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[official-gcc.git] / gcc / toplev.c
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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"
100 #include "tree-chkp.h"
101 #include "omp-low.h"
103 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
104 #include "dbxout.h"
105 #endif
107 #ifdef SDB_DEBUGGING_INFO
108 #include "sdbout.h"
109 #endif
111 #ifdef XCOFF_DEBUGGING_INFO
112 #include "xcoffout.h" /* Needed for external data
113 declarations for e.g. AIX 4.x. */
114 #endif
116 #include <new>
118 static void general_init (const char *);
119 static void do_compile ();
120 static void process_options (void);
121 static void backend_init (void);
122 static int lang_dependent_init (const char *);
123 static void init_asm_output (const char *);
124 static void finalize (bool);
126 static void crash_signal (int) ATTRIBUTE_NORETURN;
127 static void compile_file (void);
129 /* True if we don't need a backend (e.g. preprocessing only). */
130 static bool no_backend;
132 /* Length of line when printing switch values. */
133 #define MAX_LINE 75
135 /* Decoded options, and number of such options. */
136 struct cl_decoded_option *save_decoded_options;
137 unsigned int save_decoded_options_count;
139 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
140 to optimize in process_options (). */
141 #define AUTODETECT_VALUE 2
143 /* Debug hooks - dependent upon command line options. */
145 const struct gcc_debug_hooks *debug_hooks;
147 /* The FUNCTION_DECL for the function currently being compiled,
148 or 0 if between functions. */
149 tree current_function_decl;
151 /* Set to the FUNC_BEGIN label of the current function, or NULL
152 if none. */
153 const char * current_function_func_begin_label;
155 /* A random sequence of characters, unless overridden by user. */
156 static const char *flag_random_seed;
158 /* A local time stamp derived from the time of compilation. It will be
159 zero if the system cannot provide a time. It will be -1u, if the
160 user has specified a particular random seed. */
161 unsigned local_tick;
163 /* Random number for this compilation */
164 HOST_WIDE_INT random_seed;
166 /* -f flags. */
168 /* When non-NULL, indicates that whenever space is allocated on the
169 stack, the resulting stack pointer must not pass this
170 address---that is, for stacks that grow downward, the stack pointer
171 must always be greater than or equal to this address; for stacks
172 that grow upward, the stack pointer must be less than this address.
173 At present, the rtx may be either a REG or a SYMBOL_REF, although
174 the support provided depends on the backend. */
175 rtx stack_limit_rtx;
177 /* True if the user has tagged the function with the 'section'
178 attribute. */
180 bool user_defined_section_attribute = false;
182 struct target_flag_state default_target_flag_state;
183 #if SWITCHABLE_TARGET
184 struct target_flag_state *this_target_flag_state = &default_target_flag_state;
185 #else
186 #define this_target_flag_state (&default_target_flag_state)
187 #endif
189 /* The user symbol prefix after having resolved same. */
190 const char *user_label_prefix;
192 /* Output files for assembler code (real compiler output)
193 and debugging dumps. */
195 FILE *asm_out_file;
196 FILE *aux_info_file;
197 FILE *stack_usage_file = NULL;
199 /* The current working directory of a translation. It's generally the
200 directory from which compilation was initiated, but a preprocessed
201 file may specify the original directory in which it was
202 created. */
204 static const char *src_pwd;
206 /* Initialize src_pwd with the given string, and return true. If it
207 was already initialized, return false. As a special case, it may
208 be called with a NULL argument to test whether src_pwd has NOT been
209 initialized yet. */
211 bool
212 set_src_pwd (const char *pwd)
214 if (src_pwd)
216 if (strcmp (src_pwd, pwd) == 0)
217 return true;
218 else
219 return false;
222 src_pwd = xstrdup (pwd);
223 return true;
226 /* Return the directory from which the translation unit was initiated,
227 in case set_src_pwd() was not called before to assign it a
228 different value. */
230 const char *
231 get_src_pwd (void)
233 if (! src_pwd)
235 src_pwd = getpwd ();
236 if (!src_pwd)
237 src_pwd = ".";
240 return src_pwd;
243 /* Called when the start of a function definition is parsed,
244 this function prints on stderr the name of the function. */
245 void
246 announce_function (tree decl)
248 if (!quiet_flag)
250 if (rtl_dump_and_exit)
251 fprintf (stderr, "%s ",
252 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl))));
253 else
254 fprintf (stderr, " %s",
255 identifier_to_locale (lang_hooks.decl_printable_name (decl, 2)));
256 fflush (stderr);
257 pp_needs_newline (global_dc->printer) = true;
258 diagnostic_set_last_function (global_dc, (diagnostic_info *) NULL);
262 /* Initialize local_tick with a random number or -1 if
263 flag_random_seed is set. */
265 static void
266 init_local_tick (void)
268 if (!flag_random_seed)
270 /* Try urandom first. Time of day is too likely to collide.
271 In case of any error we just use the local tick. */
273 int fd = open ("/dev/urandom", O_RDONLY);
274 if (fd >= 0)
276 read (fd, &random_seed, sizeof (random_seed));
277 close (fd);
280 /* Now get the tick anyways */
281 #ifdef HAVE_GETTIMEOFDAY
283 struct timeval tv;
285 gettimeofday (&tv, NULL);
286 local_tick = (unsigned) tv.tv_sec * 1000 + tv.tv_usec / 1000;
288 #else
290 time_t now = time (NULL);
292 if (now != (time_t)-1)
293 local_tick = (unsigned) now;
295 #endif
297 else
298 local_tick = -1;
301 /* Set up a default flag_random_seed and local_tick, unless the user
302 already specified one. Must be called after init_local_tick. */
304 static void
305 init_random_seed (void)
307 if (!random_seed)
308 random_seed = local_tick ^ getpid (); /* Old racey fallback method */
311 /* Obtain the random_seed. Unless NOINIT, initialize it if
312 it's not provided in the command line. */
314 HOST_WIDE_INT
315 get_random_seed (bool noinit)
317 if (!flag_random_seed && !noinit)
318 init_random_seed ();
319 return random_seed;
322 /* Modify the random_seed string to VAL. Return its previous
323 value. */
325 const char *
326 set_random_seed (const char *val)
328 const char *old = flag_random_seed;
329 flag_random_seed = val;
330 if (flag_random_seed)
332 char *endp;
334 /* When the driver passed in a hex number don't crc it again */
335 random_seed = strtoul (flag_random_seed, &endp, 0);
336 if (!(endp > flag_random_seed && *endp == 0))
337 random_seed = crc32_string (0, flag_random_seed);
339 return old;
342 /* Handler for fatal signals, such as SIGSEGV. These are transformed
343 into ICE messages, which is much more user friendly. In case the
344 error printer crashes, reset the signal to prevent infinite recursion. */
346 static void
347 crash_signal (int signo)
349 signal (signo, SIG_DFL);
351 /* If we crashed while processing an ASM statement, then be a little more
352 graceful. It's most likely the user's fault. */
353 if (this_is_asm_operands)
355 output_operand_lossage ("unrecoverable error");
356 exit (FATAL_EXIT_CODE);
359 internal_error ("%s", strsignal (signo));
362 /* A subroutine of wrapup_global_declarations. We've come to the end of
363 the compilation unit. All deferred variables should be undeferred,
364 and all incomplete decls should be finalized. */
366 void
367 wrapup_global_declaration_1 (tree decl)
369 /* We're not deferring this any longer. Assignment is conditional to
370 avoid needlessly dirtying PCH pages. */
371 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl), TS_DECL_WITH_VIS)
372 && DECL_DEFER_OUTPUT (decl) != 0)
373 DECL_DEFER_OUTPUT (decl) = 0;
375 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
376 lang_hooks.finish_incomplete_decl (decl);
379 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
380 needs to be output. Return true if it is output. */
382 bool
383 wrapup_global_declaration_2 (tree decl)
385 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl)
386 || (TREE_CODE (decl) == VAR_DECL && DECL_HAS_VALUE_EXPR_P (decl)))
387 return false;
389 /* Don't write out static consts, unless we still need them.
