toplev.c revision 98573
1/* Top level of GNU C compiler 2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 3 1999, 2000, 2001, 2002 Free Software Foundation, Inc. 4 5This file is part of GCC. 6 7GCC is free software; you can redistribute it and/or modify it under 8the terms of the GNU General Public License as published by the Free 9Software Foundation; either version 2, or (at your option) any later 10version. 11 12GCC is distributed in the hope that it will be useful, but WITHOUT ANY 13WARRANTY; without even the implied warranty of MERCHANTABILITY or 14FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15for more details. 16 17You should have received a copy of the GNU General Public License 18along with GCC; see the file COPYING. If not, write to the Free 19Software Foundation, 59 Temple Place - Suite 330, Boston, MA 2002111-1307, USA. */ 21 22/* $FreeBSD: head/contrib/gcc/toplev.c 98573 2002-06-21 18:21:30Z obrien $ */ 23 24/* This is the top level of cc1/c++. 25 It parses command args, opens files, invokes the various passes 26 in the proper order, and counts the time used by each. 27 Error messages and low-level interface to malloc also handled here. */ 28 29#include "config.h" 30#undef FLOAT /* This is for hpux. They should change hpux. */ 31#undef FFS /* Some systems define this in param.h. */ 32#include "system.h" 33#include <signal.h> 34#include <setjmp.h> 35 36#ifdef HAVE_SYS_RESOURCE_H 37# include <sys/resource.h> 38#endif 39 40#ifdef HAVE_SYS_TIMES_H 41# include <sys/times.h> 42#endif 43 44#include "input.h" 45#include "tree.h" 46#include "rtl.h" 47#include "tm_p.h" 48#include "flags.h" 49#include "insn-attr.h" 50#include "insn-config.h" 51#include "insn-flags.h" 52#include "hard-reg-set.h" 53#include "recog.h" 54#include "output.h" 55#include "except.h" 56#include "function.h" 57#include "toplev.h" 58#include "expr.h" 59#include "basic-block.h" 60#include "intl.h" 61#include "ggc.h" 62#include "graph.h" 63#include "loop.h" 64#include "regs.h" 65#include "timevar.h" 66#include "diagnostic.h" 67#include "ssa.h" 68#include "params.h" 69#include "reload.h" 70#include "dwarf2asm.h" 71#include "integrate.h" 72#include "debug.h" 73#include "target.h" 74#include "langhooks.h" 75 76#if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO) 77#include "dwarf2out.h" 78#endif 79 80#if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) 81#include "dbxout.h" 82#endif 83 84#ifdef SDB_DEBUGGING_INFO 85#include "sdbout.h" 86#endif 87 88#ifdef XCOFF_DEBUGGING_INFO 89#include "xcoffout.h" /* Needed for external data 90 declarations for e.g. AIX 4.x. */ 91#endif 92 93#ifdef HALF_PIC_DEBUG 94#include "halfpic.h" 95#endif 96 97/* Carry information from ASM_DECLARE_OBJECT_NAME 98 to ASM_FINISH_DECLARE_OBJECT. */ 99 100extern int size_directive_output; 101extern tree last_assemble_variable_decl; 102 103static void general_init PARAMS ((char *)); 104static void parse_options_and_default_flags PARAMS ((int, char **)); 105static void do_compile PARAMS ((void)); 106static void process_options PARAMS ((void)); 107static void lang_independent_init PARAMS ((void)); 108static int lang_dependent_init PARAMS ((const char *)); 109static void init_asm_output PARAMS ((const char *)); 110static void finalize PARAMS ((void)); 111 112static void set_target_switch PARAMS ((const char *)); 113static const char *decl_name PARAMS ((tree, int)); 114 115static void float_signal PARAMS ((int)) ATTRIBUTE_NORETURN; 116static void crash_signal PARAMS ((int)) ATTRIBUTE_NORETURN; 117static void set_float_handler PARAMS ((jmp_buf)); 118static void compile_file PARAMS ((void)); 119static void display_help PARAMS ((void)); 120static void display_target_options PARAMS ((void)); 121 122static void decode_d_option PARAMS ((const char *)); 123static int decode_f_option PARAMS ((const char *)); 124static int decode_W_option PARAMS ((const char *)); 125static int decode_g_option PARAMS ((const char *)); 126static unsigned int independent_decode_option PARAMS ((int, char **)); 127 128static void print_version PARAMS ((FILE *, const char *)); 129static int print_single_switch PARAMS ((FILE *, int, int, const char *, 130 const char *, const char *, 131 const char *, const char *)); 132static void print_switch_values PARAMS ((FILE *, int, int, const char *, 133 const char *, const char *)); 134 135/* Length of line when printing switch values. */ 136#define MAX_LINE 75 137 138/* Name of program invoked, sans directories. */ 139 140const char *progname; 141 142/* Copy of arguments to toplev_main. */ 143int save_argc; 144char **save_argv; 145 146/* Name of current original source file (what was input to cpp). 147 This comes from each #-command in the actual input. */ 148 149const char *input_filename; 150 151/* Name of top-level original source file (what was input to cpp). 152 This comes from the #-command at the beginning of the actual input. 153 If there isn't any there, then this is the cc1 input file name. */ 154 155const char *main_input_filename; 156 157/* Current line number in real source file. */ 158 159int lineno; 160 161/* Nonzero if it is unsafe to create any new pseudo registers. */ 162int no_new_pseudos; 163 164/* Stack of currently pending input files. */ 165 166struct file_stack *input_file_stack; 167 168/* Incremented on each change to input_file_stack. */ 169int input_file_stack_tick; 170 171/* Name to use as base of names for dump output files. */ 172 173const char *dump_base_name; 174 175/* Format to use to print dumpfile index value */ 176#ifndef DUMPFILE_FORMAT 177#define DUMPFILE_FORMAT ".%02d." 178#endif 179 180/* Bit flags that specify the machine subtype we are compiling for. 181 Bits are tested using macros TARGET_... defined in the tm.h file 182 and set by `-m...' switches. Must be defined in rtlanal.c. */ 183 184extern int target_flags; 185 186/* Debug hooks - dependent upon command line options. */ 187 188struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks; 189 190/* Describes a dump file. */ 191 192struct dump_file_info 193{ 194 /* The unique extension to apply, e.g. ".jump". */ 195 const char *const extension; 196 197 /* The -d<c> character that enables this dump file. */ 198 char const debug_switch; 199 200 /* True if there is a corresponding graph dump file. */ 201 char const graph_dump_p; 202 203 /* True if the user selected this dump. */ 204 char enabled; 205 206 /* True if the files have been initialized (ie truncated). */ 207 char initialized; 208}; 209 210/* Enumerate the extant dump files. */ 211 212enum dump_file_index 213{ 214 DFI_rtl, 215 DFI_sibling, 216 DFI_eh, 217 DFI_jump, 218 DFI_ssa, 219 DFI_ssa_ccp, 220 DFI_ssa_dce, 221 DFI_ussa, 222 DFI_cse, 223 DFI_addressof, 224 DFI_gcse, 225 DFI_loop, 226 DFI_cse2, 227 DFI_cfg, 228 DFI_bp, 229 DFI_life, 230 DFI_combine, 231 DFI_ce, 232 DFI_regmove, 233 DFI_sched, 234 DFI_lreg, 235 DFI_greg, 236 DFI_postreload, 237 DFI_flow2, 238 DFI_peephole2, 239 DFI_rnreg, 240 DFI_ce2, 241 DFI_sched2, 242 DFI_stack, 243 DFI_bbro, 244 DFI_mach, 245 DFI_dbr, 246 DFI_MAX 247}; 248 249/* Describes all the dump files. Should be kept in order of the 250 pass and in sync with dump_file_index above. 251 252 Remaining -d letters: 253 254 " o q u " 255 " H JK OPQ TUV YZ" 256*/ 257 258static struct dump_file_info dump_file[DFI_MAX] = 259{ 260 { "rtl", 'r', 0, 0, 0 }, 261 { "sibling", 'i', 0, 0, 0 }, 262 { "eh", 'h', 0, 0, 0 }, 263 { "jump", 'j', 0, 0, 0 }, 264 { "ssa", 'e', 1, 0, 0 }, 265 { "ssaccp", 'W', 1, 0, 0 }, 266 { "ssadce", 'X', 1, 0, 0 }, 267 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */ 268 { "cse", 's', 0, 0, 0 }, 269 { "addressof", 'F', 0, 0, 0 }, 270 { "gcse", 'G', 1, 0, 0 }, 271 { "loop", 'L', 1, 0, 0 }, 272 { "cse2", 't', 1, 0, 0 }, 273 { "cfg", 'f', 1, 0, 0 }, 274 { "bp", 'b', 1, 0, 0 }, 275 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */ 276 { "combine", 'c', 1, 0, 0 }, 277 { "ce", 'C', 1, 0, 0 }, 278 { "regmove", 'N', 1, 0, 0 }, 279 { "sched", 'S', 1, 0, 0 }, 280 { "lreg", 'l', 1, 0, 0 }, 281 { "greg", 'g', 1, 0, 0 }, 282 { "postreload", 'o', 1, 0, 0 }, 283 { "flow2", 'w', 1, 0, 0 }, 284 { "peephole2", 'z', 1, 0, 0 }, 285 { "rnreg", 'n', 1, 0, 0 }, 286 { "ce2", 'E', 1, 0, 0 }, 287 { "sched2", 'R', 1, 0, 0 }, 288 { "stack", 'k', 1, 0, 0 }, 289 { "bbro", 'B', 1, 0, 0 }, 290 { "mach", 'M', 1, 0, 0 }, 291 { "dbr", 'd', 0, 0, 0 }, 292}; 293 294static int open_dump_file PARAMS ((enum dump_file_index, tree)); 295static void close_dump_file PARAMS ((enum dump_file_index, 296 void (*) (FILE *, rtx), rtx)); 297 298/* Other flags saying which kinds of debugging dump have been requested. */ 299 300int rtl_dump_and_exit; 301int flag_print_asm_name; 302static int version_flag; 303static char *filename; 304enum graph_dump_types graph_dump_format; 305 306/* Name for output file of assembly code, specified with -o. */ 307 308char *asm_file_name; 309 310/* Value of the -G xx switch, and whether it was passed or not. */ 311int g_switch_value; 312int g_switch_set; 313 314/* Type(s) of debugging information we are producing (if any). 315 See flags.h for the definitions of the different possible 316 types of debugging information. */ 317enum debug_info_type write_symbols = NO_DEBUG; 318 319/* Level of debugging information we are producing. See flags.h 320 for the definitions of the different possible levels. */ 321enum debug_info_level debug_info_level = DINFO_LEVEL_NONE; 322 323/* Nonzero means use GNU-only extensions in the generated symbolic 324 debugging information. */ 325/* Currently, this only has an effect when write_symbols is set to 326 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */ 327int use_gnu_debug_info_extensions = 0; 328 329/* Nonzero means do optimizations. -O. 330 Particular numeric values stand for particular amounts of optimization; 331 thus, -O2 stores 2 here. However, the optimizations beyond the basic 332 ones are not controlled directly by this variable. Instead, they are 333 controlled by individual `flag_...' variables that are defaulted 334 based on this variable. */ 335 336int optimize = 0; 337 338/* Nonzero means optimize for size. -Os. 339 The only valid values are zero and non-zero. When optimize_size is 340 non-zero, optimize defaults to 2, but certain individual code 341 bloating optimizations are disabled. */ 342 343int optimize_size = 0; 344 345/* Nonzero if we should exit after parsing options. */ 346static int exit_after_options = 0; 347 348/* The FUNCTION_DECL for the function currently being compiled, 349 or 0 if between functions. */ 350tree current_function_decl; 351 352/* Set to the FUNC_BEGIN label of the current function, or NULL_TREE 353 if none. */ 354tree current_function_func_begin_label; 355 356/* Pointer to function to compute the name to use to print a declaration. 357 DECL is the declaration in question. 358 VERBOSITY determines what information will be printed: 359 0: DECL_NAME, demangled as necessary. 360 1: and scope information. 361 2: and any other information that might be interesting, such as function 362 parameter types in C++. */ 363 364const char *(*decl_printable_name) PARAMS ((tree, int)); 365 366/* Pointer to function to compute rtl for a language-specific tree code. */ 367 368typedef rtx (*lang_expand_expr_t) 369 PARAMS ((union tree_node *, rtx, enum machine_mode, 370 enum expand_modifier modifier)); 371 372lang_expand_expr_t lang_expand_expr = 0; 373 374/* Pointer to function to finish handling an incomplete decl at the 375 end of compilation. */ 376 377void (*incomplete_decl_finalize_hook) PARAMS ((tree)) = 0; 378 379/* Nonzero if doing dwarf2 duplicate elimination. */ 380 381int flag_eliminate_dwarf2_dups = 0; 382 383/* Nonzero if generating code to do profiling. */ 384 385int profile_flag = 0; 386 387/* Nonzero if generating code to profile program flow graph arcs. */ 388 389int profile_arc_flag = 0; 390 391/* Nonzero if generating info for gcov to calculate line test coverage. */ 392 393int flag_test_coverage = 0; 394 395/* Nonzero indicates that branch taken probabilities should be calculated. */ 396 397int flag_branch_probabilities = 0; 398 399/* Nonzero if basic blocks should be reordered. */ 400 401int flag_reorder_blocks = 0; 402 403/* Nonzero if registers should be renamed. */ 404 405int flag_rename_registers = 0; 406int flag_cprop_registers = 0; 407 408/* Nonzero for -pedantic switch: warn about anything 409 that standard spec forbids. */ 410 411int pedantic = 0; 412 413/* Temporarily suppress certain warnings. 414 This is set while reading code from a system header file. */ 415 416int in_system_header = 0; 417 418/* Don't print functions as they are compiled. -quiet. */ 419 420int quiet_flag = 0; 421 422/* Print times taken by the various passes. -ftime-report. */ 423 424int time_report = 0; 425 426/* Print memory still in use at end of compilation (which may have little 427 to do with peak memory consumption). -fmem-report. */ 428 429int mem_report = 0; 430 431/* Non-zero means to collect statistics which might be expensive 432 and to print them when we are done. */ 433int flag_detailed_statistics = 0; 434 435 436/* -f flags. */ 437 438/* Nonzero means `char' should be signed. */ 439 440int flag_signed_char; 441 442/* Nonzero means give an enum type only as many bytes as it needs. */ 443 444int flag_short_enums; 445 446/* Nonzero for -fcaller-saves: allocate values in regs that need to 447 be saved across function calls, if that produces overall better code. 448 Optional now, so people can test it. */ 449 450#ifdef DEFAULT_CALLER_SAVES 451int flag_caller_saves = 1; 452#else 453int flag_caller_saves = 0; 454#endif 455 456/* Nonzero if structures and unions should be returned in memory. 457 458 This should only be defined if compatibility with another compiler or 459 with an ABI is needed, because it results in slower code. */ 460 461#ifndef DEFAULT_PCC_STRUCT_RETURN 462#define DEFAULT_PCC_STRUCT_RETURN 1 463#endif 464 465/* Nonzero for -fpcc-struct-return: return values the same way PCC does. */ 466 467int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN; 468 469/* Nonzero for -fforce-mem: load memory value into a register 470 before arithmetic on it. This makes better cse but slower compilation. */ 471 472int flag_force_mem = 0; 473 474/* Nonzero for -fforce-addr: load memory address into a register before 475 reference to memory. This makes better cse but slower compilation. */ 476 477int flag_force_addr = 0; 478 479/* Nonzero for -fdefer-pop: don't pop args after each function call; 480 instead save them up to pop many calls' args with one insns. */ 481 482int flag_defer_pop = 0; 483 484/* Nonzero for -ffloat-store: don't allocate floats and doubles 485 in extended-precision registers. */ 486 487int flag_float_store = 0; 488 489/* Nonzero for -fcse-follow-jumps: 490 have cse follow jumps to do a more extensive job. */ 491 492int flag_cse_follow_jumps; 493 494/* Nonzero for -fcse-skip-blocks: 495 have cse follow a branch around a block. */ 496int flag_cse_skip_blocks; 497 498/* Nonzero for -fexpensive-optimizations: 499 perform miscellaneous relatively-expensive optimizations. */ 500int flag_expensive_optimizations; 501 502/* Nonzero for -fthread-jumps: 503 have jump optimize output of loop. */ 504 505int flag_thread_jumps; 506 507/* Nonzero enables strength-reduction in loop.c. */ 508 509int flag_strength_reduce = 0; 510 511/* Nonzero enables loop unrolling in unroll.c. Only loops for which the 512 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY, 513 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are 514 unrolled. */ 515 516int flag_unroll_loops; 517 518/* Nonzero enables loop unrolling in unroll.c. All loops are unrolled. 519 This is generally not a win. */ 520 521int flag_unroll_all_loops; 522 523/* Nonzero enables prefetch optimizations for arrays in loops. */ 524 525int flag_prefetch_loop_arrays; 526 527/* Nonzero forces all invariant computations in loops to be moved 528 outside the loop. */ 529 530int flag_move_all_movables = 0; 531 532/* Nonzero forces all general induction variables in loops to be 533 strength reduced. */ 534 535int flag_reduce_all_givs = 0; 536 537/* Nonzero to perform full register move optimization passes. This is the 538 default for -O2. */ 539 540int flag_regmove = 0; 541 542/* Nonzero for -fwritable-strings: 543 store string constants in data segment and don't uniquize them. */ 544 545int flag_writable_strings = 0; 546 547/* Nonzero means don't put addresses of constant functions in registers. 548 Used for compiling the Unix kernel, where strange substitutions are 549 done on the assembly output. */ 550 551int flag_no_function_cse = 0; 552 553/* Nonzero for -fomit-frame-pointer: 554 don't make a frame pointer in simple functions that don't require one. */ 555 556int flag_omit_frame_pointer = 0; 557 558/* Nonzero means place each function into its own section on those platforms 559 which support arbitrary section names and unlimited numbers of sections. */ 560 561int flag_function_sections = 0; 562 563/* ... and similar for data. */ 564 565int flag_data_sections = 0; 566 567/* Nonzero to inhibit use of define_optimization peephole opts. */ 568 569int flag_no_peephole = 0; 570 571/* Nonzero allows GCC to optimize sibling and tail recursive calls. */ 572 573int flag_optimize_sibling_calls = 0; 574 575/* Nonzero means the front end generally wants `errno' maintained by math 576 operations, like built-in SQRT. */ 577 578int flag_errno_math = 1; 579 580/* Nonzero means that unsafe floating-point math optimizations are allowed 581 for the sake of speed. IEEE compliance is not guaranteed, and operations 582 are allowed to assume that their arguments and results are "normal" 583 (e.g., nonnegative for SQRT). */ 584 585int flag_unsafe_math_optimizations = 0; 586 587/* Zero means that floating-point math operations cannot generate a 588 (user-visible) trap. This is the case, for example, in nonstop 589 IEEE 754 arithmetic. */ 590 591int flag_trapping_math = 1; 592 593/* 0 means straightforward implementation of complex divide acceptable. 594 1 means wide ranges of inputs must work for complex divide. 595 2 means C99-like requirements for complex divide (not yet implemented). */ 596 597int flag_complex_divide_method = 0; 598 599/* Nonzero means all references through pointers are volatile. */ 600 601int flag_volatile; 602 603/* Nonzero means treat all global and extern variables as volatile. */ 604 605int flag_volatile_global; 606 607/* Nonzero means treat all static variables as volatile. */ 608 609int flag_volatile_static; 610 611/* Nonzero means just do syntax checking; don't output anything. */ 612 613int flag_syntax_only = 0; 614 615/* Nonzero means perform global cse. */ 616 617static int flag_gcse; 618 619/* Nonzero means to use global dataflow analysis to eliminate 620 useless null pointer tests. */ 621 622static int flag_delete_null_pointer_checks; 623 624/* Nonzero means to do the enhanced load motion during gcse, which trys 625 to hoist loads by not killing them when a store to the same location 626 is seen. */ 627 628int flag_gcse_lm = 1; 629 630/* Nonzero means to perform store motion after gcse, which will try to 631 move stores closer to the exit block. Its not very effective without 632 flag_gcse_lm. */ 633 634int flag_gcse_sm = 1; 635 636/* Nonzero means to rerun cse after loop optimization. This increases 637 compilation time about 20% and picks up a few more common expressions. */ 638 639static int flag_rerun_cse_after_loop; 640 641/* Nonzero means to run loop optimizations twice. */ 642 643int flag_rerun_loop_opt; 644 645/* Nonzero for -finline-functions: ok to inline functions that look like 646 good inline candidates. */ 647 648int flag_inline_functions; 649 650/* Nonzero for -fkeep-inline-functions: even if we make a function 651 go inline everywhere, keep its definition around for debugging 652 purposes. */ 653 654int flag_keep_inline_functions; 655 656/* Nonzero means that functions will not be inlined. */ 657 658int flag_no_inline = 2; 659 660/* Nonzero means that we don't want inlining by virtue of -fno-inline, 661 not just because the tree inliner turned us off. */ 662 663int flag_really_no_inline = 2; 664 665/* Nonzero means that we should emit static const variables 666 regardless of whether or not optimization is turned on. */ 667 668int flag_keep_static_consts = 1; 669 670/* Nonzero means we should be saving declaration info into a .X file. */ 671 672int flag_gen_aux_info = 0; 673 674/* Specified name of aux-info file. */ 675 676static char *aux_info_file_name; 677 678/* Nonzero means make the text shared if supported. */ 679 680int flag_shared_data; 681 682/* Nonzero means schedule into delayed branch slots if supported. */ 683 684int flag_delayed_branch; 685 686/* Nonzero if we are compiling pure (sharable) code. 687 Value is 1 if we are doing reasonable (i.e. simple 688 offset into offset table) pic. Value is 2 if we can 689 only perform register offsets. */ 690 691int flag_pic; 692 693/* Nonzero means generate extra code for exception handling and enable 694 exception handling. */ 695 696int flag_exceptions; 697 698/* Nonzero means generate frame unwind info table when supported. */ 699 700int flag_unwind_tables = 0; 701 702/* Nonzero means generate frame unwind info table exact at each insn boundary */ 703 704int flag_asynchronous_unwind_tables = 0; 705 706/* Nonzero means don't place uninitialized global data in common storage 707 by default. */ 708 709int flag_no_common; 710 711/* Nonzero means pretend it is OK to examine bits of target floats, 712 even if that isn't true. The resulting code will have incorrect constants, 713 but the same series of instructions that the native compiler would make. */ 714 715int flag_pretend_float; 716 717/* Nonzero means change certain warnings into errors. 