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v8config.h
Go to the documentation of this file.
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// Copyright 2013 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8CONFIG_H_
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#define V8CONFIG_H_
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// gcc 10 defines __cplusplus to "an unspecified value strictly larger than
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// 201703L" for its experimental -std=gnu++2a config.
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// TODO(leszeks): Change to `__cplusplus <= 202002L` once we only support
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// compilers with full C++20 support.
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#if __cplusplus <= 201703L
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#error "C++20 or later required."
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#endif
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#ifdef V8_GN_HEADER
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#if !__has_include("v8-gn.h"
)
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#error Missing v8-gn.h. The configuration for v8 is missing from the include \
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path. Add it with -I<path> to the command line
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#endif
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#include "v8-gn.h"
// NOLINT(build/include_directory)
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#endif
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#include <memory>
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// clang-format off
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// Platform headers for feature detection below.
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#if defined(__ANDROID__)
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# include <sys/cdefs.h>
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#elif defined(__APPLE__)
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# include <TargetConditionals.h>
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#elif defined(__linux__)
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# include <features.h>
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#elif defined(__MVS__)
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# include "zos-base.h"
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#endif
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// This macro allows to test for the version of the GNU C library (or
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// a compatible C library that masquerades as glibc). It evaluates to
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// 0 if libc is not GNU libc or compatible.
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// Use like:
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// #if V8_GLIBC_PREREQ(2, 3)
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// ...
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// #endif
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#if defined(__GLIBC__) && defined(__GLIBC_MINOR__)
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# define V8_GLIBC_PREREQ(major, minor) \
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((__GLIBC__ * 100 + __GLIBC_MINOR__) >= ((major) * 100 + (minor)))
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#else
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# define V8_GLIBC_PREREQ(major, minor) 0
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#endif
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// This macro allows to test for the version of the GNU C++ compiler.
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// Note that this also applies to compilers that masquerade as GCC,
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// for example clang and the Intel C++ compiler for Linux.
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// Use like:
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// #if V8_GNUC_PREREQ(4, 3, 1)
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// ...
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// #endif
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#if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__)
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# define V8_GNUC_PREREQ(major, minor, patchlevel) \
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((__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) >= \
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((major) * 10000 + (minor) * 100 + (patchlevel)))
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#elif defined(__GNUC__) && defined(__GNUC_MINOR__)
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# define V8_GNUC_PREREQ(major, minor, patchlevel) \
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((__GNUC__ * 10000 + __GNUC_MINOR__ * 100) >= \
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((major) * 10000 + (minor) * 100 + (patchlevel)))
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#else
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# define V8_GNUC_PREREQ(major, minor, patchlevel) 0
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#endif
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// -----------------------------------------------------------------------------
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// Operating system detection (host)
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//
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// V8_OS_ANDROID - Android
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// V8_OS_BSD - BSDish (macOS, Net/Free/Open/DragonFlyBSD)
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// V8_OS_CYGWIN - Cygwin
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// V8_OS_DRAGONFLYBSD - DragonFlyBSD
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// V8_OS_FREEBSD - FreeBSD
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// V8_OS_FUCHSIA - Fuchsia
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// V8_OS_LINUX - Linux (Android, ChromeOS, Linux, ...)
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// V8_OS_DARWIN - Darwin (macOS, iOS)
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// V8_OS_MACOS - macOS
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// V8_OS_IOS - iOS
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// V8_OS_TVOS - tvOS (also sets V8_OS_IOS)
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// V8_OS_NETBSD - NetBSD
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// V8_OS_OPENBSD - OpenBSD
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// V8_OS_POSIX - POSIX compatible (mostly everything except Windows)
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// V8_OS_QNX - QNX Neutrino
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// V8_OS_SOLARIS - Sun Solaris and OpenSolaris
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// V8_OS_STARBOARD - Starboard (platform abstraction for Cobalt)
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// V8_OS_AIX - AIX
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// V8_OS_WIN - Microsoft Windows
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// V8_OS_ZOS - z/OS
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#if defined(__ANDROID__)
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# define V8_OS_ANDROID 1
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# define V8_OS_LINUX 1
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# define V8_OS_POSIX 1
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# define V8_OS_STRING "android"
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#elif defined(__APPLE__)
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# define V8_OS_POSIX 1
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# define V8_OS_BSD 1
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# define V8_OS_DARWIN 1
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# if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
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# define V8_OS_IOS 1
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# define V8_OS_STRING "ios"
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# if defined(TARGET_OS_TV) && TARGET_OS_TV
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# define V8_OS_TVOS 1
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# endif
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# else
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# define V8_OS_MACOS 1
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# define V8_OS_STRING "macos"
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# endif
// defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
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#elif defined(__CYGWIN__)
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# define V8_OS_CYGWIN 1
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# define V8_OS_POSIX 1
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# define V8_OS_STRING "cygwin"
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#elif defined(__linux__)
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# define V8_OS_LINUX 1
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# define V8_OS_POSIX 1
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# define V8_OS_STRING "linux"
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#elif defined(__sun)
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# define V8_OS_POSIX 1
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# define V8_OS_SOLARIS 1
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# define V8_OS_STRING "sun"
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#elif defined(STARBOARD)
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# define V8_OS_STARBOARD 1
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# define V8_OS_STRING "starboard"
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#elif defined(_AIX)
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# define V8_OS_POSIX 1
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# define V8_OS_AIX 1
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# define V8_OS_STRING "aix"
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#elif defined(__FreeBSD__)
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# define V8_OS_BSD 1
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# define V8_OS_FREEBSD 1
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# define V8_OS_POSIX 1
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# define V8_OS_STRING "freebsd"
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#elif defined(__Fuchsia__)
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# define V8_OS_FUCHSIA 1
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# define V8_OS_POSIX 1
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# define V8_OS_STRING "fuchsia"
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#elif defined(__DragonFly__)
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# define V8_OS_BSD 1
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# define V8_OS_DRAGONFLYBSD 1
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# define V8_OS_POSIX 1
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# define V8_OS_STRING "dragonflybsd"
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#elif defined(__NetBSD__)
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# define V8_OS_BSD 1
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# define V8_OS_NETBSD 1
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# define V8_OS_POSIX 1
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# define V8_OS_STRING "netbsd"
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#elif defined(__OpenBSD__)
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# define V8_OS_BSD 1
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# define V8_OS_OPENBSD 1
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# define V8_OS_POSIX 1
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# define V8_OS_STRING "openbsd"
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#elif defined(__QNXNTO__)
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# define V8_OS_POSIX 1
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# define V8_OS_QNX 1
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# define V8_OS_STRING "qnx"
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#elif defined(_WIN32)
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# define V8_OS_WIN 1
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# define V8_OS_STRING "windows"
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#elif defined(__MVS__)
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# define V8_OS_POSIX 1
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# define V8_OS_ZOS 1
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# define V8_OS_STRING "zos"
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#endif
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// -----------------------------------------------------------------------------
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// Operating system detection (target)
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//
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// V8_TARGET_OS_ANDROID
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// V8_TARGET_OS_FUCHSIA
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// V8_TARGET_OS_IOS
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// V8_TARGET_OS_TVOS (also sets V8_TARGET_OS_IOS)
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// V8_TARGET_OS_LINUX
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// V8_TARGET_OS_MACOS
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// V8_TARGET_OS_WIN
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// V8_TARGET_OS_CHROMEOS
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//
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// If not set explicitly, these fall back to corresponding V8_OS_ values.
