1 /* Top level of GCC compilers (cc1, cc1plus, etc.)
2 Copyright (C) 1987-2015 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"
90 #include "pass_manager.h"
91 #include "auto-profile.h"
92 #include "dwarf2out.h"
94 #include "ipa-reference.h"
95 #include "symbol-summary.h"
98 #include "insn-codes.h"
100 #include "tree-chkp.h"
103 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
107 #ifdef SDB_DEBUGGING_INFO
111 #ifdef XCOFF_DEBUGGING_INFO
112 #include "xcoffout.h" /* Needed for external data
113 declarations for e.g. AIX 4.x. */
116 #ifndef HAVE_epilogue
117 #define HAVE_epilogue 0
119 #ifndef HAVE_prologue
120 #define HAVE_prologue 0
125 static void general_init (const char *);
126 static void do_compile ();
127 static void process_options (void);
128 static void backend_init (void);
129 static int lang_dependent_init (const char *);
130 static void init_asm_output (const char *);
131 static void finalize (bool);
133 static void crash_signal (int) ATTRIBUTE_NORETURN;
134 static void compile_file (void);
136 /* True if we don't need a backend (e.g. preprocessing only). */
137 static bool no_backend;
139 /* Length of line when printing switch values. */
142 /* Decoded options, and number of such options. */
143 struct cl_decoded_option *save_decoded_options;
144 unsigned int save_decoded_options_count;
146 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
147 to optimize in process_options (). */
148 #define AUTODETECT_VALUE 2
150 /* Debug hooks - dependent upon command line options. */
152 const struct gcc_debug_hooks *debug_hooks;
154 /* The FUNCTION_DECL for the function currently being compiled,
155 or 0 if between functions. */
156 tree current_function_decl;
158 /* Set to the FUNC_BEGIN label of the current function, or NULL
160 const char * current_function_func_begin_label;
162 /* A random sequence of characters, unless overridden by user. */
163 static const char *flag_random_seed;
165 /* A local time stamp derived from the time of compilation. It will be
166 zero if the system cannot provide a time. It will be -1u, if the
167 user has specified a particular random seed. */
170 /* Random number for this compilation */
171 HOST_WIDE_INT random_seed;
175 /* When non-NULL, indicates that whenever space is allocated on the
176 stack, the resulting stack pointer must not pass this
177 address---that is, for stacks that grow downward, the stack pointer
178 must always be greater than or equal to this address; for stacks
179 that grow upward, the stack pointer must be less than this address.
180 At present, the rtx may be either a REG or a SYMBOL_REF, although
181 the support provided depends on the backend. */
184 /* True if the user has tagged the function with the 'section'
187 bool user_defined_section_attribute = false;
189 struct target_flag_state default_target_flag_state;
190 #if SWITCHABLE_TARGET
191 struct target_flag_state *this_target_flag_state = &default_target_flag_state;
193 #define this_target_flag_state (&default_target_flag_state)
196 /* The user symbol prefix after having resolved same. */
197 const char *user_label_prefix;
199 /* Output files for assembler code (real compiler output)
200 and debugging dumps. */
204 FILE *stack_usage_file = NULL;
206 /* The current working directory of a translation. It's generally the
207 directory from which compilation was initiated, but a preprocessed
208 file may specify the original directory in which it was
211 static const char *src_pwd;
213 /* Initialize src_pwd with the given string, and return true. If it
214 was already initialized, return false. As a special case, it may
215 be called with a NULL argument to test whether src_pwd has NOT been
219 set_src_pwd (const char *pwd)
223 if (strcmp (src_pwd, pwd) == 0)
229 src_pwd = xstrdup (pwd);
233 /* Return the directory from which the translation unit was initiated,
234 in case set_src_pwd() was not called before to assign it a
250 /* Called when the start of a function definition is parsed,
251 this function prints on stderr the name of the function. */
253 announce_function (tree decl)
257 if (rtl_dump_and_exit)
258 fprintf (stderr, "%s ",
259 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl))));
261 fprintf (stderr, " %s",
262 identifier_to_locale (lang_hooks.decl_printable_name (decl, 2)));
264 pp_needs_newline (global_dc->printer) = true;
265 diagnostic_set_last_function (global_dc, (diagnostic_info *) NULL);
269 /* Initialize local_tick with a random number or -1 if
270 flag_random_seed is set. */
273 init_local_tick (void)
275 if (!flag_random_seed)
277 /* Try urandom first. Time of day is too likely to collide.
278 In case of any error we just use the local tick. */
280 int fd = open ("/dev/urandom", O_RDONLY);
283 read (fd, &random_seed, sizeof (random_seed));
287 /* Now get the tick anyways */
288 #ifdef HAVE_GETTIMEOFDAY
292 gettimeofday (&tv, NULL);
293 local_tick = (unsigned) tv.tv_sec * 1000 + tv.tv_usec / 1000;
297 time_t now = time (NULL);
299 if (now != (time_t)-1)
300 local_tick = (unsigned) now;
308 /* Set up a default flag_random_seed and local_tick, unless the user
309 already specified one. Must be called after init_local_tick. */
312 init_random_seed (void)
315 random_seed = local_tick ^ getpid (); /* Old racey fallback method */
318 /* Obtain the random_seed. Unless NOINIT, initialize it if
319 it's not provided in the command line. */
322 get_random_seed (bool noinit)
324 if (!flag_random_seed && !noinit)
329 /* Modify the random_seed string to VAL. Return its previous
333 set_random_seed (const char *val)
335 const char *old = flag_random_seed;
336 flag_random_seed = val;
337 if (flag_random_seed)
341 /* When the driver passed in a hex number don't crc it again */
342 random_seed = strtoul (flag_random_seed, &endp, 0);
343 if (!(endp > flag_random_seed && *endp == 0))
344 random_seed = crc32_string (0, flag_random_seed);
349 /* Handler for fatal signals, such as SIGSEGV. These are transformed
350 into ICE messages, which is much more user friendly. In case the
351 error printer crashes, reset the signal to prevent infinite recursion. */
354 crash_signal (int signo)
356 signal (signo, SIG_DFL);
358 /* If we crashed while processing an ASM statement, then be a little more
359 graceful. It's most likely the user's fault. */
360 if (this_is_asm_operands)
362 output_operand_lossage ("unrecoverable error");
363 exit (FATAL_EXIT_CODE);
366 internal_error ("%s", strsignal (signo));
369 /* A subroutine of wrapup_global_declarations. We've come to the end of
370 the compilation unit. All deferred variables should be undeferred,
371 and all incomplete decls should be finalized. */
374 wrapup_global_declaration_1 (tree decl)
376 /* We're not deferring this any longer. Assignment is conditional to
377 avoid needlessly dirtying PCH pages. */
378 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl), TS_DECL_WITH_VIS)
379 && DECL_DEFER_OUTPUT (decl) != 0)
380 DECL_DEFER_OUTPUT (decl) = 0;
382 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
383 lang_hooks.finish_incomplete_decl (decl);
386 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
387 needs to be output. Return true if it is output. */
390 wrapup_global_declaration_2 (tree decl)
392 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl)
393 || (TREE_CODE (decl) == VAR_DECL && DECL_HAS_VALUE_EXPR_P (decl)))
396 /* Don't write out static consts, unless we still need them.
