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"
77 #include "tree-pass.h"
79 #include "tree-ssa-alias.h"
82 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
83 #include "dwarf2out.h"
86 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
90 #ifdef SDB_DEBUGGING_INFO
94 #ifdef XCOFF_DEBUGGING_INFO
95 #include "xcoffout.h" /* Needed for external data
96 declarations for e.g. AIX 4.x. */
99 static void general_init (const char *);
100 static void do_compile (void);
101 static void process_options (void);
102 static void backend_init (void);
103 static int lang_dependent_init (const char *);
104 static void init_asm_output (const char *);
105 static void finalize (bool);
107 static void crash_signal (int) ATTRIBUTE_NORETURN
;
108 static void compile_file (void);
110 /* True if we don't need a backend (e.g. preprocessing only). */
111 static bool no_backend
;
113 /* Length of line when printing switch values. */
116 /* Decoded options, and number of such options. */
117 struct cl_decoded_option
*save_decoded_options
;
118 unsigned int save_decoded_options_count
;
120 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
121 to optimize in process_options (). */
122 #define AUTODETECT_VALUE 2
124 /* Debug hooks - dependent upon command line options. */
126 const struct gcc_debug_hooks
*debug_hooks
;
128 /* The FUNCTION_DECL for the function currently being compiled,
129 or 0 if between functions. */
130 tree current_function_decl
;
132 /* Set to the FUNC_BEGIN label of the current function, or NULL
134 const char * current_function_func_begin_label
;
136 /* A random sequence of characters, unless overridden by user. */
137 static const char *flag_random_seed
;
139 /* A local time stamp derived from the time of compilation. It will be
140 zero if the system cannot provide a time. It will be -1u, if the
141 user has specified a particular random seed. */
146 /* Generate code for GNU or NeXT Objective-C runtime environment. */
148 #ifdef NEXT_OBJC_RUNTIME
149 int flag_next_runtime
= 1;
151 int flag_next_runtime
= 0;
154 /* Nonzero means make permerror produce warnings instead of errors. */
156 int flag_permissive
= 0;
158 /* When non-NULL, indicates that whenever space is allocated on the
159 stack, the resulting stack pointer must not pass this
160 address---that is, for stacks that grow downward, the stack pointer
161 must always be greater than or equal to this address; for stacks
162 that grow upward, the stack pointer must be less than this address.
163 At present, the rtx may be either a REG or a SYMBOL_REF, although
164 the support provided depends on the backend. */
167 /* True if the user has tagged the function with the 'section'
170 bool user_defined_section_attribute
= false;
172 struct target_flag_state default_target_flag_state
;
173 #if SWITCHABLE_TARGET
174 struct target_flag_state
*this_target_flag_state
= &default_target_flag_state
;
176 #define this_target_flag_state (&default_target_flag_state)
179 /* The user symbol prefix after having resolved same. */
180 const char *user_label_prefix
;
182 /* Output files for assembler code (real compiler output)
183 and debugging dumps. */
187 FILE *stack_usage_file
= NULL
;
188 FILE *dump_file
= NULL
;
189 const char *dump_file_name
;
191 /* The current working directory of a translation. It's generally the
192 directory from which compilation was initiated, but a preprocessed
193 file may specify the original directory in which it was
196 static const char *src_pwd
;
198 /* Initialize src_pwd with the given string, and return true. If it
199 was already initialized, return false. As a special case, it may
200 be called with a NULL argument to test whether src_pwd has NOT been
204 set_src_pwd (const char *pwd
)
208 if (strcmp (src_pwd
, pwd
) == 0)
214 src_pwd
= xstrdup (pwd
);
218 /* Return the directory from which the translation unit was initiated,
219 in case set_src_pwd() was not called before to assign it a
235 /* Called when the start of a function definition is parsed,
236 this function prints on stderr the name of the function. */
238 announce_function (tree decl
)
242 if (rtl_dump_and_exit
)
243 fprintf (stderr
, "%s ",
244 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl
))));
246 fprintf (stderr
, " %s",
247 identifier_to_locale (lang_hooks
.decl_printable_name (decl
, 2)));
249 pp_needs_newline (global_dc
->printer
) = true;
250 diagnostic_set_last_function (global_dc
, (diagnostic_info
*) NULL
);
254 /* Initialize local_tick with the time of day, or -1 if
255 flag_random_seed is set. */
258 init_local_tick (void)
260 if (!flag_random_seed
)
262 /* Get some more or less random data. */
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 unsigned HOST_WIDE_INT value
;
290 static char random_seed
[HOST_BITS_PER_WIDE_INT
/ 4 + 3];
292 value
= local_tick
^ getpid ();
294 sprintf (random_seed
, HOST_WIDE_INT_PRINT_HEX
, value
);
295 flag_random_seed
= random_seed
;
298 /* Obtain the random_seed string. Unless NOINIT, initialize it if
299 it's not provided in the command line. */
302 get_random_seed (bool noinit
)
304 if (!flag_random_seed
&& !noinit
)
306 return flag_random_seed
;
309 /* Modify the random_seed string to VAL. Return its previous
313 set_random_seed (const char *val
)
315 const char *old
= flag_random_seed
;
316 flag_random_seed
= val
;
320 /* Handler for fatal signals, such as SIGSEGV. These are transformed
321 into ICE messages, which is much more user friendly. In case the
322 error printer crashes, reset the signal to prevent infinite recursion. */
325 crash_signal (int signo
)
327 signal (signo
, SIG_DFL
);
329 /* If we crashed while processing an ASM statement, then be a little more
330 graceful. It's most likely the user's fault. */
331 if (this_is_asm_operands
)
333 output_operand_lossage ("unrecoverable error");
334 exit (FATAL_EXIT_CODE
);
337 internal_error ("%s", strsignal (signo
));
340 /* A subroutine of wrapup_global_declarations. We've come to the end of
341 the compilation unit. All deferred variables should be undeferred,
342 and all incomplete decls should be finalized. */
345 wrapup_global_declaration_1 (tree decl
)
347 /* We're not deferring this any longer. Assignment is conditional to
348 avoid needlessly dirtying PCH pages. */
349 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl
), TS_DECL_WITH_VIS
)
350 && DECL_DEFER_OUTPUT (decl
) != 0)
351 DECL_DEFER_OUTPUT (decl
) = 0;
353 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0)
354 lang_hooks
.finish_incomplete_decl (decl
);
357 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
358 needs to be output. Return true if it is output. */
361 wrapup_global_declaration_2 (tree decl
)
363 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
366 /* Don't write out static consts, unless we still need them.
