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 /* The FUNCTION_DECL for the function currently being compiled,
129 or 0 if between functions. */
130 tree current_function_decl;
132 /* Set to the FUNC_BEGIN label of the current function, or NULL
134 const char * current_function_func_begin_label;
136 /* A random sequence of characters, unless overridden by user. */
137 static const char *flag_random_seed;
139 /* A local time stamp derived from the time of compilation. It will be
140 zero if the system cannot provide a time. It will be -1u, if the
141 user has specified a particular random seed. */
144 /* Random number for this compilation */
145 HOST_WIDE_INT random_seed;
149 /* Generate code for GNU or NeXT Objective-C runtime environment. */
151 #ifdef NEXT_OBJC_RUNTIME
152 int flag_next_runtime = 1;
154 int flag_next_runtime = 0;
157 /* Nonzero means make permerror produce warnings instead of errors. */
159 int flag_permissive = 0;
161 /* When non-NULL, indicates that whenever space is allocated on the
162 stack, the resulting stack pointer must not pass this
163 address---that is, for stacks that grow downward, the stack pointer
164 must always be greater than or equal to this address; for stacks
165 that grow upward, the stack pointer must be less than this address.
166 At present, the rtx may be either a REG or a SYMBOL_REF, although
167 the support provided depends on the backend. */
170 /* True if the user has tagged the function with the 'section'
173 bool user_defined_section_attribute = false;
175 struct target_flag_state default_target_flag_state;
176 #if SWITCHABLE_TARGET
177 struct target_flag_state *this_target_flag_state = &default_target_flag_state;
179 #define this_target_flag_state (&default_target_flag_state)
182 /* The user symbol prefix after having resolved same. */
183 const char *user_label_prefix;
185 /* Output files for assembler code (real compiler output)
186 and debugging dumps. */
190 FILE *stack_usage_file = NULL;
191 FILE *dump_file = NULL;
192 const char *dump_file_name;
194 /* The current working directory of a translation. It's generally the
195 directory from which compilation was initiated, but a preprocessed
196 file may specify the original directory in which it was
199 static const char *src_pwd;
201 /* Initialize src_pwd with the given string, and return true. If it
202 was already initialized, return false. As a special case, it may
203 be called with a NULL argument to test whether src_pwd has NOT been
207 set_src_pwd (const char *pwd)
211 if (strcmp (src_pwd, pwd) == 0)
217 src_pwd = xstrdup (pwd);
221 /* Return the directory from which the translation unit was initiated,
222 in case set_src_pwd() was not called before to assign it a
238 /* Called when the start of a function definition is parsed,
239 this function prints on stderr the name of the function. */
241 announce_function (tree decl)
245 if (rtl_dump_and_exit)
246 fprintf (stderr, "%s ",
247 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl))));
249 fprintf (stderr, " %s",
250 identifier_to_locale (lang_hooks.decl_printable_name (decl, 2)));
252 pp_needs_newline (global_dc->printer) = true;
253 diagnostic_set_last_function (global_dc, (diagnostic_info *) NULL);
257 /* Initialize local_tick with a random number or -1 if
258 flag_random_seed is set. */
261 init_local_tick (void)
263 if (!flag_random_seed)
265 /* Try urandom first. Time of day is too likely to collide.
266 In case of any error we just use the local tick. */
268 int fd = open ("/dev/urandom", O_RDONLY);
271 read (fd, &random_seed, sizeof (random_seed));
275 /* Now get the tick anyways */
276 #ifdef HAVE_GETTIMEOFDAY
280 gettimeofday (&tv, NULL);
281 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
285 time_t now = time (NULL);
287 if (now != (time_t)-1)
288 local_tick = (unsigned) now;
296 /* Set up a default flag_random_seed and local_tick, unless the user
297 already specified one. Must be called after init_local_tick. */
300 init_random_seed (void)
302 if (flag_random_seed)
306 /* When the driver passed in a hex number don't crc it again */
307 random_seed = strtoul (flag_random_seed, &endp, 0);
308 if (!(endp > flag_random_seed && *endp == 0))
309 random_seed = crc32_string (0, flag_random_seed);
311 else if (!random_seed)
312 random_seed = local_tick ^ getpid (); /* Old racey fallback method */
315 /* Obtain the random_seed. Unless NOINIT, initialize it if
316 it's not provided in the command line. */
319 get_random_seed (bool noinit)
321 if (!flag_random_seed && !noinit)
326 /* Modify the random_seed string to VAL. Return its previous
330 set_random_seed (const char *val)
332 const char *old = flag_random_seed;
333 flag_random_seed = val;
337 /* Handler for fatal signals, such as SIGSEGV. These are transformed
338 into ICE messages, which is much more user friendly. In case the
339 error printer crashes, reset the signal to prevent infinite recursion. */
342 crash_signal (int signo)
344 signal (signo, SIG_DFL);
346 /* If we crashed while processing an ASM statement, then be a little more
347 graceful. It's most likely the user's fault. */
348 if (this_is_asm_operands)
350 output_operand_lossage ("unrecoverable error");
351 exit (FATAL_EXIT_CODE);
354 internal_error ("%s", strsignal (signo));
357 /* A subroutine of wrapup_global_declarations. We've come to the end of
358 the compilation unit. All deferred variables should be undeferred,
359 and all incomplete decls should be finalized. */
362 wrapup_global_declaration_1 (tree decl)
364 /* We're not deferring this any longer. Assignment is conditional to
365 avoid needlessly dirtying PCH pages. */
366 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl), TS_DECL_WITH_VIS)
367 && DECL_DEFER_OUTPUT (decl) != 0)
368 DECL_DEFER_OUTPUT (decl) = 0;
370 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
371 lang_hooks.finish_incomplete_decl (decl);
374 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
375 needs to be output. Return true if it is output. */
378 wrapup_global_declaration_2 (tree decl)
380 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
383 /* Don't write out static consts, unless we still need them.
385 We also keep static consts if not optimizing (for debugging),
386 unless the user specified -fno-keep-static-consts.
387 ??? They might be better written into the debug information.
388 This is possible when using DWARF.
390 A language processor that wants static constants to be always
391 written out (even if it is not used) is responsible for
392 calling rest_of_decl_compilation itself. E.g. the C front-end
393 calls rest_of_decl_compilation from finish_decl.
