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;
1052 if (stack_usage < 0)
1054 if (!warning_issued)
1056 warning (0, "stack usage computation not supported for this target");
1057 warning_issued = true;
1062 stack_usage_kind = STATIC;
1064 /* Add the maximum amount of space pushed onto the stack. */
1065 if (current_function_pushed_stack_size > 0)
1067 stack_usage += current_function_pushed_stack_size;
1068 stack_usage_kind = DYNAMIC_BOUNDED;
1071 /* Now on to the tricky part: dynamic stack allocation. */
1072 if (current_function_allocates_dynamic_stack_space)
1074 if (current_function_has_unbounded_dynamic_stack_size)
1075 stack_usage_kind = DYNAMIC;
1077 stack_usage_kind = DYNAMIC_BOUNDED;
1079 /* Add the size even in the unbounded case, this can't hurt. */
1080 stack_usage += current_function_dynamic_stack_size;
1083 if (flag_stack_usage)
1085 expanded_location loc
1086 = expand_location (DECL_SOURCE_LOCATION (current_function_decl));
1087 const char *raw_id, *id;
1089 /* Strip the scope prefix if any. */
1090 raw_id = lang_hooks.decl_printable_name (current_function_decl, 2);
1091 id = strrchr (raw_id, '.');
1097 fprintf (stack_usage_file,
1098 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC"\t%s\n",
1099 lbasename (loc.file),
1104 stack_usage_kind_str[stack_usage_kind]);
1107 if (warn_stack_usage >= 0)
1109 if (stack_usage_kind == DYNAMIC)
1110 warning (OPT_Wstack_usage_, "stack usage might be unbounded");
1111 else if (stack_usage > warn_stack_usage)
1113 if (stack_usage_kind == DYNAMIC_BOUNDED)
1114 warning (OPT_Wstack_usage_, "stack usage might be %wd bytes",
1117 warning (OPT_Wstack_usage_, "stack usage is %wd bytes",
1123 /* Open an auxiliary output file. */
1125 open_auxiliary_file (const char *ext)
1130 filename = concat (aux_base_name, ".", ext, NULL);
1131 file = fopen (filename, "w");
1133 fatal_error ("can%'t open %s for writing: %m", filename);
1138 /* Initialization of the front end environment, before command line
1139 options are parsed. Signal handlers, internationalization etc.
1140 ARGV0 is main's argv[0]. */
1142 general_init (const char *argv0)
1146 p = argv0 + strlen (argv0);
1147 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1151 xmalloc_set_program_name (progname);
1155 /* Unlock the stdio streams. */
1156 unlock_std_streams ();
1158 gcc_init_libintl ();
1160 identifier_to_locale_alloc = alloc_for_identifier_to_locale;
1161 identifier_to_locale_free = ggc_free;
1163 /* Initialize the diagnostics reporting machinery, so option parsing
1164 can give warnings and errors. */
1165 diagnostic_initialize (global_dc, N_OPTS);
1166 diagnostic_starter (global_dc) = default_tree_diagnostic_starter;
1167 /* Set a default printer. Language specific initializations will
1168 override it later. */
1169 pp_format_decoder (global_dc->printer) = &default_tree_printer;
1170 global_dc->show_option_requested
1171 = global_options_init.x_flag_diagnostics_show_option;
1172 global_dc->show_column
1173 = global_options_init.x_flag_show_column;
1174 global_dc->internal_error = plugins_internal_error_function;
1175 global_dc->option_enabled = option_enabled;
1176 global_dc->option_state = &global_options;
1177 global_dc->option_name = option_name;
1179 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1181 signal (SIGSEGV, crash_signal);
1184 signal (SIGILL, crash_signal);
1187 signal (SIGBUS, crash_signal);
1190 signal (SIGABRT, crash_signal);
1192 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1193 signal (SIGIOT, crash_signal);
1196 signal (SIGFPE, crash_signal);
1199 /* Other host-specific signal setup. */
1200 (*host_hooks.extra_signals)();
1202 /* Initialize the garbage-collector, string pools and tree type hash
1206 line_table = ggc_alloc_line_maps ();
1207 linemap_init (line_table);
1208 line_table->reallocator = realloc_for_line_map;
