1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LINUX_COMPILER_TYPES_H
3 #define __LINUX_COMPILER_TYPES_H
9 # define __kernel __attribute__((address_space(0)))
10 # define __user __attribute__((noderef, address_space(__user)))
11 # define __iomem __attribute__((noderef, address_space(__iomem)))
12 # define __percpu __attribute__((noderef, address_space(__percpu)))
13 # define __rcu __attribute__((noderef, address_space(__rcu)))
14 static inline void __chk_user_ptr(const volatile void __user *ptr) { }
15 static inline void __chk_io_ptr(const volatile void __iomem *ptr) { }
17 # define __must_hold(x) __attribute__((context(x,1,1)))
18 # define __acquires(x) __attribute__((context(x,0,1)))
19 # define __releases(x) __attribute__((context(x,1,0)))
20 # define __acquire(x) __context__(x,1)
21 # define __release(x) __context__(x,-1)
22 # define __cond_lock(x,c) ((c) ? ({ __acquire(x); 1; }) : 0)
24 # define __force __attribute__((force))
25 # define __nocast __attribute__((nocast))
26 # define __safe __attribute__((safe))
27 # define __private __attribute__((noderef))
28 # define ACCESS_PRIVATE(p, member) (*((typeof((p)->member) __force *) &(p)->member))
29 #else /* __CHECKER__ */
32 # ifdef STRUCTLEAK_PLUGIN
33 # define __user __attribute__((user))
40 # define __chk_user_ptr(x) (void)0
41 # define __chk_io_ptr(x) (void)0
43 # define __must_hold(x)
44 # define __acquires(x)
45 # define __releases(x)
46 # define __acquire(x) (void)0
47 # define __release(x) (void)0
48 # define __cond_lock(x,c) (c)
54 # define ACCESS_PRIVATE(p, member) ((p)->member)
55 # define __builtin_warning(x, y...) (1)
56 #endif /* __CHECKER__ */
58 /* Indirect macros required for expanded argument pasting, eg. __LINE__. */
59 #define ___PASTE(a,b) a##b
60 #define __PASTE(a,b) ___PASTE(a,b)
65 #include <linux/compiler_attributes.h>
70 * __has_builtin is supported on gcc >= 10, clang >= 3 and icc >= 21.
71 * In the meantime, to support gcc < 10, we implement __has_builtin
75 #define __has_builtin(x) (0)
78 /* Compiler specific macros. */
80 #include <linux/compiler-clang.h>
81 #elif defined(__INTEL_COMPILER)
82 #include <linux/compiler-intel.h>
83 #elif defined(__GNUC__)
84 /* The above compilers also define __GNUC__, so order is important here. */
85 #include <linux/compiler-gcc.h>
87 #error "Unknown compiler"
91 * Some architectures need to provide custom definitions of macros provided
92 * by linux/compiler-*.h, and can do so using asm/compiler.h. We include that
93 * conditionally rather than using an asm-generic wrapper in order to avoid
94 * build failures if any C compilation, which will include this file via an
95 * -include argument in c_flags, occurs prior to the asm-generic wrappers being
98 #ifdef CONFIG_HAVE_ARCH_COMPILER_H
99 #include <asm/compiler.h>
102 struct ftrace_branch_data {
108 unsigned long correct;
109 unsigned long incorrect;
115 unsigned long miss_hit[2];
119 struct ftrace_likely_data {
120 struct ftrace_branch_data data;
121 unsigned long constant;
124 #ifdef CONFIG_ENABLE_MUST_CHECK
125 #define __must_check __attribute__((__warn_unused_result__))
130 #if defined(CC_USING_HOTPATCH)
131 #define notrace __attribute__((hotpatch(0, 0)))
132 #elif defined(CC_USING_PATCHABLE_FUNCTION_ENTRY)
133 #define notrace __attribute__((patchable_function_entry(0, 0)))
135 #define notrace __attribute__((__no_instrument_function__))
139 * it doesn't make sense on ARM (currently the only user of __naked)
140 * to trace naked functions because then mcount is called without
141 * stack and frame pointer being set up and there is no chance to
142 * restore the lr register to the value before mcount was called.
144 #define __naked __attribute__((__naked__)) notrace
146 #define __compiler_offsetof(a, b) __builtin_offsetof(a, b)
149 * Prefer gnu_inline, so that extern inline functions do not emit an
150 * externally visible function. This makes extern inline behave as per gnu89
151 * semantics rather than c99. This prevents multiple symbol definition errors
152 * of extern inline functions at link time.
153 * A lot of inline functions can cause havoc with function tracing.
155 #define inline inline __gnu_inline __inline_maybe_unused notrace
158 * gcc provides both __inline__ and __inline as alternate spellings of
159 * the inline keyword, though the latter is undocumented. New kernel
160 * code should only use the inline spelling, but some existing code
161 * uses __inline__. Since we #define inline above, to ensure
162 * __inline__ has the same semantics, we need this #define.
164 * However, the spelling __inline is strictly reserved for referring
165 * to the bare keyword.
167 #define __inline__ inline
170 * GCC does not warn about unused static inline functions for -Wunused-function.
171 * Suppress the warning in clang as well by using __maybe_unused, but enable it
172 * for W=1 build. This will allow clang to find unused functions. Remove the
173 * __inline_maybe_unused entirely after fixing most of -Wunused-function warnings.
