1 /* Top level of GCC compilers (cc1, cc1plus, etc.)
2 Copyright (C) 1987-2016 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
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
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. */
27 #include "coretypes.h"
33 #include "alloc-pool.h"
36 #include "optabs-libfuncs.h"
37 #include "insn-config.h"
42 #include "diagnostic.h"
44 #include "tree-inline.h"
45 #include "realmpfr.h" /* For GMP/MPFR/MPC versions, in print_version. */
48 #include "insn-attr.h"
53 #include "tree-diagnostic.h"
57 #include "dwarf2asm.h"
59 #include "common/common-target.h"
60 #include "langhooks.h"
61 #include "cfgloop.h" /* for init_set_costs */
62 #include "hosthooks.h"
64 #include "opts-diagnostic.h"
70 #include "pass_manager.h"
71 #include "auto-profile.h"
72 #include "dwarf2out.h"
73 #include "ipa-reference.h"
74 #include "symbol-summary.h"
77 #include "tree-chkp.h"
81 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
87 #ifdef XCOFF_DEBUGGING_INFO
88 #include "xcoffout.h" /* Needed for external data declarations. */
91 static void general_init (const char *, bool);
92 static void do_compile ();
93 static void process_options (void);
94 static void backend_init (void);
95 static int lang_dependent_init (const char *);
96 static void init_asm_output (const char *);
97 static void finalize (bool);
99 static void crash_signal (int) ATTRIBUTE_NORETURN;
100 static void compile_file (void);
102 /* True if we don't need a backend (e.g. preprocessing only). */
103 static bool no_backend;
105 /* True if processing constexpr declaration.
106 Could not be use to verify function declaration.
107 Only usable for constexpr pointer.
109 constexpr unsigned *pointer = ptr + index. */
110 bool processing_constexpr_decl = false;
112 /* Length of line when printing switch values. */
115 /* Decoded options, and number of such options. */
116 struct cl_decoded_option *save_decoded_options;
117 unsigned int save_decoded_options_count;
119 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
120 to optimize in process_options (). */
121 #define AUTODETECT_VALUE 2
123 /* Debug hooks - dependent upon command line options. */
125 const struct gcc_debug_hooks *debug_hooks;
127 /* The FUNCTION_DECL for the function currently being compiled,
128 or 0 if between functions. */
129 tree current_function_decl;
131 /* Set to the FUNC_BEGIN label of the current function, or NULL
133 const char * current_function_func_begin_label;
135 /* A random sequence of characters, unless overridden by user. */
136 static const char *flag_random_seed;
138 /* A local time stamp derived from the time of compilation. It will be
139 zero if the system cannot provide a time. It will be -1u, if the
140 user has specified a particular random seed. */
143 /* Random number for this compilation */
144 HOST_WIDE_INT random_seed;
148 /* When non-NULL, indicates that whenever space is allocated on the
149 stack, the resulting stack pointer must not pass this
150 address---that is, for stacks that grow downward, the stack pointer
151 must always be greater than or equal to this address; for stacks
152 that grow upward, the stack pointer must be less than this address.
153 At present, the rtx may be either a REG or a SYMBOL_REF, although
154 the support provided depends on the backend. */
157 /* True if the user has tagged the function with the 'section'
160 bool user_defined_section_attribute = false;
162 struct target_flag_state default_target_flag_state;
163 #if SWITCHABLE_TARGET
164 struct target_flag_state *this_target_flag_state = &default_target_flag_state;
166 #define this_target_flag_state (&default_target_flag_state)
169 /* The user symbol prefix after having resolved same. */
170 const char *user_label_prefix;
172 /* Output files for assembler code (real compiler output)
173 and debugging dumps. */
177 FILE *stack_usage_file = NULL;
179 /* The current working directory of a translation. It's generally the
180 directory from which compilation was initiated, but a preprocessed
181 file may specify the original directory in which it was
184 static const char *src_pwd;
186 /* Initialize src_pwd with the given string, and return true. If it
187 was already initialized, return false. As a special case, it may
188 be called with a NULL argument to test whether src_pwd has NOT been
192 set_src_pwd (const char *pwd)
196 if (strcmp (src_pwd, pwd) == 0)
202 src_pwd = xstrdup (pwd);
206 /* Return the directory from which the translation unit was initiated,
207 in case set_src_pwd() was not called before to assign it a
223 /* Called when the start of a function definition is parsed,
224 this function prints on stderr the name of the function. */
226 announce_function (tree decl)
230 if (rtl_dump_and_exit)
231 fprintf (stderr, "%s ",
232 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl))));
234 fprintf (stderr, " %s",
235 identifier_to_locale (lang_hooks.decl_printable_name (decl, 2)));
237 pp_needs_newline (global_dc->printer) = true;
238 diagnostic_set_last_function (global_dc, (diagnostic_info *) NULL);
242 /* Initialize local_tick with a random number or -1 if
243 flag_random_seed is set. */
246 init_local_tick (void)
248 if (!flag_random_seed)
250 /* Try urandom first. Time of day is too likely to collide.
251 In case of any error we just use the local tick. */
253 int fd = open ("/dev/urandom", O_RDONLY);
256 if (read (fd, &random_seed, sizeof (random_seed))
257 != sizeof (random_seed))
262 /* Now get the tick anyways */
263 #ifdef HAVE_GETTIMEOFDAY
267 gettimeofday (&tv, NULL);
268 local_tick = (unsigned) tv.tv_sec * 1000 + tv.tv_usec / 1000;
272 time_t now = time (NULL);
274 if (now != (time_t)-1)
275 local_tick = (unsigned) now;
283 /* Set up a default flag_random_seed and local_tick, unless the user
284 already specified one. Must be called after init_local_tick. */
287 init_random_seed (void)
290 random_seed = local_tick ^ getpid (); /* Old racey fallback method */
293 /* Obtain the random_seed. Unless NOINIT, initialize it if
294 it's not provided in the command line. */
297 get_random_seed (bool noinit)
299 if (!flag_random_seed && !noinit)
304 /* Modify the random_seed string to VAL. Return its previous
308 set_random_seed (const char *val)
310 const char *old = flag_random_seed;
311 flag_random_seed = val;
312 if (flag_random_seed)
316 /* When the driver passed in a hex number don't crc it again */
317 random_seed = strtoul (flag_random_seed, &endp, 0);
318 if (!(endp > flag_random_seed && *endp == 0))
319 random_seed = crc32_string (0, flag_random_seed);
324 /* Handler for fatal signals, such as SIGSEGV. These are transformed
325 into ICE messages, which is much more user friendly. In case the
326 error printer crashes, reset the signal to prevent infinite recursion. */
329 crash_signal (int signo)
331 signal (signo, SIG_DFL);
333 /* If we crashed while processing an ASM statement, then be a little more
334 graceful. It's most likely the user's fault. */
335 if (this_is_asm_operands)
337 output_operand_lossage ("unrecoverable error");
338 exit (FATAL_EXIT_CODE);
341 internal_error ("%s", strsignal (signo));
344 /* A subroutine of wrapup_global_declarations. We've come to the end of
345 the compilation unit. All deferred variables should be undeferred,
346 and all incomplete decls should be finalized. */
349 wrapup_global_declaration_1 (tree decl)
351 /* We're not deferring this any longer. Assignment is conditional to
352 avoid needlessly dirtying PCH pages. */
353 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl), TS_DECL_WITH_VIS)
354 && DECL_DEFER_OUTPUT (decl) != 0)
355 DECL_DEFER_OUTPUT (decl) = 0;
357 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
358 lang_hooks.finish_incomplete_decl (decl);
361 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
362 needs to be output. Return true if it is output. */
365 wrapup_global_declaration_2 (tree decl)
367 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl)
368 || (TREE_CODE (decl) == VAR_DECL && DECL_HAS_VALUE_EXPR_P (decl)))
371 /* Don't write out static consts, unless we still need them.