1211 /* Initialize register usage now so switches may override. */
1214 /* Register the language-independent parameters. */
1215 add_params (lang_independent_params, LAST_PARAM);
1216 targetm.target_option.default_params ();
1218 /* This must be done after add_params but before argument processing. */
1219 init_ggc_heuristics();
1220 init_optimization_passes ();
1221 statistics_early_init ();
1225 /* Return true if the current target supports -fsection-anchors. */
1228 target_supports_section_anchors_p (void)
1230 if (targetm.min_anchor_offset == 0 && targetm.max_anchor_offset == 0)
1233 if (targetm.asm_out.output_anchor == NULL)
1239 /* Default the align_* variables to 1 if they're still unset, and
1240 set up the align_*_log variables. */
1242 init_alignments (void)
1244 if (align_loops <= 0)
1246 if (align_loops_max_skip > align_loops)
1247 align_loops_max_skip = align_loops - 1;
1248 align_loops_log = floor_log2 (align_loops * 2 - 1);
1249 if (align_jumps <= 0)
1251 if (align_jumps_max_skip > align_jumps)
1252 align_jumps_max_skip = align_jumps - 1;
1253 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1254 if (align_labels <= 0)
1256 align_labels_log = floor_log2 (align_labels * 2 - 1);
1257 if (align_labels_max_skip > align_labels)
1258 align_labels_max_skip = align_labels - 1;
1259 if (align_functions <= 0)
1260 align_functions = 1;
1261 align_functions_log = floor_log2 (align_functions * 2 - 1);
1264 /* Process the options that have been parsed. */
1266 process_options (void)
1268 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1269 This can happen with incorrect pre-processed input. */
1270 debug_hooks = &do_nothing_debug_hooks;
1272 maximum_field_alignment = initial_max_fld_align * BITS_PER_UNIT;
1274 /* Allow the front end to perform consistency checks and do further
1275 initialization based on the command line options. This hook also
1276 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1277 so we can correctly initialize debug output. */
1278 no_backend = lang_hooks.post_options (&main_input_filename);
1280 /* Some machines may reject certain combinations of options. */
1281 targetm.target_option.override ();
1283 /* Avoid any informative notes in the second run of -fcompare-debug. */
1284 if (flag_compare_debug)
1285 diagnostic_inhibit_notes (global_dc);
1287 if (flag_section_anchors && !target_supports_section_anchors_p ())
1289 warning (OPT_fsection_anchors,
1290 "this target does not support %qs", "-fsection-anchors");
1291 flag_section_anchors = 0;
1294 if (flag_short_enums == 2)
1295 flag_short_enums = targetm.default_short_enums ();
1297 /* Set aux_base_name if not already set. */
1300 else if (main_input_filename)
1302 char *name = xstrdup (lbasename (main_input_filename));
1304 strip_off_ending (name, strlen (name));
1305 aux_base_name = name;
1308 aux_base_name = "gccaux";
1312 || flag_graphite_identity
1314 || flag_loop_flatten
1315 || flag_loop_interchange
1316 || flag_loop_strip_mine
1317 || flag_loop_parallelize_all)
1318 sorry ("Graphite loop optimizations cannot be used (-fgraphite, "
1319 "-fgraphite-identity, -floop-block, -floop-flatten, "
1320 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1321 "and -ftree-loop-linear)");
1324 /* Unrolling all loops implies that standard loop unrolling must also
1326 if (flag_unroll_all_loops)
1327 flag_unroll_loops = 1;
1329 /* web and rename-registers help when run after loop unrolling. */
1330 if (flag_web == AUTODETECT_VALUE)
1331 flag_web = flag_unroll_loops || flag_peel_loops;
1333 if (flag_rename_registers == AUTODETECT_VALUE)
1334 flag_rename_registers = flag_unroll_loops || flag_peel_loops;
1336 if (flag_non_call_exceptions)
1337 flag_asynchronous_unwind_tables = 1;
1338 if (flag_asynchronous_unwind_tables)
1339 flag_unwind_tables = 1;
