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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_
 
 // gcc 10 defines __cplusplus to "an unspecified value strictly larger than
 // 201703L" for its experimental -std=gnu++2a config.
 // TODO(leszeks): Change to `__cplusplus <= 202002L` once we only support
 // compilers with full C++20 support.
 #if __cplusplus <= 201703L
 #error "C++20 or later required."
 #endif
 
 #ifdef V8_GN_HEADER
 #if !__has_include("v8-gn.h")
 #error Missing v8-gn.h. The configuration for v8 is missing from the include \
 path. Add it with -I<path> to the command line
 #endif
 #include "v8-gn.h"  // NOLINT(build/include_directory)
 #endif
 
 #include <memory>
 // 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>
 #elif defined(__MVS__)
 # include "zos-base.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 (macOS, Net/Free/Open/DragonFlyBSD)
 //  V8_OS_CYGWIN        - Cygwin
 //  V8_OS_DRAGONFLYBSD  - DragonFlyBSD
 //  V8_OS_FREEBSD       - FreeBSD
 //  V8_OS_FUCHSIA       - Fuchsia
 //  V8_OS_LINUX         - Linux (Android, ChromeOS, Linux, ...)
 //  V8_OS_DARWIN        - Darwin (macOS, iOS)
 //  V8_OS_MACOS         - macOS
 //  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_STARBOARD     - Starboard (platform abstraction for Cobalt)
 //  V8_OS_AIX           - AIX
 //  V8_OS_WIN           - Microsoft Windows
 //  V8_OS_ZOS           - z/OS
 
 #if defined(__ANDROID__)
 # define V8_OS_ANDROID 1
 # define V8_OS_LINUX 1
 # define V8_OS_POSIX 1
 # define V8_OS_STRING "android"
 
 #elif defined(__APPLE__)
 # define V8_OS_POSIX 1
 # define V8_OS_BSD 1
 # define V8_OS_DARWIN 1
 # if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
 #  define V8_OS_IOS 1
 #  define V8_OS_STRING "ios"
 # else
 #  define V8_OS_MACOS 1
 #  define V8_OS_STRING "macos"
 # endif  // defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
 
 #elif defined(__CYGWIN__)
 # define V8_OS_CYGWIN 1
 # define V8_OS_POSIX 1
 # define V8_OS_STRING "cygwin"
 
 #elif defined(__linux__)
 # define V8_OS_LINUX 1
 # define V8_OS_POSIX 1
 # define V8_OS_STRING "linux"
 
 #elif defined(__sun)
 # define V8_OS_POSIX 1
 # define V8_OS_SOLARIS 1
 # define V8_OS_STRING "sun"
 
 #elif defined(STARBOARD)
 # define V8_OS_STARBOARD 1
 # define V8_OS_STRING "starboard"
 
 #elif defined(_AIX)
 # define V8_OS_POSIX 1
 # define V8_OS_AIX 1
 # define V8_OS_STRING "aix"
 
 #elif defined(__FreeBSD__)
 # define V8_OS_BSD 1
 # define V8_OS_FREEBSD 1
 # define V8_OS_POSIX 1
 # define V8_OS_STRING "freebsd"
 
 #elif defined(__Fuchsia__)
 # define V8_OS_FUCHSIA 1
 # define V8_OS_POSIX 1
 # define V8_OS_STRING "fuchsia"
 
 #elif defined(__DragonFly__)
 # define V8_OS_BSD 1
 # define V8_OS_DRAGONFLYBSD 1
 # define V8_OS_POSIX 1
 # define V8_OS_STRING "dragonflybsd"
 
 #elif defined(__NetBSD__)
 # define V8_OS_BSD 1
 # define V8_OS_NETBSD 1
 # define V8_OS_POSIX 1
 # define V8_OS_STRING "netbsd"
 
 #elif defined(__OpenBSD__)
 # define V8_OS_BSD 1
 # define V8_OS_OPENBSD 1
 # define V8_OS_POSIX 1
 # define V8_OS_STRING "openbsd"
 
