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. */
97 /* Carry information from ASM_DECLARE_OBJECT_NAME
98 to ASM_FINISH_DECLARE_OBJECT. */
100 extern int size_directive_output;
101 extern tree last_assemble_variable_decl;
103 static void general_init PARAMS ((char *));
104 static void parse_options_and_default_flags PARAMS ((int, char **));
105 static void do_compile PARAMS ((void));
106 static void process_options PARAMS ((void));
107 static void lang_independent_init PARAMS ((void));
108 static int lang_dependent_init PARAMS ((const char *));
109 static void init_asm_output PARAMS ((const char *));
110 static void finalize PARAMS ((void));
112 static void set_target_switch PARAMS ((const char *));
113 static const char *decl_name PARAMS ((tree, int));
115 static void float_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
116 static void crash_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
117 static void set_float_handler PARAMS ((jmp_buf));
118 static void compile_file PARAMS ((void));
119 static void display_help PARAMS ((void));
120 static void display_target_options PARAMS ((void));
122 static void decode_d_option PARAMS ((const char *));
123 static int decode_f_option PARAMS ((const char *));
124 static int decode_W_option PARAMS ((const char *));
125 static int decode_g_option PARAMS ((const char *));
126 static unsigned int independent_decode_option PARAMS ((int, char **));
128 static void print_version PARAMS ((FILE *, const char *));
129 static int print_single_switch PARAMS ((FILE *, int, int, const char *,
130 const char *, const char *,
131 const char *, const char *));
132 static void print_switch_values PARAMS ((FILE *, int, int, const char *,
133 const char *, const char *));
135 /* Length of line when printing switch values. */
138 /* Name of program invoked, sans directories. */
140 const char *progname;
142 /* Copy of arguments to toplev_main. */
146 /* Name of current original source file (what was input to cpp).
147 This comes from each #-command in the actual input. */
149 const char *input_filename;
151 /* Name of top-level original source file (what was input to cpp).
152 This comes from the #-command at the beginning of the actual input.
153 If there isn't any there, then this is the cc1 input file name. */
155 const char *main_input_filename;
157 /* Current line number in real source file. */
161 /* Nonzero if it is unsafe to create any new pseudo registers. */
164 /* Stack of currently pending input files. */
166 struct file_stack *input_file_stack;
168 /* Incremented on each change to input_file_stack. */
169 int input_file_stack_tick;
171 /* Name to use as base of names for dump output files. */
173 const char *dump_base_name;
175 /* Format to use to print dumpfile index value */
176 #ifndef DUMPFILE_FORMAT
177 #define DUMPFILE_FORMAT ".%02d."
180 /* Bit flags that specify the machine subtype we are compiling for.
181 Bits are tested using macros TARGET_... defined in the tm.h file
182 and set by `-m...' switches. Must be defined in rtlanal.c. */
184 extern int target_flags;
186 /* Debug hooks - dependent upon command line options. */
188 struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks;
190 /* Describes a dump file. */
192 struct dump_file_info
194 /* The unique extension to apply, e.g. ".jump". */
195 const char *const extension;
197 /* The -d<c> character that enables this dump file. */
198 char const debug_switch;
200 /* True if there is a corresponding graph dump file. */
201 char const graph_dump_p;
203 /* True if the user selected this dump. */
206 /* True if the files have been initialized (ie truncated). */
210 /* Enumerate the extant dump files. */
249 /* Describes all the dump files. Should be kept in order of the
250 pass and in sync with dump_file_index above.
252 Remaining -d letters:
258 static struct dump_file_info dump_file[DFI_MAX] =
260 { "rtl", 'r', 0, 0, 0 },
261 { "sibling", 'i', 0, 0, 0 },
262 { "eh", 'h', 0, 0, 0 },
263 { "jump", 'j', 0, 0, 0 },
264 { "ssa", 'e', 1, 0, 0 },
265 { "ssaccp", 'W', 1, 0, 0 },
266 { "ssadce", 'X', 1, 0, 0 },
267 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
268 { "cse", 's', 0, 0, 0 },
269 { "addressof", 'F', 0, 0, 0 },
270 { "gcse", 'G', 1, 0, 0 },
271 { "loop", 'L', 1, 0, 0 },
272 { "cse2", 't', 1, 0, 0 },
273 { "cfg", 'f', 1, 0, 0 },
274 { "bp", 'b', 1, 0, 0 },
275 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
276 { "combine", 'c', 1, 0, 0 },
277 { "ce", 'C', 1, 0, 0 },
278 { "regmove", 'N', 1, 0, 0 },
279 { "sched", 'S', 1, 0, 0 },
280 { "lreg", 'l', 1, 0, 0 },
281 { "greg", 'g', 1, 0, 0 },
282 { "postreload", 'o', 1, 0, 0 },
283 { "flow2", 'w', 1, 0, 0 },
284 { "peephole2", 'z', 1, 0, 0 },
285 { "rnreg", 'n', 1, 0, 0 },
286 { "ce2", 'E', 1, 0, 0 },
287 { "sched2", 'R', 1, 0, 0 },
288 { "stack", 'k', 1, 0, 0 },
289 { "bbro", 'B', 1, 0, 0 },
290 { "mach", 'M', 1, 0, 0 },
291 { "dbr", 'd', 0, 0, 0 },
294 static int open_dump_file PARAMS ((enum dump_file_index, tree));
295 static void close_dump_file PARAMS ((enum dump_file_index,
296 void (*) (FILE *, rtx), rtx));
298 /* Other flags saying which kinds of debugging dump have been requested. */
300 int rtl_dump_and_exit;
301 int flag_print_asm_name;
302 static int version_flag;
303 static char *filename;
304 enum graph_dump_types graph_dump_format;
306 /* Name for output file of assembly code, specified with -o. */
310 /* Value of the -G xx switch, and whether it was passed or not. */
314 /* Type(s) of debugging information we are producing (if any).
315 See flags.h for the definitions of the different possible
316 types of debugging information. */
317 enum debug_info_type write_symbols = NO_DEBUG;
319 /* Level of debugging information we are producing. See flags.h
320 for the definitions of the different possible levels. */
321 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
323 /* Nonzero means use GNU-only extensions in the generated symbolic
324 debugging information. */
325 /* Currently, this only has an effect when write_symbols is set to
326 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
327 int use_gnu_debug_info_extensions = 0;
329 /* Nonzero means do optimizations. -O.
330 Particular numeric values stand for particular amounts of optimization;
331 thus, -O2 stores 2 here. However, the optimizations beyond the basic
332 ones are not controlled directly by this variable. Instead, they are
333 controlled by individual `flag_...' variables that are defaulted
334 based on this variable. */
338 /* Nonzero means optimize for size. -Os.
339 The only valid values are zero and non-zero. When optimize_size is
340 non-zero, optimize defaults to 2, but certain individual code
341 bloating optimizations are disabled. */
343 int optimize_size = 0;
345 /* Nonzero if we should exit after parsing options. */
346 static int exit_after_options = 0;
348 /* The FUNCTION_DECL for the function currently being compiled,
349 or 0 if between functions. */
350 tree current_function_decl;
352 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
354 tree current_function_func_begin_label;
356 /* Pointer to function to compute the name to use to print a declaration.
357 DECL is the declaration in question.
358 VERBOSITY determines what information will be printed:
359 0: DECL_NAME, demangled as necessary.
360 1: and scope information.
361 2: and any other information that might be interesting, such as function
362 parameter types in C++. */
364 const char *(*decl_printable_name) PARAMS ((tree, int));
366 /* Pointer to function to compute rtl for a language-specific tree code. */
368 typedef rtx (*lang_expand_expr_t)
369 PARAMS ((union tree_node *, rtx, enum machine_mode,
370 enum expand_modifier modifier));
372 lang_expand_expr_t lang_expand_expr = 0;
374 /* Pointer to function to finish handling an incomplete decl at the
375 end of compilation. */
377 void (*incomplete_decl_finalize_hook) PARAMS ((tree)) = 0;
379 /* Nonzero if doing dwarf2 duplicate elimination. */
381 int flag_eliminate_dwarf2_dups = 0;
383 /* Nonzero if generating code to do profiling. */
385 int profile_flag = 0;
387 /* Nonzero if generating code to profile program flow graph arcs. */
389 int profile_arc_flag = 0;
391 /* Nonzero if generating info for gcov to calculate line test coverage. */
393 int flag_test_coverage = 0;
395 /* Nonzero indicates that branch taken probabilities should be calculated. */
397 int flag_branch_probabilities = 0;
399 /* Nonzero if basic blocks should be reordered. */
401 int flag_reorder_blocks = 0;
403 /* Nonzero if registers should be renamed. */
405 int flag_rename_registers = 0;
406 int flag_cprop_registers = 0;
408 /* Nonzero for -pedantic switch: warn about anything
409 that standard spec forbids. */
413 /* Temporarily suppress certain warnings.
414 This is set while reading code from a system header file. */
416 int in_system_header = 0;
418 /* Don't print functions as they are compiled. -quiet. */
422 /* Print times taken by the various passes. -ftime-report. */
426 /* Print memory still in use at end of compilation (which may have little
427 to do with peak memory consumption). -fmem-report. */
431 /* Non-zero means to collect statistics which might be expensive
432 and to print them when we are done. */
433 int flag_detailed_statistics = 0;
438 /* Nonzero means `char' should be signed. */
440 int flag_signed_char;
442 /* Nonzero means give an enum type only as many bytes as it needs. */
444 int flag_short_enums;
446 /* Nonzero for -fcaller-saves: allocate values in regs that need to
447 be saved across function calls, if that produces overall better code.
448 Optional now, so people can test it. */
450 #ifdef DEFAULT_CALLER_SAVES
451 int flag_caller_saves = 1;
453 int flag_caller_saves = 0;
456 /* Nonzero if structures and unions should be returned in memory.
458 This should only be defined if compatibility with another compiler or
459 with an ABI is needed, because it results in slower code. */
461 #ifndef DEFAULT_PCC_STRUCT_RETURN
462 #define DEFAULT_PCC_STRUCT_RETURN 1
465 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
467 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
469 /* Nonzero for -fforce-mem: load memory value into a register
470 before arithmetic on it. This makes better cse but slower compilation. */
472 int flag_force_mem = 0;
474 /* Nonzero for -fforce-addr: load memory address into a register before
475 reference to memory. This makes better cse but slower compilation. */
477 int flag_force_addr = 0;
479 /* Nonzero for -fdefer-pop: don't pop args after each function call;
480 instead save them up to pop many calls' args with one insns. */
482 int flag_defer_pop = 0;
484 /* Nonzero for -ffloat-store: don't allocate floats and doubles
485 in extended-precision registers. */
487 int flag_float_store = 0;
489 /* Nonzero for -fcse-follow-jumps:
490 have cse follow jumps to do a more extensive job. */
492 int flag_cse_follow_jumps;
494 /* Nonzero for -fcse-skip-blocks:
495 have cse follow a branch around a block. */
496 int flag_cse_skip_blocks;
498 /* Nonzero for -fexpensive-optimizations:
499 perform miscellaneous relatively-expensive optimizations. */
500 int flag_expensive_optimizations;
502 /* Nonzero for -fthread-jumps:
503 have jump optimize output of loop. */
505 int flag_thread_jumps;
507 /* Nonzero enables strength-reduction in loop.c. */
509 int flag_strength_reduce = 0;
511 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
512 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
513 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
516 int flag_unroll_loops;
518 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
519 This is generally not a win. */
521 int flag_unroll_all_loops;
523 /* Nonzero enables prefetch optimizations for arrays in loops. */
525 int flag_prefetch_loop_arrays;
527 /* Nonzero forces all invariant computations in loops to be moved
530 int flag_move_all_movables = 0;
532 /* Nonzero forces all general induction variables in loops to be
535 int flag_reduce_all_givs = 0;
537 /* Nonzero to perform full register move optimization passes. This is the
540 int flag_regmove = 0;
542 /* Nonzero for -fwritable-strings:
543 store string constants in data segment and don't uniquize them. */
545 int flag_writable_strings = 0;
547 /* Nonzero means don't put addresses of constant functions in registers.
548 Used for compiling the Unix kernel, where strange substitutions are
549 done on the assembly output. */
551 int flag_no_function_cse = 0;
553 /* Nonzero for -fomit-frame-pointer:
554 don't make a frame pointer in simple functions that don't require one. */
556 int flag_omit_frame_pointer = 0;
558 /* Nonzero means place each function into its own section on those platforms
559 which support arbitrary section names and unlimited numbers of sections. */
561 int flag_function_sections = 0;
563 /* ... and similar for data. */
565 int flag_data_sections = 0;
567 /* Nonzero to inhibit use of define_optimization peephole opts. */
569 int flag_no_peephole = 0;
571 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
573 int flag_optimize_sibling_calls = 0;
575 /* Nonzero means the front end generally wants `errno' maintained by math
576 operations, like built-in SQRT. */
578 int flag_errno_math = 1;
580 /* Nonzero means that unsafe floating-point math optimizations are allowed
581 for the sake of speed. IEEE compliance is not guaranteed, and operations
582 are allowed to assume that their arguments and results are "normal"
583 (e.g., nonnegative for SQRT). */
585 int flag_unsafe_math_optimizations = 0;
587 /* Zero means that floating-point math operations cannot generate a
588 (user-visible) trap. This is the case, for example, in nonstop
589 IEEE 754 arithmetic. */
591 int flag_trapping_math = 1;
593 /* 0 means straightforward implementation of complex divide acceptable.
594 1 means wide ranges of inputs must work for complex divide.
595 2 means C99-like requirements for complex divide (not yet implemented). */
597 int flag_complex_divide_method = 0;
599 /* Nonzero means all references through pointers are volatile. */
603 /* Nonzero means treat all global and extern variables as volatile. */
605 int flag_volatile_global;
607 /* Nonzero means treat all static variables as volatile. */
609 int flag_volatile_static;
611 /* Nonzero means just do syntax checking; don't output anything. */
613 int flag_syntax_only = 0;
615 /* Nonzero means perform global cse. */
617 static int flag_gcse;
619 /* Nonzero means to use global dataflow analysis to eliminate
620 useless null pointer tests. */
622 static int flag_delete_null_pointer_checks;
624 /* Nonzero means to do the enhanced load motion during gcse, which trys
625 to hoist loads by not killing them when a store to the same location
628 int flag_gcse_lm = 1;
630 /* Nonzero means to perform store motion after gcse, which will try to
631 move stores closer to the exit block. Its not very effective without
634 int flag_gcse_sm = 1;
636 /* Nonzero means to rerun cse after loop optimization. This increases
637 compilation time about 20% and picks up a few more common expressions. */
639 static int flag_rerun_cse_after_loop;
641 /* Nonzero means to run loop optimizations twice. */
643 int flag_rerun_loop_opt;
645 /* Nonzero for -finline-functions: ok to inline functions that look like
646 good inline candidates. */
648 int flag_inline_functions;
650 /* Nonzero for -fkeep-inline-functions: even if we make a function
651 go inline everywhere, keep its definition around for debugging
654 int flag_keep_inline_functions;
656 /* Nonzero means that functions will not be inlined. */
658 int flag_no_inline = 2;
660 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
661 not just because the tree inliner turned us off. */
663 int flag_really_no_inline = 2;
665 /* Nonzero means that we should emit static const variables
666 regardless of whether or not optimization is turned on. */
668 int flag_keep_static_consts = 1;
670 /* Nonzero means we should be saving declaration info into a .X file. */
672 int flag_gen_aux_info = 0;
674 /* Specified name of aux-info file. */
676 static char *aux_info_file_name;
678 /* Nonzero means make the text shared if supported. */
680 int flag_shared_data;
682 /* Nonzero means schedule into delayed branch slots if supported. */
684 int flag_delayed_branch;
686 /* Nonzero if we are compiling pure (sharable) code.
687 Value is 1 if we are doing reasonable (i.e. simple
688 offset into offset table) pic. Value is 2 if we can
689 only perform register offsets. */
693 /* Nonzero means generate extra code for exception handling and enable
694 exception handling. */
698 /* Nonzero means generate frame unwind info table when supported. */
700 int flag_unwind_tables = 0;
702 /* Nonzero means generate frame unwind info table exact at each insn boundary */
704 int flag_asynchronous_unwind_tables = 0;
706 /* Nonzero means don't place uninitialized global data in common storage
711 /* Nonzero means pretend it is OK to examine bits of target floats,
712 even if that isn't true. The resulting code will have incorrect constants,
713 but the same series of instructions that the native compiler would make. */
715 int flag_pretend_float;
717 /* Nonzero means change certain warnings into errors.
