1 /* Top level of GCC compilers (cc1, cc1plus, etc.)
2 Copyright (C) 1987-2014 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 "tree-inline.h"
34 #include "realmpfr.h" /* For GMP/MPFR/MPC versions, in print_version. */
39 #include "insn-attr.h"
40 #include "insn-config.h"
41 #include "insn-flags.h"
42 #include "hard-reg-set.h"
56 #include "diagnostic.h"
57 #include "tree-diagnostic.h"
58 #include "tree-pretty-print.h"
63 #include "dwarf2asm.h"
66 #include "common/common-target.h"
67 #include "langhooks.h"
68 #include "cfgloop.h" /* for init_set_costs */
69 #include "hosthooks.h"
71 #include "basic-block.h"
74 #include "plugin-api.h"
78 #include "opts-diagnostic.h"
80 #include "value-prof.h"
81 #include "alloc-pool.h"
84 #include "tree-ssa-alias.h"
85 #include "internal-fn.h"
86 #include "gimple-expr.h"
89 #include "diagnostic-color.h"
91 #include "pass_manager.h"
92 #include "auto-profile.h"
93 #include "dwarf2out.h"
95 #include "ipa-reference.h"
98 #include "insn-codes.h"
100 #include "tree-chkp.h"
102 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
106 #ifdef SDB_DEBUGGING_INFO
110 #ifdef XCOFF_DEBUGGING_INFO
111 #include "xcoffout.h" /* Needed for external data
112 declarations for e.g. AIX 4.x. */
117 static void general_init (const char *);
118 static void do_compile ();
119 static void process_options (void);
120 static void backend_init (void);
121 static int lang_dependent_init (const char *);
122 static void init_asm_output (const char *);
123 static void finalize (bool);
125 static void crash_signal (int) ATTRIBUTE_NORETURN
;
126 static void compile_file (void);
128 /* True if we don't need a backend (e.g. preprocessing only). */
129 static bool no_backend
;
131 /* Length of line when printing switch values. */
134 /* Decoded options, and number of such options. */
135 struct cl_decoded_option
*save_decoded_options
;
136 unsigned int save_decoded_options_count
;
138 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
139 to optimize in process_options (). */
140 #define AUTODETECT_VALUE 2
142 /* Debug hooks - dependent upon command line options. */
144 const struct gcc_debug_hooks
*debug_hooks
;
146 /* The FUNCTION_DECL for the function currently being compiled,
147 or 0 if between functions. */
148 tree current_function_decl
;
150 /* Set to the FUNC_BEGIN label of the current function, or NULL
152 const char * current_function_func_begin_label
;
154 /* A random sequence of characters, unless overridden by user. */
155 static const char *flag_random_seed
;
157 /* A local time stamp derived from the time of compilation. It will be
158 zero if the system cannot provide a time. It will be -1u, if the
159 user has specified a particular random seed. */
162 /* Random number for this compilation */
163 HOST_WIDE_INT random_seed
;
167 /* When non-NULL, indicates that whenever space is allocated on the
168 stack, the resulting stack pointer must not pass this
169 address---that is, for stacks that grow downward, the stack pointer
170 must always be greater than or equal to this address; for stacks
171 that grow upward, the stack pointer must be less than this address.
172 At present, the rtx may be either a REG or a SYMBOL_REF, although
173 the support provided depends on the backend. */
176 /* True if the user has tagged the function with the 'section'
179 bool user_defined_section_attribute
= false;
181 struct target_flag_state default_target_flag_state
;
182 #if SWITCHABLE_TARGET
183 struct target_flag_state
*this_target_flag_state
= &default_target_flag_state
;
185 #define this_target_flag_state (&default_target_flag_state)
188 /* The user symbol prefix after having resolved same. */
189 const char *user_label_prefix
;
191 /* Output files for assembler code (real compiler output)
192 and debugging dumps. */
196 FILE *stack_usage_file
= NULL
;
198 /* The current working directory of a translation. It's generally the
199 directory from which compilation was initiated, but a preprocessed
200 file may specify the original directory in which it was
203 static const char *src_pwd
;
205 /* Initialize src_pwd with the given string, and return true. If it
206 was already initialized, return false. As a special case, it may
207 be called with a NULL argument to test whether src_pwd has NOT been
211 set_src_pwd (const char *pwd
)
215 if (strcmp (src_pwd
, pwd
) == 0)
221 src_pwd
= xstrdup (pwd
);
225 /* Return the directory from which the translation unit was initiated,
226 in case set_src_pwd() was not called before to assign it a
242 /* Called when the start of a function definition is parsed,
243 this function prints on stderr the name of the function. */
245 announce_function (tree decl
)
249 if (rtl_dump_and_exit
)
250 fprintf (stderr
, "%s ",
251 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl
))));
253 fprintf (stderr
, " %s",
254 identifier_to_locale (lang_hooks
.decl_printable_name (decl
, 2)));
256 pp_needs_newline (global_dc
->printer
) = true;
257 diagnostic_set_last_function (global_dc
, (diagnostic_info
*) NULL
);
261 /* Initialize local_tick with a random number or -1 if
262 flag_random_seed is set. */
265 init_local_tick (void)
267 if (!flag_random_seed
)
269 /* Try urandom first. Time of day is too likely to collide.
270 In case of any error we just use the local tick. */
272 int fd
= open ("/dev/urandom", O_RDONLY
);
275 read (fd
, &random_seed
, sizeof (random_seed
));
279 /* Now get the tick anyways */
280 #ifdef HAVE_GETTIMEOFDAY
284 gettimeofday (&tv
, NULL
);
285 local_tick
= (unsigned) tv
.tv_sec
* 1000 + tv
.tv_usec
/ 1000;
289 time_t now
= time (NULL
);
291 if (now
!= (time_t)-1)
292 local_tick
= (unsigned) now
;
300 /* Set up a default flag_random_seed and local_tick, unless the user
301 already specified one. Must be called after init_local_tick. */
304 init_random_seed (void)
307 random_seed
= local_tick
^ getpid (); /* Old racey fallback method */
310 /* Obtain the random_seed. Unless NOINIT, initialize it if
311 it's not provided in the command line. */
314 get_random_seed (bool noinit
)
316 if (!flag_random_seed
&& !noinit
)
321 /* Modify the random_seed string to VAL. Return its previous
325 set_random_seed (const char *val
)
327 const char *old
= flag_random_seed
;
328 flag_random_seed
= val
;
329 if (flag_random_seed
)
333 /* When the driver passed in a hex number don't crc it again */
334 random_seed
= strtoul (flag_random_seed
, &endp
, 0);
335 if (!(endp
> flag_random_seed
&& *endp
== 0))
336 random_seed
= crc32_string (0, flag_random_seed
);
341 /* Handler for fatal signals, such as SIGSEGV. These are transformed
342 into ICE messages, which is much more user friendly. In case the
343 error printer crashes, reset the signal to prevent infinite recursion. */
346 crash_signal (int signo
)
348 signal (signo
, SIG_DFL
);
350 /* If we crashed while processing an ASM statement, then be a little more
351 graceful. It's most likely the user's fault. */
352 if (this_is_asm_operands
)
354 output_operand_lossage ("unrecoverable error");
355 exit (FATAL_EXIT_CODE
);
358 internal_error ("%s", strsignal (signo
));
361 /* A subroutine of wrapup_global_declarations. We've come to the end of
362 the compilation unit. All deferred variables should be undeferred,
363 and all incomplete decls should be finalized. */
366 wrapup_global_declaration_1 (tree decl
)
368 /* We're not deferring this any longer. Assignment is conditional to
369 avoid needlessly dirtying PCH pages. */
370 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl
), TS_DECL_WITH_VIS
)
371 && DECL_DEFER_OUTPUT (decl
) != 0)
372 DECL_DEFER_OUTPUT (decl
) = 0;
374 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0)
375 lang_hooks
.finish_incomplete_decl (decl
);
378 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
379 needs to be output. Return true if it is output. */
382 wrapup_global_declaration_2 (tree decl
)
384 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
)
385 || (TREE_CODE (decl
) == VAR_DECL
&& DECL_HAS_VALUE_EXPR_P (decl
)))
388 /* Don't write out static consts, unless we still need them.
