Zycore 1.2.0.0
Defines.h
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1/***************************************************************************************************
2
3 Zyan Core Library (Zycore-C)
4
5 Original Author : Florian Bernd, Joel Hoener
6
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in all
15 * copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24
25***************************************************************************************************/
26
32#ifndef ZYCORE_DEFINES_H
33#define ZYCORE_DEFINES_H
34
35/* ============================================================================================== */
36/* Meta macros */
37/* ============================================================================================== */
38
47#define ZYAN_MACRO_CONCAT(x, y) x ## y
48
58#define ZYAN_MACRO_CONCAT_EXPAND(x, y) ZYAN_MACRO_CONCAT(x, y)
59
60/* ============================================================================================== */
61/* Compiler detection */
62/* ============================================================================================== */
63
64#if defined(__clang__)
65# define ZYAN_CLANG
66# define ZYAN_GNUC
67#elif defined(__ICC) || defined(__INTEL_COMPILER)
68# define ZYAN_ICC
69#elif defined(__GNUC__) || defined(__GNUG__)
70# define ZYAN_GCC
71# define ZYAN_GNUC
72#elif defined(_MSC_VER)
73# define ZYAN_MSVC
74#elif defined(__BORLANDC__)
75# define ZYAN_BORLAND
76#else
77# define ZYAN_UNKNOWN_COMPILER
78#endif
79
80/* ============================================================================================== */
81/* Platform detection */
82/* ============================================================================================== */
83
84#if defined(_WIN32)
85# define ZYAN_WINDOWS
86#elif defined(__EMSCRIPTEN__)
87# define ZYAN_EMSCRIPTEN
88#elif defined(__wasi__) || defined(__WASI__)
89// via: https://reviews.llvm.org/D57155
90# define ZYAN_WASI
91#elif defined(__APPLE__)
92# define ZYAN_APPLE
93# define ZYAN_POSIX
94#elif defined(__linux)
95# define ZYAN_LINUX
96# define ZYAN_POSIX
97#elif defined(__FreeBSD__)
98# define ZYAN_FREEBSD
99# define ZYAN_POSIX
100#elif defined(sun) || defined(__sun)
101# define ZYAN_SOLARIS
102# define ZYAN_POSIX
103#elif defined(__unix)
104# define ZYAN_UNIX
105# define ZYAN_POSIX
106#elif defined(__posix)
107# define ZYAN_POSIX
108#else
109# define ZYAN_UNKNOWN_PLATFORM
110#endif
111
112/* ============================================================================================== */
113/* Kernel mode detection */
114/* ============================================================================================== */
115
116#if (defined(ZYAN_WINDOWS) && defined(_KERNEL_MODE)) || \
117 (defined(ZYAN_APPLE) && defined(KERNEL)) || \
118 (defined(ZYAN_LINUX) && defined(__KERNEL__)) || \
119 (defined(__FreeBSD_kernel__))
120# define ZYAN_KERNEL
121#else
122# define ZYAN_USER
123#endif
124
125/* ============================================================================================== */
126/* Architecture detection */
127/* ============================================================================================== */
128
129#if defined(_M_AMD64) || defined(__x86_64__)
130# define ZYAN_X64
131#elif defined(_M_IX86) || defined(__i386__)
132# define ZYAN_X86
133#elif defined(_M_ARM64) || defined(__aarch64__)
134# define ZYAN_AARCH64
135#elif defined(_M_ARM) || defined(_M_ARMT) || defined(__arm__) || defined(__thumb__)
136# define ZYAN_ARM
137#elif defined(__EMSCRIPTEN__) || defined(__wasm__) || defined(__WASM__)
138# define ZYAN_WASM
139#else
140# error "Unsupported architecture detected"
141#endif
142
143/* ============================================================================================== */
144/* Debug/Release detection */
145/* ============================================================================================== */
146
147#if defined(ZYAN_MSVC) || defined(ZYAN_BORLAND)
148# ifdef _DEBUG
149# define ZYAN_DEBUG
150# else
151# define ZYAN_RELEASE
152# endif
153#elif defined(ZYAN_GNUC) || defined(ZYAN_ICC)
154# ifdef NDEBUG
155# define ZYAN_RELEASE
156# else
157# define ZYAN_DEBUG
158# endif
159#else
160# define ZYAN_RELEASE
161#endif
162
163/* ============================================================================================== */
164/* Deprecation hint */