373 We also keep static consts if not optimizing (for debugging),
374 unless the user specified -fno-keep-static-consts.
375 ??? They might be better written into the debug information.
376 This is possible when using DWARF.
378 A language processor that wants static constants to be always
379 written out (even if it is not used) is responsible for
380 calling rest_of_decl_compilation itself. E.g. the C front-end
381 calls rest_of_decl_compilation from finish_decl.
382 One motivation for this is that is conventional in some
383 environments to write things like:
384 static const char rcsid[] = "... version string ...";
385 intending to force the string to be in the executable.
387 A language processor that would prefer to have unneeded
388 static constants "optimized away" would just defer writing
389 them out until here. E.g. C++ does this, because static
390 constants are often defined in header files.
392 ??? A tempting alternative (for both C and C++) would be
393 to force a constant to be written if and only if it is
394 defined in a main file, as opposed to an include file. */
396 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
400 node = varpool_node::get (decl);
402 if (!node && flag_ltrans)
404 else if (node && node->definition)
406 else if (node && node->alias)
408 else if (!symtab->global_info_ready
410 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
412 else if (node && node->analyzed)
414 else if (DECL_COMDAT (decl))
416 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
417 && (optimize || !flag_keep_static_consts
418 || DECL_ARTIFICIAL (decl)))
423 rest_of_decl_compilation (decl, 1, 1);
431 /* Do any final processing required for the declarations in VEC, of
432 which there are LEN. We write out inline functions and variables
433 that have been deferred until this point, but which are required.
434 Returns nonzero if anything was put out. */
437 wrapup_global_declarations (tree *vec, int len)
439 bool reconsider, output_something = false;
442 for (i = 0; i < len; i++)
443 wrapup_global_declaration_1 (vec[i]);
445 /* Now emit any global variables or functions that we have been
446 putting off. We need to loop in case one of the things emitted
447 here references another one which comes earlier in the list. */
451 for (i = 0; i < len; i++)
452 reconsider |= wrapup_global_declaration_2 (vec[i]);
454 output_something = true;
458 return output_something;
461 /* Compile an entire translation unit. Write a file of assembly
462 output and various debugging dumps. */
467 timevar_start (TV_PHASE_PARSING);
468 timevar_push (TV_PARSE_GLOBAL);
470 /* Parse entire file and generate initial debug information. */
471 lang_hooks.parse_file ();
473 timevar_pop (TV_PARSE_GLOBAL);
474 timevar_stop (TV_PHASE_PARSING);
476 if (flag_dump_locations)
477 dump_location_info (stderr);
479 /* Compilation is now finished except for writing
480 what's left of the symbol table output. */
482 if (flag_syntax_only || flag_wpa)
485 /* Reset maximum_field_alignment, it can be adjusted by #pragma pack
486 and this shouldn't influence any types built by the middle-end
487 from now on (like gcov_info_type). */
488 maximum_field_alignment = initial_max_fld_align * BITS_PER_UNIT;
490 ggc_protect_identifiers = false;
492 /* Run the actual compilation process. */
495 timevar_start (TV_PHASE_OPT_GEN);
496 symtab->finalize_compilation_unit ();
497 timevar_stop (TV_PHASE_OPT_GEN);
500 /* Perform any post compilation-proper parser cleanups and
501 processing. This is currently only needed for the C++ parser,
502 which can be hopefully cleaned up so this hook is no longer
504 if (lang_hooks.decls.post_compilation_parsing_cleanups)
505 lang_hooks.decls.post_compilation_parsing_cleanups ();
510 timevar_start (TV_PHASE_LATE_ASM);
512 /* Compilation unit is finalized. When producing non-fat LTO object, we are
513 basically finished. */
514 if (in_lto_p || !flag_lto || flag_fat_lto_objects)
516 /* File-scope initialization for AddressSanitizer. */
517 if (flag_sanitize & SANITIZE_ADDRESS)
520 if (flag_sanitize & SANITIZE_THREAD)
524 & (SANITIZE_EFFICIENCY_WORKING_SET | SANITIZE_EFFICIENCY_CACHE_FRAG))
527 if (flag_check_pointer_bounds)
534 output_shared_constant_pool ();
535 output_object_blocks ();
536 finish_tm_clone_pairs ();
538 /* Write out any pending weak symbol declarations. */
541 /* This must be at the end before unwind and debug info.
542 Some target ports emit PIC setup thunks here. */
543 targetm.asm_out.code_end ();
545 /* Do dbx symbols. */
546 timevar_push (TV_SYMOUT);
548 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
549 if (dwarf2out_do_frame ())
550 dwarf2out_frame_finish ();
553 (*debug_hooks->finish) (main_input_filename);
554 timevar_pop (TV_SYMOUT);
556 /* Output some stuff at end of file if nec. */
558 dw2_output_indirect_constants ();
560 /* Flush any pending external directives. */
561 process_pending_assemble_externals ();
564 /* Emit LTO marker if LTO info has been previously emitted. This is
565 used by collect2 to determine whether an object file contains IL.
566 We used to emit an undefined reference here, but this produces
567 link errors if an object file with IL is stored into a shared
568 library without invoking lto1. */
569 if (flag_generate_lto || flag_generate_offload)
571 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
572 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
574 (unsigned HOST_WIDE_INT) 1, 8);
575 #elif defined ASM_OUTPUT_ALIGNED_COMMON
576 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_v1",
577 (unsigned HOST_WIDE_INT) 1, 8);
579 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_v1",
580 (unsigned HOST_WIDE_INT) 1,
581 (unsigned HOST_WIDE_INT) 1);
585 /* Let linker plugin know that this is a slim object and must be LTOed
586 even when user did not ask for it. */
587 if (flag_generate_lto && !flag_fat_lto_objects)
589 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
590 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE, "__gnu_lto_slim",
591 (unsigned HOST_WIDE_INT) 1, 8);
592 #elif defined ASM_OUTPUT_ALIGNED_COMMON
593 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_slim",
594 (unsigned HOST_WIDE_INT) 1, 8);
596 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_slim",
597 (unsigned HOST_WIDE_INT) 1,
598 (unsigned HOST_WIDE_INT) 1);
602 /* Attach a special .ident directive to the end of the file to identify
603 the version of GCC which compiled this code. The format of the .ident
604 string is patterned after the ones produced by native SVR4 compilers. */
607 const char *pkg_version = "(GNU) ";
610 if (strcmp ("(GCC) ", pkgversion_string))
611 pkg_version = pkgversion_string;
613 ident_str = ACONCAT (("GCC: ", pkg_version, version_string, NULL));
614 targetm.asm_out.output_ident (ident_str);
617 /* Auto profile finalization. */
618 if (flag_auto_profile)
621 /* Invoke registered plugin callbacks. */
622 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT, NULL);
624 /* This must be at the end. Some target ports emit end of file directives
625 into the assembly file here, and hence we can not output anything to the
626 assembly file after this point. */
627 targetm.asm_out.file_end ();
629 timevar_stop (TV_PHASE_LATE_ASM);
632 /* Print version information to FILE.
