1/* Command line option handling. 2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 3 Free Software Foundation, Inc. 4 Contributed by Neil Booth. 5 6This file is part of GCC. 7 8GCC is free software; you can redistribute it and/or modify it under 9the terms of the GNU General Public License as published by the Free 10Software Foundation; either version 2, or (at your option) any later 11version. 12 13GCC is distributed in the hope that it will be useful, but WITHOUT ANY 14WARRANTY; without even the implied warranty of MERCHANTABILITY or 15FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 16for more details. 17 18You should have received a copy of the GNU General Public License 19along with GCC; see the file COPYING. If not, write to the Free 20Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 2102110-1301, USA. */ 22 23/* $FreeBSD$ */ 24 25#include "config.h" 26#include "system.h" 27#include "intl.h" 28#include "coretypes.h" 29#include "tm.h" 30#include "tree.h" 31#include "rtl.h" 32#include "ggc.h" 33#include "output.h" 34#include "langhooks.h" 35#include "opts.h" 36#include "options.h" 37#include "flags.h" 38#include "toplev.h" 39#include "params.h" 40#include "diagnostic.h" 41#include "tm_p.h" /* For OPTIMIZATION_OPTIONS. */ 42#include "insn-attr.h" /* For INSN_SCHEDULING. */ 43#include "target.h" 44#include "tree-pass.h" 45 46/* Value of the -G xx switch, and whether it was passed or not. */ 47unsigned HOST_WIDE_INT g_switch_value; 48bool g_switch_set; 49 50/* True if we should exit after parsing options. */ 51bool exit_after_options; 52 53/* Print various extra warnings. -W/-Wextra. */ 54bool extra_warnings; 55 56/* True to warn about any objects definitions whose size is larger 57 than N bytes. Also want about function definitions whose returned 58 values are larger than N bytes, where N is `larger_than_size'. */ 59bool warn_larger_than; 60HOST_WIDE_INT larger_than_size; 61 62/* True to warn about any function whose frame size is larger 63 * than N bytes. */ 64bool warn_frame_larger_than; 65HOST_WIDE_INT frame_larger_than_size; 66 67/* Nonzero means warn about constructs which might not be 68 strict-aliasing safe. */ 69int warn_strict_aliasing; 70 71/* Nonzero means warn about optimizations which rely on undefined 72 signed overflow. */ 73int warn_strict_overflow; 74 75/* Hack for cooperation between set_Wunused and set_Wextra. */ 76static bool maybe_warn_unused_parameter; 77 78/* Type(s) of debugging information we are producing (if any). See 79 flags.h for the definitions of the different possible types of 80 debugging information. */ 81enum debug_info_type write_symbols = NO_DEBUG; 82 83/* Level of debugging information we are producing. See flags.h for 84 the definitions of the different possible levels. */ 85enum debug_info_level debug_info_level = DINFO_LEVEL_NONE; 86 87/* A major contribution to object and executable size is debug 88 information size. A major contribution to debug information size 89 is struct descriptions replicated in several object files. The 90 following flags attempt to reduce this information. The basic 91 idea is to not emit struct debugging information in the current 92 compilation unit when that information will be generated by 93 another compilation unit. 94 95 Debug information for a struct defined in the current source 96 file should be generated in the object file. Likewise the 97 debug information for a struct defined in a header should be 98 generated in the object file of the corresponding source file. 99 Both of these case are handled when the base name of the file of 100 the struct definition matches the base name of the source file 101 of thet current compilation unit. This matching emits minimal 102 struct debugging information. 103 104 The base file name matching rule above will fail to emit debug 105 information for structs defined in system headers. So a second 106 category of files includes system headers in addition to files 107 with matching bases. 108 109 The remaining types of files are library headers and application 110 headers. We cannot currently distinguish these two types. */ 111 112enum debug_struct_file 113{ 114 DINFO_STRUCT_FILE_NONE, /* Debug no structs. */ 115 DINFO_STRUCT_FILE_BASE, /* Debug structs defined in files with the 116 same base name as the compilation unit. */ 117 DINFO_STRUCT_FILE_SYS, /* Also debug structs defined in system 118 header files. */ 119 DINFO_STRUCT_FILE_ANY /* Debug structs defined in all files. */ 120}; 121 122/* Generic structs (e.g. templates not explicitly specialized) 123 may not have a compilation unit associated with them, and so 124 may need to be treated differently from ordinary structs. 125 126 Structs only handled by reference (indirectly), will also usually 127 not need as much debugging information. */ 128 129static enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS] 130 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }; 131static enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS] 132 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }; 133 134/* Parse the -femit-struct-debug-detailed option value 135 and set the flag variables. */ 136 137#define MATCH( prefix, string ) \ 138 ((strncmp (prefix, string, sizeof prefix - 1) == 0) \ 139 ? ((string += sizeof prefix - 1), 1) : 0) 140 141void 142set_struct_debug_option (const char *spec) 143{ 144 /* various labels for comparison */ 145 static char dfn_lbl[] = "dfn:", dir_lbl[] = "dir:", ind_lbl[] = "ind:"; 146 static char ord_lbl[] = "ord:", gen_lbl[] = "gen:"; 147 static char none_lbl[] = "none", any_lbl[] = "any"; 148 static char base_lbl[] = "base", sys_lbl[] = "sys"; 149 150 enum debug_struct_file files = DINFO_STRUCT_FILE_ANY; 151 /* Default is to apply to as much as possible. */ 152 enum debug_info_usage usage = DINFO_USAGE_NUM_ENUMS; 153 int ord = 1, gen = 1; 154 155 /* What usage? */ 156 if (MATCH (dfn_lbl, spec)) 157 usage = DINFO_USAGE_DFN; 158 else if (MATCH (dir_lbl, spec)) 159 usage = DINFO_USAGE_DIR_USE; 160 else if (MATCH (ind_lbl, spec)) 161 usage = DINFO_USAGE_IND_USE; 162 163 /* Generics or not? */ 164 if (MATCH (ord_lbl, spec)) 165 gen = 0; 166 else if (MATCH (gen_lbl, spec)) 167 ord = 0; 168 169 /* What allowable environment? */ 170 if (MATCH (none_lbl, spec)) 171 files = DINFO_STRUCT_FILE_NONE; 172 else if (MATCH (any_lbl, spec)) 173 files = DINFO_STRUCT_FILE_ANY; 174 else if (MATCH (sys_lbl, spec)) 175 files = DINFO_STRUCT_FILE_SYS; 176 else if (MATCH (base_lbl, spec)) 177 files = DINFO_STRUCT_FILE_BASE; 178 else 179 error ("argument %qs to %<-femit-struct-debug-detailed%> not recognized", 180 spec); 181 182 /* Effect the specification. */ 183 if (usage == DINFO_USAGE_NUM_ENUMS) 184 { 185 if (ord) 186 { 187 debug_struct_ordinary[DINFO_USAGE_DFN] = files; 188 debug_struct_ordinary[DINFO_USAGE_DIR_USE] = files; 189 debug_struct_ordinary[DINFO_USAGE_IND_USE] = files; 190 } 191 if (gen) 192 { 193 debug_struct_generic[DINFO_USAGE_DFN] = files; 194 debug_struct_generic[DINFO_USAGE_DIR_USE] = files; 195 debug_struct_generic[DINFO_USAGE_IND_USE] = files; 196 } 197 } 198 else 199 { 200 if (ord) 201 debug_struct_ordinary[usage] = files; 202 if (gen) 203 debug_struct_generic[usage] = files; 204 } 205 206 if (*spec == ',') 207 set_struct_debug_option (spec+1); 208 else 209 { 210 /* No more -femit-struct-debug-detailed specifications. 211 Do final checks. */ 212 if (*spec != '\0') 213 error ("argument %qs to %<-femit-struct-debug-detailed%> unknown", 214 spec); 215 if (debug_struct_ordinary[DINFO_USAGE_DIR_USE] 216 < debug_struct_ordinary[DINFO_USAGE_IND_USE] 217 || debug_struct_generic[DINFO_USAGE_DIR_USE] 218 < debug_struct_generic[DINFO_USAGE_IND_USE]) 219 error ("%<-femit-struct-debug-detailed=dir:...%> must allow at least" 220 " as much as %<-femit-struct-debug-detailed=ind:...%>"); 221 } 222} 223 224/* Find the base name of a path, stripping off both directories and 225 a single final extension. */ 226static int 227base_of_path (const char *path, const char **base_out) 228{ 229 const char *base = path; 230 const char *dot = 0; 231 const char *p = path; 232 char c = *p; 233 while (c) 234 { 235 if (IS_DIR_SEPARATOR(c)) 236 { 237 base = p + 1; 238 dot = 0; 239 } 240 else if (c == '.') 241 dot = p; 242 c = *++p; 243 } 244 if (!dot) 245 dot = p; 246 *base_out = base; 247 return dot - base; 248} 249 250/* Match the base name of a file to the base name of a compilation unit. */ 251 252static const char *main_input_basename; 253static int main_input_baselength; 254 255static int 256matches_main_base (const char *path) 257{ 258 /* Cache the last query. */ 259 static const char *last_path = NULL; 260 static int last_match = 0; 261 if (path != last_path) 262 { 263 const char *base; 264 int length = base_of_path (path, &base); 265 last_path = path; 266 last_match = (length == main_input_baselength 267 && memcmp (base, main_input_basename, length) == 0); 268 } 269 return last_match; 270} 271 272#ifdef DEBUG_DEBUG_STRUCT 273 274static int 275dump_struct_debug (tree type, enum debug_info_usage usage, 276 enum debug_struct_file criterion, int generic, 277 int matches, int result) 278{ 279 /* Find the type name. */ 280 tree type_decl = TYPE_STUB_DECL (type); 281 tree t = type_decl; 282 const char *name = 0; 283 if (TREE_CODE (t) == TYPE_DECL) 284 t = DECL_NAME (t); 285 if (t) 286 name = IDENTIFIER_POINTER (t); 287 288 fprintf (stderr, " struct %d %s %s %s %s %d %p %s\n", 289 criterion, 290 DECL_IN_SYSTEM_HEADER (type_decl) ? "sys" : "usr", 291 matches ? "bas" : "hdr", 292 generic ? "gen" : "ord", 293 usage == DINFO_USAGE_DFN ? ";" : 294 usage == DINFO_USAGE_DIR_USE ? "." : "*", 295 result, 296 (void*) type_decl, name); 297 return result; 298} 299#define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \ 300 dump_struct_debug (type, usage, criterion, generic, matches, result) 301 302#else 303 304#define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \ 305 (result) 306 307#endif 308 309 310bool 311should_emit_struct_debug (tree type, enum debug_info_usage usage) 312{ 313 enum debug_struct_file criterion; 314 tree type_decl; 315 bool generic = lang_hooks.types.generic_p (type); 316 317 if (generic) 318 criterion = debug_struct_generic[usage]; 319 else 320 criterion = debug_struct_ordinary[usage]; 321 322 if (criterion == DINFO_STRUCT_FILE_NONE) 323 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false); 324 if (criterion == DINFO_STRUCT_FILE_ANY) 325 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true); 326 327 type_decl = TYPE_STUB_DECL (type); 328 329 if (criterion == DINFO_STRUCT_FILE_SYS && DECL_IN_SYSTEM_HEADER (type_decl)) 330 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true); 331 332 if (matches_main_base (DECL_SOURCE_FILE (type_decl))) 333 return DUMP_GSTRUCT (type, usage, criterion, generic, true, true); 334 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false); 335} 336 337/* Nonzero means use GNU-only extensions in the generated symbolic 338 debugging information. Currently, this only has an effect when 339 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */ 340bool use_gnu_debug_info_extensions; 341 342/* The default visibility for all symbols (unless overridden) */ 343enum symbol_visibility default_visibility = VISIBILITY_DEFAULT; 344 345/* Disable unit-at-a-time for frontends that might be still broken in this 346 respect. */ 347 348bool no_unit_at_a_time_default; 349 350/* Global visibility options. */ 351struct visibility_flags visibility_options; 352 353/* Columns of --help display. */ 354static unsigned int columns = 80; 355 356/* What to print when a switch has no documentation. */ 357static const char undocumented_msg[] = N_("This switch lacks documentation"); 358 359/* Used for bookkeeping on whether user set these flags so 360 -fprofile-use/-fprofile-generate does not use them. */ 361static bool profile_arc_flag_set, flag_profile_values_set; 362static bool flag_unroll_loops_set, flag_tracer_set; 363static bool flag_value_profile_transformations_set; 364static bool flag_peel_loops_set, flag_branch_probabilities_set; 365 366/* Functions excluded from profiling. */ 367 368typedef char *char_p; /* For DEF_VEC_P. */ 369DEF_VEC_P(char_p); 370DEF_VEC_ALLOC_P(char_p,heap); 371 372static VEC(char_p,heap) *flag_instrument_functions_exclude_functions; 373static VEC(char_p,heap) *flag_instrument_functions_exclude_files; 374 375/* Input file names. */ 376const char **in_fnames; 377unsigned num_in_fnames; 378 379static int common_handle_option (size_t scode, const char *arg, int value, 380 unsigned int lang_mask); 381static void handle_param (const char *); 382static void set_Wextra (int); 383static