718 Usually these are warnings about failure to conform to some standard. */
720 int flag_pedantic_errors = 0;
722 /* flag_schedule_insns means schedule insns within basic blocks (before
724 flag_schedule_insns_after_reload means schedule insns after
727 int flag_schedule_insns = 0;
728 int flag_schedule_insns_after_reload = 0;
730 /* The following flags have effect only for scheduling before register
733 flag_schedule_interblock means schedule insns accross basic blocks.
734 flag_schedule_speculative means allow speculative motion of non-load insns.
735 flag_schedule_speculative_load means allow speculative motion of some
737 flag_schedule_speculative_load_dangerous allows speculative motion of more
740 int flag_schedule_interblock = 1;
741 int flag_schedule_speculative = 1;
742 int flag_schedule_speculative_load = 0;
743 int flag_schedule_speculative_load_dangerous = 0;
745 int flag_single_precision_constant;
747 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
748 by a cheaper branch on a count register. */
749 int flag_branch_on_count_reg = 1;
751 /* -finhibit-size-directive inhibits output of .size for ELF.
752 This is used only for compiling crtstuff.c,
753 and it may be extended to other effects
754 needed for crtstuff.c on other systems. */
755 int flag_inhibit_size_directive = 0;
757 /* -fverbose-asm causes extra commentary information to be produced in
758 the generated assembly code (to make it more readable). This option
759 is generally only of use to those who actually need to read the
760 generated assembly code (perhaps while debugging the compiler itself).
761 -fno-verbose-asm, the default, causes the extra information
762 to be omitted and is useful when comparing two assembler files. */
764 int flag_verbose_asm = 0;
766 /* -dA causes debug commentary information to be produced in
767 the generated assembly code (to make it more readable). This option
768 is generally only of use to those who actually need to read the
769 generated assembly code (perhaps while debugging the compiler itself).
770 Currently, this switch is only used by dwarfout.c; however, it is intended
771 to be a catchall for printing debug information in the assembler file. */
773 int flag_debug_asm = 0;
775 /* -dP causes the rtl to be emitted as a comment in assembly. */
777 int flag_dump_rtl_in_asm = 0;
779 /* -fgnu-linker specifies use of the GNU linker for initializations.
780 (Or, more generally, a linker that handles initializations.)
781 -fno-gnu-linker says that collect2 will be used. */
783 int flag_gnu_linker = 0;
785 int flag_gnu_linker = 1;
791 /* Enable ssa conditional constant propagation. */
792 int flag_ssa_ccp = 0;
794 /* Enable ssa aggressive dead code elimination. */
795 int flag_ssa_dce = 0;
797 /* Tag all structures with __attribute__(packed). */
798 int flag_pack_struct = 0;
800 /* Nonzero means that -Wformat accepts certain system-dependent formats. */
801 int flag_format_extensions = 0;
803 /* Emit code to check for stack overflow; also may cause large objects
804 to be allocated dynamically. */
805 int flag_stack_check;
807 /* When non-NULL, indicates that whenever space is allocated on the
808 stack, the resulting stack pointer must not pass this
809 address---that is, for stacks that grow downward, the stack pointer
810 must always be greater than or equal to this address; for stacks
811 that grow upward, the stack pointer must be less than this address.
812 At present, the rtx may be either a REG or a SYMBOL_REF, although
813 the support provided depends on the backend. */
816 /* 0 if pointer arguments may alias each other. True in C.
817 1 if pointer arguments may not alias each other but may alias
819 2 if pointer arguments may not alias each other and may not
820 alias global variables. True in Fortran.
821 This defaults to 0 for C. */
822 int flag_argument_noalias = 0;
824 /* Nonzero if we should do (language-dependent) alias analysis.
825 Typically, this analysis will assume that expressions of certain
826 types do not alias expressions of certain other types. Only used
827 if alias analysis (in general) is enabled. */
828 int flag_strict_aliasing = 0;
830 /* Instrument functions with calls at entry and exit, for profiling. */
831 int flag_instrument_function_entry_exit = 0;
833 /* Nonzero means ignore `#ident' directives. 0 means handle them.
834 On SVR4 targets, it also controls whether or not to emit a
835 string identifying the compiler. */
837 int flag_no_ident = 0;
839 /* This will perform a peephole pass before sched2. */
840 int flag_peephole2 = 0;
842 /* This will try to guess branch probabilities. */
843 int flag_guess_branch_prob = 0;
845 /* -fbounded-pointers causes gcc to compile pointers as composite
846 objects occupying three words: the pointer value, the base address
847 of the referent object, and the address immediately beyond the end
848 of the referent object. The base and extent allow us to perform
849 runtime bounds checking. -fbounded-pointers implies -fcheck-bounds. */
850 int flag_bounded_pointers = 0;
852 /* -fcheck-bounds causes gcc to generate array bounds checks.
853 For C, C++: defaults to value of flag_bounded_pointers.
854 For ObjC: defaults to off.
855 For Java: defaults to on.
856 For Fortran: defaults to off.
857 For CHILL: defaults to off. */
858 int flag_bounds_check = 0;
860 /* This will attempt to merge constant section constants, if 1 only
861 string constants and constants from constant pool, if 2 also constant
863 int flag_merge_constants = 1;
865 /* If one, renumber instruction UIDs to reduce the number of
866 unused UIDs if there are a lot of instructions. If greater than
867 one, unconditionally renumber instruction UIDs. */
868 int flag_renumber_insns = 1;
870 /* Values of the -falign-* flags: how much to align labels in code.
871 0 means `use default', 1 means `don't align'.
872 For each variable, there is an _log variant which is the power
873 of two not less than the variable, for .align output. */
877 int align_loops_max_skip;
880 int align_jumps_max_skip;
882 int align_labels_log;
883 int align_labels_max_skip;
885 int align_functions_log;
887 /* Table of supported debugging formats. */
890 const char *const arg;
891 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
892 constant expression, we use NO_DEBUG in its place. */
893 const enum debug_info_type debug_type;
894 const int use_extensions_p;
895 const char *const description;
899 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
900 N_("Generate debugging info in default format") },
901 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
902 #ifdef DBX_DEBUGGING_INFO
903 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
904 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
906 #ifdef DWARF_DEBUGGING_INFO
907 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
908 { "dwarf+", DWARF_DEBUG, 1,
909 N_("Generate extended DWARF-1 format debug info") },
911 #ifdef DWARF2_DEBUGGING_INFO
912 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
914 #ifdef XCOFF_DEBUGGING_INFO
915 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
916 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
918 #ifdef SDB_DEBUGGING_INFO
919 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
921 #ifdef VMS_DEBUGGING_INFO
922 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") },
929 const char *const string;
932 const char *const description;
934 lang_independent_options;
938 /* Add or remove a leading underscore from user symbols. */
939 int flag_leading_underscore = -1;
941 /* The user symbol prefix after having resolved same. */
942 const char *user_label_prefix;
944 static const param_info lang_independent_params[] = {
945 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
946 { OPTION, DEFAULT, HELP },
947 #include "params.def"
952 /* A default for same. */
953 #ifndef USER_LABEL_PREFIX
954 #define USER_LABEL_PREFIX ""
957 /* Table of language-independent -f options.
958 STRING is the option name. VARIABLE is the address of the variable.
959 ON_VALUE is the value to store in VARIABLE
960 if `-fSTRING' is seen as an option.
961 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
963 static const lang_independent_options f_options[] =
965 {"format-extensions", &flag_format_extensions, 1,
966 N_("-Wformat accepts certain FreeBSD system-dependent formats") },
967 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
968 N_("Perform DWARF2 duplicate elimination") },
969 {"float-store", &flag_float_store, 1,
970 N_("Do not store floats in registers") },
971 {"volatile", &flag_volatile, 1,
972 N_("Consider all mem refs through pointers as volatile") },
973 {"volatile-global", &flag_volatile_global, 1,
974 N_("Consider all mem refs to global data to be volatile") },
975 {"volatile-static", &flag_volatile_static, 1,
976 N_("Consider all mem refs to static data to be volatile") },
977 {"defer-pop", &flag_defer_pop, 1,
978 N_("Defer popping functions args from stack until later") },
979 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
980 N_("When possible do not generate stack frames") },
981 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
982 N_("Optimize sibling and tail recursive calls") },
983 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
984 N_("When running CSE, follow jumps to their targets") },
985 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
986 N_("When running CSE, follow conditional jumps") },
987 {"expensive-optimizations", &flag_expensive_optimizations, 1,
988 N_("Perform a number of minor, expensive optimizations") },
989 {"thread-jumps", &flag_thread_jumps, 1,
990 N_("Perform jump threading optimizations") },
991 {"strength-reduce", &flag_strength_reduce, 1,
992 N_("Perform strength reduction optimizations") },
993 {"unroll-loops", &flag_unroll_loops, 1,
994 N_("Perform loop unrolling when iteration count is known") },
995 {"unroll-all-loops", &flag_unroll_all_loops, 1,
996 N_("Perform loop unrolling for all loops") },
997 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
998 N_("Generate prefetch instructions, if available, for arrays in loops") },
999 {"move-all-movables", &flag_move_all_movables, 1,
1000 N_("Force all loop invariant computations out of loops") },
1001 {"reduce-all-givs", &flag_reduce_all_givs, 1,
1002 N_("Strength reduce all loop general induction variables") },
1003 {"writable-strings", &flag_writable_strings, 1,
1004 N_("Store strings in writable data section") },
1005 {"peephole", &flag_no_peephole, 0,
1006 N_("Enable machine specific peephole optimizations") },
1007 {"force-mem", &flag_force_mem, 1,
1008 N_("Copy memory operands into registers before using") },
1009 {"force-addr", &flag_force_addr, 1,
1010 N_("Copy memory address constants into regs before using") },
1011 {"function-cse", &flag_no_function_cse, 0,
1012 N_("Allow function addresses to be held in registers") },
1013 {"inline-functions", &flag_inline_functions, 1,
1014 N_("Integrate simple functions into their callers") },
1015 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1016 N_("Generate code for funcs even if they are fully inlined") },
1017 {"inline", &flag_no_inline, 0,
1018 N_("Pay attention to the 'inline' keyword") },
1019 {"keep-static-consts", &flag_keep_static_consts, 1,
1020 N_("Emit static const variables even if they are not used") },
1021 {"syntax-only", &flag_syntax_only, 1,
1022 N_("Check for syntax errors, then stop") },
1023 {"shared-data", &flag_shared_data, 1,
1024 N_("Mark data as shared rather than private") },
1025 {"caller-saves", &flag_caller_saves, 1,
1026 N_("Enable saving registers around function calls") },
1027 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1028 N_("Return 'short' aggregates in memory, not registers") },
1029 {"reg-struct-return", &flag_pcc_struct_return, 0,
1030 N_("Return 'short' aggregates in registers") },
1031 {"delayed-branch", &flag_delayed_branch, 1,
1032 N_("Attempt to fill delay slots of branch instructions") },
1033 {"gcse", &flag_gcse, 1,
1034 N_("Perform the global common subexpression elimination") },
1035 {"gcse-lm", &flag_gcse_lm, 1,
1036 N_("Perform enhanced load motion during global subexpression elimination") },
1037 {"gcse-sm", &flag_gcse_sm, 1,
1038 N_("Perform store motion after global subexpression elimination") },
1039 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1040 N_("Run CSE pass after loop optimizations") },
1041 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1042 N_("Run the loop optimizer twice") },
1043 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1044 N_("Delete useless null pointer checks") },
1045 {"pretend-float", &flag_pretend_float, 1,
1046 N_("Pretend that host and target use the same FP format") },
1047 {"schedule-insns", &flag_schedule_insns, 1,
1048 N_("Reschedule instructions before register allocation") },
1049 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1050 N_("Reschedule instructions after register allocation") },
1051 {"sched-interblock",&flag_schedule_interblock, 1,
1052 N_("Enable scheduling across basic blocks") },
1053 {"sched-spec",&flag_schedule_speculative, 1,
1054 N_("Allow speculative motion of non-loads") },
1055 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1056 N_("Allow speculative motion of some loads") },
1057 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1058 N_("Allow speculative motion of more loads") },
1059 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1060 N_("Replace add,compare,branch with branch on count reg") },
1061 {"pic", &flag_pic, 1,
1062 N_("Generate position independent code, if possible") },
1063 {"PIC", &flag_pic, 2, ""},
1064 {"exceptions", &flag_exceptions, 1,
1065 N_("Enable exception handling") },
1066 {"unwind-tables", &flag_unwind_tables, 1,
1067 N_("Just generate unwind tables for exception handling") },
1068 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1069 N_("Generate unwind tables exact at each instruction boundary") },
1070 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1071 N_("Support synchronous non-call exceptions") },
1072 {"profile-arcs", &profile_arc_flag, 1,
1073 N_("Insert arc based program profiling code") },
1074 {"test-coverage", &flag_test_coverage, 1,
1075 N_("Create data files needed by gcov") },
1076 {"branch-probabilities", &flag_branch_probabilities, 1,
1077 N_("Use profiling information for branch probabilities") },
1078 {"reorder-blocks", &flag_reorder_blocks, 1,
1079 N_("Reorder basic blocks to improve code placement") },
1080 {"rename-registers", &flag_rename_registers, 1,
1081 N_("Do the register renaming optimization pass") },
1082 {"cprop-registers", &flag_cprop_registers, 1,
1083 N_("Do the register copy-propagation optimization pass") },
1084 {"common", &flag_no_common, 0,
1085 N_("Do not put uninitialized globals in the common section") },
1086 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1087 N_("Do not generate .size directives") },
1088 {"function-sections", &flag_function_sections, 1,
1089 N_("place each function into its own section") },
1090 {"data-sections", &flag_data_sections, 1,
1091 N_("place data items into their own section") },
1092 {"verbose-asm", &flag_verbose_asm, 1,
1093 N_("Add extra commentry to assembler output") },
1094 {"gnu-linker", &flag_gnu_linker, 1,
1095 N_("Output GNU ld formatted global initializers") },
1096 {"regmove", &flag_regmove, 1,
1097 N_("Enables a register move optimization") },
1098 {"optimize-register-move", &flag_regmove, 1,
1099 N_("Do the full regmove optimization pass") },
1100 {"pack-struct", &flag_pack_struct, 1,
1101 N_("Pack structure members together without holes") },
1102 {"stack-check", &flag_stack_check, 1,
1103 N_("Insert stack checking code into the program") },
1104 {"argument-alias", &flag_argument_noalias, 0,
1105 N_("Specify that arguments may alias each other & globals") },
1106 {"argument-noalias", &flag_argument_noalias, 1,
1107 N_("Assume arguments may alias globals but not each other") },
1108 {"argument-noalias-global", &flag_argument_noalias, 2,
1109 N_("Assume arguments do not alias each other or globals") },
1110 {"strict-aliasing", &flag_strict_aliasing, 1,
1111 N_("Assume strict aliasing rules apply") },
1112 {"align-loops", &align_loops, 0,
1113 N_("Align the start of loops") },
1114 {"align-jumps", &align_jumps, 0,
1115 N_("Align labels which are only reached by jumping") },
1116 {"align-labels", &align_labels, 0,
1117 N_("Align all labels") },
1118 {"align-functions", &align_functions, 0,
1119 N_("Align the start of functions") },
1120 {"merge-constants", &flag_merge_constants, 1,
1121 N_("Attempt to merge identical constants accross compilation units") },
1122 {"merge-all-constants", &flag_merge_constants, 2,
1123 N_("Attempt to merge identical constants and constant variables") },
1124 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1125 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1126 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1127 N_("Instrument function entry/exit with profiling calls") },