394 One motivation for this is that is conventional in some
395 environments to write things like:
396 static const char rcsid[] = "... version string ...";
397 intending to force the string to be in the executable.
399 A language processor that would prefer to have unneeded
400 static constants "optimized away" would just defer writing
401 them out until here. E.g. C++ does this, because static
402 constants are often defined in header files.
404 ??? A tempting alternative (for both C and C++) would be
405 to force a constant to be written if and only if it is
406 defined in a main file, as opposed to an include file. */
408 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
410 struct varpool_node *node;
412 node = varpool_get_node (decl);
414 if (!node && flag_ltrans)
416 else if (node && node->finalized)
418 else if (node && node->alias)
420 else if (!cgraph_global_info_ready
422 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
424 else if (node && node->needed)
426 else if (DECL_COMDAT (decl))
428 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
429 && (optimize || !flag_keep_static_consts
430 || DECL_ARTIFICIAL (decl)))
435 rest_of_decl_compilation (decl, 1, 1);
443 /* Do any final processing required for the declarations in VEC, of
444 which there are LEN. We write out inline functions and variables
445 that have been deferred until this point, but which are required.
446 Returns nonzero if anything was put out. */
449 wrapup_global_declarations (tree *vec, int len)
451 bool reconsider, output_something = false;
454 for (i = 0; i < len; i++)
455 wrapup_global_declaration_1 (vec[i]);
457 /* Now emit any global variables or functions that we have been
458 putting off. We need to loop in case one of the things emitted
459 here references another one which comes earlier in the list. */
463 for (i = 0; i < len; i++)
464 reconsider |= wrapup_global_declaration_2 (vec[i]);
466 output_something = true;
470 return output_something;
473 /* A subroutine of check_global_declarations. Issue appropriate warnings
474 for the global declaration DECL. */
477 check_global_declaration_1 (tree decl)
479 /* Warn about any function declared static but not defined. We don't
480 warn about variables, because many programs have static variables
481 that exist only to get some text into the object file. */
482 if (TREE_CODE (decl) == FUNCTION_DECL
483 && DECL_INITIAL (decl) == 0
484 && DECL_EXTERNAL (decl)
485 && ! DECL_ARTIFICIAL (decl)
486 && ! TREE_NO_WARNING (decl)
487 && ! TREE_PUBLIC (decl)
488 && (warn_unused_function
489 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
491 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
492 pedwarn (input_location, 0, "%q+F used but never defined", decl);
494 warning (OPT_Wunused_function, "%q+F declared %<static%> but never defined", decl);
495 /* This symbol is effectively an "extern" declaration now. */
496 TREE_PUBLIC (decl) = 1;
497 assemble_external (decl);
500 /* Warn about static fns or vars defined but not used. */
501 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
502 /* We don't warn about "static const" variables because the
503 "rcs_id" idiom uses that construction. */
504 || (warn_unused_variable
505 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
506 && ! DECL_IN_SYSTEM_HEADER (decl)
507 && ! TREE_USED (decl)
508 /* The TREE_USED bit for file-scope decls is kept in the identifier,
509 to handle multiple external decls in different scopes. */
510 && ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl)))
511 && ! DECL_EXTERNAL (decl)
512 && ! TREE_PUBLIC (decl)
513 /* A volatile variable might be used in some non-obvious way. */
514 && ! TREE_THIS_VOLATILE (decl)
515 /* Global register variables must be declared to reserve them. */
516 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
517 /* Otherwise, ask the language. */
518 && lang_hooks.decls.warn_unused_global (decl))
519 warning ((TREE_CODE (decl) == FUNCTION_DECL)
520 ? OPT_Wunused_function
521 : OPT_Wunused_variable,
522 "%q+D defined but not used", decl);
525 /* Issue appropriate warnings for the global declarations in VEC (of
526 which there are LEN). */
529 check_global_declarations (tree *vec, int len)
533 for (i = 0; i < len; i++)
534 check_global_declaration_1 (vec[i]);
537 /* Emit debugging information for all global declarations in VEC. */
540 emit_debug_global_declarations (tree *vec, int len)
544 /* Avoid confusing the debug information machinery when there are errors. */
548 timevar_push (TV_SYMOUT);
549 for (i = 0; i < len; i++)
550 debug_hooks->global_decl (vec[i]);
551 timevar_pop (TV_SYMOUT);
554 /* Compile an entire translation unit. Write a file of assembly
555 output and various debugging dumps. */
560 timevar_start (TV_PHASE_PARSING);
561 timevar_push (TV_PARSE_GLOBAL);
563 /* Call the parser, which parses the entire file (calling
564 rest_of_compilation for each function). */
565 lang_hooks.parse_file ();
567 timevar_pop (TV_PARSE_GLOBAL);
568 timevar_stop (TV_PHASE_PARSING);
570 /* Compilation is now finished except for writing
571 what's left of the symbol table output. */
573 if (flag_syntax_only || flag_wpa)
576 timevar_start (TV_PHASE_GENERATE);
578 ggc_protect_identifiers = false;
580 /* This must also call cgraph_finalize_compilation_unit. */
581 lang_hooks.decls.final_write_globals ();
585 timevar_stop (TV_PHASE_GENERATE);
589 /* Compilation unit is finalized. When producing non-fat LTO object, we are
590 basically finished. */
591 if (in_lto_p || !flag_lto || flag_fat_lto_objects)
593 varpool_assemble_pending_decls ();
596 /* Likewise for mudflap static object registrations. */
598 mudflap_finish_file ();
600 output_shared_constant_pool ();
601 output_object_blocks ();
603 /* Write out any pending weak symbol declarations. */
606 /* This must be at the end before unwind and debug info.