718 Usually these are warnings about failure to conform to some standard. */ 719 720int flag_pedantic_errors = 0; 721 722/* flag_schedule_insns means schedule insns within basic blocks (before 723 local_alloc). 724 flag_schedule_insns_after_reload means schedule insns after 725 global_alloc. */ 726 727int flag_schedule_insns = 0; 728int flag_schedule_insns_after_reload = 0; 729 730/* The following flags have effect only for scheduling before register 731 allocation: 732 733 flag_schedule_interblock means schedule insns accross basic blocks. 734 flag_schedule_speculative means allow speculative motion of non-load insns. 735 flag_schedule_speculative_load means allow speculative motion of some 736 load insns. 737 flag_schedule_speculative_load_dangerous allows speculative motion of more 738 load insns. */ 739 740int flag_schedule_interblock = 1; 741int flag_schedule_speculative = 1; 742int flag_schedule_speculative_load = 0; 743int flag_schedule_speculative_load_dangerous = 0; 744 745int flag_single_precision_constant; 746 747/* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple 748 by a cheaper branch on a count register. */ 749int flag_branch_on_count_reg = 1; 750 751/* -finhibit-size-directive inhibits output of .size for ELF. 752 This is used only for compiling crtstuff.c, 753 and it may be extended to other effects 754 needed for crtstuff.c on other systems. */ 755int flag_inhibit_size_directive = 0; 756 757/* -fverbose-asm causes extra commentary information to be produced in 758 the generated assembly code (to make it more readable). This option 759 is generally only of use to those who actually need to read the 760 generated assembly code (perhaps while debugging the compiler itself). 761 -fno-verbose-asm, the default, causes the extra information 762 to be omitted and is useful when comparing two assembler files. */ 763 764int flag_verbose_asm = 0; 765 766/* -dA causes debug commentary information to be produced in 767 the generated assembly code (to make it more readable). This option 768 is generally only of use to those who actually need to read the 769 generated assembly code (perhaps while debugging the compiler itself). 770 Currently, this switch is only used by dwarfout.c; however, it is intended 771 to be a catchall for printing debug information in the assembler file. */ 772 773int flag_debug_asm = 0; 774 775/* -dP causes the rtl to be emitted as a comment in assembly. */ 776 777int flag_dump_rtl_in_asm = 0; 778 779/* -fgnu-linker specifies use of the GNU linker for initializations. 780 (Or, more generally, a linker that handles initializations.) 781 -fno-gnu-linker says that collect2 will be used. */ 782#ifdef USE_COLLECT2 783int flag_gnu_linker = 0; 784#else 785int flag_gnu_linker = 1; 786#endif 787 788/* Enable SSA. */ 789int flag_ssa = 0; 790 791/* Enable ssa conditional constant propagation. */ 792int flag_ssa_ccp = 0; 793 794/* Enable ssa aggressive dead code elimination. */ 795int flag_ssa_dce = 0; 796 797/* Tag all structures with __attribute__(packed). */ 798int flag_pack_struct = 0; 799 800/* Nonzero means that -Wformat accepts certain system-dependent formats. */ 801int flag_format_extensions = 0; 802 803/* Emit code to check for stack overflow; also may cause large objects 804 to be allocated dynamically. */ 805int flag_stack_check; 806 807/* When non-NULL, indicates that whenever space is allocated on the 808 stack, the resulting stack pointer must not pass this 809 address---that is, for stacks that grow downward, the stack pointer 810 must always be greater than or equal to this address; for stacks 811 that grow upward, the stack pointer must be less than this address. 812 At present, the rtx may be either a REG or a SYMBOL_REF, although 813 the support provided depends on the backend. */ 814rtx stack_limit_rtx; 815 816/* 0 if pointer arguments may alias each other. True in C. 817 1 if pointer arguments may not alias each other but may alias 818 global variables. 819 2 if pointer arguments may not alias each other and may not 820 alias global variables. True in Fortran. 821 This defaults to 0 for C. */ 822int flag_argument_noalias = 0; 823 824/* Nonzero if we should do (language-dependent) alias analysis. 825 Typically, this analysis will assume that expressions of certain 826 types do not alias expressions of certain other types. Only used 827 if alias analysis (in general) is enabled. */ 828int flag_strict_aliasing = 0; 829 830/* Instrument functions with calls at entry and exit, for profiling. */ 831int flag_instrument_function_entry_exit = 0; 832 833/* Nonzero means ignore `#ident' directives. 0 means handle them. 834 On SVR4 targets, it also controls whether or not to emit a 835 string identifying the compiler. */ 836 837int flag_no_ident = 0; 838 839/* This will perform a peephole pass before sched2. */ 840int flag_peephole2 = 0; 841 842/* This will try to guess branch probabilities. */ 843int flag_guess_branch_prob = 0; 844 845/* -fbounded-pointers causes gcc to compile pointers as composite 846 objects occupying three words: the pointer value, the base address 847 of the referent object, and the address immediately beyond the end 848 of the referent object. The base and extent allow us to perform 849 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */ 850int flag_bounded_pointers = 0; 851 852/* -fcheck-bounds causes gcc to generate array bounds checks. 853 For C, C++: defaults to value of flag_bounded_pointers. 854 For ObjC: defaults to off. 855 For Java: defaults to on. 856 For Fortran: defaults to off. 857 For CHILL: defaults to off. */ 858int flag_bounds_check = 0; 859 860/* This will attempt to merge constant section constants, if 1 only 861 string constants and constants from constant pool, if 2 also constant 862 variables. */ 863int flag_merge_constants = 1; 864 865/* If one, renumber instruction UIDs to reduce the number of 866 unused UIDs if there are a lot of instructions. If greater than 867 one, unconditionally renumber instruction UIDs. */ 868int flag_renumber_insns = 1; 869 870/* Values of the -falign-* flags: how much to align labels in code. 871 0 means `use default', 1 means `don't align'. 872 For each variable, there is an _log variant which is the power 873 of two not less than the variable, for .align output. */ 874 875int align_loops; 876int align_loops_log; 877int align_loops_max_skip; 878int align_jumps; 879int align_jumps_log; 880int align_jumps_max_skip; 881int align_labels; 882int align_labels_log; 883int align_labels_max_skip; 884int align_functions; 885int align_functions_log; 886 887/* Table of supported debugging formats. */ 888static const struct 889{ 890 const char *const arg; 891 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a 892 constant expression, we use NO_DEBUG in its place. */ 893 const enum debug_info_type debug_type; 894 const int use_extensions_p; 895 const char *const description; 896} *da, 897debug_args[] = 898{ 899 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS, 900 N_("Generate debugging info in default format") }, 901 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") }, 902#ifdef DBX_DEBUGGING_INFO 903 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") }, 904 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") }, 905#endif 906#ifdef DWARF_DEBUGGING_INFO 907 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") }, 908 { "dwarf+", DWARF_DEBUG, 1, 909 N_("Generate extended DWARF-1 format debug info") }, 910#endif 911#ifdef DWARF2_DEBUGGING_INFO 912 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") }, 913#endif 914#ifdef XCOFF_DEBUGGING_INFO 915 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") }, 916 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") }, 917#endif 918#ifdef SDB_DEBUGGING_INFO 919 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") }, 920#endif 921#ifdef VMS_DEBUGGING_INFO 922 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") }, 923#endif 924 { 0, 0, 0, 0 } 925}; 926 927typedef struct 928{ 929 const char *const string; 930 int *const variable; 931 const int on_value; 932 const char *const description; 933} 934lang_independent_options; 935 936int flag_trapv = 0; 937 938/* Add or remove a leading underscore from user symbols. */ 939int flag_leading_underscore = -1; 940 941/* The user symbol prefix after having resolved same. */ 942const char *user_label_prefix; 943 944static const param_info lang_independent_params[] = { 945#define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \ 946 { OPTION, DEFAULT, HELP }, 947#include "params.def" 948#undef DEFPARAM 949 { NULL, 0, NULL } 950}; 951 952/* A default for same. */ 953#ifndef USER_LABEL_PREFIX 954#define USER_LABEL_PREFIX "" 955#endif 956 957/* Table of language-independent -f options. 958 STRING is the option name. VARIABLE is the address of the variable. 959 ON_VALUE is the value to store in VARIABLE 960 if `-fSTRING' is seen as an option. 961 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */ 962 963static const lang_independent_options f_options[] = 964{ 965 {"format-extensions", &flag_format_extensions, 1, 966 N_("-Wformat accepts certain FreeBSD system-dependent formats") }, 967 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1, 968 N_("Perform DWARF2 duplicate elimination") }, 969 {"float-store", &flag_float_store, 1, 970 N_("Do not store floats in registers") }, 971 {"volatile", &flag_volatile, 1, 972 N_("Consider all mem refs through pointers as volatile") }, 973 {"volatile-global", &flag_volatile_global, 1, 974 N_("Consider all mem refs to global data to be volatile") }, 975 {"volatile-static", &flag_volatile_static, 1, 976 N_("Consider all mem refs to static data to be volatile") }, 977 {"defer-pop", &flag_defer_pop, 1, 978 N_("Defer popping functions args from stack until later") }, 979 {"omit-frame-pointer", &flag_omit_frame_pointer, 1, 980 N_("When possible do not generate stack frames") }, 981 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1, 982 N_("Optimize sibling and tail recursive calls") }, 983 {"cse-follow-jumps", &flag_cse_follow_jumps, 1, 984 N_("When running CSE, follow jumps to their targets") }, 985 {"cse-skip-blocks", &flag_cse_skip_blocks, 1, 986 N_("When running CSE, follow conditional jumps") }, 987 {"expensive-optimizations", &flag_expensive_optimizations, 1, 988 N_("Perform a number of minor, expensive optimizations") }, 989 {"thread-jumps", &flag_thread_jumps, 1, 990 N_("Perform jump threading optimizations") }, 991 {"strength-reduce", &flag_strength_reduce, 1, 992 N_("Perform strength reduction optimizations") }, 993 {"unroll-loops", &flag_unroll_loops, 1, 994 N_("Perform loop unrolling when iteration count is known") }, 995 {"unroll-all-loops", &flag_unroll_all_loops, 1, 996 N_("Perform loop unrolling for all loops") }, 997 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1, 998 N_("Generate prefetch instructions, if available, for arrays in loops") }, 999 {"move-all-movables", &flag_move_all_movables, 1, 1000 N_("Force all loop invariant computations out of loops") }, 1001 {"reduce-all-givs", &flag_reduce_all_givs, 1, 1002 N_("Strength reduce all loop general induction variables") }, 1003 {"writable-strings", &flag_writable_strings, 1, 1004 N_("Store strings in writable data section") }, 1005 {"peephole", &flag_no_peephole, 0, 1006 N_("Enable machine specific peephole optimizations") }, 1007 {"force-mem", &flag_force_mem, 1, 1008 N_("Copy memory operands into registers before using") }, 1009 {"force-addr", &flag_force_addr, 1, 1010 N_("Copy memory address constants into regs before using") }, 1011 {"function-cse", &flag_no_function_cse, 0, 1012 N_("Allow function addresses to be held in registers") }, 1013 {"inline-functions", &flag_inline_functions, 1, 1014 N_("Integrate simple functions into their callers") }, 1015 {"keep-inline-functions", &flag_keep_inline_functions, 1, 1016 N_("Generate code for funcs even if they are fully inlined") }, 1017 {"inline", &flag_no_inline, 0, 1018 N_("Pay attention to the 'inline' keyword") }, 1019 {"keep-static-consts", &flag_keep_static_consts, 1, 1020 N_("Emit static const variables even if they are not used") }, 1021 {"syntax-only", &flag_syntax_only, 1, 1022 N_("Check for syntax errors, then stop") }, 1023 {"shared-data", &flag_shared_data, 1, 1024 N_("Mark data as shared rather than private") }, 1025 {"caller-saves", &flag_caller_saves, 1, 1026 N_("Enable saving registers around function calls") }, 1027 {"pcc-struct-return", &flag_pcc_struct_return, 1, 1028 N_("Return 'short' aggregates in memory, not registers") }, 1029 {"reg-struct-return", &flag_pcc_struct_return, 0, 1030 N_("Return 'short' aggregates in registers") }, 1031 {"delayed-branch", &flag_delayed_branch, 1, 1032 N_("Attempt to fill delay slots of branch instructions") }, 1033 {"gcse", &flag_gcse, 1, 1034 N_("Perform the global common subexpression elimination") }, 1035 {"gcse-lm", &flag_gcse_lm, 1, 1036 N_("Perform enhanced load motion during global subexpression elimination") }, 1037 {"gcse-sm", &flag_gcse_sm, 1, 1038 N_("Perform store motion after global subexpression elimination") }, 1039 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1, 1040 N_("Run CSE pass after loop optimizations") }, 1041 {"rerun-loop-opt", &flag_rerun_loop_opt, 1, 1042 N_("Run the loop optimizer twice") }, 1043 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1, 1044 N_("Delete useless null pointer checks") }, 1045 {"pretend-float", &flag_pretend_float, 1, 1046 N_("Pretend that host and target use the same FP format") }, 1047 {"schedule-insns", &flag_schedule_insns, 1, 1048 N_("Reschedule instructions before register allocation") }, 1049 {"schedule-insns2", &flag_schedule_insns_after_reload, 1, 1050 N_("Reschedule instructions after register allocation") }, 1051 {"sched-interblock",&flag_schedule_interblock, 1, 1052 N_("Enable scheduling across basic blocks") }, 1053 {"sched-spec",&flag_schedule_speculative, 1, 1054 N_("Allow speculative motion of non-loads") }, 1055 {"sched-spec-load",&flag_schedule_speculative_load, 1, 1056 N_("Allow speculative motion of some loads") }, 1057 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1, 1058 N_("Allow speculative motion of more loads") }, 1059 {"branch-count-reg",&flag_branch_on_count_reg, 1, 1060 N_("Replace add,compare,branch with branch on count reg") }, 1061 {"pic", &flag_pic, 1, 1062 N_("Generate position independent code, if possible") }, 1063 {"PIC", &flag_pic, 2, ""}, 1064 {"exceptions", &flag_exceptions, 1, 1065 N_("Enable exception handling") }, 1066 {"unwind-tables", &flag_unwind_tables, 1, 1067 N_("Just generate unwind tables for exception handling") }, 1068 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1, 1069 N_("Generate unwind tables exact at each instruction boundary") }, 1070 {"non-call-exceptions", &flag_non_call_exceptions, 1, 1071 N_("Support synchronous non-call exceptions") }, 1072 {"profile-arcs", &profile_arc_flag, 1, 1073 N_("Insert arc based program profiling code") }, 1074 {"test-coverage", &flag_test_coverage, 1, 1075 N_("Create data files needed by gcov") }, 1076 {"branch-probabilities", &flag_branch_probabilities, 1, 1077 N_("Use profiling information for branch probabilities") }, 1078 {"reorder-blocks", &flag_reorder_blocks, 1, 1079 N_("Reorder basic blocks to improve code placement") }, 1080 {"rename-registers", &flag_rename_registers, 1, 1081 N_("Do the register renaming optimization pass") }, 1082 {"cprop-registers", &flag_cprop_registers, 1, 1083 N_("Do the register copy-propagation optimization pass") }, 1084 {"common", &flag_no_common, 0, 1085 N_("Do not put uninitialized globals in the common section") }, 1086 {"inhibit-size-directive", &flag_inhibit_size_directive, 1, 1087 N_("Do not generate .size directives") }, 1088 {"function-sections", &flag_function_sections, 1, 1089 N_("place each function into its own section") }, 1090 {"data-sections", &flag_data_sections, 1, 1091 N_("place data items into their own section") }, 1092 {"verbose-asm", &flag_verbose_asm, 1, 1093 N_("Add extra commentry to assembler output") }, 1094 {"gnu-linker", &flag_gnu_linker, 1, 1095 N_("Output GNU ld formatted global initializers") }, 1096 {"regmove", &flag_regmove, 1, 1097 N_("Enables a register move optimization") }, 1098 {"optimize-register-move", &flag_regmove, 1, 1099 N_("Do the full regmove optimization pass") }, 1100 {"pack-struct", &flag_pack_struct, 1, 1101 N_("Pack structure members together without holes") }, 1102 {"stack-check", &flag_stack_check, 1, 1103 N_("Insert stack checking code into the program") }, 1104 {"argument-alias", &flag_argument_noalias, 0, 1105 N_("Specify that arguments may alias each other & globals") }, 1106 {"argument-noalias", &flag_argument_noalias, 1, 1107 N_("Assume arguments may alias globals but not each other") }, 1108 {"argument-noalias-global", &flag_argument_noalias, 2, 1109 N_("Assume arguments do not alias each other or globals") }, 1110 {"strict-aliasing", &flag_strict_aliasing, 1, 1111 N_("Assume strict aliasing rules apply") }, 1112 {"align-loops", &align_loops, 0, 1113 N_("Align the start of loops") }, 1114 {"align-jumps", &align_jumps, 0, 1115 N_("Align labels which are only reached by jumping") }, 1116 {"align-labels", &align_labels, 0, 1117 N_("Align all labels") }, 1118 {"align-functions", &align_functions, 0, 1119 N_("Align the start of functions") }, 1120 {"merge-constants", &flag_merge_constants, 1, 1121 N_("Attempt to merge identical constants accross compilation units") }, 1122 {"merge-all-constants", &flag_merge_constants, 2, 1123 N_("Attempt to merge identical constants and constant variables") }, 1124 {"dump-unnumbered", &flag_dump_unnumbered, 1, 1125 N_("Suppress output of instruction numbers and line number notes in debugging dumps") }, 1126 {"instrument-functions", &flag_instrument_function_entry_exit, 1, 1127 N_("Instrument function entry/exit with profiling calls") }, 1128 {"ssa", &flag_ssa, 1, 1129 N_("Enable SSA optimizations") }, 1130 {"ssa-ccp", &flag_ssa_ccp, 1, 1131 N_("Enable SSA conditional constant propagation") }, 1132 {"ssa-dce", &flag_ssa_dce, 1, 1133 N_("Enable aggressive SSA dead code elimination") }, 1134 {"leading-underscore", &flag_leading_underscore, 1, 1135 N_("External symbols have a leading underscore") }, 1136 {"ident", &flag_no_ident, 0, 1137 N_("Process #ident directives") }, 1138 { "peephole2", &flag_peephole2, 1, 1139 N_("Enables an rtl peephole pass run before sched2") }, 1140 { "guess-branch-probability", &flag_guess_branch_prob, 1, 1141 N_("Enables guessing of branch probabilities") }, 1142 {"math-errno", &flag_errno_math, 1, 1143 N_("Set errno after built-in math functions") }, 1144 {"trapping-math", &flag_trapping_math, 1, 1145 N_("Floating-point operations can trap") }, 1146 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1, 1147 N_("Allow math optimizations that may violate IEEE or ANSI standards") }, 1148 {"bounded-pointers", &flag_bounded_pointers, 1, 1149 N_("Compile pointers as triples: value, base & end") }, 1150 {"bounds-check", &flag_bounds_check, 1, 1151 N_("Generate code to check bounds before dereferencing pointers and arrays") }, 1152 {"single-precision-constant", &flag_single_precision_constant, 