2014-07-12 Paul Thomas <pault@gcc.gnu.org>
[official-gcc.git] / gcc / toplev.c
blobe35b826e89d65ca7ac679501c43d868bb12f5946
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
9 version.
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
14 for more details.
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. */
25 #include "config.h"
26 #include "system.h"
27 #include "coretypes.h"
28 #include "tm.h"
29 #include "line-map.h"
30 #include "input.h"
31 #include "tree.h"
32 #include "varasm.h"
33 #include "tree-inline.h"
34 #include "realmpfr.h" /* For GMP/MPFR/MPC versions, in print_version. */
35 #include "version.h"
36 #include "rtl.h"
37 #include "tm_p.h"
38 #include "flags.h"
39 #include "insn-attr.h"
40 #include "insn-config.h"
41 #include "insn-flags.h"
42 #include "hard-reg-set.h"
43 #include "recog.h"
44 #include "output.h"
45 #include "except.h"
46 #include "function.h"
47 #include "toplev.h"
48 #include "expr.h"
49 #include "intl.h"
50 #include "regs.h"
51 #include "timevar.h"
52 #include "diagnostic.h"
53 #include "tree-diagnostic.h"
54 #include "tree-pretty-print.h"
55 #include "params.h"
56 #include "reload.h"
57 #include "ira.h"
58 #include "dwarf2asm.h"
59 #include "debug.h"
60 #include "target.h"
61 #include "common/common-target.h"
62 #include "langhooks.h"
63 #include "cfgloop.h" /* for init_set_costs */
64 #include "hosthooks.h"
65 #include "cgraph.h"
66 #include "opts.h"
67 #include "opts-diagnostic.h"
68 #include "coverage.h"
69 #include "value-prof.h"
70 #include "alloc-pool.h"
71 #include "asan.h"
72 #include "tsan.h"
73 #include "tree-ssa-alias.h"
74 #include "internal-fn.h"
75 #include "gimple-expr.h"
76 #include "gimple.h"
77 #include "plugin.h"
78 #include "diagnostic-color.h"
79 #include "context.h"
80 #include "pass_manager.h"
81 #include "optabs.h"
83 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
84 #include "dbxout.h"
85 #endif
87 #ifdef SDB_DEBUGGING_INFO
88 #include "sdbout.h"
89 #endif
91 #ifdef XCOFF_DEBUGGING_INFO
92 #include "xcoffout.h" /* Needed for external data
93 declarations for e.g. AIX 4.x. */
94 #endif
96 static void general_init (const char *);
97 static void do_compile (void);
98 static void process_options (void);
99 static void backend_init (void);
100 static int lang_dependent_init (const char *);
101 static void init_asm_output (const char *);
102 static void finalize (bool);
104 static void crash_signal (int) ATTRIBUTE_NORETURN;
105 static void compile_file (void);
107 /* True if we don't need a backend (e.g. preprocessing only). */
108 static bool no_backend;
110 /* Length of line when printing switch values. */
111 #define MAX_LINE 75
113 /* Decoded options, and number of such options. */
114 struct cl_decoded_option *save_decoded_options;
115 unsigned int save_decoded_options_count;
117 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
118 to optimize in process_options (). */
119 #define AUTODETECT_VALUE 2
121 /* Debug hooks - dependent upon command line options. */
123 const struct gcc_debug_hooks *debug_hooks;
125 /* The FUNCTION_DECL for the function currently being compiled,
126 or 0 if between functions. */
127 tree current_function_decl;
129 /* Set to the FUNC_BEGIN label of the current function, or NULL
130 if none. */
131 const char * current_function_func_begin_label;
133 /* A random sequence of characters, unless overridden by user. */
134 static const char *flag_random_seed;
136 /* A local time stamp derived from the time of compilation. It will be
137 zero if the system cannot provide a time. It will be -1u, if the
138 user has specified a particular random seed. */
139 unsigned local_tick;
141 /* Random number for this compilation */
142 HOST_WIDE_INT random_seed;
144 /* -f flags. */
146 /* When non-NULL, indicates that whenever space is allocated on the
147 stack, the resulting stack pointer must not pass this
148 address---that is, for stacks that grow downward, the stack pointer
149 must always be greater than or equal to this address; for stacks
150 that grow upward, the stack pointer must be less than this address.
151 At present, the rtx may be either a REG or a SYMBOL_REF, although
152 the support provided depends on the backend. */
153 rtx stack_limit_rtx;
155 /* True if the user has tagged the function with the 'section'
156 attribute. */
158 bool user_defined_section_attribute = false;
160 struct target_flag_state default_target_flag_state;
161 #if SWITCHABLE_TARGET
162 struct target_flag_state *this_target_flag_state = &default_target_flag_state;
163 #else
164 #define this_target_flag_state (&default_target_flag_state)
165 #endif
167 /* The user symbol prefix after having resolved same. */
168 const char *user_label_prefix;
170 /* Output files for assembler code (real compiler output)
171 and debugging dumps. */
173 FILE *asm_out_file;
174 FILE *aux_info_file;
175 FILE *stack_usage_file = NULL;
177 /* The current working directory of a translation. It's generally the
178 directory from which compilation was initiated, but a preprocessed
179 file may specify the original directory in which it was
180 created. */
182 static const char *src_pwd;
184 /* Initialize src_pwd with the given string, and return true. If it
185 was already initialized, return false. As a special case, it may
186 be called with a NULL argument to test whether src_pwd has NOT been
187 initialized yet. */
189 bool
190 set_src_pwd (const char *pwd)
192 if (src_pwd)
194 if (strcmp (src_pwd, pwd) == 0)
195 return true;
196 else
197 return false;
200 src_pwd = xstrdup (pwd);
201 return true;
204 /* Return the directory from which the translation unit was initiated,
205 in case set_src_pwd() was not called before to assign it a
206 different value. */
208 const char *
209 get_src_pwd (void)
211 if (! src_pwd)
213 src_pwd = getpwd ();
214 if (!src_pwd)
215 src_pwd = ".";
218 return src_pwd;
221 /* Called when the start of a function definition is parsed,
222 this function prints on stderr the name of the function. */
223 void
224 announce_function (tree decl)
226 if (!quiet_flag)
228 if (rtl_dump_and_exit)
229 fprintf (stderr, "%s ",
230 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl))));
231 else
232 fprintf (stderr, " %s",
233 identifier_to_locale (lang_hooks.decl_printable_name (decl, 2)));
234 fflush (stderr);
235 pp_needs_newline (global_dc->printer) = true;
236 diagnostic_set_last_function (global_dc, (diagnostic_info *) NULL);
240 /* Initialize local_tick with a random number or -1 if
241 flag_random_seed is set. */
243 static void
244 init_local_tick (void)
246 if (!flag_random_seed)
248 /* Try urandom first. Time of day is too likely to collide.
