2012-09-15 Tom de Vries <tom@codesourcery.com>
[official-gcc.git] / gcc / toplev.c
blobea43298ee70766f833734b4bbb3a8fd8152c0fff
1 /* Top level of GCC compilers (cc1, cc1plus, etc.)
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
4 2011 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
11 version.
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
27 #include "config.h"
28 #include "system.h"
29 #include "coretypes.h"
30 #include "tm.h"
31 #include "line-map.h"
32 #include "input.h"
33 #include "tree.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 "basic-block.h"
50 #include "intl.h"
51 #include "ggc.h"
52 #include "graph.h"
53 #include "regs.h"
54 #include "timevar.h"
55 #include "diagnostic.h"
56 #include "tree-diagnostic.h"
57 #include "tree-pretty-print.h"
58 #include "params.h"
59 #include "reload.h"
60 #include "ira.h"
61 #include "dwarf2asm.h"
62 #include "debug.h"
63 #include "target.h"
64 #include "common/common-target.h"
65 #include "langhooks.h"
66 #include "cfgloop.h" /* for init_set_costs */
67 #include "hosthooks.h"
68 #include "cgraph.h"
69 #include "opts.h"
70 #include "opts-diagnostic.h"
71 #include "coverage.h"
72 #include "value-prof.h"
73 #include "alloc-pool.h"
74 #include "tree-mudflap.h"
75 #include "gimple.h"
76 #include "tree-ssa-alias.h"
77 #include "plugin.h"
79 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
80 #include "dbxout.h"
81 #endif
83 #ifdef SDB_DEBUGGING_INFO
84 #include "sdbout.h"
85 #endif
87 #ifdef XCOFF_DEBUGGING_INFO
88 #include "xcoffout.h" /* Needed for external data
89 declarations for e.g. AIX 4.x. */
90 #endif
92 static void general_init (const char *);
93 static void do_compile (void);
94 static void process_options (void);
95 static void backend_init (void);
96 static int lang_dependent_init (const char *);
97 static void init_asm_output (const char *);
98 static void finalize (bool);
100 static void crash_signal (int) ATTRIBUTE_NORETURN;
101 static void compile_file (void);
103 /* True if we don't need a backend (e.g. preprocessing only). */
104 static bool no_backend;
106 /* Length of line when printing switch values. */
107 #define MAX_LINE 75
109 /* Decoded options, and number of such options. */
110 struct cl_decoded_option *save_decoded_options;
111 unsigned int save_decoded_options_count;
113 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
114 to optimize in process_options (). */
115 #define AUTODETECT_VALUE 2
117 /* Debug hooks - dependent upon command line options. */
119 const struct gcc_debug_hooks *debug_hooks;
121 /* The FUNCTION_DECL for the function currently being compiled,
122 or 0 if between functions. */
123 tree current_function_decl;
125 /* Set to the FUNC_BEGIN label of the current function, or NULL
126 if none. */
127 const char * current_function_func_begin_label;
129 /* A random sequence of characters, unless overridden by user. */
130 static const char *flag_random_seed;
132 /* A local time stamp derived from the time of compilation. It will be
133 zero if the system cannot provide a time. It will be -1u, if the
134 user has specified a particular random seed. */
135 unsigned local_tick;
137 /* Random number for this compilation */
138 HOST_WIDE_INT random_seed;
140 /* -f flags. */
142 /* When non-NULL, indicates that whenever space is allocated on the
143 stack, the resulting stack pointer must not pass this
144 address---that is, for stacks that grow downward, the stack pointer
145 must always be greater than or equal to this address; for stacks
146 that grow upward, the stack pointer must be less than this address.
147 At present, the rtx may be either a REG or a SYMBOL_REF, although
148 the support provided depends on the backend. */
149 rtx stack_limit_rtx;
151 /* True if the user has tagged the function with the 'section'
152 attribute. */
154 bool user_defined_section_attribute = false;
156 struct target_flag_state default_target_flag_state;
157 #if SWITCHABLE_TARGET
158 struct target_flag_state *this_target_flag_state = &default_target_flag_state;
159 #else
160 #define this_target_flag_state (&default_target_flag_state)
161 #endif
163 /* The user symbol prefix after having resolved same. */
164 const char *user_label_prefix;
166 /* Output files for assembler code (real compiler output)
167 and debugging dumps. */
169 FILE *asm_out_file;
170 FILE *aux_info_file;
171 FILE *stack_usage_file = NULL;
172 FILE *dump_file = NULL;
173 const char *dump_file_name;
175 /* The current working directory of a translation. It's generally the
176 directory from which compilation was initiated, but a preprocessed
177 file may specify the original directory in which it was
178 created. */
180 static const char *src_pwd;
182 /* Initialize src_pwd with the given string, and return true. If it
183 was already initialized, return false. As a special case, it may
184 be called with a NULL argument to test whether src_pwd has NOT been
185 initialized yet. */
187 bool
188 set_src_pwd (const char *pwd)
190 if (src_pwd)
192 if (strcmp (src_pwd, pwd) == 0)
193 return true;
194 else
195 return false;
198 src_pwd = xstrdup (pwd);
199 return true;
202 /* Return the directory from which the translation unit was initiated,
203 in case set_src_pwd() was not called before to assign it a
204 different value. */
206 const char *
207 get_src_pwd (void)
209 if (! src_pwd)
211 src_pwd = getpwd ();
212 if (!src_pwd)
213 src_pwd = ".";
216 return src_pwd;
219 /* Called when the start of a function definition is parsed,
220 this function prints on stderr the name of the function. */
221 void
222 announce_function (tree decl)
224 if (!quiet_flag)
226 if (rtl_dump_and_exit)
227 fprintf (stderr, "%s ",
228 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl))));
229 else
230 fprintf (stderr, " %s",
231 identifier_to_locale (lang_hooks.decl_printable_name (decl, 2)));
232 fflush (stderr);
233 pp_needs_newline (global_dc->printer) = true;
234 diagnostic_set_last_function (global_dc, (diagnostic_info *) NULL);
238 /* Initialize local_tick with a random number or -1 if
239 flag_random_seed is set. */
241 static void
242 init_local_tick (void)
244 if (!flag_random_seed)
246 /* Try urandom first. Time of day is too likely to collide.
