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 "alloc-pool.h"
36 #include "optabs-libfuncs.h"
37 #include "insn-config.h"
42 #include "diagnostic.h"
44 #include "tree-inline.h"
45 #include "realmpfr.h" /* For GMP/MPFR/MPC versions, in print_version. */
48 #include "insn-attr.h"
53 #include "tree-diagnostic.h"
57 #include "dwarf2asm.h"
59 #include "common/common-target.h"
60 #include "langhooks.h"
61 #include "cfgloop.h" /* for init_set_costs */
62 #include "hosthooks.h"
64 #include "opts-diagnostic.h"
69 #include "pass_manager.h"
70 #include "auto-profile.h"
71 #include "dwarf2out.h"
72 #include "ipa-reference.h"
73 #include "symbol-summary.h"
76 #include "tree-chkp.h"
79 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
85 #ifdef XCOFF_DEBUGGING_INFO
86 #include "xcoffout.h" /* Needed for external data declarations. */
91 static void general_init (const char *, bool);
92 static void do_compile ();
93 static void process_options (void);
94 static void backend_init (void);
95 static int lang_dependent_init (const char *);
96 static void init_asm_output (const char *);
97 static void finalize (bool);
99 static void crash_signal (int) ATTRIBUTE_NORETURN
;
100 static void compile_file (void);
102 /* True if we don't need a backend (e.g. preprocessing only). */
103 static bool no_backend
;
105 /* Length of line when printing switch values. */
108 /* Decoded options, and number of such options. */
109 struct cl_decoded_option
*save_decoded_options
;
110 unsigned int save_decoded_options_count
;
112 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
113 to optimize in process_options (). */
114 #define AUTODETECT_VALUE 2
116 /* Debug hooks - dependent upon command line options. */
118 const struct gcc_debug_hooks
*debug_hooks
;
120 /* The FUNCTION_DECL for the function currently being compiled,
121 or 0 if between functions. */
122 tree current_function_decl
;
124 /* Set to the FUNC_BEGIN label of the current function, or NULL
126 const char * current_function_func_begin_label
;
128 /* A random sequence of characters, unless overridden by user. */
129 static const char *flag_random_seed
;
131 /* A local time stamp derived from the time of compilation. It will be
132 zero if the system cannot provide a time. It will be -1u, if the
133 user has specified a particular random seed. */
136 /* Random number for this compilation */
137 HOST_WIDE_INT random_seed
;
141 /* When non-NULL, indicates that whenever space is allocated on the
142 stack, the resulting stack pointer must not pass this
143 address---that is, for stacks that grow downward, the stack pointer
144 must always be greater than or equal to this address; for stacks
145 that grow upward, the stack pointer must be less than this address.
146 At present, the rtx may be either a REG or a SYMBOL_REF, although
147 the support provided depends on the backend. */
150 /* True if the user has tagged the function with the 'section'
153 bool user_defined_section_attribute
= false;
155 struct target_flag_state default_target_flag_state
;
156 #if SWITCHABLE_TARGET
157 struct target_flag_state
*this_target_flag_state
= &default_target_flag_state
;
159 #define this_target_flag_state (&default_target_flag_state)
162 /* The user symbol prefix after having resolved same. */
163 const char *user_label_prefix
;
165 /* Output files for assembler code (real compiler output)
166 and debugging dumps. */
170 FILE *stack_usage_file
= NULL
;
172 /* The current working directory of a translation. It's generally the
173 directory from which compilation was initiated, but a preprocessed
174 file may specify the original directory in which it was
177 static const char *src_pwd
;
179 /* Initialize src_pwd with the given string, and return true. If it
180 was already initialized, return false. As a special case, it may
181 be called with a NULL argument to test whether src_pwd has NOT been
185 set_src_pwd (const char *pwd
)
189 if (strcmp (src_pwd
, pwd
) == 0)
195 src_pwd
= xstrdup (pwd
);
199 /* Return the directory from which the translation unit was initiated,
200 in case set_src_pwd() was not called before to assign it a
216 /* Called when the start of a function definition is parsed,
217 this function prints on stderr the name of the function. */
219 announce_function (tree decl
)
223 if (rtl_dump_and_exit
)
224 fprintf (stderr
, "%s ",
225 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl
))));
227 fprintf (stderr
, " %s",
228 identifier_to_locale (lang_hooks
.decl_printable_name (decl
, 2)));
230 pp_needs_newline (global_dc
->printer
) = true;
231 diagnostic_set_last_function (global_dc
, (diagnostic_info
*) NULL
);
235 /* Initialize local_tick with a random number or -1 if
236 flag_random_seed is set. */
239 init_local_tick (void)
241 if (!flag_random_seed
)
243 /* Try urandom first. Time of day is too likely to collide.
244 In case of any error we just use the local tick. */
246 int fd
= open ("/dev/urandom", O_RDONLY
);
249 if (read (fd
, &random_seed
, sizeof (random_seed
))
250 != sizeof (random_seed
))
255 /* Now get the tick anyways */
256 #ifdef HAVE_GETTIMEOFDAY
260 gettimeofday (&tv
, NULL
);
261 local_tick
= (unsigned) tv
.tv_sec
* 1000 + tv
.tv_usec
/ 1000;
265 time_t now
= time (NULL
);
267 if (now
!= (time_t)-1)
268 local_tick
= (unsigned) now
;
276 /* Set up a default flag_random_seed and local_tick, unless the user
277 already specified one. Must be called after init_local_tick. */
280 init_random_seed (void)
283 random_seed
= local_tick
^ getpid (); /* Old racey fallback method */
286 /* Obtain the random_seed. Unless NOINIT, initialize it if
287 it's not provided in the command line. */
290 get_random_seed (bool noinit
)
292 if (!flag_random_seed
&& !noinit
)
297 /* Modify the random_seed string to VAL. Return its previous
301 set_random_seed (const char *val
)
303 const char *old
= flag_random_seed
;
304 flag_random_seed
= val
;
305 if (flag_random_seed
)
309 /* When the driver passed in a hex number don't crc it again */
310 random_seed
= strtoul (flag_random_seed
, &endp
, 0);
311 if (!(endp
> flag_random_seed
&& *endp
== 0))
312 random_seed
= crc32_string (0, flag_random_seed
);
317 /* Handler for fatal signals, such as SIGSEGV. These are transformed
318 into ICE messages, which is much more user friendly. In case the
319 error printer crashes, reset the signal to prevent infinite recursion. */
322 crash_signal (int signo
)
324 signal (signo
, SIG_DFL
);
326 /* If we crashed while processing an ASM statement, then be a little more
327 graceful. It's most likely the user's fault. */
328 if (this_is_asm_operands
)
330 output_operand_lossage ("unrecoverable error");
331 exit (FATAL_EXIT_CODE
);
334 internal_error ("%s", strsignal (signo
));
337 /* A subroutine of wrapup_global_declarations. We've come to the end of
338 the compilation unit. All deferred variables should be undeferred,
339 and all incomplete decls should be finalized. */
342 wrapup_global_declaration_1 (tree decl
)
344 /* We're not deferring this any longer. Assignment is conditional to
345 avoid needlessly dirtying PCH pages. */
346 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl
), TS_DECL_WITH_VIS
)
347 && DECL_DEFER_OUTPUT (decl
) != 0)
348 DECL_DEFER_OUTPUT (decl
) = 0;
350 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0)
351 lang_hooks
.finish_incomplete_decl (decl
);
354 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
355 needs to be output. Return true if it is output. */
358 wrapup_global_declaration_2 (tree decl
)
360 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
)
361 || (TREE_CODE (decl
) == VAR_DECL
&& DECL_HAS_VALUE_EXPR_P (decl
)))
364 /* Don't write out static consts, unless we still need them.
