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"
52 #include "diagnostic.h"
53 #include "tree-diagnostic.h"
54 #include "tree-pretty-print.h"
58 #include "dwarf2asm.h"
61 #include "common/common-target.h"
62 #include "langhooks.h"
63 #include "cfgloop.h" /* for init_set_costs */
64 #include "hosthooks.h"
67 #include "opts-diagnostic.h"
69 #include "value-prof.h"
70 #include "alloc-pool.h"
73 #include "tree-ssa-alias.h"
74 #include "internal-fn.h"
75 #include "gimple-expr.h"
78 #include "diagnostic-color.h"
80 #include "pass_manager.h"
83 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
87 #ifdef SDB_DEBUGGING_INFO
91 #ifdef XCOFF_DEBUGGING_INFO
92 #include "xcoffout.h" /* Needed for external data
93 declarations for e.g. AIX 4.x. */
98 static void general_init (const char *);
99 static void do_compile (void);
100 static void process_options (void);
101 static void backend_init (void);
102 static int lang_dependent_init (const char *);
103 static void init_asm_output (const char *);
104 static void finalize (bool);
106 static void crash_signal (int) ATTRIBUTE_NORETURN
;
107 static void compile_file (void);
109 /* True if we don't need a backend (e.g. preprocessing only). */
110 static bool no_backend
;
112 /* Length of line when printing switch values. */
115 /* Decoded options, and number of such options. */
116 struct cl_decoded_option
*save_decoded_options
;
117 unsigned int save_decoded_options_count
;
119 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
120 to optimize in process_options (). */
121 #define AUTODETECT_VALUE 2
123 /* Debug hooks - dependent upon command line options. */
125 const struct gcc_debug_hooks
*debug_hooks
;
127 /* The FUNCTION_DECL for the function currently being compiled,
128 or 0 if between functions. */
129 tree current_function_decl
;
131 /* Set to the FUNC_BEGIN label of the current function, or NULL
133 const char * current_function_func_begin_label
;
135 /* A random sequence of characters, unless overridden by user. */
136 static const char *flag_random_seed
;
138 /* A local time stamp derived from the time of compilation. It will be
139 zero if the system cannot provide a time. It will be -1u, if the
140 user has specified a particular random seed. */
143 /* Random number for this compilation */
144 HOST_WIDE_INT random_seed
;
148 /* When non-NULL, indicates that whenever space is allocated on the
149 stack, the resulting stack pointer must not pass this
150 address---that is, for stacks that grow downward, the stack pointer
151 must always be greater than or equal to this address; for stacks
152 that grow upward, the stack pointer must be less than this address.
153 At present, the rtx may be either a REG or a SYMBOL_REF, although
154 the support provided depends on the backend. */
157 /* True if the user has tagged the function with the 'section'
160 bool user_defined_section_attribute
= false;
162 struct target_flag_state default_target_flag_state
;
163 #if SWITCHABLE_TARGET
164 struct target_flag_state
*this_target_flag_state
= &default_target_flag_state
;
166 #define this_target_flag_state (&default_target_flag_state)
169 /* The user symbol prefix after having resolved same. */
170 const char *user_label_prefix
;
172 /* Output files for assembler code (real compiler output)
173 and debugging dumps. */
177 FILE *stack_usage_file
= NULL
;
179 /* The current working directory of a translation. It's generally the
180 directory from which compilation was initiated, but a preprocessed
181 file may specify the original directory in which it was
184 static const char *src_pwd
;
186 /* Initialize src_pwd with the given string, and return true. If it
187 was already initialized, return false. As a special case, it may
188 be called with a NULL argument to test whether src_pwd has NOT been
192 set_src_pwd (const char *pwd
)
196 if (strcmp (src_pwd
, pwd
) == 0)
202 src_pwd
= xstrdup (pwd
);
206 /* Return the directory from which the translation unit was initiated,
207 in case set_src_pwd() was not called before to assign it a
223 /* Called when the start of a function definition is parsed,
224 this function prints on stderr the name of the function. */
226 announce_function (tree decl
)
230 if (rtl_dump_and_exit
)
231 fprintf (stderr
, "%s ",
232 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl
))));
234 fprintf (stderr
, " %s",
235 identifier_to_locale (lang_hooks
.decl_printable_name (decl
, 2)));
237 pp_needs_newline (global_dc
->printer
) = true;
238 diagnostic_set_last_function (global_dc
, (diagnostic_info
*) NULL
);
242 /* Initialize local_tick with a random number or -1 if
243 flag_random_seed is set. */
246 init_local_tick (void)
248 if (!flag_random_seed
)
250 /* Try urandom first. Time of day is too likely to collide.
251 In case of any error we just use the local tick. */
253 int fd
= open ("/dev/urandom", O_RDONLY
);
256 read (fd
, &random_seed
, sizeof (random_seed
));
260 /* Now get the tick anyways */
261 #ifdef HAVE_GETTIMEOFDAY
265 gettimeofday (&tv
, NULL
);
266 local_tick
= (unsigned) tv
.tv_sec
* 1000 + tv
.tv_usec
/ 1000;
270 time_t now
= time (NULL
);
272 if (now
!= (time_t)-1)
273 local_tick
= (unsigned) now
;
281 /* Set up a default flag_random_seed and local_tick, unless the user
282 already specified one. Must be called after init_local_tick. */
285 init_random_seed (void)
288 random_seed
= local_tick
^ getpid (); /* Old racey fallback method */
291 /* Obtain the random_seed. Unless NOINIT, initialize it if
292 it's not provided in the command line. */
295 get_random_seed (bool noinit
)
297 if (!flag_random_seed
&& !noinit
)
302 /* Modify the random_seed string to VAL. Return its previous
306 set_random_seed (const char *val
)
308 const char *old
= flag_random_seed
;
309 flag_random_seed
= val
;
310 if (flag_random_seed
)
314 /* When the driver passed in a hex number don't crc it again */
315 random_seed
= strtoul (flag_random_seed
, &endp
, 0);
316 if (!(endp
> flag_random_seed
&& *endp
== 0))
317 random_seed
= crc32_string (0, flag_random_seed
);
322 /* Handler for fatal signals, such as SIGSEGV. These are transformed
323 into ICE messages, which is much more user friendly. In case the
324 error printer crashes, reset the signal to prevent infinite recursion. */
327 crash_signal (int signo
)
329 signal (signo
, SIG_DFL
);
331 /* If we crashed while processing an ASM statement, then be a little more
332 graceful. It's most likely the user's fault. */
333 if (this_is_asm_operands
)
335 output_operand_lossage ("unrecoverable error");
336 exit (FATAL_EXIT_CODE
);
339 internal_error ("%s", strsignal (signo
));
342 /* A subroutine of wrapup_global_declarations. We've come to the end of
343 the compilation unit. All deferred variables should be undeferred,
344 and all incomplete decls should be finalized. */
347 wrapup_global_declaration_1 (tree decl
)
349 /* We're not deferring this any longer. Assignment is conditional to
350 avoid needlessly dirtying PCH pages. */
351 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl
), TS_DECL_WITH_VIS
)
352 && DECL_DEFER_OUTPUT (decl
) != 0)
353 DECL_DEFER_OUTPUT (decl
) = 0;
355 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0)
356 lang_hooks
.finish_incomplete_decl (decl
);
359 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
360 needs to be output. Return true if it is output. */
363 wrapup_global_declaration_2 (tree decl
)
365 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
)
366 || (TREE_CODE (decl
) == VAR_DECL
&& DECL_HAS_VALUE_EXPR_P (decl
)))
369 /* Don't write out static consts, unless we still need them.