633 Each line begins with INDENT (for the case where FILE is the
634 assembler output file).
636 If SHOW_GLOBAL_STATE is true (for cc1 etc), we are within the compiler
637 proper and can print pertinent state (e.g. params and plugins).
639 If SHOW_GLOBAL_STATE is false (for use by libgccjit), we are outside the
640 compiler, and we don't hold the mutex on the compiler's global state:
641 we can't print params and plugins, since they might not be initialized,
642 or might be being manipulated by a compile running in another
646 print_version (FILE *file, const char *indent, bool show_global_state)
648 static const char fmt1[] =
650 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
652 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
655 static const char fmt2[] =
656 N_("GMP version %s, MPFR version %s, MPC version %s, isl version %s\n");
657 static const char fmt3[] =
658 N_("%s%swarning: %s header version %s differs from library version %s.\n");
659 static const char fmt4[] =
660 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
662 #define __VERSION__ "[?]"
665 file == stderr ? _(fmt1) : fmt1,
666 indent, *indent != 0 ? " " : "",
667 lang_hooks.name, pkgversion_string, version_string, TARGET_NAME,
668 indent, __VERSION__);
670 /* We need to stringify the GMP macro values. Ugh, gmp_version has
671 two string formats, "i.j.k" and "i.j" when k is zero. As of
672 gmp-4.3.0, GMP always uses the 3 number format. */
673 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
674 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3 (X)
675 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
676 #define GCC_GMP_VERSION \
677 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
678 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
679 #define GCC_GMP_STRINGIFY_VERSION \
680 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
681 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR)
683 #define GCC_GMP_STRINGIFY_VERSION \
684 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
685 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR) "." \
686 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_PATCHLEVEL)
689 file == stderr ? _(fmt2) : fmt2,
690 GCC_GMP_STRINGIFY_VERSION, MPFR_VERSION_STRING, MPC_VERSION_STRING,
693 #elif HAVE_ISL_OPTIONS_SET_SCHEDULE_SERIALIZE_SCCS
699 if (strcmp (GCC_GMP_STRINGIFY_VERSION, gmp_version))
701 file == stderr ? _(fmt3) : fmt3,
702 indent, *indent != 0 ? " " : "",
703 "GMP", GCC_GMP_STRINGIFY_VERSION, gmp_version);
704 if (strcmp (MPFR_VERSION_STRING, mpfr_get_version ()))
706 file == stderr ? _(fmt3) : fmt3,
707 indent, *indent != 0 ? " " : "",
708 "MPFR", MPFR_VERSION_STRING, mpfr_get_version ());
709 if (strcmp (MPC_VERSION_STRING, mpc_get_version ()))
711 file == stderr ? _(fmt3) : fmt3,
712 indent, *indent != 0 ? " " : "",
713 "MPC", MPC_VERSION_STRING, mpc_get_version ());
715 if (show_global_state)
718 file == stderr ? _(fmt4) : fmt4,
719 indent, *indent != 0 ? " " : "",
720 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
722 print_plugins_versions (file, indent);
727 print_to_asm_out_file (print_switch_type type, const char * text)
729 bool prepend_sep = true;
733 case SWITCH_TYPE_LINE_END:
734 putc ('\n', asm_out_file);
737 case SWITCH_TYPE_LINE_START:
738 fputs (ASM_COMMENT_START, asm_out_file);
739 return strlen (ASM_COMMENT_START);
741 case SWITCH_TYPE_DESCRIPTIVE:
742 if (ASM_COMMENT_START[0] == 0)
745 case SWITCH_TYPE_PASSED:
746 case SWITCH_TYPE_ENABLED:
748 fputc (' ', asm_out_file);
749 fputs (text, asm_out_file);
750 /* No need to return the length here as
751 print_single_switch has already done it. */
760 print_to_stderr (print_switch_type type, const char * text)
764 case SWITCH_TYPE_LINE_END:
768 case SWITCH_TYPE_LINE_START:
771 case SWITCH_TYPE_PASSED:
772 case SWITCH_TYPE_ENABLED:
776 case SWITCH_TYPE_DESCRIPTIVE:
777 fputs (text, stderr);
778 /* No need to return the length here as
779 print_single_switch has already done it. */
787 /* Print an option value and return the adjusted position in the line.
788 ??? print_fn doesn't handle errors, eg disk full; presumably other
789 code will catch a disk full though. */
792 print_single_switch (print_switch_fn_type print_fn,
794 print_switch_type type,
797 /* The ultrix fprintf returns 0 on success, so compute the result
798 we want here since we need it for the following test. The +1
799 is for the separator character that will probably be emitted. */
800 int len = strlen (text) + 1;
803 && pos + len > MAX_LINE)
805 print_fn (SWITCH_TYPE_LINE_END, NULL);
810 pos += print_fn (SWITCH_TYPE_LINE_START, NULL);
812 print_fn (type, text);
816 /* Print active target switches using PRINT_FN.
817 POS is the current cursor position and MAX is the size of a "line".
818 Each line begins with INDENT and ends with TERM.
819 Each switch is separated from the next by SEP. */
822 print_switch_values (print_switch_fn_type print_fn)
827 /* Fill in the -frandom-seed option, if the user didn't pass it, so
828 that it can be printed below. This helps reproducibility. */
829 if (!flag_random_seed)
832 /* Print the options as passed. */
833 pos = print_single_switch (print_fn, pos,
834 SWITCH_TYPE_DESCRIPTIVE, _("options passed: "));
836 for (j = 1; j < save_decoded_options_count; j++)
838 switch (save_decoded_options[j].opt_index)
851 pos = print_single_switch (print_fn, pos, SWITCH_TYPE_PASSED,
852 save_decoded_options[j].orig_option_with_args_text);
856 print_fn (SWITCH_TYPE_LINE_END, NULL);
858 /* Print the -f and -m options that have been enabled.
