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v8/include/v8config.h
Omer Katz fff219bff7 heap,cppgc: Update StackState enum values 
This CL adds 2 new values to the EmbedderStackState enum with more
explicit names. The old values are updated as aliases to the new
values and marked as soon to be deprecated. This CL also moves the
enum to v8-platform.h so that it can be reused by cppgc.

Depracating individual values in an enum is supported by GCC only
since version 6. Thus new macros were needed for the deprecation
(which delegate to the existing macros when supported). GCC versions
older than 6 are still used by the CQ bots.

Bug: chromium:1056170
Change-Id: Id1ea73edfbbae282b0d8a3bb103dbbbf8ebd417e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2188971
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67744}
2020-05-12 12:07:27 +00:00

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// Copyright 2013 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8CONFIG_H_
#define V8CONFIG_H_
// clang-format off
// Platform headers for feature detection below.
#if defined(__ANDROID__)
# include <sys/cdefs.h>
#elif defined(__APPLE__)
# include <TargetConditionals.h>
#elif defined(__linux__)
# include <features.h>
#endif
// This macro allows to test for the version of the GNU C library (or
// a compatible C library that masquerades as glibc). It evaluates to
// 0 if libc is not GNU libc or compatible.
// Use like:
// #if V8_GLIBC_PREREQ(2, 3)
// ...
// #endif
#if defined(__GLIBC__) && defined(__GLIBC_MINOR__)
# define V8_GLIBC_PREREQ(major, minor) \
((__GLIBC__ * 100 + __GLIBC_MINOR__) >= ((major) * 100 + (minor)))
#else
# define V8_GLIBC_PREREQ(major, minor) 0
#endif
// This macro allows to test for the version of the GNU C++ compiler.
// Note that this also applies to compilers that masquerade as GCC,
// for example clang and the Intel C++ compiler for Linux.
// Use like:
// #if V8_GNUC_PREREQ(4, 3, 1)
// ...
// #endif
#if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__)
# define V8_GNUC_PREREQ(major, minor, patchlevel) \
((__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) >= \
((major) * 10000 + (minor) * 100 + (patchlevel)))
#elif defined(__GNUC__) && defined(__GNUC_MINOR__)
# define V8_GNUC_PREREQ(major, minor, patchlevel) \
((__GNUC__ * 10000 + __GNUC_MINOR__ * 100) >= \
((major) * 10000 + (minor) * 100 + (patchlevel)))
#else
# define V8_GNUC_PREREQ(major, minor, patchlevel) 0
#endif
// -----------------------------------------------------------------------------
// Operating system detection (host)
//
// V8_OS_ANDROID - Android
// V8_OS_BSD - BSDish (Mac OS X, Net/Free/Open/DragonFlyBSD)
// V8_OS_CYGWIN - Cygwin
// V8_OS_DRAGONFLYBSD - DragonFlyBSD
// V8_OS_FREEBSD - FreeBSD
// V8_OS_FUCHSIA - Fuchsia
// V8_OS_LINUX - Linux
// V8_OS_MACOSX - Mac OS X
// V8_OS_IOS - iOS
// V8_OS_NETBSD - NetBSD
// V8_OS_OPENBSD - OpenBSD
// V8_OS_POSIX - POSIX compatible (mostly everything except Windows)
// V8_OS_QNX - QNX Neutrino
// V8_OS_SOLARIS - Sun Solaris and OpenSolaris
// V8_OS_AIX - AIX
// V8_OS_WIN - Microsoft Windows
#if defined(__ANDROID__)