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#ifdef V8_HAVE_TARGET_OS
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// The target OS is provided, just check that at least one known value is set.
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# if !defined(V8_TARGET_OS_ANDROID) \
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&& !defined(V8_TARGET_OS_FUCHSIA) \
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&& !defined(V8_TARGET_OS_IOS) \
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&& !defined(V8_TARGET_OS_TVOS) \
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&& !defined(V8_TARGET_OS_LINUX) \
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&& !defined(V8_TARGET_OS_MACOS) \
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&& !defined(V8_TARGET_OS_WIN) \
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&& !defined(V8_TARGET_OS_CHROMEOS)
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# error No known target OS defined.
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# endif
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#else
// V8_HAVE_TARGET_OS
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# if defined(V8_TARGET_OS_ANDROID) \
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|| defined(V8_TARGET_OS_FUCHSIA) \
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|| defined(V8_TARGET_OS_IOS) \
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|| defined(V8_TARGET_OS_TVOS) \
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|| defined(V8_TARGET_OS_LINUX) \
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|| defined(V8_TARGET_OS_MACOS) \
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|| defined(V8_TARGET_OS_WIN) \
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|| defined(V8_TARGET_OS_CHROMEOS)
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# error A target OS is defined but V8_HAVE_TARGET_OS is unset.
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# endif
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// Fall back to the detected host OS.
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#ifdef V8_OS_ANDROID
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# define V8_TARGET_OS_ANDROID
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#endif
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#ifdef V8_OS_FUCHSIA
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# define V8_TARGET_OS_FUCHSIA
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#endif
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#ifdef V8_OS_IOS
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# define V8_TARGET_OS_IOS
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#endif
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#ifdef V8_OS_TVOS
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# define V8_TARGET_OS_TVOS
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#endif
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#ifdef V8_OS_LINUX
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# define V8_TARGET_OS_LINUX
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#endif
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#ifdef V8_OS_MACOS
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# define V8_TARGET_OS_MACOS
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#endif
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#ifdef V8_OS_WIN
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# define V8_TARGET_OS_WIN
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#endif
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#endif
// V8_HAVE_TARGET_OS
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#if defined(V8_TARGET_OS_ANDROID)
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# define V8_TARGET_OS_STRING "android"
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#elif defined(V8_TARGET_OS_FUCHSIA)
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# define V8_TARGET_OS_STRING "fuchsia"
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#elif defined(V8_TARGET_OS_IOS)
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# define V8_TARGET_OS_STRING "ios"
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#elif defined(V8_TARGET_OS_LINUX)
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# define V8_TARGET_OS_STRING "linux"
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#elif defined(V8_TARGET_OS_MACOS)
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# define V8_TARGET_OS_STRING "macos"
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#elif defined(V8_TARGET_OS_WINDOWS)
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# define V8_TARGET_OS_STRING "windows"
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#else
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# define V8_TARGET_OS_STRING "unknown"
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#endif
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// -----------------------------------------------------------------------------
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// C library detection
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//
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// V8_LIBC_MSVCRT - MSVC libc
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// V8_LIBC_BIONIC - Bionic libc
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// V8_LIBC_BSD - BSD libc derivate
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// V8_LIBC_GLIBC - GNU C library
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// V8_LIBC_UCLIBC - uClibc
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//
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// Note that testing for libc must be done using #if not #ifdef. For example,
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// to test for the GNU C library, use:
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// #if V8_LIBC_GLIBC
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// ...
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// #endif
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#if defined (_MSC_VER)
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# define V8_LIBC_MSVCRT 1
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#elif defined(__BIONIC__)
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# define V8_LIBC_BIONIC 1
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# define V8_LIBC_BSD 1
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#elif defined(__UCLIBC__)
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// Must test for UCLIBC before GLIBC, as UCLIBC pretends to be GLIBC.