607 Some target ports emit PIC setup thunks here. */
608 targetm.asm_out.code_end ();
610 /* Do dbx symbols. */
611 timevar_push (TV_SYMOUT);
613 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
614 if (dwarf2out_do_frame ())
615 dwarf2out_frame_finish ();
618 (*debug_hooks->finish) (main_input_filename);
619 timevar_pop (TV_SYMOUT);
621 /* Output some stuff at end of file if nec. */
623 dw2_output_indirect_constants ();
625 /* Flush any pending external directives. */
626 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);
648 /* Let linker plugin know that this is a slim object and must be LTOed
649 even when user did not ask for it. */
650 if (!flag_fat_lto_objects)
652 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
653 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
655 (unsigned HOST_WIDE_INT) 1, 8);
656 #elif defined ASM_OUTPUT_ALIGNED_COMMON
657 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_slim",
658 (unsigned HOST_WIDE_INT) 1, 8);
660 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_slim",
661 (unsigned HOST_WIDE_INT) 1,
662 (unsigned HOST_WIDE_INT) 1);
667 /* Attach a special .ident directive to the end of the file to identify
668 the version of GCC which compiled this code. The format of the .ident
669 string is patterned after the ones produced by native SVR4 compilers. */
673 const char *pkg_version = "(GNU) ";
675 if (strcmp ("(GCC) ", pkgversion_string))
676 pkg_version = pkgversion_string;
677 fprintf (asm_out_file, "%s\"GCC: %s%s\"\n",
678 IDENT_ASM_OP, pkg_version, version_string);
682 /* Invoke registered plugin callbacks. */
683 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT, NULL);
685 /* This must be at the end. Some target ports emit end of file directives
686 into the assembly file here, and hence we can not output anything to the
687 assembly file after this point. */
688 targetm.asm_out.file_end ();
690 timevar_stop (TV_PHASE_GENERATE);
693 /* Print version information to FILE.
694 Each line begins with INDENT (for the case where FILE is the
695 assembler output file). */
698 print_version (FILE *file, const char *indent)
700 static const char fmt1[] =
702 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
704 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
707 static const char fmt2[] =
708 N_("GMP version %s, MPFR version %s, MPC version %s\n");
709 static const char fmt3[] =
710 N_("%s%swarning: %s header version %s differs from library version %s.\n");
711 static const char fmt4[] =
712 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
714 #define __VERSION__ "[?]"
717 file == stderr ? _(fmt1) : fmt1,
718 indent, *indent != 0 ? " " : "",
719 lang_hooks.name, pkgversion_string, version_string, TARGET_NAME,
720 indent, __VERSION__);
722 /* We need to stringify the GMP macro values. Ugh, gmp_version has
723 two string formats, "i.j.k" and "i.j" when k is zero. As of
724 gmp-4.3.0, GMP always uses the 3 number format. */
725 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
726 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3(X)
727 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
728 #define GCC_GMP_VERSION \
729 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
730 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
731 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
732 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR)
734 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
735 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) "." \
736 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_PATCHLEVEL)
739 file == stderr ? _(fmt2) : fmt2,
740 GCC_GMP_STRINGIFY_VERSION, MPFR_VERSION_STRING, MPC_VERSION_STRING);
741 if (strcmp (GCC_GMP_STRINGIFY_VERSION, gmp_version))
743 file == stderr ? _(fmt3) : fmt3,
744 indent, *indent != 0 ? " " : "",
745 "GMP", GCC_GMP_STRINGIFY_VERSION, gmp_version);
746 if (strcmp (MPFR_VERSION_STRING, mpfr_get_version ()))
748 file == stderr ? _(fmt3) : fmt3,
749 indent, *indent != 0 ? " " : "",
750 "MPFR", MPFR_VERSION_STRING, mpfr_get_version ());
751 if (strcmp (MPC_VERSION_STRING, mpc_get_version ()))
753 file == stderr ? _(fmt3) : fmt3,
754 indent, *indent != 0 ? " " : "",
755 "MPC", MPC_VERSION_STRING, mpc_get_version ());
757 file == stderr ? _(fmt4) : fmt4,
758 indent, *indent != 0 ? " " : "",
759 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
761 print_plugins_versions (file, indent);
765 print_to_asm_out_file (print_switch_type type, const char * text)
767 bool prepend_sep = true;
771 case SWITCH_TYPE_LINE_END:
772 putc ('\n', asm_out_file);
775 case SWITCH_TYPE_LINE_START:
776 fputs (ASM_COMMENT_START, asm_out_file);
777 return strlen (ASM_COMMENT_START);
779 case SWITCH_TYPE_DESCRIPTIVE:
780 if (ASM_COMMENT_START[0] == 0)
783 case SWITCH_TYPE_PASSED:
784 case SWITCH_TYPE_ENABLED:
786 fputc (' ', asm_out_file);
787 fputs (text, asm_out_file);
788 /* No need to return the length here as
789 print_single_switch has already done it. */
798 print_to_stderr (print_switch_type type, const char * text)
802 case SWITCH_TYPE_LINE_END:
806 case SWITCH_TYPE_LINE_START:
809 case SWITCH_TYPE_PASSED:
810 case SWITCH_TYPE_ENABLED:
814 case SWITCH_TYPE_DESCRIPTIVE:
815 fputs (text, stderr);
816 /* No need to return the length here as
817 print_single_switch has already done it. */
825 /* Print an option value and return the adjusted position in the line.
826 ??? print_fn doesn't handle errors, eg disk full; presumably other
827 code will catch a disk full though. */
830 print_single_switch (print_switch_fn_type print_fn,
832 print_switch_type type,
835 /* The ultrix fprintf returns 0 on success, so compute the result
836 we want here since we need it for the following test. The +1
837 is for the separator character that will probably be emitted. */
838 int len = strlen (text) + 1;
841 && pos + len > MAX_LINE)
843 print_fn (SWITCH_TYPE_LINE_END, NULL);
848 pos += print_fn (SWITCH_TYPE_LINE_START, NULL);
850 print_fn (type, text);
854 /* Print active target switches using PRINT_FN.
855 POS is the current cursor position and MAX is the size of a "line".
856 Each line begins with INDENT and ends with TERM.
857 Each switch is separated from the next by SEP. */
860 print_switch_values (print_switch_fn_type print_fn)
865 /* Fill in the -frandom-seed option, if the user didn't pass it, so
866 that it can be printed below. This helps reproducibility. */
867 if (!flag_random_seed)
870 /* Print the options as passed. */
871 pos = print_single_switch (print_fn, pos,
872 SWITCH_TYPE_DESCRIPTIVE, _("options passed: "));
874 for (j = 1; j < save_decoded_options_count; j++)
876 switch (save_decoded_options[j].opt_index)
889 pos = print_single_switch (print_fn, pos, SWITCH_TYPE_PASSED,
890 save_decoded_options[j].orig_option_with_args_text);
894 print_fn (SWITCH_TYPE_LINE_END, NULL);
896 /* Print the -f and -m options that have been enabled.
