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"
62 #include "integrate.h"
65 #include "common/common-target.h"
66 #include "langhooks.h"
67 #include "cfglayout.h"
69 #include "hosthooks.h"
72 #include "opts-diagnostic.h"
74 #include "value-prof.h"
75 #include "alloc-pool.h"
76 #include "tree-mudflap.h"
78 #include "tree-ssa-alias.h"
81 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
82 #include "dwarf2out.h"
85 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
89 #ifdef SDB_DEBUGGING_INFO
93 #ifdef XCOFF_DEBUGGING_INFO
94 #include "xcoffout.h" /* Needed for external data
95 declarations for e.g. AIX 4.x. */
98 static void general_init (const char *);
99 static void do_compile (void);
100 static void process_options (void);
101 static void backend_init (void);
102 static int lang_dependent_init (const char *);
103 static void init_asm_output (const char *);
104 static void finalize (bool);
106 static void crash_signal (int) ATTRIBUTE_NORETURN
;
107 static void compile_file (void);
109 /* True if we don't need a backend (e.g. preprocessing only). */
110 static bool no_backend
;
112 /* Length of line when printing switch values. */
115 /* Decoded options, and number of such options. */
116 struct cl_decoded_option
*save_decoded_options
;
117 unsigned int save_decoded_options_count
;
119 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
120 to optimize in process_options (). */
121 #define AUTODETECT_VALUE 2
123 /* Debug hooks - dependent upon command line options. */
125 const struct gcc_debug_hooks
*debug_hooks
;
127 /* The FUNCTION_DECL for the function currently being compiled,
128 or 0 if between functions. */
129 tree current_function_decl
;
131 /* Set to the FUNC_BEGIN label of the current function, or NULL
133 const char * current_function_func_begin_label
;
135 /* A random sequence of characters, unless overridden by user. */
136 static const char *flag_random_seed
;
138 /* A local time stamp derived from the time of compilation. It will be
139 zero if the system cannot provide a time. It will be -1u, if the
140 user has specified a particular random seed. */
143 /* Random number for this compilation */
144 HOST_WIDE_INT random_seed
;
148 /* Nonzero means make permerror produce warnings instead of errors. */
150 int flag_permissive
= 0;
152 /* When non-NULL, indicates that whenever space is allocated on the
153 stack, the resulting stack pointer must not pass this
154 address---that is, for stacks that grow downward, the stack pointer
155 must always be greater than or equal to this address; for stacks
156 that grow upward, the stack pointer must be less than this address.
157 At present, the rtx may be either a REG or a SYMBOL_REF, although
158 the support provided depends on the backend. */
161 /* True if the user has tagged the function with the 'section'
164 bool user_defined_section_attribute
= false;
166 struct target_flag_state default_target_flag_state
;
167 #if SWITCHABLE_TARGET
168 struct target_flag_state
*this_target_flag_state
= &default_target_flag_state
;
170 #define this_target_flag_state (&default_target_flag_state)
173 /* The user symbol prefix after having resolved same. */
174 const char *user_label_prefix
;
176 /* Output files for assembler code (real compiler output)
177 and debugging dumps. */
181 FILE *stack_usage_file
= NULL
;
182 FILE *dump_file
= NULL
;
183 const char *dump_file_name
;
185 /* The current working directory of a translation. It's generally the
186 directory from which compilation was initiated, but a preprocessed
187 file may specify the original directory in which it was
190 static const char *src_pwd
;
192 /* Initialize src_pwd with the given string, and return true. If it
193 was already initialized, return false. As a special case, it may
194 be called with a NULL argument to test whether src_pwd has NOT been
198 set_src_pwd (const char *pwd
)
202 if (strcmp (src_pwd
, pwd
) == 0)
208 src_pwd
= xstrdup (pwd
);
212 /* Return the directory from which the translation unit was initiated,
213 in case set_src_pwd() was not called before to assign it a
229 /* Called when the start of a function definition is parsed,
230 this function prints on stderr the name of the function. */
232 announce_function (tree decl
)
236 if (rtl_dump_and_exit
)
237 fprintf (stderr
, "%s ",
238 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl
))));
240 fprintf (stderr
, " %s",
241 identifier_to_locale (lang_hooks
.decl_printable_name (decl
, 2)));
243 pp_needs_newline (global_dc
->printer
) = true;
244 diagnostic_set_last_function (global_dc
, (diagnostic_info
*) NULL
);
248 /* Initialize local_tick with a random number or -1 if
249 flag_random_seed is set. */
252 init_local_tick (void)
254 if (!flag_random_seed
)
256 /* Try urandom first. Time of day is too likely to collide.
257 In case of any error we just use the local tick. */
259 int fd
= open ("/dev/urandom", O_RDONLY
);
262 read (fd
, &random_seed
, sizeof (random_seed
));
266 /* Now get the tick anyways */
267 #ifdef HAVE_GETTIMEOFDAY
271 gettimeofday (&tv
, NULL
);
272 local_tick
= tv
.tv_sec
* 1000 + tv
.tv_usec
/ 1000;
276 time_t now
= time (NULL
);
278 if (now
!= (time_t)-1)
279 local_tick
= (unsigned) now
;
287 /* Set up a default flag_random_seed and local_tick, unless the user
288 already specified one. Must be called after init_local_tick. */
291 init_random_seed (void)
293 if (flag_random_seed
)
297 /* When the driver passed in a hex number don't crc it again */
298 random_seed
= strtoul (flag_random_seed
, &endp
, 0);
299 if (!(endp
> flag_random_seed
&& *endp
== 0))
300 random_seed
= crc32_string (0, flag_random_seed
);
302 else if (!random_seed
)
303 random_seed
= local_tick
^ getpid (); /* Old racey fallback method */
306 /* Obtain the random_seed. Unless NOINIT, initialize it if
307 it's not provided in the command line. */
310 get_random_seed (bool noinit
)
312 if (!flag_random_seed
&& !noinit
)
317 /* Modify the random_seed string to VAL. Return its previous
321 set_random_seed (const char *val
)
323 const char *old
= flag_random_seed
;
324 flag_random_seed
= val
;
328 /* Handler for fatal signals, such as SIGSEGV. These are transformed
329 into ICE messages, which is much more user friendly. In case the
330 error printer crashes, reset the signal to prevent infinite recursion. */
333 crash_signal (int signo
)
335 signal (signo
, SIG_DFL
);
337 /* If we crashed while processing an ASM statement, then be a little more
338 graceful. It's most likely the user's fault. */
339 if (this_is_asm_operands
)
341 output_operand_lossage ("unrecoverable error");
342 exit (FATAL_EXIT_CODE
);
345 internal_error ("%s", strsignal (signo
));
348 /* A subroutine of wrapup_global_declarations. We've come to the end of
349 the compilation unit. All deferred variables should be undeferred,
350 and all incomplete decls should be finalized. */
353 wrapup_global_declaration_1 (tree decl
)
355 /* We're not deferring this any longer. Assignment is conditional to
356 avoid needlessly dirtying PCH pages. */
357 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl
), TS_DECL_WITH_VIS
)
358 && DECL_DEFER_OUTPUT (decl
) != 0)
359 DECL_DEFER_OUTPUT (decl
) = 0;
361 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0)
362 lang_hooks
.finish_incomplete_decl (decl
);
365 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
366 needs to be output. Return true if it is output. */
369 wrapup_global_declaration_2 (tree decl
)
371 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
374 /* Don't write out static consts, unless we still need them.