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# define V8_LIBC_UCLIBC 1
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#elif defined(__GLIBC__) || defined(__GNU_LIBRARY__)
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# define V8_LIBC_GLIBC 1
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#else
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# define V8_LIBC_BSD V8_OS_BSD
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#endif
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// -----------------------------------------------------------------------------
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// Compiler detection
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//
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// V8_CC_GNU - GCC, or clang in gcc mode
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// V8_CC_INTEL - Intel C++
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// V8_CC_MINGW - Minimalist GNU for Windows
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// V8_CC_MINGW32 - Minimalist GNU for Windows (mingw32)
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// V8_CC_MINGW64 - Minimalist GNU for Windows (mingw-w64)
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// V8_CC_MSVC - Microsoft Visual C/C++, or clang in cl.exe mode
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//
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// C++11 feature detection
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//
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// Compiler-specific feature detection
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//
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// V8_HAS_ATTRIBUTE_ALWAYS_INLINE - __attribute__((always_inline))
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// supported
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// V8_HAS_ATTRIBUTE_CONSTINIT - __attribute__((require_constant_
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// initialization))
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// supported
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// V8_HAS_ATTRIBUTE_NONNULL - __attribute__((nonnull)) supported
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// V8_HAS_ATTRIBUTE_NOINLINE - __attribute__((noinline)) supported
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// V8_HAS_ATTRIBUTE_UNUSED - __attribute__((unused)) supported
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// V8_HAS_ATTRIBUTE_USED - __attribute__((used)) supported
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// V8_HAS_ATTRIBUTE_RETAIN - __attribute__((retain)) supported
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// V8_HAS_ATTRIBUTE_VISIBILITY - __attribute__((visibility)) supported
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// V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT - __attribute__((warn_unused_result))
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// supported
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// V8_HAS_CPP_ATTRIBUTE_NODISCARD - [[nodiscard]] supported
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// V8_HAS_CPP_ATTRIBUTE_NO_UNIQUE_ADDRESS
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// - [[no_unique_address]] supported
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// V8_HAS_CPP_ATTRIBUTE_LIFETIME_BOUND - [[clang::lifetimebound]] supported
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// V8_HAS_BUILTIN_ADD_OVERFLOW - __builtin_add_overflow() supported
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// V8_HAS_BUILTIN_BSWAP16 - __builtin_bswap16() supported
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// V8_HAS_BUILTIN_BSWAP32 - __builtin_bswap32() supported
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// V8_HAS_BUILTIN_BSWAP64 - __builtin_bswap64() supported
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// V8_HAS_BUILTIN_CLZ - __builtin_clz() supported
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// V8_HAS_BUILTIN_CTZ - __builtin_ctz() supported
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// V8_HAS_BUILTIN_EXPECT - __builtin_expect() supported
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// V8_HAS_BUILTIN_FRAME_ADDRESS - __builtin_frame_address() supported
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// V8_HAS_BUILTIN_MUL_OVERFLOW - __builtin_mul_overflow() supported
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// V8_HAS_BUILTIN_POPCOUNT - __builtin_popcount() supported
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// V8_HAS_BUILTIN_SADD_OVERFLOW - __builtin_sadd_overflow() supported
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// V8_HAS_BUILTIN_SMUL_OVERFLOW - __builtin_smul_overflow() supported
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// V8_HAS_BUILTIN_SSUB_OVERFLOW - __builtin_ssub_overflow() supported
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// V8_HAS_BUILTIN_SUB_OVERFLOW - __builtin_sub_overflow() supported
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// V8_HAS_BUILTIN_UADD_OVERFLOW - __builtin_uadd_overflow() supported
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// V8_HAS_COMPUTED_GOTO - computed goto/labels as values
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// supported
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// V8_HAS_DECLSPEC_NOINLINE - __declspec(noinline) supported
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// V8_HAS_DECLSPEC_SELECTANY - __declspec(selectany) supported
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// V8_HAS___FORCEINLINE - __forceinline supported
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//
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// Note that testing for compilers and/or features must be done using #if
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// not #ifdef. For example, to test for Intel C++ Compiler, use:
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// #if V8_CC_INTEL
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// ...
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// #endif
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#if defined(__has_cpp_attribute)
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#define V8_HAS_CPP_ATTRIBUTE(FEATURE) __has_cpp_attribute(FEATURE)
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#else
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#define V8_HAS_CPP_ATTRIBUTE(FEATURE) 0
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#endif
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#if defined(__clang__)
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#if defined(__GNUC__)
// Clang in gcc mode.
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# define V8_CC_GNU 1
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#endif
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# define V8_HAS_ATTRIBUTE_ALWAYS_INLINE (__has_attribute(always_inline))
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# define V8_HAS_ATTRIBUTE_CONSTINIT \
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(__has_attribute(require_constant_initialization))
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# define V8_HAS_ATTRIBUTE_CONST (__has_attribute(const))
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# define V8_HAS_ATTRIBUTE_NONNULL (__has_attribute(nonnull))
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# define V8_HAS_ATTRIBUTE_NOINLINE (__has_attribute(noinline))
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# define V8_HAS_ATTRIBUTE_UNUSED (__has_attribute(unused))
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# define V8_HAS_ATTRIBUTE_USED (__has_attribute(used))
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# define V8_HAS_ATTRIBUTE_RETAIN (__has_attribute(retain))
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# define V8_HAS_ATTRIBUTE_OPTNONE (__has_attribute(optnone))
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// Support for the "preserve_most" attribute is limited:
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// - 32-bit platforms do not implement it,
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// - component builds fail because _dl_runtime_resolve clobbers registers,
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// - we see crashes on arm64 on Windows (https://crbug.com/1409934), which can
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// hopefully be fixed in the future.
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// Additionally, the initial implementation in clang <= 16 overwrote the return
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// register(s) in the epilogue of a preserve_most function, so we only use
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// preserve_most in clang >= 17 (see https://reviews.llvm.org/D143425).
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#if (defined(_M_X64) || defined(__x86_64__)
/* x64 (everywhere) */
\
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|| ((defined(__AARCH64EL__) || defined(_M_ARM64))
/* arm64, but ... */
\
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&& !defined(_WIN32)))
/* not on windows */
\
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&& !defined(COMPONENT_BUILD)
/* no component build */
\
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&& __clang_major__ >= 17
/* clang >= 17 */
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# define V8_HAS_ATTRIBUTE_PRESERVE_MOST (__has_attribute(preserve_most))
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#endif
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# define V8_HAS_ATTRIBUTE_VISIBILITY (__has_attribute(visibility))
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# define V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT \
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(__has_attribute(warn_unused_result))
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# define V8_HAS_ATTRIBUTE_WEAK (__has_attribute(weak))
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# define V8_HAS_CPP_ATTRIBUTE_NODISCARD (V8_HAS_CPP_ATTRIBUTE(nodiscard))
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#if defined(V8_CC_MSVC)
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# define V8_HAS_CPP_ATTRIBUTE_NO_UNIQUE_ADDRESS \
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(V8_HAS_CPP_ATTRIBUTE(msvc::no_unique_address) || \
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V8_HAS_CPP_ATTRIBUTE(no_unique_address))
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#else
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# define V8_HAS_CPP_ATTRIBUTE_NO_UNIQUE_ADDRESS \
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(V8_HAS_CPP_ATTRIBUTE(no_unique_address))
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#endif
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# define V8_HAS_CPP_ATTRIBUTE_LIFETIME_BOUND (V8_HAS_CPP_ATTRIBUTE(clang::lifetimebound))
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# define V8_HAS_BUILTIN_ADD_OVERFLOW (__has_builtin(__builtin_add_overflow))
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# define V8_HAS_BUILTIN_ASSUME (__has_builtin(__builtin_assume))
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# define V8_HAS_BUILTIN_ASSUME_ALIGNED (__has_builtin(__builtin_assume_aligned))
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# define V8_HAS_BUILTIN_BSWAP16 (__has_builtin(__builtin_bswap16))
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# define V8_HAS_BUILTIN_BSWAP32 (__has_builtin(__builtin_bswap32))
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# define V8_HAS_BUILTIN_BSWAP64 (__has_builtin(__builtin_bswap64))
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# define V8_HAS_BUILTIN_CLZ (__has_builtin(__builtin_clz))
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# define V8_HAS_BUILTIN_CTZ (__has_builtin(__builtin_ctz))
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# define V8_HAS_BUILTIN_EXPECT (__has_builtin(__builtin_expect))
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# define V8_HAS_BUILTIN_FRAME_ADDRESS (__has_builtin(__builtin_frame_address))
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# define V8_HAS_BUILTIN_MUL_OVERFLOW (__has_builtin(__builtin_mul_overflow))
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# define V8_HAS_BUILTIN_POPCOUNT (__has_builtin(__builtin_popcount))
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# define V8_HAS_BUILTIN_SADD_OVERFLOW (__has_builtin(__builtin_sadd_overflow))
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# define V8_HAS_BUILTIN_SMUL_OVERFLOW (__has_builtin(__builtin_smul_overflow))
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# define V8_HAS_BUILTIN_SSUB_OVERFLOW (__has_builtin(__builtin_ssub_overflow))
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# define V8_HAS_BUILTIN_SUB_OVERFLOW (__has_builtin(__builtin_sub_overflow))
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# define V8_HAS_BUILTIN_UADD_OVERFLOW (__has_builtin(__builtin_uadd_overflow))
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# define V8_HAS_BUILTIN_UNREACHABLE (__has_builtin(__builtin_unreachable))
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// Clang has no __has_feature for computed gotos.
