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 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
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
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. */
29 #include "coretypes.h"
33 #ifdef HAVE_SYS_RESOURCE_H
34 # include <sys/resource.h>
37 #ifdef HAVE_SYS_TIMES_H
38 # include <sys/times.h>
44 #include "realmpfr.h" /* For GMP/MPFR/MPC versions, in print_version. */
49 #include "insn-attr.h"
50 #include "insn-config.h"
51 #include "insn-flags.h"
52 #include "hard-reg-set.h"
59 #include "basic-block.h"
65 #include "diagnostic.h"
66 #include "tree-diagnostic.h"
67 #include "tree-pretty-print.h"
71 #include "dwarf2asm.h"
72 #include "integrate.h"
75 #include "langhooks.h"
76 #include "cfglayout.h"
78 #include "hosthooks.h"
81 #include "opts-diagnostic.h"
83 #include "value-prof.h"
84 #include "alloc-pool.h"
85 #include "tree-mudflap.h"
86 #include "tree-pass.h"
88 #include "tree-ssa-alias.h"
91 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
92 #include "dwarf2out.h"
95 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
99 #ifdef SDB_DEBUGGING_INFO
103 #ifdef XCOFF_DEBUGGING_INFO
104 #include "xcoffout.h" /* Needed for external data
105 declarations for e.g. AIX 4.x. */
108 static void general_init (const char *);
109 static void do_compile (void);
110 static void process_options (void);
111 static void backend_init (void);
112 static int lang_dependent_init (const char *);
113 static void init_asm_output (const char *);
114 static void finalize (void);
116 static void crash_signal (int) ATTRIBUTE_NORETURN;
117 static void setup_core_dumping (void);
118 static void compile_file (void);
120 /* Nonzero to dump debug info whilst parsing (-dy option). */
121 static int set_yydebug;
123 /* True if we don't need a backend (e.g. preprocessing only). */
124 static bool no_backend;
126 /* Length of line when printing switch values. */
129 /* Decoded options, and number of such options. */
130 static struct cl_decoded_option *save_decoded_options;
131 static unsigned int save_decoded_options_count;
133 /* Name of top-level original source file (what was input to cpp).
134 This comes from the #-command at the beginning of the actual input.
135 If there isn't any there, then this is the cc1 input file name. */
137 const char *main_input_filename;
139 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
140 to optimize in process_options (). */
141 #define AUTODETECT_VALUE 2
143 /* Name to use as base of names for dump output files. */
145 const char *dump_base_name;
147 /* Directory used for dump output files. */
149 const char *dump_dir_name;
151 /* Name to use as a base for auxiliary output files. */
153 const char *aux_base_name;
155 /* Prefix for profile data files */
156 const char *profile_data_prefix;
158 /* A mask of target_flags that includes bit X if X was set or cleared
159 on the command line. */
161 int target_flags_explicit;
163 /* Debug hooks - dependent upon command line options. */
165 const struct gcc_debug_hooks *debug_hooks;
167 /* Other flags saying which kinds of debugging dump have been requested. */
169 int rtl_dump_and_exit;
170 int flag_print_asm_name;
171 enum graph_dump_types graph_dump_format;
173 /* Name for output file of assembly code, specified with -o. */
175 const char *asm_file_name;
177 /* Nonzero means do optimizations. -O.
178 Particular numeric values stand for particular amounts of optimization;
179 thus, -O2 stores 2 here. However, the optimizations beyond the basic
180 ones are not controlled directly by this variable. Instead, they are
181 controlled by individual `flag_...' variables that are defaulted
182 based on this variable. */
186 /* Nonzero means optimize for size. -Os.
187 The only valid values are zero and nonzero. When optimize_size is
188 nonzero, optimize defaults to 2, but certain individual code
189 bloating optimizations are disabled. */
191 int optimize_size = 0;
193 /* True if this is the lto front end. This is used to disable
194 gimple generation and lowering passes that are normally run on the
195 output of a front end. These passes must be bypassed for lto since
196 they have already been done before the gimple was written. */
198 bool in_lto_p = false;
200 /* Nonzero if we should write GIMPLE bytecode for link-time optimization. */
202 int flag_generate_lto;
204 /* The FUNCTION_DECL for the function currently being compiled,
205 or 0 if between functions. */
206 tree current_function_decl;
208 /* Set to the FUNC_BEGIN label of the current function, or NULL
210 const char * current_function_func_begin_label;
212 /* A random sequence of characters, unless overridden by user. */
213 static const char *flag_random_seed;
215 /* A local time stamp derived from the time of compilation. It will be
216 zero if the system cannot provide a time. It will be -1u, if the
217 user has specified a particular random seed. */
222 /* 0 means straightforward implementation of complex divide acceptable.
223 1 means wide ranges of inputs must work for complex divide.
224 2 means C99-like requirements for complex multiply and divide. */
226 int flag_complex_method = 1;
228 /* Nonzero means we should be saving declaration info into a .X file. */
230 int flag_gen_aux_info = 0;
232 /* Specified name of aux-info file. */
234 const char *aux_info_file_name;
236 /* Nonzero if we are compiling code for a shared library, zero for
241 /* Generate code for GNU or NeXT Objective-C runtime environment. */
243 #ifdef NEXT_OBJC_RUNTIME
244 int flag_next_runtime = 1;
246 int flag_next_runtime = 0;
249 /* Set to the default thread-local storage (tls) model to use. */
251 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
253 /* Set the default region and algorithm for the integrated register
256 enum ira_algorithm flag_ira_algorithm = IRA_ALGORITHM_CB;
257 enum ira_region flag_ira_region = IRA_REGION_MIXED;
259 /* Set the default for excess precision. */
261 enum excess_precision flag_excess_precision_cmdline = EXCESS_PRECISION_DEFAULT;
263 /* Nonzero means change certain warnings into errors.
264 Usually these are warnings about failure to conform to some standard. */
266 int flag_pedantic_errors = 0;
268 /* Nonzero means make permerror produce warnings instead of errors. */
270 int flag_permissive = 0;
272 /* -dA causes debug commentary information to be produced in
273 the generated assembly code (to make it more readable). This option
274 is generally only of use to those who actually need to read the
275 generated assembly code (perhaps while debugging the compiler itself).
276 Currently, this switch is only used by dwarfout.c; however, it is intended
277 to be a catchall for printing debug information in the assembler file. */
279 int flag_debug_asm = 0;
281 /* -dP causes the rtl to be emitted as a comment in assembly. */
283 int flag_dump_rtl_in_asm = 0;
285 /* When non-NULL, indicates that whenever space is allocated on the
286 stack, the resulting stack pointer must not pass this
287 address---that is, for stacks that grow downward, the stack pointer
288 must always be greater than or equal to this address; for stacks
289 that grow upward, the stack pointer must be less than this address.
