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
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 "tree-inline.h"
34 #include "realmpfr.h" /* For GMP/MPFR/MPC versions, in print_version. */
39 #include "insn-attr.h"
40 #include "insn-config.h"
41 #include "insn-flags.h"
42 #include "hard-reg-set.h"
56 #include "diagnostic.h"
57 #include "tree-diagnostic.h"
58 #include "tree-pretty-print.h"
63 #include "dwarf2asm.h"
66 #include "common/common-target.h"
67 #include "langhooks.h"
68 #include "cfgloop.h" /* for init_set_costs */
69 #include "hosthooks.h"
71 #include "basic-block.h"
74 #include "plugin-api.h"
78 #include "opts-diagnostic.h"
80 #include "value-prof.h"
81 #include "alloc-pool.h"
84 #include "tree-ssa-alias.h"
85 #include "internal-fn.h"
86 #include "gimple-expr.h"
89 #include "diagnostic-color.h"
91 #include "pass_manager.h"
92 #include "auto-profile.h"
93 #include "dwarf2out.h"
95 #include "ipa-reference.h"
98 #include "insn-codes.h"
100 #include "tree-chkp.h"
102 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
106 #ifdef SDB_DEBUGGING_INFO
110 #ifdef XCOFF_DEBUGGING_INFO
111 #include "xcoffout.h" /* Needed for external data
112 declarations for e.g. AIX 4.x. */
117 static void general_init (const char *);
118 static void do_compile ();
119 static void process_options (void);
120 static void backend_init (void);
121 static int lang_dependent_init (const char *);
122 static void init_asm_output (const char *);
123 static void finalize (bool);
125 static void crash_signal (int) ATTRIBUTE_NORETURN;
126 static void compile_file (void);
128 /* True if we don't need a backend (e.g. preprocessing only). */
129 static bool no_backend;
131 /* Length of line when printing switch values. */
134 /* Decoded options, and number of such options. */
135 struct cl_decoded_option *save_decoded_options;
136 unsigned int save_decoded_options_count;
138 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
139 to optimize in process_options (). */
140 #define AUTODETECT_VALUE 2
142 /* Debug hooks - dependent upon command line options. */
144 const struct gcc_debug_hooks *debug_hooks;
146 /* The FUNCTION_DECL for the function currently being compiled,
147 or 0 if between functions. */
148 tree current_function_decl;
150 /* Set to the FUNC_BEGIN label of the current function, or NULL
152 const char * current_function_func_begin_label;
154 /* A random sequence of characters, unless overridden by user. */
155 static const char *flag_random_seed;
157 /* A local time stamp derived from the time of compilation. It will be
158 zero if the system cannot provide a time. It will be -1u, if the
159 user has specified a particular random seed. */
162 /* Random number for this compilation */
163 HOST_WIDE_INT random_seed;
167 /* When non-NULL, indicates that whenever space is allocated on the
168 stack, the resulting stack pointer must not pass this
169 address---that is, for stacks that grow downward, the stack pointer
170 must always be greater than or equal to this address; for stacks
171 that grow upward, the stack pointer must be less than this address.
172 At present, the rtx may be either a REG or a SYMBOL_REF, although
173 the support provided depends on the backend. */
176 /* True if the user has tagged the function with the 'section'
179 bool user_defined_section_attribute = false;
181 struct target_flag_state default_target_flag_state;
182 #if SWITCHABLE_TARGET
183 struct target_flag_state *this_target_flag_state = &default_target_flag_state;
185 #define this_target_flag_state (&default_target_flag_state)
188 /* The user symbol prefix after having resolved same. */
189 const char *user_label_prefix;
191 /* Output files for assembler code (real compiler output)
192 and debugging dumps. */
196 FILE *stack_usage_file = NULL;
198 /* The current working directory of a translation. It's generally the
199 directory from which compilation was initiated, but a preprocessed
200 file may specify the original directory in which it was
203 static const char *src_pwd;
205 /* Initialize src_pwd with the given string, and return true. If it
206 was already initialized, return false. As a special case, it may
207 be called with a NULL argument to test whether src_pwd has NOT been
211 set_src_pwd (const char *pwd)
215 if (strcmp (src_pwd, pwd) == 0)
221 src_pwd = xstrdup (pwd);
225 /* Return the directory from which the translation unit was initiated,
226 in case set_src_pwd() was not called before to assign it a
242 /* Called when the start of a function definition is parsed,
243 this function prints on stderr the name of the function. */
245 announce_function (tree decl)
249 if (rtl_dump_and_exit)
250 fprintf (stderr, "%s ",
251 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl))));
253 fprintf (stderr, " %s",
254 identifier_to_locale (lang_hooks.decl_printable_name (decl, 2)));
256 pp_needs_newline (global_dc->printer) = true;
257 diagnostic_set_last_function (global_dc, (diagnostic_info *) NULL);
261 /* Initialize local_tick with a random number or -1 if
262 flag_random_seed is set. */
265 init_local_tick (void)
267 if (!flag_random_seed)
269 /* Try urandom first. Time of day is too likely to collide.
270 In case of any error we just use the local tick. */
272 int fd = open ("/dev/urandom", O_RDONLY);
275 read (fd, &random_seed, sizeof (random_seed));
279 /* Now get the tick anyways */
280 #ifdef HAVE_GETTIMEOFDAY
284 gettimeofday (&tv, NULL);
285 local_tick = (unsigned) tv.tv_sec * 1000 + tv.tv_usec / 1000;
289 time_t now = time (NULL);
291 if (now != (time_t)-1)
292 local_tick = (unsigned) now;
300 /* Set up a default flag_random_seed and local_tick, unless the user
301 already specified one. Must be called after init_local_tick. */
304 init_random_seed (void)
307 random_seed = local_tick ^ getpid (); /* Old racey fallback method */
310 /* Obtain the random_seed. Unless NOINIT, initialize it if
311 it's not provided in the command line. */
314 get_random_seed (bool noinit)
316 if (!flag_random_seed && !noinit)
321 /* Modify the random_seed string to VAL. Return its previous
325 set_random_seed (const char *val)
327 const char *old = flag_random_seed;
328 flag_random_seed = val;
329 if (flag_random_seed)
333 /* When the driver passed in a hex number don't crc it again */
334 random_seed = strtoul (flag_random_seed, &endp, 0);
335 if (!(endp > flag_random_seed && *endp == 0))
336 random_seed = crc32_string (0, flag_random_seed);
341 /* Handler for fatal signals, such as SIGSEGV. These are transformed
342 into ICE messages, which is much more user friendly. In case the
343 error printer crashes, reset the signal to prevent infinite recursion. */
346 crash_signal (int signo)
348 signal (signo, SIG_DFL);
350 /* If we crashed while processing an ASM statement, then be a little more
351 graceful. It's most likely the user's fault. */
352 if (this_is_asm_operands)
354 output_operand_lossage ("unrecoverable error");
355 exit (FATAL_EXIT_CODE);
358 internal_error ("%s", strsignal (signo));
361 /* A subroutine of wrapup_global_declarations. We've come to the end of
362 the compilation unit. All deferred variables should be undeferred,
363 and all incomplete decls should be finalized. */
366 wrapup_global_declaration_1 (tree decl)
368 /* We're not deferring this any longer. Assignment is conditional to
369 avoid needlessly dirtying PCH pages. */
370 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl), TS_DECL_WITH_VIS)
371 && DECL_DEFER_OUTPUT (decl) != 0)
372 DECL_DEFER_OUTPUT (decl) = 0;
374 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
375 lang_hooks.finish_incomplete_decl (decl);
378 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
379 needs to be output. Return true if it is output. */
382 wrapup_global_declaration_2 (tree decl)
384 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl)
385 || (TREE_CODE (decl) == VAR_DECL && DECL_HAS_VALUE_EXPR_P (decl)))
388 /* Don't write out static consts, unless we still need them.