371 We also keep static consts if not optimizing (for debugging),
372 unless the user specified -fno-keep-static-consts.
373 ??? They might be better written into the debug information.
374 This is possible when using DWARF.
376 A language processor that wants static constants to be always
377 written out (even if it is not used) is responsible for
378 calling rest_of_decl_compilation itself. E.g. the C front-end
379 calls rest_of_decl_compilation from finish_decl.
380 One motivation for this is that is conventional in some
381 environments to write things like:
382 static const char rcsid[] = "... version string ...";
383 intending to force the string to be in the executable.
385 A language processor that would prefer to have unneeded
386 static constants "optimized away" would just defer writing
387 them out until here. E.g. C++ does this, because static
388 constants are often defined in header files.
390 ??? A tempting alternative (for both C and C++) would be
391 to force a constant to be written if and only if it is
392 defined in a main file, as opposed to an include file. */
394 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
398 node
= varpool_node::get (decl
);
400 if (!node
&& flag_ltrans
)
402 else if (node
&& node
->definition
)
404 else if (node
&& node
->alias
)
406 else if (!symtab
->global_info_ready
408 || TREE_USED (DECL_ASSEMBLER_NAME (decl
))))
410 else if (node
&& node
->analyzed
)
412 else if (DECL_COMDAT (decl
))
414 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
415 && (optimize
|| !flag_keep_static_consts
416 || DECL_ARTIFICIAL (decl
)))
421 rest_of_decl_compilation (decl
, 1, 1);
429 /* Do any final processing required for the declarations in VEC, of
430 which there are LEN. We write out inline functions and variables
431 that have been deferred until this point, but which are required.
432 Returns nonzero if anything was put out. */
435 wrapup_global_declarations (tree
*vec
, int len
)
437 bool reconsider
, output_something
= false;
440 for (i
= 0; i
< len
; i
++)
441 wrapup_global_declaration_1 (vec
[i
]);
443 /* Now emit any global variables or functions that we have been
444 putting off. We need to loop in case one of the things emitted
445 here references another one which comes earlier in the list. */
449 for (i
= 0; i
< len
; i
++)
450 reconsider
|= wrapup_global_declaration_2 (vec
[i
]);
452 output_something
= true;
456 return output_something
;
459 /* A subroutine of check_global_declarations. Issue appropriate warnings
460 for the global declaration DECL. */
463 check_global_declaration_1 (tree decl
)
465 /* Warn about any function declared static but not defined. We don't
466 warn about variables, because many programs have static variables
467 that exist only to get some text into the object file. */
468 if (TREE_CODE (decl
) == FUNCTION_DECL
469 && DECL_INITIAL (decl
) == 0
470 && DECL_EXTERNAL (decl
)
471 && ! DECL_ARTIFICIAL (decl
)
472 && ! TREE_NO_WARNING (decl
)
473 && ! TREE_PUBLIC (decl
)
474 && (warn_unused_function
475 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
477 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
478 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
480 warning (OPT_Wunused_function
, "%q+F declared %<static%> but never defined", decl
);
481 /* This symbol is effectively an "extern" declaration now. */
482 TREE_PUBLIC (decl
) = 1;
485 /* Warn about static fns or vars defined but not used. */
486 if (((warn_unused_function
&& TREE_CODE (decl
) == FUNCTION_DECL
)
487 /* We don't warn about "static const" variables because the
488 "rcs_id" idiom uses that construction. */
489 || (warn_unused_variable
490 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
491 && ! DECL_IN_SYSTEM_HEADER (decl
)
492 && ! TREE_USED (decl
)
493 /* The TREE_USED bit for file-scope decls is kept in the identifier,
494 to handle multiple external decls in different scopes. */
495 && ! (DECL_NAME (decl
) && TREE_USED (DECL_NAME (decl
)))
496 && ! DECL_EXTERNAL (decl
)
497 && ! TREE_PUBLIC (decl
)
498 /* A volatile variable might be used in some non-obvious way. */
499 && ! TREE_THIS_VOLATILE (decl
)
500 /* Global register variables must be declared to reserve them. */
501 && ! (TREE_CODE (decl
) == VAR_DECL
&& DECL_REGISTER (decl
))
502 /* Otherwise, ask the language. */
503 && lang_hooks
.decls
.warn_unused_global (decl
))
504 warning ((TREE_CODE (decl
) == FUNCTION_DECL
)
505 ? OPT_Wunused_function
506 : OPT_Wunused_variable
,
507 "%q+D defined but not used", decl
);
510 /* Issue appropriate warnings for the global declarations in V (of
511 which there are LEN). */
514 check_global_declarations (tree
*v
, int len
)
518 for (i
= 0; i
< len
; i
++)
519 check_global_declaration_1 (v
[i
]);
522 /* Emit debugging information for all global declarations in VEC. */
525 emit_debug_global_declarations (tree
*vec
, int len
)
529 /* Avoid confusing the debug information machinery when there are errors. */
533 timevar_push (TV_SYMOUT
);
534 for (i
= 0; i
< len
; i
++)
535 debug_hooks
->global_decl (vec
[i
]);
536 timevar_pop (TV_SYMOUT
);
539 /* Compile an entire translation unit. Write a file of assembly
540 output and various debugging dumps. */
545 timevar_start (TV_PHASE_PARSING
);
546 timevar_push (TV_PARSE_GLOBAL
);
548 /* Call the parser, which parses the entire file (calling
549 rest_of_compilation for each function). */
550 lang_hooks
.parse_file ();
552 timevar_pop (TV_PARSE_GLOBAL
);
553 timevar_stop (TV_PHASE_PARSING
);
555 /* Compilation is now finished except for writing
556 what's left of the symbol table output. */
558 if (flag_syntax_only
|| flag_wpa
)
561 ggc_protect_identifiers
= false;
563 /* This must also call finalize_compilation_unit. */
564 lang_hooks
.decls
.final_write_globals ();
569 timevar_start (TV_PHASE_LATE_ASM
);
571 /* Compilation unit is finalized. When producing non-fat LTO object, we are
572 basically finished. */
573 if (in_lto_p
|| !flag_lto
|| flag_fat_lto_objects
)
575 /* File-scope initialization for AddressSanitizer. */
576 if (flag_sanitize
& SANITIZE_ADDRESS
)
579 if (flag_sanitize
& SANITIZE_THREAD
)
582 output_shared_constant_pool ();
583 output_object_blocks ();
584 finish_tm_clone_pairs ();
586 /* Write out any pending weak symbol declarations. */
589 /* This must be at the end before unwind and debug info.