290 At present, the rtx may be either a REG or a SYMBOL_REF, although
291 the support provided depends on the backend. */
294 /* Positive if we should track variables, negative if we should run
295 the var-tracking pass only to discard debug annotations, zero if
296 we're not to run it. When flag_var_tracking == AUTODETECT_VALUE it
297 will be set according to optimize, debug_info_level and debug_hooks
298 in process_options (). */
299 int flag_var_tracking = AUTODETECT_VALUE;
301 /* Positive if we should track variables at assignments, negative if
302 we should run the var-tracking pass only to discard debug
303 annotations. When flag_var_tracking_assignments ==
304 AUTODETECT_VALUE it will be set according to flag_var_tracking. */
305 int flag_var_tracking_assignments = AUTODETECT_VALUE;
307 /* Nonzero if we should toggle flag_var_tracking_assignments after
308 processing options and computing its default. */
309 int flag_var_tracking_assignments_toggle = 0;
311 /* Type of stack check. */
312 enum stack_check_type flag_stack_check = NO_STACK_CHECK;
314 /* True if the user has tagged the function with the 'section'
317 bool user_defined_section_attribute = false;
319 struct target_flag_state default_target_flag_state;
320 #if SWITCHABLE_TARGET
321 struct target_flag_state *this_target_flag_state = &default_target_flag_state;
323 #define this_target_flag_state (&default_target_flag_state)
328 const char *const string;
332 lang_independent_options;
334 /* Nonzero if subexpressions must be evaluated from left-to-right. */
335 int flag_evaluation_order = 0;
337 /* The user symbol prefix after having resolved same. */
338 const char *user_label_prefix;
340 static const param_info lang_independent_params[] = {
341 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
342 { OPTION, DEFAULT, false, MIN, MAX, HELP },
343 #include "params.def"
345 { NULL, 0, false, 0, 0, NULL }
348 /* Output files for assembler code (real compiler output)
349 and debugging dumps. */
353 FILE *stack_usage_file = NULL;
354 FILE *dump_file = NULL;
355 const char *dump_file_name;
357 /* The current working directory of a translation. It's generally the
358 directory from which compilation was initiated, but a preprocessed
359 file may specify the original directory in which it was
362 static const char *src_pwd;
364 /* Initialize src_pwd with the given string, and return true. If it
365 was already initialized, return false. As a special case, it may
366 be called with a NULL argument to test whether src_pwd has NOT been
370 set_src_pwd (const char *pwd)
374 if (strcmp (src_pwd, pwd) == 0)
380 src_pwd = xstrdup (pwd);
384 /* Return the directory from which the translation unit was initiated,
385 in case set_src_pwd() was not called before to assign it a
401 /* Called when the start of a function definition is parsed,
402 this function prints on stderr the name of the function. */
404 announce_function (tree decl)
408 if (rtl_dump_and_exit)
409 fprintf (stderr, "%s ",
410 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl))));
412 fprintf (stderr, " %s",
413 identifier_to_locale (lang_hooks.decl_printable_name (decl, 2)));
415 pp_needs_newline (global_dc->printer) = true;
416 diagnostic_set_last_function (global_dc, (diagnostic_info *) NULL);
420 /* Initialize local_tick with the time of day, or -1 if
421 flag_random_seed is set. */
424 init_local_tick (void)
426 if (!flag_random_seed)
428 /* Get some more or less random data. */
429 #ifdef HAVE_GETTIMEOFDAY
433 gettimeofday (&tv, NULL);
434 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
438 time_t now = time (NULL);
440 if (now != (time_t)-1)
441 local_tick = (unsigned) now;
449 /* Set up a default flag_random_seed and local_tick, unless the user
450 already specified one. Must be called after init_local_tick. */
453 init_random_seed (void)
455 unsigned HOST_WIDE_INT value;
456 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
458 value = local_tick ^ getpid ();
460 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
461 flag_random_seed = random_seed;
464 /* Obtain the random_seed string. Unless NOINIT, initialize it if
465 it's not provided in the command line. */
468 get_random_seed (bool noinit)
470 if (!flag_random_seed && !noinit)
472 return flag_random_seed;
475 /* Modify the random_seed string to VAL. Return its previous
479 set_random_seed (const char *val)
481 const char *old = flag_random_seed;
482 flag_random_seed = val;
486 #if GCC_VERSION < 3004
488 /* The functions clz_hwi, ctz_hwi, ffs_hwi, floor_log2 and exact_log2
489 are defined as inline functions in toplev.h if GCC_VERSION >= 3004.
490 The definitions here are used for older versions of gcc. */
492 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
493 If X is 0, return -1. */
496 floor_log2 (unsigned HOST_WIDE_INT x)
503 if (HOST_BITS_PER_WIDE_INT > 64)
504 if (x >= (unsigned HOST_WIDE_INT) 1 << (t + 64))
506 if (HOST_BITS_PER_WIDE_INT > 32)
507 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 32))
509 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 16))
511 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 8))
513 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 4))
515 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 2))
517 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 1))
523 /* Return the logarithm of X, base 2, considering X unsigned,
524 if X is a power of 2. Otherwise, returns -1. */
527 exact_log2 (unsigned HOST_WIDE_INT x)
531 return floor_log2 (x);
534 /* Given X, an unsigned number, return the number of least significant bits
535 that are zero. When X == 0, the result is the word size. */
538 ctz_hwi (unsigned HOST_WIDE_INT x)
540 return x ? floor_log2 (x & -x) : HOST_BITS_PER_WIDE_INT;
543 /* Similarly for most significant bits. */
546 clz_hwi (unsigned HOST_WIDE_INT x)
548 return HOST_BITS_PER_WIDE_INT - 1 - floor_log2(x);
551 /* Similar to ctz_hwi, except that the least significant bit is numbered
552 starting from 1, and X == 0 yields 0. */
555 ffs_hwi (unsigned HOST_WIDE_INT x)
557 return 1 + floor_log2 (x & -x);
560 #endif /* GCC_VERSION < 3004 */
562 /* Handler for fatal signals, such as SIGSEGV. These are transformed
563 into ICE messages, which is much more user friendly. In case the
564 error printer crashes, reset the signal to prevent infinite recursion. */
567 crash_signal (int signo)
569 signal (signo, SIG_DFL);
571 /* If we crashed while processing an ASM statement, then be a little more
572 graceful. It's most likely the user's fault. */
573 if (this_is_asm_operands)
575 output_operand_lossage ("unrecoverable error");
576 exit (FATAL_EXIT_CODE);
579 internal_error ("%s", strsignal (signo));
582 /* Arrange to dump core on error. (The regular error message is still
583 printed first, except in the case of abort().) */
586 setup_core_dumping (void)
589 signal (SIGABRT, SIG_DFL);
591 #if defined(HAVE_SETRLIMIT)
594 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
595 fatal_error ("getting core file size maximum limit: %m");
596 rlim.rlim_cur = rlim.rlim_max;
597 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
598 fatal_error ("setting core file size limit to maximum: %m");
601 diagnostic_abort_on_error (global_dc);
605 /* Strip off a legitimate source ending from the input string NAME of
606 length LEN. Rather than having to know the names used by all of
607 our front ends, we strip off an ending of a period followed by
608 up to five characters. (Java uses ".class".) */
611 strip_off_ending (char *name, int len)
614 for (i = 2; i < 6 && len > i; i++)
616 if (name[len - i] == '.')
618 name[len - i] = '\0';
624 /* Output a quoted string. */
627 output_quoted_string (FILE *asm_file, const char *string)
629 #ifdef OUTPUT_QUOTED_STRING
630 OUTPUT_QUOTED_STRING (asm_file, string);
634 putc ('\"', asm_file);
635 while ((c = *string++) != 0)
639 if (c == '\"' || c == '\\')
640 putc ('\\', asm_file);
644 fprintf (asm_file, "\\%03o", (unsigned char) c);
646 putc ('\"', asm_file);
650 /* A subroutine of wrapup_global_declarations. We've come to the end of
651 the compilation unit. All deferred variables should be undeferred,
652 and all incomplete decls should be finalized. */
655 wrapup_global_declaration_1 (tree decl)
657 /* We're not deferring this any longer. Assignment is conditional to
658 avoid needlessly dirtying PCH pages. */
659 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl), TS_DECL_WITH_VIS)
660 && DECL_DEFER_OUTPUT (decl) != 0)
661 DECL_DEFER_OUTPUT (decl) = 0;
663 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
664 lang_hooks.finish_incomplete_decl (decl);
667 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
668 needs to be output. Return true if it is output. */
671 wrapup_global_declaration_2 (tree decl)
673 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
676 /* Don't write out static consts, unless we still need them.
