toplev.c revision 103792
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 103792 2002-09-22 07:26:38Z obrien $ */ 23 24/* This is the top level of cc1/c++. 25 It parses command args, opens files, invokes the various passes 26 in the proper order, and counts the time used by each. 27 Error messages and low-level interface to malloc also handled here. */ 28 29#include "config.h" 30#undef FLOAT /* This is for hpux. They should change hpux. */ 31#undef FFS /* Some systems define this in param.h. */ 32#include "system.h" 33#include <signal.h> 34#include <setjmp.h> 35 36#ifdef HAVE_SYS_RESOURCE_H 37# include <sys/resource.h> 38#endif 39 40#ifdef HAVE_SYS_TIMES_H 41# include <sys/times.h> 42#endif 43 44#include "input.h" 45#include "tree.h" 46#include "rtl.h" 47#include "tm_p.h" 48#include "flags.h" 49#include "insn-attr.h" 50#include "insn-config.h" 51#include "insn-flags.h" 52#include "hard-reg-set.h" 53#include "recog.h" 54#include "output.h" 55#include "except.h" 56#include "function.h" 57#include "toplev.h" 58#include "expr.h" 59#include "basic-block.h" 60#include "intl.h" 61#include "ggc.h" 62#include "graph.h" 63#include "loop.h" 64#include "regs.h" 65#include "timevar.h" 66#include "diagnostic.h" 67#include "ssa.h" 68#include "params.h" 69#include "reload.h" 70#include "dwarf2asm.h" 71#include "integrate.h" 72#include "debug.h" 73#include "target.h" 74#include "langhooks.h" 75 76#if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO) 77#include "dwarf2out.h" 78#endif 79 80#if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) 81#include "dbxout.h" 82#endif 83 84#ifdef SDB_DEBUGGING_INFO 85#include "sdbout.h" 86#endif 87 88#ifdef XCOFF_DEBUGGING_INFO 89#include "xcoffout.h" /* Needed for external data 90 declarations for e.g. AIX 4.x. */ 91#endif 92 93#ifdef HALF_PIC_DEBUG 94#include "halfpic.h" 95#endif 96 97/* Carry information from ASM_DECLARE_OBJECT_NAME 98 to ASM_FINISH_DECLARE_OBJECT. */ 99 100extern int size_directive_output; 101extern tree last_assemble_variable_decl; 102 103static void general_init PARAMS ((char *)); 104static void parse_options_and_default_flags PARAMS ((int, char **)); 105static void do_compile PARAMS ((void)); 106static void process_options PARAMS ((void)); 107static void lang_independent_init PARAMS ((void)); 108static int lang_dependent_init PARAMS ((const char *)); 109static void init_asm_output PARAMS ((const char *)); 110static void finalize PARAMS ((void)); 111 112static void set_target_switch PARAMS ((const char *)); 113static const char *decl_name PARAMS ((tree, int)); 114 115static void float_signal PARAMS ((int)) ATTRIBUTE_NORETURN; 116static void crash_signal PARAMS ((int)) ATTRIBUTE_NORETURN; 117static void set_float_handler PARAMS ((jmp_buf)); 118static void compile_file PARAMS ((void)); 119static void display_help PARAMS ((void)); 120static void display_target_options PARAMS ((void)); 121 122static void decode_d_option PARAMS ((const char *)); 123static int decode_f_option PARAMS ((const char *)); 124static int decode_W_option PARAMS ((const char *)); 125static int decode_g_option PARAMS ((const char *)); 126static unsigned int independent_decode_option PARAMS ((int, char **)); 127 128static void print_version PARAMS ((FILE *, const char *)); 129static int print_single_switch PARAMS ((FILE *, int, int, const char *, 130 const char *, const char *, 131 const char *, const char *)); 132static void print_switch_values PARAMS ((FILE *, int, int, const char *, 133 const char *, const char *)); 134 135/* Length of line when printing switch values. */ 136#define MAX_LINE 75 137 138/* Name of program invoked, sans directories. */ 139 140const char *progname; 141 142/* Copy of arguments to toplev_main. */ 143int save_argc; 144char **save_argv; 145 146/* Name of current original source file (what was input to cpp). 147 This comes from each #-command in the actual input. */ 148 149const char *input_filename; 150 151/* Name of top-level original source file (what was input to cpp). 152 This comes from the #-command at the beginning of the actual input. 153 If there isn't any there, then this is the cc1 input file name. */ 154 155const char *main_input_filename; 156 157/* Current line number in real source file. */ 158 159int lineno; 160 161/* Nonzero if it is unsafe to create any new pseudo registers. */ 162int no_new_pseudos; 163 164/* Stack of currently pending input files. */ 165 166struct file_stack *input_file_stack; 167 168/* Incremented on each change to input_file_stack. */ 169int input_file_stack_tick; 170 171/* Name to use as base of names for dump output files. */ 172 173const char *dump_base_name; 174 175/* Format to use to print dumpfile index value */ 176#ifndef DUMPFILE_FORMAT 177#define DUMPFILE_FORMAT ".%02d." 178#endif 179 180/* Bit flags that specify the machine subtype we are compiling for. 181 Bits are tested using macros TARGET_... defined in the tm.h file 182 and set by `-m...' switches. Must be defined in rtlanal.c. */ 183 184extern int target_flags; 185 186/* Debug hooks - dependent upon command line options. */ 187 188struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks; 189 190/* Describes a dump file. */ 191 192struct dump_file_info 193{ 194 /* The unique extension to apply, e.g. ".jump". */ 195 const char *const extension; 196 197 /* The -d<c> character that enables this dump file. */ 198 char const debug_switch; 199 200 /* True if there is a corresponding graph dump file. */ 201 char const graph_dump_p; 202 203 /* True if the user selected this dump. */ 204 char enabled; 205 206 /* True if the files have been initialized (ie truncated). */ 207 char initialized; 208}; 209 210/* Enumerate the extant dump files. */ 211 212enum dump_file_index 213{ 214 DFI_rtl, 215 DFI_sibling, 216 DFI_eh, 217 DFI_jump, 218 DFI_ssa, 219 DFI_ssa_ccp, 220 DFI_ssa_dce, 221 DFI_ussa, 222 DFI_cse, 223 DFI_addressof, 224 DFI_gcse, 225 DFI_loop, 226 DFI_cse2, 227 DFI_cfg, 228 DFI_bp, 229 DFI_life, 230 DFI_combine, 231 DFI_ce, 232 DFI_regmove, 233 DFI_sched, 234 DFI_lreg, 235 DFI_greg, 236 DFI_postreload, 237 DFI_flow2, 238 DFI_peephole2, 239 DFI_rnreg, 240 DFI_ce2, 241 DFI_sched2, 242 DFI_stack, 243 DFI_bbro, 244 DFI_mach, 245 DFI_dbr, 246 DFI_MAX 247}; 248 249/* Describes all the dump files. Should be kept in order of the 250 pass and in sync with dump_file_index above. 251 252 Remaining -d letters: 253 254 " o q u " 255 " H JK OPQ TUV YZ" 256*/ 257 258static struct dump_file_info dump_file[DFI_MAX] = 259{ 260 { "rtl", 'r', 0, 0, 0 }, 261 { "sibling", 'i', 0, 0, 0 }, 262 { "eh", 'h', 0, 0, 0 }, 263 { "jump", 'j', 0, 0, 0 }, 264 { "ssa", 'e', 1, 0, 0 }, 265 { "ssaccp", 'W', 1, 0, 0 }, 266 { "ssadce", 'X', 1, 0, 0 }, 267 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */ 268 { "cse", 's', 0, 0, 0 }, 269 { "addressof", 'F', 0, 0, 0 }, 270 { "gcse", 'G', 1, 0, 0 }, 271 { "loop", 'L', 1, 0, 0 }, 272 { "cse2", 't', 1, 0, 0 }, 273 { "cfg", 'f', 1, 0, 0 }, 274 { "bp", 'b', 1, 0, 0 }, 275 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */ 276 { "combine", 'c', 1, 0, 0 }, 277 { "ce", 'C', 1, 0, 0 }, 278 { "regmove", 'N', 1, 0, 0 }, 279 { "sched", 'S', 1, 0, 0 }, 280 { "lreg", 'l', 1, 0, 0 }, 281 { "greg", 'g', 1, 0, 0 }, 282 { "postreload", 'o', 1, 0, 0 }, 283 { "flow2", 'w', 1, 0, 0 }, 284 { "peephole2", 'z', 1, 0, 0 }, 285 { "rnreg", 'n', 1, 0, 0 }, 286 { "ce2", 'E', 1, 0, 0 }, 287 { "sched2", 'R', 1, 0, 0 }, 288 { "stack", 'k', 1, 0, 0 }, 289 { "bbro", 'B', 1, 0, 0 }, 290 { "mach", 'M', 1, 0, 0 }, 291 { "dbr", 'd', 0, 0, 0 }, 292}; 293 294static int open_dump_file PARAMS ((enum dump_file_index, tree)); 295static void close_dump_file PARAMS ((enum dump_file_index, 296 void (*) (FILE *, rtx), rtx)); 297 298/* Other flags saying which kinds of debugging dump have been requested. */ 299 300int rtl_dump_and_exit; 301int flag_print_asm_name; 302static int version_flag; 303static char *filename; 304enum graph_dump_types graph_dump_format; 305 306/* Name for output file of assembly code, specified with -o. */ 307 308char *asm_file_name; 309 310/* Value of the -G xx switch, and whether it was passed or not. */ 311int g_switch_value; 312int g_switch_set; 313 314/* Type(s) of debugging information we are producing (if any). 315 See flags.h for the definitions of the different possible 316 types of debugging information. */ 317enum debug_info_type write_symbols = NO_DEBUG; 318 319/* Level of debugging information we are producing. See flags.h 320 for the definitions of the different possible levels. */ 321enum debug_info_level debug_info_level = DINFO_LEVEL_NONE; 322 323/* Nonzero means use GNU-only extensions in the generated symbolic 324 debugging information. */ 325/* Currently, this only has an effect when write_symbols is set to 326 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */ 327int use_gnu_debug_info_extensions = 0; 328 329/* Nonzero means do optimizations. -O. 330 Particular numeric values stand for particular amounts of optimization; 331 thus, -O2 stores 2 here. However, the optimizations beyond the basic 332 ones are not controlled directly by this variable. Instead, they are 333 controlled by individual `flag_...' variables that are defaulted 334 based on this variable. */ 335 336int optimize = 0; 337 338/* Nonzero means optimize for size. -Os. 339 The only valid values are zero and non-zero. When optimize_size is 340 non-zero, optimize defaults to 2, but certain individual code 341 bloating optimizations are disabled. */ 342 343int optimize_size = 0; 344 345/* Nonzero if we should exit after parsing options. */ 346static int exit_after_options = 0; 347 348/* The FUNCTION_DECL for the function currently being compiled, 349 or 0 if between functions. */ 350tree current_function_decl; 351 352/* Set to the FUNC_BEGIN label of the current function, or NULL_TREE 353 if none. */ 354tree current_function_func_begin_label; 355 356/* Pointer to function to compute the name to use to print a declaration. 357 DECL is the declaration in question. 358 VERBOSITY determines what information will be printed: 359 0: DECL_NAME, demangled as necessary. 360 1: and scope information. 361 2: and any other information that might be interesting, such as function 362 parameter types in C++. */ 363 364const char *(*decl_printable_name) PARAMS ((tree, int)); 365 366/* Pointer to function to compute rtl for a language-specific tree code. */ 367 368typedef rtx (*lang_expand_expr_t) 369 PARAMS ((union tree_node *, rtx, enum machine_mode, 370 enum expand_modifier modifier)); 371 372lang_expand_expr_t lang_expand_expr = 0; 373 374/* Pointer to function to finish handling an incomplete decl at the 375 end of compilation. */ 376 377void (*incomplete_decl_finalize_hook) PARAMS ((tree)) = 0; 378 379/* Nonzero if doing dwarf2 duplicate elimination. */ 380 381int flag_eliminate_dwarf2_dups = 0; 382 383/* Nonzero if generating code to do profiling. */ 384 385int profile_flag = 0; 386 387/* Nonzero if generating code to profile program flow graph arcs. */ 388 389int profile_arc_flag = 0; 390 391/* Nonzero if generating info for gcov to calculate line test coverage. */ 392 393int flag_test_coverage = 0; 394 395/* Nonzero indicates that branch taken probabilities should be calculated. */ 396 397int flag_branch_probabilities = 0; 398 399/* Nonzero if basic blocks should be reordered. */ 400 401int flag_reorder_blocks = 0; 402 403/* Nonzero if registers should be renamed. */ 404 405int flag_rename_registers = 0; 406int flag_cprop_registers = 0; 407 408/* Nonzero for -pedantic switch: warn about anything 409 that standard spec forbids. */ 410 411int pedantic = 0; 412 413/* Temporarily suppress certain warnings. 414 This is set while reading code from a system header file. */ 415 416int in_system_header = 0; 417 418/* Don't print functions as they are compiled. -quiet. */ 419 420int quiet_flag = 0; 421 422/* Print times taken by the various passes. -ftime-report. */ 423 424int time_report = 0; 425 426/* Print memory still in use at end of compilation (which may have little 427 to do with peak memory consumption). -fmem-report. */ 428 429int mem_report = 0; 430 431/* Non-zero means to collect statistics which might be expensive 432 and to print them when we are done. */ 433int flag_detailed_statistics = 0; 434 435 436/* -f flags. */ 437 438/* Nonzero means `char' should be signed. */ 439 440int flag_signed_char; 441 442/* Nonzero means give an enum type only as many bytes as it needs. */ 443 444int flag_short_enums; 445 446/* Nonzero for -fcaller-saves: allocate values in regs that need to 447 be saved across function calls, if that produces overall better code. 448 Optional now, so people can test it. */ 449 450#ifdef DEFAULT_CALLER_SAVES 451int flag_caller_saves = 1; 452#else 453int flag_caller_saves = 0; 454#endif 455 456/* Nonzero if structures and unions should be returned in memory. 457 458 This should only be defined if compatibility with another compiler or 459 with an ABI is needed, because it results in slower code. */ 460 461#ifndef DEFAULT_PCC_STRUCT_RETURN 462#define DEFAULT_PCC_STRUCT_RETURN 1 463#endif 464 465/* Nonzero for -fpcc-struct-return: return values the same way PCC does. */ 466 467int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN; 468 469/* Nonzero for -fforce-mem: load memory value into a register 470 before arithmetic on it. This makes better cse but slower compilation. */ 471 472int flag_force_mem = 0; 473 474/* Nonzero for -fforce-addr: load memory address into a register before 475 reference to memory. This makes better cse but slower compilation. */ 476 477int flag_force_addr = 0; 478 479/* Nonzero for -fdefer-pop: don't pop args after each function call; 480 instead save them up to pop many calls' args with one insns. */ 481 482int flag_defer_pop = 0; 483 484/* Nonzero for -ffloat-store: don't allocate floats and doubles 485 in extended-precision registers. */ 486 487int flag_float_store = 0; 488 489/* Nonzero for -fcse-follow-jumps: 490 have cse follow jumps to do a more extensive job. */ 491 492int flag_cse_follow_jumps; 493 494/* Nonzero for -fcse-skip-blocks: 495 have cse follow a branch around a block. */ 496int flag_cse_skip_blocks; 497 498/* Nonzero for -fexpensive-optimizations: 499 perform miscellaneous relatively-expensive optimizations. */ 500int flag_expensive_optimizations; 501 502/* Nonzero for -fthread-jumps: 503 have jump optimize output of loop. */ 504 505int flag_thread_jumps; 506 507/* Nonzero enables strength-reduction in loop.c. */ 508 509int flag_strength_reduce = 0; 510 511/* Nonzero enables loop unrolling in unroll.c. Only loops for which the 512 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY, 513 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are 514 unrolled. */ 515 516int flag_unroll_loops; 517 518/* Nonzero enables loop unrolling in unroll.c. All loops are unrolled. 519 This is generally not a win. */ 520 521int flag_unroll_all_loops; 522 523/* Nonzero enables prefetch optimizations for arrays in loops. */ 524 525int flag_prefetch_loop_arrays; 526 527/* Nonzero forces all invariant computations in loops to be moved 528 outside the loop. */ 529 530int flag_move_all_movables = 0; 531 532/* Nonzero forces all general induction variables in loops to be 533 strength reduced. */ 534 535int flag_reduce_all_givs = 0; 536 537/* Nonzero to perform full register move optimization passes. This is the 538 default for -O2. */ 539 540int flag_regmove = 0; 541 542/* Nonzero for -fwritable-strings: 543 store string constants in data segment and don't uniquize them. */ 544 545int flag_writable_strings = 0; 546 547/* Nonzero means don't put addresses of constant functions in registers. 548 Used for compiling the Unix kernel, where strange substitutions are 549 done on the assembly output. */ 550 551int flag_no_function_cse = 0; 552 553/* Nonzero for -fomit-frame-pointer: 554 don't make a frame pointer in simple functions that don't require one. */ 555 556int flag_omit_frame_pointer = 0; 557 558/* Nonzero means place each function into its own section on those platforms 559 which support arbitrary section names and unlimited numbers of sections. */ 560 561int flag_function_sections = 0; 562 563/* ... and similar for data. */ 564 565int flag_data_sections = 0; 566 567/* Nonzero to inhibit use of define_optimization peephole opts. */ 568 569int flag_no_peephole = 0; 570 571/* Nonzero allows GCC to optimize sibling and tail recursive calls. */ 572 573int flag_optimize_sibling_calls = 0; 574 575/* Nonzero means the front end generally wants `errno' maintained by math 576 operations, like built-in SQRT. */ 577 578int flag_errno_math = 1; 579 580/* Nonzero means that unsafe floating-point math optimizations are allowed 581 for the sake of speed. IEEE compliance is not guaranteed, and operations 582 are allowed to assume that their arguments and results are "normal" 583 (e.g., nonnegative for SQRT). */ 584 585int flag_unsafe_math_optimizations = 0; 586 587/* Zero means that floating-point math operations cannot generate a 588 (user-visible) trap. This is the case, for example, in nonstop 589 IEEE 754 arithmetic. */ 590 591int flag_trapping_math = 1; 592 593/* 0 means straightforward implementation of complex divide acceptable. 594 1 means wide ranges of inputs must work for complex divide. 595 2 means C99-like requirements for complex divide (not yet implemented). */ 596 597int flag_complex_divide_method = 0; 598 599/* Nonzero means all references through pointers are volatile. */ 600 601int flag_volatile; 602 603/* Nonzero means treat all global and extern variables as volatile. */ 604 605int flag_volatile_global; 606 607/* Nonzero means treat all static variables as volatile. */ 608 609int flag_volatile_static; 610 611/* Nonzero means just do syntax checking; don't output anything. */ 612 613int flag_syntax_only = 0; 614 615/* Nonzero means perform global cse. */ 616 617static int flag_gcse; 618 619/* Nonzero means to use global dataflow analysis to eliminate 620 useless null pointer tests. */ 621 622static int flag_delete_null_pointer_checks; 623 624/* Nonzero means to do the enhanced load motion during gcse, which trys 625 to hoist loads by not killing them when a store to the same location 626 is seen. */ 627 628int flag_gcse_lm = 1; 629 630/* Nonzero means to perform store motion after gcse, which will try to 631 move stores closer to the exit block. Its not very effective without 632 flag_gcse_lm. */ 633 634int flag_gcse_sm = 1; 635 636/* Nonzero means to rerun cse after loop optimization. This increases 637 compilation time about 20% and picks up a few more common expressions. */ 638 639static int flag_rerun_cse_after_loop; 640 641/* Nonzero means to run loop optimizations twice. */ 642 643int flag_rerun_loop_opt; 644 645/* Nonzero for -finline-functions: ok to inline functions that look like 646 good inline candidates. */ 647 648int flag_inline_functions; 649 650/* Nonzero for -fkeep-inline-functions: even if we make a function 651 go inline everywhere, keep its definition around for debugging 652 purposes. */ 653 654int flag_keep_inline_functions; 655 656/* Nonzero means that functions will not be inlined. */ 657 658int flag_no_inline = 2; 659 660/* Nonzero means that we don't want inlining by virtue of -fno-inline, 661 not just because the tree inliner turned us off. */ 662 663int flag_really_no_inline = 2; 664 665/* Nonzero means that we should emit static const variables 666 regardless of whether or not optimization is turned on. */ 667 668int flag_keep_static_consts = 1; 669 670/* Nonzero means we should be saving declaration info into a .X file. */ 671 672int flag_gen_aux_info = 0; 673 674/* Specified name of aux-info file. */ 675 676static char *aux_info_file_name; 677 678/* Nonzero means make the text shared if supported. */ 679 680int flag_shared_data; 681 682/* Nonzero means schedule into delayed branch slots if supported. */ 683 684int flag_delayed_branch; 685 686/* Nonzero if we are compiling pure (sharable) code. 687 Value is 1 if we are doing reasonable (i.e. simple 688 offset into offset table) pic. Value is 2 if we can 689 only perform register offsets. */ 690 691int flag_pic; 692 693/* Nonzero means generate extra code for exception handling and enable 694 exception handling. */ 695 696int flag_exceptions; 697 698/* Nonzero means generate frame unwind info table when supported. */ 699 700int flag_unwind_tables = 0; 701 702/* Nonzero means generate frame unwind info table exact at each insn boundary */ 703 704int flag_asynchronous_unwind_tables = 0; 705 706/* Nonzero means don't place uninitialized global data in common storage 707 by default. */ 708 709int flag_no_common; 710 711/* Nonzero means pretend it is OK to examine bits of target floats, 712 even if that isn't true. The resulting code will have incorrect constants, 713 but the same series of instructions that the native compiler would make. */ 714 715int flag_pretend_float; 716 717/* Nonzero means change certain warnings into errors. 