590 Some target ports emit PIC setup thunks here. */
591 targetm
.asm_out
.code_end ();
593 /* Do dbx symbols. */
594 timevar_push (TV_SYMOUT
);
596 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
597 if (dwarf2out_do_frame ())
598 dwarf2out_frame_finish ();
601 (*debug_hooks
->finish
) (main_input_filename
);
602 timevar_pop (TV_SYMOUT
);
604 /* Output some stuff at end of file if nec. */
606 dw2_output_indirect_constants ();
608 /* Flush any pending external directives. */
609 process_pending_assemble_externals ();
612 /* Emit LTO marker if LTO info has been previously emitted. This is
613 used by collect2 to determine whether an object file contains IL.
614 We used to emit an undefined reference here, but this produces
615 link errors if an object file with IL is stored into a shared
616 library without invoking lto1. */
617 if (flag_generate_lto
)
619 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
620 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
,
622 (unsigned HOST_WIDE_INT
) 1, 8);
623 #elif defined ASM_OUTPUT_ALIGNED_COMMON
624 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_v1",
625 (unsigned HOST_WIDE_INT
) 1, 8);
627 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_v1",
628 (unsigned HOST_WIDE_INT
) 1,
629 (unsigned HOST_WIDE_INT
) 1);
631 /* Let linker plugin know that this is a slim object and must be LTOed
632 even when user did not ask for it. */
633 if (!flag_fat_lto_objects
)
635 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
636 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, NULL_TREE
,
638 (unsigned HOST_WIDE_INT
) 1, 8);
639 #elif defined ASM_OUTPUT_ALIGNED_COMMON
640 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, "__gnu_lto_slim",
641 (unsigned HOST_WIDE_INT
) 1, 8);
643 ASM_OUTPUT_COMMON (asm_out_file
, "__gnu_lto_slim",
644 (unsigned HOST_WIDE_INT
) 1,
645 (unsigned HOST_WIDE_INT
) 1);
650 /* Attach a special .ident directive to the end of the file to identify
651 the version of GCC which compiled this code. The format of the .ident
652 string is patterned after the ones produced by native SVR4 compilers. */
655 const char *pkg_version
= "(GNU) ";
658 if (strcmp ("(GCC) ", pkgversion_string
))
659 pkg_version
= pkgversion_string
;
661 ident_str
= ACONCAT (("GCC: ", pkg_version
, version_string
, NULL
));
662 targetm
.asm_out
.output_ident (ident_str
);
665 /* Invoke registered plugin callbacks. */
666 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT
, NULL
);
668 /* This must be at the end. Some target ports emit end of file directives
669 into the assembly file here, and hence we can not output anything to the
670 assembly file after this point. */
671 targetm
.asm_out
.file_end ();
673 timevar_stop (TV_PHASE_LATE_ASM
);
676 /* Print version information to FILE.
677 Each line begins with INDENT (for the case where FILE is the
678 assembler output file). */
681 print_version (FILE *file
, const char *indent
)
683 static const char fmt1
[] =
685 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
687 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
690 static const char fmt2
[] =
691 N_("GMP version %s, MPFR version %s, MPC version %s\n");
692 static const char fmt3
[] =
693 N_("%s%swarning: %s header version %s differs from library version %s.\n");
694 static const char fmt4
[] =
695 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
697 #define __VERSION__ "[?]"
700 file
== stderr
? _(fmt1
) : fmt1
,
701 indent
, *indent
!= 0 ? " " : "",
702 lang_hooks
.name
, pkgversion_string
, version_string
, TARGET_NAME
,
703 indent
, __VERSION__
);
705 /* We need to stringify the GMP macro values. Ugh, gmp_version has
706 two string formats, "i.j.k" and "i.j" when k is zero. As of
707 gmp-4.3.0, GMP always uses the 3 number format. */
708 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
709 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3 (X)
710 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
711 #define GCC_GMP_VERSION \
712 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
713 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
714 #define GCC_GMP_STRINGIFY_VERSION \
715 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
716 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR)
718 #define GCC_GMP_STRINGIFY_VERSION \
719 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
720 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR) "." \
721 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_PATCHLEVEL)
724 file
== stderr
? _(fmt2
) : fmt2
,
725 GCC_GMP_STRINGIFY_VERSION
, MPFR_VERSION_STRING
, MPC_VERSION_STRING
);
726 if (strcmp (GCC_GMP_STRINGIFY_VERSION
, gmp_version
))
728 file
== stderr
? _(fmt3
) : fmt3
,
729 indent
, *indent
!= 0 ? " " : "",
730 "GMP", GCC_GMP_STRINGIFY_VERSION
, gmp_version
);
731 if (strcmp (MPFR_VERSION_STRING
, mpfr_get_version ()))
733 file
== stderr
? _(fmt3
) : fmt3
,
734 indent
, *indent
!= 0 ? " " : "",
735 "MPFR", MPFR_VERSION_STRING
, mpfr_get_version ());
736 if (strcmp (MPC_VERSION_STRING
, mpc_get_version ()))
738 file
== stderr
? _(fmt3
) : fmt3
,
739 indent
, *indent
!= 0 ? " " : "",
740 "MPC", MPC_VERSION_STRING
, mpc_get_version ());
742 file
== stderr
? _(fmt4
) : fmt4
,
743 indent
, *indent
!= 0 ? " " : "",
744 PARAM_VALUE (GGC_MIN_EXPAND
), PARAM_VALUE (GGC_MIN_HEAPSIZE
));
746 print_plugins_versions (file
, indent
);
750 print_to_asm_out_file (print_switch_type type
, const char * text
)
752 bool prepend_sep
= true;
756 case SWITCH_TYPE_LINE_END
:
757 putc ('\n', asm_out_file
);
760 case SWITCH_TYPE_LINE_START
:
761 fputs (ASM_COMMENT_START
, asm_out_file
);
762 return strlen (ASM_COMMENT_START
);
764 case SWITCH_TYPE_DESCRIPTIVE
:
765 if (ASM_COMMENT_START
[0] == 0)
768 case SWITCH_TYPE_PASSED
:
769 case SWITCH_TYPE_ENABLED
:
771 fputc (' ', asm_out_file
);
772 fputs (text
, asm_out_file
);
773 /* No need to return the length here as
774 print_single_switch has already done it. */
783 print_to_stderr (print_switch_type type
, const char * text
)
787 case SWITCH_TYPE_LINE_END
:
791 case SWITCH_TYPE_LINE_START
:
794 case SWITCH_TYPE_PASSED
:
795 case SWITCH_TYPE_ENABLED
:
799 case SWITCH_TYPE_DESCRIPTIVE
:
800 fputs (text
, stderr
);
801 /* No need to return the length here as
802 print_single_switch has already done it. */
810 /* Print an option value and return the adjusted position in the line.
811 ??? print_fn doesn't handle errors, eg disk full; presumably other
812 code will catch a disk full though. */
815 print_single_switch (print_switch_fn_type print_fn
,
817 print_switch_type type
,
820 /* The ultrix fprintf returns 0 on success, so compute the result
821 we want here since we need it for the following test. The +1
822 is for the separator character that will probably be emitted. */
823 int len
= strlen (text
) + 1;
826 && pos
+ len
> MAX_LINE
)
828 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
833 pos
+= print_fn (SWITCH_TYPE_LINE_START
, NULL
);
835 print_fn (type
, text
);
839 /* Print active target switches using PRINT_FN.
