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"
52 #include "diagnostic.h"
53 #include "tree-diagnostic.h"
54 #include "tree-pretty-print.h"
58 #include "dwarf2asm.h"
61 #include "common/common-target.h"
62 #include "langhooks.h"
63 #include "cfgloop.h" /* for init_set_costs */
64 #include "hosthooks.h"
67 #include "opts-diagnostic.h"
69 #include "value-prof.h"
70 #include "alloc-pool.h"
73 #include "tree-ssa-alias.h"
74 #include "internal-fn.h"
75 #include "gimple-expr.h"
78 #include "diagnostic-color.h"
80 #include "pass_manager.h"
83 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
87 #ifdef SDB_DEBUGGING_INFO
91 #ifdef XCOFF_DEBUGGING_INFO
92 #include "xcoffout.h" /* Needed for external data
93 declarations for e.g. AIX 4.x. */
96 static void general_init (const char *);
97 static void do_compile (void);
98 static void process_options (void);
99 static void backend_init (void);
100 static int lang_dependent_init (const char *);
101 static void init_asm_output (const char *);
102 static void finalize (bool);
104 static void crash_signal (int) ATTRIBUTE_NORETURN
;
105 static void compile_file (void);
107 /* True if we don't need a backend (e.g. preprocessing only). */
108 static bool no_backend
;
110 /* Length of line when printing switch values. */
113 /* Decoded options, and number of such options. */
114 struct cl_decoded_option
*save_decoded_options
;
115 unsigned int save_decoded_options_count
;
117 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
118 to optimize in process_options (). */
119 #define AUTODETECT_VALUE 2
121 /* Debug hooks - dependent upon command line options. */
123 const struct gcc_debug_hooks
*debug_hooks
;
125 /* The FUNCTION_DECL for the function currently being compiled,
126 or 0 if between functions. */
127 tree current_function_decl
;
129 /* Set to the FUNC_BEGIN label of the current function, or NULL
131 const char * current_function_func_begin_label
;
133 /* A random sequence of characters, unless overridden by user. */
134 static const char *flag_random_seed
;
136 /* A local time stamp derived from the time of compilation. It will be
137 zero if the system cannot provide a time. It will be -1u, if the
138 user has specified a particular random seed. */
141 /* Random number for this compilation */
142 HOST_WIDE_INT random_seed
;
146 /* When non-NULL, indicates that whenever space is allocated on the
147 stack, the resulting stack pointer must not pass this
148 address---that is, for stacks that grow downward, the stack pointer
149 must always be greater than or equal to this address; for stacks
150 that grow upward, the stack pointer must be less than this address.
151 At present, the rtx may be either a REG or a SYMBOL_REF, although
152 the support provided depends on the backend. */
155 /* True if the user has tagged the function with the 'section'
158 bool user_defined_section_attribute
= false;
160 struct target_flag_state default_target_flag_state
;
161 #if SWITCHABLE_TARGET
162 struct target_flag_state
*this_target_flag_state
= &default_target_flag_state
;
164 #define this_target_flag_state (&default_target_flag_state)
167 /* The user symbol prefix after having resolved same. */
168 const char *user_label_prefix
;
170 /* Output files for assembler code (real compiler output)
171 and debugging dumps. */
175 FILE *stack_usage_file
= NULL
;
177 /* The current working directory of a translation. It's generally the
178 directory from which compilation was initiated, but a preprocessed
179 file may specify the original directory in which it was
182 static const char *src_pwd
;
184 /* Initialize src_pwd with the given string, and return true. If it
185 was already initialized, return false. As a special case, it may
186 be called with a NULL argument to test whether src_pwd has NOT been
190 set_src_pwd (const char *pwd
)
194 if (strcmp (src_pwd
, pwd
) == 0)
200 src_pwd
= xstrdup (pwd
);
204 /* Return the directory from which the translation unit was initiated,
205 in case set_src_pwd() was not called before to assign it a
221 /* Called when the start of a function definition is parsed,
222 this function prints on stderr the name of the function. */
224 announce_function (tree decl
)
228 if (rtl_dump_and_exit
)
229 fprintf (stderr
, "%s ",
230 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl
))));
232 fprintf (stderr
, " %s",
233 identifier_to_locale (lang_hooks
.decl_printable_name (decl
, 2)));
235 pp_needs_newline (global_dc
->printer
) = true;
236 diagnostic_set_last_function (global_dc
, (diagnostic_info
*) NULL
);
240 /* Initialize local_tick with a random number or -1 if
241 flag_random_seed is set. */
244 init_local_tick (void)
246 if (!flag_random_seed
)
248 /* Try urandom first. Time of day is too likely to collide.
249 In case of any error we just use the local tick. */
251 int fd
= open ("/dev/urandom", O_RDONLY
);
254 read (fd
, &random_seed
, sizeof (random_seed
));
258 /* Now get the tick anyways */
259 #ifdef HAVE_GETTIMEOFDAY
263 gettimeofday (&tv
, NULL
);
264 local_tick
= (unsigned) tv
.tv_sec
* 1000 + tv
.tv_usec
/ 1000;
268 time_t now
= time (NULL
);
270 if (now
!= (time_t)-1)
271 local_tick
= (unsigned) now
;
279 /* Set up a default flag_random_seed and local_tick, unless the user
280 already specified one. Must be called after init_local_tick. */
283 init_random_seed (void)
286 random_seed
= local_tick
^ getpid (); /* Old racey fallback method */
289 /* Obtain the random_seed. Unless NOINIT, initialize it if
290 it's not provided in the command line. */
293 get_random_seed (bool noinit
)
295 if (!flag_random_seed
&& !noinit
)
300 /* Modify the random_seed string to VAL. Return its previous
304 set_random_seed (const char *val
)
306 const char *old
= flag_random_seed
;
307 flag_random_seed
= val
;
308 if (flag_random_seed
)
312 /* When the driver passed in a hex number don't crc it again */
313 random_seed
= strtoul (flag_random_seed
, &endp
, 0);
314 if (!(endp
> flag_random_seed
&& *endp
== 0))
315 random_seed
= crc32_string (0, flag_random_seed
);
320 /* Handler for fatal signals, such as SIGSEGV. These are transformed
321 into ICE messages, which is much more user friendly. In case the
322 error printer crashes, reset the signal to prevent infinite recursion. */
325 crash_signal (int signo
)
327 signal (signo
, SIG_DFL
);
329 /* If we crashed while processing an ASM statement, then be a little more
330 graceful. It's most likely the user's fault. */
331 if (this_is_asm_operands
)
333 output_operand_lossage ("unrecoverable error");
334 exit (FATAL_EXIT_CODE
);
337 internal_error ("%s", strsignal (signo
));
340 /* A subroutine of wrapup_global_declarations. We've come to the end of
341 the compilation unit. All deferred variables should be undeferred,
342 and all incomplete decls should be finalized. */
345 wrapup_global_declaration_1 (tree decl
)
347 /* We're not deferring this any longer. Assignment is conditional to
348 avoid needlessly dirtying PCH pages. */
349 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl
), TS_DECL_WITH_VIS
)
350 && DECL_DEFER_OUTPUT (decl
) != 0)
351 DECL_DEFER_OUTPUT (decl
) = 0;
353 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0)
354 lang_hooks
.finish_incomplete_decl (decl
);
357 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
358 needs to be output. Return true if it is output. */
361 wrapup_global_declaration_2 (tree decl
)
363 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
)
364 || (TREE_CODE (decl
) == VAR_DECL
&& DECL_HAS_VALUE_EXPR_P (decl
)))
367 /* Don't write out static consts, unless we still need them.
