toplev.c revision 90282
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 90282 2002-02-06 04:59:39Z 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#ifdef VMS 98/* The extra parameters substantially improve the I/O performance. */ 99 100static FILE * 101vms_fopen (fname, type) 102 char *fname; 103 char *type; 104{ 105 /* The <stdio.h> in the gcc-vms-1.42 distribution prototypes fopen with two 106 fixed arguments, which matches ANSI's specification but not VAXCRTL's 107 pre-ANSI implementation. This hack circumvents the mismatch problem. */ 108 FILE *(*vmslib_fopen)() = (FILE *(*)()) fopen; 109 110 if (*type == 'w') 111 return (*vmslib_fopen) (fname, type, "mbc=32", 112 "deq=64", "fop=tef", "shr=nil"); 113 else 114 return (*vmslib_fopen) (fname, type, "mbc=32"); 115} 116 117#define fopen vms_fopen 118#endif /* VMS */ 119 120/* Carry information from ASM_DECLARE_OBJECT_NAME 121 to ASM_FINISH_DECLARE_OBJECT. */ 122 123extern int size_directive_output; 124extern tree last_assemble_variable_decl; 125 126static void general_init PARAMS ((char *)); 127static void parse_options_and_default_flags PARAMS ((int, char **)); 128static void do_compile PARAMS ((void)); 129static void process_options PARAMS ((void)); 130static void lang_independent_init PARAMS ((void)); 131static int lang_dependent_init PARAMS ((const char *)); 132static void init_asm_output PARAMS ((const char *)); 133static void finalize PARAMS ((void)); 134 135static void set_target_switch PARAMS ((const char *)); 136static const char *decl_name PARAMS ((tree, int)); 137 138static void float_signal PARAMS ((int)) ATTRIBUTE_NORETURN; 139static void crash_signal PARAMS ((int)) ATTRIBUTE_NORETURN; 140static void set_float_handler PARAMS ((jmp_buf)); 141static void compile_file PARAMS ((void)); 142static void display_help PARAMS ((void)); 143static void display_target_options PARAMS ((void)); 144 145static void decode_d_option PARAMS ((const char *)); 146static int decode_f_option PARAMS ((const char *)); 147static int decode_W_option PARAMS ((const char *)); 148static int decode_g_option PARAMS ((const char *)); 149static unsigned int independent_decode_option PARAMS ((int, char **)); 150 151static void print_version PARAMS ((FILE *, const char *)); 152static int print_single_switch PARAMS ((FILE *, int, int, const char *, 153 const char *, const char *, 154 const char *, const char *)); 155static void print_switch_values PARAMS ((FILE *, int, int, const char *, 156 const char *, const char *)); 157 158/* Length of line when printing switch values. */ 159#define MAX_LINE 75 160 161/* Name of program invoked, sans directories. */ 162 163const char *progname; 164 165/* Copy of arguments to toplev_main. */ 166int save_argc; 167char **save_argv; 168 169/* Name of current original source file (what was input to cpp). 170 This comes from each #-command in the actual input. */ 171 172const char *input_filename; 173 174/* Name of top-level original source file (what was input to cpp). 175 This comes from the #-command at the beginning of the actual input. 176 If there isn't any there, then this is the cc1 input file name. */ 177 178const char *main_input_filename; 179 180/* Current line number in real source file. */ 181 182int lineno; 183 184/* Nonzero if it is unsafe to create any new pseudo registers. */ 185int no_new_pseudos; 186 187/* Stack of currently pending input files. */ 188 189struct file_stack *input_file_stack; 190 191/* Incremented on each change to input_file_stack. */ 192int input_file_stack_tick; 193 194/* Name to use as base of names for dump output files. */ 195 196const char *dump_base_name; 197 198/* Format to use to print dumpfile index value */ 199#ifndef DUMPFILE_FORMAT 200#define DUMPFILE_FORMAT ".%02d." 201#endif 202 203/* Bit flags that specify the machine subtype we are compiling for. 204 Bits are tested using macros TARGET_... defined in the tm.h file 205 and set by `-m...' switches. Must be defined in rtlanal.c. */ 206 207extern int target_flags; 208 209/* Debug hooks - dependent upon command line options. */ 210 211struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks; 212 213/* Describes a dump file. */ 214 215struct dump_file_info 216{ 217 /* The unique extension to apply, e.g. ".jump". */ 218 const char *const extension; 219 220 /* The -d<c> character that enables this dump file. */ 221 char const debug_switch; 222 223 /* True if there is a corresponding graph dump file. */ 224 char const graph_dump_p; 225 226 /* True if the user selected this dump. */ 227 char enabled; 228 229 /* True if the files have been initialized (ie truncated). */ 230 char initialized; 231}; 232 233/* Enumerate the extant dump files. */ 234 235enum dump_file_index 236{ 237 DFI_rtl, 238 DFI_sibling, 239 DFI_eh, 240 DFI_jump, 241 DFI_ssa, 242 DFI_ssa_ccp, 243 DFI_ssa_dce, 244 DFI_ussa, 245 DFI_cse, 246 DFI_addressof, 247 DFI_gcse, 248 DFI_loop, 249 DFI_cse2, 250 DFI_cfg, 251 DFI_bp, 252 DFI_life, 253 DFI_combine, 254 DFI_ce, 255 DFI_regmove, 256 DFI_sched, 257 DFI_lreg, 258 DFI_greg, 259 DFI_postreload, 260 DFI_flow2, 261 DFI_peephole2, 262 DFI_rnreg, 263 DFI_ce2, 264 DFI_sched2, 265 DFI_stack, 266 DFI_bbro, 267 DFI_mach, 268 DFI_dbr, 269 DFI_MAX 270}; 271 272/* Describes all the dump files. Should be kept in order of the 273 pass and in sync with dump_file_index above. 274 275 Remaining -d letters: 276 277 " o q u " 278 " H JK OPQ TUV YZ" 279*/ 280 281static struct dump_file_info dump_file[DFI_MAX] = 282{ 283 { "rtl", 'r', 0, 0, 0 }, 284 { "sibling", 'i', 0, 0, 0 }, 285 { "eh", 'h', 0, 0, 0 }, 286 { "jump", 'j', 0, 0, 0 }, 287 { "ssa", 'e', 1, 0, 0 }, 288 { "ssaccp", 'W', 1, 0, 0 }, 289 { "ssadce", 'X', 1, 0, 0 }, 290 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */ 291 { "cse", 's', 0, 0, 0 }, 292 { "addressof", 'F', 0, 0, 0 }, 293 { "gcse", 'G', 1, 0, 0 }, 294 { "loop", 'L', 1, 0, 0 }, 295 { "cse2", 't', 1, 0, 0 }, 296 { "cfg", 'f', 1, 0, 0 }, 297 { "bp", 'b', 1, 0, 0 }, 298 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */ 299 { "combine", 'c', 1, 0, 0 }, 300 { "ce", 'C', 1, 0, 0 }, 301 { "regmove", 'N', 1, 0, 0 }, 302 { "sched", 'S', 1, 0, 0 }, 303 { "lreg", 'l', 1, 0, 0 }, 304 { "greg", 'g', 1, 0, 0 }, 305 { "postreload", 'o', 1, 0, 0 }, 306 { "flow2", 'w', 1, 0, 0 }, 307 { "peephole2", 'z', 1, 0, 0 }, 308 { "rnreg", 'n', 1, 0, 0 }, 309 { "ce2", 'E', 1, 0, 0 }, 310 { "sched2", 'R', 1, 0, 0 }, 311 { "stack", 'k', 1, 0, 0 }, 312 { "bbro", 'B', 1, 0, 0 }, 313 { "mach", 'M', 1, 0, 0 }, 314 { "dbr", 'd', 0, 0, 0 }, 315}; 316 317static int open_dump_file PARAMS ((enum dump_file_index, tree)); 318static void close_dump_file PARAMS ((enum dump_file_index, 319 void (*) (FILE *, rtx), rtx)); 320 321/* Other flags saying which kinds of debugging dump have been requested. */ 322 323int rtl_dump_and_exit; 324int flag_print_asm_name; 325static int version_flag; 326static char *filename; 327enum graph_dump_types graph_dump_format; 328 329/* Name for output file of assembly code, specified with -o. */ 330 331char *asm_file_name; 332 333/* Value of the -G xx switch, and whether it was passed or not. */ 334int g_switch_value; 335int g_switch_set; 336 337/* Type(s) of debugging information we are producing (if any). 338 See flags.h for the definitions of the different possible 339 types of debugging information. */ 340enum debug_info_type write_symbols = NO_DEBUG; 341 342/* Level of debugging information we are producing. See flags.h 343 for the definitions of the different possible levels. */ 344enum debug_info_level debug_info_level = DINFO_LEVEL_NONE; 345 346/* Nonzero means use GNU-only extensions in the generated symbolic 347 debugging information. */ 348/* Currently, this only has an effect when write_symbols is set to 349 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */ 350int use_gnu_debug_info_extensions = 0; 351 352/* Nonzero means do optimizations. -O. 353 Particular numeric values stand for particular amounts of optimization; 354 thus, -O2 stores 2 here. However, the optimizations beyond the basic 355 ones are not controlled directly by this variable. Instead, they are 356 controlled by individual `flag_...' variables that are defaulted 357 based on this variable. */ 358 359int optimize = 0; 360 361/* Nonzero means optimize for size. -Os. 362 The only valid values are zero and non-zero. When optimize_size is 363 non-zero, optimize defaults to 2, but certain individual code 364 bloating optimizations are disabled. */ 365 366int optimize_size = 0; 367 368/* Nonzero if we should exit after parsing options. */ 369static int exit_after_options = 0; 370 371/* The FUNCTION_DECL for the function currently being compiled, 372 or 0 if between functions. */ 373tree current_function_decl; 374 375/* Set to the FUNC_BEGIN label of the current function, or NULL_TREE 376 if none. */ 377tree current_function_func_begin_label; 378 379/* Pointer to function to compute the name to use to print a declaration. 380 DECL is the declaration in question. 381 VERBOSITY determines what information will be printed: 382 0: DECL_NAME, demangled as necessary. 383 1: and scope information. 384 2: and any other information that might be interesting, such as function 385 parameter types in C++. */ 386 387const char *(*decl_printable_name) PARAMS ((tree, int)); 388 389/* Pointer to function to compute rtl for a language-specific tree code. */ 390 391typedef rtx (*lang_expand_expr_t) 392 PARAMS ((union tree_node *, rtx, enum machine_mode, 393 enum expand_modifier modifier)); 394 395lang_expand_expr_t lang_expand_expr = 0; 396 397/* Pointer to function to finish handling an incomplete decl at the 398 end of compilation. */ 399 400void (*incomplete_decl_finalize_hook) PARAMS ((tree)) = 0; 401 402/* Nonzero if doing dwarf2 duplicate elimination. */ 403 404int flag_eliminate_dwarf2_dups = 0; 405 406/* Nonzero if generating code to do profiling. */ 407 408int profile_flag = 0; 409 410/* Nonzero if generating code to profile program flow graph arcs. */ 411 412int profile_arc_flag = 0; 413 414/* Nonzero if generating info for gcov to calculate line test coverage. */ 415 416int flag_test_coverage = 0; 417 418/* Nonzero indicates that branch taken probabilities should be calculated. */ 419 420int flag_branch_probabilities = 0; 421 422/* Nonzero if basic blocks should be reordered. */ 423 424int flag_reorder_blocks = 0; 425 426/* Nonzero if registers should be renamed. */ 427 428int flag_rename_registers = 0; 429int flag_cprop_registers = 0; 430 431/* Nonzero for -pedantic switch: warn about anything 432 that standard spec forbids. */ 433 434int pedantic = 0; 435 436/* Temporarily suppress certain warnings. 437 This is set while reading code from a system header file. */ 438 439int in_system_header = 0; 440 441/* Don't print functions as they are compiled. -quiet. */ 442 443int quiet_flag = 0; 444 445/* Print times taken by the various passes. -ftime-report. */ 446 447int time_report = 0; 448 449/* Print memory still in use at end of compilation (which may have little 450 to do with peak memory consumption). -fmem-report. */ 451 452int mem_report = 0; 453 454/* Non-zero means to collect statistics which might be expensive 455 and to print them when we are done. */ 456int flag_detailed_statistics = 0; 457 458 459/* -f flags. */ 460 461/* Nonzero means `char' should be signed. */ 462 463int flag_signed_char; 464 465/* Nonzero means give an enum type only as many bytes as it needs. */ 466 467int flag_short_enums; 468 469/* Nonzero for -fcaller-saves: allocate values in regs that need to 470 be saved across function calls, if that produces overall better code. 471 Optional now, so people can test it. */ 472 473#ifdef DEFAULT_CALLER_SAVES 474int flag_caller_saves = 1; 475#else 476int flag_caller_saves = 0; 477#endif 478 479/* Nonzero if structures and unions should be returned in memory. 480 481 This should only be defined if compatibility with another compiler or 482 with an ABI is needed, because it results in slower code. */ 483 484#ifndef DEFAULT_PCC_STRUCT_RETURN 485#define DEFAULT_PCC_STRUCT_RETURN 1 486#endif 487 488/* Nonzero for -fpcc-struct-return: return values the same way PCC does. */ 489 490int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN; 491 492/* Nonzero for -fforce-mem: load memory value into a register 493 before arithmetic on it. This makes better cse but slower compilation. */ 494 495int flag_force_mem = 0; 496 497/* Nonzero for -fforce-addr: load memory address into a register before 498 reference to memory. This makes better cse but slower compilation. */ 499 500int flag_force_addr = 0; 501 502/* Nonzero for -fdefer-pop: don't pop args after each function call; 503 instead save them up to pop many calls' args with one insns. */ 504 505int flag_defer_pop = 0; 506 507/* Nonzero for -ffloat-store: don't allocate floats and doubles 508 in extended-precision registers. */ 509 510int flag_float_store = 0; 511 512/* Nonzero for -fcse-follow-jumps: 513 have cse follow jumps to do a more extensive job. */ 514 515int flag_cse_follow_jumps; 516 517/* Nonzero for -fcse-skip-blocks: 518 have cse follow a branch around a block. */ 519int flag_cse_skip_blocks; 520 521/* Nonzero for -fexpensive-optimizations: 522 perform miscellaneous relatively-expensive optimizations. */ 523int flag_expensive_optimizations; 524 525/* Nonzero for -fthread-jumps: 526 have jump optimize output of loop. */ 527 528int flag_thread_jumps; 529 530/* Nonzero enables strength-reduction in loop.c. */ 531 532int flag_strength_reduce = 0; 533 534/* Nonzero enables loop unrolling in unroll.c. Only loops for which the 535 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY, 536 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are 537 unrolled. */ 538 539int flag_unroll_loops; 540 541/* Nonzero enables loop unrolling in unroll.c. All loops are unrolled. 542 This is generally not a win. */ 543 544int flag_unroll_all_loops; 545 546/* Nonzero enables prefetch optimizations for arrays in loops. */ 547 548int flag_prefetch_loop_arrays; 549 550/* Nonzero forces all invariant computations in loops to be moved 551 outside the loop. */ 552 553int flag_move_all_movables = 0; 554 555/* Nonzero forces all general induction variables in loops to be 556 strength reduced. */ 557 558int flag_reduce_all_givs = 0; 559 560/* Nonzero to perform full register move optimization passes. This is the 561 default for -O2. */ 562 563int flag_regmove = 0; 564 565/* Nonzero for -fwritable-strings: 566 store string constants in data segment and don't uniquize them. */ 567 568int flag_writable_strings = 0; 569 570/* Nonzero means don't put addresses of constant functions in registers. 571 Used for compiling the Unix kernel, where strange substitutions are 572 done on the assembly output. */ 573 574int flag_no_function_cse = 0; 575 576/* Nonzero for -fomit-frame-pointer: 577 don't make a frame pointer in simple functions that don't require one. */ 578 579int flag_omit_frame_pointer = 0; 580 581/* Nonzero means place each function into its own section on those platforms 582 which support arbitrary section names and unlimited numbers of sections. */ 583 584int flag_function_sections = 0; 585 586/* ... and similar for data. */ 587 588int flag_data_sections = 0; 589 590/* Nonzero to inhibit use of define_optimization peephole opts. */ 591 592int flag_no_peephole = 0; 593 594/* Nonzero allows GCC to optimize sibling and tail recursive calls. */ 595 596int flag_optimize_sibling_calls = 0; 597 598/* Nonzero means the front end generally wants `errno' maintained by math 599 operations, like built-in SQRT. */ 600 601int flag_errno_math = 1; 602 603/* Nonzero means that unsafe floating-point math optimizations are allowed 604 for the sake of speed. IEEE compliance is not guaranteed, and operations 605 are allowed to assume that their arguments and results are "normal" 606 (e.g., nonnegative for SQRT). */ 607 608int flag_unsafe_math_optimizations = 0; 609 610/* Zero means that floating-point math operations cannot generate a 611 (user-visible) trap. This is the case, for example, in nonstop 612 IEEE 754 arithmetic. */ 613 614int flag_trapping_math = 1; 615 616/* 0 means straightforward implementation of complex divide acceptable. 617 1 means wide ranges of inputs must work for complex divide. 618 2 means C99-like requirements for complex divide (not yet implemented). */ 619 620int flag_complex_divide_method = 0; 621 622/* Nonzero means all references through pointers are volatile. */ 623 624int flag_volatile; 625 626/* Nonzero means treat all global and extern variables as volatile. */ 627 628int flag_volatile_global; 629 630/* Nonzero means treat all static variables as volatile. */ 631 632int flag_volatile_static; 633 634/* Nonzero means just do syntax checking; don't output anything. */ 635 636int flag_syntax_only = 0; 637 638/* Nonzero means perform global cse. */ 639 640static int flag_gcse; 641 642/* Nonzero means to use global dataflow analysis to eliminate 643 useless null pointer tests. */ 644 645static int flag_delete_null_pointer_checks; 646 647/* Nonzero means to do the enhanced load motion during gcse, which trys 648 to hoist loads by not killing them when a store to the same location 649 is seen. */ 650 651int flag_gcse_lm = 1; 652 653/* Nonzero means to perform store motion after gcse, which will try to 654 move stores closer to the exit block. Its not very effective without 655 flag_gcse_lm. */ 656 657int flag_gcse_sm = 1; 658 659/* Nonzero means to rerun cse after loop optimization. This increases 660 compilation time about 20% and picks up a few more common expressions. */ 661 662static int flag_rerun_cse_after_loop; 663 664/* Nonzero means to run loop optimizations twice. */ 665 666int flag_rerun_loop_opt; 667 668/* Nonzero for -finline-functions: ok to inline functions that look like 669 good inline candidates. */ 670 671int flag_inline_functions; 672 673/* Nonzero for -fkeep-inline-functions: even if we make a function 674 go inline everywhere, keep its definition around for debugging 675 purposes. */ 676 677int flag_keep_inline_functions; 678 679/* Nonzero means that functions will not be inlined. */ 680 681int flag_no_inline; 682 683/* Nonzero means that we should emit static const variables 684 regardless of whether or not optimization is turned on. */ 685 686int flag_keep_static_consts = 1; 687 688/* Nonzero means we should be saving declaration info into a .X file. */ 689 690int flag_gen_aux_info = 0; 691 692/* Specified name of aux-info file. */ 693 694static char *aux_info_file_name; 695 696/* Nonzero means make the text shared if supported. */ 697 698int flag_shared_data; 699 700/* Nonzero means schedule into delayed branch slots if supported. */ 701 702int flag_delayed_branch; 703 704/* Nonzero if we are compiling pure (sharable) code. 705 Value is 1 if we are doing reasonable (i.e. simple 706 offset into offset table) pic. Value is 2 if we can 707 only perform register offsets. */ 708 709int flag_pic; 710 711/* Nonzero means generate extra code for exception handling and enable 712 exception handling. */ 713 714int flag_exceptions; 715 716/* Nonzero means generate frame unwind info table when supported. */ 717 718int flag_unwind_tables = 0; 719 720/* Nonzero means generate frame unwind info table exact at each insn boundary */ 721 722int flag_asynchronous_unwind_tables = 0; 723 724/* Nonzero means don't place uninitialized global data in common storage 725 by default. */ 726 727int flag_no_common; 728 729/* Nonzero means pretend it is OK to examine bits of target floats, 730 even if that isn't true. The resulting code will have incorrect constants, 731 but the same series of instructions that the native compiler would make. */ 732 733int flag_pretend_float; 734 735/* Nonzero means change certain warnings into errors. 736 Usually these are warnings about failure to conform to some standard. */ 737 738int flag_pedantic_errors = 0; 739 740/* flag_schedule_insns means schedule insns within basic blocks (before 741 local_alloc). 