toplev.c revision 104765
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 104765 2002-10-10 04:51:11Z kan $ */ 23 24/* This is the top level of cc1/c++. 25 It parses command args, opens files, invokes the various passes 26 in the proper order, and counts the time used by each. 27 Error messages and low-level interface to malloc also handled here. */ 28 29#include "config.h" 30#undef FLOAT /* This is for hpux. They should change hpux. */ 31#undef FFS /* Some systems define this in param.h. */ 32#include "system.h" 33#include <signal.h> 34#include <setjmp.h> 35 36#ifdef HAVE_SYS_RESOURCE_H 37# include <sys/resource.h> 38#endif 39 40#ifdef HAVE_SYS_TIMES_H 41# include <sys/times.h> 42#endif 43 44#include "input.h" 45#include "tree.h" 46#include "rtl.h" 47#include "tm_p.h" 48#include "flags.h" 49#include "insn-attr.h" 50#include "insn-config.h" 51#include "insn-flags.h" 52#include "hard-reg-set.h" 53#include "recog.h" 54#include "output.h" 55#include "except.h" 56#include "function.h" 57#include "toplev.h" 58#include "expr.h" 59#include "basic-block.h" 60#include "intl.h" 61#include "ggc.h" 62#include "graph.h" 63#include "loop.h" 64#include "regs.h" 65#include "timevar.h" 66#include "diagnostic.h" 67#include "ssa.h" 68#include "params.h" 69#include "reload.h" 70#include "dwarf2asm.h" 71#include "integrate.h" 72#include "debug.h" 73#include "target.h" 74#include "langhooks.h" 75 76#if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO) 77#include "dwarf2out.h" 78#endif 79 80#if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) 81#include "dbxout.h" 82#endif 83 84#ifdef SDB_DEBUGGING_INFO 85#include "sdbout.h" 86#endif 87 88#ifdef XCOFF_DEBUGGING_INFO 89#include "xcoffout.h" /* Needed for external data 90 declarations for e.g. AIX 4.x. */ 91#endif 92 93#ifdef HALF_PIC_DEBUG 94#include "halfpic.h" 95#endif 96 97/* Carry information from ASM_DECLARE_OBJECT_NAME 98 to ASM_FINISH_DECLARE_OBJECT. */ 99 100extern int size_directive_output; 101extern tree last_assemble_variable_decl; 102 103static void general_init PARAMS ((char *)); 104static void parse_options_and_default_flags PARAMS ((int, char **)); 105static void do_compile PARAMS ((void)); 106static void process_options PARAMS ((void)); 107static void lang_independent_init PARAMS ((void)); 108static int lang_dependent_init PARAMS ((const char *)); 109static void init_asm_output PARAMS ((const char *)); 110static void finalize PARAMS ((void)); 111 112static void set_target_switch PARAMS ((const char *)); 113static const char *decl_name PARAMS ((tree, int)); 114 115static void float_signal PARAMS ((int)) ATTRIBUTE_NORETURN; 116static void crash_signal PARAMS ((int)) ATTRIBUTE_NORETURN; 117static void set_float_handler PARAMS ((jmp_buf)); 118static void compile_file PARAMS ((void)); 119static void display_help PARAMS ((void)); 120static void display_target_options PARAMS ((void)); 121 122static void decode_d_option PARAMS ((const char *)); 123static int decode_f_option PARAMS ((const char *)); 124static int decode_W_option PARAMS ((const char *)); 125static int decode_g_option PARAMS ((const char *)); 126static unsigned int independent_decode_option PARAMS ((int, char **)); 127 128static void print_version PARAMS ((FILE *, const char *)); 129static int print_single_switch PARAMS ((FILE *, int, int, const char *, 130 const char *, const char *, 131 const char *, const char *)); 132static void print_switch_values PARAMS ((FILE *, int, int, const char *, 133 const char *, const char *)); 134 135/* Length of line when printing switch values. */ 136#define MAX_LINE 75 137 138/* Name of program invoked, sans directories. */ 139 140const char *progname; 141 142/* Copy of arguments to toplev_main. */ 143int save_argc; 144char **save_argv; 145 146/* Name of current original source file (what was input to cpp). 147 This comes from each #-command in the actual input. */ 148 149const char *input_filename; 150 151/* Name of top-level original source file (what was input to cpp). 152 This comes from the #-command at the beginning of the actual input. 153 If there isn't any there, then this is the cc1 input file name. */ 154 155const char *main_input_filename; 156 157/* Current line number in real source file. */ 158 159int lineno; 160 161/* Nonzero if it is unsafe to create any new pseudo registers. */ 162int no_new_pseudos; 163 164/* Stack of currently pending input files. */ 165 166struct file_stack *input_file_stack; 167 168/* Incremented on each change to input_file_stack. */ 169int input_file_stack_tick; 170 171/* Name to use as base of names for dump output files. */ 172 173const char *dump_base_name; 174 175/* Format to use to print dumpfile index value */ 176#ifndef DUMPFILE_FORMAT 177#define DUMPFILE_FORMAT ".%02d." 178#endif 179 180/* Bit flags that specify the machine subtype we are compiling for. 181 Bits are tested using macros TARGET_... defined in the tm.h file 182 and set by `-m...' switches. Must be defined in rtlanal.c. */ 183 184extern int target_flags; 185 186/* Debug hooks - dependent upon command line options. */ 187 188struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks; 189 190/* Describes a dump file. */ 191 192struct dump_file_info 193{ 194 /* The unique extension to apply, e.g. ".jump". */ 195 const char *const extension; 196 197 /* The -d<c> character that enables this dump file. */ 198 char const debug_switch; 199 200 /* True if there is a corresponding graph dump file. */ 201 char const graph_dump_p; 202 203 /* True if the user selected this dump. */ 204 char enabled; 205 206 /* True if the files have been initialized (ie truncated). */ 207 char initialized; 208}; 209 210/* Enumerate the extant dump files. */ 211 212enum dump_file_index 213{ 214 DFI_rtl, 215 DFI_sibling, 216 DFI_eh, 217 DFI_jump, 218 DFI_ssa, 219 DFI_ssa_ccp, 220 DFI_ssa_dce, 221 DFI_ussa, 222 DFI_cse, 223 DFI_addressof, 224 DFI_gcse, 225 DFI_loop, 226 DFI_cse2, 227 DFI_cfg, 228 DFI_bp, 229 DFI_life, 230 DFI_combine, 231 DFI_ce, 232 DFI_regmove, 233 DFI_sched, 234 DFI_lreg, 235 DFI_greg, 236 DFI_postreload, 237 DFI_flow2, 238 DFI_peephole2, 239 DFI_rnreg, 240 DFI_ce2, 241 DFI_sched2, 242 DFI_stack, 243 DFI_bbro, 244 DFI_mach, 245 DFI_dbr, 246 DFI_MAX 247}; 248 249/* Describes all the dump files. Should be kept in order of the 250 pass and in sync with dump_file_index above. 251 252 Remaining -d letters: 253 254 " o q u " 255 " H JK OPQ TUV YZ" 256*/ 257 258static struct dump_file_info dump_file[DFI_MAX] = 259{ 260 { "rtl", 'r', 0, 0, 0 }, 261 { "sibling", 'i', 0, 0, 0 }, 262 { "eh", 'h', 0, 0, 0 }, 263 { "jump", 'j', 0, 0, 0 }, 264 { "ssa", 'e', 1, 0, 0 }, 265 { "ssaccp", 'W', 1, 0, 0 }, 266 { "ssadce", 'X', 1, 0, 0 }, 267 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */ 268 { "cse", 's', 0, 0, 0 }, 269 { "addressof", 'F', 0, 0, 0 }, 270 { "gcse", 'G', 1, 0, 0 }, 271 { "loop", 'L', 1, 0, 0 }, 272 { "cse2", 't', 1, 0, 0 }, 273 { "cfg", 'f', 1, 0, 0 }, 274 { "bp", 'b', 1, 0, 0 }, 275 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */ 276 { "combine", 'c', 1, 0, 0 }, 277 { "ce", 'C', 1, 0, 0 }, 278 { "regmove", 'N', 1, 0, 0 }, 279 { "sched", 'S', 1, 0, 0 }, 280 { "lreg", 'l', 1, 0, 0 }, 281 { "greg", 'g', 1, 0, 0 }, 282 { "postreload", 'o', 1, 0, 0 }, 283 { "flow2", 'w', 1, 0, 0 }, 284 { "peephole2", 'z', 1, 0, 0 }, 285 { "rnreg", 'n', 1, 0, 0 }, 286 { "ce2", 'E', 1, 0, 0 }, 287 { "sched2", 'R', 1, 0, 0 }, 288 { "stack", 'k', 1, 0, 0 }, 289 { "bbro", 'B', 1, 0, 0 }, 290 { "mach", 'M', 1, 0, 0 }, 291 { "dbr", 'd', 0, 0, 0 }, 292}; 293 294static int open_dump_file PARAMS ((enum dump_file_index, tree)); 295static void close_dump_file PARAMS ((enum dump_file_index, 296 void (*) (FILE *, rtx), rtx)); 297 298/* Other flags saying which kinds of debugging dump have been requested. */ 299 300int rtl_dump_and_exit; 301int flag_print_asm_name; 302static int version_flag; 303static char *filename; 304enum graph_dump_types graph_dump_format; 305 306/* Name for output file of assembly code, specified with -o. */ 307 308char *asm_file_name; 309 310/* Value of the -G xx switch, and whether it was passed or not. */ 311int g_switch_value; 312int g_switch_set; 313 314/* Type(s) of debugging information we are producing (if any). 315 See flags.h for the definitions of the different possible 316 types of debugging information. */ 317enum debug_info_type write_symbols = NO_DEBUG; 318 319/* Level of debugging information we are producing. See flags.h 320 for the definitions of the different possible levels. */ 321enum debug_info_level debug_info_level = DINFO_LEVEL_NONE; 322 323/* Nonzero means use GNU-only extensions in the generated symbolic 324 debugging information. */ 325/* Currently, this only has an effect when write_symbols is set to 326 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */ 327int use_gnu_debug_info_extensions = 0; 328 329/* Nonzero means do optimizations. -O. 330 Particular numeric values stand for particular amounts of optimization; 331 thus, -O2 stores 2 here. However, the optimizations beyond the basic 332 ones are not controlled directly by this variable. Instead, they are 333 controlled by individual `flag_...' variables that are defaulted 334 based on this variable. */ 335 336int optimize = 0; 337 338/* Nonzero means optimize for size. -Os. 339 The only valid values are zero and non-zero. When optimize_size is 340 non-zero, optimize defaults to 2, but certain individual code 341 bloating optimizations are disabled. */ 342 343int optimize_size = 0; 344 345/* Nonzero if we should exit after parsing options. */ 346static int exit_after_options = 0; 347 348/* The FUNCTION_DECL for the function currently being compiled, 349 or 0 if between functions. */ 350tree current_function_decl; 351 352/* Set to the FUNC_BEGIN label of the current function, or NULL_TREE 353 if none. */ 354tree current_function_func_begin_label; 355 356/* Pointer to function to compute the name to use to print a declaration. 357 DECL is the declaration in question. 358 VERBOSITY determines what information will be printed: 359 0: DECL_NAME, demangled as necessary. 360 1: and scope information. 361 2: and any other information that might be interesting, such as function 362 parameter types in C++. */ 363 364const char *(*decl_printable_name) PARAMS ((tree, int)); 365 366/* Pointer to function to compute rtl for a language-specific tree code. */ 367 368typedef rtx (*lang_expand_expr_t) 369 PARAMS ((union tree_node *, rtx, enum machine_mode, 370 enum expand_modifier modifier)); 371 372lang_expand_expr_t lang_expand_expr = 0; 373 374/* Pointer to function to finish handling an incomplete decl at the 375 end of compilation. */ 376 377void (*incomplete_decl_finalize_hook) PARAMS ((tree)) = 0; 378 379/* Nonzero if doing dwarf2 duplicate elimination. */ 380 381int flag_eliminate_dwarf2_dups = 0; 382 383/* Nonzero if generating code to do profiling. */ 384 385int profile_flag = 0; 386 387/* Nonzero if generating code to profile program flow graph arcs. */ 388 389int profile_arc_flag = 0; 390 391/* Nonzero if generating info for gcov to calculate line test coverage. */ 392 393int flag_test_coverage = 0; 394 395/* Nonzero indicates that branch taken probabilities should be calculated. */ 396 397int flag_branch_probabilities = 0; 398 399/* Nonzero if basic blocks should be reordered. */ 400 401int flag_reorder_blocks = 0; 402 403/* Nonzero if registers should be renamed. */ 404 405int flag_rename_registers = 0; 406int flag_cprop_registers = 0; 407 408/* Nonzero for -pedantic switch: warn about anything 409 that standard spec forbids. */ 410 411int pedantic = 0; 412 413/* Temporarily suppress certain warnings. 414 This is set while reading code from a system header file. */ 415 416int in_system_header = 0; 417 418/* Don't print functions as they are compiled. -quiet. */ 419 420int quiet_flag = 0; 421 422/* Print times taken by the various passes. -ftime-report. */ 423 424int time_report = 0; 425 426/* Print memory still in use at end of compilation (which may have little 427 to do with peak memory consumption). -fmem-report. */ 428 429int mem_report = 0; 430 431/* Non-zero means to collect statistics which might be expensive 432 and to print them when we are done. */ 433int flag_detailed_statistics = 0; 434 435 436/* -f flags. */ 437 438/* Nonzero means `char' should be signed. */ 439 440int flag_signed_char; 441 442/* Nonzero means give an enum type only as many bytes as it needs. */ 443 444int flag_short_enums; 445 446/* Nonzero for -fcaller-saves: allocate values in regs that need to 447 be saved across function calls, if that produces overall better code. 448 Optional now, so people can test it. */ 449 450#ifdef DEFAULT_CALLER_SAVES 451int flag_caller_saves = 1; 452#else 453int flag_caller_saves = 0; 454#endif 455 456/* Nonzero if structures and unions should be returned in memory. 457 458 This should only be defined if compatibility with another compiler or 459 with an ABI is needed, because it results in slower code. */ 460 461#ifndef DEFAULT_PCC_STRUCT_RETURN 462#define DEFAULT_PCC_STRUCT_RETURN 1 463#endif 464 465/* Nonzero for -fpcc-struct-return: return values the same way PCC does. */ 466 467int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN; 468 469/* Nonzero for -fforce-mem: load memory value into a register 470 before arithmetic on it. This makes better cse but slower compilation. */ 471 472int flag_force_mem = 0; 473 474/* Nonzero for -fforce-addr: load memory address into a register before 475 reference to memory. This makes better cse but slower compilation. */ 476 477int flag_force_addr = 0; 478 479/* Nonzero for -fdefer-pop: don't pop args after each function call; 480 instead save them up to pop many calls' args with one insns. */ 481 482int flag_defer_pop = 0; 483 484/* Nonzero for -ffloat-store: don't allocate floats and doubles 485 in extended-precision registers. */ 486 487int flag_float_store = 0; 488 489/* Nonzero for -fcse-follow-jumps: 490 have cse follow jumps to do a more extensive job. */ 491 492int flag_cse_follow_jumps; 493 494/* Nonzero for -fcse-skip-blocks: 495 have cse follow a branch around a block. */ 496int flag_cse_skip_blocks; 497 498/* Nonzero for -fexpensive-optimizations: 499 perform miscellaneous relatively-expensive optimizations. */ 500int flag_expensive_optimizations; 501 502/* Nonzero for -fthread-jumps: 503 have jump optimize output of loop. */ 504 505int flag_thread_jumps; 506 507/* Nonzero enables strength-reduction in loop.c. */ 508 509int flag_strength_reduce = 0; 510 511/* Nonzero enables loop unrolling in unroll.c. Only loops for which the 512 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY, 513 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are 514 unrolled. */ 515 516int flag_unroll_loops; 517 518/* Nonzero enables loop unrolling in unroll.c. All loops are unrolled. 519 This is generally not a win. */ 520 521int flag_unroll_all_loops; 522 523/* Nonzero enables prefetch optimizations for arrays in loops. */ 524 525int flag_prefetch_loop_arrays; 526 527/* Nonzero forces all invariant computations in loops to be moved 528 outside the loop. */ 529 530int flag_move_all_movables = 0; 531 532/* Nonzero forces all general induction variables in loops to be 533 strength reduced. */ 534 535int flag_reduce_all_givs = 0; 536 537/* Nonzero to perform full register move optimization passes. This is the 538 default for -O2. */ 539 540int flag_regmove = 0; 541 542/* Nonzero for -fwritable-strings: 543 store string constants in data segment and don't uniquize them. */ 544 545int flag_writable_strings = 0; 546 547/* Nonzero means don't put addresses of constant functions in registers. 548 Used for compiling the Unix kernel, where strange substitutions are 549 done on the assembly output. */ 550 551int flag_no_function_cse = 0; 552 553/* Nonzero for -fomit-frame-pointer: 554 don't make a frame pointer in simple functions that don't require one. */ 555 556int flag_omit_frame_pointer = 0; 557 558/* Nonzero means place each function into its own section on those platforms 559 which support arbitrary section names and unlimited numbers of sections. */ 560 561int flag_function_sections = 0; 562 563/* ... and similar for data. */ 564 565int flag_data_sections = 0; 566 567/* Nonzero to inhibit use of define_optimization peephole opts. */ 568 569int flag_no_peephole = 0; 570 571/* Nonzero allows GCC to optimize sibling and tail recursive calls. */ 572 573int flag_optimize_sibling_calls = 0; 574 575/* Nonzero means the front end generally wants `errno' maintained by math 576 operations, like built-in SQRT. */ 577 578int flag_errno_math = 1; 579 580/* Nonzero means that unsafe floating-point math optimizations are allowed 581 for the sake of speed. IEEE compliance is not guaranteed, and operations 582 are allowed to assume that their arguments and results are "normal" 583 (e.g., nonnegative for SQRT). */ 584 585int flag_unsafe_math_optimizations = 0; 586 587/* Zero means that floating-point math operations cannot generate a 588 (user-visible) trap. This is the case, for example, in nonstop 589 IEEE 754 arithmetic. */ 590 591int flag_trapping_math = 1; 592 593/* 0 means straightforward implementation of complex divide acceptable. 594 1 means wide ranges of inputs must work for complex divide. 595 2 means C99-like requirements for complex divide (not yet implemented). */ 596 597int flag_complex_divide_method = 0; 598 599/* Nonzero means all references through pointers are volatile. */ 600 601int flag_volatile; 602 603/* Nonzero means treat all global and extern variables as volatile. */ 604 605int flag_volatile_global; 606 607/* Nonzero means treat all static variables as volatile. */ 608 609int flag_volatile_static; 610 611/* Nonzero means just do syntax checking; don't output anything. */ 612 613int flag_syntax_only = 0; 614 615/* Nonzero means perform global cse. */ 616 617static int flag_gcse; 618 619/* Nonzero means to use global dataflow analysis to eliminate 620 useless null pointer tests. */ 621 622static int flag_delete_null_pointer_checks; 623 624/* Nonzero means to do the enhanced load motion during gcse, which trys 625 to hoist loads by not killing them when a store to the same location 626 is seen. */ 627 628int flag_gcse_lm = 1; 629 630/* Nonzero means to perform store motion after gcse, which will try to 631 move stores closer to the exit block. Its not very effective without 632 flag_gcse_lm. */ 633 634int flag_gcse_sm = 1; 635 636/* Nonzero means to rerun cse after loop optimization. This increases 637 compilation time about 20% and picks up a few more common expressions. */ 638 639static int flag_rerun_cse_after_loop; 640 641/* Nonzero means to run loop optimizations twice. */ 642 643int flag_rerun_loop_opt; 644 645/* Nonzero for -finline-functions: ok to inline functions that look like 646 good inline candidates. */ 647 648int flag_inline_functions; 649 650/* Nonzero for -fkeep-inline-functions: even if we make a function 651 go inline everywhere, keep its definition around for debugging 652 purposes. */ 653 654int flag_keep_inline_functions; 655 656/* Nonzero means that functions will not be inlined. */ 657 658int flag_no_inline = 2; 659 660/* Nonzero means that we don't want inlining by virtue of -fno-inline, 661 not just because the tree inliner turned us off. */ 662 663int flag_really_no_inline = 2; 664 665/* Nonzero means that we should emit static const variables 666 regardless of whether or not optimization is turned on. */ 667 668int flag_keep_static_consts = 1; 669 670/* Nonzero means we should be saving declaration info into a .X file. */ 671 672int flag_gen_aux_info = 0; 673 674/* Specified name of aux-info file. */ 675 676static char *aux_info_file_name; 677 678/* Nonzero means make the text shared if supported. */ 679 680int flag_shared_data; 681 682/* Nonzero means schedule into delayed branch slots if supported. */ 683 684int flag_delayed_branch; 685 686/* Nonzero if we are compiling pure (sharable) code. 687 Value is 1 if we are doing reasonable (i.e. simple 688 offset into offset table) pic. Value is 2 if we can 689 only perform register offsets. */ 690 691int flag_pic; 692 693/* Nonzero means generate extra code for exception handling and enable 694 exception handling. */ 695 696int flag_exceptions; 697 698/* Nonzero means generate frame unwind info table when supported. */ 699 700int flag_unwind_tables = 0; 701 702/* Nonzero means generate frame unwind info table exact at each insn boundary */ 703 704int flag_asynchronous_unwind_tables = 0; 705 706/* Nonzero means don't place uninitialized global data in common storage 707 by default. */ 708 709int flag_no_common; 710 711/* Nonzero means pretend it is OK to examine bits of target floats, 712 even if that isn't true. The resulting code will have incorrect constants, 713 but the same series of instructions that the native compiler would make. */ 714 715int flag_pretend_float; 716 717/* Nonzero means change certain warnings into errors. 