247 In case of any error we just use the local tick. */
249 int fd = open ("/dev/urandom", O_RDONLY);
250 if (fd >= 0)
252 read (fd, &random_seed, sizeof (random_seed));
253 close (fd);
256 /* Now get the tick anyways */
257 #ifdef HAVE_GETTIMEOFDAY
259 struct timeval tv;
261 gettimeofday (&tv, NULL);
262 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
264 #else
266 time_t now = time (NULL);
268 if (now != (time_t)-1)
269 local_tick = (unsigned) now;
271 #endif
273 else
274 local_tick = -1;
277 /* Set up a default flag_random_seed and local_tick, unless the user
278 already specified one. Must be called after init_local_tick. */
280 static void
281 init_random_seed (void)
283 if (flag_random_seed)
285 char *endp;
287 /* When the driver passed in a hex number don't crc it again */
288 random_seed = strtoul (flag_random_seed, &endp, 0);
289 if (!(endp > flag_random_seed && *endp == 0))
290 random_seed = crc32_string (0, flag_random_seed);
292 else if (!random_seed)
293 random_seed = local_tick ^ getpid (); /* Old racey fallback method */
296 /* Obtain the random_seed. Unless NOINIT, initialize it if
297 it's not provided in the command line. */
299 HOST_WIDE_INT
300 get_random_seed (bool noinit)
302 if (!flag_random_seed && !noinit)
303 init_random_seed ();
304 return random_seed;
307 /* Modify the random_seed string to VAL. Return its previous
308 value. */
310 const char *
311 set_random_seed (const char *val)
313 const char *old = flag_random_seed;
314 flag_random_seed = val;
315 return old;
318 /* Handler for fatal signals, such as SIGSEGV. These are transformed
319 into ICE messages, which is much more user friendly. In case the
320 error printer crashes, reset the signal to prevent infinite recursion. */
322 static void
323 crash_signal (int signo)
325 signal (signo, SIG_DFL);
327 /* If we crashed while processing an ASM statement, then be a little more
328 graceful. It's most likely the user's fault. */
329 if (this_is_asm_operands)
331 output_operand_lossage ("unrecoverable error");
332 exit (FATAL_EXIT_CODE);
335 internal_error ("%s", strsignal (signo));
338 /* A subroutine of wrapup_global_declarations. We've come to the end of
339 the compilation unit. All deferred variables should be undeferred,
340 and all incomplete decls should be finalized. */
342 void
343 wrapup_global_declaration_1 (tree decl)
345 /* We're not deferring this any longer. Assignment is conditional to
346 avoid needlessly dirtying PCH pages. */
347 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl), TS_DECL_WITH_VIS)
348 && DECL_DEFER_OUTPUT (decl) != 0)
349 DECL_DEFER_OUTPUT (decl) = 0;
351 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
352 lang_hooks.finish_incomplete_decl (decl);
355 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
356 needs to be output. Return true if it is output. */
358 bool
359 wrapup_global_declaration_2 (tree decl)
361 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl)
362 || (TREE_CODE (decl) == VAR_DECL && DECL_HAS_VALUE_EXPR_P (decl)))
363 return false;
365 /* Don't write out static consts, unless we still need them.
367 We also keep static consts if not optimizing (for debugging),
368 unless the user specified -fno-keep-static-consts.
369 ??? They might be better written into the debug information.
370 This is possible when using DWARF.
372 A language processor that wants static constants to be always
373 written out (even if it is not used) is responsible for
374 calling rest_of_decl_compilation itself. E.g. the C front-end
375 calls rest_of_decl_compilation from finish_decl.
376 One motivation for this is that is conventional in some
377 environments to write things like:
378 static const char rcsid[] = "... version string ...";
379 intending to force the string to be in the executable.
381 A language processor that would prefer to have unneeded
382 static constants "optimized away" would just defer writing
383 them out until here. E.g. C++ does this, because static
384 constants are often defined in header files.
386 ??? A tempting alternative (for both C and C++) would be
387 to force a constant to be written if and only if it is
388 defined in a main file, as opposed to an include file. */
390 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
392 struct varpool_node *node;
393 bool needed = true;
394 node = varpool_get_node (decl);
396 if (!node && flag_ltrans)
397 needed = false;
398 else if (node && node->finalized)
399 needed = false;
400 else if (node && node->alias)
401 needed = false;
402 else if (!cgraph_global_info_ready
403 && (TREE_USED (decl)
404 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
405 /* needed */;
406 else if (node && node->analyzed)
407 /* needed */;
408 else if (DECL_COMDAT (decl))
409 needed = false;
410 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
411 && (optimize || !flag_keep_static_consts
412 || DECL_ARTIFICIAL (decl)))
413 needed = false;
415 if (needed)
417 rest_of_decl_compilation (decl, 1, 1);
418 return true;
422 return false;
425 /* Do any final processing required for the declarations in VEC, of
426 which there are LEN. We write out inline functions and variables
427 that have been deferred until this point, but which are required.
428 Returns nonzero if anything was put out. */
430 bool
431 wrapup_global_declarations (tree *vec, int len)
433 bool reconsider, output_something = false;
434 int i;
436 for (i = 0; i < len; i++)
437 wrapup_global_declaration_1 (vec[i]);
439 /* Now emit any global variables or functions that we have been
440 putting off. We need to loop in case one of the things emitted
441 here references another one which comes earlier in the list. */
444 reconsider = false;
445 for (i = 0; i < len; i++)
446 reconsider |= wrapup_global_declaration_2 (vec[i]);
447 if (reconsider)
448 output_something = true;
450 while (reconsider);
452 return output_something;
455 /* A subroutine of check_global_declarations. Issue appropriate warnings
456 for the global declaration DECL. */
458 void
459 check_global_declaration_1 (tree decl)
461 /* Warn about any function declared static but not defined. We don't
462 warn about variables, because many programs have static variables
463 that exist only to get some text into the object file. */
464 if (TREE_CODE (decl) == FUNCTION_DECL
465 && DECL_INITIAL (decl) == 0
466 && DECL_EXTERNAL (decl)
467 && ! DECL_ARTIFICIAL (decl)
468 && ! TREE_NO_WARNING (decl)
469 && ! TREE_PUBLIC (decl)
470 && (warn_unused_function
471 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
473 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
474 pedwarn (input_location, 0, "%q+F used but never defined", decl);
475 else
476 warning (OPT_Wunused_function, "%q+F declared %<static%> but never defined", decl);
477 /* This symbol is effectively an "extern" declaration now. */
478 TREE_PUBLIC (decl) = 1;
481 /* Warn about static fns or vars defined but not used. */
482 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
483 /* We don't warn about "static const" variables because the
484 "rcs_id" idiom uses that construction. */
485 || (warn_unused_variable
486 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
487 && ! DECL_IN_SYSTEM_HEADER (decl)
488 && ! TREE_USED (decl)
489 /* The TREE_USED bit for file-scope decls is kept in the identifier,
490 to handle multiple external decls in different scopes. */
491 && ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl)))
492 && ! DECL_EXTERNAL (decl)
493 && ! TREE_PUBLIC (decl)
494 /* A volatile variable might be used in some non-obvious way. */
495 && ! TREE_THIS_VOLATILE (decl)
496 /* Global register variables must be declared to reserve them. */
497 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
498 /* Otherwise, ask the language. */
499 && lang_hooks.decls.warn_unused_global (decl))
500 warning ((TREE_CODE (decl) == FUNCTION_DECL)
501 ? OPT_Wunused_function
502 : OPT_Wunused_variable,
503 "%q+D defined but not used", decl);
506 /* Issue appropriate warnings for the global declarations in VEC (of
507 which there are LEN). */
509 void
510 check_global_declarations (tree *vec, int len)
512 int i;
514 for (i = 0; i < len; i++)
515 check_global_declaration_1 (vec[i]);
518 /* Emit debugging information for all global declarations in VEC. */
520 void
521 emit_debug_global_declarations (tree *vec, int len)
523 int i;
525 /* Avoid confusing the debug information machinery when there are errors. */
526 if (seen_error ())
527 return;
529 timevar_push (TV_SYMOUT);
530 for (i = 0; i < len; i++)
531 debug_hooks->global_decl (vec[i]);
532 timevar_pop (TV_SYMOUT);
535 /* Compile an entire translation unit. Write a file of assembly
536 output and various debugging dumps. */
538 static void
539 compile_file (void)
541 timevar_start (TV_PHASE_PARSING);
542 timevar_push (TV_PARSE_GLOBAL);
544 /* Call the parser, which parses the entire file (calling
545 rest_of_compilation for each function). */
546 lang_hooks.parse_file ();
548 timevar_pop (TV_PARSE_GLOBAL);
549 timevar_stop (TV_PHASE_PARSING);
551 /* Compilation is now finished except for writing
552 what's left of the symbol table output. */
554 if (flag_syntax_only || flag_wpa)
555 return;
557 ggc_protect_identifiers = false;
559 /* This must also call finalize_compilation_unit. */
560 lang_hooks.decls.final_write_globals ();
562 if (seen_error ())
563 return;
565 timevar_start (TV_PHASE_LATE_ASM);
567 /* Compilation unit is finalized. When producing non-fat LTO object, we are
568 basically finished. */
569 if (in_lto_p || !flag_lto || flag_fat_lto_objects)
571 /* Likewise for mudflap static object registrations. */
572 if (flag_mudflap)
573 mudflap_finish_file ();
575 output_shared_constant_pool ();
576 output_object_blocks ();
577 finish_tm_clone_pairs ();
579 /* Write out any pending weak symbol declarations. */
580 weak_finish ();
582 /* This must be at the end before unwind and debug info.
