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. */
144 /* Random number for this compilation */
145 HOST_WIDE_INT random_seed
;
149 /* Nonzero means make permerror produce warnings instead of errors. */
151 int flag_permissive
= 0;
153 /* When non-NULL, indicates that whenever space is allocated on the
154 stack, the resulting stack pointer must not pass this
155 address---that is, for stacks that grow downward, the stack pointer
156 must always be greater than or equal to this address; for stacks
157 that grow upward, the stack pointer must be less than this address.
158 At present, the rtx may be either a REG or a SYMBOL_REF, although
159 the support provided depends on the backend. */
162 /* True if the user has tagged the function with the 'section'
165 bool user_defined_section_attribute
= false;
167 struct target_flag_state default_target_flag_state
;
168 #if SWITCHABLE_TARGET
169 struct target_flag_state
*this_target_flag_state
= &default_target_flag_state
;
171 #define this_target_flag_state (&default_target_flag_state)
174 /* The user symbol prefix after having resolved same. */
175 const char *user_label_prefix
;
177 /* Output files for assembler code (real compiler output)
178 and debugging dumps. */
182 FILE *stack_usage_file
= NULL
;
183 FILE *dump_file
= NULL
;
184 const char *dump_file_name
;
186 /* The current working directory of a translation. It's generally the
187 directory from which compilation was initiated, but a preprocessed
188 file may specify the original directory in which it was
191 static const char *src_pwd
;
193 /* Initialize src_pwd with the given string, and return true. If it
194 was already initialized, return false. As a special case, it may
195 be called with a NULL argument to test whether src_pwd has NOT been
199 set_src_pwd (const char *pwd
)
203 if (strcmp (src_pwd
, pwd
) == 0)
209 src_pwd
= xstrdup (pwd
);
213 /* Return the directory from which the translation unit was initiated,
214 in case set_src_pwd() was not called before to assign it a
230 /* Called when the start of a function definition is parsed,
231 this function prints on stderr the name of the function. */
233 announce_function (tree decl
)
237 if (rtl_dump_and_exit
)
238 fprintf (stderr
, "%s ",
239 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl
))));
241 fprintf (stderr
, " %s",
242 identifier_to_locale (lang_hooks
.decl_printable_name (decl
, 2)));
244 pp_needs_newline (global_dc
->printer
) = true;
245 diagnostic_set_last_function (global_dc
, (diagnostic_info
*) NULL
);
249 /* Initialize local_tick with a random number or -1 if
250 flag_random_seed is set. */
253 init_local_tick (void)
255 if (!flag_random_seed
)
257 /* Try urandom first. Time of day is too likely to collide.
258 In case of any error we just use the local tick. */
260 int fd
= open ("/dev/urandom", O_RDONLY
);
263 read (fd
, &random_seed
, sizeof (random_seed
));
267 /* Now get the tick anyways */
268 #ifdef HAVE_GETTIMEOFDAY
272 gettimeofday (&tv
, NULL
);
273 local_tick
= tv
.tv_sec
* 1000 + tv
.tv_usec
/ 1000;
277 time_t now
= time (NULL
);
279 if (now
!= (time_t)-1)
280 local_tick
= (unsigned) now
;
288 /* Set up a default flag_random_seed and local_tick, unless the user
289 already specified one. Must be called after init_local_tick. */
292 init_random_seed (void)
294 if (flag_random_seed
)
298 /* When the driver passed in a hex number don't crc it again */
299 random_seed
= strtoul (flag_random_seed
, &endp
, 0);
300 if (!(endp
> flag_random_seed
&& *endp
== 0))
301 random_seed
= crc32_string (0, flag_random_seed
);
303 else if (!random_seed
)
304 random_seed
= local_tick
^ getpid (); /* Old racey fallback method */
307 /* Obtain the random_seed. Unless NOINIT, initialize it if
308 it's not provided in the command line. */
311 get_random_seed (bool noinit
)
313 if (!flag_random_seed
&& !noinit
)
318 /* Modify the random_seed string to VAL. Return its previous
322 set_random_seed (const char *val
)
324 const char *old
= flag_random_seed
;
325 flag_random_seed
= val
;
329 /* Handler for fatal signals, such as SIGSEGV. These are transformed
330 into ICE messages, which is much more user friendly. In case the
331 error printer crashes, reset the signal to prevent infinite recursion. */
334 crash_signal (int signo
)
336 signal (signo
, SIG_DFL
);
338 /* If we crashed while processing an ASM statement, then be a little more
339 graceful. It's most likely the user's fault. */
340 if (this_is_asm_operands
)
342 output_operand_lossage ("unrecoverable error");
343 exit (FATAL_EXIT_CODE
);
346 internal_error ("%s", strsignal (signo
));
349 /* A subroutine of wrapup_global_declarations. We've come to the end of
350 the compilation unit. All deferred variables should be undeferred,
351 and all incomplete decls should be finalized. */
354 wrapup_global_declaration_1 (tree decl
)
356 /* We're not deferring this any longer. Assignment is conditional to
357 avoid needlessly dirtying PCH pages. */
358 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl
), TS_DECL_WITH_VIS
)
359 && DECL_DEFER_OUTPUT (decl
) != 0)
360 DECL_DEFER_OUTPUT (decl
) = 0;
362 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0)
363 lang_hooks
.finish_incomplete_decl (decl
);
366 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
367 needs to be output. Return true if it is output. */
370 wrapup_global_declaration_2 (tree decl
)
372 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
375 /* Don't write out static consts, unless we still need them.
377 We also keep static consts if not optimizing (for debugging),
378 unless the user specified -fno-keep-static-consts.
379 ??? They might be better written into the debug information.
380 This is possible when using DWARF.
382 A language processor that wants static constants to be always
383 written out (even if it is not used) is responsible for
384 calling rest_of_decl_compilation itself. E.g. the C front-end
385 calls rest_of_decl_compilation from finish_decl.
386 One motivation for this is that is conventional in some
387 environments to write things like:
388 static const char rcsid[] = "... version string ...";
389 intending to force the string to be in the executable.
391 A language processor that would prefer to have unneeded
392 static constants "optimized away" would just defer writing
393 them out until here. E.g. C++ does this, because static
394 constants are often defined in header files.
