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.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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. */
30 #undef FLOAT /* This is for hpux. They should change hpux. */
31 #undef FFS /* Some systems define this in param.h. */
36 #ifdef HAVE_SYS_RESOURCE_H
37 # include <sys/resource.h>
40 #ifdef HAVE_SYS_TIMES_H
41 # include <sys/times.h>
49 #include "insn-attr.h"
50 #include "insn-config.h"
51 #include "insn-flags.h"
52 #include "hard-reg-set.h"
59 #include "basic-block.h"
66 #include "diagnostic.h"
70 #include "dwarf2asm.h"
71 #include "integrate.h"
74 #include "langhooks.h"
76 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
77 #include "dwarf2out.h"
80 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
84 #ifdef SDB_DEBUGGING_INFO
88 #ifdef XCOFF_DEBUGGING_INFO
89 #include "xcoffout.h" /* Needed for external data
90 declarations for e.g. AIX 4.x. */
98 /* The extra parameters substantially improve the I/O performance. */
101 vms_fopen (fname, type)
105 /* The <stdio.h> in the gcc-vms-1.42 distribution prototypes fopen with two
106 fixed arguments, which matches ANSI's specification but not VAXCRTL's
107 pre-ANSI implementation. This hack circumvents the mismatch problem. */
108 FILE *(*vmslib_fopen)() = (FILE *(*)()) fopen;
111 return (*vmslib_fopen) (fname, type, "mbc=32",
112 "deq=64", "fop=tef", "shr=nil");
114 return (*vmslib_fopen) (fname, type, "mbc=32");
117 #define fopen vms_fopen
120 /* Carry information from ASM_DECLARE_OBJECT_NAME
121 to ASM_FINISH_DECLARE_OBJECT. */
123 extern int size_directive_output;
124 extern tree last_assemble_variable_decl;
126 static void general_init PARAMS ((char *));
127 static void parse_options_and_default_flags PARAMS ((int, char **));
128 static void do_compile PARAMS ((void));
129 static void process_options PARAMS ((void));
130 static void lang_independent_init PARAMS ((void));
131 static int lang_dependent_init PARAMS ((const char *));
132 static void init_asm_output PARAMS ((const char *));
133 static void finalize PARAMS ((void));
135 static void set_target_switch PARAMS ((const char *));
136 static const char *decl_name PARAMS ((tree, int));
138 static void float_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
139 static void crash_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
140 static void set_float_handler PARAMS ((jmp_buf));
141 static void compile_file PARAMS ((void));
142 static void display_help PARAMS ((void));
143 static void display_target_options PARAMS ((void));
145 static void decode_d_option PARAMS ((const char *));
146 static int decode_f_option PARAMS ((const char *));
147 static int decode_W_option PARAMS ((const char *));
148 static int decode_g_option PARAMS ((const char *));
149 static unsigned int independent_decode_option PARAMS ((int, char **));
151 static void print_version PARAMS ((FILE *, const char *));
152 static int print_single_switch PARAMS ((FILE *, int, int, const char *,
153 const char *, const char *,
154 const char *, const char *));
155 static void print_switch_values PARAMS ((FILE *, int, int, const char *,
156 const char *, const char *));
158 /* Length of line when printing switch values. */
161 /* Name of program invoked, sans directories. */
163 const char *progname;
165 /* Copy of arguments to toplev_main. */
169 /* Name of current original source file (what was input to cpp).
170 This comes from each #-command in the actual input. */
172 const char *input_filename;
174 /* Name of top-level original source file (what was input to cpp).
175 This comes from the #-command at the beginning of the actual input.
176 If there isn't any there, then this is the cc1 input file name. */
178 const char *main_input_filename;
180 /* Current line number in real source file. */
184 /* Nonzero if it is unsafe to create any new pseudo registers. */
187 /* Stack of currently pending input files. */
189 struct file_stack *input_file_stack;
191 /* Incremented on each change to input_file_stack. */
192 int input_file_stack_tick;
194 /* Name to use as base of names for dump output files. */
196 const char *dump_base_name;
198 /* Format to use to print dumpfile index value */
199 #ifndef DUMPFILE_FORMAT
200 #define DUMPFILE_FORMAT ".%02d."
203 /* Bit flags that specify the machine subtype we are compiling for.
204 Bits are tested using macros TARGET_... defined in the tm.h file
205 and set by `-m...' switches. Must be defined in rtlanal.c. */
207 extern int target_flags;
209 /* Debug hooks - dependent upon command line options. */
211 struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks;
213 /* Describes a dump file. */
215 struct dump_file_info
217 /* The unique extension to apply, e.g. ".jump". */
218 const char *const extension;
220 /* The -d<c> character that enables this dump file. */
221 char const debug_switch;
223 /* True if there is a corresponding graph dump file. */
224 char const graph_dump_p;
226 /* True if the user selected this dump. */
229 /* True if the files have been initialized (ie truncated). */
233 /* Enumerate the extant dump files. */
272 /* Describes all the dump files. Should be kept in order of the
273 pass and in sync with dump_file_index above.
275 Remaining -d letters:
281 static struct dump_file_info dump_file[DFI_MAX] =
283 { "rtl", 'r', 0, 0, 0 },
284 { "sibling", 'i', 0, 0, 0 },
285 { "eh", 'h', 0, 0, 0 },
286 { "jump", 'j', 0, 0, 0 },
287 { "ssa", 'e', 1, 0, 0 },
288 { "ssaccp", 'W', 1, 0, 0 },
289 { "ssadce", 'X', 1, 0, 0 },
290 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
291 { "cse", 's', 0, 0, 0 },
292 { "addressof", 'F', 0, 0, 0 },
293 { "gcse", 'G', 1, 0, 0 },
294 { "loop", 'L', 1, 0, 0 },
295 { "cse2", 't', 1, 0, 0 },
296 { "cfg", 'f', 1, 0, 0 },
297 { "bp", 'b', 1, 0, 0 },
298 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
299 { "combine", 'c', 1, 0, 0 },
300 { "ce", 'C', 1, 0, 0 },
301 { "regmove", 'N', 1, 0, 0 },
302 { "sched", 'S', 1, 0, 0 },
303 { "lreg", 'l', 1, 0, 0 },
304 { "greg", 'g', 1, 0, 0 },
305 { "postreload", 'o', 1, 0, 0 },
306 { "flow2", 'w', 1, 0, 0 },
307 { "peephole2", 'z', 1, 0, 0 },
308 { "rnreg", 'n', 1, 0, 0 },
309 { "ce2", 'E', 1, 0, 0 },
310 { "sched2", 'R', 1, 0, 0 },
311 { "stack", 'k', 1, 0, 0 },
312 { "bbro", 'B', 1, 0, 0 },
313 { "mach", 'M', 1, 0, 0 },
314 { "dbr", 'd', 0, 0, 0 },
317 static int open_dump_file PARAMS ((enum dump_file_index, tree));
318 static void close_dump_file PARAMS ((enum dump_file_index,
319 void (*) (FILE *, rtx), rtx));
321 /* Other flags saying which kinds of debugging dump have been requested. */
323 int rtl_dump_and_exit;
324 int flag_print_asm_name;
325 static int version_flag;
326 static char *filename;
327 enum graph_dump_types graph_dump_format;
329 /* Name for output file of assembly code, specified with -o. */
333 /* Value of the -G xx switch, and whether it was passed or not. */
337 /* Type(s) of debugging information we are producing (if any).
338 See flags.h for the definitions of the different possible
339 types of debugging information. */
340 enum debug_info_type write_symbols = NO_DEBUG;
342 /* Level of debugging information we are producing. See flags.h
343 for the definitions of the different possible levels. */
344 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
346 /* Nonzero means use GNU-only extensions in the generated symbolic
347 debugging information. */
348 /* Currently, this only has an effect when write_symbols is set to
349 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
350 int use_gnu_debug_info_extensions = 0;
352 /* Nonzero means do optimizations. -O.
353 Particular numeric values stand for particular amounts of optimization;
354 thus, -O2 stores 2 here. However, the optimizations beyond the basic
355 ones are not controlled directly by this variable. Instead, they are
356 controlled by individual `flag_...' variables that are defaulted
357 based on this variable. */
361 /* Nonzero means optimize for size. -Os.
362 The only valid values are zero and non-zero. When optimize_size is
363 non-zero, optimize defaults to 2, but certain individual code
364 bloating optimizations are disabled. */
366 int optimize_size = 0;
368 /* Nonzero if we should exit after parsing options. */
369 static int exit_after_options = 0;
371 /* The FUNCTION_DECL for the function currently being compiled,
372 or 0 if between functions. */
373 tree current_function_decl;
375 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
377 tree current_function_func_begin_label;
379 /* Pointer to function to compute the name to use to print a declaration.
380 DECL is the declaration in question.
381 VERBOSITY determines what information will be printed:
382 0: DECL_NAME, demangled as necessary.
383 1: and scope information.
384 2: and any other information that might be interesting, such as function
385 parameter types in C++. */
387 const char *(*decl_printable_name) PARAMS ((tree, int));
389 /* Pointer to function to compute rtl for a language-specific tree code. */
391 typedef rtx (*lang_expand_expr_t)
392 PARAMS ((union tree_node *, rtx, enum machine_mode,
393 enum expand_modifier modifier));
395 lang_expand_expr_t lang_expand_expr = 0;
397 /* Pointer to function to finish handling an incomplete decl at the
398 end of compilation. */
400 void (*incomplete_decl_finalize_hook) PARAMS ((tree)) = 0;
402 /* Nonzero if doing dwarf2 duplicate elimination. */
404 int flag_eliminate_dwarf2_dups = 0;
406 /* Nonzero if generating code to do profiling. */
408 int profile_flag = 0;
410 /* Nonzero if generating code to profile program flow graph arcs. */
412 int profile_arc_flag = 0;
414 /* Nonzero if generating info for gcov to calculate line test coverage. */
416 int flag_test_coverage = 0;
418 /* Nonzero indicates that branch taken probabilities should be calculated. */
420 int flag_branch_probabilities = 0;
422 /* Nonzero if basic blocks should be reordered. */
424 int flag_reorder_blocks = 0;
426 /* Nonzero if registers should be renamed. */
428 int flag_rename_registers = 0;
429 int flag_cprop_registers = 0;
431 /* Nonzero for -pedantic switch: warn about anything
432 that standard spec forbids. */
436 /* Temporarily suppress certain warnings.
437 This is set while reading code from a system header file. */
439 int in_system_header = 0;
441 /* Don't print functions as they are compiled. -quiet. */
445 /* Print times taken by the various passes. -ftime-report. */
449 /* Print memory still in use at end of compilation (which may have little
450 to do with peak memory consumption). -fmem-report. */
454 /* Non-zero means to collect statistics which might be expensive
455 and to print them when we are done. */
456 int flag_detailed_statistics = 0;
461 /* Nonzero means `char' should be signed. */
463 int flag_signed_char;
465 /* Nonzero means give an enum type only as many bytes as it needs. */
467 int flag_short_enums;
469 /* Nonzero for -fcaller-saves: allocate values in regs that need to
470 be saved across function calls, if that produces overall better code.
471 Optional now, so people can test it. */
473 #ifdef DEFAULT_CALLER_SAVES
474 int flag_caller_saves = 1;
476 int flag_caller_saves = 0;
479 /* Nonzero if structures and unions should be returned in memory.
481 This should only be defined if compatibility with another compiler or
482 with an ABI is needed, because it results in slower code. */
484 #ifndef DEFAULT_PCC_STRUCT_RETURN
485 #define DEFAULT_PCC_STRUCT_RETURN 1
488 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
490 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
492 /* Nonzero for -fforce-mem: load memory value into a register
493 before arithmetic on it. This makes better cse but slower compilation. */
495 int flag_force_mem = 0;
497 /* Nonzero for -fforce-addr: load memory address into a register before
498 reference to memory. This makes better cse but slower compilation. */
500 int flag_force_addr = 0;
502 /* Nonzero for -fdefer-pop: don't pop args after each function call;
503 instead save them up to pop many calls' args with one insns. */
505 int flag_defer_pop = 0;
507 /* Nonzero for -ffloat-store: don't allocate floats and doubles
508 in extended-precision registers. */
510 int flag_float_store = 0;
512 /* Nonzero for -fcse-follow-jumps:
513 have cse follow jumps to do a more extensive job. */
515 int flag_cse_follow_jumps;
517 /* Nonzero for -fcse-skip-blocks:
518 have cse follow a branch around a block. */
519 int flag_cse_skip_blocks;
521 /* Nonzero for -fexpensive-optimizations:
522 perform miscellaneous relatively-expensive optimizations. */
523 int flag_expensive_optimizations;
525 /* Nonzero for -fthread-jumps:
526 have jump optimize output of loop. */
528 int flag_thread_jumps;
530 /* Nonzero enables strength-reduction in loop.c. */
532 int flag_strength_reduce = 0;
534 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
535 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
536 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
539 int flag_unroll_loops;
541 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
542 This is generally not a win. */
544 int flag_unroll_all_loops;
546 /* Nonzero enables prefetch optimizations for arrays in loops. */
548 int flag_prefetch_loop_arrays;
550 /* Nonzero forces all invariant computations in loops to be moved
553 int flag_move_all_movables = 0;
555 /* Nonzero forces all general induction variables in loops to be
558 int flag_reduce_all_givs = 0;
560 /* Nonzero to perform full register move optimization passes. This is the
563 int flag_regmove = 0;
565 /* Nonzero for -fwritable-strings:
566 store string constants in data segment and don't uniquize them. */
568 int flag_writable_strings = 0;
570 /* Nonzero means don't put addresses of constant functions in registers.
571 Used for compiling the Unix kernel, where strange substitutions are
572 done on the assembly output. */
574 int flag_no_function_cse = 0;
576 /* Nonzero for -fomit-frame-pointer:
577 don't make a frame pointer in simple functions that don't require one. */
579 int flag_omit_frame_pointer = 0;
581 /* Nonzero means place each function into its own section on those platforms
582 which support arbitrary section names and unlimited numbers of sections. */
584 int flag_function_sections = 0;
586 /* ... and similar for data. */
588 int flag_data_sections = 0;
590 /* Nonzero to inhibit use of define_optimization peephole opts. */
592 int flag_no_peephole = 0;
594 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
596 int flag_optimize_sibling_calls = 0;
598 /* Nonzero means the front end generally wants `errno' maintained by math
599 operations, like built-in SQRT. */
601 int flag_errno_math = 1;
603 /* Nonzero means that unsafe floating-point math optimizations are allowed
604 for the sake of speed. IEEE compliance is not guaranteed, and operations
605 are allowed to assume that their arguments and results are "normal"
606 (e.g., nonnegative for SQRT). */
608 int flag_unsafe_math_optimizations = 0;
610 /* Zero means that floating-point math operations cannot generate a
611 (user-visible) trap. This is the case, for example, in nonstop
612 IEEE 754 arithmetic. */
614 int flag_trapping_math = 1;
616 /* 0 means straightforward implementation of complex divide acceptable.
617 1 means wide ranges of inputs must work for complex divide.
618 2 means C99-like requirements for complex divide (not yet implemented). */
620 int flag_complex_divide_method = 0;
622 /* Nonzero means all references through pointers are volatile. */
626 /* Nonzero means treat all global and extern variables as volatile. */
628 int flag_volatile_global;
630 /* Nonzero means treat all static variables as volatile. */
632 int flag_volatile_static;
634 /* Nonzero means just do syntax checking; don't output anything. */
636 int flag_syntax_only = 0;
638 /* Nonzero means perform global cse. */
640 static int flag_gcse;
642 /* Nonzero means to use global dataflow analysis to eliminate
643 useless null pointer tests. */
645 static int flag_delete_null_pointer_checks;
647 /* Nonzero means to do the enhanced load motion during gcse, which trys
648 to hoist loads by not killing them when a store to the same location
651 int flag_gcse_lm = 1;
653 /* Nonzero means to perform store motion after gcse, which will try to
654 move stores closer to the exit block. Its not very effective without
657 int flag_gcse_sm = 1;
659 /* Nonzero means to rerun cse after loop optimization. This increases
660 compilation time about 20% and picks up a few more common expressions. */
662 static int flag_rerun_cse_after_loop;
664 /* Nonzero means to run loop optimizations twice. */
666 int flag_rerun_loop_opt;
668 /* Nonzero for -finline-functions: ok to inline functions that look like
669 good inline candidates. */
671 int flag_inline_functions;
673 /* Nonzero for -fkeep-inline-functions: even if we make a function
674 go inline everywhere, keep its definition around for debugging
677 int flag_keep_inline_functions;
679 /* Nonzero means that functions will not be inlined. */
683 /* Nonzero means that we should emit static const variables
684 regardless of whether or not optimization is turned on. */
686 int flag_keep_static_consts = 1;
688 /* Nonzero means we should be saving declaration info into a .X file. */
690 int flag_gen_aux_info = 0;
692 /* Specified name of aux-info file. */
694 static char *aux_info_file_name;
696 /* Nonzero means make the text shared if supported. */
698 int flag_shared_data;
700 /* Nonzero means schedule into delayed branch slots if supported. */
702 int flag_delayed_branch;
704 /* Nonzero if we are compiling pure (sharable) code.