583 Some target ports emit PIC setup thunks here. */
584 targetm.asm_out.code_end ();
586 /* Do dbx symbols. */
587 timevar_push (TV_SYMOUT);
589 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
590 if (dwarf2out_do_frame ())
591 dwarf2out_frame_finish ();
592 #endif
594 (*debug_hooks->finish) (main_input_filename);
595 timevar_pop (TV_SYMOUT);
597 /* Output some stuff at end of file if nec. */
599 dw2_output_indirect_constants ();
601 /* Flush any pending external directives. */
602 process_pending_assemble_externals ();
605 /* Emit LTO marker if LTO info has been previously emitted. This is
606 used by collect2 to determine whether an object file contains IL.
607 We used to emit an undefined reference here, but this produces
608 link errors if an object file with IL is stored into a shared
609 library without invoking lto1. */
610 if (flag_generate_lto)
612 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
613 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
614 "__gnu_lto_v1",
615 (unsigned HOST_WIDE_INT) 1, 8);
616 #elif defined ASM_OUTPUT_ALIGNED_COMMON
617 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_v1",
618 (unsigned HOST_WIDE_INT) 1, 8);
619 #else
620 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_v1",
621 (unsigned HOST_WIDE_INT) 1,
622 (unsigned HOST_WIDE_INT) 1);
623 #endif
624 /* Let linker plugin know that this is a slim object and must be LTOed
625 even when user did not ask for it. */
626 if (!flag_fat_lto_objects)
628 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
629 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
630 "__gnu_lto_slim",
631 (unsigned HOST_WIDE_INT) 1, 8);
632 #elif defined ASM_OUTPUT_ALIGNED_COMMON
633 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_slim",
634 (unsigned HOST_WIDE_INT) 1, 8);
635 #else
636 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_slim",
637 (unsigned HOST_WIDE_INT) 1,
638 (unsigned HOST_WIDE_INT) 1);
639 #endif
643 /* Attach a special .ident directive to the end of the file to identify
644 the version of GCC which compiled this code. The format of the .ident
645 string is patterned after the ones produced by native SVR4 compilers. */
646 if (!flag_no_ident)
648 const char *pkg_version = "(GNU) ";
649 char *ident_str;
651 if (strcmp ("(GCC) ", pkgversion_string))
652 pkg_version = pkgversion_string;
654 ident_str = ACONCAT (("GCC: ", pkg_version, version_string, NULL));
655 targetm.asm_out.output_ident (ident_str);
658 /* Invoke registered plugin callbacks. */
659 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT, NULL);
661 /* This must be at the end. Some target ports emit end of file directives
662 into the assembly file here, and hence we can not output anything to the
663 assembly file after this point. */
664 targetm.asm_out.file_end ();
666 timevar_stop (TV_PHASE_LATE_ASM);
669 /* Print version information to FILE.
670 Each line begins with INDENT (for the case where FILE is the
671 assembler output file). */
673 void
674 print_version (FILE *file, const char *indent)
676 static const char fmt1[] =
677 #ifdef __GNUC__
678 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
679 #else
680 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
681 #endif
683 static const char fmt2[] =
684 N_("GMP version %s, MPFR version %s, MPC version %s\n");
685 static const char fmt3[] =
686 N_("%s%swarning: %s header version %s differs from library version %s.\n");
687 static const char fmt4[] =
688 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
689 #ifndef __VERSION__
690 #define __VERSION__ "[?]"
691 #endif
692 fprintf (file,
693 file == stderr ? _(fmt1) : fmt1,
694 indent, *indent != 0 ? " " : "",
695 lang_hooks.name, pkgversion_string, version_string, TARGET_NAME,
696 indent, __VERSION__);
698 /* We need to stringify the GMP macro values. Ugh, gmp_version has
699 two string formats, "i.j.k" and "i.j" when k is zero. As of
700 gmp-4.3.0, GMP always uses the 3 number format. */
701 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
702 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3(X)
703 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
704 #define GCC_GMP_VERSION \
705 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
706 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
707 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
708 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR)
709 #else
710 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
711 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) "." \
712 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_PATCHLEVEL)
713 #endif
714 fprintf (file,
715 file == stderr ? _(fmt2) : fmt2,
716 GCC_GMP_STRINGIFY_VERSION, MPFR_VERSION_STRING, MPC_VERSION_STRING);
717 if (strcmp (GCC_GMP_STRINGIFY_VERSION, gmp_version))
718 fprintf (file,
719 file == stderr ? _(fmt3) : fmt3,
720 indent, *indent != 0 ? " " : "",
721 "GMP", GCC_GMP_STRINGIFY_VERSION, gmp_version);
722 if (strcmp (MPFR_VERSION_STRING, mpfr_get_version ()))
723 fprintf (file,
724 file == stderr ? _(fmt3) : fmt3,
725 indent, *indent != 0 ? " " : "",
726 "MPFR", MPFR_VERSION_STRING, mpfr_get_version ());
727 if (strcmp (MPC_VERSION_STRING, mpc_get_version ()))
728 fprintf (file,
729 file == stderr ? _(fmt3) : fmt3,
730 indent, *indent != 0 ? " " : "",
731 "MPC", MPC_VERSION_STRING, mpc_get_version ());
732 fprintf (file,
733 file == stderr ? _(fmt4) : fmt4,
734 indent, *indent != 0 ? " " : "",
735 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
737 print_plugins_versions (file, indent);
740 static int
741 print_to_asm_out_file (print_switch_type type, const char * text)
743 bool prepend_sep = true;
745 switch (type)
747 case SWITCH_TYPE_LINE_END:
748 putc ('\n', asm_out_file);
749 return 1;
751 case SWITCH_TYPE_LINE_START:
752 fputs (ASM_COMMENT_START, asm_out_file);
753 return strlen (ASM_COMMENT_START);
755 case SWITCH_TYPE_DESCRIPTIVE:
756 if (ASM_COMMENT_START[0] == 0)
757 prepend_sep = false;
758 /* Drop through. */
759 case SWITCH_TYPE_PASSED:
760 case SWITCH_TYPE_ENABLED:
761 if (prepend_sep)
762 fputc (' ', asm_out_file);
763 fputs (text, asm_out_file);
764 /* No need to return the length here as
765 print_single_switch has already done it. */
766 return 0;
768 default:
769 return -1;
773 static int
774 print_to_stderr (print_switch_type type, const char * text)
776 switch (type)
778 case SWITCH_TYPE_LINE_END:
779 putc ('\n', stderr);
780 return 1;
782 case SWITCH_TYPE_LINE_START:
783 return 0;
785 case SWITCH_TYPE_PASSED:
786 case SWITCH_TYPE_ENABLED:
787 fputc (' ', stderr);
788 /* Drop through. */
790 case SWITCH_TYPE_DESCRIPTIVE:
791 fputs (text, stderr);
792 /* No need to return the length here as
793 print_single_switch has already done it. */
794 return 0;
796 default:
797 return -1;
801 /* Print an option value and return the adjusted position in the line.