391 We also keep static consts if not optimizing (for debugging),
392 unless the user specified -fno-keep-static-consts.
393 ??? They might be better written into the debug information.
394 This is possible when using DWARF.
396 A language processor that wants static constants to be always
397 written out (even if it is not used) is responsible for
398 calling rest_of_decl_compilation itself. E.g. the C front-end
399 calls rest_of_decl_compilation from finish_decl.
400 One motivation for this is that is conventional in some
401 environments to write things like:
402 static const char rcsid[] = "... version string ...";
403 intending to force the string to be in the executable.
405 A language processor that would prefer to have unneeded
406 static constants "optimized away" would just defer writing
407 them out until here. E.g. C++ does this, because static
408 constants are often defined in header files.
410 ??? A tempting alternative (for both C and C++) would be
411 to force a constant to be written if and only if it is
412 defined in a main file, as opposed to an include file. */
414 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
416 varpool_node *node;
417 bool needed = true;
418 node = varpool_node::get (decl);
420 if (!node && flag_ltrans)
421 needed = false;
422 else if (node && node->definition)
423 needed = false;
424 else if (node && node->alias)
425 needed = false;
426 else if (!symtab->global_info_ready
427 && (TREE_USED (decl)
428 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
429 /* needed */;
430 else if (node && node->analyzed)
431 /* needed */;
432 else if (DECL_COMDAT (decl))
433 needed = false;
434 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
435 && (optimize || !flag_keep_static_consts
436 || DECL_ARTIFICIAL (decl)))
437 needed = false;
439 if (needed)
441 rest_of_decl_compilation (decl, 1, 1);
442 return true;
446 return false;
449 /* Do any final processing required for the declarations in VEC, of
450 which there are LEN. We write out inline functions and variables
451 that have been deferred until this point, but which are required.
452 Returns nonzero if anything was put out. */
454 bool
455 wrapup_global_declarations (tree *vec, int len)
457 bool reconsider, output_something = false;
458 int i;
460 for (i = 0; i < len; i++)
461 wrapup_global_declaration_1 (vec[i]);
463 /* Now emit any global variables or functions that we have been
464 putting off. We need to loop in case one of the things emitted
465 here references another one which comes earlier in the list. */
468 reconsider = false;
469 for (i = 0; i < len; i++)
470 reconsider |= wrapup_global_declaration_2 (vec[i]);
471 if (reconsider)
472 output_something = true;
474 while (reconsider);
476 return output_something;
479 /* A subroutine of check_global_declarations. Issue appropriate warnings
480 for the global declaration DECL. */
482 void
483 check_global_declaration_1 (tree decl)
485 /* Warn about any function declared static but not defined. We don't
486 warn about variables, because many programs have static variables
487 that exist only to get some text into the object file. */
488 if (TREE_CODE (decl) == FUNCTION_DECL
489 && DECL_INITIAL (decl) == 0
490 && DECL_EXTERNAL (decl)
491 && ! DECL_ARTIFICIAL (decl)
492 && ! TREE_NO_WARNING (decl)
493 && ! TREE_PUBLIC (decl)
494 && (warn_unused_function
495 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
497 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
498 pedwarn (input_location, 0, "%q+F used but never defined", decl);
499 else
500 warning (OPT_Wunused_function, "%q+F declared %<static%> but never defined", decl);
501 /* This symbol is effectively an "extern" declaration now. */
502 TREE_PUBLIC (decl) = 1;
505 /* Warn about static fns or vars defined but not used. */
506 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
507 /* We don't warn about "static const" variables because the
508 "rcs_id" idiom uses that construction. */
509 || (warn_unused_variable
510 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
511 && ! DECL_IN_SYSTEM_HEADER (decl)
512 && ! TREE_USED (decl)
513 /* The TREE_USED bit for file-scope decls is kept in the identifier,
514 to handle multiple external decls in different scopes. */
515 && ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl)))
516 && ! DECL_EXTERNAL (decl)
517 && ! TREE_PUBLIC (decl)
518 /* A volatile variable might be used in some non-obvious way. */
519 && ! TREE_THIS_VOLATILE (decl)
520 /* Global register variables must be declared to reserve them. */
521 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
522 /* Otherwise, ask the language. */
523 && lang_hooks.decls.warn_unused_global (decl))
524 warning ((TREE_CODE (decl) == FUNCTION_DECL)
525 ? OPT_Wunused_function
526 : OPT_Wunused_variable,
527 "%q+D defined but not used", decl);
530 /* Issue appropriate warnings for the global declarations in V (of
531 which there are LEN). */
533 void
534 check_global_declarations (tree *v, int len)
536 int i;
538 for (i = 0; i < len; i++)
539 check_global_declaration_1 (v[i]);
542 /* Emit debugging information for all global declarations in VEC. */
544 void
545 emit_debug_global_declarations (tree *vec, int len)
547 int i;
549 /* Avoid confusing the debug information machinery when there are errors. */
550 if (seen_error ())
551 return;
553 timevar_push (TV_SYMOUT);
554 for (i = 0; i < len; i++)
555 debug_hooks->global_decl (vec[i]);
556 timevar_pop (TV_SYMOUT);
559 /* Compile an entire translation unit. Write a file of assembly
560 output and various debugging dumps. */
562 static void
563 compile_file (void)
565 timevar_start (TV_PHASE_PARSING);
566 timevar_push (TV_PARSE_GLOBAL);
568 /* Call the parser, which parses the entire file (calling
569 rest_of_compilation for each function). */
570 lang_hooks.parse_file ();
572 timevar_pop (TV_PARSE_GLOBAL);
573 timevar_stop (TV_PHASE_PARSING);
575 /* Compilation is now finished except for writing
576 what's left of the symbol table output. */
578 if (flag_syntax_only || flag_wpa)
579 return;
581 ggc_protect_identifiers = false;
583 /* This must also call finalize_compilation_unit. */
584 lang_hooks.decls.final_write_globals ();
586 if (seen_error ())
587 return;
589 timevar_start (TV_PHASE_LATE_ASM);
591 /* Compilation unit is finalized. When producing non-fat LTO object, we are
592 basically finished. */
593 if (in_lto_p || !flag_lto || flag_fat_lto_objects)
595 /* File-scope initialization for AddressSanitizer. */
596 if (flag_sanitize & SANITIZE_ADDRESS)
597 asan_finish_file ();
599 if (flag_sanitize & SANITIZE_THREAD)
600 tsan_finish_file ();
602 if (flag_check_pointer_bounds)
603 chkp_finish_file ();
605 omp_finish_file ();
607 output_shared_constant_pool ();
608 output_object_blocks ();
609 finish_tm_clone_pairs ();
611 /* Write out any pending weak symbol declarations. */
612 weak_finish ();
614 /* This must be at the end before unwind and debug info.
615 Some target ports emit PIC setup thunks here. */
616 targetm.asm_out.code_end ();
618 /* Do dbx symbols. */
619 timevar_push (TV_SYMOUT);
621 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
622 if (dwarf2out_do_frame ())
623 dwarf2out_frame_finish ();
624 #endif
626 (*debug_hooks->finish) (main_input_filename);
627 timevar_pop (TV_SYMOUT);
629 /* Output some stuff at end of file if nec. */
631 dw2_output_indirect_constants ();
633 /* Flush any pending external directives. */
634 process_pending_assemble_externals ();
637 /* Emit LTO marker if LTO info has been previously emitted. This is
638 used by collect2 to determine whether an object file contains IL.
