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 frontend and driver specific options here. */ 97 if (!(cl_options[option->opt_index].flags & (CL_COMMON|CL_TARGET|CL_LTO))) 98 continue; 99 100 /* Drop options created from the gcc driver that will be rejected 101 when passed on to the driver again. */ 102 if (cl_options[option->opt_index].cl_reject_driver) 103 continue; 104 105 /* Also drop all options that are handled by the driver as well, 106 which includes things like -o and -v or -fhelp for example. 107 We do not need those. Also drop all diagnostic options. */ 108 if (cl_options[option->opt_index].flags & (CL_DRIVER|CL_WARNING)) 109 continue; 110 111 /* Skip explicitly some common options that we do not need. */ 112 switch (option->opt_index) 113 { 114 case OPT_dumpbase: 115 case OPT_SPECIAL_input_file: 116 continue; 117 118 default: 119 break; 120 } 121 122 for (j = 0; j < option->canonical_option_num_elements; ++j) 123 append_to_collect_gcc_options (&temporary_obstack, &first_p, 124 option->canonical_option[j]); 125 } 126 obstack_grow (&temporary_obstack, "\0", 1); 127 args = XOBFINISH (&temporary_obstack, char *); 128 lto_output_data_stream (&stream, args, strlen (args) + 1); 129 130 lto_write_stream (&stream); 131 lto_end_section (); 132 133 obstack_free (&temporary_obstack, NULL); 134 free (section_name); 135 } 136