1, 1153 N_("Convert floating point constant to single precision constant") }, 1154 {"time-report", &time_report, 1, 1155 N_("Report time taken by each compiler pass at end of run") }, 1156 {"mem-report", &mem_report, 1, 1157 N_("Report on permanent memory allocation at end of run") }, 1158 { "trapv", &flag_trapv, 1, 1159 N_("Trap for signed overflow in addition / subtraction / multiplication") }, 1160}; 1161 1162/* Table of language-specific options. */ 1163 1164static const struct lang_opt 1165{ 1166 const char *const option; 1167 const char *const description; 1168} 1169documented_lang_options[] = 1170{ 1171 /* In order not to overload the --help output, the convention 1172 used here is to only describe those options which are not 1173 enabled by default. */ 1174 1175 { "-ansi", 1176 N_("Compile just for ISO C89") }, 1177 { "-fallow-single-precision", 1178 N_("Do not promote floats to double if using -traditional") }, 1179 { "-std= ", 1180 N_("Determine language standard") }, 1181 1182 { "-fsigned-bitfields", "" }, 1183 { "-funsigned-bitfields", 1184 N_("Make bit-fields by unsigned by default") }, 1185 { "-fno-signed-bitfields", "" }, 1186 { "-fno-unsigned-bitfields","" }, 1187 { "-fsigned-char", 1188 N_("Make 'char' be signed by default") }, 1189 { "-funsigned-char", 1190 N_("Make 'char' be unsigned by default") }, 1191 { "-fno-signed-char", "" }, 1192 { "-fno-unsigned-char", "" }, 1193 1194 { "-ftraditional", "" }, 1195 { "-traditional", 1196 N_("Attempt to support traditional K&R style C") }, 1197 { "-fnotraditional", "" }, 1198 { "-fno-traditional", "" }, 1199 1200 { "-fasm", "" }, 1201 { "-fno-asm", 1202 N_("Do not recognize the 'asm' keyword") }, 1203 { "-fbuiltin", "" }, 1204 { "-fno-builtin", 1205 N_("Do not recognize any built in functions") }, 1206 { "-fhosted", 1207 N_("Assume normal C execution environment") }, 1208 { "-fno-hosted", "" }, 1209 { "-ffreestanding", 1210 N_("Assume that standard libraries & main might not exist") }, 1211 { "-fno-freestanding", "" }, 1212 { "-fcond-mismatch", 1213 N_("Allow different types as args of ? operator") }, 1214 { "-fno-cond-mismatch", "" }, 1215 { "-fdollars-in-identifiers", 1216 N_("Allow the use of $ inside identifiers") }, 1217 { "-fno-dollars-in-identifiers", "" }, 1218 { "-fpreprocessed", "" }, 1219 { "-fno-preprocessed", "" }, 1220 { "-fshort-double", 1221 N_("Use the same size for double as for float") }, 1222 { "-fno-short-double", "" }, 1223 { "-fshort-enums", 1224 N_("Use the smallest fitting integer to hold enums") }, 1225 { "-fno-short-enums", "" }, 1226 { "-fshort-wchar", 1227 N_("Override the underlying type for wchar_t to `unsigned short'") }, 1228 { "-fno-short-wchar", "" }, 1229 1230 { "-Wall", 1231 N_("Enable most warning messages") }, 1232 { "-Wbad-function-cast", 1233 N_("Warn about casting functions to incompatible types") }, 1234 { "-Wno-bad-function-cast", "" }, 1235 { "-Wno-missing-noreturn", "" }, 1236 { "-Wmissing-format-attribute", 1237 N_("Warn about functions which might be candidates for format attributes") }, 1238 { "-Wno-missing-format-attribute", "" }, 1239 { "-Wcast-qual", 1240 N_("Warn about casts which discard qualifiers") }, 1241 { "-Wno-cast-qual", "" }, 1242 { "-Wchar-subscripts", 1243 N_("Warn about subscripts whose type is 'char'") }, 1244 { "-Wno-char-subscripts", "" }, 1245 { "-Wcomment", 1246 N_("Warn if nested comments are detected") }, 1247 { "-Wno-comment", "" }, 1248 { "-Wcomments", 1249 N_("Warn if nested comments are detected") }, 1250 { "-Wno-comments", "" }, 1251 { "-Wconversion", 1252 N_("Warn about possibly confusing type conversions") }, 1253 { "-Wno-conversion", "" }, 1254 { "-Wformat", 1255 N_("Warn about printf/scanf/strftime/strfmon format anomalies") }, 1256 { "-Wno-format", "" }, 1257 { "-Wformat-y2k", "" }, 1258 { "-Wno-format-y2k", 1259 N_("Don't warn about strftime formats yielding 2 digit years") }, 1260 { "-Wformat-extra-args", "" }, 1261 { "-Wno-format-extra-args", 1262 N_("Don't warn about too many arguments to format functions") }, 1263 { "-Wformat-nonliteral", 1264 N_("Warn about non-string-literal format strings") }, 1265 { "-Wno-format-nonliteral", "" }, 1266 { "-Wformat-security", 1267 N_("Warn about possible security problems with format functions") }, 1268 { "-Wno-format-security", "" }, 1269 { "-Wimplicit-function-declaration", 1270 N_("Warn about implicit function declarations") }, 1271 { "-Wno-implicit-function-declaration", "" }, 1272 { "-Werror-implicit-function-declaration", "" }, 1273 { "-Wimplicit-int", 1274 N_("Warn when a declaration does not specify a type") }, 1275 { "-Wno-implicit-int", "" }, 1276 { "-Wimplicit", "" }, 1277 { "-Wno-implicit", "" }, 1278 { "-Wimport", 1279 N_("Warn about the use of the #import directive") }, 1280 { "-Wno-import", "" }, 1281 { "-Wlong-long","" }, 1282 { "-Wno-long-long", 1283 N_("Do not warn about using 'long long' when -pedantic") }, 1284 { "-Wmain", 1285 N_("Warn about suspicious declarations of main") }, 1286 { "-Wno-main", "" }, 1287 { "-Wmissing-braces", 1288 N_("Warn about possibly missing braces around initializers") }, 1289 { "-Wno-missing-braces", "" }, 1290 { "-Wmissing-declarations", 1291 N_("Warn about global funcs without previous declarations") }, 1292 { "-Wno-missing-declarations", "" }, 1293 { "-Wmissing-prototypes", 1294 N_("Warn about global funcs without prototypes") }, 1295 { "-Wno-missing-prototypes", "" }, 1296 { "-Wmultichar", 1297 N_("Warn about use of multicharacter literals") }, 1298 { "-Wno-multichar", "" }, 1299 { "-Wnested-externs", 1300 N_("Warn about externs not at file scope level") }, 1301 { "-Wno-nested-externs", "" }, 1302 { "-Wparentheses", 1303 N_("Warn about possible missing parentheses") }, 1304 { "-Wno-parentheses", "" }, 1305 { "-Wsequence-point", 1306 N_("Warn about possible violations of sequence point rules") }, 1307 { "-Wno-sequence-point", "" }, 1308 { "-Wpointer-arith", 1309 N_("Warn about function pointer arithmetic") }, 1310 { "-Wno-pointer-arith", "" }, 1311 { "-Wredundant-decls", 1312 N_("Warn about multiple declarations of the same object") }, 1313 { "-Wno-redundant-decls", "" }, 1314 { "-Wsign-compare", 1315 N_("Warn about signed/unsigned comparisons") }, 1316 { "-Wno-sign-compare", "" }, 1317 { "-Wfloat-equal", 1318 N_("Warn about testing equality of floating point numbers") }, 1319 { "-Wno-float-equal", "" }, 1320 { "-Wunknown-pragmas", 1321 N_("Warn about unrecognized pragmas") }, 1322 { "-Wno-unknown-pragmas", "" }, 1323 { "-Wstrict-prototypes", 1324 N_("Warn about non-prototyped function decls") }, 1325 { "-Wno-strict-prototypes", "" }, 1326 { "-Wtraditional", 1327 N_("Warn about constructs whose meaning change in ISO C") }, 1328 { "-Wno-traditional", "" }, 1329 { "-Wtrigraphs", 1330 N_("Warn when trigraphs are encountered") }, 1331 { "-Wno-trigraphs", "" }, 1332 { "-Wundef", "" }, 1333 { "-Wno-undef", "" }, 1334 { "-Wwrite-strings", 1335 N_("Mark strings as 'const char *'") }, 1336 { "-Wno-write-strings", "" }, 1337 1338#define DEFINE_LANG_NAME(NAME) { NULL, NAME }, 1339 1340#include "options.h" 1341 1342}; 1343 1344/* Here is a table, controlled by the tm.h file, listing each -m switch 1345 and which bits in `target_switches' it should set or clear. 1346 If VALUE is positive, it is bits to set. 1347 If VALUE is negative, -VALUE is bits to clear. 1348 (The sign bit is not used so there is no confusion.) */ 1349 1350static const struct 1351{ 1352 const char *const name; 1353 const int value; 1354 const char *const description; 1355} 1356target_switches [] = TARGET_SWITCHES; 1357 1358/* This table is similar, but allows the switch to have a value. */ 1359 1360#ifdef TARGET_OPTIONS 1361static const struct 1362{ 1363 const char *const prefix; 1364 const char **const variable; 1365 const char *const description; 1366} 1367target_options [] = TARGET_OPTIONS; 1368#endif 1369 1370/* Options controlling warnings. */ 1371 1372/* Don't print warning messages. -w. */ 1373 1374int inhibit_warnings = 0; 1375 1376/* Don't suppress warnings from system headers. -Wsystem-headers. */ 1377 1378int warn_system_headers = 0; 1379 1380/* Print various extra warnings. -W. */ 1381 1382int extra_warnings = 0; 1383 1384/* Treat warnings as errors. -Werror. */ 1385 1386int warnings_are_errors = 0; 1387 1388/* Nonzero to warn about unused variables, functions et.al. */ 1389 1390int warn_unused_function; 1391int warn_unused_label; 1392int warn_unused_parameter; 1393int warn_unused_variable; 1394int warn_unused_value; 1395 1396/* Nonzero to warn about code which is never reached. */ 1397 1398int warn_notreached; 1399 1400/* Nonzero to warn about variables used before they are initialized. */ 1401 1402int warn_uninitialized; 1403 1404/* Nonzero means warn about all declarations which shadow others. */ 1405 1406int warn_shadow; 1407 1408/* Warn if a switch on an enum fails to have a case for every enum value. */ 1409 1410int warn_switch; 1411 1412/* Nonzero means warn about function definitions that default the return type 1413 or that use a null return and have a return-type other than void. */ 1414 1415int warn_return_type; 1416 1417/* Nonzero means warn about pointer casts that increase the required 1418 alignment of the target type (and might therefore lead to a crash 1419 due to a misaligned access). */ 1420 1421int warn_cast_align; 1422 1423/* Nonzero means warn about any objects definitions whose size is larger 1424 than N bytes. Also want about function definitions whose returned 1425 values are larger than N bytes. The value N is in `larger_than_size'. */ 1426 1427int warn_larger_than; 1428HOST_WIDE_INT larger_than_size; 1429 1430/* Nonzero means warn if inline function is too large. */ 1431 1432int warn_inline; 1433 1434/* Warn if a function returns an aggregate, 1435 since there are often incompatible calling conventions for doing this. */ 1436 1437int warn_aggregate_return; 1438 1439/* Warn if packed attribute on struct is unnecessary and inefficient. */ 1440 1441int warn_packed; 1442 1443/* Warn when gcc pads a structure to an alignment boundary. */ 1444 1445int warn_padded; 1446 1447/* Warn when an optimization pass is disabled. */ 1448 1449int warn_disabled_optimization; 1450 1451/* Warn about functions which might be candidates for attribute noreturn. */ 1452 1453int warn_missing_noreturn; 1454 1455/* Nonzero means warn about uses of __attribute__((deprecated)) 1456 declarations. */ 1457 1458int warn_deprecated_decl = 1; 1459 1460/* Likewise for -W. */ 1461 1462static const lang_independent_options W_options[] = 1463{ 1464 {"unused-function", &warn_unused_function, 1, 1465 N_("Warn when a function is unused") }, 1466 {"unused-label", &warn_unused_label, 1, 1467 N_("Warn when a label is unused") }, 1468 {"unused-parameter", &warn_unused_parameter, 1, 1469 N_("Warn when a function parameter is unused") }, 1470 {"unused-variable", &warn_unused_variable, 1, 1471 N_("Warn when a variable is unused") }, 1472 {"unused-value", &warn_unused_value, 1, 1473 N_("Warn when an expression value is unused") }, 1474 {"system-headers", &warn_system_headers, 1, 1475 N_("Do not suppress warnings from system headers") }, 1476 {"error", &warnings_are_errors, 1, 1477 N_("Treat all warnings as errors") }, 1478 {"shadow", &warn_shadow, 1, 1479 N_("Warn when one local variable shadows another") }, 1480 {"switch", &warn_switch, 1, 1481 N_("Warn about enumerated switches missing a specific case") }, 1482 {"aggregate-return", &warn_aggregate_return, 1, 1483 N_("Warn about returning structures, unions or arrays") }, 1484 {"cast-align", &warn_cast_align, 1, 1485 N_("Warn about pointer casts which increase alignment") }, 1486 {"unreachable-code", &warn_notreached, 1, 1487 N_("Warn about code that will never be executed") }, 1488 {"uninitialized", &warn_uninitialized, 1, 1489 N_("Warn about uninitialized automatic variables") }, 1490 {"inline", &warn_inline, 1, 1491 N_("Warn when an inlined function cannot be inlined") }, 1492 {"packed", &warn_packed, 1, 1493 N_("Warn when the packed attribute has no effect on struct layout") }, 1494 {"padded", &warn_padded, 1, 1495 N_("Warn when padding is required to align struct members") }, 1496 {"disabled-optimization", &warn_disabled_optimization, 1, 1497 N_("Warn when an optimization pass is disabled") }, 1498 {"deprecated-declarations", &warn_deprecated_decl, 1, 1499 N_("Warn about uses of __attribute__((deprecated)) declarations") }, 1500 {"missing-noreturn", &warn_missing_noreturn, 1, 1501 N_("Warn about functions which might be candidates for attribute noreturn") } 1502}; 1503 1504void 1505set_Wunused (setting) 1506 int setting; 1507{ 1508 warn_unused_function = setting; 1509 warn_unused_label = setting; 1510 /* Unused function parameter warnings are reported when either ``-W 1511 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate 1512 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */ 1513 if (!setting) 1514 warn_unused_parameter = 0; 1515 else if (!warn_unused_parameter) 1516 warn_unused_parameter = -1; 1517 warn_unused_variable = setting; 1518 warn_unused_value = setting; 1519} 1520 1521/* The following routines are useful in setting all the flags that 1522 -ffast-math and -fno-fast-math imply. */ 1523 1524void 1525set_fast_math_flags () 1526{ 1527 flag_trapping_math = 0; 1528 flag_unsafe_math_optimizations = 1; 1529 flag_errno_math = 0; 1530} 1531 1532void 1533set_no_fast_math_flags () 1534{ 1535 flag_trapping_math = 1; 1536 flag_unsafe_math_optimizations = 0; 1537 flag_errno_math = 1; 1538} 1539 1540 1541/* Output files for assembler code (real compiler output) 1542 and debugging dumps. */ 1543 1544FILE *asm_out_file; 1545FILE *aux_info_file; 1546FILE *rtl_dump_file = NULL; 1547 1548/* Decode the string P as an integral parameter. 1549 If the string is indeed an integer return its numeric value else 1550 issue an Invalid Option error for the option PNAME and return DEFVAL. 1551 If PNAME is zero just return DEFVAL, do not call error. */ 1552 1553int 1554read_integral_parameter (p, pname, defval) 1555 const char *p; 1556 const char *pname; 1557 const int defval; 1558{ 1559 const char *endp = p; 1560 1561 while (*endp) 1562 { 1563 if (ISDIGIT (*endp)) 1564 endp++; 1565 else 1566 break; 1567 } 1568 1569 if (*endp != 0) 1570 { 1571 if (pname != 0) 1572 error ("invalid option `%s'", pname); 1573 return defval; 1574 } 1575 1576 return atoi (p); 1577} 1578 1579 1580/* This is the default decl_printable_name function. */ 1581 1582static const char * 1583decl_name (decl, verbosity) 1584 tree decl; 1585 int verbosity ATTRIBUTE_UNUSED; 1586{ 1587 return IDENTIFIER_POINTER (DECL_NAME (decl)); 1588} 1589 1590 1591/* This calls abort and is used to avoid problems when abort if a macro. 1592 It is used when we need to pass the address of abort. */ 1593 1594void 1595do_abort () 1596{ 1597 abort (); 1598} 1599 1600/* When `malloc.c' is compiled with `rcheck' defined, 1601 it calls this function to report clobberage. */ 1602 1603void 1604botch (s) 1605 const char *s ATTRIBUTE_UNUSED; 1606{ 1607 abort (); 1608} 1609 1610/* Return the logarithm of X, base 2, considering X unsigned, 1611 if X is a power of 2. Otherwise, returns -1. 1612 1613 This should be used via the `exact_log2' macro. */ 1614 1615int 1616exact_log2_wide (x) 1617 unsigned HOST_WIDE_INT x; 1618{ 1619 int log = 0; 1620 /* Test for 0 or a power of 2. */ 1621 if (x == 0 || x != (x & -x)) 1622 return -1; 1623 while ((x >>= 1) != 0) 1624 log++; 1625 return log; 1626} 1627 1628/* Given X, an unsigned number, return the largest int Y such that 2**Y <= X. 1629 If X is 0, return -1. 1630 1631 This should be used via the floor_log2 macro. */ 1632 1633int 1634floor_log2_wide (x) 1635 unsigned HOST_WIDE_INT x; 1636{ 1637 int log = -1; 1638 while (x != 0) 1639 log++, 1640 x >>= 1; 1641 return log; 1642} 1643 1644static int float_handler_set; 1645int float_handled; 1646jmp_buf float_handler; 1647 1648/* Signals actually come here. */ 1649 1650static void 1651float_signal (signo) 1652 /* If this is missing, some compilers complain. */ 1653 int signo ATTRIBUTE_UNUSED; 1654{ 1655 if (float_handled == 0) 1656 crash_signal (signo); 1657 float_handled = 0; 1658 1659 /* On System-V derived systems, we must reinstall the signal handler. 1660 This is harmless on BSD-derived systems. */ 1661 signal (SIGFPE, float_signal); 1662 longjmp (float_handler, 1); 1663} 1664 1665/* Specify where to longjmp to when a floating arithmetic error happens. 1666 If HANDLER is 0, it means don't handle the errors any more. */ 1667 1668static void 1669set_float_handler (handler) 1670 jmp_buf handler; 1671{ 1672 float_handled = (handler != 0); 1673 if (handler) 1674 memcpy (float_handler, handler, sizeof (float_handler)); 1675 1676 if (float_handled && ! float_handler_set) 1677 { 1678 signal (SIGFPE, float_signal); 1679 float_handler_set = 1; 1680 } 1681} 1682 1683/* This is a wrapper function for code which might elicit an 1684 arithmetic exception. That code should be passed in as a function 1685 pointer FN, and one argument DATA. DATA is usually a struct which 1686 contains the real input and output for function FN. This function 1687 returns 0 (failure) if longjmp was called (i.e. an exception 1688 occurred.) It returns 1 (success) otherwise. */ 1689 1690int 1691do_float_handler (fn, data) 1692 void (*fn) PARAMS ((PTR)); 1693 PTR data; 1694{ 1695 jmp_buf buf; 1696 1697 if (setjmp (buf)) 1698 { 1699 /* We got here via longjmp () caused by an exception in function 1700 fn (). */ 1701 set_float_handler (NULL); 1702 return 0; 1703 } 1704 1705 set_float_handler (buf); 1706 (*fn)(data); 1707 set_float_handler (NULL); 1708 return 1; 1709} 1710 1711/* Handler for fatal signals, such as SIGSEGV. These are transformed 1712 into ICE messages, which is much more user friendly. */ 1713 1714static void 1715crash_signal (signo) 1716 int signo; 1717{ 1718 internal_error ("internal error: %s", strsignal (signo)); 1719} 1720 1721/* Strip off a legitimate source ending from the input string NAME of 1722 length LEN. Rather than having to know the names used by all of 1723 our front ends, we strip off an ending of a period followed by 1724 up to five characters. (Java uses ".class".) */ 1725 1726void 1727strip_off_ending (name, len) 1728 char *name; 1729 int len; 1730{ 1731 int i; 1732 for (i = 2; i < 6 && len > i; i++) 1733 { 1734 if (name[len - i] == '.') 1735 { 1736 name[len - i] = '\0'; 1737 break; 1738 } 1739 } 1740} 1741 1742/* Output a quoted string. */ 1743 1744void 1745output_quoted_string (asm_file, string) 1746 FILE *asm_file; 1747 const char *string; 1748{ 1749#ifdef OUTPUT_QUOTED_STRING 1750 OUTPUT_QUOTED_STRING (asm_file, string); 1751#else 1752 char c; 1753 1754 putc ('\"', asm_file); 1755 while ((c = *string++) != 0) 1756 { 1757 if (ISPRINT (c)) 1758 { 1759 if (c == '\"' || c == '\\') 1760 putc ('\\', asm_file); 1761 putc (c, asm_file); 1762 } 1763 else 1764 fprintf (asm_file, "\\%03o", c); 1765 } 1766 putc ('\"', asm_file); 1767#endif 1768} 1769 1770/* Output a file name in the form wanted by System V. */ 1771 1772void 1773output_file_directive (asm_file, input_name) 1774 FILE *asm_file; 1775 const char *input_name; 1776{ 1777 int len = strlen (input_name); 1778 const char *na = input_name + len; 1779 1780 /* NA gets INPUT_NAME sans directory names. */ 1781 while (na > input_name) 1782 { 1783 if (IS_DIR_SEPARATOR (na[-1])) 1784 break; 1785 na--; 1786 } 1787 1788#ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME 1789 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na); 1790#else 1791#ifdef ASM_OUTPUT_SOURCE_FILENAME 1792 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na); 1793#else 1794 fprintf (asm_file, "\t.file\t"); 1795 output_quoted_string (asm_file, na); 1796 fputc ('\n', asm_file); 1797#endif 1798#endif 1799} 1800 1801/* Routine to open a dump file. Return true if the dump file is enabled. */ 1802 1803static int 1804open_dump_file (index, decl) 1805 enum dump_file_index index; 1806 tree decl; 1807{ 1808 char *dump_name; 1809 const char *open_arg; 1810 char seq[16]; 1811 1812 if (! dump_file[index].enabled) 1813 return 0; 1814 1815 timevar_push (TV_DUMP); 1816 if (rtl_dump_file != NULL) 1817 fclose (rtl_dump_file); 1818 1819 sprintf (seq, DUMPFILE_FORMAT, index); 1820 1821 if (! dump_file[index].initialized) 1822 { 1823 /* If we've not initialized the files, do so now. */ 1824 if (graph_dump_format != no_graph 1825 && dump_file[index].graph_dump_p) 1826 { 1827 dump_name = concat (seq, dump_file[index].extension, NULL); 1828 clean_graph_dump_file (dump_base_name, dump_name); 1829 free (dump_name); 1830 } 1831 dump_file[index].initialized = 1; 1832 open_arg = "w"; 1833 } 1834 else 1835 open_arg = "a"; 1836 1837 dump_name = concat (dump_base_name, seq, 1838 dump_file[index].extension, NULL); 1839 1840 rtl_dump_file = fopen (dump_name, open_arg); 1841 if (rtl_dump_file == NULL) 1842 fatal_io_error ("can't open %s", dump_name); 1843 1844 free (dump_name); 1845 1846 if (decl) 1847 fprintf (rtl_dump_file, "\n;; Function %s\n\n", 1848 decl_printable_name (decl, 2)); 1849 1850 timevar_pop (TV_DUMP); 1851 return 1; 1852} 1853 1854/* Routine to close a dump file. */ 1855 1856static void 1857close_dump_file (index, func, insns) 1858 enum dump_file_index index; 1859 void (*func) PARAMS ((FILE *, rtx)); 1860 rtx insns; 1861{ 1862 if (! rtl_dump_file) 1863 return; 1864 1865 timevar_push (TV_DUMP); 1866 if (insns 1867 && graph_dump_format != no_graph 1868 && dump_file[index].graph_dump_p) 1869 { 1870 char seq[16]; 1871 char *suffix; 1872 1873 sprintf (seq, DUMPFILE_FORMAT, index); 1874 suffix = concat (seq, dump_file[index].extension, NULL); 1875 print_rtl_graph_with_bb (dump_base_name, suffix, insns); 1876 free (suffix); 1877 } 1878 1879 if (func && insns) 1880 func (rtl_dump_file, insns); 1881 1882 fflush (rtl_dump_file); 1883 fclose (rtl_dump_file); 1884 1885 rtl_dump_file = NULL; 1886 timevar_pop (TV_DUMP); 1887} 1888 1889/* Do any final processing required for the declarations in VEC, of 1890 which there are LEN. We write out inline functions and variables 1891 that have been deferred until this point, but which are required. 