390 We also keep static consts if not optimizing (for debugging),
391 unless the user specified -fno-keep-static-consts.
392 ??? They might be better written into the debug information.
393 This is possible when using DWARF.
395 A language processor that wants static constants to be always
396 written out (even if it is not used) is responsible for
397 calling rest_of_decl_compilation itself. E.g. the C front-end
398 calls rest_of_decl_compilation from finish_decl.
399 One motivation for this is that is conventional in some
400 environments to write things like:
401 static const char rcsid[] = "... version string ...";
402 intending to force the string to be in the executable.
404 A language processor that would prefer to have unneeded
405 static constants "optimized away" would just defer writing
406 them out until here. E.g. C++ does this, because static
407 constants are often defined in header files.
409 ??? A tempting alternative (for both C and C++) would be
410 to force a constant to be written if and only if it is
411 defined in a main file, as opposed to an include file. */
413 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
417 node = varpool_node::get (decl);
419 if (!node && flag_ltrans)
421 else if (node && node->definition)
423 else if (node && node->alias)
425 else if (!symtab->global_info_ready
427 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
429 else if (node && node->analyzed)
431 else if (DECL_COMDAT (decl))
433 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
434 && (optimize || !flag_keep_static_consts
435 || DECL_ARTIFICIAL (decl)))
440 rest_of_decl_compilation (decl, 1, 1);
448 /* Do any final processing required for the declarations in VEC, of
449 which there are LEN. We write out inline functions and variables
450 that have been deferred until this point, but which are required.
451 Returns nonzero if anything was put out. */
454 wrapup_global_declarations (tree *vec, int len)
456 bool reconsider, output_something = false;
459 for (i = 0; i < len; i++)
460 wrapup_global_declaration_1 (vec[i]);
462 /* Now emit any global variables or functions that we have been
463 putting off. We need to loop in case one of the things emitted
464 here references another one which comes earlier in the list. */
468 for (i = 0; i < len; i++)
469 reconsider |= wrapup_global_declaration_2 (vec[i]);
471 output_something = true;
475 return output_something;
478 /* A subroutine of check_global_declarations. Issue appropriate warnings
479 for the global declaration DECL. */
482 check_global_declaration_1 (tree decl)
484 /* Warn about any function declared static but not defined. We don't
485 warn about variables, because many programs have static variables
486 that exist only to get some text into the object file. */
487 if (TREE_CODE (decl) == FUNCTION_DECL
488 && DECL_INITIAL (decl) == 0
489 && DECL_EXTERNAL (decl)
490 && ! DECL_ARTIFICIAL (decl)
491 && ! TREE_NO_WARNING (decl)
492 && ! TREE_PUBLIC (decl)
493 && (warn_unused_function
494 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
496 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
497 pedwarn (input_location, 0, "%q+F used but never defined", decl);
499 warning (OPT_Wunused_function, "%q+F declared %<static%> but never defined", decl);
500 /* This symbol is effectively an "extern" declaration now. */
501 TREE_PUBLIC (decl) = 1;
504 /* Warn about static fns or vars defined but not used. */
505 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
506 /* We don't warn about "static const" variables because the
507 "rcs_id" idiom uses that construction. */
508 || (warn_unused_variable
509 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
510 && ! DECL_IN_SYSTEM_HEADER (decl)
511 && ! TREE_USED (decl)
512 /* The TREE_USED bit for file-scope decls is kept in the identifier,
513 to handle multiple external decls in different scopes. */
514 && ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl)))
515 && ! DECL_EXTERNAL (decl)
516 && ! TREE_PUBLIC (decl)
517 /* A volatile variable might be used in some non-obvious way. */
518 && ! TREE_THIS_VOLATILE (decl)
519 /* Global register variables must be declared to reserve them. */
520 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
521 /* Otherwise, ask the language. */
522 && lang_hooks.decls.warn_unused_global (decl))
523 warning ((TREE_CODE (decl) == FUNCTION_DECL)
524 ? OPT_Wunused_function
525 : OPT_Wunused_variable,
526 "%q+D defined but not used", decl);
529 /* Issue appropriate warnings for the global declarations in V (of
530 which there are LEN). */
533 check_global_declarations (tree *v, int len)
537 for (i = 0; i < len; i++)
538 check_global_declaration_1 (v[i]);
541 /* Emit debugging information for all global declarations in VEC. */
544 emit_debug_global_declarations (tree *vec, int len)
548 /* Avoid confusing the debug information machinery when there are errors. */
552 timevar_push (TV_SYMOUT);
553 for (i = 0; i < len; i++)
554 debug_hooks->global_decl (vec[i]);
555 timevar_pop (TV_SYMOUT);
558 /* Compile an entire translation unit. Write a file of assembly
559 output and various debugging dumps. */
564 timevar_start (TV_PHASE_PARSING);
565 timevar_push (TV_PARSE_GLOBAL);
567 /* Call the parser, which parses the entire file (calling
568 rest_of_compilation for each function). */
569 lang_hooks.parse_file ();
571 timevar_pop (TV_PARSE_GLOBAL);
572 timevar_stop (TV_PHASE_PARSING);
574 /* Compilation is now finished except for writing
575 what's left of the symbol table output. */
577 if (flag_syntax_only || flag_wpa)
580 ggc_protect_identifiers = false;
582 /* This must also call finalize_compilation_unit. */
583 lang_hooks.decls.final_write_globals ();
588 timevar_start (TV_PHASE_LATE_ASM);
590 /* Compilation unit is finalized. When producing non-fat LTO object, we are
591 basically finished. */
592 if (in_lto_p || !flag_lto || flag_fat_lto_objects)
594 /* File-scope initialization for AddressSanitizer. */
595 if (flag_sanitize & SANITIZE_ADDRESS)
598 if (flag_sanitize & SANITIZE_THREAD)
601 if (flag_check_pointer_bounds)
604 output_shared_constant_pool ();
605 output_object_blocks ();
606 finish_tm_clone_pairs ();
608 /* Write out any pending weak symbol declarations. */
611 /* This must be at the end before unwind and debug info.
612 Some target ports emit PIC setup thunks here. */
613 targetm.asm_out.code_end ();
615 /* Do dbx symbols. */
616 timevar_push (TV_SYMOUT);
618 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
619 if (dwarf2out_do_frame ())
620 dwarf2out_frame_finish ();
623 (*debug_hooks->finish) (main_input_filename);
624 timevar_pop (TV_SYMOUT);
626 /* Output some stuff at end of file if nec. */
628 dw2_output_indirect_constants ();
630 /* Flush any pending external directives. */
631 process_pending_assemble_externals ();
634 /* Emit LTO marker if LTO info has been previously emitted. This is
635 used by collect2 to determine whether an object file contains IL.
