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 "common/common-target.h"
66 #include "langhooks.h"
67 #include "cfglayout.h"
69 #include "hosthooks.h"
72 #include "opts-diagnostic.h"
74 #include "value-prof.h"
75 #include "alloc-pool.h"
76 #include "tree-mudflap.h"
77 #include "tree-pass.h"
79 #include "tree-ssa-alias.h"
82 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
83 #include "dwarf2out.h"
86 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
90 #ifdef SDB_DEBUGGING_INFO
94 #ifdef XCOFF_DEBUGGING_INFO
95 #include "xcoffout.h" /* Needed for external data
96 declarations for e.g. AIX 4.x. */
99 static void general_init (const char *);
100 static void do_compile (void);
101 static void process_options (void);
102 static void backend_init (void);
103 static int lang_dependent_init (const char *);
104 static void init_asm_output (const char *);
105 static void finalize (bool);
107 static void crash_signal (int) ATTRIBUTE_NORETURN;
108 static void compile_file (void);
110 /* True if we don't need a backend (e.g. preprocessing only). */
111 static bool no_backend;
113 /* Length of line when printing switch values. */
116 /* Decoded options, and number of such options. */
117 struct cl_decoded_option *save_decoded_options;
118 unsigned int save_decoded_options_count;
120 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
121 to optimize in process_options (). */
122 #define AUTODETECT_VALUE 2
124 /* Debug hooks - dependent upon command line options. */
126 const struct gcc_debug_hooks *debug_hooks;
128 /* True if this is the lto front end. This is used to disable
129 gimple generation and lowering passes that are normally run on the
130 output of a front end. These passes must be bypassed for lto since
131 they have already been done before the gimple was written. */
133 bool in_lto_p = false;
135 /* The FUNCTION_DECL for the function currently being compiled,
136 or 0 if between functions. */
137 tree current_function_decl;
139 /* Set to the FUNC_BEGIN label of the current function, or NULL
141 const char * current_function_func_begin_label;
143 /* A random sequence of characters, unless overridden by user. */
144 static const char *flag_random_seed;
146 /* A local time stamp derived from the time of compilation. It will be
147 zero if the system cannot provide a time. It will be -1u, if the
148 user has specified a particular random seed. */
153 /* Generate code for GNU or NeXT Objective-C runtime environment. */
155 #ifdef NEXT_OBJC_RUNTIME
156 int flag_next_runtime = 1;
158 int flag_next_runtime = 0;
161 /* Nonzero means make permerror produce warnings instead of errors. */
163 int flag_permissive = 0;
165 /* When non-NULL, indicates that whenever space is allocated on the
166 stack, the resulting stack pointer must not pass this
167 address---that is, for stacks that grow downward, the stack pointer
168 must always be greater than or equal to this address; for stacks
169 that grow upward, the stack pointer must be less than this address.
170 At present, the rtx may be either a REG or a SYMBOL_REF, although
171 the support provided depends on the backend. */
174 /* True if the user has tagged the function with the 'section'
177 bool user_defined_section_attribute = false;
179 struct target_flag_state default_target_flag_state;
180 #if SWITCHABLE_TARGET
181 struct target_flag_state *this_target_flag_state = &default_target_flag_state;
183 #define this_target_flag_state (&default_target_flag_state)
188 const char *const string;
192 lang_independent_options;
194 /* The user symbol prefix after having resolved same. */
195 const char *user_label_prefix;
197 static const param_info lang_independent_params[] = {
198 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
199 { OPTION, DEFAULT, MIN, MAX, HELP },
200 #include "params.def"
202 { NULL, 0, 0, 0, NULL }
205 /* Output files for assembler code (real compiler output)
206 and debugging dumps. */
210 FILE *stack_usage_file = NULL;
211 FILE *dump_file = NULL;
212 const char *dump_file_name;
214 /* The current working directory of a translation. It's generally the
215 directory from which compilation was initiated, but a preprocessed
216 file may specify the original directory in which it was
219 static const char *src_pwd;
221 /* Initialize src_pwd with the given string, and return true. If it
222 was already initialized, return false. As a special case, it may
223 be called with a NULL argument to test whether src_pwd has NOT been
227 set_src_pwd (const char *pwd)
231 if (strcmp (src_pwd, pwd) == 0)
237 src_pwd = xstrdup (pwd);
241 /* Return the directory from which the translation unit was initiated,
242 in case set_src_pwd() was not called before to assign it a
258 /* Called when the start of a function definition is parsed,
259 this function prints on stderr the name of the function. */
261 announce_function (tree decl)
265 if (rtl_dump_and_exit)
266 fprintf (stderr, "%s ",
267 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl))));
269 fprintf (stderr, " %s",
270 identifier_to_locale (lang_hooks.decl_printable_name (decl, 2)));
272 pp_needs_newline (global_dc->printer) = true;
273 diagnostic_set_last_function (global_dc, (diagnostic_info *) NULL);
277 /* Initialize local_tick with the time of day, or -1 if
278 flag_random_seed is set. */
281 init_local_tick (void)
283 if (!flag_random_seed)
285 /* Get some more or less random data. */
286 #ifdef HAVE_GETTIMEOFDAY
290 gettimeofday (&tv, NULL);
291 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
295 time_t now = time (NULL);
297 if (now != (time_t)-1)
298 local_tick = (unsigned) now;
306 /* Set up a default flag_random_seed and local_tick, unless the user
307 already specified one. Must be called after init_local_tick. */
310 init_random_seed (void)
312 unsigned HOST_WIDE_INT value;
313 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
315 value = local_tick ^ getpid ();
317 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
318 flag_random_seed = random_seed;
321 /* Obtain the random_seed string. Unless NOINIT, initialize it if
322 it's not provided in the command line. */
325 get_random_seed (bool noinit)
327 if (!flag_random_seed && !noinit)
329 return flag_random_seed;
332 /* Modify the random_seed string to VAL. Return its previous
336 set_random_seed (const char *val)
338 const char *old = flag_random_seed;
339 flag_random_seed = val;
343 /* Handler for fatal signals, such as SIGSEGV. These are transformed
344 into ICE messages, which is much more user friendly. In case the
345 error printer crashes, reset the signal to prevent infinite recursion. */
348 crash_signal (int signo)
350 signal (signo, SIG_DFL);
352 /* If we crashed while processing an ASM statement, then be a little more
353 graceful. It's most likely the user's fault. */
354 if (this_is_asm_operands)
356 output_operand_lossage ("unrecoverable error");
357 exit (FATAL_EXIT_CODE);
360 internal_error ("%s", strsignal (signo));
363 /* A subroutine of wrapup_global_declarations. We've come to the end of
364 the compilation unit. All deferred variables should be undeferred,
365 and all incomplete decls should be finalized. */
368 wrapup_global_declaration_1 (tree decl)
370 /* We're not deferring this any longer. Assignment is conditional to
371 avoid needlessly dirtying PCH pages. */
372 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl), TS_DECL_WITH_VIS)
373 && DECL_DEFER_OUTPUT (decl) != 0)
374 DECL_DEFER_OUTPUT (decl) = 0;
376 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
377 lang_hooks.finish_incomplete_decl (decl);
380 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
381 needs to be output. Return true if it is output. */
384 wrapup_global_declaration_2 (tree decl)
386 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
389 /* Don't write out static consts, unless we still need them.