802 ??? print_fn doesn't handle errors, eg disk full; presumably other
803 code will catch a disk full though. */
805 static int
806 print_single_switch (print_switch_fn_type print_fn,
807 int pos,
808 print_switch_type type,
809 const char * text)
811 /* The ultrix fprintf returns 0 on success, so compute the result
812 we want here since we need it for the following test. The +1
813 is for the separator character that will probably be emitted. */
814 int len = strlen (text) + 1;
816 if (pos != 0
817 && pos + len > MAX_LINE)
819 print_fn (SWITCH_TYPE_LINE_END, NULL);
820 pos = 0;
823 if (pos == 0)
824 pos += print_fn (SWITCH_TYPE_LINE_START, NULL);
826 print_fn (type, text);
827 return pos + len;
830 /* Print active target switches using PRINT_FN.
831 POS is the current cursor position and MAX is the size of a "line".
832 Each line begins with INDENT and ends with TERM.
833 Each switch is separated from the next by SEP. */
835 static void
836 print_switch_values (print_switch_fn_type print_fn)
838 int pos = 0;
839 size_t j;
841 /* Fill in the -frandom-seed option, if the user didn't pass it, so
842 that it can be printed below. This helps reproducibility. */
843 if (!flag_random_seed)
844 init_random_seed ();
846 /* Print the options as passed. */
847 pos = print_single_switch (print_fn, pos,
848 SWITCH_TYPE_DESCRIPTIVE, _("options passed: "));
850 for (j = 1; j < save_decoded_options_count; j++)
852 switch (save_decoded_options[j].opt_index)
854 case OPT_o:
855 case OPT_d:
856 case OPT_dumpbase:
857 case OPT_dumpdir:
858 case OPT_auxbase:
859 case OPT_quiet:
860 case OPT_version:
861 /* Ignore these. */
862 continue;
865 pos = print_single_switch (print_fn, pos, SWITCH_TYPE_PASSED,
866 save_decoded_options[j].orig_option_with_args_text);
869 if (pos > 0)
870 print_fn (SWITCH_TYPE_LINE_END, NULL);
872 /* Print the -f and -m options that have been enabled.
873 We don't handle language specific options but printing argv
874 should suffice. */
875 pos = print_single_switch (print_fn, 0,
876 SWITCH_TYPE_DESCRIPTIVE, _("options enabled: "));
878 for (j = 0; j < cl_options_count; j++)
879 if (cl_options[j].cl_report
880 && option_enabled (j, &global_options) > 0)
881 pos = print_single_switch (print_fn, pos,
882 SWITCH_TYPE_ENABLED, cl_options[j].opt_text);
884 print_fn (SWITCH_TYPE_LINE_END, NULL);
887 /* Open assembly code output file. Do this even if -fsyntax-only is
888 on, because then the driver will have provided the name of a
889 temporary file or bit bucket for us. NAME is the file specified on
890 the command line, possibly NULL. */
891 static void
892 init_asm_output (const char *name)
894 if (name == NULL && asm_file_name == 0)
895 asm_out_file = stdout;
896 else
898 if (asm_file_name == 0)
900 int len = strlen (dump_base_name);
901 char *dumpname = XNEWVEC (char, len + 6);
903 memcpy (dumpname, dump_base_name, len + 1);
904 strip_off_ending (dumpname, len);
905 strcat (dumpname, ".s");
906 asm_file_name = dumpname;
908 if (!strcmp (asm_file_name, "-"))
909 asm_out_file = stdout;
910 else
911 asm_out_file = fopen (asm_file_name, "w");
912 if (asm_out_file == 0)
913 fatal_error ("can%'t open %s for writing: %m", asm_file_name);
916 if (!flag_syntax_only)
918 targetm.asm_out.file_start ();
920 if (flag_record_gcc_switches)
922 if (targetm.asm_out.record_gcc_switches)
924 /* Let the target know that we are about to start recording. */
925 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
926 NULL);
927 /* Now record the switches. */
928 print_switch_values (targetm.asm_out.record_gcc_switches);
929 /* Let the target know that the recording is over. */
930 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
931 NULL);
933 else
934 inform (input_location, "-frecord-gcc-switches is not supported by the current target");
937 if (flag_verbose_asm)
939 /* Print the list of switches in effect
940 into the assembler file as comments. */
941 print_version (asm_out_file, ASM_COMMENT_START);
942 print_switch_values (print_to_asm_out_file);
943 putc ('\n', asm_out_file);
948 /* A helper function; used as the reallocator function for cpp's line
949 table. */
950 static void *
951 realloc_for_line_map (void *ptr, size_t len)
953 return GGC_RESIZEVAR (void, ptr, len);
956 /* A helper function: used as the allocator function for
957 identifier_to_locale. */
958 static void *
959 alloc_for_identifier_to_locale (size_t len)
961 return ggc_alloc_atomic (len);
964 /* Output stack usage information. */
965 void
966 output_stack_usage (void)
968 static bool warning_issued = false;
969 enum stack_usage_kind_type { STATIC = 0, DYNAMIC, DYNAMIC_BOUNDED };
970 const char *stack_usage_kind_str[] = {
971 "static",
972 "dynamic",
973 "dynamic,bounded"
975 HOST_WIDE_INT stack_usage = current_function_static_stack_size;
976 enum stack_usage_kind_type stack_usage_kind;
978 if (stack_usage < 0)
980 if (!warning_issued)
982 warning (0, "stack usage computation not supported for this target");
983 warning_issued = true;
985 return;
988 stack_usage_kind = STATIC;
990 /* Add the maximum amount of space pushed onto the stack. */
991 if (current_function_pushed_stack_size > 0)
993 stack_usage += current_function_pushed_stack_size;
994 stack_usage_kind = DYNAMIC_BOUNDED;
997 /* Now on to the tricky part: dynamic stack allocation. */
998 if (current_function_allocates_dynamic_stack_space)
1000 if (current_function_has_unbounded_dynamic_stack_size)
1001 stack_usage_kind = DYNAMIC;
1002 else
1003 stack_usage_kind = DYNAMIC_BOUNDED;
1005 /* Add the size even in the unbounded case, this can't hurt. */
1006 stack_usage += current_function_dynamic_stack_size;
1009 if (flag_stack_usage)
1011 expanded_location loc
1012 = expand_location (DECL_SOURCE_LOCATION (current_function_decl));
1013 const char *raw_id, *id;
1015 /* Strip the scope prefix if any. */
1016 raw_id = lang_hooks.decl_printable_name (current_function_decl, 2);
1017 id = strrchr (raw_id, '.');
1018 if (id)
1019 id++;
1020 else
1021 id = raw_id;
1023 fprintf (stack_usage_file,
1024 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC"\t%s\n",
1025 lbasename (loc.file),
1026 loc.line,
1027 loc.column,
1029 stack_usage,
1030 stack_usage_kind_str[stack_usage_kind]);
1033 if (warn_stack_usage >= 0)
1035 if (stack_usage_kind == DYNAMIC)
1036 warning (OPT_Wstack_usage_, "stack usage might be unbounded");
1037 else if (stack_usage > warn_stack_usage)
1039 if (stack_usage_kind == DYNAMIC_BOUNDED)
1040 warning (OPT_Wstack_usage_, "stack usage might be %wd bytes",
1041 stack_usage);
1042 else
1043 warning (OPT_Wstack_usage_, "stack usage is %wd bytes",
1044 stack_usage);
1049 /* Open an auxiliary output file. */
1050 static FILE *
1051 open_auxiliary_file (const char *ext)
1053 char *filename;
1054 FILE *file;
1056 filename = concat (aux_base_name, ".", ext, NULL);
1057 file = fopen (filename, "w");
1058 if (!file)
1059 fatal_error ("can%'t open %s for writing: %m", filename);
1060 free (filename);
1061 return file;
1064 /* Initialization of the front end environment, before command line
1065 options are parsed. Signal handlers, internationalization etc.