1128 {"ssa", &flag_ssa, 1,
1129 N_("Enable SSA optimizations") },
1130 {"ssa-ccp", &flag_ssa_ccp, 1,
1131 N_("Enable SSA conditional constant propagation") },
1132 {"ssa-dce", &flag_ssa_dce, 1,
1133 N_("Enable aggressive SSA dead code elimination") },
1134 {"leading-underscore", &flag_leading_underscore, 1,
1135 N_("External symbols have a leading underscore") },
1136 {"ident", &flag_no_ident, 0,
1137 N_("Process #ident directives") },
1138 { "peephole2", &flag_peephole2, 1,
1139 N_("Enables an rtl peephole pass run before sched2") },
1140 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1141 N_("Enables guessing of branch probabilities") },
1142 {"math-errno", &flag_errno_math, 1,
1143 N_("Set errno after built-in math functions") },
1144 {"trapping-math", &flag_trapping_math, 1,
1145 N_("Floating-point operations can trap") },
1146 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1147 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1148 {"bounded-pointers", &flag_bounded_pointers, 1,
1149 N_("Compile pointers as triples: value, base & end") },
1150 {"bounds-check", &flag_bounds_check, 1,
1151 N_("Generate code to check bounds before dereferencing pointers and arrays") },
1152 {"single-precision-constant", &flag_single_precision_constant, 1,
1153 N_("Convert floating point constant to single precision constant") },
1154 {"time-report", &time_report, 1,
1155 N_("Report time taken by each compiler pass at end of run") },
1156 {"mem-report", &mem_report, 1,
1157 N_("Report on permanent memory allocation at end of run") },
1158 { "trapv", &flag_trapv, 1,
1159 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1162 /* Table of language-specific options. */
1164 static const struct lang_opt
1166 const char *const option;
1167 const char *const description;
1169 documented_lang_options[] =
1171 /* In order not to overload the --help output, the convention
1172 used here is to only describe those options which are not
1173 enabled by default. */
1176 N_("Compile just for ISO C89") },
1177 { "-fallow-single-precision",
1178 N_("Do not promote floats to double if using -traditional") },
1180 N_("Determine language standard") },
1182 { "-fsigned-bitfields", "" },
1183 { "-funsigned-bitfields",
1184 N_("Make bit-fields by unsigned by default") },
1185 { "-fno-signed-bitfields", "" },
1186 { "-fno-unsigned-bitfields","" },
1188 N_("Make 'char' be signed by default") },
1189 { "-funsigned-char",
1190 N_("Make 'char' be unsigned by default") },
1191 { "-fno-signed-char", "" },
1192 { "-fno-unsigned-char", "" },
1194 { "-ftraditional", "" },
1196 N_("Attempt to support traditional K&R style C") },
1197 { "-fnotraditional", "" },
1198 { "-fno-traditional", "" },
1202 N_("Do not recognize the 'asm' keyword") },
1203 { "-fbuiltin", "" },
1205 N_("Do not recognize any built in functions") },
1207 N_("Assume normal C execution environment") },
1208 { "-fno-hosted", "" },
1210 N_("Assume that standard libraries & main might not exist") },
1211 { "-fno-freestanding", "" },
1212 { "-fcond-mismatch",
1213 N_("Allow different types as args of ? operator") },
1214 { "-fno-cond-mismatch", "" },
1215 { "-fdollars-in-identifiers",
1216 N_("Allow the use of $ inside identifiers") },
1217 { "-fno-dollars-in-identifiers", "" },
1218 { "-fpreprocessed", "" },
1219 { "-fno-preprocessed", "" },
1221 N_("Use the same size for double as for float") },
1222 { "-fno-short-double", "" },
1224 N_("Use the smallest fitting integer to hold enums") },
1225 { "-fno-short-enums", "" },
1227 N_("Override the underlying type for wchar_t to `unsigned short'") },
1228 { "-fno-short-wchar", "" },
1231 N_("Enable most warning messages") },
1232 { "-Wbad-function-cast",
1233 N_("Warn about casting functions to incompatible types") },
1234 { "-Wno-bad-function-cast", "" },
1235 { "-Wno-missing-noreturn", "" },
1236 { "-Wmissing-format-attribute",
1237 N_("Warn about functions which might be candidates for format attributes") },
1238 { "-Wno-missing-format-attribute", "" },
1240 N_("Warn about casts which discard qualifiers") },
1241 { "-Wno-cast-qual", "" },
1242 { "-Wchar-subscripts",
1243 N_("Warn about subscripts whose type is 'char'") },
1244 { "-Wno-char-subscripts", "" },
1246 N_("Warn if nested comments are detected") },
1247 { "-Wno-comment", "" },
1249 N_("Warn if nested comments are detected") },
1250 { "-Wno-comments", "" },
1252 N_("Warn about possibly confusing type conversions") },
1253 { "-Wno-conversion", "" },
1255 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1256 { "-Wno-format", "" },
1257 { "-Wformat-y2k", "" },
1258 { "-Wno-format-y2k",
1259 N_("Don't warn about strftime formats yielding 2 digit years") },
1260 { "-Wformat-extra-args", "" },
1261 { "-Wno-format-extra-args",
1262 N_("Don't warn about too many arguments to format functions") },
1263 { "-Wformat-nonliteral",
1264 N_("Warn about non-string-literal format strings") },
1265 { "-Wno-format-nonliteral", "" },
1266 { "-Wformat-security",
1267 N_("Warn about possible security problems with format functions") },
1268 { "-Wno-format-security", "" },
1269 { "-Wimplicit-function-declaration",
1270 N_("Warn about implicit function declarations") },
1271 { "-Wno-implicit-function-declaration", "" },
1272 { "-Werror-implicit-function-declaration", "" },
1274 N_("Warn when a declaration does not specify a type") },
1275 { "-Wno-implicit-int", "" },
1276 { "-Wimplicit", "" },
1277 { "-Wno-implicit", "" },
1279 N_("Warn about the use of the #import directive") },
1280 { "-Wno-import", "" },
1281 { "-Wlong-long","" },
1283 N_("Do not warn about using 'long long' when -pedantic") },
1285 N_("Warn about suspicious declarations of main") },
1286 { "-Wno-main", "" },
1287 { "-Wmissing-braces",
1288 N_("Warn about possibly missing braces around initializers") },
1289 { "-Wno-missing-braces", "" },
1290 { "-Wmissing-declarations",
1291 N_("Warn about global funcs without previous declarations") },
1292 { "-Wno-missing-declarations", "" },
1293 { "-Wmissing-prototypes",
1294 N_("Warn about global funcs without prototypes") },
1295 { "-Wno-missing-prototypes", "" },
1297 N_("Warn about use of multicharacter literals") },
1298 { "-Wno-multichar", "" },
1299 { "-Wnested-externs",
1300 N_("Warn about externs not at file scope level") },
1301 { "-Wno-nested-externs", "" },
1303 N_("Warn about possible missing parentheses") },
1304 { "-Wno-parentheses", "" },
1305 { "-Wsequence-point",
1306 N_("Warn about possible violations of sequence point rules") },
1307 { "-Wno-sequence-point", "" },
1308 { "-Wpointer-arith",
1309 N_("Warn about function pointer arithmetic") },
1310 { "-Wno-pointer-arith", "" },
1311 { "-Wredundant-decls",
1312 N_("Warn about multiple declarations of the same object") },
1313 { "-Wno-redundant-decls", "" },
1315 N_("Warn about signed/unsigned comparisons") },
1316 { "-Wno-sign-compare", "" },
1318 N_("Warn about testing equality of floating point numbers") },
1319 { "-Wno-float-equal", "" },
1320 { "-Wunknown-pragmas",
1321 N_("Warn about unrecognized pragmas") },
1322 { "-Wno-unknown-pragmas", "" },
1323 { "-Wstrict-prototypes",
1324 N_("Warn about non-prototyped function decls") },
1325 { "-Wno-strict-prototypes", "" },
1327 N_("Warn about constructs whose meaning change in ISO C") },
1328 { "-Wno-traditional", "" },
1330 N_("Warn when trigraphs are encountered") },
1331 { "-Wno-trigraphs", "" },
1333 { "-Wno-undef", "" },
1334 { "-Wwrite-strings",
1335 N_("Mark strings as 'const char *'") },
1336 { "-Wno-write-strings", "" },
1338 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1340 #include "options.h"
1344 /* Here is a table, controlled by the tm.h file, listing each -m switch
1345 and which bits in `target_switches' it should set or clear.
1346 If VALUE is positive, it is bits to set.
1347 If VALUE is negative, -VALUE is bits to clear.
1348 (The sign bit is not used so there is no confusion.) */
1352 const char *const name;
1354 const char *const description;
1356 target_switches [] = TARGET_SWITCHES;
1358 /* This table is similar, but allows the switch to have a value. */
1360 #ifdef TARGET_OPTIONS
1363 const char *const prefix;
1364 const char **const variable;
1365 const char *const description;
1367 target_options [] = TARGET_OPTIONS;
1370 /* Options controlling warnings. */
1372 /* Don't print warning messages. -w. */
1374 int inhibit_warnings = 0;
1376 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1378 int warn_system_headers = 0;
1380 /* Print various extra warnings. -W. */
1382 int extra_warnings = 0;
1384 /* Treat warnings as errors. -Werror. */
1386 int warnings_are_errors = 0;
1388 /* Nonzero to warn about unused variables, functions et.al. */
1390 int warn_unused_function;
1391 int warn_unused_label;
1392 int warn_unused_parameter;
1393 int warn_unused_variable;
1394 int warn_unused_value;
1396 /* Nonzero to warn about code which is never reached. */
1398 int warn_notreached;
1400 /* Nonzero to warn about variables used before they are initialized. */
1402 int warn_uninitialized;
1404 /* Nonzero means warn about all declarations which shadow others. */
1408 /* Warn if a switch on an enum fails to have a case for every enum value. */
1412 /* Nonzero means warn about function definitions that default the return type
1413 or that use a null return and have a return-type other than void. */
1415 int warn_return_type;
1417 /* Nonzero means warn about pointer casts that increase the required
1418 alignment of the target type (and might therefore lead to a crash
1419 due to a misaligned access). */
1421 int warn_cast_align;
1423 /* Nonzero means warn about any objects definitions whose size is larger
1424 than N bytes. Also want about function definitions whose returned
1425 values are larger than N bytes. The value N is in `larger_than_size'. */
1427 int warn_larger_than;
1428 HOST_WIDE_INT larger_than_size;
1430 /* Nonzero means warn if inline function is too large. */
1434 /* Warn if a function returns an aggregate,
1435 since there are often incompatible calling conventions for doing this. */
1437 int warn_aggregate_return;
1439 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1443 /* Warn when gcc pads a structure to an alignment boundary. */
1447 /* Warn when an optimization pass is disabled. */
1449 int warn_disabled_optimization;
1451 /* Warn about functions which might be candidates for attribute noreturn. */
1453 int warn_missing_noreturn;
1455 /* Nonzero means warn about uses of __attribute__((deprecated))
1458 int warn_deprecated_decl = 1;
1460 /* Likewise for -W. */
1462 static const lang_independent_options W_options[] =
1464 {"unused-function", &warn_unused_function, 1,
1465 N_("Warn when a function is unused") },
1466 {"unused-label", &warn_unused_label, 1,
1467 N_("Warn when a label is unused") },
1468 {"unused-parameter", &warn_unused_parameter, 1,
1469 N_("Warn when a function parameter is unused") },
1470 {"unused-variable", &warn_unused_variable, 1,
1471 N_("Warn when a variable is unused") },
1472 {"unused-value", &warn_unused_value, 1,
1473 N_("Warn when an expression value is unused") },
1474 {"system-headers", &warn_system_headers, 1,
1475 N_("Do not suppress warnings from system headers") },
1476 {"error", &warnings_are_errors, 1,
1477 N_("Treat all warnings as errors") },
1478 {"shadow", &warn_shadow, 1,
1479 N_("Warn when one local variable shadows another") },
1480 {"switch", &warn_switch, 1,
1481 N_("Warn about enumerated switches missing a specific case") },
1482 {"aggregate-return", &warn_aggregate_return, 1,
1483 N_("Warn about returning structures, unions or arrays") },
1484 {"cast-align", &warn_cast_align, 1,
1485 N_("Warn about pointer casts which increase alignment") },
1486 {"unreachable-code", &warn_notreached, 1,
1487 N_("Warn about code that will never be executed") },
1488 {"uninitialized", &warn_uninitialized, 1,
1489 N_("Warn about uninitialized automatic variables") },
1490 {"inline", &warn_inline, 1,
1491 N_("Warn when an inlined function cannot be inlined") },
1492 {"packed", &warn_packed, 1,
1493 N_("Warn when the packed attribute has no effect on struct layout") },
1494 {"padded", &warn_padded, 1,
1495 N_("Warn when padding is required to align struct members") },
1496 {"disabled-optimization", &warn_disabled_optimization, 1,
1497 N_("Warn when an optimization pass is disabled") },
1498 {"deprecated-declarations", &warn_deprecated_decl, 1,
1499 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1500 {"missing-noreturn", &warn_missing_noreturn, 1,
1501 N_("Warn about functions which might be candidates for attribute noreturn") }
1505 set_Wunused (setting)
1508 warn_unused_function = setting;
1509 warn_unused_label = setting;
1510 /* Unused function parameter warnings are reported when either ``-W
1511 -Wunused'' or ``-Wunused-parameter'' is specified. Differentiate
1512 -Wunused by setting WARN_UNUSED_PARAMETER to -1. */
1514 warn_unused_parameter = 0;
1515 else if (!warn_unused_parameter)
1516 warn_unused_parameter = -1;
1517 warn_unused_variable = setting;
1518 warn_unused_value = setting;
1521 /* The following routines are useful in setting all the flags that
1522 -ffast-math and -fno-fast-math imply. */
1525 set_fast_math_flags ()
1527 flag_trapping_math = 0;
1528 flag_unsafe_math_optimizations = 1;
1529 flag_errno_math = 0;
1533 set_no_fast_math_flags ()
1535 flag_trapping_math = 1;
1536 flag_unsafe_math_optimizations = 0;
1537 flag_errno_math = 1;
1541 /* Output files for assembler code (real compiler output)
1542 and debugging dumps. */
1545 FILE *aux_info_file;
1546 FILE *rtl_dump_file = NULL;
1548 /* Decode the string P as an integral parameter.
1549 If the string is indeed an integer return its numeric value else
1550 issue an Invalid Option error for the option PNAME and return DEFVAL.
1551 If PNAME is zero just return DEFVAL, do not call error. */
1554 read_integral_parameter (p, pname, defval)
1559 const char *endp = p;
1563 if (ISDIGIT (*endp))
1572 error ("invalid option `%s'", pname);
1580 /* This is the default decl_printable_name function. */
1583 decl_name (decl, verbosity)
1585 int verbosity ATTRIBUTE_UNUSED;
1587 return IDENTIFIER_POINTER (DECL_NAME (decl));
1591 /* This calls abort and is used to avoid problems when abort if a macro.
1592 It is used when we need to pass the address of abort. */
1600 /* When `malloc.c' is compiled with `rcheck' defined,
1601 it calls this function to report clobberage. */
1605 const char *s ATTRIBUTE_UNUSED;
1610 /* Return the logarithm of X, base 2, considering X unsigned,
1611 if X is a power of 2. Otherwise, returns -1.
1613 This should be used via the `exact_log2' macro. */
1617 unsigned HOST_WIDE_INT x;
1620 /* Test for 0 or a power of 2. */
1621 if (x == 0 || x != (x & -x))
1623 while ((x >>= 1) != 0)
1628 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1629 If X is 0, return -1.
1631 This should be used via the floor_log2 macro. */
1635 unsigned HOST_WIDE_INT x;
1644 static int float_handler_set;
1646 jmp_buf float_handler;
1648 /* Signals actually come here. */
1651 float_signal (signo)
1652 /* If this is missing, some compilers complain. */
1653 int signo ATTRIBUTE_UNUSED;
1655 if (float_handled == 0)
1656 crash_signal (signo);
1659 /* On System-V derived systems, we must reinstall the signal handler.
1660 This is harmless on BSD-derived systems. */
1661 signal (SIGFPE, float_signal);
1662 longjmp (float_handler, 1);
1665 /* Specify where to longjmp to when a floating arithmetic error happens.
1666 If HANDLER is 0, it means don't handle the errors any more. */
1669 set_float_handler (handler)
1672 float_handled = (handler != 0);
1674 memcpy (float_handler, handler, sizeof (float_handler));
1676 if (float_handled && ! float_handler_set)
1678 signal (SIGFPE, float_signal);
1679 float_handler_set = 1;
1683 /* This is a wrapper function for code which might elicit an
1684 arithmetic exception. That code should be passed in as a function
1685 pointer FN, and one argument DATA. DATA is usually a struct which
1686 contains the real input and output for function FN. This function
1687 returns 0 (failure) if longjmp was called (i.e. an exception
1688 occurred.) It returns 1 (success) otherwise. */
1691 do_float_handler (fn, data)
1692 void (*fn) PARAMS ((PTR));
1699 /* We got here via longjmp () caused by an exception in function
1701 set_float_handler (NULL);
1705 set_float_handler (buf);
1707 set_float_handler (NULL);
1711 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1712 into ICE messages, which is much more user friendly. */
1715 crash_signal (signo)
1718 internal_error ("internal error: %s", strsignal (signo));
1721 /* Strip off a legitimate source ending from the input string NAME of
1722 length LEN. Rather than having to know the names used by all of
1723 our front ends, we strip off an ending of a period followed by
1724 up to five characters. (Java uses ".class".) */
1727 strip_off_ending (name, len)
1732 for (i = 2; i < 6 && len > i; i++)
1734 if (name[len - i] == '.')
