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