390 We also keep static consts if not optimizing (for debugging),
391 unless the user specified -fno-keep-static-consts.
392 ??? They might be better written into the debug information.
393 This is possible when using DWARF.
395 A language processor that wants static constants to be always
396 written out (even if it is not used) is responsible for
397 calling rest_of_decl_compilation itself. E.g. the C front-end
398 calls rest_of_decl_compilation from finish_decl.
399 One motivation for this is that is conventional in some
400 environments to write things like:
401 static const char rcsid[] = "... version string ...";
402 intending to force the string to be in the executable.
404 A language processor that would prefer to have unneeded
405 static constants "optimized away" would just defer writing
406 them out until here. E.g. C++ does this, because static
407 constants are often defined in header files.
409 ??? A tempting alternative (for both C and C++) would be
410 to force a constant to be written if and only if it is
411 defined in a main file, as opposed to an include file. */
413 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
417 node
= varpool_node::get (decl
);
419 if (!node
&& flag_ltrans
)
421 else if (node
&& node
->definition
)
423 else if (node
&& node
->alias
)
425 else if (!symtab
->global_info_ready
427 || TREE_USED (DECL_ASSEMBLER_NAME (decl
))))
429 else if (node
&& node
->analyzed
)
431 else if (DECL_COMDAT (decl
))
433 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
434 && (optimize
|| !flag_keep_static_consts
435 || DECL_ARTIFICIAL (decl
)))
440 rest_of_decl_compilation (decl
, 1, 1);
448 /* Do any final processing required for the declarations in VEC, of
449 which there are LEN. We write out inline functions and variables
450 that have been deferred until this point, but which are required.
451 Returns nonzero if anything was put out. */
454 wrapup_global_declarations (tree
*vec
, int len
)
456 bool reconsider
, output_something
= false;
459 for (i
= 0; i
< len
; i
++)
460 wrapup_global_declaration_1 (vec
[i
]);
462 /* Now emit any global variables or functions that we have been
463 putting off. We need to loop in case one of the things emitted
464 here references another one which comes earlier in the list. */
468 for (i
= 0; i
< len
; i
++)
469 reconsider
|= wrapup_global_declaration_2 (vec
[i
]);
471 output_something
= true;
475 return output_something
;
478 /* A subroutine of check_global_declarations. Issue appropriate warnings
479 for the global declaration DECL. */
482 check_global_declaration_1 (tree decl
)
484 /* Warn about any function declared static but not defined. We don't
485 warn about variables, because many programs have static variables
486 that exist only to get some text into the object file. */
487 if (TREE_CODE (decl
) == FUNCTION_DECL
488 && DECL_INITIAL (decl
) == 0
489 && DECL_EXTERNAL (decl
)
490 && ! DECL_ARTIFICIAL (decl
)
491 && ! TREE_NO_WARNING (decl
)
492 && ! TREE_PUBLIC (decl
)
493 && (warn_unused_function
494 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
496 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
497 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
499 warning (OPT_Wunused_function
, "%q+F declared %<static%> but never defined", decl
);
500 /* This symbol is effectively an "extern" declaration now. */
501 TREE_PUBLIC (decl
) = 1;
504 /* Warn about static fns or vars defined but not used. */
505 if (((warn_unused_function
&& TREE_CODE (decl
) == FUNCTION_DECL
)
506 /* We don't warn about "static const" variables because the
507 "rcs_id" idiom uses that construction. */
508 || (warn_unused_variable
509 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
510 && ! DECL_IN_SYSTEM_HEADER (decl
)
511 && ! TREE_USED (decl
)
512 /* The TREE_USED bit for file-scope decls is kept in the identifier,
513 to handle multiple external decls in different scopes. */
514 && ! (DECL_NAME (decl
) && TREE_USED (DECL_NAME (decl
)))
515 && ! DECL_EXTERNAL (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 /* Otherwise, ask the language. */
522 && lang_hooks
.decls
.warn_unused_global (decl
))
523 warning ((TREE_CODE (decl
) == FUNCTION_DECL
)
524 ? OPT_Wunused_function
525 : OPT_Wunused_variable
,
526 "%q+D defined but not used", decl
);
529 /* Issue appropriate warnings for the global declarations in V (of
530 which there are LEN). */
533 check_global_declarations (tree
*v
, int len
)
537 for (i
= 0; i
< len
; i
++)
538 check_global_declaration_1 (v
[i
]);
541 /* Emit debugging information for all global declarations in VEC. */
544 emit_debug_global_declarations (tree
*vec
, int len
)
548 /* Avoid confusing the debug information machinery when there are errors. */
552 timevar_push (TV_SYMOUT
);
553 for (i
= 0; i
< len
; i
++)
554 debug_hooks
->global_decl (vec
[i
]);
555 timevar_pop (TV_SYMOUT
);
558 /* Compile an entire translation unit. Write a file of assembly
559 output and various debugging dumps. */
564 timevar_start (TV_PHASE_PARSING
);
565 timevar_push (TV_PARSE_GLOBAL
);
567 /* Call the parser, which parses the entire file (calling
568 rest_of_compilation for each function). */
569 lang_hooks
.parse_file ();
571 timevar_pop (TV_PARSE_GLOBAL
);
572 timevar_stop (TV_PHASE_PARSING
);
574 /* Compilation is now finished except for writing
575 what's left of the symbol table output. */
577 if (flag_syntax_only
|| flag_wpa
)
580 ggc_protect_identifiers
= false;
582 /* This must also call finalize_compilation_unit. */
583 lang_hooks
.decls
.final_write_globals ();
588 timevar_start (TV_PHASE_LATE_ASM
);
590 /* Compilation unit is finalized. When producing non-fat LTO object, we are
591 basically finished. */
592 if (in_lto_p
|| !flag_lto
|| flag_fat_lto_objects
)
594 /* File-scope initialization for AddressSanitizer. */
595 if (flag_sanitize
& SANITIZE_ADDRESS
)
598 if (flag_sanitize
& SANITIZE_THREAD
)
601 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
)
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);
653 /* Let linker plugin know that this is a slim object and must be LTOed
654 even when user did not ask for it. */
655 if (!flag_fat_lto_objects
)
657 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
658 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
,
660 (unsigned HOST_WIDE_INT
) 1, 8);
661 #elif defined ASM_OUTPUT_ALIGNED_COMMON
662 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_slim",
663 (unsigned HOST_WIDE_INT
) 1, 8);
665 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_slim",
666 (unsigned HOST_WIDE_INT
) 1,
667 (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). */
707 print_version (FILE *file
, const char *indent
)
709 static const char fmt1
[] =
711 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
713 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
716 static const char fmt2
[] =
717 N_("GMP version %s, MPFR version %s, MPC version %s\n");
718 static const char fmt3
[] =
719 N_("%s%swarning: %s header version %s differs from library version %s.\n");
720 static const char fmt4
[] =
721 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
723 #define __VERSION__ "[?]"