366 We also keep static consts if not optimizing (for debugging),
367 unless the user specified -fno-keep-static-consts.
368 ??? They might be better written into the debug information.
369 This is possible when using DWARF.
371 A language processor that wants static constants to be always
372 written out (even if it is not used) is responsible for
373 calling rest_of_decl_compilation itself. E.g. the C front-end
374 calls rest_of_decl_compilation from finish_decl.
375 One motivation for this is that is conventional in some
376 environments to write things like:
377 static const char rcsid[] = "... version string ...";
378 intending to force the string to be in the executable.
380 A language processor that would prefer to have unneeded
381 static constants "optimized away" would just defer writing
382 them out until here. E.g. C++ does this, because static
383 constants are often defined in header files.
385 ??? A tempting alternative (for both C and C++) would be
386 to force a constant to be written if and only if it is
387 defined in a main file, as opposed to an include file. */
389 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
393 node
= varpool_node::get (decl
);
395 if (!node
&& flag_ltrans
)
397 else if (node
&& node
->definition
)
399 else if (node
&& node
->alias
)
401 else if (!symtab
->global_info_ready
403 || TREE_USED (DECL_ASSEMBLER_NAME (decl
))))
405 else if (node
&& node
->analyzed
)
407 else if (DECL_COMDAT (decl
))
409 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
410 && (optimize
|| !flag_keep_static_consts
411 || DECL_ARTIFICIAL (decl
)))
416 rest_of_decl_compilation (decl
, 1, 1);
424 /* Do any final processing required for the declarations in VEC, of
425 which there are LEN. We write out inline functions and variables
426 that have been deferred until this point, but which are required.
427 Returns nonzero if anything was put out. */
430 wrapup_global_declarations (tree
*vec
, int len
)
432 bool reconsider
, output_something
= false;
435 for (i
= 0; i
< len
; i
++)
436 wrapup_global_declaration_1 (vec
[i
]);
438 /* Now emit any global variables or functions that we have been
439 putting off. We need to loop in case one of the things emitted
440 here references another one which comes earlier in the list. */
444 for (i
= 0; i
< len
; i
++)
445 reconsider
|= wrapup_global_declaration_2 (vec
[i
]);
447 output_something
= true;
451 return output_something
;
454 /* Compile an entire translation unit. Write a file of assembly
455 output and various debugging dumps. */
460 timevar_start (TV_PHASE_PARSING
);
461 timevar_push (TV_PARSE_GLOBAL
);
463 /* Parse entire file and generate initial debug information. */
464 lang_hooks
.parse_file ();
466 timevar_pop (TV_PARSE_GLOBAL
);
467 timevar_stop (TV_PHASE_PARSING
);
469 if (flag_dump_locations
)
470 dump_location_info (stderr
);
472 /* Compilation is now finished except for writing
473 what's left of the symbol table output. */
475 if (flag_syntax_only
|| flag_wpa
)
478 /* Reset maximum_field_alignment, it can be adjusted by #pragma pack
479 and this shouldn't influence any types built by the middle-end
480 from now on (like gcov_info_type). */
481 maximum_field_alignment
= initial_max_fld_align
* BITS_PER_UNIT
;
483 ggc_protect_identifiers
= false;
485 /* Run the actual compilation process. */
488 timevar_start (TV_PHASE_OPT_GEN
);
489 symtab
->finalize_compilation_unit ();
490 timevar_stop (TV_PHASE_OPT_GEN
);
493 /* Perform any post compilation-proper parser cleanups and
494 processing. This is currently only needed for the C++ parser,
495 which can be hopefully cleaned up so this hook is no longer
497 if (lang_hooks
.decls
.post_compilation_parsing_cleanups
)
498 lang_hooks
.decls
.post_compilation_parsing_cleanups ();
503 timevar_start (TV_PHASE_LATE_ASM
);
505 /* Compilation unit is finalized. When producing non-fat LTO object, we are
506 basically finished. */
507 if (in_lto_p
|| !flag_lto
|| flag_fat_lto_objects
)
509 /* File-scope initialization for AddressSanitizer. */
510 if (flag_sanitize
& SANITIZE_ADDRESS
)
513 if (flag_sanitize
& SANITIZE_THREAD
)
516 if (flag_check_pointer_bounds
)
521 output_shared_constant_pool ();
522 output_object_blocks ();
523 finish_tm_clone_pairs ();
525 /* Write out any pending weak symbol declarations. */
528 /* This must be at the end before unwind and debug info.
529 Some target ports emit PIC setup thunks here. */
530 targetm
.asm_out
.code_end ();
532 /* Do dbx symbols. */
533 timevar_push (TV_SYMOUT
);
535 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
536 if (dwarf2out_do_frame ())
537 dwarf2out_frame_finish ();
540 (*debug_hooks
->finish
) (main_input_filename
);
541 timevar_pop (TV_SYMOUT
);
543 /* Output some stuff at end of file if nec. */
545 dw2_output_indirect_constants ();
547 /* Flush any pending external directives. */
548 process_pending_assemble_externals ();
551 /* Emit LTO marker if LTO info has been previously emitted. This is
552 used by collect2 to determine whether an object file contains IL.
553 We used to emit an undefined reference here, but this produces
554 link errors if an object file with IL is stored into a shared
555 library without invoking lto1. */
556 if (flag_generate_lto
|| flag_generate_offload
)
558 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
559 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
,
561 (unsigned HOST_WIDE_INT
) 1, 8);
562 #elif defined ASM_OUTPUT_ALIGNED_COMMON
563 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_v1",
564 (unsigned HOST_WIDE_INT
) 1, 8);
566 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_v1",
567 (unsigned HOST_WIDE_INT
) 1,
568 (unsigned HOST_WIDE_INT
) 1);
572 /* Let linker plugin know that this is a slim object and must be LTOed
573 even when user did not ask for it. */
574 if (flag_generate_lto
&& !flag_fat_lto_objects
)
576 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
577 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
, "__gnu_lto_slim",
578 (unsigned HOST_WIDE_INT
) 1, 8);
579 #elif defined ASM_OUTPUT_ALIGNED_COMMON
580 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_slim",
581 (unsigned HOST_WIDE_INT
) 1, 8);
583 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_slim",
584 (unsigned HOST_WIDE_INT
) 1,
585 (unsigned HOST_WIDE_INT
) 1);
589 /* Attach a special .ident directive to the end of the file to identify
590 the version of GCC which compiled this code. The format of the .ident
591 string is patterned after the ones produced by native SVR4 compilers. */
594 const char *pkg_version
= "(GNU) ";
597 if (strcmp ("(GCC) ", pkgversion_string
))
598 pkg_version
= pkgversion_string
;
600 ident_str
= ACONCAT (("GCC: ", pkg_version
, version_string
, NULL
));
601 targetm
.asm_out
.output_ident (ident_str
);
604 /* Auto profile finalization. */
605 if (flag_auto_profile
)
608 /* Invoke registered plugin callbacks. */
609 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT
, NULL
);
611 /* This must be at the end. Some target ports emit end of file directives
612 into the assembly file here, and hence we can not output anything to the
613 assembly file after this point. */
614 targetm
.asm_out
.file_end ();
616 timevar_stop (TV_PHASE_LATE_ASM
);
619 /* Print version information to FILE.