1341 if (flag_value_profile_transformations)
1342 flag_profile_values = 1;
1344 /* Warn about options that are not supported on this machine. */
1345 #ifndef INSN_SCHEDULING
1346 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1347 warning (0, "instruction scheduling not supported on this target machine");
1350 if (flag_delayed_branch)
1351 warning (0, "this target machine does not have delayed branches");
1354 user_label_prefix = USER_LABEL_PREFIX;
1355 if (flag_leading_underscore != -1)
1357 /* If the default prefix is more complicated than "" or "_",
1358 issue a warning and ignore this option. */
1359 if (user_label_prefix[0] == 0 ||
1360 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1362 user_label_prefix = flag_leading_underscore ? "_" : "";
1365 warning (0, "-f%sleading-underscore not supported on this target machine",
1366 flag_leading_underscore ? "" : "no-");
1369 /* If we are in verbose mode, write out the version and maybe all the
1370 option flags in use. */
1373 print_version (stderr, "");
1375 print_switch_values (print_to_stderr);
1378 if (flag_syntax_only)
1380 write_symbols = NO_DEBUG;
1386 if (debug_info_level == DINFO_LEVEL_NONE)
1388 debug_info_level = DINFO_LEVEL_NORMAL;
1390 if (write_symbols == NO_DEBUG)
1391 write_symbols = PREFERRED_DEBUGGING_TYPE;
1394 debug_info_level = DINFO_LEVEL_NONE;
1397 if (flag_dump_final_insns && !flag_syntax_only && !no_backend)
1399 FILE *final_output = fopen (flag_dump_final_insns, "w");
1402 error ("could not open final insn dump file %qs: %m",
1403 flag_dump_final_insns);
1404 flag_dump_final_insns = NULL;
1406 else if (fclose (final_output))
1408 error ("could not close zeroed insn dump file %qs: %m",
1409 flag_dump_final_insns);
1410 flag_dump_final_insns = NULL;
1414 /* Unless over-ridden for the target, assume that all DWARF levels
1415 may be emitted, if DWARF2_DEBUG is selected. */
1416 if (dwarf_strict < 0)
1419 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1421 if (debug_info_level == DINFO_LEVEL_NONE)
1422 write_symbols = NO_DEBUG;
1424 if (write_symbols == NO_DEBUG)
1426 #if defined(DBX_DEBUGGING_INFO)
1427 else if (write_symbols == DBX_DEBUG)
1428 debug_hooks = &dbx_debug_hooks;
1430 #if defined(XCOFF_DEBUGGING_INFO)
1431 else if (write_symbols == XCOFF_DEBUG)
1432 debug_hooks = &xcoff_debug_hooks;
1434 #ifdef SDB_DEBUGGING_INFO
1435 else if (write_symbols == SDB_DEBUG)
1436 debug_hooks = &sdb_debug_hooks;
1438 #ifdef DWARF2_DEBUGGING_INFO
1439 else if (write_symbols == DWARF2_DEBUG)
1440 debug_hooks = &dwarf2_debug_hooks;
1442 #ifdef VMS_DEBUGGING_INFO
1443 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1444 debug_hooks = &vmsdbg_debug_hooks;
1447 error ("target system does not support the \"%s\" debug format",
1448 debug_type_names[write_symbols]);
1450 /* We know which debug output will be used so we can set flag_var_tracking
1451 and flag_var_tracking_uninit if the user has not specified them. */
1452 if (debug_info_level < DINFO_LEVEL_NORMAL
1453 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
1455 if (flag_var_tracking == 1
1456 || flag_var_tracking_uninit == 1)
1458 if (debug_info_level < DINFO_LEVEL_NORMAL)
1459 warning (0, "variable tracking requested, but useless unless "
1460 "producing debug info");
1462 warning (0, "variable tracking requested, but not supported "
1463 "by this debug format");
1465 flag_var_tracking = 0;
1466 flag_var_tracking_uninit = 0;
1469 /* The debug hooks are used to implement -fdump-go-spec because it
1470 gives a simple and stable API for all the information we need to
1472 if (flag_dump_go_spec != NULL)
1473 debug_hooks = dump_go_spec_init (flag_dump_go_spec, debug_hooks);
1475 /* If the user specifically requested variable tracking with tagging
1476 uninitialized variables, we need to turn on variable tracking.