376 We also keep static consts if not optimizing (for debugging),
377 unless the user specified -fno-keep-static-consts.
378 ??? They might be better written into the debug information.
379 This is possible when using DWARF.
381 A language processor that wants static constants to be always
382 written out (even if it is not used) is responsible for
383 calling rest_of_decl_compilation itself. E.g. the C front-end
384 calls rest_of_decl_compilation from finish_decl.
385 One motivation for this is that is conventional in some
386 environments to write things like:
387 static const char rcsid[] = "... version string ...";
388 intending to force the string to be in the executable.
390 A language processor that would prefer to have unneeded
391 static constants "optimized away" would just defer writing
392 them out until here. E.g. C++ does this, because static
393 constants are often defined in header files.
395 ??? A tempting alternative (for both C and C++) would be
396 to force a constant to be written if and only if it is
397 defined in a main file, as opposed to an include file. */
399 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
401 struct varpool_node
*node
;
403 node
= varpool_get_node (decl
);
405 if (!node
&& flag_ltrans
)
407 else if (node
&& node
->finalized
)
409 else if (node
&& node
->alias
)
411 else if (!cgraph_global_info_ready
413 || TREE_USED (DECL_ASSEMBLER_NAME (decl
))))
415 else if (node
&& node
->analyzed
)
417 else if (DECL_COMDAT (decl
))
419 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
420 && (optimize
|| !flag_keep_static_consts
421 || DECL_ARTIFICIAL (decl
)))
426 rest_of_decl_compilation (decl
, 1, 1);
434 /* Do any final processing required for the declarations in VEC, of
435 which there are LEN. We write out inline functions and variables
436 that have been deferred until this point, but which are required.
437 Returns nonzero if anything was put out. */
440 wrapup_global_declarations (tree
*vec
, int len
)
442 bool reconsider
, output_something
= false;
445 for (i
= 0; i
< len
; i
++)
446 wrapup_global_declaration_1 (vec
[i
]);
448 /* Now emit any global variables or functions that we have been
449 putting off. We need to loop in case one of the things emitted
450 here references another one which comes earlier in the list. */
454 for (i
= 0; i
< len
; i
++)
455 reconsider
|= wrapup_global_declaration_2 (vec
[i
]);
457 output_something
= true;
461 return output_something
;
464 /* A subroutine of check_global_declarations. Issue appropriate warnings
465 for the global declaration DECL. */
468 check_global_declaration_1 (tree decl
)
470 /* Warn about any function declared static but not defined. We don't
471 warn about variables, because many programs have static variables
472 that exist only to get some text into the object file. */
473 if (TREE_CODE (decl
) == FUNCTION_DECL
474 && DECL_INITIAL (decl
) == 0
475 && DECL_EXTERNAL (decl
)
476 && ! DECL_ARTIFICIAL (decl
)
477 && ! TREE_NO_WARNING (decl
)
478 && ! TREE_PUBLIC (decl
)
479 && (warn_unused_function
480 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
482 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
483 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
485 warning (OPT_Wunused_function
, "%q+F declared %<static%> but never defined", decl
);
486 /* This symbol is effectively an "extern" declaration now. */
487 TREE_PUBLIC (decl
) = 1;
490 /* Warn about static fns or vars defined but not used. */
491 if (((warn_unused_function
&& TREE_CODE (decl
) == FUNCTION_DECL
)
492 /* We don't warn about "static const" variables because the
493 "rcs_id" idiom uses that construction. */
494 || (warn_unused_variable
495 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
496 && ! DECL_IN_SYSTEM_HEADER (decl
)
497 && ! TREE_USED (decl
)
498 /* The TREE_USED bit for file-scope decls is kept in the identifier,
499 to handle multiple external decls in different scopes. */
500 && ! (DECL_NAME (decl
) && TREE_USED (DECL_NAME (decl
)))
501 && ! DECL_EXTERNAL (decl
)
502 && ! TREE_PUBLIC (decl
)
503 /* A volatile variable might be used in some non-obvious way. */
504 && ! TREE_THIS_VOLATILE (decl
)
505 /* Global register variables must be declared to reserve them. */
506 && ! (TREE_CODE (decl
) == VAR_DECL
&& DECL_REGISTER (decl
))
507 /* Otherwise, ask the language. */
508 && lang_hooks
.decls
.warn_unused_global (decl
))
509 warning ((TREE_CODE (decl
) == FUNCTION_DECL
)
510 ? OPT_Wunused_function
511 : OPT_Wunused_variable
,
512 "%q+D defined but not used", decl
);
515 /* Issue appropriate warnings for the global declarations in VEC (of
516 which there are LEN). */
519 check_global_declarations (tree
*vec
, int len
)
523 for (i
= 0; i
< len
; i
++)
524 check_global_declaration_1 (vec
[i
]);
527 /* Emit debugging information for all global declarations in VEC. */
530 emit_debug_global_declarations (tree
*vec
, int len
)
534 /* Avoid confusing the debug information machinery when there are errors. */
538 timevar_push (TV_SYMOUT
);
539 for (i
= 0; i
< len
; i
++)
540 debug_hooks
->global_decl (vec
[i
]);
541 timevar_pop (TV_SYMOUT
);
544 /* Compile an entire translation unit. Write a file of assembly
545 output and various debugging dumps. */
550 timevar_start (TV_PHASE_PARSING
);
551 timevar_push (TV_PARSE_GLOBAL
);
553 /* Call the parser, which parses the entire file (calling
554 rest_of_compilation for each function). */
555 lang_hooks
.parse_file ();
557 timevar_pop (TV_PARSE_GLOBAL
);
558 timevar_stop (TV_PHASE_PARSING
);
560 /* Compilation is now finished except for writing
561 what's left of the symbol table output. */
563 if (flag_syntax_only
|| flag_wpa
)
566 timevar_start (TV_PHASE_GENERATE
);
568 ggc_protect_identifiers
= false;
570 /* This must also call cgraph_finalize_compilation_unit. */
571 lang_hooks
.decls
.final_write_globals ();
575 timevar_stop (TV_PHASE_GENERATE
);
579 /* Compilation unit is finalized. When producing non-fat LTO object, we are
580 basically finished. */
581 if (in_lto_p
|| !flag_lto
|| flag_fat_lto_objects
)
583 varpool_remove_unreferenced_decls ();
584 varpool_assemble_pending_decls ();
587 /* Likewise for mudflap static object registrations. */
589 mudflap_finish_file ();
591 output_shared_constant_pool ();
592 output_object_blocks ();
593 finish_tm_clone_pairs ();
595 /* Write out any pending weak symbol declarations. */
598 /* This must be at the end before unwind and debug info.