620 Each line begins with INDENT (for the case where FILE is the
621 assembler output file).
623 If SHOW_GLOBAL_STATE is true (for cc1 etc), we are within the compiler
624 proper and can print pertinent state (e.g. params and plugins).
626 If SHOW_GLOBAL_STATE is false (for use by libgccjit), we are outside the
627 compiler, and we don't hold the mutex on the compiler's global state:
628 we can't print params and plugins, since they might not be initialized,
629 or might be being manipulated by a compile running in another
633 print_version (FILE *file
, const char *indent
, bool show_global_state
)
635 static const char fmt1
[] =
637 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
639 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
642 static const char fmt2
[] =
643 N_("GMP version %s, MPFR version %s, MPC version %s\n");
644 static const char fmt3
[] =
645 N_("%s%swarning: %s header version %s differs from library version %s.\n");
646 static const char fmt4
[] =
647 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
649 #define __VERSION__ "[?]"
652 file
== stderr
? _(fmt1
) : fmt1
,
653 indent
, *indent
!= 0 ? " " : "",
654 lang_hooks
.name
, pkgversion_string
, version_string
, TARGET_NAME
,
655 indent
, __VERSION__
);
657 /* We need to stringify the GMP macro values. Ugh, gmp_version has
658 two string formats, "i.j.k" and "i.j" when k is zero. As of
659 gmp-4.3.0, GMP always uses the 3 number format. */
660 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
661 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3 (X)
662 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
663 #define GCC_GMP_VERSION \
664 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
665 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
666 #define GCC_GMP_STRINGIFY_VERSION \
667 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
668 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR)
670 #define GCC_GMP_STRINGIFY_VERSION \
671 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
672 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR) "." \
673 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_PATCHLEVEL)
676 file
== stderr
? _(fmt2
) : fmt2
,
677 GCC_GMP_STRINGIFY_VERSION
, MPFR_VERSION_STRING
, MPC_VERSION_STRING
);
678 if (strcmp (GCC_GMP_STRINGIFY_VERSION
, gmp_version
))
680 file
== stderr
? _(fmt3
) : fmt3
,
681 indent
, *indent
!= 0 ? " " : "",
682 "GMP", GCC_GMP_STRINGIFY_VERSION
, gmp_version
);
683 if (strcmp (MPFR_VERSION_STRING
, mpfr_get_version ()))
685 file
== stderr
? _(fmt3
) : fmt3
,
686 indent
, *indent
!= 0 ? " " : "",
687 "MPFR", MPFR_VERSION_STRING
, mpfr_get_version ());
688 if (strcmp (MPC_VERSION_STRING
, mpc_get_version ()))
690 file
== stderr
? _(fmt3
) : fmt3
,
691 indent
, *indent
!= 0 ? " " : "",
692 "MPC", MPC_VERSION_STRING
, mpc_get_version ());
694 if (show_global_state
)
697 file
== stderr
? _(fmt4
) : fmt4
,
698 indent
, *indent
!= 0 ? " " : "",
699 PARAM_VALUE (GGC_MIN_EXPAND
), PARAM_VALUE (GGC_MIN_HEAPSIZE
));
701 print_plugins_versions (file
, indent
);
706 print_to_asm_out_file (print_switch_type type
, const char * text
)
708 bool prepend_sep
= true;
712 case SWITCH_TYPE_LINE_END
:
713 putc ('\n', asm_out_file
);
716 case SWITCH_TYPE_LINE_START
:
717 fputs (ASM_COMMENT_START
, asm_out_file
);
718 return strlen (ASM_COMMENT_START
);
720 case SWITCH_TYPE_DESCRIPTIVE
:
721 if (ASM_COMMENT_START
[0] == 0)
724 case SWITCH_TYPE_PASSED
:
725 case SWITCH_TYPE_ENABLED
:
727 fputc (' ', asm_out_file
);
728 fputs (text
, asm_out_file
);
729 /* No need to return the length here as
730 print_single_switch has already done it. */
739 print_to_stderr (print_switch_type type
, const char * text
)
743 case SWITCH_TYPE_LINE_END
:
747 case SWITCH_TYPE_LINE_START
:
750 case SWITCH_TYPE_PASSED
:
751 case SWITCH_TYPE_ENABLED
:
755 case SWITCH_TYPE_DESCRIPTIVE
:
756 fputs (text
, stderr
);
757 /* No need to return the length here as
758 print_single_switch has already done it. */
766 /* Print an option value and return the adjusted position in the line.
767 ??? print_fn doesn't handle errors, eg disk full; presumably other
768 code will catch a disk full though. */
771 print_single_switch (print_switch_fn_type print_fn
,
773 print_switch_type type
,
776 /* The ultrix fprintf returns 0 on success, so compute the result
777 we want here since we need it for the following test. The +1
778 is for the separator character that will probably be emitted. */
779 int len
= strlen (text
) + 1;
782 && pos
+ len
> MAX_LINE
)
784 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
789 pos
+= print_fn (SWITCH_TYPE_LINE_START
, NULL
);
791 print_fn (type
, text
);
795 /* Print active target switches using PRINT_FN.
796 POS is the current cursor position and MAX is the size of a "line".
797 Each line begins with INDENT and ends with TERM.
798 Each switch is separated from the next by SEP. */
801 print_switch_values (print_switch_fn_type print_fn
)
806 /* Fill in the -frandom-seed option, if the user didn't pass it, so
807 that it can be printed below. This helps reproducibility. */
808 if (!flag_random_seed
)
811 /* Print the options as passed. */
812 pos
= print_single_switch (print_fn
, pos
,
813 SWITCH_TYPE_DESCRIPTIVE
, _("options passed: "));
815 for (j
= 1; j
< save_decoded_options_count
; j
++)
817 switch (save_decoded_options
[j
].opt_index
)
830 pos
= print_single_switch (print_fn
, pos
, SWITCH_TYPE_PASSED
,
831 save_decoded_options
[j
].orig_option_with_args_text
);
835 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
837 /* Print the -f and -m options that have been enabled.
