1 /* Top level of GCC compilers (cc1, cc1plus, etc.)
2 Copyright (C) 1987-2015 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /* This is the top level of cc1/c++.
21 It parses command args, opens files, invokes the various passes
22 in the proper order, and counts the time used by each.
23 Error messages and low-level interface to malloc also handled here. */
27 #include "coretypes.h"
33 #include "fold-const.h"
35 #include "tree-inline.h"
36 #include "realmpfr.h" /* For GMP/MPFR/MPC versions, in print_version. */
40 #include "insn-attr.h"
41 #include "insn-config.h"
42 #include "insn-flags.h"
57 #include "diagnostic.h"
58 #include "tree-diagnostic.h"
59 #include "tree-pretty-print.h"
64 #include "dwarf2asm.h"
67 #include "common/common-target.h"
68 #include "langhooks.h"
69 #include "cfgloop.h" /* for init_set_costs */
70 #include "hosthooks.h"
73 #include "opts-diagnostic.h"
75 #include "value-prof.h"
76 #include "alloc-pool.h"
79 #include "internal-fn.h"
82 #include "pass_manager.h"
83 #include "auto-profile.h"
84 #include "dwarf2out.h"
85 #include "ipa-reference.h"
86 #include "symbol-summary.h"
89 #include "insn-codes.h"
91 #include "tree-chkp.h"
94 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
98 #ifdef SDB_DEBUGGING_INFO
102 #ifdef XCOFF_DEBUGGING_INFO
103 #include "xcoffout.h" /* Needed for external data
104 declarations for e.g. AIX 4.x. */
109 static void general_init (const char *, bool);
110 static void do_compile ();
111 static void process_options (void);
112 static void backend_init (void);
113 static int lang_dependent_init (const char *);
114 static void init_asm_output (const char *);
115 static void finalize (bool);
117 static void crash_signal (int) ATTRIBUTE_NORETURN;
118 static void compile_file (void);
120 /* True if we don't need a backend (e.g. preprocessing only). */
121 static bool no_backend;
123 /* Length of line when printing switch values. */
126 /* Decoded options, and number of such options. */
127 struct cl_decoded_option *save_decoded_options;
128 unsigned int save_decoded_options_count;
130 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
131 to optimize in process_options (). */
132 #define AUTODETECT_VALUE 2
134 /* Debug hooks - dependent upon command line options. */
136 const struct gcc_debug_hooks *debug_hooks;
138 /* The FUNCTION_DECL for the function currently being compiled,
139 or 0 if between functions. */
140 tree current_function_decl;
142 /* Set to the FUNC_BEGIN label of the current function, or NULL
144 const char * current_function_func_begin_label;
146 /* A random sequence of characters, unless overridden by user. */
147 static const char *flag_random_seed;
149 /* A local time stamp derived from the time of compilation. It will be
150 zero if the system cannot provide a time. It will be -1u, if the
151 user has specified a particular random seed. */
154 /* Random number for this compilation */
155 HOST_WIDE_INT random_seed;
159 /* When non-NULL, indicates that whenever space is allocated on the
160 stack, the resulting stack pointer must not pass this
161 address---that is, for stacks that grow downward, the stack pointer
162 must always be greater than or equal to this address; for stacks
163 that grow upward, the stack pointer must be less than this address.
164 At present, the rtx may be either a REG or a SYMBOL_REF, although
165 the support provided depends on the backend. */
168 /* True if the user has tagged the function with the 'section'
171 bool user_defined_section_attribute = false;
173 struct target_flag_state default_target_flag_state;
174 #if SWITCHABLE_TARGET
175 struct target_flag_state *this_target_flag_state = &default_target_flag_state;
177 #define this_target_flag_state (&default_target_flag_state)
180 /* The user symbol prefix after having resolved same. */
181 const char *user_label_prefix;
183 /* Output files for assembler code (real compiler output)
184 and debugging dumps. */
188 FILE *stack_usage_file = NULL;
190 /* The current working directory of a translation. It's generally the
191 directory from which compilation was initiated, but a preprocessed
192 file may specify the original directory in which it was
195 static const char *src_pwd;
197 /* Initialize src_pwd with the given string, and return true. If it
198 was already initialized, return false. As a special case, it may
199 be called with a NULL argument to test whether src_pwd has NOT been
203 set_src_pwd (const char *pwd)
207 if (strcmp (src_pwd, pwd) == 0)
213 src_pwd = xstrdup (pwd);
217 /* Return the directory from which the translation unit was initiated,
218 in case set_src_pwd() was not called before to assign it a
234 /* Called when the start of a function definition is parsed,
235 this function prints on stderr the name of the function. */
237 announce_function (tree decl)
241 if (rtl_dump_and_exit)
242 fprintf (stderr, "%s ",
243 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl))));
245 fprintf (stderr, " %s",
246 identifier_to_locale (lang_hooks.decl_printable_name (decl, 2)));
248 pp_needs_newline (global_dc->printer) = true;
249 diagnostic_set_last_function (global_dc, (diagnostic_info *) NULL);
253 /* Initialize local_tick with a random number or -1 if
254 flag_random_seed is set. */
257 init_local_tick (void)
259 if (!flag_random_seed)
261 /* Try urandom first. Time of day is too likely to collide.
262 In case of any error we just use the local tick. */
264 int fd = open ("/dev/urandom", O_RDONLY);
267 if (read (fd, &random_seed, sizeof (random_seed))
268 != sizeof (random_seed))
273 /* Now get the tick anyways */
274 #ifdef HAVE_GETTIMEOFDAY
278 gettimeofday (&tv, NULL);
279 local_tick = (unsigned) tv.tv_sec * 1000 + tv.tv_usec / 1000;
283 time_t now = time (NULL);
285 if (now != (time_t)-1)
286 local_tick = (unsigned) now;
294 /* Set up a default flag_random_seed and local_tick, unless the user
295 already specified one. Must be called after init_local_tick. */
298 init_random_seed (void)
301 random_seed = local_tick ^ getpid (); /* Old racey fallback method */
304 /* Obtain the random_seed. Unless NOINIT, initialize it if
305 it's not provided in the command line. */
308 get_random_seed (bool noinit)
310 if (!flag_random_seed && !noinit)
315 /* Modify the random_seed string to VAL. Return its previous
319 set_random_seed (const char *val)
321 const char *old = flag_random_seed;
322 flag_random_seed = val;
323 if (flag_random_seed)
327 /* When the driver passed in a hex number don't crc it again */
328 random_seed = strtoul (flag_random_seed, &endp, 0);
329 if (!(endp > flag_random_seed && *endp == 0))
330 random_seed = crc32_string (0, flag_random_seed);
335 /* Handler for fatal signals, such as SIGSEGV. These are transformed
336 into ICE messages, which is much more user friendly. In case the
337 error printer crashes, reset the signal to prevent infinite recursion. */
340 crash_signal (int signo)
342 signal (signo, SIG_DFL);
344 /* If we crashed while processing an ASM statement, then be a little more
345 graceful. It's most likely the user's fault. */
346 if (this_is_asm_operands)
348 output_operand_lossage ("unrecoverable error");
349 exit (FATAL_EXIT_CODE);
352 internal_error ("%s", strsignal (signo));
355 /* A subroutine of wrapup_global_declarations. We've come to the end of
356 the compilation unit. All deferred variables should be undeferred,
357 and all incomplete decls should be finalized. */
360 wrapup_global_declaration_1 (tree decl)
362 /* We're not deferring this any longer. Assignment is conditional to
363 avoid needlessly dirtying PCH pages. */
364 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl), TS_DECL_WITH_VIS)
365 && DECL_DEFER_OUTPUT (decl) != 0)
366 DECL_DEFER_OUTPUT (decl) = 0;
368 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
369 lang_hooks.finish_incomplete_decl (decl);
372 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
373 needs to be output. Return true if it is output. */
376 wrapup_global_declaration_2 (tree decl)
378 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl)
379 || (TREE_CODE (decl) == VAR_DECL && DECL_HAS_VALUE_EXPR_P (decl)))
382 /* Don't write out static consts, unless we still need them.