599 Some target ports emit PIC setup thunks here. */
600 targetm
.asm_out
.code_end ();
602 /* Do dbx symbols. */
603 timevar_push (TV_SYMOUT
);
605 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
606 if (dwarf2out_do_frame ())
607 dwarf2out_frame_finish ();
610 (*debug_hooks
->finish
) (main_input_filename
);
611 timevar_pop (TV_SYMOUT
);
613 /* Output some stuff at end of file if nec. */
615 dw2_output_indirect_constants ();
617 /* Flush any pending external directives. */
618 process_pending_assemble_externals ();
621 /* Emit LTO marker if LTO info has been previously emitted. This is
622 used by collect2 to determine whether an object file contains IL.
623 We used to emit an undefined reference here, but this produces
624 link errors if an object file with IL is stored into a shared
625 library without invoking lto1. */
626 if (flag_generate_lto
)
628 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
629 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
,
631 (unsigned HOST_WIDE_INT
) 1, 8);
632 #elif defined ASM_OUTPUT_ALIGNED_COMMON
633 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_v1",
634 (unsigned HOST_WIDE_INT
) 1, 8);
636 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_v1",
637 (unsigned HOST_WIDE_INT
) 1,
638 (unsigned HOST_WIDE_INT
) 1);
640 /* Let linker plugin know that this is a slim object and must be LTOed
641 even when user did not ask for it. */
642 if (!flag_fat_lto_objects
)
644 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
645 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
,
647 (unsigned HOST_WIDE_INT
) 1, 8);
648 #elif defined ASM_OUTPUT_ALIGNED_COMMON
649 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_slim",
650 (unsigned HOST_WIDE_INT
) 1, 8);
652 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_slim",
653 (unsigned HOST_WIDE_INT
) 1,
654 (unsigned HOST_WIDE_INT
) 1);
659 /* Attach a special .ident directive to the end of the file to identify
660 the version of GCC which compiled this code. The format of the .ident
661 string is patterned after the ones produced by native SVR4 compilers. */
665 const char *pkg_version
= "(GNU) ";
667 if (strcmp ("(GCC) ", pkgversion_string
))
668 pkg_version
= pkgversion_string
;
669 fprintf (asm_out_file
, "%s\"GCC: %s%s\"\n",
670 IDENT_ASM_OP
, pkg_version
, version_string
);
674 /* Invoke registered plugin callbacks. */
675 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT
, NULL
);
677 /* This must be at the end. Some target ports emit end of file directives
678 into the assembly file here, and hence we can not output anything to the
679 assembly file after this point. */
680 targetm
.asm_out
.file_end ();
682 timevar_stop (TV_PHASE_GENERATE
);
685 /* Print version information to FILE.
686 Each line begins with INDENT (for the case where FILE is the
687 assembler output file). */
690 print_version (FILE *file
, const char *indent
)
692 static const char fmt1
[] =
694 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
696 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
699 static const char fmt2
[] =
700 N_("GMP version %s, MPFR version %s, MPC version %s\n");
701 static const char fmt3
[] =
702 N_("%s%swarning: %s header version %s differs from library version %s.\n");
703 static const char fmt4
[] =
704 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
706 #define __VERSION__ "[?]"
709 file
== stderr
? _(fmt1
) : fmt1
,
710 indent
, *indent
!= 0 ? " " : "",
711 lang_hooks
.name
, pkgversion_string
, version_string
, TARGET_NAME
,
712 indent
, __VERSION__
);
714 /* We need to stringify the GMP macro values. Ugh, gmp_version has
715 two string formats, "i.j.k" and "i.j" when k is zero. As of
716 gmp-4.3.0, GMP always uses the 3 number format. */
717 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
718 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3(X)
719 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
720 #define GCC_GMP_VERSION \
721 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
722 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
723 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
724 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR)
726 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
727 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) "." \
728 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_PATCHLEVEL)
731 file
== stderr
? _(fmt2
) : fmt2
,
732 GCC_GMP_STRINGIFY_VERSION
, MPFR_VERSION_STRING
, MPC_VERSION_STRING
);
733 if (strcmp (GCC_GMP_STRINGIFY_VERSION
, gmp_version
))
735 file
== stderr
? _(fmt3
) : fmt3
,
736 indent
, *indent
!= 0 ? " " : "",
737 "GMP", GCC_GMP_STRINGIFY_VERSION
, gmp_version
);
738 if (strcmp (MPFR_VERSION_STRING
, mpfr_get_version ()))
740 file
== stderr
? _(fmt3
) : fmt3
,
741 indent
, *indent
!= 0 ? " " : "",
742 "MPFR", MPFR_VERSION_STRING
, mpfr_get_version ());
743 if (strcmp (MPC_VERSION_STRING
, mpc_get_version ()))
745 file
== stderr
? _(fmt3
) : fmt3
,
746 indent
, *indent
!= 0 ? " " : "",
747 "MPC", MPC_VERSION_STRING
, mpc_get_version ());
749 file
== stderr
? _(fmt4
) : fmt4
,
750 indent
, *indent
!= 0 ? " " : "",
751 PARAM_VALUE (GGC_MIN_EXPAND
), PARAM_VALUE (GGC_MIN_HEAPSIZE
));
753 print_plugins_versions (file
, indent
);
757 print_to_asm_out_file (print_switch_type type
, const char * text
)
759 bool prepend_sep
= true;
763 case SWITCH_TYPE_LINE_END
:
764 putc ('\n', asm_out_file
);
767 case SWITCH_TYPE_LINE_START
:
768 fputs (ASM_COMMENT_START
, asm_out_file
);
769 return strlen (ASM_COMMENT_START
);
771 case SWITCH_TYPE_DESCRIPTIVE
:
772 if (ASM_COMMENT_START
[0] == 0)
775 case SWITCH_TYPE_PASSED
:
776 case SWITCH_TYPE_ENABLED
:
778 fputc (' ', asm_out_file
);
779 fputs (text
, asm_out_file
);
780 /* No need to return the length here as
781 print_single_switch has already done it. */
790 print_to_stderr (print_switch_type type
, const char * text
)
794 case SWITCH_TYPE_LINE_END
:
798 case SWITCH_TYPE_LINE_START
:
801 case SWITCH_TYPE_PASSED
:
802 case SWITCH_TYPE_ENABLED
:
806 case SWITCH_TYPE_DESCRIPTIVE
:
807 fputs (text
, stderr
);
808 /* No need to return the length here as
809 print_single_switch has already done it. */
817 /* Print an option value and return the adjusted position in the line.