718 Usually these are warnings about failure to conform to some standard. */ 719 720int flag_pedantic_errors = 0; 721 722/* flag_schedule_insns means schedule insns within basic blocks (before 723 local_alloc). 724 flag_schedule_insns_after_reload means schedule insns after 725 global_alloc. */ 726 727int flag_schedule_insns = 0; 728int flag_schedule_insns_after_reload = 0; 729 730/* The following flags have effect only for scheduling before register 731 allocation: 732 733 flag_schedule_interblock means schedule insns accross basic blocks. 734 flag_schedule_speculative means allow speculative motion of non-load insns. 735 flag_schedule_speculative_load means allow speculative motion of some 736 load insns. 737 flag_schedule_speculative_load_dangerous allows speculative motion of more 738 load insns. */ 739 740int flag_schedule_interblock = 1; 741int flag_schedule_speculative = 1; 742int flag_schedule_speculative_load = 0; 743int flag_schedule_speculative_load_dangerous = 0; 744 745int flag_single_precision_constant; 746 747/* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple 748 by a cheaper branch on a count register. */ 749int flag_branch_on_count_reg = 1; 750 751/* -finhibit-size-directive inhibits output of .size for ELF. 752 This is used only for compiling crtstuff.c, 753 and it may be extended to other effects 754 needed for crtstuff.c on other systems. */ 755int flag_inhibit_size_directive = 0; 756 757/* -fverbose-asm causes extra commentary information to be produced in 758 the generated assembly code (to make it more readable). This option 759 is generally only of use to those who actually need to read the 760 generated assembly code (perhaps while debugging the compiler itself). 761 -fno-verbose-asm, the default, causes the extra information 762 to be omitted and is useful when comparing two assembler files. */ 763 764int flag_verbose_asm = 0; 765 766/* -dA causes debug commentary information to be produced in 767 the generated assembly code (to make it more readable). This option 768 is generally only of use to those who actually need to read the 769 generated assembly code (perhaps while debugging the compiler itself). 770 Currently, this switch is only used by dwarfout.c; however, it is intended 771 to be a catchall for printing debug information in the assembler file. */ 772 773int flag_debug_asm = 0; 774 775/* -dP causes the rtl to be emitted as a comment in assembly. */ 776 777int flag_dump_rtl_in_asm = 0; 778 779/* -fgnu-linker specifies use of the GNU linker for initializations. 780 (Or, more generally, a linker that handles initializations.) 781 -fno-gnu-linker says that collect2 will be used. */ 782#ifdef USE_COLLECT2 783int flag_gnu_linker = 0; 784#else 785int flag_gnu_linker = 1; 786#endif 787 788/* Enable SSA. */ 789int flag_ssa = 0; 790 791/* Enable ssa conditional constant propagation. */ 792int flag_ssa_ccp = 0; 793 794/* Enable ssa aggressive dead code elimination. */ 795int flag_ssa_dce = 0; 796 797/* Tag all structures with __attribute__(packed). */ 798int flag_pack_struct = 0; 799 800/* Nonzero means that -Wformat accepts certain system-dependent formats. */ 801int flag_format_extensions = 0; 802 803/* Emit code to check for stack overflow; also may cause large objects 804 to be allocated dynamically. */ 805int flag_stack_check; 806 807/* When non-NULL, indicates that whenever space is allocated on the 808 stack, the resulting stack pointer must not pass this 809 address---that is, for stacks that grow downward, the stack pointer 810 must always be greater than or equal to this address; for stacks 811 that grow upward, the stack pointer must be less than this address. 812 At present, the rtx may be either a REG or a SYMBOL_REF, although 813 the support provided depends on the backend. */ 814rtx stack_limit_rtx; 815 816/* 0 if pointer arguments may alias each other. True in C. 817 1 if pointer arguments may not alias each other but may alias 818 global variables. 819 2 if pointer arguments may not alias each other and may not 820 alias global variables. True in Fortran. 821 This defaults to 0 for C. */ 822int flag_argument_noalias = 0; 823 824/* Nonzero if we should do (language-dependent) alias analysis. 825 Typically, this analysis will assume that expressions of certain 826 types do not alias expressions of certain other types. Only used 827 if alias analysis (in general) is enabled. */ 828int flag_strict_aliasing = 0; 829 830/* Instrument functions with calls at entry and exit, for profiling. */ 831int flag_instrument_function_entry_exit = 0; 832 833/* Nonzero means ignore `#ident' directives. 0 means handle them. 834 On SVR4 targets, it also controls whether or not to emit a 835 string identifying the compiler. */ 836 837int flag_no_ident = 0; 838 839/* This will perform a peephole pass before sched2. */ 840int flag_peephole2 = 0; 841 842/* This will try to guess branch probabilities. */ 843int flag_guess_branch_prob = 0; 844 845/* -fbounded-pointers causes gcc to compile pointers as composite 846 objects occupying three words: the pointer value, the base address 847 of the referent object, and the address immediately beyond the end 848 of the referent object. The base and extent allow us to perform 849 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */ 850int flag_bounded_pointers = 0; 851 852/* -fcheck-bounds causes gcc to generate array bounds checks. 853 For C, C++: defaults to value of flag_bounded_pointers. 854 For ObjC: defaults to off. 855 For Java: defaults to on. 856 For Fortran: defaults to off. 857 For CHILL: defaults to off. */ 858int flag_bounds_check = 0; 859 860/* This will attempt to merge constant section constants, if 1 only 861 string constants and constants from constant pool, if 2 also constant 862 variables. */ 863int flag_merge_constants = 1; 864 865/* If one, renumber instruction UIDs to reduce the number of 866 unused UIDs if there are a lot of instructions. If greater than 867 one, unconditionally renumber instruction UIDs. */ 868int flag_renumber_insns = 1; 869 870/* Values of the -falign-* flags: how much to align labels in code. 871 0 means `use default', 1 means `don't align'. 872 For each variable, there is an _log variant which is the power 873 of two not less than the variable, for .align output. */ 874 875int align_loops; 876int align_loops_log; 877int align_loops_max_skip; 878int align_jumps; 879int align_jumps_log; 880int align_jumps_max_skip; 881int align_labels; 882int align_labels_log; 883int align_labels_max_skip; 884int align_functions; 885int align_functions_log; 886 887/* Like align_functions_log above, but used by front-ends to force the 888 minimum function alignment. Zero means no alignment is forced. */ 889int force_align_functions_log; 890 891/* Table of supported debugging formats. */ 892static const struct 893{ 894 const char *const arg; 895 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a 896 constant expression, we use NO_DEBUG in its place. */ 897 const enum debug_info_type debug_type; 898 const int use_extensions_p; 899 const char *const description; 900} *da, 901debug_args[] = 902{ 903 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS, 904 N_("Generate debugging info in default format") }, 905 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") }, 906#ifdef DBX_DEBUGGING_INFO 907 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") }, 908 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") }, 909#endif 910#ifdef DWARF_DEBUGGING_INFO 911 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") }, 912 { "dwarf+", DWARF_DEBUG, 1, 913 N_("Generate extended DWARF-1 format debug info") }, 914#endif 915#ifdef DWARF2_DEBUGGING_INFO 916 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") }, 917#endif 918#ifdef XCOFF_DEBUGGING_INFO 919 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") }, 920 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") }, 921#endif 922#ifdef SDB_DEBUGGING_INFO 923 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") }, 924#endif 925#ifdef VMS_DEBUGGING_INFO 926 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") }, 927#endif 928 { 0, 0, 0, 0 } 929}; 930 931typedef struct 932{ 933 const char *const string; 934 int *const variable; 935 const int on_value; 936 const char *const description; 937} 938lang_independent_options; 939 940int flag_trapv = 0; 941 942/* Add or remove a leading underscore from user symbols. */ 943int flag_leading_underscore = -1; 944 945/* The user symbol prefix after having resolved same. */ 946const char *user_label_prefix; 947 948static const param_info lang_independent_params[] = { 949#define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \ 950 { OPTION, DEFAULT, HELP }, 951#include "params.def" 952#undef DEFPARAM 953 { NULL, 0, NULL } 954}; 955 956/* A default for same. */ 957#ifndef USER_LABEL_PREFIX 958#define USER_LABEL_PREFIX "" 959#endif 960 961/* Table of language-independent -f options. 962 STRING is the option name. VARIABLE is the address of the variable. 963 ON_VALUE is the value to store in VARIABLE 964 if `-fSTRING' is seen as an option. 965 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */ 966 967static const lang_independent_options f_options[] = 968{ 969 {"format-extensions", &flag_format_extensions, 1, 970 N_("-Wformat accepts certain FreeBSD system-dependent formats") }, 971 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1, 972 N_("Perform DWARF2 duplicate elimination") }, 973 {"float-store", &flag_float_store, 1, 974 N_("Do not store floats in registers") }, 975 {"volatile", &flag_volatile, 1, 976 N_("Consider all mem refs through pointers as volatile") }, 977 {"volatile-global", &flag_volatile_global, 1, 978 N_("Consider all mem refs to global data to be volatile") }, 979 {"volatile-static", &flag_volatile_static, 1, 980 N_("Consider all mem refs to static data to be volatile") }, 981 {"defer-pop", &flag_defer_pop, 1, 982 N_("Defer popping functions args from stack until later") }, 983 {"omit-frame-pointer", &flag_omit_frame_pointer, 1, 984 N_("When possible do not generate stack frames") }, 985 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1, 986 N_("Optimize sibling and tail recursive calls") }, 987 {"cse-follow-jumps", &flag_cse_follow_jumps, 1, 988 N_("When running CSE, follow jumps to their targets") }, 989 {"cse-skip-blocks", &flag_cse_skip_blocks, 1, 990 N_("When running CSE, follow conditional jumps") }, 991 {"expensive-optimizations", &flag_expensive_optimizations, 1, 992 N_("Perform a number of minor, expensive optimizations") }, 993 {"thread-jumps", &flag_thread_jumps, 1, 994 N_("Perform jump threading optimizations") }, 995 {"strength-reduce", &flag_strength_reduce, 1, 996 N_("Perform strength reduction optimizations") }, 997 {"unroll-loops", &flag_unroll_loops, 1, 998 N_("Perform loop unrolling when iteration count is known") }, 999 {"unroll-all-loops", &flag_unroll_all_loops, 1, 1000 N_("Perform loop unrolling for all loops") }, 1001 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1, 1002 N_("Generate prefetch instructions, if available, for arrays in loops") }, 1003 {"move-all-movables", &flag_move_all_movables, 1, 1004 N_("Force all loop invariant computations out of loops") }, 1005 {"reduce-all-givs", &flag_reduce_all_givs, 1, 1006 N_("Strength reduce all loop general induction variables") }, 1007 {"writable-strings", &flag_writable_strings, 1, 1008 N_("Store strings in writable data section") }, 1009 {"peephole", &flag_no_peephole, 0, 1010 N_("Enable machine specific peephole optimizations") }, 1011 {"force-mem", &flag_force_mem, 1, 1012 N_("Copy memory operands into registers before using") }, 1013 {"force-addr", &flag_force_addr, 1, 1014 N_("Copy memory address constants into regs before using") }, 1015 {"function-cse", &flag_no_function_cse, 0, 1016 N_("Allow function addresses to be held in registers") }, 1017 {"inline-functions", &flag_inline_functions, 1, 1018 N_("Integrate simple functions into their callers") }, 1019 {"keep-inline-functions", &flag_keep_inline_functions, 1, 1020 N_("Generate code for funcs even if they are fully inlined") }, 1021 {"inline", &flag_no_inline, 0, 1022 N_("Pay attention to the 'inline' keyword") }, 1023 {"keep-static-consts", &flag_keep_static_consts, 1, 1024 N_("Emit static const variables even if they are not used") }, 1025 {"syntax-only", &flag_syntax_only, 1, 1026 N_("Check for syntax errors, then stop") }, 1027 {"shared-data", &flag_shared_data, 1, 1028 N_("Mark data as shared rather than private") }, 1029 {"caller-saves", &flag_caller_saves, 1, 1030 N_("Enable saving registers around function calls") }, 1031 {"pcc-struct-return", &flag_pcc_struct_return, 1, 1032 N_("Return 'short' aggregates in memory, not registers") }, 1033 {"reg-struct-return", &flag_pcc_struct_return, 0, 1034 N_("Return 'short' aggregates in registers") }, 1035 {"delayed-branch", &flag_delayed_branch, 1, 1036 N_("Attempt to fill delay slots of branch instructions") }, 1037 {"gcse", &flag_gcse, 1, 1038 N_("Perform the global common subexpression elimination") }, 1039 {"gcse-lm", &flag_gcse_lm, 1, 1040 N_("Perform enhanced load motion during global subexpression elimination") }, 1041 {"gcse-sm", &flag_gcse_sm, 1, 1042 N_("Perform store motion after global subexpression elimination") }, 1043 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1, 1044 N_("Run CSE pass after loop optimizations") }, 1045 {"rerun-loop-opt", &flag_rerun_loop_opt, 1, 1046 N_("Run the loop optimizer twice") }, 1047 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1, 1048 N_("Delete useless null pointer checks") }, 1049 {"pretend-float", &flag_pretend_float, 1, 1050 N_("Pretend that host and target use the same FP format") }, 1051 {"schedule-insns", &flag_schedule_insns, 1, 1052 N_("Reschedule instructions before register allocation") }, 1053 {"schedule-insns2", &flag_schedule_insns_after_reload, 1, 1054 N_("Reschedule instructions after register allocation") }, 1055 {"sched-interblock",&flag_schedule_interblock, 1, 1056 N_("Enable scheduling across basic blocks") }, 1057 {"sched-spec",&flag_schedule_speculative, 1, 1058 N_("Allow speculative motion of non-loads") }, 1059 {"sched-spec-load",&flag_schedule_speculative_load, 1, 1060 N_("Allow speculative motion of some loads") }, 1061 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1, 1062 N_("Allow speculative motion of more loads") }, 1063 {"branch-count-reg",&flag_branch_on_count_reg, 1, 1064 N_("Replace add,compare,branch with branch on count reg") }, 1065 {"pic", &flag_pic, 1, 1066 N_("Generate position independent code, if possible") }, 1067 {"PIC", &flag_pic, 2, ""}, 1068 {"exceptions", &flag_exceptions, 1, 1069 N_("Enable exception handling") }, 1070 {"unwind-tables", &flag_unwind_tables, 1, 1071 N_("Just generate unwind tables for exception handling") }, 1072 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1, 1073 N_("Generate unwind tables exact at each instruction boundary") }, 1074 {"non-call-exceptions", &flag_non_call_exceptions, 1, 1075 N_("Support synchronous non-call exceptions") }, 1076 {"profile-arcs", &profile_arc_flag, 1, 1077 N_("Insert arc based program profiling code") }, 1078 {"test-coverage", &flag_test_coverage, 1, 1079 N_("Create data files needed by gcov") }, 1080 {"branch-probabilities", &flag_branch_probabilities, 1, 1081 N_("Use profiling information for branch probabilities") }, 1082 {"reorder-blocks", &flag_reorder_blocks, 1, 1083 N_("Reorder basic blocks to improve code placement") }, 1084 {"rename-registers", &flag_rename_registers, 1, 1085 N_("Do the register renaming optimization pass") }, 1086 {"cprop-registers", &flag_cprop_registers, 1, 1087 N_("Do the register copy-propagation optimization pass") }, 1088 {"common", &flag_no_common, 0, 1089 N_("Do not put uninitialized globals in the common section") }, 1090 {"inhibit-size-directive", &flag_inhibit_size_directive, 1, 1091 N_("Do not generate .size directives") }, 1092 {"function-sections", &flag_function_sections, 1, 1093 N_("place each function into its own section") }, 1094 {"data-sections", &flag_data_sections, 1, 1095 N_("place data items into their own section") }, 1096 {"verbose-asm", &flag_verbose_asm, 1, 1097 N_("Add extra commentry to assembler output") }, 1098 {"gnu-linker", &flag_gnu_linker, 1, 1099 N_("Output GNU ld formatted global initializers") }, 1100 {"regmove", &flag_regmove, 1, 1101 N_("Enables a register move optimization") }, 1102 {"optimize-register-move", &flag_regmove, 1, 1103 N_("Do the full regmove optimization pass") }, 1104 {"pack-struct", &flag_pack_struct, 1, 1105 N_("Pack structure members together without holes") }, 1106 {"stack-check", &flag_stack_check, 1, 1107 N_("Insert stack checking code into the program") }, 1108 {"argument-alias", &flag_argument_noalias, 0, 1109 N_("Specify that arguments may alias each other & globals") }, 1110 {"argument-noalias", &flag_argument_noalias, 1, 1111 N_("Assume arguments may alias globals but not each other") }, 1112 {"argument-noalias-global", &flag_argument_noalias, 2, 1113 N_("Assume arguments do not alias each other or globals") }, 1114 {"strict-aliasing", &flag_strict_aliasing, 1, 1115 N_("Assume strict aliasing rules apply") }, 1116 {"align-loops", &align_loops, 0, 1117 N_("Align the start of loops") }, 1118 {"align-jumps", &align_jumps, 0, 1119 N_("Align labels which are only reached by jumping") }, 1120 {"align-labels", &align_labels, 0, 1121 N_("Align all labels") }, 1122 {"align-functions", &align_functions, 0, 1123 N_("Align the start of functions") }, 1124 {"merge-constants", &flag_merge_constants, 1, 1125 N_("Attempt to merge identical constants accross compilation units") }, 1126 {"merge-all-constants", &flag_merge_constants, 2, 1127 N_("Attempt to merge identical constants and constant variables") }, 1128 {"dump-unnumbered", &flag_dump_unnumbered, 1, 1129 N_("Suppress output of instruction numbers and line number notes in debugging dumps") }, 1130 {"instrument-functions", &flag_instrument_function_entry_exit, 1, 1131 N_("Instrument function entry/exit with profiling calls") }, 1132 {"ssa", &flag_ssa, 1, 1133 N_("Enable SSA optimizations") }, 1134 {"ssa-ccp", &flag_ssa_ccp, 1, 1135 N_("Enable SSA conditional constant propagation") }, 1136 {"ssa-dce", &flag_ssa_dce, 1, 1137 N_("Enable aggressive SSA dead code elimination") }, 1138 {"leading-underscore", &flag_leading_underscore, 1, 1139 N_("External symbols have a leading underscore") }, 1140 {"ident", &flag_no_ident, 0, 1141 N_("Process #ident directives") }, 1142 { "peephole2", &flag_peephole2, 1, 1143 N_("Enables an rtl peephole pass run before sched2") }, 1144 { "guess-branch-probability", &flag_guess_branch_prob, 1, 1145 N_("Enables guessing of branch probabilities") }, 1146 {"math-errno", &flag_errno_math, 1, 1147 N_("Set errno after built-in math functions") }, 1148 {"trapping-math", &flag_trapping_math, 1, 1149 N_("Floating-point operations can trap") }, 1150 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1, 1151 N_("Allow math optimizations that may violate IEEE or ANSI standards") }, 1152 {"bounded-pointers", &flag_bounded_pointers, 1, 1153 N_("Compile pointers as triples: value, base & end") }, 1154 {"bounds-check", &flag_bounds_check, 1, 1155 N_("Generate code to check bounds before dereferencing pointers and arrays") }, 1156 {"single-precision-constant", &flag_single_precision_constant, 1, 1157 N_("Convert floating point constant to single precision constant") }, 1158 {"time-report", &time_report, 1, 1159 N_("Report time taken by each compiler pass at end of run") }, 1160 {"mem-report", &mem_report, 1, 1161 N_("Report on permanent memory allocation at end of run") }, 1162 { "trapv", &flag_trapv, 1, 1163 N_("Trap for signed overflow in addition / subtraction / multiplication") }, 1164}; 1165 1166/* Table of language-specific options. */ 1167 