396 ??? A tempting alternative (for both C and C++) would be
397 to force a constant to be written if and only if it is
398 defined in a main file, as opposed to an include file. */
400 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
402 struct varpool_node
*node
;
404 node
= varpool_get_node (decl
);
406 if (!node
&& flag_ltrans
)
408 else if (node
&& node
->finalized
)
410 else if (node
&& node
->alias
)
412 else if (!cgraph_global_info_ready
414 || TREE_USED (DECL_ASSEMBLER_NAME (decl
))))
416 else if (node
&& node
->needed
)
418 else if (DECL_COMDAT (decl
))
420 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
421 && (optimize
|| !flag_keep_static_consts
422 || DECL_ARTIFICIAL (decl
)))
427 rest_of_decl_compilation (decl
, 1, 1);
435 /* Do any final processing required for the declarations in VEC, of
436 which there are LEN. We write out inline functions and variables
437 that have been deferred until this point, but which are required.
438 Returns nonzero if anything was put out. */
441 wrapup_global_declarations (tree
*vec
, int len
)
443 bool reconsider
, output_something
= false;
446 for (i
= 0; i
< len
; i
++)
447 wrapup_global_declaration_1 (vec
[i
]);
449 /* Now emit any global variables or functions that we have been
450 putting off. We need to loop in case one of the things emitted
451 here references another one which comes earlier in the list. */
455 for (i
= 0; i
< len
; i
++)
456 reconsider
|= wrapup_global_declaration_2 (vec
[i
]);
458 output_something
= true;
462 return output_something
;
465 /* A subroutine of check_global_declarations. Issue appropriate warnings
466 for the global declaration DECL. */
469 check_global_declaration_1 (tree decl
)
471 /* Warn about any function declared static but not defined. We don't
472 warn about variables, because many programs have static variables
473 that exist only to get some text into the object file. */
474 if (TREE_CODE (decl
) == FUNCTION_DECL
475 && DECL_INITIAL (decl
) == 0
476 && DECL_EXTERNAL (decl
)
477 && ! DECL_ARTIFICIAL (decl
)
478 && ! TREE_NO_WARNING (decl
)
479 && ! TREE_PUBLIC (decl
)
480 && (warn_unused_function
481 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
483 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
484 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
486 warning (OPT_Wunused_function
, "%q+F declared %<static%> but never defined", decl
);
487 /* This symbol is effectively an "extern" declaration now. */
488 TREE_PUBLIC (decl
) = 1;
491 /* Warn about static fns or vars defined but not used. */
492 if (((warn_unused_function
&& TREE_CODE (decl
) == FUNCTION_DECL
)
493 /* We don't warn about "static const" variables because the
494 "rcs_id" idiom uses that construction. */
495 || (warn_unused_variable
496 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
497 && ! DECL_IN_SYSTEM_HEADER (decl
)
498 && ! TREE_USED (decl
)
499 /* The TREE_USED bit for file-scope decls is kept in the identifier,
500 to handle multiple external decls in different scopes. */
501 && ! (DECL_NAME (decl
) && TREE_USED (DECL_NAME (decl
)))
502 && ! DECL_EXTERNAL (decl
)
503 && ! TREE_PUBLIC (decl
)
504 /* A volatile variable might be used in some non-obvious way. */
505 && ! TREE_THIS_VOLATILE (decl
)
506 /* Global register variables must be declared to reserve them. */
507 && ! (TREE_CODE (decl
) == VAR_DECL
&& DECL_REGISTER (decl
))
508 /* Otherwise, ask the language. */
509 && lang_hooks
.decls
.warn_unused_global (decl
))
510 warning ((TREE_CODE (decl
) == FUNCTION_DECL
)
511 ? OPT_Wunused_function
512 : OPT_Wunused_variable
,
513 "%q+D defined but not used", decl
);
516 /* Issue appropriate warnings for the global declarations in VEC (of
517 which there are LEN). */
520 check_global_declarations (tree
*vec
, int len
)
524 for (i
= 0; i
< len
; i
++)
525 check_global_declaration_1 (vec
[i
]);
528 /* Emit debugging information for all global declarations in VEC. */
531 emit_debug_global_declarations (tree
*vec
, int len
)
535 /* Avoid confusing the debug information machinery when there are errors. */
539 timevar_push (TV_SYMOUT
);
540 for (i
= 0; i
< len
; i
++)
541 debug_hooks
->global_decl (vec
[i
]);
542 timevar_pop (TV_SYMOUT
);
545 /* Compile an entire translation unit. Write a file of assembly
546 output and various debugging dumps. */
551 timevar_start (TV_PHASE_PARSING
);
552 timevar_push (TV_PARSE_GLOBAL
);
554 /* Call the parser, which parses the entire file (calling
555 rest_of_compilation for each function). */
556 lang_hooks
.parse_file ();
558 timevar_pop (TV_PARSE_GLOBAL
);
559 timevar_stop (TV_PHASE_PARSING
);
561 /* Compilation is now finished except for writing
562 what's left of the symbol table output. */
564 if (flag_syntax_only
|| flag_wpa
)
567 timevar_start (TV_PHASE_GENERATE
);
569 ggc_protect_identifiers
= false;
571 /* This must also call cgraph_finalize_compilation_unit. */
572 lang_hooks
.decls
.final_write_globals ();
576 timevar_stop (TV_PHASE_GENERATE
);
580 /* Compilation unit is finalized. When producing non-fat LTO object, we are
581 basically finished. */
582 if (in_lto_p
|| !flag_lto
|| flag_fat_lto_objects
)
584 varpool_assemble_pending_decls ();
587 /* Likewise for mudflap static object registrations. */
589 mudflap_finish_file ();
591 output_shared_constant_pool ();
592 output_object_blocks ();
593 finish_tm_clone_pairs ();
595 /* Write out any pending weak symbol declarations. */
598 /* This must be at the end before unwind and debug info.
599 Some target ports emit PIC setup thunks here. */
600 targetm
.asm_out
.code_end ();
602 /* Do dbx symbols. */
603 timevar_push (TV_SYMOUT
);
605 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
606 if (dwarf2out_do_frame ())
607 dwarf2out_frame_finish ();
610 (*debug_hooks
->finish
) (main_input_filename
);
611 timevar_pop (TV_SYMOUT
);
613 /* Output some stuff at end of file if nec. */
615 dw2_output_indirect_constants ();
617 /* Flush any pending external directives. */
618 process_pending_assemble_externals ();
621 /* Emit LTO marker if LTO info has been previously emitted. This is
622 used by collect2 to determine whether an object file contains IL.
