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;
489 assemble_external (decl
);
492 /* Warn about static fns or vars defined but not used. */
493 if (((warn_unused_function
&& TREE_CODE (decl
) == FUNCTION_DECL
)
494 /* We don't warn about "static const" variables because the
495 "rcs_id" idiom uses that construction. */
496 || (warn_unused_variable
497 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
498 && ! DECL_IN_SYSTEM_HEADER (decl
)
499 && ! TREE_USED (decl
)
500 /* The TREE_USED bit for file-scope decls is kept in the identifier,
501 to handle multiple external decls in different scopes. */
502 && ! (DECL_NAME (decl
) && TREE_USED (DECL_NAME (decl
)))
503 && ! DECL_EXTERNAL (decl
)
504 && ! TREE_PUBLIC (decl
)
505 /* A volatile variable might be used in some non-obvious way. */
506 && ! TREE_THIS_VOLATILE (decl
)
507 /* Global register variables must be declared to reserve them. */
508 && ! (TREE_CODE (decl
) == VAR_DECL
&& DECL_REGISTER (decl
))
509 /* Otherwise, ask the language. */
510 && lang_hooks
.decls
.warn_unused_global (decl
))
511 warning ((TREE_CODE (decl
) == FUNCTION_DECL
)
512 ? OPT_Wunused_function
513 : OPT_Wunused_variable
,
514 "%q+D defined but not used", decl
);
517 /* Issue appropriate warnings for the global declarations in VEC (of
518 which there are LEN). */
521 check_global_declarations (tree
*vec
, int len
)
525 for (i
= 0; i
< len
; i
++)
526 check_global_declaration_1 (vec
[i
]);
529 /* Emit debugging information for all global declarations in VEC. */
532 emit_debug_global_declarations (tree
*vec
, int len
)
536 /* Avoid confusing the debug information machinery when there are errors. */
540 timevar_push (TV_SYMOUT
);
541 for (i
= 0; i
< len
; i
++)
542 debug_hooks
->global_decl (vec
[i
]);
543 timevar_pop (TV_SYMOUT
);
546 /* Compile an entire translation unit. Write a file of assembly
547 output and various debugging dumps. */
552 timevar_start (TV_PHASE_PARSING
);
553 timevar_push (TV_PARSE_GLOBAL
);
555 /* Call the parser, which parses the entire file (calling
556 rest_of_compilation for each function). */
557 lang_hooks
.parse_file ();
559 timevar_pop (TV_PARSE_GLOBAL
);
560 timevar_stop (TV_PHASE_PARSING
);
562 /* Compilation is now finished except for writing
563 what's left of the symbol table output. */
565 if (flag_syntax_only
|| flag_wpa
)
568 timevar_start (TV_PHASE_GENERATE
);
570 ggc_protect_identifiers
= false;
572 /* This must also call cgraph_finalize_compilation_unit. */
573 lang_hooks
.decls
.final_write_globals ();
577 timevar_stop (TV_PHASE_GENERATE
);
581 /* Compilation unit is finalized. When producing non-fat LTO object, we are
582 basically finished. */
583 if (in_lto_p
|| !flag_lto
|| flag_fat_lto_objects
)
585 varpool_assemble_pending_decls ();
588 /* Likewise for mudflap static object registrations. */
590 mudflap_finish_file ();
592 output_shared_constant_pool ();
593 output_object_blocks ();
594 finish_tm_clone_pairs ();
596 /* Write out any pending weak symbol declarations. */
599 /* This must be at the end before unwind and debug info.
600 Some target ports emit PIC setup thunks here. */
601 targetm
.asm_out
.code_end ();
603 /* Do dbx symbols. */
604 timevar_push (TV_SYMOUT
);
606 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
607 if (dwarf2out_do_frame ())
608 dwarf2out_frame_finish ();
611 (*debug_hooks
->finish
) (main_input_filename
);
612 timevar_pop (TV_SYMOUT
);
614 /* Output some stuff at end of file if nec. */
616 dw2_output_indirect_constants ();
618 /* Flush any pending external directives. */
619 process_pending_assemble_externals ();
622 /* Emit LTO marker if LTO info has been previously emitted. This is
623 used by collect2 to determine whether an object file contains IL.
624 We used to emit an undefined reference here, but this produces
625 link errors if an object file with IL is stored into a shared
626 library without invoking lto1. */
627 if (flag_generate_lto
)
629 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
630 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
,
632 (unsigned HOST_WIDE_INT
) 1, 8);
633 #elif defined ASM_OUTPUT_ALIGNED_COMMON
634 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_v1",
635 (unsigned HOST_WIDE_INT
) 1, 8);
637 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_v1",
638 (unsigned HOST_WIDE_INT
) 1,
639 (unsigned HOST_WIDE_INT
) 1);
641 /* Let linker plugin know that this is a slim object and must be LTOed
642 even when user did not ask for it. */
643 if (!flag_fat_lto_objects
)
645 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
646 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
,
648 (unsigned HOST_WIDE_INT
) 1, 8);
649 #elif defined ASM_OUTPUT_ALIGNED_COMMON
650 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_slim",
651 (unsigned HOST_WIDE_INT
) 1, 8);
653 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_slim",
654 (unsigned HOST_WIDE_INT
) 1,
655 (unsigned HOST_WIDE_INT
) 1);
660 /* Attach a special .ident directive to the end of the file to identify
661 the version of GCC which compiled this code. The format of the .ident
662 string is patterned after the ones produced by native SVR4 compilers. */
666 const char *pkg_version
= "(GNU) ";
668 if (strcmp ("(GCC) ", pkgversion_string
))
669 pkg_version
= pkgversion_string
;
670 fprintf (asm_out_file
, "%s\"GCC: %s%s\"\n",
671 IDENT_ASM_OP
, pkg_version
, version_string
);
675 /* Invoke registered plugin callbacks. */
676 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT
, NULL
);
678 /* This must be at the end. Some target ports emit end of file directives
679 into the assembly file here, and hence we can not output anything to the
680 assembly file after this point. */
681 targetm
.asm_out
.file_end ();
683 timevar_stop (TV_PHASE_GENERATE
);
686 /* Print version information to FILE.
