1 | // Copyright 2013 the V8 project authors. All rights reserved. |
2 | // Use of this source code is governed by a BSD-style license that can be |
3 | // found in the LICENSE file. |
4 | |
5 | #ifndef V8CONFIG_H_ |
6 | #define V8CONFIG_H_ |
7 | |
8 | // clang-format off |
9 | |
10 | // Platform headers for feature detection below. |
11 | #if defined(__ANDROID__) |
12 | # include <sys/cdefs.h> |
13 | #elif defined(__APPLE__) |
14 | # include <TargetConditionals.h> |
15 | #elif defined(__linux__) |
16 | # include <features.h> |
17 | #endif |
18 | |
19 | |
20 | // This macro allows to test for the version of the GNU C library (or |
21 | // a compatible C library that masquerades as glibc). It evaluates to |
22 | // 0 if libc is not GNU libc or compatible. |
23 | // Use like: |
24 | // #if V8_GLIBC_PREREQ(2, 3) |
25 | // ... |
26 | // #endif |
27 | #if defined(__GLIBC__) && defined(__GLIBC_MINOR__) |
28 | # define V8_GLIBC_PREREQ(major, minor) \ |
29 | ((__GLIBC__ * 100 + __GLIBC_MINOR__) >= ((major) * 100 + (minor))) |
30 | #else |
31 | # define V8_GLIBC_PREREQ(major, minor) 0 |
32 | #endif |
33 | |
34 | |
35 | // This macro allows to test for the version of the GNU C++ compiler. |
36 | // Note that this also applies to compilers that masquerade as GCC, |
37 | // for example clang and the Intel C++ compiler for Linux. |
38 | // Use like: |
39 | // #if V8_GNUC_PREREQ(4, 3, 1) |
40 | // ... |
41 | // #endif |
42 | #if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__) |
43 | # define V8_GNUC_PREREQ(major, minor, patchlevel) \ |
44 | ((__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) >= \ |
45 | ((major) * 10000 + (minor) * 100 + (patchlevel))) |
46 | #elif defined(__GNUC__) && defined(__GNUC_MINOR__) |
47 | # define V8_GNUC_PREREQ(major, minor, patchlevel) \ |
48 | ((__GNUC__ * 10000 + __GNUC_MINOR__ * 100) >= \ |
49 | ((major) * 10000 + (minor) * 100 + (patchlevel))) |
50 | #else |
51 | # define V8_GNUC_PREREQ(major, minor, patchlevel) 0 |
52 | #endif |
53 | |
54 | |
55 | |
56 | // ----------------------------------------------------------------------------- |
57 | // Operating system detection |
58 | // |
59 | // V8_OS_ANDROID - Android |
60 | // V8_OS_BSD - BSDish (Mac OS X, Net/Free/Open/DragonFlyBSD) |
61 | // V8_OS_CYGWIN - Cygwin |
62 | // V8_OS_DRAGONFLYBSD - DragonFlyBSD |
63 | // V8_OS_FREEBSD - FreeBSD |
64 | // V8_OS_FUCHSIA - Fuchsia |
65 | // V8_OS_LINUX - Linux |
66 | // V8_OS_MACOSX - Mac OS X |
67 | // V8_OS_NETBSD - NetBSD |
68 | // V8_OS_OPENBSD - OpenBSD |
69 | // V8_OS_POSIX - POSIX compatible (mostly everything except Windows) |
70 | // V8_OS_QNX - QNX Neutrino |
71 | // V8_OS_SOLARIS - Sun Solaris and OpenSolaris |
72 | // V8_OS_AIX - AIX |
73 | // V8_OS_WIN - Microsoft Windows |
74 | |
75 | #if defined(__ANDROID__) |
76 | # define V8_OS_ANDROID 1 |
77 | # define V8_OS_LINUX 1 |
78 | # define V8_OS_POSIX 1 |
79 | #elif defined(__APPLE__) |
80 | # define V8_OS_BSD 1 |
81 | # define V8_OS_MACOSX 1 |
82 | # define V8_OS_POSIX 1 |
83 | #elif defined(__CYGWIN__) |
84 | # define V8_OS_CYGWIN 1 |
85 | # define V8_OS_POSIX 1 |
86 | #elif defined(__linux__) |
87 | # define V8_OS_LINUX 1 |
