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 "langhooks.h"
66 #include "cfglayout.h"
68 #include "hosthooks.h"
71 #include "opts-diagnostic.h"
73 #include "value-prof.h"
74 #include "alloc-pool.h"
75 #include "tree-mudflap.h"
76 #include "tree-pass.h"
78 #include "tree-ssa-alias.h"
81 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
82 #include "dwarf2out.h"
85 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
89 #ifdef SDB_DEBUGGING_INFO
93 #ifdef XCOFF_DEBUGGING_INFO
94 #include "xcoffout.h" /* Needed for external data
95 declarations for e.g. AIX 4.x. */
98 static void general_init (const char *);
99 static void do_compile (void);
100 static void process_options (void);
101 static void backend_init (void);
102 static int lang_dependent_init (const char *);
103 static void init_asm_output (const char *);
104 static void finalize (bool);
106 static void crash_signal (int) ATTRIBUTE_NORETURN
;
107 static void compile_file (void);
109 /* True if we don't need a backend (e.g. preprocessing only). */
110 static bool no_backend
;
112 /* Length of line when printing switch values. */
115 /* Decoded options, and number of such options. */
116 struct cl_decoded_option
*save_decoded_options
;
117 unsigned int save_decoded_options_count
;
119 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
120 to optimize in process_options (). */
121 #define AUTODETECT_VALUE 2
123 /* Debug hooks - dependent upon command line options. */
125 const struct gcc_debug_hooks
*debug_hooks
;
127 /* True if this is the lto front end. This is used to disable
128 gimple generation and lowering passes that are normally run on the
129 output of a front end. These passes must be bypassed for lto since
130 they have already been done before the gimple was written. */
132 bool in_lto_p
= false;
134 /* The FUNCTION_DECL for the function currently being compiled,
135 or 0 if between functions. */
136 tree current_function_decl
;
138 /* Set to the FUNC_BEGIN label of the current function, or NULL
140 const char * current_function_func_begin_label
;
142 /* A random sequence of characters, unless overridden by user. */
143 static const char *flag_random_seed
;
145 /* A local time stamp derived from the time of compilation. It will be
146 zero if the system cannot provide a time. It will be -1u, if the
147 user has specified a particular random seed. */
152 /* Generate code for GNU or NeXT Objective-C runtime environment. */
154 #ifdef NEXT_OBJC_RUNTIME
155 int flag_next_runtime
= 1;
157 int flag_next_runtime
= 0;
160 /* Nonzero means make permerror produce warnings instead of errors. */
162 int flag_permissive
= 0;
164 /* When non-NULL, indicates that whenever space is allocated on the
165 stack, the resulting stack pointer must not pass this
166 address---that is, for stacks that grow downward, the stack pointer
167 must always be greater than or equal to this address; for stacks
168 that grow upward, the stack pointer must be less than this address.
169 At present, the rtx may be either a REG or a SYMBOL_REF, although
170 the support provided depends on the backend. */
173 /* True if the user has tagged the function with the 'section'
176 bool user_defined_section_attribute
= false;
178 struct target_flag_state default_target_flag_state
;
179 #if SWITCHABLE_TARGET
180 struct target_flag_state
*this_target_flag_state
= &default_target_flag_state
;
182 #define this_target_flag_state (&default_target_flag_state)
187 const char *const string
;
191 lang_independent_options
;
193 /* The user symbol prefix after having resolved same. */
194 const char *user_label_prefix
;
196 static const param_info lang_independent_params
[] = {
197 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
198 { OPTION, DEFAULT, MIN, MAX, HELP },
199 #include "params.def"
201 { NULL
, 0, 0, 0, NULL
}
204 /* Output files for assembler code (real compiler output)
205 and debugging dumps. */
209 FILE *stack_usage_file
= NULL
;
210 FILE *dump_file
= NULL
;
211 const char *dump_file_name
;
213 /* The current working directory of a translation. It's generally the
214 directory from which compilation was initiated, but a preprocessed
215 file may specify the original directory in which it was
218 static const char *src_pwd
;
220 /* Initialize src_pwd with the given string, and return true. If it
221 was already initialized, return false. As a special case, it may
222 be called with a NULL argument to test whether src_pwd has NOT been
226 set_src_pwd (const char *pwd
)
230 if (strcmp (src_pwd
, pwd
) == 0)
236 src_pwd
= xstrdup (pwd
);
240 /* Return the directory from which the translation unit was initiated,
241 in case set_src_pwd() was not called before to assign it a
257 /* Called when the start of a function definition is parsed,
258 this function prints on stderr the name of the function. */
260 announce_function (tree decl
)
264 if (rtl_dump_and_exit
)
265 fprintf (stderr
, "%s ",
266 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl
))));
268 fprintf (stderr
, " %s",
269 identifier_to_locale (lang_hooks
.decl_printable_name (decl
, 2)));
271 pp_needs_newline (global_dc
->printer
) = true;
272 diagnostic_set_last_function (global_dc
, (diagnostic_info
*) NULL
);
276 /* Initialize local_tick with the time of day, or -1 if
277 flag_random_seed is set. */
280 init_local_tick (void)
282 if (!flag_random_seed
)
284 /* Get some more or less random data. */
285 #ifdef HAVE_GETTIMEOFDAY
289 gettimeofday (&tv
, NULL
);
290 local_tick
= tv
.tv_sec
* 1000 + tv
.tv_usec
/ 1000;
294 time_t now
= time (NULL
);
296 if (now
!= (time_t)-1)
297 local_tick
= (unsigned) now
;
305 /* Set up a default flag_random_seed and local_tick, unless the user
306 already specified one. Must be called after init_local_tick. */
309 init_random_seed (void)
311 unsigned HOST_WIDE_INT value
;
312 static char random_seed
[HOST_BITS_PER_WIDE_INT
/ 4 + 3];
314 value
= local_tick
^ getpid ();
316 sprintf (random_seed
, HOST_WIDE_INT_PRINT_HEX
, value
);
317 flag_random_seed
= random_seed
;
320 /* Obtain the random_seed string. Unless NOINIT, initialize it if
321 it's not provided in the command line. */
324 get_random_seed (bool noinit
)
326 if (!flag_random_seed
&& !noinit
)
328 return flag_random_seed
;
331 /* Modify the random_seed string to VAL. Return its previous
335 set_random_seed (const char *val
)
337 const char *old
= flag_random_seed
;
338 flag_random_seed
= val
;
342 /* Handler for fatal signals, such as SIGSEGV. These are transformed
343 into ICE messages, which is much more user friendly. In case the
344 error printer crashes, reset the signal to prevent infinite recursion. */
347 crash_signal (int signo
)
349 signal (signo
, SIG_DFL
);
351 /* If we crashed while processing an ASM statement, then be a little more
352 graceful. It's most likely the user's fault. */
353 if (this_is_asm_operands
)
355 output_operand_lossage ("unrecoverable error");
356 exit (FATAL_EXIT_CODE
);
359 internal_error ("%s", strsignal (signo
));
362 /* A subroutine of wrapup_global_declarations. We've come to the end of
363 the compilation unit. All deferred variables should be undeferred,
364 and all incomplete decls should be finalized. */
367 wrapup_global_declaration_1 (tree decl
)
369 /* We're not deferring this any longer. Assignment is conditional to
370 avoid needlessly dirtying PCH pages. */
371 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl
), TS_DECL_WITH_VIS
)
372 && DECL_DEFER_OUTPUT (decl
) != 0)
373 DECL_DEFER_OUTPUT (decl
) = 0;
375 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0)
376 lang_hooks
.finish_incomplete_decl (decl
);
379 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
380 needs to be output. Return true if it is output. */
383 wrapup_global_declaration_2 (tree decl
)
385 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
388 /* Don't write out static consts, unless we still need them.