840 POS is the current cursor position and MAX is the size of a "line".
841 Each line begins with INDENT and ends with TERM.
842 Each switch is separated from the next by SEP. */
845 print_switch_values (print_switch_fn_type print_fn
)
850 /* Fill in the -frandom-seed option, if the user didn't pass it, so
851 that it can be printed below. This helps reproducibility. */
852 if (!flag_random_seed
)
855 /* Print the options as passed. */
856 pos
= print_single_switch (print_fn
, pos
,
857 SWITCH_TYPE_DESCRIPTIVE
, _("options passed: "));
859 for (j
= 1; j
< save_decoded_options_count
; j
++)
861 switch (save_decoded_options
[j
].opt_index
)
874 pos
= print_single_switch (print_fn
, pos
, SWITCH_TYPE_PASSED
,
875 save_decoded_options
[j
].orig_option_with_args_text
);
879 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
881 /* Print the -f and -m options that have been enabled.
882 We don't handle language specific options but printing argv
884 pos
= print_single_switch (print_fn
, 0,
885 SWITCH_TYPE_DESCRIPTIVE
, _("options enabled: "));
887 for (j
= 0; j
< cl_options_count
; j
++)
888 if (cl_options
[j
].cl_report
889 && option_enabled (j
, &global_options
) > 0)
890 pos
= print_single_switch (print_fn
, pos
,
891 SWITCH_TYPE_ENABLED
, cl_options
[j
].opt_text
);
893 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
896 /* Open assembly code output file. Do this even if -fsyntax-only is
897 on, because then the driver will have provided the name of a
898 temporary file or bit bucket for us. NAME is the file specified on
899 the command line, possibly NULL. */
901 init_asm_output (const char *name
)
903 if (name
== NULL
&& asm_file_name
== 0)
904 asm_out_file
= stdout
;
907 if (asm_file_name
== 0)
909 int len
= strlen (dump_base_name
);
910 char *dumpname
= XNEWVEC (char, len
+ 6);
912 memcpy (dumpname
, dump_base_name
, len
+ 1);
913 strip_off_ending (dumpname
, len
);
914 strcat (dumpname
, ".s");
915 asm_file_name
= dumpname
;
917 if (!strcmp (asm_file_name
, "-"))
918 asm_out_file
= stdout
;
920 asm_out_file
= fopen (asm_file_name
, "w");
921 if (asm_out_file
== 0)
922 fatal_error ("can%'t open %s for writing: %m", asm_file_name
);
925 if (!flag_syntax_only
)
927 targetm
.asm_out
.file_start ();
929 if (flag_record_gcc_switches
)
931 if (targetm
.asm_out
.record_gcc_switches
)
933 /* Let the target know that we are about to start recording. */
934 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
936 /* Now record the switches. */
937 print_switch_values (targetm
.asm_out
.record_gcc_switches
);
938 /* Let the target know that the recording is over. */
939 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
943 inform (input_location
, "-frecord-gcc-switches is not supported by the current target");
946 if (flag_verbose_asm
)
948 /* Print the list of switches in effect
949 into the assembler file as comments. */
950 print_version (asm_out_file
, ASM_COMMENT_START
);
951 print_switch_values (print_to_asm_out_file
);
952 putc ('\n', asm_out_file
);
957 /* A helper function; used as the reallocator function for cpp's line
960 realloc_for_line_map (void *ptr
, size_t len
)
962 return ggc_realloc (ptr
, len
);
965 /* A helper function: used as the allocator function for
966 identifier_to_locale. */
968 alloc_for_identifier_to_locale (size_t len
)
970 return ggc_alloc_atomic (len
);
973 /* Output stack usage information. */
975 output_stack_usage (void)
977 static bool warning_issued
= false;
978 enum stack_usage_kind_type
{ STATIC
= 0, DYNAMIC
, DYNAMIC_BOUNDED
};
979 const char *stack_usage_kind_str
[] = {
984 HOST_WIDE_INT stack_usage
= current_function_static_stack_size
;
985 enum stack_usage_kind_type stack_usage_kind
;
991 warning (0, "stack usage computation not supported for this target");
992 warning_issued
= true;
997 stack_usage_kind
= STATIC
;
999 /* Add the maximum amount of space pushed onto the stack. */
1000 if (current_function_pushed_stack_size
> 0)
1002 stack_usage
+= current_function_pushed_stack_size
;
1003 stack_usage_kind
= DYNAMIC_BOUNDED
;
1006 /* Now on to the tricky part: dynamic stack allocation. */
1007 if (current_function_allocates_dynamic_stack_space
)
1009 if (current_function_has_unbounded_dynamic_stack_size
)
1010 stack_usage_kind
= DYNAMIC
;
1012 stack_usage_kind
= DYNAMIC_BOUNDED
;
1014 /* Add the size even in the unbounded case, this can't hurt. */
1015 stack_usage
+= current_function_dynamic_stack_size
;
1018 if (flag_stack_usage
)
1020 expanded_location loc
1021 = expand_location (DECL_SOURCE_LOCATION (current_function_decl
));
1022 /* We don't want to print the full qualified name because it can be long,
1023 so we strip the scope prefix, but we may need to deal with the suffix
1024 created by the compiler. */
1026 = strchr (IDENTIFIER_POINTER (DECL_NAME (current_function_decl
)), '.');
1028 = lang_hooks
.decl_printable_name (current_function_decl
, 2);
1031 const char *dot
= strchr (name
, '.');
1032 while (dot
&& strcasecmp (dot
, suffix
) != 0)
1035 dot
= strchr (name
, '.');
1040 const char *dot
= strrchr (name
, '.');
1045 fprintf (stack_usage_file
,
1046 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC
"\t%s\n",
1047 lbasename (loc
.file
),
1052 stack_usage_kind_str
[stack_usage_kind
]);
1055 if (warn_stack_usage
>= 0)
1057 const location_t loc
= DECL_SOURCE_LOCATION (current_function_decl
);
1059 if (stack_usage_kind
== DYNAMIC
)
1060 warning_at (loc
, OPT_Wstack_usage_
, "stack usage might be unbounded");
1061 else if (stack_usage
> warn_stack_usage
)
1063 if (stack_usage_kind
== DYNAMIC_BOUNDED
)
1065 OPT_Wstack_usage_
, "stack usage might be %wd bytes",
1068 warning_at (loc
, OPT_Wstack_usage_
, "stack usage is %wd bytes",
1074 /* Open an auxiliary output file. */
1076 open_auxiliary_file (const char *ext
)
1081 filename
= concat (aux_base_name
, ".", ext
, NULL
);
1082 file
= fopen (filename
, "w");
1084 fatal_error ("can%'t open %s for writing: %m", filename
);
1089 /* Initialization of the front end environment, before command line
1090 options are parsed. Signal handlers, internationalization etc.
