| // 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 |
| // |
| // V8_OS_STARBOARD - Starboard (platform abstraction layer for the Cobalt project) |
| // 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_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(STARBOARD) |
| # define V8_OS_STARBOARD 1 |
| #elif 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 |
| #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 |
| |
| |
| // ----------------------------------------------------------------------------- |
| // 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 |
| // |
| // V8_HAS_CXX11_ALIGNAS - alignas specifier supported |
| // V8_HAS_CXX11_ALIGNOF - alignof(type) operator supported |
| // |
| // Compiler-specific feature detection |
| // |
| // V8_HAS___ALIGNOF - __alignof(type) operator supported |
| // V8_HAS___ALIGNOF__ - __alignof__(type) operator supported |
| // V8_HAS_ATTRIBUTE_ALIGNED - __attribute__((aligned(n))) supported |
| // V8_HAS_ATTRIBUTE_ALWAYS_INLINE - __attribute__((always_inline)) |
| // supported |
| // V8_HAS_ATTRIBUTE_DEPRECATED - __attribute__((deprecated)) 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_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_DECLSPEC_ALIGN - __declspec(align(n)) supported |
| // V8_HAS_DECLSPEC_DEPRECATED - __declspec(deprecated) supported |
| // V8_HAS_DECLSPEC_NOINLINE - __declspec(noinline) supported |
| // V8_HAS_DECLSPEC_SELECTANY - __declspec(selectany) supported |
| // V8_HAS_DECLSPEC_NORETURN - __declspec(noreturn) 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 |
| |
| // Clang defines __alignof__ as alias for __alignof |
| # define V8_HAS___ALIGNOF 1 |
| # define V8_HAS___ALIGNOF__ V8_HAS___ALIGNOF |
| |
| # define V8_HAS_ATTRIBUTE_ALIGNED (__has_attribute(aligned)) |
| # define V8_HAS_ATTRIBUTE_ALWAYS_INLINE (__has_attribute(always_inline)) |
| # define V8_HAS_ATTRIBUTE_DEPRECATED (__has_attribute(deprecated)) |
| # 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_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)) |
| |
| # define V8_HAS_CXX11_ALIGNAS (__has_feature(cxx_alignas)) |
| |
| #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) |
| |
| # define V8_HAS___ALIGNOF__ (V8_GNUC_PREREQ(4, 3, 0)) |
| |
| # define V8_HAS_ATTRIBUTE_ALIGNED (V8_GNUC_PREREQ(2, 95, 0)) |
| // 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 (V8_GNUC_PREREQ(4, 4, 0)) |
| # define V8_HAS_ATTRIBUTE_DEPRECATED (V8_GNUC_PREREQ(3, 4, 0)) |
| # define V8_HAS_ATTRIBUTE_DEPRECATED_MESSAGE (V8_GNUC_PREREQ(4, 5, 0)) |
| # define V8_HAS_ATTRIBUTE_NOINLINE (V8_GNUC_PREREQ(3, 4, 0)) |
| # define V8_HAS_ATTRIBUTE_UNUSED (V8_GNUC_PREREQ(2, 95, 0)) |
| # define V8_HAS_ATTRIBUTE_VISIBILITY (V8_GNUC_PREREQ(4, 3, 0)) |
| # define V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT \ |
| (!V8_CC_INTEL && V8_GNUC_PREREQ(4, 1, 0)) |
| |
| # define V8_HAS_BUILTIN_CLZ (V8_GNUC_PREREQ(3, 4, 0)) |
| # define V8_HAS_BUILTIN_CTZ (V8_GNUC_PREREQ(3, 4, 0)) |
| # define V8_HAS_BUILTIN_EXPECT (V8_GNUC_PREREQ(2, 96, 0)) |
| # define V8_HAS_BUILTIN_FRAME_ADDRESS (V8_GNUC_PREREQ(2, 96, 0)) |
| # define V8_HAS_BUILTIN_POPCOUNT (V8_GNUC_PREREQ(3, 4, 0)) |
| |
| # if __cplusplus >= 201103L |
| # define V8_HAS_CXX11_ALIGNAS (V8_GNUC_PREREQ(4, 8, 0)) |
| # define V8_HAS_CXX11_ALIGNOF (V8_GNUC_PREREQ(4, 8, 0)) |
| # endif |
| #endif |
| |
| #if defined(_MSC_VER) |
| # define V8_CC_MSVC 1 |
| # define V8_HAS___ALIGNOF 1 |
| |
| # define V8_HAS_DECLSPEC_ALIGN 1 |
| # define V8_HAS_DECLSPEC_DEPRECATED 1 |
| # define V8_HAS_DECLSPEC_NOINLINE 1 |
| # define V8_HAS_DECLSPEC_SELECTANY 1 |
| # define V8_HAS_DECLSPEC_NORETURN 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 used to tell the compiler to never inline a particular function. |
| // Don't bother for debug builds. |
| // Use like: |
| // V8_NOINLINE int GetMinusOne() { return -1; } |
| #if !defined(DEBUG) && V8_HAS_ATTRIBUTE_NOINLINE |
| # define V8_NOINLINE __attribute__((noinline)) |
| #elif !defined(DEBUG) && 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) && V8_HAS_ATTRIBUTE_DEPRECATED_MESSAGE |
| #define V8_DEPRECATED(message, declarator) \ |
| declarator __attribute__((deprecated(message))) |
| #elif defined(V8_DEPRECATION_WARNINGS) && V8_HAS_ATTRIBUTE_DEPRECATED |
| #define V8_DEPRECATED(message, declarator) \ |
| declarator __attribute__((deprecated)) |