88 | # define V8_OS_POSIX 1 |
89 | #elif defined(__sun) |
90 | # define V8_OS_POSIX 1 |
91 | # define V8_OS_SOLARIS 1 |
92 | #elif defined(_AIX) |
93 | #define V8_OS_POSIX 1 |
94 | #define V8_OS_AIX 1 |
95 | #elif defined(__FreeBSD__) |
96 | # define V8_OS_BSD 1 |
97 | # define V8_OS_FREEBSD 1 |
98 | # define V8_OS_POSIX 1 |
99 | #elif defined(__Fuchsia__) |
100 | # define V8_OS_FUCHSIA 1 |
101 | # define V8_OS_POSIX 1 |
102 | #elif defined(__DragonFly__) |
103 | # define V8_OS_BSD 1 |
104 | # define V8_OS_DRAGONFLYBSD 1 |
105 | # define V8_OS_POSIX 1 |
106 | #elif defined(__NetBSD__) |
107 | # define V8_OS_BSD 1 |
108 | # define V8_OS_NETBSD 1 |
109 | # define V8_OS_POSIX 1 |
110 | #elif defined(__OpenBSD__) |
111 | # define V8_OS_BSD 1 |
112 | # define V8_OS_OPENBSD 1 |
113 | # define V8_OS_POSIX 1 |
114 | #elif defined(__QNXNTO__) |
115 | # define V8_OS_POSIX 1 |
116 | # define V8_OS_QNX 1 |
117 | #elif defined(_WIN32) |
118 | # define V8_OS_WIN 1 |
119 | #endif |
120 | |
121 | |
122 | // ----------------------------------------------------------------------------- |
123 | // C library detection |
124 | // |
125 | // V8_LIBC_MSVCRT - MSVC libc |
126 | // V8_LIBC_BIONIC - Bionic libc |
127 | // V8_LIBC_BSD - BSD libc derivate |
128 | // V8_LIBC_GLIBC - GNU C library |
129 | // V8_LIBC_UCLIBC - uClibc |
130 | // |
131 | // Note that testing for libc must be done using #if not #ifdef. For example, |
132 | // to test for the GNU C library, use: |
133 | // #if V8_LIBC_GLIBC |
134 | // ... |
135 | // #endif |
136 | |
137 | #if defined (_MSC_VER) |
138 | # define V8_LIBC_MSVCRT 1 |
139 | #elif defined(__BIONIC__) |
140 | # define V8_LIBC_BIONIC 1 |
141 | # define V8_LIBC_BSD 1 |
142 | #elif defined(__UCLIBC__) |
143 | // Must test for UCLIBC before GLIBC, as UCLIBC pretends to be GLIBC. |
144 | # define V8_LIBC_UCLIBC 1 |
145 | #elif defined(__GLIBC__) || defined(__GNU_LIBRARY__) |
146 | # define V8_LIBC_GLIBC 1 |
147 | #else |
148 | # define V8_LIBC_BSD V8_OS_BSD |
149 | #endif |
150 | |
151 | |
152 | // ----------------------------------------------------------------------------- |
153 | // Compiler detection |
154 | // |
155 | // V8_CC_GNU - GCC, or clang in gcc mode |
156 | // V8_CC_INTEL - Intel C++ |
157 | // V8_CC_MINGW - Minimalist GNU for Windows |
158 | // V8_CC_MINGW32 - Minimalist GNU for Windows (mingw32) |
159 | // V8_CC_MINGW64 - Minimalist GNU for Windows (mingw-w64) |
160 | // V8_CC_MSVC - Microsoft Visual C/C++, or clang in cl.exe mode |
161 | // |
162 | // C++11 feature detection |
163 | // |
164 | // Compiler-specific feature detection |
165 | // |
166 | // V8_HAS_ATTRIBUTE_ALWAYS_INLINE - __attribute__((always_inline)) |
167 | // supported |
168 | // V8_HAS_ATTRIBUTE_DEPRECATED - __attribute__((deprecated)) supported |
169 | // V8_HAS_ATTRIBUTE_NOINLINE - __attribute__((noinline)) supported |
170 | // V8_HAS_ATTRIBUTE_UNUSED - __attribute__((unused)) supported |
171 | // V8_HAS_ATTRIBUTE_VISIBILITY - __attribute__((visibility)) supported |
172 | // V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT - __attribute__((warn_unused_result)) |
173 | // supported |
