PR C++/689
[official-gcc.git] / gcc / toplev.c
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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, 2003 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
10 version.
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
15 for more details.
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
20 02111-1307, USA. */
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
27 #include "config.h"
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
30 #include "system.h"
31 #include "coretypes.h"
32 #include "tm.h"
33 #include <signal.h>
35 #ifdef HAVE_SYS_RESOURCE_H
36 # include <sys/resource.h>
37 #endif
39 #ifdef HAVE_SYS_TIMES_H
40 # include <sys/times.h>
41 #endif
43 #include "input.h"
44 #include "tree.h"
45 #include "rtl.h"
46 #include "tm_p.h"
47 #include "flags.h"
48 #include "insn-attr.h"
49 #include "insn-config.h"
50 #include "insn-flags.h"
51 #include "hard-reg-set.h"
52 #include "recog.h"
53 #include "output.h"
54 #include "except.h"
55 #include "function.h"
56 #include "toplev.h"
57 #include "expr.h"
58 #include "basic-block.h"
59 #include "intl.h"
60 #include "ggc.h"
61 #include "graph.h"
62 #include "loop.h"
63 #include "regs.h"
64 #include "timevar.h"
65 #include "diagnostic.h"
66 #include "ssa.h"
67 #include "params.h"
68 #include "reload.h"
69 #include "dwarf2asm.h"
70 #include "integrate.h"
71 #include "real.h"
72 #include "debug.h"
73 #include "target.h"
74 #include "langhooks.h"
75 #include "cfglayout.h"
76 #include "cfgloop.h"
77 #include "hosthooks.h"
78 #include "cgraph.h"
80 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
81 #include "dwarf2out.h"
82 #endif
84 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
85 #include "dbxout.h"
86 #endif
88 #ifdef SDB_DEBUGGING_INFO
89 #include "sdbout.h"
90 #endif
92 #ifdef XCOFF_DEBUGGING_INFO
93 #include "xcoffout.h" /* Needed for external data
94 declarations for e.g. AIX 4.x. */
95 #endif
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 extern void reg_alloc PARAMS ((void));
105 static void general_init PARAMS ((char *));
106 static void parse_options_and_default_flags PARAMS ((int, char **));
107 static void do_compile PARAMS ((void));
108 static void process_options PARAMS ((void));
109 static void backend_init PARAMS ((void));
110 static int lang_dependent_init PARAMS ((const char *));
111 static void init_asm_output PARAMS ((const char *));
112 static void finalize PARAMS ((void));
114 static void set_target_switch PARAMS ((const char *));
116 static void crash_signal PARAMS ((int)) ATTRIBUTE_NORETURN;
117 static void setup_core_dumping PARAMS ((void));
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 **));
127 static void set_Wextra PARAMS ((int));
129 static void print_version PARAMS ((FILE *, const char *));
130 static int print_single_switch PARAMS ((FILE *, int, int, const char *,
131 const char *, const char *,
132 const char *, const char *));
133 static void print_switch_values PARAMS ((FILE *, int, int, const char *,
134 const char *, const char *));
136 /* Nonzero to dump debug info whilst parsing (-dy option). */
137 static int set_yydebug;
139 /* True if we don't need a backend (e.g. preprocessing only). */
140 static bool no_backend;
142 /* Length of line when printing switch values. */
143 #define MAX_LINE 75
145 /* Name of program invoked, sans directories. */
147 const char *progname;
149 /* Copy of arguments to toplev_main. */
150 int save_argc;
151 char **save_argv;
153 /* Name of top-level original source file (what was input to cpp).
154 This comes from the #-command at the beginning of the actual input.
155 If there isn't any there, then this is the cc1 input file name. */
157 const char *main_input_filename;
159 /* Current position in real source file. */
161 location_t input_location;
163 /* Nonzero if it is unsafe to create any new pseudo registers. */
164 int no_new_pseudos;
166 /* Stack of currently pending input files. */
168 struct file_stack *input_file_stack;
170 /* Incremented on each change to input_file_stack. */
171 int input_file_stack_tick;
173 /* Name to use as base of names for dump output files. */
175 const char *dump_base_name;
177 /* Name to use as a base for auxiliary output files. */
179 static const char *aux_base_name;
181 /* Format to use to print dumpfile index value */
182 #ifndef DUMPFILE_FORMAT
183 #define DUMPFILE_FORMAT ".%02d."
184 #endif
186 /* Bit flags that specify the machine subtype we are compiling for.
187 Bits are tested using macros TARGET_... defined in the tm.h file
188 and set by `-m...' switches. Must be defined in rtlanal.c. */
190 extern int target_flags;
192 /* A mask of target_flags that includes bit X if X was set or cleared
193 on the command line. */
195 int target_flags_explicit;
197 /* Debug hooks - dependent upon command line options. */
199 const struct gcc_debug_hooks *debug_hooks = &do_nothing_debug_hooks;
201 /* Describes a dump file. */
203 struct dump_file_info
205 /* The unique extension to apply, e.g. ".jump". */
206 const char *const extension;
208 /* The -d<c> character that enables this dump file. */
209 char const debug_switch;
211 /* True if there is a corresponding graph dump file. */
212 char const graph_dump_p;
214 /* True if the user selected this dump. */
215 char enabled;
217 /* True if the files have been initialized (ie truncated). */
218 char initialized;
221 /* Enumerate the extant dump files. */
223 enum dump_file_index
225 DFI_rtl,
226 DFI_sibling,
227 DFI_eh,
228 DFI_jump,
229 DFI_ssa,
230 DFI_ssa_ccp,
231 DFI_ssa_dce,
232 DFI_ussa,
233 DFI_null,
234 DFI_cse,
235 DFI_addressof,
236 DFI_gcse,
237 DFI_loop,
238 DFI_bypass,
239 DFI_cfg,
240 DFI_bp,
241 DFI_ce1,
242 DFI_tracer,
243 DFI_loop2,
244 DFI_cse2,
245 DFI_life,
246 DFI_combine,
247 DFI_ce2,
248 DFI_regmove,
249 DFI_sched,
250 DFI_lreg,
251 DFI_greg,
252 DFI_postreload,
253 DFI_flow2,
254 DFI_peephole2,
255 DFI_rnreg,
256 DFI_bbro,
257 DFI_ce3,
258 DFI_sched2,
259 DFI_stack,
260 DFI_mach,
261 DFI_dbr,
262 DFI_MAX
265 /* Describes all the dump files. Should be kept in order of the
266 pass and in sync with dump_file_index above.
268 Remaining -d letters:
270 " o q "
271 " H JK OPQ TUV YZ"
274 static struct dump_file_info dump_file[DFI_MAX] =
276 { "rtl", 'r', 0, 0, 0 },
277 { "sibling", 'i', 0, 0, 0 },
278 { "eh", 'h', 0, 0, 0 },
279 { "jump", 'j', 0, 0, 0 },
280 { "ssa", 'e', 1, 0, 0 },
281 { "ssaccp", 'W', 1, 0, 0 },
282 { "ssadce", 'X', 1, 0, 0 },
283 { "ussa", 'e', 1, 0, 0 }, /* Yes, duplicate enable switch. */
284 { "null", 'u', 0, 0, 0 },
285 { "cse", 's', 0, 0, 0 },
286 { "addressof", 'F', 0, 0, 0 },
287 { "gcse", 'G', 1, 0, 0 },
288 { "loop", 'L', 1, 0, 0 },
289 { "bypass", 'G', 1, 0, 0 }, /* Yes, duplicate enable switch. */
290 { "cfg", 'f', 1, 0, 0 },
291 { "bp", 'b', 1, 0, 0 },
292 { "ce1", 'C', 1, 0, 0 },
293 { "tracer", 'T', 1, 0, 0 },
294 { "loop2", 'L', 1, 0, 0 },
295 { "cse2", 't', 1, 0, 0 },
296 { "life", 'f', 1, 0, 0 }, /* Yes, duplicate enable switch. */
297 { "combine", 'c', 1, 0, 0 },
298 { "ce2", 'C', 1, 0, 0 },
299 { "regmove", 'N', 1, 0, 0 },
300 { "sched", 'S', 1, 0, 0 },
301 { "lreg", 'l', 1, 0, 0 },
302 { "greg", 'g', 1, 0, 0 },
303 { "postreload", 'o', 1, 0, 0 },
304 { "flow2", 'w', 1, 0, 0 },
305 { "peephole2", 'z', 1, 0, 0 },
306 { "rnreg", 'n', 1, 0, 0 },
307 { "bbro", 'B', 1, 0, 0 },
308 { "ce3", 'E', 1, 0, 0 },
309 { "sched2", 'R', 1, 0, 0 },
310 { "stack", 'k', 1, 0, 0 },
311 { "mach", 'M', 1, 0, 0 },
312 { "dbr", 'd', 0, 0, 0 },
315 static int open_dump_file PARAMS ((enum dump_file_index, tree));
316 static void close_dump_file PARAMS ((enum dump_file_index,
317 void (*) (FILE *, rtx), rtx));
319 /* Other flags saying which kinds of debugging dump have been requested. */
321 int rtl_dump_and_exit;
322 int flag_print_asm_name;
323 static int version_flag;
324 static const char *filename;
325 enum graph_dump_types graph_dump_format;
327 /* Name for output file of assembly code, specified with -o. */
329 char *asm_file_name;
331 /* Value of the -G xx switch, and whether it was passed or not. */
332 int g_switch_value;
333 int g_switch_set;
335 /* Type(s) of debugging information we are producing (if any).
336 See flags.h for the definitions of the different possible
337 types of debugging information. */
338 enum debug_info_type write_symbols = NO_DEBUG;
340 /* Level of debugging information we are producing. See flags.h
341 for the definitions of the different possible levels. */
342 enum debug_info_level debug_info_level = DINFO_LEVEL_NONE;
344 /* Nonzero means use GNU-only extensions in the generated symbolic
345 debugging information. */
346 /* Currently, this only has an effect when write_symbols is set to
347 DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */
348 int use_gnu_debug_info_extensions = 0;
350 /* Nonzero means do optimizations. -O.
351 Particular numeric values stand for particular amounts of optimization;
352 thus, -O2 stores 2 here. However, the optimizations beyond the basic
353 ones are not controlled directly by this variable. Instead, they are
354 controlled by individual `flag_...' variables that are defaulted
355 based on this variable. */
357 int optimize = 0;
359 /* Nonzero means optimize for size. -Os.
360 The only valid values are zero and nonzero. When optimize_size is
361 nonzero, optimize defaults to 2, but certain individual code
362 bloating optimizations are disabled. */
364 int optimize_size = 0;
366 /* Nonzero if we should exit after parsing options. */
367 static int exit_after_options = 0;
369 /* The FUNCTION_DECL for the function currently being compiled,
370 or 0 if between functions. */
371 tree current_function_decl;
373 /* Set to the FUNC_BEGIN label of the current function, or NULL_TREE
374 if none. */
375 tree current_function_func_begin_label;
377 /* Nonzero if doing dwarf2 duplicate elimination. */
379 int flag_eliminate_dwarf2_dups = 0;
381 /* Nonzero if doing unused type elimination. */
383 int flag_eliminate_unused_debug_types = 1;
385 /* Nonzero if generating code to do profiling. */
387 int profile_flag = 0;
389 /* Nonzero if generating code to profile program flow graph arcs. */
391 int profile_arc_flag = 0;
393 /* Nonzero if generating info for gcov to calculate line test coverage. */
395 int flag_test_coverage = 0;
397 /* Nonzero indicates that branch taken probabilities should be calculated. */
399 int flag_branch_probabilities = 0;
401 /* Nonzero if basic blocks should be reordered. */
403 int flag_reorder_blocks = 0;
405 /* Nonzero if functions should be reordered. */
407 int flag_reorder_functions = 0;
409 /* Nonzero if registers should be renamed. */
411 int flag_rename_registers = 0;
412 int flag_cprop_registers = 0;
414 /* Nonzero for -pedantic switch: warn about anything
415 that standard spec forbids. */
417 int pedantic = 0;
419 /* Temporarily suppress certain warnings.
420 This is set while reading code from a system header file. */
422 int in_system_header = 0;
424 /* Don't print functions as they are compiled. -quiet. */
426 int quiet_flag = 0;
428 /* Print times taken by the various passes. -ftime-report. */
430 static int time_report = 0;
432 /* Print memory still in use at end of compilation (which may have little
433 to do with peak memory consumption). -fmem-report. */
435 int mem_report = 0;
437 /* Nonzero means to collect statistics which might be expensive
438 and to print them when we are done. */
439 int flag_detailed_statistics = 0;
442 /* -f flags. */
444 /* Nonzero means `char' should be signed. */
446 int flag_signed_char;
448 /* Nonzero means give an enum type only as many bytes as it needs. */
450 int flag_short_enums;
452 /* Nonzero for -fcaller-saves: allocate values in regs that need to
453 be saved across function calls, if that produces overall better code.
454 Optional now, so people can test it. */
456 #ifdef DEFAULT_CALLER_SAVES
457 int flag_caller_saves = 1;
458 #else
459 int flag_caller_saves = 0;
460 #endif
462 /* Nonzero if structures and unions should be returned in memory.
464 This should only be defined if compatibility with another compiler or
465 with an ABI is needed, because it results in slower code. */
467 #ifndef DEFAULT_PCC_STRUCT_RETURN
468 #define DEFAULT_PCC_STRUCT_RETURN 1
469 #endif
471 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
473 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
475 /* Nonzero for -fforce-mem: load memory value into a register
476 before arithmetic on it. This makes better cse but slower compilation. */
478 int flag_force_mem = 0;
480 /* Nonzero for -fforce-addr: load memory address into a register before
481 reference to memory. This makes better cse but slower compilation. */
483 int flag_force_addr = 0;
485 /* Nonzero for -fdefer-pop: don't pop args after each function call;
486 instead save them up to pop many calls' args with one insns. */
488 int flag_defer_pop = 0;
490 /* Nonzero for -ffloat-store: don't allocate floats and doubles
491 in extended-precision registers. */
493 int flag_float_store = 0;
495 /* Nonzero for -fcse-follow-jumps:
496 have cse follow jumps to do a more extensive job. */
498 int flag_cse_follow_jumps;
500 /* Nonzero for -fcse-skip-blocks:
501 have cse follow a branch around a block. */
502 int flag_cse_skip_blocks;
504 /* Nonzero for -fexpensive-optimizations:
505 perform miscellaneous relatively-expensive optimizations. */
506 int flag_expensive_optimizations;
508 /* Nonzero for -fthread-jumps:
509 have jump optimize output of loop. */
511 int flag_thread_jumps;
513 /* Nonzero enables strength-reduction in loop.c. */
515 int flag_strength_reduce = 0;
517 /* Nonzero enables loop unrolling in unroll.c. Only loops for which the
518 number of iterations can be calculated at compile-time (UNROLL_COMPLETELY,
519 UNROLL_MODULO) or at run-time (preconditioned to be UNROLL_MODULO) are
520 unrolled. */
522 int flag_old_unroll_loops;
524 /* Nonzero enables loop unrolling in unroll.c. All loops are unrolled.
525 This is generally not a win. */
527 int flag_old_unroll_all_loops;
529 /* Enables unrolling of simple loops in loop-unroll.c. */
530 int flag_unroll_loops;
532 /* Enables unrolling of all loops in loop-unroll.c. */
533 int flag_unroll_all_loops;
535 /* Nonzero enables loop peeling. */
536 int flag_peel_loops;
538 /* Nonzero enables loop unswitching. */
539 int flag_unswitch_loops;
541 /* Nonzero enables prefetch optimizations for arrays in loops. */
543 int flag_prefetch_loop_arrays;
545 /* Nonzero forces all invariant computations in loops to be moved
546 outside the loop. */
548 int flag_move_all_movables = 0;
550 /* Nonzero forces all general induction variables in loops to be
551 strength reduced. */
553 int flag_reduce_all_givs = 0;
555 /* Nonzero to perform full register move optimization passes. This is the
556 default for -O2. */
558 int flag_regmove = 0;
560 /* Nonzero for -fwritable-strings:
561 store string constants in data segment and don't uniquize them. */
563 int flag_writable_strings = 0;
565 /* Nonzero means don't put addresses of constant functions in registers.
566 Used for compiling the Unix kernel, where strange substitutions are
567 done on the assembly output. */
569 int flag_no_function_cse = 0;
571 /* Nonzero for -fomit-frame-pointer:
572 don't make a frame pointer in simple functions that don't require one. */
574 int flag_omit_frame_pointer = 0;
576 /* Nonzero means place each function into its own section on those platforms
577 which support arbitrary section names and unlimited numbers of sections. */
579 int flag_function_sections = 0;
581 /* ... and similar for data. */
583 int flag_data_sections = 0;
585 /* Nonzero to inhibit use of define_optimization peephole opts. */
587 int flag_no_peephole = 0;
589 /* Nonzero allows GCC to optimize sibling and tail recursive calls. */
591 int flag_optimize_sibling_calls = 0;
593 /* Nonzero means the front end generally wants `errno' maintained by math
594 operations, like built-in SQRT. */
596 int flag_errno_math = 1;
598 /* Nonzero means that unsafe floating-point math optimizations are allowed
599 for the sake of speed. IEEE compliance is not guaranteed, and operations
600 are allowed to assume that their arguments and results are "normal"
601 (e.g., nonnegative for SQRT). */
603 int flag_unsafe_math_optimizations = 0;
605 /* Nonzero means that no NaNs or +-Infs are expected. */
607 int flag_finite_math_only = 0;
609 /* Zero means that floating-point math operations cannot generate a
610 (user-visible) trap. This is the case, for example, in nonstop
611 IEEE 754 arithmetic. Trapping conditions include division by zero,
612 overflow, underflow, invalid and inexact, but does not include
613 operations on signaling NaNs (see below). */
615 int flag_trapping_math = 1;
617 /* Nonzero means disable transformations observable by signaling NaNs.
618 This option implies that any operation on a IEEE signaling NaN can
619 generate a (user-visible) trap. */
621 int flag_signaling_nans = 0;
623 /* 0 means straightforward implementation of complex divide acceptable.
624 1 means wide ranges of inputs must work for complex divide.
625 2 means C99-like requirements for complex divide (not yet implemented). */
627 int flag_complex_divide_method = 0;
629 /* Nonzero means just do syntax checking; don't output anything. */
631 int flag_syntax_only = 0;
633 /* Nonzero means perform loop optimizer. */
635 static int flag_loop_optimize;
637 /* Nonzero means perform crossjumping. */
639 static int flag_crossjumping;
641 /* Nonzero means perform if conversion. */
643 static int flag_if_conversion;
645 /* Nonzero means perform if conversion after reload. */
647 static int flag_if_conversion2;
649 /* Nonzero means to use global dataflow analysis to eliminate
650 useless null pointer tests. */
652 static int flag_delete_null_pointer_checks;
654 /* Nonzero means perform global CSE. */
656 int flag_gcse = 0;
658 /* Nonzero means to do the enhanced load motion during gcse, which trys
659 to hoist loads by not killing them when a store to the same location
660 is seen. */
662 int flag_gcse_lm = 1;
664 /* Nonzero means to perform store motion after gcse, which will try to
665 move stores closer to the exit block. Its not very effective without
666 flag_gcse_lm. */
668 int flag_gcse_sm = 1;
670 /* Nonzero means to rerun cse after loop optimization. This increases
671 compilation time about 20% and picks up a few more common expressions. */
673 static int flag_rerun_cse_after_loop;
675 /* Nonzero means to run loop optimizations twice. */
677 int flag_rerun_loop_opt;
679 /* Nonzero for -finline-functions: ok to inline functions that look like
680 good inline candidates. */
682 int flag_inline_functions;
684 /* Nonzero for -fkeep-inline-functions: even if we make a function
685 go inline everywhere, keep its definition around for debugging
686 purposes. */
688 int flag_keep_inline_functions;
690 /* Nonzero means that functions will not be inlined. */
692 int flag_no_inline = 2;
694 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
695 not just because the tree inliner turned us off. */
697 int flag_really_no_inline = 2;
699 /* Nonzero means that we should emit static const variables
700 regardless of whether or not optimization is turned on. */
702 int flag_keep_static_consts = 1;
704 /* Nonzero means we should be saving declaration info into a .X file. */
706 int flag_gen_aux_info = 0;
708 /* Specified name of aux-info file. */
710 static char *aux_info_file_name;
712 /* Nonzero means make the text shared if supported. */
714 int flag_shared_data;
716 /* Nonzero means schedule into delayed branch slots if supported. */
718 int flag_delayed_branch;
720 /* Nonzero if we are compiling pure (sharable) code.
721 Value is 1 if we are doing "small" pic; value is 2 if we're doing
722 "large" pic. */
724 int flag_pic;
726 /* Set to the default thread-local storage (tls) model to use. */
728 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
730 /* Nonzero means generate extra code for exception handling and enable
731 exception handling. */
733 int flag_exceptions;
735 /* Nonzero means generate frame unwind info table when supported. */
737 int flag_unwind_tables = 0;
739 /* Nonzero means generate frame unwind info table exact at each insn boundary */
741 int flag_asynchronous_unwind_tables = 0;
743 /* Nonzero means don't place uninitialized global data in common storage
744 by default. */
746 int flag_no_common;
748 /* Nonzero means change certain warnings into errors.
749 Usually these are warnings about failure to conform to some standard. */
751 int flag_pedantic_errors = 0;
753 /* flag_schedule_insns means schedule insns within basic blocks (before
754 local_alloc).
755 flag_schedule_insns_after_reload means schedule insns after
756 global_alloc. */
758 int flag_schedule_insns = 0;
759 int flag_schedule_insns_after_reload = 0;
761 /* When flag_schedule_insns_after_reload is set, use EBB scheduler. */
762 int flag_sched2_use_superblocks = 0;
764 /* When flag_schedule_insns_after_reload is set, construct traces and EBB
765 scheduler. */
766 int flag_sched2_use_traces = 0;
768 /* The following flags have effect only for scheduling before register
769 allocation:
771 flag_schedule_interblock means schedule insns across basic blocks.
772 flag_schedule_speculative means allow speculative motion of non-load insns.
773 flag_schedule_speculative_load means allow speculative motion of some
774 load insns.
775 flag_schedule_speculative_load_dangerous allows speculative motion of more
776 load insns. */
778 int flag_schedule_interblock = 1;
779 int flag_schedule_speculative = 1;
780 int flag_schedule_speculative_load = 0;
781 int flag_schedule_speculative_load_dangerous = 0;
783 int flag_single_precision_constant;
785 /* flag_branch_on_count_reg means try to replace add-1,compare,branch tupple
786 by a cheaper branch on a count register. */
787 int flag_branch_on_count_reg = 1;
789 /* -finhibit-size-directive inhibits output of .size for ELF.
790 This is used only for compiling crtstuff.c,
791 and it may be extended to other effects
792 needed for crtstuff.c on other systems. */
793 int flag_inhibit_size_directive = 0;
795 /* -fverbose-asm causes extra commentary information to be produced in
796 the generated assembly code (to make it more readable). This option
797 is generally only of use to those who actually need to read the
798 generated assembly code (perhaps while debugging the compiler itself).