398 We also keep static consts if not optimizing (for debugging),
399 unless the user specified -fno-keep-static-consts.
400 ??? They might be better written into the debug information.
401 This is possible when using DWARF.
403 A language processor that wants static constants to be always
404 written out (even if it is not used) is responsible for
405 calling rest_of_decl_compilation itself. E.g. the C front-end
406 calls rest_of_decl_compilation from finish_decl.
407 One motivation for this is that is conventional in some
408 environments to write things like:
409 static const char rcsid[] = "... version string ...";
410 intending to force the string to be in the executable.
412 A language processor that would prefer to have unneeded
413 static constants "optimized away" would just defer writing
414 them out until here. E.g. C++ does this, because static
415 constants are often defined in header files.
417 ??? A tempting alternative (for both C and C++) would be
418 to force a constant to be written if and only if it is
419 defined in a main file, as opposed to an include file. */
421 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
425 node = varpool_node::get (decl);
427 if (!node && flag_ltrans)
429 else if (node && node->definition)
431 else if (node && node->alias)
433 else if (!symtab->global_info_ready
435 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
437 else if (node && node->analyzed)
439 else if (DECL_COMDAT (decl))
441 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
442 && (optimize || !flag_keep_static_consts
443 || DECL_ARTIFICIAL (decl)))
448 rest_of_decl_compilation (decl, 1, 1);
456 /* Do any final processing required for the declarations in VEC, of
457 which there are LEN. We write out inline functions and variables
458 that have been deferred until this point, but which are required.
459 Returns nonzero if anything was put out. */
462 wrapup_global_declarations (tree *vec, int len)
464 bool reconsider, output_something = false;
467 for (i = 0; i < len; i++)
468 wrapup_global_declaration_1 (vec[i]);
470 /* Now emit any global variables or functions that we have been
471 putting off. We need to loop in case one of the things emitted
472 here references another one which comes earlier in the list. */
476 for (i = 0; i < len; i++)
477 reconsider |= wrapup_global_declaration_2 (vec[i]);
479 output_something = true;
483 return output_something;
486 /* A subroutine of check_global_declarations. Issue appropriate warnings
487 for the global declaration DECL. */
490 check_global_declaration_1 (tree decl)
492 /* Warn about any function declared static but not defined. We don't
493 warn about variables, because many programs have static variables
494 that exist only to get some text into the object file. */
495 if (TREE_CODE (decl) == FUNCTION_DECL
496 && DECL_INITIAL (decl) == 0
497 && DECL_EXTERNAL (decl)
498 && ! DECL_ARTIFICIAL (decl)
499 && ! TREE_NO_WARNING (decl)
500 && ! TREE_PUBLIC (decl)
501 && (warn_unused_function
502 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
504 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
505 pedwarn (input_location, 0, "%q+F used but never defined", decl);
507 warning (OPT_Wunused_function, "%q+F declared %<static%> but never defined", decl);
508 /* This symbol is effectively an "extern" declaration now. */
509 TREE_PUBLIC (decl) = 1;
512 /* Warn about static fns or vars defined but not used. */
513 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
514 /* We don't warn about "static const" variables because the
515 "rcs_id" idiom uses that construction. */
516 || (warn_unused_variable
517 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
518 && ! DECL_IN_SYSTEM_HEADER (decl)
519 && ! TREE_USED (decl)
520 /* The TREE_USED bit for file-scope decls is kept in the identifier,
521 to handle multiple external decls in different scopes. */
522 && ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl)))
523 && ! DECL_EXTERNAL (decl)
524 && ! TREE_PUBLIC (decl)
525 /* A volatile variable might be used in some non-obvious way. */
526 && ! TREE_THIS_VOLATILE (decl)
527 /* Global register variables must be declared to reserve them. */
528 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
529 /* Otherwise, ask the language. */
530 && lang_hooks.decls.warn_unused_global (decl))
531 warning ((TREE_CODE (decl) == FUNCTION_DECL)
532 ? OPT_Wunused_function
533 : OPT_Wunused_variable,
534 "%q+D defined but not used", decl);
537 /* Issue appropriate warnings for the global declarations in V (of
538 which there are LEN). */
541 check_global_declarations (tree *v, int len)
545 for (i = 0; i < len; i++)
546 check_global_declaration_1 (v[i]);
549 /* Emit debugging information for all global declarations in VEC. */
552 emit_debug_global_declarations (tree *vec, int len)
556 /* Avoid confusing the debug information machinery when there are errors. */
560 timevar_push (TV_SYMOUT);
561 for (i = 0; i < len; i++)
562 debug_hooks->global_decl (vec[i]);
563 timevar_pop (TV_SYMOUT);
566 /* Compile an entire translation unit. Write a file of assembly
567 output and various debugging dumps. */
572 timevar_start (TV_PHASE_PARSING);
573 timevar_push (TV_PARSE_GLOBAL);
575 /* Call the parser, which parses the entire file (calling
576 rest_of_compilation for each function). */
577 lang_hooks.parse_file ();
579 timevar_pop (TV_PARSE_GLOBAL);
580 timevar_stop (TV_PHASE_PARSING);
582 /* Compilation is now finished except for writing
583 what's left of the symbol table output. */
585 if (flag_syntax_only || flag_wpa)
588 ggc_protect_identifiers = false;
590 /* This must also call finalize_compilation_unit. */
591 lang_hooks.decls.final_write_globals ();
596 timevar_start (TV_PHASE_LATE_ASM);
598 /* Compilation unit is finalized. When producing non-fat LTO object, we are
599 basically finished. */
600 if (in_lto_p || !flag_lto || flag_fat_lto_objects)
602 /* File-scope initialization for AddressSanitizer. */
603 if (flag_sanitize & SANITIZE_ADDRESS)
606 if (flag_sanitize & SANITIZE_THREAD)
609 if (flag_check_pointer_bounds)
614 output_shared_constant_pool ();
615 output_object_blocks ();
616 finish_tm_clone_pairs ();
618 /* Write out any pending weak symbol declarations. */
621 /* This must be at the end before unwind and debug info.
622 Some target ports emit PIC setup thunks here. */
623 targetm.asm_out.code_end ();
625 /* Do dbx symbols. */
626 timevar_push (TV_SYMOUT);
628 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
629 if (dwarf2out_do_frame ())
630 dwarf2out_frame_finish ();
633 (*debug_hooks->finish) (main_input_filename);
634 timevar_pop (TV_SYMOUT);
636 /* Output some stuff at end of file if nec. */
638 dw2_output_indirect_constants ();
640 /* Flush any pending external directives. */
641 process_pending_assemble_externals ();
644 /* Emit LTO marker if LTO info has been previously emitted. This is
645 used by collect2 to determine whether an object file contains IL.