1892 Returns non-zero if anything was put out. */ 1893 1894int 1895wrapup_global_declarations (vec, len) 1896 tree *vec; 1897 int len; 1898{ 1899 tree decl; 1900 int i; 1901 int reconsider; 1902 int output_something = 0; 1903 1904 for (i = 0; i < len; i++) 1905 { 1906 decl = vec[i]; 1907 1908 /* We're not deferring this any longer. */ 1909 DECL_DEFER_OUTPUT (decl) = 0; 1910 1911 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0 1912 && incomplete_decl_finalize_hook != 0) 1913 (*incomplete_decl_finalize_hook) (decl); 1914 } 1915 1916 /* Now emit any global variables or functions that we have been 1917 putting off. We need to loop in case one of the things emitted 1918 here references another one which comes earlier in the list. */ 1919 do 1920 { 1921 reconsider = 0; 1922 for (i = 0; i < len; i++) 1923 { 1924 decl = vec[i]; 1925 1926 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl)) 1927 continue; 1928 1929 /* Don't write out static consts, unless we still need them. 1930 1931 We also keep static consts if not optimizing (for debugging), 1932 unless the user specified -fno-keep-static-consts. 1933 ??? They might be better written into the debug information. 1934 This is possible when using DWARF. 1935 1936 A language processor that wants static constants to be always 1937 written out (even if it is not used) is responsible for 1938 calling rest_of_decl_compilation itself. E.g. the C front-end 1939 calls rest_of_decl_compilation from finish_decl. 1940 One motivation for this is that is conventional in some 1941 environments to write things like: 1942 static const char rcsid[] = "... version string ..."; 1943 intending to force the string to be in the executable. 1944 1945 A language processor that would prefer to have unneeded 1946 static constants "optimized away" would just defer writing 1947 them out until here. E.g. C++ does this, because static 1948 constants are often defined in header files. 1949 1950 ??? A tempting alternative (for both C and C++) would be 1951 to force a constant to be written if and only if it is 1952 defined in a main file, as opposed to an include file. */ 1953 1954 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)) 1955 { 1956 bool needed = 1; 1957 1958 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))) 1959 /* needed */; 1960 else if (DECL_COMDAT (decl)) 1961 needed = 0; 1962 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl) 1963 && (optimize || !flag_keep_static_consts 1964 || DECL_ARTIFICIAL (decl))) 1965 needed = 0; 1966 1967 if (needed) 1968 { 1969 reconsider = 1; 1970 rest_of_decl_compilation (decl, NULL, 1, 1); 1971 } 1972 } 1973 1974 if (TREE_CODE (decl) == FUNCTION_DECL 1975 && DECL_INITIAL (decl) != 0 1976 && DECL_SAVED_INSNS (decl) != 0 1977 && (flag_keep_inline_functions 1978 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl)) 1979 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))) 1980 { 1981 reconsider = 1; 1982 output_inline_function (decl); 1983 } 1984 } 1985 1986 if (reconsider) 1987 output_something = 1; 1988 } 1989 while (reconsider); 1990 1991 return output_something; 1992} 1993 1994/* Issue appropriate warnings for the global declarations in VEC (of 1995 which there are LEN). Output debugging information for them. */ 1996 1997void 1998check_global_declarations (vec, len) 1999 tree *vec; 2000 int len; 2001{ 2002 tree decl; 2003 int i; 2004 2005 for (i = 0; i < len; i++) 2006 { 2007 decl = vec[i]; 2008 2009 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl) 2010 && ! TREE_ASM_WRITTEN (decl)) 2011 /* Cancel the RTL for this decl so that, if debugging info 2012 output for global variables is still to come, 2013 this one will be omitted. */ 2014 SET_DECL_RTL (decl, NULL_RTX); 2015 2016 /* Warn about any function 2017 declared static but not defined. 2018 We don't warn about variables, 2019 because many programs have static variables 2020 that exist only to get some text into the object file. */ 2021 if (TREE_CODE (decl) == FUNCTION_DECL 2022 && (warn_unused_function 2023 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))) 2024 && DECL_INITIAL (decl) == 0 2025 && DECL_EXTERNAL (decl) 2026 && ! DECL_ARTIFICIAL (decl) 2027 && ! TREE_PUBLIC (decl)) 2028 { 2029 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))) 2030 pedwarn_with_decl (decl, 2031 "`%s' used but never defined"); 2032 else 2033 warning_with_decl (decl, 2034 "`%s' declared `static' but never defined"); 2035 /* This symbol is effectively an "extern" declaration now. */ 2036 TREE_PUBLIC (decl) = 1; 2037 assemble_external (decl); 2038 } 2039 2040 /* Warn about static fns or vars defined but not used, 2041 but not about inline functions or static consts 2042 since defining those in header files is normal practice. */ 2043 if (((warn_unused_function 2044 && TREE_CODE (decl) == FUNCTION_DECL && ! DECL_INLINE (decl)) 2045 || (warn_unused_variable 2046 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl))) 2047 && ! DECL_IN_SYSTEM_HEADER (decl) 2048 && ! DECL_EXTERNAL (decl) 2049 && ! TREE_PUBLIC (decl) 2050 && ! TREE_USED (decl) 2051 && (TREE_CODE (decl) == FUNCTION_DECL || ! DECL_REGISTER (decl)) 2052 /* The TREE_USED bit for file-scope decls 2053 is kept in the identifier, to handle multiple 2054 external decls in different scopes. */ 2055 && ! TREE_USED (DECL_NAME (decl))) 2056 warning_with_decl (decl, "`%s' defined but not used"); 2057 2058 timevar_push (TV_SYMOUT); 2059 (*debug_hooks->global_decl) (decl); 2060 timevar_pop (TV_SYMOUT); 2061 } 2062} 2063 2064/* Save the current INPUT_FILENAME and LINENO on the top entry in the 2065 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the 2066 INPUT_FILENAME and LINENO accordingly. */ 2067 2068void 2069push_srcloc (file, line) 2070 const char *file; 2071 int line; 2072{ 2073 struct file_stack *fs; 2074 2075 if (input_file_stack) 2076 { 2077 input_file_stack->name = input_filename; 2078 input_file_stack->line = lineno; 2079 } 2080 2081 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack)); 2082 fs->name = input_filename = file; 2083 fs->line = lineno = line; 2084 fs->indent_level = 0; 2085 fs->next = input_file_stack; 2086 input_file_stack = fs; 2087 input_file_stack_tick++; 2088} 2089 2090/* Pop the top entry off the stack of presently open source files. 2091 Restore the INPUT_FILENAME and LINENO from the new topmost entry on 2092 the stack. */ 2093 2094void 2095pop_srcloc () 2096{ 2097 struct file_stack *fs; 2098 2099 fs = input_file_stack; 2100 input_file_stack = fs->next; 2101 free (fs); 2102 input_file_stack_tick++; 2103 /* The initial source file is never popped. */ 2104 if (!input_file_stack) 2105 abort (); 2106 input_filename = input_file_stack->name; 2107 lineno = input_file_stack->line; 2108} 2109 2110/* Compile an entire translation unit. Write a file of assembly 2111 output and various debugging dumps. */ 2112 2113static void 2114compile_file () 2115{ 2116 tree globals; 2117 2118 /* Initialize yet another pass. */ 2119 2120 init_final (main_input_filename); 2121 init_branch_prob (dump_base_name); 2122 2123 timevar_push (TV_PARSE); 2124 2125 /* Call the parser, which parses the entire file 2126 (calling rest_of_compilation for each function). */ 2127 yyparse (); 2128 2129 /* In case there were missing block closers, 2130 get us back to the global binding level. */ 2131 (*lang_hooks.clear_binding_stack) (); 2132 2133 /* Compilation is now finished except for writing 2134 what's left of the symbol table output. */ 2135 2136 timevar_pop (TV_PARSE); 2137 2138 if (flag_syntax_only) 2139 return; 2140 2141 globals = getdecls (); 2142 2143 /* Really define vars that have had only a tentative definition. 2144 Really output inline functions that must actually be callable 2145 and have not been output so far. */ 2146 2147 { 2148 int len = list_length (globals); 2149 tree *vec = (tree *) xmalloc (sizeof (tree) * len); 2150 int i; 2151 tree decl; 2152 2153 /* Process the decls in reverse order--earliest first. 2154 Put them into VEC from back to front, then take out from front. */ 2155 2156 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl)) 2157 vec[len - i - 1] = decl; 2158 2159 wrapup_global_declarations (vec, len); 2160 2161 /* This must occur after the loop to output deferred functions. Else 2162 the profiler initializer would not be emitted if all the functions 2163 in this compilation unit were deferred. 2164 2165 output_func_start_profiler can not cause any additional functions or 2166 data to need to be output, so it need not be in the deferred function 2167 loop above. */ 2168 output_func_start_profiler (); 2169 2170 check_global_declarations (vec, len); 2171 2172 /* Clean up. */ 2173 free (vec); 2174 } 2175 2176 /* Write out any pending weak symbol declarations. */ 2177 2178 weak_finish (); 2179 2180 /* Do dbx symbols. */ 2181 timevar_push (TV_SYMOUT); 2182 2183#ifdef DWARF2_UNWIND_INFO 2184 if (dwarf2out_do_frame ()) 2185 dwarf2out_frame_finish (); 2186#endif 2187 2188 (*debug_hooks->finish) (main_input_filename); 2189 timevar_pop (TV_SYMOUT); 2190 2191 /* Output some stuff at end of file if nec. */ 2192 2193 dw2_output_indirect_constants (); 2194 2195 end_final (dump_base_name); 2196 2197 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities) 2198 { 2199 timevar_push (TV_DUMP); 2200 open_dump_file (DFI_bp, NULL); 2201 2202 end_branch_prob (); 2203 2204 close_dump_file (DFI_bp, NULL, NULL_RTX); 2205 timevar_pop (TV_DUMP); 2206 } 2207 2208#ifdef ASM_FILE_END 2209 ASM_FILE_END (asm_out_file); 2210#endif 2211 2212 /* Attach a special .ident directive to the end of the file to identify 2213 the version of GCC which compiled this code. The format of the .ident 2214 string is patterned after the ones produced by native SVR4 compilers. */ 2215#ifdef IDENT_ASM_OP 2216 if (!flag_no_ident) 2217 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n", 2218 IDENT_ASM_OP, version_string); 2219#endif 2220 2221 if (optimize > 0 && open_dump_file (DFI_combine, NULL)) 2222 { 2223 timevar_push (TV_DUMP); 2224 dump_combine_total_stats (rtl_dump_file); 2225 close_dump_file (DFI_combine, NULL, NULL_RTX); 2226 timevar_pop (TV_DUMP); 2227 } 2228} 2229 2230/* This is called from various places for FUNCTION_DECL, VAR_DECL, 2231 and TYPE_DECL nodes. 2232 2233 This does nothing for local (non-static) variables, unless the 2234 variable is a register variable with an ASMSPEC. In that case, or 2235 if the variable is not an automatic, it sets up the RTL and 2236 outputs any assembler code (label definition, storage allocation 2237 and initialization). 2238 2239 DECL is the declaration. If ASMSPEC is nonzero, it specifies 2240 the assembler symbol name to be used. TOP_LEVEL is nonzero 2241 if this declaration is not within a function. */ 2242 2243void 2244rest_of_decl_compilation (decl, asmspec, top_level, at_end) 2245 tree decl; 2246 const char *asmspec; 2247 int top_level; 2248 int at_end; 2249{ 2250 /* Declarations of variables, and of functions defined elsewhere. */ 2251 2252/* The most obvious approach, to put an #ifndef around where 2253 this macro is used, doesn't work since it's inside a macro call. */ 2254#ifndef ASM_FINISH_DECLARE_OBJECT 2255#define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END) 2256#endif 2257 2258 /* Forward declarations for nested functions are not "external", 2259 but we need to treat them as if they were. */ 2260 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl) 2261 || TREE_CODE (decl) == FUNCTION_DECL) 2262 { 2263 timevar_push (TV_VARCONST); 2264 if (asmspec) 2265 make_decl_rtl (decl, asmspec); 2266 /* Don't output anything 2267 when a tentative file-scope definition is seen. 2268 But at end of compilation, do output code for them. */ 2269 if (at_end || !DECL_DEFER_OUTPUT (decl)) 2270 assemble_variable (decl, top_level, at_end, 0); 2271 if (decl == last_assemble_variable_decl) 2272 { 2273 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl, 2274 top_level, at_end); 2275 } 2276 timevar_pop (TV_VARCONST); 2277 } 2278 else if (DECL_REGISTER (decl) && asmspec != 0) 2279 { 2280 if (decode_reg_name (asmspec) >= 0) 2281 { 2282 SET_DECL_RTL (decl, NULL_RTX); 2283 make_decl_rtl (decl, asmspec); 2284 } 2285 else 2286 { 2287 error ("invalid register name `%s' for register variable", asmspec); 2288 DECL_REGISTER (decl) = 0; 2289 if (!top_level) 2290 expand_decl (decl); 2291 } 2292 } 2293#if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) 2294 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG) 2295 && TREE_CODE (decl) == TYPE_DECL) 2296 { 2297 timevar_push (TV_SYMOUT); 2298 dbxout_symbol (decl, 0); 2299 timevar_pop (TV_SYMOUT); 2300 } 2301#endif 2302#ifdef SDB_DEBUGGING_INFO 2303 else if (write_symbols == SDB_DEBUG && top_level 2304 && TREE_CODE (decl) == TYPE_DECL) 2305 { 2306 timevar_push (TV_SYMOUT); 2307 sdbout_symbol (decl, 0); 2308 timevar_pop (TV_SYMOUT); 2309 } 2310#endif 2311} 2312 2313/* Called after finishing a record, union or enumeral type. */ 2314 2315void 2316rest_of_type_compilation (type, toplev) 2317#if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO) 2318 tree type; 2319 int toplev; 2320#else 2321 tree type ATTRIBUTE_UNUSED; 2322 int toplev ATTRIBUTE_UNUSED; 2323#endif 2324{ 2325 timevar_push (TV_SYMOUT); 2326#if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) 2327 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG) 2328 dbxout_symbol (TYPE_STUB_DECL (type), !toplev); 2329#endif 2330#ifdef SDB_DEBUGGING_INFO 2331 if (write_symbols == SDB_DEBUG) 2332 sdbout_symbol (TYPE_STUB_DECL (type), !toplev); 2333#endif 2334#ifdef DWARF2_DEBUGGING_INFO 2335 if ((write_symbols == DWARF2_DEBUG 2336 || write_symbols == VMS_AND_DWARF2_DEBUG) 2337 && toplev) 2338 dwarf2out_decl (TYPE_STUB_DECL (type)); 2339#endif 2340 timevar_pop (TV_SYMOUT); 2341} 2342 2343/* This is called from finish_function (within yyparse) 2344 after each top-level definition is parsed. 2345 It is supposed to compile that function or variable 2346 and output the assembler code for it. 2347 After we return, the tree storage is freed. */ 2348 2349void 2350rest_of_compilation (decl) 2351 tree decl; 2352{ 2353 rtx insns; 2354 int tem; 2355 int failure = 0; 2356 int rebuild_label_notes_after_reload; 2357 int register_life_up_to_date; 2358 int cleanup_crossjump; 2359 2360 timevar_push (TV_REST_OF_COMPILATION); 2361 2362 /* Now that we're out of the frontend, we shouldn't have any more 2363 CONCATs anywhere. */ 2364 generating_concat_p = 0; 2365 2366 /* When processing delayed functions, prepare_function_start() won't 2367 have been run to re-initialize it. */ 2368 cse_not_expected = ! optimize; 2369 2370 /* First, make sure that NOTE_BLOCK is set correctly for each 2371 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */ 2372 if (!cfun->x_whole_function_mode_p) 2373 identify_blocks (); 2374 2375 /* In function-at-a-time mode, we do not attempt to keep the BLOCK 2376 tree in sensible shape. So, we just recalculate it here. */ 2377 if (cfun->x_whole_function_mode_p) 2378 reorder_blocks (); 2379 2380 init_flow (); 2381 2382 /* If we are reconsidering an inline function 2383 at the end of compilation, skip the stuff for making it inline. */ 2384 2385 if (DECL_SAVED_INSNS (decl) == 0) 2386 { 2387 int inlinable = 0; 2388 tree parent; 2389 const char *lose; 2390 2391 /* If this is nested inside an inlined external function, pretend 2392 it was only declared. Since we cannot inline such functions, 2393 generating code for this one is not only not necessary but will 2394 confuse some debugging output writers. */ 2395 for (parent = DECL_CONTEXT (current_function_decl); 2396 parent != NULL_TREE; 2397 parent = get_containing_scope (parent)) 2398 if (TREE_CODE (parent) == FUNCTION_DECL 2399 && DECL_INLINE (parent) && DECL_EXTERNAL (parent)) 2400 { 2401 DECL_INITIAL (decl) = 0; 2402 goto exit_rest_of_compilation; 2403 } 2404 2405 /* If requested, consider whether to make this function inline. */ 2406 if ((DECL_INLINE (decl) && !flag_no_inline) 2407 || flag_inline_functions) 2408 { 2409 timevar_push (TV_INTEGRATION); 2410 lose = function_cannot_inline_p (decl); 2411 timevar_pop (TV_INTEGRATION); 2412 if (lose || ! optimize) 2413 { 2414 if (warn_inline && DECL_INLINE (decl)) 2415 warning_with_decl (decl, lose); 2416 DECL_ABSTRACT_ORIGIN (decl) = 0; 2417 /* Don't really compile an extern inline function. 2418 If we can't make it inline, pretend 2419 it was only declared. */ 2420 if (DECL_EXTERNAL (decl)) 2421 { 2422 DECL_INITIAL (decl) = 0; 2423 goto exit_rest_of_compilation; 2424 } 2425 } 2426 else 2427 /* ??? Note that this has the effect of making it look 2428 like "inline" was specified for a function if we choose 2429 to inline it. This isn't quite right, but it's 2430 probably not worth the trouble to fix. */ 2431 inlinable = DECL_INLINE (decl) = 1; 2432 } 2433 2434 insns = get_insns (); 2435 2436 /* Dump the rtl code if we are dumping rtl. */ 2437 2438 if (open_dump_file (DFI_rtl, decl)) 2439 { 2440 if (DECL_SAVED_INSNS (decl)) 2441 fprintf (rtl_dump_file, ";; (integrable)\n\n"); 2442 close_dump_file (DFI_rtl, print_rtl, insns); 2443 } 2444 2445 /* Convert from NOTE_INSN_EH_REGION style notes, and do other 2446 sorts of eh initialization. Delay this until after the 2447 initial rtl dump so that we can see the original nesting. */ 2448 convert_from_eh_region_ranges (); 2449 2450 /* If function is inline, and we don't yet know whether to 2451 compile it by itself, defer decision till end of compilation. 