1 /* Top level of GCC compilers (cc1, cc1plus, etc.)
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
4 2011 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
29 #include "coretypes.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"
49 #include "basic-block.h"
55 #include "diagnostic.h"
56 #include "tree-diagnostic.h"
57 #include "tree-pretty-print.h"
61 #include "dwarf2asm.h"
62 #include "integrate.h"
65 #include "langhooks.h"
66 #include "cfglayout.h"
68 #include "hosthooks.h"
71 #include "opts-diagnostic.h"
73 #include "value-prof.h"
74 #include "alloc-pool.h"
75 #include "tree-mudflap.h"
76 #include "tree-pass.h"
78 #include "tree-ssa-alias.h"
81 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
82 #include "dwarf2out.h"
85 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
89 #ifdef SDB_DEBUGGING_INFO
93 #ifdef XCOFF_DEBUGGING_INFO
94 #include "xcoffout.h" /* Needed for external data
95 declarations for e.g. AIX 4.x. */
98 static void general_init (const char *);
99 static void do_compile (void);
100 static void process_options (void);
101 static void backend_init (void);
102 static int lang_dependent_init (const char *);
103 static void init_asm_output (const char *);
104 static void finalize (bool);
106 static void crash_signal (int) ATTRIBUTE_NORETURN;
107 static void compile_file (void);
109 /* True if we don't need a backend (e.g. preprocessing only). */
110 static bool no_backend;
112 /* Length of line when printing switch values. */
115 /* Decoded options, and number of such options. */
116 struct cl_decoded_option *save_decoded_options;
117 unsigned int save_decoded_options_count;
119 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
120 to optimize in process_options (). */
121 #define AUTODETECT_VALUE 2
123 /* Debug hooks - dependent upon command line options. */
125 const struct gcc_debug_hooks *debug_hooks;
127 /* True if this is the lto front end. This is used to disable
128 gimple generation and lowering passes that are normally run on the
129 output of a front end. These passes must be bypassed for lto since
130 they have already been done before the gimple was written. */
132 bool in_lto_p = false;
134 /* The FUNCTION_DECL for the function currently being compiled,
135 or 0 if between functions. */
136 tree current_function_decl;
138 /* Set to the FUNC_BEGIN label of the current function, or NULL
140 const char * current_function_func_begin_label;
142 /* A random sequence of characters, unless overridden by user. */
143 static const char *flag_random_seed;
145 /* A local time stamp derived from the time of compilation. It will be
146 zero if the system cannot provide a time. It will be -1u, if the
147 user has specified a particular random seed. */
152 /* Generate code for GNU or NeXT Objective-C runtime environment. */
154 #ifdef NEXT_OBJC_RUNTIME
155 int flag_next_runtime = 1;
157 int flag_next_runtime = 0;
160 /* Nonzero means make permerror produce warnings instead of errors. */
162 int flag_permissive = 0;
164 /* When non-NULL, indicates that whenever space is allocated on the
165 stack, the resulting stack pointer must not pass this
166 address---that is, for stacks that grow downward, the stack pointer
167 must always be greater than or equal to this address; for stacks
168 that grow upward, the stack pointer must be less than this address.
169 At present, the rtx may be either a REG or a SYMBOL_REF, although
170 the support provided depends on the backend. */
173 /* True if the user has tagged the function with the 'section'
176 bool user_defined_section_attribute = false;
178 struct target_flag_state default_target_flag_state;
179 #if SWITCHABLE_TARGET
180 struct target_flag_state *this_target_flag_state = &default_target_flag_state;
182 #define this_target_flag_state (&default_target_flag_state)
187 const char *const string;
191 lang_independent_options;
193 /* The user symbol prefix after having resolved same. */
194 const char *user_label_prefix;
196 static const param_info lang_independent_params[] = {
197 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
198 { OPTION, DEFAULT, MIN, MAX, HELP },
199 #include "params.def"
201 { NULL, 0, 0, 0, NULL }
204 /* Output files for assembler code (real compiler output)
205 and debugging dumps. */
209 FILE *stack_usage_file = NULL;
210 FILE *dump_file = NULL;
211 const char *dump_file_name;
213 /* The current working directory of a translation. It's generally the
214 directory from which compilation was initiated, but a preprocessed
215 file may specify the original directory in which it was
218 static const char *src_pwd;
220 /* Initialize src_pwd with the given string, and return true. If it
221 was already initialized, return false. As a special case, it may
222 be called with a NULL argument to test whether src_pwd has NOT been
226 set_src_pwd (const char *pwd)
230 if (strcmp (src_pwd, pwd) == 0)
236 src_pwd = xstrdup (pwd);
240 /* Return the directory from which the translation unit was initiated,
241 in case set_src_pwd() was not called before to assign it a
257 /* Called when the start of a function definition is parsed,
258 this function prints on stderr the name of the function. */
260 announce_function (tree decl)
264 if (rtl_dump_and_exit)
265 fprintf (stderr, "%s ",
266 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl))));
268 fprintf (stderr, " %s",
269 identifier_to_locale (lang_hooks.decl_printable_name (decl, 2)));
271 pp_needs_newline (global_dc->printer) = true;
272 diagnostic_set_last_function (global_dc, (diagnostic_info *) NULL);
276 /* Initialize local_tick with the time of day, or -1 if
277 flag_random_seed is set. */
280 init_local_tick (void)
282 if (!flag_random_seed)
284 /* Get some more or less random data. */
285 #ifdef HAVE_GETTIMEOFDAY
289 gettimeofday (&tv, NULL);
290 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
294 time_t now = time (NULL);
296 if (now != (time_t)-1)
297 local_tick = (unsigned) now;
