1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Support for Intel Camera Imaging ISP subsystem. 4 * Copyright (c) 2015, Intel Corporation. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms and conditions of the GNU General Public License, 8 * version 2, as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 * more details. 14 */ 15 16 #ifndef __ASSERT_SUPPORT_H_INCLUDED__ 17 #define __ASSERT_SUPPORT_H_INCLUDED__ 18 19 /** 20 * The following macro can help to test the size of a struct at compile 21 * time rather than at run-time. It does not work for all compilers; see 22 * below. 23 * 24 * Depending on the value of 'condition', the following macro is expanded to: 25 * - condition==true: 26 * an expression containing an array declaration with negative size, 27 * usually resulting in a compilation error 28 * - condition==false: 29 * (void) 1; // C statement with no effect 30 * 31 * example: 32 * COMPILATION_ERROR_IF( sizeof(struct host_sp_queues) != SIZE_OF_HOST_SP_QUEUES_STRUCT); 33 * 34 * verify that the macro indeed triggers a compilation error with your compiler: 35 * COMPILATION_ERROR_IF( sizeof(struct host_sp_queues) != (sizeof(struct host_sp_queues)+1) ); 36 * 37 * Not all compilers will trigger an error with this macro; use a search engine to search for 38 * BUILD_BUG_ON to find other methods. 39 */ 40 #define COMPILATION_ERROR_IF(condition) ((void)sizeof(char[1 - 2 * !!(condition)])) 41 42 /* Compile time assertion */ 43 #ifndef CT_ASSERT 44 #define CT_ASSERT(cnd) ((void)sizeof(char[(cnd) ? 1 : -1])) 45 #endif /* CT_ASSERT */ 46 47 #include <linux/bug.h> 48 49 /* TODO: it would be cleaner to use this: 50 * #define assert(cnd) BUG_ON(cnd) 51 * but that causes many compiler warnings (==errors) under Android 52 * because it seems that the BUG_ON() macro is not seen as a check by 53 * gcc like the BUG() macro is. */ 54 #define assert(cnd) \ 55 do { \ 56 if (!(cnd)) \ 57 BUG(); \ 58 } while (0) 59 60 #ifndef PIPE_GENERATION 61 /* Deprecated OP___assert, this is still used in ~1000 places 62 * in the code. This will be removed over time. 63 * The implementation for the pipe generation tool is in see support.isp.h */ 64 #define OP___assert(cnd) assert(cnd) 65 66 static inline void compile_time_assert(unsigned int cond) 67 { 68 /* Call undefined function if cond is false */ 69 void _compile_time_assert(void); 70 if (!cond) _compile_time_assert(); 71 } 72 #endif /* PIPE_GENERATION */ 73 74 #endif /* __ASSERT_SUPPORT_H_INCLUDED__ */ 75