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 /* When non-NULL, indicates that whenever space is allocated on the
149 stack, the resulting stack pointer must not pass this
150 address---that is, for stacks that grow downward, the stack pointer
151 must always be greater than or equal to this address; for stacks
152 that grow upward, the stack pointer must be less than this address.
153 At present, the rtx may be either a REG or a SYMBOL_REF, although
154 the support provided depends on the backend. */
157 /* True if the user has tagged the function with the 'section'
160 bool user_defined_section_attribute
= false;
162 struct target_flag_state default_target_flag_state
;
163 #if SWITCHABLE_TARGET
164 struct target_flag_state
*this_target_flag_state
= &default_target_flag_state
;
166 #define this_target_flag_state (&default_target_flag_state)
169 /* The user symbol prefix after having resolved same. */
170 const char *user_label_prefix
;
172 /* Output files for assembler code (real compiler output)
173 and debugging dumps. */
177 FILE *stack_usage_file
= NULL
;
178 FILE *dump_file
= NULL
;
179 const char *dump_file_name
;
181 /* The current working directory of a translation. It's generally the
182 directory from which compilation was initiated, but a preprocessed
183 file may specify the original directory in which it was
186 static const char *src_pwd
;
188 /* Initialize src_pwd with the given string, and return true. If it
189 was already initialized, return false. As a special case, it may
190 be called with a NULL argument to test whether src_pwd has NOT been
194 set_src_pwd (const char *pwd
)
198 if (strcmp (src_pwd
, pwd
) == 0)
204 src_pwd
= xstrdup (pwd
);
208 /* Return the directory from which the translation unit was initiated,
209 in case set_src_pwd() was not called before to assign it a
225 /* Called when the start of a function definition is parsed,
226 this function prints on stderr the name of the function. */
228 announce_function (tree decl
)
232 if (rtl_dump_and_exit
)
233 fprintf (stderr
, "%s ",
234 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl
))));
236 fprintf (stderr
, " %s",
237 identifier_to_locale (lang_hooks
.decl_printable_name (decl
, 2)));
239 pp_needs_newline (global_dc
->printer
) = true;
240 diagnostic_set_last_function (global_dc
, (diagnostic_info
*) NULL
);
244 /* Initialize local_tick with a random number or -1 if
245 flag_random_seed is set. */
248 init_local_tick (void)
250 if (!flag_random_seed
)
252 /* Try urandom first. Time of day is too likely to collide.
253 In case of any error we just use the local tick. */
255 int fd
= open ("/dev/urandom", O_RDONLY
);
258 read (fd
, &random_seed
, sizeof (random_seed
));
262 /* Now get the tick anyways */
263 #ifdef HAVE_GETTIMEOFDAY
267 gettimeofday (&tv
, NULL
);
268 local_tick
= tv
.tv_sec
* 1000 + tv
.tv_usec
/ 1000;
272 time_t now
= time (NULL
);
274 if (now
!= (time_t)-1)
275 local_tick
= (unsigned) now
;
283 /* Set up a default flag_random_seed and local_tick, unless the user
284 already specified one. Must be called after init_local_tick. */
287 init_random_seed (void)
289 if (flag_random_seed
)
293 /* When the driver passed in a hex number don't crc it again */
294 random_seed
= strtoul (flag_random_seed
, &endp
, 0);
295 if (!(endp
> flag_random_seed
&& *endp
== 0))
296 random_seed
= crc32_string (0, flag_random_seed
);
298 else if (!random_seed
)
299 random_seed
= local_tick
^ getpid (); /* Old racey fallback method */
302 /* Obtain the random_seed. Unless NOINIT, initialize it if
303 it's not provided in the command line. */
306 get_random_seed (bool noinit
)
308 if (!flag_random_seed
&& !noinit
)
313 /* Modify the random_seed string to VAL. Return its previous
317 set_random_seed (const char *val
)
319 const char *old
= flag_random_seed
;
320 flag_random_seed
= val
;
324 /* Handler for fatal signals, such as SIGSEGV. These are transformed
325 into ICE messages, which is much more user friendly. In case the
326 error printer crashes, reset the signal to prevent infinite recursion. */
329 crash_signal (int signo
)
331 signal (signo
, SIG_DFL
);
333 /* If we crashed while processing an ASM statement, then be a little more
334 graceful. It's most likely the user's fault. */
335 if (this_is_asm_operands
)
337 output_operand_lossage ("unrecoverable error");
338 exit (FATAL_EXIT_CODE
);
341 internal_error ("%s", strsignal (signo
));
344 /* A subroutine of wrapup_global_declarations. We've come to the end of
345 the compilation unit. All deferred variables should be undeferred,
346 and all incomplete decls should be finalized. */
349 wrapup_global_declaration_1 (tree decl
)
351 /* We're not deferring this any longer. Assignment is conditional to
352 avoid needlessly dirtying PCH pages. */
353 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl
), TS_DECL_WITH_VIS
)
354 && DECL_DEFER_OUTPUT (decl
) != 0)
355 DECL_DEFER_OUTPUT (decl
) = 0;
357 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0)
358 lang_hooks
.finish_incomplete_decl (decl
);
361 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
362 needs to be output. Return true if it is output. */
365 wrapup_global_declaration_2 (tree decl
)
367 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
)
368 || (TREE_CODE (decl
) == VAR_DECL
&& DECL_HAS_VALUE_EXPR_P (decl
)))
371 /* Don't write out static consts, unless we still need them.
373 We also keep static consts if not optimizing (for debugging),
374 unless the user specified -fno-keep-static-consts.
375 ??? They might be better written into the debug information.
376 This is possible when using DWARF.
378 A language processor that wants static constants to be always
379 written out (even if it is not used) is responsible for
380 calling rest_of_decl_compilation itself. E.g. the C front-end
381 calls rest_of_decl_compilation from finish_decl.
382 One motivation for this is that is conventional in some
383 environments to write things like:
384 static const char rcsid[] = "... version string ...";
385 intending to force the string to be in the executable.
387 A language processor that would prefer to have unneeded
388 static constants "optimized away" would just defer writing
389 them out until here. E.g. C++ does this, because static
390 constants are often defined in header files.