384 We also keep static consts if not optimizing (for debugging),
385 unless the user specified -fno-keep-static-consts.
386 ??? They might be better written into the debug information.
387 This is possible when using DWARF.
389 A language processor that wants static constants to be always
390 written out (even if it is not used) is responsible for
391 calling rest_of_decl_compilation itself. E.g. the C front-end
392 calls rest_of_decl_compilation from finish_decl.
393 One motivation for this is that is conventional in some
394 environments to write things like:
395 static const char rcsid[] = "... version string ...";
396 intending to force the string to be in the executable.
398 A language processor that would prefer to have unneeded
399 static constants "optimized away" would just defer writing
400 them out until here. E.g. C++ does this, because static
401 constants are often defined in header files.
403 ??? A tempting alternative (for both C and C++) would be
404 to force a constant to be written if and only if it is
405 defined in a main file, as opposed to an include file. */
407 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
411 node = varpool_node::get (decl);
413 if (!node && flag_ltrans)
415 else if (node && node->definition)
417 else if (node && node->alias)
419 else if (!symtab->global_info_ready
421 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
423 else if (node && node->analyzed)
425 else if (DECL_COMDAT (decl))
427 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
428 && (optimize || !flag_keep_static_consts
429 || DECL_ARTIFICIAL (decl)))
434 rest_of_decl_compilation (decl, 1, 1);
442 /* Do any final processing required for the declarations in VEC, of
443 which there are LEN. We write out inline functions and variables
444 that have been deferred until this point, but which are required.
445 Returns nonzero if anything was put out. */
448 wrapup_global_declarations (tree *vec, int len)
450 bool reconsider, output_something = false;
453 for (i = 0; i < len; i++)
454 wrapup_global_declaration_1 (vec[i]);
456 /* Now emit any global variables or functions that we have been
457 putting off. We need to loop in case one of the things emitted
458 here references another one which comes earlier in the list. */
462 for (i = 0; i < len; i++)
463 reconsider |= wrapup_global_declaration_2 (vec[i]);
465 output_something = true;
469 return output_something;
472 /* Issue appropriate warnings for the global declaration DECL. */
475 check_global_declaration (tree decl)
477 /* Warn about any function declared static but not defined. We don't
478 warn about variables, because many programs have static variables
479 that exist only to get some text into the object file. */
480 symtab_node *snode = symtab_node::get (decl);
481 if (TREE_CODE (decl) == FUNCTION_DECL
482 && DECL_INITIAL (decl) == 0
483 && DECL_EXTERNAL (decl)
484 && ! DECL_ARTIFICIAL (decl)
485 && ! TREE_NO_WARNING (decl)
486 && ! TREE_PUBLIC (decl)
487 && (warn_unused_function
488 || snode->referred_to_p (/*include_self=*/false)))
490 if (snode->referred_to_p (/*include_self=*/false))
491 pedwarn (input_location, 0, "%q+F used but never defined", decl);
493 warning (OPT_Wunused_function, "%q+F declared %<static%> but never defined", decl);
494 /* This symbol is effectively an "extern" declaration now. */
495 TREE_PUBLIC (decl) = 1;
498 /* Warn about static fns or vars defined but not used. */
499 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
500 /* We don't warn about "static const" variables because the
501 "rcs_id" idiom uses that construction. */
502 || (warn_unused_variable
503 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
504 && ! DECL_IN_SYSTEM_HEADER (decl)
505 && ! snode->referred_to_p (/*include_self=*/false)
506 /* This TREE_USED check is needed in addition to referred_to_p
507 above, because the `__unused__' attribute is not being
508 considered for referred_to_p. */
509 && ! TREE_USED (decl)
510 /* The TREE_USED bit for file-scope decls is kept in the identifier,
511 to handle multiple external decls in different scopes. */
512 && ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl)))
513 && ! DECL_EXTERNAL (decl)
514 && ! DECL_ARTIFICIAL (decl)
515 && ! DECL_ABSTRACT_ORIGIN (decl)
516 && ! TREE_PUBLIC (decl)
517 /* A volatile variable might be used in some non-obvious way. */
518 && ! TREE_THIS_VOLATILE (decl)
519 /* Global register variables must be declared to reserve them. */
520 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
521 /* Global ctors and dtors are called by the runtime. */
522 && (TREE_CODE (decl) != FUNCTION_DECL
523 || (!DECL_STATIC_CONSTRUCTOR (decl)
524 && !DECL_STATIC_DESTRUCTOR (decl)))
525 /* Otherwise, ask the language. */
526 && lang_hooks.decls.warn_unused_global (decl))
527 warning ((TREE_CODE (decl) == FUNCTION_DECL)
528 ? OPT_Wunused_function
529 : OPT_Wunused_variable,
530 "%q+D defined but not used", decl);
533 /* Compile an entire translation unit. Write a file of assembly
534 output and various debugging dumps. */
539 timevar_start (TV_PHASE_PARSING);
540 timevar_push (TV_PARSE_GLOBAL);
542 /* Parse entire file and generate initial debug information. */
543 lang_hooks.parse_file ();
545 timevar_pop (TV_PARSE_GLOBAL);
546 timevar_stop (TV_PHASE_PARSING);
548 if (flag_dump_locations)
549 dump_location_info (stderr);
551 /* Compilation is now finished except for writing
552 what's left of the symbol table output. */
554 if (flag_syntax_only || flag_wpa)
557 ggc_protect_identifiers = false;
559 /* Run the actual compilation process. */
562 timevar_start (TV_PHASE_OPT_GEN);
563 symtab->finalize_compilation_unit ();
564 timevar_stop (TV_PHASE_OPT_GEN);
567 /* Perform any post compilation-proper parser cleanups and
568 processing. This is currently only needed for the C++ parser,
569 which can be hopefully cleaned up so this hook is no longer
571 if (lang_hooks.decls.post_compilation_parsing_cleanups)
572 lang_hooks.decls.post_compilation_parsing_cleanups ();
577 /* After the parser has generated debugging information, augment
578 this information with any new location/etc information that may
579 have become available after the compilation proper. */
580 timevar_start (TV_PHASE_DBGINFO);
582 FOR_EACH_DEFINED_SYMBOL (node)
583 debug_hooks->late_global_decl (node->decl);
584 timevar_stop (TV_PHASE_DBGINFO);
586 timevar_start (TV_PHASE_LATE_ASM);
588 /* Compilation unit is finalized. When producing non-fat LTO object, we are
589 basically finished. */
590 if (in_lto_p || !flag_lto || flag_fat_lto_objects)
592 /* File-scope initialization for AddressSanitizer. */
593 if (flag_sanitize & SANITIZE_ADDRESS)
596 if (flag_sanitize & SANITIZE_THREAD)
599 if (flag_check_pointer_bounds)
604 output_shared_constant_pool ();
605 output_object_blocks ();
606 finish_tm_clone_pairs ();
608 /* Write out any pending weak symbol declarations. */
611 /* This must be at the end before unwind and debug info.
