1 /* Top level of GCC compilers (cc1, cc1plus, etc.)
2 Copyright (C) 1987-2014 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /* This is the top level of cc1/c++.
21 It parses command args, opens files, invokes the various passes
22 in the proper order, and counts the time used by each.
23 Error messages and low-level interface to malloc also handled here. */
27 #include "coretypes.h"
33 #include "tree-inline.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"
56 #include "diagnostic.h"
57 #include "tree-diagnostic.h"
58 #include "tree-pretty-print.h"
63 #include "dwarf2asm.h"
66 #include "common/common-target.h"
67 #include "langhooks.h"
68 #include "cfgloop.h" /* for init_set_costs */
69 #include "hosthooks.h"
71 #include "basic-block.h"
74 #include "plugin-api.h"
78 #include "opts-diagnostic.h"
80 #include "value-prof.h"
81 #include "alloc-pool.h"
84 #include "tree-ssa-alias.h"
85 #include "internal-fn.h"
86 #include "gimple-expr.h"
89 #include "diagnostic-color.h"
91 #include "pass_manager.h"
92 #include "auto-profile.h"
93 #include "dwarf2out.h"
95 #include "ipa-reference.h"
98 #include "insn-codes.h"
100 #include "tree-chkp.h"
103 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
107 #ifdef SDB_DEBUGGING_INFO
111 #ifdef XCOFF_DEBUGGING_INFO
112 #include "xcoffout.h" /* Needed for external data
113 declarations for e.g. AIX 4.x. */
118 static void general_init (const char *);
119 static void do_compile ();
120 static void process_options (void);
121 static void backend_init (void);
122 static int lang_dependent_init (const char *);
123 static void init_asm_output (const char *);
124 static void finalize (bool);
126 static void crash_signal (int) ATTRIBUTE_NORETURN
;
127 static void compile_file (void);
129 /* True if we don't need a backend (e.g. preprocessing only). */
130 static bool no_backend
;
132 /* Length of line when printing switch values. */
135 /* Decoded options, and number of such options. */
136 struct cl_decoded_option
*save_decoded_options
;
137 unsigned int save_decoded_options_count
;
139 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
140 to optimize in process_options (). */
141 #define AUTODETECT_VALUE 2
143 /* Debug hooks - dependent upon command line options. */
145 const struct gcc_debug_hooks
*debug_hooks
;
147 /* The FUNCTION_DECL for the function currently being compiled,
148 or 0 if between functions. */
149 tree current_function_decl
;
151 /* Set to the FUNC_BEGIN label of the current function, or NULL
153 const char * current_function_func_begin_label
;
155 /* A random sequence of characters, unless overridden by user. */
156 static const char *flag_random_seed
;
158 /* A local time stamp derived from the time of compilation. It will be
159 zero if the system cannot provide a time. It will be -1u, if the
160 user has specified a particular random seed. */
163 /* Random number for this compilation */
164 HOST_WIDE_INT random_seed
;
168 /* When non-NULL, indicates that whenever space is allocated on the
169 stack, the resulting stack pointer must not pass this
170 address---that is, for stacks that grow downward, the stack pointer
171 must always be greater than or equal to this address; for stacks
172 that grow upward, the stack pointer must be less than this address.
173 At present, the rtx may be either a REG or a SYMBOL_REF, although
174 the support provided depends on the backend. */
177 /* True if the user has tagged the function with the 'section'
180 bool user_defined_section_attribute
= false;
182 struct target_flag_state default_target_flag_state
;
183 #if SWITCHABLE_TARGET
184 struct target_flag_state
*this_target_flag_state
= &default_target_flag_state
;
186 #define this_target_flag_state (&default_target_flag_state)
189 /* The user symbol prefix after having resolved same. */
190 const char *user_label_prefix
;
192 /* Output files for assembler code (real compiler output)
193 and debugging dumps. */
197 FILE *stack_usage_file
= NULL
;
199 /* The current working directory of a translation. It's generally the
200 directory from which compilation was initiated, but a preprocessed
201 file may specify the original directory in which it was
204 static const char *src_pwd
;
206 /* Initialize src_pwd with the given string, and return true. If it
207 was already initialized, return false. As a special case, it may
208 be called with a NULL argument to test whether src_pwd has NOT been
212 set_src_pwd (const char *pwd
)
216 if (strcmp (src_pwd
, pwd
) == 0)
222 src_pwd
= xstrdup (pwd
);
226 /* Return the directory from which the translation unit was initiated,
227 in case set_src_pwd() was not called before to assign it a
243 /* Called when the start of a function definition is parsed,
244 this function prints on stderr the name of the function. */
246 announce_function (tree decl
)
250 if (rtl_dump_and_exit
)
251 fprintf (stderr
, "%s ",
252 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl
))));
254 fprintf (stderr
, " %s",
255 identifier_to_locale (lang_hooks
.decl_printable_name (decl
, 2)));
257 pp_needs_newline (global_dc
->printer
) = true;
258 diagnostic_set_last_function (global_dc
, (diagnostic_info
*) NULL
);
262 /* Initialize local_tick with a random number or -1 if
263 flag_random_seed is set. */
266 init_local_tick (void)
268 if (!flag_random_seed
)
270 /* Try urandom first. Time of day is too likely to collide.
271 In case of any error we just use the local tick. */
273 int fd
= open ("/dev/urandom", O_RDONLY
);
276 read (fd
, &random_seed
, sizeof (random_seed
));
280 /* Now get the tick anyways */
281 #ifdef HAVE_GETTIMEOFDAY
285 gettimeofday (&tv
, NULL
);
286 local_tick
= (unsigned) tv
.tv_sec
* 1000 + tv
.tv_usec
/ 1000;
290 time_t now
= time (NULL
);
292 if (now
!= (time_t)-1)
293 local_tick
= (unsigned) now
;
301 /* Set up a default flag_random_seed and local_tick, unless the user
302 already specified one. Must be called after init_local_tick. */
305 init_random_seed (void)
308 random_seed
= local_tick
^ getpid (); /* Old racey fallback method */
311 /* Obtain the random_seed. Unless NOINIT, initialize it if
312 it's not provided in the command line. */
315 get_random_seed (bool noinit
)
317 if (!flag_random_seed
&& !noinit
)
322 /* Modify the random_seed string to VAL. Return its previous
326 set_random_seed (const char *val
)
328 const char *old
= flag_random_seed
;
329 flag_random_seed
= val
;
330 if (flag_random_seed
)
334 /* When the driver passed in a hex number don't crc it again */
335 random_seed
= strtoul (flag_random_seed
, &endp
, 0);
336 if (!(endp
> flag_random_seed
&& *endp
== 0))
337 random_seed
= crc32_string (0, flag_random_seed
);
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
)
386 || (TREE_CODE (decl
) == VAR_DECL
&& DECL_HAS_VALUE_EXPR_P (decl
)))
389 /* Don't write out static consts, unless we still need them.
391 We also keep static consts if not optimizing (for debugging),
392 unless the user specified -fno-keep-static-consts.
393 ??? They might be better written into the debug information.