799 -fno-verbose-asm, the default, causes the extra information
800 to be omitted and is useful when comparing two assembler files. */
802 int flag_verbose_asm = 0;
804 /* -dA causes debug commentary information to be produced in
805 the generated assembly code (to make it more readable). This option
806 is generally only of use to those who actually need to read the
807 generated assembly code (perhaps while debugging the compiler itself).
808 Currently, this switch is only used by dwarfout.c; however, it is intended
809 to be a catchall for printing debug information in the assembler file. */
811 int flag_debug_asm = 0;
813 /* -dP causes the rtl to be emitted as a comment in assembly. */
815 int flag_dump_rtl_in_asm = 0;
817 /* -fgnu-linker specifies use of the GNU linker for initializations.
818 (Or, more generally, a linker that handles initializations.)
819 -fno-gnu-linker says that collect2 will be used. */
820 #ifdef USE_COLLECT2
821 int flag_gnu_linker = 0;
822 #else
823 int flag_gnu_linker = 1;
824 #endif
826 /* Nonzero means put zero initialized data in the bss section. */
827 int flag_zero_initialized_in_bss = 1;
829 /* Enable SSA. */
830 int flag_ssa = 0;
832 /* Enable ssa conditional constant propagation. */
833 int flag_ssa_ccp = 0;
835 /* Enable ssa aggressive dead code elimination. */
836 int flag_ssa_dce = 0;
838 /* Tag all structures with __attribute__(packed). */
839 int flag_pack_struct = 0;
841 /* Emit code to check for stack overflow; also may cause large objects
842 to be allocated dynamically. */
843 int flag_stack_check;
845 /* When non-NULL, indicates that whenever space is allocated on the
846 stack, the resulting stack pointer must not pass this
847 address---that is, for stacks that grow downward, the stack pointer
848 must always be greater than or equal to this address; for stacks
849 that grow upward, the stack pointer must be less than this address.
850 At present, the rtx may be either a REG or a SYMBOL_REF, although
851 the support provided depends on the backend. */
852 rtx stack_limit_rtx;
854 /* 0 if pointer arguments may alias each other. True in C.
855 1 if pointer arguments may not alias each other but may alias
856 global variables.
857 2 if pointer arguments may not alias each other and may not
858 alias global variables. True in Fortran.
859 This defaults to 0 for C. */
860 int flag_argument_noalias = 0;
862 /* Nonzero if we should do (language-dependent) alias analysis.
863 Typically, this analysis will assume that expressions of certain
864 types do not alias expressions of certain other types. Only used
865 if alias analysis (in general) is enabled. */
866 int flag_strict_aliasing = 0;
868 /* Instrument functions with calls at entry and exit, for profiling. */
869 int flag_instrument_function_entry_exit = 0;
871 /* Nonzero means ignore `#ident' directives. 0 means handle them.
872 On SVR4 targets, it also controls whether or not to emit a
873 string identifying the compiler. */
875 int flag_no_ident = 0;
877 /* This will perform a peephole pass before sched2. */
878 int flag_peephole2 = 0;
880 /* This will try to guess branch probabilities. */
881 int flag_guess_branch_prob = 0;
883 /* -fcheck-bounds causes gcc to generate array bounds checks.
884 For C, C++, ObjC: defaults to off.
885 For Java: defaults to on.
886 For Fortran: defaults to off. */
887 int flag_bounds_check = 0;
889 /* This will attempt to merge constant section constants, if 1 only
890 string constants and constants from constant pool, if 2 also constant
891 variables. */
892 int flag_merge_constants = 1;
894 /* If one, renumber instruction UIDs to reduce the number of
895 unused UIDs if there are a lot of instructions. If greater than
896 one, unconditionally renumber instruction UIDs. */
897 int flag_renumber_insns = 1;
899 /* If nonzero, use the graph coloring register allocator. */
900 int flag_new_regalloc = 0;
902 /* Nonzero if we perform superblock formation. */
904 int flag_tracer = 0;
906 /* Nonzero if we perform whole unit at a time compilation. */
908 int flag_unit_at_a_time = 0;
910 /* Values of the -falign-* flags: how much to align labels in code.
911 0 means `use default', 1 means `don't align'.
912 For each variable, there is an _log variant which is the power
913 of two not less than the variable, for .align output. */
915 int align_loops;
916 int align_loops_log;
917 int align_loops_max_skip;
918 int align_jumps;
919 int align_jumps_log;
920 int align_jumps_max_skip;
921 int align_labels;
922 int align_labels_log;
923 int align_labels_max_skip;
924 int align_functions;
925 int align_functions_log;
927 /* Like align_functions_log above, but used by front-ends to force the
928 minimum function alignment. Zero means no alignment is forced. */
929 int force_align_functions_log;
931 /* Table of supported debugging formats. */
932 static const struct
934 const char *const arg;
935 /* Since PREFERRED_DEBUGGING_TYPE isn't necessarily a
936 constant expression, we use NO_DEBUG in its place. */
937 const enum debug_info_type debug_type;
938 const int use_extensions_p;
939 const char *const description;
940 } *da,
941 debug_args[] =
943 { "", NO_DEBUG, DEFAULT_GDB_EXTENSIONS,
944 N_("Generate debugging info in default format") },
945 { "gdb", NO_DEBUG, 1, N_("Generate debugging info in default extended format") },
946 #ifdef DBX_DEBUGGING_INFO
947 { "stabs", DBX_DEBUG, 0, N_("Generate STABS format debug info") },
948 { "stabs+", DBX_DEBUG, 1, N_("Generate extended STABS format debug info") },
949 #endif
950 #ifdef DWARF_DEBUGGING_INFO
951 { "dwarf", DWARF_DEBUG, 0, N_("Generate DWARF-1 format debug info") },
952 { "dwarf+", DWARF_DEBUG, 1,
953 N_("Generate extended DWARF-1 format debug info") },
954 #endif
955 #ifdef DWARF2_DEBUGGING_INFO
956 { "dwarf-2", DWARF2_DEBUG, 0, N_("Generate DWARF-2 debug info") },
957 #endif
958 #ifdef XCOFF_DEBUGGING_INFO
959 { "xcoff", XCOFF_DEBUG, 0, N_("Generate XCOFF format debug info") },
960 { "xcoff+", XCOFF_DEBUG, 1, N_("Generate extended XCOFF format debug info") },
961 #endif
962 #ifdef SDB_DEBUGGING_INFO
963 { "coff", SDB_DEBUG, 0, N_("Generate COFF format debug info") },
964 #endif
965 #ifdef VMS_DEBUGGING_INFO
966 { "vms", VMS_DEBUG, 0, N_("Generate VMS format debug info") },
967 #endif
968 { 0, 0, 0, 0 }
971 typedef struct
973 const char *const string;
974 int *const variable;
975 const int on_value;
976 const char *const description;
978 lang_independent_options;
980 int flag_trapv = 0;
982 /* Add or remove a leading underscore from user symbols. */
983 int flag_leading_underscore = -1;
985 /* The user symbol prefix after having resolved same. */
986 const char *user_label_prefix;
988 static const param_info lang_independent_params[] = {
989 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT) \
990 { OPTION, DEFAULT, HELP },
991 #include "params.def"
992 #undef DEFPARAM
993 { NULL, 0, NULL }
996 /* Table of language-independent -f options.
997 STRING is the option name. VARIABLE is the address of the variable.
998 ON_VALUE is the value to store in VARIABLE
999 if `-fSTRING' is seen as an option.
1000 (If `-fno-STRING' is seen as an option, the opposite value is stored.) */
1002 static const lang_independent_options f_options[] =
1004 {"eliminate-dwarf2-dups", &flag_eliminate_dwarf2_dups, 1,
1005 N_("Perform DWARF2 duplicate elimination") },
1006 {"eliminate-unused-debug-types", &flag_eliminate_unused_debug_types, 1,
1007 N_("Perform unused type elimination in debug info") },
1008 {"float-store", &flag_float_store, 1,
1009 N_("Do not store floats in registers") },
1010 {"defer-pop", &flag_defer_pop, 1,
1011 N_("Defer popping functions args from stack until later") },
1012 {"omit-frame-pointer", &flag_omit_frame_pointer, 1,
1013 N_("When possible do not generate stack frames") },
1014 {"optimize-sibling-calls", &flag_optimize_sibling_calls, 1,
1015 N_("Optimize sibling and tail recursive calls") },
1016 {"tracer", &flag_tracer, 1,
1017 N_("Perform superblock formation via tail duplication") },
1018 {"unit-at-a-time", &flag_unit_at_a_time, 1,
1019 N_("Compile whole compilation unit at a time") },
1020 {"cse-follow-jumps", &flag_cse_follow_jumps, 1,
1021 N_("When running CSE, follow jumps to their targets") },
1022 {"cse-skip-blocks", &flag_cse_skip_blocks, 1,
1023 N_("When running CSE, follow conditional jumps") },
1024 {"expensive-optimizations", &flag_expensive_optimizations, 1,
1025 N_("Perform a number of minor, expensive optimizations") },
1026 {"thread-jumps", &flag_thread_jumps, 1,
1027 N_("Perform jump threading optimizations") },
1028 {"strength-reduce", &flag_strength_reduce, 1,
1029 N_("Perform strength reduction optimizations") },
1030 {"unroll-loops", &flag_unroll_loops, 1,
1031 N_("Perform loop unrolling when iteration count is known") },
1032 {"unroll-all-loops", &flag_unroll_all_loops, 1,
1033 N_("Perform loop unrolling for all loops") },
1034 {"old-unroll-loops", &flag_old_unroll_loops, 1,
1035 N_("Perform loop unrolling when iteration count is known") },
1036 {"old-unroll-all-loops", &flag_old_unroll_all_loops, 1,
1037 N_("Perform loop unrolling for all loops") },
1038 {"peel-loops", &flag_peel_loops, 1,
1039 N_("Perform loop peeling") },
1040 {"unswitch-loops", &flag_unswitch_loops, 1,
1041 N_("Perform loop unswitching") },
1042 {"prefetch-loop-arrays", &flag_prefetch_loop_arrays, 1,
1043 N_("Generate prefetch instructions, if available, for arrays in loops") },
1044 {"move-all-movables", &flag_move_all_movables, 1,
1045 N_("Force all loop invariant computations out of loops") },
1046 {"reduce-all-givs", &flag_reduce_all_givs, 1,
1047 N_("Strength reduce all loop general induction variables") },
1048 {"writable-strings", &flag_writable_strings, 1,
1049 N_("Store strings in writable data section") },
1050 {"peephole", &flag_no_peephole, 0,
1051 N_("Enable machine specific peephole optimizations") },
1052 {"force-mem", &flag_force_mem, 1,
1053 N_("Copy memory operands into registers before using") },
1054 {"force-addr", &flag_force_addr, 1,
1055 N_("Copy memory address constants into regs before using") },
1056 {"function-cse", &flag_no_function_cse, 0,
1057 N_("Allow function addresses to be held in registers") },
1058 {"inline-functions", &flag_inline_functions, 1,
1059 N_("Integrate simple functions into their callers") },
1060 {"keep-inline-functions", &flag_keep_inline_functions, 1,
1061 N_("Generate code for funcs even if they are fully inlined") },
1062 {"inline", &flag_no_inline, 0,
1063 N_("Pay attention to the 'inline' keyword") },
1064 {"keep-static-consts", &flag_keep_static_consts, 1,
1065 N_("Emit static const variables even if they are not used") },
1066 {"syntax-only", &flag_syntax_only, 1,
1067 N_("Check for syntax errors, then stop") },
1068 {"shared-data", &flag_shared_data, 1,
1069 N_("Mark data as shared rather than private") },
1070 {"caller-saves", &flag_caller_saves, 1,
1071 N_("Enable saving registers around function calls") },
1072 {"pcc-struct-return", &flag_pcc_struct_return, 1,
1073 N_("Return 'short' aggregates in memory, not registers") },
1074 {"reg-struct-return", &flag_pcc_struct_return, 0,
1075 N_("Return 'short' aggregates in registers") },
1076 {"delayed-branch", &flag_delayed_branch, 1,
1077 N_("Attempt to fill delay slots of branch instructions") },
1078 {"gcse", &flag_gcse, 1,
1079 N_("Perform the global common subexpression elimination") },
1080 {"gcse-lm", &flag_gcse_lm, 1,
1081 N_("Perform enhanced load motion during global subexpression elimination") },
1082 {"gcse-sm", &flag_gcse_sm, 1,
1083 N_("Perform store motion after global subexpression elimination") },
1084 {"loop-optimize", &flag_loop_optimize, 1,
1085 N_("Perform the loop optimizations") },
1086 {"crossjumping", &flag_crossjumping, 1,
1087 N_("Perform cross-jumping optimization") },
1088 {"if-conversion", &flag_if_conversion, 1,
1089 N_("Perform conversion of conditional jumps to branchless equivalents") },
1090 {"if-conversion2", &flag_if_conversion2, 1,
1091 N_("Perform conversion of conditional jumps to conditional execution") },
1092 {"rerun-cse-after-loop", &flag_rerun_cse_after_loop, 1,
1093 N_("Run CSE pass after loop optimizations") },
1094 {"rerun-loop-opt", &flag_rerun_loop_opt, 1,
1095 N_("Run the loop optimizer twice") },
1096 {"delete-null-pointer-checks", &flag_delete_null_pointer_checks, 1,
1097 N_("Delete useless null pointer checks") },
1098 {"schedule-insns", &flag_schedule_insns, 1,
1099 N_("Reschedule instructions before register allocation") },
1100 {"schedule-insns2", &flag_schedule_insns_after_reload, 1,
1101 N_("Reschedule instructions after register allocation") },
1102 {"sched-interblock",&flag_schedule_interblock, 1,
1103 N_("Enable scheduling across basic blocks") },
1104 {"sched-spec",&flag_schedule_speculative, 1,
1105 N_("Allow speculative motion of non-loads") },
1106 {"sched-spec-load",&flag_schedule_speculative_load, 1,
1107 N_("Allow speculative motion of some loads") },
1108 {"sched-spec-load-dangerous",&flag_schedule_speculative_load_dangerous, 1,
1109 N_("Allow speculative motion of more loads") },
1110 {"sched2-use-superblocks", &flag_sched2_use_superblocks, 1,
1111 N_("If scheduling post reload, do superblock scheduling") },
1112 {"sched2-use-traces", &flag_sched2_use_traces, 1,
1113 N_("If scheduling post reload, do trace scheduling") },
1114 {"branch-count-reg",&flag_branch_on_count_reg, 1,
1115 N_("Replace add,compare,branch with branch on count reg") },
1116 {"pic", &flag_pic, 1,
1117 N_("Generate position independent code, if possible") },
1118 {"PIC", &flag_pic, 2, ""},
1119 {"exceptions", &flag_exceptions, 1,
1120 N_("Enable exception handling") },
1121 {"unwind-tables", &flag_unwind_tables, 1,
1122 N_("Just generate unwind tables for exception handling") },
1123 {"asynchronous-unwind-tables", &flag_asynchronous_unwind_tables, 1,
1124 N_("Generate unwind tables exact at each instruction boundary") },
1125 {"non-call-exceptions", &flag_non_call_exceptions, 1,
1126 N_("Support synchronous non-call exceptions") },
1127 {"profile-arcs", &profile_arc_flag, 1,
1128 N_("Insert arc based program profiling code") },
1129 {"test-coverage", &flag_test_coverage, 1,
1130 N_("Create data files needed by gcov") },
1131 {"branch-probabilities", &flag_branch_probabilities, 1,
1132 N_("Use profiling information for branch probabilities") },
1133 {"profile", &profile_flag, 1,
1134 N_("Enable basic program profiling code") },
1135 {"reorder-blocks", &flag_reorder_blocks, 1,
1136 N_("Reorder basic blocks to improve code placement") },
1137 {"reorder-functions", &flag_reorder_functions, 1,
1138 N_("Reorder functions to improve code placement") },
1139 {"rename-registers", &flag_rename_registers, 1,
1140 N_("Do the register renaming optimization pass") },
1141 {"cprop-registers", &flag_cprop_registers, 1,
1142 N_("Do the register copy-propagation optimization pass") },
1143 {"common", &flag_no_common, 0,
1144 N_("Do not put uninitialized globals in the common section") },
1145 {"inhibit-size-directive", &flag_inhibit_size_directive, 1,
1146 N_("Do not generate .size directives") },
1147 {"function-sections", &flag_function_sections, 1,
1148 N_("place each function into its own section") },
1149 {"data-sections", &flag_data_sections, 1,
1150 N_("place data items into their own section") },
1151 {"verbose-asm", &flag_verbose_asm, 1,
1152 N_("Add extra commentary to assembler output") },
1153 {"gnu-linker", &flag_gnu_linker, 1,
1154 N_("Output GNU ld formatted global initializers") },
1155 {"regmove", &flag_regmove, 1,
1156 N_("Enables a register move optimization") },
1157 {"optimize-register-move", &flag_regmove, 1,
1158 N_("Do the full regmove optimization pass") },
1159 {"pack-struct", &flag_pack_struct, 1,
1160 N_("Pack structure members together without holes") },
1161 {"stack-check", &flag_stack_check, 1,
1162 N_("Insert stack checking code into the program") },
1163 {"argument-alias", &flag_argument_noalias, 0,
1164 N_("Specify that arguments may alias each other & globals") },
1165 {"argument-noalias", &flag_argument_noalias, 1,
1166 N_("Assume arguments may alias globals but not each other") },
1167 {"argument-noalias-global", &flag_argument_noalias, 2,
1168 N_("Assume arguments do not alias each other or globals") },
1169 {"strict-aliasing", &flag_strict_aliasing, 1,
1170 N_("Assume strict aliasing rules apply") },
1171 {"align-loops", &align_loops, 0,
1172 N_("Align the start of loops") },
1173 {"align-jumps", &align_jumps, 0,
1174 N_("Align labels which are only reached by jumping") },
1175 {"align-labels", &align_labels, 0,
1176 N_("Align all labels") },
1177 {"align-functions", &align_functions, 0,
1178 N_("Align the start of functions") },
1179 {"merge-constants", &flag_merge_constants, 1,
1180 N_("Attempt to merge identical constants across compilation units") },
1181 {"merge-all-constants", &flag_merge_constants, 2,
1182 N_("Attempt to merge identical constants and constant variables") },
1183 {"dump-unnumbered", &flag_dump_unnumbered, 1,
1184 N_("Suppress output of instruction numbers and line number notes in debugging dumps") },
1185 {"instrument-functions", &flag_instrument_function_entry_exit, 1,
1186 N_("Instrument function entry/exit with profiling calls") },
1187 {"zero-initialized-in-bss", &flag_zero_initialized_in_bss, 1,
1188 N_("Put zero initialized data in the bss section") },
1189 {"ssa", &flag_ssa, 1,
1190 N_("Enable SSA optimizations") },
1191 {"ssa-ccp", &flag_ssa_ccp, 1,
1192 N_("Enable SSA conditional constant propagation") },
1193 {"ssa-dce", &flag_ssa_dce, 1,
1194 N_("Enable aggressive SSA dead code elimination") },
1195 {"leading-underscore", &flag_leading_underscore, 1,
1196 N_("External symbols have a leading underscore") },
1197 {"ident", &flag_no_ident, 0,
1198 N_("Process #ident directives") },
1199 { "peephole2", &flag_peephole2, 1,
1200 N_("Enables an rtl peephole pass run before sched2") },
1201 {"finite-math-only", &flag_finite_math_only, 1,
1202 N_("Assume no NaNs or +-Infs are generated") },
1203 { "guess-branch-probability", &flag_guess_branch_prob, 1,
1204 N_("Enables guessing of branch probabilities") },
1205 {"math-errno", &flag_errno_math, 1,
1206 N_("Set errno after built-in math functions") },
1207 {"trapping-math", &flag_trapping_math, 1,
1208 N_("Floating-point operations can trap") },
1209 {"unsafe-math-optimizations", &flag_unsafe_math_optimizations, 1,
1210 N_("Allow math optimizations that may violate IEEE or ANSI standards") },
1211 {"signaling-nans", &flag_signaling_nans, 1,
1212 N_("Disable optimizations observable by IEEE signaling NaNs") },
1213 {"bounds-check", &flag_bounds_check, 1,
1214 N_("Generate code to check bounds before indexing arrays") },
1215 {"single-precision-constant", &flag_single_precision_constant, 1,
1216 N_("Convert floating point constant to single precision constant") },
1217 {"time-report", &time_report, 1,
1218 N_("Report time taken by each compiler pass at end of run") },
1219 {"mem-report", &mem_report, 1,
1220 N_("Report on permanent memory allocation at end of run") },
1221 { "trapv", &flag_trapv, 1,
1222 N_("Trap for signed overflow in addition / subtraction / multiplication") },
1223 { "new-ra", &flag_new_regalloc, 1,
1224 N_("Use graph coloring register allocation.") },
1227 /* Table of language-specific options. */
1229 static const struct lang_opt
1231 const char *const option;
1232 const char *const description;
1234 documented_lang_options[] =
1236 /* In order not to overload the --help output, the convention
1237 used here is to only describe those options which are not
1238 enabled by default. */
1240 { "-ansi",
1241 N_("Compile just for ISO C90") },
1242 { "-std= ",
1243 N_("Determine language standard") },
1245 { "-fsigned-bitfields", "" },
1246 { "-funsigned-bitfields",
1247 N_("Make bit-fields by unsigned by default") },
1248 { "-fno-signed-bitfields", "" },
1249 { "-fno-unsigned-bitfields","" },
1250 { "-fsigned-char",
1251 N_("Make 'char' be signed by default") },
1252 { "-funsigned-char",
1253 N_("Make 'char' be unsigned by default") },
1254 { "-fno-signed-char", "" },
1255 { "-fno-unsigned-char", "" },
1257 { "-fasm", "" },
1258 { "-fno-asm",
1259 N_("Do not recognize the 'asm' keyword") },
1260 { "-fbuiltin", "" },
1261 { "-fno-builtin",
1262 N_("Do not recognize any built in functions") },
1263 { "-fhosted",
1264 N_("Assume normal C execution environment") },
1265 { "-fno-hosted", "" },
1266 { "-ffreestanding",
1267 N_("Assume that standard libraries & main might not exist") },
1268 { "-fno-freestanding", "" },
1269 { "-fcond-mismatch",
1270 N_("Allow different types as args of ? operator") },
1271 { "-fno-cond-mismatch", "" },
1272 { "-fdollars-in-identifiers",
1273 N_("Allow the use of $ inside identifiers") },
1274 { "-fno-dollars-in-identifiers", "" },
1275 { "-fpreprocessed", "" },
1276 { "-fno-preprocessed", "" },
1277 { "-fshort-double",
1278 N_("Use the same size for double as for float") },
1279 { "-fno-short-double", "" },
1280 { "-fshort-enums",
1281 N_("Use the smallest fitting integer to hold enums") },
1282 { "-fno-short-enums", "" },
1283 { "-fshort-wchar",
1284 N_("Override the underlying type for wchar_t to `unsigned short'") },
1285 { "-fno-short-wchar", "" },
1287 { "-Wall",
1288 N_("Enable most warning messages") },
1289 { "-Wbad-function-cast",
1290 N_("Warn about casting functions to incompatible types") },
1291 { "-Wno-bad-function-cast", "" },
1292 { "-Wmissing-format-attribute",
1293 N_("Warn about functions which might be candidates for format attributes") },
1294 { "-Wno-missing-format-attribute", "" },
1295 { "-Wcast-qual",
1296 N_("Warn about casts which discard qualifiers") },
1297 { "-Wno-cast-qual", "" },
1298 { "-Wchar-subscripts",
1299 N_("Warn about subscripts whose type is 'char'") },
1300 { "-Wno-char-subscripts", "" },
1301 { "-Wcomment",
1302 N_("Warn if nested comments are detected") },
1303 { "-Wno-comment", "" },
1304 { "-Wcomments",
1305 N_("Warn if nested comments are detected") },
1306 { "-Wno-comments", "" },
1307 { "-Wconversion",
1308 N_("Warn about possibly confusing type conversions") },
1309 { "-Wno-conversion", "" },
1310 { "-Wdiv-by-zero", "" },
1311 { "-Wno-div-by-zero",
1312 N_("Do not warn about compile-time integer division by zero") },
1313 { "-Wfloat-equal",
1314 N_("Warn about testing equality of floating point numbers") },
1315 { "-Wno-float-equal", "" },
1316 { "-Wformat",
1317 N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
1318 { "-Wno-format", "" },
1319 { "-Wformat-extra-args", "" },
1320 { "-Wno-format-extra-args",
1321 N_("Don't warn about too many arguments to format functions") },
1322 { "-Wformat-nonliteral",
1323 N_("Warn about non-string-literal format strings") },
1324 { "-Wno-format-nonliteral", "" },
1325 { "-Wformat-security",
1326 N_("Warn about possible security problems with format functions") },
1327 { "-Wno-format-security", "" },
1328 { "-Wformat-y2k", "" },
1329 { "-Wno-format-y2k",
1330 N_("Don't warn about strftime formats yielding 2 digit years") },
1331 { "-Wimplicit-function-declaration",
1332 N_("Warn about implicit function declarations") },
1333 { "-Wno-implicit-function-declaration", "" },
1334 { "-Werror-implicit-function-declaration", "" },
1335 { "-Wimplicit-int",
1336 N_("Warn when a declaration does not specify a type") },
1337 { "-Wno-implicit-int", "" },
1338 { "-Wimplicit", "" },
1339 { "-Wno-implicit", "" },
1340 { "-Wimport",
1341 N_("Warn about the use of the #import directive") },
1342 { "-Wno-import", "" },
1343 { "-Winvalid-pch",
1344 N_("Warn about PCH files that are found but not used") },
1345 { "-Wlong-long","" },
1346 { "-Wno-long-long",
1347 N_("Do not warn about using 'long long' when -pedantic") },
1348 { "-Wmain",
1349 N_("Warn about suspicious declarations of main") },
1350 { "-Wno-main", "" },
1351 { "-Wmissing-braces",
1352 N_("Warn about possibly missing braces around initializers") },
1353 { "-Wno-missing-braces", "" },
1354 { "-Wmissing-declarations",
1355 N_("Warn about global funcs without previous declarations") },
1356 { "-Wno-missing-declarations", "" },
1357 { "-Wmissing-prototypes",
1358 N_("Warn about global funcs without prototypes") },
1359 { "-Wno-missing-prototypes", "" },
1360 { "-Wmultichar",
1361 N_("Warn about use of multicharacter literals") },
1362 { "-Wno-multichar", "" },
1363 { "-Wnested-externs",
1364 N_("Warn about externs not at file scope level") },
1365 { "-Wno-nested-externs", "" },
1366 { "-Wparentheses",
1367 N_("Warn about possible missing parentheses") },
1368 { "-Wno-parentheses", "" },
1369 { "-Wpointer-arith",
1370 N_("Warn about function pointer arithmetic") },
1371 { "-Wno-pointer-arith", "" },
1372 { "-Wredundant-decls",
1373 N_("Warn about multiple declarations of the same object") },
1374 { "-Wno-redundant-decls", "" },
1375 { "-Wreturn-type",
1376 N_("Warn whenever a function's return-type defaults to int") },
1377 { "-Wno-return-type", "" },
1378 { "-Wsequence-point",
1379 N_("Warn about possible violations of sequence point rules") },
1380 { "-Wno-sequence-point", "" },
1381 { "-Wsign-compare",
1382 N_("Warn about signed/unsigned comparisons") },
1383 { "-Wno-sign-compare", "" },
1384 { "-Wstrict-prototypes",
1385 N_("Warn about non-prototyped function decls") },
1386 { "-Wno-strict-prototypes", "" },
1387 { "-Wtraditional",
1388 N_("Warn about constructs whose meanings change in ISO C") },
1389 { "-Wno-traditional", "" },
1390 { "-Wtrigraphs",
1391 N_("Warn when trigraphs are encountered") },
1392 { "-Wno-trigraphs", "" },
1393 { "-Wundef", "" },
1394 { "-Wno-undef", "" },
1395 { "-Wunknown-pragmas",
1396 N_("Warn about unrecognized pragmas") },
1397 { "-Wno-unknown-pragmas", "" },
1398 { "-Wwrite-strings",
1399 N_("Mark strings as 'const char *'") },
1400 { "-Wno-write-strings", "" },
1402 #define DEFINE_LANG_NAME(NAME) { NULL, NAME },
1404 #include "options.h"
1408 /* Here is a table, controlled by the tm.h file, listing each -m switch
1409 and which bits in `target_switches' it should set or clear.