391 We also keep static consts if not optimizing (for debugging),
392 unless the user specified -fno-keep-static-consts.
393 ??? They might be better written into the debug information.
394 This is possible when using DWARF.
396 A language processor that wants static constants to be always
397 written out (even if it is not used) is responsible for
398 calling rest_of_decl_compilation itself. E.g. the C front-end
399 calls rest_of_decl_compilation from finish_decl.
400 One motivation for this is that is conventional in some
401 environments to write things like:
402 static const char rcsid[] = "... version string ...";
403 intending to force the string to be in the executable.
405 A language processor that would prefer to have unneeded
406 static constants "optimized away" would just defer writing
407 them out until here. E.g. C++ does this, because static
408 constants are often defined in header files.
410 ??? A tempting alternative (for both C and C++) would be
411 to force a constant to be written if and only if it is
412 defined in a main file, as opposed to an include file. */
414 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
416 struct varpool_node *node;
418 node = varpool_get_node (decl);
420 if (!node && flag_ltrans)
422 else if (node && node->finalized)
424 else if (node && node->alias)
426 else if (!cgraph_global_info_ready
428 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
430 else if (node && node->needed)
432 else if (DECL_COMDAT (decl))
434 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
435 && (optimize || !flag_keep_static_consts
436 || DECL_ARTIFICIAL (decl)))
441 rest_of_decl_compilation (decl, 1, 1);
449 /* Do any final processing required for the declarations in VEC, of
450 which there are LEN. We write out inline functions and variables
451 that have been deferred until this point, but which are required.
452 Returns nonzero if anything was put out. */
455 wrapup_global_declarations (tree *vec, int len)
457 bool reconsider, output_something = false;
460 for (i = 0; i < len; i++)
461 wrapup_global_declaration_1 (vec[i]);
463 /* Now emit any global variables or functions that we have been
464 putting off. We need to loop in case one of the things emitted
465 here references another one which comes earlier in the list. */
469 for (i = 0; i < len; i++)
470 reconsider |= wrapup_global_declaration_2 (vec[i]);
472 output_something = true;
476 return output_something;
479 /* A subroutine of check_global_declarations. Issue appropriate warnings
480 for the global declaration DECL. */
483 check_global_declaration_1 (tree decl)
485 /* Warn about any function declared static but not defined. We don't
486 warn about variables, because many programs have static variables
487 that exist only to get some text into the object file. */
488 if (TREE_CODE (decl) == FUNCTION_DECL
489 && DECL_INITIAL (decl) == 0
490 && DECL_EXTERNAL (decl)
491 && ! DECL_ARTIFICIAL (decl)
492 && ! TREE_NO_WARNING (decl)
493 && ! TREE_PUBLIC (decl)
494 && (warn_unused_function
495 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
497 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
498 pedwarn (input_location, 0, "%q+F used but never defined", decl);
500 warning (OPT_Wunused_function, "%q+F declared %<static%> but never defined", decl);
501 /* This symbol is effectively an "extern" declaration now. */
502 TREE_PUBLIC (decl) = 1;
503 assemble_external (decl);
506 /* Warn about static fns or vars defined but not used. */
507 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
508 /* We don't warn about "static const" variables because the
509 "rcs_id" idiom uses that construction. */
510 || (warn_unused_variable
511 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
512 && ! DECL_IN_SYSTEM_HEADER (decl)
513 && ! TREE_USED (decl)
514 /* The TREE_USED bit for file-scope decls is kept in the identifier,
515 to handle multiple external decls in different scopes. */
516 && ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl)))
517 && ! DECL_EXTERNAL (decl)
518 && ! TREE_PUBLIC (decl)
519 /* A volatile variable might be used in some non-obvious way. */
520 && ! TREE_THIS_VOLATILE (decl)
521 /* Global register variables must be declared to reserve them. */
522 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
523 /* Otherwise, ask the language. */
524 && lang_hooks.decls.warn_unused_global (decl))
525 warning ((TREE_CODE (decl) == FUNCTION_DECL)
526 ? OPT_Wunused_function
527 : OPT_Wunused_variable,
528 "%q+D defined but not used", decl);
531 /* Issue appropriate warnings for the global declarations in VEC (of
532 which there are LEN). */
535 check_global_declarations (tree *vec, int len)
539 for (i = 0; i < len; i++)
540 check_global_declaration_1 (vec[i]);
543 /* Emit debugging information for all global declarations in VEC. */
546 emit_debug_global_declarations (tree *vec, int len)
550 /* Avoid confusing the debug information machinery when there are errors. */
554 timevar_push (TV_SYMOUT);
555 for (i = 0; i < len; i++)
556 debug_hooks->global_decl (vec[i]);
557 timevar_pop (TV_SYMOUT);
560 /* Compile an entire translation unit. Write a file of assembly
561 output and various debugging dumps. */
566 timevar_start (TV_PHASE_PARSING);
567 timevar_push (TV_PARSE_GLOBAL);
569 /* Call the parser, which parses the entire file (calling
570 rest_of_compilation for each function). */
571 lang_hooks.parse_file ();
573 timevar_pop (TV_PARSE_GLOBAL);
574 timevar_stop (TV_PHASE_PARSING);
576 /* Compilation is now finished except for writing
577 what's left of the symbol table output. */
579 if (flag_syntax_only || flag_wpa)
582 timevar_start (TV_PHASE_GENERATE);
584 ggc_protect_identifiers = false;
586 /* This must also call cgraph_finalize_compilation_unit. */
587 lang_hooks.decls.final_write_globals ();
591 timevar_stop (TV_PHASE_GENERATE);
595 varpool_assemble_pending_decls ();
598 /* Likewise for mudflap static object registrations. */
600 mudflap_finish_file ();
602 output_shared_constant_pool ();
603 output_object_blocks ();
605 /* Write out any pending weak symbol declarations. */
608 /* This must be at the end before unwind and debug info.