742 flag_schedule_insns_after_reload means schedule insns after 743 global_alloc. */ 744 745int flag_schedule_insns = 0; 746int flag_schedule_insns_after_reload = 0; 747 748/* The following flags have effect only for scheduling before register 749 allocation: 750 751 flag_schedule_interblock means schedule insns accross basic blocks. 752 flag_schedule_speculative means allow speculative motion of non-load insns. 753 flag_schedule_speculative_load means allow speculative motion of some 754 load insns. 755 flag_schedule_speculative_load_dangerous allows speculative motion of more 756 load insns. */ 757 758int flag_schedule_interblock = 1; 759int flag_schedule_speculative = 1; 760int flag_schedule_speculative_load = 0; 761int flag_schedule_speculative_load_dangerous = 0; 762 763int flag_single_precision_constant; 764 765/* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple 766 by a cheaper branch on a count register. */ 767int flag_branch_on_count_reg = 1; 768 769/* -finhibit-size-directive inhibits output of .size for ELF. 770 This is used only for compiling crtstuff.c, 771 and it may be extended to other effects 772 needed for crtstuff.c on other systems. */ 773int flag_inhibit_size_directive = 0; 774 775/* -fverbose-asm causes extra commentary information to be produced in 776 the generated assembly code (to make it more readable). This option 777 is generally only of use to those who actually need to read the 778 generated assembly code (perhaps while debugging the compiler itself). 779 -fno-verbose-asm, the default, causes the extra information 780 to be omitted and is useful when comparing two assembler files. */ 781 782int flag_verbose_asm = 0; 783 784/* -dA causes debug commentary information to be produced in 785 the generated assembly code (to make it more readable). This option 786 is generally only of use to those who actually need to read the 787 generated assembly code (perhaps while debugging the compiler itself). 788 Currently, this switch is only used by dwarfout.c; however, it is intended 789 to be a catchall for printing debug information in the assembler file. */ 790 791int flag_debug_asm = 0; 792 793/* -dP causes the rtl to be emitted as a comment in assembly. */ 794 795int flag_dump_rtl_in_asm = 0; 796 797/* -fgnu-linker specifies use of the GNU linker for initializations. 798 (Or, more generally, a linker that handles initializations.) 799 -fno-gnu-linker says that collect2 will be used. */ 800#ifdef USE_COLLECT2 801int flag_gnu_linker = 0; 802#else 803int flag_gnu_linker = 1; 804#endif 805 806/* Enable SSA. */ 807int flag_ssa = 0; 808 809/* Enable ssa conditional constant propagation. */ 810int flag_ssa_ccp = 0; 811 812/* Enable ssa aggressive dead code elimination. */ 813int flag_ssa_dce = 0; 814 815/* Tag all structures with __attribute__(packed). */ 816int flag_pack_struct = 0; 817 818/* Nonzero means that -Wformat accepts certain system-dependent formats. */ 819int flag_format_extensions = 0; 820 821/* Emit code to check for stack overflow; also may cause large objects 822 to be allocated dynamically. */ 823int flag_stack_check; 824 825/* When non-NULL, indicates that whenever space is allocated on the 826 stack, the resulting stack pointer must not pass this 827 address---that is, for stacks that grow downward, the stack pointer 828 must always be greater than or equal to this address; for stacks 829 that grow upward, the stack pointer must be less than this address. 830 At present, the rtx may be either a REG or a SYMBOL_REF, although 831 the support provided depends on the backend. */ 832rtx stack_limit_rtx; 833 834/* 0 if pointer arguments may alias each other. True in C. 835 1 if pointer arguments may not alias each other but may alias 836 global variables. 837 2 if pointer arguments may not alias each other and may not 838 alias global variables. True in Fortran. 839 This defaults to 0 for C. */ 840int flag_argument_noalias = 0; 841 842/* Nonzero if we should do (language-dependent) alias analysis. 843 Typically, this analysis will assume that expressions of certain 844 types do not alias expressions of certain other types. Only used 845 if alias analysis (in general) is enabled. */ 846int flag_strict_aliasing = 0; 847 848/* Instrument functions with calls at entry and exit, for profiling. */ 849int flag_instrument_function_entry_exit = 0; 850 851/* Nonzero means ignore `#ident' directives. 0 means handle them. 852 On SVR4 targets, it also controls whether or not to emit a 853 string identifying the compiler. */ 854 855int flag_no_ident = 0; 856 857/* This will perform a peephole pass before sched2. */ 858int flag_peephole2 = 0; 859 860/* This will try to guess branch probabilities. */ 861int flag_guess_branch_prob = 0; 862 863/* -fbounded-pointers causes gcc to compile pointers as composite 864 objects occupying three words: the pointer value, the base address 865 of the referent object, and the address immediately beyond the end 866 of the referent object. The base and extent allow us to perform 867 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */ 868int flag_bounded_pointers = 0; 869 870/* -fcheck-bounds causes gcc to generate array bounds checks. 871 For C, C++: defaults to value of flag_bounded_pointers. 872 For ObjC: defaults to off. 873 For Java: defaults to on. 874 For Fortran: defaults to off. 875 For CHILL: defaults to off. */ 876int flag_bounds_check = 0; 877 878/* This will attempt to merge constant section constants, if 1 only 879 string constants and constants from constant pool, if 2 also constant 880 variables. */ 881int flag_merge_constants = 1; 882 883/* If one, renumber instruction UIDs to reduce the number of 884 unused UIDs if there are a lot of instructions. If greater than 885 one, unconditionally renumber instruction UIDs. */ 886int flag_renumber_insns = 1; 887 888/* Values of the -falign-* flags: how much to align labels in code. 889 0 means `use default', 1 means `don't align'. 890 For each variable, there is an _log variant which is the power 891 of two not less than the variable, for .align output. */ 892 893int align_loops; 894int align_loops_log; 895int align_loops_max_skip; 896int align_jumps; 897int align_jumps_log; 898int align_jumps_max_skip; 899int align_labels; 900int align_labels_log; 901int align_labels_max_skip; 902int align_functions; 903int align_functions_log; 904 905/* Table of supported debugging formats. */ 906static const struct 907{ 908 const char *const arg; 909 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a 910 constant expression, we use NO_DEBUG in its place. */ 911 const enum debug_info_type debug_type; 912 const int use_extensions_p; 913 const char *const description; 914} *da, 915debug_args[] = 916{ 917 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS, 918 N_("Generate debugging info in default format") }, 919 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") }, 920#ifdef DBX_DEBUGGING_INFO 921 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") }, 922 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") }, 923#endif 924#ifdef DWARF_DEBUGGING_INFO 925 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") }, 926 { "dwarf+", DWARF_DEBUG, 1, 927 N_("Generate extended DWARF-1 format debug info") }, 928#endif 929#ifdef DWARF2_DEBUGGING_INFO 930 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") }, 931#endif 932#ifdef XCOFF_DEBUGGING_INFO 933 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") }, 934 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") }, 935#endif 936#ifdef SDB_DEBUGGING_INFO 937 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") }, 938#endif 939 { 0, 0, 0, 0 } 940}; 941 942typedef struct 943{ 944 const char *const string; 945 int *const variable; 946 const int on_value; 947 const char *const description; 948} 949lang_independent_options; 950 951int flag_trapv = 0; 952 953/* Add or remove a leading underscore from user symbols. */ 954int flag_leading_underscore = -1; 955 956/* The user symbol prefix after having resolved same. */ 957const char *user_label_prefix; 958 959static const param_info lang_independent_params[] = { 960#define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \ 961 { OPTION, DEFAULT, HELP }, 962#include "params.def" 963#undef DEFPARAM 964 { NULL, 0, NULL } 965}; 966 967/* A default for same. */ 968#ifndef USER_LABEL_PREFIX 969#define USER_LABEL_PREFIX "" 970#endif 971 972/* Table of language-independent -f options. 973 STRING is the option name. VARIABLE is the address of the variable. 974 ON_VALUE is the value to store in VARIABLE 975 if `-fSTRING' is seen as an option. 976 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */ 977 978static const lang_independent_options f_options[] = 979{ 980 {"format-extensions", &flag_format_extensions, 1, 981 N_("-Wformat accepts certain FreeBSD system-dependent formats") }, 982 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1, 983 N_("Perform DWARF2 duplicate elimination") }, 984 {"float-store", &flag_float_store, 1, 985 N_("Do not store floats in registers") }, 986 {"volatile", &flag_volatile, 1, 987 N_("Consider all mem refs through pointers as volatile") }, 988 {"volatile-global", &flag_volatile_global, 1, 989 N_("Consider all mem refs to global data to be volatile") }, 990 {"volatile-static", &flag_volatile_static, 1, 991 N_("Consider all mem refs to static data to be volatile") }, 992 {"defer-pop", &flag_defer_pop, 1, 993 N_("Defer popping functions args from stack until later") }, 994 {"omit-frame-pointer", &flag_omit_frame_pointer, 1, 995 N_("When possible do not generate stack frames") }, 996 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1, 997 N_("Optimize sibling and tail recursive calls") }, 998 {"cse-follow-jumps", &flag_cse_follow_jumps, 1, 999 N_("When running CSE, follow jumps to their targets") }, 1000 {"cse-skip-blocks", &flag_cse_skip_blocks, 1, 1001 N_("When running CSE, follow conditional jumps") }, 1002 {"expensive-optimizations", &flag_expensive_optimizations, 1, 1003 N_("Perform a number of minor, expensive optimizations") }, 1004 {"thread-jumps", &flag_thread_jumps, 1, 1005 N_("Perform jump threading optimizations") }, 1006 {"strength-reduce", &flag_strength_reduce, 1, 1007 N_("Perform strength reduction optimizations") }, 1008 {"unroll-loops", &flag_unroll_loops, 1, 1009 N_("Perform loop unrolling when iteration count is known") }, 1010 {"unroll-all-loops", &flag_unroll_all_loops, 1, 1011 N_("Perform loop unrolling for all loops") }, 1012 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1, 1013 N_("Generate prefetch instructions, if available, for arrays in loops") }, 1014 {"move-all-movables", &flag_move_all_movables, 1, 1015 N_("Force all loop invariant computations out of loops") }, 1016 {"reduce-all-givs", &flag_reduce_all_givs, 1, 1017 N_("Strength reduce all loop general induction variables") }, 1018 {"writable-strings", &flag_writable_strings, 1, 1019 N_("Store strings in writable data section") }, 1020 {"peephole", &flag_no_peephole, 0, 1021 N_("Enable machine specific peephole optimizations") }, 1022 {"force-mem", &flag_force_mem, 1, 1023 N_("Copy memory operands into registers before using") }, 1024 {"force-addr", &flag_force_addr, 1, 1025 N_("Copy memory address constants into regs before using") }, 1026 {"function-cse", &flag_no_function_cse, 0, 1027 N_("Allow function addresses to be held in registers") }, 1028 {"inline-functions", &flag_inline_functions, 1, 1029 N_("Integrate simple functions into their callers") }, 1030 {"keep-inline-functions", &flag_keep_inline_functions, 1, 1031 N_("Generate code for funcs even if they are fully inlined") }, 1032 {"inline", &flag_no_inline, 0, 1033 N_("Pay attention to the 'inline' keyword") }, 1034 {"keep-static-consts", &flag_keep_static_consts, 1, 1035 N_("Emit static const variables even if they are not used") }, 1036 {"syntax-only", &flag_syntax_only, 1, 1037 N_("Check for syntax errors, then stop") }, 1038 {"shared-data", &flag_shared_data, 1, 1039 N_("Mark data as shared rather than private") }, 1040 {"caller-saves", &flag_caller_saves, 1, 1041 N_("Enable saving registers around function calls") }, 1042 {"pcc-struct-return", &flag_pcc_struct_return, 1, 1043 N_("Return 'short' aggregates in memory, not registers") }, 1044 {"reg-struct-return", &flag_pcc_struct_return, 0, 1045 N_("Return 'short' aggregates in registers") }, 1046 {"delayed-branch", &flag_delayed_branch, 1, 1047 N_("Attempt to fill delay slots of branch instructions") }, 1048 {"gcse", &flag_gcse, 1, 1049 N_("Perform the global common subexpression elimination") }, 1050 {"gcse-lm", &flag_gcse_lm, 1, 1051 N_("Perform enhanced load motion during global subexpression elimination") }, 1052 {"gcse-sm", &flag_gcse_sm, 1, 1053 N_("Perform store motion after global subexpression elimination") }, 1054 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1, 1055 N_("Run CSE pass after loop optimizations") }, 1056 {"rerun-loop-opt", &flag_rerun_loop_opt, 1, 1057 N_("Run the loop optimizer twice") }, 1058 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1, 1059 N_("Delete useless null pointer checks") }, 1060 {"pretend-float", &flag_pretend_float, 1, 1061 N_("Pretend that host and target use the same FP format") }, 1062 {"schedule-insns", &flag_schedule_insns, 1, 1063 N_("Reschedule instructions before register allocation") }, 1064 {"schedule-insns2", &flag_schedule_insns_after_reload, 1, 1065 N_("Reschedule instructions after register allocation") }, 1066 {"sched-interblock",&flag_schedule_interblock, 1, 1067 N_("Enable scheduling across basic blocks") }, 1068 {"sched-spec",&flag_schedule_speculative, 1, 1069 N_("Allow speculative motion of non-loads") }, 1070 {"sched-spec-load",&flag_schedule_speculative_load, 1, 1071 N_("Allow speculative motion of some loads") }, 1072 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1, 1073 N_("Allow speculative motion of more loads") }, 1074 {"branch-count-reg",&flag_branch_on_count_reg, 1, 1075 N_("Replace add,compare,branch with branch on count reg") }, 1076 {"pic", &flag_pic, 1, 1077 N_("Generate position independent code, if possible") }, 1078 {"PIC", &flag_pic, 2, ""}, 1079 {"exceptions", &flag_exceptions, 1, 1080 N_("Enable exception handling") }, 1081 {"unwind-tables", &flag_unwind_tables, 1, 1082 N_("Just generate unwind tables for exception handling") }, 1083 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1, 1084 N_("Generate unwind tables exact at each instruction boundary") }, 1085 {"non-call-exceptions", &flag_non_call_exceptions, 1, 1086 N_("Support synchronous non-call exceptions") }, 1087 {"profile-arcs", &profile_arc_flag, 1, 1088 N_("Insert arc based program profiling code") }, 1089 {"test-coverage", &flag_test_coverage, 1, 1090 N_("Create data files needed by gcov") }, 1091 {"branch-probabilities", &flag_branch_probabilities, 1, 1092 N_("Use profiling information for branch probabilities") }, 1093 {"reorder-blocks", &flag_reorder_blocks, 1, 1094 N_("Reorder basic blocks to improve code placement") }, 1095 {"rename-registers", &flag_rename_registers, 1, 1096 N_("Do the register renaming optimization pass") }, 1097 {"cprop-registers", &flag_cprop_registers, 1, 1098 N_("Do the register copy-propagation optimization pass") }, 1099 {"common", &flag_no_common, 0, 1100 N_("Do not put uninitialized globals in the common section") }, 1101 {"inhibit-size-directive", &flag_inhibit_size_directive, 1, 1102 N_("Do not generate .size directives") }, 1103 {"function-sections", &flag_function_sections, 1, 1104 N_("place each function into its own section") }, 1105 {"data-sections", &flag_data_sections, 1, 1106 N_("place data items into their own section") }, 1107 {"verbose-asm", &flag_verbose_asm, 1, 1108 N_("Add extra commentry to assembler output") }, 1109 {"gnu-linker", &flag_gnu_linker, 1, 1110 N_("Output GNU ld formatted global initializers") }, 1111 {"regmove", &flag_regmove, 1, 1112 N_("Enables a register move optimization") }, 1113 {"optimize-register-move", &flag_regmove, 1, 1114 N_("Do the full regmove optimization pass") }, 1115 {"pack-struct", &flag_pack_struct, 1, 1116 N_("Pack structure members together without holes") }, 1117 {"stack-check", &flag_stack_check, 1, 1118 N_("Insert stack checking code into the program") }, 1119 {"argument-alias", &flag_argument_noalias, 0, 1120 N_("Specify that arguments may alias each other & globals") }, 1121 {"argument-noalias", &flag_argument_noalias, 1, 1122 N_("Assume arguments may alias globals but not each other") }, 1123 {"argument-noalias-global", &flag_argument_noalias, 2, 1124 N_("Assume arguments do not alias each other or globals") }, 1125 {"strict-aliasing", &flag_strict_aliasing, 1, 1126 N_("Assume strict aliasing rules apply") }, 1127 {"align-loops", &align_loops, 0, 1128 N_("Align the start of loops") }, 1129 {"align-jumps", &align_jumps, 0, 1130 N_("Align labels which are only reached by jumping") }, 1131 {"align-labels", &align_labels, 0, 1132 N_("Align all labels") }, 1133 {"align-functions", &align_functions, 0, 1134 N_("Align the start of functions") }, 1135 {"merge-constants", &flag_merge_constants, 1, 1136 N_("Attempt to merge identical constants accross compilation units") }, 1137 {"merge-all-constants", &flag_merge_constants, 2, 1138 N_("Attempt to merge identical constants and constant variables") }, 1139 {"dump-unnumbered", &flag_dump_unnumbered, 1, 1140 N_("Suppress output of instruction numbers and line number notes in debugging dumps") }, 1141 {"instrument-functions", &flag_instrument_function_entry_exit, 1, 1142 N_("Instrument function entry/exit with profiling calls") }, 1143 {"ssa", &flag_ssa, 1, 1144 N_("Enable SSA optimizations") }, 1145 {"ssa-ccp", &flag_ssa_ccp, 1, 1146 N_("Enable SSA conditional constant propagation") }, 1147 {"ssa-dce", &flag_ssa_dce, 1, 1148 N_("Enable aggressive SSA dead code elimination") }, 1149 {"leading-underscore", &flag_leading_underscore, 1, 1150 N_("External symbols have a leading underscore") }, 1151 {"ident", &flag_no_ident, 0, 1152 N_("Process #ident directives") }, 1153 { "peephole2", &flag_peephole2, 1, 1154 N_("Enables an rtl peephole pass run before sched2") }, 1155 { "guess-branch-probability", &flag_guess_branch_prob, 1, 1156 N_("Enables guessing of branch probabilities") }, 1157 {"math-errno", &flag_errno_math, 1, 1158 N_("Set errno after built-in math functions") }, 1159 {"trapping-math", &flag_trapping_math, 1, 1160 N_("Floating-point operations can trap") }, 1161 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1, 1162 N_("Allow math optimizations that may violate IEEE or ANSI standards") }, 1163 {"bounded-pointers", &flag_bounded_pointers, 1, 1164 N_("Compile pointers as triples: value, base & end") }, 1165 {"bounds-check", &flag_bounds_check, 1, 1166 N_("Generate code to check bounds before dereferencing pointers and arrays") }, 1167 {"single-precision-constant", &flag_single_precision_constant, 1, 1168 N_("Convert floating point constant to single precision constant") }, 1169 {"time-report", &time_report, 1, 1170 N_("Report time taken by each compiler pass at end of run") }, 1171 {"mem-report", &mem_report, 1, 1172 N_("Report on permanent memory allocation at end of run") }, 1173 { "trapv", &flag_trapv, 1, 1174 N_("Trap for signed overflow in addition / subtraction / multiplication") }, 1175}; 1176 1177/* Table of language-specific options. */ 1178 1179static const struct lang_opt 1180{ 1181 const char *const option; 1182 const char *const description; 1183} 1184documented_lang_options[] = 1185{ 1186 /* In order not to overload the --help output, the convention 1187 used here is to only describe those options which are not 1188 enabled by default. */ 1189 1190 { "-ansi", 1191 N_("Compile just for ISO C89") }, 1192 { "-fallow-single-precision", 1193 N_("Do not promote floats to double if using -traditional") }, 1194 { "-std= ", 1195 N_("Determine language standard") }, 1196 1197 { "-fsigned-bitfields", "" }, 1198 { "-funsigned-bitfields", 1199 N_("Make bit-fields by unsigned by default") }, 1200 { "-fno-signed-bitfields", "" }, 1201 { "-fno-unsigned-bitfields","" }, 1202 { "-fsigned-char", 1203 N_("Make 'char' be signed by default") }, 1204 { "-funsigned-char", 1205 N_("Make 'char' be unsigned by default") }, 1206 { "-fno-signed-char", "" }, 1207 { "-fno-unsigned-char", "" }, 1208 1209 { "-ftraditional", "" }, 1210 { "-traditional", 1211 N_("Attempt to support traditional K&R style C") }, 1212 { "-fnotraditional", "" }, 1213 { "-fno-traditional", "" }, 1214 1215 { "-fasm", "" }, 1216 { "-fno-asm", 1217 N_("Do not recognize the 'asm' keyword") }, 1218 { "-fbuiltin", "" }, 1219 { "-fno-builtin", 1220 N_("Do not recognize any built in functions") }, 1221 { "-fhosted", 1222 N_("Assume normal C execution environment") }, 1223 { "-fno-hosted", "" }, 1224 { "-ffreestanding", 1225 N_("Assume that standard libraries & main might not exist") }, 1226 { "-fno-freestanding", "" }, 1227 { "-fcond-mismatch", 1228 N_("Allow different types as args of ? operator") }, 1229 { "-fno-cond-mismatch", "" }, 1230 { "-fdollars-in-identifiers", 1231 N_("Allow the use of $ inside identifiers") }, 1232 { "-fno-dollars-in-identifiers", "" }, 1233 { "-fpreprocessed", "" }, 1234 { "-fno-preprocessed", "" }, 1235 { "-fshort-double", 1236 N_("Use the same size for double as for float") }, 1237 { "-fno-short-double", "" }, 1238 { "-fshort-enums", 1239 N_("Use the smallest fitting integer to hold enums") }, 1240 { "-fno-short-enums", "" }, 1241 { "-fshort-wchar", 1242 N_("Override the underlying type for wchar_t to `unsigned short'") }, 1243 { "-fno-short-wchar", "" }, 1244 1245 { "-Wall", 1246 N_("Enable most warning messages") }, 1247 { "-Wbad-function-cast", 1248 N_("Warn about casting functions to incompatible types") }, 1249 { "-Wno-bad-function-cast", "" }, 1250 { "-Wno-missing-noreturn", "" }, 1251 { "-Wmissing-format-attribute", 1252 N_("Warn about functions which might be candidates for format attributes") }, 1253 { "-Wno-missing-format-attribute", "" }, 1254 { "-Wcast-qual", 1255 N_("Warn about casts which discard qualifiers") }, 1256 { "-Wno-cast-qual", "" }, 1257 { "-Wchar-subscripts", 1258 N_("Warn about subscripts whose type is 'char'") }, 1259 { "-Wno-char-subscripts", "" }, 1260 { "-Wcomment", 1261 N_("Warn if nested comments are detected") }, 1262 { "-Wno-comment", "" }, 1263 { "-Wcomments", 1264 N_("Warn if nested comments are detected") }, 1265 { "-Wno-comments", "" }, 1266 { "-Wconversion", 1267 N_("Warn about possibly confusing type conversions") }, 1268 { "-Wno-conversion", "" }, 1269 { "-Wformat", 1270 N_("Warn about printf/scanf/strftime/strfmon format anomalies") }, 1271 { "-Wno-format", "" }, 1272 { "-Wformat-y2k", "" }, 1273 { "-Wno-format-y2k", 1274 N_("Don't warn about strftime formats yielding 2 digit years") }, 1275 { "-Wformat-extra-args", "" }, 1276 { "-Wno-format-extra-args", 1277 N_("Don't warn about too many arguments to format functions") }, 1278 { "-Wformat-nonliteral", 1279 N_("Warn about non-string-literal format strings") }, 1280 { "-Wno-format-nonliteral", "" }, 1281 { "-Wformat-security", 1282 N_("Warn about possible security problems with format functions") }, 1283 { "-Wno-format-security", "" }, 1284 { "-Wimplicit-function-declaration", 1285 N_("Warn about implicit function declarations") }, 1286 { "-Wno-implicit-function-declaration", "" }, 1287 { "-Werror-implicit-function-declaration", "" }, 1288 { "-Wimplicit-int", 1289 N_("Warn when a declaration does not specify a type") }, 1290 { "-Wno-implicit-int", "" }, 1291 { "-Wimplicit", "" }, 1292 { "-Wno-implicit", "" }, 1293 { "-Wimport", 1294 N_("Warn about the use of the #import directive") }, 1295 { "-Wno-import", "" }, 1296 { "-Wlong-long","" }, 1297 { "-Wno-long-long", 1298 N_("Do not warn about using 'long long' when -pedantic") }, 1299 { "-Wmain", 1300 N_("Warn about suspicious declarations of main") }, 1301 { "-Wno-main", "" }, 1302 { "-Wmissing-braces", 1303 N_("Warn about possibly missing braces around initializers") }, 1304 { "-Wno-missing-braces", "" }, 1305 { "-Wmissing-declarations", 1306 N_("Warn about global funcs without previous declarations") }, 1307 { "-Wno-missing-declarations", "" }, 1308 { "-Wmissing-prototypes", 1309 N_("Warn about global funcs without prototypes") }, 1310 { "-Wno-missing-prototypes", "" }, 1311 { "-Wmultichar", 1312 N_("Warn about use of multicharacter literals") }, 1313 { "-Wno-multichar", "" }, 1314 { "-Wnested-externs", 1315 N_("Warn about externs not at file scope level") }, 1316 { "-Wno-nested-externs", "" }, 1317 { "-Wparentheses", 1318 N_("Warn about possible missing parentheses") }, 1319 { "-Wno-parentheses", "" }, 1320 { "-Wsequence-point", 1321 N_("Warn about possible violations of sequence point rules") }, 1322 { "-Wno-sequence-point", "" }, 1323 { "-Wpointer-arith", 1324 N_("Warn about function pointer arithmetic") }, 1325 { "-Wno-pointer-arith", "" }, 1326 { "-Wredundant-decls", 1327 N_("Warn about multiple declarations of the same object") }, 1328 { "-Wno-redundant-decls", "" }, 1329 { "-Wsign-compare", 1330 N_("Warn about signed/unsigned comparisons") }, 1331 { "-Wno-sign-compare", "" }, 1332 { "-Wfloat-equal", 1333 N_("Warn about testing equality of floating point numbers") }, 1334 { "-Wno-float-equal", "" }, 1335 { "-Wunknown-pragmas", 1336 N_("Warn about unrecognized pragmas") }, 1337 { "-Wno-unknown-pragmas", "" }, 1338 { "-Wstrict-prototypes", 1339 N_("Warn about non-prototyped function decls") }, 1340 { "-Wno-strict-prototypes", "" }, 1341 { "-Wtraditional", 1342 N_("Warn about constructs whose meaning change in ISO C") }, 1343 { "-Wno-traditional", "" }, 1344 { "-Wtrigraphs", 1345 N_("Warn when trigraphs are encountered") }, 1346 { "-Wno-trigraphs", "" }, 1347 { "-Wundef", "" }, 1348 { "-Wno-undef", "" }, 1349 { "-Wwrite-strings", 1350 N_("Mark strings as 'const char *'") }, 1351 { "-Wno-write-strings", "" }, 1352 1353#define DEFINE_LANG_NAME(NAME) { NULL, NAME }, 1354 1355#include "options.h" 1356 1357}; 1358 1359/* Here is a table, controlled by the tm.h file, listing each -m switch 1360 and which bits in `target_switches' it should set or clear. 1361 If VALUE is positive, it is bits to set. 1362 If VALUE is negative, -VALUE is bits to clear. 1363 (The sign bit is not used so there is no confusion.) */ 1364 1365static const struct 1366{ 1367 const char *const name; 1368 const int value; 1369 const char *const description; 1370} 1371target_switches [] = TARGET_SWITCHES; 1372 1373/* This table is similar, but allows the switch to have a value. */ 1374 1375#ifdef TARGET_OPTIONS 1376static const struct 1377{ 1378 const char *const prefix; 1379 const char **const variable; 1380 const char *const description; 1381} 1382target_options [] = TARGET_OPTIONS; 1383#endif 1384 1385/* Options controlling warnings. */ 1386 1387/* Don't print warning messages. -w. */ 1388 1389int inhibit_warnings = 0; 1390 1391/* Don't suppress warnings from system headers. -Wsystem-headers. */ 1392 1393int warn_system_headers = 0; 1394 1395/* Print various extra warnings. -W. */ 1396 1397int extra_warnings = 0; 1398 1399/* Treat warnings as errors. -Werror. */ 1400 1401int warnings_are_errors = 0; 1402 1403/* Nonzero to warn about unused variables, functions et.al. */ 1404 1405int warn_unused_function; 1406int warn_unused_label; 1407int warn_unused_parameter; 1408int warn_unused_variable; 1409int warn_unused_value; 1410 1411/* Nonzero to warn about code which is never reached. */ 1412 1413int warn_notreached; 1414 1415/* Nonzero to warn about variables used before they are initialized. */ 1416 1417int warn_uninitialized; 1418 1419/* Nonzero means warn about all declarations which shadow others. */ 1420 1421int warn_shadow; 1422 1423/* Warn if a switch on an enum fails to have a case for every enum value. */ 1424 1425int warn_switch; 1426 1427/* Nonzero means warn about function definitions that default the return type 1428 or that use a null return and have a return-type other than void. */ 1429 1430int warn_return_type; 1431 1432/* Nonzero means warn about pointer casts that increase the required 1433 alignment of the target type (and might therefore lead to a crash 1434 due to a misaligned access). */ 1435 1436int warn_cast_align; 1437 1438/* Nonzero means warn about any objects definitions whose size is larger 1439 than N bytes. Also want about function definitions whose returned 1440 values are larger than N bytes. The value N is in `larger_than_size'. */ 1441 1442int warn_larger_than; 1443HOST_WIDE_INT larger_than_size; 1444 1445/* Nonzero means warn if inline function is too large. */ 1446 1447int warn_inline; 1448 1449/* Warn if a function returns an aggregate, 1450 since there are often incompatible calling conventions for doing this. */ 1451 1452int warn_aggregate_return; 1453 1454/* Warn if packed attribute on struct is unnecessary and inefficient. */ 1455 1456int warn_packed; 1457 1458/* Warn when gcc pads a structure to an alignment boundary. */ 1459 1460int warn_padded; 1461 1462/* Warn when an optimization pass is disabled. */ 1463 1464int warn_disabled_optimization; 1465 1466/* Warn about functions which might be candidates for attribute noreturn. */ 1467 1468int warn_missing_noreturn; 1469 1470/* Nonzero means warn about uses of __attribute__((deprecated)) 1471 declarations. */ 1472 1473int warn_deprecated_decl = 1; 1474 1475/* Likewise for -W. */ 1476 1477static const lang_independent_options W_options[] = 1478{ 1479 {"unused-function", &warn_unused_function, 1, 1480 N_("Warn when a function is unused") }, 1481 {"unused-label", &warn_unused_label, 1, 1482 N_("Warn when a label is unused") }, 1483 {"unused-parameter", &warn_unused_parameter, 1, 1484 N_("Warn when a function parameter is unused") }, 1485 {"unused-variable", &warn_unused_variable, 1, 1486 N_("Warn when a variable is unused") }, 1487 {"unused-value", &warn_unused_value, 1, 1488 N_("Warn when an expression value is unused") }, 1489 {"system-headers", &warn_system_headers, 1, 1490 N_("Do not suppress warnings from system headers") }, 1491 {"error", &warnings_are_errors, 1, 1492 N_("Treat all warnings as errors") }, 1493 {"shadow", &warn_shadow, 1, 1494 N_("Warn when one local variable shadows another") }, 1495 {"switch", &warn_switch, 1, 1496 N_("Warn about enumerated switches missing a specific case") }, 1497 {"aggregate-return", &warn_aggregate_return, 1, 1498 N_("Warn about returning structures, unions or arrays") }, 1499 {"cast-align", &warn_cast_align, 1, 1500 N_("Warn about pointer casts which increase alignment") }, 1501 {"unreachable-code", &warn_notreached, 1, 1502 N_("Warn about code that will never be executed") }, 1503 {"uninitialized", &warn_uninitialized, 1, 1504 N_("Warn about uninitialized automatic variables") }, 1505 {"inline", &warn_inline, 1, 1506 N_("Warn when an inlined function cannot be inlined") }, 1507 {"packed", &warn_packed, 1, 1508 N_("Warn when the packed attribute has no effect on struct layout") }, 1509 {"padded", &warn_padded, 1, 1510 N_("Warn when padding is required to align struct members") }, 1511 {"disabled-optimization", &warn_disabled_optimization, 1, 1512 N_("Warn when an optimization pass is disabled") }, 1513 {"deprecated-declarations", &warn_deprecated_decl, 1, 1514 N_("Warn about uses of __attribute__((deprecated)) declarations") }, 1515 {"missing-noreturn", &warn_missing_noreturn, 1, 1516 N_("Warn about functions which might be candidates for attribute noreturn") } 1517}; 1518 1519void 1520set_Wunused (setting) 1521 int setting; 1522{ 1523 warn_unused_function = setting; 1524 warn_unused_label = setting; 1525 /* Unused function parameter warnings are reported when either ``-W 1526 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate 1527 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */ 1528 if (!setting) 1529 warn_unused_parameter = 0; 1530 else if (!warn_unused_parameter) 1531 warn_unused_parameter = -1; 1532 warn_unused_variable = setting; 1533 warn_unused_value = setting; 1534} 1535 1536/* The following routines are useful in setting all the flags that 1537 -ffast-math and -fno-fast-math imply. */ 1538 1539void 1540set_fast_math_flags () 1541{ 1542 flag_trapping_math = 0; 1543 flag_unsafe_math_optimizations = 1; 1544 flag_errno_math = 0; 1545} 1546 1547void 1548set_no_fast_math_flags () 1549{ 1550 flag_trapping_math = 1; 1551 flag_unsafe_math_optimizations = 0; 1552 flag_errno_math = 1; 1553} 1554 1555 1556/* Output files for assembler code (real compiler output) 1557 and debugging dumps. */ 1558 1559FILE *asm_out_file; 1560FILE *aux_info_file; 1561FILE *rtl_dump_file = NULL; 1562 1563/* Decode the string P as an integral parameter. 1564 If the string is indeed an integer return its numeric value else 1565 issue an Invalid Option error for the option PNAME and return DEFVAL. 1566 If PNAME is zero just return DEFVAL, do not call error. */ 1567 1568int 1569read_integral_parameter (p, pname, defval) 1570 const char *p; 1571 const char *pname; 1572 const int defval; 1573{ 1574 const char *endp = p; 1575 1576 while (*endp) 1577 { 1578 if (ISDIGIT (*endp)) 1579 endp++; 1580 else 1581 break; 1582 } 1583 1584 if (*endp != 0) 1585 { 1586 if (pname != 0) 1587 error ("invalid option `%s'", pname); 1588 return defval; 1589 } 1590 1591 return atoi (p); 1592} 1593 1594 1595/* This is the default decl_printable_name function. */ 1596 1597static const char * 1598decl_name (decl, verbosity) 1599 tree decl; 1600 int verbosity ATTRIBUTE_UNUSED; 1601{ 1602 return IDENTIFIER_POINTER (DECL_NAME (decl)); 1603} 1604 1605 1606/* This calls abort and is used to avoid problems when abort if a macro. 1607 It is used when we need to pass the address of abort. */ 1608 1609void 1610do_abort () 1611{ 1612 abort (); 1613} 1614 1615/* When `malloc.c' is compiled with `rcheck' defined, 1616 it calls this function to report clobberage. */ 1617 1618void 1619botch (s) 1620 const char *s ATTRIBUTE_UNUSED; 1621{ 1622 abort (); 1623} 1624 1625/* Return the logarithm of X, base 2, considering X unsigned, 1626 if X is a power of 2. Otherwise, returns -1. 1627 1628 This should be used via the `exact_log2' macro. */ 1629 1630int 1631exact_log2_wide (x) 1632 unsigned HOST_WIDE_INT x; 1633{ 1634 int log = 0; 1635 /* Test for 0 or a power of 2. */ 1636 if (x == 0 || x != (x & -x)) 1637 return -1; 1638 while ((x >>= 1) != 0) 1639 log++; 1640 return log; 1641} 1642 1643/* Given X, an unsigned number, return the largest int Y such that 2**Y <= X. 1644 If X is 0, return -1. 1645 1646 This should be used via the floor_log2 macro. */ 1647 1648int 1649floor_log2_wide (x) 1650 unsigned HOST_WIDE_INT x; 1651{ 1652 int log = -1; 1653 while (x != 0) 1654 log++, 1655 x >>= 1; 1656 return log; 1657} 1658 1659static int float_handler_set; 1660int float_handled; 1661jmp_buf float_handler; 1662 1663/* Signals actually come here. */ 1664 1665static void 1666float_signal (signo) 1667 /* If this is missing, some compilers complain. */ 1668 int signo ATTRIBUTE_UNUSED; 1669{ 1670 if (float_handled == 0) 1671 crash_signal (signo); 1672 float_handled = 0; 1673 1674 /* On System-V derived systems, we must reinstall the signal handler. 1675 This is harmless on BSD-derived systems. */ 1676 signal (SIGFPE, float_signal); 1677 longjmp (float_handler, 1); 1678} 1679 1680/* Specify where to longjmp to when a floating arithmetic error happens. 1681 If HANDLER is 0, it means don't handle the errors any more. */ 1682 1683static void 1684set_float_handler (handler) 1685 jmp_buf handler; 1686{ 1687 float_handled = (handler != 0); 1688 if (handler) 1689 memcpy (float_handler, handler, sizeof (float_handler)); 1690 1691 if (float_handled && ! float_handler_set) 1692 { 1693 signal (SIGFPE, float_signal); 1694 float_handler_set = 1; 1695 } 1696} 1697 1698/* This is a wrapper function for code which might elicit an 1699 arithmetic exception. That code should be passed in as a function 1700 pointer FN, and one argument DATA. DATA is usually a struct which 1701 contains the real input and output for function FN. This function 1702 returns 0 (failure) if longjmp was called (i.e. an exception 1703 occurred.) It returns 1 (success) otherwise. */ 1704 1705int 1706do_float_handler (fn, data) 1707 void (*fn) PARAMS ((PTR)); 1708 PTR data; 1709{ 1710 jmp_buf buf; 1711 1712 if (setjmp (buf)) 1713 { 1714 /* We got here via longjmp () caused by an exception in function 1715 fn (). */ 1716 set_float_handler (NULL); 1717 return 0; 1718 } 1719 1720 set_float_handler (buf); 1721 (*fn)(data); 1722 set_float_handler (NULL); 1723 return 1; 1724} 1725 1726/* Handler for fatal signals, such as SIGSEGV. These are transformed 1727 into ICE messages, which is much more user friendly. */ 1728 1729static void 1730crash_signal (signo) 1731 int signo; 1732{ 1733 internal_error ("internal error: %s", strsignal (signo)); 1734} 1735 1736/* Strip off a legitimate source ending from the input string NAME of 1737 length LEN. Rather than having to know the names used by all of 1738 our front ends, we strip off an ending of a period followed by 1739 up to five characters. (Java uses ".class".) */ 1740 1741void 1742strip_off_ending (name, len) 1743 char *name; 1744 int len; 1745{ 1746 int i; 1747 for (i = 2; i < 6 && len > i; i++) 1748 { 1749 if (name[len - i] == '.') 1750 { 1751 name[len - i] = '\0'; 1752 break; 1753 } 1754 } 1755} 1756 1757/* Output a quoted string. */ 1758 1759void 1760output_quoted_string (asm_file, string) 1761 FILE *asm_file; 1762 const char *string; 1763{ 1764#ifdef OUTPUT_QUOTED_STRING 1765 OUTPUT_QUOTED_STRING (asm_file, string); 1766#else 1767 char c; 1768 1769 putc ('\"', asm_file); 1770 while ((c = *string++) != 0) 1771 { 1772 if (c == '\"' || c == '\\') 1773 putc ('\\', asm_file); 1774 putc (c, asm_file); 1775 } 1776 putc ('\"', asm_file); 1777#endif 1778} 1779 1780/* Output a file name in the form wanted by System V. */ 1781 1782void 1783output_file_directive (asm_file, input_name) 1784 FILE *asm_file; 1785 const char *input_name; 1786{ 1787 int len = strlen (input_name); 1788 const char *na = input_name + len; 1789 1790 /* NA gets INPUT_NAME sans directory names. */ 1791 while (na > input_name) 1792 { 1793 if (IS_DIR_SEPARATOR (na[-1])) 1794 break; 1795 na--; 1796 } 1797 1798#ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME 1799 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na); 1800#else 1801#ifdef ASM_OUTPUT_SOURCE_FILENAME 1802 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na); 1803#else 1804 fprintf (asm_file, "\t.file\t"); 1805 output_quoted_string (asm_file, na); 1806 fputc ('\n', asm_file); 1807#endif 1808#endif 1809} 1810 1811/* Routine to open a dump file. Return true if the dump file is enabled. */ 1812 1813static int 1814open_dump_file (index, decl) 1815 enum dump_file_index index; 1816 tree decl; 1817{ 1818 char *dump_name; 1819 const char *open_arg; 1820 char seq[16]; 1821 1822 if (! dump_file[index].enabled) 1823 return 0; 1824 1825 timevar_push (TV_DUMP); 1826 if (rtl_dump_file != NULL) 1827 fclose (rtl_dump_file); 1828 1829 sprintf (seq, DUMPFILE_FORMAT, index); 1830 1831 if (! dump_file[index].initialized) 1832 { 1833 /* If we've not initialized the files, do so now. */ 1834 if (graph_dump_format != no_graph 1835 && dump_file[index].graph_dump_p) 1836 { 1837 dump_name = concat (seq, dump_file[index].extension, NULL); 1838 clean_graph_dump_file (dump_base_name, dump_name); 1839 free (dump_name); 1840 } 1841 dump_file[index].initialized = 1; 1842 open_arg = "w"; 1843 } 1844 else 1845 open_arg = "a"; 1846 1847 dump_name = concat (dump_base_name, seq, 1848 dump_file[index].extension, NULL); 1849 1850 rtl_dump_file = fopen (dump_name, open_arg); 1851 if (rtl_dump_file == NULL) 1852 fatal_io_error ("can't open %s", dump_name); 1853 1854 free (dump_name); 1855 1856 if (decl) 1857 fprintf (rtl_dump_file, "\n;; Function %s\n\n", 1858 decl_printable_name (decl, 2)); 1859 1860 timevar_pop (TV_DUMP); 1861 return 1; 1862} 1863 1864/* Routine to close a dump file. */ 1865 1866static void 1867close_dump_file (index, func, insns) 1868 enum dump_file_index index; 1869 void (*func) PARAMS ((FILE *, rtx)); 1870 rtx insns; 1871{ 1872 if (! rtl_dump_file) 1873 return; 1874 1875 timevar_push (TV_DUMP); 1876 if (insns 1877 && graph_dump_format != no_graph 1878 && dump_file[index].graph_dump_p) 1879 { 1880 char seq[16]; 1881 char *suffix; 1882 1883 sprintf (seq, DUMPFILE_FORMAT, index); 1884 suffix = concat (seq, dump_file[index].extension, NULL); 1885 print_rtl_graph_with_bb (dump_base_name, suffix, insns); 1886 free (suffix); 1887 } 1888 1889 if (func && insns) 1890 func (rtl_dump_file, insns); 1891 1892 fflush (rtl_dump_file); 1893 fclose (rtl_dump_file); 1894 1895 rtl_dump_file = NULL; 1896 timevar_pop (TV_DUMP); 1897} 1898 1899/* Do any final processing required for the declarations in VEC, of 1900 which there are LEN. We write out inline functions and variables 1901 that have been deferred until this point, but which are required. 