2452 finish_compilation will call rest_of_compilation again 2453 for those functions that need to be output. Also defer those 2454 functions that we are supposed to defer. */ 2455 2456 if (inlinable 2457 || (DECL_INLINE (decl) 2458 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl) 2459 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) 2460 && ! flag_keep_inline_functions) 2461 || DECL_EXTERNAL (decl)))) 2462 DECL_DEFER_OUTPUT (decl) = 1; 2463 2464 if (DECL_INLINE (decl)) 2465 /* DWARF wants separate debugging info for abstract and 2466 concrete instances of all inline functions, including those 2467 declared inline but not inlined, and those inlined even 2468 though they weren't declared inline. Conveniently, that's 2469 what DECL_INLINE means at this point. */ 2470 (*debug_hooks->deferred_inline_function) (decl); 2471 2472 if (DECL_DEFER_OUTPUT (decl)) 2473 { 2474 /* If -Wreturn-type, we have to do a bit of compilation. We just 2475 want to call cleanup the cfg to figure out whether or not we can 2476 fall off the end of the function; we do the minimum amount of 2477 work necessary to make that safe. */ 2478 if (warn_return_type) 2479 { 2480 int saved_optimize = optimize; 2481 2482 optimize = 0; 2483 rebuild_jump_labels (insns); 2484 find_exception_handler_labels (); 2485 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2486 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP); 2487 optimize = saved_optimize; 2488 2489 /* CFG is no longer maintained up-to-date. */ 2490 free_bb_for_insn (); 2491 } 2492 2493 current_function_nothrow = nothrow_function_p (); 2494 if (current_function_nothrow) 2495 /* Now we know that this can't throw; set the flag for the benefit 2496 of other functions later in this translation unit. */ 2497 TREE_NOTHROW (current_function_decl) = 1; 2498 2499 timevar_push (TV_INTEGRATION); 2500 save_for_inline (decl); 2501 timevar_pop (TV_INTEGRATION); 2502 DECL_SAVED_INSNS (decl)->inlinable = inlinable; 2503 goto exit_rest_of_compilation; 2504 } 2505 2506 /* If specified extern inline but we aren't inlining it, we are 2507 done. This goes for anything that gets here with DECL_EXTERNAL 2508 set, not just things with DECL_INLINE. */ 2509 if (DECL_EXTERNAL (decl)) 2510 goto exit_rest_of_compilation; 2511 } 2512 2513 /* If we're emitting a nested function, make sure its parent gets 2514 emitted as well. Doing otherwise confuses debug info. */ 2515 { 2516 tree parent; 2517 for (parent = DECL_CONTEXT (current_function_decl); 2518 parent != NULL_TREE; 2519 parent = get_containing_scope (parent)) 2520 if (TREE_CODE (parent) == FUNCTION_DECL) 2521 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1; 2522 } 2523 2524 /* We are now committed to emitting code for this function. Do any 2525 preparation, such as emitting abstract debug info for the inline 2526 before it gets mangled by optimization. */ 2527 if (DECL_INLINE (decl)) 2528 (*debug_hooks->outlining_inline_function) (decl); 2529 2530 /* Remove any notes we don't need. That will make iterating 2531 over the instruction sequence faster, and allow the garbage 2532 collector to reclaim the memory used by the notes. */ 2533 remove_unnecessary_notes (); 2534 reorder_blocks (); 2535 2536 ggc_collect (); 2537 2538 /* Initialize some variables used by the optimizers. */ 2539 init_function_for_compilation (); 2540 2541 if (! DECL_DEFER_OUTPUT (decl)) 2542 TREE_ASM_WRITTEN (decl) = 1; 2543 2544 /* Now that integrate will no longer see our rtl, we need not 2545 distinguish between the return value of this function and the 2546 return value of called functions. Also, we can remove all SETs 2547 of subregs of hard registers; they are only here because of 2548 integrate. Also, we can now initialize pseudos intended to 2549 carry magic hard reg data throughout the function. */ 2550 rtx_equal_function_value_matters = 0; 2551 purge_hard_subreg_sets (get_insns ()); 2552 2553 /* Early return if there were errors. We can run afoul of our 2554 consistency checks, and there's not really much point in fixing them. 2555 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */ 2556 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type) 2557 || errorcount || sorrycount) 2558 goto exit_rest_of_compilation; 2559 2560 /* We may have potential sibling or tail recursion sites. Select one 2561 (of possibly multiple) methods of performing the call. */ 2562 if (flag_optimize_sibling_calls) 2563 { 2564 timevar_push (TV_JUMP); 2565 open_dump_file (DFI_sibling, decl); 2566 2567 optimize_sibling_and_tail_recursive_calls (); 2568 2569 close_dump_file (DFI_sibling, print_rtl, get_insns ()); 2570 timevar_pop (TV_JUMP); 2571 } 2572 2573 /* Complete generation of exception handling code. */ 2574 find_exception_handler_labels (); 2575 if (doing_eh (0)) 2576 { 2577 timevar_push (TV_JUMP); 2578 open_dump_file (DFI_eh, decl); 2579 2580 finish_eh_generation (); 2581 2582 close_dump_file (DFI_eh, print_rtl, get_insns ()); 2583 timevar_pop (TV_JUMP); 2584 } 2585 2586 /* Delay emitting hard_reg_initial_value sets until after EH landing pad 2587 generation, which might create new sets. */ 2588 emit_initial_value_sets (); 2589 2590#ifdef FINALIZE_PIC 2591 /* If we are doing position-independent code generation, now 2592 is the time to output special prologues and epilogues. 2593 We do not want to do this earlier, because it just clutters 2594 up inline functions with meaningless insns. */ 2595 if (flag_pic) 2596 FINALIZE_PIC; 2597#endif 2598 2599 insns = get_insns (); 2600 2601 /* Copy any shared structure that should not be shared. */ 2602 unshare_all_rtl (current_function_decl, insns); 2603 2604#ifdef SETJMP_VIA_SAVE_AREA 2605 /* This must be performed before virtual register instantiation. */ 2606 if (current_function_calls_alloca) 2607 optimize_save_area_alloca (insns); 2608#endif 2609 2610 /* Instantiate all virtual registers. */ 2611 instantiate_virtual_regs (current_function_decl, insns); 2612 2613 open_dump_file (DFI_jump, decl); 2614 2615 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields 2616 are initialized and to compute whether control can drop off the end 2617 of the function. */ 2618 2619 timevar_push (TV_JUMP); 2620 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this 2621 before jump optimization switches branch directions. */ 2622 expected_value_to_br_prob (); 2623 2624 reg_scan (insns, max_reg_num (), 0); 2625 rebuild_jump_labels (insns); 2626 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2627 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP); 2628 2629 /* CFG is no longer maintained up-to-date. */ 2630 free_bb_for_insn (); 2631 copy_loop_headers (insns); 2632 purge_line_number_notes (insns); 2633 2634 timevar_pop (TV_JUMP); 2635 2636 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */ 2637 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl)) 2638 { 2639 close_dump_file (DFI_jump, print_rtl, insns); 2640 goto exit_rest_of_compilation; 2641 } 2642 2643 /* Long term, this should probably move before the jump optimizer too, 2644 but I didn't want to disturb the rtl_dump_and_exit and related 2645 stuff at this time. */ 2646 if (optimize > 0 && flag_ssa) 2647 { 2648 /* Convert to SSA form. */ 2649 2650 timevar_push (TV_TO_SSA); 2651 open_dump_file (DFI_ssa, decl); 2652 2653 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2654 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP); 2655 convert_to_ssa (); 2656 2657 close_dump_file (DFI_ssa, print_rtl_with_bb, insns); 2658 timevar_pop (TV_TO_SSA); 2659 2660 /* Perform sparse conditional constant propagation, if requested. */ 2661 if (flag_ssa_ccp) 2662 { 2663 timevar_push (TV_SSA_CCP); 2664 open_dump_file (DFI_ssa_ccp, decl); 2665 2666 ssa_const_prop (); 2667 2668 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ()); 2669 timevar_pop (TV_SSA_CCP); 2670 } 2671 2672 /* It would be useful to cleanup the CFG at this point, but block 2673 merging and possibly other transformations might leave a PHI 2674 node in the middle of a basic block, which is a strict no-no. */ 2675 2676 /* The SSA implementation uses basic block numbers in its phi 2677 nodes. Thus, changing the control-flow graph or the basic 2678 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (), 2679 may cause problems. */ 2680 2681 if (flag_ssa_dce) 2682 { 2683 /* Remove dead code. */ 2684 2685 timevar_push (TV_SSA_DCE); 2686 open_dump_file (DFI_ssa_dce, decl); 2687 2688 insns = get_insns (); 2689 ssa_eliminate_dead_code(); 2690 2691 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns); 2692 timevar_pop (TV_SSA_DCE); 2693 } 2694 2695 /* Convert from SSA form. */ 2696 2697 timevar_push (TV_FROM_SSA); 2698 open_dump_file (DFI_ussa, decl); 2699 2700 convert_from_ssa (); 2701 /* New registers have been created. Rescan their usage. */ 2702 reg_scan (insns, max_reg_num (), 1); 2703 2704 close_dump_file (DFI_ussa, print_rtl_with_bb, insns); 2705 timevar_pop (TV_FROM_SSA); 2706 2707 ggc_collect (); 2708 /* CFG is no longer maintained up-to-date. */ 2709 free_bb_for_insn (); 2710 } 2711 2712 timevar_push (TV_JUMP); 2713 2714 if (optimize > 0) 2715 { 2716 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2717 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP 2718 | (flag_thread_jumps ? CLEANUP_THREADING : 0)); 2719 2720 /* ??? Run if-conversion before delete_null_pointer_checks, 2721 since the later does not preserve the CFG. This should 2722 be changed -- no since converting if's that are going to 2723 be deleted. */ 2724 timevar_push (TV_IFCVT); 2725 if_convert (0); 2726 timevar_pop (TV_IFCVT); 2727 2728 /* CFG is no longer maintained up-to-date. */ 2729 free_bb_for_insn (); 2730 /* Try to identify useless null pointer tests and delete them. */ 2731 if (flag_delete_null_pointer_checks) 2732 delete_null_pointer_checks (insns); 2733 } 2734 2735 /* Jump optimization, and the removal of NULL pointer checks, may 2736 have reduced the number of instructions substantially. CSE, and 2737 future passes, allocate arrays whose dimensions involve the 2738 maximum instruction UID, so if we can reduce the maximum UID 2739 we'll save big on memory. */ 2740 renumber_insns (rtl_dump_file); 2741 timevar_pop (TV_JUMP); 2742 2743 close_dump_file (DFI_jump, print_rtl, insns); 2744 2745 ggc_collect (); 2746 2747 /* Perform common subexpression elimination. 2748 Nonzero value from `cse_main' means that jumps were simplified 2749 and some code may now be unreachable, so do 2750 jump optimization again. */ 2751 2752 if (optimize > 0) 2753 { 2754 open_dump_file (DFI_cse, decl); 2755 timevar_push (TV_CSE); 2756 2757 reg_scan (insns, max_reg_num (), 1); 2758 2759 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file); 2760 2761 /* If we are not running more CSE passes, then we are no longer 2762 expecting CSE to be run. But always rerun it in a cheap mode. */ 2763 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse; 2764 2765 if (tem || optimize > 1) 2766 { 2767 timevar_push (TV_JUMP); 2768 rebuild_jump_labels (insns); 2769 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2770 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP); 2771 timevar_pop (TV_JUMP); 2772 /* CFG is no longer maintained up-to-date. */ 2773 free_bb_for_insn (); 2774 } 2775 2776 /* Run this after jump optmizations remove all the unreachable code 2777 so that unreachable code will not keep values live. */ 2778 delete_trivially_dead_insns (insns, max_reg_num (), 0); 2779 2780 /* Try to identify useless null pointer tests and delete them. */ 2781 if (flag_delete_null_pointer_checks || flag_thread_jumps) 2782 { 2783 timevar_push (TV_JUMP); 2784 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2785 2786 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP 2787 | (flag_thread_jumps ? CLEANUP_THREADING : 0)); 2788 2789 if (flag_delete_null_pointer_checks) 2790 delete_null_pointer_checks (insns); 2791 /* CFG is no longer maintained up-to-date. */ 2792 free_bb_for_insn (); 2793 timevar_pop (TV_JUMP); 2794 } 2795 2796 /* The second pass of jump optimization is likely to have 2797 removed a bunch more instructions. */ 2798 renumber_insns (rtl_dump_file); 2799 2800 timevar_pop (TV_CSE); 2801 close_dump_file (DFI_cse, print_rtl, insns); 2802 } 2803 2804 open_dump_file (DFI_addressof, decl); 2805 2806 purge_addressof (insns); 2807 reg_scan (insns, max_reg_num (), 1); 2808 2809 close_dump_file (DFI_addressof, print_rtl, insns); 2810 2811 ggc_collect (); 2812 2813 /* Perform global cse. */ 2814 2815 if (optimize > 0 && flag_gcse) 2816 { 2817 int save_csb, save_cfj; 2818 int tem2 = 0; 2819 2820 timevar_push (TV_GCSE); 2821 open_dump_file (DFI_gcse, decl); 2822 2823 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2824 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP); 2825 tem = gcse_main (insns, rtl_dump_file); 2826 rebuild_jump_labels (insns); 2827 2828 save_csb = flag_cse_skip_blocks; 2829 save_cfj = flag_cse_follow_jumps; 2830 flag_cse_skip_blocks = flag_cse_follow_jumps = 0; 2831 2832 /* CFG is no longer maintained up-to-date. */ 2833 free_bb_for_insn (); 2834 /* If -fexpensive-optimizations, re-run CSE to clean up things done 2835 by gcse. */ 2836 if (flag_expensive_optimizations) 2837 { 2838 timevar_push (TV_CSE); 2839 reg_scan (insns, max_reg_num (), 1); 2840 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file); 2841 timevar_pop (TV_CSE); 2842 cse_not_expected = !flag_rerun_cse_after_loop; 2843 } 2844 2845 /* If gcse or cse altered any jumps, rerun jump optimizations to clean 2846 things up. Then possibly re-run CSE again. */ 2847 while (tem || tem2) 2848 { 2849 tem = tem2 = 0; 2850 timevar_push (TV_JUMP); 2851 rebuild_jump_labels (insns); 2852 delete_trivially_dead_insns (insns, max_reg_num (), 0); 2853 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2854 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP); 2855 /* CFG is no longer maintained up-to-date. */ 2856 free_bb_for_insn (); 2857 timevar_pop (TV_JUMP); 2858 2859 if (flag_expensive_optimizations) 2860 { 2861 timevar_push (TV_CSE); 2862 reg_scan (insns, max_reg_num (), 1); 2863 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file); 2864 timevar_pop (TV_CSE); 2865 } 2866 } 2867 2868 close_dump_file (DFI_gcse, print_rtl, insns); 2869 timevar_pop (TV_GCSE); 2870 2871 ggc_collect (); 2872 flag_cse_skip_blocks = save_csb; 2873 flag_cse_follow_jumps = save_cfj; 2874 } 2875 2876 /* Move constant computations out of loops. */ 2877 2878 if (optimize > 0) 2879 { 2880 timevar_push (TV_LOOP); 2881 open_dump_file (DFI_loop, decl); 2882 free_bb_for_insn (); 2883 2884 if (flag_rerun_loop_opt) 2885 { 2886 cleanup_barriers (); 2887 2888 /* We only want to perform unrolling once. */ 2889 loop_optimize (insns, rtl_dump_file, LOOP_FIRST_PASS); 2890 2891 /* The first call to loop_optimize makes some instructions 2892 trivially dead. We delete those instructions now in the 2893 hope that doing so will make the heuristics in loop work 2894 better and possibly speed up compilation. */ 2895 delete_trivially_dead_insns (insns, max_reg_num (), 0); 2896 2897 /* The regscan pass is currently necessary as the alias 2898 analysis code depends on this information. */ 2899 reg_scan (insns, max_reg_num (), 1); 2900 } 2901 cleanup_barriers (); 2902 loop_optimize (insns, rtl_dump_file, 2903 (flag_unroll_loops ? LOOP_UNROLL : 0) | LOOP_BCT 2904 | (flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0)); 2905 2906 close_dump_file (DFI_loop, print_rtl, insns); 2907 timevar_pop (TV_LOOP); 2908 2909 ggc_collect (); 2910 } 2911 2912 if (optimize > 0) 2913 { 2914 timevar_push (TV_CSE2); 2915 open_dump_file (DFI_cse2, decl); 2916 2917 if (flag_rerun_cse_after_loop) 2918 { 2919 /* Running another jump optimization pass before the second 2920 cse pass sometimes simplifies the RTL enough to allow 2921 the second CSE pass to do a better job. Jump_optimize can change 2922 max_reg_num so we must rerun reg_scan afterwards. 2923 ??? Rework to not call reg_scan so often. */ 2924 timevar_push (TV_JUMP); 2925 2926 /* The previous call to loop_optimize makes some instructions 2927 trivially dead. We delete those instructions now in the 2928 hope that doing so will make the heuristics in jump work 2929 better and possibly speed up compilation. */ 2930 delete_trivially_dead_insns (insns, max_reg_num (), 0); 2931 2932 reg_scan (insns, max_reg_num (), 0); 2933 2934 timevar_push (TV_IFCVT); 2935 2936 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2937 cleanup_cfg (CLEANUP_EXPENSIVE); 2938 if_convert (0); 2939 2940 timevar_pop(TV_IFCVT); 2941 2942 timevar_pop (TV_JUMP); 2943 2944 /* CFG is no longer maintained up-to-date. */ 2945 free_bb_for_insn (); 2946 reg_scan (insns, max_reg_num (), 0); 2947 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file); 2948 2949 if (tem) 2950 { 2951 timevar_push (TV_JUMP); 2952 rebuild_jump_labels (insns); 2953 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2954 cleanup_cfg (CLEANUP_EXPENSIVE); 2955 /* CFG is no longer maintained up-to-date. */ 2956 free_bb_for_insn (); 2957 timevar_pop (TV_JUMP); 2958 } 2959 } 2960 2961 close_dump_file (DFI_cse2, print_rtl, insns); 2962 timevar_pop (TV_CSE2); 2963 2964 ggc_collect (); 2965 } 2966 2967 cse_not_expected = 1; 2968 2969 regclass_init (); 2970 2971 /* Do control and data flow analysis; wrote some of the results to 2972 the dump file. */ 2973 2974 timevar_push (TV_FLOW); 2975 open_dump_file (DFI_cfg, decl); 2976 2977 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2978 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) 2979 | (flag_thread_jumps ? CLEANUP_THREADING : 0)); 2980 check_function_return_warnings (); 2981 2982 /* It may make more sense to mark constant functions after dead code is 2983 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs 2984 may insert code making function non-constant, but we still must consider 2985 it as constant, otherwise -fbranch-probabilities will not read data back. 2986 2987 life_analyzis rarely eliminates modification of external memory. 2988 */ 2989 mark_constant_function (); 2990 2991 close_dump_file (DFI_cfg, print_rtl_with_bb, insns); 2992 2993 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities) 2994 { 2995 timevar_push (TV_BRANCH_PROB); 2996 open_dump_file (DFI_bp, decl); 2997 2998 branch_prob (); 2999 3000 close_dump_file (DFI_bp, print_rtl_with_bb, insns); 3001 timevar_pop (TV_BRANCH_PROB); 3002 } 3003 3004 open_dump_file (DFI_life, decl); 3005 if (optimize) 3006 { 3007 struct loops loops; 3008 3009 /* Discover and record the loop depth at the head of each basic 3010 block. The loop infrastructure does the real job for us. */ 3011 flow_loops_find (&loops, LOOP_TREE); 3012 3013 /* Estimate using heuristics if no profiling info is available. */ 3014 if (flag_guess_branch_prob) 3015 estimate_probability (&loops); 3016 3017 if (rtl_dump_file) 3018 flow_loops_dump (&loops, rtl_dump_file, NULL, 0); 3019 3020 flow_loops_free (&loops); 3021 } 3022 life_analysis (insns, rtl_dump_file, PROP_FINAL); 3023 timevar_pop (TV_FLOW); 3024 3025 no_new_pseudos = 1; 3026 3027 if (warn_uninitialized || extra_warnings) 3028 { 3029 uninitialized_vars_warning (DECL_INITIAL (decl)); 3030 if (extra_warnings) 3031 setjmp_args_warning (); 3032 } 3033 3034 if (optimize) 3035 { 3036 if (initialize_uninitialized_subregs ()) 3037 { 3038 /* Insns were inserted, so things might look a bit different. */ 3039 insns = get_insns (); 3040 life_analysis (insns, rtl_dump_file, 3041 (PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES)); 3042 } 3043 } 3044 3045 close_dump_file (DFI_life, print_rtl_with_bb, insns); 3046 3047 ggc_collect (); 3048 3049 /* If -opt, try combining insns through substitution. */ 3050 3051 if (optimize > 0) 3052 { 3053 int rebuild_jump_labels_after_combine = 0; 3054 3055 timevar_push (TV_COMBINE); 3056 open_dump_file (DFI_combine, decl); 3057 3058 rebuild_jump_labels_after_combine 3059 = combine_instructions (insns, max_reg_num ()); 3060 3061 /* Always purge dead edges, as we may eliminate an insn throwing 3062 exception. */ 3063 rebuild_jump_labels_after_combine |= purge_all_dead_edges (true); 3064 3065 /* Combining insns may have turned an indirect jump into a 3066 direct jump. Rebuid the JUMP_LABEL fields of jumping 3067 instructions. */ 3068 if (rebuild_jump_labels_after_combine) 3069 { 3070 timevar_push (TV_JUMP); 3071 rebuild_jump_labels (insns); 3072 timevar_pop (TV_JUMP); 3073 3074 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE); 3075 } 3076 3077 close_dump_file (DFI_combine, print_rtl_with_bb, insns); 3078 timevar_pop (TV_COMBINE); 3079 3080 ggc_collect (); 3081 } 3082 3083 /* Rerun if-conversion, as combine may have simplified things enough to 3084 now meet sequence length restrictions. */ 3085 if (optimize > 0) 3086 { 3087 timevar_push (TV_IFCVT); 3088 open_dump_file (DFI_ce, decl); 3089 3090 no_new_pseudos = 0; 3091 if_convert (1); 3092 no_new_pseudos = 1; 3093 3094 close_dump_file (DFI_ce, print_rtl_with_bb, insns); 3095 timevar_pop (TV_IFCVT); 3096 } 3097 3098 /* Register allocation pre-pass, to reduce number of moves 3099 necessary for two-address machines. */ 3100 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations)) 3101 { 3102 timevar_push (TV_REGMOVE); 3103 open_dump_file (DFI_regmove, decl); 3104 3105 regmove_optimize (insns, max_reg_num (), rtl_dump_file); 3106 3107 close_dump_file (DFI_regmove, print_rtl_with_bb, insns); 3108 timevar_pop (TV_REGMOVE); 3109 3110 ggc_collect (); 3111 } 3112 3113 /* Do unconditional splitting before register allocation to allow machine 3114 description to add extra information not needed previously. */ 3115 split_all_insns (1); 3116 3117 /* Any of the several passes since flow1 will have munged register 3118 lifetime data a bit. */ 3119 register_life_up_to_date = 0; 3120 3121#ifdef OPTIMIZE_MODE_SWITCHING 3122 timevar_push (TV_MODE_SWITCH); 3123 3124 no_new_pseudos = 0; 3125 if (optimize_mode_switching (NULL)) 3126 { 3127 /* We did work, and so had to regenerate global life information. 