1 /****************************************************************************** 2 * 3 * Name: acgcc.h - GCC specific defines, etc. 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2023, Intel Corp. 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions, and the following disclaimer, 16 * without modification. 17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 18 * substantially similar to the "NO WARRANTY" disclaimer below 19 * ("Disclaimer") and any redistribution must be conditioned upon 20 * including a substantially similar Disclaimer requirement for further 21 * binary redistribution. 22 * 3. Neither the names of the above-listed copyright holders nor the names 23 * of any contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * Alternatively, this software may be distributed under the terms of the 27 * GNU General Public License ("GPL") version 2 as published by the Free 28 * Software Foundation. 29 * 30 * NO WARRANTY 31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 41 * POSSIBILITY OF SUCH DAMAGES. 42 */ 43 44 #ifndef __ACGCC_H__ 45 #define __ACGCC_H__ 46 47 /* 48 * Use compiler specific <stdarg.h> is a good practice for even when 49 * -nostdinc is specified (i.e., ACPI_USE_STANDARD_HEADERS undefined. 50 */ 51 #ifndef va_arg 52 #ifdef ACPI_USE_BUILTIN_STDARG 53 typedef __builtin_va_list va_list; 54 #define va_start(v, l) __builtin_va_start(v, l) 55 #define va_end(v) __builtin_va_end(v) 56 #define va_arg(v, l) __builtin_va_arg(v, l) 57 #define va_copy(d, s) __builtin_va_copy(d, s) 58 #else 59 #if defined(_KERNEL) || defined(_STANDALONE) 60 #include <sys/stdarg.h> 61 #else 62 #include <stdarg.h> 63 #endif 64 #endif 65 #endif 66 67 #define ACPI_INLINE __inline__ 68 69 /* Function name is used for debug output. Non-ANSI, compiler-dependent */ 70 71 #define ACPI_GET_FUNCTION_NAME __func__ 72 73 /* 74 * This macro is used to tag functions as "printf-like" because 75 * some compilers (like GCC) can catch printf format string problems. 76 */ 77 #define ACPI_PRINTF_LIKE(c) __attribute__ ((__format__ (__printf__, c, c+1))) 78 79 /* 80 * Some compilers complain about unused variables. Sometimes we don't want to 81 * use all the variables (for example, _AcpiModuleName). This allows us 82 * to tell the compiler warning in a per-variable manner that a variable 83 * is unused. 84 */ 85 #define ACPI_UNUSED_VAR __attribute__ ((unused)) 86 87 /* GCC supports __VA_ARGS__ in macros */ 88 89 #define COMPILER_VA_MACRO 1 90 91 /* GCC supports native multiply/shift on 32-bit platforms */ 92 93 #define ACPI_USE_NATIVE_MATH64 94 95 /* GCC did not support __has_attribute until 5.1. */ 96 97 #ifndef __has_attribute 98 #define __has_attribute(x) 0 99 #endif 100 101 /* 102 * Explicitly mark intentional explicit fallthrough to silence 103 * -Wimplicit-fallthrough in GCC 7.1+. 104 */ 105 106 #if __has_attribute(__fallthrough__) 107 #define ACPI_FALLTHROUGH __attribute__((__fallthrough__)) 108 #endif 109 110 /* 111 * Flexible array members are not allowed to be part of a union under 112 * C99, but this is not for any technical reason. Work around the 113 * limitation. 114 */ 115 #ifndef __cplusplus 116 #define ACPI_FLEX_ARRAY(TYPE, NAME) \ 117 struct { \ 118 struct { } __Empty_ ## NAME; \ 119 TYPE NAME[]; \ 120 } 121 #endif 122 123 #endif /* __ACGCC_H__ */ 124