394 This is possible when using DWARF.
396 A language processor that wants static constants to be always
397 written out (even if it is not used) is responsible for
398 calling rest_of_decl_compilation itself. E.g. the C front-end
399 calls rest_of_decl_compilation from finish_decl.
400 One motivation for this is that is conventional in some
401 environments to write things like:
402 static const char rcsid[] = "... version string ...";
403 intending to force the string to be in the executable.
405 A language processor that would prefer to have unneeded
406 static constants "optimized away" would just defer writing
407 them out until here. E.g. C++ does this, because static
408 constants are often defined in header files.
410 ??? A tempting alternative (for both C and C++) would be
411 to force a constant to be written if and only if it is
412 defined in a main file, as opposed to an include file. */
414 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
418 node
= varpool_node::get (decl
);
420 if (!node
&& flag_ltrans
)
422 else if (node
&& node
->definition
)
424 else if (node
&& node
->alias
)
426 else if (!symtab
->global_info_ready
428 || TREE_USED (DECL_ASSEMBLER_NAME (decl
))))
430 else if (node
&& node
->analyzed
)
432 else if (DECL_COMDAT (decl
))
434 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
435 && (optimize
|| !flag_keep_static_consts
436 || DECL_ARTIFICIAL (decl
)))
441 rest_of_decl_compilation (decl
, 1, 1);
449 /* Do any final processing required for the declarations in VEC, of
450 which there are LEN. We write out inline functions and variables
451 that have been deferred until this point, but which are required.
452 Returns nonzero if anything was put out. */
455 wrapup_global_declarations (tree
*vec
, int len
)
457 bool reconsider
, output_something
= false;
460 for (i
= 0; i
< len
; i
++)
461 wrapup_global_declaration_1 (vec
[i
]);
463 /* Now emit any global variables or functions that we have been
464 putting off. We need to loop in case one of the things emitted
465 here references another one which comes earlier in the list. */
469 for (i
= 0; i
< len
; i
++)
470 reconsider
|= wrapup_global_declaration_2 (vec
[i
]);
472 output_something
= true;
476 return output_something
;
479 /* A subroutine of check_global_declarations. Issue appropriate warnings
480 for the global declaration DECL. */
483 check_global_declaration_1 (tree decl
)
485 /* Warn about any function declared static but not defined. We don't
486 warn about variables, because many programs have static variables
487 that exist only to get some text into the object file. */
488 if (TREE_CODE (decl
) == FUNCTION_DECL
489 && DECL_INITIAL (decl
) == 0
490 && DECL_EXTERNAL (decl
)
491 && ! DECL_ARTIFICIAL (decl
)
492 && ! TREE_NO_WARNING (decl
)
493 && ! TREE_PUBLIC (decl
)
494 && (warn_unused_function
495 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
497 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
498 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
500 warning (OPT_Wunused_function
, "%q+F declared %<static%> but never defined", decl
);
501 /* This symbol is effectively an "extern" declaration now. */
502 TREE_PUBLIC (decl
) = 1;
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 V (of
531 which there are LEN). */
534 check_global_declarations (tree
*v
, int len
)
538 for (i
= 0; i
< len
; i
++)
539 check_global_declaration_1 (v
[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 timevar_start (TV_PHASE_PARSING
);
566 timevar_push (TV_PARSE_GLOBAL
);
568 /* Call the parser, which parses the entire file (calling
569 rest_of_compilation for each function). */
570 lang_hooks
.parse_file ();
572 timevar_pop (TV_PARSE_GLOBAL
);
573 timevar_stop (TV_PHASE_PARSING
);
575 /* Compilation is now finished except for writing
576 what's left of the symbol table output. */
578 if (flag_syntax_only
|| flag_wpa
)
581 ggc_protect_identifiers
= false;
583 /* This must also call finalize_compilation_unit. */
584 lang_hooks
.decls
.final_write_globals ();
589 timevar_start (TV_PHASE_LATE_ASM
);
591 /* Compilation unit is finalized. When producing non-fat LTO object, we are
592 basically finished. */
593 if (in_lto_p
|| !flag_lto
|| flag_fat_lto_objects
)
595 /* File-scope initialization for AddressSanitizer. */
596 if (flag_sanitize
& SANITIZE_ADDRESS
)
599 if (flag_sanitize
& SANITIZE_THREAD
)
602 if (flag_check_pointer_bounds
)
607 output_shared_constant_pool ();
608 output_object_blocks ();
609 finish_tm_clone_pairs ();
611 /* Write out any pending weak symbol declarations. */
614 /* This must be at the end before unwind and debug info.
615 Some target ports emit PIC setup thunks here. */
616 targetm
.asm_out
.code_end ();
618 /* Do dbx symbols. */
619 timevar_push (TV_SYMOUT
);
621 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
622 if (dwarf2out_do_frame ())
623 dwarf2out_frame_finish ();
626 (*debug_hooks
->finish
) (main_input_filename
);
627 timevar_pop (TV_SYMOUT
);
629 /* Output some stuff at end of file if nec. */
631 dw2_output_indirect_constants ();
633 /* Flush any pending external directives. */
634 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);
656 /* Let linker plugin know that this is a slim object and must be LTOed
657 even when user did not ask for it. */
658 if (!flag_fat_lto_objects
)
660 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
661 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
,
663 (unsigned HOST_WIDE_INT
) 1, 8);
664 #elif defined ASM_OUTPUT_ALIGNED_COMMON
665 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_slim",
666 (unsigned HOST_WIDE_INT
) 1, 8);
668 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_slim",
669 (unsigned HOST_WIDE_INT
) 1,
670 (unsigned HOST_WIDE_INT
) 1);
675 /* Attach a special .ident directive to the end of the file to identify
676 the version of GCC which compiled this code. The format of the .ident
677 string is patterned after the ones produced by native SVR4 compilers. */
680 const char *pkg_version
= "(GNU) ";
683 if (strcmp ("(GCC) ", pkgversion_string
))
684 pkg_version
= pkgversion_string
;
686 ident_str
= ACONCAT (("GCC: ", pkg_version
, version_string
, NULL
));
687 targetm
.asm_out
.output_ident (ident_str
);
690 /* Auto profile finalization. */
691 if (flag_auto_profile
)
694 /* Invoke registered plugin callbacks. */
695 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT
, NULL
);
697 /* This must be at the end. Some target ports emit end of file directives
698 into the assembly file here, and hence we can not output anything to the
699 assembly file after this point. */
700 targetm
.asm_out
.file_end ();
702 timevar_stop (TV_PHASE_LATE_ASM
);
705 /* Print version information to FILE.
706 Each line begins with INDENT (for the case where FILE is the
707 assembler output file). */
710 print_version (FILE *file
, const char *indent
)
712 static const char fmt1
[] =
714 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
716 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
719 static const char fmt2
[] =
720 N_("GMP version %s, MPFR version %s, MPC version %s\n");
721 static const char fmt3
[] =
722 N_("%s%swarning: %s header version %s differs from library version %s.\n");
723 static const char fmt4
[] =
724 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
726 #define __VERSION__ "[?]"
