* c-c++-common/ubsan/float-cast-overflow-6.c: Add i?86-*-* target.
[official-gcc.git] / gcc / toplev.c
blobeb37bfe6395eea58511c4038a21973c7cc8d4151
1 /* Top level of GCC compilers (cc1, cc1plus, etc.)
2 Copyright (C) 1987-2014 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
9 version.
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 for more details.
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /* This is the top level of cc1/c++.
21 It parses command args, opens files, invokes the various passes
22 in the proper order, and counts the time used by each.
23 Error messages and low-level interface to malloc also handled here. */
25 #include "config.h"
26 #include "system.h"
27 #include "coretypes.h"
28 #include "tm.h"
29 #include "line-map.h"
30 #include "input.h"
31 #include "tree.h"
32 #include "varasm.h"
33 #include "tree-inline.h"
34 #include "realmpfr.h" /* For GMP/MPFR/MPC versions, in print_version. */
35 #include "version.h"
36 #include "rtl.h"
37 #include "tm_p.h"
38 #include "flags.h"
39 #include "insn-attr.h"
40 #include "insn-config.h"
41 #include "insn-flags.h"
42 #include "hard-reg-set.h"
43 #include "recog.h"
44 #include "output.h"
45 #include "except.h"
46 #include "hashtab.h"
47 #include "hash-set.h"
48 #include "vec.h"
49 #include "machmode.h"
50 #include "function.h"
51 #include "toplev.h"
52 #include "expr.h"
53 #include "intl.h"
54 #include "regs.h"
55 #include "timevar.h"
56 #include "diagnostic.h"
57 #include "tree-diagnostic.h"
58 #include "tree-pretty-print.h"
59 #include "params.h"
60 #include "reload.h"
61 #include "ira.h"
62 #include "lra.h"
63 #include "dwarf2asm.h"
64 #include "debug.h"
65 #include "target.h"
66 #include "common/common-target.h"
67 #include "langhooks.h"
68 #include "cfgloop.h" /* for init_set_costs */
69 #include "hosthooks.h"
70 #include "predict.h"
71 #include "basic-block.h"
72 #include "hash-map.h"
73 #include "is-a.h"
74 #include "plugin-api.h"
75 #include "ipa-ref.h"
76 #include "cgraph.h"
77 #include "opts.h"
78 #include "opts-diagnostic.h"
79 #include "coverage.h"
80 #include "value-prof.h"
81 #include "alloc-pool.h"
82 #include "asan.h"
83 #include "tsan.h"
84 #include "tree-ssa-alias.h"
85 #include "internal-fn.h"
86 #include "gimple-expr.h"
87 #include "gimple.h"
88 #include "plugin.h"
89 #include "diagnostic-color.h"
90 #include "context.h"
91 #include "pass_manager.h"
92 #include "auto-profile.h"
93 #include "dwarf2out.h"
94 #include "bitmap.h"
95 #include "ipa-reference.h"
96 #include "ipa-prop.h"
97 #include "gcse.h"
98 #include "insn-codes.h"
99 #include "optabs.h"
101 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
102 #include "dbxout.h"
103 #endif
105 #ifdef SDB_DEBUGGING_INFO
106 #include "sdbout.h"
107 #endif
109 #ifdef XCOFF_DEBUGGING_INFO
110 #include "xcoffout.h" /* Needed for external data
111 declarations for e.g. AIX 4.x. */
112 #endif
114 #include <new>
116 static void general_init (const char *);
117 static void do_compile ();
118 static void process_options (void);
119 static void backend_init (void);
120 static int lang_dependent_init (const char *);
121 static void init_asm_output (const char *);
122 static void finalize (bool);
124 static void crash_signal (int) ATTRIBUTE_NORETURN;
125 static void compile_file (void);
127 /* True if we don't need a backend (e.g. preprocessing only). */
128 static bool no_backend;
130 /* Length of line when printing switch values. */
131 #define MAX_LINE 75
133 /* Decoded options, and number of such options. */
134 struct cl_decoded_option *save_decoded_options;
135 unsigned int save_decoded_options_count;
137 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
138 to optimize in process_options (). */
139 #define AUTODETECT_VALUE 2
141 /* Debug hooks - dependent upon command line options. */
143 const struct gcc_debug_hooks *debug_hooks;
145 /* The FUNCTION_DECL for the function currently being compiled,
146 or 0 if between functions. */
147 tree current_function_decl;
149 /* Set to the FUNC_BEGIN label of the current function, or NULL
150 if none. */
151 const char * current_function_func_begin_label;
153 /* A random sequence of characters, unless overridden by user. */
154 static const char *flag_random_seed;
156 /* A local time stamp derived from the time of compilation. It will be
157 zero if the system cannot provide a time. It will be -1u, if the
158 user has specified a particular random seed. */
159 unsigned local_tick;
161 /* Random number for this compilation */
162 HOST_WIDE_INT random_seed;
164 /* -f flags. */
166 /* When non-NULL, indicates that whenever space is allocated on the
167 stack, the resulting stack pointer must not pass this
168 address---that is, for stacks that grow downward, the stack pointer
169 must always be greater than or equal to this address; for stacks
170 that grow upward, the stack pointer must be less than this address.
171 At present, the rtx may be either a REG or a SYMBOL_REF, although
172 the support provided depends on the backend. */
173 rtx stack_limit_rtx;
175 /* True if the user has tagged the function with the 'section'
176 attribute. */
178 bool user_defined_section_attribute = false;
180 struct target_flag_state default_target_flag_state;
181 #if SWITCHABLE_TARGET
182 struct target_flag_state *this_target_flag_state = &default_target_flag_state;
183 #else
184 #define this_target_flag_state (&default_target_flag_state)
185 #endif
187 /* The user symbol prefix after having resolved same. */
188 const char *user_label_prefix;
190 /* Output files for assembler code (real compiler output)
191 and debugging dumps. */
193 FILE *asm_out_file;
194 FILE *aux_info_file;
195 FILE *stack_usage_file = NULL;
197 /* The current working directory of a translation. It's generally the
198 directory from which compilation was initiated, but a preprocessed
199 file may specify the original directory in which it was
200 created. */
202 static const char *src_pwd;
204 /* Initialize src_pwd with the given string, and return true. If it
205 was already initialized, return false. As a special case, it may
206 be called with a NULL argument to test whether src_pwd has NOT been
207 initialized yet. */
209 bool
210 set_src_pwd (const char *pwd)
212 if (src_pwd)
214 if (strcmp (src_pwd, pwd) == 0)
215 return true;
216 else
217 return false;
220 src_pwd = xstrdup (pwd);
221 return true;
224 /* Return the directory from which the translation unit was initiated,
225 in case set_src_pwd() was not called before to assign it a
226 different value. */
228 const char *
229 get_src_pwd (void)
231 if (! src_pwd)
233 src_pwd = getpwd ();
234 if (!src_pwd)
235 src_pwd = ".";
238 return src_pwd;
241 /* Called when the start of a function definition is parsed,
242 this function prints on stderr the name of the function. */
243 void
244 announce_function (tree decl)
246 if (!quiet_flag)
248 if (rtl_dump_and_exit)
249 fprintf (stderr, "%s ",
250 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl))));
251 else
252 fprintf (stderr, " %s",
253 identifier_to_locale (lang_hooks.decl_printable_name (decl, 2)));
254 fflush (stderr);
255 pp_needs_newline (global_dc->printer) = true;
256 diagnostic_set_last_function (global_dc, (diagnostic_info *) NULL);
260 /* Initialize local_tick with a random number or -1 if
261 flag_random_seed is set. */
263 static void
264 init_local_tick (void)
266 if (!flag_random_seed)
268 /* Try urandom first. Time of day is too likely to collide.