368 We also keep static consts if not optimizing (for debugging),
369 unless the user specified -fno-keep-static-consts.
370 ??? They might be better written into the debug information.
371 This is possible when using DWARF.
373 A language processor that wants static constants to be always
374 written out (even if it is not used) is responsible for
375 calling rest_of_decl_compilation itself. E.g. the C front-end
376 calls rest_of_decl_compilation from finish_decl.
377 One motivation for this is that is conventional in some
378 environments to write things like:
379 static const char rcsid[] = "... version string ...";
380 intending to force the string to be in the executable.
382 A language processor that would prefer to have unneeded
383 static constants "optimized away" would just defer writing
384 them out until here. E.g. C++ does this, because static
385 constants are often defined in header files.
387 ??? A tempting alternative (for both C and C++) would be
388 to force a constant to be written if and only if it is
389 defined in a main file, as opposed to an include file. */
391 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
393 struct varpool_node
*node
;
395 node
= varpool_get_node (decl
);
397 if (!node
&& flag_ltrans
)
399 else if (node
&& node
->finalized
)
401 else if (node
&& node
->alias
)
403 else if (!cgraph_global_info_ready
405 || TREE_USED (DECL_ASSEMBLER_NAME (decl
))))
407 else if (node
&& node
->needed
)
409 else if (DECL_COMDAT (decl
))
411 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
412 && (optimize
|| !flag_keep_static_consts
413 || DECL_ARTIFICIAL (decl
)))
418 rest_of_decl_compilation (decl
, 1, 1);
426 /* Do any final processing required for the declarations in VEC, of
427 which there are LEN. We write out inline functions and variables
428 that have been deferred until this point, but which are required.
429 Returns nonzero if anything was put out. */
432 wrapup_global_declarations (tree
*vec
, int len
)
434 bool reconsider
, output_something
= false;
437 for (i
= 0; i
< len
; i
++)
438 wrapup_global_declaration_1 (vec
[i
]);
440 /* Now emit any global variables or functions that we have been
441 putting off. We need to loop in case one of the things emitted
442 here references another one which comes earlier in the list. */
446 for (i
= 0; i
< len
; i
++)
447 reconsider
|= wrapup_global_declaration_2 (vec
[i
]);
449 output_something
= true;
453 return output_something
;
456 /* A subroutine of check_global_declarations. Issue appropriate warnings
457 for the global declaration DECL. */
460 check_global_declaration_1 (tree decl
)
462 /* Warn about any function declared static but not defined. We don't
463 warn about variables, because many programs have static variables
464 that exist only to get some text into the object file. */
465 if (TREE_CODE (decl
) == FUNCTION_DECL
466 && DECL_INITIAL (decl
) == 0
467 && DECL_EXTERNAL (decl
)
468 && ! DECL_ARTIFICIAL (decl
)
469 && ! TREE_NO_WARNING (decl
)
470 && ! TREE_PUBLIC (decl
)
471 && (warn_unused_function
472 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
474 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
475 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
477 warning (OPT_Wunused_function
, "%q+F declared %<static%> but never defined", decl
);
478 /* This symbol is effectively an "extern" declaration now. */
479 TREE_PUBLIC (decl
) = 1;
480 assemble_external (decl
);
483 /* Warn about static fns or vars defined but not used. */
484 if (((warn_unused_function
&& TREE_CODE (decl
) == FUNCTION_DECL
)
485 /* We don't warn about "static const" variables because the
486 "rcs_id" idiom uses that construction. */
487 || (warn_unused_variable
488 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
489 && ! DECL_IN_SYSTEM_HEADER (decl
)
490 && ! TREE_USED (decl
)
491 /* The TREE_USED bit for file-scope decls is kept in the identifier,
492 to handle multiple external decls in different scopes. */
493 && ! (DECL_NAME (decl
) && TREE_USED (DECL_NAME (decl
)))
494 && ! DECL_EXTERNAL (decl
)
495 && ! TREE_PUBLIC (decl
)
496 /* A volatile variable might be used in some non-obvious way. */
497 && ! TREE_THIS_VOLATILE (decl
)
498 /* Global register variables must be declared to reserve them. */
499 && ! (TREE_CODE (decl
) == VAR_DECL
&& DECL_REGISTER (decl
))
500 /* Otherwise, ask the language. */
501 && lang_hooks
.decls
.warn_unused_global (decl
))
502 warning ((TREE_CODE (decl
) == FUNCTION_DECL
)
503 ? OPT_Wunused_function
504 : OPT_Wunused_variable
,
505 "%q+D defined but not used", decl
);
508 /* Issue appropriate warnings for the global declarations in VEC (of
509 which there are LEN). */
512 check_global_declarations (tree
*vec
, int len
)
516 for (i
= 0; i
< len
; i
++)
517 check_global_declaration_1 (vec
[i
]);
520 /* Emit debugging information for all global declarations in VEC. */
523 emit_debug_global_declarations (tree
*vec
, int len
)
527 /* Avoid confusing the debug information machinery when there are errors. */
531 timevar_push (TV_SYMOUT
);
532 for (i
= 0; i
< len
; i
++)
533 debug_hooks
->global_decl (vec
[i
]);
534 timevar_pop (TV_SYMOUT
);
537 /* Compile an entire translation unit. Write a file of assembly
538 output and various debugging dumps. */
543 timevar_start (TV_PHASE_PARSING
);
544 timevar_push (TV_PARSE_GLOBAL
);
546 /* Call the parser, which parses the entire file (calling
547 rest_of_compilation for each function). */
548 lang_hooks
.parse_file ();
550 timevar_pop (TV_PARSE_GLOBAL
);
551 timevar_stop (TV_PHASE_PARSING
);
553 /* Compilation is now finished except for writing
554 what's left of the symbol table output. */
556 if (flag_syntax_only
|| flag_wpa
)
559 timevar_start (TV_PHASE_GENERATE
);
561 ggc_protect_identifiers
= false;
563 /* This must also call cgraph_finalize_compilation_unit. */
564 lang_hooks
.decls
.final_write_globals ();
568 timevar_stop (TV_PHASE_GENERATE
);
572 varpool_assemble_pending_decls ();
575 /* Likewise for mudflap static object registrations. */
577 mudflap_finish_file ();
579 output_shared_constant_pool ();
580 output_object_blocks ();
582 /* Write out any pending weak symbol declarations. */
585 /* This must be at the end before unwind and debug info.