249 In case of any error we just use the local tick. */
251 int fd = open ("/dev/urandom", O_RDONLY);
252 if (fd >= 0)
254 read (fd, &random_seed, sizeof (random_seed));
255 close (fd);
258 /* Now get the tick anyways */
259 #ifdef HAVE_GETTIMEOFDAY
261 struct timeval tv;
263 gettimeofday (&tv, NULL);
264 local_tick = (unsigned) tv.tv_sec * 1000 + tv.tv_usec / 1000;
266 #else
268 time_t now = time (NULL);
270 if (now != (time_t)-1)
271 local_tick = (unsigned) now;
273 #endif
275 else
276 local_tick = -1;
279 /* Set up a default flag_random_seed and local_tick, unless the user
280 already specified one. Must be called after init_local_tick. */
282 static void
283 init_random_seed (void)
285 if (flag_random_seed)
287 char *endp;
289 /* When the driver passed in a hex number don't crc it again */
290 random_seed = strtoul (flag_random_seed, &endp, 0);
291 if (!(endp > flag_random_seed && *endp == 0))
292 random_seed = crc32_string (0, flag_random_seed);
294 else if (!random_seed)
295 random_seed = local_tick ^ getpid (); /* Old racey fallback method */
298 /* Obtain the random_seed. Unless NOINIT, initialize it if
299 it's not provided in the command line. */
301 HOST_WIDE_INT
302 get_random_seed (bool noinit)
304 if (!flag_random_seed && !noinit)
305 init_random_seed ();
306 return random_seed;
309 /* Modify the random_seed string to VAL. Return its previous
310 value. */
312 const char *
313 set_random_seed (const char *val)
315 const char *old = flag_random_seed;
316 flag_random_seed = val;
317 return old;
320 /* Handler for fatal signals, such as SIGSEGV. These are transformed
321 into ICE messages, which is much more user friendly. In case the
322 error printer crashes, reset the signal to prevent infinite recursion. */
324 static void
325 crash_signal (int signo)
327 signal (signo, SIG_DFL);
329 /* If we crashed while processing an ASM statement, then be a little more
330 graceful. It's most likely the user's fault. */
331 if (this_is_asm_operands)
333 output_operand_lossage ("unrecoverable error");
334 exit (FATAL_EXIT_CODE);
337 internal_error ("%s", strsignal (signo));
340 /* A subroutine of wrapup_global_declarations. We've come to the end of
341 the compilation unit. All deferred variables should be undeferred,
342 and all incomplete decls should be finalized. */
344 void
345 wrapup_global_declaration_1 (tree decl)
347 /* We're not deferring this any longer. Assignment is conditional to
348 avoid needlessly dirtying PCH pages. */
349 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl), TS_DECL_WITH_VIS)
350 && DECL_DEFER_OUTPUT (decl) != 0)
351 DECL_DEFER_OUTPUT (decl) = 0;
353 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
354 lang_hooks.finish_incomplete_decl (decl);
357 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
358 needs to be output. Return true if it is output. */
360 bool
361 wrapup_global_declaration_2 (tree decl)
363 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl)
364 || (TREE_CODE (decl) == VAR_DECL && DECL_HAS_VALUE_EXPR_P (decl)))
365 return false;
367 /* Don't write out static consts, unless we still need them.
369 We also keep static consts if not optimizing (for debugging),
370 unless the user specified -fno-keep-static-consts.
371 ??? They might be better written into the debug information.
372 This is possible when using DWARF.
374 A language processor that wants static constants to be always
375 written out (even if it is not used) is responsible for
376 calling rest_of_decl_compilation itself. E.g. the C front-end
377 calls rest_of_decl_compilation from finish_decl.
378 One motivation for this is that is conventional in some
379 environments to write things like:
380 static const char rcsid[] = "... version string ...";
381 intending to force the string to be in the executable.
383 A language processor that would prefer to have unneeded
384 static constants "optimized away" would just defer writing
385 them out until here. E.g. C++ does this, because static
386 constants are often defined in header files.
388 ??? A tempting alternative (for both C and C++) would be
389 to force a constant to be written if and only if it is
390 defined in a main file, as opposed to an include file. */
392 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
394 varpool_node *node;
395 bool needed = true;
396 node = varpool_get_node (decl);
398 if (!node && flag_ltrans)
399 needed = false;
400 else if (node && node->definition)
401 needed = false;
402 else if (node && node->alias)
403 needed = false;
404 else if (!cgraph_global_info_ready
405 && (TREE_USED (decl)
406 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
407 /* needed */;
408 else if (node && node->analyzed)
409 /* needed */;
410 else if (DECL_COMDAT (decl))
411 needed = false;
412 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
413 && (optimize || !flag_keep_static_consts
414 || DECL_ARTIFICIAL (decl)))
415 needed = false;
417 if (needed)
419 rest_of_decl_compilation (decl, 1, 1);
420 return true;
424 return false;
427 /* Do any final processing required for the declarations in VEC, of
428 which there are LEN. We write out inline functions and variables
429 that have been deferred until this point, but which are required.
430 Returns nonzero if anything was put out. */
432 bool
433 wrapup_global_declarations (tree *vec, int len)
435 bool reconsider, output_something = false;
436 int i;
438 for (i = 0; i < len; i++)
439 wrapup_global_declaration_1 (vec[i]);
441 /* Now emit any global variables or functions that we have been
442 putting off. We need to loop in case one of the things emitted
443 here references another one which comes earlier in the list. */
446 reconsider = false;
447 for (i = 0; i < len; i++)
448 reconsider |= wrapup_global_declaration_2 (vec[i]);
449 if (reconsider)
450 output_something = true;
452 while (reconsider);
454 return output_something;
457 /* A subroutine of check_global_declarations. Issue appropriate warnings
458 for the global declaration DECL. */
460 void
461 check_global_declaration_1 (tree decl)
463 /* Warn about any function declared static but not defined. We don't
464 warn about variables, because many programs have static variables
465 that exist only to get some text into the object file. */
466 if (TREE_CODE (decl) == FUNCTION_DECL
467 && DECL_INITIAL (decl) == 0
468 && DECL_EXTERNAL (decl)
469 && ! DECL_ARTIFICIAL (decl)
470 && ! TREE_NO_WARNING (decl)
471 && ! TREE_PUBLIC (decl)
472 && (warn_unused_function
473 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
475 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
476 pedwarn (input_location, 0, "%q+F used but never defined", decl);
477 else
478 warning (OPT_Wunused_function, "%q+F declared %<static%> but never defined", decl);
479 /* This symbol is effectively an "extern" declaration now. */
480 TREE_PUBLIC (decl) = 1;
483 /* Warn about static fns or vars defined but not used. */
484 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
485 /* We don't warn about "static const" variables because the
486 "rcs_id" idiom uses that construction. */
487 || (warn_unused_variable
488 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
489 && ! DECL_IN_SYSTEM_HEADER (decl)
490 && ! TREE_USED (decl)
491 /* The TREE_USED bit for file-scope decls is kept in the identifier,
492 to handle multiple external decls in different scopes. */
493 && ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl)))
494 && ! DECL_EXTERNAL (decl)
495 && ! TREE_PUBLIC (decl)
496 /* A volatile variable might be used in some non-obvious way. */
497 && ! TREE_THIS_VOLATILE (decl)
498 /* Global register variables must be declared to reserve them. */
499 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
500 /* Otherwise, ask the language. */
501 && lang_hooks.decls.warn_unused_global (decl))
502 warning ((TREE_CODE (decl) == FUNCTION_DECL)
503 ? OPT_Wunused_function
504 : OPT_Wunused_variable,
505 "%q+D defined but not used", decl);
508 /* Issue appropriate warnings for the global declarations in V (of
509 which there are LEN). */
511 void
512 check_global_declarations (tree *v, int len)
514 int i;
516 for (i = 0; i < len; i++)
517 check_global_declaration_1 (v[i]);
520 /* Emit debugging information for all global declarations in VEC. */
522 void
523 emit_debug_global_declarations (tree *vec, int len)
525 int i;
527 /* Avoid confusing the debug information machinery when there are errors. */
528 if (seen_error ())
529 return;
531 timevar_push (TV_SYMOUT);
532 for (i = 0; i < len; i++)
533 debug_hooks->global_decl (vec[i]);
534 timevar_pop (TV_SYMOUT);
537 /* Compile an entire translation unit. Write a file of assembly
538 output and various debugging dumps. */
540 static void
541 compile_file (void)
543 timevar_start (TV_PHASE_PARSING);
544 timevar_push (TV_PARSE_GLOBAL);
546 /* Call the parser, which parses the entire file (calling
547 rest_of_compilation for each function). */
548 lang_hooks.parse_file ();
550 timevar_pop (TV_PARSE_GLOBAL);
551 timevar_stop (TV_PHASE_PARSING);
553 /* Compilation is now finished except for writing
554 what's left of the symbol table output. */
556 if (flag_syntax_only || flag_wpa)
557 return;
559 ggc_protect_identifiers = false;
561 /* This must also call finalize_compilation_unit. */
562 lang_hooks.decls.final_write_globals ();
564 if (seen_error ())
565 return;
567 timevar_start (TV_PHASE_LATE_ASM);
569 /* Compilation unit is finalized. When producing non-fat LTO object, we are
570 basically finished. */
571 if (in_lto_p || !flag_lto || flag_fat_lto_objects)
573 /* File-scope initialization for AddressSanitizer. */
574 if (flag_sanitize & SANITIZE_ADDRESS)
575 asan_finish_file ();
577 if (flag_sanitize & SANITIZE_THREAD)
578 tsan_finish_file ();
580 output_shared_constant_pool ();
581 output_object_blocks ();
582 finish_tm_clone_pairs ();
584 /* Write out any pending weak symbol declarations. */
585 weak_finish ();
587 /* This must be at the end before unwind and debug info.