646 We used to emit an undefined reference here, but this produces
647 link errors if an object file with IL is stored into a shared
648 library without invoking lto1. */
649 if (flag_generate_lto || flag_generate_offload)
651 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
652 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
654 (unsigned HOST_WIDE_INT) 1, 8);
655 #elif defined ASM_OUTPUT_ALIGNED_COMMON
656 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_v1",
657 (unsigned HOST_WIDE_INT) 1, 8);
659 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_v1",
660 (unsigned HOST_WIDE_INT) 1,
661 (unsigned HOST_WIDE_INT) 1);
665 /* Let linker plugin know that this is a slim object and must be LTOed
666 even when user did not ask for it. */
667 if (flag_generate_lto && !flag_fat_lto_objects)
669 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
670 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE, "__gnu_lto_slim",
671 (unsigned HOST_WIDE_INT) 1, 8);
672 #elif defined ASM_OUTPUT_ALIGNED_COMMON
673 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_slim",
674 (unsigned HOST_WIDE_INT) 1, 8);
676 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_slim",
677 (unsigned HOST_WIDE_INT) 1,
678 (unsigned HOST_WIDE_INT) 1);
682 /* Attach a special .ident directive to the end of the file to identify
683 the version of GCC which compiled this code. The format of the .ident
684 string is patterned after the ones produced by native SVR4 compilers. */
687 const char *pkg_version = "(GNU) ";
690 if (strcmp ("(GCC) ", pkgversion_string))
691 pkg_version = pkgversion_string;
693 ident_str = ACONCAT (("GCC: ", pkg_version, version_string, NULL));
694 targetm.asm_out.output_ident (ident_str);
697 /* Auto profile finalization. */
698 if (flag_auto_profile)
701 /* Invoke registered plugin callbacks. */
702 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT, NULL);
704 /* This must be at the end. Some target ports emit end of file directives
705 into the assembly file here, and hence we can not output anything to the
706 assembly file after this point. */
707 targetm.asm_out.file_end ();
709 timevar_stop (TV_PHASE_LATE_ASM);
712 /* Print version information to FILE.
713 Each line begins with INDENT (for the case where FILE is the
714 assembler output file). */
717 print_version (FILE *file, const char *indent)
719 static const char fmt1[] =
721 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
723 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
726 static const char fmt2[] =
727 N_("GMP version %s, MPFR version %s, MPC version %s\n");
728 static const char fmt3[] =
729 N_("%s%swarning: %s header version %s differs from library version %s.\n");
730 static const char fmt4[] =
731 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
733 #define __VERSION__ "[?]"
736 file == stderr ? _(fmt1) : fmt1,
737 indent, *indent != 0 ? " " : "",
738 lang_hooks.name, pkgversion_string, version_string, TARGET_NAME,
739 indent, __VERSION__);
741 /* We need to stringify the GMP macro values. Ugh, gmp_version has
742 two string formats, "i.j.k" and "i.j" when k is zero. As of
743 gmp-4.3.0, GMP always uses the 3 number format. */
744 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
745 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3 (X)
746 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
747 #define GCC_GMP_VERSION \
748 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
749 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
750 #define GCC_GMP_STRINGIFY_VERSION \
751 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
752 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR)
754 #define GCC_GMP_STRINGIFY_VERSION \
755 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
756 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR) "." \
757 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_PATCHLEVEL)
760 file == stderr ? _(fmt2) : fmt2,
761 GCC_GMP_STRINGIFY_VERSION, MPFR_VERSION_STRING, MPC_VERSION_STRING);
762 if (strcmp (GCC_GMP_STRINGIFY_VERSION, gmp_version))
764 file == stderr ? _(fmt3) : fmt3,
765 indent, *indent != 0 ? " " : "",
766 "GMP", GCC_GMP_STRINGIFY_VERSION, gmp_version);
767 if (strcmp (MPFR_VERSION_STRING, mpfr_get_version ()))
769 file == stderr ? _(fmt3) : fmt3,
770 indent, *indent != 0 ? " " : "",
771 "MPFR", MPFR_VERSION_STRING, mpfr_get_version ());
772 if (strcmp (MPC_VERSION_STRING, mpc_get_version ()))
774 file == stderr ? _(fmt3) : fmt3,
775 indent, *indent != 0 ? " " : "",
776 "MPC", MPC_VERSION_STRING, mpc_get_version ());
778 file == stderr ? _(fmt4) : fmt4,
779 indent, *indent != 0 ? " " : "",
780 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
782 print_plugins_versions (file, indent);
786 print_to_asm_out_file (print_switch_type type, const char * text)
788 bool prepend_sep = true;
792 case SWITCH_TYPE_LINE_END:
793 putc ('\n', asm_out_file);
796 case SWITCH_TYPE_LINE_START:
797 fputs (ASM_COMMENT_START, asm_out_file);
798 return strlen (ASM_COMMENT_START);
800 case SWITCH_TYPE_DESCRIPTIVE:
801 if (ASM_COMMENT_START[0] == 0)
804 case SWITCH_TYPE_PASSED:
805 case SWITCH_TYPE_ENABLED:
807 fputc (' ', asm_out_file);
808 fputs (text, asm_out_file);
809 /* No need to return the length here as
810 print_single_switch has already done it. */
819 print_to_stderr (print_switch_type type, const char * text)
823 case SWITCH_TYPE_LINE_END:
827 case SWITCH_TYPE_LINE_START:
830 case SWITCH_TYPE_PASSED:
831 case SWITCH_TYPE_ENABLED:
835 case SWITCH_TYPE_DESCRIPTIVE:
836 fputs (text, stderr);
837 /* No need to return the length here as
838 print_single_switch has already done it. */
846 /* Print an option value and return the adjusted position in the line.
847 ??? print_fn doesn't handle errors, eg disk full; presumably other
848 code will catch a disk full though. */
851 print_single_switch (print_switch_fn_type print_fn,
853 print_switch_type type,
856 /* The ultrix fprintf returns 0 on success, so compute the result
857 we want here since we need it for the following test. The +1
858 is for the separator character that will probably be emitted. */
859 int len = strlen (text) + 1;
862 && pos + len > MAX_LINE)
864 print_fn (SWITCH_TYPE_LINE_END, NULL);
869 pos += print_fn (SWITCH_TYPE_LINE_START, NULL);
871 print_fn (type, text);
875 /* Print active target switches using PRINT_FN.
876 POS is the current cursor position and MAX is the size of a "line".
877 Each line begins with INDENT and ends with TERM.
878 Each switch is separated from the next by SEP. */
881 print_switch_values (print_switch_fn_type print_fn)
886 /* Fill in the -frandom-seed option, if the user didn't pass it, so
887 that it can be printed below. This helps reproducibility. */
888 if (!flag_random_seed)
891 /* Print the options as passed. */
892 pos = print_single_switch (print_fn, pos,
893 SWITCH_TYPE_DESCRIPTIVE, _("options passed: "));
895 for (j = 1; j < save_decoded_options_count; j++)
897 switch (save_decoded_options[j].opt_index)
910 pos = print_single_switch (print_fn, pos, SWITCH_TYPE_PASSED,
911 save_decoded_options[j].orig_option_with_args_text);
915 print_fn (SWITCH_TYPE_LINE_END, NULL);
917 /* Print the -f and -m options that have been enabled.