1168static const struct lang_opt 1169{ 1170 const char *const option; 1171 const char *const description; 1172} 1173documented_lang_options[] = 1174{ 1175 /* In order not to overload the --help output, the convention 1176 used here is to only describe those options which are not 1177 enabled by default. */ 1178 1179 { "-ansi", 1180 N_("Compile just for ISO C89") }, 1181 { "-fallow-single-precision", 1182 N_("Do not promote floats to double if using -traditional") }, 1183 { "-std= ", 1184 N_("Determine language standard") }, 1185 1186 { "-fsigned-bitfields", "" }, 1187 { "-funsigned-bitfields", 1188 N_("Make bit-fields by unsigned by default") }, 1189 { "-fno-signed-bitfields", "" }, 1190 { "-fno-unsigned-bitfields","" }, 1191 { "-fsigned-char", 1192 N_("Make 'char' be signed by default") }, 1193 { "-funsigned-char", 1194 N_("Make 'char' be unsigned by default") }, 1195 { "-fno-signed-char", "" }, 1196 { "-fno-unsigned-char", "" }, 1197 1198 { "-ftraditional", "" }, 1199 { "-traditional", 1200 N_("Attempt to support traditional K&R style C") }, 1201 { "-fnotraditional", "" }, 1202 { "-fno-traditional", "" }, 1203 1204 { "-fasm", "" }, 1205 { "-fno-asm", 1206 N_("Do not recognize the 'asm' keyword") }, 1207 { "-fbuiltin", "" }, 1208 { "-fno-builtin", 1209 N_("Do not recognize any built in functions") }, 1210 { "-fhosted", 1211 N_("Assume normal C execution environment") }, 1212 { "-fno-hosted", "" }, 1213 { "-ffreestanding", 1214 N_("Assume that standard libraries & main might not exist") }, 1215 { "-fno-freestanding", "" }, 1216 { "-fcond-mismatch", 1217 N_("Allow different types as args of ? operator") }, 1218 { "-fno-cond-mismatch", "" }, 1219 { "-fdollars-in-identifiers", 1220 N_("Allow the use of $ inside identifiers") }, 1221 { "-fno-dollars-in-identifiers", "" }, 1222 { "-fpreprocessed", "" }, 1223 { "-fno-preprocessed", "" }, 1224 { "-fshort-double", 1225 N_("Use the same size for double as for float") }, 1226 { "-fno-short-double", "" }, 1227 { "-fshort-enums", 1228 N_("Use the smallest fitting integer to hold enums") }, 1229 { "-fno-short-enums", "" }, 1230 { "-fshort-wchar", 1231 N_("Override the underlying type for wchar_t to `unsigned short'") }, 1232 { "-fno-short-wchar", "" }, 1233 1234 { "-Wall", 1235 N_("Enable most warning messages") }, 1236 { "-Wbad-function-cast", 1237 N_("Warn about casting functions to incompatible types") }, 1238 { "-Wno-bad-function-cast", "" }, 1239 { "-Wno-missing-noreturn", "" }, 1240 { "-Wmissing-format-attribute", 1241 N_("Warn about functions which might be candidates for format attributes") }, 1242 { "-Wno-missing-format-attribute", "" }, 1243 { "-Wcast-qual", 1244 N_("Warn about casts which discard qualifiers") }, 1245 { "-Wno-cast-qual", "" }, 1246 { "-Wchar-subscripts", 1247 N_("Warn about subscripts whose type is 'char'") }, 1248 { "-Wno-char-subscripts", "" }, 1249 { "-Wcomment", 1250 N_("Warn if nested comments are detected") }, 1251 { "-Wno-comment", "" }, 1252 { "-Wcomments", 1253 N_("Warn if nested comments are detected") }, 1254 { "-Wno-comments", "" }, 1255 { "-Wconversion", 1256 N_("Warn about possibly confusing type conversions") }, 1257 { "-Wno-conversion", "" }, 1258 { "-Wformat", 1259 N_("Warn about printf/scanf/strftime/strfmon format anomalies") }, 1260 { "-Wno-format", "" }, 1261 { "-Wformat-y2k", "" }, 1262 { "-Wno-format-y2k", 1263 N_("Don't warn about strftime formats yielding 2 digit years") }, 1264 { "-Wformat-extra-args", "" }, 1265 { "-Wno-format-extra-args", 1266 N_("Don't warn about too many arguments to format functions") }, 1267 { "-Wformat-nonliteral", 1268 N_("Warn about non-string-literal format strings") }, 1269 { "-Wno-format-nonliteral", "" }, 1270 { "-Wformat-security", 1271 N_("Warn about possible security problems with format functions") }, 1272 { "-Wno-format-security", "" }, 1273 { "-Wimplicit-function-declaration", 1274 N_("Warn about implicit function declarations") }, 1275 { "-Wno-implicit-function-declaration", "" }, 1276 { "-Werror-implicit-function-declaration", "" }, 1277 { "-Wimplicit-int", 1278 N_("Warn when a declaration does not specify a type") }, 1279 { "-Wno-implicit-int", "" }, 1280 { "-Wimplicit", "" }, 1281 { "-Wno-implicit", "" }, 1282 { "-Wimport", 1283 N_("Warn about the use of the #import directive") }, 1284 { "-Wno-import", "" }, 1285 { "-Wlong-long","" }, 1286 { "-Wno-long-long", 1287 N_("Do not warn about using 'long long' when -pedantic") }, 1288 { "-Wmain", 1289 N_("Warn about suspicious declarations of main") }, 1290 { "-Wno-main", "" }, 1291 { "-Wmissing-braces", 1292 N_("Warn about possibly missing braces around initializers") }, 1293 { "-Wno-missing-braces", "" }, 1294 { "-Wmissing-declarations", 1295 N_("Warn about global funcs without previous declarations") }, 1296 { "-Wno-missing-declarations", "" }, 1297 { "-Wmissing-prototypes", 1298 N_("Warn about global funcs without prototypes") }, 1299 { "-Wno-missing-prototypes", "" }, 1300 { "-Wmultichar", 1301 N_("Warn about use of multicharacter literals") }, 1302 { "-Wno-multichar", "" }, 1303 { "-Wnested-externs", 1304 N_("Warn about externs not at file scope level") }, 1305 { "-Wno-nested-externs", "" }, 1306 { "-Wparentheses", 1307 N_("Warn about possible missing parentheses") }, 1308 { "-Wno-parentheses", "" }, 1309 { "-Wsequence-point", 1310 N_("Warn about possible violations of sequence point rules") }, 1311 { "-Wno-sequence-point", "" }, 1312 { "-Wpointer-arith", 1313 N_("Warn about function pointer arithmetic") }, 1314 { "-Wno-pointer-arith", "" }, 1315 { "-Wredundant-decls", 1316 N_("Warn about multiple declarations of the same object") }, 1317 { "-Wno-redundant-decls", "" }, 1318 { "-Wsign-compare", 1319 N_("Warn about signed/unsigned comparisons") }, 1320 { "-Wno-sign-compare", "" }, 1321 { "-Wfloat-equal", 1322 N_("Warn about testing equality of floating point numbers") }, 1323 { "-Wno-float-equal", "" }, 1324 { "-Wunknown-pragmas", 1325 N_("Warn about unrecognized pragmas") }, 1326 { "-Wno-unknown-pragmas", "" }, 1327 { "-Wstrict-prototypes", 1328 N_("Warn about non-prototyped function decls") }, 1329 { "-Wno-strict-prototypes", "" }, 1330 { "-Wtraditional", 1331 N_("Warn about constructs whose meaning change in ISO C") }, 1332 { "-Wno-traditional", "" }, 1333 { "-Wtrigraphs", 1334 N_("Warn when trigraphs are encountered") }, 1335 { "-Wno-trigraphs", "" }, 1336 { "-Wundef", "" }, 1337 { "-Wno-undef", "" }, 1338 { "-Wwrite-strings", 1339 N_("Mark strings as 'const char *'") }, 1340 { "-Wno-write-strings", "" }, 1341 1342#define DEFINE_LANG_NAME(NAME) { NULL, NAME }, 1343 1344#include "options.h" 1345 1346}; 1347 1348/* Here is a table, controlled by the tm.h file, listing each -m switch 1349 and which bits in `target_switches' it should set or clear. 1350 If VALUE is positive, it is bits to set. 1351 If VALUE is negative, -VALUE is bits to clear. 1352 (The sign bit is not used so there is no confusion.) */ 1353 1354static const struct 1355{ 1356 const char *const name; 1357 const int value; 1358 const char *const description; 1359} 1360target_switches [] = TARGET_SWITCHES; 1361 1362/* This table is similar, but allows the switch to have a value. */ 1363 1364#ifdef TARGET_OPTIONS 1365static const struct 1366{ 1367 const char *const prefix; 1368 const char **const variable; 1369 const char *const description; 1370} 1371target_options [] = TARGET_OPTIONS; 1372#endif 1373 1374/* Options controlling warnings. */ 1375 1376/* Don't print warning messages. -w. */ 1377 1378int inhibit_warnings = 0; 1379 1380/* Don't suppress warnings from system headers. -Wsystem-headers. */ 1381 1382int warn_system_headers = 0; 1383 1384/* Print various extra warnings. -W. */ 1385 1386int extra_warnings = 0; 1387 1388/* Treat warnings as errors. -Werror. */ 1389 1390int warnings_are_errors = 0; 1391 1392/* Nonzero to warn about unused variables, functions et.al. */ 1393 1394int warn_unused_function; 1395int warn_unused_label; 1396int warn_unused_parameter; 1397int warn_unused_variable; 1398int warn_unused_value; 1399 1400/* Nonzero to warn about code which is never reached. */ 1401 1402int warn_notreached; 1403 1404/* Nonzero to warn about variables used before they are initialized. */ 1405 1406int warn_uninitialized; 1407 1408/* Nonzero means warn about all declarations which shadow others. */ 1409 1410int warn_shadow; 1411 1412/* Warn if a switch on an enum fails to have a case for every enum value. */ 1413 1414int warn_switch; 1415 1416/* Nonzero means warn about function definitions that default the return type 1417 or that use a null return and have a return-type other than void. */ 1418 1419int warn_return_type; 1420 1421/* Nonzero means warn about pointer casts that increase the required 1422 alignment of the target type (and might therefore lead to a crash 1423 due to a misaligned access). */ 1424 1425int warn_cast_align; 1426 1427/* Nonzero means warn about any objects definitions whose size is larger 1428 than N bytes. Also want about function definitions whose returned 1429 values are larger than N bytes. The value N is in `larger_than_size'. */ 1430 1431int warn_larger_than; 1432HOST_WIDE_INT larger_than_size; 1433 1434/* Nonzero means warn if inline function is too large. */ 1435 1436int warn_inline; 1437 1438/* Warn if a function returns an aggregate, 1439 since there are often incompatible calling conventions for doing this. */ 1440 1441int warn_aggregate_return; 1442 1443/* Warn if packed attribute on struct is unnecessary and inefficient. */ 1444 1445int warn_packed; 1446 1447/* Warn when gcc pads a structure to an alignment boundary. */ 1448 1449int warn_padded; 1450 1451/* Warn when an optimization pass is disabled. */ 1452 1453int warn_disabled_optimization; 1454 1455/* Warn about functions which might be candidates for attribute noreturn. */ 1456 1457int warn_missing_noreturn; 1458 1459/* Nonzero means warn about uses of __attribute__((deprecated)) 1460 declarations. */ 1461 1462int warn_deprecated_decl = 1; 1463 1464/* Likewise for -W. */ 1465 1466static const lang_independent_options W_options[] = 1467{ 1468 {"unused-function", &warn_unused_function, 1, 1469 N_("Warn when a function is unused") }, 1470 {"unused-label", &warn_unused_label, 1, 1471 N_("Warn when a label is unused") }, 1472 {"unused-parameter", &warn_unused_parameter, 1, 1473 N_("Warn when a function parameter is unused") }, 1474 {"unused-variable", &warn_unused_variable, 1, 1475 N_("Warn when a variable is unused") }, 1476 {"unused-value", &warn_unused_value, 1, 1477 N_("Warn when an expression value is unused") }, 1478 {"system-headers", &warn_system_headers, 1, 1479 N_("Do not suppress warnings from system headers") }, 1480 {"error", &warnings_are_errors, 1, 1481 N_("Treat all warnings as errors") }, 1482 {"shadow", &warn_shadow, 1, 1483 N_("Warn when one local variable shadows another") }, 1484 {"switch", &warn_switch, 1, 1485 N_("Warn about enumerated switches missing a specific case") }, 1486 {"aggregate-return", &warn_aggregate_return, 1, 1487 N_("Warn about returning structures, unions or arrays") }, 1488 {"cast-align", &warn_cast_align, 1, 1489 N_("Warn about pointer casts which increase alignment") }, 1490 {"unreachable-code", &warn_notreached, 1, 1491 N_("Warn about code that will never be executed") }, 1492 {"uninitialized", &warn_uninitialized, 1, 1493 N_("Warn about uninitialized automatic variables") }, 1494 {"inline", &warn_inline, 1, 1495 N_("Warn when an inlined function cannot be inlined") }, 1496 {"packed", &warn_packed, 1, 1497 N_("Warn when the packed attribute has no effect on struct layout") }, 1498 {"padded", &warn_padded, 1, 1499 N_("Warn when padding is required to align struct members") }, 1500 {"disabled-optimization", &warn_disabled_optimization, 1, 1501 N_("Warn when an optimization pass is disabled") }, 1502 {"deprecated-declarations", &warn_deprecated_decl, 1, 1503 N_("Warn about uses of __attribute__((deprecated)) declarations") }, 1504 {"missing-noreturn", &warn_missing_noreturn, 1, 1505 N_("Warn about functions which might be candidates for attribute noreturn") } 1506}; 1507 1508void 1509set_Wunused (setting) 1510 int setting; 1511{ 1512 warn_unused_function = setting; 1513 warn_unused_label = setting; 1514 /* Unused function parameter warnings are reported when either ``-W 1515 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate 1516 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */ 1517 if (!setting) 1518 warn_unused_parameter = 0; 1519 else if (!warn_unused_parameter) 1520 warn_unused_parameter = -1; 1521 warn_unused_variable = setting; 1522 warn_unused_value = setting; 1523} 1524 1525/* The following routines are useful in setting all the flags that 1526 -ffast-math and -fno-fast-math imply. */ 1527 1528void 1529set_fast_math_flags () 1530{ 1531 flag_trapping_math = 0; 1532 flag_unsafe_math_optimizations = 1; 1533 flag_errno_math = 0; 1534} 1535 1536void 1537set_no_fast_math_flags () 1538{ 1539 flag_trapping_math = 1; 1540 flag_unsafe_math_optimizations = 0; 1541 flag_errno_math = 1; 1542} 1543 1544 1545/* Output files for assembler code (real compiler output) 1546 and debugging dumps. */ 1547 1548FILE *asm_out_file; 1549FILE *aux_info_file; 1550FILE *rtl_dump_file = NULL; 1551 1552/* Decode the string P as an integral parameter. 1553 If the string is indeed an integer return its numeric value else 1554 issue an Invalid Option error for the option PNAME and return DEFVAL. 1555 If PNAME is zero just return DEFVAL, do not call error. */ 1556 1557int 1558read_integral_parameter (p, pname, defval) 1559 const char *p; 1560 const char *pname; 1561 const int defval; 1562{ 1563 const char *endp = p; 1564 1565 while (*endp) 1566 { 1567 if (ISDIGIT (*endp)) 1568 endp++; 1569 else 1570 break; 1571 } 1572 1573 if (*endp != 0) 1574 { 1575 if (pname != 0) 1576 error ("invalid option `%s'", pname); 1577 return defval; 1578 } 1579 1580 return atoi (p); 1581} 1582 1583 1584/* This is the default decl_printable_name function. */ 1585 1586static const char * 1587decl_name (decl, verbosity) 1588 tree decl; 1589 int verbosity ATTRIBUTE_UNUSED; 1590{ 1591 return IDENTIFIER_POINTER (DECL_NAME (decl)); 1592} 1593 1594 1595/* This calls abort and is used to avoid problems when abort if a macro. 1596 It is used when we need to pass the address of abort. */ 1597 1598void 1599do_abort () 1600{ 1601 abort (); 1602} 1603 1604/* When `malloc.c' is compiled with `rcheck' defined, 1605 it calls this function to report clobberage. */ 1606 1607void 1608botch (s) 1609 const char *s ATTRIBUTE_UNUSED; 1610{ 1611 abort (); 1612} 1613 1614/* Return the logarithm of X, base 2, considering X unsigned, 1615 if X is a power of 2. Otherwise, returns -1. 1616 1617 This should be used via the `exact_log2' macro. */ 1618 1619int 1620exact_log2_wide (x) 1621 unsigned HOST_WIDE_INT x; 1622{ 1623 int log = 0; 1624 /* Test for 0 or a power of 2. */ 1625 if (x == 0 || x != (x & -x)) 1626 return -1; 1627 while ((x >>= 1) != 0) 1628 log++; 1629 return log; 1630} 1631 1632/* Given X, an unsigned number, return the largest int Y such that 2**Y <= X. 1633 If X is 0, return -1. 1634 1635 This should be used via the floor_log2 macro. */ 1636 1637int 1638floor_log2_wide (x) 1639 unsigned HOST_WIDE_INT x; 1640{ 1641 int log = -1; 1642 while (x != 0) 1643 log++, 1644 x >>= 1; 1645 return log; 1646} 1647 1648static int float_handler_set; 1649int float_handled; 1650jmp_buf float_handler; 1651 1652/* Signals actually come here. */ 1653 1654static void 1655float_signal (signo) 1656 /* If this is missing, some compilers complain. */ 1657 int signo ATTRIBUTE_UNUSED; 1658{ 1659 if (float_handled == 0) 1660 crash_signal (signo); 1661 float_handled = 0; 1662 1663 /* On System-V derived systems, we must reinstall the signal handler. 1664 This is harmless on BSD-derived systems. */ 1665 signal (SIGFPE, float_signal); 1666 longjmp (float_handler, 1); 1667} 1668 1669/* Specify where to longjmp to when a floating arithmetic error happens. 1670 If HANDLER is 0, it means don't handle the errors any more. */ 1671 1672static void 1673set_float_handler (handler) 1674 jmp_buf handler; 1675{ 1676 float_handled = (handler != 0); 1677 if (handler) 1678 memcpy (float_handler, handler, sizeof (float_handler)); 1679 1680 if (float_handled && ! float_handler_set) 1681 { 1682 signal (SIGFPE, float_signal); 1683 float_handler_set = 1; 1684 } 1685} 1686 1687/* This is a wrapper function for code which might elicit an 1688 arithmetic exception. That code should be passed in as a function 1689 pointer FN, and one argument DATA. DATA is usually a struct which 1690 contains the real input and output for function FN. This function 1691 returns 0 (failure) if longjmp was called (i.e. an exception 1692 occurred.) It returns 1 (success) otherwise. */ 1693 1694int 1695do_float_handler (fn, data) 1696 void (*fn) PARAMS ((PTR)); 1697 PTR data; 1698{ 1699 jmp_buf buf; 1700 1701 if (setjmp (buf)) 1702 { 1703 /* We got here via longjmp () caused by an exception in function 1704 fn (). */ 1705 set_float_handler (NULL); 1706 return 0; 1707 } 1708 1709 set_float_handler (buf); 1710 (*fn)(data); 1711 set_float_handler (NULL); 1712 return 1; 1713} 1714 1715/* Handler for fatal signals, such as SIGSEGV. These are transformed 1716 into ICE messages, which is much more user friendly. */ 1717 1718static void 1719crash_signal (signo) 1720 int signo; 1721{ 1722 internal_error ("internal error: %s", strsignal (signo)); 1723} 1724 1725/* Strip off a legitimate source ending from the input string NAME of 1726 length LEN. Rather than having to know the names used by all of 1727 our front ends, we strip off an ending of a period followed by 1728 up to five characters. (Java uses ".class".) */ 1729 1730void 1731strip_off_ending (name, len) 1732 char *name; 1733 int len; 1734{ 1735 int i; 1736 for (i = 2; i < 6 && len > i; i++) 1737 { 1738 if (name[len - i] == '.') 1739 { 1740 name[len - i] = '\0'; 1741 break; 1742 } 1743 } 1744} 1745 1746/* Output a quoted string. */ 1747 1748void 1749output_quoted_string (asm_file, string) 1750 FILE *asm_file; 1751 const char *string; 1752{ 1753#ifdef OUTPUT_QUOTED_STRING 1754 OUTPUT_QUOTED_STRING (asm_file, string); 1755#else 1756 char c; 1757 1758 putc ('\"', asm_file); 1759 while ((c = *string++) != 0) 1760 { 1761 if (ISPRINT (c)) 1762 { 1763 if (c == '\"' || c == '\\') 1764 putc ('\\', asm_file); 1765 putc (c, asm_file); 1766 } 1767 else 1768 fprintf (asm_file, "\\%03o", c); 1769 } 1770 putc ('\"', asm_file); 1771#endif 1772} 1773 1774/* Output a file name in the form wanted by System V. */ 1775 1776void 1777output_file_directive (asm_file, input_name) 1778 FILE *asm_file; 1779 const char *input_name; 1780{ 1781 int len = strlen (input_name); 1782 const char *na = input_name + len; 1783 1784 /* NA gets INPUT_NAME sans directory names. */ 1785 while (na > input_name) 1786 { 1787 if (IS_DIR_SEPARATOR (na[-1])) 1788 break; 1789 na--; 1790 } 1791 1792#ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME 1793 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na); 1794#else 1795#ifdef ASM_OUTPUT_SOURCE_FILENAME 1796 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na); 1797#else 1798 fprintf (asm_file, "\t.file\t"); 1799 output_quoted_string (asm_file, na); 1800 fputc ('\n', asm_file); 1801#endif 1802#endif 1803} 1804 1805/* Routine to open a dump file. Return true if the dump file is enabled. */ 1806 1807static int 1808open_dump_file (index, decl) 1809 enum dump_file_index index; 1810 tree decl; 1811{ 1812 char *dump_name; 1813 const char *open_arg; 1814 char seq[16]; 1815 1816 if (! dump_file[index].enabled) 1817 return 0; 1818 1819 timevar_push (TV_DUMP); 1820 if (rtl_dump_file != NULL) 1821 fclose (rtl_dump_file); 1822 1823 sprintf (seq, DUMPFILE_FORMAT, index); 1824 1825 if (! dump_file[index].initialized) 1826 { 1827 /* If we've not initialized the files, do so now. */ 1828 if (graph_dump_format != no_graph 1829 && dump_file[index].graph_dump_p) 1830 { 1831 dump_name = concat (seq, dump_file[index].extension, NULL); 1832 clean_graph_dump_file (dump_base_name, dump_name); 1833 free (dump_name); 1834 } 1835 dump_file[index].initialized = 1; 1836 open_arg = "w"; 1837 } 1838 else 1839 open_arg = "a"; 1840 1841 dump_name = concat (dump_base_name, seq, 1842 dump_file[index].extension, NULL); 1843 1844 rtl_dump_file = fopen (dump_name, open_arg); 1845 if (rtl_dump_file == NULL) 1846 fatal_io_error ("can't open %s", dump_name); 1847 1848 free (dump_name); 1849 1850 if (decl) 1851 fprintf (rtl_dump_file, "\n;; Function %s\n\n", 1852 decl_printable_name (decl, 2)); 1853 1854 timevar_pop (TV_DUMP); 1855 return 1; 1856} 1857 1858/* Routine to close a dump file. */ 1859 1860static void 1861close_dump_file (index, func, insns) 1862 enum dump_file_index index; 1863 void (*func) PARAMS ((FILE *, rtx)); 1864 rtx insns; 1865{ 1866 if (! rtl_dump_file) 1867 return; 1868 1869 timevar_push (TV_DUMP); 1870 if (insns 1871 && graph_dump_format != no_graph 1872 && dump_file[index].graph_dump_p) 1873 { 1874 char seq[16]; 1875 char *suffix; 1876 1877 sprintf (seq, DUMPFILE_FORMAT, index); 1878 suffix = concat (seq, dump_file[index].extension, NULL); 1879 print_rtl_graph_with_bb (dump_base_name, suffix, insns); 1880 free (suffix); 1881 } 1882 1883 if (func && insns) 1884 func (rtl_dump_file, insns); 1885 1886 fflush (rtl_dump_file); 1887 fclose (rtl_dump_file); 1888 1889 rtl_dump_file = NULL; 1890 timevar_pop (TV_DUMP); 1891} 1892 1893/* Do any final processing required for the declarations in VEC, of 1894 which there are LEN. We write out inline functions and variables 1895 that have been deferred until this point, but which are required. 