586 Some target ports emit PIC setup thunks here. */
587 targetm
.asm_out
.code_end ();
589 /* Do dbx symbols. */
590 timevar_push (TV_SYMOUT
);
592 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
593 if (dwarf2out_do_frame ())
594 dwarf2out_frame_finish ();
597 (*debug_hooks
->finish
) (main_input_filename
);
598 timevar_pop (TV_SYMOUT
);
600 /* Output some stuff at end of file if nec. */
602 dw2_output_indirect_constants ();
604 /* Flush any pending external directives. */
605 process_pending_assemble_externals ();
607 /* Emit LTO marker if LTO info has been previously emitted. This is
608 used by collect2 to determine whether an object file contains IL.
609 We used to emit an undefined reference here, but this produces
610 link errors if an object file with IL is stored into a shared
611 library without invoking lto1. */
612 if (flag_generate_lto
)
614 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
615 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
,
617 (unsigned HOST_WIDE_INT
) 1, 8);
618 #elif defined ASM_OUTPUT_ALIGNED_COMMON
619 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_v1",
620 (unsigned HOST_WIDE_INT
) 1, 8);
622 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_v1",
623 (unsigned HOST_WIDE_INT
) 1,
624 (unsigned HOST_WIDE_INT
) 1);
628 /* Attach a special .ident directive to the end of the file to identify
629 the version of GCC which compiled this code. The format of the .ident
630 string is patterned after the ones produced by native SVR4 compilers. */
634 const char *pkg_version
= "(GNU) ";
636 if (strcmp ("(GCC) ", pkgversion_string
))
637 pkg_version
= pkgversion_string
;
638 fprintf (asm_out_file
, "%s\"GCC: %s%s\"\n",
639 IDENT_ASM_OP
, pkg_version
, version_string
);
643 /* Invoke registered plugin callbacks. */
644 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT
, NULL
);
646 /* This must be at the end. Some target ports emit end of file directives
647 into the assembly file here, and hence we can not output anything to the
648 assembly file after this point. */
649 targetm
.asm_out
.file_end ();
651 timevar_stop (TV_PHASE_GENERATE
);
654 /* Print version information to FILE.
655 Each line begins with INDENT (for the case where FILE is the
656 assembler output file). */
659 print_version (FILE *file
, const char *indent
)
661 static const char fmt1
[] =
663 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
665 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
668 static const char fmt2
[] =
669 N_("GMP version %s, MPFR version %s, MPC version %s\n");
670 static const char fmt3
[] =
671 N_("%s%swarning: %s header version %s differs from library version %s.\n");
672 static const char fmt4
[] =
673 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
675 #define __VERSION__ "[?]"
678 file
== stderr
? _(fmt1
) : fmt1
,
679 indent
, *indent
!= 0 ? " " : "",
680 lang_hooks
.name
, pkgversion_string
, version_string
, TARGET_NAME
,
681 indent
, __VERSION__
);
683 /* We need to stringify the GMP macro values. Ugh, gmp_version has
684 two string formats, "i.j.k" and "i.j" when k is zero. As of
685 gmp-4.3.0, GMP always uses the 3 number format. */
686 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
687 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3(X)
688 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
689 #define GCC_GMP_VERSION \
690 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
691 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
692 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
693 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR)
695 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
696 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) "." \
697 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_PATCHLEVEL)
700 file
== stderr
? _(fmt2
) : fmt2
,
701 GCC_GMP_STRINGIFY_VERSION
, MPFR_VERSION_STRING
, MPC_VERSION_STRING
);
702 if (strcmp (GCC_GMP_STRINGIFY_VERSION
, gmp_version
))
704 file
== stderr
? _(fmt3
) : fmt3
,
705 indent
, *indent
!= 0 ? " " : "",
706 "GMP", GCC_GMP_STRINGIFY_VERSION
, gmp_version
);
707 if (strcmp (MPFR_VERSION_STRING
, mpfr_get_version ()))
709 file
== stderr
? _(fmt3
) : fmt3
,
710 indent
, *indent
!= 0 ? " " : "",
711 "MPFR", MPFR_VERSION_STRING
, mpfr_get_version ());
712 if (strcmp (MPC_VERSION_STRING
, mpc_get_version ()))
714 file
== stderr
? _(fmt3
) : fmt3
,
715 indent
, *indent
!= 0 ? " " : "",
716 "MPC", MPC_VERSION_STRING
, mpc_get_version ());
718 file
== stderr
? _(fmt4
) : fmt4
,
719 indent
, *indent
!= 0 ? " " : "",
720 PARAM_VALUE (GGC_MIN_EXPAND
), PARAM_VALUE (GGC_MIN_HEAPSIZE
));
722 print_plugins_versions (file
, indent
);
725 #ifdef ASM_COMMENT_START
727 print_to_asm_out_file (print_switch_type type
, const char * text
)
729 bool prepend_sep
= true;
733 case SWITCH_TYPE_LINE_END
:
734 putc ('\n', asm_out_file
);
737 case SWITCH_TYPE_LINE_START
:
738 fputs (ASM_COMMENT_START
, asm_out_file
);
739 return strlen (ASM_COMMENT_START
);
741 case SWITCH_TYPE_DESCRIPTIVE
:
742 if (ASM_COMMENT_START
[0] == 0)
745 case SWITCH_TYPE_PASSED
:
746 case SWITCH_TYPE_ENABLED
:
748 fputc (' ', asm_out_file
);
749 fputs (text
, asm_out_file
);
750 /* No need to return the length here as
751 print_single_switch has already done it. */
761 print_to_stderr (print_switch_type type
, const char * text
)
765 case SWITCH_TYPE_LINE_END
:
769 case SWITCH_TYPE_LINE_START
:
772 case SWITCH_TYPE_PASSED
:
773 case SWITCH_TYPE_ENABLED
:
777 case SWITCH_TYPE_DESCRIPTIVE
:
778 fputs (text
, stderr
);
779 /* No need to return the length here as
780 print_single_switch has already done it. */
788 /* Print an option value and return the adjusted position in the line.
789 ??? print_fn doesn't handle errors, eg disk full; presumably other
790 code will catch a disk full though. */
793 print_single_switch (print_switch_fn_type print_fn
,
795 print_switch_type type
,
798 /* The ultrix fprintf returns 0 on success, so compute the result
799 we want here since we need it for the following test. The +1
800 is for the separator character that will probably be emitted. */
801 int len
= strlen (text
) + 1;
804 && pos
+ len
> MAX_LINE
)
806 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
811 pos
+= print_fn (SWITCH_TYPE_LINE_START
, NULL
);
813 print_fn (type
, text
);
817 /* Print active target switches using PRINT_FN.