623 We used to emit an undefined reference here, but this produces
624 link errors if an object file with IL is stored into a shared
625 library without invoking lto1. */
626 if (flag_generate_lto
)
628 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
629 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
,
631 (unsigned HOST_WIDE_INT
) 1, 8);
632 #elif defined ASM_OUTPUT_ALIGNED_COMMON
633 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_v1",
634 (unsigned HOST_WIDE_INT
) 1, 8);
636 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_v1",
637 (unsigned HOST_WIDE_INT
) 1,
638 (unsigned HOST_WIDE_INT
) 1);
640 /* Let linker plugin know that this is a slim object and must be LTOed
641 even when user did not ask for it. */
642 if (!flag_fat_lto_objects
)
644 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
645 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
,
647 (unsigned HOST_WIDE_INT
) 1, 8);
648 #elif defined ASM_OUTPUT_ALIGNED_COMMON
649 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_slim",
650 (unsigned HOST_WIDE_INT
) 1, 8);
652 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_slim",
653 (unsigned HOST_WIDE_INT
) 1,
654 (unsigned HOST_WIDE_INT
) 1);
659 /* Attach a special .ident directive to the end of the file to identify
660 the version of GCC which compiled this code. The format of the .ident
661 string is patterned after the ones produced by native SVR4 compilers. */
665 const char *pkg_version
= "(GNU) ";
667 if (strcmp ("(GCC) ", pkgversion_string
))
668 pkg_version
= pkgversion_string
;
669 fprintf (asm_out_file
, "%s\"GCC: %s%s\"\n",
670 IDENT_ASM_OP
, pkg_version
, version_string
);
674 /* Invoke registered plugin callbacks. */
675 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT
, NULL
);
677 /* This must be at the end. Some target ports emit end of file directives
678 into the assembly file here, and hence we can not output anything to the
679 assembly file after this point. */
680 targetm
.asm_out
.file_end ();
682 timevar_stop (TV_PHASE_GENERATE
);
685 /* Print version information to FILE.
686 Each line begins with INDENT (for the case where FILE is the
687 assembler output file). */
690 print_version (FILE *file
, const char *indent
)
692 static const char fmt1
[] =
694 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
696 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
699 static const char fmt2
[] =
700 N_("GMP version %s, MPFR version %s, MPC version %s\n");
701 static const char fmt3
[] =
702 N_("%s%swarning: %s header version %s differs from library version %s.\n");
703 static const char fmt4
[] =
704 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
706 #define __VERSION__ "[?]"
709 file
== stderr
? _(fmt1
) : fmt1
,
710 indent
, *indent
!= 0 ? " " : "",
711 lang_hooks
.name
, pkgversion_string
, version_string
, TARGET_NAME
,
712 indent
, __VERSION__
);
714 /* We need to stringify the GMP macro values. Ugh, gmp_version has
715 two string formats, "i.j.k" and "i.j" when k is zero. As of
716 gmp-4.3.0, GMP always uses the 3 number format. */
717 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
718 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3(X)
719 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
720 #define GCC_GMP_VERSION \
721 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
722 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
723 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
724 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR)
726 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
727 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) "." \
728 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_PATCHLEVEL)
731 file
== stderr
? _(fmt2
) : fmt2
,
732 GCC_GMP_STRINGIFY_VERSION
, MPFR_VERSION_STRING
, MPC_VERSION_STRING
);
733 if (strcmp (GCC_GMP_STRINGIFY_VERSION
, gmp_version
))
735 file
== stderr
? _(fmt3
) : fmt3
,
736 indent
, *indent
!= 0 ? " " : "",
737 "GMP", GCC_GMP_STRINGIFY_VERSION
, gmp_version
);
738 if (strcmp (MPFR_VERSION_STRING
, mpfr_get_version ()))
740 file
== stderr
? _(fmt3
) : fmt3
,
741 indent
, *indent
!= 0 ? " " : "",
742 "MPFR", MPFR_VERSION_STRING
, mpfr_get_version ());
743 if (strcmp (MPC_VERSION_STRING
, mpc_get_version ()))
745 file
== stderr
? _(fmt3
) : fmt3
,
746 indent
, *indent
!= 0 ? " " : "",
747 "MPC", MPC_VERSION_STRING
, mpc_get_version ());
749 file
== stderr
? _(fmt4
) : fmt4
,
750 indent
, *indent
!= 0 ? " " : "",
751 PARAM_VALUE (GGC_MIN_EXPAND
), PARAM_VALUE (GGC_MIN_HEAPSIZE
));
753 print_plugins_versions (file
, indent
);
757 print_to_asm_out_file (print_switch_type type
, const char * text
)
759 bool prepend_sep
= true;
763 case SWITCH_TYPE_LINE_END
:
764 putc ('\n', asm_out_file
);
767 case SWITCH_TYPE_LINE_START
:
768 fputs (ASM_COMMENT_START
, asm_out_file
);
769 return strlen (ASM_COMMENT_START
);
771 case SWITCH_TYPE_DESCRIPTIVE
:
772 if (ASM_COMMENT_START
[0] == 0)
775 case SWITCH_TYPE_PASSED
:
776 case SWITCH_TYPE_ENABLED
:
778 fputc (' ', asm_out_file
);
779 fputs (text
, asm_out_file
);
780 /* No need to return the length here as
781 print_single_switch has already done it. */
790 print_to_stderr (print_switch_type type
, const char * text
)
794 case SWITCH_TYPE_LINE_END
:
798 case SWITCH_TYPE_LINE_START
:
801 case SWITCH_TYPE_PASSED
:
802 case SWITCH_TYPE_ENABLED
:
806 case SWITCH_TYPE_DESCRIPTIVE
:
807 fputs (text
, stderr
);
808 /* No need to return the length here as
809 print_single_switch has already done it. */
817 /* Print an option value and return the adjusted position in the line.
818 ??? print_fn doesn't handle errors, eg disk full; presumably other
819 code will catch a disk full though. */
822 print_single_switch (print_switch_fn_type print_fn
,
824 print_switch_type type
,
827 /* The ultrix fprintf returns 0 on success, so compute the result
828 we want here since we need it for the following test. The +1
829 is for the separator character that will probably be emitted. */
830 int len
= strlen (text
) + 1;
833 && pos
+ len
> MAX_LINE
)
835 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
840 pos
+= print_fn (SWITCH_TYPE_LINE_START
, NULL
);
842 print_fn (type
, text
);
846 /* Print active target switches using PRINT_FN.
847 POS is the current cursor position and MAX is the size of a "line".
848 Each line begins with INDENT and ends with TERM.
849 Each switch is separated from the next by SEP. */
852 print_switch_values (print_switch_fn_type print_fn
)
857 /* Fill in the -frandom-seed option, if the user didn't pass it, so
858 that it can be printed below. This helps reproducibility. */
859 if (!flag_random_seed
)
862 /* Print the options as passed. */
863 pos
= print_single_switch (print_fn
, pos
,
864 SWITCH_TYPE_DESCRIPTIVE
, _("options passed: "));
866 for (j
= 1; j
< save_decoded_options_count
; j
++)
868 switch (save_decoded_options
[j
].opt_index
)
881 pos
= print_single_switch (print_fn
, pos
, SWITCH_TYPE_PASSED
,
882 save_decoded_options
[j
].orig_option_with_args_text
);
886 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
888 /* Print the -f and -m options that have been enabled.
