1 /* Common hooks for ATMEL AVR. 2 Copyright (C) 1998-2018 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 6 GCC is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3, or (at your option) 9 any later version. 10 11 GCC is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GCC; see the file COPYING3. If not see 18 <http://www.gnu.org/licenses/>. */ 19 20 #include "config.h" 21 #include "system.h" 22 #include "coretypes.h" 23 #include "tm.h" 24 #include "common/common-target.h" 25 #include "common/common-target-def.h" 26 27 /* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */ 28 static const struct default_options avr_option_optimization_table[] = 29 { 30 // With -fdelete-null-pointer-checks option, the compiler assumes 31 // that dereferencing of a null pointer would halt the program. 32 // For AVR this assumption is not true and a program can safely 33 // dereference null pointers. Changes made by this option may not 34 // work properly for AVR. So disable this option. 35 { OPT_LEVELS_ALL, OPT_fdelete_null_pointer_checks, NULL, 0 }, 36 // The only effect of -fcaller-saves might be that it triggers 37 // a frame without need when it tries to be smart around calls. 38 { OPT_LEVELS_ALL, OPT_fcaller_saves, NULL, 0 }, 39 { OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_mgas_isr_prologues, NULL, 1 }, 40 { OPT_LEVELS_1_PLUS, OPT_mmain_is_OS_task, NULL, 1 }, 41 { OPT_LEVELS_NONE, 0, NULL, 0 } 42 }; 43 44 #undef TARGET_OPTION_OPTIMIZATION_TABLE 45 #define TARGET_OPTION_OPTIMIZATION_TABLE avr_option_optimization_table 46 47 #undef TARGET_EXCEPT_UNWIND_INFO 48 #define TARGET_EXCEPT_UNWIND_INFO sjlj_except_unwind_info 49 50 struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER; 51