include/linux/compiler_types.h

   1 #ifndef __LINUX_COMPILER_TYPES_H
   2 #define __LINUX_COMPILER_TYPES_H
   3
   4 #ifndef __ASSEMBLY__
   5
   6 #ifdef __CHECKER__
   7 # define __user         __attribute__((noderef, address_space(1)))
   8 # define __kernel       __attribute__((address_space(0)))
   9 # define __safe         __attribute__((safe))
  10 # define __force        __attribute__((force))
  11 # define __nocast       __attribute__((nocast))
  12 # define __iomem        __attribute__((noderef, address_space(2)))
  13 # define __must_hold(x) __attribute__((context(x,1,1)))
  14 # define __acquires(x)  __attribute__((context(x,0,1)))
  15 # define __releases(x)  __attribute__((context(x,1,0)))
  16 # define __acquire(x)   __context__(x,1)
  17 # define __release(x)   __context__(x,-1)
  18 # define __cond_lock(x,c)       ((c) ? ({ __acquire(x); 1; }) : 0)
  19 # define __percpu       __attribute__((noderef, address_space(3)))
  20 # define __rcu          __attribute__((noderef, address_space(4)))
  21 # define __private      __attribute__((noderef))
  22 extern void __chk_user_ptr(const volatile void __user *);
  23 extern void __chk_io_ptr(const volatile void __iomem *);
  24 # define ACCESS_PRIVATE(p, member) (*((typeof((p)->member) __force *) &(p)->member))
  25 #else /* __CHECKER__ */
  26 # ifdef STRUCTLEAK_PLUGIN
  27 #  define __user __attribute__((user))
  28 # else
  29 #  define __user
  30 # endif
  31 # define __kernel
  32 # define __safe
  33 # define __force
  34 # define __nocast
  35 # define __iomem
  36 # define __chk_user_ptr(x) (void)0
  37 # define __chk_io_ptr(x) (void)0
  38 # define __builtin_warning(x, y...) (1)
  39 # define __must_hold(x)
  40 # define __acquires(x)
  41 # define __releases(x)
  42 # define __acquire(x) (void)0
  43 # define __release(x) (void)0
  44 # define __cond_lock(x,c) (c)
  45 # define __percpu
  46 # define __rcu
  47 # define __private
  48 # define ACCESS_PRIVATE(p, member) ((p)->member)
  49 #endif /* __CHECKER__ */
  50
  51 /* Indirect macros required for expanded argument pasting, eg. __LINE__. */
  52 #define ___PASTE(a,b) a##b
  53 #define __PASTE(a,b) ___PASTE(a,b)
  54
  55 #ifdef __KERNEL__
  56
  57 #ifdef __GNUC__
  58 #include <linux/compiler-gcc.h>
  59 #endif
  60
  61 #if defined(CC_USING_HOTPATCH) && !defined(__CHECKER__)
  62 #define notrace __attribute__((hotpatch(0,0)))
  63 #else
  64 #define notrace __attribute__((no_instrument_function))
  65 #endif
  66
  67 /* Intel compiler defines __GNUC__. So we will overwrite implementations
  68  * coming from above header files here
  69  */
  70 #ifdef __INTEL_COMPILER
  71 # include <linux/compiler-intel.h>
  72 #endif
  73
  74 /* Clang compiler defines __GNUC__. So we will overwrite implementations
  75  * coming from above header files here
  76  */
  77 #ifdef __clang__
  78 #include <linux/compiler-clang.h>
  79 #endif
  80
  81 /*
  82  * Generic compiler-dependent macros required for kernel
  83  * build go below this comment. Actual compiler/compiler version
  84  * specific implementations come from the above header files
  85  */
  86
  87 struct ftrace_branch_data {
  88         const char *func;
  89         const char *file;
  90         unsigned line;
  91         union {
  92                 struct {
  93                         unsigned long correct;
  94                         unsigned long incorrect;
  95                 };
  96                 struct {
  97                         unsigned long miss;
  98                         unsigned long hit;
  99                 };
 100                 unsigned long miss_hit[2];
 101         };
 102 };
 103
 104 struct ftrace_likely_data {
 105         struct ftrace_branch_data       data;
 106         unsigned long                   constant;
 107 };
 108
 109 #endif /* __KERNEL__ */
 110
 111 #endif /* __ASSEMBLY__ */
 112
 113 #ifdef __KERNEL__
 114 /*
 115  * Allow us to mark functions as 'deprecated' and have gcc emit a nice
 116  * warning for each use, in hopes of speeding the functions removal.