1736 name[len - i] = '\0';
1742 /* Output a quoted string. */
1745 output_quoted_string (asm_file, string)
1749 #ifdef OUTPUT_QUOTED_STRING
1750 OUTPUT_QUOTED_STRING (asm_file, string);
1754 putc ('\"', asm_file);
1755 while ((c = *string++) != 0)
1759 if (c == '\"' || c == '\\')
1760 putc ('\\', asm_file);
1764 fprintf (asm_file, "\\%03o", c);
1766 putc ('\"', asm_file);
1770 /* Output a file name in the form wanted by System V. */
1773 output_file_directive (asm_file, input_name)
1775 const char *input_name;
1777 int len = strlen (input_name);
1778 const char *na = input_name + len;
1780 /* NA gets INPUT_NAME sans directory names. */
1781 while (na > input_name)
1783 if (IS_DIR_SEPARATOR (na[-1]))
1788 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1789 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1791 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1792 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1794 fprintf (asm_file, "\t.file\t");
1795 output_quoted_string (asm_file, na);
1796 fputc ('\n', asm_file);
1801 /* Routine to open a dump file. Return true if the dump file is enabled. */
1804 open_dump_file (index, decl)
1805 enum dump_file_index index;
1809 const char *open_arg;
1812 if (! dump_file[index].enabled)
1815 timevar_push (TV_DUMP);
1816 if (rtl_dump_file != NULL)
1817 fclose (rtl_dump_file);
1819 sprintf (seq, DUMPFILE_FORMAT, index);
1821 if (! dump_file[index].initialized)
1823 /* If we've not initialized the files, do so now. */
1824 if (graph_dump_format != no_graph
1825 && dump_file[index].graph_dump_p)
1827 dump_name = concat (seq, dump_file[index].extension, NULL);
1828 clean_graph_dump_file (dump_base_name, dump_name);
1831 dump_file[index].initialized = 1;
1837 dump_name = concat (dump_base_name, seq,
1838 dump_file[index].extension, NULL);
1840 rtl_dump_file = fopen (dump_name, open_arg);
1841 if (rtl_dump_file == NULL)
1842 fatal_io_error ("can't open %s", dump_name);
1847 fprintf (rtl_dump_file, "\n;; Function %s\n\n",
1848 decl_printable_name (decl, 2));
1850 timevar_pop (TV_DUMP);
1854 /* Routine to close a dump file. */
1857 close_dump_file (index, func, insns)
1858 enum dump_file_index index;
1859 void (*func) PARAMS ((FILE *, rtx));
1862 if (! rtl_dump_file)
1865 timevar_push (TV_DUMP);
1867 && graph_dump_format != no_graph
1868 && dump_file[index].graph_dump_p)
1873 sprintf (seq, DUMPFILE_FORMAT, index);
1874 suffix = concat (seq, dump_file[index].extension, NULL);
1875 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1880 func (rtl_dump_file, insns);
1882 fflush (rtl_dump_file);
1883 fclose (rtl_dump_file);
1885 rtl_dump_file = NULL;
1886 timevar_pop (TV_DUMP);
1889 /* Do any final processing required for the declarations in VEC, of
1890 which there are LEN. We write out inline functions and variables
1891 that have been deferred until this point, but which are required.
1892 Returns non-zero if anything was put out. */
1895 wrapup_global_declarations (vec, len)
1902 int output_something = 0;
1904 for (i = 0; i < len; i++)
1908 /* We're not deferring this any longer. */
1909 DECL_DEFER_OUTPUT (decl) = 0;
1911 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0
1912 && incomplete_decl_finalize_hook != 0)
1913 (*incomplete_decl_finalize_hook) (decl);
1916 /* Now emit any global variables or functions that we have been
1917 putting off. We need to loop in case one of the things emitted
1918 here references another one which comes earlier in the list. */
1922 for (i = 0; i < len; i++)
1926 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
1929 /* Don't write out static consts, unless we still need them.
1931 We also keep static consts if not optimizing (for debugging),
1932 unless the user specified -fno-keep-static-consts.
1933 ??? They might be better written into the debug information.
1934 This is possible when using DWARF.
1936 A language processor that wants static constants to be always
1937 written out (even if it is not used) is responsible for
1938 calling rest_of_decl_compilation itself. E.g. the C front-end
1939 calls rest_of_decl_compilation from finish_decl.
1940 One motivation for this is that is conventional in some
1941 environments to write things like:
1942 static const char rcsid[] = "... version string ...";
1943 intending to force the string to be in the executable.
1945 A language processor that would prefer to have unneeded
1946 static constants "optimized away" would just defer writing
1947 them out until here. E.g. C++ does this, because static
1948 constants are often defined in header files.
1950 ??? A tempting alternative (for both C and C++) would be
1951 to force a constant to be written if and only if it is
1952 defined in a main file, as opposed to an include file. */
1954 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
1958 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
1960 else if (DECL_COMDAT (decl))
1962 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
1963 && (optimize || !flag_keep_static_consts
1964 || DECL_ARTIFICIAL (decl)))
1970 rest_of_decl_compilation (decl, NULL, 1, 1);
1974 if (TREE_CODE (decl) == FUNCTION_DECL
1975 && DECL_INITIAL (decl) != 0
1976 && DECL_SAVED_INSNS (decl) != 0
1977 && (flag_keep_inline_functions
1978 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1979 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1982 output_inline_function (decl);
1987 output_something = 1;
1991 return output_something;
1994 /* Issue appropriate warnings for the global declarations in VEC (of
1995 which there are LEN). Output debugging information for them. */
1998 check_global_declarations (vec, len)
2005 for (i = 0; i < len; i++)
2009 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
2010 && ! TREE_ASM_WRITTEN (decl))
2011 /* Cancel the RTL for this decl so that, if debugging info
2012 output for global variables is still to come,
2013 this one will be omitted. */
2014 SET_DECL_RTL (decl, NULL_RTX);
2016 /* Warn about any function
2017 declared static but not defined.
2018 We don't warn about variables,
2019 because many programs have static variables
2020 that exist only to get some text into the object file. */
2021 if (TREE_CODE (decl) == FUNCTION_DECL
2022 && (warn_unused_function
2023 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2024 && DECL_INITIAL (decl) == 0
2025 && DECL_EXTERNAL (decl)
2026 && ! DECL_ARTIFICIAL (decl)
2027 && ! TREE_PUBLIC (decl))
2029 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2030 pedwarn_with_decl (decl,
2031 "`%s' used but never defined");
2033 warning_with_decl (decl,
2034 "`%s' declared `static' but never defined");
2035 /* This symbol is effectively an "extern" declaration now. */
2036 TREE_PUBLIC (decl) = 1;
2037 assemble_external (decl);
2040 /* Warn about static fns or vars defined but not used,
2041 but not about inline functions or static consts
2042 since defining those in header files is normal practice. */
2043 if (((warn_unused_function
2044 && TREE_CODE (decl) == FUNCTION_DECL && ! DECL_INLINE (decl))
2045 || (warn_unused_variable
2046 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
2047 && ! DECL_IN_SYSTEM_HEADER (decl)
2048 && ! DECL_EXTERNAL (decl)
2049 && ! TREE_PUBLIC (decl)
2050 && ! TREE_USED (decl)
2051 && (TREE_CODE (decl) == FUNCTION_DECL || ! DECL_REGISTER (decl))
2052 /* The TREE_USED bit for file-scope decls
2053 is kept in the identifier, to handle multiple
2054 external decls in different scopes. */
2055 && ! TREE_USED (DECL_NAME (decl)))
2056 warning_with_decl (decl, "`%s' defined but not used");
2058 timevar_push (TV_SYMOUT);
2059 (*debug_hooks->global_decl) (decl);
2060 timevar_pop (TV_SYMOUT);
2064 /* Save the current INPUT_FILENAME and LINENO on the top entry in the
2065 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2066 INPUT_FILENAME and LINENO accordingly. */
2069 push_srcloc (file, line)
2073 struct file_stack *fs;
2075 if (input_file_stack)
2077 input_file_stack->name = input_filename;
2078 input_file_stack->line = lineno;
2081 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2082 fs->name = input_filename = file;
2083 fs->line = lineno = line;
2084 fs->indent_level = 0;
2085 fs->next = input_file_stack;
2086 input_file_stack = fs;
2087 input_file_stack_tick++;
2090 /* Pop the top entry off the stack of presently open source files.
2091 Restore the INPUT_FILENAME and LINENO from the new topmost entry on
2097 struct file_stack *fs;
2099 fs = input_file_stack;
2100 input_file_stack = fs->next;
2102 input_file_stack_tick++;
2103 /* The initial source file is never popped. */
2104 if (!input_file_stack)
2106 input_filename = input_file_stack->name;
2107 lineno = input_file_stack->line;
2110 /* Compile an entire translation unit. Write a file of assembly
2111 output and various debugging dumps. */
2118 /* Initialize yet another pass. */
2120 init_final (main_input_filename);
2121 init_branch_prob (dump_base_name);
2123 timevar_push (TV_PARSE);
2125 /* Call the parser, which parses the entire file
2126 (calling rest_of_compilation for each function). */
2129 /* In case there were missing block closers,
2130 get us back to the global binding level. */
2131 (*lang_hooks.clear_binding_stack) ();
2133 /* Compilation is now finished except for writing
2134 what's left of the symbol table output. */
2136 timevar_pop (TV_PARSE);
2138 if (flag_syntax_only)
2141 globals = getdecls ();
2143 /* Really define vars that have had only a tentative definition.
2144 Really output inline functions that must actually be callable
2145 and have not been output so far. */
2148 int len = list_length (globals);
2149 tree *vec = (tree *) xmalloc (sizeof (tree) * len);
2153 /* Process the decls in reverse order--earliest first.
2154 Put them into VEC from back to front, then take out from front. */
2156 for (i = 0, decl = globals; i < len; i++, decl = TREE_CHAIN (decl))
2157 vec[len - i - 1] = decl;
2159 wrapup_global_declarations (vec, len);
2161 /* This must occur after the loop to output deferred functions. Else
2162 the profiler initializer would not be emitted if all the functions
2163 in this compilation unit were deferred.
2165 output_func_start_profiler can not cause any additional functions or
2166 data to need to be output, so it need not be in the deferred function
2168 output_func_start_profiler ();
2170 check_global_declarations (vec, len);
2176 /* Write out any pending weak symbol declarations. */
2180 /* Do dbx symbols. */
2181 timevar_push (TV_SYMOUT);
2183 #ifdef DWARF2_UNWIND_INFO
2184 if (dwarf2out_do_frame ())
2185 dwarf2out_frame_finish ();
2188 (*debug_hooks->finish) (main_input_filename);
2189 timevar_pop (TV_SYMOUT);
2191 /* Output some stuff at end of file if nec. */
2193 dw2_output_indirect_constants ();
2195 end_final (dump_base_name);
2197 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2199 timevar_push (TV_DUMP);
2200 open_dump_file (DFI_bp, NULL);
2204 close_dump_file (DFI_bp, NULL, NULL_RTX);
2205 timevar_pop (TV_DUMP);
2209 ASM_FILE_END (asm_out_file);
2212 /* Attach a special .ident directive to the end of the file to identify
2213 the version of GCC which compiled this code. The format of the .ident
2214 string is patterned after the ones produced by native SVR4 compilers. */
2217 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2218 IDENT_ASM_OP, version_string);
2221 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2223 timevar_push (TV_DUMP);
2224 dump_combine_total_stats (rtl_dump_file);
2225 close_dump_file (DFI_combine, NULL, NULL_RTX);
2226 timevar_pop (TV_DUMP);
2230 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2231 and TYPE_DECL nodes.
2233 This does nothing for local (non-static) variables, unless the
2234 variable is a register variable with an ASMSPEC. In that case, or
2235 if the variable is not an automatic, it sets up the RTL and
2236 outputs any assembler code (label definition, storage allocation
2237 and initialization).
2239 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2240 the assembler symbol name to be used. TOP_LEVEL is nonzero
2241 if this declaration is not within a function. */
2244 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2246 const char *asmspec;
2250 /* Declarations of variables, and of functions defined elsewhere. */
2252 /* The most obvious approach, to put an #ifndef around where
2253 this macro is used, doesn't work since it's inside a macro call. */
2254 #ifndef ASM_FINISH_DECLARE_OBJECT
2255 #define ASM_FINISH_DECLARE_OBJECT(FILE, DECL, TOP, END)
2258 /* Forward declarations for nested functions are not "external",
2259 but we need to treat them as if they were. */
2260 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2261 || TREE_CODE (decl) == FUNCTION_DECL)
2263 timevar_push (TV_VARCONST);
2265 make_decl_rtl (decl, asmspec);
2266 /* Don't output anything
2267 when a tentative file-scope definition is seen.
2268 But at end of compilation, do output code for them. */
2269 if (at_end || !DECL_DEFER_OUTPUT (decl))
2270 assemble_variable (decl, top_level, at_end, 0);
2271 if (decl == last_assemble_variable_decl)
2273 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2276 timevar_pop (TV_VARCONST);
2278 else if (DECL_REGISTER (decl) && asmspec != 0)
2280 if (decode_reg_name (asmspec) >= 0)
2282 SET_DECL_RTL (decl, NULL_RTX);
2283 make_decl_rtl (decl, asmspec);
2287 error ("invalid register name `%s' for register variable", asmspec);
2288 DECL_REGISTER (decl) = 0;
2293 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2294 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2295 && TREE_CODE (decl) == TYPE_DECL)
2297 timevar_push (TV_SYMOUT);
2298 dbxout_symbol (decl, 0);
2299 timevar_pop (TV_SYMOUT);
2302 #ifdef SDB_DEBUGGING_INFO
2303 else if (write_symbols == SDB_DEBUG && top_level
2304 && TREE_CODE (decl) == TYPE_DECL)
2306 timevar_push (TV_SYMOUT);
2307 sdbout_symbol (decl, 0);
2308 timevar_pop (TV_SYMOUT);
2313 /* Called after finishing a record, union or enumeral type. */
2316 rest_of_type_compilation (type, toplev)
2317 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO) || defined (SDB_DEBUGGING_INFO)
2321 tree type ATTRIBUTE_UNUSED;
2322 int toplev ATTRIBUTE_UNUSED;
2325 timevar_push (TV_SYMOUT);
2326 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2327 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2328 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2330 #ifdef SDB_DEBUGGING_INFO
2331 if (write_symbols == SDB_DEBUG)
2332 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2334 #ifdef DWARF2_DEBUGGING_INFO
2335 if ((write_symbols == DWARF2_DEBUG
2336 || write_symbols == VMS_AND_DWARF2_DEBUG)
2338 dwarf2out_decl (TYPE_STUB_DECL (type));
2340 timevar_pop (TV_SYMOUT);
2343 /* This is called from finish_function (within yyparse)
2344 after each top-level definition is parsed.
2345 It is supposed to compile that function or variable
2346 and output the assembler code for it.
2347 After we return, the tree storage is freed. */
2350 rest_of_compilation (decl)
2356 int rebuild_label_notes_after_reload;
2357 int register_life_up_to_date;
2358 int cleanup_crossjump;
2360 timevar_push (TV_REST_OF_COMPILATION);
2362 /* Now that we're out of the frontend, we shouldn't have any more
2363 CONCATs anywhere. */
2364 generating_concat_p = 0;
2366 /* When processing delayed functions, prepare_function_start() won't
2367 have been run to re-initialize it. */
2368 cse_not_expected = ! optimize;
2370 /* First, make sure that NOTE_BLOCK is set correctly for each
2371 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2372 if (!cfun->x_whole_function_mode_p)
2375 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2376 tree in sensible shape. So, we just recalculate it here. */
2377 if (cfun->x_whole_function_mode_p)
2382 /* If we are reconsidering an inline function
2383 at the end of compilation, skip the stuff for making it inline. */
2385 if (DECL_SAVED_INSNS (decl) == 0)
2391 /* If this is nested inside an inlined external function, pretend
2392 it was only declared. Since we cannot inline such functions,
2393 generating code for this one is not only not necessary but will
2394 confuse some debugging output writers. */
2395 for (parent = DECL_CONTEXT (current_function_decl);
2396 parent != NULL_TREE;
2397 parent = get_containing_scope (parent))
2398 if (TREE_CODE (parent) == FUNCTION_DECL
2399 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2401 DECL_INITIAL (decl) = 0;
2402 goto exit_rest_of_compilation;
2405 /* If requested, consider whether to make this function inline. */
2406 if ((DECL_INLINE (decl) && !flag_no_inline)
2407 || flag_inline_functions)
2409 timevar_push (TV_INTEGRATION);
2410 lose = function_cannot_inline_p (decl);
2411 timevar_pop (TV_INTEGRATION);
2412 if (lose || ! optimize)
2414 if (warn_inline && DECL_INLINE (decl))
2415 warning_with_decl (decl, lose);
2416 DECL_ABSTRACT_ORIGIN (decl) = 0;
2417 /* Don't really compile an extern inline function.