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// GCC doc: https://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html
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# define V8_HAS_COMPUTED_GOTO 1
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#elif defined(__GNUC__)
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# define V8_CC_GNU 1
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# if defined(__INTEL_COMPILER)
// Intel C++ also masquerades as GCC 3.2.0
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# define V8_CC_INTEL 1
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# endif
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# if defined(__MINGW32__)
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# define V8_CC_MINGW32 1
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# endif
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# if defined(__MINGW64__)
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# define V8_CC_MINGW64 1
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# endif
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# define V8_CC_MINGW (V8_CC_MINGW32 || V8_CC_MINGW64)
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// FYI: __has_builtin is only available with GCC 10 and later, so explicitly
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// check GCC version numbers to enable features. TODO(leszeks): Merge feature
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// enabling for GCC 10 and later into the Clang section above, and leave this
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// section for GCC 9 and earlier.
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// always_inline is available in gcc 4.0 but not very reliable until 4.4.
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// Works around "sorry, unimplemented: inlining failed" build errors with
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// older compilers.
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# define V8_HAS_ATTRIBUTE_ALWAYS_INLINE 1
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# define V8_HAS_ATTRIBUTE_NOINLINE 1
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# define V8_HAS_ATTRIBUTE_UNUSED 1
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# define V8_HAS_ATTRIBUTE_VISIBILITY 1
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# define V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT (!V8_CC_INTEL)
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# define V8_HAS_ATTRIBUTE_WEAK 1
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// [[nodiscard]] does not work together with with
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// __attribute__((visibility(""))) on GCC 7.4 which is why there is no define
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// for V8_HAS_CPP_ATTRIBUTE_NODISCARD. See https://crbug.com/v8/11707.
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# define V8_HAS_BUILTIN_ASSUME_ALIGNED 1
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# define V8_HAS_BUILTIN_CLZ 1
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# define V8_HAS_BUILTIN_CTZ 1
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# define V8_HAS_BUILTIN_EXPECT 1
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# define V8_HAS_BUILTIN_FRAME_ADDRESS 1
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# define V8_HAS_BUILTIN_POPCOUNT 1
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# define V8_HAS_BUILTIN_UNREACHABLE 1
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// GCC doc: https://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html
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#define V8_HAS_COMPUTED_GOTO 1
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#endif
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#if defined(_MSC_VER)
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# define V8_CC_MSVC 1
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# define V8_HAS_DECLSPEC_NOINLINE 1
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# define V8_HAS_DECLSPEC_SELECTANY 1
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# define V8_HAS___FORCEINLINE 1
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#endif
495
496
497
// -----------------------------------------------------------------------------
498
// Helper macros
499
500
// A macro used to make better inlining. Don't bother for debug builds.
501
// Use like:
502
// V8_INLINE int GetZero() { return 0; }
503
#if !defined(DEBUG) && V8_HAS_ATTRIBUTE_ALWAYS_INLINE
504
# define V8_INLINE inline __attribute__((always_inline))
505
#elif !defined(DEBUG) && V8_HAS___FORCEINLINE
506
# define V8_INLINE __forceinline
507
#else
508
# define V8_INLINE inline
509
#endif
510
511
// A macro to force better inlining of calls in a statement. Don't bother for
512
// debug builds.
513
// Use like:
514
// V8_INLINE_STATEMENT foo = bar(); // Will force inlining the bar() call.
515
#if !defined(DEBUG) && defined(__clang__) && V8_HAS_ATTRIBUTE_ALWAYS_INLINE
516
# define V8_INLINE_STATEMENT [[clang::always_inline]]
517
#else
518
# define V8_INLINE_STATEMENT
519
#endif
520
521
#if V8_HAS_BUILTIN_ASSUME
522
#ifdef DEBUG
523
// In debug mode, check assumptions in addition to adding annotations.
524
// This helps GCC (and maybe other compilers) figure out that certain
525
// situations are unreachable.
526
# define V8_ASSUME(condition) \
527
do { \
528
DCHECK(condition); \
529
__builtin_assume(condition); \
530
} while (false)
531
#else
// DEBUG
532
# define V8_ASSUME __builtin_assume
533
#endif
// DEBUG
534
#elif V8_HAS_BUILTIN_UNREACHABLE
535
# define V8_ASSUME(condition) \
536
do { \
537
DCHECK(condition); \
538
if (!(condition)) __builtin_unreachable(); \
539
} while (false)
540
#else
541
# define V8_ASSUME USE
542
#endif
543
544
// Prefer c++20 std::assume_aligned. Don't use it on MSVC though, because it's
545
// not happy with our large 4GB alignment values.