1410 If VALUE is positive, it is bits to set.
1411 If VALUE is negative, -VALUE is bits to clear.
1412 (The sign bit is not used so there is no confusion.) */
1414 static const struct
1416 const char *const name;
1417 const int value;
1418 const char *const description;
1420 target_switches[] = TARGET_SWITCHES;
1422 /* This table is similar, but allows the switch to have a value. */
1424 #ifdef TARGET_OPTIONS
1425 static const struct
1427 const char *const prefix;
1428 const char **const variable;
1429 const char *const description;
1430 const char *const value;
1432 target_options[] = TARGET_OPTIONS;
1433 #endif
1435 /* Options controlling warnings. */
1437 /* Don't print warning messages. -w. */
1439 int inhibit_warnings = 0;
1441 /* Don't suppress warnings from system headers. -Wsystem-headers. */
1443 int warn_system_headers = 0;
1445 /* Print various extra warnings. -W/-Wextra. */
1447 int extra_warnings = 0;
1449 /* Treat warnings as errors. -Werror. */
1451 int warnings_are_errors = 0;
1453 /* Nonzero to warn about unused variables, functions et.al. */
1455 int warn_unused_function;
1456 int warn_unused_label;
1457 int warn_unused_parameter;
1458 int warn_unused_variable;
1459 int warn_unused_value;
1461 /* Used for cooperation between set_Wunused and set_Wextra. */
1462 static int maybe_warn_unused_parameter;
1464 /* Nonzero to warn about code which is never reached. */
1466 int warn_notreached;
1468 /* Nonzero to warn about variables used before they are initialized. */
1470 int warn_uninitialized;
1472 /* Nonzero means warn about all declarations which shadow others. */
1474 int warn_shadow;
1476 /* Warn if a switch on an enum, that does not have a default case,
1477 fails to have a case for every enum value. */
1479 int warn_switch;
1481 /* Warn if a switch does not have a default case. */
1483 int warn_switch_default;
1485 /* Warn if a switch on an enum fails to have a case for every enum
1486 value (regardless of the presence or otherwise of a default case). */
1488 int warn_switch_enum;
1490 /* Nonzero means warn about function definitions that default the return type
1491 or that use a null return and have a return-type other than void. */
1493 int warn_return_type;
1495 /* Nonzero means warn about pointer casts that increase the required
1496 alignment of the target type (and might therefore lead to a crash
1497 due to a misaligned access). */
1499 int warn_cast_align;
1501 /* Nonzero means warn about any objects definitions whose size is larger
1502 than N bytes. Also want about function definitions whose returned
1503 values are larger than N bytes. The value N is in `larger_than_size'. */
1505 int warn_larger_than;
1506 HOST_WIDE_INT larger_than_size;
1508 /* Nonzero means warn if inline function is too large. */
1510 int warn_inline;
1512 /* Warn if a function returns an aggregate,
1513 since there are often incompatible calling conventions for doing this. */
1515 int warn_aggregate_return;
1517 /* Warn if packed attribute on struct is unnecessary and inefficient. */
1519 int warn_packed;
1521 /* Warn when gcc pads a structure to an alignment boundary. */
1523 int warn_padded;
1525 /* Warn when an optimization pass is disabled. */
1527 int warn_disabled_optimization;
1529 /* Warn about functions which might be candidates for attribute noreturn. */
1531 int warn_missing_noreturn;
1533 /* Nonzero means warn about uses of __attribute__((deprecated))
1534 declarations. */
1536 int warn_deprecated_decl = 1;
1538 /* Nonzero means warn about constructs which might not be
1539 strict-aliasing safe. */
1541 int warn_strict_aliasing;
1543 /* Like f_options, but for -W. */
1545 static const lang_independent_options W_options[] =
1547 {"unused-function", &warn_unused_function, 1,
1548 N_("Warn when a function is unused") },
1549 {"unused-label", &warn_unused_label, 1,
1550 N_("Warn when a label is unused") },
1551 {"unused-parameter", &warn_unused_parameter, 1,
1552 N_("Warn when a function parameter is unused") },
1553 {"unused-variable", &warn_unused_variable, 1,
1554 N_("Warn when a variable is unused") },
1555 {"unused-value", &warn_unused_value, 1,
1556 N_("Warn when an expression value is unused") },
1557 {"system-headers", &warn_system_headers, 1,
1558 N_("Do not suppress warnings from system headers") },
1559 {"error", &warnings_are_errors, 1,
1560 N_("Treat all warnings as errors") },
1561 {"shadow", &warn_shadow, 1,
1562 N_("Warn when one local variable shadows another") },
1563 {"switch", &warn_switch, 1,
1564 N_("Warn about enumerated switches, with no default, missing a case") },
1565 {"switch-default", &warn_switch_default, 1,
1566 N_("Warn about enumerated switches missing a default case") },
1567 {"switch-enum", &warn_switch_enum, 1,
1568 N_("Warn about all enumerated switches missing a specific case") },
1569 {"aggregate-return", &warn_aggregate_return, 1,
1570 N_("Warn about returning structures, unions or arrays") },
1571 {"cast-align", &warn_cast_align, 1,
1572 N_("Warn about pointer casts which increase alignment") },
1573 {"unreachable-code", &warn_notreached, 1,
1574 N_("Warn about code that will never be executed") },
1575 {"uninitialized", &warn_uninitialized, 1,
1576 N_("Warn about uninitialized automatic variables") },
1577 {"inline", &warn_inline, 1,
1578 N_("Warn when an inlined function cannot be inlined") },
1579 {"packed", &warn_packed, 1,
1580 N_("Warn when the packed attribute has no effect on struct layout") },
1581 {"padded", &warn_padded, 1,
1582 N_("Warn when padding is required to align struct members") },
1583 {"disabled-optimization", &warn_disabled_optimization, 1,
1584 N_("Warn when an optimization pass is disabled") },
1585 {"deprecated-declarations", &warn_deprecated_decl, 1,
1586 N_("Warn about uses of __attribute__((deprecated)) declarations") },
1587 {"missing-noreturn", &warn_missing_noreturn, 1,
1588 N_("Warn about functions which might be candidates for attribute noreturn") },
1589 {"strict-aliasing", &warn_strict_aliasing, 1,
1590 N_ ("Warn about code which might break the strict aliasing rules") }
1593 void
1594 set_Wunused (setting)
1595 int setting;
1597 warn_unused_function = setting;
1598 warn_unused_label = setting;
1599 /* Unused function parameter warnings are reported when either
1600 ``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
1601 Thus, if -Wextra has already been seen, set warn_unused_parameter;
1602 otherwise set maybe_warn_extra_parameter, which will be picked up
1603 by set_Wextra. */
1604 maybe_warn_unused_parameter = setting;
1605 warn_unused_parameter = (setting && extra_warnings);
1606 warn_unused_variable = setting;
1607 warn_unused_value = setting;
1610 static void
1611 set_Wextra (setting)
1612 int setting;
1614 extra_warnings = setting;
1615 warn_unused_value = setting;
1616 warn_unused_parameter = (setting && maybe_warn_unused_parameter);
1618 /* We save the value of warn_uninitialized, since if they put
1619 -Wuninitialized on the command line, we need to generate a
1620 warning about not using it without also specifying -O. */
1621 if (setting == 0)
1622 warn_uninitialized = 0;
1623 else if (warn_uninitialized != 1)
1624 warn_uninitialized = 2;
1627 /* The following routines are useful in setting all the flags that
1628 -ffast-math and -fno-fast-math imply. */
1630 void
1631 set_fast_math_flags (set)
1632 int set;
1634 flag_trapping_math = !set;
1635 flag_unsafe_math_optimizations = set;
1636 flag_finite_math_only = set;
1637 flag_errno_math = !set;
1638 if (set)
1639 flag_signaling_nans = 0;
1642 /* Return true iff flags are set as if -ffast-math. */
1643 bool
1644 fast_math_flags_set_p ()
1646 return (!flag_trapping_math
1647 && flag_unsafe_math_optimizations
1648 && flag_finite_math_only
1649 && !flag_errno_math);
1653 /* Output files for assembler code (real compiler output)
1654 and debugging dumps. */
1656 FILE *asm_out_file;
1657 FILE *aux_info_file;
1658 FILE *rtl_dump_file = NULL;
1660 /* Decode the string P as an integral parameter.
1661 If the string is indeed an integer return its numeric value else
1662 issue an Invalid Option error for the option PNAME and return DEFVAL.
1663 If PNAME is zero just return DEFVAL, do not call error. */
1666 read_integral_parameter (p, pname, defval)
1667 const char *p;
1668 const char *pname;
1669 const int defval;
1671 const char *endp = p;
1673 while (*endp)
1675 if (ISDIGIT (*endp))
1676 endp++;
1677 else
1678 break;
1681 if (*endp != 0)
1683 if (pname != 0)
1684 error ("invalid option argument `%s'", pname);
1685 return defval;
1688 return atoi (p);
1691 /* This calls abort and is used to avoid problems when abort is a macro.
1692 It is used when we need to pass the address of abort. */
1694 void
1695 do_abort ()
1697 abort ();
1700 /* When `malloc.c' is compiled with `rcheck' defined,
1701 it calls this function to report clobberage. */
1703 void
1704 botch (s)
1705 const char *s ATTRIBUTE_UNUSED;
1707 abort ();
1710 /* Return the logarithm of X, base 2, considering X unsigned,
1711 if X is a power of 2. Otherwise, returns -1.
1713 This should be used via the `exact_log2' macro. */
1716 exact_log2_wide (x)
1717 unsigned HOST_WIDE_INT x;
1719 int log = 0;
1720 /* Test for 0 or a power of 2. */
1721 if (x == 0 || x != (x & -x))
1722 return -1;
1723 while ((x >>= 1) != 0)
1724 log++;
1725 return log;
1728 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
1729 If X is 0, return -1.
1731 This should be used via the floor_log2 macro. */
1734 floor_log2_wide (x)
1735 unsigned HOST_WIDE_INT x;
1737 int log = -1;
1738 while (x != 0)
1739 log++,
1740 x >>= 1;
1741 return log;
1744 /* Handler for fatal signals, such as SIGSEGV. These are transformed
1745 into ICE messages, which is much more user friendly. */
1747 static void
1748 crash_signal (signo)
1749 int signo;
1751 internal_error ("%s", strsignal (signo));
1754 /* Arrange to dump core on error. (The regular error message is still
1755 printed first, except in the case of abort().) */
1757 static void
1758 setup_core_dumping ()
1760 #ifdef SIGABRT
1761 signal (SIGABRT, SIG_DFL);
1762 #endif
1763 #if defined(HAVE_SETRLIMIT)
1765 struct rlimit rlim;
1766 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
1767 fatal_io_error ("getting core file size maximum limit");
1768 rlim.rlim_cur = rlim.rlim_max;
1769 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
1770 fatal_io_error ("setting core file size limit to maximum");
1772 #endif
1773 diagnostic_abort_on_error (global_dc);
1777 /* Strip off a legitimate source ending from the input string NAME of
1778 length LEN. Rather than having to know the names used by all of
1779 our front ends, we strip off an ending of a period followed by
1780 up to five characters. (Java uses ".class".) */
1782 void
1783 strip_off_ending (name, len)
1784 char *name;
1785 int len;
1787 int i;
1788 for (i = 2; i < 6 && len > i; i++)
1790 if (name[len - i] == '.')
1792 name[len - i] = '\0';
1793 break;
1798 /* Output a quoted string. */
1800 void
1801 output_quoted_string (asm_file, string)
1802 FILE *asm_file;
1803 const char *string;
1805 #ifdef OUTPUT_QUOTED_STRING
1806 OUTPUT_QUOTED_STRING (asm_file, string);
1807 #else
1808 char c;
1810 putc ('\"', asm_file);
1811 while ((c = *string++) != 0)
1813 if (ISPRINT (c))
1815 if (c == '\"' || c == '\\')
1816 putc ('\\', asm_file);
1817 putc (c, asm_file);
1819 else
1820 fprintf (asm_file, "\\%03o", (unsigned char) c);
1822 putc ('\"', asm_file);
1823 #endif
1826 /* Output NAME into FILE after having turned it into something
1827 usable as an identifier in a target's assembly file. */
1828 void
1829 output_clean_symbol_name (file, name)
1830 FILE *file;
1831 const char *name;
1833 /* Make a copy of NAME. */
1834 char *id = xstrdup (name);
1836 /* Make it look like a valid identifier for an assembler. */
1837 clean_symbol_name (id);
1839 fputs (id, file);
1840 free (id);
1844 /* Output a file name in the form wanted by System V. */
1846 void
1847 output_file_directive (asm_file, input_name)
1848 FILE *asm_file;
1849 const char *input_name;
1851 int len = strlen (input_name);
1852 const char *na = input_name + len;
1854 /* NA gets INPUT_NAME sans directory names. */
1855 while (na > input_name)
1857 if (IS_DIR_SEPARATOR (na[-1]))
1858 break;
1859 na--;
1862 #ifdef ASM_OUTPUT_MAIN_SOURCE_FILENAME
1863 ASM_OUTPUT_MAIN_SOURCE_FILENAME (asm_file, na);
1864 #else
1865 #ifdef ASM_OUTPUT_SOURCE_FILENAME
1866 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
1867 #else
1868 fprintf (asm_file, "\t.file\t");
1869 output_quoted_string (asm_file, na);
1870 fputc ('\n', asm_file);
1871 #endif
1872 #endif
1875 /* Routine to open a dump file. Return true if the dump file is enabled. */
1877 static int
1878 open_dump_file (index, decl)
1879 enum dump_file_index index;
1880 tree decl;
1882 char *dump_name;
1883 const char *open_arg;
1884 char seq[16];
1886 if (! dump_file[index].enabled)
1887 return 0;
1889 timevar_push (TV_DUMP);
1890 if (rtl_dump_file != NULL)
1891 fclose (rtl_dump_file);
1893 sprintf (seq, DUMPFILE_FORMAT, index);
1895 if (! dump_file[index].initialized)
1897 /* If we've not initialized the files, do so now. */
1898 if (graph_dump_format != no_graph
1899 && dump_file[index].graph_dump_p)
1901 dump_name = concat (seq, dump_file[index].extension, NULL);
1902 clean_graph_dump_file (dump_base_name, dump_name);
1903 free (dump_name);
1905 dump_file[index].initialized = 1;
1906 open_arg = "w";
1908 else
1909 open_arg = "a";
1911 dump_name = concat (dump_base_name, seq,
1912 dump_file[index].extension, NULL);
1914 rtl_dump_file = fopen (dump_name, open_arg);
1915 if (rtl_dump_file == NULL)
1916 fatal_io_error ("can't open %s", dump_name);
1918 free (dump_name);
1920 if (decl)
1921 fprintf (rtl_dump_file, "\n;; Function %s%s\n\n",
1922 (*lang_hooks.decl_printable_name) (decl, 2),
1923 cfun->function_frequency == FUNCTION_FREQUENCY_HOT
1924 ? " (hot)"
1925 : cfun->function_frequency == FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
1926 ? " (unlikely executed)"
1927 : "");
1929 timevar_pop (TV_DUMP);
1930 return 1;
1933 /* Routine to close a dump file. */
1935 static void
1936 close_dump_file (index, func, insns)
1937 enum dump_file_index index;
1938 void (*func) PARAMS ((FILE *, rtx));
1939 rtx insns;
1941 if (! rtl_dump_file)
1942 return;
1944 timevar_push (TV_DUMP);
1945 if (insns
1946 && graph_dump_format != no_graph
1947 && dump_file[index].graph_dump_p)
1949 char seq[16];
1950 char *suffix;
1952 sprintf (seq, DUMPFILE_FORMAT, index);
1953 suffix = concat (seq, dump_file[index].extension, NULL);
1954 print_rtl_graph_with_bb (dump_base_name, suffix, insns);
1955 free (suffix);
1958 if (func && insns)
1959 func (rtl_dump_file, insns);
1961 fflush (rtl_dump_file);
1962 fclose (rtl_dump_file);
1964 rtl_dump_file = NULL;
1965 timevar_pop (TV_DUMP);
1968 /* Do any final processing required for the declarations in VEC, of
1969 which there are LEN. We write out inline functions and variables
1970 that have been deferred until this point, but which are required.
1971 Returns nonzero if anything was put out. */
1974 wrapup_global_declarations (vec, len)
1975 tree *vec;
1976 int len;
1978 tree decl;
1979 int i;
1980 int reconsider;
1981 int output_something = 0;
1983 for (i = 0; i < len; i++)
1985 decl = vec[i];
1987 /* We're not deferring this any longer. Assignment is
1988 conditional to avoid needlessly dirtying PCH pages. */
1989 if (DECL_DEFER_OUTPUT (decl) != 0)
1990 DECL_DEFER_OUTPUT (decl) = 0;
1992 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
1993 (*lang_hooks.finish_incomplete_decl) (decl);
1996 /* Now emit any global variables or functions that we have been
1997 putting off. We need to loop in case one of the things emitted
1998 here references another one which comes earlier in the list. */
2001 reconsider = 0;
2002 for (i = 0; i < len; i++)
2004 decl = vec[i];
2006 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
2007 continue;
2009 /* Don't write out static consts, unless we still need them.
2011 We also keep static consts if not optimizing (for debugging),
2012 unless the user specified -fno-keep-static-consts.