305 /* Set up a default flag_random_seed and local_tick, unless the user
306 already specified one. Must be called after init_local_tick. */
309 init_random_seed (void)
311 unsigned HOST_WIDE_INT value;
312 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
314 value = local_tick ^ getpid ();
316 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
317 flag_random_seed = random_seed;
320 /* Obtain the random_seed string. Unless NOINIT, initialize it if
321 it's not provided in the command line. */
324 get_random_seed (bool noinit)
326 if (!flag_random_seed && !noinit)
328 return flag_random_seed;
331 /* Modify the random_seed string to VAL. Return its previous
335 set_random_seed (const char *val)
337 const char *old = flag_random_seed;
338 flag_random_seed = val;
342 /* Handler for fatal signals, such as SIGSEGV. These are transformed
343 into ICE messages, which is much more user friendly. In case the
344 error printer crashes, reset the signal to prevent infinite recursion. */
347 crash_signal (int signo)
349 signal (signo, SIG_DFL);
351 /* If we crashed while processing an ASM statement, then be a little more
352 graceful. It's most likely the user's fault. */
353 if (this_is_asm_operands)
355 output_operand_lossage ("unrecoverable error");
356 exit (FATAL_EXIT_CODE);
359 internal_error ("%s", strsignal (signo));
362 /* A subroutine of wrapup_global_declarations. We've come to the end of
363 the compilation unit. All deferred variables should be undeferred,
364 and all incomplete decls should be finalized. */
367 wrapup_global_declaration_1 (tree decl)
369 /* We're not deferring this any longer. Assignment is conditional to
370 avoid needlessly dirtying PCH pages. */
371 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl), TS_DECL_WITH_VIS)
372 && DECL_DEFER_OUTPUT (decl) != 0)
373 DECL_DEFER_OUTPUT (decl) = 0;
375 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
376 lang_hooks.finish_incomplete_decl (decl);
379 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
380 needs to be output. Return true if it is output. */
383 wrapup_global_declaration_2 (tree decl)
385 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (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))
415 struct varpool_node *node;
417 node = varpool_get_node (decl);
419 if (!node && flag_ltrans)
421 else if (node && node->finalized)
423 else if (node && node->alias)
425 else if (!cgraph_global_info_ready
427 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
429 else if (node && node->needed)
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;
502 assemble_external (decl);
505 /* Warn about static fns or vars defined but not used. */
506 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
507 /* We don't warn about "static const" variables because the
508 "rcs_id" idiom uses that construction. */
509 || (warn_unused_variable
510 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
511 && ! DECL_IN_SYSTEM_HEADER (decl)
512 && ! TREE_USED (decl)
513 /* The TREE_USED bit for file-scope decls is kept in the identifier,
514 to handle multiple external decls in different scopes. */
515 && ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl)))
516 && ! DECL_EXTERNAL (decl)
517 && ! TREE_PUBLIC (decl)
518 /* A volatile variable might be used in some non-obvious way. */
519 && ! TREE_THIS_VOLATILE (decl)
520 /* Global register variables must be declared to reserve them. */
521 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
522 /* Otherwise, ask the language. */
523 && lang_hooks.decls.warn_unused_global (decl))
524 warning ((TREE_CODE (decl) == FUNCTION_DECL)
525 ? OPT_Wunused_function
526 : OPT_Wunused_variable,
527 "%q+D defined but not used", decl);
530 /* Issue appropriate warnings for the global declarations in VEC (of
531 which there are LEN). */
534 check_global_declarations (tree *vec, int len)
538 for (i = 0; i < len; i++)
539 check_global_declaration_1 (vec[i]);
542 /* Emit debugging information for all global declarations in VEC. */
545 emit_debug_global_declarations (tree *vec, int len)
549 /* Avoid confusing the debug information machinery when there are errors. */
553 timevar_push (TV_SYMOUT);
554 for (i = 0; i < len; i++)
555 debug_hooks->global_decl (vec[i]);
556 timevar_pop (TV_SYMOUT);
559 /* Compile an entire translation unit. Write a file of assembly
560 output and various debugging dumps. */
565 timevar_start (TV_PHASE_PARSING);
566 timevar_push (TV_PARSE_GLOBAL);
568 /* Call the parser, which parses the entire file (calling
569 rest_of_compilation for each function). */
570 lang_hooks.parse_file ();
572 timevar_pop (TV_PARSE_GLOBAL);
573 timevar_stop (TV_PHASE_PARSING);
575 /* Compilation is now finished except for writing
576 what's left of the symbol table output. */
578 if (flag_syntax_only || flag_wpa)
581 timevar_start (TV_PHASE_GENERATE);
583 ggc_protect_identifiers = false;
585 /* This must also call cgraph_finalize_compilation_unit. */
586 lang_hooks.decls.final_write_globals ();
590 timevar_stop (TV_PHASE_GENERATE);
594 varpool_assemble_pending_decls ();
597 /* Likewise for mudflap static object registrations. */
599 mudflap_finish_file ();
601 output_shared_constant_pool ();
602 output_object_blocks ();
604 /* Write out any pending weak symbol declarations. */
607 /* This must be at the end before unwind and debug info.
608 Some target ports emit PIC setup thunks here. */
609 targetm.asm_out.code_end ();
611 /* Do dbx symbols. */
612 timevar_push (TV_SYMOUT);
614 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
615 if (dwarf2out_do_frame ())
616 dwarf2out_frame_finish ();
619 (*debug_hooks->finish) (main_input_filename);
620 timevar_pop (TV_SYMOUT);
622 /* Output some stuff at end of file if nec. */
624 dw2_output_indirect_constants ();
626 /* Flush any pending external directives. */
627 process_pending_assemble_externals ();
629 /* Emit LTO marker if LTO info has been previously emitted. This is
630 used by collect2 to determine whether an object file contains IL.