636 We used to emit an undefined reference here, but this produces
637 link errors if an object file with IL is stored into a shared
638 library without invoking lto1. */
639 if (flag_generate_lto)
641 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
642 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
644 (unsigned HOST_WIDE_INT) 1, 8);
645 #elif defined ASM_OUTPUT_ALIGNED_COMMON
646 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_v1",
647 (unsigned HOST_WIDE_INT) 1, 8);
649 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_v1",
650 (unsigned HOST_WIDE_INT) 1,
651 (unsigned HOST_WIDE_INT) 1);
653 /* Let linker plugin know that this is a slim object and must be LTOed
654 even when user did not ask for it. */
655 if (!flag_fat_lto_objects)
657 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
658 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
660 (unsigned HOST_WIDE_INT) 1, 8);
661 #elif defined ASM_OUTPUT_ALIGNED_COMMON
662 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_slim",
663 (unsigned HOST_WIDE_INT) 1, 8);
665 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_slim",
666 (unsigned HOST_WIDE_INT) 1,
667 (unsigned HOST_WIDE_INT) 1);
672 /* Attach a special .ident directive to the end of the file to identify
673 the version of GCC which compiled this code. The format of the .ident
674 string is patterned after the ones produced by native SVR4 compilers. */
677 const char *pkg_version = "(GNU) ";
680 if (strcmp ("(GCC) ", pkgversion_string))
681 pkg_version = pkgversion_string;
683 ident_str = ACONCAT (("GCC: ", pkg_version, version_string, NULL));
684 targetm.asm_out.output_ident (ident_str);
687 /* Auto profile finalization. */
688 if (flag_auto_profile)
691 /* Invoke registered plugin callbacks. */
692 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT, NULL);
694 /* This must be at the end. Some target ports emit end of file directives
695 into the assembly file here, and hence we can not output anything to the
696 assembly file after this point. */
697 targetm.asm_out.file_end ();
699 timevar_stop (TV_PHASE_LATE_ASM);
702 /* Print version information to FILE.
703 Each line begins with INDENT (for the case where FILE is the
704 assembler output file). */
707 print_version (FILE *file, const char *indent)
709 static const char fmt1[] =
711 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
713 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
716 static const char fmt2[] =
717 N_("GMP version %s, MPFR version %s, MPC version %s\n");
718 static const char fmt3[] =
719 N_("%s%swarning: %s header version %s differs from library version %s.\n");
720 static const char fmt4[] =
721 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
723 #define __VERSION__ "[?]"
726 file == stderr ? _(fmt1) : fmt1,
727 indent, *indent != 0 ? " " : "",
728 lang_hooks.name, pkgversion_string, version_string, TARGET_NAME,
729 indent, __VERSION__);
731 /* We need to stringify the GMP macro values. Ugh, gmp_version has
732 two string formats, "i.j.k" and "i.j" when k is zero. As of
733 gmp-4.3.0, GMP always uses the 3 number format. */
734 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
735 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3 (X)
736 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
737 #define GCC_GMP_VERSION \
738 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
739 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
740 #define GCC_GMP_STRINGIFY_VERSION \
741 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
742 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR)
744 #define GCC_GMP_STRINGIFY_VERSION \
745 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
746 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR) "." \
747 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_PATCHLEVEL)
750 file == stderr ? _(fmt2) : fmt2,
751 GCC_GMP_STRINGIFY_VERSION, MPFR_VERSION_STRING, MPC_VERSION_STRING);
752 if (strcmp (GCC_GMP_STRINGIFY_VERSION, gmp_version))
754 file == stderr ? _(fmt3) : fmt3,
755 indent, *indent != 0 ? " " : "",
756 "GMP", GCC_GMP_STRINGIFY_VERSION, gmp_version);
757 if (strcmp (MPFR_VERSION_STRING, mpfr_get_version ()))
759 file == stderr ? _(fmt3) : fmt3,
760 indent, *indent != 0 ? " " : "",
761 "MPFR", MPFR_VERSION_STRING, mpfr_get_version ());
762 if (strcmp (MPC_VERSION_STRING, mpc_get_version ()))
764 file == stderr ? _(fmt3) : fmt3,
765 indent, *indent != 0 ? " " : "",
766 "MPC", MPC_VERSION_STRING, mpc_get_version ());
768 file == stderr ? _(fmt4) : fmt4,
769 indent, *indent != 0 ? " " : "",
770 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
772 print_plugins_versions (file, indent);
776 print_to_asm_out_file (print_switch_type type, const char * text)
778 bool prepend_sep = true;
782 case SWITCH_TYPE_LINE_END:
783 putc ('\n', asm_out_file);
786 case SWITCH_TYPE_LINE_START:
787 fputs (ASM_COMMENT_START, asm_out_file);
788 return strlen (ASM_COMMENT_START);
790 case SWITCH_TYPE_DESCRIPTIVE:
791 if (ASM_COMMENT_START[0] == 0)
794 case SWITCH_TYPE_PASSED:
795 case SWITCH_TYPE_ENABLED:
797 fputc (' ', asm_out_file);
798 fputs (text, asm_out_file);
799 /* No need to return the length here as
800 print_single_switch has already done it. */
809 print_to_stderr (print_switch_type type, const char * text)
813 case SWITCH_TYPE_LINE_END:
817 case SWITCH_TYPE_LINE_START:
820 case SWITCH_TYPE_PASSED:
821 case SWITCH_TYPE_ENABLED:
825 case SWITCH_TYPE_DESCRIPTIVE:
826 fputs (text, stderr);
827 /* No need to return the length here as
828 print_single_switch has already done it. */
836 /* Print an option value and return the adjusted position in the line.
837 ??? print_fn doesn't handle errors, eg disk full; presumably other
838 code will catch a disk full though. */
841 print_single_switch (print_switch_fn_type print_fn,
843 print_switch_type type,
846 /* The ultrix fprintf returns 0 on success, so compute the result
847 we want here since we need it for the following test. The +1
848 is for the separator character that will probably be emitted. */
849 int len = strlen (text) + 1;
852 && pos + len > MAX_LINE)
854 print_fn (SWITCH_TYPE_LINE_END, NULL);
859 pos += print_fn (SWITCH_TYPE_LINE_START, NULL);
861 print_fn (type, text);
865 /* Print active target switches using PRINT_FN.
866 POS is the current cursor position and MAX is the size of a "line".
867 Each line begins with INDENT and ends with TERM.
868 Each switch is separated from the next by SEP. */
871 print_switch_values (print_switch_fn_type print_fn)
876 /* Fill in the -frandom-seed option, if the user didn't pass it, so
877 that it can be printed below. This helps reproducibility. */
878 if (!flag_random_seed)
881 /* Print the options as passed. */
882 pos = print_single_switch (print_fn, pos,
883 SWITCH_TYPE_DESCRIPTIVE, _("options passed: "));
885 for (j = 1; j < save_decoded_options_count; j++)
887 switch (save_decoded_options[j].opt_index)
900 pos = print_single_switch (print_fn, pos, SWITCH_TYPE_PASSED,
901 save_decoded_options[j].orig_option_with_args_text);
905 print_fn (SWITCH_TYPE_LINE_END, NULL);
907 /* Print the -f and -m options that have been enabled.