705 Value is 1 if we are doing reasonable (i.e. simple
706 offset into offset table) pic. Value is 2 if we can
707 only perform register offsets. */
711 /* Nonzero means generate extra code for exception handling and enable
712 exception handling. */
716 /* Nonzero means generate frame unwind info table when supported. */
718 int flag_unwind_tables = 0;
720 /* Nonzero means generate frame unwind info table exact at each insn boundary */
722 int flag_asynchronous_unwind_tables = 0;
724 /* Nonzero means don't place uninitialized global data in common storage
729 /* Nonzero means pretend it is OK to examine bits of target floats,
730 even if that isn't true. The resulting code will have incorrect constants,
731 but the same series of instructions that the native compiler would make. */
733 int flag_pretend_float;
735 /* Nonzero means change certain warnings into errors.
736 Usually these are warnings about failure to conform to some standard. */
738 int flag_pedantic_errors = 0;
740 /* flag_schedule_insns means schedule insns within basic blocks (before
742 flag_schedule_insns_after_reload means schedule insns after
745 int flag_schedule_insns = 0;
746 int flag_schedule_insns_after_reload = 0;
748 /* The following flags have effect only for scheduling before register
751 flag_schedule_interblock means schedule insns accross basic blocks.
752 flag_schedule_speculative means allow speculative motion of non-load insns.
753 flag_schedule_speculative_load means allow speculative motion of some
755 flag_schedule_speculative_load_dangerous allows speculative motion of more
758 int flag_schedule_interblock = 1;
759 int flag_schedule_speculative = 1;
760 int flag_schedule_speculative_load = 0;
761 int flag_schedule_speculative_load_dangerous = 0;
763 int flag_single_precision_constant;
765 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
766 by a cheaper branch on a count register. */
767 int flag_branch_on_count_reg = 1;
769 /* -finhibit-size-directive inhibits output of .size for ELF.
770 This is used only for compiling crtstuff.c,
771 and it may be extended to other effects
772 needed for crtstuff.c on other systems. */
773 int flag_inhibit_size_directive = 0;
775 /* -fverbose-asm causes extra commentary information to be produced in
776 the generated assembly code (to make it more readable). This option
777 is generally only of use to those who actually need to read the
778 generated assembly code (perhaps while debugging the compiler itself).
779 -fno-verbose-asm, the default, causes the extra information
780 to be omitted and is useful when comparing two assembler files. */
782 int flag_verbose_asm = 0;
784 /* -dA causes debug commentary information to be produced in
785 the generated assembly code (to make it more readable). This option
786 is generally only of use to those who actually need to read the
787 generated assembly code (perhaps while debugging the compiler itself).
788 Currently, this switch is only used by dwarfout.c; however, it is intended
789 to be a catchall for printing debug information in the assembler file. */
791 int flag_debug_asm = 0;
793 /* -dP causes the rtl to be emitted as a comment in assembly. */
795 int flag_dump_rtl_in_asm = 0;
797 /* -fgnu-linker specifies use of the GNU linker for initializations.
798 (Or, more generally, a linker that handles initializations.)
799 -fno-gnu-linker says that collect2 will be used. */
801 int flag_gnu_linker = 0;
803 int flag_gnu_linker = 1;
809 /* Enable ssa conditional constant propagation. */
810 int flag_ssa_ccp = 0;
812 /* Enable ssa aggressive dead code elimination. */
813 int flag_ssa_dce = 0;
815 /* Tag all structures with __attribute__(packed). */
816 int flag_pack_struct = 0;
818 /* Nonzero means that -Wformat accepts certain system-dependent formats. */
819 int flag_format_extensions = 0;
821 /* Emit code to check for stack overflow; also may cause large objects
822 to be allocated dynamically. */
823 int flag_stack_check;
825 /* When non-NULL, indicates that whenever space is allocated on the
826 stack, the resulting stack pointer must not pass this
827 address---that is, for stacks that grow downward, the stack pointer
828 must always be greater than or equal to this address; for stacks
829 that grow upward, the stack pointer must be less than this address.
830 At present, the rtx may be either a REG or a SYMBOL_REF, although
831 the support provided depends on the backend. */
834 /* 0 if pointer arguments may alias each other. True in C.
835 1 if pointer arguments may not alias each other but may alias
837 2 if pointer arguments may not alias each other and may not
838 alias global variables. True in Fortran.
839 This defaults to 0 for C. */
840 int flag_argument_noalias = 0;
842 /* Nonzero if we should do (language-dependent) alias analysis.
843 Typically, this analysis will assume that expressions of certain
844 types do not alias expressions of certain other types. Only used
845 if alias analysis (in general) is enabled. */
846 int flag_strict_aliasing = 0;
848 /* Instrument functions with calls at entry and exit, for profiling. */
849 int flag_instrument_function_entry_exit = 0;
851 /* Nonzero means ignore `#ident' directives. 0 means handle them.
852 On SVR4 targets, it also controls whether or not to emit a
853 string identifying the compiler. */
855 int flag_no_ident = 0;
857 /* This will perform a peephole pass before sched2. */
858 int flag_peephole2 = 0;
860 /* This will try to guess branch probabilities. */
861 int flag_guess_branch_prob = 0;
863 /* -fbounded-pointers causes gcc to compile pointers as composite
864 objects occupying three words: the pointer value, the base address
865 of the referent object, and the address immediately beyond the end
866 of the referent object. The base and extent allow us to perform
867 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
868 int flag_bounded_pointers = 0;
870 /* -fcheck-bounds causes gcc to generate array bounds checks.
871 For C, C++: defaults to value of flag_bounded_pointers.
872 For ObjC: defaults to off.
873 For Java: defaults to on.
874 For Fortran: defaults to off.
875 For CHILL: defaults to off. */
876 int flag_bounds_check = 0;
878 /* This will attempt to merge constant section constants, if 1 only
879 string constants and constants from constant pool, if 2 also constant
881 int flag_merge_constants = 1;
883 /* If one, renumber instruction UIDs to reduce the number of
884 unused UIDs if there are a lot of instructions. If greater than
885 one, unconditionally renumber instruction UIDs. */
886 int flag_renumber_insns = 1;
888 /* Values of the -falign-* flags: how much to align labels in code.
889 0 means `use default', 1 means `don't align'.
890 For each variable, there is an _log variant which is the power
891 of two not less than the variable, for .align output. */
895 int align_loops_max_skip;
898 int align_jumps_max_skip;
900 int align_labels_log;
901 int align_labels_max_skip;
903 int align_functions_log;
905 /* Table of supported debugging formats. */
908 const char *const arg;
909 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
910 constant expression, we use NO_DEBUG in its place. */
911 const enum debug_info_type debug_type;
912 const int use_extensions_p;
913 const char *const description;
917 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
918 N_("Generate debugging info in default format") },
919 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
920 #ifdef DBX_DEBUGGING_INFO
921 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
922 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
924 #ifdef DWARF_DEBUGGING_INFO
925 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
926 { "dwarf+", DWARF_DEBUG, 1,
927 N_("Generate extended DWARF-1 format debug info") },
929 #ifdef DWARF2_DEBUGGING_INFO
930 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
932 #ifdef XCOFF_DEBUGGING_INFO
933 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
934 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
936 #ifdef SDB_DEBUGGING_INFO
937 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
944 const char *const string;
947 const char *const description;
949 lang_independent_options;
953 /* Add or remove a leading underscore from user symbols. */
954 int flag_leading_underscore = -1;
956 /* The user symbol prefix after having resolved same. */
957 const char *user_label_prefix;
959 static const param_info lang_independent_params[] = {
960 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
961 { OPTION, DEFAULT, HELP },
962 #include "params.def"
967 /* A default for same. */
968 #ifndef USER_LABEL_PREFIX
969 #define USER_LABEL_PREFIX ""
972 /* Table of language-independent -f options.
973 STRING is the option name. VARIABLE is the address of the variable.
974 ON_VALUE is the value to store in VARIABLE
975 if `-fSTRING' is seen as an option.
976 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
978 static const lang_independent_options f_options[] =
980 {"format-extensions", &flag_format_extensions, 1,
981 N_("-Wformat accepts certain FreeBSD system-dependent formats") },
982 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
983 N_("Perform DWARF2 duplicate elimination") },
984 {"float-store", &flag_float_store, 1,
985 N_("Do not store floats in registers") },
986 {"volatile", &flag_volatile, 1,
987 N_("Consider all mem refs through pointers as volatile") },
988 {"volatile-global", &flag_volatile_global, 1,
989 N_("Consider all mem refs to global data to be volatile") },
990 {"volatile-static", &flag_volatile_static, 1,
991 N_("Consider all mem refs to static data to be volatile") },
992 {"defer-pop", &flag_defer_pop, 1,
993 N_("Defer popping functions args from stack until later") },
994 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
995 N_("When possible do not generate stack frames") },
996 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
997 N_("Optimize sibling and tail recursive calls") },
998 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
999 N_("When running CSE, follow jumps to their targets") },
1000 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
1001 N_("When running CSE, follow conditional jumps") },
1002 {"expensive-optimizations", &flag_expensive_optimizations, 1,
1003 N_("Perform a number of minor, expensive optimizations") },
1004 {"thread-jumps", &flag_thread_jumps, 1,
1005 N_("Perform jump threading optimizations") },
1006 {"strength-reduce", &flag_strength_reduce, 1,
1007 N_("Perform strength reduction optimizations") },
1008 {"unroll-loops", &flag_unroll_loops, 1,
1009 N_("Perform loop unrolling when iteration count is known") },
1010 {"unroll-all-loops", &flag_unroll_all_loops, 1,
1011 N_("Perform loop unrolling for all loops") },
1012 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
1013 N_("Generate prefetch instructions, if available, for arrays in loops") },
1014 {"move-all-movables", &flag_move_all_movables, 1,
1015 N_("Force all loop invariant computations out of loops") },
1016 {"reduce-all-givs", &flag_reduce_all_givs, 1,
1017 N_("Strength reduce all loop general induction variables") },
1018 {"writable-strings", &flag_writable_strings, 1,
1019 N_("Store strings in writable data section") },
1020 {"peephole", &flag_no_peephole, 0,
1021 N_("Enable machine specific peephole optimizations") },
1022 {"force-mem", &flag_force_mem, 1,
1023 N_("Copy memory operands into registers before using") },
1024 {"force-addr", &flag_force_addr, 1,
1025 N_("Copy memory address constants into regs before using") },
1026 {"function-cse", &flag_no_function_cse, 0,
1027 N_("Allow function addresses to be held in registers") },
1028 {"inline-functions", &flag_inline_functions, 1,
1029 N_("Integrate simple functions into their callers") },
1030 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1031 N_("Generate code for funcs even if they are fully inlined") },
1032 {"inline", &flag_no_inline, 0,
1033 N_("Pay attention to the 'inline' keyword") },
1034 {"keep-static-consts", &flag_keep_static_consts, 1,
1035 N_("Emit static const variables even if they are not used") },
1036 {"syntax-only", &flag_syntax_only, 1,
1037 N_("Check for syntax errors, then stop") },
1038 {"shared-data", &flag_shared_data, 1,
1039 N_("Mark data as shared rather than private") },
1040 {"caller-saves", &flag_caller_saves, 1,
1041 N_("Enable saving registers around function calls") },
1042 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1043 N_("Return 'short' aggregates in memory, not registers") },
1044 {"reg-struct-return", &flag_pcc_struct_return, 0,
1045 N_("Return 'short' aggregates in registers") },
1046 {"delayed-branch", &flag_delayed_branch, 1,
1047 N_("Attempt to fill delay slots of branch instructions") },
1048 {"gcse", &flag_gcse, 1,
1049 N_("Perform the global common subexpression elimination") },
1050 {"gcse-lm", &flag_gcse_lm, 1,
1051 N_("Perform enhanced load motion during global subexpression elimination") },
1052 {"gcse-sm", &flag_gcse_sm, 1,
1053 N_("Perform store motion after global subexpression elimination") },
1054 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1055 N_("Run CSE pass after loop optimizations") },
1056 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1057 N_("Run the loop optimizer twice") },
1058 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1059 N_("Delete useless null pointer checks") },
1060 {"pretend-float", &flag_pretend_float, 1,
1061 N_("Pretend that host and target use the same FP format") },
1062 {"schedule-insns", &flag_schedule_insns, 1,
1063 N_("Reschedule instructions before register allocation") },
1064 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1065 N_("Reschedule instructions after register allocation") },
1066 {"sched-interblock",&flag_schedule_interblock, 1,
1067 N_("Enable scheduling across basic blocks") },
1068 {"sched-spec",&flag_schedule_speculative, 1,
1069 N_("Allow speculative motion of non-loads") },
1070 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1071 N_("Allow speculative motion of some loads") },
1072 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1073 N_("Allow speculative motion of more loads") },
1074 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1075 N_("Replace add,compare,branch with branch on count reg") },
1076 {"pic", &flag_pic, 1,
1077 N_("Generate position independent code, if possible") },
1078 {"PIC", &flag_pic, 2, ""},
1079 {"exceptions", &flag_exceptions, 1,
1080 N_("Enable exception handling") },
1081 {"unwind-tables", &flag_unwind_tables, 1,
1082 N_("Just generate unwind tables for exception handling") },
1083 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1084 N_("Generate unwind tables exact at each instruction boundary") },
1085 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1086 N_("Support synchronous non-call exceptions") },
1087 {"profile-arcs", &profile_arc_flag, 1,
1088 N_("Insert arc based program profiling code") },
1089 {"test-coverage", &flag_test_coverage, 1,
1090 N_("Create data files needed by gcov") },
1091 {"branch-probabilities", &flag_branch_probabilities, 1,
1092 N_("Use profiling information for branch probabilities") },
1093 {"reorder-blocks", &flag_reorder_blocks, 1,
1094 N_("Reorder basic blocks to improve code placement") },
1095 {"rename-registers", &flag_rename_registers, 1,
1096 N_("Do the register renaming optimization pass") },
1097 {"cprop-registers", &flag_cprop_registers, 1,
1098 N_("Do the register copy-propagation optimization pass") },
1099 {"common", &flag_no_common, 0,
1100 N_("Do not put uninitialized globals in the common section") },
1101 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1102 N_("Do not generate .size directives") },
1103 {"function-sections", &flag_function_sections, 1,
1104 N_("place each function into its own section") },
1105 {"data-sections", &flag_data_sections, 1,
1106 N_("place data items into their own section") },
1107 {"verbose-asm", &flag_verbose_asm, 1,
1108 N_("Add extra commentry to assembler output") },
1109 {"gnu-linker", &flag_gnu_linker, 1,
1110 N_("Output GNU ld formatted global initializers") },
1111 {"regmove", &flag_regmove, 1,
1112 N_("Enables a register move optimization") },
1113 {"optimize-register-move", &flag_regmove, 1,
1114 N_("Do the full regmove optimization pass") },
1115 {"pack-struct", &flag_pack_struct, 1,
1116 N_("Pack structure members together without holes") },
1117 {"stack-check", &flag_stack_check, 1,
1118 N_("Insert stack checking code into the program") },
1119 {"argument-alias", &flag_argument_noalias, 0,
1120 N_("Specify that arguments may alias each other & globals") },
1121 {"argument-noalias", &flag_argument_noalias, 1,
1122 N_("Assume arguments may alias globals but not each other") },
1123 {"argument-noalias-global", &flag_argument_noalias, 2,
1124 N_("Assume arguments do not alias each other or globals") },
1125 {"strict-aliasing", &flag_strict_aliasing, 1,
1126 N_("Assume strict aliasing rules apply") },
1127 {"align-loops", &align_loops, 0,
1128 N_("Align the start of loops") },
1129 {"align-jumps", &align_jumps, 0,
1130 N_("Align labels which are only reached by jumping") },
1131 {"align-labels", &align_labels, 0,
1132 N_("Align all labels") },
1133 {"align-functions", &align_functions, 0,
1134 N_("Align the start of functions") },
1135 {"merge-constants", &flag_merge_constants, 1,