718 Usually these are warnings about failure to conform to some standard. */ 719 720int flag_pedantic_errors = 0; 721 722/* flag_schedule_insns means schedule insns within basic blocks (before 723 local_alloc). 724 flag_schedule_insns_after_reload means schedule insns after 725 global_alloc. */ 726 727int flag_schedule_insns = 0; 728int flag_schedule_insns_after_reload = 0; 729 730/* The following flags have effect only for scheduling before register 731 allocation: 732 733 flag_schedule_interblock means schedule insns accross basic blocks. 734 flag_schedule_speculative means allow speculative motion of non-load insns. 735 flag_schedule_speculative_load means allow speculative motion of some 736 load insns. 737 flag_schedule_speculative_load_dangerous allows speculative motion of more 738 load insns. */ 739 740int flag_schedule_interblock = 1; 741int flag_schedule_speculative = 1; 742int flag_schedule_speculative_load = 0; 743int flag_schedule_speculative_load_dangerous = 0; 744 745int flag_single_precision_constant; 746 747/* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple 748 by a cheaper branch on a count register. */ 749int flag_branch_on_count_reg = 1; 750 751/* -finhibit-size-directive inhibits output of .size for ELF. 752 This is used only for compiling crtstuff.c, 753 and it may be extended to other effects 754 needed for crtstuff.c on other systems. */ 755int flag_inhibit_size_directive = 0; 756 757/* -fverbose-asm causes extra commentary information to be produced in 758 the generated assembly code (to make it more readable). This option 759 is generally only of use to those who actually need to read the 760 generated assembly code (perhaps while debugging the compiler itself). 761 -fno-verbose-asm, the default, causes the extra information 762 to be omitted and is useful when comparing two assembler files. */ 763 764int flag_verbose_asm = 0; 765 766/* -dA causes debug commentary information to be produced in 767 the generated assembly code (to make it more readable). This option 768 is generally only of use to those who actually need to read the 769 generated assembly code (perhaps while debugging the compiler itself). 770 Currently, this switch is only used by dwarfout.c; however, it is intended 771 to be a catchall for printing debug information in the assembler file. */ 772 773int flag_debug_asm = 0; 774 775/* -dP causes the rtl to be emitted as a comment in assembly. */ 776 777int flag_dump_rtl_in_asm = 0; 778 779/* -fgnu-linker specifies use of the GNU linker for initializations. 780 (Or, more generally, a linker that handles initializations.) 781 -fno-gnu-linker says that collect2 will be used. */ 782#ifdef USE_COLLECT2 783int flag_gnu_linker = 0; 784#else 785int flag_gnu_linker = 1; 786#endif 787 788/* Enable SSA. */ 789int flag_ssa = 0; 790 791/* Enable ssa conditional constant propagation. */ 792int flag_ssa_ccp = 0; 793 794/* Enable ssa aggressive dead code elimination. */ 795int flag_ssa_dce = 0; 796 797/* Tag all structures with __attribute__(packed). */ 798int flag_pack_struct = 0; 799 800/* Nonzero means that -Wformat accepts certain system-dependent formats. */ 801int flag_format_extensions = 0; 802 803/* Emit code to check for stack overflow; also may cause large objects 804 to be allocated dynamically. */ 805int flag_stack_check; 806 807/* When non-NULL, indicates that whenever space is allocated on the 808 stack, the resulting stack pointer must not pass this 809 address---that is, for stacks that grow downward, the stack pointer 810 must always be greater than or equal to this address; for stacks 811 that grow upward, the stack pointer must be less than this address. 812 At present, the rtx may be either a REG or a SYMBOL_REF, although 813 the support provided depends on the backend. */ 814rtx stack_limit_rtx; 815 816/* 0 if pointer arguments may alias each other. True in C. 817 1 if pointer arguments may not alias each other but may alias 818 global variables. 819 2 if pointer arguments may not alias each other and may not 820 alias global variables. True in Fortran. 821 This defaults to 0 for C. */ 822int flag_argument_noalias = 0; 823 824/* Nonzero if we should do (language-dependent) alias analysis. 825 Typically, this analysis will assume that expressions of certain 826 types do not alias expressions of certain other types. Only used 827 if alias analysis (in general) is enabled. */ 828int flag_strict_aliasing = 0; 829 830/* Instrument functions with calls at entry and exit, for profiling. */ 831int flag_instrument_function_entry_exit = 0; 832 833/* Nonzero means ignore `#ident' directives. 0 means handle them. 834 On SVR4 targets, it also controls whether or not to emit a 835 string identifying the compiler. */ 836 837int flag_no_ident = 0; 838 839/* This will perform a peephole pass before sched2. */ 840int flag_peephole2 = 0; 841 842/* This will try to guess branch probabilities. */ 843int flag_guess_branch_prob = 0; 844 845/* -fbounded-pointers causes gcc to compile pointers as composite 846 objects occupying three words: the pointer value, the base address 847 of the referent object, and the address immediately beyond the end 848 of the referent object. The base and extent allow us to perform 849 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */ 850int flag_bounded_pointers = 0; 851 852/* -fcheck-bounds causes gcc to generate array bounds checks. 853 For C, C++: defaults to value of flag_bounded_pointers. 854 For ObjC: defaults to off. 855 For Java: defaults to on. 856 For Fortran: defaults to off. 857 For CHILL: defaults to off. */ 858int flag_bounds_check = 0; 859 860/* This will attempt to merge constant section constants, if 1 only 861 string constants and constants from constant pool, if 2 also constant 862 variables. */ 863int flag_merge_constants = 1; 864 865/* If one, renumber instruction UIDs to reduce the number of 866 unused UIDs if there are a lot of instructions. If greater than 867 one, unconditionally renumber instruction UIDs. */ 868int flag_renumber_insns = 1; 869 870/* Values of the -falign-* flags: how much to align labels in code. 871 0 means `use default', 1 means `don't align'. 872 For each variable, there is an _log variant which is the power 873 of two not less than the variable, for .align output. */ 874 875int align_loops; 876int align_loops_log; 877int align_loops_max_skip; 878int align_jumps; 879int align_jumps_log; 880int align_jumps_max_skip; 881int align_labels; 882int align_labels_log; 883int align_labels_max_skip; 884int align_functions; 885int align_functions_log; 886 887/* Table of supported debugging formats. */ 888static const struct 889{ 890 const char *const arg; 891 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a 892 constant expression, we use NO_DEBUG in its place. */ 893 const enum debug_info_type debug_type; 894 const int use_extensions_p; 895 const char *const description; 896} *da, 897debug_args[] = 898{ 899 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS, 900 N_("Generate debugging info in default format") }, 901 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") }, 902#ifdef DBX_DEBUGGING_INFO 903 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") }, 904 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") }, 905#endif 906#ifdef DWARF_DEBUGGING_INFO 907 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") }, 908 { "dwarf+", DWARF_DEBUG, 1, 909 N_("Generate extended DWARF-1 format debug info") }, 910#endif 911#ifdef DWARF2_DEBUGGING_INFO 912 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") }, 913#endif 914#ifdef XCOFF_DEBUGGING_INFO 915 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") }, 916 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") }, 917#endif 918#ifdef SDB_DEBUGGING_INFO 919 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") }, 920#endif 921#ifdef VMS_DEBUGGING_INFO 922 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") }, 923#endif 924 { 0, 0, 0, 0 } 925}; 926 927typedef struct 928{ 929 const char *const string; 930 int *const variable; 931 const int on_value; 932 const char *const description; 933} 934lang_independent_options; 935 936int flag_trapv = 0; 937 938/* Add or remove a leading underscore from user symbols. */ 939int flag_leading_underscore = -1; 940 941/* The user symbol prefix after having resolved same. */ 942const char *user_label_prefix; 943 944static const param_info lang_independent_params[] = { 945#define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \ 946 { OPTION, DEFAULT, HELP }, 947#include "params.def" 948#undef DEFPARAM 949 { NULL, 0, NULL } 950}; 951 952/* A default for same. */ 953#ifndef USER_LABEL_PREFIX 954#define USER_LABEL_PREFIX "" 955#endif 956 957/* Table of language-independent -f options. 958 STRING is the option name. VARIABLE is the address of the variable. 959 ON_VALUE is the value to store in VARIABLE 960 if `-fSTRING' is seen as an option. 961 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */ 962 963static const lang_independent_options f_options[] = 964{ 965 {"format-extensions", &flag_format_extensions, 1, 966 N_("-Wformat accepts certain FreeBSD system-dependent formats") }, 967 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1, 968 N_("Perform DWARF2 duplicate elimination") }, 969 {"float-store", &flag_float_store, 1, 970 N_("Do not store floats in registers") }, 971 {"volatile", &flag_volatile, 1, 972 N_("Consider all mem refs through pointers as volatile") }, 973 {"volatile-global", &flag_volatile_global, 1, 974 N_("Consider all mem refs to global data to be volatile") }, 975 {"volatile-static", &flag_volatile_static, 1, 976 N_("Consider all mem refs to static data to be volatile") }, 977 {"defer-pop", &flag_defer_pop, 1, 978 N_("Defer popping functions args from stack until later") }, 979 {"omit-frame-pointer", &flag_omit_frame_pointer, 1, 980 N_("When possible do not generate stack frames") }, 981 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1, 982 N_("Optimize sibling and tail recursive calls") }, 983 {"cse-follow-jumps", &flag_cse_follow_jumps, 1, 984 N_("When running CSE, follow jumps to their targets") }, 985 {"cse-skip-blocks", &flag_cse_skip_blocks, 1, 986 N_("When running CSE, follow conditional jumps") }, 987 {"expensive-optimizations", &flag_expensive_optimizations, 1, 988 N_("Perform a number of minor, expensive optimizations") }, 989 {"thread-jumps", &flag_thread_jumps, 1, 990 N_("Perform jump threading optimizations") }, 991 {"strength-reduce", &flag_strength_reduce, 1, 992 N_("Perform strength reduction optimizations") }, 993 {"unroll-loops", &flag_unroll_loops, 1, 994 N_("Perform loop unrolling when iteration count is known") }, 995 {"unroll-all-loops", &flag_unroll_all_loops, 1, 996 N_("Perform loop unrolling for all loops") }, 997 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1, 998 N_("Generate prefetch instructions, if available, for arrays in loops") }, 999 {"move-all-movables", &flag_move_all_movables, 1, 1000 N_("Force all loop invariant computations out of loops") }, 1001 {"reduce-all-givs", &flag_reduce_all_givs, 1, 1002 N_("Strength reduce all loop general induction variables") }, 1003 {"writable-strings", &flag_writable_strings, 1, 1004 N_("Store strings in writable data section") }, 1005 {"peephole", &flag_no_peephole, 0, 1006 N_("Enable machine specific peephole optimizations") }, 1007 {"force-mem", &flag_force_mem, 1, 1008 N_("Copy memory operands into registers before using") }, 1009 {"force-addr", &flag_force_addr, 1, 1010 N_("Copy memory address constants into regs before using") }, 1011 {"function-cse", &flag_no_function_cse, 0, 1012 N_("Allow function addresses to be held in registers") }, 1013 {"inline-functions", &flag_inline_functions, 1, 1014 N_("Integrate simple functions into their callers") }, 1015 {"keep-inline-functions", &flag_keep_inline_functions, 1, 1016 N_("Generate code for funcs even if they are fully inlined") }, 1017 {"inline", &flag_no_inline, 0, 1018 N_("Pay attention to the 'inline' keyword") }, 1019 {"keep-static-consts", &flag_keep_static_consts, 1, 1020 N_("Emit static const variables even if they are not used") }, 1021 {"syntax-only", &flag_syntax_only, 1, 1022 N_("Check for syntax errors, then stop") }, 1023 {"shared-data", &flag_shared_data, 1, 1024 N_("Mark data as shared rather than private") }, 1025 {"caller-saves", &flag_caller_saves, 1, 1026 N_("Enable saving registers around function calls") }, 1027 {"pcc-struct-return", &flag_pcc_struct_return, 1, 1028 N_("Return 'short' aggregates in memory, not registers") }, 1029 {"reg-struct-return", &flag_pcc_struct_return, 0, 1030 N_("Return 'short' aggregates in registers") }, 1031 {"delayed-branch", &flag_delayed_branch, 1, 1032 N_("Attempt to fill delay slots of branch instructions") }, 1033 {"gcse", &flag_gcse, 1, 1034 N_("Perform the global common subexpression elimination") }, 1035 {"gcse-lm", &flag_gcse_lm, 1, 1036 N_("Perform enhanced load motion during global subexpression elimination") }, 1037 {"gcse-sm", &flag_gcse_sm, 1, 1038 N_("Perform store motion after global subexpression elimination") }, 1039 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1, 1040 N_("Run CSE pass after loop optimizations") }, 1041 {"rerun-loop-opt", &flag_rerun_loop_opt, 1, 1042 N_("Run the loop optimizer twice") }, 1043 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1, 1044 N_("Delete useless null pointer checks") }, 1045 {"pretend-float", &flag_pretend_float, 1, 1046 N_("Pretend that host and target use the same FP format") }, 1047 {"schedule-insns", &flag_schedule_insns, 1, 1048 N_("Reschedule instructions before register allocation") }, 1049 {"schedule-insns2", &flag_schedule_insns_after_reload, 1, 1050 N_("Reschedule instructions after register allocation") }, 1051 {"sched-interblock",&flag_schedule_interblock, 1, 1052 N_("Enable scheduling across basic blocks") }, 1053 {"sched-spec",&flag_schedule_speculative, 1, 1054 N_("Allow speculative motion of non-loads") }, 1055 {"sched-spec-load",&flag_schedule_speculative_load, 1, 1056 N_("Allow speculative motion of some loads") }, 1057 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1, 1058 N_("Allow speculative motion of more loads") }, 1059 {"branch-count-reg",&flag_branch_on_count_reg, 1, 1060 N_("Replace add,compare,branch with branch on count reg") }, 1061 {"pic", &flag_pic, 1, 1062 N_("Generate position independent code, if possible") }, 1063 {"PIC", &flag_pic, 2, ""}, 1064 {"exceptions", &flag_exceptions, 1, 1065 N_("Enable exception handling") }, 1066 {"unwind-tables", &flag_unwind_tables, 1, 1067 N_("Just generate unwind tables for exception handling") }, 1068 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1, 1069 N_("Generate unwind tables exact at each instruction boundary") }, 1070 {"non-call-exceptions", &flag_non_call_exceptions, 1, 1071 N_("Support synchronous non-call exceptions") }, 1072 {"profile-arcs", &profile_arc_flag, 1, 1073 N_("Insert arc based program profiling code") }, 1074 {"test-coverage", &flag_test_coverage, 1, 1075 N_("Create data files needed by gcov") }, 1076 {"branch-probabilities", &flag_branch_probabilities, 1, 1077 N_("Use profiling information for branch probabilities") }, 1078 {"reorder-blocks", &flag_reorder_blocks, 1, 1079 N_("Reorder basic blocks to improve code placement") }, 1080 {"rename-registers", &flag_rename_registers, 1, 1081 N_("Do the register renaming optimization pass") }, 1082 {"cprop-registers", &flag_cprop_registers, 1, 1083 N_("Do the register copy-propagation optimization pass") }, 1084 {"common", &flag_no_common, 0, 1085 N_("Do not put uninitialized globals in the common section") }, 1086 {"inhibit-size-directive", &flag_inhibit_size_directive, 1, 1087 N_("Do not generate .size directives") }, 1088 {"function-sections", &flag_function_sections, 1, 1089 N_("place each function into its own section") }, 1090 {"data-sections", &flag_data_sections, 1, 1091 N_("place data items into their own section") }, 1092 {"verbose-asm", &flag_verbose_asm, 1, 1093 N_("Add extra commentry to assembler output") }, 1094 {"gnu-linker", &flag_gnu_linker, 1, 1095 N_("Output GNU ld formatted global initializers") }, 1096 {"regmove", &flag_regmove, 1, 1097 N_("Enables a register move optimization") }, 1098 {"optimize-register-move", &flag_regmove, 1, 1099 N_("Do the full regmove optimization pass") }, 1100 {"pack-struct", &flag_pack_struct, 1, 1101 N_("Pack structure members together without holes") }, 1102 {"stack-check", &flag_stack_check, 1, 1103 N_("Insert stack checking code into the program") }, 1104 {"argument-alias", &flag_argument_noalias, 0, 1105 N_("Specify that arguments may alias each other & globals") }, 1106 {"argument-noalias", &flag_argument_noalias, 1, 1107 N_("Assume arguments may alias globals but not each other") }, 1108 {"argument-noalias-global", &flag_argument_noalias, 2, 1109 N_("Assume arguments do not alias each other or globals") }, 1110 {"strict-aliasing", &flag_strict_aliasing, 1, 1111 N_("Assume strict aliasing rules apply") }, 1112 {"align-loops", &align_loops, 0, 1113 N_("Align the start of loops") }, 1114 {"align-jumps", &align_jumps, 0, 1115 N_("Align labels which are only reached by jumping") }, 1116 {"align-labels", &align_labels, 0, 1117 N_("Align all labels") }, 1118 {"align-functions", &align_functions, 0, 1119 N_("Align the start of functions") }, 1120 {"merge-constants", &flag_merge_constants, 1, 1121 N_("Attempt to merge identical constants accross compilation units") }, 1122 {"merge-all-constants", &flag_merge_constants, 2, 1123 N_("Attempt to merge identical constants and constant variables") }, 1124 {"dump-unnumbered", &flag_dump_unnumbered, 1, 1125 N_("Suppress output of instruction numbers and line number notes in debugging dumps") }, 1126 {"instrument-functions", &flag_instrument_function_entry_exit, 1, 1127 N_("Instrument function entry/exit with profiling calls") }, 1128 {"ssa", &flag_ssa, 1, 1129 N_("Enable SSA optimizations") }, 1130 {"ssa-ccp", &flag_ssa_ccp, 1, 1131 N_("Enable SSA conditional constant propagation") }, 1132 {"ssa-dce", &flag_ssa_dce, 1, 1133 N_("Enable aggressive SSA dead code elimination") }, 1134 {"leading-underscore", &flag_leading_underscore, 1, 1135 N_("External symbols have a leading underscore") }, 1136 {"ident", &flag_no_ident, 0, 1137 N_("Process #ident directives") }, 1138 { "peephole2", &flag_peephole2, 1, 1139 N_("Enables an rtl peephole pass run before sched2") }, 1140 { "guess-branch-probability", &flag_guess_branch_prob, 1, 1141 N_("Enables guessing of branch probabilities") }, 1142 {"math-errno", &flag_errno_math, 1, 1143 N_("Set errno after built-in math functions") }, 1144 {"trapping-math", &flag_trapping_math, 1, 1145 N_("Floating-point operations can trap") }, 1146 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1, 1147 N_("Allow math optimizations that may violate IEEE or ANSI standards") }, 1148 {"bounded-pointers", &flag_bounded_pointers, 1, 1149 N_("Compile pointers as triples: value, base & end") }, 1150 {"bounds-check", &flag_bounds_check, 1, 1151 N_("Generate code to check bounds before dereferencing pointers and arrays") }, 1152 {"single-precision-constant", &flag_single_precision_constant, 1, 1153 N_("Convert floating point constant to single precision constant") }, 1154 {"time-report", &time_report, 1, 1155 N_("Report time taken by each compiler pass at end of run") }, 1156 {"mem-report", &mem_report, 1, 1157 N_("Report on permanent memory allocation at end of run") }, 1158 { "trapv", &flag_trapv, 1, 1159 N_("Trap for signed overflow in addition / subtraction / multiplication") }, 1160}; 1161 1162/* Table of language-specific options. */ 1163 1164static const struct lang_opt 1165{ 1166 const char *const option; 1167 const char *const description; 1168} 1169documented_lang_options[] = 