838 We don't handle language specific options but printing argv
840 pos
= print_single_switch (print_fn
, 0,
841 SWITCH_TYPE_DESCRIPTIVE
, _("options enabled: "));
843 for (j
= 0; j
< cl_options_count
; j
++)
844 if (cl_options
[j
].cl_report
845 && option_enabled (j
, &global_options
) > 0)
846 pos
= print_single_switch (print_fn
, pos
,
847 SWITCH_TYPE_ENABLED
, cl_options
[j
].opt_text
);
849 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
852 /* Open assembly code output file. Do this even if -fsyntax-only is
853 on, because then the driver will have provided the name of a
854 temporary file or bit bucket for us. NAME is the file specified on
855 the command line, possibly NULL. */
857 init_asm_output (const char *name
)
859 if (name
== NULL
&& asm_file_name
== 0)
860 asm_out_file
= stdout
;
863 if (asm_file_name
== 0)
865 int len
= strlen (dump_base_name
);
866 char *dumpname
= XNEWVEC (char, len
+ 6);
868 memcpy (dumpname
, dump_base_name
, len
+ 1);
869 strip_off_ending (dumpname
, len
);
870 strcat (dumpname
, ".s");
871 asm_file_name
= dumpname
;
873 if (!strcmp (asm_file_name
, "-"))
874 asm_out_file
= stdout
;
875 else if (!canonical_filename_eq (asm_file_name
, name
)
876 || !strcmp (asm_file_name
, HOST_BIT_BUCKET
))
877 asm_out_file
= fopen (asm_file_name
, "w");
879 /* Use UNKOWN_LOCATION to prevent gcc from printing the first
880 line in the current file. */
881 fatal_error (UNKNOWN_LOCATION
,
882 "input file %qs is the same as output file",
884 if (asm_out_file
== 0)
885 fatal_error (UNKNOWN_LOCATION
,
886 "can%'t open %qs for writing: %m", asm_file_name
);
889 if (!flag_syntax_only
)
891 targetm
.asm_out
.file_start ();
893 if (flag_record_gcc_switches
)
895 if (targetm
.asm_out
.record_gcc_switches
)
897 /* Let the target know that we are about to start recording. */
898 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
900 /* Now record the switches. */
901 print_switch_values (targetm
.asm_out
.record_gcc_switches
);
902 /* Let the target know that the recording is over. */
903 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
907 inform (input_location
, "-frecord-gcc-switches is not supported by the current target");
910 if (flag_verbose_asm
)
912 /* Print the list of switches in effect
913 into the assembler file as comments. */
914 print_version (asm_out_file
, ASM_COMMENT_START
, true);
915 print_switch_values (print_to_asm_out_file
);
916 putc ('\n', asm_out_file
);
921 /* A helper function; used as the reallocator function for cpp's line
924 realloc_for_line_map (void *ptr
, size_t len
)
926 return ggc_realloc (ptr
, len
);
929 /* A helper function: used as the allocator function for
930 identifier_to_locale. */
932 alloc_for_identifier_to_locale (size_t len
)
934 return ggc_alloc_atomic (len
);
937 /* Output stack usage information. */
939 output_stack_usage (void)
941 static bool warning_issued
= false;
942 enum stack_usage_kind_type
{ STATIC
= 0, DYNAMIC
, DYNAMIC_BOUNDED
};
943 const char *stack_usage_kind_str
[] = {
948 HOST_WIDE_INT stack_usage
= current_function_static_stack_size
;
949 enum stack_usage_kind_type stack_usage_kind
;
955 warning (0, "stack usage computation not supported for this target");
956 warning_issued
= true;
961 stack_usage_kind
= STATIC
;
963 /* Add the maximum amount of space pushed onto the stack. */
964 if (current_function_pushed_stack_size
> 0)
966 stack_usage
+= current_function_pushed_stack_size
;
967 stack_usage_kind
= DYNAMIC_BOUNDED
;
970 /* Now on to the tricky part: dynamic stack allocation. */
971 if (current_function_allocates_dynamic_stack_space
)
973 if (current_function_has_unbounded_dynamic_stack_size
)
974 stack_usage_kind
= DYNAMIC
;
976 stack_usage_kind
= DYNAMIC_BOUNDED
;
978 /* Add the size even in the unbounded case, this can't hurt. */
979 stack_usage
+= current_function_dynamic_stack_size
;
982 if (flag_stack_usage
)
984 expanded_location loc
985 = expand_location (DECL_SOURCE_LOCATION (current_function_decl
));
986 /* We don't want to print the full qualified name because it can be long,
987 so we strip the scope prefix, but we may need to deal with the suffix
988 created by the compiler. */
990 = strchr (IDENTIFIER_POINTER (DECL_NAME (current_function_decl
)), '.');
992 = lang_hooks
.decl_printable_name (current_function_decl
, 2);
995 const char *dot
= strchr (name
, '.');
996 while (dot
&& strcasecmp (dot
, suffix
) != 0)
999 dot
= strchr (name
, '.');
1004 const char *dot
= strrchr (name
, '.');
1009 fprintf (stack_usage_file
,
1010 "%s:%d:%d:%s\t" HOST_WIDE_INT_PRINT_DEC
"\t%s\n",
1011 lbasename (loc
.file
),
1016 stack_usage_kind_str
[stack_usage_kind
]);
1019 if (warn_stack_usage
>= 0)
1021 const location_t loc
= DECL_SOURCE_LOCATION (current_function_decl
);
1023 if (stack_usage_kind
== DYNAMIC
)
1024 warning_at (loc
, OPT_Wstack_usage_
, "stack usage might be unbounded");
1025 else if (stack_usage
> warn_stack_usage
)
1027 if (stack_usage_kind
== DYNAMIC_BOUNDED
)
1029 OPT_Wstack_usage_
, "stack usage might be %wd bytes",
1032 warning_at (loc
, OPT_Wstack_usage_
, "stack usage is %wd bytes",
1038 /* Open an auxiliary output file. */
1040 open_auxiliary_file (const char *ext
)
1045 filename
= concat (aux_base_name
, ".", ext
, NULL
);
1046 file
= fopen (filename
, "w");
1048 fatal_error (input_location
, "can%'t open %s for writing: %m", filename
);
1053 /* Initialization of the front end environment, before command line
1054 options are parsed. Signal handlers, internationalization etc.
1055 ARGV0 is main's argv[0]. */
1057 general_init (const char *argv0
, bool init_signals
)
1061 p
= argv0
+ strlen (argv0
);
1062 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
1066 xmalloc_set_program_name (progname
);
1070 /* Unlock the stdio streams. */
1071 unlock_std_streams ();
1073 gcc_init_libintl ();
1075 identifier_to_locale_alloc
= alloc_for_identifier_to_locale
;
1076 identifier_to_locale_free
= ggc_free
;
1078 /* Initialize the diagnostics reporting machinery, so option parsing
1079 can give warnings and errors. */
1080 diagnostic_initialize (global_dc
, N_OPTS
);
1081 /* Set a default printer. Language specific initializations will
1082 override it later. */
1083 tree_diagnostics_defaults (global_dc
);
1085 global_dc
->show_caret
1086 = global_options_init
.x_flag_diagnostics_show_caret
;
1087 global_dc
->show_option_requested
1088 = global_options_init
.x_flag_diagnostics_show_option
;
1089 global_dc
->show_column
1090 = global_options_init
.x_flag_show_column
;
1091 global_dc
->internal_error
= plugins_internal_error_function
;
1092 global_dc
->option_enabled
= option_enabled
;
1093 global_dc
->option_state
= &global_options
;
1094 global_dc
->option_name
= option_name
;
1098 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1100 signal (SIGSEGV
, crash_signal
);
1103 signal (SIGILL
, crash_signal
);
1106 signal (SIGBUS
, crash_signal
);
1109 signal (SIGABRT
, crash_signal
);
1111 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1112 signal (SIGIOT
, crash_signal
);
1115 signal (SIGFPE
, crash_signal
);
1118 /* Other host-specific signal setup. */
1119 (*host_hooks
.extra_signals
)();
1122 /* Initialize the garbage-collector, string pools and tree type hash
1126 input_location
= UNKNOWN_LOCATION
;
1127 line_table
= ggc_alloc
<line_maps
> ();
1128 linemap_init (line_table
, BUILTINS_LOCATION
);
1129 line_table
->reallocator
= realloc_for_line_map
;
1130 line_table
->round_alloc_size
= ggc_round_alloc_size
;
1131 line_table
->default_range_bits
= 5;
1134 /* Initialize register usage now so switches may override. */
1137 /* Register the language-independent parameters. */
1138 global_init_params ();
1140 /* This must be done after global_init_params but before argument
1142 init_ggc_heuristics ();
1144 /* Create the singleton holder for global state.