# define V8_OS_ANDROID 1
# define V8_OS_LINUX 1
# define V8_OS_POSIX 1
#elif defined(__APPLE__)
# define V8_OS_BSD 1
# define V8_OS_MACOSX 1
# define V8_OS_POSIX 1
# if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
# define V8_OS_IOS 1
# endif // defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
#elif defined(__CYGWIN__)
# define V8_OS_CYGWIN 1
# define V8_OS_POSIX 1
#elif defined(__linux__)
# define V8_OS_LINUX 1
# define V8_OS_POSIX 1
#elif defined(__sun)
# define V8_OS_POSIX 1
# define V8_OS_SOLARIS 1
#elif defined(_AIX)
#define V8_OS_POSIX 1
#define V8_OS_AIX 1
#elif defined(__FreeBSD__)
# define V8_OS_BSD 1
# define V8_OS_FREEBSD 1
# define V8_OS_POSIX 1
#elif defined(__Fuchsia__)
# define V8_OS_FUCHSIA 1
# define V8_OS_POSIX 1
#elif defined(__DragonFly__)
# define V8_OS_BSD 1
# define V8_OS_DRAGONFLYBSD 1
# define V8_OS_POSIX 1
#elif defined(__NetBSD__)
# define V8_OS_BSD 1
# define V8_OS_NETBSD 1
# define V8_OS_POSIX 1
#elif defined(__OpenBSD__)
# define V8_OS_BSD 1
# define V8_OS_OPENBSD 1
# define V8_OS_POSIX 1
#elif defined(__QNXNTO__)
# define V8_OS_POSIX 1
# define V8_OS_QNX 1
#elif defined(_WIN32)
# define V8_OS_WIN 1
#endif
// -----------------------------------------------------------------------------
// Operating system detection (target)
//
// V8_TARGET_OS_ANDROID
// V8_TARGET_OS_FUCHSIA
// V8_TARGET_OS_IOS
// V8_TARGET_OS_LINUX
// V8_TARGET_OS_MACOSX
// V8_TARGET_OS_WIN
//
// If not set explicitly, these fall back to corresponding V8_OS_ values.
#ifdef V8_HAVE_TARGET_OS
// The target OS is provided, just check that at least one known value is set.
# if !defined(V8_TARGET_OS_ANDROID) \
&& !defined(V8_TARGET_OS_FUCHSIA) \
&& !defined(V8_TARGET_OS_IOS) \
&& !defined(V8_TARGET_OS_LINUX) \
&& !defined(V8_TARGET_OS_MACOSX) \
&& !defined(V8_TARGET_OS_WIN)
# error No known target OS defined.
# endif
#else // V8_HAVE_TARGET_OS
# if defined(V8_TARGET_OS_ANDROID) \
|| defined(V8_TARGET_OS_FUCHSIA) \
|| defined(V8_TARGET_OS_IOS) \
|| defined(V8_TARGET_OS_LINUX) \
|| defined(V8_TARGET_OS_MACOSX) \
|| defined(V8_TARGET_OS_WIN)
# error A target OS is defined but V8_HAVE_TARGET_OS is unset.
# endif
// Fall back to the detected host OS.
#ifdef V8_OS_ANDROID
# define V8_TARGET_OS_ANDROID
#endif
#ifdef V8_OS_FUCHSIA
# define V8_TARGET_OS_FUCHSIA
#endif
#ifdef V8_OS_IOS
# define V8_TARGET_OS_IOS
#endif
#ifdef V8_OS_LINUX
# define V8_TARGET_OS_LINUX
#endif
#ifdef V8_OS_MACOSX
# define V8_TARGET_OS_MACOSX
#endif
#ifdef V8_OS_WIN
# define V8_TARGET_OS_WIN
#endif
#endif // V8_HAVE_TARGET_OS
// -----------------------------------------------------------------------------
// C library detection
//
// V8_LIBC_MSVCRT - MSVC libc
// V8_LIBC_BIONIC - Bionic libc
// V8_LIBC_BSD - BSD libc derivate
// V8_LIBC_GLIBC - GNU C library
// V8_LIBC_UCLIBC - uClibc
//
// Note that testing for libc must be done using #if not #ifdef. For example,
// to test for the GNU C library, use:
// #if V8_LIBC_GLIBC
// ...
// #endif
#if defined (_MSC_VER)
# define V8_LIBC_MSVCRT 1
#elif defined(__BIONIC__)
# define V8_LIBC_BIONIC 1
# define V8_LIBC_BSD 1
#elif defined(__UCLIBC__)
// Must test for UCLIBC before GLIBC, as UCLIBC pretends to be GLIBC.