1170{ 1171 /* In order not to overload the --help output, the convention 1172 used here is to only describe those options which are not 1173 enabled by default. */ 1174 1175 { "-ansi", 1176 N_("Compile just for ISO C89") }, 1177 { "-fallow-single-precision", 1178 N_("Do not promote floats to double if using -traditional") }, 1179 { "-std= ", 1180 N_("Determine language standard") }, 1181 1182 { "-fsigned-bitfields", "" }, 1183 { "-funsigned-bitfields", 1184 N_("Make bit-fields by unsigned by default") }, 1185 { "-fno-signed-bitfields", "" }, 1186 { "-fno-unsigned-bitfields","" }, 1187 { "-fsigned-char", 1188 N_("Make 'char' be signed by default") }, 1189 { "-funsigned-char", 1190 N_("Make 'char' be unsigned by default") }, 1191 { "-fno-signed-char", "" }, 1192 { "-fno-unsigned-char", "" }, 1193 1194 { "-ftraditional", "" }, 1195 { "-traditional", 1196 N_("Attempt to support traditional K&R style C") }, 1197 { "-fnotraditional", "" }, 1198 { "-fno-traditional", "" }, 1199 1200 { "-fasm", "" }, 1201 { "-fno-asm", 1202 N_("Do not recognize the 'asm' keyword") }, 1203 { "-fbuiltin", "" }, 1204 { "-fno-builtin", 1205 N_("Do not recognize any built in functions") }, 1206 { "-fhosted", 1207 N_("Assume normal C execution environment") }, 1208 { "-fno-hosted", "" }, 1209 { "-ffreestanding", 1210 N_("Assume that standard libraries & main might not exist") }, 1211 { "-fno-freestanding", "" }, 1212 { "-fcond-mismatch", 1213 N_("Allow different types as args of ? operator") }, 1214 { "-fno-cond-mismatch", "" }, 1215 { "-fdollars-in-identifiers", 1216 N_("Allow the use of $ inside identifiers") }, 1217 { "-fno-dollars-in-identifiers", "" }, 1218 { "-fpreprocessed", "" }, 1219 { "-fno-preprocessed", "" }, 1220 { "-fshort-double", 1221 N_("Use the same size for double as for float") }, 1222 { "-fno-short-double", "" }, 1223 { "-fshort-enums", 1224 N_("Use the smallest fitting integer to hold enums") }, 1225 { "-fno-short-enums", "" }, 1226 { "-fshort-wchar", 1227 N_("Override the underlying type for wchar_t to `unsigned short'") }, 1228 { "-fno-short-wchar", "" }, 1229 1230 { "-Wall", 1231 N_("Enable most warning messages") }, 1232 { "-Wbad-function-cast", 1233 N_("Warn about casting functions to incompatible types") }, 1234 { "-Wno-bad-function-cast", "" }, 1235 { "-Wno-missing-noreturn", "" }, 1236 { "-Wmissing-format-attribute", 1237 N_("Warn about functions which might be candidates for format attributes") }, 1238 { "-Wno-missing-format-attribute", "" }, 1239 { "-Wcast-qual", 1240 N_("Warn about casts which discard qualifiers") }, 1241 { "-Wno-cast-qual", "" }, 1242 { "-Wchar-subscripts", 1243 N_("Warn about subscripts whose type is 'char'") }, 1244 { "-Wno-char-subscripts", "" }, 1245 { "-Wcomment", 1246 N_("Warn if nested comments are detected") }, 1247 { "-Wno-comment", "" }, 1248 { "-Wcomments", 1249 N_("Warn if nested comments are detected") }, 1250 { "-Wno-comments", "" }, 1251 { "-Wconversion", 1252 N_("Warn about possibly confusing type conversions") }, 1253 { "-Wno-conversion", "" }, 1254 { "-Wformat", 1255 N_("Warn about printf/scanf/strftime/strfmon format anomalies") }, 1256 { "-Wno-format", "" }, 1257 { "-Wformat-y2k", "" }, 1258 { "-Wno-format-y2k", 1259 N_("Don't warn about strftime formats yielding 2 digit years") }, 1260 { "-Wformat-extra-args", "" }, 1261 { "-Wno-format-extra-args", 1262 N_("Don't warn about too many arguments to format functions") }, 1263 { "-Wformat-nonliteral", 1264 N_("Warn about non-string-literal format strings") }, 1265 { "-Wno-format-nonliteral", "" }, 1266 { "-Wformat-security", 1267 N_("Warn about possible security problems with format functions") }, 1268 { "-Wno-format-security", "" }, 1269 { "-Wimplicit-function-declaration", 1270 N_("Warn about implicit function declarations") }, 1271 { "-Wno-implicit-function-declaration", "" }, 1272 { "-Werror-implicit-function-declaration", "" }, 1273 { "-Wimplicit-int", 1274 N_("Warn when a declaration does not specify a type") }, 1275 { "-Wno-implicit-int", "" }, 1276 { "-Wimplicit", "" }, 1277 { "-Wno-implicit", "" }, 1278 { "-Wimport", 1279 N_("Warn about the use of the #import directive") }, 1280 { "-Wno-import", "" }, 1281 { "-Wlong-long","" }, 1282 { "-Wno-long-long", 1283 N_("Do not warn about using 'long long' when -pedantic") }, 1284 { "-Wmain", 1285 N_("Warn about suspicious declarations of main") }, 1286 { "-Wno-main", "" }, 1287 { "-Wmissing-braces", 1288 N_("Warn about possibly missing braces around initializers") }, 1289 { "-Wno-missing-braces", "" }, 1290 { "-Wmissing-declarations", 1291 N_("Warn about global funcs without previous declarations") }, 1292 { "-Wno-missing-declarations", "" }, 1293 { "-Wmissing-prototypes", 1294 N_("Warn about global funcs without prototypes") }, 1295 { "-Wno-missing-prototypes", "" }, 1296 { "-Wmultichar", 1297 N_("Warn about use of multicharacter literals") }, 1298 { "-Wno-multichar", "" }, 1299 { "-Wnested-externs", 1300 N_("Warn about externs not at file scope level") }, 1301 { "-Wno-nested-externs", "" }, 1302 { "-Wparentheses", 1303 N_("Warn about possible missing parentheses") }, 1304 { "-Wno-parentheses", "" }, 1305 { "-Wsequence-point", 1306 N_("Warn about possible violations of sequence point rules") }, 1307 { "-Wno-sequence-point", "" }, 1308 { "-Wpointer-arith", 1309 N_("Warn about function pointer arithmetic") }, 1310 { "-Wno-pointer-arith", "" }, 1311 { "-Wredundant-decls", 1312 N_("Warn about multiple declarations of the same object") }, 1313 { "-Wno-redundant-decls", "" }, 1314 { "-Wsign-compare", 1315 N_("Warn about signed/unsigned comparisons") }, 1316 { "-Wno-sign-compare", "" }, 1317 { "-Wfloat-equal", 1318 N_("Warn about testing equality of floating point numbers") }, 1319 { "-Wno-float-equal", "" }, 1320 { "-Wunknown-pragmas", 1321 N_("Warn about unrecognized pragmas") }, 1322 { "-Wno-unknown-pragmas", "" }, 1323 { "-Wstrict-prototypes", 1324 N_("Warn about non-prototyped function decls") }, 1325 { "-Wno-strict-prototypes", "" }, 1326 { "-Wtraditional", 1327 N_("Warn about constructs whose meaning change in ISO C") }, 1328 { "-Wno-traditional", "" }, 1329 { "-Wtrigraphs", 1330 N_("Warn when trigraphs are encountered") }, 1331 { "-Wno-trigraphs", "" }, 1332 { "-Wundef", "" }, 1333 { "-Wno-undef", "" }, 1334 { "-Wwrite-strings", 1335 N_("Mark strings as 'const char *'") }, 1336 { "-Wno-write-strings", "" }, 1337 1338#define DEFINE_LANG_NAME(NAME) { NULL, NAME }, 1339 1340#include "options.h" 1341 1342}; 1343 1344/* Here is a table, controlled by the tm.h file, listing each -m switch 1345 and which bits in `target_switches' it should set or clear. 1346 If VALUE is positive, it is bits to set. 1347 If VALUE is negative, -VALUE is bits to clear. 1348 (The sign bit is not used so there is no confusion.) */ 1349 1350static const struct 1351{ 1352 const char *const name; 1353 const int value; 1354 const char *const description; 1355} 1356target_switches [] = TARGET_SWITCHES; 1357 1358/* This table is similar, but allows the switch to have a value. */ 1359 1360#ifdef TARGET_OPTIONS 1361static const struct 1362{ 1363 const char *const prefix; 1364 const char **const variable; 1365 const char *const description; 1366} 1367target_options [] = TARGET_OPTIONS; 1368#endif 1369 1370/* Options controlling warnings. */ 1371 1372/* Don't print warning messages. -w. */ 1373 1374int inhibit_warnings = 0; 1375 1376/* Don't suppress warnings from system headers. -Wsystem-headers. */ 1377 1378int warn_system_headers = 0; 1379 1380/* Print various extra warnings. -W. */ 1381 1382int extra_warnings = 0; 1383 1384/* Treat warnings as errors. -Werror. */ 1385 1386int warnings_are_errors = 0; 1387 1388/* Nonzero to warn about unused variables, functions et.al. */ 1389 1390int warn_unused_function; 1391int warn_unused_label; 1392int warn_unused_parameter; 1393int warn_unused_variable; 1394int warn_unused_value; 1395 1396/* Nonzero to warn about code which is never reached. */ 1397 1398int warn_notreached; 1399 1400/* Nonzero to warn about variables used before they are initialized. */ 1401 1402int warn_uninitialized; 1403 1404/* Nonzero means warn about all declarations which shadow others. */ 1405 1406int warn_shadow; 1407 1408/* Warn if a switch on an enum fails to have a case for every enum value. */ 1409 1410int warn_switch; 1411 1412/* Nonzero means warn about function definitions that default the return type 1413 or that use a null return and have a return-type other than void. */ 1414 1415int warn_return_type; 1416 1417/* Nonzero means warn about pointer casts that increase the required 1418 alignment of the target type (and might therefore lead to a crash 1419 due to a misaligned access). */ 1420 1421int warn_cast_align; 1422 1423/* Nonzero means warn about any objects definitions whose size is larger 1424 than N bytes. Also want about function definitions whose returned 1425 values are larger than N bytes. The value N is in `larger_than_size'. */ 1426 1427int warn_larger_than; 1428HOST_WIDE_INT larger_than_size; 1429 1430/* Nonzero means warn if inline function is too large. */ 1431 1432int warn_inline; 1433 1434/* Warn if a function returns an aggregate, 1435 since there are often incompatible calling conventions for doing this. */ 1436 1437int warn_aggregate_return; 1438 1439/* Warn if packed attribute on struct is unnecessary and inefficient. */ 1440 1441int warn_packed; 1442 1443/* Warn when gcc pads a structure to an alignment boundary. */ 1444 1445int warn_padded; 1446 1447/* Warn when an optimization pass is disabled. */ 1448 1449int warn_disabled_optimization; 1450 1451/* Warn about functions which might be candidates for attribute noreturn. */ 1452 1453int warn_missing_noreturn; 1454 1455/* Nonzero means warn about uses of __attribute__((deprecated)) 1456 declarations. */ 1457 1458int warn_deprecated_decl = 1; 1459 1460/* Likewise for -W. */ 1461 1462static const lang_independent_options W_options[] = 1463{ 1464 {"unused-function", &warn_unused_function, 1, 1465 N_("Warn when a function is unused") }, 1466 {"unused-label", &warn_unused_label, 1, 1467 N_("Warn when a label is unused") }, 1468 {"unused-parameter", &warn_unused_parameter, 1, 1469 N_("Warn when a function parameter is unused") }, 1470 {"unused-variable", &warn_unused_variable, 1, 1471 N_("Warn when a variable is unused") }, 1472 {"unused-value", &warn_unused_value, 1, 1473 N_("Warn when an expression value is unused") }, 1474 {"system-headers", &warn_system_headers, 1, 1475 N_("Do not suppress warnings from system headers") }, 1476 {"error", &warnings_are_errors, 1, 1477 N_("Treat all warnings as errors") }, 1478 {"shadow", &warn_shadow, 1, 1479 N_("Warn when one local variable shadows another") }, 1480 {"switch", &warn_switch, 1, 1481 N_("Warn about enumerated switches missing a specific case") }, 1482 {"aggregate-return", &warn_aggregate_return, 1, 1483 N_("Warn about returning structures, unions or arrays") }, 1484 {"cast-align", &warn_cast_align, 1, 1485 N_("Warn about pointer casts which increase alignment") }, 1486 {"unreachable-code", &warn_notreached, 1, 1487 N_("Warn about code that will never be executed") }, 1488 {"uninitialized", &warn_uninitialized, 1, 1489 N_("Warn about uninitialized automatic variables") }, 1490 {"inline", &warn_inline, 1, 1491 N_("Warn when an inlined function cannot be inlined") }, 1492 {"packed", &warn_packed, 1, 1493 N_("Warn when the packed attribute has no effect on struct layout") }, 1494 {"padded", &warn_padded, 1, 1495 N_("Warn when padding is required to align struct members") }, 1496 {"disabled-optimization", &warn_disabled_optimization, 1, 1497 N_("Warn when an optimization pass is disabled") }, 1498 {"deprecated-declarations", &warn_deprecated_decl, 1, 1499 N_("Warn about uses of __attribute__((deprecated)) declarations") }, 1500 {"missing-noreturn", &warn_missing_noreturn, 1, 1501 N_("Warn about functions which might be candidates for attribute noreturn") } 1502}; 1503 1504void 1505set_Wunused (setting) 1506 int setting; 1507{ 1508 warn_unused_function = setting; 1509 warn_unused_label = setting; 1510 /* Unused function parameter warnings are reported when either ``-W 1511 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate 1512 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */ 1513 if (!setting) 1514 warn_unused_parameter = 0; 1515 else if (!warn_unused_parameter) 1516 warn_unused_parameter = -1; 1517 warn_unused_variable = setting; 1518 warn_unused_value = setting; 1519} 1520 1521/* The following routines are useful in setting all the flags that 1522 -ffast-math and -fno-fast-math imply. */ 1523 1524void 1525set_fast_math_flags () 1526{ 1527 flag_trapping_math = 0; 1528 flag_unsafe_math_optimizations = 1; 1529 flag_errno_math = 0; 1530} 1531 1532void 1533set_no_fast_math_flags () 1534{ 1535 flag_trapping_math = 1; 1536 flag_unsafe_math_optimizations = 0; 1537 flag_errno_math = 1; 1538} 1539 1540 1541/* Output files for assembler code (real compiler output) 1542 and debugging dumps. */ 1543 1544FILE *asm_out_file; 1545FILE *aux_info_file; 1546FILE *rtl_dump_file = NULL; 1547 1548/* Decode the string P as an integral parameter. 1549 If the string is indeed an integer return its numeric value else 1550 issue an Invalid Option error for the option PNAME and return DEFVAL. 1551 If PNAME is zero just return DEFVAL, do not call error. */ 1552 1553int 1554read_integral_parameter (p, pname, defval) 1555 const char *p; 1556 const char *pname; 1557 const int defval; 1558{ 1559 const char *endp = p; 1560 1561 while (*endp) 1562 { 1563 if (ISDIGIT (*endp)) 1564 endp++; 1565 else 1566 break; 1567 } 1568 1569 if (*endp != 0) 1570 { 1571 if (pname != 0) 1572 error ("invalid option `%s'", pname); 1573 return defval; 1574 } 1575 1576 return atoi (p); 1577} 1578 1579 1580/* This is the default decl_printable_name function. */ 1581 1582static const char * 1583decl_name (decl, verbosity) 1584 tree decl; 1585 int verbosity ATTRIBUTE_UNUSED; 1586{ 1587 return IDENTIFIER_POINTER (DECL_NAME (decl)); 1588} 1589 1590 1591/* This calls abort and is used to avoid problems when abort if a macro. 1592 It is used when we need to pass the address of abort. */ 1593 1594void 1595do_abort () 1596{ 1597 abort (); 1598} 1599 1600/* When `malloc.c' is compiled with `rcheck' defined, 1601 it calls this function to report clobberage. */ 1602 1603void 1604botch (s) 1605 const char *s ATTRIBUTE_UNUSED; 1606{ 1607 abort (); 1608} 1609 1610/* Return the logarithm of X, base 2, considering X unsigned, 1611 if X is a power of 2. Otherwise, returns -1. 1612 1613 This should be used via the `exact_log2' macro. */ 1614 1615int 1616exact_log2_wide (x) 1617 unsigned HOST_WIDE_INT x; 1618{ 1619 int log = 0; 1620 /* Test for 0 or a power of 2. */ 1621 if (x == 0 || x != (x & -x)) 1622 return -1; 1623 while ((x >>= 1) != 0) 1624 log++; 1625 return log; 1626} 1627 1628/* Given X, an unsigned number, return the largest int Y such that 2**Y <= X. 1629 If X is 0, return -1. 1630 1631 This should be used via the floor_log2 macro. */ 1632 1633int 1634floor_log2_wide (x) 1635 unsigned HOST_WIDE_INT x; 1636{ 1637 int log = -1; 1638 while (x != 0) 1639 log++, 1640 x >>= 1; 1641 return log; 1642} 1643 1644static int float_handler_set; 1645int float_handled; 1646jmp_buf float_handler; 1647 1648/* Signals actually come here. */ 1649 1650static void 1651float_signal (signo) 1652 /* If this is missing, some compilers complain. */ 1653 int signo ATTRIBUTE_UNUSED; 1654{ 1655 if (float_handled == 0) 1656 crash_signal (signo); 1657 float_handled = 0; 1658 1659 /* On System-V derived systems, we must reinstall the signal handler. 1660 This is harmless on BSD-derived systems. */ 1661 signal (SIGFPE, float_signal); 1662 longjmp (float_handler, 1); 1663} 1664 1665/* Specify where to longjmp to when a floating arithmetic error happens. 1666 If HANDLER is 0, it means don't handle the errors any more. */ 1667 1668static void 1669set_float_handler (handler) 1670 jmp_buf handler; 1671{ 1672 float_handled = (handler != 0); 1673 if (handler) 1674 memcpy (float_handler, handler, sizeof (float_handler)); 1675 1676 if (float_handled && ! float_handler_set) 1677 { 1678 signal (SIGFPE, float_signal); 1679 float_handler_set = 1; 1680 } 1681} 1682 1683/* This is a wrapper function for code which might elicit an 1684 arithmetic exception. That code should be passed in as a function 1685 pointer FN, and one argument DATA. DATA is usually a struct which 1686 contains the real input and output for function FN. This function 1687 returns 0 (failure) if longjmp was called (i.e. an exception 1688 occurred.) It returns 1 (success) otherwise. */ 1689 1690int 1691do_float_handler (fn, data) 1692 void (*fn) PARAMS ((PTR)); 1693 PTR data; 1694{ 1695 jmp_buf buf; 1696 1697 if (setjmp (buf)) 1698 { 1699 /* We got here via longjmp () caused by an exception in function 1700 fn (). */ 1701 set_float_handler (NULL); 1702 return 0; 1703 } 1704 1705 set_float_handler (buf); 1706 (*fn)(data); 1707 set_float_handler (NULL); 1708 return 1; 1709} 1710 1711/* Handler for fatal signals, such as SIGSEGV. These are transformed 1712 into ICE messages, which is much more user friendly. */ 1713 1714static void 1715crash_signal (signo) 1716 int signo; 1717{ 1718 internal_error ("internal error: %s", strsignal (signo)); 1719} 1720 1721/* Strip off a legitimate source ending from the input string NAME of 1722 length LEN. Rather than having to know the names used by all of 1723 our front ends, we strip off an ending of a period followed by 1724 up to five characters. (Java uses ".class".) */ 1725 1726void 1727strip_off_ending (name, len) 1728 char *name; 1729 int len; 1730{ 1731 int i; 1732 for (i = 2; i < 6 && len > i; i++) 1733 { 1734 if (name[len - i] == '.') 1735 { 1736 name[len - i] = '\0'; 1737 break; 1738 } 1739 } 1740} 1741 1742/* Output a quoted string. */ 1743 1744void 1745output_quoted_string (asm_file, string) 1746 FILE *asm_file; 1747 const char *string; 1748{ 1749#ifdef OUTPUT_QUOTED_STRING 1750 OUTPUT_QUOTED_STRING (asm_file, string); 1751#else 1752 char c; 1753 1754 putc ('\"', asm_file); 1755 while ((c = *string++) != 0) 1756 { 1757 if (ISPRINT (c)) 1758 { 1759 if (c == '\"' || c == '\\') 1760 putc ('\\', asm_file); 1761 putc (c, asm_file); 1762 } 1763 else 1764 fprintf (asm_file, "\\%03o", c); 1765 } 1766 putc ('\"', asm_file); 1767#endif 1768} 1769 1770/* Output a file name in the form wanted by System V. */ 1771 1772void 1773output_file_directive (asm_file, input_name) 1774 FILE *asm_file; 1775 const char *input_name; 1776{ 1777 int len = strlen (input_name); 1778 const char *na = input_name + len; 1779 1780 /* NA gets INPUT_NAME sans directory names. */ 1781 while (na > input_name) 1782 { 1783 if (IS_DIR_SEPARATOR (na[-1])) 1784 break; 1785 na--; 1786 } 1787 1788#ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME 1789 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na); 1790#else 1791#ifdef ASM_OUTPUT_SOURCE_FILENAME 1792 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na); 1793#else 1794 fprintf (asm_file, "\t.file\t"); 1795 output_quoted_string (asm_file, na); 1796 fputc ('\n', asm_file); 1797#endif 1798#endif 1799} 1800 1801/* Routine to open a dump file. Return true if the dump file is enabled. */ 1802 1803static int 1804open_dump_file (index, decl) 1805 enum dump_file_index index; 1806 tree decl; 1807{ 1808 char *dump_name; 1809 const char *open_arg; 1810 char seq[16]; 1811 1812 if (! dump_file[index].enabled) 1813 return 0; 1814 1815 timevar_push (TV_DUMP); 1816 if (rtl_dump_file != NULL) 1817 fclose (rtl_dump_file); 1818 1819 sprintf (seq, DUMPFILE_FORMAT, index); 1820 1821 if (! dump_file[index].initialized) 1822 { 1823 /* If we've not initialized the files, do so now. */ 1824 if (graph_dump_format != no_graph 1825 && dump_file[index].graph_dump_p) 1826 { 1827 dump_name = concat (seq, dump_file[index].extension, NULL); 1828 clean_graph_dump_file (dump_base_name, dump_name); 1829 free (dump_name); 1830 } 1831 dump_file[index].initialized = 1; 1832 open_arg = "w"; 1833 } 1834 else 1835 open_arg = "a"; 1836 1837 dump_name = concat (dump_base_name, seq, 1838 dump_file[index].extension, NULL); 1839 1840 rtl_dump_file = fopen (dump_name, open_arg); 1841 if (rtl_dump_file == NULL) 1842 fatal_io_error ("can't open %s", dump_name); 1843 1844 free (dump_name); 1845 1846 if (decl) 1847 fprintf (rtl_dump_file, "\n;; Function %s\n\n", 1848 decl_printable_name (decl, 2)); 1849 1850 timevar_pop (TV_DUMP); 1851 return 1; 1852} 1853 1854/* Routine to close a dump file. */ 1855 1856static void 1857close_dump_file (index, func, insns) 1858 enum dump_file_index index; 1859 void (*func) PARAMS ((FILE *, rtx)); 1860 rtx insns; 1861{ 1862 if (! rtl_dump_file) 1863 return; 1864 1865 timevar_push (TV_DUMP); 1866 if (insns 1867 && graph_dump_format != no_graph 1868 && dump_file[index].graph_dump_p) 1869 { 1870 char seq[16]; 1871 char *suffix; 1872 1873 sprintf (seq, DUMPFILE_FORMAT, index); 1874 suffix = concat (seq, dump_file[index].extension, NULL); 1875 print_rtl_graph_with_bb (dump_base_name, suffix, insns); 1876 free (suffix); 1877 } 1878 1879 if (func && insns) 1880 func (rtl_dump_file, insns); 1881 1882 fflush (rtl_dump_file); 1883 fclose (rtl_dump_file); 1884 1885 rtl_dump_file = NULL; 1886 timevar_pop (TV_DUMP); 1887} 1888 1889/* Do any final processing required for the declarations in VEC, of 1890 which there are LEN. We write out inline functions and variables 1891 that have been deferred until this point, but which are required. 