612 Some target ports emit PIC setup thunks here. */
613 targetm.asm_out.code_end ();
615 /* Do dbx symbols. */
616 timevar_push (TV_SYMOUT);
618 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
619 if (dwarf2out_do_frame ())
620 dwarf2out_frame_finish ();
623 (*debug_hooks->finish) (main_input_filename);
624 timevar_pop (TV_SYMOUT);
626 /* Output some stuff at end of file if nec. */
628 dw2_output_indirect_constants ();
630 /* Flush any pending external directives. */
631 process_pending_assemble_externals ();
634 /* Emit LTO marker if LTO info has been previously emitted. This is
635 used by collect2 to determine whether an object file contains IL.
636 We used to emit an undefined reference here, but this produces
637 link errors if an object file with IL is stored into a shared
638 library without invoking lto1. */
639 if (flag_generate_lto || flag_generate_offload)
641 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
642 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
644 (unsigned HOST_WIDE_INT) 1, 8);
645 #elif defined ASM_OUTPUT_ALIGNED_COMMON
646 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_v1",
647 (unsigned HOST_WIDE_INT) 1, 8);
649 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_v1",
650 (unsigned HOST_WIDE_INT) 1,
651 (unsigned HOST_WIDE_INT) 1);
655 /* Let linker plugin know that this is a slim object and must be LTOed
656 even when user did not ask for it. */
657 if (flag_generate_lto && !flag_fat_lto_objects)
659 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
660 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE, "__gnu_lto_slim",
661 (unsigned HOST_WIDE_INT) 1, 8);
662 #elif defined ASM_OUTPUT_ALIGNED_COMMON
663 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_slim",
664 (unsigned HOST_WIDE_INT) 1, 8);
666 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_slim",
667 (unsigned HOST_WIDE_INT) 1,
668 (unsigned HOST_WIDE_INT) 1);
672 /* Attach a special .ident directive to the end of the file to identify
673 the version of GCC which compiled this code. The format of the .ident
674 string is patterned after the ones produced by native SVR4 compilers. */
677 const char *pkg_version = "(GNU) ";
680 if (strcmp ("(GCC) ", pkgversion_string))
681 pkg_version = pkgversion_string;
683 ident_str = ACONCAT (("GCC: ", pkg_version, version_string, NULL));
684 targetm.asm_out.output_ident (ident_str);
687 /* Auto profile finalization. */
688 if (flag_auto_profile)
691 /* Invoke registered plugin callbacks. */
692 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT, NULL);
694 /* This must be at the end. Some target ports emit end of file directives
695 into the assembly file here, and hence we can not output anything to the
696 assembly file after this point. */
697 targetm.asm_out.file_end ();
699 timevar_stop (TV_PHASE_LATE_ASM);
702 /* Print version information to FILE.
703 Each line begins with INDENT (for the case where FILE is the
704 assembler output file).
706 If SHOW_GLOBAL_STATE is true (for cc1 etc), we are within the compiler
707 proper and can print pertinent state (e.g. params and plugins).
709 If SHOW_GLOBAL_STATE is false (for use by libgccjit), we are outside the
710 compiler, and we don't hold the mutex on the compiler's global state:
711 we can't print params and plugins, since they might not be initialized,
712 or might be being manipulated by a compile running in another
716 print_version (FILE *file, const char *indent, bool show_global_state)
718 static const char fmt1[] =
720 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
722 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
725 static const char fmt2[] =
726 N_("GMP version %s, MPFR version %s, MPC version %s\n");
727 static const char fmt3[] =
728 N_("%s%swarning: %s header version %s differs from library version %s.\n");
729 static const char fmt4[] =
730 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
732 #define __VERSION__ "[?]"
735 file == stderr ? _(fmt1) : fmt1,
736 indent, *indent != 0 ? " " : "",
737 lang_hooks.name, pkgversion_string, version_string, TARGET_NAME,
738 indent, __VERSION__);
740 /* We need to stringify the GMP macro values. Ugh, gmp_version has
741 two string formats, "i.j.k" and "i.j" when k is zero. As of
742 gmp-4.3.0, GMP always uses the 3 number format. */
743 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
744 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3 (X)
745 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
746 #define GCC_GMP_VERSION \
747 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
748 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
749 #define GCC_GMP_STRINGIFY_VERSION \
750 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
751 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR)
753 #define GCC_GMP_STRINGIFY_VERSION \
754 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
755 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR) "." \
756 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_PATCHLEVEL)
759 file == stderr ? _(fmt2) : fmt2,
760 GCC_GMP_STRINGIFY_VERSION, MPFR_VERSION_STRING, MPC_VERSION_STRING);
761 if (strcmp (GCC_GMP_STRINGIFY_VERSION, gmp_version))
763 file == stderr ? _(fmt3) : fmt3,
764 indent, *indent != 0 ? " " : "",
765 "GMP", GCC_GMP_STRINGIFY_VERSION, gmp_version);
766 if (strcmp (MPFR_VERSION_STRING, mpfr_get_version ()))
768 file == stderr ? _(fmt3) : fmt3,
769 indent, *indent != 0 ? " " : "",
770 "MPFR", MPFR_VERSION_STRING, mpfr_get_version ());
771 if (strcmp (MPC_VERSION_STRING, mpc_get_version ()))
773 file == stderr ? _(fmt3) : fmt3,
774 indent, *indent != 0 ? " " : "",
775 "MPC", MPC_VERSION_STRING, mpc_get_version ());
777 if (show_global_state)
780 file == stderr ? _(fmt4) : fmt4,
781 indent, *indent != 0 ? " " : "",
782 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
784 print_plugins_versions (file, indent);
789 print_to_asm_out_file (print_switch_type type, const char * text)
791 bool prepend_sep = true;
795 case SWITCH_TYPE_LINE_END:
796 putc ('\n', asm_out_file);
799 case SWITCH_TYPE_LINE_START:
800 fputs (ASM_COMMENT_START, asm_out_file);
801 return strlen (ASM_COMMENT_START);
803 case SWITCH_TYPE_DESCRIPTIVE:
804 if (ASM_COMMENT_START[0] == 0)
807 case SWITCH_TYPE_PASSED:
808 case SWITCH_TYPE_ENABLED:
810 fputc (' ', asm_out_file);
811 fputs (text, asm_out_file);
812 /* No need to return the length here as
813 print_single_switch has already done it. */
822 print_to_stderr (print_switch_type type, const char * text)
826 case SWITCH_TYPE_LINE_END:
830 case SWITCH_TYPE_LINE_START:
833 case SWITCH_TYPE_PASSED:
834 case SWITCH_TYPE_ENABLED:
838 case SWITCH_TYPE_DESCRIPTIVE:
839 fputs (text, stderr);
840 /* No need to return the length here as
841 print_single_switch has already done it. */
849 /* Print an option value and return the adjusted position in the line.