678 We also keep static consts if not optimizing (for debugging),
679 unless the user specified -fno-keep-static-consts.
680 ??? They might be better written into the debug information.
681 This is possible when using DWARF.
683 A language processor that wants static constants to be always
684 written out (even if it is not used) is responsible for
685 calling rest_of_decl_compilation itself. E.g. the C front-end
686 calls rest_of_decl_compilation from finish_decl.
687 One motivation for this is that is conventional in some
688 environments to write things like:
689 static const char rcsid[] = "... version string ...";
690 intending to force the string to be in the executable.
692 A language processor that would prefer to have unneeded
693 static constants "optimized away" would just defer writing
694 them out until here. E.g. C++ does this, because static
695 constants are often defined in header files.
697 ??? A tempting alternative (for both C and C++) would be
698 to force a constant to be written if and only if it is
699 defined in a main file, as opposed to an include file. */
701 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
703 struct varpool_node *node;
705 node = varpool_get_node (decl);
707 if (!node && flag_ltrans)
709 else if (node && node->finalized)
711 else if (node && node->alias)
713 else if (!cgraph_global_info_ready
715 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
717 else if (node && node->needed)
719 else if (DECL_COMDAT (decl))
721 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
722 && (optimize || !flag_keep_static_consts
723 || DECL_ARTIFICIAL (decl)))
728 rest_of_decl_compilation (decl, 1, 1);
736 /* Do any final processing required for the declarations in VEC, of
737 which there are LEN. We write out inline functions and variables
738 that have been deferred until this point, but which are required.
739 Returns nonzero if anything was put out. */
742 wrapup_global_declarations (tree *vec, int len)
744 bool reconsider, output_something = false;
747 for (i = 0; i < len; i++)
748 wrapup_global_declaration_1 (vec[i]);
750 /* Now emit any global variables or functions that we have been
751 putting off. We need to loop in case one of the things emitted
752 here references another one which comes earlier in the list. */
756 for (i = 0; i < len; i++)
757 reconsider |= wrapup_global_declaration_2 (vec[i]);
759 output_something = true;
763 return output_something;
766 /* A subroutine of check_global_declarations. Issue appropriate warnings
767 for the global declaration DECL. */
770 check_global_declaration_1 (tree decl)
772 /* Warn about any function declared static but not defined. We don't
773 warn about variables, because many programs have static variables
774 that exist only to get some text into the object file. */
775 if (TREE_CODE (decl) == FUNCTION_DECL
776 && DECL_INITIAL (decl) == 0
777 && DECL_EXTERNAL (decl)
778 && ! DECL_ARTIFICIAL (decl)
779 && ! TREE_NO_WARNING (decl)
780 && ! TREE_PUBLIC (decl)
781 && (warn_unused_function
782 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
784 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
785 pedwarn (input_location, 0, "%q+F used but never defined", decl);
787 warning (OPT_Wunused_function, "%q+F declared %<static%> but never defined", decl);
788 /* This symbol is effectively an "extern" declaration now. */
789 TREE_PUBLIC (decl) = 1;
790 assemble_external (decl);
793 /* Warn about static fns or vars defined but not used. */
794 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
795 /* We don't warn about "static const" variables because the
796 "rcs_id" idiom uses that construction. */
797 || (warn_unused_variable
798 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
799 && ! DECL_IN_SYSTEM_HEADER (decl)
800 && ! TREE_USED (decl)
801 /* The TREE_USED bit for file-scope decls is kept in the identifier,
802 to handle multiple external decls in different scopes. */
803 && ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl)))
804 && ! DECL_EXTERNAL (decl)
805 && ! TREE_PUBLIC (decl)
806 /* A volatile variable might be used in some non-obvious way. */
807 && ! TREE_THIS_VOLATILE (decl)
808 /* Global register variables must be declared to reserve them. */
809 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
810 /* Otherwise, ask the language. */
811 && lang_hooks.decls.warn_unused_global (decl))
812 warning ((TREE_CODE (decl) == FUNCTION_DECL)
813 ? OPT_Wunused_function
814 : OPT_Wunused_variable,
815 "%q+D defined but not used", decl);
818 /* Issue appropriate warnings for the global declarations in VEC (of
819 which there are LEN). */
822 check_global_declarations (tree *vec, int len)
826 for (i = 0; i < len; i++)
827 check_global_declaration_1 (vec[i]);
830 /* Emit debugging information for all global declarations in VEC. */
833 emit_debug_global_declarations (tree *vec, int len)
837 /* Avoid confusing the debug information machinery when there are errors. */
841 timevar_push (TV_SYMOUT);
842 for (i = 0; i < len; i++)
843 debug_hooks->global_decl (vec[i]);
844 timevar_pop (TV_SYMOUT);
847 /* Warn about a use of an identifier which was marked deprecated. */
849 warn_deprecated_use (tree node, tree attr)
853 if (node == 0 || !warn_deprecated_decl)
859 attr = DECL_ATTRIBUTES (node);
860 else if (TYPE_P (node))
862 tree decl = TYPE_STUB_DECL (node);
864 attr = lookup_attribute ("deprecated",
865 TYPE_ATTRIBUTES (TREE_TYPE (decl)));
870 attr = lookup_attribute ("deprecated", attr);
873 msg = TREE_STRING_POINTER (TREE_VALUE (TREE_VALUE (attr)));
879 expanded_location xloc = expand_location (DECL_SOURCE_LOCATION (node));
881 warning (OPT_Wdeprecated_declarations,
882 "%qD is deprecated (declared at %s:%d): %s",
883 node, xloc.file, xloc.line, msg);
885 warning (OPT_Wdeprecated_declarations,
886 "%qD is deprecated (declared at %s:%d)",
887 node, xloc.file, xloc.line);
889 else if (TYPE_P (node))
891 tree what = NULL_TREE;
892 tree decl = TYPE_STUB_DECL (node);
894 if (TYPE_NAME (node))
896 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
897 what = TYPE_NAME (node);
898 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
899 && DECL_NAME (TYPE_NAME (node)))
900 what = DECL_NAME (TYPE_NAME (node));
905 expanded_location xloc
906 = expand_location (DECL_SOURCE_LOCATION (decl));
910 warning (OPT_Wdeprecated_declarations,
911 "%qE is deprecated (declared at %s:%d): %s",
912 what, xloc.file, xloc.line, msg);
914 warning (OPT_Wdeprecated_declarations,
915 "%qE is deprecated (declared at %s:%d)", what,
916 xloc.file, xloc.line);
921 warning (OPT_Wdeprecated_declarations,
922 "type is deprecated (declared at %s:%d): %s",
923 xloc.file, xloc.line, msg);
925 warning (OPT_Wdeprecated_declarations,
926 "type is deprecated (declared at %s:%d)",
927 xloc.file, xloc.line);
935 warning (OPT_Wdeprecated_declarations, "%qE is deprecated: %s",
938 warning (OPT_Wdeprecated_declarations, "%qE is deprecated", what);
943 warning (OPT_Wdeprecated_declarations, "type is deprecated: %s",
946 warning (OPT_Wdeprecated_declarations, "type is deprecated");
952 /* Compile an entire translation unit. Write a file of assembly
953 output and various debugging dumps. */
958 /* Initialize yet another pass. */
960 ggc_protect_identifiers = true;
963 init_final (main_input_filename);
964 coverage_init (aux_base_name);
966 invoke_plugin_callbacks (PLUGIN_START_UNIT, NULL);
968 timevar_push (TV_PARSE);
970 /* Call the parser, which parses the entire file (calling
971 rest_of_compilation for each function). */
972 lang_hooks.parse_file (set_yydebug);
974 /* Compilation is now finished except for writing
975 what's left of the symbol table output. */
976 timevar_pop (TV_PARSE);
978 if (flag_syntax_only || flag_wpa)
981 ggc_protect_identifiers = false;
983 /* This must also call cgraph_finalize_compilation_unit. */
984 lang_hooks.decls.final_write_globals ();
989 varpool_assemble_pending_decls ();
992 /* Likewise for mudflap static object registrations. */
994 mudflap_finish_file ();
996 output_shared_constant_pool ();
997 output_object_blocks ();
999 /* Write out any pending weak symbol declarations. */
1002 /* This must be at the end before unwind and debug info.