859 We don't handle language specific options but printing argv
861 pos = print_single_switch (print_fn, 0,
862 SWITCH_TYPE_DESCRIPTIVE, _("options enabled: "));
864 for (j = 0; j < cl_options_count; j++)
865 if (cl_options[j].cl_report
866 && option_enabled (j, &global_options) > 0)
867 pos = print_single_switch (print_fn, pos,
868 SWITCH_TYPE_ENABLED, cl_options[j].opt_text);
870 print_fn (SWITCH_TYPE_LINE_END, NULL);
873 /* Open assembly code output file. Do this even if -fsyntax-only is
874 on, because then the driver will have provided the name of a
875 temporary file or bit bucket for us. NAME is the file specified on
876 the command line, possibly NULL. */
878 init_asm_output (const char *name)
880 if (name == NULL && asm_file_name == 0)
881 asm_out_file = stdout;
884 if (asm_file_name == 0)
886 int len = strlen (dump_base_name);
887 char *dumpname = XNEWVEC (char, len + 6);
889 memcpy (dumpname, dump_base_name, len + 1);
890 strip_off_ending (dumpname, len);
891 strcat (dumpname, ".s");
892 asm_file_name = dumpname;
894 if (!strcmp (asm_file_name, "-"))
895 asm_out_file = stdout;
896 else if (!canonical_filename_eq (asm_file_name, name)
897 || !strcmp (asm_file_name, HOST_BIT_BUCKET))
898 asm_out_file = fopen (asm_file_name, "w");
900 /* Use UNKOWN_LOCATION to prevent gcc from printing the first
901 line in the current file. */
902 fatal_error (UNKNOWN_LOCATION,
903 "input file %qs is the same as output file",
905 if (asm_out_file == 0)
906 fatal_error (UNKNOWN_LOCATION,
907 "can%'t open %qs for writing: %m", asm_file_name);
910 if (!flag_syntax_only)
912 targetm.asm_out.file_start ();
914 if (flag_record_gcc_switches)
916 if (targetm.asm_out.record_gcc_switches)
918 /* Let the target know that we are about to start recording. */
919 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
921 /* Now record the switches. */
922 print_switch_values (targetm.asm_out.record_gcc_switches);
923 /* Let the target know that the recording is over. */
924 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
928 inform (UNKNOWN_LOCATION,
929 "-frecord-gcc-switches is not supported by "
930 "the current target");
933 if (flag_verbose_asm)
935 /* Print the list of switches in effect
936 into the assembler file as comments. */
937 print_version (asm_out_file, ASM_COMMENT_START, true);
938 print_switch_values (print_to_asm_out_file);
939 putc ('\n', asm_out_file);
944 /* A helper function; used as the reallocator function for cpp's line
947 realloc_for_line_map (void *ptr, size_t len)
949 return ggc_realloc (ptr, len);
952 /* A helper function: used as the allocator function for
953 identifier_to_locale. */
955 alloc_for_identifier_to_locale (size_t len)
957 return ggc_alloc_atomic (len);
960 /* Output stack usage information. */
962 output_stack_usage (void)
964 static bool warning_issued = false;
965 enum stack_usage_kind_type { STATIC = 0, DYNAMIC, DYNAMIC_BOUNDED };
966 const char *stack_usage_kind_str[] = {
971 HOST_WIDE_INT stack_usage = current_function_static_stack_size;
972 enum stack_usage_kind_type stack_usage_kind;
978 warning (0, "stack usage computation not supported for this target");
979 warning_issued = true;
984 stack_usage_kind = STATIC;
986 /* Add the maximum amount of space pushed onto the stack. */
987 if (current_function_pushed_stack_size > 0)
989 stack_usage += current_function_pushed_stack_size;
990 stack_usage_kind = DYNAMIC_BOUNDED;
993 /* Now on to the tricky part: dynamic stack allocation. */
994 if (current_function_allocates_dynamic_stack_space)
996 if (current_function_has_unbounded_dynamic_stack_size)
997 stack_usage_kind = DYNAMIC;
999 stack_usage_kind = DYNAMIC_BOUNDED;
1001 /* Add the size even in the unbounded case, this can't hurt. */
1002 stack_usage += current_function_dynamic_stack_size;
1005 if (flag_stack_usage)
1007 expanded_location loc
1008 = expand_location (DECL_SOURCE_LOCATION (current_function_decl));
1009 /* We don't want to print the full qualified name because it can be long,
1010 so we strip the scope prefix, but we may need to deal with the suffix
1011 created by the compiler. */
1013 = strchr (IDENTIFIER_POINTER (DECL_NAME (current_function_decl)), '.');
1015 = lang_hooks.decl_printable_name (current_function_decl, 2);
1018 const char *dot = strchr (name, '.');
1019 while (dot && strcasecmp (dot, suffix) != 0)
1022 dot = strchr (name, '.');
1027 const char *dot = strrchr (name, '.');
1032 fprintf (stack_usage_file,
1033 "%s:%d:%d:%s\t" HOST_WIDE_INT_PRINT_DEC"\t%s\n",
1034 lbasename (loc.file),
1039 stack_usage_kind_str[stack_usage_kind]);
1042 if (warn_stack_usage >= 0)
1044 const location_t loc = DECL_SOURCE_LOCATION (current_function_decl);
1046 if (stack_usage_kind == DYNAMIC)
1047 warning_at (loc, OPT_Wstack_usage_, "stack usage might be unbounded");
1048 else if (stack_usage > warn_stack_usage)
1050 if (stack_usage_kind == DYNAMIC_BOUNDED)
1052 OPT_Wstack_usage_, "stack usage might be %wd bytes",
1055 warning_at (loc, OPT_Wstack_usage_, "stack usage is %wd bytes",
1061 /* Open an auxiliary output file. */
1063 open_auxiliary_file (const char *ext)
1068 filename = concat (aux_base_name, ".", ext, NULL);
1069 file = fopen (filename, "w");
1071 fatal_error (input_location, "can%'t open %s for writing: %m", filename);
1076 /* Initialization of the front end environment, before command line
1077 options are parsed. Signal handlers, internationalization etc.
1078 ARGV0 is main's argv[0]. */
1080 general_init (const char *argv0, bool init_signals)
1084 p = argv0 + strlen (argv0);
1085 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1089 xmalloc_set_program_name (progname);
1093 /* Unlock the stdio streams. */
1094 unlock_std_streams ();
1096 gcc_init_libintl ();
1098 identifier_to_locale_alloc = alloc_for_identifier_to_locale;
1099 identifier_to_locale_free = ggc_free;
1101 /* Initialize the diagnostics reporting machinery, so option parsing
1102 can give warnings and errors. */
1103 diagnostic_initialize (global_dc, N_OPTS);
1104 /* Set a default printer. Language specific initializations will
1105 override it later. */
1106 tree_diagnostics_defaults (global_dc);
1108 global_dc->show_caret
1109 = global_options_init.x_flag_diagnostics_show_caret;
1110 global_dc->show_option_requested
1111 = global_options_init.x_flag_diagnostics_show_option;
1112 global_dc->show_column
1113 = global_options_init.x_flag_show_column;
1114 global_dc->internal_error = plugins_internal_error_function;
1115 global_dc->option_enabled = option_enabled;
1116 global_dc->option_state = &global_options;
1117 global_dc->option_name = option_name;
1121 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1123 signal (SIGSEGV, crash_signal);
1126 signal (SIGILL, crash_signal);
1129 signal (SIGBUS, crash_signal);
1132 signal (SIGABRT, crash_signal);
1134 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1135 signal (SIGIOT, crash_signal);
1138 signal (SIGFPE, crash_signal);
1141 /* Other host-specific signal setup. */
1142 (*host_hooks.extra_signals)();
1145 /* Initialize the garbage-collector, string pools and tree type hash
1149 input_location = UNKNOWN_LOCATION;
1150 line_table = ggc_alloc<line_maps> ();
1151 linemap_init (line_table, BUILTINS_LOCATION);
1152 line_table->reallocator = realloc_for_line_map;
1153 line_table->round_alloc_size = ggc_round_alloc_size;
1154 line_table->default_range_bits = 5;
1157 /* Initialize register usage now so switches may override. */
1160 /* Register the language-independent parameters. */
1161 global_init_params ();
1163 /* This must be done after global_init_params but before argument
1165 init_ggc_heuristics ();
1167 /* Create the singleton holder for global state.