588 Some target ports emit PIC setup thunks here. */
589 targetm.asm_out.code_end ();
591 /* Do dbx symbols. */
592 timevar_push (TV_SYMOUT);
594 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
595 if (dwarf2out_do_frame ())
596 dwarf2out_frame_finish ();
597 #endif
599 (*debug_hooks->finish) (main_input_filename);
600 timevar_pop (TV_SYMOUT);
602 /* Output some stuff at end of file if nec. */
604 dw2_output_indirect_constants ();
606 /* Flush any pending external directives. */
607 process_pending_assemble_externals ();
610 /* Emit LTO marker if LTO info has been previously emitted. This is
611 used by collect2 to determine whether an object file contains IL.
612 We used to emit an undefined reference here, but this produces
613 link errors if an object file with IL is stored into a shared
614 library without invoking lto1. */
615 if (flag_generate_lto)
617 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
618 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
619 "__gnu_lto_v1",
620 (unsigned HOST_WIDE_INT) 1, 8);
621 #elif defined ASM_OUTPUT_ALIGNED_COMMON
622 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_v1",
623 (unsigned HOST_WIDE_INT) 1, 8);
624 #else
625 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_v1",
626 (unsigned HOST_WIDE_INT) 1,
627 (unsigned HOST_WIDE_INT) 1);
628 #endif
629 /* Let linker plugin know that this is a slim object and must be LTOed
630 even when user did not ask for it. */
631 if (!flag_fat_lto_objects)
633 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
634 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
635 "__gnu_lto_slim",
636 (unsigned HOST_WIDE_INT) 1, 8);
637 #elif defined ASM_OUTPUT_ALIGNED_COMMON
638 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_slim",
639 (unsigned HOST_WIDE_INT) 1, 8);
640 #else
641 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_slim",
642 (unsigned HOST_WIDE_INT) 1,
643 (unsigned HOST_WIDE_INT) 1);
644 #endif
648 /* Attach a special .ident directive to the end of the file to identify
649 the version of GCC which compiled this code. The format of the .ident
650 string is patterned after the ones produced by native SVR4 compilers. */
651 if (!flag_no_ident)
653 const char *pkg_version = "(GNU) ";
654 char *ident_str;
656 if (strcmp ("(GCC) ", pkgversion_string))
657 pkg_version = pkgversion_string;
659 ident_str = ACONCAT (("GCC: ", pkg_version, version_string, NULL));
660 targetm.asm_out.output_ident (ident_str);
663 /* Invoke registered plugin callbacks. */
664 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT, NULL);
666 /* This must be at the end. Some target ports emit end of file directives
667 into the assembly file here, and hence we can not output anything to the
668 assembly file after this point. */
669 targetm.asm_out.file_end ();
671 timevar_stop (TV_PHASE_LATE_ASM);
674 /* Print version information to FILE.
675 Each line begins with INDENT (for the case where FILE is the
676 assembler output file). */
678 void
679 print_version (FILE *file, const char *indent)
681 static const char fmt1[] =
682 #ifdef __GNUC__
683 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
684 #else
685 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
686 #endif
688 static const char fmt2[] =
689 N_("GMP version %s, MPFR version %s, MPC version %s\n");
690 static const char fmt3[] =
691 N_("%s%swarning: %s header version %s differs from library version %s.\n");
692 static const char fmt4[] =
693 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
694 #ifndef __VERSION__
695 #define __VERSION__ "[?]"
696 #endif
697 fprintf (file,
698 file == stderr ? _(fmt1) : fmt1,
699 indent, *indent != 0 ? " " : "",
700 lang_hooks.name, pkgversion_string, version_string, TARGET_NAME,
701 indent, __VERSION__);
703 /* We need to stringify the GMP macro values. Ugh, gmp_version has
704 two string formats, "i.j.k" and "i.j" when k is zero. As of
705 gmp-4.3.0, GMP always uses the 3 number format. */
706 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
707 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3 (X)
708 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
709 #define GCC_GMP_VERSION \
710 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
711 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
712 #define GCC_GMP_STRINGIFY_VERSION \
713 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
714 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR)
715 #else
716 #define GCC_GMP_STRINGIFY_VERSION \
717 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION) "." \
718 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_MINOR) "." \
719 GCC_GMP_STRINGIFY_VERSION2 (__GNU_MP_VERSION_PATCHLEVEL)
720 #endif
721 fprintf (file,
722 file == stderr ? _(fmt2) : fmt2,
723 GCC_GMP_STRINGIFY_VERSION, MPFR_VERSION_STRING, MPC_VERSION_STRING);
724 if (strcmp (GCC_GMP_STRINGIFY_VERSION, gmp_version))
725 fprintf (file,
726 file == stderr ? _(fmt3) : fmt3,
727 indent, *indent != 0 ? " " : "",
728 "GMP", GCC_GMP_STRINGIFY_VERSION, gmp_version);
729 if (strcmp (MPFR_VERSION_STRING, mpfr_get_version ()))
730 fprintf (file,
731 file == stderr ? _(fmt3) : fmt3,
732 indent, *indent != 0 ? " " : "",
733 "MPFR", MPFR_VERSION_STRING, mpfr_get_version ());
734 if (strcmp (MPC_VERSION_STRING, mpc_get_version ()))
735 fprintf (file,
736 file == stderr ? _(fmt3) : fmt3,
737 indent, *indent != 0 ? " " : "",
738 "MPC", MPC_VERSION_STRING, mpc_get_version ());
739 fprintf (file,
740 file == stderr ? _(fmt4) : fmt4,
741 indent, *indent != 0 ? " " : "",
742 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
744 print_plugins_versions (file, indent);
747 static int
748 print_to_asm_out_file (print_switch_type type, const char * text)
750 bool prepend_sep = true;
752 switch (type)
754 case SWITCH_TYPE_LINE_END:
755 putc ('\n', asm_out_file);
756 return 1;
758 case SWITCH_TYPE_LINE_START:
759 fputs (ASM_COMMENT_START, asm_out_file);
760 return strlen (ASM_COMMENT_START);
762 case SWITCH_TYPE_DESCRIPTIVE:
763 if (ASM_COMMENT_START[0] == 0)
764 prepend_sep = false;
765 /* Drop through. */
766 case SWITCH_TYPE_PASSED:
767 case SWITCH_TYPE_ENABLED:
768 if (prepend_sep)
769 fputc (' ', asm_out_file);
770 fputs (text, asm_out_file);
771 /* No need to return the length here as
772 print_single_switch has already done it. */
773 return 0;
775 default:
776 return -1;
780 static int
781 print_to_stderr (print_switch_type type, const char * text)
783 switch (type)
785 case SWITCH_TYPE_LINE_END:
786 putc ('\n', stderr);
787 return 1;
789 case SWITCH_TYPE_LINE_START:
790 return 0;
792 case SWITCH_TYPE_PASSED:
793 case SWITCH_TYPE_ENABLED:
794 fputc (' ', stderr);
795 /* Drop through. */
797 case SWITCH_TYPE_DESCRIPTIVE:
798 fputs (text, stderr);
799 /* No need to return the length here as
800 print_single_switch has already done it. */
801 return 0;
803 default:
804 return -1;
808 /* Print an option value and return the adjusted position in the line.