# define V8_LIBC_UCLIBC 1
#elif defined(__GLIBC__) || defined(__GNU_LIBRARY__)
# define V8_LIBC_GLIBC 1
#else
# define V8_LIBC_BSD V8_OS_BSD
#endif
// -----------------------------------------------------------------------------
// Compiler detection
//
// V8_CC_GNU - GCC, or clang in gcc mode
// V8_CC_INTEL - Intel C++
// V8_CC_MINGW - Minimalist GNU for Windows
// V8_CC_MINGW32 - Minimalist GNU for Windows (mingw32)
// V8_CC_MINGW64 - Minimalist GNU for Windows (mingw-w64)
// V8_CC_MSVC - Microsoft Visual C/C++, or clang in cl.exe mode
//
// C++11 feature detection
//
// Compiler-specific feature detection
//
// V8_HAS_ATTRIBUTE_ALWAYS_INLINE - __attribute__((always_inline))
// supported
// V8_HAS_ATTRIBUTE_NONNULL - __attribute__((nonnull)) supported
// V8_HAS_ATTRIBUTE_NOINLINE - __attribute__((noinline)) supported
// V8_HAS_ATTRIBUTE_UNUSED - __attribute__((unused)) supported
// V8_HAS_ATTRIBUTE_VISIBILITY - __attribute__((visibility)) supported
// V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT - __attribute__((warn_unused_result))
// supported
// V8_HAS_BUILTIN_BSWAP16 - __builtin_bswap16() supported
// V8_HAS_BUILTIN_BSWAP32 - __builtin_bswap32() supported
// V8_HAS_BUILTIN_BSWAP64 - __builtin_bswap64() supported
// V8_HAS_BUILTIN_CLZ - __builtin_clz() supported
// V8_HAS_BUILTIN_CTZ - __builtin_ctz() supported
// V8_HAS_BUILTIN_EXPECT - __builtin_expect() supported
// V8_HAS_BUILTIN_FRAME_ADDRESS - __builtin_frame_address() supported
// V8_HAS_BUILTIN_POPCOUNT - __builtin_popcount() supported
// V8_HAS_BUILTIN_SADD_OVERFLOW - __builtin_sadd_overflow() supported
// V8_HAS_BUILTIN_SSUB_OVERFLOW - __builtin_ssub_overflow() supported
// V8_HAS_BUILTIN_UADD_OVERFLOW - __builtin_uadd_overflow() supported
// V8_HAS_COMPUTED_GOTO - computed goto/labels as values
// supported
// V8_HAS_DECLSPEC_NOINLINE - __declspec(noinline) supported
// V8_HAS_DECLSPEC_SELECTANY - __declspec(selectany) supported
// V8_HAS___FORCEINLINE - __forceinline supported
//
// Note that testing for compilers and/or features must be done using #if
// not #ifdef. For example, to test for Intel C++ Compiler, use:
// #if V8_CC_INTEL
// ...
// #endif
#if defined(__clang__)
#if defined(__GNUC__) // Clang in gcc mode.