818 POS is the current cursor position and MAX is the size of a "line".
819 Each line begins with INDENT and ends with TERM.
820 Each switch is separated from the next by SEP. */
823 print_switch_values (print_switch_fn_type print_fn
)
828 /* Fill in the -frandom-seed option, if the user didn't pass it, so
829 that it can be printed below. This helps reproducibility. */
830 if (!flag_random_seed
)
833 /* Print the options as passed. */
834 pos
= print_single_switch (print_fn
, pos
,
835 SWITCH_TYPE_DESCRIPTIVE
, _("options passed: "));
837 for (j
= 1; j
< save_decoded_options_count
; j
++)
839 switch (save_decoded_options
[j
].opt_index
)
852 pos
= print_single_switch (print_fn
, pos
, SWITCH_TYPE_PASSED
,
853 save_decoded_options
[j
].orig_option_with_args_text
);
857 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
859 /* Print the -f and -m options that have been enabled.
860 We don't handle language specific options but printing argv
862 pos
= print_single_switch (print_fn
, 0,
863 SWITCH_TYPE_DESCRIPTIVE
, _("options enabled: "));
865 for (j
= 0; j
< cl_options_count
; j
++)
866 if (cl_options
[j
].cl_report
867 && option_enabled (j
, &global_options
) > 0)
868 pos
= print_single_switch (print_fn
, pos
,
869 SWITCH_TYPE_ENABLED
, cl_options
[j
].opt_text
);
871 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
874 /* Open assembly code output file. Do this even if -fsyntax-only is
875 on, because then the driver will have provided the name of a
876 temporary file or bit bucket for us. NAME is the file specified on
877 the command line, possibly NULL. */
879 init_asm_output (const char *name
)
881 if (name
== NULL
&& asm_file_name
== 0)
882 asm_out_file
= stdout
;
885 if (asm_file_name
== 0)
887 int len
= strlen (dump_base_name
);
888 char *dumpname
= XNEWVEC (char, len
+ 6);
890 memcpy (dumpname
, dump_base_name
, len
+ 1);
891 strip_off_ending (dumpname
, len
);
892 strcat (dumpname
, ".s");
893 asm_file_name
= dumpname
;
895 if (!strcmp (asm_file_name
, "-"))
896 asm_out_file
= stdout
;
898 asm_out_file
= fopen (asm_file_name
, "w+b");
899 if (asm_out_file
== 0)
900 fatal_error ("can%'t open %s for writing: %m", asm_file_name
);
903 if (!flag_syntax_only
)
905 targetm
.asm_out
.file_start ();
907 if (flag_record_gcc_switches
)
909 if (targetm
.asm_out
.record_gcc_switches
)
911 /* Let the target know that we are about to start recording. */
912 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
914 /* Now record the switches. */
915 print_switch_values (targetm
.asm_out
.record_gcc_switches
);
916 /* Let the target know that the recording is over. */
917 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
921 inform (input_location
, "-frecord-gcc-switches is not supported by the current target");
924 #ifdef ASM_COMMENT_START
925 if (flag_verbose_asm
)
927 /* Print the list of switches in effect
928 into the assembler file as comments. */
929 print_version (asm_out_file
, ASM_COMMENT_START
);
930 print_switch_values (print_to_asm_out_file
);
931 putc ('\n', asm_out_file
);
937 /* Default tree printer. Handles declarations only. */
939 default_tree_printer (pretty_printer
*pp
, text_info
*text
, const char *spec
,
940 int precision
, bool wide
, bool set_locus
, bool hash
)
944 /* FUTURE: %+x should set the locus. */
945 if (precision
!= 0 || wide
|| hash
)
951 t
= va_arg (*text
->args_ptr
, tree
);
952 if (TREE_CODE (t
) == IDENTIFIER_NODE
)
954 pp_identifier (pp
, IDENTIFIER_POINTER (t
));
960 t
= va_arg (*text
->args_ptr
, tree
);
961 if (DECL_DEBUG_EXPR_IS_FROM (t
) && DECL_DEBUG_EXPR (t
))
962 t
= DECL_DEBUG_EXPR (t
);
967 t
= va_arg (*text
->args_ptr
, tree
);
971 percent_K_format (text
);
978 if (set_locus
&& text
->locus
)
979 *text
->locus
= DECL_SOURCE_LOCATION (t
);
983 const char *n
= DECL_NAME (t
)
984 ? identifier_to_locale (lang_hooks
.decl_printable_name (t
, 2))
989 dump_generic_node (pp
, t
, 0, TDF_DIAGNOSTIC
, 0);
994 /* A helper function; used as the reallocator function for cpp's line
997 realloc_for_line_map (void *ptr
, size_t len
)
999 return GGC_RESIZEVAR (void, ptr
, len
);
1002 /* A helper function: used as the allocator function for
1003 identifier_to_locale. */
1005 alloc_for_identifier_to_locale (size_t len
)
1007 return ggc_alloc_atomic (len
);
1010 /* Output stack usage information. */
1012 output_stack_usage (void)
1014 static bool warning_issued
= false;
1015 enum stack_usage_kind_type
{ STATIC
= 0, DYNAMIC
, DYNAMIC_BOUNDED
};
1016 const char *stack_usage_kind_str
[] = {
1021 HOST_WIDE_INT stack_usage
= current_function_static_stack_size
;
1022 enum stack_usage_kind_type stack_usage_kind
;
1024 if (stack_usage
< 0)
1026 if (!warning_issued
)
1028 warning (0, "stack usage computation not supported for this target");
1029 warning_issued
= true;
1034 stack_usage_kind
= STATIC
;
1036 /* Add the maximum amount of space pushed onto the stack. */
1037 if (current_function_pushed_stack_size
> 0)
1039 stack_usage
+= current_function_pushed_stack_size
;
1040 stack_usage_kind
= DYNAMIC_BOUNDED
;
1043 /* Now on to the tricky part: dynamic stack allocation. */
1044 if (current_function_allocates_dynamic_stack_space
)
1046 if (current_function_has_unbounded_dynamic_stack_size
)
1047 stack_usage_kind
= DYNAMIC
;
1049 stack_usage_kind
= DYNAMIC_BOUNDED
;
1051 /* Add the size even in the unbounded case, this can't hurt. */
1052 stack_usage
+= current_function_dynamic_stack_size
;
1055 if (flag_stack_usage
)
1057 expanded_location loc
1058 = expand_location (DECL_SOURCE_LOCATION (current_function_decl
));
1059 const char *raw_id
, *id
;
1061 /* Strip the scope prefix if any. */
1062 raw_id
= lang_hooks
.decl_printable_name (current_function_decl
, 2);
1063 id
= strrchr (raw_id
, '.');
1069 fprintf (stack_usage_file
,
1070 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC
"\t%s\n",
1071 lbasename (loc
.file
),
1076 stack_usage_kind_str
[stack_usage_kind
]);
1079 if (warn_stack_usage
>= 0)
1081 if (stack_usage_kind
== DYNAMIC
)
1082 warning (OPT_Wstack_usage_
, "stack usage might be unbounded");
1083 else if (stack_usage
> warn_stack_usage
)
1085 if (stack_usage_kind
== DYNAMIC_BOUNDED
)
1086 warning (OPT_Wstack_usage_
, "stack usage might be %wd bytes",
1089 warning (OPT_Wstack_usage_
, "stack usage is %wd bytes",
1095 /* Open an auxiliary output file. */
1097 open_auxiliary_file (const char *ext
)
1102 filename
= concat (aux_base_name
, ".", ext
, NULL
);
1103 file
= fopen (filename
, "w");
1105 fatal_error ("can%'t open %s for writing: %m", filename
);
1110 /* Initialization of the front end environment, before command line
1111 options are parsed. Signal handlers, internationalization etc.