631 We used to emit an undefined reference here, but this produces
632 link errors if an object file with IL is stored into a shared
633 library without invoking lto1. */
634 if (flag_generate_lto)
636 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
637 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
639 (unsigned HOST_WIDE_INT) 1, 8);
640 #elif defined ASM_OUTPUT_ALIGNED_COMMON
641 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_v1",
642 (unsigned HOST_WIDE_INT) 1, 8);
644 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_v1",
645 (unsigned HOST_WIDE_INT) 1,
646 (unsigned HOST_WIDE_INT) 1);
650 /* Attach a special .ident directive to the end of the file to identify
651 the version of GCC which compiled this code. The format of the .ident
652 string is patterned after the ones produced by native SVR4 compilers. */
656 const char *pkg_version = "(GNU) ";
658 if (strcmp ("(GCC) ", pkgversion_string))
659 pkg_version = pkgversion_string;
660 fprintf (asm_out_file, "%s\"GCC: %s%s\"\n",
661 IDENT_ASM_OP, pkg_version, version_string);
665 /* Invoke registered plugin callbacks. */
666 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT, NULL);
668 /* This must be at the end. Some target ports emit end of file directives
669 into the assembly file here, and hence we can not output anything to the
670 assembly file after this point. */
671 targetm.asm_out.file_end ();
673 timevar_stop (TV_PHASE_GENERATE);
676 /* Indexed by enum debug_info_type. */
677 const char *const debug_type_names[] =
679 "none", "stabs", "coff", "dwarf-2", "xcoff", "vms"
682 /* Print version information to FILE.
683 Each line begins with INDENT (for the case where FILE is the
684 assembler output file). */
687 print_version (FILE *file, const char *indent)
689 static const char fmt1[] =
691 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
693 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
696 static const char fmt2[] =
697 N_("GMP version %s, MPFR version %s, MPC version %s\n");
698 static const char fmt3[] =
699 N_("%s%swarning: %s header version %s differs from library version %s.\n");
700 static const char fmt4[] =
701 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
703 #define __VERSION__ "[?]"
706 file == stderr ? _(fmt1) : fmt1,
707 indent, *indent != 0 ? " " : "",
708 lang_hooks.name, pkgversion_string, version_string, TARGET_NAME,
709 indent, __VERSION__);
711 /* We need to stringify the GMP macro values. Ugh, gmp_version has
712 two string formats, "i.j.k" and "i.j" when k is zero. As of
713 gmp-4.3.0, GMP always uses the 3 number format. */
714 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
715 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3(X)
716 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
717 #define GCC_GMP_VERSION \
718 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
719 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
720 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
721 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR)
723 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
724 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) "." \
725 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_PATCHLEVEL)
728 file == stderr ? _(fmt2) : fmt2,
729 GCC_GMP_STRINGIFY_VERSION, MPFR_VERSION_STRING, MPC_VERSION_STRING);
730 if (strcmp (GCC_GMP_STRINGIFY_VERSION, gmp_version))
732 file == stderr ? _(fmt3) : fmt3,
733 indent, *indent != 0 ? " " : "",
734 "GMP", GCC_GMP_STRINGIFY_VERSION, gmp_version);
735 if (strcmp (MPFR_VERSION_STRING, mpfr_get_version ()))
737 file == stderr ? _(fmt3) : fmt3,
738 indent, *indent != 0 ? " " : "",
739 "MPFR", MPFR_VERSION_STRING, mpfr_get_version ());
740 if (strcmp (MPC_VERSION_STRING, mpc_get_version ()))
742 file == stderr ? _(fmt3) : fmt3,
743 indent, *indent != 0 ? " " : "",
744 "MPC", MPC_VERSION_STRING, mpc_get_version ());
746 file == stderr ? _(fmt4) : fmt4,
747 indent, *indent != 0 ? " " : "",
748 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
750 print_plugins_versions (file, indent);
753 #ifdef ASM_COMMENT_START
755 print_to_asm_out_file (print_switch_type type, const char * text)
757 bool prepend_sep = true;
761 case SWITCH_TYPE_LINE_END:
762 putc ('\n', asm_out_file);
765 case SWITCH_TYPE_LINE_START:
766 fputs (ASM_COMMENT_START, asm_out_file);
767 return strlen (ASM_COMMENT_START);
769 case SWITCH_TYPE_DESCRIPTIVE:
770 if (ASM_COMMENT_START[0] == 0)
773 case SWITCH_TYPE_PASSED:
774 case SWITCH_TYPE_ENABLED:
776 fputc (' ', asm_out_file);
777 fputs (text, asm_out_file);
778 /* No need to return the length here as
779 print_single_switch has already done it. */
789 print_to_stderr (print_switch_type type, const char * text)
793 case SWITCH_TYPE_LINE_END:
797 case SWITCH_TYPE_LINE_START:
800 case SWITCH_TYPE_PASSED:
801 case SWITCH_TYPE_ENABLED:
805 case SWITCH_TYPE_DESCRIPTIVE:
806 fputs (text, stderr);
807 /* No need to return the length here as
808 print_single_switch has already done it. */
816 /* Print an option value and return the adjusted position in the line.
817 ??? print_fn doesn't handle errors, eg disk full; presumably other
818 code will catch a disk full though. */
821 print_single_switch (print_switch_fn_type print_fn,
823 print_switch_type type,
826 /* The ultrix fprintf returns 0 on success, so compute the result
827 we want here since we need it for the following test. The +1
828 is for the separator character that will probably be emitted. */
829 int len = strlen (text) + 1;
832 && pos + len > MAX_LINE)
834 print_fn (SWITCH_TYPE_LINE_END, NULL);
839 pos += print_fn (SWITCH_TYPE_LINE_START, NULL);
841 print_fn (type, text);
845 /* Print active target switches using PRINT_FN.
846 POS is the current cursor position and MAX is the size of a "line".
847 Each line begins with INDENT and ends with TERM.
848 Each switch is separated from the next by SEP. */
851 print_switch_values (print_switch_fn_type print_fn)
856 /* Fill in the -frandom-seed option, if the user didn't pass it, so
857 that it can be printed below. This helps reproducibility. */
858 if (!flag_random_seed)
861 /* Print the options as passed. */
862 pos = print_single_switch (print_fn, pos,
863 SWITCH_TYPE_DESCRIPTIVE, _("options passed: "));
865 for (j = 1; j < save_decoded_options_count; j++)
867 switch (save_decoded_options[j].opt_index)
880 pos = print_single_switch (print_fn, pos, SWITCH_TYPE_PASSED,
881 save_decoded_options[j].orig_option_with_args_text);
885 print_fn (SWITCH_TYPE_LINE_END, NULL);
887 /* Print the -f and -m options that have been enabled.