# define V8_CC_GNU 1
#endif
# define V8_HAS_ATTRIBUTE_ALWAYS_INLINE (__has_attribute(always_inline))
# define V8_HAS_ATTRIBUTE_NONNULL (__has_attribute(nonnull))
# define V8_HAS_ATTRIBUTE_NOINLINE (__has_attribute(noinline))
# define V8_HAS_ATTRIBUTE_UNUSED (__has_attribute(unused))
# define V8_HAS_ATTRIBUTE_VISIBILITY (__has_attribute(visibility))
# define V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT \
(__has_attribute(warn_unused_result))
# define V8_HAS_BUILTIN_ASSUME_ALIGNED (__has_builtin(__builtin_assume_aligned))
# define V8_HAS_BUILTIN_BSWAP16 (__has_builtin(__builtin_bswap16))
# define V8_HAS_BUILTIN_BSWAP32 (__has_builtin(__builtin_bswap32))
# define V8_HAS_BUILTIN_BSWAP64 (__has_builtin(__builtin_bswap64))
# define V8_HAS_BUILTIN_CLZ (__has_builtin(__builtin_clz))
# define V8_HAS_BUILTIN_CTZ (__has_builtin(__builtin_ctz))
# define V8_HAS_BUILTIN_EXPECT (__has_builtin(__builtin_expect))
# define V8_HAS_BUILTIN_FRAME_ADDRESS (__has_builtin(__builtin_frame_address))
# define V8_HAS_BUILTIN_POPCOUNT (__has_builtin(__builtin_popcount))
# define V8_HAS_BUILTIN_SADD_OVERFLOW (__has_builtin(__builtin_sadd_overflow))
# define V8_HAS_BUILTIN_SSUB_OVERFLOW (__has_builtin(__builtin_ssub_overflow))
# define V8_HAS_BUILTIN_UADD_OVERFLOW (__has_builtin(__builtin_uadd_overflow))
// Clang has no __has_feature for computed gotos.
// GCC doc: https://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html
# define V8_HAS_COMPUTED_GOTO 1
// Whether constexpr has full C++14 semantics, in particular that non-constexpr
// code is allowed as long as it's not executed for any constexpr instantiation.
# define V8_HAS_CXX14_CONSTEXPR 1
#elif defined(__GNUC__)
# define V8_CC_GNU 1
# if defined(__INTEL_COMPILER) // Intel C++ also masquerades as GCC 3.2.0
# define V8_CC_INTEL 1
# endif
# if defined(__MINGW32__)
# define V8_CC_MINGW32 1
# endif
# if defined(__MINGW64__)
# define V8_CC_MINGW64 1
# endif
# define V8_CC_MINGW (V8_CC_MINGW32 || V8_CC_MINGW64)
// always_inline is available in gcc 4.0 but not very reliable until 4.4.
// Works around "sorry, unimplemented: inlining failed" build errors with
// older compilers.
# define V8_HAS_ATTRIBUTE_ALWAYS_INLINE 1
# define V8_HAS_ATTRIBUTE_NOINLINE 1
# define V8_HAS_ATTRIBUTE_UNUSED 1
# define V8_HAS_ATTRIBUTE_VISIBILITY 1
# define V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT (!V8_CC_INTEL)
# define V8_HAS_BUILTIN_ASSUME_ALIGNED 1
# define V8_HAS_BUILTIN_CLZ 1
# define V8_HAS_BUILTIN_CTZ 1
# define V8_HAS_BUILTIN_EXPECT 1
# define V8_HAS_BUILTIN_FRAME_ADDRESS 1
# define V8_HAS_BUILTIN_POPCOUNT 1
// GCC doc: https://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html
#define V8_HAS_COMPUTED_GOTO 1
// Whether constexpr has full C++14 semantics, in particular that non-constexpr
// code is allowed as long as it's not executed for any constexpr instantiation.
// GCC only supports this since version 6.
# define V8_HAS_CXX14_CONSTEXPR (V8_GNUC_PREREQ(6, 0, 0))
#endif
#if defined(_MSC_VER)
# define V8_CC_MSVC 1
# define V8_HAS_DECLSPEC_NOINLINE 1
# define V8_HAS_DECLSPEC_SELECTANY 1
# define V8_HAS___FORCEINLINE 1
#endif
// -----------------------------------------------------------------------------
// Helper macros
// A macro used to make better inlining. Don't bother for debug builds.
// Use like:
// V8_INLINE int GetZero() { return 0; }
#if !defined(DEBUG) && V8_HAS_ATTRIBUTE_ALWAYS_INLINE
# define V8_INLINE inline __attribute__((always_inline))
#elif !defined(DEBUG) && V8_HAS___FORCEINLINE
# define V8_INLINE __forceinline
#else
# define V8_INLINE inline
#endif
#if V8_HAS_BUILTIN_ASSUME_ALIGNED
# define V8_ASSUME_ALIGNED(ptr, alignment) \
__builtin_assume_aligned((ptr), (alignment))
#else
# define V8_ASSUME_ALIGNED(ptr, alignment) (ptr)
#endif
// A macro to mark specific arguments as non-null.