369 We also keep static consts if not optimizing (for debugging),
370 unless the user specified -fno-keep-static-consts.
371 ??? They might be better written into the debug information.
372 This is possible when using DWARF.
374 A language processor that wants static constants to be always
375 written out (even if it is not used) is responsible for
376 calling rest_of_decl_compilation itself. E.g. the C front-end
377 calls rest_of_decl_compilation from finish_decl.
378 One motivation for this is that is conventional in some
379 environments to write things like:
380 static const char rcsid[] = "... version string ...";
381 intending to force the string to be in the executable.
383 A language processor that would prefer to have unneeded
384 static constants "optimized away" would just defer writing
385 them out until here. E.g. C++ does this, because static
386 constants are often defined in header files.
388 ??? A tempting alternative (for both C and C++) would be
389 to force a constant to be written if and only if it is
390 defined in a main file, as opposed to an include file. */
392 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
396 node
= varpool_node::get (decl
);
398 if (!node
&& flag_ltrans
)
400 else if (node
&& node
->definition
)
402 else if (node
&& node
->alias
)
404 else if (!cgraph_global_info_ready
406 || TREE_USED (DECL_ASSEMBLER_NAME (decl
))))
408 else if (node
&& node
->analyzed
)
410 else if (DECL_COMDAT (decl
))
412 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
413 && (optimize
|| !flag_keep_static_consts
414 || DECL_ARTIFICIAL (decl
)))
419 rest_of_decl_compilation (decl
, 1, 1);
427 /* Do any final processing required for the declarations in VEC, of
428 which there are LEN. We write out inline functions and variables
429 that have been deferred until this point, but which are required.
430 Returns nonzero if anything was put out. */
433 wrapup_global_declarations (tree
*vec
, int len
)
435 bool reconsider
, output_something
= false;
438 for (i
= 0; i
< len
; i
++)
439 wrapup_global_declaration_1 (vec
[i
]);
441 /* Now emit any global variables or functions that we have been
442 putting off. We need to loop in case one of the things emitted
443 here references another one which comes earlier in the list. */
447 for (i
= 0; i
< len
; i
++)
448 reconsider
|= wrapup_global_declaration_2 (vec
[i
]);
450 output_something
= true;
454 return output_something
;
457 /* A subroutine of check_global_declarations. Issue appropriate warnings
458 for the global declaration DECL. */
461 check_global_declaration_1 (tree decl
)
463 /* Warn about any function declared static but not defined. We don't
464 warn about variables, because many programs have static variables
465 that exist only to get some text into the object file. */
466 if (TREE_CODE (decl
) == FUNCTION_DECL
467 && DECL_INITIAL (decl
) == 0
468 && DECL_EXTERNAL (decl
)
469 && ! DECL_ARTIFICIAL (decl
)
470 && ! TREE_NO_WARNING (decl
)
471 && ! TREE_PUBLIC (decl
)
472 && (warn_unused_function
473 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
475 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
476 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
478 warning (OPT_Wunused_function
, "%q+F declared %<static%> but never defined", decl
);
479 /* This symbol is effectively an "extern" declaration now. */
480 TREE_PUBLIC (decl
) = 1;
483 /* Warn about static fns or vars defined but not used. */
484 if (((warn_unused_function
&& TREE_CODE (decl
) == FUNCTION_DECL
)
485 /* We don't warn about "static const" variables because the
486 "rcs_id" idiom uses that construction. */
487 || (warn_unused_variable
488 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
489 && ! DECL_IN_SYSTEM_HEADER (decl
)
490 && ! TREE_USED (decl
)
491 /* The TREE_USED bit for file-scope decls is kept in the identifier,
492 to handle multiple external decls in different scopes. */
493 && ! (DECL_NAME (decl
) && TREE_USED (DECL_NAME (decl
)))
494 && ! DECL_EXTERNAL (decl
)
495 && ! TREE_PUBLIC (decl
)
496 /* A volatile variable might be used in some non-obvious way. */
497 && ! TREE_THIS_VOLATILE (decl
)
498 /* Global register variables must be declared to reserve them. */
499 && ! (TREE_CODE (decl
) == VAR_DECL
&& DECL_REGISTER (decl
))
500 /* Otherwise, ask the language. */
501 && lang_hooks
.decls
.warn_unused_global (decl
))
502 warning ((TREE_CODE (decl
) == FUNCTION_DECL
)
503 ? OPT_Wunused_function
504 : OPT_Wunused_variable
,
505 "%q+D defined but not used", decl
);
508 /* Issue appropriate warnings for the global declarations in V (of
509 which there are LEN). */
512 check_global_declarations (tree
*v
, int len
)
516 for (i
= 0; i
< len
; i
++)
517 check_global_declaration_1 (v
[i
]);
520 /* Emit debugging information for all global declarations in VEC. */
523 emit_debug_global_declarations (tree
*vec
, int len
)
527 /* Avoid confusing the debug information machinery when there are errors. */
531 timevar_push (TV_SYMOUT
);
532 for (i
= 0; i
< len
; i
++)
533 debug_hooks
->global_decl (vec
[i
]);
534 timevar_pop (TV_SYMOUT
);
537 /* Compile an entire translation unit. Write a file of assembly
538 output and various debugging dumps. */
543 timevar_start (TV_PHASE_PARSING
);
544 timevar_push (TV_PARSE_GLOBAL
);
546 /* Call the parser, which parses the entire file (calling
547 rest_of_compilation for each function). */
548 lang_hooks
.parse_file ();
550 timevar_pop (TV_PARSE_GLOBAL
);
551 timevar_stop (TV_PHASE_PARSING
);
553 /* Compilation is now finished except for writing
554 what's left of the symbol table output. */
556 if (flag_syntax_only
|| flag_wpa
)
559 ggc_protect_identifiers
= false;
561 /* This must also call finalize_compilation_unit. */
562 lang_hooks
.decls
.final_write_globals ();
567 timevar_start (TV_PHASE_LATE_ASM
);
569 /* Compilation unit is finalized. When producing non-fat LTO object, we are
570 basically finished. */
571 if (in_lto_p
|| !flag_lto
|| flag_fat_lto_objects
)
573 /* File-scope initialization for AddressSanitizer. */
574 if (flag_sanitize
& SANITIZE_ADDRESS
)
577 if (flag_sanitize
& SANITIZE_THREAD
)
580 output_shared_constant_pool ();
581 output_object_blocks ();
582 finish_tm_clone_pairs ();
584 /* Write out any pending weak symbol declarations. */
587 /* This must be at the end before unwind and debug info.