392 ??? A tempting alternative (for both C and C++) would be
393 to force a constant to be written if and only if it is
394 defined in a main file, as opposed to an include file. */
396 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
398 struct varpool_node
*node
;
400 node
= varpool_get_node (decl
);
402 if (!node
&& flag_ltrans
)
404 else if (node
&& node
->finalized
)
406 else if (node
&& node
->alias
)
408 else if (!cgraph_global_info_ready
410 || TREE_USED (DECL_ASSEMBLER_NAME (decl
))))
412 else if (node
&& node
->analyzed
)
414 else if (DECL_COMDAT (decl
))
416 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
417 && (optimize
|| !flag_keep_static_consts
418 || DECL_ARTIFICIAL (decl
)))
423 rest_of_decl_compilation (decl
, 1, 1);
431 /* Do any final processing required for the declarations in VEC, of
432 which there are LEN. We write out inline functions and variables
433 that have been deferred until this point, but which are required.
434 Returns nonzero if anything was put out. */
437 wrapup_global_declarations (tree
*vec
, int len
)
439 bool reconsider
, output_something
= false;
442 for (i
= 0; i
< len
; i
++)
443 wrapup_global_declaration_1 (vec
[i
]);
445 /* Now emit any global variables or functions that we have been
446 putting off. We need to loop in case one of the things emitted
447 here references another one which comes earlier in the list. */
451 for (i
= 0; i
< len
; i
++)
452 reconsider
|= wrapup_global_declaration_2 (vec
[i
]);
454 output_something
= true;
458 return output_something
;
461 /* A subroutine of check_global_declarations. Issue appropriate warnings
462 for the global declaration DECL. */
465 check_global_declaration_1 (tree decl
)
467 /* Warn about any function declared static but not defined. We don't
468 warn about variables, because many programs have static variables
469 that exist only to get some text into the object file. */
470 if (TREE_CODE (decl
) == FUNCTION_DECL
471 && DECL_INITIAL (decl
) == 0
472 && DECL_EXTERNAL (decl
)
473 && ! DECL_ARTIFICIAL (decl
)
474 && ! TREE_NO_WARNING (decl
)
475 && ! TREE_PUBLIC (decl
)
476 && (warn_unused_function
477 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
479 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
480 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
482 warning (OPT_Wunused_function
, "%q+F declared %<static%> but never defined", decl
);
483 /* This symbol is effectively an "extern" declaration now. */
484 TREE_PUBLIC (decl
) = 1;
487 /* Warn about static fns or vars defined but not used. */
488 if (((warn_unused_function
&& TREE_CODE (decl
) == FUNCTION_DECL
)
489 /* We don't warn about "static const" variables because the
490 "rcs_id" idiom uses that construction. */
491 || (warn_unused_variable
492 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
493 && ! DECL_IN_SYSTEM_HEADER (decl
)
494 && ! TREE_USED (decl
)
495 /* The TREE_USED bit for file-scope decls is kept in the identifier,
496 to handle multiple external decls in different scopes. */
497 && ! (DECL_NAME (decl
) && TREE_USED (DECL_NAME (decl
)))
498 && ! DECL_EXTERNAL (decl
)
499 && ! TREE_PUBLIC (decl
)
500 /* A volatile variable might be used in some non-obvious way. */
501 && ! TREE_THIS_VOLATILE (decl
)
502 /* Global register variables must be declared to reserve them. */
503 && ! (TREE_CODE (decl
) == VAR_DECL
&& DECL_REGISTER (decl
))
504 /* Otherwise, ask the language. */
505 && lang_hooks
.decls
.warn_unused_global (decl
))
506 warning ((TREE_CODE (decl
) == FUNCTION_DECL
)
507 ? OPT_Wunused_function
508 : OPT_Wunused_variable
,
509 "%q+D defined but not used", decl
);
512 /* Issue appropriate warnings for the global declarations in VEC (of
513 which there are LEN). */
516 check_global_declarations (tree
*vec
, int len
)
520 for (i
= 0; i
< len
; i
++)
521 check_global_declaration_1 (vec
[i
]);
524 /* Emit debugging information for all global declarations in VEC. */
527 emit_debug_global_declarations (tree
*vec
, int len
)
531 /* Avoid confusing the debug information machinery when there are errors. */
535 timevar_push (TV_SYMOUT
);
536 for (i
= 0; i
< len
; i
++)
537 debug_hooks
->global_decl (vec
[i
]);
538 timevar_pop (TV_SYMOUT
);
541 /* Compile an entire translation unit. Write a file of assembly
542 output and various debugging dumps. */
547 timevar_start (TV_PHASE_PARSING
);
548 timevar_push (TV_PARSE_GLOBAL
);
550 /* Call the parser, which parses the entire file (calling
551 rest_of_compilation for each function). */
552 lang_hooks
.parse_file ();
554 timevar_pop (TV_PARSE_GLOBAL
);
555 timevar_stop (TV_PHASE_PARSING
);
557 /* Compilation is now finished except for writing
558 what's left of the symbol table output. */
560 if (flag_syntax_only
|| flag_wpa
)
563 timevar_start (TV_PHASE_GENERATE
);
565 ggc_protect_identifiers
= false;
567 /* This must also call finalize_compilation_unit. */
568 lang_hooks
.decls
.final_write_globals ();
572 timevar_stop (TV_PHASE_GENERATE
);
576 /* Compilation unit is finalized. When producing non-fat LTO object, we are
577 basically finished. */
578 if (in_lto_p
|| !flag_lto
|| flag_fat_lto_objects
)
580 /* Likewise for mudflap static object registrations. */
582 mudflap_finish_file ();
584 output_shared_constant_pool ();
585 output_object_blocks ();
586 finish_tm_clone_pairs ();
588 /* Write out any pending weak symbol declarations. */
591 /* This must be at the end before unwind and debug info.
592 Some target ports emit PIC setup thunks here. */
593 targetm
.asm_out
.code_end ();
595 /* Do dbx symbols. */
596 timevar_push (TV_SYMOUT
);
598 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
599 if (dwarf2out_do_frame ())
600 dwarf2out_frame_finish ();
603 (*debug_hooks
->finish
) (main_input_filename
);
604 timevar_pop (TV_SYMOUT
);
606 /* Output some stuff at end of file if nec. */
608 dw2_output_indirect_constants ();
610 /* Flush any pending external directives. */
611 process_pending_assemble_externals ();
614 /* Emit LTO marker if LTO info has been previously emitted. This is
615 used by collect2 to determine whether an object file contains IL.
