1 /* Top level of GCC compilers (cc1, cc1plus, etc.) 2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 4 2011 Free Software Foundation, Inc. 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 /* This is the top level of cc1/c++. 23 It parses command args, opens files, invokes the various passes 24 in the proper order, and counts the time used by each. 25 Error messages and low-level interface to malloc also handled here. */ 26 27 #include "config.h" 28 #include "system.h" 29 #include "coretypes.h" 30 #include "tm.h" 31 #include "line-map.h" 32 #include "input.h" 33 #include "tree.h" 34 #include "realmpfr.h" /* For GMP/MPFR/MPC versions, in print_version. */ 35 #include "version.h" 36 #include "rtl.h" 37 #include "tm_p.h" 38 #include "flags.h" 39 #include "insn-attr.h" 40 #include "insn-config.h" 41 #include "insn-flags.h" 42 #include "hard-reg-set.h" 43 #include "recog.h" 44 #include "output.h" 45 #include "except.h" 46 #include "function.h" 47 #include "toplev.h" 48 #include "expr.h" 49 #include "basic-block.h" 50 #include "intl.h" 51 #include "ggc.h" 52 #include "graph.h" 53 #include "regs.h" 54 #include "timevar.h" 55 #include "diagnostic.h" 56 #include "tree-diagnostic.h" 57 #include "tree-pretty-print.h" 58 #include "params.h" 59 #include "reload.h" 60 #include "ira.h" 61 #include "dwarf2asm.h" 62 #include "integrate.h" 63 #include "debug.h" 64 #include "target.h" 65 #include "common/common-target.h" 66 #include "langhooks.h" 67 #include "cfglayout.h" 68 #include "cfgloop.h" 69 #include "hosthooks.h" 70 #include "cgraph.h" 71 #include "opts.h" 72 #include "opts-diagnostic.h" 73 #include "coverage.h" 74 #include "value-prof.h" 75 #include "alloc-pool.h" 76 #include "tree-mudflap.h" 77 #include "tree-pass.h" 78 #include "gimple.h" 79 #include "tree-ssa-alias.h" 80 #include "plugin.h" 81 82 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO) 83 #include "dwarf2out.h" 84 #endif 85 86 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) 87 #include "dbxout.h" 88 #endif 89 90 #ifdef SDB_DEBUGGING_INFO 91 #include "sdbout.h" 92 #endif 93 94 #ifdef XCOFF_DEBUGGING_INFO 95 #include "xcoffout.h" /* Needed for external data 96 declarations for e.g. AIX 4.x. */ 97 #endif 98 99 static void general_init (const char *); 100 static void do_compile (void); 101 static void process_options (void); 102 static void backend_init (void); 103 static int lang_dependent_init (const char *); 104 static void init_asm_output (const char *); 105 static void finalize (bool); 106 107 static void crash_signal (int) ATTRIBUTE_NORETURN; 108 static void compile_file (void); 109 110 /* True if we don't need a backend (e.g. preprocessing only). */ 111 static bool no_backend; 112 113 /* Length of line when printing switch values. */ 114 #define MAX_LINE 75 115 116 /* Decoded options, and number of such options. */ 117 struct cl_decoded_option *save_decoded_options; 118 unsigned int save_decoded_options_count; 119 120 /* Used to enable -fvar-tracking, -fweb and -frename-registers according 121 to optimize in process_options (). */ 122 #define AUTODETECT_VALUE 2 123 124 /* Debug hooks - dependent upon command line options. */ 125 126 const struct gcc_debug_hooks *debug_hooks; 127 128 /* The FUNCTION_DECL for the function currently being compiled, 129 or 0 if between functions. */ 130 tree current_function_decl; 131 132 /* Set to the FUNC_BEGIN label of the current function, or NULL 133 if none. */ 134 const char * current_function_func_begin_label; 135 136 /* A random sequence of characters, unless overridden by user. */ 137 static const char *flag_random_seed; 138 139 /* A local time stamp derived from the time of compilation. It will be 140 zero if the system cannot provide a time. It will be -1u, if the 141 user has specified a particular random seed. */ 142 unsigned local_tick; 143 144 /* Random number for this compilation */ 145 HOST_WIDE_INT random_seed; 146 147 /* -f flags. */ 148 149 /* Nonzero means make permerror produce warnings instead of errors. */ 150 151 int flag_permissive = 0; 152 153 /* When non-NULL, indicates that whenever space is allocated on the 154 stack, the resulting stack pointer must not pass this 155 address---that is, for stacks that grow downward, the stack pointer 156 must always be greater than or equal to this address; for stacks 157 that grow upward, the stack pointer must be less than this address. 158 At present, the rtx may be either a REG or a SYMBOL_REF, although 159 the support provided depends on the backend. */ 160 rtx stack_limit_rtx; 161 162 /* True if the user has tagged the function with the 'section' 163 attribute. */ 164 165 bool user_defined_section_attribute = false; 166 167 struct target_flag_state default_target_flag_state; 168 #if SWITCHABLE_TARGET 169 struct target_flag_state *this_target_flag_state = &default_target_flag_state; 170 #else 171 #define this_target_flag_state (&default_target_flag_state) 172 #endif 173 174 /* The user symbol prefix after having resolved same. */ 175 const char *user_label_prefix; 176 177 /* Output files for assembler code (real compiler output) 178 and debugging dumps. */ 179 180 FILE *asm_out_file; 181 FILE *aux_info_file; 182 FILE *stack_usage_file = NULL; 183 FILE *dump_file = NULL; 184 const char *dump_file_name; 185 186 /* The current working directory of a translation. It's generally the 187 directory from which compilation was initiated, but a preprocessed 188 file may specify the original directory in which it was 189 created. */ 190 191 static const char *src_pwd; 192 193 /* Initialize src_pwd with the given string, and return true. If it 194 was already initialized, return false. As a special case, it may 195 be called with a NULL argument to test whether src_pwd has NOT been 196 initialized yet. */ 197 198 bool 199 set_src_pwd (const char *pwd) 200 { 201 if (src_pwd) 202 { 203 if (strcmp (src_pwd, pwd) == 0) 204 return true; 205 else 206 return false; 207 } 208 209 src_pwd = xstrdup (pwd); 210 return true; 211 } 212 213 /* Return the directory from which the translation unit was initiated, 214 in case set_src_pwd() was not called before to assign it a 215 different value. */ 216 217 const char * 218 get_src_pwd (void) 219 { 220 if (! src_pwd) 221 { 222 src_pwd = getpwd (); 223 if (!src_pwd) 224 src_pwd = "."; 225 } 226 227 return src_pwd; 228 } 229 230 /* Called when the start of a function definition is parsed, 231 this function prints on stderr the name of the function. */ 232 void 233 announce_function (tree decl) 234 { 235 if (!quiet_flag) 236 { 237 if (rtl_dump_and_exit) 238 fprintf (stderr, "%s ", 239 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl)))); 240 else 241 fprintf (stderr, " %s", 242 identifier_to_locale (lang_hooks.decl_printable_name (decl, 2))); 243 fflush (stderr); 244 pp_needs_newline (global_dc->printer) = true; 245 diagnostic_set_last_function (global_dc, (diagnostic_info *) NULL); 246 } 247 } 248 249 /* Initialize local_tick with a random number or -1 if 250 flag_random_seed is set. */ 251 252 static void 253 init_local_tick (void) 254 { 255 if (!flag_random_seed) 256 { 257 /* Try urandom first. Time of day is too likely to collide. 258 In case of any error we just use the local tick. */ 259 260 int fd = open ("/dev/urandom", O_RDONLY); 261 if (fd >= 0) 262 { 263 read (fd, &random_seed, sizeof (random_seed)); 264 close (fd); 265 } 266 267 /* Now get the tick anyways */ 268 #ifdef HAVE_GETTIMEOFDAY 269 { 270 struct timeval tv; 271 272 gettimeofday (&tv, NULL); 273 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000; 274 } 275 #else 276 { 277 time_t now = time (NULL); 278 279 if (now != (time_t)-1) 280 local_tick = (unsigned) now; 281 } 282 #endif 283 } 284 else 285 local_tick = -1; 286 } 287 288 /* Set up a default flag_random_seed and local_tick, unless the user 289 already specified one. Must be called after init_local_tick. */ 290 291 static void 292 init_random_seed (void) 293 { 294 if (flag_random_seed) 295 { 296 char *endp; 297 298 /* When the driver passed in a hex number don't crc it again */ 299 random_seed = strtoul (flag_random_seed, &endp, 0); 300 if (!