850 ??? print_fn doesn't handle errors, eg disk full; presumably other
851 code will catch a disk full though. */
854 print_single_switch (print_switch_fn_type print_fn,
856 print_switch_type type,
859 /* The ultrix fprintf returns 0 on success, so compute the result
860 we want here since we need it for the following test. The +1
861 is for the separator character that will probably be emitted. */
862 int len = strlen (text) + 1;
865 && pos + len > MAX_LINE)
867 print_fn (SWITCH_TYPE_LINE_END, NULL);
872 pos += print_fn (SWITCH_TYPE_LINE_START, NULL);
874 print_fn (type, text);
878 /* Print active target switches using PRINT_FN.
879 POS is the current cursor position and MAX is the size of a "line".
880 Each line begins with INDENT and ends with TERM.
881 Each switch is separated from the next by SEP. */
884 print_switch_values (print_switch_fn_type print_fn)
889 /* Fill in the -frandom-seed option, if the user didn't pass it, so
890 that it can be printed below. This helps reproducibility. */
891 if (!flag_random_seed)
894 /* Print the options as passed. */
895 pos = print_single_switch (print_fn, pos,
896 SWITCH_TYPE_DESCRIPTIVE, _("options passed: "));
898 for (j = 1; j < save_decoded_options_count; j++)
900 switch (save_decoded_options[j].opt_index)
913 pos = print_single_switch (print_fn, pos, SWITCH_TYPE_PASSED,
914 save_decoded_options[j].orig_option_with_args_text);
918 print_fn (SWITCH_TYPE_LINE_END, NULL);
920 /* Print the -f and -m options that have been enabled.
921 We don't handle language specific options but printing argv
923 pos = print_single_switch (print_fn, 0,
924 SWITCH_TYPE_DESCRIPTIVE, _("options enabled: "));
926 for (j = 0; j < cl_options_count; j++)
927 if (cl_options[j].cl_report
928 && option_enabled (j, &global_options) > 0)
929 pos = print_single_switch (print_fn, pos,
930 SWITCH_TYPE_ENABLED, cl_options[j].opt_text);
932 print_fn (SWITCH_TYPE_LINE_END, NULL);
935 /* Open assembly code output file. Do this even if -fsyntax-only is
936 on, because then the driver will have provided the name of a
937 temporary file or bit bucket for us. NAME is the file specified on
938 the command line, possibly NULL. */
940 init_asm_output (const char *name)
942 if (name == NULL && asm_file_name == 0)
943 asm_out_file = stdout;
946 if (asm_file_name == 0)
948 int len = strlen (dump_base_name);
949 char *dumpname = XNEWVEC (char, len + 6);
951 memcpy (dumpname, dump_base_name, len + 1);
952 strip_off_ending (dumpname, len);
953 strcat (dumpname, ".s");
954 asm_file_name = dumpname;
956 if (!strcmp (asm_file_name, "-"))
957 asm_out_file = stdout;
958 else if (!canonical_filename_eq (asm_file_name, name)
959 || !strcmp (asm_file_name, HOST_BIT_BUCKET))
960 asm_out_file = fopen (asm_file_name, "w");
962 /* Use UNKOWN_LOCATION to prevent gcc from printing the first
963 line in the current file. */
964 fatal_error (UNKNOWN_LOCATION,
965 "input file %qs is the same as output file",
967 if (asm_out_file == 0)
968 fatal_error (UNKNOWN_LOCATION,
969 "can%'t open %qs for writing: %m", asm_file_name);
972 if (!flag_syntax_only)
974 targetm.asm_out.file_start ();
976 if (flag_record_gcc_switches)
978 if (targetm.asm_out.record_gcc_switches)
980 /* Let the target know that we are about to start recording. */
981 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
983 /* Now record the switches. */
984 print_switch_values (targetm.asm_out.record_gcc_switches);
985 /* Let the target know that the recording is over. */
986 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
990 inform (input_location, "-frecord-gcc-switches is not supported by the current target");
993 if (flag_verbose_asm)
995 /* Print the list of switches in effect
996 into the assembler file as comments. */
997 print_version (asm_out_file, ASM_COMMENT_START, true);
998 print_switch_values (print_to_asm_out_file);
999 putc ('\n', asm_out_file);
1004 /* A helper function; used as the reallocator function for cpp's line
1007 realloc_for_line_map (void *ptr, size_t len)
1009 return ggc_realloc (ptr, len);
1012 /* A helper function: used as the allocator function for
1013 identifier_to_locale. */
1015 alloc_for_identifier_to_locale (size_t len)
1017 return ggc_alloc_atomic (len);
1020 /* Output stack usage information. */
1022 output_stack_usage (void)
1024 static bool warning_issued = false;
1025 enum stack_usage_kind_type { STATIC = 0, DYNAMIC, DYNAMIC_BOUNDED };
1026 const char *stack_usage_kind_str[] = {
1031 HOST_WIDE_INT stack_usage = current_function_static_stack_size;
1032 enum stack_usage_kind_type stack_usage_kind;
1034 if (stack_usage < 0)
1036 if (!warning_issued)
1038 warning (0, "stack usage computation not supported for this target");
1039 warning_issued = true;
1044 stack_usage_kind = STATIC;
1046 /* Add the maximum amount of space pushed onto the stack. */
1047 if (current_function_pushed_stack_size > 0)
1049 stack_usage += current_function_pushed_stack_size;
1050 stack_usage_kind = DYNAMIC_BOUNDED;
1053 /* Now on to the tricky part: dynamic stack allocation. */
1054 if (current_function_allocates_dynamic_stack_space)
1056 if (current_function_has_unbounded_dynamic_stack_size)
1057 stack_usage_kind = DYNAMIC;
1059 stack_usage_kind = DYNAMIC_BOUNDED;
1061 /* Add the size even in the unbounded case, this can't hurt. */
1062 stack_usage += current_function_dynamic_stack_size;
1065 if (flag_stack_usage)
1067 expanded_location loc
1068 = expand_location (DECL_SOURCE_LOCATION (current_function_decl));
1069 /* We don't want to print the full qualified name because it can be long,
1070 so we strip the scope prefix, but we may need to deal with the suffix
1071 created by the compiler. */
1073 = strchr (IDENTIFIER_POINTER (DECL_NAME (current_function_decl)), '.');
1075 = lang_hooks.decl_printable_name (current_function_decl, 2);
1078 const char *dot = strchr (name, '.');
1079 while (dot && strcasecmp (dot, suffix) != 0)
1082 dot = strchr (name, '.');
1087 const char *dot = strrchr (name, '.');
1092 fprintf (stack_usage_file,
1093 "%s:%d:%d:%s\t" HOST_WIDE_INT_PRINT_DEC"\t%s\n",
1094 lbasename (loc.file),
1099 stack_usage_kind_str[stack_usage_kind]);
1102 if (warn_stack_usage >= 0)
1104 const location_t loc = DECL_SOURCE_LOCATION (current_function_decl);
1106 if (stack_usage_kind == DYNAMIC)
1107 warning_at (loc, OPT_Wstack_usage_, "stack usage might be unbounded");
1108 else if (stack_usage > warn_stack_usage)
1110 if (stack_usage_kind == DYNAMIC_BOUNDED)
1112 OPT_Wstack_usage_, "stack usage might be %wd bytes",
1115 warning_at (loc, OPT_Wstack_usage_, "stack usage is %wd bytes",
1121 /* Open an auxiliary output file. */
1123 open_auxiliary_file (const char *ext)
1128 filename = concat (aux_base_name, ".", ext, NULL);
1129 file = fopen (filename, "w");
1131 fatal_error (input_location, "can%'t open %s for writing: %m", filename);
1136 /* Initialization of the front end environment, before command line
1137 options are parsed. Signal handlers, internationalization etc.