616 We used to emit an undefined reference here, but this produces
617 link errors if an object file with IL is stored into a shared
618 library without invoking lto1. */
619 if (flag_generate_lto
)
621 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
622 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
,
624 (unsigned HOST_WIDE_INT
) 1, 8);
625 #elif defined ASM_OUTPUT_ALIGNED_COMMON
626 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_v1",
627 (unsigned HOST_WIDE_INT
) 1, 8);
629 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_v1",
630 (unsigned HOST_WIDE_INT
) 1,
631 (unsigned HOST_WIDE_INT
) 1);
633 /* Let linker plugin know that this is a slim object and must be LTOed
634 even when user did not ask for it. */
635 if (!flag_fat_lto_objects
)
637 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
638 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
,
640 (unsigned HOST_WIDE_INT
) 1, 8);
641 #elif defined ASM_OUTPUT_ALIGNED_COMMON
642 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_slim",
643 (unsigned HOST_WIDE_INT
) 1, 8);
645 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_slim",
646 (unsigned HOST_WIDE_INT
) 1,
647 (unsigned HOST_WIDE_INT
) 1);
652 /* Attach a special .ident directive to the end of the file to identify
653 the version of GCC which compiled this code. The format of the .ident
654 string is patterned after the ones produced by native SVR4 compilers. */
658 const char *pkg_version
= "(GNU) ";
660 if (strcmp ("(GCC) ", pkgversion_string
))
661 pkg_version
= pkgversion_string
;
662 fprintf (asm_out_file
, "%s\"GCC: %s%s\"\n",
663 IDENT_ASM_OP
, pkg_version
, version_string
);
667 /* Invoke registered plugin callbacks. */
668 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT
, NULL
);
670 /* This must be at the end. Some target ports emit end of file directives
671 into the assembly file here, and hence we can not output anything to the
672 assembly file after this point. */
673 targetm
.asm_out
.file_end ();
675 timevar_stop (TV_PHASE_GENERATE
);
678 /* Print version information to FILE.
679 Each line begins with INDENT (for the case where FILE is the
680 assembler output file). */
683 print_version (FILE *file
, const char *indent
)
685 static const char fmt1
[] =
687 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
689 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
692 static const char fmt2
[] =
693 N_("GMP version %s, MPFR version %s, MPC version %s\n");
694 static const char fmt3
[] =
695 N_("%s%swarning: %s header version %s differs from library version %s.\n");
696 static const char fmt4
[] =
697 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
699 #define __VERSION__ "[?]"
702 file
== stderr
? _(fmt1
) : fmt1
,
703 indent
, *indent
!= 0 ? " " : "",
704 lang_hooks
.name
, pkgversion_string
, version_string
, TARGET_NAME
,
705 indent
, __VERSION__
);
707 /* We need to stringify the GMP macro values. Ugh, gmp_version has
708 two string formats, "i.j.k" and "i.j" when k is zero. As of
709 gmp-4.3.0, GMP always uses the 3 number format. */
710 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
711 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3(X)
712 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
713 #define GCC_GMP_VERSION \
714 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
715 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
716 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
717 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR)
719 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
720 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) "." \
721 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_PATCHLEVEL)
724 file
== stderr
? _(fmt2
) : fmt2
,
725 GCC_GMP_STRINGIFY_VERSION
, MPFR_VERSION_STRING
, MPC_VERSION_STRING
);
726 if (strcmp (GCC_GMP_STRINGIFY_VERSION
, gmp_version
))
728 file
== stderr
? _(fmt3
) : fmt3
,
729 indent
, *indent
!= 0 ? " " : "",
730 "GMP", GCC_GMP_STRINGIFY_VERSION
, gmp_version
);
731 if (strcmp (MPFR_VERSION_STRING
, mpfr_get_version ()))
733 file
== stderr
? _(fmt3
) : fmt3
,
734 indent
, *indent
!= 0 ? " " : "",
735 "MPFR", MPFR_VERSION_STRING
, mpfr_get_version ());
736 if (strcmp (MPC_VERSION_STRING
, mpc_get_version ()))
738 file
== stderr
? _(fmt3
) : fmt3
,
739 indent
, *indent
!= 0 ? " " : "",
740 "MPC", MPC_VERSION_STRING
, mpc_get_version ());
742 file
== stderr
? _(fmt4
) : fmt4
,
743 indent
, *indent
!= 0 ? " " : "",
744 PARAM_VALUE (GGC_MIN_EXPAND
), PARAM_VALUE (GGC_MIN_HEAPSIZE
));
746 print_plugins_versions (file
, indent
);
750 print_to_asm_out_file (print_switch_type type
, const char * text
)
752 bool prepend_sep
= true;
756 case SWITCH_TYPE_LINE_END
:
757 putc ('\n', asm_out_file
);
760 case SWITCH_TYPE_LINE_START
:
761 fputs (ASM_COMMENT_START
, asm_out_file
);
762 return strlen (ASM_COMMENT_START
);
764 case SWITCH_TYPE_DESCRIPTIVE
:
765 if (ASM_COMMENT_START
[0] == 0)
768 case SWITCH_TYPE_PASSED
:
769 case SWITCH_TYPE_ENABLED
:
771 fputc (' ', asm_out_file
);
772 fputs (text
, asm_out_file
);
773 /* No need to return the length here as
774 print_single_switch has already done it. */
783 print_to_stderr (print_switch_type type
, const char * text
)
787 case SWITCH_TYPE_LINE_END
:
791 case SWITCH_TYPE_LINE_START
:
794 case SWITCH_TYPE_PASSED
:
795 case SWITCH_TYPE_ENABLED
:
799 case SWITCH_TYPE_DESCRIPTIVE
:
800 fputs (text
, stderr
);
801 /* No need to return the length here as
802 print_single_switch has already done it. */
810 /* Print an option value and return the adjusted position in the line.
811 ??? print_fn doesn't handle errors, eg disk full; presumably other
812 code will catch a disk full though. */
815 print_single_switch (print_switch_fn_type print_fn
,
817 print_switch_type type
,
820 /* The ultrix fprintf returns 0 on success, so compute the result
821 we want here since we need it for the following test. The +1
822 is for the separator character that will probably be emitted. */
823 int len
= strlen (text
) + 1;
826 && pos
+ len
> MAX_LINE
)
828 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
833 pos
+= print_fn (SWITCH_TYPE_LINE_START
, NULL
);
835 print_fn (type
, text
);
839 /* Print active target switches using PRINT_FN.