1896 Returns non-zero if anything was put out. */ 1897 1898int 1899wrapup_global_declarations (vec, len) 1900 tree *vec; 1901 int len; 1902{ 1903 tree decl; 1904 int i; 1905 int reconsider; 1906 int output_something = 0; 1907 1908 for (i = 0; i < len; i++) 1909 { 1910 decl = vec[i]; 1911 1912 /* We're not deferring this any longer. */ 1913 DECL_DEFER_OUTPUT (decl) = 0; 1914 1915 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0 1916 && incomplete_decl_finalize_hook != 0) 1917 (*incomplete_decl_finalize_hook) (decl); 1918 } 1919 1920 /* Now emit any global variables or functions that we have been 1921 putting off. We need to loop in case one of the things emitted 1922 here references another one which comes earlier in the list. */ 1923 do 1924 { 1925 reconsider = 0; 1926 for (i = 0; i < len; i++) 1927 { 1928 decl = vec[i]; 1929 1930 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl)) 1931 continue; 1932 1933 /* Don't write out static consts, unless we still need them. 1934 1935 We also keep static consts if not optimizing (for debugging), 1936 unless the user specified -fno-keep-static-consts. 1937 ??? They might be better written into the debug information. 1938 This is possible when using DWARF. 1939 1940 A language processor that wants static constants to be always 1941 written out (even if it is not used) is responsible for 1942 calling rest_of_decl_compilation itself. E.g. the C front-end 1943 calls rest_of_decl_compilation from finish_decl. 1944 One motivation for this is that is conventional in some 1945 environments to write things like: 1946 static const char rcsid[] = "... version string ..."; 1947 intending to force the string to be in the executable. 1948 1949 A language processor that would prefer to have unneeded 1950 static constants "optimized away" would just defer writing 1951 them out until here. E.g. C++ does this, because static 1952 constants are often defined in header files. 1953 1954 ??? A tempting alternative (for both C and C++) would be 1955 to force a constant to be written if and only if it is 1956 defined in a main file, as opposed to an include file. */ 1957 1958 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)) 1959 { 1960 bool needed = 1; 1961 1962 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))) 1963 /* needed */; 1964 else if (DECL_COMDAT (decl)) 1965 needed = 0; 1966 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl) 1967 && (optimize || !flag_keep_static_consts 1968 || DECL_ARTIFICIAL (decl))) 1969 needed = 0; 1970 1971 if (needed) 1972 { 1973 reconsider = 1; 1974 rest_of_decl_compilation (decl, NULL, 1, 1); 1975 } 1976 } 1977 1978 if (TREE_CODE (decl) == FUNCTION_DECL 1979 && DECL_INITIAL (decl) != 0 1980 && DECL_SAVED_INSNS (decl) != 0 1981 && (flag_keep_inline_functions 1982 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl)) 1983 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))) 1984 { 1985 reconsider = 1; 1986 output_inline_function (decl); 1987 } 1988 } 1989 1990 if (reconsider) 1991 output_something = 1; 1992 } 1993 while (reconsider); 1994 1995 return output_something; 1996} 1997 1998/* Issue appropriate warnings for the global declarations in VEC (of 1999 which there are LEN). Output debugging information for them. */ 2000 2001void 2002check_global_declarations (vec, len) 2003 tree *vec; 2004 int len; 2005{ 2006 tree decl; 2007 int i; 2008 2009 for (i = 0; i < len; i++) 2010 { 2011 decl = vec[i]; 2012 2013 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl) 2014 && ! TREE_ASM_WRITTEN (decl)) 2015 /* Cancel the RTL for this decl so that, if debugging info 2016 output for global variables is still to come, 2017 this one will be omitted. */ 2018 SET_DECL_RTL (decl, NULL_RTX); 2019 2020 /* Warn about any function 2021 declared static but not defined. 2022 We don't warn about variables, 2023 because many programs have static variables 2024 that exist only to get some text into the object file. */ 2025 if (TREE_CODE (decl) == FUNCTION_DECL 2026 && (warn_unused_function 2027 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))) 2028 && DECL_INITIAL (decl) == 0 2029 && DECL_EXTERNAL (decl) 2030 && ! DECL_ARTIFICIAL (decl) 2031 && ! TREE_PUBLIC (decl)) 2032 { 2033 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))) 2034 pedwarn_with_decl (decl, 2035 "`%s' used but never defined"); 2036 else 2037 warning_with_decl (decl, 2038 "`%s' declared `static' but never defined"); 2039 /* This symbol is effectively an "extern" declaration now. */ 2040 TREE_PUBLIC (decl) = 1; 2041 assemble_external (decl); 2042 } 2043 2044 /* Warn about static fns or vars defined but not used, 2045 but not about inline functions or static consts 2046 since defining those in header files is normal practice. */ 2047 if (((warn_unused_function 2048 && TREE_CODE (decl) == FUNCTION_DECL && ! DECL_INLINE (decl)) 2049 || (warn_unused_variable 2050 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl))) 2051 && ! DECL_IN_SYSTEM_HEADER (decl) 2052 && ! DECL_EXTERNAL (decl) 2053 && ! TREE_PUBLIC (decl) 2054 && ! TREE_USED (decl) 2055 && (TREE_CODE (decl) == FUNCTION_DECL || ! DECL_REGISTER (decl)) 2056 /* The TREE_USED bit for file-scope decls 2057 is kept in the identifier, to handle multiple 2058 external decls in different scopes. */ 2059 && ! TREE_USED (DECL_NAME (decl))) 2060 warning_with_decl (decl, "`%s' defined but not used"); 2061 2062 timevar_push (TV_SYMOUT); 2063 (*debug_hooks->global_decl) (decl); 2064 timevar_pop (TV_SYMOUT); 2065 } 2066} 2067 2068/* Save the current INPUT_FILENAME and LINENO on the top entry in the 2069 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the 2070 INPUT_FILENAME and LINENO accordingly. */ 2071 2072void 2073push_srcloc (file, line) 2074 const char *file; 2075 int line; 2076{ 2077 struct file_stack *fs; 2078 2079 if (input_file_stack) 2080 { 2081 input_file_stack->name = input_filename; 2082 input_file_stack->line = lineno; 2083 } 2084 2085 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack)); 2086 fs->name = input_filename = file; 2087 fs->line = lineno = line; 2088 fs->indent_level = 0; 2089 fs->next = input_file_stack; 2090 input_file_stack = fs; 2091 input_file_stack_tick++; 2092} 2093 2094/* Pop the top entry off the stack of presently open source files. 2095 Restore the INPUT_FILENAME and LINENO from the new topmost entry on 2096 the stack. */ 2097 2098void 2099pop_srcloc () 2100{ 2101 struct file_stack *fs; 2102 2103 fs = input_file_stack; 2104 input_file_stack = fs->next; 2105 free (fs); 2106 input_file_stack_tick++; 2107 /* The initial source file is never popped. */ 2108 if (!input_file_stack) 2109 abort (); 2110 input_filename = input_file_stack->name; 2111 lineno = input_file_stack->line; 2112} 2113 2114/* Compile an entire translation unit. Write a file of assembly 2115 output and various debugging dumps. */ 2116 2117static void 2118compile_file () 2119{ 2120 tree globals; 2121 2122 /* Initialize yet another pass. */ 2123 2124 init_final (main_input_filename); 2125 init_branch_prob (dump_base_name); 2126 2127 timevar_push (TV_PARSE); 2128 2129 /* Call the parser, which parses the entire file 2130 (calling rest_of_compilation for each function). */ 2131 yyparse (); 2132 2133 /* In case there were missing block closers, 2134 get us back to the global binding level. */ 2135 (*lang_hooks.clear_binding_stack) (); 2136 2137 /* Compilation is now finished except for writing 2138 what's left of the symbol table output. */ 2139 2140 timevar_pop (TV_PARSE); 2141 2142 if (flag_syntax_only) 2143 return; 2144 2145 globals = getdecls (); 2146 2147 /* Really define vars that have had only a tentative definition. 2148 Really output inline functions that must actually be callable 2149 and have not been output so far. */ 2150 2151 { 2152 int len = list_length (globals); 2153 tree *vec = (tree *) xmalloc (sizeof (tree) * len); 2154 int i; 2155 tree decl; 2156 2157 /* Process the decls in reverse order--earliest first. 2158 Put them into VEC from back to front, then take out from front. */ 2159 2160 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl)) 2161 vec[len - i - 1] = decl; 2162 2163 wrapup_global_declarations (vec, len); 2164 2165 /* This must occur after the loop to output deferred functions. Else 2166 the profiler initializer would not be emitted if all the functions 2167 in this compilation unit were deferred. 2168 2169 output_func_start_profiler can not cause any additional functions or 2170 data to need to be output, so it need not be in the deferred function 2171 loop above. */ 2172 output_func_start_profiler (); 2173 2174 check_global_declarations (vec, len); 2175 2176 /* Clean up. */ 2177 free (vec); 2178 } 2179 2180 /* Write out any pending weak symbol declarations. */ 2181 2182 weak_finish (); 2183 2184 /* Do dbx symbols. */ 2185 timevar_push (TV_SYMOUT); 2186 2187#ifdef DWARF2_UNWIND_INFO 2188 if (dwarf2out_do_frame ()) 2189 dwarf2out_frame_finish (); 2190#endif 2191 2192 (*debug_hooks->finish) (main_input_filename); 2193 timevar_pop (TV_SYMOUT); 2194 2195 /* Output some stuff at end of file if nec. */ 2196 2197 dw2_output_indirect_constants (); 2198 2199 end_final (dump_base_name); 2200 2201 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities) 2202 { 2203 timevar_push (TV_DUMP); 2204 open_dump_file (DFI_bp, NULL); 2205 2206 end_branch_prob (); 2207 2208 close_dump_file (DFI_bp, NULL, NULL_RTX); 2209 timevar_pop (TV_DUMP); 2210 } 2211 2212#ifdef ASM_FILE_END 2213 ASM_FILE_END (asm_out_file); 2214#endif 2215 2216 /* Attach a special .ident directive to the end of the file to identify 2217 the version of GCC which compiled this code. The format of the .ident 2218 string is patterned after the ones produced by native SVR4 compilers. */ 2219#ifdef IDENT_ASM_OP 2220 if (!flag_no_ident) 2221 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n", 2222 IDENT_ASM_OP, version_string); 2223#endif 2224 2225 if (optimize > 0 && open_dump_file (DFI_combine, NULL)) 2226 { 2227 timevar_push (TV_DUMP); 2228 dump_combine_total_stats (rtl_dump_file); 2229 close_dump_file (DFI_combine, NULL, NULL_RTX); 2230 timevar_pop (TV_DUMP); 2231 } 2232} 2233 2234/* This is called from various places for FUNCTION_DECL, VAR_DECL, 2235 and TYPE_DECL nodes. 2236 2237 This does nothing for local (non-static) variables, unless the 2238 variable is a register variable with an ASMSPEC. In that case, or 2239 if the variable is not an automatic, it sets up the RTL and 2240 outputs any assembler code (label definition, storage allocation 2241 and initialization). 2242 2243 DECL is the declaration. If ASMSPEC is nonzero, it specifies 2244 the assembler symbol name to be used. TOP_LEVEL is nonzero 2245 if this declaration is not within a function. */ 2246 2247void 2248rest_of_decl_compilation (decl, asmspec, top_level, at_end) 2249 tree decl; 2250 const char *asmspec; 2251 int top_level; 2252 int at_end; 2253{ 2254 /* Declarations of variables, and of functions defined elsewhere. */ 2255 2256/* The most obvious approach, to put an #ifndef around where 2257 this macro is used, doesn't work since it's inside a macro call. */ 2258#ifndef ASM_FINISH_DECLARE_OBJECT 2259#define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END) 2260#endif 2261 2262 /* We deferred calling assemble_alias so that we could collect 2263 other attributes such as visibility. Emit the alias now. */ 2264 { 2265 tree alias; 2266 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl)); 2267 if (alias) 2268 { 2269 alias = TREE_VALUE (TREE_VALUE (alias)); 2270 alias = get_identifier (TREE_STRING_POINTER (alias)); 2271 assemble_alias (decl, alias); 2272 } 2273 } 2274 2275 /* Forward declarations for nested functions are not "external", 2276 but we need to treat them as if they were. */ 2277 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl) 2278 || TREE_CODE (decl) == FUNCTION_DECL) 2279 { 2280 timevar_push (TV_VARCONST); 2281 if (asmspec) 2282 make_decl_rtl (decl, asmspec); 2283 /* Don't output anything 2284 when a tentative file-scope definition is seen. 2285 But at end of compilation, do output code for them. */ 2286 if (at_end || !DECL_DEFER_OUTPUT (decl)) 2287 assemble_variable (decl, top_level, at_end, 0); 2288 if (decl == last_assemble_variable_decl) 2289 { 2290 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl, 2291 top_level, at_end); 2292 } 2293 timevar_pop (TV_VARCONST); 2294 } 2295 else if (DECL_REGISTER (decl) && asmspec != 0) 2296 { 2297 if (decode_reg_name (asmspec) >= 0) 2298 { 2299 SET_DECL_RTL (decl, NULL_RTX); 2300 make_decl_rtl (decl, asmspec); 2301 } 2302 else 2303 { 2304 error ("invalid register name `%s' for register variable", asmspec); 2305 DECL_REGISTER (decl) = 0; 2306 if (!top_level) 2307 expand_decl (decl); 2308 } 2309 } 2310#if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) 2311 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG) 2312 && TREE_CODE (decl) == TYPE_DECL) 2313 { 2314 timevar_push (TV_SYMOUT); 2315 dbxout_symbol (decl, 0); 2316 timevar_pop (TV_SYMOUT); 2317 } 2318#endif 2319#ifdef SDB_DEBUGGING_INFO 2320 else if (write_symbols == SDB_DEBUG && top_level 2321 && TREE_CODE (decl) == TYPE_DECL) 2322 { 2323 timevar_push (TV_SYMOUT); 2324 sdbout_symbol (decl, 0); 2325 timevar_pop (TV_SYMOUT); 2326 } 2327#endif 2328} 2329 2330/* Called after finishing a record, union or enumeral type. */ 2331 2332void 2333rest_of_type_compilation (type, toplev) 2334#if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO) 2335 tree type; 2336 int toplev; 2337#else 2338 tree type ATTRIBUTE_UNUSED; 2339 int toplev ATTRIBUTE_UNUSED; 2340#endif 2341{ 2342 timevar_push (TV_SYMOUT); 2343#if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) 2344 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG) 2345 dbxout_symbol (TYPE_STUB_DECL (type), !toplev); 2346#endif 2347#ifdef SDB_DEBUGGING_INFO 2348 if (write_symbols == SDB_DEBUG) 2349 sdbout_symbol (TYPE_STUB_DECL (type), !toplev); 2350#endif 2351#ifdef DWARF2_DEBUGGING_INFO 2352 if ((write_symbols == DWARF2_DEBUG 2353 || write_symbols == VMS_AND_DWARF2_DEBUG) 2354 && toplev) 2355 dwarf2out_decl (TYPE_STUB_DECL (type)); 2356#endif 2357 timevar_pop (TV_SYMOUT); 2358} 2359 2360/* This is called from finish_function (within yyparse) 2361 after each top-level definition is parsed. 2362 It is supposed to compile that function or variable 2363 and output the assembler code for it. 2364 After we return, the tree storage is freed. */ 2365 2366void 2367rest_of_compilation (decl) 2368 tree decl; 2369{ 2370 rtx insns; 2371 int tem; 2372 int failure = 0; 2373 int rebuild_label_notes_after_reload; 2374 int register_life_up_to_date; 2375 int cleanup_crossjump; 2376 2377 timevar_push (TV_REST_OF_COMPILATION); 2378 2379 /* Now that we're out of the frontend, we shouldn't have any more 2380 CONCATs anywhere. */ 2381 generating_concat_p = 0; 2382 2383 /* When processing delayed functions, prepare_function_start() won't 2384 have been run to re-initialize it. */ 2385 cse_not_expected = ! optimize; 2386 2387 /* First, make sure that NOTE_BLOCK is set correctly for each 2388 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */ 2389 if (!cfun->x_whole_function_mode_p) 2390 identify_blocks (); 2391 2392 /* In function-at-a-time mode, we do not attempt to keep the BLOCK 2393 tree in sensible shape. So, we just recalculate it here. */ 2394 if (cfun->x_whole_function_mode_p) 2395 reorder_blocks (); 2396 2397 init_flow (); 2398 2399 /* If we are reconsidering an inline function 2400 at the end of compilation, skip the stuff for making it inline. */ 2401 2402 if (DECL_SAVED_INSNS (decl) == 0) 2403 { 2404 int inlinable = 0; 2405 tree parent; 2406 const char *lose; 2407 2408 /* If this is nested inside an inlined external function, pretend 2409 it was only declared. Since we cannot inline such functions, 2410 generating code for this one is not only not necessary but will 2411 confuse some debugging output writers. */ 2412 for (parent = DECL_CONTEXT (current_function_decl); 2413 parent != NULL_TREE; 2414 parent = get_containing_scope (parent)) 2415 if (TREE_CODE (parent) == FUNCTION_DECL 2416 && DECL_INLINE (parent) && DECL_EXTERNAL (parent)) 2417 { 2418 DECL_INITIAL (decl) = 0; 2419 goto exit_rest_of_compilation; 2420 } 2421 2422 /* If requested, consider whether to make this function inline. */ 2423 if ((DECL_INLINE (decl) && !flag_no_inline) 2424 || flag_inline_functions) 2425 { 2426 timevar_push (TV_INTEGRATION); 2427 lose = function_cannot_inline_p (decl); 2428 timevar_pop (TV_INTEGRATION); 2429 if (lose || ! optimize) 2430 { 2431 if (warn_inline && DECL_INLINE (decl)) 2432 warning_with_decl (decl, lose); 2433 DECL_ABSTRACT_ORIGIN (decl) = 0; 2434 /* Don't really compile an extern inline function. 2435 If we can't make it inline, pretend 2436 it was only declared. */ 2437 if (DECL_EXTERNAL (decl)) 2438 { 2439 DECL_INITIAL (decl) = 0; 2440 goto exit_rest_of_compilation; 2441 } 2442 } 2443 else 2444 /* ??? Note that this has the effect of making it look 2445 like "inline" was specified for a function if we choose 2446 to inline it. This isn't quite right, but it's 2447 probably not worth the trouble to fix. */ 2448 inlinable = DECL_INLINE (decl) = 1; 2449 } 2450 2451 insns = get_insns (); 2452 2453 /* Dump the rtl code if we are dumping rtl. */ 2454 2455 if (open_dump_file (DFI_rtl, decl)) 2456 { 2457 if (DECL_SAVED_INSNS (decl)) 2458 fprintf (rtl_dump_file, ";; (integrable)\n\n"); 2459 close_dump_file (DFI_rtl, print_rtl, insns); 2460 } 2461 2462 /* Convert from NOTE_INSN_EH_REGION style notes, and do other 2463 sorts of eh initialization. Delay this until after the 2464 initial rtl dump so that we can see the original nesting. */ 2465 convert_from_eh_region_ranges (); 2466 2467 /* If function is inline, and we don't yet know whether to 2468 compile it by itself, defer decision till end of compilation. 