2013 ??? They might be better written into the debug information.
2014 This is possible when using DWARF.
2016 A language processor that wants static constants to be always
2017 written out (even if it is not used) is responsible for
2018 calling rest_of_decl_compilation itself. E.g. the C front-end
2019 calls rest_of_decl_compilation from finish_decl.
2020 One motivation for this is that is conventional in some
2021 environments to write things like:
2022 static const char rcsid[] = "... version string ...";
2023 intending to force the string to be in the executable.
2025 A language processor that would prefer to have unneeded
2026 static constants "optimized away" would just defer writing
2027 them out until here. E.g. C++ does this, because static
2028 constants are often defined in header files.
2030 ??? A tempting alternative (for both C and C++) would be
2031 to force a constant to be written if and only if it is
2032 defined in a main file, as opposed to an include file. */
2034 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
2036 bool needed = 1;
2038 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2039 /* needed */;
2040 else if (DECL_COMDAT (decl))
2041 needed = 0;
2042 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
2043 && (optimize || !flag_keep_static_consts
2044 || DECL_ARTIFICIAL (decl)))
2045 needed = 0;
2047 if (needed)
2049 reconsider = 1;
2050 rest_of_decl_compilation (decl, NULL, 1, 1);
2054 if (TREE_CODE (decl) == FUNCTION_DECL
2055 && DECL_INITIAL (decl) != 0
2056 && DECL_SAVED_INSNS (decl) != 0
2057 && (flag_keep_inline_functions
2058 || (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
2059 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
2061 reconsider = 1;
2062 output_inline_function (decl);
2066 if (reconsider)
2067 output_something = 1;
2069 while (reconsider);
2071 return output_something;
2074 /* Issue appropriate warnings for the global declarations in VEC (of
2075 which there are LEN). Output debugging information for them. */
2077 void
2078 check_global_declarations (vec, len)
2079 tree *vec;
2080 int len;
2082 tree decl;
2083 int i;
2085 for (i = 0; i < len; i++)
2087 decl = vec[i];
2089 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
2090 && ! TREE_ASM_WRITTEN (decl))
2091 /* Cancel the RTL for this decl so that, if debugging info
2092 output for global variables is still to come,
2093 this one will be omitted. */
2094 SET_DECL_RTL (decl, NULL_RTX);
2096 /* Warn about any function
2097 declared static but not defined.
2098 We don't warn about variables,
2099 because many programs have static variables
2100 that exist only to get some text into the object file. */
2101 if (TREE_CODE (decl) == FUNCTION_DECL
2102 && (warn_unused_function
2103 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2104 && DECL_INITIAL (decl) == 0
2105 && DECL_EXTERNAL (decl)
2106 && ! DECL_ARTIFICIAL (decl)
2107 && ! TREE_PUBLIC (decl))
2109 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
2110 pedwarn_with_decl (decl,
2111 "`%s' used but never defined");
2112 else
2113 warning_with_decl (decl,
2114 "`%s' declared `static' but never defined");
2115 /* This symbol is effectively an "extern" declaration now. */
2116 TREE_PUBLIC (decl) = 1;
2117 assemble_external (decl);
2120 /* Warn about static fns or vars defined but not used. */
2121 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
2122 || (warn_unused_variable && TREE_CODE (decl) == VAR_DECL))
2123 && ! TREE_USED (decl)
2124 /* The TREE_USED bit for file-scope decls is kept in the identifier,
2125 to handle multiple external decls in different scopes. */
2126 && ! TREE_USED (DECL_NAME (decl))
2127 && ! DECL_EXTERNAL (decl)
2128 && ! TREE_PUBLIC (decl)
2129 /* A volatile variable might be used in some non-obvious way. */
2130 && ! TREE_THIS_VOLATILE (decl)
2131 /* Global register variables must be declared to reserve them. */
2132 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
2133 /* Otherwise, ask the language. */
2134 && (*lang_hooks.decls.warn_unused_global) (decl))
2135 warning_with_decl (decl, "`%s' defined but not used");
2137 /* Avoid confusing the debug information machinery when there are
2138 errors. */
2139 if (errorcount == 0 && sorrycount == 0)
2141 timevar_push (TV_SYMOUT);
2142 (*debug_hooks->global_decl) (decl);
2143 timevar_pop (TV_SYMOUT);
2148 /* Save the current INPUT_LOCATION on the top entry in the
2149 INPUT_FILE_STACK. Push a new entry for FILE and LINE, and set the
2150 INPUT_LOCATION accordingly. */
2152 void
2153 push_srcloc (file, line)
2154 const char *file;
2155 int line;
2157 struct file_stack *fs;
2159 if (input_file_stack)
2160 input_file_stack->location = input_location;
2162 fs = (struct file_stack *) xmalloc (sizeof (struct file_stack));
2163 input_filename = file;
2164 input_line = line;
2165 fs->location = input_location;
2166 fs->next = input_file_stack;
2167 input_file_stack = fs;
2168 input_file_stack_tick++;
2171 /* Pop the top entry off the stack of presently open source files.
2172 Restore the INPUT_LOCATION from the new topmost entry on the
2173 stack. */
2175 void
2176 pop_srcloc ()
2178 struct file_stack *fs;
2180 fs = input_file_stack;
2181 input_file_stack = fs->next;
2182 free (fs);
2183 input_file_stack_tick++;
2185 if (input_file_stack)
2186 input_location = input_file_stack->location;
2187 else
2189 input_filename = NULL;
2190 input_line = 0;
2194 /* Compile an entire translation unit. Write a file of assembly
2195 output and various debugging dumps. */
2197 static void
2198 compile_file ()
2200 /* Initialize yet another pass. */
2202 init_final (main_input_filename);
2203 coverage_init (aux_base_name);
2205 timevar_push (TV_PARSE);
2207 /* Call the parser, which parses the entire file (calling
2208 rest_of_compilation for each function). */
2209 (*lang_hooks.parse_file) (set_yydebug);
2211 /* In case there were missing block closers,
2212 get us back to the global binding level. */
2213 (*lang_hooks.clear_binding_stack) ();
2215 /* Compilation is now finished except for writing
2216 what's left of the symbol table output. */
2217 timevar_pop (TV_PARSE);
2219 if (flag_syntax_only)
2220 return;
2222 (*lang_hooks.decls.final_write_globals)();
2224 /* This must occur after the loop to output deferred functions.
2225 Else the coverage initializer would not be emitted if all the
2226 functions in this compilation unit were deferred. */
2227 coverage_finish ();
2229 /* Write out any pending weak symbol declarations. */
2231 weak_finish ();
2233 /* Do dbx symbols. */
2234 timevar_push (TV_SYMOUT);
2236 #ifdef DWARF2_UNWIND_INFO
2237 if (dwarf2out_do_frame ())
2238 dwarf2out_frame_finish ();
2239 #endif
2241 (*debug_hooks->finish) (main_input_filename);
2242 timevar_pop (TV_SYMOUT);
2244 /* Output some stuff at end of file if nec. */
2246 dw2_output_indirect_constants ();
2248 if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
2250 timevar_push (TV_DUMP);
2251 open_dump_file (DFI_bp, NULL);
2253 end_branch_prob ();
2255 close_dump_file (DFI_bp, NULL, NULL_RTX);
2256 timevar_pop (TV_DUMP);
2259 #ifdef ASM_FILE_END
2260 ASM_FILE_END (asm_out_file);
2261 #endif
2263 /* Attach a special .ident directive to the end of the file to identify
2264 the version of GCC which compiled this code. The format of the .ident
2265 string is patterned after the ones produced by native SVR4 compilers. */
2266 #ifdef IDENT_ASM_OP
2267 if (!flag_no_ident)
2268 fprintf (asm_out_file, "%s\"GCC: (GNU) %s\"\n",
2269 IDENT_ASM_OP, version_string);
2270 #endif
2272 if (optimize > 0 && open_dump_file (DFI_combine, NULL))
2274 timevar_push (TV_DUMP);
2275 dump_combine_total_stats (rtl_dump_file);
2276 close_dump_file (DFI_combine, NULL, NULL_RTX);
2277 timevar_pop (TV_DUMP);
2281 /* This is called from various places for FUNCTION_DECL, VAR_DECL,
2282 and TYPE_DECL nodes.
2284 This does nothing for local (non-static) variables, unless the
2285 variable is a register variable with an ASMSPEC. In that case, or
2286 if the variable is not an automatic, it sets up the RTL and
2287 outputs any assembler code (label definition, storage allocation
2288 and initialization).
2290 DECL is the declaration. If ASMSPEC is nonzero, it specifies
2291 the assembler symbol name to be used. TOP_LEVEL is nonzero
2292 if this declaration is not within a function. */
2294 void
2295 rest_of_decl_compilation (decl, asmspec, top_level, at_end)
2296 tree decl;
2297 const char *asmspec;
2298 int top_level;
2299 int at_end;
2301 /* We deferred calling assemble_alias so that we could collect
2302 other attributes such as visibility. Emit the alias now. */
2304 tree alias;
2305 alias = lookup_attribute ("alias", DECL_ATTRIBUTES (decl));
2306 if (alias)
2308 alias = TREE_VALUE (TREE_VALUE (alias));
2309 alias = get_identifier (TREE_STRING_POINTER (alias));
2310 assemble_alias (decl, alias);
2314 /* Forward declarations for nested functions are not "external",
2315 but we need to treat them as if they were. */
2316 if (TREE_STATIC (decl) || DECL_EXTERNAL (decl)
2317 || TREE_CODE (decl) == FUNCTION_DECL)
2319 timevar_push (TV_VARCONST);
2321 if (asmspec)
2322 make_decl_rtl (decl, asmspec);
2324 /* Don't output anything when a tentative file-scope definition
2325 is seen. But at end of compilation, do output code for them. */
2326 if (at_end || !DECL_DEFER_OUTPUT (decl))
2327 assemble_variable (decl, top_level, at_end, 0);
2329 #ifdef ASM_FINISH_DECLARE_OBJECT
2330 if (decl == last_assemble_variable_decl)
2332 ASM_FINISH_DECLARE_OBJECT (asm_out_file, decl,
2333 top_level, at_end);
2335 #endif
2337 timevar_pop (TV_VARCONST);
2339 else if (DECL_REGISTER (decl) && asmspec != 0)
2341 if (decode_reg_name (asmspec) >= 0)
2343 SET_DECL_RTL (decl, NULL_RTX);
2344 make_decl_rtl (decl, asmspec);
2346 else
2348 error ("invalid register name `%s' for register variable", asmspec);
2349 DECL_REGISTER (decl) = 0;
2350 if (!top_level)
2351 expand_decl (decl);
2354 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2355 else if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2356 && TREE_CODE (decl) == TYPE_DECL)
2358 timevar_push (TV_SYMOUT);
2359 dbxout_symbol (decl, 0);
2360 timevar_pop (TV_SYMOUT);
2362 #endif
2363 #ifdef SDB_DEBUGGING_INFO
2364 else if (write_symbols == SDB_DEBUG && top_level
2365 && TREE_CODE (decl) == TYPE_DECL)
2367 timevar_push (TV_SYMOUT);
2368 sdbout_symbol (decl, 0);
2369 timevar_pop (TV_SYMOUT);
2371 #endif
2372 #ifdef DWARF2_DEBUGGING_INFO
2373 else if ((write_symbols == DWARF2_DEBUG
2374 || write_symbols == VMS_AND_DWARF2_DEBUG)
2375 && top_level
2376 && TREE_CODE (decl) == TYPE_DECL)
2378 timevar_push (TV_SYMOUT);
2379 dwarf2out_decl (decl);
2380 timevar_pop (TV_SYMOUT);
2382 #endif
2385 /* Called after finishing a record, union or enumeral type. */
2387 void
2388 rest_of_type_compilation (type, toplev)
2389 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) \
2390 || defined (SDB_DEBUGGING_INFO) || defined (DWARF2_DEBUGGING_INFO)
2391 tree type;
2392 int toplev;
2393 #else
2394 tree type ATTRIBUTE_UNUSED;
2395 int toplev ATTRIBUTE_UNUSED;
2396 #endif
2398 /* Avoid confusing the debug information machinery when there are
2399 errors. */
2400 if (errorcount != 0 || sorrycount != 0)
2401 return;
2403 timevar_push (TV_SYMOUT);
2404 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
2405 if (write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
2406 dbxout_symbol (TYPE_STUB_DECL (type), !toplev);
2407 #endif
2408 #ifdef SDB_DEBUGGING_INFO
2409 if (write_symbols == SDB_DEBUG)
2410 sdbout_symbol (TYPE_STUB_DECL (type), !toplev);
2411 #endif
2412 #ifdef DWARF2_DEBUGGING_INFO
2413 if ((write_symbols == DWARF2_DEBUG
2414 || write_symbols == VMS_AND_DWARF2_DEBUG)
2415 && toplev)
2416 dwarf2out_decl (TYPE_STUB_DECL (type));
2417 #endif
2418 timevar_pop (TV_SYMOUT);
2421 /* This is called from finish_function (within langhooks.parse_file)
2422 after each top-level definition is parsed.
2423 It is supposed to compile that function or variable
2424 and output the assembler code for it.
2425 After we return, the tree storage is freed. */
2427 void
2428 rest_of_compilation (decl)
2429 tree decl;
2431 rtx insns;
2432 int tem;
2433 int failure = 0;
2434 int rebuild_label_notes_after_reload;
2436 timevar_push (TV_REST_OF_COMPILATION);
2438 /* Now that we're out of the frontend, we shouldn't have any more
2439 CONCATs anywhere. */
2440 generating_concat_p = 0;
2442 /* When processing delayed functions, prepare_function_start() won't
2443 have been run to re-initialize it. */
2444 cse_not_expected = ! optimize;
2446 /* First, make sure that NOTE_BLOCK is set correctly for each
2447 NOTE_INSN_BLOCK_BEG/NOTE_INSN_BLOCK_END note. */
2448 if (!cfun->x_whole_function_mode_p)
2449 identify_blocks ();
2451 /* In function-at-a-time mode, we do not attempt to keep the BLOCK
2452 tree in sensible shape. So, we just recalculate it here. */
2453 if (cfun->x_whole_function_mode_p)
2454 reorder_blocks ();
2456 init_flow ();
2458 /* If we are reconsidering an inline function
2459 at the end of compilation, skip the stuff for making it inline. */
2461 if (DECL_SAVED_INSNS (decl) == 0)
2463 int inlinable = 0;
2464 tree parent;
2465 const char *lose;
2467 /* If this is nested inside an inlined external function, pretend
2468 it was only declared. Since we cannot inline such functions,
2469 generating code for this one is not only not necessary but will
2470 confuse some debugging output writers. */
2471 for (parent = DECL_CONTEXT (current_function_decl);
2472 parent != NULL_TREE;
2473 parent = get_containing_scope (parent))
2474 if (TREE_CODE (parent) == FUNCTION_DECL
2475 && DECL_INLINE (parent) && DECL_EXTERNAL (parent))
2477 DECL_INITIAL (decl) = 0;
2478 goto exit_rest_of_compilation;
2480 else if (TYPE_P (parent))
2481 /* A function in a local class should be treated normally. */
2482 break;
2484 /* If requested, consider whether to make this function inline. */
2485 if ((DECL_INLINE (decl) && !flag_no_inline)
2486 || flag_inline_functions)
2488 timevar_push (TV_INTEGRATION);
2489 lose = function_cannot_inline_p (decl);
2490 timevar_pop (TV_INTEGRATION);
2491 if (lose || ! optimize)
2493 if (warn_inline && DECL_INLINE (decl))
2494 warning_with_decl (decl, lose);
2495 DECL_ABSTRACT_ORIGIN (decl) = 0;
2496 /* Don't really compile an extern inline function.
2497 If we can't make it inline, pretend
2498 it was only declared. */
2499 if (DECL_EXTERNAL (decl))
2501 DECL_INITIAL (decl) = 0;
2502 goto exit_rest_of_compilation;
2505 else {
2506 /* ??? Note that we used to just make it look like if
2507 the "inline" keyword was specified when we decide
2508 to inline it (because of -finline-functions).
2509 garloff@suse.de, 2002-04-24: Add another flag to
2510 actually record this piece of information. */
2511 if (!DECL_INLINE (decl))
2512 DID_INLINE_FUNC (decl) = 1;
2513 inlinable = DECL_INLINE (decl) = 1;
2517 insns = get_insns ();
2519 /* Dump the rtl code if we are dumping rtl. */
2521 if (open_dump_file (DFI_rtl, decl))
2523 if (DECL_SAVED_INSNS (decl))
2524 fprintf (rtl_dump_file, ";; (integrable)\n\n");
2525 close_dump_file (DFI_rtl, print_rtl, insns);
2528 /* Convert from NOTE_INSN_EH_REGION style notes, and do other
2529 sorts of eh initialization. Delay this until after the
2530 initial rtl dump so that we can see the original nesting. */
2531 convert_from_eh_region_ranges ();
2533 /* If function is inline, and we don't yet know whether to
2534 compile it by itself, defer decision till end of compilation.
2535 wrapup_global_declarations will (indirectly) call
2536 rest_of_compilation again for those functions that need to
2537 be output. Also defer those functions that we are supposed
2538 to defer. */
2540 if (inlinable
2541 || (DECL_INLINE (decl)
2542 && flag_inline_functions
2543 && ((! TREE_PUBLIC (decl) && ! TREE_ADDRESSABLE (decl)
2544 && ! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
2545 && ! flag_keep_inline_functions)
2546 || DECL_EXTERNAL (decl))))
2547 DECL_DEFER_OUTPUT (decl) = 1;
2549 if (DECL_INLINE (decl))
2550 /* DWARF wants separate debugging info for abstract and
2551 concrete instances of all inline functions, including those
2552 declared inline but not inlined, and those inlined even
2553 though they weren't declared inline. Conveniently, that's
2554 what DECL_INLINE means at this point. */
2555 (*debug_hooks->deferred_inline_function) (decl);
2557 if (DECL_DEFER_OUTPUT (decl))
2559 /* If -Wreturn-type, we have to do a bit of compilation. We just
2560 want to call cleanup the cfg to figure out whether or not we can
2561 fall off the end of the function; we do the minimum amount of
2562 work necessary to make that safe. */
2563 if (warn_return_type)
2565 int saved_optimize = optimize;
2567 optimize = 0;
2568 rebuild_jump_labels (insns);
2569 find_exception_handler_labels ();
2570 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2571 cleanup_cfg (CLEANUP_PRE_SIBCALL | CLEANUP_PRE_LOOP);
2572 optimize = saved_optimize;
2574 /* CFG is no longer maintained up-to-date. */
2575 free_bb_for_insn ();
2578 set_nothrow_function_flags ();
2579 if (current_function_nothrow)
2580 /* Now we know that this can't throw; set the flag for the benefit
2581 of other functions later in this translation unit. */
2582 TREE_NOTHROW (current_function_decl) = 1;
2584 timevar_push (TV_INTEGRATION);
2585 save_for_inline (decl);
2586 timevar_pop (TV_INTEGRATION);
2587 DECL_SAVED_INSNS (decl)->inlinable = inlinable;
2588 goto exit_rest_of_compilation;
2591 /* If specified extern inline but we aren't inlining it, we are
2592 done. This goes for anything that gets here with DECL_EXTERNAL
2593 set, not just things with DECL_INLINE. */
2594 if (DECL_EXTERNAL (decl))
2595 goto exit_rest_of_compilation;
2598 /* If we're emitting a nested function, make sure its parent gets
2599 emitted as well. Doing otherwise confuses debug info. */
2601 tree parent;
2602 for (parent = DECL_CONTEXT (current_function_decl);
2603 parent != NULL_TREE;
2604 parent = get_containing_scope (parent))
2605 if (TREE_CODE (parent) == FUNCTION_DECL)
2606 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (parent)) = 1;
2609 /* We are now committed to emitting code for this function. Do any
2610 preparation, such as emitting abstract debug info for the inline
2611 before it gets mangled by optimization. */
2612 if (DECL_INLINE (decl))
2613 (*debug_hooks->outlining_inline_function) (decl);
2615 /* Remove any notes we don't need. That will make iterating
2616 over the instruction sequence faster, and allow the garbage
2617 collector to reclaim the memory used by the notes. */
2618 remove_unnecessary_notes ();
2619 reorder_blocks ();
2621 ggc_collect ();
2623 /* Initialize some variables used by the optimizers. */
2624 init_function_for_compilation ();
2626 if (! DECL_DEFER_OUTPUT (decl))
2627 TREE_ASM_WRITTEN (decl) = 1;
2629 /* Now that integrate will no longer see our rtl, we need not
2630 distinguish between the return value of this function and the
2631 return value of called functions. Also, we can remove all SETs
2632 of subregs of hard registers; they are only here because of
2633 integrate. Also, we can now initialize pseudos intended to
2634 carry magic hard reg data throughout the function. */
2635 rtx_equal_function_value_matters = 0;
2636 purge_hard_subreg_sets (get_insns ());
2638 /* Early return if there were errors. We can run afoul of our
2639 consistency checks, and there's not really much point in fixing them.
2640 Don't return yet if -Wreturn-type; we need to do cleanup_cfg. */
2641 if (((rtl_dump_and_exit || flag_syntax_only) && !warn_return_type)
2642 || errorcount || sorrycount)
2643 goto exit_rest_of_compilation;
2645 timevar_push (TV_JUMP);
2646 open_dump_file (DFI_sibling, decl);
2647 insns = get_insns ();
2648 rebuild_jump_labels (insns);
2649 find_exception_handler_labels ();
2650 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2652 delete_unreachable_blocks ();
2654 /* We have to issue these warnings now already, because CFG cleanups
2655 further down may destroy the required information. */
2656 check_function_return_warnings ();
2658 /* Turn NOTE_INSN_PREDICTIONs into branch predictions. */
2659 if (flag_guess_branch_prob)
2661 timevar_push (TV_BRANCH_PROB);
2662 note_prediction_to_br_prob ();
2663 timevar_pop (TV_BRANCH_PROB);
2666 /* We may have potential sibling or tail recursion sites. Select one
2667 (of possibly multiple) methods of performing the call. */
2668 if (flag_optimize_sibling_calls)
2670 rtx insn;
2671 optimize_sibling_and_tail_recursive_calls ();
2673 /* Recompute the CFG as sibling optimization clobbers it randomly. */
2674 free_bb_for_insn ();
2675 find_exception_handler_labels ();
2676 rebuild_jump_labels (insns);
2677 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2679 /* There is pass ordering problem - we must lower NOTE_INSN_PREDICTION
2680 notes before simplifying cfg and we must do lowering after sibcall
2681 that unhides parts of RTL chain and cleans up the CFG.