840 POS is the current cursor position and MAX is the size of a "line".
841 Each line begins with INDENT and ends with TERM.
842 Each switch is separated from the next by SEP. */
845 print_switch_values (print_switch_fn_type print_fn
)
850 /* Fill in the -frandom-seed option, if the user didn't pass it, so
851 that it can be printed below. This helps reproducibility. */
852 if (!flag_random_seed
)
855 /* Print the options as passed. */
856 pos
= print_single_switch (print_fn
, pos
,
857 SWITCH_TYPE_DESCRIPTIVE
, _("options passed: "));
859 for (j
= 1; j
< save_decoded_options_count
; j
++)
861 switch (save_decoded_options
[j
].opt_index
)
874 pos
= print_single_switch (print_fn
, pos
, SWITCH_TYPE_PASSED
,
875 save_decoded_options
[j
].orig_option_with_args_text
);
879 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
881 /* Print the -f and -m options that have been enabled.
882 We don't handle language specific options but printing argv
884 pos
= print_single_switch (print_fn
, 0,
885 SWITCH_TYPE_DESCRIPTIVE
, _("options enabled: "));
887 for (j
= 0; j
< cl_options_count
; j
++)
888 if (cl_options
[j
].cl_report
889 && option_enabled (j
, &global_options
) > 0)
890 pos
= print_single_switch (print_fn
, pos
,
891 SWITCH_TYPE_ENABLED
, cl_options
[j
].opt_text
);
893 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
896 /* Open assembly code output file. Do this even if -fsyntax-only is
897 on, because then the driver will have provided the name of a
898 temporary file or bit bucket for us. NAME is the file specified on
899 the command line, possibly NULL. */
901 init_asm_output (const char *name
)
903 if (name
== NULL
&& asm_file_name
== 0)
904 asm_out_file
= stdout
;
907 if (asm_file_name
== 0)
909 int len
= strlen (dump_base_name
);
910 char *dumpname
= XNEWVEC (char, len
+ 6);
912 memcpy (dumpname
, dump_base_name
, len
+ 1);
913 strip_off_ending (dumpname
, len
);
914 strcat (dumpname
, ".s");
915 asm_file_name
= dumpname
;
917 if (!strcmp (asm_file_name
, "-"))
918 asm_out_file
= stdout
;
920 asm_out_file
= fopen (asm_file_name
, "w+b");
921 if (asm_out_file
== 0)
922 fatal_error ("can%'t open %s for writing: %m", asm_file_name
);
925 if (!flag_syntax_only
)
927 targetm
.asm_out
.file_start ();
929 if (flag_record_gcc_switches
)
931 if (targetm
.asm_out
.record_gcc_switches
)
933 /* Let the target know that we are about to start recording. */
934 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
936 /* Now record the switches. */
937 print_switch_values (targetm
.asm_out
.record_gcc_switches
);
938 /* Let the target know that the recording is over. */
939 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
943 inform (input_location
, "-frecord-gcc-switches is not supported by the current target");
946 if (flag_verbose_asm
)
948 /* Print the list of switches in effect
949 into the assembler file as comments. */
950 print_version (asm_out_file
, ASM_COMMENT_START
);
951 print_switch_values (print_to_asm_out_file
);
952 putc ('\n', asm_out_file
);
957 /* A helper function; used as the reallocator function for cpp's line
960 realloc_for_line_map (void *ptr
, size_t len
)
962 return GGC_RESIZEVAR (void, ptr
, len
);
965 /* A helper function: used as the allocator function for
966 identifier_to_locale. */
968 alloc_for_identifier_to_locale (size_t len
)
970 return ggc_alloc_atomic (len
);
973 /* Output stack usage information. */
975 output_stack_usage (void)
977 static bool warning_issued
= false;
978 enum stack_usage_kind_type
{ STATIC
= 0, DYNAMIC
, DYNAMIC_BOUNDED
};
979 const char *stack_usage_kind_str
[] = {
984 HOST_WIDE_INT stack_usage
= current_function_static_stack_size
;
985 enum stack_usage_kind_type stack_usage_kind
;
991 warning (0, "stack usage computation not supported for this target");
992 warning_issued
= true;
997 stack_usage_kind
= STATIC
;
999 /* Add the maximum amount of space pushed onto the stack. */
1000 if (current_function_pushed_stack_size
> 0)
1002 stack_usage
+= current_function_pushed_stack_size
;
1003 stack_usage_kind
= DYNAMIC_BOUNDED
;
1006 /* Now on to the tricky part: dynamic stack allocation. */
1007 if (current_function_allocates_dynamic_stack_space
)
1009 if (current_function_has_unbounded_dynamic_stack_size
)
1010 stack_usage_kind
= DYNAMIC
;
1012 stack_usage_kind
= DYNAMIC_BOUNDED
;
1014 /* Add the size even in the unbounded case, this can't hurt. */
1015 stack_usage
+= current_function_dynamic_stack_size
;
1018 if (flag_stack_usage
)
1020 expanded_location loc
1021 = expand_location (DECL_SOURCE_LOCATION (current_function_decl
));
1022 const char *raw_id
, *id
;
1024 /* Strip the scope prefix if any. */
1025 raw_id
= lang_hooks
.decl_printable_name (current_function_decl
, 2);
1026 id
= strrchr (raw_id
, '.');
1032 fprintf (stack_usage_file
,
1033 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC
"\t%s\n",
1034 lbasename (loc
.file
),
1039 stack_usage_kind_str
[stack_usage_kind
]);
1042 if (warn_stack_usage
>= 0)
1044 if (stack_usage_kind
== DYNAMIC
)
1045 warning (OPT_Wstack_usage_
, "stack usage might be unbounded");
1046 else if (stack_usage
> warn_stack_usage
)
1048 if (stack_usage_kind
== DYNAMIC_BOUNDED
)
1049 warning (OPT_Wstack_usage_
, "stack usage might be %wd bytes",
1052 warning (OPT_Wstack_usage_
, "stack usage is %wd bytes",
1058 /* Open an auxiliary output file. */
1060 open_auxiliary_file (const char *ext
)
1065 filename
= concat (aux_base_name
, ".", ext
, NULL
);
1066 file
= fopen (filename
, "w");
1068 fatal_error ("can%'t open %s for writing: %m", filename
);
1073 /* Initialization of the front end environment, before command line
1074 options are parsed. Signal handlers, internationalization etc.