729 file
== stderr
? _(fmt1
) : fmt1
,
730 indent
, *indent
!= 0 ? " " : "",
731 lang_hooks
.name
, pkgversion_string
, version_string
, TARGET_NAME
,
732 indent
, __VERSION__
);
734 /* We need to stringify the GMP macro values. Ugh, gmp_version has
735 two string formats, "i.j.k" and "i.j" when k is zero. As of
736 gmp-4.3.0, GMP always uses the 3 number format. */
737 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
738 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3 (X)
739 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
740 #define GCC_GMP_VERSION \
741 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
742 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
743 #define GCC_GMP_STRINGIFY_VERSION \
744 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
745 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR)
747 #define GCC_GMP_STRINGIFY_VERSION \
748 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
749 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR) "." \
750 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_PATCHLEVEL)
753 file
== stderr
? _(fmt2
) : fmt2
,
754 GCC_GMP_STRINGIFY_VERSION
, MPFR_VERSION_STRING
, MPC_VERSION_STRING
);
755 if (strcmp (GCC_GMP_STRINGIFY_VERSION
, gmp_version
))
757 file
== stderr
? _(fmt3
) : fmt3
,
758 indent
, *indent
!= 0 ? " " : "",
759 "GMP", GCC_GMP_STRINGIFY_VERSION
, gmp_version
);
760 if (strcmp (MPFR_VERSION_STRING
, mpfr_get_version ()))
762 file
== stderr
? _(fmt3
) : fmt3
,
763 indent
, *indent
!= 0 ? " " : "",
764 "MPFR", MPFR_VERSION_STRING
, mpfr_get_version ());
765 if (strcmp (MPC_VERSION_STRING
, mpc_get_version ()))
767 file
== stderr
? _(fmt3
) : fmt3
,
768 indent
, *indent
!= 0 ? " " : "",
769 "MPC", MPC_VERSION_STRING
, mpc_get_version ());
771 file
== stderr
? _(fmt4
) : fmt4
,
772 indent
, *indent
!= 0 ? " " : "",
773 PARAM_VALUE (GGC_MIN_EXPAND
), PARAM_VALUE (GGC_MIN_HEAPSIZE
));
775 print_plugins_versions (file
, indent
);
779 print_to_asm_out_file (print_switch_type type
, const char * text
)
781 bool prepend_sep
= true;
785 case SWITCH_TYPE_LINE_END
:
786 putc ('\n', asm_out_file
);
789 case SWITCH_TYPE_LINE_START
:
790 fputs (ASM_COMMENT_START
, asm_out_file
);
791 return strlen (ASM_COMMENT_START
);
793 case SWITCH_TYPE_DESCRIPTIVE
:
794 if (ASM_COMMENT_START
[0] == 0)
797 case SWITCH_TYPE_PASSED
:
798 case SWITCH_TYPE_ENABLED
:
800 fputc (' ', asm_out_file
);
801 fputs (text
, asm_out_file
);
802 /* No need to return the length here as
803 print_single_switch has already done it. */
812 print_to_stderr (print_switch_type type
, const char * text
)
816 case SWITCH_TYPE_LINE_END
:
820 case SWITCH_TYPE_LINE_START
:
823 case SWITCH_TYPE_PASSED
:
824 case SWITCH_TYPE_ENABLED
:
828 case SWITCH_TYPE_DESCRIPTIVE
:
829 fputs (text
, stderr
);
830 /* No need to return the length here as
831 print_single_switch has already done it. */
839 /* Print an option value and return the adjusted position in the line.
840 ??? print_fn doesn't handle errors, eg disk full; presumably other
841 code will catch a disk full though. */
844 print_single_switch (print_switch_fn_type print_fn
,
846 print_switch_type type
,
849 /* The ultrix fprintf returns 0 on success, so compute the result
850 we want here since we need it for the following test. The +1
851 is for the separator character that will probably be emitted. */
852 int len
= strlen (text
) + 1;
855 && pos
+ len
> MAX_LINE
)
857 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
862 pos
+= print_fn (SWITCH_TYPE_LINE_START
, NULL
);
864 print_fn (type
, text
);
868 /* Print active target switches using PRINT_FN.
869 POS is the current cursor position and MAX is the size of a "line".
870 Each line begins with INDENT and ends with TERM.
871 Each switch is separated from the next by SEP. */
874 print_switch_values (print_switch_fn_type print_fn
)
879 /* Fill in the -frandom-seed option, if the user didn't pass it, so
880 that it can be printed below. This helps reproducibility. */
881 if (!flag_random_seed
)
884 /* Print the options as passed. */
885 pos
= print_single_switch (print_fn
, pos
,
886 SWITCH_TYPE_DESCRIPTIVE
, _("options passed: "));
888 for (j
= 1; j
< save_decoded_options_count
; j
++)
890 switch (save_decoded_options
[j
].opt_index
)
903 pos
= print_single_switch (print_fn
, pos
, SWITCH_TYPE_PASSED
,
904 save_decoded_options
[j
].orig_option_with_args_text
);
908 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
910 /* Print the -f and -m options that have been enabled.