unsigned int handle_option (const char **argv, unsigned int lang_mask); 384static char *write_langs (unsigned int lang_mask); 385static void complain_wrong_lang (const char *, const struct cl_option *, 386 unsigned int lang_mask); 387static void handle_options (unsigned int, const char **, unsigned int); 388static void wrap_help (const char *help, const char *item, unsigned int); 389static void print_target_help (void); 390static void print_help (void); 391static void print_param_help (void); 392static void print_filtered_help (unsigned int); 393static unsigned int print_switch (const char *text, unsigned int indent); 394static void set_debug_level (enum debug_info_type type, int extended, 395 const char *arg); 396 397/* If ARG is a non-negative integer made up solely of digits, return its 398 value, otherwise return -1. */ 399static int 400integral_argument (const char *arg) 401{ 402 const char *p = arg; 403 404 while (*p && ISDIGIT (*p)) 405 p++; 406 407 if (*p == '\0') 408 return atoi (arg); 409 410 return -1; 411} 412 413/* Return a malloced slash-separated list of languages in MASK. */ 414static char * 415write_langs (unsigned int mask) 416{ 417 unsigned int n = 0, len = 0; 418 const char *lang_name; 419 char *result; 420 421 for (n = 0; (lang_name = lang_names[n]) != 0; n++) 422 if (mask & (1U << n)) 423 len += strlen (lang_name) + 1; 424 425 result = XNEWVEC (char, len); 426 len = 0; 427 for (n = 0; (lang_name = lang_names[n]) != 0; n++) 428 if (mask & (1U << n)) 429 { 430 if (len) 431 result[len++] = '/'; 432 strcpy (result + len, lang_name); 433 len += strlen (lang_name); 434 } 435 436 result[len] = 0; 437 438 return result; 439} 440 441/* Complain that switch OPT_INDEX does not apply to this front end. */ 442static void 443complain_wrong_lang (const char *text, const struct cl_option *option, 444 unsigned int lang_mask) 445{ 446 char *ok_langs, *bad_lang; 447 448 ok_langs = write_langs (option->flags); 449 bad_lang = write_langs (lang_mask); 450 451 /* Eventually this should become a hard error IMO. */ 452 warning (0, "command line option \"%s\" is valid for %s but not for %s", 453 text, ok_langs, bad_lang); 454 455 free (ok_langs); 456 free (bad_lang); 457} 458 459/* Handle the switch beginning at ARGV for the language indicated by 460 LANG_MASK. Returns the number of switches consumed. */ 461static unsigned int 462handle_option (const char **argv, unsigned int lang_mask) 463{ 464 size_t opt_index; 465 const char *opt, *arg = 0; 466 char *dup = 0; 467 int value = 1; 468 unsigned int result = 0; 469 const struct cl_option *option; 470 471 opt = argv[0]; 472 473 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET); 474 if (opt_index == cl_options_count 475 && (opt[1] == 'W' || opt[1] == 'f' || opt[1] == 'm') 476 && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-') 477 { 478 /* Drop the "no-" from negative switches. */ 479 size_t len = strlen (opt) - 3; 480 481 dup = XNEWVEC (char, len + 1); 482 dup[0] = '-'; 483 dup[1] = opt[1]; 484 memcpy (dup + 2, opt + 5, len - 2 + 1); 485 opt = dup; 486 value = 0; 487 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET); 488 } 489 490 if (opt_index == cl_options_count) 491 goto done; 492 493 option = &cl_options[opt_index]; 494 495 /* Reject negative form of switches that don't take negatives as 496 unrecognized. */ 497 if (!value && (option->flags & CL_REJECT_NEGATIVE)) 498 goto done; 499 500 /* We've recognized this switch. */ 501 result = 1; 502 503 /* Check to see if the option is disabled for this configuration. */ 504 if (option->flags & CL_DISABLED) 505 { 506 error ("command line option %qs" 507 " is not supported by this configuration", opt); 508 goto done; 509 } 510 511 /* Sort out any argument the switch takes. */ 512 if (option->flags & CL_JOINED) 513 { 514 /* Have arg point to the original switch. This is because 515 some code, such as disable_builtin_function, expects its 516 argument to be persistent until the program exits. */ 517 arg = argv[0] + cl_options[opt_index].opt_len + 1; 518 if (!value) 519 arg += strlen ("no-"); 520 521 if (*arg == '\0' && !(option->flags & CL_MISSING_OK)) 522 { 523 if (option->flags & CL_SEPARATE) 524 { 525 arg = argv[1]; 526 result = 2; 527 } 528 else 529 /* Missing argument. */ 530 arg = NULL; 531 } 532 } 533 else if (option->flags & CL_SEPARATE) 534 { 535 arg = argv[1]; 536 result = 2; 537 } 538 539 /* Now we've swallowed any potential argument, complain if this 540 is a switch for a different front end. */ 541 if (!(option->flags & (lang_mask | CL_COMMON | CL_TARGET))) 542 { 543 complain_wrong_lang (argv[0], option, lang_mask); 544 goto done; 545 } 546 547 if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE))) 548 { 549 if (!lang_hooks.missing_argument (opt, opt_index)) 550 error ("missing argument to \"%s\"", opt); 551 goto done; 552 } 553 554 /* If the switch takes an integer, convert it. */ 555 if (arg && (option->flags & CL_UINTEGER)) 556 { 557 value = integral_argument (arg); 558 if (value == -1) 559 { 560 error ("argument to \"%s\" should be a non-negative integer", 561 option->opt_text); 562 goto done; 563 } 564 } 565 566 if (option->flag_var) 567 switch (option->var_type) 568 { 569 case CLVC_BOOLEAN: 570 *(int *) option->flag_var = value; 571 break; 572 573 case CLVC_EQUAL: 574 *(int *) option->flag_var = (value 575 ? option->var_value 576 : !option->var_value); 577 break; 578 579 case CLVC_BIT_CLEAR: 580 case CLVC_BIT_SET: 581 if ((value != 0) == (option->var_type == CLVC_BIT_SET)) 582 *(int *) option->flag_var |= option->var_value; 583 else 584 *(int *) option->flag_var &= ~option->var_value; 585 if (option->flag_var == &target_flags) 586 target_flags_explicit |= option->var_value; 587 break; 588 589 case CLVC_STRING: 590 *(const char **) option->flag_var = arg; 591 break; 592 } 593 594 if (option->flags & lang_mask) 595 if (lang_hooks.handle_option (opt_index, arg, value) == 0) 596 result = 0; 597 598 if (result && (option->flags & CL_COMMON)) 599 if (common_handle_option (opt_index, arg, value, lang_mask) == 0) 600 result = 0; 601 602 if (result && (option->flags & CL_TARGET)) 603 if (!targetm.handle_option (opt_index, arg, value)) 604 result = 0; 605 606 done: 607 if (dup) 608 free (dup); 609 return result; 610} 611 612/* Handle FILENAME from the command line. */ 613static void 