897 We don't handle language specific options but printing argv
899 pos = print_single_switch (print_fn, 0,
900 SWITCH_TYPE_DESCRIPTIVE, _("options enabled: "));
902 for (j = 0; j < cl_options_count; j++)
903 if (cl_options[j].cl_report
904 && option_enabled (j, &global_options) > 0)
905 pos = print_single_switch (print_fn, pos,
906 SWITCH_TYPE_ENABLED, cl_options[j].opt_text);
908 print_fn (SWITCH_TYPE_LINE_END, NULL);
911 /* Open assembly code output file. Do this even if -fsyntax-only is
912 on, because then the driver will have provided the name of a
913 temporary file or bit bucket for us. NAME is the file specified on
914 the command line, possibly NULL. */
916 init_asm_output (const char *name)
918 if (name == NULL && asm_file_name == 0)
919 asm_out_file = stdout;
922 if (asm_file_name == 0)
924 int len = strlen (dump_base_name);
925 char *dumpname = XNEWVEC (char, len + 6);
927 memcpy (dumpname, dump_base_name, len + 1);
928 strip_off_ending (dumpname, len);
929 strcat (dumpname, ".s");
930 asm_file_name = dumpname;
932 if (!strcmp (asm_file_name, "-"))
933 asm_out_file = stdout;
935 asm_out_file = fopen (asm_file_name, "w+b");
936 if (asm_out_file == 0)
937 fatal_error ("can%'t open %s for writing: %m", asm_file_name);
940 if (!flag_syntax_only)
942 targetm.asm_out.file_start ();
944 if (flag_record_gcc_switches)
946 if (targetm.asm_out.record_gcc_switches)
948 /* Let the target know that we are about to start recording. */
949 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
951 /* Now record the switches. */
952 print_switch_values (targetm.asm_out.record_gcc_switches);
953 /* Let the target know that the recording is over. */
954 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
958 inform (input_location, "-frecord-gcc-switches is not supported by the current target");
961 if (flag_verbose_asm)
963 /* Print the list of switches in effect
964 into the assembler file as comments. */
965 print_version (asm_out_file, ASM_COMMENT_START);
966 print_switch_values (print_to_asm_out_file);
967 putc ('\n', asm_out_file);
972 /* Default tree printer. Handles declarations only. */
974 default_tree_printer (pretty_printer *pp, text_info *text, const char *spec,
975 int precision, bool wide, bool set_locus, bool hash)
979 /* FUTURE: %+x should set the locus. */
980 if (precision != 0 || wide || hash)
986 t = va_arg (*text->args_ptr, tree);
987 if (TREE_CODE (t) == IDENTIFIER_NODE)
989 pp_identifier (pp, IDENTIFIER_POINTER (t));
995 t = va_arg (*text->args_ptr, tree);
996 if (DECL_DEBUG_EXPR_IS_FROM (t) && DECL_DEBUG_EXPR (t))
997 t = DECL_DEBUG_EXPR (t);
1002 t = va_arg (*text->args_ptr, tree);
1006 percent_K_format (text);
1013 if (set_locus && text->locus)
1014 *text->locus = DECL_SOURCE_LOCATION (t);
1018 const char *n = DECL_NAME (t)
1019 ? identifier_to_locale (lang_hooks.decl_printable_name (t, 2))
1024 dump_generic_node (pp, t, 0, TDF_DIAGNOSTIC, 0);
1029 /* A helper function; used as the reallocator function for cpp's line
1032 realloc_for_line_map (void *ptr, size_t len)
1034 return GGC_RESIZEVAR (void, ptr, len);
1037 /* A helper function: used as the allocator function for
1038 identifier_to_locale. */
1040 alloc_for_identifier_to_locale (size_t len)
1042 return ggc_alloc_atomic (len);
1045 /* Output stack usage information. */
1047 output_stack_usage (void)
1049 static bool warning_issued = false;
1050 enum stack_usage_kind_type { STATIC = 0, DYNAMIC, DYNAMIC_BOUNDED };
1051 const char *stack_usage_kind_str[] = {
1056 HOST_WIDE_INT stack_usage = current_function_static_stack_size;
1057 enum stack_usage_kind_type stack_usage_kind;
1059 if (stack_usage < 0)
1061 if (!warning_issued)
1063 warning (0, "stack usage computation not supported for this target");
1064 warning_issued = true;
1069 stack_usage_kind = STATIC;
1071 /* Add the maximum amount of space pushed onto the stack. */
1072 if (current_function_pushed_stack_size > 0)
1074 stack_usage += current_function_pushed_stack_size;
1075 stack_usage_kind = DYNAMIC_BOUNDED;
1078 /* Now on to the tricky part: dynamic stack allocation. */
1079 if (current_function_allocates_dynamic_stack_space)
1081 if (current_function_has_unbounded_dynamic_stack_size)
1082 stack_usage_kind = DYNAMIC;
1084 stack_usage_kind = DYNAMIC_BOUNDED;
1086 /* Add the size even in the unbounded case, this can't hurt. */
1087 stack_usage += current_function_dynamic_stack_size;
1090 if (flag_stack_usage)
1092 expanded_location loc
1093 = expand_location (DECL_SOURCE_LOCATION (current_function_decl));
1094 const char *raw_id, *id;
1096 /* Strip the scope prefix if any. */
1097 raw_id = lang_hooks.decl_printable_name (current_function_decl, 2);
1098 id = strrchr (raw_id, '.');
1104 fprintf (stack_usage_file,
1105 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC"\t%s\n",
1106 lbasename (loc.file),
1111 stack_usage_kind_str[stack_usage_kind]);
1114 if (warn_stack_usage >= 0)
1116 if (stack_usage_kind == DYNAMIC)
1117 warning (OPT_Wstack_usage_, "stack usage might be unbounded");
1118 else if (stack_usage > warn_stack_usage)
1120 if (stack_usage_kind == DYNAMIC_BOUNDED)
1121 warning (OPT_Wstack_usage_, "stack usage might be %wd bytes",
1124 warning (OPT_Wstack_usage_, "stack usage is %wd bytes",
1130 /* Open an auxiliary output file. */
1132 open_auxiliary_file (const char *ext)
1137 filename = concat (aux_base_name, ".", ext, NULL);
1138 file = fopen (filename, "w");
1140 fatal_error ("can%'t open %s for writing: %m", filename);
1145 /* Initialization of the front end environment, before command line
1146 options are parsed. Signal handlers, internationalization etc.