3128 Take advantage of this and don't re-recompute register life 3129 information below. */ 3130 register_life_up_to_date = 1; 3131 } 3132 no_new_pseudos = 1; 3133 3134 timevar_pop (TV_MODE_SWITCH); 3135#endif 3136 3137 timevar_push (TV_SCHED); 3138 3139#ifdef INSN_SCHEDULING 3140 3141 /* Print function header into sched dump now 3142 because doing the sched analysis makes some of the dump. */ 3143 if (optimize > 0 && flag_schedule_insns) 3144 { 3145 open_dump_file (DFI_sched, decl); 3146 3147 /* Do control and data sched analysis, 3148 and write some of the results to dump file. */ 3149 3150 schedule_insns (rtl_dump_file); 3151 3152 close_dump_file (DFI_sched, print_rtl_with_bb, insns); 3153 3154 /* Register lifetime information was updated as part of verifying 3155 the schedule. */ 3156 register_life_up_to_date = 1; 3157 } 3158#endif 3159 timevar_pop (TV_SCHED); 3160 3161 ggc_collect (); 3162 3163 /* Determine if the current function is a leaf before running reload 3164 since this can impact optimizations done by the prologue and 3165 epilogue thus changing register elimination offsets. */ 3166 current_function_is_leaf = leaf_function_p (); 3167 3168 timevar_push (TV_LOCAL_ALLOC); 3169 open_dump_file (DFI_lreg, decl); 3170 3171 /* Allocate pseudo-regs that are used only within 1 basic block. 3172 3173 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the 3174 jump optimizer after register allocation and reloading are finished. */ 3175 3176 if (! register_life_up_to_date) 3177 recompute_reg_usage (insns, ! optimize_size); 3178 3179 /* Allocate the reg_renumber array. */ 3180 allocate_reg_info (max_regno, FALSE, TRUE); 3181 3182 /* And the reg_equiv_memory_loc array. */ 3183 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx)); 3184 3185 allocate_initial_values (reg_equiv_memory_loc); 3186 3187 regclass (insns, max_reg_num (), rtl_dump_file); 3188 rebuild_label_notes_after_reload = local_alloc (); 3189 3190 timevar_pop (TV_LOCAL_ALLOC); 3191 3192 if (dump_file[DFI_lreg].enabled) 3193 { 3194 timevar_push (TV_DUMP); 3195 3196 dump_flow_info (rtl_dump_file); 3197 dump_local_alloc (rtl_dump_file); 3198 3199 close_dump_file (DFI_lreg, print_rtl_with_bb, insns); 3200 timevar_pop (TV_DUMP); 3201 } 3202 3203 ggc_collect (); 3204 3205 timevar_push (TV_GLOBAL_ALLOC); 3206 open_dump_file (DFI_greg, decl); 3207 3208 /* If optimizing, allocate remaining pseudo-regs. Do the reload 3209 pass fixing up any insns that are invalid. */ 3210 3211 if (optimize) 3212 failure = global_alloc (rtl_dump_file); 3213 else 3214 { 3215 build_insn_chain (insns); 3216 failure = reload (insns, 0); 3217 } 3218 3219 timevar_pop (TV_GLOBAL_ALLOC); 3220 3221 if (dump_file[DFI_greg].enabled) 3222 { 3223 timevar_push (TV_DUMP); 3224 3225 dump_global_regs (rtl_dump_file); 3226 3227 close_dump_file (DFI_greg, print_rtl_with_bb, insns); 3228 timevar_pop (TV_DUMP); 3229 } 3230 3231 if (failure) 3232 goto exit_rest_of_compilation; 3233 3234 ggc_collect (); 3235 3236 open_dump_file (DFI_postreload, decl); 3237 3238 /* Do a very simple CSE pass over just the hard registers. */ 3239 if (optimize > 0) 3240 { 3241 timevar_push (TV_RELOAD_CSE_REGS); 3242 reload_cse_regs (insns); 3243 timevar_pop (TV_RELOAD_CSE_REGS); 3244 } 3245 3246 /* Register allocation and reloading may have turned an indirect jump into 3247 a direct jump. If so, we must rebuild the JUMP_LABEL fields of 3248 jumping instructions. */ 3249 if (rebuild_label_notes_after_reload) 3250 { 3251 timevar_push (TV_JUMP); 3252 3253 rebuild_jump_labels (insns); 3254 3255 timevar_pop (TV_JUMP); 3256 } 3257 3258 close_dump_file (DFI_postreload, print_rtl_with_bb, insns); 3259 3260 /* Re-create the death notes which were deleted during reload. */ 3261 timevar_push (TV_FLOW2); 3262 open_dump_file (DFI_flow2, decl); 3263 3264#ifdef ENABLE_CHECKING 3265 verify_flow_info (); 3266#endif 3267 3268 /* If optimizing, then go ahead and split insns now. */ 3269 if (optimize > 0) 3270 split_all_insns (0); 3271 3272 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0); 3273 3274 /* On some machines, the prologue and epilogue code, or parts thereof, 3275 can be represented as RTL. Doing so lets us schedule insns between 3276 it and the rest of the code and also allows delayed branch 3277 scheduling to operate in the epilogue. */ 3278 thread_prologue_and_epilogue_insns (insns); 3279 3280 /* Cross-jumping is O(N^3) on the number of edges, thus trying to 3281 perform cross-jumping on flow graphs which have a high connectivity 3282 will take a long time. This is similar to the test to disable GCSE. */ 3283 cleanup_crossjump = CLEANUP_CROSSJUMP; 3284 if (n_basic_blocks > 1000 && n_edges / n_basic_blocks >= 20) 3285 { 3286 if (optimize && warn_disabled_optimization) 3287 warning ("crossjump disabled: %d > 1000 basic blocks and %d >= 20 edges/basic block", 3288 n_basic_blocks, n_edges / n_basic_blocks); 3289 cleanup_crossjump = 0; 3290 } 3291 3292 if (optimize) 3293 { 3294 cleanup_cfg (CLEANUP_EXPENSIVE | cleanup_crossjump); 3295 life_analysis (insns, rtl_dump_file, PROP_FINAL); 3296 3297 /* This is kind of a heuristic. We need to run combine_stack_adjustments 3298 even for machines with possibly nonzero RETURN_POPS_ARGS 3299 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having 3300 push instructions will have popping returns. */ 3301#ifndef PUSH_ROUNDING 3302 if (!ACCUMULATE_OUTGOING_ARGS) 3303#endif 3304 combine_stack_adjustments (); 3305 3306 ggc_collect (); 3307 } 3308 3309 flow2_completed = 1; 3310 3311 close_dump_file (DFI_flow2, print_rtl_with_bb, insns); 3312 timevar_pop (TV_FLOW2); 3313 3314#ifdef HAVE_peephole2 3315 if (optimize > 0 && flag_peephole2) 3316 { 3317 timevar_push (TV_PEEPHOLE2); 3318 open_dump_file (DFI_peephole2, decl); 3319 3320 peephole2_optimize (rtl_dump_file); 3321 3322 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns); 3323 timevar_pop (TV_PEEPHOLE2); 3324 } 3325#endif 3326 3327 if (optimize > 0 && (flag_rename_registers || flag_cprop_registers)) 3328 { 3329 timevar_push (TV_RENAME_REGISTERS); 3330 open_dump_file (DFI_rnreg, decl); 3331 3332 if (flag_rename_registers) 3333 regrename_optimize (); 3334 if (flag_cprop_registers) 3335 copyprop_hardreg_forward (); 3336 3337 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns); 3338 timevar_pop (TV_RENAME_REGISTERS); 3339 } 3340 3341 if (optimize > 0) 3342 { 3343 timevar_push (TV_IFCVT2); 3344 open_dump_file (DFI_ce2, decl); 3345 3346 if_convert (1); 3347 3348 close_dump_file (DFI_ce2, print_rtl_with_bb, insns); 3349 timevar_pop (TV_IFCVT2); 3350 } 3351#ifdef STACK_REGS 3352 if (optimize) 3353 split_all_insns (1); 3354#endif 3355 3356#ifdef INSN_SCHEDULING 3357 if (optimize > 0 && flag_schedule_insns_after_reload) 3358 { 3359 timevar_push (TV_SCHED2); 3360 open_dump_file (DFI_sched2, decl); 3361 3362 /* Do control and data sched analysis again, 3363 and write some more of the results to dump file. */ 3364 3365 split_all_insns (1); 3366 3367 schedule_insns (rtl_dump_file); 3368 3369 close_dump_file (DFI_sched2, print_rtl_with_bb, insns); 3370 timevar_pop (TV_SCHED2); 3371 3372 ggc_collect (); 3373 } 3374#endif 3375 3376#ifdef LEAF_REGISTERS 3377 current_function_uses_only_leaf_regs 3378 = optimize > 0 && only_leaf_regs_used () && leaf_function_p (); 3379#endif 3380 3381#ifdef STACK_REGS 3382 timevar_push (TV_REG_STACK); 3383 open_dump_file (DFI_stack, decl); 3384 3385 reg_to_stack (insns, rtl_dump_file); 3386 3387 close_dump_file (DFI_stack, print_rtl_with_bb, insns); 3388 timevar_pop (TV_REG_STACK); 3389 3390 ggc_collect (); 3391#endif 3392 if (optimize > 0) 3393 { 3394 timevar_push (TV_REORDER_BLOCKS); 3395 open_dump_file (DFI_bbro, decl); 3396 3397 /* Last attempt to optimize CFG, as life analysis possibly removed 3398 some instructions. Note that we can't rerun crossjump at this 3399 point, because it can turn a switch into a direct branch, which 3400 can leave the tablejump address calculation in the code, which 3401 can lead to referencing an undefined label. */ 3402 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK); 3403 if (flag_reorder_blocks) 3404 { 3405 reorder_basic_blocks (); 3406 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK); 3407 } 3408 3409 close_dump_file (DFI_bbro, print_rtl_with_bb, insns); 3410 timevar_pop (TV_REORDER_BLOCKS); 3411 } 3412 compute_alignments (); 3413 3414 /* CFG is no longer maintained up-to-date. */ 3415 free_bb_for_insn (); 3416 3417 /* If a machine dependent reorganization is needed, call it. */ 3418#ifdef MACHINE_DEPENDENT_REORG 3419 timevar_push (TV_MACH_DEP); 3420 open_dump_file (DFI_mach, decl); 3421 3422 MACHINE_DEPENDENT_REORG (insns); 3423 3424 close_dump_file (DFI_mach, print_rtl, insns); 3425 timevar_pop (TV_MACH_DEP); 3426 3427 ggc_collect (); 3428#endif 3429 3430 purge_line_number_notes (insns); 3431 cleanup_barriers (); 3432 3433 /* If a scheduling pass for delayed branches is to be done, 3434 call the scheduling code. */ 3435 3436#ifdef DELAY_SLOTS 3437 if (optimize > 0 && flag_delayed_branch) 3438 { 3439 timevar_push (TV_DBR_SCHED); 3440 open_dump_file (DFI_dbr, decl); 3441 3442 dbr_schedule (insns, rtl_dump_file); 3443 3444 close_dump_file (DFI_dbr, print_rtl, insns); 3445 timevar_pop (TV_DBR_SCHED); 3446 3447 ggc_collect (); 3448 } 3449#endif 3450 3451#if defined (HAVE_ATTR_length) && !defined (STACK_REGS) 3452 timevar_push (TV_SHORTEN_BRANCH); 3453 split_all_insns_noflow (); 3454 timevar_pop (TV_SHORTEN_BRANCH); 3455#endif 3456 3457 convert_to_eh_region_ranges (); 3458 3459 /* Shorten branches. */ 3460 timevar_push (TV_SHORTEN_BRANCH); 3461 shorten_branches (get_insns ()); 3462 timevar_pop (TV_SHORTEN_BRANCH); 3463 3464 current_function_nothrow = nothrow_function_p (); 3465 if (current_function_nothrow) 3466 /* Now we know that this can't throw; set the flag for the benefit 3467 of other functions later in this translation unit. */ 3468 TREE_NOTHROW (current_function_decl) = 1; 3469 3470 /* Now turn the rtl into assembler code. */ 3471 3472 timevar_push (TV_FINAL); 3473 { 3474 rtx x; 3475 const char *fnname; 3476 3477 /* Get the function's name, as described by its RTL. This may be 3478 different from the DECL_NAME name used in the source file. */ 3479 3480 x = DECL_RTL (decl); 3481 if (GET_CODE (x) != MEM) 3482 abort (); 3483 x = XEXP (x, 0); 3484 if (GET_CODE (x) != SYMBOL_REF) 3485 abort (); 3486 fnname = XSTR (x, 0); 3487 3488 assemble_start_function (decl, fnname); 3489 final_start_function (insns, asm_out_file, optimize); 3490 final (insns, asm_out_file, optimize, 0); 3491 final_end_function (); 3492 3493#ifdef IA64_UNWIND_INFO 3494 /* ??? The IA-64 ".handlerdata" directive must be issued before 3495 the ".endp" directive that closes the procedure descriptor. */ 3496 output_function_exception_table (); 3497#endif 3498 3499 assemble_end_function (decl, fnname); 3500 3501#ifndef IA64_UNWIND_INFO 3502 /* Otherwise, it feels unclean to switch sections in the middle. */ 3503 output_function_exception_table (); 3504#endif 3505 3506 if (! quiet_flag) 3507 fflush (asm_out_file); 3508 3509 /* Release all memory allocated by flow. */ 3510 free_basic_block_vars (0); 3511 3512 /* Release all memory held by regsets now. */ 3513 regset_release_memory (); 3514 } 3515 timevar_pop (TV_FINAL); 3516 3517 ggc_collect (); 3518 3519 /* Write DBX symbols if requested. */ 3520 3521 /* Note that for those inline functions where we don't initially 3522 know for certain that we will be generating an out-of-line copy, 3523 the first invocation of this routine (rest_of_compilation) will 3524 skip over this code by doing a `goto exit_rest_of_compilation;'. 3525 Later on, finish_compilation will call rest_of_compilation again 3526 for those inline functions that need to have out-of-line copies 3527 generated. During that call, we *will* be routed past here. */ 3528 3529 timevar_push (TV_SYMOUT); 3530 (*debug_hooks->function_decl) (decl); 3531 timevar_pop (TV_SYMOUT); 3532 3533 exit_rest_of_compilation: 3534 3535 /* In case the function was not output, 3536 don't leave any temporary anonymous types 3537 queued up for sdb output. */ 3538#ifdef SDB_DEBUGGING_INFO 3539 if (write_symbols == SDB_DEBUG) 3540 sdbout_types (NULL_TREE); 3541#endif 3542 3543 reload_completed = 0; 3544 flow2_completed = 0; 3545 no_new_pseudos = 0; 3546 3547 timevar_push (TV_FINAL); 3548 3549 /* Clear out the insn_length contents now that they are no 3550 longer valid. */ 3551 init_insn_lengths (); 3552 3553 /* Clear out the real_constant_chain before some of the rtx's 3554 it runs through become garbage. */ 3555 clear_const_double_mem (); 3556 3557 /* Show no temporary slots allocated. */ 3558 init_temp_slots (); 3559 3560 free_basic_block_vars (0); 3561 free_bb_for_insn (); 3562 3563 timevar_pop (TV_FINAL); 3564 3565 /* Make sure volatile mem refs aren't considered valid operands for 3566 arithmetic insns. We must call this here if this is a nested inline 3567 function, since the above code leaves us in the init_recog state 3568 (from final.c), and the function context push/pop code does not 3569 save/restore volatile_ok. 3570 3571 ??? Maybe it isn't necessary for expand_start_function to call this 3572 anymore if we do it here? */ 3573 3574 init_recog_no_volatile (); 3575 3576 /* We're done with this function. Free up memory if we can. */ 3577 free_after_parsing (cfun); 3578 if (! DECL_DEFER_OUTPUT (decl)) 3579 { 3580 free_after_compilation (cfun); 3581 3582 /* Clear integrate.c's pointer to the cfun structure we just 3583 destroyed. */ 3584 DECL_SAVED_INSNS (decl) = 0; 3585 } 3586 cfun = 0; 3587 3588 ggc_collect (); 3589 3590 timevar_pop (TV_REST_OF_COMPILATION); 3591} 3592 3593static void 3594display_help () 3595{ 3596 int undoc; 3597 unsigned long i; 3598 const char *lang; 3599 3600 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n")); 3601 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n")); 3602 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n")); 3603 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n")); 3604 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n")); 3605 printf (_(" -fdiagnostics-show-location=[once | every-line] Indicates how often source location information should be emitted, as prefix, at the beginning of diagnostics when line-wrapping\n")); 3606 3607 for (i = ARRAY_SIZE (f_options); i--;) 3608 { 3609 const char *description = f_options[i].description; 3610 3611 if (description != NULL && * description != 0) 3612 printf (" -f%-21s %s\n", 3613 f_options[i].string, _(description)); 3614 } 3615 3616 printf (_(" -O[number] Set optimization level to [number]\n")); 3617 printf (_(" -Os Optimize for space rather than speed\n")); 3618 for (i = LAST_PARAM; i--;) 3619 { 3620 const char *description = compiler_params[i].help; 3621 const int length = 21-strlen(compiler_params[i].option); 3622 3623 if (description != NULL && * description != 0) 3624 printf (" --param %s=<value>%.*s%s\n", 3625 compiler_params[i].option, 3626 length > 0 ? length : 1, " ", 3627 _(description)); 3628 } 3629 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n")); 3630 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n")); 3631 printf (_(" -w Suppress warnings\n")); 3632 printf (_(" -W Enable extra warnings\n")); 3633 3634 for (i = ARRAY_SIZE (W_options); i--;) 3635 { 3636 const char *description = W_options[i].description; 3637 3638 if (description != NULL && * description != 0) 3639 printf (" -W%-21s %s\n", 3640 W_options[i].string, _(description)); 3641 } 3642 3643 printf (_(" -Wunused Enable unused warnings\n")); 3644 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n")); 3645 printf (_(" -p Enable function profiling\n")); 3646#if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) 3647 printf (_(" -a Enable block profiling \n")); 3648#endif 3649#if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT 3650 printf (_(" -ax Enable jump profiling \n")); 3651#endif 3652 printf (_(" -o <file> Place output into <file> \n")); 3653 printf (_("\ 3654 -G <number> Put global and static data smaller than <number>\n\ 3655 bytes into a special section (on some targets)\n")); 3656 3657 for (i = ARRAY_SIZE (debug_args); i--;) 3658 { 3659 if (debug_args[i].description != NULL) 3660 printf (" -g%-21s %s\n", 3661 debug_args[i].arg, _(debug_args[i].description)); 3662 } 3663 3664 printf (_(" -aux-info <file> Emit declaration info into <file>\n")); 3665 printf (_(" -quiet Do not display functions compiled or elapsed time\n")); 3666 printf (_(" -version Display the compiler's version\n")); 3667 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n")); 3668 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n")); 3669#if defined INSN_SCHEDULING 3670 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n")); 3671#endif 3672 printf (_(" --help Display this information\n")); 3673 3674 undoc = 0; 3675 lang = "language"; 3676 3677 /* Display descriptions of language specific options. 3678 If there is no description, note that there is an undocumented option. 3679 If the description is empty, do not display anything. (This allows 3680 options to be deliberately undocumented, for whatever reason). 3681 If the option string is missing, then this is a marker, indicating 3682 that the description string is in fact the name of a language, whose 3683 language specific options are to follow. */ 3684 3685 if (ARRAY_SIZE (documented_lang_options) > 1) 3686 { 3687 printf (_("\nLanguage specific options:\n")); 3688 3689 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++) 3690 { 3691 const char *description = documented_lang_options[i].description; 3692 const char *option = documented_lang_options[i].option; 3693 3694 if (description == NULL) 3695 { 3696 undoc = 1; 3697 3698 if (extra_warnings) 3699 printf (_(" %-23.23s [undocumented]\n"), option); 3700 } 3701 else if (*description == 0) 3702 continue; 3703 else if (option == NULL) 3704 { 3705 if (undoc) 3706 printf 3707 (_("\nThere are undocumented %s specific options as well.\n"), 3708 lang); 3709 undoc = 0; 3710 3711 printf (_("\n Options for %s:\n"), description); 3712 3713 lang = description; 3714 } 3715 else 3716 printf (" %-23.23s %s\n", option, _(description)); 3717 } 3718 } 3719 3720 if (undoc) 3721 printf (_("\nThere are undocumented %s specific options as well.\n"), 3722 lang); 3723 3724 display_target_options (); 3725} 3726 3727static void 3728display_target_options () 3729{ 3730 int undoc, i; 3731 static bool displayed = false; 3732 3733 /* Avoid double printing for --help --target-help. */ 3734 if (displayed) 3735 return; 3736 displayed = true; 3737 3738 if (ARRAY_SIZE (target_switches) > 1 3739#ifdef TARGET_OPTIONS 3740 || ARRAY_SIZE (target_options) > 1 3741#endif 3742 ) 3743 { 3744 int doc = 0; 3745 3746 undoc = 0; 3747 3748 printf (_("\nTarget specific options:\n")); 3749 3750 for (i = ARRAY_SIZE (target_switches); i--;) 3751 { 3752 const char *option = target_switches[i].name; 3753 const char *description = target_switches[i].description; 3754 3755 if (option == NULL || *option == 0) 3756 continue; 3757 else if (description == NULL) 3758 { 3759 undoc = 1; 3760 3761 if (extra_warnings) 3762 printf (_(" -m%-23.23s [undocumented]\n"), option); 3763 } 3764 else if (* description != 0) 3765 doc += printf (" -m%-23.23s %s\n", option, _(description)); 3766 } 3767 3768#ifdef TARGET_OPTIONS 3769 for (i = ARRAY_SIZE (target_options); i--;) 3770 { 3771 const char *option = target_options[i].prefix; 3772 const char *description = target_options[i].description; 3773 3774 if (option == NULL || *option == 0) 3775 continue; 3776 else if (description == NULL) 3777 { 3778 undoc = 1; 3779 3780 if (extra_warnings) 3781 printf (_(" -m%-23.23s [undocumented]\n"), option); 3782 } 3783 else if (* description != 0) 3784 doc += printf (" -m%-23.23s %s\n", option, _(description)); 3785 } 3786#endif 3787 if (undoc) 3788 { 3789 if (doc) 3790 printf (_("\nThere are undocumented target specific options as well.\n")); 3791 else 3792 printf (_(" They exist, but they are not documented.