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_flatten
1319 || flag_loop_interchange
1320 || flag_loop_strip_mine
1321 || flag_loop_parallelize_all
)
1322 sorry ("Graphite loop optimizations cannot be used (-fgraphite, "
1323 "-fgraphite-identity, -floop-block, -floop-flatten, "
1324 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1325 "and -ftree-loop-linear)");
1328 if (flag_mudflap
&& flag_lto
)
1329 sorry ("mudflap cannot be used together with link-time optimization");
1331 /* One region RA really helps to decrease the code size. */
1332 if (flag_ira_region
== IRA_REGION_AUTODETECT
)
1334 = optimize_size
|| !optimize
? IRA_REGION_ONE
: IRA_REGION_MIXED
;
1336 if (flag_strict_volatile_bitfields
> 0 && !abi_version_at_least (2))
1338 warning (0, "-fstrict-volatile-bitfields disabled; "
1339 "it is incompatible with ABI versions < 2");
1340 flag_strict_volatile_bitfields
= 0;
1343 /* Unrolling all loops implies that standard loop unrolling must also
1345 if (flag_unroll_all_loops
)
1346 flag_unroll_loops
= 1;
1348 /* web and rename-registers help when run after loop unrolling. */
1349 if (flag_web
== AUTODETECT_VALUE
)
1350 flag_web
= flag_unroll_loops
|| flag_peel_loops
;
1352 if (flag_rename_registers
== AUTODETECT_VALUE
)
1353 flag_rename_registers
= flag_unroll_loops
|| flag_peel_loops
;
1355 if (flag_non_call_exceptions
)
1356 flag_asynchronous_unwind_tables
= 1;
1357 if (flag_asynchronous_unwind_tables
)
1358 flag_unwind_tables
= 1;
1360 if (flag_value_profile_transformations
)
1361 flag_profile_values
= 1;
1363 /* Warn about options that are not supported on this machine. */
1364 #ifndef INSN_SCHEDULING
1365 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
1366 warning (0, "instruction scheduling not supported on this target machine");
1369 if (flag_delayed_branch
)
1370 warning (0, "this target machine does not have delayed branches");
1373 user_label_prefix
= USER_LABEL_PREFIX
;
1374 if (flag_leading_underscore
!= -1)
1376 /* If the default prefix is more complicated than "" or "_",
1377 issue a warning and ignore this option. */
1378 if (user_label_prefix
[0] == 0 ||
1379 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
1381 user_label_prefix
= flag_leading_underscore
? "_" : "";
1384 warning (0, "-f%sleading-underscore not supported on this target machine",
1385 flag_leading_underscore
? "" : "no-");
1388 /* If we are in verbose mode, write out the version and maybe all the
1389 option flags in use. */
1392 print_version (stderr
, "");
1394 print_switch_values (print_to_stderr
);
1397 if (flag_syntax_only
)
1399 write_symbols
= NO_DEBUG
;
1405 if (debug_info_level
== DINFO_LEVEL_NONE
)
1407 debug_info_level
= DINFO_LEVEL_NORMAL
;
1409 if (write_symbols
== NO_DEBUG
)
1410 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
1413 debug_info_level
= DINFO_LEVEL_NONE
;
1416 if (flag_dump_final_insns
&& !flag_syntax_only
&& !no_backend
)
1418 FILE *final_output
= fopen (flag_dump_final_insns
, "w");
1421 error ("could not open final insn dump file %qs: %m",
1422 flag_dump_final_insns
);
1423 flag_dump_final_insns
= NULL
;
1425 else if (fclose (final_output
))
1427 error ("could not close zeroed insn dump file %qs: %m",