918 We don't handle language specific options but printing argv
920 pos = print_single_switch (print_fn, 0,
921 SWITCH_TYPE_DESCRIPTIVE, _("options enabled: "));
923 for (j = 0; j < cl_options_count; j++)
924 if (cl_options[j].cl_report
925 && option_enabled (j, &global_options) > 0)
926 pos = print_single_switch (print_fn, pos,
927 SWITCH_TYPE_ENABLED, cl_options[j].opt_text);
929 print_fn (SWITCH_TYPE_LINE_END, NULL);
932 /* Open assembly code output file. Do this even if -fsyntax-only is
933 on, because then the driver will have provided the name of a
934 temporary file or bit bucket for us. NAME is the file specified on
935 the command line, possibly NULL. */
937 init_asm_output (const char *name)
939 if (name == NULL && asm_file_name == 0)
940 asm_out_file = stdout;
943 if (asm_file_name == 0)
945 int len = strlen (dump_base_name);
946 char *dumpname = XNEWVEC (char, len + 6);
948 memcpy (dumpname, dump_base_name, len + 1);
949 strip_off_ending (dumpname, len);
950 strcat (dumpname, ".s");
951 asm_file_name = dumpname;
953 if (!strcmp (asm_file_name, "-"))
954 asm_out_file = stdout;
955 else if (!canonical_filename_eq (asm_file_name, name)
956 || !strcmp (asm_file_name, HOST_BIT_BUCKET))
957 asm_out_file = fopen (asm_file_name, "w");
959 /* Use fatal_error (UNKOWN_LOCATION) instead of just fatal_error to
960 prevent gcc from printing the first line in the current file. */
961 fatal_error (UNKNOWN_LOCATION,
962 "input file %qs is the same as output file",
964 if (asm_out_file == 0)
965 fatal_error (UNKNOWN_LOCATION,
966 "can%'t open %qs for writing: %m", asm_file_name);
969 if (!flag_syntax_only)
971 targetm.asm_out.file_start ();
973 if (flag_record_gcc_switches)
975 if (targetm.asm_out.record_gcc_switches)
977 /* Let the target know that we are about to start recording. */
978 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
980 /* Now record the switches. */
981 print_switch_values (targetm.asm_out.record_gcc_switches);
982 /* Let the target know that the recording is over. */
983 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
987 inform (input_location, "-frecord-gcc-switches is not supported by the current target");
990 if (flag_verbose_asm)
992 /* Print the list of switches in effect
993 into the assembler file as comments. */
994 print_version (asm_out_file, ASM_COMMENT_START);
995 print_switch_values (print_to_asm_out_file);
996 putc ('\n', asm_out_file);
1001 /* A helper function; used as the reallocator function for cpp's line
1004 realloc_for_line_map (void *ptr, size_t len)
1006 return ggc_realloc (ptr, len);
1009 /* A helper function: used as the allocator function for
1010 identifier_to_locale. */
1012 alloc_for_identifier_to_locale (size_t len)
1014 return ggc_alloc_atomic (len);
1017 /* Output stack usage information. */
1019 output_stack_usage (void)
1021 static bool warning_issued = false;
1022 enum stack_usage_kind_type { STATIC = 0, DYNAMIC, DYNAMIC_BOUNDED };
1023 const char *stack_usage_kind_str[] = {
1028 HOST_WIDE_INT stack_usage = current_function_static_stack_size;
1029 enum stack_usage_kind_type stack_usage_kind;
1031 if (stack_usage < 0)
1033 if (!warning_issued)
1035 warning (0, "stack usage computation not supported for this target");
1036 warning_issued = true;
1041 stack_usage_kind = STATIC;
1043 /* Add the maximum amount of space pushed onto the stack. */
1044 if (current_function_pushed_stack_size > 0)
1046 stack_usage += current_function_pushed_stack_size;
1047 stack_usage_kind = DYNAMIC_BOUNDED;
1050 /* Now on to the tricky part: dynamic stack allocation. */
1051 if (current_function_allocates_dynamic_stack_space)
1053 if (current_function_has_unbounded_dynamic_stack_size)
1054 stack_usage_kind = DYNAMIC;
1056 stack_usage_kind = DYNAMIC_BOUNDED;
1058 /* Add the size even in the unbounded case, this can't hurt. */
1059 stack_usage += current_function_dynamic_stack_size;
1062 if (flag_stack_usage)
1064 expanded_location loc
1065 = expand_location (DECL_SOURCE_LOCATION (current_function_decl));
1066 /* We don't want to print the full qualified name because it can be long,
1067 so we strip the scope prefix, but we may need to deal with the suffix
1068 created by the compiler. */
1070 = strchr (IDENTIFIER_POINTER (DECL_NAME (current_function_decl)), '.');
1072 = lang_hooks.decl_printable_name (current_function_decl, 2);
1075 const char *dot = strchr (name, '.');
1076 while (dot && strcasecmp (dot, suffix) != 0)
1079 dot = strchr (name, '.');
1084 const char *dot = strrchr (name, '.');
1089 fprintf (stack_usage_file,
1090 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC"\t%s\n",
1091 lbasename (loc.file),
1096 stack_usage_kind_str[stack_usage_kind]);
1099 if (warn_stack_usage >= 0)
1101 const location_t loc = DECL_SOURCE_LOCATION (current_function_decl);
1103 if (stack_usage_kind == DYNAMIC)
1104 warning_at (loc, OPT_Wstack_usage_, "stack usage might be unbounded");
1105 else if (stack_usage > warn_stack_usage)
1107 if (stack_usage_kind == DYNAMIC_BOUNDED)
1109 OPT_Wstack_usage_, "stack usage might be %wd bytes",
1112 warning_at (loc, OPT_Wstack_usage_, "stack usage is %wd bytes",
1118 /* Open an auxiliary output file. */
1120 open_auxiliary_file (const char *ext)
1125 filename = concat (aux_base_name, ".", ext, NULL);
1126 file = fopen (filename, "w");
1128 fatal_error ("can%'t open %s for writing: %m", filename);
1133 /* Initialization of the front end environment, before command line
1134 options are parsed. Signal handlers, internationalization etc.
1135 ARGV0 is main's argv[0]. */
1137 general_init (const char *argv0)
1141 p = argv0 + strlen (argv0);
1142 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1146 xmalloc_set_program_name (progname);
1150 /* Unlock the stdio streams. */
1151 unlock_std_streams ();
1153 gcc_init_libintl ();
1155 identifier_to_locale_alloc = alloc_for_identifier_to_locale;
1156 identifier_to_locale_free = ggc_free;
1158 /* Initialize the diagnostics reporting machinery, so option parsing
1159 can give warnings and errors. */
1160 diagnostic_initialize (global_dc, N_OPTS);
1161 /* Set a default printer. Language specific initializations will
1162 override it later. */
1163 tree_diagnostics_defaults (global_dc);
1165 global_dc->show_caret
1166 = global_options_init.x_flag_diagnostics_show_caret;
1167 global_dc->show_option_requested
1168 = global_options_init.x_flag_diagnostics_show_option;
1169 global_dc->show_column
1170 = global_options_init.x_flag_show_column;
1171 global_dc->internal_error = plugins_internal_error_function;
1172 global_dc->option_enabled = option_enabled;
1173 global_dc->option_state = &global_options;
1174 global_dc->option_name = option_name;
1176 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1178 signal (SIGSEGV, crash_signal);
1181 signal (SIGILL, crash_signal);
1184 signal (SIGBUS, crash_signal);
1187 signal (SIGABRT, crash_signal);
1189 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1190 signal (SIGIOT, crash_signal);
1193 signal (SIGFPE, crash_signal);
1196 /* Other host-specific signal setup. */
1197 (*host_hooks.extra_signals)();
1199 /* Initialize the garbage-collector, string pools and tree type hash
1203 input_location = UNKNOWN_LOCATION;
1204 line_table = ggc_alloc<line_maps> ();
1205 linemap_init (line_table, BUILTINS_LOCATION);
1206 line_table->reallocator = realloc_for_line_map;
1207 line_table->round_alloc_size = ggc_round_alloc_size;
1210 /* Initialize register usage now so switches may override. */
1213 /* Register the language-independent parameters. */
1214 global_init_params ();
1216 /* This must be done after global_init_params but before argument
1218 init_ggc_heuristics ();
1220 /* Create the singleton holder for global state.