639 We used to emit an undefined reference here, but this produces
640 link errors if an object file with IL is stored into a shared
641 library without invoking lto1. */
642 if (flag_generate_lto)
644 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
645 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
646 "__gnu_lto_v1",
647 (unsigned HOST_WIDE_INT) 1, 8);
648 #elif defined ASM_OUTPUT_ALIGNED_COMMON
649 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_v1",
650 (unsigned HOST_WIDE_INT) 1, 8);
651 #else
652 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_v1",
653 (unsigned HOST_WIDE_INT) 1,
654 (unsigned HOST_WIDE_INT) 1);
655 #endif
656 /* Let linker plugin know that this is a slim object and must be LTOed
657 even when user did not ask for it. */
658 if (!flag_fat_lto_objects)
660 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
661 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
662 "__gnu_lto_slim",
663 (unsigned HOST_WIDE_INT) 1, 8);
664 #elif defined ASM_OUTPUT_ALIGNED_COMMON
665 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_slim",
666 (unsigned HOST_WIDE_INT) 1, 8);
667 #else
668 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_slim",
669 (unsigned HOST_WIDE_INT) 1,
670 (unsigned HOST_WIDE_INT) 1);
671 #endif
675 /* Attach a special .ident directive to the end of the file to identify
676 the version of GCC which compiled this code. The format of the .ident
677 string is patterned after the ones produced by native SVR4 compilers. */
678 if (!flag_no_ident)
680 const char *pkg_version = "(GNU) ";
681 char *ident_str;
683 if (strcmp ("(GCC) ", pkgversion_string))
684 pkg_version = pkgversion_string;
686 ident_str = ACONCAT (("GCC: ", pkg_version, version_string, NULL));
687 targetm.asm_out.output_ident (ident_str);
690 /* Auto profile finalization. */
691 if (flag_auto_profile)
692 end_auto_profile ();
694 /* Invoke registered plugin callbacks. */
695 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT, NULL);
697 /* This must be at the end. Some target ports emit end of file directives
698 into the assembly file here, and hence we can not output anything to the
699 assembly file after this point. */
700 targetm.asm_out.file_end ();
702 timevar_stop (TV_PHASE_LATE_ASM);
705 /* Print version information to FILE.
706 Each line begins with INDENT (for the case where FILE is the
707 assembler output file). */
709 void
710 print_version (FILE *file, const char *indent)
712 static const char fmt1[] =
713 #ifdef __GNUC__
714 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
715 #else
716 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
717 #endif
719 static const char fmt2[] =
720 N_("GMP version %s, MPFR version %s, MPC version %s\n");
721 static const char fmt3[] =
722 N_("%s%swarning: %s header version %s differs from library version %s.\n");
723 static const char fmt4[] =
724 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
725 #ifndef __VERSION__
726 #define __VERSION__ "[?]"
727 #endif
728 fprintf (file,
729 file == stderr ? _(fmt1) : fmt1,
730 indent, *indent != 0 ? " " : "",
731 lang_hooks.name, pkgversion_string, version_string, TARGET_NAME,
732 indent, __VERSION__);
734 /* We need to stringify the GMP macro values. Ugh, gmp_version has
735 two string formats, "i.j.k" and "i.j" when k is zero. As of
736 gmp-4.3.0, GMP always uses the 3 number format. */
737 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
738 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3 (X)
739 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
740 #define GCC_GMP_VERSION \
741 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
742 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
743 #define GCC_GMP_STRINGIFY_VERSION \
744 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
745 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR)
746 #else
747 #define GCC_GMP_STRINGIFY_VERSION \
748 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
749 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR) "." \
750 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_PATCHLEVEL)
751 #endif
752 fprintf (file,
753 file == stderr ? _(fmt2) : fmt2,
754 GCC_GMP_STRINGIFY_VERSION, MPFR_VERSION_STRING, MPC_VERSION_STRING);
755 if (strcmp (GCC_GMP_STRINGIFY_VERSION, gmp_version))
756 fprintf (file,
757 file == stderr ? _(fmt3) : fmt3,
758 indent, *indent != 0 ? " " : "",
759 "GMP", GCC_GMP_STRINGIFY_VERSION, gmp_version);
760 if (strcmp (MPFR_VERSION_STRING, mpfr_get_version ()))
761 fprintf (file,
762 file == stderr ? _(fmt3) : fmt3,
763 indent, *indent != 0 ? " " : "",
764 "MPFR", MPFR_VERSION_STRING, mpfr_get_version ());
765 if (strcmp (MPC_VERSION_STRING, mpc_get_version ()))
766 fprintf (file,
767 file == stderr ? _(fmt3) : fmt3,
768 indent, *indent != 0 ? " " : "",
769 "MPC", MPC_VERSION_STRING, mpc_get_version ());
770 fprintf (file,
771 file == stderr ? _(fmt4) : fmt4,
772 indent, *indent != 0 ? " " : "",
773 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
775 print_plugins_versions (file, indent);
778 static int
779 print_to_asm_out_file (print_switch_type type, const char * text)
781 bool prepend_sep = true;
783 switch (type)
785 case SWITCH_TYPE_LINE_END:
786 putc ('\n', asm_out_file);
787 return 1;
789 case SWITCH_TYPE_LINE_START:
790 fputs (ASM_COMMENT_START, asm_out_file);
791 return strlen (ASM_COMMENT_START);
793 case SWITCH_TYPE_DESCRIPTIVE:
794 if (ASM_COMMENT_START[0] == 0)
795 prepend_sep = false;
796 /* Drop through. */
797 case SWITCH_TYPE_PASSED:
798 case SWITCH_TYPE_ENABLED:
799 if (prepend_sep)
800 fputc (' ', asm_out_file);
801 fputs (text, asm_out_file);
802 /* No need to return the length here as
803 print_single_switch has already done it. */
804 return 0;
806 default:
807 return -1;
811 static int
812 print_to_stderr (print_switch_type type, const char * text)
814 switch (type)
816 case SWITCH_TYPE_LINE_END:
817 putc ('\n', stderr);
818 return 1;
820 case SWITCH_TYPE_LINE_START:
821 return 0;
823 case SWITCH_TYPE_PASSED:
824 case SWITCH_TYPE_ENABLED:
825 fputc (' ', stderr);
826 /* Drop through. */
828 case SWITCH_TYPE_DESCRIPTIVE:
829 fputs (text, stderr);
830 /* No need to return the length here as
831 print_single_switch has already done it. */
832 return 0;
834 default:
835 return -1;
839 /* Print an option value and return the adjusted position in the line.
840 ??? print_fn doesn't handle errors, eg disk full; presumably other
841 code will catch a disk full though. */
843 static int
844 print_single_switch (print_switch_fn_type print_fn,
845 int pos,
846 print_switch_type type,
847 const char * text)
849 /* The ultrix fprintf returns 0 on success, so compute the result
850 we want here since we need it for the following test. The +1
851 is for the separator character that will probably be emitted. */
852 int len = strlen (text) + 1;
854 if (pos != 0
855 && pos + len > MAX_LINE)
857 print_fn (SWITCH_TYPE_LINE_END, NULL);
858 pos = 0;
861 if (pos == 0)
862 pos += print_fn (SWITCH_TYPE_LINE_START, NULL);
864 print_fn (type, text);
865 return pos + len;
868 /* Print active target switches using PRINT_FN.
869 POS is the current cursor position and MAX is the size of a "line".
870 Each line begins with INDENT and ends with TERM.
871 Each switch is separated from the next by SEP. */
873 static void
874 print_switch_values (print_switch_fn_type print_fn)
876 int pos = 0;
877 size_t j;
879 /* Fill in the -frandom-seed option, if the user didn't pass it, so
880 that it can be printed below. This helps reproducibility. */
881 if (!flag_random_seed)
882 init_random_seed ();
884 /* Print the options as passed. */
885 pos = print_single_switch (print_fn, pos,
886 SWITCH_TYPE_DESCRIPTIVE, _("options passed: "));
888 for (j = 1; j < save_decoded_options_count; j++)
890 switch (save_decoded_options[j].opt_index)
892 case OPT_o:
893 case OPT_d:
894 case OPT_dumpbase:
895 case OPT_dumpdir:
896 case OPT_auxbase:
897 case OPT_quiet:
898 case OPT_version:
899 /* Ignore these. */
900 continue;
903 pos = print_single_switch (print_fn, pos, SWITCH_TYPE_PASSED,
904 save_decoded_options[j].orig_option_with_args_text);
907 if (pos > 0)
908 print_fn (SWITCH_TYPE_LINE_END, NULL);
910 /* Print the -f and -m options that have been enabled.