726 file
== stderr
? _(fmt1
) : fmt1
,
727 indent
, *indent
!= 0 ? " " : "",
728 lang_hooks
.name
, pkgversion_string
, version_string
, TARGET_NAME
,
729 indent
, __VERSION__
);
731 /* We need to stringify the GMP macro values. Ugh, gmp_version has
732 two string formats, "i.j.k" and "i.j" when k is zero. As of
733 gmp-4.3.0, GMP always uses the 3 number format. */
734 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
735 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3 (X)
736 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
737 #define GCC_GMP_VERSION \
738 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
739 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
740 #define GCC_GMP_STRINGIFY_VERSION \
741 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
742 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR)
744 #define GCC_GMP_STRINGIFY_VERSION \
745 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
746 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR) "." \
747 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_PATCHLEVEL)
750 file
== stderr
? _(fmt2
) : fmt2
,
751 GCC_GMP_STRINGIFY_VERSION
, MPFR_VERSION_STRING
, MPC_VERSION_STRING
);
752 if (strcmp (GCC_GMP_STRINGIFY_VERSION
, gmp_version
))
754 file
== stderr
? _(fmt3
) : fmt3
,
755 indent
, *indent
!= 0 ? " " : "",
756 "GMP", GCC_GMP_STRINGIFY_VERSION
, gmp_version
);
757 if (strcmp (MPFR_VERSION_STRING
, mpfr_get_version ()))
759 file
== stderr
? _(fmt3
) : fmt3
,
760 indent
, *indent
!= 0 ? " " : "",
761 "MPFR", MPFR_VERSION_STRING
, mpfr_get_version ());
762 if (strcmp (MPC_VERSION_STRING
, mpc_get_version ()))
764 file
== stderr
? _(fmt3
) : fmt3
,
765 indent
, *indent
!= 0 ? " " : "",
766 "MPC", MPC_VERSION_STRING
, mpc_get_version ());
768 file
== stderr
? _(fmt4
) : fmt4
,
769 indent
, *indent
!= 0 ? " " : "",
770 PARAM_VALUE (GGC_MIN_EXPAND
), PARAM_VALUE (GGC_MIN_HEAPSIZE
));
772 print_plugins_versions (file
, indent
);
776 print_to_asm_out_file (print_switch_type type
, const char * text
)
778 bool prepend_sep
= true;
782 case SWITCH_TYPE_LINE_END
:
783 putc ('\n', asm_out_file
);
786 case SWITCH_TYPE_LINE_START
:
787 fputs (ASM_COMMENT_START
, asm_out_file
);
788 return strlen (ASM_COMMENT_START
);
790 case SWITCH_TYPE_DESCRIPTIVE
:
791 if (ASM_COMMENT_START
[0] == 0)
794 case SWITCH_TYPE_PASSED
:
795 case SWITCH_TYPE_ENABLED
:
797 fputc (' ', asm_out_file
);
798 fputs (text
, asm_out_file
);
799 /* No need to return the length here as
800 print_single_switch has already done it. */
809 print_to_stderr (print_switch_type type
, const char * text
)
813 case SWITCH_TYPE_LINE_END
:
817 case SWITCH_TYPE_LINE_START
:
820 case SWITCH_TYPE_PASSED
:
821 case SWITCH_TYPE_ENABLED
:
825 case SWITCH_TYPE_DESCRIPTIVE
:
826 fputs (text
, stderr
);
827 /* No need to return the length here as
828 print_single_switch has already done it. */
836 /* Print an option value and return the adjusted position in the line.
837 ??? print_fn doesn't handle errors, eg disk full; presumably other
838 code will catch a disk full though. */
841 print_single_switch (print_switch_fn_type print_fn
,
843 print_switch_type type
,
846 /* The ultrix fprintf returns 0 on success, so compute the result
847 we want here since we need it for the following test. The +1
848 is for the separator character that will probably be emitted. */
849 int len
= strlen (text
) + 1;
852 && pos
+ len
> MAX_LINE
)
854 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
859 pos
+= print_fn (SWITCH_TYPE_LINE_START
, NULL
);
861 print_fn (type
, text
);
865 /* Print active target switches using PRINT_FN.
866 POS is the current cursor position and MAX is the size of a "line".
867 Each line begins with INDENT and ends with TERM.
868 Each switch is separated from the next by SEP. */
871 print_switch_values (print_switch_fn_type print_fn
)
876 /* Fill in the -frandom-seed option, if the user didn't pass it, so
877 that it can be printed below. This helps reproducibility. */
878 if (!flag_random_seed
)
881 /* Print the options as passed. */
882 pos
= print_single_switch (print_fn
, pos
,
883 SWITCH_TYPE_DESCRIPTIVE
, _("options passed: "));
885 for (j
= 1; j
< save_decoded_options_count
; j
++)
887 switch (save_decoded_options
[j
].opt_index
)
900 pos
= print_single_switch (print_fn
, pos
, SWITCH_TYPE_PASSED
,
901 save_decoded_options
[j
].orig_option_with_args_text
);
905 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
907 /* Print the -f and -m options that have been enabled.