687 Each line begins with INDENT (for the case where FILE is the
688 assembler output file). */
691 print_version (FILE *file
, const char *indent
)
693 static const char fmt1
[] =
695 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
697 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
700 static const char fmt2
[] =
701 N_("GMP version %s, MPFR version %s, MPC version %s\n");
702 static const char fmt3
[] =
703 N_("%s%swarning: %s header version %s differs from library version %s.\n");
704 static const char fmt4
[] =
705 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
707 #define __VERSION__ "[?]"
710 file
== stderr
? _(fmt1
) : fmt1
,
711 indent
, *indent
!= 0 ? " " : "",
712 lang_hooks
.name
, pkgversion_string
, version_string
, TARGET_NAME
,
713 indent
, __VERSION__
);
715 /* We need to stringify the GMP macro values. Ugh, gmp_version has
716 two string formats, "i.j.k" and "i.j" when k is zero. As of
717 gmp-4.3.0, GMP always uses the 3 number format. */
718 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
719 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3(X)
720 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
721 #define GCC_GMP_VERSION \
722 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
723 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
724 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
725 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR)
727 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
728 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) "." \
729 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_PATCHLEVEL)
732 file
== stderr
? _(fmt2
) : fmt2
,
733 GCC_GMP_STRINGIFY_VERSION
, MPFR_VERSION_STRING
, MPC_VERSION_STRING
);
734 if (strcmp (GCC_GMP_STRINGIFY_VERSION
, gmp_version
))
736 file
== stderr
? _(fmt3
) : fmt3
,
737 indent
, *indent
!= 0 ? " " : "",
738 "GMP", GCC_GMP_STRINGIFY_VERSION
, gmp_version
);
739 if (strcmp (MPFR_VERSION_STRING
, mpfr_get_version ()))
741 file
== stderr
? _(fmt3
) : fmt3
,
742 indent
, *indent
!= 0 ? " " : "",
743 "MPFR", MPFR_VERSION_STRING
, mpfr_get_version ());
744 if (strcmp (MPC_VERSION_STRING
, mpc_get_version ()))
746 file
== stderr
? _(fmt3
) : fmt3
,
747 indent
, *indent
!= 0 ? " " : "",
748 "MPC", MPC_VERSION_STRING
, mpc_get_version ());
750 file
== stderr
? _(fmt4
) : fmt4
,
751 indent
, *indent
!= 0 ? " " : "",
752 PARAM_VALUE (GGC_MIN_EXPAND
), PARAM_VALUE (GGC_MIN_HEAPSIZE
));
754 print_plugins_versions (file
, indent
);
758 print_to_asm_out_file (print_switch_type type
, const char * text
)
760 bool prepend_sep
= true;
764 case SWITCH_TYPE_LINE_END
:
765 putc ('\n', asm_out_file
);
768 case SWITCH_TYPE_LINE_START
:
769 fputs (ASM_COMMENT_START
, asm_out_file
);
770 return strlen (ASM_COMMENT_START
);
772 case SWITCH_TYPE_DESCRIPTIVE
:
773 if (ASM_COMMENT_START
[0] == 0)
776 case SWITCH_TYPE_PASSED
:
777 case SWITCH_TYPE_ENABLED
:
779 fputc (' ', asm_out_file
);
780 fputs (text
, asm_out_file
);
781 /* No need to return the length here as
782 print_single_switch has already done it. */
791 print_to_stderr (print_switch_type type
, const char * text
)
795 case SWITCH_TYPE_LINE_END
:
799 case SWITCH_TYPE_LINE_START
:
802 case SWITCH_TYPE_PASSED
:
803 case SWITCH_TYPE_ENABLED
:
807 case SWITCH_TYPE_DESCRIPTIVE
:
808 fputs (text
, stderr
);
809 /* No need to return the length here as
810 print_single_switch has already done it. */
818 /* Print an option value and return the adjusted position in the line.
819 ??? print_fn doesn't handle errors, eg disk full; presumably other
820 code will catch a disk full though. */
823 print_single_switch (print_switch_fn_type print_fn
,
825 print_switch_type type
,
828 /* The ultrix fprintf returns 0 on success, so compute the result
829 we want here since we need it for the following test. The +1
830 is for the separator character that will probably be emitted. */
831 int len
= strlen (text
) + 1;
834 && pos
+ len
> MAX_LINE
)
836 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
841 pos
+= print_fn (SWITCH_TYPE_LINE_START
, NULL
);
843 print_fn (type
, text
);
847 /* Print active target switches using PRINT_FN.
848 POS is the current cursor position and MAX is the size of a "line".
849 Each line begins with INDENT and ends with TERM.
850 Each switch is separated from the next by SEP. */
853 print_switch_values (print_switch_fn_type print_fn
)
858 /* Fill in the -frandom-seed option, if the user didn't pass it, so
859 that it can be printed below. This helps reproducibility. */
860 if (!flag_random_seed
)
863 /* Print the options as passed. */
864 pos
= print_single_switch (print_fn
, pos
,
865 SWITCH_TYPE_DESCRIPTIVE
, _("options passed: "));
867 for (j
= 1; j
< save_decoded_options_count
; j
++)
869 switch (save_decoded_options
[j
].opt_index
)
882 pos
= print_single_switch (print_fn
, pos
, SWITCH_TYPE_PASSED
,
883 save_decoded_options
[j
].orig_option_with_args_text
);
887 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
889 /* Print the -f and -m options that have been enabled.