390 We also keep static consts if not optimizing (for debugging),
391 unless the user specified -fno-keep-static-consts.
392 ??? They might be better written into the debug information.
393 This is possible when using DWARF.
395 A language processor that wants static constants to be always
396 written out (even if it is not used) is responsible for
397 calling rest_of_decl_compilation itself. E.g. the C front-end
398 calls rest_of_decl_compilation from finish_decl.
399 One motivation for this is that is conventional in some
400 environments to write things like:
401 static const char rcsid[] = "... version string ...";
402 intending to force the string to be in the executable.
404 A language processor that would prefer to have unneeded
405 static constants "optimized away" would just defer writing
406 them out until here. E.g. C++ does this, because static
407 constants are often defined in header files.
409 ??? A tempting alternative (for both C and C++) would be
410 to force a constant to be written if and only if it is
411 defined in a main file, as opposed to an include file. */
413 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
415 struct varpool_node
*node
;
417 node
= varpool_get_node (decl
);
419 if (!node
&& flag_ltrans
)
421 else if (node
&& node
->finalized
)
423 else if (node
&& node
->alias
)
425 else if (!cgraph_global_info_ready
427 || TREE_USED (DECL_ASSEMBLER_NAME (decl
))))
429 else if (node
&& node
->needed
)
431 else if (DECL_COMDAT (decl
))
433 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
434 && (optimize
|| !flag_keep_static_consts
435 || DECL_ARTIFICIAL (decl
)))
440 rest_of_decl_compilation (decl
, 1, 1);
448 /* Do any final processing required for the declarations in VEC, of
449 which there are LEN. We write out inline functions and variables
450 that have been deferred until this point, but which are required.
451 Returns nonzero if anything was put out. */
454 wrapup_global_declarations (tree
*vec
, int len
)
456 bool reconsider
, output_something
= false;
459 for (i
= 0; i
< len
; i
++)
460 wrapup_global_declaration_1 (vec
[i
]);
462 /* Now emit any global variables or functions that we have been
463 putting off. We need to loop in case one of the things emitted
464 here references another one which comes earlier in the list. */
468 for (i
= 0; i
< len
; i
++)
469 reconsider
|= wrapup_global_declaration_2 (vec
[i
]);
471 output_something
= true;
475 return output_something
;
478 /* A subroutine of check_global_declarations. Issue appropriate warnings
479 for the global declaration DECL. */
482 check_global_declaration_1 (tree decl
)
484 /* Warn about any function declared static but not defined. We don't
485 warn about variables, because many programs have static variables
486 that exist only to get some text into the object file. */
487 if (TREE_CODE (decl
) == FUNCTION_DECL
488 && DECL_INITIAL (decl
) == 0
489 && DECL_EXTERNAL (decl
)
490 && ! DECL_ARTIFICIAL (decl
)
491 && ! TREE_NO_WARNING (decl
)
492 && ! TREE_PUBLIC (decl
)
493 && (warn_unused_function
494 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
496 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
497 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
499 warning (OPT_Wunused_function
, "%q+F declared %<static%> but never defined", decl
);
500 /* This symbol is effectively an "extern" declaration now. */
501 TREE_PUBLIC (decl
) = 1;
502 assemble_external (decl
);
505 /* Warn about static fns or vars defined but not used. */
506 if (((warn_unused_function
&& TREE_CODE (decl
) == FUNCTION_DECL
)
507 /* We don't warn about "static const" variables because the
508 "rcs_id" idiom uses that construction. */
509 || (warn_unused_variable
510 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
511 && ! DECL_IN_SYSTEM_HEADER (decl
)
512 && ! TREE_USED (decl
)
513 /* The TREE_USED bit for file-scope decls is kept in the identifier,
514 to handle multiple external decls in different scopes. */
515 && ! (DECL_NAME (decl
) && TREE_USED (DECL_NAME (decl
)))
516 && ! DECL_EXTERNAL (decl
)
517 && ! TREE_PUBLIC (decl
)
518 /* A volatile variable might be used in some non-obvious way. */
519 && ! TREE_THIS_VOLATILE (decl
)
520 /* Global register variables must be declared to reserve them. */
521 && ! (TREE_CODE (decl
) == VAR_DECL
&& DECL_REGISTER (decl
))
522 /* Otherwise, ask the language. */
523 && lang_hooks
.decls
.warn_unused_global (decl
))
524 warning ((TREE_CODE (decl
) == FUNCTION_DECL
)
525 ? OPT_Wunused_function
526 : OPT_Wunused_variable
,
527 "%q+D defined but not used", decl
);
530 /* Issue appropriate warnings for the global declarations in VEC (of
531 which there are LEN). */
534 check_global_declarations (tree
*vec
, int len
)
538 for (i
= 0; i
< len
; i
++)
539 check_global_declaration_1 (vec
[i
]);
542 /* Emit debugging information for all global declarations in VEC. */
545 emit_debug_global_declarations (tree
*vec
, int len
)
549 /* Avoid confusing the debug information machinery when there are errors. */
553 timevar_push (TV_SYMOUT
);
554 for (i
= 0; i
< len
; i
++)
555 debug_hooks
->global_decl (vec
[i
]);
556 timevar_pop (TV_SYMOUT
);
559 /* Compile an entire translation unit. Write a file of assembly
560 output and various debugging dumps. */
565 /* Initialize yet another pass. */
567 timevar_start (TV_PHASE_PARSING
);
569 ggc_protect_identifiers
= true;
572 init_final (main_input_filename
);
573 coverage_init (aux_base_name
);
575 invoke_plugin_callbacks (PLUGIN_START_UNIT
, NULL
);
577 timevar_push (TV_PARSE_GLOBAL
);
579 /* Call the parser, which parses the entire file (calling
580 rest_of_compilation for each function). */
581 lang_hooks
.parse_file ();
583 /* Compilation is now finished except for writing
584 what's left of the symbol table output. */
585 timevar_pop (TV_PARSE_GLOBAL
);
587 timevar_stop (TV_PHASE_PARSING
);
589 if (flag_syntax_only
|| flag_wpa
)
592 ggc_protect_identifiers
= false;
594 /* This must also call cgraph_finalize_compilation_unit. */
595 lang_hooks
.decls
.final_write_globals ();
600 timevar_start (TV_PHASE_GENERATE
);
602 varpool_assemble_pending_decls ();
605 /* Likewise for mudflap static object registrations. */
607 mudflap_finish_file ();
609 output_shared_constant_pool ();
610 output_object_blocks ();
612 /* Write out any pending weak symbol declarations. */
615 /* This must be at the end before unwind and debug info.