1075 ARGV0 is main's argv[0]. */
1077 general_init (const char *argv0
)
1081 p
= argv0
+ strlen (argv0
);
1082 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
1086 xmalloc_set_program_name (progname
);
1090 /* Unlock the stdio streams. */
1091 unlock_std_streams ();
1093 gcc_init_libintl ();
1095 identifier_to_locale_alloc
= alloc_for_identifier_to_locale
;
1096 identifier_to_locale_free
= ggc_free
;
1098 /* Initialize the diagnostics reporting machinery, so option parsing
1099 can give warnings and errors. */
1100 diagnostic_initialize (global_dc
, N_OPTS
);
1101 /* Set a default printer. Language specific initializations will
1102 override it later. */
1103 tree_diagnostics_defaults (global_dc
);
1104 /* FIXME: This should probably be moved to C-family
1105 language-specific initializations. */
1106 /* By default print macro expansion contexts in the diagnostic
1107 finalizer -- for tokens resulting from macro expansion. */
1108 diagnostic_finalizer (global_dc
) = virt_loc_aware_diagnostic_finalizer
;
1110 global_dc
->show_caret
1111 = global_options_init
.x_flag_diagnostics_show_caret
;
1112 global_dc
->show_option_requested
1113 = global_options_init
.x_flag_diagnostics_show_option
;
1114 global_dc
->show_column
1115 = global_options_init
.x_flag_show_column
;
1116 global_dc
->internal_error
= plugins_internal_error_function
;
1117 global_dc
->option_enabled
= option_enabled
;
1118 global_dc
->option_state
= &global_options
;
1119 global_dc
->option_name
= option_name
;
1121 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1123 signal (SIGSEGV
, crash_signal
);
1126 signal (SIGILL
, crash_signal
);
1129 signal (SIGBUS
, crash_signal
);
1132 signal (SIGABRT
, crash_signal
);
1134 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1135 signal (SIGIOT
, crash_signal
);
1138 signal (SIGFPE
, crash_signal
);
1141 /* Other host-specific signal setup. */
1142 (*host_hooks
.extra_signals
)();
1144 /* Initialize the garbage-collector, string pools and tree type hash
1148 line_table
= ggc_alloc_line_maps ();
1149 linemap_init (line_table
);
1150 line_table
->reallocator
= realloc_for_line_map
;
1151 line_table
->round_alloc_size
= ggc_round_alloc_size
;
1154 /* Initialize register usage now so switches may override. */
1157 /* Register the language-independent parameters. */
1158 global_init_params ();
1160 /* This must be done after global_init_params but before argument
1162 init_ggc_heuristics();
1163 init_optimization_passes ();
1164 statistics_early_init ();
1168 /* Return true if the current target supports -fsection-anchors. */
1171 target_supports_section_anchors_p (void)
1173 if (targetm
.min_anchor_offset
== 0 && targetm
.max_anchor_offset
== 0)
1176 if (targetm
.asm_out
.output_anchor
== NULL
)
1182 /* Default the align_* variables to 1 if they're still unset, and
1183 set up the align_*_log variables. */
1185 init_alignments (void)
1187 if (align_loops
<= 0)
1189 if (align_loops_max_skip
> align_loops
)
1190 align_loops_max_skip
= align_loops
- 1;
1191 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
1192 if (align_jumps
<= 0)
1194 if (align_jumps_max_skip
> align_jumps
)
1195 align_jumps_max_skip
= align_jumps
- 1;
1196 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
1197 if (align_labels
<= 0)
1199 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
1200 if (align_labels_max_skip
> align_labels
)
1201 align_labels_max_skip
= align_labels
- 1;
1202 if (align_functions
<= 0)
1203 align_functions
= 1;
1204 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
1207 /* Process the options that have been parsed. */
1209 process_options (void)
1211 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1212 This can happen with incorrect pre-processed input. */
1213 debug_hooks
= &do_nothing_debug_hooks
;
1215 maximum_field_alignment
= initial_max_fld_align
* BITS_PER_UNIT
;
1217 /* Allow the front end to perform consistency checks and do further
1218 initialization based on the command line options. This hook also
1219 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1220 so we can correctly initialize debug output. */
1221 no_backend
= lang_hooks
.post_options (&main_input_filename
);
1223 /* Some machines may reject certain combinations of options. */
1224 targetm
.target_option
.override ();
1226 /* Avoid any informative notes in the second run of -fcompare-debug. */
1227 if (flag_compare_debug
)
1228 diagnostic_inhibit_notes (global_dc
);
1230 if (flag_section_anchors
&& !target_supports_section_anchors_p ())
1232 warning (OPT_fsection_anchors
,
1233 "this target does not support %qs", "-fsection-anchors");
1234 flag_section_anchors
= 0;
1237 if (flag_short_enums
== 2)
1238 flag_short_enums
= targetm
.default_short_enums ();
1240 /* Set aux_base_name if not already set. */
1243 else if (main_input_filename
)
1245 char *name
= xstrdup (lbasename (main_input_filename
));
1247 strip_off_ending (name
, strlen (name
));
1248 aux_base_name
= name
;
1251 aux_base_name
= "gccaux";
1255 || flag_graphite_identity
1257 || flag_loop_interchange
1258 || flag_loop_strip_mine
1259 || flag_loop_parallelize_all
)
1260 sorry ("Graphite loop optimizations cannot be used (-fgraphite, "
1261 "-fgraphite-identity, -floop-block, "
1262 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1263 "and -ftree-loop-linear)");
1266 if (flag_mudflap
&& flag_lto
)
1267 sorry ("mudflap cannot be used together with link-time optimization");
1269 /* One region RA really helps to decrease the code size. */
1270 if (flag_ira_region
== IRA_REGION_AUTODETECT
)
1272 = optimize_size
|| !optimize
? IRA_REGION_ONE
