1 /* Top level of GCC compilers (cc1, cc1plus, etc.)
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
4 2011 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
29 #include "coretypes.h"
34 #include "realmpfr.h" /* For GMP/MPFR/MPC versions, in print_version. */
39 #include "insn-attr.h"
40 #include "insn-config.h"
41 #include "insn-flags.h"
42 #include "hard-reg-set.h"
49 #include "basic-block.h"
55 #include "diagnostic.h"
56 #include "tree-diagnostic.h"
57 #include "tree-pretty-print.h"
61 #include "dwarf2asm.h"
64 #include "common/common-target.h"
65 #include "langhooks.h"
66 #include "cfgloop.h" /* for init_set_costs */
67 #include "hosthooks.h"
70 #include "opts-diagnostic.h"
72 #include "value-prof.h"
73 #include "alloc-pool.h"
74 #include "tree-mudflap.h"
76 #include "tree-ssa-alias.h"
79 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
83 #ifdef SDB_DEBUGGING_INFO
87 #ifdef XCOFF_DEBUGGING_INFO
88 #include "xcoffout.h" /* Needed for external data
89 declarations for e.g. AIX 4.x. */
92 static void general_init (const char *);
93 static void do_compile (void);
94 static void process_options (void);
95 static void backend_init (void);
96 static int lang_dependent_init (const char *);
97 static void init_asm_output (const char *);
98 static void finalize (bool);
100 static void crash_signal (int) ATTRIBUTE_NORETURN
;
101 static void compile_file (void);
103 /* True if we don't need a backend (e.g. preprocessing only). */
104 static bool no_backend
;
106 /* Length of line when printing switch values. */
109 /* Decoded options, and number of such options. */
110 struct cl_decoded_option
*save_decoded_options
;
111 unsigned int save_decoded_options_count
;
113 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
114 to optimize in process_options (). */
115 #define AUTODETECT_VALUE 2
117 /* Debug hooks - dependent upon command line options. */
119 const struct gcc_debug_hooks
*debug_hooks
;
121 /* The FUNCTION_DECL for the function currently being compiled,
122 or 0 if between functions. */
123 tree current_function_decl
;
125 /* Set to the FUNC_BEGIN label of the current function, or NULL
127 const char * current_function_func_begin_label
;
129 /* A random sequence of characters, unless overridden by user. */
130 static const char *flag_random_seed
;
132 /* A local time stamp derived from the time of compilation. It will be
133 zero if the system cannot provide a time. It will be -1u, if the
134 user has specified a particular random seed. */
137 /* Random number for this compilation */
138 HOST_WIDE_INT random_seed
;
142 /* When non-NULL, indicates that whenever space is allocated on the
143 stack, the resulting stack pointer must not pass this
144 address---that is, for stacks that grow downward, the stack pointer
145 must always be greater than or equal to this address; for stacks
146 that grow upward, the stack pointer must be less than this address.
147 At present, the rtx may be either a REG or a SYMBOL_REF, although
148 the support provided depends on the backend. */
151 /* True if the user has tagged the function with the 'section'
154 bool user_defined_section_attribute
= false;
156 struct target_flag_state default_target_flag_state
;
157 #if SWITCHABLE_TARGET
158 struct target_flag_state
*this_target_flag_state
= &default_target_flag_state
;
160 #define this_target_flag_state (&default_target_flag_state)
163 /* The user symbol prefix after having resolved same. */
164 const char *user_label_prefix
;
166 /* Output files for assembler code (real compiler output)
167 and debugging dumps. */
171 FILE *stack_usage_file
= NULL
;
173 /* The current working directory of a translation. It's generally the
174 directory from which compilation was initiated, but a preprocessed
175 file may specify the original directory in which it was
178 static const char *src_pwd
;
180 /* Initialize src_pwd with the given string, and return true. If it
181 was already initialized, return false. As a special case, it may
182 be called with a NULL argument to test whether src_pwd has NOT been
186 set_src_pwd (const char *pwd
)
190 if (strcmp (src_pwd
, pwd
) == 0)
196 src_pwd
= xstrdup (pwd
);
200 /* Return the directory from which the translation unit was initiated,
201 in case set_src_pwd() was not called before to assign it a
217 /* Called when the start of a function definition is parsed,
218 this function prints on stderr the name of the function. */
220 announce_function (tree decl
)
224 if (rtl_dump_and_exit
)
225 fprintf (stderr
, "%s ",
226 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl
))));
228 fprintf (stderr
, " %s",
229 identifier_to_locale (lang_hooks
.decl_printable_name (decl
, 2)));
231 pp_needs_newline (global_dc
->printer
) = true;
232 diagnostic_set_last_function (global_dc
, (diagnostic_info
*) NULL
);
236 /* Initialize local_tick with a random number or -1 if
237 flag_random_seed is set. */
240 init_local_tick (void)
242 if (!flag_random_seed
)
244 /* Try urandom first. Time of day is too likely to collide.
245 In case of any error we just use the local tick. */
247 int fd
= open ("/dev/urandom", O_RDONLY
);
250 read (fd
, &random_seed
, sizeof (random_seed
));
254 /* Now get the tick anyways */
255 #ifdef HAVE_GETTIMEOFDAY
259 gettimeofday (&tv
, NULL
);
260 local_tick
= tv
.tv_sec
* 1000 + tv
.tv_usec
/ 1000;
264 time_t now
= time (NULL
);
266 if (now
!= (time_t)-1)
267 local_tick
= (unsigned) now
;
275 /* Set up a default flag_random_seed and local_tick, unless the user
276 already specified one. Must be called after init_local_tick. */
279 init_random_seed (void)
281 if (flag_random_seed
)
285 /* When the driver passed in a hex number don't crc it again */
286 random_seed
= strtoul (flag_random_seed
, &endp
, 0);
287 if (!(endp
> flag_random_seed
&& *endp
== 0))
288 random_seed
= crc32_string (0, flag_random_seed
);
290 else if (!random_seed
)
291 random_seed
= local_tick
^ getpid (); /* Old racey fallback method */
294 /* Obtain the random_seed. Unless NOINIT, initialize it if
295 it's not provided in the command line. */
298 get_random_seed (bool noinit
)
300 if (!flag_random_seed
&& !noinit
)
305 /* Modify the random_seed string to VAL. Return its previous
309 set_random_seed (const char *val
)
311 const char *old
= flag_random_seed
;
312 flag_random_seed
= val
;
316 /* Handler for fatal signals, such as SIGSEGV. These are transformed
317 into ICE messages, which is much more user friendly. In case the
318 error printer crashes, reset the signal to prevent infinite recursion. */
321 crash_signal (int signo
)
323 signal (signo
, SIG_DFL
);
325 /* If we crashed while processing an ASM statement, then be a little more
326 graceful. It's most likely the user's fault. */
327 if (this_is_asm_operands
)
329 output_operand_lossage ("unrecoverable error");
330 exit (FATAL_EXIT_CODE
);
333 internal_error ("%s", strsignal (signo
));
336 /* A subroutine of wrapup_global_declarations. We've come to the end of
337 the compilation unit. All deferred variables should be undeferred,
338 and all incomplete decls should be finalized. */
341 wrapup_global_declaration_1 (tree decl
)
343 /* We're not deferring this any longer. Assignment is conditional to
344 avoid needlessly dirtying PCH pages. */
345 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl
), TS_DECL_WITH_VIS
)
346 && DECL_DEFER_OUTPUT (decl
) != 0)
347 DECL_DEFER_OUTPUT (decl
) = 0;
349 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0)
350 lang_hooks
.finish_incomplete_decl (decl
);
353 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
354 needs to be output. Return true if it is output. */
357 wrapup_global_declaration_2 (tree decl
)
359 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
)
360 || (TREE_CODE (decl
) == VAR_DECL
&& DECL_HAS_VALUE_EXPR_P (decl
)))
363 /* Don't write out static consts, unless we still need them.
