toplev.c revision 107595
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 107595 2002-12-04 15:59:56Z 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/* Like align_functions_log above, but used by front-ends to force the 888 minimum function alignment. Zero means no alignment is forced. */ 889int force_align_functions_log; 890 891/* Table of supported debugging formats. */ 892static const struct 893{ 894 const char *const arg; 895 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a 896 constant expression, we use NO_DEBUG in its place. */ 897 const enum debug_info_type debug_type; 898 const int use_extensions_p; 899 const char *const description; 900} *da, 901debug_args[] = 902{ 903 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS, 904 N_("Generate debugging info in default format") }, 905 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") }, 906#ifdef DBX_DEBUGGING_INFO 907 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") }, 908 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") }, 909#endif 910#ifdef DWARF_DEBUGGING_INFO 911 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") }, 912 { "dwarf+", DWARF_DEBUG, 1, 913 N_("Generate extended DWARF-1 format debug info") }, 914#endif 915#ifdef DWARF2_DEBUGGING_INFO 916 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") }, 917#endif 918#ifdef XCOFF_DEBUGGING_INFO 919 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") }, 920 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") }, 921#endif 922#ifdef SDB_DEBUGGING_INFO 923 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") }, 924#endif 925#ifdef VMS_DEBUGGING_INFO 926 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") }, 927#endif 928 { 0, 0, 0, 0 } 929}; 930 931typedef struct 932{ 933 const char *const string; 934 int *const variable; 935 const int on_value; 936 const char *const description; 937} 938lang_independent_options; 939 940int flag_trapv = 0; 941 942/* Add or remove a leading underscore from user symbols. */ 943int flag_leading_underscore = -1; 944 945/* The user symbol prefix after having resolved same. */ 946const char *user_label_prefix; 947 948static const param_info lang_independent_params[] = { 949#define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \ 950 { OPTION, DEFAULT, HELP }, 951#include "params.def" 952#undef DEFPARAM 953 { NULL, 0, NULL } 954}; 955 956/* A default for same. */ 957#ifndef USER_LABEL_PREFIX 958#define USER_LABEL_PREFIX "" 959#endif 960 961/* Table of language-independent -f options. 962 STRING is the option name. VARIABLE is the address of the variable. 963 ON_VALUE is the value to store in VARIABLE 964 if `-fSTRING' is seen as an option. 965 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */ 966 967static const lang_independent_options f_options[] = 968{ 969 {"format-extensions", &flag_format_extensions, 1, 970 N_("-Wformat accepts certain FreeBSD system-dependent formats") }, 971 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1, 972 N_("Perform DWARF2 duplicate elimination") }, 973 {"float-store", &flag_float_store, 1, 974 N_("Do not store floats in registers") }, 975 {"volatile", &flag_volatile, 1, 976 N_("Consider all mem refs through pointers as volatile") }, 977 {"volatile-global", &flag_volatile_global, 1, 978 N_("Consider all mem refs to global data to be volatile") }, 979 {"volatile-static", &flag_volatile_static, 1, 980 N_("Consider all mem refs to static data to be volatile") }, 981 {"defer-pop", &flag_defer_pop, 1, 982 N_("Defer popping functions args from stack until later") }, 983 {"omit-frame-pointer", &flag_omit_frame_pointer, 1, 984 N_("When possible do not generate stack frames") }, 985 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1, 986 N_("Optimize sibling and tail recursive calls") }, 987 {"cse-follow-jumps", &flag_cse_follow_jumps, 1, 988 N_("When running CSE, follow jumps to their targets") }, 989 {"cse-skip-blocks", &flag_cse_skip_blocks, 1, 990 N_("When running CSE, follow conditional jumps") }, 991 {"expensive-optimizations", &flag_expensive_optimizations, 1, 992 N_("Perform a number of minor, expensive optimizations") }, 993 {"thread-jumps", &flag_thread_jumps, 1, 994 N_("Perform jump threading optimizations") }, 995 {"strength-reduce", &flag_strength_reduce, 1, 996 N_("Perform strength reduction optimizations") }, 997 {"unroll-loops", &flag_unroll_loops, 1, 998 N_("Perform loop unrolling when iteration count is known") }, 999 {"unroll-all-loops", &flag_unroll_all_loops, 1, 1000 N_("Perform loop unrolling for all loops") }, 1001 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1, 1002 N_("Generate prefetch instructions, if available, for arrays in loops") }, 1003 {"move-all-movables", &flag_move_all_movables, 1, 1004 N_("Force all loop invariant computations out of loops") }, 1005 {"reduce-all-givs", &flag_reduce_all_givs, 1, 1006 N_("Strength reduce all loop general induction variables") }, 1007 {"writable-strings", &flag_writable_strings, 1, 1008 N_("Store strings in writable data section") }, 1009 {"peephole", &flag_no_peephole, 0, 1010 N_("Enable machine specific peephole optimizations") }, 1011 {"force-mem", &flag_force_mem, 1, 1012 N_("Copy memory operands into registers before using") }, 1013 {"force-addr", &flag_force_addr, 1, 1014 N_("Copy memory address constants into regs before using") }, 1015 {"function-cse", &flag_no_function_cse, 0, 1016 N_("Allow function addresses to be held in registers") }, 1017 {"inline-functions", &flag_inline_functions, 1, 1018 N_("Integrate simple functions into their callers") }, 1019 {"keep-inline-functions", &flag_keep_inline_functions, 1, 1020 N_("Generate code for funcs even if they are fully inlined") }, 1021 {"inline", &flag_no_inline, 0, 1022 N_("Pay attention to the 'inline' keyword") }, 1023 {"keep-static-consts", &flag_keep_static_consts, 1, 1024 N_("Emit static const variables even if they are not used") }, 1025 {"syntax-only", &flag_syntax_only, 1, 1026 N_("Check for syntax errors, then stop") }, 1027 {"shared-data", &flag_shared_data, 1, 1028 N_("Mark data as shared rather than private") }, 1029 {"caller-saves", &flag_caller_saves, 1, 1030 N_("Enable saving registers around function calls") }, 1031 {"pcc-struct-return", &flag_pcc_struct_return, 1, 1032 N_("Return 'short' aggregates in memory, not registers") }, 1033 {"reg-struct-return", &flag_pcc_struct_return, 0, 1034 N_("Return 'short' aggregates in registers") }, 1035 {"delayed-branch", &flag_delayed_branch, 1, 1036 N_("Attempt to fill delay slots of branch instructions") }, 1037 {"gcse", &flag_gcse, 1, 1038 N_("Perform the global common subexpression elimination") }, 1039 {"gcse-lm", &flag_gcse_lm, 1, 1040 N_("Perform enhanced load motion during global subexpression elimination") }, 1041 {"gcse-sm", &flag_gcse_sm, 1, 1042 N_("Perform store motion after global subexpression elimination") }, 1043 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1, 1044 N_("Run CSE pass after loop optimizations") }, 1045 {"rerun-loop-opt", &flag_rerun_loop_opt, 1, 1046 N_("Run the loop optimizer twice") }, 1047 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1, 1048 N_("Delete useless null pointer checks") }, 1049 {"pretend-float", &flag_pretend_float, 1, 1050 N_("Pretend that host and target use the same FP format") }, 1051 {"schedule-insns", &flag_schedule_insns, 1, 1052 N_("Reschedule instructions before register allocation") }, 1053 {"schedule-insns2", &flag_schedule_insns_after_reload, 1, 1054 N_("Reschedule instructions after register allocation") }, 1055 {"sched-interblock",&flag_schedule_interblock, 1, 1056 N_("Enable scheduling across basic blocks") }, 1057 {"sched-spec",&flag_schedule_speculative, 1, 1058 N_("Allow speculative motion of non-loads") }, 1059 {"sched-spec-load",&flag_schedule_speculative_load, 1, 1060 N_("Allow speculative motion of some loads") }, 1061 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1, 1062 N_("Allow speculative motion of more loads") }, 1063 {"branch-count-reg",&flag_branch_on_count_reg, 1, 1064 N_("Replace add,compare,branch with branch on count reg") }, 1065 {"pic", &flag_pic, 1, 1066 N_("Generate position independent code, if possible") }, 1067 {"PIC", &flag_pic, 2, ""}, 1068 {"exceptions", &flag_exceptions, 1, 1069 N_("Enable exception handling") }, 1070 {"unwind-tables", &flag_unwind_tables, 1, 1071 N_("Just generate unwind tables for exception handling") }, 1072 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1, 1073 N_("Generate unwind tables exact at each instruction boundary") }, 1074 {"non-call-exceptions", &flag_non_call_exceptions, 1, 1075 N_("Support synchronous non-call exceptions") }, 1076 {"profile-arcs", &profile_arc_flag, 1, 1077 N_("Insert arc based program profiling code") }, 1078 {"test-coverage", &flag_test_coverage, 1, 1079 N_("Create data files needed by gcov") }, 1080 {"branch-probabilities", &flag_branch_probabilities, 1, 1081 N_("Use profiling information for branch probabilities") }, 1082 {"reorder-blocks", &flag_reorder_blocks, 1, 1083 N_("Reorder basic blocks to improve code placement") }, 1084 {"rename-registers", &flag_rename_registers, 1, 1085 N_("Do the register renaming optimization pass") }, 1086 {"cprop-registers", &flag_cprop_registers, 1, 1087 N_("Do the register copy-propagation optimization pass") }, 1088 {"common", &flag_no_common, 0, 1089 N_("Do not put uninitialized globals in the common section") }, 1090 {"inhibit-size-directive", &flag_inhibit_size_directive, 1, 1091 N_("Do not generate .size directives") }, 1092 {"function-sections", &flag_function_sections, 1, 1093 N_("place each function into its own section") }, 1094 {"data-sections", &flag_data_sections, 1, 1095 N_("place data items into their own section") }, 1096 {"verbose-asm", &flag_verbose_asm, 1, 1097 N_("Add extra commentry to assembler output") }, 1098 {"gnu-linker", &flag_gnu_linker, 1, 1099 N_("Output GNU ld formatted global initializers") }, 1100 {"regmove", &flag_regmove, 1, 1101 N_("Enables a register move optimization") }, 1102 {"optimize-register-move", &flag_regmove, 1, 1103 N_("Do the full regmove optimization pass") }, 1104 {"pack-struct", &flag_pack_struct, 1, 1105 N_("Pack structure members together without holes") }, 1106 {"stack-check", &flag_stack_check, 1, 1107 N_("Insert stack checking code into the program") }, 1108 {"argument-alias", &flag_argument_noalias, 0, 1109 N_("Specify that arguments may alias each other & globals") }, 1110 {"argument-noalias", &flag_argument_noalias, 1, 1111 N_("Assume arguments may alias globals but not each other") }, 1112 {"argument-noalias-global", &flag_argument_noalias, 2, 1113 N_("Assume arguments do not alias each other or globals") }, 1114 {"strict-aliasing", &flag_strict_aliasing, 1, 1115 N_("Assume strict aliasing rules apply") }, 1116 {"align-loops", &align_loops, 0, 1117 N_("Align the start of loops") }, 1118 {"align-jumps", &align_jumps, 0, 1119 N_("Align labels which are only reached by jumping") }, 1120 {"align-labels", &align_labels, 0, 1121 N_("Align all labels") }, 1122 {"align-functions", &align_functions, 0, 1123 N_("Align the start of functions") }, 1124 {"merge-constants", &flag_merge_constants, 1, 1125 N_("Attempt to merge identical constants accross compilation units") }, 1126 {"merge-all-constants", &flag_merge_constants, 2, 1127 N_("Attempt to merge identical constants and constant variables") }, 1128 {"dump-unnumbered", &flag_dump_unnumbered, 1, 1129 N_("Suppress output of instruction numbers and line number notes in debugging dumps") }, 1130 {"instrument-functions", &flag_instrument_function_entry_exit, 1, 1131 N_("Instrument function entry/exit with profiling calls") }, 1132 {"ssa", &flag_ssa, 1, 1133 N_("Enable SSA optimizations") }, 1134 {"ssa-ccp", &flag_ssa_ccp, 1, 1135 N_("Enable SSA conditional constant propagation") }, 1136 {"ssa-dce", &flag_ssa_dce, 1, 1137 N_("Enable aggressive SSA dead code elimination") }, 1138 {"leading-underscore", &flag_leading_underscore, 1, 1139 N_("External symbols have a leading underscore") }, 1140 {"ident", &flag_no_ident, 0, 1141 N_("Process #ident directives") }, 1142 { "peephole2", &flag_peephole2, 1, 1143 N_("Enables an rtl peephole pass run before sched2") }, 1144 { "guess-branch-probability", &flag_guess_branch_prob, 1, 1145 N_("Enables guessing of branch probabilities") }, 1146 {"math-errno", &flag_errno_math, 1, 1147 N_("Set errno after built-in math functions") }, 1148 {"trapping-math", &flag_trapping_math, 1, 1149 N_("Floating-point operations can trap") }, 1150 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1, 1151 N_("Allow math optimizations that may violate IEEE or ANSI standards") }, 1152 {"bounded-pointers", &flag_bounded_pointers, 1, 1153 N_("Compile pointers as triples: value, base & end") }, 1154 {"bounds-check", &flag_bounds_check, 1, 1155 N_("Generate code to check bounds before dereferencing pointers and arrays") }, 1156 {"single-precision-constant", &flag_single_precision_constant, 1, 1157 N_("Convert floating point constant to single precision constant") }, 1158 {"time-report", &time_report, 1, 1159 N_("Report time taken by each compiler pass at end of run") }, 1160 {"mem-report", &mem_report, 1, 1161 N_("Report on permanent memory allocation at end of run") }, 1162 { "trapv", &flag_trapv, 1, 1163 N_("Trap for signed overflow in addition / subtraction / multiplication") }, 1164}; 1165 1166/* Table of language-specific options. */ 1167 1168static const struct lang_opt 1169{ 1170 const char *const option; 1171 const char *const description; 1172} 1173documented_lang_options[] = 1174{ 1175 /* In order not to overload the --help output, the convention 1176 used here is to only describe those options which are not 1177 enabled by default. */ 1178 1179 { "-ansi", 1180 N_("Compile just for ISO C89") }, 1181 { "-fallow-single-precision", 1182 N_("Do not promote floats to double if using -traditional") }, 1183 { "-std= ", 1184 N_("Determine language standard") }, 1185 1186 { "-fsigned-bitfields", "" }, 1187 { "-funsigned-bitfields", 1188 N_("Make bit-fields by unsigned by default") }, 1189 { "-fno-signed-bitfields", "" }, 1190 { "-fno-unsigned-bitfields","" }, 1191 { "-fsigned-char", 1192 N_("Make 'char' be signed by default") }, 1193 { "-funsigned-char", 1194 N_("Make 'char' be unsigned by default") }, 1195 { "-fno-signed-char", "" }, 1196 { "-fno-unsigned-char", "" }, 1197 1198 { "-ftraditional", "" }, 1199 { "-traditional", 1200 N_("Attempt to support traditional K&R style C") }, 1201 { "-fnotraditional", "" }, 1202 { "-fno-traditional", "" }, 1203 1204 { "-fasm", "" }, 1205 { "-fno-asm", 1206 N_("Do not recognize the 'asm' keyword") }, 1207 { "-fbuiltin", "" }, 1208 { "-fno-builtin", 1209 N_("Do not recognize any built in functions") }, 1210 { "-fhosted", 1211 N_("Assume normal C execution environment") }, 1212 { "-fno-hosted", "" }, 1213 { "-ffreestanding", 1214 N_("Assume that standard libraries & main might not exist") }, 1215 { "-fno-freestanding", "" }, 1216 { "-fcond-mismatch", 1217 N_("Allow different types as args of ? operator") }, 1218 { "-fno-cond-mismatch", "" }, 1219 { "-fdollars-in-identifiers", 1220 N_("Allow the use of $ inside identifiers") }, 1221 { "-fno-dollars-in-identifiers", "" }, 1222 { "-fpreprocessed", "" }, 1223 { "-fno-preprocessed", "" }, 1224 { "-fshort-double", 1225 N_("Use the same size for double as for float") }, 1226 { "-fno-short-double", "" }, 1227 { "-fshort-enums", 1228 N_("Use the smallest fitting integer to hold enums") }, 1229 { "-fno-short-enums", "" }, 1230 { "-fshort-wchar", 1231 N_("Override the underlying type for wchar_t to `unsigned short'") }, 1232 { "-fno-short-wchar", "" }, 1233 1234 { "-Wall", 1235 N_("Enable most warning messages") }, 1236 { "-Wbad-function-cast", 1237 N_("Warn about casting functions to incompatible types") }, 1238 { "-Wno-bad-function-cast", "" }, 1239 { "-Wno-missing-noreturn", "" }, 1240 { "-Wmissing-format-attribute", 1241 N_("Warn about functions which might be candidates for format attributes") }, 1242 { "-Wno-missing-format-attribute", "" }, 1243 { "-Wcast-qual", 1244 N_("Warn about casts which discard qualifiers") }, 1245 { "-Wno-cast-qual", "" }, 1246 { "-Wchar-subscripts", 1247 N_("Warn about subscripts whose type is 'char'") }, 1248 { "-Wno-char-subscripts", "" }, 1249 { "-Wcomment", 1250 N_("Warn if nested comments are detected") }, 1251 { "-Wno-comment", "" }, 1252 { "-Wcomments", 1253 N_("Warn if nested comments are detected") }, 1254 { "-Wno-comments", "" }, 1255 { "-Wconversion", 1256 N_("Warn about possibly confusing type conversions") }, 1257 { "-Wno-conversion", "" }, 1258 { "-Wformat", 1259 N_("Warn about printf/scanf/strftime/strfmon format anomalies") }, 1260 { "-Wno-format", "" }, 1261 { "-Wformat-y2k", "" }, 1262 { "-Wno-format-y2k", 1263 N_("Don't warn about strftime formats yielding 2 digit years") }, 1264 { "-Wformat-extra-args", "" }, 1265 { "-Wno-format-extra-args", 1266 N_("Don't warn about too many arguments to format functions") }, 1267 { "-Wformat-nonliteral", 1268 N_("Warn about non-string-literal format strings") }, 1269 { "-Wno-format-nonliteral", "" }, 1270 { "-Wformat-security", 1271 N_("Warn about possible security problems with format functions") }, 1272 { "-Wno-format-security", "" }, 1273 { "-Wimplicit-function-declaration", 1274 N_("Warn about implicit function declarations") }, 1275 { "-Wno-implicit-function-declaration", "" }, 1276 { "-Werror-implicit-function-declaration", "" }, 1277 { "-Wimplicit-int", 1278 N_("Warn when a declaration does not specify a type") }, 1279 { "-Wno-implicit-int", "" }, 1280 { "-Wimplicit", "" }, 1281 { "-Wno-implicit", "" }, 1282 { "-Wimport", 1283 N_("Warn about the use of the #import directive") }, 1284 { "-Wno-import", "" }, 1285 { "-Wlong-long","" }, 1286 { "-Wno-long-long", 1287 N_("Do not warn about using 'long long' when -pedantic") }, 1288 { "-Wmain", 1289 N_("Warn about suspicious declarations of main") }, 1290 { "-Wno-main", "" }, 1291 { "-Wmissing-braces", 1292 N_("Warn about possibly missing braces around initializers") }, 1293 { "-Wno-missing-braces", "" }, 1294 { "-Wmissing-declarations", 1295 N_("Warn about global funcs without previous declarations") }, 1296 { "-Wno-missing-declarations", "" }, 1297 { "-Wmissing-prototypes", 1298 N_("Warn about global funcs without prototypes") }, 1299 { "-Wno-missing-prototypes", "" }, 1300 { "-Wmultichar", 1301 N_("Warn about use of multicharacter literals") }, 1302 { "-Wno-multichar", "" }, 1303 { "-Wnested-externs", 1304 N_("Warn about externs not at file scope level") }, 1305 { "-Wno-nested-externs", "" }, 1306 { "-Wparentheses", 1307 N_("Warn about possible missing parentheses") }, 1308 { "-Wno-parentheses", "" }, 1309 { "-Wsequence-point", 1310 N_("Warn about possible violations of sequence point rules") }, 1311 { "-Wno-sequence-point", "" }, 1312 { "-Wpointer-arith", 1313 N_("Warn about function pointer arithmetic") }, 1314 { "-Wno-pointer-arith", "" }, 1315 { "-Wredundant-decls", 1316 N_("Warn about multiple declarations of the same object") }, 1317 { "-Wno-redundant-decls", "" }, 1318 { "-Wsign-compare", 1319 N_("Warn about signed/unsigned comparisons") }, 1320 { "-Wno-sign-compare", "" }, 1321 { "-Wfloat-equal", 1322 N_("Warn about testing equality of floating point numbers") }, 1323 { "-Wno-float-equal", "" }, 1324 { "-Wunknown-pragmas", 1325 N_("Warn about unrecognized pragmas") }, 1326 { "-Wno-unknown-pragmas", "" }, 1327 { "-Wstrict-prototypes", 1328 N_("Warn about non-prototyped function decls") }, 1329 { "-Wno-strict-prototypes", "" }, 1330 { "-Wtraditional", 1331 N_("Warn about constructs whose meaning change in ISO C") }, 1332 { "-Wno-traditional", "" }, 1333 { "-Wtrigraphs", 1334 N_("Warn when trigraphs are encountered") }, 1335 { "-Wno-trigraphs", "" }, 1336 { "-Wundef", "" }, 1337 { "-Wno-undef", "" }, 1338 { "-Wwrite-strings", 1339 N_("Mark strings as 'const char *'") }, 1340 { "-Wno-write-strings", "" }, 1341 1342#define DEFINE_LANG_NAME(NAME) { NULL, NAME }, 1343 1344#include "options.h" 1345 1346}; 1347 1348/* Here is a table, controlled by the tm.h file, listing each -m switch 1349 and which bits in `target_switches' it should set or clear. 1350 If VALUE is positive, it is bits to set. 1351 If VALUE is negative, -VALUE is bits to clear. 1352 (The sign bit is not used so there is no confusion.) */ 1353 1354static const struct 1355{ 1356 const char *const name; 1357 const int value; 1358 const char *const description; 1359} 1360target_switches [] = TARGET_SWITCHES; 1361 1362/* This table is similar, but allows the switch to have a value. */ 1363 1364#ifdef TARGET_OPTIONS 1365static const struct 1366{ 1367 const char *const prefix; 1368 const char **const variable; 1369 const char *const description; 1370} 1371target_options [] = TARGET_OPTIONS; 1372#endif 1373 1374/* Options controlling warnings. */ 1375 1376/* Don't print warning messages. -w. */ 1377 1378int inhibit_warnings = 0; 1379 1380/* Don't suppress warnings from system headers. -Wsystem-headers. */ 1381 1382int warn_system_headers = 0; 1383 1384/* Print various extra warnings. -W. */ 1385 1386int extra_warnings = 0; 1387 1388/* Treat warnings as errors. -Werror. */ 1389 1390int warnings_are_errors = 0; 1391 1392/* Nonzero to warn about unused variables, functions et.al. */ 1393 1394int warn_unused_function; 1395int warn_unused_label; 1396int warn_unused_parameter; 1397int warn_unused_variable; 1398int warn_unused_value; 1399 1400/* Nonzero to warn about code which is never reached. */ 1401 1402int warn_notreached; 1403 1404/* Nonzero to warn about variables used before they are initialized. */ 1405 1406int warn_uninitialized; 1407 1408/* Nonzero means warn about all declarations which shadow others. */ 1409 1410int warn_shadow; 1411 1412/* Warn if a switch on an enum fails to have a case for every enum value. */ 1413 1414int warn_switch; 1415 1416/* Nonzero means warn about function definitions that default the return type 1417 or that use a null return and have a return-type other than void. */ 1418 1419int warn_return_type; 1420 1421/* Nonzero means warn about pointer casts that increase the required 1422 alignment of the target type (and might therefore lead to a crash 1423 due to a misaligned access). */ 1424 1425int warn_cast_align; 1426 1427/* Nonzero means warn about any objects definitions whose size is larger 1428 than N bytes. Also want about function definitions whose returned 1429 values are larger than N bytes. The value N is in `larger_than_size'. */ 1430 1431int warn_larger_than; 1432HOST_WIDE_INT larger_than_size; 1433 1434/* Nonzero means warn if inline function is too large. */ 1435 1436int warn_inline; 1437 1438/* Warn if a function returns an aggregate, 1439 since there are often incompatible calling conventions for doing this. */ 1440 1441int warn_aggregate_return; 1442 1443/* Warn if packed attribute on struct is unnecessary and inefficient. */ 1444 1445int warn_packed; 1446 1447/* Warn when gcc pads a structure to an alignment boundary. */ 1448 1449int warn_padded; 1450 1451/* Warn when an optimization pass is disabled. */ 1452 1453int warn_disabled_optimization; 1454 1455/* Warn about functions which might be candidates for attribute noreturn. */ 1456 1457int warn_missing_noreturn; 1458 1459/* Nonzero means warn about uses of __attribute__((deprecated)) 1460 declarations. */ 1461 1462int warn_deprecated_decl = 1; 1463 1464/* Likewise for -W. */ 1465 1466static const lang_independent_options W_options[] = 1467{ 1468 {"unused-function", &warn_unused_function, 1, 1469 N_("Warn when a function is unused") }, 1470 {"unused-label", &warn_unused_label, 1, 1471 N_("Warn when a label is unused") }, 1472 {"unused-parameter", &warn_unused_parameter, 1, 1473 N_("Warn when a function parameter is unused") }, 1474 {"unused-variable", &warn_unused_variable, 1, 1475 N_("Warn when a variable is unused") }, 1476 {"unused-value", &warn_unused_value, 1, 1477 N_("Warn when an expression value is unused") }, 1478 {"system-headers", &warn_system_headers, 1, 1479 N_("Do not suppress warnings from system headers") }, 1480 {"error", &warnings_are_errors, 1, 1481 N_("Treat all warnings as errors") }, 1482 {"shadow", &warn_shadow, 1, 1483 N_("Warn when one local variable shadows another") }, 1484 {"switch", &warn_switch, 1, 1485 N_("Warn about enumerated switches missing a specific case") }, 1486 {"aggregate-return", &warn_aggregate_return, 1, 1487 N_("Warn about returning structures, unions or arrays") }, 1488 {"cast-align", &warn_cast_align, 1, 1489 N_("Warn about pointer casts which increase alignment") }, 1490 {"unreachable-code", &warn_notreached, 1, 1491 N_("Warn about code that will never be executed") }, 1492 {"uninitialized", &warn_uninitialized, 1, 1493 N_("Warn about uninitialized automatic variables") }, 1494 {"inline", &warn_inline, 1, 1495 N_("Warn when an inlined function cannot be inlined") }, 1496 {"packed", &warn_packed, 1, 1497 N_("Warn when the packed attribute has no effect on struct layout") }, 1498 {"padded", &warn_padded, 1, 1499 N_("Warn when padding is required to align struct members") }, 1500 {"disabled-optimization", &warn_disabled_optimization, 1, 1501 N_("Warn when an optimization pass is disabled") }, 1502 {"deprecated-declarations", &warn_deprecated_decl, 1, 1503 N_("Warn about uses of __attribute__((deprecated)) declarations") }, 1504 {"missing-noreturn", &warn_missing_noreturn, 1, 1505 N_("Warn about functions which might be candidates for attribute noreturn") } 1506}; 1507 1508void 1509set_Wunused (setting) 1510 int setting; 1511{ 1512 warn_unused_function = setting; 1513 warn_unused_label = setting; 1514 /* Unused function parameter warnings are reported when either ``-W 1515 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate 1516 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */ 1517 if (!setting) 1518 warn_unused_parameter = 0; 1519 else if (!warn_unused_parameter) 1520 warn_unused_parameter = -1; 1521 warn_unused_variable = setting; 1522 warn_unused_value = setting; 1523} 1524 1525/* The following routines are useful in setting all the flags that 1526 -ffast-math and -fno-fast-math imply. */ 1527 1528void 1529set_fast_math_flags () 1530{ 1531 flag_trapping_math = 0; 1532 flag_unsafe_math_optimizations = 1; 1533 flag_errno_math = 0; 1534} 1535 1536void 1537set_no_fast_math_flags () 1538{ 1539 flag_trapping_math = 1; 1540 flag_unsafe_math_optimizations = 0; 1541 flag_errno_math = 1; 1542} 1543 1544 1545/* Output files for assembler code (real compiler output) 1546 and debugging dumps. */ 1547 1548FILE *asm_out_file; 1549FILE *aux_info_file; 1550FILE *rtl_dump_file = NULL; 1551 1552/* Decode the string P as an integral parameter. 1553 If the string is indeed an integer return its numeric value else 1554 issue an Invalid Option error for the option PNAME and return DEFVAL. 1555 If PNAME is zero just return DEFVAL, do not call error. */ 1556 1557int 1558read_integral_parameter (p, pname, defval) 1559 const char *p; 1560 const char *pname; 1561 const int defval; 1562{ 1563 const char *endp = p; 1564 1565 while (*endp) 1566 { 1567 if (ISDIGIT (*endp)) 1568 endp++; 1569 else 1570 break; 1571 } 1572 1573 if (*endp != 0) 1574 { 1575 if (pname != 0) 1576 error ("invalid option `%s'", pname); 1577 return defval; 1578 } 1579 1580 return atoi (p); 1581} 1582 1583 1584/* This is the default decl_printable_name function. */ 1585 1586static const char * 1587decl_name (decl, verbosity) 1588 tree decl; 1589 int verbosity ATTRIBUTE_UNUSED; 1590{ 1591 return IDENTIFIER_POINTER (DECL_NAME (decl)); 1592} 1593 1594 1595/* This calls abort and is used to avoid problems when abort if a macro. 1596 It is used when we need to pass the address of abort. */ 1597 1598void 1599do_abort () 1600{ 1601 abort (); 1602} 1603 1604/* When `malloc.c' is compiled with `rcheck' defined, 1605 it calls this function to report clobberage. */ 1606 1607void 1608botch (s) 1609 const char *s ATTRIBUTE_UNUSED; 1610{ 1611 abort (); 1612} 1613 1614/* Return the logarithm of X, base 2, considering X unsigned, 1615 if X is a power of 2. Otherwise, returns -1. 1616 1617 This should be used via the `exact_log2' macro. */ 1618 1619int 1620exact_log2_wide (x) 1621 unsigned HOST_WIDE_INT x; 1622{ 1623 int log = 0; 1624 /* Test for 0 or a power of 2. */ 1625 if (x == 0 || x != (x & -x)) 1626 return -1; 1627 while ((x >>= 1) != 0) 1628 log++; 1629 return log; 1630} 1631 1632/* Given X, an unsigned number, return the largest int Y such that 2**Y <= X. 1633 If X is 0, return -1. 1634 1635 This should be used via the floor_log2 macro. */ 1636 1637int 1638floor_log2_wide (x) 1639 unsigned HOST_WIDE_INT x; 1640{ 1641 int log = -1; 1642 while (x != 0) 1643 log++, 1644 x >>= 1; 1645 return log; 1646} 1647 1648static int float_handler_set; 1649int float_handled; 1650jmp_buf float_handler; 1651 1652/* Signals actually come here. */ 1653 1654static void 1655float_signal (signo) 1656 /* If this is missing, some compilers complain. */ 1657 int signo ATTRIBUTE_UNUSED; 1658{ 1659 if (float_handled == 0) 1660 crash_signal (signo); 1661 float_handled = 0; 1662 1663 /* On System-V derived systems, we must reinstall the signal handler. 1664 This is harmless on BSD-derived systems. */ 1665 signal (SIGFPE, float_signal); 1666 longjmp (float_handler, 1); 1667} 1668 1669/* Specify where to longjmp to when a floating arithmetic error happens. 1670 If HANDLER is 0, it means don't handle the errors any more. */ 1671 1672static void 1673set_float_handler (handler) 1674 jmp_buf handler; 1675{ 1676 float_handled = (handler != 0); 1677 if (handler) 1678 memcpy (float_handler, handler, sizeof (float_handler)); 1679 1680 if (float_handled && ! float_handler_set) 1681 { 1682 signal (SIGFPE, float_signal); 1683 float_handler_set = 1; 1684 } 1685} 1686 1687/* This is a wrapper function for code which might elicit an 1688 arithmetic exception. That code should be passed in as a function 1689 pointer FN, and one argument DATA. DATA is usually a struct which 1690 contains the real input and output for function FN. This function 1691 returns 0 (failure) if longjmp was called (i.e. an exception 1692 occurred.) It returns 1 (success) otherwise. */ 1693 1694int 1695do_float_handler (fn, data) 1696 void (*fn) PARAMS ((PTR)); 1697 PTR data; 1698{ 1699 jmp_buf buf; 1700 1701 if (setjmp (buf)) 1702 { 1703 /* We got here via longjmp () caused by an exception in function 1704 fn (). */ 1705 set_float_handler (NULL); 1706 return 0; 1707 } 1708 1709 set_float_handler (buf); 1710 (*fn)(data); 1711 set_float_handler (NULL); 1712 return 1; 1713} 1714 1715/* Handler for fatal signals, such as SIGSEGV. These are transformed 1716 into ICE messages, which is much more user friendly. */ 1717 1718static void 1719crash_signal (signo) 1720 int signo; 1721{ 1722 internal_error ("internal error: %s", strsignal (signo)); 1723} 1724 1725/* Strip off a legitimate source ending from the input string NAME of 1726 length LEN. Rather than having to know the names used by all of 1727 our front ends, we strip off an ending of a period followed by 1728 up to five characters. (Java uses ".class".) */ 1729 1730void 1731strip_off_ending (name, len) 1732 char *name; 1733 int len; 1734{ 1735 int i; 1736 for (i = 2; i < 6 && len > i; i++) 1737 { 1738 if (name[len - i] == '.') 1739 { 1740 name[len - i] = '\0'; 1741 break; 1742 } 1743 } 1744} 1745 1746/* Output a quoted string. */ 1747 1748void 1749output_quoted_string (asm_file, string) 1750 FILE *asm_file; 1751 const char *string; 1752{ 1753#ifdef OUTPUT_QUOTED_STRING 1754 OUTPUT_QUOTED_STRING (asm_file, string); 1755#else 1756 char c; 1757 1758 putc ('\"', asm_file); 1759 while ((c = *string++) != 0) 1760 { 1761 if (ISPRINT (c)) 1762 { 1763 if (c == '\"' || c == '\\') 1764 putc ('\\', asm_file); 1765 putc (c, asm_file); 1766 } 1767 else 1768 fprintf (asm_file, "\\%03o", c); 1769 } 1770 putc ('\"', asm_file); 1771#endif 1772} 1773 1774/* Output a file name in the form wanted by System V. */ 1775 1776void 1777output_file_directive (asm_file, input_name) 1778 FILE *asm_file; 1779 const char *input_name; 1780{ 1781 int len = strlen (input_name); 1782 const char *na = input_name + len; 1783 1784 /* NA gets INPUT_NAME sans directory names. */ 1785 while (na > input_name) 1786 { 1787 if (IS_DIR_SEPARATOR (na[-1])) 1788 break; 1789 na--; 1790 } 1791 1792#ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME 1793 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na); 1794#else 1795#ifdef ASM_OUTPUT_SOURCE_FILENAME 1796 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na); 1797#else 1798 fprintf (asm_file, "\t.file\t"); 1799 output_quoted_string (asm_file, na); 1800 fputc ('\n', asm_file); 1801#endif 1802#endif 1803} 1804 1805/* Routine to open a dump file. Return true if the dump file is enabled. */ 1806 1807static int 1808open_dump_file (index, decl) 1809 enum dump_file_index index; 1810 tree decl; 1811{ 1812 char *dump_name; 1813 const char *open_arg; 1814 char seq[16]; 1815 1816 if (! dump_file[index].enabled) 1817 return 0; 1818 1819 timevar_push (TV_DUMP); 1820 if (rtl_dump_file != NULL) 1821 fclose (rtl_dump_file); 1822 1823 sprintf (seq, DUMPFILE_FORMAT, index); 1824 1825 if (! dump_file[index].initialized) 1826 { 1827 /* If we've not initialized the files, do so now. */ 1828 if (graph_dump_format != no_graph 1829 && dump_file[index].graph_dump_p) 1830 { 1831 dump_name = concat (seq, dump_file[index].extension, NULL); 1832 clean_graph_dump_file (dump_base_name, dump_name); 1833 free (dump_name); 1834 } 1835 dump_file[index].initialized = 1; 1836 open_arg = "w"; 1837 } 1838 else 1839 open_arg = "a"; 1840 1841 dump_name = concat (dump_base_name, seq, 1842 dump_file[index].extension, NULL); 1843 1844 rtl_dump_file = fopen (dump_name, open_arg); 1845 if (rtl_dump_file == NULL) 1846 fatal_io_error ("can't open %s", dump_name); 1847 1848 free (dump_name); 1849 1850 if (decl) 1851 fprintf (rtl_dump_file, "\n;; Function %s\n\n", 1852 decl_printable_name (decl, 2)); 1853 1854 timevar_pop (TV_DUMP); 1855 return 1; 1856} 1857 1858/* Routine to close a dump file. */ 1859 1860static void 1861close_dump_file (index, func, insns) 1862 enum dump_file_index index; 1863 void (*func) PARAMS ((FILE *, rtx)); 1864 rtx insns; 1865{ 1866 if (! rtl_dump_file) 1867 return; 1868 1869 timevar_push (TV_DUMP); 1870 if (insns 1871 && graph_dump_format != no_graph 1872 && dump_file[index].graph_dump_p) 1873 { 1874 char seq[16]; 1875 char *suffix; 1876 1877 sprintf (seq, DUMPFILE_FORMAT, index); 1878 suffix = concat (seq, dump_file[index].extension, NULL); 1879 print_rtl_graph_with_bb (dump_base_name, suffix, insns); 1880 free (suffix); 1881 } 1882 1883 if (func && insns) 1884 func (rtl_dump_file, insns); 1885 1886 fflush (rtl_dump_file); 1887 fclose (rtl_dump_file); 1888 1889 rtl_dump_file = NULL; 1890 timevar_pop (TV_DUMP); 1891} 1892 1893/* Do any final processing required for the declarations in VEC, of 1894 which there are LEN. We write out inline functions and variables 1895 that have been deferred until this point, but which are required. 