1066 ARGV0 is main's argv[0]. */
1067 static void
1068 general_init (const char *argv0)
1070 const char *p;
1072 p = argv0 + strlen (argv0);
1073 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1074 --p;
1075 progname = p;
1077 xmalloc_set_program_name (progname);
1079 hex_init ();
1081 /* Unlock the stdio streams. */
1082 unlock_std_streams ();
1084 gcc_init_libintl ();
1086 identifier_to_locale_alloc = alloc_for_identifier_to_locale;
1087 identifier_to_locale_free = ggc_free;
1089 /* Initialize the diagnostics reporting machinery, so option parsing
1090 can give warnings and errors. */
1091 diagnostic_initialize (global_dc, N_OPTS);
1092 /* Set a default printer. Language specific initializations will
1093 override it later. */
1094 tree_diagnostics_defaults (global_dc);
1095 /* FIXME: This should probably be moved to C-family
1096 language-specific initializations. */
1097 /* By default print macro expansion contexts in the diagnostic
1098 finalizer -- for tokens resulting from macro expansion. */
1099 diagnostic_finalizer (global_dc) = virt_loc_aware_diagnostic_finalizer;
1101 global_dc->show_caret
1102 = global_options_init.x_flag_diagnostics_show_caret;
1103 global_dc->show_option_requested
1104 = global_options_init.x_flag_diagnostics_show_option;
1105 global_dc->show_column
1106 = global_options_init.x_flag_show_column;
1107 global_dc->internal_error = plugins_internal_error_function;
1108 global_dc->option_enabled = option_enabled;
1109 global_dc->option_state = &global_options;
1110 global_dc->option_name = option_name;
1112 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1113 #ifdef SIGSEGV
1114 signal (SIGSEGV, crash_signal);
1115 #endif
1116 #ifdef SIGILL
1117 signal (SIGILL, crash_signal);
1118 #endif
1119 #ifdef SIGBUS
1120 signal (SIGBUS, crash_signal);
1121 #endif
1122 #ifdef SIGABRT
1123 signal (SIGABRT, crash_signal);
1124 #endif
1125 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1126 signal (SIGIOT, crash_signal);
1127 #endif
1128 #ifdef SIGFPE
1129 signal (SIGFPE, crash_signal);
1130 #endif
1132 /* Other host-specific signal setup. */
1133 (*host_hooks.extra_signals)();
1135 /* Initialize the garbage-collector, string pools and tree type hash
1136 table. */
1137 init_ggc ();
1138 init_stringpool ();
1139 line_table = ggc_alloc_line_maps ();
1140 linemap_init (line_table);
1141 line_table->reallocator = realloc_for_line_map;
1142 line_table->round_alloc_size = ggc_round_alloc_size;
1143 init_ttree ();
1145 /* Initialize register usage now so switches may override. */
1146 init_reg_sets ();
1148 /* Register the language-independent parameters. */
1149 global_init_params ();
1151 /* This must be done after global_init_params but before argument
1152 processing. */
1153 init_ggc_heuristics();
1154 init_optimization_passes ();
1155 statistics_early_init ();
1156 finish_params ();
1159 /* Return true if the current target supports -fsection-anchors. */
1161 static bool
1162 target_supports_section_anchors_p (void)
1164 if (targetm.min_anchor_offset == 0 && targetm.max_anchor_offset == 0)
1165 return false;
1167 if (targetm.asm_out.output_anchor == NULL)
1168 return false;
1170 return true;
1173 /* Default the align_* variables to 1 if they're still unset, and
1174 set up the align_*_log variables. */
1175 static void
1176 init_alignments (void)
1178 if (align_loops <= 0)
1179 align_loops = 1;
1180 if (align_loops_max_skip > align_loops)
1181 align_loops_max_skip = align_loops - 1;
1182 align_loops_log = floor_log2 (align_loops * 2 - 1);
1183 if (align_jumps <= 0)
1184 align_jumps = 1;
1185 if (align_jumps_max_skip > align_jumps)
1186 align_jumps_max_skip = align_jumps - 1;
1187 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1188 if (align_labels <= 0)
1189 align_labels = 1;
1190 align_labels_log = floor_log2 (align_labels * 2 - 1);
1191 if (align_labels_max_skip > align_labels)
1192 align_labels_max_skip = align_labels - 1;
1193 if (align_functions <= 0)
1194 align_functions = 1;
1195 align_functions_log = floor_log2 (align_functions * 2 - 1);
1198 /* Process the options that have been parsed. */
1199 static void
1200 process_options (void)
1202 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1203 This can happen with incorrect pre-processed input. */
1204 debug_hooks = &do_nothing_debug_hooks;
1206 maximum_field_alignment = initial_max_fld_align * BITS_PER_UNIT;
1208 /* Allow the front end to perform consistency checks and do further
1209 initialization based on the command line options. This hook also
1210 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1211 so we can correctly initialize debug output. */
1212 no_backend = lang_hooks.post_options (&main_input_filename);
1214 /* Some machines may reject certain combinations of options. */
1215 targetm.target_option.override ();
1217 /* Avoid any informative notes in the second run of -fcompare-debug. */
1218 if (flag_compare_debug)
1219 diagnostic_inhibit_notes (global_dc);
1221 if (flag_section_anchors && !target_supports_section_anchors_p ())
1223 warning (OPT_fsection_anchors,
1224 "this target does not support %qs", "-fsection-anchors");
1225 flag_section_anchors = 0;
1228 if (flag_short_enums == 2)
1229 flag_short_enums = targetm.default_short_enums ();
1231 /* Set aux_base_name if not already set. */
1232 if (aux_base_name)
1234 else if (main_input_filename)
1236 char *name = xstrdup (lbasename (main_input_filename));
1238 strip_off_ending (name, strlen (name));
1239 aux_base_name = name;
1241 else
1242 aux_base_name = "gccaux";
1244 #ifndef HAVE_cloog
1245 if (flag_graphite
1246 || flag_graphite_identity
1247 || flag_loop_block
1248 || flag_loop_interchange
1249 || flag_loop_strip_mine
1250 || flag_loop_parallelize_all)
1251 sorry ("Graphite loop optimizations cannot be used (-fgraphite, "
1252 "-fgraphite-identity, -floop-block, "
1253 "-floop-interchange, -floop-strip-mine, -floop-parallelize-all, "
1254 "and -ftree-loop-linear)");
1255 #endif
1257 if (flag_mudflap && flag_lto)
1258 sorry ("mudflap cannot be used together with link-time optimization");