2683 Until sibcall is replaced by tree-level optimizer, lets just
2684 sweep away the NOTE_INSN_PREDICTION notes that leaked out. */
2685 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
2686 if (GET_CODE (insn) == NOTE
2687 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_PREDICTION)
2688 delete_insn (insn);
2690 close_dump_file (DFI_sibling, print_rtl, get_insns ());
2691 timevar_pop (TV_JUMP);
2693 scope_to_insns_initialize ();
2694 /* Complete generation of exception handling code. */
2695 if (doing_eh (0))
2697 timevar_push (TV_JUMP);
2698 open_dump_file (DFI_eh, decl);
2700 finish_eh_generation ();
2702 close_dump_file (DFI_eh, print_rtl, get_insns ());
2703 timevar_pop (TV_JUMP);
2706 /* Delay emitting hard_reg_initial_value sets until after EH landing pad
2707 generation, which might create new sets. */
2708 emit_initial_value_sets ();
2710 #ifdef FINALIZE_PIC
2711 /* If we are doing position-independent code generation, now
2712 is the time to output special prologues and epilogues.
2713 We do not want to do this earlier, because it just clutters
2714 up inline functions with meaningless insns. */
2715 if (flag_pic)
2716 FINALIZE_PIC;
2717 #endif
2719 insns = get_insns ();
2721 /* Copy any shared structure that should not be shared. */
2722 unshare_all_rtl (current_function_decl, insns);
2724 #ifdef SETJMP_VIA_SAVE_AREA
2725 /* This must be performed before virtual register instantiation.
2726 Please be aware the everything in the compiler that can look
2727 at the RTL up to this point must understand that REG_SAVE_AREA
2728 is just like a use of the REG contained inside. */
2729 if (current_function_calls_alloca)
2730 optimize_save_area_alloca (insns);
2731 #endif
2733 /* Instantiate all virtual registers. */
2734 instantiate_virtual_regs (current_function_decl, insns);
2736 open_dump_file (DFI_jump, decl);
2738 /* Always do one jump optimization pass to ensure that JUMP_LABEL fields
2739 are initialized and to compute whether control can drop off the end
2740 of the function. */
2742 timevar_push (TV_JUMP);
2743 /* Turn NOTE_INSN_EXPECTED_VALUE into REG_BR_PROB. Do this
2744 before jump optimization switches branch directions. */
2745 if (flag_guess_branch_prob)
2746 expected_value_to_br_prob ();
2748 reg_scan (insns, max_reg_num (), 0);
2749 rebuild_jump_labels (insns);
2750 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2751 delete_trivially_dead_insns (insns, max_reg_num ());
2752 if (rtl_dump_file)
2753 dump_flow_info (rtl_dump_file);
2754 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_PRE_LOOP
2755 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
2757 if (optimize)
2759 free_bb_for_insn ();
2760 copy_loop_headers (insns);
2761 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
2763 purge_line_number_notes (insns);
2765 timevar_pop (TV_JUMP);
2766 close_dump_file (DFI_jump, print_rtl, insns);
2768 /* Now is when we stop if -fsyntax-only and -Wreturn-type. */
2769 if (rtl_dump_and_exit || flag_syntax_only || DECL_DEFER_OUTPUT (decl))
2771 goto exit_rest_of_compilation;
2774 /* Long term, this should probably move before the jump optimizer too,
2775 but I didn't want to disturb the rtl_dump_and_exit and related
2776 stuff at this time. */
2777 if (optimize > 0 && flag_ssa)
2779 /* Convert to SSA form. */
2781 timevar_push (TV_TO_SSA);
2782 open_dump_file (DFI_ssa, decl);
2784 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2785 convert_to_ssa ();
2787 close_dump_file (DFI_ssa, print_rtl_with_bb, insns);
2788 timevar_pop (TV_TO_SSA);
2790 /* Perform sparse conditional constant propagation, if requested. */
2791 if (flag_ssa_ccp)
2793 timevar_push (TV_SSA_CCP);
2794 open_dump_file (DFI_ssa_ccp, decl);
2796 ssa_const_prop ();
2798 close_dump_file (DFI_ssa_ccp, print_rtl_with_bb, get_insns ());
2799 timevar_pop (TV_SSA_CCP);
2802 /* It would be useful to cleanup the CFG at this point, but block
2803 merging and possibly other transformations might leave a PHI
2804 node in the middle of a basic block, which is a strict no-no. */
2806 /* The SSA implementation uses basic block numbers in its phi
2807 nodes. Thus, changing the control-flow graph or the basic
2808 blocks, e.g., calling find_basic_blocks () or cleanup_cfg (),
2809 may cause problems. */
2811 if (flag_ssa_dce)
2813 /* Remove dead code. */
2815 timevar_push (TV_SSA_DCE);
2816 open_dump_file (DFI_ssa_dce, decl);
2818 insns = get_insns ();
2819 ssa_eliminate_dead_code ();
2821 close_dump_file (DFI_ssa_dce, print_rtl_with_bb, insns);
2822 timevar_pop (TV_SSA_DCE);
2825 /* Convert from SSA form. */
2827 timevar_push (TV_FROM_SSA);
2828 open_dump_file (DFI_ussa, decl);
2830 convert_from_ssa ();
2831 /* New registers have been created. Rescan their usage. */
2832 reg_scan (insns, max_reg_num (), 1);
2834 close_dump_file (DFI_ussa, print_rtl_with_bb, insns);
2835 timevar_pop (TV_FROM_SSA);
2837 ggc_collect ();
2840 timevar_push (TV_JUMP);
2841 if (optimize)
2842 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2844 /* Try to identify useless null pointer tests and delete them. */
2845 if (flag_delete_null_pointer_checks)
2847 open_dump_file (DFI_null, decl);
2848 if (rtl_dump_file)
2849 dump_flow_info (rtl_dump_file);
2851 if (delete_null_pointer_checks (insns))
2852 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2854 close_dump_file (DFI_null, print_rtl_with_bb, insns);
2857 /* Jump optimization, and the removal of NULL pointer checks, may
2858 have reduced the number of instructions substantially. CSE, and
2859 future passes, allocate arrays whose dimensions involve the
2860 maximum instruction UID, so if we can reduce the maximum UID
2861 we'll save big on memory. */
2862 renumber_insns (rtl_dump_file);
2863 timevar_pop (TV_JUMP);
2865 close_dump_file (DFI_jump, print_rtl_with_bb, insns);
2867 ggc_collect ();
2869 /* Perform common subexpression elimination.
2870 Nonzero value from `cse_main' means that jumps were simplified
2871 and some code may now be unreachable, so do
2872 jump optimization again. */
2874 if (optimize > 0)
2876 open_dump_file (DFI_cse, decl);
2877 if (rtl_dump_file)
2878 dump_flow_info (rtl_dump_file);
2879 timevar_push (TV_CSE);
2881 reg_scan (insns, max_reg_num (), 1);
2883 tem = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2884 if (tem)
2885 rebuild_jump_labels (insns);
2886 purge_all_dead_edges (0);
2888 delete_trivially_dead_insns (insns, max_reg_num ());
2890 /* If we are not running more CSE passes, then we are no longer
2891 expecting CSE to be run. But always rerun it in a cheap mode. */
2892 cse_not_expected = !flag_rerun_cse_after_loop && !flag_gcse;
2894 if (tem || optimize > 1)
2895 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2896 /* Try to identify useless null pointer tests and delete them. */
2897 if (flag_delete_null_pointer_checks)
2899 timevar_push (TV_JUMP);
2901 if (delete_null_pointer_checks (insns))
2902 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2903 timevar_pop (TV_JUMP);
2906 /* The second pass of jump optimization is likely to have
2907 removed a bunch more instructions. */
2908 renumber_insns (rtl_dump_file);
2910 timevar_pop (TV_CSE);
2911 close_dump_file (DFI_cse, print_rtl_with_bb, insns);
2914 open_dump_file (DFI_addressof, decl);
2916 purge_addressof (insns);
2917 if (optimize)
2918 purge_all_dead_edges (0);
2919 reg_scan (insns, max_reg_num (), 1);
2921 close_dump_file (DFI_addressof, print_rtl, insns);
2923 ggc_collect ();
2925 /* Perform global cse. */
2927 if (optimize > 0 && flag_gcse)
2929 int save_csb, save_cfj;
2930 int tem2 = 0;
2932 timevar_push (TV_GCSE);
2933 open_dump_file (DFI_gcse, decl);
2935 tem = gcse_main (insns, rtl_dump_file);
2936 rebuild_jump_labels (insns);
2937 delete_trivially_dead_insns (insns, max_reg_num ());
2939 save_csb = flag_cse_skip_blocks;
2940 save_cfj = flag_cse_follow_jumps;
2941 flag_cse_skip_blocks = flag_cse_follow_jumps = 0;
2943 /* Instantiate any remaining CONSTANT_P_RTX nodes. */
2944 if (current_function_calls_constant_p)
2945 purge_builtin_constant_p ();
2947 /* If -fexpensive-optimizations, re-run CSE to clean up things done
2948 by gcse. */
2949 if (flag_expensive_optimizations)
2951 timevar_push (TV_CSE);
2952 reg_scan (insns, max_reg_num (), 1);
2953 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2954 purge_all_dead_edges (0);
2955 delete_trivially_dead_insns (insns, max_reg_num ());
2956 timevar_pop (TV_CSE);
2957 cse_not_expected = !flag_rerun_cse_after_loop;
2960 /* If gcse or cse altered any jumps, rerun jump optimizations to clean
2961 things up. Then possibly re-run CSE again. */
2962 while (tem || tem2)
2964 tem = tem2 = 0;
2965 timevar_push (TV_JUMP);
2966 rebuild_jump_labels (insns);
2967 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
2968 timevar_pop (TV_JUMP);
2970 if (flag_expensive_optimizations)
2972 timevar_push (TV_CSE);
2973 reg_scan (insns, max_reg_num (), 1);
2974 tem2 = cse_main (insns, max_reg_num (), 0, rtl_dump_file);
2975 purge_all_dead_edges (0);
2976 delete_trivially_dead_insns (insns, max_reg_num ());
2977 timevar_pop (TV_CSE);
2981 close_dump_file (DFI_gcse, print_rtl_with_bb, insns);
2982 timevar_pop (TV_GCSE);
2984 ggc_collect ();
2985 flag_cse_skip_blocks = save_csb;
2986 flag_cse_follow_jumps = save_cfj;
2987 #ifdef ENABLE_CHECKING
2988 verify_flow_info ();
2989 #endif
2992 /* Move constant computations out of loops. */
2994 if (optimize > 0 && flag_loop_optimize)
2996 int do_unroll, do_prefetch;
2998 timevar_push (TV_LOOP);
2999 delete_dead_jumptables ();
3000 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_PRE_LOOP);
3001 open_dump_file (DFI_loop, decl);
3002 /* CFG is no longer maintained up-to-date. */
3003 free_bb_for_insn ();
3005 if (flag_unroll_loops)
3006 do_unroll = 0; /* Having two unrollers is useless. */
3007 else
3008 do_unroll = flag_old_unroll_loops ? LOOP_UNROLL : LOOP_AUTO_UNROLL;
3009 do_prefetch = flag_prefetch_loop_arrays ? LOOP_PREFETCH : 0;
3010 if (flag_rerun_loop_opt)
3012 cleanup_barriers ();
3014 /* We only want to perform unrolling once. */
3015 loop_optimize (insns, rtl_dump_file, do_unroll);
3016 do_unroll = 0;
3018 /* The first call to loop_optimize makes some instructions
3019 trivially dead. We delete those instructions now in the
3020 hope that doing so will make the heuristics in loop work
3021 better and possibly speed up compilation. */
3022 delete_trivially_dead_insns (insns, max_reg_num ());
3024 /* The regscan pass is currently necessary as the alias
3025 analysis code depends on this information. */
3026 reg_scan (insns, max_reg_num (), 1);
3028 cleanup_barriers ();
3029 loop_optimize (insns, rtl_dump_file, do_unroll | LOOP_BCT | do_prefetch);
3031 /* Loop can create trivially dead instructions. */
3032 delete_trivially_dead_insns (insns, max_reg_num ());
3033 close_dump_file (DFI_loop, print_rtl, insns);
3034 timevar_pop (TV_LOOP);
3035 find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
3037 ggc_collect ();
3040 /* Perform jump bypassing and control flow optimizations. */
3041 if (optimize > 0 && flag_gcse)
3043 timevar_push (TV_BYPASS);
3044 open_dump_file (DFI_bypass, decl);
3046 cleanup_cfg (CLEANUP_EXPENSIVE);
3047 tem = bypass_jumps (rtl_dump_file);
3049 if (tem)
3051 rebuild_jump_labels (insns);
3052 cleanup_cfg (CLEANUP_EXPENSIVE);
3053 delete_trivially_dead_insns (insns, max_reg_num ());
3056 close_dump_file (DFI_bypass, print_rtl_with_bb, insns);
3057 timevar_pop (TV_BYPASS);
3059 ggc_collect ();
3061 #ifdef ENABLE_CHECKING
3062 verify_flow_info ();
3063 #endif
3066 /* Do control and data flow analysis; wrote some of the results to
3067 the dump file. */
3069 timevar_push (TV_FLOW);
3070 open_dump_file (DFI_cfg, decl);
3071 if (rtl_dump_file)
3072 dump_flow_info (rtl_dump_file);
3073 if (optimize)
3074 cleanup_cfg (CLEANUP_EXPENSIVE
3075 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3077 /* It may make more sense to mark constant functions after dead code is
3078 eliminated by life_analysis, but we need to do it early, as -fprofile-arcs
3079 may insert code making function non-constant, but we still must consider
3080 it as constant, otherwise -fbranch-probabilities will not read data back.
3082 life_analysis rarely eliminates modification of external memory.
3084 if (optimize)
3085 mark_constant_function ();
3087 close_dump_file (DFI_cfg, print_rtl_with_bb, insns);
3089 /* Do branch profiling and static profile estimation passes. */
3090 if (optimize > 0 || cfun->arc_profile || flag_branch_probabilities)
3092 struct loops loops;
3094 timevar_push (TV_BRANCH_PROB);
3095 open_dump_file (DFI_bp, decl);
3096 if (cfun->arc_profile || flag_branch_probabilities)
3097 branch_prob ();
3099 /* Discover and record the loop depth at the head of each basic
3100 block. The loop infrastructure does the real job for us. */
3101 flow_loops_find (&loops, LOOP_TREE);
3103 if (rtl_dump_file)
3104 flow_loops_dump (&loops, rtl_dump_file, NULL, 0);
3106 /* Estimate using heuristics if no profiling info is available. */
3107 if (flag_guess_branch_prob)
3108 estimate_probability (&loops);
3110 flow_loops_free (&loops);
3111 close_dump_file (DFI_bp, print_rtl_with_bb, insns);
3112 timevar_pop (TV_BRANCH_PROB);
3114 if (optimize > 0)
3116 open_dump_file (DFI_ce1, decl);
3117 if (flag_if_conversion)
3119 timevar_push (TV_IFCVT);
3120 if (rtl_dump_file)
3121 dump_flow_info (rtl_dump_file);
3122 cleanup_cfg (CLEANUP_EXPENSIVE);
3123 reg_scan (insns, max_reg_num (), 0);
3124 if_convert (0);
3125 timevar_pop (TV_IFCVT);
3127 timevar_push (TV_JUMP);
3128 cleanup_cfg (CLEANUP_EXPENSIVE);
3129 reg_scan (insns, max_reg_num (), 0);
3130 timevar_pop (TV_JUMP);
3131 close_dump_file (DFI_ce1, print_rtl_with_bb, get_insns ());
3133 if (flag_tracer)
3135 timevar_push (TV_TRACER);
3136 open_dump_file (DFI_tracer, decl);
3137 if (rtl_dump_file)
3138 dump_flow_info (rtl_dump_file);
3139 tracer ();
3140 cleanup_cfg (CLEANUP_EXPENSIVE);
3141 reg_scan (insns, max_reg_num (), 0);
3142 close_dump_file (DFI_tracer, print_rtl_with_bb, get_insns ());
3143 timevar_pop (TV_TRACER);
3146 /* Perform loop optimalizations. It might be better to do them a bit
3147 sooner, but we want the profile feedback to work more efficiently. */
3148 if (optimize > 0
3149 && (flag_unswitch_loops
3150 || flag_peel_loops
3151 || flag_unroll_loops))
3153 struct loops *loops;
3154 timevar_push (TV_LOOP);
3155 open_dump_file (DFI_loop2, decl);
3156 if (rtl_dump_file)
3157 dump_flow_info (rtl_dump_file);
3159 loops = loop_optimizer_init (rtl_dump_file);
3161 if (loops)
3163 /* The optimalizations: */
3164 if (flag_unswitch_loops)
3165 unswitch_loops (loops);
3167 if (flag_peel_loops || flag_unroll_loops)
3168 unroll_and_peel_loops (loops,
3169 (flag_peel_loops ? UAP_PEEL : 0) |
3170 (flag_unroll_loops ? UAP_UNROLL : 0) |
3171 (flag_unroll_all_loops ? UAP_UNROLL_ALL : 0));
3173 loop_optimizer_finalize (loops, rtl_dump_file);
3176 cleanup_cfg (CLEANUP_EXPENSIVE);
3177 delete_trivially_dead_insns (insns, max_reg_num ());
3178 reg_scan (insns, max_reg_num (), 0);
3179 if (rtl_dump_file)
3180 dump_flow_info (rtl_dump_file);
3181 close_dump_file (DFI_loop2, print_rtl_with_bb, get_insns ());
3182 timevar_pop (TV_LOOP);
3183 ggc_collect ();
3186 if (flag_rerun_cse_after_loop)
3188 timevar_push (TV_CSE2);
3189 open_dump_file (DFI_cse2, decl);
3190 if (rtl_dump_file)
3191 dump_flow_info (rtl_dump_file);
3192 /* CFG is no longer maintained up-to-date. */
3193 tem = cse_main (insns, max_reg_num (), 1, rtl_dump_file);
3194 purge_all_dead_edges (0);
3195 delete_trivially_dead_insns (insns, max_reg_num ());
3197 if (tem)
3199 timevar_push (TV_JUMP);
3200 rebuild_jump_labels (insns);
3201 cleanup_cfg (CLEANUP_EXPENSIVE);
3202 timevar_pop (TV_JUMP);
3204 reg_scan (insns, max_reg_num (), 0);
3205 close_dump_file (DFI_cse2, print_rtl_with_bb, insns);
3206 ggc_collect ();
3207 timevar_pop (TV_CSE2);
3210 cse_not_expected = 1;
3212 open_dump_file (DFI_life, decl);
3213 regclass_init ();
3215 #ifdef ENABLE_CHECKING
3216 verify_flow_info ();
3217 #endif
3218 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3219 if (optimize)
3220 cleanup_cfg ((optimize ? CLEANUP_EXPENSIVE : 0) | CLEANUP_UPDATE_LIFE
3221 | (flag_thread_jumps ? CLEANUP_THREADING : 0));
3222 timevar_pop (TV_FLOW);
3224 if (warn_uninitialized)
3226 uninitialized_vars_warning (DECL_INITIAL (decl));
3227 if (extra_warnings)
3228 setjmp_args_warning ();
3231 if (optimize)
3233 if (!flag_new_regalloc && initialize_uninitialized_subregs ())
3235 /* Insns were inserted, and possibly pseudos created, so
3236 things might look a bit different. */
3237 insns = get_insns ();
3238 allocate_reg_life_data ();
3239 update_life_info (NULL, UPDATE_LIFE_GLOBAL_RM_NOTES,
3240 PROP_LOG_LINKS | PROP_REG_INFO | PROP_DEATH_NOTES);
3244 no_new_pseudos = 1;
3246 close_dump_file (DFI_life, print_rtl_with_bb, insns);
3248 ggc_collect ();
3250 /* If -opt, try combining insns through substitution. */
3252 if (optimize > 0)
3254 int rebuild_jump_labels_after_combine = 0;
3256 timevar_push (TV_COMBINE);
3257 open_dump_file (DFI_combine, decl);
3259 rebuild_jump_labels_after_combine
3260 = combine_instructions (insns, max_reg_num ());
3262 /* Combining insns may have turned an indirect jump into a
3263 direct jump. Rebuild the JUMP_LABEL fields of jumping
3264 instructions. */
3265 if (rebuild_jump_labels_after_combine)
3267 timevar_push (TV_JUMP);
3268 rebuild_jump_labels (insns);
3269 timevar_pop (TV_JUMP);
3271 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3274 close_dump_file (DFI_combine, print_rtl_with_bb, insns);
3275 timevar_pop (TV_COMBINE);
3277 ggc_collect ();
3280 /* Rerun if-conversion, as combine may have simplified things enough to
3281 now meet sequence length restrictions. */
3282 if (flag_if_conversion)
3284 timevar_push (TV_IFCVT);
3285 open_dump_file (DFI_ce2, decl);
3287 no_new_pseudos = 0;
3288 if_convert (1);
3289 no_new_pseudos = 1;
3291 close_dump_file (DFI_ce2, print_rtl_with_bb, insns);
3292 timevar_pop (TV_IFCVT);
3295 /* Register allocation pre-pass, to reduce number of moves
3296 necessary for two-address machines. */
3297 if (optimize > 0 && (flag_regmove || flag_expensive_optimizations))
3299 timevar_push (TV_REGMOVE);
3300 open_dump_file (DFI_regmove, decl);
3302 regmove_optimize (insns, max_reg_num (), rtl_dump_file);
3304 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3305 close_dump_file (DFI_regmove, print_rtl_with_bb, insns);
3306 timevar_pop (TV_REGMOVE);
3308 ggc_collect ();
3311 /* Do unconditional splitting before register allocation to allow machine
3312 description to add extra information not needed previously. */
3313 split_all_insns (1);
3315 #ifdef OPTIMIZE_MODE_SWITCHING
3316 timevar_push (TV_MODE_SWITCH);
3318 no_new_pseudos = 0;
3319 optimize_mode_switching (NULL);
3320 no_new_pseudos = 1;
3322 timevar_pop (TV_MODE_SWITCH);
3323 #endif
3325 /* Any of the several passes since flow1 will have munged register
3326 lifetime data a bit. We need it to be up to date for scheduling
3327 (see handling of reg_known_equiv in init_alias_analysis). */
3328 recompute_reg_usage (insns, !optimize_size);
3330 timevar_push (TV_SCHED);
3332 #ifdef INSN_SCHEDULING
3334 /* Print function header into sched dump now
3335 because doing the sched analysis makes some of the dump. */
3336 if (optimize > 0 && flag_schedule_insns)
3338 open_dump_file (DFI_sched, decl);
3340 /* Do control and data sched analysis,
3341 and write some of the results to dump file. */
3343 schedule_insns (rtl_dump_file);
3345 close_dump_file (DFI_sched, print_rtl_with_bb, insns);
3347 #endif
3348 timevar_pop (TV_SCHED);
3350 ggc_collect ();
3352 /* Determine if the current function is a leaf before running reload
3353 since this can impact optimizations done by the prologue and
3354 epilogue thus changing register elimination offsets. */
3355 current_function_is_leaf = leaf_function_p ();
3357 timevar_push (TV_LOCAL_ALLOC);
3358 open_dump_file (DFI_lreg, decl);
3360 /* Allocate pseudo-regs that are used only within 1 basic block.