1003 Some target ports emit PIC setup thunks here. */
1004 targetm.asm_out.code_end ();
1006 /* Do dbx symbols. */
1007 timevar_push (TV_SYMOUT);
1009 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
1010 if (dwarf2out_do_frame ())
1011 dwarf2out_frame_finish ();
1014 (*debug_hooks->finish) (main_input_filename);
1015 timevar_pop (TV_SYMOUT);
1017 /* Output some stuff at end of file if nec. */
1019 dw2_output_indirect_constants ();
1021 /* Flush any pending external directives. */
1022 process_pending_assemble_externals ();
1024 /* Emit LTO marker if LTO info has been previously emitted. This is
1025 used by collect2 to determine whether an object file contains IL.
1026 We used to emit an undefined reference here, but this produces
1027 link errors if an object file with IL is stored into a shared
1028 library without invoking lto1. */
1029 if (flag_generate_lto)
1031 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1032 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
1034 (unsigned HOST_WIDE_INT) 1, 8);
1035 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1036 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_v1",
1037 (unsigned HOST_WIDE_INT) 1, 8);
1039 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_v1",
1040 (unsigned HOST_WIDE_INT) 1,
1041 (unsigned HOST_WIDE_INT) 1);
1045 /* Attach a special .ident directive to the end of the file to identify
1046 the version of GCC which compiled this code. The format of the .ident
1047 string is patterned after the ones produced by native SVR4 compilers. */
1051 const char *pkg_version = "(GNU) ";
1053 if (strcmp ("(GCC) ", pkgversion_string))
1054 pkg_version = pkgversion_string;
1055 fprintf (asm_out_file, "%s\"GCC: %s%s\"\n",
1056 IDENT_ASM_OP, pkg_version, version_string);
1060 /* Invoke registered plugin callbacks. */
1061 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT, NULL);
1063 /* This must be at the end. Some target ports emit end of file directives
1064 into the assembly file here, and hence we can not output anything to the
1065 assembly file after this point. */
1066 targetm.asm_out.file_end ();
1069 /* Parse a -d... command line switch. */
1072 decode_d_option (const char *arg)
1083 flag_print_asm_name = 1;
1086 flag_dump_rtl_in_asm = 1;
1087 flag_print_asm_name = 1;
1090 graph_dump_format = vcg;
1093 rtl_dump_and_exit = 1;
1098 case 'D': /* These are handled by the preprocessor. */
1105 setup_core_dumping();
1108 enable_rtl_dump_file ();
1112 warning (0, "unrecognized gcc debugging option: %c", c);
1117 /* Indexed by enum debug_info_type. */
1118 const char *const debug_type_names[] =
1120 "none", "stabs", "coff", "dwarf-2", "xcoff", "vms"
1123 /* Print version information to FILE.
1124 Each line begins with INDENT (for the case where FILE is the
1125 assembler output file). */
1128 print_version (FILE *file, const char *indent)
1130 static const char fmt1[] =
1132 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
1134 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
1137 static const char fmt2[] =
1138 N_("GMP version %s, MPFR version %s, MPC version %s\n");
1139 static const char fmt3[] =
1140 N_("%s%swarning: %s header version %s differs from library version %s.\n");
1141 static const char fmt4[] =
1142 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
1144 #define __VERSION__ "[?]"
1147 file == stderr ? _(fmt1) : fmt1,
1148 indent, *indent != 0 ? " " : "",
1149 lang_hooks.name, pkgversion_string, version_string, TARGET_NAME,
1150 indent, __VERSION__);
1152 /* We need to stringify the GMP macro values. Ugh, gmp_version has
1153 two string formats, "i.j.k" and "i.j" when k is zero. As of
1154 gmp-4.3.0, GMP always uses the 3 number format. */
1155 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
1156 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3(X)
1157 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
1158 #define GCC_GMP_VERSION \
1159 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
1160 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
1161 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
1162 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR)
1164 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
1165 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) "." \
1166 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_PATCHLEVEL)
1169 file == stderr ? _(fmt2) : fmt2,
1170 GCC_GMP_STRINGIFY_VERSION, MPFR_VERSION_STRING, MPC_VERSION_STRING);
1171 if (strcmp (GCC_GMP_STRINGIFY_VERSION, gmp_version))
1173 file == stderr ? _(fmt3) : fmt3,
1174 indent, *indent != 0 ? " " : "",
1175 "GMP", GCC_GMP_STRINGIFY_VERSION, gmp_version);
1176 if (strcmp (MPFR_VERSION_STRING, mpfr_get_version ()))
1178 file == stderr ? _(fmt3) : fmt3,
1179 indent, *indent != 0 ? " " : "",
1180 "MPFR", MPFR_VERSION_STRING, mpfr_get_version ());
1181 if (strcmp (MPC_VERSION_STRING, mpc_get_version ()))
1183 file == stderr ? _(fmt3) : fmt3,
1184 indent, *indent != 0 ? " " : "",
1185 "MPC", MPC_VERSION_STRING, mpc_get_version ());
1187 file == stderr ? _(fmt4) : fmt4,
1188 indent, *indent != 0 ? " " : "",
1189 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
1191 print_plugins_versions (file, indent);
1194 #ifdef ASM_COMMENT_START
1196 print_to_asm_out_file (print_switch_type type, const char * text)
1198 bool prepend_sep = true;
1202 case SWITCH_TYPE_LINE_END:
1203 putc ('\n', asm_out_file);
1206 case SWITCH_TYPE_LINE_START:
1207 fputs (ASM_COMMENT_START, asm_out_file);
1208 return strlen (ASM_COMMENT_START);
1210 case SWITCH_TYPE_DESCRIPTIVE:
1211 if (ASM_COMMENT_START[0] == 0)
1212 prepend_sep = false;
1214 case SWITCH_TYPE_PASSED:
1215 case SWITCH_TYPE_ENABLED:
1217 fputc (' ', asm_out_file);
1218 fputs (text, asm_out_file);
1219 /* No need to return the length here as
1220 print_single_switch has already done it. */
1230 print_to_stderr (print_switch_type type, const char * text)
1234 case SWITCH_TYPE_LINE_END:
1235 putc ('\n', stderr);
1238 case SWITCH_TYPE_LINE_START:
1241 case SWITCH_TYPE_PASSED:
1242 case SWITCH_TYPE_ENABLED:
1243 fputc (' ', stderr);
1246 case SWITCH_TYPE_DESCRIPTIVE:
1247 fputs (text, stderr);
1248 /* No need to return the length here as
1249 print_single_switch has already done it. */
1257 /* Print an option value and return the adjusted position in the line.