1112 ARGV0 is main's argv[0]. */
1114 general_init (const char *argv0
)
1118 p
= argv0
+ strlen (argv0
);
1119 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
1123 xmalloc_set_program_name (progname
);
1127 /* Unlock the stdio streams. */
1128 unlock_std_streams ();
1130 gcc_init_libintl ();
1132 identifier_to_locale_alloc
= alloc_for_identifier_to_locale
;
1133 identifier_to_locale_free
= ggc_free
;
1135 /* Initialize the diagnostics reporting machinery, so option parsing
1136 can give warnings and errors. */
1137 diagnostic_initialize (global_dc
, N_OPTS
);
1138 diagnostic_starter (global_dc
) = default_tree_diagnostic_starter
;
1139 /* Set a default printer. Language specific initializations will
1140 override it later. */
1141 pp_format_decoder (global_dc
->printer
) = &default_tree_printer
;
1142 global_dc
->show_option_requested
1143 = global_options_init
.x_flag_diagnostics_show_option
;
1144 global_dc
->show_column
1145 = global_options_init
.x_flag_show_column
;
1146 global_dc
->internal_error
= plugins_internal_error_function
;
1147 global_dc
->option_enabled
= option_enabled
;
1148 global_dc
->option_state
= &global_options
;
1149 global_dc
->option_name
= option_name
;
1151 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1153 signal (SIGSEGV
, crash_signal
);
1156 signal (SIGILL
, crash_signal
);
1159 signal (SIGBUS
, crash_signal
);
1162 signal (SIGABRT
, crash_signal
);
1164 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1165 signal (SIGIOT
, crash_signal
);
1168 signal (SIGFPE
, crash_signal
);
1171 /* Other host-specific signal setup. */
1172 (*host_hooks
.extra_signals
)();
1174 /* Initialize the garbage-collector, string pools and tree type hash
1178 line_table
= ggc_alloc_line_maps ();
1179 linemap_init (line_table
);
1180 line_table
->reallocator
= realloc_for_line_map
;
1183 /* Initialize register usage now so switches may override. */
1186 /* Register the language-independent parameters. */
1187 global_init_params ();
1189 /* This must be done after global_init_params but before argument
1191 init_ggc_heuristics();
1192 init_optimization_passes ();
1193 statistics_early_init ();
1197 /* Return true if the current target supports -fsection-anchors. */
1200 target_supports_section_anchors_p (void)
1202 if (targetm
.min_anchor_offset
== 0 && targetm
.max_anchor_offset
== 0)
1205 if (targetm
.asm_out
.output_anchor
== NULL
)
1211 /* Default the align_* variables to 1 if they're still unset, and
1212 set up the align_*_log variables. */
1214 init_alignments (void)
1216 if (align_loops
<= 0)
1218 if (align_loops_max_skip
> align_loops
)
1219 align_loops_max_skip
= align_loops
- 1;
1220 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
1221 if (align_jumps
<= 0)
1223 if (align_jumps_max_skip
> align_jumps
)
1224 align_jumps_max_skip
= align_jumps
- 1;
1225 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
1226 if (align_labels
<= 0)
1228 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
1229 if (align_labels_max_skip
> align_labels
)
1230 align_labels_max_skip
= align_labels
- 1;
1231 if (align_functions
<= 0)
1232 align_functions
= 1;
1233 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
1236 /* Process the options that have been parsed. */
1238 process_options (void)
1240 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1241 This can happen with incorrect pre-processed input. */
1242 debug_hooks
= &do_nothing_debug_hooks
;
1244 maximum_field_alignment
= initial_max_fld_align
* BITS_PER_UNIT
;
1246 /* Allow the front end to perform consistency checks and do further
1247 initialization based on the command line options. This hook also
1248 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1249 so we can correctly initialize debug output. */
1250 no_backend
= lang_hooks
.post_options (&main_input_filename
);
1252 /* Some machines may reject certain combinations of options. */
1253 targetm
.target_option
.override ();
1255 /* Avoid any informative notes in the second run of -fcompare-debug. */
1256 if (flag_compare_debug
)
1257 diagnostic_inhibit_notes (global_dc
);
1259 if (flag_section_anchors
&& !target_supports_section_anchors_p ())
1261 warning (OPT_fsection_anchors
,
1262 "this target does not support %qs", "-fsection-anchors");
1263 flag_section_anchors
= 0;
1266 if (flag_short_enums
== 2)
1267 flag_short_enums
= targetm
.default_short_enums ();
1269 /* Set aux_base_name if not already set. */
1272 else if (main_input_filename
)
1274 char *name
= xstrdup (lbasename (main_input_filename
));
1276 strip_off_ending (name
, strlen (name
));
1277 aux_base_name
= name
;
1280 aux_base_name
= "gccaux";
1284 || flag_graphite_identity
1286 || flag_loop_flatten
1287 || flag_loop_interchange
1288 || flag_loop_strip_mine
1289 || flag_loop_parallelize_all
)
1290 sorry ("Graphite loop optimizations cannot be used (-fgraphite, "
1291 "-fgraphite-identity, -floop-block, -floop-flatten, "
1292 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1293 "and -ftree-loop-linear)");
1296 /* Unrolling all loops implies that standard loop unrolling must also
1298 if (flag_unroll_all_loops
)
1299 flag_unroll_loops
= 1;
1301 /* web and rename-registers help when run after loop unrolling. */
1302 if (flag_web
== AUTODETECT_VALUE
)
