[linux-2.6-block.git] / include / linux / compiler-clang.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_COMPILER_TYPES_H
#error "Please don't include <linux/compiler-clang.h> directly, include <linux/compiler.h> instead."
#endif

/* Some compiler specific definitions are overwritten here
 * for Clang compiler
 */
#define uninitialized_var(x) x = *(&(x))

/* same as gcc, this was present in clang-2.6 so we can assume it works
 * with any version that can compile the kernel
 */
#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)

/* all clang versions usable with the kernel support KASAN ABI version 5 */
#define KASAN_ABI_VERSION 5

#if __has_feature(address_sanitizer) || __has_feature(hwaddress_sanitizer)
/* emulate gcc's __SANITIZE_ADDRESS__ flag */
#define __SANITIZE_ADDRESS__
#define __no_sanitize_address \
		__attribute__((no_sanitize("address", "hwaddress")))
#else
#define __no_sanitize_address
#endif

/*
 * Not all versions of clang implement the the type-generic versions
 * of the builtin overflow checkers. Fortunately, clang implements
 * __has_builtin allowing us to avoid awkward version
 * checks. Unfortunately, we don't know which version of gcc clang
 * pretends to be, so the macro may or may not be defined.
 */
#if __has_builtin(__builtin_mul_overflow) && \
    __has_builtin(__builtin_add_overflow) && \
    __has_builtin(__builtin_sub_overflow)
#define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
#endif

/* The following are for compatibility with GCC, from compiler-gcc.h,
 * and may be redefined here because they should not be shared with other
 * compilers, like ICC.
 */
#define barrier() __asm__ __volatile__("" : : : "memory")
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
d1515582	2	#ifndef __LINUX_COMPILER_TYPES_H
565cbdc2 MC	3	#error "Please don't include <linux/compiler-clang.h> directly, include <linux/compiler.h> instead."
	4	#endif
	5
	6	/* Some compiler specific definitions are overwritten here
	7	* for Clang compiler
	8	*/
565cbdc2	9	#define uninitialized_var(x) x = *(&(x))
b41c29b0 AB	10
	11	/* same as gcc, this was present in clang-2.6 so we can assume it works
	12	* with any version that can compile the kernel
	13	*/
	14	#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
4ca59b14	15
53a98ed7 PL	16	/* all clang versions usable with the kernel support KASAN ABI version 5 */
	17	#define KASAN_ABI_VERSION 5
	18
2bd926b4	19	#if __has_feature(address_sanitizer) \|\| __has_feature(hwaddress_sanitizer)
53a98ed7	20	/* emulate gcc's __SANITIZE_ADDRESS__ flag */
53a98ed7	21	#define __SANITIZE_ADDRESS__
2bd926b4 AK	22	#define __no_sanitize_address \
	23	__attribute__((no_sanitize("address", "hwaddress")))
	24	#else
	25	#define __no_sanitize_address
53a98ed7	26	#endif
87358710	27
f0907827 RV	28	/*
	29	* Not all versions of clang implement the the type-generic versions
	30	* of the builtin overflow checkers. Fortunately, clang implements
	31	* __has_builtin allowing us to avoid awkward version
	32	* checks. Unfortunately, we don't know which version of gcc clang
	33	* pretends to be, so the macro may or may not be defined.
	34	*/
f0907827 RV	35	#if __has_builtin(__builtin_mul_overflow) && \
	36	__has_builtin(__builtin_add_overflow) && \
	37	__has_builtin(__builtin_sub_overflow)
	38	#define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
	39	#endif
815f0ddb ND	40
	41	/* The following are for compatibility with GCC, from compiler-gcc.h,
	42	* and may be redefined here because they should not be shared with other
	43	* compilers, like ICC.
	44	*/
	45	#define barrier() __asm__ __volatile__("" : : : "memory")