365 We also keep static consts if not optimizing (for debugging),
366 unless the user specified -fno-keep-static-consts.
367 ??? They might be better written into the debug information.
368 This is possible when using DWARF.
370 A language processor that wants static constants to be always
371 written out (even if it is not used) is responsible for
372 calling rest_of_decl_compilation itself. E.g. the C front-end
373 calls rest_of_decl_compilation from finish_decl.
374 One motivation for this is that is conventional in some
375 environments to write things like:
376 static const char rcsid[] = "... version string ...";
377 intending to force the string to be in the executable.
379 A language processor that would prefer to have unneeded
380 static constants "optimized away" would just defer writing
381 them out until here. E.g. C++ does this, because static
382 constants are often defined in header files.
384 ??? A tempting alternative (for both C and C++) would be
385 to force a constant to be written if and only if it is
386 defined in a main file, as opposed to an include file. */
388 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
390 struct varpool_node
*node
;
392 node
= varpool_get_node (decl
);
394 if (!node
&& flag_ltrans
)
396 else if (node
&& node
->finalized
)
398 else if (node
&& node
->alias
)
400 else if (!cgraph_global_info_ready
402 || TREE_USED (DECL_ASSEMBLER_NAME (decl
))))
404 else if (node
&& node
->analyzed
)
406 else if (DECL_COMDAT (decl
))
408 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
409 && (optimize
|| !flag_keep_static_consts
410 || DECL_ARTIFICIAL (decl
)))
415 rest_of_decl_compilation (decl
, 1, 1);
423 /* Do any final processing required for the declarations in VEC, of
424 which there are LEN. We write out inline functions and variables
425 that have been deferred until this point, but which are required.
426 Returns nonzero if anything was put out. */
429 wrapup_global_declarations (tree
*vec
, int len
)
431 bool reconsider
, output_something
= false;
434 for (i
= 0; i
< len
; i
++)
435 wrapup_global_declaration_1 (vec
[i
]);
437 /* Now emit any global variables or functions that we have been
438 putting off. We need to loop in case one of the things emitted
439 here references another one which comes earlier in the list. */
443 for (i
= 0; i
< len
; i
++)
444 reconsider
|= wrapup_global_declaration_2 (vec
[i
]);
446 output_something
= true;
450 return output_something
;
453 /* A subroutine of check_global_declarations. Issue appropriate warnings
454 for the global declaration DECL. */
457 check_global_declaration_1 (tree decl
)
459 /* Warn about any function declared static but not defined. We don't
460 warn about variables, because many programs have static variables
461 that exist only to get some text into the object file. */
462 if (TREE_CODE (decl
) == FUNCTION_DECL
463 && DECL_INITIAL (decl
) == 0
464 && DECL_EXTERNAL (decl
)
465 && ! DECL_ARTIFICIAL (decl
)
466 && ! TREE_NO_WARNING (decl
)
467 && ! TREE_PUBLIC (decl
)
468 && (warn_unused_function
469 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
471 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
472 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
474 warning (OPT_Wunused_function
, "%q+F declared %<static%> but never defined", decl
);
475 /* This symbol is effectively an "extern" declaration now. */
476 TREE_PUBLIC (decl
) = 1;
479 /* Warn about static fns or vars defined but not used. */
480 if (((warn_unused_function
&& TREE_CODE (decl
) == FUNCTION_DECL
)
481 /* We don't warn about "static const" variables because the
482 "rcs_id" idiom uses that construction. */
483 || (warn_unused_variable
484 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
485 && ! DECL_IN_SYSTEM_HEADER (decl
)
486 && ! TREE_USED (decl
)
487 /* The TREE_USED bit for file-scope decls is kept in the identifier,
488 to handle multiple external decls in different scopes. */
489 && ! (DECL_NAME (decl
) && TREE_USED (DECL_NAME (decl
)))
490 && ! DECL_EXTERNAL (decl
)
491 && ! TREE_PUBLIC (decl
)
492 /* A volatile variable might be used in some non-obvious way. */
493 && ! TREE_THIS_VOLATILE (decl
)
494 /* Global register variables must be declared to reserve them. */
495 && ! (TREE_CODE (decl
) == VAR_DECL
&& DECL_REGISTER (decl
))
496 /* Otherwise, ask the language. */
497 && lang_hooks
.decls
.warn_unused_global (decl
))
498 warning ((TREE_CODE (decl
) == FUNCTION_DECL
)
499 ? OPT_Wunused_function
500 : OPT_Wunused_variable
,
501 "%q+D defined but not used", decl
);
504 /* Issue appropriate warnings for the global declarations in VEC (of
505 which there are LEN). */
508 check_global_declarations (tree
*vec
, int len
)
512 for (i
= 0; i
< len
; i
++)
513 check_global_declaration_1 (vec
[i
]);
516 /* Emit debugging information for all global declarations in VEC. */
519 emit_debug_global_declarations (tree
*vec
, int len
)
523 /* Avoid confusing the debug information machinery when there are errors. */
527 timevar_push (TV_SYMOUT
);
528 for (i
= 0; i
< len
; i
++)
529 debug_hooks
->global_decl (vec
[i
]);
530 timevar_pop (TV_SYMOUT
);
533 /* Compile an entire translation unit. Write a file of assembly
534 output and various debugging dumps. */
539 timevar_start (TV_PHASE_PARSING
);
540 timevar_push (TV_PARSE_GLOBAL
);
542 /* Call the parser, which parses the entire file (calling
543 rest_of_compilation for each function). */
544 lang_hooks
.parse_file ();
546 timevar_pop (TV_PARSE_GLOBAL
);
547 timevar_stop (TV_PHASE_PARSING
);
549 /* Compilation is now finished except for writing
550 what's left of the symbol table output. */
552 if (flag_syntax_only
|| flag_wpa
)
555 ggc_protect_identifiers
= false;
557 /* This must also call finalize_compilation_unit. */
558 lang_hooks
.decls
.final_write_globals ();
563 timevar_start (TV_PHASE_LATE_ASM
);
565 /* Compilation unit is finalized. When producing non-fat LTO object, we are
566 basically finished. */
567 if (in_lto_p
|| !flag_lto
|| flag_fat_lto_objects
)
569 /* Likewise for mudflap static object registrations. */
571 mudflap_finish_file ();
573 output_shared_constant_pool ();
574 output_object_blocks ();
575 finish_tm_clone_pairs ();
577 /* Write out any pending weak symbol declarations. */
580 /* This must be at the end before unwind and debug info.