888 We don't handle language specific options but printing argv
890 pos = print_single_switch (print_fn, 0,
891 SWITCH_TYPE_DESCRIPTIVE, _("options enabled: "));
893 for (j = 0; j < cl_options_count; j++)
894 if (cl_options[j].cl_report
895 && option_enabled (j, &global_options) > 0)
896 pos = print_single_switch (print_fn, pos,
897 SWITCH_TYPE_ENABLED, cl_options[j].opt_text);
899 print_fn (SWITCH_TYPE_LINE_END, NULL);
902 /* Open assembly code output file. Do this even if -fsyntax-only is
903 on, because then the driver will have provided the name of a
904 temporary file or bit bucket for us. NAME is the file specified on
905 the command line, possibly NULL. */
907 init_asm_output (const char *name)
909 if (name == NULL && asm_file_name == 0)
910 asm_out_file = stdout;
913 if (asm_file_name == 0)
915 int len = strlen (dump_base_name);
916 char *dumpname = XNEWVEC (char, len + 6);
918 memcpy (dumpname, dump_base_name, len + 1);
919 strip_off_ending (dumpname, len);
920 strcat (dumpname, ".s");
921 asm_file_name = dumpname;
923 if (!strcmp (asm_file_name, "-"))
924 asm_out_file = stdout;
926 asm_out_file = fopen (asm_file_name, "w+b");
927 if (asm_out_file == 0)
928 fatal_error ("can%'t open %s for writing: %m", asm_file_name);
931 if (!flag_syntax_only)
933 targetm.asm_out.file_start ();
935 if (flag_record_gcc_switches)
937 if (targetm.asm_out.record_gcc_switches)
939 /* Let the target know that we are about to start recording. */
940 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
942 /* Now record the switches. */
943 print_switch_values (targetm.asm_out.record_gcc_switches);
944 /* Let the target know that the recording is over. */
945 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
949 inform (input_location, "-frecord-gcc-switches is not supported by the current target");
952 #ifdef ASM_COMMENT_START
953 if (flag_verbose_asm)
955 /* Print the list of switches in effect
956 into the assembler file as comments. */
957 print_version (asm_out_file, ASM_COMMENT_START);
958 print_switch_values (print_to_asm_out_file);
959 putc ('\n', asm_out_file);
965 /* Default tree printer. Handles declarations only. */
967 default_tree_printer (pretty_printer *pp, text_info *text, const char *spec,
968 int precision, bool wide, bool set_locus, bool hash)
972 /* FUTURE: %+x should set the locus. */
973 if (precision != 0 || wide || hash)
979 t = va_arg (*text->args_ptr, tree);
980 if (TREE_CODE (t) == IDENTIFIER_NODE)
982 pp_identifier (pp, IDENTIFIER_POINTER (t));
988 t = va_arg (*text->args_ptr, tree);
989 if (DECL_DEBUG_EXPR_IS_FROM (t) && DECL_DEBUG_EXPR (t))
990 t = DECL_DEBUG_EXPR (t);
995 t = va_arg (*text->args_ptr, tree);
999 percent_K_format (text);
1006 if (set_locus && text->locus)
1007 *text->locus = DECL_SOURCE_LOCATION (t);
1011 const char *n = DECL_NAME (t)
1012 ? identifier_to_locale (lang_hooks.decl_printable_name (t, 2))
1017 dump_generic_node (pp, t, 0, TDF_DIAGNOSTIC, 0);
1022 /* A helper function; used as the reallocator function for cpp's line
1025 realloc_for_line_map (void *ptr, size_t len)
1027 return GGC_RESIZEVAR (void, ptr, len);
1030 /* A helper function: used as the allocator function for
1031 identifier_to_locale. */
1033 alloc_for_identifier_to_locale (size_t len)
1035 return ggc_alloc_atomic (len);
1038 /* Output stack usage information. */
1040 output_stack_usage (void)
1042 static bool warning_issued = false;
1043 enum stack_usage_kind_type { STATIC = 0, DYNAMIC, DYNAMIC_BOUNDED };
1044 const char *stack_usage_kind_str[] = {
1049 HOST_WIDE_INT stack_usage = current_function_static_stack_size;
1050 enum stack_usage_kind_type stack_usage_kind;
1051 expanded_location loc;
1052 const char *raw_id, *id;
1054 if (stack_usage < 0)
1056 if (!warning_issued)
1058 warning (0, "-fstack-usage not supported for this target");
1059 warning_issued = true;
1064 stack_usage_kind = STATIC;
1066 /* Add the maximum amount of space pushed onto the stack. */
1067 if (current_function_pushed_stack_size > 0)
1069 stack_usage += current_function_pushed_stack_size;
1070 stack_usage_kind = DYNAMIC_BOUNDED;
1073 /* Now on to the tricky part: dynamic stack allocation. */
1074 if (current_function_allocates_dynamic_stack_space)
1076 if (current_function_has_unbounded_dynamic_stack_size)
1077 stack_usage_kind = DYNAMIC;
1079 stack_usage_kind = DYNAMIC_BOUNDED;
1081 /* Add the size even in the unbounded case, this can't hurt. */
1082 stack_usage += current_function_dynamic_stack_size;
1085 loc = expand_location (DECL_SOURCE_LOCATION (current_function_decl));
1087 /* Strip the scope prefix if any. */
1088 raw_id = lang_hooks.decl_printable_name (current_function_decl, 2);
1089 id = strrchr (raw_id, '.');
1095 fprintf (stack_usage_file,
1096 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC"\t%s\n",
1097 lbasename (loc.file),
1102 stack_usage_kind_str[stack_usage_kind]);
1105 /* Open an auxiliary output file. */
1107 open_auxiliary_file (const char *ext)
1112 filename = concat (aux_base_name, ".", ext, NULL);
1113 file = fopen (filename, "w");
1115 fatal_error ("can%'t open %s for writing: %m", filename);
1120 /* Initialization of the front end environment, before command line
1121 options are parsed. Signal handlers, internationalization etc.