269 In case of any error we just use the local tick. */
271 int fd = open ("/dev/urandom", O_RDONLY);
272 if (fd >= 0)
274 read (fd, &random_seed, sizeof (random_seed));
275 close (fd);
278 /* Now get the tick anyways */
279 #ifdef HAVE_GETTIMEOFDAY
281 struct timeval tv;
283 gettimeofday (&tv, NULL);
284 local_tick = (unsigned) tv.tv_sec * 1000 + tv.tv_usec / 1000;
286 #else
288 time_t now = time (NULL);
290 if (now != (time_t)-1)
291 local_tick = (unsigned) now;
293 #endif
295 else
296 local_tick = -1;
299 /* Set up a default flag_random_seed and local_tick, unless the user
300 already specified one. Must be called after init_local_tick. */
302 static void
303 init_random_seed (void)
305 if (!random_seed)
306 random_seed = local_tick ^ getpid (); /* Old racey fallback method */
309 /* Obtain the random_seed. Unless NOINIT, initialize it if
310 it's not provided in the command line. */
312 HOST_WIDE_INT
313 get_random_seed (bool noinit)
315 if (!flag_random_seed && !noinit)
316 init_random_seed ();
317 return random_seed;
320 /* Modify the random_seed string to VAL. Return its previous
321 value. */
323 const char *
324 set_random_seed (const char *val)
326 const char *old = flag_random_seed;
327 flag_random_seed = val;
328 if (flag_random_seed)
330 char *endp;
332 /* When the driver passed in a hex number don't crc it again */
333 random_seed = strtoul (flag_random_seed, &endp, 0);
334 if (!(endp > flag_random_seed && *endp == 0))
335 random_seed = crc32_string (0, flag_random_seed);
337 return old;
340 /* Handler for fatal signals, such as SIGSEGV. These are transformed
341 into ICE messages, which is much more user friendly. In case the
342 error printer crashes, reset the signal to prevent infinite recursion. */
344 static void
345 crash_signal (int signo)
347 signal (signo, SIG_DFL);
349 /* If we crashed while processing an ASM statement, then be a little more
350 graceful. It's most likely the user's fault. */
351 if (this_is_asm_operands)
353 output_operand_lossage ("unrecoverable error");
354 exit (FATAL_EXIT_CODE);
357 internal_error ("%s", strsignal (signo));
360 /* A subroutine of wrapup_global_declarations. We've come to the end of
361 the compilation unit. All deferred variables should be undeferred,
362 and all incomplete decls should be finalized. */
364 void
365 wrapup_global_declaration_1 (tree decl)
367 /* We're not deferring this any longer. Assignment is conditional to
368 avoid needlessly dirtying PCH pages. */
369 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl), TS_DECL_WITH_VIS)
370 && DECL_DEFER_OUTPUT (decl) != 0)
371 DECL_DEFER_OUTPUT (decl) = 0;
373 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
374 lang_hooks.finish_incomplete_decl (decl);
377 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
378 needs to be output. Return true if it is output. */
380 bool
381 wrapup_global_declaration_2 (tree decl)
383 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl)
384 || (TREE_CODE (decl) == VAR_DECL && DECL_HAS_VALUE_EXPR_P (decl)))
385 return false;
387 /* Don't write out static consts, unless we still need them.
389 We also keep static consts if not optimizing (for debugging),
390 unless the user specified -fno-keep-static-consts.
391 ??? They might be better written into the debug information.
392 This is possible when using DWARF.
394 A language processor that wants static constants to be always
395 written out (even if it is not used) is responsible for
396 calling rest_of_decl_compilation itself. E.g. the C front-end
397 calls rest_of_decl_compilation from finish_decl.
398 One motivation for this is that is conventional in some
399 environments to write things like:
400 static const char rcsid[] = "... version string ...";
401 intending to force the string to be in the executable.
403 A language processor that would prefer to have unneeded
404 static constants "optimized away" would just defer writing
405 them out until here. E.g. C++ does this, because static
406 constants are often defined in header files.
408 ??? A tempting alternative (for both C and C++) would be
409 to force a constant to be written if and only if it is
410 defined in a main file, as opposed to an include file. */
412 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
414 varpool_node *node;
415 bool needed = true;
416 node = varpool_node::get (decl);
418 if (!node && flag_ltrans)
419 needed = false;
420 else if (node && node->definition)
421 needed = false;
422 else if (node && node->alias)
423 needed = false;
424 else if (!symtab->global_info_ready
425 && (TREE_USED (decl)
426 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
427 /* needed */;
428 else if (node && node->analyzed)
429 /* needed */;
430 else if (DECL_COMDAT (decl))
431 needed = false;
432 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
433 && (optimize || !flag_keep_static_consts
434 || DECL_ARTIFICIAL (decl)))
435 needed = false;
437 if (needed)
439 rest_of_decl_compilation (decl, 1, 1);
440 return true;
444 return false;
447 /* Do any final processing required for the declarations in VEC, of
448 which there are LEN. We write out inline functions and variables
449 that have been deferred until this point, but which are required.
450 Returns nonzero if anything was put out. */
452 bool
453 wrapup_global_declarations (tree *vec, int len)
455 bool reconsider, output_something = false;
456 int i;
458 for (i = 0; i < len; i++)
459 wrapup_global_declaration_1 (vec[i]);
461 /* Now emit any global variables or functions that we have been
462 putting off. We need to loop in case one of the things emitted
463 here references another one which comes earlier in the list. */
466 reconsider = false;
467 for (i = 0; i < len; i++)
468 reconsider |= wrapup_global_declaration_2 (vec[i]);
469 if (reconsider)
470 output_something = true;
472 while (reconsider);
474 return output_something;
477 /* A subroutine of check_global_declarations. Issue appropriate warnings
478 for the global declaration DECL. */
480 void
481 check_global_declaration_1 (tree decl)
483 /* Warn about any function declared static but not defined. We don't
484 warn about variables, because many programs have static variables
485 that exist only to get some text into the object file. */
486 if (TREE_CODE (decl) == FUNCTION_DECL
487 && DECL_INITIAL (decl) == 0
488 && DECL_EXTERNAL (decl)
489 && ! DECL_ARTIFICIAL (decl)
490 && ! TREE_NO_WARNING (decl)
491 && ! TREE_PUBLIC (decl)
492 && (warn_unused_function
493 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
495 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
496 pedwarn (input_location, 0, "%q+F used but never defined", decl);
497 else
498 warning (OPT_Wunused_function, "%q+F declared %<static%> but never defined", decl);
499 /* This symbol is effectively an "extern" declaration now. */
500 TREE_PUBLIC (decl) = 1;
503 /* Warn about static fns or vars defined but not used. */
504 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
505 /* We don't warn about "static const" variables because the
506 "rcs_id" idiom uses that construction. */
507 || (warn_unused_variable
508 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
509 && ! DECL_IN_SYSTEM_HEADER (decl)
510 && ! TREE_USED (decl)
511 /* The TREE_USED bit for file-scope decls is kept in the identifier,
512 to handle multiple external decls in different scopes. */
513 && ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl)))
514 && ! DECL_EXTERNAL (decl)
515 && ! TREE_PUBLIC (decl)
516 /* A volatile variable might be used in some non-obvious way. */
517 && ! TREE_THIS_VOLATILE (decl)
518 /* Global register variables must be declared to reserve them. */
519 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
520 /* Otherwise, ask the language. */
521 && lang_hooks.decls.warn_unused_global (decl))
522 warning ((TREE_CODE (decl) == FUNCTION_DECL)
523 ? OPT_Wunused_function
524 : OPT_Wunused_variable,
525 "%q+D defined but not used", decl);
528 /* Issue appropriate warnings for the global declarations in V (of
529 which there are LEN). */
531 void
532 check_global_declarations (tree *v, int len)
534 int i;
536 for (i = 0; i < len; i++)
537 check_global_declaration_1 (v[i]);
540 /* Emit debugging information for all global declarations in VEC. */
542 void
543 emit_debug_global_declarations (tree *vec, int len)
545 int i;
547 /* Avoid confusing the debug information machinery when there are errors. */
548 if (seen_error ())
549 return;
551 timevar_push (TV_SYMOUT);
552 for (i = 0; i < len; i++)
553 debug_hooks->global_decl (vec[i]);
554 timevar_pop (TV_SYMOUT);
557 /* Compile an entire translation unit. Write a file of assembly
558 output and various debugging dumps. */
560 static void
561 compile_file (void)
563 timevar_start (TV_PHASE_PARSING);
564 timevar_push (TV_PARSE_GLOBAL);
566 /* Call the parser, which parses the entire file (calling
567 rest_of_compilation for each function). */
568 lang_hooks.parse_file ();
570 timevar_pop (TV_PARSE_GLOBAL);
571 timevar_stop (TV_PHASE_PARSING);
573 /* Compilation is now finished except for writing
574 what's left of the symbol table output. */
576 if (flag_syntax_only || flag_wpa)
577 return;
579 ggc_protect_identifiers = false;
581 /* This must also call finalize_compilation_unit. */
582 lang_hooks.decls.final_write_globals ();
584 if (seen_error ())
585 return;
587 timevar_start (TV_PHASE_LATE_ASM);
589 /* Compilation unit is finalized. When producing non-fat LTO object, we are
590 basically finished. */
591 if (in_lto_p || !flag_lto || flag_fat_lto_objects)
593 /* File-scope initialization for AddressSanitizer. */
594 if (flag_sanitize & SANITIZE_ADDRESS)
595 asan_finish_file ();
597 if (flag_sanitize & SANITIZE_THREAD)
598 tsan_finish_file ();
600 output_shared_constant_pool ();
601 output_object_blocks ();
602 finish_tm_clone_pairs ();
604 /* Write out any pending weak symbol declarations. */
605 weak_finish ();
607 /* This must be at the end before unwind and debug info.