908 We don't handle language specific options but printing argv
910 pos
= print_single_switch (print_fn
, 0,
911 SWITCH_TYPE_DESCRIPTIVE
, _("options enabled: "));
913 for (j
= 0; j
< cl_options_count
; j
++)
914 if (cl_options
[j
].cl_report
915 && option_enabled (j
, &global_options
) > 0)
916 pos
= print_single_switch (print_fn
, pos
,
917 SWITCH_TYPE_ENABLED
, cl_options
[j
].opt_text
);
919 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
922 /* Open assembly code output file. Do this even if -fsyntax-only is
923 on, because then the driver will have provided the name of a
924 temporary file or bit bucket for us. NAME is the file specified on
925 the command line, possibly NULL. */
927 init_asm_output (const char *name
)
929 if (name
== NULL
&& asm_file_name
== 0)
930 asm_out_file
= stdout
;
933 if (asm_file_name
== 0)
935 int len
= strlen (dump_base_name
);
936 char *dumpname
= XNEWVEC (char, len
+ 6);
938 memcpy (dumpname
, dump_base_name
, len
+ 1);
939 strip_off_ending (dumpname
, len
);
940 strcat (dumpname
, ".s");
941 asm_file_name
= dumpname
;
943 if (!strcmp (asm_file_name
, "-"))
944 asm_out_file
= stdout
;
945 else if (!canonical_filename_eq (asm_file_name
, name
))
946 asm_out_file
= fopen (asm_file_name
, "w");
948 /* Use fatal_error (UNKOWN_LOCATION) instead of just fatal_error to
949 prevent gcc from printing the first line in the current file. */
950 fatal_error (UNKNOWN_LOCATION
,
951 "input file %qs is the same as output file",
953 if (asm_out_file
== 0)
954 fatal_error (UNKNOWN_LOCATION
,
955 "can%'t open %qs for writing: %m", asm_file_name
);
958 if (!flag_syntax_only
)
960 targetm
.asm_out
.file_start ();
962 if (flag_record_gcc_switches
)
964 if (targetm
.asm_out
.record_gcc_switches
)
966 /* Let the target know that we are about to start recording. */
967 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
969 /* Now record the switches. */
970 print_switch_values (targetm
.asm_out
.record_gcc_switches
);
971 /* Let the target know that the recording is over. */
972 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
976 inform (input_location
, "-frecord-gcc-switches is not supported by the current target");
979 if (flag_verbose_asm
)
981 /* Print the list of switches in effect
982 into the assembler file as comments. */
983 print_version (asm_out_file
, ASM_COMMENT_START
);
984 print_switch_values (print_to_asm_out_file
);
985 putc ('\n', asm_out_file
);
990 /* A helper function; used as the reallocator function for cpp's line
993 realloc_for_line_map (void *ptr
, size_t len
)
995 return ggc_realloc (ptr
, len
);
998 /* A helper function: used as the allocator function for
999 identifier_to_locale. */
1001 alloc_for_identifier_to_locale (size_t len
)
1003 return ggc_alloc_atomic (len
);
1006 /* Output stack usage information. */
1008 output_stack_usage (void)
1010 static bool warning_issued
= false;
1011 enum stack_usage_kind_type
{ STATIC
= 0, DYNAMIC
, DYNAMIC_BOUNDED
};
1012 const char *stack_usage_kind_str
[] = {
1017 HOST_WIDE_INT stack_usage
= current_function_static_stack_size
;
1018 enum stack_usage_kind_type stack_usage_kind
;
1020 if (stack_usage
< 0)
1022 if (!warning_issued
)
1024 warning (0, "stack usage computation not supported for this target");
1025 warning_issued
= true;
1030 stack_usage_kind
= STATIC
;
1032 /* Add the maximum amount of space pushed onto the stack. */
1033 if (current_function_pushed_stack_size
> 0)
1035 stack_usage
+= current_function_pushed_stack_size
;
1036 stack_usage_kind
= DYNAMIC_BOUNDED
;
1039 /* Now on to the tricky part: dynamic stack allocation. */
1040 if (current_function_allocates_dynamic_stack_space
)
1042 if (current_function_has_unbounded_dynamic_stack_size
)
1043 stack_usage_kind
= DYNAMIC
;
1045 stack_usage_kind
= DYNAMIC_BOUNDED
;
1047 /* Add the size even in the unbounded case, this can't hurt. */
1048 stack_usage
+= current_function_dynamic_stack_size
;
1051 if (flag_stack_usage
)
1053 expanded_location loc
1054 = expand_location (DECL_SOURCE_LOCATION (current_function_decl
));
1055 /* We don't want to print the full qualified name because it can be long,
1056 so we strip the scope prefix, but we may need to deal with the suffix
1057 created by the compiler. */
1059 = strchr (IDENTIFIER_POINTER (DECL_NAME (current_function_decl
)), '.');
1061 = lang_hooks
.decl_printable_name (current_function_decl
, 2);
1064 const char *dot
= strchr (name
, '.');
1065 while (dot
&& strcasecmp (dot
, suffix
) != 0)
1068 dot
= strchr (name
, '.');
1073 const char *dot
= strrchr (name
, '.');
1078 fprintf (stack_usage_file
,
1079 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC
"\t%s\n",
1080 lbasename (loc
.file
),
1085 stack_usage_kind_str
[stack_usage_kind
]);
1088 if (warn_stack_usage
>= 0)
1090 const location_t loc
= DECL_SOURCE_LOCATION (current_function_decl
);
1092 if (stack_usage_kind
== DYNAMIC
)
1093 warning_at (loc
, OPT_Wstack_usage_
, "stack usage might be unbounded");
1094 else if (stack_usage
> warn_stack_usage
)
1096 if (stack_usage_kind
== DYNAMIC_BOUNDED
)
1098 OPT_Wstack_usage_
, "stack usage might be %wd bytes",
1101 warning_at (loc
, OPT_Wstack_usage_
, "stack usage is %wd bytes",
1107 /* Open an auxiliary output file. */
1109 open_auxiliary_file (const char *ext
)
1114 filename
= concat (aux_base_name
, ".", ext
, NULL
);
1115 file
= fopen (filename
, "w");
1117 fatal_error ("can%'t open %s for writing: %m", filename
);
1122 /* Initialization of the front end environment, before command line
1123 options are parsed. Signal handlers, internationalization etc.
1124 ARGV0 is main's argv[0]. */
1126 general_init (const char *argv0
)
1130 p
= argv0
+ strlen (argv0
);
1131 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
1135 xmalloc_set_program_name (progname
);
1139 /* Unlock the stdio streams. */
1140 unlock_std_streams ();
1142 gcc_init_libintl ();
1144 identifier_to_locale_alloc
= alloc_for_identifier_to_locale
;
1145 identifier_to_locale_free
= ggc_free
;
1147 /* Initialize the diagnostics reporting machinery, so option parsing
1148 can give warnings and errors. */
1149 diagnostic_initialize (global_dc
, N_OPTS
);
1150 /* Set a default printer. Language specific initializations will
1151 override it later. */
1152 tree_diagnostics_defaults (global_dc
);
1154 global_dc
->show_caret
1155 = global_options_init
.x_flag_diagnostics_show_caret
;
1156 global_dc
->show_option_requested
1157 = global_options_init
.x_flag_diagnostics_show_option
;
1158 global_dc
->show_column
1159 = global_options_init
.x_flag_show_column
;
1160 global_dc
->internal_error
= plugins_internal_error_function
;
1161 global_dc
->option_enabled
= option_enabled
;
1162 global_dc
->option_state
= &global_options
;
1163 global_dc
->option_name
= option_name
;
1165 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1167 signal (SIGSEGV
, crash_signal
);
1170 signal (SIGILL
, crash_signal
);
1173 signal (SIGBUS
, crash_signal
);
1176 signal (SIGABRT
, crash_signal
);
1178 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1179 signal (SIGIOT
, crash_signal
);
1182 signal (SIGFPE
, crash_signal
);
1185 /* Other host-specific signal setup. */
1186 (*host_hooks
.extra_signals
)();
1188 /* Initialize the garbage-collector, string pools and tree type hash
1192 input_location
= UNKNOWN_LOCATION
;
1193 line_table
= ggc_alloc
<line_maps
> ();
1194 linemap_init (line_table
, BUILTINS_LOCATION
);
1195 line_table
->reallocator
= realloc_for_line_map
;
1196 line_table
->round_alloc_size
= ggc_round_alloc_size
;
1199 /* Initialize register usage now so switches may override. */
1202 /* Register the language-independent parameters. */
1203 global_init_params ();
1205 /* This must be done after global_init_params but before argument
1207 init_ggc_heuristics ();
1209 /* Create the singleton holder for global state.