1168 Doing so also creates the pass manager and with it the passes. */
1169 g = new gcc::context ();
1170 symtab = new (ggc_cleared_alloc <symbol_table> ()) symbol_table ();
1172 statistics_early_init ();
1176 /* Return true if the current target supports -fsection-anchors. */
1179 target_supports_section_anchors_p (void)
1181 if (targetm.min_anchor_offset == 0 && targetm.max_anchor_offset == 0)
1184 if (targetm.asm_out.output_anchor == NULL)
1190 /* Default the align_* variables to 1 if they're still unset, and
1191 set up the align_*_log variables. */
1193 init_alignments (void)
1195 if (align_loops <= 0)
1197 if (align_loops_max_skip > align_loops)
1198 align_loops_max_skip = align_loops - 1;
1199 align_loops_log = floor_log2 (align_loops * 2 - 1);
1200 if (align_jumps <= 0)
1202 if (align_jumps_max_skip > align_jumps)
1203 align_jumps_max_skip = align_jumps - 1;
1204 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1205 if (align_labels <= 0)
1207 align_labels_log = floor_log2 (align_labels * 2 - 1);
1208 if (align_labels_max_skip > align_labels)
1209 align_labels_max_skip = align_labels - 1;
1210 if (align_functions <= 0)
1211 align_functions = 1;
1212 align_functions_log = floor_log2 (align_functions * 2 - 1);
1215 /* Process the options that have been parsed. */
1217 process_options (void)
1219 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1220 This can happen with incorrect pre-processed input. */
1221 debug_hooks = &do_nothing_debug_hooks;
1223 maximum_field_alignment = initial_max_fld_align * BITS_PER_UNIT;
1225 /* Allow the front end to perform consistency checks and do further
1226 initialization based on the command line options. This hook also
1227 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1228 so we can correctly initialize debug output. */
1229 no_backend = lang_hooks.post_options (&main_input_filename);
1231 /* Some machines may reject certain combinations of options. */
1232 targetm.target_option.override ();
1234 /* Avoid any informative notes in the second run of -fcompare-debug. */
1235 if (flag_compare_debug)
1236 diagnostic_inhibit_notes (global_dc);
1238 if (flag_section_anchors && !target_supports_section_anchors_p ())
1240 warning_at (UNKNOWN_LOCATION, OPT_fsection_anchors,
1241 "this target does not support %qs",
1242 "-fsection-anchors");
1243 flag_section_anchors = 0;
1246 if (flag_short_enums == 2)
1247 flag_short_enums = targetm.default_short_enums ();
1249 /* Set aux_base_name if not already set. */
1252 else if (main_input_filename)
1254 char *name = xstrdup (lbasename (main_input_filename));
1256 strip_off_ending (name, strlen (name));
1257 aux_base_name = name;
1260 aux_base_name = "gccaux";
1264 || flag_loop_nest_optimize
1265 || flag_graphite_identity
1266 || flag_loop_parallelize_all)
1267 sorry ("Graphite loop optimizations cannot be used (isl is not available)"
1268 "(-fgraphite, -fgraphite-identity, -floop-block, "
1269 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1270 "-floop-unroll-and-jam, and -ftree-loop-linear)");
1273 if (flag_check_pointer_bounds)
1275 if (targetm.chkp_bound_mode () == VOIDmode)
1277 error_at (UNKNOWN_LOCATION,
1278 "-fcheck-pointer-bounds is not supported for this target");
1279 flag_check_pointer_bounds = 0;
1282 if (flag_sanitize & SANITIZE_ADDRESS)
1284 error_at (UNKNOWN_LOCATION,
1285 "-fcheck-pointer-bounds is not supported with "
1286 "Address Sanitizer");
1287 flag_check_pointer_bounds = 0;
1291 /* One region RA really helps to decrease the code size. */
1292 if (flag_ira_region == IRA_REGION_AUTODETECT)
1294 = optimize_size || !optimize ? IRA_REGION_ONE : IRA_REGION_MIXED;
1296 if (!abi_version_at_least (2))
1298 /* -fabi-version=1 support was removed after GCC 4.9. */
1299 error_at (UNKNOWN_LOCATION,
1300 "%<-fabi-version=1%> is no longer supported");
1301 flag_abi_version = 2;
1304 /* Unrolling all loops implies that standard loop unrolling must also
1306 if (flag_unroll_all_loops)
1307 flag_unroll_loops = 1;
1309 /* web and rename-registers help when run after loop unrolling. */
1310 if (flag_web == AUTODETECT_VALUE)
1311 flag_web = flag_unroll_loops || flag_peel_loops;
1313 if (flag_rename_registers == AUTODETECT_VALUE)
1314 flag_rename_registers = flag_unroll_loops || flag_peel_loops;
1316 if (flag_non_call_exceptions)
1317 flag_asynchronous_unwind_tables = 1;
1318 if (flag_asynchronous_unwind_tables)
1319 flag_unwind_tables = 1;
1321 if (flag_value_profile_transformations)
1322 flag_profile_values = 1;
1324 /* Warn about options that are not supported on this machine. */
1325 #ifndef INSN_SCHEDULING
1326 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1327 warning_at (UNKNOWN_LOCATION, 0,
1328 "instruction scheduling not supported on this target machine");
1330 if (!DELAY_SLOTS && flag_delayed_branch)
1331 warning_at (UNKNOWN_LOCATION, 0,
1332 "this target machine does not have delayed branches");
1334 user_label_prefix = USER_LABEL_PREFIX;
1335 if (flag_leading_underscore != -1)
1337 /* If the default prefix is more complicated than "" or "_",
1338 issue a warning and ignore this option. */
1339 if (user_label_prefix[0] == 0 ||
1340 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1342 user_label_prefix = flag_leading_underscore ? "_" : "";
1345 warning_at (UNKNOWN_LOCATION, 0,
1346 "-f%sleading-underscore not supported on this "
1347 "target machine", flag_leading_underscore ? "" : "no-");
1350 /* If we are in verbose mode, write out the version and maybe all the
1351 option flags in use. */
1354 print_version (stderr, "", true);
1356 print_switch_values (print_to_stderr);
1359 if (flag_syntax_only)
1361 write_symbols = NO_DEBUG;
1367 if (debug_info_level == DINFO_LEVEL_NONE)
1369 debug_info_level = DINFO_LEVEL_NORMAL;
1371 if (write_symbols == NO_DEBUG)
1372 write_symbols = PREFERRED_DEBUGGING_TYPE;
1375 debug_info_level = DINFO_LEVEL_NONE;
1378 if (flag_dump_final_insns && !flag_syntax_only && !no_backend)
1380 FILE *final_output = fopen (flag_dump_final_insns, "w");
1383 error_at (UNKNOWN_LOCATION,
1384 "could not open final insn dump file %qs: %m",
1385 flag_dump_final_insns);
1386 flag_dump_final_insns = NULL;
1388 else if (fclose (final_output))
1390 error_at (UNKNOWN_LOCATION,
1391 "could not close zeroed insn dump file %qs: %m",
1392 flag_dump_final_insns);
1393 flag_dump_final_insns = NULL;
1397 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1399 if (debug_info_level == DINFO_LEVEL_NONE)
1400 write_symbols = NO_DEBUG;
1402 if (write_symbols == NO_DEBUG)
1404 #if defined(DBX_DEBUGGING_INFO)
1405 else if (write_symbols == DBX_DEBUG)
1406 debug_hooks = &dbx_debug_hooks;
1408 #if defined(XCOFF_DEBUGGING_INFO)
1409 else if (write_symbols == XCOFF_DEBUG)
1410 debug_hooks = &xcoff_debug_hooks;
1412 else if (SDB_DEBUGGING_INFO && write_symbols == SDB_DEBUG)
1413 debug_hooks = &sdb_debug_hooks;
1414 #ifdef DWARF2_DEBUGGING_INFO
1415 else if (write_symbols == DWARF2_DEBUG)
1416 debug_hooks = &dwarf2_debug_hooks;
1418 #ifdef VMS_DEBUGGING_INFO
1419 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1420 debug_hooks = &vmsdbg_debug_hooks;
1422 #ifdef DWARF2_LINENO_DEBUGGING_INFO
1423 else if (write_symbols == DWARF2_DEBUG)
1424 debug_hooks = &dwarf2_lineno_debug_hooks;
1427 error_at (UNKNOWN_LOCATION,
1428 "target system does not support the %qs debug format",
1429 debug_type_names[write_symbols]);
1431 /* We know which debug output will be used so we can set flag_var_tracking
1432 and flag_var_tracking_uninit if the user has not specified them. */
1433 if (debug_info_level < DINFO_LEVEL_NORMAL
1434 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
1436 if (flag_var_tracking == 1
1437 || flag_var_tracking_uninit == 1)
1439 if (debug_info_level < DINFO_LEVEL_NORMAL)
1440 warning_at (UNKNOWN_LOCATION, 0,
1441 "variable tracking requested, but useless unless "
1442 "producing debug info");
1444 warning_at (UNKNOWN_LOCATION, 0,
1445 "variable tracking requested, but not supported "
1446 "by this debug format");
1448 flag_var_tracking = 0;
1449 flag_var_tracking_uninit = 0;
1452 /* The debug hooks are used to implement -fdump-go-spec because it
1453 gives a simple and stable API for all the information we need to
1455 if (flag_dump_go_spec != NULL)
1456 debug_hooks = dump_go_spec_init (flag_dump_go_spec, debug_hooks);
1458 /* If the user specifically requested variable tracking with tagging
1459 uninitialized variables, we need to turn on variable tracking.