608 Some target ports emit PIC setup thunks here. */
609 targetm.asm_out.code_end ();
611 /* Do dbx symbols. */
612 timevar_push (TV_SYMOUT);
614 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
615 if (dwarf2out_do_frame ())
616 dwarf2out_frame_finish ();
617 #endif
619 (*debug_hooks->finish) (main_input_filename);
620 timevar_pop (TV_SYMOUT);
622 /* Output some stuff at end of file if nec. */
624 dw2_output_indirect_constants ();
626 /* Flush any pending external directives. */
627 process_pending_assemble_externals ();
630 /* Emit LTO marker if LTO info has been previously emitted. This is
631 used by collect2 to determine whether an object file contains IL.
632 We used to emit an undefined reference here, but this produces
633 link errors if an object file with IL is stored into a shared
634 library without invoking lto1. */
635 if (flag_generate_lto)
637 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
638 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
639 "__gnu_lto_v1",
640 (unsigned HOST_WIDE_INT) 1, 8);
641 #elif defined ASM_OUTPUT_ALIGNED_COMMON
642 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_v1",
643 (unsigned HOST_WIDE_INT) 1, 8);
644 #else
645 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_v1",
646 (unsigned HOST_WIDE_INT) 1,
647 (unsigned HOST_WIDE_INT) 1);
648 #endif
649 /* Let linker plugin know that this is a slim object and must be LTOed
650 even when user did not ask for it. */
651 if (!flag_fat_lto_objects)
653 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
654 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
655 "__gnu_lto_slim",
656 (unsigned HOST_WIDE_INT) 1, 8);
657 #elif defined ASM_OUTPUT_ALIGNED_COMMON
658 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_slim",
659 (unsigned HOST_WIDE_INT) 1, 8);
660 #else
661 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_slim",
662 (unsigned HOST_WIDE_INT) 1,
663 (unsigned HOST_WIDE_INT) 1);
664 #endif
668 /* Attach a special .ident directive to the end of the file to identify
669 the version of GCC which compiled this code. The format of the .ident
670 string is patterned after the ones produced by native SVR4 compilers. */
671 if (!flag_no_ident)
673 const char *pkg_version = "(GNU) ";
674 char *ident_str;
676 if (strcmp ("(GCC) ", pkgversion_string))
677 pkg_version = pkgversion_string;
679 ident_str = ACONCAT (("GCC: ", pkg_version, version_string, NULL));
680 targetm.asm_out.output_ident (ident_str);
683 /* Auto profile finalization. */
684 if (flag_auto_profile)
685 end_auto_profile ();
687 /* Invoke registered plugin callbacks. */
688 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT, NULL);
690 /* This must be at the end. Some target ports emit end of file directives
691 into the assembly file here, and hence we can not output anything to the
692 assembly file after this point. */
693 targetm.asm_out.file_end ();
695 timevar_stop (TV_PHASE_LATE_ASM);
698 /* Print version information to FILE.
699 Each line begins with INDENT (for the case where FILE is the
700 assembler output file). */
702 void
703 print_version (FILE *file, const char *indent)
705 static const char fmt1[] =
706 #ifdef __GNUC__
707 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
708 #else
709 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
710 #endif
712 static const char fmt2[] =
713 N_("GMP version %s, MPFR version %s, MPC version %s\n");
714 static const char fmt3[] =
715 N_("%s%swarning: %s header version %s differs from library version %s.\n");
716 static const char fmt4[] =
717 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
718 #ifndef __VERSION__
719 #define __VERSION__ "[?]"
720 #endif
721 fprintf (file,
722 file == stderr ? _(fmt1) : fmt1,
723 indent, *indent != 0 ? " " : "",
724 lang_hooks.name, pkgversion_string, version_string, TARGET_NAME,
725 indent, __VERSION__);
727 /* We need to stringify the GMP macro values. Ugh, gmp_version has
728 two string formats, "i.j.k" and "i.j" when k is zero. As of
729 gmp-4.3.0, GMP always uses the 3 number format. */
730 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
731 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3 (X)
732 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
733 #define GCC_GMP_VERSION \
734 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
735 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
736 #define GCC_GMP_STRINGIFY_VERSION \
737 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
738 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR)
739 #else
740 #define GCC_GMP_STRINGIFY_VERSION \
741 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
742 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR) "." \
743 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_PATCHLEVEL)
744 #endif
745 fprintf (file,
746 file == stderr ? _(fmt2) : fmt2,
747 GCC_GMP_STRINGIFY_VERSION, MPFR_VERSION_STRING, MPC_VERSION_STRING);
748 if (strcmp (GCC_GMP_STRINGIFY_VERSION, gmp_version))
749 fprintf (file,
750 file == stderr ? _(fmt3) : fmt3,
751 indent, *indent != 0 ? " " : "",
752 "GMP", GCC_GMP_STRINGIFY_VERSION, gmp_version);
753 if (strcmp (MPFR_VERSION_STRING, mpfr_get_version ()))
754 fprintf (file,
755 file == stderr ? _(fmt3) : fmt3,
756 indent, *indent != 0 ? " " : "",
757 "MPFR", MPFR_VERSION_STRING, mpfr_get_version ());
758 if (strcmp (MPC_VERSION_STRING, mpc_get_version ()))
759 fprintf (file,
760 file == stderr ? _(fmt3) : fmt3,
761 indent, *indent != 0 ? " " : "",
762 "MPC", MPC_VERSION_STRING, mpc_get_version ());
763 fprintf (file,
764 file == stderr ? _(fmt4) : fmt4,
765 indent, *indent != 0 ? " " : "",
766 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
768 print_plugins_versions (file, indent);
771 static int
772 print_to_asm_out_file (print_switch_type type, const char * text)
774 bool prepend_sep = true;
776 switch (type)
778 case SWITCH_TYPE_LINE_END:
779 putc ('\n', asm_out_file);
780 return 1;
782 case SWITCH_TYPE_LINE_START:
783 fputs (ASM_COMMENT_START, asm_out_file);
784 return strlen (ASM_COMMENT_START);
786 case SWITCH_TYPE_DESCRIPTIVE:
787 if (ASM_COMMENT_START[0] == 0)
788 prepend_sep = false;
789 /* Drop through. */
790 case SWITCH_TYPE_PASSED:
791 case SWITCH_TYPE_ENABLED:
792 if (prepend_sep)
793 fputc (' ', asm_out_file);
794 fputs (text, asm_out_file);
795 /* No need to return the length here as
796 print_single_switch has already done it. */
797 return 0;
799 default:
800 return -1;
804 static int
805 print_to_stderr (print_switch_type type, const char * text)
807 switch (type)
809 case SWITCH_TYPE_LINE_END:
810 putc ('\n', stderr);
811 return 1;
813 case SWITCH_TYPE_LINE_START:
814 return 0;
816 case SWITCH_TYPE_PASSED:
817 case SWITCH_TYPE_ENABLED:
818 fputc (' ', stderr);
819 /* Drop through. */
821 case SWITCH_TYPE_DESCRIPTIVE:
822 fputs (text, stderr);
823 /* No need to return the length here as
824 print_single_switch has already done it. */
825 return 0;
827 default:
828 return -1;
832 /* Print an option value and return the adjusted position in the line.