911 We don't handle language specific options but printing argv
913 pos
= print_single_switch (print_fn
, 0,
914 SWITCH_TYPE_DESCRIPTIVE
, _("options enabled: "));
916 for (j
= 0; j
< cl_options_count
; j
++)
917 if (cl_options
[j
].cl_report
918 && option_enabled (j
, &global_options
) > 0)
919 pos
= print_single_switch (print_fn
, pos
,
920 SWITCH_TYPE_ENABLED
, cl_options
[j
].opt_text
);
922 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
925 /* Open assembly code output file. Do this even if -fsyntax-only is
926 on, because then the driver will have provided the name of a
927 temporary file or bit bucket for us. NAME is the file specified on
928 the command line, possibly NULL. */
930 init_asm_output (const char *name
)
932 if (name
== NULL
&& asm_file_name
== 0)
933 asm_out_file
= stdout
;
936 if (asm_file_name
== 0)
938 int len
= strlen (dump_base_name
);
939 char *dumpname
= XNEWVEC (char, len
+ 6);
941 memcpy (dumpname
, dump_base_name
, len
+ 1);
942 strip_off_ending (dumpname
, len
);
943 strcat (dumpname
, ".s");
944 asm_file_name
= dumpname
;
946 if (!strcmp (asm_file_name
, "-"))
947 asm_out_file
= stdout
;
948 else if (!canonical_filename_eq (asm_file_name
, name
)
949 || !strcmp (asm_file_name
, HOST_BIT_BUCKET
))
950 asm_out_file
= fopen (asm_file_name
, "w");
952 /* Use fatal_error (UNKOWN_LOCATION) instead of just fatal_error to
953 prevent gcc from printing the first line in the current file. */
954 fatal_error (UNKNOWN_LOCATION
,
955 "input file %qs is the same as output file",
957 if (asm_out_file
== 0)
958 fatal_error (UNKNOWN_LOCATION
,
959 "can%'t open %qs for writing: %m", asm_file_name
);
962 if (!flag_syntax_only
)
964 targetm
.asm_out
.file_start ();
966 if (flag_record_gcc_switches
)
968 if (targetm
.asm_out
.record_gcc_switches
)
970 /* Let the target know that we are about to start recording. */
971 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
973 /* Now record the switches. */
974 print_switch_values (targetm
.asm_out
.record_gcc_switches
);
975 /* Let the target know that the recording is over. */
976 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
980 inform (input_location
, "-frecord-gcc-switches is not supported by the current target");
983 if (flag_verbose_asm
)
985 /* Print the list of switches in effect
986 into the assembler file as comments. */
987 print_version (asm_out_file
, ASM_COMMENT_START
);
988 print_switch_values (print_to_asm_out_file
);
989 putc ('\n', asm_out_file
);
994 /* A helper function; used as the reallocator function for cpp's line
997 realloc_for_line_map (void *ptr
, size_t len
)
999 return ggc_realloc (ptr
, len
);
1002 /* A helper function: used as the allocator function for
1003 identifier_to_locale. */
1005 alloc_for_identifier_to_locale (size_t len
)
1007 return ggc_alloc_atomic (len
);
1010 /* Output stack usage information. */
1012 output_stack_usage (void)
1014 static bool warning_issued
= false;
1015 enum stack_usage_kind_type
{ STATIC
= 0, DYNAMIC
, DYNAMIC_BOUNDED
};
1016 const char *stack_usage_kind_str
[] = {
1021 HOST_WIDE_INT stack_usage
= current_function_static_stack_size
;
1022 enum stack_usage_kind_type stack_usage_kind
;
1024 if (stack_usage
< 0)
1026 if (!warning_issued
)
1028 warning (0, "stack usage computation not supported for this target");
1029 warning_issued
= true;
1034 stack_usage_kind
= STATIC
;
1036 /* Add the maximum amount of space pushed onto the stack. */
1037 if (current_function_pushed_stack_size
> 0)
1039 stack_usage
+= current_function_pushed_stack_size
;
1040 stack_usage_kind
= DYNAMIC_BOUNDED
;
1043 /* Now on to the tricky part: dynamic stack allocation. */
1044 if (current_function_allocates_dynamic_stack_space
)
1046 if (current_function_has_unbounded_dynamic_stack_size
)
1047 stack_usage_kind
= DYNAMIC
;
1049 stack_usage_kind
= DYNAMIC_BOUNDED
;
1051 /* Add the size even in the unbounded case, this can't hurt. */
1052 stack_usage
+= current_function_dynamic_stack_size
;
1055 if (flag_stack_usage
)
1057 expanded_location loc
1058 = expand_location (DECL_SOURCE_LOCATION (current_function_decl
));
1059 /* We don't want to print the full qualified name because it can be long,
1060 so we strip the scope prefix, but we may need to deal with the suffix
1061 created by the compiler. */
1063 = strchr (IDENTIFIER_POINTER (DECL_NAME (current_function_decl
)), '.');
1065 = lang_hooks
.decl_printable_name (current_function_decl
, 2);
1068 const char *dot
= strchr (name
, '.');
1069 while (dot
&& strcasecmp (dot
, suffix
) != 0)
1072 dot
= strchr (name
, '.');
1077 const char *dot
= strrchr (name
, '.');
1082 fprintf (stack_usage_file
,
1083 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC
"\t%s\n",
1084 lbasename (loc
.file
),
1089 stack_usage_kind_str
[stack_usage_kind
]);
1092 if (warn_stack_usage
>= 0)
1094 const location_t loc
= DECL_SOURCE_LOCATION (current_function_decl
);
1096 if (stack_usage_kind
== DYNAMIC
)
1097 warning_at (loc
, OPT_Wstack_usage_
, "stack usage might be unbounded");
1098 else if (stack_usage
> warn_stack_usage
)
1100 if (stack_usage_kind
== DYNAMIC_BOUNDED
)
1102 OPT_Wstack_usage_
, "stack usage might be %wd bytes",
1105 warning_at (loc
, OPT_Wstack_usage_
, "stack usage is %wd bytes",
1111 /* Open an auxiliary output file. */
1113 open_auxiliary_file (const char *ext
)
1118 filename
= concat (aux_base_name
, ".", ext
, NULL
);
1119 file
= fopen (filename
, "w");
1121 fatal_error ("can%'t open %s for writing: %m", filename
);
1126 /* Initialization of the front end environment, before command line
1127 options are parsed. Signal handlers, internationalization etc.
1128 ARGV0 is main's argv[0]. */
1130 general_init (const char *argv0
)
1134 p
= argv0
+ strlen (argv0
);
1135 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
1139 xmalloc_set_program_name (progname
);
1143 /* Unlock the stdio streams. */
1144 unlock_std_streams ();
1146 gcc_init_libintl ();
1148 identifier_to_locale_alloc
= alloc_for_identifier_to_locale
;
1149 identifier_to_locale_free
= ggc_free
;
1151 /* Initialize the diagnostics reporting machinery, so option parsing
1152 can give warnings and errors. */
1153 diagnostic_initialize (global_dc
, N_OPTS
);
1154 /* Set a default printer. Language specific initializations will
1155 override it later. */
1156 tree_diagnostics_defaults (global_dc
);
1158 global_dc
->show_caret
1159 = global_options_init
.x_flag_diagnostics_show_caret
;
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 input_location
= UNKNOWN_LOCATION
;
1197 line_table
= ggc_alloc
<line_maps
> ();
1198 linemap_init (line_table
, BUILTINS_LOCATION
);
1199 line_table
->reallocator
= realloc_for_line_map
;
1200 line_table
->round_alloc_size
= ggc_round_alloc_size
;
1203 /* Initialize register usage now so switches may override. */
1206 /* Register the language-independent parameters. */
1207 global_init_params ();
1209 /* This must be done after global_init_params but before argument
1211 init_ggc_heuristics ();
1213 /* Create the singleton holder for global state.
