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"
72 #include "opts-diagnostic.h"
74 #include "value-prof.h"
75 #include "alloc-pool.h"
78 #include "tree-ssa-alias.h"
79 #include "internal-fn.h"
80 #include "gimple-expr.h"
83 #include "diagnostic-color.h"
85 #include "pass_manager.h"
88 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
92 #ifdef SDB_DEBUGGING_INFO
96 #ifdef XCOFF_DEBUGGING_INFO
97 #include "xcoffout.h" /* Needed for external data
98 declarations for e.g. AIX 4.x. */
103 static void general_init (const char *);
104 static void do_compile (void);
105 static void process_options (void);
106 static void backend_init (void);
107 static int lang_dependent_init (const char *);
108 static void init_asm_output (const char *);
109 static void finalize (bool);
111 static void crash_signal (int) ATTRIBUTE_NORETURN
;
112 static void compile_file (void);
114 /* True if we don't need a backend (e.g. preprocessing only). */
115 static bool no_backend
;
117 /* Length of line when printing switch values. */
120 /* Decoded options, and number of such options. */
121 struct cl_decoded_option
*save_decoded_options
;
122 unsigned int save_decoded_options_count
;
124 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
125 to optimize in process_options (). */
126 #define AUTODETECT_VALUE 2
128 /* Debug hooks - dependent upon command line options. */
130 const struct gcc_debug_hooks
*debug_hooks
;
132 /* The FUNCTION_DECL for the function currently being compiled,
133 or 0 if between functions. */
134 tree current_function_decl
;
136 /* Set to the FUNC_BEGIN label of the current function, or NULL
138 const char * current_function_func_begin_label
;
140 /* A random sequence of characters, unless overridden by user. */
141 static const char *flag_random_seed
;
143 /* A local time stamp derived from the time of compilation. It will be
144 zero if the system cannot provide a time. It will be -1u, if the
145 user has specified a particular random seed. */
148 /* Random number for this compilation */
149 HOST_WIDE_INT random_seed
;
153 /* When non-NULL, indicates that whenever space is allocated on the
154 stack, the resulting stack pointer must not pass this
155 address---that is, for stacks that grow downward, the stack pointer
156 must always be greater than or equal to this address; for stacks
157 that grow upward, the stack pointer must be less than this address.
158 At present, the rtx may be either a REG or a SYMBOL_REF, although
159 the support provided depends on the backend. */
162 /* True if the user has tagged the function with the 'section'
165 bool user_defined_section_attribute
= false;
167 struct target_flag_state default_target_flag_state
;
168 #if SWITCHABLE_TARGET
169 struct target_flag_state
*this_target_flag_state
= &default_target_flag_state
;
171 #define this_target_flag_state (&default_target_flag_state)
174 /* The user symbol prefix after having resolved same. */
175 const char *user_label_prefix
;
177 /* Output files for assembler code (real compiler output)
178 and debugging dumps. */
182 FILE *stack_usage_file
= NULL
;
184 /* The current working directory of a translation. It's generally the
185 directory from which compilation was initiated, but a preprocessed
186 file may specify the original directory in which it was
189 static const char *src_pwd
;
191 /* Initialize src_pwd with the given string, and return true. If it
192 was already initialized, return false. As a special case, it may
193 be called with a NULL argument to test whether src_pwd has NOT been
197 set_src_pwd (const char *pwd
)
201 if (strcmp (src_pwd
, pwd
) == 0)
207 src_pwd
= xstrdup (pwd
);
211 /* Return the directory from which the translation unit was initiated,
212 in case set_src_pwd() was not called before to assign it a
228 /* Called when the start of a function definition is parsed,
229 this function prints on stderr the name of the function. */
231 announce_function (tree decl
)
235 if (rtl_dump_and_exit
)
236 fprintf (stderr
, "%s ",
237 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl
))));
239 fprintf (stderr
, " %s",
240 identifier_to_locale (lang_hooks
.decl_printable_name (decl
, 2)));
242 pp_needs_newline (global_dc
->printer
) = true;
243 diagnostic_set_last_function (global_dc
, (diagnostic_info
*) NULL
);
247 /* Initialize local_tick with a random number or -1 if
248 flag_random_seed is set. */
251 init_local_tick (void)
253 if (!flag_random_seed
)
255 /* Try urandom first. Time of day is too likely to collide.
256 In case of any error we just use the local tick. */
258 int fd
= open ("/dev/urandom", O_RDONLY
);
261 read (fd
, &random_seed
, sizeof (random_seed
));
265 /* Now get the tick anyways */
266 #ifdef HAVE_GETTIMEOFDAY
270 gettimeofday (&tv
, NULL
);
271 local_tick
= (unsigned) tv
.tv_sec
* 1000 + tv
.tv_usec
/ 1000;
275 time_t now
= time (NULL
);
277 if (now
!= (time_t)-1)
278 local_tick
= (unsigned) now
;
286 /* Set up a default flag_random_seed and local_tick, unless the user
287 already specified one. Must be called after init_local_tick. */
290 init_random_seed (void)
293 random_seed
= local_tick
^ getpid (); /* Old racey fallback method */
296 /* Obtain the random_seed. Unless NOINIT, initialize it if
297 it's not provided in the command line. */
300 get_random_seed (bool noinit
)
302 if (!flag_random_seed
&& !noinit
)
307 /* Modify the random_seed string to VAL. Return its previous
311 set_random_seed (const char *val
)
313 const char *old
= flag_random_seed
;
314 flag_random_seed
= val
;
315 if (flag_random_seed
)
319 /* When the driver passed in a hex number don't crc it again */
320 random_seed
= strtoul (flag_random_seed
, &endp
, 0);
321 if (!(endp
> flag_random_seed
&& *endp
== 0))
322 random_seed
= crc32_string (0, flag_random_seed
);
327 /* Handler for fatal signals, such as SIGSEGV. These are transformed
328 into ICE messages, which is much more user friendly. In case the
329 error printer crashes, reset the signal to prevent infinite recursion. */
332 crash_signal (int signo
)
334 signal (signo
, SIG_DFL
);
336 /* If we crashed while processing an ASM statement, then be a little more
337 graceful. It's most likely the user's fault. */
338 if (this_is_asm_operands
)
340 output_operand_lossage ("unrecoverable error");
341 exit (FATAL_EXIT_CODE
);
344 internal_error ("%s", strsignal (signo
));
347 /* A subroutine of wrapup_global_declarations. We've come to the end of
348 the compilation unit. All deferred variables should be undeferred,
349 and all incomplete decls should be finalized. */
352 wrapup_global_declaration_1 (tree decl
)
354 /* We're not deferring this any longer. Assignment is conditional to
355 avoid needlessly dirtying PCH pages. */
356 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl
), TS_DECL_WITH_VIS
)
357 && DECL_DEFER_OUTPUT (decl
) != 0)
358 DECL_DEFER_OUTPUT (decl
) = 0;
360 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0)
361 lang_hooks
.finish_incomplete_decl (decl
);
364 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
365 needs to be output. Return true if it is output. */
368 wrapup_global_declaration_2 (tree decl
)
370 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
)
371 || (TREE_CODE (decl
) == VAR_DECL
&& DECL_HAS_VALUE_EXPR_P (decl
)))
374 /* Don't write out static consts, unless we still need them.