889 We don't handle language specific options but printing argv
891 pos
= print_single_switch (print_fn
, 0,
892 SWITCH_TYPE_DESCRIPTIVE
, _("options enabled: "));
894 for (j
= 0; j
< cl_options_count
; j
++)
895 if (cl_options
[j
].cl_report
896 && option_enabled (j
, &global_options
) > 0)
897 pos
= print_single_switch (print_fn
, pos
,
898 SWITCH_TYPE_ENABLED
, cl_options
[j
].opt_text
);
900 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
903 /* Open assembly code output file. Do this even if -fsyntax-only is
904 on, because then the driver will have provided the name of a
905 temporary file or bit bucket for us. NAME is the file specified on
906 the command line, possibly NULL. */
908 init_asm_output (const char *name
)
910 if (name
== NULL
&& asm_file_name
== 0)
911 asm_out_file
= stdout
;
914 if (asm_file_name
== 0)
916 int len
= strlen (dump_base_name
);
917 char *dumpname
= XNEWVEC (char, len
+ 6);
919 memcpy (dumpname
, dump_base_name
, len
+ 1);
920 strip_off_ending (dumpname
, len
);
921 strcat (dumpname
, ".s");
922 asm_file_name
= dumpname
;
924 if (!strcmp (asm_file_name
, "-"))
925 asm_out_file
= stdout
;
927 asm_out_file
= fopen (asm_file_name
, "w+b");
928 if (asm_out_file
== 0)
929 fatal_error ("can%'t open %s for writing: %m", asm_file_name
);
932 if (!flag_syntax_only
)
934 targetm
.asm_out
.file_start ();
936 if (flag_record_gcc_switches
)
938 if (targetm
.asm_out
.record_gcc_switches
)
940 /* Let the target know that we are about to start recording. */
941 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
943 /* Now record the switches. */
944 print_switch_values (targetm
.asm_out
.record_gcc_switches
);
945 /* Let the target know that the recording is over. */
946 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
950 inform (input_location
, "-frecord-gcc-switches is not supported by the current target");
953 if (flag_verbose_asm
)
955 /* Print the list of switches in effect
956 into the assembler file as comments. */
957 print_version (asm_out_file
, ASM_COMMENT_START
);
958 print_switch_values (print_to_asm_out_file
);
959 putc ('\n', asm_out_file
);
964 /* Default tree printer. Handles declarations only. */
966 default_tree_printer (pretty_printer
*pp
, text_info
*text
, const char *spec
,
967 int precision
, bool wide
, bool set_locus
, bool hash
)
971 /* FUTURE: %+x should set the locus. */
972 if (precision
!= 0 || wide
|| hash
)
978 t
= va_arg (*text
->args_ptr
, tree
);
979 if (TREE_CODE (t
) == IDENTIFIER_NODE
)
981 pp_identifier (pp
, IDENTIFIER_POINTER (t
));
987 t
= va_arg (*text
->args_ptr
, tree
);
988 if (DECL_DEBUG_EXPR_IS_FROM (t
) && DECL_DEBUG_EXPR (t
))
989 t
= DECL_DEBUG_EXPR (t
);
994 t
= va_arg (*text
->args_ptr
, tree
);
998 percent_K_format (text
);
1005 if (set_locus
&& text
->locus
)
1006 *text
->locus
= DECL_SOURCE_LOCATION (t
);
1010 const char *n
= DECL_NAME (t
)
1011 ? identifier_to_locale (lang_hooks
.decl_printable_name (t
, 2))
1016 dump_generic_node (pp
, t
, 0, TDF_DIAGNOSTIC
, 0);
1021 /* A helper function; used as the reallocator function for cpp's line
1024 realloc_for_line_map (void *ptr
, size_t len
)
1026 return GGC_RESIZEVAR (void, ptr
, len
);
1029 /* A helper function: used as the allocator function for
1030 identifier_to_locale. */
1032 alloc_for_identifier_to_locale (size_t len
)
1034 return ggc_alloc_atomic (len
);
1037 /* Output stack usage information. */
1039 output_stack_usage (void)
1041 static bool warning_issued
= false;
1042 enum stack_usage_kind_type
{ STATIC
= 0, DYNAMIC
, DYNAMIC_BOUNDED
};
1043 const char *stack_usage_kind_str
[] = {
1048 HOST_WIDE_INT stack_usage
= current_function_static_stack_size
;
1049 enum stack_usage_kind_type stack_usage_kind
;
1051 if (stack_usage
< 0)
1053 if (!warning_issued
)
1055 warning (0, "stack usage computation not supported for this target");
1056 warning_issued
= true;
1061 stack_usage_kind
= STATIC
;
1063 /* Add the maximum amount of space pushed onto the stack. */
1064 if (current_function_pushed_stack_size
> 0)
1066 stack_usage
+= current_function_pushed_stack_size
;
1067 stack_usage_kind
= DYNAMIC_BOUNDED
;
1070 /* Now on to the tricky part: dynamic stack allocation. */
1071 if (current_function_allocates_dynamic_stack_space
)
1073 if (current_function_has_unbounded_dynamic_stack_size
)
1074 stack_usage_kind
= DYNAMIC
;
1076 stack_usage_kind
= DYNAMIC_BOUNDED
;
1078 /* Add the size even in the unbounded case, this can't hurt. */
1079 stack_usage
+= current_function_dynamic_stack_size
;
1082 if (flag_stack_usage
)
1084 expanded_location loc
1085 = expand_location (DECL_SOURCE_LOCATION (current_function_decl
));
1086 const char *raw_id
, *id
;
1088 /* Strip the scope prefix if any. */
1089 raw_id
= lang_hooks
.decl_printable_name (current_function_decl
, 2);
1090 id
= strrchr (raw_id
, '.');
1096 fprintf (stack_usage_file
,
1097 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC
"\t%s\n",
1098 lbasename (loc
.file
),
1103 stack_usage_kind_str
[stack_usage_kind
]);
1106 if (warn_stack_usage
>= 0)
1108 if (stack_usage_kind
== DYNAMIC
)
1109 warning (OPT_Wstack_usage_
, "stack usage might be unbounded");
1110 else if (stack_usage
> warn_stack_usage
)
1112 if (stack_usage_kind
== DYNAMIC_BOUNDED
)
1113 warning (OPT_Wstack_usage_
, "stack usage might be %wd bytes",
1116 warning (OPT_Wstack_usage_
, "stack usage is %wd bytes",
1122 /* Open an auxiliary output file. */
1124 open_auxiliary_file (const char *ext
)
1129 filename
= concat (aux_base_name
, ".", ext
, NULL
);
1130 file
= fopen (filename
, "w");
1132 fatal_error ("can%'t open %s for writing: %m", filename
);
1137 /* Initialization of the front end environment, before command line
1138 options are parsed. Signal handlers, internationalization etc.