1214 Doing so also creates the pass manager and with it the passes. */
1215 g
= new gcc::context ();
1216 symtab
= ggc_cleared_alloc
<symbol_table
> ();
1218 statistics_early_init ();
1222 /* Return true if the current target supports -fsection-anchors. */
1225 target_supports_section_anchors_p (void)
1227 if (targetm
.min_anchor_offset
== 0 && targetm
.max_anchor_offset
== 0)
1230 if (targetm
.asm_out
.output_anchor
== NULL
)
1236 /* Default the align_* variables to 1 if they're still unset, and
1237 set up the align_*_log variables. */
1239 init_alignments (void)
1241 if (align_loops
<= 0)
1243 if (align_loops_max_skip
> align_loops
)
1244 align_loops_max_skip
= align_loops
- 1;
1245 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
1246 if (align_jumps
<= 0)
1248 if (align_jumps_max_skip
> align_jumps
)
1249 align_jumps_max_skip
= align_jumps
- 1;
1250 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
1251 if (align_labels
<= 0)
1253 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
1254 if (align_labels_max_skip
> align_labels
)
1255 align_labels_max_skip
= align_labels
- 1;
1256 if (align_functions
<= 0)
1257 align_functions
= 1;
1258 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
1261 /* Process the options that have been parsed. */
1263 process_options (void)
1265 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1266 This can happen with incorrect pre-processed input. */
1267 debug_hooks
= &do_nothing_debug_hooks
;
1269 maximum_field_alignment
= initial_max_fld_align
* BITS_PER_UNIT
;
1271 /* If DIAGNOSTICS_COLOR_DEFAULT is -1, default to -fdiagnostics-color=auto
1272 if GCC_COLORS is in the environment, otherwise default to
1273 -fdiagnostics-color=never, for other values default to that
1274 -fdiagnostics-color={never,auto,always}. */
1275 if (!global_options_set
.x_flag_diagnostics_show_color
)
1276 switch ((int) DIAGNOSTICS_COLOR_DEFAULT
)
1279 if (!getenv ("GCC_COLORS"))
1282 case DIAGNOSTICS_COLOR_AUTO
:
1283 pp_show_color (global_dc
->printer
)
1284 = colorize_init (DIAGNOSTICS_COLOR_AUTO
);
1286 case DIAGNOSTICS_COLOR_YES
:
1287 pp_show_color (global_dc
->printer
)
1288 = colorize_init (DIAGNOSTICS_COLOR_YES
);
1294 /* Allow the front end to perform consistency checks and do further
1295 initialization based on the command line options. This hook also
1296 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1297 so we can correctly initialize debug output. */
1298 no_backend
= lang_hooks
.post_options (&main_input_filename
);
1300 /* Set default values for parameters relation to the Scalar Reduction
1301 of Aggregates passes (SRA and IP-SRA). We must do this here, rather
1302 than in opts.c:default_options_optimization as historically these
1303 tuning heuristics have been based on MOVE_RATIO, which on some
1304 targets requires other symbols from the backend. */
1305 maybe_set_param_value
1306 (PARAM_SRA_MAX_SCALARIZATION_SIZE_SPEED
,
1307 get_move_ratio (true) * UNITS_PER_WORD
,
1308 global_options
.x_param_values
, global_options_set
.x_param_values
);
1309 maybe_set_param_value
1310 (PARAM_SRA_MAX_SCALARIZATION_SIZE_SIZE
,
1311 get_move_ratio (false) * UNITS_PER_WORD
,
1312 global_options
.x_param_values
, global_options_set
.x_param_values
);
1314 /* Some machines may reject certain combinations of options. */
1315 targetm
.target_option
.override ();
1317 /* Avoid any informative notes in the second run of -fcompare-debug. */
1318 if (flag_compare_debug
)
1319 diagnostic_inhibit_notes (global_dc
);
1321 if (flag_section_anchors
&& !target_supports_section_anchors_p ())
1323 warning (OPT_fsection_anchors
,
1324 "this target does not support %qs", "-fsection-anchors");
1325 flag_section_anchors
= 0;
1328 if (flag_short_enums
== 2)
1329 flag_short_enums
= targetm
.default_short_enums ();
1331 /* Set aux_base_name if not already set. */
1334 else if (main_input_filename
)
1336 char *name
= xstrdup (lbasename (main_input_filename
));
1338 strip_off_ending (name
, strlen (name
));
1339 aux_base_name
= name
;
1342 aux_base_name
= "gccaux";
1346 || flag_graphite_identity
1348 || flag_loop_interchange
1349 || flag_loop_strip_mine
1350 || flag_loop_parallelize_all
1351 || flag_loop_unroll_jam
)
1352 sorry ("Graphite loop optimizations cannot be used (ISL is not available)"
1353 "(-fgraphite, -fgraphite-identity, -floop-block, "
1354 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1355 "-floop-unroll-and-jam, and -ftree-loop-linear)");
1358 if (flag_check_pointer_bounds
)
1360 if (targetm
.chkp_bound_mode () == VOIDmode
)
1361 error ("-fcheck-pointer-bounds is not supported for this target");
1364 /* One region RA really helps to decrease the code size. */
1365 if (flag_ira_region
== IRA_REGION_AUTODETECT
)
1367 = optimize_size
|| !optimize
? IRA_REGION_ONE
: IRA_REGION_MIXED
;
1369 if (!abi_version_at_least (2))
1371 /* -fabi-version=1 support was removed after GCC 4.9. */
1372 error ("%<-fabi-version=1%> is no longer supported");
1373 flag_abi_version
= 2;
1376 /* Unrolling all loops implies that standard loop unrolling must also
1378 if (flag_unroll_all_loops
)
1379 flag_unroll_loops
= 1;
1381 /* web and rename-registers help when run after loop unrolling. */
1382 if (flag_web
== AUTODETECT_VALUE
)
1383 flag_web
= flag_unroll_loops
|| flag_peel_loops
;
1385 if (flag_rename_registers
== AUTODETECT_VALUE
)
1386 flag_rename_registers
= flag_unroll_loops
|| flag_peel_loops
;
1388 if (flag_non_call_exceptions
)
1389 flag_asynchronous_unwind_tables
= 1;
1390 if (flag_asynchronous_unwind_tables
)
1391 flag_unwind_tables
= 1;
1393 if (flag_value_profile_transformations
)
1394 flag_profile_values
= 1;
1396 /* Warn about options that are not supported on this machine. */
1397 #ifndef INSN_SCHEDULING
1398 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
1399 warning (0, "instruction scheduling not supported on this target machine");
1402 if (flag_delayed_branch
)
1403 warning (0, "this target machine does not have delayed branches");
1406 user_label_prefix
= USER_LABEL_PREFIX
;
1407 if (flag_leading_underscore
!= -1)
1409 /* If the default prefix is more complicated than "" or "_",
1410 issue a warning and ignore this option. */
1411 if (user_label_prefix
[0] == 0 ||
1412 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
1414 user_label_prefix
= flag_leading_underscore
? "_" : "";
1417 warning (0, "-f%sleading-underscore not supported on this target machine",
1418 flag_leading_underscore
? "" : "no-");
1421 /* If we are in verbose mode, write out the version and maybe all the
1422 option flags in use. */
1425 print_version (stderr
, "");
1427 print_switch_values (print_to_stderr