1091 ARGV0 is main's argv[0]. */
1093 general_init (const char *argv0
)
1097 p
= argv0
+ strlen (argv0
);
1098 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
1102 xmalloc_set_program_name (progname
);
1106 /* Unlock the stdio streams. */
1107 unlock_std_streams ();
1109 gcc_init_libintl ();
1111 identifier_to_locale_alloc
= alloc_for_identifier_to_locale
;
1112 identifier_to_locale_free
= ggc_free
;
1114 /* Initialize the diagnostics reporting machinery, so option parsing
1115 can give warnings and errors. */
1116 diagnostic_initialize (global_dc
, N_OPTS
);
1117 /* Set a default printer. Language specific initializations will
1118 override it later. */
1119 tree_diagnostics_defaults (global_dc
);
1121 global_dc
->show_caret
1122 = global_options_init
.x_flag_diagnostics_show_caret
;
1123 global_dc
->show_option_requested
1124 = global_options_init
.x_flag_diagnostics_show_option
;
1125 global_dc
->show_column
1126 = global_options_init
.x_flag_show_column
;
1127 global_dc
->internal_error
= plugins_internal_error_function
;
1128 global_dc
->option_enabled
= option_enabled
;
1129 global_dc
->option_state
= &global_options
;
1130 global_dc
->option_name
= option_name
;
1132 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1134 signal (SIGSEGV
, crash_signal
);
1137 signal (SIGILL
, crash_signal
);
1140 signal (SIGBUS
, crash_signal
);
1143 signal (SIGABRT
, crash_signal
);
1145 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1146 signal (SIGIOT
, crash_signal
);
1149 signal (SIGFPE
, crash_signal
);
1152 /* Other host-specific signal setup. */
1153 (*host_hooks
.extra_signals
)();
1155 /* Initialize the garbage-collector, string pools and tree type hash
1159 line_table
= ggc_alloc
<line_maps
> ();
1160 linemap_init (line_table
, BUILTINS_LOCATION
);
1161 line_table
->reallocator
= realloc_for_line_map
;
1162 line_table
->round_alloc_size
= ggc_round_alloc_size
;
1165 /* Initialize register usage now so switches may override. */
1168 /* Register the language-independent parameters. */
1169 global_init_params ();
1171 /* This must be done after global_init_params but before argument
1173 init_ggc_heuristics ();
1175 /* Create the singleton holder for global state.
1176 Doing so also creates the pass manager and with it the passes. */
1177 g
= new gcc::context ();
1178 symtab
= ggc_cleared_alloc
<symbol_table
> ();
1180 statistics_early_init ();
1184 /* Return true if the current target supports -fsection-anchors. */
1187 target_supports_section_anchors_p (void)
1189 if (targetm
.min_anchor_offset
== 0 && targetm
.max_anchor_offset
== 0)
1192 if (targetm
.asm_out
.output_anchor
== NULL
)
1198 /* Default the align_* variables to 1 if they're still unset, and
1199 set up the align_*_log variables. */
1201 init_alignments (void)
1203 if (align_loops
<= 0)
1205 if (align_loops_max_skip
> align_loops
)
1206 align_loops_max_skip
= align_loops
- 1;
1207 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
1208 if (align_jumps
<= 0)
1210 if (align_jumps_max_skip
> align_jumps
)
1211 align_jumps_max_skip
= align_jumps
- 1;
1212 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
1213 if (align_labels
<= 0)
1215 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
1216 if (align_labels_max_skip
> align_labels
)
1217 align_labels_max_skip
= align_labels
- 1;
1218 if (align_functions
<= 0)
1219 align_functions
= 1;
1220 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
1223 /* Process the options that have been parsed. */
1225 process_options (void)
1227 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1228 This can happen with incorrect pre-processed input. */
1229 debug_hooks
= &do_nothing_debug_hooks
;
1231 maximum_field_alignment
= initial_max_fld_align
* BITS_PER_UNIT
;
1233 /* Default to -fdiagnostics-color=auto if GCC_COLORS is in the environment,
1234 otherwise default to -fdiagnostics-color=never. */
1235 if (!global_options_set
.x_flag_diagnostics_show_color
1236 && getenv ("GCC_COLORS"))
1237 pp_show_color (global_dc
->printer
)
1238 = colorize_init (DIAGNOSTICS_COLOR_AUTO
);
1240 /* Allow the front end to perform consistency checks and do further
1241 initialization based on the command line options. This hook also
1242 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1243 so we can correctly initialize debug output. */
1244 no_backend
= lang_hooks
.post_options (&main_input_filename
);
1246 /* Some machines may reject certain combinations of options. */
1247 targetm
.target_option
.override ();
1249 /* Avoid any informative notes in the second run of -fcompare-debug. */
1250 if (flag_compare_debug
)
1251 diagnostic_inhibit_notes (global_dc
);
1253 if (flag_section_anchors
&& !target_supports_section_anchors_p ())
1255 warning (OPT_fsection_anchors
,
1256 "this target does not support %qs", "-fsection-anchors");
1257 flag_section_anchors
= 0;
1260 if (flag_short_enums
== 2)
1261 flag_short_enums
= targetm
.default_short_enums ();
1263 /* Set aux_base_name if not already set. */
1266 else if (main_input_filename
)
1268 char *name
= xstrdup (lbasename (main_input_filename
));
1270 strip_off_ending (name
, strlen (name
));
1271 aux_base_name
= name
;
1274 aux_base_name
= "gccaux";
1278 || flag_graphite_identity
1280 || flag_loop_interchange
1281 || flag_loop_strip_mine
1282 || flag_loop_parallelize_all
)
1283 sorry ("Graphite loop optimizations cannot be used (ISL is not available)"
1284 "(-fgraphite, -fgraphite-identity, -floop-block, "
1285 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1286 "and -ftree-loop-linear)");
1289 /* One region RA really helps to decrease the code size. */
1290 if (flag_ira_region
== IRA_REGION_AUTODETECT
)
1292 = optimize_size
|| !optimize