2418 If we can't make it inline, pretend
2419 it was only declared. */
2420 if (DECL_EXTERNAL (decl))
2422 DECL_INITIAL (decl) = 0;
2423 goto exit_rest_of_compilation;
2427 /* ??? Note that this has the effect of making it look
2428 like "inline" was specified for a function if we choose
2429 to inline it. This isn't quite right, but it's
2430 probably not worth the trouble to fix. */
2431 inlinable = DECL_INLINE (decl) = 1;
2434 insns = get_insns ();
2436 /* Dump the rtl code if we are dumping rtl. */
2438 if (open_dump_file (DFI_rtl, decl))
2440 if (DECL_SAVED_INSNS (decl))
2441 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2442 close_dump_file (DFI_rtl, print_rtl, insns);
2445 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2446 sorts of eh initialization. Delay this until after the
2447 initial rtl dump so that we can see the original nesting. */
2448 convert_from_eh_region_ranges ();
2450 /* If function is inline, and we don't yet know whether to
2451 compile it by itself, defer decision till end of compilation.
2452 finish_compilation will call rest_of_compilation again
2453 for those functions that need to be output. Also defer those
2454 functions that we are supposed to defer. */
2457 || (DECL_INLINE (decl)
2458 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2459 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (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 ());
2553 /* Early return if there were errors. We can run afoul of our
2554 consistency checks, and there's not really much point in fixing them.
2555 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2556 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2557 || errorcount || sorrycount)
2558 goto exit_rest_of_compilation;
2560 /* We may have potential sibling or tail recursion sites. Select one
2561 (of possibly multiple) methods of performing the call. */
2562 if (flag_optimize_sibling_calls)
2564 timevar_push (TV_JUMP);
2565 open_dump_file (DFI_sibling, decl);
2567 optimize_sibling_and_tail_recursive_calls ();
2569 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2570 timevar_pop (TV_JUMP);
2573 /* Complete generation of exception handling code. */
2574 find_exception_handler_labels ();
2577 timevar_push (TV_JUMP);
2578 open_dump_file (DFI_eh, decl);
2580 finish_eh_generation ();
2582 close_dump_file (DFI_eh, print_rtl, get_insns ());
2583 timevar_pop (TV_JUMP);
2586 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2587 generation, which might create new sets. */
2588 emit_initial_value_sets ();
2591 /* If we are doing position-independent code generation, now
2592 is the time to output special prologues and epilogues.
2593 We do not want to do this earlier, because it just clutters
2594 up inline functions with meaningless insns. */
2599 insns = get_insns ();
2601 /* Copy any shared structure that should not be shared. */
2602 unshare_all_rtl (current_function_decl, insns);
2604 #ifdef SETJMP_VIA_SAVE_AREA
2605 /* This must be performed before virtual register instantiation. */
2606 if (current_function_calls_alloca)
2607 optimize_save_area_alloca (insns);
2610 /* Instantiate all virtual registers. */
2611 instantiate_virtual_regs (current_function_decl, insns);
2613 open_dump_file (DFI_jump, decl);
2615 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2616 are initialized and to compute whether control can drop off the end
2619 timevar_push (TV_JUMP);
2620 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2621 before jump optimization switches branch directions. */
2622 expected_value_to_br_prob ();
2624 reg_scan (insns, max_reg_num (), 0);
2625 rebuild_jump_labels (insns);
2626 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2627 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP);
2629 /* CFG is no longer maintained up-to-date. */
2630 free_bb_for_insn ();
2631 copy_loop_headers (insns);
2632 purge_line_number_notes (insns);
2634 timevar_pop (TV_JUMP);
2636 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2637 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2639 close_dump_file (DFI_jump, print_rtl, insns);
2640 goto exit_rest_of_compilation;
2643 /* Long term, this should probably move before the jump optimizer too,
2644 but I didn't want to disturb the rtl_dump_and_exit and related
2645 stuff at this time. */
2646 if (optimize > 0 && flag_ssa)
2648 /* Convert to SSA form. */
2650 timevar_push (TV_TO_SSA);
2651 open_dump_file (DFI_ssa, decl);
2653 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2654 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2657 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2658 timevar_pop (TV_TO_SSA);
2660 /* Perform sparse conditional constant propagation, if requested. */
2663 timevar_push (TV_SSA_CCP);
2664 open_dump_file (DFI_ssa_ccp, decl);
2668 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2669 timevar_pop (TV_SSA_CCP);
2672 /* It would be useful to cleanup the CFG at this point, but block
2673 merging and possibly other transformations might leave a PHI
2674 node in the middle of a basic block, which is a strict no-no. */
2676 /* The SSA implementation uses basic block numbers in its phi
2677 nodes. Thus, changing the control-flow graph or the basic
2678 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2679 may cause problems. */
2683 /* Remove dead code. */
2685 timevar_push (TV_SSA_DCE);
2686 open_dump_file (DFI_ssa_dce, decl);
2688 insns = get_insns ();
2689 ssa_eliminate_dead_code();
2691 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2692 timevar_pop (TV_SSA_DCE);
2695 /* Convert from SSA form. */
2697 timevar_push (TV_FROM_SSA);
2698 open_dump_file (DFI_ussa, decl);
2700 convert_from_ssa ();
2701 /* New registers have been created. Rescan their usage. */
2702 reg_scan (insns, max_reg_num (), 1);
2704 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2705 timevar_pop (TV_FROM_SSA);
2708 /* CFG is no longer maintained up-to-date. */
2709 free_bb_for_insn ();
2712 timevar_push (TV_JUMP);
2716 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2717 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP
2718 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2720 /* ??? Run if-conversion before delete_null_pointer_checks,
2721 since the later does not preserve the CFG. This should
2722 be changed -- no since converting if's that are going to
2724 timevar_push (TV_IFCVT);
2726 timevar_pop (TV_IFCVT);
2728 /* CFG is no longer maintained up-to-date. */
2729 free_bb_for_insn ();
2730 /* Try to identify useless null pointer tests and delete them. */
2731 if (flag_delete_null_pointer_checks)
2732 delete_null_pointer_checks (insns);
2735 /* Jump optimization, and the removal of NULL pointer checks, may
2736 have reduced the number of instructions substantially. CSE, and
2737 future passes, allocate arrays whose dimensions involve the
2738 maximum instruction UID, so if we can reduce the maximum UID
2739 we'll save big on memory. */
2740 renumber_insns (rtl_dump_file);
2741 timevar_pop (TV_JUMP);
2743 close_dump_file (DFI_jump, print_rtl, insns);
2747 /* Perform common subexpression elimination.
2748 Nonzero value from `cse_main' means that jumps were simplified
2749 and some code may now be unreachable, so do
2750 jump optimization again. */
2754 open_dump_file (DFI_cse, decl);
2755 timevar_push (TV_CSE);
2757 reg_scan (insns, max_reg_num (), 1);
2759 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2761 /* If we are not running more CSE passes, then we are no longer
2762 expecting CSE to be run. But always rerun it in a cheap mode. */
2763 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2765 if (tem || optimize > 1)
2767 timevar_push (TV_JUMP);
2768 rebuild_jump_labels (insns);
2769 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2770 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2771 timevar_pop (TV_JUMP);
2772 /* CFG is no longer maintained up-to-date. */
2773 free_bb_for_insn ();
2776 /* Run this after jump optmizations remove all the unreachable code
2777 so that unreachable code will not keep values live. */
2778 delete_trivially_dead_insns (insns, max_reg_num (), 0);
2780 /* Try to identify useless null pointer tests and delete them. */
2781 if (flag_delete_null_pointer_checks || flag_thread_jumps)
2783 timevar_push (TV_JUMP);
2784 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2786 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP
2787 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2789 if (flag_delete_null_pointer_checks)
2790 delete_null_pointer_checks (insns);
2791 /* CFG is no longer maintained up-to-date. */
2792 free_bb_for_insn ();
2793 timevar_pop (TV_JUMP);
2796 /* The second pass of jump optimization is likely to have
2797 removed a bunch more instructions. */
2798 renumber_insns (rtl_dump_file);
2800 timevar_pop (TV_CSE);
2801 close_dump_file (DFI_cse, print_rtl, insns);
2804 open_dump_file (DFI_addressof, decl);
2806 purge_addressof (insns);
2807 reg_scan (insns, max_reg_num (), 1);
2809 close_dump_file (DFI_addressof, print_rtl, insns);
2813 /* Perform global cse. */
2815 if (optimize > 0 && flag_gcse)
2817 int save_csb, save_cfj;
2820 timevar_push (TV_GCSE);
2821 open_dump_file (DFI_gcse, decl);
2823 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2824 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2825 tem = gcse_main (insns, rtl_dump_file);
2826 rebuild_jump_labels (insns);
2828 save_csb = flag_cse_skip_blocks;
2829 save_cfj = flag_cse_follow_jumps;
2830 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2832 /* CFG is no longer maintained up-to-date. */
2833 free_bb_for_insn ();
2834 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2836 if (flag_expensive_optimizations)
2838 timevar_push (TV_CSE);
2839 reg_scan (insns, max_reg_num (), 1);
2840 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2841 timevar_pop (TV_CSE);
2842 cse_not_expected = !flag_rerun_cse_after_loop;
2845 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2846 things up. Then possibly re-run CSE again. */
2850 timevar_push (TV_JUMP);
2851 rebuild_jump_labels (insns);
2852 delete_trivially_dead_insns (insns, max_reg_num (), 0);
2853 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2854 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2855 /* CFG is no longer maintained up-to-date. */
2856 free_bb_for_insn ();
2857 timevar_pop (TV_JUMP);
2859 if (flag_expensive_optimizations)
2861 timevar_push (TV_CSE);
2862 reg_scan (insns, max_reg_num (), 1);
2863 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2864 timevar_pop (TV_CSE);
2868 close_dump_file (DFI_gcse, print_rtl, insns);
2869 timevar_pop (TV_GCSE);
2872 flag_cse_skip_blocks = save_csb;
2873 flag_cse_follow_jumps = save_cfj;
2876 /* Move constant computations out of loops. */
2880 timevar_push (TV_LOOP);
2881 open_dump_file (DFI_loop, decl);
2882 free_bb_for_insn ();
2884 if (flag_rerun_loop_opt)
2886 cleanup_barriers ();
2888 /* We only want to perform unrolling once. */
2889 loop_optimize (insns, rtl_dump_file, LOOP_FIRST_PASS);
2891 /* The first call to loop_optimize makes some instructions
2892 trivially dead. We delete those instructions now in the
2893 hope that doing so will make the heuristics in loop work
2894 better and possibly speed up compilation. */
2895 delete_trivially_dead_insns (insns, max_reg_num (), 0);
2897 /* The regscan pass is currently necessary as the alias
2898 analysis code depends on this information. */
2899 reg_scan (insns, max_reg_num (), 1);
2901 cleanup_barriers ();
2902 loop_optimize (insns, rtl_dump_file,
2903 (flag_unroll_loops ? LOOP_UNROLL : 0) | LOOP_BCT
2904 | (flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0));
2906 close_dump_file (DFI_loop, print_rtl, insns);
2907 timevar_pop (TV_LOOP);
2914 timevar_push (TV_CSE2);
2915 open_dump_file (DFI_cse2, decl);
2917 if (flag_rerun_cse_after_loop)
2919 /* Running another jump optimization pass before the second
2920 cse pass sometimes simplifies the RTL enough to allow
2921 the second CSE pass to do a better job. Jump_optimize can change
2922 max_reg_num so we must rerun reg_scan afterwards.
2923 ??? Rework to not call reg_scan so often. */
2924 timevar_push (TV_JUMP);
2926 /* The previous call to loop_optimize makes some instructions
2927 trivially dead. We delete those instructions now in the
2928 hope that doing so will make the heuristics in jump work
2929 better and possibly speed up compilation. */
2930 delete_trivially_dead_insns (insns, max_reg_num (), 0);
2932 reg_scan (insns, max_reg_num (), 0);
2934 timevar_push (TV_IFCVT);
2936 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2937 cleanup_cfg (CLEANUP_EXPENSIVE);
2940 timevar_pop(TV_IFCVT);
2942 timevar_pop (TV_JUMP);
2944 /* CFG is no longer maintained up-to-date. */
2945 free_bb_for_insn ();
2946 reg_scan (insns, max_reg_num (), 0);
2947 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
2951 timevar_push (TV_JUMP);
2952 rebuild_jump_labels (insns);
2953 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2954 cleanup_cfg (CLEANUP_EXPENSIVE);
2955 /* CFG is no longer maintained up-to-date. */
2956 free_bb_for_insn ();
2957 timevar_pop (TV_JUMP);
2961 close_dump_file (DFI_cse2, print_rtl, insns);
2962 timevar_pop (TV_CSE2);
2967 cse_not_expected = 1;
2971 /* Do control and data flow analysis; wrote some of the results to
2974 timevar_push (TV_FLOW);
2975 open_dump_file (DFI_cfg, decl);
2977 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2978 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0)
2979 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2980 check_function_return_warnings ();
2982 /* It may make more sense to mark constant functions after dead code is
2983 eliminated by life_analyzis, but we need to do it early, as -fprofile-arcs
2984 may insert code making function non-constant, but we still must consider
2985 it as constant, otherwise -fbranch-probabilities will not read data back.
2987 life_analyzis rarely eliminates modification of external memory.
2989 mark_constant_function ();
2991 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
2993 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2995 timevar_push (TV_BRANCH_PROB);
2996 open_dump_file (DFI_bp, decl);
3000 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
3001 timevar_pop (TV_BRANCH_PROB);
3004 open_dump_file (DFI_life, decl);
3009 /* Discover and record the loop depth at the head of each basic
3010 block. The loop infrastructure does the real job for us. */
3011 flow_loops_find (&loops, LOOP_TREE);
3013 /* Estimate using heuristics if no profiling info is available. */
3014 if (flag_guess_branch_prob)
3015 estimate_probability (&loops);
3018 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
3020 flow_loops_free (&loops);
3022 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3023 timevar_pop (TV_FLOW);
3027 if (warn_uninitialized || extra_warnings)
3029 uninitialized_vars_warning (DECL_INITIAL (decl));
3031 setjmp_args_warning ();
3036 if (initialize_uninitialized_subregs ())
3038 /* Insns were inserted, so things might look a bit different. */
3039 insns = get_insns ();
3040 life_analysis (insns, rtl_dump_file,
3041 (PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES));
3045 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3049 /* If -opt, try combining insns through substitution. */
3053 int rebuild_jump_labels_after_combine = 0;
3055 timevar_push (TV_COMBINE);
3056 open_dump_file (DFI_combine, decl);
3058 rebuild_jump_labels_after_combine
3059 = combine_instructions (insns, max_reg_num ());
3061 /* Always purge dead edges, as we may eliminate an insn throwing
3063 rebuild_jump_labels_after_combine |= purge_all_dead_edges (true);
3065 /* Combining insns may have turned an indirect jump into a
3066 direct jump. Rebuid the JUMP_LABEL fields of jumping
3068 if (rebuild_jump_labels_after_combine)
3070 timevar_push (TV_JUMP);
3071 rebuild_jump_labels (insns);
3072 timevar_pop (TV_JUMP);
3074 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3077 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3078 timevar_pop (TV_COMBINE);
3083 /* Rerun if-conversion, as combine may have simplified things enough to
3084 now meet sequence length restrictions. */
3087 timevar_push (TV_IFCVT);
3088 open_dump_file (DFI_ce, decl);
3094 close_dump_file (DFI_ce, print_rtl_with_bb, insns);
3095 timevar_pop (TV_IFCVT);
3098 /* Register allocation pre-pass, to reduce number of moves
3099 necessary for two-address machines. */
3100 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3102 timevar_push (TV_REGMOVE);
3103 open_dump_file (DFI_regmove, decl);
3105 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3107 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3108 timevar_pop (TV_REGMOVE);
3113 /* Do unconditional splitting before register allocation to allow machine
3114 description to add extra information not needed previously. */
3115 split_all_insns (1);
3117 /* Any of the several passes since flow1 will have munged register
3118 lifetime data a bit. */
3119 register_life_up_to_date = 0;
3121 #ifdef OPTIMIZE_MODE_SWITCHING
3122 timevar_push (TV_MODE_SWITCH);
3125 if (optimize_mode_switching (NULL))
3127 /* We did work, and so had to regenerate global life information.