1477 (We already determined above that variable tracking is feasible.) */
1478 if (flag_var_tracking_uninit)
1479 flag_var_tracking = 1;
1481 if (flag_var_tracking == AUTODETECT_VALUE)
1482 flag_var_tracking = optimize >= 1;
1484 if (flag_var_tracking_assignments == AUTODETECT_VALUE)
1485 flag_var_tracking_assignments = flag_var_tracking
1486 && !(flag_selective_scheduling || flag_selective_scheduling2);
1488 if (flag_var_tracking_assignments_toggle)
1489 flag_var_tracking_assignments = !flag_var_tracking_assignments;
1491 if (flag_var_tracking_assignments && !flag_var_tracking)
1492 flag_var_tracking = flag_var_tracking_assignments = -1;
1494 if (flag_var_tracking_assignments
1495 && (flag_selective_scheduling || flag_selective_scheduling2))
1496 warning (0, "var-tracking-assignments changes selective scheduling");
1498 if (flag_tree_cselim == AUTODETECT_VALUE)
1499 #ifdef HAVE_conditional_move
1500 flag_tree_cselim = 1;
1502 flag_tree_cselim = 0;
1505 /* If auxiliary info generation is desired, open the output file.
1506 This goes in the same directory as the source file--unlike
1507 all the other output files. */
1508 if (flag_gen_aux_info)
1510 aux_info_file = fopen (aux_info_file_name, "w");
1511 if (aux_info_file == 0)
1512 fatal_error ("can%'t open %s: %m", aux_info_file_name);
1515 if (! targetm.have_named_sections)
1517 if (flag_function_sections)
1519 warning (0, "-ffunction-sections not supported for this target");
1520 flag_function_sections = 0;
1522 if (flag_data_sections)
1524 warning (0, "-fdata-sections not supported for this target");
1525 flag_data_sections = 0;
1529 if (flag_function_sections && profile_flag)
1531 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
1532 flag_function_sections = 0;
1535 #ifndef HAVE_prefetch
1536 if (flag_prefetch_loop_arrays > 0)
1538 warning (0, "-fprefetch-loop-arrays not supported for this target");
1539 flag_prefetch_loop_arrays = 0;
1542 if (flag_prefetch_loop_arrays > 0 && !HAVE_prefetch)
1544 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1545 flag_prefetch_loop_arrays = 0;
1549 /* This combination of options isn't handled for i386 targets and doesn't
1550 make much sense anyway, so don't allow it. */
1551 if (flag_prefetch_loop_arrays > 0 && optimize_size)
1553 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1554 flag_prefetch_loop_arrays = 0;
1557 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1558 if (flag_signaling_nans)
1559 flag_trapping_math = 1;
1561 /* We cannot reassociate if we want traps or signed zeros. */
1562 if (flag_associative_math && (flag_trapping_math || flag_signed_zeros))
1564 warning (0, "-fassociative-math disabled; other options take precedence");
1565 flag_associative_math = 0;
1568 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1569 if (flag_cx_limited_range)
1570 flag_complex_method = 0;
1572 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1573 if (flag_cx_fortran_rules)
1574 flag_complex_method = 1;
1576 /* Targets must be able to place spill slots at lower addresses. If the
1577 target already uses a soft frame pointer, the transition is trivial. */
1578 if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
1580 warning (0, "-fstack-protector not supported for this target");
1581 flag_stack_protect = 0;
1583 if (!flag_stack_protect)
1584 warn_stack_protect = 0;