616 Some target ports emit PIC setup thunks here. */
617 targetm
.asm_out
.code_end ();
619 /* Do dbx symbols. */
620 timevar_push (TV_SYMOUT
);
622 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
623 if (dwarf2out_do_frame ())
624 dwarf2out_frame_finish ();
627 (*debug_hooks
->finish
) (main_input_filename
);
628 timevar_pop (TV_SYMOUT
);
630 /* Output some stuff at end of file if nec. */
632 dw2_output_indirect_constants ();
634 /* Flush any pending external directives. */
635 process_pending_assemble_externals ();
637 /* Emit LTO marker if LTO info has been previously emitted. This is
638 used by collect2 to determine whether an object file contains IL.
639 We used to emit an undefined reference here, but this produces
640 link errors if an object file with IL is stored into a shared
641 library without invoking lto1. */
642 if (flag_generate_lto
)
644 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
645 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
,
647 (unsigned HOST_WIDE_INT
) 1, 8);
648 #elif defined ASM_OUTPUT_ALIGNED_COMMON
649 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_v1",
650 (unsigned HOST_WIDE_INT
) 1, 8);
652 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_v1",
653 (unsigned HOST_WIDE_INT
) 1,
654 (unsigned HOST_WIDE_INT
) 1);
658 /* Attach a special .ident directive to the end of the file to identify
659 the version of GCC which compiled this code. The format of the .ident
660 string is patterned after the ones produced by native SVR4 compilers. */
664 const char *pkg_version
= "(GNU) ";
666 if (strcmp ("(GCC) ", pkgversion_string
))
667 pkg_version
= pkgversion_string
;
668 fprintf (asm_out_file
, "%s\"GCC: %s%s\"\n",
669 IDENT_ASM_OP
, pkg_version
, version_string
);
673 /* Invoke registered plugin callbacks. */
674 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT
, NULL
);
676 /* This must be at the end. Some target ports emit end of file directives
677 into the assembly file here, and hence we can not output anything to the
678 assembly file after this point. */
679 targetm
.asm_out
.file_end ();
681 timevar_stop (TV_PHASE_GENERATE
);
684 /* Indexed by enum debug_info_type. */
685 const char *const debug_type_names
[] =
687 "none", "stabs", "coff", "dwarf-2", "xcoff", "vms"
690 /* Print version information to FILE.
691 Each line begins with INDENT (for the case where FILE is the
692 assembler output file). */
695 print_version (FILE *file
, const char *indent
)
697 static const char fmt1
[] =
699 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
701 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
704 static const char fmt2
[] =
705 N_("GMP version %s, MPFR version %s, MPC version %s\n");
706 static const char fmt3
[] =
707 N_("%s%swarning: %s header version %s differs from library version %s.\n");
708 static const char fmt4
[] =
709 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
711 #define __VERSION__ "[?]"
714 file
== stderr
? _(fmt1
) : fmt1
,
715 indent
, *indent
!= 0 ? " " : "",
716 lang_hooks
.name
, pkgversion_string
, version_string
, TARGET_NAME
,
717 indent
, __VERSION__
);
719 /* We need to stringify the GMP macro values. Ugh, gmp_version has
720 two string formats, "i.j.k" and "i.j" when k is zero. As of
721 gmp-4.3.0, GMP always uses the 3 number format. */
722 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
723 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3(X)
724 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
725 #define GCC_GMP_VERSION \
726 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
727 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
728 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
729 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR)
731 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
732 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) "." \
733 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_PATCHLEVEL)
736 file
== stderr
? _(fmt2
) : fmt2
,
737 GCC_GMP_STRINGIFY_VERSION
, MPFR_VERSION_STRING
, MPC_VERSION_STRING
);
738 if (strcmp (GCC_GMP_STRINGIFY_VERSION
, gmp_version
))
740 file
== stderr
? _(fmt3
) : fmt3
,
741 indent
, *indent
!= 0 ? " " : "",
742 "GMP", GCC_GMP_STRINGIFY_VERSION
, gmp_version
);
743 if (strcmp (MPFR_VERSION_STRING
, mpfr_get_version ()))
745 file
== stderr
? _(fmt3
) : fmt3
,
746 indent
, *indent
!= 0 ? " " : "",
747 "MPFR", MPFR_VERSION_STRING
, mpfr_get_version ());
748 if (strcmp (MPC_VERSION_STRING
, mpc_get_version ()))
750 file
== stderr
? _(fmt3
) : fmt3
,
751 indent
, *indent
!= 0 ? " " : "",
752 "MPC", MPC_VERSION_STRING
, mpc_get_version ());
754 file
== stderr
? _(fmt4
) : fmt4
,
755 indent
, *indent
!= 0 ? " " : "",
756 PARAM_VALUE (GGC_MIN_EXPAND
), PARAM_VALUE (GGC_MIN_HEAPSIZE
));
758 print_plugins_versions (file
, indent
);
761 #ifdef ASM_COMMENT_START
763 print_to_asm_out_file (print_switch_type type
, const char * text
)
765 bool prepend_sep
= true;
769 case SWITCH_TYPE_LINE_END
:
770 putc ('\n', asm_out_file
);
773 case SWITCH_TYPE_LINE_START
:
774 fputs (ASM_COMMENT_START
, asm_out_file
);
775 return strlen (ASM_COMMENT_START
);
777 case SWITCH_TYPE_DESCRIPTIVE
:
778 if (ASM_COMMENT_START
[0] == 0)
781 case SWITCH_TYPE_PASSED
:
782 case SWITCH_TYPE_ENABLED
:
784 fputc (' ', asm_out_file
);
785 fputs (text
, asm_out_file
);
786 /* No need to return the length here as
787 print_single_switch has already done it. */
797 print_to_stderr (print_switch_type type
, const char * text
)
801 case SWITCH_TYPE_LINE_END
:
805 case SWITCH_TYPE_LINE_START
:
808 case SWITCH_TYPE_PASSED
:
809 case SWITCH_TYPE_ENABLED
:
813 case SWITCH_TYPE_DESCRIPTIVE
:
814 fputs (text
, stderr
);
815 /* No need to return the length here as
816 print_single_switch has already done it. */
824 /* Print an option value and return the adjusted position in the line.