588 Some target ports emit PIC setup thunks here. */
589 targetm
.asm_out
.code_end ();
591 /* Do dbx symbols. */
592 timevar_push (TV_SYMOUT
);
594 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
595 if (dwarf2out_do_frame ())
596 dwarf2out_frame_finish ();
599 (*debug_hooks
->finish
) (main_input_filename
);
600 timevar_pop (TV_SYMOUT
);
602 /* Output some stuff at end of file if nec. */
604 dw2_output_indirect_constants ();
606 /* Flush any pending external directives. */
607 process_pending_assemble_externals ();
610 /* Emit LTO marker if LTO info has been previously emitted. This is
611 used by collect2 to determine whether an object file contains IL.
612 We used to emit an undefined reference here, but this produces
613 link errors if an object file with IL is stored into a shared
614 library without invoking lto1. */
615 if (flag_generate_lto
)
617 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
618 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
,
620 (unsigned HOST_WIDE_INT
) 1, 8);
621 #elif defined ASM_OUTPUT_ALIGNED_COMMON
622 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_v1",
623 (unsigned HOST_WIDE_INT
) 1, 8);
625 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_v1",
626 (unsigned HOST_WIDE_INT
) 1,
627 (unsigned HOST_WIDE_INT
) 1);
629 /* Let linker plugin know that this is a slim object and must be LTOed
630 even when user did not ask for it. */
631 if (!flag_fat_lto_objects
)
633 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
634 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
,
636 (unsigned HOST_WIDE_INT
) 1, 8);
637 #elif defined ASM_OUTPUT_ALIGNED_COMMON
638 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_slim",
639 (unsigned HOST_WIDE_INT
) 1, 8);
641 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_slim",
642 (unsigned HOST_WIDE_INT
) 1,
643 (unsigned HOST_WIDE_INT
) 1);
648 /* Attach a special .ident directive to the end of the file to identify
649 the version of GCC which compiled this code. The format of the .ident
650 string is patterned after the ones produced by native SVR4 compilers. */
653 const char *pkg_version
= "(GNU) ";
656 if (strcmp ("(GCC) ", pkgversion_string
))
657 pkg_version
= pkgversion_string
;
659 ident_str
= ACONCAT (("GCC: ", pkg_version
, version_string
, NULL
));
660 targetm
.asm_out
.output_ident (ident_str
);
663 /* Invoke registered plugin callbacks. */
664 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT
, NULL
);
666 /* This must be at the end. Some target ports emit end of file directives
667 into the assembly file here, and hence we can not output anything to the
668 assembly file after this point. */
669 targetm
.asm_out
.file_end ();
671 timevar_stop (TV_PHASE_LATE_ASM
);
674 /* Print version information to FILE.
675 Each line begins with INDENT (for the case where FILE is the
676 assembler output file). */
679 print_version (FILE *file
, const char *indent
)
681 static const char fmt1
[] =
683 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
685 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
688 static const char fmt2
[] =
689 N_("GMP version %s, MPFR version %s, MPC version %s\n");
690 static const char fmt3
[] =
691 N_("%s%swarning: %s header version %s differs from library version %s.\n");
692 static const char fmt4
[] =
693 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
695 #define __VERSION__ "[?]"
698 file
== stderr
? _(fmt1
) : fmt1
,
699 indent
, *indent
!= 0 ? " " : "",
700 lang_hooks
.name
, pkgversion_string
, version_string
, TARGET_NAME
,
701 indent
, __VERSION__
);
703 /* We need to stringify the GMP macro values. Ugh, gmp_version has
704 two string formats, "i.j.k" and "i.j" when k is zero. As of
705 gmp-4.3.0, GMP always uses the 3 number format. */
706 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
707 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3 (X)
708 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
709 #define GCC_GMP_VERSION \
710 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
711 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
712 #define GCC_GMP_STRINGIFY_VERSION \
713 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
714 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR)
716 #define GCC_GMP_STRINGIFY_VERSION \
717 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
718 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR) "." \
719 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_PATCHLEVEL)
722 file
== stderr
? _(fmt2
) : fmt2
,
723 GCC_GMP_STRINGIFY_VERSION
, MPFR_VERSION_STRING
, MPC_VERSION_STRING
);
724 if (strcmp (GCC_GMP_STRINGIFY_VERSION
, gmp_version
))
726 file
== stderr
? _(fmt3
) : fmt3
,
727 indent
, *indent
!= 0 ? " " : "",
728 "GMP", GCC_GMP_STRINGIFY_VERSION
, gmp_version
);
729 if (strcmp (MPFR_VERSION_STRING
, mpfr_get_version ()))
731 file
== stderr
? _(fmt3
) : fmt3
,
732 indent
, *indent
!= 0 ? " " : "",
733 "MPFR", MPFR_VERSION_STRING
, mpfr_get_version ());
734 if (strcmp (MPC_VERSION_STRING
, mpc_get_version ()))
736 file
== stderr
? _(fmt3
) : fmt3
,
737 indent
, *indent
!= 0 ? " " : "",
738 "MPC", MPC_VERSION_STRING
, mpc_get_version ());
740 file
== stderr
? _(fmt4
) : fmt4
,
741 indent
, *indent
!= 0 ? " " : "",
742 PARAM_VALUE (GGC_MIN_EXPAND
), PARAM_VALUE (GGC_MIN_HEAPSIZE
));
744 print_plugins_versions (file
, indent
);
748 print_to_asm_out_file (print_switch_type type
, const char * text
)
750 bool prepend_sep
= true;
754 case SWITCH_TYPE_LINE_END
:
755 putc ('\n', asm_out_file
);
758 case SWITCH_TYPE_LINE_START
:
759 fputs (ASM_COMMENT_START
, asm_out_file
);
760 return strlen (ASM_COMMENT_START
);
762 case SWITCH_TYPE_DESCRIPTIVE
:
763 if (ASM_COMMENT_START
[0] == 0)
766 case SWITCH_TYPE_PASSED
:
767 case SWITCH_TYPE_ENABLED
:
769 fputc (' ', asm_out_file
);
770 fputs (text
, asm_out_file
);
771 /* No need to return the length here as
772 print_single_switch has already done it. */
781 print_to_stderr (print_switch_type type
, const char * text
)
785 case SWITCH_TYPE_LINE_END
:
789 case SWITCH_TYPE_LINE_START
:
792 case SWITCH_TYPE_PASSED
:
793 case SWITCH_TYPE_ENABLED
:
797 case SWITCH_TYPE_DESCRIPTIVE
:
798 fputs (text
, stderr
);
799 /* No need to return the length here as
800 print_single_switch has already done it. */
808 /* Print an option value and return the adjusted position in the line.
809 ??? print_fn doesn't handle errors, eg disk full; presumably other
810 code will catch a disk full though. */
813 print_single_switch (print_switch_fn_type print_fn
,
815 print_switch_type type
,
818 /* The ultrix fprintf returns 0 on success, so compute the result
819 we want here since we need it for the following test. The +1
820 is for the separator character that will probably be emitted. */
821 int len
= strlen (text
) + 1;
824 && pos
+ len
> MAX_LINE
)
826 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
831 pos
+= print_fn (SWITCH_TYPE_LINE_START
, NULL
);
833 print_fn (type
, text
);
837 /* Print active target switches using PRINT_FN.