1221 Doing so also creates the pass manager and with it the passes. */
1222 g = new gcc::context ();
1223 symtab = new (ggc_cleared_alloc <symbol_table> ()) symbol_table ();
1225 statistics_early_init ();
1229 /* Return true if the current target supports -fsection-anchors. */
1232 target_supports_section_anchors_p (void)
1234 if (targetm.min_anchor_offset == 0 && targetm.max_anchor_offset == 0)
1237 if (targetm.asm_out.output_anchor == NULL)
1243 /* Default the align_* variables to 1 if they're still unset, and
1244 set up the align_*_log variables. */
1246 init_alignments (void)
1248 if (align_loops <= 0)
1250 if (align_loops_max_skip > align_loops)
1251 align_loops_max_skip = align_loops - 1;
1252 align_loops_log = floor_log2 (align_loops * 2 - 1);
1253 if (align_jumps <= 0)
1255 if (align_jumps_max_skip > align_jumps)
1256 align_jumps_max_skip = align_jumps - 1;
1257 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1258 if (align_labels <= 0)
1260 align_labels_log = floor_log2 (align_labels * 2 - 1);
1261 if (align_labels_max_skip > align_labels)
1262 align_labels_max_skip = align_labels - 1;
1263 if (align_functions <= 0)
1264 align_functions = 1;
1265 align_functions_log = floor_log2 (align_functions * 2 - 1);
1268 /* Process the options that have been parsed. */
1270 process_options (void)
1272 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1273 This can happen with incorrect pre-processed input. */
1274 debug_hooks = &do_nothing_debug_hooks;
1276 maximum_field_alignment = initial_max_fld_align * BITS_PER_UNIT;
1278 /* Allow the front end to perform consistency checks and do further
1279 initialization based on the command line options. This hook also
1280 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1281 so we can correctly initialize debug output. */
1282 no_backend = lang_hooks.post_options (&main_input_filename);
1284 /* Set default values for parameters relation to the Scalar Reduction
1285 of Aggregates passes (SRA and IP-SRA). We must do this here, rather
1286 than in opts.c:default_options_optimization as historically these
1287 tuning heuristics have been based on MOVE_RATIO, which on some
1288 targets requires other symbols from the backend. */
1289 maybe_set_param_value
1290 (PARAM_SRA_MAX_SCALARIZATION_SIZE_SPEED,
1291 get_move_ratio (true) * UNITS_PER_WORD,
1292 global_options.x_param_values, global_options_set.x_param_values);
1293 maybe_set_param_value
1294 (PARAM_SRA_MAX_SCALARIZATION_SIZE_SIZE,
1295 get_move_ratio (false) * UNITS_PER_WORD,
1296 global_options.x_param_values, global_options_set.x_param_values);
1298 /* Some machines may reject certain combinations of options. */
1299 targetm.target_option.override ();
1301 /* Avoid any informative notes in the second run of -fcompare-debug. */
1302 if (flag_compare_debug)
1303 diagnostic_inhibit_notes (global_dc);
1305 if (flag_section_anchors && !target_supports_section_anchors_p ())
1307 warning (OPT_fsection_anchors,
1308 "this target does not support %qs", "-fsection-anchors");
1309 flag_section_anchors = 0;
1312 if (flag_short_enums == 2)
1313 flag_short_enums = targetm.default_short_enums ();
1315 /* Set aux_base_name if not already set. */
1318 else if (main_input_filename)
1320 char *name = xstrdup (lbasename (main_input_filename));
1322 strip_off_ending (name, strlen (name));
1323 aux_base_name = name;
1326 aux_base_name = "gccaux";
1330 || flag_graphite_identity
1332 || flag_loop_interchange
1333 || flag_loop_strip_mine
1334 || flag_loop_parallelize_all
1335 || flag_loop_unroll_jam)
1336 sorry ("Graphite loop optimizations cannot be used (ISL is not available)"
1337 "(-fgraphite, -fgraphite-identity, -floop-block, "
1338 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1339 "-floop-unroll-and-jam, and -ftree-loop-linear)");
1342 if (flag_check_pointer_bounds)
1344 if (targetm.chkp_bound_mode () == VOIDmode)
1345 error ("-fcheck-pointer-bounds is not supported for this target");
1348 /* One region RA really helps to decrease the code size. */
1349 if (flag_ira_region == IRA_REGION_AUTODETECT)
1351 = optimize_size || !optimize ? IRA_REGION_ONE : IRA_REGION_MIXED;
1353 if (!abi_version_at_least (2))
1355 /* -fabi-version=1 support was removed after GCC 4.9. */
1356 error ("%<-fabi-version=1%> is no longer supported");
1357 flag_abi_version = 2;
1360 /* Unrolling all loops implies that standard loop unrolling must also
1362 if (flag_unroll_all_loops)
1363 flag_unroll_loops = 1;
1365 /* web and rename-registers help when run after loop unrolling. */
1366 if (flag_web == AUTODETECT_VALUE)
1367 flag_web = flag_unroll_loops || flag_peel_loops;
1369 if (flag_rename_registers == AUTODETECT_VALUE)
1370 flag_rename_registers = flag_unroll_loops || flag_peel_loops;
1372 if (flag_non_call_exceptions)
1373 flag_asynchronous_unwind_tables = 1;
1374 if (flag_asynchronous_unwind_tables)
1375 flag_unwind_tables = 1;
1377 if (flag_value_profile_transformations)
1378 flag_profile_values = 1;
1380 /* Warn about options that are not supported on this machine. */
1381 #ifndef INSN_SCHEDULING
1382 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1383 warning (0, "instruction scheduling not supported on this target machine");
1386 if (flag_delayed_branch)
1387 warning (0, "this target machine does not have delayed branches");
1390 user_label_prefix = USER_LABEL_PREFIX;
1391 if (flag_leading_underscore != -1)
1393 /* If the default prefix is more complicated than "" or "_",
1394 issue a warning and ignore this option. */
1395 if (user_label_prefix[0] == 0 ||
1396 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1398 user_label_prefix = flag_leading_underscore ? "_" : "";
1401 warning (0, "-f%sleading-underscore not supported on this target machine",
1402 flag_leading_underscore ? "" : "no-");
1405 /* If we are in verbose mode, write out the version and maybe all the
1406 option flags in use. */
1409 print_version (stderr, "");
1411 print_switch_values (print_to_stderr);
1414 if (flag_syntax_only)
1416 write_symbols = NO_DEBUG;
1422 if (debug_info_level == DINFO_LEVEL_NONE)
1424 debug_info_level = DINFO_LEVEL_NORMAL;
1426 if (write_symbols == NO_DEBUG)
1427 write_symbols = PREFERRED_DEBUGGING_TYPE;
1430 debug_info_level = DINFO_LEVEL_NONE;
1433 if (flag_dump_final_insns && !flag_syntax_only && !no_backend)
1435 FILE *final_output = fopen (flag_dump_final_insns, "w");
1438 error ("could not open final insn dump file %qs: %m",
1439 flag_dump_final_insns);
1440 flag_dump_final_insns = NULL;