609 Some target ports emit PIC setup thunks here. */
610 targetm.asm_out.code_end ();
612 /* Do dbx symbols. */
613 timevar_push (TV_SYMOUT);
615 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
616 if (dwarf2out_do_frame ())
617 dwarf2out_frame_finish ();
620 (*debug_hooks->finish) (main_input_filename);
621 timevar_pop (TV_SYMOUT);
623 /* Output some stuff at end of file if nec. */
625 dw2_output_indirect_constants ();
627 /* Flush any pending external directives. */
628 process_pending_assemble_externals ();
630 /* Emit LTO marker if LTO info has been previously emitted. This is
631 used by collect2 to determine whether an object file contains IL.
632 We used to emit an undefined reference here, but this produces
633 link errors if an object file with IL is stored into a shared
634 library without invoking lto1. */
635 if (flag_generate_lto)
637 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
638 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
640 (unsigned HOST_WIDE_INT) 1, 8);
641 #elif defined ASM_OUTPUT_ALIGNED_COMMON
642 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_v1",
643 (unsigned HOST_WIDE_INT) 1, 8);
645 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_v1",
646 (unsigned HOST_WIDE_INT) 1,
647 (unsigned HOST_WIDE_INT) 1);
651 /* Attach a special .ident directive to the end of the file to identify
652 the version of GCC which compiled this code. The format of the .ident
653 string is patterned after the ones produced by native SVR4 compilers. */
657 const char *pkg_version = "(GNU) ";
659 if (strcmp ("(GCC) ", pkgversion_string))
660 pkg_version = pkgversion_string;
661 fprintf (asm_out_file, "%s\"GCC: %s%s\"\n",
662 IDENT_ASM_OP, pkg_version, version_string);
666 /* Invoke registered plugin callbacks. */
667 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT, NULL);
669 /* This must be at the end. Some target ports emit end of file directives
670 into the assembly file here, and hence we can not output anything to the
671 assembly file after this point. */
672 targetm.asm_out.file_end ();
674 timevar_stop (TV_PHASE_GENERATE);
677 /* Indexed by enum debug_info_type. */
678 const char *const debug_type_names[] =
680 "none", "stabs", "coff", "dwarf-2", "xcoff", "vms"
683 /* Print version information to FILE.
684 Each line begins with INDENT (for the case where FILE is the
685 assembler output file). */
688 print_version (FILE *file, const char *indent)
690 static const char fmt1[] =
692 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
694 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
697 static const char fmt2[] =
698 N_("GMP version %s, MPFR version %s, MPC version %s\n");
699 static const char fmt3[] =
700 N_("%s%swarning: %s header version %s differs from library version %s.\n");
701 static const char fmt4[] =
702 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
704 #define __VERSION__ "[?]"
707 file == stderr ? _(fmt1) : fmt1,
708 indent, *indent != 0 ? " " : "",
709 lang_hooks.name, pkgversion_string, version_string, TARGET_NAME,
710 indent, __VERSION__);
712 /* We need to stringify the GMP macro values. Ugh, gmp_version has
713 two string formats, "i.j.k" and "i.j" when k is zero. As of
714 gmp-4.3.0, GMP always uses the 3 number format. */
715 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
716 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3(X)
717 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
718 #define GCC_GMP_VERSION \
719 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
720 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
721 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
722 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR)
724 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
725 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) "." \
726 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_PATCHLEVEL)
729 file == stderr ? _(fmt2) : fmt2,
730 GCC_GMP_STRINGIFY_VERSION, MPFR_VERSION_STRING, MPC_VERSION_STRING);
731 if (strcmp (GCC_GMP_STRINGIFY_VERSION, gmp_version))
733 file == stderr ? _(fmt3) : fmt3,
734 indent, *indent != 0 ? " " : "",
735 "GMP", GCC_GMP_STRINGIFY_VERSION, gmp_version);
736 if (strcmp (MPFR_VERSION_STRING, mpfr_get_version ()))
738 file == stderr ? _(fmt3) : fmt3,
739 indent, *indent != 0 ? " " : "",
740 "MPFR", MPFR_VERSION_STRING, mpfr_get_version ());
741 if (strcmp (MPC_VERSION_STRING, mpc_get_version ()))
743 file == stderr ? _(fmt3) : fmt3,
744 indent, *indent != 0 ? " " : "",
745 "MPC", MPC_VERSION_STRING, mpc_get_version ());
747 file == stderr ? _(fmt4) : fmt4,
748 indent, *indent != 0 ? " " : "",
749 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
751 print_plugins_versions (file, indent);
754 #ifdef ASM_COMMENT_START
756 print_to_asm_out_file (print_switch_type type, const char * text)
758 bool prepend_sep = true;
762 case SWITCH_TYPE_LINE_END:
763 putc ('\n', asm_out_file);
766 case SWITCH_TYPE_LINE_START:
767 fputs (ASM_COMMENT_START, asm_out_file);
768 return strlen (ASM_COMMENT_START);
770 case SWITCH_TYPE_DESCRIPTIVE:
771 if (ASM_COMMENT_START[0] == 0)
774 case SWITCH_TYPE_PASSED:
775 case SWITCH_TYPE_ENABLED:
777 fputc (' ', asm_out_file);
778 fputs (text, asm_out_file);
779 /* No need to return the length here as
780 print_single_switch has already done it. */
790 print_to_stderr (print_switch_type type, const char * text)
794 case SWITCH_TYPE_LINE_END:
798 case SWITCH_TYPE_LINE_START:
801 case SWITCH_TYPE_PASSED:
802 case SWITCH_TYPE_ENABLED:
806 case SWITCH_TYPE_DESCRIPTIVE:
807 fputs (text, stderr);
808 /* No need to return the length here as
809 print_single_switch has already done it. */
817 /* Print an option value and return the adjusted position in the line.
818 ??? print_fn doesn't handle errors, eg disk full; presumably other
819 code will catch a disk full though. */
822 print_single_switch (print_switch_fn_type print_fn,
824 print_switch_type type,
827 /* The ultrix fprintf returns 0 on success, so compute the result
828 we want here since we need it for the following test. The +1
829 is for the separator character that will probably be emitted. */
830 int len = strlen (text) + 1;
833 && pos + len > MAX_LINE)
835 print_fn (SWITCH_TYPE_LINE_END, NULL);
840 pos += print_fn (SWITCH_TYPE_LINE_START, NULL);
842 print_fn (type, text);
846 /* Print active target switches using PRINT_FN.