1145 Doing so also creates the pass manager and with it the passes. */
1146 g
= new gcc::context ();
1147 symtab
= new (ggc_cleared_alloc
<symbol_table
> ()) symbol_table ();
1149 statistics_early_init ();
1153 /* Return true if the current target supports -fsection-anchors. */
1156 target_supports_section_anchors_p (void)
1158 if (targetm
.min_anchor_offset
== 0 && targetm
.max_anchor_offset
== 0)
1161 if (targetm
.asm_out
.output_anchor
== NULL
)
1167 /* Default the align_* variables to 1 if they're still unset, and
1168 set up the align_*_log variables. */
1170 init_alignments (void)
1172 if (align_loops
<= 0)
1174 if (align_loops_max_skip
> align_loops
)
1175 align_loops_max_skip
= align_loops
- 1;
1176 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
1177 if (align_jumps
<= 0)
1179 if (align_jumps_max_skip
> align_jumps
)
1180 align_jumps_max_skip
= align_jumps
- 1;
1181 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
1182 if (align_labels
<= 0)
1184 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
1185 if (align_labels_max_skip
> align_labels
)
1186 align_labels_max_skip
= align_labels
- 1;
1187 if (align_functions
<= 0)
1188 align_functions
= 1;
1189 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
1192 /* Process the options that have been parsed. */
1194 process_options (void)
1196 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1197 This can happen with incorrect pre-processed input. */
1198 debug_hooks
= &do_nothing_debug_hooks
;
1200 maximum_field_alignment
= initial_max_fld_align
* BITS_PER_UNIT
;
1202 /* Allow the front end to perform consistency checks and do further
1203 initialization based on the command line options. This hook also
1204 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1205 so we can correctly initialize debug output. */
1206 no_backend
= lang_hooks
.post_options (&main_input_filename
);
1208 /* Some machines may reject certain combinations of options. */
1209 targetm
.target_option
.override ();
1211 /* Avoid any informative notes in the second run of -fcompare-debug. */
1212 if (flag_compare_debug
)
1213 diagnostic_inhibit_notes (global_dc
);
1215 if (flag_section_anchors
&& !target_supports_section_anchors_p ())
1217 warning (OPT_fsection_anchors
,
1218 "this target does not support %qs", "-fsection-anchors");
1219 flag_section_anchors
= 0;
1222 if (flag_short_enums
== 2)
1223 flag_short_enums
= targetm
.default_short_enums ();
1225 /* Set aux_base_name if not already set. */
1228 else if (main_input_filename
)
1230 char *name
= xstrdup (lbasename (main_input_filename
));
1232 strip_off_ending (name
, strlen (name
));
1233 aux_base_name
= name
;
1236 aux_base_name
= "gccaux";
1240 || flag_loop_optimize_isl
1241 || flag_graphite_identity
1242 || flag_loop_parallelize_all
)
1243 sorry ("Graphite loop optimizations cannot be used (ISL is not available)"
1244 "(-fgraphite, -fgraphite-identity, -floop-block, "
1245 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1246 "-floop-unroll-and-jam, and -ftree-loop-linear)");
1249 if (flag_check_pointer_bounds
)
1251 if (targetm
.chkp_bound_mode () == VOIDmode
)
1253 error ("-fcheck-pointer-bounds is not supported for this target");
1254 flag_check_pointer_bounds
= 0;
1257 if (flag_sanitize
& SANITIZE_ADDRESS
)
1259 error ("-fcheck-pointer-bounds is not supported with "
1260 "Address Sanitizer");
1261 flag_check_pointer_bounds
= 0;
1265 /* One region RA really helps to decrease the code size. */
1266 if (flag_ira_region
== IRA_REGION_AUTODETECT
)
1268 = optimize_size
|| !optimize
? IRA_REGION_ONE
: IRA_REGION_MIXED
;
1270 if (!abi_version_at_least (2))
1272 /* -fabi-version=1 support was removed after GCC 4.9. */
1273 error ("%<-fabi-version=1%> is no longer supported");
1274 flag_abi_version
= 2;
1277 /* Unrolling all loops implies that standard loop unrolling must also
1279 if (flag_unroll_all_loops
)
1280 flag_unroll_loops
= 1;
1282 /* web and rename-registers help when run after loop unrolling. */
1283 if (flag_web
== AUTODETECT_VALUE
)
1284 flag_web
= flag_unroll_loops
|| flag_peel_loops
;
1286 if (flag_rename_registers
== AUTODETECT_VALUE
)
1287 flag_rename_registers
= flag_unroll_loops
|| flag_peel_loops
;
1289 if (flag_non_call_exceptions
)
1290 flag_asynchronous_unwind_tables
= 1;
1291 if (flag_asynchronous_unwind_tables
)
1292 flag_unwind_tables
= 1;
1294 if (flag_value_profile_transformations
)
1295 flag_profile_values
= 1;
1297 /* Warn about options that are not supported on this machine. */
1298 #ifndef INSN_SCHEDULING
1299 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
1300 warning (0, "instruction scheduling not supported on this target machine");
1302 if (!DELAY_SLOTS
&& flag_delayed_branch
)
1303 warning (0, "this target machine does not have delayed branches");
1305 user_label_prefix
= USER_LABEL_PREFIX
;
1306 if (flag_leading_underscore
!= -1)
1308 /* If the default prefix is more complicated than "" or "_",
1309 issue a warning and ignore this option. */
1310 if (user_label_prefix
[0] == 0 ||
1311 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
1313 user_label_prefix
= flag_leading_underscore
? "_" : "";
1316 warning (0, "-f%sleading-underscore not supported on this target machine",
1317 flag_leading_underscore
? "" : "no-");
1320 /* If we are in verbose mode, write out the version and maybe all the
1321 option flags in use. */
1324 print_version (stderr
, "", true);
1326 print_switch_values (print_to_stderr
);
1329 if (flag_syntax_only
)
1331 write_symbols
= NO_DEBUG
;
1337 if (debug_info_level
== DINFO_LEVEL_NONE
)
1339 debug_info_level
= DINFO_LEVEL_NORMAL
;
1341 if (write_symbols
== NO_DEBUG
)
1342 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
1345 debug_info_level
= DINFO_LEVEL_NONE
;
1348 if (flag_dump_final_insns
&& !flag_syntax_only
&& !no_backend
)
1350 FILE *final_output
= fopen (flag_dump_final_insns
, "w");
1353 error ("could not open final insn dump file %qs: %m",
1354 flag_dump_final_insns
);
1355 flag_dump_final_insns
= NULL
;
1357 else if (fclose (final_output
))
1359 error ("could not close zeroed insn dump file %qs: %m",
1360 flag_dump_final_insns
);
1361 flag_dump_final_insns
= NULL
;
1365 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1367 if (debug_info_level
== DINFO_LEVEL_NONE
)
1368 write_symbols
= NO_DEBUG
;
1370 if (write_symbols
== NO_DEBUG
)
1372 #if defined(DBX_DEBUGGING_INFO)
1373 else if (write_symbols
== DBX_DEBUG
)
1374 debug_hooks
= &dbx_debug_hooks
;
1376 #if defined(XCOFF_DEBUGGING_INFO)
1377 else if (write_symbols
== XCOFF_DEBUG
)
1378 debug_hooks
= &xcoff_debug_hooks
;