1147 ARGV0 is main's argv[0]. */
1149 general_init (const char *argv0)
1153 p = argv0 + strlen (argv0);
1154 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1158 xmalloc_set_program_name (progname);
1162 /* Unlock the stdio streams. */
1163 unlock_std_streams ();
1165 gcc_init_libintl ();
1167 identifier_to_locale_alloc = alloc_for_identifier_to_locale;
1168 identifier_to_locale_free = ggc_free;
1170 /* Initialize the diagnostics reporting machinery, so option parsing
1171 can give warnings and errors. */
1172 diagnostic_initialize (global_dc, N_OPTS);
1173 diagnostic_starter (global_dc) = default_tree_diagnostic_starter;
1174 /* By default print macro expansion contexts in the diagnostic
1175 finalizer -- for tokens resulting from macro macro expansion. */
1176 diagnostic_finalizer (global_dc) = virt_loc_aware_diagnostic_finalizer;
1177 /* Set a default printer. Language specific initializations will
1178 override it later. */
1179 pp_format_decoder (global_dc->printer) = &default_tree_printer;
1180 global_dc->show_option_requested
1181 = global_options_init.x_flag_diagnostics_show_option;
1182 global_dc->show_column
1183 = global_options_init.x_flag_show_column;
1184 global_dc->internal_error = plugins_internal_error_function;
1185 global_dc->option_enabled = option_enabled;
1186 global_dc->option_state = &global_options;
1187 global_dc->option_name = option_name;
1189 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1191 signal (SIGSEGV, crash_signal);
1194 signal (SIGILL, crash_signal);
1197 signal (SIGBUS, crash_signal);
1200 signal (SIGABRT, crash_signal);
1202 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1203 signal (SIGIOT, crash_signal);
1206 signal (SIGFPE, crash_signal);
1209 /* Other host-specific signal setup. */
1210 (*host_hooks.extra_signals)();
1212 /* Initialize the garbage-collector, string pools and tree type hash
1216 line_table = ggc_alloc_line_maps ();
1217 linemap_init (line_table);
1218 line_table->reallocator = realloc_for_line_map;
1221 /* Initialize register usage now so switches may override. */
1224 /* Register the language-independent parameters. */
1225 global_init_params ();
1227 /* This must be done after global_init_params but before argument
1229 init_ggc_heuristics();
1230 init_optimization_passes ();
1231 statistics_early_init ();
1235 /* Return true if the current target supports -fsection-anchors. */
1238 target_supports_section_anchors_p (void)
1240 if (targetm.min_anchor_offset == 0 && targetm.max_anchor_offset == 0)
1243 if (targetm.asm_out.output_anchor == NULL)
1249 /* Default the align_* variables to 1 if they're still unset, and
1250 set up the align_*_log variables. */
1252 init_alignments (void)
1254 if (align_loops <= 0)
1256 if (align_loops_max_skip > align_loops)
1257 align_loops_max_skip = align_loops - 1;
1258 align_loops_log = floor_log2 (align_loops * 2 - 1);
1259 if (align_jumps <= 0)
1261 if (align_jumps_max_skip > align_jumps)
1262 align_jumps_max_skip = align_jumps - 1;
1263 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1264 if (align_labels <= 0)
1266 align_labels_log = floor_log2 (align_labels * 2 - 1);
1267 if (align_labels_max_skip > align_labels)
1268 align_labels_max_skip = align_labels - 1;
1269 if (align_functions <= 0)
1270 align_functions = 1;
1271 align_functions_log = floor_log2 (align_functions * 2 - 1);
1274 /* Process the options that have been parsed. */
1276 process_options (void)
1278 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1279 This can happen with incorrect pre-processed input. */
1280 debug_hooks = &do_nothing_debug_hooks;
1282 maximum_field_alignment = initial_max_fld_align * BITS_PER_UNIT;
1284 /* Allow the front end to perform consistency checks and do further
1285 initialization based on the command line options. This hook also
1286 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1287 so we can correctly initialize debug output. */
1288 no_backend = lang_hooks.post_options (&main_input_filename);
1290 /* Some machines may reject certain combinations of options. */
1291 targetm.target_option.override ();
1293 /* Avoid any informative notes in the second run of -fcompare-debug. */
1294 if (flag_compare_debug)
1295 diagnostic_inhibit_notes (global_dc);
1297 if (flag_section_anchors && !target_supports_section_anchors_p ())
1299 warning (OPT_fsection_anchors,
1300 "this target does not support %qs", "-fsection-anchors");
1301 flag_section_anchors = 0;
1304 if (flag_short_enums == 2)
1305 flag_short_enums = targetm.default_short_enums ();
1307 /* Set aux_base_name if not already set. */
1310 else if (main_input_filename)
1312 char *name = xstrdup (lbasename (main_input_filename));
1314 strip_off_ending (name, strlen (name));
1315 aux_base_name = name;
1318 aux_base_name = "gccaux";
1322 || flag_graphite_identity
1324 || flag_loop_flatten
1325 || flag_loop_interchange
1326 || flag_loop_strip_mine
1327 || flag_loop_parallelize_all)
1328 sorry ("Graphite loop optimizations cannot be used (-fgraphite, "
1329 "-fgraphite-identity, -floop-block, -floop-flatten, "
1330 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1331 "and -ftree-loop-linear)");
1334 /* Unrolling all loops implies that standard loop unrolling must also
1336 if (flag_unroll_all_loops)
1337 flag_unroll_loops = 1;