376 We also keep static consts if not optimizing (for debugging),
377 unless the user specified -fno-keep-static-consts.
378 ??? They might be better written into the debug information.
379 This is possible when using DWARF.
381 A language processor that wants static constants to be always
382 written out (even if it is not used) is responsible for
383 calling rest_of_decl_compilation itself. E.g. the C front-end
384 calls rest_of_decl_compilation from finish_decl.
385 One motivation for this is that is conventional in some
386 environments to write things like:
387 static const char rcsid[] = "... version string ...";
388 intending to force the string to be in the executable.
390 A language processor that would prefer to have unneeded
391 static constants "optimized away" would just defer writing
392 them out until here. E.g. C++ does this, because static
393 constants are often defined in header files.
395 ??? A tempting alternative (for both C and C++) would be
396 to force a constant to be written if and only if it is
397 defined in a main file, as opposed to an include file. */
399 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
403 node
= varpool_node::get (decl
);
405 if (!node
&& flag_ltrans
)
407 else if (node
&& node
->definition
)
409 else if (node
&& node
->alias
)
411 else if (!symtab
->global_info_ready
413 || TREE_USED (DECL_ASSEMBLER_NAME (decl
))))
415 else if (node
&& node
->analyzed
)
417 else if (DECL_COMDAT (decl
))
419 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
420 && (optimize
|| !flag_keep_static_consts
421 || DECL_ARTIFICIAL (decl
)))
426 rest_of_decl_compilation (decl
, 1, 1);
434 /* Do any final processing required for the declarations in VEC, of
435 which there are LEN. We write out inline functions and variables
436 that have been deferred until this point, but which are required.
437 Returns nonzero if anything was put out. */
440 wrapup_global_declarations (tree
*vec
, int len
)
442 bool reconsider
, output_something
= false;
445 for (i
= 0; i
< len
; i
++)
446 wrapup_global_declaration_1 (vec
[i
]);
448 /* Now emit any global variables or functions that we have been
449 putting off. We need to loop in case one of the things emitted
450 here references another one which comes earlier in the list. */
454 for (i
= 0; i
< len
; i
++)
455 reconsider
|= wrapup_global_declaration_2 (vec
[i
]);
457 output_something
= true;
461 return output_something
;
464 /* A subroutine of check_global_declarations. Issue appropriate warnings
465 for the global declaration DECL. */
468 check_global_declaration_1 (tree decl
)
470 /* Warn about any function declared static but not defined. We don't
471 warn about variables, because many programs have static variables
472 that exist only to get some text into the object file. */
473 if (TREE_CODE (decl
) == FUNCTION_DECL
474 && DECL_INITIAL (decl
) == 0
475 && DECL_EXTERNAL (decl
)
476 && ! DECL_ARTIFICIAL (decl
)
477 && ! TREE_NO_WARNING (decl
)
478 && ! TREE_PUBLIC (decl
)
479 && (warn_unused_function
480 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
482 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
483 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
485 warning (OPT_Wunused_function
, "%q+F declared %<static%> but never defined", decl
);
486 /* This symbol is effectively an "extern" declaration now. */
487 TREE_PUBLIC (decl
) = 1;
490 /* Warn about static fns or vars defined but not used. */
491 if (((warn_unused_function
&& TREE_CODE (decl
) == FUNCTION_DECL
)
492 /* We don't warn about "static const" variables because the
493 "rcs_id" idiom uses that construction. */
494 || (warn_unused_variable
495 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
496 && ! DECL_IN_SYSTEM_HEADER (decl
)
497 && ! TREE_USED (decl
)
498 /* The TREE_USED bit for file-scope decls is kept in the identifier,
499 to handle multiple external decls in different scopes. */
500 && ! (DECL_NAME (decl
) && TREE_USED (DECL_NAME (decl
)))
501 && ! DECL_EXTERNAL (decl
)
502 && ! TREE_PUBLIC (decl
)
503 /* A volatile variable might be used in some non-obvious way. */
504 && ! TREE_THIS_VOLATILE (decl
)
505 /* Global register variables must be declared to reserve them. */
506 && ! (TREE_CODE (decl
) == VAR_DECL
&& DECL_REGISTER (decl
))
507 /* Otherwise, ask the language. */
508 && lang_hooks
.decls
.warn_unused_global (decl
))
509 warning ((TREE_CODE (decl
) == FUNCTION_DECL
)
510 ? OPT_Wunused_function
511 : OPT_Wunused_variable
,
512 "%q+D defined but not used", decl
);
515 /* Issue appropriate warnings for the global declarations in V (of
516 which there are LEN). */
519 check_global_declarations (tree
*v
, int len
)
523 for (i
= 0; i
< len
; i
++)
524 check_global_declaration_1 (v
[i
]);
527 /* Emit debugging information for all global declarations in VEC. */
530 emit_debug_global_declarations (tree
*vec
, int len
)
534 /* Avoid confusing the debug information machinery when there are errors. */
538 timevar_push (TV_SYMOUT
);
539 for (i
= 0; i
< len
; i
++)
540 debug_hooks
->global_decl (vec
[i
]);
541 timevar_pop (TV_SYMOUT
);
544 /* Compile an entire translation unit. Write a file of assembly
545 output and various debugging dumps. */
550 timevar_start (TV_PHASE_PARSING
);
551 timevar_push (TV_PARSE_GLOBAL
);
553 /* Call the parser, which parses the entire file (calling
554 rest_of_compilation for each function). */
555 lang_hooks
.parse_file ();
557 timevar_pop (TV_PARSE_GLOBAL
);
558 timevar_stop (TV_PHASE_PARSING
);
560 /* Compilation is now finished except for writing
561 what's left of the symbol table output. */
563 if (flag_syntax_only
|| flag_wpa
)
566 ggc_protect_identifiers
= false;
568 /* This must also call finalize_compilation_unit. */
569 lang_hooks
.decls
.final_write_globals ();
574 timevar_start (TV_PHASE_LATE_ASM
);
576 /* Compilation unit is finalized. When producing non-fat LTO object, we are
577 basically finished. */
578 if (in_lto_p
|| !flag_lto
|| flag_fat_lto_objects
)
580 /* File-scope initialization for AddressSanitizer. */
581 if (flag_sanitize
& SANITIZE_ADDRESS
)
584 if (flag_sanitize
& SANITIZE_THREAD
)
587 output_shared_constant_pool ();
588 output_object_blocks ();
589 finish_tm_clone_pairs ();
591 /* Write out any pending weak symbol declarations. */
594 /* This must be at the end before unwind and debug info.
595 Some target ports emit PIC setup thunks here. */
596 targetm
.asm_out
.code_end ();
598 /* Do dbx symbols. */
599 timevar_push (TV_SYMOUT
);
601 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
602 if (dwarf2out_do_frame ())
603 dwarf2out_frame_finish ();
606 (*debug_hooks
->finish
) (main_input_filename
);
607 timevar_pop (TV_SYMOUT
);
609 /* Output some stuff at end of file if nec. */
611 dw2_output_indirect_constants ();
613 /* Flush any pending external directives. */
614 process_pending_assemble_externals ();
617 /* Emit LTO marker if LTO info has been previously emitted. This is
618 used by collect2 to determine whether an object file contains IL.