546
#if __cplusplus >= 202002L && defined(__cpp_lib_assume_aligned) && !V8_CC_MSVC
547
# define V8_ASSUME_ALIGNED(ptr, alignment) \
548
std::assume_aligned<(alignment)>(ptr)
549
#elif V8_HAS_BUILTIN_ASSUME_ALIGNED
550
# define V8_ASSUME_ALIGNED(ptr, alignment) \
551
__builtin_assume_aligned((ptr), (alignment))
552
#else
553
# define V8_ASSUME_ALIGNED(ptr, alignment) (ptr)
554
#endif
555
556
// A macro to mark functions whose values don't change (e.g. across calls)
557
// and thereby compiler is free to hoist and fold multiple calls together.
558
// Use like:
559
// V8_CONST int foo() { ... }
560
#if V8_HAS_ATTRIBUTE_CONST
561
# define V8_CONST __attribute__((const))
562
#else
563
# define V8_CONST
564
#endif
565
566
// A macro to mark a declaration as requiring constant initialization.
567
// Use like:
568
// int* foo V8_CONSTINIT;
569
#if V8_HAS_ATTRIBUTE_CONSTINIT
570
# define V8_CONSTINIT __attribute__((require_constant_initialization))
571
#else
572
# define V8_CONSTINIT
573
#endif
574
575
576
// A macro to mark specific arguments as non-null.
577
// Use like:
578
// int add(int* x, int y, int* z) V8_NONNULL(1, 3) { return *x + y + *z; }
579
#if V8_HAS_ATTRIBUTE_NONNULL
580
# define V8_NONNULL(...) __attribute__((nonnull(__VA_ARGS__)))
581
#else
582
# define V8_NONNULL(...)
/* NOT SUPPORTED */
583
#endif
584
585
586
// A macro used to tell the compiler to never inline a particular function.
587
// Use like:
588
// V8_NOINLINE int GetMinusOne() { return -1; }
589
#if V8_HAS_ATTRIBUTE_NOINLINE
590
# define V8_NOINLINE __attribute__((noinline))
591
#elif V8_HAS_DECLSPEC_NOINLINE
592
# define V8_NOINLINE __declspec(noinline)
593
#else
594
# define V8_NOINLINE
/* NOT SUPPORTED */
595
#endif
596
597
598
// A macro used to change the calling conventions to preserve all registers (no
599
// caller-saved registers). Use this for cold functions called from hot
600
// functions.
601
// Use like:
602
// V8_NOINLINE V8_PRESERVE_MOST void UnlikelyMethod();
603
#if V8_HAS_ATTRIBUTE_PRESERVE_MOST
604
# define V8_PRESERVE_MOST __attribute__((preserve_most))
605
#else
606
# define V8_PRESERVE_MOST
/* NOT SUPPORTED */
607
#endif
608
609
610
// A macro (V8_DEPRECATED) to mark classes or functions as deprecated.
611
#if defined(V8_DEPRECATION_WARNINGS)
612
# define V8_DEPRECATED(message) [[deprecated(message)]]
613
#else
614
# define V8_DEPRECATED(message)
615
#endif
616
617
618
// A macro (V8_DEPRECATE_SOON) to make it easier to see what will be deprecated.
619
#if defined(V8_IMMINENT_DEPRECATION_WARNINGS)
620
# define V8_DEPRECATE_SOON(message) [[deprecated(message)]]
621
#else
622
# define V8_DEPRECATE_SOON(message)
623
#endif
624
625
626
#if defined(V8_IMMINENT_DEPRECATION_WARNINGS) || \
627
defined(V8_DEPRECATION_WARNINGS)
628
#if defined(V8_CC_MSVC)
629
# define START_ALLOW_USE_DEPRECATED() \
630
__pragma(warning(push)) \
631
__pragma(warning(disable : 4996))
632
# define END_ALLOW_USE_DEPRECATED() __pragma(warning(pop))
633
#else
// !defined(V8_CC_MSVC)
634
# define START_ALLOW_USE_DEPRECATED() \
635
_Pragma("GCC diagnostic push"
) \
636
_Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
637
#define END_ALLOW_USE_DEPRECATED() _Pragma("GCC diagnostic pop"
)
638
#endif
// !defined(V8_CC_MSVC)
639
#else
// !(defined(V8_IMMINENT_DEPRECATION_WARNINGS) ||
640
// defined(V8_DEPRECATION_WARNINGS))
641
#define START_ALLOW_USE_DEPRECATED()
642
#define END_ALLOW_USE_DEPRECATED()
643
#endif
// !(defined(V8_IMMINENT_DEPRECATION_WARNINGS) ||
644
// defined(V8_DEPRECATION_WARNINGS))
645
#define ALLOW_COPY_AND_MOVE_WITH_DEPRECATED_FIELDS(ClassName) \
646
START_ALLOW_USE_DEPRECATED() \
647
ClassName(const ClassName&) = default; \
648
ClassName(ClassName&&) = default; \
649
ClassName& operator=(const ClassName&) = default; \
650
ClassName& operator=(ClassName&&) = default; \
651
END_ALLOW_USE_DEPRECATED()
652
653
654
#if defined(__GNUC__) && !defined(__clang__) && (__GNUC__ < 6)
655
# define V8_ENUM_DEPRECATED(message)
656
# define V8_ENUM_DEPRECATE_SOON(message)
657
#else
658
# define V8_ENUM_DEPRECATED(message) V8_DEPRECATED(message)
659
# define V8_ENUM_DEPRECATE_SOON(message) V8_DEPRECATE_SOON(message)
660
#endif
661
662
663
// A macro to provide the compiler with branch prediction information.
664
#if V8_HAS_BUILTIN_EXPECT
665
# define V8_UNLIKELY(condition) (__builtin_expect(!!(condition), 0))
666
# define V8_LIKELY(condition) (__builtin_expect(!!(condition), 1))
667
#else
668
# define V8_UNLIKELY(condition) (condition)
669
# define V8_LIKELY(condition) (condition)
670
#endif
671
672
673
// Annotate a function indicating the caller must examine the return value.
674
// Use like:
675
// int foo() V8_WARN_UNUSED_RESULT;
676
#if V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT
677
#define V8_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
678
#else
679
#define V8_WARN_UNUSED_RESULT
/* NOT SUPPORTED */
680
#endif
681
682
683
// Annotate functions/variables as weak to allow overriding the symbol.
684
#if V8_HAS_ATTRIBUTE_WEAK
685
#define V8_WEAK __attribute__((weak))
686
#else
687
#define V8_WEAK
/* NOT SUPPORTED */
688
#endif
689
690
691
// Annotate a class or constructor indicating the caller must assign the
692
// constructed instances.