1122 ARGV0 is main's argv[0]. */
1124 general_init (const char *argv0)
1128 p = argv0 + strlen (argv0);
1129 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1133 xmalloc_set_program_name (progname);
1137 /* Unlock the stdio streams. */
1138 unlock_std_streams ();
1140 gcc_init_libintl ();
1142 identifier_to_locale_alloc = alloc_for_identifier_to_locale;
1143 identifier_to_locale_free = ggc_free;
1145 /* Initialize the diagnostics reporting machinery, so option parsing
1146 can give warnings and errors. */
1147 diagnostic_initialize (global_dc, N_OPTS);
1148 diagnostic_starter (global_dc) = default_tree_diagnostic_starter;
1149 /* Set a default printer. Language specific initializations will
1150 override it later. */
1151 pp_format_decoder (global_dc->printer) = &default_tree_printer;
1152 global_dc->show_option_requested
1153 = global_options_init.x_flag_diagnostics_show_option;
1154 global_dc->show_column
1155 = global_options_init.x_flag_show_column;
1156 global_dc->internal_error = plugins_internal_error_function;
1157 global_dc->option_enabled = option_enabled;
1158 global_dc->option_state = &global_options;
1159 global_dc->option_name = option_name;
1161 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1163 signal (SIGSEGV, crash_signal);
1166 signal (SIGILL, crash_signal);
1169 signal (SIGBUS, crash_signal);
1172 signal (SIGABRT, crash_signal);
1174 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1175 signal (SIGIOT, crash_signal);
1178 signal (SIGFPE, crash_signal);
1181 /* Other host-specific signal setup. */
1182 (*host_hooks.extra_signals)();
1184 /* Initialize the garbage-collector, string pools and tree type hash
1188 line_table = ggc_alloc_line_maps ();
1189 linemap_init (line_table);
1190 line_table->reallocator = realloc_for_line_map;
1193 /* Initialize register usage now so switches may override. */
1196 /* Register the language-independent parameters. */
1197 add_params (lang_independent_params, LAST_PARAM);
1198 targetm.target_option.default_params ();
1200 /* This must be done after add_params but before argument processing. */
1201 init_ggc_heuristics();
1202 init_optimization_passes ();
1203 statistics_early_init ();
1207 /* Return true if the current target supports -fsection-anchors. */
1210 target_supports_section_anchors_p (void)
1212 if (targetm.min_anchor_offset == 0 && targetm.max_anchor_offset == 0)
1215 if (targetm.asm_out.output_anchor == NULL)
1221 /* Default the align_* variables to 1 if they're still unset, and
1222 set up the align_*_log variables. */
1224 init_alignments (void)
1226 if (align_loops <= 0)
1228 if (align_loops_max_skip > align_loops)
1229 align_loops_max_skip = align_loops - 1;
1230 align_loops_log = floor_log2 (align_loops * 2 - 1);
1231 if (align_jumps <= 0)
1233 if (align_jumps_max_skip > align_jumps)
1234 align_jumps_max_skip = align_jumps - 1;
1235 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1236 if (align_labels <= 0)
1238 align_labels_log = floor_log2 (align_labels * 2 - 1);
1239 if (align_labels_max_skip > align_labels)
1240 align_labels_max_skip = align_labels - 1;
1241 if (align_functions <= 0)
1242 align_functions = 1;
1243 align_functions_log = floor_log2 (align_functions * 2 - 1);
1246 /* Process the options that have been parsed. */
1248 process_options (void)
1250 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1251 This can happen with incorrect pre-processed input. */
1252 debug_hooks = &do_nothing_debug_hooks;
1254 maximum_field_alignment = initial_max_fld_align * BITS_PER_UNIT;
1256 /* Allow the front end to perform consistency checks and do further
1257 initialization based on the command line options. This hook also
1258 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1259 so we can correctly initialize debug output. */
1260 no_backend = lang_hooks.post_options (&main_input_filename);
1262 /* Some machines may reject certain combinations of options. */
1263 targetm.target_option.override ();
1265 /* Avoid any informative notes in the second run of -fcompare-debug. */
1266 if (flag_compare_debug)
1267 diagnostic_inhibit_notes (global_dc);
1269 if (flag_section_anchors && !target_supports_section_anchors_p ())
1271 warning (OPT_fsection_anchors,
1272 "this target does not support %qs", "-fsection-anchors");
1273 flag_section_anchors = 0;
1276 if (flag_short_enums == 2)
1277 flag_short_enums = targetm.default_short_enums ();
1279 /* Set aux_base_name if not already set. */
1282 else if (main_input_filename)
1284 char *name = xstrdup (lbasename (main_input_filename));
1286 strip_off_ending (name, strlen (name));
1287 aux_base_name = name;
1290 aux_base_name = "gccaux";
1294 || flag_graphite_identity
1296 || flag_loop_flatten
1297 || flag_loop_interchange
1298 || flag_loop_strip_mine
1299 || flag_loop_parallelize_all)
1300 sorry ("Graphite loop optimizations cannot be used (-fgraphite, "
1301 "-fgraphite-identity, -floop-block, -floop-flatten, "
1302 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1303 "and -ftree-loop-linear)");
1306 /* Unrolling all loops implies that standard loop unrolling must also
1308 if (flag_unroll_all_loops)
1309 flag_unroll_loops = 1;
1311 /* web and rename-registers help when run after loop unrolling. */