1380 else if (SDB_DEBUGGING_INFO
&& write_symbols
== SDB_DEBUG
)
1381 debug_hooks
= &sdb_debug_hooks
;
1382 #ifdef DWARF2_DEBUGGING_INFO
1383 else if (write_symbols
== DWARF2_DEBUG
)
1384 debug_hooks
= &dwarf2_debug_hooks
;
1386 #ifdef VMS_DEBUGGING_INFO
1387 else if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1388 debug_hooks
= &vmsdbg_debug_hooks
;
1390 #ifdef DWARF2_LINENO_DEBUGGING_INFO
1391 else if (write_symbols
== DWARF2_DEBUG
)
1392 debug_hooks
= &dwarf2_lineno_debug_hooks
;
1395 error ("target system does not support the %qs debug format",
1396 debug_type_names
[write_symbols
]);
1398 /* We know which debug output will be used so we can set flag_var_tracking
1399 and flag_var_tracking_uninit if the user has not specified them. */
1400 if (debug_info_level
< DINFO_LEVEL_NORMAL
1401 || debug_hooks
->var_location
== do_nothing_debug_hooks
.var_location
)
1403 if (flag_var_tracking
== 1
1404 || flag_var_tracking_uninit
== 1)
1406 if (debug_info_level
< DINFO_LEVEL_NORMAL
)
1407 warning (0, "variable tracking requested, but useless unless "
1408 "producing debug info");
1410 warning (0, "variable tracking requested, but not supported "
1411 "by this debug format");
1413 flag_var_tracking
= 0;
1414 flag_var_tracking_uninit
= 0;
1417 /* The debug hooks are used to implement -fdump-go-spec because it
1418 gives a simple and stable API for all the information we need to
1420 if (flag_dump_go_spec
!= NULL
)
1421 debug_hooks
= dump_go_spec_init (flag_dump_go_spec
, debug_hooks
);
1423 /* If the user specifically requested variable tracking with tagging
1424 uninitialized variables, we need to turn on variable tracking.
1425 (We already determined above that variable tracking is feasible.) */
1426 if (flag_var_tracking_uninit
== 1)
1427 flag_var_tracking
= 1;
1429 if (flag_var_tracking
== AUTODETECT_VALUE
)
1430 flag_var_tracking
= optimize
>= 1;
1432 if (flag_var_tracking_uninit
== AUTODETECT_VALUE
)
1433 flag_var_tracking_uninit
= flag_var_tracking
;
1435 if (flag_var_tracking_assignments
== AUTODETECT_VALUE
)
1436 flag_var_tracking_assignments
= flag_var_tracking
1437 && !(flag_selective_scheduling
|| flag_selective_scheduling2
);
1439 if (flag_var_tracking_assignments_toggle
)
1440 flag_var_tracking_assignments
= !flag_var_tracking_assignments
;
1442 if (flag_var_tracking_assignments
&& !flag_var_tracking
)
1443 flag_var_tracking
= flag_var_tracking_assignments
= -1;
1445 if (flag_var_tracking_assignments
1446 && (flag_selective_scheduling
|| flag_selective_scheduling2
))
1447 warning (0, "var-tracking-assignments changes selective scheduling");
1449 if (flag_tree_cselim
== AUTODETECT_VALUE
)
1451 if (HAVE_conditional_move
)
1452 flag_tree_cselim
= 1;
1454 flag_tree_cselim
= 0;
1457 /* If auxiliary info generation is desired, open the output file.
1458 This goes in the same directory as the source file--unlike
1459 all the other output files. */
1460 if (flag_gen_aux_info
)
1462 aux_info_file
= fopen (aux_info_file_name
, "w");
1463 if (aux_info_file
== 0)
1464 fatal_error (input_location
, "can%'t open %s: %m", aux_info_file_name
);
1467 if (!targetm_common
.have_named_sections
)
1469 if (flag_function_sections
)
1471 warning (0, "-ffunction-sections not supported for this target");
1472 flag_function_sections
= 0;
1474 if (flag_data_sections
)
1476 warning (0, "-fdata-sections not supported for this target");
1477 flag_data_sections
= 0;
1481 if (flag_prefetch_loop_arrays
> 0 && !targetm
.code_for_prefetch
)
1483 warning (0, "-fprefetch-loop-arrays not supported for this target");
1484 flag_prefetch_loop_arrays
= 0;
1486 else if (flag_prefetch_loop_arrays
> 0 && !targetm
.have_prefetch ())
1488 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1489 flag_prefetch_loop_arrays
= 0;
1492 /* This combination of options isn't handled for i386 targets and doesn't
1493 make much sense anyway, so don't allow it. */
1494 if (flag_prefetch_loop_arrays
> 0 && optimize_size
)
1496 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1497 flag_prefetch_loop_arrays
= 0;
1500 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1501 if (flag_signaling_nans
)
1502 flag_trapping_math
= 1;
1504 /* We cannot reassociate if we want traps or signed zeros. */
1505 if (flag_associative_math
&& (flag_trapping_math
|| flag_signed_zeros
))
1507 warning (0, "-fassociative-math disabled; other options take precedence");
1508 flag_associative_math
= 0;
1511 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1512 if (flag_cx_limited_range
)
1513 flag_complex_method
= 0;
1515 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1516 if (flag_cx_fortran_rules
)
1517 flag_complex_method
= 1;
1519 /* Targets must be able to place spill slots at lower addresses. If the
1520 target already uses a soft frame pointer, the transition is trivial. */
1521 if (!FRAME_GROWS_DOWNWARD
&& flag_stack_protect
)
1523 warning (0, "-fstack-protector not supported for this target");
1524 flag_stack_protect
= 0;
1526 if (!flag_stack_protect
)
1527 warn_stack_protect
= 0;
1529 /* Address Sanitizer needs porting to each target architecture. */
1531 if ((flag_sanitize
& SANITIZE_ADDRESS
)
1532 && !FRAME_GROWS_DOWNWARD
)
1535 "-fsanitize=address and -fsanitize=kernel-address "
1536 "are not supported for this target");
1537 flag_sanitize
&= ~SANITIZE_ADDRESS
;
1540 if ((flag_sanitize
& SANITIZE_USER_ADDRESS
)
1541 && targetm
.asan_shadow_offset
== NULL
)
1543 warning (0, "-fsanitize=address not supported for this target");
1544 flag_sanitize
&= ~SANITIZE_ADDRESS
;
1547 /* Do not use IPA optimizations for register allocation if profiler is active
1548 or port does not emit prologue and epilogue as RTL. */
1549 if (profile_flag
|| !targetm
.have_prologue () || !targetm
.have_epilogue ())
1552 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1553 have not been set. */
1554 if (!global_options_set
.x_warnings_are_errors
1555 && warn_coverage_mismatch
1556 && (global_dc
->classify_diagnostic
[OPT_Wcoverage_mismatch
] ==
1558 diagnostic_classify_diagnostic (global_dc
, OPT_Wcoverage_mismatch
,
1559 DK_ERROR
, UNKNOWN_LOCATION
);
1561 /* Save the current optimization options. */
1562 optimization_default_node
= build_optimization_node (&global_options
);
1563 optimization_current_node
= optimization_default_node
;
1565 /* Please don't change global_options after this point, those changes won't
1566 be reflected in optimization_{default,current}_node. */
1569 /* This function can be called multiple times to reinitialize the compiler
1570 back end when register classes or instruction sets have changed,
1571 before each function. */
