xfa.h
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1 /*
2  * Copyright (C) 2016 Kaspar Schleiser <kaspar@schleiser.de>
3  *
4  * This file is subject to the terms and conditions of the GNU Lesser
5  * General Public License v2.1. See the file LICENSE in the top level
6  * directory for more details.
7  */
8 
25 #ifndef XFA_H
26 #define XFA_H
27 
28 #include <inttypes.h>
29 #include "compiler_hints.h"
30 
31 /*
32  * Unfortunately, current gcc trips over accessing XFA's because of their
33  * zero-size start/end array that are used of symbol markers, with an "array
34  * index out of bounds" warning. So until a solution for that is found, we
35  * need to disable array bounds checks for files using XFAs.
36  */
37 #ifndef DOXYGEN
38 _Pragma("GCC diagnostic ignored \"-Warray-bounds\"")
39 #endif
40 
46 #define _XFA(type, name, prio) \
47  NO_SANITIZE_ARRAY \
48  __attribute__((used, section(".xfa." #name "." #prio))) _Alignas(type) type
49 
55 #define _XFA_CONST(type, name, prio) \
56  NO_SANITIZE_ARRAY \
57  __attribute__((used, section(".roxfa." #name "." #prio))) _Alignas(type) type
58 
73 #define XFA_INIT_CONST(type, name) \
74  _Pragma("GCC diagnostic push") \
75  _Pragma("GCC diagnostic ignored \"-Wpedantic\"") \
76  _XFA_CONST(type, name, 0_) name [0] = {}; \
77  _XFA_CONST(type, name, 9_) name ## _end [0] = {}; \
78  _Pragma("GCC diagnostic pop") \
79  extern const unsigned __xfa_dummy
80 
95 #define XFA_INIT(type, name) \
96  _Pragma("GCC diagnostic push") \
97  _Pragma("GCC diagnostic ignored \"-Wpedantic\"") \
98  _XFA(type, name, 0_) name [0] = {}; \
99  _XFA(type, name, 9_) name ## _end [0] = {}; \
100  _Pragma("GCC diagnostic pop") \
101  extern const unsigned __xfa_dummy
102 
114 #define XFA_USE_CONST(type, name) \
115  XFA_USE(type, name)
116 
128 #define XFA_USE(type, name) \
129  extern type name []; \
130  extern type name ## _end []
131 
145 #define XFA(type, xfa_name, prio) _XFA(type, xfa_name, 5_ ## prio)
146 
160 #define XFA_CONST(type, xfa_name, prio) _XFA_CONST(type, xfa_name, 5_ ## prio)
161 
178 #define XFA_ADD_PTR(xfa_name, prio, name, entry) \
179  _XFA_CONST(__typeof__(entry), xfa_name, 5_ ## prio) \
180  xfa_name ## _ ## prio ## _ ## name = entry
181 
185 #define XFA_LEN(type, \
186  name) (((uintptr_t)name ## _end - (uintptr_t)name) / \
187  sizeof(type))
188 
189 #ifdef __cplusplus
190 extern "C" {
191 #endif
192 /* making externc happy */
193 #ifdef __cplusplus
194 }
195 #endif
196 
197 #endif /* XFA_H */
compiler_hints.h
Common macros and compiler attributes/pragmas configuration.
inttypes.h
Adds include for missing inttype definitions.