 #elif defined(__QNXNTO__)
 # define V8_OS_POSIX 1
 # define V8_OS_QNX 1
 # define V8_OS_STRING "qnx"
 
 #elif defined(_WIN32)
 # define V8_OS_WIN 1
 # define V8_OS_STRING "windows"
 
 #elif defined(__MVS__)
 # define V8_OS_POSIX 1
 # define V8_OS_ZOS 1
 # define V8_OS_STRING "zos"
 #endif
 
 // -----------------------------------------------------------------------------
 // Operating system detection (target)
 //
 //  V8_TARGET_OS_ANDROID
 //  V8_TARGET_OS_FUCHSIA
 //  V8_TARGET_OS_IOS
 //  V8_TARGET_OS_LINUX
 //  V8_TARGET_OS_MACOS
 //  V8_TARGET_OS_WIN
 //  V8_TARGET_OS_CHROMEOS
 //
 // 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_MACOS) \
   && !defined(V8_TARGET_OS_WIN) \
   && !defined(V8_TARGET_OS_CHROMEOS)
 #  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_MACOS) \
   || defined(V8_TARGET_OS_WIN) \
   || defined(V8_TARGET_OS_CHROMEOS)
 #  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_MACOS
 # define V8_TARGET_OS_MACOS
 #endif
 
 #ifdef V8_OS_WIN
 # define V8_TARGET_OS_WIN
 #endif
 
 #endif  // V8_HAVE_TARGET_OS
 
 #if defined(V8_TARGET_OS_ANDROID)
 # define V8_TARGET_OS_STRING "android"
 #elif defined(V8_TARGET_OS_FUCHSIA)
 # define V8_TARGET_OS_STRING "fuchsia"
 #elif defined(V8_TARGET_OS_IOS)
 # define V8_TARGET_OS_STRING "ios"
 #elif defined(V8_TARGET_OS_LINUX)
 # define V8_TARGET_OS_STRING "linux"
 #elif defined(V8_TARGET_OS_MACOS)
 # define V8_TARGET_OS_STRING "macos"
 #elif defined(V8_TARGET_OS_WINDOWS)
 # define V8_TARGET_OS_STRING "windows"
 #else
 # define V8_TARGET_OS_STRING "unknown"
 #endif
 
 // -----------------------------------------------------------------------------
 // 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_CONSTINIT          - __attribute__((require_constant_
 //                                                       initialization))
 //                                        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_USED               - __attribute__((used)) supported
 //  V8_HAS_ATTRIBUTE_RETAIN             - __attribute__((retain)) supported
 //  V8_HAS_ATTRIBUTE_VISIBILITY         - __attribute__((visibility)) supported
 //  V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT - __attribute__((warn_unused_result))
 //                                        supported
 //  V8_HAS_CPP_ATTRIBUTE_NODISCARD      - [[nodiscard]] supported
 //  V8_HAS_CPP_ATTRIBUTE_NO_UNIQUE_ADDRESS
 //                                      - [[no_unique_address]] supported
 //  V8_HAS_BUILTIN_ADD_OVERFLOW         - __builtin_add_overflow() supported
 //  V8_HAS_BUILTIN_BIT_CAST             - __builtin_bit_cast() 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_MUL_OVERFLOW         - __builtin_mul_overflow() supported
 //  V8_HAS_BUILTIN_POPCOUNT             - __builtin_popcount() supported
 //  V8_HAS_BUILTIN_SADD_OVERFLOW        - __builtin_sadd_overflow() supported
 //  V8_HAS_BUILTIN_SMUL_OVERFLOW        - __builtin_smul_overflow() supported
 //  V8_HAS_BUILTIN_SSUB_OVERFLOW        - __builtin_ssub_overflow() supported
 //  V8_HAS_BUILTIN_SUB_OVERFLOW         - __builtin_sub_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(__has_cpp_attribute)
 #define V8_HAS_CPP_ATTRIBUTE(FEATURE) __has_cpp_attribute(FEATURE)
 #else
 #define V8_HAS_CPP_ATTRIBUTE(FEATURE) 0
 #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_CONSTINIT \
     (__has_attribute(require_constant_initialization))
 # define V8_HAS_ATTRIBUTE_CONST (__has_attribute(const))
 # 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_USED (__has_attribute(used))
 # define V8_HAS_ATTRIBUTE_RETAIN (__has_attribute(retain))
 # define V8_HAS_ATTRIBUTE_OPTNONE (__has_attribute(optnone))
 // Support for the "preserve_most" attribute is limited:
 // - 32-bit platforms do not implement it,
 // - component builds fail because _dl_runtime_resolve clobbers registers,
 // - we see crashes on arm64 on Windows (https://crbug.com/1409934), which can
 //   hopefully be fixed in the future.
 // Additionally, the initial implementation in clang <= 16 overwrote the return
 // register(s) in the epilogue of a preserve_most function, so we only use
 // preserve_most in clang >= 17 (see https://reviews.llvm.org/D143425).
 #if (defined(_M_X64) || defined(__x86_64__)            /* x64 (everywhere) */  \
      || ((defined(__AARCH64EL__) || defined(_M_ARM64)) /* arm64, but ... */    \
          && !defined(_WIN32)))                         /* not on windows */    \
      && !defined(COMPONENT_BUILD)                      /* no component build */\
      && __clang_major__ >= 17                          /* clang >= 17 */
 # define V8_HAS_ATTRIBUTE_PRESERVE_MOST (__has_attribute(preserve_most))
 #endif
 # define V8_HAS_ATTRIBUTE_VISIBILITY (__has_attribute(visibility))
 # define V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT \
     (__has_attribute(warn_unused_result))
 # define V8_HAS_ATTRIBUTE_WEAK (__has_attribute(weak))
 