908 We don't handle language specific options but printing argv
910 pos = print_single_switch (print_fn, 0,
911 SWITCH_TYPE_DESCRIPTIVE, _("options enabled: "));
913 for (j = 0; j < cl_options_count; j++)
914 if (cl_options[j].cl_report
915 && option_enabled (j, &global_options) > 0)
916 pos = print_single_switch (print_fn, pos,
917 SWITCH_TYPE_ENABLED, cl_options[j].opt_text);
919 print_fn (SWITCH_TYPE_LINE_END, NULL);
922 /* Open assembly code output file. Do this even if -fsyntax-only is
923 on, because then the driver will have provided the name of a
924 temporary file or bit bucket for us. NAME is the file specified on
925 the command line, possibly NULL. */
927 init_asm_output (const char *name)
929 if (name == NULL && asm_file_name == 0)
930 asm_out_file = stdout;
933 if (asm_file_name == 0)
935 int len = strlen (dump_base_name);
936 char *dumpname = XNEWVEC (char, len + 6);
938 memcpy (dumpname, dump_base_name, len + 1);
939 strip_off_ending (dumpname, len);
940 strcat (dumpname, ".s");
941 asm_file_name = dumpname;
943 if (!strcmp (asm_file_name, "-"))
944 asm_out_file = stdout;
946 asm_out_file = fopen (asm_file_name, "w");
947 if (asm_out_file == 0)
948 fatal_error ("can%'t open %s for writing: %m", asm_file_name);
951 if (!flag_syntax_only)
953 targetm.asm_out.file_start ();
955 if (flag_record_gcc_switches)
957 if (targetm.asm_out.record_gcc_switches)
959 /* Let the target know that we are about to start recording. */
960 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
962 /* Now record the switches. */
963 print_switch_values (targetm.asm_out.record_gcc_switches);
964 /* Let the target know that the recording is over. */
965 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
969 inform (input_location, "-frecord-gcc-switches is not supported by the current target");
972 if (flag_verbose_asm)
974 /* Print the list of switches in effect
975 into the assembler file as comments. */
976 print_version (asm_out_file, ASM_COMMENT_START);
977 print_switch_values (print_to_asm_out_file);
978 putc ('\n', asm_out_file);
983 /* A helper function; used as the reallocator function for cpp's line
986 realloc_for_line_map (void *ptr, size_t len)
988 return ggc_realloc (ptr, len);
991 /* A helper function: used as the allocator function for
992 identifier_to_locale. */
994 alloc_for_identifier_to_locale (size_t len)
996 return ggc_alloc_atomic (len);
999 /* Output stack usage information. */
1001 output_stack_usage (void)
1003 static bool warning_issued = false;
1004 enum stack_usage_kind_type { STATIC = 0, DYNAMIC, DYNAMIC_BOUNDED };
1005 const char *stack_usage_kind_str[] = {
1010 HOST_WIDE_INT stack_usage = current_function_static_stack_size;
1011 enum stack_usage_kind_type stack_usage_kind;
1013 if (stack_usage < 0)
1015 if (!warning_issued)
1017 warning (0, "stack usage computation not supported for this target");
1018 warning_issued = true;
1023 stack_usage_kind = STATIC;
1025 /* Add the maximum amount of space pushed onto the stack. */
1026 if (current_function_pushed_stack_size > 0)
1028 stack_usage += current_function_pushed_stack_size;
1029 stack_usage_kind = DYNAMIC_BOUNDED;
1032 /* Now on to the tricky part: dynamic stack allocation. */
1033 if (current_function_allocates_dynamic_stack_space)
1035 if (current_function_has_unbounded_dynamic_stack_size)
1036 stack_usage_kind = DYNAMIC;
1038 stack_usage_kind = DYNAMIC_BOUNDED;
1040 /* Add the size even in the unbounded case, this can't hurt. */
1041 stack_usage += current_function_dynamic_stack_size;
1044 if (flag_stack_usage)
1046 expanded_location loc
1047 = expand_location (DECL_SOURCE_LOCATION (current_function_decl));
1048 /* We don't want to print the full qualified name because it can be long,
1049 so we strip the scope prefix, but we may need to deal with the suffix
1050 created by the compiler. */
1052 = strchr (IDENTIFIER_POINTER (DECL_NAME (current_function_decl)), '.');
1054 = lang_hooks.decl_printable_name (current_function_decl, 2);
1057 const char *dot = strchr (name, '.');
1058 while (dot && strcasecmp (dot, suffix) != 0)
1061 dot = strchr (name, '.');
1066 const char *dot = strrchr (name, '.');
1071 fprintf (stack_usage_file,
1072 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC"\t%s\n",
1073 lbasename (loc.file),
1078 stack_usage_kind_str[stack_usage_kind]);
1081 if (warn_stack_usage >= 0)
1083 const location_t loc = DECL_SOURCE_LOCATION (current_function_decl);
1085 if (stack_usage_kind == DYNAMIC)
1086 warning_at (loc, OPT_Wstack_usage_, "stack usage might be unbounded");
1087 else if (stack_usage > warn_stack_usage)
1089 if (stack_usage_kind == DYNAMIC_BOUNDED)
1091 OPT_Wstack_usage_, "stack usage might be %wd bytes",
1094 warning_at (loc, OPT_Wstack_usage_, "stack usage is %wd bytes",
1100 /* Open an auxiliary output file. */
1102 open_auxiliary_file (const char *ext)
1107 filename = concat (aux_base_name, ".", ext, NULL);
1108 file = fopen (filename, "w");
1110 fatal_error ("can%'t open %s for writing: %m", filename);
1115 /* Initialization of the front end environment, before command line
1116 options are parsed. Signal handlers, internationalization etc.
1117 ARGV0 is main's argv[0]. */
1119 general_init (const char *argv0)
1123 p = argv0 + strlen (argv0);
1124 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1128 xmalloc_set_program_name (progname);
1132 /* Unlock the stdio streams. */
1133 unlock_std_streams ();
1135 gcc_init_libintl ();
1137 identifier_to_locale_alloc = alloc_for_identifier_to_locale;
1138 identifier_to_locale_free = ggc_free;
1140 /* Initialize the diagnostics reporting machinery, so option parsing
1141 can give warnings and errors. */
1142 diagnostic_initialize (global_dc, N_OPTS);
1143 /* Set a default printer. Language specific initializations will
1144 override it later. */
1145 tree_diagnostics_defaults (global_dc);
1147 global_dc->show_caret
1148 = global_options_init.x_flag_diagnostics_show_caret;
1149 global_dc->show_option_requested
1150 = global_options_init.x_flag_diagnostics_show_option;
1151 global_dc->show_column
1152 = global_options_init.x_flag_show_column;
1153 global_dc->internal_error = plugins_internal_error_function;
1154 global_dc->option_enabled = option_enabled;
1155 global_dc->option_state = &global_options;
1156 global_dc->option_name = option_name;
1158 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1160 signal (SIGSEGV, crash_signal);
1163 signal (SIGILL, crash_signal);
1166 signal (SIGBUS, crash_signal);
1169 signal (SIGABRT, crash_signal);
1171 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1172 signal (SIGIOT, crash_signal);
1175 signal (SIGFPE, crash_signal);
1178 /* Other host-specific signal setup. */
1179 (*host_hooks.extra_signals)();
1181 /* Initialize the garbage-collector, string pools and tree type hash
1185 input_location = UNKNOWN_LOCATION;
1186 line_table = ggc_alloc<line_maps> ();
1187 linemap_init (line_table, BUILTINS_LOCATION);
1188 line_table->reallocator = realloc_for_line_map;
1189 line_table->round_alloc_size = ggc_round_alloc_size;
1192 /* Initialize register usage now so switches may override. */
1195 /* Register the language-independent parameters. */
1196 global_init_params ();
1198 /* This must be done after global_init_params but before argument
1200 init_ggc_heuristics ();
1202 /* Create the singleton holder for global state.