// Use like:
// int add(int* x, int y, int* z) V8_NONNULL(1, 3) { return *x + y + *z; }
#if V8_HAS_ATTRIBUTE_NONNULL
# define V8_NONNULL(...) __attribute__((nonnull(__VA_ARGS__)))
#else
# define V8_NONNULL(...) /* NOT SUPPORTED */
#endif
// A macro used to tell the compiler to never inline a particular function.
// Use like:
// V8_NOINLINE int GetMinusOne() { return -1; }
#if V8_HAS_ATTRIBUTE_NOINLINE
# define V8_NOINLINE __attribute__((noinline))
#elif V8_HAS_DECLSPEC_NOINLINE
# define V8_NOINLINE __declspec(noinline)
#else
# define V8_NOINLINE /* NOT SUPPORTED */
#endif
// A macro (V8_DEPRECATED) to mark classes or functions as deprecated.
#if defined(V8_DEPRECATION_WARNINGS)
# define V8_DEPRECATED(message) [[deprecated(message)]]
#else
# define V8_DEPRECATED(message)
#endif
// A macro (V8_DEPRECATE_SOON) to make it easier to see what will be deprecated.
#if defined(V8_IMMINENT_DEPRECATION_WARNINGS)
# define V8_DEPRECATE_SOON(message) [[deprecated(message)]]
#else
# define V8_DEPRECATE_SOON(message)
#endif
#if defined(__GNUC__) && !defined(__clang__) && (__GNUC__ < 6)
# define V8_ENUM_DEPRECATED(message)
# define V8_ENUM_DEPRECATE_SOON(message)
#else
# define V8_ENUM_DEPRECATED(message) V8_DEPRECATED(message)
# define V8_ENUM_DEPRECATE_SOON(message) V8_DEPRECATE_SOON(message)
#endif
// A macro to provide the compiler with branch prediction information.
#if V8_HAS_BUILTIN_EXPECT
# define V8_UNLIKELY(condition) (__builtin_expect(!!(condition), 0))
# define V8_LIKELY(condition) (__builtin_expect(!!(condition), 1))
#else
# define V8_UNLIKELY(condition) (condition)
# define V8_LIKELY(condition) (condition)
#endif
// Annotate a function indicating the caller must examine the return value.
// Use like:
// int foo() V8_WARN_UNUSED_RESULT;
#if V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT
#define V8_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
#else
#define V8_WARN_UNUSED_RESULT /* NOT SUPPORTED */
#endif
#if defined(BUILDING_V8_SHARED) && defined(USING_V8_SHARED)
#error Inconsistent build configuration: To build the V8 shared library \
set BUILDING_V8_SHARED, to include its headers for linking against the \
V8 shared library set USING_V8_SHARED.
#endif
#ifdef V8_OS_WIN
// Setup for Windows DLL export/import. When building the V8 DLL the
// BUILDING_V8_SHARED needs to be defined. When building a program which uses
// the V8 DLL USING_V8_SHARED needs to be defined. When either building the V8
// static library or building a program which uses the V8 static library neither
// BUILDING_V8_SHARED nor USING_V8_SHARED should be defined.
#ifdef BUILDING_V8_SHARED
# define V8_EXPORT __declspec(dllexport)
#elif USING_V8_SHARED
# define V8_EXPORT __declspec(dllimport)
#else
# define V8_EXPORT
#endif // BUILDING_V8_SHARED
#else // V8_OS_WIN
// Setup for Linux shared library export.
#if V8_HAS_ATTRIBUTE_VISIBILITY
# ifdef BUILDING_V8_SHARED
# define V8_EXPORT __attribute__ ((visibility("default")))
# else
# define V8_EXPORT
# endif
#else
# define V8_EXPORT
#endif
#endif // V8_OS_WIN
// clang-format on
#endif // V8CONFIG_H_
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