1 /* LTO IL options. 2 3 Copyright 2009, 2010, 2011, 2012 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 "tree.h" 26 #include "hashtab.h" 27 #include "ggc.h" 28 #include "vec.h" 29 #include "bitmap.h" 30 #include "flags.h" 31 #include "opts.h" 32 #include "options.h" 33 #include "common/common-target.h" 34 #include "diagnostic.h" 35 #include "lto-streamer.h" 36 #include "toplev.h" 37 38 /* Append the option piece OPT to the COLLECT_GCC_OPTIONS string 39 set up by OB, appropriately quoted and separated by spaces 40 (if !*FIRST_P). */ 41 42 static void 43 append_to_collect_gcc_options (struct obstack *ob, 44 bool *first_p, const char *opt) 45 { 46 const char *p, *q = opt; 47 if (!first_p) 48 obstack_grow (ob, " ", 1); 49 obstack_grow (ob, "'", 1); 50 while ((p = strchr (q, '\''))) 51 { 52 obstack_grow (ob, q, p - q); 53 obstack_grow (ob, "'\\''", 4); 54 q = ++p; 55 } 56 obstack_grow (ob, q, strlen (q)); 57 obstack_grow (ob, "'", 1); 58 *first_p = false; 59 } 60 61 /* Write currently held options to an LTO IL section. */ 62 63 void 64 lto_write_options (void) 65 { 66 struct lto_output_stream stream; 67 char *section_name; 68 struct obstack temporary_obstack; 69 unsigned int i, j; 70 char *args; 71 bool first_p = true; 72 73 section_name = lto_get_section_name (LTO_section_opts, NULL, NULL); 74 lto_begin_section (section_name, false); 75 memset (&stream, 0, sizeof (stream)); 76 77 obstack_init (&temporary_obstack); 78 79 /* Output options that affect GIMPLE IL semantics and are implicitely 80 enabled by the frontend. 81 This for now includes an explicit set of options that we also handle 82 explicitly in lto-wrapper.c. In the end the effects on GIMPLE IL 83 semantics should be explicitely encoded in the IL or saved per 84 function rather than per compilation unit. */ 85 /* -fexceptions causes the EH machinery to be initialized, enabling 86 generation of unwind data so that explicit throw() calls work. */ 87 if (global_options.x_flag_exceptions) 88 append_to_collect_gcc_options (&temporary_obstack, &first_p, 89 "-fexceptions"); 90 91 /* Output explicitely passed options. */ 92 for (i = 1; i < save_decoded_options_count; ++i) 93 { 94 struct cl_decoded_option *option = &save_decoded_options[i]; 95 96 /* Skip explicitly some common options that we do not need. */ 97 switch (option->opt_index) 98 { 99 case OPT_dumpbase: 100 case OPT_SPECIAL_unknown: 101 case OPT_SPECIAL_ignore: 102 case OPT_SPECIAL_program_name: 103 case OPT_SPECIAL_input_file: 104 continue; 105 106 default: 107 break; 108 } 109 110 /* Skip frontend and driver specific options here. */ 111 if (!(cl_options[option->opt_index].flags & (CL_COMMON|CL_TARGET|CL_LTO))) 112 continue; 113 114 /* Drop options created from the gcc driver that will be rejected 115 when passed on to the driver again. */ 116 if (cl_options[option->opt_index].cl_reject_driver) 117 continue; 118 119 /* Also drop all options that are handled by the driver as well, 120 which includes things like -o and -v or -fhelp for example. 121 We do not need those. Also drop all diagnostic options. */ 122 if (cl_options[option->opt_index].flags & (CL_DRIVER|CL_WARNING)) 123 continue; 124 125 for (j = 0; j < option->canonical_option_num_elements; ++j) 126 append_to_collect_gcc_options (&temporary_obstack, &first_p, 127 option->canonical_option[j]); 128 } 129 obstack_grow (&temporary_obstack, "\0", 1); 130 args = XOBFINISH (&temporary_obstack, char *); 131 lto_output_data_stream (&stream, args, strlen (args) + 1); 132 133 lto_write_stream (&stream); 134 lto_end_section (); 135 136 obstack_free (&temporary_obstack, NULL); 137 free (section_name); 138 } 139