1428 flag_dump_final_insns
);
1429 flag_dump_final_insns
= NULL
;
1433 /* Unless over-ridden for the target, assume that all DWARF levels
1434 may be emitted, if DWARF2_DEBUG is selected. */
1435 if (dwarf_strict
< 0)
1438 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1440 if (debug_info_level
== DINFO_LEVEL_NONE
)
1441 write_symbols
= NO_DEBUG
;
1443 if (write_symbols
== NO_DEBUG
)
1445 #if defined(DBX_DEBUGGING_INFO)
1446 else if (write_symbols
== DBX_DEBUG
)
1447 debug_hooks
= &dbx_debug_hooks
;
1449 #if defined(XCOFF_DEBUGGING_INFO)
1450 else if (write_symbols
== XCOFF_DEBUG
)
1451 debug_hooks
= &xcoff_debug_hooks
;
1453 #ifdef SDB_DEBUGGING_INFO
1454 else if (write_symbols
== SDB_DEBUG
)
1455 debug_hooks
= &sdb_debug_hooks
;
1457 #ifdef DWARF2_DEBUGGING_INFO
1458 else if (write_symbols
== DWARF2_DEBUG
)
1459 debug_hooks
= &dwarf2_debug_hooks
;
1461 #ifdef VMS_DEBUGGING_INFO
1462 else if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1463 debug_hooks
= &vmsdbg_debug_hooks
;
1466 error ("target system does not support the \"%s\" debug format",
1467 debug_type_names
[write_symbols
]);
1469 /* We know which debug output will be used so we can set flag_var_tracking
1470 and flag_var_tracking_uninit if the user has not specified them. */
1471 if (debug_info_level
< DINFO_LEVEL_NORMAL
1472 || debug_hooks
->var_location
== do_nothing_debug_hooks
.var_location
)
1474 if (flag_var_tracking
== 1
1475 || flag_var_tracking_uninit
== 1)
1477 if (debug_info_level
< DINFO_LEVEL_NORMAL
)
1478 warning (0, "variable tracking requested, but useless unless "
1479 "producing debug info");
1481 warning (0, "variable tracking requested, but not supported "
1482 "by this debug format");
1484 flag_var_tracking
= 0;
1485 flag_var_tracking_uninit
= 0;
1488 /* The debug hooks are used to implement -fdump-go-spec because it
1489 gives a simple and stable API for all the information we need to
1491 if (flag_dump_go_spec
!= NULL
)
1492 debug_hooks
= dump_go_spec_init (flag_dump_go_spec
, debug_hooks
);
1494 /* If the user specifically requested variable tracking with tagging
1495 uninitialized variables, we need to turn on variable tracking.
1496 (We already determined above that variable tracking is feasible.) */
1497 if (flag_var_tracking_uninit
)
1498 flag_var_tracking
= 1;
1500 if (flag_var_tracking
== AUTODETECT_VALUE
)
1501 flag_var_tracking
= optimize
>= 1;
1503 if (flag_var_tracking_assignments
== AUTODETECT_VALUE
)
1504 flag_var_tracking_assignments
= flag_var_tracking
1505 && !(flag_selective_scheduling
|| flag_selective_scheduling2
);
1507 if (flag_var_tracking_assignments_toggle
)
1508 flag_var_tracking_assignments
= !flag_var_tracking_assignments
;
1510 if (flag_var_tracking_assignments
&& !flag_var_tracking
)
1511 flag_var_tracking
= flag_var_tracking_assignments
= -1;
1513 if (flag_var_tracking_assignments
1514 && (flag_selective_scheduling
|| flag_selective_scheduling2
))
1515 warning (0, "var-tracking-assignments changes selective scheduling");
1517 if (flag_tree_cselim
== AUTODETECT_VALUE
)
1518 #ifdef HAVE_conditional_move
1519 flag_tree_cselim
= 1;
1521 flag_tree_cselim
= 0;
1524 /* If auxiliary info generation is desired, open the output file.