 # define V8_HAS_CPP_ATTRIBUTE_NODISCARD (V8_HAS_CPP_ATTRIBUTE(nodiscard))
 #if defined(V8_CC_MSVC)
 # define V8_HAS_CPP_ATTRIBUTE_NO_UNIQUE_ADDRESS       \
     (V8_HAS_CPP_ATTRIBUTE(msvc::no_unique_address) || \
      V8_HAS_CPP_ATTRIBUTE(no_unique_address))
 #else
 # define V8_HAS_CPP_ATTRIBUTE_NO_UNIQUE_ADDRESS \
     (V8_HAS_CPP_ATTRIBUTE(no_unique_address))
 #endif
 
 # define V8_HAS_BUILTIN_ADD_OVERFLOW (__has_builtin(__builtin_add_overflow))
 # define V8_HAS_BUILTIN_ASSUME (__has_builtin(__builtin_assume))
 # define V8_HAS_BUILTIN_ASSUME_ALIGNED (__has_builtin(__builtin_assume_aligned))
 # define V8_HAS_BUILTIN_BIT_CAST (__has_builtin(__builtin_bit_cast))
 # 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_MUL_OVERFLOW (__has_builtin(__builtin_mul_overflow))
 # define V8_HAS_BUILTIN_POPCOUNT (__has_builtin(__builtin_popcount))
 # define V8_HAS_BUILTIN_SADD_OVERFLOW (__has_builtin(__builtin_sadd_overflow))
 # define V8_HAS_BUILTIN_SMUL_OVERFLOW (__has_builtin(__builtin_smul_overflow))
 # define V8_HAS_BUILTIN_SSUB_OVERFLOW (__has_builtin(__builtin_ssub_overflow))
 # define V8_HAS_BUILTIN_SUB_OVERFLOW (__has_builtin(__builtin_sub_overflow))
 # define V8_HAS_BUILTIN_UADD_OVERFLOW (__has_builtin(__builtin_uadd_overflow))
 # define V8_HAS_BUILTIN_UNREACHABLE (__has_builtin(__builtin_unreachable))
 
 // 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
 
 #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)
 
 // FYI: __has_builtin is only available with GCC 10 and later, so explicitly
 // check GCC version numbers to enable features. TODO(leszeks): Merge feature
 // enabling for GCC 10 and later into the Clang section above, and leave this
 // section for GCC 9 and earlier.
 