1258 ??? print_fn doesn't handle errors, eg disk full; presumably other
1259 code will catch a disk full though. */
1262 print_single_switch (print_switch_fn_type print_fn,
1264 print_switch_type type,
1267 /* The ultrix fprintf returns 0 on success, so compute the result
1268 we want here since we need it for the following test. The +1
1269 is for the separator character that will probably be emitted. */
1270 int len = strlen (text) + 1;
1273 && pos + len > MAX_LINE)
1275 print_fn (SWITCH_TYPE_LINE_END, NULL);
1280 pos += print_fn (SWITCH_TYPE_LINE_START, NULL);
1282 print_fn (type, text);
1286 /* Print active target switches using PRINT_FN.
1287 POS is the current cursor position and MAX is the size of a "line".
1288 Each line begins with INDENT and ends with TERM.
1289 Each switch is separated from the next by SEP. */
1292 print_switch_values (print_switch_fn_type print_fn)
1297 /* Fill in the -frandom-seed option, if the user didn't pass it, so
1298 that it can be printed below. This helps reproducibility. */
1299 if (!flag_random_seed)
1300 init_random_seed ();
1302 /* Print the options as passed. */
1303 pos = print_single_switch (print_fn, pos,
1304 SWITCH_TYPE_DESCRIPTIVE, _("options passed: "));
1306 for (j = 1; j < save_decoded_options_count; j++)
1308 switch (save_decoded_options[j].opt_index)
1321 pos = print_single_switch (print_fn, pos, SWITCH_TYPE_PASSED,
1322 save_decoded_options[j].orig_option_with_args_text);
1326 print_fn (SWITCH_TYPE_LINE_END, NULL);
1328 /* Print the -f and -m options that have been enabled.
1329 We don't handle language specific options but printing argv
1331 pos = print_single_switch (print_fn, 0,
1332 SWITCH_TYPE_DESCRIPTIVE, _("options enabled: "));
1334 for (j = 0; j < cl_options_count; j++)
1335 if ((cl_options[j].flags & CL_REPORT)
1336 && option_enabled (j) > 0)
1337 pos = print_single_switch (print_fn, pos,
1338 SWITCH_TYPE_ENABLED, cl_options[j].opt_text);
1340 print_fn (SWITCH_TYPE_LINE_END, NULL);
1343 /* Open assembly code output file. Do this even if -fsyntax-only is
1344 on, because then the driver will have provided the name of a
1345 temporary file or bit bucket for us. NAME is the file specified on
1346 the command line, possibly NULL. */
1348 init_asm_output (const char *name)
1350 if (name == NULL && asm_file_name == 0)
1351 asm_out_file = stdout;
1354 if (asm_file_name == 0)
1356 int len = strlen (dump_base_name);
1357 char *dumpname = XNEWVEC (char, len + 6);
1359 memcpy (dumpname, dump_base_name, len + 1);
1360 strip_off_ending (dumpname, len);
1361 strcat (dumpname, ".s");
1362 asm_file_name = dumpname;
1364 if (!strcmp (asm_file_name, "-"))
1365 asm_out_file = stdout;
1367 asm_out_file = fopen (asm_file_name, "w+b");
1368 if (asm_out_file == 0)
1369 fatal_error ("can%'t open %s for writing: %m", asm_file_name);
1372 if (!flag_syntax_only)
1374 targetm.asm_out.file_start ();
1376 if (flag_record_gcc_switches)
1378 if (targetm.asm_out.record_gcc_switches)
1380 /* Let the target know that we are about to start recording. */
1381 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
1383 /* Now record the switches. */
1384 print_switch_values (targetm.asm_out.record_gcc_switches);
1385 /* Let the target know that the recording is over. */
1386 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
1390 inform (input_location, "-frecord-gcc-switches is not supported by the current target");
1393 #ifdef ASM_COMMENT_START
1394 if (flag_verbose_asm)
1396 /* Print the list of switches in effect
1397 into the assembler file as comments. */
1398 print_version (asm_out_file, ASM_COMMENT_START);
1399 print_switch_values (print_to_asm_out_file);
1400 putc ('\n', asm_out_file);
1406 /* Return true if the state of option OPTION should be stored in PCH files
1407 and checked by default_pch_valid_p. Store the option's current state
1411 option_affects_pch_p (int option, struct cl_option_state *state)
1413 if ((cl_options[option].flags & CL_TARGET) == 0)
1415 if (cl_options[option].flag_var == &target_flags)
1416 if (targetm.check_pch_target_flags)
1418 return get_option_state (option, state);
1421 /* Default version of get_pch_validity.
1422 By default, every flag difference is fatal; that will be mostly right for
1423 most targets, but completely right for very few. */
1426 default_get_pch_validity (size_t *sz)
1428 struct cl_option_state state;
1433 if (targetm.check_pch_target_flags)
1434 *sz += sizeof (target_flags);
1435 for (i = 0; i < cl_options_count; i++)
1436 if (option_affects_pch_p (i, &state))
1439 result = r = XNEWVEC (char, *sz);
1443 if (targetm.check_pch_target_flags)
1445 memcpy (r, &target_flags, sizeof (target_flags));
1446 r += sizeof (target_flags);
1449 for (i = 0; i < cl_options_count; i++)
1450 if (option_affects_pch_p (i, &state))
1452 memcpy (r, state.data, state.size);
1459 /* Return a message which says that a PCH file was created with a different
1460 setting of OPTION. */
1463 pch_option_mismatch (const char *option)
1467 asprintf (&r, _("created and used with differing settings of '%s'"), option);
1469 return _("out of memory");
1473 /* Default version of pch_valid_p. */
1476 default_pch_valid_p (const void *data_p, size_t len)
1478 struct cl_option_state state;
1479 const char *data = (const char *)data_p;
1482 /* -fpic and -fpie also usually make a PCH invalid. */
1483 if (data[0] != flag_pic)
1484 return _("created and used with different settings of -fpic");
1485 if (data[1] != flag_pie)
1486 return _("created and used with different settings of -fpie");
1489 /* Check target_flags. */
1490 if (targetm.check_pch_target_flags)
1495 memcpy (&tf, data, sizeof (target_flags));
1496 data += sizeof (target_flags);
1497 len -= sizeof (target_flags);
1498 r = targetm.check_pch_target_flags (tf);
1503 for (i = 0; i < cl_options_count; i++)
1504 if (option_affects_pch_p (i, &state))
1506 if (memcmp (data, state.data, state.size) != 0)
1507 return pch_option_mismatch (cl_options[i].opt_text);
1515 /* Default tree printer. Handles declarations only. */
1517 default_tree_printer (pretty_printer *pp, text_info *text, const char *spec,
1518 int precision, bool wide, bool set_locus, bool hash)
1522 /* FUTURE: %+x should set the locus. */
1523 if (precision != 0 || wide || hash)
1529 t = va_arg (*text->args_ptr, tree);
1530 if (TREE_CODE (t) == IDENTIFIER_NODE)
1532 pp_identifier (pp, IDENTIFIER_POINTER (t));
1538 t = va_arg (*text->args_ptr, tree);
1539 if (DECL_DEBUG_EXPR_IS_FROM (t) && DECL_DEBUG_EXPR (t))
1540 t = DECL_DEBUG_EXPR (t);
1545 t = va_arg (*text->args_ptr, tree);
1549 percent_K_format (text);
1556 if (set_locus && text->locus)
1557 *text->locus = DECL_SOURCE_LOCATION (t);
1561 const char *n = DECL_NAME (t)
1562 ? identifier_to_locale (lang_hooks.decl_printable_name (t, 2))
1567 dump_generic_node (pp, t, 0, TDF_DIAGNOSTIC, 0);
1572 /* A helper function; used as the reallocator function for cpp's line
1575 realloc_for_line_map (void *ptr, size_t len)
1577 return GGC_RESIZEVAR (void, ptr, len);
1580 /* A helper function: used as the allocator function for
1581 identifier_to_locale. */
1583 alloc_for_identifier_to_locale (size_t len)
1585 return ggc_alloc_atomic (len);
1588 /* Output stack usage information. */
1590 output_stack_usage (void)
1592 static bool warning_issued = false;
1593 enum stack_usage_kind_type { STATIC = 0, DYNAMIC, DYNAMIC_BOUNDED };
1594 const char *stack_usage_kind_str[] = {