1896 Returns non-zero if anything was put out. */ 1897 1898int 1899wrapup_global_declarations (vec, len) 1900 tree *vec; 1901 int len; 1902{ 1903 tree decl; 1904 int i; 1905 int reconsider; 1906 int output_something = 0; 1907 1908 for (i = 0; i < len; i++) 1909 { 1910 decl = vec[i]; 1911 1912 /* We're not deferring this any longer. */ 1913 DECL_DEFER_OUTPUT (decl) = 0; 1914 1915 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0 1916 && incomplete_decl_finalize_hook != 0) 1917 (*incomplete_decl_finalize_hook) (decl); 1918 } 1919 1920 /* Now emit any global variables or functions that we have been 1921 putting off. We need to loop in case one of the things emitted 1922 here references another one which comes earlier in the list. */ 1923 do 1924 { 1925 reconsider = 0; 1926 for (i = 0; i < len; i++) 1927 { 1928 decl = vec[i]; 1929 1930 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl)) 1931 continue; 1932 1933 /* Don't write out static consts, unless we still need them. 1934 1935 We also keep static consts if not optimizing (for debugging), 1936 unless the user specified -fno-keep-static-consts. 1937 ??? They might be better written into the debug information. 1938 This is possible when using DWARF. 1939 1940 A language processor that wants static constants to be always 1941 written out (even if it is not used) is responsible for 1942 calling rest_of_decl_compilation itself. E.g. the C front-end 1943 calls rest_of_decl_compilation from finish_decl. 1944 One motivation for this is that is conventional in some 1945 environments to write things like: 1946 static const char rcsid[] = "... version string ..."; 1947 intending to force the string to be in the executable. 1948 1949 A language processor that would prefer to have unneeded 1950 static constants "optimized away" would just defer writing 1951 them out until here. E.g. C++ does this, because static 1952 constants are often defined in header files. 1953 1954 ??? A tempting alternative (for both C and C++) would be 1955 to force a constant to be written if and only if it is 1956 defined in a main file, as opposed to an include file. */ 1957 1958 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)) 1959 { 1960 bool needed = 1; 1961 1962 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))) 1963 /* needed */; 1964 else if (DECL_COMDAT (decl)) 1965 needed = 0; 1966 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl) 1967 && (optimize || !flag_keep_static_consts 1968 || DECL_ARTIFICIAL (decl))) 1969 needed = 0; 1970 1971 if (needed) 1972 { 1973 reconsider = 1; 1974 rest_of_decl_compilation (decl, NULL, 1, 1); 1975 } 1976 } 1977 1978 if (TREE_CODE (decl) == FUNCTION_DECL 1979 && DECL_INITIAL (decl) != 0 1980 && DECL_SAVED_INSNS (decl) != 0 1981 && (flag_keep_inline_functions 1982 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl)) 1983 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))) 1984 { 1985 reconsider = 1; 1986 output_inline_function (decl); 1987 } 1988 } 1989 1990 if (reconsider) 1991 output_something = 1; 1992 } 1993 while (reconsider); 1994 1995 return output_something; 1996} 1997 1998/* Issue appropriate warnings for the global declarations in VEC (of 1999 which there are LEN). Output debugging information for them. */ 2000 2001void 2002check_global_declarations (vec, len) 2003 tree *vec; 2004 int len; 2005{ 2006 tree decl; 2007 int i; 2008 2009 for (i = 0; i < len; i++) 2010 { 2011 decl = vec[i]; 2012 2013 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl) 2014 && ! TREE_ASM_WRITTEN (decl)) 2015 /* Cancel the RTL for this decl so that, if debugging info 2016 output for global variables is still to come, 2017 this one will be omitted. */ 2018 SET_DECL_RTL (decl, NULL_RTX); 2019 2020 /* Warn about any function 2021 declared static but not defined. 2022 We don't warn about variables, 2023 because many programs have static variables 2024 that exist only to get some text into the object file. */ 2025 if (TREE_CODE (decl) == FUNCTION_DECL 2026 && (warn_unused_function 2027 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))) 2028 && DECL_INITIAL (decl) == 0 2029 && DECL_EXTERNAL (decl) 2030 && ! DECL_ARTIFICIAL (decl) 2031 && ! TREE_PUBLIC (decl)) 2032 { 2033 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))) 2034 pedwarn_with_decl (decl, 2035 "`%s' used but never defined"); 2036 else 2037 warning_with_decl (decl, 2038 "`%s' declared `static' but never defined"); 2039 /* This symbol is effectively an "extern" declaration now. */ 2040 TREE_PUBLIC (decl) = 1; 2041 assemble_external (decl); 2042 } 2043 2044 /* Warn about static fns or vars defined but not used, 2045 but not about inline functions or static consts 2046 since defining those in header files is normal practice. */ 2047 if (((warn_unused_function 2048 && TREE_CODE (decl) == FUNCTION_DECL && ! DECL_INLINE (decl)) 2049 || (warn_unused_variable 2050 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl))) 2051 && ! DECL_IN_SYSTEM_HEADER (decl) 2052 && ! DECL_EXTERNAL (decl) 2053 && ! TREE_PUBLIC (decl) 2054 && ! TREE_USED (decl) 2055 && (TREE_CODE (decl) == FUNCTION_DECL || ! DECL_REGISTER (decl)) 2056 /* The TREE_USED bit for file-scope decls 2057 is kept in the identifier, to handle multiple 2058 external decls in different scopes. */ 2059 && ! TREE_USED (DECL_NAME (decl))) 2060 warning_with_decl (decl, "`%s' defined but not used"); 2061 2062 timevar_push (TV_SYMOUT); 2063 (*debug_hooks->global_decl) (decl); 2064 timevar_pop (TV_SYMOUT); 2065 } 2066} 2067 2068/* Save the current INPUT_FILENAME and LINENO on the top entry in the 2069 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the 2070 INPUT_FILENAME and LINENO accordingly. */ 2071 2072void 2073push_srcloc (file, line) 2074 const char *file; 2075 int line; 2076{ 2077 struct file_stack *fs; 2078 2079 if (input_file_stack) 2080 { 2081 input_file_stack->name = input_filename; 2082 input_file_stack->line = lineno; 2083 } 2084 2085 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack)); 2086 fs->name = input_filename = file; 2087 fs->line = lineno = line; 2088 fs->indent_level = 0; 2089 fs->next = input_file_stack; 2090 input_file_stack = fs; 2091 input_file_stack_tick++; 2092} 2093 2094/* Pop the top entry off the stack of presently open source files. 2095 Restore the INPUT_FILENAME and LINENO from the new topmost entry on 2096 the stack. */ 2097 2098void 2099pop_srcloc () 2100{ 2101 struct file_stack *fs; 2102 2103 fs = input_file_stack; 2104 input_file_stack = fs->next; 2105 free (fs); 2106 input_file_stack_tick++; 2107 /* The initial source file is never popped. */ 2108 if (!input_file_stack) 2109 abort (); 2110 input_filename = input_file_stack->name; 2111 lineno = input_file_stack->line; 2112} 2113 2114/* Compile an entire translation unit. Write a file of assembly 2115 output and various debugging dumps. */ 2116 2117static void 2118compile_file () 2119{ 2120 tree globals; 2121 2122 /* Initialize yet another pass. */ 2123 2124 init_final (main_input_filename); 2125 init_branch_prob (dump_base_name); 2126 2127 timevar_push (TV_PARSE); 2128 2129 /* Call the parser, which parses the entire file 2130 (calling rest_of_compilation for each function). */ 2131 yyparse (); 2132 2133 /* In case there were missing block closers, 2134 get us back to the global binding level. */ 2135 (*lang_hooks.clear_binding_stack) (); 2136 2137 /* Compilation is now finished except for writing 2138 what's left of the symbol table output. */ 2139 2140 timevar_pop (TV_PARSE); 2141 2142 if (flag_syntax_only) 2143 return; 2144 2145 globals = getdecls (); 2146 2147 /* Really define vars that have had only a tentative definition. 2148 Really output inline functions that must actually be callable 2149 and have not been output so far. */ 2150 2151 { 2152 int len = list_length (globals); 2153 tree *vec = (tree *) xmalloc (sizeof (tree) * len); 2154 int i; 2155 tree decl; 2156 2157 /* Process the decls in reverse order--earliest first. 2158 Put them into VEC from back to front, then take out from front. */ 2159 2160 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl)) 2161 vec[len - i - 1] = decl; 2162 2163 wrapup_global_declarations (vec, len); 2164 2165 /* This must occur after the loop to output deferred functions. Else 2166 the profiler initializer would not be emitted if all the functions 2167 in this compilation unit were deferred. 2168 2169 output_func_start_profiler can not cause any additional functions or 2170 data to need to be output, so it need not be in the deferred function 2171 loop above. */ 2172 output_func_start_profiler (); 2173 2174 check_global_declarations (vec, len); 2175 2176 /* Clean up. */ 2177 free (vec); 2178 } 2179 2180 /* Write out any pending weak symbol declarations. */ 2181 2182 weak_finish (); 2183 2184 /* Do dbx symbols. */ 2185 timevar_push (TV_SYMOUT); 2186 2187#ifdef DWARF2_UNWIND_INFO 2188 if (dwarf2out_do_frame ()) 2189 dwarf2out_frame_finish (); 2190#endif 2191 2192 (*debug_hooks->finish) (main_input_filename); 2193 timevar_pop (TV_SYMOUT); 2194 2195 /* Output some stuff at end of file if nec. */ 2196 2197 dw2_output_indirect_constants (); 2198 2199 end_final (dump_base_name); 2200 2201 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities) 2202 { 2203 timevar_push (TV_DUMP); 2204 open_dump_file (DFI_bp, NULL); 2205 2206 end_branch_prob (); 2207 2208 close_dump_file (DFI_bp, NULL, NULL_RTX); 2209 timevar_pop (TV_DUMP); 2210 } 2211 2212#ifdef ASM_FILE_END 2213 ASM_FILE_END (asm_out_file); 2214#endif 2215 2216 /* Attach a special .ident directive to the end of the file to identify 2217 the version of GCC which compiled this code. The format of the .ident 2218 string is patterned after the ones produced by native SVR4 compilers. */ 2219#ifdef IDENT_ASM_OP 2220 if (!flag_no_ident) 2221 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n", 2222 IDENT_ASM_OP, version_string); 2223#endif 2224 2225 if (optimize > 0 && open_dump_file (DFI_combine, NULL)) 2226 { 2227 timevar_push (TV_DUMP); 2228 dump_combine_total_stats (rtl_dump_file); 2229 close_dump_file (DFI_combine, NULL, NULL_RTX); 2230 timevar_pop (TV_DUMP); 2231 } 2232} 2233 2234/* This is called from various places for FUNCTION_DECL, VAR_DECL, 2235 and TYPE_DECL nodes. 2236 2237 This does nothing for local (non-static) variables, unless the 2238 variable is a register variable with an ASMSPEC. In that case, or 2239 if the variable is not an automatic, it sets up the RTL and 2240 outputs any assembler code (label definition, storage allocation 2241 and initialization). 2242 2243 DECL is the declaration. If ASMSPEC is nonzero, it specifies 2244 the assembler symbol name to be used. TOP_LEVEL is nonzero 2245 if this declaration is not within a function. */ 2246 2247void 2248rest_of_decl_compilation (decl, asmspec, top_level, at_end) 2249 tree decl; 2250 const char *asmspec; 2251 int top_level; 2252 int at_end; 2253{ 2254 /* Declarations of variables, and of functions defined elsewhere. */ 2255 2256/* The most obvious approach, to put an #ifndef around where 2257 this macro is used, doesn't work since it's inside a macro call. */ 2258#ifndef ASM_FINISH_DECLARE_OBJECT 2259#define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END) 2260#endif 2261 2262 /* We deferred calling assemble_alias so that we could collect 2263 other attributes such as visibility. Emit the alias now. */ 2264 { 2265 tree alias; 2266 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)); 2267 if (alias) 2268 { 2269 alias = TREE_VALUE (TREE_VALUE (alias)); 2270 alias = get_identifier (TREE_STRING_POINTER (alias)); 2271 assemble_alias (decl, alias); 2272 } 2273 } 2274 2275 /* Forward declarations for nested functions are not "external", 2276 but we need to treat them as if they were. */ 2277 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl) 2278 || TREE_CODE (decl) == FUNCTION_DECL) 2279 { 2280 timevar_push (TV_VARCONST); 2281 if (asmspec) 2282 make_decl_rtl (decl, asmspec); 2283 /* Don't output anything 2284 when a tentative file-scope definition is seen. 2285 But at end of compilation, do output code for them. */ 2286 if (at_end || !DECL_DEFER_OUTPUT (decl)) 2287 assemble_variable (decl, top_level, at_end, 0); 2288 if (decl == last_assemble_variable_decl) 2289 { 2290 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl, 2291 top_level, at_end); 2292 } 2293 timevar_pop (TV_VARCONST); 2294 } 2295 else if (DECL_REGISTER (decl) && asmspec != 0) 2296 { 2297 if (decode_reg_name (asmspec) >= 0) 2298 { 2299 SET_DECL_RTL (decl, NULL_RTX); 2300 make_decl_rtl (decl, asmspec); 2301 } 2302 else 2303 { 2304 error ("invalid register name `%s' for register variable", asmspec); 2305 DECL_REGISTER (decl) = 0; 2306 if (!top_level) 2307 expand_decl (decl); 2308 } 2309 } 2310#if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) 2311 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG) 2312 && TREE_CODE (decl) == TYPE_DECL) 2313 { 2314 timevar_push (TV_SYMOUT); 2315 dbxout_symbol (decl, 0); 2316 timevar_pop (TV_SYMOUT); 2317 } 2318#endif 2319#ifdef SDB_DEBUGGING_INFO 2320 else if (write_symbols == SDB_DEBUG && top_level 2321 && TREE_CODE (decl) == TYPE_DECL) 2322 { 2323 timevar_push (TV_SYMOUT); 2324 sdbout_symbol (decl, 0); 2325 timevar_pop (TV_SYMOUT); 2326 } 2327#endif 2328} 2329 2330/* Called after finishing a record, union or enumeral type. */ 2331 2332void 2333rest_of_type_compilation (type, toplev) 2334#if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO) 2335 tree type; 2336 int toplev; 2337#else 2338 tree type ATTRIBUTE_UNUSED; 2339 int toplev ATTRIBUTE_UNUSED; 2340#endif 2341{ 2342 timevar_push (TV_SYMOUT); 2343#if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) 2344 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG) 2345 dbxout_symbol (TYPE_STUB_DECL (type), !toplev); 2346#endif 2347#ifdef SDB_DEBUGGING_INFO 2348 if (write_symbols == SDB_DEBUG) 2349 sdbout_symbol (TYPE_STUB_DECL (type), !toplev); 2350#endif 2351#ifdef DWARF2_DEBUGGING_INFO 2352 if ((write_symbols == DWARF2_DEBUG 2353 || write_symbols == VMS_AND_DWARF2_DEBUG) 2354 && toplev) 2355 dwarf2out_decl (TYPE_STUB_DECL (type)); 2356#endif 2357 timevar_pop (TV_SYMOUT); 2358} 2359 2360/* This is called from finish_function (within yyparse) 2361 after each top-level definition is parsed. 2362 It is supposed to compile that function or variable 2363 and output the assembler code for it. 2364 After we return, the tree storage is freed. */ 2365 2366void 2367rest_of_compilation (decl) 2368 tree decl; 2369{ 2370 rtx insns; 2371 int tem; 2372 int failure = 0; 2373 int rebuild_label_notes_after_reload; 2374 int register_life_up_to_date; 2375 int cleanup_crossjump; 2376 2377 timevar_push (TV_REST_OF_COMPILATION); 2378 2379 /* Now that we're out of the frontend, we shouldn't have any more 2380 CONCATs anywhere. */ 2381 generating_concat_p = 0; 2382 2383 /* When processing delayed functions, prepare_function_start() won't 2384 have been run to re-initialize it. */ 2385 cse_not_expected = ! optimize; 2386 2387 /* First, make sure that NOTE_BLOCK is set correctly for each 2388 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */ 2389 if (!cfun->x_whole_function_mode_p) 2390 identify_blocks (); 2391 2392 /* In function-at-a-time mode, we do not attempt to keep the BLOCK 2393 tree in sensible shape. So, we just recalculate it here. */ 2394 if (cfun->x_whole_function_mode_p) 2395 reorder_blocks (); 2396 2397 init_flow (); 2398 2399 /* If we are reconsidering an inline function 2400 at the end of compilation, skip the stuff for making it inline. */ 2401 2402 if (DECL_SAVED_INSNS (decl) == 0) 2403 { 2404 int inlinable = 0; 2405 tree parent; 2406 const char *lose; 2407 2408 /* If this is nested inside an inlined external function, pretend 2409 it was only declared. Since we cannot inline such functions, 2410 generating code for this one is not only not necessary but will 2411 confuse some debugging output writers. */ 2412 for (parent = DECL_CONTEXT (current_function_decl); 2413 parent != NULL_TREE; 2414 parent = get_containing_scope (parent)) 2415 if (TREE_CODE (parent) == FUNCTION_DECL 2416 && DECL_INLINE (parent) && DECL_EXTERNAL (parent)) 2417 { 2418 DECL_INITIAL (decl) = 0; 2419 goto exit_rest_of_compilation; 2420 } 2421 else if (TYPE_P (parent)) 2422 /* A function in a local class should be treated normally. */ 2423 break; 2424 2425 /* If requested, consider whether to make this function inline. */ 2426 if ((DECL_INLINE (decl) && !flag_no_inline) 2427 || flag_inline_functions) 2428 { 2429 timevar_push (TV_INTEGRATION); 2430 lose = function_cannot_inline_p (decl); 2431 timevar_pop (TV_INTEGRATION); 2432 if (lose || ! optimize) 2433 { 2434 if (warn_inline && DECL_INLINE (decl)) 2435 warning_with_decl (decl, lose); 2436 DECL_ABSTRACT_ORIGIN (decl) = 0; 2437 /* Don't really compile an extern inline function. 