1892 Returns non-zero if anything was put out. */ 1893 1894int 1895wrapup_global_declarations (vec, len) 1896 tree *vec; 1897 int len; 1898{ 1899 tree decl; 1900 int i; 1901 int reconsider; 1902 int output_something = 0; 1903 1904 for (i = 0; i < len; i++) 1905 { 1906 decl = vec[i]; 1907 1908 /* We're not deferring this any longer. */ 1909 DECL_DEFER_OUTPUT (decl) = 0; 1910 1911 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0 1912 && incomplete_decl_finalize_hook != 0) 1913 (*incomplete_decl_finalize_hook) (decl); 1914 } 1915 1916 /* Now emit any global variables or functions that we have been 1917 putting off. We need to loop in case one of the things emitted 1918 here references another one which comes earlier in the list. */ 1919 do 1920 { 1921 reconsider = 0; 1922 for (i = 0; i < len; i++) 1923 { 1924 decl = vec[i]; 1925 1926 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl)) 1927 continue; 1928 1929 /* Don't write out static consts, unless we still need them. 1930 1931 We also keep static consts if not optimizing (for debugging), 1932 unless the user specified -fno-keep-static-consts. 1933 ??? They might be better written into the debug information. 1934 This is possible when using DWARF. 1935 1936 A language processor that wants static constants to be always 1937 written out (even if it is not used) is responsible for 1938 calling rest_of_decl_compilation itself. E.g. the C front-end 1939 calls rest_of_decl_compilation from finish_decl. 1940 One motivation for this is that is conventional in some 1941 environments to write things like: 1942 static const char rcsid[] = "... version string ..."; 1943 intending to force the string to be in the executable. 1944 1945 A language processor that would prefer to have unneeded 1946 static constants "optimized away" would just defer writing 1947 them out until here. E.g. C++ does this, because static 1948 constants are often defined in header files. 1949 1950 ??? A tempting alternative (for both C and C++) would be 1951 to force a constant to be written if and only if it is 1952 defined in a main file, as opposed to an include file. */ 1953 1954 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)) 1955 { 1956 bool needed = 1; 1957 1958 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))) 1959 /* needed */; 1960 else if (DECL_COMDAT (decl)) 1961 needed = 0; 1962 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl) 1963 && (optimize || !flag_keep_static_consts 1964 || DECL_ARTIFICIAL (decl))) 1965 needed = 0; 1966 1967 if (needed) 1968 { 1969 reconsider = 1; 1970 rest_of_decl_compilation (decl, NULL, 1, 1); 1971 } 1972 } 1973 1974 if (TREE_CODE (decl) == FUNCTION_DECL 1975 && DECL_INITIAL (decl) != 0 1976 && DECL_SAVED_INSNS (decl) != 0 1977 && (flag_keep_inline_functions 1978 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl)) 1979 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))) 1980 { 1981 reconsider = 1; 1982 output_inline_function (decl); 1983 } 1984 } 1985 1986 if (reconsider) 1987 output_something = 1; 1988 } 1989 while (reconsider); 1990 1991 return output_something; 1992} 1993 1994/* Issue appropriate warnings for the global declarations in VEC (of 1995 which there are LEN). Output debugging information for them. */ 1996 1997void 1998check_global_declarations (vec, len) 1999 tree *vec; 2000 int len; 2001{ 2002 tree decl; 2003 int i; 2004 2005 for (i = 0; i < len; i++) 2006 { 2007 decl = vec[i]; 2008 2009 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl) 2010 && ! TREE_ASM_WRITTEN (decl)) 2011 /* Cancel the RTL for this decl so that, if debugging info 2012 output for global variables is still to come, 2013 this one will be omitted. */ 2014 SET_DECL_RTL (decl, NULL_RTX); 2015 2016 /* Warn about any function 2017 declared static but not defined. 2018 We don't warn about variables, 2019 because many programs have static variables 2020 that exist only to get some text into the object file. */ 2021 if (TREE_CODE (decl) == FUNCTION_DECL 2022 && (warn_unused_function 2023 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))) 2024 && DECL_INITIAL (decl) == 0 2025 && DECL_EXTERNAL (decl) 2026 && ! DECL_ARTIFICIAL (decl) 2027 && ! TREE_PUBLIC (decl)) 2028 { 2029 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))) 2030 pedwarn_with_decl (decl, 2031 "`%s' used but never defined"); 2032 else 2033 warning_with_decl (decl, 2034 "`%s' declared `static' but never defined"); 2035 /* This symbol is effectively an "extern" declaration now. */ 2036 TREE_PUBLIC (decl) = 1; 2037 assemble_external (decl); 2038 } 2039 2040 /* Warn about static fns or vars defined but not used, 2041 but not about inline functions or static consts 2042 since defining those in header files is normal practice. */ 2043 if (((warn_unused_function 2044 && TREE_CODE (decl) == FUNCTION_DECL && ! DECL_INLINE (decl)) 2045 || (warn_unused_variable 2046 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl))) 2047 && ! DECL_IN_SYSTEM_HEADER (decl) 2048 && ! DECL_EXTERNAL (decl) 2049 && ! TREE_PUBLIC (decl) 2050 && ! TREE_USED (decl) 2051 && (TREE_CODE (decl) == FUNCTION_DECL || ! DECL_REGISTER (decl)) 2052 /* The TREE_USED bit for file-scope decls 2053 is kept in the identifier, to handle multiple 2054 external decls in different scopes. */ 2055 && ! TREE_USED (DECL_NAME (decl))) 2056 warning_with_decl (decl, "`%s' defined but not used"); 2057 2058 timevar_push (TV_SYMOUT); 2059 (*debug_hooks->global_decl) (decl); 2060 timevar_pop (TV_SYMOUT); 2061 } 2062} 2063 2064/* Save the current INPUT_FILENAME and LINENO on the top entry in the 2065 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the 2066 INPUT_FILENAME and LINENO accordingly. */ 2067 2068void 2069push_srcloc (file, line) 2070 const char *file; 2071 int line; 2072{ 2073 struct file_stack *fs; 2074 2075 if (input_file_stack) 2076 { 2077 input_file_stack->name = input_filename; 2078 input_file_stack->line = lineno; 2079 } 2080 2081 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack)); 2082 fs->name = input_filename = file; 2083 fs->line = lineno = line; 2084 fs->indent_level = 0; 2085 fs->next = input_file_stack; 2086 input_file_stack = fs; 2087 input_file_stack_tick++; 2088} 2089 2090/* Pop the top entry off the stack of presently open source files. 2091 Restore the INPUT_FILENAME and LINENO from the new topmost entry on 2092 the stack. */ 2093 2094void 2095pop_srcloc () 2096{ 2097 struct file_stack *fs; 2098 2099 fs = input_file_stack; 2100 input_file_stack = fs->next; 2101 free (fs); 2102 input_file_stack_tick++; 2103 /* The initial source file is never popped. */ 2104 if (!input_file_stack) 2105 abort (); 2106 input_filename = input_file_stack->name; 2107 lineno = input_file_stack->line; 2108} 2109 2110/* Compile an entire translation unit. Write a file of assembly 2111 output and various debugging dumps. */ 2112 2113static void 2114compile_file () 2115{ 2116 tree globals; 2117 2118 /* Initialize yet another pass. */ 2119 2120 init_final (main_input_filename); 2121 init_branch_prob (dump_base_name); 2122 2123 timevar_push (TV_PARSE); 2124 2125 /* Call the parser, which parses the entire file 2126 (calling rest_of_compilation for each function). */ 2127 yyparse (); 2128 2129 /* In case there were missing block closers, 2130 get us back to the global binding level. */ 2131 (*lang_hooks.clear_binding_stack) (); 2132 2133 /* Compilation is now finished except for writing 2134 what's left of the symbol table output. */ 2135 2136 timevar_pop (TV_PARSE); 2137 2138 if (flag_syntax_only) 2139 return; 2140 2141 globals = getdecls (); 2142 2143 /* Really define vars that have had only a tentative definition. 2144 Really output inline functions that must actually be callable 2145 and have not been output so far. */ 2146 2147 { 2148 int len = list_length (globals); 2149 tree *vec = (tree *) xmalloc (sizeof (tree) * len); 2150 int i; 2151 tree decl; 2152 2153 /* Process the decls in reverse order--earliest first. 2154 Put them into VEC from back to front, then take out from front. */ 2155 2156 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl)) 2157 vec[len - i - 1] = decl; 2158 2159 wrapup_global_declarations (vec, len); 2160 2161 /* This must occur after the loop to output deferred functions. Else 2162 the profiler initializer would not be emitted if all the functions 2163 in this compilation unit were deferred. 2164 2165 output_func_start_profiler can not cause any additional functions or 2166 data to need to be output, so it need not be in the deferred function 2167 loop above. */ 2168 output_func_start_profiler (); 2169 2170 check_global_declarations (vec, len); 2171 2172 /* Clean up. */ 2173 free (vec); 2174 } 2175 2176 /* Write out any pending weak symbol declarations. */ 2177 2178 weak_finish (); 2179 2180 /* Do dbx symbols. */ 2181 timevar_push (TV_SYMOUT); 2182 2183#ifdef DWARF2_UNWIND_INFO 2184 if (dwarf2out_do_frame ()) 2185 dwarf2out_frame_finish (); 2186#endif 2187 2188 (*debug_hooks->finish) (main_input_filename); 2189 timevar_pop (TV_SYMOUT); 2190 2191 /* Output some stuff at end of file if nec. */ 2192 2193 dw2_output_indirect_constants (); 2194 2195 end_final (dump_base_name); 2196 2197 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities) 2198 { 2199 timevar_push (TV_DUMP); 2200 open_dump_file (DFI_bp, NULL); 2201 2202 end_branch_prob (); 2203 2204 close_dump_file (DFI_bp, NULL, NULL_RTX); 2205 timevar_pop (TV_DUMP); 2206 } 2207 2208#ifdef ASM_FILE_END 2209 ASM_FILE_END (asm_out_file); 2210#endif 2211 2212 /* Attach a special .ident directive to the end of the file to identify 2213 the version of GCC which compiled this code. The format of the .ident 2214 string is patterned after the ones produced by native SVR4 compilers. */ 2215#ifdef IDENT_ASM_OP 2216 if (!flag_no_ident) 2217 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n", 2218 IDENT_ASM_OP, version_string); 2219#endif 2220 2221 if (optimize > 0 && open_dump_file (DFI_combine, NULL)) 2222 { 2223 timevar_push (TV_DUMP); 2224 dump_combine_total_stats (rtl_dump_file); 2225 close_dump_file (DFI_combine, NULL, NULL_RTX); 2226 timevar_pop (TV_DUMP); 2227 } 2228} 2229 2230/* This is called from various places for FUNCTION_DECL, VAR_DECL, 2231 and TYPE_DECL nodes. 2232 2233 This does nothing for local (non-static) variables, unless the 2234 variable is a register variable with an ASMSPEC. In that case, or 2235 if the variable is not an automatic, it sets up the RTL and 2236 outputs any assembler code (label definition, storage allocation 2237 and initialization). 2238 2239 DECL is the declaration. If ASMSPEC is nonzero, it specifies 2240 the assembler symbol name to be used. TOP_LEVEL is nonzero 2241 if this declaration is not within a function. */ 2242 2243void 2244rest_of_decl_compilation (decl, asmspec, top_level, at_end) 2245 tree decl; 2246 const char *asmspec; 2247 int top_level; 2248 int at_end; 2249{ 2250 /* Declarations of variables, and of functions defined elsewhere. */ 2251 2252/* The most obvious approach, to put an #ifndef around where 2253 this macro is used, doesn't work since it's inside a macro call. */ 2254#ifndef ASM_FINISH_DECLARE_OBJECT 2255#define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END) 2256#endif 2257 2258 /* We deferred calling assemble_alias so that we could collect 2259 other attributes such as visibility. Emit the alias now. */ 2260 { 2261 tree alias; 2262 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)); 2263 if (alias) 2264 { 2265 alias = TREE_VALUE (TREE_VALUE (alias)); 2266 alias = get_identifier (TREE_STRING_POINTER (alias)); 2267 assemble_alias (decl, alias); 2268 } 2269 } 2270 2271 /* Forward declarations for nested functions are not "external", 2272 but we need to treat them as if they were. */ 2273 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl) 2274 || TREE_CODE (decl) == FUNCTION_DECL) 2275 { 2276 timevar_push (TV_VARCONST); 2277 if (asmspec) 2278 make_decl_rtl (decl, asmspec); 2279 /* Don't output anything 2280 when a tentative file-scope definition is seen. 2281 But at end of compilation, do output code for them. */ 2282 if (at_end || !DECL_DEFER_OUTPUT (decl)) 2283 assemble_variable (decl, top_level, at_end, 0); 2284 if (decl == last_assemble_variable_decl) 2285 { 2286 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl, 2287 top_level, at_end); 2288 } 2289 timevar_pop (TV_VARCONST); 2290 } 2291 else if (DECL_REGISTER (decl) && asmspec != 0) 2292 { 2293 if (decode_reg_name (asmspec) >= 0) 2294 { 2295 SET_DECL_RTL (decl, NULL_RTX); 2296 make_decl_rtl (decl, asmspec); 2297 } 2298 else 2299 { 2300 error ("invalid register name `%s' for register variable", asmspec); 2301 DECL_REGISTER (decl) = 0; 2302 if (!top_level) 2303 expand_decl (decl); 2304 } 2305 } 2306#if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) 2307 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG) 2308 && TREE_CODE (decl) == TYPE_DECL) 2309 { 2310 timevar_push (TV_SYMOUT); 2311 dbxout_symbol (decl, 0); 2312 timevar_pop (TV_SYMOUT); 2313 } 2314#endif 2315#ifdef SDB_DEBUGGING_INFO 2316 else if (write_symbols == SDB_DEBUG && top_level 2317 && TREE_CODE (decl) == TYPE_DECL) 2318 { 2319 timevar_push (TV_SYMOUT); 2320 sdbout_symbol (decl, 0); 2321 timevar_pop (TV_SYMOUT); 2322 } 2323#endif 2324} 2325 2326/* Called after finishing a record, union or enumeral type. */ 2327 2328void 2329rest_of_type_compilation (type, toplev) 2330#if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO) 2331 tree type; 2332 int toplev; 2333#else 2334 tree type ATTRIBUTE_UNUSED; 2335 int toplev ATTRIBUTE_UNUSED; 2336#endif 2337{ 2338 timevar_push (TV_SYMOUT); 2339#if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) 2340 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG) 2341 dbxout_symbol (TYPE_STUB_DECL (type), !toplev); 2342#endif 2343#ifdef SDB_DEBUGGING_INFO 2344 if (write_symbols == SDB_DEBUG) 2345 sdbout_symbol (TYPE_STUB_DECL (type), !toplev); 2346#endif 2347#ifdef DWARF2_DEBUGGING_INFO 2348 if ((write_symbols == DWARF2_DEBUG 2349 || write_symbols == VMS_AND_DWARF2_DEBUG) 2350 && toplev) 2351 dwarf2out_decl (TYPE_STUB_DECL (type)); 2352#endif 2353 timevar_pop (TV_SYMOUT); 2354} 2355 2356/* This is called from finish_function (within yyparse) 2357 after each top-level definition is parsed. 2358 It is supposed to compile that function or variable 2359 and output the assembler code for it. 2360 After we return, the tree storage is freed. */ 2361 2362void 2363rest_of_compilation (decl) 2364 tree decl; 2365{ 2366 rtx insns; 2367 int tem; 2368 int failure = 0; 2369 int rebuild_label_notes_after_reload; 2370 int register_life_up_to_date; 2371 int cleanup_crossjump; 2372 2373 timevar_push (TV_REST_OF_COMPILATION); 2374 2375 /* Now that we're out of the frontend, we shouldn't have any more 2376 CONCATs anywhere. */ 2377 generating_concat_p = 0; 2378 2379 /* When processing delayed functions, prepare_function_start() won't 2380 have been run to re-initialize it. */ 2381 cse_not_expected = ! optimize; 2382 2383 /* First, make sure that NOTE_BLOCK is set correctly for each 2384 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */ 2385 if (!cfun->x_whole_function_mode_p) 2386 identify_blocks (); 2387 2388 /* In function-at-a-time mode, we do not attempt to keep the BLOCK 2389 tree in sensible shape. So, we just recalculate it here. */ 2390 if (cfun->x_whole_function_mode_p) 2391 reorder_blocks (); 2392 2393 init_flow (); 2394 2395 /* If we are reconsidering an inline function 2396 at the end of compilation, skip the stuff for making it inline. */ 2397 2398 if (DECL_SAVED_INSNS (decl) == 0) 2399 { 2400 int inlinable = 0; 2401 tree parent; 2402 const char *lose; 2403 2404 /* If this is nested inside an inlined external function, pretend 2405 it was only declared. Since we cannot inline such functions, 2406 generating code for this one is not only not necessary but will 2407 confuse some debugging output writers. */ 2408 for (parent = DECL_CONTEXT (current_function_decl); 2409 parent != NULL_TREE; 2410 parent = get_containing_scope (parent)) 2411 if (TREE_CODE (parent) == FUNCTION_DECL 2412 && DECL_INLINE (parent) && DECL_EXTERNAL (parent)) 2413 { 2414 DECL_INITIAL (decl) = 0; 2415 goto exit_rest_of_compilation; 2416 } 2417 2418 /* If requested, consider whether to make this function inline. */ 2419 if ((DECL_INLINE (decl) && !flag_no_inline) 2420 || flag_inline_functions) 2421 { 2422 timevar_push (TV_INTEGRATION); 2423 lose = function_cannot_inline_p (decl); 2424 timevar_pop (TV_INTEGRATION); 2425 if (lose || ! optimize) 2426 { 2427 if (warn_inline && DECL_INLINE (decl)) 2428 warning_with_decl (decl, lose); 2429 DECL_ABSTRACT_ORIGIN (decl) = 0; 2430 /* Don't really compile an extern inline function. 2431 If we can't make it inline, pretend 2432 it was only declared. */ 2433 if (DECL_EXTERNAL (decl)) 2434 { 2435 DECL_INITIAL (decl) = 0; 2436 goto exit_rest_of_compilation; 2437 } 2438 } 2439 else 2440 /* ??? Note that this has the effect of making it look 2441 like "inline" was specified for a function if we choose 2442 to inline it. This isn't quite right, but it's 2443 probably not worth the trouble to fix. */ 2444 inlinable = DECL_INLINE (decl) = 1; 2445 } 2446 2447 insns = get_insns (); 2448 2449 /* Dump the rtl code if we are dumping rtl. */ 2450 2451 if (open_dump_file (DFI_rtl, decl)) 2452 { 2453 if (DECL_SAVED_INSNS (decl)) 2454 fprintf (rtl_dump_file, ";; (integrable)\n\n"); 2455 close_dump_file (DFI_rtl, print_rtl, insns); 2456 } 2457 2458 /* Convert from NOTE_INSN_EH_REGION style notes, and do other 2459 sorts of eh initialization. Delay this until after the 2460 initial rtl dump so that we can see the original nesting. */ 2461 convert_from_eh_region_ranges (); 2462 2463 /* If function is inline, and we don't yet know whether to 2464 compile it by itself, defer decision till end of compilation. 