614add_input_filename (const char *filename) 615{ 616 num_in_fnames++; 617 in_fnames = xrealloc (in_fnames, num_in_fnames * sizeof (in_fnames[0])); 618 in_fnames[num_in_fnames - 1] = filename; 619} 620 621/* Add functions or file names to a vector of names to exclude from 622 instrumentation. */ 623 624static void 625add_instrument_functions_exclude_list (VEC(char_p,heap) **pvec, 626 const char* arg) 627{ 628 char *tmp; 629 char *r; 630 char *w; 631 char *token_start; 632 633 /* We never free this string. */ 634 tmp = xstrdup (arg); 635 636 r = tmp; 637 w = tmp; 638 token_start = tmp; 639 640 while (*r != '\0') 641 { 642 if (*r == ',') 643 { 644 *w++ = '\0'; 645 ++r; 646 VEC_safe_push (char_p, heap, *pvec, token_start); 647 token_start = w; 648 } 649 if (*r == '\\' && r[1] == ',') 650 { 651 *w++ = ','; 652 r += 2; 653 } 654 else 655 *w++ = *r++; 656 } 657 if (*token_start != '\0') 658 VEC_safe_push (char_p, heap, *pvec, token_start); 659} 660 661/* Return whether we should exclude FNDECL from instrumentation. */ 662 663bool 664flag_instrument_functions_exclude_p (tree fndecl) 665{ 666 if (VEC_length (char_p, flag_instrument_functions_exclude_functions) > 0) 667 { 668 const char *name; 669 int i; 670 char *s; 671 672 name = lang_hooks.decl_printable_name (fndecl, 0); 673 for (i = 0; 674 VEC_iterate (char_p, flag_instrument_functions_exclude_functions, 675 i, s); 676 ++i) 677 { 678 if (strstr (name, s) != NULL) 679 return true; 680 } 681 } 682 683 if (VEC_length (char_p, flag_instrument_functions_exclude_files) > 0) 684 { 685 const char *name; 686 int i; 687 char *s; 688 689 name = DECL_SOURCE_FILE (fndecl); 690 for (i = 0; 691 VEC_iterate (char_p, flag_instrument_functions_exclude_files, i, s); 692 ++i) 693 { 694 if (strstr (name, s) != NULL) 695 return true; 696 } 697 } 698 699 return false; 700} 701 702/* Decode and handle the vector of command line options. LANG_MASK 703 contains has a single bit set representing the current 704 language. */ 705static void 706handle_options (unsigned int argc, const char **argv, unsigned int lang_mask) 707{ 708 unsigned int n, i; 709 710 for (i = 1; i < argc; i += n) 711 { 712 const char *opt = argv[i]; 713 714 /* Interpret "-" or a non-switch as a file name. */ 715 if (opt[0] != '-' || opt[1] == '\0') 716 { 717 if (main_input_filename == NULL) 718 { 719 main_input_filename = opt; 720 main_input_baselength 721 = base_of_path (main_input_filename, &main_input_basename); 722 } 723 add_input_filename (opt); 724 n = 1; 725 continue; 726 } 727 728 n = handle_option (argv + i, lang_mask); 729 730 if (!n) 731 { 732 n = 1; 733 error ("unrecognized command line option \"%s\"", opt); 734 } 735 } 736} 737 738/* Parse command line options and set default flag values. Do minimal 739 options processing. */ 740void 741decode_options (unsigned int argc, const char **argv) 742{ 743 unsigned int i, lang_mask; 744 745 /* Perform language-specific options initialization. */ 746 lang_mask = lang_hooks.init_options (argc, argv); 747 748 lang_hooks.initialize_diagnostics (global_dc); 749 750 /* Scan to see what optimization level has been specified. That will 751 determine the default value of many flags. */ 752 for (i = 1; i < argc; i++) 753 { 754 if (!strcmp (argv[i], "-O")) 755 { 756 optimize = 1; 757 optimize_size = 0; 758 } 759 else if (argv[i][0] == '-' && argv[i][1] == 'O') 760 { 761 /* Handle -Os, -O2, -O3, -O69, ... */ 762 const char *p = &argv[i][2]; 763 764 if ((p[0] == 's') && (p[1] == 0)) 765 { 766 optimize_size = 1; 767 768 /* Optimizing for size forces optimize to be 2. */ 769 optimize = 2; 770 } 771 else 772 { 773 const int optimize_val = read_integral_parameter (p, p - 2, -1); 774 if (optimize_val != -1) 775 { 776 optimize = optimize_val; 777 optimize_size = 0; 778 } 779 } 780 } 781 } 782 783 if (!optimize) 784 { 785 flag_merge_constants = 0; 786 } 787 788 if (optimize >= 1) 789 { 790 flag_defer_pop = 1; 791#ifdef DELAY_SLOTS 792 flag_delayed_branch = 1; 793#endif 794#ifdef CAN_DEBUG_WITHOUT_FP 795 flag_omit_frame_pointer = 1; 796#endif 797 flag_guess_branch_prob = 1; 798 flag_cprop_registers = 1; 799 flag_if_conversion = 1; 800 flag_if_conversion2 = 1; 801 flag_ipa_pure_const = 1; 802 flag_ipa_reference = 1; 803 flag_tree_ccp = 1; 804 flag_tree_dce = 1; 805 flag_tree_dom = 1; 806 flag_tree_dse = 1; 807 flag_tree_ter = 1; 808 flag_tree_live_range_split = 1; 809 flag_tree_sra = 1; 810 flag_tree_copyrename = 1; 811 flag_tree_fre = 1; 812 flag_tree_copy_prop = 1; 813 flag_tree_sink = 1; 814 flag_tree_salias = 1; 815 if (!no_unit_at_a_time_default) 816 flag_unit_at_a_time = 1; 817 818 if (!optimize_size) 819 { 820 /* Loop header copying usually increases size of the code. This used 821 not to be true, since quite often it is possible to verify that 822 the condition is satisfied in the first iteration and therefore 823 to eliminate it. Jump threading handles these cases now. */ 824 flag_tree_ch = 1; 825 } 826 } 827 828 if (optimize >= 2) 829 { 830 flag_thread_jumps = 1; 831 flag_crossjumping = 1; 832 flag_optimize_sibling_calls = 1; 833 flag_cse_follow_jumps = 1; 834 flag_cse_skip_blocks = 1; 835 flag_gcse = 1; 836 flag_expensive_optimizations = 1; 837 flag_ipa_type_escape = 1; 838 flag_rerun_cse_after_loop = 1; 839 flag_caller_saves = 1; 840 flag_peephole2 = 1; 841#ifdef INSN_SCHEDULING 842 flag_schedule_insns = 1; 843 flag_schedule_insns_after_reload = 1; 844#endif 845 flag_regmove = 1; 846 flag_strict_aliasing = 1; 847 flag_strict_overflow = 1; 848 flag_delete_null_pointer_checks = 1; 849 flag_reorder_blocks = 1; 850 flag_reorder_functions = 1; 851 flag_tree_store_ccp = 1; 852 flag_tree_store_copy_prop = 1; 853 /* XXX: some issues with ports have been traced to -ftree-vrp. 854 So remove it from -O2 and above. Note that jdk1{5,6} are affected 855 and they build with w/-O3 - so we cannot just move it to -O3. */ 856 /* flag_tree_vrp = 1; // See GCC tree-optimization/33099 */ 857 858 if (!optimize_size) 859 { 860 /* PRE tends to generate bigger code. */ 861 flag_tree_pre = 1; 862 } 863 } 864 865 if (optimize >= 3) 866 { 867 flag_inline_functions = 1; 868 flag_unswitch_loops = 1; 869 flag_gcse_after_reload = 1; 870 } 871 872 if (optimize_size) 873 { 874 align_loops = 1; 875 align_jumps = 1; 876 align_labels = 1; 877 align_functions = 1; 878 879 /* Don't reorder blocks when optimizing for size because extra 880 jump insns may be created; also barrier may create extra padding. 