2438 If we can't make it inline, pretend 2439 it was only declared. */ 2440 if (DECL_EXTERNAL (decl)) 2441 { 2442 DECL_INITIAL (decl) = 0; 2443 goto exit_rest_of_compilation; 2444 } 2445 } 2446 else 2447 /* ??? Note that this has the effect of making it look 2448 like "inline" was specified for a function if we choose 2449 to inline it. This isn't quite right, but it's 2450 probably not worth the trouble to fix. */ 2451 inlinable = DECL_INLINE (decl) = 1; 2452 } 2453 2454 insns = get_insns (); 2455 2456 /* Dump the rtl code if we are dumping rtl. */ 2457 2458 if (open_dump_file (DFI_rtl, decl)) 2459 { 2460 if (DECL_SAVED_INSNS (decl)) 2461 fprintf (rtl_dump_file, ";; (integrable)\n\n"); 2462 close_dump_file (DFI_rtl, print_rtl, insns); 2463 } 2464 2465 /* Convert from NOTE_INSN_EH_REGION style notes, and do other 2466 sorts of eh initialization. Delay this until after the 2467 initial rtl dump so that we can see the original nesting. */ 2468 convert_from_eh_region_ranges (); 2469 2470 /* If function is inline, and we don't yet know whether to 2471 compile it by itself, defer decision till end of compilation. 2472 finish_compilation will call rest_of_compilation again 2473 for those functions that need to be output. Also defer those 2474 functions that we are supposed to defer. */ 2475 2476 if (inlinable 2477 || (DECL_INLINE (decl) 2478 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl) 2479 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) 2480 && ! flag_keep_inline_functions) 2481 || DECL_EXTERNAL (decl)))) 2482 DECL_DEFER_OUTPUT (decl) = 1; 2483 2484 if (DECL_INLINE (decl)) 2485 /* DWARF wants separate debugging info for abstract and 2486 concrete instances of all inline functions, including those 2487 declared inline but not inlined, and those inlined even 2488 though they weren't declared inline. Conveniently, that's 2489 what DECL_INLINE means at this point. */ 2490 (*debug_hooks->deferred_inline_function) (decl); 2491 2492 if (DECL_DEFER_OUTPUT (decl)) 2493 { 2494 /* If -Wreturn-type, we have to do a bit of compilation. We just 2495 want to call cleanup the cfg to figure out whether or not we can 2496 fall off the end of the function; we do the minimum amount of 2497 work necessary to make that safe. */ 2498 if (warn_return_type) 2499 { 2500 int saved_optimize = optimize; 2501 2502 optimize = 0; 2503 rebuild_jump_labels (insns); 2504 find_exception_handler_labels (); 2505 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2506 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP); 2507 optimize = saved_optimize; 2508 2509 /* CFG is no longer maintained up-to-date. */ 2510 free_bb_for_insn (); 2511 } 2512 2513 current_function_nothrow = nothrow_function_p (); 2514 if (current_function_nothrow) 2515 /* Now we know that this can't throw; set the flag for the benefit 2516 of other functions later in this translation unit. */ 2517 TREE_NOTHROW (current_function_decl) = 1; 2518 2519 timevar_push (TV_INTEGRATION); 2520 save_for_inline (decl); 2521 timevar_pop (TV_INTEGRATION); 2522 DECL_SAVED_INSNS (decl)->inlinable = inlinable; 2523 goto exit_rest_of_compilation; 2524 } 2525 2526 /* If specified extern inline but we aren't inlining it, we are 2527 done. This goes for anything that gets here with DECL_EXTERNAL 2528 set, not just things with DECL_INLINE. */ 2529 if (DECL_EXTERNAL (decl)) 2530 goto exit_rest_of_compilation; 2531 } 2532 2533 /* If we're emitting a nested function, make sure its parent gets 2534 emitted as well. Doing otherwise confuses debug info. */ 2535 { 2536 tree parent; 2537 for (parent = DECL_CONTEXT (current_function_decl); 2538 parent != NULL_TREE; 2539 parent = get_containing_scope (parent)) 2540 if (TREE_CODE (parent) == FUNCTION_DECL) 2541 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1; 2542 } 2543 2544 /* We are now committed to emitting code for this function. Do any 2545 preparation, such as emitting abstract debug info for the inline 2546 before it gets mangled by optimization. */ 2547 if (DECL_INLINE (decl)) 2548 (*debug_hooks->outlining_inline_function) (decl); 2549 2550 /* Remove any notes we don't need. That will make iterating 2551 over the instruction sequence faster, and allow the garbage 2552 collector to reclaim the memory used by the notes. */ 2553 remove_unnecessary_notes (); 2554 reorder_blocks (); 2555 2556 ggc_collect (); 2557 2558 /* Initialize some variables used by the optimizers. */ 2559 init_function_for_compilation (); 2560 2561 if (! DECL_DEFER_OUTPUT (decl)) 2562 TREE_ASM_WRITTEN (decl) = 1; 2563 2564 /* Now that integrate will no longer see our rtl, we need not 2565 distinguish between the return value of this function and the 2566 return value of called functions. Also, we can remove all SETs 2567 of subregs of hard registers; they are only here because of 2568 integrate. Also, we can now initialize pseudos intended to 2569 carry magic hard reg data throughout the function. */ 2570 rtx_equal_function_value_matters = 0; 2571 purge_hard_subreg_sets (get_insns ()); 2572 2573 /* Early return if there were errors. We can run afoul of our 2574 consistency checks, and there's not really much point in fixing them. 2575 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */ 2576 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type) 2577 || errorcount || sorrycount) 2578 goto exit_rest_of_compilation; 2579 2580 /* We may have potential sibling or tail recursion sites. Select one 2581 (of possibly multiple) methods of performing the call. */ 2582 if (flag_optimize_sibling_calls) 2583 { 2584 timevar_push (TV_JUMP); 2585 open_dump_file (DFI_sibling, decl); 2586 2587 optimize_sibling_and_tail_recursive_calls (); 2588 2589 close_dump_file (DFI_sibling, print_rtl, get_insns ()); 2590 timevar_pop (TV_JUMP); 2591 } 2592 2593 /* Complete generation of exception handling code. */ 2594 find_exception_handler_labels (); 2595 if (doing_eh (0)) 2596 { 2597 timevar_push (TV_JUMP); 2598 open_dump_file (DFI_eh, decl); 2599 2600 finish_eh_generation (); 2601 2602 close_dump_file (DFI_eh, print_rtl, get_insns ()); 2603 timevar_pop (TV_JUMP); 2604 } 2605 2606 /* Delay emitting hard_reg_initial_value sets until after EH landing pad 2607 generation, which might create new sets. */ 2608 emit_initial_value_sets (); 2609 2610#ifdef FINALIZE_PIC 2611 /* If we are doing position-independent code generation, now 2612 is the time to output special prologues and epilogues. 2613 We do not want to do this earlier, because it just clutters 2614 up inline functions with meaningless insns. */ 2615 if (flag_pic) 2616 FINALIZE_PIC; 2617#endif 2618 2619 insns = get_insns (); 2620 2621 /* Copy any shared structure that should not be shared. */ 2622 unshare_all_rtl (current_function_decl, insns); 2623 2624#ifdef SETJMP_VIA_SAVE_AREA 2625 /* This must be performed before virtual register instantiation. */ 2626 if (current_function_calls_alloca) 2627 optimize_save_area_alloca (insns); 2628#endif 2629 2630 /* Instantiate all virtual registers. */ 2631 instantiate_virtual_regs (current_function_decl, insns); 2632 2633 open_dump_file (DFI_jump, decl); 2634 2635 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields 2636 are initialized and to compute whether control can drop off the end 2637 of the function. */ 2638 2639 timevar_push (TV_JUMP); 2640 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this 2641 before jump optimization switches branch directions. */ 2642 expected_value_to_br_prob (); 2643 2644 reg_scan (insns, max_reg_num (), 0); 2645 rebuild_jump_labels (insns); 2646 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2647 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP); 2648 2649 /* CFG is no longer maintained up-to-date. */ 2650 free_bb_for_insn (); 2651 copy_loop_headers (insns); 2652 purge_line_number_notes (insns); 2653 2654 timevar_pop (TV_JUMP); 2655 2656 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */ 2657 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl)) 2658 { 2659 close_dump_file (DFI_jump, print_rtl, insns); 2660 goto exit_rest_of_compilation; 2661 } 2662 2663 /* Long term, this should probably move before the jump optimizer too, 2664 but I didn't want to disturb the rtl_dump_and_exit and related 2665 stuff at this time. */ 2666 if (optimize > 0 && flag_ssa) 2667 { 2668 /* Convert to SSA form. */ 2669 2670 timevar_push (TV_TO_SSA); 2671 open_dump_file (DFI_ssa, decl); 2672 2673 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2674 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP); 2675 convert_to_ssa (); 2676 2677 close_dump_file (DFI_ssa, print_rtl_with_bb, insns); 2678 timevar_pop (TV_TO_SSA); 2679 2680 /* Perform sparse conditional constant propagation, if requested. */ 2681 if (flag_ssa_ccp) 2682 { 2683 timevar_push (TV_SSA_CCP); 2684 open_dump_file (DFI_ssa_ccp, decl); 2685 2686 ssa_const_prop (); 2687 2688 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ()); 2689 timevar_pop (TV_SSA_CCP); 2690 } 2691 2692 /* It would be useful to cleanup the CFG at this point, but block 2693 merging and possibly other transformations might leave a PHI 2694 node in the middle of a basic block, which is a strict no-no. */ 2695 2696 /* The SSA implementation uses basic block numbers in its phi 2697 nodes. Thus, changing the control-flow graph or the basic 2698 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (), 2699 may cause problems. */ 2700 2701 if (flag_ssa_dce) 2702 { 2703 /* Remove dead code. */ 2704 2705 timevar_push (TV_SSA_DCE); 2706 open_dump_file (DFI_ssa_dce, decl); 2707 2708 insns = get_insns (); 2709 ssa_eliminate_dead_code(); 2710 2711 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns); 2712 timevar_pop (TV_SSA_DCE); 2713 } 2714 2715 /* Convert from SSA form. */ 2716 2717 timevar_push (TV_FROM_SSA); 2718 open_dump_file (DFI_ussa, decl); 2719 2720 convert_from_ssa (); 2721 /* New registers have been created. Rescan their usage. */ 2722 reg_scan (insns, max_reg_num (), 1); 2723 2724 close_dump_file (DFI_ussa, print_rtl_with_bb, insns); 2725 timevar_pop (TV_FROM_SSA); 2726 2727 ggc_collect (); 2728 /* CFG is no longer maintained up-to-date. */ 2729 free_bb_for_insn (); 2730 } 2731 2732 timevar_push (TV_JUMP); 2733 2734 if (optimize > 0) 2735 { 2736 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2737 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP 2738 | (flag_thread_jumps ? CLEANUP_THREADING : 0)); 2739 2740 /* ??? Run if-conversion before delete_null_pointer_checks, 2741 since the later does not preserve the CFG. This should 2742 be changed -- no since converting if's that are going to 2743 be deleted. */ 2744 timevar_push (TV_IFCVT); 2745 if_convert (0); 2746 timevar_pop (TV_IFCVT); 2747 2748 /* CFG is no longer maintained up-to-date. */ 2749 free_bb_for_insn (); 2750 /* Try to identify useless null pointer tests and delete them. */ 2751 if (flag_delete_null_pointer_checks) 2752 delete_null_pointer_checks (insns); 2753 } 2754 2755 /* Jump optimization, and the removal of NULL pointer checks, may 2756 have reduced the number of instructions substantially. CSE, and 2757 future passes, allocate arrays whose dimensions involve the 2758 maximum instruction UID, so if we can reduce the maximum UID 2759 we'll save big on memory. */ 2760 renumber_insns (rtl_dump_file); 2761 timevar_pop (TV_JUMP); 2762 2763 close_dump_file (DFI_jump, print_rtl, insns); 2764 2765 ggc_collect (); 2766 2767 /* Perform common subexpression elimination. 2768 Nonzero value from `cse_main' means that jumps were simplified 2769 and some code may now be unreachable, so do 2770 jump optimization again. */ 2771 2772 if (optimize > 0) 2773 { 2774 open_dump_file (DFI_cse, decl); 2775 timevar_push (TV_CSE); 2776 2777 reg_scan (insns, max_reg_num (), 1); 2778 2779 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file); 2780 2781 /* If we are not running more CSE passes, then we are no longer 2782 expecting CSE to be run. But always rerun it in a cheap mode. */ 2783 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse; 2784 2785 if (tem || optimize > 1) 2786 { 2787 timevar_push (TV_JUMP); 2788 rebuild_jump_labels (insns); 2789 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2790 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP); 2791 timevar_pop (TV_JUMP); 2792 /* CFG is no longer maintained up-to-date. */ 2793 free_bb_for_insn (); 2794 } 2795 2796 /* Run this after jump optmizations remove all the unreachable code 2797 so that unreachable code will not keep values live. */ 2798 delete_trivially_dead_insns (insns, max_reg_num (), 0); 2799 2800 /* Try to identify useless null pointer tests and delete them. */ 2801 if (flag_delete_null_pointer_checks || flag_thread_jumps) 2802 { 2803 timevar_push (TV_JUMP); 2804 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2805 2806 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP 2807 | (flag_thread_jumps ? CLEANUP_THREADING : 0)); 2808 2809 if (flag_delete_null_pointer_checks) 2810 delete_null_pointer_checks (insns); 2811 /* CFG is no longer maintained up-to-date. */ 2812 free_bb_for_insn (); 2813 timevar_pop (TV_JUMP); 2814 } 2815 2816 /* The second pass of jump optimization is likely to have 2817 removed a bunch more instructions. */ 2818 renumber_insns (rtl_dump_file); 2819 2820 timevar_pop (TV_CSE); 2821 close_dump_file (DFI_cse, print_rtl, insns); 2822 } 2823 2824 open_dump_file (DFI_addressof, decl); 2825 2826 purge_addressof (insns); 2827 reg_scan (insns, max_reg_num (), 1); 2828 2829 close_dump_file (DFI_addressof, print_rtl, insns); 2830 2831 ggc_collect (); 2832 2833 /* Perform global cse. */ 2834 2835 if (optimize > 0 && flag_gcse) 2836 { 2837 int save_csb, save_cfj; 2838 int tem2 = 0; 2839 2840 timevar_push (TV_GCSE); 2841 open_dump_file (DFI_gcse, decl); 2842 2843 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2844 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP); 2845 tem = gcse_main (insns, rtl_dump_file); 2846 rebuild_jump_labels (insns); 2847 2848 save_csb = flag_cse_skip_blocks; 2849 save_cfj = flag_cse_follow_jumps; 2850 flag_cse_skip_blocks = flag_cse_follow_jumps = 0; 2851 2852 /* CFG is no longer maintained up-to-date. */ 2853 free_bb_for_insn (); 2854 /* If -fexpensive-optimizations, re-run CSE to clean up things done 2855 by gcse. */ 2856 if (flag_expensive_optimizations) 2857 { 2858 timevar_push (TV_CSE); 2859 reg_scan (insns, max_reg_num (), 1); 2860 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file); 2861 timevar_pop (TV_CSE); 2862 cse_not_expected = !flag_rerun_cse_after_loop; 2863 } 2864 2865 /* If gcse or cse altered any jumps, rerun jump optimizations to clean 2866 things up. Then possibly re-run CSE again. */ 2867 while (tem || tem2) 2868 { 2869 tem = tem2 = 0; 2870 timevar_push (TV_JUMP); 2871 rebuild_jump_labels (insns); 2872 delete_trivially_dead_insns (insns, max_reg_num (), 0); 2873 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2874 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP); 2875 /* CFG is no longer maintained up-to-date. */ 2876 free_bb_for_insn (); 2877 timevar_pop (TV_JUMP); 2878 2879 if (flag_expensive_optimizations) 2880 { 2881 timevar_push (TV_CSE); 2882 reg_scan (insns, max_reg_num (), 1); 2883 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file); 2884 timevar_pop (TV_CSE); 2885 } 2886 } 2887 2888 close_dump_file (DFI_gcse, print_rtl, insns); 2889 timevar_pop (TV_GCSE); 2890 2891 ggc_collect (); 2892 flag_cse_skip_blocks = save_csb; 2893 flag_cse_follow_jumps = save_cfj; 2894 } 2895 2896 /* Move constant computations out of loops. */ 2897 2898 if (optimize > 0) 2899 { 2900 timevar_push (TV_LOOP); 2901 open_dump_file (DFI_loop, decl); 2902 free_bb_for_insn (); 2903 2904 if (flag_rerun_loop_opt) 2905 { 2906 cleanup_barriers (); 2907 2908 /* We only want to perform unrolling once. */ 2909 loop_optimize (insns, rtl_dump_file, LOOP_FIRST_PASS); 2910 2911 /* The first call to loop_optimize makes some instructions 2912 trivially dead. We delete those instructions now in the 2913 hope that doing so will make the heuristics in loop work 2914 better and possibly speed up compilation. */ 2915 delete_trivially_dead_insns (insns, max_reg_num (), 0); 2916 2917 /* The regscan pass is currently necessary as the alias 2918 analysis code depends on this information. */ 2919 reg_scan (insns, max_reg_num (), 1); 2920 } 2921 cleanup_barriers (); 2922 loop_optimize (insns, rtl_dump_file, 2923 (flag_unroll_loops ? LOOP_UNROLL : 0) | LOOP_BCT 2924 | (flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0)); 2925 2926 close_dump_file (DFI_loop, print_rtl, insns); 2927 timevar_pop (TV_LOOP); 2928 2929 ggc_collect (); 2930 } 2931 2932 if (optimize > 0) 2933 { 2934 timevar_push (TV_CSE2); 2935 open_dump_file (DFI_cse2, decl); 2936 2937 if (flag_rerun_cse_after_loop) 2938 { 2939 /* Running another jump optimization pass before the second 2940 cse pass sometimes simplifies the RTL enough to allow 2941 the second CSE pass to do a better job. Jump_optimize can change 2942 max_reg_num so we must rerun reg_scan afterwards. 