: IRA_REGION_MIXED
;
1274 if (flag_strict_volatile_bitfields
> 0 && !abi_version_at_least (2))
1276 warning (0, "-fstrict-volatile-bitfields disabled; "
1277 "it is incompatible with ABI versions < 2");
1278 flag_strict_volatile_bitfields
= 0;
1281 /* Unrolling all loops implies that standard loop unrolling must also
1283 if (flag_unroll_all_loops
)
1284 flag_unroll_loops
= 1;
1286 /* web and rename-registers help when run after loop unrolling. */
1287 if (flag_web
== AUTODETECT_VALUE
)
1288 flag_web
= flag_unroll_loops
|| flag_peel_loops
;
1290 if (flag_rename_registers
== AUTODETECT_VALUE
)
1291 flag_rename_registers
= flag_unroll_loops
|| flag_peel_loops
;
1293 if (flag_non_call_exceptions
)
1294 flag_asynchronous_unwind_tables
= 1;
1295 if (flag_asynchronous_unwind_tables
)
1296 flag_unwind_tables
= 1;
1298 if (flag_value_profile_transformations
)
1299 flag_profile_values
= 1;
1301 /* Warn about options that are not supported on this machine. */
1302 #ifndef INSN_SCHEDULING
1303 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
1304 warning (0, "instruction scheduling not supported on this target machine");
1307 if (flag_delayed_branch
)
1308 warning (0, "this target machine does not have delayed branches");
1311 user_label_prefix
= USER_LABEL_PREFIX
;
1312 if (flag_leading_underscore
!= -1)
1314 /* If the default prefix is more complicated than "" or "_",
1315 issue a warning and ignore this option. */
1316 if (user_label_prefix
[0] == 0 ||
1317 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
1319 user_label_prefix
= flag_leading_underscore
? "_" : "";
1322 warning (0, "-f%sleading-underscore not supported on this target machine",
1323 flag_leading_underscore
? "" : "no-");
1326 /* If we are in verbose mode, write out the version and maybe all the
1327 option flags in use. */
1330 print_version (stderr
, "");
1332 print_switch_values (print_to_stderr
);
1335 if (flag_syntax_only
)
1337 write_symbols
= NO_DEBUG
;
1343 if (debug_info_level
== DINFO_LEVEL_NONE
)
1345 debug_info_level
= DINFO_LEVEL_NORMAL
;
1347 if (write_symbols
== NO_DEBUG
)
1348 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
1351 debug_info_level
= DINFO_LEVEL_NONE
;
1354 if (flag_dump_final_insns
&& !flag_syntax_only
&& !no_backend
)
1356 FILE *final_output
= fopen (flag_dump_final_insns
, "w");
1359 error ("could not open final insn dump file %qs: %m",
1360 flag_dump_final_insns
);
1361 flag_dump_final_insns
= NULL
;
1363 else if (fclose (final_output
))
1365 error ("could not close zeroed insn dump file %qs: %m",
1366 flag_dump_final_insns
);
1367 flag_dump_final_insns
= NULL
;
1371 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1373 if (debug_info_level
== DINFO_LEVEL_NONE
)
1374 write_symbols
= NO_DEBUG
;
1376 if (write_symbols
== NO_DEBUG
)
1378 #if defined(DBX_DEBUGGING_INFO)
1379 else if (write_symbols
== DBX_DEBUG
)
1380 debug_hooks
= &dbx_debug_hooks
;
1382 #if defined(XCOFF_DEBUGGING_INFO)
1383 else if (write_symbols
== XCOFF_DEBUG
)
1384 debug_hooks
= &xcoff_debug_hooks
;
1386 #ifdef SDB_DEBUGGING_INFO
1387 else if (write_symbols
== SDB_DEBUG
)
1388 debug_hooks
= &sdb_debug_hooks
;
1390 #ifdef DWARF2_DEBUGGING_INFO
1391 else if (write_symbols
== DWARF2_DEBUG
)
1392 debug_hooks
= &dwarf2_debug_hooks
;
1394 #ifdef VMS_DEBUGGING_INFO
1395 else if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1396 debug_hooks
= &vmsdbg_debug_hooks
;
1399 error ("target system does not support the \"%s\" debug format",
1400 debug_type_names
[write_symbols
]);
1402 /* We know which debug output will be used so we can set flag_var_tracking
1403 and flag_var_tracking_uninit if the user has not specified them. */
1404 if (debug_info_level
< DINFO_LEVEL_NORMAL
1405 || debug_hooks
->var_location
== do_nothing_debug_hooks
.var_location
)
1407 if (flag_var_tracking
== 1
1408 || flag_var_tracking_uninit
== 1)
1410 if (debug_info_level
< DINFO_LEVEL_NORMAL
)
1411 warning (0, "variable tracking requested, but useless unless "
1412 "producing debug info");
1414 warning (0, "variable tracking requested, but not supported "
1415 "by this debug format");
1417 flag_var_tracking
= 0;
1418 flag_var_tracking_uninit
= 0;
1421 /* The debug hooks are used to implement -fdump-go-spec because it
1422 gives a simple and stable API for all the information we need to
1424 if (flag_dump_go_spec
!= NULL
)
1425 debug_hooks
= dump_go_spec_init (flag_dump_go_spec
, debug_hooks
);
1427 /* If the user specifically requested variable tracking with tagging
1428 uninitialized variables, we need to turn on variable tracking.
1429 (We already determined above that variable tracking is feasible.) */
1430 if (flag_var_tracking_uninit
)
1431 flag_var_tracking
= 1;
1433 if (flag_var_tracking
== AUTODETECT_VALUE
)
1434 flag_var_tracking
= optimize
>= 1;
1436 if (flag_var_tracking_assignments
== AUTODETECT_VALUE
)
1437 flag_var_tracking_assignments
= flag_var_tracking
1438 && !(flag_selective_scheduling
|| flag_selective_scheduling2
);
1440 if (flag_var_tracking_assignments_toggle
)
1441 flag_var_tracking_assignments
= !flag_var_tracking_assignments
;
1443 if (flag_var_tracking_assignments
&& !flag_var_tracking
)
1444 flag_var_tracking
= flag_var_tracking_assignments
= -1;
1446 if (flag_var_tracking_assignments
1447 && (flag_selective_scheduling
|| flag_selective_scheduling2
))
1448 warning (0, "var-tracking-assignments changes selective scheduling");
1450 if (flag_tree_cselim
== AUTODETECT_VALUE
)
1451 #ifdef HAVE_conditional_move
1452 flag_tree_cselim
= 1;
1454 flag_tree_cselim
= 0;
1457 /* If auxiliary info generation is desired, open the output file.