174 | // V8_HAS_BUILTIN_BSWAP16 - __builtin_bswap16() supported |
175 | // V8_HAS_BUILTIN_BSWAP32 - __builtin_bswap32() supported |
176 | // V8_HAS_BUILTIN_BSWAP64 - __builtin_bswap64() supported |
177 | // V8_HAS_BUILTIN_CLZ - __builtin_clz() supported |
178 | // V8_HAS_BUILTIN_CTZ - __builtin_ctz() supported |
179 | // V8_HAS_BUILTIN_EXPECT - __builtin_expect() supported |
180 | // V8_HAS_BUILTIN_FRAME_ADDRESS - __builtin_frame_address() supported |
181 | // V8_HAS_BUILTIN_POPCOUNT - __builtin_popcount() supported |
182 | // V8_HAS_BUILTIN_SADD_OVERFLOW - __builtin_sadd_overflow() supported |
183 | // V8_HAS_BUILTIN_SSUB_OVERFLOW - __builtin_ssub_overflow() supported |
184 | // V8_HAS_BUILTIN_UADD_OVERFLOW - __builtin_uadd_overflow() supported |
185 | // V8_HAS_DECLSPEC_DEPRECATED - __declspec(deprecated) supported |
186 | // V8_HAS_DECLSPEC_NOINLINE - __declspec(noinline) supported |
187 | // V8_HAS_DECLSPEC_SELECTANY - __declspec(selectany) supported |
188 | // V8_HAS_DECLSPEC_NORETURN - __declspec(noreturn) supported |
189 | // V8_HAS___FORCEINLINE - __forceinline supported |
190 | // |
191 | // Note that testing for compilers and/or features must be done using #if |
192 | // not #ifdef. For example, to test for Intel C++ Compiler, use: |
193 | // #if V8_CC_INTEL |
194 | // ... |
195 | // #endif |
196 | |
197 | #if defined(__clang__) |
198 | |
199 | #if defined(__GNUC__) // Clang in gcc mode. |
200 | # define V8_CC_GNU 1 |
201 | #endif |
202 | |
203 | # define V8_HAS_ATTRIBUTE_ALWAYS_INLINE (__has_attribute(always_inline)) |
204 | # define V8_HAS_ATTRIBUTE_DEPRECATED (__has_attribute(deprecated)) |
205 | # define V8_HAS_ATTRIBUTE_DEPRECATED_MESSAGE \ |
206 | (__has_extension(attribute_deprecated_with_message)) |
207 | # define V8_HAS_ATTRIBUTE_NOINLINE (__has_attribute(noinline)) |
208 | # define V8_HAS_ATTRIBUTE_UNUSED (__has_attribute(unused)) |
209 | # define V8_HAS_ATTRIBUTE_VISIBILITY (__has_attribute(visibility)) |
210 | # define V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT \ |
211 | (__has_attribute(warn_unused_result)) |
212 | |
213 | # define V8_HAS_BUILTIN_BSWAP16 (__has_builtin(__builtin_bswap16)) |
214 | # define V8_HAS_BUILTIN_BSWAP32 (__has_builtin(__builtin_bswap32)) |
215 | # define V8_HAS_BUILTIN_BSWAP64 (__has_builtin(__builtin_bswap64)) |
216 | # define V8_HAS_BUILTIN_CLZ (__has_builtin(__builtin_clz)) |
217 | # define V8_HAS_BUILTIN_CTZ (__has_builtin(__builtin_ctz)) |
218 | # define V8_HAS_BUILTIN_EXPECT (__has_builtin(__builtin_expect)) |
219 | # define V8_HAS_BUILTIN_FRAME_ADDRESS (__has_builtin(__builtin_frame_address)) |
220 | # define V8_HAS_BUILTIN_POPCOUNT (__has_builtin(__builtin_popcount)) |
221 | # define V8_HAS_BUILTIN_SADD_OVERFLOW (__has_builtin(__builtin_sadd_overflow)) |
222 | # define V8_HAS_BUILTIN_SSUB_OVERFLOW (__has_builtin(__builtin_ssub_overflow)) |
223 | # define V8_HAS_BUILTIN_UADD_OVERFLOW (__has_builtin(__builtin_uadd_overflow)) |
224 | |
225 | # if __cplusplus >= 201402L |
226 | # define V8_CAN_HAVE_DCHECK_IN_CONSTEXPR 1 |
227 | # endif |
228 | |
229 | #elif defined(__GNUC__) |
230 | |
231 | # define V8_CC_GNU 1 |