809 ??? print_fn doesn't handle errors, eg disk full; presumably other
810 code will catch a disk full though. */
812 static int
813 print_single_switch (print_switch_fn_type print_fn,
814 int pos,
815 print_switch_type type,
816 const char * text)
818 /* The ultrix fprintf returns 0 on success, so compute the result
819 we want here since we need it for the following test. The +1
820 is for the separator character that will probably be emitted. */
821 int len = strlen (text) + 1;
823 if (pos != 0
824 && pos + len > MAX_LINE)
826 print_fn (SWITCH_TYPE_LINE_END, NULL);
827 pos = 0;
830 if (pos == 0)
831 pos += print_fn (SWITCH_TYPE_LINE_START, NULL);
833 print_fn (type, text);
834 return pos + len;
837 /* Print active target switches using PRINT_FN.
838 POS is the current cursor position and MAX is the size of a "line".
839 Each line begins with INDENT and ends with TERM.
840 Each switch is separated from the next by SEP. */
842 static void
843 print_switch_values (print_switch_fn_type print_fn)
845 int pos = 0;
846 size_t j;
848 /* Fill in the -frandom-seed option, if the user didn't pass it, so
849 that it can be printed below. This helps reproducibility. */
850 if (!flag_random_seed)
851 init_random_seed ();
853 /* Print the options as passed. */
854 pos = print_single_switch (print_fn, pos,
855 SWITCH_TYPE_DESCRIPTIVE, _("options passed: "));
857 for (j = 1; j < save_decoded_options_count; j++)
859 switch (save_decoded_options[j].opt_index)
861 case OPT_o:
862 case OPT_d:
863 case OPT_dumpbase:
864 case OPT_dumpdir:
865 case OPT_auxbase:
866 case OPT_quiet:
867 case OPT_version:
868 /* Ignore these. */
869 continue;
872 pos = print_single_switch (print_fn, pos, SWITCH_TYPE_PASSED,
873 save_decoded_options[j].orig_option_with_args_text);
876 if (pos > 0)
877 print_fn (SWITCH_TYPE_LINE_END, NULL);
879 /* Print the -f and -m options that have been enabled.
880 We don't handle language specific options but printing argv
881 should suffice. */
882 pos = print_single_switch (print_fn, 0,
883 SWITCH_TYPE_DESCRIPTIVE, _("options enabled: "));
885 for (j = 0; j < cl_options_count; j++)
886 if (cl_options[j].cl_report
887 && option_enabled (j, &global_options) > 0)
888 pos = print_single_switch (print_fn, pos,
889 SWITCH_TYPE_ENABLED, cl_options[j].opt_text);
891 print_fn (SWITCH_TYPE_LINE_END, NULL);
894 /* Open assembly code output file. Do this even if -fsyntax-only is
895 on, because then the driver will have provided the name of a
896 temporary file or bit bucket for us. NAME is the file specified on
897 the command line, possibly NULL. */
898 static void
899 init_asm_output (const char *name)
901 if (name == NULL && asm_file_name == 0)
902 asm_out_file = stdout;
903 else
905 if (asm_file_name == 0)
907 int len = strlen (dump_base_name);
908 char *dumpname = XNEWVEC (char, len + 6);
910 memcpy (dumpname, dump_base_name, len + 1);
911 strip_off_ending (dumpname, len);
912 strcat (dumpname, ".s");
913 asm_file_name = dumpname;
915 if (!strcmp (asm_file_name, "-"))
916 asm_out_file = stdout;
917 else
918 asm_out_file = fopen (asm_file_name, "w");
919 if (asm_out_file == 0)
920 fatal_error ("can%'t open %s for writing: %m", asm_file_name);
923 if (!flag_syntax_only)
925 targetm.asm_out.file_start ();
927 if (flag_record_gcc_switches)
929 if (targetm.asm_out.record_gcc_switches)
931 /* Let the target know that we are about to start recording. */
932 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
933 NULL);
934 /* Now record the switches. */
935 print_switch_values (targetm.asm_out.record_gcc_switches);
936 /* Let the target know that the recording is over. */
937 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
938 NULL);
940 else
941 inform (input_location, "-frecord-gcc-switches is not supported by the current target");
944 if (flag_verbose_asm)
946 /* Print the list of switches in effect
947 into the assembler file as comments. */
948 print_version (asm_out_file, ASM_COMMENT_START);
949 print_switch_values (print_to_asm_out_file);
950 putc ('\n', asm_out_file);
955 /* A helper function; used as the reallocator function for cpp's line
956 table. */
957 static void *
958 realloc_for_line_map (void *ptr, size_t len)
960 return ggc_realloc (ptr, len);
963 /* A helper function: used as the allocator function for
964 identifier_to_locale. */
965 static void *
966 alloc_for_identifier_to_locale (size_t len)
968 return ggc_alloc_atomic (len);
971 /* Output stack usage information. */
972 void
973 output_stack_usage (void)
975 static bool warning_issued = false;
976 enum stack_usage_kind_type { STATIC = 0, DYNAMIC, DYNAMIC_BOUNDED };
977 const char *stack_usage_kind_str[] = {
978 "static",
979 "dynamic",
980 "dynamic,bounded"
982 HOST_WIDE_INT stack_usage = current_function_static_stack_size;
983 enum stack_usage_kind_type stack_usage_kind;
985 if (stack_usage < 0)
987 if (!warning_issued)
989 warning (0, "stack usage computation not supported for this target");
990 warning_issued = true;
992 return;
995 stack_usage_kind = STATIC;
997 /* Add the maximum amount of space pushed onto the stack. */
998 if (current_function_pushed_stack_size > 0)
1000 stack_usage += current_function_pushed_stack_size;
1001 stack_usage_kind = DYNAMIC_BOUNDED;
1004 /* Now on to the tricky part: dynamic stack allocation. */
1005 if (current_function_allocates_dynamic_stack_space)
1007 if (current_function_has_unbounded_dynamic_stack_size)
1008 stack_usage_kind = DYNAMIC;
1009 else
1010 stack_usage_kind = DYNAMIC_BOUNDED;
1012 /* Add the size even in the unbounded case, this can't hurt. */
1013 stack_usage += current_function_dynamic_stack_size;
1016 if (flag_stack_usage)
1018 expanded_location loc
1019 = expand_location (DECL_SOURCE_LOCATION (current_function_decl));
1020 /* We don't want to print the full qualified name because it can be long,
1021 so we strip the scope prefix, but we may need to deal with the suffix
1022 created by the compiler. */
1023 const char *suffix
1024 = strchr (IDENTIFIER_POINTER (DECL_NAME (current_function_decl)), '.');
1025 const char *name
1026 = lang_hooks.decl_printable_name (current_function_decl, 2);
1027 if (suffix)
1029 const char *dot = strchr (name, '.');
1030 while (dot && strcasecmp (dot, suffix) != 0)
1032 name = dot + 1;
1033 dot = strchr (name, '.');
1036 else
1038 const char *dot = strrchr (name, '.');
1039 if (dot)
1040 name = dot + 1;
1043 fprintf (stack_usage_file,
1044 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC"\t%s\n",
1045 lbasename (loc.file),
1046 loc.line,
1047 loc.column,
1048 name,
1049 stack_usage,
1050 stack_usage_kind_str[stack_usage_kind]);
1053 if (warn_stack_usage >= 0)
1055 if (stack_usage_kind == DYNAMIC)
1056 warning (OPT_Wstack_usage_, "stack usage might be unbounded");
1057 else if (stack_usage > warn_stack_usage)
1059 if (stack_usage_kind == DYNAMIC_BOUNDED)
1060 warning (OPT_Wstack_usage_, "stack usage might be %wd bytes",
1061 stack_usage);
1062 else
1063 warning (OPT_Wstack_usage_, "stack usage is %wd bytes",
1064 stack_usage);
1069 /* Open an auxiliary output file. */
1070 static FILE *
1071 open_auxiliary_file (const char *ext)
1073 char *filename;
1074 FILE *file;
1076 filename = concat (aux_base_name, ".", ext, NULL);
1077 file = fopen (filename, "w");
1078 if (!file)
1079 fatal_error ("can%'t open %s for writing: %m", filename);
1080 free (filename);
1081 return file;
1084 /* Initialization of the front end environment, before command line
1085 options are parsed. Signal handlers, internationalization etc.