825 ??? print_fn doesn't handle errors, eg disk full; presumably other
826 code will catch a disk full though. */
829 print_single_switch (print_switch_fn_type print_fn
,
831 print_switch_type type
,
834 /* The ultrix fprintf returns 0 on success, so compute the result
835 we want here since we need it for the following test. The +1
836 is for the separator character that will probably be emitted. */
837 int len
= strlen (text
) + 1;
840 && pos
+ len
> MAX_LINE
)
842 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
847 pos
+= print_fn (SWITCH_TYPE_LINE_START
, NULL
);
849 print_fn (type
, text
);
853 /* Print active target switches using PRINT_FN.
854 POS is the current cursor position and MAX is the size of a "line".
855 Each line begins with INDENT and ends with TERM.
856 Each switch is separated from the next by SEP. */
859 print_switch_values (print_switch_fn_type print_fn
)
864 /* Fill in the -frandom-seed option, if the user didn't pass it, so
865 that it can be printed below. This helps reproducibility. */
866 if (!flag_random_seed
)
869 /* Print the options as passed. */
870 pos
= print_single_switch (print_fn
, pos
,
871 SWITCH_TYPE_DESCRIPTIVE
, _("options passed: "));
873 for (j
= 1; j
< save_decoded_options_count
; j
++)
875 switch (save_decoded_options
[j
].opt_index
)
888 pos
= print_single_switch (print_fn
, pos
, SWITCH_TYPE_PASSED
,
889 save_decoded_options
[j
].orig_option_with_args_text
);
893 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
895 /* Print the -f and -m options that have been enabled.
896 We don't handle language specific options but printing argv
898 pos
= print_single_switch (print_fn
, 0,
899 SWITCH_TYPE_DESCRIPTIVE
, _("options enabled: "));
901 for (j
= 0; j
< cl_options_count
; j
++)
902 if (cl_options
[j
].cl_report
903 && option_enabled (j
, &global_options
) > 0)
904 pos
= print_single_switch (print_fn
, pos
,
905 SWITCH_TYPE_ENABLED
, cl_options
[j
].opt_text
);
907 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
910 /* Open assembly code output file. Do this even if -fsyntax-only is
911 on, because then the driver will have provided the name of a
912 temporary file or bit bucket for us. NAME is the file specified on
913 the command line, possibly NULL. */
915 init_asm_output (const char *name
)
917 if (name
== NULL
&& asm_file_name
== 0)
918 asm_out_file
= stdout
;
921 if (asm_file_name
== 0)
923 int len
= strlen (dump_base_name
);
924 char *dumpname
= XNEWVEC (char, len
+ 6);
926 memcpy (dumpname
, dump_base_name
, len
+ 1);
927 strip_off_ending (dumpname
, len
);
928 strcat (dumpname
, ".s");
929 asm_file_name
= dumpname
;
931 if (!strcmp (asm_file_name
, "-"))
932 asm_out_file
= stdout
;
934 asm_out_file
= fopen (asm_file_name
, "w+b");
935 if (asm_out_file
== 0)
936 fatal_error ("can%'t open %s for writing: %m", asm_file_name
);
939 if (!flag_syntax_only
)
941 targetm
.asm_out
.file_start ();
943 if (flag_record_gcc_switches
)
945 if (targetm
.asm_out
.record_gcc_switches
)
947 /* Let the target know that we are about to start recording. */
948 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
950 /* Now record the switches. */
951 print_switch_values (targetm
.asm_out
.record_gcc_switches
);
952 /* Let the target know that the recording is over. */
953 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
957 inform (input_location
, "-frecord-gcc-switches is not supported by the current target");
960 #ifdef ASM_COMMENT_START
961 if (flag_verbose_asm
)
963 /* Print the list of switches in effect
964 into the assembler file as comments. */
965 print_version (asm_out_file
, ASM_COMMENT_START
);
966 print_switch_values (print_to_asm_out_file
);
967 putc ('\n', asm_out_file
);
973 /* Default tree printer. Handles declarations only. */
975 default_tree_printer (pretty_printer
*pp
, text_info
*text
, const char *spec
,
976 int precision
, bool wide
, bool set_locus
, bool hash
)
980 /* FUTURE: %+x should set the locus. */
981 if (precision
!= 0 || wide
|| hash
)
987 t
= va_arg (*text
->args_ptr
, tree
);
988 if (TREE_CODE (t
) == IDENTIFIER_NODE
)
990 pp_identifier (pp
, IDENTIFIER_POINTER (t
));
996 t
= va_arg (*text
->args_ptr
, tree
);
997 if (DECL_DEBUG_EXPR_IS_FROM (t
) && DECL_DEBUG_EXPR (t
))
998 t
= DECL_DEBUG_EXPR (t
);
1003 t
= va_arg (*text
->args_ptr
, tree
);
1007 percent_K_format (text
);
1014 if (set_locus
&& text
->locus
)
1015 *text
->locus
= DECL_SOURCE_LOCATION (t
);
1019 const char *n
= DECL_NAME (t
)
1020 ? identifier_to_locale (lang_hooks
.decl_printable_name (t
, 2))
1025 dump_generic_node (pp
, t
, 0, TDF_DIAGNOSTIC
, 0);
1030 /* A helper function; used as the reallocator function for cpp's line
1033 realloc_for_line_map (void *ptr
, size_t len
)
1035 return GGC_RESIZEVAR (void, ptr
, len
);
1038 /* A helper function: used as the allocator function for
1039 identifier_to_locale. */
1041 alloc_for_identifier_to_locale (size_t len
)
1043 return ggc_alloc_atomic (len
);
1046 /* Output stack usage information. */
1048 output_stack_usage (void)
1050 static bool warning_issued
= false;
1051 enum stack_usage_kind_type
{ STATIC
= 0, DYNAMIC
, DYNAMIC_BOUNDED
};
1052 const char *stack_usage_kind_str
[] = {
1057 HOST_WIDE_INT stack_usage
= current_function_static_stack_size
;
1058 enum stack_usage_kind_type stack_usage_kind
;
1059 expanded_location loc
;
1060 const char *raw_id
, *id
;
1062 if (stack_usage
< 0)
1064 if (!warning_issued
)
1066 warning (0, "-fstack-usage not supported for this target");
1067 warning_issued
= true;
1072 stack_usage_kind
= STATIC
;
1074 /* Add the maximum amount of space pushed onto the stack. */
1075 if (current_function_pushed_stack_size
> 0)
1077 stack_usage
+= current_function_pushed_stack_size
;
1078 stack_usage_kind
= DYNAMIC_BOUNDED
;
1081 /* Now on to the tricky part: dynamic stack allocation. */
1082 if (current_function_allocates_dynamic_stack_space
)
1084 if (current_function_has_unbounded_dynamic_stack_size
)
1085 stack_usage_kind
= DYNAMIC
;
1087 stack_usage_kind
= DYNAMIC_BOUNDED
;
1089 /* Add the size even in the unbounded case, this can't hurt. */
1090 stack_usage
+= current_function_dynamic_stack_size
;
1093 loc
= expand_location (DECL_SOURCE_LOCATION (current_function_decl
));
1095 /* Strip the scope prefix if any. */
1096 raw_id
= lang_hooks
.decl_printable_name (current_function_decl
, 2);
1097 id
= strrchr (raw_id
, '.');
1103 fprintf (stack_usage_file
,
1104 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC
"\t%s\n",
1105 lbasename (loc
.file
),
1110 stack_usage_kind_str
[stack_usage_kind
]);
1113 /* Open an auxiliary output file. */
1115 open_auxiliary_file (const char *ext
)
1120 filename
= concat (aux_base_name
, ".", ext
, NULL
);
1121 file
= fopen (filename
, "w");
1123 fatal_error ("can%'t open %s for writing: %m", filename
);
1128 /* Initialization of the front end environment, before command line
1129 options are parsed. Signal handlers, internationalization etc.