 // 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_ATTRIBUTE_WEAK 1
 
 // [[nodiscard]] does not work together with with
 // __attribute__((visibility(""))) on GCC 7.4 which is why there is no define
 // for V8_HAS_CPP_ATTRIBUTE_NODISCARD. See https://crbug.com/v8/11707.
 
 # define V8_HAS_BUILTIN_ASSUME_ALIGNED 1
 # if __GNUC__ >= 11
 #  define V8_HAS_BUILTIN_BIT_CAST 1
 # endif
 # 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
 # define V8_HAS_BUILTIN_UNREACHABLE 1
 
 // GCC doc: https://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html
 #define V8_HAS_COMPUTED_GOTO 1
 
 #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
 
 // A macro to force better inlining of calls in a statement. Don't bother for
 // debug builds.
 // Use like:
 //   V8_INLINE_STATEMENT foo = bar(); // Will force inlining the bar() call.
 #if !defined(DEBUG) && defined(__clang__) && V8_HAS_ATTRIBUTE_ALWAYS_INLINE
 # define V8_INLINE_STATEMENT [[clang::always_inline]]
 #else
 # define V8_INLINE_STATEMENT
 #endif
 
 #if V8_HAS_BUILTIN_ASSUME
 #ifdef DEBUG
 // In debug mode, check assumptions in addition to adding annotations.
 // This helps GCC (and maybe other compilers) figure out that certain
 // situations are unreachable.
 # define V8_ASSUME(condition)    \
   do {                           \
     DCHECK(condition);           \
     __builtin_assume(condition); \
   } while (false)
 #else  // DEBUG
 # define V8_ASSUME __builtin_assume
 #endif  // DEBUG
 #elif V8_HAS_BUILTIN_UNREACHABLE
 # define V8_ASSUME(condition)                  \
   do {                                         \
     DCHECK(condition);                         \
     if (!(condition)) __builtin_unreachable(); \
   } while (false)
 #else
 # define V8_ASSUME USE
 #endif
 
 // Prefer c++20 std::assume_aligned. Don't use it on MSVC though, because it's
 // not happy with our large 4GB alignment values.
 #if __cplusplus >= 202002L && defined(__cpp_lib_assume_aligned) && !V8_CC_MSVC
 # define V8_ASSUME_ALIGNED(ptr, alignment) \
   std::assume_aligned<(alignment)>(ptr)
 #elif 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 functions whose values don't change (e.g. across calls)
 // and thereby compiler is free to hoist and fold multiple calls together.
 // Use like:
 //   V8_CONST int foo() { ... }
 #if V8_HAS_ATTRIBUTE_CONST
 # define V8_CONST __attribute__((const))
 #else
 # define V8_CONST
 #endif
 