165/* ============================================================================================== */
166
167#if defined(ZYAN_GCC) || defined(ZYAN_CLANG)
168# define ZYAN_DEPRECATED __attribute__((__deprecated__))
169#elif defined(ZYAN_MSVC)
170# define ZYAN_DEPRECATED __declspec(deprecated)
171#else
172# define ZYAN_DEPRECATED
173#endif
174
175/* ============================================================================================== */
176/* Generic DLL import/export helpers */
177/* ============================================================================================== */
178
179#if defined(ZYAN_MSVC)
180# define ZYAN_DLLEXPORT __declspec(dllexport)
181# define ZYAN_DLLIMPORT __declspec(dllimport)
182#else
183# define ZYAN_DLLEXPORT
184# define ZYAN_DLLIMPORT
185#endif
186
187/* ============================================================================================== */
188/* Zycore dll{export,import} */
189/* ============================================================================================== */
190
191// This is a cut-down version of what CMake's `GenerateExportHeader` would usually generate. To
192// simplify builds without CMake, we define these things manually instead of relying on CMake
193// to generate the header.
194//
195// For static builds, our CMakeList will define `ZYCORE_STATIC_BUILD`. For shared library builds,
196// our CMake will define `ZYCORE_SHOULD_EXPORT` depending on whether the target is being imported or
197// exported. If CMake isn't used, users can manually define these to fit their use-case.
198
199// Backward compatibility: CMake would previously generate these variables names. However, because
200// they have pretty cryptic names, we renamed them when we got rid of `GenerateExportHeader`. For
201// backward compatibility for users that don't use CMake and previously manually defined these, we
202// translate the old defines here and print a warning.
203#if defined(ZYCORE_STATIC_DEFINE)
204# pragma message("ZYCORE_STATIC_DEFINE was renamed to ZYCORE_STATIC_BUILD.")
205# define ZYCORE_STATIC_BUILD
206#endif
207#if defined(Zycore_EXPORTS)
208# pragma message("Zycore_EXPORTS was renamed to ZYCORE_SHOULD_EXPORT.")
209# define ZYCORE_SHOULD_EXPORT
210#endif
211
215#if defined(ZYCORE_STATIC_BUILD)
216# define ZYCORE_EXPORT
217#else
218# if defined(ZYCORE_SHOULD_EXPORT)
219# define ZYCORE_EXPORT ZYAN_DLLEXPORT
220# else
221# define ZYCORE_EXPORT ZYAN_DLLIMPORT
222# endif
223#endif
224
228#define ZYCORE_NO_EXPORT
229
230/* ============================================================================================== */
231/* Misc compatibility macros */
232/* ============================================================================================== */
233
234#if defined(ZYAN_CLANG)
235# define ZYAN_NO_SANITIZE(what) __attribute__((no_sanitize(what)))
236#else
237# define ZYAN_NO_SANITIZE(what)
238#endif
239
240#if defined(ZYAN_MSVC) || defined(ZYAN_BORLAND)
241# define ZYAN_INLINE __inline
242#else
243# define ZYAN_INLINE static inline
244#endif
245
246#if defined(ZYAN_MSVC)
247# define ZYAN_NOINLINE __declspec(noinline)
248#elif defined(ZYAN_GCC) || defined(ZYAN_CLANG)
249# define ZYAN_NOINLINE __attribute__((noinline))
250#else
251# define ZYAN_NOINLINE
252#endif
253
254/* ============================================================================================== */
255/* Debugging and optimization macros */
256/* ============================================================================================== */
257
261#if defined(ZYAN_NO_LIBC)
262# define ZYAN_ASSERT(condition) (void)(condition)
263#elif defined(ZYAN_WINDOWS) && defined(ZYAN_KERNEL)
264# include <wdm.h>
265# define ZYAN_ASSERT(condition) NT_ASSERT(condition)
266#else
267# include <assert.h>
268# define ZYAN_ASSERT(condition) assert(condition)
269#endif
270
274#if __STDC_VERSION__ >= 201112L && !defined(__cplusplus)
275# define ZYAN_STATIC_ASSERT(x) _Static_assert(x, #x)
276#elif (defined(__cplusplus) && __cplusplus >= 201103L) || \
277 (defined(__cplusplus) && defined (_MSC_VER) && (_MSC_VER >= 1600)) || \
278 (defined (_MSC_VER) && (_MSC_VER >= 1800))
279# define ZYAN_STATIC_ASSERT(x) static_assert(x, #x)
280#else
281# define ZYAN_STATIC_ASSERT(x) \
282 typedef int ZYAN_MACRO_CONCAT_EXPAND(ZYAN_SASSERT_, __COUNTER__) [(x) ? 1 : -1]
283#endif
284
288#if defined(ZYAN_RELEASE)
289# if defined(ZYAN_CLANG) // GCC eagerly evals && RHS, we have to use nested ifs.