1260 /* One region RA really helps to decrease the code size. */
1261 if (flag_ira_region == IRA_REGION_AUTODETECT)
1262 flag_ira_region
1263 = optimize_size || !optimize ? IRA_REGION_ONE : IRA_REGION_MIXED;
1265 if (flag_strict_volatile_bitfields > 0 && !abi_version_at_least (2))
1267 warning (0, "-fstrict-volatile-bitfields disabled; "
1268 "it is incompatible with ABI versions < 2");
1269 flag_strict_volatile_bitfields = 0;
1272 /* Unrolling all loops implies that standard loop unrolling must also
1273 be done. */
1274 if (flag_unroll_all_loops)
1275 flag_unroll_loops = 1;
1277 /* web and rename-registers help when run after loop unrolling. */
1278 if (flag_web == AUTODETECT_VALUE)
1279 flag_web = flag_unroll_loops || flag_peel_loops;
1281 if (flag_rename_registers == AUTODETECT_VALUE)
1282 flag_rename_registers = flag_unroll_loops || flag_peel_loops;
1284 if (flag_non_call_exceptions)
1285 flag_asynchronous_unwind_tables = 1;
1286 if (flag_asynchronous_unwind_tables)
1287 flag_unwind_tables = 1;
1289 if (flag_value_profile_transformations)
1290 flag_profile_values = 1;
1292 /* Warn about options that are not supported on this machine. */
1293 #ifndef INSN_SCHEDULING
1294 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1295 warning (0, "instruction scheduling not supported on this target machine");
1296 #endif
1297 #ifndef DELAY_SLOTS
1298 if (flag_delayed_branch)
1299 warning (0, "this target machine does not have delayed branches");
1300 #endif
1302 user_label_prefix = USER_LABEL_PREFIX;
1303 if (flag_leading_underscore != -1)
1305 /* If the default prefix is more complicated than "" or "_",
1306 issue a warning and ignore this option. */
1307 if (user_label_prefix[0] == 0 ||
1308 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1310 user_label_prefix = flag_leading_underscore ? "_" : "";
1312 else
1313 warning (0, "-f%sleading-underscore not supported on this target machine",
1314 flag_leading_underscore ? "" : "no-");
1317 /* If we are in verbose mode, write out the version and maybe all the
1318 option flags in use. */
1319 if (version_flag)
1321 print_version (stderr, "");
1322 if (! quiet_flag)
1323 print_switch_values (print_to_stderr);
1326 if (flag_syntax_only)
1328 write_symbols = NO_DEBUG;
1329 profile_flag = 0;
1332 if (flag_gtoggle)
1334 if (debug_info_level == DINFO_LEVEL_NONE)
1336 debug_info_level = DINFO_LEVEL_NORMAL;
1338 if (write_symbols == NO_DEBUG)
1339 write_symbols = PREFERRED_DEBUGGING_TYPE;
1341 else
1342 debug_info_level = DINFO_LEVEL_NONE;
1345 if (flag_dump_final_insns && !flag_syntax_only && !no_backend)
1347 FILE *final_output = fopen (flag_dump_final_insns, "w");
1348 if (!final_output)
1350 error ("could not open final insn dump file %qs: %m",
1351 flag_dump_final_insns);
1352 flag_dump_final_insns = NULL;
1354 else if (fclose (final_output))
1356 error ("could not close zeroed insn dump file %qs: %m",
1357 flag_dump_final_insns);
1358 flag_dump_final_insns = NULL;
1362 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1363 level is 0. */
1364 if (debug_info_level == DINFO_LEVEL_NONE)
1365 write_symbols = NO_DEBUG;
1367 if (write_symbols == NO_DEBUG)
1369 #if defined(DBX_DEBUGGING_INFO)
1370 else if (write_symbols == DBX_DEBUG)
1371 debug_hooks = &dbx_debug_hooks;
1372 #endif
1373 #if defined(XCOFF_DEBUGGING_INFO)
1374 else if (write_symbols == XCOFF_DEBUG)
1375 debug_hooks = &xcoff_debug_hooks;
1376 #endif
1377 #ifdef SDB_DEBUGGING_INFO
1378 else if (write_symbols == SDB_DEBUG)
1379 debug_hooks = &sdb_debug_hooks;
1380 #endif
1381 #ifdef DWARF2_DEBUGGING_INFO
1382 else if (write_symbols == DWARF2_DEBUG)
1383 debug_hooks = &dwarf2_debug_hooks;
1384 #endif
1385 #ifdef VMS_DEBUGGING_INFO
1386 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1387 debug_hooks = &vmsdbg_debug_hooks;
1388 #endif
1389 else
1390 error ("target system does not support the \"%s\" debug format",
1391 debug_type_names[write_symbols]);
1393 /* We know which debug output will be used so we can set flag_var_tracking
1394 and flag_var_tracking_uninit if the user has not specified them. */
1395 if (debug_info_level < DINFO_LEVEL_NORMAL
1396 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
1398 if (flag_var_tracking == 1
1399 || flag_var_tracking_uninit == 1)
1401 if (debug_info_level < DINFO_LEVEL_NORMAL)
1402 warning (0, "variable tracking requested, but useless unless "
1403 "producing debug info");
1404 else
1405 warning (0, "variable tracking requested, but not supported "
1406 "by this debug format");
1408 flag_var_tracking = 0;
1409 flag_var_tracking_uninit = 0;
1412 /* The debug hooks are used to implement -fdump-go-spec because it
1413 gives a simple and stable API for all the information we need to
1414 dump. */
1415 if (flag_dump_go_spec != NULL)
1416 debug_hooks = dump_go_spec_init (flag_dump_go_spec, debug_hooks);
1418 /* If the user specifically requested variable tracking with tagging
1419 uninitialized variables, we need to turn on variable tracking.
1420 (We already determined above that variable tracking is feasible.) */
1421 if (flag_var_tracking_uninit)
1422 flag_var_tracking = 1;
1424 if (flag_var_tracking == AUTODETECT_VALUE)
1425 flag_var_tracking = optimize >= 1;
1427 if (flag_var_tracking_assignments == AUTODETECT_VALUE)
1428 flag_var_tracking_assignments = flag_var_tracking
1429 && !(flag_selective_scheduling || flag_selective_scheduling2);
1431 if (flag_var_tracking_assignments_toggle)
1432 flag_var_tracking_assignments = !flag_var_tracking_assignments;
1434 if (flag_var_tracking_assignments && !flag_var_tracking)
1435 flag_var_tracking = flag_var_tracking_assignments = -1;
1437 if (flag_var_tracking_assignments
1438 && (flag_selective_scheduling || flag_selective_scheduling2))
1439 warning (0, "var-tracking-assignments changes selective scheduling");
1441 if (flag_tree_cselim == AUTODETECT_VALUE)
1442 #ifdef HAVE_conditional_move
1443 flag_tree_cselim = 1;
1444 #else
1445 flag_tree_cselim = 0;
1446 #endif
1448 /* If auxiliary info generation is desired, open the output file.