847 POS is the current cursor position and MAX is the size of a "line".
848 Each line begins with INDENT and ends with TERM.
849 Each switch is separated from the next by SEP. */
852 print_switch_values (print_switch_fn_type print_fn)
857 /* Fill in the -frandom-seed option, if the user didn't pass it, so
858 that it can be printed below. This helps reproducibility. */
859 if (!flag_random_seed)
862 /* Print the options as passed. */
863 pos = print_single_switch (print_fn, pos,
864 SWITCH_TYPE_DESCRIPTIVE, _("options passed: "));
866 for (j = 1; j < save_decoded_options_count; j++)
868 switch (save_decoded_options[j].opt_index)
881 pos = print_single_switch (print_fn, pos, SWITCH_TYPE_PASSED,
882 save_decoded_options[j].orig_option_with_args_text);
886 print_fn (SWITCH_TYPE_LINE_END, NULL);
888 /* Print the -f and -m options that have been enabled.
889 We don't handle language specific options but printing argv
891 pos = print_single_switch (print_fn, 0,
892 SWITCH_TYPE_DESCRIPTIVE, _("options enabled: "));
894 for (j = 0; j < cl_options_count; j++)
895 if (cl_options[j].cl_report
896 && option_enabled (j, &global_options) > 0)
897 pos = print_single_switch (print_fn, pos,
898 SWITCH_TYPE_ENABLED, cl_options[j].opt_text);
900 print_fn (SWITCH_TYPE_LINE_END, NULL);
903 /* Open assembly code output file. Do this even if -fsyntax-only is
904 on, because then the driver will have provided the name of a
905 temporary file or bit bucket for us. NAME is the file specified on
906 the command line, possibly NULL. */
908 init_asm_output (const char *name)
910 if (name == NULL && asm_file_name == 0)
911 asm_out_file = stdout;
914 if (asm_file_name == 0)
916 int len = strlen (dump_base_name);
917 char *dumpname = XNEWVEC (char, len + 6);
919 memcpy (dumpname, dump_base_name, len + 1);
920 strip_off_ending (dumpname, len);
921 strcat (dumpname, ".s");
922 asm_file_name = dumpname;
924 if (!strcmp (asm_file_name, "-"))
925 asm_out_file = stdout;
927 asm_out_file = fopen (asm_file_name, "w+b");
928 if (asm_out_file == 0)
929 fatal_error ("can%'t open %s for writing: %m", asm_file_name);
932 if (!flag_syntax_only)
934 targetm.asm_out.file_start ();
936 if (flag_record_gcc_switches)
938 if (targetm.asm_out.record_gcc_switches)
940 /* Let the target know that we are about to start recording. */
941 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
943 /* Now record the switches. */
944 print_switch_values (targetm.asm_out.record_gcc_switches);
945 /* Let the target know that the recording is over. */
946 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
950 inform (input_location, "-frecord-gcc-switches is not supported by the current target");
953 #ifdef ASM_COMMENT_START
954 if (flag_verbose_asm)
956 /* Print the list of switches in effect
957 into the assembler file as comments. */
958 print_version (asm_out_file, ASM_COMMENT_START);
959 print_switch_values (print_to_asm_out_file);
960 putc ('\n', asm_out_file);
966 /* Default tree printer. Handles declarations only. */
968 default_tree_printer (pretty_printer *pp, text_info *text, const char *spec,
969 int precision, bool wide, bool set_locus, bool hash)
973 /* FUTURE: %+x should set the locus. */
974 if (precision != 0 || wide || hash)
980 t = va_arg (*text->args_ptr, tree);
981 if (TREE_CODE (t) == IDENTIFIER_NODE)
983 pp_identifier (pp, IDENTIFIER_POINTER (t));
989 t = va_arg (*text->args_ptr, tree);
990 if (DECL_DEBUG_EXPR_IS_FROM (t) && DECL_DEBUG_EXPR (t))
991 t = DECL_DEBUG_EXPR (t);
996 t = va_arg (*text->args_ptr, tree);
1000 percent_K_format (text);
1007 if (set_locus && text->locus)
1008 *text->locus = DECL_SOURCE_LOCATION (t);
1012 const char *n = DECL_NAME (t)
1013 ? identifier_to_locale (lang_hooks.decl_printable_name (t, 2))
1018 dump_generic_node (pp, t, 0, TDF_DIAGNOSTIC, 0);
1023 /* A helper function; used as the reallocator function for cpp's line
1026 realloc_for_line_map (void *ptr, size_t len)
1028 return GGC_RESIZEVAR (void, ptr, len);
1031 /* A helper function: used as the allocator function for
1032 identifier_to_locale. */
1034 alloc_for_identifier_to_locale (size_t len)
1036 return ggc_alloc_atomic (len);
1039 /* Output stack usage information. */
1041 output_stack_usage (void)
1043 static bool warning_issued = false;
1044 enum stack_usage_kind_type { STATIC = 0, DYNAMIC, DYNAMIC_BOUNDED };
1045 const char *stack_usage_kind_str[] = {
1050 HOST_WIDE_INT stack_usage = current_function_static_stack_size;
1051 enum stack_usage_kind_type stack_usage_kind;
1053 if (stack_usage < 0)
1055 if (!warning_issued)
1057 warning (0, "stack usage computation not supported for this target");
1058 warning_issued = true;
1063 stack_usage_kind = STATIC;
1065 /* Add the maximum amount of space pushed onto the stack. */
1066 if (current_function_pushed_stack_size > 0)
1068 stack_usage += current_function_pushed_stack_size;
1069 stack_usage_kind = DYNAMIC_BOUNDED;
1072 /* Now on to the tricky part: dynamic stack allocation. */
1073 if (current_function_allocates_dynamic_stack_space)
1075 if (current_function_has_unbounded_dynamic_stack_size)
1076 stack_usage_kind = DYNAMIC;
1078 stack_usage_kind = DYNAMIC_BOUNDED;
1080 /* Add the size even in the unbounded case, this can't hurt. */
1081 stack_usage += current_function_dynamic_stack_size;
1084 if (flag_stack_usage)
1086 expanded_location loc
1087 = expand_location (DECL_SOURCE_LOCATION (current_function_decl));
1088 const char *raw_id, *id;
1090 /* Strip the scope prefix if any. */
1091 raw_id = lang_hooks.decl_printable_name (current_function_decl, 2);
1092 id = strrchr (raw_id, '.');
1098 fprintf (stack_usage_file,
1099 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC"\t%s\n",
1100 lbasename (loc.file),
1105 stack_usage_kind_str[stack_usage_kind]);
1108 if (warn_stack_usage >= 0)
1110 if (stack_usage_kind == DYNAMIC)
1111 warning (OPT_Wstack_usage_, "stack usage might be unbounded");
1112 else if (stack_usage > warn_stack_usage)
1114 if (stack_usage_kind == DYNAMIC_BOUNDED)
1115 warning (OPT_Wstack_usage_, "stack usage might be %wd bytes",
1118 warning (OPT_Wstack_usage_, "stack usage is %wd bytes",
1124 /* Open an auxiliary output file. */
1126 open_auxiliary_file (const char *ext)
1131 filename = concat (aux_base_name, ".", ext, NULL);
1132 file = fopen (filename, "w");
1134 fatal_error ("can%'t open %s for writing: %m", filename);
1139 /* Initialization of the front end environment, before command line
1140 options are parsed. Signal handlers, internationalization etc.