911 We don't handle language specific options but printing argv
912 should suffice. */
913 pos = print_single_switch (print_fn, 0,
914 SWITCH_TYPE_DESCRIPTIVE, _("options enabled: "));
916 for (j = 0; j < cl_options_count; j++)
917 if (cl_options[j].cl_report
918 && option_enabled (j, &global_options) > 0)
919 pos = print_single_switch (print_fn, pos,
920 SWITCH_TYPE_ENABLED, cl_options[j].opt_text);
922 print_fn (SWITCH_TYPE_LINE_END, NULL);
925 /* Open assembly code output file. Do this even if -fsyntax-only is
926 on, because then the driver will have provided the name of a
927 temporary file or bit bucket for us. NAME is the file specified on
928 the command line, possibly NULL. */
929 static void
930 init_asm_output (const char *name)
932 if (name == NULL && asm_file_name == 0)
933 asm_out_file = stdout;
934 else
936 if (asm_file_name == 0)
938 int len = strlen (dump_base_name);
939 char *dumpname = XNEWVEC (char, len + 6);
941 memcpy (dumpname, dump_base_name, len + 1);
942 strip_off_ending (dumpname, len);
943 strcat (dumpname, ".s");
944 asm_file_name = dumpname;
946 if (!strcmp (asm_file_name, "-"))
947 asm_out_file = stdout;
948 else if (!canonical_filename_eq (asm_file_name, name))
949 asm_out_file = fopen (asm_file_name, "w");
950 else
951 /* Use fatal_error (UNKOWN_LOCATION) instead of just fatal_error to
952 prevent gcc from printing the first line in the current file. */
953 fatal_error (UNKNOWN_LOCATION,
954 "input file %qs is the same as output file",
955 asm_file_name);
956 if (asm_out_file == 0)
957 fatal_error (UNKNOWN_LOCATION,
958 "can%'t open %qs for writing: %m", asm_file_name);
961 if (!flag_syntax_only)
963 targetm.asm_out.file_start ();
965 if (flag_record_gcc_switches)
967 if (targetm.asm_out.record_gcc_switches)
969 /* Let the target know that we are about to start recording. */
970 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
971 NULL);
972 /* Now record the switches. */
973 print_switch_values (targetm.asm_out.record_gcc_switches);
974 /* Let the target know that the recording is over. */
975 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
976 NULL);
978 else
979 inform (input_location, "-frecord-gcc-switches is not supported by the current target");
982 if (flag_verbose_asm)
984 /* Print the list of switches in effect
985 into the assembler file as comments. */
986 print_version (asm_out_file, ASM_COMMENT_START);
987 print_switch_values (print_to_asm_out_file);
988 putc ('\n', asm_out_file);
993 /* A helper function; used as the reallocator function for cpp's line
994 table. */
995 static void *
996 realloc_for_line_map (void *ptr, size_t len)
998 return ggc_realloc (ptr, len);
1001 /* A helper function: used as the allocator function for
1002 identifier_to_locale. */
1003 static void *
1004 alloc_for_identifier_to_locale (size_t len)
1006 return ggc_alloc_atomic (len);
1009 /* Output stack usage information. */
1010 void
1011 output_stack_usage (void)
1013 static bool warning_issued = false;
1014 enum stack_usage_kind_type { STATIC = 0, DYNAMIC, DYNAMIC_BOUNDED };
1015 const char *stack_usage_kind_str[] = {
1016 "static",
1017 "dynamic",
1018 "dynamic,bounded"
1020 HOST_WIDE_INT stack_usage = current_function_static_stack_size;
1021 enum stack_usage_kind_type stack_usage_kind;
1023 if (stack_usage < 0)
1025 if (!warning_issued)
1027 warning (0, "stack usage computation not supported for this target");
1028 warning_issued = true;
1030 return;
1033 stack_usage_kind = STATIC;
1035 /* Add the maximum amount of space pushed onto the stack. */
1036 if (current_function_pushed_stack_size > 0)
1038 stack_usage += current_function_pushed_stack_size;
1039 stack_usage_kind = DYNAMIC_BOUNDED;
1042 /* Now on to the tricky part: dynamic stack allocation. */
1043 if (current_function_allocates_dynamic_stack_space)
1045 if (current_function_has_unbounded_dynamic_stack_size)
1046 stack_usage_kind = DYNAMIC;
1047 else
1048 stack_usage_kind = DYNAMIC_BOUNDED;
1050 /* Add the size even in the unbounded case, this can't hurt. */
1051 stack_usage += current_function_dynamic_stack_size;
1054 if (flag_stack_usage)
1056 expanded_location loc
1057 = expand_location (DECL_SOURCE_LOCATION (current_function_decl));
1058 /* We don't want to print the full qualified name because it can be long,
1059 so we strip the scope prefix, but we may need to deal with the suffix
1060 created by the compiler. */
1061 const char *suffix
1062 = strchr (IDENTIFIER_POINTER (DECL_NAME (current_function_decl)), '.');
1063 const char *name
1064 = lang_hooks.decl_printable_name (current_function_decl, 2);
1065 if (suffix)
1067 const char *dot = strchr (name, '.');
1068 while (dot && strcasecmp (dot, suffix) != 0)
1070 name = dot + 1;
1071 dot = strchr (name, '.');
1074 else
1076 const char *dot = strrchr (name, '.');
1077 if (dot)
1078 name = dot + 1;
1081 fprintf (stack_usage_file,
1082 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC"\t%s\n",
1083 lbasename (loc.file),
1084 loc.line,
1085 loc.column,
1086 name,
1087 stack_usage,
1088 stack_usage_kind_str[stack_usage_kind]);
1091 if (warn_stack_usage >= 0)
1093 const location_t loc = DECL_SOURCE_LOCATION (current_function_decl);
1095 if (stack_usage_kind == DYNAMIC)
1096 warning_at (loc, OPT_Wstack_usage_, "stack usage might be unbounded");
1097 else if (stack_usage > warn_stack_usage)
1099 if (stack_usage_kind == DYNAMIC_BOUNDED)
1100 warning_at (loc,
1101 OPT_Wstack_usage_, "stack usage might be %wd bytes",
1102 stack_usage);
1103 else
1104 warning_at (loc, OPT_Wstack_usage_, "stack usage is %wd bytes",
1105 stack_usage);
1110 /* Open an auxiliary output file. */
1111 static FILE *
1112 open_auxiliary_file (const char *ext)
1114 char *filename;
1115 FILE *file;
1117 filename = concat (aux_base_name, ".", ext, NULL);
1118 file = fopen (filename, "w");
1119 if (!file)
1120 fatal_error ("can%'t open %s for writing: %m", filename);
1121 free (filename);
1122 return file;
1125 /* Initialization of the front end environment, before command line
1126 options are parsed. Signal handlers, internationalization etc.