3362 RUN_JUMP_AFTER_RELOAD records whether or not we need to rerun the
3363 jump optimizer after register allocation and reloading are finished. */
3365 if (flag_new_regalloc)
3367 delete_trivially_dead_insns (insns, max_reg_num ());
3368 reg_alloc ();
3370 timevar_pop (TV_LOCAL_ALLOC);
3371 if (dump_file[DFI_lreg].enabled)
3373 timevar_push (TV_DUMP);
3375 close_dump_file (DFI_lreg, NULL, NULL);
3376 timevar_pop (TV_DUMP);
3379 /* XXX clean up the whole mess to bring live info in shape again. */
3380 timevar_push (TV_GLOBAL_ALLOC);
3381 open_dump_file (DFI_greg, decl);
3383 build_insn_chain (insns);
3384 failure = reload (insns, 0);
3386 timevar_pop (TV_GLOBAL_ALLOC);
3388 if (dump_file[DFI_greg].enabled)
3390 timevar_push (TV_DUMP);
3392 dump_global_regs (rtl_dump_file);
3394 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3395 timevar_pop (TV_DUMP);
3398 if (failure)
3399 goto exit_rest_of_compilation;
3400 reload_completed = 1;
3401 rebuild_label_notes_after_reload = 0;
3403 else
3405 /* Allocate the reg_renumber array. */
3406 allocate_reg_info (max_regno, FALSE, TRUE);
3408 /* And the reg_equiv_memory_loc array. */
3409 reg_equiv_memory_loc = (rtx *) xcalloc (max_regno, sizeof (rtx));
3411 allocate_initial_values (reg_equiv_memory_loc);
3413 regclass (insns, max_reg_num (), rtl_dump_file);
3414 rebuild_label_notes_after_reload = local_alloc ();
3416 timevar_pop (TV_LOCAL_ALLOC);
3418 if (dump_file[DFI_lreg].enabled)
3420 timevar_push (TV_DUMP);
3422 dump_flow_info (rtl_dump_file);
3423 dump_local_alloc (rtl_dump_file);
3425 close_dump_file (DFI_lreg, print_rtl_with_bb, insns);
3426 timevar_pop (TV_DUMP);
3429 ggc_collect ();
3431 timevar_push (TV_GLOBAL_ALLOC);
3432 open_dump_file (DFI_greg, decl);
3434 /* If optimizing, allocate remaining pseudo-regs. Do the reload
3435 pass fixing up any insns that are invalid. */
3437 if (optimize)
3438 failure = global_alloc (rtl_dump_file);
3439 else
3441 build_insn_chain (insns);
3442 failure = reload (insns, 0);
3445 timevar_pop (TV_GLOBAL_ALLOC);
3447 if (dump_file[DFI_greg].enabled)
3449 timevar_push (TV_DUMP);
3451 dump_global_regs (rtl_dump_file);
3453 close_dump_file (DFI_greg, print_rtl_with_bb, insns);
3454 timevar_pop (TV_DUMP);
3457 if (failure)
3458 goto exit_rest_of_compilation;
3461 ggc_collect ();
3463 open_dump_file (DFI_postreload, decl);
3465 /* Do a very simple CSE pass over just the hard registers. */
3466 if (optimize > 0)
3468 timevar_push (TV_RELOAD_CSE_REGS);
3469 reload_cse_regs (insns);
3470 timevar_pop (TV_RELOAD_CSE_REGS);
3473 /* Register allocation and reloading may have turned an indirect jump into
3474 a direct jump. If so, we must rebuild the JUMP_LABEL fields of
3475 jumping instructions. */
3476 if (rebuild_label_notes_after_reload)
3478 timevar_push (TV_JUMP);
3480 rebuild_jump_labels (insns);
3481 purge_all_dead_edges (0);
3483 timevar_pop (TV_JUMP);
3486 close_dump_file (DFI_postreload, print_rtl_with_bb, insns);
3488 /* Re-create the death notes which were deleted during reload. */
3489 timevar_push (TV_FLOW2);
3490 open_dump_file (DFI_flow2, decl);
3492 #ifdef ENABLE_CHECKING
3493 verify_flow_info ();
3494 #endif
3496 /* If optimizing, then go ahead and split insns now. */
3497 #ifndef STACK_REGS
3498 if (optimize > 0)
3499 #endif
3500 split_all_insns (0);
3502 if (optimize)
3503 cleanup_cfg (CLEANUP_EXPENSIVE);
3505 /* On some machines, the prologue and epilogue code, or parts thereof,
3506 can be represented as RTL. Doing so lets us schedule insns between
3507 it and the rest of the code and also allows delayed branch
3508 scheduling to operate in the epilogue. */
3509 thread_prologue_and_epilogue_insns (insns);
3511 if (optimize)
3513 life_analysis (insns, rtl_dump_file, PROP_FINAL);
3514 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3515 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3517 /* This is kind of a heuristic. We need to run combine_stack_adjustments
3518 even for machines with possibly nonzero RETURN_POPS_ARGS
3519 and ACCUMULATE_OUTGOING_ARGS. We expect that only ports having
3520 push instructions will have popping returns. */
3521 #ifndef PUSH_ROUNDING
3522 if (!ACCUMULATE_OUTGOING_ARGS)
3523 #endif
3524 combine_stack_adjustments ();
3526 ggc_collect ();
3529 flow2_completed = 1;
3531 close_dump_file (DFI_flow2, print_rtl_with_bb, insns);
3532 timevar_pop (TV_FLOW2);
3534 #ifdef HAVE_peephole2
3535 if (optimize > 0 && flag_peephole2)
3537 timevar_push (TV_PEEPHOLE2);
3538 open_dump_file (DFI_peephole2, decl);
3540 peephole2_optimize (rtl_dump_file);
3542 close_dump_file (DFI_peephole2, print_rtl_with_bb, insns);
3543 timevar_pop (TV_PEEPHOLE2);
3545 #endif
3547 if (optimize > 0 && (flag_rename_registers || flag_cprop_registers))
3549 timevar_push (TV_RENAME_REGISTERS);
3550 open_dump_file (DFI_rnreg, decl);
3552 if (flag_rename_registers)
3553 regrename_optimize ();
3554 if (flag_cprop_registers)
3555 copyprop_hardreg_forward ();
3557 close_dump_file (DFI_rnreg, print_rtl_with_bb, insns);
3558 timevar_pop (TV_RENAME_REGISTERS);
3561 if (optimize > 0)
3563 timevar_push (TV_REORDER_BLOCKS);
3564 open_dump_file (DFI_bbro, decl);
3566 /* Last attempt to optimize CFG, as scheduling, peepholing and insn
3567 splitting possibly introduced more crossjumping opportunities. */
3568 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE
3569 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0));
3571 if (flag_sched2_use_traces && flag_schedule_insns_after_reload)
3572 tracer ();
3573 if (flag_reorder_blocks)
3574 reorder_basic_blocks ();
3575 if (flag_reorder_blocks
3576 || (flag_sched2_use_traces && flag_schedule_insns_after_reload))
3577 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_UPDATE_LIFE);
3579 close_dump_file (DFI_bbro, print_rtl_with_bb, insns);
3580 timevar_pop (TV_REORDER_BLOCKS);
3583 if (flag_if_conversion2)
3585 timevar_push (TV_IFCVT2);
3586 open_dump_file (DFI_ce3, decl);
3588 if_convert (1);
3590 close_dump_file (DFI_ce3, print_rtl_with_bb, insns);
3591 timevar_pop (TV_IFCVT2);
3594 #ifdef INSN_SCHEDULING
3595 if (optimize > 0 && flag_schedule_insns_after_reload)
3597 timevar_push (TV_SCHED2);
3598 open_dump_file (DFI_sched2, decl);
3600 /* Do control and data sched analysis again,
3601 and write some more of the results to dump file. */
3603 split_all_insns (1);
3605 if (flag_sched2_use_superblocks || flag_sched2_use_traces)
3607 schedule_ebbs (rtl_dump_file);
3608 /* No liveness updating code yet, but it should be easy to do.
3609 reg-stack recompute the liveness when needed for now. */
3610 count_or_remove_death_notes (NULL, 1);
3611 cleanup_cfg (CLEANUP_EXPENSIVE);
3613 else
3614 schedule_insns (rtl_dump_file);
3616 close_dump_file (DFI_sched2, print_rtl_with_bb, insns);
3617 timevar_pop (TV_SCHED2);
3619 ggc_collect ();
3621 #endif
3623 #ifdef LEAF_REGISTERS
3624 current_function_uses_only_leaf_regs
3625 = optimize > 0 && only_leaf_regs_used () && leaf_function_p ();
3626 #endif
3628 #ifdef STACK_REGS
3629 timevar_push (TV_REG_STACK);
3630 open_dump_file (DFI_stack, decl);
3632 if (reg_to_stack (insns, rtl_dump_file) && optimize)
3634 if (cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK
3635 | (flag_crossjumping ? CLEANUP_CROSSJUMP : 0))
3636 && flag_reorder_blocks)
3638 reorder_basic_blocks ();
3639 cleanup_cfg (CLEANUP_EXPENSIVE | CLEANUP_POST_REGSTACK);
3643 close_dump_file (DFI_stack, print_rtl_with_bb, insns);
3644 timevar_pop (TV_REG_STACK);
3646 ggc_collect ();
3647 #endif
3648 compute_alignments ();
3650 /* CFG is no longer maintained up-to-date. */
3651 free_bb_for_insn ();
3653 /* If a machine dependent reorganization is needed, call it. */
3654 #ifdef MACHINE_DEPENDENT_REORG
3655 timevar_push (TV_MACH_DEP);
3656 open_dump_file (DFI_mach, decl);
3658 MACHINE_DEPENDENT_REORG (insns);
3660 close_dump_file (DFI_mach, print_rtl, insns);
3661 timevar_pop (TV_MACH_DEP);
3663 ggc_collect ();
3664 #endif
3666 purge_line_number_notes (insns);
3667 cleanup_barriers ();
3669 /* If a scheduling pass for delayed branches is to be done,
3670 call the scheduling code. */
3672 #ifdef DELAY_SLOTS
3673 if (optimize > 0 && flag_delayed_branch)
3675 timevar_push (TV_DBR_SCHED);
3676 open_dump_file (DFI_dbr, decl);
3678 dbr_schedule (insns, rtl_dump_file);
3680 close_dump_file (DFI_dbr, print_rtl, insns);
3681 timevar_pop (TV_DBR_SCHED);
3683 ggc_collect ();
3685 #endif
3687 #if defined (HAVE_ATTR_length) && !defined (STACK_REGS)
3688 timevar_push (TV_SHORTEN_BRANCH);
3689 split_all_insns_noflow ();
3690 timevar_pop (TV_SHORTEN_BRANCH);
3691 #endif
3693 convert_to_eh_region_ranges ();
3695 /* Shorten branches. */
3696 timevar_push (TV_SHORTEN_BRANCH);
3697 shorten_branches (get_insns ());
3698 timevar_pop (TV_SHORTEN_BRANCH);
3700 set_nothrow_function_flags ();
3701 if (current_function_nothrow)
3702 /* Now we know that this can't throw; set the flag for the benefit
3703 of other functions later in this translation unit. */
3704 TREE_NOTHROW (current_function_decl) = 1;
3706 /* Now turn the rtl into assembler code. */
3708 timevar_push (TV_FINAL);
3710 rtx x;
3711 const char *fnname;
3713 /* Get the function's name, as described by its RTL. This may be
3714 different from the DECL_NAME name used in the source file. */
3716 x = DECL_RTL (decl);
3717 if (GET_CODE (x) != MEM)
3718 abort ();
3719 x = XEXP (x, 0);
3720 if (GET_CODE (x) != SYMBOL_REF)
3721 abort ();
3722 fnname = XSTR (x, 0);
3724 assemble_start_function (decl, fnname);
3725 final_start_function (insns, asm_out_file, optimize);
3726 final (insns, asm_out_file, optimize, 0);
3727 final_end_function ();
3729 #ifdef IA64_UNWIND_INFO
3730 /* ??? The IA-64 ".handlerdata" directive must be issued before
3731 the ".endp" directive that closes the procedure descriptor. */
3732 output_function_exception_table ();
3733 #endif
3735 assemble_end_function (decl, fnname);
3737 #ifndef IA64_UNWIND_INFO
3738 /* Otherwise, it feels unclean to switch sections in the middle. */
3739 output_function_exception_table ();
3740 #endif
3742 if (! quiet_flag)
3743 fflush (asm_out_file);
3745 /* Release all memory allocated by flow. */
3746 free_basic_block_vars (0);
3748 /* Release all memory held by regsets now. */
3749 regset_release_memory ();
3751 timevar_pop (TV_FINAL);
3753 ggc_collect ();
3755 /* Write DBX symbols if requested. */
3757 /* Note that for those inline functions where we don't initially
3758 know for certain that we will be generating an out-of-line copy,
3759 the first invocation of this routine (rest_of_compilation) will
3760 skip over this code by doing a `goto exit_rest_of_compilation;'.
3761 Later on, wrapup_global_declarations will (indirectly) call
3762 rest_of_compilation again for those inline functions that need
3763 to have out-of-line copies generated. During that call, we
3764 *will* be routed past here. */
3766 timevar_push (TV_SYMOUT);
3767 (*debug_hooks->function_decl) (decl);
3768 timevar_pop (TV_SYMOUT);
3770 exit_rest_of_compilation:
3772 coverage_end_function ();
3774 /* In case the function was not output,
3775 don't leave any temporary anonymous types
3776 queued up for sdb output. */
3777 #ifdef SDB_DEBUGGING_INFO
3778 if (write_symbols == SDB_DEBUG)
3779 sdbout_types (NULL_TREE);
3780 #endif
3782 reload_completed = 0;
3783 flow2_completed = 0;
3784 no_new_pseudos = 0;
3786 timevar_push (TV_FINAL);
3788 /* Clear out the insn_length contents now that they are no
3789 longer valid. */
3790 init_insn_lengths ();
3792 /* Show no temporary slots allocated. */
3793 init_temp_slots ();
3795 free_basic_block_vars (0);
3796 free_bb_for_insn ();
3798 timevar_pop (TV_FINAL);
3800 if ((*targetm.binds_local_p) (current_function_decl))
3802 int pref = cfun->preferred_stack_boundary;
3803 if (cfun->recursive_call_emit
3804 && cfun->stack_alignment_needed > cfun->preferred_stack_boundary)
3805 pref = cfun->stack_alignment_needed;
3806 cgraph_rtl_info (current_function_decl)->preferred_incoming_stack_boundary
3807 = pref;
3810 /* Make sure volatile mem refs aren't considered valid operands for
3811 arithmetic insns. We must call this here if this is a nested inline
3812 function, since the above code leaves us in the init_recog state
3813 (from final.c), and the function context push/pop code does not
3814 save/restore volatile_ok.
3816 ??? Maybe it isn't necessary for expand_start_function to call this
3817 anymore if we do it here? */
3819 init_recog_no_volatile ();
3821 /* We're done with this function. Free up memory if we can. */
3822 free_after_parsing (cfun);
3823 if (! DECL_DEFER_OUTPUT (decl))
3825 free_after_compilation (cfun);
3827 /* Clear integrate.c's pointer to the cfun structure we just
3828 destroyed. */
3829 DECL_SAVED_INSNS (decl) = 0;
3831 cfun = 0;
3833 ggc_collect ();
3835 timevar_pop (TV_REST_OF_COMPILATION);
3838 static void
3839 display_help ()
3841 int undoc;
3842 unsigned long i;
3843 const char *lang;
3845 printf (_(" -ffixed-<register> Mark <register> as being unavailable to the compiler\n"));
3846 printf (_(" -fcall-used-<register> Mark <register> as being corrupted by function calls\n"));
3847 printf (_(" -fcall-saved-<register> Mark <register> as being preserved across functions\n"));
3848 printf (_(" -finline-limit=<number> Limits the size of inlined functions to <number>\n"));
3849 printf (_(" -fmessage-length=<number> Limits diagnostics messages lengths to <number> characters per line. 0 suppresses line-wrapping\n"));
3850 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"));
3851 printf (_(" -ftls-model=[global-dynamic | local-dynamic | initial-exec | local-exec] Indicates the default thread-local storage code generation model\n"));
3852 printf (_(" -fstack-limit-register=<register> Trap if the stack goes past <register>\n"));
3853 printf (_(" -fstack-limit-symbol=<name> Trap if the stack goes past symbol <name>\n"));
3854 printf (_(" -frandom-seed=<string> Make compile reproducible using <string>\n"));
3857 for (i = ARRAY_SIZE (f_options); i--;)
3859 const char *description = f_options[i].description;
3861 if (description != NULL && *description != 0)
3862 printf (" -f%-21s %s\n",
3863 f_options[i].string, _(description));
3866 printf (_(" -O[number] Set optimization level to [number]\n"));
3867 printf (_(" -Os Optimize for space rather than speed\n"));
3868 for (i = LAST_PARAM; i--;)
3870 const char *description = compiler_params[i].help;
3871 const int length = 21 - strlen (compiler_params[i].option);
3873 if (description != NULL && *description != 0)
3874 printf (" --param %s=<value>%.*s%s\n",
3875 compiler_params[i].option,
3876 length > 0 ? length : 1, " ",
3877 _(description));
3879 printf (_(" -pedantic Issue warnings needed by strict compliance to ISO C\n"));
3880 printf (_(" -pedantic-errors Like -pedantic except that errors are produced\n"));
3881 printf (_(" -w Suppress warnings\n"));
3883 for (i = ARRAY_SIZE (W_options); i--;)
3885 const char *description = W_options[i].description;
3887 if (description != NULL && *description != 0)
3888 printf (" -W%-21s %s\n",
3889 W_options[i].string, _(description));
3892 printf (_(" -Wextra Print extra (possibly unwanted) warnings\n"));
3893 printf (_(" -Wunused Enable unused warnings\n"));
3894 printf (_(" -Wlarger-than-<number> Warn if an object is larger than <number> bytes\n"));
3895 printf (_(" -p Enable function profiling\n"));
3896 printf (_(" -o <file> Place output into <file> \n"));
3897 printf (_("\
3898 -G <number> Put global and static data smaller than <number>\n\
3899 bytes into a special section (on some targets)\n"));
3901 for (i = ARRAY_SIZE (debug_args); i--;)
3903 if (debug_args[i].description != NULL)
3904 printf (" -g%-21s %s\n",
3905 debug_args[i].arg, _(debug_args[i].description));
3908 printf (_(" -aux-info <file> Emit declaration info into <file>\n"));
3909 printf (_(" -quiet Do not display functions compiled or elapsed time\n"));
3910 printf (_(" -version Display the compiler's version\n"));
3911 printf (_(" -d[letters] Enable dumps from specific passes of the compiler\n"));
3912 printf (_(" -dumpbase <file> Base name to be used for dumps from specific passes\n"));
3913 #if defined INSN_SCHEDULING
3914 printf (_(" -fsched-verbose=<number> Set the verbosity level of the scheduler\n"));
3915 #endif
3916 printf (_(" --help Display this information\n"));
3918 undoc = 0;
3919 lang = "language";
3921 /* Display descriptions of language specific options.
3922 If there is no description, note that there is an undocumented option.
3923 If the description is empty, do not display anything. (This allows
3924 options to be deliberately undocumented, for whatever reason).
3925 If the option string is missing, then this is a marker, indicating
3926 that the description string is in fact the name of a language, whose
3927 language specific options are to follow. */
3929 if (ARRAY_SIZE (documented_lang_options) > 1)
3931 printf (_("\nLanguage specific options:\n"));
3933 for (i = 0; i < ARRAY_SIZE (documented_lang_options); i++)
3935 const char *description = documented_lang_options[i].description;
3936 const char *option = documented_lang_options[i].option;
3938 if (description == NULL)
3940 undoc = 1;
3942 if (extra_warnings)
3943 printf (_(" %-23.23s [undocumented]\n"), option);
3945 else if (*description == 0)
3946 continue;
3947 else if (option == NULL)
3949 if (undoc)
3950 printf
3951 (_("\nThere are undocumented %s specific options as well.\n"),
3952 lang);
3953 undoc = 0;
3955 printf (_("\n Options for %s:\n"), description);
3957 lang = description;
3959 else
3960 printf (" %-23.23s %s\n", option, _(description));
3964 if (undoc)
3965 printf (_("\nThere are undocumented %s specific options as well.\n"),
3966 lang);
3968 display_target_options ();
3971 static void
3972 display_target_options ()
3974 int undoc, i;
3975 static bool displayed = false;
3977 /* Avoid double printing for --help --target-help. */
3978 if (displayed)
3979 return;
3980 displayed = true;
3982 if (ARRAY_SIZE (target_switches) > 1
3983 #ifdef TARGET_OPTIONS
3984 || ARRAY_SIZE (target_options) > 1
3985 #endif
3988 int doc = 0;
3990 undoc = 0;
3992 printf (_("\nTarget specific options:\n"));
3994 for (i = ARRAY_SIZE (target_switches); i--;)
3996 const char *option = target_switches[i].name;
3997 const char *description = target_switches[i].description;
3999 if (option == NULL || *option == 0)
4000 continue;
4001 else if (description == NULL)
4003 undoc = 1;
4005 if (extra_warnings)
4006 printf (_(" -m%-23.23s [undocumented]\n"), option);
4008 else if (*description != 0)
4009 doc += printf (" -m%-23.23s %s\n", option, _(description));
4012 #ifdef TARGET_OPTIONS
4013 for (i = ARRAY_SIZE (target_options); i--;)
4015 const char *option = target_options[i].prefix;
4016 const char *description = target_options[i].description;
4018 if (option == NULL || *option == 0)
4019 continue;
4020 else if (description == NULL)
4022 undoc = 1;
4024 if (extra_warnings)
4025 printf (_(" -m%-23.23s [undocumented]\n"), option);
4027 else if (*description != 0)
4028 doc += printf (" -m%-23.23s %s\n", option, _(description));
4030 #endif
4031 if (undoc)
4033 if (doc)
4034 printf (_("\nThere are undocumented target specific options as well.\n"));
4035 else
4036 printf (_(" They exist, but they are not documented.\n"));
4041 /* Parse a -d... command line switch. */
4043 static void
4044 decode_d_option (arg)
4045 const char *arg;
4047 int i, c, matched;
4049 while (*arg)
4050 switch (c = *arg++)
4052 case 'a':
4053 for (i = 0; i < (int) DFI_MAX; ++i)
4054 dump_file[i].enabled = 1;
4055 break;
4056 case 'A':
4057 flag_debug_asm = 1;
4058 break;
4059 case 'p':
4060 flag_print_asm_name = 1;
4061 break;
4062 case 'P':
4063 flag_dump_rtl_in_asm = 1;
4064 flag_print_asm_name = 1;
4065 break;
4066 case 'v':
4067 graph_dump_format = vcg;
4068 break;
4069 case 'x':
4070 rtl_dump_and_exit = 1;
4071 break;
4072 case 'y':
4073 set_yydebug = 1;
4074 break;
4075 case 'D': /* These are handled by the preprocessor. */
4076 case 'I':
4077 break;
4078 case 'H':
4079 setup_core_dumping();
4080 break;
4082 default:
4083 matched = 0;
4084 for (i = 0; i < (int) DFI_MAX; ++i)
4085 if (c == dump_file[i].debug_switch)
4087 dump_file[i].enabled = 1;
4088 matched = 1;
4091 if (! matched)
4092 warning ("unrecognized gcc debugging option: %c", c);
4093 break;
4097 /* Parse a -f... command line switch. ARG is the value after the -f.