1141 ARGV0 is main's argv[0]. */
1143 general_init (const char *argv0)
1147 p = argv0 + strlen (argv0);
1148 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1152 xmalloc_set_program_name (progname);
1156 /* Unlock the stdio streams. */
1157 unlock_std_streams ();
1159 gcc_init_libintl ();
1161 identifier_to_locale_alloc = alloc_for_identifier_to_locale;
1162 identifier_to_locale_free = ggc_free;
1164 /* Initialize the diagnostics reporting machinery, so option parsing
1165 can give warnings and errors. */
1166 diagnostic_initialize (global_dc, N_OPTS);
1167 diagnostic_starter (global_dc) = default_tree_diagnostic_starter;
1168 /* Set a default printer. Language specific initializations will
1169 override it later. */
1170 pp_format_decoder (global_dc->printer) = &default_tree_printer;
1171 global_dc->show_option_requested
1172 = global_options_init.x_flag_diagnostics_show_option;
1173 global_dc->show_column
1174 = global_options_init.x_flag_show_column;
1175 global_dc->internal_error = plugins_internal_error_function;
1176 global_dc->option_enabled = option_enabled;
1177 global_dc->option_state = &global_options;
1178 global_dc->option_name = option_name;
1180 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1182 signal (SIGSEGV, crash_signal);
1185 signal (SIGILL, crash_signal);
1188 signal (SIGBUS, crash_signal);
1191 signal (SIGABRT, crash_signal);
1193 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1194 signal (SIGIOT, crash_signal);
1197 signal (SIGFPE, crash_signal);
1200 /* Other host-specific signal setup. */
1201 (*host_hooks.extra_signals)();
1203 /* Initialize the garbage-collector, string pools and tree type hash
1207 line_table = ggc_alloc_line_maps ();
1208 linemap_init (line_table);
1209 line_table->reallocator = realloc_for_line_map;
1212 /* Initialize register usage now so switches may override. */
1215 /* Register the language-independent parameters. */
1216 add_params (lang_independent_params, LAST_PARAM);
1217 targetm.target_option.default_params ();
1219 /* This must be done after add_params but before argument processing. */
1220 init_ggc_heuristics();
1221 init_optimization_passes ();
1222 statistics_early_init ();
1226 /* Return true if the current target supports -fsection-anchors. */
1229 target_supports_section_anchors_p (void)
1231 if (targetm.min_anchor_offset == 0 && targetm.max_anchor_offset == 0)
1234 if (targetm.asm_out.output_anchor == NULL)
1240 /* Default the align_* variables to 1 if they're still unset, and
1241 set up the align_*_log variables. */
1243 init_alignments (void)
1245 if (align_loops <= 0)
1247 if (align_loops_max_skip > align_loops)
1248 align_loops_max_skip = align_loops - 1;
1249 align_loops_log = floor_log2 (align_loops * 2 - 1);
1250 if (align_jumps <= 0)
1252 if (align_jumps_max_skip > align_jumps)
1253 align_jumps_max_skip = align_jumps - 1;
1254 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1255 if (align_labels <= 0)
1257 align_labels_log = floor_log2 (align_labels * 2 - 1);
1258 if (align_labels_max_skip > align_labels)
1259 align_labels_max_skip = align_labels - 1;
1260 if (align_functions <= 0)
1261 align_functions = 1;
1262 align_functions_log = floor_log2 (align_functions * 2 - 1);
1265 /* Process the options that have been parsed. */
1267 process_options (void)
1269 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1270 This can happen with incorrect pre-processed input. */
1271 debug_hooks = &do_nothing_debug_hooks;
1273 maximum_field_alignment = initial_max_fld_align * BITS_PER_UNIT;
1275 /* Allow the front end to perform consistency checks and do further
1276 initialization based on the command line options. This hook also
1277 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1278 so we can correctly initialize debug output. */
1279 no_backend = lang_hooks.post_options (&main_input_filename);
1281 /* Some machines may reject certain combinations of options. */
1282 targetm.target_option.override ();
1284 /* Avoid any informative notes in the second run of -fcompare-debug. */
1285 if (flag_compare_debug)
1286 diagnostic_inhibit_notes (global_dc);
1288 if (flag_section_anchors && !target_supports_section_anchors_p ())
1290 warning (OPT_fsection_anchors,
1291 "this target does not support %qs", "-fsection-anchors");
1292 flag_section_anchors = 0;
1295 if (flag_short_enums == 2)
1296 flag_short_enums = targetm.default_short_enums ();
1298 /* Set aux_base_name if not already set. */
1301 else if (main_input_filename)
1303 char *name = xstrdup (lbasename (main_input_filename));
1305 strip_off_ending (name, strlen (name));
1306 aux_base_name = name;
1309 aux_base_name = "gccaux";
1313 || flag_graphite_identity
1315 || flag_loop_flatten
1316 || flag_loop_interchange
1317 || flag_loop_strip_mine
1318 || flag_loop_parallelize_all)
1319 sorry ("Graphite loop optimizations cannot be used (-fgraphite, "
1320 "-fgraphite-identity, -floop-block, -floop-flatten, "
1321 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1322 "and -ftree-loop-linear)");
1325 /* Unrolling all loops implies that standard loop unrolling must also
1327 if (flag_unroll_all_loops)
1328 flag_unroll_loops = 1;
1330 /* web and rename-registers help when run after loop unrolling. */