 117  * Usage is:
 118  *              int __deprecated foo(void)
 119  */
 120 #ifndef __deprecated
 121 # define __deprecated           /* unimplemented */
 122 #endif
 123
 124 #ifdef MODULE
 125 #define __deprecated_for_modules __deprecated
 126 #else
 127 #define __deprecated_for_modules
 128 #endif
 129
 130 #ifndef __must_check
 131 #define __must_check
 132 #endif
 133
 134 #ifndef CONFIG_ENABLE_MUST_CHECK
 135 #undef __must_check
 136 #define __must_check
 137 #endif
 138 #ifndef CONFIG_ENABLE_WARN_DEPRECATED
 139 #undef __deprecated
 140 #undef __deprecated_for_modules
 141 #define __deprecated
 142 #define __deprecated_for_modules
 143 #endif
 144
 145 #ifndef __malloc
 146 #define __malloc
 147 #endif
 148
 149 /*
 150  * Allow us to avoid 'defined but not used' warnings on functions and data,
 151  * as well as force them to be emitted to the assembly file.
 152  *
 153  * As of gcc 3.4, static functions that are not marked with attribute((used))
 154  * may be elided from the assembly file.  As of gcc 3.4, static data not so
 155  * marked will not be elided, but this may change in a future gcc version.
 156  *
 157  * NOTE: Because distributions shipped with a backported unit-at-a-time
 158  * compiler in gcc 3.3, we must define __used to be __attribute__((used))
 159  * for gcc >=3.3 instead of 3.4.
 160  *
 161  * In prior versions of gcc, such functions and data would be emitted, but
 162  * would be warned about except with attribute((unused)).
 163  *
 164  * Mark functions that are referenced only in inline assembly as __used so
 165  * the code is emitted even though it appears to be unreferenced.
 166  */
 167 #ifndef __used
 168 # define __used                 /* unimplemented */
 169 #endif
 170
 171 #ifndef __maybe_unused
 172 # define __maybe_unused         /* unimplemented */
 173 #endif
 174
 175 #ifndef __always_unused
 176 # define __always_unused        /* unimplemented */
 177 #endif
 178
 179 #ifndef noinline
 180 #define noinline
 181 #endif
 182
 183 /*
 184  * Rather then using noinline to prevent stack consumption, use
 185  * noinline_for_stack instead.  For documentation reasons.
 186  */
 187 #define noinline_for_stack noinline
 188
 189 #ifndef __always_inline
 190 #define __always_inline inline
 191 #endif
 192
 193 #endif /* __KERNEL__ */
 194
 195 /*
 196  * From the GCC manual:
 197  *
 198  * Many functions do not examine any values except their arguments,
 199  * and have no effects except the return value.  Basically this is
 200  * just slightly more strict class than the `pure' attribute above,
 201  * since function is not allowed to read global memory.
 202  *
 203  * Note that a function that has pointer arguments and examines the
 204  * data pointed to must _not_ be declared `const'.  Likewise, a
 205  * function that calls a non-`const' function usually must not be
 206  * `const'.  It does not make sense for a `const' function to return
 207  * `void'.
 208  */
 209 #ifndef __attribute_const__
 210 # define __attribute_const__    /* unimplemented */
 211 #endif
 212
 213 #ifndef __designated_init
 214 # define __designated_init
 215 #endif
 216
 217 #ifndef __latent_entropy
 218 # define __latent_entropy
 219 #endif
 220
 221 #ifndef __randomize_layout
 222 # define __randomize_layout __designated_init
 223 #endif
 224
 225 #ifndef __no_randomize_layout
 226 # define __no_randomize_layout
 227 #endif
 228
 229 #ifndef randomized_struct_fields_start
 230 # define randomized_struct_fields_start
 231 # define randomized_struct_fields_end
 232 #endif
 233
 234 /*
 235  * Tell gcc if a function is cold. The compiler will assume any path
 236  * directly leading to the call is unlikely.
 237  */
 238
 239 #ifndef __cold
 240 #define __cold
 241 #endif
 242
 243 /* Simple shorthand for a section definition */
 244 #ifndef __section
 245 # define __section(S) __attribute__ ((__section__(#S)))
 246 #endif
 247
 248 #ifndef __visible
 249 #define __visible
 250 #endif
 251
 252 #ifndef __nostackprotector
 253 # define __nostackprotector
 254 #endif
 255
 256 /*
 257  * Assume alignment of return value.
 258  */
 259 #ifndef __assume_aligned
 260 #define __assume_aligned(a, ...)
 261 #endif
 262
 263
 264 /* Are two types/vars the same type (ignoring qualifiers)? */
 265 #ifndef __same_type
 266 # define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
 267 #endif
 268
 269 /* Is this type a native word size -- useful for atomic operations */
 270 #ifndef __native_word
 271 # define __native_word(t) (sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long))
 272 #endif
 273
 274 #endif /* __LINUX_COMPILER_TYPES_H */