2943 ??? Rework to not call reg_scan so often. */ 2944 timevar_push (TV_JUMP); 2945 2946 /* The previous call to loop_optimize makes some instructions 2947 trivially dead. We delete those instructions now in the 2948 hope that doing so will make the heuristics in jump work 2949 better and possibly speed up compilation. */ 2950 delete_trivially_dead_insns (insns, max_reg_num (), 0); 2951 2952 reg_scan (insns, max_reg_num (), 0); 2953 2954 timevar_push (TV_IFCVT); 2955 2956 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2957 cleanup_cfg (CLEANUP_EXPENSIVE); 2958 if_convert (0); 2959 2960 timevar_pop(TV_IFCVT); 2961 2962 timevar_pop (TV_JUMP); 2963 2964 /* CFG is no longer maintained up-to-date. */ 2965 free_bb_for_insn (); 2966 reg_scan (insns, max_reg_num (), 0); 2967 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file); 2968 2969 if (tem) 2970 { 2971 timevar_push (TV_JUMP); 2972 rebuild_jump_labels (insns); 2973 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2974 cleanup_cfg (CLEANUP_EXPENSIVE); 2975 /* CFG is no longer maintained up-to-date. */ 2976 free_bb_for_insn (); 2977 timevar_pop (TV_JUMP); 2978 } 2979 } 2980 2981 close_dump_file (DFI_cse2, print_rtl, insns); 2982 timevar_pop (TV_CSE2); 2983 2984 ggc_collect (); 2985 } 2986 2987 cse_not_expected = 1; 2988 2989 regclass_init (); 2990 2991 /* Do control and data flow analysis; wrote some of the results to 2992 the dump file. */ 2993 2994 timevar_push (TV_FLOW); 2995 open_dump_file (DFI_cfg, decl); 2996 2997 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2998 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) 2999 | (flag_thread_jumps ? CLEANUP_THREADING : 0)); 3000 check_function_return_warnings (); 3001 3002 /* It may make more sense to mark constant functions after dead code is 3003 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs 3004 may insert code making function non-constant, but we still must consider 3005 it as constant, otherwise -fbranch-probabilities will not read data back. 3006 3007 life_analyzis rarely eliminates modification of external memory. 3008 */ 3009 mark_constant_function (); 3010 3011 close_dump_file (DFI_cfg, print_rtl_with_bb, insns); 3012 3013 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities) 3014 { 3015 timevar_push (TV_BRANCH_PROB); 3016 open_dump_file (DFI_bp, decl); 3017 3018 branch_prob (); 3019 3020 close_dump_file (DFI_bp, print_rtl_with_bb, insns); 3021 timevar_pop (TV_BRANCH_PROB); 3022 } 3023 3024 open_dump_file (DFI_life, decl); 3025 if (optimize) 3026 { 3027 struct loops loops; 3028 3029 /* Discover and record the loop depth at the head of each basic 3030 block. The loop infrastructure does the real job for us. */ 3031 flow_loops_find (&loops, LOOP_TREE); 3032 3033 if (rtl_dump_file) 3034 flow_loops_dump (&loops, rtl_dump_file, NULL, 0); 3035 3036 /* Estimate using heuristics if no profiling info is available. */ 3037 if (flag_guess_branch_prob) 3038 estimate_probability (&loops); 3039 3040 flow_loops_free (&loops); 3041 } 3042 life_analysis (insns, rtl_dump_file, PROP_FINAL); 3043 timevar_pop (TV_FLOW); 3044 3045 no_new_pseudos = 1; 3046 3047 if (warn_uninitialized || extra_warnings) 3048 { 3049 uninitialized_vars_warning (DECL_INITIAL (decl)); 3050 if (extra_warnings) 3051 setjmp_args_warning (); 3052 } 3053 3054 if (optimize) 3055 { 3056 if (initialize_uninitialized_subregs ()) 3057 { 3058 /* Insns were inserted, so things might look a bit different. */ 3059 insns = get_insns (); 3060 life_analysis (insns, rtl_dump_file, 3061 (PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES)); 3062 } 3063 } 3064 3065 close_dump_file (DFI_life, print_rtl_with_bb, insns); 3066 3067 ggc_collect (); 3068 3069 /* If -opt, try combining insns through substitution. */ 3070 3071 if (optimize > 0) 3072 { 3073 int rebuild_jump_labels_after_combine = 0; 3074 3075 timevar_push (TV_COMBINE); 3076 open_dump_file (DFI_combine, decl); 3077 3078 rebuild_jump_labels_after_combine 3079 = combine_instructions (insns, max_reg_num ()); 3080 3081 /* Always purge dead edges, as we may eliminate an insn throwing 3082 exception. */ 3083 rebuild_jump_labels_after_combine |= purge_all_dead_edges (true); 3084 3085 /* Combining insns may have turned an indirect jump into a 3086 direct jump. Rebuid the JUMP_LABEL fields of jumping 3087 instructions. */ 3088 if (rebuild_jump_labels_after_combine) 3089 { 3090 timevar_push (TV_JUMP); 3091 rebuild_jump_labels (insns); 3092 timevar_pop (TV_JUMP); 3093 3094 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE); 3095 } 3096 3097 close_dump_file (DFI_combine, print_rtl_with_bb, insns); 3098 timevar_pop (TV_COMBINE); 3099 3100 ggc_collect (); 3101 } 3102 3103 /* Rerun if-conversion, as combine may have simplified things enough to 3104 now meet sequence length restrictions. */ 3105 if (optimize > 0) 3106 { 3107 timevar_push (TV_IFCVT); 3108 open_dump_file (DFI_ce, decl); 3109 3110 no_new_pseudos = 0; 3111 if_convert (1); 3112 no_new_pseudos = 1; 3113 3114 close_dump_file (DFI_ce, print_rtl_with_bb, insns); 3115 timevar_pop (TV_IFCVT); 3116 } 3117 3118 /* Register allocation pre-pass, to reduce number of moves 3119 necessary for two-address machines. */ 3120 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations)) 3121 { 3122 timevar_push (TV_REGMOVE); 3123 open_dump_file (DFI_regmove, decl); 3124 3125 regmove_optimize (insns, max_reg_num (), rtl_dump_file); 3126 3127 close_dump_file (DFI_regmove, print_rtl_with_bb, insns); 3128 timevar_pop (TV_REGMOVE); 3129 3130 ggc_collect (); 3131 } 3132 3133 /* Do unconditional splitting before register allocation to allow machine 3134 description to add extra information not needed previously. */ 3135 split_all_insns (1); 3136 3137 /* Any of the several passes since flow1 will have munged register 3138 lifetime data a bit. */ 3139 register_life_up_to_date = 0; 3140 3141#ifdef OPTIMIZE_MODE_SWITCHING 3142 timevar_push (TV_MODE_SWITCH); 3143 3144 no_new_pseudos = 0; 3145 if (optimize_mode_switching (NULL)) 3146 { 3147 /* We did work, and so had to regenerate global life information. 3148 Take advantage of this and don't re-recompute register life 3149 information below. */ 3150 register_life_up_to_date = 1; 3151 } 3152 no_new_pseudos = 1; 3153 3154 timevar_pop (TV_MODE_SWITCH); 3155#endif 3156 3157 timevar_push (TV_SCHED); 3158 3159#ifdef INSN_SCHEDULING 3160 3161 /* Print function header into sched dump now 3162 because doing the sched analysis makes some of the dump. */ 3163 if (optimize > 0 && flag_schedule_insns) 3164 { 3165 open_dump_file (DFI_sched, decl); 3166 3167 /* Do control and data sched analysis, 3168 and write some of the results to dump file. */ 3169 3170 schedule_insns (rtl_dump_file); 3171 3172 close_dump_file (DFI_sched, print_rtl_with_bb, insns); 3173 3174 /* Register lifetime information was updated as part of verifying 3175 the schedule. */ 3176 register_life_up_to_date = 1; 3177 } 3178#endif 3179 timevar_pop (TV_SCHED); 3180 3181 ggc_collect (); 3182 3183 /* Determine if the current function is a leaf before running reload 3184 since this can impact optimizations done by the prologue and 3185 epilogue thus changing register elimination offsets. */ 3186 current_function_is_leaf = leaf_function_p (); 3187 3188 timevar_push (TV_LOCAL_ALLOC); 3189 open_dump_file (DFI_lreg, decl); 3190 3191 /* Allocate pseudo-regs that are used only within 1 basic block. 3192 3193 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the 3194 jump optimizer after register allocation and reloading are finished. */ 3195 3196 if (! register_life_up_to_date) 3197 recompute_reg_usage (insns, ! optimize_size); 3198 3199 /* Allocate the reg_renumber array. */ 3200 allocate_reg_info (max_regno, FALSE, TRUE); 3201 3202 /* And the reg_equiv_memory_loc array. */ 3203 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx)); 3204 3205 allocate_initial_values (reg_equiv_memory_loc); 3206 3207 regclass (insns, max_reg_num (), rtl_dump_file); 3208 rebuild_label_notes_after_reload = local_alloc (); 3209 3210 timevar_pop (TV_LOCAL_ALLOC); 3211 3212 if (dump_file[DFI_lreg].enabled) 3213 { 3214 timevar_push (TV_DUMP); 3215 3216 dump_flow_info (rtl_dump_file); 3217 dump_local_alloc (rtl_dump_file); 3218 3219 close_dump_file (DFI_lreg, print_rtl_with_bb, insns); 3220 timevar_pop (TV_DUMP); 3221 } 3222 3223 ggc_collect (); 3224 3225 timevar_push (TV_GLOBAL_ALLOC); 3226 open_dump_file (DFI_greg, decl); 3227 3228 /* If optimizing, allocate remaining pseudo-regs. Do the reload 3229 pass fixing up any insns that are invalid. */ 3230 3231 if (optimize) 3232 failure = global_alloc (rtl_dump_file); 3233 else 3234 { 3235 build_insn_chain (insns); 3236 failure = reload (insns, 0); 3237 } 3238 3239 timevar_pop (TV_GLOBAL_ALLOC); 3240 3241 if (dump_file[DFI_greg].enabled) 3242 { 3243 timevar_push (TV_DUMP); 3244 3245 dump_global_regs (rtl_dump_file); 3246 3247 close_dump_file (DFI_greg, print_rtl_with_bb, insns); 3248 timevar_pop (TV_DUMP); 3249 } 3250 3251 if (failure) 3252 goto exit_rest_of_compilation; 3253 3254 ggc_collect (); 3255 3256 open_dump_file (DFI_postreload, decl); 3257 3258 /* Do a very simple CSE pass over just the hard registers. */ 3259 if (optimize > 0) 3260 { 3261 timevar_push (TV_RELOAD_CSE_REGS); 3262 reload_cse_regs (insns); 3263 timevar_pop (TV_RELOAD_CSE_REGS); 3264 } 3265 3266 /* Register allocation and reloading may have turned an indirect jump into 3267 a direct jump. If so, we must rebuild the JUMP_LABEL fields of 3268 jumping instructions. */ 3269 if (rebuild_label_notes_after_reload) 3270 { 3271 timevar_push (TV_JUMP); 3272 3273 rebuild_jump_labels (insns); 3274 3275 timevar_pop (TV_JUMP); 3276 } 3277 3278 close_dump_file (DFI_postreload, print_rtl_with_bb, insns); 3279 3280 /* Re-create the death notes which were deleted during reload. */ 3281 timevar_push (TV_FLOW2); 3282 open_dump_file (DFI_flow2, decl); 3283 3284#ifdef ENABLE_CHECKING 3285 verify_flow_info (); 3286#endif 3287 3288 /* If optimizing, then go ahead and split insns now. */ 3289 if (optimize > 0) 3290 split_all_insns (0); 3291 3292 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0); 3293 3294 /* On some machines, the prologue and epilogue code, or parts thereof, 3295 can be represented as RTL. Doing so lets us schedule insns between 3296 it and the rest of the code and also allows delayed branch 3297 scheduling to operate in the epilogue. */ 3298 thread_prologue_and_epilogue_insns (insns); 3299 3300 /* Cross-jumping is O(N^3) on the number of edges, thus trying to 3301 perform cross-jumping on flow graphs which have a high connectivity 3302 will take a long time. This is similar to the test to disable GCSE. */ 3303 cleanup_crossjump = CLEANUP_CROSSJUMP; 3304 if (n_basic_blocks > 1000 && n_edges / n_basic_blocks >= 20) 3305 { 3306 if (optimize && warn_disabled_optimization) 3307 warning ("crossjump disabled: %d > 1000 basic blocks and %d >= 20 edges/basic block", 3308 n_basic_blocks, n_edges / n_basic_blocks); 3309 cleanup_crossjump = 0; 3310 } 3311 3312 if (optimize) 3313 { 3314 cleanup_cfg (CLEANUP_EXPENSIVE | cleanup_crossjump); 3315 life_analysis (insns, rtl_dump_file, PROP_FINAL); 3316 3317 /* This is kind of a heuristic. We need to run combine_stack_adjustments 3318 even for machines with possibly nonzero RETURN_POPS_ARGS 3319 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having 3320 push instructions will have popping returns. */ 3321#ifndef PUSH_ROUNDING 3322 if (!ACCUMULATE_OUTGOING_ARGS) 3323#endif 3324 combine_stack_adjustments (); 3325 3326 ggc_collect (); 3327 } 3328 3329 flow2_completed = 1; 3330 3331 close_dump_file (DFI_flow2, print_rtl_with_bb, insns); 3332 timevar_pop (TV_FLOW2); 3333 3334#ifdef HAVE_peephole2 3335 if (optimize > 0 && flag_peephole2) 3336 { 3337 timevar_push (TV_PEEPHOLE2); 3338 open_dump_file (DFI_peephole2, decl); 3339 3340 peephole2_optimize (rtl_dump_file); 3341 3342 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns); 3343 timevar_pop (TV_PEEPHOLE2); 3344 } 3345#endif 3346 3347 if (optimize > 0 && (flag_rename_registers || flag_cprop_registers)) 3348 { 3349 timevar_push (TV_RENAME_REGISTERS); 3350 open_dump_file (DFI_rnreg, decl); 3351 3352 if (flag_rename_registers) 3353 regrename_optimize (); 3354 if (flag_cprop_registers) 3355 copyprop_hardreg_forward (); 3356 3357 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns); 3358 timevar_pop (TV_RENAME_REGISTERS); 3359 } 3360 3361 if (optimize > 0) 3362 { 3363 timevar_push (TV_IFCVT2); 3364 open_dump_file (DFI_ce2, decl); 3365 3366 if_convert (1); 3367 3368 close_dump_file (DFI_ce2, print_rtl_with_bb, insns); 3369 timevar_pop (TV_IFCVT2); 3370 } 3371#ifdef STACK_REGS 3372 if (optimize) 3373 split_all_insns (1); 3374#endif 3375 3376#ifdef INSN_SCHEDULING 3377 if (optimize > 0 && flag_schedule_insns_after_reload) 3378 { 3379 timevar_push (TV_SCHED2); 3380 open_dump_file (DFI_sched2, decl); 3381 3382 /* Do control and data sched analysis again, 3383 and write some more of the results to dump file. */ 3384 3385 split_all_insns (1); 3386 3387 schedule_insns (rtl_dump_file); 3388 3389 close_dump_file (DFI_sched2, print_rtl_with_bb, insns); 3390 timevar_pop (TV_SCHED2); 3391 3392 ggc_collect (); 3393 } 3394#endif 3395 3396#ifdef LEAF_REGISTERS 3397 current_function_uses_only_leaf_regs 3398 = optimize > 0 && only_leaf_regs_used () && leaf_function_p (); 3399#endif 3400 3401#ifdef STACK_REGS 3402 timevar_push (TV_REG_STACK); 3403 open_dump_file (DFI_stack, decl); 3404 3405 reg_to_stack (insns, rtl_dump_file); 3406 3407 close_dump_file (DFI_stack, print_rtl_with_bb, insns); 3408 timevar_pop (TV_REG_STACK); 3409 3410 ggc_collect (); 3411#endif 3412 if (optimize > 0) 3413 { 3414 timevar_push (TV_REORDER_BLOCKS); 3415 open_dump_file (DFI_bbro, decl); 3416 3417 /* Last attempt to optimize CFG, as life analysis possibly removed 3418 some instructions. Note that we can't rerun crossjump at this 3419 point, because it can turn a switch into a direct branch, which 3420 can leave the tablejump address calculation in the code, which 3421 can lead to referencing an undefined label. */ 3422 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK); 3423 if (flag_reorder_blocks) 3424 { 3425 reorder_basic_blocks (); 3426 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK); 3427 } 3428 3429 close_dump_file (DFI_bbro, print_rtl_with_bb, insns); 3430 timevar_pop (TV_REORDER_BLOCKS); 3431 } 3432 compute_alignments (); 3433 3434 /* CFG is no longer maintained up-to-date. */ 3435 free_bb_for_insn (); 3436 3437 /* If a machine dependent reorganization is needed, call it. */ 3438#ifdef MACHINE_DEPENDENT_REORG 3439 timevar_push (TV_MACH_DEP); 3440 open_dump_file (DFI_mach, decl); 3441 3442 MACHINE_DEPENDENT_REORG (insns); 3443 3444 close_dump_file (DFI_mach, print_rtl, insns); 3445 timevar_pop (TV_MACH_DEP); 3446 3447 ggc_collect (); 3448#endif 3449 3450 purge_line_number_notes (insns); 3451 cleanup_barriers (); 3452 3453 /* If a scheduling pass for delayed branches is to be done, 3454 call the scheduling code. */ 3455 3456#ifdef DELAY_SLOTS 3457 if (optimize > 0 && flag_delayed_branch) 3458 { 3459 timevar_push (TV_DBR_SCHED); 3460 open_dump_file (DFI_dbr, decl); 3461 3462 dbr_schedule (insns, rtl_dump_file); 3463 3464 close_dump_file (DFI_dbr, print_rtl, insns); 3465 timevar_pop (TV_DBR_SCHED); 3466 3467 ggc_collect (); 3468 } 3469#endif 3470 3471#if defined (HAVE_ATTR_length) && !defined (STACK_REGS) 3472 timevar_push (TV_SHORTEN_BRANCH); 3473 split_all_insns_noflow (); 3474 timevar_pop (TV_SHORTEN_BRANCH); 3475#endif 3476 3477 convert_to_eh_region_ranges (); 3478 3479 /* Shorten branches. */ 3480 timevar_push (TV_SHORTEN_BRANCH); 3481 shorten_branches (get_insns ()); 3482 timevar_pop (TV_SHORTEN_BRANCH); 3483 3484 current_function_nothrow = nothrow_function_p (); 3485 if (current_function_nothrow) 3486 /* Now we know that this can't throw; set the flag for the benefit 3487 of other functions later in this translation unit. */ 3488 TREE_NOTHROW (current_function_decl) = 1; 3489 3490 /* Now turn the rtl into assembler code. */ 3491 3492 timevar_push (TV_FINAL); 3493 { 3494 rtx x; 3495 const char *fnname; 3496 3497 /* Get the function's name, as described by its RTL. This may be 3498 different from the DECL_NAME name used in the source file. */ 3499 3500 x = DECL_RTL (decl); 3501 if (GET_CODE (x) != MEM) 3502 abort (); 3503 x = XEXP (x, 0); 3504 if (GET_CODE (x) != SYMBOL_REF) 3505 abort (); 3506 fnname = XSTR (x, 0); 3507 3508 assemble_start_function (decl, fnname); 3509 final_start_function (insns, asm_out_file, optimize); 3510 final (insns, asm_out_file, optimize, 0); 3511 final_end_function (); 3512 3513#ifdef IA64_UNWIND_INFO 3514 /* ??? The IA-64 ".handlerdata" directive must be issued before 3515 the ".endp" directive that closes the procedure descriptor. */ 3516 output_function_exception_table (); 3517#endif 3518 3519 assemble_end_function (decl, fnname); 3520 3521#ifndef IA64_UNWIND_INFO 3522 /* Otherwise, it feels unclean to switch sections in the middle. */ 3523 output_function_exception_table (); 3524#endif 3525 3526 if (! quiet_flag) 3527 fflush (asm_out_file); 3528 3529 /* Release all memory allocated by flow. */ 3530 free_basic_block_vars (0); 3531 3532 /* Release all memory held by regsets now. */ 3533 regset_release_memory (); 3534 } 3535 timevar_pop (TV_FINAL); 3536 3537 ggc_collect (); 3538 3539 /* Write DBX symbols if requested. */ 3540 3541 /* Note that for those inline functions where we don't initially 3542 know for certain that we will be generating an out-of-line copy, 3543 the first invocation of this routine (rest_of_compilation) will 3544 skip over this code by doing a `goto exit_rest_of_compilation;'. 