838 POS is the current cursor position and MAX is the size of a "line".
839 Each line begins with INDENT and ends with TERM.
840 Each switch is separated from the next by SEP. */
843 print_switch_values (print_switch_fn_type print_fn
)
848 /* Fill in the -frandom-seed option, if the user didn't pass it, so
849 that it can be printed below. This helps reproducibility. */
850 if (!flag_random_seed
)
853 /* Print the options as passed. */
854 pos
= print_single_switch (print_fn
, pos
,
855 SWITCH_TYPE_DESCRIPTIVE
, _("options passed: "));
857 for (j
= 1; j
< save_decoded_options_count
; j
++)
859 switch (save_decoded_options
[j
].opt_index
)
872 pos
= print_single_switch (print_fn
, pos
, SWITCH_TYPE_PASSED
,
873 save_decoded_options
[j
].orig_option_with_args_text
);
877 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
879 /* Print the -f and -m options that have been enabled.
880 We don't handle language specific options but printing argv
882 pos
= print_single_switch (print_fn
, 0,
883 SWITCH_TYPE_DESCRIPTIVE
, _("options enabled: "));
885 for (j
= 0; j
< cl_options_count
; j
++)
886 if (cl_options
[j
].cl_report
887 && option_enabled (j
, &global_options
) > 0)
888 pos
= print_single_switch (print_fn
, pos
,
889 SWITCH_TYPE_ENABLED
, cl_options
[j
].opt_text
);
891 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
894 /* Open assembly code output file. Do this even if -fsyntax-only is
895 on, because then the driver will have provided the name of a
896 temporary file or bit bucket for us. NAME is the file specified on
897 the command line, possibly NULL. */
899 init_asm_output (const char *name
)
901 if (name
== NULL
&& asm_file_name
== 0)
902 asm_out_file
= stdout
;
905 if (asm_file_name
== 0)
907 int len
= strlen (dump_base_name
);
908 char *dumpname
= XNEWVEC (char, len
+ 6);
910 memcpy (dumpname
, dump_base_name
, len
+ 1);
911 strip_off_ending (dumpname
, len
);
912 strcat (dumpname
, ".s");
913 asm_file_name
= dumpname
;
915 if (!strcmp (asm_file_name
, "-"))
916 asm_out_file
= stdout
;
918 asm_out_file
= fopen (asm_file_name
, "w");
919 if (asm_out_file
== 0)
920 fatal_error ("can%'t open %s for writing: %m", asm_file_name
);
923 if (!flag_syntax_only
)
925 targetm
.asm_out
.file_start ();
927 if (flag_record_gcc_switches
)
929 if (targetm
.asm_out
.record_gcc_switches
)
931 /* Let the target know that we are about to start recording. */
932 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
934 /* Now record the switches. */
935 print_switch_values (targetm
.asm_out
.record_gcc_switches
);
936 /* Let the target know that the recording is over. */
937 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
941 inform (input_location
, "-frecord-gcc-switches is not supported by the current target");
944 if (flag_verbose_asm
)
946 /* Print the list of switches in effect
947 into the assembler file as comments. */
948 print_version (asm_out_file
, ASM_COMMENT_START
);
949 print_switch_values (print_to_asm_out_file
);
950 putc ('\n', asm_out_file
);
955 /* A helper function; used as the reallocator function for cpp's line
958 realloc_for_line_map (void *ptr
, size_t len
)
960 return ggc_realloc (ptr
, len
);
963 /* A helper function: used as the allocator function for
964 identifier_to_locale. */
966 alloc_for_identifier_to_locale (size_t len
)
968 return ggc_alloc_atomic (len
);
971 /* Output stack usage information. */
973 output_stack_usage (void)
975 static bool warning_issued
= false;
976 enum stack_usage_kind_type
{ STATIC
= 0, DYNAMIC
, DYNAMIC_BOUNDED
};
977 const char *stack_usage_kind_str
[] = {
982 HOST_WIDE_INT stack_usage
= current_function_static_stack_size
;
983 enum stack_usage_kind_type stack_usage_kind
;
989 warning (0, "stack usage computation not supported for this target");
990 warning_issued
= true;
995 stack_usage_kind
= STATIC
;
997 /* Add the maximum amount of space pushed onto the stack. */
998 if (current_function_pushed_stack_size
> 0)
1000 stack_usage
+= current_function_pushed_stack_size
;
1001 stack_usage_kind
= DYNAMIC_BOUNDED
;
1004 /* Now on to the tricky part: dynamic stack allocation. */
1005 if (current_function_allocates_dynamic_stack_space
)
1007 if (current_function_has_unbounded_dynamic_stack_size
)
1008 stack_usage_kind
= DYNAMIC
;
1010 stack_usage_kind
= DYNAMIC_BOUNDED
;
1012 /* Add the size even in the unbounded case, this can't hurt. */
1013 stack_usage
+= current_function_dynamic_stack_size
;
1016 if (flag_stack_usage
)
1018 expanded_location loc
1019 = expand_location (DECL_SOURCE_LOCATION (current_function_decl
));
1020 /* We don't want to print the full qualified name because it can be long,
1021 so we strip the scope prefix, but we may need to deal with the suffix
1022 created by the compiler. */
1024 = strchr (IDENTIFIER_POINTER (DECL_NAME (current_function_decl
)), '.');
1026 = lang_hooks
.decl_printable_name (current_function_decl
, 2);
1029 const char *dot
= strchr (name
, '.');
1030 while (dot
&& strcasecmp (dot
, suffix
) != 0)
1033 dot
= strchr (name
, '.');
1038 const char *dot
= strrchr (name
, '.');
1043 fprintf (stack_usage_file
,
1044 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC
"\t%s\n",
1045 lbasename (loc
.file
),
1050 stack_usage_kind_str
[stack_usage_kind
]);
1053 if (warn_stack_usage
>= 0)
1055 const location_t loc
= DECL_SOURCE_LOCATION (current_function_decl
);
1057 if (stack_usage_kind
== DYNAMIC
)
1058 warning_at (loc
, OPT_Wstack_usage_
, "stack usage might be unbounded");
1059 else if (stack_usage
> warn_stack_usage
)
1061 if (stack_usage_kind
== DYNAMIC_BOUNDED
)
1063 OPT_Wstack_usage_
, "stack usage might be %wd bytes",
1066 warning_at (loc
, OPT_Wstack_usage_
, "stack usage is %wd bytes",
1072 /* Open an auxiliary output file. */
1074 open_auxiliary_file (const char *ext
)
1079 filename
= concat (aux_base_name
, ".", ext
, NULL
);
1080 file
= fopen (filename
, "w");
1082 fatal_error ("can%'t open %s for writing: %m", filename
);
1087 /* Initialization of the front end environment, before command line
1088 options are parsed. Signal handlers, internationalization etc.