1130 ARGV0 is main's argv[0]. */
1132 general_init (const char *argv0
)
1136 p
= argv0
+ strlen (argv0
);
1137 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
1141 xmalloc_set_program_name (progname
);
1145 /* Unlock the stdio streams. */
1146 unlock_std_streams ();
1148 gcc_init_libintl ();
1150 identifier_to_locale_alloc
= alloc_for_identifier_to_locale
;
1151 identifier_to_locale_free
= ggc_free
;
1153 /* Initialize the diagnostics reporting machinery, so option parsing
1154 can give warnings and errors. */
1155 diagnostic_initialize (global_dc
, N_OPTS
);
1156 diagnostic_starter (global_dc
) = default_tree_diagnostic_starter
;
1157 /* Set a default printer. Language specific initializations will
1158 override it later. */
1159 pp_format_decoder (global_dc
->printer
) = &default_tree_printer
;
1160 global_dc
->show_option_requested
1161 = global_options_init
.x_flag_diagnostics_show_option
;
1162 global_dc
->show_column
1163 = global_options_init
.x_flag_show_column
;
1164 global_dc
->internal_error
= plugins_internal_error_function
;
1165 global_dc
->option_enabled
= option_enabled
;
1166 global_dc
->option_state
= &global_options
;
1167 global_dc
->option_name
= option_name
;
1169 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1171 signal (SIGSEGV
, crash_signal
);
1174 signal (SIGILL
, crash_signal
);
1177 signal (SIGBUS
, crash_signal
);
1180 signal (SIGABRT
, crash_signal
);
1182 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1183 signal (SIGIOT
, crash_signal
);
1186 signal (SIGFPE
, crash_signal
);
1189 /* Other host-specific signal setup. */
1190 (*host_hooks
.extra_signals
)();
1192 /* Initialize the garbage-collector, string pools and tree type hash
1196 line_table
= ggc_alloc_line_maps ();
1197 linemap_init (line_table
);
1198 line_table
->reallocator
= realloc_for_line_map
;
1201 /* Initialize register usage now so switches may override. */
1204 /* Register the language-independent parameters. */
1205 add_params (lang_independent_params
, LAST_PARAM
);
1206 targetm
.target_option
.default_params ();
1208 /* This must be done after add_params but before argument processing. */
1209 init_ggc_heuristics();
1210 init_optimization_passes ();
1211 statistics_early_init ();
1215 /* Return true if the current target supports -fsection-anchors. */
1218 target_supports_section_anchors_p (void)
1220 if (targetm
.min_anchor_offset
== 0 && targetm
.max_anchor_offset
== 0)
1223 if (targetm
.asm_out
.output_anchor
== NULL
)
1229 /* Default the align_* variables to 1 if they're still unset, and
1230 set up the align_*_log variables. */
1232 init_alignments (void)
1234 if (align_loops
<= 0)
1236 if (align_loops_max_skip
> align_loops
)
1237 align_loops_max_skip
= align_loops
- 1;
1238 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
1239 if (align_jumps
<= 0)
1241 if (align_jumps_max_skip
> align_jumps
)
1242 align_jumps_max_skip
= align_jumps
- 1;
1243 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
1244 if (align_labels
<= 0)
1246 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
1247 if (align_labels_max_skip
> align_labels
)
1248 align_labels_max_skip
= align_labels
- 1;
1249 if (align_functions
<= 0)
1250 align_functions
= 1;
1251 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
1254 /* Process the options that have been parsed. */
1256 process_options (void)
1258 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1259 This can happen with incorrect pre-processed input. */
1260 debug_hooks
= &do_nothing_debug_hooks
;
1262 maximum_field_alignment
= initial_max_fld_align
* BITS_PER_UNIT
;
1264 /* This replaces set_Wunused. */
1265 if (warn_unused_function
== -1)
1266 warn_unused_function
= warn_unused
;
1267 if (warn_unused_label
== -1)
1268 warn_unused_label
= warn_unused
;
1269 /* Wunused-parameter is enabled if both -Wunused -Wextra are enabled. */
1270 if (warn_unused_parameter
== -1)
1271 warn_unused_parameter
= (warn_unused
&& extra_warnings
);
1272 if (warn_unused_variable
== -1)
1273 warn_unused_variable
= warn_unused
;
1274 /* Wunused-but-set-parameter is enabled if both -Wunused -Wextra are
1276 if (warn_unused_but_set_parameter
== -1)
1277 warn_unused_but_set_parameter
= (warn_unused
&& extra_warnings
);
1278 if (warn_unused_but_set_variable
== -1)
1279 warn_unused_but_set_variable
= warn_unused
;
1280 if (warn_unused_value
== -1)
1281 warn_unused_value
= warn_unused
;
1283 /* This replaces set_Wextra. */
1284 if (warn_uninitialized
== -1)
1285 warn_uninitialized
= extra_warnings
;
1287 /* Allow the front end to perform consistency checks and do further
1288 initialization based on the command line options. This hook also
1289 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1290 so we can correctly initialize debug output. */
1291 no_backend
= lang_hooks
.post_options (&main_input_filename
);
1293 /* Some machines may reject certain combinations of options. */
1294 targetm
.target_option
.override ();
1296 /* Avoid any informative notes in the second run of -fcompare-debug. */
1297 if (flag_compare_debug
)
1298 diagnostic_inhibit_notes (global_dc
);
1300 if (flag_section_anchors
&& !target_supports_section_anchors_p ())
1302 warning (OPT_fsection_anchors
,
1303 "this target does not support %qs", "-fsection-anchors");