833 ??? print_fn doesn't handle errors, eg disk full; presumably other
834 code will catch a disk full though. */
836 static int
837 print_single_switch (print_switch_fn_type print_fn,
838 int pos,
839 print_switch_type type,
840 const char * text)
842 /* The ultrix fprintf returns 0 on success, so compute the result
843 we want here since we need it for the following test. The +1
844 is for the separator character that will probably be emitted. */
845 int len = strlen (text) + 1;
847 if (pos != 0
848 && pos + len > MAX_LINE)
850 print_fn (SWITCH_TYPE_LINE_END, NULL);
851 pos = 0;
854 if (pos == 0)
855 pos += print_fn (SWITCH_TYPE_LINE_START, NULL);
857 print_fn (type, text);
858 return pos + len;
861 /* Print active target switches using PRINT_FN.
862 POS is the current cursor position and MAX is the size of a "line".
863 Each line begins with INDENT and ends with TERM.
864 Each switch is separated from the next by SEP. */
866 static void
867 print_switch_values (print_switch_fn_type print_fn)
869 int pos = 0;
870 size_t j;
872 /* Fill in the -frandom-seed option, if the user didn't pass it, so
873 that it can be printed below. This helps reproducibility. */
874 if (!flag_random_seed)
875 init_random_seed ();
877 /* Print the options as passed. */
878 pos = print_single_switch (print_fn, pos,
879 SWITCH_TYPE_DESCRIPTIVE, _("options passed: "));
881 for (j = 1; j < save_decoded_options_count; j++)
883 switch (save_decoded_options[j].opt_index)
885 case OPT_o:
886 case OPT_d:
887 case OPT_dumpbase:
888 case OPT_dumpdir:
889 case OPT_auxbase:
890 case OPT_quiet:
891 case OPT_version:
892 /* Ignore these. */
893 continue;
896 pos = print_single_switch (print_fn, pos, SWITCH_TYPE_PASSED,
897 save_decoded_options[j].orig_option_with_args_text);
900 if (pos > 0)
901 print_fn (SWITCH_TYPE_LINE_END, NULL);
903 /* Print the -f and -m options that have been enabled.
904 We don't handle language specific options but printing argv
905 should suffice. */
906 pos = print_single_switch (print_fn, 0,
907 SWITCH_TYPE_DESCRIPTIVE, _("options enabled: "));
909 for (j = 0; j < cl_options_count; j++)
910 if (cl_options[j].cl_report
911 && option_enabled (j, &global_options) > 0)
912 pos = print_single_switch (print_fn, pos,
913 SWITCH_TYPE_ENABLED, cl_options[j].opt_text);
915 print_fn (SWITCH_TYPE_LINE_END, NULL);
918 /* Open assembly code output file. Do this even if -fsyntax-only is
919 on, because then the driver will have provided the name of a
920 temporary file or bit bucket for us. NAME is the file specified on
921 the command line, possibly NULL. */
922 static void
923 init_asm_output (const char *name)
925 if (name == NULL && asm_file_name == 0)
926 asm_out_file = stdout;
927 else
929 if (asm_file_name == 0)
931 int len = strlen (dump_base_name);
932 char *dumpname = XNEWVEC (char, len + 6);
934 memcpy (dumpname, dump_base_name, len + 1);
935 strip_off_ending (dumpname, len);
936 strcat (dumpname, ".s");
937 asm_file_name = dumpname;
939 if (!strcmp (asm_file_name, "-"))
940 asm_out_file = stdout;
941 else
942 asm_out_file = fopen (asm_file_name, "w");
943 if (asm_out_file == 0)
944 fatal_error ("can%'t open %s for writing: %m", asm_file_name);
947 if (!flag_syntax_only)
949 targetm.asm_out.file_start ();
951 if (flag_record_gcc_switches)
953 if (targetm.asm_out.record_gcc_switches)
955 /* Let the target know that we are about to start recording. */
956 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
957 NULL);
958 /* Now record the switches. */
959 print_switch_values (targetm.asm_out.record_gcc_switches);
960 /* Let the target know that the recording is over. */
961 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
962 NULL);
964 else
965 inform (input_location, "-frecord-gcc-switches is not supported by the current target");
968 if (flag_verbose_asm)
970 /* Print the list of switches in effect
971 into the assembler file as comments. */
972 print_version (asm_out_file, ASM_COMMENT_START);
973 print_switch_values (print_to_asm_out_file);
974 putc ('\n', asm_out_file);
979 /* A helper function; used as the reallocator function for cpp's line
980 table. */
981 static void *
982 realloc_for_line_map (void *ptr, size_t len)
984 return ggc_realloc (ptr, len);
987 /* A helper function: used as the allocator function for
988 identifier_to_locale. */
989 static void *
990 alloc_for_identifier_to_locale (size_t len)
992 return ggc_alloc_atomic (len);
995 /* Output stack usage information. */
996 void
997 output_stack_usage (void)
999 static bool warning_issued = false;
1000 enum stack_usage_kind_type { STATIC = 0, DYNAMIC, DYNAMIC_BOUNDED };
1001 const char *stack_usage_kind_str[] = {
1002 "static",
1003 "dynamic",
1004 "dynamic,bounded"
1006 HOST_WIDE_INT stack_usage = current_function_static_stack_size;
1007 enum stack_usage_kind_type stack_usage_kind;
1009 if (stack_usage < 0)
1011 if (!warning_issued)
1013 warning (0, "stack usage computation not supported for this target");
1014 warning_issued = true;
1016 return;
1019 stack_usage_kind = STATIC;
1021 /* Add the maximum amount of space pushed onto the stack. */
1022 if (current_function_pushed_stack_size > 0)
1024 stack_usage += current_function_pushed_stack_size;
1025 stack_usage_kind = DYNAMIC_BOUNDED;
1028 /* Now on to the tricky part: dynamic stack allocation. */
1029 if (current_function_allocates_dynamic_stack_space)
1031 if (current_function_has_unbounded_dynamic_stack_size)
1032 stack_usage_kind = DYNAMIC;
1033 else
1034 stack_usage_kind = DYNAMIC_BOUNDED;
1036 /* Add the size even in the unbounded case, this can't hurt. */
1037 stack_usage += current_function_dynamic_stack_size;
1040 if (flag_stack_usage)
1042 expanded_location loc
1043 = expand_location (DECL_SOURCE_LOCATION (current_function_decl));
1044 /* We don't want to print the full qualified name because it can be long,
1045 so we strip the scope prefix, but we may need to deal with the suffix
1046 created by the compiler. */
1047 const char *suffix
1048 = strchr (IDENTIFIER_POINTER (DECL_NAME (current_function_decl)), '.');
1049 const char *name
1050 = lang_hooks.decl_printable_name (current_function_decl, 2);
1051 if (suffix)
1053 const char *dot = strchr (name, '.');
1054 while (dot && strcasecmp (dot, suffix) != 0)
1056 name = dot + 1;
1057 dot = strchr (name, '.');
1060 else
1062 const char *dot = strrchr (name, '.');
1063 if (dot)
1064 name = dot + 1;
1067 fprintf (stack_usage_file,
1068 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC"\t%s\n",
1069 lbasename (loc.file),
1070 loc.line,
1071 loc.column,
1072 name,
1073 stack_usage,
1074 stack_usage_kind_str[stack_usage_kind]);
1077 if (warn_stack_usage >= 0)
1079 const location_t loc = DECL_SOURCE_LOCATION (current_function_decl);
1081 if (stack_usage_kind == DYNAMIC)
1082 warning_at (loc, OPT_Wstack_usage_, "stack usage might be unbounded");
1083 else if (stack_usage > warn_stack_usage)
1085 if (stack_usage_kind == DYNAMIC_BOUNDED)
1086 warning_at (loc,
1087 OPT_Wstack_usage_, "stack usage might be %wd bytes",
1088 stack_usage);
1089 else
1090 warning_at (loc, OPT_Wstack_usage_, "stack usage is %wd bytes",
1091 stack_usage);
1096 /* Open an auxiliary output file. */
1097 static FILE *
1098 open_auxiliary_file (const char *ext)
1100 char *filename;
1101 FILE *file;
1103 filename = concat (aux_base_name, ".", ext, NULL);
1104 file = fopen (filename, "w");
1105 if (!file)
1106 fatal_error ("can%'t open %s for writing: %m", filename);
1107 free (filename);
1108 return file;
1111 /* Initialization of the front end environment, before command line
1112 options are parsed. Signal handlers, internationalization etc.