818 ??? print_fn doesn't handle errors, eg disk full; presumably other
819 code will catch a disk full though. */
822 print_single_switch (print_switch_fn_type print_fn
,
824 print_switch_type type
,
827 /* The ultrix fprintf returns 0 on success, so compute the result
828 we want here since we need it for the following test. The +1
829 is for the separator character that will probably be emitted. */
830 int len
= strlen (text
) + 1;
833 && pos
+ len
> MAX_LINE
)
835 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
840 pos
+= print_fn (SWITCH_TYPE_LINE_START
, NULL
);
842 print_fn (type
, text
);
846 /* Print active target switches using PRINT_FN.
847 POS is the current cursor position and MAX is the size of a "line".
848 Each line begins with INDENT and ends with TERM.
849 Each switch is separated from the next by SEP. */
852 print_switch_values (print_switch_fn_type print_fn
)
857 /* Fill in the -frandom-seed option, if the user didn't pass it, so
858 that it can be printed below. This helps reproducibility. */
859 if (!flag_random_seed
)
862 /* Print the options as passed. */
863 pos
= print_single_switch (print_fn
, pos
,
864 SWITCH_TYPE_DESCRIPTIVE
, _("options passed: "));
866 for (j
= 1; j
< save_decoded_options_count
; j
++)
868 switch (save_decoded_options
[j
].opt_index
)
881 pos
= print_single_switch (print_fn
, pos
, SWITCH_TYPE_PASSED
,
882 save_decoded_options
[j
].orig_option_with_args_text
);
886 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
888 /* Print the -f and -m options that have been enabled.
889 We don't handle language specific options but printing argv
891 pos
= print_single_switch (print_fn
, 0,
892 SWITCH_TYPE_DESCRIPTIVE
, _("options enabled: "));
894 for (j
= 0; j
< cl_options_count
; j
++)
895 if (cl_options
[j
].cl_report
896 && option_enabled (j
, &global_options
) > 0)
897 pos
= print_single_switch (print_fn
, pos
,
898 SWITCH_TYPE_ENABLED
, cl_options
[j
].opt_text
);
900 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
903 /* Open assembly code output file. Do this even if -fsyntax-only is
904 on, because then the driver will have provided the name of a
905 temporary file or bit bucket for us. NAME is the file specified on
906 the command line, possibly NULL. */
908 init_asm_output (const char *name
)
910 if (name
== NULL
&& asm_file_name
== 0)
911 asm_out_file
= stdout
;
914 if (asm_file_name
== 0)
916 int len
= strlen (dump_base_name
);
917 char *dumpname
= XNEWVEC (char, len
+ 6);
919 memcpy (dumpname
, dump_base_name
, len
+ 1);
920 strip_off_ending (dumpname
, len
);
921 strcat (dumpname
, ".s");
922 asm_file_name
= dumpname
;
924 if (!strcmp (asm_file_name
, "-"))
925 asm_out_file
= stdout
;
927 asm_out_file
= fopen (asm_file_name
, "w+b");
928 if (asm_out_file
== 0)
929 fatal_error ("can%'t open %s for writing: %m", asm_file_name
);
932 if (!flag_syntax_only
)
934 targetm
.asm_out
.file_start ();
936 if (flag_record_gcc_switches
)
938 if (targetm
.asm_out
.record_gcc_switches
)
940 /* Let the target know that we are about to start recording. */
941 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
943 /* Now record the switches. */
944 print_switch_values (targetm
.asm_out
.record_gcc_switches
);
945 /* Let the target know that the recording is over. */
946 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
950 inform (input_location
, "-frecord-gcc-switches is not supported by the current target");
953 if (flag_verbose_asm
)
955 /* Print the list of switches in effect
956 into the assembler file as comments. */
957 print_version (asm_out_file
, ASM_COMMENT_START
);
958 print_switch_values (print_to_asm_out_file
);
959 putc ('\n', asm_out_file
);
964 /* A helper function; used as the reallocator function for cpp's line
967 realloc_for_line_map (void *ptr
, size_t len
)
969 return GGC_RESIZEVAR (void, ptr
, len
);
972 /* A helper function: used as the allocator function for
973 identifier_to_locale. */
975 alloc_for_identifier_to_locale (size_t len
)
977 return ggc_alloc_atomic (len
);
980 /* Output stack usage information. */
982 output_stack_usage (void)
984 static bool warning_issued
= false;
985 enum stack_usage_kind_type
{ STATIC
= 0, DYNAMIC
, DYNAMIC_BOUNDED
};
986 const char *stack_usage_kind_str
[] = {
991 HOST_WIDE_INT stack_usage
= current_function_static_stack_size
;
992 enum stack_usage_kind_type stack_usage_kind
;
998 warning (0, "stack usage computation not supported for this target");
999 warning_issued
= true;
1004 stack_usage_kind
= STATIC
;
1006 /* Add the maximum amount of space pushed onto the stack. */
1007 if (current_function_pushed_stack_size
> 0)
1009 stack_usage
+= current_function_pushed_stack_size
;
1010 stack_usage_kind
= DYNAMIC_BOUNDED
;
1013 /* Now on to the tricky part: dynamic stack allocation. */
1014 if (current_function_allocates_dynamic_stack_space
)
1016 if (current_function_has_unbounded_dynamic_stack_size
)
1017 stack_usage_kind
= DYNAMIC
;
1019 stack_usage_kind
= DYNAMIC_BOUNDED
;
1021 /* Add the size even in the unbounded case, this can't hurt. */
1022 stack_usage
+= current_function_dynamic_stack_size
;
1025 if (flag_stack_usage
)
1027 expanded_location loc
1028 = expand_location (DECL_SOURCE_LOCATION (current_function_decl
));
1029 const char *raw_id
, *id
;
1031 /* Strip the scope prefix if any. */
1032 raw_id
= lang_hooks
.decl_printable_name (current_function_decl
, 2);
1033 id
= strrchr (raw_id
, '.');
1039 fprintf (stack_usage_file
,
1040 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC
"\t%s\n",
1041 lbasename (loc
.file
),
1046 stack_usage_kind_str
[stack_usage_kind
]);
1049 if (warn_stack_usage
>= 0)
1051 if (stack_usage_kind
== DYNAMIC
)
1052 warning (OPT_Wstack_usage_
, "stack usage might be unbounded");
1053 else if (stack_usage
> warn_stack_usage
)
1055 if (stack_usage_kind
== DYNAMIC_BOUNDED
)
1056 warning (OPT_Wstack_usage_
, "stack usage might be %wd bytes",
1059 warning (OPT_Wstack_usage_
, "stack usage is %wd bytes",
1065 /* Open an auxiliary output file. */
1067 open_auxiliary_file (const char *ext
)
1072 filename
= concat (aux_base_name
, ".", ext
, NULL
);
1073 file
= fopen (filename
, "w");
1075 fatal_error ("can%'t open %s for writing: %m", filename
);
1080 /* Initialization of the front end environment, before command line
1081 options are parsed. Signal handlers, internationalization etc.
