1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (c) 2024, Intel Corporation 3 #include <stdbool.h> 4 #include <stdio.h> 5 6 #define MAX_PACKED_FIELD_SIZE 50 7 8 int main(int argc, char **argv) 9 { 10 /* The first macro doesn't need a 'do {} while(0)' loop */ 11 printf("#define CHECK_PACKED_FIELDS_1(fields) \\\n"); 12 printf("\tCHECK_PACKED_FIELD(fields, 0)\n\n"); 13 14 /* Remaining macros require a do/while loop, and are implemented 15 * recursively by calling the previous iteration's macro. 16 */ 17 for (int i = 2; i <= MAX_PACKED_FIELD_SIZE; i++) { 18 printf("#define CHECK_PACKED_FIELDS_%d(fields) do { \\\n", i); 19 printf("\tCHECK_PACKED_FIELDS_%d(fields); \\\n", i - 1); 20 printf("\tCHECK_PACKED_FIELD(fields, %d); \\\n", i - 1); 21 printf("} while (0)\n\n"); 22 } 23 24 printf("#define CHECK_PACKED_FIELDS(fields) \\\n"); 25 26 for (int i = 1; i <= MAX_PACKED_FIELD_SIZE; i++) 27 printf("\t__builtin_choose_expr(ARRAY_SIZE(fields) == %d, ({ CHECK_PACKED_FIELDS_%d(fields); }), \\\n", 28 i, i); 29 30 printf("\t({ BUILD_BUG_ON_MSG(1, \"CHECK_PACKED_FIELDS() must be regenerated to support array sizes larger than %d.\"); }) \\\n", 31 MAX_PACKED_FIELD_SIZE); 32 33 for (int i = 1; i <= MAX_PACKED_FIELD_SIZE; i++) 34 printf(")"); 35 36 printf("\n"); 37 } 38