1331 if (flag_web == AUTODETECT_VALUE)
1332 flag_web = flag_unroll_loops || flag_peel_loops;
1334 if (flag_rename_registers == AUTODETECT_VALUE)
1335 flag_rename_registers = flag_unroll_loops || flag_peel_loops;
1337 if (flag_non_call_exceptions)
1338 flag_asynchronous_unwind_tables = 1;
1339 if (flag_asynchronous_unwind_tables)
1340 flag_unwind_tables = 1;
1342 if (flag_value_profile_transformations)
1343 flag_profile_values = 1;
1345 /* Warn about options that are not supported on this machine. */
1346 #ifndef INSN_SCHEDULING
1347 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1348 warning (0, "instruction scheduling not supported on this target machine");
1351 if (flag_delayed_branch)
1352 warning (0, "this target machine does not have delayed branches");
1355 user_label_prefix = USER_LABEL_PREFIX;
1356 if (flag_leading_underscore != -1)
1358 /* If the default prefix is more complicated than "" or "_",
1359 issue a warning and ignore this option. */
1360 if (user_label_prefix[0] == 0 ||
1361 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1363 user_label_prefix = flag_leading_underscore ? "_" : "";
1366 warning (0, "-f%sleading-underscore not supported on this target machine",
1367 flag_leading_underscore ? "" : "no-");
1370 /* If we are in verbose mode, write out the version and maybe all the
1371 option flags in use. */
1374 print_version (stderr, "");
1376 print_switch_values (print_to_stderr);
1379 if (flag_syntax_only)
1381 write_symbols = NO_DEBUG;
1387 if (debug_info_level == DINFO_LEVEL_NONE)
1389 debug_info_level = DINFO_LEVEL_NORMAL;
1391 if (write_symbols == NO_DEBUG)
1392 write_symbols = PREFERRED_DEBUGGING_TYPE;
1395 debug_info_level = DINFO_LEVEL_NONE;
1398 if (flag_dump_final_insns && !flag_syntax_only && !no_backend)
1400 FILE *final_output = fopen (flag_dump_final_insns, "w");
1403 error ("could not open final insn dump file %qs: %m",
1404 flag_dump_final_insns);
1405 flag_dump_final_insns = NULL;
1407 else if (fclose (final_output))
1409 error ("could not close zeroed insn dump file %qs: %m",
1410 flag_dump_final_insns);
1411 flag_dump_final_insns = NULL;
1415 /* Unless over-ridden for the target, assume that all DWARF levels
1416 may be emitted, if DWARF2_DEBUG is selected. */
1417 if (dwarf_strict < 0)
1420 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1422 if (debug_info_level == DINFO_LEVEL_NONE)
1423 write_symbols = NO_DEBUG;
1425 if (write_symbols == NO_DEBUG)
1427 #if defined(DBX_DEBUGGING_INFO)
1428 else if (write_symbols == DBX_DEBUG)
1429 debug_hooks = &dbx_debug_hooks;
1431 #if defined(XCOFF_DEBUGGING_INFO)
1432 else if (write_symbols == XCOFF_DEBUG)
1433 debug_hooks = &xcoff_debug_hooks;
1435 #ifdef SDB_DEBUGGING_INFO
1436 else if (write_symbols == SDB_DEBUG)
1437 debug_hooks = &sdb_debug_hooks;
1439 #ifdef DWARF2_DEBUGGING_INFO
1440 else if (write_symbols == DWARF2_DEBUG)
1441 debug_hooks = &dwarf2_debug_hooks;
1443 #ifdef VMS_DEBUGGING_INFO
1444 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1445 debug_hooks = &vmsdbg_debug_hooks;
1448 error ("target system does not support the \"%s\" debug format",
1449 debug_type_names[write_symbols]);
1451 /* We know which debug output will be used so we can set flag_var_tracking
1452 and flag_var_tracking_uninit if the user has not specified them. */
1453 if (debug_info_level < DINFO_LEVEL_NORMAL
1454 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
1456 if (flag_var_tracking == 1
1457 || flag_var_tracking_uninit == 1)
1459 if (debug_info_level < DINFO_LEVEL_NORMAL)
1460 warning (0, "variable tracking requested, but useless unless "
1461 "producing debug info");
1463 warning (0, "variable tracking requested, but not supported "
1464 "by this debug format");
1466 flag_var_tracking = 0;
1467 flag_var_tracking_uninit = 0;
1470 /* The debug hooks are used to implement -fdump-go-spec because it
1471 gives a simple and stable API for all the information we need to
1473 if (flag_dump_go_spec != NULL)
1474 debug_hooks = dump_go_spec_init (flag_dump_go_spec, debug_hooks);
1476 /* If the user specifically requested variable tracking with tagging
1477 uninitialized variables, we need to turn on variable tracking.
1478 (We already determined above that variable tracking is feasible.) */
1479 if (flag_var_tracking_uninit)
1480 flag_var_tracking = 1;
1482 if (flag_var_tracking == AUTODETECT_VALUE)
1483 flag_var_tracking = optimize >= 1;
1485 if (flag_var_tracking_assignments == AUTODETECT_VALUE)
1486 flag_var_tracking_assignments = flag_var_tracking
1487 && !(flag_selective_scheduling || flag_selective_scheduling2);
1489 if (flag_var_tracking_assignments_toggle)
1490 flag_var_tracking_assignments = !flag_var_tracking_assignments;
1492 if (flag_var_tracking_assignments && !flag_var_tracking)
1493 flag_var_tracking = flag_var_tracking_assignments = -1;
1495 if (flag_var_tracking_assignments
1496 && (flag_selective_scheduling || flag_selective_scheduling2))
1497 warning (0, "var-tracking-assignments changes selective scheduling");
1499 if (flag_tree_cselim == AUTODETECT_VALUE)
1500 #ifdef HAVE_conditional_move
1501 flag_tree_cselim = 1;
1503 flag_tree_cselim = 0;
1506 /* If auxiliary info generation is desired, open the output file.