581 Some target ports emit PIC setup thunks here. */
582 targetm
.asm_out
.code_end ();
584 /* Do dbx symbols. */
585 timevar_push (TV_SYMOUT
);
587 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
588 if (dwarf2out_do_frame ())
589 dwarf2out_frame_finish ();
592 (*debug_hooks
->finish
) (main_input_filename
);
593 timevar_pop (TV_SYMOUT
);
595 /* Output some stuff at end of file if nec. */
597 dw2_output_indirect_constants ();
599 /* Flush any pending external directives. */
600 process_pending_assemble_externals ();
603 /* Emit LTO marker if LTO info has been previously emitted. This is
604 used by collect2 to determine whether an object file contains IL.
605 We used to emit an undefined reference here, but this produces
606 link errors if an object file with IL is stored into a shared
607 library without invoking lto1. */
608 if (flag_generate_lto
)
610 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
611 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
,
613 (unsigned HOST_WIDE_INT
) 1, 8);
614 #elif defined ASM_OUTPUT_ALIGNED_COMMON
615 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_v1",
616 (unsigned HOST_WIDE_INT
) 1, 8);
618 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_v1",
619 (unsigned HOST_WIDE_INT
) 1,
620 (unsigned HOST_WIDE_INT
) 1);
622 /* Let linker plugin know that this is a slim object and must be LTOed
623 even when user did not ask for it. */
624 if (!flag_fat_lto_objects
)
626 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
627 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
,
629 (unsigned HOST_WIDE_INT
) 1, 8);
630 #elif defined ASM_OUTPUT_ALIGNED_COMMON
631 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_slim",
632 (unsigned HOST_WIDE_INT
) 1, 8);
634 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_slim",
635 (unsigned HOST_WIDE_INT
) 1,
636 (unsigned HOST_WIDE_INT
) 1);
641 /* Attach a special .ident directive to the end of the file to identify
642 the version of GCC which compiled this code. The format of the .ident
643 string is patterned after the ones produced by native SVR4 compilers. */
646 const char *pkg_version
= "(GNU) ";
649 if (strcmp ("(GCC) ", pkgversion_string
))
650 pkg_version
= pkgversion_string
;
652 ident_str
= ACONCAT (("GCC: ", pkg_version
, version_string
, NULL
));
653 targetm
.asm_out
.output_ident (ident_str
);
656 /* Invoke registered plugin callbacks. */
657 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT
, NULL
);
659 /* This must be at the end. Some target ports emit end of file directives
660 into the assembly file here, and hence we can not output anything to the
661 assembly file after this point. */
662 targetm
.asm_out
.file_end ();
664 timevar_stop (TV_PHASE_LATE_ASM
);
667 /* Print version information to FILE.
668 Each line begins with INDENT (for the case where FILE is the
669 assembler output file). */
672 print_version (FILE *file
, const char *indent
)
674 static const char fmt1
[] =
676 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
678 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
681 static const char fmt2
[] =
682 N_("GMP version %s, MPFR version %s, MPC version %s\n");
683 static const char fmt3
[] =
684 N_("%s%swarning: %s header version %s differs from library version %s.\n");
685 static const char fmt4
[] =
686 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
688 #define __VERSION__ "[?]"
691 file
== stderr
? _(fmt1
) : fmt1
,
692 indent
, *indent
!= 0 ? " " : "",
693 lang_hooks
.name
, pkgversion_string
, version_string
, TARGET_NAME
,
694 indent
, __VERSION__
);
696 /* We need to stringify the GMP macro values. Ugh, gmp_version has
697 two string formats, "i.j.k" and "i.j" when k is zero. As of
698 gmp-4.3.0, GMP always uses the 3 number format. */
699 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
700 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3(X)
701 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
702 #define GCC_GMP_VERSION \
703 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
704 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
705 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
706 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR)
708 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
709 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) "." \
710 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_PATCHLEVEL)
713 file
== stderr
? _(fmt2
) : fmt2
,
714 GCC_GMP_STRINGIFY_VERSION
, MPFR_VERSION_STRING
, MPC_VERSION_STRING
);
715 if (strcmp (GCC_GMP_STRINGIFY_VERSION
, gmp_version
))
717 file
== stderr
? _(fmt3
) : fmt3
,
718 indent
, *indent
!= 0 ? " " : "",
719 "GMP", GCC_GMP_STRINGIFY_VERSION
, gmp_version
);
720 if (strcmp (MPFR_VERSION_STRING
, mpfr_get_version ()))
722 file
== stderr
? _(fmt3
) : fmt3
,
723 indent
, *indent
!= 0 ? " " : "",
724 "MPFR", MPFR_VERSION_STRING
, mpfr_get_version ());
725 if (strcmp (MPC_VERSION_STRING
, mpc_get_version ()))
727 file
== stderr
? _(fmt3
) : fmt3
,
728 indent
, *indent
!= 0 ? " " : "",
729 "MPC", MPC_VERSION_STRING
, mpc_get_version ());
731 file
== stderr
? _(fmt4
) : fmt4
,
732 indent
, *indent
!= 0 ? " " : "",
733 PARAM_VALUE (GGC_MIN_EXPAND
), PARAM_VALUE (GGC_MIN_HEAPSIZE
));
735 print_plugins_versions (file
, indent
);
739 print_to_asm_out_file (print_switch_type type
, const char * text
)
741 bool prepend_sep
= true;
745 case SWITCH_TYPE_LINE_END
:
746 putc ('\n', asm_out_file
);
749 case SWITCH_TYPE_LINE_START
:
750 fputs (ASM_COMMENT_START
, asm_out_file
);
751 return strlen (ASM_COMMENT_START
);
753 case SWITCH_TYPE_DESCRIPTIVE
:
754 if (ASM_COMMENT_START
[0] == 0)
757 case SWITCH_TYPE_PASSED
:
758 case SWITCH_TYPE_ENABLED
:
760 fputc (' ', asm_out_file
);
761 fputs (text
, asm_out_file
);
762 /* No need to return the length here as
763 print_single_switch has already done it. */
772 print_to_stderr (print_switch_type type
, const char * text
)
776 case SWITCH_TYPE_LINE_END
:
780 case SWITCH_TYPE_LINE_START
:
783 case SWITCH_TYPE_PASSED
:
784 case SWITCH_TYPE_ENABLED
:
788 case SWITCH_TYPE_DESCRIPTIVE
:
789 fputs (text
, stderr
);
790 /* No need to return the length here as
791 print_single_switch has already done it. */
799 /* Print an option value and return the adjusted position in the line.