290# if __has_builtin(__builtin_unreachable)
291# define ZYAN_UNREACHABLE __builtin_unreachable()
292# else
293# define ZYAN_UNREACHABLE for(;;)
294# endif
295# elif defined(ZYAN_GCC) && ((__GNUC__ == 4 && __GNUC_MINOR__ > 4) || __GNUC__ > 4)
296# define ZYAN_UNREACHABLE __builtin_unreachable()
297# elif defined(ZYAN_ICC)
298# ifdef ZYAN_WINDOWS
299# include <stdlib.h> // "missing return statement" workaround
300# define ZYAN_UNREACHABLE __assume(0); (void)abort()
301# else
302# define ZYAN_UNREACHABLE __builtin_unreachable()
303# endif
304# elif defined(ZYAN_MSVC)
305# define ZYAN_UNREACHABLE __assume(0)
306# else
307# define ZYAN_UNREACHABLE for(;;)
308# endif
309#elif defined(ZYAN_NO_LIBC)
310# define ZYAN_UNREACHABLE for(;;)
311#elif defined(ZYAN_WINDOWS) && defined(ZYAN_KERNEL)
312# define ZYAN_UNREACHABLE { __fastfail(0); for(;;){} }
313#else
314# include <stdlib.h>
315# define ZYAN_UNREACHABLE { assert(0); abort(); }
316#endif
317
318/* ============================================================================================== */
319/* Utils */
320/* ============================================================================================== */
321
322/* ---------------------------------------------------------------------------------------------- */
323/* General purpose */
324/* ---------------------------------------------------------------------------------------------- */
325
331#define ZYAN_UNUSED(x) (void)(x)
332
336#if defined(ZYAN_GCC) && __GNUC__ >= 7
337# define ZYAN_FALLTHROUGH __attribute__((__fallthrough__))
338#else
339# define ZYAN_FALLTHROUGH
340#endif
341
347#define ZYAN_BITFIELD(x) : x
348
352#define ZYAN_REQUIRES_LIBC
353
360#if defined(__RESHARPER__)
361# define ZYAN_PRINTF_ATTR(format_index, first_to_check) \
362 [[gnu::format(printf, format_index, first_to_check)]]
363#elif defined(ZYAN_GCC)
364# define ZYAN_PRINTF_ATTR(format_index, first_to_check) \
365 __attribute__((format(printf, format_index, first_to_check)))
366#else
367# define ZYAN_PRINTF_ATTR(format_index, first_to_check)
368#endif
369
376#if defined(__RESHARPER__)
377# define ZYAN_WPRINTF_ATTR(format_index, first_to_check) \
378 [[rscpp::format(wprintf, format_index, first_to_check)]]
379#else
380# define ZYAN_WPRINTF_ATTR(format_index, first_to_check)
381#endif
382
383/* ---------------------------------------------------------------------------------------------- */
384/* Arrays */
385/* ---------------------------------------------------------------------------------------------- */
386
394#define ZYAN_ARRAY_LENGTH(a) (sizeof(a) / sizeof((a)[0]))
395
396/* ---------------------------------------------------------------------------------------------- */
397/* Arithmetic */
398/* ---------------------------------------------------------------------------------------------- */
399
408#define ZYAN_MIN(a, b) (((a) < (b)) ? (a) : (b))
409
418#define ZYAN_MAX(a, b) (((a) > (b)) ? (a) : (b))
419
427#define ZYAN_ABS(a) (((a) < 0) ? -(a) : (a))
428
438#define ZYAN_IS_POWER_OF_2(x) (((x) & ((x) - 1)) == 0)
439
445#define ZYAN_IS_ALIGNED_TO(x, align) (((x) & ((align) - 1)) == 0)
446
457#define ZYAN_ALIGN_UP(x, align) (((x) + (align) - 1) & ~((align) - 1))
458
469#define ZYAN_ALIGN_DOWN(x, align) (((x) - 1) & ~((align) - 1))
470
471/* ---------------------------------------------------------------------------------------------- */
472/* Bit operations */
473/* ---------------------------------------------------------------------------------------------- */
474
475/*
476 * Checks, if the bit at index `b` is required to present the ordinal value `n`.