4098 It is safe to access 'ARG - 2' to generate the full switch name.
4099 Return the number of strings consumed. */
4101 static int
4102 decode_f_option (arg)
4103 const char *arg;
4105 int j;
4106 const char *option_value = NULL;
4108 /* Search for the option in the table of binary f options. */
4109 for (j = ARRAY_SIZE (f_options); j--;)
4111 if (!strcmp (arg, f_options[j].string))
4113 *f_options[j].variable = f_options[j].on_value;
4114 return 1;
4117 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4118 && ! strcmp (arg + 3, f_options[j].string))
4120 *f_options[j].variable = ! f_options[j].on_value;
4121 return 1;
4125 if (!strcmp (arg, "fast-math"))
4126 set_fast_math_flags (1);
4127 else if (!strcmp (arg, "no-fast-math"))
4128 set_fast_math_flags (0);
4129 else if ((option_value = skip_leading_substring (arg, "inline-limit-"))
4130 || (option_value = skip_leading_substring (arg, "inline-limit=")))
4132 int val =
4133 read_integral_parameter (option_value, arg - 2,
4134 MAX_INLINE_INSNS);
4135 set_param_value ("max-inline-insns", val);
4136 set_param_value ("max-inline-insns-single", val/2);
4137 set_param_value ("max-inline-insns-auto", val/2);
4138 set_param_value ("max-inline-insns-rtl", val);
4139 if (val/4 < MIN_INLINE_INSNS)
4141 if (val/4 > 10)
4142 set_param_value ("min-inline-insns", val/4);
4143 else
4144 set_param_value ("min-inline-insns", 10);
4147 else if ((option_value = skip_leading_substring (arg, "tls-model=")))
4149 if (strcmp (option_value, "global-dynamic") == 0)
4150 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
4151 else if (strcmp (option_value, "local-dynamic") == 0)
4152 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC;
4153 else if (strcmp (option_value, "initial-exec") == 0)
4154 flag_tls_default = TLS_MODEL_INITIAL_EXEC;
4155 else if (strcmp (option_value, "local-exec") == 0)
4156 flag_tls_default = TLS_MODEL_LOCAL_EXEC;
4157 else
4158 warning ("`%s': unknown tls-model option", arg - 2);
4160 #ifdef INSN_SCHEDULING
4161 else if ((option_value = skip_leading_substring (arg, "sched-verbose=")))
4162 fix_sched_param ("verbose", option_value);
4163 #endif
4164 else if ((option_value = skip_leading_substring (arg, "fixed-")))
4165 fix_register (option_value, 1, 1);
4166 else if ((option_value = skip_leading_substring (arg, "call-used-")))
4167 fix_register (option_value, 0, 1);
4168 else if ((option_value = skip_leading_substring (arg, "call-saved-")))
4169 fix_register (option_value, 0, 0);
4170 else if ((option_value = skip_leading_substring (arg, "align-loops=")))
4171 align_loops = read_integral_parameter (option_value, arg - 2, align_loops);
4172 else if ((option_value = skip_leading_substring (arg, "align-functions=")))
4173 align_functions
4174 = read_integral_parameter (option_value, arg - 2, align_functions);
4175 else if ((option_value = skip_leading_substring (arg, "align-jumps=")))
4176 align_jumps = read_integral_parameter (option_value, arg - 2, align_jumps);
4177 else if ((option_value = skip_leading_substring (arg, "align-labels=")))
4178 align_labels
4179 = read_integral_parameter (option_value, arg - 2, align_labels);
4180 else if ((option_value
4181 = skip_leading_substring (arg, "stack-limit-register=")))
4183 int reg = decode_reg_name (option_value);
4184 if (reg < 0)
4185 error ("unrecognized register name `%s'", option_value);
4186 else
4187 stack_limit_rtx = gen_rtx_REG (Pmode, reg);
4189 else if ((option_value
4190 = skip_leading_substring (arg, "stack-limit-symbol=")))
4192 const char *nm;
4193 nm = ggc_strdup (option_value);
4194 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, nm);
4196 else if ((option_value
4197 = skip_leading_substring (arg, "message-length=")))
4198 output_set_maximum_length
4199 (&global_dc->buffer, read_integral_parameter
4200 (option_value, arg - 2, diagnostic_line_cutoff (global_dc)));
4201 else if ((option_value
4202 = skip_leading_substring (arg, "diagnostics-show-location=")))
4204 if (!strcmp (option_value, "once"))
4205 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
4206 else if (!strcmp (option_value, "every-line"))
4207 diagnostic_prefixing_rule (global_dc)
4208 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE;
4209 else
4210 error ("unrecognized option `%s'", arg - 2);
4212 else if (!strcmp (arg, "no-stack-limit"))
4213 stack_limit_rtx = NULL_RTX;
4214 else if ((option_value = skip_leading_substring (arg, "random-seed=")))
4215 flag_random_seed = option_value;
4216 else if (!strcmp (arg, "no-random-seed"))
4217 flag_random_seed = NULL;
4218 else if (!strcmp (arg, "preprocessed"))
4219 /* Recognize this switch but do nothing. This prevents warnings
4220 about an unrecognized switch if cpplib has not been linked in. */
4222 else
4223 return 0;
4225 return 1;
4228 /* Parse a -W... command line switch. ARG is the value after the -W.
4229 It is safe to access 'ARG - 2' to generate the full switch name.
4230 Return the number of strings consumed. */
4232 static int
4233 decode_W_option (arg)
4234 const char *arg;
4236 const char *option_value = NULL;
4237 int j;
4239 /* Search for the option in the table of binary W options. */
4241 for (j = ARRAY_SIZE (W_options); j--;)
4243 if (!strcmp (arg, W_options[j].string))
4245 *W_options[j].variable = W_options[j].on_value;
4246 return 1;
4249 if (arg[0] == 'n' && arg[1] == 'o' && arg[2] == '-'
4250 && ! strcmp (arg + 3, W_options[j].string))
4252 *W_options[j].variable = ! W_options[j].on_value;
4253 return 1;
4257 if ((option_value = skip_leading_substring (arg, "id-clash-")))
4258 warning ("-Wid-clash-LEN is no longer supported");
4259 else if ((option_value = skip_leading_substring (arg, "larger-than-")))
4261 larger_than_size = read_integral_parameter (option_value, arg - 2, -1);
4263 warn_larger_than = larger_than_size != -1;
4265 else if (!strcmp (arg, "unused"))
4267 set_Wunused (1);
4269 else if (!strcmp (arg, "no-unused"))
4271 set_Wunused (0);
4273 else if (!strcmp (arg, "extra"))
4275 set_Wextra (1);
4277 else if (!strcmp (arg, "no-extra"))
4279 set_Wextra (0);
4281 else
4282 return 0;
4284 return 1;
4287 /* Indexed by enum debug_info_type. */
4288 const char *const debug_type_names[] =
4290 "none", "stabs", "coff", "dwarf-1", "dwarf-2", "xcoff", "vms"
4293 /* Parse a -g... command line switch. ARG is the value after the -g.
4294 It is safe to access 'ARG - 2' to generate the full switch name.
4295 Return the number of strings consumed. */
4297 static int
4298 decode_g_option (arg)
4299 const char *arg;
4301 static unsigned level = 0;
4302 /* A lot of code assumes write_symbols == NO_DEBUG if the
4303 debugging level is 0 (thus -gstabs1 -gstabs0 would lose track
4304 of what debugging type has been selected). This records the
4305 selected type. It is an error to specify more than one
4306 debugging type. */
4307 static enum debug_info_type selected_debug_type = NO_DEBUG;
4308 /* Nonzero if debugging format has been explicitly set.
4309 -g and -ggdb don't explicitly set the debugging format so
4310 -gdwarf -g3 is equivalent to -gdwarf3. */
4311 static int type_explicitly_set_p = 0;
4313 /* The maximum admissible debug level value. */
4314 static const unsigned max_debug_level = 3;
4316 /* Look up ARG in the table. */
4317 for (da = debug_args; da->arg; da++)
4319 const int da_len = strlen (da->arg);
4321 if (da_len == 0 || ! strncmp (arg, da->arg, da_len))
4323 enum debug_info_type type = da->debug_type;
4324 const char *p = arg + da_len;
4326 if (*p && ! ISDIGIT (*p))
4327 continue;
4329 /* A debug flag without a level defaults to level 2.
4330 Note we do not want to call read_integral_parameter
4331 for that case since it will call atoi which
4332 will return zero.
4334 ??? We may want to generalize the interface to
4335 read_integral_parameter to better handle this case
4336 if this case shows up often. */
4337 if (*p)
4338 level = read_integral_parameter (p, 0, max_debug_level + 1);
4339 else
4340 level = (level == 0) ? 2 : level;
4342 if (da_len > 1 && *p && !strncmp (arg, "dwarf", da_len))
4344 error ("use -gdwarf -g%d for DWARF v1, level %d",
4345 level, level);
4346 if (level == 2)
4347 error ("use -gdwarf-2 for DWARF v2");
4350 if (level > max_debug_level)
4352 warning ("\
4353 ignoring option `%s' due to invalid debug level specification",
4354 arg - 2);
4355 level = debug_info_level;
4358 if (type == NO_DEBUG)
4360 type = PREFERRED_DEBUGGING_TYPE;
4362 if (da_len > 1 && strncmp (arg, "gdb", da_len) == 0)
4364 #ifdef DWARF2_DEBUGGING_INFO
4365 type = DWARF2_DEBUG;
4366 #else
4367 #ifdef DBX_DEBUGGING_INFO
4368 type = DBX_DEBUG;
4369 #endif
4370 #endif
4374 if (type == NO_DEBUG)
4375 warning ("`%s': unknown or unsupported -g option", arg - 2);
4377 /* Does it conflict with an already selected type? */
4378 if (type_explicitly_set_p
4379 /* -g/-ggdb don't conflict with anything. */
4380 && da->debug_type != NO_DEBUG
4381 && type != selected_debug_type)
4382 warning ("`%s' ignored, conflicts with `-g%s'",
4383 arg - 2, debug_type_names[(int) selected_debug_type]);
4384 else
4386 /* If the format has already been set, -g/-ggdb
4387 only change the debug level. */
4388 if (type_explicitly_set_p && da->debug_type == NO_DEBUG)
4389 /* Don't change debugging type. */
4391 else
4393 selected_debug_type = type;
4394 type_explicitly_set_p = da->debug_type != NO_DEBUG;
4397 write_symbols = (level == 0
4398 ? NO_DEBUG
4399 : selected_debug_type);
4400 use_gnu_debug_info_extensions = da->use_extensions_p;
4401 debug_info_level = (enum debug_info_level) level;
4404 break;
4408 if (! da->arg)
4409 return 0;
4411 return 1;
4414 /* Decode the first argument in the argv as a language-independent option.
4415 Return the number of strings consumed. */
4417 static unsigned int
4418 independent_decode_option (argc, argv)
4419 int argc;
4420 char **argv;
4422 char *arg = argv[0];
4424 if (arg[0] != '-' || arg[1] == 0)
4426 if (arg[0] == '+')
4427 return 0;
4429 filename = arg;
4431 return 1;
4434 arg++;
4436 if (!strcmp (arg, "-help"))
4438 display_help ();
4439 exit_after_options = 1;
4440 return 1;
4443 if (!strcmp (arg, "-target-help"))
4445 display_target_options ();
4446 exit_after_options = 1;
4447 return 1;
4450 if (!strcmp (arg, "-version"))
4452 print_version (stderr, "");
4453 exit_after_options = 1;
4454 return 1;
4457 /* Handle '--param <name>=<value>'. */
4458 if (strcmp (arg, "-param") == 0)
4460 char *equal;
4462 if (argc == 1)
4464 error ("-param option missing argument");
4465 return 1;
4468 /* Get the '<name>=<value>' parameter. */
4469 arg = argv[1];
4470 /* Look for the `='. */
4471 equal = strchr (arg, '=');
4472 if (!equal)
4473 error ("invalid --param option: %s", arg);
4474 else
4476 int val;
4478 /* Zero out the `=' sign so that we get two separate strings. */
4479 *equal = '\0';
4480 /* Figure out what value is specified. */
4481 val = read_integral_parameter (equal + 1, NULL, INVALID_PARAM_VAL);
4482 if (val != INVALID_PARAM_VAL)
4483 set_param_value (arg, val);
4484 else
4485 error ("invalid parameter value `%s'", equal + 1);
4488 return 2;
4491 switch (*arg)
4493 default:
4494 return 0;
4496 case 'O':
4497 /* Already been treated in main (). Do nothing. */
4498 break;
4500 case 'm':
4501 set_target_switch (arg + 1);
4502 break;
4504 case 'f':
4505 return decode_f_option (arg + 1);
4507 case 'g':
4508 return decode_g_option (arg + 1);
4510 case 'd':
4511 if (!strcmp (arg, "dumpbase"))
4513 if (argc == 1)
4514 return 0;
4516 if (argv[1][0])
4517 dump_base_name = argv[1];
4519 return 2;
4521 else
4522 decode_d_option (arg + 1);
4523 break;
4525 case 'p':
4526 if (!strcmp (arg, "pedantic"))
4527 pedantic = 1;
4528 else if (!strcmp (arg, "pedantic-errors"))
4529 flag_pedantic_errors = pedantic = 1;
4530 else if (arg[1] == 0)
4531 profile_flag = 1;
4532 else
4533 return 0;
4534 break;
4536 case 'q':
4537 if (!strcmp (arg, "quiet"))
4538 quiet_flag = 1;
4539 else
4540 return 0;
4541 break;
4543 case 'v':
4544 if (!strcmp (arg, "version"))
4545 version_flag = 1;
4546 else
4547 return 0;
4548 break;
4550 case 'w':
4551 if (arg[1] == 0)
4552 inhibit_warnings = 1;
4553 else
4554 return 0;
4555 break;
4557 case 'W':
4558 /* For backward compatibility, -W is the same as -Wextra. */
4559 if (arg[1] == 0)
4560 set_Wextra (1);
4561 else
4562 return decode_W_option (arg + 1);
4563 break;
4565 case 'a':
4566 if (!strncmp (arg, "aux-info", 8))
4568 if (arg[8] == '\0')
4570 if (argc == 1)
4571 return 0;
4573 aux_info_file_name = argv[1];
4574 flag_gen_aux_info = 1;
4575 return 2;
4577 else if (arg[8] == '=')
4579 aux_info_file_name = arg + 9;
4580 flag_gen_aux_info = 1;
4582 else
4583 return 0;
4585 else if (!strcmp (arg, "auxbase"))
4587 if (argc == 1)
4588 return 0;
4590 if (argv[1][0])
4591 aux_base_name = argv[1];
4593 return 2;
4595 else if (!strcmp (arg, "auxbase-strip"))
4597 if (argc == 1)
4598 return 0;
4600 if (argv[1][0])
4602 strip_off_ending (argv[1], strlen (argv[1]));
4603 if (argv[1][0])
4604 aux_base_name = argv[1];
4607 return 2;
4609 else
4610 return 0;
4611 break;
4613 case 'o':
4614 if (arg[1] == 0)
4616 if (argc == 1)
4617 return 0;
4619 asm_file_name = argv[1];
4620 return 2;
4622 return 0;
4624 case 'G':
4626 int g_switch_val;
4627 int return_val;
4629 if (arg[1] == 0)
4631 if (argc == 1)
4632 return 0;
4634 g_switch_val = read_integral_parameter (argv[1], 0, -1);
4635 return_val = 2;
4637 else
4639 g_switch_val = read_integral_parameter (arg + 1, 0, -1);
4640 return_val = 1;
4643 if (g_switch_val == -1)
4644 return_val = 0;
4645 else
4647 g_switch_set = TRUE;
4648 g_switch_value = g_switch_val;
4651 return return_val;
4655 return 1;
4658 /* Decode -m switches. */
4659 /* Decode the switch -mNAME. */
4661 static void
4662 set_target_switch (name)
4663 const char *name;
4665 size_t j;
4666 int valid_target_option = 0;
4668 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4669 if (!strcmp (target_switches[j].name, name))
4671 if (target_switches[j].value < 0)
4672 target_flags &= ~-target_switches[j].value;
4673 else
4674 target_flags |= target_switches[j].value;
4675 if (name[0] != 0)
4677 if (target_switches[j].value < 0)
4678 target_flags_explicit |= -target_switches[j].value;
4679 else
4680 target_flags_explicit |= target_switches[j].value;
4682 valid_target_option = 1;
4685 #ifdef TARGET_OPTIONS
4686 if (!valid_target_option)
4687 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4689 int len = strlen (target_options[j].prefix);
4690 if (target_options[j].value)
4692 if (!strcmp (target_options[j].prefix, name))
4694 *target_options[j].variable = target_options[j].value;
4695 valid_target_option = 1;
4698 else
4700 if (!strncmp (target_options[j].prefix, name, len))
4702 *target_options[j].variable = name + len;
4703 valid_target_option = 1;
4707 #endif
4709 if (!valid_target_option)
4710 error ("invalid option `%s'", name);
4713 /* Print version information to FILE.
4714 Each line begins with INDENT (for the case where FILE is the
4715 assembler output file). */
4717 static void
4718 print_version (file, indent)
4719 FILE *file;
4720 const char *indent;
4722 #ifndef __VERSION__
4723 #define __VERSION__ "[?]"
4724 #endif
4725 fnotice (file,
4726 #ifdef __GNUC__
4727 "%s%s%s version %s (%s)\n%s\tcompiled by GNU C version %s.\n"
4728 #else
4729 "%s%s%s version %s (%s) compiled by CC.\n"
4730 #endif
4731 , indent, *indent != 0 ? " " : "",
4732 lang_hooks.name, version_string, TARGET_NAME,
4733 indent, __VERSION__);
4734 fnotice (file, "%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n",
4735 indent, *indent != 0 ? " " : "",
4736 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
4739 /* Print an option value and return the adjusted position in the line.
4740 ??? We don't handle error returns from fprintf (disk full); presumably
4741 other code will catch a disk full though. */
4743 static int
4744 print_single_switch (file, pos, max, indent, sep, term, type, name)
4745 FILE *file;
4746 int pos, max;
4747 const char *indent, *sep, *term, *type, *name;
4749 /* The ultrix fprintf returns 0 on success, so compute the result we want
4750 here since we need it for the following test. */
4751 int len = strlen (sep) + strlen (type) + strlen (name);
4753 if (pos != 0
4754 && pos + len > max)
4756 fprintf (file, "%s", term);
4757 pos = 0;
4759 if (pos == 0)
4761 fprintf (file, "%s", indent);
4762 pos = strlen (indent);
4764 fprintf (file, "%s%s%s", sep, type, name);
4765 pos += len;
4766 return pos;
4769 /* Print active target switches to FILE.
4770 POS is the current cursor position and MAX is the size of a "line".
4771 Each line begins with INDENT and ends with TERM.
4772 Each switch is separated from the next by SEP. */
4774 static void
4775 print_switch_values (file, pos, max, indent, sep, term)
4776 FILE *file;
4777 int pos, max;
4778 const char *indent, *sep, *term;
4780 size_t j;
4781 char **p;
4783 /* Fill in the -frandom-seed option, if the user didn't pass it, so
4784 that it can be printed below. This helps reproducibility. Of
4785 course, the string may never be used, but we can't tell that at
4786 this point in the compile. */
4787 default_flag_random_seed ();
4789 /* Print the options as passed. */
4791 pos = print_single_switch (file, pos, max, indent, *indent ? " " : "", term,
4792 _("options passed: "), "");
4794 for (p = &save_argv[1]; *p != NULL; p++)
4795 if (**p == '-')
4797 /* Ignore these. */
4798 if (strcmp (*p, "-o") == 0)
4800 if (p[1] != NULL)
4801 p++;
4802 continue;
4804 if (strcmp (*p, "-quiet") == 0)
4805 continue;
4806 if (strcmp (*p, "-version") == 0)
4807 continue;
4808 if ((*p)[1] == 'd')
4809 continue;
4811 pos = print_single_switch (file, pos, max, indent, sep, term, *p, "");
4813 if (pos > 0)
4814 fprintf (file, "%s", term);
4816 /* Print the -f and -m options that have been enabled.
4817 We don't handle language specific options but printing argv
4818 should suffice. */
4820 pos = print_single_switch (file, 0, max, indent, *indent ? " " : "", term,
4821 _("options enabled: "), "");
4823 for (j = 0; j < ARRAY_SIZE (f_options); j++)
4824 if (*f_options[j].variable == f_options[j].on_value)
4825 pos = print_single_switch (file, pos, max, indent, sep, term,
4826 "-f", f_options[j].string);
4828 /* Print target specific options. */
4830 for (j = 0; j < ARRAY_SIZE (target_switches); j++)
4831 if (target_switches[j].name[0] != '\0'
4832 && target_switches[j].value > 0
4833 && ((target_switches[j].value & target_flags)
4834 == target_switches[j].value))
4836 pos = print_single_switch (file, pos, max, indent, sep, term,
4837 "-m", target_switches[j].name);
4840 #ifdef TARGET_OPTIONS
4841 for (j = 0; j < ARRAY_SIZE (target_options); j++)
4842 if (*target_options[j].variable != NULL)
4844 char prefix[256];
4845 sprintf (prefix, "-m%s", target_options[j].prefix);
4846 pos = print_single_switch (file, pos, max, indent, sep, term,
4847 prefix, *target_options[j].variable);
4849 #endif
4851 fprintf (file, "%s", term);
4854 /* Open assembly code output file. Do this even if -fsyntax-only is
4855 on, because then the driver will have provided the name of a
4856 temporary file or bit bucket for us. NAME is the file specified on
4857 the command line, possibly NULL. */
4858 static void
4859 init_asm_output (name)
4860 const char *name;
4862 if (name == NULL && asm_file_name == 0)
4863 asm_out_file = stdout;
4864 else
4866 if (asm_file_name == 0)
4868 int len = strlen (dump_base_name);
4869 char *dumpname = (char *) xmalloc (len + 6);
4870 memcpy (dumpname, dump_base_name, len + 1);
4871 strip_off_ending (dumpname, len);
4872 strcat (dumpname, ".s");
4873 asm_file_name = dumpname;
4875 if (!strcmp (asm_file_name, "-"))
4876 asm_out_file = stdout;
4877 else
4878 asm_out_file = fopen (asm_file_name, "w+");
4879 if (asm_out_file == 0)
4880 fatal_io_error ("can't open %s for writing", asm_file_name);
4883 #ifdef IO_BUFFER_SIZE
4884 setvbuf (asm_out_file, (char *) xmalloc (IO_BUFFER_SIZE),
4885 _IOFBF, IO_BUFFER_SIZE);
4886 #endif
4888 if (!flag_syntax_only)
4890 #ifdef ASM_FILE_START
4891 ASM_FILE_START (asm_out_file);
4892 #endif
4894 #ifdef ASM_COMMENT_START
4895 if (flag_verbose_asm)
4897 /* Print the list of options in effect. */
4898 print_version (asm_out_file, ASM_COMMENT_START);
4899 print_switch_values (asm_out_file, 0, MAX_LINE,
4900 ASM_COMMENT_START, " ", "\n");
4901 /* Add a blank line here so it appears in assembler output but not
4902 screen output. */
4903 fprintf (asm_out_file, "\n");
4905 #endif
4909 /* Initialization of the front end environment, before command line
4910 options are parsed. Signal handlers, internationalization etc.
