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/*
* debug.h
*
* Copyright (C) 2016 SUSE. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
*/
#ifndef __DEBUG_H__
#define __DEBUG_H__
#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
extern int verbose;
extern int debug;
extern int quiet;
#define likely(x) __builtin_expect(!!(x), 1)
#define unlikely(x) __builtin_expect(!!(x), 0)
#define dprintf(args...) if (debug) printf(args)
#define vprintf(args...) if (verbose) printf(args)
#define qprintf(args...) if (!quiet) printf(args)
void print_stack_trace(void);/* defined in util.c */
#define abort_lineno() do { \
printf("ERROR: %s:%d\n", __FILE__, __LINE__); \
print_stack_trace(); \
abort(); \
} while (0)
#define abort_on(condition) do { \
if (unlikely(condition)) { \
printf("ERROR: %s:%d\n", __FILE__, __LINE__); \
print_stack_trace(); \
abort(); \
} \
} while(0)
/*
* compiletime_assert and associated code taken from
* linux-3.14.git/include/linux/compiler.h
*/
# define __compiletime_warning(message)
# define __compiletime_error(message)
/*
* Sparse complains of variable sized arrays due to the temporary variable in
* __compiletime_assert. Unfortunately we can't just expand it out to make
* sparse see a constant array size without breaking compiletime_assert on old
* versions of GCC (e.g. 4.2.4), so hide the array from sparse altogether.
*/
#define __compiletime_error_fallback(condition) \
do { ((void)sizeof(char[1 - 2 * condition])); } while (0)
#define __compiletime_assert(condition, msg, prefix, suffix) \
do { \
bool __cond = !(condition); \
extern void prefix ## suffix(void) __compiletime_error(msg); \
if (__cond) \
prefix ## suffix(); \
__compiletime_error_fallback(__cond); \
} while (0)
/**
* compiletime_assert - break build and emit msg if condition is false
* @condition: a compile-time constant condition to check
* @msg: a message to emit if condition is false
*
* In tradition of POSIX assert, this macro will break the build if the
* supplied condition is *false*, emitting the supplied error message if the
* compiler has support to do so.
*/
#define compiletime_assert(condition, msg) \
__compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
/*
* BUILD_BUG_ON() and associated code taken from
* linux-2.6.git/include/linux/bug.h
*/
/**
* 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
#endif /* __DEBUG_H__ */
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