(endp > flag_random_seed && *endp == 0)) 301 random_seed = crc32_string (0, flag_random_seed); 302 } 303 else if (!random_seed) 304 random_seed = local_tick ^ getpid (); /* Old racey fallback method */ 305 } 306 307 /* Obtain the random_seed. Unless NOINIT, initialize it if 308 it's not provided in the command line. */ 309 310 HOST_WIDE_INT 311 get_random_seed (bool noinit) 312 { 313 if (!flag_random_seed && !noinit) 314 init_random_seed (); 315 return random_seed; 316 } 317 318 /* Modify the random_seed string to VAL. Return its previous 319 value. */ 320 321 const char * 322 set_random_seed (const char *val) 323 { 324 const char *old = flag_random_seed; 325 flag_random_seed = val; 326 return old; 327 } 328 329 /* Handler for fatal signals, such as SIGSEGV. These are transformed 330 into ICE messages, which is much more user friendly. In case the 331 error printer crashes, reset the signal to prevent infinite recursion. */ 332 333 static void 334 crash_signal (int signo) 335 { 336 signal (signo, SIG_DFL); 337 338 /* If we crashed while processing an ASM statement, then be a little more 339 graceful. It's most likely the user's fault. */ 340 if (this_is_asm_operands) 341 { 342 output_operand_lossage ("unrecoverable error"); 343 exit (FATAL_EXIT_CODE); 344 } 345 346 internal_error ("%s", strsignal (signo)); 347 } 348 349 /* A subroutine of wrapup_global_declarations. We've come to the end of 350 the compilation unit. All deferred variables should be undeferred, 351 and all incomplete decls should be finalized. */ 352 353 void 354 wrapup_global_declaration_1 (tree decl) 355 { 356 /* We're not deferring this any longer. Assignment is conditional to 357 avoid needlessly dirtying PCH pages. */ 358 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl), TS_DECL_WITH_VIS) 359 && DECL_DEFER_OUTPUT (decl) != 0) 360 DECL_DEFER_OUTPUT (decl) = 0; 361 362 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0) 363 lang_hooks.finish_incomplete_decl (decl); 364 } 365 366 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL 367 needs to be output. Return true if it is output. */ 368 369 bool 370 wrapup_global_declaration_2 (tree decl) 371 { 372 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl)) 373 return false; 374 375 /* Don't write out static consts, unless we still need them. 376 377 We also keep static consts if not optimizing (for debugging), 378 unless the user specified -fno-keep-static-consts. 379 ??? They might be better written into the debug information. 380 This is possible when using DWARF. 381 382 A language processor that wants static constants to be always 383 written out (even if it is not used) is responsible for 384 calling rest_of_decl_compilation itself. E.g. the C front-end 385 calls rest_of_decl_compilation from finish_decl. 386 One motivation for this is that is conventional in some 387 environments to write things like: 388 static const char rcsid[] = "... version string ..."; 389 intending to force the string to be in the executable. 390 391 A language processor that would prefer to have unneeded 392 static constants "optimized away" would just defer writing 393 them out until here. E.g. C++ does this, because static 394 constants are often defined in header files. 395 396 ??? A tempting alternative (for both C and C++) would be 397 to force a constant to be written if and only if it is 398 defined in a main file, as opposed to an include file. */ 399 400 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)) 401 { 402 struct varpool_node *node; 403 bool needed = true; 404 node = varpool_get_node (decl); 405 406 if (!node && flag_ltrans) 407 needed = false; 408 else if (node && node->finalized) 409 needed = false; 410 else if (node && node->alias) 411 needed = false; 412 else if (!cgraph_global_info_ready 413 && (TREE_USED (decl) 414 || TREE_USED (DECL_ASSEMBLER_NAME (decl)))) 415 /* needed */; 416 else if (node && node->needed) 417 /* needed */; 418 else if (DECL_COMDAT (decl)) 419 needed = false; 420 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl) 421 && (optimize || !flag_keep_static_consts 422 || DECL_ARTIFICIAL (decl))) 423 needed = false; 424 425 if (needed) 426 { 427 rest_of_decl_compilation (decl, 1, 1); 428 return true; 429 } 430 } 431 432 return false; 433 } 434 435 /* Do any final processing required for the declarations in VEC, of 436 which there are LEN. We write out inline functions and variables 437 that have been deferred until this point, but which are required. 438 Returns nonzero if anything was put out. */ 439 440 bool 441 wrapup_global_declarations (tree *vec, int len) 442 { 443 bool reconsider, output_something = false; 444 int i; 445 446 for (i = 0; i < len; i++) 447 wrapup_global_declaration_1 (vec[i]); 448 449 /* Now emit any global variables or functions that we have been 450 putting off. We need to loop in case one of the things emitted 451 here references another one which comes earlier in the list. */ 452 do 453 { 454 reconsider = false; 455 for (i = 0; i < len; i++) 456 reconsider |= wrapup_global_declaration_2 (vec[i]); 457 if (reconsider) 458 output_something = true; 459 } 460 while (reconsider); 461 462 return output_something; 463 } 464 465 /* A subroutine of check_global_declarations. Issue appropriate warnings 466 for the global declaration DECL. */ 467 468 void 469 check_global_declaration_1 (tree decl) 470 { 471 /* Warn about any function declared static but not defined. We don't 472 warn about variables, because many programs have static variables 473 that exist only to get some text into the object file. */ 474 if (TREE_CODE (decl) == FUNCTION_DECL 475 && DECL_INITIAL (decl) == 0 476 && DECL_EXTERNAL (decl) 477 && ! DECL_ARTIFICIAL (decl) 478 && ! TREE_NO_WARNING (decl) 479 && ! TREE_PUBLIC (decl) 480 && (warn_unused_function 481 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))) 482 { 483 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))) 484 pedwarn (input_location, 0, "%q+F used but never defined", decl); 485 else 486 warning (OPT_Wunused_function, "%q+F declared %<static%> but never defined", decl); 487 /* This symbol is effectively an "extern" declaration now. */ 488 TREE_PUBLIC (decl) = 1; 489 assemble_external (decl); 490 } 491 492 /* Warn about static fns or vars defined but not used. */ 493 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL) 494 /* We don't warn about "static const" variables because the 495 "rcs_id" idiom uses that construction. */ 496 || (warn_unused_variable 497 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl))) 498 && ! DECL_IN_SYSTEM_HEADER (decl) 499 && ! TREE_USED (decl) 500 /* The TREE_USED bit for file-scope decls is kept in the identifier, 501 to handle multiple external decls in different scopes. */ 502 && ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl))) 503 && ! DECL_EXTERNAL (decl) 504 && ! TREE_PUBLIC (decl) 505 /* A volatile variable might be used in some non-obvious way. */ 506 && ! TREE_THIS_VOLATILE (decl) 507 /* Global register variables must be declared to reserve them. */ 508 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl)) 509 /* Otherwise, ask the language. */ 510 && lang_hooks.decls.warn_unused_global (decl)) 511 warning ((TREE_CODE (decl) == FUNCTION_DECL) 512 ? OPT_Wunused_function 513 : OPT_Wunused_variable, 514 "%q+D defined but not used", decl); 515 } 516 517 /* Issue appropriate warnings for the global declarations in VEC (of 518 which there are LEN). */ 519 520 void 521 check_global_declarations (tree *vec, int len) 522 { 523 int i; 524 525 for (i = 0; i < len; i++) 526 check_global_declaration_1 (vec[i]); 527 } 528 529 /* Emit debugging information for all global declarations in VEC. */ 530 531 void 532 emit_debug_global_declarations (tree *vec, int len) 533 { 534 int i; 535 536 /* Avoid confusing the debug information machinery when there are errors. */ 537 if (seen_error ()) 538 return; 539 540 timevar_push (TV_SYMOUT); 541 for (i = 0; i < len; i++) 542 debug_hooks->global_decl (vec[i]); 543 timevar_pop (TV_SYMOUT); 544 } 545 546 /* Compile an entire translation unit. Write a file of assembly 547 output and various debugging dumps. */ 548 549 static void 550 compile_file (void) 551 { 552 timevar_start (TV_PHASE_PARSING); 553 timevar_push (TV_PARSE_GLOBAL); 554 555 /* Call the parser, which parses the entire file (calling 556 rest_of_compilation for each function). */ 557 lang_hooks.parse_file (); 558 559 timevar_pop (TV_PARSE_GLOBAL); 560 timevar_stop (TV_PHASE_PARSING); 561 562 /* Compilation is now finished except for writing 563 what's left of the symbol table output. */ 564 565 if (flag_syntax_only || flag_wpa) 566 return; 567 568 timevar_start (TV_PHASE_GENERATE); 569 570 ggc_protect_identifiers = false; 571 572 /* This must also call cgraph_finalize_compilation_unit. */ 573 lang_hooks.decls.final_write_globals (); 574 575 if (seen_error ()) 576 { 577 timevar_stop (TV_PHASE_GENERATE); 578 return; 579 } 580 581 /* Compilation unit is finalized. When producing non-fat LTO object, we are 582 basically finished. */ 583 if (in_lto_p || !flag_lto || flag_fat_lto_objects) 584 { 585 varpool_assemble_pending_decls (); 586 finish_aliases_2 (); 587 588 /* Likewise for mudflap static object registrations. */ 589 if (flag_mudflap) 590 mudflap_finish_file (); 591 592 output_shared_constant_pool (); 593 output_object_blocks (); 594 finish_tm_clone_pairs (); 595 596 /* Write out any pending weak symbol declarations. */ 597 weak_finish (); 598 599 /* This must be at the end before unwind and debug info. 600 Some target ports emit PIC setup thunks here. */ 601 targetm.asm_out.code_end (); 602 603 /* Do dbx symbols. */ 604 timevar_push (TV_SYMOUT); 605 606 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO 607 if (dwarf2out_do_frame ()) 608 dwarf2out_frame_finish (); 609 #endif 610 611 (*debug_hooks->finish) (main_input_filename); 612 timevar_pop (TV_SYMOUT); 613 614 /* Output some stuff at end of file if nec. */ 615 616 dw2_output_indirect_constants (); 617 618 /* Flush any pending external directives. */ 619 process_pending_assemble_externals (); 620 } 621 622 /* Emit LTO marker if LTO info has been previously emitted. This is 623 used by collect2 to determine whether an object file contains IL. 624 We used to emit an undefined reference here, but this produces 625 link errors if an object file with IL is stored into a shared 626 library without invoking lto1. */ 627 if (flag_generate_lto) 628 { 629 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON 630 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE, 631 "__gnu_lto_v1", 632 (unsigned HOST_WIDE_INT) 1, 8); 633 #elif defined ASM_OUTPUT_ALIGNED_COMMON 634 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_v1", 635 (unsigned HOST_WIDE_INT) 1, 8); 636 #else 637 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_v1", 638 (unsigned HOST_WIDE_INT) 1, 639 (unsigned HOST_WIDE_INT) 1); 640 #endif 641 /* Let linker plugin know that this is a slim object and must be LTOed 642 even when user did not ask for it. */ 643 if (!flag_fat_lto_objects) 644 { 645 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON 646 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE, 647 "__gnu_lto_slim", 648 (unsigned HOST_WIDE_INT) 1, 8); 649 #elif defined ASM_OUTPUT_ALIGNED_COMMON 650 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_slim", 651 (unsigned HOST_WIDE_INT) 1, 8); 652 #else 653 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_slim", 654 (unsigned HOST_WIDE_INT) 1, 655 (unsigned HOST_WIDE_INT) 1); 656 #endif 657 } 658 } 659 660 /* Attach a special .ident directive to the end of the file to identify 661 the version of GCC which compiled this code. The format of the .ident 662 string is patterned after the ones produced by native SVR4 compilers. */ 663 #ifdef IDENT_ASM_OP 664 if (!flag_no_ident) 665 { 666 const char *pkg_version = "(GNU) "; 667 668 if (strcmp ("(GCC) ", pkgversion_string)) 669 pkg_version = pkgversion_string; 670 fprintf (asm_out_file, "%s\"GCC: %s%s\"\n", 671 IDENT_ASM_OP, pkg_version, version_string); 672 } 673 #endif 674 675 /* Invoke registered plugin callbacks. */ 676 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT, NULL); 677 678 /* This must be at the end. Some target ports emit end of file directives 679 into the assembly file here, and hence we can not output anything to the 680 assembly file after this point. */ 681 targetm.asm_out.file_end (); 682 683 timevar_stop (TV_PHASE_GENERATE); 684 } 685 686 /* Print version information to FILE. 687 Each line begins with INDENT (for the case where FILE is the 688 assembler output file). */ 689 690 void 691 print_version (FILE *file, const char *indent) 692 { 693 static const char fmt1[] = 694 #ifdef __GNUC__ 695 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ") 696 #else 697 N_("%s%s%s %sversion %s (%s) compiled by CC, ") 698 #endif 699 ; 700 static const char fmt2[] = 701 N_("GMP version %s, MPFR version %s, MPC version %s\n"); 702 static const char fmt3[] = 703 N_("%s%swarning: %s header version %s differs from library version %s.\n"); 704 static const char fmt4[] = 705 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n"); 706 #ifndef __VERSION__ 707 #define __VERSION__ "[?]" 708 #endif 709 fprintf (file, 710 file == stderr ? _(fmt1) : fmt1, 711 indent, *indent != 0 ? " " : "", 712 lang_hooks.name, pkgversion_string, version_string, TARGET_NAME, 713 indent, __VERSION__); 714 715 /* We need to stringify the GMP macro values. Ugh, gmp_version has 716 two string formats, "i.j.k" and "i.j" when k is zero. As of 717 gmp-4.3.0, GMP always uses the 3 number format. */ 718 #define GCC_GMP_STRINGIFY_VERSION3(X) #X 719 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3(X) 720 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z)) 721 #define GCC_GMP_VERSION \ 722 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL) 723 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0 724 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \ 725 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) 726 #else 727 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \ 728 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) "." \ 729 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_PATCHLEVEL) 730 #endif 731 fprintf (file, 732 file == stderr ? _(fmt2) : fmt2, 733 GCC_GMP_STRINGIFY_VERSION, MPFR_VERSION_STRING, MPC_VERSION_STRING); 734 if (strcmp (GCC_GMP_STRINGIFY_VERSION, gmp_version)) 735 fprintf (file, 736 file == stderr ? _(fmt3) : fmt3, 737 indent, *indent != 0 ? " " : "", 738 "GMP", GCC_GMP_STRINGIFY_VERSION, gmp_version); 739 if (strcmp (MPFR_VERSION_STRING, mpfr_get_version ())) 740 fprintf (file, 741 file == stderr ? _(fmt3) : fmt3, 742 indent, *indent != 0 ? " " : "", 743 "MPFR", MPFR_VERSION_STRING, mpfr_get_version ()); 744 if (strcmp (MPC_VERSION_STRING, mpc_get_version ())) 745 fprintf (file, 746 file == stderr ? _(fmt3) : fmt3, 747 indent, *indent != 0 ? " " : "", 748 "MPC", MPC_VERSION_STRING, mpc_get_version ()); 749 fprintf (file, 750 file == stderr ? _(fmt4) : fmt4, 751 indent, *indent != 0 ? " " : "", 752 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE)); 753 754 print_plugins_versions (file, indent); 755 } 756 757 static int 758 print_to_asm_out_file (print_switch_type type, const char * text) 759 { 760 bool prepend_sep = true; 761 762 switch (type) 763 { 764 case SWITCH_TYPE_LINE_END: 765 putc ('\n', asm_out_file); 766 return 1; 767 768 case SWITCH_TYPE_LINE_START: 769 fputs (ASM_COMMENT_START, asm_out_file); 770 return strlen (ASM_COMMENT_START); 771 772 case SWITCH_TYPE_DESCRIPTIVE: 773 if (ASM_COMMENT_START[0] == 0) 774 prepend_sep = false; 775 /* Drop through. */ 776 case SWITCH_TYPE_PASSED: 777 case SWITCH_TYPE_ENABLED: 778 if (prepend_sep) 779 fputc (' ', asm_out_file); 780 fputs (text, asm_out_file); 781 /* No need to return the length here as 782 print_single_switch has already done it. */ 783 return 0; 784 785 default: 786 return -1; 787 } 788 } 789 790 static int 791 print_to_stderr (print_switch_type type, const char * text) 792 { 793 switch (type) 794 { 795 case SWITCH_TYPE_LINE_END: 796 putc ('\n', stderr); 797 return 1; 798 799 case SWITCH_TYPE_LINE_START: 800 return 0; 801 802 case SWITCH_TYPE_PASSED: 803 case SWITCH_TYPE_ENABLED: 804 fputc (' ', stderr); 805 /* Drop through. */ 806 807 case SWITCH_TYPE_DESCRIPTIVE: 808 fputs (text, stderr); 809 /* No need to return the length here as 810 print_single_switch has already done it. */ 811 return 0; 812 813 default: 814 return -1; 815 } 816 } 817 818 /* Print an option value and return the adjusted position in the line. 819 ??? print_fn doesn't handle errors, eg disk full; presumably other 820 code will catch a disk full though. */ 821 822 static int 823 print_single_switch (print_switch_fn_type print_fn, 824 int pos, 825 print_switch_type type, 826 const char * text) 827 { 828 /* The ultrix fprintf returns 0 on success, so compute the result 829 we want here since we need it for the following test. The +1 830 is for the separator character that will probably be emitted. */ 831 int len = strlen (text) + 1; 832 833 if (pos != 0 834 && pos + len > MAX_LINE) 835 { 836 print_fn (SWITCH_TYPE_LINE_END, NULL); 837 pos = 0; 838 } 839 840 if (pos == 0) 841 pos += print_fn (SWITCH_TYPE_LINE_START, NULL); 842 843 print_fn (type, text); 844 return pos + len; 845 } 846 847 /* Print active target switches using PRINT_FN. 848 POS is the current cursor position and MAX is the size of a "line". 849 Each line begins with INDENT and ends with TERM. 850 Each switch is separated from the next by SEP. */ 851 852 static void 853 print_switch_values (print_switch_fn_type print_fn) 854 { 855 int pos = 0; 856 size_t j; 857 858 /* Fill in the -frandom-seed option, if the user didn't pass it, so 859 that it can be printed below. This helps reproducibility. */ 860 if (!flag_random_seed) 861 init_random_seed (); 862 863 /* Print the options as passed. */ 864 pos = print_single_switch (print_fn, pos, 865 SWITCH_TYPE_DESCRIPTIVE, _("options passed: ")); 866 867 for (j = 1; j < save_decoded_options_count; j++) 868 { 869 switch (save_decoded_options[j].opt_index) 870 { 871 case OPT_o: 872 case OPT_d: 873 case OPT_dumpbase: 874 case OPT_dumpdir: 875 case OPT_auxbase: 876 case OPT_quiet: 877 case OPT_version: 878 /* Ignore these. */ 879 continue; 880 } 881 882 pos = print_single_switch (print_fn, pos, SWITCH_TYPE_PASSED, 883 save_decoded_options[j].orig_option_with_args_text); 884 } 885 886 if (pos > 0) 887 print_fn (SWITCH_TYPE_LINE_END, NULL); 888 889 /* Print the -f and -m options that have been enabled. 890 We don't handle language specific options but printing argv 891 should suffice. */ 892 pos = print_single_switch (print_fn, 0, 893 SWITCH_TYPE_DESCRIPTIVE, _("options enabled: ")); 894 895 for (j = 0; j < cl_options_count; j++) 896 if (cl_options[j].cl_report 897 && option_enabled (j, &global_options) > 0) 898 pos = print_single_switch (print_fn, pos, 899 SWITCH_TYPE_ENABLED, cl_options[j].opt_text); 900 901 print_fn (SWITCH_TYPE_LINE_END, NULL); 902 } 903 904 /* Open assembly code output file. Do this even if -fsyntax-only is 905 on, because then the driver will have provided the name of a 906 temporary file or bit bucket for us. NAME is the file specified on 907 the command line, possibly NULL. */ 908 static void 909 init_asm_output (const char *name) 910 { 911 if (name == NULL && asm_file_name == 0) 912 asm_out_file = stdout; 913 else 914 { 915 if (asm_file_name == 0) 916 { 917 int len = strlen (dump_base_name); 918 char *dumpname = XNEWVEC (char, len + 6); 919 920 memcpy (dumpname, dump_base_name, len + 1); 921 strip_off_ending (dumpname, len); 922 strcat (dumpname, ".s"); 923 asm_file_name = dumpname; 924 } 925 if (!strcmp (asm_file_name, "-")) 926 asm_out_file = stdout; 927 else 928 asm_out_file = fopen (asm_file_name, "w+b"); 929 if (asm_out_file == 0) 930 fatal_error ("can%'t open %s for writing: %m", asm_file_name); 931 } 932 933 if (!flag_syntax_only) 934 { 935 targetm.asm_out.file_start (); 936 937 if (flag_record_gcc_switches) 938 { 939 if (targetm.asm_out.record_gcc_switches) 940 { 941 /* Let the target know that we are about to start recording. */ 942 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE, 943 NULL); 944 /* Now record the switches. */ 945 print_switch_values (targetm.asm_out.record_gcc_switches); 946 /* Let the target know that the recording is over. */ 947 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE, 948 NULL); 949 } 950 else 951 inform (input_location, "-frecord-gcc-switches is not supported by the current target"); 952 } 953 954 if (flag_verbose_asm) 955 { 956 /* Print the list of switches in effect 957 into the assembler file as comments. */ 958 print_version (asm_out_file, ASM_COMMENT_START); 959 print_switch_values (print_to_asm_out_file); 960 putc ('\n', asm_out_file); 961 } 962 } 963 } 964 965 /* Default tree printer. Handles declarations only. */ 966 bool 967 default_tree_printer (pretty_printer *pp, text_info *text, const char *spec, 968 int precision, bool wide, bool set_locus, bool hash) 969 { 970 tree t; 971 972 /* FUTURE: %+x should set the locus. */ 973 if (precision != 0 || wide || hash) 974 return false; 975 976 switch (*spec) 977 { 978 case 'E': 979 t = va_arg (*text->args_ptr, tree); 980 if (TREE_CODE (t) == IDENTIFIER_NODE) 981 { 982 pp_identifier (pp, IDENTIFIER_POINTER (t)); 983 return true; 984 } 985 break; 986 987 case 'D': 988 t = va_arg (*text->args_ptr, tree); 989 if (DECL_DEBUG_EXPR_IS_FROM (t) && DECL_DEBUG_EXPR (t)) 990 t = DECL_DEBUG_EXPR (t); 991 break; 992 993 case 'F': 994 case 'T': 995 t = va_arg (*text->args_ptr, tree); 996 break; 997 998 case 'K': 999 percent_K_format (text); 1000 return true; 1001 1002 default: 1003 return false; 1004 } 1005 1006 if (set_locus && text->locus) 1007 *text->locus = DECL_SOURCE_LOCATION (t); 1008 1009 if (DECL_P (t)) 1010 { 1011 const char *n = DECL_NAME (t) 1012 ? identifier_to_locale (lang_hooks.decl_printable_name (t, 2)) 1013 : _("<anonymous>"); 1014 pp_string (pp, n); 1015 } 1016 else 1017 dump_generic_node (pp, t, 0, TDF_DIAGNOSTIC, 0); 1018 1019 return true; 1020 } 1021 1022 /* A helper function; used as the reallocator function for cpp's line 1023 table. */ 1024 static void * 1025 realloc_for_line_map (void *ptr, size_t len) 1026 { 1027 return GGC_RESIZEVAR (void, ptr, len); 1028 } 1029 1030 /* A helper function: used as the allocator function for 1031 identifier_to_locale. */ 1032 static void * 1033 alloc_for_identifier_to_locale (size_t len) 1034 { 1035 return ggc_alloc_atomic (len); 1036 } 1037 1038 /* Output stack usage