1127 ARGV0 is main's argv[0]. */
1128 static void
1129 general_init (const char *argv0)
1131 const char *p;
1133 p = argv0 + strlen (argv0);
1134 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1135 --p;
1136 progname = p;
1138 xmalloc_set_program_name (progname);
1140 hex_init ();
1142 /* Unlock the stdio streams. */
1143 unlock_std_streams ();
1145 gcc_init_libintl ();
1147 identifier_to_locale_alloc = alloc_for_identifier_to_locale;
1148 identifier_to_locale_free = ggc_free;
1150 /* Initialize the diagnostics reporting machinery, so option parsing
1151 can give warnings and errors. */
1152 diagnostic_initialize (global_dc, N_OPTS);
1153 /* Set a default printer. Language specific initializations will
1154 override it later. */
1155 tree_diagnostics_defaults (global_dc);
1157 global_dc->show_caret
1158 = global_options_init.x_flag_diagnostics_show_caret;
1159 global_dc->show_option_requested
1160 = global_options_init.x_flag_diagnostics_show_option;
1161 global_dc->show_column
1162 = global_options_init.x_flag_show_column;
1163 global_dc->internal_error = plugins_internal_error_function;
1164 global_dc->option_enabled = option_enabled;
1165 global_dc->option_state = &global_options;
1166 global_dc->option_name = option_name;
1168 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1169 #ifdef SIGSEGV
1170 signal (SIGSEGV, crash_signal);
1171 #endif
1172 #ifdef SIGILL
1173 signal (SIGILL, crash_signal);
1174 #endif
1175 #ifdef SIGBUS
1176 signal (SIGBUS, crash_signal);
1177 #endif
1178 #ifdef SIGABRT
1179 signal (SIGABRT, crash_signal);
1180 #endif
1181 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1182 signal (SIGIOT, crash_signal);
1183 #endif
1184 #ifdef SIGFPE
1185 signal (SIGFPE, crash_signal);
1186 #endif
1188 /* Other host-specific signal setup. */
1189 (*host_hooks.extra_signals)();
1191 /* Initialize the garbage-collector, string pools and tree type hash
1192 table. */
1193 init_ggc ();
1194 init_stringpool ();
1195 input_location = UNKNOWN_LOCATION;
1196 line_table = ggc_alloc<line_maps> ();
1197 linemap_init (line_table, BUILTINS_LOCATION);
1198 line_table->reallocator = realloc_for_line_map;
1199 line_table->round_alloc_size = ggc_round_alloc_size;
1200 init_ttree ();
1202 /* Initialize register usage now so switches may override. */
1203 init_reg_sets ();
1205 /* Register the language-independent parameters. */
1206 global_init_params ();
1208 /* This must be done after global_init_params but before argument
1209 processing. */
1210 init_ggc_heuristics ();
1212 /* Create the singleton holder for global state.
1213 Doing so also creates the pass manager and with it the passes. */
1214 g = new gcc::context ();
1215 symtab = ggc_cleared_alloc <symbol_table> ();
1217 statistics_early_init ();
1218 finish_params ();
1221 /* Return true if the current target supports -fsection-anchors. */
1223 static bool
1224 target_supports_section_anchors_p (void)
1226 if (targetm.min_anchor_offset == 0 && targetm.max_anchor_offset == 0)
1227 return false;
1229 if (targetm.asm_out.output_anchor == NULL)
1230 return false;
1232 return true;
1235 /* Default the align_* variables to 1 if they're still unset, and
1236 set up the align_*_log variables. */
1237 static void
1238 init_alignments (void)
1240 if (align_loops <= 0)
1241 align_loops = 1;
1242 if (align_loops_max_skip > align_loops)
1243 align_loops_max_skip = align_loops - 1;
1244 align_loops_log = floor_log2 (align_loops * 2 - 1);
1245 if (align_jumps <= 0)
1246 align_jumps = 1;
1247 if (align_jumps_max_skip > align_jumps)
1248 align_jumps_max_skip = align_jumps - 1;
1249 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1250 if (align_labels <= 0)
1251 align_labels = 1;
1252 align_labels_log = floor_log2 (align_labels * 2 - 1);
1253 if (align_labels_max_skip > align_labels)
1254 align_labels_max_skip = align_labels - 1;
1255 if (align_functions <= 0)
1256 align_functions = 1;
1257 align_functions_log = floor_log2 (align_functions * 2 - 1);
1260 /* Process the options that have been parsed. */
1261 static void
1262 process_options (void)
1264 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1265 This can happen with incorrect pre-processed input. */
1266 debug_hooks = &do_nothing_debug_hooks;
1268 maximum_field_alignment = initial_max_fld_align * BITS_PER_UNIT;
1270 /* Default to -fdiagnostics-color=auto if GCC_COLORS is in the environment,
1271 otherwise default to -fdiagnostics-color=never. */
1272 if (!global_options_set.x_flag_diagnostics_show_color
1273 && getenv ("GCC_COLORS"))
1274 pp_show_color (global_dc->printer)
1275 = colorize_init (DIAGNOSTICS_COLOR_AUTO);
1277 /* Allow the front end to perform consistency checks and do further
1278 initialization based on the command line options. This hook also
1279 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1280 so we can correctly initialize debug output. */
1281 no_backend = lang_hooks.post_options (&main_input_filename);
1283 /* Set default values for parameters relation to the Scalar Reduction
1284 of Aggregates passes (SRA and IP-SRA). We must do this here, rather
1285 than in opts.c:default_options_optimization as historically these
1286 tuning heuristics have been based on MOVE_RATIO, which on some
1287 targets requires other symbols from the backend. */
1288 maybe_set_param_value
1289 (PARAM_SRA_MAX_SCALARIZATION_SIZE_SPEED,
1290 get_move_ratio (true) * UNITS_PER_WORD,
1291 global_options.x_param_values, global_options_set.x_param_values);
1292 maybe_set_param_value
1293 (PARAM_SRA_MAX_SCALARIZATION_SIZE_SIZE,
1294 get_move_ratio (false) * UNITS_PER_WORD,
1295 global_options.x_param_values, global_options_set.x_param_values);
1297 /* Some machines may reject certain combinations of options. */
1298 targetm.target_option.override ();
1300 /* Avoid any informative notes in the second run of -fcompare-debug. */
1301 if (flag_compare_debug)
1302 diagnostic_inhibit_notes (global_dc);
1304 if (flag_section_anchors && !target_supports_section_anchors_p ())
1306 warning (OPT_fsection_anchors,
1307 "this target does not support %qs", "-fsection-anchors");
1308 flag_section_anchors = 0;
1311 if (flag_short_enums == 2)
1312 flag_short_enums = targetm.default_short_enums ();
1314 /* Set aux_base_name if not already set. */
1315 if (aux_base_name)
1317 else if (main_input_filename)
1319 char *name = xstrdup (lbasename (main_input_filename));
1321 strip_off_ending (name, strlen (name));
1322 aux_base_name = name;
1324 else
1325 aux_base_name = "gccaux";
1327 #ifndef HAVE_isl
1328 if (flag_graphite
1329 || flag_graphite_identity
1330 || flag_loop_block
1331 || flag_loop_interchange
1332 || flag_loop_strip_mine
1333 || flag_loop_parallelize_all)
1334 sorry ("Graphite loop optimizations cannot be used (ISL is not available)"
1335 "(-fgraphite, -fgraphite-identity, -floop-block, "
1336 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1337 "and -ftree-loop-linear)");
1338 #endif
1340 if (flag_check_pointer_bounds)
1342 if (targetm.chkp_bound_mode () == VOIDmode)
1343 error ("-fcheck-pointer-bounds is not supported for this target");
1346 /* One region RA really helps to decrease the code size. */
1347 if (flag_ira_region == IRA_REGION_AUTODETECT)
1348 flag_ira_region
1349 = optimize_size || !optimize ? IRA_REGION_ONE : IRA_REGION_MIXED;
1351 if (!abi_version_at_least (2))
1353 /* -fabi-version=1 support was removed after GCC 4.9. */
1354 error ("%<-fabi-version=1%> is no longer supported");
1355 flag_abi_version = 2;
1358 /* Unrolling all loops implies that standard loop unrolling must also
1359 be done. */
1360 if (flag_unroll_all_loops)
1361 flag_unroll_loops = 1;