1136 N_("Attempt to merge identical constants accross compilation units") },
1137 {"merge-all-constants", &flag_merge_constants, 2,
1138 N_("Attempt to merge identical constants and constant variables") },
1139 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1140 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1141 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1142 N_("Instrument function entry/exit with profiling calls") },
1143 {"ssa", &flag_ssa, 1,
1144 N_("Enable SSA optimizations") },
1145 {"ssa-ccp", &flag_ssa_ccp, 1,
1146 N_("Enable SSA conditional constant propagation") },
1147 {"ssa-dce", &flag_ssa_dce, 1,
1148 N_("Enable aggressive SSA dead code elimination") },
1149 {"leading-underscore", &flag_leading_underscore, 1,
1150 N_("External symbols have a leading underscore") },
1151 {"ident", &flag_no_ident, 0,
1152 N_("Process #ident directives") },
1153 { "peephole2", &flag_peephole2, 1,
1154 N_("Enables an rtl peephole pass run before sched2") },
1155 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1156 N_("Enables guessing of branch probabilities") },
1157 {"math-errno", &flag_errno_math, 1,
1158 N_("Set errno after built-in math functions") },
1159 {"trapping-math", &flag_trapping_math, 1,
1160 N_("Floating-point operations can trap") },
1161 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1162 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1163 {"bounded-pointers", &flag_bounded_pointers, 1,
1164 N_("Compile pointers as triples: value, base & end") },
1165 {"bounds-check", &flag_bounds_check, 1,
1166 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1167 {"single-precision-constant", &flag_single_precision_constant, 1,
1168 N_("Convert floating point constant to single precision constant") },
1169 {"time-report", &time_report, 1,
1170 N_("Report time taken by each compiler pass at end of run") },
1171 {"mem-report", &mem_report, 1,
1172 N_("Report on permanent memory allocation at end of run") },
1173 { "trapv", &flag_trapv, 1,
1174 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1177 /* Table of language-specific options. */
1179 static const struct lang_opt
1181 const char *const option;
1182 const char *const description;
1184 documented_lang_options[] =
1186 /* In order not to overload the --help output, the convention
1187 used here is to only describe those options which are not
1188 enabled by default. */
1191 N_("Compile just for ISO C89") },
1192 { "-fallow-single-precision",
1193 N_("Do not promote floats to double if using -traditional") },
1195 N_("Determine language standard") },
1197 { "-fsigned-bitfields", "" },
1198 { "-funsigned-bitfields",
1199 N_("Make bit-fields by unsigned by default") },
1200 { "-fno-signed-bitfields", "" },
1201 { "-fno-unsigned-bitfields","" },
1203 N_("Make 'char' be signed by default") },
1204 { "-funsigned-char",
1205 N_("Make 'char' be unsigned by default") },
1206 { "-fno-signed-char", "" },
1207 { "-fno-unsigned-char", "" },
1209 { "-ftraditional", "" },
1211 N_("Attempt to support traditional K&R style C") },
1212 { "-fnotraditional", "" },
1213 { "-fno-traditional", "" },
1217 N_("Do not recognize the 'asm' keyword") },
1218 { "-fbuiltin", "" },
1220 N_("Do not recognize any built in functions") },
1222 N_("Assume normal C execution environment") },
1223 { "-fno-hosted", "" },
1225 N_("Assume that standard libraries & main might not exist") },
1226 { "-fno-freestanding", "" },
1227 { "-fcond-mismatch",
1228 N_("Allow different types as args of ? operator") },
1229 { "-fno-cond-mismatch", "" },
1230 { "-fdollars-in-identifiers",
1231 N_("Allow the use of $ inside identifiers") },
1232 { "-fno-dollars-in-identifiers", "" },
1233 { "-fpreprocessed", "" },
1234 { "-fno-preprocessed", "" },
1236 N_("Use the same size for double as for float") },
1237 { "-fno-short-double", "" },
1239 N_("Use the smallest fitting integer to hold enums") },
1240 { "-fno-short-enums", "" },
1242 N_("Override the underlying type for wchar_t to `unsigned short'") },
1243 { "-fno-short-wchar", "" },
1246 N_("Enable most warning messages") },
1247 { "-Wbad-function-cast",
1248 N_("Warn about casting functions to incompatible types") },
1249 { "-Wno-bad-function-cast", "" },
1250 { "-Wno-missing-noreturn", "" },
1251 { "-Wmissing-format-attribute",
1252 N_("Warn about functions which might be candidates for format attributes") },
1253 { "-Wno-missing-format-attribute", "" },
1255 N_("Warn about casts which discard qualifiers") },
1256 { "-Wno-cast-qual", "" },
1257 { "-Wchar-subscripts",
1258 N_("Warn about subscripts whose type is 'char'") },
1259 { "-Wno-char-subscripts", "" },
1261 N_("Warn if nested comments are detected") },
1262 { "-Wno-comment", "" },
1264 N_("Warn if nested comments are detected") },
1265 { "-Wno-comments", "" },
1267 N_("Warn about possibly confusing type conversions") },
1268 { "-Wno-conversion", "" },
1270 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1271 { "-Wno-format", "" },
1272 { "-Wformat-y2k", "" },
1273 { "-Wno-format-y2k",
1274 N_("Don't warn about strftime formats yielding 2 digit years") },
1275 { "-Wformat-extra-args", "" },
1276 { "-Wno-format-extra-args",
1277 N_("Don't warn about too many arguments to format functions") },
1278 { "-Wformat-nonliteral",
1279 N_("Warn about non-string-literal format strings") },
1280 { "-Wno-format-nonliteral", "" },
1281 { "-Wformat-security",
1282 N_("Warn about possible security problems with format functions") },
1283 { "-Wno-format-security", "" },
1284 { "-Wimplicit-function-declaration",
1285 N_("Warn about implicit function declarations") },
1286 { "-Wno-implicit-function-declaration", "" },
1287 { "-Werror-implicit-function-declaration", "" },
1289 N_("Warn when a declaration does not specify a type") },
1290 { "-Wno-implicit-int", "" },
1291 { "-Wimplicit", "" },
1292 { "-Wno-implicit", "" },
1294 N_("Warn about the use of the #import directive") },
1295 { "-Wno-import", "" },
1296 { "-Wlong-long","" },
1298 N_("Do not warn about using 'long long' when -pedantic") },
1300 N_("Warn about suspicious declarations of main") },
1301 { "-Wno-main", "" },
1302 { "-Wmissing-braces",
1303 N_("Warn about possibly missing braces around initializers") },
1304 { "-Wno-missing-braces", "" },
1305 { "-Wmissing-declarations",
1306 N_("Warn about global funcs without previous declarations") },
1307 { "-Wno-missing-declarations", "" },
1308 { "-Wmissing-prototypes",
1309 N_("Warn about global funcs without prototypes") },
1310 { "-Wno-missing-prototypes", "" },
1312 N_("Warn about use of multicharacter literals") },
1313 { "-Wno-multichar", "" },
1314 { "-Wnested-externs",
1315 N_("Warn about externs not at file scope level") },
1316 { "-Wno-nested-externs", "" },
1318 N_("Warn about possible missing parentheses") },
1319 { "-Wno-parentheses", "" },
1320 { "-Wsequence-point",
1321 N_("Warn about possible violations of sequence point rules") },
1322 { "-Wno-sequence-point", "" },
1323 { "-Wpointer-arith",
1324 N_("Warn about function pointer arithmetic") },
1325 { "-Wno-pointer-arith", "" },
1326 { "-Wredundant-decls",
1327 N_("Warn about multiple declarations of the same object") },
1328 { "-Wno-redundant-decls", "" },
1330 N_("Warn about signed/unsigned comparisons") },
1331 { "-Wno-sign-compare", "" },
1333 N_("Warn about testing equality of floating point numbers") },
1334 { "-Wno-float-equal", "" },
1335 { "-Wunknown-pragmas",
1336 N_("Warn about unrecognized pragmas") },
1337 { "-Wno-unknown-pragmas", "" },
1338 { "-Wstrict-prototypes",
1339 N_("Warn about non-prototyped function decls") },
1340 { "-Wno-strict-prototypes", "" },
1342 N_("Warn about constructs whose meaning change in ISO C") },
1343 { "-Wno-traditional", "" },
1345 N_("Warn when trigraphs are encountered") },
1346 { "-Wno-trigraphs", "" },
1348 { "-Wno-undef", "" },
1349 { "-Wwrite-strings",
1350 N_("Mark strings as 'const char *'") },
1351 { "-Wno-write-strings", "" },
1353 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1355 #include "options.h"
1359 /* Here is a table, controlled by the tm.h file, listing each -m switch
1360 and which bits in `target_switches' it should set or clear.
1361 If VALUE is positive, it is bits to set.
1362 If VALUE is negative, -VALUE is bits to clear.
1363 (The sign bit is not used so there is no confusion.) */
1367 const char *const name;
1369 const char *const description;
1371 target_switches [] = TARGET_SWITCHES;
1373 /* This table is similar, but allows the switch to have a value. */
1375 #ifdef TARGET_OPTIONS
1378 const char *const prefix;
1379 const char **const variable;
1380 const char *const description;
1382 target_options [] = TARGET_OPTIONS;
1385 /* Options controlling warnings. */
1387 /* Don't print warning messages. -w. */
1389 int inhibit_warnings = 0;
1391 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1393 int warn_system_headers = 0;
1395 /* Print various extra warnings. -W. */
1397 int extra_warnings = 0;
1399 /* Treat warnings as errors. -Werror. */
1401 int warnings_are_errors = 0;
1403 /* Nonzero to warn about unused variables, functions et.al. */
1405 int warn_unused_function;
1406 int warn_unused_label;
1407 int warn_unused_parameter;
1408 int warn_unused_variable;
1409 int warn_unused_value;
1411 /* Nonzero to warn about code which is never reached. */
1413 int warn_notreached;
1415 /* Nonzero to warn about variables used before they are initialized. */
1417 int warn_uninitialized;
1419 /* Nonzero means warn about all declarations which shadow others. */
1423 /* Warn if a switch on an enum fails to have a case for every enum value. */
1427 /* Nonzero means warn about function definitions that default the return type
1428 or that use a null return and have a return-type other than void. */
1430 int warn_return_type;
1432 /* Nonzero means warn about pointer casts that increase the required
1433 alignment of the target type (and might therefore lead to a crash
1434 due to a misaligned access). */
1436 int warn_cast_align;
1438 /* Nonzero means warn about any objects definitions whose size is larger
1439 than N bytes. Also want about function definitions whose returned
1440 values are larger than N bytes. The value N is in `larger_than_size'. */
1442 int warn_larger_than;
1443 HOST_WIDE_INT larger_than_size;
1445 /* Nonzero means warn if inline function is too large. */
1449 /* Warn if a function returns an aggregate,
1450 since there are often incompatible calling conventions for doing this. */
1452 int warn_aggregate_return;
1454 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1458 /* Warn when gcc pads a structure to an alignment boundary. */
1462 /* Warn when an optimization pass is disabled. */
1464 int warn_disabled_optimization;
1466 /* Warn about functions which might be candidates for attribute noreturn. */
1468 int warn_missing_noreturn;
1470 /* Nonzero means warn about uses of __attribute__((deprecated))
1473 int warn_deprecated_decl = 1;
1475 /* Likewise for -W. */
1477 static const lang_independent_options W_options[] =
1479 {"unused-function", &warn_unused_function, 1,
1480 N_("Warn when a function is unused") },
1481 {"unused-label", &warn_unused_label, 1,
1482 N_("Warn when a label is unused") },
1483 {"unused-parameter", &warn_unused_parameter, 1,
1484 N_("Warn when a function parameter is unused") },
1485 {"unused-variable", &warn_unused_variable, 1,
1486 N_("Warn when a variable is unused") },
1487 {"unused-value", &warn_unused_value, 1,
1488 N_("Warn when an expression value is unused") },
1489 {"system-headers", &warn_system_headers, 1,
1490 N_("Do not suppress warnings from system headers") },
1491 {"error", &warnings_are_errors, 1,
1492 N_("Treat all warnings as errors") },
1493 {"shadow", &warn_shadow, 1,
1494 N_("Warn when one local variable shadows another") },
1495 {"switch", &warn_switch, 1,
1496 N_("Warn about enumerated switches missing a specific case") },
1497 {"aggregate-return", &warn_aggregate_return, 1,
1498 N_("Warn about returning structures, unions or arrays") },
1499 {"cast-align", &warn_cast_align, 1,
1500 N_("Warn about pointer casts which increase alignment") },
1501 {"unreachable-code", &warn_notreached, 1,
1502 N_("Warn about code that will never be executed") },
1503 {"uninitialized", &warn_uninitialized, 1,
1504 N_("Warn about uninitialized automatic variables") },
1505 {"inline", &warn_inline, 1,
1506 N_("Warn when an inlined function cannot be inlined") },
1507 {"packed", &warn_packed, 1,
1508 N_("Warn when the packed attribute has no effect on struct layout") },
1509 {"padded", &warn_padded, 1,
1510 N_("Warn when padding is required to align struct members") },
1511 {"disabled-optimization", &warn_disabled_optimization, 1,
1512 N_("Warn when an optimization pass is disabled") },
1513 {"deprecated-declarations", &warn_deprecated_decl, 1,
1514 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1515 {"missing-noreturn", &warn_missing_noreturn, 1,
1516 N_("Warn about functions which might be candidates for attribute noreturn") }
1520 set_Wunused (setting)
1523 warn_unused_function = setting;
1524 warn_unused_label = setting;
1525 /* Unused function parameter warnings are reported when either ``-W
1526 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1527 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1529 warn_unused_parameter = 0;
1530 else if (!warn_unused_parameter)
1531 warn_unused_parameter = -1;
1532 warn_unused_variable = setting;
1533 warn_unused_value = setting;
1536 /* The following routines are useful in setting all the flags that
1537 -ffast-math and -fno-fast-math imply. */
1540 set_fast_math_flags ()
1542 flag_trapping_math = 0;
1543 flag_unsafe_math_optimizations = 1;
1544 flag_errno_math = 0;
1548 set_no_fast_math_flags ()
1550 flag_trapping_math = 1;
1551 flag_unsafe_math_optimizations = 0;
1552 flag_errno_math = 1;
1556 /* Output files for assembler code (real compiler output)
1557 and debugging dumps. */
1560 FILE *aux_info_file;
1561 FILE *rtl_dump_file = NULL;
1563 /* Decode the string P as an integral parameter.
1564 If the string is indeed an integer return its numeric value else
1565 issue an Invalid Option error for the option PNAME and return DEFVAL.
1566 If PNAME is zero just return DEFVAL, do not call error. */
1569 read_integral_parameter (p, pname, defval)
1574 const char *endp = p;
1578 if (ISDIGIT (*endp))
1587 error ("invalid option `%s'", pname);
1595 /* This is the default decl_printable_name function. */
1598 decl_name (decl, verbosity)
1600 int verbosity ATTRIBUTE_UNUSED;
1602 return IDENTIFIER_POINTER (DECL_NAME (decl));
1606 /* This calls abort and is used to avoid problems when abort if a macro.
1607 It is used when we need to pass the address of abort. */
1615 /* When `malloc.c' is compiled with `rcheck' defined,
1616 it calls this function to report clobberage. */
1620 const char *s ATTRIBUTE_UNUSED;
1625 /* Return the logarithm of X, base 2, considering X unsigned,
1626 if X is a power of 2. Otherwise, returns -1.
1628 This should be used via the `exact_log2' macro. */
1632 unsigned HOST_WIDE_INT x;
1635 /* Test for 0 or a power of 2. */
1636 if (x == 0 || x != (x & -x))
1638 while ((x >>= 1) != 0)
1643 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1644 If X is 0, return -1.
1646 This should be used via the floor_log2 macro. */
1650 unsigned HOST_WIDE_INT x;
1659 static int float_handler_set;
1661 jmp_buf float_handler;
1663 /* Signals actually come here. */
1666 float_signal (signo)
1667 /* If this is missing, some compilers complain. */
1668 int signo ATTRIBUTE_UNUSED;
1670 if (float_handled == 0)
1671 crash_signal (signo);
1674 /* On System-V derived systems, we must reinstall the signal handler.
1675 This is harmless on BSD-derived systems. */
1676 signal (SIGFPE, float_signal);
1677 longjmp (float_handler, 1);
1680 /* Specify where to longjmp to when a floating arithmetic error happens.
1681 If HANDLER is 0, it means don't handle the errors any more. */
1684 set_float_handler (handler)
1687 float_handled = (handler != 0);
1689 memcpy (float_handler, handler, sizeof (float_handler));
1691 if (float_handled && ! float_handler_set)
1693 signal (SIGFPE, float_signal);
1694 float_handler_set = 1;
1698 /* This is a wrapper function for code which might elicit an
1699 arithmetic exception. That code should be passed in as a function
1700 pointer FN, and one argument DATA. DATA is usually a struct which
1701 contains the real input and output for function FN. This function
1702 returns 0 (failure) if longjmp was called (i.e. an exception
1703 occurred.) It returns 1 (success) otherwise. */
1706 do_float_handler (fn, data)
1707 void (*fn) PARAMS ((PTR));
1714 /* We got here via longjmp () caused by an exception in function
1716 set_float_handler (NULL);
1720 set_float_handler (buf);
1722 set_float_handler (NULL);
1726 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1727 into ICE messages, which is much more user friendly. */
1730 crash_signal (signo)
1733 internal_error ("internal error: %s", strsignal (signo));
1736 /* Strip off a legitimate source ending from the input string NAME of
1737 length LEN. Rather than having to know the names used by all of
1738 our front ends, we strip off an ending of a period followed by
1739 up to five characters. (Java uses ".class".) */
1742 strip_off_ending (name, len)
1747 for (i = 2; i < 6 && len > i; i++)
1749 if (name[len - i] == '.')