1138 ARGV0 is main's argv[0]. */
1140 general_init (const char *argv0, bool init_signals)
1144 p = argv0 + strlen (argv0);
1145 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1149 xmalloc_set_program_name (progname);
1153 /* Unlock the stdio streams. */
1154 unlock_std_streams ();
1156 gcc_init_libintl ();
1158 identifier_to_locale_alloc = alloc_for_identifier_to_locale;
1159 identifier_to_locale_free = ggc_free;
1161 /* Initialize the diagnostics reporting machinery, so option parsing
1162 can give warnings and errors. */
1163 diagnostic_initialize (global_dc, N_OPTS);
1164 /* Set a default printer. Language specific initializations will
1165 override it later. */
1166 tree_diagnostics_defaults (global_dc);
1168 global_dc->show_caret
1169 = global_options_init.x_flag_diagnostics_show_caret;
1170 global_dc->show_option_requested
1171 = global_options_init.x_flag_diagnostics_show_option;
1172 global_dc->show_column
1173 = global_options_init.x_flag_show_column;
1174 global_dc->internal_error = plugins_internal_error_function;
1175 global_dc->option_enabled = option_enabled;
1176 global_dc->option_state = &global_options;
1177 global_dc->option_name = option_name;
1181 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1183 signal (SIGSEGV, crash_signal);
1186 signal (SIGILL, crash_signal);
1189 signal (SIGBUS, crash_signal);
1192 signal (SIGABRT, crash_signal);
1194 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1195 signal (SIGIOT, crash_signal);
1198 signal (SIGFPE, crash_signal);
1201 /* Other host-specific signal setup. */
1202 (*host_hooks.extra_signals)();
1205 /* Initialize the garbage-collector, string pools and tree type hash
1209 input_location = UNKNOWN_LOCATION;
1210 line_table = ggc_alloc<line_maps> ();
1211 linemap_init (line_table, BUILTINS_LOCATION);
1212 line_table->reallocator = realloc_for_line_map;
1213 line_table->round_alloc_size = ggc_round_alloc_size;
1216 /* Initialize register usage now so switches may override. */
1219 /* Register the language-independent parameters. */
1220 global_init_params ();
1222 /* This must be done after global_init_params but before argument
1224 init_ggc_heuristics ();
1226 /* Create the singleton holder for global state.
1227 Doing so also creates the pass manager and with it the passes. */
1228 g = new gcc::context ();
1229 symtab = new (ggc_cleared_alloc <symbol_table> ()) symbol_table ();
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_interchange
1325 || flag_loop_strip_mine
1326 || flag_loop_parallelize_all
1327 || flag_loop_unroll_jam)
1328 sorry ("Graphite loop optimizations cannot be used (ISL is not available)"
1329 "(-fgraphite, -fgraphite-identity, -floop-block, "
1330 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1331 "-floop-unroll-and-jam, and -ftree-loop-linear)");
1334 if (flag_check_pointer_bounds)
1336 if (targetm.chkp_bound_mode () == VOIDmode)
1338 error ("-fcheck-pointer-bounds is not supported for this target");
1339 flag_check_pointer_bounds = 0;
1342 if (flag_sanitize & SANITIZE_ADDRESS)
1344 error ("-fcheck-pointer-bounds is not supported with "
1345 "Address Sanitizer");
1346 flag_check_pointer_bounds = 0;
1350 /* One region RA really helps to decrease the code size. */
1351 if (flag_ira_region == IRA_REGION_AUTODETECT)
1353 = optimize_size || !optimize ? IRA_REGION_ONE : IRA_REGION_MIXED;
1355 if (!abi_version_at_least (2))
1357 /* -fabi-version=1 support was removed after GCC 4.9. */
1358 error ("%<-fabi-version=1%> is no longer supported");
1359 flag_abi_version = 2;
1362 /* Unrolling all loops implies that standard loop unrolling must also
1364 if (flag_unroll_all_loops)
1365 flag_unroll_loops = 1;
1367 /* web and rename-registers help when run after loop unrolling. */
1368 if (flag_web == AUTODETECT_VALUE)
1369 flag_web = flag_unroll_loops || flag_peel_loops;
1371 if (flag_rename_registers == AUTODETECT_VALUE)
1372 flag_rename_registers = flag_unroll_loops || flag_peel_loops;
1374 if (flag_non_call_exceptions)
1375 flag_asynchronous_unwind_tables = 1;
1376 if (flag_asynchronous_unwind_tables)
1377 flag_unwind_tables = 1;
1379 if (flag_value_profile_transformations)
1380 flag_profile_values = 1;
1382 /* Warn about options that are not supported on this machine. */
1383 #ifndef INSN_SCHEDULING
1384 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1385 warning (0, "instruction scheduling not supported on this target machine");
1388 if (flag_delayed_branch)
1389 warning (0, "this target machine does not have delayed branches");
1392 user_label_prefix = USER_LABEL_PREFIX;
1393 if (flag_leading_underscore != -1)
1395 /* If the default prefix is more complicated than "" or "_",
1396 issue a warning and ignore this option. */
1397 if (user_label_prefix[0] == 0 ||
1398 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1400 user_label_prefix = flag_leading_underscore ? "_" : "";
1403 warning (0, "-f%sleading-underscore not supported on this target machine",
1404 flag_leading_underscore ? "" : "no-");
1407 /* If we are in verbose mode, write out the version and maybe all the
1408 option flags in use. */
1411 print_version (stderr, "", true);
1413 print_switch_values (print_to_stderr);
1416 if (flag_syntax_only)
1418 write_symbols = NO_DEBUG;
1424 if (debug_info_level == DINFO_LEVEL_NONE)
1426 debug_info_level = DINFO_LEVEL_NORMAL;
1428 if (write_symbols == NO_DEBUG)
1429 write_symbols = PREFERRED_DEBUGGING_TYPE;
1432 debug_info_level = DINFO_LEVEL_NONE;
1435 if (flag_dump_final_insns && !flag_syntax_only && !no_backend)
1437 FILE *final_output = fopen (flag_dump_final_insns, "w");
1440 error ("could not open final insn dump file %qs: %m",
1441 flag_dump_final_insns);
1442 flag_dump_final_insns = NULL;
1444 else if (fclose (final_output))
1446 error ("could not close zeroed insn dump file %qs: %m",
1447 flag_dump_final_insns);
1448 flag_dump_final_insns = NULL;
1452 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1454 if (debug_info_level == DINFO_LEVEL_NONE)
1455 write_symbols = NO_DEBUG;
1457 if (write_symbols == NO_DEBUG)
1459 #if defined(DBX_DEBUGGING_INFO)
1460 else if (write_symbols == DBX_DEBUG)
1461 debug_hooks = &dbx_debug_hooks;
1463 #if defined(XCOFF_DEBUGGING_INFO)
1464 else if (write_symbols == XCOFF_DEBUG)
1465 debug_hooks = &xcoff_debug_hooks;
1467 #ifdef SDB_DEBUGGING_INFO
1468 else if (write_symbols == SDB_DEBUG)
1469 debug_hooks = &sdb_debug_hooks;
