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84 lines
3.0 KiB
84 lines
3.0 KiB
#ifndef _LINUX_BUILD_BUG_H |
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#define _LINUX_BUILD_BUG_H |
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#include <linux/compiler.h> |
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#ifdef __CHECKER__ |
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#define __BUILD_BUG_ON_NOT_POWER_OF_2(n) (0) |
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#define BUILD_BUG_ON_NOT_POWER_OF_2(n) (0) |
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#define BUILD_BUG_ON_ZERO(e) (0) |
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#define BUILD_BUG_ON_NULL(e) ((void *)0) |
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#define BUILD_BUG_ON_INVALID(e) (0) |
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#define BUILD_BUG_ON_MSG(cond, msg) (0) |
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#define BUILD_BUG_ON(condition) (0) |
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#define BUILD_BUG() (0) |
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#else /* __CHECKER__ */ |
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/* Force a compilation error if a constant expression is not a power of 2 */ |
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#define __BUILD_BUG_ON_NOT_POWER_OF_2(n) \ |
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BUILD_BUG_ON(((n) & ((n) - 1)) != 0) |
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#define BUILD_BUG_ON_NOT_POWER_OF_2(n) \ |
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BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0)) |
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/* |
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* Force a compilation error if condition is true, but also produce a |
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* result (of value 0 and type size_t), so the expression can be used |
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* e.g. in a structure initializer (or where-ever else comma expressions |
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* aren't permitted). |
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*/ |
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#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:(-!!(e)); })) |
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#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:(-!!(e)); })) |
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/* |
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* BUILD_BUG_ON_INVALID() permits the compiler to check the validity of the |
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* expression but avoids the generation of any code, even if that expression |
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* has side-effects. |
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*/ |
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#define BUILD_BUG_ON_INVALID(e) ((void)(sizeof((__force long)(e)))) |
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/** |
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* BUILD_BUG_ON_MSG - break compile if a condition is true & emit supplied |
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* error message. |
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* @condition: the condition which the compiler should know is false. |
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* |
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* See BUILD_BUG_ON for description. |
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*/ |
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#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) |
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/** |
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* BUILD_BUG_ON - break compile if a condition is true. |
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* @condition: the condition which the compiler should know is false. |
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* |
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* If you have some code which relies on certain constants being equal, or |
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* some other compile-time-evaluated condition, you should use BUILD_BUG_ON to |
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* detect if someone changes it. |
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* |
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* The implementation uses gcc's reluctance to create a negative array, but gcc |
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* (as of 4.4) only emits that error for obvious cases (e.g. not arguments to |
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* inline functions). Luckily, in 4.3 they added the "error" function |
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* attribute just for this type of case. Thus, we use a negative sized array |
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* (should always create an error on gcc versions older than 4.4) and then call |
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* an undefined function with the error attribute (should always create an |
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* error on gcc 4.3 and later). If for some reason, neither creates a |
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* compile-time error, we'll still have a link-time error, which is harder to |
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* track down. |
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*/ |
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#ifndef __OPTIMIZE__ |
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#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) |
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#else |
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#define BUILD_BUG_ON(condition) \ |
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BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition) |
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#endif |
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/** |
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* BUILD_BUG - break compile if used. |
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* |
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* If you have some code that you expect the compiler to eliminate at |
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* build time, you should use BUILD_BUG to detect if it is |
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* unexpectedly used. |
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*/ |
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#define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed") |
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#endif /* __CHECKER__ */ |
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#endif /* _LINUX_BUILD_BUG_H */
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