1751 name[len - i] = '\0';
1757 /* Output a quoted string. */
1760 output_quoted_string (asm_file, string)
1764 #ifdef OUTPUT_QUOTED_STRING
1765 OUTPUT_QUOTED_STRING (asm_file, string);
1769 putc ('\"', asm_file);
1770 while ((c = *string++) != 0)
1772 if (c == '\"' || c == '\\')
1773 putc ('\\', asm_file);
1776 putc ('\"', asm_file);
1780 /* Output a file name in the form wanted by System V. */
1783 output_file_directive (asm_file, input_name)
1785 const char *input_name;
1787 int len = strlen (input_name);
1788 const char *na = input_name + len;
1790 /* NA gets INPUT_NAME sans directory names. */
1791 while (na > input_name)
1793 if (IS_DIR_SEPARATOR (na[-1]))
1798 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1799 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1801 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1802 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1804 fprintf (asm_file, "\t.file\t");
1805 output_quoted_string (asm_file, na);
1806 fputc ('\n', asm_file);
1811 /* Routine to open a dump file. Return true if the dump file is enabled. */
1814 open_dump_file (index, decl)
1815 enum dump_file_index index;
1819 const char *open_arg;
1822 if (! dump_file[index].enabled)
1825 timevar_push (TV_DUMP);
1826 if (rtl_dump_file != NULL)
1827 fclose (rtl_dump_file);
1829 sprintf (seq, DUMPFILE_FORMAT, index);
1831 if (! dump_file[index].initialized)
1833 /* If we've not initialized the files, do so now. */
1834 if (graph_dump_format != no_graph
1835 && dump_file[index].graph_dump_p)
1837 dump_name = concat (seq, dump_file[index].extension, NULL);
1838 clean_graph_dump_file (dump_base_name, dump_name);
1841 dump_file[index].initialized = 1;
1847 dump_name = concat (dump_base_name, seq,
1848 dump_file[index].extension, NULL);
1850 rtl_dump_file = fopen (dump_name, open_arg);
1851 if (rtl_dump_file == NULL)
1852 fatal_io_error ("can't open %s", dump_name);
1857 fprintf (rtl_dump_file, "\n;; Function %s\n\n",
1858 decl_printable_name (decl, 2));
1860 timevar_pop (TV_DUMP);
1864 /* Routine to close a dump file. */
1867 close_dump_file (index, func, insns)
1868 enum dump_file_index index;
1869 void (*func) PARAMS ((FILE *, rtx));
1872 if (! rtl_dump_file)
1875 timevar_push (TV_DUMP);
1877 && graph_dump_format != no_graph
1878 && dump_file[index].graph_dump_p)
1883 sprintf (seq, DUMPFILE_FORMAT, index);
1884 suffix = concat (seq, dump_file[index].extension, NULL);
1885 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1890 func (rtl_dump_file, insns);
1892 fflush (rtl_dump_file);
1893 fclose (rtl_dump_file);
1895 rtl_dump_file = NULL;
1896 timevar_pop (TV_DUMP);
1899 /* Do any final processing required for the declarations in VEC, of
1900 which there are LEN. We write out inline functions and variables
1901 that have been deferred until this point, but which are required.
1902 Returns non-zero if anything was put out. */
1905 wrapup_global_declarations (vec, len)
1912 int output_something = 0;
1914 for (i = 0; i < len; i++)
1918 /* We're not deferring this any longer. */
1919 DECL_DEFER_OUTPUT (decl) = 0;
1921 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0
1922 && incomplete_decl_finalize_hook != 0)
1923 (*incomplete_decl_finalize_hook) (decl);
1926 /* Now emit any global variables or functions that we have been
1927 putting off. We need to loop in case one of the things emitted
1928 here references another one which comes earlier in the list. */
1932 for (i = 0; i < len; i++)
1936 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1939 /* Don't write out static consts, unless we still need them.
1941 We also keep static consts if not optimizing (for debugging),
1942 unless the user specified -fno-keep-static-consts.
1943 ??? They might be better written into the debug information.
1944 This is possible when using DWARF.
1946 A language processor that wants static constants to be always
1947 written out (even if it is not used) is responsible for
1948 calling rest_of_decl_compilation itself. E.g. the C front-end
1949 calls rest_of_decl_compilation from finish_decl.
1950 One motivation for this is that is conventional in some
1951 environments to write things like:
1952 static const char rcsid[] = "... version string ...";
1953 intending to force the string to be in the executable.
1955 A language processor that would prefer to have unneeded
1956 static constants "optimized away" would just defer writing
1957 them out until here. E.g. C++ does this, because static
1958 constants are often defined in header files.
1960 ??? A tempting alternative (for both C and C++) would be
1961 to force a constant to be written if and only if it is
1962 defined in a main file, as opposed to an include file. */
1964 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
1965 && (((! TREE_READONLY (decl) || TREE_PUBLIC (decl))
1966 && !DECL_COMDAT (decl))
1968 && flag_keep_static_consts
1969 && !DECL_ARTIFICIAL (decl))
1970 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1973 rest_of_decl_compilation (decl, NULL, 1, 1);
1976 if (TREE_CODE (decl) == FUNCTION_DECL
1977 && DECL_INITIAL (decl) != 0
1978 && DECL_SAVED_INSNS (decl) != 0
1979 && (flag_keep_inline_functions
1980 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1981 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1984 output_inline_function (decl);
1989 output_something = 1;
1993 return output_something;
1996 /* Issue appropriate warnings for the global declarations in VEC (of
1997 which there are LEN). Output debugging information for them. */
2000 check_global_declarations (vec, len)
2007 for (i = 0; i < len; i++)
2011 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
2012 && ! TREE_ASM_WRITTEN (decl))
2013 /* Cancel the RTL for this decl so that, if debugging info
2014 output for global variables is still to come,
2015 this one will be omitted. */
2016 SET_DECL_RTL (decl, NULL_RTX);
2018 /* Warn about any function
2019 declared static but not defined.
2020 We don't warn about variables,
2021 because many programs have static variables
2022 that exist only to get some text into the object file. */
2023 if (TREE_CODE (decl) == FUNCTION_DECL
2024 && (warn_unused_function
2025 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2026 && DECL_INITIAL (decl) == 0
2027 && DECL_EXTERNAL (decl)
2028 && ! DECL_ARTIFICIAL (decl)
2029 && ! TREE_PUBLIC (decl))
2031 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2032 pedwarn_with_decl (decl,
2033 "`%s' used but never defined");
2035 warning_with_decl (decl,
2036 "`%s' declared `static' but never defined");
2037 /* This symbol is effectively an "extern" declaration now. */
2038 TREE_PUBLIC (decl) = 1;
2039 assemble_external (decl);
2042 /* Warn about static fns or vars defined but not used,
2043 but not about inline functions or static consts
2044 since defining those in header files is normal practice. */
2045 if (((warn_unused_function
2046 && TREE_CODE (decl) == FUNCTION_DECL && ! DECL_INLINE (decl))
2047 || (warn_unused_variable
2048 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
2049 && ! DECL_IN_SYSTEM_HEADER (decl)
2050 && ! DECL_EXTERNAL (decl)
2051 && ! TREE_PUBLIC (decl)
2052 && ! TREE_USED (decl)
2053 && (TREE_CODE (decl) == FUNCTION_DECL || ! DECL_REGISTER (decl))
2054 /* The TREE_USED bit for file-scope decls
2055 is kept in the identifier, to handle multiple
2056 external decls in different scopes. */
2057 && ! TREE_USED (DECL_NAME (decl)))
2058 warning_with_decl (decl, "`%s' defined but not used");
2060 timevar_push (TV_SYMOUT);
2061 (*debug_hooks->global_decl) (decl);
2062 timevar_pop (TV_SYMOUT);
2066 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2067 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2068 INPUT_FILENAME and LINENO accordingly. */
2071 push_srcloc (file, line)
2075 struct file_stack *fs;
2077 if (input_file_stack)
2079 input_file_stack->name = input_filename;
2080 input_file_stack->line = lineno;
2083 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2084 fs->name = input_filename = file;
2085 fs->line = lineno = line;
2086 fs->indent_level = 0;
2087 fs->next = input_file_stack;
2088 input_file_stack = fs;
2089 input_file_stack_tick++;
2092 /* Pop the top entry off the stack of presently open source files.
2093 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2099 struct file_stack *fs;
2101 fs = input_file_stack;
2102 input_file_stack = fs->next;
2104 input_file_stack_tick++;
2105 /* The initial source file is never popped. */
2106 if (!input_file_stack)
2108 input_filename = input_file_stack->name;
2109 lineno = input_file_stack->line;
2112 /* Compile an entire translation unit. Write a file of assembly
2113 output and various debugging dumps. */
2120 /* Initialize yet another pass. */
2122 init_final (main_input_filename);
2123 init_branch_prob (dump_base_name);
2125 timevar_push (TV_PARSE);
2127 /* Call the parser, which parses the entire file
2128 (calling rest_of_compilation for each function). */
2131 /* In case there were missing block closers,
2132 get us back to the global binding level. */
2133 (*lang_hooks.clear_binding_stack) ();
2135 /* Compilation is now finished except for writing
2136 what's left of the symbol table output. */
2138 timevar_pop (TV_PARSE);
2140 if (flag_syntax_only)
2143 globals = getdecls ();
2145 /* Really define vars that have had only a tentative definition.
2146 Really output inline functions that must actually be callable
2147 and have not been output so far. */
2150 int len = list_length (globals);
2151 tree *vec = (tree *) xmalloc (sizeof (tree) * len);
2155 /* Process the decls in reverse order--earliest first.
2156 Put them into VEC from back to front, then take out from front. */
2158 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
2159 vec[len - i - 1] = decl;
2161 wrapup_global_declarations (vec, len);
2163 /* This must occur after the loop to output deferred functions. Else
2164 the profiler initializer would not be emitted if all the functions
2165 in this compilation unit were deferred.
2167 output_func_start_profiler can not cause any additional functions or
2168 data to need to be output, so it need not be in the deferred function
2170 output_func_start_profiler ();
2172 check_global_declarations (vec, len);
2178 /* Write out any pending weak symbol declarations. */
2182 /* Do dbx symbols. */
2183 timevar_push (TV_SYMOUT);
2185 #ifdef DWARF2_UNWIND_INFO
2186 if (dwarf2out_do_frame ())
2187 dwarf2out_frame_finish ();
2190 (*debug_hooks->finish) (main_input_filename);
2191 timevar_pop (TV_SYMOUT);
2193 /* Output some stuff at end of file if nec. */
2195 dw2_output_indirect_constants ();
2197 end_final (dump_base_name);
2199 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2201 timevar_push (TV_DUMP);
2202 open_dump_file (DFI_bp, NULL);
2206 close_dump_file (DFI_bp, NULL, NULL_RTX);
2207 timevar_pop (TV_DUMP);
2211 ASM_FILE_END (asm_out_file);
2214 /* Attach a special .ident directive to the end of the file to identify
2215 the version of GCC which compiled this code. The format of the .ident
2216 string is patterned after the ones produced by native SVR4 compilers. */
2219 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2220 IDENT_ASM_OP, version_string);
2223 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2225 timevar_push (TV_DUMP);
2226 dump_combine_total_stats (rtl_dump_file);
2227 close_dump_file (DFI_combine, NULL, NULL_RTX);
2228 timevar_pop (TV_DUMP);
2232 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2233 and TYPE_DECL nodes.
2235 This does nothing for local (non-static) variables, unless the
2236 variable is a register variable with an ASMSPEC. In that case, or
2237 if the variable is not an automatic, it sets up the RTL and
2238 outputs any assembler code (label definition, storage allocation
2239 and initialization).
2241 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2242 the assembler symbol name to be used. TOP_LEVEL is nonzero
2243 if this declaration is not within a function. */
2246 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2248 const char *asmspec;
2252 /* Declarations of variables, and of functions defined elsewhere. */
2254 /* The most obvious approach, to put an #ifndef around where
2255 this macro is used, doesn't work since it's inside a macro call. */
2256 #ifndef ASM_FINISH_DECLARE_OBJECT
2257 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2260 /* Forward declarations for nested functions are not "external",
2261 but we need to treat them as if they were. */
2262 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2263 || TREE_CODE (decl) == FUNCTION_DECL)
2265 timevar_push (TV_VARCONST);
2267 make_decl_rtl (decl, asmspec);
2268 /* Don't output anything
2269 when a tentative file-scope definition is seen.
2270 But at end of compilation, do output code for them. */
2271 if (at_end || !DECL_DEFER_OUTPUT (decl))
2272 assemble_variable (decl, top_level, at_end, 0);
2273 if (decl == last_assemble_variable_decl)
2275 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2278 timevar_pop (TV_VARCONST);
2280 else if (DECL_REGISTER (decl) && asmspec != 0)
2282 if (decode_reg_name (asmspec) >= 0)
2284 SET_DECL_RTL (decl, NULL_RTX);
2285 make_decl_rtl (decl, asmspec);
2289 error ("invalid register name `%s' for register variable", asmspec);
2290 DECL_REGISTER (decl) = 0;
2295 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2296 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2297 && TREE_CODE (decl) == TYPE_DECL)
2299 timevar_push (TV_SYMOUT);
2300 dbxout_symbol (decl, 0);
2301 timevar_pop (TV_SYMOUT);
2304 #ifdef SDB_DEBUGGING_INFO
2305 else if (write_symbols == SDB_DEBUG && top_level
2306 && TREE_CODE (decl) == TYPE_DECL)
2308 timevar_push (TV_SYMOUT);
2309 sdbout_symbol (decl, 0);
2310 timevar_pop (TV_SYMOUT);
2315 /* Called after finishing a record, union or enumeral type. */
2318 rest_of_type_compilation (type, toplev)
2319 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2323 tree type ATTRIBUTE_UNUSED;
2324 int toplev ATTRIBUTE_UNUSED;
2327 timevar_push (TV_SYMOUT);
2328 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2329 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2330 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2332 #ifdef SDB_DEBUGGING_INFO
2333 if (write_symbols == SDB_DEBUG)
2334 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2336 #ifdef DWARF2_DEBUGGING_INFO
2337 if ((write_symbols == DWARF2_DEBUG
2338 || write_symbols == VMS_AND_DWARF2_DEBUG)
2340 dwarf2out_decl (TYPE_STUB_DECL (type));
2342 timevar_pop (TV_SYMOUT);
2345 /* This is called from finish_function (within yyparse)
2346 after each top-level definition is parsed.
2347 It is supposed to compile that function or variable
2348 and output the assembler code for it.
2349 After we return, the tree storage is freed. */
2352 rest_of_compilation (decl)
2358 int rebuild_label_notes_after_reload;
2359 int register_life_up_to_date;
2361 timevar_push (TV_REST_OF_COMPILATION);
2363 /* Now that we're out of the frontend, we shouldn't have any more
2364 CONCATs anywhere. */
2365 generating_concat_p = 0;
2367 /* When processing delayed functions, prepare_function_start() won't
2368 have been run to re-initialize it. */
2369 cse_not_expected = ! optimize;
2371 /* First, make sure that NOTE_BLOCK is set correctly for each
2372 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2373 if (!cfun->x_whole_function_mode_p)
2376 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2377 tree in sensible shape. So, we just recalculate it here. */
2378 if (cfun->x_whole_function_mode_p)
2383 /* If we are reconsidering an inline function
2384 at the end of compilation, skip the stuff for making it inline. */
2386 if (DECL_SAVED_INSNS (decl) == 0)
2392 /* If this is nested inside an inlined external function, pretend
2393 it was only declared. Since we cannot inline such functions,
2394 generating code for this one is not only not necessary but will
2395 confuse some debugging output writers. */
2396 for (parent = DECL_CONTEXT (current_function_decl);
2397 parent != NULL_TREE;
2398 parent = get_containing_scope (parent))
2399 if (TREE_CODE (parent) == FUNCTION_DECL
2400 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2402 DECL_INITIAL (decl) = 0;
2403 goto exit_rest_of_compilation;
2406 /* If requested, consider whether to make this function inline. */
2407 if ((DECL_INLINE (decl) && !flag_no_inline)
2408 || flag_inline_functions)
2410 timevar_push (TV_INTEGRATION);
2411 lose = function_cannot_inline_p (decl);
2412 timevar_pop (TV_INTEGRATION);
2413 if (lose || ! optimize)
2415 if (warn_inline && DECL_INLINE (decl))
2416 warning_with_decl (decl, lose);
2417 DECL_ABSTRACT_ORIGIN (decl) = 0;
2418 /* Don't really compile an extern inline function.