1525 This goes in the same directory as the source file--unlike
1526 all the other output files. */
1527 if (flag_gen_aux_info
)
1529 aux_info_file
= fopen (aux_info_file_name
, "w");
1530 if (aux_info_file
== 0)
1531 fatal_error ("can%'t open %s: %m", aux_info_file_name
);
1534 if (!targetm_common
.have_named_sections
)
1536 if (flag_function_sections
)
1538 warning (0, "-ffunction-sections not supported for this target");
1539 flag_function_sections
= 0;
1541 if (flag_data_sections
)
1543 warning (0, "-fdata-sections not supported for this target");
1544 flag_data_sections
= 0;
1548 if (flag_function_sections
&& profile_flag
)
1550 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
1551 flag_function_sections
= 0;
1554 #ifndef HAVE_prefetch
1555 if (flag_prefetch_loop_arrays
> 0)
1557 warning (0, "-fprefetch-loop-arrays not supported for this target");
1558 flag_prefetch_loop_arrays
= 0;
1561 if (flag_prefetch_loop_arrays
> 0 && !HAVE_prefetch
)
1563 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1564 flag_prefetch_loop_arrays
= 0;
1568 /* This combination of options isn't handled for i386 targets and doesn't
1569 make much sense anyway, so don't allow it. */
1570 if (flag_prefetch_loop_arrays
> 0 && optimize_size
)
1572 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1573 flag_prefetch_loop_arrays
= 0;
1576 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1577 if (flag_signaling_nans
)
1578 flag_trapping_math
= 1;
1580 /* We cannot reassociate if we want traps or signed zeros. */
1581 if (flag_associative_math
&& (flag_trapping_math
|| flag_signed_zeros
))
1583 warning (0, "-fassociative-math disabled; other options take precedence");
1584 flag_associative_math
= 0;
1587 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1588 if (flag_cx_limited_range
)
1589 flag_complex_method
= 0;
1591 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1592 if (flag_cx_fortran_rules
)
1593 flag_complex_method
= 1;
1595 /* Targets must be able to place spill slots at lower addresses. If the
1596 target already uses a soft frame pointer, the transition is trivial. */
1597 if (!FRAME_GROWS_DOWNWARD
&& flag_stack_protect
)
1599 warning (0, "-fstack-protector not supported for this target");
1600 flag_stack_protect
= 0;
1602 if (!flag_stack_protect
)
1603 warn_stack_protect
= 0;
1605 /* ??? Unwind info is not correct around the CFG unless either a frame
1606 pointer is present or A_O_A is set. Fixing this requires rewriting
1607 unwind info generation to be aware of the CFG and propagating states
1609 if (flag_unwind_tables
&& !ACCUMULATE_OUTGOING_ARGS
1610 && flag_omit_frame_pointer
)
1612 warning (0, "unwind tables currently require a frame pointer "
1614 flag_omit_frame_pointer
= 0;
1617 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1618 have not been set. */
1619 if (!global_options_set
.x_warnings_are_errors
1620 && warn_coverage_mismatch
1621 && (global_dc
->classify_diagnostic
[OPT_Wcoverage_mismatch
] ==
1623 diagnostic_classify_diagnostic (global_dc
, OPT_Wcoverage_mismatch
,
1624 DK_ERROR
, UNKNOWN_LOCATION
);
1626 /* Save the current optimization options. */
1627 optimization_default_node
= build_optimization_node ();
1628 optimization_current_node
= optimization_default_node
;
1631 /* This function can be called multiple times to reinitialize the compiler
1632 back end when register classes or instruction sets have changed,
1633 before each function. */
1635 backend_init_target (void)
1637 /* Initialize alignment variables. */
1640 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
1641 to initialize reg_raw_mode[]. */
1644 /* This invokes target hooks to set fixed_reg[] etc, which is
1648 /* This depends on stack_pointer_rtx. */
1649 init_fake_stack_mems ();
1651 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1653 init_alias_target ();
1655 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1658 /* The following initialization functions need to generate rtl, so
1659 provide a dummy function context for them. */
1660 init_dummy_function_start ();
1662 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1663 on a mode change. */
1666 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1667 after a mode change as well. */
1668 caller_save_initialized_p
= false;
1670 expand_dummy_function_end ();
1673 /* Initialize the compiler back end. This function is called only once,
1674 when starting the compiler. */
1681 init_inline_once ();
1682 init_varasm_once ();
1683 save_register_info ();
1685 /* Initialize the target-specific back end pieces. */
1687 backend_init_target ();
1690 /* Initialize excess precision settings. */
1692 init_excess_precision (void)
1694 /* Adjust excess precision handling based on the target options. If
1695 the front end cannot handle it, flag_excess_precision_cmdline
1696 will already have been set accordingly in the post_options
1698 gcc_assert (flag_excess_precision_cmdline
!= EXCESS_PRECISION_DEFAULT
);
1699 flag_excess_precision
= flag_excess_precision_cmdline
;
1700 if (flag_unsafe_math_optimizations
)
1701 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1702 if (flag_excess_precision
== EXCESS_PRECISION_STANDARD
)
1704 int flt_eval_method
= TARGET_FLT_EVAL_METHOD
;
1705 switch (flt_eval_method
)
1709 /* Either the target acts unpredictably (-1) or has all the
1710 operations required not to have excess precision (0). */
1711 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1715 /* In these cases, predictable excess precision makes
1719 /* Any other implementation-defined FLT_EVAL_METHOD values
1720 require the compiler to handle the associated excess
1721 precision rules in excess_precision_type. */
1727 /* Initialize things that are both lang-dependent and target-dependent.