1460 (We already determined above that variable tracking is feasible.) */
1461 if (flag_var_tracking_uninit == 1)
1462 flag_var_tracking = 1;
1464 if (flag_var_tracking == AUTODETECT_VALUE)
1465 flag_var_tracking = optimize >= 1;
1467 if (flag_var_tracking_uninit == AUTODETECT_VALUE)
1468 flag_var_tracking_uninit = flag_var_tracking;
1470 if (flag_var_tracking_assignments == AUTODETECT_VALUE)
1471 flag_var_tracking_assignments = flag_var_tracking
1472 && !(flag_selective_scheduling || flag_selective_scheduling2);
1474 if (flag_var_tracking_assignments_toggle)
1475 flag_var_tracking_assignments = !flag_var_tracking_assignments;
1477 if (flag_var_tracking_assignments && !flag_var_tracking)
1478 flag_var_tracking = flag_var_tracking_assignments = -1;
1480 if (flag_var_tracking_assignments
1481 && (flag_selective_scheduling || flag_selective_scheduling2))
1482 warning_at (UNKNOWN_LOCATION, 0,
1483 "var-tracking-assignments changes selective scheduling");
1485 if (flag_tree_cselim == AUTODETECT_VALUE)
1487 if (HAVE_conditional_move)
1488 flag_tree_cselim = 1;
1490 flag_tree_cselim = 0;
1493 /* If auxiliary info generation is desired, open the output file.
1494 This goes in the same directory as the source file--unlike
1495 all the other output files. */
1496 if (flag_gen_aux_info)
1498 aux_info_file = fopen (aux_info_file_name, "w");
1499 if (aux_info_file == 0)
1500 fatal_error (UNKNOWN_LOCATION,
1501 "can%'t open %s: %m", aux_info_file_name);
1504 if (!targetm_common.have_named_sections)
1506 if (flag_function_sections)
1508 warning_at (UNKNOWN_LOCATION, 0,
1509 "-ffunction-sections not supported for this target");
1510 flag_function_sections = 0;
1512 if (flag_data_sections)
1514 warning_at (UNKNOWN_LOCATION, 0,
1515 "-fdata-sections not supported for this target");
1516 flag_data_sections = 0;
1520 if (flag_prefetch_loop_arrays > 0 && !targetm.code_for_prefetch)
1522 warning_at (UNKNOWN_LOCATION, 0,
1523 "-fprefetch-loop-arrays not supported for this target");
1524 flag_prefetch_loop_arrays = 0;
1526 else if (flag_prefetch_loop_arrays > 0 && !targetm.have_prefetch ())
1528 warning_at (UNKNOWN_LOCATION, 0,
1529 "-fprefetch-loop-arrays not supported for this target "
1530 "(try -march switches)");
1531 flag_prefetch_loop_arrays = 0;
1534 /* This combination of options isn't handled for i386 targets and doesn't
1535 make much sense anyway, so don't allow it. */
1536 if (flag_prefetch_loop_arrays > 0 && optimize_size)
1538 warning_at (UNKNOWN_LOCATION, 0,
1539 "-fprefetch-loop-arrays is not supported with -Os");
1540 flag_prefetch_loop_arrays = 0;
1543 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1544 if (flag_signaling_nans)
1545 flag_trapping_math = 1;
1547 /* We cannot reassociate if we want traps or signed zeros. */
1548 if (flag_associative_math && (flag_trapping_math || flag_signed_zeros))
1550 warning_at (UNKNOWN_LOCATION, 0,
1551 "-fassociative-math disabled; other options take "
1553 flag_associative_math = 0;
1556 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1557 if (flag_cx_limited_range)
1558 flag_complex_method = 0;
1560 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1561 if (flag_cx_fortran_rules)
1562 flag_complex_method = 1;
1564 /* Targets must be able to place spill slots at lower addresses. If the
1565 target already uses a soft frame pointer, the transition is trivial. */
1566 if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
1568 warning_at (UNKNOWN_LOCATION, 0,
1569 "-fstack-protector not supported for this target");
1570 flag_stack_protect = 0;
1572 if (!flag_stack_protect)
1573 warn_stack_protect = 0;
1575 /* Address Sanitizer needs porting to each target architecture. */
1577 if ((flag_sanitize & SANITIZE_ADDRESS)
1578 && !FRAME_GROWS_DOWNWARD)
1580 warning_at (UNKNOWN_LOCATION, 0,
1581 "-fsanitize=address and -fsanitize=kernel-address "
1582 "are not supported for this target");
1583 flag_sanitize &= ~SANITIZE_ADDRESS;
1586 if ((flag_sanitize & SANITIZE_USER_ADDRESS)
1587 && targetm.asan_shadow_offset == NULL)
1589 warning_at (UNKNOWN_LOCATION, 0,
1590 "-fsanitize=address not supported for this target");
1591 flag_sanitize &= ~SANITIZE_ADDRESS;
1594 /* Do not use IPA optimizations for register allocation if profiler is active
1595 or port does not emit prologue and epilogue as RTL. */
1596 if (profile_flag || !targetm.have_prologue () || !targetm.have_epilogue ())
1599 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1600 have not been set. */
1601 if (!global_options_set.x_warnings_are_errors
1602 && warn_coverage_mismatch
1603 && (global_dc->classify_diagnostic[OPT_Wcoverage_mismatch] ==
1605 diagnostic_classify_diagnostic (global_dc, OPT_Wcoverage_mismatch,
1606 DK_ERROR, UNKNOWN_LOCATION);
1608 /* Save the current optimization options. */
1609 optimization_default_node = build_optimization_node (&global_options);
1610 optimization_current_node = optimization_default_node;
1612 /* Please don't change global_options after this point, those changes won't
1613 be reflected in optimization_{default,current}_node. */
1616 /* This function can be called multiple times to reinitialize the compiler
1617 back end when register classes or instruction sets have changed,
1618 before each function. */
1620 backend_init_target (void)
1622 /* Initialize alignment variables. */
1625 /* This depends on stack_pointer_rtx. */
1626 init_fake_stack_mems ();
1628 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1630 init_alias_target ();
1632 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1635 /* Depends on the enabled attribute. */
1638 /* The following initialization functions need to generate rtl, so
1639 provide a dummy function context for them. */
1640 init_dummy_function_start ();
1642 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1643 on a mode change. */
1645 init_lower_subreg ();
1648 init_expr_target ();
1651 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1652 after a mode change as well. */
1653 caller_save_initialized_p = false;
1655 expand_dummy_function_end ();
1658 /* Initialize the compiler back end. This function is called only once,
1659 when starting the compiler. */