1304 flag_section_anchors
= 0;
1307 if (flag_short_enums
== 2)
1308 flag_short_enums
= targetm
.default_short_enums ();
1310 /* Set aux_base_name if not already set. */
1313 else if (main_input_filename
)
1315 char *name
= xstrdup (lbasename (main_input_filename
));
1317 strip_off_ending (name
, strlen (name
));
1318 aux_base_name
= name
;
1321 aux_base_name
= "gccaux";
1325 || flag_graphite_identity
1327 || flag_loop_flatten
1328 || flag_loop_interchange
1329 || flag_loop_strip_mine
1330 || flag_loop_parallelize_all
)
1331 sorry ("Graphite loop optimizations cannot be used (-fgraphite, "
1332 "-fgraphite-identity, -floop-block, -floop-flatten, "
1333 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1334 "and -ftree-loop-linear)");
1337 /* Unrolling all loops implies that standard loop unrolling must also
1339 if (flag_unroll_all_loops
)
1340 flag_unroll_loops
= 1;
1342 /* web and rename-registers help when run after loop unrolling. */
1343 if (flag_web
== AUTODETECT_VALUE
)
1344 flag_web
= flag_unroll_loops
|| flag_peel_loops
;
1346 if (flag_rename_registers
== AUTODETECT_VALUE
)
1347 flag_rename_registers
= flag_unroll_loops
|| flag_peel_loops
;
1349 if (flag_non_call_exceptions
)
1350 flag_asynchronous_unwind_tables
= 1;
1351 if (flag_asynchronous_unwind_tables
)
1352 flag_unwind_tables
= 1;
1354 if (flag_value_profile_transformations
)
1355 flag_profile_values
= 1;
1357 /* Warn about options that are not supported on this machine. */
1358 #ifndef INSN_SCHEDULING
1359 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
1360 warning (0, "instruction scheduling not supported on this target machine");
1363 if (flag_delayed_branch
)
1364 warning (0, "this target machine does not have delayed branches");
1367 user_label_prefix
= USER_LABEL_PREFIX
;
1368 if (flag_leading_underscore
!= -1)
1370 /* If the default prefix is more complicated than "" or "_",
1371 issue a warning and ignore this option. */
1372 if (user_label_prefix
[0] == 0 ||
1373 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
1375 user_label_prefix
= flag_leading_underscore
? "_" : "";
1378 warning (0, "-f%sleading-underscore not supported on this target machine",
1379 flag_leading_underscore
? "" : "no-");
1382 /* If we are in verbose mode, write out the version and maybe all the
1383 option flags in use. */
1386 print_version (stderr
, "");
1388 print_switch_values (print_to_stderr
);
1391 if (flag_syntax_only
)
1393 write_symbols
= NO_DEBUG
;
1399 if (debug_info_level
== DINFO_LEVEL_NONE
)
1401 debug_info_level
= DINFO_LEVEL_NORMAL
;
1403 if (write_symbols
== NO_DEBUG
)
1404 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
1407 debug_info_level
= DINFO_LEVEL_NONE
;
1410 if (flag_dump_final_insns
&& !flag_syntax_only
&& !no_backend
)
1412 FILE *final_output
= fopen (flag_dump_final_insns
, "w");
1415 error ("could not open final insn dump file %qs: %m",
1416 flag_dump_final_insns
);
1417 flag_dump_final_insns
= NULL
;
1419 else if (fclose (final_output
))
1421 error ("could not close zeroed insn dump file %qs: %m",
1422 flag_dump_final_insns
);
1423 flag_dump_final_insns
= NULL
;
1427 /* Unless over-ridden for the target, assume that all DWARF levels
1428 may be emitted, if DWARF2_DEBUG is selected. */
1429 if (dwarf_strict
< 0)
1432 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1434 if (debug_info_level
== DINFO_LEVEL_NONE
)
1435 write_symbols
= NO_DEBUG
;
1437 if (write_symbols
== NO_DEBUG
)
1439 #if defined(DBX_DEBUGGING_INFO)
1440 else if (write_symbols
== DBX_DEBUG
)
1441 debug_hooks
= &dbx_debug_hooks
;
1443 #if defined(XCOFF_DEBUGGING_INFO)
1444 else if (write_symbols
== XCOFF_DEBUG
)
1445 debug_hooks
= &xcoff_debug_hooks
;
1447 #ifdef SDB_DEBUGGING_INFO
1448 else if (write_symbols
== SDB_DEBUG
)
1449 debug_hooks
= &sdb_debug_hooks
;
1451 #ifdef DWARF2_DEBUGGING_INFO
1452 else if (write_symbols
== DWARF2_DEBUG
)
1453 debug_hooks
= &dwarf2_debug_hooks
;
1455 #ifdef VMS_DEBUGGING_INFO
1456 else if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1457 debug_hooks
= &vmsdbg_debug_hooks
;
1460 error ("target system does not support the \"%s\" debug format",
1461 debug_type_names
[write_symbols
]);
1463 /* We know which debug output will be used so we can set flag_var_tracking
1464 and flag_var_tracking_uninit if the user has not specified them. */
1465 if (debug_info_level
< DINFO_LEVEL_NORMAL
1466 || debug_hooks
->var_location
== do_nothing_debug_hooks
.var_location
)
1468 if (flag_var_tracking
== 1
1469 || flag_var_tracking_uninit
== 1)
1471 if (debug_info_level
< DINFO_LEVEL_NORMAL
)
1472 warning (0, "variable tracking requested, but useless unless "
1473 "producing debug info");
1475 warning (0, "variable tracking requested, but not supported "
1476 "by this debug format");
1478 flag_var_tracking
= 0;
1479 flag_var_tracking_uninit
= 0;
1482 /* The debug hooks are used to implement -fdump-go-spec because it
1483 gives a simple and stable API for all the information we need to
1485 if (flag_dump_go_spec
!= NULL
)
1486 debug_hooks
= dump_go_spec_init (flag_dump_go_spec
, debug_hooks
);
1488 /* If the user specifically requested variable tracking with tagging
1489 uninitialized variables, we need to turn on variable tracking.
