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main
deps/v8/include/v8config.h
1 077 строк
36 KB
Stefan Stojanovic
deps: define V8_PRESERVE_MOST as no-op on Windows
24 апр 2026, 19:01
Не верифицирован
24 апр 2026, 19:01
add506a
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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_TVOS - tvOS (also sets V8_OS_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" # if defined(TARGET_OS_TV) && TARGET_OS_TV # define V8_OS_TVOS 1 # endif # 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_TVOS (also sets 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_TVOS) \ && !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_TVOS) \ || 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_TVOS # define V8_TARGET_OS_TVOS #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_CPP_ATTRIBUTE_LIFETIME_BOUND - [[clang::lifetimebound]] supported // V8_HAS_BUILTIN_ADD_OVERFLOW - __builtin_add_overflow() 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_CPP_ATTRIBUTE_LIFETIME_BOUND (V8_HAS_CPP_ATTRIBUTE(clang::lifetimebound)) # 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_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 # 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. #if __cplusplus >= 202002L && defined(__cpp_lib_assume_aligned) # 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 // Annotate a function to ensure the function is retained in the compiled binary // even if it appears to be unused to the compiler. #if V8_HAS_ATTRIBUTE_USED && V8_HAS_ATTRIBUTE_VISIBILITY #define V8_SYMBOL_USED \ __attribute__((used, visibility("default"))) #else #define V8_SYMBOL_USED /* 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 // Annotates a pointer or reference parameter or return value for a member // function as having lifetime intertwined with the instance on which the // function is called. For parameters, the function is assumed to store the // value into the called-on object, so if the referred-to object is later // destroyed, the called-on object is also considered to be dangling. For return // values, the value is assumed to point into the called-on object, so if that // object is destroyed, the returned value is also considered to be dangling. // Useful to diagnose some cases of lifetime errors. // // See also: // https://clang.llvm.org/docs/AttributeReference.html#lifetimebound // // Usage: // ``` // struct S { // S(int* p V8_LIFETIME_BOUND); // int* Get() V8_LIFETIME_BOUND; // }; // S Func1() { // int i = 0; // // The following return will not compile; diagnosed as returning address // // of a stack object. // return S(&i); // } // int* Func2(int* p) { // // The following return will not compile; diagnosed as returning address // // of a local temporary. // return S(p).Get(); // } #if V8_HAS_CPP_ATTRIBUTE_LIFETIME_BOUND #define V8_LIFETIME_BOUND [[clang::lifetimebound]] #else #define V8_LIFETIME_BOUND /* 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_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_ARM64 || V8_HOST_ARCH_RISCV64)) #error Target architecture riscv64 is only supported on riscv64, x64, and \ arm64 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 // V8_USE_PERFETTO_SDK and V8_USE_PERFETTO_JSON_EXPORT must imply // V8_USE_PERFETTO. #if (defined(V8_USE_PERFETTO_SDK) || defined(V8_USE_PERFETTO_JSON_EXPORT)) && \ !defined(V8_USE_PERFETTO) #error Inconsistent build configuration: To build the V8 with Perfetto \ features, set V8_USE_PERFETTO as well. #endif #endif // V8CONFIG_H_