1442 else if (fclose (final_output))
1444 error ("could not close zeroed insn dump file %qs: %m",
1445 flag_dump_final_insns);
1446 flag_dump_final_insns = NULL;
1450 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1452 if (debug_info_level == DINFO_LEVEL_NONE)
1453 write_symbols = NO_DEBUG;
1455 if (write_symbols == NO_DEBUG)
1457 #if defined(DBX_DEBUGGING_INFO)
1458 else if (write_symbols == DBX_DEBUG)
1459 debug_hooks = &dbx_debug_hooks;
1461 #if defined(XCOFF_DEBUGGING_INFO)
1462 else if (write_symbols == XCOFF_DEBUG)
1463 debug_hooks = &xcoff_debug_hooks;
1465 #ifdef SDB_DEBUGGING_INFO
1466 else if (write_symbols == SDB_DEBUG)
1467 debug_hooks = &sdb_debug_hooks;
1469 #ifdef DWARF2_DEBUGGING_INFO
1470 else if (write_symbols == DWARF2_DEBUG)
1471 debug_hooks = &dwarf2_debug_hooks;
1473 #ifdef VMS_DEBUGGING_INFO
1474 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1475 debug_hooks = &vmsdbg_debug_hooks;
1478 error ("target system does not support the %qs debug format",
1479 debug_type_names[write_symbols]);
1481 /* We know which debug output will be used so we can set flag_var_tracking
1482 and flag_var_tracking_uninit if the user has not specified them. */
1483 if (debug_info_level < DINFO_LEVEL_NORMAL
1484 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
1486 if (flag_var_tracking == 1
1487 || flag_var_tracking_uninit == 1)
1489 if (debug_info_level < DINFO_LEVEL_NORMAL)
1490 warning (0, "variable tracking requested, but useless unless "
1491 "producing debug info");
1493 warning (0, "variable tracking requested, but not supported "
1494 "by this debug format");
1496 flag_var_tracking = 0;
1497 flag_var_tracking_uninit = 0;
1500 /* The debug hooks are used to implement -fdump-go-spec because it
1501 gives a simple and stable API for all the information we need to
1503 if (flag_dump_go_spec != NULL)
1504 debug_hooks = dump_go_spec_init (flag_dump_go_spec, debug_hooks);
1506 /* If the user specifically requested variable tracking with tagging
1507 uninitialized variables, we need to turn on variable tracking.
1508 (We already determined above that variable tracking is feasible.) */
1509 if (flag_var_tracking_uninit == 1)
1510 flag_var_tracking = 1;
1512 if (flag_var_tracking == AUTODETECT_VALUE)
1513 flag_var_tracking = optimize >= 1;
1515 if (flag_var_tracking_uninit == AUTODETECT_VALUE)
1516 flag_var_tracking_uninit = flag_var_tracking;
1518 if (flag_var_tracking_assignments == AUTODETECT_VALUE)
1519 flag_var_tracking_assignments = flag_var_tracking
1520 && !(flag_selective_scheduling || flag_selective_scheduling2);
1522 if (flag_var_tracking_assignments_toggle)
1523 flag_var_tracking_assignments = !flag_var_tracking_assignments;
1525 if (flag_var_tracking_assignments && !flag_var_tracking)
1526 flag_var_tracking = flag_var_tracking_assignments = -1;
1528 if (flag_var_tracking_assignments
1529 && (flag_selective_scheduling || flag_selective_scheduling2))
1530 warning (0, "var-tracking-assignments changes selective scheduling");
1532 if (flag_tree_cselim == AUTODETECT_VALUE)
1533 #ifdef HAVE_conditional_move
1534 flag_tree_cselim = 1;
1536 flag_tree_cselim = 0;
1539 /* If auxiliary info generation is desired, open the output file.
1540 This goes in the same directory as the source file--unlike
1541 all the other output files. */
1542 if (flag_gen_aux_info)
1544 aux_info_file = fopen (aux_info_file_name, "w");
1545 if (aux_info_file == 0)
1546 fatal_error ("can%'t open %s: %m", aux_info_file_name);
1549 if (!targetm_common.have_named_sections)
1551 if (flag_function_sections)
1553 warning (0, "-ffunction-sections not supported for this target");
1554 flag_function_sections = 0;
1556 if (flag_data_sections)
1558 warning (0, "-fdata-sections not supported for this target");
1559 flag_data_sections = 0;
1563 #ifndef HAVE_prefetch
1564 if (flag_prefetch_loop_arrays > 0)
1566 warning (0, "-fprefetch-loop-arrays not supported for this target");
1567 flag_prefetch_loop_arrays = 0;
1570 if (flag_prefetch_loop_arrays > 0 && !HAVE_prefetch)
1572 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1573 flag_prefetch_loop_arrays = 0;
1577 /* This combination of options isn't handled for i386 targets and doesn't
1578 make much sense anyway, so don't allow it. */
1579 if (flag_prefetch_loop_arrays > 0 && optimize_size)
1581 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1582 flag_prefetch_loop_arrays = 0;
1585 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1586 if (flag_signaling_nans)
1587 flag_trapping_math = 1;
1589 /* We cannot reassociate if we want traps or signed zeros. */
1590 if (flag_associative_math && (flag_trapping_math || flag_signed_zeros))
1592 warning (0, "-fassociative-math disabled; other options take precedence");
1593 flag_associative_math = 0;
1596 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1597 if (flag_cx_limited_range)
1598 flag_complex_method = 0;
1600 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1601 if (flag_cx_fortran_rules)
1602 flag_complex_method = 1;
1604 /* Targets must be able to place spill slots at lower addresses. If the
1605 target already uses a soft frame pointer, the transition is trivial. */
1606 if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
1608 warning (0, "-fstack-protector not supported for this target");
1609 flag_stack_protect = 0;
1611 if (!flag_stack_protect)
1612 warn_stack_protect = 0;
1614 /* Address Sanitizer needs porting to each target architecture. */
1616 if ((flag_sanitize & SANITIZE_ADDRESS)
1617 && !FRAME_GROWS_DOWNWARD)
1620 "-fsanitize=address and -fsanitize=kernel-address "
1621 "are not supported for this target");
1622 flag_sanitize &= ~SANITIZE_ADDRESS;
1625 if ((flag_sanitize & SANITIZE_USER_ADDRESS)
1626 && targetm.asan_shadow_offset == NULL)
1628 warning (0, "-fsanitize=address not supported for this target");
1629 flag_sanitize &= ~SANITIZE_ADDRESS;
1632 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1633 have not been set. */
1634 if (!global_options_set.x_warnings_are_errors
1635 && warn_coverage_mismatch
1636 && (global_dc->classify_diagnostic[OPT_Wcoverage_mismatch] ==
1638 diagnostic_classify_diagnostic (global_dc, OPT_Wcoverage_mismatch,
1639 DK_ERROR, UNKNOWN_LOCATION);
1641 /* Save the current optimization options. */
1642 optimization_default_node = build_optimization_node (&global_options);
1643 optimization_current_node = optimization_default_node;
1645 /* Disable use caller save optimization if profiler is active or port