619 We used to emit an undefined reference here, but this produces
620 link errors if an object file with IL is stored into a shared
621 library without invoking lto1. */
622 if (flag_generate_lto
)
624 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
625 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
,
627 (unsigned HOST_WIDE_INT
) 1, 8);
628 #elif defined ASM_OUTPUT_ALIGNED_COMMON
629 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_v1",
630 (unsigned HOST_WIDE_INT
) 1, 8);
632 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_v1",
633 (unsigned HOST_WIDE_INT
) 1,
634 (unsigned HOST_WIDE_INT
) 1);
636 /* Let linker plugin know that this is a slim object and must be LTOed
637 even when user did not ask for it. */
638 if (!flag_fat_lto_objects
)
640 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
641 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
,
643 (unsigned HOST_WIDE_INT
) 1, 8);
644 #elif defined ASM_OUTPUT_ALIGNED_COMMON
645 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_slim",
646 (unsigned HOST_WIDE_INT
) 1, 8);
648 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_slim",
649 (unsigned HOST_WIDE_INT
) 1,
650 (unsigned HOST_WIDE_INT
) 1);
655 /* Attach a special .ident directive to the end of the file to identify
656 the version of GCC which compiled this code. The format of the .ident
657 string is patterned after the ones produced by native SVR4 compilers. */
660 const char *pkg_version
= "(GNU) ";
663 if (strcmp ("(GCC) ", pkgversion_string
))
664 pkg_version
= pkgversion_string
;
666 ident_str
= ACONCAT (("GCC: ", pkg_version
, version_string
, NULL
));
667 targetm
.asm_out
.output_ident (ident_str
);
670 /* Invoke registered plugin callbacks. */
671 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT
, NULL
);
673 /* This must be at the end. Some target ports emit end of file directives
674 into the assembly file here, and hence we can not output anything to the
675 assembly file after this point. */
676 targetm
.asm_out
.file_end ();
678 timevar_stop (TV_PHASE_LATE_ASM
);
681 /* Print version information to FILE.
682 Each line begins with INDENT (for the case where FILE is the
683 assembler output file). */
686 print_version (FILE *file
, const char *indent
)
688 static const char fmt1
[] =
690 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
692 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
695 static const char fmt2
[] =
696 N_("GMP version %s, MPFR version %s, MPC version %s\n");
697 static const char fmt3
[] =
698 N_("%s%swarning: %s header version %s differs from library version %s.\n");
699 static const char fmt4
[] =
700 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
702 #define __VERSION__ "[?]"
705 file
== stderr
? _(fmt1
) : fmt1
,
706 indent
, *indent
!= 0 ? " " : "",
707 lang_hooks
.name
, pkgversion_string
, version_string
, TARGET_NAME
,
708 indent
, __VERSION__
);
710 /* We need to stringify the GMP macro values. Ugh, gmp_version has
711 two string formats, "i.j.k" and "i.j" when k is zero. As of
712 gmp-4.3.0, GMP always uses the 3 number format. */
713 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
714 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3 (X)
715 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
716 #define GCC_GMP_VERSION \
717 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
718 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
719 #define GCC_GMP_STRINGIFY_VERSION \
720 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
721 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR)
723 #define GCC_GMP_STRINGIFY_VERSION \
724 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
725 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR) "." \
726 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_PATCHLEVEL)
729 file
== stderr
? _(fmt2
) : fmt2
,
730 GCC_GMP_STRINGIFY_VERSION
, MPFR_VERSION_STRING
, MPC_VERSION_STRING
);
731 if (strcmp (GCC_GMP_STRINGIFY_VERSION
, gmp_version
))
733 file
== stderr
? _(fmt3
) : fmt3
,
734 indent
, *indent
!= 0 ? " " : "",
735 "GMP", GCC_GMP_STRINGIFY_VERSION
, gmp_version
);
736 if (strcmp (MPFR_VERSION_STRING
, mpfr_get_version ()))
738 file
== stderr
? _(fmt3
) : fmt3
,
739 indent
, *indent
!= 0 ? " " : "",
740 "MPFR", MPFR_VERSION_STRING
, mpfr_get_version ());
741 if (strcmp (MPC_VERSION_STRING
, mpc_get_version ()))
743 file
== stderr
? _(fmt3
) : fmt3
,
744 indent
, *indent
!= 0 ? " " : "",
745 "MPC", MPC_VERSION_STRING
, mpc_get_version ());
747 file
== stderr
? _(fmt4
) : fmt4
,
748 indent
, *indent
!= 0 ? " " : "",
749 PARAM_VALUE (GGC_MIN_EXPAND
), PARAM_VALUE (GGC_MIN_HEAPSIZE
));
751 print_plugins_versions (file
, indent
);
755 print_to_asm_out_file (print_switch_type type
, const char * text
)
757 bool prepend_sep
= true;
761 case SWITCH_TYPE_LINE_END
:
762 putc ('\n', asm_out_file
);
765 case SWITCH_TYPE_LINE_START
:
766 fputs (ASM_COMMENT_START
, asm_out_file
);
767 return strlen (ASM_COMMENT_START
);
769 case SWITCH_TYPE_DESCRIPTIVE
:
770 if (ASM_COMMENT_START
[0] == 0)
773 case SWITCH_TYPE_PASSED
:
774 case SWITCH_TYPE_ENABLED
:
776 fputc (' ', asm_out_file
);
777 fputs (text
, asm_out_file
);
778 /* No need to return the length here as
779 print_single_switch has already done it. */
788 print_to_stderr (print_switch_type type
, const char * text
)
792 case SWITCH_TYPE_LINE_END
:
796 case SWITCH_TYPE_LINE_START
:
799 case SWITCH_TYPE_PASSED
:
800 case SWITCH_TYPE_ENABLED
:
804 case SWITCH_TYPE_DESCRIPTIVE
:
805 fputs (text
, stderr
);
806 /* No need to return the length here as
807 print_single_switch has already done it. */
815 /* Print an option value and return the adjusted position in the line.
816 ??? print_fn doesn't handle errors, eg disk full; presumably other
817 code will catch a disk full though. */
820 print_single_switch (print_switch_fn_type print_fn
,
822 print_switch_type type
,
825 /* The ultrix fprintf returns 0 on success, so compute the result
826 we want here since we need it for the following test. The +1
827 is for the separator character that will probably be emitted. */
828 int len
= strlen (text
) + 1;
831 && pos
+ len
> MAX_LINE
)
833 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
838 pos
+= print_fn (SWITCH_TYPE_LINE_START
, NULL
);
840 print_fn (type
, text
);
844 /* Print active target switches using PRINT_FN.