information. */ 1039 void 1040 output_stack_usage (void) 1041 { 1042 static bool warning_issued = false; 1043 enum stack_usage_kind_type { STATIC = 0, DYNAMIC, DYNAMIC_BOUNDED }; 1044 const char *stack_usage_kind_str[] = { 1045 "static", 1046 "dynamic", 1047 "dynamic,bounded" 1048 }; 1049 HOST_WIDE_INT stack_usage = current_function_static_stack_size; 1050 enum stack_usage_kind_type stack_usage_kind; 1051 1052 if (stack_usage < 0) 1053 { 1054 if (!warning_issued) 1055 { 1056 warning (0, "stack usage computation not supported for this target"); 1057 warning_issued = true; 1058 } 1059 return; 1060 } 1061 1062 stack_usage_kind = STATIC; 1063 1064 /* Add the maximum amount of space pushed onto the stack. */ 1065 if (current_function_pushed_stack_size > 0) 1066 { 1067 stack_usage += current_function_pushed_stack_size; 1068 stack_usage_kind = DYNAMIC_BOUNDED; 1069 } 1070 1071 /* Now on to the tricky part: dynamic stack allocation. */ 1072 if (current_function_allocates_dynamic_stack_space) 1073 { 1074 if (current_function_has_unbounded_dynamic_stack_size) 1075 stack_usage_kind = DYNAMIC; 1076 else 1077 stack_usage_kind = DYNAMIC_BOUNDED; 1078 1079 /* Add the size even in the unbounded case, this can't hurt. */ 1080 stack_usage += current_function_dynamic_stack_size; 1081 } 1082 1083 if (flag_stack_usage) 1084 { 1085 expanded_location loc 1086 = expand_location (DECL_SOURCE_LOCATION (current_function_decl)); 1087 const char *raw_id, *id; 1088 1089 /* Strip the scope prefix if any. */ 1090 raw_id = lang_hooks.decl_printable_name (current_function_decl, 2); 1091 id = strrchr (raw_id, '.'); 1092 if (id) 1093 id++; 1094 else 1095 id = raw_id; 1096 1097 fprintf (stack_usage_file, 1098 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC"\t%s\n", 1099 lbasename (loc.file), 1100 loc.line, 1101 loc.column, 1102 id, 1103 stack_usage, 1104 stack_usage_kind_str[stack_usage_kind]); 1105 } 1106 1107 if (warn_stack_usage >= 0) 1108 { 1109 if (stack_usage_kind == DYNAMIC) 1110 warning (OPT_Wstack_usage_, "stack usage might be unbounded"); 1111 else if (stack_usage > warn_stack_usage) 1112 { 1113 if (stack_usage_kind == DYNAMIC_BOUNDED) 1114 warning (OPT_Wstack_usage_, "stack usage might be %wd bytes", 1115 stack_usage); 1116 else 1117 warning (OPT_Wstack_usage_, "stack usage is %wd bytes", 1118 stack_usage); 1119 } 1120 } 1121 } 1122 1123 /* Open an auxiliary output file. */ 1124 static FILE * 1125 open_auxiliary_file (const char *ext) 1126 { 1127 char *filename; 1128 FILE *file; 1129 1130 filename = concat (aux_base_name, ".", ext, NULL); 1131 file = fopen (filename, "w"); 1132 if (!file) 1133 fatal_error ("can%'t open %s for writing: %m", filename); 1134 free (filename); 1135 return file; 1136 } 1137 1138 /* Initialization of the front end environment, before command line 1139 options are parsed. Signal handlers, internationalization etc. 1140 ARGV0 is main's argv[0]. */ 1141 static void 1142 general_init (const char *argv0) 1143 { 1144 const char *p; 1145 1146 p = argv0 + strlen (argv0); 1147 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1])) 1148 --p; 1149 progname = p; 1150 1151 xmalloc_set_program_name (progname); 1152 1153 hex_init (); 1154 1155 /* Unlock the stdio streams. */ 1156 unlock_std_streams (); 1157 1158 gcc_init_libintl (); 1159 1160 identifier_to_locale_alloc = alloc_for_identifier_to_locale; 1161 identifier_to_locale_free = ggc_free; 1162 1163 /* Initialize the diagnostics reporting machinery, so option parsing 1164 can give warnings and errors. */ 1165 diagnostic_initialize (global_dc, N_OPTS); 1166 diagnostic_starter (global_dc) = default_tree_diagnostic_starter; 1167 /* By default print macro expansion contexts in the diagnostic 1168 finalizer -- for tokens resulting from macro macro expansion. */ 1169 diagnostic_finalizer (global_dc) = virt_loc_aware_diagnostic_finalizer; 1170 /* Set a default printer. Language specific initializations will 1171 override it later. */ 1172 pp_format_decoder (global_dc->printer) = &default_tree_printer; 1173 global_dc->show_option_requested 1174 = global_options_init.x_flag_diagnostics_show_option; 1175 global_dc->show_column 1176 = global_options_init.x_flag_show_column; 1177 global_dc->internal_error = plugins_internal_error_function; 1178 global_dc->option_enabled = option_enabled; 1179 global_dc->option_state = &global_options; 1180 global_dc->option_name = option_name; 1181 1182 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */ 1183 #ifdef SIGSEGV 1184 signal (SIGSEGV, crash_signal); 1185 #endif 1186 #ifdef SIGILL 1187 signal (SIGILL, crash_signal); 1188 #endif 1189 #ifdef SIGBUS 1190 signal (SIGBUS, crash_signal); 1191 #endif 1192 #ifdef SIGABRT 1193 signal (SIGABRT, crash_signal); 1194 #endif 1195 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT) 1196 signal (SIGIOT, crash_signal); 1197 #endif 1198 #ifdef SIGFPE 1199 signal (SIGFPE, crash_signal); 1200 #endif 1201 1202 /* Other host-specific signal setup. */ 1203 (*host_hooks.extra_signals)(); 1204 1205 /* Initialize the garbage-collector, string pools and tree type hash 1206 table. */ 1207 init_ggc (); 1208 init_stringpool (); 1209 line_table = ggc_alloc_line_maps (); 1210 linemap_init (line_table); 1211 line_table->reallocator = realloc_for_line_map; 1212 line_table->round_alloc_size = ggc_round_alloc_size; 1213 init_ttree (); 1214 1215 /* Initialize register usage now so switches may override. */ 1216 init_reg_sets (); 1217 1218 /* Register the language-independent parameters. */ 1219 global_init_params (); 1220 1221 /* This must be done after global_init_params but before argument 1222 processing. */ 1223 init_ggc_heuristics(); 1224 init_optimization_passes (); 1225 statistics_early_init (); 1226 finish_params (); 1227 } 1228 1229 /* Return true if the current target supports -fsection-anchors. */ 1230 1231 static bool 1232 target_supports_section_anchors_p (void) 1233 { 1234 if (targetm.min_anchor_offset == 0 && targetm.max_anchor_offset == 0) 1235 return false; 1236 1237 if (targetm.asm_out.output_anchor == NULL) 1238 return false; 1239 1240 return true; 1241 } 1242 1243 /* Default the align_* variables to 1 if they're still unset, and 1244 set up the align_*_log variables. */ 1245 static void 1246 init_alignments (void) 1247 { 1248 if (align_loops <= 0) 1249 align_loops = 1; 1250 if (align_loops_max_skip > align_loops) 1251 align_loops_max_skip = align_loops - 1; 1252 align_loops_log = floor_log2 (align_loops * 2 - 1); 1253 if (align_jumps <= 0) 1254 align_jumps = 1; 1255 if (align_jumps_max_skip > align_jumps) 1256 align_jumps_max_skip = align_jumps - 1; 1257 align_jumps_log = floor_log2 (align_jumps * 2 - 1); 1258 if (align_labels <= 0) 1259 align_labels = 1; 1260 align_labels_log = floor_log2 (align_labels * 2 - 1); 1261 if (align_labels_max_skip > align_labels) 1262 align_labels_max_skip = align_labels - 1; 1263 if (align_functions <= 0) 1264 align_functions = 1; 1265 align_functions_log = floor_log2 (align_functions * 2 - 1); 1266 } 1267 1268 /* Process the options that have been parsed. */ 1269 static void 1270 process_options (void) 1271 { 1272 /* Just in case lang_hooks.post_options ends up calling a debug_hook. 1273 This can happen with incorrect pre-processed input. */ 1274 debug_hooks = &do_nothing_debug_hooks; 1275 1276 maximum_field_alignment = initial_max_fld_align * BITS_PER_UNIT; 1277 1278 /* Allow the front end to perform consistency checks and do further 1279 initialization based on the command line options. This hook also 1280 sets the original filename if appropriate (e.g. foo.i -> foo.c) 1281 so we can correctly initialize debug output. */ 1282 no_backend = lang_hooks.post_options (&main_input_filename); 