1086 ARGV0 is main's argv[0]. */
1087 static void
1088 general_init (const char *argv0)
1090 const char *p;
1092 p = argv0 + strlen (argv0);
1093 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1094 --p;
1095 progname = p;
1097 xmalloc_set_program_name (progname);
1099 hex_init ();
1101 /* Unlock the stdio streams. */
1102 unlock_std_streams ();
1104 gcc_init_libintl ();
1106 identifier_to_locale_alloc = alloc_for_identifier_to_locale;
1107 identifier_to_locale_free = ggc_free;
1109 /* Initialize the diagnostics reporting machinery, so option parsing
1110 can give warnings and errors. */
1111 diagnostic_initialize (global_dc, N_OPTS);
1112 /* Set a default printer. Language specific initializations will
1113 override it later. */
1114 tree_diagnostics_defaults (global_dc);
1115 /* FIXME: This should probably be moved to C-family
1116 language-specific initializations. */
1117 /* By default print macro expansion contexts in the diagnostic
1118 finalizer -- for tokens resulting from macro expansion. */
1119 diagnostic_finalizer (global_dc) = virt_loc_aware_diagnostic_finalizer;
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. */
1133 #ifdef SIGSEGV
1134 signal (SIGSEGV, crash_signal);
1135 #endif
1136 #ifdef SIGILL
1137 signal (SIGILL, crash_signal);
1138 #endif
1139 #ifdef SIGBUS
1140 signal (SIGBUS, crash_signal);
1141 #endif
1142 #ifdef SIGABRT
1143 signal (SIGABRT, crash_signal);
1144 #endif
1145 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1146 signal (SIGIOT, crash_signal);
1147 #endif
1148 #ifdef SIGFPE
1149 signal (SIGFPE, crash_signal);
1150 #endif
1152 /* Other host-specific signal setup. */
1153 (*host_hooks.extra_signals)();
1155 /* Initialize the garbage-collector, string pools and tree type hash
1156 table. */
1157 init_ggc ();
1158 init_stringpool ();
1159 line_table = ggc_alloc<line_maps> ();
1160 linemap_init (line_table);
1161 line_table->reallocator = realloc_for_line_map;
1162 line_table->round_alloc_size = ggc_round_alloc_size;
1163 init_ttree ();
1165 /* Initialize register usage now so switches may override. */
1166 init_reg_sets ();
1168 /* Register the language-independent parameters. */
1169 global_init_params ();
1171 /* This must be done after global_init_params but before argument
1172 processing. */
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 ();
1179 statistics_early_init ();
1180 finish_params ();
1183 /* Return true if the current target supports -fsection-anchors. */
1185 static bool
1186 target_supports_section_anchors_p (void)
1188 if (targetm.min_anchor_offset == 0 && targetm.max_anchor_offset == 0)
1189 return false;
1191 if (targetm.asm_out.output_anchor == NULL)
1192 return false;
1194 return true;
1197 /* Default the align_* variables to 1 if they're still unset, and
1198 set up the align_*_log variables. */
1199 static void
1200 init_alignments (void)
1202 if (align_loops <= 0)
1203 align_loops = 1;
1204 if (align_loops_max_skip > align_loops)
1205 align_loops_max_skip = align_loops - 1;
1206 align_loops_log = floor_log2 (align_loops * 2 - 1);
1207 if (align_jumps <= 0)
1208 align_jumps = 1;
1209 if (align_jumps_max_skip > align_jumps)
1210 align_jumps_max_skip = align_jumps - 1;
1211 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1212 if (align_labels <= 0)
1213 align_labels = 1;
1214 align_labels_log = floor_log2 (align_labels * 2 - 1);
1215 if (align_labels_max_skip > align_labels)
1216 align_labels_max_skip = align_labels - 1;
1217 if (align_functions <= 0)
1218 align_functions = 1;
1219 align_functions_log = floor_log2 (align_functions * 2 - 1);
1222 /* Process the options that have been parsed. */
1223 static void
1224 process_options (void)
1226 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1227 This can happen with incorrect pre-processed input. */
1228 debug_hooks = &do_nothing_debug_hooks;
1230 maximum_field_alignment = initial_max_fld_align * BITS_PER_UNIT;
1232 /* Default to -fdiagnostics-color=auto if GCC_COLORS is in the environment,
1233 otherwise default to -fdiagnostics-color=never. */
1234 if (!global_options_set.x_flag_diagnostics_show_color
1235 && getenv ("GCC_COLORS"))
1236 pp_show_color (global_dc->printer)
1237 = colorize_init (DIAGNOSTICS_COLOR_AUTO);
1239 /* Allow the front end to perform consistency checks and do further
1240 initialization based on the command line options. This hook also
1241 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1242 so we can correctly initialize debug output. */
1243 no_backend = lang_hooks.post_options (&main_input_filename);
1245 /* Some machines may reject certain combinations of options. */
1246 targetm.target_option.override ();
1248 /* Avoid any informative notes in the second run of -fcompare-debug. */
1249 if (flag_compare_debug)
1250 diagnostic_inhibit_notes (global_dc);
1252 if (flag_section_anchors && !target_supports_section_anchors_p ())
1254 warning (OPT_fsection_anchors,
1255 "this target does not support %qs", "-fsection-anchors");
1256 flag_section_anchors = 0;
1259 if (flag_short_enums == 2)
1260 flag_short_enums = targetm.default_short_enums ();
1262 /* Set aux_base_name if not already set. */
1263 if (aux_base_name)
1265 else if (main_input_filename)
1267 char *name = xstrdup (lbasename (main_input_filename));
1269 strip_off_ending (name, strlen (name));
1270 aux_base_name = name;
1272 else
1273 aux_base_name = "gccaux";
1275 #ifndef HAVE_cloog
1276 if (flag_graphite
1277 || flag_graphite_identity
1278 || flag_loop_block
1279 || flag_loop_interchange
1280 || flag_loop_strip_mine
1281 || flag_loop_parallelize_all)
1282 sorry ("Graphite loop optimizations cannot be used (-fgraphite, "
1283 "-fgraphite-identity, -floop-block, "
1284 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1285 "and -ftree-loop-linear)");
1286 #endif
1288 /* One region RA really helps to decrease the code size. */
1289 if (flag_ira_region == IRA_REGION_AUTODETECT)
1290 flag_ira_region