1139 ARGV0 is main's argv[0]. */
1141 general_init (const char *argv0
)
1145 p
= argv0
+ strlen (argv0
);
1146 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
1150 xmalloc_set_program_name (progname
);
1154 /* Unlock the stdio streams. */
1155 unlock_std_streams ();
1157 gcc_init_libintl ();
1159 identifier_to_locale_alloc
= alloc_for_identifier_to_locale
;
1160 identifier_to_locale_free
= ggc_free
;
1162 /* Initialize the diagnostics reporting machinery, so option parsing
1163 can give warnings and errors. */
1164 diagnostic_initialize (global_dc
, N_OPTS
);
1165 diagnostic_starter (global_dc
) = default_tree_diagnostic_starter
;
1166 /* By default print macro expansion contexts in the diagnostic
1167 finalizer -- for tokens resulting from macro macro expansion. */
1168 diagnostic_finalizer (global_dc
) = virt_loc_aware_diagnostic_finalizer
;
1169 /* Set a default printer. Language specific initializations will
1170 override it later. */
1171 pp_format_decoder (global_dc
->printer
) = &default_tree_printer
;
1172 global_dc
->show_option_requested
1173 = global_options_init
.x_flag_diagnostics_show_option
;
1174 global_dc
->show_column
1175 = global_options_init
.x_flag_show_column
;
1176 global_dc
->internal_error
= plugins_internal_error_function
;
1177 global_dc
->option_enabled
= option_enabled
;
1178 global_dc
->option_state
= &global_options
;
1179 global_dc
->option_name
= option_name
;
1181 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1183 signal (SIGSEGV
, crash_signal
);
1186 signal (SIGILL
, crash_signal
);
1189 signal (SIGBUS
, crash_signal
);
1192 signal (SIGABRT
, crash_signal
);
1194 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1195 signal (SIGIOT
, crash_signal
);
1198 signal (SIGFPE
, crash_signal
);
1201 /* Other host-specific signal setup. */
1202 (*host_hooks
.extra_signals
)();
1204 /* Initialize the garbage-collector, string pools and tree type hash
1208 line_table
= ggc_alloc_line_maps ();
1209 linemap_init (line_table
);
1210 line_table
->reallocator
= realloc_for_line_map
;
1211 line_table
->round_alloc_size
= ggc_round_alloc_size
;
1214 /* Initialize register usage now so switches may override. */
1217 /* Register the language-independent parameters. */
1218 global_init_params ();
1220 /* This must be done after global_init_params but before argument
1222 init_ggc_heuristics();
1223 init_optimization_passes ();
1224 statistics_early_init ();
1228 /* Return true if the current target supports -fsection-anchors. */
1231 target_supports_section_anchors_p (void)
1233 if (targetm
.min_anchor_offset
== 0 && targetm
.max_anchor_offset
== 0)
1236 if (targetm
.asm_out
.output_anchor
== NULL
)
1242 /* Default the align_* variables to 1 if they're still unset, and
1243 set up the align_*_log variables. */
1245 init_alignments (void)
1247 if (align_loops
<= 0)
1249 if (align_loops_max_skip
> align_loops
)
1250 align_loops_max_skip
= align_loops
- 1;
1251 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
1252 if (align_jumps
<= 0)
1254 if (align_jumps_max_skip
> align_jumps
)
1255 align_jumps_max_skip
= align_jumps
- 1;
1256 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
1257 if (align_labels
<= 0)
1259 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
1260 if (align_labels_max_skip
> align_labels
)
1261 align_labels_max_skip
= align_labels
- 1;
1262 if (align_functions
<= 0)
1263 align_functions
= 1;
1264 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
1267 /* Process the options that have been parsed. */
1269 process_options (void)
1271 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1272 This can happen with incorrect pre-processed input. */
1273 debug_hooks
= &do_nothing_debug_hooks
;
1275 maximum_field_alignment
= initial_max_fld_align
* BITS_PER_UNIT
;
1277 /* Allow the front end to perform consistency checks and do further
1278 initialization based on the command line options. This hook also
1279 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1280 so we can correctly initialize debug output. */
1281 no_backend
= lang_hooks
.post_options (&main_input_filename
);
1283 /* Some machines may reject certain combinations of options. */
1284 targetm
.target_option
.override ();
1286 /* Avoid any informative notes in the second run of -fcompare-debug. */
1287 if (flag_compare_debug
)
1288 diagnostic_inhibit_notes (global_dc
);
1290 if (flag_section_anchors
&& !target_supports_section_anchors_p ())
1292 warning (OPT_fsection_anchors
,
1293 "this target does not support %qs", "-fsection-anchors");
1294 flag_section_anchors
= 0;
1297 if (flag_short_enums
== 2)
1298 flag_short_enums
= targetm
.default_short_enums ();
1300 /* Set aux_base_name if not already set. */
1303 else if (main_input_filename
)
1305 char *name
= xstrdup (lbasename (main_input_filename
));
1307 strip_off_ending (name
, strlen (name
));
1308 aux_base_name
= name
;
1311 aux_base_name
= "gccaux";
1315 || flag_graphite_identity
1317 || flag_loop_interchange
1318 || flag_loop_strip_mine
1319 || flag_loop_parallelize_all
)
1320 sorry ("Graphite loop optimizations cannot be used (-fgraphite, "
1321 "-fgraphite-identity, -floop-block, "
1322 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1323 "and -ftree-loop-linear)");
1326 if (flag_mudflap
&& flag_lto
)
1327 sorry ("mudflap cannot be used together with link-time optimization");
1329 /* One region RA really helps to decrease the code size. */
1330 if (flag_ira_region
== IRA_REGION_AUTODETECT
)
1332 = optimize_size
|| !optimize
? IRA_REGION_ONE
: IRA_REGION_MIXED
;
1334 if (flag_strict_volatile_bitfields
> 0 && !abi_version_at_least (2))