845 POS is the current cursor position and MAX is the size of a "line".
846 Each line begins with INDENT and ends with TERM.
847 Each switch is separated from the next by SEP. */
850 print_switch_values (print_switch_fn_type print_fn
)
855 /* Fill in the -frandom-seed option, if the user didn't pass it, so
856 that it can be printed below. This helps reproducibility. */
857 if (!flag_random_seed
)
860 /* Print the options as passed. */
861 pos
= print_single_switch (print_fn
, pos
,
862 SWITCH_TYPE_DESCRIPTIVE
, _("options passed: "));
864 for (j
= 1; j
< save_decoded_options_count
; j
++)
866 switch (save_decoded_options
[j
].opt_index
)
879 pos
= print_single_switch (print_fn
, pos
, SWITCH_TYPE_PASSED
,
880 save_decoded_options
[j
].orig_option_with_args_text
);
884 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
886 /* Print the -f and -m options that have been enabled.
887 We don't handle language specific options but printing argv
889 pos
= print_single_switch (print_fn
, 0,
890 SWITCH_TYPE_DESCRIPTIVE
, _("options enabled: "));
892 for (j
= 0; j
< cl_options_count
; j
++)
893 if (cl_options
[j
].cl_report
894 && option_enabled (j
, &global_options
) > 0)
895 pos
= print_single_switch (print_fn
, pos
,
896 SWITCH_TYPE_ENABLED
, cl_options
[j
].opt_text
);
898 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
901 /* Open assembly code output file. Do this even if -fsyntax-only is
902 on, because then the driver will have provided the name of a
903 temporary file or bit bucket for us. NAME is the file specified on
904 the command line, possibly NULL. */
906 init_asm_output (const char *name
)
908 if (name
== NULL
&& asm_file_name
== 0)
909 asm_out_file
= stdout
;
912 if (asm_file_name
== 0)
914 int len
= strlen (dump_base_name
);
915 char *dumpname
= XNEWVEC (char, len
+ 6);
917 memcpy (dumpname
, dump_base_name
, len
+ 1);
918 strip_off_ending (dumpname
, len
);
919 strcat (dumpname
, ".s");
920 asm_file_name
= dumpname
;
922 if (!strcmp (asm_file_name
, "-"))
923 asm_out_file
= stdout
;
925 asm_out_file
= fopen (asm_file_name
, "w");
926 if (asm_out_file
== 0)
927 fatal_error ("can%'t open %s for writing: %m", asm_file_name
);
930 if (!flag_syntax_only
)
932 targetm
.asm_out
.file_start ();
934 if (flag_record_gcc_switches
)
936 if (targetm
.asm_out
.record_gcc_switches
)
938 /* Let the target know that we are about to start recording. */
939 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
941 /* Now record the switches. */
942 print_switch_values (targetm
.asm_out
.record_gcc_switches
);
943 /* Let the target know that the recording is over. */
944 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
948 inform (input_location
, "-frecord-gcc-switches is not supported by the current target");
951 if (flag_verbose_asm
)
953 /* Print the list of switches in effect
954 into the assembler file as comments. */
955 print_version (asm_out_file
, ASM_COMMENT_START
);
956 print_switch_values (print_to_asm_out_file
);
957 putc ('\n', asm_out_file
);
962 /* A helper function; used as the reallocator function for cpp's line
965 realloc_for_line_map (void *ptr
, size_t len
)
967 return ggc_realloc (ptr
, len
);
970 /* A helper function: used as the allocator function for
971 identifier_to_locale. */
973 alloc_for_identifier_to_locale (size_t len
)
975 return ggc_alloc_atomic (len
);
978 /* Output stack usage information. */
980 output_stack_usage (void)
982 static bool warning_issued
= false;
983 enum stack_usage_kind_type
{ STATIC
= 0, DYNAMIC
, DYNAMIC_BOUNDED
};
984 const char *stack_usage_kind_str
[] = {
989 HOST_WIDE_INT stack_usage
= current_function_static_stack_size
;
990 enum stack_usage_kind_type stack_usage_kind
;
996 warning (0, "stack usage computation not supported for this target");
997 warning_issued
= true;
1002 stack_usage_kind
= STATIC
;
1004 /* Add the maximum amount of space pushed onto the stack. */
1005 if (current_function_pushed_stack_size
> 0)
1007 stack_usage
+= current_function_pushed_stack_size
;
1008 stack_usage_kind
= DYNAMIC_BOUNDED
;
1011 /* Now on to the tricky part: dynamic stack allocation. */
1012 if (current_function_allocates_dynamic_stack_space
)
1014 if (current_function_has_unbounded_dynamic_stack_size
)
1015 stack_usage_kind
= DYNAMIC
;
1017 stack_usage_kind
= DYNAMIC_BOUNDED
;
1019 /* Add the size even in the unbounded case, this can't hurt. */
1020 stack_usage
+= current_function_dynamic_stack_size
;
1023 if (flag_stack_usage
)
1025 expanded_location loc
1026 = expand_location (DECL_SOURCE_LOCATION (current_function_decl
));
1027 /* We don't want to print the full qualified name because it can be long,
1028 so we strip the scope prefix, but we may need to deal with the suffix
1029 created by the compiler. */
1031 = strchr (IDENTIFIER_POINTER (DECL_NAME (current_function_decl
)), '.');
1033 = lang_hooks
.decl_printable_name (current_function_decl
, 2);
1036 const char *dot
= strchr (name
, '.');
1037 while (dot
&& strcasecmp (dot
, suffix
) != 0)
1040 dot
= strchr (name
, '.');
1045 const char *dot
= strrchr (name
, '.');
1050 fprintf (stack_usage_file
,
1051 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC
"\t%s\n",
1052 lbasename (loc
.file
),
1057 stack_usage_kind_str
[stack_usage_kind
]);
1060 if (warn_stack_usage
>= 0)
1062 const location_t loc
= DECL_SOURCE_LOCATION (current_function_decl
);
1064 if (stack_usage_kind
== DYNAMIC
)
1065 warning_at (loc
, OPT_Wstack_usage_
, "stack usage might be unbounded");
1066 else if (stack_usage
> warn_stack_usage
)
1068 if (stack_usage_kind
== DYNAMIC_BOUNDED
)
1070 OPT_Wstack_usage_
, "stack usage might be %wd bytes",
1073 warning_at (loc
, OPT_Wstack_usage_
, "stack usage is %wd bytes",
1079 /* Open an auxiliary output file. */
1081 open_auxiliary_file (const char *ext
)
1086 filename
= concat (aux_base_name
, ".", ext
, NULL
);
1087 file
= fopen (filename
, "w");
1089 fatal_error ("can%'t open %s for writing: %m", filename
);
1094 /* Initialization of the front end environment, before command line
1095 options are parsed. Signal handlers, internationalization etc.