1363 /* web and rename-registers help when run after loop unrolling. */
1364 if (flag_web == AUTODETECT_VALUE)
1365 flag_web = flag_unroll_loops || flag_peel_loops;
1367 if (flag_rename_registers == AUTODETECT_VALUE)
1368 flag_rename_registers = flag_unroll_loops || flag_peel_loops;
1370 if (flag_non_call_exceptions)
1371 flag_asynchronous_unwind_tables = 1;
1372 if (flag_asynchronous_unwind_tables)
1373 flag_unwind_tables = 1;
1375 if (flag_value_profile_transformations)
1376 flag_profile_values = 1;
1378 /* Warn about options that are not supported on this machine. */
1379 #ifndef INSN_SCHEDULING
1380 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1381 warning (0, "instruction scheduling not supported on this target machine");
1382 #endif
1383 #ifndef DELAY_SLOTS
1384 if (flag_delayed_branch)
1385 warning (0, "this target machine does not have delayed branches");
1386 #endif
1388 user_label_prefix = USER_LABEL_PREFIX;
1389 if (flag_leading_underscore != -1)
1391 /* If the default prefix is more complicated than "" or "_",
1392 issue a warning and ignore this option. */
1393 if (user_label_prefix[0] == 0 ||
1394 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1396 user_label_prefix = flag_leading_underscore ? "_" : "";
1398 else
1399 warning (0, "-f%sleading-underscore not supported on this target machine",
1400 flag_leading_underscore ? "" : "no-");
1403 /* If we are in verbose mode, write out the version and maybe all the
1404 option flags in use. */
1405 if (version_flag)
1407 print_version (stderr, "");
1408 if (! quiet_flag)
1409 print_switch_values (print_to_stderr);
1412 if (flag_syntax_only)
1414 write_symbols = NO_DEBUG;
1415 profile_flag = 0;
1418 if (flag_gtoggle)
1420 if (debug_info_level == DINFO_LEVEL_NONE)
1422 debug_info_level = DINFO_LEVEL_NORMAL;
1424 if (write_symbols == NO_DEBUG)
1425 write_symbols = PREFERRED_DEBUGGING_TYPE;
1427 else
1428 debug_info_level = DINFO_LEVEL_NONE;
1431 if (flag_dump_final_insns && !flag_syntax_only && !no_backend)
1433 FILE *final_output = fopen (flag_dump_final_insns, "w");
1434 if (!final_output)
1436 error ("could not open final insn dump file %qs: %m",
1437 flag_dump_final_insns);
1438 flag_dump_final_insns = NULL;
1440 else if (fclose (final_output))
1442 error ("could not close zeroed insn dump file %qs: %m",
1443 flag_dump_final_insns);
1444 flag_dump_final_insns = NULL;
1448 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1449 level is 0. */
1450 if (debug_info_level == DINFO_LEVEL_NONE)
1451 write_symbols = NO_DEBUG;
1453 if (write_symbols == NO_DEBUG)
1455 #if defined(DBX_DEBUGGING_INFO)
1456 else if (write_symbols == DBX_DEBUG)
1457 debug_hooks = &dbx_debug_hooks;
1458 #endif
1459 #if defined(XCOFF_DEBUGGING_INFO)
1460 else if (write_symbols == XCOFF_DEBUG)
1461 debug_hooks = &xcoff_debug_hooks;
1462 #endif
1463 #ifdef SDB_DEBUGGING_INFO
1464 else if (write_symbols == SDB_DEBUG)
1465 debug_hooks = &sdb_debug_hooks;
1466 #endif
1467 #ifdef DWARF2_DEBUGGING_INFO
1468 else if (write_symbols == DWARF2_DEBUG)
1469 debug_hooks = &dwarf2_debug_hooks;
1470 #endif
1471 #ifdef VMS_DEBUGGING_INFO
1472 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1473 debug_hooks = &vmsdbg_debug_hooks;
1474 #endif
1475 else
1476 error ("target system does not support the %qs debug format",
1477 debug_type_names[write_symbols]);
1479 /* We know which debug output will be used so we can set flag_var_tracking
1480 and flag_var_tracking_uninit if the user has not specified them. */
1481 if (debug_info_level < DINFO_LEVEL_NORMAL
1482 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
1484 if (flag_var_tracking == 1
1485 || flag_var_tracking_uninit == 1)
1487 if (debug_info_level < DINFO_LEVEL_NORMAL)
1488 warning (0, "variable tracking requested, but useless unless "
1489 "producing debug info");
1490 else
1491 warning (0, "variable tracking requested, but not supported "
1492 "by this debug format");
1494 flag_var_tracking = 0;
1495 flag_var_tracking_uninit = 0;
1498 /* The debug hooks are used to implement -fdump-go-spec because it
1499 gives a simple and stable API for all the information we need to
1500 dump. */
1501 if (flag_dump_go_spec != NULL)
1502 debug_hooks = dump_go_spec_init (flag_dump_go_spec, debug_hooks);
1504 /* If the user specifically requested variable tracking with tagging
1505 uninitialized variables, we need to turn on variable tracking.
1506 (We already determined above that variable tracking is feasible.) */
1507 if (flag_var_tracking_uninit == 1)
1508 flag_var_tracking = 1;
1510 if (flag_var_tracking == AUTODETECT_VALUE)
1511 flag_var_tracking = optimize >= 1;
1513 if (flag_var_tracking_uninit == AUTODETECT_VALUE)
1514 flag_var_tracking_uninit = flag_var_tracking;
1516 if (flag_var_tracking_assignments == AUTODETECT_VALUE)
1517 flag_var_tracking_assignments = flag_var_tracking
1518 && !(flag_selective_scheduling || flag_selective_scheduling2);
1520 if (flag_var_tracking_assignments_toggle)
1521 flag_var_tracking_assignments = !flag_var_tracking_assignments;
1523 if (flag_var_tracking_assignments && !flag_var_tracking)
1524 flag_var_tracking = flag_var_tracking_assignments = -1;
1526 if (flag_var_tracking_assignments
1527 && (flag_selective_scheduling || flag_selective_scheduling2))
1528 warning (0, "var-tracking-assignments changes selective scheduling");
1530 if (flag_tree_cselim == AUTODETECT_VALUE)
1531 #ifdef HAVE_conditional_move
1532 flag_tree_cselim = 1;
1533 #else
1534 flag_tree_cselim = 0;
1535 #endif
1537 /* If auxiliary info generation is desired, open the output file.
1538 This goes in the same directory as the source file--unlike
1539 all the other output files. */
1540 if (flag_gen_aux_info)
1542 aux_info_file = fopen (aux_info_file_name, "w");
1543 if (aux_info_file == 0)
1544 fatal_error ("can%'t open %s: %m", aux_info_file_name);
1547 if (!targetm_common.have_named_sections)
1549 if (flag_function_sections)
1551 warning (0, "-ffunction-sections not supported for this target");
1552 flag_function_sections = 0;
1554 if (flag_data_sections)
1556 warning (0, "-fdata-sections not supported for this target");
1557 flag_data_sections = 0;
1561 #ifndef HAVE_prefetch
1562 if (flag_prefetch_loop_arrays > 0)
1564 warning (0, "-fprefetch-loop-arrays not supported for this target");
1565 flag_prefetch_loop_arrays = 0;
1567 #else
1568 if (flag_prefetch_loop_arrays > 0 && !HAVE_prefetch)
1570 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1571 flag_prefetch_loop_arrays = 0;
1573 #endif
1575 /* This combination of options isn't handled for i386 targets and doesn't
1576 make much sense anyway, so don't allow it. */
1577 if (flag_prefetch_loop_arrays > 0 && optimize_size)
1579 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1580 flag_prefetch_loop_arrays = 0;
1583 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1584 if (flag_signaling_nans)
1585 flag_trapping_math = 1;
1587 /* We cannot reassociate if we want traps or signed zeros. */
1588 if (flag_associative_math && (flag_trapping_math || flag_signed_zeros))
1590 warning (0, "-fassociative-math disabled; other options take precedence");
1591 flag_associative_math = 0;
1594 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1595 if (flag_cx_limited_range)
1596 flag_complex_method = 0;
1598 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1599 if (flag_cx_fortran_rules)
1600 flag_complex_method = 1;
1602 /* Targets must be able to place spill slots at lower addresses. If the
1603 target already uses a soft frame pointer, the transition is trivial. */
1604 if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
1606 warning (0, "-fstack-protector not supported for this target");