881 882 More correctly we should have a block reordering mode that tried 883 to minimize the combined size of all the jumps. This would more 884 or less automatically remove extra jumps, but would also try to 885 use more short jumps instead of long jumps. */ 886 flag_reorder_blocks = 0; 887 flag_reorder_blocks_and_partition = 0; 888 } 889 890 if (optimize_size) 891 { 892 /* Inlining of very small functions usually reduces total size. */ 893 set_param_value ("max-inline-insns-single", 5); 894 set_param_value ("max-inline-insns-auto", 5); 895 flag_inline_functions = 1; 896 897 /* We want to crossjump as much as possible. */ 898 set_param_value ("min-crossjump-insns", 1); 899 } 900 901 /* Initialize whether `char' is signed. */ 902 flag_signed_char = DEFAULT_SIGNED_CHAR; 903 /* Set this to a special "uninitialized" value. The actual default is set 904 after target options have been processed. */ 905 flag_short_enums = 2; 906 907 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can 908 modify it. */ 909 target_flags = targetm.default_target_flags; 910 911 /* Some tagets have ABI-specified unwind tables. */ 912 flag_unwind_tables = targetm.unwind_tables_default; 913 914#ifdef OPTIMIZATION_OPTIONS 915 /* Allow default optimizations to be specified on a per-machine basis. */ 916 OPTIMIZATION_OPTIONS (optimize, optimize_size); 917#endif 918 919 handle_options (argc, argv, lang_mask); 920 921 if (flag_pie) 922 flag_pic = flag_pie; 923 if (flag_pic && !flag_pie) 924 flag_shlib = 1; 925 926 if (flag_no_inline == 2) 927 flag_no_inline = 0; 928 else 929 flag_really_no_inline = flag_no_inline; 930 931 /* Set flag_no_inline before the post_options () hook. The C front 932 ends use it to determine tree inlining defaults. FIXME: such 933 code should be lang-independent when all front ends use tree 934 inlining, in which case it, and this condition, should be moved 935 to the top of process_options() instead. */ 936 if (optimize == 0) 937 { 938 /* Inlining does not work if not optimizing, 939 so force it not to be done. */ 940 flag_no_inline = 1; 941 warn_inline = 0; 942 943 /* The c_decode_option function and decode_option hook set 944 this to `2' if -Wall is used, so we can avoid giving out 945 lots of errors for people who don't realize what -Wall does. */ 946 if (warn_uninitialized == 1) 947 warning (OPT_Wuninitialized, 948 "-Wuninitialized is not supported without -O"); 949 } 950 951 if (flag_really_no_inline == 2) 952 flag_really_no_inline = flag_no_inline; 953 954 /* The optimization to partition hot and cold basic blocks into separate 955 sections of the .o and executable files does not work (currently) 956 with exception handling. This is because there is no support for 957 generating unwind info. If flag_exceptions is turned on we need to 958 turn off the partitioning optimization. */ 959 960 if (flag_exceptions && flag_reorder_blocks_and_partition) 961 { 962 inform 963 ("-freorder-blocks-and-partition does not work with exceptions"); 964 flag_reorder_blocks_and_partition = 0; 965 flag_reorder_blocks = 1; 966 } 967 968 /* If user requested unwind info, then turn off the partitioning 969 optimization. */ 970 971 if (flag_unwind_tables && ! targetm.unwind_tables_default 972 && flag_reorder_blocks_and_partition) 973 { 974 inform ("-freorder-blocks-and-partition does not support unwind info"); 975 flag_reorder_blocks_and_partition = 0; 976 flag_reorder_blocks = 1; 977 } 978 979 /* If the target requested unwind info, then turn off the partitioning 980 optimization with a different message. Likewise, if the target does not 981 support named sections. */ 982 983 if (flag_reorder_blocks_and_partition 984 && (!targetm.have_named_sections 985 || (flag_unwind_tables && targetm.unwind_tables_default))) 986 { 987 inform 988 ("-freorder-blocks-and-partition does not work on this architecture"); 989 flag_reorder_blocks_and_partition = 0; 990 flag_reorder_blocks = 1; 991 } 992} 993 994/* Handle target- and language-independent options. Return zero to 995 generate an "unknown option" message. Only options that need 996 extra handling need to be listed here; if you simply want 997 VALUE assigned to a variable, it happens automatically. */ 998 999static int 1000common_handle_option (size_t scode, const char *arg, int value, 1001 unsigned int lang_mask) 1002{ 1003 enum opt_code code = (enum opt_code) scode; 1004 1005 switch (code) 1006 { 1007 case OPT__help: 1008 print_help (); 1009 exit_after_options = true; 1010 break; 1011 1012 case OPT__param: 1013 handle_param (arg); 1014 break; 1015 1016 case OPT__target_help: 1017 print_target_help (); 1018 exit_after_options = true; 1019 break; 1020 1021 case OPT__version: 1022 print_version (stderr, ""); 1023 exit_after_options = true; 1024 break; 1025 1026 case OPT_G: 1027 g_switch_value = value; 1028 g_switch_set = true; 1029 break; 1030 1031 case OPT_O: 1032 case OPT_Os: 1033 /* Currently handled in a prescan. */ 1034 break; 1035 1036 case OPT_W: 1037 /* For backward compatibility, -W is the same as -Wextra. */ 1038 set_Wextra (value); 1039 break; 1040 1041 case OPT_Werror_: 1042 { 1043 char *new_option; 1044 int option_index; 1045 new_option = XNEWVEC (char, strlen (arg) + 2); 1046 new_option[0] = 'W'; 1047 strcpy (new_option+1, arg); 1048 option_index = find_opt (new_option, lang_mask); 1049 if (option_index == N_OPTS) 1050 { 1051 error ("-Werror=%s: No option -%s", arg, new_option); 1052 } 1053 else 1054 { 1055 int kind = value ? DK_ERROR : DK_WARNING; 1056 diagnostic_classify_diagnostic (global_dc, option_index, kind); 1057 1058 /* -Werror=foo implies -Wfoo. */ 1059 if (cl_options[option_index].var_type == CLVC_BOOLEAN 1060 && cl_options[option_index].flag_var 1061 && kind == DK_ERROR) 1062 *(int *) cl_options[option_index].flag_var = 1; 1063 free (new_option); 1064 } 1065 } 1066 break; 1067 1068 case OPT_Wextra: 1069 set_Wextra (value); 1070 break; 1071 1072 case OPT_Wlarger_than_: 1073 larger_than_size = value; 1074 warn_larger_than = value != -1; 1075 break; 1076 1077 case OPT_Wframe_larger_than_: 1078 frame_larger_than_size = value; 1079 warn_frame_larger_than = value != -1; 1080 break; 1081 1082 case OPT_Wstrict_aliasing: 1083 set_warn_strict_aliasing (value); 1084 break; 1085 1086 case OPT_Wstrict_aliasing_: 