1728 This function can be called more than once if target parameters change. */
1730 lang_dependent_init_target (void)
1732 /* This determines excess precision settings. */
1733 init_excess_precision ();
1735 /* This creates various _DECL nodes, so needs to be called after the
1736 front end is initialized. It also depends on the HAVE_xxx macros
1737 generated from the target machine description. */
1740 /* The following initialization functions need to generate rtl, so
1741 provide a dummy function context for them. */
1742 init_dummy_function_start ();
1744 /* Do the target-specific parts of expr initialization. */
1745 init_expr_target ();
1747 /* Although the actions of these functions are language-independent,
1748 they use optabs, so we cannot call them from backend_init. */
1752 expand_dummy_function_end ();
1755 /* Language-dependent initialization. Returns nonzero on success. */
1757 lang_dependent_init (const char *name
)
1759 location_t save_loc
= input_location
;
1760 if (dump_base_name
== 0)
1761 dump_base_name
= name
&& name
[0] ? name
: "gccdump";
1763 /* Other front-end initialization. */
1764 input_location
= BUILTINS_LOCATION
;
1765 if (lang_hooks
.init () == 0)
1767 input_location
= save_loc
;
1771 init_asm_output (name
);
1773 /* If stack usage information is desired, open the output file. */
1774 if (flag_stack_usage
)
1775 stack_usage_file
= open_auxiliary_file ("su");
1778 /* This creates various _DECL nodes, so needs to be called after the
1779 front end is initialized. */
1782 /* Do the target-specific parts of the initialization. */
1783 lang_dependent_init_target ();
1787 /* If dbx symbol table desired, initialize writing it and output the
1788 predefined types. */
1789 timevar_push (TV_SYMOUT
);
1791 /* Now we have the correct original filename, we can initialize
1793 (*debug_hooks
->init
) (name
);
1795 timevar_pop (TV_SYMOUT
);
1802 /* Reinitialize everything when target parameters, such as register usage,
1805 target_reinit (void)
1807 struct rtl_data saved_x_rtl
;
1808 rtx
*saved_regno_reg_rtx
;
1810 /* Save *crtl and regno_reg_rtx around the reinitialization
1811 to allow target_reinit being called even after prepare_function_start. */
1812 saved_regno_reg_rtx
= regno_reg_rtx
;
1813 if (saved_regno_reg_rtx
)
1815 saved_x_rtl
= *crtl
;
1816 memset (crtl
, '\0', sizeof (*crtl
));
1817 regno_reg_rtx
= NULL
;
1820 /* Reinitialize RTL backend. */
1821 backend_init_target ();
1823 /* Reinitialize lang-dependent parts. */
1824 lang_dependent_init_target ();
1826 /* And restore it at the end, as free_after_compilation from
1827 expand_dummy_function_end clears it. */
1828 if (saved_regno_reg_rtx
)
1830 *crtl
= saved_x_rtl
;
1831 regno_reg_rtx
= saved_regno_reg_rtx
;
1832 saved_regno_reg_rtx
= NULL
;
1837 dump_memory_report (bool final
)
1839 dump_line_table_statistics ();
1840 ggc_print_statistics ();
1841 stringpool_statistics ();
1842 dump_tree_statistics ();
1843 dump_gimple_statistics ();
1844 dump_rtx_statistics ();
1845 dump_alloc_pool_statistics ();
1846 dump_bitmap_statistics ();
1847 dump_vec_loc_statistics ();
1848 dump_ggc_loc_statistics (final
);
1849 dump_alias_stats (stderr
);
1850 dump_pta_stats (stderr
);
1853 /* Clean up: close opened files, etc. */
1856 finalize (bool no_backend
)
1858 /* Close the dump files. */
1859 if (flag_gen_aux_info
)
1861 fclose (aux_info_file
);
1863 unlink (aux_info_file_name
);
1866 /* Close non-debugging input and output files. Take special care to note
1867 whether fclose returns an error, since the pages might still be on the
1868 buffer chain while the file is open. */
1872 if (ferror (asm_out_file
) != 0)
1873 fatal_error ("error writing to %s: %m", asm_file_name