1902 Returns non-zero if anything was put out. */ 1903 1904int 1905wrapup_global_declarations (vec, len) 1906 tree *vec; 1907 int len; 1908{ 1909 tree decl; 1910 int i; 1911 int reconsider; 1912 int output_something = 0; 1913 1914 for (i = 0; i < len; i++) 1915 { 1916 decl = vec[i]; 1917 1918 /* We're not deferring this any longer. */ 1919 DECL_DEFER_OUTPUT (decl) = 0; 1920 1921 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0 1922 && incomplete_decl_finalize_hook != 0) 1923 (*incomplete_decl_finalize_hook) (decl); 1924 } 1925 1926 /* Now emit any global variables or functions that we have been 1927 putting off. We need to loop in case one of the things emitted 1928 here references another one which comes earlier in the list. */ 1929 do 1930 { 1931 reconsider = 0; 1932 for (i = 0; i < len; i++) 1933 { 1934 decl = vec[i]; 1935 1936 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl)) 1937 continue; 1938 1939 /* Don't write out static consts, unless we still need them. 1940 1941 We also keep static consts if not optimizing (for debugging), 1942 unless the user specified -fno-keep-static-consts. 1943 ??? They might be better written into the debug information. 1944 This is possible when using DWARF. 1945 1946 A language processor that wants static constants to be always 1947 written out (even if it is not used) is responsible for 1948 calling rest_of_decl_compilation itself. E.g. the C front-end 1949 calls rest_of_decl_compilation from finish_decl. 1950 One motivation for this is that is conventional in some 1951 environments to write things like: 1952 static const char rcsid[] = "... version string ..."; 1953 intending to force the string to be in the executable. 1954 1955 A language processor that would prefer to have unneeded 1956 static constants "optimized away" would just defer writing 1957 them out until here. E.g. C++ does this, because static 1958 constants are often defined in header files. 1959 1960 ??? A tempting alternative (for both C and C++) would be 1961 to force a constant to be written if and only if it is 1962 defined in a main file, as opposed to an include file. */ 1963 1964 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl) 1965 && (((! TREE_READONLY (decl) || TREE_PUBLIC (decl)) 1966 && !DECL_COMDAT (decl)) 1967 || (!optimize 1968 && flag_keep_static_consts 1969 && !DECL_ARTIFICIAL (decl)) 1970 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))) 1971 { 1972 reconsider = 1; 1973 rest_of_decl_compilation (decl, NULL, 1, 1); 1974 } 1975 1976 if (TREE_CODE (decl) == FUNCTION_DECL 1977 && DECL_INITIAL (decl) != 0 1978 && DECL_SAVED_INSNS (decl) != 0 1979 && (flag_keep_inline_functions 1980 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl)) 1981 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))) 1982 { 1983 reconsider = 1; 1984 output_inline_function (decl); 1985 } 1986 } 1987 1988 if (reconsider) 1989 output_something = 1; 1990 } 1991 while (reconsider); 1992 1993 return output_something; 1994} 1995 1996/* Issue appropriate warnings for the global declarations in VEC (of 1997 which there are LEN). Output debugging information for them. */ 1998 1999void 2000check_global_declarations (vec, len) 2001 tree *vec; 2002 int len; 2003{ 2004 tree decl; 2005 int i; 2006 2007 for (i = 0; i < len; i++) 2008 { 2009 decl = vec[i]; 2010 2011 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl) 2012 && ! TREE_ASM_WRITTEN (decl)) 2013 /* Cancel the RTL for this decl so that, if debugging info 2014 output for global variables is still to come, 2015 this one will be omitted. */ 2016 SET_DECL_RTL (decl, NULL_RTX); 2017 2018 /* Warn about any function 2019 declared static but not defined. 2020 We don't warn about variables, 2021 because many programs have static variables 2022 that exist only to get some text into the object file. */ 2023 if (TREE_CODE (decl) == FUNCTION_DECL 2024 && (warn_unused_function 2025 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))) 2026 && DECL_INITIAL (decl) == 0 2027 && DECL_EXTERNAL (decl) 2028 && ! DECL_ARTIFICIAL (decl) 2029 && ! TREE_PUBLIC (decl)) 2030 { 2031 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))) 2032 pedwarn_with_decl (decl, 2033 "`%s' used but never defined"); 2034 else 2035 warning_with_decl (decl, 2036 "`%s' declared `static' but never defined"); 2037 /* This symbol is effectively an "extern" declaration now. */ 2038 TREE_PUBLIC (decl) = 1; 2039 assemble_external (decl); 2040 } 2041 2042 /* Warn about static fns or vars defined but not used, 2043 but not about inline functions or static consts 2044 since defining those in header files is normal practice. */ 2045 if (((warn_unused_function 2046 && TREE_CODE (decl) == FUNCTION_DECL && ! DECL_INLINE (decl)) 2047 || (warn_unused_variable 2048 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl))) 2049 && ! DECL_IN_SYSTEM_HEADER (decl) 2050 && ! DECL_EXTERNAL (decl) 2051 && ! TREE_PUBLIC (decl) 2052 && ! TREE_USED (decl) 2053 && (TREE_CODE (decl) == FUNCTION_DECL || ! DECL_REGISTER (decl)) 2054 /* The TREE_USED bit for file-scope decls 2055 is kept in the identifier, to handle multiple 2056 external decls in different scopes. */ 2057 && ! TREE_USED (DECL_NAME (decl))) 2058 warning_with_decl (decl, "`%s' defined but not used"); 2059 2060 timevar_push (TV_SYMOUT); 2061 (*debug_hooks->global_decl) (decl); 2062 timevar_pop (TV_SYMOUT); 2063 } 2064} 2065 2066/* Save the current INPUT_FILENAME and LINENO on the top entry in the 2067 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the 2068 INPUT_FILENAME and LINENO accordingly. */ 2069 2070void 2071push_srcloc (file, line) 2072 const char *file; 2073 int line; 2074{ 2075 struct file_stack *fs; 2076 2077 if (input_file_stack) 2078 { 2079 input_file_stack->name = input_filename; 2080 input_file_stack->line = lineno; 2081 } 2082 2083 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack)); 2084 fs->name = input_filename = file; 2085 fs->line = lineno = line; 2086 fs->indent_level = 0; 2087 fs->next = input_file_stack; 2088 input_file_stack = fs; 2089 input_file_stack_tick++; 2090} 2091 2092/* Pop the top entry off the stack of presently open source files. 2093 Restore the INPUT_FILENAME and LINENO from the new topmost entry on 2094 the stack. */ 2095 2096void 2097pop_srcloc () 2098{ 2099 struct file_stack *fs; 2100 2101 fs = input_file_stack; 2102 input_file_stack = fs->next; 2103 free (fs); 2104 input_file_stack_tick++; 2105 /* The initial source file is never popped. */ 2106 if (!input_file_stack) 2107 abort (); 2108 input_filename = input_file_stack->name; 2109 lineno = input_file_stack->line; 2110} 2111 2112/* Compile an entire translation unit. Write a file of assembly 2113 output and various debugging dumps. */ 2114 2115static void 2116compile_file () 2117{ 2118 tree globals; 2119 2120 /* Initialize yet another pass. */ 2121 2122 init_final (main_input_filename); 2123 init_branch_prob (dump_base_name); 2124 2125 timevar_push (TV_PARSE); 2126 2127 /* Call the parser, which parses the entire file 2128 (calling rest_of_compilation for each function). */ 2129 yyparse (); 2130 2131 /* In case there were missing block closers, 2132 get us back to the global binding level. */ 2133 (*lang_hooks.clear_binding_stack) (); 2134 2135 /* Compilation is now finished except for writing 2136 what's left of the symbol table output. */ 2137 2138 timevar_pop (TV_PARSE); 2139 2140 if (flag_syntax_only) 2141 return; 2142 2143 globals = getdecls (); 2144 2145 /* Really define vars that have had only a tentative definition. 2146 Really output inline functions that must actually be callable 2147 and have not been output so far. */ 2148 2149 { 2150 int len = list_length (globals); 2151 tree *vec = (tree *) xmalloc (sizeof (tree) * len); 2152 int i; 2153 tree decl; 2154 2155 /* Process the decls in reverse order--earliest first. 2156 Put them into VEC from back to front, then take out from front. */ 2157 2158 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl)) 2159 vec[len - i - 1] = decl; 2160 2161 wrapup_global_declarations (vec, len); 2162 2163 /* This must occur after the loop to output deferred functions. Else 2164 the profiler initializer would not be emitted if all the functions 2165 in this compilation unit were deferred. 2166 2167 output_func_start_profiler can not cause any additional functions or 2168 data to need to be output, so it need not be in the deferred function 2169 loop above. */ 2170 output_func_start_profiler (); 2171 2172 check_global_declarations (vec, len); 2173 2174 /* Clean up. */ 2175 free (vec); 2176 } 2177 2178 /* Write out any pending weak symbol declarations. */ 2179 2180 weak_finish (); 2181 2182 /* Do dbx symbols. */ 2183 timevar_push (TV_SYMOUT); 2184 2185#ifdef DWARF2_UNWIND_INFO 2186 if (dwarf2out_do_frame ()) 2187 dwarf2out_frame_finish (); 2188#endif 2189 2190 (*debug_hooks->finish) (main_input_filename); 2191 timevar_pop (TV_SYMOUT); 2192 2193 /* Output some stuff at end of file if nec. */ 2194 2195 dw2_output_indirect_constants (); 2196 2197 end_final (dump_base_name); 2198 2199 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities) 2200 { 2201 timevar_push (TV_DUMP); 2202 open_dump_file (DFI_bp, NULL); 2203 2204 end_branch_prob (); 2205 2206 close_dump_file (DFI_bp, NULL, NULL_RTX); 2207 timevar_pop (TV_DUMP); 2208 } 2209 2210#ifdef ASM_FILE_END 2211 ASM_FILE_END (asm_out_file); 2212#endif 2213 2214 /* Attach a special .ident directive to the end of the file to identify 2215 the version of GCC which compiled this code. The format of the .ident 2216 string is patterned after the ones produced by native SVR4 compilers. */ 2217#ifdef IDENT_ASM_OP 2218 if (!flag_no_ident) 2219 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n", 2220 IDENT_ASM_OP, version_string); 2221#endif 2222 2223 if (optimize > 0 && open_dump_file (DFI_combine, NULL)) 2224 { 2225 timevar_push (TV_DUMP); 2226 dump_combine_total_stats (rtl_dump_file); 2227 close_dump_file (DFI_combine, NULL, NULL_RTX); 2228 timevar_pop (TV_DUMP); 2229 } 2230} 2231 2232/* This is called from various places for FUNCTION_DECL, VAR_DECL, 2233 and TYPE_DECL nodes. 2234 2235 This does nothing for local (non-static) variables, unless the 2236 variable is a register variable with an ASMSPEC. In that case, or 2237 if the variable is not an automatic, it sets up the RTL and 2238 outputs any assembler code (label definition, storage allocation 2239 and initialization). 2240 2241 DECL is the declaration. If ASMSPEC is nonzero, it specifies 2242 the assembler symbol name to be used. TOP_LEVEL is nonzero 2243 if this declaration is not within a function. */ 2244 2245void 2246rest_of_decl_compilation (decl, asmspec, top_level, at_end) 2247 tree decl; 2248 const char *asmspec; 2249 int top_level; 2250 int at_end; 2251{ 2252 /* Declarations of variables, and of functions defined elsewhere. */ 2253 2254/* The most obvious approach, to put an #ifndef around where 2255 this macro is used, doesn't work since it's inside a macro call. */ 2256#ifndef ASM_FINISH_DECLARE_OBJECT 2257#define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END) 2258#endif 2259 2260 /* Forward declarations for nested functions are not "external", 2261 but we need to treat them as if they were. */ 2262 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl) 2263 || TREE_CODE (decl) == FUNCTION_DECL) 2264 { 2265 timevar_push (TV_VARCONST); 2266 if (asmspec) 2267 make_decl_rtl (decl, asmspec); 2268 /* Don't output anything 2269 when a tentative file-scope definition is seen. 2270 But at end of compilation, do output code for them. */ 2271 if (at_end || !DECL_DEFER_OUTPUT (decl)) 2272 assemble_variable (decl, top_level, at_end, 0); 2273 if (decl == last_assemble_variable_decl) 2274 { 2275 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl, 2276 top_level, at_end); 2277 } 2278 timevar_pop (TV_VARCONST); 2279 } 2280 else if (DECL_REGISTER (decl) && asmspec != 0) 2281 { 2282 if (decode_reg_name (asmspec) >= 0) 2283 { 2284 SET_DECL_RTL (decl, NULL_RTX); 2285 make_decl_rtl (decl, asmspec); 2286 } 2287 else 2288 { 2289 error ("invalid register name `%s' for register variable", asmspec); 2290 DECL_REGISTER (decl) = 0; 2291 if (!top_level) 2292 expand_decl (decl); 2293 } 2294 } 2295#if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) 2296 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG) 2297 && TREE_CODE (decl) == TYPE_DECL) 2298 { 2299 timevar_push (TV_SYMOUT); 2300 dbxout_symbol (decl, 0); 2301 timevar_pop (TV_SYMOUT); 2302 } 2303#endif 2304#ifdef SDB_DEBUGGING_INFO 2305 else if (write_symbols == SDB_DEBUG && top_level 2306 && TREE_CODE (decl) == TYPE_DECL) 2307 { 2308 timevar_push (TV_SYMOUT); 2309 sdbout_symbol (decl, 0); 2310 timevar_pop (TV_SYMOUT); 2311 } 2312#endif 2313} 2314 2315/* Called after finishing a record, union or enumeral type. */ 2316 2317void 2318rest_of_type_compilation (type, toplev) 2319#if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO) 2320 tree type; 2321 int toplev; 2322#else 2323 tree type ATTRIBUTE_UNUSED; 2324 int toplev ATTRIBUTE_UNUSED; 2325#endif 2326{ 2327 timevar_push (TV_SYMOUT); 2328#if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) 2329 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG) 2330 dbxout_symbol (TYPE_STUB_DECL (type), !toplev); 2331#endif 2332#ifdef SDB_DEBUGGING_INFO 2333 if (write_symbols == SDB_DEBUG) 2334 sdbout_symbol (TYPE_STUB_DECL (type), !toplev); 2335#endif 2336#ifdef DWARF2_DEBUGGING_INFO 2337 if ((write_symbols == DWARF2_DEBUG 2338 || write_symbols == VMS_AND_DWARF2_DEBUG) 2339 && toplev) 2340 dwarf2out_decl (TYPE_STUB_DECL (type)); 2341#endif 2342 timevar_pop (TV_SYMOUT); 2343} 2344 2345/* This is called from finish_function (within yyparse) 2346 after each top-level definition is parsed. 2347 It is supposed to compile that function or variable 2348 and output the assembler code for it. 2349 After we return, the tree storage is freed. */ 2350 2351void 2352rest_of_compilation (decl) 2353 tree decl; 2354{ 2355 rtx insns; 2356 int tem; 2357 int failure = 0; 2358 int rebuild_label_notes_after_reload; 2359 int register_life_up_to_date; 2360 2361 timevar_push (TV_REST_OF_COMPILATION); 2362 2363 /* Now that we're out of the frontend, we shouldn't have any more 2364 CONCATs anywhere. */ 2365 generating_concat_p = 0; 2366 2367 /* When processing delayed functions, prepare_function_start() won't 2368 have been run to re-initialize it. */ 2369 cse_not_expected = ! optimize; 2370 2371 /* First, make sure that NOTE_BLOCK is set correctly for each 2372 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */ 2373 if (!cfun->x_whole_function_mode_p) 2374 identify_blocks (); 2375 2376 /* In function-at-a-time mode, we do not attempt to keep the BLOCK 2377 tree in sensible shape. So, we just recalculate it here. */ 2378 if (cfun->x_whole_function_mode_p) 2379 reorder_blocks (); 2380 2381 init_flow (); 2382 2383 /* If we are reconsidering an inline function 2384 at the end of compilation, skip the stuff for making it inline. */ 2385 2386 if (DECL_SAVED_INSNS (decl) == 0) 2387 { 2388 int inlinable = 0; 2389 tree parent; 2390 const char *lose; 2391 2392 /* If this is nested inside an inlined external function, pretend 2393 it was only declared. Since we cannot inline such functions, 2394 generating code for this one is not only not necessary but will 2395 confuse some debugging output writers. */ 2396 for (parent = DECL_CONTEXT (current_function_decl); 2397 parent != NULL_TREE; 2398 parent = get_containing_scope (parent)) 2399 if (TREE_CODE (parent) == FUNCTION_DECL 2400 && DECL_INLINE (parent) && DECL_EXTERNAL (parent)) 2401 { 2402 DECL_INITIAL (decl) = 0; 2403 goto exit_rest_of_compilation; 2404 } 2405 2406 /* If requested, consider whether to make this function inline. */ 2407 if ((DECL_INLINE (decl) && !flag_no_inline) 2408 || flag_inline_functions) 2409 { 2410 timevar_push (TV_INTEGRATION); 2411 lose = function_cannot_inline_p (decl); 2412 timevar_pop (TV_INTEGRATION); 2413 if (lose || ! optimize) 2414 { 2415 if (warn_inline && DECL_INLINE (decl)) 2416 warning_with_decl (decl, lose); 2417 DECL_ABSTRACT_ORIGIN (decl) = 0; 2418 /* Don't really compile an extern inline function. 2419 If we can't make it inline, pretend 2420 it was only declared. */ 2421 if (DECL_EXTERNAL (decl)) 2422 { 2423 DECL_INITIAL (decl) = 0; 2424 goto exit_rest_of_compilation; 2425 } 2426 } 2427 else 2428 /* ??? Note that this has the effect of making it look 2429 like "inline" was specified for a function if we choose 2430 to inline it. This isn't quite right, but it's 2431 probably not worth the trouble to fix. */ 2432 inlinable = DECL_INLINE (decl) = 1; 2433 } 2434 2435 insns = get_insns (); 2436 2437 /* Dump the rtl code if we are dumping rtl. */ 2438 2439 if (open_dump_file (DFI_rtl, decl)) 2440 { 2441 if (DECL_SAVED_INSNS (decl)) 2442 fprintf (rtl_dump_file, ";; (integrable)\n\n"); 2443 close_dump_file (DFI_rtl, print_rtl, insns); 2444 } 2445 2446 /* Convert from NOTE_INSN_EH_REGION style notes, and do other 2447 sorts of eh initialization. Delay this until after the 2448 initial rtl dump so that we can see the original nesting. */ 2449 convert_from_eh_region_ranges (); 2450 2451 /* If function is inline, and we don't yet know whether to 2452 compile it by itself, defer decision till end of compilation. 