3128 Take advantage of this and don't re-recompute register life
3129 information below. */
3130 register_life_up_to_date = 1;
3134 timevar_pop (TV_MODE_SWITCH);
3137 timevar_push (TV_SCHED);
3139 #ifdef INSN_SCHEDULING
3141 /* Print function header into sched dump now
3142 because doing the sched analysis makes some of the dump. */
3143 if (optimize > 0 && flag_schedule_insns)
3145 open_dump_file (DFI_sched, decl);
3147 /* Do control and data sched analysis,
3148 and write some of the results to dump file. */
3150 schedule_insns (rtl_dump_file);
3152 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3154 /* Register lifetime information was updated as part of verifying
3156 register_life_up_to_date = 1;
3159 timevar_pop (TV_SCHED);
3163 /* Determine if the current function is a leaf before running reload
3164 since this can impact optimizations done by the prologue and
3165 epilogue thus changing register elimination offsets. */
3166 current_function_is_leaf = leaf_function_p ();
3168 timevar_push (TV_LOCAL_ALLOC);
3169 open_dump_file (DFI_lreg, decl);
3171 /* Allocate pseudo-regs that are used only within 1 basic block.
3173 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3174 jump optimizer after register allocation and reloading are finished. */
3176 if (! register_life_up_to_date)
3177 recompute_reg_usage (insns, ! optimize_size);
3179 /* Allocate the reg_renumber array. */
3180 allocate_reg_info (max_regno, FALSE, TRUE);
3182 /* And the reg_equiv_memory_loc array. */
3183 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3185 allocate_initial_values (reg_equiv_memory_loc);
3187 regclass (insns, max_reg_num (), rtl_dump_file);
3188 rebuild_label_notes_after_reload = local_alloc ();
3190 timevar_pop (TV_LOCAL_ALLOC);
3192 if (dump_file[DFI_lreg].enabled)
3194 timevar_push (TV_DUMP);
3196 dump_flow_info (rtl_dump_file);
3197 dump_local_alloc (rtl_dump_file);
3199 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3200 timevar_pop (TV_DUMP);
3205 timevar_push (TV_GLOBAL_ALLOC);
3206 open_dump_file (DFI_greg, decl);
3208 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3209 pass fixing up any insns that are invalid. */
3212 failure = global_alloc (rtl_dump_file);
3215 build_insn_chain (insns);
3216 failure = reload (insns, 0);
3219 timevar_pop (TV_GLOBAL_ALLOC);
3221 if (dump_file[DFI_greg].enabled)
3223 timevar_push (TV_DUMP);
3225 dump_global_regs (rtl_dump_file);
3227 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3228 timevar_pop (TV_DUMP);
3232 goto exit_rest_of_compilation;
3236 open_dump_file (DFI_postreload, decl);
3238 /* Do a very simple CSE pass over just the hard registers. */
3241 timevar_push (TV_RELOAD_CSE_REGS);
3242 reload_cse_regs (insns);
3243 timevar_pop (TV_RELOAD_CSE_REGS);
3246 /* Register allocation and reloading may have turned an indirect jump into
3247 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3248 jumping instructions. */
3249 if (rebuild_label_notes_after_reload)
3251 timevar_push (TV_JUMP);
3253 rebuild_jump_labels (insns);
3255 timevar_pop (TV_JUMP);
3258 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3260 /* Re-create the death notes which were deleted during reload. */
3261 timevar_push (TV_FLOW2);
3262 open_dump_file (DFI_flow2, decl);
3264 #ifdef ENABLE_CHECKING
3265 verify_flow_info ();
3268 /* If optimizing, then go ahead and split insns now. */
3270 split_all_insns (0);
3272 cleanup_cfg (optimize ? CLEANUP_EXPENSIVE : 0);
3274 /* On some machines, the prologue and epilogue code, or parts thereof,
3275 can be represented as RTL. Doing so lets us schedule insns between
3276 it and the rest of the code and also allows delayed branch
3277 scheduling to operate in the epilogue. */
3278 thread_prologue_and_epilogue_insns (insns);
3280 /* Cross-jumping is O(N^3) on the number of edges, thus trying to
3281 perform cross-jumping on flow graphs which have a high connectivity
3282 will take a long time. This is similar to the test to disable GCSE. */
3283 cleanup_crossjump = CLEANUP_CROSSJUMP;
3284 if (n_basic_blocks > 1000 && n_edges / n_basic_blocks >= 20)
3286 if (optimize && warn_disabled_optimization)
3287 warning ("crossjump disabled: %d > 1000 basic blocks and %d >= 20 edges/basic block",
3288 n_basic_blocks, n_edges / n_basic_blocks);
3289 cleanup_crossjump = 0;
3294 cleanup_cfg (CLEANUP_EXPENSIVE | cleanup_crossjump);
3295 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3297 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3298 even for machines with possibly nonzero RETURN_POPS_ARGS
3299 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3300 push instructions will have popping returns. */
3301 #ifndef PUSH_ROUNDING
3302 if (!ACCUMULATE_OUTGOING_ARGS)
3304 combine_stack_adjustments ();
3309 flow2_completed = 1;
3311 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3312 timevar_pop (TV_FLOW2);
3314 #ifdef HAVE_peephole2
3315 if (optimize > 0 && flag_peephole2)
3317 timevar_push (TV_PEEPHOLE2);
3318 open_dump_file (DFI_peephole2, decl);
3320 peephole2_optimize (rtl_dump_file);
3322 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3323 timevar_pop (TV_PEEPHOLE2);
3327 if (optimize > 0 && (flag_rename_registers || flag_cprop_registers))
3329 timevar_push (TV_RENAME_REGISTERS);
3330 open_dump_file (DFI_rnreg, decl);
3332 if (flag_rename_registers)
3333 regrename_optimize ();
3334 if (flag_cprop_registers)
3335 copyprop_hardreg_forward ();
3337 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3338 timevar_pop (TV_RENAME_REGISTERS);
3343 timevar_push (TV_IFCVT2);
3344 open_dump_file (DFI_ce2, decl);
3348 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3349 timevar_pop (TV_IFCVT2);
3353 split_all_insns (1);
3356 #ifdef INSN_SCHEDULING
3357 if (optimize > 0 && flag_schedule_insns_after_reload)
3359 timevar_push (TV_SCHED2);
3360 open_dump_file (DFI_sched2, decl);
3362 /* Do control and data sched analysis again,
3363 and write some more of the results to dump file. */
3365 split_all_insns (1);
3367 schedule_insns (rtl_dump_file);
3369 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3370 timevar_pop (TV_SCHED2);
3376 #ifdef LEAF_REGISTERS
3377 current_function_uses_only_leaf_regs
3378 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3382 timevar_push (TV_REG_STACK);
3383 open_dump_file (DFI_stack, decl);
3385 reg_to_stack (insns, rtl_dump_file);
3387 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3388 timevar_pop (TV_REG_STACK);
3394 timevar_push (TV_REORDER_BLOCKS);
3395 open_dump_file (DFI_bbro, decl);
3397 /* Last attempt to optimize CFG, as life analysis possibly removed
3398 some instructions. Note that we can't rerun crossjump at this
3399 point, because it can turn a switch into a direct branch, which
3400 can leave the tablejump address calculation in the code, which
3401 can lead to referencing an undefined label. */
3402 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3403 if (flag_reorder_blocks)
3405 reorder_basic_blocks ();
3406 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3409 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3410 timevar_pop (TV_REORDER_BLOCKS);
3412 compute_alignments ();
3414 /* CFG is no longer maintained up-to-date. */
3415 free_bb_for_insn ();
3417 /* If a machine dependent reorganization is needed, call it. */
3418 #ifdef MACHINE_DEPENDENT_REORG
3419 timevar_push (TV_MACH_DEP);
3420 open_dump_file (DFI_mach, decl);
3422 MACHINE_DEPENDENT_REORG (insns);
3424 close_dump_file (DFI_mach, print_rtl, insns);
3425 timevar_pop (TV_MACH_DEP);
3430 purge_line_number_notes (insns);
3431 cleanup_barriers ();
3433 /* If a scheduling pass for delayed branches is to be done,
3434 call the scheduling code. */
3437 if (optimize > 0 && flag_delayed_branch)
3439 timevar_push (TV_DBR_SCHED);
3440 open_dump_file (DFI_dbr, decl);
3442 dbr_schedule (insns, rtl_dump_file);
3444 close_dump_file (DFI_dbr, print_rtl, insns);
3445 timevar_pop (TV_DBR_SCHED);
3451 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3452 timevar_push (TV_SHORTEN_BRANCH);
3453 split_all_insns_noflow ();
3454 timevar_pop (TV_SHORTEN_BRANCH);
3457 convert_to_eh_region_ranges ();
3459 /* Shorten branches. */
3460 timevar_push (TV_SHORTEN_BRANCH);
3461 shorten_branches (get_insns ());
3462 timevar_pop (TV_SHORTEN_BRANCH);
3464 current_function_nothrow = nothrow_function_p ();
3465 if (current_function_nothrow)
3466 /* Now we know that this can't throw; set the flag for the benefit
3467 of other functions later in this translation unit. */
3468 TREE_NOTHROW (current_function_decl) = 1;
3470 /* Now turn the rtl into assembler code. */
3472 timevar_push (TV_FINAL);
3477 /* Get the function's name, as described by its RTL. This may be
3478 different from the DECL_NAME name used in the source file. */
3480 x = DECL_RTL (decl);
3481 if (GET_CODE (x) != MEM)
3484 if (GET_CODE (x) != SYMBOL_REF)
3486 fnname = XSTR (x, 0);
3488 assemble_start_function (decl, fnname);
3489 final_start_function (insns, asm_out_file, optimize);
3490 final (insns, asm_out_file, optimize, 0);
3491 final_end_function ();
3493 #ifdef IA64_UNWIND_INFO
3494 /* ??? The IA-64 ".handlerdata" directive must be issued before
3495 the ".endp" directive that closes the procedure descriptor. */
3496 output_function_exception_table ();
3499 assemble_end_function (decl, fnname);
3501 #ifndef IA64_UNWIND_INFO
3502 /* Otherwise, it feels unclean to switch sections in the middle. */
3503 output_function_exception_table ();
3507 fflush (asm_out_file);
3509 /* Release all memory allocated by flow. */
3510 free_basic_block_vars (0);
3512 /* Release all memory held by regsets now. */
3513 regset_release_memory ();
3515 timevar_pop (TV_FINAL);
3519 /* Write DBX symbols if requested. */
3521 /* Note that for those inline functions where we don't initially
3522 know for certain that we will be generating an out-of-line copy,
3523 the first invocation of this routine (rest_of_compilation) will
3524 skip over this code by doing a `goto exit_rest_of_compilation;'.
3525 Later on, finish_compilation will call rest_of_compilation again
3526 for those inline functions that need to have out-of-line copies
3527 generated. During that call, we *will* be routed past here. */
3529 timevar_push (TV_SYMOUT);
3530 (*debug_hooks->function_decl) (decl);
3531 timevar_pop (TV_SYMOUT);
3533 exit_rest_of_compilation:
3535 /* In case the function was not output,
3536 don't leave any temporary anonymous types
3537 queued up for sdb output. */
3538 #ifdef SDB_DEBUGGING_INFO
3539 if (write_symbols == SDB_DEBUG)
3540 sdbout_types (NULL_TREE);
3543 reload_completed = 0;
3544 flow2_completed = 0;
3547 timevar_push (TV_FINAL);
3549 /* Clear out the insn_length contents now that they are no
3551 init_insn_lengths ();
3553 /* Clear out the real_constant_chain before some of the rtx's
3554 it runs through become garbage. */
3555 clear_const_double_mem ();
3557 /* Show no temporary slots allocated. */
3560 free_basic_block_vars (0);
3561 free_bb_for_insn ();
3563 timevar_pop (TV_FINAL);
3565 /* Make sure volatile mem refs aren't considered valid operands for
3566 arithmetic insns. We must call this here if this is a nested inline
3567 function, since the above code leaves us in the init_recog state
3568 (from final.c), and the function context push/pop code does not
3569 save/restore volatile_ok.
3571 ??? Maybe it isn't necessary for expand_start_function to call this
3572 anymore if we do it here? */
3574 init_recog_no_volatile ();
3576 /* We're done with this function. Free up memory if we can. */
3577 free_after_parsing (cfun);
3578 if (! DECL_DEFER_OUTPUT (decl))
3580 free_after_compilation (cfun);
3582 /* Clear integrate.c's pointer to the cfun structure we just
3584 DECL_SAVED_INSNS (decl) = 0;
3590 timevar_pop (TV_REST_OF_COMPILATION);
3600 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3601 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3602 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3603 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3604 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3605 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"));
3607 for (i = ARRAY_SIZE (f_options); i--;)
3609 const char *description = f_options[i].description;
3611 if (description != NULL && * description != 0)
3612 printf (" -f%-21s %s\n",
3613 f_options[i].string, _(description));
3616 printf (_(" -O[number] Set optimization level to [number]\n"));
3617 printf (_(" -Os Optimize for space rather than speed\n"));
3618 for (i = LAST_PARAM; i--;)
3620 const char *description = compiler_params[i].help;
3621 const int length = 21-strlen(compiler_params[i].option);
3623 if (description != NULL && * description != 0)
3624 printf (" --param %s=<value>%.*s%s\n",
3625 compiler_params[i].option,
3626 length > 0 ? length : 1, " ",
3629 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3630 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3631 printf (_(" -w Suppress warnings\n"));
3632 printf (_(" -W Enable extra warnings\n"));
3634 for (i = ARRAY_SIZE (W_options); i--;)
3636 const char *description = W_options[i].description;
3638 if (description != NULL && * description != 0)
3639 printf (" -W%-21s %s\n",
3640 W_options[i].string, _(description));
3643 printf (_(" -Wunused Enable unused warnings\n"));
3644 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3645 printf (_(" -p Enable function profiling\n"));
3646 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER)
3647 printf (_(" -a Enable block profiling \n"));
3649 #if defined (BLOCK_PROFILER) || defined (FUNCTION_BLOCK_PROFILER) || defined FUNCTION_BLOCK_PROFILER_EXIT
3650 printf (_(" -ax Enable jump profiling \n"));
3652 printf (_(" -o <file> Place output into <file> \n"));
3654 -G <number> Put global and static data smaller than <number>\n\
3655 bytes into a special section (on some targets)\n"));
3657 for (i = ARRAY_SIZE (debug_args); i--;)
3659 if (debug_args[i].description != NULL)
3660 printf (" -g%-21s %s\n",
3661 debug_args[i].arg, _(debug_args[i].description));
3664 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3665 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3666 printf (_(" -version Display the compiler's version\n"));
3667 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3668 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3669 #if defined INSN_SCHEDULING
3670 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3672 printf (_(" --help Display this information\n"));
3677 /* Display descriptions of language specific options.
3678 If there is no description, note that there is an undocumented option.
3679 If the description is empty, do not display anything. (This allows
3680 options to be deliberately undocumented, for whatever reason).
3681 If the option string is missing, then this is a marker, indicating
3682 that the description string is in fact the name of a language, whose
3683 language specific options are to follow. */
3685 if (ARRAY_SIZE (documented_lang_options) > 1)
3687 printf (_("\nLanguage specific options:\n"));
3689 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3691 const char *description = documented_lang_options[i].description;
3692 const char *option = documented_lang_options[i].option;
3694 if (description == NULL)
3699 printf (_(" %-23.23s [undocumented]\n"), option);
3701 else if (*description == 0)
3703 else if (option == NULL)
3707 (_("\nThere are undocumented %s specific options as well.\n"),
3711 printf (_("\n Options for %s:\n"), description);
3716 printf (" %-23.23s %s\n", option, _(description));
3721 printf (_("\nThere are undocumented %s specific options as well.\n"),
3724 display_target_options ();
3728 display_target_options ()
3731 static bool displayed = false;
3733 /* Avoid double printing for --help --target-help. */
3738 if (ARRAY_SIZE (target_switches) > 1
3739 #ifdef TARGET_OPTIONS
3740 || ARRAY_SIZE (target_options) > 1
3748 printf (_("\nTarget specific options:\n"));
3750 for (i = ARRAY_SIZE (target_switches); i--;)
3752 const char *option = target_switches[i].name;
3753 const char *description = target_switches[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));
3768 #ifdef TARGET_OPTIONS
3769 for (i = ARRAY_SIZE (target_options); i--;)
3771 const char *option = target_options[i].prefix;
3772 const char *description = target_options[i].description;
3774 if (option == NULL || *option == 0)
3776 else if (description == NULL)
3781 printf (_(" -m%-23.23s [undocumented]\n"), option);
3783 else if (* description != 0)
3784 doc += printf (" -m%-23.23s %s\n", option, _(description));
3790 printf (_("\nThere are undocumented target specific options as well.\n"));
3792 printf (_(" They exist, but they are not documented.\n"));
3797 /* Parse a -d... command line switch. */
3800 decode_d_option (arg)
3809 for (i = 0; i < (int) DFI_MAX; ++i)
3810 dump_file[i].enabled = 1;
3816 flag_print_asm_name = 1;
3819 flag_dump_rtl_in_asm = 1;
3820 flag_print_asm_name = 1;
3823 graph_dump_format = vcg;
3826 rtl_dump_and_exit = 1;
3829 (*lang_hooks.set_yydebug) (1);
3831 case 'D': /* These are handled by the preprocessor. */
3837 for (i = 0; i < (int) DFI_MAX; ++i)
3838 if (c == dump_file[i].debug_switch)
3840 dump_file[i].enabled = 1;
3845 warning ("unrecognized gcc debugging option: %c", c);
3850 /* Parse a -f... command line switch. ARG is the value after the -f.