1089 ARGV0 is main's argv[0]. */
1091 general_init (const char *argv0
)
1095 p
= argv0
+ strlen (argv0
);
1096 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
1100 xmalloc_set_program_name (progname
);
1104 /* Unlock the stdio streams. */
1105 unlock_std_streams ();
1107 gcc_init_libintl ();
1109 identifier_to_locale_alloc
= alloc_for_identifier_to_locale
;
1110 identifier_to_locale_free
= ggc_free
;
1112 /* Initialize the diagnostics reporting machinery, so option parsing
1113 can give warnings and errors. */
1114 diagnostic_initialize (global_dc
, N_OPTS
);
1115 /* Set a default printer. Language specific initializations will
1116 override it later. */
1117 tree_diagnostics_defaults (global_dc
);
1119 global_dc
->show_caret
1120 = global_options_init
.x_flag_diagnostics_show_caret
;
1121 global_dc
->show_option_requested
1122 = global_options_init
.x_flag_diagnostics_show_option
;
1123 global_dc
->show_column
1124 = global_options_init
.x_flag_show_column
;
1125 global_dc
->internal_error
= plugins_internal_error_function
;
1126 global_dc
->option_enabled
= option_enabled
;
1127 global_dc
->option_state
= &global_options
;
1128 global_dc
->option_name
= option_name
;
1130 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1132 signal (SIGSEGV
, crash_signal
);
1135 signal (SIGILL
, crash_signal
);
1138 signal (SIGBUS
, crash_signal
);
1141 signal (SIGABRT
, crash_signal
);
1143 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1144 signal (SIGIOT
, crash_signal
);
1147 signal (SIGFPE
, crash_signal
);
1150 /* Other host-specific signal setup. */
1151 (*host_hooks
.extra_signals
)();
1153 /* Initialize the garbage-collector, string pools and tree type hash
1157 line_table
= ggc_alloc
<line_maps
> ();
1158 linemap_init (line_table
, BUILTINS_LOCATION
);
1159 line_table
->reallocator
= realloc_for_line_map
;
1160 line_table
->round_alloc_size
= ggc_round_alloc_size
;
1163 /* Initialize register usage now so switches may override. */
1166 /* Register the language-independent parameters. */
1167 global_init_params ();
1169 /* This must be done after global_init_params but before argument
1171 init_ggc_heuristics ();
1173 /* Create the singleton holder for global state.
1174 Doing so also creates the pass manager and with it the passes. */
1175 g
= new gcc::context ();
1177 statistics_early_init ();
1181 /* Return true if the current target supports -fsection-anchors. */
1184 target_supports_section_anchors_p (void)
1186 if (targetm
.min_anchor_offset
== 0 && targetm
.max_anchor_offset
== 0)
1189 if (targetm
.asm_out
.output_anchor
== NULL
)
1195 /* Default the align_* variables to 1 if they're still unset, and
1196 set up the align_*_log variables. */
1198 init_alignments (void)
1200 if (align_loops
<= 0)
1202 if (align_loops_max_skip
> align_loops
)
1203 align_loops_max_skip
= align_loops
- 1;
1204 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
1205 if (align_jumps
<= 0)
1207 if (align_jumps_max_skip
> align_jumps
)
1208 align_jumps_max_skip
= align_jumps
- 1;
1209 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
1210 if (align_labels
<= 0)
1212 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
1213 if (align_labels_max_skip
> align_labels
)
1214 align_labels_max_skip
= align_labels
- 1;
1215 if (align_functions
<= 0)
1216 align_functions
= 1;
1217 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
1220 /* Process the options that have been parsed. */
1222 process_options (void)
1224 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1225 This can happen with incorrect pre-processed input. */
1226 debug_hooks
= &do_nothing_debug_hooks
;
1228 maximum_field_alignment
= initial_max_fld_align
* BITS_PER_UNIT
;
1230 /* Default to -fdiagnostics-color=auto if GCC_COLORS is in the environment,
1231 otherwise default to -fdiagnostics-color=never. */
1232 if (!global_options_set
.x_flag_diagnostics_show_color
1233 && getenv ("GCC_COLORS"))
1234 pp_show_color (global_dc
->printer
)
1235 = colorize_init (DIAGNOSTICS_COLOR_AUTO
);
1237 /* Allow the front end to perform consistency checks and do further
1238 initialization based on the command line options. This hook also
1239 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1240 so we can correctly initialize debug output. */
1241 no_backend
= lang_hooks
.post_options (&main_input_filename
);
1243 /* Some machines may reject certain combinations of options. */
1244 targetm
.target_option
.override ();
1246 /* Avoid any informative notes in the second run of -fcompare-debug. */
1247 if (flag_compare_debug
)
1248 diagnostic_inhibit_notes (global_dc
);
1250 if (flag_section_anchors
&& !target_supports_section_anchors_p ())
1252 warning (OPT_fsection_anchors
,
1253 "this target does not support %qs", "-fsection-anchors");
1254 flag_section_anchors
= 0;
1257 if (flag_short_enums
== 2)
1258 flag_short_enums
= targetm
.default_short_enums ();
1260 /* Set aux_base_name if not already set. */
1263 else if (main_input_filename
)
1265 char *name
= xstrdup (lbasename (main_input_filename
));
1267 strip_off_ending (name
, strlen (name
));
1268 aux_base_name
= name
;
1271 aux_base_name
= "gccaux";
1275 || flag_graphite_identity
1277 || flag_loop_interchange
1278 || flag_loop_strip_mine
1279 || flag_loop_parallelize_all
)
1280 sorry ("Graphite loop optimizations cannot be used (ISL is not available)"
1281 "(-fgraphite, -fgraphite-identity, -floop-block, "
1282 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1283 "and -ftree-loop-linear)");
1286 /* One region RA really helps to decrease the code size. */
1287 if (flag_ira_region
== IRA_REGION_AUTODETECT
)
1289 = optimize_size
|| !optimize
? IRA_REGION_ONE