1210 Doing so also creates the pass manager and with it the passes. */
1211 g
= new gcc::context ();
1212 symtab
= ggc_cleared_alloc
<symbol_table
> ();
1214 statistics_early_init ();
1218 /* Return true if the current target supports -fsection-anchors. */
1221 target_supports_section_anchors_p (void)
1223 if (targetm
.min_anchor_offset
== 0 && targetm
.max_anchor_offset
== 0)
1226 if (targetm
.asm_out
.output_anchor
== NULL
)
1232 /* Default the align_* variables to 1 if they're still unset, and
1233 set up the align_*_log variables. */
1235 init_alignments (void)
1237 if (align_loops
<= 0)
1239 if (align_loops_max_skip
> align_loops
)
1240 align_loops_max_skip
= align_loops
- 1;
1241 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
1242 if (align_jumps
<= 0)
1244 if (align_jumps_max_skip
> align_jumps
)
1245 align_jumps_max_skip
= align_jumps
- 1;
1246 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
1247 if (align_labels
<= 0)
1249 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
1250 if (align_labels_max_skip
> align_labels
)
1251 align_labels_max_skip
= align_labels
- 1;
1252 if (align_functions
<= 0)
1253 align_functions
= 1;
1254 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
1257 /* Process the options that have been parsed. */
1259 process_options (void)
1261 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1262 This can happen with incorrect pre-processed input. */
1263 debug_hooks
= &do_nothing_debug_hooks
;
1265 maximum_field_alignment
= initial_max_fld_align
* BITS_PER_UNIT
;
1267 /* Default to -fdiagnostics-color=auto if GCC_COLORS is in the environment,
1268 otherwise default to -fdiagnostics-color=never. */
1269 if (!global_options_set
.x_flag_diagnostics_show_color
1270 && getenv ("GCC_COLORS"))
1271 pp_show_color (global_dc
->printer
)
1272 = colorize_init (DIAGNOSTICS_COLOR_AUTO
);
1274 /* Allow the front end to perform consistency checks and do further
1275 initialization based on the command line options. This hook also
1276 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1277 so we can correctly initialize debug output. */
1278 no_backend
= lang_hooks
.post_options (&main_input_filename
);
1280 /* Set default values for parameters relation to the Scalar Reduction
1281 of Aggregates passes (SRA and IP-SRA). We must do this here, rather
1282 than in opts.c:default_options_optimization as historically these
1283 tuning heuristics have been based on MOVE_RATIO, which on some
1284 targets requires other symbols from the backend. */
1285 maybe_set_param_value
1286 (PARAM_SRA_MAX_SCALARIZATION_SIZE_SPEED
,
1287 get_move_ratio (true) * UNITS_PER_WORD
,
1288 global_options
.x_param_values
, global_options_set
.x_param_values
);
1289 maybe_set_param_value
1290 (PARAM_SRA_MAX_SCALARIZATION_SIZE_SIZE
,
1291 get_move_ratio (false) * UNITS_PER_WORD
,
1292 global_options
.x_param_values
, global_options_set
.x_param_values
);
1294 /* Some machines may reject certain combinations of options. */
1295 targetm
.target_option
.override ();
1297 /* Avoid any informative notes in the second run of -fcompare-debug. */
1298 if (flag_compare_debug
)
1299 diagnostic_inhibit_notes (global_dc
);
1301 if (flag_section_anchors
&& !target_supports_section_anchors_p ())
1303 warning (OPT_fsection_anchors
,
1304 "this target does not support %qs", "-fsection-anchors");
1305 flag_section_anchors
= 0;
1308 if (flag_short_enums
== 2)
1309 flag_short_enums
= targetm
.default_short_enums ();
1311 /* Set aux_base_name if not already set. */
1314 else if (main_input_filename
)
1316 char *name
= xstrdup (lbasename (main_input_filename
));
1318 strip_off_ending (name
, strlen (name
));
1319 aux_base_name
= name
;
1322 aux_base_name
= "gccaux";
1326 || flag_graphite_identity
1328 || flag_loop_interchange
1329 || flag_loop_strip_mine
1330 || flag_loop_parallelize_all
)
1331 sorry ("Graphite loop optimizations cannot be used (ISL is not available)"
1332 "(-fgraphite, -fgraphite-identity, -floop-block, "
1333 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1334 "and -ftree-loop-linear)");
1337 if (flag_check_pointer_bounds
)
1339 if (targetm
.chkp_bound_mode () == VOIDmode
)
1340 error ("-fcheck-pointer-bounds is not supported for this target");
1343 /* One region RA really helps to decrease the code size. */
1344 if (flag_ira_region
== IRA_REGION_AUTODETECT
)
1346 = optimize_size
|| !optimize
? IRA_REGION_ONE
: IRA_REGION_MIXED
;
1348 if (!abi_version_at_least (2))
1350 /* -fabi-version=1 support was removed after GCC 4.9. */
1351 error ("%<-fabi-version=1%> is no longer supported");
1352 flag_abi_version
= 2;
1355 /* Unrolling all loops implies that standard loop unrolling must also
1357 if (flag_unroll_all_loops
)
1358 flag_unroll_loops
= 1;
1360 /* web and rename-registers help when run after loop unrolling. */
1361 if (flag_web
== AUTODETECT_VALUE
)
1362 flag_web
= flag_unroll_loops
|| flag_peel_loops
;
1364 if (flag_rename_registers
== AUTODETECT_VALUE
)
1365 flag_rename_registers
= flag_unroll_loops
|| flag_peel_loops
;
1367 if (flag_non_call_exceptions
)
1368 flag_asynchronous_unwind_tables
= 1;
1369 if (flag_asynchronous_unwind_tables
)
1370 flag_unwind_tables
= 1;
1372 if (flag_value_profile_transformations
)
1373 flag_profile_values
= 1;
1375 /* Warn about options that are not supported on this machine. */
1376 #ifndef INSN_SCHEDULING
1377 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
1378 warning (0, "instruction scheduling not supported on this target machine");
1381 if (flag_delayed_branch
)
1382 warning (0, "this target machine does not have delayed branches");
1385 user_label_prefix
= USER_LABEL_PREFIX
;
1386 if (flag_leading_underscore
!= -1)
1388 /* If the default prefix is more complicated than "" or "_",
1389 issue a warning and ignore this option. */
1390 if (user_label_prefix
[0] == 0 ||
1391 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
1393 user_label_prefix
= flag_leading_underscore
? "_" : "";
1396 warning (0, "-f%sleading-underscore not supported on this target machine",
1397 flag_leading_underscore
? "" : "no-");
1400 /* If we are in verbose mode, write out the version and maybe all the
1401 option flags in use. */
1404 print_version (stderr
, "");
1406 print_switch_values (print_to_stderr
);
1409 if (flag_syntax_only
)
1411 write_symbols
= NO_DEBUG
;
1417 if (debug_info_level
== DINFO_LEVEL_NONE
)
1419 debug_info_level
= DINFO_LEVEL_NORMAL
;
1421 if (write_symbols
== NO_DEBUG
)
1422 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