1082 ARGV0 is main's argv[0]. */
1084 general_init (const char *argv0
)
1088 p
= argv0
+ strlen (argv0
);
1089 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
1093 xmalloc_set_program_name (progname
);
1097 /* Unlock the stdio streams. */
1098 unlock_std_streams ();
1100 gcc_init_libintl ();
1102 identifier_to_locale_alloc
= alloc_for_identifier_to_locale
;
1103 identifier_to_locale_free
= ggc_free
;
1105 /* Initialize the diagnostics reporting machinery, so option parsing
1106 can give warnings and errors. */
1107 diagnostic_initialize (global_dc
, N_OPTS
);
1108 /* Set a default printer. Language specific initializations will
1109 override it later. */
1110 tree_diagnostics_defaults (global_dc
);
1111 /* FIXME: This should probably be moved to C-family
1112 language-specific initializations. */
1113 /* By default print macro expansion contexts in the diagnostic
1114 finalizer -- for tokens resulting from macro expansion. */
1115 diagnostic_finalizer (global_dc
) = virt_loc_aware_diagnostic_finalizer
;
1117 global_dc
->show_caret
1118 = global_options_init
.x_flag_diagnostics_show_caret
;
1119 global_dc
->show_option_requested
1120 = global_options_init
.x_flag_diagnostics_show_option
;
1121 global_dc
->show_column
1122 = global_options_init
.x_flag_show_column
;
1123 global_dc
->internal_error
= plugins_internal_error_function
;
1124 global_dc
->option_enabled
= option_enabled
;
1125 global_dc
->option_state
= &global_options
;
1126 global_dc
->option_name
= option_name
;
1128 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1130 signal (SIGSEGV
, crash_signal
);
1133 signal (SIGILL
, crash_signal
);
1136 signal (SIGBUS
, crash_signal
);
1139 signal (SIGABRT
, crash_signal
);
1141 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1142 signal (SIGIOT
, crash_signal
);
1145 signal (SIGFPE
, crash_signal
);
1148 /* Other host-specific signal setup. */
1149 (*host_hooks
.extra_signals
)();
1151 /* Initialize the garbage-collector, string pools and tree type hash
1155 line_table
= ggc_alloc_line_maps ();
1156 linemap_init (line_table
);
1157 line_table
->reallocator
= realloc_for_line_map
;
1158 line_table
->round_alloc_size
= ggc_round_alloc_size
;
1161 /* Initialize register usage now so switches may override. */
1164 /* Register the language-independent parameters. */
1165 global_init_params ();
1167 /* This must be done after global_init_params but before argument
1169 init_ggc_heuristics();
1170 init_optimization_passes ();
1171 statistics_early_init ();
1175 /* Return true if the current target supports -fsection-anchors. */
1178 target_supports_section_anchors_p (void)
1180 if (targetm
.min_anchor_offset
== 0 && targetm
.max_anchor_offset
== 0)
1183 if (targetm
.asm_out
.output_anchor
== NULL
)
1189 /* Default the align_* variables to 1 if they're still unset, and
1190 set up the align_*_log variables. */
1192 init_alignments (void)
1194 if (align_loops
<= 0)
1196 if (align_loops_max_skip
> align_loops
)
1197 align_loops_max_skip
= align_loops
- 1;
1198 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
1199 if (align_jumps
<= 0)
1201 if (align_jumps_max_skip
> align_jumps
)
1202 align_jumps_max_skip
= align_jumps
- 1;
1203 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
1204 if (align_labels
<= 0)
1206 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
1207 if (align_labels_max_skip
> align_labels
)
1208 align_labels_max_skip
= align_labels
- 1;
1209 if (align_functions
<= 0)
1210 align_functions
= 1;
1211 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
1214 /* Process the options that have been parsed. */
1216 process_options (void)
1218 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1219 This can happen with incorrect pre-processed input. */
1220 debug_hooks
= &do_nothing_debug_hooks
;
1222 maximum_field_alignment
= initial_max_fld_align
* BITS_PER_UNIT
;
1224 /* Allow the front end to perform consistency checks and do further
1225 initialization based on the command line options. This hook also
1226 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1227 so we can correctly initialize debug output. */
1228 no_backend
= lang_hooks
.post_options (&main_input_filename
);
1230 /* Some machines may reject certain combinations of options. */
1231 targetm
.target_option
.override ();
1233 /* Avoid any informative notes in the second run of -fcompare-debug. */
1234 if (flag_compare_debug
)
1235 diagnostic_inhibit_notes (global_dc
);
1237 if (flag_section_anchors
&& !target_supports_section_anchors_p ())
1239 warning (OPT_fsection_anchors
,
1240 "this target does not support %qs", "-fsection-anchors");
1241 flag_section_anchors
= 0;
1244 if (flag_short_enums
== 2)
1245 flag_short_enums
= targetm
.default_short_enums ();
1247 /* Set aux_base_name if not already set. */
1250 else if (main_input_filename
)
1252 char *name
= xstrdup (lbasename (main_input_filename
));
1254 strip_off_ending (name
, strlen (name
));
1255 aux_base_name
= name
;
1258 aux_base_name
= "gccaux";
1262 || flag_graphite_identity
1264 || flag_loop_interchange
1265 || flag_loop_strip_mine
1266 || flag_loop_parallelize_all
)
1267 sorry ("Graphite loop optimizations cannot be used (-fgraphite, "
1268 "-fgraphite-identity, -floop-block, "
1269 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1270 "and -ftree-loop-linear)");
1273 if (flag_mudflap
&& flag_lto
)
1274 sorry ("mudflap cannot be used together with link-time optimization");
1276 /* One region RA really helps to decrease the code size. */
1277 if (flag_ira_region
== IRA_REGION_AUTODETECT
)
1279 = optimize_size
|| !optimize
? IRA_REGION_ONE