1303 flag_web
= flag_unroll_loops
|| flag_peel_loops
;
1305 if (flag_rename_registers
== AUTODETECT_VALUE
)
1306 flag_rename_registers
= flag_unroll_loops
|| flag_peel_loops
;
1308 if (flag_non_call_exceptions
)
1309 flag_asynchronous_unwind_tables
= 1;
1310 if (flag_asynchronous_unwind_tables
)
1311 flag_unwind_tables
= 1;
1313 if (flag_value_profile_transformations
)
1314 flag_profile_values
= 1;
1316 /* Warn about options that are not supported on this machine. */
1317 #ifndef INSN_SCHEDULING
1318 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
1319 warning (0, "instruction scheduling not supported on this target machine");
1322 if (flag_delayed_branch
)
1323 warning (0, "this target machine does not have delayed branches");
1326 user_label_prefix
= USER_LABEL_PREFIX
;
1327 if (flag_leading_underscore
!= -1)
1329 /* If the default prefix is more complicated than "" or "_",
1330 issue a warning and ignore this option. */
1331 if (user_label_prefix
[0] == 0 ||
1332 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
1334 user_label_prefix
= flag_leading_underscore
? "_" : "";
1337 warning (0, "-f%sleading-underscore not supported on this target machine",
1338 flag_leading_underscore
? "" : "no-");
1341 /* If we are in verbose mode, write out the version and maybe all the
1342 option flags in use. */
1345 print_version (stderr
, "");
1347 print_switch_values (print_to_stderr
);
1350 if (flag_syntax_only
)
1352 write_symbols
= NO_DEBUG
;
1358 if (debug_info_level
== DINFO_LEVEL_NONE
)
1360 debug_info_level
= DINFO_LEVEL_NORMAL
;
1362 if (write_symbols
== NO_DEBUG
)
1363 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
1366 debug_info_level
= DINFO_LEVEL_NONE
;
1369 if (flag_dump_final_insns
&& !flag_syntax_only
&& !no_backend
)
1371 FILE *final_output
= fopen (flag_dump_final_insns
, "w");
1374 error ("could not open final insn dump file %qs: %m",
1375 flag_dump_final_insns
);
1376 flag_dump_final_insns
= NULL
;
1378 else if (fclose (final_output
))
1380 error ("could not close zeroed insn dump file %qs: %m",
1381 flag_dump_final_insns
);
1382 flag_dump_final_insns
= NULL
;
1386 /* Unless over-ridden for the target, assume that all DWARF levels
1387 may be emitted, if DWARF2_DEBUG is selected. */
1388 if (dwarf_strict
< 0)
1391 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1393 if (debug_info_level
== DINFO_LEVEL_NONE
)
1394 write_symbols
= NO_DEBUG
;
1396 if (write_symbols
== NO_DEBUG
)
1398 #if defined(DBX_DEBUGGING_INFO)
1399 else if (write_symbols
== DBX_DEBUG
)
1400 debug_hooks
= &dbx_debug_hooks
;
1402 #if defined(XCOFF_DEBUGGING_INFO)
1403 else if (write_symbols
== XCOFF_DEBUG
)
1404 debug_hooks
= &xcoff_debug_hooks
;
1406 #ifdef SDB_DEBUGGING_INFO
1407 else if (write_symbols
== SDB_DEBUG
)
1408 debug_hooks
= &sdb_debug_hooks
;
1410 #ifdef DWARF2_DEBUGGING_INFO
1411 else if (write_symbols
== DWARF2_DEBUG
)
1412 debug_hooks
= &dwarf2_debug_hooks
;
1414 #ifdef VMS_DEBUGGING_INFO
1415 else if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1416 debug_hooks
= &vmsdbg_debug_hooks
;
1419 error ("target system does not support the \"%s\" debug format",
1420 debug_type_names
[write_symbols
]);
1422 /* We know which debug output will be used so we can set flag_var_tracking
1423 and flag_var_tracking_uninit if the user has not specified them. */
1424 if (debug_info_level
< DINFO_LEVEL_NORMAL
1425 || debug_hooks
->var_location
== do_nothing_debug_hooks
.var_location
)
1427 if (flag_var_tracking
== 1
1428 || flag_var_tracking_uninit
== 1)
1430 if (debug_info_level
< DINFO_LEVEL_NORMAL
)
1431 warning (0, "variable tracking requested, but useless unless "
1432 "producing debug info");
1434 warning (0, "variable tracking requested, but not supported "
1435 "by this debug format");
1437 flag_var_tracking
= 0;
1438 flag_var_tracking_uninit
= 0;
1441 /* The debug hooks are used to implement -fdump-go-spec because it
1442 gives a simple and stable API for all the information we need to
1444 if (flag_dump_go_spec
!= NULL
)
1445 debug_hooks
= dump_go_spec_init (flag_dump_go_spec
, debug_hooks
);
1447 /* If the user specifically requested variable tracking with tagging
1448 uninitialized variables, we need to turn on variable tracking.
1449 (We already determined above that variable tracking is feasible.) */
1450 if (flag_var_tracking_uninit
)
1451 flag_var_tracking
= 1;
1453 if (flag_var_tracking
== AUTODETECT_VALUE
)
1454 flag_var_tracking
= optimize
>= 1;
1456 if (flag_var_tracking_assignments
== AUTODETECT_VALUE
)
1457 flag_var_tracking_assignments
= flag_var_tracking
1458 && !(flag_selective_scheduling
|| flag_selective_scheduling2
);
1460 if (flag_var_tracking_assignments_toggle
)
1461 flag_var_tracking_assignments
= !flag_var_tracking_assignments
;
1463 if (flag_var_tracking_assignments
&& !flag_var_tracking
)
1464 flag_var_tracking
= flag_var_tracking_assignments
= -1;
1466 if (flag_var_tracking_assignments
1467 && (flag_selective_scheduling
|| flag_selective_scheduling2
))
1468 warning (0, "var-tracking-assignments changes selective scheduling");
1470 if (flag_tree_cselim
== AUTODETECT_VALUE
)
1471 #ifdef HAVE_conditional_move
1472 flag_tree_cselim
= 1;
1474 flag_tree_cselim
= 0;
1477 /* If auxiliary info generation is desired, open the output file.