1586 /* ??? Unwind info is not correct around the CFG unless either a frame
1587 pointer is present or A_O_A is set. Fixing this requires rewriting
1588 unwind info generation to be aware of the CFG and propagating states
1590 if (flag_unwind_tables && !ACCUMULATE_OUTGOING_ARGS
1591 && flag_omit_frame_pointer)
1593 warning (0, "unwind tables currently require a frame pointer "
1595 flag_omit_frame_pointer = 0;
1598 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1599 have not been set. */
1600 if (!global_options_set.x_warnings_are_errors
1601 && warn_coverage_mismatch
1602 && (global_dc->classify_diagnostic[OPT_Wcoverage_mismatch] ==
1604 diagnostic_classify_diagnostic (global_dc, OPT_Wcoverage_mismatch,
1605 DK_ERROR, UNKNOWN_LOCATION);
1607 /* Save the current optimization options. */
1608 optimization_default_node = build_optimization_node ();
1609 optimization_current_node = optimization_default_node;
1612 /* This function can be called multiple times to reinitialize the compiler
1613 back end when register classes or instruction sets have changed,
1614 before each function. */
1616 backend_init_target (void)
1618 /* Initialize alignment variables. */
1621 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
1622 to initialize reg_raw_mode[]. */
1625 /* This invokes target hooks to set fixed_reg[] etc, which is
1629 /* This depends on stack_pointer_rtx. */
1630 init_fake_stack_mems ();
1632 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1634 init_alias_target ();
1636 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1639 /* The following initialization functions need to generate rtl, so
1640 provide a dummy function context for them. */
1641 init_dummy_function_start ();
1643 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1644 on a mode change. */
1647 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1648 after a mode change as well. */
1649 caller_save_initialized_p = false;
1651 expand_dummy_function_end ();
1654 /* Initialize the compiler back end. This function is called only once,
1655 when starting the compiler. */
1662 init_inline_once ();
1663 init_varasm_once ();
1664 save_register_info ();
1666 /* Initialize the target-specific back end pieces. */
1668 backend_init_target ();
1671 /* Initialize excess precision settings. */
1673 init_excess_precision (void)
1675 /* Adjust excess precision handling based on the target options. If
1676 the front end cannot handle it, flag_excess_precision_cmdline
1677 will already have been set accordingly in the post_options
1679 gcc_assert (flag_excess_precision_cmdline != EXCESS_PRECISION_DEFAULT);
1680 flag_excess_precision = flag_excess_precision_cmdline;
1681 if (flag_unsafe_math_optimizations)
1682 flag_excess_precision = EXCESS_PRECISION_FAST;
1683 if (flag_excess_precision == EXCESS_PRECISION_STANDARD)
1685 int flt_eval_method = TARGET_FLT_EVAL_METHOD;
1686 switch (flt_eval_method)
1690 /* Either the target acts unpredictably (-1) or has all the
1691 operations required not to have excess precision (0). */
1692 flag_excess_precision = EXCESS_PRECISION_FAST;
1696 /* In these cases, predictable excess precision makes
1700 /* Any other implementation-defined FLT_EVAL_METHOD values
1701 require the compiler to handle the associated excess
1702 precision rules in excess_precision_type. */
1708 /* Initialize things that are both lang-dependent and target-dependent.