2419 If we can't make it inline, pretend
2420 it was only declared. */
2421 if (DECL_EXTERNAL (decl))
2423 DECL_INITIAL (decl) = 0;
2424 goto exit_rest_of_compilation;
2428 /* ??? Note that this has the effect of making it look
2429 like "inline" was specified for a function if we choose
2430 to inline it. This isn't quite right, but it's
2431 probably not worth the trouble to fix. */
2432 inlinable = DECL_INLINE (decl) = 1;
2435 insns = get_insns ();
2437 /* Dump the rtl code if we are dumping rtl. */
2439 if (open_dump_file (DFI_rtl, decl))
2441 if (DECL_SAVED_INSNS (decl))
2442 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2443 close_dump_file (DFI_rtl, print_rtl, insns);
2446 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2447 sorts of eh initialization. Delay this until after the
2448 initial rtl dump so that we can see the original nesting. */
2449 convert_from_eh_region_ranges ();
2451 /* If function is inline, and we don't yet know whether to
2452 compile it by itself, defer decision till end of compilation.
2453 finish_compilation will call rest_of_compilation again
2454 for those functions that need to be output. Also defer those
2455 functions that we are supposed to defer. */
2458 || (DECL_INLINE (decl)
2459 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2460 && ! flag_keep_inline_functions)
2461 || DECL_EXTERNAL (decl))))
2462 DECL_DEFER_OUTPUT (decl) = 1;
2464 if (DECL_INLINE (decl))
2465 /* DWARF wants separate debugging info for abstract and
2466 concrete instances of all inline functions, including those
2467 declared inline but not inlined, and those inlined even
2468 though they weren't declared inline. Conveniently, that's
2469 what DECL_INLINE means at this point. */
2470 (*debug_hooks->deferred_inline_function) (decl);
2472 if (DECL_DEFER_OUTPUT (decl))
2474 /* If -Wreturn-type, we have to do a bit of compilation. We just
2475 want to call cleanup the cfg to figure out whether or not we can
2476 fall off the end of the function; we do the minimum amount of
2477 work necessary to make that safe. */
2478 if (warn_return_type)
2480 int saved_optimize = optimize;
2483 rebuild_jump_labels (insns);
2484 find_exception_handler_labels ();
2485 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2486 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2487 optimize = saved_optimize;
2489 /* CFG is no longer maintained up-to-date. */
2490 free_bb_for_insn ();
2493 current_function_nothrow = nothrow_function_p ();
2494 if (current_function_nothrow)
2495 /* Now we know that this can't throw; set the flag for the benefit
2496 of other functions later in this translation unit. */
2497 TREE_NOTHROW (current_function_decl) = 1;
2499 timevar_push (TV_INTEGRATION);
2500 save_for_inline (decl);
2501 timevar_pop (TV_INTEGRATION);
2502 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2503 goto exit_rest_of_compilation;
2506 /* If specified extern inline but we aren't inlining it, we are
2507 done. This goes for anything that gets here with DECL_EXTERNAL
2508 set, not just things with DECL_INLINE. */
2509 if (DECL_EXTERNAL (decl))
2510 goto exit_rest_of_compilation;
2513 /* If we're emitting a nested function, make sure its parent gets
2514 emitted as well. Doing otherwise confuses debug info. */
2517 for (parent = DECL_CONTEXT (current_function_decl);
2518 parent != NULL_TREE;
2519 parent = get_containing_scope (parent))
2520 if (TREE_CODE (parent) == FUNCTION_DECL)
2521 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2524 /* We are now committed to emitting code for this function. Do any
2525 preparation, such as emitting abstract debug info for the inline
2526 before it gets mangled by optimization. */
2527 if (DECL_INLINE (decl))
2528 (*debug_hooks->outlining_inline_function) (decl);
2530 /* Remove any notes we don't need. That will make iterating
2531 over the instruction sequence faster, and allow the garbage
2532 collector to reclaim the memory used by the notes. */
2533 remove_unnecessary_notes ();
2538 /* Initialize some variables used by the optimizers. */
2539 init_function_for_compilation ();
2541 if (! DECL_DEFER_OUTPUT (decl))
2542 TREE_ASM_WRITTEN (decl) = 1;
2544 /* Now that integrate will no longer see our rtl, we need not
2545 distinguish between the return value of this function and the
2546 return value of called functions. Also, we can remove all SETs
2547 of subregs of hard registers; they are only here because of
2548 integrate. Also, we can now initialize pseudos intended to
2549 carry magic hard reg data throughout the function. */
2550 rtx_equal_function_value_matters = 0;
2551 purge_hard_subreg_sets (get_insns ());
2552 emit_initial_value_sets ();
2554 /* Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2555 if ((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2556 goto exit_rest_of_compilation;
2558 /* We may have potential sibling or tail recursion sites. Select one
2559 (of possibly multiple) methods of performing the call. */
2560 if (flag_optimize_sibling_calls)
2562 timevar_push (TV_JUMP);
2563 open_dump_file (DFI_sibling, decl);
2565 optimize_sibling_and_tail_recursive_calls ();
2567 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2568 timevar_pop (TV_JUMP);
2571 /* Complete generation of exception handling code. */
2572 find_exception_handler_labels ();
2575 timevar_push (TV_JUMP);
2576 open_dump_file (DFI_eh, decl);
2578 finish_eh_generation ();
2580 close_dump_file (DFI_eh, print_rtl, get_insns ());
2581 timevar_pop (TV_JUMP);
2585 /* If we are doing position-independent code generation, now
2586 is the time to output special prologues and epilogues.
2587 We do not want to do this earlier, because it just clutters
2588 up inline functions with meaningless insns. */
2593 insns = get_insns ();
2595 /* Copy any shared structure that should not be shared. */
2596 unshare_all_rtl (current_function_decl, insns);
2598 #ifdef SETJMP_VIA_SAVE_AREA
2599 /* This must be performed before virtual register instantiation. */
2600 if (current_function_calls_alloca)
2601 optimize_save_area_alloca (insns);
2604 /* Instantiate all virtual registers. */
2605 instantiate_virtual_regs (current_function_decl, insns);
2607 open_dump_file (DFI_jump, decl);
2609 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2610 are initialized and to compute whether control can drop off the end
2613 timevar_push (TV_JUMP);
2614 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2615 before jump optimization switches branch directions. */
2616 expected_value_to_br_prob ();
2618 reg_scan (insns, max_reg_num (), 0);
2619 rebuild_jump_labels (insns);
2620 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2621 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP);
2623 /* CFG is no longer maintained up-to-date. */
2624 free_bb_for_insn ();
2625 copy_loop_headers (insns);
2626 purge_line_number_notes (insns);
2628 timevar_pop (TV_JUMP);
2630 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2631 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2633 close_dump_file (DFI_jump, print_rtl, insns);
2634 goto exit_rest_of_compilation;
2637 /* Long term, this should probably move before the jump optimizer too,
2638 but I didn't want to disturb the rtl_dump_and_exit and related
2639 stuff at this time. */
2640 if (optimize > 0 && flag_ssa)
2642 /* Convert to SSA form. */
2644 timevar_push (TV_TO_SSA);
2645 open_dump_file (DFI_ssa, decl);
2647 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2648 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2651 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2652 timevar_pop (TV_TO_SSA);
2654 /* Perform sparse conditional constant propagation, if requested. */
2657 timevar_push (TV_SSA_CCP);
2658 open_dump_file (DFI_ssa_ccp, decl);
2662 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2663 timevar_pop (TV_SSA_CCP);
2666 /* It would be useful to cleanup the CFG at this point, but block
2667 merging and possibly other transformations might leave a PHI
2668 node in the middle of a basic block, which is a strict no-no. */
2670 /* The SSA implementation uses basic block numbers in its phi
2671 nodes. Thus, changing the control-flow graph or the basic
2672 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2673 may cause problems. */
2677 /* Remove dead code. */
2679 timevar_push (TV_SSA_DCE);
2680 open_dump_file (DFI_ssa_dce, decl);
2682 insns = get_insns ();
2683 ssa_eliminate_dead_code();
2685 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2686 timevar_pop (TV_SSA_DCE);
2689 /* Convert from SSA form. */
2691 timevar_push (TV_FROM_SSA);
2692 open_dump_file (DFI_ussa, decl);
2694 convert_from_ssa ();
2695 /* New registers have been created. Rescan their usage. */
2696 reg_scan (insns, max_reg_num (), 1);
2698 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2699 timevar_pop (TV_FROM_SSA);
2702 /* CFG is no longer maintained up-to-date. */
2703 free_bb_for_insn ();
2706 timevar_push (TV_JUMP);
2710 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2711 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP
2712 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2714 /* ??? Run if-conversion before delete_null_pointer_checks,
2715 since the later does not preserve the CFG. This should
2716 be changed -- no since converting if's that are going to
2718 timevar_push (TV_IFCVT);
2720 timevar_pop (TV_IFCVT);
2722 /* CFG is no longer maintained up-to-date. */
2723 free_bb_for_insn ();
2724 /* Try to identify useless null pointer tests and delete them. */
2725 if (flag_delete_null_pointer_checks)
2726 delete_null_pointer_checks (insns);
2729 /* Jump optimization, and the removal of NULL pointer checks, may
2730 have reduced the number of instructions substantially. CSE, and
2731 future passes, allocate arrays whose dimensions involve the
2732 maximum instruction UID, so if we can reduce the maximum UID
2733 we'll save big on memory. */
2734 renumber_insns (rtl_dump_file);
2735 timevar_pop (TV_JUMP);
2737 close_dump_file (DFI_jump, print_rtl, insns);
2741 /* Perform common subexpression elimination.
2742 Nonzero value from `cse_main' means that jumps were simplified
2743 and some code may now be unreachable, so do
2744 jump optimization again. */
2748 open_dump_file (DFI_cse, decl);
2749 timevar_push (TV_CSE);
2751 reg_scan (insns, max_reg_num (), 1);
2753 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2755 /* If we are not running more CSE passes, then we are no longer
2756 expecting CSE to be run. But always rerun it in a cheap mode. */
2757 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2759 if (tem || optimize > 1)
2761 timevar_push (TV_JUMP);
2762 rebuild_jump_labels (insns);
2763 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2764 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2765 timevar_pop (TV_JUMP);
2766 /* CFG is no longer maintained up-to-date. */
2767 free_bb_for_insn ();
2770 /* Run this after jump optmizations remove all the unreachable code
2771 so that unreachable code will not keep values live. */
2772 delete_trivially_dead_insns (insns, max_reg_num (), 0);
2774 /* Try to identify useless null pointer tests and delete them. */
2775 if (flag_delete_null_pointer_checks || flag_thread_jumps)
2777 timevar_push (TV_JUMP);
2778 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2780 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP
2781 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2783 if (flag_delete_null_pointer_checks)
2784 delete_null_pointer_checks (insns);
2785 /* CFG is no longer maintained up-to-date. */
2786 free_bb_for_insn ();
2787 timevar_pop (TV_JUMP);
2790 /* The second pass of jump optimization is likely to have
2791 removed a bunch more instructions. */
2792 renumber_insns (rtl_dump_file);
2794 timevar_pop (TV_CSE);
2795 close_dump_file (DFI_cse, print_rtl, insns);
2798 open_dump_file (DFI_addressof, decl);
2800 purge_addressof (insns);
2801 reg_scan (insns, max_reg_num (), 1);
2803 close_dump_file (DFI_addressof, print_rtl, insns);
2807 /* Perform global cse. */
2809 if (optimize > 0 && flag_gcse)
2811 int save_csb, save_cfj;
2814 timevar_push (TV_GCSE);
2815 open_dump_file (DFI_gcse, decl);
2817 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2818 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2819 tem = gcse_main (insns, rtl_dump_file);
2820 rebuild_jump_labels (insns);
2822 save_csb = flag_cse_skip_blocks;
2823 save_cfj = flag_cse_follow_jumps;
2824 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2826 /* CFG is no longer maintained up-to-date. */
2827 free_bb_for_insn ();
2828 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2830 if (flag_expensive_optimizations)
2832 timevar_push (TV_CSE);
2833 reg_scan (insns, max_reg_num (), 1);
2834 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2835 timevar_pop (TV_CSE);
2836 cse_not_expected = !flag_rerun_cse_after_loop;
2839 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2840 things up. Then possibly re-run CSE again. */
2844 timevar_push (TV_JUMP);
2845 rebuild_jump_labels (insns);
2846 delete_trivially_dead_insns (insns, max_reg_num (), 0);
2847 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2848 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2849 /* CFG is no longer maintained up-to-date. */
2850 free_bb_for_insn ();
2851 timevar_pop (TV_JUMP);
2853 if (flag_expensive_optimizations)
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);
2862 close_dump_file (DFI_gcse, print_rtl, insns);
2863 timevar_pop (TV_GCSE);
2866 flag_cse_skip_blocks = save_csb;
2867 flag_cse_follow_jumps = save_cfj;
2870 /* Move constant computations out of loops. */
2874 timevar_push (TV_LOOP);
2875 open_dump_file (DFI_loop, decl);
2876 free_bb_for_insn ();
2878 if (flag_rerun_loop_opt)
2880 cleanup_barriers ();
2882 /* We only want to perform unrolling once. */
2884 loop_optimize (insns, rtl_dump_file, 0);
2886 /* The first call to loop_optimize makes some instructions
2887 trivially dead. We delete those instructions now in the
2888 hope that doing so will make the heuristics in loop work
2889 better and possibly speed up compilation. */
2890 delete_trivially_dead_insns (insns, max_reg_num (), 0);
2892 /* The regscan pass is currently necessary as the alias
2893 analysis code depends on this information. */
2894 reg_scan (insns, max_reg_num (), 1);
2896 cleanup_barriers ();
2897 loop_optimize (insns, rtl_dump_file,
2898 (flag_unroll_loops ? LOOP_UNROLL : 0) | LOOP_BCT
2899 | (flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0));
2901 close_dump_file (DFI_loop, print_rtl, insns);
2902 timevar_pop (TV_LOOP);
2909 timevar_push (TV_CSE2);
2910 open_dump_file (DFI_cse2, decl);
2912 if (flag_rerun_cse_after_loop)
2914 /* Running another jump optimization pass before the second
2915 cse pass sometimes simplifies the RTL enough to allow
2916 the second CSE pass to do a better job. Jump_optimize can change
2917 max_reg_num so we must rerun reg_scan afterwards.
2918 ??? Rework to not call reg_scan so often. */
2919 timevar_push (TV_JUMP);
2921 /* The previous call to loop_optimize makes some instructions
2922 trivially dead. We delete those instructions now in the
2923 hope that doing so will make the heuristics in jump work
2924 better and possibly speed up compilation. */
2925 delete_trivially_dead_insns (insns, max_reg_num (), 0);
2927 reg_scan (insns, max_reg_num (), 0);
2929 timevar_push (TV_IFCVT);
2931 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2932 cleanup_cfg (CLEANUP_EXPENSIVE);
2935 timevar_pop(TV_IFCVT);
2937 timevar_pop (TV_JUMP);
2939 /* CFG is no longer maintained up-to-date. */
2940 free_bb_for_insn ();
2941 reg_scan (insns, max_reg_num (), 0);
2942 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2946 timevar_push (TV_JUMP);
2947 rebuild_jump_labels (insns);
2948 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2949 cleanup_cfg (CLEANUP_EXPENSIVE);
2950 /* CFG is no longer maintained up-to-date. */
2951 free_bb_for_insn ();
2952 timevar_pop (TV_JUMP);
2956 close_dump_file (DFI_cse2, print_rtl, insns);
2957 timevar_pop (TV_CSE2);
2962 cse_not_expected = 1;
2966 /* Do control and data flow analysis; wrote some of the results to
2969 timevar_push (TV_FLOW);
2970 open_dump_file (DFI_cfg, decl);
2972 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2973 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0)
2974 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2975 check_function_return_warnings ();
2977 /* It may make more sense to mark constant functions after dead code is
2978 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2979 may insert code making function non-constant, but we still must consider
2980 it as constant, otherwise -fbranch-probabilities will not read data back.
2982 life_analyzis rarely eliminates modification of external memory.