? IRA_REGION_ONE
: IRA_REGION_MIXED
;
1294 if (!abi_version_at_least (2))
1296 /* -fabi-version=1 support was removed after GCC 4.9. */
1297 error ("%<-fabi-version=1%> is no longer supported");
1298 flag_abi_version
= 2;
1301 /* Unrolling all loops implies that standard loop unrolling must also
1303 if (flag_unroll_all_loops
)
1304 flag_unroll_loops
= 1;
1306 /* web and rename-registers help when run after loop unrolling. */
1307 if (flag_web
== AUTODETECT_VALUE
)
1308 flag_web
= flag_unroll_loops
|| flag_peel_loops
;
1310 if (flag_rename_registers
== AUTODETECT_VALUE
)
1311 flag_rename_registers
= flag_unroll_loops
|| flag_peel_loops
;
1313 if (flag_non_call_exceptions
)
1314 flag_asynchronous_unwind_tables
= 1;
1315 if (flag_asynchronous_unwind_tables
)
1316 flag_unwind_tables
= 1;
1318 if (flag_value_profile_transformations
)
1319 flag_profile_values
= 1;
1321 /* Warn about options that are not supported on this machine. */
1322 #ifndef INSN_SCHEDULING
1323 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
1324 warning (0, "instruction scheduling not supported on this target machine");
1327 if (flag_delayed_branch
)
1328 warning (0, "this target machine does not have delayed branches");
1331 user_label_prefix
= USER_LABEL_PREFIX
;
1332 if (flag_leading_underscore
!= -1)
1334 /* If the default prefix is more complicated than "" or "_",
1335 issue a warning and ignore this option. */
1336 if (user_label_prefix
[0] == 0 ||
1337 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
1339 user_label_prefix
= flag_leading_underscore
? "_" : "";
1342 warning (0, "-f%sleading-underscore not supported on this target machine",
1343 flag_leading_underscore
? "" : "no-");
1346 /* If we are in verbose mode, write out the version and maybe all the
1347 option flags in use. */
1350 print_version (stderr
, "");
1352 print_switch_values (print_to_stderr
);
1355 if (flag_syntax_only
)
1357 write_symbols
= NO_DEBUG
;
1363 if (debug_info_level
== DINFO_LEVEL_NONE
)
1365 debug_info_level
= DINFO_LEVEL_NORMAL
;
1367 if (write_symbols
== NO_DEBUG
)
1368 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
1371 debug_info_level
= DINFO_LEVEL_NONE
;
1374 if (flag_dump_final_insns
&& !flag_syntax_only
&& !no_backend
)
1376 FILE *final_output
= fopen (flag_dump_final_insns
, "w");
1379 error ("could not open final insn dump file %qs: %m",
1380 flag_dump_final_insns
);
1381 flag_dump_final_insns
= NULL
;
1383 else if (fclose (final_output
))
1385 error ("could not close zeroed insn dump file %qs: %m",
1386 flag_dump_final_insns
);
1387 flag_dump_final_insns
= NULL
;
1391 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1393 if (debug_info_level
== DINFO_LEVEL_NONE
)
1394 write_symbols
= NO_DEBUG
;
1396 if (write_symbols
== NO_DEBUG
)
1398 #if defined(DBX_DEBUGGING_INFO)
1399 else if (write_symbols
== DBX_DEBUG
)
1400 debug_hooks
= &dbx_debug_hooks
;
1402 #if defined(XCOFF_DEBUGGING_INFO)
1403 else if (write_symbols
== XCOFF_DEBUG
)
1404 debug_hooks
= &xcoff_debug_hooks
;
1406 #ifdef SDB_DEBUGGING_INFO
1407 else if (write_symbols
== SDB_DEBUG
)
1408 debug_hooks
= &sdb_debug_hooks
;
1410 #ifdef DWARF2_DEBUGGING_INFO
1411 else if (write_symbols
== DWARF2_DEBUG
)
1412 debug_hooks
= &dwarf2_debug_hooks
;
1414 #ifdef VMS_DEBUGGING_INFO
1415 else if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1416 debug_hooks
= &vmsdbg_debug_hooks
;
1419 error ("target system does not support the \"%s\" debug format",
1420 debug_type_names
[write_symbols
]);
1422 /* We know which debug output will be used so we can set flag_var_tracking
1423 and flag_var_tracking_uninit if the user has not specified them. */
1424 if (debug_info_level
< DINFO_LEVEL_NORMAL
1425 || debug_hooks
->var_location
== do_nothing_debug_hooks
.var_location
)
1427 if (flag_var_tracking
== 1
1428 || flag_var_tracking_uninit
== 1)
1430 if (debug_info_level
< DINFO_LEVEL_NORMAL
)
1431 warning (0, "variable tracking requested, but useless unless "
1432 "producing debug info");
1434 warning (0, "variable tracking requested, but not supported "
1435 "by this debug format");
1437 flag_var_tracking
= 0;
1438 flag_var_tracking_uninit
= 0;
1441 /* The debug hooks are used to implement -fdump-go-spec because it
1442 gives a simple and stable API for all the information we need to
1444 if (flag_dump_go_spec
!= NULL
)
1445 debug_hooks
= dump_go_spec_init (flag_dump_go_spec
, debug_hooks
);
1447 /* If the user specifically requested variable tracking with tagging
1448 uninitialized variables, we need to turn on variable tracking.
1449 (We already determined above that variable tracking is feasible.) */
1450 if (flag_var_tracking_uninit
== 1)
1451 flag_var_tracking
= 1;
1453 if (flag_var_tracking
== AUTODETECT_VALUE
)
1454 flag_var_tracking
= optimize
>= 1;
1456 if (flag_var_tracking_uninit
== AUTODETECT_VALUE
)
1457 flag_var_tracking_uninit
= flag_var_tracking
;
1459 if (flag_var_tracking_assignments
== AUTODETECT_VALUE
)
1460 flag_var_tracking_assignments
= flag_var_tracking
1461 && !(flag_selective_scheduling
|| flag_selective_scheduling2
);
1463 if (flag_var_tracking_assignments_toggle
)
1464 flag_var_tracking_assignments
= !flag_var_tracking_assignments
;
1466 if (flag_var_tracking_assignments
&& !flag_var_tracking
)
1467 flag_var_tracking
= flag_var_tracking_assignments
= -1;
1469 if (flag_var_tracking_assignments
1470 && (flag_selective_scheduling
|| flag_selective_scheduling2
))
1471 warning (0, "var-tracking-assignments changes selective scheduling");
1473 if (flag_tree_cselim
== AUTODETECT_VALUE
)
1474 #ifdef HAVE_conditional_move
1475 flag_tree_cselim
= 1;
1477 flag_tree_cselim
= 0;
1480 /* If auxiliary info generation is desired, open the output file.