2465 finish_compilation will call rest_of_compilation again 2466 for those functions that need to be output. Also defer those 2467 functions that we are supposed to defer. */ 2468 2469 if (inlinable 2470 || (DECL_INLINE (decl) 2471 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl) 2472 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) 2473 && ! flag_keep_inline_functions) 2474 || DECL_EXTERNAL (decl)))) 2475 DECL_DEFER_OUTPUT (decl) = 1; 2476 2477 if (DECL_INLINE (decl)) 2478 /* DWARF wants separate debugging info for abstract and 2479 concrete instances of all inline functions, including those 2480 declared inline but not inlined, and those inlined even 2481 though they weren't declared inline. Conveniently, that's 2482 what DECL_INLINE means at this point. */ 2483 (*debug_hooks->deferred_inline_function) (decl); 2484 2485 if (DECL_DEFER_OUTPUT (decl)) 2486 { 2487 /* If -Wreturn-type, we have to do a bit of compilation. We just 2488 want to call cleanup the cfg to figure out whether or not we can 2489 fall off the end of the function; we do the minimum amount of 2490 work necessary to make that safe. */ 2491 if (warn_return_type) 2492 { 2493 int saved_optimize = optimize; 2494 2495 optimize = 0; 2496 rebuild_jump_labels (insns); 2497 find_exception_handler_labels (); 2498 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2499 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP); 2500 optimize = saved_optimize; 2501 2502 /* CFG is no longer maintained up-to-date. */ 2503 free_bb_for_insn (); 2504 } 2505 2506 current_function_nothrow = nothrow_function_p (); 2507 if (current_function_nothrow) 2508 /* Now we know that this can't throw; set the flag for the benefit 2509 of other functions later in this translation unit. */ 2510 TREE_NOTHROW (current_function_decl) = 1; 2511 2512 timevar_push (TV_INTEGRATION); 2513 save_for_inline (decl); 2514 timevar_pop (TV_INTEGRATION); 2515 DECL_SAVED_INSNS (decl)->inlinable = inlinable; 2516 goto exit_rest_of_compilation; 2517 } 2518 2519 /* If specified extern inline but we aren't inlining it, we are 2520 done. This goes for anything that gets here with DECL_EXTERNAL 2521 set, not just things with DECL_INLINE. */ 2522 if (DECL_EXTERNAL (decl)) 2523 goto exit_rest_of_compilation; 2524 } 2525 2526 /* If we're emitting a nested function, make sure its parent gets 2527 emitted as well. Doing otherwise confuses debug info. */ 2528 { 2529 tree parent; 2530 for (parent = DECL_CONTEXT (current_function_decl); 2531 parent != NULL_TREE; 2532 parent = get_containing_scope (parent)) 2533 if (TREE_CODE (parent) == FUNCTION_DECL) 2534 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1; 2535 } 2536 2537 /* We are now committed to emitting code for this function. Do any 2538 preparation, such as emitting abstract debug info for the inline 2539 before it gets mangled by optimization. */ 2540 if (DECL_INLINE (decl)) 2541 (*debug_hooks->outlining_inline_function) (decl); 2542 2543 /* Remove any notes we don't need. That will make iterating 2544 over the instruction sequence faster, and allow the garbage 2545 collector to reclaim the memory used by the notes. */ 2546 remove_unnecessary_notes (); 2547 reorder_blocks (); 2548 2549 ggc_collect (); 2550 2551 /* Initialize some variables used by the optimizers. */ 2552 init_function_for_compilation (); 2553 2554 if (! DECL_DEFER_OUTPUT (decl)) 2555 TREE_ASM_WRITTEN (decl) = 1; 2556 2557 /* Now that integrate will no longer see our rtl, we need not 2558 distinguish between the return value of this function and the 2559 return value of called functions. Also, we can remove all SETs 2560 of subregs of hard registers; they are only here because of 2561 integrate. Also, we can now initialize pseudos intended to 2562 carry magic hard reg data throughout the function. */ 2563 rtx_equal_function_value_matters = 0; 2564 purge_hard_subreg_sets (get_insns ()); 2565 2566 /* Early return if there were errors. We can run afoul of our 2567 consistency checks, and there's not really much point in fixing them. 2568 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */ 2569 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type) 2570 || errorcount || sorrycount) 2571 goto exit_rest_of_compilation; 2572 2573 /* We may have potential sibling or tail recursion sites. Select one 2574 (of possibly multiple) methods of performing the call. */ 2575 if (flag_optimize_sibling_calls) 2576 { 2577 timevar_push (TV_JUMP); 2578 open_dump_file (DFI_sibling, decl); 2579 2580 optimize_sibling_and_tail_recursive_calls (); 2581 2582 close_dump_file (DFI_sibling, print_rtl, get_insns ()); 2583 timevar_pop (TV_JUMP); 2584 } 2585 2586 /* Complete generation of exception handling code. */ 2587 find_exception_handler_labels (); 2588 if (doing_eh (0)) 2589 { 2590 timevar_push (TV_JUMP); 2591 open_dump_file (DFI_eh, decl); 2592 2593 finish_eh_generation (); 2594 2595 close_dump_file (DFI_eh, print_rtl, get_insns ()); 2596 timevar_pop (TV_JUMP); 2597 } 2598 2599 /* Delay emitting hard_reg_initial_value sets until after EH landing pad 2600 generation, which might create new sets. */ 2601 emit_initial_value_sets (); 2602 2603#ifdef FINALIZE_PIC 2604 /* If we are doing position-independent code generation, now 2605 is the time to output special prologues and epilogues. 2606 We do not want to do this earlier, because it just clutters 2607 up inline functions with meaningless insns. */ 2608 if (flag_pic) 2609 FINALIZE_PIC; 2610#endif 2611 2612 insns = get_insns (); 2613 2614 /* Copy any shared structure that should not be shared. */ 2615 unshare_all_rtl (current_function_decl, insns); 2616 2617#ifdef SETJMP_VIA_SAVE_AREA 2618 /* This must be performed before virtual register instantiation. */ 2619 if (current_function_calls_alloca) 2620 optimize_save_area_alloca (insns); 2621#endif 2622 2623 /* Instantiate all virtual registers. */ 2624 instantiate_virtual_regs (current_function_decl, insns); 2625 2626 open_dump_file (DFI_jump, decl); 2627 2628 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields 2629 are initialized and to compute whether control can drop off the end 2630 of the function. */ 2631 2632 timevar_push (TV_JUMP); 2633 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this 2634 before jump optimization switches branch directions. */ 2635 expected_value_to_br_prob (); 2636 2637 reg_scan (insns, max_reg_num (), 0); 2638 rebuild_jump_labels (insns); 2639 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2640 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP); 2641 2642 /* CFG is no longer maintained up-to-date. */ 2643 free_bb_for_insn (); 2644 copy_loop_headers (insns); 2645 purge_line_number_notes (insns); 2646 2647 timevar_pop (TV_JUMP); 2648 2649 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */ 2650 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl)) 2651 { 2652 close_dump_file (DFI_jump, print_rtl, insns); 2653 goto exit_rest_of_compilation; 2654 } 2655 2656 /* Long term, this should probably move before the jump optimizer too, 2657 but I didn't want to disturb the rtl_dump_and_exit and related 2658 stuff at this time. */ 2659 if (optimize > 0 && flag_ssa) 2660 { 2661 /* Convert to SSA form. */ 2662 2663 timevar_push (TV_TO_SSA); 2664 open_dump_file (DFI_ssa, decl); 2665 2666 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2667 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP); 2668 convert_to_ssa (); 2669 2670 close_dump_file (DFI_ssa, print_rtl_with_bb, insns); 2671 timevar_pop (TV_TO_SSA); 2672 2673 /* Perform sparse conditional constant propagation, if requested. */ 2674 if (flag_ssa_ccp) 2675 { 2676 timevar_push (TV_SSA_CCP); 2677 open_dump_file (DFI_ssa_ccp, decl); 2678 2679 ssa_const_prop (); 2680 2681 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ()); 2682 timevar_pop (TV_SSA_CCP); 2683 } 2684 2685 /* It would be useful to cleanup the CFG at this point, but block 2686 merging and possibly other transformations might leave a PHI 2687 node in the middle of a basic block, which is a strict no-no. */ 2688 2689 /* The SSA implementation uses basic block numbers in its phi 2690 nodes. Thus, changing the control-flow graph or the basic 2691 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (), 2692 may cause problems. */ 2693 2694 if (flag_ssa_dce) 2695 { 2696 /* Remove dead code. */ 2697 2698 timevar_push (TV_SSA_DCE); 2699 open_dump_file (DFI_ssa_dce, decl); 2700 2701 insns = get_insns (); 2702 ssa_eliminate_dead_code(); 2703 2704 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns); 2705 timevar_pop (TV_SSA_DCE); 2706 } 2707 2708 /* Convert from SSA form. */ 2709 2710 timevar_push (TV_FROM_SSA); 2711 open_dump_file (DFI_ussa, decl); 2712 2713 convert_from_ssa (); 2714 /* New registers have been created. Rescan their usage. */ 2715 reg_scan (insns, max_reg_num (), 1); 2716 2717 close_dump_file (DFI_ussa, print_rtl_with_bb, insns); 2718 timevar_pop (TV_FROM_SSA); 2719 2720 ggc_collect (); 2721 /* CFG is no longer maintained up-to-date. */ 2722 free_bb_for_insn (); 2723 } 2724 2725 timevar_push (TV_JUMP); 2726 2727 if (optimize > 0) 2728 { 2729 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2730 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP 2731 | (flag_thread_jumps ? CLEANUP_THREADING : 0)); 2732 2733 /* ??? Run if-conversion before delete_null_pointer_checks, 2734 since the later does not preserve the CFG. This should 2735 be changed -- no since converting if's that are going to 2736 be deleted. */ 2737 timevar_push (TV_IFCVT); 2738 if_convert (0); 2739 timevar_pop (TV_IFCVT); 2740 2741 /* CFG is no longer maintained up-to-date. */ 2742 free_bb_for_insn (); 2743 /* Try to identify useless null pointer tests and delete them. */ 2744 if (flag_delete_null_pointer_checks) 2745 delete_null_pointer_checks (insns); 2746 } 2747 2748 /* Jump optimization, and the removal of NULL pointer checks, may 2749 have reduced the number of instructions substantially. CSE, and 2750 future passes, allocate arrays whose dimensions involve the 2751 maximum instruction UID, so if we can reduce the maximum UID 2752 we'll save big on memory. */ 2753 renumber_insns (rtl_dump_file); 2754 timevar_pop (TV_JUMP); 2755 2756 close_dump_file (DFI_jump, print_rtl, insns); 2757 2758 ggc_collect (); 2759 2760 /* Perform common subexpression elimination. 2761 Nonzero value from `cse_main' means that jumps were simplified 2762 and some code may now be unreachable, so do 2763 jump optimization again. */ 2764 2765 if (optimize > 0) 2766 { 2767 open_dump_file (DFI_cse, decl); 2768 timevar_push (TV_CSE); 2769 2770 reg_scan (insns, max_reg_num (), 1); 2771 2772 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file); 2773 2774 /* If we are not running more CSE passes, then we are no longer 2775 expecting CSE to be run. But always rerun it in a cheap mode. */ 2776 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse; 2777 2778 if (tem || optimize > 1) 2779 { 2780 timevar_push (TV_JUMP); 2781 rebuild_jump_labels (insns); 2782 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2783 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP); 2784 timevar_pop (TV_JUMP); 2785 /* CFG is no longer maintained up-to-date. */ 2786 free_bb_for_insn (); 2787 } 2788 2789 /* Run this after jump optmizations remove all the unreachable code 2790 so that unreachable code will not keep values live. */ 2791 delete_trivially_dead_insns (insns, max_reg_num (), 0); 2792 2793 /* Try to identify useless null pointer tests and delete them. */ 2794 if (flag_delete_null_pointer_checks || flag_thread_jumps) 2795 { 2796 timevar_push (TV_JUMP); 2797 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2798 2799 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP 2800 | (flag_thread_jumps ? CLEANUP_THREADING : 0)); 2801 2802 if (flag_delete_null_pointer_checks) 2803 delete_null_pointer_checks (insns); 2804 /* CFG is no longer maintained up-to-date. */ 2805 free_bb_for_insn (); 2806 timevar_pop (TV_JUMP); 2807 } 2808 2809 /* The second pass of jump optimization is likely to have 2810 removed a bunch more instructions. */ 2811 renumber_insns (rtl_dump_file); 2812 2813 timevar_pop (TV_CSE); 2814 close_dump_file (DFI_cse, print_rtl, insns); 2815 } 2816 2817 open_dump_file (DFI_addressof, decl); 2818 2819 purge_addressof (insns); 2820 reg_scan (insns, max_reg_num (), 1); 2821 2822 close_dump_file (DFI_addressof, print_rtl, insns); 2823 2824 ggc_collect (); 2825 2826 /* Perform global cse. */ 2827 2828 if (optimize > 0 && flag_gcse) 2829 { 2830 int save_csb, save_cfj; 2831 int tem2 = 0; 2832 2833 timevar_push (TV_GCSE); 2834 open_dump_file (DFI_gcse, decl); 2835 2836 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2837 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP); 2838 tem = gcse_main (insns, rtl_dump_file); 2839 rebuild_jump_labels (insns); 2840 2841 save_csb = flag_cse_skip_blocks; 2842 save_cfj = flag_cse_follow_jumps; 2843 flag_cse_skip_blocks = flag_cse_follow_jumps = 0; 2844 2845 /* CFG is no longer maintained up-to-date. */ 2846 free_bb_for_insn (); 2847 /* If -fexpensive-optimizations, re-run CSE to clean up things done 2848 by gcse. */ 2849 if (flag_expensive_optimizations) 2850 { 2851 timevar_push (TV_CSE); 2852 reg_scan (insns, max_reg_num (), 1); 2853 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file); 2854 timevar_pop (TV_CSE); 2855 cse_not_expected = !flag_rerun_cse_after_loop; 2856 } 2857 2858 /* If gcse or cse altered any jumps, rerun jump optimizations to clean 2859 things up. Then possibly re-run CSE again. */ 2860 while (tem || tem2) 2861 { 2862 tem = tem2 = 0; 2863 timevar_push (TV_JUMP); 2864 rebuild_jump_labels (insns); 2865 delete_trivially_dead_insns (insns, max_reg_num (), 0); 2866 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2867 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP); 2868 /* CFG is no longer maintained up-to-date. */ 2869 free_bb_for_insn (); 2870 timevar_pop (TV_JUMP); 2871 2872 if (flag_expensive_optimizations) 2873 { 2874 timevar_push (TV_CSE); 2875 reg_scan (insns, max_reg_num (), 1); 2876 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file); 2877 timevar_pop (TV_CSE); 2878 } 2879 } 2880 2881 close_dump_file (DFI_gcse, print_rtl, insns); 2882 timevar_pop (TV_GCSE); 2883 2884 ggc_collect (); 2885 flag_cse_skip_blocks = save_csb; 2886 flag_cse_follow_jumps = save_cfj; 2887 } 2888 2889 /* Move constant computations out of loops. */ 2890 2891 if (optimize > 0) 2892 { 2893 timevar_push (TV_LOOP); 2894 open_dump_file (DFI_loop, decl); 2895 free_bb_for_insn (); 2896 2897 if (flag_rerun_loop_opt) 2898 { 2899 cleanup_barriers (); 2900 2901 /* We only want to perform unrolling once. */ 2902 loop_optimize (insns, rtl_dump_file, LOOP_FIRST_PASS); 2903 2904 /* The first call to loop_optimize makes some instructions 2905 trivially dead. We delete those instructions now in the 2906 hope that doing so will make the heuristics in loop work 2907 better and possibly speed up compilation. */ 2908 delete_trivially_dead_insns (insns, max_reg_num (), 0); 2909 2910 /* The regscan pass is currently necessary as the alias 2911 analysis code depends on this information. */ 2912 reg_scan (insns, max_reg_num (), 1); 2913 } 2914 cleanup_barriers (); 2915 loop_optimize (insns, rtl_dump_file, 2916 (flag_unroll_loops ? LOOP_UNROLL : 0) | LOOP_BCT 2917 | (flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0)); 2918 2919 close_dump_file (DFI_loop, print_rtl, insns); 2920 timevar_pop (TV_LOOP); 2921 2922 ggc_collect (); 2923 } 2924 2925 if (optimize > 0) 2926 { 2927 timevar_push (TV_CSE2); 2928 open_dump_file (DFI_cse2, decl); 2929 2930 if (flag_rerun_cse_after_loop) 2931 { 2932 /* Running another jump optimization pass before the second 2933 cse pass sometimes simplifies the RTL enough to allow 2934 the second CSE pass to do a better job. Jump_optimize can change 2935 max_reg_num so we must rerun reg_scan afterwards. 2936 ??? Rework to not call reg_scan so often. */ 2937 timevar_push (TV_JUMP); 2938 2939 /* The previous call to loop_optimize makes some instructions 2940 trivially dead. We delete those instructions now in the 2941 hope that doing so will make the heuristics in jump work 2942 better and possibly speed up compilation. */ 2943 delete_trivially_dead_insns (insns, max_reg_num (), 0); 2944 2945 reg_scan (insns, max_reg_num (), 0); 2946 2947 timevar_push (TV_IFCVT); 2948 2949 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2950 cleanup_cfg (CLEANUP_EXPENSIVE); 2951 if_convert (0); 2952 2953 timevar_pop(TV_IFCVT); 2954 2955 timevar_pop (TV_JUMP); 2956 2957 /* CFG is no longer maintained up-to-date. */ 2958 free_bb_for_insn (); 2959 reg_scan (insns, max_reg_num (), 0); 2960 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file); 2961 2962 if (tem) 2963 { 2964 timevar_push (TV_JUMP); 2965 rebuild_jump_labels (insns); 2966 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2967 cleanup_cfg (CLEANUP_EXPENSIVE); 2968 /* CFG is no longer maintained up-to-date. */ 2969 free_bb_for_insn (); 2970 timevar_pop (TV_JUMP); 2971 } 2972 } 2973 2974 close_dump_file (DFI_cse2, print_rtl, insns); 2975 timevar_pop (TV_CSE2); 2976 2977 ggc_collect (); 2978 } 2979 2980 cse_not_expected = 1; 2981 2982 regclass_init (); 2983 2984 /* Do control and data flow analysis; wrote some of the results to 2985 the dump file. */ 2986 2987 timevar_push (TV_FLOW); 2988 open_dump_file (DFI_cfg, decl); 2989 2990 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2991 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) 2992 | (flag_thread_jumps ? CLEANUP_THREADING : 0)); 2993 check_function_return_warnings (); 2994 2995 /* It may make more sense to mark constant functions after dead code is 2996 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs 2997 may insert code making function non-constant, but we still must consider 2998 it as constant, otherwise -fbranch-probabilities will not read data back. 2999 3000 life_analyzis rarely eliminates modification of external memory. 3001 */ 3002 mark_constant_function (); 3003 3004 close_dump_file (DFI_cfg, print_rtl_with_bb, insns); 3005 3006 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities) 3007 { 3008 timevar_push (TV_BRANCH_PROB); 3009 open_dump_file (DFI_bp, decl); 3010 3011 branch_prob (); 3012 3013 close_dump_file (DFI_bp, print_rtl_with_bb, insns); 3014 timevar_pop (TV_BRANCH_PROB); 3015 } 3016 3017 open_dump_file (DFI_life, decl); 3018 if (optimize) 3019 { 3020 struct loops loops; 3021 3022 /* Discover and record the loop depth at the head of each basic 3023 block. The loop infrastructure does the real job for us. */ 3024 flow_loops_find (&loops, LOOP_TREE); 3025 3026 /* Estimate using heuristics if no profiling info is available. */ 3027 if (flag_guess_branch_prob) 3028 estimate_probability (&loops); 3029 3030 if (rtl_dump_file) 3031 flow_loops_dump (&loops, rtl_dump_file, NULL, 0); 3032 3033 flow_loops_free (&loops); 3034 } 3035 life_analysis (insns, rtl_dump_file, PROP_FINAL); 3036 timevar_pop (TV_FLOW); 3037 3038 no_new_pseudos = 1; 3039 3040 if (warn_uninitialized || extra_warnings) 3041 { 3042 uninitialized_vars_warning (DECL_INITIAL (decl)); 3043 if (extra_warnings) 3044 setjmp_args_warning (); 3045 } 3046 3047 if (optimize) 3048 { 3049 if (initialize_uninitialized_subregs ()) 3050 { 3051 /* Insns were inserted, so things might look a bit different. */ 3052 insns = get_insns (); 3053 life_analysis (insns, rtl_dump_file, 3054 (PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES)); 3055 } 3056 } 3057 3058 close_dump_file (DFI_life, print_rtl_with_bb, insns); 3059 3060 ggc_collect (); 3061 3062 /* If -opt, try combining insns through substitution. */ 3063 3064 if (optimize > 0) 3065 { 3066 int rebuild_jump_labels_after_combine = 0; 3067 3068 timevar_push (TV_COMBINE); 3069 open_dump_file (DFI_combine, decl); 3070 3071 rebuild_jump_labels_after_combine 3072 = combine_instructions (insns, max_reg_num ()); 3073 3074 /* Always purge dead edges, as we may eliminate an insn throwing 3075 exception. */ 3076 rebuild_jump_labels_after_combine |= purge_all_dead_edges (true); 3077 3078 /* Combining insns may have turned an indirect jump into a 3079 direct jump. Rebuid the JUMP_LABEL fields of jumping 3080 instructions. */ 3081 if (rebuild_jump_labels_after_combine) 3082 { 3083 timevar_push (TV_JUMP); 3084 rebuild_jump_labels (insns); 3085 timevar_pop (TV_JUMP); 3086 3087 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE); 3088 } 3089 3090 close_dump_file (DFI_combine, print_rtl_with_bb, insns); 3091 timevar_pop (TV_COMBINE); 3092 3093 ggc_collect (); 3094 } 3095 3096 /* Rerun if-conversion, as combine may have simplified things enough to 3097 now meet sequence length restrictions. */ 3098 if (optimize > 0) 3099 { 3100 timevar_push (TV_IFCVT); 3101 open_dump_file (DFI_ce, decl); 3102 3103 no_new_pseudos = 0; 3104 if_convert (1); 3105 no_new_pseudos = 1; 3106 3107 close_dump_file (DFI_ce, print_rtl_with_bb, insns); 3108 timevar_pop (TV_IFCVT); 3109 } 3110 3111 /* Register allocation pre-pass, to reduce number of moves 3112 necessary for two-address machines. */ 3113 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations)) 3114 { 3115 timevar_push (TV_REGMOVE); 3116 open_dump_file (DFI_regmove, decl); 3117 3118 regmove_optimize (insns, max_reg_num (), rtl_dump_file); 3119 3120 close_dump_file (DFI_regmove, print_rtl_with_bb, insns); 3121 timevar_pop (TV_REGMOVE); 3122 3123 ggc_collect (); 3124 } 3125 3126 /* Do unconditional splitting before register allocation to allow machine 3127 description to add extra information not needed previously. */ 3128 split_all_insns (1); 3129 3130 /* Any of the several passes since flow1 will have munged register 3131 lifetime data a bit. */ 3132 register_life_up_to_date = 0; 3133 3134#ifdef OPTIMIZE_MODE_SWITCHING 3135 timevar_push (TV_MODE_SWITCH); 3136 3137 no_new_pseudos = 0; 3138 if (optimize_mode_switching (NULL)) 3139 { 3140 /* We did work, and so had to regenerate global life information. 