2453 finish_compilation will call rest_of_compilation again 2454 for those functions that need to be output. Also defer those 2455 functions that we are supposed to defer. */ 2456 2457 if (inlinable 2458 || (DECL_INLINE (decl) 2459 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl) 2460 && ! flag_keep_inline_functions) 2461 || DECL_EXTERNAL (decl)))) 2462 DECL_DEFER_OUTPUT (decl) = 1; 2463 2464 if (DECL_INLINE (decl)) 2465 /* DWARF wants separate debugging info for abstract and 2466 concrete instances of all inline functions, including those 2467 declared inline but not inlined, and those inlined even 2468 though they weren't declared inline. Conveniently, that's 2469 what DECL_INLINE means at this point. */ 2470 (*debug_hooks->deferred_inline_function) (decl); 2471 2472 if (DECL_DEFER_OUTPUT (decl)) 2473 { 2474 /* If -Wreturn-type, we have to do a bit of compilation. We just 2475 want to call cleanup the cfg to figure out whether or not we can 2476 fall off the end of the function; we do the minimum amount of 2477 work necessary to make that safe. */ 2478 if (warn_return_type) 2479 { 2480 int saved_optimize = optimize; 2481 2482 optimize = 0; 2483 rebuild_jump_labels (insns); 2484 find_exception_handler_labels (); 2485 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2486 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP); 2487 optimize = saved_optimize; 2488 2489 /* CFG is no longer maintained up-to-date. */ 2490 free_bb_for_insn (); 2491 } 2492 2493 current_function_nothrow = nothrow_function_p (); 2494 if (current_function_nothrow) 2495 /* Now we know that this can't throw; set the flag for the benefit 2496 of other functions later in this translation unit. */ 2497 TREE_NOTHROW (current_function_decl) = 1; 2498 2499 timevar_push (TV_INTEGRATION); 2500 save_for_inline (decl); 2501 timevar_pop (TV_INTEGRATION); 2502 DECL_SAVED_INSNS (decl)->inlinable = inlinable; 2503 goto exit_rest_of_compilation; 2504 } 2505 2506 /* If specified extern inline but we aren't inlining it, we are 2507 done. This goes for anything that gets here with DECL_EXTERNAL 2508 set, not just things with DECL_INLINE. */ 2509 if (DECL_EXTERNAL (decl)) 2510 goto exit_rest_of_compilation; 2511 } 2512 2513 /* If we're emitting a nested function, make sure its parent gets 2514 emitted as well. Doing otherwise confuses debug info. */ 2515 { 2516 tree parent; 2517 for (parent = DECL_CONTEXT (current_function_decl); 2518 parent != NULL_TREE; 2519 parent = get_containing_scope (parent)) 2520 if (TREE_CODE (parent) == FUNCTION_DECL) 2521 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1; 2522 } 2523 2524 /* We are now committed to emitting code for this function. Do any 2525 preparation, such as emitting abstract debug info for the inline 2526 before it gets mangled by optimization. */ 2527 if (DECL_INLINE (decl)) 2528 (*debug_hooks->outlining_inline_function) (decl); 2529 2530 /* Remove any notes we don't need. That will make iterating 2531 over the instruction sequence faster, and allow the garbage 2532 collector to reclaim the memory used by the notes. */ 2533 remove_unnecessary_notes (); 2534 reorder_blocks (); 2535 2536 ggc_collect (); 2537 2538 /* Initialize some variables used by the optimizers. */ 2539 init_function_for_compilation (); 2540 2541 if (! DECL_DEFER_OUTPUT (decl)) 2542 TREE_ASM_WRITTEN (decl) = 1; 2543 2544 /* Now that integrate will no longer see our rtl, we need not 2545 distinguish between the return value of this function and the 2546 return value of called functions. Also, we can remove all SETs 2547 of subregs of hard registers; they are only here because of 2548 integrate. Also, we can now initialize pseudos intended to 2549 carry magic hard reg data throughout the function. */ 2550 rtx_equal_function_value_matters = 0; 2551 purge_hard_subreg_sets (get_insns ()); 2552 emit_initial_value_sets (); 2553 2554 /* Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */ 2555 if ((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type) 2556 goto exit_rest_of_compilation; 2557 2558 /* We may have potential sibling or tail recursion sites. Select one 2559 (of possibly multiple) methods of performing the call. */ 2560 if (flag_optimize_sibling_calls) 2561 { 2562 timevar_push (TV_JUMP); 2563 open_dump_file (DFI_sibling, decl); 2564 2565 optimize_sibling_and_tail_recursive_calls (); 2566 2567 close_dump_file (DFI_sibling, print_rtl, get_insns ()); 2568 timevar_pop (TV_JUMP); 2569 } 2570 2571 /* Complete generation of exception handling code. */ 2572 find_exception_handler_labels (); 2573 if (doing_eh (0)) 2574 { 2575 timevar_push (TV_JUMP); 2576 open_dump_file (DFI_eh, decl); 2577 2578 finish_eh_generation (); 2579 2580 close_dump_file (DFI_eh, print_rtl, get_insns ()); 2581 timevar_pop (TV_JUMP); 2582 } 2583 2584#ifdef FINALIZE_PIC 2585 /* If we are doing position-independent code generation, now 2586 is the time to output special prologues and epilogues. 2587 We do not want to do this earlier, because it just clutters 2588 up inline functions with meaningless insns. */ 2589 if (flag_pic) 2590 FINALIZE_PIC; 2591#endif 2592 2593 insns = get_insns (); 2594 2595 /* Copy any shared structure that should not be shared. */ 2596 unshare_all_rtl (current_function_decl, insns); 2597 2598#ifdef SETJMP_VIA_SAVE_AREA 2599 /* This must be performed before virtual register instantiation. */ 2600 if (current_function_calls_alloca) 2601 optimize_save_area_alloca (insns); 2602#endif 2603 2604 /* Instantiate all virtual registers. */ 2605 instantiate_virtual_regs (current_function_decl, insns); 2606 2607 open_dump_file (DFI_jump, decl); 2608 2609 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields 2610 are initialized and to compute whether control can drop off the end 2611 of the function. */ 2612 2613 timevar_push (TV_JUMP); 2614 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this 2615 before jump optimization switches branch directions. */ 2616 expected_value_to_br_prob (); 2617 2618 reg_scan (insns, max_reg_num (), 0); 2619 rebuild_jump_labels (insns); 2620 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2621 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP); 2622 2623 /* CFG is no longer maintained up-to-date. */ 2624 free_bb_for_insn (); 2625 copy_loop_headers (insns); 2626 purge_line_number_notes (insns); 2627 2628 timevar_pop (TV_JUMP); 2629 2630 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */ 2631 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl)) 2632 { 2633 close_dump_file (DFI_jump, print_rtl, insns); 2634 goto exit_rest_of_compilation; 2635 } 2636 2637 /* Long term, this should probably move before the jump optimizer too, 2638 but I didn't want to disturb the rtl_dump_and_exit and related 2639 stuff at this time. */ 2640 if (optimize > 0 && flag_ssa) 2641 { 2642 /* Convert to SSA form. */ 2643 2644 timevar_push (TV_TO_SSA); 2645 open_dump_file (DFI_ssa, decl); 2646 2647 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2648 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP); 2649 convert_to_ssa (); 2650 2651 close_dump_file (DFI_ssa, print_rtl_with_bb, insns); 2652 timevar_pop (TV_TO_SSA); 2653 2654 /* Perform sparse conditional constant propagation, if requested. */ 2655 if (flag_ssa_ccp) 2656 { 2657 timevar_push (TV_SSA_CCP); 2658 open_dump_file (DFI_ssa_ccp, decl); 2659 2660 ssa_const_prop (); 2661 2662 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ()); 2663 timevar_pop (TV_SSA_CCP); 2664 } 2665 2666 /* It would be useful to cleanup the CFG at this point, but block 2667 merging and possibly other transformations might leave a PHI 2668 node in the middle of a basic block, which is a strict no-no. */ 2669 2670 /* The SSA implementation uses basic block numbers in its phi 2671 nodes. Thus, changing the control-flow graph or the basic 2672 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (), 2673 may cause problems. */ 2674 2675 if (flag_ssa_dce) 2676 { 2677 /* Remove dead code. */ 2678 2679 timevar_push (TV_SSA_DCE); 2680 open_dump_file (DFI_ssa_dce, decl); 2681 2682 insns = get_insns (); 2683 ssa_eliminate_dead_code(); 2684 2685 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns); 2686 timevar_pop (TV_SSA_DCE); 2687 } 2688 2689 /* Convert from SSA form. */ 2690 2691 timevar_push (TV_FROM_SSA); 2692 open_dump_file (DFI_ussa, decl); 2693 2694 convert_from_ssa (); 2695 /* New registers have been created. Rescan their usage. */ 2696 reg_scan (insns, max_reg_num (), 1); 2697 2698 close_dump_file (DFI_ussa, print_rtl_with_bb, insns); 2699 timevar_pop (TV_FROM_SSA); 2700 2701 ggc_collect (); 2702 /* CFG is no longer maintained up-to-date. */ 2703 free_bb_for_insn (); 2704 } 2705 2706 timevar_push (TV_JUMP); 2707 2708 if (optimize > 0) 2709 { 2710 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2711 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP 2712 | (flag_thread_jumps ? CLEANUP_THREADING : 0)); 2713 2714 /* ??? Run if-conversion before delete_null_pointer_checks, 2715 since the later does not preserve the CFG. This should 2716 be changed -- no since converting if's that are going to 2717 be deleted. */ 2718 timevar_push (TV_IFCVT); 2719 if_convert (0); 2720 timevar_pop (TV_IFCVT); 2721 2722 /* CFG is no longer maintained up-to-date. */ 2723 free_bb_for_insn (); 2724 /* Try to identify useless null pointer tests and delete them. */ 2725 if (flag_delete_null_pointer_checks) 2726 delete_null_pointer_checks (insns); 2727 } 2728 2729 /* Jump optimization, and the removal of NULL pointer checks, may 2730 have reduced the number of instructions substantially. CSE, and 2731 future passes, allocate arrays whose dimensions involve the 2732 maximum instruction UID, so if we can reduce the maximum UID 2733 we'll save big on memory. */ 2734 renumber_insns (rtl_dump_file); 2735 timevar_pop (TV_JUMP); 2736 2737 close_dump_file (DFI_jump, print_rtl, insns); 2738 2739 ggc_collect (); 2740 2741 /* Perform common subexpression elimination. 2742 Nonzero value from `cse_main' means that jumps were simplified 2743 and some code may now be unreachable, so do 2744 jump optimization again. */ 2745 2746 if (optimize > 0) 2747 { 2748 open_dump_file (DFI_cse, decl); 2749 timevar_push (TV_CSE); 2750 2751 reg_scan (insns, max_reg_num (), 1); 2752 2753 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file); 2754 2755 /* If we are not running more CSE passes, then we are no longer 2756 expecting CSE to be run. But always rerun it in a cheap mode. */ 2757 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse; 2758 2759 if (tem || optimize > 1) 2760 { 2761 timevar_push (TV_JUMP); 2762 rebuild_jump_labels (insns); 2763 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2764 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP); 2765 timevar_pop (TV_JUMP); 2766 /* CFG is no longer maintained up-to-date. */ 2767 free_bb_for_insn (); 2768 } 2769 2770 /* Run this after jump optmizations remove all the unreachable code 2771 so that unreachable code will not keep values live. */ 2772 delete_trivially_dead_insns (insns, max_reg_num (), 0); 2773 2774 /* Try to identify useless null pointer tests and delete them. */ 2775 if (flag_delete_null_pointer_checks || flag_thread_jumps) 2776 { 2777 timevar_push (TV_JUMP); 2778 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2779 2780 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP 2781 | (flag_thread_jumps ? CLEANUP_THREADING : 0)); 2782 2783 if (flag_delete_null_pointer_checks) 2784 delete_null_pointer_checks (insns); 2785 /* CFG is no longer maintained up-to-date. */ 2786 free_bb_for_insn (); 2787 timevar_pop (TV_JUMP); 2788 } 2789 2790 /* The second pass of jump optimization is likely to have 2791 removed a bunch more instructions. */ 2792 renumber_insns (rtl_dump_file); 2793 2794 timevar_pop (TV_CSE); 2795 close_dump_file (DFI_cse, print_rtl, insns); 2796 } 2797 2798 open_dump_file (DFI_addressof, decl); 2799 2800 purge_addressof (insns); 2801 reg_scan (insns, max_reg_num (), 1); 2802 2803 close_dump_file (DFI_addressof, print_rtl, insns); 2804 2805 ggc_collect (); 2806 2807 /* Perform global cse. */ 2808 2809 if (optimize > 0 && flag_gcse) 2810 { 2811 int save_csb, save_cfj; 2812 int tem2 = 0; 2813 2814 timevar_push (TV_GCSE); 2815 open_dump_file (DFI_gcse, decl); 2816 2817 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2818 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP); 2819 tem = gcse_main (insns, rtl_dump_file); 2820 rebuild_jump_labels (insns); 2821 2822 save_csb = flag_cse_skip_blocks; 2823 save_cfj = flag_cse_follow_jumps; 2824 flag_cse_skip_blocks = flag_cse_follow_jumps = 0; 2825 2826 /* CFG is no longer maintained up-to-date. */ 2827 free_bb_for_insn (); 2828 /* If -fexpensive-optimizations, re-run CSE to clean up things done 2829 by gcse. */ 2830 if (flag_expensive_optimizations) 2831 { 2832 timevar_push (TV_CSE); 2833 reg_scan (insns, max_reg_num (), 1); 2834 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file); 2835 timevar_pop (TV_CSE); 2836 cse_not_expected = !flag_rerun_cse_after_loop; 2837 } 2838 2839 /* If gcse or cse altered any jumps, rerun jump optimizations to clean 2840 things up. Then possibly re-run CSE again. */ 2841 while (tem || tem2) 2842 { 2843 tem = tem2 = 0; 2844 timevar_push (TV_JUMP); 2845 rebuild_jump_labels (insns); 2846 delete_trivially_dead_insns (insns, max_reg_num (), 0); 2847 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2848 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP); 2849 /* CFG is no longer maintained up-to-date. */ 2850 free_bb_for_insn (); 2851 timevar_pop (TV_JUMP); 2852 2853 if (flag_expensive_optimizations) 2854 { 2855 timevar_push (TV_CSE); 2856 reg_scan (insns, max_reg_num (), 1); 2857 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file); 2858 timevar_pop (TV_CSE); 2859 } 2860 } 2861 2862 close_dump_file (DFI_gcse, print_rtl, insns); 2863 timevar_pop (TV_GCSE); 2864 2865 ggc_collect (); 2866 flag_cse_skip_blocks = save_csb; 2867 flag_cse_follow_jumps = save_cfj; 2868 } 2869 2870 /* Move constant computations out of loops. */ 2871 2872 if (optimize > 0) 2873 { 2874 timevar_push (TV_LOOP); 2875 open_dump_file (DFI_loop, decl); 2876 free_bb_for_insn (); 2877 2878 if (flag_rerun_loop_opt) 2879 { 2880 cleanup_barriers (); 2881 2882 /* We only want to perform unrolling once. */ 2883 2884 loop_optimize (insns, rtl_dump_file, 0); 2885 2886 /* The first call to loop_optimize makes some instructions 2887 trivially dead. We delete those instructions now in the 2888 hope that doing so will make the heuristics in loop work 2889 better and possibly speed up compilation. */ 2890 delete_trivially_dead_insns (insns, max_reg_num (), 0); 2891 2892 /* The regscan pass is currently necessary as the alias 2893 analysis code depends on this information. */ 2894 reg_scan (insns, max_reg_num (), 1); 2895 } 2896 cleanup_barriers (); 2897 loop_optimize (insns, rtl_dump_file, 2898 (flag_unroll_loops ? LOOP_UNROLL : 0) | LOOP_BCT 2899 | (flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0)); 2900 2901 close_dump_file (DFI_loop, print_rtl, insns); 2902 timevar_pop (TV_LOOP); 2903 2904 ggc_collect (); 2905 } 2906 2907 if (optimize > 0) 2908 { 2909 timevar_push (TV_CSE2); 2910 open_dump_file (DFI_cse2, decl); 2911 2912 if (flag_rerun_cse_after_loop) 2913 { 2914 /* Running another jump optimization pass before the second 2915 cse pass sometimes simplifies the RTL enough to allow 2916 the second CSE pass to do a better job. Jump_optimize can change 2917 max_reg_num so we must rerun reg_scan afterwards. 2918 ??? Rework to not call reg_scan so often. */ 2919 timevar_push (TV_JUMP); 2920 2921 /* The previous call to loop_optimize makes some instructions 2922 trivially dead. We delete those instructions now in the 2923 hope that doing so will make the heuristics in jump work 2924 better and possibly speed up compilation. */ 2925 delete_trivially_dead_insns (insns, max_reg_num (), 0); 2926 2927 reg_scan (insns, max_reg_num (), 0); 2928 2929 timevar_push (TV_IFCVT); 2930 2931 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2932 cleanup_cfg (CLEANUP_EXPENSIVE); 2933 if_convert (0); 2934 2935 timevar_pop(TV_IFCVT); 2936 2937 timevar_pop (TV_JUMP); 2938 2939 /* CFG is no longer maintained up-to-date. */ 2940 free_bb_for_insn (); 2941 reg_scan (insns, max_reg_num (), 0); 2942 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file); 2943 2944 if (tem) 2945 { 2946 timevar_push (TV_JUMP); 2947 rebuild_jump_labels (insns); 2948 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2949 cleanup_cfg (CLEANUP_EXPENSIVE); 2950 /* CFG is no longer maintained up-to-date. */ 2951 free_bb_for_insn (); 2952 timevar_pop (TV_JUMP); 2953 } 2954 } 2955 2956 close_dump_file (DFI_cse2, print_rtl, insns); 2957 timevar_pop (TV_CSE2); 2958 2959 ggc_collect (); 2960 } 2961 2962 cse_not_expected = 1; 2963 2964 regclass_init (); 2965 2966 /* Do control and data flow analysis; wrote some of the results to 2967 the dump file. */ 2968 2969 timevar_push (TV_FLOW); 2970 open_dump_file (DFI_cfg, decl); 2971 2972 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2973 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) 2974 | (flag_thread_jumps ? CLEANUP_THREADING : 0)); 2975 check_function_return_warnings (); 2976 2977 /* It may make more sense to mark constant functions after dead code is 2978 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs 2979 may insert code making function non-constant, but we still must consider 2980 it as constant, otherwise -fbranch-probabilities will not read data back. 2981 2982 life_analyzis rarely eliminates modification of external memory. 2983 */ 2984 mark_constant_function (); 2985 2986 close_dump_file (DFI_cfg, print_rtl_with_bb, insns); 2987 2988 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities) 2989 { 2990 timevar_push (TV_BRANCH_PROB); 2991 open_dump_file (DFI_bp, decl); 2992 2993 branch_prob (); 2994 2995 close_dump_file (DFI_bp, print_rtl_with_bb, insns); 2996 timevar_pop (TV_BRANCH_PROB); 2997 } 2998 2999 open_dump_file (DFI_life, decl); 3000 if (optimize) 3001 { 3002 struct loops loops; 3003 3004 /* Discover and record the loop depth at the head of each basic 3005 block. The loop infrastructure does the real job for us. */ 3006 flow_loops_find (&loops, LOOP_TREE); 3007 3008 /* Estimate using heuristics if no profiling info is available. */ 3009 if (flag_guess_branch_prob) 3010 estimate_probability (&loops); 3011 3012 if (rtl_dump_file) 3013 flow_loops_dump (&loops, rtl_dump_file, NULL, 0); 3014 3015 flow_loops_free (&loops); 3016 } 3017 life_analysis (insns, rtl_dump_file, PROP_FINAL); 3018 timevar_pop (TV_FLOW); 3019 3020 no_new_pseudos = 1; 3021 3022 if (warn_uninitialized || extra_warnings) 3023 { 3024 uninitialized_vars_warning (DECL_INITIAL (decl)); 3025 if (extra_warnings) 3026 setjmp_args_warning (); 3027 } 3028 3029 if (optimize) 3030 { 3031 if (initialize_uninitialized_subregs ()) 3032 { 3033 /* Insns were inserted, so things might look a bit different. */ 3034 insns = get_insns (); 3035 life_analysis (insns, rtl_dump_file, 3036 (PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES)); 3037 } 3038 } 3039 3040 close_dump_file (DFI_life, print_rtl_with_bb, insns); 3041 3042 ggc_collect (); 3043 3044 /* If -opt, try combining insns through substitution. */ 3045 3046 if (optimize > 0) 3047 { 3048 int rebuild_jump_labels_after_combine = 0; 3049 3050 timevar_push (TV_COMBINE); 3051 open_dump_file (DFI_combine, decl); 3052 3053 rebuild_jump_labels_after_combine 3054 = combine_instructions (insns, max_reg_num ()); 3055 3056 /* Always purge dead edges, as we may eliminate an insn throwing 3057 exception. */ 3058 rebuild_jump_labels_after_combine |= purge_all_dead_edges (true); 3059 3060 /* Combining insns may have turned an indirect jump into a 3061 direct jump. Rebuid the JUMP_LABEL fields of jumping 3062 instructions. */ 3063 if (rebuild_jump_labels_after_combine) 3064 { 3065 timevar_push (TV_JUMP); 3066 rebuild_jump_labels (insns); 3067 timevar_pop (TV_JUMP); 3068 3069 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE); 3070 } 3071 3072 close_dump_file (DFI_combine, print_rtl_with_bb, insns); 3073 timevar_pop (TV_COMBINE); 3074 3075 ggc_collect (); 3076 } 3077 3078 /* Rerun if-conversion, as combine may have simplified things enough to 3079 now meet sequence length restrictions. */ 3080 if (optimize > 0) 3081 { 3082 timevar_push (TV_IFCVT); 3083 open_dump_file (DFI_ce, decl); 3084 3085 no_new_pseudos = 0; 3086 if_convert (1); 3087 no_new_pseudos = 1; 3088 3089 close_dump_file (DFI_ce, print_rtl_with_bb, insns); 3090 timevar_pop (TV_IFCVT); 3091 } 3092 3093 /* Register allocation pre-pass, to reduce number of moves 3094 necessary for two-address machines. */ 3095 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations)) 3096 { 3097 timevar_push (TV_REGMOVE); 3098 open_dump_file (DFI_regmove, decl); 3099 3100 regmove_optimize (insns, max_reg_num (), rtl_dump_file); 3101 3102 close_dump_file (DFI_regmove, print_rtl_with_bb, insns); 3103 timevar_pop (TV_REGMOVE); 3104 3105 ggc_collect (); 3106 } 3107 3108 /* Do unconditional splitting before register allocation to allow machine 3109 description to add extra information not needed previously. */ 3110 split_all_insns (1); 3111 3112 /* Any of the several passes since flow1 will have munged register 3113 lifetime data a bit. */ 3114 register_life_up_to_date = 0; 3115 3116#ifdef OPTIMIZE_MODE_SWITCHING 3117 timevar_push (TV_MODE_SWITCH); 3118 3119 no_new_pseudos = 0; 3120 if (optimize_mode_switching (NULL)) 3121 { 3122 /* We did work, and so had to regenerate global life information. 