3851 It is safe to access 'ARG - 2' to generate the full switch name.
3852 Return the number of strings consumed. */
3855 decode_f_option (arg)
3859 const char *option_value = NULL;
3861 /* Search for the option in the table of binary f options. */
3862 for (j = ARRAY_SIZE (f_options); j--;)
3864 if (!strcmp (arg, f_options[j].string))
3866 *f_options[j].variable = f_options[j].on_value;
3870 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3871 && ! strcmp (arg + 3, f_options[j].string))
3873 *f_options[j].variable = ! f_options[j].on_value;
3878 if (!strcmp (arg, "fast-math"))
3879 set_fast_math_flags ();
3880 else if (!strcmp (arg, "no-fast-math"))
3881 set_no_fast_math_flags ();
3882 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
3883 || (option_value = skip_leading_substring (arg, "inline-limit=")))
3886 read_integral_parameter (option_value, arg - 2,
3888 set_param_value ("max-inline-insns", val);
3890 #ifdef INSN_SCHEDULING
3891 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
3892 fix_sched_param ("verbose", option_value);
3894 else if ((option_value = skip_leading_substring (arg, "fixed-")))
3895 fix_register (option_value, 1, 1);
3896 else if ((option_value = skip_leading_substring (arg, "call-used-")))
3897 fix_register (option_value, 0, 1);
3898 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
3899 fix_register (option_value, 0, 0);
3900 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
3901 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
3902 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
3904 = read_integral_parameter (option_value, arg - 2, align_functions);
3905 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
3906 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
3907 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
3909 = read_integral_parameter (option_value, arg - 2, align_labels);
3910 else if ((option_value
3911 = skip_leading_substring (arg, "stack-limit-register=")))
3913 int reg = decode_reg_name (option_value);
3915 error ("unrecognized register name `%s'", option_value);
3917 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
3919 else if ((option_value
3920 = skip_leading_substring (arg, "stack-limit-symbol=")))
3923 nm = ggc_strdup (option_value);
3924 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
3926 else if ((option_value
3927 = skip_leading_substring (arg, "message-length=")))
3928 output_set_maximum_length
3929 (&global_dc->buffer, read_integral_parameter
3930 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
3931 else if ((option_value
3932 = skip_leading_substring (arg, "diagnostics-show-location=")))
3934 if (!strcmp (option_value, "once"))
3935 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
3936 else if (!strcmp (option_value, "every-line"))
3937 diagnostic_prefixing_rule (global_dc)
3938 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
3940 error ("unrecognized option `%s'", arg - 2);
3942 else if (!strcmp (arg, "no-stack-limit"))
3943 stack_limit_rtx = NULL_RTX;
3944 else if (!strcmp (arg, "preprocessed"))
3945 /* Recognise this switch but do nothing. This prevents warnings
3946 about an unrecognized switch if cpplib has not been linked in. */
3954 /* Parse a -W... command line switch. ARG is the value after the -W.
3955 It is safe to access 'ARG - 2' to generate the full switch name.
3956 Return the number of strings consumed. */
3959 decode_W_option (arg)
3962 const char *option_value = NULL;
3965 /* Search for the option in the table of binary W options. */
3967 for (j = ARRAY_SIZE (W_options); j--;)
3969 if (!strcmp (arg, W_options[j].string))
3971 *W_options[j].variable = W_options[j].on_value;
3975 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
3976 && ! strcmp (arg + 3, W_options[j].string))
3978 *W_options[j].variable = ! W_options[j].on_value;
3983 if ((option_value = skip_leading_substring (arg, "id-clash-")))
3984 warning ("-Wid-clash-LEN is no longer supported");
3985 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
3987 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
3989 warn_larger_than = larger_than_size != -1;
3991 else if (!strcmp (arg, "unused"))
3995 else if (!strcmp (arg, "no-unused"))
4005 /* Parse a -g... command line switch. ARG is the value after the -g.
4006 It is safe to access 'ARG - 2' to generate the full switch name.
4007 Return the number of strings consumed. */
4010 decode_g_option (arg)
4013 static unsigned level=0;
4014 /* A lot of code assumes write_symbols == NO_DEBUG if the
4015 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4016 of what debugging type has been selected). This records the
4017 selected type. It is an error to specify more than one
4019 static enum debug_info_type selected_debug_type = NO_DEBUG;
4020 /* Non-zero if debugging format has been explicitly set.
4021 -g and -ggdb don't explicitly set the debugging format so
4022 -gdwarf -g3 is equivalent to -gdwarf3. */
4023 static int type_explicitly_set_p = 0;
4024 /* Indexed by enum debug_info_type. */
4025 static const char *const debug_type_names[] =
4027 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4030 /* The maximum admissible debug level value. */
4031 static const unsigned max_debug_level = 3;
4033 /* Look up ARG in the table. */
4034 for (da = debug_args; da->arg; da++)
4036 const int da_len = strlen (da->arg);
4038 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4040 enum debug_info_type type = da->debug_type;
4041 const char *p = arg + da_len;
4043 if (*p && ! ISDIGIT (*p))
4046 /* A debug flag without a level defaults to level 2.
4047 Note we do not want to call read_integral_parameter
4048 for that case since it will call atoi which
4051 ??? We may want to generalize the interface to
4052 read_integral_parameter to better handle this case
4053 if this case shows up often. */
4055 level = read_integral_parameter (p, 0, max_debug_level + 1);
4057 level = (level == 0) ? 2 : level;
4059 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4061 error ("use -gdwarf -g%d for DWARF v1, level %d",
4064 error ("use -gdwarf-2 for DWARF v2");
4067 if (level > max_debug_level)
4070 ignoring option `%s' due to invalid debug level specification",
4072 level = debug_info_level;
4075 if (type == NO_DEBUG)
4077 type = PREFERRED_DEBUGGING_TYPE;
4079 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4081 #ifdef DWARF2_DEBUGGING_INFO
4082 type = DWARF2_DEBUG;
4084 #ifdef DBX_DEBUGGING_INFO
4091 if (type == NO_DEBUG)
4092 warning ("`%s': unknown or unsupported -g option", arg - 2);
4094 /* Does it conflict with an already selected type? */
4095 if (type_explicitly_set_p
4096 /* -g/-ggdb don't conflict with anything. */
4097 && da->debug_type != NO_DEBUG
4098 && type != selected_debug_type)
4099 warning ("`%s' ignored, conflicts with `-g%s'",
4100 arg - 2, debug_type_names[(int) selected_debug_type]);
4103 /* If the format has already been set, -g/-ggdb
4104 only change the debug level. */
4105 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4106 /* Don't change debugging type. */
4110 selected_debug_type = type;
4111 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4114 write_symbols = (level == 0
4116 : selected_debug_type);
4117 use_gnu_debug_info_extensions = da->use_extensions_p;
4118 debug_info_level = (enum debug_info_level) level;
4131 /* Decode the first argument in the argv as a language-independent option.
4132 Return the number of strings consumed. */
4135 independent_decode_option (argc, argv)
4139 char *arg = argv[0];
4141 if (arg[0] != '-' || arg[1] == 0)
4153 if (!strcmp (arg, "-help"))
4156 exit_after_options = 1;
4159 if (!strcmp (arg, "-target-help"))
4161 display_target_options ();
4162 exit_after_options = 1;
4165 if (!strcmp (arg, "-version"))
4167 print_version (stderr, "");
4168 exit_after_options = 1;
4171 /* Handle '--param <name>=<value>'. */
4172 if (strcmp (arg, "-param") == 0)
4178 error ("-param option missing argument");
4182 /* Get the '<name>=<value>' parameter. */
4184 /* Look for the `='. */
4185 equal = strchr (arg, '=');
4187 error ("invalid --param option: %s", arg);
4192 /* Zero out the `=' sign so that we get two separate strings. */
4194 /* Figure out what value is specified. */
4195 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4196 if (val != INVALID_PARAM_VAL)
4197 set_param_value (arg, val);
4199 error ("invalid parameter value `%s'", equal + 1);
4214 /* Already been treated in main (). Do nothing. */
4218 set_target_switch (arg + 1);
4222 return decode_f_option (arg + 1);
4225 return decode_g_option (arg + 1);
4228 if (!strcmp (arg, "dumpbase"))
4233 dump_base_name = argv[1];
4237 decode_d_option (arg + 1);
4241 if (!strcmp (arg, "pedantic"))
4243 else if (!strcmp (arg, "pedantic-errors"))
4244 flag_pedantic_errors = pedantic = 1;
4245 else if (arg[1] == 0)
4252 if (!strcmp (arg, "quiet"))
4259 if (!strcmp (arg, "version"))
4267 inhibit_warnings = 1;
4276 /* We save the value of warn_uninitialized, since if they put
4277 -Wuninitialized on the command line, we need to generate a
4278 warning about not using it without also specifying -O. */
4279 if (warn_uninitialized != 1)
4280 warn_uninitialized = 2;
4283 return decode_W_option (arg + 1);
4287 if (!strncmp (arg, "aux-info", 8))
4294 aux_info_file_name = argv[1];
4295 flag_gen_aux_info = 1;
4298 else if (arg[8] == '=')
4300 aux_info_file_name = arg + 9;
4301 flag_gen_aux_info = 1;
4316 asm_file_name = argv[1];
4331 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4336 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4340 if (g_switch_val == -1)
4344 g_switch_set = TRUE;
4345 g_switch_value = g_switch_val;
4355 /* Decode -m switches. */
4356 /* Decode the switch -mNAME. */
4359 set_target_switch (name)
4363 int valid_target_option = 0;
4365 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4366 if (!strcmp (target_switches[j].name, name))
4368 if (target_switches[j].value < 0)
4369 target_flags &= ~-target_switches[j].value;
4371 target_flags |= target_switches[j].value;
4372 valid_target_option = 1;
4375 #ifdef TARGET_OPTIONS
4376 if (!valid_target_option)
4377 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4379 int len = strlen (target_options[j].prefix);
4380 if (!strncmp (target_options[j].prefix, name, len))
4382 *target_options[j].variable = name + len;
4383 valid_target_option = 1;
4388 if (!valid_target_option)
4389 error ("invalid option `%s'", name);
4392 /* Print version information to FILE.
4393 Each line begins with INDENT (for the case where FILE is the
4394 assembler output file). */
4397 print_version (file, indent)
4402 #define __VERSION__ "[?]"
4406 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4408 "%s%s%s version %s (%s) compiled by CC.\n"
4410 , indent, *indent != 0 ? " " : "",
4411 lang_hooks.name, version_string, TARGET_NAME,
4412 indent, __VERSION__);
4415 /* Print an option value and return the adjusted position in the line.
4416 ??? We don't handle error returns from fprintf (disk full); presumably
4417 other code will catch a disk full though. */
4420 print_single_switch (file, pos, max, indent, sep, term, type, name)
4423 const char *indent, *sep, *term, *type, *name;
4425 /* The ultrix fprintf returns 0 on success, so compute the result we want
4426 here since we need it for the following test. */
4427 int len = strlen (sep) + strlen (type) + strlen (name);
4432 fprintf (file, "%s", term);
4437 fprintf (file, "%s", indent);
4438 pos = strlen (indent);
4440 fprintf (file, "%s%s%s", sep, type, name);
4445 /* Print active target switches to FILE.
4446 POS is the current cursor position and MAX is the size of a "line".
4447 Each line begins with INDENT and ends with TERM.
4448 Each switch is separated from the next by SEP. */
4451 print_switch_values (file, pos, max, indent, sep, term)
4454 const char *indent, *sep, *term;
4459 /* Print the options as passed. */
4461 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4462 _("options passed: "), "");
4464 for (p = &save_argv[1]; *p != NULL; p++)
4468 if (strcmp (*p, "-o") == 0)
4474 if (strcmp (*p, "-quiet") == 0)
4476 if (strcmp (*p, "-version") == 0)
4481 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4484 fprintf (file, "%s", term);
4486 /* Print the -f and -m options that have been enabled.
4487 We don't handle language specific options but printing argv
4490 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4491 _("options enabled: "), "");
4493 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4494 if (*f_options[j].variable == f_options[j].on_value)
4495 pos = print_single_switch (file, pos, max, indent, sep, term,
4496 "-f", f_options[j].string);
4498 /* Print target specific options. */
4500 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4501 if (target_switches[j].name[0] != '\0'
4502 && target_switches[j].value > 0
4503 && ((target_switches[j].value & target_flags)
4504 == target_switches[j].value))
4506 pos = print_single_switch (file, pos, max, indent, sep, term,
4507 "-m", target_switches[j].name);
4510 #ifdef TARGET_OPTIONS
4511 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4512 if (*target_options[j].variable != NULL)
4515 sprintf (prefix, "-m%s", target_options[j].prefix);
4516 pos = print_single_switch (file, pos, max, indent, sep, term,
4517 prefix, *target_options[j].variable);
4521 fprintf (file, "%s", term);
4524 /* Open assembly code output file. Do this even if -fsyntax-only is
4525 on, because then the driver will have provided the name of a
4526 temporary file or bit bucket for us. NAME is the file specified on
4527 the command line, possibly NULL. */
4529 init_asm_output (name)
4532 if (name == NULL && asm_file_name == 0)
4533 asm_out_file = stdout;
4536 if (asm_file_name == 0)
4538 int len = strlen (dump_base_name);
4539 char *dumpname = (char *) xmalloc (len + 6);
4540 memcpy (dumpname, dump_base_name, len + 1);
4541 strip_off_ending (dumpname, len);
4542 strcat (dumpname, ".s");
4543 asm_file_name = dumpname;
4545 if (!strcmp (asm_file_name, "-"))
4546 asm_out_file = stdout;
4548 asm_out_file = fopen (asm_file_name, "w");
4549 if (asm_out_file == 0)
4550 fatal_io_error ("can't open %s for writing", asm_file_name);
4553 #ifdef IO_BUFFER_SIZE
4554 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4555 _IOFBF, IO_BUFFER_SIZE);
4558 if (!flag_syntax_only)
4560 #ifdef ASM_FILE_START
4561 ASM_FILE_START (asm_out_file);
4564 #ifdef ASM_COMMENT_START
4565 if (flag_verbose_asm)
4567 /* Print the list of options in effect. */
4568 print_version (asm_out_file, ASM_COMMENT_START);
4569 print_switch_values (asm_out_file, 0, MAX_LINE,
4570 ASM_COMMENT_START, " ", "\n");
4571 /* Add a blank line here so it appears in assembler output but not
4573 fprintf (asm_out_file, "\n");
4579 /* Initialization of the front end environment, before command line
4580 options are parsed. Signal handlers, internationalization etc.