3141 Take advantage of this and don't re-recompute register life 3142 information below. */ 3143 register_life_up_to_date = 1; 3144 } 3145 no_new_pseudos = 1; 3146 3147 timevar_pop (TV_MODE_SWITCH); 3148#endif 3149 3150 timevar_push (TV_SCHED); 3151 3152#ifdef INSN_SCHEDULING 3153 3154 /* Print function header into sched dump now 3155 because doing the sched analysis makes some of the dump. */ 3156 if (optimize > 0 && flag_schedule_insns) 3157 { 3158 open_dump_file (DFI_sched, decl); 3159 3160 /* Do control and data sched analysis, 3161 and write some of the results to dump file. */ 3162 3163 schedule_insns (rtl_dump_file); 3164 3165 close_dump_file (DFI_sched, print_rtl_with_bb, insns); 3166 3167 /* Register lifetime information was updated as part of verifying 3168 the schedule. */ 3169 register_life_up_to_date = 1; 3170 } 3171#endif 3172 timevar_pop (TV_SCHED); 3173 3174 ggc_collect (); 3175 3176 /* Determine if the current function is a leaf before running reload 3177 since this can impact optimizations done by the prologue and 3178 epilogue thus changing register elimination offsets. */ 3179 current_function_is_leaf = leaf_function_p (); 3180 3181 timevar_push (TV_LOCAL_ALLOC); 3182 open_dump_file (DFI_lreg, decl); 3183 3184 /* Allocate pseudo-regs that are used only within 1 basic block. 3185 3186 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the 3187 jump optimizer after register allocation and reloading are finished. */ 3188 3189 if (! register_life_up_to_date) 3190 recompute_reg_usage (insns, ! optimize_size); 3191 3192 /* Allocate the reg_renumber array. */ 3193 allocate_reg_info (max_regno, FALSE, TRUE); 3194 3195 /* And the reg_equiv_memory_loc array. */ 3196 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx)); 3197 3198 allocate_initial_values (reg_equiv_memory_loc); 3199 3200 regclass (insns, max_reg_num (), rtl_dump_file); 3201 rebuild_label_notes_after_reload = local_alloc (); 3202 3203 timevar_pop (TV_LOCAL_ALLOC); 3204 3205 if (dump_file[DFI_lreg].enabled) 3206 { 3207 timevar_push (TV_DUMP); 3208 3209 dump_flow_info (rtl_dump_file); 3210 dump_local_alloc (rtl_dump_file); 3211 3212 close_dump_file (DFI_lreg, print_rtl_with_bb, insns); 3213 timevar_pop (TV_DUMP); 3214 } 3215 3216 ggc_collect (); 3217 3218 timevar_push (TV_GLOBAL_ALLOC); 3219 open_dump_file (DFI_greg, decl); 3220 3221 /* If optimizing, allocate remaining pseudo-regs. Do the reload 3222 pass fixing up any insns that are invalid. */ 3223 3224 if (optimize) 3225 failure = global_alloc (rtl_dump_file); 3226 else 3227 { 3228 build_insn_chain (insns); 3229 failure = reload (insns, 0); 3230 } 3231 3232 timevar_pop (TV_GLOBAL_ALLOC); 3233 3234 if (dump_file[DFI_greg].enabled) 3235 { 3236 timevar_push (TV_DUMP); 3237 3238 dump_global_regs (rtl_dump_file); 3239 3240 close_dump_file (DFI_greg, print_rtl_with_bb, insns); 3241 timevar_pop (TV_DUMP); 3242 } 3243 3244 if (failure) 3245 goto exit_rest_of_compilation; 3246 3247 ggc_collect (); 3248 3249 open_dump_file (DFI_postreload, decl); 3250 3251 /* Do a very simple CSE pass over just the hard registers. */ 3252 if (optimize > 0) 3253 { 3254 timevar_push (TV_RELOAD_CSE_REGS); 3255 reload_cse_regs (insns); 3256 timevar_pop (TV_RELOAD_CSE_REGS); 3257 } 3258 3259 /* Register allocation and reloading may have turned an indirect jump into 3260 a direct jump. If so, we must rebuild the JUMP_LABEL fields of 3261 jumping instructions. */ 3262 if (rebuild_label_notes_after_reload) 3263 { 3264 timevar_push (TV_JUMP); 3265 3266 rebuild_jump_labels (insns); 3267 3268 timevar_pop (TV_JUMP); 3269 } 3270 3271 close_dump_file (DFI_postreload, print_rtl_with_bb, insns); 3272 3273 /* Re-create the death notes which were deleted during reload. */ 3274 timevar_push (TV_FLOW2); 3275 open_dump_file (DFI_flow2, decl); 3276 3277#ifdef ENABLE_CHECKING 3278 verify_flow_info (); 3279#endif 3280 3281 /* If optimizing, then go ahead and split insns now. */ 3282 if (optimize > 0) 3283 split_all_insns (0); 3284 3285 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0); 3286 3287 /* On some machines, the prologue and epilogue code, or parts thereof, 3288 can be represented as RTL. Doing so lets us schedule insns between 3289 it and the rest of the code and also allows delayed branch 3290 scheduling to operate in the epilogue. */ 3291 thread_prologue_and_epilogue_insns (insns); 3292 3293 /* Cross-jumping is O(N^3) on the number of edges, thus trying to 3294 perform cross-jumping on flow graphs which have a high connectivity 3295 will take a long time. This is similar to the test to disable GCSE. */ 3296 cleanup_crossjump = CLEANUP_CROSSJUMP; 3297 if (n_basic_blocks > 1000 && n_edges / n_basic_blocks >= 20) 3298 { 3299 if (optimize && warn_disabled_optimization) 3300 warning ("crossjump disabled: %d > 1000 basic blocks and %d >= 20 edges/basic block", 3301 n_basic_blocks, n_edges / n_basic_blocks); 3302 cleanup_crossjump = 0; 3303 } 3304 3305 if (optimize) 3306 { 3307 cleanup_cfg (CLEANUP_EXPENSIVE | cleanup_crossjump); 3308 life_analysis (insns, rtl_dump_file, PROP_FINAL); 3309 3310 /* This is kind of a heuristic. We need to run combine_stack_adjustments 3311 even for machines with possibly nonzero RETURN_POPS_ARGS 3312 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having 3313 push instructions will have popping returns. */ 3314#ifndef PUSH_ROUNDING 3315 if (!ACCUMULATE_OUTGOING_ARGS) 3316#endif 3317 combine_stack_adjustments (); 3318 3319 ggc_collect (); 3320 } 3321 3322 flow2_completed = 1; 3323 3324 close_dump_file (DFI_flow2, print_rtl_with_bb, insns); 3325 timevar_pop (TV_FLOW2); 3326 3327#ifdef HAVE_peephole2 3328 if (optimize > 0 && flag_peephole2) 3329 { 3330 timevar_push (TV_PEEPHOLE2); 3331 open_dump_file (DFI_peephole2, decl); 3332 3333 peephole2_optimize (rtl_dump_file); 3334 3335 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns); 3336 timevar_pop (TV_PEEPHOLE2); 3337 } 3338#endif 3339 3340 if (optimize > 0 && (flag_rename_registers || flag_cprop_registers)) 3341 { 3342 timevar_push (TV_RENAME_REGISTERS); 3343 open_dump_file (DFI_rnreg, decl); 3344 3345 if (flag_rename_registers) 3346 regrename_optimize (); 3347 if (flag_cprop_registers) 3348 copyprop_hardreg_forward (); 3349 3350 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns); 3351 timevar_pop (TV_RENAME_REGISTERS); 3352 } 3353 3354 if (optimize > 0) 3355 { 3356 timevar_push (TV_IFCVT2); 3357 open_dump_file (DFI_ce2, decl); 3358 3359 if_convert (1); 3360 3361 close_dump_file (DFI_ce2, print_rtl_with_bb, insns); 3362 timevar_pop (TV_IFCVT2); 3363 } 3364#ifdef STACK_REGS 3365 if (optimize) 3366 split_all_insns (1); 3367#endif 3368 3369#ifdef INSN_SCHEDULING 3370 if (optimize > 0 && flag_schedule_insns_after_reload) 3371 { 3372 timevar_push (TV_SCHED2); 3373 open_dump_file (DFI_sched2, decl); 3374 3375 /* Do control and data sched analysis again, 3376 and write some more of the results to dump file. */ 3377 3378 split_all_insns (1); 3379 3380 schedule_insns (rtl_dump_file); 3381 3382 close_dump_file (DFI_sched2, print_rtl_with_bb, insns); 3383 timevar_pop (TV_SCHED2); 3384 3385 ggc_collect (); 3386 } 3387#endif 3388 3389#ifdef LEAF_REGISTERS 3390 current_function_uses_only_leaf_regs 3391 = optimize > 0 && only_leaf_regs_used () && leaf_function_p (); 3392#endif 3393 3394#ifdef STACK_REGS 3395 timevar_push (TV_REG_STACK); 3396 open_dump_file (DFI_stack, decl); 3397 3398 reg_to_stack (insns, rtl_dump_file); 3399 3400 close_dump_file (DFI_stack, print_rtl_with_bb, insns); 3401 timevar_pop (TV_REG_STACK); 3402 3403 ggc_collect (); 3404#endif 3405 if (optimize > 0) 3406 { 3407 timevar_push (TV_REORDER_BLOCKS); 3408 open_dump_file (DFI_bbro, decl); 3409 3410 /* Last attempt to optimize CFG, as life analysis possibly removed 3411 some instructions. Note that we can't rerun crossjump at this 3412 point, because it can turn a switch into a direct branch, which 3413 can leave the tablejump address calculation in the code, which 3414 can lead to referencing an undefined label. */ 3415 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK); 3416 if (flag_reorder_blocks) 3417 { 3418 reorder_basic_blocks (); 3419 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK); 3420 } 3421 3422 close_dump_file (DFI_bbro, print_rtl_with_bb, insns); 3423 timevar_pop (TV_REORDER_BLOCKS); 3424 } 3425 compute_alignments (); 3426 3427 /* CFG is no longer maintained up-to-date. */ 3428 free_bb_for_insn (); 3429 3430 /* If a machine dependent reorganization is needed, call it. */ 3431#ifdef MACHINE_DEPENDENT_REORG 3432 timevar_push (TV_MACH_DEP); 3433 open_dump_file (DFI_mach, decl); 3434 3435 MACHINE_DEPENDENT_REORG (insns); 3436 3437 close_dump_file (DFI_mach, print_rtl, insns); 3438 timevar_pop (TV_MACH_DEP); 3439 3440 ggc_collect (); 3441#endif 3442 3443 purge_line_number_notes (insns); 3444 cleanup_barriers (); 3445 3446 /* If a scheduling pass for delayed branches is to be done, 3447 call the scheduling code. */ 3448 3449#ifdef DELAY_SLOTS 3450 if (optimize > 0 && flag_delayed_branch) 3451 { 3452 timevar_push (TV_DBR_SCHED); 3453 open_dump_file (DFI_dbr, decl); 3454 3455 dbr_schedule (insns, rtl_dump_file); 3456 3457 close_dump_file (DFI_dbr, print_rtl, insns); 3458 timevar_pop (TV_DBR_SCHED); 3459 3460 ggc_collect (); 3461 } 3462#endif 3463 3464#if defined (HAVE_ATTR_length) && !defined (STACK_REGS) 3465 timevar_push (TV_SHORTEN_BRANCH); 3466 split_all_insns_noflow (); 3467 timevar_pop (TV_SHORTEN_BRANCH); 3468#endif 3469 3470 convert_to_eh_region_ranges (); 3471 3472 /* Shorten branches. */ 3473 timevar_push (TV_SHORTEN_BRANCH); 3474 shorten_branches (get_insns ()); 3475 timevar_pop (TV_SHORTEN_BRANCH); 3476 3477 current_function_nothrow = nothrow_function_p (); 3478 if (current_function_nothrow) 3479 /* Now we know that this can't throw; set the flag for the benefit 3480 of other functions later in this translation unit. */ 3481 TREE_NOTHROW (current_function_decl) = 1; 3482 3483 /* Now turn the rtl into assembler code. */ 3484 3485 timevar_push (TV_FINAL); 3486 { 3487 rtx x; 3488 const char *fnname; 3489 3490 /* Get the function's name, as described by its RTL. This may be 3491 different from the DECL_NAME name used in the source file. */ 3492 3493 x = DECL_RTL (decl); 3494 if (GET_CODE (x) != MEM) 3495 abort (); 3496 x = XEXP (x, 0); 3497 if (GET_CODE (x) != SYMBOL_REF) 3498 abort (); 3499 fnname = XSTR (x, 0); 3500 3501 assemble_start_function (decl, fnname); 3502 final_start_function (insns, asm_out_file, optimize); 3503 final (insns, asm_out_file, optimize, 0); 3504 final_end_function (); 3505 3506#ifdef IA64_UNWIND_INFO 3507 /* ??? The IA-64 ".handlerdata" directive must be issued before 3508 the ".endp" directive that closes the procedure descriptor. */ 3509 output_function_exception_table (); 3510#endif 3511 3512 assemble_end_function (decl, fnname); 3513 3514#ifndef IA64_UNWIND_INFO 3515 /* Otherwise, it feels unclean to switch sections in the middle. */ 3516 output_function_exception_table (); 3517#endif 3518 3519 if (! quiet_flag) 3520 fflush (asm_out_file); 3521 3522 /* Release all memory allocated by flow. */ 3523 free_basic_block_vars (0); 3524 3525 /* Release all memory held by regsets now. */ 3526 regset_release_memory (); 3527 } 3528 timevar_pop (TV_FINAL); 3529 3530 ggc_collect (); 3531 3532 /* Write DBX symbols if requested. */ 3533 3534 /* Note that for those inline functions where we don't initially 3535 know for certain that we will be generating an out-of-line copy, 3536 the first invocation of this routine (rest_of_compilation) will 3537 skip over this code by doing a `goto exit_rest_of_compilation;'. 3538 Later on, finish_compilation will call rest_of_compilation again 3539 for those inline functions that need to have out-of-line copies 3540 generated. During that call, we *will* be routed past here. */ 3541 3542 timevar_push (TV_SYMOUT); 3543 (*debug_hooks->function_decl) (decl); 3544 timevar_pop (TV_SYMOUT); 3545 3546 exit_rest_of_compilation: 3547 3548 /* In case the function was not output, 3549 don't leave any temporary anonymous types 3550 queued up for sdb output. */ 3551#ifdef SDB_DEBUGGING_INFO 3552 if (write_symbols == SDB_DEBUG) 3553 sdbout_types (NULL_TREE); 3554#endif 3555 3556 reload_completed = 0; 3557 flow2_completed = 0; 3558 no_new_pseudos = 0; 3559 3560 timevar_push (TV_FINAL); 3561 3562 /* Clear out the insn_length contents now that they are no 3563 longer valid. */ 3564 init_insn_lengths (); 3565 3566 /* Clear out the real_constant_chain before some of the rtx's 3567 it runs through become garbage. */ 3568 clear_const_double_mem (); 3569 3570 /* Show no temporary slots allocated. */ 3571 init_temp_slots (); 3572 3573 free_basic_block_vars (0); 3574 free_bb_for_insn (); 3575 3576 timevar_pop (TV_FINAL); 3577 3578 /* Make sure volatile mem refs aren't considered valid operands for 3579 arithmetic insns. We must call this here if this is a nested inline 3580 function, since the above code leaves us in the init_recog state 3581 (from final.c), and the function context push/pop code does not 3582 save/restore volatile_ok. 3583 3584 ??? Maybe it isn't necessary for expand_start_function to call this 3585 anymore if we do it here? */ 3586 3587 init_recog_no_volatile (); 3588 3589 /* We're done with this function. Free up memory if we can. */ 3590 free_after_parsing (cfun); 3591 if (! DECL_DEFER_OUTPUT (decl)) 3592 { 3593 free_after_compilation (cfun); 3594 3595 /* Clear integrate.c's pointer to the cfun structure we just 3596 destroyed. */ 3597 DECL_SAVED_INSNS (decl) = 0; 3598 } 3599 cfun = 0; 3600 3601 ggc_collect (); 3602 3603 timevar_pop (TV_REST_OF_COMPILATION); 3604} 3605 3606static void 3607display_help () 3608{ 3609 int undoc; 3610 unsigned long i; 3611 const char *lang; 3612 3613 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n")); 3614 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n")); 3615 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n")); 3616 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n")); 3617 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n")); 3618 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")); 3619 3620 for (i = ARRAY_SIZE (f_options); i--;) 3621 { 3622 const char *description = f_options[i].description; 3623 3624 if (description != NULL && * description != 0) 3625 printf (" -f%-21s %s\n", 3626 f_options[i].string, _(description)); 3627 } 3628 3629 printf (_(" -O[number] Set optimization level to [number]\n")); 3630 printf (_(" -Os Optimize for space rather than speed\n")); 3631 for (i = LAST_PARAM; i--;) 3632 { 3633 const char *description = compiler_params[i].help; 3634 const int length = 21-strlen(compiler_params[i].option); 3635 3636 if (description != NULL && * description != 0) 3637 printf (" --param %s=<value>%.*s%s\n", 3638 compiler_params[i].option, 3639 length > 0 ? length : 1, " ", 3640 _(description)); 3641 } 3642 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n")); 3643 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n")); 3644 printf (_(" -w Suppress warnings\n")); 3645 printf (_(" -W Enable extra warnings\n")); 3646 3647 for (i = ARRAY_SIZE (W_options); i--;) 3648 { 3649 const char *description = W_options[i].description; 3650 3651 if (description != NULL && * description != 0) 3652 printf (" -W%-21s %s\n", 3653 W_options[i].string, _(description)); 3654 } 3655 3656 printf (_(" -Wunused Enable unused warnings\n")); 3657 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n")); 3658 printf (_(" -p Enable function profiling\n")); 3659 printf (_(" -o <file> Place output into <file> \n")); 3660 printf (_("\ 3661 -G <number> Put global and static data smaller than <number>\n\ 3662 bytes into a special section (on some targets)\n")); 3663 3664 for (i = ARRAY_SIZE (debug_args); i--;) 3665 { 3666 if (debug_args[i].description != NULL) 3667 printf (" -g%-21s %s\n", 3668 debug_args[i].arg, _(debug_args[i].description)); 3669 } 3670 3671 printf (_(" -aux-info <file> Emit declaration info into <file>\n")); 3672 printf (_(" -quiet Do not display functions compiled or elapsed time\n")); 3673 printf (_(" -version Display the compiler's version\n")); 3674 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n")); 3675 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n")); 3676#if defined INSN_SCHEDULING 3677 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n")); 3678#endif 3679 printf (_(" --help Display this information\n")); 3680 3681 undoc = 0; 3682 lang = "language"; 3683 3684 /* Display descriptions of language specific options. 3685 If there is no description, note that there is an undocumented option. 3686 If the description is empty, do not display anything. (This allows 3687 options to be deliberately undocumented, for whatever reason). 3688 If the option string is missing, then this is a marker, indicating 3689 that the description string is in fact the name of a language, whose 3690 language specific options are to follow. */ 3691 3692 if (ARRAY_SIZE (documented_lang_options) > 1) 3693 { 3694 printf (_("\nLanguage specific options:\n")); 3695 3696 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++) 3697 { 3698 const char *description = documented_lang_options[i].description; 3699 const char *option = documented_lang_options[i].option; 3700 3701 if (description == NULL) 3702 { 3703 undoc = 1; 3704 3705 if (extra_warnings) 3706 printf (_(" %-23.23s [undocumented]\n"), option); 3707 } 3708 else if (*description == 0) 3709 continue; 3710 else if (option == NULL) 3711 { 3712 if (undoc) 3713 printf 3714 (_("\nThere are undocumented %s specific options as well.\n"), 3715 lang); 3716 undoc = 0; 3717 3718 printf (_("\n Options for %s:\n"), description); 3719 3720 lang = description; 3721 } 3722 else 3723 printf (" %-23.23s %s\n", option, _(description)); 3724 } 3725 } 3726 3727 if (undoc) 3728 printf (_("\nThere are undocumented %s specific options as well.\n"), 3729 lang); 3730 3731 display_target_options (); 3732} 3733 3734static void 3735display_target_options () 3736{ 3737 int undoc, i; 3738 static bool displayed = false; 3739 3740 /* Avoid double printing for --help --target-help. */ 3741 if (displayed) 3742 return; 3743 displayed = true; 3744 3745 if (ARRAY_SIZE (target_switches) > 1 3746#ifdef TARGET_OPTIONS 3747 || ARRAY_SIZE (target_options) > 1 3748#endif 3749 ) 3750 { 3751 int doc = 0; 3752 3753 undoc = 0; 3754 3755 printf (_("\nTarget specific options:\n")); 3756 3757 for (i = ARRAY_SIZE (target_switches); i--;) 3758 { 3759 const char *option = target_switches[i].name; 3760 const char *description = target_switches[i].description; 3761 3762 if (option == NULL || *option == 0) 3763 continue; 3764 else if (description == NULL) 3765 { 3766 undoc = 1; 3767 3768 if (extra_warnings) 3769 printf (_(" -m%-23.23s [undocumented]\n"), option); 3770 } 3771 else if (* description != 0) 3772 doc += printf (" -m%-23.23s %s\n", option, _(description)); 3773 } 3774 3775#ifdef TARGET_OPTIONS 3776 for (i = ARRAY_SIZE (target_options); i--;) 3777 { 3778 const char *option = target_options[i].prefix; 3779 const char *description = target_options[i].description; 3780 3781 if (option == NULL || *option == 0) 3782 continue; 3783 else if (description == NULL) 3784 { 3785 undoc = 1; 3786 3787 if (extra_warnings) 3788 printf (_(" -m%-23.23s [undocumented]\n"), option); 3789 } 3790 else if (* description != 0) 3791 doc += printf (" -m%-23.23s %s\n", option, _(description)); 3792 } 3793#endif 3794 if (undoc) 3795 { 3796 if (doc) 3797 printf (_("\nThere are undocumented target specific options as well.\n")); 3798 else 3799 printf (_(" They exist, but they are not documented.