890 We don't handle language specific options but printing argv
892 pos
= print_single_switch (print_fn
, 0,
893 SWITCH_TYPE_DESCRIPTIVE
, _("options enabled: "));
895 for (j
= 0; j
< cl_options_count
; j
++)
896 if (cl_options
[j
].cl_report
897 && option_enabled (j
, &global_options
) > 0)
898 pos
= print_single_switch (print_fn
, pos
,
899 SWITCH_TYPE_ENABLED
, cl_options
[j
].opt_text
);
901 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
904 /* Open assembly code output file. Do this even if -fsyntax-only is
905 on, because then the driver will have provided the name of a
906 temporary file or bit bucket for us. NAME is the file specified on
907 the command line, possibly NULL. */
909 init_asm_output (const char *name
)
911 if (name
== NULL
&& asm_file_name
== 0)
912 asm_out_file
= stdout
;
915 if (asm_file_name
== 0)
917 int len
= strlen (dump_base_name
);
918 char *dumpname
= XNEWVEC (char, len
+ 6);
920 memcpy (dumpname
, dump_base_name
, len
+ 1);
921 strip_off_ending (dumpname
, len
);
922 strcat (dumpname
, ".s");
923 asm_file_name
= dumpname
;
925 if (!strcmp (asm_file_name
, "-"))
926 asm_out_file
= stdout
;
928 asm_out_file
= fopen (asm_file_name
, "w+b");
929 if (asm_out_file
== 0)
930 fatal_error ("can%'t open %s for writing: %m", asm_file_name
);
933 if (!flag_syntax_only
)
935 targetm
.asm_out
.file_start ();
937 if (flag_record_gcc_switches
)
939 if (targetm
.asm_out
.record_gcc_switches
)
941 /* Let the target know that we are about to start recording. */
942 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
944 /* Now record the switches. */
945 print_switch_values (targetm
.asm_out
.record_gcc_switches
);
946 /* Let the target know that the recording is over. */
947 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
951 inform (input_location
, "-frecord-gcc-switches is not supported by the current target");
954 if (flag_verbose_asm
)
956 /* Print the list of switches in effect
957 into the assembler file as comments. */
958 print_version (asm_out_file
, ASM_COMMENT_START
);
959 print_switch_values (print_to_asm_out_file
);
960 putc ('\n', asm_out_file
);
965 /* Default tree printer. Handles declarations only. */
967 default_tree_printer (pretty_printer
*pp
, text_info
*text
, const char *spec
,
968 int precision
, bool wide
, bool set_locus
, bool hash
)
972 /* FUTURE: %+x should set the locus. */
973 if (precision
!= 0 || wide
|| hash
)
979 t
= va_arg (*text
->args_ptr
, tree
);
980 if (TREE_CODE (t
) == IDENTIFIER_NODE
)
982 pp_identifier (pp
, IDENTIFIER_POINTER (t
));
988 t
= va_arg (*text
->args_ptr
, tree
);
989 if (DECL_DEBUG_EXPR_IS_FROM (t
) && DECL_DEBUG_EXPR (t
))
990 t
= DECL_DEBUG_EXPR (t
);
995 t
= va_arg (*text
->args_ptr
, tree
);
999 percent_K_format (text
);
1006 if (set_locus
&& text
->locus
)
1007 *text
->locus
= DECL_SOURCE_LOCATION (t
);
1011 const char *n
= DECL_NAME (t
)
1012 ? identifier_to_locale (lang_hooks
.decl_printable_name (t
, 2))
1017 dump_generic_node (pp
, t
, 0, TDF_DIAGNOSTIC
, 0);
1022 /* A helper function; used as the reallocator function for cpp's line
1025 realloc_for_line_map (void *ptr
, size_t len
)
1027 return GGC_RESIZEVAR (void, ptr
, len
);
1030 /* A helper function: used as the allocator function for
1031 identifier_to_locale. */
1033 alloc_for_identifier_to_locale (size_t len
)
1035 return ggc_alloc_atomic (len
);
1038 /* Output stack usage information. */
1040 output_stack_usage (void)
1042 static bool warning_issued
= false;
1043 enum stack_usage_kind_type
{ STATIC
= 0, DYNAMIC
, DYNAMIC_BOUNDED
};
1044 const char *stack_usage_kind_str
[] = {
1049 HOST_WIDE_INT stack_usage
= current_function_static_stack_size
;
1050 enum stack_usage_kind_type stack_usage_kind
;
1052 if (stack_usage
< 0)
1054 if (!warning_issued
)
1056 warning (0, "stack usage computation not supported for this target");
1057 warning_issued
= true;
1062 stack_usage_kind
= STATIC
;
1064 /* Add the maximum amount of space pushed onto the stack. */
1065 if (current_function_pushed_stack_size
> 0)
1067 stack_usage
+= current_function_pushed_stack_size
;
1068 stack_usage_kind
= DYNAMIC_BOUNDED
;
1071 /* Now on to the tricky part: dynamic stack allocation. */
1072 if (current_function_allocates_dynamic_stack_space
)
1074 if (current_function_has_unbounded_dynamic_stack_size
)
1075 stack_usage_kind
= DYNAMIC
;
1077 stack_usage_kind
= DYNAMIC_BOUNDED
;
1079 /* Add the size even in the unbounded case, this can't hurt. */
1080 stack_usage
+= current_function_dynamic_stack_size
;
1083 if (flag_stack_usage
)
1085 expanded_location loc
1086 = expand_location (DECL_SOURCE_LOCATION (current_function_decl
));
1087 const char *raw_id
, *id
;
1089 /* Strip the scope prefix if any. */
1090 raw_id
= lang_hooks
.decl_printable_name (current_function_decl
, 2);
1091 id
= strrchr (raw_id
, '.');
1097 fprintf (stack_usage_file
,
1098 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC
"\t%s\n",
1099 lbasename (loc
.file
),
1104 stack_usage_kind_str
[stack_usage_kind
]);
1107 if (warn_stack_usage
>= 0)
1109 if (stack_usage_kind
== DYNAMIC
)
1110 warning (OPT_Wstack_usage_
, "stack usage might be unbounded");
1111 else if (stack_usage
> warn_stack_usage
)
1113 if (stack_usage_kind
== DYNAMIC_BOUNDED
)
1114 warning (OPT_Wstack_usage_
, "stack usage might be %wd bytes",
1117 warning (OPT_Wstack_usage_
, "stack usage is %wd bytes",
1123 /* Open an auxiliary output file. */
1125 open_auxiliary_file (const char *ext
)
1130 filename
= concat (aux_base_name
, ".", ext
, NULL
);
1131 file
= fopen (filename
, "w");
1133 fatal_error ("can%'t open %s for writing: %m", filename
);
1138 /* Initialization of the front end environment, before command line
1139 options are parsed. Signal handlers, internationalization etc.