1425 debug_info_level
= DINFO_LEVEL_NONE
;
1428 if (flag_dump_final_insns
&& !flag_syntax_only
&& !no_backend
)
1430 FILE *final_output
= fopen (flag_dump_final_insns
, "w");
1433 error ("could not open final insn dump file %qs: %m",
1434 flag_dump_final_insns
);
1435 flag_dump_final_insns
= NULL
;
1437 else if (fclose (final_output
))
1439 error ("could not close zeroed insn dump file %qs: %m",
1440 flag_dump_final_insns
);
1441 flag_dump_final_insns
= NULL
;
1445 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1447 if (debug_info_level
== DINFO_LEVEL_NONE
)
1448 write_symbols
= NO_DEBUG
;
1450 if (write_symbols
== NO_DEBUG
)
1452 #if defined(DBX_DEBUGGING_INFO)
1453 else if (write_symbols
== DBX_DEBUG
)
1454 debug_hooks
= &dbx_debug_hooks
;
1456 #if defined(XCOFF_DEBUGGING_INFO)
1457 else if (write_symbols
== XCOFF_DEBUG
)
1458 debug_hooks
= &xcoff_debug_hooks
;
1460 #ifdef SDB_DEBUGGING_INFO
1461 else if (write_symbols
== SDB_DEBUG
)
1462 debug_hooks
= &sdb_debug_hooks
;
1464 #ifdef DWARF2_DEBUGGING_INFO
1465 else if (write_symbols
== DWARF2_DEBUG
)
1466 debug_hooks
= &dwarf2_debug_hooks
;
1468 #ifdef VMS_DEBUGGING_INFO
1469 else if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1470 debug_hooks
= &vmsdbg_debug_hooks
;
1473 error ("target system does not support the \"%s\" debug format",
1474 debug_type_names
[write_symbols
]);
1476 /* We know which debug output will be used so we can set flag_var_tracking
1477 and flag_var_tracking_uninit if the user has not specified them. */
1478 if (debug_info_level
< DINFO_LEVEL_NORMAL
1479 || debug_hooks
->var_location
== do_nothing_debug_hooks
.var_location
)
1481 if (flag_var_tracking
== 1
1482 || flag_var_tracking_uninit
== 1)
1484 if (debug_info_level
< DINFO_LEVEL_NORMAL
)
1485 warning (0, "variable tracking requested, but useless unless "
1486 "producing debug info");
1488 warning (0, "variable tracking requested, but not supported "
1489 "by this debug format");
1491 flag_var_tracking
= 0;
1492 flag_var_tracking_uninit
= 0;
1495 /* The debug hooks are used to implement -fdump-go-spec because it
1496 gives a simple and stable API for all the information we need to
1498 if (flag_dump_go_spec
!= NULL
)
1499 debug_hooks
= dump_go_spec_init (flag_dump_go_spec
, debug_hooks
);
1501 /* If the user specifically requested variable tracking with tagging
1502 uninitialized variables, we need to turn on variable tracking.
1503 (We already determined above that variable tracking is feasible.) */
1504 if (flag_var_tracking_uninit
== 1)
1505 flag_var_tracking
= 1;
1507 if (flag_var_tracking
== AUTODETECT_VALUE
)
1508 flag_var_tracking
= optimize
>= 1;
1510 if (flag_var_tracking_uninit
== AUTODETECT_VALUE
)
1511 flag_var_tracking_uninit
= flag_var_tracking
;
1513 if (flag_var_tracking_assignments
== AUTODETECT_VALUE
)
1514 flag_var_tracking_assignments
= flag_var_tracking
1515 && !(flag_selective_scheduling
|| flag_selective_scheduling2
);
1517 if (flag_var_tracking_assignments_toggle
)
1518 flag_var_tracking_assignments
= !flag_var_tracking_assignments
;
1520 if (flag_var_tracking_assignments
&& !flag_var_tracking
)
1521 flag_var_tracking
= flag_var_tracking_assignments
= -1;
1523 if (flag_var_tracking_assignments
1524 && (flag_selective_scheduling
|| flag_selective_scheduling2
))
1525 warning (0, "var-tracking-assignments changes selective scheduling");
1527 if (flag_tree_cselim
== AUTODETECT_VALUE
)
1528 #ifdef HAVE_conditional_move
1529 flag_tree_cselim
= 1;
1531 flag_tree_cselim
= 0;
1534 /* If auxiliary info generation is desired, open the output file.
1535 This goes in the same directory as the source file--unlike
1536 all the other output files. */
1537 if (flag_gen_aux_info
)
1539 aux_info_file
= fopen (aux_info_file_name
, "w");
1540 if (aux_info_file
== 0)
1541 fatal_error ("can%'t open %s: %m", aux_info_file_name
);
1544 if (!targetm_common
.have_named_sections
)
1546 if (flag_function_sections
)
1548 warning (0, "-ffunction-sections not supported for this target");
1549 flag_function_sections
= 0;
1551 if (flag_data_sections
)
1553 warning (0, "-fdata-sections not supported for this target");
1554 flag_data_sections
= 0;
1558 #ifndef HAVE_prefetch
1559 if (flag_prefetch_loop_arrays
> 0)
1561 warning (0, "-fprefetch-loop-arrays not supported for this target");
1562 flag_prefetch_loop_arrays
= 0;
1565 if (flag_prefetch_loop_arrays
> 0 && !HAVE_prefetch
)
1567 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1568 flag_prefetch_loop_arrays
= 0;
1572 /* This combination of options isn't handled for i386 targets and doesn't
1573 make much sense anyway, so don't allow it. */
1574 if (flag_prefetch_loop_arrays
> 0 && optimize_size
)
1576 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1577 flag_prefetch_loop_arrays
= 0;
1580 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1581 if (flag_signaling_nans
)
1582 flag_trapping_math
= 1;
1584 /* We cannot reassociate if we want traps or signed zeros. */
1585 if (flag_associative_math
&& (flag_trapping_math
|| flag_signed_zeros
))
1587 warning (0, "-fassociative-math disabled; other options take precedence");
1588 flag_associative_math
= 0;
1591 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1592 if (flag_cx_limited_range
)
1593 flag_complex_method
= 0;
1595 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1596 if (flag_cx_fortran_rules
)
1597 flag_complex_method
= 1;
1599 /* Targets must be able to place spill slots at lower addresses. If the
1600 target already uses a soft frame pointer, the transition is trivial. */
1601 if (!FRAME_GROWS_DOWNWARD
&& flag_stack_protect
)
1603 warning (0, "-fstack-protector not supported for this target");
1604 flag_stack_protect
= 0;
1606 if (!flag_stack_protect
)
1607 warn_stack_protect
= 0;
1609 /* Address Sanitizer needs porting to each target architecture. */
1611 if ((flag_sanitize
& SANITIZE_ADDRESS
)
1612 && !FRAME_GROWS_DOWNWARD
)
1615 "-fsanitize=address and -fsanitize=kernel-address "
1616 "are not supported for this target");
1617 flag_sanitize
&= ~SANITIZE_ADDRESS
;
1620 if ((flag_sanitize
& SANITIZE_USER_ADDRESS
)
1621 && targetm
.asan_shadow_offset
== NULL
)
1623 warning (0, "-fsanitize=address not supported for this target");
1624 flag_sanitize
&= ~SANITIZE_ADDRESS
;
1627 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1628 have not been set. */
1629 if (!global_options_set
.x_warnings_are_errors
1630 && warn_coverage_mismatch
1631 && (global_dc
->classify_diagnostic