175 #ifdef KBUILD_EXTRA_WARN1
176 #define __inline_maybe_unused
178 #define __inline_maybe_unused __maybe_unused
182 * Rather then using noinline to prevent stack consumption, use
183 * noinline_for_stack instead. For documentation reasons.
185 #define noinline_for_stack noinline
188 * Sanitizer helper attributes: Because using __always_inline and
189 * __no_sanitize_* conflict, provide helper attributes that will either expand
190 * to __no_sanitize_* in compilation units where instrumentation is enabled
191 * (__SANITIZE_*__), or __always_inline in compilation units without
192 * instrumentation (__SANITIZE_*__ undefined).
194 #ifdef __SANITIZE_ADDRESS__
196 * We can't declare function 'inline' because __no_sanitize_address conflicts
197 * with inlining. Attempt to inline it may cause a build failure.
198 * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67368
199 * '__maybe_unused' allows us to avoid defined-but-not-used warnings.
201 # define __no_kasan_or_inline __no_sanitize_address notrace __maybe_unused
202 # define __no_sanitize_or_inline __no_kasan_or_inline
204 # define __no_kasan_or_inline __always_inline
207 #define __no_kcsan __no_sanitize_thread
208 #ifdef __SANITIZE_THREAD__
209 # define __no_sanitize_or_inline __no_kcsan notrace __maybe_unused
212 #ifndef __no_sanitize_or_inline
213 #define __no_sanitize_or_inline __always_inline
216 /* Section for code which can't be instrumented at all */
218 noinline notrace __attribute((__section__(".noinstr.text"))) \
219 __no_kcsan __no_sanitize_address
221 #endif /* __KERNEL__ */
223 #endif /* __ASSEMBLY__ */
226 * The below symbols may be defined for one or more, but not ALL, of the above
227 * compilers. We don't consider that to be an error, so set them to nothing.
228 * For example, some of them are for compiler specific plugins.
230 #ifndef __latent_entropy
231 # define __latent_entropy
234 #ifndef __randomize_layout
235 # define __randomize_layout __designated_init
238 #ifndef __no_randomize_layout
239 # define __no_randomize_layout
242 #ifndef randomized_struct_fields_start
243 # define randomized_struct_fields_start
244 # define randomized_struct_fields_end
251 #ifndef asm_volatile_goto
252 #define asm_volatile_goto(x...) asm goto(x)
255 #ifdef CONFIG_CC_HAS_ASM_INLINE
256 #define asm_inline asm __inline
258 #define asm_inline asm
261 /* Are two types/vars the same type (ignoring qualifiers)? */
262 #define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
265 * __unqual_scalar_typeof(x) - Declare an unqualified scalar type, leaving
266 * non-scalar types unchanged.
269 * Prefer C11 _Generic for better compile-times and simpler code. Note: 'char'
270 * is not type-compatible with 'signed char', and we define a separate case.
272 #define __scalar_type_to_expr_cases(type) \
273 unsigned type: (unsigned type)0, \
274 signed type: (signed type)0
276 #define __unqual_scalar_typeof(x) typeof( \
279 __scalar_type_to_expr_cases(char), \
280 __scalar_type_to_expr_cases(short), \
281 __scalar_type_to_expr_cases(int), \
282 __scalar_type_to_expr_cases(long), \
283 __scalar_type_to_expr_cases(long long), \
286 /* Is this type a native word size -- useful for atomic operations */
287 #define __native_word(t) \
288 (sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || \
289 sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long))
291 /* Compile time object size, -1 for unknown */
292 #ifndef __compiletime_object_size
293 # define __compiletime_object_size(obj) -1
295 #ifndef __compiletime_warning
296 # define __compiletime_warning(message)
298 #ifndef __compiletime_error
299 # define __compiletime_error(message)
303 # define __compiletime_assert(condition, msg, prefix, suffix) \
305 extern void prefix ## suffix(void) __compiletime_error(msg); \
307 prefix ## suffix(); \
310 # define __compiletime_assert(condition, msg, prefix, suffix) do { } while (0)
313 #define _compiletime_assert(condition, msg, prefix, suffix) \
314 __compiletime_assert(condition, msg, prefix, suffix)
317 * compiletime_assert - break build and emit msg if condition is false
318 * @condition: a compile-time constant condition to check
319 * @msg: a message to emit if condition is false
321 * In tradition of POSIX assert, this macro will break the build if the
322 * supplied condition is *false*, emitting the supplied error message if the
323 * compiler has support to do so.
325 #define compiletime_assert(condition, msg) \
326 _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
328 #define compiletime_assert_atomic_type(t) \
329 compiletime_assert(__native_word(t), \
330 "Need native word sized stores/loads for atomicity.")
332 /* Helpers for emitting diagnostics in pragmas. */
334 #define __diag(string)
338 #define __diag_GCC(version, severity, string)
341 #define __diag_push() __diag(push)
342 #define __diag_pop() __diag(pop)
344 #define __diag_ignore(compiler, version, option, comment) \
345 __diag_ ## compiler(version, ignore, option)
346 #define __diag_warn(compiler, version, option, comment) \
347 __diag_ ## compiler(version, warn, option)
348 #define __diag_error(compiler, version, option, comment) \
349 __diag_ ## compiler(version, error, option)
351 #endif /* __LINUX_COMPILER_TYPES_H */