1449 This goes in the same directory as the source file--unlike
1450 all the other output files. */
1451 if (flag_gen_aux_info)
1453 aux_info_file = fopen (aux_info_file_name, "w");
1454 if (aux_info_file == 0)
1455 fatal_error ("can%'t open %s: %m", aux_info_file_name);
1458 if (!targetm_common.have_named_sections)
1460 if (flag_function_sections)
1462 warning (0, "-ffunction-sections not supported for this target");
1463 flag_function_sections = 0;
1465 if (flag_data_sections)
1467 warning (0, "-fdata-sections not supported for this target");
1468 flag_data_sections = 0;
1472 if (flag_function_sections && profile_flag)
1474 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
1475 flag_function_sections = 0;
1478 #ifndef HAVE_prefetch
1479 if (flag_prefetch_loop_arrays > 0)
1481 warning (0, "-fprefetch-loop-arrays not supported for this target");
1482 flag_prefetch_loop_arrays = 0;
1484 #else
1485 if (flag_prefetch_loop_arrays > 0 && !HAVE_prefetch)
1487 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1488 flag_prefetch_loop_arrays = 0;
1490 #endif
1492 /* This combination of options isn't handled for i386 targets and doesn't
1493 make much sense anyway, so don't allow it. */
1494 if (flag_prefetch_loop_arrays > 0 && optimize_size)
1496 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1497 flag_prefetch_loop_arrays = 0;
1500 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1501 if (flag_signaling_nans)
1502 flag_trapping_math = 1;
1504 /* We cannot reassociate if we want traps or signed zeros. */
1505 if (flag_associative_math && (flag_trapping_math || flag_signed_zeros))
1507 warning (0, "-fassociative-math disabled; other options take precedence");
1508 flag_associative_math = 0;
1511 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1512 if (flag_cx_limited_range)
1513 flag_complex_method = 0;
1515 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1516 if (flag_cx_fortran_rules)
1517 flag_complex_method = 1;
1519 /* Targets must be able to place spill slots at lower addresses. If the
1520 target already uses a soft frame pointer, the transition is trivial. */
1521 if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
1523 warning (0, "-fstack-protector not supported for this target");
1524 flag_stack_protect = 0;
1526 if (!flag_stack_protect)
1527 warn_stack_protect = 0;
1529 /* ??? Unwind info is not correct around the CFG unless either a frame
1530 pointer is present or A_O_A is set. Fixing this requires rewriting
1531 unwind info generation to be aware of the CFG and propagating states
1532 around edges. */
1533 if (flag_unwind_tables && !ACCUMULATE_OUTGOING_ARGS
1534 && flag_omit_frame_pointer)
1536 warning (0, "unwind tables currently require a frame pointer "
1537 "for correctness");
1538 flag_omit_frame_pointer = 0;
1541 /* Enable -Werror=coverage-mismatch when -Werror and -Wno-error
1542 have not been set. */
1543 if (!global_options_set.x_warnings_are_errors
1544 && warn_coverage_mismatch
1545 && (global_dc->classify_diagnostic[OPT_Wcoverage_mismatch] ==
1546 DK_UNSPECIFIED))
1547 diagnostic_classify_diagnostic (global_dc, OPT_Wcoverage_mismatch,
1548 DK_ERROR, UNKNOWN_LOCATION);
1550 /* Save the current optimization options. */
1551 optimization_default_node = build_optimization_node ();
1552 optimization_current_node = optimization_default_node;
1555 /* This function can be called multiple times to reinitialize the compiler
1556 back end when register classes or instruction sets have changed,
1557 before each function. */
1558 static void
1559 backend_init_target (void)
1561 /* Initialize alignment variables. */
1562 init_alignments ();
1564 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
1565 to initialize reg_raw_mode[]. */
1566 init_emit_regs ();
1568 /* This invokes target hooks to set fixed_reg[] etc, which is
1569 mode-dependent. */
1570 init_regs ();
1572 /* This depends on stack_pointer_rtx. */
1573 init_fake_stack_mems ();
1575 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1576 mode-dependent. */
1577 init_alias_target ();
1579 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1580 init_reload ();
1582 /* The following initialization functions need to generate rtl, so
1583 provide a dummy function context for them. */
1584 init_dummy_function_start ();
1586 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1587 on a mode change. */
1588 init_expmed ();
1589 init_lower_subreg ();
1591 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1592 after a mode change as well. */
1593 caller_save_initialized_p = false;
1595 expand_dummy_function_end ();
1598 /* Initialize the compiler back end. This function is called only once,
1599 when starting the compiler. */
1600 static void
1601 backend_init (void)
1603 init_emit_once ();
1605 init_rtlanal ();
1606 init_inline_once ();
1607 init_varasm_once ();
1608 save_register_info ();
1610 /* Initialize the target-specific back end pieces. */
1611 ira_init_once ();
1612 backend_init_target ();
1615 /* Initialize excess precision settings. */
1616 static void
1617 init_excess_precision (void)
1619 /* Adjust excess precision handling based on the target options. If
1620 the front end cannot handle it, flag_excess_precision_cmdline
1621 will already have been set accordingly in the post_options
1622 hook. */
1623 gcc_assert (flag_excess_precision_cmdline != EXCESS_PRECISION_DEFAULT);
1624 flag_excess_precision = flag_excess_precision_cmdline;
1625 if (flag_unsafe_math_optimizations)
1626 flag_excess_precision = EXCESS_PRECISION_FAST;
1627 if (flag_excess_precision == EXCESS_PRECISION_STANDARD)
1629 int flt_eval_method = TARGET_FLT_EVAL_METHOD;
1630 switch (flt_eval_method)
1632 case -1:
1633 case 0:
1634 /* Either the target acts unpredictably (-1) or has all the
1635 operations required not to have excess precision (0). */
1636 flag_excess_precision = EXCESS_PRECISION_FAST;
1637 break;
1638 case 1:
1639 case 2:
1640 /* In these cases, predictable excess precision makes
1641 sense. */
1642 break;
1643 default:
1644 /* Any other implementation-defined FLT_EVAL_METHOD values
1645 require the compiler to handle the associated excess
1646 precision rules in excess_precision_type. */
1647 gcc_unreachable ();
1652 /* Initialize things that are both lang-dependent and target-dependent.