1336 warning (0, "-fstrict-volatile-bitfields disabled; "
1337 "it is incompatible with ABI versions < 2");
1338 flag_strict_volatile_bitfields
= 0;
1341 /* Unrolling all loops implies that standard loop unrolling must also
1343 if (flag_unroll_all_loops
)
1344 flag_unroll_loops
= 1;
1346 /* web and rename-registers help when run after loop unrolling. */
1347 if (flag_web
== AUTODETECT_VALUE
)
1348 flag_web
= flag_unroll_loops
|| flag_peel_loops
;
1350 if (flag_rename_registers
== AUTODETECT_VALUE
)
1351 flag_rename_registers
= flag_unroll_loops
|| flag_peel_loops
;
1353 if (flag_non_call_exceptions
)
1354 flag_asynchronous_unwind_tables
= 1;
1355 if (flag_asynchronous_unwind_tables
)
1356 flag_unwind_tables
= 1;
1358 if (flag_value_profile_transformations
)
1359 flag_profile_values
= 1;
1361 /* Warn about options that are not supported on this machine. */
1362 #ifndef INSN_SCHEDULING
1363 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
1364 warning (0, "instruction scheduling not supported on this target machine");
1367 if (flag_delayed_branch
)
1368 warning (0, "this target machine does not have delayed branches");
1371 user_label_prefix
= USER_LABEL_PREFIX
;
1372 if (flag_leading_underscore
!= -1)
1374 /* If the default prefix is more complicated than "" or "_",
1375 issue a warning and ignore this option. */
1376 if (user_label_prefix
[0] == 0 ||
1377 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
1379 user_label_prefix
= flag_leading_underscore
? "_" : "";
1382 warning (0, "-f%sleading-underscore not supported on this target machine",
1383 flag_leading_underscore
? "" : "no-");
1386 /* If we are in verbose mode, write out the version and maybe all the
1387 option flags in use. */
1390 print_version (stderr
, "");
1392 print_switch_values (print_to_stderr
);
1395 if (flag_syntax_only
)
1397 write_symbols
= NO_DEBUG
;
1403 if (debug_info_level
== DINFO_LEVEL_NONE
)
1405 debug_info_level
= DINFO_LEVEL_NORMAL
;
1407 if (write_symbols
== NO_DEBUG
)
1408 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
1411 debug_info_level
= DINFO_LEVEL_NONE
;
1414 if (flag_dump_final_insns
&& !flag_syntax_only
&& !no_backend
)
1416 FILE *final_output
= fopen (flag_dump_final_insns
, "w");
1419 error ("could not open final insn dump file %qs: %m",
1420 flag_dump_final_insns
);
1421 flag_dump_final_insns
= NULL
;
1423 else if (fclose (final_output
))
1425 error ("could not close zeroed insn dump file %qs: %m",
1426 flag_dump_final_insns
);
1427 flag_dump_final_insns
= NULL
;
1431 /* Unless over-ridden for the target, assume that all DWARF levels
1432 may be emitted, if DWARF2_DEBUG is selected. */
1433 if (dwarf_strict
< 0)
1436 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1438 if (debug_info_level
== DINFO_LEVEL_NONE
)
1439 write_symbols
= NO_DEBUG
;
1441 if (write_symbols
== NO_DEBUG
)
1443 #if defined(DBX_DEBUGGING_INFO)
1444 else if (write_symbols
== DBX_DEBUG
)
1445 debug_hooks
= &dbx_debug_hooks
;
1447 #if defined(XCOFF_DEBUGGING_INFO)
1448 else if (write_symbols
== XCOFF_DEBUG
)
1449 debug_hooks
= &xcoff_debug_hooks
;
1451 #ifdef SDB_DEBUGGING_INFO
1452 else if (write_symbols
== SDB_DEBUG
)
1453 debug_hooks
= &sdb_debug_hooks
;
1455 #ifdef DWARF2_DEBUGGING_INFO
1456 else if (write_symbols
== DWARF2_DEBUG
)
1457 debug_hooks
= &dwarf2_debug_hooks
;
1459 #ifdef VMS_DEBUGGING_INFO
1460 else if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1461 debug_hooks
= &vmsdbg_debug_hooks
;
1464 error ("target system does not support the \"%s\" debug format",
1465 debug_type_names
[write_symbols
]);
1467 /* We know which debug output will be used so we can set flag_var_tracking
1468 and flag_var_tracking_uninit if the user has not specified them. */
1469 if (debug_info_level
< DINFO_LEVEL_NORMAL
1470 || debug_hooks
->var_location
== do_nothing_debug_hooks
.var_location
)
1472 if (flag_var_tracking
== 1
1473 || flag_var_tracking_uninit
== 1)
1475 if (debug_info_level
< DINFO_LEVEL_NORMAL
)
1476 warning (0, "variable tracking requested, but useless unless "
1477 "producing debug info");
1479 warning (0, "variable tracking requested, but not supported "
1480 "by this debug format");
1482 flag_var_tracking
= 0;
1483 flag_var_tracking_uninit
= 0;
1486 /* The debug hooks are used to implement -fdump-go-spec because it
1487 gives a simple and stable API for all the information we need to
1489 if (flag_dump_go_spec
!= NULL
)
1490 debug_hooks
= dump_go_spec_init (flag_dump_go_spec
, debug_hooks
);
1492 /* If the user specifically requested variable tracking with tagging
1493 uninitialized variables, we need to turn on variable tracking.
1494 (We already determined above that variable tracking is feasible.) */
1495 if (flag_var_tracking_uninit
)
1496 flag_var_tracking
= 1;
1498 if (flag_var_tracking
== AUTODETECT_VALUE
)
1499 flag_var_tracking
= optimize
>= 1;
1501 if (flag_var_tracking_assignments
== AUTODETECT_VALUE
)
1502 flag_var_tracking_assignments
= flag_var_tracking
1503 && !(flag_selective_scheduling
|| flag_selective_scheduling2
);
1505 if (flag_var_tracking_assignments_toggle
)
1506 flag_var_tracking_assignments
= !flag_var_tracking_assignments
;
1508 if (flag_var_tracking_assignments
&& !flag_var_tracking
)
1509 flag_var_tracking
= flag_var_tracking_assignments
= -1;
1511 if (flag_var_tracking_assignments
1512 && (flag_selective_scheduling
|| flag_selective_scheduling2
))
1513 warning (0, "var-tracking-assignments changes selective scheduling");
1515 if (flag_tree_cselim
== AUTODETECT_VALUE
)
1516 #ifdef HAVE_conditional_move
1517 flag_tree_cselim
= 1;
1519 flag_tree_cselim
= 0;
1522 /* If auxiliary info generation is desired, open the output file.