693
// Apply to the whole class like:
694
// class V8_NODISCARD Foo() { ... };
695
// or apply to just one constructor like:
696
// V8_NODISCARD Foo() { ... };
697
// [[nodiscard]] comes in C++17 but supported in clang with -std >= c++11.
698
#if V8_HAS_CPP_ATTRIBUTE_NODISCARD
699
#define V8_NODISCARD [[nodiscard]]
700
#else
701
#define V8_NODISCARD
/* NOT SUPPORTED */
702
#endif
703
704
705
// Annotate a function to ensure the function is retained in the compiled binary
706
// even if it appears to be unused to the compiler.
707
#if V8_HAS_ATTRIBUTE_USED && V8_HAS_ATTRIBUTE_VISIBILITY
708
#define V8_SYMBOL_USED \
709
__attribute__((used, visibility("default"
)))
710
#else
711
#define V8_SYMBOL_USED
/* NOT SUPPORTED */
712
#endif
713
714
715
// The no_unique_address attribute allows tail padding in a non-static data
716
// member to overlap other members of the enclosing class (and in the special
717
// case when the type is empty, permits it to fully overlap other members). The
718
// field is laid out as if a base class were encountered at the corresponding
719
// point within the class (except that it does not share a vptr with the
720
// enclosing object).
721
//
722
// Apply to a data member like:
723
//
724
// class Foo {
725
// V8_NO_UNIQUE_ADDRESS Bar bar_;
726
// };
727
//
728
// [[no_unique_address]] comes in C++20 but supported in clang with
729
// -std >= c++11.
730
#if V8_HAS_CPP_ATTRIBUTE_NO_UNIQUE_ADDRESS
731
#if defined(V8_CC_MSVC) && V8_HAS_CPP_ATTRIBUTE(msvc::no_unique_address)
732
// Unfortunately MSVC ignores [[no_unique_address]] (see
733
// https://devblogs.microsoft.com/cppblog/msvc-cpp20-and-the-std-cpp20-switch/#msvc-extensions-and-abi),
734
// and clang-cl matches it for ABI compatibility reasons. We need to prefer
735
// [[msvc::no_unique_address]] when available if we actually want any effect.
736
#define V8_NO_UNIQUE_ADDRESS [[msvc::no_unique_address]]
737
#else
738
#define V8_NO_UNIQUE_ADDRESS [[no_unique_address]]
739
#endif
740
#else
741
#define V8_NO_UNIQUE_ADDRESS
/* NOT SUPPORTED */
742
#endif
743
744
// Annotates a pointer or reference parameter or return value for a member
745
// function as having lifetime intertwined with the instance on which the
746
// function is called. For parameters, the function is assumed to store the
747
// value into the called-on object, so if the referred-to object is later
748
// destroyed, the called-on object is also considered to be dangling. For return
749
// values, the value is assumed to point into the called-on object, so if that
750
// object is destroyed, the returned value is also considered to be dangling.
751
// Useful to diagnose some cases of lifetime errors.
752
//
753
// See also:
754
// https://clang.llvm.org/docs/AttributeReference.html#lifetimebound
755
//
756
// Usage:
757
// ```
758
// struct S {
759
// S(int* p V8_LIFETIME_BOUND);
760
// int* Get() V8_LIFETIME_BOUND;
761
// };
762
// S Func1() {
763
// int i = 0;
764
// // The following return will not compile; diagnosed as returning address
765
// // of a stack object.
766
// return S(&i);
767
// }
768
// int* Func2(int* p) {
769
// // The following return will not compile; diagnosed as returning address
770
// // of a local temporary.
771
// return S(p).Get();
772
// }
773
#if V8_HAS_CPP_ATTRIBUTE_LIFETIME_BOUND
774
#define V8_LIFETIME_BOUND [[clang::lifetimebound]]
775
#else
776
#define V8_LIFETIME_BOUND
/* NOT SUPPORTED */
777
#endif
778
779
// Marks a type as being eligible for the "trivial" ABI despite having a
780
// non-trivial destructor or copy/move constructor. Such types can be relocated
781
// after construction by simply copying their memory, which makes them eligible
782
// to be passed in registers. The canonical example is std::unique_ptr.
783
//
784
// Use with caution; this has some subtle effects on constructor/destructor
785
// ordering and will be very incorrect if the type relies on its address
786
// remaining constant. When used as a function argument (by value), the value
787
// may be constructed in the caller's stack frame, passed in a register, and
788
// then used and destructed in the callee's stack frame. A similar thing can
789
// occur when values are returned.
790
//
791
// TRIVIAL_ABI is not needed for types which have a trivial destructor and
792
// copy/move constructors, since those are automatically trivial by the ABI
793
// spec.
794
//
795
// It is also not likely to be effective on types too large to be passed in one
796
// or two registers on typical target ABIs.
797
//
798
// See also:
799
// https://clang.llvm.org/docs/AttributeReference.html#trivial-abi
800
// https://libcxx.llvm.org/docs/DesignDocs/UniquePtrTrivialAbi.html
801
#if defined(__clang__) && defined(__has_attribute)
802
#if __has_attribute(trivial_abi)
803
#define V8_TRIVIAL_ABI [[clang::trivial_abi]]
804
#define V8_HAS_ATTRIBUTE_TRIVIAL_ABI 1
805
#endif
// __has_attribute(trivial_abi)
806
#endif
// defined(__clang__) && defined(__has_attribute)
807
#if !defined(V8_TRIVIAL_ABI)
808
#define V8_TRIVIAL_ABI
809
#define V8_HAS_ATTRIBUTE_TRIVIAL_ABI 0
810
#endif
811
812
// Helper macro to define no_sanitize attributes only with clang.
813
#if defined(__clang__) && defined(__has_attribute)
814
#if __has_attribute(no_sanitize)
815
#define V8_CLANG_NO_SANITIZE(what) __attribute__((no_sanitize(what)))
816
#endif
817
#endif
818
#if !defined(V8_CLANG_NO_SANITIZE)
819
#define V8_CLANG_NO_SANITIZE(what)
820
#endif
821
822
// Exposing private symbols requires exposing public symbols too.