2469 finish_compilation will call rest_of_compilation again 2470 for those functions that need to be output. Also defer those 2471 functions that we are supposed to defer. */ 2472 2473 if (inlinable 2474 || (DECL_INLINE (decl) 2475 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl) 2476 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) 2477 && ! flag_keep_inline_functions) 2478 || DECL_EXTERNAL (decl)))) 2479 DECL_DEFER_OUTPUT (decl) = 1; 2480 2481 if (DECL_INLINE (decl)) 2482 /* DWARF wants separate debugging info for abstract and 2483 concrete instances of all inline functions, including those 2484 declared inline but not inlined, and those inlined even 2485 though they weren't declared inline. Conveniently, that's 2486 what DECL_INLINE means at this point. */ 2487 (*debug_hooks->deferred_inline_function) (decl); 2488 2489 if (DECL_DEFER_OUTPUT (decl)) 2490 { 2491 /* If -Wreturn-type, we have to do a bit of compilation. We just 2492 want to call cleanup the cfg to figure out whether or not we can 2493 fall off the end of the function; we do the minimum amount of 2494 work necessary to make that safe. */ 2495 if (warn_return_type) 2496 { 2497 int saved_optimize = optimize; 2498 2499 optimize = 0; 2500 rebuild_jump_labels (insns); 2501 find_exception_handler_labels (); 2502 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2503 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP); 2504 optimize = saved_optimize; 2505 2506 /* CFG is no longer maintained up-to-date. */ 2507 free_bb_for_insn (); 2508 } 2509 2510 current_function_nothrow = nothrow_function_p (); 2511 if (current_function_nothrow) 2512 /* Now we know that this can't throw; set the flag for the benefit 2513 of other functions later in this translation unit. */ 2514 TREE_NOTHROW (current_function_decl) = 1; 2515 2516 timevar_push (TV_INTEGRATION); 2517 save_for_inline (decl); 2518 timevar_pop (TV_INTEGRATION); 2519 DECL_SAVED_INSNS (decl)->inlinable = inlinable; 2520 goto exit_rest_of_compilation; 2521 } 2522 2523 /* If specified extern inline but we aren't inlining it, we are 2524 done. This goes for anything that gets here with DECL_EXTERNAL 2525 set, not just things with DECL_INLINE. */ 2526 if (DECL_EXTERNAL (decl)) 2527 goto exit_rest_of_compilation; 2528 } 2529 2530 /* If we're emitting a nested function, make sure its parent gets 2531 emitted as well. Doing otherwise confuses debug info. */ 2532 { 2533 tree parent; 2534 for (parent = DECL_CONTEXT (current_function_decl); 2535 parent != NULL_TREE; 2536 parent = get_containing_scope (parent)) 2537 if (TREE_CODE (parent) == FUNCTION_DECL) 2538 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1; 2539 } 2540 2541 /* We are now committed to emitting code for this function. Do any 2542 preparation, such as emitting abstract debug info for the inline 2543 before it gets mangled by optimization. */ 2544 if (DECL_INLINE (decl)) 2545 (*debug_hooks->outlining_inline_function) (decl); 2546 2547 /* Remove any notes we don't need. That will make iterating 2548 over the instruction sequence faster, and allow the garbage 2549 collector to reclaim the memory used by the notes. */ 2550 remove_unnecessary_notes (); 2551 reorder_blocks (); 2552 2553 ggc_collect (); 2554 2555 /* Initialize some variables used by the optimizers. */ 2556 init_function_for_compilation (); 2557 2558 if (! DECL_DEFER_OUTPUT (decl)) 2559 TREE_ASM_WRITTEN (decl) = 1; 2560 2561 /* Now that integrate will no longer see our rtl, we need not 2562 distinguish between the return value of this function and the 2563 return value of called functions. Also, we can remove all SETs 2564 of subregs of hard registers; they are only here because of 2565 integrate. Also, we can now initialize pseudos intended to 2566 carry magic hard reg data throughout the function. */ 2567 rtx_equal_function_value_matters = 0; 2568 purge_hard_subreg_sets (get_insns ()); 2569 2570 /* Early return if there were errors. We can run afoul of our 2571 consistency checks, and there's not really much point in fixing them. 2572 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */ 2573 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type) 2574 || errorcount || sorrycount) 2575 goto exit_rest_of_compilation; 2576 2577 /* We may have potential sibling or tail recursion sites. Select one 2578 (of possibly multiple) methods of performing the call. */ 2579 if (flag_optimize_sibling_calls) 2580 { 2581 timevar_push (TV_JUMP); 2582 open_dump_file (DFI_sibling, decl); 2583 2584 optimize_sibling_and_tail_recursive_calls (); 2585 2586 close_dump_file (DFI_sibling, print_rtl, get_insns ()); 2587 timevar_pop (TV_JUMP); 2588 } 2589 2590 /* Complete generation of exception handling code. */ 2591 find_exception_handler_labels (); 2592 if (doing_eh (0)) 2593 { 2594 timevar_push (TV_JUMP); 2595 open_dump_file (DFI_eh, decl); 2596 2597 finish_eh_generation (); 2598 2599 close_dump_file (DFI_eh, print_rtl, get_insns ()); 2600 timevar_pop (TV_JUMP); 2601 } 2602 2603 /* Delay emitting hard_reg_initial_value sets until after EH landing pad 2604 generation, which might create new sets. */ 2605 emit_initial_value_sets (); 2606 2607#ifdef FINALIZE_PIC 2608 /* If we are doing position-independent code generation, now 2609 is the time to output special prologues and epilogues. 2610 We do not want to do this earlier, because it just clutters 2611 up inline functions with meaningless insns. */ 2612 if (flag_pic) 2613 FINALIZE_PIC; 2614#endif 2615 2616 insns = get_insns (); 2617 2618 /* Copy any shared structure that should not be shared. */ 2619 unshare_all_rtl (current_function_decl, insns); 2620 2621#ifdef SETJMP_VIA_SAVE_AREA 2622 /* This must be performed before virtual register instantiation. */ 2623 if (current_function_calls_alloca) 2624 optimize_save_area_alloca (insns); 2625#endif 2626 2627 /* Instantiate all virtual registers. */ 2628 instantiate_virtual_regs (current_function_decl, insns); 2629 2630 open_dump_file (DFI_jump, decl); 2631 2632 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields 2633 are initialized and to compute whether control can drop off the end 2634 of the function. */ 2635 2636 timevar_push (TV_JUMP); 2637 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this 2638 before jump optimization switches branch directions. */ 2639 expected_value_to_br_prob (); 2640 2641 reg_scan (insns, max_reg_num (), 0); 2642 rebuild_jump_labels (insns); 2643 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2644 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP); 2645 2646 /* CFG is no longer maintained up-to-date. */ 2647 free_bb_for_insn (); 2648 copy_loop_headers (insns); 2649 purge_line_number_notes (insns); 2650 2651 timevar_pop (TV_JUMP); 2652 2653 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */ 2654 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl)) 2655 { 2656 close_dump_file (DFI_jump, print_rtl, insns); 2657 goto exit_rest_of_compilation; 2658 } 2659 2660 /* Long term, this should probably move before the jump optimizer too, 2661 but I didn't want to disturb the rtl_dump_and_exit and related 2662 stuff at this time. */ 2663 if (optimize > 0 && flag_ssa) 2664 { 2665 /* Convert to SSA form. */ 2666 2667 timevar_push (TV_TO_SSA); 2668 open_dump_file (DFI_ssa, decl); 2669 2670 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2671 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP); 2672 convert_to_ssa (); 2673 2674 close_dump_file (DFI_ssa, print_rtl_with_bb, insns); 2675 timevar_pop (TV_TO_SSA); 2676 2677 /* Perform sparse conditional constant propagation, if requested. */ 2678 if (flag_ssa_ccp) 2679 { 2680 timevar_push (TV_SSA_CCP); 2681 open_dump_file (DFI_ssa_ccp, decl); 2682 2683 ssa_const_prop (); 2684 2685 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ()); 2686 timevar_pop (TV_SSA_CCP); 2687 } 2688 2689 /* It would be useful to cleanup the CFG at this point, but block 2690 merging and possibly other transformations might leave a PHI 2691 node in the middle of a basic block, which is a strict no-no. */ 2692 2693 /* The SSA implementation uses basic block numbers in its phi 2694 nodes. Thus, changing the control-flow graph or the basic 2695 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (), 2696 may cause problems. */ 2697 2698 if (flag_ssa_dce) 2699 { 2700 /* Remove dead code. */ 2701 2702 timevar_push (TV_SSA_DCE); 2703 open_dump_file (DFI_ssa_dce, decl); 2704 2705 insns = get_insns (); 2706 ssa_eliminate_dead_code(); 2707 2708 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns); 2709 timevar_pop (TV_SSA_DCE); 2710 } 2711 2712 /* Convert from SSA form. */ 2713 2714 timevar_push (TV_FROM_SSA); 2715 open_dump_file (DFI_ussa, decl); 2716 2717 convert_from_ssa (); 2718 /* New registers have been created. Rescan their usage. */ 2719 reg_scan (insns, max_reg_num (), 1); 2720 2721 close_dump_file (DFI_ussa, print_rtl_with_bb, insns); 2722 timevar_pop (TV_FROM_SSA); 2723 2724 ggc_collect (); 2725 /* CFG is no longer maintained up-to-date. */ 2726 free_bb_for_insn (); 2727 } 2728 2729 timevar_push (TV_JUMP); 2730 2731 if (optimize > 0) 2732 { 2733 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2734 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP 2735 | (flag_thread_jumps ? CLEANUP_THREADING : 0)); 2736 2737 /* ??? Run if-conversion before delete_null_pointer_checks, 2738 since the later does not preserve the CFG. This should 2739 be changed -- no since converting if's that are going to 2740 be deleted. */ 2741 timevar_push (TV_IFCVT); 2742 if_convert (0); 2743 timevar_pop (TV_IFCVT); 2744 2745 /* CFG is no longer maintained up-to-date. */ 2746 free_bb_for_insn (); 2747 /* Try to identify useless null pointer tests and delete them. */ 2748 if (flag_delete_null_pointer_checks) 2749 delete_null_pointer_checks (insns); 2750 } 2751 2752 /* Jump optimization, and the removal of NULL pointer checks, may 2753 have reduced the number of instructions substantially. CSE, and 2754 future passes, allocate arrays whose dimensions involve the 2755 maximum instruction UID, so if we can reduce the maximum UID 2756 we'll save big on memory. */ 2757 renumber_insns (rtl_dump_file); 2758 timevar_pop (TV_JUMP); 2759 2760 close_dump_file (DFI_jump, print_rtl, insns); 2761 2762 ggc_collect (); 2763 2764 /* Perform common subexpression elimination. 2765 Nonzero value from `cse_main' means that jumps were simplified 2766 and some code may now be unreachable, so do 2767 jump optimization again. */ 2768 2769 if (optimize > 0) 2770 { 2771 open_dump_file (DFI_cse, decl); 2772 timevar_push (TV_CSE); 2773 2774 reg_scan (insns, max_reg_num (), 1); 2775 2776 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file); 2777 2778 /* If we are not running more CSE passes, then we are no longer 2779 expecting CSE to be run. But always rerun it in a cheap mode. */ 2780 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse; 2781 2782 if (tem || optimize > 1) 2783 { 2784 timevar_push (TV_JUMP); 2785 rebuild_jump_labels (insns); 2786 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2787 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP); 2788 timevar_pop (TV_JUMP); 2789 /* CFG is no longer maintained up-to-date. */ 2790 free_bb_for_insn (); 2791 } 2792 2793 /* Run this after jump optmizations remove all the unreachable code 2794 so that unreachable code will not keep values live. */ 2795 delete_trivially_dead_insns (insns, max_reg_num (), 0); 2796 2797 /* Try to identify useless null pointer tests and delete them. */ 2798 if (flag_delete_null_pointer_checks || flag_thread_jumps) 2799 { 2800 timevar_push (TV_JUMP); 2801 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2802 2803 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP 2804 | (flag_thread_jumps ? CLEANUP_THREADING : 0)); 2805 2806 if (flag_delete_null_pointer_checks) 2807 delete_null_pointer_checks (insns); 2808 /* CFG is no longer maintained up-to-date. */ 2809 free_bb_for_insn (); 2810 timevar_pop (TV_JUMP); 2811 } 2812 2813 /* The second pass of jump optimization is likely to have 2814 removed a bunch more instructions. */ 2815 renumber_insns (rtl_dump_file); 2816 2817 timevar_pop (TV_CSE); 2818 close_dump_file (DFI_cse, print_rtl, insns); 2819 } 2820 2821 open_dump_file (DFI_addressof, decl); 2822 2823 purge_addressof (insns); 2824 reg_scan (insns, max_reg_num (), 1); 2825 2826 close_dump_file (DFI_addressof, print_rtl, insns); 2827 2828 ggc_collect (); 2829 2830 /* Perform global cse. */ 2831 2832 if (optimize > 0 && flag_gcse) 2833 { 2834 int save_csb, save_cfj; 2835 int tem2 = 0; 2836 2837 timevar_push (TV_GCSE); 2838 open_dump_file (DFI_gcse, decl); 2839 2840 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2841 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP); 2842 tem = gcse_main (insns, rtl_dump_file); 2843 rebuild_jump_labels (insns); 2844 2845 save_csb = flag_cse_skip_blocks; 2846 save_cfj = flag_cse_follow_jumps; 2847 flag_cse_skip_blocks = flag_cse_follow_jumps = 0; 2848 2849 /* CFG is no longer maintained up-to-date. */ 2850 free_bb_for_insn (); 2851 /* If -fexpensive-optimizations, re-run CSE to clean up things done 2852 by gcse. */ 2853 if (flag_expensive_optimizations) 2854 { 2855 timevar_push (TV_CSE); 2856 reg_scan (insns, max_reg_num (), 1); 2857 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file); 2858 timevar_pop (TV_CSE); 2859 cse_not_expected = !flag_rerun_cse_after_loop; 2860 } 2861 2862 /* If gcse or cse altered any jumps, rerun jump optimizations to clean 2863 things up. Then possibly re-run CSE again. */ 2864 while (tem || tem2) 2865 { 2866 tem = tem2 = 0; 2867 timevar_push (TV_JUMP); 2868 rebuild_jump_labels (insns); 2869 delete_trivially_dead_insns (insns, max_reg_num (), 0); 2870 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2871 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP); 2872 /* CFG is no longer maintained up-to-date. */ 2873 free_bb_for_insn (); 2874 timevar_pop (TV_JUMP); 2875 2876 if (flag_expensive_optimizations) 2877 { 2878 timevar_push (TV_CSE); 2879 reg_scan (insns, max_reg_num (), 1); 2880 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file); 2881 timevar_pop (TV_CSE); 2882 } 2883 } 2884 2885 close_dump_file (DFI_gcse, print_rtl, insns); 2886 timevar_pop (TV_GCSE); 2887 2888 ggc_collect (); 2889 flag_cse_skip_blocks = save_csb; 2890 flag_cse_follow_jumps = save_cfj; 2891 } 2892 2893 /* Move constant computations out of loops. */ 2894 2895 if (optimize > 0) 2896 { 2897 timevar_push (TV_LOOP); 2898 open_dump_file (DFI_loop, decl); 2899 free_bb_for_insn (); 2900 2901 if (flag_rerun_loop_opt) 2902 { 2903 cleanup_barriers (); 2904 2905 /* We only want to perform unrolling once. */ 2906 loop_optimize (insns, rtl_dump_file, LOOP_FIRST_PASS); 2907 2908 /* The first call to loop_optimize makes some instructions 2909 trivially dead. We delete those instructions now in the 2910 hope that doing so will make the heuristics in loop work 2911 better and possibly speed up compilation. */ 2912 delete_trivially_dead_insns (insns, max_reg_num (), 0); 2913 2914 /* The regscan pass is currently necessary as the alias 2915 analysis code depends on this information. */ 2916 reg_scan (insns, max_reg_num (), 1); 2917 } 2918 cleanup_barriers (); 2919 loop_optimize (insns, rtl_dump_file, 2920 (flag_unroll_loops ? LOOP_UNROLL : 0) | LOOP_BCT 2921 | (flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0)); 2922 2923 close_dump_file (DFI_loop, print_rtl, insns); 2924 timevar_pop (TV_LOOP); 2925 2926 ggc_collect (); 2927 } 2928 2929 if (optimize > 0) 2930 { 2931 timevar_push (TV_CSE2); 2932 open_dump_file (DFI_cse2, decl); 2933 2934 if (flag_rerun_cse_after_loop) 2935 { 2936 /* Running another jump optimization pass before the second 2937 cse pass sometimes simplifies the RTL enough to allow 2938 the second CSE pass to do a better job. Jump_optimize can change 2939 max_reg_num so we must rerun reg_scan afterwards. 2940 ??? Rework to not call reg_scan so often. */ 2941 timevar_push (TV_JUMP); 2942 2943 /* The previous call to loop_optimize makes some instructions 2944 trivially dead. We delete those instructions now in the 2945 hope that doing so will make the heuristics in jump work 2946 better and possibly speed up compilation. */ 2947 delete_trivially_dead_insns (insns, max_reg_num (), 0); 2948 2949 reg_scan (insns, max_reg_num (), 0); 2950 2951 timevar_push (TV_IFCVT); 2952 2953 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2954 cleanup_cfg (CLEANUP_EXPENSIVE); 2955 if_convert (0); 2956 2957 timevar_pop(TV_IFCVT); 2958 2959 timevar_pop (TV_JUMP); 2960 2961 /* CFG is no longer maintained up-to-date. */ 2962 free_bb_for_insn (); 2963 reg_scan (insns, max_reg_num (), 0); 2964 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file); 2965 2966 if (tem) 2967 { 2968 timevar_push (TV_JUMP); 2969 rebuild_jump_labels (insns); 2970 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2971 cleanup_cfg (CLEANUP_EXPENSIVE); 2972 /* CFG is no longer maintained up-to-date. */ 2973 free_bb_for_insn (); 2974 timevar_pop (TV_JUMP); 2975 } 2976 } 2977 2978 close_dump_file (DFI_cse2, print_rtl, insns); 2979 timevar_pop (TV_CSE2); 2980 2981 ggc_collect (); 2982 } 2983 2984 cse_not_expected = 1; 2985 2986 regclass_init (); 2987 2988 /* Do control and data flow analysis; wrote some of the results to 2989 the dump file. */ 2990 2991 timevar_push (TV_FLOW); 2992 open_dump_file (DFI_cfg, decl); 2993 2994 find_basic_blocks (insns, max_reg_num (), rtl_dump_file); 2995 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) 2996 | (flag_thread_jumps ? CLEANUP_THREADING : 0)); 2997 check_function_return_warnings (); 2998 2999 /* It may make more sense to mark constant functions after dead code is 3000 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs 3001 may insert code making function non-constant, but we still must consider 3002 it as constant, otherwise -fbranch-probabilities will not read data back. 3003 3004 life_analyzis rarely eliminates modification of external memory. 3005 */ 3006 mark_constant_function (); 3007 3008 close_dump_file (DFI_cfg, print_rtl_with_bb, insns); 3009 3010 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities) 3011 { 3012 timevar_push (TV_BRANCH_PROB); 3013 open_dump_file (DFI_bp, decl); 3014 3015 branch_prob (); 3016 3017 close_dump_file (DFI_bp, print_rtl_with_bb, insns); 3018 timevar_pop (TV_BRANCH_PROB); 3019 } 3020 3021 open_dump_file (DFI_life, decl); 3022 if (optimize) 3023 { 3024 struct loops loops; 3025 3026 /* Discover and record the loop depth at the head of each basic 3027 block. The loop infrastructure does the real job for us. */ 3028 flow_loops_find (&loops, LOOP_TREE); 3029 3030 if (rtl_dump_file) 3031 flow_loops_dump (&loops, rtl_dump_file, NULL, 0); 3032 3033 /* Estimate using heuristics if no profiling info is available. */ 3034 if (flag_guess_branch_prob) 3035 estimate_probability (&loops); 3036 3037 flow_loops_free (&loops); 3038 } 3039 life_analysis (insns, rtl_dump_file, PROP_FINAL); 3040 timevar_pop (TV_FLOW); 3041 3042 no_new_pseudos = 1; 3043 3044 if (warn_uninitialized || extra_warnings) 3045 { 3046 uninitialized_vars_warning (DECL_INITIAL (decl)); 3047 if (extra_warnings) 3048 setjmp_args_warning (); 3049 } 3050 3051 if (optimize) 3052 { 3053 if (initialize_uninitialized_subregs ()) 3054 { 3055 /* Insns were inserted, so things might look a bit different. */ 3056 insns = get_insns (); 3057 life_analysis (insns, rtl_dump_file, 3058 (PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES)); 3059 } 3060 } 3061 3062 close_dump_file (DFI_life, print_rtl_with_bb, insns); 3063 3064 ggc_collect (); 3065 3066 /* If -opt, try combining insns through substitution. */ 3067 3068 if (optimize > 0) 3069 { 3070 int rebuild_jump_labels_after_combine = 0; 3071 3072 timevar_push (TV_COMBINE); 3073 open_dump_file (DFI_combine, decl); 3074 3075 rebuild_jump_labels_after_combine 3076 = combine_instructions (insns, max_reg_num ()); 3077 3078 /* Always purge dead edges, as we may eliminate an insn throwing 3079 exception. */ 3080 rebuild_jump_labels_after_combine |= purge_all_dead_edges (true); 3081 3082 /* Combining insns may have turned an indirect jump into a 3083 direct jump. Rebuid the JUMP_LABEL fields of jumping 3084 instructions. */ 3085 if (rebuild_jump_labels_after_combine) 3086 { 3087 timevar_push (TV_JUMP); 3088 rebuild_jump_labels (insns); 3089 timevar_pop (TV_JUMP); 3090 3091 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE); 3092 } 3093 3094 close_dump_file (DFI_combine, print_rtl_with_bb, insns); 3095 timevar_pop (TV_COMBINE); 3096 3097 ggc_collect (); 3098 } 3099 3100 /* Rerun if-conversion, as combine may have simplified things enough to 3101 now meet sequence length restrictions. */ 3102 if (optimize > 0) 3103 { 3104 timevar_push (TV_IFCVT); 3105 open_dump_file (DFI_ce, decl); 3106 3107 no_new_pseudos = 0; 3108 if_convert (1); 3109 no_new_pseudos = 1; 3110 3111 close_dump_file (DFI_ce, print_rtl_with_bb, insns); 3112 timevar_pop (TV_IFCVT); 3113 } 3114 3115 /* Register allocation pre-pass, to reduce number of moves 3116 necessary for two-address machines. */ 3117 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations)) 3118 { 3119 timevar_push (TV_REGMOVE); 3120 open_dump_file (DFI_regmove, decl); 3121 3122 regmove_optimize (insns, max_reg_num (), rtl_dump_file); 3123 3124 close_dump_file (DFI_regmove, print_rtl_with_bb, insns); 3125 timevar_pop (TV_REGMOVE); 3126 3127 ggc_collect (); 3128 } 3129 3130 /* Do unconditional splitting before register allocation to allow machine 3131 description to add extra information not needed previously. */ 3132 split_all_insns (1); 3133 3134 /* Any of the several passes since flow1 will have munged register 3135 lifetime data a bit. */ 3136 register_life_up_to_date = 0; 3137 3138#ifdef OPTIMIZE_MODE_SWITCHING 3139 timevar_push (TV_MODE_SWITCH); 3140 3141 no_new_pseudos = 0; 3142 if (optimize_mode_switching (NULL)) 3143 { 3144 /* We did work, and so had to regenerate global life information. 