1481 This goes in the same directory as the source file--unlike
1482 all the other output files. */
1483 if (flag_gen_aux_info
)
1485 aux_info_file
= fopen (aux_info_file_name
, "w");
1486 if (aux_info_file
== 0)
1487 fatal_error ("can%'t open %s: %m", aux_info_file_name
);
1490 if (!targetm_common
.have_named_sections
)
1492 if (flag_function_sections
)
1494 warning (0, "-ffunction-sections not supported for this target");
1495 flag_function_sections
= 0;
1497 if (flag_data_sections
)
1499 warning (0, "-fdata-sections not supported for this target");
1500 flag_data_sections
= 0;
1504 #ifndef HAVE_prefetch
1505 if (flag_prefetch_loop_arrays
> 0)
1507 warning (0, "-fprefetch-loop-arrays not supported for this target");
1508 flag_prefetch_loop_arrays
= 0;
1511 if (flag_prefetch_loop_arrays
> 0 && !HAVE_prefetch
)
1513 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1514 flag_prefetch_loop_arrays
= 0;
1518 /* This combination of options isn't handled for i386 targets and doesn't
1519 make much sense anyway, so don't allow it. */
1520 if (flag_prefetch_loop_arrays
> 0 && optimize_size
)
1522 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1523 flag_prefetch_loop_arrays
= 0;
1526 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1527 if (flag_signaling_nans
)
1528 flag_trapping_math
= 1;
1530 /* We cannot reassociate if we want traps or signed zeros. */
1531 if (flag_associative_math
&& (flag_trapping_math
|| flag_signed_zeros
))
1533 warning (0, "-fassociative-math disabled; other options take precedence");
1534 flag_associative_math
= 0;
1537 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1538 if (flag_cx_limited_range
)
1539 flag_complex_method
= 0;
1541 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1542 if (flag_cx_fortran_rules
)
1543 flag_complex_method
= 1;
1545 /* Targets must be able to place spill slots at lower addresses. If the
1546 target already uses a soft frame pointer, the transition is trivial. */
1547 if (!FRAME_GROWS_DOWNWARD
&& flag_stack_protect
)
1549 warning (0, "-fstack-protector not supported for this target");
1550 flag_stack_protect
= 0;
1552 if (!flag_stack_protect
)
1553 warn_stack_protect
= 0;
1555 /* Address Sanitizer needs porting to each target architecture. */
1557 if ((flag_sanitize
& SANITIZE_ADDRESS
)
1558 && !FRAME_GROWS_DOWNWARD
)
1561 "-fsanitize=address and -fsanitize=kernel-address "
1562 "are not supported for this target");
1563 flag_sanitize
&= ~SANITIZE_ADDRESS
;
1566 if ((flag_sanitize
& SANITIZE_USER_ADDRESS
)
1567 && targetm
.asan_shadow_offset
== NULL
)
1569 warning (0, "-fsanitize=address not supported for this target");
1570 flag_sanitize
&= ~SANITIZE_ADDRESS
;
1573 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1574 have not been set. */
1575 if (!global_options_set
.x_warnings_are_errors
1576 && warn_coverage_mismatch
1577 && (global_dc
->classify_diagnostic
[OPT_Wcoverage_mismatch
] ==
1579 diagnostic_classify_diagnostic (global_dc
, OPT_Wcoverage_mismatch
,
1580 DK_ERROR
, UNKNOWN_LOCATION
);
1582 /* Save the current optimization options. */
1583 optimization_default_node
= build_optimization_node (&global_options
);
1584 optimization_current_node
= optimization_default_node
;
1587 /* This function can be called multiple times to reinitialize the compiler
1588 back end when register classes or instruction sets have changed,
1589 before each function. */
1591 backend_init_target (void)
1593 /* Initialize alignment variables. */
1596 /* This depends on stack_pointer_rtx. */
1597 init_fake_stack_mems ();
1599 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1601 init_alias_target ();
1603 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1606 /* Depends on the enabled attribute. */
1609 /* The following initialization functions need to generate rtl, so
1610 provide a dummy function context for them. */
1611 init_dummy_function_start ();
1613 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1614 on a mode change. */
1616 init_lower_subreg ();
1619 init_expr_target ();
1622 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1623 after a mode change as well. */
1624 caller_save_initialized_p
= false;
1626 expand_dummy_function_end ();
1629 /* Initialize the compiler back end. This function is called only once,
1630 when starting the compiler. */
1637 init_inline_once ();
1638 init_varasm_once ();
1639 save_register_info ();
1641 /* Middle end needs this initialization for default mem attributes
1642 used by early calls to make_decl_rtl. */
1645 /* Middle end needs this initialization for mode tables used to assign
1646 modes to vector variables. */
1650 /* Initialize excess precision settings. */
1652 init_excess_precision (void)
1654 /* Adjust excess precision handling based on the target options. If
1655 the front end cannot handle it, flag_excess_precision_cmdline
1656 will already have been set accordingly in the post_options
1658 gcc_assert (flag_excess_precision_cmdline
!= EXCESS_PRECISION_DEFAULT
);
1659 flag_excess_precision
= flag_excess_precision_cmdline
;
1660 if (flag_unsafe_math_optimizations
)
1661 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1662 if (flag_excess_precision
== EXCESS_PRECISION_STANDARD
)
1664 int flt_eval_method
= TARGET_FLT_EVAL_METHOD
;
1665 switch (flt_eval_method
)
1669 /* Either the target acts unpredictably (-1) or has all the
1670 operations required not to have excess precision (0). */
1671 flag_excess_precision
= EXCESS_PRECISION_FAST
;
1675 /* In these cases, predictable excess precision makes
1679 /* Any other implementation-defined FLT_EVAL_METHOD values
1680 require the compiler to handle the associated excess
1681 precision rules in excess_precision_type. */
1687 /* Initialize things that are both lang-dependent and target-dependent.
1688 This function can be called more than once if target parameters change. */
1690 lang_dependent_init_target (void)
1692 /* This determines excess precision settings. */
1693 init_excess_precision ();
1695 /* This creates various _DECL nodes, so needs to be called after the
1696 front end is initialized. It also depends on the HAVE_xxx macros
1697 generated from the target machine description. */
1700 gcc_assert (!this_target_rtl
->target_specific_initialized
);
1703 /* Perform initializations that are lang-dependent or target-dependent.
1704 but matters only for late optimizations and RTL generation. */
1707 initialize_rtl (void)
1709 static int initialized_once
;
1711 /* Initialization done just once per compilation, but delayed
1712 till code generation. */
1713 if (!initialized_once
)
1715 initialized_once
= true;
1717 /* Target specific RTL backend initialization. */
1718 if (!this_target_rtl
->target_specific_initialized
)
1720 backend_init_target ();
1721 this_target_rtl
->target_specific_initialized
= true;
1725 /* Language-dependent initialization. Returns nonzero on success. */
1727 lang_dependent_init (const char *name
)
1729 location_t save_loc
= input_location
;
1730 if (dump_base_name
== 0)
1731 dump_base_name
= name
&& name
[0] ? name
: "gccdump";
1733 /* Other front-end initialization. */
1734 input_location
= BUILTINS_LOCATION
;
1735 if (lang_hooks
.init () == 0)
1737 input_location
= save_loc
;
1741 init_asm_output (name
);
1743 /* If stack usage information is desired, open the output file. */
1744 if (flag_stack_usage
)
1745 stack_usage_file
= open_auxiliary_file ("su");