1140 ARGV0 is main's argv[0]. */
1142 general_init (const char *argv0
)
1146 p
= argv0
+ strlen (argv0
);
1147 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
1151 xmalloc_set_program_name (progname
);
1155 /* Unlock the stdio streams. */
1156 unlock_std_streams ();
1158 gcc_init_libintl ();
1160 identifier_to_locale_alloc
= alloc_for_identifier_to_locale
;
1161 identifier_to_locale_free
= ggc_free
;
1163 /* Initialize the diagnostics reporting machinery, so option parsing
1164 can give warnings and errors. */
1165 diagnostic_initialize (global_dc
, N_OPTS
);
1166 diagnostic_starter (global_dc
) = default_tree_diagnostic_starter
;
1167 /* By default print macro expansion contexts in the diagnostic
1168 finalizer -- for tokens resulting from macro macro expansion. */
1169 diagnostic_finalizer (global_dc
) = virt_loc_aware_diagnostic_finalizer
;
1170 /* Set a default printer. Language specific initializations will
1171 override it later. */
1172 pp_format_decoder (global_dc
->printer
) = &default_tree_printer
;
1173 global_dc
->show_option_requested
1174 = global_options_init
.x_flag_diagnostics_show_option
;
1175 global_dc
->show_column
1176 = global_options_init
.x_flag_show_column
;
1177 global_dc
->internal_error
= plugins_internal_error_function
;
1178 global_dc
->option_enabled
= option_enabled
;
1179 global_dc
->option_state
= &global_options
;
1180 global_dc
->option_name
= option_name
;
1182 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1184 signal (SIGSEGV
, crash_signal
);
1187 signal (SIGILL
, crash_signal
);
1190 signal (SIGBUS
, crash_signal
);
1193 signal (SIGABRT
, crash_signal
);
1195 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1196 signal (SIGIOT
, crash_signal
);
1199 signal (SIGFPE
, crash_signal
);
1202 /* Other host-specific signal setup. */
1203 (*host_hooks
.extra_signals
)();
1205 /* Initialize the garbage-collector, string pools and tree type hash
1209 line_table
= ggc_alloc_line_maps ();
1210 linemap_init (line_table
);
1211 line_table
->reallocator
= realloc_for_line_map
;
1212 line_table
->round_alloc_size
= ggc_round_alloc_size
;
1215 /* Initialize register usage now so switches may override. */
1218 /* Register the language-independent parameters. */
1219 global_init_params ();
1221 /* This must be done after global_init_params but before argument
1223 init_ggc_heuristics();
1224 init_optimization_passes ();
1225 statistics_early_init ();
1229 /* Return true if the current target supports -fsection-anchors. */
1232 target_supports_section_anchors_p (void)
1234 if (targetm
.min_anchor_offset
== 0 && targetm
.max_anchor_offset
== 0)
1237 if (targetm
.asm_out
.output_anchor
== NULL
)
1243 /* Default the align_* variables to 1 if they're still unset, and
1244 set up the align_*_log variables. */
1246 init_alignments (void)
1248 if (align_loops
<= 0)
1250 if (align_loops_max_skip
> align_loops
)
1251 align_loops_max_skip
= align_loops
- 1;
1252 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
1253 if (align_jumps
<= 0)
1255 if (align_jumps_max_skip
> align_jumps
)
1256 align_jumps_max_skip
= align_jumps
- 1;
1257 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
1258 if (align_labels
<= 0)
1260 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
1261 if (align_labels_max_skip
> align_labels
)
1262 align_labels_max_skip
= align_labels
- 1;
1263 if (align_functions
<= 0)
1264 align_functions
= 1;
1265 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
1268 /* Process the options that have been parsed. */
1270 process_options (void)
1272 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1273 This can happen with incorrect pre-processed input. */
1274 debug_hooks
= &do_nothing_debug_hooks
;
1276 maximum_field_alignment
= initial_max_fld_align
* BITS_PER_UNIT
;
1278 /* Allow the front end to perform consistency checks and do further
1279 initialization based on the command line options. This hook also
1280 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1281 so we can correctly initialize debug output. */
1282 no_backend
= lang_hooks
.post_options (&main_input_filename
);
1284 /* Some machines may reject certain combinations of options. */
1285 targetm
.target_option
.override ();
1287 /* Avoid any informative notes in the second run of -fcompare-debug. */
1288 if (flag_compare_debug
)
1289 diagnostic_inhibit_notes (global_dc
);
1291 if (flag_section_anchors
&& !target_supports_section_anchors_p ())
1293 warning (OPT_fsection_anchors
,
1294 "this target does not support %qs", "-fsection-anchors");
1295 flag_section_anchors
= 0;
1298 if (flag_short_enums
== 2)
1299 flag_short_enums
= targetm
.default_short_enums ();
1301 /* Set aux_base_name if not already set. */
1304 else if (main_input_filename
)
1306 char *name
= xstrdup (lbasename (main_input_filename
));
1308 strip_off_ending (name
, strlen (name
));
1309 aux_base_name
= name
;