 // A macro to mark a declaration as requiring constant initialization.
 // Use like:
 //   int* foo V8_CONSTINIT;
 #if V8_HAS_ATTRIBUTE_CONSTINIT
 # define V8_CONSTINIT __attribute__((require_constant_initialization))
 #else
 # define V8_CONSTINIT
 #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 used to change the calling conventions to preserve all registers (no
 // caller-saved registers). Use this for cold functions called from hot
 // functions.
 // Use like:
 //   V8_NOINLINE V8_PRESERVE_MOST void UnlikelyMethod();
 #if V8_OS_WIN
 # define V8_PRESERVE_MOST
 #else
 #if V8_HAS_ATTRIBUTE_PRESERVE_MOST
 # define V8_PRESERVE_MOST __attribute__((preserve_most))
 #else
 # define V8_PRESERVE_MOST /* NOT SUPPORTED */
 #endif
 #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(V8_IMMINENT_DEPRECATION_WARNINGS) || \
     defined(V8_DEPRECATION_WARNINGS)
 #if defined(V8_CC_MSVC)
 # define START_ALLOW_USE_DEPRECATED() \
     __pragma(warning(push))           \
     __pragma(warning(disable : 4996))
 # define END_ALLOW_USE_DEPRECATED() __pragma(warning(pop))
 #else  // !defined(V8_CC_MSVC)
 # define START_ALLOW_USE_DEPRECATED()                               \
     _Pragma("GCC diagnostic push")                                  \
     _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
 #define END_ALLOW_USE_DEPRECATED() _Pragma("GCC diagnostic pop")
 #endif  // !defined(V8_CC_MSVC)
 #else  // !(defined(V8_IMMINENT_DEPRECATION_WARNINGS) ||
        // defined(V8_DEPRECATION_WARNINGS))
 #define START_ALLOW_USE_DEPRECATED()
 #define END_ALLOW_USE_DEPRECATED()
 #endif  // !(defined(V8_IMMINENT_DEPRECATION_WARNINGS) ||
         // defined(V8_DEPRECATION_WARNINGS))
 #define ALLOW_COPY_AND_MOVE_WITH_DEPRECATED_FIELDS(ClassName) \
   START_ALLOW_USE_DEPRECATED()                                \
   ClassName(const ClassName&) = default;                      \
   ClassName(ClassName&&) = default;                           \
   ClassName& operator=(const ClassName&) = default;           \
   ClassName& operator=(ClassName&&) = default;                \
   END_ALLOW_USE_DEPRECATED()
 
 
 #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 functions/variables as weak to allow overriding the symbol.
 #if V8_HAS_ATTRIBUTE_WEAK
 #define V8_WEAK __attribute__((weak))
 #else
 #define V8_WEAK /* 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
 
 // The no_unique_address attribute allows tail padding in a non-static data
 // member to overlap other members of the enclosing class (and in the special
 // case when the type is empty, permits it to fully overlap other members). The
 // field is laid out as if a base class were encountered at the corresponding
 // point within the class (except that it does not share a vptr with the
 // enclosing object).
 //
 // Apply to a data member like:
 //
 //   class Foo {
 //    V8_NO_UNIQUE_ADDRESS Bar bar_;
 //   };
 //
 // [[no_unique_address]] comes in C++20 but supported in clang with
 // -std >= c++11.
 #if V8_HAS_CPP_ATTRIBUTE_NO_UNIQUE_ADDRESS
 #if defined(V8_CC_MSVC) && V8_HAS_CPP_ATTRIBUTE(msvc::no_unique_address)
 // Unfortunately MSVC ignores [[no_unique_address]] (see
 // https://devblogs.microsoft.com/cppblog/msvc-cpp20-and-the-std-cpp20-switch/#msvc-extensions-and-abi),
 // and clang-cl matches it for ABI compatibility reasons. We need to prefer
 // [[msvc::no_unique_address]] when available if we actually want any effect.
 #define V8_NO_UNIQUE_ADDRESS [[msvc::no_unique_address]]
 #else
 #define V8_NO_UNIQUE_ADDRESS [[no_unique_address]]
 #endif
 #else
 #define V8_NO_UNIQUE_ADDRESS /* NOT SUPPORTED */
 #endif
 
 // Marks a type as being eligible for the "trivial" ABI despite having a
 // non-trivial destructor or copy/move constructor. Such types can be relocated
 // after construction by simply copying their memory, which makes them eligible
 // to be passed in registers. The canonical example is std::unique_ptr.
 //
 // Use with caution; this has some subtle effects on constructor/destructor
 // ordering and will be very incorrect if the type relies on its address
 // remaining constant. When used as a function argument (by value), the value
 // may be constructed in the caller's stack frame, passed in a register, and
 // then used and destructed in the callee's stack frame. A similar thing can
 // occur when values are returned.
 //
 // TRIVIAL_ABI is not needed for types which have a trivial destructor and
 // copy/move constructors, since those are automatically trivial by the ABI
 // spec.
 //
 // It is also not likely to be effective on types too large to be passed in one
 // or two registers on typical target ABIs.
 //
 // See also:
 //   https://clang.llvm.org/docs/AttributeReference.html#trivial-abi
 //   https://libcxx.llvm.org/docs/DesignDocs/UniquePtrTrivialAbi.html
 #if defined(__clang__) && defined(__has_attribute)
 #if __has_attribute(trivial_abi)
 #define V8_TRIVIAL_ABI [[clang::trivial_abi]]
 #define V8_HAS_ATTRIBUTE_TRIVIAL_ABI 1
 #endif // __has_attribute(trivial_abi)
 #endif // defined(__clang__) && defined(__has_attribute)
 #if !defined(V8_TRIVIAL_ABI)
 #define V8_TRIVIAL_ABI
 #define V8_HAS_ATTRIBUTE_TRIVIAL_ABI 0
 #endif //!defined(V8_TRIVIAL_ABI)
 