4911 ARGV0 is main's argv[0]. */
4912 static void
4913 general_init (argv0)
4914 char *argv0;
4916 char *p;
4918 p = argv0 + strlen (argv0);
4919 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
4920 --p;
4921 progname = p;
4923 xmalloc_set_program_name (progname);
4925 hex_init ();
4927 gcc_init_libintl ();
4929 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
4930 #ifdef SIGSEGV
4931 signal (SIGSEGV, crash_signal);
4932 #endif
4933 #ifdef SIGILL
4934 signal (SIGILL, crash_signal);
4935 #endif
4936 #ifdef SIGBUS
4937 signal (SIGBUS, crash_signal);
4938 #endif
4939 #ifdef SIGABRT
4940 signal (SIGABRT, crash_signal);
4941 #endif
4942 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
4943 signal (SIGIOT, crash_signal);
4944 #endif
4945 #ifdef SIGFPE
4946 signal (SIGFPE, crash_signal);
4947 #endif
4949 /* Other host-specific signal setup. */
4950 (*host_hooks.extra_signals)();
4952 /* Initialize the diagnostics reporting machinery, so option parsing
4953 can give warnings and errors. */
4954 diagnostic_initialize (global_dc);
4956 /* Initialize the garbage-collector, string pools and tree type hash
4957 table. */
4958 init_ggc ();
4959 init_stringpool ();
4960 init_ttree ();
4963 /* Parse command line options and set default flag values, called
4964 after language-independent option-independent initialization. Do
4965 minimal options processing. Outputting diagnostics is OK, but GC
4966 and identifier hashtables etc. are not initialized yet.
4968 Return nonzero to suppress compiler back end initialization. */
4969 static void
4970 parse_options_and_default_flags (argc, argv)
4971 int argc;
4972 char **argv;
4974 int i;
4976 /* Save in case md file wants to emit args as a comment. */
4977 save_argc = argc;
4978 save_argv = argv;
4980 /* Initialize register usage now so switches may override. */
4981 init_reg_sets ();
4983 /* Register the language-independent parameters. */
4984 add_params (lang_independent_params, LAST_PARAM);
4986 /* This must be done after add_params but before argument processing. */
4987 init_ggc_heuristics();
4989 /* Perform language-specific options initialization. */
4990 (*lang_hooks.init_options) ();
4992 /* Scan to see what optimization level has been specified. That will
4993 determine the default value of many flags. */
4994 for (i = 1; i < argc; i++)
4996 if (!strcmp (argv[i], "-O"))
4998 optimize = 1;
4999 optimize_size = 0;
5001 else if (argv[i][0] == '-' && argv[i][1] == 'O')
5003 /* Handle -Os, -O2, -O3, -O69, ... */
5004 char *p = &argv[i][2];
5006 if ((p[0] == 's') && (p[1] == 0))
5008 optimize_size = 1;
5010 /* Optimizing for size forces optimize to be 2. */
5011 optimize = 2;
5013 else
5015 const int optimize_val = read_integral_parameter (p, p - 2, -1);
5016 if (optimize_val != -1)
5018 optimize = optimize_val;
5019 optimize_size = 0;
5025 if (!optimize)
5027 flag_merge_constants = 0;
5030 if (optimize >= 1)
5032 flag_defer_pop = 1;
5033 flag_thread_jumps = 1;
5034 #ifdef DELAY_SLOTS
5035 flag_delayed_branch = 1;
5036 #endif
5037 #ifdef CAN_DEBUG_WITHOUT_FP
5038 flag_omit_frame_pointer = 1;
5039 #endif
5040 flag_guess_branch_prob = 1;
5041 flag_cprop_registers = 1;
5042 flag_loop_optimize = 1;
5043 flag_crossjumping = 1;
5044 flag_if_conversion = 1;
5045 flag_if_conversion2 = 1;
5048 if (optimize >= 2)
5050 flag_optimize_sibling_calls = 1;
5051 flag_cse_follow_jumps = 1;
5052 flag_cse_skip_blocks = 1;
5053 flag_gcse = 1;
5054 flag_expensive_optimizations = 1;
5055 flag_strength_reduce = 1;
5056 flag_rerun_cse_after_loop = 1;
5057 flag_rerun_loop_opt = 1;
5058 flag_caller_saves = 1;
5059 flag_force_mem = 1;
5060 flag_peephole2 = 1;
5061 #ifdef INSN_SCHEDULING
5062 flag_schedule_insns = 1;
5063 flag_schedule_insns_after_reload = 1;
5064 #endif
5065 flag_regmove = 1;
5066 flag_strict_aliasing = 1;
5067 flag_delete_null_pointer_checks = 1;
5068 flag_reorder_blocks = 1;
5069 flag_reorder_functions = 1;
5072 if (optimize >= 3)
5074 flag_inline_functions = 1;
5075 flag_rename_registers = 1;
5076 flag_unswitch_loops = 1;
5077 flag_unit_at_a_time = 1;
5080 if (optimize < 2 || optimize_size)
5082 align_loops = 1;
5083 align_jumps = 1;
5084 align_labels = 1;
5085 align_functions = 1;
5087 /* Don't reorder blocks when optimizing for size because extra
5088 jump insns may be created; also barrier may create extra padding.
5090 More correctly we should have a block reordering mode that tried
5091 to minimize the combined size of all the jumps. This would more
5092 or less automatically remove extra jumps, but would also try to
5093 use more short jumps instead of long jumps. */
5094 flag_reorder_blocks = 0;
5097 /* Initialize whether `char' is signed. */
5098 flag_signed_char = DEFAULT_SIGNED_CHAR;
5099 #ifdef DEFAULT_SHORT_ENUMS
5100 /* Initialize how much space enums occupy, by default. */
5101 flag_short_enums = DEFAULT_SHORT_ENUMS;
5102 #endif
5104 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can
5105 modify it. */
5106 target_flags = 0;
5107 set_target_switch ("");
5109 /* Unwind tables are always present in an ABI-conformant IA-64
5110 object file, so the default should be ON. */
5111 #ifdef IA64_UNWIND_INFO
5112 flag_unwind_tables = IA64_UNWIND_INFO;
5113 #endif
5115 #ifdef OPTIMIZATION_OPTIONS
5116 /* Allow default optimizations to be specified on a per-machine basis. */
5117 OPTIMIZATION_OPTIONS (optimize, optimize_size);
5118 #endif
5120 /* Perform normal command line switch decoding. */
5121 for (i = 1; i < argc;)
5123 int lang_processed;
5124 int indep_processed;
5126 /* Give the language a chance to decode the option for itself. */
5127 lang_processed = (*lang_hooks.decode_option) (argc - i, argv + i);
5129 if (lang_processed >= 0)
5130 /* Now see if the option also has a language independent meaning.
5131 Some options are both language specific and language independent,
5132 eg --help. */
5133 indep_processed = independent_decode_option (argc - i, argv + i);
5134 else
5136 lang_processed = -lang_processed;
5137 indep_processed = 0;
5140 if (lang_processed || indep_processed)
5141 i += MAX (lang_processed, indep_processed);
5142 else
5144 const char *option = NULL;
5145 const char *lang = NULL;
5146 unsigned int j;
5148 /* It is possible that the command line switch is not valid for the
5149 current language, but it is valid for another language. In order
5150 to be compatible with previous versions of the compiler (which
5151 did not issue an error message in this case) we check for this
5152 possibility here. If we do find a match, then if extra_warnings
5153 is set we generate a warning message, otherwise we will just
5154 ignore the option. */
5155 for (j = 0; j < ARRAY_SIZE (documented_lang_options); j++)
5157 option = documented_lang_options[j].option;
5159 if (option == NULL)
5160 lang = documented_lang_options[j].description;
5161 else if (! strncmp (argv[i], option, strlen (option)))
5162 break;
5165 if (j != ARRAY_SIZE (documented_lang_options))
5167 if (extra_warnings)
5169 warning ("ignoring command line option '%s'", argv[i]);
5170 if (lang)
5171 warning
5172 ("(it is valid for %s but not the selected language)",
5173 lang);
5176 else if (argv[i][0] == '-' && argv[i][1] == 'g')
5177 warning ("`%s': unknown or unsupported -g option", &argv[i][2]);
5178 else
5179 error ("unrecognized option `%s'", argv[i]);
5181 i++;
5185 if (flag_no_inline == 2)
5186 flag_no_inline = 0;
5187 else
5188 flag_really_no_inline = flag_no_inline;
5190 /* Set flag_no_inline before the post_options () hook. The C front
5191 ends use it to determine tree inlining defaults. FIXME: such
5192 code should be lang-independent when all front ends use tree
5193 inlining, in which case it, and this condition, should be moved
5194 to the top of process_options() instead. */
5195 if (optimize == 0)
5197 /* Inlining does not work if not optimizing,
5198 so force it not to be done. */
5199 flag_no_inline = 1;
5200 warn_inline = 0;
5202 /* The c_decode_option function and decode_option hook set
5203 this to `2' if -Wall is used, so we can avoid giving out
5204 lots of errors for people who don't realize what -Wall does. */
5205 if (warn_uninitialized == 1)
5206 warning ("-Wuninitialized is not supported without -O");
5209 if (flag_really_no_inline == 2)
5210 flag_really_no_inline = flag_no_inline;
5213 /* Process the options that have been parsed. */
5214 static void
5215 process_options ()
5217 /* Allow the front end to perform consistency checks and do further
5218 initialization based on the command line options. This hook also
5219 sets the original filename if appropriate (e.g. foo.i -> foo.c)
5220 so we can correctly initialize debug output. */
5221 no_backend = (*lang_hooks.post_options) (&filename);
5222 main_input_filename = input_filename = filename;
5224 #ifdef OVERRIDE_OPTIONS
5225 /* Some machines may reject certain combinations of options. */
5226 OVERRIDE_OPTIONS;
5227 #endif
5229 /* Set aux_base_name if not already set. */
5230 if (aux_base_name)
5232 else if (filename)
5234 char *name = xstrdup (lbasename (filename));
5236 strip_off_ending (name, strlen (name));
5237 aux_base_name = name;
5239 else
5240 aux_base_name = "gccaux";
5242 /* Set up the align_*_log variables, defaulting them to 1 if they
5243 were still unset. */
5244 if (align_loops <= 0) align_loops = 1;
5245 if (align_loops_max_skip > align_loops || !align_loops)
5246 align_loops_max_skip = align_loops - 1;
5247 align_loops_log = floor_log2 (align_loops * 2 - 1);
5248 if (align_jumps <= 0) align_jumps = 1;
5249 if (align_jumps_max_skip > align_jumps || !align_jumps)
5250 align_jumps_max_skip = align_jumps - 1;
5251 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
5252 if (align_labels <= 0) align_labels = 1;
5253 align_labels_log = floor_log2 (align_labels * 2 - 1);
5254 if (align_labels_max_skip > align_labels || !align_labels)
5255 align_labels_max_skip = align_labels - 1;
5256 if (align_functions <= 0) align_functions = 1;
5257 align_functions_log = floor_log2 (align_functions * 2 - 1);
5259 /* Unrolling all loops implies that standard loop unrolling must also
5260 be done. */
5261 if (flag_unroll_all_loops)
5262 flag_unroll_loops = 1;
5264 if (flag_unroll_loops)
5266 flag_old_unroll_loops = 0;
5267 flag_old_unroll_all_loops = 0;
5270 if (flag_old_unroll_all_loops)
5271 flag_old_unroll_loops = 1;
5273 /* Old loop unrolling requires that strength_reduction be on also. Silently
5274 turn on strength reduction here if it isn't already on. Also, the loop
5275 unrolling code assumes that cse will be run after loop, so that must
5276 be turned on also. */
5277 if (flag_old_unroll_loops)
5279 flag_strength_reduce = 1;
5280 flag_rerun_cse_after_loop = 1;
5282 if (flag_unroll_loops || flag_peel_loops)
5283 flag_rerun_cse_after_loop = 1;
5285 if (flag_non_call_exceptions)
5286 flag_asynchronous_unwind_tables = 1;
5287 if (flag_asynchronous_unwind_tables)
5288 flag_unwind_tables = 1;
5290 /* Disable unit-at-a-time mode for frontends not supporting callgraph
5291 interface. */
5292 if (flag_unit_at_a_time && ! lang_hooks.callgraph.expand_function)
5293 flag_unit_at_a_time = 0;
5295 /* Warn about options that are not supported on this machine. */
5296 #ifndef INSN_SCHEDULING
5297 if (flag_schedule_insns || flag_schedule_insns_after_reload)
5298 warning ("instruction scheduling not supported on this target machine");
5299 #endif
5300 #ifndef DELAY_SLOTS
5301 if (flag_delayed_branch)
5302 warning ("this target machine does not have delayed branches");
5303 #endif
5305 user_label_prefix = USER_LABEL_PREFIX;
5306 if (flag_leading_underscore != -1)
5308 /* If the default prefix is more complicated than "" or "_",
5309 issue a warning and ignore this option. */
5310 if (user_label_prefix[0] == 0 ||
5311 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
5313 user_label_prefix = flag_leading_underscore ? "_" : "";
5315 else
5316 warning ("-f%sleading-underscore not supported on this target machine",
5317 flag_leading_underscore ? "" : "no-");
5320 /* If we are in verbose mode, write out the version and maybe all the
5321 option flags in use. */
5322 if (version_flag)
5324 print_version (stderr, "");
5325 if (! quiet_flag)
5326 print_switch_values (stderr, 0, MAX_LINE, "", " ", "\n");
5329 if (flag_syntax_only)
5331 write_symbols = NO_DEBUG;
5332 profile_flag = 0;
5335 /* Now we know write_symbols, set up the debug hooks based on it.
5336 By default we do nothing for debug output. */
5337 #if defined(DBX_DEBUGGING_INFO)
5338 if (write_symbols == DBX_DEBUG)
5339 debug_hooks = &dbx_debug_hooks;
5340 #endif
5341 #if defined(XCOFF_DEBUGGING_INFO)
5342 if (write_symbols == XCOFF_DEBUG)
5343 debug_hooks = &xcoff_debug_hooks;
5344 #endif
5345 #ifdef SDB_DEBUGGING_INFO
5346 if (write_symbols == SDB_DEBUG)
5347 debug_hooks = &sdb_debug_hooks;
5348 #endif
5349 #ifdef DWARF_DEBUGGING_INFO
5350 if (write_symbols == DWARF_DEBUG)
5351 debug_hooks = &dwarf_debug_hooks;
5352 #endif
5353 #ifdef DWARF2_DEBUGGING_INFO
5354 if (write_symbols == DWARF2_DEBUG)
5355 debug_hooks = &dwarf2_debug_hooks;
5356 #endif
5357 #ifdef VMS_DEBUGGING_INFO
5358 if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
5359 debug_hooks = &vmsdbg_debug_hooks;
5360 #endif
5362 /* If auxiliary info generation is desired, open the output file.
5363 This goes in the same directory as the source file--unlike
5364 all the other output files. */
5365 if (flag_gen_aux_info)
5367 aux_info_file = fopen (aux_info_file_name, "w");
5368 if (aux_info_file == 0)
5369 fatal_io_error ("can't open %s", aux_info_file_name);
5372 if (! targetm.have_named_sections)
5374 if (flag_function_sections)
5376 warning ("-ffunction-sections not supported for this target");
5377 flag_function_sections = 0;
5379 if (flag_data_sections)
5381 warning ("-fdata-sections not supported for this target");
5382 flag_data_sections = 0;
5386 if (flag_function_sections && profile_flag)
5388 warning ("-ffunction-sections disabled; it makes profiling impossible");
5389 flag_function_sections = 0;
5392 #ifndef HAVE_prefetch
5393 if (flag_prefetch_loop_arrays)
5395 warning ("-fprefetch-loop-arrays not supported for this target");
5396 flag_prefetch_loop_arrays = 0;
5398 #else
5399 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
5401 warning ("-fprefetch-loop-arrays not supported for this target (try -march switches)");
5402 flag_prefetch_loop_arrays = 0;
5404 #endif
5406 /* This combination of options isn't handled for i386 targets and doesn't
5407 make much sense anyway, so don't allow it. */
5408 if (flag_prefetch_loop_arrays && optimize_size)
5410 warning ("-fprefetch-loop-arrays is not supported with -Os");
5411 flag_prefetch_loop_arrays = 0;
5414 #ifndef OBJECT_FORMAT_ELF
5415 if (flag_function_sections && write_symbols != NO_DEBUG)
5416 warning ("-ffunction-sections may affect debugging on some targets");
5417 #endif
5419 /* The presence of IEEE signaling NaNs, implies all math can trap. */
5420 if (flag_signaling_nans)
5421 flag_trapping_math = 1;
5424 /* Initialize the compiler back end. */
5425 static void
5426 backend_init ()
5428 /* init_emit_once uses reg_raw_mode and therefore must be called
5429 after init_regs which initialized reg_raw_mode. */
5430 init_regs ();
5431 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
5432 || debug_info_level == DINFO_LEVEL_VERBOSE
5433 #ifdef VMS_DEBUGGING_INFO
5434 /* Enable line number info for traceback */
5435 || debug_info_level > DINFO_LEVEL_NONE
5436 #endif
5437 || flag_test_coverage
5438 || warn_notreached);
5439 init_fake_stack_mems ();
5440 init_alias_once ();
5441 init_loop ();
5442 init_reload ();
5443 init_function_once ();
5444 init_varasm_once ();
5446 /* The following initialization functions need to generate rtl, so
5447 provide a dummy function context for them. */
5448 init_dummy_function_start ();
5449 init_expmed ();
5450 if (flag_caller_saves)
5451 init_caller_save ();
5452 expand_dummy_function_end ();
5455 /* Language-dependent initialization. Returns nonzero on success. */
5456 static int
5457 lang_dependent_init (name)
5458 const char *name;
5460 if (dump_base_name == 0)
5461 dump_base_name = name ? name : "gccdump";
5463 /* Other front-end initialization. */
5464 if ((*lang_hooks.init) () == 0)
5465 return 0;
5467 init_asm_output (name);
5469 /* These create various _DECL nodes, so need to be called after the
5470 front end is initialized. */
5471 init_eh ();
5472 init_optabs ();
5474 /* The following initialization functions need to generate rtl, so
5475 provide a dummy function context for them. */
5476 init_dummy_function_start ();
5477 init_expr_once ();
5478 expand_dummy_function_end ();
5480 /* Put an entry on the input file stack for the main input file. */
5481 push_srcloc (input_filename, 0);
5483 /* If dbx symbol table desired, initialize writing it and output the
5484 predefined types. */
5485 timevar_push (TV_SYMOUT);
5487 #ifdef DWARF2_UNWIND_INFO
5488 if (dwarf2out_do_frame ())
5489 dwarf2out_frame_init ();
5490 #endif
5492 /* Now we have the correct original filename, we can initialize
5493 debug output. */
5494 (*debug_hooks->init) (name);
5496 timevar_pop (TV_SYMOUT);
5498 return 1;
5501 /* Clean up: close opened files, etc. */
5503 static void
5504 finalize ()
5506 /* Close the dump files. */
5507 if (flag_gen_aux_info)
5509 fclose (aux_info_file);
5510 if (errorcount)
5511 unlink (aux_info_file_name);
5514 /* Close non-debugging input and output files. Take special care to note
5515 whether fclose returns an error, since the pages might still be on the
5516 buffer chain while the file is open. */
5518 if (asm_out_file)
5520 if (ferror (asm_out_file) != 0)
5521 fatal_io_error ("error writing to %s", asm_file_name);
5522 if (fclose (asm_out_file) != 0)
5523 fatal_io_error ("error closing %s", asm_file_name);
5526 /* Do whatever is necessary to finish printing the graphs. */
5527 if (graph_dump_format != no_graph)
5529 int i;
5531 for (i = 0; i < (int) DFI_MAX; ++i)
5532 if (dump_file[i].initialized && dump_file[i].graph_dump_p)
5534 char seq[16];
5535 char *suffix;
5537 sprintf (seq, DUMPFILE_FORMAT, i);
5538 suffix = concat (seq, dump_file[i].extension, NULL);
5539 finish_graph_dump_file (dump_base_name, suffix);
5540 free (suffix);
5544 if (mem_report)
5546 ggc_print_statistics ();
5547 stringpool_statistics ();
5548 dump_tree_statistics ();
5551 /* Free up memory for the benefit of leak detectors. */
5552 free_reg_info ();
5554 /* Language-specific end of compilation actions. */
5555 (*lang_hooks.finish) ();
5558 /* Initialize the compiler, and compile the input file. */
5559 static void
5560 do_compile ()
5562 /* Initialize timing first. The C front ends read the main file in
5563 the post_options hook, and C++ does file timings. */
5564 if (time_report || !quiet_flag || flag_detailed_statistics)
5565 timevar_init ();
5566 timevar_start (TV_TOTAL);
5568 process_options ();
5570 /* Don't do any more if an error has already occurred. */
5571 if (!errorcount)
5573 /* Set up the back-end if requested. */
5574 if (!no_backend)
5575 backend_init ();
5577 /* Language-dependent initialization. Returns true on success. */
5578 if (lang_dependent_init (filename))
5579 compile_file ();
5581 finalize ();
5584 /* Stop timing and print the times. */
5585 timevar_stop (TV_TOTAL);
5586 timevar_print (stderr);
5589 /* Entry point of cc1, cc1plus, jc1, f771, etc.
5590 Decode command args, then call compile_file.
5591 Exit code is FATAL_EXIT_CODE if can't open files or if there were
5592 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
5594 It is not safe to call this function more than once. */
5597 toplev_main (argc, argv)
5598 int argc;
5599 char **argv;
5601 /* Initialization of GCC's environment, and diagnostics. */
5602 general_init (argv[0]);
5604 /* Parse the options and do minimal processing; basically just
5605 enough to default flags appropriately. */
5606 parse_options_and_default_flags (argc, argv);
5608 /* Exit early if we can (e.g. -help). */
5609 if (!exit_after_options)
5610 do_compile ();
5612 if (errorcount || sorrycount)
5613 return (FATAL_EXIT_CODE);
5615 return (SUCCESS_EXIT_CODE);