\n")); 3793 } 3794 } 3795} 3796 3797/* Parse a -d... command line switch. */ 3798 3799static void 3800decode_d_option (arg) 3801 const char *arg; 3802{ 3803 int i, c, matched; 3804 3805 while (*arg) 3806 switch (c = *arg++) 3807 { 3808 case 'a': 3809 for (i = 0; i < (int) DFI_MAX; ++i) 3810 dump_file[i].enabled = 1; 3811 break; 3812 case 'A': 3813 flag_debug_asm = 1; 3814 break; 3815 case 'p': 3816 flag_print_asm_name = 1; 3817 break; 3818 case 'P': 3819 flag_dump_rtl_in_asm = 1; 3820 flag_print_asm_name = 1; 3821 break; 3822 case 'v': 3823 graph_dump_format = vcg; 3824 break; 3825 case 'x': 3826 rtl_dump_and_exit = 1; 3827 break; 3828 case 'y': 3829 (*lang_hooks.set_yydebug) (1); 3830 break; 3831 case 'D': /* These are handled by the preprocessor. */ 3832 case 'I': 3833 break; 3834 3835 default: 3836 matched = 0; 3837 for (i = 0; i < (int) DFI_MAX; ++i) 3838 if (c == dump_file[i].debug_switch) 3839 { 3840 dump_file[i].enabled = 1; 3841 matched = 1; 3842 } 3843 3844 if (! matched) 3845 warning ("unrecognized gcc debugging option: %c", c); 3846 break; 3847 } 3848} 3849 3850/* Parse a -f... command line switch. ARG is the value after the -f. 3851 It is safe to access 'ARG - 2' to generate the full switch name. 3852 Return the number of strings consumed. */ 3853 3854static int 3855decode_f_option (arg) 3856 const char *arg; 3857{ 3858 int j; 3859 const char *option_value = NULL; 3860 3861 /* Search for the option in the table of binary f options. */ 3862 for (j = ARRAY_SIZE (f_options); j--;) 3863 { 3864 if (!strcmp (arg, f_options[j].string)) 3865 { 3866 *f_options[j].variable = f_options[j].on_value; 3867 return 1; 3868 } 3869 3870 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-' 3871 && ! strcmp (arg + 3, f_options[j].string)) 3872 { 3873 *f_options[j].variable = ! f_options[j].on_value; 3874 return 1; 3875 } 3876 } 3877 3878 if (!strcmp (arg, "fast-math")) 3879 set_fast_math_flags (); 3880 else if (!strcmp (arg, "no-fast-math")) 3881 set_no_fast_math_flags (); 3882 else if ((option_value = skip_leading_substring (arg, "inline-limit-")) 3883 || (option_value = skip_leading_substring (arg, "inline-limit="))) 3884 { 3885 int val = 3886 read_integral_parameter (option_value, arg - 2, 3887 MAX_INLINE_INSNS); 3888 set_param_value ("max-inline-insns", val); 3889 } 3890#ifdef INSN_SCHEDULING 3891 else if ((option_value = skip_leading_substring (arg, "sched-verbose="))) 3892 fix_sched_param ("verbose", option_value); 3893#endif 3894 else if ((option_value = skip_leading_substring (arg, "fixed-"))) 3895 fix_register (option_value, 1, 1); 3896 else if ((option_value = skip_leading_substring (arg, "call-used-"))) 3897 fix_register (option_value, 0, 1); 3898 else if ((option_value = skip_leading_substring (arg, "call-saved-"))) 3899 fix_register (option_value, 0, 0); 3900 else if ((option_value = skip_leading_substring (arg, "align-loops="))) 3901 align_loops = read_integral_parameter (option_value, arg - 2, align_loops); 3902 else if ((option_value = skip_leading_substring (arg, "align-functions="))) 3903 align_functions 3904 = read_integral_parameter (option_value, arg - 2, align_functions); 3905 else if ((option_value = skip_leading_substring (arg, "align-jumps="))) 3906 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps); 3907 else if ((option_value = skip_leading_substring (arg, "align-labels="))) 3908 align_labels 3909 = read_integral_parameter (option_value, arg - 2, align_labels); 3910 else if ((option_value 3911 = skip_leading_substring (arg, "stack-limit-register="))) 3912 { 3913 int reg = decode_reg_name (option_value); 3914 if (reg < 0) 3915 error ("unrecognized register name `%s'", option_value); 3916 else 3917 stack_limit_rtx = gen_rtx_REG (Pmode, reg); 3918 } 3919 else if ((option_value 3920 = skip_leading_substring (arg, "stack-limit-symbol="))) 3921 { 3922 const char *nm; 3923 nm = ggc_strdup (option_value); 3924 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm); 3925 } 3926 else if ((option_value 3927 = skip_leading_substring (arg, "message-length="))) 3928 output_set_maximum_length 3929 (&global_dc->buffer, read_integral_parameter 3930 (option_value, arg - 2, diagnostic_line_cutoff (global_dc))); 3931 else if ((option_value 3932 = skip_leading_substring (arg, "diagnostics-show-location="))) 3933 { 3934 if (!strcmp (option_value, "once")) 3935 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE; 3936 else if (!strcmp (option_value, "every-line")) 3937 diagnostic_prefixing_rule (global_dc) 3938 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE; 3939 else 3940 error ("unrecognized option `%s'", arg - 2); 3941 } 3942 else if (!strcmp (arg, "no-stack-limit")) 3943 stack_limit_rtx = NULL_RTX; 3944 else if (!strcmp (arg, "preprocessed")) 3945 /* Recognise this switch but do nothing. This prevents warnings 3946 about an unrecognized switch if cpplib has not been linked in. */ 3947 ; 3948 else 3949 return 0; 3950 3951 return 1; 3952} 3953 3954/* Parse a -W... command line switch. ARG is the value after the -W. 3955 It is safe to access 'ARG - 2' to generate the full switch name. 3956 Return the number of strings consumed. */ 3957 3958static int 3959decode_W_option (arg) 3960 const char *arg; 3961{ 3962 const char *option_value = NULL; 3963 int j; 3964 3965 /* Search for the option in the table of binary W options. */ 3966 3967 for (j = ARRAY_SIZE (W_options); j--;) 3968 { 3969 if (!strcmp (arg, W_options[j].string)) 3970 { 3971 *W_options[j].variable = W_options[j].on_value; 3972 return 1; 3973 } 3974 3975 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-' 3976 && ! strcmp (arg + 3, W_options[j].string)) 3977 { 3978 *W_options[j].variable = ! W_options[j].on_value; 3979 return 1; 3980 } 3981 } 3982 3983 if ((option_value = skip_leading_substring (arg, "id-clash-"))) 3984 warning ("-Wid-clash-LEN is no longer supported"); 3985 else if ((option_value = skip_leading_substring (arg, "larger-than-"))) 3986 { 3987 larger_than_size = read_integral_parameter (option_value, arg - 2, -1); 3988 3989 warn_larger_than = larger_than_size != -1; 3990 } 3991 else if (!strcmp (arg, "unused")) 3992 { 3993 set_Wunused (1); 3994 } 3995 else if (!strcmp (arg, "no-unused")) 3996 { 3997 set_Wunused (0); 3998 } 3999 else 4000 return 0; 4001 4002 return 1; 4003} 4004 4005/* Parse a -g... command line switch. ARG is the value after the -g. 4006 It is safe to access 'ARG - 2' to generate the full switch name. 4007 Return the number of strings consumed. */ 4008 4009static int 4010decode_g_option (arg) 4011 const char *arg; 4012{ 4013 static unsigned level=0; 4014 /* A lot of code assumes write_symbols == NO_DEBUG if the 4015 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track 4016 of what debugging type has been selected). This records the 4017 selected type. It is an error to specify more than one 4018 debugging type. */ 4019 static enum debug_info_type selected_debug_type = NO_DEBUG; 4020 /* Non-zero if debugging format has been explicitly set. 4021 -g and -ggdb don't explicitly set the debugging format so 4022 -gdwarf -g3 is equivalent to -gdwarf3. */ 4023 static int type_explicitly_set_p = 0; 4024 /* Indexed by enum debug_info_type. */ 4025 static const char *const debug_type_names[] = 4026 { 4027 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms" 4028 }; 4029 4030 /* The maximum admissible debug level value. */ 4031 static const unsigned max_debug_level = 3; 4032 4033 /* Look up ARG in the table. */ 4034 for (da = debug_args; da->arg; da++) 4035 { 4036 const int da_len = strlen (da->arg); 4037 4038 if (da_len == 0 || ! strncmp (arg, da->arg, da_len)) 4039 { 4040 enum debug_info_type type = da->debug_type; 4041 const char *p = arg + da_len; 4042 4043 if (*p && ! ISDIGIT (*p)) 4044 continue; 4045 4046 /* A debug flag without a level defaults to level 2. 4047 Note we do not want to call read_integral_parameter 4048 for that case since it will call atoi which 4049 will return zero. 4050 4051 ??? We may want to generalize the interface to 4052 read_integral_parameter to better handle this case 4053 if this case shows up often. */ 4054 if (*p) 4055 level = read_integral_parameter (p, 0, max_debug_level + 1); 4056 else 4057 level = (level == 0) ? 2 : level; 4058 4059 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len)) 4060 { 4061 error ("use -gdwarf -g%d for DWARF v1, level %d", 4062 level, level); 4063 if (level == 2) 4064 error ("use -gdwarf-2 for DWARF v2"); 4065 } 4066 4067 if (level > max_debug_level) 4068 { 4069 warning ("\ 4070ignoring option `%s' due to invalid debug level specification", 4071 arg - 2); 4072 level = debug_info_level; 4073 } 4074 4075 if (type == NO_DEBUG) 4076 { 4077 type = PREFERRED_DEBUGGING_TYPE; 4078 4079 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0) 4080 { 4081#ifdef DWARF2_DEBUGGING_INFO 4082 type = DWARF2_DEBUG; 4083#else 4084#ifdef DBX_DEBUGGING_INFO 4085 type = DBX_DEBUG; 4086#endif 4087#endif 4088 } 4089 } 4090 4091 if (type == NO_DEBUG) 4092 warning ("`%s': unknown or unsupported -g option", arg - 2); 4093 4094 /* Does it conflict with an already selected type? */ 4095 if (type_explicitly_set_p 4096 /* -g/-ggdb don't conflict with anything. */ 4097 && da->debug_type != NO_DEBUG 4098 && type != selected_debug_type) 4099 warning ("`%s' ignored, conflicts with `-g%s'", 4100 arg - 2, debug_type_names[(int) selected_debug_type]); 4101 else 4102 { 4103 /* If the format has already been set, -g/-ggdb 4104 only change the debug level. */ 4105 if (type_explicitly_set_p && da->debug_type == NO_DEBUG) 4106 /* Don't change debugging type. */ 4107 ; 4108 else 4109 { 4110 selected_debug_type = type; 4111 type_explicitly_set_p = da->debug_type != NO_DEBUG; 4112 } 4113 4114 write_symbols = (level == 0 4115 ? NO_DEBUG 4116 : selected_debug_type); 4117 use_gnu_debug_info_extensions = da->use_extensions_p; 4118 debug_info_level = (enum debug_info_level) level; 4119 } 4120 4121 break; 4122 } 4123 } 4124 4125 if (! da->arg) 4126 return 0; 4127 4128 return 1; 4129} 4130 4131/* Decode the first argument in the argv as a language-independent option. 4132 Return the number of strings consumed. */ 4133 4134static unsigned int 4135independent_decode_option (argc, argv) 4136 int argc; 4137 char **argv; 4138{ 4139 char *arg = argv[0]; 4140 4141 if (arg[0] != '-' || arg[1] == 0) 4142 { 4143 if (arg[0] == '+') 4144 return 0; 4145 4146 filename = arg; 4147 4148 return 1; 4149 } 4150 4151 arg++; 4152 4153 if (!strcmp (arg, "-help")) 4154 { 4155 display_help (); 4156 exit_after_options = 1; 4157 } 4158 4159 if (!strcmp (arg, "-target-help")) 4160 { 4161 display_target_options (); 4162 exit_after_options = 1; 4163 } 4164 4165 if (!strcmp (arg, "-version")) 4166 { 4167 print_version (stderr, ""); 4168 exit_after_options = 1; 4169 } 4170 4171 /* Handle '--param <name>=<value>'. */ 4172 if (strcmp (arg, "-param") == 0) 4173 { 4174 char *equal; 4175 4176 if (argc == 1) 4177 { 4178 error ("-param option missing argument"); 4179 return 1; 4180 } 4181 4182 /* Get the '<name>=<value>' parameter. */ 4183 arg = argv[1]; 4184 /* Look for the `='. */ 4185 equal = strchr (arg, '='); 4186 if (!equal) 4187 error ("invalid --param option: %s", arg); 4188 else 4189 { 4190 int val; 4191 4192 /* Zero out the `=' sign so that we get two separate strings. */ 4193 *equal = '\0'; 4194 /* Figure out what value is specified. */ 4195 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL); 4196 if (val != INVALID_PARAM_VAL) 4197 set_param_value (arg, val); 4198 else 4199 error ("invalid parameter value `%s'", equal + 1); 4200 } 4201 4202 return 2; 4203 } 4204 4205 if (*arg == 'Y') 4206 arg++; 4207 4208 switch (*arg) 4209 { 4210 default: 4211 return 0; 4212 4213 case 'O': 4214 /* Already been treated in main (). Do nothing. */ 4215 break; 4216 4217 case 'm': 4218 set_target_switch (arg + 1); 4219 break; 4220 4221 case 'f': 4222 return decode_f_option (arg + 1); 4223 4224 case 'g': 4225 return decode_g_option (arg + 1); 4226 4227 case 'd': 4228 if (!strcmp (arg, "dumpbase")) 4229 { 4230 if (argc == 1) 4231 return 0; 4232 4233 dump_base_name = argv[1]; 4234 return 2; 4235 } 4236 else 4237 decode_d_option (arg + 1); 4238 break; 4239 4240 case 'p': 4241 if (!strcmp (arg, "pedantic")) 4242 pedantic = 1; 4243 else if (!strcmp (arg, "pedantic-errors")) 4244 flag_pedantic_errors = pedantic = 1; 4245 else if (arg[1] == 0) 4246 profile_flag = 1; 4247 else 4248 return 0; 4249 break; 4250 4251 case 'q': 4252 if (!strcmp (arg, "quiet")) 4253 quiet_flag = 1; 4254 else 4255 return 0; 4256 break; 4257 4258 case 'v': 4259 if (!strcmp (arg, "version")) 4260 version_flag = 1; 4261 else 4262 return 0; 4263 break; 4264 4265 case 'w': 4266 if (arg[1] == 0) 4267 inhibit_warnings = 1; 4268 else 4269 return 0; 4270 break; 4271 4272 case 'W': 4273 if (arg[1] == 0) 4274 { 4275 extra_warnings = 1; 4276 /* We save the value of warn_uninitialized, since if they put 4277 -Wuninitialized on the command line, we need to generate a 4278 warning about not using it without also specifying -O. */ 4279 if (warn_uninitialized != 1) 4280 warn_uninitialized = 2; 4281 } 4282 else 4283 return decode_W_option (arg + 1); 4284 break; 4285 4286 case 'a': 4287 if (!strncmp (arg, "aux-info", 8)) 4288 { 4289 if (arg[8] == '\0') 4290 { 4291 if (argc == 1) 4292 return 0; 4293 4294 aux_info_file_name = argv[1]; 4295 flag_gen_aux_info = 1; 4296 return 2; 4297 } 4298 else if (arg[8] == '=') 4299 { 4300 aux_info_file_name = arg + 9; 4301 flag_gen_aux_info = 1; 4302 } 4303 else 4304 return 0; 4305 } 4306 else 4307 return 0; 4308 break; 4309 4310 case 'o': 4311 if (arg[1] == 0) 4312 { 4313 if (argc == 1) 4314 return 0; 4315 4316 asm_file_name = argv[1]; 4317 return 2; 4318 } 4319 return 0; 4320 4321 case 'G': 4322 { 4323 int g_switch_val; 4324 int return_val; 4325 4326 if (arg[1] == 0) 4327 { 4328 if (argc == 1) 4329 return 0; 4330 4331 g_switch_val = read_integral_parameter (argv[1], 0, -1); 4332 return_val = 2; 4333 } 4334 else 4335 { 4336 g_switch_val = read_integral_parameter (arg + 1, 0, -1); 4337 return_val = 1; 4338 } 4339 4340 if (g_switch_val == -1) 4341 return_val = 0; 4342 else 4343 { 4344 g_switch_set = TRUE; 4345 g_switch_value = g_switch_val; 4346 } 4347 4348 return return_val; 4349 } 4350 } 4351 4352 return 1; 4353} 4354 4355/* Decode -m switches. */ 4356/* Decode the switch -mNAME. */ 4357 4358static void 4359set_target_switch (name) 4360 const char *name; 4361{ 4362 size_t j; 4363 int valid_target_option = 0; 4364 4365 for (j = 0; j < ARRAY_SIZE (target_switches); j++) 4366 if (!strcmp (target_switches[j].name, name)) 4367 { 4368 if (target_switches[j].value < 0) 4369 target_flags &= ~-target_switches[j].value; 4370 else 4371 target_flags |= target_switches[j].value; 4372 valid_target_option = 1; 4373 } 4374 4375#ifdef TARGET_OPTIONS 4376 if (!valid_target_option) 4377 for (j = 0; j < ARRAY_SIZE (target_options); j++) 4378 { 4379 int len = strlen (target_options[j].prefix); 4380 if (!strncmp (target_options[j].prefix, name, len)) 4381 { 4382 *target_options[j].variable = name + len; 4383 valid_target_option = 1; 4384 } 4385 } 4386#endif 4387 4388 if (!valid_target_option) 4389 error ("invalid option `%s'", name); 4390} 4391 4392/* Print version information to FILE. 4393 Each line begins with INDENT (for the case where FILE is the 4394 assembler output file). */ 4395 4396static void 4397print_version (file, indent) 4398 FILE *file; 4399 const char *indent; 4400{ 4401#ifndef __VERSION__ 4402#define __VERSION__ "[?]" 4403#endif 4404 fnotice (file, 4405#ifdef __GNUC__ 4406 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n" 4407#else 4408 "%s%s%s version %s (%s) compiled by CC.\n" 4409#endif 4410 , indent, *indent != 0 ? " " : "", 4411 lang_hooks.name, version_string, TARGET_NAME, 4412 indent, __VERSION__); 4413} 4414 4415/* Print an option value and return the adjusted position in the line. 4416 ??? We don't handle error returns from fprintf (disk full); presumably 4417 other code will catch a disk full though. */ 4418 4419static int 4420print_single_switch (file, pos, max, indent, sep, term, type, name) 4421 FILE *file; 4422 int pos, max; 4423 const char *indent, *sep, *term, *type, *name; 4424{ 4425 /* The ultrix fprintf returns 0 on success, so compute the result we want 4426 here since we need it for the following test. */ 4427 int len = strlen (sep) + strlen (type) + strlen (name); 4428 4429 if (pos != 0 4430 && pos + len > max) 4431 { 4432 fprintf (file, "%s", term); 4433 pos = 0; 4434 } 4435 if (pos == 0) 4436 { 4437 fprintf (file, "%s", indent); 4438 pos = strlen (indent); 4439 } 4440 fprintf (file, "%s%s%s", sep, type, name); 4441 pos += len; 4442 return pos; 4443} 4444 4445/* Print active target switches to FILE. 4446 POS is the current cursor position and MAX is the size of a "line". 4447 Each line begins with INDENT and ends with TERM. 4448 Each switch is separated from the next by SEP. */ 4449 4450static void 4451print_switch_values (file, pos, max, indent, sep, term) 4452 FILE *file; 4453 int pos, max; 4454 const char *indent, *sep, *term; 4455{ 4456 size_t j; 4457 char **p; 4458 4459 /* Print the options as passed. */ 4460 4461 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term, 4462 _("options passed: "), ""); 4463 4464 for (p = &save_argv[1]; *p != NULL; p++) 4465 if (**p == '-') 4466 { 4467 /* Ignore these. */ 4468 if (strcmp (*p, "-o") == 0) 4469 { 4470 if (p[1] != NULL) 4471 p++; 4472 continue; 4473 } 4474 if (strcmp (*p, "-quiet") == 0) 4475 continue; 4476 if (strcmp (*p, "-version") == 0) 4477 continue; 4478 if ((*p)[1] == 'd') 4479 continue; 4480 4481 pos = print_single_switch (file, pos, max, indent, sep, term, *p, ""); 4482 } 4483 if (pos > 0) 4484 fprintf (file, "%s", term); 4485 4486 /* Print the -f and -m options that have been enabled. 4487 We don't handle language specific options but printing argv 4488 should suffice. */ 4489 4490 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term, 4491 _("options enabled: "), ""); 4492 4493 for (j = 0; j < ARRAY_SIZE (f_options); j++) 4494 if (*f_options[j].variable == f_options[j].on_value) 4495 pos = print_single_switch (file, pos, max, indent, sep, term, 4496 "-f", f_options[j].string); 4497 4498 /* Print target specific options. */ 4499 4500 for (j = 0; j < ARRAY_SIZE (target_switches); j++) 4501 if (target_switches[j].name[0] != '\0' 4502 && target_switches[j].value > 0 4503 && ((target_switches[j].value & target_flags) 4504 == target_switches[j].value)) 4505 { 4506 pos = print_single_switch (file, pos, max, indent, sep, term, 4507 "-m", target_switches[j].name); 4508 } 4509 4510#ifdef TARGET_OPTIONS 4511 for (j = 0; j < ARRAY_SIZE (target_options); j++) 4512 if (*target_options[j].variable != NULL) 4513 { 4514 char prefix[256]; 4515 sprintf (prefix, "-m%s", target_options[j].prefix); 4516 pos = print_single_switch (file, pos, max, indent, sep, term, 4517 prefix, *target_options[j].variable); 4518 } 4519#endif 4520 4521 fprintf (file, "%s", term); 4522} 4523 4524/* Open assembly code output file. Do this even if -fsyntax-only is 4525 on, because then the driver will have provided the name of a 4526 temporary file or bit bucket for us. NAME is the file specified on 4527 the command line, possibly NULL. */ 4528static void 4529init_asm_output (name) 4530 const char *name; 4531{ 4532 if (name == NULL && asm_file_name == 0) 4533 asm_out_file = stdout; 4534 else 4535 { 4536 if (asm_file_name == 0) 4537 { 4538 int len = strlen (dump_base_name); 4539 char *dumpname = (char *) xmalloc (len + 6); 4540 memcpy (dumpname, dump_base_name, len + 1); 4541 strip_off_ending (dumpname, len); 4542 strcat (dumpname, ".s"); 4543 asm_file_name = dumpname; 4544 } 4545 if (!strcmp (asm_file_name, "-")) 4546 asm_out_file = stdout; 4547 else 4548 asm_out_file = fopen (asm_file_name, "w"); 4549 if (asm_out_file == 0) 4550 fatal_io_error ("can't open %s for writing", asm_file_name); 4551 } 4552 4553#ifdef IO_BUFFER_SIZE 4554 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE), 4555 _IOFBF, IO_BUFFER_SIZE); 4556#endif 4557 4558 if (!flag_syntax_only) 4559 { 4560#ifdef ASM_FILE_START 4561 ASM_FILE_START (asm_out_file); 4562#endif 4563 4564#ifdef ASM_COMMENT_START 4565 if (flag_verbose_asm) 4566 { 4567 /* Print the list of options in effect. */ 4568 print_version (asm_out_file, ASM_COMMENT_START); 4569 print_switch_values (asm_out_file, 0, MAX_LINE, 4570 ASM_COMMENT_START, " ", "\n"); 4571 /* Add a blank line here so it appears in assembler output but not 4572 screen output. */ 4573 fprintf (asm_out_file, "\n"); 4574 } 4575#endif 4576 } 4577} 4578 4579/* Initialization of the front end environment, before command line 4580 options are parsed. Signal handlers, internationalization etc. 4581 ARGV0 is main's argv[0]. */ 4582static void 4583general_init (argv0) 4584 char *argv0; 4585{ 4586 char *p; 4587 4588 p = argv0 + strlen (argv0); 4589 