| #elif defined(V8_DEPRECATION_WARNINGS) && V8_HAS_DECLSPEC_DEPRECATED |
| #define V8_DEPRECATED(message, declarator) __declspec(deprecated) declarator |
| #else |
| #define V8_DEPRECATED(message, declarator) declarator |
| #endif |
| |
| |
| // A macro (V8_DEPRECATE_SOON) to make it easier to see what will be deprecated. |
| #if defined(V8_IMMINENT_DEPRECATION_WARNINGS) && \ |
| V8_HAS_ATTRIBUTE_DEPRECATED_MESSAGE |
| #define V8_DEPRECATE_SOON(message, declarator) \ |
| declarator __attribute__((deprecated(message))) |
| #elif defined(V8_IMMINENT_DEPRECATION_WARNINGS) && V8_HAS_ATTRIBUTE_DEPRECATED |
| #define V8_DEPRECATE_SOON(message, declarator) \ |
| declarator __attribute__((deprecated)) |
| #elif defined(V8_IMMINENT_DEPRECATION_WARNINGS) && V8_HAS_DECLSPEC_DEPRECATED |
| #define V8_DEPRECATE_SOON(message, declarator) __declspec(deprecated) declarator |
| #else |
| #define V8_DEPRECATE_SOON(message, declarator) declarator |
| #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 |
| |
| |
| // This macro allows to specify memory alignment for structs, classes, etc. |
| // Use like: |
| // class V8_ALIGNED(16) MyClass { ... }; |
| // V8_ALIGNED(32) int array[42]; |
| #if V8_HAS_CXX11_ALIGNAS |
| # define V8_ALIGNED(n) alignas(n) |
| #elif V8_HAS_ATTRIBUTE_ALIGNED |
| # define V8_ALIGNED(n) __attribute__((aligned(n))) |
| #elif V8_HAS_DECLSPEC_ALIGN |
| # define V8_ALIGNED(n) __declspec(align(n)) |
| #else |
| # define V8_ALIGNED(n) /* NOT SUPPORTED */ |
| #endif |
| |
| |
| // This macro is similar to V8_ALIGNED(), but takes a type instead of size |
| // in bytes. If the compiler does not supports using the alignment of the |
| // |type|, it will align according to the |alignment| instead. For example, |
| // Visual Studio C++ cannot combine __declspec(align) and __alignof. The |
| // |alignment| must be a literal that is used as a kind of worst-case fallback |
| // alignment. |
| // Use like: |
| // struct V8_ALIGNAS(AnotherClass, 16) NewClass { ... }; |
| // V8_ALIGNAS(double, 8) int array[100]; |
| #if V8_HAS_CXX11_ALIGNAS |
| # define V8_ALIGNAS(type, alignment) alignas(type) |
| #elif V8_HAS___ALIGNOF__ && V8_HAS_ATTRIBUTE_ALIGNED |
| # define V8_ALIGNAS(type, alignment) __attribute__((aligned(__alignof__(type)))) |
| #else |
| # define V8_ALIGNAS(type, alignment) V8_ALIGNED(alignment) |
| #endif |
| |
| |
| // This macro returns alignment in bytes (an integer power of two) required for |
| // any instance of the given type, which is either complete type, an array type, |
| // or a reference type. |
| // Use like: |
| // size_t alignment = V8_ALIGNOF(double); |
| #if V8_HAS_CXX11_ALIGNOF |
| # define V8_ALIGNOF(type) alignof(type) |
| #elif V8_HAS___ALIGNOF |
| # define V8_ALIGNOF(type) __alignof(type) |
| #elif V8_HAS___ALIGNOF__ |
| # define V8_ALIGNOF(type) __alignof__(type) |
| #else |
| // Note that alignment of a type within a struct can be less than the |
| // alignment of the type stand-alone (because of ancient ABIs), so this |
| // should only be used as a last resort. |
| namespace v8 { template <typename T> class AlignOfHelper { char c; T t; }; } |
| # define V8_ALIGNOF(type) (sizeof(::v8::AlignOfHelper<type>) - sizeof(type)) |
| #endif |
| |
| // Annotate a function indicating the caller must examine the return value. |
| // Use like: |
| // int foo() 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 |
| |
| // clang-format on |
| |
| // Prior to mid-2018, Cobalt had its own array buffers / typed array |
| // implementations, which were implemented the way other normal web IDL |
| // platform objects are implemented. When they are registered via |
| // FunctionTemplates during bindings initialization, they cause many V8 |
| // internal DCHECKs to trigger, as V8 codes around the invariant of no object |
| // properties being replaced by templates. These specific DCHECKs are |
| // temporarily disabled in order to allow all other DCHECKs to be turned on. |
| // Once DOM array buffers are replaced with script array buffers, these |
| // DCHECKs should be re-enabled (by removing this macro and all references to |
| // it). |
| // |
| // tl;dr V8 doesn't like Cobalt's array buffers, and fights back with DCHECKs. |
| #if defined(COBALT) |
| #define COBALT_ARRAY_BUFFER_COLLISION_WORKAROUND 1 |
| #endif |
| |
| #endif // V8CONFIG_H_ |