1203 Doing so also creates the pass manager and with it the passes. */
1204 g = new gcc::context ();
1205 symtab = ggc_cleared_alloc <symbol_table> ();
1207 statistics_early_init ();
1211 /* Return true if the current target supports -fsection-anchors. */
1214 target_supports_section_anchors_p (void)
1216 if (targetm.min_anchor_offset == 0 && targetm.max_anchor_offset == 0)
1219 if (targetm.asm_out.output_anchor == NULL)
1225 /* Default the align_* variables to 1 if they're still unset, and
1226 set up the align_*_log variables. */
1228 init_alignments (void)
1230 if (align_loops <= 0)
1232 if (align_loops_max_skip > align_loops)
1233 align_loops_max_skip = align_loops - 1;
1234 align_loops_log = floor_log2 (align_loops * 2 - 1);
1235 if (align_jumps <= 0)
1237 if (align_jumps_max_skip > align_jumps)
1238 align_jumps_max_skip = align_jumps - 1;
1239 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1240 if (align_labels <= 0)
1242 align_labels_log = floor_log2 (align_labels * 2 - 1);
1243 if (align_labels_max_skip > align_labels)
1244 align_labels_max_skip = align_labels - 1;
1245 if (align_functions <= 0)
1246 align_functions = 1;
1247 align_functions_log = floor_log2 (align_functions * 2 - 1);
1250 /* Process the options that have been parsed. */
1252 process_options (void)
1254 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1255 This can happen with incorrect pre-processed input. */
1256 debug_hooks = &do_nothing_debug_hooks;
1258 maximum_field_alignment = initial_max_fld_align * BITS_PER_UNIT;
1260 /* Default to -fdiagnostics-color=auto if GCC_COLORS is in the environment,
1261 otherwise default to -fdiagnostics-color=never. */
1262 if (!global_options_set.x_flag_diagnostics_show_color
1263 && getenv ("GCC_COLORS"))
1264 pp_show_color (global_dc->printer)
1265 = colorize_init (DIAGNOSTICS_COLOR_AUTO);
1267 /* Allow the front end to perform consistency checks and do further
1268 initialization based on the command line options. This hook also
1269 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1270 so we can correctly initialize debug output. */
1271 no_backend = lang_hooks.post_options (&main_input_filename);
1273 /* Set default values for parameters relation to the Scalar Reduction
1274 of Aggregates passes (SRA and IP-SRA). We must do this here, rather
1275 than in opts.c:default_options_optimization as historically these
1276 tuning heuristics have been based on MOVE_RATIO, which on some
1277 targets requires other symbols from the backend. */
1278 maybe_set_param_value
1279 (PARAM_SRA_MAX_SCALARIZATION_SIZE_SPEED,
1280 get_move_ratio (true) * UNITS_PER_WORD,
1281 global_options.x_param_values, global_options_set.x_param_values);
1282 maybe_set_param_value
1283 (PARAM_SRA_MAX_SCALARIZATION_SIZE_SIZE,
1284 get_move_ratio (false) * UNITS_PER_WORD,
1285 global_options.x_param_values, global_options_set.x_param_values);
1287 /* Some machines may reject certain combinations of options. */
1288 targetm.target_option.override ();
1290 /* Avoid any informative notes in the second run of -fcompare-debug. */
1291 if (flag_compare_debug)
1292 diagnostic_inhibit_notes (global_dc);
1294 if (flag_section_anchors && !target_supports_section_anchors_p ())
1296 warning (OPT_fsection_anchors,
1297 "this target does not support %qs", "-fsection-anchors");
1298 flag_section_anchors = 0;
1301 if (flag_short_enums == 2)
1302 flag_short_enums = targetm.default_short_enums ();
1304 /* Set aux_base_name if not already set. */
1307 else if (main_input_filename)
1309 char *name = xstrdup (lbasename (main_input_filename));
1311 strip_off_ending (name, strlen (name));
1312 aux_base_name = name;
1315 aux_base_name = "gccaux";
1319 || flag_graphite_identity
1321 || flag_loop_interchange
1322 || flag_loop_strip_mine
1323 || flag_loop_parallelize_all)
1324 sorry ("Graphite loop optimizations cannot be used (ISL is not available)"
1325 "(-fgraphite, -fgraphite-identity, -floop-block, "
1326 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1327 "and -ftree-loop-linear)");
1330 if (flag_check_pointer_bounds)
1332 if (targetm.chkp_bound_mode () == VOIDmode)
1333 error ("-fcheck-pointer-bounds is not supported for this target");
1336 /* One region RA really helps to decrease the code size. */
1337 if (flag_ira_region == IRA_REGION_AUTODETECT)
1339 = optimize_size || !optimize ? IRA_REGION_ONE : IRA_REGION_MIXED;
1341 if (!abi_version_at_least (2))
1343 /* -fabi-version=1 support was removed after GCC 4.9. */
1344 error ("%<-fabi-version=1%> is no longer supported");
1345 flag_abi_version = 2;
1348 /* Unrolling all loops implies that standard loop unrolling must also
1350 if (flag_unroll_all_loops)
1351 flag_unroll_loops = 1;
1353 /* web and rename-registers help when run after loop unrolling. */
1354 if (flag_web == AUTODETECT_VALUE)
1355 flag_web = flag_unroll_loops || flag_peel_loops;
1357 if (flag_rename_registers == AUTODETECT_VALUE)
1358 flag_rename_registers = flag_unroll_loops || flag_peel_loops;