800 ??? print_fn doesn't handle errors, eg disk full; presumably other
801 code will catch a disk full though. */
804 print_single_switch (print_switch_fn_type print_fn
,
806 print_switch_type type
,
809 /* The ultrix fprintf returns 0 on success, so compute the result
810 we want here since we need it for the following test. The +1
811 is for the separator character that will probably be emitted. */
812 int len
= strlen (text
) + 1;
815 && pos
+ len
> MAX_LINE
)
817 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
822 pos
+= print_fn (SWITCH_TYPE_LINE_START
, NULL
);
824 print_fn (type
, text
);
828 /* Print active target switches using PRINT_FN.
829 POS is the current cursor position and MAX is the size of a "line".
830 Each line begins with INDENT and ends with TERM.
831 Each switch is separated from the next by SEP. */
834 print_switch_values (print_switch_fn_type print_fn
)
839 /* Fill in the -frandom-seed option, if the user didn't pass it, so
840 that it can be printed below. This helps reproducibility. */
841 if (!flag_random_seed
)
844 /* Print the options as passed. */
845 pos
= print_single_switch (print_fn
, pos
,
846 SWITCH_TYPE_DESCRIPTIVE
, _("options passed: "));
848 for (j
= 1; j
< save_decoded_options_count
; j
++)
850 switch (save_decoded_options
[j
].opt_index
)
863 pos
= print_single_switch (print_fn
, pos
, SWITCH_TYPE_PASSED
,
864 save_decoded_options
[j
].orig_option_with_args_text
);
868 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
870 /* Print the -f and -m options that have been enabled.
871 We don't handle language specific options but printing argv
873 pos
= print_single_switch (print_fn
, 0,
874 SWITCH_TYPE_DESCRIPTIVE
, _("options enabled: "));
876 for (j
= 0; j
< cl_options_count
; j
++)
877 if (cl_options
[j
].cl_report
878 && option_enabled (j
, &global_options
) > 0)
879 pos
= print_single_switch (print_fn
, pos
,
880 SWITCH_TYPE_ENABLED
, cl_options
[j
].opt_text
);
882 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
885 /* Open assembly code output file. Do this even if -fsyntax-only is
886 on, because then the driver will have provided the name of a
887 temporary file or bit bucket for us. NAME is the file specified on
888 the command line, possibly NULL. */
890 init_asm_output (const char *name
)
892 if (name
== NULL
&& asm_file_name
== 0)
893 asm_out_file
= stdout
;
896 if (asm_file_name
== 0)
898 int len
= strlen (dump_base_name
);
899 char *dumpname
= XNEWVEC (char, len
+ 6);
901 memcpy (dumpname
, dump_base_name
, len
+ 1);
902 strip_off_ending (dumpname
, len
);
903 strcat (dumpname
, ".s");
904 asm_file_name
= dumpname
;
906 if (!strcmp (asm_file_name
, "-"))
907 asm_out_file
= stdout
;
909 asm_out_file
= fopen (asm_file_name
, "w");
910 if (asm_out_file
== 0)
911 fatal_error ("can%'t open %s for writing: %m", asm_file_name
);
914 if (!flag_syntax_only
)
916 targetm
.asm_out
.file_start ();
918 if (flag_record_gcc_switches
)
920 if (targetm
.asm_out
.record_gcc_switches
)
922 /* Let the target know that we are about to start recording. */
923 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
925 /* Now record the switches. */
926 print_switch_values (targetm
.asm_out
.record_gcc_switches
);
927 /* Let the target know that the recording is over. */
928 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
932 inform (input_location
, "-frecord-gcc-switches is not supported by the current target");
935 if (flag_verbose_asm
)
937 /* Print the list of switches in effect
938 into the assembler file as comments. */
939 print_version (asm_out_file
, ASM_COMMENT_START
);
940 print_switch_values (print_to_asm_out_file
);
941 putc ('\n', asm_out_file
);
946 /* A helper function; used as the reallocator function for cpp's line
949 realloc_for_line_map (void *ptr
, size_t len
)
951 return GGC_RESIZEVAR (void, ptr
, len
);
954 /* A helper function: used as the allocator function for
955 identifier_to_locale. */
957 alloc_for_identifier_to_locale (size_t len
)
959 return ggc_alloc_atomic (len
);
962 /* Output stack usage information. */
964 output_stack_usage (void)
966 static bool warning_issued
= false;
967 enum stack_usage_kind_type
{ STATIC
= 0, DYNAMIC
, DYNAMIC_BOUNDED
};
968 const char *stack_usage_kind_str
[] = {
973 HOST_WIDE_INT stack_usage
= current_function_static_stack_size
;
974 enum stack_usage_kind_type stack_usage_kind
;
980 warning (0, "stack usage computation not supported for this target");
981 warning_issued
= true;
986 stack_usage_kind
= STATIC
;
988 /* Add the maximum amount of space pushed onto the stack. */
989 if (current_function_pushed_stack_size
> 0)
991 stack_usage
+= current_function_pushed_stack_size
;
992 stack_usage_kind
= DYNAMIC_BOUNDED
;
995 /* Now on to the tricky part: dynamic stack allocation. */
996 if (current_function_allocates_dynamic_stack_space
)
998 if (current_function_has_unbounded_dynamic_stack_size
)
999 stack_usage_kind
= DYNAMIC
;
1001 stack_usage_kind
= DYNAMIC_BOUNDED
;
1003 /* Add the size even in the unbounded case, this can't hurt. */
1004 stack_usage
+= current_function_dynamic_stack_size
;
1007 if (flag_stack_usage
)
1009 expanded_location loc
1010 = expand_location (DECL_SOURCE_LOCATION (current_function_decl
));
1011 const char *raw_id
, *id
;
1013 /* Strip the scope prefix if any. */
1014 raw_id
= lang_hooks
.decl_printable_name (current_function_decl
, 2);
1015 id
= strrchr (raw_id
, '.');
1021 fprintf (stack_usage_file
,
1022 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC
"\t%s\n",
1023 lbasename (loc
.file
),
1028 stack_usage_kind_str
[stack_usage_kind
]);
1031 if (warn_stack_usage
>= 0)
1033 if (stack_usage_kind
== DYNAMIC
)
1034 warning (OPT_Wstack_usage_
, "stack usage might be unbounded");
1035 else if (stack_usage
> warn_stack_usage
)
1037 if (stack_usage_kind
== DYNAMIC_BOUNDED
)
1038 warning (OPT_Wstack_usage_
, "stack usage might be %wd bytes",
1041 warning (OPT_Wstack_usage_
, "stack usage is %wd bytes",
1047 /* Open an auxiliary output file. */
1049 open_auxiliary_file (const char *ext
)
1054 filename
= concat (aux_base_name
, ".", ext
, NULL
);
1055 file
= fopen (filename
, "w");
1057 fatal_error ("can%'t open %s for writing: %m", filename
);
1062 /* Initialization of the front end environment, before command line
1063 options are parsed. Signal handlers, internationalization etc.