1312 aux_base_name
= "gccaux";
1316 || flag_graphite_identity
1318 || flag_loop_interchange
1319 || flag_loop_strip_mine
1320 || flag_loop_parallelize_all
)
1321 sorry ("Graphite loop optimizations cannot be used (-fgraphite, "
1322 "-fgraphite-identity, -floop-block, "
1323 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1324 "and -ftree-loop-linear)");
1327 if (flag_mudflap
&& flag_lto
)
1328 sorry ("mudflap cannot be used together with link-time optimization");
1330 /* One region RA really helps to decrease the code size. */
1331 if (flag_ira_region
== IRA_REGION_AUTODETECT
)
1333 = optimize_size
|| !optimize
? IRA_REGION_ONE
: IRA_REGION_MIXED
;
1335 if (flag_strict_volatile_bitfields
> 0 && !abi_version_at_least (2))
1337 warning (0, "-fstrict-volatile-bitfields disabled; "
1338 "it is incompatible with ABI versions < 2");
1339 flag_strict_volatile_bitfields
= 0;
1342 /* Unrolling all loops implies that standard loop unrolling must also
1344 if (flag_unroll_all_loops
)
1345 flag_unroll_loops
= 1;
1347 /* web and rename-registers help when run after loop unrolling. */
1348 if (flag_web
== AUTODETECT_VALUE
)
1349 flag_web
= flag_unroll_loops
|| flag_peel_loops
;
1351 if (flag_rename_registers
== AUTODETECT_VALUE
)
1352 flag_rename_registers
= flag_unroll_loops
|| flag_peel_loops
;
1354 if (flag_non_call_exceptions
)
1355 flag_asynchronous_unwind_tables
= 1;
1356 if (flag_asynchronous_unwind_tables
)
1357 flag_unwind_tables
= 1;
1359 if (flag_value_profile_transformations
)
1360 flag_profile_values
= 1;
1362 /* Warn about options that are not supported on this machine. */
1363 #ifndef INSN_SCHEDULING
1364 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
1365 warning (0, "instruction scheduling not supported on this target machine");
1368 if (flag_delayed_branch
)
1369 warning (0, "this target machine does not have delayed branches");
1372 user_label_prefix
= USER_LABEL_PREFIX
;
1373 if (flag_leading_underscore
!= -1)
1375 /* If the default prefix is more complicated than "" or "_",
1376 issue a warning and ignore this option. */
1377 if (user_label_prefix
[0] == 0 ||
1378 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
1380 user_label_prefix
= flag_leading_underscore
? "_" : "";
1383 warning (0, "-f%sleading-underscore not supported on this target machine",
1384 flag_leading_underscore
? "" : "no-");
1387 /* If we are in verbose mode, write out the version and maybe all the
1388 option flags in use. */
1391 print_version (stderr
, "");
1393 print_switch_values (print_to_stderr
);
1396 if (flag_syntax_only
)
1398 write_symbols
= NO_DEBUG
;
1404 if (debug_info_level
== DINFO_LEVEL_NONE
)
1406 debug_info_level
= DINFO_LEVEL_NORMAL
;
1408 if (write_symbols
== NO_DEBUG
)
1409 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
1412 debug_info_level
= DINFO_LEVEL_NONE
;
1415 if (flag_dump_final_insns
&& !flag_syntax_only
&& !no_backend
)
1417 FILE *final_output
= fopen (flag_dump_final_insns
, "w");
1420 error ("could not open final insn dump file %qs: %m",
1421 flag_dump_final_insns
);
1422 flag_dump_final_insns
= NULL
;
1424 else if (fclose (final_output
))
1426 error ("could not close zeroed insn dump file %qs: %m",
1427 flag_dump_final_insns
);
1428 flag_dump_final_insns
= NULL
;
1432 /* Unless over-ridden for the target, assume that all DWARF levels
1433 may be emitted, if DWARF2_DEBUG is selected. */
1434 if (dwarf_strict
< 0)
1437 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1439 if (debug_info_level
== DINFO_LEVEL_NONE
)
1440 write_symbols
= NO_DEBUG
;
1442 if (write_symbols
== NO_DEBUG
)
1444 #if defined(DBX_DEBUGGING_INFO)
1445 else if (write_symbols
== DBX_DEBUG
)
1446 debug_hooks
= &dbx_debug_hooks
;
1448 #if defined(XCOFF_DEBUGGING_INFO)
1449 else if (write_symbols
== XCOFF_DEBUG
)
1450 debug_hooks
= &xcoff_debug_hooks
;
1452 #ifdef SDB_DEBUGGING_INFO
1453 else if (write_symbols
== SDB_DEBUG
)
1454 debug_hooks
= &sdb_debug_hooks
;
1456 #ifdef DWARF2_DEBUGGING_INFO
1457 else if (write_symbols
== DWARF2_DEBUG
)
1458 debug_hooks
= &dwarf2_debug_hooks
;
1460 #ifdef VMS_DEBUGGING_INFO
1461 else if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1462 debug_hooks
= &vmsdbg_debug_hooks
;
1465 error ("target system does not support the \"%s\" debug format",
1466 debug_type_names
[write_symbols
]);
1468 /* We know which debug output will be used so we can set flag_var_tracking
1469 and flag_var_tracking_uninit if the user has not specified them. */
1470 if (debug_info_level
< DINFO_LEVEL_NORMAL
1471 || debug_hooks
->var_location
== do_nothing_debug_hooks
.var_location
)
1473 if (flag_var_tracking
== 1
1474 || flag_var_tracking_uninit
== 1)
1476 if (debug_info_level
< DINFO_LEVEL_NORMAL
)
1477 warning (0, "variable tracking requested, but useless unless "
1478 "producing debug info");
1480 warning (0, "variable tracking requested, but not supported "
1481 "by this debug format");