1113 ARGV0 is main's argv[0]. */
1114 static void
1115 general_init (const char *argv0)
1117 const char *p;
1119 p = argv0 + strlen (argv0);
1120 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1121 --p;
1122 progname = p;
1124 xmalloc_set_program_name (progname);
1126 hex_init ();
1128 /* Unlock the stdio streams. */
1129 unlock_std_streams ();
1131 gcc_init_libintl ();
1133 identifier_to_locale_alloc = alloc_for_identifier_to_locale;
1134 identifier_to_locale_free = ggc_free;
1136 /* Initialize the diagnostics reporting machinery, so option parsing
1137 can give warnings and errors. */
1138 diagnostic_initialize (global_dc, N_OPTS);
1139 /* Set a default printer. Language specific initializations will
1140 override it later. */
1141 tree_diagnostics_defaults (global_dc);
1143 global_dc->show_caret
1144 = global_options_init.x_flag_diagnostics_show_caret;
1145 global_dc->show_option_requested
1146 = global_options_init.x_flag_diagnostics_show_option;
1147 global_dc->show_column
1148 = global_options_init.x_flag_show_column;
1149 global_dc->internal_error = plugins_internal_error_function;
1150 global_dc->option_enabled = option_enabled;
1151 global_dc->option_state = &global_options;
1152 global_dc->option_name = option_name;
1154 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1155 #ifdef SIGSEGV
1156 signal (SIGSEGV, crash_signal);
1157 #endif
1158 #ifdef SIGILL
1159 signal (SIGILL, crash_signal);
1160 #endif
1161 #ifdef SIGBUS
1162 signal (SIGBUS, crash_signal);
1163 #endif
1164 #ifdef SIGABRT
1165 signal (SIGABRT, crash_signal);
1166 #endif
1167 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1168 signal (SIGIOT, crash_signal);
1169 #endif
1170 #ifdef SIGFPE
1171 signal (SIGFPE, crash_signal);
1172 #endif
1174 /* Other host-specific signal setup. */
1175 (*host_hooks.extra_signals)();
1177 /* Initialize the garbage-collector, string pools and tree type hash
1178 table. */
1179 init_ggc ();
1180 init_stringpool ();
1181 input_location = UNKNOWN_LOCATION;
1182 line_table = ggc_alloc<line_maps> ();
1183 linemap_init (line_table, BUILTINS_LOCATION);
1184 line_table->reallocator = realloc_for_line_map;
1185 line_table->round_alloc_size = ggc_round_alloc_size;
1186 init_ttree ();
1188 /* Initialize register usage now so switches may override. */
1189 init_reg_sets ();
1191 /* Register the language-independent parameters. */
1192 global_init_params ();
1194 /* This must be done after global_init_params but before argument
1195 processing. */
1196 init_ggc_heuristics ();
1198 /* Create the singleton holder for global state.
1199 Doing so also creates the pass manager and with it the passes. */
1200 g = new gcc::context ();
1201 symtab = ggc_cleared_alloc <symbol_table> ();
1203 statistics_early_init ();
1204 finish_params ();
1207 /* Return true if the current target supports -fsection-anchors. */
1209 static bool
1210 target_supports_section_anchors_p (void)
1212 if (targetm.min_anchor_offset == 0 && targetm.max_anchor_offset == 0)
1213 return false;
1215 if (targetm.asm_out.output_anchor == NULL)
1216 return false;
1218 return true;
1221 /* Default the align_* variables to 1 if they're still unset, and
1222 set up the align_*_log variables. */
1223 static void
1224 init_alignments (void)
1226 if (align_loops <= 0)
1227 align_loops = 1;
1228 if (align_loops_max_skip > align_loops)
1229 align_loops_max_skip = align_loops - 1;
1230 align_loops_log = floor_log2 (align_loops * 2 - 1);
1231 if (align_jumps <= 0)
1232 align_jumps = 1;
1233 if (align_jumps_max_skip > align_jumps)
1234 align_jumps_max_skip = align_jumps - 1;
1235 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1236 if (align_labels <= 0)
1237 align_labels = 1;
1238 align_labels_log = floor_log2 (align_labels * 2 - 1);
1239 if (align_labels_max_skip > align_labels)
1240 align_labels_max_skip = align_labels - 1;
1241 if (align_functions <= 0)
1242 align_functions = 1;
1243 align_functions_log = floor_log2 (align_functions * 2 - 1);
1246 /* Process the options that have been parsed. */
1247 static void
1248 process_options (void)
1250 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1251 This can happen with incorrect pre-processed input. */
1252 debug_hooks = &do_nothing_debug_hooks;
1254 maximum_field_alignment = initial_max_fld_align * BITS_PER_UNIT;
1256 /* Default to -fdiagnostics-color=auto if GCC_COLORS is in the environment,
1257 otherwise default to -fdiagnostics-color=never. */
1258 if (!global_options_set.x_flag_diagnostics_show_color
1259 && getenv ("GCC_COLORS"))
1260 pp_show_color (global_dc->printer)
1261 = colorize_init (DIAGNOSTICS_COLOR_AUTO);
1263 /* Allow the front end to perform consistency checks and do further
1264 initialization based on the command line options. This hook also
1265 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1266 so we can correctly initialize debug output. */
1267 no_backend = lang_hooks.post_options (&main_input_filename);
1269 /* Some machines may reject certain combinations of options. */
1270 targetm.target_option.override ();
1272 /* Avoid any informative notes in the second run of -fcompare-debug. */
1273 if (flag_compare_debug)
1274 diagnostic_inhibit_notes (global_dc);
1276 if (flag_section_anchors && !target_supports_section_anchors_p ())
1278 warning (OPT_fsection_anchors,
1279 "this target does not support %qs", "-fsection-anchors");
1280 flag_section_anchors = 0;
1283 if (flag_short_enums == 2)
1284 flag_short_enums = targetm.default_short_enums ();
1286 /* Set aux_base_name if not already set. */
1287 if (aux_base_name)
1289 else if (main_input_filename)
1291 char *name = xstrdup (lbasename (main_input_filename));
1293 strip_off_ending (name, strlen (name));
1294 aux_base_name = name;
1296 else
1297 aux_base_name = "gccaux";
1299 #ifndef HAVE_isl
1300 if (flag_graphite
1301 || flag_graphite_identity
1302 || flag_loop_block
1303 || flag_loop_interchange
1304 || flag_loop_strip_mine
1305 || flag_loop_parallelize_all)
1306 sorry ("Graphite loop optimizations cannot be used (ISL is not available)"
1307 "(-fgraphite, -fgraphite-identity, -floop-block, "
1308 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1309 "and -ftree-loop-linear)");