);
1430 if (flag_syntax_only
)
1432 write_symbols
= NO_DEBUG
;
1438 if (debug_info_level
== DINFO_LEVEL_NONE
)
1440 debug_info_level
= DINFO_LEVEL_NORMAL
;
1442 if (write_symbols
== NO_DEBUG
)
1443 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
1446 debug_info_level
= DINFO_LEVEL_NONE
;
1449 if (flag_dump_final_insns
&& !flag_syntax_only
&& !no_backend
)
1451 FILE *final_output
= fopen (flag_dump_final_insns
, "w");
1454 error ("could not open final insn dump file %qs: %m",
1455 flag_dump_final_insns
);
1456 flag_dump_final_insns
= NULL
;
1458 else if (fclose (final_output
))
1460 error ("could not close zeroed insn dump file %qs: %m",
1461 flag_dump_final_insns
);
1462 flag_dump_final_insns
= NULL
;
1466 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1468 if (debug_info_level
== DINFO_LEVEL_NONE
)
1469 write_symbols
= NO_DEBUG
;
1471 if (write_symbols
== NO_DEBUG
)
1473 #if defined(DBX_DEBUGGING_INFO)
1474 else if (write_symbols
== DBX_DEBUG
)
1475 debug_hooks
= &dbx_debug_hooks
;
1477 #if defined(XCOFF_DEBUGGING_INFO)
1478 else if (write_symbols
== XCOFF_DEBUG
)
1479 debug_hooks
= &xcoff_debug_hooks
;
1481 #ifdef SDB_DEBUGGING_INFO
1482 else if (write_symbols
== SDB_DEBUG
)
1483 debug_hooks
= &sdb_debug_hooks
;
1485 #ifdef DWARF2_DEBUGGING_INFO
1486 else if (write_symbols
== DWARF2_DEBUG
)
1487 debug_hooks
= &dwarf2_debug_hooks
;
1489 #ifdef VMS_DEBUGGING_INFO
1490 else if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1491 debug_hooks
= &vmsdbg_debug_hooks
;
1494 error ("target system does not support the %qs debug format",
1495 debug_type_names
[write_symbols
]);
1497 /* We know which debug output will be used so we can set flag_var_tracking
1498 and flag_var_tracking_uninit if the user has not specified them. */
1499 if (debug_info_level
< DINFO_LEVEL_NORMAL
1500 || debug_hooks
->var_location
== do_nothing_debug_hooks
.var_location
)
1502 if (flag_var_tracking
== 1
1503 || flag_var_tracking_uninit
== 1)
1505 if (debug_info_level
< DINFO_LEVEL_NORMAL
)
1506 warning (0, "variable tracking requested, but useless unless "
1507 "producing debug info");
1509 warning (0, "variable tracking requested, but not supported "
1510 "by this debug format");
1512 flag_var_tracking
= 0;
1513 flag_var_tracking_uninit
= 0;
1516 /* The debug hooks are used to implement -fdump-go-spec because it
1517 gives a simple and stable API for all the information we need to
1519 if (flag_dump_go_spec
!= NULL
)
1520 debug_hooks
= dump_go_spec_init (flag_dump_go_spec
, debug_hooks
);
1522 /* If the user specifically requested variable tracking with tagging
1523 uninitialized variables, we need to turn on variable tracking.
1524 (We already determined above that variable tracking is feasible.) */
1525 if (flag_var_tracking_uninit
== 1)
1526 flag_var_tracking
= 1;
1528 if (flag_var_tracking
== AUTODETECT_VALUE
)
1529 flag_var_tracking
= optimize
>= 1;
1531 if (flag_var_tracking_uninit
== AUTODETECT_VALUE
)
1532 flag_var_tracking_uninit
= flag_var_tracking
;
1534 if (flag_var_tracking_assignments
== AUTODETECT_VALUE
)
1535 flag_var_tracking_assignments
= flag_var_tracking
1536 && !(flag_selective_scheduling
|| flag_selective_scheduling2
);
1538 if (flag_var_tracking_assignments_toggle
)
1539 flag_var_tracking_assignments
= !flag_var_tracking_assignments
;
1541 if (flag_var_tracking_assignments
&& !flag_var_tracking
)
1542 flag_var_tracking
= flag_var_tracking_assignments
= -1;
1544 if (flag_var_tracking_assignments
1545 && (flag_selective_scheduling
|| flag_selective_scheduling2
))
1546 warning (0, "var-tracking-assignments changes selective scheduling");
1548 if (flag_tree_cselim
== AUTODETECT_VALUE
)
1549 #ifdef HAVE_conditional_move
1550 flag_tree_cselim
= 1;
1552 flag_tree_cselim
= 0;
1555 /* If auxiliary info generation is desired, open the output file.
1556 This goes in the same directory as the source file--unlike
1557 all the other output files. */
1558 if (flag_gen_aux_info
)
1560 aux_info_file
= fopen (aux_info_file_name
, "w");
1561 if (aux_info_file
== 0)
1562 fatal_error ("can%'t open %s: %m", aux_info_file_name
);
1565 if (!targetm_common
.have_named_sections
)
1567 if (flag_function_sections
)
1569 warning (0, "-ffunction-sections not supported for this target");
1570 flag_function_sections
= 0;
1572 if (flag_data_sections
)
1574 warning (0, "-fdata-sections not supported for this target");
1575 flag_data_sections
= 0;
1579 #ifndef HAVE_prefetch
1580 if (flag_prefetch_loop_arrays
> 0)
1582 warning (0, "-fprefetch-loop-arrays not supported for this target");
1583 flag_prefetch_loop_arrays
= 0;
1586 if (flag_prefetch_loop_arrays
> 0 && !HAVE_prefetch
)
1588 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1589 flag_prefetch_loop_arrays
= 0;
1593 /* This combination of options isn't handled for i386 targets and doesn't
1594 make much sense anyway, so don't allow it. */
1595 if (flag_prefetch_loop_arrays
> 0 && optimize_size
)
1597 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1598 flag_prefetch_loop_arrays
= 0;
1601 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1602 if (flag_signaling_nans
)
1603 flag_trapping_math
= 1;
1605 /* We cannot reassociate if we want traps or signed zeros. */
1606 if (flag_associative_math
&& (flag_trapping_math
|| flag_signed_zeros
))
1608 warning (0, "-fassociative-math disabled; other options take precedence");
1609 flag_associative_math
= 0;
1612 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1613 if (flag_cx_limited_range
)
1614 flag_complex_method
= 0;
1616 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1617 if (flag_cx_fortran_rules
)
1618 flag_complex_method
= 1;
1620 /* Targets must be able to place spill slots at lower addresses. If the
1621 target already uses a soft frame pointer, the transition is trivial. */
1622 if (!FRAME_GROWS_DOWNWARD
&& flag_stack_protect
)
1624 warning (0, "-fstack-protector not supported for this target");
1625 flag_stack_protect
= 0;
1627 if (!flag_stack_protect
)
1628 warn_stack_protect
= 0;
1630 /* Address Sanitizer needs porting to each target architecture. */
1632 if ((flag_sanitize
& SANITIZE_ADDRESS
)
1633 && !FRAME_GROWS_DOWNWARD
)
1636 "-fsanitize=address and -fsanitize=kernel-address "
1637 "are not supported for this target");
1638 flag_sanitize
&= ~SANITIZE_ADDRESS
;
1641 if ((flag_sanitize
& SANITIZE_USER_ADDRESS
)
1642 && targetm
.asan_shadow_offset
== NULL
)
1644 warning (0, "-fsanitize=address not supported for this target");
1645 flag_sanitize
&= ~SANITIZE_ADDRESS
;
1648 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1649 have not been set. */
1650 if (!global_options_set