1483 flag_var_tracking
= 0;
1484 flag_var_tracking_uninit
= 0;
1487 /* The debug hooks are used to implement -fdump-go-spec because it
1488 gives a simple and stable API for all the information we need to
1490 if (flag_dump_go_spec
!= NULL
)
1491 debug_hooks
= dump_go_spec_init (flag_dump_go_spec
, debug_hooks
);
1493 /* If the user specifically requested variable tracking with tagging
1494 uninitialized variables, we need to turn on variable tracking.
1495 (We already determined above that variable tracking is feasible.) */
1496 if (flag_var_tracking_uninit
)
1497 flag_var_tracking
= 1;
1499 if (flag_var_tracking
== AUTODETECT_VALUE
)
1500 flag_var_tracking
= optimize
>= 1;
1502 if (flag_var_tracking_assignments
== AUTODETECT_VALUE
)
1503 flag_var_tracking_assignments
= flag_var_tracking
1504 && !(flag_selective_scheduling
|| flag_selective_scheduling2
);
1506 if (flag_var_tracking_assignments_toggle
)
1507 flag_var_tracking_assignments
= !flag_var_tracking_assignments
;
1509 if (flag_var_tracking_assignments
&& !flag_var_tracking
)
1510 flag_var_tracking
= flag_var_tracking_assignments
= -1;
1512 if (flag_var_tracking_assignments
1513 && (flag_selective_scheduling
|| flag_selective_scheduling2
))
1514 warning (0, "var-tracking-assignments changes selective scheduling");
1516 if (flag_tree_cselim
== AUTODETECT_VALUE
)
1517 #ifdef HAVE_conditional_move
1518 flag_tree_cselim
= 1;
1520 flag_tree_cselim
= 0;
1523 /* If auxiliary info generation is desired, open the output file.
1524 This goes in the same directory as the source file--unlike
1525 all the other output files. */
1526 if (flag_gen_aux_info
)
1528 aux_info_file
= fopen (aux_info_file_name
, "w");
1529 if (aux_info_file
== 0)
1530 fatal_error ("can%'t open %s: %m", aux_info_file_name
);
1533 if (!targetm_common
.have_named_sections
)
1535 if (flag_function_sections
)
1537 warning (0, "-ffunction-sections not supported for this target");
1538 flag_function_sections
= 0;
1540 if (flag_data_sections
)
1542 warning (0, "-fdata-sections not supported for this target");
1543 flag_data_sections
= 0;
1547 if (flag_function_sections
&& profile_flag
)
1549 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
1550 flag_function_sections
= 0;
1553 #ifndef HAVE_prefetch
1554 if (flag_prefetch_loop_arrays
> 0)
1556 warning (0, "-fprefetch-loop-arrays not supported for this target");
1557 flag_prefetch_loop_arrays
= 0;
1560 if (flag_prefetch_loop_arrays
> 0 && !HAVE_prefetch
)
1562 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1563 flag_prefetch_loop_arrays
= 0;
1567 /* This combination of options isn't handled for i386 targets and doesn't
1568 make much sense anyway, so don't allow it. */
1569 if (flag_prefetch_loop_arrays
> 0 && optimize_size
)
1571 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1572 flag_prefetch_loop_arrays
= 0;
1575 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1576 if (flag_signaling_nans
)
1577 flag_trapping_math
= 1;
1579 /* We cannot reassociate if we want traps or signed zeros. */
1580 if (flag_associative_math
&& (flag_trapping_math
|| flag_signed_zeros
))
1582 warning (0, "-fassociative-math disabled; other options take precedence");
1583 flag_associative_math
= 0;
1586 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1587 if (flag_cx_limited_range
)
1588 flag_complex_method
= 0;
1590 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1591 if (flag_cx_fortran_rules
)
1592 flag_complex_method
= 1;
1594 /* Targets must be able to place spill slots at lower addresses. If the
1595 target already uses a soft frame pointer, the transition is trivial. */
1596 if (!FRAME_GROWS_DOWNWARD
&& flag_stack_protect
)
1598 warning (0, "-fstack-protector not supported for this target");
1599 flag_stack_protect
= 0;
1601 if (!flag_stack_protect
)
1602 warn_stack_protect
= 0;
1604 /* ??? Unwind info is not correct around the CFG unless either a frame
1605 pointer is present or A_O_A is set. Fixing this requires rewriting
1606 unwind info generation to be aware of the CFG and propagating states
1608 if (flag_unwind_tables
&& !ACCUMULATE_OUTGOING_ARGS
1609 && flag_omit_frame_pointer
)
1611 warning (0, "unwind tables currently require a frame pointer "
1613 flag_omit_frame_pointer
= 0;
1616 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1617 have not been set. */
1618 if (!global_options_set
.x_warnings_are_errors
1619 && warn_coverage_mismatch
1620 && (global_dc
->classify_diagnostic
[OPT_Wcoverage_mismatch
] ==
1622 diagnostic_classify_diagnostic (global_dc
, OPT_Wcoverage_mismatch
,
1623 DK_ERROR
, UNKNOWN_LOCATION
);
1625 /* Save the current optimization options. */
1626 optimization_default_node
= build_optimization_node ();
1627 optimization_current_node
= optimization_default_node
;
1630 /* This function can be called multiple times to reinitialize the compiler
1631 back end when register classes or instruction sets have changed,