: IRA_REGION_MIXED
;
1281 if (flag_strict_volatile_bitfields
> 0 && !abi_version_at_least (2))
1283 warning (0, "-fstrict-volatile-bitfields disabled; "
1284 "it is incompatible with ABI versions < 2");
1285 flag_strict_volatile_bitfields
= 0;
1288 /* Unrolling all loops implies that standard loop unrolling must also
1290 if (flag_unroll_all_loops
)
1291 flag_unroll_loops
= 1;
1293 /* web and rename-registers help when run after loop unrolling. */
1294 if (flag_web
== AUTODETECT_VALUE
)
1295 flag_web
= flag_unroll_loops
|| flag_peel_loops
;
1297 if (flag_rename_registers
== AUTODETECT_VALUE
)
1298 flag_rename_registers
= flag_unroll_loops
|| flag_peel_loops
;
1300 if (flag_non_call_exceptions
)
1301 flag_asynchronous_unwind_tables
= 1;
1302 if (flag_asynchronous_unwind_tables
)
1303 flag_unwind_tables
= 1;
1305 if (flag_value_profile_transformations
)
1306 flag_profile_values
= 1;
1308 /* Warn about options that are not supported on this machine. */
1309 #ifndef INSN_SCHEDULING
1310 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
1311 warning (0, "instruction scheduling not supported on this target machine");
1314 if (flag_delayed_branch
)
1315 warning (0, "this target machine does not have delayed branches");
1318 user_label_prefix
= USER_LABEL_PREFIX
;
1319 if (flag_leading_underscore
!= -1)
1321 /* If the default prefix is more complicated than "" or "_",
1322 issue a warning and ignore this option. */
1323 if (user_label_prefix
[0] == 0 ||
1324 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
1326 user_label_prefix
= flag_leading_underscore
? "_" : "";
1329 warning (0, "-f%sleading-underscore not supported on this target machine",
1330 flag_leading_underscore
? "" : "no-");
1333 /* If we are in verbose mode, write out the version and maybe all the
1334 option flags in use. */
1337 print_version (stderr
, "");
1339 print_switch_values (print_to_stderr
);
1342 if (flag_syntax_only
)
1344 write_symbols
= NO_DEBUG
;
1350 if (debug_info_level
== DINFO_LEVEL_NONE
)
1352 debug_info_level
= DINFO_LEVEL_NORMAL
;
1354 if (write_symbols
== NO_DEBUG
)
1355 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
1358 debug_info_level
= DINFO_LEVEL_NONE
;
1361 if (flag_dump_final_insns
&& !flag_syntax_only
&& !no_backend
)
1363 FILE *final_output
= fopen (flag_dump_final_insns
, "w");
1366 error ("could not open final insn dump file %qs: %m",
1367 flag_dump_final_insns
);
1368 flag_dump_final_insns
= NULL
;
1370 else if (fclose (final_output
))
1372 error ("could not close zeroed insn dump file %qs: %m",
1373 flag_dump_final_insns
);
1374 flag_dump_final_insns
= NULL
;
1378 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1380 if (debug_info_level
== DINFO_LEVEL_NONE
)
1381 write_symbols
= NO_DEBUG
;
1383 if (write_symbols
== NO_DEBUG
)
1385 #if defined(DBX_DEBUGGING_INFO)
1386 else if (write_symbols
== DBX_DEBUG
)
1387 debug_hooks
= &dbx_debug_hooks
;
1389 #if defined(XCOFF_DEBUGGING_INFO)
1390 else if (write_symbols
== XCOFF_DEBUG
)
1391 debug_hooks
= &xcoff_debug_hooks
;
1393 #ifdef SDB_DEBUGGING_INFO
1394 else if (write_symbols
== SDB_DEBUG
)
1395 debug_hooks
= &sdb_debug_hooks
;
1397 #ifdef DWARF2_DEBUGGING_INFO
1398 else if (write_symbols
== DWARF2_DEBUG
)
1399 debug_hooks
= &dwarf2_debug_hooks
;
1401 #ifdef VMS_DEBUGGING_INFO
1402 else if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1403 debug_hooks
= &vmsdbg_debug_hooks
;
1406 error ("target system does not support the \"%s\" debug format",
1407 debug_type_names
[write_symbols
]);
1409 /* We know which debug output will be used so we can set flag_var_tracking
1410 and flag_var_tracking_uninit if the user has not specified them. */
1411 if (debug_info_level
< DINFO_LEVEL_NORMAL
1412 || debug_hooks
->var_location
== do_nothing_debug_hooks
.var_location
)
1414 if (flag_var_tracking
== 1
1415 || flag_var_tracking_uninit
== 1)
1417 if (debug_info_level
< DINFO_LEVEL_NORMAL
)
1418 warning (0, "variable tracking requested, but useless unless "
1419 "producing debug info");
1421 warning (0, "variable tracking requested, but not supported "
1422 "by this debug format");
1424 flag_var_tracking
= 0;
1425 flag_var_tracking_uninit
= 0;
1428 /* The debug hooks are used to implement -fdump-go-spec because it
1429 gives a simple and stable API for all the information we need to
1431 if (flag_dump_go_spec
!= NULL
)
1432 debug_hooks
= dump_go_spec_init (flag_dump_go_spec
, debug_hooks
);
1434 /* If the user specifically requested variable tracking with tagging
1435 uninitialized variables, we need to turn on variable tracking.
1436 (We already determined above that variable tracking is feasible.) */
1437 if (flag_var_tracking_uninit
)
1438 flag_var_tracking
= 1;
1440 if (flag_var_tracking
== AUTODETECT_VALUE
)
1441 flag_var_tracking
= optimize
>= 1;
1443 if (flag_var_tracking_assignments
== AUTODETECT_VALUE
)
1444 flag_var_tracking_assignments
= flag_var_tracking
1445 && !(flag_selective_scheduling
|| flag_selective_scheduling2
);
1447 if (flag_var_tracking_assignments_toggle
)
1448 flag_var_tracking_assignments
= !flag_var_tracking_assignments
;
1450 if (flag_var_tracking_assignments
&& !flag_var_tracking
)
1451 flag_var_tracking
= flag_var_tracking_assignments
= -1;
1453 if (flag_var_tracking_assignments
1454 && (flag_selective_scheduling
|| flag_selective_scheduling2
))
1455 warning (0, "var-tracking-assignments changes selective scheduling");
1457 if (flag_tree_cselim
== AUTODETECT_VALUE
)
1458 #ifdef HAVE_conditional_move
1459 flag_tree_cselim
= 1;
1461 flag_tree_cselim
= 0;
1464 /* If auxiliary info generation is desired, open the output file.