2984 mark_constant_function ();
2986 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2988 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2990 timevar_push (TV_BRANCH_PROB);
2991 open_dump_file (DFI_bp, decl);
2995 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
2996 timevar_pop (TV_BRANCH_PROB);
2999 open_dump_file (DFI_life, decl);
3004 /* Discover and record the loop depth at the head of each basic
3005 block. The loop infrastructure does the real job for us. */
3006 flow_loops_find (&loops, LOOP_TREE);
3008 /* Estimate using heuristics if no profiling info is available. */
3009 if (flag_guess_branch_prob)
3010 estimate_probability (&loops);
3013 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
3015 flow_loops_free (&loops);
3017 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3018 timevar_pop (TV_FLOW);
3022 if (warn_uninitialized || extra_warnings)
3024 uninitialized_vars_warning (DECL_INITIAL (decl));
3026 setjmp_args_warning ();
3031 if (initialize_uninitialized_subregs ())
3033 /* Insns were inserted, so things might look a bit different. */
3034 insns = get_insns ();
3035 life_analysis (insns, rtl_dump_file,
3036 (PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES));
3040 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3044 /* If -opt, try combining insns through substitution. */
3048 int rebuild_jump_labels_after_combine = 0;
3050 timevar_push (TV_COMBINE);
3051 open_dump_file (DFI_combine, decl);
3053 rebuild_jump_labels_after_combine
3054 = combine_instructions (insns, max_reg_num ());
3056 /* Always purge dead edges, as we may eliminate an insn throwing
3058 rebuild_jump_labels_after_combine |= purge_all_dead_edges (true);
3060 /* Combining insns may have turned an indirect jump into a
3061 direct jump. Rebuid the JUMP_LABEL fields of jumping
3063 if (rebuild_jump_labels_after_combine)
3065 timevar_push (TV_JUMP);
3066 rebuild_jump_labels (insns);
3067 timevar_pop (TV_JUMP);
3069 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3072 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3073 timevar_pop (TV_COMBINE);
3078 /* Rerun if-conversion, as combine may have simplified things enough to
3079 now meet sequence length restrictions. */
3082 timevar_push (TV_IFCVT);
3083 open_dump_file (DFI_ce, decl);
3089 close_dump_file (DFI_ce, print_rtl_with_bb, insns);
3090 timevar_pop (TV_IFCVT);
3093 /* Register allocation pre-pass, to reduce number of moves
3094 necessary for two-address machines. */
3095 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3097 timevar_push (TV_REGMOVE);
3098 open_dump_file (DFI_regmove, decl);
3100 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3102 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3103 timevar_pop (TV_REGMOVE);
3108 /* Do unconditional splitting before register allocation to allow machine
3109 description to add extra information not needed previously. */
3110 split_all_insns (1);
3112 /* Any of the several passes since flow1 will have munged register
3113 lifetime data a bit. */
3114 register_life_up_to_date = 0;
3116 #ifdef OPTIMIZE_MODE_SWITCHING
3117 timevar_push (TV_MODE_SWITCH);
3120 if (optimize_mode_switching (NULL))
3122 /* We did work, and so had to regenerate global life information.
3123 Take advantage of this and don't re-recompute register life
3124 information below. */
3125 register_life_up_to_date = 1;
3129 timevar_pop (TV_MODE_SWITCH);
3132 timevar_push (TV_SCHED);
3134 #ifdef INSN_SCHEDULING
3136 /* Print function header into sched dump now
3137 because doing the sched analysis makes some of the dump. */
3138 if (optimize > 0 && flag_schedule_insns)
3140 open_dump_file (DFI_sched, decl);
3142 /* Do control and data sched analysis,
3143 and write some of the results to dump file. */
3145 schedule_insns (rtl_dump_file);
3147 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3149 /* Register lifetime information was updated as part of verifying
3151 register_life_up_to_date = 1;
3154 timevar_pop (TV_SCHED);
3158 /* Determine if the current function is a leaf before running reload
3159 since this can impact optimizations done by the prologue and
3160 epilogue thus changing register elimination offsets. */
3161 current_function_is_leaf = leaf_function_p ();
3163 timevar_push (TV_LOCAL_ALLOC);
3164 open_dump_file (DFI_lreg, decl);
3166 /* Allocate pseudo-regs that are used only within 1 basic block.
3168 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3169 jump optimizer after register allocation and reloading are finished. */
3171 if (! register_life_up_to_date)
3172 recompute_reg_usage (insns, ! optimize_size);
3174 /* Allocate the reg_renumber array. */
3175 allocate_reg_info (max_regno, FALSE, TRUE);
3177 /* And the reg_equiv_memory_loc array. */
3178 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3180 allocate_initial_values (reg_equiv_memory_loc);
3182 regclass (insns, max_reg_num (), rtl_dump_file);
3183 rebuild_label_notes_after_reload = local_alloc ();
3185 timevar_pop (TV_LOCAL_ALLOC);
3187 if (dump_file[DFI_lreg].enabled)
3189 timevar_push (TV_DUMP);
3191 dump_flow_info (rtl_dump_file);
3192 dump_local_alloc (rtl_dump_file);
3194 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3195 timevar_pop (TV_DUMP);
3200 timevar_push (TV_GLOBAL_ALLOC);
3201 open_dump_file (DFI_greg, decl);
3203 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3204 pass fixing up any insns that are invalid. */
3207 failure = global_alloc (rtl_dump_file);
3210 build_insn_chain (insns);
3211 failure = reload (insns, 0);
3214 timevar_pop (TV_GLOBAL_ALLOC);
3216 if (dump_file[DFI_greg].enabled)
3218 timevar_push (TV_DUMP);
3220 dump_global_regs (rtl_dump_file);
3222 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3223 timevar_pop (TV_DUMP);
3227 goto exit_rest_of_compilation;
3231 open_dump_file (DFI_postreload, decl);
3233 /* Do a very simple CSE pass over just the hard registers. */
3236 timevar_push (TV_RELOAD_CSE_REGS);
3237 reload_cse_regs (insns);
3238 timevar_pop (TV_RELOAD_CSE_REGS);
3241 /* Register allocation and reloading may have turned an indirect jump into
3242 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3243 jumping instructions. */
3244 if (rebuild_label_notes_after_reload)
3246 timevar_push (TV_JUMP);
3248 rebuild_jump_labels (insns);
3250 timevar_pop (TV_JUMP);
3253 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3255 /* Re-create the death notes which were deleted during reload. */
3256 timevar_push (TV_FLOW2);
3257 open_dump_file (DFI_flow2, decl);
3259 #ifdef ENABLE_CHECKING
3260 verify_flow_info ();
3263 /* If optimizing, then go ahead and split insns now. */
3265 split_all_insns (0);
3267 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
3269 /* On some machines, the prologue and epilogue code, or parts thereof,
3270 can be represented as RTL. Doing so lets us schedule insns between
3271 it and the rest of the code and also allows delayed branch
3272 scheduling to operate in the epilogue. */
3273 thread_prologue_and_epilogue_insns (insns);
3277 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_CROSSJUMP);
3278 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3280 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3281 even for machines with possibly nonzero RETURN_POPS_ARGS
3282 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3283 push instructions will have popping returns. */
3284 #ifndef PUSH_ROUNDING
3285 if (!ACCUMULATE_OUTGOING_ARGS)
3287 combine_stack_adjustments ();
3292 flow2_completed = 1;
3294 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3295 timevar_pop (TV_FLOW2);
3297 #ifdef HAVE_peephole2
3298 if (optimize > 0 && flag_peephole2)
3300 timevar_push (TV_PEEPHOLE2);
3301 open_dump_file (DFI_peephole2, decl);
3303 peephole2_optimize (rtl_dump_file);
3305 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3306 timevar_pop (TV_PEEPHOLE2);
3310 if (flag_rename_registers || flag_cprop_registers)
3312 timevar_push (TV_RENAME_REGISTERS);
3313 open_dump_file (DFI_rnreg, decl);
3315 if (flag_rename_registers)
3316 regrename_optimize ();
3317 if (flag_cprop_registers)
3318 copyprop_hardreg_forward ();
3320 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3321 timevar_pop (TV_RENAME_REGISTERS);
3326 timevar_push (TV_IFCVT2);
3327 open_dump_file (DFI_ce2, decl);
3331 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3332 timevar_pop (TV_IFCVT2);
3336 split_all_insns (1);
3339 #ifdef INSN_SCHEDULING
3340 if (optimize > 0 && flag_schedule_insns_after_reload)
3342 timevar_push (TV_SCHED2);
3343 open_dump_file (DFI_sched2, decl);
3345 /* Do control and data sched analysis again,
3346 and write some more of the results to dump file. */
3348 split_all_insns (1);
3350 schedule_insns (rtl_dump_file);
3352 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3353 timevar_pop (TV_SCHED2);
3359 #ifdef LEAF_REGISTERS
3360 current_function_uses_only_leaf_regs
3361 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3365 timevar_push (TV_REG_STACK);
3366 open_dump_file (DFI_stack, decl);
3368 reg_to_stack (insns, rtl_dump_file);
3370 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3371 timevar_pop (TV_REG_STACK);
3377 timevar_push (TV_REORDER_BLOCKS);
3378 open_dump_file (DFI_bbro, decl);
3380 /* Last attempt to optimize CFG, as life analyzis possibly removed
3381 some instructions. */
3382 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3383 | CLEANUP_CROSSJUMP);
3384 if (flag_reorder_blocks)
3386 reorder_basic_blocks ();
3387 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3390 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3391 timevar_pop (TV_REORDER_BLOCKS);
3393 compute_alignments ();
3395 /* CFG is no longer maintained up-to-date. */
3396 free_bb_for_insn ();
3398 /* If a machine dependent reorganization is needed, call it. */
3399 #ifdef MACHINE_DEPENDENT_REORG
3400 timevar_push (TV_MACH_DEP);
3401 open_dump_file (DFI_mach, decl);
3403 MACHINE_DEPENDENT_REORG (insns);
3405 close_dump_file (DFI_mach, print_rtl, insns);
3406 timevar_pop (TV_MACH_DEP);
3411 purge_line_number_notes (insns);
3412 cleanup_barriers ();
3414 /* If a scheduling pass for delayed branches is to be done,
3415 call the scheduling code. */
3418 if (optimize > 0 && flag_delayed_branch)
3420 timevar_push (TV_DBR_SCHED);
3421 open_dump_file (DFI_dbr, decl);
3423 dbr_schedule (insns, rtl_dump_file);
3425 close_dump_file (DFI_dbr, print_rtl, insns);
3426 timevar_pop (TV_DBR_SCHED);
3432 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3433 timevar_push (TV_SHORTEN_BRANCH);
3434 split_all_insns_noflow ();
3435 timevar_pop (TV_SHORTEN_BRANCH);
3438 convert_to_eh_region_ranges ();
3440 /* Shorten branches. */
3441 timevar_push (TV_SHORTEN_BRANCH);
3442 shorten_branches (get_insns ());
3443 timevar_pop (TV_SHORTEN_BRANCH);
3445 current_function_nothrow = nothrow_function_p ();
3446 if (current_function_nothrow)
3447 /* Now we know that this can't throw; set the flag for the benefit
3448 of other functions later in this translation unit. */
3449 TREE_NOTHROW (current_function_decl) = 1;
3451 /* Now turn the rtl into assembler code. */
3453 timevar_push (TV_FINAL);
3458 /* Get the function's name, as described by its RTL. This may be
3459 different from the DECL_NAME name used in the source file. */
3461 x = DECL_RTL (decl);
3462 if (GET_CODE (x) != MEM)
3465 if (GET_CODE (x) != SYMBOL_REF)
3467 fnname = XSTR (x, 0);
3469 assemble_start_function (decl, fnname);
3470 final_start_function (insns, asm_out_file, optimize);
3471 final (insns, asm_out_file, optimize, 0);
3472 final_end_function ();
3474 #ifdef IA64_UNWIND_INFO
3475 /* ??? The IA-64 ".handlerdata" directive must be issued before
3476 the ".endp" directive that closes the procedure descriptor. */
3477 output_function_exception_table ();
3480 assemble_end_function (decl, fnname);
3482 #ifndef IA64_UNWIND_INFO
3483 /* Otherwise, it feels unclean to switch sections in the middle. */
3484 output_function_exception_table ();
3488 fflush (asm_out_file);
3490 /* Release all memory allocated by flow. */
3491 free_basic_block_vars (0);
3493 /* Release all memory held by regsets now. */
3494 regset_release_memory ();
3496 timevar_pop (TV_FINAL);
3500 /* Write DBX symbols if requested. */
3502 /* Note that for those inline functions where we don't initially
3503 know for certain that we will be generating an out-of-line copy,
3504 the first invocation of this routine (rest_of_compilation) will
3505 skip over this code by doing a `goto exit_rest_of_compilation;'.
3506 Later on, finish_compilation will call rest_of_compilation again
3507 for those inline functions that need to have out-of-line copies
3508 generated. During that call, we *will* be routed past here. */
3510 timevar_push (TV_SYMOUT);
3511 (*debug_hooks->function_decl) (decl);
3512 timevar_pop (TV_SYMOUT);
3514 exit_rest_of_compilation:
3516 /* In case the function was not output,
3517 don't leave any temporary anonymous types
3518 queued up for sdb output. */
3519 #ifdef SDB_DEBUGGING_INFO
3520 if (write_symbols == SDB_DEBUG)
3521 sdbout_types (NULL_TREE);
3524 reload_completed = 0;
3525 flow2_completed = 0;
3528 timevar_push (TV_FINAL);
3530 /* Clear out the insn_length contents now that they are no
3532 init_insn_lengths ();
3534 /* Clear out the real_constant_chain before some of the rtx's
3535 it runs through become garbage. */
3536 clear_const_double_mem ();
3538 /* Show no temporary slots allocated. */
3541 free_basic_block_vars (0);
3542 free_bb_for_insn ();
3544 timevar_pop (TV_FINAL);
3546 /* Make sure volatile mem refs aren't considered valid operands for
3547 arithmetic insns. We must call this here if this is a nested inline
3548 function, since the above code leaves us in the init_recog state
3549 (from final.c), and the function context push/pop code does not
3550 save/restore volatile_ok.
3552 ??? Maybe it isn't necessary for expand_start_function to call this
3553 anymore if we do it here? */
3555 init_recog_no_volatile ();
3557 /* We're done with this function. Free up memory if we can. */
3558 free_after_parsing (cfun);
3559 if (! DECL_DEFER_OUTPUT (decl))
3561 free_after_compilation (cfun);
3563 /* Clear integrate.c's pointer to the cfun structure we just
3565 DECL_SAVED_INSNS (decl) = 0;
3571 timevar_pop (TV_REST_OF_COMPILATION);
3581 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3582 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3583 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3584 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3585 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3586 printf (_(" -fdiagnostics-show-location=[once | every-line] Indicates how often source location information should be emitted, as prefix, at the beginning of diagnostics when line-wrapping\n"));
3588 for (i = ARRAY_SIZE (f_options); i--;)
3590 const char *description = f_options[i].description;
3592 if (description != NULL && * description != 0)
3593 printf (" -f%-21s %s\n",
3594 f_options[i].string, _(description));
3597 printf (_(" -O[number] Set optimization level to [number]\n"));
3598 printf (_(" -Os Optimize for space rather than speed\n"));
3599 for (i = LAST_PARAM; i--;)
3601 const char *description = compiler_params[i].help;
3602 const int length = 21-strlen(compiler_params[i].option);
3604 if (description != NULL && * description != 0)
3605 printf (" --param %s=<value>%.*s%s\n",
3606 compiler_params[i].option,
3607 length > 0 ? length : 1, " ",
3610 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3611 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3612 printf (_(" -w Suppress warnings\n"));
3613 printf (_(" -W Enable extra warnings\n"));
3615 for (i = ARRAY_SIZE (W_options); i--;)
3617 const char *description = W_options[i].description;
3619 if (description != NULL && * description != 0)
3620 printf (" -W%-21s %s\n",
3621 W_options[i].string, _(description));
3624 printf (_(" -Wunused Enable unused warnings\n"));
3625 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3626 printf (_(" -p Enable function profiling\n"));
3627 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3628 printf (_(" -a Enable block profiling \n"));
3630 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3631 printf (_(" -ax Enable jump profiling \n"));
3633 printf (_(" -o <file> Place output into <file> \n"));
3635 -G <number> Put global and static data smaller than <number>\n\
3636 bytes into a special section (on some targets)\n"));
3638 for (i = ARRAY_SIZE (debug_args); i--;)
3640 if (debug_args[i].description != NULL)
3641 printf (" -g%-21s %s\n",
3642 debug_args[i].arg, _(debug_args[i].description));
3645 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3646 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3647 printf (_(" -version Display the compiler's version\n"));
3648 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3649 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3650 #if defined INSN_SCHEDULING
3651 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3653 printf (_(" --help Display this information\n"));
3658 /* Display descriptions of language specific options.
3659 If there is no description, note that there is an undocumented option.
3660 If the description is empty, do not display anything. (This allows
3661 options to be deliberately undocumented, for whatever reason).