.x_warnings_are_errors
1651 && warn_coverage_mismatch
1652 && (global_dc
->classify_diagnostic
[OPT_Wcoverage_mismatch
] ==
1654 diagnostic_classify_diagnostic (global_dc
, OPT_Wcoverage_mismatch
,
1655 DK_ERROR
, UNKNOWN_LOCATION
);
1657 /* Save the current optimization options. */
1658 optimization_default_node
= build_optimization_node (&global_options
);
1659 optimization_current_node
= optimization_default_node
;
1662 /* This function can be called multiple times to reinitialize the compiler
1663 back end when register classes or instruction sets have changed,
1664 before each function. */
1666 backend_init_target (void)
1668 /* Initialize alignment variables. */
1671 /* This depends on stack_pointer_rtx. */
1672 init_fake_stack_mems ();
1674 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1676 init_alias_target ();
1678 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1681 /* Depends on the enabled attribute. */
1684 /* The following initialization functions need to generate rtl, so
1685 provide a dummy function context for them. */
1686 init_dummy_function_start ();
1688 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1689 on a mode change. */
1691 init_lower_subreg ();
1694 init_expr_target ();
1697 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1698 after a mode change as well. */
1699 caller_save_initialized_p
= false;
1701 expand_dummy_function_end ();
1704 /* Initialize the compiler back end. This function is called only once,
1705 when starting the compiler. */
1712 init_inline_once ();
1713 init_varasm_once ();
1714 save_register_info ();
1716 /* Middle end needs this initialization for default mem attributes
1717 used by early calls to make_decl_rtl. */
1720 /* Middle end needs this initialization for mode tables used to assign
1721 modes to vector variables. */
1725 /* Initialize excess precision settings. */
1727 init_excess_precision (void)
1729 /* Adjust excess precision handling based on the target options. If
1730 the front end cannot handle it, flag_excess_precision_cmdline
1731 will already have been set accordingly in the post_options
1733 gcc_assert (flag_excess_precision_cmdline
!= EXCESS_PRECISION_DEFAULT
);
1734 flag_excess_precision
= flag_excess_precision_cmdline
;
1735 if (flag_unsafe_math_optimizations
)
1736 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1737 if (flag_excess_precision
== EXCESS_PRECISION_STANDARD
)
1739 int flt_eval_method
= TARGET_FLT_EVAL_METHOD
;
1740 switch (flt_eval_method
)
1744 /* Either the target acts unpredictably (-1) or has all the
1745 operations required not to have excess precision (0). */
1746 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1750 /* In these cases, predictable excess precision makes
1754 /* Any other implementation-defined FLT_EVAL_METHOD values
1755 require the compiler to handle the associated excess
1756 precision rules in excess_precision_type. */
1762 /* Initialize things that are both lang-dependent and target-dependent.
1763 This function can be called more than once if target parameters change. */
1765 lang_dependent_init_target (void)
1767 /* This determines excess precision settings. */
1768 init_excess_precision ();
1770 /* This creates various _DECL nodes, so needs to be called after the
1771 front end is initialized. It also depends on the HAVE_xxx macros
1772 generated from the target machine description. */
1775 gcc_assert (!this_target_rtl
->target_specific_initialized
);
1778 /* Perform initializations that are lang-dependent or target-dependent.
1779 but matters only for late optimizations and RTL generation. */
1781 static int rtl_initialized
;
1784 initialize_rtl (void)
1786 /* Initialization done just once per compilation, but delayed
1787 till code generation. */
1788 if (!rtl_initialized
)
1790 rtl_initialized
= true;
1792 /* Target specific RTL backend initialization. */
1793 if (!this_target_rtl
->target_specific_initialized
)
1795 backend_init_target ();
1796 this_target_rtl
->target_specific_initialized
= true;
1800 /* Language-dependent initialization. Returns nonzero on success. */
1802 lang_dependent_init (const char *name
)
1804 location_t save_loc
= input_location
;
1805 if (dump_base_name
== 0)
1806 dump_base_name
= name
&& name
[0] ? name
: "gccdump";
1808 /* Other front-end initialization. */
1809 input_location
= BUILTINS_LOCATION
;
1810 if (lang_hooks
.init () == 0)
1812 input_location
= save_loc
;
1816 init_asm_output (name
);
1818 /* If stack usage information is desired, open the output file. */
1819 if (flag_stack_usage
)
1820 stack_usage_file
= open_auxiliary_file ("su");
1823 /* This creates various _DECL nodes, so needs to be called after the
1824 front end is initialized. */
1827 /* Do the target-specific parts of the initialization. */
1828 lang_dependent_init_target ();
1832 /* If dbx symbol table desired, initialize writing it and output the
1833 predefined types. */
1834 timevar_push (TV_SYMOUT
);
1836 /* Now we have the correct original filename, we can initialize
1838 (*debug_hooks
->init
) (name
);
1840 timevar_pop (TV_SYMOUT
);
1847 /* Reinitialize everything when target parameters, such as register usage,
1850 target_reinit (void)
1852 struct rtl_data saved_x_rtl
;
1853 rtx
*saved_regno_reg_rtx
;
1854 tree saved_optimization_current_node
;
1855 struct target_optabs
*saved_this_fn_optabs
;
1857 /* Temporarily switch to the default optimization node, so that
1858 *this_target_optabs is set to the default, not reflecting
1859 whatever a previous function used for the optimize
1861 saved_optimization_current_node
= optimization_current_node
;
1862 saved_this_fn_optabs
= this_fn_optabs
;
1863 if (saved_optimization_current_node
!= optimization_default_node
)
1865 optimization_current_node
= optimization_default_node
;
1866 cl_optimization_restore
1868 TREE_OPTIMIZATION (optimization_default_node
));
1870 this_fn_optabs
= this_target_optabs
;
1872 /* Save *crtl and regno_reg_rtx around the reinitialization
1873 to allow target_reinit being called even after prepare_function_start. */
1874 saved_regno_reg_rtx
= regno_reg_rtx
;
1875 if (saved_regno_reg_rtx
)
1877 saved_x_rtl
= *crtl
;
1878 memset (crtl
, '\0', sizeof (*crtl
));
1879 regno_reg_rtx
= NULL
;
1882 this_target_rtl
->target_specific_initialized
= false;
1884 /* This initializes hard_frame_pointer, and calls init_reg_modes_target()
1885 to initialize reg_raw_mode[]. */
1888 /* This invokes target hooks to set fixed_reg[] etc, which is
1892 /* Reinitialize lang-dependent parts. */
1893 lang_dependent_init_target ();
1895 /* Restore the original optimization node. */
1896 if (saved_optimization_current_node