1339 /* web and rename-registers help when run after loop unrolling. */
1340 if (flag_web == AUTODETECT_VALUE)
1341 flag_web = flag_unroll_loops || flag_peel_loops;
1343 if (flag_rename_registers == AUTODETECT_VALUE)
1344 flag_rename_registers = flag_unroll_loops || flag_peel_loops;
1346 if (flag_non_call_exceptions)
1347 flag_asynchronous_unwind_tables = 1;
1348 if (flag_asynchronous_unwind_tables)
1349 flag_unwind_tables = 1;
1351 if (flag_value_profile_transformations)
1352 flag_profile_values = 1;
1354 /* Warn about options that are not supported on this machine. */
1355 #ifndef INSN_SCHEDULING
1356 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1357 warning (0, "instruction scheduling not supported on this target machine");
1360 if (flag_delayed_branch)
1361 warning (0, "this target machine does not have delayed branches");
1364 user_label_prefix = USER_LABEL_PREFIX;
1365 if (flag_leading_underscore != -1)
1367 /* If the default prefix is more complicated than "" or "_",
1368 issue a warning and ignore this option. */
1369 if (user_label_prefix[0] == 0 ||
1370 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1372 user_label_prefix = flag_leading_underscore ? "_" : "";
1375 warning (0, "-f%sleading-underscore not supported on this target machine",
1376 flag_leading_underscore ? "" : "no-");
1379 /* If we are in verbose mode, write out the version and maybe all the
1380 option flags in use. */
1383 print_version (stderr, "");
1385 print_switch_values (print_to_stderr);
1388 if (flag_syntax_only)
1390 write_symbols = NO_DEBUG;
1396 if (debug_info_level == DINFO_LEVEL_NONE)
1398 debug_info_level = DINFO_LEVEL_NORMAL;
1400 if (write_symbols == NO_DEBUG)
1401 write_symbols = PREFERRED_DEBUGGING_TYPE;
1404 debug_info_level = DINFO_LEVEL_NONE;
1407 if (flag_dump_final_insns && !flag_syntax_only && !no_backend)
1409 FILE *final_output = fopen (flag_dump_final_insns, "w");
1412 error ("could not open final insn dump file %qs: %m",
1413 flag_dump_final_insns);
1414 flag_dump_final_insns = NULL;
1416 else if (fclose (final_output))
1418 error ("could not close zeroed insn dump file %qs: %m",
1419 flag_dump_final_insns);
1420 flag_dump_final_insns = NULL;
1424 /* Unless over-ridden for the target, assume that all DWARF levels
1425 may be emitted, if DWARF2_DEBUG is selected. */
1426 if (dwarf_strict < 0)
1429 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1431 if (debug_info_level == DINFO_LEVEL_NONE)
1432 write_symbols = NO_DEBUG;
1434 if (write_symbols == NO_DEBUG)
1436 #if defined(DBX_DEBUGGING_INFO)
1437 else if (write_symbols == DBX_DEBUG)
1438 debug_hooks = &dbx_debug_hooks;
1440 #if defined(XCOFF_DEBUGGING_INFO)
1441 else if (write_symbols == XCOFF_DEBUG)
1442 debug_hooks = &xcoff_debug_hooks;
1444 #ifdef SDB_DEBUGGING_INFO
1445 else if (write_symbols == SDB_DEBUG)
1446 debug_hooks = &sdb_debug_hooks;
1448 #ifdef DWARF2_DEBUGGING_INFO
1449 else if (write_symbols == DWARF2_DEBUG)
1450 debug_hooks = &dwarf2_debug_hooks;
1452 #ifdef VMS_DEBUGGING_INFO
1453 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1454 debug_hooks = &vmsdbg_debug_hooks;
1457 error ("target system does not support the \"%s\" debug format",
1458 debug_type_names[write_symbols]);
1460 /* We know which debug output will be used so we can set flag_var_tracking
1461 and flag_var_tracking_uninit if the user has not specified them. */
1462 if (debug_info_level < DINFO_LEVEL_NORMAL
1463 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
1465 if (flag_var_tracking == 1
1466 || flag_var_tracking_uninit == 1)
1468 if (debug_info_level < DINFO_LEVEL_NORMAL)
1469 warning (0, "variable tracking requested, but useless unless "
1470 "producing debug info");
1472 warning (0, "variable tracking requested, but not supported "
1473 "by this debug format");
1475 flag_var_tracking = 0;
1476 flag_var_tracking_uninit = 0;
1479 /* The debug hooks are used to implement -fdump-go-spec because it
1480 gives a simple and stable API for all the information we need to
1482 if (flag_dump_go_spec != NULL)
1483 debug_hooks = dump_go_spec_init (flag_dump_go_spec, debug_hooks);
1485 /* If the user specifically requested variable tracking with tagging
1486 uninitialized variables, we need to turn on variable tracking.
1487 (We already determined above that variable tracking is feasible.) */
1488 if (flag_var_tracking_uninit)
1489 flag_var_tracking = 1;
1491 if (flag_var_tracking == AUTODETECT_VALUE)
1492 flag_var_tracking = optimize >= 1;
1494 if (flag_var_tracking_assignments == AUTODETECT_VALUE)
1495 flag_var_tracking_assignments = flag_var_tracking
1496 && !(flag_selective_scheduling || flag_selective_scheduling2);
1498 if (flag_var_tracking_assignments_toggle)
1499 flag_var_tracking_assignments = !flag_var_tracking_assignments;
1501 if (flag_var_tracking_assignments && !flag_var_tracking)
1502 flag_var_tracking = flag_var_tracking_assignments = -1;
1504 if (flag_var_tracking_assignments
1505 && (flag_selective_scheduling || flag_selective_scheduling2))
1506 warning (0, "var-tracking-assignments changes selective scheduling");
1508 if (flag_tree_cselim == AUTODETECT_VALUE)
1509 #ifdef HAVE_conditional_move
1510 flag_tree_cselim = 1;
1512 flag_tree_cselim = 0;
1515 /* If auxiliary info generation is desired, open the output file.