1465 This goes in the same directory as the source file--unlike
1466 all the other output files. */
1467 if (flag_gen_aux_info
)
1469 aux_info_file
= fopen (aux_info_file_name
, "w");
1470 if (aux_info_file
== 0)
1471 fatal_error ("can%'t open %s: %m", aux_info_file_name
);
1474 if (!targetm_common
.have_named_sections
)
1476 if (flag_function_sections
)
1478 warning (0, "-ffunction-sections not supported for this target");
1479 flag_function_sections
= 0;
1481 if (flag_data_sections
)
1483 warning (0, "-fdata-sections not supported for this target");
1484 flag_data_sections
= 0;
1488 if (flag_function_sections
&& profile_flag
)
1490 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
1491 flag_function_sections
= 0;
1494 #ifndef HAVE_prefetch
1495 if (flag_prefetch_loop_arrays
> 0)
1497 warning (0, "-fprefetch-loop-arrays not supported for this target");
1498 flag_prefetch_loop_arrays
= 0;
1501 if (flag_prefetch_loop_arrays
> 0 && !HAVE_prefetch
)
1503 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1504 flag_prefetch_loop_arrays
= 0;
1508 /* This combination of options isn't handled for i386 targets and doesn't
1509 make much sense anyway, so don't allow it. */
1510 if (flag_prefetch_loop_arrays
> 0 && optimize_size
)
1512 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1513 flag_prefetch_loop_arrays
= 0;
1516 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1517 if (flag_signaling_nans
)
1518 flag_trapping_math
= 1;
1520 /* We cannot reassociate if we want traps or signed zeros. */
1521 if (flag_associative_math
&& (flag_trapping_math
|| flag_signed_zeros
))
1523 warning (0, "-fassociative-math disabled; other options take precedence");
1524 flag_associative_math
= 0;
1527 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1528 if (flag_cx_limited_range
)
1529 flag_complex_method
= 0;
1531 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1532 if (flag_cx_fortran_rules
)
1533 flag_complex_method
= 1;
1535 /* Targets must be able to place spill slots at lower addresses. If the
1536 target already uses a soft frame pointer, the transition is trivial. */
1537 if (!FRAME_GROWS_DOWNWARD
&& flag_stack_protect
)
1539 warning (0, "-fstack-protector not supported for this target");
1540 flag_stack_protect
= 0;
1542 if (!flag_stack_protect
)
1543 warn_stack_protect
= 0;
1545 /* ??? Unwind info is not correct around the CFG unless either a frame
1546 pointer is present or A_O_A is set. Fixing this requires rewriting
1547 unwind info generation to be aware of the CFG and propagating states
1549 if (flag_unwind_tables
&& !ACCUMULATE_OUTGOING_ARGS
1550 && flag_omit_frame_pointer
)
1552 warning (0, "unwind tables currently require a frame pointer "
1554 flag_omit_frame_pointer
= 0;
1557 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1558 have not been set. */
1559 if (!global_options_set
.x_warnings_are_errors
1560 && warn_coverage_mismatch
1561 && (global_dc
->classify_diagnostic
[OPT_Wcoverage_mismatch
] ==
1563 diagnostic_classify_diagnostic (global_dc
, OPT_Wcoverage_mismatch
,
1564 DK_ERROR
, UNKNOWN_LOCATION
);
1566 /* Save the current optimization options. */
1567 optimization_default_node
= build_optimization_node ();
1568 optimization_current_node
= optimization_default_node
;
1571 /* This function can be called multiple times to reinitialize the compiler
1572 back end when register classes or instruction sets have changed,
1573 before each function. */
1575 backend_init_target (void)
1577 /* Initialize alignment variables. */
1580 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
1581 to initialize reg_raw_mode[]. */
1584 /* This invokes target hooks to set fixed_reg[] etc, which is
1588 /* This depends on stack_pointer_rtx. */
1589 init_fake_stack_mems ();
1591 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1593 init_alias_target ();
1595 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1598 /* The following initialization functions need to generate rtl, so
1599 provide a dummy function context for them. */
1600 init_dummy_function_start ();
1602 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1603 on a mode change. */
1606 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1607 after a mode change as well. */
1608 caller_save_initialized_p
= false;
1610 expand_dummy_function_end ();
1613 /* Initialize the compiler back end. This function is called only once,
1614 when starting the compiler. */
1621 init_inline_once ();
1622 init_varasm_once ();
1623 save_register_info ();
1625 /* Initialize the target-specific back end pieces. */
1627 backend_init_target ();
1630 /* Initialize excess precision settings. */
1632 init_excess_precision (void)
1634 /* Adjust excess precision handling based on the target options. If
1635 the front end cannot handle it, flag_excess_precision_cmdline
1636 will already have been set accordingly in the post_options
1638 gcc_assert (flag_excess_precision_cmdline
!= EXCESS_PRECISION_DEFAULT
);
1639 flag_excess_precision
= flag_excess_precision_cmdline
;
1640 if (flag_unsafe_math_optimizations
)
1641 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1642 if (flag_excess_precision
== EXCESS_PRECISION_STANDARD
)
1644 int flt_eval_method
= TARGET_FLT_EVAL_METHOD
;
1645 switch (flt_eval_method
)
1649 /* Either the target acts unpredictably (-1) or has all the
1650 operations required not to have excess precision (0). */
1651 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1655 /* In these cases, predictable excess precision makes
1659 /* Any other implementation-defined FLT_EVAL_METHOD values
1660 require the compiler to handle the associated excess
1661 precision rules in excess_precision_type. */
1667 /* Initialize things that are both lang-dependent and target-dependent.
