1 /* LTO IL options. 2 3 Copyright (C) 2009-2020 Free Software Foundation, Inc. 4 Contributed by Simon Baldwin <simonb@google.com> 5 6 This file is part of GCC. 7 8 GCC is free software; you can redistribute it and/or modify it under 9 the terms of the GNU General Public License as published by the Free 10 Software Foundation; either version 3, or (at your option) any later 11 version. 12 13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 14 WARRANTY; without even the implied warranty of MERCHANTABILITY or 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 16 for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with GCC; see the file COPYING3. If not see 20 <http://www.gnu.org/licenses/>. */ 21 22 #include "config.h" 23 #include "system.h" 24 #include "coretypes.h" 25 #include "backend.h" 26 #include "target.h" 27 #include "tree.h" 28 #include "gimple.h" 29 #include "cgraph.h" 30 #include "lto-streamer.h" 31 #include "opts.h" 32 #include "toplev.h" 33 34 /* Append the option piece OPT to the COLLECT_GCC_OPTIONS string 35 set up by OB, appropriately quoted and separated by spaces 36 (if !*FIRST_P). */ 37 38 static void 39 append_to_collect_gcc_options (struct obstack *ob, 40 bool *first_p, const char *opt) 41 { 42 const char *p, *q = opt; 43 if (!*first_p) 44 obstack_grow (ob, " ", 1); 45 obstack_grow (ob, "'", 1); 46 while ((p = strchr (q, '\''))) 47 { 48 obstack_grow (ob, q, p - q); 49 obstack_grow (ob, "'\\''", 4); 50 q = ++p; 51 } 52 obstack_grow (ob, q, strlen (q)); 53 obstack_grow (ob, "'", 1); 54 *first_p = false; 55 } 56 57 /* Write currently held options to an LTO IL section. */ 58 59 void 60 lto_write_options (void) 61 { 62 char *section_name; 63 struct obstack temporary_obstack; 64 unsigned int i, j; 65 char *args; 66 bool first_p = true; 67 68 section_name = lto_get_section_name (LTO_section_opts, NULL, 0, NULL); 69 lto_begin_section (section_name, false); 70 71 obstack_init (&temporary_obstack); 72 73 if (!global_options_set.x_flag_openmp 74 && !global_options.x_flag_openmp) 75 append_to_collect_gcc_options (&temporary_obstack, &first_p, 76 "-fno-openmp"); 77 if (!global_options_set.x_flag_openacc 78 && !global_options.x_flag_openacc) 79 append_to_collect_gcc_options (&temporary_obstack, &first_p, 80 "-fno-openacc"); 81 /* Append PIC/PIE mode because its default depends on target and it is 82 subject of merging in lto-wrapper. */ 83 if (!global_options_set.x_flag_pic && !global_options_set.x_flag_pie) 84 { 85 append_to_collect_gcc_options (&temporary_obstack, &first_p, 86 global_options.x_flag_pic == 2 87 ? "-fPIC" 88 : global_options.x_flag_pic == 1 89 ? "-fpic" 90 : global_options.x_flag_pie == 2 91 ? "-fPIE" 92 : global_options.x_flag_pie == 1 93 ? "-fpie" 94 : "-fno-pie"); 95 } 96 97 if (!global_options_set.x_flag_cf_protection) 98 { 99 append_to_collect_gcc_options ( 100 &temporary_obstack, &first_p, 101 global_options.x_flag_cf_protection == CF_NONE 102 ? "-fcf-protection=none" 103 : global_options.x_flag_cf_protection == CF_FULL 104 ? "-fcf-protection=full" 105 : global_options.x_flag_cf_protection == CF_BRANCH 106 ? "-fcf-protection=branch" 107 : global_options.x_flag_cf_protection == CF_RETURN 108 ? "-fcf-protection=return" 109 : ""); 110 } 111 112 /* If debug info is enabled append -g. */ 113 if (debug_info_level > DINFO_LEVEL_NONE) 114 append_to_collect_gcc_options (&temporary_obstack, &first_p, "-g"); 115 116 /* Append options from target hook and store them to offload_lto section. */ 117 if (lto_stream_offload_p) 118 { 119 char *offload_opts = targetm.offload_options (); 120 char *offload_ptr = offload_opts; 121 while (offload_ptr) 122 { 123 char *next = strchr (offload_ptr, ' '); 124 if (next) 125 *next++ = '\0'; 126 append_to_collect_gcc_options (&temporary_obstack, &first_p, 127 offload_ptr); 128 offload_ptr = next; 129 } 130 free (offload_opts); 131 } 132 133 /* Output explicitly passed options. */ 134 for (i = 1; i < save_decoded_options_count; ++i) 135 { 136 struct cl_decoded_option *option = &save_decoded_options[i]; 137 138 /* Skip explicitly some common options that we do not need. */ 139 switch (option->opt_index) 140 { 141 case OPT_dumpbase: 142 case OPT_SPECIAL_unknown: 143 case OPT_SPECIAL_ignore: 144 case OPT_SPECIAL_warn_removed: 145 case OPT_SPECIAL_program_name: 146 case OPT_SPECIAL_input_file: 147 case OPT_dumpdir: 148 case OPT_fresolution_: 149 case OPT_fdebug_prefix_map_: 150 case OPT_ffile_prefix_map_: 151 case OPT_fmacro_prefix_map_: 152 continue; 153 154 default: 155 break; 156 } 157 158 /* Skip frontend and driver specific options here. */ 159 if (!(cl_options[option->opt_index].flags & (CL_COMMON|CL_TARGET|CL_LTO))) 160 continue; 161 162 /* Do not store target-specific options in offload_lto section. */ 163 if ((cl_options[option->opt_index].flags & CL_TARGET) 164 && lto_stream_offload_p) 165 continue; 166 167 /* Drop options created from the gcc driver that will be rejected 168 when passed on to the driver again. */ 169 if (cl_options[option->opt_index].cl_reject_driver) 170 continue; 171 172 /* Also drop all options that are handled by the driver as well, 173 which includes things like -o and -v or -fhelp for example. 174 We do not need those. The only exception is -foffload option, if we 175 write it in offload_lto section. Also drop all diagnostic options. */ 176 if ((cl_options[option->opt_index].flags & (CL_DRIVER|CL_WARNING)) 177 && (!lto_stream_offload_p || option->opt_index != OPT_foffload_)) 178 continue; 179 180 for (j = 0; j < option->canonical_option_num_elements; ++j) 181 append_to_collect_gcc_options (&temporary_obstack, &first_p, 182 option->canonical_option[j]); 183 } 184 185 const char *collect_as_options = getenv ("COLLECT_AS_OPTIONS"); 186 if (collect_as_options) 187 prepend_xassembler_to_collect_as_options (collect_as_options, 188 &temporary_obstack); 189 190 obstack_grow (&temporary_obstack, "\0", 1); 191 args = XOBFINISH (&temporary_obstack, char *); 192 lto_write_data (args, strlen (args) + 1); 193 lto_end_section (); 194 195 obstack_free (&temporary_obstack, NULL); 196 free (section_name); 197 } 198