1599 HOST_WIDE_INT stack_usage = current_function_static_stack_size;
1600 enum stack_usage_kind_type stack_usage_kind;
1601 expanded_location loc;
1602 const char *raw_id, *id;
1604 if (stack_usage < 0)
1606 if (!warning_issued)
1608 warning (0, "-fstack-usage not supported for this target");
1609 warning_issued = true;
1614 stack_usage_kind = STATIC;
1616 /* Add the maximum amount of space pushed onto the stack. */
1617 if (current_function_pushed_stack_size > 0)
1619 stack_usage += current_function_pushed_stack_size;
1620 stack_usage_kind = DYNAMIC_BOUNDED;
1623 /* Now on to the tricky part: dynamic stack allocation. */
1624 if (current_function_allocates_dynamic_stack_space)
1626 if (current_function_has_unbounded_dynamic_stack_size)
1627 stack_usage_kind = DYNAMIC;
1629 stack_usage_kind = DYNAMIC_BOUNDED;
1631 /* Add the size even in the unbounded case, this can't hurt. */
1632 stack_usage += current_function_dynamic_stack_size;
1635 loc = expand_location (DECL_SOURCE_LOCATION (current_function_decl));
1637 /* Strip the scope prefix if any. */
1638 raw_id = lang_hooks.decl_printable_name (current_function_decl, 2);
1639 id = strrchr (raw_id, '.');
1645 fprintf (stack_usage_file,
1646 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC"\t%s\n",
1647 lbasename (loc.file),
1652 stack_usage_kind_str[stack_usage_kind]);
1655 /* Open an auxiliary output file. */
1657 open_auxiliary_file (const char *ext)
1662 filename = concat (aux_base_name, ".", ext, NULL);
1663 file = fopen (filename, "w");
1665 fatal_error ("can't open %s for writing: %m", filename);
1670 /* Initialization of the front end environment, before command line
1671 options are parsed. Signal handlers, internationalization etc.
1672 ARGV0 is main's argv[0]. */
1674 general_init (const char *argv0)
1678 p = argv0 + strlen (argv0);
1679 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1683 xmalloc_set_program_name (progname);
1687 /* Unlock the stdio streams. */
1688 unlock_std_streams ();
1690 gcc_init_libintl ();
1692 identifier_to_locale_alloc = alloc_for_identifier_to_locale;
1693 identifier_to_locale_free = ggc_free;
1695 /* Initialize the diagnostics reporting machinery, so option parsing
1696 can give warnings and errors. */
1697 diagnostic_initialize (global_dc, N_OPTS);
1698 diagnostic_starter (global_dc) = default_tree_diagnostic_starter;
1699 /* Set a default printer. Language specific initializations will
1700 override it later. */
1701 pp_format_decoder (global_dc->printer) = &default_tree_printer;
1702 global_dc->show_option_requested = flag_diagnostics_show_option;
1703 global_dc->show_column = flag_show_column;
1704 global_dc->internal_error = plugins_internal_error_function;
1705 global_dc->option_enabled = option_enabled;
1706 global_dc->option_name = option_name;
1708 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1710 signal (SIGSEGV, crash_signal);
1713 signal (SIGILL, crash_signal);
1716 signal (SIGBUS, crash_signal);
1719 signal (SIGABRT, crash_signal);
1721 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1722 signal (SIGIOT, crash_signal);
1725 signal (SIGFPE, crash_signal);
1728 /* Other host-specific signal setup. */
1729 (*host_hooks.extra_signals)();
1731 /* Initialize the garbage-collector, string pools and tree type hash
1735 line_table = ggc_alloc_line_maps ();
1736 linemap_init (line_table);
1737 line_table->reallocator = realloc_for_line_map;
1740 /* Initialize register usage now so switches may override. */
1743 /* Register the language-independent parameters. */
1744 add_params (lang_independent_params, LAST_PARAM);
1746 /* This must be done after add_params but before argument processing. */
1747 init_ggc_heuristics();
1748 init_optimization_passes ();
1749 statistics_early_init ();
1752 /* Return true if the current target supports -fsection-anchors. */
1755 target_supports_section_anchors_p (void)
1757 if (targetm.min_anchor_offset == 0 && targetm.max_anchor_offset == 0)
1760 if (targetm.asm_out.output_anchor == NULL)
1766 /* Default the align_* variables to 1 if they're still unset, and
1767 set up the align_*_log variables. */
1769 init_alignments (void)
1771 if (align_loops <= 0)
1773 if (align_loops_max_skip > align_loops)
1774 align_loops_max_skip = align_loops - 1;
1775 align_loops_log = floor_log2 (align_loops * 2 - 1);
1776 if (align_jumps <= 0)
1778 if (align_jumps_max_skip > align_jumps)
1779 align_jumps_max_skip = align_jumps - 1;
1780 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1781 if (align_labels <= 0)
1783 align_labels_log = floor_log2 (align_labels * 2 - 1);
1784 if (align_labels_max_skip > align_labels)
1785 align_labels_max_skip = align_labels - 1;
1786 if (align_functions <= 0)
1787 align_functions = 1;
1788 align_functions_log = floor_log2 (align_functions * 2 - 1);
1791 /* Process the options that have been parsed. */
1793 process_options (void)
1795 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1796 This can happen with incorrect pre-processed input. */
1797 debug_hooks = &do_nothing_debug_hooks;
1799 /* This replaces set_Wunused. */
1800 if (warn_unused_function == -1)
1801 warn_unused_function = warn_unused;
1802 if (warn_unused_label == -1)
1803 warn_unused_label = warn_unused;
1804 /* Wunused-parameter is enabled if both -Wunused -Wextra are enabled. */
1805 if (warn_unused_parameter == -1)
1806 warn_unused_parameter = (warn_unused && extra_warnings);
1807 if (warn_unused_variable == -1)
1808 warn_unused_variable = warn_unused;
1809 /* Wunused-but-set-parameter is enabled if both -Wunused -Wextra are
1811 if (warn_unused_but_set_parameter == -1)
1812 warn_unused_but_set_parameter = (warn_unused && extra_warnings);
1813 if (warn_unused_but_set_variable == -1)
1814 warn_unused_but_set_variable = warn_unused;
1815 if (warn_unused_value == -1)
1816 warn_unused_value = warn_unused;
1818 /* This replaces set_Wextra. */
1819 if (warn_uninitialized == -1)
1820 warn_uninitialized = extra_warnings;
1822 /* Allow the front end to perform consistency checks and do further
1823 initialization based on the command line options. This hook also
1824 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1825 so we can correctly initialize debug output. */
1826 no_backend = lang_hooks.post_options (&main_input_filename);
1828 /* Some machines may reject certain combinations of options. */
1829 targetm.target_option.override ();
1831 /* Avoid any informative notes in the second run of -fcompare-debug. */
1832 if (flag_compare_debug)
1833 diagnostic_inhibit_notes (global_dc);
1835 if (flag_section_anchors && !target_supports_section_anchors_p ())
1837 warning (OPT_fsection_anchors,
1838 "this target does not support %qs", "-fsection-anchors");
1839 flag_section_anchors = 0;
1842 if (flag_short_enums == 2)
1843 flag_short_enums = targetm.default_short_enums ();
1845 /* Set aux_base_name if not already set. */
1848 else if (main_input_filename)
1850 char *name = xstrdup (lbasename (main_input_filename));
1852 strip_off_ending (name, strlen (name));
1853 aux_base_name = name;
1856 aux_base_name = "gccaux";
1861 || flag_loop_interchange
1862 || flag_loop_strip_mine
1863 || flag_graphite_identity
1864 || flag_loop_parallelize_all)
1865 sorry ("Graphite loop optimizations cannot be used");
1868 /* Unrolling all loops implies that standard loop unrolling must also
1870 if (flag_unroll_all_loops)
1871 flag_unroll_loops = 1;
1873 /* The loop unrolling code assumes that cse will be run after loop.