);
1874 if (fclose (asm_out_file
) != 0)
1875 fatal_error ("error closing %s: %m", asm_file_name
);
1878 if (stack_usage_file
)
1879 fclose (stack_usage_file
);
1885 finish_optimization_passes ();
1891 dump_memory_report (true);
1893 /* Language-specific end of compilation actions. */
1894 lang_hooks
.finish ();
1897 /* Initialize the compiler, and compile the input file. */
1901 /* Initialize timing first. The C front ends read the main file in
1902 the post_options hook, and C++ does file timings. */
1903 if (time_report
|| !quiet_flag
|| flag_detailed_statistics
)
1905 timevar_start (TV_TOTAL
);
1909 /* Don't do any more if an error has already occurred. */
1912 timevar_start (TV_PHASE_SETUP
);
1914 /* This must be run always, because it is needed to compute the FP
1915 predefined macros, such as __LDBL_MAX__, for targets using non
1916 default FP formats. */
1917 init_adjust_machine_modes ();
1919 /* Set up the back-end if requested. */
1923 /* Language-dependent initialization. Returns true on success. */
1924 if (lang_dependent_init (main_input_filename
))
1926 /* Initialize yet another pass. */
1928 ggc_protect_identifiers
= true;
1931 init_final (main_input_filename
);
1932 coverage_init (aux_base_name
);
1934 invoke_plugin_callbacks (PLUGIN_START_UNIT
, NULL
);
1936 timevar_stop (TV_PHASE_SETUP
);
1942 timevar_stop (TV_PHASE_SETUP
);
1945 timevar_start (TV_PHASE_FINALIZE
);
1947 finalize (no_backend
);
1949 timevar_stop (TV_PHASE_FINALIZE
);
1952 /* Stop timing and print the times. */
1953 timevar_stop (TV_TOTAL
);
1954 timevar_print (stderr
);
1957 /* Entry point of cc1, cc1plus, jc1, f771, etc.
1958 Exit code is FATAL_EXIT_CODE if can't open files or if there were
1959 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
1961 It is not safe to call this function more than once. */
1964 toplev_main (int argc
, char **argv
)
1966 /* Parsing and gimplification sometimes need quite large stack.
1967 Increase stack size limits if possible. */
1968 stack_limit_increase (64 * 1024 * 1024);
1970 expandargv (&argc
, &argv
);
1972 /* Initialization of GCC's environment, and diagnostics. */
1973 general_init (argv
[0]);
1975 /* One-off initialization of options that does not need to be
1976 repeated when options are added for particular functions. */
1977 init_options_once ();
1979 /* Initialize global options structures; this must be repeated for
1980 each structure used for parsing options. */
1981 init_options_struct (&global_options
, &global_options_set
);
1982 lang_hooks
.init_options_struct (&global_options
);
1984 /* Convert the options to an array. */
1985 decode_cmdline_options_to_array_default_mask (argc
,
1986 CONST_CAST2 (const char **,
1988 &save_decoded_options
,
1989 &save_decoded_options_count
);
1991 /* Perform language-specific options initialization. */
1992 lang_hooks
.init_options (save_decoded_options_count
, save_decoded_options
);
1994 /* Parse the options and do minimal processing; basically just
1995 enough to default flags appropriately. */
1996 decode_options (&global_options
, &global_options_set
,
1997 save_decoded_options
, save_decoded_options_count
,
1998 UNKNOWN_LOCATION
, global_dc
);
2000 handle_common_deferred_options ();
2004 initialize_plugins ();
2007 print_version (stderr
, "");
2010 print_plugins_help (stderr
, "");
2012 /* Exit early if we can (e.g. -help). */
2013 if (!exit_after_options
)
2016 if (warningcount
|| errorcount
)
2017 print_ignored_options ();
2018 diagnostic_finish (global_dc
);
2020 /* Invoke registered plugin callbacks if any. */
2021 invoke_plugin_callbacks (PLUGIN_FINISH
, NULL
);
2023 finalize_plugins ();
2025 return (FATAL_EXIT_CODE
);
2027 return (SUCCESS_EXIT_CODE
);