3662 If the option string is missing, then this is a marker, indicating
3663 that the description string is in fact the name of a language, whose
3664 language specific options are to follow. */
3666 if (ARRAY_SIZE (documented_lang_options) > 1)
3668 printf (_("\nLanguage specific options:\n"));
3670 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3672 const char *description = documented_lang_options[i].description;
3673 const char *option = documented_lang_options[i].option;
3675 if (description == NULL)
3680 printf (_(" %-23.23s [undocumented]\n"), option);
3682 else if (*description == 0)
3684 else if (option == NULL)
3688 (_("\nThere are undocumented %s specific options as well.\n"),
3692 printf (_("\n Options for %s:\n"), description);
3697 printf (" %-23.23s %s\n", option, _(description));
3702 printf (_("\nThere are undocumented %s specific options as well.\n"),
3705 display_target_options ();
3709 display_target_options ()
3712 static bool displayed = false;
3714 /* Avoid double printing for --help --target-help. */
3719 if (ARRAY_SIZE (target_switches) > 1
3720 #ifdef TARGET_OPTIONS
3721 || ARRAY_SIZE (target_options) > 1
3729 printf (_("\nTarget specific options:\n"));
3731 for (i = ARRAY_SIZE (target_switches); i--;)
3733 const char *option = target_switches[i].name;
3734 const char *description = target_switches[i].description;
3736 if (option == NULL || *option == 0)
3738 else if (description == NULL)
3743 printf (_(" -m%-23.23s [undocumented]\n"), option);
3745 else if (* description != 0)
3746 doc += printf (" -m%-23.23s %s\n", option, _(description));
3749 #ifdef TARGET_OPTIONS
3750 for (i = ARRAY_SIZE (target_options); i--;)
3752 const char *option = target_options[i].prefix;
3753 const char *description = target_options[i].description;
3755 if (option == NULL || *option == 0)
3757 else if (description == NULL)
3762 printf (_(" -m%-23.23s [undocumented]\n"), option);
3764 else if (* description != 0)
3765 doc += printf (" -m%-23.23s %s\n", option, _(description));
3771 printf (_("\nThere are undocumented target specific options as well.\n"));
3773 printf (_(" They exist, but they are not documented.\n"));
3778 /* Parse a -d... command line switch. */
3781 decode_d_option (arg)
3790 for (i = 0; i < (int) DFI_MAX; ++i)
3791 dump_file[i].enabled = 1;
3797 flag_print_asm_name = 1;
3800 flag_dump_rtl_in_asm = 1;
3801 flag_print_asm_name = 1;
3804 graph_dump_format = vcg;
3807 rtl_dump_and_exit = 1;
3810 (*lang_hooks.set_yydebug) (1);
3812 case 'D': /* These are handled by the preprocessor. */
3818 for (i = 0; i < (int) DFI_MAX; ++i)
3819 if (c == dump_file[i].debug_switch)
3821 dump_file[i].enabled = 1;
3826 warning ("unrecognized gcc debugging option: %c", c);
3831 /* Parse a -f... command line switch. ARG is the value after the -f.
3832 It is safe to access 'ARG - 2' to generate the full switch name.
3833 Return the number of strings consumed. */
3836 decode_f_option (arg)
3840 const char *option_value = NULL;
3842 /* Search for the option in the table of binary f options. */
3843 for (j = ARRAY_SIZE (f_options); j--;)
3845 if (!strcmp (arg, f_options[j].string))
3847 *f_options[j].variable = f_options[j].on_value;
3851 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3852 && ! strcmp (arg + 3, f_options[j].string))
3854 *f_options[j].variable = ! f_options[j].on_value;
3859 if (!strcmp (arg, "fast-math"))
3860 set_fast_math_flags ();
3861 else if (!strcmp (arg, "no-fast-math"))
3862 set_no_fast_math_flags ();
3863 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
3864 || (option_value = skip_leading_substring (arg, "inline-limit=")))
3867 read_integral_parameter (option_value, arg - 2,
3869 set_param_value ("max-inline-insns", val);
3871 #ifdef INSN_SCHEDULING
3872 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
3873 fix_sched_param ("verbose", option_value);
3875 else if ((option_value = skip_leading_substring (arg, "fixed-")))
3876 fix_register (option_value, 1, 1);
3877 else if ((option_value = skip_leading_substring (arg, "call-used-")))
3878 fix_register (option_value, 0, 1);
3879 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
3880 fix_register (option_value, 0, 0);
3881 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
3882 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
3883 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
3885 = read_integral_parameter (option_value, arg - 2, align_functions);
3886 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
3887 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
3888 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
3890 = read_integral_parameter (option_value, arg - 2, align_labels);
3891 else if ((option_value
3892 = skip_leading_substring (arg, "stack-limit-register=")))
3894 int reg = decode_reg_name (option_value);
3896 error ("unrecognized register name `%s'", option_value);
3898 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
3900 else if ((option_value
3901 = skip_leading_substring (arg, "stack-limit-symbol=")))
3904 nm = ggc_strdup (option_value);
3905 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
3907 else if ((option_value
3908 = skip_leading_substring (arg, "message-length=")))
3909 output_set_maximum_length
3910 (&global_dc->buffer, read_integral_parameter
3911 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
3912 else if ((option_value
3913 = skip_leading_substring (arg, "diagnostics-show-location=")))
3915 if (!strcmp (option_value, "once"))
3916 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
3917 else if (!strcmp (option_value, "every-line"))
3918 diagnostic_prefixing_rule (global_dc)
3919 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
3921 error ("unrecognized option `%s'", arg - 2);
3923 else if (!strcmp (arg, "no-stack-limit"))
3924 stack_limit_rtx = NULL_RTX;
3925 else if (!strcmp (arg, "preprocessed"))
3926 /* Recognise this switch but do nothing. This prevents warnings
3927 about an unrecognized switch if cpplib has not been linked in. */
3935 /* Parse a -W... command line switch. ARG is the value after the -W.
3936 It is safe to access 'ARG - 2' to generate the full switch name.
3937 Return the number of strings consumed. */
3940 decode_W_option (arg)
3943 const char *option_value = NULL;
3946 /* Search for the option in the table of binary W options. */
3948 for (j = ARRAY_SIZE (W_options); j--;)
3950 if (!strcmp (arg, W_options[j].string))
3952 *W_options[j].variable = W_options[j].on_value;
3956 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3957 && ! strcmp (arg + 3, W_options[j].string))
3959 *W_options[j].variable = ! W_options[j].on_value;
3964 if ((option_value = skip_leading_substring (arg, "id-clash-")))
3965 warning ("-Wid-clash-LEN is no longer supported");
3966 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
3968 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
3970 warn_larger_than = larger_than_size != -1;
3972 else if (!strcmp (arg, "unused"))
3976 else if (!strcmp (arg, "no-unused"))
3986 /* Parse a -g... command line switch. ARG is the value after the -g.
3987 It is safe to access 'ARG - 2' to generate the full switch name.
3988 Return the number of strings consumed. */
3991 decode_g_option (arg)
3994 static unsigned level=0;
3995 /* A lot of code assumes write_symbols == NO_DEBUG if the
3996 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
3997 of what debugging type has been selected). This records the
3998 selected type. It is an error to specify more than one
4000 static enum debug_info_type selected_debug_type = NO_DEBUG;
4001 /* Non-zero if debugging format has been explicitly set.
4002 -g and -ggdb don't explicitly set the debugging format so
4003 -gdwarf -g3 is equivalent to -gdwarf3. */
4004 static int type_explicitly_set_p = 0;
4005 /* Indexed by enum debug_info_type. */
4006 static const char *const debug_type_names[] =
4008 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4011 /* The maximum admissible debug level value. */
4012 static const unsigned max_debug_level = 3;
4014 /* Look up ARG in the table. */
4015 for (da = debug_args; da->arg; da++)
4017 const int da_len = strlen (da->arg);
4019 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4021 enum debug_info_type type = da->debug_type;
4022 const char *p = arg + da_len;
4024 if (*p && ! ISDIGIT (*p))
4027 /* A debug flag without a level defaults to level 2.
4028 Note we do not want to call read_integral_parameter
4029 for that case since it will call atoi which
4032 ??? We may want to generalize the interface to
4033 read_integral_parameter to better handle this case
4034 if this case shows up often. */
4036 level = read_integral_parameter (p, 0, max_debug_level + 1);
4038 level = (level == 0) ? 2 : level;
4040 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4042 error ("use -gdwarf -g%d for DWARF v1, level %d",
4045 error ("use -gdwarf-2 for DWARF v2");
4048 if (level > max_debug_level)
4051 ignoring option `%s' due to invalid debug level specification",
4053 level = debug_info_level;
4056 if (type == NO_DEBUG)
4058 type = PREFERRED_DEBUGGING_TYPE;
4060 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4062 #if defined (DWARF2_DEBUGGING_INFO) && !defined (LINKER_DOES_NOT_WORK_WITH_DWARF2)
4063 type = DWARF2_DEBUG;
4065 #ifdef DBX_DEBUGGING_INFO
4072 if (type == NO_DEBUG)
4073 warning ("`%s': unknown or unsupported -g option", arg - 2);
4075 /* Does it conflict with an already selected type? */
4076 if (type_explicitly_set_p
4077 /* -g/-ggdb don't conflict with anything. */
4078 && da->debug_type != NO_DEBUG
4079 && type != selected_debug_type)
4080 warning ("`%s' ignored, conflicts with `-g%s'",
4081 arg - 2, debug_type_names[(int) selected_debug_type]);
4084 /* If the format has already been set, -g/-ggdb
4085 only change the debug level. */
4086 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4087 /* Don't change debugging type. */
4091 selected_debug_type = type;
4092 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4095 write_symbols = (level == 0
4097 : selected_debug_type);
4098 use_gnu_debug_info_extensions = da->use_extensions_p;
4099 debug_info_level = (enum debug_info_level) level;
4112 /* Decode the first argument in the argv as a language-independent option.
4113 Return the number of strings consumed. */
4116 independent_decode_option (argc, argv)
4120 char *arg = argv[0];
4122 if (arg[0] != '-' || arg[1] == 0)
4134 if (!strcmp (arg, "-help"))
4137 exit_after_options = 1;
4140 if (!strcmp (arg, "-target-help"))
4142 display_target_options ();
4143 exit_after_options = 1;
4146 if (!strcmp (arg, "-version"))
4148 print_version (stderr, "");
4149 exit_after_options = 1;
4152 /* Handle '--param <name>=<value>'. */
4153 if (strcmp (arg, "-param") == 0)
4159 error ("-param option missing argument");
4163 /* Get the '<name>=<value>' parameter. */
4165 /* Look for the `='. */
4166 equal = strchr (arg, '=');
4168 error ("invalid --param option: %s", arg);
4173 /* Zero out the `=' sign so that we get two separate strings. */
4175 /* Figure out what value is specified. */
4176 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4177 if (val != INVALID_PARAM_VAL)
4178 set_param_value (arg, val);
4180 error ("invalid parameter value `%s'", equal + 1);
4195 /* Already been treated in main (). Do nothing. */
4199 set_target_switch (arg + 1);
4203 return decode_f_option (arg + 1);
4206 return decode_g_option (arg + 1);
4209 if (!strcmp (arg, "dumpbase"))
4214 dump_base_name = argv[1];
4218 decode_d_option (arg + 1);
4222 if (!strcmp (arg, "pedantic"))
4224 else if (!strcmp (arg, "pedantic-errors"))
4225 flag_pedantic_errors = pedantic = 1;
4226 else if (arg[1] == 0)
4233 if (!strcmp (arg, "quiet"))
4240 if (!strcmp (arg, "version"))
4248 inhibit_warnings = 1;
4257 /* We save the value of warn_uninitialized, since if they put
4258 -Wuninitialized on the command line, we need to generate a
4259 warning about not using it without also specifying -O. */
4260 if (warn_uninitialized != 1)
4261 warn_uninitialized = 2;
4264 return decode_W_option (arg + 1);
4268 if (!strncmp (arg, "aux-info", 8))
4275 aux_info_file_name = argv[1];
4276 flag_gen_aux_info = 1;
4279 else if (arg[8] == '=')
4281 aux_info_file_name = arg + 9;
4282 flag_gen_aux_info = 1;
4297 asm_file_name = argv[1];
4312 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4317 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4321 if (g_switch_val == -1)
4325 g_switch_set = TRUE;
4326 g_switch_value = g_switch_val;
4336 /* Decode -m switches. */
4337 /* Decode the switch -mNAME. */
4340 set_target_switch (name)
4344 int valid_target_option = 0;
4346 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4347 if (!strcmp (target_switches[j].name, name))
4349 if (target_switches[j].value < 0)
4350 target_flags &= ~-target_switches[j].value;
4352 target_flags |= target_switches[j].value;
4353 valid_target_option = 1;
4356 #ifdef TARGET_OPTIONS
4357 if (!valid_target_option)
4358 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4360 int len = strlen (target_options[j].prefix);
4361 if (!strncmp (target_options[j].prefix, name, len))
4363 *target_options[j].variable = name + len;
4364 valid_target_option = 1;
4369 if (!valid_target_option)
4370 error ("invalid option `%s'", name);
4373 /* Print version information to FILE.
4374 Each line begins with INDENT (for the case where FILE is the
4375 assembler output file). */
4378 print_version (file, indent)
4383 #define __VERSION__ "[?]"
4387 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4389 "%s%s%s version %s (%s) compiled by CC.\n"
4391 , indent, *indent != 0 ? " " : "",
4392 lang_hooks.name, version_string, TARGET_NAME,
4393 indent, __VERSION__);
4396 /* Print an option value and return the adjusted position in the line.
4397 ??? We don't handle error returns from fprintf (disk full); presumably
4398 other code will catch a disk full though. */
4401 print_single_switch (file, pos, max, indent, sep, term, type, name)
4404 const char *indent, *sep, *term, *type, *name;
4406 /* The ultrix fprintf returns 0 on success, so compute the result we want
4407 here since we need it for the following test. */
4408 int len = strlen (sep) + strlen (type) + strlen (name);
4413 fprintf (file, "%s", term);
4418 fprintf (file, "%s", indent);
4419 pos = strlen (indent);
4421 fprintf (file, "%s%s%s", sep, type, name);
4426 /* Print active target switches to FILE.
4427 POS is the current cursor position and MAX is the size of a "line".
4428 Each line begins with INDENT and ends with TERM.
4429 Each switch is separated from the next by SEP. */
4432 print_switch_values (file, pos, max, indent, sep, term)
4435 const char *indent, *sep, *term;
4440 /* Print the options as passed. */
4442 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4443 _("options passed: "), "");
4445 for (p = &save_argv[1]; *p != NULL; p++)
4449 if (strcmp (*p, "-o") == 0)
4455 if (strcmp (*p, "-quiet") == 0)
4457 if (strcmp (*p, "-version") == 0)
4462 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4465 fprintf (file, "%s", term);
4467 /* Print the -f and -m options that have been enabled.
4468 We don't handle language specific options but printing argv
4471 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4472 _("options enabled: "), "");
4474 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4475 if (*f_options[j].variable == f_options[j].on_value)
4476 pos = print_single_switch (file, pos, max, indent, sep, term,
4477 "-f", f_options[j].string);
4479 /* Print target specific options. */
4481 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4482 if (target_switches[j].name[0] != '\0'
4483 && target_switches[j].value > 0
4484 && ((target_switches[j].value & target_flags)
4485 == target_switches[j].value))
4487 pos = print_single_switch (file, pos, max, indent, sep, term,
4488 "-m", target_switches[j].name);
4491 #ifdef TARGET_OPTIONS
4492 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4493 if (*target_options[j].variable != NULL)
4496 sprintf (prefix, "-m%s", target_options[j].prefix);
4497 pos = print_single_switch (file, pos, max, indent, sep, term,
4498 prefix, *target_options[j].variable);
4502 fprintf (file, "%s", term);
4505 /* Open assembly code output file. Do this even if -fsyntax-only is
4506 on, because then the driver will have provided the name of a
4507 temporary file or bit bucket for us. NAME is the file specified on
4508 the command line, possibly NULL. */
4510 init_asm_output (name)
4513 if (name == NULL && asm_file_name == 0)
4514 asm_out_file = stdout;
4517 if (asm_file_name == 0)
4519 int len = strlen (dump_base_name);
4520 char *dumpname = (char *) xmalloc (len + 6);
4521 memcpy (dumpname, dump_base_name, len + 1);
4522 strip_off_ending (dumpname, len);
4523 strcat (dumpname, ".s");
4524 asm_file_name = dumpname;
4526 if (!strcmp (asm_file_name, "-"))
4527 asm_out_file = stdout;
4529 asm_out_file = fopen (asm_file_name, "w");
4530 if (asm_out_file == 0)
4531 fatal_io_error ("can't open %s for writing", asm_file_name);
4534 #ifdef IO_BUFFER_SIZE
4535 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4536 _IOFBF, IO_BUFFER_SIZE);
4539 if (!flag_syntax_only)
4541 #ifdef ASM_FILE_START
4542 ASM_FILE_START (asm_out_file);
4545 #ifdef ASM_COMMENT_START
4546 if (flag_verbose_asm)
4548 /* Print the list of options in effect. */
4549 print_version (asm_out_file, ASM_COMMENT_START);
4550 print_switch_values (asm_out_file, 0, MAX_LINE,
4551 ASM_COMMENT_START, " ", "\n");
4552 /* Add a blank line here so it appears in assembler output but not
4554 fprintf (asm_out_file, "\n");
4560 /* Initialization of the front end environment, before command line
4561 options are parsed. Signal handlers, internationalization etc.
