/* 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

/* Compiler specific definitions 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

/* emulate gcc's __SANITIZE_ADDRESS__ flag */
#if __has_feature(address_sanitizer)
#define __SANITIZE_ADDRESS__
#endif

#define __no_sanitize_address __attribute__((no_sanitize("address")))

#if __has_feature(memory_sanitizer)
#define __SANITIZE_MEMORY__
/*
 * Unlike other sanitizers, KMSAN still inserts code into functions marked with
 * no_sanitize("kernel-memory"). Using disable_sanitizer_instrumentation
 * provides the behavior consistent with other __no_sanitize_ attributes,
 * guaranteeing that __no_sanitize_memory functions remain uninstrumented.
 */
#define __no_sanitize_memory __disable_sanitizer_instrumentation

/*
 * The __no_kmsan_checks attribute ensures that a function does not produce
 * false positive reports by:
 *  - initializing all local variables and memory stores in this function;
 *  - skipping all shadow checks;
 *  - passing initialized arguments to this function's callees.
 */
#define __no_kmsan_checks __attribute__((no_sanitize("kernel-memory")))
#else
#define __no_sanitize_memory
#define __no_kmsan_checks
#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 __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
#define __assume_aligned(a, ...)	\
	__attribute__((__assume_aligned__(a, ## __VA_ARGS__)))