232 | # if defined(__INTEL_COMPILER) // Intel C++ also masquerades as GCC 3.2.0 |
233 | # define V8_CC_INTEL 1 |
234 | # endif |
235 | # if defined(__MINGW32__) |
236 | # define V8_CC_MINGW32 1 |
237 | # endif |
238 | # if defined(__MINGW64__) |
239 | # define V8_CC_MINGW64 1 |
240 | # endif |
241 | # define V8_CC_MINGW (V8_CC_MINGW32 || V8_CC_MINGW64) |
242 | |
243 | // always_inline is available in gcc 4.0 but not very reliable until 4.4. |
244 | // Works around "sorry, unimplemented: inlining failed" build errors with |
245 | // older compilers. |
246 | # define V8_HAS_ATTRIBUTE_ALWAYS_INLINE (V8_GNUC_PREREQ(4, 4, 0)) |
247 | # define V8_HAS_ATTRIBUTE_DEPRECATED (V8_GNUC_PREREQ(3, 4, 0)) |
248 | # define V8_HAS_ATTRIBUTE_DEPRECATED_MESSAGE (V8_GNUC_PREREQ(4, 5, 0)) |
249 | # define V8_HAS_ATTRIBUTE_NOINLINE (V8_GNUC_PREREQ(3, 4, 0)) |
250 | # define V8_HAS_ATTRIBUTE_UNUSED (V8_GNUC_PREREQ(2, 95, 0)) |
251 | # define V8_HAS_ATTRIBUTE_VISIBILITY (V8_GNUC_PREREQ(4, 3, 0)) |
252 | # define V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT \ |
253 | (!V8_CC_INTEL && V8_GNUC_PREREQ(4, 1, 0)) |
254 | |
255 | # define V8_HAS_BUILTIN_CLZ (V8_GNUC_PREREQ(3, 4, 0)) |
256 | # define V8_HAS_BUILTIN_CTZ (V8_GNUC_PREREQ(3, 4, 0)) |
257 | # define V8_HAS_BUILTIN_EXPECT (V8_GNUC_PREREQ(2, 96, 0)) |
258 | # define V8_HAS_BUILTIN_FRAME_ADDRESS (V8_GNUC_PREREQ(2, 96, 0)) |
259 | # define V8_HAS_BUILTIN_POPCOUNT (V8_GNUC_PREREQ(3, 4, 0)) |
260 | |
261 | #endif |
262 | |
263 | #if defined(_MSC_VER) |
264 | # define V8_CC_MSVC 1 |
265 | |
266 | # define V8_HAS_DECLSPEC_DEPRECATED 1 |
267 | # define V8_HAS_DECLSPEC_NOINLINE 1 |
268 | # define V8_HAS_DECLSPEC_SELECTANY 1 |
269 | # define V8_HAS_DECLSPEC_NORETURN 1 |
270 | |
271 | # define V8_HAS___FORCEINLINE 1 |
272 | |
273 | #endif |
274 | |
275 | |
276 | // ----------------------------------------------------------------------------- |
277 | // Helper macros |
278 | |
279 | // A macro used to make better inlining. Don't bother for debug builds. |
280 | // Use like: |
281 | // V8_INLINE int GetZero() { return 0; } |
282 | #if !defined(DEBUG) && V8_HAS_ATTRIBUTE_ALWAYS_INLINE |
283 | # define V8_INLINE inline __attribute__((always_inline)) |
284 | #elif !defined(DEBUG) && V8_HAS___FORCEINLINE |
285 | # define V8_INLINE __forceinline |
286 | #else |
287 | # define V8_INLINE inline |
288 | #endif |
289 | |
290 | |
291 | // A macro used to tell the compiler to never inline a particular function. |
292 | // Don't bother for debug builds. |
293 | // Use like: |
294 | // V8_NOINLINE int GetMinusOne() { return -1; } |
295 | #if !defined(DEBUG) && V8_HAS_ATTRIBUTE_NOINLINE |
296 | # define V8_NOINLINE __attribute__((noinline)) |
297 | #elif !defined(DEBUG) && V8_HAS_DECLSPEC_NOINLINE |
298 | # define V8_NOINLINE __declspec(noinline) |
299 | #else |
300 | # define V8_NOINLINE /* NOT SUPPORTED */ |
301 | #endif |
302 | |
303 | |
304 | // A macro (V8_DEPRECATED) to mark classes or functions as deprecated. |
305 | #if defined(V8_DEPRECATION_WARNINGS) && V8_HAS_ATTRIBUTE_DEPRECATED_MESSAGE |
306 | #define V8_DEPRECATED(message, declarator) \ |
307 | declarator __attribute__((deprecated(message))) |