\n")); 3800 } 3801 } 3802} 3803 3804/* Parse a -d... command line switch. */ 3805 3806static void 3807decode_d_option (arg) 3808 const char *arg; 3809{ 3810 int i, c, matched; 3811 3812 while (*arg) 3813 switch (c = *arg++) 3814 { 3815 case 'a': 3816 for (i = 0; i < (int) DFI_MAX; ++i) 3817 dump_file[i].enabled = 1; 3818 break; 3819 case 'A': 3820 flag_debug_asm = 1; 3821 break; 3822 case 'p': 3823 flag_print_asm_name = 1; 3824 break; 3825 case 'P': 3826 flag_dump_rtl_in_asm = 1; 3827 flag_print_asm_name = 1; 3828 break; 3829 case 'v': 3830 graph_dump_format = vcg; 3831 break; 3832 case 'x': 3833 rtl_dump_and_exit = 1; 3834 break; 3835 case 'y': 3836 (*lang_hooks.set_yydebug) (1); 3837 break; 3838 case 'D': /* These are handled by the preprocessor. */ 3839 case 'I': 3840 break; 3841 3842 default: 3843 matched = 0; 3844 for (i = 0; i < (int) DFI_MAX; ++i) 3845 if (c == dump_file[i].debug_switch) 3846 { 3847 dump_file[i].enabled = 1; 3848 matched = 1; 3849 } 3850 3851 if (! matched) 3852 warning ("unrecognized gcc debugging option: %c", c); 3853 break; 3854 } 3855} 3856 3857/* Parse a -f... command line switch. ARG is the value after the -f. 3858 It is safe to access 'ARG - 2' to generate the full switch name. 3859 Return the number of strings consumed. */ 3860 3861static int 3862decode_f_option (arg) 3863 const char *arg; 3864{ 3865 int j; 3866 const char *option_value = NULL; 3867 3868 /* Search for the option in the table of binary f options. */ 3869 for (j = ARRAY_SIZE (f_options); j--;) 3870 { 3871 if (!strcmp (arg, f_options[j].string)) 3872 { 3873 *f_options[j].variable = f_options[j].on_value; 3874 return 1; 3875 } 3876 3877 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-' 3878 && ! strcmp (arg + 3, f_options[j].string)) 3879 { 3880 *f_options[j].variable = ! f_options[j].on_value; 3881 return 1; 3882 } 3883 } 3884 3885 if (!strcmp (arg, "fast-math")) 3886 set_fast_math_flags (); 3887 else if (!strcmp (arg, "no-fast-math")) 3888 set_no_fast_math_flags (); 3889 else if ((option_value = skip_leading_substring (arg, "inline-limit-")) 3890 || (option_value = skip_leading_substring (arg, "inline-limit="))) 3891 { 3892 int val = 3893 read_integral_parameter (option_value, arg - 2, 3894 MAX_INLINE_INSNS); 3895 set_param_value ("max-inline-insns", val); 3896 } 3897#ifdef INSN_SCHEDULING 3898 else if ((option_value = skip_leading_substring (arg, "sched-verbose="))) 3899 fix_sched_param ("verbose", option_value); 3900#endif 3901 else if ((option_value = skip_leading_substring (arg, "fixed-"))) 3902 fix_register (option_value, 1, 1); 3903 else if ((option_value = skip_leading_substring (arg, "call-used-"))) 3904 fix_register (option_value, 0, 1); 3905 else if ((option_value = skip_leading_substring (arg, "call-saved-"))) 3906 fix_register (option_value, 0, 0); 3907 else if ((option_value = skip_leading_substring (arg, "align-loops="))) 3908 align_loops = read_integral_parameter (option_value, arg - 2, align_loops); 3909 else if ((option_value = skip_leading_substring (arg, "align-functions="))) 3910 align_functions 3911 = read_integral_parameter (option_value, arg - 2, align_functions); 3912 else if ((option_value = skip_leading_substring (arg, "align-jumps="))) 3913 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps); 3914 else if ((option_value = skip_leading_substring (arg, "align-labels="))) 3915 align_labels 3916 = read_integral_parameter (option_value, arg - 2, align_labels); 3917 else if ((option_value 3918 = skip_leading_substring (arg, "stack-limit-register="))) 3919 { 3920 int reg = decode_reg_name (option_value); 3921 if (reg < 0) 3922 error ("unrecognized register name `%s'", option_value); 3923 else 3924 stack_limit_rtx = gen_rtx_REG (Pmode, reg); 3925 } 3926 else if ((option_value 3927 = skip_leading_substring (arg, "stack-limit-symbol="))) 3928 { 3929 const char *nm; 3930 nm = ggc_strdup (option_value); 3931 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm); 3932 } 3933 else if ((option_value 3934 = skip_leading_substring (arg, "message-length="))) 3935 output_set_maximum_length 3936 (&global_dc->buffer, read_integral_parameter 3937 (option_value, arg - 2, diagnostic_line_cutoff (global_dc))); 3938 else if ((option_value 3939 = skip_leading_substring (arg, "diagnostics-show-location="))) 3940 { 3941 if (!strcmp (option_value, "once")) 3942 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE; 3943 else if (!strcmp (option_value, "every-line")) 3944 diagnostic_prefixing_rule (global_dc) 3945 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE; 3946 else 3947 error ("unrecognized option `%s'", arg - 2); 3948 } 3949 else if (!strcmp (arg, "no-stack-limit")) 3950 stack_limit_rtx = NULL_RTX; 3951 else if (!strcmp (arg, "preprocessed")) 3952 /* Recognise this switch but do nothing. This prevents warnings 3953 about an unrecognized switch if cpplib has not been linked in. */ 3954 ; 3955 else 3956 return 0; 3957 3958 return 1; 3959} 3960 3961/* Parse a -W... command line switch. ARG is the value after the -W. 3962 It is safe to access 'ARG - 2' to generate the full switch name. 3963 Return the number of strings consumed. */ 3964 3965static int 3966decode_W_option (arg) 3967 const char *arg; 3968{ 3969 const char *option_value = NULL; 3970 int j; 3971 3972 /* Search for the option in the table of binary W options. */ 3973 3974 for (j = ARRAY_SIZE (W_options); j--;) 3975 { 3976 if (!strcmp (arg, W_options[j].string)) 3977 { 3978 *W_options[j].variable = W_options[j].on_value; 3979 return 1; 3980 } 3981 3982 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-' 3983 && ! strcmp (arg + 3, W_options[j].string)) 3984 { 3985 *W_options[j].variable = ! W_options[j].on_value; 3986 return 1; 3987 } 3988 } 3989 3990 if ((option_value = skip_leading_substring (arg, "id-clash-"))) 3991 warning ("-Wid-clash-LEN is no longer supported"); 3992 else if ((option_value = skip_leading_substring (arg, "larger-than-"))) 3993 { 3994 larger_than_size = read_integral_parameter (option_value, arg - 2, -1); 3995 3996 warn_larger_than = larger_than_size != -1; 3997 } 3998 else if (!strcmp (arg, "unused")) 3999 { 4000 set_Wunused (1); 4001 } 4002 else if (!strcmp (arg, "no-unused")) 4003 { 4004 set_Wunused (0); 4005 } 4006 else 4007 return 0; 4008 4009 return 1; 4010} 4011 4012/* Parse a -g... command line switch. ARG is the value after the -g. 4013 It is safe to access 'ARG - 2' to generate the full switch name. 4014 Return the number of strings consumed. */ 4015 4016static int 4017decode_g_option (arg) 4018 const char *arg; 4019{ 4020 static unsigned level=0; 4021 /* A lot of code assumes write_symbols == NO_DEBUG if the 4022 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track 4023 of what debugging type has been selected). This records the 4024 selected type. It is an error to specify more than one 4025 debugging type. */ 4026 static enum debug_info_type selected_debug_type = NO_DEBUG; 4027 /* Non-zero if debugging format has been explicitly set. 4028 -g and -ggdb don't explicitly set the debugging format so 4029 -gdwarf -g3 is equivalent to -gdwarf3. */ 4030 static int type_explicitly_set_p = 0; 4031 /* Indexed by enum debug_info_type. */ 4032 static const char *const debug_type_names[] = 4033 { 4034 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms" 4035 }; 4036 4037 /* The maximum admissible debug level value. */ 4038 static const unsigned max_debug_level = 3; 4039 4040 /* Look up ARG in the table. */ 4041 for (da = debug_args; da->arg; da++) 4042 { 4043 const int da_len = strlen (da->arg); 4044 4045 if (da_len == 0 || ! strncmp (arg, da->arg, da_len)) 4046 { 4047 enum debug_info_type type = da->debug_type; 4048 const char *p = arg + da_len; 4049 4050 if (*p && ! ISDIGIT (*p)) 4051 continue; 4052 4053 /* A debug flag without a level defaults to level 2. 4054 Note we do not want to call read_integral_parameter 4055 for that case since it will call atoi which 4056 will return zero. 4057 4058 ??? We may want to generalize the interface to 4059 read_integral_parameter to better handle this case 4060 if this case shows up often. */ 4061 if (*p) 4062 level = read_integral_parameter (p, 0, max_debug_level + 1); 4063 else 4064 level = (level == 0) ? 2 : level; 4065 4066 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len)) 4067 { 4068 error ("use -gdwarf -g%d for DWARF v1, level %d", 4069 level, level); 4070 if (level == 2) 4071 error ("use -gdwarf-2 for DWARF v2"); 4072 } 4073 4074 if (level > max_debug_level) 4075 { 4076 warning ("\ 4077ignoring option `%s' due to invalid debug level specification", 4078 arg - 2); 4079 level = debug_info_level; 4080 } 4081 4082 if (type == NO_DEBUG) 4083 { 4084 type = PREFERRED_DEBUGGING_TYPE; 4085 4086 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0) 4087 { 4088#ifdef DWARF2_DEBUGGING_INFO 4089 type = DWARF2_DEBUG; 4090#else 4091#ifdef DBX_DEBUGGING_INFO 4092 type = DBX_DEBUG; 4093#endif 4094#endif 4095 } 4096 } 4097 4098 if (type == NO_DEBUG) 4099 warning ("`%s': unknown or unsupported -g option", arg - 2); 4100 4101 /* Does it conflict with an already selected type? */ 4102 if (type_explicitly_set_p 4103 /* -g/-ggdb don't conflict with anything. */ 4104 && da->debug_type != NO_DEBUG 4105 && type != selected_debug_type) 4106 warning ("`%s' ignored, conflicts with `-g%s'", 4107 arg - 2, debug_type_names[(int) selected_debug_type]); 4108 else 4109 { 4110 /* If the format has already been set, -g/-ggdb 4111 only change the debug level. */ 4112 if (type_explicitly_set_p && da->debug_type == NO_DEBUG) 4113 /* Don't change debugging type. */ 4114 ; 4115 else 4116 { 4117 selected_debug_type = type; 4118 type_explicitly_set_p = da->debug_type != NO_DEBUG; 4119 } 4120 4121 write_symbols = (level == 0 4122 ? NO_DEBUG 4123 : selected_debug_type); 4124 use_gnu_debug_info_extensions = da->use_extensions_p; 4125 debug_info_level = (enum debug_info_level) level; 4126 } 4127 4128 break; 4129 } 4130 } 4131 4132 if (! da->arg) 4133 return 0; 4134 4135 return 1; 4136} 4137 4138/* Decode the first argument in the argv as a language-independent option. 4139 Return the number of strings consumed. */ 4140 4141static unsigned int 4142independent_decode_option (argc, argv) 4143 int argc; 4144 char **argv; 4145{ 4146 char *arg = argv[0]; 4147 4148 if (arg[0] != '-' || arg[1] == 0) 4149 { 4150 if (arg[0] == '+') 4151 return 0; 4152 4153 filename = arg; 4154 4155 return 1; 4156 } 4157 4158 arg++; 4159 4160 if (!strcmp (arg, "-help")) 4161 { 4162 display_help (); 4163 exit_after_options = 1; 4164 } 4165 4166 if (!strcmp (arg, "-target-help")) 4167 { 4168 display_target_options (); 4169 exit_after_options = 1; 4170 } 4171 4172 if (!strcmp (arg, "-version")) 4173 { 4174 print_version (stderr, ""); 4175 exit_after_options = 1; 4176 } 4177 4178 /* Handle '--param <name>=<value>'. */ 4179 if (strcmp (arg, "-param") == 0) 4180 { 4181 char *equal; 4182 4183 if (argc == 1) 4184 { 4185 error ("-param option missing argument"); 4186 return 1; 4187 } 4188 4189 /* Get the '<name>=<value>' parameter. */ 4190 arg = argv[1]; 4191 /* Look for the `='. */ 4192 equal = strchr (arg, '='); 4193 if (!equal) 4194 error ("invalid --param option: %s", arg); 4195 else 4196 { 4197 int val; 4198 4199 /* Zero out the `=' sign so that we get two separate strings. */ 4200 *equal = '\0'; 4201 /* Figure out what value is specified. */ 4202 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL); 4203 if (val != INVALID_PARAM_VAL) 4204 set_param_value (arg, val); 4205 else 4206 error ("invalid parameter value `%s'", equal + 1); 4207 } 4208 4209 return 2; 4210 } 4211 4212 if (*arg == 'Y') 4213 arg++; 4214 4215 switch (*arg) 4216 { 4217 default: 4218 return 0; 4219 4220 case 'O': 4221 /* Already been treated in main (). Do nothing. */ 4222 break; 4223 4224 case 'm': 4225 set_target_switch (arg + 1); 4226 break; 4227 4228 case 'f': 4229 return decode_f_option (arg + 1); 4230 4231 case 'g': 4232 return decode_g_option (arg + 1); 4233 4234 case 'd': 4235 if (!strcmp (arg, "dumpbase")) 4236 { 4237 if (argc == 1) 4238 return 0; 4239 4240 dump_base_name = argv[1]; 4241 return 2; 4242 } 4243 else 4244 decode_d_option (arg + 1); 4245 break; 4246 4247 case 'p': 4248 if (!strcmp (arg, "pedantic")) 4249 pedantic = 1; 4250 else if (!strcmp (arg, "pedantic-errors")) 4251 flag_pedantic_errors = pedantic = 1; 4252 else if (arg[1] == 0) 4253 profile_flag = 1; 4254 else 4255 return 0; 4256 break; 4257 4258 case 'q': 4259 if (!strcmp (arg, "quiet")) 4260 quiet_flag = 1; 4261 else 4262 return 0; 4263 break; 4264 4265 case 'v': 4266 if (!strcmp (arg, "version")) 4267 version_flag = 1; 4268 else 4269 return 0; 4270 break; 4271 4272 case 'w': 4273 if (arg[1] == 0) 4274 inhibit_warnings = 1; 4275 else 4276 return 0; 4277 break; 4278 4279 case 'W': 4280 if (arg[1] == 0) 4281 { 4282 extra_warnings = 1; 4283 /* We save the value of warn_uninitialized, since if they put 4284 -Wuninitialized on the command line, we need to generate a 4285 warning about not using it without also specifying -O. */ 4286 if (warn_uninitialized != 1) 4287 warn_uninitialized = 2; 4288 } 4289 else 4290 return decode_W_option (arg + 1); 4291 break; 4292 4293 case 'a': 4294 if (!strncmp (arg, "aux-info", 8)) 4295 { 4296 if (arg[8] == '\0') 4297 { 4298 if (argc == 1) 4299 return 0; 4300 4301 aux_info_file_name = argv[1]; 4302 flag_gen_aux_info = 1; 4303 return 2; 4304 } 4305 else if (arg[8] == '=') 4306 { 4307 aux_info_file_name = arg + 9; 4308 flag_gen_aux_info = 1; 4309 } 4310 else 4311 return 0; 4312 } 4313 else 4314 return 0; 4315 break; 4316 4317 case 'o': 4318 if (arg[1] == 0) 4319 { 4320 if (argc == 1) 4321 return 0; 4322 4323 asm_file_name = argv[1]; 4324 return 2; 4325 } 4326 return 0; 4327 4328 case 'G': 4329 { 4330 int g_switch_val; 4331 int return_val; 4332 4333 if (arg[1] == 0) 4334 { 4335 if (argc == 1) 4336 return 0; 4337 4338 g_switch_val = read_integral_parameter (argv[1], 0, -1); 4339 return_val = 2; 4340 } 4341 else 4342 { 4343 g_switch_val = read_integral_parameter (arg + 1, 0, -1); 4344 return_val = 1; 4345 } 4346 4347 if (g_switch_val == -1) 4348 return_val = 0; 4349 else 4350 { 4351 g_switch_set = TRUE; 4352 g_switch_value = g_switch_val; 4353 } 4354 4355 return return_val; 4356 } 4357 } 4358 4359 return 1; 4360} 4361 4362/* Decode -m switches. */ 4363/* Decode the switch -mNAME. */ 4364 4365static void 4366set_target_switch (name) 4367 const char *name; 4368{ 4369 size_t j; 4370 int valid_target_option = 0; 4371 4372 for (j = 0; j < ARRAY_SIZE (target_switches); j++) 4373 if (!strcmp (target_switches[j].name, name)) 4374 { 4375 if (target_switches[j].value < 0) 4376 target_flags &= ~-target_switches[j].value; 4377 else 4378 target_flags |= target_switches[j].value; 4379 valid_target_option = 1; 4380 } 4381 4382#ifdef TARGET_OPTIONS 4383 if (!valid_target_option) 4384 for (j = 0; j < ARRAY_SIZE (target_options); j++) 4385 { 4386 int len = strlen (target_options[j].prefix); 4387 if (!strncmp (target_options[j].prefix, name, len)) 4388 { 4389 *target_options[j].variable = name + len; 4390 valid_target_option = 1; 4391 } 4392 } 4393#endif 4394 4395 if (!valid_target_option) 4396 error ("invalid option `%s'", name); 4397} 4398 4399/* Print version information to FILE. 4400 Each line begins with INDENT (for the case where FILE is the 4401 assembler output file). */ 4402 4403static void 4404print_version (file, indent) 4405 FILE *file; 4406 const char *indent; 4407{ 4408#ifndef __VERSION__ 4409#define __VERSION__ "[?]" 4410#endif 4411 fnotice (file, 4412#ifdef __GNUC__ 4413 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n" 4414#else 4415 "%s%s%s version %s (%s) compiled by CC.\n" 4416#endif 4417 , indent, *indent != 0 ? " " : "", 4418 lang_hooks.name, version_string, TARGET_NAME, 4419 indent, __VERSION__); 4420} 4421 4422/* Print an option value and return the adjusted position in the line. 4423 ??? We don't handle error returns from fprintf (disk full); presumably 4424 other code will catch a disk full though. */ 4425 4426static int 4427print_single_switch (file, pos, max, indent, sep, term, type, name) 4428 FILE *file; 4429 int pos, max; 4430 const char *indent, *sep, *term, *type, *name; 4431{ 4432 /* The ultrix fprintf returns 0 on success, so compute the result we want 4433 here since we need it for the following test. */ 4434 int len = strlen (sep) + strlen (type) + strlen (name); 4435 4436 if (pos != 0 4437 && pos + len > max) 4438 { 4439 fprintf (file, "%s", term); 4440 pos = 0; 4441 } 4442 if (pos == 0) 4443 { 4444 fprintf (file, "%s", indent); 4445 pos = strlen (indent); 4446 } 4447 fprintf (file, "%s%s%s", sep, type, name); 4448 pos += len; 4449 return pos; 4450} 4451 4452/* Print active target switches to FILE. 4453 POS is the current cursor position and MAX is the size of a "line". 4454 Each line begins with INDENT and ends with TERM. 4455 Each switch is separated from the next by SEP. */ 4456 4457static void 4458print_switch_values (file, pos, max, indent, sep, term) 4459 FILE *file; 4460 int pos, max; 4461 const char *indent, *sep, *term; 4462{ 4463 size_t j; 4464 char **p; 4465 4466 /* Print the options as passed. */ 4467 4468 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term, 4469 _("options passed: "), ""); 4470 4471 for (p = &save_argv[1]; *p != NULL; p++) 4472 if (**p == '-') 4473 { 4474 /* Ignore these. */ 4475 if (strcmp (*p, "-o") == 0) 4476 { 4477 if (p[1] != NULL) 4478 p++; 4479 continue; 4480 } 4481 if (strcmp (*p, "-quiet") == 0) 4482 continue; 4483 if (strcmp (*p, "-version") == 0) 4484 continue; 4485 if ((*p)[1] == 'd') 4486 continue; 4487 4488 pos = print_single_switch (file, pos, max, indent, sep, term, *p, ""); 4489 } 4490 if (pos > 0) 4491 fprintf (file, "%s", term); 4492 4493 /* Print the -f and -m options that have been enabled. 4494 We don't handle language specific options but printing argv 4495 should suffice. */ 4496 4497 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term, 4498 _("options enabled: "), ""); 4499 4500 for (j = 0; j < ARRAY_SIZE (f_options); j++) 4501 if (*f_options[j].variable == f_options[j].on_value) 4502 pos = print_single_switch (file, pos, max, indent, sep, term, 4503 "-f", f_options[j].string); 4504 4505 /* Print target specific options. */ 4506 4507 for (j = 0; j < ARRAY_SIZE (target_switches); j++) 4508 if (target_switches[j].name[0] != '\0' 4509 && target_switches[j].value > 0 4510 && ((target_switches[j].value & target_flags) 4511 == target_switches[j].value)) 4512 { 4513 pos = print_single_switch (file, pos, max, indent, sep, term, 4514 "-m", target_switches[j].name); 4515 } 4516 4517#ifdef TARGET_OPTIONS 4518 for (j = 0; j < ARRAY_SIZE (target_options); j++) 4519 if (*target_options[j].variable != NULL) 4520 { 4521 char prefix[256]; 4522 sprintf (prefix, "-m%s", target_options[j].prefix); 4523 pos = print_single_switch (file, pos, max, indent, sep, term, 4524 prefix, *target_options[j].variable); 4525 } 4526#endif 4527 4528 fprintf (file, "%s", term); 4529} 4530 4531/* Open assembly code output file. Do this even if -fsyntax-only is 4532 on, because then the driver will have provided the name of a 4533 temporary file or bit bucket for us. NAME is the file specified on 4534 the command line, possibly NULL. */ 4535static void 4536init_asm_output (name) 4537 const char *name; 4538{ 4539 if (name == NULL && asm_file_name == 0) 4540 asm_out_file = stdout; 4541 else 4542 { 4543 if (asm_file_name == 0) 4544 { 4545 int len = strlen (dump_base_name); 4546 char *dumpname = (char *) xmalloc (len + 6); 4547 memcpy (dumpname, dump_base_name, len + 1); 4548 strip_off_ending (dumpname, len); 4549 strcat (dumpname, ".s"); 4550 asm_file_name = dumpname; 4551 } 4552 if (!strcmp (asm_file_name, "-")) 4553 asm_out_file = stdout; 4554 else 4555 asm_out_file = fopen (asm_file_name, "w"); 4556 if (asm_out_file == 0) 4557 fatal_io_error ("can't open %s for writing", asm_file_name); 4558 } 4559 4560#ifdef IO_BUFFER_SIZE 4561 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE), 4562 _IOFBF, IO_BUFFER_SIZE); 4563#endif 4564 4565 if (!flag_syntax_only) 4566 { 4567#ifdef ASM_FILE_START 4568 ASM_FILE_START (asm_out_file); 4569#endif 4570 4571#ifdef ASM_COMMENT_START 4572 if (flag_verbose_asm) 4573 { 4574 /* Print the list of options in effect. */ 4575 print_version (asm_out_file, ASM_COMMENT_START); 4576 print_switch_values (asm_out_file, 0, MAX_LINE, 4577 ASM_COMMENT_START, " ", "\n"); 4578 /* Add a blank line here so it appears in assembler output but not 4579 screen output. */ 4580 fprintf (asm_out_file, "\n"); 4581 } 4582#endif 4583 } 4584} 4585 4586/* Initialization of the front end environment, before command line 4587 options are parsed. Signal handlers, internationalization etc. 4588 ARGV0 is main's argv[0]. */ 4589static void 4590general_init (argv0) 4591 char *argv0; 4592{ 4593 char *p; 4594 4595 p = argv0 + strlen (argv0); 4596 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1])) 4597 --p; 4598 progname = p; 4599 4600 xmalloc_set_program_name (progname); 4601 4602 