1283 1284 /* Some machines may reject certain combinations of options. */ 1285 targetm.target_option.override (); 1286 1287 /* Avoid any informative notes in the second run of -fcompare-debug. */ 1288 if (flag_compare_debug) 1289 diagnostic_inhibit_notes (global_dc); 1290 1291 if (flag_section_anchors && !target_supports_section_anchors_p ()) 1292 { 1293 warning (OPT_fsection_anchors, 1294 "this target does not support %qs", "-fsection-anchors"); 1295 flag_section_anchors = 0; 1296 } 1297 1298 if (flag_short_enums == 2) 1299 flag_short_enums = targetm.default_short_enums (); 1300 1301 /* Set aux_base_name if not already set. */ 1302 if (aux_base_name) 1303 ; 1304 else if (main_input_filename) 1305 { 1306 char *name = xstrdup (lbasename (main_input_filename)); 1307 1308 strip_off_ending (name, strlen (name)); 1309 aux_base_name = name; 1310 } 1311 else 1312 aux_base_name = "gccaux"; 1313 1314 #ifndef HAVE_cloog 1315 if (flag_graphite 1316 || flag_graphite_identity 1317 || flag_loop_block 1318 || flag_loop_flatten 1319 || flag_loop_interchange 1320 || flag_loop_strip_mine 1321 || flag_loop_parallelize_all) 1322 sorry ("Graphite loop optimizations cannot be used (-fgraphite, " 1323 "-fgraphite-identity, -floop-block, -floop-flatten, " 1324 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, " 1325 "and -ftree-loop-linear)"); 1326 #endif 1327 1328 if (flag_mudflap && flag_lto) 1329 sorry ("mudflap cannot be used together with link-time optimization"); 1330 1331 /* One region RA really helps to decrease the code size. */ 1332 if (flag_ira_region == IRA_REGION_AUTODETECT) 1333 flag_ira_region 1334 = optimize_size || !optimize ? IRA_REGION_ONE : IRA_REGION_MIXED; 1335 1336 if (flag_strict_volatile_bitfields > 0 && !abi_version_at_least (2)) 1337 { 1338 warning (0, "-fstrict-volatile-bitfields disabled; " 1339 "it is incompatible with ABI versions < 2"); 1340 flag_strict_volatile_bitfields = 0; 1341 } 1342 1343 /* Unrolling all loops implies that standard loop unrolling must also 1344 be done. */ 1345 if (flag_unroll_all_loops) 1346 flag_unroll_loops = 1; 1347 1348 /* web and rename-registers help when run after loop unrolling. */ 1349 if (flag_web == AUTODETECT_VALUE) 1350 flag_web = flag_unroll_loops || flag_peel_loops; 1351 1352 if (flag_rename_registers == AUTODETECT_VALUE) 1353 flag_rename_registers = flag_unroll_loops || flag_peel_loops; 1354 1355 if (flag_non_call_exceptions) 1356 flag_asynchronous_unwind_tables = 1; 1357 if (flag_asynchronous_unwind_tables) 1358 flag_unwind_tables = 1; 1359 1360 if (flag_value_profile_transformations) 1361 flag_profile_values = 1; 1362 1363 /* Warn about options that are not supported on this machine. */ 1364 #ifndef INSN_SCHEDULING 1365 if (flag_schedule_insns || flag_schedule_insns_after_reload) 1366 warning (0, "instruction scheduling not supported on this target machine"); 1367 #endif 1368 #ifndef DELAY_SLOTS 1369 if (flag_delayed_branch) 1370 warning (0, "this target machine does not have delayed branches"); 1371 #endif 1372 1373 user_label_prefix = USER_LABEL_PREFIX; 1374 if (flag_leading_underscore != -1) 1375 { 1376 /* If the default prefix is more complicated than "" or "_", 1377 issue a warning and ignore this option. */ 1378 if (user_label_prefix[0] == 0 || 1379 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0)) 1380 { 1381 user_label_prefix = flag_leading_underscore ? "_" : ""; 1382 } 1383 else 1384 warning (0, "-f%sleading-underscore not supported on this target machine", 1385 flag_leading_underscore ? "" : "no-"); 1386 } 1387 1388 /* If we are in verbose mode, write out the version and maybe all the 1389 option flags in use. */ 1390 if (version_flag) 1391 { 1392 print_version (stderr, ""); 1393 if (! quiet_flag) 1394 print_switch_values (print_to_stderr); 1395 } 1396 1397 if (flag_syntax_only) 1398 { 1399 write_symbols = NO_DEBUG; 1400 profile_flag = 0; 1401 } 1402 1403 if (flag_gtoggle) 1404 { 1405 if (debug_info_level == DINFO_LEVEL_NONE) 1406 { 1407 debug_info_level = DINFO_LEVEL_NORMAL; 1408 1409 if (write_symbols == NO_DEBUG) 1410 write_symbols = PREFERRED_DEBUGGING_TYPE; 1411 } 1412 else 1413 debug_info_level = DINFO_LEVEL_NONE; 1414 } 1415 1416 if (flag_dump_final_insns && !flag_syntax_only && !no_backend) 1417 { 1418 FILE *final_output = fopen (flag_dump_final_insns, "w"); 1419 if (!final_output) 1420 { 1421 error ("could not open final insn dump file %qs: %m", 1422 flag_dump_final_insns); 1423 flag_dump_final_insns = NULL; 1424 } 1425 else if (fclose (final_output)) 1426 { 1427 error ("could not close zeroed insn dump file %qs: %m", 1428 flag_dump_final_insns); 1429 flag_dump_final_insns = NULL; 1430 } 1431 } 1432 1433 /* Unless over-ridden for the target, assume that all DWARF levels 1434 may be emitted, if DWARF2_DEBUG is selected. */ 1435 if (dwarf_strict < 0) 1436 dwarf_strict = 0; 1437 1438 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging 1439 level is 0. */ 1440 if (debug_info_level == DINFO_LEVEL_NONE) 1441 write_symbols = NO_DEBUG; 1442 1443 if (write_symbols == NO_DEBUG) 1444 ; 1445 #if defined(DBX_DEBUGGING_INFO) 1446 else if (write_symbols == DBX_DEBUG) 1447 debug_hooks = &dbx_debug_hooks; 1448 #endif 1449 #if defined(XCOFF_DEBUGGING_INFO) 1450 else if (write_symbols == XCOFF_DEBUG) 1451 debug_hooks = &xcoff_debug_hooks; 1452 #endif 1453 #ifdef SDB_DEBUGGING_INFO 1454 else if (write_symbols == SDB_DEBUG) 1455 debug_hooks = &sdb_debug_hooks; 1456 #endif 1457 #ifdef DWARF2_DEBUGGING_INFO 1458 else if (write_symbols == DWARF2_DEBUG) 1459 debug_hooks = &dwarf2_debug_hooks; 1460 #endif 1461 #ifdef VMS_DEBUGGING_INFO 1462 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG) 1463 debug_hooks = &vmsdbg_debug_hooks; 1464 #endif 1465 else 1466 error ("target system does not support the \"%s\" debug format", 1467 debug_type_names[write_symbols]); 1468 1469 /* We know which debug output will be used so we can set flag_var_tracking 1470 and flag_var_tracking_uninit if the user has not specified them. */ 1471 if (debug_info_level < DINFO_LEVEL_NORMAL 1472 || debug_hooks->var_location == do_nothing_debug_hooks.var_location) 1473 { 1474 if (flag_var_tracking == 1 1475 || flag_var_tracking_uninit == 1) 1476 { 1477 if (debug_info_level < DINFO_LEVEL_NORMAL) 1478 warning (0, "variable tracking requested, but useless unless " 1479 "producing debug info"); 1480 else 1481 warning (0, "variable tracking requested, but not supported " 1482 "by this debug format"); 1483 } 1484 flag_var_tracking = 0; 1485 flag_var_tracking_uninit = 0; 1486 } 1487 1488 /* The debug hooks are used to implement -fdump-go-spec because it 1489 gives a simple and stable API for all the information we need to 1490 dump. */ 1491 if (flag_dump_go_spec != NULL) 1492 debug_hooks = dump_go_spec_init (flag_dump_go_spec, debug_hooks); 1493 1494 /* If the user specifically requested variable tracking with tagging 1495 uninitialized variables, we need to turn on variable tracking. 1496 (We already determined above that variable tracking is feasible.) */ 1497 if (flag_var_tracking_uninit == 1) 1498 flag_var_tracking = 1; 1499 1500 if (flag_var_tracking == AUTODETECT_VALUE) 1501 flag_var_tracking = optimize >= 1; 1502 1503 if (flag_var_tracking_uninit == AUTODETECT_VALUE) 1504 flag_var_tracking_uninit = flag_var_tracking; 1505 1506 if (flag_var_tracking_assignments == AUTODETECT_VALUE) 1507 flag_var_tracking_assignments = flag_var_tracking 1508 && !