!= optimization_default_node
)
1898 optimization_current_node
= saved_optimization_current_node
;
1899 cl_optimization_restore (&global_options
,
1900 TREE_OPTIMIZATION (optimization_current_node
));
1902 this_fn_optabs
= saved_this_fn_optabs
;
1904 /* Restore regno_reg_rtx at the end, as free_after_compilation from
1905 expand_dummy_function_end clears it. */
1906 if (saved_regno_reg_rtx
)
1908 *crtl
= saved_x_rtl
;
1909 regno_reg_rtx
= saved_regno_reg_rtx
;
1910 saved_regno_reg_rtx
= NULL
;
1915 dump_memory_report (bool final
)
1917 dump_line_table_statistics ();
1918 ggc_print_statistics ();
1919 stringpool_statistics ();
1920 dump_tree_statistics ();
1921 dump_gimple_statistics ();
1922 dump_rtx_statistics ();
1923 dump_alloc_pool_statistics ();
1924 dump_bitmap_statistics ();
1925 dump_vec_loc_statistics ();
1926 dump_ggc_loc_statistics (final
);
1927 dump_alias_stats (stderr
);
1928 dump_pta_stats (stderr
);
1931 /* Clean up: close opened files, etc. */
1934 finalize (bool no_backend
)
1936 /* Close the dump files. */
1937 if (flag_gen_aux_info
)
1939 fclose (aux_info_file
);
1941 unlink (aux_info_file_name
);
1944 /* Close non-debugging input and output files. Take special care to note
1945 whether fclose returns an error, since the pages might still be on the
1946 buffer chain while the file is open. */
1950 if (ferror (asm_out_file
) != 0)
1951 fatal_error ("error writing to %s: %m", asm_file_name
);
1952 if (fclose (asm_out_file
) != 0)
1953 fatal_error ("error closing %s: %m", asm_file_name
);
1956 if (stack_usage_file
)
1957 fclose (stack_usage_file
);
1963 g
->get_passes ()->finish_optimization_passes ();
1969 dump_memory_report (true);
1972 dump_profile_report ();
1974 /* Language-specific end of compilation actions. */
1975 lang_hooks
.finish ();
1979 standard_type_bitsize (int bitsize
)
1981 /* As a special exception, we always want __int128 enabled if possible. */
1984 if (bitsize
== CHAR_TYPE_SIZE
1985 || bitsize
== SHORT_TYPE_SIZE
1986 || bitsize
== INT_TYPE_SIZE
1987 || bitsize
== LONG_TYPE_SIZE
1988 || bitsize
== LONG_LONG_TYPE_SIZE
)
1993 /* Initialize the compiler, and compile the input file. */
1999 /* Don't do any more if an error has already occurred. */
2004 timevar_start (TV_PHASE_SETUP
);
2006 /* This must be run always, because it is needed to compute the FP
2007 predefined macros, such as __LDBL_MAX__, for targets using non
2008 default FP formats. */
2009 init_adjust_machine_modes ();
2010 init_derived_machine_modes ();
2012 /* This must happen after the backend has a chance to process
2013 command line options, but before the parsers are
2015 for (i
= 0; i
< NUM_INT_N_ENTS
; i
++)
2016 if (targetm
.scalar_mode_supported_p (int_n_data
[i
].m
)
2017 && ! standard_type_bitsize (int_n_data
[i
].bitsize
))
2018 int_n_enabled_p
[i
] = true;
2020 int_n_enabled_p
[i
] = false;
2022 /* Set up the back-end if requested. */
2026 /* Language-dependent initialization. Returns true on success. */
2027 if (lang_dependent_init (main_input_filename
))
2029 /* Initialize yet another pass. */
2031 ggc_protect_identifiers
= true;
2033 symtab
->initialize ();
2034 init_final (main_input_filename
);
2035 coverage_init (aux_base_name
);
2037 invoke_plugin_callbacks (PLUGIN_START_UNIT
, NULL
);
2039 timevar_stop (TV_PHASE_SETUP
);
2045 timevar_stop (TV_PHASE_SETUP
);
2048 timevar_start (TV_PHASE_FINALIZE
);
2050 finalize (no_backend
);
2052 timevar_stop (TV_PHASE_FINALIZE
);
2056 toplev::toplev (bool use_TV_TOTAL
)
2057 : m_use_TV_TOTAL (use_TV_TOTAL
)
2059 if (!m_use_TV_TOTAL
)
2065 timevar_stop (TV_TOTAL
);
2066 timevar_print (stderr
);
2070 toplev::start_timevars ()
2072 if (time_report
|| !quiet_flag
|| flag_detailed_statistics
)
2075 timevar_start (TV_TOTAL
);
2078 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2079 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2080 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2082 It is not safe to call this function more than once. */
2085 toplev::main (int argc
, char **argv
)
2087 /* Parsing and gimplification sometimes need quite large stack.
2088 Increase stack size limits if possible. */
2089 stack_limit_increase (64 * 1024 * 1024);
2091 expandargv (&argc
, &argv
);
2093 /* Initialization of GCC's environment, and diagnostics. */
2094 general_init (argv
[0]);
2096 /* One-off initialization of options that does not need to be
2097 repeated when options are added for particular functions. */
2098 init_options_once ();
2100 /* Initialize global options structures; this must be repeated for
2101 each structure used for parsing options. */
2102 init_options_struct (&global_options
, &global_options_set
);
2103 lang_hooks
.init_options_struct (&global_options
);
2105 /* Convert the options to an array. */
2106 decode_cmdline_options_to_array_default_mask (argc
,
2107 CONST_CAST2 (const char **,
2109 &save_decoded_options
,
2110 &save_decoded_options_count
);
2112 /* Perform language-specific options initialization. */
2113 lang_hooks
.init_options (save_decoded_options_count
, save_decoded_options
);
2115 /* Parse the options and do minimal processing; basically just
2116 enough to default flags appropriately. */
2117 decode_options (&global_options
, &global_options_set
,
2118 save_decoded_options
, save_decoded_options_count
,
2119 UNKNOWN_LOCATION
, global_dc
);
2121 handle_common_deferred_options ();
2125 initialize_plugins ();
2128 print_version (stderr
, "");
2131 print_plugins_help (stderr
, "");
2133 /* Exit early if we can (e.g. -help). */
2134 if (!exit_after_options
)
2141 if (warningcount
|| errorcount
|| werrorcount
)
2142 print_ignored_options ();
2144 /* Invoke registered plugin callbacks if any. Some plugins could
2145 emit some diagnostics here. */
2146 invoke_plugin_callbacks (PLUGIN_FINISH
, NULL
);
2148 diagnostic_finish (global_dc
);
2150 finalize_plugins ();
2151 location_adhoc_data_fini (line_table
);
2152 if (seen_error () || werrorcount
)
2153 return (FATAL_EXIT_CODE
);
2155 return (SUCCESS_EXIT_CODE
);
2158 /* For those that want to, this function aims to clean up enough state that
2159 you can call toplev::main again. */
2161 toplev::finalize (void)
2163 rtl_initialized
= false;
2164 this_target_rtl
->target_specific_initialized
= false;
2166 cgraph_c_finalize ();
2167 cgraphunit_c_finalize ();
2168 dwarf2out_c_finalize ();
2170 ipa_cp_c_finalize ();
2171 ipa_reference_c_finalize ();
2172 params_c_finalize ();
2174 finalize_options_struct (&global_options
);
2175 finalize_options_struct (&global_options_set
);
2177 XDELETEVEC (save_decoded_options
);
2179 /* Clean up the context (and pass_manager etc). */