1507 This goes in the same directory as the source file--unlike
1508 all the other output files. */
1509 if (flag_gen_aux_info)
1511 aux_info_file = fopen (aux_info_file_name, "w");
1512 if (aux_info_file == 0)
1513 fatal_error ("can%'t open %s: %m", aux_info_file_name);
1516 if (!targetm_common.have_named_sections)
1518 if (flag_function_sections)
1520 warning (0, "-ffunction-sections not supported for this target");
1521 flag_function_sections = 0;
1523 if (flag_data_sections)
1525 warning (0, "-fdata-sections not supported for this target");
1526 flag_data_sections = 0;
1530 if (flag_function_sections && profile_flag)
1532 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
1533 flag_function_sections = 0;
1536 #ifndef HAVE_prefetch
1537 if (flag_prefetch_loop_arrays > 0)
1539 warning (0, "-fprefetch-loop-arrays not supported for this target");
1540 flag_prefetch_loop_arrays = 0;
1543 if (flag_prefetch_loop_arrays > 0 && !HAVE_prefetch)
1545 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1546 flag_prefetch_loop_arrays = 0;
1550 /* This combination of options isn't handled for i386 targets and doesn't
1551 make much sense anyway, so don't allow it. */
1552 if (flag_prefetch_loop_arrays > 0 && optimize_size)
1554 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1555 flag_prefetch_loop_arrays = 0;
1558 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1559 if (flag_signaling_nans)
1560 flag_trapping_math = 1;
1562 /* We cannot reassociate if we want traps or signed zeros. */
1563 if (flag_associative_math && (flag_trapping_math || flag_signed_zeros))
1565 warning (0, "-fassociative-math disabled; other options take precedence");
1566 flag_associative_math = 0;
1569 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1570 if (flag_cx_limited_range)
1571 flag_complex_method = 0;
1573 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1574 if (flag_cx_fortran_rules)
1575 flag_complex_method = 1;
1577 /* Targets must be able to place spill slots at lower addresses. If the
1578 target already uses a soft frame pointer, the transition is trivial. */
1579 if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
1581 warning (0, "-fstack-protector not supported for this target");
1582 flag_stack_protect = 0;
1584 if (!flag_stack_protect)
1585 warn_stack_protect = 0;
1587 /* ??? Unwind info is not correct around the CFG unless either a frame
1588 pointer is present or A_O_A is set. Fixing this requires rewriting
1589 unwind info generation to be aware of the CFG and propagating states
1591 if (flag_unwind_tables && !ACCUMULATE_OUTGOING_ARGS
1592 && flag_omit_frame_pointer)
1594 warning (0, "unwind tables currently require a frame pointer "
1596 flag_omit_frame_pointer = 0;
1599 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1600 have not been set. */
1601 if (!global_options_set.x_warnings_are_errors
1602 && warn_coverage_mismatch
1603 && (global_dc->classify_diagnostic[OPT_Wcoverage_mismatch] ==
1605 diagnostic_classify_diagnostic (global_dc, OPT_Wcoverage_mismatch,
1606 DK_ERROR, UNKNOWN_LOCATION);
1608 /* Save the current optimization options. */
1609 optimization_default_node = build_optimization_node ();
1610 optimization_current_node = optimization_default_node;
1613 /* This function can be called multiple times to reinitialize the compiler
1614 back end when register classes or instruction sets have changed,
1615 before each function. */
1617 backend_init_target (void)
1619 /* Initialize alignment variables. */
1622 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
1623 to initialize reg_raw_mode[]. */
1626 /* This invokes target hooks to set fixed_reg[] etc, which is
1630 /* This depends on stack_pointer_rtx. */
1631 init_fake_stack_mems ();
1633 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1635 init_alias_target ();
1637 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1640 /* The following initialization functions need to generate rtl, so
1641 provide a dummy function context for them. */
1642 init_dummy_function_start ();
1644 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1645 on a mode change. */
1648 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1649 after a mode change as well. */
1650 caller_save_initialized_p = false;
1652 expand_dummy_function_end ();
1655 /* Initialize the compiler back end. This function is called only once,
1656 when starting the compiler. */
1663 init_inline_once ();
1664 init_varasm_once ();
1665 save_register_info ();
1667 /* Initialize the target-specific back end pieces. */
1669 backend_init_target ();
1672 /* Initialize excess precision settings. */
1674 init_excess_precision (void)
1676 /* Adjust excess precision handling based on the target options. If
1677 the front end cannot handle it, flag_excess_precision_cmdline
1678 will already have been set accordingly in the post_options
1680 gcc_assert (flag_excess_precision_cmdline != EXCESS_PRECISION_DEFAULT);
1681 flag_excess_precision = flag_excess_precision_cmdline;
1682 if (flag_unsafe_math_optimizations)
1683 flag_excess_precision = EXCESS_PRECISION_FAST;
1684 if (flag_excess_precision == EXCESS_PRECISION_STANDARD)
1686 int flt_eval_method = TARGET_FLT_EVAL_METHOD;
1687 switch (flt_eval_method)
1691 /* Either the target acts unpredictably (-1) or has all the
1692 operations required not to have excess precision (0). */
1693 flag_excess_precision = EXCESS_PRECISION_FAST;
1697 /* In these cases, predictable excess precision makes
1701 /* Any other implementation-defined FLT_EVAL_METHOD values
1702 require the compiler to handle the associated excess
1703 precision rules in excess_precision_type. */
1709 /* Initialize things that are both lang-dependent and target-dependent.