1458 This goes in the same directory as the source file--unlike
1459 all the other output files. */
1460 if (flag_gen_aux_info
)
1462 aux_info_file
= fopen (aux_info_file_name
, "w");
1463 if (aux_info_file
== 0)
1464 fatal_error ("can%'t open %s: %m", aux_info_file_name
);
1467 if (!targetm_common
.have_named_sections
)
1469 if (flag_function_sections
)
1471 warning (0, "-ffunction-sections not supported for this target");
1472 flag_function_sections
= 0;
1474 if (flag_data_sections
)
1476 warning (0, "-fdata-sections not supported for this target");
1477 flag_data_sections
= 0;
1481 if (flag_function_sections
&& profile_flag
)
1483 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
1484 flag_function_sections
= 0;
1487 #ifndef HAVE_prefetch
1488 if (flag_prefetch_loop_arrays
> 0)
1490 warning (0, "-fprefetch-loop-arrays not supported for this target");
1491 flag_prefetch_loop_arrays
= 0;
1494 if (flag_prefetch_loop_arrays
> 0 && !HAVE_prefetch
)
1496 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1497 flag_prefetch_loop_arrays
= 0;
1501 /* This combination of options isn't handled for i386 targets and doesn't
1502 make much sense anyway, so don't allow it. */
1503 if (flag_prefetch_loop_arrays
> 0 && optimize_size
)
1505 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1506 flag_prefetch_loop_arrays
= 0;
1509 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1510 if (flag_signaling_nans
)
1511 flag_trapping_math
= 1;
1513 /* We cannot reassociate if we want traps or signed zeros. */
1514 if (flag_associative_math
&& (flag_trapping_math
|| flag_signed_zeros
))
1516 warning (0, "-fassociative-math disabled; other options take precedence");
1517 flag_associative_math
= 0;
1520 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1521 if (flag_cx_limited_range
)
1522 flag_complex_method
= 0;
1524 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1525 if (flag_cx_fortran_rules
)
1526 flag_complex_method
= 1;
1528 /* Targets must be able to place spill slots at lower addresses. If the
1529 target already uses a soft frame pointer, the transition is trivial. */
1530 if (!FRAME_GROWS_DOWNWARD
&& flag_stack_protect
)
1532 warning (0, "-fstack-protector not supported for this target");
1533 flag_stack_protect
= 0;
1535 if (!flag_stack_protect
)
1536 warn_stack_protect
= 0;
1538 /* ??? Unwind info is not correct around the CFG unless either a frame
1539 pointer is present or A_O_A is set. Fixing this requires rewriting
1540 unwind info generation to be aware of the CFG and propagating states
1542 if (flag_unwind_tables
&& !ACCUMULATE_OUTGOING_ARGS
1543 && flag_omit_frame_pointer
)
1545 warning (0, "unwind tables currently require a frame pointer "
1547 flag_omit_frame_pointer
= 0;
1550 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1551 have not been set. */
1552 if (!global_options_set
.x_warnings_are_errors
1553 && warn_coverage_mismatch
1554 && (global_dc
->classify_diagnostic
[OPT_Wcoverage_mismatch
] ==
1556 diagnostic_classify_diagnostic (global_dc
, OPT_Wcoverage_mismatch
,
1557 DK_ERROR
, UNKNOWN_LOCATION
);
1559 /* Save the current optimization options. */
1560 optimization_default_node
= build_optimization_node ();
1561 optimization_current_node
= optimization_default_node
;
1564 /* This function can be called multiple times to reinitialize the compiler
1565 back end when register classes or instruction sets have changed,
1566 before each function. */
1568 backend_init_target (void)
1570 /* Initialize alignment variables. */
1573 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
1574 to initialize reg_raw_mode[]. */
1577 /* This invokes target hooks to set fixed_reg[] etc, which is
1581 /* This depends on stack_pointer_rtx. */
1582 init_fake_stack_mems ();
1584 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1586 init_alias_target ();
1588 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1591 /* The following initialization functions need to generate rtl, so
1592 provide a dummy function context for them. */
1593 init_dummy_function_start ();
1595 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1596 on a mode change. */
1598 init_lower_subreg ();
1600 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1601 after a mode change as well. */
1602 caller_save_initialized_p
= false;
1604 expand_dummy_function_end ();
1607 /* Initialize the compiler back end. This function is called only once,
1608 when starting the compiler. */
1615 init_inline_once ();
1616 init_varasm_once ();
1617 save_register_info ();
1619 /* Initialize the target-specific back end pieces. */
1621 backend_init_target ();
1624 /* Initialize excess precision settings. */
1626 init_excess_precision (void)
1628 /* Adjust excess precision handling based on the target options. If
1629 the front end cannot handle it, flag_excess_precision_cmdline
1630 will already have been set accordingly in the post_options
1632 gcc_assert (flag_excess_precision_cmdline
!= EXCESS_PRECISION_DEFAULT
);
1633 flag_excess_precision
= flag_excess_precision_cmdline
;
1634 if (flag_unsafe_math_optimizations
)
1635 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1636 if (flag_excess_precision
== EXCESS_PRECISION_STANDARD
)
1638 int flt_eval_method
= TARGET_FLT_EVAL_METHOD
;
1639 switch (flt_eval_method
)
1643 /* Either the target acts unpredictably (-1) or has all the
1644 operations required not to have excess precision (0). */
1645 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1649 /* In these cases, predictable excess precision makes
1653 /* Any other implementation-defined FLT_EVAL_METHOD values
1654 require the compiler to handle the associated excess
1655 precision rules in excess_precision_type. */
1661 /* Initialize things that are both lang-dependent and target-dependent.