823
#ifdef BUILDING_V8_SHARED_PRIVATE
824
#define BUILDING_V8_SHARED
825
#endif
826
827
#if defined(BUILDING_V8_SHARED) && defined(USING_V8_SHARED)
828
#error Inconsistent build configuration: To build the V8 shared library \
829
set BUILDING_V8_SHARED, to include its headers for linking against the \
830
V8 shared library set USING_V8_SHARED.
831
#endif
832
833
#ifdef V8_OS_WIN
834
835
// Setup for Windows DLL export/import. When building the V8 DLL the
836
// BUILDING_V8_SHARED needs to be defined. When building a program which uses
837
// the V8 DLL USING_V8_SHARED needs to be defined. When either building the V8
838
// static library or building a program which uses the V8 static library neither
839
// BUILDING_V8_SHARED nor USING_V8_SHARED should be defined.
840
#ifdef BUILDING_V8_SHARED
841
# define V8_EXPORT __declspec(dllexport)
842
#elif USING_V8_SHARED
843
# define V8_EXPORT __declspec(dllimport)
844
#else
845
# define V8_EXPORT
846
#endif
// BUILDING_V8_SHARED
847
848
#else
// V8_OS_WIN
849
850
// Setup for Linux shared library export.
851
#if (V8_HAS_ATTRIBUTE_VISIBILITY && \
852
(defined(BUILDING_V8_SHARED) || USING_V8_SHARED))
853
# define V8_EXPORT __attribute__((visibility("default"
)))
854
#else
855
# define V8_EXPORT
856
# endif
// V8_HAS_ATTRIBUTE_VISIBILITY && ...
857
858
#endif
// V8_OS_WIN
859
860
// clang-format on
861
862
// Processor architecture detection. For more info on what's defined, see:
863
// http://msdn.microsoft.com/en-us/library/b0084kay.aspx
864
// http://www.agner.org/optimize/calling_conventions.pdf
865
// or with gcc, run: "echo | gcc -E -dM -"
866
// The V8_HOST_ARCH_* macros correspond to the architecture on which V8, as a
867
// virtual machine and compiler, runs. Don't confuse this with the architecture
868
// on which V8 is built.
869
#if defined(_M_X64) || defined(__x86_64__)
870
#define V8_HOST_ARCH_X64 1
871
#if defined(__x86_64__) && __SIZEOF_POINTER__ == 4
// Check for x32.
872
#define V8_HOST_ARCH_32_BIT 1
873
#else
874
#define V8_HOST_ARCH_64_BIT 1
875
#endif
876
#elif defined(_M_IX86) || defined(__i386__)
877
#define V8_HOST_ARCH_IA32 1
878
#define V8_HOST_ARCH_32_BIT 1
879
#elif defined(__AARCH64EL__) || defined(_M_ARM64)
880
#define V8_HOST_ARCH_ARM64 1
881
#define V8_HOST_ARCH_64_BIT 1
882
#elif defined(__ARMEL__)
883
#define V8_HOST_ARCH_ARM 1
884
#define V8_HOST_ARCH_32_BIT 1
885
#elif defined(__mips64)
886
#define V8_HOST_ARCH_MIPS64 1
887
#define V8_HOST_ARCH_64_BIT 1
888
#elif defined(__loongarch_lp64)
889
#define V8_HOST_ARCH_LOONG64 1
890
#define V8_HOST_ARCH_64_BIT 1
891
#elif defined(__PPC64__) || defined(_ARCH_PPC64)
892
#define V8_HOST_ARCH_PPC64 1
893
#define V8_HOST_ARCH_64_BIT 1
894
#elif defined(__s390x__)
895
#define V8_HOST_ARCH_S390X 1
896
#define V8_HOST_ARCH_64_BIT 1
897
#elif defined(__riscv) || defined(__riscv__)
898
#if __riscv_xlen == 64
899
#define V8_HOST_ARCH_RISCV64 1
900
#define V8_HOST_ARCH_64_BIT 1
901
#elif __riscv_xlen == 32
902
#define V8_HOST_ARCH_RISCV32 1
903
#define V8_HOST_ARCH_32_BIT 1
904
#else
905
#error "Cannot detect Riscv's bitwidth"
906
#endif
907
#else
908
#error "Host architecture was not detected as supported by v8"
909
#endif
910
911
// Target architecture detection. This corresponds to the architecture for which
912
// V8's JIT will generate code (the last stage of the canadian cross-compiler).
913
// The macros may be set externally. If not, detect in the same way as the host
914
// architecture, that is, target the native environment as presented by the
915
// compiler.
916
#if !V8_TARGET_ARCH_X64 && !V8_TARGET_ARCH_IA32 && !V8_TARGET_ARCH_ARM && \
917
!V8_TARGET_ARCH_ARM64 && !V8_TARGET_ARCH_MIPS64 && \
918
!V8_TARGET_ARCH_PPC64 && !V8_TARGET_ARCH_S390X && \
919
!V8_TARGET_ARCH_RISCV64 && !V8_TARGET_ARCH_LOONG64 && \
920
!V8_TARGET_ARCH_RISCV32
921
#if defined(_M_X64) || defined(__x86_64__)
922
#define V8_TARGET_ARCH_X64 1
923
#elif defined(_M_IX86) || defined(__i386__)
924
#define V8_TARGET_ARCH_IA32 1
925
#elif defined(__AARCH64EL__) || defined(_M_ARM64)
926
#define V8_TARGET_ARCH_ARM64 1
927
#elif defined(__ARMEL__)
928
#define V8_TARGET_ARCH_ARM 1
929
#elif defined(__mips64)
930
#define V8_TARGET_ARCH_MIPS64 1
931
#elif defined(__loongarch_lp64)
932
#define V8_TARGET_ARCH_LOONG64 1
933
#elif defined(_ARCH_PPC64)
934
#define V8_TARGET_ARCH_PPC64 1
935
#elif defined(__s390x__)
936
#define V8_TARGET_ARCH_S390X 1
937
#elif defined(__riscv) || defined(__riscv__)
938
#if __riscv_xlen == 64
939
#define V8_TARGET_ARCH_RISCV64 1
940
#elif __riscv_xlen == 32
941
#define V8_TARGET_ARCH_RISCV32 1
942
#endif
943
#else
944
#error Target architecture was not detected as supported by v8
945
#endif
946
#endif
947
948
// Determine architecture pointer size.
949
#if V8_TARGET_ARCH_IA32
950
#define V8_TARGET_ARCH_32_BIT 1
951
#elif V8_TARGET_ARCH_X64
952
#if !V8_TARGET_ARCH_32_BIT && !V8_TARGET_ARCH_64_BIT
953
#if defined(__x86_64__) && __SIZEOF_POINTER__ == 4
// Check for x32.