1312 if (flag_web == AUTODETECT_VALUE)
1313 flag_web = flag_unroll_loops || flag_peel_loops;
1315 if (flag_rename_registers == AUTODETECT_VALUE)
1316 flag_rename_registers = flag_unroll_loops || flag_peel_loops;
1318 if (flag_non_call_exceptions)
1319 flag_asynchronous_unwind_tables = 1;
1320 if (flag_asynchronous_unwind_tables)
1321 flag_unwind_tables = 1;
1323 if (flag_value_profile_transformations)
1324 flag_profile_values = 1;
1326 /* Warn about options that are not supported on this machine. */
1327 #ifndef INSN_SCHEDULING
1328 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1329 warning (0, "instruction scheduling not supported on this target machine");
1332 if (flag_delayed_branch)
1333 warning (0, "this target machine does not have delayed branches");
1336 user_label_prefix = USER_LABEL_PREFIX;
1337 if (flag_leading_underscore != -1)
1339 /* If the default prefix is more complicated than "" or "_",
1340 issue a warning and ignore this option. */
1341 if (user_label_prefix[0] == 0 ||
1342 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1344 user_label_prefix = flag_leading_underscore ? "_" : "";
1347 warning (0, "-f%sleading-underscore not supported on this target machine",
1348 flag_leading_underscore ? "" : "no-");
1351 /* If we are in verbose mode, write out the version and maybe all the
1352 option flags in use. */
1355 print_version (stderr, "");
1357 print_switch_values (print_to_stderr);
1360 if (flag_syntax_only)
1362 write_symbols = NO_DEBUG;
1368 if (debug_info_level == DINFO_LEVEL_NONE)
1370 debug_info_level = DINFO_LEVEL_NORMAL;
1372 if (write_symbols == NO_DEBUG)
1373 write_symbols = PREFERRED_DEBUGGING_TYPE;
1376 debug_info_level = DINFO_LEVEL_NONE;
1379 if (flag_dump_final_insns && !flag_syntax_only && !no_backend)
1381 FILE *final_output = fopen (flag_dump_final_insns, "w");
1384 error ("could not open final insn dump file %qs: %m",
1385 flag_dump_final_insns);
1386 flag_dump_final_insns = NULL;
1388 else if (fclose (final_output))
1390 error ("could not close zeroed insn dump file %qs: %m",
1391 flag_dump_final_insns);
1392 flag_dump_final_insns = NULL;
1396 /* Unless over-ridden for the target, assume that all DWARF levels
1397 may be emitted, if DWARF2_DEBUG is selected. */
1398 if (dwarf_strict < 0)
1401 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1403 if (debug_info_level == DINFO_LEVEL_NONE)
1404 write_symbols = NO_DEBUG;
1406 if (write_symbols == NO_DEBUG)
1408 #if defined(DBX_DEBUGGING_INFO)
1409 else if (write_symbols == DBX_DEBUG)
1410 debug_hooks = &dbx_debug_hooks;
1412 #if defined(XCOFF_DEBUGGING_INFO)
1413 else if (write_symbols == XCOFF_DEBUG)
1414 debug_hooks = &xcoff_debug_hooks;
1416 #ifdef SDB_DEBUGGING_INFO
1417 else if (write_symbols == SDB_DEBUG)
1418 debug_hooks = &sdb_debug_hooks;
1420 #ifdef DWARF2_DEBUGGING_INFO
1421 else if (write_symbols == DWARF2_DEBUG)
1422 debug_hooks = &dwarf2_debug_hooks;
1424 #ifdef VMS_DEBUGGING_INFO
1425 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1426 debug_hooks = &vmsdbg_debug_hooks;
1429 error ("target system does not support the \"%s\" debug format",
1430 debug_type_names[write_symbols]);
1432 /* We know which debug output will be used so we can set flag_var_tracking
1433 and flag_var_tracking_uninit if the user has not specified them. */
1434 if (debug_info_level < DINFO_LEVEL_NORMAL
1435 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
1437 if (flag_var_tracking == 1
1438 || flag_var_tracking_uninit == 1)
1440 if (debug_info_level < DINFO_LEVEL_NORMAL)
1441 warning (0, "variable tracking requested, but useless unless "
1442 "producing debug info");
1444 warning (0, "variable tracking requested, but not supported "
1445 "by this debug format");
1447 flag_var_tracking = 0;
1448 flag_var_tracking_uninit = 0;
1451 /* The debug hooks are used to implement -fdump-go-spec because it
1452 gives a simple and stable API for all the information we need to
1454 if (flag_dump_go_spec != NULL)
1455 debug_hooks = dump_go_spec_init (flag_dump_go_spec, debug_hooks);
1457 /* If the user specifically requested variable tracking with tagging
1458 uninitialized variables, we need to turn on variable tracking.
1459 (We already determined above that variable tracking is feasible.) */
1460 if (flag_var_tracking_uninit)
1461 flag_var_tracking = 1;
1463 if (flag_var_tracking == AUTODETECT_VALUE)
1464 flag_var_tracking = optimize >= 1;
1466 if (flag_var_tracking_assignments == AUTODETECT_VALUE)
1467 flag_var_tracking_assignments = flag_var_tracking
1468 && !(flag_selective_scheduling || flag_selective_scheduling2);
1470 if (flag_var_tracking_assignments_toggle)
1471 flag_var_tracking_assignments = !flag_var_tracking_assignments;
1473 if (flag_var_tracking_assignments && !flag_var_tracking)
1474 flag_var_tracking = flag_var_tracking_assignments = -1;
1476 if (flag_var_tracking_assignments
1477 && (flag_selective_scheduling || flag_selective_scheduling2))
1478 warning (0, "var-tracking-assignments changes selective scheduling");
1480 if (flag_tree_cselim == AUTODETECT_VALUE)
1481 #ifdef HAVE_conditional_move
1482 flag_tree_cselim = 1;
1484 flag_tree_cselim = 0;
1487 /* If auxiliary info generation is desired, open the output file.