3545 Later on, finish_compilation will call rest_of_compilation again 3546 for those inline functions that need to have out-of-line copies 3547 generated. During that call, we *will* be routed past here. */ 3548 3549 timevar_push (TV_SYMOUT); 3550 (*debug_hooks->function_decl) (decl); 3551 timevar_pop (TV_SYMOUT); 3552 3553 exit_rest_of_compilation: 3554 3555 /* In case the function was not output, 3556 don't leave any temporary anonymous types 3557 queued up for sdb output. */ 3558#ifdef SDB_DEBUGGING_INFO 3559 if (write_symbols == SDB_DEBUG) 3560 sdbout_types (NULL_TREE); 3561#endif 3562 3563 reload_completed = 0; 3564 flow2_completed = 0; 3565 no_new_pseudos = 0; 3566 3567 timevar_push (TV_FINAL); 3568 3569 /* Clear out the insn_length contents now that they are no 3570 longer valid. */ 3571 init_insn_lengths (); 3572 3573 /* Clear out the real_constant_chain before some of the rtx's 3574 it runs through become garbage. */ 3575 clear_const_double_mem (); 3576 3577 /* Show no temporary slots allocated. */ 3578 init_temp_slots (); 3579 3580 free_basic_block_vars (0); 3581 free_bb_for_insn (); 3582 3583 timevar_pop (TV_FINAL); 3584 3585 /* Make sure volatile mem refs aren't considered valid operands for 3586 arithmetic insns. We must call this here if this is a nested inline 3587 function, since the above code leaves us in the init_recog state 3588 (from final.c), and the function context push/pop code does not 3589 save/restore volatile_ok. 3590 3591 ??? Maybe it isn't necessary for expand_start_function to call this 3592 anymore if we do it here? */ 3593 3594 init_recog_no_volatile (); 3595 3596 /* We're done with this function. Free up memory if we can. */ 3597 free_after_parsing (cfun); 3598 if (! DECL_DEFER_OUTPUT (decl)) 3599 { 3600 free_after_compilation (cfun); 3601 3602 /* Clear integrate.c's pointer to the cfun structure we just 3603 destroyed. */ 3604 DECL_SAVED_INSNS (decl) = 0; 3605 } 3606 cfun = 0; 3607 3608 ggc_collect (); 3609 3610 timevar_pop (TV_REST_OF_COMPILATION); 3611} 3612 3613static void 3614display_help () 3615{ 3616 int undoc; 3617 unsigned long i; 3618 const char *lang; 3619 3620 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n")); 3621 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n")); 3622 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n")); 3623 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n")); 3624 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n")); 3625 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")); 3626 3627 for (i = ARRAY_SIZE (f_options); i--;) 3628 { 3629 const char *description = f_options[i].description; 3630 3631 if (description != NULL && * description != 0) 3632 printf (" -f%-21s %s\n", 3633 f_options[i].string, _(description)); 3634 } 3635 3636 printf (_(" -O[number] Set optimization level to [number]\n")); 3637 printf (_(" -Os Optimize for space rather than speed\n")); 3638 for (i = LAST_PARAM; i--;) 3639 { 3640 const char *description = compiler_params[i].help; 3641 const int length = 21-strlen(compiler_params[i].option); 3642 3643 if (description != NULL && * description != 0) 3644 printf (" --param %s=<value>%.*s%s\n", 3645 compiler_params[i].option, 3646 length > 0 ? length : 1, " ", 3647 _(description)); 3648 } 3649 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n")); 3650 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n")); 3651 printf (_(" -w Suppress warnings\n")); 3652 printf (_(" -W Enable extra warnings\n")); 3653 3654 for (i = ARRAY_SIZE (W_options); i--;) 3655 { 3656 const char *description = W_options[i].description; 3657 3658 if (description != NULL && * description != 0) 3659 printf (" -W%-21s %s\n", 3660 W_options[i].string, _(description)); 3661 } 3662 3663 printf (_(" -Wunused Enable unused warnings\n")); 3664 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n")); 3665 printf (_(" -p Enable function profiling\n")); 3666 printf (_(" -o <file> Place output into <file> \n")); 3667 printf (_("\ 3668 -G <number> Put global and static data smaller than <number>\n\ 3669 bytes into a special section (on some targets)\n")); 3670 3671 for (i = ARRAY_SIZE (debug_args); i--;) 3672 { 3673 if (debug_args[i].description != NULL) 3674 printf (" -g%-21s %s\n", 3675 debug_args[i].arg, _(debug_args[i].description)); 3676 } 3677 3678 printf (_(" -aux-info <file> Emit declaration info into <file>\n")); 3679 printf (_(" -quiet Do not display functions compiled or elapsed time\n")); 3680 printf (_(" -version Display the compiler's version\n")); 3681 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n")); 3682 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n")); 3683#if defined INSN_SCHEDULING 3684 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n")); 3685#endif 3686 printf (_(" --help Display this information\n")); 3687 3688 undoc = 0; 3689 lang = "language"; 3690 3691 /* Display descriptions of language specific options. 3692 If there is no description, note that there is an undocumented option. 3693 If the description is empty, do not display anything. (This allows 3694 options to be deliberately undocumented, for whatever reason). 3695 If the option string is missing, then this is a marker, indicating 3696 that the description string is in fact the name of a language, whose 3697 language specific options are to follow. */ 3698 3699 if (ARRAY_SIZE (documented_lang_options) > 1) 3700 { 3701 printf (_("\nLanguage specific options:\n")); 3702 3703 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++) 3704 { 3705 const char *description = documented_lang_options[i].description; 3706 const char *option = documented_lang_options[i].option; 3707 3708 if (description == NULL) 3709 { 3710 undoc = 1; 3711 3712 if (extra_warnings) 3713 printf (_(" %-23.23s [undocumented]\n"), option); 3714 } 3715 else if (*description == 0) 3716 continue; 3717 else if (option == NULL) 3718 { 3719 if (undoc) 3720 printf 3721 (_("\nThere are undocumented %s specific options as well.\n"), 3722 lang); 3723 undoc = 0; 3724 3725 printf (_("\n Options for %s:\n"), description); 3726 3727 lang = description; 3728 } 3729 else 3730 printf (" %-23.23s %s\n", option, _(description)); 3731 } 3732 } 3733 3734 if (undoc) 3735 printf (_("\nThere are undocumented %s specific options as well.\n"), 3736 lang); 3737 3738 display_target_options (); 3739} 3740 3741static void 3742display_target_options () 3743{ 3744 int undoc, i; 3745 static bool displayed = false; 3746 3747 /* Avoid double printing for --help --target-help. */ 3748 if (displayed) 3749 return; 3750 displayed = true; 3751 3752 if (ARRAY_SIZE (target_switches) > 1 3753#ifdef TARGET_OPTIONS 3754 || ARRAY_SIZE (target_options) > 1 3755#endif 3756 ) 3757 { 3758 int doc = 0; 3759 3760 undoc = 0; 3761 3762 printf (_("\nTarget specific options:\n")); 3763 3764 for (i = ARRAY_SIZE (target_switches); i--;) 3765 { 3766 const char *option = target_switches[i].name; 3767 const char *description = target_switches[i].description; 3768 3769 if (option == NULL || *option == 0) 3770 continue; 3771 else if (description == NULL) 3772 { 3773 undoc = 1; 3774 3775 if (extra_warnings) 3776 printf (_(" -m%-23.23s [undocumented]\n"), option); 3777 } 3778 else if (* description != 0) 3779 doc += printf (" -m%-23.23s %s\n", option, _(description)); 3780 } 3781 3782#ifdef TARGET_OPTIONS 3783 for (i = ARRAY_SIZE (target_options); i--;) 3784 { 3785 const char *option = target_options[i].prefix; 3786 const char *description = target_options[i].description; 3787 3788 if (option == NULL || *option == 0) 3789 continue; 3790 else if (description == NULL) 3791 { 3792 undoc = 1; 3793 3794 if (extra_warnings) 3795 printf (_(" -m%-23.23s [undocumented]\n"), option); 3796 } 3797 else if (* description != 0) 3798 doc += printf (" -m%-23.23s %s\n", option, _(description)); 3799 } 3800#endif 3801 if (undoc) 3802 { 3803 if (doc) 3804 printf (_("\nThere are undocumented target specific options as well.\n")); 3805 else 3806 printf (_(" They exist, but they are not documented.\n")); 3807 } 3808 } 3809} 3810 3811/* Parse a -d... command line switch. */ 3812 3813static void 3814decode_d_option (arg) 3815 const char *arg; 3816{ 3817 int i, c, matched; 3818 3819 while (*arg) 3820 switch (c = *arg++) 3821 { 3822 case 'a': 3823 for (i = 0; i < (int) DFI_MAX; ++i) 3824 dump_file[i].enabled = 1; 3825 break; 3826 case 'A': 3827 flag_debug_asm = 1; 3828 break; 3829 case 'p': 3830 flag_print_asm_name = 1; 3831 break; 3832 case 'P': 3833 flag_dump_rtl_in_asm = 1; 3834 flag_print_asm_name = 1; 3835 break; 3836 case 'v': 3837 graph_dump_format = vcg; 3838 break; 3839 case 'x': 3840 rtl_dump_and_exit = 1; 3841 break; 3842 case 'y': 3843 (*lang_hooks.set_yydebug) (1); 3844 break; 3845 case 'D': /* These are handled by the preprocessor. */ 3846 case 'I': 3847 break; 3848 3849 default: 3850 matched = 0; 3851 for (i = 0; i < (int) DFI_MAX; ++i) 3852 if (c == dump_file[i].debug_switch) 3853 { 3854 dump_file[i].enabled = 1; 3855 matched = 1; 3856 } 3857 3858 if (! matched) 3859 warning ("unrecognized gcc debugging option: %c", c); 3860 break; 3861 } 3862} 3863 3864/* Parse a -f... command line switch. ARG is the value after the -f. 3865 It is safe to access 'ARG - 2' to generate the full switch name. 3866 Return the number of strings consumed. */ 3867 3868static int 3869decode_f_option (arg) 3870 const char *arg; 3871{ 3872 int j; 3873 const char *option_value = NULL; 3874 3875 /* Search for the option in the table of binary f options. */ 3876 for (j = ARRAY_SIZE (f_options); j--;) 3877 { 3878 if (!strcmp (arg, f_options[j].string)) 3879 { 3880 *f_options[j].variable = f_options[j].on_value; 3881 return 1; 3882 } 3883 3884 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-' 3885 && ! strcmp (arg + 3, f_options[j].string)) 3886 { 3887 *f_options[j].variable = ! f_options[j].on_value; 3888 return 1; 3889 } 3890 } 3891 3892 if (!strcmp (arg, "fast-math")) 3893 set_fast_math_flags (); 3894 else if (!strcmp (arg, "no-fast-math")) 3895 set_no_fast_math_flags (); 3896 else if ((option_value = skip_leading_substring (arg, "inline-limit-")) 3897 || (option_value = skip_leading_substring (arg, "inline-limit="))) 3898 { 3899 int val = 3900 read_integral_parameter (option_value, arg - 2, 3901 MAX_INLINE_INSNS); 3902 set_param_value ("max-inline-insns", val); 3903 } 3904#ifdef INSN_SCHEDULING 3905 else if ((option_value = skip_leading_substring (arg, "sched-verbose="))) 3906 fix_sched_param ("verbose", option_value); 3907#endif 3908 else if ((option_value = skip_leading_substring (arg, "fixed-"))) 3909 fix_register (option_value, 1, 1); 3910 else if ((option_value = skip_leading_substring (arg, "call-used-"))) 3911 fix_register (option_value, 0, 1); 3912 else if ((option_value = skip_leading_substring (arg, "call-saved-"))) 3913 fix_register (option_value, 0, 0); 3914 else if ((option_value = skip_leading_substring (arg, "align-loops="))) 3915 align_loops = read_integral_parameter (option_value, arg - 2, align_loops); 3916 else if ((option_value = skip_leading_substring (arg, "align-functions="))) 3917 align_functions 3918 = read_integral_parameter (option_value, arg - 2, align_functions); 3919 else if ((option_value = skip_leading_substring (arg, "align-jumps="))) 3920 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps); 3921 else if ((option_value = skip_leading_substring (arg, "align-labels="))) 3922 align_labels 3923 = read_integral_parameter (option_value, arg - 2, align_labels); 3924 else if ((option_value 3925 = skip_leading_substring (arg, "stack-limit-register="))) 3926 { 3927 int reg = decode_reg_name (option_value); 3928 if (reg < 0) 3929 error ("unrecognized register name `%s'", option_value); 3930 else 3931 stack_limit_rtx = gen_rtx_REG (Pmode, reg); 3932 } 3933 else if ((option_value 3934 = skip_leading_substring (arg, "stack-limit-symbol="))) 3935 { 3936 const char *nm; 3937 nm = ggc_strdup (option_value); 3938 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm); 3939 } 3940 else if ((option_value 3941 = skip_leading_substring (arg, "message-length="))) 3942 output_set_maximum_length 3943 (&global_dc->buffer, read_integral_parameter 3944 (option_value, arg - 2, diagnostic_line_cutoff (global_dc))); 3945 else if ((option_value 3946 = skip_leading_substring (arg, "diagnostics-show-location="))) 3947 { 3948 if (!strcmp (option_value, "once")) 3949 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE; 3950 else if (!strcmp (option_value, "every-line")) 3951 diagnostic_prefixing_rule (global_dc) 3952 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE; 3953 else 3954 error ("unrecognized option `%s'", arg - 2); 3955 } 3956 else if (!strcmp (arg, "no-stack-limit")) 3957 stack_limit_rtx = NULL_RTX; 3958 else if (!strcmp (arg, "preprocessed")) 3959 /* Recognise this switch but do nothing. This prevents warnings 3960 about an unrecognized switch if cpplib has not been linked in. */ 3961 ; 3962 else 3963 return 0; 3964 3965 return 1; 3966} 3967 3968/* Parse a -W... command line switch. ARG is the value after the -W. 3969 It is safe to access 'ARG - 2' to generate the full switch name. 3970 Return the number of strings consumed. */ 3971 3972static int 3973decode_W_option (arg) 3974 const char *arg; 3975{ 3976 const char *option_value = NULL; 3977 int j; 3978 3979 /* Search for the option in the table of binary W options. */ 3980 3981 for (j = ARRAY_SIZE (W_options); j--;) 3982 { 3983 if (!strcmp (arg, W_options[j].string)) 3984 { 3985 *W_options[j].variable = W_options[j].on_value; 3986 return 1; 3987 } 3988 3989 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-' 3990 && ! strcmp (arg + 3, W_options[j].string)) 3991 { 3992 *W_options[j].variable = ! W_options[j].on_value; 3993 return 1; 3994 } 3995 } 3996 3997 if ((option_value = skip_leading_substring (arg, "id-clash-"))) 3998 warning ("-Wid-clash-LEN is no longer supported"); 3999 else if ((option_value = skip_leading_substring (arg, "larger-than-"))) 4000 { 4001 larger_than_size = read_integral_parameter (option_value, arg - 2, -1); 4002 4003 warn_larger_than = larger_than_size != -1; 4004 } 4005 else if (!strcmp (arg, "unused")) 4006 { 4007 set_Wunused (1); 4008 } 4009 else if (!strcmp (arg, "no-unused")) 4010 { 4011 set_Wunused (0); 4012 } 4013 else 4014 return 0; 4015 4016 return 1; 4017} 4018 4019/* Parse a -g... command line switch. ARG is the value after the -g. 4020 It is safe to access 'ARG - 2' to generate the full switch name. 4021 Return the number of strings consumed. */ 4022 4023static int 4024decode_g_option (arg) 4025 const char *arg; 4026{ 4027 static unsigned level=0; 4028 /* A lot of code assumes write_symbols == NO_DEBUG if the 4029 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track 4030 of what debugging type has been selected). This records the 4031 selected type. It is an error to specify more than one 4032 debugging type. */ 4033 static enum debug_info_type selected_debug_type = NO_DEBUG; 4034 /* Non-zero if debugging format has been explicitly set. 4035 -g and -ggdb don't explicitly set the debugging format so 4036 -gdwarf -g3 is equivalent to -gdwarf3. */ 4037 static int type_explicitly_set_p = 0; 4038 /* Indexed by enum debug_info_type. */ 4039 static const char *const debug_type_names[] = 4040 { 4041 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms" 4042 }; 4043 4044 /* The maximum admissible debug level value. */ 4045 static const unsigned max_debug_level = 3; 4046 4047 /* Look up ARG in the table. */ 4048 for (da = debug_args; da->arg; da++) 4049 { 4050 const int da_len = strlen (da->arg); 4051 4052 if (da_len == 0 || ! strncmp (arg, da->arg, da_len)) 4053 { 4054 enum debug_info_type type = da->debug_type; 4055 const char *p = arg + da_len; 4056 4057 if (*p && ! ISDIGIT (*p)) 4058 continue; 4059 4060 /* A debug flag without a level defaults to level 2. 