1523 This goes in the same directory as the source file--unlike
1524 all the other output files. */
1525 if (flag_gen_aux_info
)
1527 aux_info_file
= fopen (aux_info_file_name
, "w");
1528 if (aux_info_file
== 0)
1529 fatal_error ("can%'t open %s: %m", aux_info_file_name
);
1532 if (!targetm_common
.have_named_sections
)
1534 if (flag_function_sections
)
1536 warning (0, "-ffunction-sections not supported for this target");
1537 flag_function_sections
= 0;
1539 if (flag_data_sections
)
1541 warning (0, "-fdata-sections not supported for this target");
1542 flag_data_sections
= 0;
1546 if (flag_function_sections
&& profile_flag
)
1548 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
1549 flag_function_sections
= 0;
1552 #ifndef HAVE_prefetch
1553 if (flag_prefetch_loop_arrays
> 0)
1555 warning (0, "-fprefetch-loop-arrays not supported for this target");
1556 flag_prefetch_loop_arrays
= 0;
1559 if (flag_prefetch_loop_arrays
> 0 && !HAVE_prefetch
)
1561 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1562 flag_prefetch_loop_arrays
= 0;
1566 /* This combination of options isn't handled for i386 targets and doesn't
1567 make much sense anyway, so don't allow it. */
1568 if (flag_prefetch_loop_arrays
> 0 && optimize_size
)
1570 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1571 flag_prefetch_loop_arrays
= 0;
1574 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1575 if (flag_signaling_nans
)
1576 flag_trapping_math
= 1;
1578 /* We cannot reassociate if we want traps or signed zeros. */
1579 if (flag_associative_math
&& (flag_trapping_math
|| flag_signed_zeros
))
1581 warning (0, "-fassociative-math disabled; other options take precedence");
1582 flag_associative_math
= 0;
1585 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1586 if (flag_cx_limited_range
)
1587 flag_complex_method
= 0;
1589 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1590 if (flag_cx_fortran_rules
)
1591 flag_complex_method
= 1;
1593 /* Targets must be able to place spill slots at lower addresses. If the
1594 target already uses a soft frame pointer, the transition is trivial. */
1595 if (!FRAME_GROWS_DOWNWARD
&& flag_stack_protect
)
1597 warning (0, "-fstack-protector not supported for this target");
1598 flag_stack_protect
= 0;
1600 if (!flag_stack_protect
)
1601 warn_stack_protect
= 0;
1603 /* ??? Unwind info is not correct around the CFG unless either a frame
1604 pointer is present or A_O_A is set. Fixing this requires rewriting
1605 unwind info generation to be aware of the CFG and propagating states
1607 if (flag_unwind_tables
&& !ACCUMULATE_OUTGOING_ARGS
1608 && flag_omit_frame_pointer
)
1610 warning (0, "unwind tables currently require a frame pointer "
1612 flag_omit_frame_pointer
= 0;
1615 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1616 have not been set. */
1617 if (!global_options_set
.x_warnings_are_errors
1618 && warn_coverage_mismatch
1619 && (global_dc
->classify_diagnostic
[OPT_Wcoverage_mismatch
] ==
1621 diagnostic_classify_diagnostic (global_dc
, OPT_Wcoverage_mismatch
,
1622 DK_ERROR
, UNKNOWN_LOCATION
);
1624 /* Save the current optimization options. */
1625 optimization_default_node
= build_optimization_node ();
1626 optimization_current_node
= optimization_default_node
;
1629 /* This function can be called multiple times to reinitialize the compiler
1630 back end when register classes or instruction sets have changed,
1631 before each function. */
1633 backend_init_target (void)
1635 /* Initialize alignment variables. */
1638 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
1639 to initialize reg_raw_mode[]. */
1642 /* This invokes target hooks to set fixed_reg[] etc, which is
1646 /* This depends on stack_pointer_rtx. */
1647 init_fake_stack_mems ();
1649 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1651 init_alias_target ();
1653 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1656 /* The following initialization functions need to generate rtl, so
1657 provide a dummy function context for them. */
1658 init_dummy_function_start ();
1660 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1661 on a mode change. */
1664 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1665 after a mode change as well. */
1666 caller_save_initialized_p
= false;
1668 expand_dummy_function_end ();
1671 /* Initialize the compiler back end. This function is called only once,
1672 when starting the compiler. */
1679 init_inline_once ();
1680 init_varasm_once ();
1681 save_register_info ();
1683 /* Initialize the target-specific back end pieces. */
1685 backend_init_target ();
1688 /* Initialize excess precision settings. */
1690 init_excess_precision (void)
1692 /* Adjust excess precision handling based on the target options. If
1693 the front end cannot handle it, flag_excess_precision_cmdline
1694 will already have been set accordingly in the post_options
1696 gcc_assert (flag_excess_precision_cmdline
!= EXCESS_PRECISION_DEFAULT
);
1697 flag_excess_precision
= flag_excess_precision_cmdline
;
1698 if (flag_unsafe_math_optimizations
)
1699 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1700 if (flag_excess_precision
== EXCESS_PRECISION_STANDARD
)
1702 int flt_eval_method
= TARGET_FLT_EVAL_METHOD
;
1703 switch (flt_eval_method
)
1707 /* Either the target acts unpredictably (-1) or has all the
1708 operations required not to have excess precision (0). */
1709 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1713 /* In these cases, predictable excess precision makes
1717 /* Any other implementation-defined FLT_EVAL_METHOD values
1718 require the compiler to handle the associated excess
1719 precision rules in excess_precision_type. */
1725 /* Initialize things that are both lang-dependent and target-dependent.