1668 This function can be called more than once if target parameters change. */
1670 lang_dependent_init_target (void)
1672 /* This determines excess precision settings. */
1673 init_excess_precision ();
1675 /* This creates various _DECL nodes, so needs to be called after the
1676 front end is initialized. It also depends on the HAVE_xxx macros
1677 generated from the target machine description. */
1680 /* The following initialization functions need to generate rtl, so
1681 provide a dummy function context for them. */
1682 init_dummy_function_start ();
1684 /* Do the target-specific parts of expr initialization. */
1685 init_expr_target ();
1687 /* Although the actions of these functions are language-independent,
1688 they use optabs, so we cannot call them from backend_init. */
1692 expand_dummy_function_end ();
1695 /* Language-dependent initialization. Returns nonzero on success. */
1697 lang_dependent_init (const char *name
)
1699 location_t save_loc
= input_location
;
1700 if (dump_base_name
== 0)
1701 dump_base_name
= name
&& name
[0] ? name
: "gccdump";
1703 /* Other front-end initialization. */
1704 input_location
= BUILTINS_LOCATION
;
1705 if (lang_hooks
.init () == 0)
1707 input_location
= save_loc
;
1711 init_asm_output (name
);
1713 /* If stack usage information is desired, open the output file. */
1714 if (flag_stack_usage
)
1715 stack_usage_file
= open_auxiliary_file ("su");
1718 /* This creates various _DECL nodes, so needs to be called after the
1719 front end is initialized. */
1722 /* Do the target-specific parts of the initialization. */
1723 lang_dependent_init_target ();
1727 /* If dbx symbol table desired, initialize writing it and output the
1728 predefined types. */
1729 timevar_push (TV_SYMOUT
);
1731 /* Now we have the correct original filename, we can initialize
1733 (*debug_hooks
->init
) (name
);
1735 timevar_pop (TV_SYMOUT
);
1742 /* Reinitialize everything when target parameters, such as register usage,
1745 target_reinit (void)
1747 struct rtl_data saved_x_rtl
;
1748 rtx
*saved_regno_reg_rtx
;
1750 /* Save *crtl and regno_reg_rtx around the reinitialization
1751 to allow target_reinit being called even after prepare_function_start. */
1752 saved_regno_reg_rtx
= regno_reg_rtx
;
1753 if (saved_regno_reg_rtx
)
1755 saved_x_rtl
= *crtl
;
1756 memset (crtl
, '\0', sizeof (*crtl
));
1757 regno_reg_rtx
= NULL
;
1760 /* Reinitialize RTL backend. */
1761 backend_init_target ();
1763 /* Reinitialize lang-dependent parts. */
1764 lang_dependent_init_target ();
1766 /* And restore it at the end, as free_after_compilation from
1767 expand_dummy_function_end clears it. */
1768 if (saved_regno_reg_rtx
)
1770 *crtl
= saved_x_rtl
;
1771 regno_reg_rtx
= saved_regno_reg_rtx
;
1772 saved_regno_reg_rtx
= NULL
;
1777 dump_memory_report (bool final
)
1779 dump_line_table_statistics ();
1780 ggc_print_statistics ();
1781 stringpool_statistics ();
1782 dump_tree_statistics ();
1783 dump_gimple_statistics ();
1784 dump_rtx_statistics ();
1785 dump_alloc_pool_statistics ();
1786 dump_bitmap_statistics ();
1787 dump_vec_loc_statistics ();
1788 dump_ggc_loc_statistics (final
);
1789 dump_alias_stats (stderr
);
1790 dump_pta_stats (stderr
);
1793 /* Clean up: close opened files, etc. */
1796 finalize (bool no_backend
)
1798 /* Close the dump files. */
1799 if (flag_gen_aux_info
)
1801 fclose (aux_info_file
);
1803 unlink (aux_info_file_name
);
1806 /* Close non-debugging input and output files. Take special care to note
1807 whether fclose returns an error, since the pages might still be on the
1808 buffer chain while the file is open. */
1812 if (ferror (asm_out_file
) != 0)
1813 fatal_error ("error writing to %s: %m", asm_file_name
);
1814 if (fclose (asm_out_file
) != 0)
1815 fatal_error ("error closing %s: %m", asm_file_name
);
1818 if (stack_usage_file
)
1819 fclose (stack_usage_file
);
1825 finish_optimization_passes ();
1831 dump_memory_report (true);
1833 /* Language-specific end of compilation actions. */
1834 lang_hooks
.finish ();
1837 /* Initialize the compiler, and compile the input file. */
1841 /* Initialize timing first. The C front ends read the main file in
1842 the post_options hook, and C++ does file timings. */
1843 if (time_report
|| !quiet_flag
|| flag_detailed_statistics
)
1845 timevar_start (TV_TOTAL
);
1849 /* Don't do any more if an error has already occurred. */
1852 timevar_start (TV_PHASE_SETUP
);
1854 /* This must be run always, because it is needed to compute the FP
1855 predefined macros, such as __LDBL_MAX__, for targets using non
1856 default FP formats. */
1857 init_adjust_machine_modes ();
1859 /* Set up the back-end if requested. */
1863 /* Language-dependent initialization. Returns true on success. */
1864 if (lang_dependent_init (main_input_filename
))
1866 /* Initialize yet another pass. */
1868 ggc_protect_identifiers
= true;
1871 init_final (main_input_filename
);
1872 coverage_init (aux_base_name
);
1874 invoke_plugin_callbacks (PLUGIN_START_UNIT
, NULL
);
1876 timevar_stop (TV_PHASE_SETUP
);
1882 timevar_stop (TV_PHASE_SETUP
);
1885 timevar_start (TV_PHASE_FINALIZE
);
1887 finalize (no_backend
);
1889 timevar_stop (TV_PHASE_FINALIZE
);
1892 /* Stop timing and print the times. */
1893 timevar_stop (TV_TOTAL
);
1894 timevar_print (stderr
);
1897 /* Entry point of cc1, cc1plus, jc1, f771, etc.
1898 Exit code is FATAL_EXIT_CODE if can't open files or if there were
1899 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
1901 It is not safe to call this function more than once. */
1904 toplev_main (int argc
, char **argv
)
1906 /* Parsing and gimplification sometimes need quite large stack.
1907 Increase stack size limits if possible. */
1908 stack_limit_increase (64 * 1024 * 1024);
1910 expandargv (&argc
, &argv
);
1912 /* Initialization of GCC's environment, and diagnostics. */
1913 general_init (argv
[0]);
1915 /* One-off initialization of options that does not need to be
1916 repeated when options are added for particular functions. */
1917 init_options_once ();
1919 /* Initialize global options structures; this must be repeated for
1920 each structure used for parsing options. */
1921 init_options_struct (&global_options
, &global_options_set
);
1922 lang_hooks
.init_options_struct (&global_options
);
1924 /* Convert the options to an array. */
1925 decode_cmdline_options_to_array_default_mask (argc
,
1926 CONST_CAST2 (const char **,
1928 &save_decoded_options
,
1929 &save_decoded_options_count
);
1931 /* Perform language-specific options initialization. */
1932 lang_hooks
.init_options (save_decoded_options_count
, save_decoded_options
);
1934 /* Parse the options and do minimal processing; basically just
1935 enough to default flags appropriately. */
1936 decode_options (&global_options
, &global_options_set
,
1937 save_decoded_options
, save_decoded_options_count
,
1938 UNKNOWN_LOCATION
, global_dc
);
1940 handle_common_deferred_options ();
1944 initialize_plugins ();
1947 print_version (stderr
, "");
1950 print_plugins_help (stderr
, "");
1952 /* Exit early if we can (e.g. -help). */
1953 if (!exit_after_options
)
1956 if (warningcount
|| errorcount
)
1957 print_ignored_options ();
1958 diagnostic_finish (global_dc
);
1960 /* Invoke registered plugin callbacks if any. */
1961 invoke_plugin_callbacks (PLUGIN_FINISH
, NULL
);
1963 finalize_plugins ();
1965 return (FATAL_EXIT_CODE
);
1967 return (SUCCESS_EXIT_CODE
);