1096 ARGV0 is main's argv[0]. */
1098 general_init (const char *argv0
)
1102 p
= argv0
+ strlen (argv0
);
1103 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
1107 xmalloc_set_program_name (progname
);
1111 /* Unlock the stdio streams. */
1112 unlock_std_streams ();
1114 gcc_init_libintl ();
1116 identifier_to_locale_alloc
= alloc_for_identifier_to_locale
;
1117 identifier_to_locale_free
= ggc_free
;
1119 /* Initialize the diagnostics reporting machinery, so option parsing
1120 can give warnings and errors. */
1121 diagnostic_initialize (global_dc
, N_OPTS
);
1122 /* Set a default printer. Language specific initializations will
1123 override it later. */
1124 tree_diagnostics_defaults (global_dc
);
1126 global_dc
->show_caret
1127 = global_options_init
.x_flag_diagnostics_show_caret
;
1128 global_dc
->show_option_requested
1129 = global_options_init
.x_flag_diagnostics_show_option
;
1130 global_dc
->show_column
1131 = global_options_init
.x_flag_show_column
;
1132 global_dc
->internal_error
= plugins_internal_error_function
;
1133 global_dc
->option_enabled
= option_enabled
;
1134 global_dc
->option_state
= &global_options
;
1135 global_dc
->option_name
= option_name
;
1137 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1139 signal (SIGSEGV
, crash_signal
);
1142 signal (SIGILL
, crash_signal
);
1145 signal (SIGBUS
, crash_signal
);
1148 signal (SIGABRT
, crash_signal
);
1150 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1151 signal (SIGIOT
, crash_signal
);
1154 signal (SIGFPE
, crash_signal
);
1157 /* Other host-specific signal setup. */
1158 (*host_hooks
.extra_signals
)();
1160 /* Initialize the garbage-collector, string pools and tree type hash
1164 line_table
= ggc_alloc
<line_maps
> ();
1165 linemap_init (line_table
, BUILTINS_LOCATION
);
1166 line_table
->reallocator
= realloc_for_line_map
;
1167 line_table
->round_alloc_size
= ggc_round_alloc_size
;
1170 /* Initialize register usage now so switches may override. */
1173 /* Register the language-independent parameters. */
1174 global_init_params ();
1176 /* This must be done after global_init_params but before argument
1178 init_ggc_heuristics ();
1180 /* Create the singleton holder for global state.
1181 Doing so also creates the pass manager and with it the passes. */
1182 g
= new gcc::context ();
1183 symtab
= ggc_cleared_alloc
<symbol_table
> ();
1185 statistics_early_init ();
1189 /* Return true if the current target supports -fsection-anchors. */
1192 target_supports_section_anchors_p (void)
1194 if (targetm
.min_anchor_offset
== 0 && targetm
.max_anchor_offset
== 0)
1197 if (targetm
.asm_out
.output_anchor
== NULL
)
1203 /* Default the align_* variables to 1 if they're still unset, and
1204 set up the align_*_log variables. */
1206 init_alignments (void)
1208 if (align_loops
<= 0)
1210 if (align_loops_max_skip
> align_loops
)
1211 align_loops_max_skip
= align_loops
- 1;
1212 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
1213 if (align_jumps
<= 0)
1215 if (align_jumps_max_skip
> align_jumps
)
1216 align_jumps_max_skip
= align_jumps
- 1;
1217 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
1218 if (align_labels
<= 0)
1220 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
1221 if (align_labels_max_skip
> align_labels
)
1222 align_labels_max_skip
= align_labels
- 1;
1223 if (align_functions
<= 0)
1224 align_functions
= 1;
1225 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
1228 /* Process the options that have been parsed. */
1230 process_options (void)
1232 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1233 This can happen with incorrect pre-processed input. */
1234 debug_hooks
= &do_nothing_debug_hooks
;
1236 maximum_field_alignment
= initial_max_fld_align
* BITS_PER_UNIT
;
1238 /* Default to -fdiagnostics-color=auto if GCC_COLORS is in the environment,
1239 otherwise default to -fdiagnostics-color=never. */
1240 if (!global_options_set
.x_flag_diagnostics_show_color
1241 && getenv ("GCC_COLORS"))
1242 pp_show_color (global_dc
->printer
)
1243 = colorize_init (DIAGNOSTICS_COLOR_AUTO
);
1245 /* Allow the front end to perform consistency checks and do further
1246 initialization based on the command line options. This hook also
1247 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1248 so we can correctly initialize debug output. */
1249 no_backend
= lang_hooks
.post_options (&main_input_filename
);
1251 /* Some machines may reject certain combinations of options. */
1252 targetm
.target_option
.override ();
1254 /* Avoid any informative notes in the second run of -fcompare-debug. */
1255 if (flag_compare_debug
)
1256 diagnostic_inhibit_notes (global_dc
);
1258 if (flag_section_anchors
&& !target_supports_section_anchors_p ())
1260 warning (OPT_fsection_anchors
,
1261 "this target does not support %qs", "-fsection-anchors");
1262 flag_section_anchors
= 0;
1265 if (flag_short_enums
== 2)
1266 flag_short_enums
= targetm
.default_short_enums ();
1268 /* Set aux_base_name if not already set. */
1271 else if (main_input_filename
)
1273 char *name
= xstrdup (lbasename (main_input_filename
));
1275 strip_off_ending (name
, strlen (name
));
1276 aux_base_name
= name
;
1279 aux_base_name
= "gccaux";
1283 || flag_graphite_identity
1285 || flag_loop_interchange
1286 || flag_loop_strip_mine
1287 || flag_loop_parallelize_all
)
1288 sorry ("Graphite loop optimizations cannot be used (ISL is not available)"
1289 "(-fgraphite, -fgraphite-identity, -floop-block, "
1290 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1291 "and -ftree-loop-linear)");
1294 /* One region RA really helps to decrease the code size. */
1295 if (flag_ira_region
== IRA_REGION_AUTODETECT
)
1297 = optimize_size
|| !optimize
? IRA_REGION_ONE
: IRA_REGION_MIXED
;
1299 if (!abi_version_at_least (2))
1301 /* -fabi-version=1 support was removed after GCC 4.9. */
1302 error ("%<-fabi-version=1%> is no longer supported");
1303 flag_abi_version
= 2;
1306 /* Unrolling all loops implies that standard loop unrolling must also
1308 if (flag_unroll_all_loops
)
1309 flag_unroll_loops
= 1;
1311 /* web and rename-registers help when run after loop unrolling. */
1312 if (flag_web
== AUTODETECT_VALUE
)
1313 flag_web
= flag_unroll_loops
|| flag_peel_loops
;
1315 if (flag_rename_registers
== AUTODETECT_VALUE
)
1316 flag_rename_registers
= flag_unroll_loops
|| flag_peel_loops
;
1318 if (flag_non_call_exceptions
)
1319 flag_asynchronous_unwind_tables
= 1;
1320 if (flag_asynchronous_unwind_tables
)
1321 flag_unwind_tables
= 1;
1323 if (flag_value_profile_transformations
)
1324 flag_profile_values
= 1;
1326 /* Warn about options that are not supported on this machine. */
1327 #ifndef INSN_SCHEDULING
1328 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