: IRA_REGION_MIXED
;
1291 if (!abi_version_at_least (2))
1293 /* -fabi-version=1 support was removed after GCC 4.9. */
1294 error ("%<-fabi-version=1%> is no longer supported");
1295 flag_abi_version
= 2;
1298 /* Unrolling all loops implies that standard loop unrolling must also
1300 if (flag_unroll_all_loops
)
1301 flag_unroll_loops
= 1;
1303 /* web and rename-registers help when run after loop unrolling. */
1304 if (flag_web
== AUTODETECT_VALUE
)
1305 flag_web
= flag_unroll_loops
|| flag_peel_loops
;
1307 if (flag_rename_registers
== AUTODETECT_VALUE
)
1308 flag_rename_registers
= flag_unroll_loops
|| flag_peel_loops
;
1310 if (flag_non_call_exceptions
)
1311 flag_asynchronous_unwind_tables
= 1;
1312 if (flag_asynchronous_unwind_tables
)
1313 flag_unwind_tables
= 1;
1315 if (flag_value_profile_transformations
)
1316 flag_profile_values
= 1;
1318 /* Warn about options that are not supported on this machine. */
1319 #ifndef INSN_SCHEDULING
1320 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
1321 warning (0, "instruction scheduling not supported on this target machine");
1324 if (flag_delayed_branch
)
1325 warning (0, "this target machine does not have delayed branches");
1328 user_label_prefix
= USER_LABEL_PREFIX
;
1329 if (flag_leading_underscore
!= -1)
1331 /* If the default prefix is more complicated than "" or "_",
1332 issue a warning and ignore this option. */
1333 if (user_label_prefix
[0] == 0 ||
1334 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
1336 user_label_prefix
= flag_leading_underscore
? "_" : "";
1339 warning (0, "-f%sleading-underscore not supported on this target machine",
1340 flag_leading_underscore
? "" : "no-");
1343 /* If we are in verbose mode, write out the version and maybe all the
1344 option flags in use. */
1347 print_version (stderr
, "");
1349 print_switch_values (print_to_stderr
);
1352 if (flag_syntax_only
)
1354 write_symbols
= NO_DEBUG
;
1360 if (debug_info_level
== DINFO_LEVEL_NONE
)
1362 debug_info_level
= DINFO_LEVEL_NORMAL
;
1364 if (write_symbols
== NO_DEBUG
)
1365 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
1368 debug_info_level
= DINFO_LEVEL_NONE
;
1371 if (flag_dump_final_insns
&& !flag_syntax_only
&& !no_backend
)
1373 FILE *final_output
= fopen (flag_dump_final_insns
, "w");
1376 error ("could not open final insn dump file %qs: %m",
1377 flag_dump_final_insns
);
1378 flag_dump_final_insns
= NULL
;
1380 else if (fclose (final_output
))
1382 error ("could not close zeroed insn dump file %qs: %m",
1383 flag_dump_final_insns
);
1384 flag_dump_final_insns
= NULL
;
1388 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1390 if (debug_info_level
== DINFO_LEVEL_NONE
)
1391 write_symbols
= NO_DEBUG
;
1393 if (write_symbols
== NO_DEBUG
)
1395 #if defined(DBX_DEBUGGING_INFO)
1396 else if (write_symbols
== DBX_DEBUG
)
1397 debug_hooks
= &dbx_debug_hooks
;
1399 #if defined(XCOFF_DEBUGGING_INFO)
1400 else if (write_symbols
== XCOFF_DEBUG
)
1401 debug_hooks
= &xcoff_debug_hooks
;
1403 #ifdef SDB_DEBUGGING_INFO
1404 else if (write_symbols
== SDB_DEBUG
)
1405 debug_hooks
= &sdb_debug_hooks
;
1407 #ifdef DWARF2_DEBUGGING_INFO
1408 else if (write_symbols
== DWARF2_DEBUG
)
1409 debug_hooks
= &dwarf2_debug_hooks
;
1411 #ifdef VMS_DEBUGGING_INFO
1412 else if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1413 debug_hooks
= &vmsdbg_debug_hooks
;
1416 error ("target system does not support the \"%s\" debug format",
1417 debug_type_names
[write_symbols
]);
1419 /* We know which debug output will be used so we can set flag_var_tracking
1420 and flag_var_tracking_uninit if the user has not specified them. */
1421 if (debug_info_level
< DINFO_LEVEL_NORMAL
1422 || debug_hooks
->var_location
== do_nothing_debug_hooks
.var_location
)
1424 if (flag_var_tracking
== 1
1425 || flag_var_tracking_uninit
== 1)
1427 if (debug_info_level
< DINFO_LEVEL_NORMAL
)
1428 warning (0, "variable tracking requested, but useless unless "
1429 "producing debug info");
1431 warning (0, "variable tracking requested, but not supported "
1432 "by this debug format");
1434 flag_var_tracking
= 0;
1435 flag_var_tracking_uninit
= 0;
1438 /* The debug hooks are used to implement -fdump-go-spec because it
1439 gives a simple and stable API for all the information we need to
1441 if (flag_dump_go_spec
!= NULL
)
1442 debug_hooks
= dump_go_spec_init (flag_dump_go_spec
, debug_hooks
);
1444 /* If the user specifically requested variable tracking with tagging
1445 uninitialized variables, we need to turn on variable tracking.
1446 (We already determined above that variable tracking is feasible.) */
1447 if (flag_var_tracking_uninit
== 1)
1448 flag_var_tracking
= 1;
1450 if (flag_var_tracking
== AUTODETECT_VALUE
)
1451 flag_var_tracking
= optimize
>= 1;
1453 if (flag_var_tracking_uninit
== AUTODETECT_VALUE
)
1454 flag_var_tracking_uninit
= flag_var_tracking
;
1456 if (flag_var_tracking_assignments
== AUTODETECT_VALUE
)
1457 flag_var_tracking_assignments
= flag_var_tracking
1458 && !(flag_selective_scheduling
|| flag_selective_scheduling2
);
1460 if (flag_var_tracking_assignments_toggle
)
1461 flag_var_tracking_assignments
= !flag_var_tracking_assignments
;
1463 if (flag_var_tracking_assignments
&& !flag_var_tracking
)
1464 flag_var_tracking
= flag_var_tracking_assignments
= -1;
1466 if (flag_var_tracking_assignments
1467 && (flag_selective_scheduling
|| flag_selective_scheduling2
))
1468 warning (0, "var-tracking-assignments changes selective scheduling");
1470 if (flag_tree_cselim
== AUTODETECT_VALUE
)
1471 #ifdef HAVE_conditional_move
1472 flag_tree_cselim
= 1;
1474 flag_tree_cselim
= 0;
1477 /* If auxiliary info generation is desired, open the output file.