1360 if (flag_non_call_exceptions)
1361 flag_asynchronous_unwind_tables = 1;
1362 if (flag_asynchronous_unwind_tables)
1363 flag_unwind_tables = 1;
1365 if (flag_value_profile_transformations)
1366 flag_profile_values = 1;
1368 /* Warn about options that are not supported on this machine. */
1369 #ifndef INSN_SCHEDULING
1370 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1371 warning (0, "instruction scheduling not supported on this target machine");
1374 if (flag_delayed_branch)
1375 warning (0, "this target machine does not have delayed branches");
1378 user_label_prefix = USER_LABEL_PREFIX;
1379 if (flag_leading_underscore != -1)
1381 /* If the default prefix is more complicated than "" or "_",
1382 issue a warning and ignore this option. */
1383 if (user_label_prefix[0] == 0 ||
1384 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1386 user_label_prefix = flag_leading_underscore ? "_" : "";
1389 warning (0, "-f%sleading-underscore not supported on this target machine",
1390 flag_leading_underscore ? "" : "no-");
1393 /* If we are in verbose mode, write out the version and maybe all the
1394 option flags in use. */
1397 print_version (stderr, "");
1399 print_switch_values (print_to_stderr);
1402 if (flag_syntax_only)
1404 write_symbols = NO_DEBUG;
1410 if (debug_info_level == DINFO_LEVEL_NONE)
1412 debug_info_level = DINFO_LEVEL_NORMAL;
1414 if (write_symbols == NO_DEBUG)
1415 write_symbols = PREFERRED_DEBUGGING_TYPE;
1418 debug_info_level = DINFO_LEVEL_NONE;
1421 if (flag_dump_final_insns && !flag_syntax_only && !no_backend)
1423 FILE *final_output = fopen (flag_dump_final_insns, "w");
1426 error ("could not open final insn dump file %qs: %m",
1427 flag_dump_final_insns);
1428 flag_dump_final_insns = NULL;
1430 else if (fclose (final_output))
1432 error ("could not close zeroed insn dump file %qs: %m",
1433 flag_dump_final_insns);
1434 flag_dump_final_insns = NULL;
1438 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1440 if (debug_info_level == DINFO_LEVEL_NONE)
1441 write_symbols = NO_DEBUG;
1443 if (write_symbols == NO_DEBUG)
1445 #if defined(DBX_DEBUGGING_INFO)
1446 else if (write_symbols == DBX_DEBUG)
1447 debug_hooks = &dbx_debug_hooks;
1449 #if defined(XCOFF_DEBUGGING_INFO)
1450 else if (write_symbols == XCOFF_DEBUG)
1451 debug_hooks = &xcoff_debug_hooks;
1453 #ifdef SDB_DEBUGGING_INFO
1454 else if (write_symbols == SDB_DEBUG)
1455 debug_hooks = &sdb_debug_hooks;
1457 #ifdef DWARF2_DEBUGGING_INFO
1458 else if (write_symbols == DWARF2_DEBUG)
1459 debug_hooks = &dwarf2_debug_hooks;
1461 #ifdef VMS_DEBUGGING_INFO
1462 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1463 debug_hooks = &vmsdbg_debug_hooks;
1466 error ("target system does not support the \"%s\" debug format",
1467 debug_type_names[write_symbols]);
1469 /* We know which debug output will be used so we can set flag_var_tracking
1470 and flag_var_tracking_uninit if the user has not specified them. */
1471 if (debug_info_level < DINFO_LEVEL_NORMAL
1472 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
1474 if (flag_var_tracking == 1
1475 || flag_var_tracking_uninit == 1)
1477 if (debug_info_level < DINFO_LEVEL_NORMAL)
1478 warning (0, "variable tracking requested, but useless unless "
1479 "producing debug info");
1481 warning (0, "variable tracking requested, but not supported "
1482 "by this debug format");
1484 flag_var_tracking = 0;
1485 flag_var_tracking_uninit = 0;
1488 /* The debug hooks are used to implement -fdump-go-spec because it
1489 gives a simple and stable API for all the information we need to
1491 if (flag_dump_go_spec != NULL)
1492 debug_hooks = dump_go_spec_init (flag_dump_go_spec, debug_hooks);
1494 /* If the user specifically requested variable tracking with tagging
1495 uninitialized variables, we need to turn on variable tracking.
1496 (We already determined above that variable tracking is feasible.) */
1497 if (flag_var_tracking_uninit == 1)
1498 flag_var_tracking = 1;
1500 if (flag_var_tracking == AUTODETECT_VALUE)
1501 flag_var_tracking = optimize >= 1;
1503 if (flag_var_tracking_uninit == AUTODETECT_VALUE)
1504 flag_var_tracking_uninit = flag_var_tracking;
1506 if (flag_var_tracking_assignments == AUTODETECT_VALUE)
1507 flag_var_tracking_assignments = flag_var_tracking
1508 && !(flag_selective_scheduling || flag_selective_scheduling2);
1510 if (flag_var_tracking_assignments_toggle)
1511 flag_var_tracking_assignments = !flag_var_tracking_assignments;
1513 if (flag_var_tracking_assignments && !flag_var_tracking)
1514 flag_var_tracking = flag_var_tracking_assignments = -1;
1516 if (flag_var_tracking_assignments
1517 && (flag_selective_scheduling || flag_selective_scheduling2))
1518 warning (0, "var-tracking-assignments changes selective scheduling");
1520 if (flag_tree_cselim == AUTODETECT_VALUE)
1521 #ifdef HAVE_conditional_move
1522 flag_tree_cselim = 1;
1524 flag_tree_cselim = 0;
1527 /* If auxiliary info generation is desired, open the output file.