3145 Take advantage of this and don't re-recompute register life 3146 information below. */ 3147 register_life_up_to_date = 1; 3148 } 3149 no_new_pseudos = 1; 3150 3151 timevar_pop (TV_MODE_SWITCH); 3152#endif 3153 3154 timevar_push (TV_SCHED); 3155 3156#ifdef INSN_SCHEDULING 3157 3158 /* Print function header into sched dump now 3159 because doing the sched analysis makes some of the dump. */ 3160 if (optimize > 0 && flag_schedule_insns) 3161 { 3162 open_dump_file (DFI_sched, decl); 3163 3164 /* Do control and data sched analysis, 3165 and write some of the results to dump file. */ 3166 3167 schedule_insns (rtl_dump_file); 3168 3169 close_dump_file (DFI_sched, print_rtl_with_bb, insns); 3170 3171 /* Register lifetime information was updated as part of verifying 3172 the schedule. */ 3173 register_life_up_to_date = 1; 3174 } 3175#endif 3176 timevar_pop (TV_SCHED); 3177 3178 ggc_collect (); 3179 3180 /* Determine if the current function is a leaf before running reload 3181 since this can impact optimizations done by the prologue and 3182 epilogue thus changing register elimination offsets. */ 3183 current_function_is_leaf = leaf_function_p (); 3184 3185 timevar_push (TV_LOCAL_ALLOC); 3186 open_dump_file (DFI_lreg, decl); 3187 3188 /* Allocate pseudo-regs that are used only within 1 basic block. 3189 3190 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the 3191 jump optimizer after register allocation and reloading are finished. */ 3192 3193 if (! register_life_up_to_date) 3194 recompute_reg_usage (insns, ! optimize_size); 3195 3196 /* Allocate the reg_renumber array. */ 3197 allocate_reg_info (max_regno, FALSE, TRUE); 3198 3199 /* And the reg_equiv_memory_loc array. */ 3200 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx)); 3201 3202 allocate_initial_values (reg_equiv_memory_loc); 3203 3204 regclass (insns, max_reg_num (), rtl_dump_file); 3205 rebuild_label_notes_after_reload = local_alloc (); 3206 3207 timevar_pop (TV_LOCAL_ALLOC); 3208 3209 if (dump_file[DFI_lreg].enabled) 3210 { 3211 timevar_push (TV_DUMP); 3212 3213 dump_flow_info (rtl_dump_file); 3214 dump_local_alloc (rtl_dump_file); 3215 3216 close_dump_file (DFI_lreg, print_rtl_with_bb, insns); 3217 timevar_pop (TV_DUMP); 3218 } 3219 3220 ggc_collect (); 3221 3222 timevar_push (TV_GLOBAL_ALLOC); 3223 open_dump_file (DFI_greg, decl); 3224 3225 /* If optimizing, allocate remaining pseudo-regs. Do the reload 3226 pass fixing up any insns that are invalid. */ 3227 3228 if (optimize) 3229 failure = global_alloc (rtl_dump_file); 3230 else 3231 { 3232 build_insn_chain (insns); 3233 failure = reload (insns, 0); 3234 } 3235 3236 timevar_pop (TV_GLOBAL_ALLOC); 3237 3238 if (dump_file[DFI_greg].enabled) 3239 { 3240 timevar_push (TV_DUMP); 3241 3242 dump_global_regs (rtl_dump_file); 3243 3244 close_dump_file (DFI_greg, print_rtl_with_bb, insns); 3245 timevar_pop (TV_DUMP); 3246 } 3247 3248 if (failure) 3249 goto exit_rest_of_compilation; 3250 3251 ggc_collect (); 3252 3253 open_dump_file (DFI_postreload, decl); 3254 3255 /* Do a very simple CSE pass over just the hard registers. */ 3256 if (optimize > 0) 3257 { 3258 timevar_push (TV_RELOAD_CSE_REGS); 3259 reload_cse_regs (insns); 3260 timevar_pop (TV_RELOAD_CSE_REGS); 3261 } 3262 3263 /* Register allocation and reloading may have turned an indirect jump into 3264 a direct jump. If so, we must rebuild the JUMP_LABEL fields of 3265 jumping instructions. */ 3266 if (rebuild_label_notes_after_reload) 3267 { 3268 timevar_push (TV_JUMP); 3269 3270 rebuild_jump_labels (insns); 3271 3272 timevar_pop (TV_JUMP); 3273 } 3274 3275 close_dump_file (DFI_postreload, print_rtl_with_bb, insns); 3276 3277 /* Re-create the death notes which were deleted during reload. */ 3278 timevar_push (TV_FLOW2); 3279 open_dump_file (DFI_flow2, decl); 3280 3281#ifdef ENABLE_CHECKING 3282 verify_flow_info (); 3283#endif 3284 3285 /* If optimizing, then go ahead and split insns now. */ 3286 if (optimize > 0) 3287 split_all_insns (0); 3288 3289 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0); 3290 3291 /* On some machines, the prologue and epilogue code, or parts thereof, 3292 can be represented as RTL. Doing so lets us schedule insns between 3293 it and the rest of the code and also allows delayed branch 3294 scheduling to operate in the epilogue. */ 3295 thread_prologue_and_epilogue_insns (insns); 3296 3297 /* Cross-jumping is O(N^3) on the number of edges, thus trying to 3298 perform cross-jumping on flow graphs which have a high connectivity 3299 will take a long time. This is similar to the test to disable GCSE. */ 3300 cleanup_crossjump = CLEANUP_CROSSJUMP; 3301 if (n_basic_blocks > 1000 && n_edges / n_basic_blocks >= 20) 3302 { 3303 if (optimize && warn_disabled_optimization) 3304 warning ("crossjump disabled: %d > 1000 basic blocks and %d >= 20 edges/basic block", 3305 n_basic_blocks, n_edges / n_basic_blocks); 3306 cleanup_crossjump = 0; 3307 } 3308 3309 if (optimize) 3310 { 3311 cleanup_cfg (CLEANUP_EXPENSIVE | cleanup_crossjump); 3312 life_analysis (insns, rtl_dump_file, PROP_FINAL); 3313 3314 /* This is kind of a heuristic. We need to run combine_stack_adjustments 3315 even for machines with possibly nonzero RETURN_POPS_ARGS 3316 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having 3317 push instructions will have popping returns. */ 3318#ifndef PUSH_ROUNDING 3319 if (!ACCUMULATE_OUTGOING_ARGS) 3320#endif 3321 combine_stack_adjustments (); 3322 3323 ggc_collect (); 3324 } 3325 3326 flow2_completed = 1; 3327 3328 close_dump_file (DFI_flow2, print_rtl_with_bb, insns); 3329 timevar_pop (TV_FLOW2); 3330 3331#ifdef HAVE_peephole2 3332 if (optimize > 0 && flag_peephole2) 3333 { 3334 timevar_push (TV_PEEPHOLE2); 3335 open_dump_file (DFI_peephole2, decl); 3336 3337 peephole2_optimize (rtl_dump_file); 3338 3339 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns); 3340 timevar_pop (TV_PEEPHOLE2); 3341 } 3342#endif 3343 3344 if (optimize > 0 && (flag_rename_registers || flag_cprop_registers)) 3345 { 3346 timevar_push (TV_RENAME_REGISTERS); 3347 open_dump_file (DFI_rnreg, decl); 3348 3349 if (flag_rename_registers) 3350 regrename_optimize (); 3351 if (flag_cprop_registers) 3352 copyprop_hardreg_forward (); 3353 3354 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns); 3355 timevar_pop (TV_RENAME_REGISTERS); 3356 } 3357 3358 if (optimize > 0) 3359 { 3360 timevar_push (TV_IFCVT2); 3361 open_dump_file (DFI_ce2, decl); 3362 3363 if_convert (1); 3364 3365 close_dump_file (DFI_ce2, print_rtl_with_bb, insns); 3366 timevar_pop (TV_IFCVT2); 3367 } 3368#ifdef STACK_REGS 3369 if (optimize) 3370 split_all_insns (1); 3371#endif 3372 3373#ifdef INSN_SCHEDULING 3374 if (optimize > 0 && flag_schedule_insns_after_reload) 3375 { 3376 timevar_push (TV_SCHED2); 3377 open_dump_file (DFI_sched2, decl); 3378 3379 /* Do control and data sched analysis again, 3380 and write some more of the results to dump file. */ 3381 3382 split_all_insns (1); 3383 3384 schedule_insns (rtl_dump_file); 3385 3386 close_dump_file (DFI_sched2, print_rtl_with_bb, insns); 3387 timevar_pop (TV_SCHED2); 3388 3389 ggc_collect (); 3390 } 3391#endif 3392 3393#ifdef LEAF_REGISTERS 3394 current_function_uses_only_leaf_regs 3395 = optimize > 0 && only_leaf_regs_used () && leaf_function_p (); 3396#endif 3397 3398#ifdef STACK_REGS 3399 timevar_push (TV_REG_STACK); 3400 open_dump_file (DFI_stack, decl); 3401 3402 reg_to_stack (insns, rtl_dump_file); 3403 3404 close_dump_file (DFI_stack, print_rtl_with_bb, insns); 3405 timevar_pop (TV_REG_STACK); 3406 3407 ggc_collect (); 3408#endif 3409 if (optimize > 0) 3410 { 3411 timevar_push (TV_REORDER_BLOCKS); 3412 open_dump_file (DFI_bbro, decl); 3413 3414 /* Last attempt to optimize CFG, as life analysis possibly removed 3415 some instructions. Note that we can't rerun crossjump at this 3416 point, because it can turn a switch into a direct branch, which 3417 can leave the tablejump address calculation in the code, which 3418 can lead to referencing an undefined label. */ 3419 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK); 3420 if (flag_reorder_blocks) 3421 { 3422 reorder_basic_blocks (); 3423 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK); 3424 } 3425 3426 close_dump_file (DFI_bbro, print_rtl_with_bb, insns); 3427 timevar_pop (TV_REORDER_BLOCKS); 3428 } 3429 compute_alignments (); 3430 3431 /* CFG is no longer maintained up-to-date. */ 3432 free_bb_for_insn (); 3433 3434 /* If a machine dependent reorganization is needed, call it. */ 3435#ifdef MACHINE_DEPENDENT_REORG 3436 timevar_push (TV_MACH_DEP); 3437 open_dump_file (DFI_mach, decl); 3438 3439 MACHINE_DEPENDENT_REORG (insns); 3440 3441 close_dump_file (DFI_mach, print_rtl, insns); 3442 timevar_pop (TV_MACH_DEP); 3443 3444 ggc_collect (); 3445#endif 3446 3447 purge_line_number_notes (insns); 3448 cleanup_barriers (); 3449 3450 /* If a scheduling pass for delayed branches is to be done, 3451 call the scheduling code. */ 3452 3453#ifdef DELAY_SLOTS 3454 if (optimize > 0 && flag_delayed_branch) 3455 { 3456 timevar_push (TV_DBR_SCHED); 3457 open_dump_file (DFI_dbr, decl); 3458 3459 dbr_schedule (insns, rtl_dump_file); 3460 3461 close_dump_file (DFI_dbr, print_rtl, insns); 3462 timevar_pop (TV_DBR_SCHED); 3463 3464 ggc_collect (); 3465 } 3466#endif 3467 3468#if defined (HAVE_ATTR_length) && !defined (STACK_REGS) 3469 timevar_push (TV_SHORTEN_BRANCH); 3470 split_all_insns_noflow (); 3471 timevar_pop (TV_SHORTEN_BRANCH); 3472#endif 3473 3474 convert_to_eh_region_ranges (); 3475 3476 /* Shorten branches. */ 3477 timevar_push (TV_SHORTEN_BRANCH); 3478 shorten_branches (get_insns ()); 3479 timevar_pop (TV_SHORTEN_BRANCH); 3480 3481 current_function_nothrow = nothrow_function_p (); 3482 if (current_function_nothrow) 3483 /* Now we know that this can't throw; set the flag for the benefit 3484 of other functions later in this translation unit. */ 3485 TREE_NOTHROW (current_function_decl) = 1; 3486 3487 /* Now turn the rtl into assembler code. */ 3488 3489 timevar_push (TV_FINAL); 3490 { 3491 rtx x; 3492 const char *fnname; 3493 3494 /* Get the function's name, as described by its RTL. This may be 3495 different from the DECL_NAME name used in the source file. */ 3496 3497 x = DECL_RTL (decl); 3498 if (GET_CODE (x) != MEM) 3499 abort (); 3500 x = XEXP (x, 0); 3501 if (GET_CODE (x) != SYMBOL_REF) 3502 abort (); 3503 fnname = XSTR (x, 0); 3504 3505 assemble_start_function (decl, fnname); 3506 final_start_function (insns, asm_out_file, optimize); 3507 final (insns, asm_out_file, optimize, 0); 3508 final_end_function (); 3509 3510#ifdef IA64_UNWIND_INFO 3511 /* ??? The IA-64 ".handlerdata" directive must be issued before 3512 the ".endp" directive that closes the procedure descriptor. */ 3513 output_function_exception_table (); 3514#endif 3515 3516 assemble_end_function (decl, fnname); 3517 3518#ifndef IA64_UNWIND_INFO 3519 /* Otherwise, it feels unclean to switch sections in the middle. */ 3520 output_function_exception_table (); 3521#endif 3522 3523 if (! quiet_flag) 3524 fflush (asm_out_file); 3525 3526 /* Release all memory allocated by flow. */ 3527 free_basic_block_vars (0); 3528 3529 /* Release all memory held by regsets now. */ 3530 regset_release_memory (); 3531 } 3532 timevar_pop (TV_FINAL); 3533 3534 ggc_collect (); 3535 3536 /* Write DBX symbols if requested. */ 3537 3538 /* Note that for those inline functions where we don't initially 3539 know for certain that we will be generating an out-of-line copy, 3540 the first invocation of this routine (rest_of_compilation) will 3541 skip over this code by doing a `goto exit_rest_of_compilation;'. 3542 Later on, finish_compilation will call rest_of_compilation again 3543 for those inline functions that need to have out-of-line copies 3544 generated. During that call, we *will* be routed past here. */ 3545 3546 timevar_push (TV_SYMOUT); 3547 (*debug_hooks->function_decl) (decl); 3548 timevar_pop (TV_SYMOUT); 3549 3550 exit_rest_of_compilation: 3551 3552 /* In case the function was not output, 3553 don't leave any temporary anonymous types 3554 queued up for sdb output. */ 3555#ifdef SDB_DEBUGGING_INFO 3556 if (write_symbols == SDB_DEBUG) 3557 sdbout_types (NULL_TREE); 3558#endif 3559 3560 reload_completed = 0; 3561 flow2_completed = 0; 3562 no_new_pseudos = 0; 3563 3564 timevar_push (TV_FINAL); 3565 3566 /* Clear out the insn_length contents now that they are no 3567 longer valid. */ 3568 init_insn_lengths (); 3569 3570 /* Clear out the real_constant_chain before some of the rtx's 3571 it runs through become garbage. */ 3572 clear_const_double_mem (); 3573 3574 /* Show no temporary slots allocated. */ 3575 init_temp_slots (); 3576 3577 free_basic_block_vars (0); 3578 free_bb_for_insn (); 3579 3580 timevar_pop (TV_FINAL); 3581 3582 /* Make sure volatile mem refs aren't considered valid operands for 3583 arithmetic insns. We must call this here if this is a nested inline 3584 function, since the above code leaves us in the init_recog state 3585 (from final.c), and the function context push/pop code does not 3586 save/restore volatile_ok. 3587 3588 ??? Maybe it isn't necessary for expand_start_function to call this 3589 anymore if we do it here? */ 3590 3591 init_recog_no_volatile (); 3592 3593 /* We're done with this function. Free up memory if we can. */ 3594 free_after_parsing (cfun); 3595 if (! DECL_DEFER_OUTPUT (decl)) 3596 { 3597 free_after_compilation (cfun); 3598 3599 /* Clear integrate.c's pointer to the cfun structure we just 3600 destroyed. */ 3601 DECL_SAVED_INSNS (decl) = 0; 3602 } 3603 cfun = 0; 3604 3605 ggc_collect (); 3606 3607 timevar_pop (TV_REST_OF_COMPILATION); 3608} 3609 3610static void 3611display_help () 3612{ 3613 int undoc; 3614 unsigned long i; 3615 const char *lang; 3616 3617 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n")); 3618 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n")); 3619 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n")); 3620 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n")); 3621 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n")); 3622 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")); 3623 3624 for (i = ARRAY_SIZE (f_options); i--;) 3625 { 3626 const char *description = f_options[i].description; 3627 3628 if (description != NULL && * description != 0) 3629 printf (" -f%-21s %s\n", 3630 f_options[i].string, _(description)); 3631 } 3632 3633 printf (_(" -O[number] Set optimization level to [number]\n")); 3634 printf (_(" -Os Optimize for space rather than speed\n")); 3635 for (i = LAST_PARAM; i--;) 3636 { 3637 const char *description = compiler_params[i].help; 3638 const int length = 21-strlen(compiler_params[i].option); 3639 3640 if (description != NULL && * description != 0) 3641 printf (" --param %s=<value>%.*s%s\n", 3642 compiler_params[i].option, 3643 length > 0 ? length : 1, " ", 3644 _(description)); 3645 } 3646 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n")); 3647 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n")); 3648 printf (_(" -w Suppress warnings\n")); 3649 printf (_(" -W Enable extra warnings\n")); 3650 3651 for (i = ARRAY_SIZE (W_options); i--;) 3652 { 3653 const char *description = W_options[i].description; 3654 3655 if (description != NULL && * description != 0) 3656 printf (" -W%-21s %s\n", 3657 W_options[i].string, _(description)); 3658 } 3659 3660 printf (_(" -Wunused Enable unused warnings\n")); 3661 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n")); 3662 printf (_(" -p Enable function profiling\n")); 3663 printf (_(" -o <file> Place output into <file> \n")); 3664 printf (_("\ 3665 -G <number> Put global and static data smaller than <number>\n\ 3666 bytes into a special section (on some targets)\n")); 3667 3668 for (i = ARRAY_SIZE (debug_args); i--;) 3669 { 3670 if (debug_args[i].description != NULL) 3671 printf (" -g%-21s %s\n", 3672 debug_args[i].arg, _(debug_args[i].description)); 3673 } 3674 3675 printf (_(" -aux-info <file> Emit declaration info into <file>\n")); 3676 printf (_(" -quiet Do not display functions compiled or elapsed time\n")); 3677 printf (_(" -version Display the compiler's version\n")); 3678 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n")); 3679 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n")); 3680#if defined INSN_SCHEDULING 3681 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n")); 3682#endif 3683 printf (_(" --help Display this information\n")); 3684 3685 undoc = 0; 3686 lang = "language"; 3687 3688 /* Display descriptions of language specific options. 3689 If there is no description, note that there is an undocumented option. 3690 If the description is empty, do not display anything. (This allows 3691 options to be deliberately undocumented, for whatever reason). 3692 If the option string is missing, then this is a marker, indicating 3693 that the description string is in fact the name of a language, whose 3694 language specific options are to follow. */ 3695 3696 if (ARRAY_SIZE (documented_lang_options) > 1) 3697 { 3698 printf (_("\nLanguage specific options:\n")); 3699 3700 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++) 3701 { 3702 const char *description = documented_lang_options[i].description; 3703 const char *option = documented_lang_options[i].option; 3704 3705 if (description == NULL) 3706 { 3707 undoc = 1; 3708 3709 if (extra_warnings) 3710 printf (_(" %-23.23s [undocumented]\n"), option); 3711 } 3712 else if (*description == 0) 3713 continue; 3714 else if (option == NULL) 3715 { 3716 if (undoc) 3717 printf 3718 (_("\nThere are undocumented %s specific options as well.\n"), 3719 lang); 3720 undoc = 0; 3721 3722 printf (_("\n Options for %s:\n"), description); 3723 3724 lang = description; 3725 } 3726 else 3727 printf (" %-23.23s %s\n", option, _(description)); 3728 } 3729 } 3730 3731 if (undoc) 3732 printf (_("\nThere are undocumented %s specific options as well.\n"), 3733 lang); 3734 3735 display_target_options (); 3736} 3737 3738static void 3739display_target_options () 3740{ 3741 int undoc, i; 3742 static bool displayed = false; 3743 3744 /* Avoid double printing for --help --target-help. */ 3745 if (displayed) 3746 return; 3747 displayed = true; 3748 3749 if (ARRAY_SIZE (target_switches) > 1 3750#ifdef TARGET_OPTIONS 3751 || ARRAY_SIZE (target_options) > 1 3752#endif 3753 ) 3754 { 3755 int doc = 0; 3756 3757 undoc = 0; 3758 3759 printf (_("\nTarget specific options:\n")); 3760 3761 for (i = ARRAY_SIZE (target_switches); i--;) 3762 { 3763 const char *option = target_switches[i].name; 3764 const char *description = target_switches[i].description; 3765 3766 if (option == NULL || *option == 0) 3767 continue; 3768 else if (description == NULL) 3769 { 3770 undoc = 1; 3771 3772 if (extra_warnings) 3773 printf (_(" -m%-23.23s [undocumented]\n"), option); 3774 } 3775 else if (* description != 0) 3776 doc += printf (" -m%-23.23s %s\n", option, _(description)); 3777 } 3778 3779#ifdef TARGET_OPTIONS 3780 for (i = ARRAY_SIZE (target_options); i--;) 3781 { 3782 const char *option = target_options[i].prefix; 3783 const char *description = target_options[i].description; 3784 3785 if (option == NULL || *option == 0) 3786 continue; 3787 else if (description == NULL) 3788 { 3789 undoc = 1; 3790 3791 if (extra_warnings) 3792 printf (_(" -m%-23.23s [undocumented]\n"), option); 3793 } 3794 else if (* description != 0) 3795 doc += printf (" -m%-23.23s %s\n", option, _(description)); 3796 } 3797#endif 3798 if (undoc) 3799 { 3800 if (doc) 3801 printf (_("\nThere are undocumented target specific options as well.\n")); 3802 else 3803 printf (_(" They exist, but they are not documented.