drivers/staging/media/atomisp/pci/atomisp2/css2400/hive_isp_css_include/assert_support.h

   1 /*
   2  * Support for Intel Camera Imaging ISP subsystem.
   3  * Copyright (c) 2015, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  */
  14
  15 #ifndef __ASSERT_SUPPORT_H_INCLUDED__
  16 #define __ASSERT_SUPPORT_H_INCLUDED__
  17
  18 #include "storage_class.h"
  19
  20 /**
  21  * The following macro can help to test the size of a struct at compile
  22  * time rather than at run-time. It does not work for all compilers; see
  23  * below.
  24  *
  25  * Depending on the value of 'condition', the following macro is expanded to:
  26  * - condition==true:
  27  *     an expression containing an array declaration with negative size,
  28  *     usually resulting in a compilation error
  29  * - condition==false:
  30  *     (void) 1; // C statement with no effect
  31  *
  32  * example:
  33  *  COMPILATION_ERROR_IF( sizeof(struct host_sp_queues) != SIZE_OF_HOST_SP_QUEUES_STRUCT);
  34  *
  35  * verify that the macro indeed triggers a compilation error with your compiler:
  36  *  COMPILATION_ERROR_IF( sizeof(struct host_sp_queues) != (sizeof(struct host_sp_queues)+1) );
  37  *
  38  * Not all compilers will trigger an error with this macro; use a search engine to search for
  39  * BUILD_BUG_ON to find other methods.
  40  */
  41 #define COMPILATION_ERROR_IF(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
  42
  43 /* Compile time assertion */
  44 #ifndef CT_ASSERT
  45 #define CT_ASSERT(cnd) ((void)sizeof(char[(cnd)?1:-1]))
  46 #endif /* CT_ASSERT */
  47
  48 #ifdef NDEBUG
  49
  50 #define assert(cnd) ((void)0)
  51
  52 #else
  53
  54 #if defined(_MSC_VER)
  55 #ifdef _KERNEL_MODE
  56 /* Windows kernel mode compilation */
  57 #include <wdm.h>
  58 #define assert(cnd) ASSERT(cnd)
  59 #else
  60 /* Windows usermode compilation */
  61 #include <assert.h>
  62 #endif
  63
  64 #elif defined(__KERNEL__)
  65 #include <linux/bug.h>
  66
  67 /* TODO: it would be cleaner to use this:
  68  * #define assert(cnd) BUG_ON(cnd)
  69  * but that causes many compiler warnings (==errors) under Android
  70  * because it seems that the BUG_ON() macro is not seen as a check by
  71  * gcc like the BUG() macro is. */
  72 #define assert(cnd) \
  73         do { \
  74                 if (!(cnd)) \
  75                         BUG(); \
  76         } while (0)
  77
  78 #elif defined(__FIST__) || defined(__GNUC__)
  79
  80 /* enable assert for crun */
  81 #include "assert.h"
  82
  83 #else /* default for unknown environments */
  84 #define assert(cnd) ((void)0)
  85 #endif
  86
  87 #endif /* NDEBUG */
  88
  89 #ifndef PIPE_GENERATION
  90 /* Deprecated OP___assert, this is still used in ~1000 places
  91  * in the code. This will be removed over time.
  92  * The implemenation for the pipe generation tool is in see support.isp.h */
  93 #define OP___assert(cnd) assert(cnd)
  94
  95 STORAGE_CLASS_INLINE void compile_time_assert (unsigned cond)
  96 {
  97         /* Call undefined function if cond is false */
  98         extern void _compile_time_assert (void);
  99         if (!cond) _compile_time_assert();
 100 }
 101 #endif /* PIPE_GENERATION */
 102
 103 #endif /* __ASSERT_SUPPORT_H_INCLUDED__ */