1632 before each function. */
1634 backend_init_target (void)
1636 /* Initialize alignment variables. */
1639 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
1640 to initialize reg_raw_mode[]. */
1643 /* This invokes target hooks to set fixed_reg[] etc, which is
1647 /* This depends on stack_pointer_rtx. */
1648 init_fake_stack_mems ();
1650 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1652 init_alias_target ();
1654 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1657 /* The following initialization functions need to generate rtl, so
1658 provide a dummy function context for them. */
1659 init_dummy_function_start ();
1661 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1662 on a mode change. */
1665 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1666 after a mode change as well. */
1667 caller_save_initialized_p
= false;
1669 expand_dummy_function_end ();
1672 /* Initialize the compiler back end. This function is called only once,
1673 when starting the compiler. */
1680 init_inline_once ();
1681 init_varasm_once ();
1682 save_register_info ();
1684 /* Initialize the target-specific back end pieces. */
1686 backend_init_target ();
1689 /* Initialize excess precision settings. */
1691 init_excess_precision (void)
1693 /* Adjust excess precision handling based on the target options. If
1694 the front end cannot handle it, flag_excess_precision_cmdline
1695 will already have been set accordingly in the post_options
1697 gcc_assert (flag_excess_precision_cmdline
!= EXCESS_PRECISION_DEFAULT
);
1698 flag_excess_precision
= flag_excess_precision_cmdline
;
1699 if (flag_unsafe_math_optimizations
)
1700 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1701 if (flag_excess_precision
== EXCESS_PRECISION_STANDARD
)
1703 int flt_eval_method
= TARGET_FLT_EVAL_METHOD
;
1704 switch (flt_eval_method
)
1708 /* Either the target acts unpredictably (-1) or has all the
1709 operations required not to have excess precision (0). */
1710 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1714 /* In these cases, predictable excess precision makes
1718 /* Any other implementation-defined FLT_EVAL_METHOD values
1719 require the compiler to handle the associated excess
1720 precision rules in excess_precision_type. */
1726 /* Initialize things that are both lang-dependent and target-dependent.
1727 This function can be called more than once if target parameters change. */
1729 lang_dependent_init_target (void)
1731 /* This determines excess precision settings. */
1732 init_excess_precision ();
1734 /* This creates various _DECL nodes, so needs to be called after the
1735 front end is initialized. It also depends on the HAVE_xxx macros
1736 generated from the target machine description. */
1739 /* The following initialization functions need to generate rtl, so
1740 provide a dummy function context for them. */
1741 init_dummy_function_start ();
1743 /* Do the target-specific parts of expr initialization. */
1744 init_expr_target ();
1746 /* Although the actions of these functions are language-independent,
1747 they use optabs, so we cannot call them from backend_init. */
1751 expand_dummy_function_end ();
1754 /* Language-dependent initialization. Returns nonzero on success. */
1756 lang_dependent_init (const char *name
)
1758 location_t save_loc
= input_location
;
1759 if (dump_base_name
== 0)
1760 dump_base_name
= name
&& name
[0] ? name
: "gccdump";
1762 /* Other front-end initialization. */
1763 input_location
= BUILTINS_LOCATION
;
1764 if (lang_hooks
.init () == 0)
1766 input_location
= save_loc
;
1770 init_asm_output (name
);
1772 /* If stack usage information is desired, open the output file. */
1773 if (flag_stack_usage
)
1774 stack_usage_file
= open_auxiliary_file ("su");
1777 /* This creates various _DECL nodes, so needs to be called after the
1778 front end is initialized. */
1781 /* Do the target-specific parts of the initialization. */
1782 lang_dependent_init_target ();
1786 /* If dbx symbol table desired, initialize writing it and output the
1787 predefined types. */
1788 timevar_push (TV_SYMOUT
);
1790 /* Now we have the correct original filename, we can initialize
1792 (*debug_hooks
->init
) (name
);
1794 timevar_pop (TV_SYMOUT
);
1801 /* Reinitialize everything when target parameters, such as register usage,
1804 target_reinit (void)
1806 struct rtl_data saved_x_rtl
;
1807 rtx
*saved_regno_reg_rtx
;
1809 /* Save *crtl and regno_reg_rtx around the reinitialization
1810 to allow target_reinit being called even after prepare_function_start. */
1811 saved_regno_reg_rtx
= regno_reg_rtx
;
1812 if (saved_regno_reg_rtx
)
1814 saved_x_rtl
= *crtl
;
1815 memset (crtl
, '\0', sizeof (*crtl
));
1816 regno_reg_rtx
= NULL
;
1819 /* Reinitialize RTL backend. */
1820 backend_init_target ();
1822 /* Reinitialize lang-dependent parts. */
1823 lang_dependent_init_target ();