1573 backend_init_target (void)
1575 /* Initialize alignment variables. */
1578 /* This depends on stack_pointer_rtx. */
1579 init_fake_stack_mems ();
1581 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1583 init_alias_target ();
1585 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1588 /* Depends on the enabled attribute. */
1591 /* The following initialization functions need to generate rtl, so
1592 provide a dummy function context for them. */
1593 init_dummy_function_start ();
1595 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1596 on a mode change. */
1598 init_lower_subreg ();
1601 init_expr_target ();
1604 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1605 after a mode change as well. */
1606 caller_save_initialized_p
= false;
1608 expand_dummy_function_end ();
1611 /* Initialize the compiler back end. This function is called only once,
1612 when starting the compiler. */
1619 init_inline_once ();
1620 init_varasm_once ();
1621 save_register_info ();
1623 /* Middle end needs this initialization for default mem attributes
1624 used by early calls to make_decl_rtl. */
1627 /* Middle end needs this initialization for mode tables used to assign
1628 modes to vector variables. */
1632 /* Initialize excess precision settings. */
1634 init_excess_precision (void)
1636 /* Adjust excess precision handling based on the target options. If
1637 the front end cannot handle it, flag_excess_precision_cmdline
1638 will already have been set accordingly in the post_options
1640 gcc_assert (flag_excess_precision_cmdline
!= EXCESS_PRECISION_DEFAULT
);
1641 flag_excess_precision
= flag_excess_precision_cmdline
;
1642 if (flag_unsafe_math_optimizations
)
1643 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1644 if (flag_excess_precision
== EXCESS_PRECISION_STANDARD
)
1646 int flt_eval_method
= TARGET_FLT_EVAL_METHOD
;
1647 switch (flt_eval_method
)
1651 /* Either the target acts unpredictably (-1) or has all the
1652 operations required not to have excess precision (0). */
1653 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1657 /* In these cases, predictable excess precision makes
1661 /* Any other implementation-defined FLT_EVAL_METHOD values
1662 require the compiler to handle the associated excess
1663 precision rules in excess_precision_type. */
1669 /* Initialize things that are both lang-dependent and target-dependent.
1670 This function can be called more than once if target parameters change. */
1672 lang_dependent_init_target (void)
1674 /* This determines excess precision settings. */
1675 init_excess_precision ();
1677 /* This creates various _DECL nodes, so needs to be called after the
1678 front end is initialized. It also depends on the HAVE_xxx macros
1679 generated from the target machine description. */
1682 gcc_assert (!this_target_rtl
->target_specific_initialized
);
1685 /* Perform initializations that are lang-dependent or target-dependent.
1686 but matters only for late optimizations and RTL generation. */
1688 static int rtl_initialized
;
1691 initialize_rtl (void)
1693 auto_timevar
tv (g_timer
, TV_INITIALIZE_RTL
);
1695 /* Initialization done just once per compilation, but delayed
1696 till code generation. */
1697 if (!rtl_initialized
)
1699 rtl_initialized
= true;
1701 /* Target specific RTL backend initialization. */
1702 if (!this_target_rtl
->target_specific_initialized
)
1704 backend_init_target ();
1705 this_target_rtl
->target_specific_initialized
= true;
1709 /* Language-dependent initialization. Returns nonzero on success. */
1711 lang_dependent_init (const char *name
)
1713 location_t save_loc
= input_location
;
1714 if (dump_base_name
== 0)
1715 dump_base_name
= name
&& name
[0] ? name
: "gccdump";
1717 /* Other front-end initialization. */
1718 input_location
= BUILTINS_LOCATION
;
1719 if (lang_hooks
.init () == 0)
1721 input_location
= save_loc
;
1725 init_asm_output (name
);
1727 /* If stack usage information is desired, open the output file. */
1728 if (flag_stack_usage
)
1729 stack_usage_file
= open_auxiliary_file ("su");
1732 /* This creates various _DECL nodes, so needs to be called after the
1733 front end is initialized. */
1736 /* Do the target-specific parts of the initialization. */
1737 lang_dependent_init_target ();
1741 /* If dbx symbol table desired, initialize writing it and output the
1742 predefined types. */
1743 timevar_push (TV_SYMOUT
);
1745 /* Now we have the correct original filename, we can initialize
1747 (*debug_hooks
->init
) (name
);
1749 timevar_pop (TV_SYMOUT
);
1756 /* Reinitialize everything when target parameters, such as register usage,
1759 target_reinit (void)
1761 struct rtl_data saved_x_rtl
;
1762 rtx
*saved_regno_reg_rtx
;
1763 tree saved_optimization_current_node
;
1764 struct target_optabs
*saved_this_fn_optabs
;
1766 /* Temporarily switch to the default optimization node, so that
1767 *this_target_optabs is set to the default, not reflecting
1768 whatever a previous function used for the optimize
1770 saved_optimization_current_node
= optimization_current_node
;
1771 saved_this_fn_optabs
= this_fn_optabs
;
1772 if (saved_optimization_current_node
!= optimization_default_node
)
1774 optimization_current_node
= optimization_default_node
;
1775 cl_optimization_restore
1777 TREE_OPTIMIZATION (optimization_default_node
));
1779 this_fn_optabs
= this_target_optabs
;
1781 /* Save *crtl and regno_reg_rtx around the reinitialization
1782 to allow target_reinit being called even after prepare_function_start. */
1783 saved_regno_reg_rtx
= regno_reg_rtx
;
1784 if (saved_regno_reg_rtx
)
1786 saved_x_rtl
= *crtl
;
1787 memset (crtl
, '\0', sizeof (*crtl
));
1788 regno_reg_rtx
= NULL
;
1791 this_target_rtl
->target_specific_initialized
= false;
1793 /* This initializes hard_frame_pointer, and calls init_reg_modes_target()
1794 to initialize reg_raw_mode[]. */
1797 /* This invokes target hooks to set fixed_reg[] etc, which is
1801 /* Reinitialize lang-dependent parts. */
1802 lang_dependent_init_target ();
1804 /* Restore the original optimization node. */
1805 if (saved_optimization_current_node
!= optimization_default_node
)
1807 optimization_current_node
= saved_optimization_current_node
;
1808 cl_optimization_restore (&global_options
,
1809 TREE_OPTIMIZATION (optimization_current_node
));
1811 this_fn_optabs
= saved_this_fn_optabs
;
1813 /* Restore regno_reg_rtx at the end, as free_after_compilation from
1814 expand_dummy_function_end clears it. */
1815 if (saved_regno_reg_rtx
)
1817 *crtl
= saved_x_rtl
;
1818 regno_reg_rtx
= saved_regno_reg_rtx
;
1819 saved_regno_reg_rtx