1291 = optimize_size || !optimize ? IRA_REGION_ONE : IRA_REGION_MIXED;
1293 if (!abi_version_at_least (2))
1295 /* -fabi-version=1 support was removed after GCC 4.9. */
1296 error ("%<-fabi-version=1%> is no longer supported");
1297 flag_abi_version = 2;
1300 /* Unrolling all loops implies that standard loop unrolling must also
1301 be done. */
1302 if (flag_unroll_all_loops)
1303 flag_unroll_loops = 1;
1305 /* web and rename-registers help when run after loop unrolling. */
1306 if (flag_web == AUTODETECT_VALUE)
1307 flag_web = flag_unroll_loops || flag_peel_loops;
1309 if (flag_rename_registers == AUTODETECT_VALUE)
1310 flag_rename_registers = flag_unroll_loops || flag_peel_loops;
1312 if (flag_non_call_exceptions)
1313 flag_asynchronous_unwind_tables = 1;
1314 if (flag_asynchronous_unwind_tables)
1315 flag_unwind_tables = 1;
1317 if (flag_value_profile_transformations)
1318 flag_profile_values = 1;
1320 /* Warn about options that are not supported on this machine. */
1321 #ifndef INSN_SCHEDULING
1322 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1323 warning (0, "instruction scheduling not supported on this target machine");
1324 #endif
1325 #ifndef DELAY_SLOTS
1326 if (flag_delayed_branch)
1327 warning (0, "this target machine does not have delayed branches");
1328 #endif
1330 user_label_prefix = USER_LABEL_PREFIX;
1331 if (flag_leading_underscore != -1)
1333 /* If the default prefix is more complicated than "" or "_",
1334 issue a warning and ignore this option. */
1335 if (user_label_prefix[0] == 0 ||
1336 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1338 user_label_prefix = flag_leading_underscore ? "_" : "";
1340 else
1341 warning (0, "-f%sleading-underscore not supported on this target machine",
1342 flag_leading_underscore ? "" : "no-");
1345 /* If we are in verbose mode, write out the version and maybe all the
1346 option flags in use. */
1347 if (version_flag)
1349 print_version (stderr, "");
1350 if (! quiet_flag)
1351 print_switch_values (print_to_stderr);
1354 if (flag_syntax_only)
1356 write_symbols = NO_DEBUG;
1357 profile_flag = 0;
1360 if (flag_gtoggle)
1362 if (debug_info_level == DINFO_LEVEL_NONE)
1364 debug_info_level = DINFO_LEVEL_NORMAL;
1366 if (write_symbols == NO_DEBUG)
1367 write_symbols = PREFERRED_DEBUGGING_TYPE;
1369 else
1370 debug_info_level = DINFO_LEVEL_NONE;
1373 if (flag_dump_final_insns && !flag_syntax_only && !no_backend)
1375 FILE *final_output = fopen (flag_dump_final_insns, "w");
1376 if (!final_output)
1378 error ("could not open final insn dump file %qs: %m",
1379 flag_dump_final_insns);
1380 flag_dump_final_insns = NULL;
1382 else if (fclose (final_output))
1384 error ("could not close zeroed insn dump file %qs: %m",
1385 flag_dump_final_insns);
1386 flag_dump_final_insns = NULL;
1390 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1391 level is 0. */
1392 if (debug_info_level == DINFO_LEVEL_NONE)
1393 write_symbols = NO_DEBUG;
1395 if (write_symbols == NO_DEBUG)
1397 #if defined(DBX_DEBUGGING_INFO)
1398 else if (write_symbols == DBX_DEBUG)
1399 debug_hooks = &dbx_debug_hooks;
1400 #endif
1401 #if defined(XCOFF_DEBUGGING_INFO)
1402 else if (write_symbols == XCOFF_DEBUG)
1403 debug_hooks = &xcoff_debug_hooks;
1404 #endif
1405 #ifdef SDB_DEBUGGING_INFO
1406 else if (write_symbols == SDB_DEBUG)
1407 debug_hooks = &sdb_debug_hooks;
1408 #endif
1409 #ifdef DWARF2_DEBUGGING_INFO
1410 else if (write_symbols == DWARF2_DEBUG)
1411 debug_hooks = &dwarf2_debug_hooks;
1412 #endif
1413 #ifdef VMS_DEBUGGING_INFO
1414 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1415 debug_hooks = &vmsdbg_debug_hooks;
1416 #endif
1417 else
1418 error ("target system does not support the \"%s\" debug format",
1419 debug_type_names[write_symbols]);
1421 /* We know which debug output will be used so we can set flag_var_tracking
1422 and flag_var_tracking_uninit if the user has not specified them. */
1423 if (debug_info_level < DINFO_LEVEL_NORMAL
1424 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
1426 if (flag_var_tracking == 1
1427 || flag_var_tracking_uninit == 1)
1429 if (debug_info_level < DINFO_LEVEL_NORMAL)
1430 warning (0, "variable tracking requested, but useless unless "
1431 "producing debug info");
1432 else
1433 warning (0, "variable tracking requested, but not supported "
1434 "by this debug format");
1436 flag_var_tracking = 0;
1437 flag_var_tracking_uninit = 0;
1440 /* The debug hooks are used to implement -fdump-go-spec because it
1441 gives a simple and stable API for all the information we need to
1442 dump. */
1443 if (flag_dump_go_spec != NULL)
1444 debug_hooks = dump_go_spec_init (flag_dump_go_spec, debug_hooks);
1446 /* If the user specifically requested variable tracking with tagging
1447 uninitialized variables, we need to turn on variable tracking.
1448 (We already determined above that variable tracking is feasible.) */
1449 if (flag_var_tracking_uninit == 1)
1450 flag_var_tracking = 1;
1452 if (flag_var_tracking == AUTODETECT_VALUE)
1453 flag_var_tracking = optimize >= 1;
1455 if (flag_var_tracking_uninit == AUTODETECT_VALUE)
1456 flag_var_tracking_uninit = flag_var_tracking;
1458 if (flag_var_tracking_assignments == AUTODETECT_VALUE)
1459 flag_var_tracking_assignments = flag_var_tracking
1460 && !(flag_selective_scheduling || flag_selective_scheduling2);
1462 if (flag_var_tracking_assignments_toggle)
1463 flag_var_tracking_assignments = !flag_var_tracking_assignments;
1465 if (flag_var_tracking_assignments && !flag_var_tracking)
1466 flag_var_tracking = flag_var_tracking_assignments = -1;
1468 if (flag_var_tracking_assignments
1469 && (flag_selective_scheduling || flag_selective_scheduling2))
1470 warning (0, "var-tracking-assignments changes selective scheduling");
1472 if (flag_tree_cselim == AUTODETECT_VALUE)
1473 #ifdef HAVE_conditional_move
1474 flag_tree_cselim = 1;
1475 #else
1476 flag_tree_cselim = 0;
1477 #endif
1479 /* If auxiliary info generation is desired, open the output file.