 // 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
 
 // Exposing private symbols requires exposing public symbols too.
 #ifdef BUILDING_V8_SHARED_PRIVATE
 #define BUILDING_V8_SHARED
 #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 && (defined(BUILDING_V8_SHARED) || USING_V8_SHARED)
 # define V8_EXPORT __attribute__((visibility("default")))
 #else
 # define V8_EXPORT
 # endif  // V8_HAS_ATTRIBUTE_VISIBILITY && ...
 
 #endif  // V8_OS_WIN
 
 // clang-format on
 
 // Processor architecture detection.  For more info on what's defined, see:
 //   http://msdn.microsoft.com/en-us/library/b0084kay.aspx
 //   http://www.agner.org/optimize/calling_conventions.pdf
 //   or with gcc, run: "echo | gcc -E -dM -"
 // The V8_HOST_ARCH_* macros correspond to the architecture on which V8, as a
 // virtual machine and compiler, runs. Don't confuse this with the architecture
 // on which V8 is built.
 #if defined(_M_X64) || defined(__x86_64__)
 #define V8_HOST_ARCH_X64 1
 #if defined(__x86_64__) && __SIZEOF_POINTER__ == 4  // Check for x32.
 #define V8_HOST_ARCH_32_BIT 1
 #else
 #define V8_HOST_ARCH_64_BIT 1
 #endif
 #elif defined(_M_IX86) || defined(__i386__)
 #define V8_HOST_ARCH_IA32 1
 #define V8_HOST_ARCH_32_BIT 1
 #elif defined(__AARCH64EL__) || defined(_M_ARM64)
 #define V8_HOST_ARCH_ARM64 1
 #define V8_HOST_ARCH_64_BIT 1
 #elif defined(__ARMEL__)
 #define V8_HOST_ARCH_ARM 1
 #define V8_HOST_ARCH_32_BIT 1
 #elif defined(__mips64)
 #define V8_HOST_ARCH_MIPS64 1
 #define V8_HOST_ARCH_64_BIT 1
 #elif defined(__loongarch_lp64)
 #define V8_HOST_ARCH_LOONG64 1
 #define V8_HOST_ARCH_64_BIT 1
 #elif defined(__PPC64__) || defined(_ARCH_PPC64)
 #define V8_HOST_ARCH_PPC64 1
 #define V8_HOST_ARCH_64_BIT 1
 #elif defined(__s390x__)
 #define V8_HOST_ARCH_S390X 1
 #define V8_HOST_ARCH_64_BIT 1
 #elif defined(__riscv) || defined(__riscv__)
 #if __riscv_xlen == 64
 #define V8_HOST_ARCH_RISCV64 1
 #define V8_HOST_ARCH_64_BIT 1
 #elif __riscv_xlen == 32
 #define V8_HOST_ARCH_RISCV32 1
 #define V8_HOST_ARCH_32_BIT 1
 #else
 #error "Cannot detect Riscv's bitwidth"
 #endif
 #else
 #error "Host architecture was not detected as supported by v8"
 #endif
 