1310 #endif
1312 /* One region RA really helps to decrease the code size. */
1313 if (flag_ira_region == IRA_REGION_AUTODETECT)
1314 flag_ira_region
1315 = optimize_size || !optimize ? IRA_REGION_ONE : IRA_REGION_MIXED;
1317 if (!abi_version_at_least (2))
1319 /* -fabi-version=1 support was removed after GCC 4.9. */
1320 error ("%<-fabi-version=1%> is no longer supported");
1321 flag_abi_version = 2;
1324 /* Unrolling all loops implies that standard loop unrolling must also
1325 be done. */
1326 if (flag_unroll_all_loops)
1327 flag_unroll_loops = 1;
1329 /* web and rename-registers help when run after loop unrolling. */
1330 if (flag_web == AUTODETECT_VALUE)
1331 flag_web = flag_unroll_loops || flag_peel_loops;
1333 if (flag_rename_registers == AUTODETECT_VALUE)
1334 flag_rename_registers = flag_unroll_loops || flag_peel_loops;
1336 if (flag_non_call_exceptions)
1337 flag_asynchronous_unwind_tables = 1;
1338 if (flag_asynchronous_unwind_tables)
1339 flag_unwind_tables = 1;
1341 if (flag_value_profile_transformations)
1342 flag_profile_values = 1;
1344 /* Warn about options that are not supported on this machine. */
1345 #ifndef INSN_SCHEDULING
1346 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1347 warning (0, "instruction scheduling not supported on this target machine");
1348 #endif
1349 #ifndef DELAY_SLOTS
1350 if (flag_delayed_branch)
1351 warning (0, "this target machine does not have delayed branches");
1352 #endif
1354 user_label_prefix = USER_LABEL_PREFIX;
1355 if (flag_leading_underscore != -1)
1357 /* If the default prefix is more complicated than "" or "_",
1358 issue a warning and ignore this option. */
1359 if (user_label_prefix[0] == 0 ||
1360 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1362 user_label_prefix = flag_leading_underscore ? "_" : "";
1364 else
1365 warning (0, "-f%sleading-underscore not supported on this target machine",
1366 flag_leading_underscore ? "" : "no-");
1369 /* If we are in verbose mode, write out the version and maybe all the
1370 option flags in use. */
1371 if (version_flag)
1373 print_version (stderr, "");
1374 if (! quiet_flag)
1375 print_switch_values (print_to_stderr);
1378 if (flag_syntax_only)
1380 write_symbols = NO_DEBUG;
1381 profile_flag = 0;
1384 if (flag_gtoggle)
1386 if (debug_info_level == DINFO_LEVEL_NONE)
1388 debug_info_level = DINFO_LEVEL_NORMAL;
1390 if (write_symbols == NO_DEBUG)
1391 write_symbols = PREFERRED_DEBUGGING_TYPE;
1393 else
1394 debug_info_level = DINFO_LEVEL_NONE;
1397 if (flag_dump_final_insns && !flag_syntax_only && !no_backend)
1399 FILE *final_output = fopen (flag_dump_final_insns, "w");
1400 if (!final_output)
1402 error ("could not open final insn dump file %qs: %m",
1403 flag_dump_final_insns);
1404 flag_dump_final_insns = NULL;
1406 else if (fclose (final_output))
1408 error ("could not close zeroed insn dump file %qs: %m",
1409 flag_dump_final_insns);
1410 flag_dump_final_insns = NULL;
1414 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1415 level is 0. */
1416 if (debug_info_level == DINFO_LEVEL_NONE)
1417 write_symbols = NO_DEBUG;
1419 if (write_symbols == NO_DEBUG)
1421 #if defined(DBX_DEBUGGING_INFO)
1422 else if (write_symbols == DBX_DEBUG)
1423 debug_hooks = &dbx_debug_hooks;
1424 #endif
1425 #if defined(XCOFF_DEBUGGING_INFO)
1426 else if (write_symbols == XCOFF_DEBUG)
1427 debug_hooks = &xcoff_debug_hooks;
1428 #endif
1429 #ifdef SDB_DEBUGGING_INFO
1430 else if (write_symbols == SDB_DEBUG)
1431 debug_hooks = &sdb_debug_hooks;
1432 #endif
1433 #ifdef DWARF2_DEBUGGING_INFO
1434 else if (write_symbols == DWARF2_DEBUG)
1435 debug_hooks = &dwarf2_debug_hooks;
1436 #endif
1437 #ifdef VMS_DEBUGGING_INFO
1438 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1439 debug_hooks = &vmsdbg_debug_hooks;
1440 #endif
1441 else
1442 error ("target system does not support the \"%s\" debug format",
1443 debug_type_names[write_symbols]);
1445 /* We know which debug output will be used so we can set flag_var_tracking
1446 and flag_var_tracking_uninit if the user has not specified them. */
1447 if (debug_info_level < DINFO_LEVEL_NORMAL
1448 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
1450 if (flag_var_tracking == 1
1451 || flag_var_tracking_uninit == 1)
1453 if (debug_info_level < DINFO_LEVEL_NORMAL)
1454 warning (0, "variable tracking requested, but useless unless "
1455 "producing debug info");
1456 else
1457 warning (0, "variable tracking requested, but not supported "
1458 "by this debug format");
1460 flag_var_tracking = 0;
1461 flag_var_tracking_uninit = 0;
1464 /* The debug hooks are used to implement -fdump-go-spec because it
1465 gives a simple and stable API for all the information we need to
1466 dump. */
1467 if (flag_dump_go_spec != NULL)
1468 debug_hooks = dump_go_spec_init (flag_dump_go_spec, debug_hooks);
1470 /* If the user specifically requested variable tracking with tagging
1471 uninitialized variables, we need to turn on variable tracking.
1472 (We already determined above that variable tracking is feasible.) */
1473 if (flag_var_tracking_uninit == 1)
1474 flag_var_tracking = 1;
1476 if (flag_var_tracking == AUTODETECT_VALUE)
1477 flag_var_tracking = optimize >= 1;
1479 if (flag_var_tracking_uninit == AUTODETECT_VALUE)
1480 flag_var_tracking_uninit = flag_var_tracking;
1482 if (flag_var_tracking_assignments == AUTODETECT_VALUE)
1483 flag_var_tracking_assignments = flag_var_tracking
1484 && !(flag_selective_scheduling || flag_selective_scheduling2);
1486 if (flag_var_tracking_assignments_toggle)
1487 flag_var_tracking_assignments = !flag_var_tracking_assignments;
1489 if (flag_var_tracking_assignments && !flag_var_tracking)
1490 flag_var_tracking = flag_var_tracking_assignments = -1;
1492 if (flag_var_tracking_assignments
1493 && (flag_selective_scheduling || flag_selective_scheduling2))
1494 warning (0, "var-tracking-assignments changes selective scheduling");
1496 if (flag_tree_cselim == AUTODETECT_VALUE)
1497 #ifdef HAVE_conditional_move
1498 flag_tree_cselim = 1;
1499 #else
1500 flag_tree_cselim = 0;
1501 #endif
1503 /* If auxiliary info generation is desired, open the output file.