gcc_init_libintl (); 4603 4604 /* Install handler for SIGFPE, which may be received while we do 4605 compile-time floating point arithmetic. */ 4606 signal (SIGFPE, float_signal); 4607 4608 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */ 4609#ifdef SIGSEGV 4610 signal (SIGSEGV, crash_signal); 4611#endif 4612#ifdef SIGILL 4613 signal (SIGILL, crash_signal); 4614#endif 4615#ifdef SIGBUS 4616 signal (SIGBUS, crash_signal); 4617#endif 4618#ifdef SIGABRT 4619 signal (SIGABRT, crash_signal); 4620#endif 4621#if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT) 4622 signal (SIGIOT, crash_signal); 4623#endif 4624 4625 /* Initialize the diagnostics reporting machinery, so option parsing 4626 can give warnings and errors. */ 4627 diagnostic_initialize (global_dc); 4628} 4629 4630/* Parse command line options and set default flag values, called 4631 after language-independent option-independent initialization. Do 4632 minimal options processing. Outputting diagnostics is OK, but GC 4633 and identifier hashtables etc. are not initialized yet. */ 4634static void 4635parse_options_and_default_flags (argc, argv) 4636 int argc; 4637 char **argv; 4638{ 4639 int i; 4640 4641 /* Save in case md file wants to emit args as a comment. */ 4642 save_argc = argc; 4643 save_argv = argv; 4644 4645 /* Initialize register usage now so switches may override. */ 4646 init_reg_sets (); 4647 4648 /* Register the language-independent parameters. */ 4649 add_params (lang_independent_params, LAST_PARAM); 4650 4651 /* Perform language-specific options initialization. */ 4652 (*lang_hooks.init_options) (); 4653 4654 /* Scan to see what optimization level has been specified. That will 4655 determine the default value of many flags. */ 4656 for (i = 1; i < argc; i++) 4657 { 4658 if (!strcmp (argv[i], "-O")) 4659 { 4660 optimize = 1; 4661 optimize_size = 0; 4662 } 4663 else if (argv[i][0] == '-' && argv[i][1] == 'O') 4664 { 4665 /* Handle -Os, -O2, -O3, -O69, ... */ 4666 char *p = &argv[i][2]; 4667 4668 if ((p[0] == 's') && (p[1] == 0)) 4669 { 4670 optimize_size = 1; 4671 4672 /* Optimizing for size forces optimize to be 2. */ 4673 optimize = 2; 4674 } 4675 else 4676 { 4677 const int optimize_val = read_integral_parameter (p, p - 2, -1); 4678 if (optimize_val != -1) 4679 { 4680 optimize = optimize_val; 4681 4682#ifdef FORCE_OPTIMIZATION_DOWNGRADE 4683#warning FORCE_OPTIMIZATION_DOWNGRADE 4684 if (optimize > FORCE_OPTIMIZATION_DOWNGRADE) 4685 { 4686 optimize = FORCE_OPTIMIZATION_DOWNGRADE; 4687 warning ("\n***\n***\t-O%d converted to \"-O%d\" due to optimizer bugs on this platform\n***", 4688 optimize_val, 4689 FORCE_OPTIMIZATION_DOWNGRADE); 4690 4691 } 4692#endif /*FORCE_OPTIMIZATION_DOWNGRADE*/ 4693 4694#if defined(TRY_WITHOUT_THIS__alpha__) 4695 if (optimize > 1) 4696 { 4697 warning ("\n***\n***\tThe -O%d flag TRIGGERS KNOWN OPTIMIZER BUGS ON THIS PLATFORM\n***", 4698 optimize_val); 4699 } 4700#endif /*__alpha__*/ 4701 4702 optimize_size = 0; 4703 } 4704 } 4705 } 4706 } 4707 4708 if (!optimize) 4709 { 4710 flag_merge_constants = 0; 4711 } 4712 4713 if (optimize >= 1) 4714 { 4715 flag_defer_pop = 1; 4716 flag_thread_jumps = 1; 4717#ifdef DELAY_SLOTS 4718 flag_delayed_branch = 1; 4719#endif 4720#ifdef CAN_DEBUG_WITHOUT_FP 4721 flag_omit_frame_pointer = 1; 4722#endif 4723 flag_guess_branch_prob = 1; 4724 flag_cprop_registers = 1; 4725 } 4726 4727 if (optimize >= 2) 4728 { 4729 flag_optimize_sibling_calls = 1; 4730 flag_cse_follow_jumps = 1; 4731 flag_cse_skip_blocks = 1; 4732 flag_gcse = 1; 4733 flag_expensive_optimizations = 1; 4734 flag_strength_reduce = 1; 4735 flag_rerun_cse_after_loop = 1; 4736 flag_rerun_loop_opt = 1; 4737 flag_caller_saves = 1; 4738 flag_force_mem = 1; 4739 flag_peephole2 = 1; 4740#ifdef INSN_SCHEDULING 4741 flag_schedule_insns = 1; 4742 flag_schedule_insns_after_reload = 1; 4743#endif 4744 flag_regmove = 1; 4745 flag_strict_aliasing = 1; 4746 flag_delete_null_pointer_checks = 1; 4747 flag_reorder_blocks = 1; 4748 } 4749 4750 if (optimize >= 3) 4751 { 4752 flag_inline_functions = 1; 4753 flag_rename_registers = 1; 4754 } 4755 4756 if (optimize_size) 4757 { 4758 align_loops = 1; 4759 align_jumps = 1; 4760 align_labels = 1; 4761 align_functions = 1; 4762 } 4763 4764 /* Initialize whether `char' is signed. */ 4765 flag_signed_char = DEFAULT_SIGNED_CHAR; 4766#ifdef DEFAULT_SHORT_ENUMS 4767 /* Initialize how much space enums occupy, by default. */ 4768 flag_short_enums = DEFAULT_SHORT_ENUMS; 4769#endif 4770 4771 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can 4772 modify it. */ 4773 target_flags = 0; 4774 set_target_switch (""); 4775 4776 /* Unwind tables are always present in an ABI-conformant IA-64 4777 object file, so the default should be ON. */ 4778#ifdef IA64_UNWIND_INFO 4779 flag_unwind_tables = IA64_UNWIND_INFO; 4780#endif 4781 4782#ifdef OPTIMIZATION_OPTIONS 4783 /* Allow default optimizations to be specified on a per-machine basis. */ 4784 OPTIMIZATION_OPTIONS (optimize, optimize_size); 4785#endif 4786 4787 /* Perform normal command line switch decoding. */ 4788 for (i = 1; i < argc;) 4789 { 4790 int lang_processed; 4791 int indep_processed; 4792 4793 /* Give the language a chance to decode the option for itself. */ 4794 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i); 4795 4796 if (lang_processed >= 0) 4797 /* Now see if the option also has a language independent meaning. 4798 Some options are both language specific and language independent, 4799 eg --help. */ 4800 indep_processed = independent_decode_option (argc - i, argv + i); 4801 else 4802 { 4803 lang_processed = -lang_processed; 4804 indep_processed = 0; 4805 } 4806 4807 if (lang_processed || indep_processed) 4808 i += MAX (lang_processed, indep_processed); 4809 else 4810 { 4811 const char *option = NULL; 4812 const char *lang = NULL; 4813 unsigned int j; 4814 4815 /* It is possible that the command line switch is not valid for the 4816 current language, but it is valid for another language. In order 4817 to be compatible with previous versions of the compiler (which 4818 did not issue an error message in this case) we check for this 4819 possibility here. If we do find a match, then if extra_warnings 4820 is set we generate a warning message, otherwise we will just 4821 ignore the option. */ 4822 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++) 4823 { 4824 option = documented_lang_options[j].option; 4825 4826 if (option == NULL) 4827 lang = documented_lang_options[j].description; 4828 else if (! strncmp (argv[i], option, strlen (option))) 4829 break; 4830 } 4831 4832 if (j != ARRAY_SIZE (documented_lang_options)) 4833 { 4834 if (extra_warnings) 4835 { 4836 warning ("ignoring command line option '%s'", argv[i]); 4837 if (lang) 4838 warning 4839 ("(it is valid for %s but not the selected language)", 4840 lang); 4841 } 4842 } 4843 else if (argv[i][0] == '-' && argv[i][1] == 'g') 4844 warning ("`%s': unknown or unsupported -g option", &argv[i][2]); 4845 else 4846 error ("unrecognized option `%s'", argv[i]); 4847 4848 i++; 4849 } 4850 } 4851 4852 if (flag_no_inline == 2) 4853 flag_no_inline = 0; 4854 else 4855 flag_really_no_inline = flag_no_inline; 4856 4857 /* Set flag_no_inline before the post_options () hook. The C front 4858 ends use it to determine tree inlining defaults. FIXME: such 4859 code should be lang-independent when all front ends use tree 4860 inlining, in which case it, and this condition, should be moved 4861 to the top of process_options() instead. */ 4862 if (optimize == 0) 4863 { 4864 /* Inlining does not work if not optimizing, 4865 so force it not to be done. */ 4866 flag_no_inline = 1; 4867 warn_inline = 0; 4868 4869 /* The c_decode_option function and decode_option hook set 4870 this to `2' if -Wall is used, so we can avoid giving out 4871 lots of errors for people who don't realize what -Wall does. */ 4872 if (warn_uninitialized == 1) 4873 warning ("-Wuninitialized is not supported without -O"); 4874 } 4875 4876 if (flag_really_no_inline == 2) 4877 flag_really_no_inline = flag_no_inline; 4878 4879 /* All command line options have been parsed; allow the front end to 4880 perform consistency checks, etc. */ 4881 (*lang_hooks.post_options) (); 4882} 4883 4884/* Process the options that have been parsed. */ 4885static void 4886process_options () 4887{ 4888#ifdef OVERRIDE_OPTIONS 4889 /* Some machines may reject certain combinations of options. */ 4890 OVERRIDE_OPTIONS; 4891#endif 4892 4893 /* Set up the align_*_log variables, defaulting them to 1 if they 4894 were still unset. */ 4895 if (align_loops <= 0) align_loops = 1; 4896 if (align_loops_max_skip > align_loops || !align_loops) 4897 align_loops_max_skip = align_loops - 1; 4898 align_loops_log = floor_log2 (align_loops * 2 - 1); 4899 if (align_jumps <= 0) align_jumps = 1; 4900 if (align_jumps_max_skip > align_jumps || !align_jumps) 4901 align_jumps_max_skip = align_jumps - 1; 4902 align_jumps_log = floor_log2 (align_jumps * 2 - 1); 4903 if (align_labels <= 0) align_labels = 1; 4904 align_labels_log = floor_log2 (align_labels * 2 - 1); 4905 if (align_labels_max_skip > align_labels || !align_labels) 4906 align_labels_max_skip = align_labels - 1; 4907 if (align_functions <= 0) align_functions = 1; 4908 align_functions_log = floor_log2 (align_functions * 2 - 1); 4909 4910 /* Unrolling all loops implies that standard loop unrolling must also 4911 be done. */ 4912 if (flag_unroll_all_loops) 4913 flag_unroll_loops = 1; 4914 /* Loop unrolling requires that strength_reduction be on also. Silently 4915 turn on strength reduction here if it isn't already on. Also, the loop 4916 unrolling code assumes that cse will be run after loop, so that must 4917 be turned on also. */ 4918 if (flag_unroll_loops) 4919 { 4920 flag_strength_reduce = 1; 4921 flag_rerun_cse_after_loop = 1; 4922 } 4923 4924 if (flag_non_call_exceptions) 4925 flag_asynchronous_unwind_tables = 1; 4926 if (flag_asynchronous_unwind_tables) 4927 flag_unwind_tables = 1; 4928 4929 /* Warn about options that are not supported on this machine. */ 4930#ifndef INSN_SCHEDULING 4931 if (flag_schedule_insns || flag_schedule_insns_after_reload) 4932 warning ("instruction scheduling not supported on this target machine"); 4933#endif 4934#ifndef DELAY_SLOTS 4935 if (flag_delayed_branch) 4936 warning ("this target machine does not have delayed branches"); 4937#endif 4938 4939 /* Some operating systems do not allow profiling without a frame 4940 pointer. */ 4941 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER 4942 && profile_flag 4943 && flag_omit_frame_pointer) 4944 { 4945 error ("profiling does not work without a frame pointer"); 4946 flag_omit_frame_pointer = 0; 4947 } 4948 4949 user_label_prefix = USER_LABEL_PREFIX; 4950 if (flag_leading_underscore != -1) 4951 { 4952 /* If the default prefix is more complicated than "" or "_", 4953 issue a warning and ignore this option. */ 4954 if (user_label_prefix[0] == 0 || 4955 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0)) 4956 { 4957 user_label_prefix = flag_leading_underscore ? "_" : ""; 4958 } 4959 else 4960 warning ("-f%sleading-underscore not supported on this target machine", 4961 flag_leading_underscore ? "" : "no-"); 4962 } 4963 4964 /* If we are in verbose mode, write out the version and maybe all the 4965 option flags in use. */ 4966 if (version_flag) 4967 { 4968 print_version (stderr, ""); 4969 if (! quiet_flag) 4970 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n"); 4971 } 4972 4973 if (! quiet_flag) 4974 time_report = 1; 4975 4976 if (flag_syntax_only) 4977 { 4978 write_symbols = NO_DEBUG; 4979 profile_flag = 0; 4980 } 4981 4982 /* Now we know write_symbols, set up the debug hooks based on it. 4983 By default we do nothing for debug output. */ 4984#if defined(DBX_DEBUGGING_INFO) 4985 if (write_symbols == DBX_DEBUG) 4986 debug_hooks = &dbx_debug_hooks; 4987#endif 4988#if defined(XCOFF_DEBUGGING_INFO) 4989 if (write_symbols == XCOFF_DEBUG) 4990 debug_hooks = &xcoff_debug_hooks; 4991#endif 4992#ifdef SDB_DEBUGGING_INFO 4993 if (write_symbols == SDB_DEBUG) 4994 debug_hooks = &sdb_debug_hooks; 4995#endif 4996#ifdef DWARF_DEBUGGING_INFO 4997 if (write_symbols == DWARF_DEBUG) 4998 debug_hooks = &dwarf_debug_hooks; 4999#endif 5000#ifdef DWARF2_DEBUGGING_INFO 5001 if (write_symbols == DWARF2_DEBUG) 5002 debug_hooks = &dwarf2_debug_hooks; 5003#endif 5004#ifdef VMS_DEBUGGING_INFO 5005 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG) 5006 debug_hooks = &vmsdbg_debug_hooks; 5007#endif 5008 5009 /* If auxiliary info generation is desired, open the output file. 5010 This goes in the same directory as the source file--unlike 5011 all the other output files. */ 5012 if (flag_gen_aux_info) 5013 { 5014 aux_info_file = fopen (aux_info_file_name, "w"); 5015 if (aux_info_file == 0) 5016 fatal_io_error ("can't open %s", aux_info_file_name); 5017 } 5018 5019 if (! targetm.have_named_sections) 5020 { 5021 if (flag_function_sections) 5022 { 5023 warning ("-ffunction-sections not supported for this target"); 5024 flag_function_sections = 0; 5025 } 5026 if (flag_data_sections) 5027 { 5028 warning ("-fdata-sections not supported for this target"); 5029 flag_data_sections = 0; 5030 } 5031 } 5032 5033 if (flag_function_sections && profile_flag) 5034 { 5035 warning ("-ffunction-sections disabled; it makes profiling impossible"); 5036 flag_function_sections = 0; 5037 } 5038 5039#ifndef HAVE_prefetch 5040 if (flag_prefetch_loop_arrays) 5041 { 5042 warning ("-fprefetch-loop-arrays not supported for this target"); 5043 flag_prefetch_loop_arrays = 0; 5044 } 5045#else 5046 if (flag_prefetch_loop_arrays && !HAVE_prefetch) 5047 { 5048 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)"); 5049 flag_prefetch_loop_arrays = 0; 5050 } 5051#endif 5052 5053 /* This combination of options isn't handled for i386 targets and doesn't 5054 make much sense anyway, so don't allow it. */ 5055 if (flag_prefetch_loop_arrays && optimize_size) 5056 { 5057 warning ("-fprefetch-loop-arrays is not supported with -Os"); 5058 flag_prefetch_loop_arrays = 0; 5059 } 5060 5061#ifndef OBJECT_FORMAT_ELF 5062 if (flag_function_sections && write_symbols != NO_DEBUG) 5063 warning ("-ffunction-sections may affect debugging on some targets"); 5064#endif 5065} 5066 5067/* Language-independent initialization, before language-dependent 5068 initialization. */ 5069static void 5070lang_independent_init () 5071{ 5072 decl_printable_name = decl_name; 5073 lang_expand_expr = (lang_expand_expr_t) do_abort; 5074 5075 /* Set the language-dependent identifier size. */ 5076 tree_code_length[(int) IDENTIFIER_NODE] 5077 = ((lang_hooks.identifier_size - sizeof (struct tree_common) 5078 + sizeof (tree) - 1) / sizeof (tree)); 5079 5080 /* Initialize the garbage-collector, and string pools. */ 5081 init_ggc (); 5082 ggc_add_rtx_root (&stack_limit_rtx, 1); 5083 ggc_add_tree_root (¤t_function_decl, 1); 5084 ggc_add_tree_root (¤t_function_func_begin_label, 1); 5085 5086 init_stringpool (); 5087 init_obstacks (); 5088 5089 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL 5090 || debug_info_level == DINFO_LEVEL_VERBOSE 5091#ifdef VMS_DEBUGGING_INFO 5092 /* Enable line number info for traceback */ 5093 || debug_info_level > DINFO_LEVEL_NONE 5094#endif 5095 || flag_test_coverage 5096 || warn_notreached); 5097 init_regs (); 5098 init_alias_once (); 5099 init_stmt (); 5100 init_loop (); 5101 init_reload (); 5102 init_function_once (); 5103 init_stor_layout_once (); 5104 init_varasm_once (); 5105 init_EXPR_INSN_LIST_cache (); 5106 5107 /* The following initialization functions need to generate rtl, so 5108 provide a dummy function context for them. */ 5109 init_dummy_function_start (); 5110 init_expmed (); 5111 init_expr_once (); 5112 if (flag_caller_saves) 5113 init_caller_save (); 5114 expand_dummy_function_end (); 5115} 5116 5117/* Language-dependent initialization. Returns non-zero on success. */ 5118static int 5119lang_dependent_init (name) 5120 const char *name; 5121{ 5122 if (dump_base_name == 0) 5123 dump_base_name = name ? name : "gccdump"; 5124 5125 /* Front-end initialization. This hook can assume that GC, 5126 identifier hashes etc. are set up, but debug initialization is 5127 not done yet. This routine must return the original filename 5128 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */ 5129 name = (*lang_hooks.init) (name); 5130 if (name == NULL) 5131 return 0; 5132 5133 /* Is this duplication necessary? */ 5134 name = ggc_strdup (name); 5135 main_input_filename = input_filename = name; 5136 init_asm_output (name); 5137 5138 /* These create various _DECL nodes, so need to be called after the 5139 front end is initialized. */ 5140 init_eh (); 5141 init_optabs (); 5142 5143 /* Put an entry on the input file stack for the main input file. */ 5144 push_srcloc (input_filename, 0); 5145 5146 /* If dbx symbol table desired, initialize writing it and output the 5147 predefined types. */ 5148 timevar_push (TV_SYMOUT); 5149 5150#ifdef DWARF2_UNWIND_INFO 5151 if (dwarf2out_do_frame ()) 5152 dwarf2out_frame_init (); 5153#endif 5154 5155 /* Now we have the correct original filename, we can initialize 5156 debug output. */ 5157 (*debug_hooks->init) (name); 5158 5159 timevar_pop (TV_SYMOUT); 5160 5161 return 1; 5162} 5163 5164/* Clean up: close opened files, etc. */ 5165 5166static void 5167finalize () 5168{ 5169 /* Close the dump files. */ 5170 if (flag_gen_aux_info) 5171 { 5172 fclose (aux_info_file); 5173 if (errorcount) 5174 unlink (aux_info_file_name); 5175 } 5176 5177 /* Close non-debugging input and output files. Take special care to note 5178 whether fclose returns an error, since the pages might still be on the 5179 buffer chain while the file is open. */ 5180 5181 if (asm_out_file) 5182 { 5183 if (ferror (asm_out_file) != 0) 5184 fatal_io_error ("error writing to %s", asm_file_name); 5185 if (fclose (asm_out_file) != 0) 5186 fatal_io_error ("error closing %s", asm_file_name); 5187 } 5188 5189 /* Do whatever is necessary to finish printing the graphs. */ 5190 if (graph_dump_format != no_graph) 5191 { 5192 int i; 5193 5194 for (i = 0; i < (int) DFI_MAX; ++i) 5195 if (dump_file[i].initialized && dump_file[i].graph_dump_p) 5196 { 5197 char seq[16]; 5198 char *suffix; 5199 5200 sprintf (seq, DUMPFILE_FORMAT, i); 5201 suffix = concat (seq, dump_file[i].extension, NULL); 5202 finish_graph_dump_file (dump_base_name, suffix); 5203 free (suffix); 5204 } 5205 } 5206 5207 if (mem_report) 5208 { 5209 ggc_print_statistics (); 5210 stringpool_statistics (); 5211 dump_tree_statistics (); 5212 } 5213 5214 /* Free up memory for the benefit of leak detectors. */ 5215 free_reg_info (); 5216 5217 /* Language-specific end of compilation actions. */ 5218 (*lang_hooks.finish) (); 5219} 5220 5221/* Initialize the compiler, and compile the input file. */ 5222static void 5223do_compile () 5224{ 5225 /* The bulk of command line switch processing. */ 5226 process_options (); 5227 5228 /* We cannot start timing until after options are processed since that 5229 says if we run timers or not. */ 5230 init_timevar (); 5231 timevar_start (TV_TOTAL); 5232 5233 /* Language-independent initialization. Also sets up GC, identifier 5234 hashes etc. */ 5235 lang_independent_init (); 5236 5237 /* Language-dependent initialization. Returns true on success. */ 5238 if (lang_dependent_init (filename)) 5239 compile_file (); 5240 5241 finalize (); 5242 5243 /* Stop timing and print the times. */ 5244 timevar_stop (TV_TOTAL); 5245 timevar_print (stderr); 5246} 5247 5248/* Entry point of cc1, cc1plus, jc1, f771, etc. 5249 Decode command args, then call compile_file. 5250 Exit code is FATAL_EXIT_CODE if can't open files or if there were 5251 any errors, or SUCCESS_EXIT_CODE if compilation succeeded. 5252 5253 It is not safe to call this function more than once. */ 5254 5255int 5256toplev_main (argc, argv) 5257 int argc; 5258 char **argv; 5259{ 5260 hex_init (); 5261 5262 /* Initialization of GCC's environment, and diagnostics. */ 5263 general_init (argv [0]); 5264 5265 /* Parse the options and do minimal processing; basically just 5266 enough to default flags appropriately. */ 5267 parse_options_and_default_flags (argc, argv); 5268 5269 /* Exit early if we can (e.g. -help). */ 5270 if (!errorcount && !exit_after_options) 5271 do_compile (); 5272 5273 if (errorcount || sorrycount) 5274 return (FATAL_EXIT_CODE); 5275 5276 return (SUCCESS_EXIT_CODE); 5277} 5278