1488 This goes in the same directory as the source file--unlike
1489 all the other output files. */
1490 if (flag_gen_aux_info)
1492 aux_info_file = fopen (aux_info_file_name, "w");
1493 if (aux_info_file == 0)
1494 fatal_error ("can%'t open %s: %m", aux_info_file_name);
1497 if (! targetm.have_named_sections)
1499 if (flag_function_sections)
1501 warning (0, "-ffunction-sections not supported for this target");
1502 flag_function_sections = 0;
1504 if (flag_data_sections)
1506 warning (0, "-fdata-sections not supported for this target");
1507 flag_data_sections = 0;
1511 if (flag_function_sections && profile_flag)
1513 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
1514 flag_function_sections = 0;
1517 #ifndef HAVE_prefetch
1518 if (flag_prefetch_loop_arrays > 0)
1520 warning (0, "-fprefetch-loop-arrays not supported for this target");
1521 flag_prefetch_loop_arrays = 0;
1524 if (flag_prefetch_loop_arrays > 0 && !HAVE_prefetch)
1526 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1527 flag_prefetch_loop_arrays = 0;
1531 /* This combination of options isn't handled for i386 targets and doesn't
1532 make much sense anyway, so don't allow it. */
1533 if (flag_prefetch_loop_arrays > 0 && optimize_size)
1535 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1536 flag_prefetch_loop_arrays = 0;
1539 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1540 if (flag_signaling_nans)
1541 flag_trapping_math = 1;
1543 /* We cannot reassociate if we want traps or signed zeros. */
1544 if (flag_associative_math && (flag_trapping_math || flag_signed_zeros))
1546 warning (0, "-fassociative-math disabled; other options take precedence");
1547 flag_associative_math = 0;
1550 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1551 if (flag_cx_limited_range)
1552 flag_complex_method = 0;
1554 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1555 if (flag_cx_fortran_rules)
1556 flag_complex_method = 1;
1558 /* Targets must be able to place spill slots at lower addresses. If the
1559 target already uses a soft frame pointer, the transition is trivial. */
1560 if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
1562 warning (0, "-fstack-protector not supported for this target");
1563 flag_stack_protect = 0;
1565 if (!flag_stack_protect)
1566 warn_stack_protect = 0;
1568 /* ??? Unwind info is not correct around the CFG unless either a frame
1569 pointer is present or A_O_A is set. Fixing this requires rewriting
1570 unwind info generation to be aware of the CFG and propagating states
1572 if (flag_unwind_tables && !ACCUMULATE_OUTGOING_ARGS
1573 && flag_omit_frame_pointer)
1575 warning (0, "unwind tables currently require a frame pointer "
1577 flag_omit_frame_pointer = 0;
1580 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1581 have not been set. */
1582 if (!global_options_set.x_warnings_are_errors
1583 && warn_coverage_mismatch
1584 && (global_dc->classify_diagnostic[OPT_Wcoverage_mismatch] ==
1586 diagnostic_classify_diagnostic (global_dc, OPT_Wcoverage_mismatch,
1587 DK_ERROR, UNKNOWN_LOCATION);
1589 /* Save the current optimization options. */
1590 optimization_default_node = build_optimization_node ();
1591 optimization_current_node = optimization_default_node;
1594 /* This function can be called multiple times to reinitialize the compiler
1595 back end when register classes or instruction sets have changed,
1596 before each function. */
1598 backend_init_target (void)
1600 /* Initialize alignment variables. */
1603 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
1604 to initialize reg_raw_mode[]. */
1607 /* This invokes target hooks to set fixed_reg[] etc, which is
1611 /* This depends on stack_pointer_rtx. */
1612 init_fake_stack_mems ();
1614 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1616 init_alias_target ();
1618 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1621 /* The following initialization functions need to generate rtl, so
1622 provide a dummy function context for them. */
1623 init_dummy_function_start ();
1625 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1626 on a mode change. */
1629 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1630 after a mode change as well. */
1631 caller_save_initialized_p = false;
1633 expand_dummy_function_end ();
1636 /* Initialize the compiler back end. This function is called only once,
1637 when starting the compiler. */
1644 init_inline_once ();
1645 init_varasm_once ();
1646 save_register_info ();
1648 /* Initialize the target-specific back end pieces. */
1650 backend_init_target ();
1653 /* Initialize excess precision settings. */
1655 init_excess_precision (void)
1657 /* Adjust excess precision handling based on the target options. If
1658 the front end cannot handle it, flag_excess_precision_cmdline
1659 will already have been set accordingly in the post_options
1661 gcc_assert (flag_excess_precision_cmdline != EXCESS_PRECISION_DEFAULT);
1662 flag_excess_precision = flag_excess_precision_cmdline;
1663 if (flag_unsafe_math_optimizations)
1664 flag_excess_precision = EXCESS_PRECISION_FAST;
1665 if (flag_excess_precision == EXCESS_PRECISION_STANDARD)
1667 int flt_eval_method = TARGET_FLT_EVAL_METHOD;
1668 switch (flt_eval_method)
1672 /* Either the target acts unpredictably (-1) or has all the
1673 operations required not to have excess precision (0). */
1674 flag_excess_precision = EXCESS_PRECISION_FAST;
1678 /* In these cases, predictable excess precision makes
1682 /* Any other implementation-defined FLT_EVAL_METHOD values
1683 require the compiler to handle the associated excess
1684 precision rules in excess_precision_type. */
1690 /* Initialize things that are both lang-dependent and target-dependent.