1516 This goes in the same directory as the source file--unlike
1517 all the other output files. */
1518 if (flag_gen_aux_info)
1520 aux_info_file = fopen (aux_info_file_name, "w");
1521 if (aux_info_file == 0)
1522 fatal_error ("can%'t open %s: %m", aux_info_file_name);
1525 if (!targetm_common.have_named_sections)
1527 if (flag_function_sections)
1529 warning (0, "-ffunction-sections not supported for this target");
1530 flag_function_sections = 0;
1532 if (flag_data_sections)
1534 warning (0, "-fdata-sections not supported for this target");
1535 flag_data_sections = 0;
1539 if (flag_function_sections && profile_flag)
1541 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
1542 flag_function_sections = 0;
1545 #ifndef HAVE_prefetch
1546 if (flag_prefetch_loop_arrays > 0)
1548 warning (0, "-fprefetch-loop-arrays not supported for this target");
1549 flag_prefetch_loop_arrays = 0;
1552 if (flag_prefetch_loop_arrays > 0 && !HAVE_prefetch)
1554 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1555 flag_prefetch_loop_arrays = 0;
1559 /* This combination of options isn't handled for i386 targets and doesn't
1560 make much sense anyway, so don't allow it. */
1561 if (flag_prefetch_loop_arrays > 0 && optimize_size)
1563 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1564 flag_prefetch_loop_arrays = 0;
1567 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1568 if (flag_signaling_nans)
1569 flag_trapping_math = 1;
1571 /* We cannot reassociate if we want traps or signed zeros. */
1572 if (flag_associative_math && (flag_trapping_math || flag_signed_zeros))
1574 warning (0, "-fassociative-math disabled; other options take precedence");
1575 flag_associative_math = 0;
1578 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1579 if (flag_cx_limited_range)
1580 flag_complex_method = 0;
1582 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1583 if (flag_cx_fortran_rules)
1584 flag_complex_method = 1;
1586 /* Targets must be able to place spill slots at lower addresses. If the
1587 target already uses a soft frame pointer, the transition is trivial. */
1588 if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
1590 warning (0, "-fstack-protector not supported for this target");
1591 flag_stack_protect = 0;
1593 if (!flag_stack_protect)
1594 warn_stack_protect = 0;
1596 /* ??? Unwind info is not correct around the CFG unless either a frame
1597 pointer is present or A_O_A is set. Fixing this requires rewriting
1598 unwind info generation to be aware of the CFG and propagating states
1600 if (flag_unwind_tables && !ACCUMULATE_OUTGOING_ARGS
1601 && flag_omit_frame_pointer)
1603 warning (0, "unwind tables currently require a frame pointer "
1605 flag_omit_frame_pointer = 0;
1608 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1609 have not been set. */
1610 if (!global_options_set.x_warnings_are_errors
1611 && warn_coverage_mismatch
1612 && (global_dc->classify_diagnostic[OPT_Wcoverage_mismatch] ==
1614 diagnostic_classify_diagnostic (global_dc, OPT_Wcoverage_mismatch,
1615 DK_ERROR, UNKNOWN_LOCATION);
1617 /* Save the current optimization options. */
1618 optimization_default_node = build_optimization_node ();
1619 optimization_current_node = optimization_default_node;
1622 /* This function can be called multiple times to reinitialize the compiler
1623 back end when register classes or instruction sets have changed,
1624 before each function. */
1626 backend_init_target (void)
1628 /* Initialize alignment variables. */
1631 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
1632 to initialize reg_raw_mode[]. */
1635 /* This invokes target hooks to set fixed_reg[] etc, which is
1639 /* This depends on stack_pointer_rtx. */
1640 init_fake_stack_mems ();
1642 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1644 init_alias_target ();
1646 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1649 /* The following initialization functions need to generate rtl, so
1650 provide a dummy function context for them. */
1651 init_dummy_function_start ();
1653 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1654 on a mode change. */
1657 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1658 after a mode change as well. */
1659 caller_save_initialized_p = false;
1661 expand_dummy_function_end ();
1664 /* Initialize the compiler back end. This function is called only once,
1665 when starting the compiler. */
1672 init_inline_once ();
1673 init_varasm_once ();
1674 save_register_info ();
1676 /* Initialize the target-specific back end pieces. */
1678 backend_init_target ();
1681 /* Initialize excess precision settings. */
1683 init_excess_precision (void)
1685 /* Adjust excess precision handling based on the target options. If
1686 the front end cannot handle it, flag_excess_precision_cmdline
1687 will already have been set accordingly in the post_options
1689 gcc_assert (flag_excess_precision_cmdline != EXCESS_PRECISION_DEFAULT);
1690 flag_excess_precision = flag_excess_precision_cmdline;
1691 if (flag_unsafe_math_optimizations)
1692 flag_excess_precision = EXCESS_PRECISION_FAST;
1693 if (flag_excess_precision == EXCESS_PRECISION_STANDARD)
1695 int flt_eval_method = TARGET_FLT_EVAL_METHOD;
1696 switch (flt_eval_method)
1700 /* Either the target acts unpredictably (-1) or has all the
1701 operations required not to have excess precision (0). */
1702 flag_excess_precision = EXCESS_PRECISION_FAST;
1706 /* In these cases, predictable excess precision makes
1710 /* Any other implementation-defined FLT_EVAL_METHOD values
1711 require the compiler to handle the associated excess
1712 precision rules in excess_precision_type. */
1718 /* Initialize things that are both lang-dependent and target-dependent.