1646 does not emit prologue and epilogue as RTL. */
1647 if (profile_flag || !HAVE_prologue || !HAVE_epilogue)
1651 /* This function can be called multiple times to reinitialize the compiler
1652 back end when register classes or instruction sets have changed,
1653 before each function. */
1655 backend_init_target (void)
1657 /* Initialize alignment variables. */
1660 /* This depends on stack_pointer_rtx. */
1661 init_fake_stack_mems ();
1663 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1665 init_alias_target ();
1667 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1670 /* Depends on the enabled attribute. */
1673 /* The following initialization functions need to generate rtl, so
1674 provide a dummy function context for them. */
1675 init_dummy_function_start ();
1677 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1678 on a mode change. */
1680 init_lower_subreg ();
1683 init_expr_target ();
1686 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1687 after a mode change as well. */
1688 caller_save_initialized_p = false;
1690 expand_dummy_function_end ();
1693 /* Initialize the compiler back end. This function is called only once,
1694 when starting the compiler. */
1701 init_inline_once ();
1702 init_varasm_once ();
1703 save_register_info ();
1705 /* Middle end needs this initialization for default mem attributes
1706 used by early calls to make_decl_rtl. */
1709 /* Middle end needs this initialization for mode tables used to assign
1710 modes to vector variables. */
1714 /* Initialize excess precision settings. */
1716 init_excess_precision (void)
1718 /* Adjust excess precision handling based on the target options. If
1719 the front end cannot handle it, flag_excess_precision_cmdline
1720 will already have been set accordingly in the post_options
1722 gcc_assert (flag_excess_precision_cmdline != EXCESS_PRECISION_DEFAULT);
1723 flag_excess_precision = flag_excess_precision_cmdline;
1724 if (flag_unsafe_math_optimizations)
1725 flag_excess_precision = EXCESS_PRECISION_FAST;
1726 if (flag_excess_precision == EXCESS_PRECISION_STANDARD)
1728 int flt_eval_method = TARGET_FLT_EVAL_METHOD;
1729 switch (flt_eval_method)
1733 /* Either the target acts unpredictably (-1) or has all the
1734 operations required not to have excess precision (0). */
1735 flag_excess_precision = EXCESS_PRECISION_FAST;
1739 /* In these cases, predictable excess precision makes
1743 /* Any other implementation-defined FLT_EVAL_METHOD values
1744 require the compiler to handle the associated excess
1745 precision rules in excess_precision_type. */
1751 /* Initialize things that are both lang-dependent and target-dependent.
1752 This function can be called more than once if target parameters change. */
1754 lang_dependent_init_target (void)
1756 /* This determines excess precision settings. */
1757 init_excess_precision ();
1759 /* This creates various _DECL nodes, so needs to be called after the
1760 front end is initialized. It also depends on the HAVE_xxx macros
1761 generated from the target machine description. */
1764 gcc_assert (!this_target_rtl->target_specific_initialized);
1767 /* Perform initializations that are lang-dependent or target-dependent.
1768 but matters only for late optimizations and RTL generation. */
1770 static int rtl_initialized;
1773 initialize_rtl (void)
1775 /* Initialization done just once per compilation, but delayed
1776 till code generation. */
1777 if (!rtl_initialized)
1779 rtl_initialized = true;
1781 /* Target specific RTL backend initialization. */
1782 if (!this_target_rtl->target_specific_initialized)
1784 backend_init_target ();
1785 this_target_rtl->target_specific_initialized = true;
1789 /* Language-dependent initialization. Returns nonzero on success. */
1791 lang_dependent_init (const char *name)
1793 location_t save_loc = input_location;
1794 if (dump_base_name == 0)
1795 dump_base_name = name && name[0] ? name : "gccdump";
1797 /* Other front-end initialization. */
1798 input_location = BUILTINS_LOCATION;
1799 if (lang_hooks.init () == 0)
1801 input_location = save_loc;
1805 init_asm_output (name);
1807 /* If stack usage information is desired, open the output file. */
1808 if (flag_stack_usage)
1809 stack_usage_file = open_auxiliary_file ("su");
1812 /* This creates various _DECL nodes, so needs to be called after the
1813 front end is initialized. */
1816 /* Do the target-specific parts of the initialization. */
1817 lang_dependent_init_target ();
1821 /* If dbx symbol table desired, initialize writing it and output the
1822 predefined types. */
1823 timevar_push (TV_SYMOUT);
1825 /* Now we have the correct original filename, we can initialize
1827 (*debug_hooks->init) (name);
1829 timevar_pop (TV_SYMOUT);
1836 /* Reinitialize everything when target parameters, such as register usage,
1839 target_reinit (void)
1841 struct rtl_data saved_x_rtl;
1842 rtx *saved_regno_reg_rtx;
1843 tree saved_optimization_current_node;
1844 struct target_optabs *saved_this_fn_optabs;
1846 /* Temporarily switch to the default optimization node, so that
1847 *this_target_optabs is set to the default, not reflecting
1848 whatever a previous function used for the optimize
1850 saved_optimization_current_node = optimization_current_node;
1851 saved_this_fn_optabs = this_fn_optabs;
1852 if (saved_optimization_current_node != optimization_default_node)
1854 optimization_current_node = optimization_default_node;
1855 cl_optimization_restore
1857 TREE_OPTIMIZATION (optimization_default_node));
1859 this_fn_optabs = this_target_optabs;
1861 /* Save *crtl and regno_reg_rtx around the reinitialization
1862 to allow target_reinit being called even after prepare_function_start. */
1863 saved_regno_reg_rtx = regno_reg_rtx;
1864 if (saved_regno_reg_rtx)
1866 saved_x_rtl = *crtl;
1867 memset (crtl, '\0', sizeof (*crtl));
1868 regno_reg_rtx = NULL;
1871 this_target_rtl->target_specific_initialized = false;
1873 /* This initializes hard_frame_pointer, and calls init_reg_modes_target()
1874 to initialize reg_raw_mode[]. */
1877 /* This invokes target hooks to set fixed_reg[] etc, which is
1881 /* Reinitialize lang-dependent parts. */
1882 lang_dependent_init_target ();
1884 /* Restore the original optimization node. */
1885 if (saved_optimization_current_node != optimization_default_node)
1887 optimization_current_node = saved_optimization_current_node;
1888 cl_optimization_restore (&global_options,
1889 TREE_OPTIMIZATION (optimization_current_node));