1691 This function can be called more than once if target parameters change. */
1693 lang_dependent_init_target (void)
1695 /* This determines excess precision settings. */
1696 init_excess_precision ();
1698 /* This creates various _DECL nodes, so needs to be called after the
1699 front end is initialized. It also depends on the HAVE_xxx macros
1700 generated from the target machine description. */
1703 /* The following initialization functions need to generate rtl, so
1704 provide a dummy function context for them. */
1705 init_dummy_function_start ();
1707 /* Do the target-specific parts of expr initialization. */
1708 init_expr_target ();
1710 /* Although the actions of these functions are language-independent,
1711 they use optabs, so we cannot call them from backend_init. */
1715 expand_dummy_function_end ();
1718 /* Language-dependent initialization. Returns nonzero on success. */
1720 lang_dependent_init (const char *name)
1722 location_t save_loc = input_location;
1723 if (dump_base_name == 0)
1724 dump_base_name = name && name[0] ? name : "gccdump";
1726 /* Other front-end initialization. */
1727 input_location = BUILTINS_LOCATION;
1728 if (lang_hooks.init () == 0)
1730 input_location = save_loc;
1734 init_asm_output (name);
1736 /* If stack usage information is desired, open the output file. */
1737 if (flag_stack_usage)
1738 stack_usage_file = open_auxiliary_file ("su");
1741 /* This creates various _DECL nodes, so needs to be called after the
1742 front end is initialized. */
1745 /* Do the target-specific parts of the initialization. */
1746 lang_dependent_init_target ();
1750 /* If dbx symbol table desired, initialize writing it and output the
1751 predefined types. */
1752 timevar_push (TV_SYMOUT);
1754 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
1755 if (dwarf2out_do_frame ())
1756 dwarf2out_frame_init ();
1759 /* Now we have the correct original filename, we can initialize
1761 (*debug_hooks->init) (name);
1763 timevar_pop (TV_SYMOUT);
1770 /* Reinitialize everything when target parameters, such as register usage,
1773 target_reinit (void)
1775 struct rtl_data saved_x_rtl;
1776 rtx *saved_regno_reg_rtx;
1778 /* Save *crtl and regno_reg_rtx around the reinitialization
1779 to allow target_reinit being called even after prepare_function_start. */
1780 saved_regno_reg_rtx = regno_reg_rtx;
1781 if (saved_regno_reg_rtx)
1783 saved_x_rtl = *crtl;
1784 memset (crtl, '\0', sizeof (*crtl));
1785 regno_reg_rtx = NULL;
1788 /* Reinitialize RTL backend. */
1789 backend_init_target ();
1791 /* Reinitialize lang-dependent parts. */
1792 lang_dependent_init_target ();
1794 /* And restore it at the end, as free_after_compilation from
1795 expand_dummy_function_end clears it. */
1796 if (saved_regno_reg_rtx)
1798 *crtl = saved_x_rtl;
1799 regno_reg_rtx = saved_regno_reg_rtx;
1800 saved_regno_reg_rtx = NULL;
1805 dump_memory_report (bool final)
1807 ggc_print_statistics ();
1808 stringpool_statistics ();
1809 dump_tree_statistics ();
1810 dump_gimple_statistics ();
1811 dump_rtx_statistics ();
1812 dump_alloc_pool_statistics ();
1813 dump_bitmap_statistics ();
1814 dump_vec_loc_statistics ();
1815 dump_ggc_loc_statistics (final);
1816 dump_alias_stats (stderr);
1817 dump_pta_stats (stderr);
1820 /* Clean up: close opened files, etc. */
1823 finalize (bool no_backend)
1825 /* Close the dump files. */
1826 if (flag_gen_aux_info)
1828 fclose (aux_info_file);
1830 unlink (aux_info_file_name);
1833 /* Close non-debugging input and output files. Take special care to note
1834 whether fclose returns an error, since the pages might still be on the
1835 buffer chain while the file is open. */
1839 if (ferror (asm_out_file) != 0)
1840 fatal_error ("error writing to %s: %m", asm_file_name);
1841 if (fclose (asm_out_file) != 0)
1842 fatal_error ("error closing %s: %m", asm_file_name);
1845 if (stack_usage_file)
1846 fclose (stack_usage_file);
1852 finish_optimization_passes ();
1858 dump_memory_report (true);
1860 /* Language-specific end of compilation actions. */
1861 lang_hooks.finish ();
1864 /* Initialize the compiler, and compile the input file. */
1868 /* Initialize timing first. The C front ends read the main file in
1869 the post_options hook, and C++ does file timings. */
1870 if (time_report || !quiet_flag || flag_detailed_statistics)
1872 timevar_start (TV_TOTAL);
1876 /* Don't do any more if an error has already occurred. */
1879 timevar_start (TV_PHASE_SETUP);
1881 /* This must be run always, because it is needed to compute the FP
1882 predefined macros, such as __LDBL_MAX__, for targets using non
1883 default FP formats. */
1884 init_adjust_machine_modes ();
1886 /* Set up the back-end if requested. */
1890 /* Language-dependent initialization. Returns true on success. */
1891 if (lang_dependent_init (main_input_filename))
1893 /* Initialize yet another pass. */
1895 ggc_protect_identifiers = true;
1898 init_final (main_input_filename);
1899 coverage_init (aux_base_name);
1901 invoke_plugin_callbacks (PLUGIN_START_UNIT, NULL);
1903 timevar_stop (TV_PHASE_SETUP);
1909 timevar_stop (TV_PHASE_SETUP);
1912 timevar_start (TV_PHASE_FINALIZE);
1914 finalize (no_backend);
1916 timevar_stop (TV_PHASE_FINALIZE);
1919 /* Stop timing and print the times. */
1920 timevar_stop (TV_TOTAL);
1921 timevar_print (stderr);
1924 /* Entry point of cc1, cc1plus, jc1, f771, etc.
1925 Exit code is FATAL_EXIT_CODE if can't open files or if there were
1926 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
1928 It is not safe to call this function more than once. */
1931 toplev_main (int argc, char **argv)
1933 expandargv (&argc, &argv);
1935 /* Initialization of GCC's environment, and diagnostics. */
1936 general_init (argv[0]);
1938 /* One-off initialization of options that does not need to be
1939 repeated when options are added for particular functions. */
1940 init_options_once ();
1942 /* Initialize global options structures; this must be repeated for
1943 each structure used for parsing options. */
1944 init_options_struct (&global_options, &global_options_set);
1945 lang_hooks.init_options_struct (&global_options);
1947 /* Convert the options to an array. */
1948 decode_cmdline_options_to_array_default_mask (argc,
1949 CONST_CAST2 (const char **,
1951 &save_decoded_options,
1952 &save_decoded_options_count);
1954 /* Perform language-specific options initialization. */
1955 lang_hooks.init_options (save_decoded_options_count, save_decoded_options);
1957 /* Parse the options and do minimal processing; basically just
1958 enough to default flags appropriately. */
1959 decode_options (&global_options, &global_options_set,
1960 save_decoded_options, save_decoded_options_count,
1961 UNKNOWN_LOCATION, global_dc);
1963 handle_common_deferred_options ();
1967 initialize_plugins ();
1970 print_version (stderr, "");
1973 print_plugins_help (stderr, "");
1975 /* Exit early if we can (e.g. -help). */
1976 if (!exit_after_options)
1979 if (warningcount || errorcount)
1980 print_ignored_options ();
1981 diagnostic_finish (global_dc);
1983 /* Invoke registered plugin callbacks if any. */
1984 invoke_plugin_callbacks (PLUGIN_FINISH, NULL);
1986 finalize_plugins ();
1988 return (FATAL_EXIT_CODE);
1990 return (SUCCESS_EXIT_CODE);