1490 (We already determined above that variable tracking is feasible.) */
1491 if (flag_var_tracking_uninit
)
1492 flag_var_tracking
= 1;
1494 if (flag_var_tracking
== AUTODETECT_VALUE
)
1495 flag_var_tracking
= optimize
>= 1;
1497 if (flag_var_tracking_assignments
== AUTODETECT_VALUE
)
1498 flag_var_tracking_assignments
= flag_var_tracking
1499 && !(flag_selective_scheduling
|| flag_selective_scheduling2
);
1501 if (flag_var_tracking_assignments_toggle
)
1502 flag_var_tracking_assignments
= !flag_var_tracking_assignments
;
1504 if (flag_var_tracking_assignments
&& !flag_var_tracking
)
1505 flag_var_tracking
= flag_var_tracking_assignments
= -1;
1507 if (flag_var_tracking_assignments
1508 && (flag_selective_scheduling
|| flag_selective_scheduling2
))
1509 warning (0, "var-tracking-assignments changes selective scheduling");
1511 if (flag_tree_cselim
== AUTODETECT_VALUE
)
1512 #ifdef HAVE_conditional_move
1513 flag_tree_cselim
= 1;
1515 flag_tree_cselim
= 0;
1518 /* If auxiliary info generation is desired, open the output file.
1519 This goes in the same directory as the source file--unlike
1520 all the other output files. */
1521 if (flag_gen_aux_info
)
1523 aux_info_file
= fopen (aux_info_file_name
, "w");
1524 if (aux_info_file
== 0)
1525 fatal_error ("can%'t open %s: %m", aux_info_file_name
);
1528 if (! targetm
.have_named_sections
)
1530 if (flag_function_sections
)
1532 warning (0, "-ffunction-sections not supported for this target");
1533 flag_function_sections
= 0;
1535 if (flag_data_sections
)
1537 warning (0, "-fdata-sections not supported for this target");
1538 flag_data_sections
= 0;
1542 if (flag_function_sections
&& profile_flag
)
1544 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
1545 flag_function_sections
= 0;
1548 #ifndef HAVE_prefetch
1549 if (flag_prefetch_loop_arrays
> 0)
1551 warning (0, "-fprefetch-loop-arrays not supported for this target");
1552 flag_prefetch_loop_arrays
= 0;
1555 if (flag_prefetch_loop_arrays
> 0 && !HAVE_prefetch
)
1557 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1558 flag_prefetch_loop_arrays
= 0;
1562 /* This combination of options isn't handled for i386 targets and doesn't
1563 make much sense anyway, so don't allow it. */
1564 if (flag_prefetch_loop_arrays
> 0 && optimize_size
)
1566 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1567 flag_prefetch_loop_arrays
= 0;
1570 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1571 if (flag_signaling_nans
)
1572 flag_trapping_math
= 1;
1574 /* We cannot reassociate if we want traps or signed zeros. */
1575 if (flag_associative_math
&& (flag_trapping_math
|| flag_signed_zeros
))
1577 warning (0, "-fassociative-math disabled; other options take precedence");
1578 flag_associative_math
= 0;
1581 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1582 if (flag_cx_limited_range
)
1583 flag_complex_method
= 0;
1585 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1586 if (flag_cx_fortran_rules
)
1587 flag_complex_method
= 1;
1589 /* Targets must be able to place spill slots at lower addresses. If the
1590 target already uses a soft frame pointer, the transition is trivial. */
1591 if (!FRAME_GROWS_DOWNWARD
&& flag_stack_protect
)
1593 warning (0, "-fstack-protector not supported for this target");
1594 flag_stack_protect
= 0;
1596 if (!flag_stack_protect
)
1597 warn_stack_protect
= 0;
1599 /* ??? Unwind info is not correct around the CFG unless either a frame
1600 pointer is present or A_O_A is set. Fixing this requires rewriting
1601 unwind info generation to be aware of the CFG and propagating states
1603 if (flag_unwind_tables
&& !ACCUMULATE_OUTGOING_ARGS
1604 && flag_omit_frame_pointer
)
1606 warning (0, "unwind tables currently require a frame pointer "
1608 flag_omit_frame_pointer
= 0;
1611 /* Save the current optimization options. */
1612 optimization_default_node
= build_optimization_node ();
1613 optimization_current_node
= optimization_default_node
;
1616 /* This function can be called multiple times to reinitialize the compiler
1617 back end when register classes or instruction sets have changed,
1618 before each function. */
1620 backend_init_target (void)
1622 /* Initialize alignment variables. */
1625 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
1626 to initialize reg_raw_mode[]. */
1629 /* This invokes target hooks to set fixed_reg[] etc, which is
1633 /* This depends on stack_pointer_rtx. */
1634 init_fake_stack_mems ();
1636 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1638 init_alias_target ();
1640 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1643 /* The following initialization functions need to generate rtl, so
1644 provide a dummy function context for them. */
1645 init_dummy_function_start ();
1647 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1648 on a mode change. */
1651 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1652 after a mode change as well. */
1653 caller_save_initialized_p
= false;
1655 expand_dummy_function_end ();
1658 /* Initialize the compiler back end. This function is called only once,
1659 when starting the compiler. */
1666 init_inline_once ();
1667 init_varasm_once ();
1668 save_register_info ();
1670 /* Initialize the target-specific back end pieces. */
1672 backend_init_target ();
1675 /* Initialize excess precision settings. */
1677 init_excess_precision (void)
1679 /* Adjust excess precision handling based on the target options. If
1680 the front end cannot handle it, flag_excess_precision_cmdline
1681 will already have been set accordingly in the post_options
1683 gcc_assert (flag_excess_precision_cmdline
!= EXCESS_PRECISION_DEFAULT
);
1684 flag_excess_precision
= flag_excess_precision_cmdline
;
1685 if (flag_unsafe_math_optimizations
)
1686 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1687 if (flag_excess_precision
== EXCESS_PRECISION_STANDARD
)
1689 int flt_eval_method
= TARGET_FLT_EVAL_METHOD
;
1690 switch (flt_eval_method
)
1694 /* Either the target acts unpredictably (-1) or has all the
1695 operations required not to have excess precision (0). */
1696 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1700 /* In these cases, predictable excess precision makes
1704 /* Any other implementation-defined FLT_EVAL_METHOD values
1705 require the compiler to handle the associated excess
1706 precision rules in excess_precision_type. */
1712 /* Initialize things that are both lang-dependent and target-dependent.