1478 This goes in the same directory as the source file--unlike
1479 all the other output files. */
1480 if (flag_gen_aux_info
)
1482 aux_info_file
= fopen (aux_info_file_name
, "w");
1483 if (aux_info_file
== 0)
1484 fatal_error ("can%'t open %s: %m", aux_info_file_name
);
1487 if (!targetm_common
.have_named_sections
)
1489 if (flag_function_sections
)
1491 warning (0, "-ffunction-sections not supported for this target");
1492 flag_function_sections
= 0;
1494 if (flag_data_sections
)
1496 warning (0, "-fdata-sections not supported for this target");
1497 flag_data_sections
= 0;
1501 #ifndef HAVE_prefetch
1502 if (flag_prefetch_loop_arrays
> 0)
1504 warning (0, "-fprefetch-loop-arrays not supported for this target");
1505 flag_prefetch_loop_arrays
= 0;
1508 if (flag_prefetch_loop_arrays
> 0 && !HAVE_prefetch
)
1510 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1511 flag_prefetch_loop_arrays
= 0;
1515 /* This combination of options isn't handled for i386 targets and doesn't
1516 make much sense anyway, so don't allow it. */
1517 if (flag_prefetch_loop_arrays
> 0 && optimize_size
)
1519 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1520 flag_prefetch_loop_arrays
= 0;
1523 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1524 if (flag_signaling_nans
)
1525 flag_trapping_math
= 1;
1527 /* We cannot reassociate if we want traps or signed zeros. */
1528 if (flag_associative_math
&& (flag_trapping_math
|| flag_signed_zeros
))
1530 warning (0, "-fassociative-math disabled; other options take precedence");
1531 flag_associative_math
= 0;
1534 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1535 if (flag_cx_limited_range
)
1536 flag_complex_method
= 0;
1538 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1539 if (flag_cx_fortran_rules
)
1540 flag_complex_method
= 1;
1542 /* Targets must be able to place spill slots at lower addresses. If the
1543 target already uses a soft frame pointer, the transition is trivial. */
1544 if (!FRAME_GROWS_DOWNWARD
&& flag_stack_protect
)
1546 warning (0, "-fstack-protector not supported for this target");
1547 flag_stack_protect
= 0;
1549 if (!flag_stack_protect
)
1550 warn_stack_protect
= 0;
1552 /* Address Sanitizer needs porting to each target architecture. */
1554 if ((flag_sanitize
& SANITIZE_ADDRESS
)
1555 && !FRAME_GROWS_DOWNWARD
)
1558 "-fsanitize=address and -fsanitize=kernel-address "
1559 "are not supported for this target");
1560 flag_sanitize
&= ~SANITIZE_ADDRESS
;
1563 if ((flag_sanitize
& SANITIZE_USER_ADDRESS
)
1564 && targetm
.asan_shadow_offset
== NULL
)
1566 warning (0, "-fsanitize=address not supported for this target");
1567 flag_sanitize
&= ~SANITIZE_ADDRESS
;
1570 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1571 have not been set. */
1572 if (!global_options_set
.x_warnings_are_errors
1573 && warn_coverage_mismatch
1574 && (global_dc
->classify_diagnostic
[OPT_Wcoverage_mismatch
] ==
1576 diagnostic_classify_diagnostic (global_dc
, OPT_Wcoverage_mismatch
,
1577 DK_ERROR
, UNKNOWN_LOCATION
);
1579 /* Save the current optimization options. */
1580 optimization_default_node
= build_optimization_node (&global_options
);
1581 optimization_current_node
= optimization_default_node
;
1584 /* This function can be called multiple times to reinitialize the compiler
1585 back end when register classes or instruction sets have changed,
1586 before each function. */
1588 backend_init_target (void)
1590 /* Initialize alignment variables. */
1593 /* This depends on stack_pointer_rtx. */
1594 init_fake_stack_mems ();
1596 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1598 init_alias_target ();
1600 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1603 /* Depends on the enabled attribute. */
1606 /* The following initialization functions need to generate rtl, so
1607 provide a dummy function context for them. */
1608 init_dummy_function_start ();
1610 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1611 on a mode change. */
1613 init_lower_subreg ();
1616 init_expr_target ();
1619 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1620 after a mode change as well. */
1621 caller_save_initialized_p
= false;
1623 expand_dummy_function_end ();
1626 /* Initialize the compiler back end. This function is called only once,
1627 when starting the compiler. */
1634 init_inline_once ();
1635 init_varasm_once ();
1636 save_register_info ();
1638 /* Middle end needs this initialization for default mem attributes
1639 used by early calls to make_decl_rtl. */
1642 /* Middle end needs this initialization for mode tables used to assign
1643 modes to vector variables. */
1647 /* Initialize excess precision settings. */
1649 init_excess_precision (void)
1651 /* Adjust excess precision handling based on the target options. If
1652 the front end cannot handle it, flag_excess_precision_cmdline
1653 will already have been set accordingly in the post_options
1655 gcc_assert (flag_excess_precision_cmdline
!= EXCESS_PRECISION_DEFAULT
);
1656 flag_excess_precision
= flag_excess_precision_cmdline
;
1657 if (flag_unsafe_math_optimizations
)
1658 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1659 if (flag_excess_precision
== EXCESS_PRECISION_STANDARD
)
1661 int flt_eval_method
= TARGET_FLT_EVAL_METHOD
;
1662 switch (flt_eval_method
)
1666 /* Either the target acts unpredictably (-1) or has all the
1667 operations required not to have excess precision (0). */
1668 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1672 /* In these cases, predictable excess precision makes
1676 /* Any other implementation-defined FLT_EVAL_METHOD values
1677 require the compiler to handle the associated excess
1678 precision rules in excess_precision_type. */
1684 /* Initialize things that are both lang-dependent and target-dependent.
1685 This function can be called more than once if target parameters change. */
1687 lang_dependent_init_target (void)
1689 /* This determines excess precision settings. */
1690 init_excess_precision ();
1692 /* This creates various _DECL nodes, so needs to be called after the
1693 front end is initialized. It also depends on the HAVE_xxx macros
1694 generated from the target machine description. */
1697 gcc_assert (!this_target_rtl
->target_specific_initialized
);
1700 /* Perform initializations that are lang-dependent or target-dependent.
1701 but matters only for late optimizations and RTL generation. */
1704 initialize_rtl (void)
1706 static int initialized_once
;
1708 /* Initialization done just once per compilation, but delayed
1709 till code generation. */
1710 if (!initialized_once
)
1712 initialized_once
= true;
1714 /* Target specific RTL backend initialization. */
1715 if (!this_target_rtl
->target_specific_initialized
)
1717 backend_init_target ();
1718 this_target_rtl
->target_specific_initialized
= true;
1722 /* Language-dependent initialization. Returns nonzero on success. */
1724 lang_dependent_init (const char *name
)
1726 location_t save_loc
= input_location
;
1727 if (dump_base_name
== 0)
1728 dump_base_name
= name
&& name
[0] ? name
: "gccdump";
1730 /* Other front-end initialization. */
1731 input_location
= BUILTINS_LOCATION
;
1732 if (lang_hooks
.init () == 0)
1734 input_location
= save_loc
;
1738 init_asm_output (name
);
1740 /* If stack usage information is desired, open the output file. */
1741 if (flag_stack_usage
)
1742 stack_usage_file
= open_auxiliary_file ("su");
