibility)) supported

//  V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT - __attribute__((warn_unused_result))

//                                        supported

//  V8_HAS_BUILTIN_BSWAP16              - __builtin_bswap16() supported

//  V8_HAS_BUILTIN_BSWAP32              - __builtin_bswap32() supported

//  V8_HAS_BUILTIN_BSWAP64              - __builtin_bswap64() supported

//  V8_HAS_BUILTIN_CLZ                  - __builtin_clz() supported

//  V8_HAS_BUILTIN_CTZ                  - __builtin_ctz() supported

//  V8_HAS_BUILTIN_EXPECT               - __builtin_expect() supported

//  V8_HAS_BUILTIN_FRAME_ADDRESS        - __builtin_frame_address() supported

//  V8_HAS_BUILTIN_POPCOUNT             - __builtin_popcount() supported

//  V8_HAS_BUILTIN_SADD_OVERFLOW        - __builtin_sadd_overflow() supported

//  V8_HAS_BUILTIN_SSUB_OVERFLOW        - __builtin_ssub_overflow() supported

//  V8_HAS_BUILTIN_UADD_OVERFLOW        - __builtin_uadd_overflow() supported

//  V8_HAS_COMPUTED_GOTO                - computed goto/labels as values

//                                        supported

//  V8_HAS_DECLSPEC_NOINLINE            - __declspec(noinline) supported

//  V8_HAS_DECLSPEC_SELECTANY           - __declspec(selectany) supported

//  V8_HAS___FORCEINLINE                - __forceinline supported

//

// Note that testing for compilers and/or features must be done using #if

// not #ifdef. For example, to test for Intel C++ Compiler, use:

//  #if V8_CC_INTEL

//   ...

//  #endif


#if defined(__clang__)


#if defined(__GNUC__)  // Clang in gcc mode.

# define V8_CC_GNU 1

#endif


# define V8_HAS_ATTRIBUTE_ALWAYS_INLINE (__has_attribute(always_inline))

# define V8_HAS_ATTRIBUTE_NONNULL (__has_attribute(nonnull))

# define V8_HAS_ATTRIBUTE_NOINLINE (__has_attribute(noinline))

# define V8_HAS_ATTRIBUTE_UNUSED (__has_attribute(unused))

# define V8_HAS_ATTRIBUTE_VISIBILITY (__has_attribute(visibility))

# define V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT

    (__has_attribute(warn_unused_result))


# define V8_HAS_BUILTIN_ASSUME_ALIGNED (__has_builtin(__builtin_assume_aligned))

# define V8_HAS_BUILTIN_BSWAP16 (__has_builtin(__builtin_bswap16))

# define V8_HAS_BUILTIN_BSWAP32 (__has_builtin(__builtin_bswap32))

# define V8_HAS_BUILTIN_BSWAP64 (__has_builtin(__builtin_bswap64))

# define V8_HAS_BUILTIN_CLZ (__has_builtin(__builtin_clz))

# define V8_HAS_BUILTIN_CTZ (__has_builtin(__builtin_ctz))

# define V8_HAS_BUILTIN_EXPECT (__has_builtin(__builtin_expect))

# define V8_HAS_BUILTIN_FRAME_ADDRESS (__has_builtin(__builtin_frame_address))

# define V8_HAS_BUILTIN_POPCOUNT (__has_builtin(__builtin_popcount))

# define V8_HAS_BUILTIN_SADD_OVERFLOW (__has_builtin(__builtin_sadd_overflow))

# define V8_HAS_BUILTIN_SSUB_OVERFLOW (__has_builtin(__builtin_ssub_overflow))

# define V8_HAS_BUILTIN_UADD_OVERFLOW (__has_builtin(__builtin_uadd_overflow))


// Clang has no __has_feature for computed gotos.

// GCC doc: https://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html

# define V8_HAS_COMPUTED_GOTO 1


// Whether constexpr has full C++14 semantics, in particular that non-constexpr

// code is allowed as long as it's not executed for any constexpr instantiation.

# define V8_HAS_CXX14_CONSTEXPR 1


#elif defined(__GNUC__)


# define V8_CC_GNU 1

# if defined(__INTEL_COMPILER)  // Intel C++ also masquerades as GCC 3.2.0

#  define V8_CC_INTEL 1

# endif

# if defined(__MINGW32__)

#  define V8_CC_MINGW32 1

# endif

# if defined(__MINGW64__)

#  define V8_CC_MINGW64 1

# endif

# define V8_CC_MINGW (V8_CC_MINGW32 || V8_CC_MINGW64)


// always_inline is available in gcc 4.0 but not very reliable until 4.4.

// Works around "sorry, unimplemented: inlining failed" build errors with

// older compilers.

# define V8_HAS_ATTRIBUTE_ALWAYS_INLINE 1

# define V8_HAS_ATTRIBUTE_NOINLINE 1

# define V8_HAS_ATTRIBUTE_UNUSED 1

# define V8_HAS_ATTRIBUTE_VISIBILITY 1

# define V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT (!V8_CC_INTEL)


# define V8_HAS_BUILTIN_ASSUME_ALIGNED 1

# define V8_HAS_BUILTIN_CLZ 1

# define V8_HAS_BUILTIN_CTZ 1

# define V8_HAS_BUILTIN_EXPECT 1

# define V8_HAS_BUILTIN_FRAME_ADDRESS 1

# define V8_HAS_BUILTIN_POPCOUNT 1


// GCC doc: https://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html

#define V8_HAS_COMPUTED_GOTO 1


// Whether constexpr has full C++14 semantics, in particular that non-constexpr

// code is allowed as long as it's not executed for any constexpr instantiation.