1666 init_inline_once ();
1667 init_varasm_once ();
1668 save_register_info ();
1670 /* Middle end needs this initialization for default mem attributes
1671 used by early calls to make_decl_rtl. */
1674 /* Middle end needs this initialization for mode tables used to assign
1675 modes to vector variables. */
1679 /* Initialize excess precision settings. */
1681 init_excess_precision (void)
1683 /* Adjust excess precision handling based on the target options. If
1684 the front end cannot handle it, flag_excess_precision_cmdline
1685 will already have been set accordingly in the post_options
1687 gcc_assert (flag_excess_precision_cmdline != EXCESS_PRECISION_DEFAULT);
1688 flag_excess_precision = flag_excess_precision_cmdline;
1689 if (flag_unsafe_math_optimizations)
1690 flag_excess_precision = EXCESS_PRECISION_FAST;
1691 if (flag_excess_precision == EXCESS_PRECISION_STANDARD)
1693 int flt_eval_method = TARGET_FLT_EVAL_METHOD;
1694 switch (flt_eval_method)
1698 /* Either the target acts unpredictably (-1) or has all the
1699 operations required not to have excess precision (0). */
1700 flag_excess_precision = EXCESS_PRECISION_FAST;
1704 /* In these cases, predictable excess precision makes
1708 /* Any other implementation-defined FLT_EVAL_METHOD values
1709 require the compiler to handle the associated excess
1710 precision rules in excess_precision_type. */
1716 /* Initialize things that are both lang-dependent and target-dependent.
1717 This function can be called more than once if target parameters change. */
1719 lang_dependent_init_target (void)
1721 /* This determines excess precision settings. */
1722 init_excess_precision ();
1724 /* This creates various _DECL nodes, so needs to be called after the
1725 front end is initialized. It also depends on the HAVE_xxx macros
1726 generated from the target machine description. */
1729 gcc_assert (!this_target_rtl->target_specific_initialized);
1732 /* Perform initializations that are lang-dependent or target-dependent.
1733 but matters only for late optimizations and RTL generation. */
1735 static int rtl_initialized;
1738 initialize_rtl (void)
1740 auto_timevar tv (g_timer, TV_INITIALIZE_RTL);
1742 /* Initialization done just once per compilation, but delayed
1743 till code generation. */
1744 if (!rtl_initialized)
1746 rtl_initialized = true;
1748 /* Target specific RTL backend initialization. */
1749 if (!this_target_rtl->target_specific_initialized)
1751 backend_init_target ();
1752 this_target_rtl->target_specific_initialized = true;
1756 /* Language-dependent initialization. Returns nonzero on success. */
1758 lang_dependent_init (const char *name)
1760 location_t save_loc = input_location;
1761 if (dump_base_name == 0)
1762 dump_base_name = name && name[0] ? name : "gccdump";
1764 /* Other front-end initialization. */
1765 input_location = BUILTINS_LOCATION;
1766 if (lang_hooks.init () == 0)
1768 input_location = save_loc;
1772 init_asm_output (name);
1774 /* If stack usage information is desired, open the output file. */
1775 if (flag_stack_usage)
1776 stack_usage_file = open_auxiliary_file ("su");
1779 /* This creates various _DECL nodes, so needs to be called after the
1780 front end is initialized. */
1783 /* Do the target-specific parts of the initialization. */
1784 lang_dependent_init_target ();
1788 /* If dbx symbol table desired, initialize writing it and output the
1789 predefined types. */
1790 timevar_push (TV_SYMOUT);
1792 /* Now we have the correct original filename, we can initialize
1794 (*debug_hooks->init) (name);
1796 timevar_pop (TV_SYMOUT);
1803 /* Reinitialize everything when target parameters, such as register usage,
1806 target_reinit (void)
1808 struct rtl_data saved_x_rtl;
1809 rtx *saved_regno_reg_rtx;
1810 tree saved_optimization_current_node;
1811 struct target_optabs *saved_this_fn_optabs;
1813 /* Temporarily switch to the default optimization node, so that
1814 *this_target_optabs is set to the default, not reflecting
1815 whatever a previous function used for the optimize
1817 saved_optimization_current_node = optimization_current_node;
1818 saved_this_fn_optabs = this_fn_optabs;
1819 if (saved_optimization_current_node != optimization_default_node)
1821 optimization_current_node = optimization_default_node;
1822 cl_optimization_restore
1824 TREE_OPTIMIZATION (optimization_default_node));
1826 this_fn_optabs = this_target_optabs;
1828 /* Save *crtl and regno_reg_rtx around the reinitialization
1829 to allow target_reinit being called even after prepare_function_start. */
1830 saved_regno_reg_rtx = regno_reg_rtx;
1831 if (saved_regno_reg_rtx)
1833 saved_x_rtl = *crtl;
1834 memset (crtl, '\0', sizeof (*crtl));
1835 regno_reg_rtx = NULL;
1838 this_target_rtl->target_specific_initialized = false;
1840 /* This initializes hard_frame_pointer, and calls init_reg_modes_target()
1841 to initialize reg_raw_mode[]. */
1844 /* This invokes target hooks to set fixed_reg[] etc, which is
1848 /* Reinitialize lang-dependent parts. */
1849 lang_dependent_init_target ();
1851 /* Restore the original optimization node. */
1852 if (saved_optimization_current_node != optimization_default_node)
1854 optimization_current_node = saved_optimization_current_node;
1855 cl_optimization_restore (&global_options,
1856 TREE_OPTIMIZATION (optimization_current_node));
1858 this_fn_optabs = saved_this_fn_optabs;
1860 /* Restore regno_reg_rtx at the end, as free_after_compilation from
1861 expand_dummy_function_end clears it. */
1862 if (saved_regno_reg_rtx)
1864 *crtl = saved_x_rtl;
1865 regno_reg_rtx = saved_regno_reg_rtx;
1866 saved_regno_reg_rtx = NULL;
1871 dump_memory_report (bool final)
1873 dump_line_table_statistics ();
1874 ggc_print_statistics ();
1875 stringpool_statistics ();
1876 dump_tree_statistics ();
1877 dump_gimple_statistics ();
1878 dump_rtx_statistics ();
1879 dump_alloc_pool_statistics ();
1880 dump_bitmap_statistics ();
1881 dump_hash_table_loc_statistics ();
1882 dump_vec_loc_statistics ();
1883 dump_ggc_loc_statistics (final);
1884 dump_alias_stats (stderr);
1885 dump_pta_stats (stderr);
1888 /* Clean up: close opened files, etc. */
1891 finalize (bool no_backend)