1480 This goes in the same directory as the source file--unlike
1481 all the other output files. */
1482 if (flag_gen_aux_info)
1484 aux_info_file = fopen (aux_info_file_name, "w");
1485 if (aux_info_file == 0)
1486 fatal_error ("can%'t open %s: %m", aux_info_file_name);
1489 if (!targetm_common.have_named_sections)
1491 if (flag_function_sections)
1493 warning (0, "-ffunction-sections not supported for this target");
1494 flag_function_sections = 0;
1496 if (flag_data_sections)
1498 warning (0, "-fdata-sections not supported for this target");
1499 flag_data_sections = 0;
1503 #ifndef HAVE_prefetch
1504 if (flag_prefetch_loop_arrays > 0)
1506 warning (0, "-fprefetch-loop-arrays not supported for this target");
1507 flag_prefetch_loop_arrays = 0;
1509 #else
1510 if (flag_prefetch_loop_arrays > 0 && !HAVE_prefetch)
1512 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1513 flag_prefetch_loop_arrays = 0;
1515 #endif
1517 /* This combination of options isn't handled for i386 targets and doesn't
1518 make much sense anyway, so don't allow it. */
1519 if (flag_prefetch_loop_arrays > 0 && optimize_size)
1521 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1522 flag_prefetch_loop_arrays = 0;
1525 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1526 if (flag_signaling_nans)
1527 flag_trapping_math = 1;
1529 /* We cannot reassociate if we want traps or signed zeros. */
1530 if (flag_associative_math && (flag_trapping_math || flag_signed_zeros))
1532 warning (0, "-fassociative-math disabled; other options take precedence");
1533 flag_associative_math = 0;
1536 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1537 if (flag_cx_limited_range)
1538 flag_complex_method = 0;
1540 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1541 if (flag_cx_fortran_rules)
1542 flag_complex_method = 1;
1544 /* Targets must be able to place spill slots at lower addresses. If the
1545 target already uses a soft frame pointer, the transition is trivial. */
1546 if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
1548 warning (0, "-fstack-protector not supported for this target");
1549 flag_stack_protect = 0;
1551 if (!flag_stack_protect)
1552 warn_stack_protect = 0;
1554 /* Address Sanitizer needs porting to each target architecture. */
1555 if ((flag_sanitize & SANITIZE_ADDRESS)
1556 && (targetm.asan_shadow_offset == NULL
1557 || !FRAME_GROWS_DOWNWARD))
1559 warning (0, "-fsanitize=address not supported for this target");
1560 flag_sanitize &= ~SANITIZE_ADDRESS;
1563 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1564 have not been set. */
1565 if (!global_options_set.x_warnings_are_errors
1566 && warn_coverage_mismatch
1567 && (global_dc->classify_diagnostic[OPT_Wcoverage_mismatch] ==
1568 DK_UNSPECIFIED))
1569 diagnostic_classify_diagnostic (global_dc, OPT_Wcoverage_mismatch,
1570 DK_ERROR, UNKNOWN_LOCATION);
1572 /* Save the current optimization options. */
1573 optimization_default_node = build_optimization_node (&global_options);
1574 optimization_current_node = optimization_default_node;
1577 /* This function can be called multiple times to reinitialize the compiler
1578 back end when register classes or instruction sets have changed,
1579 before each function. */
1580 static void
1581 backend_init_target (void)
1583 /* Initialize alignment variables. */
1584 init_alignments ();
1586 /* This depends on stack_pointer_rtx. */
1587 init_fake_stack_mems ();
1589 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1590 mode-dependent. */
1591 init_alias_target ();
1593 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1594 init_reload ();
1596 /* Depends on the enabled attribute. */
1597 recog_init ();
1599 /* The following initialization functions need to generate rtl, so
1600 provide a dummy function context for them. */
1601 init_dummy_function_start ();
1603 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1604 on a mode change. */
1605 init_expmed ();
1606 init_lower_subreg ();
1608 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1609 after a mode change as well. */
1610 caller_save_initialized_p = false;
1612 expand_dummy_function_end ();
1615 /* Initialize the compiler back end. This function is called only once,
1616 when starting the compiler. */
1617 static void
1618 backend_init (void)
1620 init_emit_once ();
1622 init_rtlanal ();
1623 init_inline_once ();
1624 init_varasm_once ();
1625 save_register_info ();
1627 /* Middle end needs this initialization for default mem attributes
1628 used by early calls to make_decl_rtl. */
1629 init_emit_regs ();
1631 /* Middle end needs this initialization for mode tables used to assign
1632 modes to vector variables. */
1633 init_regs ();
1636 /* Initialize excess precision settings. */
1637 static void
1638 init_excess_precision (void)
1640 /* Adjust excess precision handling based on the target options. If
1641 the front end cannot handle it, flag_excess_precision_cmdline
1642 will already have been set accordingly in the post_options
1643 hook. */
1644 gcc_assert (flag_excess_precision_cmdline != EXCESS_PRECISION_DEFAULT);
1645 flag_excess_precision = flag_excess_precision_cmdline;
1646 if (flag_unsafe_math_optimizations)
1647 flag_excess_precision = EXCESS_PRECISION_FAST;
1648 if (flag_excess_precision == EXCESS_PRECISION_STANDARD)
1650 int flt_eval_method = TARGET_FLT_EVAL_METHOD;
1651 switch (flt_eval_method)
1653 case -1:
1654 case 0:
1655 /* Either the target acts unpredictably (-1) or has all the
1656 operations required not to have excess precision (0). */
1657 flag_excess_precision = EXCESS_PRECISION_FAST;
1658 break;
1659 case 1:
1660 case 2:
1661 /* In these cases, predictable excess precision makes
1662 sense. */
1663 break;
1664 default:
1665 /* Any other implementation-defined FLT_EVAL_METHOD values
1666 require the compiler to handle the associated excess
1667 precision rules in excess_precision_type. */
1668 gcc_unreachable ();
1673 /* Initialize things that are both lang-dependent and target-dependent.
1674 This function can be called more than once if target parameters change. */
1675 static void
1676 lang_dependent_init_target (void)
1678 /* This determines excess precision settings. */
1679 init_excess_precision ();
1681 /* This creates various _DECL nodes, so needs to be called after the
1682 front end is initialized. It also depends on the HAVE_xxx macros
1683 generated from the target machine description. */
1684 init_optabs ();
1685 this_target_rtl->lang_dependent_initialized = false;
1688 /* Perform initializations that are lang-dependent or target-dependent.
1689 but matters only for late optimizations and RTL generation. */
1691 void
1692 initialize_rtl (void)
1694 static int initialized_once;
1696 /* Initialization done just once per compilation, but delayed
1697 till code generation. */
1698 if (!initialized_once)
1699 ira_init_once ();
1700 initialized_once = true;
1702 /* Target specific RTL backend initialization. */
1703 if (!this_target_rtl->target_specific_initialized)
1704 backend_init_target ();
1705 this_target_rtl->target_specific_initialized = true;
1707 if (this_target_rtl->lang_dependent_initialized)
1708 return;
1709 this_target_rtl->lang_dependent_initialized = true;
1711 /* The following initialization functions need to generate rtl, so
1712 provide a dummy function context for them. */
1713 init_dummy_function_start ();
1715 /* Do the target-specific parts of expr initialization. */
1716 init_expr_target ();
1718 /* Although the actions of these functions are language-independent,
1719 they use optabs, so we cannot call them from backend_init. */
1720 init_set_costs ();
1721 ira_init ();
1723 expand_dummy_function_end ();
1726 /* Language-dependent initialization. Returns nonzero on success. */
1727 static int
1728 lang_dependent_init (const char *name)
1730 location_t save_loc = input_location;
1731 if (dump_base_name == 0)
1732 dump_base_name = name && name[0] ? name : "gccdump";
1734 /* Other front-end initialization. */
1735 input_location = BUILTINS_LOCATION;
1736 if (lang_hooks.init () == 0)
1737 return 0;
1738 input_location = save_loc;
1740 if (!flag_wpa)
1742 init_asm_output (name);