[OPT_Wcoverage_mismatch
] ==
1633 diagnostic_classify_diagnostic (global_dc
, OPT_Wcoverage_mismatch
,
1634 DK_ERROR
, UNKNOWN_LOCATION
);
1636 /* Save the current optimization options. */
1637 optimization_default_node
= build_optimization_node (&global_options
);
1638 optimization_current_node
= optimization_default_node
;
1641 /* This function can be called multiple times to reinitialize the compiler
1642 back end when register classes or instruction sets have changed,
1643 before each function. */
1645 backend_init_target (void)
1647 /* Initialize alignment variables. */
1650 /* This depends on stack_pointer_rtx. */
1651 init_fake_stack_mems ();
1653 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1655 init_alias_target ();
1657 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1660 /* Depends on the enabled attribute. */
1663 /* The following initialization functions need to generate rtl, so
1664 provide a dummy function context for them. */
1665 init_dummy_function_start ();
1667 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1668 on a mode change. */
1670 init_lower_subreg ();
1673 init_expr_target ();
1676 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1677 after a mode change as well. */
1678 caller_save_initialized_p
= false;
1680 expand_dummy_function_end ();
1683 /* Initialize the compiler back end. This function is called only once,
1684 when starting the compiler. */
1691 init_inline_once ();
1692 init_varasm_once ();
1693 save_register_info ();
1695 /* Middle end needs this initialization for default mem attributes
1696 used by early calls to make_decl_rtl. */
1699 /* Middle end needs this initialization for mode tables used to assign
1700 modes to vector variables. */
1704 /* Initialize excess precision settings. */
1706 init_excess_precision (void)
1708 /* Adjust excess precision handling based on the target options. If
1709 the front end cannot handle it, flag_excess_precision_cmdline
1710 will already have been set accordingly in the post_options
1712 gcc_assert (flag_excess_precision_cmdline
!= EXCESS_PRECISION_DEFAULT
);
1713 flag_excess_precision
= flag_excess_precision_cmdline
;
1714 if (flag_unsafe_math_optimizations
)
1715 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1716 if (flag_excess_precision
== EXCESS_PRECISION_STANDARD
)
1718 int flt_eval_method
= TARGET_FLT_EVAL_METHOD
;
1719 switch (flt_eval_method
)
1723 /* Either the target acts unpredictably (-1) or has all the
1724 operations required not to have excess precision (0). */
1725 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1729 /* In these cases, predictable excess precision makes
1733 /* Any other implementation-defined FLT_EVAL_METHOD values
1734 require the compiler to handle the associated excess
1735 precision rules in excess_precision_type. */
1741 /* Initialize things that are both lang-dependent and target-dependent.
1742 This function can be called more than once if target parameters change. */
1744 lang_dependent_init_target (void)
1746 /* This determines excess precision settings. */
1747 init_excess_precision ();
1749 /* This creates various _DECL nodes, so needs to be called after the
1750 front end is initialized. It also depends on the HAVE_xxx macros
1751 generated from the target machine description. */
1754 gcc_assert (!this_target_rtl
->target_specific_initialized
);
1757 /* Perform initializations that are lang-dependent or target-dependent.
1758 but matters only for late optimizations and RTL generation. */
1760 static int rtl_initialized
;
1763 initialize_rtl (void)
1765 /* Initialization done just once per compilation, but delayed
1766 till code generation. */
1767 if (!rtl_initialized
)
1769 rtl_initialized
= true;
1771 /* Target specific RTL backend initialization. */
1772 if (!this_target_rtl
->target_specific_initialized
)
1774 backend_init_target ();
1775 this_target_rtl
->target_specific_initialized
= true;
1779 /* Language-dependent initialization. Returns nonzero on success. */
1781 lang_dependent_init (const char *name
)
1783 location_t save_loc
= input_location
;
1784 if (dump_base_name
== 0)
1785 dump_base_name
= name
&& name
[0] ? name
: "gccdump";
1787 /* Other front-end initialization. */
1788 input_location
= BUILTINS_LOCATION
;
1789 if (lang_hooks
.init () == 0)
1791 input_location
= save_loc
;
1795 init_asm_output (name
);
1797 /* If stack usage information is desired, open the output file. */
1798 if (flag_stack_usage
)
1799 stack_usage_file
= open_auxiliary_file ("su");
1802 /* This creates various _DECL nodes, so needs to be called after the
1803 front end is initialized. */
1806 /* Do the target-specific parts of the initialization. */
1807 lang_dependent_init_target ();
1811 /* If dbx symbol table desired, initialize writing it and output the
1812 predefined types. */
1813 timevar_push (TV_SYMOUT
);
1815 /* Now we have the correct original filename, we can initialize
1817 (*debug_hooks
->init
) (name
);
1819 timevar_pop (TV_SYMOUT
);
1826 /* Reinitialize everything when target parameters, such as register usage,
1829 target_reinit (void)
1831 struct rtl_data saved_x_rtl
;
1832 rtx
*saved_regno_reg_rtx
;
1833 tree saved_optimization_current_node
;
1834 struct target_optabs
*saved_this_fn_optabs
;
1836 /* Temporarily switch to the default optimization node, so that
1837 *this_target_optabs is set to the default, not reflecting
1838 whatever a previous function used for the optimize
1840 saved_optimization_current_node
= optimization_current_node
;
1841 saved_this_fn_optabs
= this_fn_optabs
;
1842 if (saved_optimization_current_node
!= optimization_default_node
)
1844 optimization_current_node
= optimization_default_node
;
1845 cl_optimization_restore
1847 TREE_OPTIMIZATION (optimization_default_node
));
1849 this_fn_optabs
= this_target_optabs
;
1851 /* Save *crtl and regno_reg_rtx around the reinitialization
1852 to allow target_reinit being called even after prepare_function_start. */
1853 saved_regno_reg_rtx
= regno_reg_rtx
;
1854 if (saved_regno_reg_rtx
)
1856 saved_x_rtl
= *crtl
;
1857 memset (crtl
, '\0', sizeof (*crtl
));
1858 regno_reg_rtx
= NULL
;
1861 this_target_rtl
->target_specific_initialized
= false;
1863 /* This initializes hard_frame_pointer, and calls init_reg_modes_target()
1864 to initialize reg_raw_mode[]. */
1867 /* This invokes target hooks to set fixed_reg[] etc, which is
1871 /* Reinitialize lang-dependent parts. */
1872 lang_dependent_init_target ();
1874 /* Restore the original optimization node. */