 // Target architecture detection. This corresponds to the architecture for which
 // V8's JIT will generate code (the last stage of the canadian cross-compiler).
 // The macros may be set externally. If not, detect in the same way as the host
 // architecture, that is, target the native environment as presented by the
 // compiler.
 #if !V8_TARGET_ARCH_X64 && !V8_TARGET_ARCH_IA32 && !V8_TARGET_ARCH_ARM && \
     !V8_TARGET_ARCH_ARM64 && !V8_TARGET_ARCH_MIPS64 &&                    \
     !V8_TARGET_ARCH_PPC64 && !V8_TARGET_ARCH_S390X &&                     \
     !V8_TARGET_ARCH_RISCV64 && !V8_TARGET_ARCH_LOONG64 &&                 \
     !V8_TARGET_ARCH_RISCV32
 #if defined(_M_X64) || defined(__x86_64__)
 #define V8_TARGET_ARCH_X64 1
 #elif defined(_M_IX86) || defined(__i386__)
 #define V8_TARGET_ARCH_IA32 1
 #elif defined(__AARCH64EL__) || defined(_M_ARM64)
 #define V8_TARGET_ARCH_ARM64 1
 #elif defined(__ARMEL__)
 #define V8_TARGET_ARCH_ARM 1
 #elif defined(__mips64)
 #define V8_TARGET_ARCH_MIPS64 1
 #elif defined(__loongarch_lp64)
 #define V8_TARGET_ARCH_LOONG64 1
 #elif defined(_ARCH_PPC64)
 #define V8_TARGET_ARCH_PPC64 1
 #elif defined(__s390x__)
 #define V8_TARGET_ARCH_S390X 1
 #elif defined(__riscv) || defined(__riscv__)
 #if __riscv_xlen == 64
 #define V8_TARGET_ARCH_RISCV64 1
 #elif __riscv_xlen == 32
 #define V8_TARGET_ARCH_RISCV32 1
 #endif
 #else
 #error Target architecture was not detected as supported by v8
 #endif
 #endif
 
 // Determine architecture pointer size.
 #if V8_TARGET_ARCH_IA32
 #define V8_TARGET_ARCH_32_BIT 1
 #elif V8_TARGET_ARCH_X64
 #if !V8_TARGET_ARCH_32_BIT && !V8_TARGET_ARCH_64_BIT
 #if defined(__x86_64__) && __SIZEOF_POINTER__ == 4  // Check for x32.
 #define V8_TARGET_ARCH_32_BIT 1
 #else
 #define V8_TARGET_ARCH_64_BIT 1
 #endif
 #endif
 #elif V8_TARGET_ARCH_ARM
 #define V8_TARGET_ARCH_32_BIT 1
 #elif V8_TARGET_ARCH_ARM64
 #define V8_TARGET_ARCH_64_BIT 1
 #elif V8_TARGET_ARCH_MIPS
 #define V8_TARGET_ARCH_32_BIT 1
 #elif V8_TARGET_ARCH_MIPS64
 #define V8_TARGET_ARCH_64_BIT 1
 #elif V8_TARGET_ARCH_LOONG64
 #define V8_TARGET_ARCH_64_BIT 1
 #elif V8_TARGET_ARCH_PPC64
 #define V8_TARGET_ARCH_64_BIT 1
 #elif V8_TARGET_ARCH_S390X
 #define V8_TARGET_ARCH_64_BIT 1
 #elif V8_TARGET_ARCH_RISCV64
 #define V8_TARGET_ARCH_64_BIT 1
 #elif V8_TARGET_ARCH_RISCV32
 #define V8_TARGET_ARCH_32_BIT 1
 #else
 #error Unknown target architecture pointer size
 #endif
 