1744 /* If stack usage information is desired, open the output file. */
1745 if (flag_stack_usage)
1746 stack_usage_file = open_auxiliary_file ("su");
1749 /* This creates various _DECL nodes, so needs to be called after the
1750 front end is initialized. */
1751 init_eh ();
1753 /* Do the target-specific parts of the initialization. */
1754 lang_dependent_init_target ();
1756 if (!flag_wpa)
1758 /* If dbx symbol table desired, initialize writing it and output the
1759 predefined types. */
1760 timevar_push (TV_SYMOUT);
1762 /* Now we have the correct original filename, we can initialize
1763 debug output. */
1764 (*debug_hooks->init) (name);
1766 timevar_pop (TV_SYMOUT);
1769 return 1;
1773 /* Reinitialize everything when target parameters, such as register usage,
1774 have changed. */
1775 void
1776 target_reinit (void)
1778 struct rtl_data saved_x_rtl;
1779 rtx *saved_regno_reg_rtx;
1780 tree saved_optimization_current_node;
1781 struct target_optabs *saved_this_fn_optabs;
1783 /* Temporarily switch to the default optimization node, so that
1784 *this_target_optabs is set to the default, not reflecting
1785 whatever a previous function used for the optimize
1786 attribute. */
1787 saved_optimization_current_node = optimization_current_node;
1788 saved_this_fn_optabs = this_fn_optabs;
1789 if (saved_optimization_current_node != optimization_default_node)
1791 optimization_current_node = optimization_default_node;
1792 cl_optimization_restore
1793 (&global_options,
1794 TREE_OPTIMIZATION (optimization_default_node));
1796 this_fn_optabs = this_target_optabs;
1798 /* Save *crtl and regno_reg_rtx around the reinitialization
1799 to allow target_reinit being called even after prepare_function_start. */
1800 saved_regno_reg_rtx = regno_reg_rtx;
1801 if (saved_regno_reg_rtx)
1803 saved_x_rtl = *crtl;
1804 memset (crtl, '\0', sizeof (*crtl));
1805 regno_reg_rtx = NULL;
1808 this_target_rtl->target_specific_initialized = false;
1810 /* This initializes hard_frame_pointer, and calls init_reg_modes_target()
1811 to initialize reg_raw_mode[]. */
1812 init_emit_regs ();
1814 /* This invokes target hooks to set fixed_reg[] etc, which is
1815 mode-dependent. */
1816 init_regs ();
1818 /* Reinitialize lang-dependent parts. */
1819 lang_dependent_init_target ();
1821 /* Restore the original optimization node. */
1822 if (saved_optimization_current_node != optimization_default_node)
1824 optimization_current_node = saved_optimization_current_node;
1825 cl_optimization_restore (&global_options,
1826 TREE_OPTIMIZATION (optimization_current_node));
1828 this_fn_optabs = saved_this_fn_optabs;
1830 /* Restore regno_reg_rtx at the end, as free_after_compilation from
1831 expand_dummy_function_end clears it. */
1832 if (saved_regno_reg_rtx)
1834 *crtl = saved_x_rtl;
1835 regno_reg_rtx = saved_regno_reg_rtx;
1836 saved_regno_reg_rtx = NULL;
1840 void
1841 dump_memory_report (bool final)
1843 dump_line_table_statistics ();
1844 ggc_print_statistics ();
1845 stringpool_statistics ();
1846 dump_tree_statistics ();
1847 dump_gimple_statistics ();
1848 dump_rtx_statistics ();
1849 dump_alloc_pool_statistics ();
1850 dump_bitmap_statistics ();
1851 dump_vec_loc_statistics ();
1852 dump_ggc_loc_statistics (final);
1853 dump_alias_stats (stderr);
1854 dump_pta_stats (stderr);
1857 /* Clean up: close opened files, etc. */
1859 static void
1860 finalize (bool no_backend)
1862 /* Close the dump files. */
1863 if (flag_gen_aux_info)
1865 fclose (aux_info_file);
1866 if (seen_error ())
1867 unlink (aux_info_file_name);
1870 /* Close non-debugging input and output files. Take special care to note
1871 whether fclose returns an error, since the pages might still be on the
1872 buffer chain while the file is open. */
1874 if (asm_out_file)
1876 if (ferror (asm_out_file) != 0)
1877 fatal_error ("error writing to %s: %m", asm_file_name);
1878 if (fclose (asm_out_file) != 0)
1879 fatal_error ("error closing %s: %m", asm_file_name);
1882 if (stack_usage_file)
1883 fclose (stack_usage_file);
1885 if (!no_backend)
1887 statistics_fini ();
1889 g->get_passes ()->finish_optimization_passes ();
1891 ira_finish_once ();
1894 if (mem_report)
1895 dump_memory_report (true);
1897 if (profile_report)
1898 dump_profile_report ();
1900 /* Language-specific end of compilation actions. */
1901 lang_hooks.finish ();
1904 /* Initialize the compiler, and compile the input file. */
1905 static void
1906 do_compile (void)
1908 /* Initialize timing first. The C front ends read the main file in
1909 the post_options hook, and C++ does file timings. */
1910 if (time_report || !quiet_flag || flag_detailed_statistics)
1911 timevar_init ();
1912 timevar_start (TV_TOTAL);
1914 process_options ();
1916 /* Don't do any more if an error has already occurred. */
1917 if (!seen_error ())
1919 timevar_start (TV_PHASE_SETUP);
1921 /* This must be run always, because it is needed to compute the FP
1922 predefined macros, such as __LDBL_MAX__, for targets using non
1923 default FP formats. */
1924 init_adjust_machine_modes ();
1925 init_derived_machine_modes ();
1927 /* Set up the back-end if requested. */
1928 if (!no_backend)
1929 backend_init ();
1931 /* Language-dependent initialization. Returns true on success. */
1932 if (lang_dependent_init (main_input_filename))
1934 /* Initialize yet another pass. */
1936 ggc_protect_identifiers = true;
1938 init_cgraph ();
1939 init_final (main_input_filename);
1940 coverage_init (aux_base_name);
1941 statistics_init ();
1942 invoke_plugin_callbacks (PLUGIN_START_UNIT, NULL);
1944 timevar_stop (TV_PHASE_SETUP);
1946 compile_file ();
1948 else
1950 timevar_stop (TV_PHASE_SETUP);
1953 timevar_start (TV_PHASE_FINALIZE);
1955 finalize (no_backend);
1957 timevar_stop (TV_PHASE_FINALIZE);
1960 /* Stop timing and print the times. */
1961 timevar_stop (TV_TOTAL);
1962 timevar_print (stderr);
1965 /* Entry point of cc1, cc1plus, jc1, f771, etc.
1966 Exit code is FATAL_EXIT_CODE if can't open files or if there were
1967 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
1969 It is not safe to call this function more than once. */
1972 toplev_main (int argc, char **argv)
1974 /* Parsing and gimplification sometimes need quite large stack.
1975 Increase stack size limits if possible. */
1976 stack_limit_increase (64 * 1024 * 1024);
1978 expandargv (&argc, &argv);
1980 /* Initialization of GCC's environment, and diagnostics. */
1981 general_init (argv[0]);
1983 /* One-off initialization of options that does not need to be
1984 repeated when options are added for particular functions. */
1985 init_options_once ();
1987 /* Initialize global options structures; this must be repeated for
1988 each structure used for parsing options. */
1989 init_options_struct (&global_options, &global_options_set);
1990 lang_hooks.init_options_struct (&global_options);
1992 /* Convert the options to an array. */
1993 decode_cmdline_options_to_array_default_mask (argc,
1994 CONST_CAST2 (const char **,
1995 char **, argv),
1996 &save_decoded_options,
1997 &save_decoded_options_count);
1999 /* Perform language-specific options initialization. */
2000 lang_hooks.init_options (save_decoded_options_count, save_decoded_options);
2002 /* Parse the options and do minimal processing; basically just
2003 enough to default flags appropriately. */
2004 decode_options (&global_options, &global_options_set,
2005 save_decoded_options, save_decoded_options_count,
2006 UNKNOWN_LOCATION, global_dc);
2008 handle_common_deferred_options ();
2010 init_local_tick ();
2012 initialize_plugins ();
2014 if (version_flag)
2015 print_version (stderr, "");
2017 if (help_flag)
2018 print_plugins_help (stderr, "");
2020 /* Exit early if we can (e.g. -help). */
2021 if (!exit_after_options)
2022 do_compile ();
2024 if (warningcount || errorcount || werrorcount)
2025 print_ignored_options ();
2027 /* Invoke registered plugin callbacks if any. Some plugins could
2028 emit some diagnostics here. */
2029 invoke_plugin_callbacks (PLUGIN_FINISH, NULL);
2031 diagnostic_finish (global_dc);
2033 finalize_plugins ();
2034 location_adhoc_data_fini (line_table);
2035 if (seen_error () || werrorcount)
2036 return (FATAL_EXIT_CODE);
2038 return (SUCCESS_EXIT_CODE);