4562 ARGV0 is main's argv[0]. */
4564 general_init (argv0)
4569 p = argv0 + strlen (argv0);
4570 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4574 xmalloc_set_program_name (progname);
4576 gcc_init_libintl ();
4578 /* Install handler for SIGFPE, which may be received while we do
4579 compile-time floating point arithmetic. */
4580 signal (SIGFPE, float_signal);
4582 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4584 signal (SIGSEGV, crash_signal);
4587 signal (SIGILL, crash_signal);
4590 signal (SIGBUS, crash_signal);
4593 signal (SIGABRT, crash_signal);
4595 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4596 signal (SIGIOT, crash_signal);
4599 /* Initialize the diagnostics reporting machinery, so option parsing
4600 can give warnings and errors. */
4601 diagnostic_initialize (global_dc);
4604 /* Parse command line options and set default flag values, called
4605 after language-independent option-independent initialization. Do
4606 minimal options processing. Outputting diagnostics is OK, but GC
4607 and identifier hashtables etc. are not initialized yet. */
4609 parse_options_and_default_flags (argc, argv)
4615 /* Save in case md file wants to emit args as a comment. */
4619 /* Initialize register usage now so switches may override. */
4622 /* Register the language-independent parameters. */
4623 add_params (lang_independent_params, LAST_PARAM);
4625 /* Perform language-specific options initialization. */
4626 (*lang_hooks.init_options) ();
4628 /* Scan to see what optimization level has been specified. That will
4629 determine the default value of many flags. */
4630 for (i = 1; i < argc; i++)
4632 if (!strcmp (argv[i], "-O"))
4637 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4639 /* Handle -Os, -O2, -O3, -O69, ... */
4640 char *p = &argv[i][2];
4642 if ((p[0] == 's') && (p[1] == 0))
4646 /* Optimizing for size forces optimize to be 2. */
4651 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4652 if (optimize_val != -1)
4654 optimize = optimize_val;
4656 #ifdef FORCE_OPTIMIZATION_DOWNGRADE
4657 #warning FORCE_OPTIMIZATION_DOWNGRADE
4658 if (optimize > FORCE_OPTIMIZATION_DOWNGRADE)
4660 optimize = FORCE_OPTIMIZATION_DOWNGRADE;
4661 warning ("\n***\n***\t-O%d converted to \"-O%d\" due to optimizer bugs on this platform\n***\n",
4663 FORCE_OPTIMIZATION_DOWNGRADE);
4666 #endif /*FORCE_OPTIMIZATION_DOWNGRADE*/
4668 #if defined(__alpha__)
4671 warning ("\n***\n***\tThe -O%d flag TRIGGERS KNOWN OPTIMIZER BUGS ON THIS PLATFORM\n***\n",
4674 #endif /*__alpha__*/
4684 flag_merge_constants = 0;
4690 flag_thread_jumps = 1;
4692 flag_delayed_branch = 1;
4694 #ifdef CAN_DEBUG_WITHOUT_FP
4695 flag_omit_frame_pointer = 1;
4697 flag_guess_branch_prob = 1;
4698 flag_cprop_registers = 1;
4703 flag_optimize_sibling_calls = 1;
4704 flag_cse_follow_jumps = 1;
4705 flag_cse_skip_blocks = 1;
4707 flag_expensive_optimizations = 1;
4708 flag_strength_reduce = 1;
4709 flag_rerun_cse_after_loop = 1;
4710 flag_rerun_loop_opt = 1;
4711 flag_caller_saves = 1;
4714 #ifdef INSN_SCHEDULING
4715 flag_schedule_insns = 1;
4716 flag_schedule_insns_after_reload = 1;
4719 flag_strict_aliasing = 1;
4720 flag_delete_null_pointer_checks = 1;
4721 flag_reorder_blocks = 1;
4726 flag_inline_functions = 1;
4727 flag_rename_registers = 1;
4730 if (optimize < 2 || optimize_size)
4735 align_functions = 1;
4738 /* Initialize whether `char' is signed. */
4739 flag_signed_char = DEFAULT_SIGNED_CHAR;
4740 #ifdef DEFAULT_SHORT_ENUMS
4741 /* Initialize how much space enums occupy, by default. */
4742 flag_short_enums = DEFAULT_SHORT_ENUMS;
4745 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4748 set_target_switch ("");
4750 /* Unwind tables are always present in an ABI-conformant IA-64
4751 object file, so the default should be ON. */
4752 #ifdef IA64_UNWIND_INFO
4753 flag_unwind_tables = IA64_UNWIND_INFO;
4756 #ifdef OPTIMIZATION_OPTIONS
4757 /* Allow default optimizations to be specified on a per-machine basis. */
4758 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4761 /* Perform normal command line switch decoding. */
4762 for (i = 1; i < argc;)
4765 int indep_processed;
4767 /* Give the language a chance to decode the option for itself. */
4768 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
4770 if (lang_processed >= 0)
4771 /* Now see if the option also has a language independent meaning.
4772 Some options are both language specific and language independent,
4774 indep_processed = independent_decode_option (argc - i, argv + i);
4777 lang_processed = -lang_processed;
4778 indep_processed = 0;
4781 if (lang_processed || indep_processed)
4782 i += MAX (lang_processed, indep_processed);
4785 const char *option = NULL;
4786 const char *lang = NULL;
4789 /* It is possible that the command line switch is not valid for the
4790 current language, but it is valid for another language. In order
4791 to be compatible with previous versions of the compiler (which
4792 did not issue an error message in this case) we check for this
4793 possibility here. If we do find a match, then if extra_warnings
4794 is set we generate a warning message, otherwise we will just
4795 ignore the option. */
4796 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
4798 option = documented_lang_options[j].option;
4801 lang = documented_lang_options[j].description;
4802 else if (! strncmp (argv[i], option, strlen (option)))
4806 if (j != ARRAY_SIZE (documented_lang_options))
4810 warning ("ignoring command line option '%s'", argv[i]);
4813 ("(it is valid for %s but not the selected language)",
4817 else if (argv[i][0] == '-' && argv[i][1] == 'g')
4818 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
4820 error ("unrecognized option `%s'", argv[i]);
4826 /* Set flag_no_inline before the post_options () hook. The C front
4827 ends use it to determine tree inlining defaults. FIXME: such
4828 code should be lang-independent when all front ends use tree
4829 inlining, in which case it, and this condition, should be moved
4830 to the top of process_options() instead. */
4833 /* Inlining does not work if not optimizing,
4834 so force it not to be done. */
4838 /* The c_decode_option function and decode_option hook set
4839 this to `2' if -Wall is used, so we can avoid giving out
4840 lots of errors for people who don't realize what -Wall does. */
4841 if (warn_uninitialized == 1)
4842 warning ("-Wuninitialized is not supported without -O");
4845 /* All command line options have been parsed; allow the front end to
4846 perform consistency checks, etc. */
4847 (*lang_hooks.post_options) ();
4850 /* Process the options that have been parsed. */
4854 #ifdef OVERRIDE_OPTIONS
4855 /* Some machines may reject certain combinations of options. */
4859 /* Set up the align_*_log variables, defaulting them to 1 if they
4860 were still unset. */
4861 if (align_loops <= 0) align_loops = 1;
4862 if (align_loops_max_skip > align_loops || !align_loops)
4863 align_loops_max_skip = align_loops - 1;
4864 align_loops_log = floor_log2 (align_loops * 2 - 1);
4865 if (align_jumps <= 0) align_jumps = 1;
4866 if (align_jumps_max_skip > align_jumps || !align_jumps)
4867 align_jumps_max_skip = align_jumps - 1;
4868 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4869 if (align_labels <= 0) align_labels = 1;
4870 align_labels_log = floor_log2 (align_labels * 2 - 1);
4871 if (align_labels_max_skip > align_labels || !align_labels)
4872 align_labels_max_skip = align_labels - 1;
4873 if (align_functions <= 0) align_functions = 1;
4874 align_functions_log = floor_log2 (align_functions * 2 - 1);
4876 /* Unrolling all loops implies that standard loop unrolling must also
4878 if (flag_unroll_all_loops)
4879 flag_unroll_loops = 1;
4880 /* Loop unrolling requires that strength_reduction be on also. Silently
4881 turn on strength reduction here if it isn't already on. Also, the loop
4882 unrolling code assumes that cse will be run after loop, so that must
4883 be turned on also. */
4884 if (flag_unroll_loops)
4886 flag_strength_reduce = 1;
4887 flag_rerun_cse_after_loop = 1;
4890 if (flag_non_call_exceptions)
4891 flag_asynchronous_unwind_tables = 1;
4892 if (flag_asynchronous_unwind_tables)
4893 flag_unwind_tables = 1;
4895 /* Warn about options that are not supported on this machine. */
4896 #ifndef INSN_SCHEDULING
4897 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4898 warning ("instruction scheduling not supported on this target machine");
4901 if (flag_delayed_branch)
4902 warning ("this target machine does not have delayed branches");
4905 /* Some operating systems do not allow profiling without a frame
4907 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4909 && flag_omit_frame_pointer)
4911 error ("profiling does not work without a frame pointer");
4912 flag_omit_frame_pointer = 0;
4915 user_label_prefix = USER_LABEL_PREFIX;
4916 if (flag_leading_underscore != -1)
4918 /* If the default prefix is more complicated than "" or "_",
4919 issue a warning and ignore this option. */
4920 if (user_label_prefix[0] == 0 ||
4921 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4923 user_label_prefix = flag_leading_underscore ? "_" : "";
4926 warning ("-f%sleading-underscore not supported on this target machine",
4927 flag_leading_underscore ? "" : "no-");
4930 /* If we are in verbose mode, write out the version and maybe all the
4931 option flags in use. */
4934 print_version (stderr, "");
4936 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4942 if (flag_syntax_only)
4944 write_symbols = NO_DEBUG;
4948 /* Now we know write_symbols, set up the debug hooks based on it.
4949 By default we do nothing for debug output. */
4950 #if defined(DBX_DEBUGGING_INFO)
4951 if (write_symbols == DBX_DEBUG)
4952 debug_hooks = &dbx_debug_hooks;
4954 #if defined(XCOFF_DEBUGGING_INFO)
4955 if (write_symbols == XCOFF_DEBUG)
4956 debug_hooks = &xcoff_debug_hooks;
4958 #ifdef SDB_DEBUGGING_INFO
4959 if (write_symbols == SDB_DEBUG)
4960 debug_hooks = &sdb_debug_hooks;
4962 #ifdef DWARF_DEBUGGING_INFO
4963 if (write_symbols == DWARF_DEBUG)
4964 debug_hooks = &dwarf_debug_hooks;
4966 #ifdef DWARF2_DEBUGGING_INFO
4967 if (write_symbols == DWARF2_DEBUG)
4968 debug_hooks = &dwarf2_debug_hooks;
4970 #ifdef VMS_DEBUGGING_INFO
4971 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4972 debug_hooks = &vmsdbg_debug_hooks;
4975 /* If auxiliary info generation is desired, open the output file.
4976 This goes in the same directory as the source file--unlike
4977 all the other output files. */
4978 if (flag_gen_aux_info)
4980 aux_info_file = fopen (aux_info_file_name, "w");
4981 if (aux_info_file == 0)
4982 fatal_io_error ("can't open %s", aux_info_file_name);
4985 if (! targetm.have_named_sections)
4987 if (flag_function_sections)
4989 warning ("-ffunction-sections not supported for this target");
4990 flag_function_sections = 0;
4992 if (flag_data_sections)
4994 warning ("-fdata-sections not supported for this target");
4995 flag_data_sections = 0;
4999 if (flag_function_sections && profile_flag)
5001 warning ("-ffunction-sections disabled; it makes profiling impossible");
5002 flag_function_sections = 0;
5005 #ifndef HAVE_prefetch
5006 if (flag_prefetch_loop_arrays)
5008 warning ("-fprefetch-loop-arrays not supported for this target");
5009 flag_prefetch_loop_arrays = 0;
5012 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
5014 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
5015 flag_prefetch_loop_arrays = 0;
5019 /* This combination of options isn't handled for i386 targets and doesn't
5020 make much sense anyway, so don't allow it. */
5021 if (flag_prefetch_loop_arrays && optimize_size)
5023 warning ("-fprefetch-loop-arrays is not supported with -Os");
5024 flag_prefetch_loop_arrays = 0;
5027 #ifndef OBJECT_FORMAT_ELF
5028 if (flag_function_sections && write_symbols != NO_DEBUG)
5029 warning ("-ffunction-sections may affect debugging on some targets");
5033 /* Language-independent initialization, before language-dependent
5036 lang_independent_init ()
5038 decl_printable_name = decl_name;
5039 lang_expand_expr = (lang_expand_expr_t) do_abort;
5041 /* Set the language-dependent identifier size. */
5042 tree_code_length[(int) IDENTIFIER_NODE]
5043 = ((lang_hooks.identifier_size - sizeof (struct tree_common)
5044 + sizeof (tree) - 1) / sizeof (tree));
5046 /* Initialize the garbage-collector, and string pools. */
5048 ggc_add_rtx_root (&stack_limit_rtx, 1);
5049 ggc_add_tree_root (¤t_function_decl, 1);
5050 ggc_add_tree_root (¤t_function_func_begin_label, 1);
5055 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
5056 || debug_info_level == DINFO_LEVEL_VERBOSE
5057 #ifdef VMS_DEBUGGING_INFO
5058 /* Enable line number info for traceback */
5059 || debug_info_level > DINFO_LEVEL_NONE
5061 || flag_test_coverage
5062 || warn_notreached);
5068 init_function_once ();
5069 init_stor_layout_once ();
5070 init_varasm_once ();
5071 init_EXPR_INSN_LIST_cache ();
5073 /* The following initialization functions need to generate rtl, so
5074 provide a dummy function context for them. */
5075 init_dummy_function_start ();
5078 if (flag_caller_saves)
5079 init_caller_save ();
5080 expand_dummy_function_end ();
5083 /* Language-dependent initialization. Returns non-zero on success. */
5085 lang_dependent_init (name)
5088 if (dump_base_name == 0)
5089 dump_base_name = name ? name : "gccdump";
5091 /* Front-end initialization. This hook can assume that GC,
5092 identifier hashes etc. are set up, but debug initialization is
5093 not done yet. This routine must return the original filename
5094 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5095 name = (*lang_hooks.init) (name);
5099 /* Is this duplication necessary? */
5100 name = ggc_strdup (name);
5101 main_input_filename = input_filename = name;
5102 init_asm_output (name);
5104 /* These create various _DECL nodes, so need to be called after the
5105 front end is initialized. */
5109 /* Put an entry on the input file stack for the main input file. */
5110 push_srcloc (input_filename, 0);
5112 /* If dbx symbol table desired, initialize writing it and output the
5113 predefined types. */
5114 timevar_push (TV_SYMOUT);
5116 #ifdef DWARF2_UNWIND_INFO
5117 if (dwarf2out_do_frame ())
5118 dwarf2out_frame_init ();
5121 /* Now we have the correct original filename, we can initialize
5123 (*debug_hooks->init) (name);
5125 timevar_pop (TV_SYMOUT);
5130 /* Clean up: close opened files, etc. */
5135 /* Close the dump files. */
5136 if (flag_gen_aux_info)
5138 fclose (aux_info_file);
5140 unlink (aux_info_file_name);
5143 /* Close non-debugging input and output files. Take special care to note
5144 whether fclose returns an error, since the pages might still be on the
5145 buffer chain while the file is open. */
5149 if (ferror (asm_out_file) != 0)
5150 fatal_io_error ("error writing to %s", asm_file_name);
5151 if (fclose (asm_out_file) != 0)
5152 fatal_io_error ("error closing %s", asm_file_name);
5155 /* Do whatever is necessary to finish printing the graphs. */
5156 if (graph_dump_format != no_graph)
5160 for (i = 0; i < (int) DFI_MAX; ++i)
5161 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5166 sprintf (seq, DUMPFILE_FORMAT, i);
5167 suffix = concat (seq, dump_file[i].extension, NULL);
5168 finish_graph_dump_file (dump_base_name, suffix);
5175 ggc_print_statistics ();
5176 stringpool_statistics ();
5177 dump_tree_statistics ();
5180 /* Free up memory for the benefit of leak detectors. */
5183 /* Language-specific end of compilation actions. */
5184 (*lang_hooks.finish) ();
5187 /* Initialize the compiler, and compile the input file. */
5191 /* The bulk of command line switch processing. */
5194 /* We cannot start timing until after options are processed since that
5195 says if we run timers or not. */
5197 timevar_start (TV_TOTAL);
5199 /* Language-independent initialization. Also sets up GC, identifier
5201 lang_independent_init ();
5203 /* Language-dependent initialization. Returns true on success. */
5204 if (lang_dependent_init (filename))
5209 /* Stop timing and print the times. */
5210 timevar_stop (TV_TOTAL);
5211 timevar_print (stderr);
5214 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5215 Decode command args, then call compile_file.
5216 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5217 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5219 It is not safe to call this function more than once. */
5222 toplev_main (argc, argv)
5228 /* Initialization of GCC's environment, and diagnostics. */
5229 general_init (argv [0]);
5231 /* Parse the options and do minimal processing; basically just
5232 enough to default flags appropriately. */
5233 parse_options_and_default_flags (argc, argv);
5235 /* Exit early if we can (e.g. -help). */
5236 if (!exit_after_options)
5239 if (errorcount || sorrycount)
5240 return (FATAL_EXIT_CODE);
5242 return (SUCCESS_EXIT_CODE);