954
#define V8_TARGET_ARCH_32_BIT 1
955
#else
956
#define V8_TARGET_ARCH_64_BIT 1
957
#endif
958
#endif
959
#elif V8_TARGET_ARCH_ARM
960
#define V8_TARGET_ARCH_32_BIT 1
961
#elif V8_TARGET_ARCH_ARM64
962
#define V8_TARGET_ARCH_64_BIT 1
963
#elif V8_TARGET_ARCH_MIPS64
964
#define V8_TARGET_ARCH_64_BIT 1
965
#elif V8_TARGET_ARCH_LOONG64
966
#define V8_TARGET_ARCH_64_BIT 1
967
#elif V8_TARGET_ARCH_PPC64
968
#define V8_TARGET_ARCH_64_BIT 1
969
#elif V8_TARGET_ARCH_S390X
970
#define V8_TARGET_ARCH_64_BIT 1
971
#elif V8_TARGET_ARCH_RISCV64
972
#define V8_TARGET_ARCH_64_BIT 1
973
#elif V8_TARGET_ARCH_RISCV32
974
#define V8_TARGET_ARCH_32_BIT 1
975
#else
976
#error Unknown target architecture pointer size
977
#endif
978
979
// Check for supported combinations of host and target architectures.
980
#if V8_TARGET_ARCH_IA32 && !V8_HOST_ARCH_IA32
981
#error Target architecture ia32 is only supported on ia32 host
982
#endif
983
#if (V8_TARGET_ARCH_X64 && V8_TARGET_ARCH_64_BIT && \
984
!((V8_HOST_ARCH_X64 || V8_HOST_ARCH_ARM64) && V8_HOST_ARCH_64_BIT))
985
#error Target architecture x64 is only supported on x64 and arm64 host
986
#endif
987
#if (V8_TARGET_ARCH_X64 && V8_TARGET_ARCH_32_BIT && \
988
!(V8_HOST_ARCH_X64 && V8_HOST_ARCH_32_BIT))
989
#error Target architecture x32 is only supported on x64 host with x32 support
990
#endif
991
#if (V8_TARGET_ARCH_ARM && !(V8_HOST_ARCH_IA32 || V8_HOST_ARCH_ARM))
992
#error Target architecture arm is only supported on arm and ia32 host
993
#endif
994
#if (V8_TARGET_ARCH_ARM64 && !(V8_HOST_ARCH_X64 || V8_HOST_ARCH_ARM64))
995
#error Target architecture arm64 is only supported on arm64 and x64 host
996
#endif
997
#if (V8_TARGET_ARCH_MIPS64 && !(V8_HOST_ARCH_X64 || V8_HOST_ARCH_MIPS64))
998
#error Target architecture mips64 is only supported on mips64 and x64 host
999
#endif
1000
#if (V8_TARGET_ARCH_RISCV64 && \
1001
!(V8_HOST_ARCH_X64 || V8_HOST_ARCH_ARM64 || V8_HOST_ARCH_RISCV64))
1002
#error Target architecture riscv64 is only supported on riscv64, x64, and \
1003
arm64 host
1004
#endif
1005
#if (V8_TARGET_ARCH_RISCV32 && !(V8_HOST_ARCH_IA32 || V8_HOST_ARCH_RISCV32))
1006
#error Target architecture riscv32 is only supported on riscv32 and ia32 host
1007
#endif
1008
#if (V8_TARGET_ARCH_LOONG64 && !(V8_HOST_ARCH_X64 || V8_HOST_ARCH_LOONG64))
1009
#error Target architecture loong64 is only supported on loong64 and x64 host
1010
#endif
1011
1012
// Determine architecture endianness.
1013
#if V8_TARGET_ARCH_IA32
1014
#define V8_TARGET_LITTLE_ENDIAN 1
1015
#elif V8_TARGET_ARCH_X64
1016
#define V8_TARGET_LITTLE_ENDIAN 1
1017
#elif V8_TARGET_ARCH_ARM
1018
#define V8_TARGET_LITTLE_ENDIAN 1
1019
#elif V8_TARGET_ARCH_ARM64
1020
#define V8_TARGET_LITTLE_ENDIAN 1
1021
#elif V8_TARGET_ARCH_LOONG64
1022
#define V8_TARGET_LITTLE_ENDIAN 1
1023
#elif V8_TARGET_ARCH_MIPS64
1024
#if defined(__MIPSEB__) || defined(V8_TARGET_ARCH_MIPS64_BE)
1025
#define V8_TARGET_BIG_ENDIAN 1
1026
#else
1027
#define V8_TARGET_LITTLE_ENDIAN 1
1028
#endif
1029
#elif V8_TARGET_ARCH_PPC64
1030
#if V8_OS_AIX
1031
#define V8_TARGET_BIG_ENDIAN 1
1032
#else
1033
#define V8_TARGET_LITTLE_ENDIAN 1
1034
#endif
1035
#elif V8_TARGET_ARCH_S390X
1036
#if V8_TARGET_ARCH_S390X_LE_SIM
1037
#define V8_TARGET_LITTLE_ENDIAN 1
1038
#else
1039
#define V8_TARGET_BIG_ENDIAN 1
1040
#endif
1041
#elif V8_TARGET_ARCH_RISCV32 || V8_TARGET_ARCH_RISCV64
1042
#define V8_TARGET_LITTLE_ENDIAN 1
1043
#elif defined(__BYTE_ORDER__)
1044
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
1045
#define V8_TARGET_BIG_ENDIAN 1
1046
#else
1047
#define V8_TARGET_LITTLE_ENDIAN 1
1048
#endif
1049
#else
1050
#error Unknown target architecture endianness
1051
#endif
1052
1053
#undef V8_HAS_CPP_ATTRIBUTE
1054
1055
#if !defined(V8_STATIC_ROOTS)
1056
#define V8_STATIC_ROOTS_BOOL false
1057
#else
1058
#define V8_STATIC_ROOTS_BOOL true
1059
#endif
1060
#ifdef V8_TARGET_BIG_ENDIAN
1061
#define V8_TARGET_BIG_ENDIAN_BOOL true
1062
#else
1063
#define V8_TARGET_BIG_ENDIAN_BOOL false
1064
#endif
1065
1066
#endif
// V8CONFIG_H_