1825 /* And restore it at the end, as free_after_compilation from
1826 expand_dummy_function_end clears it. */
1827 if (saved_regno_reg_rtx
)
1829 *crtl
= saved_x_rtl
;
1830 regno_reg_rtx
= saved_regno_reg_rtx
;
1831 saved_regno_reg_rtx
= NULL
;
1836 dump_memory_report (bool final
)
1838 dump_line_table_statistics ();
1839 ggc_print_statistics ();
1840 stringpool_statistics ();
1841 dump_tree_statistics ();
1842 dump_gimple_statistics ();
1843 dump_rtx_statistics ();
1844 dump_alloc_pool_statistics ();
1845 dump_bitmap_statistics ();
1846 dump_vec_loc_statistics ();
1847 dump_ggc_loc_statistics (final
);
1848 dump_alias_stats (stderr
);
1849 dump_pta_stats (stderr
);
1852 /* Clean up: close opened files, etc. */
1855 finalize (bool no_backend
)
1857 /* Close the dump files. */
1858 if (flag_gen_aux_info
)
1860 fclose (aux_info_file
);
1862 unlink (aux_info_file_name
);
1865 /* Close non-debugging input and output files. Take special care to note
1866 whether fclose returns an error, since the pages might still be on the
1867 buffer chain while the file is open. */
1871 if (ferror (asm_out_file
) != 0)
1872 fatal_error ("error writing to %s: %m", asm_file_name
);
1873 if (fclose (asm_out_file
) != 0)
1874 fatal_error ("error closing %s: %m", asm_file_name
);
1877 if (stack_usage_file
)
1878 fclose (stack_usage_file
);
1884 finish_optimization_passes ();
1890 dump_memory_report (true);
1892 /* Language-specific end of compilation actions. */
1893 lang_hooks
.finish ();
1896 /* Initialize the compiler, and compile the input file. */
1900 /* Initialize timing first. The C front ends read the main file in
1901 the post_options hook, and C++ does file timings. */
1902 if (time_report
|| !quiet_flag
|| flag_detailed_statistics
)
1904 timevar_start (TV_TOTAL
);
1908 /* Don't do any more if an error has already occurred. */
1911 timevar_start (TV_PHASE_SETUP
);
1913 /* This must be run always, because it is needed to compute the FP
1914 predefined macros, such as __LDBL_MAX__, for targets using non
1915 default FP formats. */
1916 init_adjust_machine_modes ();
1918 /* Set up the back-end if requested. */
1922 /* Language-dependent initialization. Returns true on success. */
1923 if (lang_dependent_init (main_input_filename
))
1925 /* Initialize yet another pass. */
1927 ggc_protect_identifiers
= true;
1930 init_final (main_input_filename
);
1931 coverage_init (aux_base_name
);
1933 invoke_plugin_callbacks (PLUGIN_START_UNIT
, NULL
);
1935 timevar_stop (TV_PHASE_SETUP
);
1941 timevar_stop (TV_PHASE_SETUP
);
1944 timevar_start (TV_PHASE_FINALIZE
);
1946 finalize (no_backend
);
1948 timevar_stop (TV_PHASE_FINALIZE
);
1951 /* Stop timing and print the times. */
1952 timevar_stop (TV_TOTAL
);
1953 timevar_print (stderr
);
1956 /* Entry point of cc1, cc1plus, jc1, f771, etc.
1957 Exit code is FATAL_EXIT_CODE if can't open files or if there were
1958 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
1960 It is not safe to call this function more than once. */
1963 toplev_main (int argc
, char **argv
)
1965 /* Parsing and gimplification sometimes need quite large stack.
1966 Increase stack size limits if possible. */
1967 stack_limit_increase (64 * 1024 * 1024);
1969 expandargv (&argc
, &argv
);
1971 /* Initialization of GCC's environment, and diagnostics. */
1972 general_init (argv
[0]);
1974 /* One-off initialization of options that does not need to be
1975 repeated when options are added for particular functions. */
1976 init_options_once ();
1978 /* Initialize global options structures; this must be repeated for
1979 each structure used for parsing options. */
1980 init_options_struct (&global_options
, &global_options_set
);
1981 lang_hooks
.init_options_struct (&global_options
);
1983 /* Convert the options to an array. */
1984 decode_cmdline_options_to_array_default_mask (argc
,
1985 CONST_CAST2 (const char **,
1987 &save_decoded_options
,
1988 &save_decoded_options_count
);
1990 /* Perform language-specific options initialization. */
1991 lang_hooks
.init_options (save_decoded_options_count
, save_decoded_options
);
1993 /* Parse the options and do minimal processing; basically just
1994 enough to default flags appropriately. */
1995 decode_options (&global_options
, &global_options_set
,
1996 save_decoded_options
, save_decoded_options_count
,
1997 UNKNOWN_LOCATION
, global_dc
);
1999 handle_common_deferred_options ();
2003 initialize_plugins ();
2006 print_version (stderr
, "");
2009 print_plugins_help (stderr
, "");
2011 /* Exit early if we can (e.g. -help). */
2012 if (!exit_after_options
)
2015 if (warningcount
|| errorcount
)
2016 print_ignored_options ();
2017 diagnostic_finish (global_dc
);
2019 /* Invoke registered plugin callbacks if any. */
2020 invoke_plugin_callbacks (PLUGIN_FINISH
, NULL
);
2022 finalize_plugins ();
2024 return (FATAL_EXIT_CODE
);
2026 return (SUCCESS_EXIT_CODE
);