1719 This function can be called more than once if target parameters change. */
1721 lang_dependent_init_target (void)
1723 /* This determines excess precision settings. */
1724 init_excess_precision ();
1726 /* This creates various _DECL nodes, so needs to be called after the
1727 front end is initialized. It also depends on the HAVE_xxx macros
1728 generated from the target machine description. */
1731 /* The following initialization functions need to generate rtl, so
1732 provide a dummy function context for them. */
1733 init_dummy_function_start ();
1735 /* Do the target-specific parts of expr initialization. */
1736 init_expr_target ();
1738 /* Although the actions of these functions are language-independent,
1739 they use optabs, so we cannot call them from backend_init. */
1743 expand_dummy_function_end ();
1746 /* Language-dependent initialization. Returns nonzero on success. */
1748 lang_dependent_init (const char *name)
1750 location_t save_loc = input_location;
1751 if (dump_base_name == 0)
1752 dump_base_name = name && name[0] ? name : "gccdump";
1754 /* Other front-end initialization. */
1755 input_location = BUILTINS_LOCATION;
1756 if (lang_hooks.init () == 0)
1758 input_location = save_loc;
1762 init_asm_output (name);
1764 /* If stack usage information is desired, open the output file. */
1765 if (flag_stack_usage)
1766 stack_usage_file = open_auxiliary_file ("su");
1769 /* This creates various _DECL nodes, so needs to be called after the
1770 front end is initialized. */
1773 /* Do the target-specific parts of the initialization. */
1774 lang_dependent_init_target ();
1778 /* If dbx symbol table desired, initialize writing it and output the
1779 predefined types. */
1780 timevar_push (TV_SYMOUT);
1782 /* Now we have the correct original filename, we can initialize
1784 (*debug_hooks->init) (name);
1786 timevar_pop (TV_SYMOUT);
1793 /* Reinitialize everything when target parameters, such as register usage,
1796 target_reinit (void)
1798 struct rtl_data saved_x_rtl;
1799 rtx *saved_regno_reg_rtx;
1801 /* Save *crtl and regno_reg_rtx around the reinitialization
1802 to allow target_reinit being called even after prepare_function_start. */
1803 saved_regno_reg_rtx = regno_reg_rtx;
1804 if (saved_regno_reg_rtx)
1806 saved_x_rtl = *crtl;
1807 memset (crtl, '\0', sizeof (*crtl));
1808 regno_reg_rtx = NULL;
1811 /* Reinitialize RTL backend. */
1812 backend_init_target ();
1814 /* Reinitialize lang-dependent parts. */
1815 lang_dependent_init_target ();
1817 /* And restore it at the end, as free_after_compilation from
1818 expand_dummy_function_end clears it. */
1819 if (saved_regno_reg_rtx)
1821 *crtl = saved_x_rtl;
1822 regno_reg_rtx = saved_regno_reg_rtx;
1823 saved_regno_reg_rtx = NULL;
1828 dump_memory_report (bool final)
1830 dump_line_table_statistics ();
1831 ggc_print_statistics ();
1832 stringpool_statistics ();
1833 dump_tree_statistics ();
1834 dump_gimple_statistics ();
1835 dump_rtx_statistics ();
1836 dump_alloc_pool_statistics ();
1837 dump_bitmap_statistics ();
1838 dump_vec_loc_statistics ();
1839 dump_ggc_loc_statistics (final);
1840 dump_alias_stats (stderr);
1841 dump_pta_stats (stderr);
1844 /* Clean up: close opened files, etc. */
1847 finalize (bool no_backend)
1849 /* Close the dump files. */
1850 if (flag_gen_aux_info)
1852 fclose (aux_info_file);
1854 unlink (aux_info_file_name);
1857 /* Close non-debugging input and output files. Take special care to note
1858 whether fclose returns an error, since the pages might still be on the
1859 buffer chain while the file is open. */
1863 if (ferror (asm_out_file) != 0)
1864 fatal_error ("error writing to %s: %m", asm_file_name);
1865 if (fclose (asm_out_file) != 0)
1866 fatal_error ("error closing %s: %m", asm_file_name);
1869 if (stack_usage_file)
1870 fclose (stack_usage_file);
1876 finish_optimization_passes ();
1882 dump_memory_report (true);
1884 /* Language-specific end of compilation actions. */
1885 lang_hooks.finish ();
1888 /* Initialize the compiler, and compile the input file. */
1892 /* Initialize timing first. The C front ends read the main file in
1893 the post_options hook, and C++ does file timings. */
1894 if (time_report || !quiet_flag || flag_detailed_statistics)
1896 timevar_start (TV_TOTAL);
1900 /* Don't do any more if an error has already occurred. */
1903 timevar_start (TV_PHASE_SETUP);
1905 /* This must be run always, because it is needed to compute the FP
1906 predefined macros, such as __LDBL_MAX__, for targets using non
1907 default FP formats. */
1908 init_adjust_machine_modes ();
1910 /* Set up the back-end if requested. */
1914 /* Language-dependent initialization. Returns true on success. */
1915 if (lang_dependent_init (main_input_filename))
1917 /* Initialize yet another pass. */
1919 ggc_protect_identifiers = true;
1922 init_final (main_input_filename);
1923 coverage_init (aux_base_name);
1925 invoke_plugin_callbacks (PLUGIN_START_UNIT, NULL);
1927 timevar_stop (TV_PHASE_SETUP);
1933 timevar_stop (TV_PHASE_SETUP);
1936 timevar_start (TV_PHASE_FINALIZE);
1938 finalize (no_backend);
1940 timevar_stop (TV_PHASE_FINALIZE);
1943 /* Stop timing and print the times. */
1944 timevar_stop (TV_TOTAL);
1945 timevar_print (stderr);
1948 /* Entry point of cc1, cc1plus, jc1, f771, etc.
1949 Exit code is FATAL_EXIT_CODE if can't open files or if there were
1950 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
1952 It is not safe to call this function more than once. */
1955 toplev_main (int argc, char **argv)
1957 /* Parsing and gimplification sometimes need quite large stack.
1958 Increase stack size limits if possible. */
1959 stack_limit_increase (64 * 1024 * 1024);
1961 expandargv (&argc, &argv);
1963 /* Initialization of GCC's environment, and diagnostics. */
1964 general_init (argv[0]);
1966 /* One-off initialization of options that does not need to be
1967 repeated when options are added for particular functions. */
1968 init_options_once ();
1970 /* Initialize global options structures; this must be repeated for
1971 each structure used for parsing options. */
1972 init_options_struct (&global_options, &global_options_set);
1973 lang_hooks.init_options_struct (&global_options);
1975 /* Convert the options to an array. */
1976 decode_cmdline_options_to_array_default_mask (argc,
1977 CONST_CAST2 (const char **,
1979 &save_decoded_options,
1980 &save_decoded_options_count);
1982 /* Perform language-specific options initialization. */
1983 lang_hooks.init_options (save_decoded_options_count, save_decoded_options);
1985 /* Parse the options and do minimal processing; basically just
1986 enough to default flags appropriately. */
1987 decode_options (&global_options, &global_options_set,
1988 save_decoded_options, save_decoded_options_count,
1989 UNKNOWN_LOCATION, global_dc);
1991 handle_common_deferred_options ();
1995 initialize_plugins ();
1998 print_version (stderr, "");
2001 print_plugins_help (stderr, "");
2003 /* Exit early if we can (e.g. -help). */
2004 if (!exit_after_options)
2007 if (warningcount || errorcount)
2008 print_ignored_options ();
2009 diagnostic_finish (global_dc);
2011 /* Invoke registered plugin callbacks if any. */
2012 invoke_plugin_callbacks (PLUGIN_FINISH, NULL);
2014 finalize_plugins ();
2016 return (FATAL_EXIT_CODE);
2018 return (SUCCESS_EXIT_CODE);