1471 #ifdef DWARF2_DEBUGGING_INFO
1472 else if (write_symbols == DWARF2_DEBUG)
1473 debug_hooks = &dwarf2_debug_hooks;
1475 #ifdef VMS_DEBUGGING_INFO
1476 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1477 debug_hooks = &vmsdbg_debug_hooks;
1480 error ("target system does not support the %qs debug format",
1481 debug_type_names[write_symbols]);
1483 /* We know which debug output will be used so we can set flag_var_tracking
1484 and flag_var_tracking_uninit if the user has not specified them. */
1485 if (debug_info_level < DINFO_LEVEL_NORMAL
1486 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
1488 if (flag_var_tracking == 1
1489 || flag_var_tracking_uninit == 1)
1491 if (debug_info_level < DINFO_LEVEL_NORMAL)
1492 warning (0, "variable tracking requested, but useless unless "
1493 "producing debug info");
1495 warning (0, "variable tracking requested, but not supported "
1496 "by this debug format");
1498 flag_var_tracking = 0;
1499 flag_var_tracking_uninit = 0;
1502 /* The debug hooks are used to implement -fdump-go-spec because it
1503 gives a simple and stable API for all the information we need to
1505 if (flag_dump_go_spec != NULL)
1506 debug_hooks = dump_go_spec_init (flag_dump_go_spec, debug_hooks);
1508 /* If the user specifically requested variable tracking with tagging
1509 uninitialized variables, we need to turn on variable tracking.
1510 (We already determined above that variable tracking is feasible.) */
1511 if (flag_var_tracking_uninit == 1)
1512 flag_var_tracking = 1;
1514 if (flag_var_tracking == AUTODETECT_VALUE)
1515 flag_var_tracking = optimize >= 1;
1517 if (flag_var_tracking_uninit == AUTODETECT_VALUE)
1518 flag_var_tracking_uninit = flag_var_tracking;
1520 if (flag_var_tracking_assignments == AUTODETECT_VALUE)
1521 flag_var_tracking_assignments = flag_var_tracking
1522 && !(flag_selective_scheduling || flag_selective_scheduling2);
1524 if (flag_var_tracking_assignments_toggle)
1525 flag_var_tracking_assignments = !flag_var_tracking_assignments;
1527 if (flag_var_tracking_assignments && !flag_var_tracking)
1528 flag_var_tracking = flag_var_tracking_assignments = -1;
1530 if (flag_var_tracking_assignments
1531 && (flag_selective_scheduling || flag_selective_scheduling2))
1532 warning (0, "var-tracking-assignments changes selective scheduling");
1534 if (flag_tree_cselim == AUTODETECT_VALUE)
1536 if (HAVE_conditional_move)
1537 flag_tree_cselim = 1;
1539 flag_tree_cselim = 0;
1542 /* If auxiliary info generation is desired, open the output file.
1543 This goes in the same directory as the source file--unlike
1544 all the other output files. */
1545 if (flag_gen_aux_info)
1547 aux_info_file = fopen (aux_info_file_name, "w");
1548 if (aux_info_file == 0)
1549 fatal_error (input_location, "can%'t open %s: %m", aux_info_file_name);
1552 if (!targetm_common.have_named_sections)
1554 if (flag_function_sections)
1556 warning (0, "-ffunction-sections not supported for this target");
1557 flag_function_sections = 0;
1559 if (flag_data_sections)
1561 warning (0, "-fdata-sections not supported for this target");
1562 flag_data_sections = 0;
1566 if (flag_prefetch_loop_arrays > 0 && !targetm.code_for_prefetch)
1568 warning (0, "-fprefetch-loop-arrays not supported for this target");
1569 flag_prefetch_loop_arrays = 0;
1571 else if (flag_prefetch_loop_arrays > 0 && !targetm.have_prefetch ())
1573 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1574 flag_prefetch_loop_arrays = 0;
1577 /* This combination of options isn't handled for i386 targets and doesn't
1578 make much sense anyway, so don't allow it. */
1579 if (flag_prefetch_loop_arrays > 0 && optimize_size)
1581 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1582 flag_prefetch_loop_arrays = 0;
1585 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1586 if (flag_signaling_nans)
1587 flag_trapping_math = 1;
1589 /* We cannot reassociate if we want traps or signed zeros. */
1590 if (flag_associative_math && (flag_trapping_math || flag_signed_zeros))
1592 warning (0, "-fassociative-math disabled; other options take precedence");
1593 flag_associative_math = 0;
1596 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1597 if (flag_cx_limited_range)
1598 flag_complex_method = 0;
1600 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1601 if (flag_cx_fortran_rules)
1602 flag_complex_method = 1;
1604 /* Targets must be able to place spill slots at lower addresses. If the
1605 target already uses a soft frame pointer, the transition is trivial. */
1606 if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
1608 warning (0, "-fstack-protector not supported for this target");
1609 flag_stack_protect = 0;
1611 if (!flag_stack_protect)
1612 warn_stack_protect = 0;
1614 /* Address Sanitizer needs porting to each target architecture. */
1616 if ((flag_sanitize & SANITIZE_ADDRESS)
1617 && !FRAME_GROWS_DOWNWARD)
1620 "-fsanitize=address and -fsanitize=kernel-address "
1621 "are not supported for this target");
1622 flag_sanitize &= ~SANITIZE_ADDRESS;
1625 if ((flag_sanitize & SANITIZE_USER_ADDRESS)
1626 && targetm.asan_shadow_offset == NULL)
1628 warning (0, "-fsanitize=address not supported for this target");
1629 flag_sanitize &= ~SANITIZE_ADDRESS;
1632 /* Do not use IPA optimizations for register allocation if profiler is active
1633 or port does not emit prologue and epilogue as RTL. */
1634 if (profile_flag || !targetm.have_prologue () || !targetm.have_epilogue ())
1637 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1638 have not been set. */
1639 if (!global_options_set.x_warnings_are_errors
1640 && warn_coverage_mismatch
1641 && (global_dc->classify_diagnostic[OPT_Wcoverage_mismatch] ==
1643 diagnostic_classify_diagnostic (global_dc, OPT_Wcoverage_mismatch,
1644 DK_ERROR, UNKNOWN_LOCATION);
1646 /* Save the current optimization options. */
1647 optimization_default_node = build_optimization_node (&global_options);
1648 optimization_current_node = optimization_default_node;
1650 /* Please don't change global_options after this point, those changes won't
1651 be reflected in optimization_{default,current}_node. */
1654 /* This function can be called multiple times to reinitialize the compiler
1655 back end when register classes or instruction sets have changed,
1656 before each function. */
1658 backend_init_target (void)
1660 /* Initialize alignment variables. */