1607 flag_stack_protect = 0;
1609 if (!flag_stack_protect)
1610 warn_stack_protect = 0;
1612 /* Address Sanitizer needs porting to each target architecture. */
1614 if ((flag_sanitize & SANITIZE_ADDRESS)
1615 && !FRAME_GROWS_DOWNWARD)
1617 warning (0,
1618 "-fsanitize=address and -fsanitize=kernel-address "
1619 "are not supported for this target");
1620 flag_sanitize &= ~SANITIZE_ADDRESS;
1623 if ((flag_sanitize & SANITIZE_USER_ADDRESS)
1624 && targetm.asan_shadow_offset == NULL)
1626 warning (0, "-fsanitize=address not supported for this target");
1627 flag_sanitize &= ~SANITIZE_ADDRESS;
1630 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1631 have not been set. */
1632 if (!global_options_set.x_warnings_are_errors
1633 && warn_coverage_mismatch
1634 && (global_dc->classify_diagnostic[OPT_Wcoverage_mismatch] ==
1635 DK_UNSPECIFIED))
1636 diagnostic_classify_diagnostic (global_dc, OPT_Wcoverage_mismatch,
1637 DK_ERROR, UNKNOWN_LOCATION);
1639 /* Save the current optimization options. */
1640 optimization_default_node = build_optimization_node (&global_options);
1641 optimization_current_node = optimization_default_node;
1644 /* This function can be called multiple times to reinitialize the compiler
1645 back end when register classes or instruction sets have changed,
1646 before each function. */
1647 static void
1648 backend_init_target (void)
1650 /* Initialize alignment variables. */
1651 init_alignments ();
1653 /* This depends on stack_pointer_rtx. */
1654 init_fake_stack_mems ();
1656 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1657 mode-dependent. */
1658 init_alias_target ();
1660 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1661 init_reload ();
1663 /* Depends on the enabled attribute. */
1664 recog_init ();
1666 /* The following initialization functions need to generate rtl, so
1667 provide a dummy function context for them. */
1668 init_dummy_function_start ();
1670 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1671 on a mode change. */
1672 init_expmed ();
1673 init_lower_subreg ();
1674 init_set_costs ();
1676 init_expr_target ();
1677 ira_init ();
1679 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1680 after a mode change as well. */
1681 caller_save_initialized_p = false;
1683 expand_dummy_function_end ();
1686 /* Initialize the compiler back end. This function is called only once,
1687 when starting the compiler. */
1688 static void
1689 backend_init (void)
1691 init_emit_once ();
1693 init_rtlanal ();
1694 init_inline_once ();
1695 init_varasm_once ();
1696 save_register_info ();
1698 /* Middle end needs this initialization for default mem attributes
1699 used by early calls to make_decl_rtl. */
1700 init_emit_regs ();
1702 /* Middle end needs this initialization for mode tables used to assign
1703 modes to vector variables. */
1704 init_regs ();
1707 /* Initialize excess precision settings. */
1708 static void
1709 init_excess_precision (void)
1711 /* Adjust excess precision handling based on the target options. If
1712 the front end cannot handle it, flag_excess_precision_cmdline
1713 will already have been set accordingly in the post_options
1714 hook. */
1715 gcc_assert (flag_excess_precision_cmdline != EXCESS_PRECISION_DEFAULT);
1716 flag_excess_precision = flag_excess_precision_cmdline;
1717 if (flag_unsafe_math_optimizations)
1718 flag_excess_precision = EXCESS_PRECISION_FAST;
1719 if (flag_excess_precision == EXCESS_PRECISION_STANDARD)
1721 int flt_eval_method = TARGET_FLT_EVAL_METHOD;
1722 switch (flt_eval_method)
1724 case -1:
1725 case 0:
1726 /* Either the target acts unpredictably (-1) or has all the
1727 operations required not to have excess precision (0). */
1728 flag_excess_precision = EXCESS_PRECISION_FAST;
1729 break;
1730 case 1:
1731 case 2:
1732 /* In these cases, predictable excess precision makes
1733 sense. */
1734 break;
1735 default:
1736 /* Any other implementation-defined FLT_EVAL_METHOD values
1737 require the compiler to handle the associated excess
1738 precision rules in excess_precision_type. */
1739 gcc_unreachable ();
1744 /* Initialize things that are both lang-dependent and target-dependent.
1745 This function can be called more than once if target parameters change. */
1746 static void
1747 lang_dependent_init_target (void)
1749 /* This determines excess precision settings. */
1750 init_excess_precision ();
1752 /* This creates various _DECL nodes, so needs to be called after the
1753 front end is initialized. It also depends on the HAVE_xxx macros
1754 generated from the target machine description. */
1755 init_optabs ();
1757 gcc_assert (!this_target_rtl->target_specific_initialized);
1760 /* Perform initializations that are lang-dependent or target-dependent.
1761 but matters only for late optimizations and RTL generation. */
1763 static int rtl_initialized;
1765 void
1766 initialize_rtl (void)
1768 /* Initialization done just once per compilation, but delayed
1769 till code generation. */
1770 if (!rtl_initialized)
1771 ira_init_once ();
1772 rtl_initialized = true;
1774 /* Target specific RTL backend initialization. */
1775 if (!this_target_rtl->target_specific_initialized)
1777 backend_init_target ();
1778 this_target_rtl->target_specific_initialized = true;
1782 /* Language-dependent initialization. Returns nonzero on success. */
1783 static int
1784 lang_dependent_init (const char *name)
1786 location_t save_loc = input_location;
1787 if (dump_base_name == 0)
1788 dump_base_name = name && name[0] ? name : "gccdump";
1790 /* Other front-end initialization. */
1791 input_location = BUILTINS_LOCATION;
1792 if (lang_hooks.init () == 0)
1793 return 0;
1794 input_location = save_loc;
1796 if (!flag_wpa)
1798 init_asm_output (name);
1800 /* If stack usage information is desired, open the output file. */
1801 if (flag_stack_usage)
1802 stack_usage_file = open_auxiliary_file ("su");
1805 /* This creates various _DECL nodes, so needs to be called after the
1806 front end is initialized. */
1807 init_eh ();
1809 /* Do the target-specific parts of the initialization. */
1810 lang_dependent_init_target ();
1812 if (!flag_wpa)
1814 /* If dbx symbol table desired, initialize writing it and output the
1815 predefined types. */
1816 timevar_push (TV_SYMOUT);
1818 /* Now we have the correct original filename, we can initialize
1819 debug output. */
1820 (*debug_hooks->init) (name);
1822 timevar_pop (TV_SYMOUT);
1825 return 1;
1829 /* Reinitialize everything when target parameters, such as register usage,
1830 have changed. */
1831 void
1832 target_reinit (void)
1834 struct rtl_data saved_x_rtl;
1835 rtx *saved_regno_reg_rtx;
1836 tree saved_optimization_current_node;
1837 struct target_optabs *saved_this_fn_optabs;
1839 /* Temporarily switch to the default optimization node, so that
1840 *this_target_optabs is set to the default, not reflecting
1841 whatever a previous function used for the optimize
1842 attribute. */
1843 saved_optimization_current_node = optimization_current_node;
1844 saved_this_fn_optabs = this_fn_optabs;
1845 if (saved_optimization_current_node != optimization_default_node)
1847 optimization_current_node = optimization_default_node;
1848 cl_optimization_restore
1849 (&global_options,
1850 TREE_OPTIMIZATION (optimization_default_node));
1852 this_fn_optabs = this_target_optabs;
1854 /* Save *crtl and regno_reg_rtx around the reinitialization
1855 to allow target_reinit being called even after prepare_function_start. */
1856 saved_regno_reg_rtx = regno_reg_rtx;
1857 if (saved_regno_reg_rtx)
1859 saved_x_rtl = *crtl;
1860 memset (crtl, '\0', sizeof (*crtl));