1745 /* This creates various _DECL nodes, so needs to be called after the
1746 front end is initialized. */
1749 /* Do the target-specific parts of the initialization. */
1750 lang_dependent_init_target ();
1754 /* If dbx symbol table desired, initialize writing it and output the
1755 predefined types. */
1756 timevar_push (TV_SYMOUT
);
1758 /* Now we have the correct original filename, we can initialize
1760 (*debug_hooks
->init
) (name
);
1762 timevar_pop (TV_SYMOUT
);
1769 /* Reinitialize everything when target parameters, such as register usage,
1772 target_reinit (void)
1774 struct rtl_data saved_x_rtl
;
1775 rtx
*saved_regno_reg_rtx
;
1776 tree saved_optimization_current_node
;
1777 struct target_optabs
*saved_this_fn_optabs
;
1779 /* Temporarily switch to the default optimization node, so that
1780 *this_target_optabs is set to the default, not reflecting
1781 whatever a previous function used for the optimize
1783 saved_optimization_current_node
= optimization_current_node
;
1784 saved_this_fn_optabs
= this_fn_optabs
;
1785 if (saved_optimization_current_node
!= optimization_default_node
)
1787 optimization_current_node
= optimization_default_node
;
1788 cl_optimization_restore
1790 TREE_OPTIMIZATION (optimization_default_node
));
1792 this_fn_optabs
= this_target_optabs
;
1794 /* Save *crtl and regno_reg_rtx around the reinitialization
1795 to allow target_reinit being called even after prepare_function_start. */
1796 saved_regno_reg_rtx
= regno_reg_rtx
;
1797 if (saved_regno_reg_rtx
)
1799 saved_x_rtl
= *crtl
;
1800 memset (crtl
, '\0', sizeof (*crtl
));
1801 regno_reg_rtx
= NULL
;
1804 this_target_rtl
->target_specific_initialized
= false;
1806 /* This initializes hard_frame_pointer, and calls init_reg_modes_target()
1807 to initialize reg_raw_mode[]. */
1810 /* This invokes target hooks to set fixed_reg[] etc, which is
1814 /* Reinitialize lang-dependent parts. */
1815 lang_dependent_init_target ();
1817 /* Restore the original optimization node. */
1818 if (saved_optimization_current_node
!= optimization_default_node
)
1820 optimization_current_node
= saved_optimization_current_node
;
1821 cl_optimization_restore (&global_options
,
1822 TREE_OPTIMIZATION (optimization_current_node
));
1824 this_fn_optabs
= saved_this_fn_optabs
;
1826 /* Restore regno_reg_rtx at the end, as free_after_compilation from
1827 expand_dummy_function_end clears it. */
1828 if (saved_regno_reg_rtx
)
1830 *crtl
= saved_x_rtl
;
1831 regno_reg_rtx
= saved_regno_reg_rtx
;
1832 saved_regno_reg_rtx
= NULL
;
1837 dump_memory_report (bool final
)
1839 dump_line_table_statistics ();
1840 ggc_print_statistics ();
1841 stringpool_statistics ();
1842 dump_tree_statistics ();
1843 dump_gimple_statistics ();
1844 dump_rtx_statistics ();
1845 dump_alloc_pool_statistics ();
1846 dump_bitmap_statistics ();
1847 dump_vec_loc_statistics ();
1848 dump_ggc_loc_statistics (final
);
1849 dump_alias_stats (stderr
);
1850 dump_pta_stats (stderr
);
1853 /* Clean up: close opened files, etc. */
1856 finalize (bool no_backend
)
1858 /* Close the dump files. */
1859 if (flag_gen_aux_info
)
1861 fclose (aux_info_file
);
1863 unlink (aux_info_file_name
);
1866 /* Close non-debugging input and output files. Take special care to note
1867 whether fclose returns an error, since the pages might still be on the
1868 buffer chain while the file is open. */
1872 if (ferror (asm_out_file
) != 0)
1873 fatal_error ("error writing to %s: %m", asm_file_name
);
1874 if (fclose (asm_out_file
) != 0)
1875 fatal_error ("error closing %s: %m", asm_file_name
);
1878 if (stack_usage_file
)
1879 fclose (stack_usage_file
);
1885 g
->get_passes ()->finish_optimization_passes ();
1891 dump_memory_report (true);
1894 dump_profile_report ();
1896 /* Language-specific end of compilation actions. */
1897 lang_hooks
.finish ();
1900 /* Initialize the compiler, and compile the input file. */
1904 /* Initialize timing first. The C front ends read the main file in
1905 the post_options hook, and C++ does file timings. */
1906 if (time_report
|| !quiet_flag
|| flag_detailed_statistics
)
1908 timevar_start (TV_TOTAL
);
1912 /* Don't do any more if an error has already occurred. */
1915 timevar_start (TV_PHASE_SETUP
);
1917 /* This must be run always, because it is needed to compute the FP
1918 predefined macros, such as __LDBL_MAX__, for targets using non
1919 default FP formats. */
1920 init_adjust_machine_modes ();
1921 init_derived_machine_modes ();
1923 /* Set up the back-end if requested. */
1927 /* Language-dependent initialization. Returns true on success. */
1928 if (lang_dependent_init (main_input_filename
))
1930 /* Initialize yet another pass. */
1932 ggc_protect_identifiers
= true;
1935 init_final (main_input_filename
);
1936 coverage_init (aux_base_name
);
1938 invoke_plugin_callbacks (PLUGIN_START_UNIT
, NULL
);
1940 timevar_stop (TV_PHASE_SETUP
);
1946 timevar_stop (TV_PHASE_SETUP
);
1949 timevar_start (TV_PHASE_FINALIZE
);
1951 finalize (no_backend
);
1953 timevar_stop (TV_PHASE_FINALIZE
);
1956 /* Stop timing and print the times. */
1957 timevar_stop (TV_TOTAL
);
1958 timevar_print (stderr
);
1961 /* Entry point of cc1, cc1plus, jc1, f771, etc.
1962 Exit code is FATAL_EXIT_CODE if can't open files or if there were
1963 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
1965 It is not safe to call this function more than once. */
1968 toplev_main (int argc
, char **argv
)
1970 /* Parsing and gimplification sometimes need quite large stack.
1971 Increase stack size limits if possible. */
1972 stack_limit_increase (64 * 1024 * 1024);
1974 expandargv (&argc
, &argv
);
1976 /* Initialization of GCC's environment, and diagnostics. */
1977 general_init (argv
[0]);
1979 /* One-off initialization of options that does not need to be
1980 repeated when options are added for particular functions. */
1981 init_options_once ();
1983 /* Initialize global options structures; this must be repeated for
1984 each structure used for parsing options. */
1985 init_options_struct (&global_options
, &global_options_set
);
1986 lang_hooks
.init_options_struct (&global_options
);
1988 /* Convert the options to an array. */
1989 decode_cmdline_options_to_array_default_mask (argc
,
1990 CONST_CAST2 (const char **,
1992 &save_decoded_options
,
1993 &save_decoded_options_count
);
1995 /* Perform language-specific options initialization. */
1996 lang_hooks
.init_options (save_decoded_options_count
, save_decoded_options
);
1998 /* Parse the options and do minimal processing; basically just
1999 enough to default flags appropriately. */
2000 decode_options (&global_options
, &global_options_set
,
2001 save_decoded_options
, save_decoded_options_count
,
2002 UNKNOWN_LOCATION
, global_dc
);
2004 handle_common_deferred_options ();
2008 initialize_plugins ();
2011 print_version (stderr
, "");
2014 print_plugins_help (stderr
, "");
2016 /* Exit early if we can (e.g. -help). */
2017 if (!exit_after_options
)
2020 if (warningcount
|| errorcount
|| werrorcount
)
2021 print_ignored_options ();
2023 /* Invoke registered plugin callbacks if any. Some plugins could
2024 emit some diagnostics here. */
2025 invoke_plugin_callbacks (PLUGIN_FINISH
, NULL
);
2027 diagnostic_finish (global_dc
);
2029 finalize_plugins ();
2030 location_adhoc_data_fini (line_table
);
2031 if (seen_error () || werrorcount
)
2032 return (FATAL_EXIT_CODE
);
2034 return (SUCCESS_EXIT_CODE
);