1726 This function can be called more than once if target parameters change. */
1728 lang_dependent_init_target (void)
1730 /* This determines excess precision settings. */
1731 init_excess_precision ();
1733 /* This creates various _DECL nodes, so needs to be called after the
1734 front end is initialized. It also depends on the HAVE_xxx macros
1735 generated from the target machine description. */
1738 /* The following initialization functions need to generate rtl, so
1739 provide a dummy function context for them. */
1740 init_dummy_function_start ();
1742 /* Do the target-specific parts of expr initialization. */
1743 init_expr_target ();
1745 /* Although the actions of these functions are language-independent,
1746 they use optabs, so we cannot call them from backend_init. */
1750 expand_dummy_function_end ();
1753 /* Language-dependent initialization. Returns nonzero on success. */
1755 lang_dependent_init (const char *name
)
1757 location_t save_loc
= input_location
;
1758 if (dump_base_name
== 0)
1759 dump_base_name
= name
&& name
[0] ? name
: "gccdump";
1761 /* Other front-end initialization. */
1762 input_location
= BUILTINS_LOCATION
;
1763 if (lang_hooks
.init () == 0)
1765 input_location
= save_loc
;
1769 init_asm_output (name
);
1771 /* If stack usage information is desired, open the output file. */
1772 if (flag_stack_usage
)
1773 stack_usage_file
= open_auxiliary_file ("su");
1776 /* This creates various _DECL nodes, so needs to be called after the
1777 front end is initialized. */
1780 /* Do the target-specific parts of the initialization. */
1781 lang_dependent_init_target ();
1785 /* If dbx symbol table desired, initialize writing it and output the
1786 predefined types. */
1787 timevar_push (TV_SYMOUT
);
1789 /* Now we have the correct original filename, we can initialize
1791 (*debug_hooks
->init
) (name
);
1793 timevar_pop (TV_SYMOUT
);
1800 /* Reinitialize everything when target parameters, such as register usage,
1803 target_reinit (void)
1805 struct rtl_data saved_x_rtl
;
1806 rtx
*saved_regno_reg_rtx
;
1808 /* Save *crtl and regno_reg_rtx around the reinitialization
1809 to allow target_reinit being called even after prepare_function_start. */
1810 saved_regno_reg_rtx
= regno_reg_rtx
;
1811 if (saved_regno_reg_rtx
)
1813 saved_x_rtl
= *crtl
;
1814 memset (crtl
, '\0', sizeof (*crtl
));
1815 regno_reg_rtx
= NULL
;
1818 /* Reinitialize RTL backend. */
1819 backend_init_target ();
1821 /* Reinitialize lang-dependent parts. */
1822 lang_dependent_init_target ();
1824 /* And restore it at the end, as free_after_compilation from
1825 expand_dummy_function_end clears it. */
1826 if (saved_regno_reg_rtx
)
1828 *crtl
= saved_x_rtl
;
1829 regno_reg_rtx
= saved_regno_reg_rtx
;
1830 saved_regno_reg_rtx
= NULL
;
1835 dump_memory_report (bool final
)
1837 dump_line_table_statistics ();
1838 ggc_print_statistics ();
1839 stringpool_statistics ();
1840 dump_tree_statistics ();
1841 dump_gimple_statistics ();
1842 dump_rtx_statistics ();
1843 dump_alloc_pool_statistics ();
1844 dump_bitmap_statistics ();
1845 dump_vec_loc_statistics ();
1846 dump_ggc_loc_statistics (final
);
1847 dump_alias_stats (stderr
);
1848 dump_pta_stats (stderr
);
1851 /* Clean up: close opened files, etc. */
1854 finalize (bool no_backend
)
1856 /* Close the dump files. */
1857 if (flag_gen_aux_info
)
1859 fclose (aux_info_file
);
1861 unlink (aux_info_file_name
);
1864 /* Close non-debugging input and output files. Take special care to note
1865 whether fclose returns an error, since the pages might still be on the
1866 buffer chain while the file is open. */
1870 if (ferror (asm_out_file
) != 0)
1871 fatal_error ("error writing to %s: %m", asm_file_name
);
1872 if (fclose (asm_out_file
) != 0)
1873 fatal_error ("error closing %s: %m", asm_file_name
);
1876 if (stack_usage_file
)
1877 fclose (stack_usage_file
);
1883 finish_optimization_passes ();
1889 dump_memory_report (true);
1891 /* Language-specific end of compilation actions. */
1892 lang_hooks
.finish ();
1895 /* Initialize the compiler, and compile the input file. */
1899 /* Initialize timing first. The C front ends read the main file in
1900 the post_options hook, and C++ does file timings. */
1901 if (time_report
|| !quiet_flag
|| flag_detailed_statistics
)
1903 timevar_start (TV_TOTAL
);
1907 /* Don't do any more if an error has already occurred. */
1910 timevar_start (TV_PHASE_SETUP
);
1912 /* This must be run always, because it is needed to compute the FP
1913 predefined macros, such as __LDBL_MAX__, for targets using non
1914 default FP formats. */
1915 init_adjust_machine_modes ();
1917 /* Set up the back-end if requested. */
1921 /* Language-dependent initialization. Returns true on success. */
1922 if (lang_dependent_init (main_input_filename
))
1924 /* Initialize yet another pass. */
1926 ggc_protect_identifiers
= true;
1929 init_final (main_input_filename
);
1930 coverage_init (aux_base_name
);
1932 invoke_plugin_callbacks (PLUGIN_START_UNIT
, NULL
);
1934 timevar_stop (TV_PHASE_SETUP
);
1940 timevar_stop (TV_PHASE_SETUP
);
1943 timevar_start (TV_PHASE_FINALIZE
);
1945 finalize (no_backend
);
1947 timevar_stop (TV_PHASE_FINALIZE
);
1950 /* Stop timing and print the times. */
1951 timevar_stop (TV_TOTAL
);
1952 timevar_print (stderr
);
1955 /* Entry point of cc1, cc1plus, jc1, f771, etc.
1956 Exit code is FATAL_EXIT_CODE if can't open files or if there were
1957 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
1959 It is not safe to call this function more than once. */
1962 toplev_main (int argc
, char **argv
)
1964 /* Parsing and gimplification sometimes need quite large stack.
1965 Increase stack size limits if possible. */
1966 stack_limit_increase (64 * 1024 * 1024);
1968 expandargv (&argc
, &argv
);
1970 /* Initialization of GCC's environment, and diagnostics. */
1971 general_init (argv
[0]);
1973 /* One-off initialization of options that does not need to be
1974 repeated when options are added for particular functions. */
1975 init_options_once ();
1977 /* Initialize global options structures; this must be repeated for
1978 each structure used for parsing options. */
1979 init_options_struct (&global_options
, &global_options_set
);
1980 lang_hooks
.init_options_struct (&global_options
);
1982 /* Convert the options to an array. */
1983 decode_cmdline_options_to_array_default_mask (argc
,
1984 CONST_CAST2 (const char **,
1986 &save_decoded_options
,
1987 &save_decoded_options_count
);
1989 /* Perform language-specific options initialization. */
1990 lang_hooks
.init_options (save_decoded_options_count
, save_decoded_options
);
1992 /* Parse the options and do minimal processing; basically just
1993 enough to default flags appropriately. */
1994 decode_options (&global_options
, &global_options_set
,
1995 save_decoded_options
, save_decoded_options_count
,
1996 UNKNOWN_LOCATION
, global_dc
);
1998 handle_common_deferred_options ();
2002 initialize_plugins ();
2005 print_version (stderr
, "");
2008 print_plugins_help (stderr
, "");
2010 /* Exit early if we can (e.g. -help). */
2011 if (!exit_after_options
)
2014 if (warningcount
|| errorcount
)
2015 print_ignored_options ();
2016 diagnostic_finish (global_dc
);
2018 /* Invoke registered plugin callbacks if any. */
2019 invoke_plugin_callbacks (PLUGIN_FINISH
, NULL
);
2021 finalize_plugins ();
2023 return (FATAL_EXIT_CODE
);
2025 return (SUCCESS_EXIT_CODE
);