1653 This function can be called more than once if target parameters change. */
1654 static void
1655 lang_dependent_init_target (void)
1657 /* This determines excess precision settings. */
1658 init_excess_precision ();
1660 /* This creates various _DECL nodes, so needs to be called after the
1661 front end is initialized. It also depends on the HAVE_xxx macros
1662 generated from the target machine description. */
1663 init_optabs ();
1665 /* The following initialization functions need to generate rtl, so
1666 provide a dummy function context for them. */
1667 init_dummy_function_start ();
1669 /* Do the target-specific parts of expr initialization. */
1670 init_expr_target ();
1672 /* Although the actions of these functions are language-independent,
1673 they use optabs, so we cannot call them from backend_init. */
1674 init_set_costs ();
1675 ira_init ();
1677 expand_dummy_function_end ();
1680 /* Language-dependent initialization. Returns nonzero on success. */
1681 static int
1682 lang_dependent_init (const char *name)
1684 location_t save_loc = input_location;
1685 if (dump_base_name == 0)
1686 dump_base_name = name && name[0] ? name : "gccdump";
1688 /* Other front-end initialization. */
1689 input_location = BUILTINS_LOCATION;
1690 if (lang_hooks.init () == 0)
1691 return 0;
1692 input_location = save_loc;
1694 if (!flag_wpa)
1696 init_asm_output (name);
1698 /* If stack usage information is desired, open the output file. */
1699 if (flag_stack_usage)
1700 stack_usage_file = open_auxiliary_file ("su");
1703 /* This creates various _DECL nodes, so needs to be called after the
1704 front end is initialized. */
1705 init_eh ();
1707 /* Do the target-specific parts of the initialization. */
1708 lang_dependent_init_target ();
1710 if (!flag_wpa)
1712 /* If dbx symbol table desired, initialize writing it and output the
1713 predefined types. */
1714 timevar_push (TV_SYMOUT);
1716 /* Now we have the correct original filename, we can initialize
1717 debug output. */
1718 (*debug_hooks->init) (name);
1720 timevar_pop (TV_SYMOUT);
1723 return 1;
1727 /* Reinitialize everything when target parameters, such as register usage,
1728 have changed. */
1729 void
1730 target_reinit (void)
1732 struct rtl_data saved_x_rtl;
1733 rtx *saved_regno_reg_rtx;
1735 /* Save *crtl and regno_reg_rtx around the reinitialization
1736 to allow target_reinit being called even after prepare_function_start. */
1737 saved_regno_reg_rtx = regno_reg_rtx;
1738 if (saved_regno_reg_rtx)
1740 saved_x_rtl = *crtl;
1741 memset (crtl, '\0', sizeof (*crtl));
1742 regno_reg_rtx = NULL;
1745 /* Reinitialize RTL backend. */
1746 backend_init_target ();
1748 /* Reinitialize lang-dependent parts. */
1749 lang_dependent_init_target ();
1751 /* And restore it at the end, as free_after_compilation from
1752 expand_dummy_function_end clears it. */
1753 if (saved_regno_reg_rtx)
1755 *crtl = saved_x_rtl;
1756 regno_reg_rtx = saved_regno_reg_rtx;
1757 saved_regno_reg_rtx = NULL;
1761 void
1762 dump_memory_report (bool final)
1764 dump_line_table_statistics ();
1765 ggc_print_statistics ();
1766 stringpool_statistics ();
1767 dump_tree_statistics ();
1768 dump_gimple_statistics ();
1769 dump_rtx_statistics ();
1770 dump_alloc_pool_statistics ();
1771 dump_bitmap_statistics ();
1772 dump_vec_loc_statistics ();
1773 dump_ggc_loc_statistics (final);
1774 dump_alias_stats (stderr);
1775 dump_pta_stats (stderr);
1778 /* Clean up: close opened files, etc. */
1780 static void
1781 finalize (bool no_backend)
1783 /* Close the dump files. */
1784 if (flag_gen_aux_info)
1786 fclose (aux_info_file);
1787 if (seen_error ())
1788 unlink (aux_info_file_name);
1791 /* Close non-debugging input and output files. Take special care to note
1792 whether fclose returns an error, since the pages might still be on the
1793 buffer chain while the file is open. */
1795 if (asm_out_file)
1797 if (ferror (asm_out_file) != 0)
1798 fatal_error ("error writing to %s: %m", asm_file_name);
1799 if (fclose (asm_out_file) != 0)
1800 fatal_error ("error closing %s: %m", asm_file_name);
1803 if (stack_usage_file)
1804 fclose (stack_usage_file);
1806 if (!no_backend)
1808 statistics_fini ();
1810 finish_optimization_passes ();
1812 ira_finish_once ();
1815 if (mem_report)
1816 dump_memory_report (true);
1818 /* Language-specific end of compilation actions. */
1819 lang_hooks.finish ();
1822 /* Initialize the compiler, and compile the input file. */
1823 static void
1824 do_compile (void)
1826 /* Initialize timing first. The C front ends read the main file in
1827 the post_options hook, and C++ does file timings. */
1828 if (time_report || !quiet_flag || flag_detailed_statistics)
1829 timevar_init ();
1830 timevar_start (TV_TOTAL);
1832 process_options ();
1834 /* Don't do any more if an error has already occurred. */
1835 if (!seen_error ())
1837 timevar_start (TV_PHASE_SETUP);
1839 /* This must be run always, because it is needed to compute the FP
1840 predefined macros, such as __LDBL_MAX__, for targets using non
1841 default FP formats. */
1842 init_adjust_machine_modes ();
1844 /* Set up the back-end if requested. */
1845 if (!no_backend)
1846 backend_init ();
1848 /* Language-dependent initialization. Returns true on success. */
1849 if (lang_dependent_init (main_input_filename))
1851 /* Initialize yet another pass. */
1853 ggc_protect_identifiers = true;
1855 init_cgraph ();
1856 init_final (main_input_filename);
1857 coverage_init (aux_base_name);
1858 statistics_init ();
1859 invoke_plugin_callbacks (PLUGIN_START_UNIT, NULL);
1861 timevar_stop (TV_PHASE_SETUP);
1863 compile_file ();
1865 else
1867 timevar_stop (TV_PHASE_SETUP);
1870 timevar_start (TV_PHASE_FINALIZE);
1872 finalize (no_backend);
1874 timevar_stop (TV_PHASE_FINALIZE);
1877 /* Stop timing and print the times. */
1878 timevar_stop (TV_TOTAL);
1879 timevar_print (stderr);
1882 /* Entry point of cc1, cc1plus, jc1, f771, etc.
1883 Exit code is FATAL_EXIT_CODE if can't open files or if there were
1884 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
1886 It is not safe to call this function more than once. */
1889 toplev_main (int argc, char **argv)
1891 /* Parsing and gimplification sometimes need quite large stack.
1892 Increase stack size limits if possible. */
1893 stack_limit_increase (64 * 1024 * 1024);
1895 expandargv (&argc, &argv);
1897 /* Initialization of GCC's environment, and diagnostics. */
1898 general_init (argv[0]);
1900 /* One-off initialization of options that does not need to be
1901 repeated when options are added for particular functions. */
1902 init_options_once ();
1904 /* Initialize global options structures; this must be repeated for
1905 each structure used for parsing options. */
1906 init_options_struct (&global_options, &global_options_set);
1907 lang_hooks.init_options_struct (&global_options);
1909 /* Convert the options to an array. */
1910 decode_cmdline_options_to_array_default_mask (argc,
1911 CONST_CAST2 (const char **,
1912 char **, argv),
1913 &save_decoded_options,
1914 &save_decoded_options_count);
1916 /* Perform language-specific options initialization. */
1917 lang_hooks.init_options (save_decoded_options_count, save_decoded_options);
1919 /* Parse the options and do minimal processing; basically just
1920 enough to default flags appropriately. */
1921 decode_options (&global_options, &global_options_set,
1922 save_decoded_options, save_decoded_options_count,
1923 UNKNOWN_LOCATION, global_dc);
1925 handle_common_deferred_options ();
1927 init_local_tick ();
1929 initialize_plugins ();
1931 if (version_flag)
1932 print_version (stderr, "");
1934 if (help_flag)
1935 print_plugins_help (stderr, "");
1937 /* Exit early if we can (e.g. -help). */
1938 if (!exit_after_options)
1939 do_compile ();
1941 if (warningcount || errorcount)
1942 print_ignored_options ();
1943 diagnostic_finish (global_dc);
1945 /* Invoke registered plugin callbacks if any. */
1946 invoke_plugin_callbacks (PLUGIN_FINISH, NULL);
1948 finalize_plugins ();
1949 if (seen_error ())
1950 return (FATAL_EXIT_CODE);
1952 return (SUCCESS_EXIT_CODE);