| /* |
| * |
| * Copyright 2017 Google Inc. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; version 2 of the License. |
| * |
| * 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 __COMPILER_H__ |
| #define __COMPILER_H__ |
| |
| #if defined(__WIN32) || defined(__WIN64) |
| #define __packed __attribute__((gcc_struct, packed)) |
| #else |
| #define __packed __attribute__((packed)) |
| #endif |
| |
| #define __aligned(x) __attribute__((aligned(x))) |
| #define __always_unused __attribute__((unused)) |
| #define __must_check __attribute__((warn_unused_result)) |
| |
| /* This evaluates to the type of the first expression, unless that is constant |
| in which case it evalutates to the type of the second. This is useful when |
| assigning macro parameters to temporary variables, because that would |
| normally circumvent the special loosened type promotion rules for integer |
| literals. By using this macro, the promotion can happen at the time the |
| literal is assigned to the temporary variable. If the literal doesn't fit in |
| the chosen type, -Werror=overflow will catch it, so this should be safe. */ |
| #define __TYPEOF_UNLESS_CONST(expr, fallback_expr) typeof( \ |
| __builtin_choose_expr(__builtin_constant_p(expr), fallback_expr, expr)) |
| |
| /* This creates a unique local variable name for use in macros. */ |
| #define __TMPNAME_3(i) __tmpname_##i |
| #define __TMPNAME_2(i) __TMPNAME_3(i) |
| #define __TMPNAME __TMPNAME_2(__COUNTER__) |
| |
| #endif |