1893 /* Close the dump files. */
1894 if (flag_gen_aux_info)
1896 fclose (aux_info_file);
1898 unlink (aux_info_file_name);
1901 /* Close non-debugging input and output files. Take special care to note
1902 whether fclose returns an error, since the pages might still be on the
1903 buffer chain while the file is open. */
1907 if (ferror (asm_out_file) != 0)
1908 fatal_error (input_location, "error writing to %s: %m", asm_file_name);
1909 if (fclose (asm_out_file) != 0)
1910 fatal_error (input_location, "error closing %s: %m", asm_file_name);
1913 if (stack_usage_file)
1914 fclose (stack_usage_file);
1920 g->get_passes ()->finish_optimization_passes ();
1926 dump_memory_report (true);
1929 dump_profile_report ();
1931 /* Language-specific end of compilation actions. */
1932 lang_hooks.finish ();
1936 standard_type_bitsize (int bitsize)
1938 /* As a special exception, we always want __int128 enabled if possible. */
1941 if (bitsize == CHAR_TYPE_SIZE
1942 || bitsize == SHORT_TYPE_SIZE
1943 || bitsize == INT_TYPE_SIZE
1944 || bitsize == LONG_TYPE_SIZE
1945 || bitsize == LONG_LONG_TYPE_SIZE)
1950 /* Initialize the compiler, and compile the input file. */
1956 /* Don't do any more if an error has already occurred. */
1961 timevar_start (TV_PHASE_SETUP);
1963 /* This must be run always, because it is needed to compute the FP
1964 predefined macros, such as __LDBL_MAX__, for targets using non
1965 default FP formats. */
1966 init_adjust_machine_modes ();
1967 init_derived_machine_modes ();
1969 /* This must happen after the backend has a chance to process
1970 command line options, but before the parsers are
1972 for (i = 0; i < NUM_INT_N_ENTS; i ++)
1973 if (targetm.scalar_mode_supported_p (int_n_data[i].m)
1974 && ! standard_type_bitsize (int_n_data[i].bitsize))
1975 int_n_enabled_p[i] = true;
1977 int_n_enabled_p[i] = false;
1979 /* Set up the back-end if requested. */
1983 /* Language-dependent initialization. Returns true on success. */
1984 if (lang_dependent_init (main_input_filename))
1986 /* Initialize yet another pass. */
1988 ggc_protect_identifiers = true;
1990 symtab->initialize ();
1991 init_final (main_input_filename);
1992 coverage_init (aux_base_name);
1994 invoke_plugin_callbacks (PLUGIN_START_UNIT, NULL);
1996 timevar_stop (TV_PHASE_SETUP);
2002 timevar_stop (TV_PHASE_SETUP);
2005 timevar_start (TV_PHASE_FINALIZE);
2007 finalize (no_backend);
2009 timevar_stop (TV_PHASE_FINALIZE);
2013 toplev::toplev (timer *external_timer,
2015 : m_use_TV_TOTAL (external_timer == NULL),
2016 m_init_signals (init_signals)
2019 g_timer = external_timer;
2024 if (g_timer && m_use_TV_TOTAL)
2026 g_timer->stop (TV_TOTAL);
2027 g_timer->print (stderr);
2033 /* Potentially call timevar_init (which will create g_timevars if it
2034 doesn't already exist). */
2037 toplev::start_timevars ()
2039 if (time_report || !quiet_flag || flag_detailed_statistics)
2042 timevar_start (TV_TOTAL);
2045 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2046 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2047 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2049 It is not safe to call this function more than once. */
2052 toplev::main (int argc, char **argv)
2054 /* Parsing and gimplification sometimes need quite large stack.
2055 Increase stack size limits if possible. */
2056 stack_limit_increase (64 * 1024 * 1024);
2058 expandargv (&argc, &argv);
2060 /* Initialization of GCC's environment, and diagnostics. */
2061 general_init (argv[0], m_init_signals);
2063 /* One-off initialization of options that does not need to be
2064 repeated when options are added for particular functions. */
2065 init_options_once ();
2066 init_opts_obstack ();
2068 /* Initialize global options structures; this must be repeated for
2069 each structure used for parsing options. */
2070 init_options_struct (&global_options, &global_options_set);
2071 lang_hooks.init_options_struct (&global_options);
2073 /* Convert the options to an array. */
2074 decode_cmdline_options_to_array_default_mask (argc,
2075 CONST_CAST2 (const char **,
2077 &save_decoded_options,
2078 &save_decoded_options_count);
2080 /* Perform language-specific options initialization. */
2081 lang_hooks.init_options (save_decoded_options_count, save_decoded_options);
2083 /* Parse the options and do minimal processing; basically just
2084 enough to default flags appropriately. */
2085 decode_options (&global_options, &global_options_set,
2086 save_decoded_options, save_decoded_options_count,
2087 UNKNOWN_LOCATION, global_dc);
2089 handle_common_deferred_options ();
2093 initialize_plugins ();
2096 print_version (stderr, "", true);
2099 print_plugins_help (stderr, "");
2101 /* Exit early if we can (e.g. -help). */
2102 if (!exit_after_options)
2109 if (warningcount || errorcount || werrorcount)
2110 print_ignored_options ();
2112 /* Invoke registered plugin callbacks if any. Some plugins could
2113 emit some diagnostics here. */
2114 invoke_plugin_callbacks (PLUGIN_FINISH, NULL);
2116 diagnostic_finish (global_dc);
2118 finalize_plugins ();
2119 location_adhoc_data_fini (line_table);
2121 after_memory_report = true;
2123 if (seen_error () || werrorcount)
2124 return (FATAL_EXIT_CODE);
2126 return (SUCCESS_EXIT_CODE);
2129 /* For those that want to, this function aims to clean up enough state that
2130 you can call toplev::main again. */
2132 toplev::finalize (void)
2134 rtl_initialized = false;
2135 this_target_rtl->target_specific_initialized = false;
2137 /* Needs to be called before cgraph_c_finalize since it uses symtab. */
2138 ipa_reference_c_finalize ();
2140 cgraph_c_finalize ();
2141 cgraphunit_c_finalize ();
2142 dwarf2out_c_finalize ();
2144 ipa_cp_c_finalize ();
2145 ira_costs_c_finalize ();
2146 params_c_finalize ();
2148 finalize_options_struct (&global_options);
2149 finalize_options_struct (&global_options_set);
2151 /* save_decoded_options uses opts_obstack, so these must
2152 be cleaned up together. */
2153 obstack_free (&opts_obstack, NULL);
2154 XDELETEVEC (save_decoded_options);
2155 save_decoded_options = NULL;
2156 save_decoded_options_count = 0;
2158 /* Clean up the context (and pass_manager etc). */