1087 warn_strict_aliasing = value; 1088 break; 1089 1090 case OPT_Wstrict_overflow: 1091 warn_strict_overflow = (value 1092 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL 1093 : 0); 1094 break; 1095 1096 case OPT_Wstrict_overflow_: 1097 warn_strict_overflow = value; 1098 break; 1099 1100 case OPT_Wunused: 1101 set_Wunused (value); 1102 break; 1103 1104 case OPT_aux_info: 1105 case OPT_aux_info_: 1106 aux_info_file_name = arg; 1107 flag_gen_aux_info = 1; 1108 break; 1109 1110 case OPT_auxbase: 1111 aux_base_name = arg; 1112 break; 1113 1114 case OPT_auxbase_strip: 1115 { 1116 char *tmp = xstrdup (arg); 1117 strip_off_ending (tmp, strlen (tmp)); 1118 if (tmp[0]) 1119 aux_base_name = tmp; 1120 } 1121 break; 1122 1123 case OPT_d: 1124 decode_d_option (arg); 1125 break; 1126 1127 case OPT_dumpbase: 1128 dump_base_name = arg; 1129 break; 1130 1131 case OPT_falign_functions_: 1132 align_functions = value; 1133 break; 1134 1135 case OPT_falign_jumps_: 1136 align_jumps = value; 1137 break; 1138 1139 case OPT_falign_labels_: 1140 align_labels = value; 1141 break; 1142 1143 case OPT_falign_loops_: 1144 align_loops = value; 1145 break; 1146 1147 case OPT_fbranch_probabilities: 1148 flag_branch_probabilities_set = true; 1149 break; 1150 1151 case OPT_fcall_used_: 1152 fix_register (arg, 0, 1); 1153 break; 1154 1155 case OPT_fcall_saved_: 1156 fix_register (arg, 0, 0); 1157 break; 1158 1159 case OPT_fdiagnostics_show_location_: 1160 if (!strcmp (arg, "once")) 1161 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE; 1162 else if (!strcmp (arg, "every-line")) 1163 diagnostic_prefixing_rule (global_dc) 1164 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE; 1165 else 1166 return 0; 1167 break; 1168 1169 case OPT_fdiagnostics_show_option: 1170 global_dc->show_option_requested = true; 1171 break; 1172 1173 case OPT_fdump_: 1174 if (!dump_switch_p (arg)) 1175 return 0; 1176 break; 1177 1178 case OPT_ffast_math: 1179 set_fast_math_flags (value); 1180 break; 1181 1182 case OPT_ffixed_: 1183 fix_register (arg, 1, 1); 1184 break; 1185 1186 case OPT_finline_limit_: 1187 case OPT_finline_limit_eq: 1188 set_param_value ("max-inline-insns-single", value / 2); 1189 set_param_value ("max-inline-insns-auto", value / 2); 1190 break; 1191 1192 case OPT_finstrument_functions_exclude_function_list_: 1193 add_instrument_functions_exclude_list 1194 (&flag_instrument_functions_exclude_functions, arg); 1195 break; 1196 1197 case OPT_finstrument_functions_exclude_file_list_: 1198 add_instrument_functions_exclude_list 1199 (&flag_instrument_functions_exclude_files, arg); 1200 break; 1201 1202 case OPT_fmessage_length_: 1203 pp_set_line_maximum_length (global_dc->printer, value); 1204 break; 1205 1206 case OPT_fpack_struct_: 1207 if (value <= 0 || (value & (value - 1)) || value > 16) 1208 error("structure alignment must be a small power of two, not %d", value); 1209 else 1210 { 1211 initial_max_fld_align = value; 1212 maximum_field_alignment = value * BITS_PER_UNIT; 1213 } 1214 break; 1215 1216 case OPT_fpeel_loops: 1217 flag_peel_loops_set = true; 1218 break; 1219 1220 case OPT_fprofile_arcs: 1221 profile_arc_flag_set = true; 1222 break; 1223 1224 case OPT_fprofile_use: 1225 if (!flag_branch_probabilities_set) 1226 flag_branch_probabilities = value; 1227 if (!flag_profile_values_set) 1228 flag_profile_values = value; 1229 if (!flag_unroll_loops_set) 1230 flag_unroll_loops = value; 1231 if (!flag_peel_loops_set) 1232 flag_peel_loops = value; 1233 if (!flag_tracer_set) 1234 flag_tracer = value; 1235 if (!flag_value_profile_transformations_set) 1236 flag_value_profile_transformations = value; 1237 break; 1238 1239 case OPT_fprofile_generate: 1240 if (!profile_arc_flag_set) 1241 profile_arc_flag = value; 1242 if (!flag_profile_values_set) 1243 flag_profile_values = value; 1244 if (!flag_value_profile_transformations_set) 1245 flag_value_profile_transformations = value; 1246 break; 1247 1248 case OPT_fprofile_values: 1249 flag_profile_values_set = true; 1250 break; 1251 1252 case OPT_fvisibility_: 1253 { 1254 if (!strcmp(arg, "default")) 1255 default_visibility = VISIBILITY_DEFAULT; 1256 else if (!strcmp(arg, "internal")) 1257 default_visibility = VISIBILITY_INTERNAL; 1258 else if (!strcmp(arg, "hidden")) 1259 default_visibility = VISIBILITY_HIDDEN; 1260 else if (!strcmp(arg, "protected")) 1261 default_visibility = VISIBILITY_PROTECTED; 1262 else 1263 error ("unrecognized visibility value \"%s\"", arg); 1264 } 1265 break; 1266 1267 case OPT_fvpt: 1268 flag_value_profile_transformations_set = true; 1269 break; 1270 1271 case OPT_frandom_seed: 1272 /* The real switch is -fno-random-seed. */ 1273 if (value) 1274 return 0; 1275 flag_random_seed = NULL; 1276 break; 1277 1278 case OPT_frandom_seed_: 1279 flag_random_seed = arg; 1280 break; 1281 1282 case OPT_fsched_verbose_: 1283#ifdef INSN_SCHEDULING 1284 fix_sched_param ("verbose", arg); 1285 break; 1286#else 1287 return 0; 1288#endif 1289 1290 case OPT_fsched_stalled_insns_: 1291 flag_sched_stalled_insns = value; 1292 if (flag_sched_stalled_insns == 0) 1293 flag_sched_stalled_insns = -1; 1294 break; 1295 1296 case OPT_fsched_stalled_insns_dep_: 1297 flag_sched_stalled_insns_dep = value; 1298 break; 1299 1300 case OPT_fstack_limit: 1301 /* The real switch is -fno-stack-limit. */ 1302 if (value) 1303 return 0; 1304 stack_limit_rtx = NULL_RTX; 1305 break; 1306 1307 case OPT_fstack_limit_register_: 1308 { 1309 int reg = decode_reg_name (arg); 1310 if (reg < 0) 1311 error ("unrecognized register name \"%s\"", arg); 1312 else 1313 stack_limit_rtx = gen_rtx_REG (Pmode, reg); 1314 } 1315 break; 1316 1317 case OPT_fstack_limit_symbol_: 1318 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg)); 1319 break; 1320 1321 case OPT_ftree_vectorizer_verbose_: 1322 vect_set_verbosity_level (arg); 1323 break; 1324 1325 case OPT_ftls_model_: 1326 if (!strcmp (arg, "global-dynamic")) 1327 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC; 1328 else if (!strcmp (arg, "local-dynamic")) 1329 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC; 1330 else if (!strcmp (arg, "initial-exec")) 1331 flag_tls_default = TLS_MODEL_INITIAL_EXEC; 1332 else if (!strcmp (arg, "local-exec")) 1333 flag_tls_default = TLS_MODEL_LOCAL_EXEC; 1334 else 1335 warning (0, "unknown tls-model \"%s\"", arg); 1336 break; 1337 1338 