1663 /* This depends on stack_pointer_rtx. */
1664 init_fake_stack_mems ();
1666 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1668 init_alias_target ();
1670 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1673 /* Depends on the enabled attribute. */
1676 /* The following initialization functions need to generate rtl, so
1677 provide a dummy function context for them. */
1678 init_dummy_function_start ();
1680 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1681 on a mode change. */
1683 init_lower_subreg ();
1686 init_expr_target ();
1689 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1690 after a mode change as well. */
1691 caller_save_initialized_p = false;
1693 expand_dummy_function_end ();
1696 /* Initialize the compiler back end. This function is called only once,
1697 when starting the compiler. */
1704 init_inline_once ();
1705 init_varasm_once ();
1706 save_register_info ();
1708 /* Middle end needs this initialization for default mem attributes
1709 used by early calls to make_decl_rtl. */
1712 /* Middle end needs this initialization for mode tables used to assign
1713 modes to vector variables. */
1717 /* Initialize excess precision settings. */
1719 init_excess_precision (void)
1721 /* Adjust excess precision handling based on the target options. If
1722 the front end cannot handle it, flag_excess_precision_cmdline
1723 will already have been set accordingly in the post_options
1725 gcc_assert (flag_excess_precision_cmdline != EXCESS_PRECISION_DEFAULT);
1726 flag_excess_precision = flag_excess_precision_cmdline;
1727 if (flag_unsafe_math_optimizations)
1728 flag_excess_precision = EXCESS_PRECISION_FAST;
1729 if (flag_excess_precision == EXCESS_PRECISION_STANDARD)
1731 int flt_eval_method = TARGET_FLT_EVAL_METHOD;
1732 switch (flt_eval_method)
1736 /* Either the target acts unpredictably (-1) or has all the
1737 operations required not to have excess precision (0). */
1738 flag_excess_precision = EXCESS_PRECISION_FAST;
1742 /* In these cases, predictable excess precision makes
1746 /* Any other implementation-defined FLT_EVAL_METHOD values
1747 require the compiler to handle the associated excess
1748 precision rules in excess_precision_type. */
1754 /* Initialize things that are both lang-dependent and target-dependent.
1755 This function can be called more than once if target parameters change. */
1757 lang_dependent_init_target (void)
1759 /* This determines excess precision settings. */
1760 init_excess_precision ();
1762 /* This creates various _DECL nodes, so needs to be called after the
1763 front end is initialized. It also depends on the HAVE_xxx macros
1764 generated from the target machine description. */
1767 gcc_assert (!this_target_rtl->target_specific_initialized);
1770 /* Perform initializations that are lang-dependent or target-dependent.
1771 but matters only for late optimizations and RTL generation. */
1773 static int rtl_initialized;
1776 initialize_rtl (void)
1778 auto_timevar tv (TV_INITIALIZE_RTL);
1780 /* Initialization done just once per compilation, but delayed
1781 till code generation. */
1782 if (!rtl_initialized)
1784 rtl_initialized = true;
1786 /* Target specific RTL backend initialization. */
1787 if (!this_target_rtl->target_specific_initialized)
1789 backend_init_target ();
1790 this_target_rtl->target_specific_initialized = true;
1794 /* Language-dependent initialization. Returns nonzero on success. */
1796 lang_dependent_init (const char *name)
1798 location_t save_loc = input_location;
1799 if (dump_base_name == 0)
1800 dump_base_name = name && name[0] ? name : "gccdump";
1802 /* Other front-end initialization. */
1803 input_location = BUILTINS_LOCATION;
1804 if (lang_hooks.init () == 0)
1806 input_location = save_loc;
1810 init_asm_output (name);
1812 /* If stack usage information is desired, open the output file. */
1813 if (flag_stack_usage)
1814 stack_usage_file = open_auxiliary_file ("su");
1817 /* This creates various _DECL nodes, so needs to be called after the
1818 front end is initialized. */
1821 /* Do the target-specific parts of the initialization. */
1822 lang_dependent_init_target ();
1826 /* If dbx symbol table desired, initialize writing it and output the
1827 predefined types. */
1828 timevar_push (TV_SYMOUT);
1830 /* Now we have the correct original filename, we can initialize
1832 (*debug_hooks->init) (name);
1834 timevar_pop (TV_SYMOUT);
1841 /* Reinitialize everything when target parameters, such as register usage,
1844 target_reinit (void)
1846 struct rtl_data saved_x_rtl;
1847 rtx *saved_regno_reg_rtx;
1848 tree saved_optimization_current_node;
1849 struct target_optabs *saved_this_fn_optabs;
1851 /* Temporarily switch to the default optimization node, so that
1852 *this_target_optabs is set to the default, not reflecting
1853 whatever a previous function used for the optimize
1855 saved_optimization_current_node = optimization_current_node;
1856 saved_this_fn_optabs = this_fn_optabs;
1857 if (saved_optimization_current_node != optimization_default_node)
1859 optimization_current_node = optimization_default_node;
1860 cl_optimization_restore
1862 TREE_OPTIMIZATION (optimization_default_node));
1864 this_fn_optabs = this_target_optabs;
1866 /* Save *crtl and regno_reg_rtx around the reinitialization
1867 to allow target_reinit being called even after prepare_function_start. */
1868 saved_regno_reg_rtx = regno_reg_rtx;
1869 if (saved_regno_reg_rtx)
1871 saved_x_rtl = *crtl;
1872 memset (crtl, '\0', sizeof (*crtl));
1873 regno_reg_rtx = NULL;
1876 this_target_rtl->target_specific_initialized = false;
1878 /* This initializes hard_frame_pointer, and calls init_reg_modes_target()
1879 to initialize reg_raw_mode[]. */
1882 /* This invokes target hooks to set fixed_reg[] etc, which is
1886 /* Reinitialize lang-dependent parts. */
1887 lang_dependent_init_target ();
1889 /* Restore the original optimization node. */
1890 if (saved_optimization_current_node != optimization_default_node)
1892 optimization_current_node = saved_optimization_current_node;
1893 cl_optimization_restore (&global_options,
1894 TREE_OPTIMIZATION (optimization_current_node));
1896 this_fn_optabs = saved_this_fn_optabs;
1898 /* Restore regno_reg_rtx at the end, as free_after_compilation from
1899 expand_dummy_function_end clears it. */
1900 if (saved_regno_reg_rtx)
1902 *crtl = saved_x_rtl;
1903 regno_reg_rtx = saved_regno_reg_rtx;