4061 Note we do not want to call read_integral_parameter 4062 for that case since it will call atoi which 4063 will return zero. 4064 4065 ??? We may want to generalize the interface to 4066 read_integral_parameter to better handle this case 4067 if this case shows up often. */ 4068 if (*p) 4069 level = read_integral_parameter (p, 0, max_debug_level + 1); 4070 else 4071 level = (level == 0) ? 2 : level; 4072 4073 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len)) 4074 { 4075 error ("use -gdwarf -g%d for DWARF v1, level %d", 4076 level, level); 4077 if (level == 2) 4078 error ("use -gdwarf-2 for DWARF v2"); 4079 } 4080 4081 if (level > max_debug_level) 4082 { 4083 warning ("\ 4084ignoring option `%s' due to invalid debug level specification", 4085 arg - 2); 4086 level = debug_info_level; 4087 } 4088 4089 if (type == NO_DEBUG) 4090 { 4091 type = PREFERRED_DEBUGGING_TYPE; 4092 4093 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0) 4094 { 4095#ifdef DWARF2_DEBUGGING_INFO 4096 type = DWARF2_DEBUG; 4097#else 4098#ifdef DBX_DEBUGGING_INFO 4099 type = DBX_DEBUG; 4100#endif 4101#endif 4102 } 4103 } 4104 4105 if (type == NO_DEBUG) 4106 warning ("`%s': unknown or unsupported -g option", arg - 2); 4107 4108 /* Does it conflict with an already selected type? */ 4109 if (type_explicitly_set_p 4110 /* -g/-ggdb don't conflict with anything. */ 4111 && da->debug_type != NO_DEBUG 4112 && type != selected_debug_type) 4113 warning ("`%s' ignored, conflicts with `-g%s'", 4114 arg - 2, debug_type_names[(int) selected_debug_type]); 4115 else 4116 { 4117 /* If the format has already been set, -g/-ggdb 4118 only change the debug level. */ 4119 if (type_explicitly_set_p && da->debug_type == NO_DEBUG) 4120 /* Don't change debugging type. */ 4121 ; 4122 else 4123 { 4124 selected_debug_type = type; 4125 type_explicitly_set_p = da->debug_type != NO_DEBUG; 4126 } 4127 4128 write_symbols = (level == 0 4129 ? NO_DEBUG 4130 : selected_debug_type); 4131 use_gnu_debug_info_extensions = da->use_extensions_p; 4132 debug_info_level = (enum debug_info_level) level; 4133 } 4134 4135 break; 4136 } 4137 } 4138 4139 if (! da->arg) 4140 return 0; 4141 4142 return 1; 4143} 4144 4145/* Decode the first argument in the argv as a language-independent option. 4146 Return the number of strings consumed. */ 4147 4148static unsigned int 4149independent_decode_option (argc, argv) 4150 int argc; 4151 char **argv; 4152{ 4153 char *arg = argv[0]; 4154 4155 if (arg[0] != '-' || arg[1] == 0) 4156 { 4157 if (arg[0] == '+') 4158 return 0; 4159 4160 filename = arg; 4161 4162 return 1; 4163 } 4164 4165 arg++; 4166 4167 if (!strcmp (arg, "-help")) 4168 { 4169 display_help (); 4170 exit_after_options = 1; 4171 } 4172 4173 if (!strcmp (arg, "-target-help")) 4174 { 4175 display_target_options (); 4176 exit_after_options = 1; 4177 } 4178 4179 if (!strcmp (arg, "-version")) 4180 { 4181 print_version (stderr, ""); 4182 exit_after_options = 1; 4183 } 4184 4185 /* Handle '--param <name>=<value>'. */ 4186 if (strcmp (arg, "-param") == 0) 4187 { 4188 char *equal; 4189 4190 if (argc == 1) 4191 { 4192 error ("-param option missing argument"); 4193 return 1; 4194 } 4195 4196 /* Get the '<name>=<value>' parameter. */ 4197 arg = argv[1]; 4198 /* Look for the `='. */ 4199 equal = strchr (arg, '='); 4200 if (!equal) 4201 error ("invalid --param option: %s", arg); 4202 else 4203 { 4204 int val; 4205 4206 /* Zero out the `=' sign so that we get two separate strings. */ 4207 *equal = '\0'; 4208 /* Figure out what value is specified. */ 4209 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL); 4210 if (val != INVALID_PARAM_VAL) 4211 set_param_value (arg, val); 4212 else 4213 error ("invalid parameter value `%s'", equal + 1); 4214 } 4215 4216 return 2; 4217 } 4218 4219 if (*arg == 'Y') 4220 arg++; 4221 4222 switch (*arg) 4223 { 4224 default: 4225 return 0; 4226 4227 case 'O': 4228 /* Already been treated in main (). Do nothing. */ 4229 break; 4230 4231 case 'm': 4232 set_target_switch (arg + 1); 4233 break; 4234 4235 case 'f': 4236 return decode_f_option (arg + 1); 4237 4238 case 'g': 4239 return decode_g_option (arg + 1); 4240 4241 case 'd': 4242 if (!strcmp (arg, "dumpbase")) 4243 { 4244 if (argc == 1) 4245 return 0; 4246 4247 dump_base_name = argv[1]; 4248 return 2; 4249 } 4250 else 4251 decode_d_option (arg + 1); 4252 break; 4253 4254 case 'p': 4255 if (!strcmp (arg, "pedantic")) 4256 pedantic = 1; 4257 else if (!strcmp (arg, "pedantic-errors")) 4258 flag_pedantic_errors = pedantic = 1; 4259 else if (arg[1] == 0) 4260 profile_flag = 1; 4261 else 4262 return 0; 4263 break; 4264 4265 case 'q': 4266 if (!strcmp (arg, "quiet")) 4267 quiet_flag = 1; 4268 else 4269 return 0; 4270 break; 4271 4272 case 'v': 4273 if (!strcmp (arg, "version")) 4274 version_flag = 1; 4275 else 4276 return 0; 4277 break; 4278 4279 case 'w': 4280 if (arg[1] == 0) 4281 inhibit_warnings = 1; 4282 else 4283 return 0; 4284 break; 4285 4286 case 'W': 4287 if (arg[1] == 0) 4288 { 4289 extra_warnings = 1; 4290 /* We save the value of warn_uninitialized, since if they put 4291 -Wuninitialized on the command line, we need to generate a 4292 warning about not using it without also specifying -O. */ 4293 if (warn_uninitialized != 1) 4294 warn_uninitialized = 2; 4295 } 4296 else 4297 return decode_W_option (arg + 1); 4298 break; 4299 4300 case 'a': 4301 if (!strncmp (arg, "aux-info", 8)) 4302 { 4303 if (arg[8] == '\0') 4304 { 4305 if (argc == 1) 4306 return 0; 4307 4308 aux_info_file_name = argv[1]; 4309 flag_gen_aux_info = 1; 4310 return 2; 4311 } 4312 else if (arg[8] == '=') 4313 { 4314 aux_info_file_name = arg + 9; 4315 flag_gen_aux_info = 1; 4316 } 4317 else 4318 return 0; 4319 } 4320 else 4321 return 0; 4322 break; 4323 4324 case 'o': 4325 if (arg[1] == 0) 4326 { 4327 if (argc == 1) 4328 return 0; 4329 4330 asm_file_name = argv[1]; 4331 return 2; 4332 } 4333 return 0; 4334 4335 case 'G': 4336 { 4337 int g_switch_val; 4338 int return_val; 4339 4340 if (arg[1] == 0) 4341 { 4342 if (argc == 1) 4343 return 0; 4344 4345 g_switch_val = read_integral_parameter (argv[1], 0, -1); 4346 return_val = 2; 4347 } 4348 else 4349 { 4350 g_switch_val = read_integral_parameter (arg + 1, 0, -1); 4351 return_val = 1; 4352 } 4353 4354 if (g_switch_val == -1) 4355 return_val = 0; 4356 else 4357 { 4358 g_switch_set = TRUE; 4359 g_switch_value = g_switch_val; 4360 } 4361 4362 return return_val; 4363 } 4364 } 4365 4366 return 1; 4367} 4368 4369/* Decode -m switches. */ 4370/* Decode the switch -mNAME. */ 4371 4372static void 4373set_target_switch (name) 4374 const char *name; 4375{ 4376 size_t j; 4377 int valid_target_option = 0; 4378 4379 for (j = 0; j < ARRAY_SIZE (target_switches); j++) 4380 if (!strcmp (target_switches[j].name, name)) 4381 { 4382 if (target_switches[j].value < 0) 4383 target_flags &= ~-target_switches[j].value; 4384 else 4385 target_flags |= target_switches[j].value; 4386 valid_target_option = 1; 4387 } 4388 4389#ifdef TARGET_OPTIONS 4390 if (!valid_target_option) 4391 for (j = 0; j < ARRAY_SIZE (target_options); j++) 4392 { 4393 int len = strlen (target_options[j].prefix); 4394 if (!strncmp (target_options[j].prefix, name, len)) 4395 { 4396 *target_options[j].variable = name + len; 4397 valid_target_option = 1; 4398 } 4399 } 4400#endif 4401 4402 if (!valid_target_option) 4403 error ("invalid option `%s'", name); 4404} 4405 4406/* Print version information to FILE. 4407 Each line begins with INDENT (for the case where FILE is the 4408 assembler output file). */ 4409 4410static void 4411print_version (file, indent) 4412 FILE *file; 4413 const char *indent; 4414{ 4415#ifndef __VERSION__ 4416#define __VERSION__ "[?]" 4417#endif 4418 fnotice (file, 4419#ifdef __GNUC__ 4420 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n" 4421#else 4422 "%s%s%s version %s (%s) compiled by CC.\n" 4423#endif 4424 , indent, *indent != 0 ? " " : "", 4425 lang_hooks.name, version_string, TARGET_NAME, 4426 indent, __VERSION__); 4427} 4428 4429/* Print an option value and return the adjusted position in the line. 4430 ??? We don't handle error returns from fprintf (disk full); presumably 4431 other code will catch a disk full though. */ 4432 4433static int 4434print_single_switch (file, pos, max, indent, sep, term, type, name) 4435 FILE *file; 4436 int pos, max; 4437 const char *indent, *sep, *term, *type, *name; 4438{ 4439 /* The ultrix fprintf returns 0 on success, so compute the result we want 4440 here since we need it for the following test. */ 4441 int len = strlen (sep) + strlen (type) + strlen (name); 4442 4443 if (pos != 0 4444 && pos + len > max) 4445 { 4446 fprintf (file, "%s", term); 4447 pos = 0; 4448 } 4449 if (pos == 0) 4450 { 4451 fprintf (file, "%s", indent); 4452 pos = strlen (indent); 4453 } 4454 fprintf (file, "%s%s%s", sep, type, name); 4455 pos += len; 4456 return pos; 4457} 4458 4459/* Print active target switches to FILE. 4460 POS is the current cursor position and MAX is the size of a "line". 4461 Each line begins with INDENT and ends with TERM. 4462 Each switch is separated from the next by SEP. */ 4463 4464static void 4465print_switch_values (file, pos, max, indent, sep, term) 4466 FILE *file; 4467 int pos, max; 4468 const char *indent, *sep, *term; 4469{ 4470 size_t j; 4471 char **p; 4472 4473 /* Print the options as passed. */ 4474 4475 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term, 4476 _("options passed: "), ""); 4477 4478 for (p = &save_argv[1]; *p != NULL; p++) 4479 if (**p == '-') 4480 { 4481 /* Ignore these. */ 4482 if (strcmp (*p, "-o") == 0) 4483 { 4484 if (p[1] != NULL) 4485 p++; 4486 continue; 4487 } 4488 if (strcmp (*p, "-quiet") == 0) 4489 continue; 4490 if (strcmp (*p, "-version") == 0) 4491 continue; 4492 if ((*p)[1] == 'd') 4493 continue; 4494 4495 pos = print_single_switch (file, pos, max, indent, sep, term, *p, ""); 4496 } 4497 if (pos > 0) 4498 fprintf (file, "%s", term); 4499 4500 /* Print the -f and -m options that have been enabled. 4501 We don't handle language specific options but printing argv 4502 should suffice. */ 4503 4504 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term, 4505 _("options enabled: "), ""); 4506 4507 for (j = 0; j < ARRAY_SIZE (f_options); j++) 4508 if (*f_options[j].variable == f_options[j].on_value) 4509 pos = print_single_switch (file, pos, max, indent, sep, term, 4510 "-f", f_options[j].string); 4511 4512 /* Print target specific options. */ 4513 4514 for (j = 0; j < ARRAY_SIZE (target_switches); j++) 4515 if (target_switches[j].name[0] != '\0' 4516 && target_switches[j].value > 0 4517 && ((target_switches[j].value & target_flags) 4518 == target_switches[j].value)) 4519 { 4520 pos = print_single_switch (file, pos, max, indent, sep, term, 4521 "-m", target_switches[j].name); 4522 } 4523 4524#ifdef TARGET_OPTIONS 4525 for (j = 0; j < ARRAY_SIZE (target_options); j++) 4526 if (*target_options[j].variable != NULL) 4527 { 4528 char prefix[256]; 4529 sprintf (prefix, "-m%s", target_options[j].prefix); 4530 pos = print_single_switch (file, pos, max, indent, sep, term, 4531 prefix, *target_options[j].variable); 4532 } 4533#endif 4534 4535 fprintf (file, "%s", term); 4536} 4537 4538/* Open assembly code output file. Do this even if -fsyntax-only is 4539 on, because then the driver will have provided the name of a 4540 temporary file or bit bucket for us. NAME is the file specified on 4541 the command line, possibly NULL. */ 4542static void 4543init_asm_output (name) 4544 const char *name; 4545{ 4546 if (name == NULL && asm_file_name == 0) 4547 asm_out_file = stdout; 4548 else 4549 { 4550 if (asm_file_name == 0) 4551 { 4552 int len = strlen (dump_base_name); 4553 char *dumpname = (char *) xmalloc (len + 6); 4554 memcpy (dumpname, dump_base_name, len + 1); 4555 strip_off_ending (dumpname, len); 4556 strcat (dumpname, ".s"); 4557 asm_file_name = dumpname; 4558 } 4559 if (!strcmp (asm_file_name, "-")) 4560 asm_out_file = stdout; 4561 else 4562 asm_out_file = fopen (asm_file_name, "w"); 4563 if (asm_out_file == 0) 4564 fatal_io_error ("can't open %s for writing", asm_file_name); 4565 } 4566 4567#ifdef IO_BUFFER_SIZE 4568 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE), 4569 _IOFBF, IO_BUFFER_SIZE); 4570#endif 4571 4572 if (!flag_syntax_only) 4573 { 4574#ifdef ASM_FILE_START 4575 ASM_FILE_START (asm_out_file); 4576#endif 4577 4578#ifdef ASM_COMMENT_START 4579 if (flag_verbose_asm) 4580 { 4581 /* Print the list of options in effect. */ 4582 print_version (asm_out_file, ASM_COMMENT_START); 4583 print_switch_values (asm_out_file, 0, MAX_LINE, 4584 ASM_COMMENT_START, " ", "\n"); 4585 /* Add a blank line here so it appears in assembler output but not 4586 screen output. */ 4587 fprintf (asm_out_file, "\n"); 4588 } 4589#endif 4590 } 4591} 4592 4593/* Initialization of the front end environment, before command line 4594 options are parsed. Signal handlers, internationalization etc. 4595 ARGV0 is main's argv[0]. */ 4596static void 4597general_init (argv0) 4598 char *argv0; 4599{ 4600 char *p; 4601 4602 p = argv0 + strlen (argv0); 4603 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1])) 4604 --p; 4605 progname = p; 4606 4607 xmalloc_set_program_name (progname); 4608 4609 gcc_init_libintl (); 4610 4611 /* Install handler for SIGFPE, which may be received while we do 4612 compile-time floating point arithmetic. */ 4613 signal (SIGFPE, float_signal); 4614 4615 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */ 4616#ifdef SIGSEGV 4617 signal (SIGSEGV, crash_signal); 4618#endif 4619#ifdef SIGILL 4620 signal (SIGILL, crash_signal); 4621#endif 4622#ifdef SIGBUS 4623 signal (SIGBUS, crash_signal); 4624#endif 4625#ifdef SIGABRT 4626 signal (SIGABRT, crash_signal); 4627#endif 4628#if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT) 4629 signal (SIGIOT, crash_signal); 4630#endif 4631 4632 /* Initialize the diagnostics reporting machinery, so option parsing 4633 can give warnings and errors. */ 4634 diagnostic_initialize (global_dc); 4635} 4636 4637/* Parse command line options and set default flag values, called 4638 after language-independent option-independent initialization. Do 4639 minimal options processing. Outputting diagnostics is OK, but GC 4640 and identifier hashtables etc. are not initialized yet. */ 4641static void 4642parse_options_and_default_flags (argc, argv) 4643 int argc; 4644 char **argv; 4645{ 4646 int i; 4647 4648 /* Save in case md file wants to emit args as a comment. */ 4649 save_argc = argc; 4650 save_argv = argv; 4651 4652 /* Initialize register usage now so switches may override. */ 4653 init_reg_sets (); 4654 4655 /* Register the language-independent parameters. */ 4656 add_params (lang_independent_params, LAST_PARAM); 4657 4658 /* Perform language-specific options initialization. */ 4659 (*lang_hooks.init_options) (); 4660 4661 /* Scan to see what optimization level has been specified. That will 4662 determine the default value of many flags. */ 4663 for (i = 1; i < argc; i++) 4664 { 4665 if (!strcmp (argv[i], "-O")) 4666 { 4667 optimize = 1; 4668 optimize_size = 0; 4669 } 4670 else if (argv[i][0] == '-' && argv[i][1] == 'O') 4671 { 4672 /* Handle -Os, -O2, -O3, -O69, ... */ 4673 char *p = &argv[i][2]; 4674 4675 if ((p[0] == 's') && (p[1] == 0)) 4676 { 4677 optimize_size = 1; 4678 4679 /* Optimizing for size forces optimize to be 2. */ 4680 optimize = 2; 4681 } 4682 else 4683 { 4684 const int optimize_val = read_integral_parameter (p, p - 2, -1); 4685 if (optimize_val != -1) 4686 { 4687 optimize = optimize_val; 4688 4689#ifdef FORCE_OPTIMIZATION_DOWNGRADE 4690#warning FORCE_OPTIMIZATION_DOWNGRADE 4691 if (optimize > FORCE_OPTIMIZATION_DOWNGRADE) 4692 { 4693 optimize = FORCE_OPTIMIZATION_DOWNGRADE; 4694 warning ("\n***\n***\t-O%d converted to \"-O%d\" due to optimizer bugs on this platform\n***", 4695 optimize_val, 4696 FORCE_OPTIMIZATION_DOWNGRADE); 4697 4698 } 4699#endif /*FORCE_OPTIMIZATION_DOWNGRADE*/ 4700 4701#if defined(TRY_WITHOUT_THIS__alpha__) 4702 if (optimize > 1) 4703 { 4704 warning ("\n***\n***\tThe -O%d flag TRIGGERS KNOWN OPTIMIZER BUGS ON THIS PLATFORM\n***", 4705 optimize_val); 4706 } 4707#endif /*__alpha__*/ 4708 4709 optimize_size = 0; 4710 } 4711 } 4712 } 4713 } 4714 4715 if (!optimize) 4716 { 4717 flag_merge_constants = 0; 4718 } 4719 4720 if (optimize >= 1) 4721 { 4722 flag_defer_pop = 1; 4723 flag_thread_jumps = 1; 4724#ifdef DELAY_SLOTS 4725 flag_delayed_branch = 1; 4726#endif 4727#ifdef CAN_DEBUG_WITHOUT_FP 4728 flag_omit_frame_pointer = 1; 4729#endif 4730 flag_guess_branch_prob = 1; 4731 flag_cprop_registers = 1; 4732 } 4733 4734 if (optimize >= 2) 4735 { 4736 flag_optimize_sibling_calls = 1; 4737 flag_cse_follow_jumps = 1; 4738 flag_cse_skip_blocks = 1; 4739 flag_gcse = 1; 4740 flag_expensive_optimizations = 1; 4741 flag_strength_reduce = 1; 4742 flag_rerun_cse_after_loop = 1; 4743 flag_rerun_loop_opt = 1; 4744 flag_caller_saves = 1; 4745 flag_force_mem = 1; 4746 flag_peephole2 = 1; 4747#ifdef INSN_SCHEDULING 4748 flag_schedule_insns = 1; 4749 flag_schedule_insns_after_reload = 1; 4750#endif 4751 flag_regmove = 1; 4752 flag_strict_aliasing = 1; 4753 flag_delete_null_pointer_checks = 1; 4754 flag_reorder_blocks = 1; 4755 } 4756 4757 if (optimize >= 3) 4758 { 4759 flag_inline_functions = 1; 4760 flag_rename_registers = 1; 4761 } 4762 4763 if (optimize_size) 4764 { 4765 align_loops = 1; 4766 align_jumps = 1; 4767 align_labels = 1; 4768 align_functions = 1; 4769 } 4770 4771 /* Initialize whether `char' is signed. */ 4772 flag_signed_char = DEFAULT_SIGNED_CHAR; 4773#ifdef DEFAULT_SHORT_ENUMS 4774 /* Initialize how much space enums occupy, by default. */ 4775 flag_short_enums = DEFAULT_SHORT_ENUMS; 4776#endif 4777 4778 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can 4779 modify it. */ 4780 target_flags = 0; 4781 set_target_switch (""); 4782 4783 /* Unwind tables are always present in an ABI-conformant IA-64 4784 object file, so the default should be ON. */ 4785#ifdef IA64_UNWIND_INFO 4786 flag_unwind_tables = IA64_UNWIND_INFO; 4787#endif 4788 4789#ifdef OPTIMIZATION_OPTIONS 4790 /* Allow default optimizations to be specified on a per-machine basis. */ 4791 OPTIMIZATION_OPTIONS (optimize, optimize_size); 4792#endif 4793 4794 /* Perform normal command line switch decoding. */ 4795 for (i = 1; i < argc;) 4796 { 4797 int lang_processed; 4798 int indep_processed; 4799 4800 /* Give the language a chance to decode the option for itself. */ 4801 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i); 4802 4803 if (lang_processed >= 0) 4804 /* Now see if the option also has a language independent meaning. 