1478 This goes in the same directory as the source file--unlike
1479 all the other output files. */
1480 if (flag_gen_aux_info
)
1482 aux_info_file
= fopen (aux_info_file_name
, "w");
1483 if (aux_info_file
== 0)
1484 fatal_error ("can%'t open %s: %m", aux_info_file_name
);
1487 if (!targetm_common
.have_named_sections
)
1489 if (flag_function_sections
)
1491 warning (0, "-ffunction-sections not supported for this target");
1492 flag_function_sections
= 0;
1494 if (flag_data_sections
)
1496 warning (0, "-fdata-sections not supported for this target");
1497 flag_data_sections
= 0;
1501 if (flag_function_sections
&& profile_flag
)
1503 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
1504 flag_function_sections
= 0;
1507 #ifndef HAVE_prefetch
1508 if (flag_prefetch_loop_arrays
> 0)
1510 warning (0, "-fprefetch-loop-arrays not supported for this target");
1511 flag_prefetch_loop_arrays
= 0;
1514 if (flag_prefetch_loop_arrays
> 0 && !HAVE_prefetch
)
1516 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1517 flag_prefetch_loop_arrays
= 0;
1521 /* This combination of options isn't handled for i386 targets and doesn't
1522 make much sense anyway, so don't allow it. */
1523 if (flag_prefetch_loop_arrays
> 0 && optimize_size
)
1525 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1526 flag_prefetch_loop_arrays
= 0;
1529 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1530 if (flag_signaling_nans
)
1531 flag_trapping_math
= 1;
1533 /* We cannot reassociate if we want traps or signed zeros. */
1534 if (flag_associative_math
&& (flag_trapping_math
|| flag_signed_zeros
))
1536 warning (0, "-fassociative-math disabled; other options take precedence");
1537 flag_associative_math
= 0;
1540 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1541 if (flag_cx_limited_range
)
1542 flag_complex_method
= 0;
1544 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1545 if (flag_cx_fortran_rules
)
1546 flag_complex_method
= 1;
1548 /* Targets must be able to place spill slots at lower addresses. If the
1549 target already uses a soft frame pointer, the transition is trivial. */
1550 if (!FRAME_GROWS_DOWNWARD
&& flag_stack_protect
)
1552 warning (0, "-fstack-protector not supported for this target");
1553 flag_stack_protect
= 0;
1555 if (!flag_stack_protect
)
1556 warn_stack_protect
= 0;
1558 /* ??? Unwind info is not correct around the CFG unless either a frame
1559 pointer is present or A_O_A is set. Fixing this requires rewriting
1560 unwind info generation to be aware of the CFG and propagating states
1562 if (flag_unwind_tables
&& !ACCUMULATE_OUTGOING_ARGS
1563 && flag_omit_frame_pointer
)
1565 warning (0, "unwind tables currently require a frame pointer "
1567 flag_omit_frame_pointer
= 0;
1570 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1571 have not been set. */
1572 if (!global_options_set
.x_warnings_are_errors
1573 && warn_coverage_mismatch
1574 && (global_dc
->classify_diagnostic
[OPT_Wcoverage_mismatch
] ==
1576 diagnostic_classify_diagnostic (global_dc
, OPT_Wcoverage_mismatch
,
1577 DK_ERROR
, UNKNOWN_LOCATION
);
1579 /* Save the current optimization options. */
1580 optimization_default_node
= build_optimization_node ();
1581 optimization_current_node
= optimization_default_node
;
1584 /* This function can be called multiple times to reinitialize the compiler
1585 back end when register classes or instruction sets have changed,
1586 before each function. */
1588 backend_init_target (void)
1590 /* Initialize alignment variables. */
1593 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
1594 to initialize reg_raw_mode[]. */
1597 /* This invokes target hooks to set fixed_reg[] etc, which is
1601 /* This depends on stack_pointer_rtx. */
1602 init_fake_stack_mems ();
1604 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1606 init_alias_target ();
1608 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1611 /* The following initialization functions need to generate rtl, so
1612 provide a dummy function context for them. */
1613 init_dummy_function_start ();
1615 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1616 on a mode change. */
1619 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1620 after a mode change as well. */
1621 caller_save_initialized_p
= false;
1623 expand_dummy_function_end ();
1626 /* Initialize the compiler back end. This function is called only once,
1627 when starting the compiler. */
1634 init_inline_once ();
1635 init_varasm_once ();
1636 save_register_info ();
1638 /* Initialize the target-specific back end pieces. */
1640 backend_init_target ();
1643 /* Initialize excess precision settings. */
1645 init_excess_precision (void)
1647 /* Adjust excess precision handling based on the target options. If
1648 the front end cannot handle it, flag_excess_precision_cmdline
1649 will already have been set accordingly in the post_options
1651 gcc_assert (flag_excess_precision_cmdline
!= EXCESS_PRECISION_DEFAULT
);
1652 flag_excess_precision
= flag_excess_precision_cmdline
;
1653 if (flag_unsafe_math_optimizations
)
1654 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1655 if (flag_excess_precision
== EXCESS_PRECISION_STANDARD
)
1657 int flt_eval_method
= TARGET_FLT_EVAL_METHOD
;
1658 switch (flt_eval_method
)
1662 /* Either the target acts unpredictably (-1) or has all the
1663 operations required not to have excess precision (0). */
1664 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1668 /* In these cases, predictable excess precision makes
1672 /* Any other implementation-defined FLT_EVAL_METHOD values
1673 require the compiler to handle the associated excess
1674 precision rules in excess_precision_type. */
1680 /* Initialize things that are both lang-dependent and target-dependent.