\n")); 3804 } 3805 } 3806} 3807 3808/* Parse a -d... command line switch. */ 3809 3810static void 3811decode_d_option (arg) 3812 const char *arg; 3813{ 3814 int i, c, matched; 3815 3816 while (*arg) 3817 switch (c = *arg++) 3818 { 3819 case 'a': 3820 for (i = 0; i < (int) DFI_MAX; ++i) 3821 dump_file[i].enabled = 1; 3822 break; 3823 case 'A': 3824 flag_debug_asm = 1; 3825 break; 3826 case 'p': 3827 flag_print_asm_name = 1; 3828 break; 3829 case 'P': 3830 flag_dump_rtl_in_asm = 1; 3831 flag_print_asm_name = 1; 3832 break; 3833 case 'v': 3834 graph_dump_format = vcg; 3835 break; 3836 case 'x': 3837 rtl_dump_and_exit = 1; 3838 break; 3839 case 'y': 3840 (*lang_hooks.set_yydebug) (1); 3841 break; 3842 case 'D': /* These are handled by the preprocessor. */ 3843 case 'I': 3844 break; 3845 3846 default: 3847 matched = 0; 3848 for (i = 0; i < (int) DFI_MAX; ++i) 3849 if (c == dump_file[i].debug_switch) 3850 { 3851 dump_file[i].enabled = 1; 3852 matched = 1; 3853 } 3854 3855 if (! matched) 3856 warning ("unrecognized gcc debugging option: %c", c); 3857 break; 3858 } 3859} 3860 3861/* Parse a -f... command line switch. ARG is the value after the -f. 3862 It is safe to access 'ARG - 2' to generate the full switch name. 3863 Return the number of strings consumed. */ 3864 3865static int 3866decode_f_option (arg) 3867 const char *arg; 3868{ 3869 int j; 3870 const char *option_value = NULL; 3871 3872 /* Search for the option in the table of binary f options. */ 3873 for (j = ARRAY_SIZE (f_options); j--;) 3874 { 3875 if (!strcmp (arg, f_options[j].string)) 3876 { 3877 *f_options[j].variable = f_options[j].on_value; 3878 return 1; 3879 } 3880 3881 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-' 3882 && ! strcmp (arg + 3, f_options[j].string)) 3883 { 3884 *f_options[j].variable = ! f_options[j].on_value; 3885 return 1; 3886 } 3887 } 3888 3889 if (!strcmp (arg, "fast-math")) 3890 set_fast_math_flags (); 3891 else if (!strcmp (arg, "no-fast-math")) 3892 set_no_fast_math_flags (); 3893 else if ((option_value = skip_leading_substring (arg, "inline-limit-")) 3894 || (option_value = skip_leading_substring (arg, "inline-limit="))) 3895 { 3896 int val = 3897 read_integral_parameter (option_value, arg - 2, 3898 MAX_INLINE_INSNS); 3899 set_param_value ("max-inline-insns", val); 3900 } 3901#ifdef INSN_SCHEDULING 3902 else if ((option_value = skip_leading_substring (arg, "sched-verbose="))) 3903 fix_sched_param ("verbose", option_value); 3904#endif 3905 else if ((option_value = skip_leading_substring (arg, "fixed-"))) 3906 fix_register (option_value, 1, 1); 3907 else if ((option_value = skip_leading_substring (arg, "call-used-"))) 3908 fix_register (option_value, 0, 1); 3909 else if ((option_value = skip_leading_substring (arg, "call-saved-"))) 3910 fix_register (option_value, 0, 0); 3911 else if ((option_value = skip_leading_substring (arg, "align-loops="))) 3912 align_loops = read_integral_parameter (option_value, arg - 2, align_loops); 3913 else if ((option_value = skip_leading_substring (arg, "align-functions="))) 3914 align_functions 3915 = read_integral_parameter (option_value, arg - 2, align_functions); 3916 else if ((option_value = skip_leading_substring (arg, "align-jumps="))) 3917 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps); 3918 else if ((option_value = skip_leading_substring (arg, "align-labels="))) 3919 align_labels 3920 = read_integral_parameter (option_value, arg - 2, align_labels); 3921 else if ((option_value 3922 = skip_leading_substring (arg, "stack-limit-register="))) 3923 { 3924 int reg = decode_reg_name (option_value); 3925 if (reg < 0) 3926 error ("unrecognized register name `%s'", option_value); 3927 else 3928 stack_limit_rtx = gen_rtx_REG (Pmode, reg); 3929 } 3930 else if ((option_value 3931 = skip_leading_substring (arg, "stack-limit-symbol="))) 3932 { 3933 const char *nm; 3934 nm = ggc_strdup (option_value); 3935 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm); 3936 } 3937 else if ((option_value 3938 = skip_leading_substring (arg, "message-length="))) 3939 output_set_maximum_length 3940 (&global_dc->buffer, read_integral_parameter 3941 (option_value, arg - 2, diagnostic_line_cutoff (global_dc))); 3942 else if ((option_value 3943 = skip_leading_substring (arg, "diagnostics-show-location="))) 3944 { 3945 if (!strcmp (option_value, "once")) 3946 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE; 3947 else if (!strcmp (option_value, "every-line")) 3948 diagnostic_prefixing_rule (global_dc) 3949 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE; 3950 else 3951 error ("unrecognized option `%s'", arg - 2); 3952 } 3953 else if (!strcmp (arg, "no-stack-limit")) 3954 stack_limit_rtx = NULL_RTX; 3955 else if (!strcmp (arg, "preprocessed")) 3956 /* Recognise this switch but do nothing. This prevents warnings 3957 about an unrecognized switch if cpplib has not been linked in. */ 3958 ; 3959 else 3960 return 0; 3961 3962 return 1; 3963} 3964 3965/* Parse a -W... command line switch. ARG is the value after the -W. 3966 It is safe to access 'ARG - 2' to generate the full switch name. 3967 Return the number of strings consumed. */ 3968 3969static int 3970decode_W_option (arg) 3971 const char *arg; 3972{ 3973 const char *option_value = NULL; 3974 int j; 3975 3976 /* Search for the option in the table of binary W options. */ 3977 3978 for (j = ARRAY_SIZE (W_options); j--;) 3979 { 3980 if (!strcmp (arg, W_options[j].string)) 3981 { 3982 *W_options[j].variable = W_options[j].on_value; 3983 return 1; 3984 } 3985 3986 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-' 3987 && ! strcmp (arg + 3, W_options[j].string)) 3988 { 3989 *W_options[j].variable = ! W_options[j].on_value; 3990 return 1; 3991 } 3992 } 3993 3994 if ((option_value = skip_leading_substring (arg, "id-clash-"))) 3995 warning ("-Wid-clash-LEN is no longer supported"); 3996 else if ((option_value = skip_leading_substring (arg, "larger-than-"))) 3997 { 3998 larger_than_size = read_integral_parameter (option_value, arg - 2, -1); 3999 4000 warn_larger_than = larger_than_size != -1; 4001 } 4002 else if (!strcmp (arg, "unused")) 4003 { 4004 set_Wunused (1); 4005 } 4006 else if (!strcmp (arg, "no-unused")) 4007 { 4008 set_Wunused (0); 4009 } 4010 else 4011 return 0; 4012 4013 return 1; 4014} 4015 4016/* Parse a -g... command line switch. ARG is the value after the -g. 4017 It is safe to access 'ARG - 2' to generate the full switch name. 4018 Return the number of strings consumed. */ 4019 4020static int 4021decode_g_option (arg) 4022 const char *arg; 4023{ 4024 static unsigned level=0; 4025 /* A lot of code assumes write_symbols == NO_DEBUG if the 4026 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track 4027 of what debugging type has been selected). This records the 4028 selected type. It is an error to specify more than one 4029 debugging type. */ 4030 static enum debug_info_type selected_debug_type = NO_DEBUG; 4031 /* Non-zero if debugging format has been explicitly set. 4032 -g and -ggdb don't explicitly set the debugging format so 4033 -gdwarf -g3 is equivalent to -gdwarf3. */ 4034 static int type_explicitly_set_p = 0; 4035 /* Indexed by enum debug_info_type. */ 4036 static const char *const debug_type_names[] = 4037 { 4038 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms" 4039 }; 4040 4041 /* The maximum admissible debug level value. */ 4042 static const unsigned max_debug_level = 3; 4043 4044 /* Look up ARG in the table. */ 4045 for (da = debug_args; da->arg; da++) 4046 { 4047 const int da_len = strlen (da->arg); 4048 4049 if (da_len == 0 || ! strncmp (arg, da->arg, da_len)) 4050 { 4051 enum debug_info_type type = da->debug_type; 4052 const char *p = arg + da_len; 4053 4054 if (*p && ! ISDIGIT (*p)) 4055 continue; 4056 4057 /* A debug flag without a level defaults to level 2. 4058 Note we do not want to call read_integral_parameter 4059 for that case since it will call atoi which 4060 will return zero. 4061 4062 ??? We may want to generalize the interface to 4063 read_integral_parameter to better handle this case 4064 if this case shows up often. */ 4065 if (*p) 4066 level = read_integral_parameter (p, 0, max_debug_level + 1); 4067 else 4068 level = (level == 0) ? 2 : level; 4069 4070 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len)) 4071 { 4072 error ("use -gdwarf -g%d for DWARF v1, level %d", 4073 level, level); 4074 if (level == 2) 4075 error ("use -gdwarf-2 for DWARF v2"); 4076 } 4077 4078 if (level > max_debug_level) 4079 { 4080 warning ("\ 4081ignoring option `%s' due to invalid debug level specification", 4082 arg - 2); 4083 level = debug_info_level; 4084 } 4085 4086 if (type == NO_DEBUG) 4087 { 4088 type = PREFERRED_DEBUGGING_TYPE; 4089 4090 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0) 4091 { 4092#ifdef DWARF2_DEBUGGING_INFO 4093 type = DWARF2_DEBUG; 4094#else 4095#ifdef DBX_DEBUGGING_INFO 4096 type = DBX_DEBUG; 4097#endif 4098#endif 4099 } 4100 } 4101 4102 if (type == NO_DEBUG) 4103 warning ("`%s': unknown or unsupported -g option", arg - 2); 4104 4105 /* Does it conflict with an already selected type? */ 4106 if (type_explicitly_set_p 4107 /* -g/-ggdb don't conflict with anything. */ 4108 && da->debug_type != NO_DEBUG 4109 && type != selected_debug_type) 4110 warning ("`%s' ignored, conflicts with `-g%s'", 4111 arg - 2, debug_type_names[(int) selected_debug_type]); 4112 else 4113 { 4114 /* If the format has already been set, -g/-ggdb 4115 only change the debug level. */ 4116 if (type_explicitly_set_p && da->debug_type == NO_DEBUG) 4117 /* Don't change debugging type. */ 4118 ; 4119 else 4120 { 4121 selected_debug_type = type; 4122 type_explicitly_set_p = da->debug_type != NO_DEBUG; 4123 } 4124 4125 write_symbols = (level == 0 4126 ? NO_DEBUG 4127 : selected_debug_type); 4128 use_gnu_debug_info_extensions = da->use_extensions_p; 4129 debug_info_level = (enum debug_info_level) level; 4130 } 4131 4132 break; 4133 } 4134 } 4135 4136 if (! da->arg) 4137 return 0; 4138 4139 return 1; 4140} 4141 4142/* Decode the first argument in the argv as a language-independent option. 4143 Return the number of strings consumed. */ 4144 4145static unsigned int 4146independent_decode_option (argc, argv) 4147 int argc; 4148 char **argv; 4149{ 4150 char *arg = argv[0]; 4151 4152 if (arg[0] != '-' || arg[1] == 0) 4153 { 4154 if (arg[0] == '+') 4155 return 0; 4156 4157 filename = arg; 4158 4159 return 1; 4160 } 4161 4162 arg++; 4163 4164 if (!strcmp (arg, "-help")) 4165 { 4166 display_help (); 4167 exit_after_options = 1; 4168 } 4169 4170 if (!strcmp (arg, "-target-help")) 4171 { 4172 display_target_options (); 4173 exit_after_options = 1; 4174 } 4175 4176 if (!strcmp (arg, "-version")) 4177 { 4178 print_version (stderr, ""); 4179 exit_after_options = 1; 4180 } 4181 4182 /* Handle '--param <name>=<value>'. */ 4183 if (strcmp (arg, "-param") == 0) 4184 { 4185 char *equal; 4186 4187 if (argc == 1) 4188 { 4189 error ("-param option missing argument"); 4190 return 1; 4191 } 4192 4193 /* Get the '<name>=<value>' parameter. */ 4194 arg = argv[1]; 4195 /* Look for the `='. */ 4196 equal = strchr (arg, '='); 4197 if (!equal) 4198 error ("invalid --param option: %s", arg); 4199 else 4200 { 4201 int val; 4202 4203 /* Zero out the `=' sign so that we get two separate strings. */ 4204 *equal = '\0'; 4205 /* Figure out what value is specified. */ 4206 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL); 4207 if (val != INVALID_PARAM_VAL) 4208 set_param_value (arg, val); 4209 else 4210 error ("invalid parameter value `%s'", equal + 1); 4211 } 4212 4213 return 2; 4214 } 4215 4216 if (*arg == 'Y') 4217 arg++; 4218 4219 switch (*arg) 4220 { 4221 default: 4222 return 0; 4223 4224 case 'O': 4225 /* Already been treated in main (). Do nothing. */ 4226 break; 4227 4228 case 'm': 4229 set_target_switch (arg + 1); 4230 break; 4231 4232 case 'f': 4233 return decode_f_option (arg + 1); 4234 4235 case 'g': 4236 return decode_g_option (arg + 1); 4237 4238 case 'd': 4239 if (!strcmp (arg, "dumpbase")) 4240 { 4241 if (argc == 1) 4242 return 0; 4243 4244 dump_base_name = argv[1]; 4245 return 2; 4246 } 4247 else 4248 decode_d_option (arg + 1); 4249 break; 4250 4251 case 'p': 4252 if (!strcmp (arg, "pedantic")) 4253 pedantic = 1; 4254 else if (!strcmp (arg, "pedantic-errors")) 4255 flag_pedantic_errors = pedantic = 1; 4256 else if (arg[1] == 0) 4257 profile_flag = 1; 4258 else 4259 return 0; 4260 break; 4261 4262 case 'q': 4263 if (!strcmp (arg, "quiet")) 4264 quiet_flag = 1; 4265 else 4266 return 0; 4267 break; 4268 4269 case 'v': 4270 if (!strcmp (arg, "version")) 4271 version_flag = 1; 4272 else 4273 return 0; 4274 break; 4275 4276 case 'w': 4277 if (arg[1] == 0) 4278 inhibit_warnings = 1; 4279 else 4280 return 0; 4281 break; 4282 4283 case 'W': 4284 if (arg[1] == 0) 4285 { 4286 extra_warnings = 1; 4287 /* We save the value of warn_uninitialized, since if they put 4288 -Wuninitialized on the command line, we need to generate a 4289 warning about not using it without also specifying -O. */ 4290 if (warn_uninitialized != 1) 4291 warn_uninitialized = 2; 4292 } 4293 else 4294 return decode_W_option (arg + 1); 4295 break; 4296 4297 case 'a': 4298 if (!strncmp (arg, "aux-info", 8)) 4299 { 4300 if (arg[8] == '\0') 4301 { 4302 if (argc == 1) 4303 return 0; 4304 4305 aux_info_file_name = argv[1]; 4306 flag_gen_aux_info = 1; 4307 return 2; 4308 } 4309 else if (arg[8] == '=') 4310 { 4311 aux_info_file_name = arg + 9; 4312 flag_gen_aux_info = 1; 4313 } 4314 else 4315 return 0; 4316 } 4317 else 4318 return 0; 4319 break; 4320 4321 case 'o': 4322 if (arg[1] == 0) 4323 { 4324 if (argc == 1) 4325 return 0; 4326 4327 asm_file_name = argv[1]; 4328 return 2; 4329 } 4330 return 0; 4331 4332 case 'G': 4333 { 4334 int g_switch_val; 4335 int return_val; 4336 4337 if (arg[1] == 0) 4338 { 4339 if (argc == 1) 4340 return 0; 4341 4342 g_switch_val = read_integral_parameter (argv[1], 0, -1); 4343 return_val = 2; 4344 } 4345 else 4346 { 4347 g_switch_val = read_integral_parameter (arg + 1, 0, -1); 4348 return_val = 1; 4349 } 4350 4351 if (g_switch_val == -1) 4352 return_val = 0; 4353 else 4354 { 4355 g_switch_set = TRUE; 4356 g_switch_value = g_switch_val; 4357 } 4358 4359 return return_val; 4360 } 4361 } 4362 4363 return 1; 4364} 4365 4366/* Decode -m switches. */ 4367/* Decode the switch -mNAME. */ 4368 4369static void 4370set_target_switch (name) 4371 const char *name; 4372{ 4373 size_t j; 4374 int valid_target_option = 0; 4375 4376 for (j = 0; j < ARRAY_SIZE (target_switches); j++) 4377 if (!strcmp (target_switches[j].name, name)) 4378 { 4379 if (target_switches[j].value < 0) 4380 target_flags &= ~-target_switches[j].value; 4381 else 4382 target_flags |= target_switches[j].value; 4383 valid_target_option = 1; 4384 } 4385 4386#ifdef TARGET_OPTIONS 4387 if (!valid_target_option) 4388 for (j = 0; j < ARRAY_SIZE (target_options); j++) 4389 { 4390 int len = strlen (target_options[j].prefix); 4391 if (!strncmp (target_options[j].prefix, name, len)) 4392 { 4393 *target_options[j].variable = name + len; 4394 valid_target_option = 1; 4395 } 4396 } 4397#endif 4398 4399 if (!valid_target_option) 4400 error ("invalid option `%s'", name); 4401} 4402 4403/* Print version information to FILE. 4404 Each line begins with INDENT (for the case where FILE is the 4405 assembler output file). */ 4406 4407static void 4408print_version (file, indent) 4409 FILE *file; 4410 const char *indent; 4411{ 4412#ifndef __VERSION__ 4413#define __VERSION__ "[?]" 4414#endif 4415 fnotice (file, 4416#ifdef __GNUC__ 4417 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n" 4418#else 4419 "%s%s%s version %s (%s) compiled by CC.\n" 4420#endif 4421 , indent, *indent != 0 ? " " : "", 4422 lang_hooks.name, version_string, TARGET_NAME, 4423 indent, __VERSION__); 4424} 4425 4426/* Print an option value and return the adjusted position in the line. 4427 ??? We don't handle error returns from fprintf (disk full); presumably 4428 other code will catch a disk full though. */ 4429 4430static int 4431print_single_switch (file, pos, max, indent, sep, term, type, name) 4432 FILE *file; 4433 int pos, max; 4434 const char *indent, *sep, *term, *type, *name; 4435{ 4436 /* The ultrix fprintf returns 0 on success, so compute the result we want 4437 here since we need it for the following test. */ 4438 int len = strlen (sep) + strlen (type) + strlen (name); 4439 4440 if (pos != 0 4441 && pos + len > max) 4442 { 4443 fprintf (file, "%s", term); 4444 pos = 0; 4445 } 4446 if (pos == 0) 4447 { 4448 fprintf (file, "%s", indent); 4449 pos = strlen (indent); 4450 } 4451 fprintf (file, "%s%s%s", sep, type, name); 4452 pos += len; 4453 return pos; 4454} 4455 4456/* Print active target switches to FILE. 4457 POS is the current cursor position and MAX is the size of a "line". 4458 Each line begins with INDENT and ends with TERM. 4459 Each switch is separated from the next by SEP. */ 4460 4461static void 4462print_switch_values (file, pos, max, indent, sep, term) 4463 FILE *file; 4464 int pos, max; 4465 const char *indent, *sep, *term; 4466{ 4467 size_t j; 4468 char **p; 4469 4470 /* Print the options as passed. */ 4471 4472 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term, 4473 _("options passed: "), ""); 4474 4475 for (p = &save_argv[1]; *p != NULL; p++) 4476 if (**p == '-') 4477 { 4478 /* Ignore these. */ 4479 if (strcmp (*p, "-o") == 0) 4480 { 4481 if (p[1] != NULL) 4482 p++; 4483 continue; 4484 } 4485 if (strcmp (*p, "-quiet") == 0) 4486 continue; 4487 if (strcmp (*p, "-version") == 0) 4488 continue; 4489 if ((*p)[1] == 'd') 4490 continue; 4491 4492 pos = print_single_switch (file, pos, max, indent, sep, term, *p, ""); 4493 } 4494 if (pos > 0) 4495 fprintf (file, "%s", term); 4496 4497 /* Print the -f and -m options that have been enabled. 4498 We don't handle language specific options but printing argv 4499 should suffice. */ 4500 4501 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term, 4502 _("options enabled: "), ""); 4503 4504 for (j = 0; j < ARRAY_SIZE (f_options); j++) 4505 if (*f_options[j].variable == f_options[j].on_value) 4506 pos = print_single_switch (file, pos, max, indent, sep, term, 4507 "-f", f_options[j].string); 4508 4509 /* Print target specific options. */ 4510 4511 for (j = 0; j < ARRAY_SIZE (target_switches); j++) 4512 if (target_switches[j].name[0] != '\0' 4513 && target_switches[j].value > 0 4514 && ((target_switches[j].value & target_flags) 4515 == target_switches[j].value)) 4516 { 4517 pos = print_single_switch (file, pos, max, indent, sep, term, 4518 "-m", target_switches[j].name); 4519 } 4520 4521#ifdef TARGET_OPTIONS 4522 for (j = 0; j < ARRAY_SIZE (target_options); j++) 4523 if (*target_options[j].variable != NULL) 4524 { 4525 char prefix[256]; 4526 sprintf (prefix, "-m%s", target_options[j].prefix); 4527 pos = print_single_switch (file, pos, max, indent, sep, term, 4528 prefix, *target_options[j].variable); 4529 } 4530#endif 4531 4532 fprintf (file, "%s", term); 4533} 4534 4535/* Open assembly code output file. Do this even if -fsyntax-only is 4536 on, because then the driver will have provided the name of a 4537 temporary file or bit bucket for us. NAME is the file specified on 4538 the command line, possibly NULL. */ 4539static void 4540init_asm_output (name) 4541 const char *name; 4542{ 4543 if (name == NULL && asm_file_name == 0) 4544 asm_out_file = stdout; 4545 else 4546 { 4547 if (asm_file_name == 0) 4548 { 4549 int len = strlen (dump_base_name); 4550 char *dumpname = (char *) xmalloc (len + 6); 4551 memcpy (dumpname, dump_base_name, len + 1); 4552 strip_off_ending (dumpname, len); 4553 strcat (dumpname, ".s"); 4554 asm_file_name = dumpname; 4555 } 4556 if (!strcmp (asm_file_name, "-")) 4557 asm_out_file = stdout; 4558 else 4559 asm_out_file = fopen (asm_file_name, "w"); 4560 if (asm_out_file == 0) 4561 fatal_io_error ("can't open %s for writing", asm_file_name); 4562 } 4563 4564#ifdef IO_BUFFER_SIZE 4565 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE), 4566 _IOFBF, IO_BUFFER_SIZE); 4567#endif 4568 4569 if (!flag_syntax_only) 4570 { 4571#ifdef ASM_FILE_START 4572 ASM_FILE_START (asm_out_file); 4573#endif 4574 4575#ifdef ASM_COMMENT_START 4576 if (flag_verbose_asm) 4577 { 4578 /* Print the list of options in effect. */ 4579 print_version (asm_out_file, ASM_COMMENT_START); 4580 print_switch_values (asm_out_file, 0, MAX_LINE, 4581 ASM_COMMENT_START, " ", "\n"); 4582 /* Add a blank line here so it appears in assembler output but not 4583 screen output. */ 4584 fprintf (asm_out_file, "\n"); 4585 } 4586#endif 4587 } 4588} 4589 4590/* Initialization of the front end environment, before command line 4591 options are parsed. Signal handlers, internationalization etc. 4592 ARGV0 is main's argv[0]. */ 4593static void 4594general_init (argv0) 4595 char *argv0; 4596{ 4597 char *p; 4598 4599 p = argv0 + strlen (argv0); 4600 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1])) 4601 --p; 4602 progname = p; 4603 4604 xmalloc_set_program_name (progname); 4605 4606 gcc_init_libintl (); 4607 4608 /* Install handler for SIGFPE, which may be received while we do 4609 compile-time floating point arithmetic. */ 4610 signal (SIGFPE, float_signal); 4611 4612 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */ 4613#ifdef SIGSEGV 4614 signal (SIGSEGV, crash_signal); 4615#endif 4616#ifdef SIGILL 4617 signal (SIGILL, crash_signal); 4618#endif 4619#ifdef SIGBUS 4620 signal (SIGBUS, crash_signal); 4621#endif 4622#ifdef SIGABRT 4623 signal (SIGABRT, crash_signal); 4624#endif 4625#if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT) 4626 signal (SIGIOT, crash_signal); 4627#endif 4628 4629 /* Initialize the diagnostics reporting machinery, so option parsing 4630 can give warnings and errors. */ 4631 diagnostic_initialize (global_dc); 4632} 4633 4634/* Parse command line options and set default flag values, called 4635 after language-independent option-independent initialization. Do 4636 minimal options processing. Outputting diagnostics is OK, but GC 4637 and identifier hashtables etc. are not initialized yet. */ 4638static void 4639parse_options_and_default_flags (argc, argv) 4640 int argc; 4641 char **argv; 4642{ 4643 int i; 4644 4645 /* Save in case md file wants to emit args as a comment. */ 4646 save_argc = argc; 4647 save_argv = argv; 4648 4649 /* Initialize register usage now so switches may override. */ 4650 init_reg_sets (); 4651 4652 /* Register the language-independent parameters. */ 4653 add_params (lang_independent_params, LAST_PARAM); 4654 4655 /* Perform language-specific options initialization. */ 4656 (*lang_hooks.init_options) (); 4657 4658 /* Scan to see what optimization level has been specified. That will 4659 determine the default value of many flags. */ 4660 for (i = 1; i < argc; i++) 4661 { 4662 if (!strcmp (argv[i], "-O")) 4663 { 4664 optimize = 1; 4665 optimize_size = 0; 4666 } 4667 else if (argv[i][0] == '-' && argv[i][1] == 'O') 4668 { 4669 /* Handle -Os, -O2, -O3, -O69, ... */ 4670 char *p = &argv[i][2]; 4671 4672 if ((p[0] == 's') && (p[1] == 0)) 4673 { 4674 optimize_size = 1; 4675 4676 /* Optimizing for size forces optimize to be 2. */ 4677 optimize = 2; 4678 } 4679 else 4680 { 4681 const int optimize_val = read_integral_parameter (p, p - 2, -1); 4682 if (optimize_val != -1) 4683 { 4684 optimize = optimize_val; 4685 4686#ifdef FORCE_OPTIMIZATION_DOWNGRADE 4687#warning FORCE_OPTIMIZATION_DOWNGRADE 4688 if (optimize > FORCE_OPTIMIZATION_DOWNGRADE) 4689 { 4690 optimize = FORCE_OPTIMIZATION_DOWNGRADE; 4691 warning ("\n***\n***\t-O%d converted to \"-O%d\" due to optimizer bugs on this platform\n***", 4692 optimize_val, 4693 FORCE_OPTIMIZATION_DOWNGRADE); 4694 4695 } 4696#endif /*FORCE_OPTIMIZATION_DOWNGRADE*/ 4697 4698#if defined(TRY_WITHOUT_THIS__alpha__) 4699 if (optimize > 1) 4700 { 4701 warning ("\n***\n***\tThe -O%d flag TRIGGERS KNOWN OPTIMIZER BUGS ON THIS PLATFORM\n***", 4702 optimize_val); 4703 } 4704#endif /*__alpha__*/ 4705 4706 optimize_size = 0; 4707 } 4708 } 4709 } 4710 } 4711 4712 if (!optimize) 4713 { 4714 flag_merge_constants = 0; 4715 } 4716 4717 if (optimize >= 1) 4718 { 4719 flag_defer_pop = 1; 4720 flag_thread_jumps = 1; 4721#ifdef DELAY_SLOTS 4722 flag_delayed_branch = 1; 4723#endif 4724#ifdef CAN_DEBUG_WITHOUT_FP 4725 flag_omit_frame_pointer = 1; 4726#endif 4727 flag_guess_branch_prob = 1; 4728 flag_cprop_registers = 1; 4729 } 4730 4731 if (optimize >= 2) 4732 { 4733 flag_optimize_sibling_calls = 1; 4734 flag_cse_follow_jumps = 1; 4735 flag_cse_skip_blocks = 1; 4736 flag_gcse = 1; 4737 flag_expensive_optimizations = 1; 4738 flag_strength_reduce = 1; 4739 flag_rerun_cse_after_loop = 1; 4740 flag_rerun_loop_opt = 1; 4741 flag_caller_saves = 1; 4742 flag_force_mem = 1; 4743 flag_peephole2 = 1; 4744#ifdef INSN_SCHEDULING 4745 flag_schedule_insns = 1; 4746 flag_schedule_insns_after_reload = 1; 4747#endif 4748 flag_regmove = 1; 4749 flag_strict_aliasing = 1; 4750 flag_delete_null_pointer_checks = 1; 4751 flag_reorder_blocks = 1; 4752 } 4753 4754 if (optimize >= 3) 4755 { 4756 flag_inline_functions = 1; 4757 flag_rename_registers = 1; 4758 } 4759 4760 if (optimize_size) 4761 { 4762 align_loops = 1; 4763 align_jumps = 1; 4764 align_labels = 1; 4765 align_functions = 1; 4766 } 4767 4768 /* Initialize whether `char' is signed. */ 4769 flag_signed_char = DEFAULT_SIGNED_CHAR; 4770#ifdef DEFAULT_SHORT_ENUMS 4771 /* Initialize how much space enums occupy, by default. */ 4772 flag_short_enums = DEFAULT_SHORT_ENUMS; 4773#endif 4774 4775 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can 4776 modify it. */ 4777 target_flags = 0; 4778 set_target_switch (""); 4779 4780 /* Unwind tables are always present in an ABI-conformant IA-64 4781 object file, so the default should be ON. */ 4782#ifdef IA64_UNWIND_INFO 4783 flag_unwind_tables = IA64_UNWIND_INFO; 4784#endif 4785 4786#ifdef OPTIMIZATION_OPTIONS 4787 /* Allow default optimizations to be specified on a per-machine basis. */ 4788 OPTIMIZATION_OPTIONS (optimize, optimize_size); 4789#endif 4790 4791 /* Perform normal command line switch decoding. */ 4792 for (i = 1; i < argc;) 4793 { 4794 int lang_processed; 4795 int indep_processed; 4796 4797 /* Give the language a chance to decode the option for itself. */ 4798 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i); 4799 4800 if (lang_processed >= 0) 4801 /* Now see if the option also has a language independent meaning. 4802 Some options are both language specific and language independent, 4803 eg --help. */ 4804 indep_processed = independent_decode_option (argc - i, argv + i); 4805 else 4806 { 4807 lang_processed = -lang_processed; 4808 indep_processed = 0; 4809 } 4810 4811 if (lang_processed || indep_processed) 4812 i += MAX (lang_processed, indep_processed); 4813 else 4814 { 4815 const char *option = NULL; 4816 const char *lang = NULL; 4817 unsigned int j; 4818 4819 /* It is possible that the command line switch is not valid for the 4820 current language, but it is valid for another language. In order 4821 to be compatible with previous versions of the compiler (which 4822 did not issue an error message in this case) we check for this 4823 possibility here. If we do find a match, then if extra_warnings 4824 is set we generate a warning message, otherwise we will just 4825 ignore the option. */ 4826 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++) 4827 { 4828 option = documented_lang_options[j].option; 4829 4830 if (option == NULL) 4831 lang = documented_lang_options[j].description; 4832 else if (! strncmp (argv[i], option, strlen (option))) 4833 break; 4834 } 4835 4836 if (j != ARRAY_SIZE (documented_lang_options)) 4837 { 4838 if (extra_warnings) 4839 { 4840 warning ("ignoring command line option '%s'", argv[i]); 4841 if (lang) 4842 warning 4843 ("(it is valid for %s but not the selected language)", 4844 lang); 4845 } 4846 } 4847 else if (argv[i][0] == '-' && argv[i][1] == 'g') 4848 warning ("`%s': unknown or unsupported -g option", &argv[i][2]); 4849 else 4850 error ("unrecognized option `%s'", argv[i]); 4851 4852 i++; 4853 } 4854 } 4855 4856 if (flag_no_inline == 2) 4857 flag_no_inline = 0; 4858 else 4859 flag_really_no_inline = flag_no_inline; 4860 4861 /* Set flag_no_inline before the post_options () hook. The C front 4862 ends use it to determine tree inlining defaults. FIXME: such 4863 code should be lang-independent when all front ends use tree 4864 inlining, in which case it, and this condition, should be moved 4865 to the top of process_options() instead. */ 4866 if (optimize == 0) 4867 { 4868 /* Inlining does not work if not optimizing, 4869 so force it not to be done. */ 4870 flag_no_inline = 1; 4871 warn_inline = 0; 4872 4873 /* The c_decode_option function and decode_option hook set 4874 this to `2' if -Wall is used, so we can avoid giving out 4875 lots of errors for people who don't realize what -Wall does. */ 4876 if (warn_uninitialized == 1) 4877 warning ("-Wuninitialized is not supported without -O"); 4878 } 4879 4880 if (flag_really_no_inline == 2) 4881 flag_really_no_inline = flag_no_inline; 4882 4883 /* All command line options have been parsed; allow the front end to 4884 perform consistency checks, etc. */ 4885 (*lang_hooks.post_options) (); 4886} 4887 4888/* Process the options that have been parsed. */ 4889static void 4890process_options () 4891{ 4892#ifdef OVERRIDE_OPTIONS 4893 /* Some machines may reject certain combinations of options. */ 4894 OVERRIDE_OPTIONS; 4895#endif 4896 4897 /* Set up the align_*_log variables, defaulting them to 1 if they 4898 were still unset. */ 4899 if (align_loops <= 0) align_loops = 1; 4900 if (align_loops_max_skip > align_loops || !align_loops) 4901 align_loops_max_skip = align_loops - 1; 4902 align_loops_log = floor_log2 (align_loops * 2 - 1); 4903 if (align_jumps <= 0) align_jumps = 1; 4904 if (align_jumps_max_skip > align_jumps || !align_jumps) 4905 align_jumps_max_skip = align_jumps - 1; 4906 align_jumps_log = floor_log2 (align_jumps * 2 - 1); 4907 if (align_labels <= 0) align_labels = 1; 4908 align_labels_log = floor_log2 (align_labels * 2 - 1); 4909 if (align_labels_max_skip > align_labels || !align_labels) 4910 align_labels_max_skip = align_labels - 1; 4911 if (align_functions <= 0) align_functions = 1; 4912 align_functions_log = floor_log2 (align_functions * 2 - 1); 4913 4914 /* Unrolling all loops implies that standard loop unrolling must also 4915 be done. */ 4916 if (flag_unroll_all_loops) 4917 flag_unroll_loops = 1; 4918 /* Loop unrolling requires that strength_reduction be on also. Silently 4919 turn on strength reduction here if it isn't already on. Also, the loop 4920 unrolling code assumes that cse will be run after loop, so that must 4921 be turned on also. */ 4922 if (flag_unroll_loops) 4923 { 4924 flag_strength_reduce = 1; 4925 flag_rerun_cse_after_loop = 1; 4926 } 4927 4928 if (flag_non_call_exceptions) 4929 flag_asynchronous_unwind_tables = 1; 4930 if (flag_asynchronous_unwind_tables) 4931 flag_unwind_tables = 1; 4932 4933 /* Warn about options that are not supported on this machine. */ 4934#ifndef INSN_SCHEDULING 4935 if (flag_schedule_insns || flag_schedule_insns_after_reload) 4936 warning ("instruction scheduling not supported on this target machine"); 4937#endif 4938#ifndef DELAY_SLOTS 4939 if (flag_delayed_branch) 4940 warning ("this target machine does not have delayed branches"); 4941#endif 4942 4943 /* Some operating systems do not allow profiling without a frame 4944 pointer. */ 4945 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER 4946 && profile_flag 4947 && flag_omit_frame_pointer) 4948 { 4949 error ("profiling does not work without a frame pointer"); 4950 flag_omit_frame_pointer = 0; 4951 } 4952 4953 user_label_prefix = USER_LABEL_PREFIX; 4954 if (flag_leading_underscore != -1) 4955 { 4956 /* If the default prefix is more complicated than "" or "_", 4957 issue a warning and ignore this option. */ 4958 if (user_label_prefix[0] == 0 || 4959 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0)) 4960 { 4961 user_label_prefix = flag_leading_underscore ? "_" : ""; 4962 } 4963 else 4964 warning ("-f%sleading-underscore not supported on this target machine", 4965 flag_leading_underscore ? "" : "no-"); 4966 } 4967 4968 /* If we are in verbose mode, write out the version and maybe all the 4969 option flags in use. */ 4970 if (version_flag) 4971 { 4972 print_version (stderr, ""); 4973 if (! quiet_flag) 4974 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n"); 4975 } 4976 4977 if (! quiet_flag) 4978 time_report = 1; 4979 4980 if (flag_syntax_only) 4981 { 4982 write_symbols = NO_DEBUG; 4983 profile_flag = 0; 4984 } 4985 4986 /* Now we know write_symbols, set up the debug hooks based on it. 4987 By default we do nothing for debug output. */ 4988#if defined(DBX_DEBUGGING_INFO) 4989 if (write_symbols == DBX_DEBUG) 4990 debug_hooks = &dbx_debug_hooks; 4991#endif 4992#if defined(XCOFF_DEBUGGING_INFO) 4993 if (write_symbols == XCOFF_DEBUG) 4994 debug_hooks = &xcoff_debug_hooks; 4995#endif 4996#ifdef SDB_DEBUGGING_INFO 4997 if (write_symbols == SDB_DEBUG) 4998 debug_hooks = &sdb_debug_hooks; 4999#endif 5000#ifdef DWARF_DEBUGGING_INFO 5001 if (write_symbols == DWARF_DEBUG) 5002 debug_hooks = &dwarf_debug_hooks; 5003#endif 5004#ifdef DWARF2_DEBUGGING_INFO 5005 if (write_symbols == DWARF2_DEBUG) 5006 debug_hooks = &dwarf2_debug_hooks; 5007#endif 5008#ifdef VMS_DEBUGGING_INFO 5009 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG) 5010 debug_hooks = &vmsdbg_debug_hooks; 5011#endif 5012 5013 /* If auxiliary info generation is desired, open the output file. 5014 This goes in the same directory as the source file--unlike 5015 all the other output files. */ 5016 if (flag_gen_aux_info) 5017 { 5018 aux_info_file = fopen (aux_info_file_name, "w"); 5019 if (aux_info_file == 0) 5020 fatal_io_error ("can't open %s", aux_info_file_name); 5021 } 5022 5023 if (! targetm.have_named_sections) 5024 { 5025 if (flag_function_sections) 5026 { 5027 warning ("-ffunction-sections not supported for this target"); 5028 flag_function_sections = 0; 5029 } 5030 if (flag_data_sections) 5031 { 5032 warning ("-fdata-sections not supported for this target"); 5033 flag_data_sections = 0; 5034 } 5035 } 5036 5037 if (flag_function_sections && profile_flag) 5038 { 5039 warning ("-ffunction-sections disabled; it makes profiling impossible"); 5040 flag_function_sections = 0; 5041 } 5042 5043#ifndef HAVE_prefetch 5044 if (flag_prefetch_loop_arrays) 5045 { 5046 warning ("-fprefetch-loop-arrays not supported for this target"); 5047 flag_prefetch_loop_arrays = 0; 5048 } 5049#else 5050 if (flag_prefetch_loop_arrays && !HAVE_prefetch) 5051 { 5052 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)"); 5053 flag_prefetch_loop_arrays = 0; 5054 } 5055#endif 5056 5057 /* This combination of options isn't handled for i386 targets and doesn't 5058 make much sense anyway, so don't allow it. */ 5059 if (flag_prefetch_loop_arrays && optimize_size) 5060 { 5061 warning ("-fprefetch-loop-arrays is not supported with -Os"); 5062 flag_prefetch_loop_arrays = 0; 5063 } 5064 5065#ifndef OBJECT_FORMAT_ELF 5066 if (flag_function_sections && write_symbols != NO_DEBUG) 5067 warning ("-ffunction-sections may affect debugging on some targets"); 5068#endif 5069} 5070 5071/* Language-independent initialization, before language-dependent 5072 initialization. */ 5073static void 5074lang_independent_init () 5075{ 5076 decl_printable_name = decl_name; 5077 lang_expand_expr = (lang_expand_expr_t) do_abort; 5078 5079 /* Set the language-dependent identifier size. */ 5080 tree_code_length[(int) IDENTIFIER_NODE] 5081 = ((lang_hooks.identifier_size - sizeof (struct tree_common) 5082 + sizeof (tree) - 1) / sizeof (tree)); 5083 5084 /* Initialize the garbage-collector, and string pools. */ 5085 init_ggc (); 5086 ggc_add_rtx_root (&stack_limit_rtx, 1); 5087 ggc_add_tree_root (¤t_function_decl, 1); 5088 ggc_add_tree_root (¤t_function_func_begin_label, 1); 5089 5090 init_stringpool (); 5091 init_obstacks (); 5092 5093 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL 5094 || debug_info_level == DINFO_LEVEL_VERBOSE 5095#ifdef VMS_DEBUGGING_INFO 5096 /* Enable line number info for traceback */ 5097 || debug_info_level > DINFO_LEVEL_NONE 5098#endif 5099 || flag_test_coverage 5100 || warn_notreached); 5101 init_regs (); 5102 init_alias_once (); 5103 init_stmt (); 5104 init_loop (); 5105 init_reload (); 5106 init_function_once (); 5107 init_stor_layout_once (); 5108 init_varasm_once (); 5109 init_EXPR_INSN_LIST_cache (); 5110 5111 /* The following initialization functions need to generate rtl, so 5112 provide a dummy function context for them. */ 5113 init_dummy_function_start (); 5114 init_expmed (); 5115 init_expr_once (); 5116 if (flag_caller_saves) 5117 init_caller_save (); 5118 expand_dummy_function_end (); 5119} 5120 5121/* Language-dependent initialization. Returns non-zero on success. */ 5122static int 5123lang_dependent_init (name) 5124 const char *name; 5125{ 5126 if (dump_base_name == 0) 5127 dump_base_name = name ? name : "gccdump"; 5128 5129 /* Front-end initialization. This hook can assume that GC, 5130 identifier hashes etc. are set up, but debug initialization is 5131 not done yet. This routine must return the original filename 5132 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */ 5133 name = (*lang_hooks.init) (name); 5134 if (name == NULL) 5135 return 0; 5136 5137 /* Is this duplication necessary? */ 5138 name = ggc_strdup (name); 5139 main_input_filename = input_filename = name; 5140 init_asm_output (name); 5141 5142 /* These create various _DECL nodes, so need to be called after the 5143 front end is initialized. */ 5144 init_eh (); 5145 init_optabs (); 5146 5147 /* Put an entry on the input file stack for the main input file. */ 5148 push_srcloc (input_filename, 0); 5149 5150 /* If dbx symbol table desired, initialize writing it and output the 5151 predefined types. */ 5152 timevar_push (TV_SYMOUT); 5153 5154#ifdef DWARF2_UNWIND_INFO 5155 if (dwarf2out_do_frame ()) 5156 dwarf2out_frame_init (); 5157#endif 5158 5159 /* Now we have the correct original filename, we can initialize 5160 debug output. */ 5161 (*debug_hooks->init) (name); 5162 5163 timevar_pop (TV_SYMOUT); 5164 5165 return 1; 5166} 5167 5168/* Clean up: close opened files, etc. */ 5169 5170static void 5171finalize () 5172{ 5173 /* Close the dump files. */ 5174 if (flag_gen_aux_info) 5175 { 5176 fclose (aux_info_file); 5177 if (errorcount) 5178 unlink (aux_info_file_name); 5179 } 5180 5181 /* Close non-debugging input and output files. Take special care to note 5182 whether fclose returns an error, since the pages might still be on the 5183 buffer chain while the file is open. */ 5184 5185 if (asm_out_file) 5186 { 5187 if (ferror (asm_out_file) != 0) 5188 fatal_io_error ("error writing to %s", asm_file_name); 5189 if (fclose (asm_out_file) != 0) 5190 fatal_io_error ("error closing %s", asm_file_name); 5191 } 5192 5193 /* Do whatever is necessary to finish printing the graphs. */ 5194 if (graph_dump_format != no_graph) 5195 { 5196 int i; 5197 5198 for (i = 0; i < (int) DFI_MAX; ++i) 5199 if (dump_file[i].initialized && dump_file[i].graph_dump_p) 5200 { 5201 char seq[16]; 5202 char *suffix; 5203 5204 sprintf (seq, DUMPFILE_FORMAT, i); 5205 suffix = concat (seq, dump_file[i].extension, NULL); 5206 finish_graph_dump_file (dump_base_name, suffix); 5207 free (suffix); 5208 } 5209 } 5210 5211 if (mem_report) 5212 { 5213 ggc_print_statistics (); 5214 stringpool_statistics (); 5215 dump_tree_statistics (); 5216 } 5217 5218 /* Free up memory for the benefit of leak detectors. */ 5219 free_reg_info (); 5220 5221 /* Language-specific end of compilation actions. */ 5222 (*lang_hooks.finish) (); 5223} 5224 5225/* Initialize the compiler, and compile the input file. */ 5226static void 5227do_compile () 5228{ 5229 /* The bulk of command line switch processing. */ 5230 process_options (); 5231 5232 /* We cannot start timing until after options are processed since that 5233 says if we run timers or not. */ 5234 init_timevar (); 5235 timevar_start (TV_TOTAL); 5236 5237 /* Language-independent initialization. Also sets up GC, identifier 5238 hashes etc. */ 5239 lang_independent_init (); 5240 5241 /* Language-dependent initialization. Returns true on success. */ 5242 if (lang_dependent_init (filename)) 5243 compile_file (); 5244 5245 finalize (); 5246 5247 /* Stop timing and print the times. */ 5248 timevar_stop (TV_TOTAL); 5249 timevar_print (stderr); 5250} 5251 5252/* Entry point of cc1, cc1plus, jc1, f771, etc. 5253 Decode command args, then call compile_file. 5254 Exit code is FATAL_EXIT_CODE if can't open files or if there were 5255 any errors, or SUCCESS_EXIT_CODE if compilation succeeded. 5256 5257 It is not safe to call this function more than once. */ 5258 5259int 5260toplev_main (argc, argv) 5261 int argc; 5262 char **argv; 5263{ 5264 hex_init (); 5265 5266 /* Initialization of GCC's environment, and diagnostics. */ 5267 general_init (argv [0]); 5268 5269 /* Parse the options and do minimal processing; basically just 5270 enough to default flags appropriately. */ 5271 parse_options_and_default_flags (argc, argv); 5272 5273 /* Exit early if we can (e.g. -help). */ 5274 if (!errorcount && !exit_after_options) 5275 do_compile (); 5276 5277 if (errorcount || sorrycount) 5278 return (FATAL_EXIT_CODE); 5279 5280 return (SUCCESS_EXIT_CODE); 5281} 5282