1329 warning (0, "instruction scheduling not supported on this target machine");
1332 if (flag_delayed_branch
)
1333 warning (0, "this target machine does not have delayed branches");
1336 user_label_prefix
= USER_LABEL_PREFIX
;
1337 if (flag_leading_underscore
!= -1)
1339 /* If the default prefix is more complicated than "" or "_",
1340 issue a warning and ignore this option. */
1341 if (user_label_prefix
[0] == 0 ||
1342 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
1344 user_label_prefix
= flag_leading_underscore
? "_" : "";
1347 warning (0, "-f%sleading-underscore not supported on this target machine",
1348 flag_leading_underscore
? "" : "no-");
1351 /* If we are in verbose mode, write out the version and maybe all the
1352 option flags in use. */
1355 print_version (stderr
, "");
1357 print_switch_values (print_to_stderr
);
1360 if (flag_syntax_only
)
1362 write_symbols
= NO_DEBUG
;
1368 if (debug_info_level
== DINFO_LEVEL_NONE
)
1370 debug_info_level
= DINFO_LEVEL_NORMAL
;
1372 if (write_symbols
== NO_DEBUG
)
1373 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
1376 debug_info_level
= DINFO_LEVEL_NONE
;
1379 if (flag_dump_final_insns
&& !flag_syntax_only
&& !no_backend
)
1381 FILE *final_output
= fopen (flag_dump_final_insns
, "w");
1384 error ("could not open final insn dump file %qs: %m",
1385 flag_dump_final_insns
);
1386 flag_dump_final_insns
= NULL
;
1388 else if (fclose (final_output
))
1390 error ("could not close zeroed insn dump file %qs: %m",
1391 flag_dump_final_insns
);
1392 flag_dump_final_insns
= NULL
;
1396 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1398 if (debug_info_level
== DINFO_LEVEL_NONE
)
1399 write_symbols
= NO_DEBUG
;
1401 if (write_symbols
== NO_DEBUG
)
1403 #if defined(DBX_DEBUGGING_INFO)
1404 else if (write_symbols
== DBX_DEBUG
)
1405 debug_hooks
= &dbx_debug_hooks
;
1407 #if defined(XCOFF_DEBUGGING_INFO)
1408 else if (write_symbols
== XCOFF_DEBUG
)
1409 debug_hooks
= &xcoff_debug_hooks
;
1411 #ifdef SDB_DEBUGGING_INFO
1412 else if (write_symbols
== SDB_DEBUG
)
1413 debug_hooks
= &sdb_debug_hooks
;
1415 #ifdef DWARF2_DEBUGGING_INFO
1416 else if (write_symbols
== DWARF2_DEBUG
)
1417 debug_hooks
= &dwarf2_debug_hooks
;
1419 #ifdef VMS_DEBUGGING_INFO
1420 else if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1421 debug_hooks
= &vmsdbg_debug_hooks
;
1424 error ("target system does not support the \"%s\" debug format",
1425 debug_type_names
[write_symbols
]);
1427 /* We know which debug output will be used so we can set flag_var_tracking
1428 and flag_var_tracking_uninit if the user has not specified them. */
1429 if (debug_info_level
< DINFO_LEVEL_NORMAL
1430 || debug_hooks
->var_location
== do_nothing_debug_hooks
.var_location
)
1432 if (flag_var_tracking
== 1
1433 || flag_var_tracking_uninit
== 1)
1435 if (debug_info_level
< DINFO_LEVEL_NORMAL
)
1436 warning (0, "variable tracking requested, but useless unless "
1437 "producing debug info");
1439 warning (0, "variable tracking requested, but not supported "
1440 "by this debug format");
1442 flag_var_tracking
= 0;
1443 flag_var_tracking_uninit
= 0;
1446 /* The debug hooks are used to implement -fdump-go-spec because it
1447 gives a simple and stable API for all the information we need to
1449 if (flag_dump_go_spec
!= NULL
)
1450 debug_hooks
= dump_go_spec_init (flag_dump_go_spec
, debug_hooks
);
1452 /* If the user specifically requested variable tracking with tagging
1453 uninitialized variables, we need to turn on variable tracking.
1454 (We already determined above that variable tracking is feasible.) */
1455 if (flag_var_tracking_uninit
== 1)
1456 flag_var_tracking
= 1;
1458 if (flag_var_tracking
== AUTODETECT_VALUE
)
1459 flag_var_tracking
= optimize
>= 1;
1461 if (flag_var_tracking_uninit
== AUTODETECT_VALUE
)
1462 flag_var_tracking_uninit
= flag_var_tracking
;
1464 if (flag_var_tracking_assignments
== AUTODETECT_VALUE
)
1465 flag_var_tracking_assignments
= flag_var_tracking
1466 && !(flag_selective_scheduling
|| flag_selective_scheduling2
);
1468 if (flag_var_tracking_assignments_toggle
)
1469 flag_var_tracking_assignments
= !flag_var_tracking_assignments
;
1471 if (flag_var_tracking_assignments
&& !flag_var_tracking
)
1472 flag_var_tracking
= flag_var_tracking_assignments
= -1;
1474 if (flag_var_tracking_assignments
1475 && (flag_selective_scheduling
|| flag_selective_scheduling2
))
1476 warning (0, "var-tracking-assignments changes selective scheduling");
1478 if (flag_tree_cselim
== AUTODETECT_VALUE
)
1479 #ifdef HAVE_conditional_move
1480 flag_tree_cselim
= 1;
1482 flag_tree_cselim
= 0;
1485 /* If auxiliary info generation is desired, open the output file.
1486 This goes in the same directory as the source file--unlike
1487 all the other output files. */
1488 if (flag_gen_aux_info
)
1490 aux_info_file
= fopen (aux_info_file_name
, "w");
1491 if (aux_info_file
== 0)
1492 fatal_error ("can%'t open %s: %m", aux_info_file_name
);
1495 if (!targetm_common
.have_named_sections
)
1497 if (flag_function_sections
)
1499 warning (0, "-ffunction-sections not supported for this target");
1500 flag_function_sections
= 0;
1502 if (flag_data_sections
)
1504 warning (0, "-fdata-sections not supported for this target");
1505 flag_data_sections
= 0;
1509 #ifndef HAVE_prefetch
1510 if (flag_prefetch_loop_arrays
> 0)
1512 warning (0, "-fprefetch-loop-arrays not supported for this target");
1513 flag_prefetch_loop_arrays
= 0;
1516 if (flag_prefetch_loop_arrays
> 0 && !HAVE_prefetch
)
1518 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1519 flag_prefetch_loop_arrays
= 0;
1523 /* This combination of options isn't handled for i386 targets and doesn't
1524 make much sense anyway, so don't allow it. */
1525 if (flag_prefetch_loop_arrays
> 0 && optimize_size
)
1527 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1528 flag_prefetch_loop_arrays
= 0;
1531 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1532 if (flag_signaling_nans
)
1533 flag_trapping_math
= 1;
1535 /* We cannot reassociate if we want traps or signed zeros. */
1536 if (flag_associative_math
&& (flag_trapping_math
|| flag_signed_zeros
))
1538 warning (0, "-fassociative-math disabled; other options take precedence");
1539 flag_associative_math
= 0;
1542 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1543 if (flag_cx_limited_range
)
1544 flag_complex_method
= 0;
1546 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1547 if (flag_cx_fortran_rules
)
1548 flag_complex_method
= 1;
1550 /* Targets must be able to place spill slots at lower addresses. If the
1551 target already uses a soft frame pointer, the transition is trivial. */
1552 if (!FRAME_GROWS_DOWNWARD
&& flag_stack_protect
)