 // Check for supported combinations of host and target architectures.
 #if V8_TARGET_ARCH_IA32 && !V8_HOST_ARCH_IA32
 #error Target architecture ia32 is only supported on ia32 host
 #endif
 #if (V8_TARGET_ARCH_X64 && V8_TARGET_ARCH_64_BIT && \
      !((V8_HOST_ARCH_X64 || V8_HOST_ARCH_ARM64) && V8_HOST_ARCH_64_BIT))
 #error Target architecture x64 is only supported on x64 and arm64 host
 #endif
 #if (V8_TARGET_ARCH_X64 && V8_TARGET_ARCH_32_BIT && \
      !(V8_HOST_ARCH_X64 && V8_HOST_ARCH_32_BIT))
 #error Target architecture x32 is only supported on x64 host with x32 support
 #endif
 #if (V8_TARGET_ARCH_ARM && !(V8_HOST_ARCH_IA32 || V8_HOST_ARCH_ARM))
 #error Target architecture arm is only supported on arm and ia32 host
 #endif
 #if (V8_TARGET_ARCH_ARM64 && !(V8_HOST_ARCH_X64 || V8_HOST_ARCH_ARM64))
 #error Target architecture arm64 is only supported on arm64 and x64 host
 #endif
 #if (V8_TARGET_ARCH_MIPS64 && !(V8_HOST_ARCH_X64 || V8_HOST_ARCH_MIPS64))
 #error Target architecture mips64 is only supported on mips64 and x64 host
 #endif
 #if (V8_TARGET_ARCH_RISCV64 && !(V8_HOST_ARCH_X64 || V8_HOST_ARCH_RISCV64))
 #error Target architecture riscv64 is only supported on riscv64 and x64 host
 #endif
 #if (V8_TARGET_ARCH_RISCV32 && !(V8_HOST_ARCH_IA32 || V8_HOST_ARCH_RISCV32))
 #error Target architecture riscv32 is only supported on riscv32 and ia32 host
 #endif
 #if (V8_TARGET_ARCH_LOONG64 && !(V8_HOST_ARCH_X64 || V8_HOST_ARCH_LOONG64))
 #error Target architecture loong64 is only supported on loong64 and x64 host
 #endif
 
 // Determine architecture endianness.
 #if V8_TARGET_ARCH_IA32
 #define V8_TARGET_LITTLE_ENDIAN 1
 #elif V8_TARGET_ARCH_X64
 #define V8_TARGET_LITTLE_ENDIAN 1
 #elif V8_TARGET_ARCH_ARM
 #define V8_TARGET_LITTLE_ENDIAN 1
 #elif V8_TARGET_ARCH_ARM64
 #define V8_TARGET_LITTLE_ENDIAN 1
 #elif V8_TARGET_ARCH_LOONG64
 #define V8_TARGET_LITTLE_ENDIAN 1
 #elif V8_TARGET_ARCH_MIPS64
 #if defined(__MIPSEB__) || defined(V8_TARGET_ARCH_MIPS64_BE)
 #define V8_TARGET_BIG_ENDIAN 1
 #else
 #define V8_TARGET_LITTLE_ENDIAN 1
 #endif
 #elif V8_TARGET_ARCH_PPC64
 #if V8_OS_AIX
 #define V8_TARGET_BIG_ENDIAN 1
 #else
 #define V8_TARGET_LITTLE_ENDIAN 1
 #endif
 #elif V8_TARGET_ARCH_S390X
 #if V8_TARGET_ARCH_S390X_LE_SIM
 #define V8_TARGET_LITTLE_ENDIAN 1
 #else
 #define V8_TARGET_BIG_ENDIAN 1
 #endif
 #elif V8_TARGET_ARCH_RISCV32 || V8_TARGET_ARCH_RISCV64
 #define V8_TARGET_LITTLE_ENDIAN 1
 #elif defined(__BYTE_ORDER__)
 #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
 #define V8_TARGET_BIG_ENDIAN 1
 #else
 #define V8_TARGET_LITTLE_ENDIAN 1
 #endif
 #else
 #error Unknown target architecture endianness
 #endif
 
 #undef V8_HAS_CPP_ATTRIBUTE
 
 #if !defined(V8_STATIC_ROOTS)
 #define V8_STATIC_ROOTS_BOOL false
 #else
 #define V8_STATIC_ROOTS_BOOL true
 #endif
 #ifdef V8_TARGET_BIG_ENDIAN
 #define V8_TARGET_BIG_ENDIAN_BOOL true
 #else
 #define V8_TARGET_BIG_ENDIAN_BOOL false
 #endif
 
 #endif  // V8CONFIG_H_

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