1710 This function can be called more than once if target parameters change. */
1712 lang_dependent_init_target (void)
1714 /* This determines excess precision settings. */
1715 init_excess_precision ();
1717 /* This creates various _DECL nodes, so needs to be called after the
1718 front end is initialized. It also depends on the HAVE_xxx macros
1719 generated from the target machine description. */
1722 /* The following initialization functions need to generate rtl, so
1723 provide a dummy function context for them. */
1724 init_dummy_function_start ();
1726 /* Do the target-specific parts of expr initialization. */
1727 init_expr_target ();
1729 /* Although the actions of these functions are language-independent,
1730 they use optabs, so we cannot call them from backend_init. */
1734 expand_dummy_function_end ();
1737 /* Language-dependent initialization. Returns nonzero on success. */
1739 lang_dependent_init (const char *name)
1741 location_t save_loc = input_location;
1742 if (dump_base_name == 0)
1743 dump_base_name = name && name[0] ? name : "gccdump";
1745 /* Other front-end initialization. */
1746 input_location = BUILTINS_LOCATION;
1747 if (lang_hooks.init () == 0)
1749 input_location = save_loc;
1753 init_asm_output (name);
1755 /* If stack usage information is desired, open the output file. */
1756 if (flag_stack_usage)
1757 stack_usage_file = open_auxiliary_file ("su");
1760 /* This creates various _DECL nodes, so needs to be called after the
1761 front end is initialized. */
1764 /* Do the target-specific parts of the initialization. */
1765 lang_dependent_init_target ();
1769 /* If dbx symbol table desired, initialize writing it and output the
1770 predefined types. */
1771 timevar_push (TV_SYMOUT);
1773 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
1774 if (dwarf2out_do_frame ())
1775 dwarf2out_frame_init ();
1778 /* Now we have the correct original filename, we can initialize
1780 (*debug_hooks->init) (name);
1782 timevar_pop (TV_SYMOUT);
1789 /* Reinitialize everything when target parameters, such as register usage,
1792 target_reinit (void)
1794 struct rtl_data saved_x_rtl;
1795 rtx *saved_regno_reg_rtx;
1797 /* Save *crtl and regno_reg_rtx around the reinitialization
1798 to allow target_reinit being called even after prepare_function_start. */
1799 saved_regno_reg_rtx = regno_reg_rtx;
1800 if (saved_regno_reg_rtx)
1802 saved_x_rtl = *crtl;
1803 memset (crtl, '\0', sizeof (*crtl));
1804 regno_reg_rtx = NULL;
1807 /* Reinitialize RTL backend. */
1808 backend_init_target ();
1810 /* Reinitialize lang-dependent parts. */
1811 lang_dependent_init_target ();
1813 /* And restore it at the end, as free_after_compilation from
1814 expand_dummy_function_end clears it. */
1815 if (saved_regno_reg_rtx)
1817 *crtl = saved_x_rtl;
1818 regno_reg_rtx = saved_regno_reg_rtx;
1819 saved_regno_reg_rtx = NULL;
1824 dump_memory_report (bool final)
1826 ggc_print_statistics ();
1827 stringpool_statistics ();
1828 dump_tree_statistics ();
1829 dump_gimple_statistics ();
1830 dump_rtx_statistics ();
1831 dump_alloc_pool_statistics ();
1832 dump_bitmap_statistics ();
1833 dump_vec_loc_statistics ();
1834 dump_ggc_loc_statistics (final);
1835 dump_alias_stats (stderr);
1836 dump_pta_stats (stderr);
1839 /* Clean up: close opened files, etc. */
1842 finalize (bool no_backend)
1844 /* Close the dump files. */
1845 if (flag_gen_aux_info)
1847 fclose (aux_info_file);
1849 unlink (aux_info_file_name);
1852 /* Close non-debugging input and output files. Take special care to note
1853 whether fclose returns an error, since the pages might still be on the
1854 buffer chain while the file is open. */
1858 if (ferror (asm_out_file) != 0)
1859 fatal_error ("error writing to %s: %m", asm_file_name);
1860 if (fclose (asm_out_file) != 0)
1861 fatal_error ("error closing %s: %m", asm_file_name);
1864 if (stack_usage_file)
1865 fclose (stack_usage_file);
1871 finish_optimization_passes ();
1877 dump_memory_report (true);
1879 /* Language-specific end of compilation actions. */
1880 lang_hooks.finish ();
1883 /* Initialize the compiler, and compile the input file. */
1887 /* Initialize timing first. The C front ends read the main file in
1888 the post_options hook, and C++ does file timings. */
1889 if (time_report || !quiet_flag || flag_detailed_statistics)
1891 timevar_start (TV_TOTAL);
1895 /* Don't do any more if an error has already occurred. */
1898 timevar_start (TV_PHASE_SETUP);
1900 /* This must be run always, because it is needed to compute the FP
1901 predefined macros, such as __LDBL_MAX__, for targets using non
1902 default FP formats. */
1903 init_adjust_machine_modes ();
1905 /* Set up the back-end if requested. */
1909 /* Language-dependent initialization. Returns true on success. */
1910 if (lang_dependent_init (main_input_filename))
1912 /* Initialize yet another pass. */
1914 ggc_protect_identifiers = true;
1917 init_final (main_input_filename);
1918 coverage_init (aux_base_name);
1920 invoke_plugin_callbacks (PLUGIN_START_UNIT, NULL);
1922 timevar_stop (TV_PHASE_SETUP);
1928 timevar_stop (TV_PHASE_SETUP);
1931 timevar_start (TV_PHASE_FINALIZE);
1933 finalize (no_backend);
1935 timevar_stop (TV_PHASE_FINALIZE);
1938 /* Stop timing and print the times. */
1939 timevar_stop (TV_TOTAL);
1940 timevar_print (stderr);
1943 /* Entry point of cc1, cc1plus, jc1, f771, etc.
1944 Exit code is FATAL_EXIT_CODE if can't open files or if there were
1945 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
1947 It is not safe to call this function more than once. */
1950 toplev_main (int argc, char **argv)
1952 expandargv (&argc, &argv);
1954 /* Initialization of GCC's environment, and diagnostics. */
1955 general_init (argv[0]);
1957 /* One-off initialization of options that does not need to be
1958 repeated when options are added for particular functions. */
1959 init_options_once ();
1961 /* Initialize global options structures; this must be repeated for
1962 each structure used for parsing options. */
1963 init_options_struct (&global_options, &global_options_set);
1964 lang_hooks.init_options_struct (&global_options);
1966 /* Convert the options to an array. */
1967 decode_cmdline_options_to_array_default_mask (argc,
1968 CONST_CAST2 (const char **,
1970 &save_decoded_options,
1971 &save_decoded_options_count);
1973 /* Perform language-specific options initialization. */
1974 lang_hooks.init_options (save_decoded_options_count, save_decoded_options);
1976 /* Parse the options and do minimal processing; basically just
1977 enough to default flags appropriately. */
1978 decode_options (&global_options, &global_options_set,
1979 save_decoded_options, save_decoded_options_count,
1980 UNKNOWN_LOCATION, global_dc);
1982 handle_common_deferred_options ();
1986 initialize_plugins ();
1989 print_version (stderr, "");
1992 print_plugins_help (stderr, "");
1994 /* Exit early if we can (e.g. -help). */
1995 if (!exit_after_options)
1998 if (warningcount || errorcount)
1999 print_ignored_options ();
2000 diagnostic_finish (global_dc);
2002 /* Invoke registered plugin callbacks if any. */
2003 invoke_plugin_callbacks (PLUGIN_FINISH, NULL);
2005 finalize_plugins ();
2007 return (FATAL_EXIT_CODE);
2009 return (SUCCESS_EXIT_CODE);