1554 warning (0, "-fstack-protector not supported for this target");
1555 flag_stack_protect
= 0;
1557 if (!flag_stack_protect
)
1558 warn_stack_protect
= 0;
1560 /* Address Sanitizer needs porting to each target architecture. */
1562 if ((flag_sanitize
& SANITIZE_ADDRESS
)
1563 && !FRAME_GROWS_DOWNWARD
)
1566 "-fsanitize=address and -fsanitize=kernel-address "
1567 "are not supported for this target");
1568 flag_sanitize
&= ~SANITIZE_ADDRESS
;
1571 if ((flag_sanitize
& SANITIZE_USER_ADDRESS
)
1572 && targetm
.asan_shadow_offset
== NULL
)
1574 warning (0, "-fsanitize=address not supported for this target");
1575 flag_sanitize
&= ~SANITIZE_ADDRESS
;
1578 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1579 have not been set. */
1580 if (!global_options_set
.x_warnings_are_errors
1581 && warn_coverage_mismatch
1582 && (global_dc
->classify_diagnostic
[OPT_Wcoverage_mismatch
] ==
1584 diagnostic_classify_diagnostic (global_dc
, OPT_Wcoverage_mismatch
,
1585 DK_ERROR
, UNKNOWN_LOCATION
);
1587 /* Save the current optimization options. */
1588 optimization_default_node
= build_optimization_node (&global_options
);
1589 optimization_current_node
= optimization_default_node
;
1592 /* This function can be called multiple times to reinitialize the compiler
1593 back end when register classes or instruction sets have changed,
1594 before each function. */
1596 backend_init_target (void)
1598 /* Initialize alignment variables. */
1601 /* This depends on stack_pointer_rtx. */
1602 init_fake_stack_mems ();
1604 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1606 init_alias_target ();
1608 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1611 /* Depends on the enabled attribute. */
1614 /* The following initialization functions need to generate rtl, so
1615 provide a dummy function context for them. */
1616 init_dummy_function_start ();
1618 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1619 on a mode change. */
1621 init_lower_subreg ();
1624 init_expr_target ();
1627 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1628 after a mode change as well. */
1629 caller_save_initialized_p
= false;
1631 expand_dummy_function_end ();
1634 /* Initialize the compiler back end. This function is called only once,
1635 when starting the compiler. */
1642 init_inline_once ();
1643 init_varasm_once ();
1644 save_register_info ();
1646 /* Middle end needs this initialization for default mem attributes
1647 used by early calls to make_decl_rtl. */
1650 /* Middle end needs this initialization for mode tables used to assign
1651 modes to vector variables. */
1655 /* Initialize excess precision settings. */
1657 init_excess_precision (void)
1659 /* Adjust excess precision handling based on the target options. If
1660 the front end cannot handle it, flag_excess_precision_cmdline
1661 will already have been set accordingly in the post_options
1663 gcc_assert (flag_excess_precision_cmdline
!= EXCESS_PRECISION_DEFAULT
);
1664 flag_excess_precision
= flag_excess_precision_cmdline
;
1665 if (flag_unsafe_math_optimizations
)
1666 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1667 if (flag_excess_precision
== EXCESS_PRECISION_STANDARD
)
1669 int flt_eval_method
= TARGET_FLT_EVAL_METHOD
;
1670 switch (flt_eval_method
)
1674 /* Either the target acts unpredictably (-1) or has all the
1675 operations required not to have excess precision (0). */
1676 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1680 /* In these cases, predictable excess precision makes
1684 /* Any other implementation-defined FLT_EVAL_METHOD values
1685 require the compiler to handle the associated excess
1686 precision rules in excess_precision_type. */
1692 /* Initialize things that are both lang-dependent and target-dependent.
1693 This function can be called more than once if target parameters change. */
1695 lang_dependent_init_target (void)
1697 /* This determines excess precision settings. */
1698 init_excess_precision ();
1700 /* This creates various _DECL nodes, so needs to be called after the
1701 front end is initialized. It also depends on the HAVE_xxx macros
1702 generated from the target machine description. */
1705 gcc_assert (!this_target_rtl
->target_specific_initialized
);
1708 /* Perform initializations that are lang-dependent or target-dependent.
1709 but matters only for late optimizations and RTL generation. */
1712 initialize_rtl (void)
1714 static int initialized_once
;
1716 /* Initialization done just once per compilation, but delayed
1717 till code generation. */
1718 if (!initialized_once
)
1720 initialized_once
= true;
1722 /* Target specific RTL backend initialization. */
1723 if (!this_target_rtl
->target_specific_initialized
)
1725 backend_init_target ();
1726 this_target_rtl
->target_specific_initialized
= true;
1730 /* Language-dependent initialization. Returns nonzero on success. */
1732 lang_dependent_init (const char *name
)
1734 location_t save_loc
= input_location
;
1735 if (dump_base_name
== 0)
1736 dump_base_name
= name
&& name
[0] ? name
: "gccdump";
1738 /* Other front-end initialization. */
1739 input_location
= BUILTINS_LOCATION
;
1740 if (lang_hooks
.init () == 0)
1742 input_location
= save_loc
;
1746 init_asm_output (name
);
1748 /* If stack usage information is desired, open the output file. */
1749 if (flag_stack_usage
)
1750 stack_usage_file
= open_auxiliary_file ("su");
1753 /* This creates various _DECL nodes, so needs to be called after the
1754 front end is initialized. */
1757 /* Do the target-specific parts of the initialization. */
1758 lang_dependent_init_target ();
1762 /* If dbx symbol table desired, initialize writing it and output the
1763 predefined types. */
1764 timevar_push (TV_SYMOUT
);
1766 /* Now we have the correct original filename, we can initialize
1768 (*debug_hooks
->init
) (name
);
1770 timevar_pop (TV_SYMOUT
);
1777 /* Reinitialize everything when target parameters, such as register usage,
1780 target_reinit (void)
1782 struct rtl_data saved_x_rtl
;
1783 rtx
*saved_regno_reg_rtx
;
1784 tree saved_optimization_current_node
;
1785 struct target_optabs
*saved_this_fn_optabs
;
1787 /* Temporarily switch to the default optimization node, so that
1788 *this_target_optabs is set to the default, not reflecting
1789 whatever a previous function used for the optimize
1791 saved_optimization_current_node
= optimization_current_node
;
1792 saved_this_fn_optabs
= this_fn_optabs
;
1793 if (saved_optimization_current_node
!= optimization_default_node
)
1795 optimization_current_node
= optimization_default_node
;
1796 cl_optimization_restore
1798 TREE_OPTIMIZATION (optimization_default_node
));
1800 this_fn_optabs
= this_target_optabs
;
1802 /* Save *crtl and regno_reg_rtx around the reinitialization