// GCC only supports this since version 6.

# define V8_HAS_CXX14_CONSTEXPR (V8_GNUC_PREREQ(6, 0, 0))


#endif


#if defined(_MSC_VER)

# define V8_CC_MSVC 1


# define V8_HAS_DECLSPEC_NOINLINE 1

# define V8_HAS_DECLSPEC_SELECTANY 1


# define V8_HAS___FORCEINLINE 1


#endif


// -----------------------------------------------------------------------------

// Helper macros


// A macro used to make better inlining. Don't bother for debug builds.

// Use like:

//   V8_INLINE int GetZero() { return 0; }

#if !defined(DEBUG) && V8_HAS_ATTRIBUTE_ALWAYS_INLINE

# define V8_INLINE inline __attribute__((always_inline))

#elif !defined(DEBUG) && V8_HAS___FORCEINLINE

# define V8_INLINE __forceinline

#else

# define V8_INLINE inline

#endif


#if V8_HAS_BUILTIN_ASSUME_ALIGNED

# define V8_ASSUME_ALIGNED(ptr, alignment)

  __builtin_assume_aligned((ptr), (alignment))

#else

# define V8_ASSUME_ALIGNED(ptr, alignment) (ptr)

#endif


// A macro to mark specific arguments as non-null.

// Use like:

//   int add(int* x, int y, int* z) V8_NONNULL(1, 3) { return *x + y + *z; }

#if V8_HAS_ATTRIBUTE_NONNULL

# define V8_NONNULL(...) __attribute__((nonnull(__VA_ARGS__)))

#else

# define V8_NONNULL(...) /* NOT SUPPORTED */

#endif


// A macro used to tell the compiler to never inline a particular function.

// Use like:

//   V8_NOINLINE int GetMinusOne() { return -1; }

#if V8_HAS_ATTRIBUTE_NOINLINE

# define V8_NOINLINE __attribute__((noinline))

#elif V8_HAS_DECLSPEC_NOINLINE

# define V8_NOINLINE __declspec(noinline)

#else

# define V8_NOINLINE /* NOT SUPPORTED */

#endif


// A macro (V8_DEPRECATED) to mark classes or functions as deprecated.

#if defined(V8_DEPRECATION_WARNINGS)

# define V8_DEPRECATED(message) [[deprecated(message)]]

#else

# define V8_DEPRECATED(message)

#endif


// A macro (V8_DEPRECATE_SOON) to make it easier to see what will be deprecated.

#if defined(V8_IMMINENT_DEPRECATION_WARNINGS)

# define V8_DEPRECATE_SOON(message) [[deprecated(message)]]

#else

# define V8_DEPRECATE_SOON(message)

#endif


#if defined(__GNUC__) && !defined(__clang__) && (__GNUC__ < 6)

# define V8_ENUM_DEPRECATED(message)

# define V8_ENUM_DEPRECATE_SOON(message)

#else

# define V8_ENUM_DEPRECATED(message) V8_DEPRECATED(message)

# define V8_ENUM_DEPRECATE_SOON(message) V8_DEPRECATE_SOON(message)

#endif


// A macro to provide the compiler with branch prediction information.

#if V8_HAS_BUILTIN_EXPECT

# define V8_UNLIKELY(condition) (__builtin_expect(!!(condition), 0))

# define V8_LIKELY(condition) (__builtin_expect(!!(condition), 1))

#else

# define V8_UNLIKELY(condition) (condition)

# define V8_LIKELY(condition) (condition)

#endif


// Annotate a function indicating the caller must examine the return value.

// Use like:

//   int foo() V8_WARN_UNUSED_RESULT;

#if V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT

#define V8_WARN_UNUSED_RESULT __attribute__((warn_unused_result))

#else

#define V8_WARN_UNUSED_RESULT /* NOT SUPPORTED */

#endif


// Helper macro to define no_sanitize attributes only with clang.

#if defined(__clang__) && defined(__has_attribute)

#if __has_attribute(no_sanitize)

#define V8_CLANG_NO_SANITIZE(what) __attribute__((no_sanitize(what)))

#endif

#endif

#if !defined(V8_CLANG_NO_SANITIZE)

#define V8_CLANG_NO_SANITIZE(what)

#endif


#if defined(BUILDING_V8_SHARED) && defined(USING_V8_SHARED)

#error Inconsistent build configuration: To build the V8 shared library set

    BUILDING_V8_SHARED, to include its headers for linking against the V8

   shared library set USING_V8_SHARED.

#endif


#ifdef V8_OS_WIN


// Setup for Windows DLL export/import. When building the V8 DLL the

// BUILDING_V8_SHARED needs to be defined. When building a program which uses

// the V8 DLL USING_V8_SHARED needs to be defined. When either building the V8

// static library or building a program which uses the V8 static library neither

// BUILDING_V8_SHARED nor USING_V8_SHARED should be defined.

#ifdef BUILDING_V8_SHARED

# define V8_EXPORT __declspec(dllexport)

#elif USING_V8_SHARED

# define V8_EXPORT __declspec(dllimport)

#else

# define V8_EXPORT

#endif  // BUILDING_V8_SHARED


#else  // V8_OS_WIN


// Setup for Linux shared library export.

#if V8_HAS_ATTRIBUTE_VISIBILITY

# ifdef BUILDING_V8_SHARED

#  define V8_EXPORT __attribute__ ((visibility("default")))

# else

#  define V8_EXPORT

# endif

#else

# define V8_EXPORT

#endif


#endif  // V8_OS_WIN


// clang-format on


#endif  // V8CONFIG_H_