1875 if (saved_optimization_current_node
!= optimization_default_node
)
1877 optimization_current_node
= saved_optimization_current_node
;
1878 cl_optimization_restore (&global_options
,
1879 TREE_OPTIMIZATION (optimization_current_node
));
1881 this_fn_optabs
= saved_this_fn_optabs
;
1883 /* Restore regno_reg_rtx at the end, as free_after_compilation from
1884 expand_dummy_function_end clears it. */
1885 if (saved_regno_reg_rtx
)
1887 *crtl
= saved_x_rtl
;
1888 regno_reg_rtx
= saved_regno_reg_rtx
;
1889 saved_regno_reg_rtx
= NULL
;
1894 dump_memory_report (bool final
)
1896 dump_line_table_statistics ();
1897 ggc_print_statistics ();
1898 stringpool_statistics ();
1899 dump_tree_statistics ();
1900 dump_gimple_statistics ();
1901 dump_rtx_statistics ();
1902 dump_alloc_pool_statistics ();
1903 dump_bitmap_statistics ();
1904 dump_vec_loc_statistics ();
1905 dump_ggc_loc_statistics (final
);
1906 dump_alias_stats (stderr
);
1907 dump_pta_stats (stderr
);
1910 /* Clean up: close opened files, etc. */
1913 finalize (bool no_backend
)
1915 /* Close the dump files. */
1916 if (flag_gen_aux_info
)
1918 fclose (aux_info_file
);
1920 unlink (aux_info_file_name
);
1923 /* Close non-debugging input and output files. Take special care to note
1924 whether fclose returns an error, since the pages might still be on the
1925 buffer chain while the file is open. */
1929 if (ferror (asm_out_file
) != 0)
1930 fatal_error ("error writing to %s: %m", asm_file_name
);
1931 if (fclose (asm_out_file
) != 0)
1932 fatal_error ("error closing %s: %m", asm_file_name
);
1935 if (stack_usage_file
)
1936 fclose (stack_usage_file
);
1942 g
->get_passes ()->finish_optimization_passes ();
1948 dump_memory_report (true);
1951 dump_profile_report ();
1953 /* Language-specific end of compilation actions. */
1954 lang_hooks
.finish ();
1958 standard_type_bitsize (int bitsize
)
1960 /* As a special exception, we always want __int128 enabled if possible. */
1963 if (bitsize
== CHAR_TYPE_SIZE
1964 || bitsize
== SHORT_TYPE_SIZE
1965 || bitsize
== INT_TYPE_SIZE
1966 || bitsize
== LONG_TYPE_SIZE
1967 || bitsize
== LONG_LONG_TYPE_SIZE
)
1972 /* Initialize the compiler, and compile the input file. */
1978 /* Don't do any more if an error has already occurred. */
1983 timevar_start (TV_PHASE_SETUP
);
1985 /* This must be run always, because it is needed to compute the FP
1986 predefined macros, such as __LDBL_MAX__, for targets using non
1987 default FP formats. */
1988 init_adjust_machine_modes ();
1989 init_derived_machine_modes ();
1991 /* This must happen after the backend has a chance to process
1992 command line options, but before the parsers are
1994 for (i
= 0; i
< NUM_INT_N_ENTS
; i
++)
1995 if (targetm
.scalar_mode_supported_p (int_n_data
[i
].m
)
1996 && ! standard_type_bitsize (int_n_data
[i
].bitsize
))
1997 int_n_enabled_p
[i
] = true;
1999 int_n_enabled_p
[i
] = false;
2001 /* Set up the back-end if requested. */
2005 /* Language-dependent initialization. Returns true on success. */
2006 if (lang_dependent_init (main_input_filename
))
2008 /* Initialize yet another pass. */
2010 ggc_protect_identifiers
= true;
2012 symtab
->initialize ();
2013 init_final (main_input_filename
);
2014 coverage_init (aux_base_name
);
2016 invoke_plugin_callbacks (PLUGIN_START_UNIT
, NULL
);
2018 timevar_stop (TV_PHASE_SETUP
);
2024 timevar_stop (TV_PHASE_SETUP
);
2027 timevar_start (TV_PHASE_FINALIZE
);
2029 finalize (no_backend
);
2031 timevar_stop (TV_PHASE_FINALIZE
);
2035 toplev::toplev (bool use_TV_TOTAL
)
2036 : m_use_TV_TOTAL (use_TV_TOTAL
)
2038 if (!m_use_TV_TOTAL
)
2044 timevar_stop (TV_TOTAL
);
2045 timevar_print (stderr
);
2049 toplev::start_timevars ()
2051 if (time_report
|| !quiet_flag
|| flag_detailed_statistics
)
2054 timevar_start (TV_TOTAL
);
2057 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2058 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2059 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2061 It is not safe to call this function more than once. */
2064 toplev::main (int argc
, char **argv
)
2066 /* Parsing and gimplification sometimes need quite large stack.
2067 Increase stack size limits if possible. */
2068 stack_limit_increase (64 * 1024 * 1024);
2070 expandargv (&argc
, &argv
);
2072 /* Initialization of GCC's environment, and diagnostics. */
2073 general_init (argv
[0]);
2075 /* One-off initialization of options that does not need to be
2076 repeated when options are added for particular functions. */
2077 init_options_once ();
2079 /* Initialize global options structures; this must be repeated for
2080 each structure used for parsing options. */
2081 init_options_struct (&global_options
, &global_options_set
);
2082 lang_hooks
.init_options_struct (&global_options
);
2084 /* Convert the options to an array. */
2085 decode_cmdline_options_to_array_default_mask (argc
,
2086 CONST_CAST2 (const char **,
2088 &save_decoded_options
,
2089 &save_decoded_options_count
);
2091 /* Perform language-specific options initialization. */
2092 lang_hooks
.init_options (save_decoded_options_count
, save_decoded_options
);
2094 /* Parse the options and do minimal processing; basically just
2095 enough to default flags appropriately. */
2096 decode_options (&global_options
, &global_options_set
,
2097 save_decoded_options
, save_decoded_options_count
,
2098 UNKNOWN_LOCATION
, global_dc
);
2100 handle_common_deferred_options ();
2104 initialize_plugins ();
2107 print_version (stderr
, "");
2110 print_plugins_help (stderr
, "");
2112 /* Exit early if we can (e.g. -help). */
2113 if (!exit_after_options
)
2120 if (warningcount
|| errorcount
|| werrorcount
)
2121 print_ignored_options ();
2123 /* Invoke registered plugin callbacks if any. Some plugins could
2124 emit some diagnostics here. */
2125 invoke_plugin_callbacks (PLUGIN_FINISH
, NULL
);
2127 diagnostic_finish (global_dc
);
2129 finalize_plugins ();
2130 location_adhoc_data_fini (line_table
);
2131 if (seen_error () || werrorcount
)
2132 return (FATAL_EXIT_CODE
);
2134 return (SUCCESS_EXIT_CODE
);
2137 /* For those that want to, this function aims to clean up enough state that
2138 you can call toplev::main again. */
2140 toplev::finalize (void)
2142 rtl_initialized
= false;
2143 this_target_rtl
->target_specific_initialized
= false;
2145 cgraph_c_finalize ();
2146 cgraphunit_c_finalize ();
2147 dwarf2out_c_finalize ();
2149 ipa_cp_c_finalize ();
2150 ipa_reference_c_finalize ();
2151 params_c_finalize ();