4805 Some options are both language specific and language independent, 4806 eg --help. */ 4807 indep_processed = independent_decode_option (argc - i, argv + i); 4808 else 4809 { 4810 lang_processed = -lang_processed; 4811 indep_processed = 0; 4812 } 4813 4814 if (lang_processed || indep_processed) 4815 i += MAX (lang_processed, indep_processed); 4816 else 4817 { 4818 const char *option = NULL; 4819 const char *lang = NULL; 4820 unsigned int j; 4821 4822 /* It is possible that the command line switch is not valid for the 4823 current language, but it is valid for another language. In order 4824 to be compatible with previous versions of the compiler (which 4825 did not issue an error message in this case) we check for this 4826 possibility here. If we do find a match, then if extra_warnings 4827 is set we generate a warning message, otherwise we will just 4828 ignore the option. */ 4829 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++) 4830 { 4831 option = documented_lang_options[j].option; 4832 4833 if (option == NULL) 4834 lang = documented_lang_options[j].description; 4835 else if (! strncmp (argv[i], option, strlen (option))) 4836 break; 4837 } 4838 4839 if (j != ARRAY_SIZE (documented_lang_options)) 4840 { 4841 if (extra_warnings) 4842 { 4843 warning ("ignoring command line option '%s'", argv[i]); 4844 if (lang) 4845 warning 4846 ("(it is valid for %s but not the selected language)", 4847 lang); 4848 } 4849 } 4850 else if (argv[i][0] == '-' && argv[i][1] == 'g') 4851 warning ("`%s': unknown or unsupported -g option", &argv[i][2]); 4852 else 4853 error ("unrecognized option `%s'", argv[i]); 4854 4855 i++; 4856 } 4857 } 4858 4859 if (flag_no_inline == 2) 4860 flag_no_inline = 0; 4861 else 4862 flag_really_no_inline = flag_no_inline; 4863 4864 /* Set flag_no_inline before the post_options () hook. The C front 4865 ends use it to determine tree inlining defaults. FIXME: such 4866 code should be lang-independent when all front ends use tree 4867 inlining, in which case it, and this condition, should be moved 4868 to the top of process_options() instead. */ 4869 if (optimize == 0) 4870 { 4871 /* Inlining does not work if not optimizing, 4872 so force it not to be done. */ 4873 flag_no_inline = 1; 4874 warn_inline = 0; 4875 4876 /* The c_decode_option function and decode_option hook set 4877 this to `2' if -Wall is used, so we can avoid giving out 4878 lots of errors for people who don't realize what -Wall does. */ 4879 if (warn_uninitialized == 1) 4880 warning ("-Wuninitialized is not supported without -O"); 4881 } 4882 4883 if (flag_really_no_inline == 2) 4884 flag_really_no_inline = flag_no_inline; 4885 4886 /* All command line options have been parsed; allow the front end to 4887 perform consistency checks, etc. */ 4888 (*lang_hooks.post_options) (); 4889} 4890 4891/* Process the options that have been parsed. */ 4892static void 4893process_options () 4894{ 4895#ifdef OVERRIDE_OPTIONS 4896 /* Some machines may reject certain combinations of options. */ 4897 OVERRIDE_OPTIONS; 4898#endif 4899 4900 /* Set up the align_*_log variables, defaulting them to 1 if they 4901 were still unset. */ 4902 if (align_loops <= 0) align_loops = 1; 4903 if (align_loops_max_skip > align_loops || !align_loops) 4904 align_loops_max_skip = align_loops - 1; 4905 align_loops_log = floor_log2 (align_loops * 2 - 1); 4906 if (align_jumps <= 0) align_jumps = 1; 4907 if (align_jumps_max_skip > align_jumps || !align_jumps) 4908 align_jumps_max_skip = align_jumps - 1; 4909 align_jumps_log = floor_log2 (align_jumps * 2 - 1); 4910 if (align_labels <= 0) align_labels = 1; 4911 align_labels_log = floor_log2 (align_labels * 2 - 1); 4912 if (align_labels_max_skip > align_labels || !align_labels) 4913 align_labels_max_skip = align_labels - 1; 4914 if (align_functions <= 0) align_functions = 1; 4915 align_functions_log = floor_log2 (align_functions * 2 - 1); 4916 4917 /* Unrolling all loops implies that standard loop unrolling must also 4918 be done. */ 4919 if (flag_unroll_all_loops) 4920 flag_unroll_loops = 1; 4921 /* Loop unrolling requires that strength_reduction be on also. Silently 4922 turn on strength reduction here if it isn't already on. Also, the loop 4923 unrolling code assumes that cse will be run after loop, so that must 4924 be turned on also. */ 4925 if (flag_unroll_loops) 4926 { 4927 flag_strength_reduce = 1; 4928 flag_rerun_cse_after_loop = 1; 4929 } 4930 4931 if (flag_non_call_exceptions) 4932 flag_asynchronous_unwind_tables = 1; 4933 if (flag_asynchronous_unwind_tables) 4934 flag_unwind_tables = 1; 4935 4936 /* Warn about options that are not supported on this machine. */ 4937#ifndef INSN_SCHEDULING 4938 if (flag_schedule_insns || flag_schedule_insns_after_reload) 4939 warning ("instruction scheduling not supported on this target machine"); 4940#endif 4941#ifndef DELAY_SLOTS 4942 if (flag_delayed_branch) 4943 warning ("this target machine does not have delayed branches"); 4944#endif 4945 4946 /* Some operating systems do not allow profiling without a frame 4947 pointer. */ 4948 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER 4949 && profile_flag 4950 && flag_omit_frame_pointer) 4951 { 4952 error ("profiling does not work without a frame pointer"); 4953 flag_omit_frame_pointer = 0; 4954 } 4955 4956 user_label_prefix = USER_LABEL_PREFIX; 4957 if (flag_leading_underscore != -1) 4958 { 4959 /* If the default prefix is more complicated than "" or "_", 4960 issue a warning and ignore this option. */ 4961 if (user_label_prefix[0] == 0 || 4962 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0)) 4963 { 4964 user_label_prefix = flag_leading_underscore ? "_" : ""; 4965 } 4966 else 4967 warning ("-f%sleading-underscore not supported on this target machine", 4968 flag_leading_underscore ? "" : "no-"); 4969 } 4970 4971 /* If we are in verbose mode, write out the version and maybe all the 4972 option flags in use. */ 4973 if (version_flag) 4974 { 4975 print_version (stderr, ""); 4976 if (! quiet_flag) 4977 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n"); 4978 } 4979 4980 if (! quiet_flag) 4981 time_report = 1; 4982 4983 if (flag_syntax_only) 4984 { 4985 write_symbols = NO_DEBUG; 4986 profile_flag = 0; 4987 } 4988 4989 /* Now we know write_symbols, set up the debug hooks based on it. 4990 By default we do nothing for debug output. */ 4991#if defined(DBX_DEBUGGING_INFO) 4992 if (write_symbols == DBX_DEBUG) 4993 debug_hooks = &dbx_debug_hooks; 4994#endif 4995#if defined(XCOFF_DEBUGGING_INFO) 4996 if (write_symbols == XCOFF_DEBUG) 4997 debug_hooks = &xcoff_debug_hooks; 4998#endif 4999#ifdef SDB_DEBUGGING_INFO 5000 if (write_symbols == SDB_DEBUG) 5001 debug_hooks = &sdb_debug_hooks; 5002#endif 5003#ifdef DWARF_DEBUGGING_INFO 5004 if (write_symbols == DWARF_DEBUG) 5005 debug_hooks = &dwarf_debug_hooks; 5006#endif 5007#ifdef DWARF2_DEBUGGING_INFO 5008 if (write_symbols == DWARF2_DEBUG) 5009 debug_hooks = &dwarf2_debug_hooks; 5010#endif 5011#ifdef VMS_DEBUGGING_INFO 5012 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG) 5013 debug_hooks = &vmsdbg_debug_hooks; 5014#endif 5015 5016 /* If auxiliary info generation is desired, open the output file. 5017 This goes in the same directory as the source file--unlike 5018 all the other output files. */ 5019 if (flag_gen_aux_info) 5020 { 5021 aux_info_file = fopen (aux_info_file_name, "w"); 5022 if (aux_info_file == 0) 5023 fatal_io_error ("can't open %s", aux_info_file_name); 5024 } 5025 5026 if (! targetm.have_named_sections) 5027 { 5028 if (flag_function_sections) 5029 { 5030 warning ("-ffunction-sections not supported for this target"); 5031 flag_function_sections = 0; 5032 } 5033 if (flag_data_sections) 5034 { 5035 warning ("-fdata-sections not supported for this target"); 5036 flag_data_sections = 0; 5037 } 5038 } 5039 5040 if (flag_function_sections && profile_flag) 5041 { 5042 warning ("-ffunction-sections disabled; it makes profiling impossible"); 5043 flag_function_sections = 0; 5044 } 5045 5046#ifndef HAVE_prefetch 5047 if (flag_prefetch_loop_arrays) 5048 { 5049 warning ("-fprefetch-loop-arrays not supported for this target"); 5050 flag_prefetch_loop_arrays = 0; 5051 } 5052#else 5053 if (flag_prefetch_loop_arrays && !HAVE_prefetch) 5054 { 5055 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)"); 5056 flag_prefetch_loop_arrays = 0; 5057 } 5058#endif 5059 5060 /* This combination of options isn't handled for i386 targets and doesn't 5061 make much sense anyway, so don't allow it. */ 5062 if (flag_prefetch_loop_arrays && optimize_size) 5063 { 5064 warning ("-fprefetch-loop-arrays is not supported with -Os"); 5065 flag_prefetch_loop_arrays = 0; 5066 } 5067 5068#ifndef OBJECT_FORMAT_ELF 5069 if (flag_function_sections && write_symbols != NO_DEBUG) 5070 warning ("-ffunction-sections may affect debugging on some targets"); 5071#endif 5072} 5073 5074/* Language-independent initialization, before language-dependent 5075 initialization. */ 5076static void 5077lang_independent_init () 5078{ 5079 decl_printable_name = decl_name; 5080 lang_expand_expr = (lang_expand_expr_t) do_abort; 5081 5082 /* Set the language-dependent identifier size. */ 5083 tree_code_length[(int) IDENTIFIER_NODE] 5084 = ((lang_hooks.identifier_size - sizeof (struct tree_common) 5085 + sizeof (tree) - 1) / sizeof (tree)); 5086 5087 /* Initialize the garbage-collector, and string pools. */ 5088 init_ggc (); 5089 ggc_add_rtx_root (&stack_limit_rtx, 1); 5090 ggc_add_tree_root (¤t_function_decl, 1); 5091 ggc_add_tree_root (¤t_function_func_begin_label, 1); 5092 5093 init_stringpool (); 5094 init_obstacks (); 5095 5096 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL 5097 || debug_info_level == DINFO_LEVEL_VERBOSE 5098#ifdef VMS_DEBUGGING_INFO 5099 /* Enable line number info for traceback */ 5100 || debug_info_level > DINFO_LEVEL_NONE 5101#endif 5102 || flag_test_coverage 5103 || warn_notreached); 5104 init_regs (); 5105 init_alias_once (); 5106 init_stmt (); 5107 init_loop (); 5108 init_reload (); 5109 init_function_once (); 5110 init_stor_layout_once (); 5111 init_varasm_once (); 5112 init_EXPR_INSN_LIST_cache (); 5113 5114 /* The following initialization functions need to generate rtl, so 5115 provide a dummy function context for them. */ 5116 init_dummy_function_start (); 5117 init_expmed (); 5118 init_expr_once (); 5119 if (flag_caller_saves) 5120 init_caller_save (); 5121 expand_dummy_function_end (); 5122} 5123 5124/* Language-dependent initialization. Returns non-zero on success. */ 5125static int 5126lang_dependent_init (name) 5127 const char *name; 5128{ 5129 if (dump_base_name == 0) 5130 dump_base_name = name ? name : "gccdump"; 5131 5132 /* Front-end initialization. This hook can assume that GC, 5133 identifier hashes etc. are set up, but debug initialization is 5134 not done yet. This routine must return the original filename 5135 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */ 5136 name = (*lang_hooks.init) (name); 5137 if (name == NULL) 5138 return 0; 5139 5140 /* Is this duplication necessary? */ 5141 name = ggc_strdup (name); 5142 main_input_filename = input_filename = name; 5143 init_asm_output (name); 5144 5145 /* These create various _DECL nodes, so need to be called after the 5146 front end is initialized. */ 5147 init_eh (); 5148 init_optabs (); 5149 5150 /* Put an entry on the input file stack for the main input file. */ 5151 push_srcloc (input_filename, 0); 5152 5153 /* If dbx symbol table desired, initialize writing it and output the 5154 predefined types. */ 5155 timevar_push (TV_SYMOUT); 5156 5157#ifdef DWARF2_UNWIND_INFO 5158 if (dwarf2out_do_frame ()) 5159 dwarf2out_frame_init (); 5160#endif 5161 5162 /* Now we have the correct original filename, we can initialize 5163 debug output. */ 5164 (*debug_hooks->init) (name); 5165 5166 timevar_pop (TV_SYMOUT); 5167 5168 return 1; 5169} 5170 5171/* Clean up: close opened files, etc. */ 5172 5173static void 5174finalize () 5175{ 5176 /* Close the dump files. */ 5177 if (flag_gen_aux_info) 5178 { 5179 fclose (aux_info_file); 5180 if (errorcount) 5181 unlink (aux_info_file_name); 5182 } 5183 5184 /* Close non-debugging input and output files. Take special care to note 5185 whether fclose returns an error, since the pages might still be on the 5186 buffer chain while the file is open. */ 5187 5188 if (asm_out_file) 5189 { 5190 if (ferror (asm_out_file) != 0) 5191 fatal_io_error ("error writing to %s", asm_file_name); 5192 if (fclose (asm_out_file) != 0) 5193 fatal_io_error ("error closing %s", asm_file_name); 5194 } 5195 5196 /* Do whatever is necessary to finish printing the graphs. */ 5197 if (graph_dump_format != no_graph) 5198 { 5199 int i; 5200 5201 for (i = 0; i < (int) DFI_MAX; ++i) 5202 if (dump_file[i].initialized && dump_file[i].graph_dump_p) 5203 { 5204 char seq[16]; 5205 char *suffix; 5206 5207 sprintf (seq, DUMPFILE_FORMAT, i); 5208 suffix = concat (seq, dump_file[i].extension, NULL); 5209 finish_graph_dump_file (dump_base_name, suffix); 5210 free (suffix); 5211 } 5212 } 5213 5214 if (mem_report) 5215 { 5216 ggc_print_statistics (); 5217 stringpool_statistics (); 5218 dump_tree_statistics (); 5219 } 5220 5221 /* Free up memory for the benefit of leak detectors. */ 5222 free_reg_info (); 5223 5224 /* Language-specific end of compilation actions. */ 5225 (*lang_hooks.finish) (); 5226} 5227 5228/* Initialize the compiler, and compile the input file. */ 5229static void 5230do_compile () 5231{ 5232 /* The bulk of command line switch processing. */ 5233 process_options (); 5234 5235 /* We cannot start timing until after options are processed since that 5236 says if we run timers or not. */ 5237 init_timevar (); 5238 timevar_start (TV_TOTAL); 5239 5240 /* Language-independent initialization. Also sets up GC, identifier 5241 hashes etc. */ 5242 lang_independent_init (); 5243 5244 /* Language-dependent initialization. Returns true on success. */ 5245 if (lang_dependent_init (filename)) 5246 compile_file (); 5247 5248 finalize (); 5249 5250 /* Stop timing and print the times. */ 5251 timevar_stop (TV_TOTAL); 5252 timevar_print (stderr); 5253} 5254 5255/* Entry point of cc1, cc1plus, jc1, f771, etc. 5256 Decode command args, then call compile_file. 5257 Exit code is FATAL_EXIT_CODE if can't open files or if there were 5258 any errors, or SUCCESS_EXIT_CODE if compilation succeeded. 5259 5260 It is not safe to call this function more than once. */ 5261 5262int 5263toplev_main (argc, argv) 5264 int argc; 5265 char **argv; 5266{ 5267 hex_init (); 5268 5269 /* Initialization of GCC's environment, and diagnostics. */ 5270 general_init (argv [0]); 5271 5272 /* Parse the options and do minimal processing; basically just 5273 enough to default flags appropriately. */ 5274 parse_options_and_default_flags (argc, argv); 5275 5276 /* Exit early if we can (e.g. -help). */ 5277 if (!errorcount && !exit_after_options) 5278 do_compile (); 5279 5280 if (errorcount || sorrycount) 5281 return (FATAL_EXIT_CODE); 5282 5283 return (SUCCESS_EXIT_CODE); 5284} 5285