1528 This goes in the same directory as the source file--unlike
1529 all the other output files. */
1530 if (flag_gen_aux_info)
1532 aux_info_file = fopen (aux_info_file_name, "w");
1533 if (aux_info_file == 0)
1534 fatal_error ("can%'t open %s: %m", aux_info_file_name);
1537 if (!targetm_common.have_named_sections)
1539 if (flag_function_sections)
1541 warning (0, "-ffunction-sections not supported for this target");
1542 flag_function_sections = 0;
1544 if (flag_data_sections)
1546 warning (0, "-fdata-sections not supported for this target");
1547 flag_data_sections = 0;
1551 #ifndef HAVE_prefetch
1552 if (flag_prefetch_loop_arrays > 0)
1554 warning (0, "-fprefetch-loop-arrays not supported for this target");
1555 flag_prefetch_loop_arrays = 0;
1558 if (flag_prefetch_loop_arrays > 0 && !HAVE_prefetch)
1560 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1561 flag_prefetch_loop_arrays = 0;
1565 /* This combination of options isn't handled for i386 targets and doesn't
1566 make much sense anyway, so don't allow it. */
1567 if (flag_prefetch_loop_arrays > 0 && optimize_size)
1569 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1570 flag_prefetch_loop_arrays = 0;
1573 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1574 if (flag_signaling_nans)
1575 flag_trapping_math = 1;
1577 /* We cannot reassociate if we want traps or signed zeros. */
1578 if (flag_associative_math && (flag_trapping_math || flag_signed_zeros))
1580 warning (0, "-fassociative-math disabled; other options take precedence");
1581 flag_associative_math = 0;
1584 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1585 if (flag_cx_limited_range)
1586 flag_complex_method = 0;
1588 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1589 if (flag_cx_fortran_rules)
1590 flag_complex_method = 1;
1592 /* Targets must be able to place spill slots at lower addresses. If the
1593 target already uses a soft frame pointer, the transition is trivial. */
1594 if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
1596 warning (0, "-fstack-protector not supported for this target");
1597 flag_stack_protect = 0;
1599 if (!flag_stack_protect)
1600 warn_stack_protect = 0;
1602 /* Address Sanitizer needs porting to each target architecture. */
1604 if ((flag_sanitize & SANITIZE_ADDRESS)
1605 && !FRAME_GROWS_DOWNWARD)
1608 "-fsanitize=address and -fsanitize=kernel-address "
1609 "are not supported for this target");
1610 flag_sanitize &= ~SANITIZE_ADDRESS;
1613 if ((flag_sanitize & SANITIZE_USER_ADDRESS)
1614 && targetm.asan_shadow_offset == NULL)
1616 warning (0, "-fsanitize=address not supported for this target");
1617 flag_sanitize &= ~SANITIZE_ADDRESS;
1620 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1621 have not been set. */
1622 if (!global_options_set.x_warnings_are_errors
1623 && warn_coverage_mismatch
1624 && (global_dc->classify_diagnostic[OPT_Wcoverage_mismatch] ==
1626 diagnostic_classify_diagnostic (global_dc, OPT_Wcoverage_mismatch,
1627 DK_ERROR, UNKNOWN_LOCATION);
1629 /* Save the current optimization options. */
1630 optimization_default_node = build_optimization_node (&global_options);
1631 optimization_current_node = optimization_default_node;
1634 /* This function can be called multiple times to reinitialize the compiler
1635 back end when register classes or instruction sets have changed,
1636 before each function. */
1638 backend_init_target (void)
1640 /* Initialize alignment variables. */
1643 /* This depends on stack_pointer_rtx. */
1644 init_fake_stack_mems ();
1646 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1648 init_alias_target ();
1650 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1653 /* Depends on the enabled attribute. */
1656 /* The following initialization functions need to generate rtl, so
1657 provide a dummy function context for them. */
1658 init_dummy_function_start ();
1660 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1661 on a mode change. */
1663 init_lower_subreg ();
1666 init_expr_target ();
1669 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1670 after a mode change as well. */
1671 caller_save_initialized_p = false;
1673 expand_dummy_function_end ();
1676 /* Initialize the compiler back end. This function is called only once,
1677 when starting the compiler. */
1684 init_inline_once ();
1685 init_varasm_once ();
1686 save_register_info ();
1688 /* Middle end needs this initialization for default mem attributes
1689 used by early calls to make_decl_rtl. */
1692 /* Middle end needs this initialization for mode tables used to assign
1693 modes to vector variables. */
1697 /* Initialize excess precision settings. */
1699 init_excess_precision (void)
1701 /* Adjust excess precision handling based on the target options. If
1702 the front end cannot handle it, flag_excess_precision_cmdline
1703 will already have been set accordingly in the post_options
1705 gcc_assert (flag_excess_precision_cmdline != EXCESS_PRECISION_DEFAULT);
1706 flag_excess_precision = flag_excess_precision_cmdline;
1707 if (flag_unsafe_math_optimizations)
1708 flag_excess_precision = EXCESS_PRECISION_FAST;
1709 if (flag_excess_precision == EXCESS_PRECISION_STANDARD)
1711 int flt_eval_method = TARGET_FLT_EVAL_METHOD;
1712 switch (flt_eval_method)
1716 /* Either the target acts unpredictably (-1) or has all the
1717 operations required not to have excess precision (0). */
1718 flag_excess_precision = EXCESS_PRECISION_FAST;
1722 /* In these cases, predictable excess precision makes
1726 /* Any other implementation-defined FLT_EVAL_METHOD values
1727 require the compiler to handle the associated excess
1728 precision rules in excess_precision_type. */
1734 /* Initialize things that are both lang-dependent and target-dependent.
1735 This function can be called more than once if target parameters change. */
1737 lang_dependent_init_target (void)
1739 /* This determines excess precision settings. */
1740 init_excess_precision ();
1742 /* This creates various _DECL nodes, so needs to be called after the
1743 front end is initialized. It also depends on the HAVE_xxx macros
1744 generated from the target machine description. */
1747 gcc_assert (!this_target_rtl->target_specific_initialized);
1750 /* Perform initializations that are lang-dependent or target-dependent.
1751 but matters only for late optimizations and RTL generation. */
1753 static int rtl_initialized;
1756 initialize_rtl (void)
1758 /* Initialization done just once per compilation, but delayed
1759 till code generation. */
1760 if (!rtl_initialized)
1762 rtl_initialized = true;
1764 /* Target specific RTL backend initialization. */
1765 if (!this_target_rtl->target_specific_initialized)
1767 backend_init_target ();
1768 this_target_rtl->target_specific_initialized = true;
1772 /* Language-dependent initialization. Returns nonzero on success. */
1774 lang_dependent_init (const char *name)
1776 location_t save_loc = input_location;
1777 if (dump_base_name == 0)
1778 dump_base_name = name && name[0] ? name : "gccdump";
1780 /* Other front-end initialization. */
1781 input_location = BUILTINS_LOCATION;
1782 if (lang_hooks.init () == 0)
1784 input_location = save_loc;
1788 init_asm_output (name);
1790 /* If stack usage information is desired, open the output file. */
1791 if (flag_stack_usage)
1792 stack_usage_file = open_auxiliary_file ("su");
1795 /* This creates various _DECL nodes, so needs to be called after the
1796 front end is initialized. */
1799 /* Do the target-specific parts of the initialization. */
1800 lang_dependent_init_target ();
1804 /* If dbx symbol table desired, initialize writing it and output the
1805 predefined types. */
1806 timevar_push (TV_SYMOUT);
1808 /* Now we have the correct original filename, we can initialize
1810 (*debug_hooks->init) (name);
1812 timevar_pop (TV_SYMOUT);