1681 This function can be called more than once if target parameters change. */
1683 lang_dependent_init_target (void)
1685 /* This determines excess precision settings. */
1686 init_excess_precision ();
1688 /* This creates various _DECL nodes, so needs to be called after the
1689 front end is initialized. It also depends on the HAVE_xxx macros
1690 generated from the target machine description. */
1693 /* The following initialization functions need to generate rtl, so
1694 provide a dummy function context for them. */
1695 init_dummy_function_start ();
1697 /* Do the target-specific parts of expr initialization. */
1698 init_expr_target ();
1700 /* Although the actions of these functions are language-independent,
1701 they use optabs, so we cannot call them from backend_init. */
1705 expand_dummy_function_end ();
1708 /* Language-dependent initialization. Returns nonzero on success. */
1710 lang_dependent_init (const char *name
)
1712 location_t save_loc
= input_location
;
1713 if (dump_base_name
== 0)
1714 dump_base_name
= name
&& name
[0] ? name
: "gccdump";
1716 /* Other front-end initialization. */
1717 input_location
= BUILTINS_LOCATION
;
1718 if (lang_hooks
.init () == 0)
1720 input_location
= save_loc
;
1724 init_asm_output (name
);
1726 /* If stack usage information is desired, open the output file. */
1727 if (flag_stack_usage
)
1728 stack_usage_file
= open_auxiliary_file ("su");
1731 /* This creates various _DECL nodes, so needs to be called after the
1732 front end is initialized. */
1735 /* Do the target-specific parts of the initialization. */
1736 lang_dependent_init_target ();
1740 /* If dbx symbol table desired, initialize writing it and output the
1741 predefined types. */
1742 timevar_push (TV_SYMOUT
);
1744 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
1745 if (dwarf2out_do_frame ())
1746 dwarf2out_frame_init ();
1749 /* Now we have the correct original filename, we can initialize
1751 (*debug_hooks
->init
) (name
);
1753 timevar_pop (TV_SYMOUT
);
1760 /* Reinitialize everything when target parameters, such as register usage,
1763 target_reinit (void)
1765 struct rtl_data saved_x_rtl
;
1766 rtx
*saved_regno_reg_rtx
;
1768 /* Save *crtl and regno_reg_rtx around the reinitialization
1769 to allow target_reinit being called even after prepare_function_start. */
1770 saved_regno_reg_rtx
= regno_reg_rtx
;
1771 if (saved_regno_reg_rtx
)
1773 saved_x_rtl
= *crtl
;
1774 memset (crtl
, '\0', sizeof (*crtl
));
1775 regno_reg_rtx
= NULL
;
1778 /* Reinitialize RTL backend. */
1779 backend_init_target ();
1781 /* Reinitialize lang-dependent parts. */
1782 lang_dependent_init_target ();
1784 /* And restore it at the end, as free_after_compilation from
1785 expand_dummy_function_end clears it. */
1786 if (saved_regno_reg_rtx
)
1788 *crtl
= saved_x_rtl
;
1789 regno_reg_rtx
= saved_regno_reg_rtx
;
1790 saved_regno_reg_rtx
= NULL
;
1795 dump_memory_report (bool final
)
1797 ggc_print_statistics ();
1798 stringpool_statistics ();
1799 dump_tree_statistics ();
1800 dump_gimple_statistics ();
1801 dump_rtx_statistics ();
1802 dump_alloc_pool_statistics ();
1803 dump_bitmap_statistics ();
1804 dump_vec_loc_statistics ();
1805 dump_ggc_loc_statistics (final
);
1806 dump_alias_stats (stderr
);
1807 dump_pta_stats (stderr
);
1810 /* Clean up: close opened files, etc. */
1813 finalize (bool no_backend
)
1815 /* Close the dump files. */
1816 if (flag_gen_aux_info
)
1818 fclose (aux_info_file
);
1820 unlink (aux_info_file_name
);
1823 /* Close non-debugging input and output files. Take special care to note
1824 whether fclose returns an error, since the pages might still be on the
1825 buffer chain while the file is open. */
1829 if (ferror (asm_out_file
) != 0)
1830 fatal_error ("error writing to %s: %m", asm_file_name
);
1831 if (fclose (asm_out_file
) != 0)
1832 fatal_error ("error closing %s: %m", asm_file_name
);
1835 if (stack_usage_file
)
1836 fclose (stack_usage_file
);
1842 finish_optimization_passes ();
1848 dump_memory_report (true);
1850 /* Language-specific end of compilation actions. */
1851 lang_hooks
.finish ();
1854 /* Initialize the compiler, and compile the input file. */
1858 /* Initialize timing first. The C front ends read the main file in
1859 the post_options hook, and C++ does file timings. */
1860 if (time_report
|| !quiet_flag
|| flag_detailed_statistics
)
1862 timevar_start (TV_TOTAL
);
1866 /* Don't do any more if an error has already occurred. */
1869 timevar_start (TV_PHASE_SETUP
);
1871 /* This must be run always, because it is needed to compute the FP
1872 predefined macros, such as __LDBL_MAX__, for targets using non
1873 default FP formats. */
1874 init_adjust_machine_modes ();
1876 /* Set up the back-end if requested. */
1880 /* Language-dependent initialization. Returns true on success. */
1881 if (lang_dependent_init (main_input_filename
))
1883 /* Initialize yet another pass. */
1885 ggc_protect_identifiers
= true;
1888 init_final (main_input_filename
);
1889 coverage_init (aux_base_name
);
1891 invoke_plugin_callbacks (PLUGIN_START_UNIT
, NULL
);
1893 timevar_stop (TV_PHASE_SETUP
);
1899 timevar_stop (TV_PHASE_SETUP
);
1902 timevar_start (TV_PHASE_FINALIZE
);
1904 finalize (no_backend
);
1906 timevar_stop (TV_PHASE_FINALIZE
);
1909 /* Stop timing and print the times. */
1910 timevar_stop (TV_TOTAL
);
1911 timevar_print (stderr
);
1914 /* Entry point of cc1, cc1plus, jc1, f771, etc.
1915 Exit code is FATAL_EXIT_CODE if can't open files or if there were
1916 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
1918 It is not safe to call this function more than once. */
1921 toplev_main (int argc
, char **argv
)
1923 expandargv (&argc
, &argv
);
1925 /* Initialization of GCC's environment, and diagnostics. */
1926 general_init (argv
[0]);
1928 /* One-off initialization of options that does not need to be
1929 repeated when options are added for particular functions. */
1930 init_options_once ();
1932 /* Initialize global options structures; this must be repeated for
1933 each structure used for parsing options. */
1934 init_options_struct (&global_options
, &global_options_set
);
1935 lang_hooks
.init_options_struct (&global_options
);
1937 /* Convert the options to an array. */
1938 decode_cmdline_options_to_array_default_mask (argc
,
1939 CONST_CAST2 (const char **,
1941 &save_decoded_options
,
1942 &save_decoded_options_count
);
1944 /* Perform language-specific options initialization. */
1945 lang_hooks
.init_options (save_decoded_options_count
, save_decoded_options
);
1947 /* Parse the options and do minimal processing; basically just
1948 enough to default flags appropriately. */
1949 decode_options (&global_options
, &global_options_set
,
1950 save_decoded_options
, save_decoded_options_count
,
1951 UNKNOWN_LOCATION
, global_dc
);
1953 handle_common_deferred_options ();
1957 initialize_plugins ();
1960 print_version (stderr
, "");
1963 print_plugins_help (stderr
, "");
1965 /* Exit early if we can (e.g. -help). */
1966 if (!exit_after_options
)
1969 if (warningcount
|| errorcount
)
1970 print_ignored_options ();
1971 diagnostic_finish (global_dc
);
1973 /* Invoke registered plugin callbacks if any. */
1974 invoke_plugin_callbacks (PLUGIN_FINISH
, NULL
);
1976 finalize_plugins ();
1978 return (FATAL_EXIT_CODE
);
1980 return (SUCCESS_EXIT_CODE
);