1874 web and rename-registers also help when run after loop unrolling. */
1875 if (flag_rerun_cse_after_loop == AUTODETECT_VALUE)
1876 flag_rerun_cse_after_loop = flag_unroll_loops || flag_peel_loops;
1878 if (flag_web == AUTODETECT_VALUE)
1879 flag_web = flag_unroll_loops || flag_peel_loops;
1881 if (flag_rename_registers == AUTODETECT_VALUE)
1882 flag_rename_registers = flag_unroll_loops || flag_peel_loops;
1884 if (flag_non_call_exceptions)
1885 flag_asynchronous_unwind_tables = 1;
1886 if (flag_asynchronous_unwind_tables)
1887 flag_unwind_tables = 1;
1889 if (flag_value_profile_transformations)
1890 flag_profile_values = 1;
1892 /* Warn about options that are not supported on this machine. */
1893 #ifndef INSN_SCHEDULING
1894 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1895 warning (0, "instruction scheduling not supported on this target machine");
1898 if (flag_delayed_branch)
1899 warning (0, "this target machine does not have delayed branches");
1902 user_label_prefix = USER_LABEL_PREFIX;
1903 if (flag_leading_underscore != -1)
1905 /* If the default prefix is more complicated than "" or "_",
1906 issue a warning and ignore this option. */
1907 if (user_label_prefix[0] == 0 ||
1908 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1910 user_label_prefix = flag_leading_underscore ? "_" : "";
1913 warning (0, "-f%sleading-underscore not supported on this target machine",
1914 flag_leading_underscore ? "" : "no-");
1917 /* If we are in verbose mode, write out the version and maybe all the
1918 option flags in use. */
1921 print_version (stderr, "");
1923 print_switch_values (print_to_stderr);
1926 if (flag_syntax_only)
1928 write_symbols = NO_DEBUG;
1934 if (debug_info_level == DINFO_LEVEL_NONE)
1936 debug_info_level = DINFO_LEVEL_NORMAL;
1938 if (write_symbols == NO_DEBUG)
1939 write_symbols = PREFERRED_DEBUGGING_TYPE;
1942 debug_info_level = DINFO_LEVEL_NONE;
1945 if (flag_dump_final_insns && !flag_syntax_only && !no_backend)
1947 FILE *final_output = fopen (flag_dump_final_insns, "w");
1950 error ("could not open final insn dump file %qs: %m",
1951 flag_dump_final_insns);
1952 flag_dump_final_insns = NULL;
1954 else if (fclose (final_output))
1956 error ("could not close zeroed insn dump file %qs: %m",
1957 flag_dump_final_insns);
1958 flag_dump_final_insns = NULL;
1962 /* Unless over-ridden for the target, assume that all DWARF levels
1963 may be emitted, if DWARF2_DEBUG is selected. */
1964 if (dwarf_strict < 0)
1967 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1969 if (debug_info_level == DINFO_LEVEL_NONE)
1970 write_symbols = NO_DEBUG;
1972 if (write_symbols == NO_DEBUG)
1974 #if defined(DBX_DEBUGGING_INFO)
1975 else if (write_symbols == DBX_DEBUG)
1976 debug_hooks = &dbx_debug_hooks;
1978 #if defined(XCOFF_DEBUGGING_INFO)
1979 else if (write_symbols == XCOFF_DEBUG)
1980 debug_hooks = &xcoff_debug_hooks;
1982 #ifdef SDB_DEBUGGING_INFO
1983 else if (write_symbols == SDB_DEBUG)
1984 debug_hooks = &sdb_debug_hooks;
1986 #ifdef DWARF2_DEBUGGING_INFO
1987 else if (write_symbols == DWARF2_DEBUG)
1988 debug_hooks = &dwarf2_debug_hooks;
1990 #ifdef VMS_DEBUGGING_INFO
1991 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1992 debug_hooks = &vmsdbg_debug_hooks;
1995 error ("target system does not support the \"%s\" debug format",
1996 debug_type_names[write_symbols]);
1998 /* We know which debug output will be used so we can set flag_var_tracking
1999 and flag_var_tracking_uninit if the user has not specified them. */
2000 if (debug_info_level < DINFO_LEVEL_NORMAL
2001 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
2003 if (flag_var_tracking == 1
2004 || flag_var_tracking_uninit == 1)
2006 if (debug_info_level < DINFO_LEVEL_NORMAL)
2007 warning (0, "variable tracking requested, but useless unless "
2008 "producing debug info");
2010 warning (0, "variable tracking requested, but not supported "
2011 "by this debug format");
2013 flag_var_tracking = 0;
2014 flag_var_tracking_uninit = 0;
2017 /* If the user specifically requested variable tracking with tagging
2018 uninitialized variables, we need to turn on variable tracking.
2019 (We already determined above that variable tracking is feasible.) */
2020 if (flag_var_tracking_uninit)
2021 flag_var_tracking = 1;
2023 if (flag_var_tracking == AUTODETECT_VALUE)
2024 flag_var_tracking = optimize >= 1;
2026 if (flag_var_tracking_assignments == AUTODETECT_VALUE)
2027 flag_var_tracking_assignments = flag_var_tracking
2028 && !(flag_selective_scheduling || flag_selective_scheduling2);
2030 if (flag_var_tracking_assignments_toggle)
2031 flag_var_tracking_assignments = !flag_var_tracking_assignments;
2033 if (flag_var_tracking_assignments && !flag_var_tracking)
2034 flag_var_tracking = flag_var_tracking_assignments = -1;
2036 if (flag_var_tracking_assignments
2037 && (flag_selective_scheduling || flag_selective_scheduling2))
2038 warning (0, "var-tracking-assignments changes selective scheduling");
2040 if (flag_tree_cselim == AUTODETECT_VALUE)
2041 #ifdef HAVE_conditional_move
2042 flag_tree_cselim = 1;
2044 flag_tree_cselim = 0;
2047 /* If auxiliary info generation is desired, open the output file.