1803 to allow target_reinit being called even after prepare_function_start. */
1804 saved_regno_reg_rtx
= regno_reg_rtx
;
1805 if (saved_regno_reg_rtx
)
1807 saved_x_rtl
= *crtl
;
1808 memset (crtl
, '\0', sizeof (*crtl
));
1809 regno_reg_rtx
= NULL
;
1812 this_target_rtl
->target_specific_initialized
= false;
1814 /* This initializes hard_frame_pointer, and calls init_reg_modes_target()
1815 to initialize reg_raw_mode[]. */
1818 /* This invokes target hooks to set fixed_reg[] etc, which is
1822 /* Reinitialize lang-dependent parts. */
1823 lang_dependent_init_target ();
1825 /* Restore the original optimization node. */
1826 if (saved_optimization_current_node
!= optimization_default_node
)
1828 optimization_current_node
= saved_optimization_current_node
;
1829 cl_optimization_restore (&global_options
,
1830 TREE_OPTIMIZATION (optimization_current_node
));
1832 this_fn_optabs
= saved_this_fn_optabs
;
1834 /* Restore regno_reg_rtx at the end, as free_after_compilation from
1835 expand_dummy_function_end clears it. */
1836 if (saved_regno_reg_rtx
)
1838 *crtl
= saved_x_rtl
;
1839 regno_reg_rtx
= saved_regno_reg_rtx
;
1840 saved_regno_reg_rtx
= NULL
;
1845 dump_memory_report (bool final
)
1847 dump_line_table_statistics ();
1848 ggc_print_statistics ();
1849 stringpool_statistics ();
1850 dump_tree_statistics ();
1851 dump_gimple_statistics ();
1852 dump_rtx_statistics ();
1853 dump_alloc_pool_statistics ();
1854 dump_bitmap_statistics ();
1855 dump_vec_loc_statistics ();
1856 dump_ggc_loc_statistics (final
);
1857 dump_alias_stats (stderr
);
1858 dump_pta_stats (stderr
);
1861 /* Clean up: close opened files, etc. */
1864 finalize (bool no_backend
)
1866 /* Close the dump files. */
1867 if (flag_gen_aux_info
)
1869 fclose (aux_info_file
);
1871 unlink (aux_info_file_name
);
1874 /* Close non-debugging input and output files. Take special care to note
1875 whether fclose returns an error, since the pages might still be on the
1876 buffer chain while the file is open. */
1880 if (ferror (asm_out_file
) != 0)
1881 fatal_error ("error writing to %s: %m", asm_file_name
);
1882 if (fclose (asm_out_file
) != 0)
1883 fatal_error ("error closing %s: %m", asm_file_name
);
1886 if (stack_usage_file
)
1887 fclose (stack_usage_file
);
1893 g
->get_passes ()->finish_optimization_passes ();
1899 dump_memory_report (true);
1902 dump_profile_report ();
1904 /* Language-specific end of compilation actions. */
1905 lang_hooks
.finish ();
1909 standard_type_bitsize (int bitsize
)
1911 /* As a special exception, we always want __int128 enabled if possible. */
1914 if (bitsize
== CHAR_TYPE_SIZE
1915 || bitsize
== SHORT_TYPE_SIZE
1916 || bitsize
== INT_TYPE_SIZE
1917 || bitsize
== LONG_TYPE_SIZE
1918 || bitsize
== LONG_LONG_TYPE_SIZE
)
1923 /* Initialize the compiler, and compile the input file. */
1927 /* Initialize timing first. The C front ends read the main file in
1928 the post_options hook, and C++ does file timings. */
1929 if (time_report
|| !quiet_flag
|| flag_detailed_statistics
)
1931 timevar_start (TV_TOTAL
);
1935 /* Don't do any more if an error has already occurred. */
1940 timevar_start (TV_PHASE_SETUP
);
1942 /* This must be run always, because it is needed to compute the FP
1943 predefined macros, such as __LDBL_MAX__, for targets using non
1944 default FP formats. */
1945 init_adjust_machine_modes ();
1946 init_derived_machine_modes ();
1948 /* This must happen after the backend has a chance to process
1949 command line options, but before the parsers are
1951 for (i
= 0; i
< NUM_INT_N_ENTS
; i
++)
1952 if (targetm
.scalar_mode_supported_p (int_n_data
[i
].m
)
1953 && ! standard_type_bitsize (int_n_data
[i
].bitsize
))
1954 int_n_enabled_p
[i
] = true;
1956 int_n_enabled_p
[i
] = false;
1958 /* Set up the back-end if requested. */
1962 /* Language-dependent initialization. Returns true on success. */
1963 if (lang_dependent_init (main_input_filename
))
1965 /* Initialize yet another pass. */
1967 ggc_protect_identifiers
= true;
1969 symtab
->initialize ();
1970 init_final (main_input_filename
);
1971 coverage_init (aux_base_name
);
1973 invoke_plugin_callbacks (PLUGIN_START_UNIT
, NULL
);
1975 timevar_stop (TV_PHASE_SETUP
);
1981 timevar_stop (TV_PHASE_SETUP
);
1984 timevar_start (TV_PHASE_FINALIZE
);
1986 finalize (no_backend
);
1988 timevar_stop (TV_PHASE_FINALIZE
);
1991 /* Stop timing and print the times. */
1992 timevar_stop (TV_TOTAL
);
1993 timevar_print (stderr
);
1996 /* Entry point of cc1, cc1plus, jc1, f771, etc.
1997 Exit code is FATAL_EXIT_CODE if can't open files or if there were
1998 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2000 It is not safe to call this function more than once. */
2003 toplev_main (int argc
, char **argv
)
2005 /* Parsing and gimplification sometimes need quite large stack.
2006 Increase stack size limits if possible. */
2007 stack_limit_increase (64 * 1024 * 1024);
2009 expandargv (&argc
, &argv
);
2011 /* Initialization of GCC's environment, and diagnostics. */
2012 general_init (argv
[0]);
2014 /* One-off initialization of options that does not need to be
2015 repeated when options are added for particular functions. */
2016 init_options_once ();
2018 /* Initialize global options structures; this must be repeated for
2019 each structure used for parsing options. */
2020 init_options_struct (&global_options
, &global_options_set
);
2021 lang_hooks
.init_options_struct (&global_options
);
2023 /* Convert the options to an array. */
2024 decode_cmdline_options_to_array_default_mask (argc
,
2025 CONST_CAST2 (const char **,
2027 &save_decoded_options
,
2028 &save_decoded_options_count
);
2030 /* Perform language-specific options initialization. */
2031 lang_hooks
.init_options (save_decoded_options_count
, save_decoded_options
);
2033 /* Parse the options and do minimal processing; basically just
2034 enough to default flags appropriately. */
2035 decode_options (&global_options
, &global_options_set
,
2036 save_decoded_options
, save_decoded_options_count
,
2037 UNKNOWN_LOCATION
, global_dc
);
2039 handle_common_deferred_options ();
2043 initialize_plugins ();
2046 print_version (stderr
, "");
2049 print_plugins_help (stderr
, "");
2051 /* Exit early if we can (e.g. -help). */
2052 if (!exit_after_options
)
2055 if (warningcount
|| errorcount
|| werrorcount
)
2056 print_ignored_options ();
2058 /* Invoke registered plugin callbacks if any. Some plugins could
2059 emit some diagnostics here. */
2060 invoke_plugin_callbacks (PLUGIN_FINISH
, NULL
);
2062 diagnostic_finish (global_dc
);
2064 finalize_plugins ();
2065 location_adhoc_data_fini (line_table
);
2066 if (seen_error () || werrorcount
)
2067 return (FATAL_EXIT_CODE
);
2069 return (SUCCESS_EXIT_CODE
);