3123 Take advantage of this and don't re-recompute register life 3124 information below. */ 3125 register_life_up_to_date = 1; 3126 } 3127 no_new_pseudos = 1; 3128 3129 timevar_pop (TV_MODE_SWITCH); 3130#endif 3131 3132 timevar_push (TV_SCHED); 3133 3134#ifdef INSN_SCHEDULING 3135 3136 /* Print function header into sched dump now 3137 because doing the sched analysis makes some of the dump. */ 3138 if (optimize > 0 && flag_schedule_insns) 3139 { 3140 open_dump_file (DFI_sched, decl); 3141 3142 /* Do control and data sched analysis, 3143 and write some of the results to dump file. */ 3144 3145 schedule_insns (rtl_dump_file); 3146 3147 close_dump_file (DFI_sched, print_rtl_with_bb, insns); 3148 3149 /* Register lifetime information was updated as part of verifying 3150 the schedule. */ 3151 register_life_up_to_date = 1; 3152 } 3153#endif 3154 timevar_pop (TV_SCHED); 3155 3156 ggc_collect (); 3157 3158 /* Determine if the current function is a leaf before running reload 3159 since this can impact optimizations done by the prologue and 3160 epilogue thus changing register elimination offsets. */ 3161 current_function_is_leaf = leaf_function_p (); 3162 3163 timevar_push (TV_LOCAL_ALLOC); 3164 open_dump_file (DFI_lreg, decl); 3165 3166 /* Allocate pseudo-regs that are used only within 1 basic block. 3167 3168 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the 3169 jump optimizer after register allocation and reloading are finished. */ 3170 3171 if (! register_life_up_to_date) 3172 recompute_reg_usage (insns, ! optimize_size); 3173 3174 /* Allocate the reg_renumber array. */ 3175 allocate_reg_info (max_regno, FALSE, TRUE); 3176 3177 /* And the reg_equiv_memory_loc array. */ 3178 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx)); 3179 3180 allocate_initial_values (reg_equiv_memory_loc); 3181 3182 regclass (insns, max_reg_num (), rtl_dump_file); 3183 rebuild_label_notes_after_reload = local_alloc (); 3184 3185 timevar_pop (TV_LOCAL_ALLOC); 3186 3187 if (dump_file[DFI_lreg].enabled) 3188 { 3189 timevar_push (TV_DUMP); 3190 3191 dump_flow_info (rtl_dump_file); 3192 dump_local_alloc (rtl_dump_file); 3193 3194 close_dump_file (DFI_lreg, print_rtl_with_bb, insns); 3195 timevar_pop (TV_DUMP); 3196 } 3197 3198 ggc_collect (); 3199 3200 timevar_push (TV_GLOBAL_ALLOC); 3201 open_dump_file (DFI_greg, decl); 3202 3203 /* If optimizing, allocate remaining pseudo-regs. Do the reload 3204 pass fixing up any insns that are invalid. */ 3205 3206 if (optimize) 3207 failure = global_alloc (rtl_dump_file); 3208 else 3209 { 3210 build_insn_chain (insns); 3211 failure = reload (insns, 0); 3212 } 3213 3214 timevar_pop (TV_GLOBAL_ALLOC); 3215 3216 if (dump_file[DFI_greg].enabled) 3217 { 3218 timevar_push (TV_DUMP); 3219 3220 dump_global_regs (rtl_dump_file); 3221 3222 close_dump_file (DFI_greg, print_rtl_with_bb, insns); 3223 timevar_pop (TV_DUMP); 3224 } 3225 3226 if (failure) 3227 goto exit_rest_of_compilation; 3228 3229 ggc_collect (); 3230 3231 open_dump_file (DFI_postreload, decl); 3232 3233 /* Do a very simple CSE pass over just the hard registers. */ 3234 if (optimize > 0) 3235 { 3236 timevar_push (TV_RELOAD_CSE_REGS); 3237 reload_cse_regs (insns); 3238 timevar_pop (TV_RELOAD_CSE_REGS); 3239 } 3240 3241 /* Register allocation and reloading may have turned an indirect jump into 3242 a direct jump. If so, we must rebuild the JUMP_LABEL fields of 3243 jumping instructions. */ 3244 if (rebuild_label_notes_after_reload) 3245 { 3246 timevar_push (TV_JUMP); 3247 3248 rebuild_jump_labels (insns); 3249 3250 timevar_pop (TV_JUMP); 3251 } 3252 3253 close_dump_file (DFI_postreload, print_rtl_with_bb, insns); 3254 3255 /* Re-create the death notes which were deleted during reload. */ 3256 timevar_push (TV_FLOW2); 3257 open_dump_file (DFI_flow2, decl); 3258 3259#ifdef ENABLE_CHECKING 3260 verify_flow_info (); 3261#endif 3262 3263 /* If optimizing, then go ahead and split insns now. */ 3264 if (optimize > 0) 3265 split_all_insns (0); 3266 3267 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0); 3268 3269 /* On some machines, the prologue and epilogue code, or parts thereof, 3270 can be represented as RTL. Doing so lets us schedule insns between 3271 it and the rest of the code and also allows delayed branch 3272 scheduling to operate in the epilogue. */ 3273 thread_prologue_and_epilogue_insns (insns); 3274 3275 if (optimize) 3276 { 3277 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_CROSSJUMP); 3278 life_analysis (insns, rtl_dump_file, PROP_FINAL); 3279 3280 /* This is kind of a heuristic. We need to run combine_stack_adjustments 3281 even for machines with possibly nonzero RETURN_POPS_ARGS 3282 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having 3283 push instructions will have popping returns. */ 3284#ifndef PUSH_ROUNDING 3285 if (!ACCUMULATE_OUTGOING_ARGS) 3286#endif 3287 combine_stack_adjustments (); 3288 3289 ggc_collect (); 3290 } 3291 3292 flow2_completed = 1; 3293 3294 close_dump_file (DFI_flow2, print_rtl_with_bb, insns); 3295 timevar_pop (TV_FLOW2); 3296 3297#ifdef HAVE_peephole2 3298 if (optimize > 0 && flag_peephole2) 3299 { 3300 timevar_push (TV_PEEPHOLE2); 3301 open_dump_file (DFI_peephole2, decl); 3302 3303 peephole2_optimize (rtl_dump_file); 3304 3305 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns); 3306 timevar_pop (TV_PEEPHOLE2); 3307 } 3308#endif 3309 3310 if (flag_rename_registers || flag_cprop_registers) 3311 { 3312 timevar_push (TV_RENAME_REGISTERS); 3313 open_dump_file (DFI_rnreg, decl); 3314 3315 if (flag_rename_registers) 3316 regrename_optimize (); 3317 if (flag_cprop_registers) 3318 copyprop_hardreg_forward (); 3319 3320 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns); 3321 timevar_pop (TV_RENAME_REGISTERS); 3322 } 3323 3324 if (optimize > 0) 3325 { 3326 timevar_push (TV_IFCVT2); 3327 open_dump_file (DFI_ce2, decl); 3328 3329 if_convert (1); 3330 3331 close_dump_file (DFI_ce2, print_rtl_with_bb, insns); 3332 timevar_pop (TV_IFCVT2); 3333 } 3334#ifdef STACK_REGS 3335 if (optimize) 3336 split_all_insns (1); 3337#endif 3338 3339#ifdef INSN_SCHEDULING 3340 if (optimize > 0 && flag_schedule_insns_after_reload) 3341 { 3342 timevar_push (TV_SCHED2); 3343 open_dump_file (DFI_sched2, decl); 3344 3345 /* Do control and data sched analysis again, 3346 and write some more of the results to dump file. */ 3347 3348 split_all_insns (1); 3349 3350 schedule_insns (rtl_dump_file); 3351 3352 close_dump_file (DFI_sched2, print_rtl_with_bb, insns); 3353 timevar_pop (TV_SCHED2); 3354 3355 ggc_collect (); 3356 } 3357#endif 3358 3359#ifdef LEAF_REGISTERS 3360 current_function_uses_only_leaf_regs 3361 = optimize > 0 && only_leaf_regs_used () && leaf_function_p (); 3362#endif 3363 3364#ifdef STACK_REGS 3365 timevar_push (TV_REG_STACK); 3366 open_dump_file (DFI_stack, decl); 3367 3368 reg_to_stack (insns, rtl_dump_file); 3369 3370 close_dump_file (DFI_stack, print_rtl_with_bb, insns); 3371 timevar_pop (TV_REG_STACK); 3372 3373 ggc_collect (); 3374#endif 3375 if (optimize > 0) 3376 { 3377 timevar_push (TV_REORDER_BLOCKS); 3378 open_dump_file (DFI_bbro, decl); 3379 3380 /* Last attempt to optimize CFG, as life analyzis possibly removed 3381 some instructions. */ 3382 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK 3383 | CLEANUP_CROSSJUMP); 3384 if (flag_reorder_blocks) 3385 { 3386 reorder_basic_blocks (); 3387 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK); 3388 } 3389 3390 close_dump_file (DFI_bbro, print_rtl_with_bb, insns); 3391 timevar_pop (TV_REORDER_BLOCKS); 3392 } 3393 compute_alignments (); 3394 3395 /* CFG is no longer maintained up-to-date. */ 3396 free_bb_for_insn (); 3397 3398 /* If a machine dependent reorganization is needed, call it. */ 3399#ifdef MACHINE_DEPENDENT_REORG 3400 timevar_push (TV_MACH_DEP); 3401 open_dump_file (DFI_mach, decl); 3402 3403 MACHINE_DEPENDENT_REORG (insns); 3404 3405 close_dump_file (DFI_mach, print_rtl, insns); 3406 timevar_pop (TV_MACH_DEP); 3407 3408 ggc_collect (); 3409#endif 3410 3411 purge_line_number_notes (insns); 3412 cleanup_barriers (); 3413 3414 /* If a scheduling pass for delayed branches is to be done, 3415 call the scheduling code. */ 3416 3417#ifdef DELAY_SLOTS 3418 if (optimize > 0 && flag_delayed_branch) 3419 { 3420 timevar_push (TV_DBR_SCHED); 3421 open_dump_file (DFI_dbr, decl); 3422 3423 dbr_schedule (insns, rtl_dump_file); 3424 3425 close_dump_file (DFI_dbr, print_rtl, insns); 3426 timevar_pop (TV_DBR_SCHED); 3427 3428 ggc_collect (); 3429 } 3430#endif 3431 3432#if defined (HAVE_ATTR_length) && !defined (STACK_REGS) 3433 timevar_push (TV_SHORTEN_BRANCH); 3434 split_all_insns_noflow (); 3435 timevar_pop (TV_SHORTEN_BRANCH); 3436#endif 3437 3438 convert_to_eh_region_ranges (); 3439 3440 /* Shorten branches. */ 3441 timevar_push (TV_SHORTEN_BRANCH); 3442 shorten_branches (get_insns ()); 3443 timevar_pop (TV_SHORTEN_BRANCH); 3444 3445 current_function_nothrow = nothrow_function_p (); 3446 if (current_function_nothrow) 3447 /* Now we know that this can't throw; set the flag for the benefit 3448 of other functions later in this translation unit. */ 3449 TREE_NOTHROW (current_function_decl) = 1; 3450 3451 /* Now turn the rtl into assembler code. */ 3452 3453 timevar_push (TV_FINAL); 3454 { 3455 rtx x; 3456 const char *fnname; 3457 3458 /* Get the function's name, as described by its RTL. This may be 3459 different from the DECL_NAME name used in the source file. */ 3460 3461 x = DECL_RTL (decl); 3462 if (GET_CODE (x) != MEM) 3463 abort (); 3464 x = XEXP (x, 0); 3465 if (GET_CODE (x) != SYMBOL_REF) 3466 abort (); 3467 fnname = XSTR (x, 0); 3468 3469 assemble_start_function (decl, fnname); 3470 final_start_function (insns, asm_out_file, optimize); 3471 final (insns, asm_out_file, optimize, 0); 3472 final_end_function (); 3473 3474#ifdef IA64_UNWIND_INFO 3475 /* ??? The IA-64 ".handlerdata" directive must be issued before 3476 the ".endp" directive that closes the procedure descriptor. */ 3477 output_function_exception_table (); 3478#endif 3479 3480 assemble_end_function (decl, fnname); 3481 3482#ifndef IA64_UNWIND_INFO 3483 /* Otherwise, it feels unclean to switch sections in the middle. */ 3484 output_function_exception_table (); 3485#endif 3486 3487 if (! quiet_flag) 3488 fflush (asm_out_file); 3489 3490 /* Release all memory allocated by flow. */ 3491 free_basic_block_vars (0); 3492 3493 /* Release all memory held by regsets now. */ 3494 regset_release_memory (); 3495 } 3496 timevar_pop (TV_FINAL); 3497 3498 ggc_collect (); 3499 3500 /* Write DBX symbols if requested. */ 3501 3502 /* Note that for those inline functions where we don't initially 3503 know for certain that we will be generating an out-of-line copy, 3504 the first invocation of this routine (rest_of_compilation) will 3505 skip over this code by doing a `goto exit_rest_of_compilation;'. 3506 Later on, finish_compilation will call rest_of_compilation again 3507 for those inline functions that need to have out-of-line copies 3508 generated. During that call, we *will* be routed past here. */ 3509 3510 timevar_push (TV_SYMOUT); 3511 (*debug_hooks->function_decl) (decl); 3512 timevar_pop (TV_SYMOUT); 3513 3514 exit_rest_of_compilation: 3515 3516 /* In case the function was not output, 3517 don't leave any temporary anonymous types 3518 queued up for sdb output. */ 3519#ifdef SDB_DEBUGGING_INFO 3520 if (write_symbols == SDB_DEBUG) 3521 sdbout_types (NULL_TREE); 3522#endif 3523 3524 reload_completed = 0; 3525 flow2_completed = 0; 3526 no_new_pseudos = 0; 3527 3528 timevar_push (TV_FINAL); 3529 3530 /* Clear out the insn_length contents now that they are no 3531 longer valid. */ 3532 init_insn_lengths (); 3533 3534 /* Clear out the real_constant_chain before some of the rtx's 3535 it runs through become garbage. */ 3536 clear_const_double_mem (); 3537 3538 /* Show no temporary slots allocated. */ 3539 init_temp_slots (); 3540 3541 free_basic_block_vars (0); 3542 free_bb_for_insn (); 3543 3544 timevar_pop (TV_FINAL); 3545 3546 /* Make sure volatile mem refs aren't considered valid operands for 3547 arithmetic insns. We must call this here if this is a nested inline 3548 function, since the above code leaves us in the init_recog state 3549 (from final.c), and the function context push/pop code does not 3550 save/restore volatile_ok. 3551 3552 ??? Maybe it isn't necessary for expand_start_function to call this 3553 anymore if we do it here? */ 3554 3555 init_recog_no_volatile (); 3556 3557 /* We're done with this function. Free up memory if we can. */ 3558 free_after_parsing (cfun); 3559 if (! DECL_DEFER_OUTPUT (decl)) 3560 { 3561 free_after_compilation (cfun); 3562 3563 /* Clear integrate.c's pointer to the cfun structure we just 3564 destroyed. */ 3565 DECL_SAVED_INSNS (decl) = 0; 3566 } 3567 cfun = 0; 3568 3569 ggc_collect (); 3570 3571 timevar_pop (TV_REST_OF_COMPILATION); 3572} 3573 3574static void 3575display_help () 3576{ 3577 int undoc; 3578 unsigned long i; 3579 const char *lang; 3580 3581 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n")); 3582 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n")); 3583 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n")); 3584 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n")); 3585 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n")); 3586 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")); 3587 3588 for (i = ARRAY_SIZE (f_options); i--;) 3589 { 3590 const char *description = f_options[i].description; 3591 3592 if (description != NULL && * description != 0) 3593 printf (" -f%-21s %s\n", 3594 f_options[i].string, _(description)); 3595 } 3596 3597 printf (_(" -O[number] Set optimization level to [number]\n")); 3598 printf (_(" -Os Optimize for space rather than speed\n")); 3599 for (i = LAST_PARAM; i--;) 3600 { 3601 const char *description = compiler_params[i].help; 3602 const int length = 21-strlen(compiler_params[i].option); 3603 3604 if (description != NULL && * description != 0) 3605 printf (" --param %s=<value>%.*s%s\n", 3606 compiler_params[i].option, 3607 length > 0 ? length : 1, " ", 3608 _(description)); 3609 } 3610 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n")); 3611 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n")); 3612 printf (_(" -w Suppress warnings\n")); 3613 printf (_(" -W Enable extra warnings\n")); 3614 3615 for (i = ARRAY_SIZE (W_options); i--;) 3616 { 3617 const char *description = W_options[i].description; 3618 3619 if (description != NULL && * description != 0) 3620 printf (" -W%-21s %s\n", 3621 W_options[i].string, _(description)); 3622 } 3623 3624 printf (_(" -Wunused Enable unused warnings\n")); 3625 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n")); 3626 printf (_(" -p Enable function profiling\n")); 3627#if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) 3628 printf (_(" -a Enable block profiling \n")); 3629#endif 3630#if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT 3631 printf (_(" -ax Enable jump profiling \n")); 3632#endif 3633 printf (_(" -o <file> Place output into <file> \n")); 3634 printf (_("\ 3635 -G <number> Put global and static data smaller than <number>\n\ 3636 bytes into a special section (on some targets)\n")); 3637 3638 for (i = ARRAY_SIZE (debug_args); i--;) 3639 { 3640 if (debug_args[i].description != NULL) 3641 printf (" -g%-21s %s\n", 3642 debug_args[i].arg, _(debug_args[i].description)); 3643 } 3644 3645 printf (_(" -aux-info <file> Emit declaration info into <file>\n")); 3646 printf (_(" -quiet Do not display functions compiled or elapsed time\n")); 3647 printf (_(" -version Display the compiler's version\n")); 3648 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n")); 3649 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n")); 3650#if defined INSN_SCHEDULING 3651 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n")); 3652#endif 3653 printf (_(" --help Display this information\n")); 3654 3655 undoc = 0; 3656 lang = "language"; 3657 3658 /* Display descriptions of language specific options. 3659 If there is no description, note that there is an undocumented option. 3660 If the description is empty, do not display anything. (This allows 3661 options to be deliberately undocumented, for whatever reason). 3662 If the option string is missing, then this is a marker, indicating 3663 that the description string is in fact the name of a language, whose 3664 language specific options are to follow. */ 3665 3666 if (ARRAY_SIZE (documented_lang_options) > 1) 3667 { 3668 printf (_("\nLanguage specific options:\n")); 3669 3670 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++) 3671 { 3672 const char *description = documented_lang_options[i].description; 3673 const char *option = documented_lang_options[i].option; 3674 3675 if (description == NULL) 3676 { 3677 undoc = 1; 3678 3679 if (extra_warnings) 3680 printf (_(" %-23.23s [undocumented]\n"), option); 3681 } 3682 else if (*description == 0) 3683 continue; 3684 else if (option == NULL) 3685 { 3686 if (undoc) 3687 printf 3688 (_("\nThere are undocumented %s specific options as well.\n"), 3689 lang); 3690 undoc = 0; 3691 3692 printf (_("\n Options for %s:\n"), description); 3693 3694 lang = description; 3695 } 3696 else 3697 printf (" %-23.23s %s\n", option, _(description)); 3698 } 3699 } 3700 3701 if (undoc) 3702 printf (_("\nThere are undocumented %s specific options as well.\n"), 3703 lang); 3704 3705 display_target_options (); 3706} 3707 3708static void 3709display_target_options () 3710{ 3711 int undoc, i; 3712 static bool displayed = false; 3713 3714 /* Avoid double printing for --help --target-help. */ 3715 if (displayed) 3716 return; 3717 displayed = true; 3718 3719 if (ARRAY_SIZE (target_switches) > 1 3720#ifdef TARGET_OPTIONS 3721 || ARRAY_SIZE (target_options) > 1 3722#endif 3723 ) 3724 { 3725 int doc = 0; 3726 3727 undoc = 0; 3728 3729 printf (_("\nTarget specific options:\n")); 3730 3731 for (i = ARRAY_SIZE (target_switches); i--;) 3732 { 3733 const char *option = target_switches[i].name; 3734 const char *description = target_switches[i].description; 3735 3736 if (option == NULL || *option == 0) 3737 continue; 3738 else if (description == NULL) 3739 { 3740 undoc = 1; 3741 3742 if (extra_warnings) 3743 printf (_(" -m%-23.23s [undocumented]\n"), option); 3744 } 3745 else if (* description != 0) 3746 doc += printf (" -m%-23.23s %s\n", option, _(description)); 3747 } 3748 3749#ifdef TARGET_OPTIONS 3750 for (i = ARRAY_SIZE (target_options); i--;) 3751 { 3752 const char *option = target_options[i].prefix; 3753 const char *description = target_options[i].description; 3754 3755 if (option == NULL || *option == 0) 3756 continue; 3757 else if (description == NULL) 3758 { 3759 undoc = 1; 3760 3761 if (extra_warnings) 3762 printf (_(" -m%-23.23s [undocumented]\n"), option); 3763 } 3764 else if (* description != 0) 3765 doc += printf (" -m%-23.23s %s\n", option, _(description)); 3766 } 3767#endif 3768 if (undoc) 3769 { 3770 if (doc) 3771 printf (_("\nThere are undocumented target specific options as well.\n")); 3772 else 3773 printf (_(" They exist, but they are not documented.