1891 this_fn_optabs = saved_this_fn_optabs;
1893 /* Restore regno_reg_rtx at the end, as free_after_compilation from
1894 expand_dummy_function_end clears it. */
1895 if (saved_regno_reg_rtx)
1897 *crtl = saved_x_rtl;
1898 regno_reg_rtx = saved_regno_reg_rtx;
1899 saved_regno_reg_rtx = NULL;
1904 dump_memory_report (bool final)
1906 dump_line_table_statistics ();
1907 ggc_print_statistics ();
1908 stringpool_statistics ();
1909 dump_tree_statistics ();
1910 dump_gimple_statistics ();
1911 dump_rtx_statistics ();
1912 dump_alloc_pool_statistics ();
1913 dump_bitmap_statistics ();
1914 dump_vec_loc_statistics ();
1915 dump_ggc_loc_statistics (final);
1916 dump_alias_stats (stderr);
1917 dump_pta_stats (stderr);
1920 /* Clean up: close opened files, etc. */
1923 finalize (bool no_backend)
1925 /* Close the dump files. */
1926 if (flag_gen_aux_info)
1928 fclose (aux_info_file);
1930 unlink (aux_info_file_name);
1933 /* Close non-debugging input and output files. Take special care to note
1934 whether fclose returns an error, since the pages might still be on the
1935 buffer chain while the file is open. */
1939 if (ferror (asm_out_file) != 0)
1940 fatal_error ("error writing to %s: %m", asm_file_name);
1941 if (fclose (asm_out_file) != 0)
1942 fatal_error ("error closing %s: %m", asm_file_name);
1945 if (stack_usage_file)
1946 fclose (stack_usage_file);
1952 g->get_passes ()->finish_optimization_passes ();
1958 dump_memory_report (true);
1961 dump_profile_report ();
1963 /* Language-specific end of compilation actions. */
1964 lang_hooks.finish ();
1968 standard_type_bitsize (int bitsize)
1970 /* As a special exception, we always want __int128 enabled if possible. */
1973 if (bitsize == CHAR_TYPE_SIZE
1974 || bitsize == SHORT_TYPE_SIZE
1975 || bitsize == INT_TYPE_SIZE
1976 || bitsize == LONG_TYPE_SIZE
1977 || bitsize == LONG_LONG_TYPE_SIZE)
1982 /* Initialize the compiler, and compile the input file. */
1988 /* Don't do any more if an error has already occurred. */
1993 timevar_start (TV_PHASE_SETUP);
1995 /* This must be run always, because it is needed to compute the FP
1996 predefined macros, such as __LDBL_MAX__, for targets using non
1997 default FP formats. */
1998 init_adjust_machine_modes ();
1999 init_derived_machine_modes ();
2001 /* This must happen after the backend has a chance to process
2002 command line options, but before the parsers are
2004 for (i = 0; i < NUM_INT_N_ENTS; i ++)
2005 if (targetm.scalar_mode_supported_p (int_n_data[i].m)
2006 && ! standard_type_bitsize (int_n_data[i].bitsize))
2007 int_n_enabled_p[i] = true;
2009 int_n_enabled_p[i] = false;
2011 /* Set up the back-end if requested. */
2015 /* Language-dependent initialization. Returns true on success. */
2016 if (lang_dependent_init (main_input_filename))
2018 /* Initialize yet another pass. */
2020 ggc_protect_identifiers = true;
2022 symtab->initialize ();
2023 init_final (main_input_filename);
2024 coverage_init (aux_base_name);
2026 invoke_plugin_callbacks (PLUGIN_START_UNIT, NULL);
2028 timevar_stop (TV_PHASE_SETUP);
2034 timevar_stop (TV_PHASE_SETUP);
2037 timevar_start (TV_PHASE_FINALIZE);
2039 finalize (no_backend);
2041 timevar_stop (TV_PHASE_FINALIZE);
2045 toplev::toplev (bool use_TV_TOTAL)
2046 : m_use_TV_TOTAL (use_TV_TOTAL)
2048 if (!m_use_TV_TOTAL)
2054 timevar_stop (TV_TOTAL);
2055 timevar_print (stderr);
2059 toplev::start_timevars ()
2061 if (time_report || !quiet_flag || flag_detailed_statistics)
2064 timevar_start (TV_TOTAL);
2067 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2068 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2069 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2071 It is not safe to call this function more than once. */
2074 toplev::main (int argc, char **argv)
2076 /* Parsing and gimplification sometimes need quite large stack.
2077 Increase stack size limits if possible. */
2078 stack_limit_increase (64 * 1024 * 1024);
2080 expandargv (&argc, &argv);
2082 /* Initialization of GCC's environment, and diagnostics. */
2083 general_init (argv[0]);
2085 /* One-off initialization of options that does not need to be
2086 repeated when options are added for particular functions. */
2087 init_options_once ();
2089 /* Initialize global options structures; this must be repeated for
2090 each structure used for parsing options. */
2091 init_options_struct (&global_options, &global_options_set);
2092 lang_hooks.init_options_struct (&global_options);
2094 /* Convert the options to an array. */
2095 decode_cmdline_options_to_array_default_mask (argc,
2096 CONST_CAST2 (const char **,
2098 &save_decoded_options,
2099 &save_decoded_options_count);
2101 /* Perform language-specific options initialization. */
2102 lang_hooks.init_options (save_decoded_options_count, save_decoded_options);
2104 /* Parse the options and do minimal processing; basically just
2105 enough to default flags appropriately. */
2106 decode_options (&global_options, &global_options_set,
2107 save_decoded_options, save_decoded_options_count,
2108 UNKNOWN_LOCATION, global_dc);
2110 handle_common_deferred_options ();
2114 initialize_plugins ();
2117 print_version (stderr, "");
2120 print_plugins_help (stderr, "");
2122 /* Exit early if we can (e.g. -help). */
2123 if (!exit_after_options)
2130 if (warningcount || errorcount || werrorcount)
2131 print_ignored_options ();
2133 /* Invoke registered plugin callbacks if any. Some plugins could
2134 emit some diagnostics here. */
2135 invoke_plugin_callbacks (PLUGIN_FINISH, NULL);
2137 diagnostic_finish (global_dc);
2139 finalize_plugins ();
2140 location_adhoc_data_fini (line_table);
2141 if (seen_error () || werrorcount)
2142 return (FATAL_EXIT_CODE);
2144 return (SUCCESS_EXIT_CODE);
2147 /* For those that want to, this function aims to clean up enough state that
2148 you can call toplev::main again. */
2150 toplev::finalize (void)
2152 rtl_initialized = false;
2153 this_target_rtl->target_specific_initialized = false;
2155 /* Needs to be called before cgraph_c_finalize since it uses symtab. */
2156 ipa_reference_c_finalize ();
2158 cgraph_c_finalize ();
2159 cgraphunit_c_finalize ();
2160 dwarf2out_c_finalize ();
2162 ipa_cp_c_finalize ();
2163 ira_costs_c_finalize ();
2164 params_c_finalize ();
2166 finalize_options_struct (&global_options);
2167 finalize_options_struct (&global_options_set);
2169 XDELETEVEC (save_decoded_options);
2171 /* Clean up the context (and pass_manager etc). */
2175 obstack_free (&opts_obstack, NULL);