1064 ARGV0 is main's argv[0]. */
1066 general_init (const char *argv0
)
1070 p
= argv0
+ strlen (argv0
);
1071 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
1075 xmalloc_set_program_name (progname
);
1079 /* Unlock the stdio streams. */
1080 unlock_std_streams ();
1082 gcc_init_libintl ();
1084 identifier_to_locale_alloc
= alloc_for_identifier_to_locale
;
1085 identifier_to_locale_free
= ggc_free
;
1087 /* Initialize the diagnostics reporting machinery, so option parsing
1088 can give warnings and errors. */
1089 diagnostic_initialize (global_dc
, N_OPTS
);
1090 /* Set a default printer. Language specific initializations will
1091 override it later. */
1092 tree_diagnostics_defaults (global_dc
);
1093 /* FIXME: This should probably be moved to C-family
1094 language-specific initializations. */
1095 /* By default print macro expansion contexts in the diagnostic
1096 finalizer -- for tokens resulting from macro expansion. */
1097 diagnostic_finalizer (global_dc
) = virt_loc_aware_diagnostic_finalizer
;
1099 global_dc
->show_caret
1100 = global_options_init
.x_flag_diagnostics_show_caret
;
1101 global_dc
->show_option_requested
1102 = global_options_init
.x_flag_diagnostics_show_option
;
1103 global_dc
->show_column
1104 = global_options_init
.x_flag_show_column
;
1105 global_dc
->internal_error
= plugins_internal_error_function
;
1106 global_dc
->option_enabled
= option_enabled
;
1107 global_dc
->option_state
= &global_options
;
1108 global_dc
->option_name
= option_name
;
1110 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1112 signal (SIGSEGV
, crash_signal
);
1115 signal (SIGILL
, crash_signal
);
1118 signal (SIGBUS
, crash_signal
);
1121 signal (SIGABRT
, crash_signal
);
1123 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1124 signal (SIGIOT
, crash_signal
);
1127 signal (SIGFPE
, crash_signal
);
1130 /* Other host-specific signal setup. */
1131 (*host_hooks
.extra_signals
)();
1133 /* Initialize the garbage-collector, string pools and tree type hash
1137 line_table
= ggc_alloc_line_maps ();
1138 linemap_init (line_table
);
1139 line_table
->reallocator
= realloc_for_line_map
;
1140 line_table
->round_alloc_size
= ggc_round_alloc_size
;
1143 /* Initialize register usage now so switches may override. */
1146 /* Register the language-independent parameters. */
1147 global_init_params ();
1149 /* This must be done after global_init_params but before argument
1151 init_ggc_heuristics();
1152 init_optimization_passes ();
1153 statistics_early_init ();
1157 /* Return true if the current target supports -fsection-anchors. */
1160 target_supports_section_anchors_p (void)
1162 if (targetm
.min_anchor_offset
== 0 && targetm
.max_anchor_offset
== 0)
1165 if (targetm
.asm_out
.output_anchor
== NULL
)
1171 /* Default the align_* variables to 1 if they're still unset, and
1172 set up the align_*_log variables. */
1174 init_alignments (void)
1176 if (align_loops
<= 0)
1178 if (align_loops_max_skip
> align_loops
)
1179 align_loops_max_skip
= align_loops
- 1;
1180 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
1181 if (align_jumps
<= 0)
1183 if (align_jumps_max_skip
> align_jumps
)
1184 align_jumps_max_skip
= align_jumps
- 1;
1185 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
1186 if (align_labels
<= 0)
1188 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
1189 if (align_labels_max_skip
> align_labels
)
1190 align_labels_max_skip
= align_labels
- 1;
1191 if (align_functions
<= 0)
1192 align_functions
= 1;
1193 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
1196 /* Process the options that have been parsed. */
1198 process_options (void)
1200 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1201 This can happen with incorrect pre-processed input. */
1202 debug_hooks
= &do_nothing_debug_hooks
;
1204 maximum_field_alignment
= initial_max_fld_align
* BITS_PER_UNIT
;
1206 /* Allow the front end to perform consistency checks and do further
1207 initialization based on the command line options. This hook also
1208 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1209 so we can correctly initialize debug output. */
1210 no_backend
= lang_hooks
.post_options (&main_input_filename
);
1212 /* Some machines may reject certain combinations of options. */
1213 targetm
.target_option
.override ();
1215 /* Avoid any informative notes in the second run of -fcompare-debug. */
1216 if (flag_compare_debug
)
1217 diagnostic_inhibit_notes (global_dc
);
1219 if (flag_section_anchors
&& !target_supports_section_anchors_p ())
1221 warning (OPT_fsection_anchors
,
1222 "this target does not support %qs", "-fsection-anchors");
1223 flag_section_anchors
= 0;
1226 if (flag_short_enums
== 2)
1227 flag_short_enums
= targetm
.default_short_enums ();
1229 /* Set aux_base_name if not already set. */
1232 else if (main_input_filename
)
1234 char *name
= xstrdup (lbasename (main_input_filename
));
1236 strip_off_ending (name
, strlen (name
));
1237 aux_base_name
= name
;
1240 aux_base_name
= "gccaux";
1244 || flag_graphite_identity
1246 || flag_loop_interchange
1247 || flag_loop_strip_mine
1248 || flag_loop_parallelize_all
)
1249 sorry ("Graphite loop optimizations cannot be used (-fgraphite, "
1250 "-fgraphite-identity, -floop-block, "
1251 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1252 "and -ftree-loop-linear)");
1255 if (flag_mudflap
&& flag_lto
)
1256 sorry ("mudflap cannot be used together with link-time optimization");
1258 /* One region RA really helps to decrease the code size. */
1259 if (flag_ira_region
== IRA_REGION_AUTODETECT
)
1261 = optimize_size
|| !optimize
? IRA_REGION_ONE