1819 /* Reinitialize everything when target parameters, such as register usage,
1822 target_reinit (void)
1824 struct rtl_data saved_x_rtl;
1825 rtx *saved_regno_reg_rtx;
1826 tree saved_optimization_current_node;
1827 struct target_optabs *saved_this_fn_optabs;
1829 /* Temporarily switch to the default optimization node, so that
1830 *this_target_optabs is set to the default, not reflecting
1831 whatever a previous function used for the optimize
1833 saved_optimization_current_node = optimization_current_node;
1834 saved_this_fn_optabs = this_fn_optabs;
1835 if (saved_optimization_current_node != optimization_default_node)
1837 optimization_current_node = optimization_default_node;
1838 cl_optimization_restore
1840 TREE_OPTIMIZATION (optimization_default_node));
1842 this_fn_optabs = this_target_optabs;
1844 /* Save *crtl and regno_reg_rtx around the reinitialization
1845 to allow target_reinit being called even after prepare_function_start. */
1846 saved_regno_reg_rtx = regno_reg_rtx;
1847 if (saved_regno_reg_rtx)
1849 saved_x_rtl = *crtl;
1850 memset (crtl, '\0', sizeof (*crtl));
1851 regno_reg_rtx = NULL;
1854 this_target_rtl->target_specific_initialized = false;
1856 /* This initializes hard_frame_pointer, and calls init_reg_modes_target()
1857 to initialize reg_raw_mode[]. */
1860 /* This invokes target hooks to set fixed_reg[] etc, which is
1864 /* Reinitialize lang-dependent parts. */
1865 lang_dependent_init_target ();
1867 /* Restore the original optimization node. */
1868 if (saved_optimization_current_node != optimization_default_node)
1870 optimization_current_node = saved_optimization_current_node;
1871 cl_optimization_restore (&global_options,
1872 TREE_OPTIMIZATION (optimization_current_node));
1874 this_fn_optabs = saved_this_fn_optabs;
1876 /* Restore regno_reg_rtx at the end, as free_after_compilation from
1877 expand_dummy_function_end clears it. */
1878 if (saved_regno_reg_rtx)
1880 *crtl = saved_x_rtl;
1881 regno_reg_rtx = saved_regno_reg_rtx;
1882 saved_regno_reg_rtx = NULL;
1887 dump_memory_report (bool final)
1889 dump_line_table_statistics ();
1890 ggc_print_statistics ();
1891 stringpool_statistics ();
1892 dump_tree_statistics ();
1893 dump_gimple_statistics ();
1894 dump_rtx_statistics ();
1895 dump_alloc_pool_statistics ();
1896 dump_bitmap_statistics ();
1897 dump_vec_loc_statistics ();
1898 dump_ggc_loc_statistics (final);
1899 dump_alias_stats (stderr);
1900 dump_pta_stats (stderr);
1903 /* Clean up: close opened files, etc. */
1906 finalize (bool no_backend)
1908 /* Close the dump files. */
1909 if (flag_gen_aux_info)
1911 fclose (aux_info_file);
1913 unlink (aux_info_file_name);
1916 /* Close non-debugging input and output files. Take special care to note
1917 whether fclose returns an error, since the pages might still be on the
1918 buffer chain while the file is open. */
1922 if (ferror (asm_out_file) != 0)
1923 fatal_error ("error writing to %s: %m", asm_file_name);
1924 if (fclose (asm_out_file) != 0)
1925 fatal_error ("error closing %s: %m", asm_file_name);
1928 if (stack_usage_file)
1929 fclose (stack_usage_file);
1935 g->get_passes ()->finish_optimization_passes ();
1941 dump_memory_report (true);
1944 dump_profile_report ();
1946 /* Language-specific end of compilation actions. */
1947 lang_hooks.finish ();
1951 standard_type_bitsize (int bitsize)
1953 /* As a special exception, we always want __int128 enabled if possible. */
1956 if (bitsize == CHAR_TYPE_SIZE
1957 || bitsize == SHORT_TYPE_SIZE
1958 || bitsize == INT_TYPE_SIZE
1959 || bitsize == LONG_TYPE_SIZE
1960 || bitsize == LONG_LONG_TYPE_SIZE)
1965 /* Initialize the compiler, and compile the input file. */
1971 /* Don't do any more if an error has already occurred. */
1976 timevar_start (TV_PHASE_SETUP);
1978 /* This must be run always, because it is needed to compute the FP
1979 predefined macros, such as __LDBL_MAX__, for targets using non
1980 default FP formats. */
1981 init_adjust_machine_modes ();
1982 init_derived_machine_modes ();
1984 /* This must happen after the backend has a chance to process
1985 command line options, but before the parsers are
1987 for (i = 0; i < NUM_INT_N_ENTS; i ++)
1988 if (targetm.scalar_mode_supported_p (int_n_data[i].m)
1989 && ! standard_type_bitsize (int_n_data[i].bitsize))
1990 int_n_enabled_p[i] = true;
1992 int_n_enabled_p[i] = false;
1994 /* Set up the back-end if requested. */
1998 /* Language-dependent initialization. Returns true on success. */
1999 if (lang_dependent_init (main_input_filename))
2001 /* Initialize yet another pass. */
2003 ggc_protect_identifiers = true;
2005 symtab->initialize ();
2006 init_final (main_input_filename);
2007 coverage_init (aux_base_name);
2009 invoke_plugin_callbacks (PLUGIN_START_UNIT, NULL);
2011 timevar_stop (TV_PHASE_SETUP);
2017 timevar_stop (TV_PHASE_SETUP);
2020 timevar_start (TV_PHASE_FINALIZE);
2022 finalize (no_backend);
2024 timevar_stop (TV_PHASE_FINALIZE);
2028 toplev::toplev (bool use_TV_TOTAL)
2029 : m_use_TV_TOTAL (use_TV_TOTAL)
2031 if (!m_use_TV_TOTAL)
2037 timevar_stop (TV_TOTAL);
2038 timevar_print (stderr);
2042 toplev::start_timevars ()
2044 if (time_report || !quiet_flag || flag_detailed_statistics)
2047 timevar_start (TV_TOTAL);
2050 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2051 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2052 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2054 It is not safe to call this function more than once. */
2057 toplev::main (int argc, char **argv)
2059 /* Parsing and gimplification sometimes need quite large stack.
2060 Increase stack size limits if possible. */
2061 stack_limit_increase (64 * 1024 * 1024);
2063 expandargv (&argc, &argv);
2065 /* Initialization of GCC's environment, and diagnostics. */
2066 general_init (argv[0]);
2068 /* One-off initialization of options that does not need to be
2069 repeated when options are added for particular functions. */
2070 init_options_once ();
2072 /* Initialize global options structures; this must be repeated for
2073 each structure used for parsing options. */
2074 init_options_struct (&global_options, &global_options_set);
2075 lang_hooks.init_options_struct (&global_options);
2077 /* Convert the options to an array. */
2078 decode_cmdline_options_to_array_default_mask (argc,
2079 CONST_CAST2 (const char **,
2081 &save_decoded_options,
2082 &save_decoded_options_count);
2084 /* Perform language-specific options initialization. */
2085 lang_hooks.init_options (save_decoded_options_count, save_decoded_options);
2087 /* Parse the options and do minimal processing; basically just
2088 enough to default flags appropriately. */
2089 decode_options (&global_options, &global_options_set,
2090 save_decoded_options, save_decoded_options_count,
2091 UNKNOWN_LOCATION, global_dc);
2093 handle_common_deferred_options ();
2097 initialize_plugins ();
2100 print_version (stderr, "");
2103 print_plugins_help (stderr, "");
2105 /* Exit early if we can (e.g. -help). */
2106 if (!exit_after_options)
2113 if (warningcount || errorcount || werrorcount)
2114 print_ignored_options ();
2116 /* Invoke registered plugin callbacks if any. Some plugins could
2117 emit some diagnostics here. */
2118 invoke_plugin_callbacks (PLUGIN_FINISH, NULL);
2120 diagnostic_finish (global_dc);
2122 finalize_plugins ();
2123 location_adhoc_data_fini (line_table);
2124 if (seen_error () || werrorcount)
2125 return (FATAL_EXIT_CODE);
2127 return (SUCCESS_EXIT_CODE);
2130 /* For those that want to, this function aims to clean up enough state that
2131 you can call toplev::main again. */
2133 toplev::finalize (void)
2135 rtl_initialized = false;
2136 this_target_rtl->target_specific_initialized = false;
2138 cgraph_c_finalize ();
2139 cgraphunit_c_finalize ();
2140 dwarf2out_c_finalize ();
2142 ipa_cp_c_finalize ();
2143 ipa_reference_c_finalize ();
2144 params_c_finalize ();