= NULL
;
1824 dump_memory_report (bool final
)
1826 dump_line_table_statistics ();
1827 ggc_print_statistics ();
1828 stringpool_statistics ();
1829 dump_tree_statistics ();
1830 dump_gimple_statistics ();
1831 dump_rtx_statistics ();
1832 dump_alloc_pool_statistics ();
1833 dump_bitmap_statistics ();
1834 dump_hash_table_loc_statistics ();
1835 dump_vec_loc_statistics ();
1836 dump_ggc_loc_statistics (final
);
1837 dump_alias_stats (stderr
);
1838 dump_pta_stats (stderr
);
1841 /* Clean up: close opened files, etc. */
1844 finalize (bool no_backend
)
1846 /* Close the dump files. */
1847 if (flag_gen_aux_info
)
1849 fclose (aux_info_file
);
1851 unlink (aux_info_file_name
);
1854 /* Close non-debugging input and output files. Take special care to note
1855 whether fclose returns an error, since the pages might still be on the
1856 buffer chain while the file is open. */
1860 if (ferror (asm_out_file
) != 0)
1861 fatal_error (input_location
, "error writing to %s: %m", asm_file_name
);
1862 if (fclose (asm_out_file
) != 0)
1863 fatal_error (input_location
, "error closing %s: %m", asm_file_name
);
1866 if (stack_usage_file
)
1867 fclose (stack_usage_file
);
1873 g
->get_passes ()->finish_optimization_passes ();
1879 dump_memory_report (true);
1882 dump_profile_report ();
1884 /* Language-specific end of compilation actions. */
1885 lang_hooks
.finish ();
1889 standard_type_bitsize (int bitsize
)
1891 /* As a special exception, we always want __int128 enabled if possible. */
1894 if (bitsize
== CHAR_TYPE_SIZE
1895 || bitsize
== SHORT_TYPE_SIZE
1896 || bitsize
== INT_TYPE_SIZE
1897 || bitsize
== LONG_TYPE_SIZE
1898 || bitsize
== LONG_LONG_TYPE_SIZE
)
1903 /* Initialize the compiler, and compile the input file. */
1909 /* Don't do any more if an error has already occurred. */
1914 timevar_start (TV_PHASE_SETUP
);
1916 /* This must be run always, because it is needed to compute the FP
1917 predefined macros, such as __LDBL_MAX__, for targets using non
1918 default FP formats. */
1919 init_adjust_machine_modes ();
1920 init_derived_machine_modes ();
1922 /* This must happen after the backend has a chance to process
1923 command line options, but before the parsers are
1925 for (i
= 0; i
< NUM_INT_N_ENTS
; i
++)
1926 if (targetm
.scalar_mode_supported_p (int_n_data
[i
].m
)
1927 && ! standard_type_bitsize (int_n_data
[i
].bitsize
))
1928 int_n_enabled_p
[i
] = true;
1930 int_n_enabled_p
[i
] = false;
1932 /* Set up the back-end if requested. */
1936 /* Language-dependent initialization. Returns true on success. */
1937 if (lang_dependent_init (main_input_filename
))
1939 /* Initialize yet another pass. */
1941 ggc_protect_identifiers
= true;
1943 symtab
->initialize ();
1944 init_final (main_input_filename
);
1945 coverage_init (aux_base_name
);
1947 invoke_plugin_callbacks (PLUGIN_START_UNIT
, NULL
);
1949 timevar_stop (TV_PHASE_SETUP
);
1955 timevar_stop (TV_PHASE_SETUP
);
1958 timevar_start (TV_PHASE_FINALIZE
);
1960 finalize (no_backend
);
1962 timevar_stop (TV_PHASE_FINALIZE
);
1966 toplev::toplev (timer
*external_timer
,
1968 : m_use_TV_TOTAL (external_timer
== NULL
),
1969 m_init_signals (init_signals
)
1972 g_timer
= external_timer
;
1977 if (g_timer
&& m_use_TV_TOTAL
)
1979 g_timer
->stop (TV_TOTAL
);
1980 g_timer
->print (stderr
);
1986 /* Potentially call timevar_init (which will create g_timevars if it
1987 doesn't already exist). */
1990 toplev::start_timevars ()
1992 if (time_report
|| !quiet_flag
|| flag_detailed_statistics
)
1995 timevar_start (TV_TOTAL
);
1998 /* Entry point of cc1, cc1plus, jc1, f771, etc.
1999 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2000 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2002 It is not safe to call this function more than once. */
2005 toplev::main (int argc
, char **argv
)
2007 /* Parsing and gimplification sometimes need quite large stack.
2008 Increase stack size limits if possible. */
2009 stack_limit_increase (64 * 1024 * 1024);
2011 expandargv (&argc
, &argv
);
2013 /* Initialization of GCC's environment, and diagnostics. */
2014 general_init (argv
[0], m_init_signals
);
2016 /* One-off initialization of options that does not need to be
2017 repeated when options are added for particular functions. */
2018 init_options_once ();
2020 /* Initialize global options structures; this must be repeated for
2021 each structure used for parsing options. */
2022 init_options_struct (&global_options
, &global_options_set
);
2023 lang_hooks
.init_options_struct (&global_options
);
2025 /* Convert the options to an array. */
2026 decode_cmdline_options_to_array_default_mask (argc
,
2027 CONST_CAST2 (const char **,
2029 &save_decoded_options
,
2030 &save_decoded_options_count
);
2032 /* Perform language-specific options initialization. */
2033 lang_hooks
.init_options (save_decoded_options_count
, save_decoded_options
);
2035 /* Parse the options and do minimal processing; basically just
2036 enough to default flags appropriately. */
2037 decode_options (&global_options
, &global_options_set
,
2038 save_decoded_options
, save_decoded_options_count
,
2039 UNKNOWN_LOCATION
, global_dc
);
2041 handle_common_deferred_options ();
2045 initialize_plugins ();
2048 print_version (stderr
, "", true);
2051 print_plugins_help (stderr
, "");
2053 /* Exit early if we can (e.g. -help). */
2054 if (!exit_after_options
)
2061 if (warningcount
|| errorcount
|| werrorcount
)
2062 print_ignored_options ();
2064 /* Invoke registered plugin callbacks if any. Some plugins could
2065 emit some diagnostics here. */
2066 invoke_plugin_callbacks (PLUGIN_FINISH
, NULL
);
2068 diagnostic_finish (global_dc
);
2070 finalize_plugins ();
2071 location_adhoc_data_fini (line_table
);
2072 if (seen_error () || werrorcount
)
2073 return (FATAL_EXIT_CODE
);
2075 return (SUCCESS_EXIT_CODE
);
2078 /* For those that want to, this function aims to clean up enough state that
2079 you can call toplev::main again. */
2081 toplev::finalize (void)
2083 rtl_initialized
= false;
2084 this_target_rtl
->target_specific_initialized
= false;
2086 /* Needs to be called before cgraph_c_finalize since it uses symtab. */
2087 ipa_reference_c_finalize ();
2089 cgraph_c_finalize ();
2090 cgraphunit_c_finalize ();
2091 dwarf2out_c_finalize ();
2093 ipa_cp_c_finalize ();
2094 ira_costs_c_finalize ();
2095 params_c_finalize ();
2097 finalize_options_struct (&global_options
);
2098 finalize_options_struct (&global_options_set
);
2100 XDELETEVEC (save_decoded_options
);
2102 /* Clean up the context (and pass_manager etc). */
2106 obstack_free (&opts_obstack
, NULL
);