: IRA_REGION_MIXED
;
1263 if (flag_strict_volatile_bitfields
> 0 && !abi_version_at_least (2))
1265 warning (0, "-fstrict-volatile-bitfields disabled; "
1266 "it is incompatible with ABI versions < 2");
1267 flag_strict_volatile_bitfields
= 0;
1270 /* Unrolling all loops implies that standard loop unrolling must also
1272 if (flag_unroll_all_loops
)
1273 flag_unroll_loops
= 1;
1275 /* web and rename-registers help when run after loop unrolling. */
1276 if (flag_web
== AUTODETECT_VALUE
)
1277 flag_web
= flag_unroll_loops
|| flag_peel_loops
;
1279 if (flag_rename_registers
== AUTODETECT_VALUE
)
1280 flag_rename_registers
= flag_unroll_loops
|| flag_peel_loops
;
1282 if (flag_non_call_exceptions
)
1283 flag_asynchronous_unwind_tables
= 1;
1284 if (flag_asynchronous_unwind_tables
)
1285 flag_unwind_tables
= 1;
1287 if (flag_value_profile_transformations
)
1288 flag_profile_values
= 1;
1290 /* Warn about options that are not supported on this machine. */
1291 #ifndef INSN_SCHEDULING
1292 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
1293 warning (0, "instruction scheduling not supported on this target machine");
1296 if (flag_delayed_branch
)
1297 warning (0, "this target machine does not have delayed branches");
1300 user_label_prefix
= USER_LABEL_PREFIX
;
1301 if (flag_leading_underscore
!= -1)
1303 /* If the default prefix is more complicated than "" or "_",
1304 issue a warning and ignore this option. */
1305 if (user_label_prefix
[0] == 0 ||
1306 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
1308 user_label_prefix
= flag_leading_underscore
? "_" : "";
1311 warning (0, "-f%sleading-underscore not supported on this target machine",
1312 flag_leading_underscore
? "" : "no-");
1315 /* If we are in verbose mode, write out the version and maybe all the
1316 option flags in use. */
1319 print_version (stderr
, "");
1321 print_switch_values (print_to_stderr
);
1324 if (flag_syntax_only
)
1326 write_symbols
= NO_DEBUG
;
1332 if (debug_info_level
== DINFO_LEVEL_NONE
)
1334 debug_info_level
= DINFO_LEVEL_NORMAL
;
1336 if (write_symbols
== NO_DEBUG
)
1337 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
1340 debug_info_level
= DINFO_LEVEL_NONE
;
1343 if (flag_dump_final_insns
&& !flag_syntax_only
&& !no_backend
)
1345 FILE *final_output
= fopen (flag_dump_final_insns
, "w");
1348 error ("could not open final insn dump file %qs: %m",
1349 flag_dump_final_insns
);
1350 flag_dump_final_insns
= NULL
;
1352 else if (fclose (final_output
))
1354 error ("could not close zeroed insn dump file %qs: %m",
1355 flag_dump_final_insns
);
1356 flag_dump_final_insns
= NULL
;
1360 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1362 if (debug_info_level
== DINFO_LEVEL_NONE
)
1363 write_symbols
= NO_DEBUG
;
1365 if (write_symbols
== NO_DEBUG
)
1367 #if defined(DBX_DEBUGGING_INFO)
1368 else if (write_symbols
== DBX_DEBUG
)
1369 debug_hooks
= &dbx_debug_hooks
;
1371 #if defined(XCOFF_DEBUGGING_INFO)
1372 else if (write_symbols
== XCOFF_DEBUG
)
1373 debug_hooks
= &xcoff_debug_hooks
;
1375 #ifdef SDB_DEBUGGING_INFO
1376 else if (write_symbols
== SDB_DEBUG
)
1377 debug_hooks
= &sdb_debug_hooks
;
1379 #ifdef DWARF2_DEBUGGING_INFO
1380 else if (write_symbols
== DWARF2_DEBUG
)
1381 debug_hooks
= &dwarf2_debug_hooks
;
1383 #ifdef VMS_DEBUGGING_INFO
1384 else if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1385 debug_hooks
= &vmsdbg_debug_hooks
;
1388 error ("target system does not support the \"%s\" debug format",
1389 debug_type_names
[write_symbols
]);
1391 /* We know which debug output will be used so we can set flag_var_tracking
1392 and flag_var_tracking_uninit if the user has not specified them. */
1393 if (debug_info_level
< DINFO_LEVEL_NORMAL
1394 || debug_hooks
->var_location
== do_nothing_debug_hooks
.var_location
)
1396 if (flag_var_tracking
== 1
1397 || flag_var_tracking_uninit
== 1)
1399 if (debug_info_level
< DINFO_LEVEL_NORMAL
)
1400 warning (0, "variable tracking requested, but useless unless "
1401 "producing debug info");
1403 warning (0, "variable tracking requested, but not supported "
1404 "by this debug format");
1406 flag_var_tracking
= 0;
1407 flag_var_tracking_uninit
= 0;
1410 /* The debug hooks are used to implement -fdump-go-spec because it
1411 gives a simple and stable API for all the information we need to
1413 if (flag_dump_go_spec
!= NULL
)
1414 debug_hooks
= dump_go_spec_init (flag_dump_go_spec
, debug_hooks
);
1416 /* If the user specifically requested variable tracking with tagging
1417 uninitialized variables, we need to turn on variable tracking.
1418 (We already determined above that variable tracking is feasible.) */
1419 if (flag_var_tracking_uninit
)
1420 flag_var_tracking
= 1;
1422 if (flag_var_tracking
== AUTODETECT_VALUE
)
1423 flag_var_tracking
= optimize
>= 1;
1425 if (flag_var_tracking_assignments
== AUTODETECT_VALUE
)
1426 flag_var_tracking_assignments
= flag_var_tracking
1427 && !(flag_selective_scheduling
|| flag_selective_scheduling2
);
1429 if (flag_var_tracking_assignments_toggle
)
1430 flag_var_tracking_assignments
= !flag_var_tracking_assignments
;
1432 if (flag_var_tracking_assignments
&& !flag_var_tracking
)
1433 flag_var_tracking
= flag_var_tracking_assignments
= -1;
1435 if (flag_var_tracking_assignments
1436 && (flag_selective_scheduling
|| flag_selective_scheduling2
))
1437 warning (0, "var-tracking-assignments changes selective scheduling");
1439 if (flag_tree_cselim
== AUTODETECT_VALUE
)
1440 #ifdef HAVE_conditional_move
1441 flag_tree_cselim
= 1;
1443 flag_tree_cselim
= 0;
1446 /* If auxiliary info generation is desired, open the output file.