1709 This function can be called more than once if target parameters change. */
1711 lang_dependent_init_target (void)
1713 /* This determines excess precision settings. */
1714 init_excess_precision ();
1716 /* This creates various _DECL nodes, so needs to be called after the
1717 front end is initialized. It also depends on the HAVE_xxx macros
1718 generated from the target machine description. */
1721 /* The following initialization functions need to generate rtl, so
1722 provide a dummy function context for them. */
1723 init_dummy_function_start ();
1725 /* Do the target-specific parts of expr initialization. */
1726 init_expr_target ();
1728 /* Although the actions of these functions are language-independent,
1729 they use optabs, so we cannot call them from backend_init. */
1733 expand_dummy_function_end ();
1736 /* Language-dependent initialization. Returns nonzero on success. */
1738 lang_dependent_init (const char *name)
1740 location_t save_loc = input_location;
1741 if (dump_base_name == 0)
1742 dump_base_name = name && name[0] ? name : "gccdump";
1744 /* Other front-end initialization. */
1745 input_location = BUILTINS_LOCATION;
1746 if (lang_hooks.init () == 0)
1748 input_location = save_loc;
1752 init_asm_output (name);
1754 /* If stack usage information is desired, open the output file. */
1755 if (flag_stack_usage)
1756 stack_usage_file = open_auxiliary_file ("su");
1759 /* This creates various _DECL nodes, so needs to be called after the
1760 front end is initialized. */
1763 /* Do the target-specific parts of the initialization. */
1764 lang_dependent_init_target ();
1768 /* If dbx symbol table desired, initialize writing it and output the
1769 predefined types. */
1770 timevar_push (TV_SYMOUT);
1772 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
1773 if (dwarf2out_do_frame ())
1774 dwarf2out_frame_init ();
1777 /* Now we have the correct original filename, we can initialize
1779 (*debug_hooks->init) (name);
1781 timevar_pop (TV_SYMOUT);
1788 /* Reinitialize everything when target parameters, such as register usage,
1791 target_reinit (void)
1793 struct rtl_data saved_x_rtl;
1794 rtx *saved_regno_reg_rtx;
1796 /* Save *crtl and regno_reg_rtx around the reinitialization
1797 to allow target_reinit being called even after prepare_function_start. */
1798 saved_regno_reg_rtx = regno_reg_rtx;
1799 if (saved_regno_reg_rtx)
1801 saved_x_rtl = *crtl;
1802 memset (crtl, '\0', sizeof (*crtl));
1803 regno_reg_rtx = NULL;
1806 /* Reinitialize RTL backend. */
1807 backend_init_target ();
1809 /* Reinitialize lang-dependent parts. */
1810 lang_dependent_init_target ();
1812 /* And restore it at the end, as free_after_compilation from
1813 expand_dummy_function_end clears it. */
1814 if (saved_regno_reg_rtx)
1816 *crtl = saved_x_rtl;
1817 regno_reg_rtx = saved_regno_reg_rtx;
1818 saved_regno_reg_rtx = NULL;
1823 dump_memory_report (bool final)
1825 ggc_print_statistics ();
1826 stringpool_statistics ();
1827 dump_tree_statistics ();
1828 dump_gimple_statistics ();
1829 dump_rtx_statistics ();
1830 dump_alloc_pool_statistics ();
1831 dump_bitmap_statistics ();
1832 dump_vec_loc_statistics ();
1833 dump_ggc_loc_statistics (final);
1834 dump_alias_stats (stderr);
1835 dump_pta_stats (stderr);
1838 /* Clean up: close opened files, etc. */
1841 finalize (bool no_backend)
1843 /* Close the dump files. */
1844 if (flag_gen_aux_info)
1846 fclose (aux_info_file);
1848 unlink (aux_info_file_name);
1851 /* Close non-debugging input and output files. Take special care to note
1852 whether fclose returns an error, since the pages might still be on the