1504 This goes in the same directory as the source file--unlike
1505 all the other output files. */
1506 if (flag_gen_aux_info)
1508 aux_info_file = fopen (aux_info_file_name, "w");
1509 if (aux_info_file == 0)
1510 fatal_error ("can%'t open %s: %m", aux_info_file_name);
1513 if (!targetm_common.have_named_sections)
1515 if (flag_function_sections)
1517 warning (0, "-ffunction-sections not supported for this target");
1518 flag_function_sections = 0;
1520 if (flag_data_sections)
1522 warning (0, "-fdata-sections not supported for this target");
1523 flag_data_sections = 0;
1527 #ifndef HAVE_prefetch
1528 if (flag_prefetch_loop_arrays > 0)
1530 warning (0, "-fprefetch-loop-arrays not supported for this target");
1531 flag_prefetch_loop_arrays = 0;
1533 #else
1534 if (flag_prefetch_loop_arrays > 0 && !HAVE_prefetch)
1536 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1537 flag_prefetch_loop_arrays = 0;
1539 #endif
1541 /* This combination of options isn't handled for i386 targets and doesn't
1542 make much sense anyway, so don't allow it. */
1543 if (flag_prefetch_loop_arrays > 0 && optimize_size)
1545 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1546 flag_prefetch_loop_arrays = 0;
1549 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1550 if (flag_signaling_nans)
1551 flag_trapping_math = 1;
1553 /* We cannot reassociate if we want traps or signed zeros. */
1554 if (flag_associative_math && (flag_trapping_math || flag_signed_zeros))
1556 warning (0, "-fassociative-math disabled; other options take precedence");
1557 flag_associative_math = 0;
1560 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1561 if (flag_cx_limited_range)
1562 flag_complex_method = 0;
1564 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1565 if (flag_cx_fortran_rules)
1566 flag_complex_method = 1;
1568 /* Targets must be able to place spill slots at lower addresses. If the
1569 target already uses a soft frame pointer, the transition is trivial. */
1570 if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
1572 warning (0, "-fstack-protector not supported for this target");
1573 flag_stack_protect = 0;
1575 if (!flag_stack_protect)
1576 warn_stack_protect = 0;
1578 /* Address Sanitizer needs porting to each target architecture. */
1580 if ((flag_sanitize & SANITIZE_ADDRESS)
1581 && !FRAME_GROWS_DOWNWARD)
1583 warning (0,
1584 "-fsanitize=address and -fsanitize=kernel-address "
1585 "are not supported for this target");
1586 flag_sanitize &= ~SANITIZE_ADDRESS;
1589 if ((flag_sanitize & SANITIZE_USER_ADDRESS)
1590 && targetm.asan_shadow_offset == NULL)
1592 warning (0, "-fsanitize=address not supported for this target");
1593 flag_sanitize &= ~SANITIZE_ADDRESS;
1596 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1597 have not been set. */
1598 if (!global_options_set.x_warnings_are_errors
1599 && warn_coverage_mismatch
1600 && (global_dc->classify_diagnostic[OPT_Wcoverage_mismatch] ==
1601 DK_UNSPECIFIED))
1602 diagnostic_classify_diagnostic (global_dc, OPT_Wcoverage_mismatch,
1603 DK_ERROR, UNKNOWN_LOCATION);
1605 /* Save the current optimization options. */
1606 optimization_default_node = build_optimization_node (&global_options);
1607 optimization_current_node = optimization_default_node;
1610 /* This function can be called multiple times to reinitialize the compiler
1611 back end when register classes or instruction sets have changed,
1612 before each function. */
1613 static void
1614 backend_init_target (void)
1616 /* Initialize alignment variables. */
1617 init_alignments ();
1619 /* This depends on stack_pointer_rtx. */
1620 init_fake_stack_mems ();
1622 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1623 mode-dependent. */
1624 init_alias_target ();
1626 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1627 init_reload ();
1629 /* Depends on the enabled attribute. */
1630 recog_init ();
1632 /* The following initialization functions need to generate rtl, so
1633 provide a dummy function context for them. */
1634 init_dummy_function_start ();
1636 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1637 on a mode change. */
1638 init_expmed ();
1639 init_lower_subreg ();
1640 init_set_costs ();
1642 init_expr_target ();
1643 ira_init ();
1645 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1646 after a mode change as well. */
1647 caller_save_initialized_p = false;
1649 expand_dummy_function_end ();
1652 /* Initialize the compiler back end. This function is called only once,
1653 when starting the compiler. */
1654 static void
1655 backend_init (void)
1657 init_emit_once ();
1659 init_rtlanal ();
1660 init_inline_once ();
1661 init_varasm_once ();
1662 save_register_info ();
1664 /* Middle end needs this initialization for default mem attributes
1665 used by early calls to make_decl_rtl. */
1666 init_emit_regs ();
1668 /* Middle end needs this initialization for mode tables used to assign
1669 modes to vector variables. */
1670 init_regs ();
1673 /* Initialize excess precision settings. */
1674 static void
1675 init_excess_precision (void)
1677 /* Adjust excess precision handling based on the target options. If
1678 the front end cannot handle it, flag_excess_precision_cmdline
1679 will already have been set accordingly in the post_options
1680 hook. */
1681 gcc_assert (flag_excess_precision_cmdline != EXCESS_PRECISION_DEFAULT);
1682 flag_excess_precision = flag_excess_precision_cmdline;
1683 if (flag_unsafe_math_optimizations)
1684 flag_excess_precision = EXCESS_PRECISION_FAST;
1685 if (flag_excess_precision == EXCESS_PRECISION_STANDARD)
1687 int flt_eval_method = TARGET_FLT_EVAL_METHOD;
1688 switch (flt_eval_method)
1690 case -1:
1691 case 0:
1692 /* Either the target acts unpredictably (-1) or has all the
1693 operations required not to have excess precision (0). */
1694 flag_excess_precision = EXCESS_PRECISION_FAST;
1695 break;
1696 case 1:
1697 case 2:
1698 /* In these cases, predictable excess precision makes
1699 sense. */
1700 break;
1701 default:
1702 /* Any other implementation-defined FLT_EVAL_METHOD values
1703 require the compiler to handle the associated excess
1704 precision rules in excess_precision_type. */
1705 gcc_unreachable ();
1710 /* Initialize things that are both lang-dependent and target-dependent.
1711 This function can be called more than once if target parameters change. */
1712 static void
1713 lang_dependent_init_target (void)
1715 /* This determines excess precision settings. */
1716 init_excess_precision ();
1718 /* This creates various _DECL nodes, so needs to be called after the
1719 front end is initialized. It also depends on the HAVE_xxx macros
1720 generated from the target machine description. */
1721 init_optabs ();
1723 gcc_assert (!this_target_rtl->target_specific_initialized);
1726 /* Perform initializations that are lang-dependent or target-dependent.
1727 but matters only for late optimizations and RTL generation. */
1729 static int rtl_initialized;
1731 void
1732 initialize_rtl (void)
1734 /* Initialization done just once per compilation, but delayed
1735 till code generation. */
1736 if (!rtl_initialized)
1737 ira_init_once ();
1738 rtl_initialized = true;
1740 /* Target specific RTL backend initialization. */
1741 if (!this_target_rtl->target_specific_initialized)
1743 backend_init_target ();
1744 this_target_rtl->target_specific_initialized = true;
1748 /* Language-dependent initialization. Returns nonzero on success. */
1749 static int
1750 lang_dependent_init (const char *name)
1752 location_t save_loc = input_location;
1753 if (dump_base_name == 0)
1754 dump_base_name = name && name[0] ? name : "gccdump";
1756 /* Other front-end initialization. */
1757 input_location = BUILTINS_LOCATION;
1758 if (lang_hooks.init () == 0)
1759 return 0;
1760 input_location = save_loc;
1762 if (!flag_wpa)
1764 init_asm_output (name);
1766 /* If stack usage information is desired, open the output file. */
1767 if (flag_stack_usage)
1768 stack_usage_file = open_auxiliary_file ("su");
1771 /* This creates various _DECL nodes, so needs to be called after the
1772 front end is initialized. */
1773 init_eh ();
1775 /* Do the target-specific parts of the initialization. */
1776 lang_dependent_init_target ();
1778 if (!flag_wpa)
1780 /* If dbx symbol table desired, initialize writing it and output the
1781 predefined types. */
1782 timevar_push (TV_SYMOUT);
1784 /* Now we have the correct original filename, we can initialize
1785 debug output. */
1786 (*debug_hooks->init) (name);
1788 timevar_pop (TV_SYMOUT);
1791 return 1;
1795 /* Reinitialize everything when target parameters, such as register usage,
1796 have changed. */
1797 void
1798 target_reinit (void)