1447 This goes in the same directory as the source file--unlike
1448 all the other output files. */
1449 if (flag_gen_aux_info
)
1451 aux_info_file
= fopen (aux_info_file_name
, "w");
1452 if (aux_info_file
== 0)
1453 fatal_error ("can%'t open %s: %m", aux_info_file_name
);
1456 if (!targetm_common
.have_named_sections
)
1458 if (flag_function_sections
)
1460 warning (0, "-ffunction-sections not supported for this target");
1461 flag_function_sections
= 0;
1463 if (flag_data_sections
)
1465 warning (0, "-fdata-sections not supported for this target");
1466 flag_data_sections
= 0;
1470 if (flag_function_sections
&& profile_flag
)
1472 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
1473 flag_function_sections
= 0;
1476 #ifndef HAVE_prefetch
1477 if (flag_prefetch_loop_arrays
> 0)
1479 warning (0, "-fprefetch-loop-arrays not supported for this target");
1480 flag_prefetch_loop_arrays
= 0;
1483 if (flag_prefetch_loop_arrays
> 0 && !HAVE_prefetch
)
1485 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1486 flag_prefetch_loop_arrays
= 0;
1490 /* This combination of options isn't handled for i386 targets and doesn't
1491 make much sense anyway, so don't allow it. */
1492 if (flag_prefetch_loop_arrays
> 0 && optimize_size
)
1494 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1495 flag_prefetch_loop_arrays
= 0;
1498 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1499 if (flag_signaling_nans
)
1500 flag_trapping_math
= 1;
1502 /* We cannot reassociate if we want traps or signed zeros. */
1503 if (flag_associative_math
&& (flag_trapping_math
|| flag_signed_zeros
))
1505 warning (0, "-fassociative-math disabled; other options take precedence");
1506 flag_associative_math
= 0;
1509 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1510 if (flag_cx_limited_range
)
1511 flag_complex_method
= 0;
1513 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1514 if (flag_cx_fortran_rules
)
1515 flag_complex_method
= 1;
1517 /* Targets must be able to place spill slots at lower addresses. If the
1518 target already uses a soft frame pointer, the transition is trivial. */
1519 if (!FRAME_GROWS_DOWNWARD
&& flag_stack_protect
)
1521 warning (0, "-fstack-protector not supported for this target");
1522 flag_stack_protect
= 0;
1524 if (!flag_stack_protect
)
1525 warn_stack_protect
= 0;
1527 /* ??? Unwind info is not correct around the CFG unless either a frame
1528 pointer is present or A_O_A is set. Fixing this requires rewriting
1529 unwind info generation to be aware of the CFG and propagating states
1531 if (flag_unwind_tables
&& !ACCUMULATE_OUTGOING_ARGS
1532 && flag_omit_frame_pointer
)
1534 warning (0, "unwind tables currently require a frame pointer "
1536 flag_omit_frame_pointer
= 0;
1539 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1540 have not been set. */
1541 if (!global_options_set
.x_warnings_are_errors
1542 && warn_coverage_mismatch
1543 && (global_dc
->classify_diagnostic
[OPT_Wcoverage_mismatch
] ==
1545 diagnostic_classify_diagnostic (global_dc
, OPT_Wcoverage_mismatch
,
1546 DK_ERROR
, UNKNOWN_LOCATION
);
1548 /* Save the current optimization options. */
1549 optimization_default_node
= build_optimization_node ();
1550 optimization_current_node
= optimization_default_node
;
1553 /* This function can be called multiple times to reinitialize the compiler
1554 back end when register classes or instruction sets have changed,
1555 before each function. */
1557 backend_init_target (void)
1559 /* Initialize alignment variables. */
1562 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
1563 to initialize reg_raw_mode[]. */
1566 /* This invokes target hooks to set fixed_reg[] etc, which is
1570 /* This depends on stack_pointer_rtx. */
1571 init_fake_stack_mems ();
1573 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1575 init_alias_target ();
1577 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1580 /* The following initialization functions need to generate rtl, so
1581 provide a dummy function context for them. */
1582 init_dummy_function_start ();
1584 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1585 on a mode change. */
1587 init_lower_subreg ();
1589 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1590 after a mode change as well. */
1591 caller_save_initialized_p
= false;
1593 expand_dummy_function_end ();
1596 /* Initialize the compiler back end. This function is called only once,
1597 when starting the compiler. */
1604 init_inline_once ();
1605 init_varasm_once ();
1606 save_register_info ();
1608 /* Initialize the target-specific back end pieces. */
1610 backend_init_target ();
1613 /* Initialize excess precision settings. */
1615 init_excess_precision (void)
1617 /* Adjust excess precision handling based on the target options. If
1618 the front end cannot handle it, flag_excess_precision_cmdline
1619 will already have been set accordingly in the post_options
1621 gcc_assert (flag_excess_precision_cmdline
!= EXCESS_PRECISION_DEFAULT
);
1622 flag_excess_precision
= flag_excess_precision_cmdline
;
1623 if (flag_unsafe_math_optimizations
)
1624 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1625 if (flag_excess_precision
== EXCESS_PRECISION_STANDARD
)
1627 int flt_eval_method
= TARGET_FLT_EVAL_METHOD
;
1628 switch (flt_eval_method
)
1632 /* Either the target acts unpredictably (-1) or has all the
1633 operations required not to have excess precision (0). */
1634 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1638 /* In these cases, predictable excess precision makes
1642 /* Any other implementation-defined FLT_EVAL_METHOD values
1643 require the compiler to handle the associated excess
1644 precision rules in excess_precision_type. */
1650 /* Initialize things that are both lang-dependent and target-dependent.