1853 buffer chain while the file is open. */
1857 if (ferror (asm_out_file) != 0)
1858 fatal_error ("error writing to %s: %m", asm_file_name);
1859 if (fclose (asm_out_file) != 0)
1860 fatal_error ("error closing %s: %m", asm_file_name);
1863 if (stack_usage_file)
1864 fclose (stack_usage_file);
1870 finish_optimization_passes ();
1876 dump_memory_report (true);
1878 /* Language-specific end of compilation actions. */
1879 lang_hooks.finish ();
1882 /* Initialize the compiler, and compile the input file. */
1886 /* Initialize timing first. The C front ends read the main file in
1887 the post_options hook, and C++ does file timings. */
1888 if (time_report || !quiet_flag || flag_detailed_statistics)
1890 timevar_start (TV_TOTAL);
1894 /* Don't do any more if an error has already occurred. */
1897 timevar_start (TV_PHASE_SETUP);
1899 /* This must be run always, because it is needed to compute the FP
1900 predefined macros, such as __LDBL_MAX__, for targets using non
1901 default FP formats. */
1902 init_adjust_machine_modes ();
1904 /* Set up the back-end if requested. */
1908 /* Language-dependent initialization. Returns true on success. */
1909 if (lang_dependent_init (main_input_filename))
1911 /* Initialize yet another pass. */
1913 ggc_protect_identifiers = true;
1916 init_final (main_input_filename);
1917 coverage_init (aux_base_name);
1919 invoke_plugin_callbacks (PLUGIN_START_UNIT, NULL);
1921 timevar_stop (TV_PHASE_SETUP);
1927 timevar_stop (TV_PHASE_SETUP);
1930 timevar_start (TV_PHASE_FINALIZE);
1932 finalize (no_backend);
1934 timevar_stop (TV_PHASE_FINALIZE);
1937 /* Stop timing and print the times. */
1938 timevar_stop (TV_TOTAL);
1939 timevar_print (stderr);
1942 /* Entry point of cc1, cc1plus, jc1, f771, etc.
1943 Exit code is FATAL_EXIT_CODE if can't open files or if there were
1944 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
1946 It is not safe to call this function more than once. */
1949 toplev_main (int argc, char **argv)
1951 expandargv (&argc, &argv);
1953 /* Initialization of GCC's environment, and diagnostics. */
1954 general_init (argv[0]);
1956 /* One-off initialization of options that does not need to be
1957 repeated when options are added for particular functions. */
1958 init_options_once ();
1960 /* Initialize global options structures; this must be repeated for
1961 each structure used for parsing options. */
1962 init_options_struct (&global_options, &global_options_set);
1963 lang_hooks.init_options_struct (&global_options);
1965 /* Convert the options to an array. */
1966 decode_cmdline_options_to_array_default_mask (argc,
1967 CONST_CAST2 (const char **,
1969 &save_decoded_options,
1970 &save_decoded_options_count);
1972 /* Perform language-specific options initialization. */
1973 lang_hooks.init_options (save_decoded_options_count, save_decoded_options);
1975 /* Parse the options and do minimal processing; basically just
1976 enough to default flags appropriately. */
1977 decode_options (&global_options, &global_options_set,
1978 save_decoded_options, save_decoded_options_count,
1979 UNKNOWN_LOCATION, global_dc);
1981 handle_common_deferred_options ();
1985 initialize_plugins ();
1988 print_version (stderr, "");
1991 print_plugins_help (stderr, "");
1993 /* Exit early if we can (e.g. -help). */
1994 if (!exit_after_options)
1997 if (warningcount || errorcount)
1998 print_ignored_options ();
1999 diagnostic_finish (global_dc);
2001 /* Invoke registered plugin callbacks if any. */
2002 invoke_plugin_callbacks (PLUGIN_FINISH, NULL);
2004 finalize_plugins ();
2006 return (FATAL_EXIT_CODE);
2008 return (SUCCESS_EXIT_CODE);