3b2552de14
GCC 7.4 has problems with combining [[nodiscard]] with
__attribute__((visibility(""))). Disable as there's enough compilation
coverage for clang to find issues.
Bug: v8:11707
Change-Id: I9e61463c4d11dbc3b03d458e2810206fb93de108
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2854737
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Santiago Aboy Solanes <solanes@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74262}
525 lines
17 KiB
C
525 lines
17 KiB
C
// 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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#ifdef V8_GN_HEADER
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#if __cplusplus >= 201703L && !__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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// 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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#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 (Mac OS X, 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
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// V8_OS_MACOSX - Mac OS X
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// V8_OS_IOS - 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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#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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#elif defined(__APPLE__)
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# define V8_OS_BSD 1
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# define V8_OS_MACOSX 1
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# define V8_OS_POSIX 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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# 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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#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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#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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#elif defined(STARBOARD)
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# define V8_OS_STARBOARD 1
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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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#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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#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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#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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#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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#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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#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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#elif defined(_WIN32)
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# define V8_OS_WIN 1
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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_LINUX
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// V8_TARGET_OS_MACOSX
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// V8_TARGET_OS_WIN
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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_LINUX) \
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&& !defined(V8_TARGET_OS_MACOSX) \
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&& !defined(V8_TARGET_OS_WIN)
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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_LINUX) \
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|| defined(V8_TARGET_OS_MACOSX) \
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|| defined(V8_TARGET_OS_WIN)
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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_LINUX
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# define V8_TARGET_OS_LINUX
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#endif
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#ifdef V8_OS_MACOSX
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# define V8_TARGET_OS_MACOSX
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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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// -----------------------------------------------------------------------------
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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_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_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_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_POPCOUNT - __builtin_popcount() supported
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// V8_HAS_BUILTIN_SADD_OVERFLOW - __builtin_sadd_overflow() supported
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// V8_HAS_BUILTIN_SSUB_OVERFLOW - __builtin_ssub_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_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_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_CPP_ATTRIBUTE_NODISCARD (V8_HAS_CPP_ATTRIBUTE(nodiscard))
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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_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_SSUB_OVERFLOW (__has_builtin(__builtin_ssub_overflow))
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# define V8_HAS_BUILTIN_UADD_OVERFLOW (__has_builtin(__builtin_uadd_overflow))
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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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// Whether constexpr has full C++14 semantics, in particular that non-constexpr
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// code is allowed as long as it's not executed for any constexpr instantiation.
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# define V8_HAS_CXX14_CONSTEXPR 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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// 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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// [[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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// 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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// Whether constexpr has full C++14 semantics, in particular that non-constexpr
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// code is allowed as long as it's not executed for any constexpr instantiation.
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// GCC only supports this since version 6.
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# define V8_HAS_CXX14_CONSTEXPR (V8_GNUC_PREREQ(6, 0, 0))
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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
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// -----------------------------------------------------------------------------
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// Helper macros
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// A macro used to make better inlining. Don't bother for debug builds.
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// Use like:
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// V8_INLINE int GetZero() { return 0; }
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#if !defined(DEBUG) && V8_HAS_ATTRIBUTE_ALWAYS_INLINE
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# define V8_INLINE inline __attribute__((always_inline))
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#elif !defined(DEBUG) && V8_HAS___FORCEINLINE
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# define V8_INLINE __forceinline
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#else
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# define V8_INLINE inline
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#endif
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#if V8_HAS_BUILTIN_ASSUME_ALIGNED
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# define V8_ASSUME_ALIGNED(ptr, alignment) \
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__builtin_assume_aligned((ptr), (alignment))
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#else
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# define V8_ASSUME_ALIGNED(ptr, alignment) (ptr)
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#endif
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// A macro to mark specific arguments as non-null.
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// Use like:
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// int add(int* x, int y, int* z) V8_NONNULL(1, 3) { return *x + y + *z; }
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#if V8_HAS_ATTRIBUTE_NONNULL
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# define V8_NONNULL(...) __attribute__((nonnull(__VA_ARGS__)))
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#else
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# define V8_NONNULL(...) /* NOT SUPPORTED */
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#endif
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// A macro used to tell the compiler to never inline a particular function.
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// Use like:
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// V8_NOINLINE int GetMinusOne() { return -1; }
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#if V8_HAS_ATTRIBUTE_NOINLINE
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# define V8_NOINLINE __attribute__((noinline))
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#elif V8_HAS_DECLSPEC_NOINLINE
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# define V8_NOINLINE __declspec(noinline)
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#else
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# define V8_NOINLINE /* NOT SUPPORTED */
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#endif
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// A macro (V8_DEPRECATED) to mark classes or functions as deprecated.
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#if defined(V8_DEPRECATION_WARNINGS)
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# define V8_DEPRECATED(message) [[deprecated(message)]]
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#else
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# define V8_DEPRECATED(message)
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#endif
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// A macro (V8_DEPRECATE_SOON) to make it easier to see what will be deprecated.
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#if defined(V8_IMMINENT_DEPRECATION_WARNINGS)
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# define V8_DEPRECATE_SOON(message) [[deprecated(message)]]
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#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
|
|
|
|
|
|
// Annotate a class or constructor indicating the caller must assign the
|
|
// constructed instances.
|
|
// Apply to the whole class like:
|
|
// class V8_NODISCARD Foo() { ... };
|
|
// or apply to just one constructor like:
|
|
// V8_NODISCARD Foo() { ... };
|
|
// [[nodiscard]] comes in C++17 but supported in clang with -std >= c++11.
|
|
#if V8_HAS_CPP_ATTRIBUTE_NODISCARD
|
|
#define V8_NODISCARD [[nodiscard]]
|
|
#else
|
|
#define V8_NODISCARD /* 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
|
|
|
|
#undef V8_HAS_CPP_ATTRIBUTE
|
|
|
|
#endif // V8CONFIG_H_
|