1800 struct rtl_data saved_x_rtl;
1801 rtx *saved_regno_reg_rtx;
1802 tree saved_optimization_current_node;
1803 struct target_optabs *saved_this_fn_optabs;
1805 /* Temporarily switch to the default optimization node, so that
1806 *this_target_optabs is set to the default, not reflecting
1807 whatever a previous function used for the optimize
1808 attribute. */
1809 saved_optimization_current_node = optimization_current_node;
1810 saved_this_fn_optabs = this_fn_optabs;
1811 if (saved_optimization_current_node != optimization_default_node)
1813 optimization_current_node = optimization_default_node;
1814 cl_optimization_restore
1815 (&global_options,
1816 TREE_OPTIMIZATION (optimization_default_node));
1818 this_fn_optabs = this_target_optabs;
1820 /* Save *crtl and regno_reg_rtx around the reinitialization
1821 to allow target_reinit being called even after prepare_function_start. */
1822 saved_regno_reg_rtx = regno_reg_rtx;
1823 if (saved_regno_reg_rtx)
1825 saved_x_rtl = *crtl;
1826 memset (crtl, '\0', sizeof (*crtl));
1827 regno_reg_rtx = NULL;
1830 this_target_rtl->target_specific_initialized = false;
1832 /* This initializes hard_frame_pointer, and calls init_reg_modes_target()
1833 to initialize reg_raw_mode[]. */
1834 init_emit_regs ();
1836 /* This invokes target hooks to set fixed_reg[] etc, which is
1837 mode-dependent. */
1838 init_regs ();
1840 /* Reinitialize lang-dependent parts. */
1841 lang_dependent_init_target ();
1843 /* Restore the original optimization node. */
1844 if (saved_optimization_current_node != optimization_default_node)
1846 optimization_current_node = saved_optimization_current_node;
1847 cl_optimization_restore (&global_options,
1848 TREE_OPTIMIZATION (optimization_current_node));
1850 this_fn_optabs = saved_this_fn_optabs;
1852 /* Restore regno_reg_rtx at the end, as free_after_compilation from
1853 expand_dummy_function_end clears it. */
1854 if (saved_regno_reg_rtx)
1856 *crtl = saved_x_rtl;
1857 regno_reg_rtx = saved_regno_reg_rtx;
1858 saved_regno_reg_rtx = NULL;
1862 void
1863 dump_memory_report (bool final)
1865 dump_line_table_statistics ();
1866 ggc_print_statistics ();
1867 stringpool_statistics ();
1868 dump_tree_statistics ();
1869 dump_gimple_statistics ();
1870 dump_rtx_statistics ();
1871 dump_alloc_pool_statistics ();
1872 dump_bitmap_statistics ();
1873 dump_vec_loc_statistics ();
1874 dump_ggc_loc_statistics (final);
1875 dump_alias_stats (stderr);
1876 dump_pta_stats (stderr);
1879 /* Clean up: close opened files, etc. */
1881 static void
1882 finalize (bool no_backend)
1884 /* Close the dump files. */
1885 if (flag_gen_aux_info)
1887 fclose (aux_info_file);
1888 if (seen_error ())
1889 unlink (aux_info_file_name);
1892 /* Close non-debugging input and output files. Take special care to note
1893 whether fclose returns an error, since the pages might still be on the
1894 buffer chain while the file is open. */
1896 if (asm_out_file)
1898 if (ferror (asm_out_file) != 0)
1899 fatal_error ("error writing to %s: %m", asm_file_name);
1900 if (fclose (asm_out_file) != 0)
1901 fatal_error ("error closing %s: %m", asm_file_name);
1904 if (stack_usage_file)
1905 fclose (stack_usage_file);
1907 if (!no_backend)
1909 statistics_fini ();
1911 g->get_passes ()->finish_optimization_passes ();
1913 lra_finish_once ();
1916 if (mem_report)
1917 dump_memory_report (true);
1919 if (profile_report)
1920 dump_profile_report ();
1922 /* Language-specific end of compilation actions. */
1923 lang_hooks.finish ();
1926 static bool
1927 standard_type_bitsize (int bitsize)
1929 /* As a special exception, we always want __int128 enabled if possible. */
1930 if (bitsize == 128)
1931 return false;
1932 if (bitsize == CHAR_TYPE_SIZE
1933 || bitsize == SHORT_TYPE_SIZE
1934 || bitsize == INT_TYPE_SIZE
1935 || bitsize == LONG_TYPE_SIZE
1936 || bitsize == LONG_LONG_TYPE_SIZE)
1937 return true;
1938 return false;
1941 /* Initialize the compiler, and compile the input file. */
1942 static void
1943 do_compile ()
1945 process_options ();
1947 /* Don't do any more if an error has already occurred. */
1948 if (!seen_error ())
1950 int i;
1952 timevar_start (TV_PHASE_SETUP);
1954 /* This must be run always, because it is needed to compute the FP
1955 predefined macros, such as __LDBL_MAX__, for targets using non
1956 default FP formats. */
1957 init_adjust_machine_modes ();
1958 init_derived_machine_modes ();
1960 /* This must happen after the backend has a chance to process
1961 command line options, but before the parsers are
1962 initialized. */
1963 for (i = 0; i < NUM_INT_N_ENTS; i ++)
1964 if (targetm.scalar_mode_supported_p (int_n_data[i].m)
1965 && ! standard_type_bitsize (int_n_data[i].bitsize))
1966 int_n_enabled_p[i] = true;
1967 else
1968 int_n_enabled_p[i] = false;
1970 /* Set up the back-end if requested. */
1971 if (!no_backend)
1972 backend_init ();
1974 /* Language-dependent initialization. Returns true on success. */
1975 if (lang_dependent_init (main_input_filename))
1977 /* Initialize yet another pass. */
1979 ggc_protect_identifiers = true;
1981 symtab->initialize ();
1982 init_final (main_input_filename);
1983 coverage_init (aux_base_name);
1984 statistics_init ();
1985 invoke_plugin_callbacks (PLUGIN_START_UNIT, NULL);
1987 timevar_stop (TV_PHASE_SETUP);
1989 compile_file ();
1991 else
1993 timevar_stop (TV_PHASE_SETUP);
1996 timevar_start (TV_PHASE_FINALIZE);
1998 finalize (no_backend);
2000 timevar_stop (TV_PHASE_FINALIZE);
2004 toplev::toplev (bool use_TV_TOTAL)
2005 : m_use_TV_TOTAL (use_TV_TOTAL)
2007 if (!m_use_TV_TOTAL)
2008 start_timevars ();
2011 toplev::~toplev ()
2013 timevar_stop (TV_TOTAL);
2014 timevar_print (stderr);
2017 void
2018 toplev::start_timevars ()
2020 if (time_report || !quiet_flag || flag_detailed_statistics)
2021 timevar_init ();
2023 timevar_start (TV_TOTAL);
2026 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2027 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2028 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2030 It is not safe to call this function more than once. */
2033 toplev::main (int argc, char **argv)
2035 /* Parsing and gimplification sometimes need quite large stack.
2036 Increase stack size limits if possible. */
2037 stack_limit_increase (64 * 1024 * 1024);
2039 expandargv (&argc, &argv);
2041 /* Initialization of GCC's environment, and diagnostics. */
2042 general_init (argv[0]);
2044 /* One-off initialization of options that does not need to be
2045 repeated when options are added for particular functions. */
2046 init_options_once ();
2048 /* Initialize global options structures; this must be repeated for
2049 each structure used for parsing options. */
2050 init_options_struct (&global_options, &global_options_set);
2051 lang_hooks.init_options_struct (&global_options);
2053 /* Convert the options to an array. */
2054 decode_cmdline_options_to_array_default_mask (argc,
2055 CONST_CAST2 (const char **,
2056 char **, argv),
2057 &save_decoded_options,
2058 &save_decoded_options_count);
2060 /* Perform language-specific options initialization. */
2061 lang_hooks.init_options (save_decoded_options_count, save_decoded_options);
2063 /* Parse the options and do minimal processing; basically just
2064 enough to default flags appropriately. */
2065 decode_options (&global_options, &global_options_set,
2066 save_decoded_options, save_decoded_options_count,
2067 UNKNOWN_LOCATION, global_dc);
2069 handle_common_deferred_options ();
2071 init_local_tick ();
2073 initialize_plugins ();
2075 if (version_flag)
2076 print_version (stderr, "");
2078 if (help_flag)
2079 print_plugins_help (stderr, "");
2081 /* Exit early if we can (e.g. -help). */
2082 if (!exit_after_options)
2084 if (m_use_TV_TOTAL)
2085 start_timevars ();
2086 do_compile ();
2089 if (warningcount || errorcount || werrorcount)
2090 print_ignored_options ();
2092 /* Invoke registered plugin callbacks if any. Some plugins could
2093 emit some diagnostics here. */
2094 invoke_plugin_callbacks (PLUGIN_FINISH, NULL);
2096 diagnostic_finish (global_dc);
2098 finalize_plugins ();
2099 location_adhoc_data_fini (line_table);
2100 if (seen_error () || werrorcount)
2101 return (FATAL_EXIT_CODE);
2103 return (SUCCESS_EXIT_CODE);
2106 /* For those that want to, this function aims to clean up enough state that
2107 you can call toplev::main again. */
2108 void
2109 toplev::finalize (void)
2111 rtl_initialized = false;
2112 this_target_rtl->target_specific_initialized = false;
2114 cgraph_c_finalize ();
2115 cgraphunit_c_finalize ();
2116 dwarf2out_c_finalize ();
2117 gcse_c_finalize ();
2118 ipa_cp_c_finalize ();
2119 ipa_reference_c_finalize ();
2120 params_c_finalize ();