308 | #elif defined(V8_DEPRECATION_WARNINGS) && V8_HAS_ATTRIBUTE_DEPRECATED |
309 | #define V8_DEPRECATED(message, declarator) \ |
310 | declarator __attribute__((deprecated)) |
311 | #elif defined(V8_DEPRECATION_WARNINGS) && V8_HAS_DECLSPEC_DEPRECATED |
312 | #define V8_DEPRECATED(message, declarator) __declspec(deprecated) declarator |
313 | #else |
314 | #define V8_DEPRECATED(message, declarator) declarator |
315 | #endif |
316 | |
317 | |
318 | // A macro (V8_DEPRECATE_SOON) to make it easier to see what will be deprecated. |
319 | #if defined(V8_IMMINENT_DEPRECATION_WARNINGS) && \ |
320 | V8_HAS_ATTRIBUTE_DEPRECATED_MESSAGE |
321 | #define V8_DEPRECATE_SOON(message, declarator) \ |
322 | declarator __attribute__((deprecated(message))) |
323 | #elif defined(V8_IMMINENT_DEPRECATION_WARNINGS) && V8_HAS_ATTRIBUTE_DEPRECATED |
324 | #define V8_DEPRECATE_SOON(message, declarator) \ |
325 | declarator __attribute__((deprecated)) |
326 | #elif defined(V8_IMMINENT_DEPRECATION_WARNINGS) && V8_HAS_DECLSPEC_DEPRECATED |
327 | #define V8_DEPRECATE_SOON(message, declarator) __declspec(deprecated) declarator |
328 | #else |
329 | #define V8_DEPRECATE_SOON(message, declarator) declarator |
330 | #endif |
331 | |
332 | |
333 | // A macro to provide the compiler with branch prediction information. |
334 | #if V8_HAS_BUILTIN_EXPECT |
335 | # define V8_UNLIKELY(condition) (__builtin_expect(!!(condition), 0)) |
336 | # define V8_LIKELY(condition) (__builtin_expect(!!(condition), 1)) |
337 | #else |
338 | # define V8_UNLIKELY(condition) (condition) |
339 | # define V8_LIKELY(condition) (condition) |
340 | #endif |
341 | |
342 | |
343 | // Annotate a function indicating the caller must examine the return value. |
344 | // Use like: |
345 | // int foo() V8_WARN_UNUSED_RESULT; |
346 | #if V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT |
347 | #define V8_WARN_UNUSED_RESULT __attribute__((warn_unused_result)) |
348 | #else |
349 | #define V8_WARN_UNUSED_RESULT /* NOT SUPPORTED */ |
350 | #endif |
351 | |
352 | #ifdef V8_OS_WIN |
353 | |
354 | // Setup for Windows DLL export/import. When building the V8 DLL the |
355 | // BUILDING_V8_SHARED needs to be defined. When building a program which uses |
356 | // the V8 DLL USING_V8_SHARED needs to be defined. When either building the V8 |
357 | // static library or building a program which uses the V8 static library neither |
358 | // BUILDING_V8_SHARED nor USING_V8_SHARED should be defined. |
359 | #ifdef BUILDING_V8_SHARED |
360 | # define V8_EXPORT __declspec(dllexport) |
361 | #elif USING_V8_SHARED |
362 | # define V8_EXPORT __declspec(dllimport) |
363 | #else |
364 | # define V8_EXPORT |
365 | #endif // BUILDING_V8_SHARED |
366 | |
367 | #else // V8_OS_WIN |
368 | |
369 | // Setup for Linux shared library export. |
370 | #if V8_HAS_ATTRIBUTE_VISIBILITY |
371 | # ifdef BUILDING_V8_SHARED |
372 | # define V8_EXPORT __attribute__ ((visibility("default"))) |
373 | # else |
374 | # define V8_EXPORT |
375 | # endif |
376 | #else |
377 | # define V8_EXPORT |
378 | #endif |
379 | |
380 | #endif // V8_OS_WIN |
381 | |
382 | // clang-format on |
383 | |
384 | #endif // V8CONFIG_H_ |
385 | |