(flag_selective_scheduling || flag_selective_scheduling2); 1509 1510 if (flag_var_tracking_assignments_toggle) 1511 flag_var_tracking_assignments = !flag_var_tracking_assignments; 1512 1513 if (flag_var_tracking_assignments && !flag_var_tracking) 1514 flag_var_tracking = flag_var_tracking_assignments = -1; 1515 1516 if (flag_var_tracking_assignments 1517 && (flag_selective_scheduling || flag_selective_scheduling2)) 1518 warning (0, "var-tracking-assignments changes selective scheduling"); 1519 1520 if (flag_tree_cselim == AUTODETECT_VALUE) 1521 #ifdef HAVE_conditional_move 1522 flag_tree_cselim = 1; 1523 #else 1524 flag_tree_cselim = 0; 1525 #endif 1526 1527 /* If auxiliary info generation is desired, open the output file. 1528 This goes in the same directory as the source file--unlike 1529 all the other output files. */ 1530 if (flag_gen_aux_info) 1531 { 1532 aux_info_file = fopen (aux_info_file_name, "w"); 1533 if (aux_info_file == 0) 1534 fatal_error ("can%'t open %s: %m", aux_info_file_name); 1535 } 1536 1537 if (!targetm_common.have_named_sections) 1538 { 1539 if (flag_function_sections) 1540 { 1541 warning (0, "-ffunction-sections not supported for this target"); 1542 flag_function_sections = 0; 1543 } 1544 if (flag_data_sections) 1545 { 1546 warning (0, "-fdata-sections not supported for this target"); 1547 flag_data_sections = 0; 1548 } 1549 } 1550 1551 if (flag_function_sections && profile_flag) 1552 { 1553 warning (0, "-ffunction-sections disabled; it makes profiling impossible"); 1554 flag_function_sections = 0; 1555 } 1556 1557 #ifndef HAVE_prefetch 1558 if (flag_prefetch_loop_arrays > 0) 1559 { 1560 warning (0, "-fprefetch-loop-arrays not supported for this target"); 1561 flag_prefetch_loop_arrays = 0; 1562 } 1563 #else 1564 if (flag_prefetch_loop_arrays > 0 && !HAVE_prefetch) 1565 { 1566 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)"); 1567 flag_prefetch_loop_arrays = 0; 1568 } 1569 #endif 1570 1571 /* This combination of options isn't handled for i386 targets and doesn't 1572 make much sense anyway, so don't allow it. */ 1573 if (flag_prefetch_loop_arrays > 0 && optimize_size) 1574 { 1575 warning (0, "-fprefetch-loop-arrays is not supported with -Os"); 1576 flag_prefetch_loop_arrays = 0; 1577 } 1578 1579 /* The presence of IEEE signaling NaNs, implies all math can trap. */ 1580 if (flag_signaling_nans) 1581 flag_trapping_math = 1; 1582 1583 /* We cannot reassociate if we want traps or signed zeros. */ 1584 if (flag_associative_math && (flag_trapping_math || flag_signed_zeros)) 1585 { 1586 warning (0, "-fassociative-math disabled; other options take precedence"); 1587 flag_associative_math = 0; 1588 } 1589 1590 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */ 1591 if (flag_cx_limited_range) 1592 flag_complex_method = 0; 1593 1594 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */ 1595 if (flag_cx_fortran_rules) 1596 flag_complex_method = 1; 1597 1598 /* Targets must be able to place spill slots at lower addresses. If the 1599 target already uses a soft frame pointer, the transition is trivial. */ 1600 if (!FRAME_GROWS_DOWNWARD && flag_stack_protect) 1601 { 1602 warning (0, "-fstack-protector not supported for this target"); 1603 flag_stack_protect = 0; 1604 } 1605 if (!flag_stack_protect) 1606 warn_stack_protect = 0; 1607 1608 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error 1609 have not been set. */ 1610 if (!global_options_set.x_warnings_are_errors 1611 && warn_coverage_mismatch 1612 && (global_dc->classify_diagnostic[OPT_Wcoverage_mismatch] == 1613 DK_UNSPECIFIED)) 1614 diagnostic_classify_diagnostic (global_dc, OPT_Wcoverage_mismatch, 1615 DK_ERROR, UNKNOWN_LOCATION); 1616 1617 /* Save the current optimization options. */ 1618 optimization_default_node = build_optimization_node (); 1619 optimization_current_node = optimization_default_node; 1620 } 1621 1622 /* This function can be called multiple times to reinitialize the compiler 1623 back end when register classes or instruction sets have changed, 1624 before each function. */ 1625 static void 1626 backend_init_target (void) 1627 { 1628 /* Initialize alignment variables. */ 1629 init_alignments (); 1630 1631 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target() 1632 to initialize reg_raw_mode[]. */ 1633 init_emit_regs (); 1634 1635 /* This invokes target hooks to set fixed_reg[] etc, which is 1636 mode-dependent. */ 1637 init_regs (); 1638 1639 /* This depends on stack_pointer_rtx. */ 1640 init_fake_stack_mems (); 1641 1642 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is 1643 mode-dependent. */ 1644 init_alias_target (); 1645 1646 /* Depends on HARD_FRAME_POINTER_REGNUM. */ 1647 init_reload (); 1648 1649 /* The following initialization functions need to generate rtl, so 1650 provide a dummy function context for them. */ 1651 init_dummy_function_start (); 1652 1653 /* rtx_cost is mode-dependent, so cached values need to be recomputed 1654 on a mode change. */ 1655 init_expmed (); 1656 1657 /* We may need to recompute regno_save_code[] and regno_restore_code[] 1658 after a mode change as well. */ 1659 caller_save_initialized_p = false; 1660 1661 expand_dummy_function_end (); 1662 } 1663 1664 /* Initialize the compiler back end. This function is called only once, 1665 when starting the compiler. */ 1666 static void 1667 backend_init (void) 1668 { 1669 init_emit_once (); 1670 1671 init_rtlanal (); 1672 init_inline_once (); 1673 init_varasm_once (); 1674 save_register_info (); 1675 1676 /* Initialize the target-specific back end pieces. */ 1677 ira_init_once (); 1678 backend_init_target (); 1679 } 1680 1681 /* Initialize excess precision settings. */ 1682 static void 1683 init_excess_precision (void) 1684 { 1685 /* Adjust excess precision handling based on the target options. If 1686 the front end cannot handle it, flag_excess_precision_cmdline 1687 will already have been set accordingly in the post_options 1688 hook. */ 1689 gcc_assert (flag_excess_precision_cmdline != EXCESS_PRECISION_DEFAULT); 1690 flag_excess_precision = flag_excess_precision_cmdline; 1691 if (flag_unsafe_math_optimizations) 1692 flag_excess_precision = EXCESS_PRECISION_FAST; 1693 if (flag_excess_precision == EXCESS_PRECISION_STANDARD) 1694 { 1695 int flt_eval_method = TARGET_FLT_EVAL_METHOD; 1696 switch (flt_eval_method) 1697 { 1698 case -1: 1699 case 0: 1700 /* Either the target acts unpredictably (-1) or has all the 1701 operations required not to have excess precision (0). */ 1702 flag_excess_precision = EXCESS_PRECISION_FAST; 1703 break; 1704 case 1: 1705 case 2: 1706 /* In these cases, predictable excess precision makes 1707 sense. */ 1708 break; 1709 default: 1710 /* Any other implementation-defined FLT_EVAL_METHOD values 1711 require the compiler to handle the associated excess 1712 precision rules in excess_precision_type. */ 1713 gcc_unreachable (); 1714 } 1715 } 1716 } 1717 1718 /* Initialize things that are both lang-dependent and target-dependent. 