\n")); 3774 } 3775 } 3776} 3777 3778/* Parse a -d... command line switch. */ 3779 3780static void 3781decode_d_option (arg) 3782 const char *arg; 3783{ 3784 int i, c, matched; 3785 3786 while (*arg) 3787 switch (c = *arg++) 3788 { 3789 case 'a': 3790 for (i = 0; i < (int) DFI_MAX; ++i) 3791 dump_file[i].enabled = 1; 3792 break; 3793 case 'A': 3794 flag_debug_asm = 1; 3795 break; 3796 case 'p': 3797 flag_print_asm_name = 1; 3798 break; 3799 case 'P': 3800 flag_dump_rtl_in_asm = 1; 3801 flag_print_asm_name = 1; 3802 break; 3803 case 'v': 3804 graph_dump_format = vcg; 3805 break; 3806 case 'x': 3807 rtl_dump_and_exit = 1; 3808 break; 3809 case 'y': 3810 (*lang_hooks.set_yydebug) (1); 3811 break; 3812 case 'D': /* These are handled by the preprocessor. */ 3813 case 'I': 3814 break; 3815 3816 default: 3817 matched = 0; 3818 for (i = 0; i < (int) DFI_MAX; ++i) 3819 if (c == dump_file[i].debug_switch) 3820 { 3821 dump_file[i].enabled = 1; 3822 matched = 1; 3823 } 3824 3825 if (! matched) 3826 warning ("unrecognized gcc debugging option: %c", c); 3827 break; 3828 } 3829} 3830 3831/* Parse a -f... command line switch. ARG is the value after the -f. 3832 It is safe to access 'ARG - 2' to generate the full switch name. 3833 Return the number of strings consumed. */ 3834 3835static int 3836decode_f_option (arg) 3837 const char *arg; 3838{ 3839 int j; 3840 const char *option_value = NULL; 3841 3842 /* Search for the option in the table of binary f options. */ 3843 for (j = ARRAY_SIZE (f_options); j--;) 3844 { 3845 if (!strcmp (arg, f_options[j].string)) 3846 { 3847 *f_options[j].variable = f_options[j].on_value; 3848 return 1; 3849 } 3850 3851 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-' 3852 && ! strcmp (arg + 3, f_options[j].string)) 3853 { 3854 *f_options[j].variable = ! f_options[j].on_value; 3855 return 1; 3856 } 3857 } 3858 3859 if (!strcmp (arg, "fast-math")) 3860 set_fast_math_flags (); 3861 else if (!strcmp (arg, "no-fast-math")) 3862 set_no_fast_math_flags (); 3863 else if ((option_value = skip_leading_substring (arg, "inline-limit-")) 3864 || (option_value = skip_leading_substring (arg, "inline-limit="))) 3865 { 3866 int val = 3867 read_integral_parameter (option_value, arg - 2, 3868 MAX_INLINE_INSNS); 3869 set_param_value ("max-inline-insns", val); 3870 } 3871#ifdef INSN_SCHEDULING 3872 else if ((option_value = skip_leading_substring (arg, "sched-verbose="))) 3873 fix_sched_param ("verbose", option_value); 3874#endif 3875 else if ((option_value = skip_leading_substring (arg, "fixed-"))) 3876 fix_register (option_value, 1, 1); 3877 else if ((option_value = skip_leading_substring (arg, "call-used-"))) 3878 fix_register (option_value, 0, 1); 3879 else if ((option_value = skip_leading_substring (arg, "call-saved-"))) 3880 fix_register (option_value, 0, 0); 3881 else if ((option_value = skip_leading_substring (arg, "align-loops="))) 3882 align_loops = read_integral_parameter (option_value, arg - 2, align_loops); 3883 else if ((option_value = skip_leading_substring (arg, "align-functions="))) 3884 align_functions 3885 = read_integral_parameter (option_value, arg - 2, align_functions); 3886 else if ((option_value = skip_leading_substring (arg, "align-jumps="))) 3887 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps); 3888 else if ((option_value = skip_leading_substring (arg, "align-labels="))) 3889 align_labels 3890 = read_integral_parameter (option_value, arg - 2, align_labels); 3891 else if ((option_value 3892 = skip_leading_substring (arg, "stack-limit-register="))) 3893 { 3894 int reg = decode_reg_name (option_value); 3895 if (reg < 0) 3896 error ("unrecognized register name `%s'", option_value); 3897 else 3898 stack_limit_rtx = gen_rtx_REG (Pmode, reg); 3899 } 3900 else if ((option_value 3901 = skip_leading_substring (arg, "stack-limit-symbol="))) 3902 { 3903 const char *nm; 3904 nm = ggc_strdup (option_value); 3905 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm); 3906 } 3907 else if ((option_value 3908 = skip_leading_substring (arg, "message-length="))) 3909 output_set_maximum_length 3910 (&global_dc->buffer, read_integral_parameter 3911 (option_value, arg - 2, diagnostic_line_cutoff (global_dc))); 3912 else if ((option_value 3913 = skip_leading_substring (arg, "diagnostics-show-location="))) 3914 { 3915 if (!strcmp (option_value, "once")) 3916 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE; 3917 else if (!strcmp (option_value, "every-line")) 3918 diagnostic_prefixing_rule (global_dc) 3919 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE; 3920 else 3921 error ("unrecognized option `%s'", arg - 2); 3922 } 3923 else if (!strcmp (arg, "no-stack-limit")) 3924 stack_limit_rtx = NULL_RTX; 3925 else if (!strcmp (arg, "preprocessed")) 3926 /* Recognise this switch but do nothing. This prevents warnings 3927 about an unrecognized switch if cpplib has not been linked in. */ 3928 ; 3929 else 3930 return 0; 3931 3932 return 1; 3933} 3934 3935/* Parse a -W... command line switch. ARG is the value after the -W. 3936 It is safe to access 'ARG - 2' to generate the full switch name. 3937 Return the number of strings consumed. */ 3938 3939static int 3940decode_W_option (arg) 3941 const char *arg; 3942{ 3943 const char *option_value = NULL; 3944 int j; 3945 3946 /* Search for the option in the table of binary W options. */ 3947 3948 for (j = ARRAY_SIZE (W_options); j--;) 3949 { 3950 if (!strcmp (arg, W_options[j].string)) 3951 { 3952 *W_options[j].variable = W_options[j].on_value; 3953 return 1; 3954 } 3955 3956 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-' 3957 && ! strcmp (arg + 3, W_options[j].string)) 3958 { 3959 *W_options[j].variable = ! W_options[j].on_value; 3960 return 1; 3961 } 3962 } 3963 3964 if ((option_value = skip_leading_substring (arg, "id-clash-"))) 3965 warning ("-Wid-clash-LEN is no longer supported"); 3966 else if ((option_value = skip_leading_substring (arg, "larger-than-"))) 3967 { 3968 larger_than_size = read_integral_parameter (option_value, arg - 2, -1); 3969 3970 warn_larger_than = larger_than_size != -1; 3971 } 3972 else if (!strcmp (arg, "unused")) 3973 { 3974 set_Wunused (1); 3975 } 3976 else if (!strcmp (arg, "no-unused")) 3977 { 3978 set_Wunused (0); 3979 } 3980 else 3981 return 0; 3982 3983 return 1; 3984} 3985 3986/* Parse a -g... command line switch. ARG is the value after the -g. 3987 It is safe to access 'ARG - 2' to generate the full switch name. 3988 Return the number of strings consumed. */ 3989 3990static int 3991decode_g_option (arg) 3992 const char *arg; 3993{ 3994 static unsigned level=0; 3995 /* A lot of code assumes write_symbols == NO_DEBUG if the 3996 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track 3997 of what debugging type has been selected). This records the 3998 selected type. It is an error to specify more than one 3999 debugging type. */ 4000 static enum debug_info_type selected_debug_type = NO_DEBUG; 4001 /* Non-zero if debugging format has been explicitly set. 4002 -g and -ggdb don't explicitly set the debugging format so 4003 -gdwarf -g3 is equivalent to -gdwarf3. */ 4004 static int type_explicitly_set_p = 0; 4005 /* Indexed by enum debug_info_type. */ 4006 static const char *const debug_type_names[] = 4007 { 4008 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms" 4009 }; 4010 4011 /* The maximum admissible debug level value. */ 4012 static const unsigned max_debug_level = 3; 4013 4014 /* Look up ARG in the table. */ 4015 for (da = debug_args; da->arg; da++) 4016 { 4017 const int da_len = strlen (da->arg); 4018 4019 if (da_len == 0 || ! strncmp (arg, da->arg, da_len)) 4020 { 4021 enum debug_info_type type = da->debug_type; 4022 const char *p = arg + da_len; 4023 4024 if (*p && ! ISDIGIT (*p)) 4025 continue; 4026 4027 /* A debug flag without a level defaults to level 2. 4028 Note we do not want to call read_integral_parameter 4029 for that case since it will call atoi which 4030 will return zero. 4031 4032 ??? We may want to generalize the interface to 4033 read_integral_parameter to better handle this case 4034 if this case shows up often. */ 4035 if (*p) 4036 level = read_integral_parameter (p, 0, max_debug_level + 1); 4037 else 4038 level = (level == 0) ? 2 : level; 4039 4040 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len)) 4041 { 4042 error ("use -gdwarf -g%d for DWARF v1, level %d", 4043 level, level); 4044 if (level == 2) 4045 error ("use -gdwarf-2 for DWARF v2"); 4046 } 4047 4048 if (level > max_debug_level) 4049 { 4050 warning ("\ 4051ignoring option `%s' due to invalid debug level specification", 4052 arg - 2); 4053 level = debug_info_level; 4054 } 4055 4056 if (type == NO_DEBUG) 4057 { 4058 type = PREFERRED_DEBUGGING_TYPE; 4059 4060 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0) 4061 { 4062#if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2) 4063 type = DWARF2_DEBUG; 4064#else 4065#ifdef DBX_DEBUGGING_INFO 4066 type = DBX_DEBUG; 4067#endif 4068#endif 4069 } 4070 } 4071 4072 if (type == NO_DEBUG) 4073 warning ("`%s': unknown or unsupported -g option", arg - 2); 4074 4075 /* Does it conflict with an already selected type? */ 4076 if (type_explicitly_set_p 4077 /* -g/-ggdb don't conflict with anything. */ 4078 && da->debug_type != NO_DEBUG 4079 && type != selected_debug_type) 4080 warning ("`%s' ignored, conflicts with `-g%s'", 4081 arg - 2, debug_type_names[(int) selected_debug_type]); 4082 else 4083 { 4084 /* If the format has already been set, -g/-ggdb 4085 only change the debug level. */ 4086 if (type_explicitly_set_p && da->debug_type == NO_DEBUG) 4087 /* Don't change debugging type. */ 4088 ; 4089 else 4090 { 4091 selected_debug_type = type; 4092 type_explicitly_set_p = da->debug_type != NO_DEBUG; 4093 } 4094 4095 write_symbols = (level == 0 4096 ? NO_DEBUG 4097 : selected_debug_type); 4098 use_gnu_debug_info_extensions = da->use_extensions_p; 4099 debug_info_level = (enum debug_info_level) level; 4100 } 4101 4102 break; 4103 } 4104 } 4105 4106 if (! da->arg) 4107 return 0; 4108 4109 return 1; 4110} 4111 4112/* Decode the first argument in the argv as a language-independent option. 4113 Return the number of strings consumed. */ 4114 4115static unsigned int 4116independent_decode_option (argc, argv) 4117 int argc; 4118 char **argv; 4119{ 4120 char *arg = argv[0]; 4121 4122 if (arg[0] != '-' || arg[1] == 0) 4123 { 4124 if (arg[0] == '+') 4125 return 0; 4126 4127 filename = arg; 4128 4129 return 1; 4130 } 4131 4132 arg++; 4133 4134 if (!strcmp (arg, "-help")) 4135 { 4136 display_help (); 4137 exit_after_options = 1; 4138 } 4139 4140 if (!strcmp (arg, "-target-help")) 4141 { 4142 display_target_options (); 4143 exit_after_options = 1; 4144 } 4145 4146 if (!strcmp (arg, "-version")) 4147 { 4148 print_version (stderr, ""); 4149 exit_after_options = 1; 4150 } 4151 4152 /* Handle '--param <name>=<value>'. */ 4153 if (strcmp (arg, "-param") == 0) 4154 { 4155 char *equal; 4156 4157 if (argc == 1) 4158 { 4159 error ("-param option missing argument"); 4160 return 1; 4161 } 4162 4163 /* Get the '<name>=<value>' parameter. */ 4164 arg = argv[1]; 4165 /* Look for the `='. */ 4166 equal = strchr (arg, '='); 4167 if (!equal) 4168 error ("invalid --param option: %s", arg); 4169 else 4170 { 4171 int val; 4172 4173 /* Zero out the `=' sign so that we get two separate strings. */ 4174 *equal = '\0'; 4175 /* Figure out what value is specified. */ 4176 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL); 4177 if (val != INVALID_PARAM_VAL) 4178 set_param_value (arg, val); 4179 else 4180 error ("invalid parameter value `%s'", equal + 1); 4181 } 4182 4183 return 2; 4184 } 4185 4186 if (*arg == 'Y') 4187 arg++; 4188 4189 switch (*arg) 4190 { 4191 default: 4192 return 0; 4193 4194 case 'O': 4195 /* Already been treated in main (). Do nothing. */ 4196 break; 4197 4198 case 'm': 4199 set_target_switch (arg + 1); 4200 break; 4201 4202 case 'f': 4203 return decode_f_option (arg + 1); 4204 4205 case 'g': 4206 return decode_g_option (arg + 1); 4207 4208 case 'd': 4209 if (!strcmp (arg, "dumpbase")) 4210 { 4211 if (argc == 1) 4212 return 0; 4213 4214 dump_base_name = argv[1]; 4215 return 2; 4216 } 4217 else 4218 decode_d_option (arg + 1); 4219 break; 4220 4221 case 'p': 4222 if (!strcmp (arg, "pedantic")) 4223 pedantic = 1; 4224 else if (!strcmp (arg, "pedantic-errors")) 4225 flag_pedantic_errors = pedantic = 1; 4226 else if (arg[1] == 0) 4227 profile_flag = 1; 4228 else 4229 return 0; 4230 break; 4231 4232 case 'q': 4233 if (!strcmp (arg, "quiet")) 4234 quiet_flag = 1; 4235 else 4236 return 0; 4237 break; 4238 4239 case 'v': 4240 if (!strcmp (arg, "version")) 4241 version_flag = 1; 4242 else 4243 return 0; 4244 break; 4245 4246 case 'w': 4247 if (arg[1] == 0) 4248 inhibit_warnings = 1; 4249 else 4250 return 0; 4251 break; 4252 4253 case 'W': 4254 if (arg[1] == 0) 4255 { 4256 extra_warnings = 1; 4257 /* We save the value of warn_uninitialized, since if they put 4258 -Wuninitialized on the command line, we need to generate a 4259 warning about not using it without also specifying -O. */ 4260 if (warn_uninitialized != 1) 4261 warn_uninitialized = 2; 4262 } 4263 else 4264 return decode_W_option (arg + 1); 4265 break; 4266 4267 case 'a': 4268 if (!strncmp (arg, "aux-info", 8)) 4269 { 4270 if (arg[8] == '\0') 4271 { 4272 if (argc == 1) 4273 return 0; 4274 4275 aux_info_file_name = argv[1]; 4276 flag_gen_aux_info = 1; 4277 return 2; 4278 } 4279 else if (arg[8] == '=') 4280 { 4281 aux_info_file_name = arg + 9; 4282 flag_gen_aux_info = 1; 4283 } 4284 else 4285 return 0; 4286 } 4287 else 4288 return 0; 4289 break; 4290 4291 case 'o': 4292 if (arg[1] == 0) 4293 { 4294 if (argc == 1) 4295 return 0; 4296 4297 asm_file_name = argv[1]; 4298 return 2; 4299 } 4300 return 0; 4301 4302 case 'G': 4303 { 4304 int g_switch_val; 4305 int return_val; 4306 4307 if (arg[1] == 0) 4308 { 4309 if (argc == 1) 4310 return 0; 4311 4312 g_switch_val = read_integral_parameter (argv[1], 0, -1); 4313 return_val = 2; 4314 } 4315 else 4316 { 4317 g_switch_val = read_integral_parameter (arg + 1, 0, -1); 4318 return_val = 1; 4319 } 4320 4321 if (g_switch_val == -1) 4322 return_val = 0; 4323 else 4324 { 4325 g_switch_set = TRUE; 4326 g_switch_value = g_switch_val; 4327 } 4328 4329 return return_val; 4330 } 4331 } 4332 4333 return 1; 4334} 4335 4336/* Decode -m switches. */ 4337/* Decode the switch -mNAME. */ 4338 4339static void 4340set_target_switch (name) 4341 const char *name; 4342{ 4343 size_t j; 4344 int valid_target_option = 0; 4345 4346 for (j = 0; j < ARRAY_SIZE (target_switches); j++) 4347 if (!strcmp (target_switches[j].name, name)) 4348 { 4349 if (target_switches[j].value < 0) 4350 target_flags &= ~-target_switches[j].value; 4351 else 4352 target_flags |= target_switches[j].value; 4353 valid_target_option = 1; 4354 } 4355 4356#ifdef TARGET_OPTIONS 4357 if (!valid_target_option) 4358 for (j = 0; j < ARRAY_SIZE (target_options); j++) 4359 { 4360 int len = strlen (target_options[j].prefix); 4361 if (!strncmp (target_options[j].prefix, name, len)) 4362 { 4363 *target_options[j].variable = name + len; 4364 valid_target_option = 1; 4365 } 4366 } 4367#endif 4368 4369 if (!valid_target_option) 4370 error ("invalid option `%s'", name); 4371} 4372 4373/* Print version information to FILE. 4374 Each line begins with INDENT (for the case where FILE is the 4375 assembler output file). */ 4376 4377static void 4378print_version (file, indent) 4379 FILE *file; 4380 const char *indent; 4381{ 4382#ifndef __VERSION__ 4383#define __VERSION__ "[?]" 4384#endif 4385 fnotice (file, 4386#ifdef __GNUC__ 4387 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n" 4388#else 4389 "%s%s%s version %s (%s) compiled by CC.\n" 4390#endif 4391 , indent, *indent != 0 ? " " : "", 4392 lang_hooks.name, version_string, TARGET_NAME, 4393 indent, __VERSION__); 4394} 4395 4396/* Print an option value and return the adjusted position in the line. 4397 ??? We don't handle error returns from fprintf (disk full); presumably 4398 other code will catch a disk full though. */ 4399 4400static int 4401print_single_switch (file, pos, max, indent, sep, term, type, name) 4402 FILE *file; 4403 int pos, max; 4404 const char *indent, *sep, *term, *type, *name; 4405{ 4406 /* The ultrix fprintf returns 0 on success, so compute the result we want 4407 here since we need it for the following test. */ 4408 int len = strlen (sep) + strlen (type) + strlen (name); 4409 4410 if (pos != 0 4411 && pos + len > max) 4412 { 4413 fprintf (file, "%s", term); 4414 pos = 0; 4415 } 4416 if (pos == 0) 4417 { 4418 fprintf (file, "%s", indent); 4419 pos = strlen (indent); 4420 } 4421 fprintf (file, "%s%s%s", sep, type, name); 4422 pos += len; 4423 return pos; 4424} 4425 4426/* Print active target switches to FILE. 4427 POS is the current cursor position and MAX is the size of a "line". 4428 Each line begins with INDENT and ends with TERM. 4429 Each switch is separated from the next by SEP. */ 4430 4431static void 4432print_switch_values (file, pos, max, indent, sep, term) 4433 FILE *file; 4434 int pos, max; 4435 const char *indent, *sep, *term; 4436{ 4437 size_t j; 4438 char **p; 4439 4440 /* Print the options as passed. */ 4441 4442 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term, 4443 _("options passed: "), ""); 4444 4445 for (p = &save_argv[1]; *p != NULL; p++) 4446 if (**p == '-') 4447 { 4448 /* Ignore these. */ 4449 if (strcmp (*p, "-o") == 0) 4450 { 4451 if (p[1] != NULL) 4452 p++; 4453 continue; 4454 } 4455 if (strcmp (*p, "-quiet") == 0) 4456 continue; 4457 if (strcmp (*p, "-version") == 0) 4458 continue; 4459 if ((*p)[1] == 'd') 4460 continue; 4461 4462 pos = print_single_switch (file, pos, max, indent, sep, term, *p, ""); 4463 } 4464 if (pos > 0) 4465 fprintf (file, "%s", term); 4466 4467 /* Print the -f and -m options that have been enabled. 4468 We don't handle language specific options but printing argv 4469 should suffice. */ 4470 4471 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term, 4472 _("options enabled: "), ""); 4473 4474 for (j = 0; j < ARRAY_SIZE (f_options); j++) 4475 if (*f_options[j].variable == f_options[j].on_value) 4476 pos = print_single_switch (file, pos, max, indent, sep, term, 4477 "-f", f_options[j].string); 4478 4479 /* Print target specific options. */ 4480 4481 for (j = 0; j < ARRAY_SIZE (target_switches); j++) 4482 if (target_switches[j].name[0] != '\0' 4483 && target_switches[j].value > 0 4484 && ((target_switches[j].value & target_flags) 4485 == target_switches[j].value)) 4486 { 4487 pos = print_single_switch (file, pos, max, indent, sep, term, 4488 "-m", target_switches[j].name); 4489 } 4490 4491#ifdef TARGET_OPTIONS 4492 for (j = 0; j < ARRAY_SIZE (target_options); j++) 4493 if (*target_options[j].variable != NULL) 4494 { 4495 char prefix[256]; 4496 sprintf (prefix, "-m%s", target_options[j].prefix); 4497 pos = print_single_switch (file, pos, max, indent, sep, term, 4498 prefix, *target_options[j].variable); 4499 } 4500#endif 4501 4502 fprintf (file, "%s", term); 4503} 4504 4505/* Open assembly code output file. Do this even if -fsyntax-only is 4506 on, because then the driver will have provided the name of a 4507 temporary file or bit bucket for us. NAME is the file specified on 4508 the command line, possibly NULL. */ 4509static void 4510init_asm_output (name) 4511 const char *name; 4512{ 4513 if (name == NULL && asm_file_name == 0) 4514 asm_out_file = stdout; 4515 else 4516 { 4517 if (asm_file_name == 0) 4518 { 4519 int len = strlen (dump_base_name); 4520 char *dumpname = (char *) xmalloc (len + 6); 4521 memcpy (dumpname, dump_base_name, len + 1); 4522 strip_off_ending (dumpname, len); 4523 strcat (dumpname, ".s"); 4524 asm_file_name = dumpname; 4525 } 4526 if (!strcmp (asm_file_name, "-")) 4527 asm_out_file = stdout; 4528 else 4529 asm_out_file = fopen (asm_file_name, "w"); 4530 if (asm_out_file == 0) 4531 fatal_io_error ("can't open %s for writing", asm_file_name); 4532 } 4533 4534#ifdef IO_BUFFER_SIZE 4535 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE), 4536 _IOFBF, IO_BUFFER_SIZE); 4537#endif 4538 4539 if (!flag_syntax_only) 4540 { 4541#ifdef ASM_FILE_START 4542 ASM_FILE_START (asm_out_file); 4543#endif 4544 4545#ifdef ASM_COMMENT_START 4546 if (flag_verbose_asm) 4547 { 4548 /* Print the list of options in effect. */ 4549 print_version (asm_out_file, ASM_COMMENT_START); 4550 print_switch_values (asm_out_file, 0, MAX_LINE, 4551 ASM_COMMENT_START, " ", "\n"); 4552 /* Add a blank line here so it appears in assembler output but not 4553 screen output. */ 4554 fprintf (asm_out_file, "\n"); 4555 } 4556#endif 4557 } 4558} 4559 4560/* Initialization of the front end environment, before command line 4561 options are parsed. Signal handlers, internationalization etc. 4562 ARGV0 is main's argv[0]. */ 4563static void 4564general_init (argv0) 4565 char *argv0; 4566{ 4567 char *p; 4568 4569 p = argv0 + strlen (argv0); 4570 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1])) 4571 --p; 4572 progname = p; 4573 4574 xmalloc_set_program_name (progname); 4575 4576 gcc_init_libintl (); 4577 4578 /* Install handler for SIGFPE, which may be received while we do 4579 compile-time floating point arithmetic. */ 4580 signal (SIGFPE, float_signal); 4581 4582 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */ 4583#ifdef SIGSEGV 4584 signal (SIGSEGV, crash_signal); 4585#endif 4586#ifdef SIGILL 4587 signal (SIGILL, crash_signal); 4588#endif 4589#ifdef SIGBUS 4590 signal (SIGBUS, crash_signal); 4591#endif 4592#ifdef SIGABRT 4593 signal (SIGABRT, crash_signal); 4594#endif 4595#if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT) 4596 signal (SIGIOT, crash_signal); 4597#endif 4598 4599 /* Initialize the diagnostics reporting machinery, so option parsing 4600 can give warnings and errors. */ 4601 diagnostic_initialize (global_dc); 4602} 4603 4604/* Parse command line options and set default flag values, called 4605 after language-independent option-independent initialization. Do 4606 minimal options processing. Outputting diagnostics is OK, but GC 4607 and identifier hashtables etc. are not initialized yet. */ 4608static void 4609parse_options_and_default_flags (argc, argv) 4610 int argc; 4611 char **argv; 4612{ 4613 int i; 4614 4615 /* Save in case md file wants to emit args as a comment. */ 4616 save_argc = argc; 4617 save_argv = argv; 4618 4619 /* Initialize register usage now so switches may override. */ 4620 init_reg_sets (); 4621 4622 /* Register the language-independent parameters. */ 4623 add_params (lang_independent_params, LAST_PARAM); 4624 4625 /* Perform language-specific options initialization. */ 4626 (*lang_hooks.init_options) (); 4627 4628 /* Scan to see what optimization level has been specified. That will 4629 determine the default value of many flags. */ 4630 for (i = 1; i < argc; i++) 4631 { 4632 if (!strcmp (argv[i], "-O")) 4633 { 4634 optimize = 1; 4635 optimize_size = 0; 4636 } 4637 else if (argv[i][0] == '-' && argv[i][1] == 'O') 4638 { 4639 /* Handle -Os, -O2, -O3, -O69, ... */ 4640 char *p = &argv[i][2]; 4641 4642 if ((p[0] == 's') && (p[1] == 0)) 4643 { 4644 optimize_size = 1; 4645 4646 /* Optimizing for size forces optimize to be 2. */ 4647 optimize = 2; 4648 } 4649 else 4650 { 4651 const int optimize_val = read_integral_parameter (p, p - 2, -1); 4652 if (optimize_val != -1) 4653 { 4654 optimize = optimize_val; 4655 4656#ifdef FORCE_OPTIMIZATION_DOWNGRADE 4657#warning FORCE_OPTIMIZATION_DOWNGRADE 4658 if (optimize > FORCE_OPTIMIZATION_DOWNGRADE) 4659 { 4660 optimize = FORCE_OPTIMIZATION_DOWNGRADE; 4661 warning ("\n***\n***\t-O%d converted to \"-O%d\" due to optimizer bugs on this platform\n***\n", 4662 optimize_val, 4663 FORCE_OPTIMIZATION_DOWNGRADE); 4664 4665 } 4666#endif /*FORCE_OPTIMIZATION_DOWNGRADE*/ 4667 4668#if defined(__alpha__) 4669 if (optimize > 1) 4670 { 4671 warning ("\n***\n***\tThe -O%d flag TRIGGERS KNOWN OPTIMIZER BUGS ON THIS PLATFORM\n***\n", 4672 optimize_val); 4673 } 4674#endif /*__alpha__*/ 4675 4676 optimize_size = 0; 4677 } 4678 } 4679 } 4680 } 4681 4682 if (!optimize) 4683 { 4684 flag_merge_constants = 0; 4685 } 4686 4687 if (optimize >= 1) 4688 { 4689 flag_defer_pop = 1; 4690 flag_thread_jumps = 1; 4691#ifdef DELAY_SLOTS 4692 flag_delayed_branch = 1; 4693#endif 4694#ifdef CAN_DEBUG_WITHOUT_FP 4695 flag_omit_frame_pointer = 1; 4696#endif 4697 flag_guess_branch_prob = 1; 4698 flag_cprop_registers = 1; 4699 } 4700 4701 if (optimize >= 2) 4702 { 4703 flag_optimize_sibling_calls = 1; 4704 flag_cse_follow_jumps = 1; 4705 flag_cse_skip_blocks = 1; 4706 flag_gcse = 1; 4707 flag_expensive_optimizations = 1; 4708 flag_strength_reduce = 1; 4709 flag_rerun_cse_after_loop = 1; 4710 flag_rerun_loop_opt = 1; 4711 flag_caller_saves = 1; 4712 flag_force_mem = 1; 4713 flag_peephole2 = 1; 4714#ifdef INSN_SCHEDULING 4715 flag_schedule_insns = 1; 4716 flag_schedule_insns_after_reload = 1; 4717#endif 4718 flag_regmove = 1; 4719 flag_strict_aliasing = 1; 4720 flag_delete_null_pointer_checks = 1; 4721 flag_reorder_blocks = 1; 4722 } 4723 4724 if (optimize >= 3) 4725 { 4726 flag_inline_functions = 1; 4727 flag_rename_registers = 1; 4728 } 4729 4730 if (optimize < 2 || optimize_size) 4731 { 4732 align_loops = 1; 4733 align_jumps = 1; 4734 align_labels = 1; 4735 align_functions = 1; 4736 } 4737 4738 /* Initialize whether `char' is signed. */ 4739 flag_signed_char = DEFAULT_SIGNED_CHAR; 4740#ifdef DEFAULT_SHORT_ENUMS 4741 /* Initialize how much space enums occupy, by default. */ 4742 flag_short_enums = DEFAULT_SHORT_ENUMS; 4743#endif 4744 4745 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can 4746 modify it. */ 4747 target_flags = 0; 4748 set_target_switch (""); 4749 4750 /* Unwind tables are always present in an ABI-conformant IA-64 4751 object file, so the default should be ON. */ 4752#ifdef IA64_UNWIND_INFO 4753 flag_unwind_tables = IA64_UNWIND_INFO; 4754#endif 4755 4756#ifdef OPTIMIZATION_OPTIONS 4757 /* Allow default optimizations to be specified on a per-machine basis. */ 4758 OPTIMIZATION_OPTIONS (optimize, optimize_size); 4759#endif 4760 4761 /* Perform normal command line switch decoding. */ 4762 for (i = 1; i < argc;) 4763 { 4764 int lang_processed; 4765 int indep_processed; 4766 4767 /* Give the language a chance to decode the option for itself. */ 4768 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i); 4769 4770 if (lang_processed >= 0) 4771 /* Now see if the option also has a language independent meaning. 4772 Some options are both language specific and language independent, 4773 eg --help. */ 4774 indep_processed = independent_decode_option (argc - i, argv + i); 4775 else 4776 { 4777 lang_processed = -lang_processed; 4778 indep_processed = 0; 4779 } 4780 4781 if (lang_processed || indep_processed) 4782 i += MAX (lang_processed, indep_processed); 4783 else 4784 { 4785 const char *option = NULL; 4786 const char *lang = NULL; 4787 unsigned int j; 4788 4789 /* It is possible that the command line switch is not valid for the 4790 current language, but it is valid for another language. In order 4791 to be compatible with previous versions of the compiler (which 4792 did not issue an error message in this case) we check for this 4793 possibility here. If we do find a match, then if extra_warnings 4794 is set we generate a warning message, otherwise we will just 4795 ignore the option. */ 4796 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++) 4797 { 4798 option = documented_lang_options[j].option; 4799 4800 if (option == NULL) 4801 lang = documented_lang_options[j].description; 4802 else if (! strncmp (argv[i], option, strlen (option))) 4803 break; 4804 } 4805 4806 if (j != ARRAY_SIZE (documented_lang_options)) 4807 { 4808 if (extra_warnings) 4809 { 4810 warning ("ignoring command line option '%s'", argv[i]); 4811 if (lang) 4812 warning 4813 ("(it is valid for %s but not the selected language)", 4814 lang); 4815 } 4816 } 4817 else if (argv[i][0] == '-' && argv[i][1] == 'g') 4818 warning ("`%s': unknown or unsupported -g option", &argv[i][2]); 4819 else 4820 error ("unrecognized option `%s'", argv[i]); 4821 4822 i++; 4823 } 4824 } 4825 4826 /* Set flag_no_inline before the post_options () hook. The C front 4827 ends use it to determine tree inlining defaults. FIXME: such 4828 code should be lang-independent when all front ends use tree 4829 inlining, in which case it, and this condition, should be moved 4830 to the top of process_options() instead. */ 4831 if (optimize == 0) 4832 { 4833 /* Inlining does not work if not optimizing, 4834 so force it not to be done. */ 4835 flag_no_inline = 1; 4836 warn_inline = 0; 4837 4838 /* The c_decode_option function and decode_option hook set 4839 this to `2' if -Wall is used, so we can avoid giving out 4840 lots of errors for people who don't realize what -Wall does. */ 4841 if (warn_uninitialized == 1) 4842 warning ("-Wuninitialized is not supported without -O"); 4843 } 4844 4845 /* All command line options have been parsed; allow the front end to 4846 perform consistency checks, etc. */ 4847 (*lang_hooks.post_options) (); 4848} 4849 4850/* Process the options that have been parsed. */ 4851static void 4852process_options () 4853{ 4854#ifdef OVERRIDE_OPTIONS 4855 /* Some machines may reject certain combinations of options. */ 4856 OVERRIDE_OPTIONS; 4857#endif 4858 4859 /* Set up the align_*_log variables, defaulting them to 1 if they 4860 were still unset. */ 4861 if (align_loops <= 0) align_loops = 1; 4862 if (align_loops_max_skip > align_loops || !align_loops) 4863 align_loops_max_skip = align_loops - 1; 4864 align_loops_log = floor_log2 (align_loops * 2 - 1); 4865 if (align_jumps <= 0) align_jumps = 1; 4866 if (align_jumps_max_skip > align_jumps || !align_jumps) 4867 align_jumps_max_skip = align_jumps - 1; 4868 align_jumps_log = floor_log2 (align_jumps * 2 - 1); 4869 if (align_labels <= 0) align_labels = 1; 4870 align_labels_log = floor_log2 (align_labels * 2 - 1); 4871 if (align_labels_max_skip > align_labels || !align_labels) 4872 align_labels_max_skip = align_labels - 1; 4873 if (align_functions <= 0) align_functions = 1; 4874 align_functions_log = floor_log2 (align_functions * 2 - 1); 4875 4876 /* Unrolling all loops implies that standard loop unrolling must also 4877 be done. */ 4878 if (flag_unroll_all_loops) 4879 flag_unroll_loops = 1; 4880 /* Loop unrolling requires that strength_reduction be on also. Silently 4881 turn on strength reduction here if it isn't already on. Also, the loop 4882 unrolling code assumes that cse will be run after loop, so that must 4883 be turned on also. */ 4884 if (flag_unroll_loops) 4885 { 4886 flag_strength_reduce = 1; 4887 flag_rerun_cse_after_loop = 1; 4888 } 4889 4890 if (flag_non_call_exceptions) 4891 flag_asynchronous_unwind_tables = 1; 4892 if (flag_asynchronous_unwind_tables) 4893 flag_unwind_tables = 1; 4894 4895 /* Warn about options that are not supported on this machine. */ 4896#ifndef INSN_SCHEDULING 4897 if (flag_schedule_insns || flag_schedule_insns_after_reload) 4898 warning ("instruction scheduling not supported on this target machine"); 4899#endif 4900#ifndef DELAY_SLOTS 4901 if (flag_delayed_branch) 4902 warning ("this target machine does not have delayed branches"); 4903#endif 4904 4905 /* Some operating systems do not allow profiling without a frame 4906 pointer. */ 4907 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER 4908 && profile_flag 4909 && flag_omit_frame_pointer) 4910 { 4911 error ("profiling does not work without a frame pointer"); 4912 flag_omit_frame_pointer = 0; 4913 } 4914 4915 user_label_prefix = USER_LABEL_PREFIX; 4916 if (flag_leading_underscore != -1) 4917 { 4918 /* If the default prefix is more complicated than "" or "_", 4919 issue a warning and ignore this option. */ 4920 if (user_label_prefix[0] == 0 || 4921 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0)) 4922 { 4923 user_label_prefix = flag_leading_underscore ? "_" : ""; 4924 } 4925 else 4926 warning ("-f%sleading-underscore not supported on this target machine", 4927 flag_leading_underscore ? "" : "no-"); 4928 } 4929 4930 /* If we are in verbose mode, write out the version and maybe all the 4931 option flags in use. */ 4932 if (version_flag) 4933 { 4934 print_version (stderr, ""); 4935 if (! quiet_flag) 4936 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n"); 4937 } 4938 4939 if (! quiet_flag) 4940 time_report = 1; 4941 4942 if (flag_syntax_only) 4943 { 4944 write_symbols = NO_DEBUG; 4945 profile_flag = 0; 4946 } 4947 4948 /* Now we know write_symbols, set up the debug hooks based on it. 4949 By default we do nothing for debug output. */ 4950#if defined(DBX_DEBUGGING_INFO) 4951 if (write_symbols == DBX_DEBUG) 4952 debug_hooks = &dbx_debug_hooks; 4953#endif 4954#if defined(XCOFF_DEBUGGING_INFO) 4955 if (write_symbols == XCOFF_DEBUG) 4956 debug_hooks = &xcoff_debug_hooks; 4957#endif 4958#ifdef SDB_DEBUGGING_INFO 4959 if (write_symbols == SDB_DEBUG) 4960 debug_hooks = &sdb_debug_hooks; 4961#endif 4962#ifdef DWARF_DEBUGGING_INFO 4963 if (write_symbols == DWARF_DEBUG) 4964 debug_hooks = &dwarf_debug_hooks; 4965#endif 4966#ifdef DWARF2_DEBUGGING_INFO 4967 if (write_symbols == DWARF2_DEBUG) 4968 debug_hooks = &dwarf2_debug_hooks; 4969#endif 4970#ifdef VMS_DEBUGGING_INFO 4971 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG) 4972 debug_hooks = &vmsdbg_debug_hooks; 4973#endif 4974 4975 /* If auxiliary info generation is desired, open the output file. 4976 This goes in the same directory as the source file--unlike 4977 all the other output files. */ 4978 if (flag_gen_aux_info) 4979 { 4980 aux_info_file = fopen (aux_info_file_name, "w"); 4981 if (aux_info_file == 0) 4982 fatal_io_error ("can't open %s", aux_info_file_name); 4983 } 4984 4985 if (! targetm.have_named_sections) 4986 { 4987 if (flag_function_sections) 4988 { 4989 warning ("-ffunction-sections not supported for this target"); 4990 flag_function_sections = 0; 4991 } 4992 if (flag_data_sections) 4993 { 4994 warning ("-fdata-sections not supported for this target"); 4995 flag_data_sections = 0; 4996 } 4997 } 4998 4999 if (flag_function_sections && profile_flag) 5000 { 5001 warning ("-ffunction-sections disabled; it makes profiling impossible"); 5002 flag_function_sections = 0; 5003 } 5004 5005#ifndef HAVE_prefetch 5006 if (flag_prefetch_loop_arrays) 5007 { 5008 warning ("-fprefetch-loop-arrays not supported for this target"); 5009 flag_prefetch_loop_arrays = 0; 5010 } 5011#else 5012 if (flag_prefetch_loop_arrays && !HAVE_prefetch) 5013 { 5014 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)"); 5015 flag_prefetch_loop_arrays = 0; 5016 } 5017#endif 5018 5019 /* This combination of options isn't handled for i386 targets and doesn't 5020 make much sense anyway, so don't allow it. */ 5021 if (flag_prefetch_loop_arrays && optimize_size) 5022 { 5023 warning ("-fprefetch-loop-arrays is not supported with -Os"); 5024 flag_prefetch_loop_arrays = 0; 5025 } 5026 5027#ifndef OBJECT_FORMAT_ELF 5028 if (flag_function_sections && write_symbols != NO_DEBUG) 5029 warning ("-ffunction-sections may affect debugging on some targets"); 5030#endif 5031} 5032 5033/* Language-independent initialization, before language-dependent 5034 initialization. */ 5035static void 5036lang_independent_init () 5037{ 5038 decl_printable_name = decl_name; 5039 lang_expand_expr = (lang_expand_expr_t) do_abort; 5040 5041 /* Set the language-dependent identifier size. */ 5042 tree_code_length[(int) IDENTIFIER_NODE] 5043 = ((lang_hooks.identifier_size - sizeof (struct tree_common) 5044 + sizeof (tree) - 1) / sizeof (tree)); 5045 5046 /* Initialize the garbage-collector, and string pools. */ 5047 init_ggc (); 5048 ggc_add_rtx_root (&stack_limit_rtx, 1); 5049 ggc_add_tree_root (¤t_function_decl, 1); 5050 ggc_add_tree_root (¤t_function_func_begin_label, 1); 5051 5052 init_stringpool (); 5053 init_obstacks (); 5054 5055 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL 5056 || debug_info_level == DINFO_LEVEL_VERBOSE 5057#ifdef VMS_DEBUGGING_INFO 5058 /* Enable line number info for traceback */ 5059 || debug_info_level > DINFO_LEVEL_NONE 5060#endif 5061 || flag_test_coverage 5062 || warn_notreached); 5063 init_regs (); 5064 init_alias_once (); 5065 init_stmt (); 5066 init_loop (); 5067 init_reload (); 5068 init_function_once (); 5069 init_stor_layout_once (); 5070 init_varasm_once (); 5071 init_EXPR_INSN_LIST_cache (); 5072 5073 /* The following initialization functions need to generate rtl, so 5074 provide a dummy function context for them. */ 5075 init_dummy_function_start (); 5076 init_expmed (); 5077 init_expr_once (); 5078 if (flag_caller_saves) 5079 init_caller_save (); 5080 expand_dummy_function_end (); 5081} 5082 5083/* Language-dependent initialization. Returns non-zero on success. */ 5084static int 5085lang_dependent_init (name) 5086 const char *name; 5087{ 5088 if (dump_base_name == 0) 5089 dump_base_name = name ? name : "gccdump"; 5090 5091 /* Front-end initialization. This hook can assume that GC, 5092 identifier hashes etc. are set up, but debug initialization is 5093 not done yet. This routine must return the original filename 5094 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */ 5095 name = (*lang_hooks.init) (name); 5096 if (name == NULL) 5097 return 0; 5098 5099 /* Is this duplication necessary? */ 5100 name = ggc_strdup (name); 5101 main_input_filename = input_filename = name; 5102 init_asm_output (name); 5103 5104 /* These create various _DECL nodes, so need to be called after the 5105 front end is initialized. */ 5106 init_eh (); 5107 init_optabs (); 5108 5109 /* Put an entry on the input file stack for the main input file. */ 5110 push_srcloc (input_filename, 0); 5111 5112 /* If dbx symbol table desired, initialize writing it and output the 5113 predefined types. */ 5114 timevar_push (TV_SYMOUT); 5115 5116#ifdef DWARF2_UNWIND_INFO 5117 if (dwarf2out_do_frame ()) 5118 dwarf2out_frame_init (); 5119#endif 5120 5121 /* Now we have the correct original filename, we can initialize 5122 debug output. */ 5123 (*debug_hooks->init) (name); 5124 5125 timevar_pop (TV_SYMOUT); 5126 5127 return 1; 5128} 5129 5130/* Clean up: close opened files, etc. */ 5131 5132static void 5133finalize () 5134{ 5135 /* Close the dump files. */ 5136 if (flag_gen_aux_info) 5137 { 5138 fclose (aux_info_file); 5139 if (errorcount) 5140 unlink (aux_info_file_name); 5141 } 5142 5143 /* Close non-debugging input and output files. Take special care to note 5144 whether fclose returns an error, since the pages might still be on the 5145 buffer chain while the file is open. */ 5146 5147 if (asm_out_file) 5148 { 5149 if (ferror (asm_out_file) != 0) 5150 fatal_io_error ("error writing to %s", asm_file_name); 5151 if (fclose (asm_out_file) != 0) 5152 fatal_io_error ("error closing %s", asm_file_name); 5153 } 5154 5155 /* Do whatever is necessary to finish printing the graphs. */ 5156 if (graph_dump_format != no_graph) 5157 { 5158 int i; 5159 5160 for (i = 0; i < (int) DFI_MAX; ++i) 5161 if (dump_file[i].initialized && dump_file[i].graph_dump_p) 5162 { 5163 char seq[16]; 5164 char *suffix; 5165 5166 sprintf (seq, DUMPFILE_FORMAT, i); 5167 suffix = concat (seq, dump_file[i].extension, NULL); 5168 finish_graph_dump_file (dump_base_name, suffix); 5169 free (suffix); 5170 } 5171 } 5172 5173 if (mem_report) 5174 { 5175 ggc_print_statistics (); 5176 stringpool_statistics (); 5177 dump_tree_statistics (); 5178 } 5179 5180 /* Free up memory for the benefit of leak detectors. */ 5181 free_reg_info (); 5182 5183 /* Language-specific end of compilation actions. */ 5184 (*lang_hooks.finish) (); 5185} 5186 5187/* Initialize the compiler, and compile the input file. */ 5188static void 5189do_compile () 5190{ 5191 /* The bulk of command line switch processing. */ 5192 process_options (); 5193 5194 /* We cannot start timing until after options are processed since that 5195 says if we run timers or not. */ 5196 init_timevar (); 5197 timevar_start (TV_TOTAL); 5198 5199 /* Language-independent initialization. Also sets up GC, identifier 5200 hashes etc. */ 5201 lang_independent_init (); 5202 5203 /* Language-dependent initialization. Returns true on success. */ 5204 if (lang_dependent_init (filename)) 5205 compile_file (); 5206 5207 finalize (); 5208 5209 /* Stop timing and print the times. */ 5210 timevar_stop (TV_TOTAL); 5211 timevar_print (stderr); 5212} 5213 5214/* Entry point of cc1, cc1plus, jc1, f771, etc. 5215 Decode command args, then call compile_file. 5216 Exit code is FATAL_EXIT_CODE if can't open files or if there were 5217 any errors, or SUCCESS_EXIT_CODE if compilation succeeded. 5218 5219 It is not safe to call this function more than once. */ 5220 5221int 5222toplev_main (argc, argv) 5223 int argc; 5224 char **argv; 5225{ 5226 hex_init (); 5227 5228 /* Initialization of GCC's environment, and diagnostics. */ 5229 general_init (argv [0]); 5230 5231 /* Parse the options and do minimal processing; basically just 5232 enough to default flags appropriately. */ 5233 parse_options_and_default_flags (argc, argv); 5234 5235 /* Exit early if we can (e.g. -help). */ 5236 if (!exit_after_options) 5237 do_compile (); 5238 5239 if (errorcount || sorrycount) 5240 return (FATAL_EXIT_CODE); 5241 5242 return (SUCCESS_EXIT_CODE); 5243} 5244