1651 This function can be called more than once if target parameters change. */
1653 lang_dependent_init_target (void)
1655 /* This determines excess precision settings. */
1656 init_excess_precision ();
1658 /* This creates various _DECL nodes, so needs to be called after the
1659 front end is initialized. It also depends on the HAVE_xxx macros
1660 generated from the target machine description. */
1663 /* The following initialization functions need to generate rtl, so
1664 provide a dummy function context for them. */
1665 init_dummy_function_start ();
1667 /* Do the target-specific parts of expr initialization. */
1668 init_expr_target ();
1670 /* Although the actions of these functions are language-independent,
1671 they use optabs, so we cannot call them from backend_init. */
1675 expand_dummy_function_end ();
1678 /* Language-dependent initialization. Returns nonzero on success. */
1680 lang_dependent_init (const char *name
)
1682 location_t save_loc
= input_location
;
1683 if (dump_base_name
== 0)
1684 dump_base_name
= name
&& name
[0] ? name
: "gccdump";
1686 /* Other front-end initialization. */
1687 input_location
= BUILTINS_LOCATION
;
1688 if (lang_hooks
.init () == 0)
1690 input_location
= save_loc
;
1694 init_asm_output (name
);
1696 /* If stack usage information is desired, open the output file. */
1697 if (flag_stack_usage
)
1698 stack_usage_file
= open_auxiliary_file ("su");
1701 /* This creates various _DECL nodes, so needs to be called after the
1702 front end is initialized. */
1705 /* Do the target-specific parts of the initialization. */
1706 lang_dependent_init_target ();
1710 /* If dbx symbol table desired, initialize writing it and output the
1711 predefined types. */
1712 timevar_push (TV_SYMOUT
);
1714 /* Now we have the correct original filename, we can initialize
1716 (*debug_hooks
->init
) (name
);
1718 timevar_pop (TV_SYMOUT
);
1725 /* Reinitialize everything when target parameters, such as register usage,
1728 target_reinit (void)
1730 struct rtl_data saved_x_rtl
;
1731 rtx
*saved_regno_reg_rtx
;
1733 /* Save *crtl and regno_reg_rtx around the reinitialization
1734 to allow target_reinit being called even after prepare_function_start. */
1735 saved_regno_reg_rtx
= regno_reg_rtx
;
1736 if (saved_regno_reg_rtx
)
1738 saved_x_rtl
= *crtl
;
1739 memset (crtl
, '\0', sizeof (*crtl
));
1740 regno_reg_rtx
= NULL
;
1743 /* Reinitialize RTL backend. */
1744 backend_init_target ();
1746 /* Reinitialize lang-dependent parts. */
1747 lang_dependent_init_target ();
1749 /* And restore it at the end, as free_after_compilation from
1750 expand_dummy_function_end clears it. */
1751 if (saved_regno_reg_rtx
)
1753 *crtl
= saved_x_rtl
;
1754 regno_reg_rtx
= saved_regno_reg_rtx
;
1755 saved_regno_reg_rtx
= NULL
;
1760 dump_memory_report (bool final
)
1762 dump_line_table_statistics ();
1763 ggc_print_statistics ();
1764 stringpool_statistics ();
1765 dump_tree_statistics ();
1766 dump_gimple_statistics ();
1767 dump_rtx_statistics ();
1768 dump_alloc_pool_statistics ();
1769 dump_bitmap_statistics ();
1770 dump_vec_loc_statistics ();
1771 dump_ggc_loc_statistics (final
);
1772 dump_alias_stats (stderr
);
1773 dump_pta_stats (stderr
);
1776 /* Clean up: close opened files, etc. */
1779 finalize (bool no_backend
)
1781 /* Close the dump files. */
1782 if (flag_gen_aux_info
)
1784 fclose (aux_info_file
);
1786 unlink (aux_info_file_name
);
1789 /* Close non-debugging input and output files. Take special care to note
1790 whether fclose returns an error, since the pages might still be on the
1791 buffer chain while the file is open. */
1795 if (ferror (asm_out_file
) != 0)
1796 fatal_error ("error writing to %s: %m", asm_file_name
);
1797 if (fclose (asm_out_file
) != 0)
1798 fatal_error ("error closing %s: %m", asm_file_name
);
1801 if (stack_usage_file
)
1802 fclose (stack_usage_file
);
1808 finish_optimization_passes ();
1814 dump_memory_report (true);
1817 dump_profile_report ();
1819 /* Language-specific end of compilation actions. */
1820 lang_hooks
.finish ();
1823 /* Initialize the compiler, and compile the input file. */
1827 /* Initialize timing first. The C front ends read the main file in
1828 the post_options hook, and C++ does file timings. */
1829 if (time_report
|| !quiet_flag
|| flag_detailed_statistics
)
1831 timevar_start (TV_TOTAL
);
1835 /* Don't do any more if an error has already occurred. */
1838 timevar_start (TV_PHASE_SETUP
);
1840 /* This must be run always, because it is needed to compute the FP
1841 predefined macros, such as __LDBL_MAX__, for targets using non
1842 default FP formats. */
1843 init_adjust_machine_modes ();
1845 /* Set up the back-end if requested. */
1849 /* Language-dependent initialization. Returns true on success. */
1850 if (lang_dependent_init (main_input_filename
))
1852 /* Initialize yet another pass. */
1854 ggc_protect_identifiers
= true;
1857 init_final (main_input_filename
);
1858 coverage_init (aux_base_name
);
1860 invoke_plugin_callbacks (PLUGIN_START_UNIT
, NULL
);
1862 timevar_stop (TV_PHASE_SETUP
);
1868 timevar_stop (TV_PHASE_SETUP
);
1871 timevar_start (TV_PHASE_FINALIZE
);
1873 finalize (no_backend
);
1875 timevar_stop (TV_PHASE_FINALIZE
);
1878 /* Stop timing and print the times. */
1879 timevar_stop (TV_TOTAL
);
1880 timevar_print (stderr
);
1883 /* Entry point of cc1, cc1plus, jc1, f771, etc.
1884 Exit code is FATAL_EXIT_CODE if can't open files or if there were
1885 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
1887 It is not safe to call this function more than once. */
1890 toplev_main (int argc
, char **argv
)
1892 /* Parsing and gimplification sometimes need quite large stack.
1893 Increase stack size limits if possible. */
1894 stack_limit_increase (64 * 1024 * 1024);
1896 expandargv (&argc
, &argv
);
1898 /* Initialization of GCC's environment, and diagnostics. */
1899 general_init (argv
[0]);
1901 /* One-off initialization of options that does not need to be
1902 repeated when options are added for particular functions. */
1903 init_options_once ();
1905 /* Initialize global options structures; this must be repeated for
1906 each structure used for parsing options. */
1907 init_options_struct (&global_options
, &global_options_set
);
1908 lang_hooks
.init_options_struct (&global_options
);
1910 /* Convert the options to an array. */
1911 decode_cmdline_options_to_array_default_mask (argc
,
1912 CONST_CAST2 (const char **,
1914 &save_decoded_options
,
1915 &save_decoded_options_count
);
1917 /* Perform language-specific options initialization. */
1918 lang_hooks
.init_options (save_decoded_options_count
, save_decoded_options
);
1920 /* Parse the options and do minimal processing; basically just
1921 enough to default flags appropriately. */
1922 decode_options (&global_options
, &global_options_set
,
1923 save_decoded_options
, save_decoded_options_count
,
1924 UNKNOWN_LOCATION
, global_dc
);
1926 handle_common_deferred_options ();
1930 initialize_plugins ();
1933 print_version (stderr
, "");
1936 print_plugins_help (stderr
, "");
1938 /* Exit early if we can (e.g. -help). */
1939 if (!exit_after_options
)
1942 if (warningcount
|| errorcount
)
1943 print_ignored_options ();
1944 diagnostic_finish (global_dc
);
1946 /* Invoke registered plugin callbacks if any. */
1947 invoke_plugin_callbacks (PLUGIN_FINISH
, NULL
);
1949 finalize_plugins ();
1950 location_adhoc_data_fini (line_table
);
1952 return (FATAL_EXIT_CODE
);
1954 return (SUCCESS_EXIT_CODE
);