1713 This function can be called more than once if target parameters change. */
1715 lang_dependent_init_target (void)
1717 /* This determines excess precision settings. */
1718 init_excess_precision ();
1720 /* This creates various _DECL nodes, so needs to be called after the
1721 front end is initialized. It also depends on the HAVE_xxx macros
1722 generated from the target machine description. */
1725 /* The following initialization functions need to generate rtl, so
1726 provide a dummy function context for them. */
1727 init_dummy_function_start ();
1729 /* Do the target-specific parts of expr initialization. */
1730 init_expr_target ();
1732 /* Although the actions of these functions are language-independent,
1733 they use optabs, so we cannot call them from backend_init. */
1737 expand_dummy_function_end ();
1740 /* Language-dependent initialization. Returns nonzero on success. */
1742 lang_dependent_init (const char *name
)
1744 location_t save_loc
= input_location
;
1745 if (dump_base_name
== 0)
1746 dump_base_name
= name
&& name
[0] ? name
: "gccdump";
1748 /* Other front-end initialization. */
1749 input_location
= BUILTINS_LOCATION
;
1750 if (lang_hooks
.init () == 0)
1752 input_location
= save_loc
;
1756 init_asm_output (name
);
1758 /* If stack usage information is desired, open the output file. */
1759 if (flag_stack_usage
)
1760 stack_usage_file
= open_auxiliary_file ("su");
1763 /* This creates various _DECL nodes, so needs to be called after the
1764 front end is initialized. */
1767 /* Do the target-specific parts of the initialization. */
1768 lang_dependent_init_target ();
1772 /* If dbx symbol table desired, initialize writing it and output the
1773 predefined types. */
1774 timevar_push (TV_SYMOUT
);
1776 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
1777 if (dwarf2out_do_frame ())
1778 dwarf2out_frame_init ();
1781 /* Now we have the correct original filename, we can initialize
1783 (*debug_hooks
->init
) (name
);
1785 timevar_pop (TV_SYMOUT
);
1792 /* Reinitialize everything when target parameters, such as register usage,
1795 target_reinit (void)
1797 struct rtl_data saved_x_rtl
;
1798 rtx
*saved_regno_reg_rtx
;
1800 /* Save *crtl and regno_reg_rtx around the reinitialization
1801 to allow target_reinit being called even after prepare_function_start. */
1802 saved_regno_reg_rtx
= regno_reg_rtx
;
1803 if (saved_regno_reg_rtx
)
1805 saved_x_rtl
= *crtl
;
1806 memset (crtl
, '\0', sizeof (*crtl
));
1807 regno_reg_rtx
= NULL
;
1810 /* Reinitialize RTL backend. */
1811 backend_init_target ();
1813 /* Reinitialize lang-dependent parts. */
1814 lang_dependent_init_target ();
1816 /* And restore it at the end, as free_after_compilation from
1817 expand_dummy_function_end clears it. */
1818 if (saved_regno_reg_rtx
)
1820 *crtl
= saved_x_rtl
;
1821 regno_reg_rtx
= saved_regno_reg_rtx
;
1822 saved_regno_reg_rtx
= NULL
;
1827 dump_memory_report (bool final
)
1829 ggc_print_statistics ();
1830 stringpool_statistics ();
1831 dump_tree_statistics ();
1832 dump_gimple_statistics ();
1833 dump_rtx_statistics ();
1834 dump_alloc_pool_statistics ();
1835 dump_bitmap_statistics ();
1836 dump_vec_loc_statistics ();
1837 dump_ggc_loc_statistics (final
);
1838 dump_alias_stats (stderr
);
1839 dump_pta_stats (stderr
);
1842 /* Clean up: close opened files, etc. */
1845 finalize (bool no_backend
)
1847 /* Close the dump files. */
1848 if (flag_gen_aux_info
)
1850 fclose (aux_info_file
);
1852 unlink (aux_info_file_name
);
1855 /* Close non-debugging input and output files. Take special care to note
1856 whether fclose returns an error, since the pages might still be on the
1857 buffer chain while the file is open. */
1861 if (ferror (asm_out_file
) != 0)
1862 fatal_error ("error writing to %s: %m", asm_file_name
);
1863 if (fclose (asm_out_file
) != 0)
1864 fatal_error ("error closing %s: %m", asm_file_name
);
1867 if (stack_usage_file
)
1868 fclose (stack_usage_file
);
1874 finish_optimization_passes ();
1880 dump_memory_report (true);
1882 /* Language-specific end of compilation actions. */
1883 lang_hooks
.finish ();
1886 /* Initialize the compiler, and compile the input file. */
1890 /* Initialize timing first. The C front ends read the main file in
1891 the post_options hook, and C++ does file timings. */
1892 if (time_report
|| !quiet_flag
|| flag_detailed_statistics
)
1894 timevar_start (TV_TOTAL
);
1898 /* Don't do any more if an error has already occurred. */
1901 timevar_start (TV_PHASE_SETUP
);
1903 /* This must be run always, because it is needed to compute the FP
1904 predefined macros, such as __LDBL_MAX__, for targets using non
1905 default FP formats. */
1906 init_adjust_machine_modes ();
1908 /* Set up the back-end if requested. */
1912 timevar_stop (TV_PHASE_SETUP
);
1914 /* Language-dependent initialization. Returns true on success. */
1915 if (lang_dependent_init (main_input_filename
))
1918 timevar_start (TV_PHASE_FINALIZE
);
1920 finalize (no_backend
);
1922 timevar_stop (TV_PHASE_FINALIZE
);
1925 /* Stop timing and print the times. */
1926 timevar_stop (TV_TOTAL
);
1927 timevar_print (stderr
);
1930 /* Entry point of cc1, cc1plus, jc1, f771, etc.
1931 Exit code is FATAL_EXIT_CODE if can't open files or if there were
1932 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
1934 It is not safe to call this function more than once. */
1937 toplev_main (int argc
, char **argv
)
1939 expandargv (&argc
, &argv
);
1941 /* Initialization of GCC's environment, and diagnostics. */
1942 general_init (argv
[0]);
1944 /* One-off initialization of options that does not need to be
1945 repeated when options are added for particular functions. */
1946 init_options_once ();
1948 /* Initialize global options structures; this must be repeated for
1949 each structure used for parsing options. */
1950 init_options_struct (&global_options
, &global_options_set
);
1951 lang_hooks
.init_options_struct (&global_options
);
1953 /* Convert the options to an array. */
1954 decode_cmdline_options_to_array_default_mask (argc
,
1955 CONST_CAST2 (const char **,
1957 &save_decoded_options
,
1958 &save_decoded_options_count
);
1960 /* Perform language-specific options initialization. */
1961 lang_hooks
.init_options (save_decoded_options_count
, save_decoded_options
);
1963 /* Parse the options and do minimal processing; basically just
1964 enough to default flags appropriately. */
1965 decode_options (&global_options
, &global_options_set
,
1966 save_decoded_options
, save_decoded_options_count
,
1967 UNKNOWN_LOCATION
, global_dc
);
1969 handle_common_deferred_options ();
1973 initialize_plugins ();
1976 print_version (stderr
, "");
1979 print_plugins_help (stderr
, "");
1981 /* Exit early if we can (e.g. -help). */
1982 if (!exit_after_options
)
1985 if (warningcount
|| errorcount
)
1986 print_ignored_options ();
1987 diagnostic_finish (global_dc
);
1989 /* Invoke registered plugin callbacks if any. */
1990 invoke_plugin_callbacks (PLUGIN_FINISH
, NULL
);
1992 finalize_plugins ();
1994 return (FATAL_EXIT_CODE
);
1996 return (SUCCESS_EXIT_CODE
);