1748 /* This creates various _DECL nodes, so needs to be called after the
1749 front end is initialized. */
1752 /* Do the target-specific parts of the initialization. */
1753 lang_dependent_init_target ();
1757 /* If dbx symbol table desired, initialize writing it and output the
1758 predefined types. */
1759 timevar_push (TV_SYMOUT
);
1761 /* Now we have the correct original filename, we can initialize
1763 (*debug_hooks
->init
) (name
);
1765 timevar_pop (TV_SYMOUT
);
1772 /* Reinitialize everything when target parameters, such as register usage,
1775 target_reinit (void)
1777 struct rtl_data saved_x_rtl
;
1778 rtx
*saved_regno_reg_rtx
;
1779 tree saved_optimization_current_node
;
1780 struct target_optabs
*saved_this_fn_optabs
;
1782 /* Temporarily switch to the default optimization node, so that
1783 *this_target_optabs is set to the default, not reflecting
1784 whatever a previous function used for the optimize
1786 saved_optimization_current_node
= optimization_current_node
;
1787 saved_this_fn_optabs
= this_fn_optabs
;
1788 if (saved_optimization_current_node
!= optimization_default_node
)
1790 optimization_current_node
= optimization_default_node
;
1791 cl_optimization_restore
1793 TREE_OPTIMIZATION (optimization_default_node
));
1795 this_fn_optabs
= this_target_optabs
;
1797 /* Save *crtl and regno_reg_rtx around the reinitialization
1798 to allow target_reinit being called even after prepare_function_start. */
1799 saved_regno_reg_rtx
= regno_reg_rtx
;
1800 if (saved_regno_reg_rtx
)
1802 saved_x_rtl
= *crtl
;
1803 memset (crtl
, '\0', sizeof (*crtl
));
1804 regno_reg_rtx
= NULL
;
1807 this_target_rtl
->target_specific_initialized
= false;
1809 /* This initializes hard_frame_pointer, and calls init_reg_modes_target()
1810 to initialize reg_raw_mode[]. */
1813 /* This invokes target hooks to set fixed_reg[] etc, which is
1817 /* Reinitialize lang-dependent parts. */
1818 lang_dependent_init_target ();
1820 /* Restore the original optimization node. */
1821 if (saved_optimization_current_node
!= optimization_default_node
)
1823 optimization_current_node
= saved_optimization_current_node
;
1824 cl_optimization_restore (&global_options
,
1825 TREE_OPTIMIZATION (optimization_current_node
));
1827 this_fn_optabs
= saved_this_fn_optabs
;
1829 /* Restore regno_reg_rtx at the end, as free_after_compilation from
1830 expand_dummy_function_end clears it. */
1831 if (saved_regno_reg_rtx
)
1833 *crtl
= saved_x_rtl
;
1834 regno_reg_rtx
= saved_regno_reg_rtx
;
1835 saved_regno_reg_rtx
= NULL
;
1840 dump_memory_report (bool final
)
1842 dump_line_table_statistics ();
1843 ggc_print_statistics ();
1844 stringpool_statistics ();
1845 dump_tree_statistics ();
1846 dump_gimple_statistics ();
1847 dump_rtx_statistics ();
1848 dump_alloc_pool_statistics ();
1849 dump_bitmap_statistics ();
1850 dump_vec_loc_statistics ();
1851 dump_ggc_loc_statistics (final
);
1852 dump_alias_stats (stderr
);
1853 dump_pta_stats (stderr
);
1856 /* Clean up: close opened files, etc. */
1859 finalize (bool no_backend
)
1861 /* Close the dump files. */
1862 if (flag_gen_aux_info
)
1864 fclose (aux_info_file
);
1866 unlink (aux_info_file_name
);
1869 /* Close non-debugging input and output files. Take special care to note
1870 whether fclose returns an error, since the pages might still be on the
1871 buffer chain while the file is open. */
1875 if (ferror (asm_out_file
) != 0)
1876 fatal_error ("error writing to %s: %m", asm_file_name
);
1877 if (fclose (asm_out_file
) != 0)
1878 fatal_error ("error closing %s: %m", asm_file_name
);
1881 if (stack_usage_file
)
1882 fclose (stack_usage_file
);
1888 g
->get_passes ()->finish_optimization_passes ();
1894 dump_memory_report (true);
1897 dump_profile_report ();
1899 /* Language-specific end of compilation actions. */
1900 lang_hooks
.finish ();
1903 /* Initialize the compiler, and compile the input file. */
1907 /* Initialize timing first. The C front ends read the main file in
1908 the post_options hook, and C++ does file timings. */
1909 if (time_report
|| !quiet_flag
|| flag_detailed_statistics
)
1911 timevar_start (TV_TOTAL
);
1915 /* Don't do any more if an error has already occurred. */
1918 timevar_start (TV_PHASE_SETUP
);
1920 /* This must be run always, because it is needed to compute the FP
1921 predefined macros, such as __LDBL_MAX__, for targets using non
1922 default FP formats. */
1923 init_adjust_machine_modes ();
1924 init_derived_machine_modes ();
1926 /* Set up the back-end if requested. */
1930 /* Language-dependent initialization. Returns true on success. */
1931 if (lang_dependent_init (main_input_filename
))
1933 /* Initialize yet another pass. */
1935 ggc_protect_identifiers
= true;
1937 symtab
->initialize ();
1938 init_final (main_input_filename
);
1939 coverage_init (aux_base_name
);
1941 invoke_plugin_callbacks (PLUGIN_START_UNIT
, NULL
);
1943 timevar_stop (TV_PHASE_SETUP
);
1949 timevar_stop (TV_PHASE_SETUP
);
1952 timevar_start (TV_PHASE_FINALIZE
);
1954 finalize (no_backend
);
1956 timevar_stop (TV_PHASE_FINALIZE
);
1959 /* Stop timing and print the times. */
1960 timevar_stop (TV_TOTAL
);
1961 timevar_print (stderr
);
1964 /* Entry point of cc1, cc1plus, jc1, f771, etc.
1965 Exit code is FATAL_EXIT_CODE if can't open files or if there were
1966 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
1968 It is not safe to call this function more than once. */
1971 toplev_main (int argc
, char **argv
)
1973 /* Parsing and gimplification sometimes need quite large stack.
1974 Increase stack size limits if possible. */
1975 stack_limit_increase (64 * 1024 * 1024);
1977 expandargv (&argc
, &argv
);
1979 /* Initialization of GCC's environment, and diagnostics. */
1980 general_init (argv
[0]);
1982 /* One-off initialization of options that does not need to be
1983 repeated when options are added for particular functions. */
1984 init_options_once ();
1986 /* Initialize global options structures; this must be repeated for
1987 each structure used for parsing options. */
1988 init_options_struct (&global_options
, &global_options_set
);
1989 lang_hooks
.init_options_struct (&global_options
);
1991 /* Convert the options to an array. */
1992 decode_cmdline_options_to_array_default_mask (argc
,
1993 CONST_CAST2 (const char **,
1995 &save_decoded_options
,
1996 &save_decoded_options_count
);
1998 /* Perform language-specific options initialization. */
1999 lang_hooks
.init_options (save_decoded_options_count
, save_decoded_options
);
2001 /* Parse the options and do minimal processing; basically just
2002 enough to default flags appropriately. */
2003 decode_options (&global_options
, &global_options_set
,
2004 save_decoded_options
, save_decoded_options_count
,
2005 UNKNOWN_LOCATION
, global_dc
);
2007 handle_common_deferred_options ();
2011 initialize_plugins ();
2014 print_version (stderr
, "");
2017 print_plugins_help (stderr
, "");
2019 /* Exit early if we can (e.g. -help). */
2020 if (!exit_after_options
)
2023 if (warningcount
|| errorcount
|| werrorcount
)
2024 print_ignored_options ();
2026 /* Invoke registered plugin callbacks if any. Some plugins could
2027 emit some diagnostics here. */
2028 invoke_plugin_callbacks (PLUGIN_FINISH
, NULL
);
2030 diagnostic_finish (global_dc
);
2032 finalize_plugins ();
2033 location_adhoc_data_fini (line_table
);
2034 if (seen_error () || werrorcount
)
2035 return (FATAL_EXIT_CODE
);
2037 return (SUCCESS_EXIT_CODE
);