1662 This function can be called more than once if target parameters change. */
1664 lang_dependent_init_target (void)
1666 /* This determines excess precision settings. */
1667 init_excess_precision ();
1669 /* This creates various _DECL nodes, so needs to be called after the
1670 front end is initialized. It also depends on the HAVE_xxx macros
1671 generated from the target machine description. */
1674 /* The following initialization functions need to generate rtl, so
1675 provide a dummy function context for them. */
1676 init_dummy_function_start ();
1678 /* Do the target-specific parts of expr initialization. */
1679 init_expr_target ();
1681 /* Although the actions of these functions are language-independent,
1682 they use optabs, so we cannot call them from backend_init. */
1686 expand_dummy_function_end ();
1689 /* Language-dependent initialization. Returns nonzero on success. */
1691 lang_dependent_init (const char *name
)
1693 location_t save_loc
= input_location
;
1694 if (dump_base_name
== 0)
1695 dump_base_name
= name
&& name
[0] ? name
: "gccdump";
1697 /* Other front-end initialization. */
1698 input_location
= BUILTINS_LOCATION
;
1699 if (lang_hooks
.init () == 0)
1701 input_location
= save_loc
;
1705 init_asm_output (name
);
1707 /* If stack usage information is desired, open the output file. */
1708 if (flag_stack_usage
)
1709 stack_usage_file
= open_auxiliary_file ("su");
1712 /* This creates various _DECL nodes, so needs to be called after the
1713 front end is initialized. */
1716 /* Do the target-specific parts of the initialization. */
1717 lang_dependent_init_target ();
1721 /* If dbx symbol table desired, initialize writing it and output the
1722 predefined types. */
1723 timevar_push (TV_SYMOUT
);
1725 /* Now we have the correct original filename, we can initialize
1727 (*debug_hooks
->init
) (name
);
1729 timevar_pop (TV_SYMOUT
);
1736 /* Reinitialize everything when target parameters, such as register usage,
1739 target_reinit (void)
1741 struct rtl_data saved_x_rtl
;
1742 rtx
*saved_regno_reg_rtx
;
1744 /* Save *crtl and regno_reg_rtx around the reinitialization
1745 to allow target_reinit being called even after prepare_function_start. */
1746 saved_regno_reg_rtx
= regno_reg_rtx
;
1747 if (saved_regno_reg_rtx
)
1749 saved_x_rtl
= *crtl
;
1750 memset (crtl
, '\0', sizeof (*crtl
));
1751 regno_reg_rtx
= NULL
;
1754 /* Reinitialize RTL backend. */
1755 backend_init_target ();
1757 /* Reinitialize lang-dependent parts. */
1758 lang_dependent_init_target ();
1760 /* And restore it at the end, as free_after_compilation from
1761 expand_dummy_function_end clears it. */
1762 if (saved_regno_reg_rtx
)
1764 *crtl
= saved_x_rtl
;
1765 regno_reg_rtx
= saved_regno_reg_rtx
;
1766 saved_regno_reg_rtx
= NULL
;
1771 dump_memory_report (bool final
)
1773 dump_line_table_statistics ();
1774 ggc_print_statistics ();
1775 stringpool_statistics ();
1776 dump_tree_statistics ();
1777 dump_gimple_statistics ();
1778 dump_rtx_statistics ();
1779 dump_alloc_pool_statistics ();
1780 dump_bitmap_statistics ();
1781 dump_vec_loc_statistics ();
1782 dump_ggc_loc_statistics (final
);
1783 dump_alias_stats (stderr
);
1784 dump_pta_stats (stderr
);
1787 /* Clean up: close opened files, etc. */
1790 finalize (bool no_backend
)
1792 /* Close the dump files. */
1793 if (flag_gen_aux_info
)
1795 fclose (aux_info_file
);
1797 unlink (aux_info_file_name
);
1800 /* Close non-debugging input and output files. Take special care to note
1801 whether fclose returns an error, since the pages might still be on the
1802 buffer chain while the file is open. */
1806 if (ferror (asm_out_file
) != 0)
1807 fatal_error ("error writing to %s: %m", asm_file_name
);
1808 if (fclose (asm_out_file
) != 0)
1809 fatal_error ("error closing %s: %m", asm_file_name
);
1812 if (stack_usage_file
)
1813 fclose (stack_usage_file
);
1819 finish_optimization_passes ();
1825 dump_memory_report (true);
1827 /* Language-specific end of compilation actions. */
1828 lang_hooks
.finish ();
1831 /* Initialize the compiler, and compile the input file. */
1835 /* Initialize timing first. The C front ends read the main file in
1836 the post_options hook, and C++ does file timings. */
1837 if (time_report
|| !quiet_flag
|| flag_detailed_statistics
)
1839 timevar_start (TV_TOTAL
);
1843 /* Don't do any more if an error has already occurred. */
1846 timevar_start (TV_PHASE_SETUP
);
1848 /* This must be run always, because it is needed to compute the FP
1849 predefined macros, such as __LDBL_MAX__, for targets using non
1850 default FP formats. */
1851 init_adjust_machine_modes ();
1853 /* Set up the back-end if requested. */
1857 /* Language-dependent initialization. Returns true on success. */
1858 if (lang_dependent_init (main_input_filename
))
1860 /* Initialize yet another pass. */
1862 ggc_protect_identifiers
= true;
1865 init_final (main_input_filename
);
1866 coverage_init (aux_base_name
);
1868 invoke_plugin_callbacks (PLUGIN_START_UNIT
, NULL
);
1870 timevar_stop (TV_PHASE_SETUP
);
1876 timevar_stop (TV_PHASE_SETUP
);
1879 timevar_start (TV_PHASE_FINALIZE
);
1881 finalize (no_backend
);
1883 timevar_stop (TV_PHASE_FINALIZE
);
1886 /* Stop timing and print the times. */
1887 timevar_stop (TV_TOTAL
);
1888 timevar_print (stderr
);
1891 /* Entry point of cc1, cc1plus, jc1, f771, etc.
1892 Exit code is FATAL_EXIT_CODE if can't open files or if there were
1893 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
1895 It is not safe to call this function more than once. */
1898 toplev_main (int argc
, char **argv
)
1900 /* Parsing and gimplification sometimes need quite large stack.
1901 Increase stack size limits if possible. */
1902 stack_limit_increase (64 * 1024 * 1024);
1904 expandargv (&argc
, &argv
);
1906 /* Initialization of GCC's environment, and diagnostics. */
1907 general_init (argv
[0]);
1909 /* One-off initialization of options that does not need to be
1910 repeated when options are added for particular functions. */
1911 init_options_once ();
1913 /* Initialize global options structures; this must be repeated for
1914 each structure used for parsing options. */
1915 init_options_struct (&global_options
, &global_options_set
);
1916 lang_hooks
.init_options_struct (&global_options
);
1918 /* Convert the options to an array. */
1919 decode_cmdline_options_to_array_default_mask (argc
,
1920 CONST_CAST2 (const char **,
1922 &save_decoded_options
,
1923 &save_decoded_options_count
);
1925 /* Perform language-specific options initialization. */
1926 lang_hooks
.init_options (save_decoded_options_count
, save_decoded_options
);
1928 /* Parse the options and do minimal processing; basically just
1929 enough to default flags appropriately. */
1930 decode_options (&global_options
, &global_options_set
,
1931 save_decoded_options
, save_decoded_options_count
,
1932 UNKNOWN_LOCATION
, global_dc
);
1934 handle_common_deferred_options ();
1938 initialize_plugins ();
1941 print_version (stderr
, "");
1944 print_plugins_help (stderr
, "");
1946 /* Exit early if we can (e.g. -help). */
1947 if (!exit_after_options
)
1950 if (warningcount
|| errorcount
)
1951 print_ignored_options ();
1952 diagnostic_finish (global_dc
);
1954 /* Invoke registered plugin callbacks if any. */
1955 invoke_plugin_callbacks (PLUGIN_FINISH
, NULL
);
1957 finalize_plugins ();
1959 return (FATAL_EXIT_CODE
);
1961 return (SUCCESS_EXIT_CODE
);