case OPT_ftracer: 1339 flag_tracer_set = true; 1340 break; 1341 1342 case OPT_funroll_loops: 1343 flag_unroll_loops_set = true; 1344 break; 1345 1346 case OPT_g: 1347 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg); 1348 break; 1349 1350 case OPT_gcoff: 1351 set_debug_level (SDB_DEBUG, false, arg); 1352 break; 1353 1354 case OPT_gdwarf_2: 1355 set_debug_level (DWARF2_DEBUG, false, arg); 1356 break; 1357 1358 case OPT_ggdb: 1359 set_debug_level (NO_DEBUG, 2, arg); 1360 break; 1361 1362 case OPT_gstabs: 1363 case OPT_gstabs_: 1364 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg); 1365 break; 1366 1367 case OPT_gvms: 1368 set_debug_level (VMS_DEBUG, false, arg); 1369 break; 1370 1371 case OPT_gxcoff: 1372 case OPT_gxcoff_: 1373 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg); 1374 break; 1375 1376 case OPT_o: 1377 asm_file_name = arg; 1378 break; 1379 1380 case OPT_pedantic_errors: 1381 flag_pedantic_errors = pedantic = 1; 1382 break; 1383 1384 case OPT_fforce_mem: 1385 warning (0, "-f[no-]force-mem is nop and option will be removed in 4.3"); 1386 break; 1387 1388 case OPT_floop_optimize: 1389 case OPT_frerun_loop_opt: 1390 case OPT_fstrength_reduce: 1391 /* These are no-ops, preserved for backward compatibility. */ 1392 break; 1393 1394 default: 1395 /* If the flag was handled in a standard way, assume the lack of 1396 processing here is intentional. */ 1397 gcc_assert (cl_options[scode].flag_var); 1398 break; 1399 } 1400 1401 return 1; 1402} 1403 1404/* Handle --param NAME=VALUE. */ 1405static void 1406handle_param (const char *carg) 1407{ 1408 char *equal, *arg; 1409 int value; 1410 1411 arg = xstrdup (carg); 1412 equal = strchr (arg, '='); 1413 if (!equal) 1414 error ("%s: --param arguments should be of the form NAME=VALUE", arg); 1415 else 1416 { 1417 value = integral_argument (equal + 1); 1418 if (value == -1) 1419 error ("invalid --param value %qs", equal + 1); 1420 else 1421 { 1422 *equal = '\0'; 1423 set_param_value (arg, value); 1424 } 1425 } 1426 1427 free (arg); 1428} 1429 1430/* Handle -W and -Wextra. */ 1431static void 1432set_Wextra (int setting) 1433{ 1434 extra_warnings = setting; 1435 warn_unused_value = setting; 1436 warn_unused_parameter = (setting && maybe_warn_unused_parameter); 1437 1438 /* We save the value of warn_uninitialized, since if they put 1439 -Wuninitialized on the command line, we need to generate a 1440 warning about not using it without also specifying -O. */ 1441 if (setting == 0) 1442 warn_uninitialized = 0; 1443 else if (warn_uninitialized != 1) 1444 warn_uninitialized = 2; 1445} 1446 1447/* Initialize unused warning flags. */ 1448void 1449set_Wunused (int setting) 1450{ 1451 warn_unused_function = setting; 1452 warn_unused_label = setting; 1453 /* Unused function parameter warnings are reported when either 1454 ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified. 1455 Thus, if -Wextra has already been seen, set warn_unused_parameter; 1456 otherwise set maybe_warn_extra_parameter, which will be picked up 1457 by set_Wextra. */ 1458 maybe_warn_unused_parameter = setting; 1459 warn_unused_parameter = (setting && extra_warnings); 1460 warn_unused_variable = setting; 1461 warn_unused_value = setting; 1462} 1463 1464/* Used to set the level of strict aliasing warnings, 1465 when no level is specified (i.e., when -Wstrict-aliasing, and not 1466 -Wstrict-aliasing=level was given). 1467 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified, 1468 and 0 otherwise. After calling this function, wstrict_aliasing will be 1469 set to the default value of -Wstrict_aliasing=level, currently 3. */ 1470void 1471set_warn_strict_aliasing (int onoff) 1472{ 1473 gcc_assert (onoff == 0 || onoff == 1); 1474 if (onoff != 0) 1475 warn_strict_aliasing = 3; 1476} 1477 1478/* The following routines are useful in setting all the flags that 1479 -ffast-math and -fno-fast-math imply. */ 1480void 1481set_fast_math_flags (int set) 1482{ 1483 flag_trapping_math = !set; 1484 flag_unsafe_math_optimizations = set; 1485 flag_finite_math_only = set; 1486 flag_errno_math = !set; 1487 if (set) 1488 { 1489 flag_signaling_nans = 0; 1490 flag_rounding_math = 0; 1491 flag_cx_limited_range = 1; 1492 } 1493} 1494 1495/* Return true iff flags are set as if -ffast-math. */ 1496bool 1497fast_math_flags_set_p (void) 1498{ 1499 return (!flag_trapping_math 1500 && flag_unsafe_math_optimizations 1501 && flag_finite_math_only 1502 && !flag_errno_math); 1503} 1504 1505/* Handle a debug output -g switch. EXTENDED is true or false to support 1506 extended output (2 is special and means "-ggdb" was given). */ 1507static void 1508set_debug_level (enum debug_info_type type, int extended, const char *arg) 1509{ 1510 static bool type_explicit; 1511 1512 use_gnu_debug_info_extensions = extended; 1513 1514 if (type == NO_DEBUG) 1515 { 1516 if (write_symbols == NO_DEBUG) 1517 { 1518 write_symbols = PREFERRED_DEBUGGING_TYPE; 1519 1520 if (extended == 2) 1521 { 1522#ifdef DWARF2_DEBUGGING_INFO 1523 write_symbols = DWARF2_DEBUG; 1524#elif defined DBX_DEBUGGING_INFO 1525 write_symbols = DBX_DEBUG; 1526#endif 1527 } 1528 1529 if (write_symbols == NO_DEBUG) 1530 warning (0, "target system does not support debug output"); 1531 } 1532 } 1533 else 1534 { 1535 /* Does it conflict with an already selected type? */ 1536 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols) 1537 error ("debug format \"%s\" conflicts with prior selection", 1538 debug_type_names[type]); 1539 write_symbols = type; 1540 type_explicit = true; 1541 } 1542 1543 /* A debug flag without a level defaults to level 2. */ 1544 if (*arg == '\0') 1545 { 1546 if (!debug_info_level) 1547 debug_info_level = 2; 1548 } 1549 else 1550 { 1551 debug_info_level = integral_argument (arg); 1552 if (debug_info_level == (unsigned int) -1) 1553 error ("unrecognised debug output level \"%s\"", arg); 1554 else if (debug_info_level > 3) 1555 error ("debug output level %s is too high", arg); 1556 } 1557} 1558 1559/* Display help for target options. */ 1560static void 1561print_target_help (void) 1562{ 1563 unsigned int i; 1564 static bool displayed = false; 1565 1566 /* Avoid double printing for --help --target-help. */ 1567 if (displayed) 1568 return; 1569 1570 displayed = true; 1571 for (i = 0; i < cl_options_count; i++) 1572 if ((cl_options[i].flags & (CL_TARGET | CL_UNDOCUMENTED)) == CL_TARGET) 1573 { 1574 printf (_("\nTarget specific options:\n")); 1575 print_filtered_help (CL_TARGET); 1576 break; 1577 } 1578} 1579 1580/* Output --help text. */ 1581static void 1582print_help (void) 1583{ 1584 size_t i; 1585 const char *p; 1586 1587 GET_ENVIRONMENT (p, "COLUMNS"); 1588 if (p) 1589 { 1590 int value = atoi (p); 1591 if (value > 0) 1592 columns = value; 1593 } 1594 1595 puts (_("The following options are language-independent:\n")); 1596 1597 print_filtered_help (CL_COMMON); 1598 print_param_help (); 1599 1600 for (i = 0; lang_names[i]; i++) 1601 { 1602 printf (_("The %s front end recognizes the following options:\n\n"), 1603 lang_names[i]); 1604 print_filtered_help (1U << i); 1605 } 1606 print_target_help (); 1607} 1608 1609/* Print the help for --param. */ 1610static void 1611print_param_help (void) 1612{ 1613 size_t i; 1614 1615 puts (_("The --param option recognizes the following as parameters:\n")); 1616 1617 for (i = 0; i < LAST_PARAM; i++) 1618 { 1619 const char *help = compiler_params[i].help; 1620 const char *param = compiler_params[i].option; 1621 1622 if (help == NULL || *help == '\0') 1623 help = undocumented_msg; 1624 1625 /* Get the translation. */ 1626 help = _(help); 1627 1628 wrap_help (help, param, strlen (param)); 1629 } 1630 1631 putchar ('\n'); 1632} 1633 1634/* Print help for a specific front-end, etc. */ 1635static void 1636print_filtered_help (unsigned int flag) 1637{ 1638 unsigned int i, len, filter, indent = 0; 1639 bool duplicates = false; 1640 const char *help, *opt, *tab; 1641 static char *printed; 1642 1643 if (flag == CL_COMMON || flag == CL_TARGET) 1644 { 1645 filter = flag; 1646 if (!printed) 1647 printed = xmalloc (cl_options_count); 1648 memset (printed, 0, cl_options_count); 1649 } 1650 else 1651 { 1652 /* Don't print COMMON options twice. */ 1653 filter = flag | CL_COMMON; 1654 1655 for (i = 0; i < cl_options_count; i++) 1656 { 1657 if ((cl_options[i].flags & filter) != flag) 1658 continue; 1659 1660 /* Skip help for internal switches. */ 1661 if (cl_options[i].flags & CL_UNDOCUMENTED) 1662 continue; 1663 1664 /* Skip switches that have already been printed, mark them to be 1665 listed later. */ 1666 if (printed[i]) 1667 { 1668 duplicates = true; 1669 indent = print_switch (cl_options[i].opt_text, indent); 1670 } 1671 } 1672 1673 if (duplicates) 1674 { 1675 putchar ('\n'); 1676 putchar ('\n'); 1677 } 1678 } 1679 1680 for (i = 0; i < cl_options_count; i++) 1681 { 1682 if ((cl_options[i].flags & filter) != flag) 1683 continue; 1684 1685 /* Skip help for internal switches. */ 1686 if (cl_options[i].flags & CL_UNDOCUMENTED) 1687 continue; 1688 1689 /* Skip switches that have already been printed. */ 1690 if (printed[i]) 1691 continue; 1692 1693 printed[i] = true; 1694 1695 help = cl_options[i].help; 1696 if (!help) 1697 help = undocumented_msg; 1698 1699 /* Get the translation. */ 1700 help = _(help); 1701 1702 tab = strchr (help, '\t'); 1703 if (tab) 1704 { 1705 len = tab - help; 1706 opt = help; 1707 help = tab + 1; 1708 } 1709 else 1710 { 1711 opt = cl_options[i].opt_text; 1712 len = strlen (opt); 1713 } 1714 1715 wrap_help (help, opt, len); 1716 } 1717 1718 putchar ('\n'); 1719} 1720 1721/* Output ITEM, of length ITEM_WIDTH, in the left column, followed by 1722 word-wrapped HELP in a second column. */ 1723static unsigned int 1724print_switch (const char *text, unsigned int indent) 1725{ 1726 unsigned int len = strlen (text) + 1; /* trailing comma */ 1727 1728 if (indent) 1729 { 1730 putchar (','); 1731 if (indent + len > columns) 1732 { 1733 putchar ('\n'); 1734 putchar (' '); 1735 indent = 1; 1736 } 1737 } 1738 else 1739 putchar (' '); 1740 1741 putchar (' '); 1742 fputs (text, stdout); 1743 1744 return indent + len + 1; 1745} 1746 1747/* Output ITEM, of length ITEM_WIDTH, in the left column, followed by 1748 word-wrapped HELP in a second column. */ 1749static void 1750wrap_help (const char *help, const char *item, unsigned int item_width) 1751{ 1752 unsigned int col_width = 27; 1753 unsigned int remaining, room, len; 1754 1755 remaining = strlen (help); 1756 1757 do 1758 { 1759 room = columns - 3 - MAX (col_width, item_width); 1760 if (room > columns) 1761 room = 0; 1762 len = remaining; 1763 1764 if (room < len) 1765 { 1766 unsigned int i; 1767 1768 for (i = 0; help[i]; i++) 1769 { 1770 if (i >= room && len != remaining) 1771 break; 1772 if (help[i] == ' ') 1773 len = i; 1774 else if ((help[i] == '-' || help[i] == '/') 1775 && help[i + 1] != ' ' 1776 && i > 0 && ISALPHA (help[i - 1])) 1777 len = i + 1; 1778 } 1779 } 1780 1781 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help); 1782 item_width = 0; 1783 while (help[len] == ' ') 1784 len++; 1785 help += len; 1786 remaining -= len; 1787 } 1788 while (remaining); 1789} 1790 1791/* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't 1792 a simple on-off switch. */ 1793 1794int 1795option_enabled (int opt_idx) 1796{ 1797 const struct cl_option *option = &(cl_options[opt_idx]); 1798 if (option->flag_var) 1799 switch (option->var_type) 1800 { 1801 case CLVC_BOOLEAN: 1802 return *(int *) option->flag_var != 0; 1803 1804 case CLVC_EQUAL: 1805 return *(int *) option->flag_var == option->var_value; 1806 1807 case CLVC_BIT_CLEAR: 1808 return (*(int *) option->flag_var & option->var_value) == 0; 1809 1810 case CLVC_BIT_SET: 1811 return (*(int *) option->flag_var & option->var_value) != 0; 1812 1813 case CLVC_STRING: 1814 break; 1815 } 1816 return -1; 1817} 1818 1819/* Fill STATE with the current state of option OPTION. Return true if 1820 there is some state to store. */ 1821 1822bool 1823get_option_state (int option, struct cl_option_state *state) 1824{ 1825 if (cl_options[option].flag_var == 0) 1826 return false; 1827 1828 switch (cl_options[option].var_type) 1829 { 1830 case CLVC_BOOLEAN: 1831 case CLVC_EQUAL: 1832 state->data = cl_options[option].flag_var; 1833 state->size = sizeof (int); 1834 break; 1835 1836 case CLVC_BIT_CLEAR: 1837 case CLVC_BIT_SET: 1838 state->ch = option_enabled (option); 1839 state->data = &state->ch; 1840 state->size = 1; 1841 break; 1842 1843 case CLVC_STRING: 1844 state->data = *(const char **) cl_options[option].flag_var; 1845 if (state->data == 0) 1846 state->data = ""; 1847 state->size = strlen (state->data) + 1; 1848 break; 1849 } 1850 return true; 1851} 1852