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1])) 4590 --p; 4591 progname = p; 4592 4593 xmalloc_set_program_name (progname); 4594 4595 gcc_init_libintl (); 4596 4597 /* Install handler for SIGFPE, which may be received while we do 4598 compile-time floating point arithmetic. */ 4599 signal (SIGFPE, float_signal); 4600 4601 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */ 4602#ifdef SIGSEGV 4603 signal (SIGSEGV, crash_signal); 4604#endif 4605#ifdef SIGILL 4606 signal (SIGILL, crash_signal); 4607#endif 4608#ifdef SIGBUS 4609 signal (SIGBUS, crash_signal); 4610#endif 4611#ifdef SIGABRT 4612 signal (SIGABRT, crash_signal); 4613#endif 4614#if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT) 4615 signal (SIGIOT, crash_signal); 4616#endif 4617 4618 /* Initialize the diagnostics reporting machinery, so option parsing 4619 can give warnings and errors. */ 4620 diagnostic_initialize (global_dc); 4621} 4622 4623/* Parse command line options and set default flag values, called 4624 after language-independent option-independent initialization. Do 4625 minimal options processing. Outputting diagnostics is OK, but GC 4626 and identifier hashtables etc. are not initialized yet. */ 4627static void 4628parse_options_and_default_flags (argc, argv) 4629 int argc; 4630 char **argv; 4631{ 4632 int i; 4633 4634 /* Save in case md file wants to emit args as a comment. */ 4635 save_argc = argc; 4636 save_argv = argv; 4637 4638 /* Initialize register usage now so switches may override. */ 4639 init_reg_sets (); 4640 4641 /* Register the language-independent parameters. */ 4642 add_params (lang_independent_params, LAST_PARAM); 4643 4644 /* Perform language-specific options initialization. */ 4645 (*lang_hooks.init_options) (); 4646 4647 /* Scan to see what optimization level has been specified. That will 4648 determine the default value of many flags. */ 4649 for (i = 1; i < argc; i++) 4650 { 4651 if (!strcmp (argv[i], "-O")) 4652 { 4653 optimize = 1; 4654 optimize_size = 0; 4655 } 4656 else if (argv[i][0] == '-' && argv[i][1] == 'O') 4657 { 4658 /* Handle -Os, -O2, -O3, -O69, ... */ 4659 char *p = &argv[i][2]; 4660 4661 if ((p[0] == 's') && (p[1] == 0)) 4662 { 4663 optimize_size = 1; 4664 4665 /* Optimizing for size forces optimize to be 2. */ 4666 optimize = 2; 4667 } 4668 else 4669 { 4670 const int optimize_val = read_integral_parameter (p, p - 2, -1); 4671 if (optimize_val != -1) 4672 { 4673 optimize = optimize_val; 4674 4675#ifdef FORCE_OPTIMIZATION_DOWNGRADE 4676#warning FORCE_OPTIMIZATION_DOWNGRADE 4677 if (optimize > FORCE_OPTIMIZATION_DOWNGRADE) 4678 { 4679 optimize = FORCE_OPTIMIZATION_DOWNGRADE; 4680 warning ("\n***\n***\t-O%d converted to \"-O%d\" due to optimizer bugs on this platform\n***", 4681 optimize_val, 4682 FORCE_OPTIMIZATION_DOWNGRADE); 4683 4684 } 4685#endif /*FORCE_OPTIMIZATION_DOWNGRADE*/ 4686 4687#if defined(__alpha__) 4688 if (optimize > 1) 4689 { 4690 warning ("\n***\n***\tThe -O%d flag TRIGGERS KNOWN OPTIMIZER BUGS ON THIS PLATFORM\n***", 4691 optimize_val); 4692 } 4693#endif /*__alpha__*/ 4694 4695 optimize_size = 0; 4696 } 4697 } 4698 } 4699 } 4700 4701 if (!optimize) 4702 { 4703 flag_merge_constants = 0; 4704 } 4705 4706 if (optimize >= 1) 4707 { 4708 flag_defer_pop = 1; 4709 flag_thread_jumps = 1; 4710#ifdef DELAY_SLOTS 4711 flag_delayed_branch = 1; 4712#endif 4713#ifdef CAN_DEBUG_WITHOUT_FP 4714 flag_omit_frame_pointer = 1; 4715#endif 4716 flag_guess_branch_prob = 1; 4717 flag_cprop_registers = 1; 4718 } 4719 4720 if (optimize >= 2) 4721 { 4722 flag_optimize_sibling_calls = 1; 4723 flag_cse_follow_jumps = 1; 4724 flag_cse_skip_blocks = 1; 4725 flag_gcse = 1; 4726 flag_expensive_optimizations = 1; 4727 flag_strength_reduce = 1; 4728 flag_rerun_cse_after_loop = 1; 4729 flag_rerun_loop_opt = 1; 4730 flag_caller_saves = 1; 4731 flag_force_mem = 1; 4732 flag_peephole2 = 1; 4733#ifdef INSN_SCHEDULING 4734 flag_schedule_insns = 1; 4735 flag_schedule_insns_after_reload = 1; 4736#endif 4737 flag_regmove = 1; 4738 flag_strict_aliasing = 1; 4739 flag_delete_null_pointer_checks = 1; 4740 flag_reorder_blocks = 1; 4741 } 4742 4743 if (optimize >= 3) 4744 { 4745 flag_inline_functions = 1; 4746 flag_rename_registers = 1; 4747 } 4748 4749 if (optimize_size) 4750 { 4751 align_loops = 1; 4752 align_jumps = 1; 4753 align_labels = 1; 4754 align_functions = 1; 4755 } 4756 4757 /* Initialize whether `char' is signed. */ 4758 flag_signed_char = DEFAULT_SIGNED_CHAR; 4759#ifdef DEFAULT_SHORT_ENUMS 4760 /* Initialize how much space enums occupy, by default. */ 4761 flag_short_enums = DEFAULT_SHORT_ENUMS; 4762#endif 4763 4764 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can 4765 modify it. */ 4766 target_flags = 0; 4767 set_target_switch (""); 4768 4769 /* Unwind tables are always present in an ABI-conformant IA-64 4770 object file, so the default should be ON. */ 4771#ifdef IA64_UNWIND_INFO 4772 flag_unwind_tables = IA64_UNWIND_INFO; 4773#endif 4774 4775#ifdef OPTIMIZATION_OPTIONS 4776 /* Allow default optimizations to be specified on a per-machine basis. */ 4777 OPTIMIZATION_OPTIONS (optimize, optimize_size); 4778#endif 4779 4780 /* Perform normal command line switch decoding. */ 4781 for (i = 1; i < argc;) 4782 { 4783 int lang_processed; 4784 int indep_processed; 4785 4786 /* Give the language a chance to decode the option for itself. */ 4787 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i); 4788 4789 if (lang_processed >= 0) 4790 /* Now see if the option also has a language independent meaning. 4791 Some options are both language specific and language independent, 4792 eg --help. */ 4793 indep_processed = independent_decode_option (argc - i, argv + i); 4794 else 4795 { 4796 lang_processed = -lang_processed; 4797 indep_processed = 0; 4798 } 4799 4800 if (lang_processed || indep_processed) 4801 i += MAX (lang_processed, indep_processed); 4802 else 4803 { 4804 const char *option = NULL; 4805 const char *lang = NULL; 4806 unsigned int j; 4807 4808 /* It is possible that the command line switch is not valid for the 4809 current language, but it is valid for another language. In order 4810 to be compatible with previous versions of the compiler (which 4811 did not issue an error message in this case) we check for this 4812 possibility here. If we do find a match, then if extra_warnings 4813 is set we generate a warning message, otherwise we will just 4814 ignore the option. */ 4815 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++) 4816 { 4817 option = documented_lang_options[j].option; 4818 4819 if (option == NULL) 4820 lang = documented_lang_options[j].description; 4821 else if (! strncmp (argv[i], option, strlen (option))) 4822 break; 4823 } 4824 4825 if (j != ARRAY_SIZE (documented_lang_options)) 4826 { 4827 if (extra_warnings) 4828 { 4829 warning ("ignoring command line option '%s'", argv[i]); 4830 if (lang) 4831 warning 4832 ("(it is valid for %s but not the selected language)", 4833 lang); 4834 } 4835 } 4836 else if (argv[i][0] == '-' && argv[i][1] == 'g') 4837 warning ("`%s': unknown or unsupported -g option", &argv[i][2]); 4838 else 4839 error ("unrecognized option `%s'", argv[i]); 4840 4841 i++; 4842 } 4843 } 4844 4845 if (flag_no_inline == 2) 4846 flag_no_inline = 0; 4847 else 4848 flag_really_no_inline = flag_no_inline; 4849 4850 /* Set flag_no_inline before the post_options () hook. The C front 4851 ends use it to determine tree inlining defaults. FIXME: such 4852 code should be lang-independent when all front ends use tree 4853 inlining, in which case it, and this condition, should be moved 4854 to the top of process_options() instead. */ 4855 if (optimize == 0) 4856 { 4857 /* Inlining does not work if not optimizing, 4858 so force it not to be done. */ 4859 flag_no_inline = 1; 4860 warn_inline = 0; 4861 4862 /* The c_decode_option function and decode_option hook set 4863 this to `2' if -Wall is used, so we can avoid giving out 4864 lots of errors for people who don't realize what -Wall does. */ 4865 if (warn_uninitialized == 1) 4866 warning ("-Wuninitialized is not supported without -O"); 4867 } 4868 4869 if (flag_really_no_inline == 2) 4870 flag_really_no_inline = flag_no_inline; 4871 4872 /* All command line options have been parsed; allow the front end to 4873 perform consistency checks, etc. */ 4874 (*lang_hooks.post_options) (); 4875} 4876 4877/* Process the options that have been parsed. */ 4878static void 4879process_options () 4880{ 4881#ifdef OVERRIDE_OPTIONS 4882 /* Some machines may reject certain combinations of options. */ 4883 OVERRIDE_OPTIONS; 4884#endif 4885 4886 /* Set up the align_*_log variables, defaulting them to 1 if they 4887 were still unset. */ 4888 if (align_loops <= 0) align_loops = 1; 4889 if (align_loops_max_skip > align_loops || !align_loops) 4890 align_loops_max_skip = align_loops - 1; 4891 align_loops_log = floor_log2 (align_loops * 2 - 1); 4892 if (align_jumps <= 0) align_jumps = 1; 4893 if (align_jumps_max_skip > align_jumps || !align_jumps) 4894 align_jumps_max_skip = align_jumps - 1; 4895 align_jumps_log = floor_log2 (align_jumps * 2 - 1); 4896 if (align_labels <= 0) align_labels = 1; 4897 align_labels_log = floor_log2 (align_labels * 2 - 1); 4898 if (align_labels_max_skip > align_labels || !align_labels) 4899 align_labels_max_skip = align_labels - 1; 4900 if (align_functions <= 0) align_functions = 1; 4901 align_functions_log = floor_log2 (align_functions * 2 - 1); 4902 4903 /* Unrolling all loops implies that standard loop unrolling must also 4904 be done. */ 4905 if (flag_unroll_all_loops) 4906 flag_unroll_loops = 1; 4907 /* Loop unrolling requires that strength_reduction be on also. Silently 4908 turn on strength reduction here if it isn't already on. Also, the loop 4909 unrolling code assumes that cse will be run after loop, so that must 4910 be turned on also. */ 4911 if (flag_unroll_loops) 4912 { 4913 flag_strength_reduce = 1; 4914 flag_rerun_cse_after_loop = 1; 4915 } 4916 4917 if (flag_non_call_exceptions) 4918 flag_asynchronous_unwind_tables = 1; 4919 if (flag_asynchronous_unwind_tables) 4920 flag_unwind_tables = 1; 4921 4922 /* Warn about options that are not supported on this machine. */ 4923#ifndef INSN_SCHEDULING 4924 if (flag_schedule_insns || flag_schedule_insns_after_reload) 4925 warning ("instruction scheduling not supported on this target machine"); 4926#endif 4927#ifndef DELAY_SLOTS 4928 if (flag_delayed_branch) 4929 warning ("this target machine does not have delayed branches"); 4930#endif 4931 4932 /* Some operating systems do not allow profiling without a frame 4933 pointer. */ 4934 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER 4935 && profile_flag 4936 && flag_omit_frame_pointer) 4937 { 4938 error ("profiling does not work without a frame pointer"); 4939 flag_omit_frame_pointer = 0; 4940 } 4941 4942 user_label_prefix = USER_LABEL_PREFIX; 4943 if (flag_leading_underscore != -1) 4944 { 4945 /* If the default prefix is more complicated than "" or "_", 4946 issue a warning and ignore this option. */ 4947 if (user_label_prefix[0] == 0 || 4948 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0)) 4949 { 4950 user_label_prefix = flag_leading_underscore ? "_" : ""; 4951 } 4952 else 4953 warning ("-f%sleading-underscore not supported on this target machine", 4954 flag_leading_underscore ? "" : "no-"); 4955 } 4956 4957 /* If we are in verbose mode, write out the version and maybe all the 4958 option flags in use. */ 4959 if (version_flag) 4960 { 4961 print_version (stderr, ""); 4962 if (! quiet_flag) 4963 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n"); 4964 } 4965 4966 if (! quiet_flag) 4967 time_report = 1; 4968 4969 if (flag_syntax_only) 4970 { 4971 write_symbols = NO_DEBUG; 4972 profile_flag = 0; 4973 } 4974 4975 /* Now we know write_symbols, set up the debug hooks based on it. 4976 By default we do nothing for debug output. */ 4977#if defined(DBX_DEBUGGING_INFO) 4978 if (write_symbols == DBX_DEBUG) 4979 debug_hooks = &dbx_debug_hooks; 4980#endif 4981#if defined(XCOFF_DEBUGGING_INFO) 4982 if (write_symbols == XCOFF_DEBUG) 4983 debug_hooks = &xcoff_debug_hooks; 4984#endif 4985#ifdef SDB_DEBUGGING_INFO 4986 if (write_symbols == SDB_DEBUG) 4987 debug_hooks = &sdb_debug_hooks; 4988#endif 4989#ifdef DWARF_DEBUGGING_INFO 4990 if (write_symbols == DWARF_DEBUG) 4991 debug_hooks = &dwarf_debug_hooks; 4992#endif 4993#ifdef DWARF2_DEBUGGING_INFO 4994 if (write_symbols == DWARF2_DEBUG) 4995 debug_hooks = &dwarf2_debug_hooks; 4996#endif 4997#ifdef VMS_DEBUGGING_INFO 4998 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG) 4999 debug_hooks = &vmsdbg_debug_hooks; 5000#endif 5001 5002 /* If auxiliary info generation is desired, open the output file. 5003 This goes in the same directory as the source file--unlike 5004 all the other output files. */ 5005 if (flag_gen_aux_info) 5006 { 5007 aux_info_file = fopen (aux_info_file_name, "w"); 5008 if (aux_info_file == 0) 5009 fatal_io_error ("can't open %s", aux_info_file_name); 5010 } 5011 5012 if (! targetm.have_named_sections) 5013 { 5014 if (flag_function_sections) 5015 { 5016 warning ("-ffunction-sections not supported for this target"); 5017 flag_function_sections = 0; 5018 } 5019 if (flag_data_sections) 5020 { 5021 warning ("-fdata-sections not supported for this target"); 5022 flag_data_sections = 0; 5023 } 5024 } 5025 5026 if (flag_function_sections && profile_flag) 5027 { 5028 warning ("-ffunction-sections disabled; it makes profiling impossible"); 5029 flag_function_sections = 0; 5030 } 5031 5032#ifndef HAVE_prefetch 5033 if (flag_prefetch_loop_arrays) 5034 { 5035 warning ("-fprefetch-loop-arrays not supported for this target"); 5036 flag_prefetch_loop_arrays = 0; 5037 } 5038#else 5039 if (flag_prefetch_loop_arrays && !HAVE_prefetch) 5040 { 5041 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)"); 5042 flag_prefetch_loop_arrays = 0; 5043 } 5044#endif 5045 5046 /* This combination of options isn't handled for i386 targets and doesn't 5047 make much sense anyway, so don't allow it. */ 5048 if (flag_prefetch_loop_arrays && optimize_size) 5049 { 5050 warning ("-fprefetch-loop-arrays is not supported with -Os"); 5051 flag_prefetch_loop_arrays = 0; 5052 } 5053 5054#ifndef OBJECT_FORMAT_ELF 5055 if (flag_function_sections && write_symbols != NO_DEBUG) 5056 warning ("-ffunction-sections may affect debugging on some targets"); 5057#endif 5058} 5059 5060/* Language-independent initialization, before language-dependent 5061 initialization. */ 5062static void 5063lang_independent_init () 5064{ 5065 decl_printable_name = decl_name; 5066 lang_expand_expr = (lang_expand_expr_t) do_abort; 5067 5068 /* Set the language-dependent identifier size. */ 5069 tree_code_length[(int) IDENTIFIER_NODE] 5070 = ((lang_hooks.identifier_size - sizeof (struct tree_common) 5071 + sizeof (tree) - 1) / sizeof (tree)); 5072 5073 /* Initialize the garbage-collector, and string pools. */ 5074 init_ggc (); 5075 ggc_add_rtx_root (&stack_limit_rtx, 1); 5076 ggc_add_tree_root (¤t_function_decl, 1); 5077 ggc_add_tree_root (¤t_function_func_begin_label, 1); 5078 5079 init_stringpool (); 5080 init_obstacks (); 5081 5082 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL 5083 || debug_info_level == DINFO_LEVEL_VERBOSE 5084#ifdef VMS_DEBUGGING_INFO 5085 /* Enable line number info for traceback */ 5086 || debug_info_level > DINFO_LEVEL_NONE 5087#endif 5088 || flag_test_coverage 5089 || warn_notreached); 5090 init_regs (); 5091 init_alias_once (); 5092 init_stmt (); 5093 init_loop (); 5094 init_reload (); 5095 init_function_once (); 5096 init_stor_layout_once (); 5097 init_varasm_once (); 5098 init_EXPR_INSN_LIST_cache (); 5099 5100 /* The following initialization functions need to generate rtl, so 5101 provide a dummy function context for them. */ 5102 init_dummy_function_start (); 5103 init_expmed (); 5104 init_expr_once (); 5105 if (flag_caller_saves) 5106 init_caller_save (); 5107 expand_dummy_function_end (); 5108} 5109 5110/* Language-dependent initialization. Returns non-zero on success. */ 5111static int 5112lang_dependent_init (name) 5113 const char *name; 5114{ 5115 if (dump_base_name == 0) 5116 dump_base_name = name ? name : "gccdump"; 5117 5118 /* Front-end initialization. This hook can assume that GC, 5119 identifier hashes etc. are set up, but debug initialization is 5120 not done yet. This routine must return the original filename 5121 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */ 5122 name = (*lang_hooks.init) (name); 5123 if (name == NULL) 5124 return 0; 5125 5126 /* Is this duplication necessary? */ 5127 name = ggc_strdup (name); 5128 main_input_filename = input_filename = name; 5129 init_asm_output (name); 5130 5131 /* These create various _DECL nodes, so need to be called after the 5132 front end is initialized. */ 5133 init_eh (); 5134 init_optabs (); 5135 5136 /* Put an entry on the input file stack for the main input file. */ 5137 push_srcloc (input_filename, 0); 5138 5139 /* If dbx symbol table desired, initialize writing it and output the 5140 predefined types. */ 5141 timevar_push (TV_SYMOUT); 5142 5143#ifdef DWARF2_UNWIND_INFO 5144 if (dwarf2out_do_frame ()) 5145 dwarf2out_frame_init (); 5146#endif 5147 5148 /* Now we have the correct original filename, we can initialize 5149 debug output. */ 5150 (*debug_hooks->init) (name); 5151 5152 timevar_pop (TV_SYMOUT); 5153 5154 return 1; 5155} 5156 5157/* Clean up: close opened files, etc. */ 5158 5159static void 5160finalize () 5161{ 5162 /* Close the dump files. */ 5163 if (flag_gen_aux_info) 5164 { 5165 fclose (aux_info_file); 5166 if (errorcount) 5167 unlink (aux_info_file_name); 5168 } 5169 5170 /* Close non-debugging input and output files. Take special care to note 5171 whether fclose returns an error, since the pages might still be on the 5172 buffer chain while the file is open. */ 5173 5174 if (asm_out_file) 5175 { 5176 if (ferror (asm_out_file) != 0) 5177 fatal_io_error ("error writing to %s", asm_file_name); 5178 if (fclose (asm_out_file) != 0) 5179 fatal_io_error ("error closing %s", asm_file_name); 5180 } 5181 5182 /* Do whatever is necessary to finish printing the graphs. */ 5183 if (graph_dump_format != no_graph) 5184 { 5185 int i; 5186 5187 for (i = 0; i < (int) DFI_MAX; ++i) 5188 if (dump_file[i].initialized && dump_file[i].graph_dump_p) 5189 { 5190 char seq[16]; 5191 char *suffix; 5192 5193 sprintf (seq, DUMPFILE_FORMAT, i); 5194 suffix = concat (seq, dump_file[i].extension, NULL); 5195 finish_graph_dump_file (dump_base_name, suffix); 5196 free (suffix); 5197 } 5198 } 5199 5200 if (mem_report) 5201 { 5202 ggc_print_statistics (); 5203 stringpool_statistics (); 5204 dump_tree_statistics (); 5205 } 5206 5207 /* Free up memory for the benefit of leak detectors. */ 5208 free_reg_info (); 5209 5210 /* Language-specific end of compilation actions. */ 5211 (*lang_hooks.finish) (); 5212} 5213 5214/* Initialize the compiler, and compile the input file. */ 5215static void 5216do_compile () 5217{ 5218 /* The bulk of command line switch processing. */ 5219 process_options (); 5220 5221 /* We cannot start timing until after options are processed since that 5222 says if we run timers or not. */ 5223 init_timevar (); 5224 timevar_start (TV_TOTAL); 5225 5226 /* Language-independent initialization. Also sets up GC, identifier 5227 hashes etc. */ 5228 lang_independent_init (); 5229 5230 /* Language-dependent initialization. Returns true on success. */ 5231 if (lang_dependent_init (filename)) 5232 compile_file (); 5233 5234 finalize (); 5235 5236 /* Stop timing and print the times. */ 5237 timevar_stop (TV_TOTAL); 5238 timevar_print (stderr); 5239} 5240 5241/* Entry point of cc1, cc1plus, jc1, f771, etc. 5242 Decode command args, then call compile_file. 5243 Exit code is FATAL_EXIT_CODE if can't open files or if there were 5244 any errors, or SUCCESS_EXIT_CODE if compilation succeeded. 5245 5246 It is not safe to call this function more than once. */ 5247 5248int 5249toplev_main (argc, argv) 5250 int argc; 5251 char **argv; 5252{ 5253 hex_init (); 5254 5255 /* Initialization of GCC's environment, and diagnostics. */ 5256 general_init (argv [0]); 5257 5258 /* Parse the options and do minimal processing; basically just 5259 enough to default flags appropriately. */ 5260 parse_options_and_default_flags (argc, argv); 5261 5262 /* Exit early if we can (e.g. -help). */ 5263 if (!exit_after_options) 5264 do_compile (); 5265 5266 if (errorcount || sorrycount) 5267 return (FATAL_EXIT_CODE); 5268 5269 return (SUCCESS_EXIT_CODE); 5270} 5271