1861 regno_reg_rtx = NULL;
1864 this_target_rtl->target_specific_initialized = false;
1866 /* This initializes hard_frame_pointer, and calls init_reg_modes_target()
1867 to initialize reg_raw_mode[]. */
1868 init_emit_regs ();
1870 /* This invokes target hooks to set fixed_reg[] etc, which is
1871 mode-dependent. */
1872 init_regs ();
1874 /* Reinitialize lang-dependent parts. */
1875 lang_dependent_init_target ();
1877 /* Restore the original optimization node. */
1878 if (saved_optimization_current_node != optimization_default_node)
1880 optimization_current_node = saved_optimization_current_node;
1881 cl_optimization_restore (&global_options,
1882 TREE_OPTIMIZATION (optimization_current_node));
1884 this_fn_optabs = saved_this_fn_optabs;
1886 /* Restore regno_reg_rtx at the end, as free_after_compilation from
1887 expand_dummy_function_end clears it. */
1888 if (saved_regno_reg_rtx)
1890 *crtl = saved_x_rtl;
1891 regno_reg_rtx = saved_regno_reg_rtx;
1892 saved_regno_reg_rtx = NULL;
1896 void
1897 dump_memory_report (bool final)
1899 dump_line_table_statistics ();
1900 ggc_print_statistics ();
1901 stringpool_statistics ();
1902 dump_tree_statistics ();
1903 dump_gimple_statistics ();
1904 dump_rtx_statistics ();
1905 dump_alloc_pool_statistics ();
1906 dump_bitmap_statistics ();
1907 dump_vec_loc_statistics ();
1908 dump_ggc_loc_statistics (final);
1909 dump_alias_stats (stderr);
1910 dump_pta_stats (stderr);
1913 /* Clean up: close opened files, etc. */
1915 static void
1916 finalize (bool no_backend)
1918 /* Close the dump files. */
1919 if (flag_gen_aux_info)
1921 fclose (aux_info_file);
1922 if (seen_error ())
1923 unlink (aux_info_file_name);
1926 /* Close non-debugging input and output files. Take special care to note
1927 whether fclose returns an error, since the pages might still be on the
1928 buffer chain while the file is open. */
1930 if (asm_out_file)
1932 if (ferror (asm_out_file) != 0)
1933 fatal_error ("error writing to %s: %m", asm_file_name);
1934 if (fclose (asm_out_file) != 0)
1935 fatal_error ("error closing %s: %m", asm_file_name);
1938 if (stack_usage_file)
1939 fclose (stack_usage_file);
1941 if (!no_backend)
1943 statistics_fini ();
1945 g->get_passes ()->finish_optimization_passes ();
1947 lra_finish_once ();
1950 if (mem_report)
1951 dump_memory_report (true);
1953 if (profile_report)
1954 dump_profile_report ();
1956 /* Language-specific end of compilation actions. */
1957 lang_hooks.finish ();
1960 static bool
1961 standard_type_bitsize (int bitsize)
1963 /* As a special exception, we always want __int128 enabled if possible. */
1964 if (bitsize == 128)
1965 return false;
1966 if (bitsize == CHAR_TYPE_SIZE
1967 || bitsize == SHORT_TYPE_SIZE
1968 || bitsize == INT_TYPE_SIZE
1969 || bitsize == LONG_TYPE_SIZE
1970 || bitsize == LONG_LONG_TYPE_SIZE)
1971 return true;
1972 return false;
1975 /* Initialize the compiler, and compile the input file. */
1976 static void
1977 do_compile ()
1979 process_options ();
1981 /* Don't do any more if an error has already occurred. */
1982 if (!seen_error ())
1984 int i;
1986 timevar_start (TV_PHASE_SETUP);
1988 /* This must be run always, because it is needed to compute the FP
1989 predefined macros, such as __LDBL_MAX__, for targets using non
1990 default FP formats. */
1991 init_adjust_machine_modes ();
1992 init_derived_machine_modes ();
1994 /* This must happen after the backend has a chance to process
1995 command line options, but before the parsers are
1996 initialized. */
1997 for (i = 0; i < NUM_INT_N_ENTS; i ++)
1998 if (targetm.scalar_mode_supported_p (int_n_data[i].m)
1999 && ! standard_type_bitsize (int_n_data[i].bitsize))
2000 int_n_enabled_p[i] = true;
2001 else
2002 int_n_enabled_p[i] = false;
2004 /* Set up the back-end if requested. */
2005 if (!no_backend)
2006 backend_init ();
2008 /* Language-dependent initialization. Returns true on success. */
2009 if (lang_dependent_init (main_input_filename))
2011 /* Initialize yet another pass. */
2013 ggc_protect_identifiers = true;
2015 symtab->initialize ();
2016 init_final (main_input_filename);
2017 coverage_init (aux_base_name);
2018 statistics_init ();
2019 invoke_plugin_callbacks (PLUGIN_START_UNIT, NULL);
2021 timevar_stop (TV_PHASE_SETUP);
2023 compile_file ();
2025 else
2027 timevar_stop (TV_PHASE_SETUP);
2030 timevar_start (TV_PHASE_FINALIZE);
2032 finalize (no_backend);
2034 timevar_stop (TV_PHASE_FINALIZE);
2038 toplev::toplev (bool use_TV_TOTAL)
2039 : m_use_TV_TOTAL (use_TV_TOTAL)
2041 if (!m_use_TV_TOTAL)
2042 start_timevars ();
2045 toplev::~toplev ()
2047 timevar_stop (TV_TOTAL);
2048 timevar_print (stderr);
2051 void
2052 toplev::start_timevars ()
2054 if (time_report || !quiet_flag || flag_detailed_statistics)
2055 timevar_init ();
2057 timevar_start (TV_TOTAL);
2060 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2061 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2062 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2064 It is not safe to call this function more than once. */
2067 toplev::main (int argc, char **argv)
2069 /* Parsing and gimplification sometimes need quite large stack.
2070 Increase stack size limits if possible. */
2071 stack_limit_increase (64 * 1024 * 1024);
2073 expandargv (&argc, &argv);
2075 /* Initialization of GCC's environment, and diagnostics. */
2076 general_init (argv[0]);
2078 /* One-off initialization of options that does not need to be
2079 repeated when options are added for particular functions. */
2080 init_options_once ();
2082 /* Initialize global options structures; this must be repeated for
2083 each structure used for parsing options. */
2084 init_options_struct (&global_options, &global_options_set);
2085 lang_hooks.init_options_struct (&global_options);
2087 /* Convert the options to an array. */
2088 decode_cmdline_options_to_array_default_mask (argc,
2089 CONST_CAST2 (const char **,
2090 char **, argv),
2091 &save_decoded_options,
2092 &save_decoded_options_count);
2094 /* Perform language-specific options initialization. */
2095 lang_hooks.init_options (save_decoded_options_count, save_decoded_options);
2097 /* Parse the options and do minimal processing; basically just
2098 enough to default flags appropriately. */
2099 decode_options (&global_options, &global_options_set,
2100 save_decoded_options, save_decoded_options_count,
2101 UNKNOWN_LOCATION, global_dc);
2103 handle_common_deferred_options ();
2105 init_local_tick ();
2107 initialize_plugins ();
2109 if (version_flag)
2110 print_version (stderr, "");
2112 if (help_flag)
2113 print_plugins_help (stderr, "");
2115 /* Exit early if we can (e.g. -help). */
2116 if (!exit_after_options)
2118 if (m_use_TV_TOTAL)
2119 start_timevars ();
2120 do_compile ();
2123 if (warningcount || errorcount || werrorcount)
2124 print_ignored_options ();
2126 /* Invoke registered plugin callbacks if any. Some plugins could
2127 emit some diagnostics here. */
2128 invoke_plugin_callbacks (PLUGIN_FINISH, NULL);
2130 diagnostic_finish (global_dc);
2132 finalize_plugins ();
2133 location_adhoc_data_fini (line_table);
2134 if (seen_error () || werrorcount)
2135 return (FATAL_EXIT_CODE);
2137 return (SUCCESS_EXIT_CODE);
2140 /* For those that want to, this function aims to clean up enough state that
2141 you can call toplev::main again. */
2142 void
2143 toplev::finalize (void)
2145 rtl_initialized = false;
2146 this_target_rtl->target_specific_initialized = false;
2148 cgraph_c_finalize ();
2149 cgraphunit_c_finalize ();
2150 dwarf2out_c_finalize ();
2151 gcse_c_finalize ();
2152 ipa_cp_c_finalize ();
2153 ipa_reference_c_finalize ();
2154 params_c_finalize ();