477 *
478 * @param n The ordinal value.
479 * @param b The bit index.
480 *
481 * @return `ZYAN_TRUE`, if the bit at index `b` is required to present the ordinal value `n` or
482 * `ZYAN_FALSE`, if not.
483 *
484 * Note that this macro always returns `ZYAN_FALSE` for `n == 0`.
485 */
486#define ZYAN_NEEDS_BIT(n, b) (((unsigned long)(n) >> (b)) > 0)
487
488/*
489 * Returns the number of bits required to represent the ordinal value `n`.
490 *
491 * @param n The ordinal value.
492 *
493 * @return The number of bits required to represent the ordinal value `n`.
494 *
495 * Note that this macro returns `0` for `n == 0`.
496 */
497#define ZYAN_BITS_TO_REPRESENT(n) \
498 ( \
499 ZYAN_NEEDS_BIT(n, 0) + ZYAN_NEEDS_BIT(n, 1) + \
500 ZYAN_NEEDS_BIT(n, 2) + ZYAN_NEEDS_BIT(n, 3) + \
501 ZYAN_NEEDS_BIT(n, 4) + ZYAN_NEEDS_BIT(n, 5) + \
502 ZYAN_NEEDS_BIT(n, 6) + ZYAN_NEEDS_BIT(n, 7) + \
503 ZYAN_NEEDS_BIT(n, 8) + ZYAN_NEEDS_BIT(n, 9) + \
504 ZYAN_NEEDS_BIT(n, 10) + ZYAN_NEEDS_BIT(n, 11) + \
505 ZYAN_NEEDS_BIT(n, 12) + ZYAN_NEEDS_BIT(n, 13) + \
506 ZYAN_NEEDS_BIT(n, 14) + ZYAN_NEEDS_BIT(n, 15) + \
507 ZYAN_NEEDS_BIT(n, 16) + ZYAN_NEEDS_BIT(n, 17) + \
508 ZYAN_NEEDS_BIT(n, 18) + ZYAN_NEEDS_BIT(n, 19) + \
509 ZYAN_NEEDS_BIT(n, 20) + ZYAN_NEEDS_BIT(n, 21) + \
510 ZYAN_NEEDS_BIT(n, 22) + ZYAN_NEEDS_BIT(n, 23) + \
511 ZYAN_NEEDS_BIT(n, 24) + ZYAN_NEEDS_BIT(n, 25) + \
512 ZYAN_NEEDS_BIT(n, 26) + ZYAN_NEEDS_BIT(n, 27) + \
513 ZYAN_NEEDS_BIT(n, 28) + ZYAN_NEEDS_BIT(n, 29) + \
514 ZYAN_NEEDS_BIT(n, 30) + ZYAN_NEEDS_BIT(n, 31) \
515 )
516
517/* ---------------------------------------------------------------------------------------------- */
518
519/* ============================================================================================== */
520
521#endif /* ZYCORE_DEFINES_H */