4581 ARGV0 is main's argv[0]. */
4583 general_init (argv0)
4588 p = argv0 + strlen (argv0);
4589 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4593 xmalloc_set_program_name (progname);
4595 gcc_init_libintl ();
4597 /* Install handler for SIGFPE, which may be received while we do
4598 compile-time floating point arithmetic. */
4599 signal (SIGFPE, float_signal);
4601 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4603 signal (SIGSEGV, crash_signal);
4606 signal (SIGILL, crash_signal);
4609 signal (SIGBUS, crash_signal);
4612 signal (SIGABRT, crash_signal);
4614 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4615 signal (SIGIOT, crash_signal);
4618 /* Initialize the diagnostics reporting machinery, so option parsing
4619 can give warnings and errors. */
4620 diagnostic_initialize (global_dc);
4623 /* Parse command line options and set default flag values, called
4624 after language-independent option-independent initialization. Do
4625 minimal options processing. Outputting diagnostics is OK, but GC
4626 and identifier hashtables etc. are not initialized yet. */
4628 parse_options_and_default_flags (argc, argv)
4634 /* Save in case md file wants to emit args as a comment. */
4638 /* Initialize register usage now so switches may override. */
4641 /* Register the language-independent parameters. */
4642 add_params (lang_independent_params, LAST_PARAM);
4644 /* Perform language-specific options initialization. */
4645 (*lang_hooks.init_options) ();
4647 /* Scan to see what optimization level has been specified. That will
4648 determine the default value of many flags. */
4649 for (i = 1; i < argc; i++)
4651 if (!strcmp (argv[i], "-O"))
4656 else if (argv[i][0] == '-' && argv[i][1] == 'O')
4658 /* Handle -Os, -O2, -O3, -O69, ... */
4659 char *p = &argv[i][2];
4661 if ((p[0] == 's') && (p[1] == 0))
4665 /* Optimizing for size forces optimize to be 2. */
4670 const int optimize_val = read_integral_parameter (p, p - 2, -1);
4671 if (optimize_val != -1)
4673 optimize = optimize_val;
4675 #ifdef FORCE_OPTIMIZATION_DOWNGRADE
4676 #warning FORCE_OPTIMIZATION_DOWNGRADE
4677 if (optimize > FORCE_OPTIMIZATION_DOWNGRADE)
4679 optimize = FORCE_OPTIMIZATION_DOWNGRADE;
4680 warning ("\n***\n***\t-O%d converted to \"-O%d\" due to optimizer bugs on this platform\n***",
4682 FORCE_OPTIMIZATION_DOWNGRADE);
4685 #endif /*FORCE_OPTIMIZATION_DOWNGRADE*/
4687 #if defined(__alpha__)
4690 warning ("\n***\n***\tThe -O%d flag TRIGGERS KNOWN OPTIMIZER BUGS ON THIS PLATFORM\n***",
4693 #endif /*__alpha__*/
4703 flag_merge_constants = 0;
4709 flag_thread_jumps = 1;
4711 flag_delayed_branch = 1;
4713 #ifdef CAN_DEBUG_WITHOUT_FP
4714 flag_omit_frame_pointer = 1;
4716 flag_guess_branch_prob = 1;
4717 flag_cprop_registers = 1;
4722 flag_optimize_sibling_calls = 1;
4723 flag_cse_follow_jumps = 1;
4724 flag_cse_skip_blocks = 1;
4726 flag_expensive_optimizations = 1;
4727 flag_strength_reduce = 1;
4728 flag_rerun_cse_after_loop = 1;
4729 flag_rerun_loop_opt = 1;
4730 flag_caller_saves = 1;
4733 #ifdef INSN_SCHEDULING
4734 flag_schedule_insns = 1;
4735 flag_schedule_insns_after_reload = 1;
4738 flag_strict_aliasing = 1;
4739 flag_delete_null_pointer_checks = 1;
4740 flag_reorder_blocks = 1;
4745 flag_inline_functions = 1;
4746 flag_rename_registers = 1;
4754 align_functions = 1;
4757 /* Initialize whether `char' is signed. */
4758 flag_signed_char = DEFAULT_SIGNED_CHAR;
4759 #ifdef DEFAULT_SHORT_ENUMS
4760 /* Initialize how much space enums occupy, by default. */
4761 flag_short_enums = DEFAULT_SHORT_ENUMS;
4764 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
4767 set_target_switch ("");
4769 /* Unwind tables are always present in an ABI-conformant IA-64
4770 object file, so the default should be ON. */
4771 #ifdef IA64_UNWIND_INFO
4772 flag_unwind_tables = IA64_UNWIND_INFO;
4775 #ifdef OPTIMIZATION_OPTIONS
4776 /* Allow default optimizations to be specified on a per-machine basis. */
4777 OPTIMIZATION_OPTIONS (optimize, optimize_size);
4780 /* Perform normal command line switch decoding. */
4781 for (i = 1; i < argc;)
4784 int indep_processed;
4786 /* Give the language a chance to decode the option for itself. */
4787 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
4789 if (lang_processed >= 0)
4790 /* Now see if the option also has a language independent meaning.
4791 Some options are both language specific and language independent,
4793 indep_processed = independent_decode_option (argc - i, argv + i);
4796 lang_processed = -lang_processed;
4797 indep_processed = 0;
4800 if (lang_processed || indep_processed)
4801 i += MAX (lang_processed, indep_processed);
4804 const char *option = NULL;
4805 const char *lang = NULL;
4808 /* It is possible that the command line switch is not valid for the
4809 current language, but it is valid for another language. In order
4810 to be compatible with previous versions of the compiler (which
4811 did not issue an error message in this case) we check for this
4812 possibility here. If we do find a match, then if extra_warnings
4813 is set we generate a warning message, otherwise we will just
4814 ignore the option. */
4815 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
4817 option = documented_lang_options[j].option;
4820 lang = documented_lang_options[j].description;
4821 else if (! strncmp (argv[i], option, strlen (option)))
4825 if (j != ARRAY_SIZE (documented_lang_options))
4829 warning ("ignoring command line option '%s'", argv[i]);
4832 ("(it is valid for %s but not the selected language)",
4836 else if (argv[i][0] == '-' && argv[i][1] == 'g')
4837 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
4839 error ("unrecognized option `%s'", argv[i]);
4845 if (flag_no_inline == 2)
4848 flag_really_no_inline = flag_no_inline;
4850 /* Set flag_no_inline before the post_options () hook. The C front
4851 ends use it to determine tree inlining defaults. FIXME: such
4852 code should be lang-independent when all front ends use tree
4853 inlining, in which case it, and this condition, should be moved
4854 to the top of process_options() instead. */
4857 /* Inlining does not work if not optimizing,
4858 so force it not to be done. */
4862 /* The c_decode_option function and decode_option hook set
4863 this to `2' if -Wall is used, so we can avoid giving out
4864 lots of errors for people who don't realize what -Wall does. */
4865 if (warn_uninitialized == 1)
4866 warning ("-Wuninitialized is not supported without -O");
4869 if (flag_really_no_inline == 2)
4870 flag_really_no_inline = flag_no_inline;
4872 /* All command line options have been parsed; allow the front end to
4873 perform consistency checks, etc. */
4874 (*lang_hooks.post_options) ();
4877 /* Process the options that have been parsed. */
4881 #ifdef OVERRIDE_OPTIONS
4882 /* Some machines may reject certain combinations of options. */
4886 /* Set up the align_*_log variables, defaulting them to 1 if they
4887 were still unset. */
4888 if (align_loops <= 0) align_loops = 1;
4889 if (align_loops_max_skip > align_loops || !align_loops)
4890 align_loops_max_skip = align_loops - 1;
4891 align_loops_log = floor_log2 (align_loops * 2 - 1);
4892 if (align_jumps <= 0) align_jumps = 1;
4893 if (align_jumps_max_skip > align_jumps || !align_jumps)
4894 align_jumps_max_skip = align_jumps - 1;
4895 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
4896 if (align_labels <= 0) align_labels = 1;
4897 align_labels_log = floor_log2 (align_labels * 2 - 1);
4898 if (align_labels_max_skip > align_labels || !align_labels)
4899 align_labels_max_skip = align_labels - 1;
4900 if (align_functions <= 0) align_functions = 1;
4901 align_functions_log = floor_log2 (align_functions * 2 - 1);
4903 /* Unrolling all loops implies that standard loop unrolling must also
4905 if (flag_unroll_all_loops)
4906 flag_unroll_loops = 1;
4907 /* Loop unrolling requires that strength_reduction be on also. Silently
4908 turn on strength reduction here if it isn't already on. Also, the loop
4909 unrolling code assumes that cse will be run after loop, so that must
4910 be turned on also. */
4911 if (flag_unroll_loops)
4913 flag_strength_reduce = 1;
4914 flag_rerun_cse_after_loop = 1;
4917 if (flag_non_call_exceptions)
4918 flag_asynchronous_unwind_tables = 1;
4919 if (flag_asynchronous_unwind_tables)
4920 flag_unwind_tables = 1;
4922 /* Warn about options that are not supported on this machine. */
4923 #ifndef INSN_SCHEDULING
4924 if (flag_schedule_insns || flag_schedule_insns_after_reload)
4925 warning ("instruction scheduling not supported on this target machine");
4928 if (flag_delayed_branch)
4929 warning ("this target machine does not have delayed branches");
4932 /* Some operating systems do not allow profiling without a frame
4934 if (!TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
4936 && flag_omit_frame_pointer)
4938 error ("profiling does not work without a frame pointer");
4939 flag_omit_frame_pointer = 0;
4942 user_label_prefix = USER_LABEL_PREFIX;
4943 if (flag_leading_underscore != -1)
4945 /* If the default prefix is more complicated than "" or "_",
4946 issue a warning and ignore this option. */
4947 if (user_label_prefix[0] == 0 ||
4948 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
4950 user_label_prefix = flag_leading_underscore ? "_" : "";
4953 warning ("-f%sleading-underscore not supported on this target machine",
4954 flag_leading_underscore ? "" : "no-");
4957 /* If we are in verbose mode, write out the version and maybe all the
4958 option flags in use. */
4961 print_version (stderr, "");
4963 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
4969 if (flag_syntax_only)
4971 write_symbols = NO_DEBUG;
4975 /* Now we know write_symbols, set up the debug hooks based on it.
4976 By default we do nothing for debug output. */
4977 #if defined(DBX_DEBUGGING_INFO)
4978 if (write_symbols == DBX_DEBUG)
4979 debug_hooks = &dbx_debug_hooks;
4981 #if defined(XCOFF_DEBUGGING_INFO)
4982 if (write_symbols == XCOFF_DEBUG)
4983 debug_hooks = &xcoff_debug_hooks;
4985 #ifdef SDB_DEBUGGING_INFO
4986 if (write_symbols == SDB_DEBUG)
4987 debug_hooks = &sdb_debug_hooks;
4989 #ifdef DWARF_DEBUGGING_INFO
4990 if (write_symbols == DWARF_DEBUG)
4991 debug_hooks = &dwarf_debug_hooks;
4993 #ifdef DWARF2_DEBUGGING_INFO
4994 if (write_symbols == DWARF2_DEBUG)
4995 debug_hooks = &dwarf2_debug_hooks;
4997 #ifdef VMS_DEBUGGING_INFO
4998 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4999 debug_hooks = &vmsdbg_debug_hooks;
5002 /* If auxiliary info generation is desired, open the output file.
5003 This goes in the same directory as the source file--unlike
5004 all the other output files. */
5005 if (flag_gen_aux_info)
5007 aux_info_file = fopen (aux_info_file_name, "w");
5008 if (aux_info_file == 0)
5009 fatal_io_error ("can't open %s", aux_info_file_name);
5012 if (! targetm.have_named_sections)
5014 if (flag_function_sections)
5016 warning ("-ffunction-sections not supported for this target");
5017 flag_function_sections = 0;
5019 if (flag_data_sections)
5021 warning ("-fdata-sections not supported for this target");
5022 flag_data_sections = 0;
5026 if (flag_function_sections && profile_flag)
5028 warning ("-ffunction-sections disabled; it makes profiling impossible");
5029 flag_function_sections = 0;
5032 #ifndef HAVE_prefetch
5033 if (flag_prefetch_loop_arrays)
5035 warning ("-fprefetch-loop-arrays not supported for this target");
5036 flag_prefetch_loop_arrays = 0;
5039 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
5041 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
5042 flag_prefetch_loop_arrays = 0;
5046 /* This combination of options isn't handled for i386 targets and doesn't
5047 make much sense anyway, so don't allow it. */
5048 if (flag_prefetch_loop_arrays && optimize_size)
5050 warning ("-fprefetch-loop-arrays is not supported with -Os");
5051 flag_prefetch_loop_arrays = 0;
5054 #ifndef OBJECT_FORMAT_ELF
5055 if (flag_function_sections && write_symbols != NO_DEBUG)
5056 warning ("-ffunction-sections may affect debugging on some targets");
5060 /* Language-independent initialization, before language-dependent
5063 lang_independent_init ()
5065 decl_printable_name = decl_name;
5066 lang_expand_expr = (lang_expand_expr_t) do_abort;
5068 /* Set the language-dependent identifier size. */
5069 tree_code_length[(int) IDENTIFIER_NODE]
5070 = ((lang_hooks.identifier_size - sizeof (struct tree_common)
5071 + sizeof (tree) - 1) / sizeof (tree));
5073 /* Initialize the garbage-collector, and string pools. */
5075 ggc_add_rtx_root (&stack_limit_rtx, 1);
5076 ggc_add_tree_root (¤t_function_decl, 1);
5077 ggc_add_tree_root (¤t_function_func_begin_label, 1);
5082 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
5083 || debug_info_level == DINFO_LEVEL_VERBOSE
5084 #ifdef VMS_DEBUGGING_INFO
5085 /* Enable line number info for traceback */
5086 || debug_info_level > DINFO_LEVEL_NONE
5088 || flag_test_coverage
5089 || warn_notreached);
5095 init_function_once ();
5096 init_stor_layout_once ();
5097 init_varasm_once ();
5098 init_EXPR_INSN_LIST_cache ();
5100 /* The following initialization functions need to generate rtl, so
5101 provide a dummy function context for them. */
5102 init_dummy_function_start ();
5105 if (flag_caller_saves)
5106 init_caller_save ();
5107 expand_dummy_function_end ();
5110 /* Language-dependent initialization. Returns non-zero on success. */
5112 lang_dependent_init (name)
5115 if (dump_base_name == 0)
5116 dump_base_name = name ? name : "gccdump";
5118 /* Front-end initialization. This hook can assume that GC,
5119 identifier hashes etc. are set up, but debug initialization is
5120 not done yet. This routine must return the original filename
5121 (e.g. foo.i -> foo.c) so can correctly initialize debug output. */
5122 name = (*lang_hooks.init) (name);
5126 /* Is this duplication necessary? */
5127 name = ggc_strdup (name);
5128 main_input_filename = input_filename = name;
5129 init_asm_output (name);
5131 /* These create various _DECL nodes, so need to be called after the
5132 front end is initialized. */
5136 /* Put an entry on the input file stack for the main input file. */
5137 push_srcloc (input_filename, 0);
5139 /* If dbx symbol table desired, initialize writing it and output the
5140 predefined types. */
5141 timevar_push (TV_SYMOUT);
5143 #ifdef DWARF2_UNWIND_INFO
5144 if (dwarf2out_do_frame ())
5145 dwarf2out_frame_init ();
5148 /* Now we have the correct original filename, we can initialize
5150 (*debug_hooks->init) (name);
5152 timevar_pop (TV_SYMOUT);
5157 /* Clean up: close opened files, etc. */
5162 /* Close the dump files. */
5163 if (flag_gen_aux_info)
5165 fclose (aux_info_file);
5167 unlink (aux_info_file_name);
5170 /* Close non-debugging input and output files. Take special care to note
5171 whether fclose returns an error, since the pages might still be on the
5172 buffer chain while the file is open. */
5176 if (ferror (asm_out_file) != 0)
5177 fatal_io_error ("error writing to %s", asm_file_name);
5178 if (fclose (asm_out_file) != 0)
5179 fatal_io_error ("error closing %s", asm_file_name);
5182 /* Do whatever is necessary to finish printing the graphs. */
5183 if (graph_dump_format != no_graph)
5187 for (i = 0; i < (int) DFI_MAX; ++i)
5188 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5193 sprintf (seq, DUMPFILE_FORMAT, i);
5194 suffix = concat (seq, dump_file[i].extension, NULL);
5195 finish_graph_dump_file (dump_base_name, suffix);
5202 ggc_print_statistics ();
5203 stringpool_statistics ();
5204 dump_tree_statistics ();
5207 /* Free up memory for the benefit of leak detectors. */
5210 /* Language-specific end of compilation actions. */
5211 (*lang_hooks.finish) ();
5214 /* Initialize the compiler, and compile the input file. */
5218 /* The bulk of command line switch processing. */
5221 /* We cannot start timing until after options are processed since that
5222 says if we run timers or not. */
5224 timevar_start (TV_TOTAL);
5226 /* Language-independent initialization. Also sets up GC, identifier
5228 lang_independent_init ();
5230 /* Language-dependent initialization. Returns true on success. */
5231 if (lang_dependent_init (filename))
5236 /* Stop timing and print the times. */
5237 timevar_stop (TV_TOTAL);
5238 timevar_print (stderr);
5241 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5242 Decode command args, then call compile_file.
5243 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5244 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5246 It is not safe to call this function more than once. */
5249 toplev_main (argc, argv)
5255 /* Initialization of GCC's environment, and diagnostics. */
5256 general_init (argv [0]);
5258 /* Parse the options and do minimal processing; basically just
5259 enough to default flags appropriately. */
5260 parse_options_and_default_flags (argc, argv);
5262 /* Exit early if we can (e.g. -help). */
5263 if (!exit_after_options)
5266 if (errorcount || sorrycount)
5267 return (FATAL_EXIT_CODE);
5269 return (SUCCESS_EXIT_CODE);