1719 This function can be called more than once if target parameters change. */ 1720 static void 1721 lang_dependent_init_target (void) 1722 { 1723 /* This determines excess precision settings. */ 1724 init_excess_precision (); 1725 1726 /* This creates various _DECL nodes, so needs to be called after the 1727 front end is initialized. It also depends on the HAVE_xxx macros 1728 generated from the target machine description. */ 1729 init_optabs (); 1730 1731 /* The following initialization functions need to generate rtl, so 1732 provide a dummy function context for them. */ 1733 init_dummy_function_start (); 1734 1735 /* Do the target-specific parts of expr initialization. */ 1736 init_expr_target (); 1737 1738 /* Although the actions of these functions are language-independent, 1739 they use optabs, so we cannot call them from backend_init. */ 1740 init_set_costs (); 1741 ira_init (); 1742 1743 expand_dummy_function_end (); 1744 } 1745 1746 /* Language-dependent initialization. Returns nonzero on success. */ 1747 static int 1748 lang_dependent_init (const char *name) 1749 { 1750 location_t save_loc = input_location; 1751 if (dump_base_name == 0) 1752 dump_base_name = name && name[0] ? name : "gccdump"; 1753 1754 /* Other front-end initialization. */ 1755 input_location = BUILTINS_LOCATION; 1756 if (lang_hooks.init () == 0) 1757 return 0; 1758 input_location = save_loc; 1759 1760 if (!flag_wpa) 1761 { 1762 init_asm_output (name); 1763 1764 /* If stack usage information is desired, open the output file. */ 1765 if (flag_stack_usage) 1766 stack_usage_file = open_auxiliary_file ("su"); 1767 } 1768 1769 /* This creates various _DECL nodes, so needs to be called after the 1770 front end is initialized. */ 1771 init_eh (); 1772 1773 /* Do the target-specific parts of the initialization. */ 1774 lang_dependent_init_target (); 1775 1776 if (!flag_wpa) 1777 { 1778 /* If dbx symbol table desired, initialize writing it and output the 1779 predefined types. */ 1780 timevar_push (TV_SYMOUT); 1781 1782 /* Now we have the correct original filename, we can initialize 1783 debug output. */ 1784 (*debug_hooks->init) (name); 1785 1786 timevar_pop (TV_SYMOUT); 1787 } 1788 1789 return 1; 1790 } 1791 1792 1793 /* Reinitialize everything when target parameters, such as register usage, 1794 have changed. */ 1795 void 1796 target_reinit (void) 1797 { 1798 struct rtl_data saved_x_rtl; 1799 rtx *saved_regno_reg_rtx; 1800 1801 /* Save *crtl and regno_reg_rtx around the reinitialization 1802 to allow target_reinit being called even after prepare_function_start. */ 1803 saved_regno_reg_rtx = regno_reg_rtx; 1804 if (saved_regno_reg_rtx) 1805 { 1806 saved_x_rtl = *crtl; 1807 memset (crtl, '\0', sizeof (*crtl)); 1808 regno_reg_rtx = NULL; 1809 } 1810 1811 /* Reinitialize RTL backend. */ 1812 backend_init_target (); 1813 1814 /* Reinitialize lang-dependent parts. */ 1815 lang_dependent_init_target (); 1816 1817 /* And restore it at the end, as free_after_compilation from 1818 expand_dummy_function_end clears it. */ 1819 if (saved_regno_reg_rtx) 1820 { 1821 *crtl = saved_x_rtl; 1822 regno_reg_rtx = saved_regno_reg_rtx; 1823 saved_regno_reg_rtx = NULL; 1824 } 1825 } 1826 1827 void 1828 dump_memory_report (bool final) 1829 { 1830 dump_line_table_statistics (); 1831 ggc_print_statistics (); 1832 stringpool_statistics (); 1833 dump_tree_statistics (); 1834 dump_gimple_statistics (); 1835 dump_rtx_statistics (); 1836 dump_alloc_pool_statistics (); 1837 dump_bitmap_statistics (); 1838 dump_vec_loc_statistics (); 1839 dump_ggc_loc_statistics (final); 1840 dump_alias_stats (stderr); 1841 dump_pta_stats (stderr); 1842 } 1843 1844 /* Clean up: close opened files, etc. */ 1845 1846 static void 1847 finalize (bool no_backend) 1848 { 1849 /* Close the dump files. */ 1850 if (flag_gen_aux_info) 1851 { 1852 fclose (aux_info_file); 1853 if (seen_error ()) 1854 unlink (aux_info_file_name); 1855 } 1856 1857 /* Close non-debugging input and output files. Take special care to note 1858 whether fclose returns an error, since the pages might still be on the 1859 buffer chain while the file is open. */ 1860 1861 if (asm_out_file) 1862 { 1863 if (ferror (asm_out_file) != 0) 1864 fatal_error ("error writing to %s: %m", asm_file_name); 1865 if (fclose (asm_out_file) != 0) 1866 fatal_error ("error closing %s: %m", asm_file_name); 1867 } 1868 1869 if (stack_usage_file) 1870 fclose (stack_usage_file); 1871 1872 if (!no_backend) 1873 { 1874 statistics_fini (); 1875 1876 finish_optimization_passes (); 1877 1878 ira_finish_once (); 1879 } 1880 1881 if (mem_report) 1882 dump_memory_report (true); 1883 1884 /* Language-specific end of compilation actions. */ 1885 lang_hooks.finish (); 1886 } 1887 1888 /* Initialize the compiler, and compile the input file. */ 1889 static void 1890 do_compile (void) 1891 { 1892 /* Initialize timing first. The C front ends read the main file in 1893 the post_options hook, and C++ does file timings. */ 1894 if (time_report || !quiet_flag || flag_detailed_statistics) 1895 timevar_init (); 1896 timevar_start (TV_TOTAL); 1897 1898 process_options (); 1899 1900 /* Don't do any more if an error has already occurred. */ 1901 if (!seen_error ()) 1902 { 1903 timevar_start (TV_PHASE_SETUP); 1904 1905 /* This must be run always, because it is needed to compute the FP 1906 predefined macros, such as __LDBL_MAX__, for targets using non 1907 default FP formats. */ 1908 init_adjust_machine_modes (); 1909 1910 /* Set up the back-end if requested. */ 1911 if (!no_backend) 1912 backend_init (); 1913 1914 /* Language-dependent initialization. Returns true on success. */ 1915 if (lang_dependent_init (main_input_filename)) 1916 { 1917 /* Initialize yet another pass. */ 1918 1919 ggc_protect_identifiers = true; 1920 1921 init_cgraph (); 1922 init_final (main_input_filename); 1923 coverage_init (aux_base_name); 1924 statistics_init (); 1925 invoke_plugin_callbacks (PLUGIN_START_UNIT, NULL); 1926 1927 timevar_stop (TV_PHASE_SETUP); 1928 1929 compile_file (); 1930 } 1931 else 1932 { 1933 timevar_stop (TV_PHASE_SETUP); 1934 } 1935 1936 timevar_start (TV_PHASE_FINALIZE); 1937 1938 finalize (no_backend); 1939 1940 timevar_stop (TV_PHASE_FINALIZE); 1941 } 1942 1943 /* Stop timing and print the times. */ 1944 timevar_stop (TV_TOTAL); 1945 timevar_print (stderr); 1946 } 1947 1948 /* Entry point of cc1, cc1plus, jc1, f771, etc. 1949 Exit code is FATAL_EXIT_CODE if can't open files or if there were 1950 any errors, or SUCCESS_EXIT_CODE if compilation succeeded. 1951 1952 It is not safe to call this function more than once. */ 1953 1954 int 1955 toplev_main (int argc, char **argv) 1956 { 1957 /* Parsing and gimplification sometimes need quite large stack. 1958 Increase stack size limits if possible. */ 1959 stack_limit_increase (64 * 1024 * 1024); 1960 1961 expandargv (&argc, &argv); 1962 1963 /* Initialization of GCC's environment, and diagnostics. */ 1964 general_init (argv[0]); 1965 1966 /* One-off initialization of options that does not need to be 1967 repeated when options are added for particular functions. */ 1968 init_options_once (); 1969 1970 /* Initialize global options structures; this must be repeated for 1971 each structure used for parsing options. */ 1972 init_options_struct (&global_options, &global_options_set); 1973 lang_hooks.init_options_struct (&global_options); 1974 1975 /* Convert the options to an array. */ 1976 decode_cmdline_options_to_array_default_mask (argc, 1977 CONST_CAST2 (const char **, 1978 char **, argv), 1979 &save_decoded_options, 1980 &save_decoded_options_count); 1981 1982 /* Perform language-specific options initialization. */ 1983 lang_hooks.init_options (save_decoded_options_count, save_decoded_options); 1984 1985 /* Parse the options and do minimal processing; basically just 1986 enough to default flags appropriately. */ 1987 decode_options (&global_options, &global_options_set, 1988 save_decoded_options, save_decoded_options_count, 1989 UNKNOWN_LOCATION, global_dc); 1990 1991 handle_common_deferred_options (); 1992 1993 init_local_tick (); 1994 1995 initialize_plugins (); 1996 1997 if (version_flag) 1998 print_version (stderr, ""); 1999 2000 if (help_flag) 2001 print_plugins_help (stderr, ""); 2002 2003 /* Exit early if we can (e.g. -help). */ 2004 if (!exit_after_options) 2005 do_compile (); 2006 2007 if (warningcount || errorcount) 2008 print_ignored_options (); 2009 diagnostic_finish (global_dc); 2010 2011 /* Invoke registered plugin callbacks if any. */ 2012 invoke_plugin_callbacks (PLUGIN_FINISH, NULL); 2013 2014 finalize_plugins (); 2015 if (seen_error ()) 2016 return (FATAL_EXIT_CODE); 2017 2018 return (SUCCESS_EXIT_CODE); 2019 } 2020