1904 saved_regno_reg_rtx = NULL;
1909 dump_memory_report (bool final)
1911 dump_line_table_statistics ();
1912 ggc_print_statistics ();
1913 stringpool_statistics ();
1914 dump_tree_statistics ();
1915 dump_gimple_statistics ();
1916 dump_rtx_statistics ();
1917 dump_alloc_pool_statistics ();
1918 dump_bitmap_statistics ();
1919 dump_hash_table_loc_statistics ();
1920 dump_vec_loc_statistics ();
1921 dump_ggc_loc_statistics (final);
1922 dump_alias_stats (stderr);
1923 dump_pta_stats (stderr);
1926 /* Clean up: close opened files, etc. */
1929 finalize (bool no_backend)
1931 /* Close the dump files. */
1932 if (flag_gen_aux_info)
1934 fclose (aux_info_file);
1936 unlink (aux_info_file_name);
1939 /* Close non-debugging input and output files. Take special care to note
1940 whether fclose returns an error, since the pages might still be on the
1941 buffer chain while the file is open. */
1945 if (ferror (asm_out_file) != 0)
1946 fatal_error (input_location, "error writing to %s: %m", asm_file_name);
1947 if (fclose (asm_out_file) != 0)
1948 fatal_error (input_location, "error closing %s: %m", asm_file_name);
1951 if (stack_usage_file)
1952 fclose (stack_usage_file);
1958 g->get_passes ()->finish_optimization_passes ();
1964 dump_memory_report (true);
1967 dump_profile_report ();
1969 /* Language-specific end of compilation actions. */
1970 lang_hooks.finish ();
1974 standard_type_bitsize (int bitsize)
1976 /* As a special exception, we always want __int128 enabled if possible. */
1979 if (bitsize == CHAR_TYPE_SIZE
1980 || bitsize == SHORT_TYPE_SIZE
1981 || bitsize == INT_TYPE_SIZE
1982 || bitsize == LONG_TYPE_SIZE
1983 || bitsize == LONG_LONG_TYPE_SIZE)
1988 /* Initialize the compiler, and compile the input file. */
1994 /* Don't do any more if an error has already occurred. */
1999 timevar_start (TV_PHASE_SETUP);
2001 /* This must be run always, because it is needed to compute the FP
2002 predefined macros, such as __LDBL_MAX__, for targets using non
2003 default FP formats. */
2004 init_adjust_machine_modes ();
2005 init_derived_machine_modes ();
2007 /* This must happen after the backend has a chance to process
2008 command line options, but before the parsers are
2010 for (i = 0; i < NUM_INT_N_ENTS; i ++)
2011 if (targetm.scalar_mode_supported_p (int_n_data[i].m)
2012 && ! standard_type_bitsize (int_n_data[i].bitsize))
2013 int_n_enabled_p[i] = true;
2015 int_n_enabled_p[i] = false;
2017 /* Set up the back-end if requested. */
2021 /* Language-dependent initialization. Returns true on success. */
2022 if (lang_dependent_init (main_input_filename))
2024 /* Initialize yet another pass. */
2026 ggc_protect_identifiers = true;
2028 symtab->initialize ();
2029 init_final (main_input_filename);
2030 coverage_init (aux_base_name);
2032 invoke_plugin_callbacks (PLUGIN_START_UNIT, NULL);
2034 timevar_stop (TV_PHASE_SETUP);
2040 timevar_stop (TV_PHASE_SETUP);
2043 timevar_start (TV_PHASE_FINALIZE);
2045 finalize (no_backend);
2047 timevar_stop (TV_PHASE_FINALIZE);
2051 toplev::toplev (bool use_TV_TOTAL, bool init_signals)
2052 : m_use_TV_TOTAL (use_TV_TOTAL),
2053 m_init_signals (init_signals)
2055 if (!m_use_TV_TOTAL)
2063 g_timer->stop (TV_TOTAL);
2064 g_timer->print (stderr);
2069 toplev::start_timevars ()
2071 if (time_report || !quiet_flag || flag_detailed_statistics)
2074 timevar_start (TV_TOTAL);
2077 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2078 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2079 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2081 It is not safe to call this function more than once. */
2084 toplev::main (int argc, char **argv)
2086 /* Parsing and gimplification sometimes need quite large stack.
2087 Increase stack size limits if possible. */
2088 stack_limit_increase (64 * 1024 * 1024);
2090 expandargv (&argc, &argv);
2092 /* Initialization of GCC's environment, and diagnostics. */
2093 general_init (argv[0], m_init_signals);
2095 /* One-off initialization of options that does not need to be
2096 repeated when options are added for particular functions. */
2097 init_options_once ();
2099 /* Initialize global options structures; this must be repeated for
2100 each structure used for parsing options. */
2101 init_options_struct (&global_options, &global_options_set);
2102 lang_hooks.init_options_struct (&global_options);
2104 /* Convert the options to an array. */
2105 decode_cmdline_options_to_array_default_mask (argc,
2106 CONST_CAST2 (const char **,
2108 &save_decoded_options,
2109 &save_decoded_options_count);
2111 /* Perform language-specific options initialization. */
2112 lang_hooks.init_options (save_decoded_options_count, save_decoded_options);
2114 /* Parse the options and do minimal processing; basically just
2115 enough to default flags appropriately. */
2116 decode_options (&global_options, &global_options_set,
2117 save_decoded_options, save_decoded_options_count,
2118 UNKNOWN_LOCATION, global_dc);
2120 handle_common_deferred_options ();
2124 initialize_plugins ();
2127 print_version (stderr, "", true);
2130 print_plugins_help (stderr, "");
2132 /* Exit early if we can (e.g. -help). */
2133 if (!exit_after_options)
2140 if (warningcount || errorcount || werrorcount)
2141 print_ignored_options ();
2143 /* Invoke registered plugin callbacks if any. Some plugins could
2144 emit some diagnostics here. */
2145 invoke_plugin_callbacks (PLUGIN_FINISH, NULL);
2147 diagnostic_finish (global_dc);
2149 finalize_plugins ();
2150 location_adhoc_data_fini (line_table);
2151 if (seen_error () || werrorcount)
2152 return (FATAL_EXIT_CODE);
2154 return (SUCCESS_EXIT_CODE);
2157 /* For those that want to, this function aims to clean up enough state that
2158 you can call toplev::main again. */
2160 toplev::finalize (void)
2162 rtl_initialized = false;
2163 this_target_rtl->target_specific_initialized = false;
2165 /* Needs to be called before cgraph_c_finalize since it uses symtab. */
2166 ipa_reference_c_finalize ();
2168 cgraph_c_finalize ();
2169 cgraphunit_c_finalize ();
2170 dwarf2out_c_finalize ();
2172 ipa_cp_c_finalize ();
2173 ira_costs_c_finalize ();
2174 params_c_finalize ();
2176 finalize_options_struct (&global_options);
2177 finalize_options_struct (&global_options_set);
2179 XDELETEVEC (save_decoded_options);
2181 /* Clean up the context (and pass_manager etc). */
2185 obstack_free (&opts_obstack, NULL);