2048 This goes in the same directory as the source file--unlike
2049 all the other output files. */
2050 if (flag_gen_aux_info)
2052 aux_info_file = fopen (aux_info_file_name, "w");
2053 if (aux_info_file == 0)
2054 fatal_error ("can%'t open %s: %m", aux_info_file_name);
2057 if (! targetm.have_named_sections)
2059 if (flag_function_sections)
2061 warning (0, "-ffunction-sections not supported for this target");
2062 flag_function_sections = 0;
2064 if (flag_data_sections)
2066 warning (0, "-fdata-sections not supported for this target");
2067 flag_data_sections = 0;
2071 if (flag_function_sections && profile_flag)
2073 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
2074 flag_function_sections = 0;
2077 #ifndef HAVE_prefetch
2078 if (flag_prefetch_loop_arrays > 0)
2080 warning (0, "-fprefetch-loop-arrays not supported for this target");
2081 flag_prefetch_loop_arrays = 0;
2084 if (flag_prefetch_loop_arrays > 0 && !HAVE_prefetch)
2086 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
2087 flag_prefetch_loop_arrays = 0;
2091 /* This combination of options isn't handled for i386 targets and doesn't
2092 make much sense anyway, so don't allow it. */
2093 if (flag_prefetch_loop_arrays > 0 && optimize_size)
2095 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
2096 flag_prefetch_loop_arrays = 0;
2099 /* The presence of IEEE signaling NaNs, implies all math can trap. */
2100 if (flag_signaling_nans)
2101 flag_trapping_math = 1;
2103 /* We cannot reassociate if we want traps or signed zeros. */
2104 if (flag_associative_math && (flag_trapping_math || flag_signed_zeros))
2106 warning (0, "-fassociative-math disabled; other options take precedence");
2107 flag_associative_math = 0;
2110 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
2111 if (flag_cx_limited_range)
2112 flag_complex_method = 0;
2114 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
2115 if (flag_cx_fortran_rules)
2116 flag_complex_method = 1;
2118 /* Targets must be able to place spill slots at lower addresses. If the
2119 target already uses a soft frame pointer, the transition is trivial. */
2120 if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
2122 warning (0, "-fstack-protector not supported for this target");
2123 flag_stack_protect = 0;
2125 if (!flag_stack_protect)
2126 warn_stack_protect = 0;
2128 /* ??? Unwind info is not correct around the CFG unless either a frame
2129 pointer is present or A_O_A is set. Fixing this requires rewriting
2130 unwind info generation to be aware of the CFG and propagating states
2132 if (flag_unwind_tables && !ACCUMULATE_OUTGOING_ARGS
2133 && flag_omit_frame_pointer)
2135 warning (0, "unwind tables currently require a frame pointer "
2137 flag_omit_frame_pointer = 0;
2140 /* Save the current optimization options. */
2141 optimization_default_node = build_optimization_node ();
2142 optimization_current_node = optimization_default_node;
2145 /* This function can be called multiple times to reinitialize the compiler
2146 back end when register classes or instruction sets have changed,
2147 before each function. */
2149 backend_init_target (void)
2151 /* Initialize alignment variables. */
2154 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
2155 to initialize reg_raw_mode[]. */
2158 /* This invokes target hooks to set fixed_reg[] etc, which is
2162 /* This depends on stack_pointer_rtx. */
2163 init_fake_stack_mems ();
2165 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
2167 init_alias_target ();
2169 /* Depends on HARD_FRAME_POINTER_REGNUM. */
2172 /* The following initialization functions need to generate rtl, so
2173 provide a dummy function context for them. */
2174 init_dummy_function_start ();
2176 /* rtx_cost is mode-dependent, so cached values need to be recomputed
2177 on a mode change. */
2180 /* We may need to recompute regno_save_code[] and regno_restore_code[]
2181 after a mode change as well. */
2182 caller_save_initialized_p = false;
2184 expand_dummy_function_end ();
2187 /* Initialize the compiler back end. This function is called only once,
2188 when starting the compiler. */
2195 init_inline_once ();
2196 init_varasm_once ();
2197 save_register_info ();
2199 /* Initialize the target-specific back end pieces. */
2201 backend_init_target ();
2204 /* Initialize excess precision settings. */
2206 init_excess_precision (void)
2208 /* Adjust excess precision handling based on the target options. If
2209 the front end cannot handle it, flag_excess_precision_cmdline
2210 will already have been set accordingly in the post_options
2212 gcc_assert (flag_excess_precision_cmdline != EXCESS_PRECISION_DEFAULT);
2213 flag_excess_precision = flag_excess_precision_cmdline;
2214 if (flag_unsafe_math_optimizations)
2215 flag_excess_precision = EXCESS_PRECISION_FAST;
2216 if (flag_excess_precision == EXCESS_PRECISION_STANDARD)
2218 int flt_eval_method = TARGET_FLT_EVAL_METHOD;
2219 switch (flt_eval_method)
2223 /* Either the target acts unpredictably (-1) or has all the
2224 operations required not to have excess precision (0). */
2225 flag_excess_precision = EXCESS_PRECISION_FAST;
2229 /* In these cases, predictable excess precision makes
2233 /* Any other implementation-defined FLT_EVAL_METHOD values
2234 require the compiler to handle the associated excess
2235 precision rules in excess_precision_type. */
2241 /* Initialize things that are both lang-dependent and target-dependent.
2242 This function can be called more than once if target parameters change. */
2244 lang_dependent_init_target (void)
2246 /* This determines excess precision settings. */
2247 init_excess_precision ();
2249 /* This creates various _DECL nodes, so needs to be called after the
2250 front end is initialized. It also depends on the HAVE_xxx macros
2251 generated from the target machine description. */
2254 /* The following initialization functions need to generate rtl, so
2255 provide a dummy function context for them. */
2256 init_dummy_function_start ();
2258 /* Do the target-specific parts of expr initialization. */
2259 init_expr_target ();
2261 /* Although the actions of these functions are language-independent,
2262 they use optabs, so we cannot call them from backend_init. */
2266 expand_dummy_function_end ();
2269 /* Language-dependent initialization. Returns nonzero on success. */
2271 lang_dependent_init (const char *name)
2273 location_t save_loc = input_location;
2274 if (dump_base_name == 0)
2275 dump_base_name = name && name[0] ? name : "gccdump";
2277 /* Other front-end initialization. */
2278 input_location = BUILTINS_LOCATION;
2279 if (lang_hooks.init () == 0)
2281 input_location = save_loc;
2283 init_asm_output (name);
2285 /* If stack usage information is desired, open the output file. */
2286 if (flag_stack_usage)
2287 stack_usage_file = open_auxiliary_file ("su");
2289 /* This creates various _DECL nodes, so needs to be called after the
2290 front end is initialized. */
2293 /* Do the target-specific parts of the initialization. */
2294 lang_dependent_init_target ();
2296 /* If dbx symbol table desired, initialize writing it and output the
2297 predefined types. */
2298 timevar_push (TV_SYMOUT);
2300 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
2301 if (dwarf2out_do_frame ())
2302 dwarf2out_frame_init ();
2305 /* Now we have the correct original filename, we can initialize
2307 (*debug_hooks->init) (name);
2309 timevar_pop (TV_SYMOUT);
2315 /* Reinitialize everything when target parameters, such as register usage,
2318 target_reinit (void)
2320 /* Reinitialize RTL backend. */
2321 backend_init_target ();
2323 /* Reinitialize lang-dependent parts. */
2324 lang_dependent_init_target ();
2328 dump_memory_report (bool final)
2330 ggc_print_statistics ();
2331 stringpool_statistics ();
2332 dump_tree_statistics ();
2333 dump_gimple_statistics ();
2334 dump_rtx_statistics ();
2335 dump_alloc_pool_statistics ();
2336 dump_bitmap_statistics ();
2337 dump_vec_loc_statistics ();
2338 dump_ggc_loc_statistics (final);
2339 dump_alias_stats (stderr);
2340 dump_pta_stats (stderr);
2343 /* Clean up: close opened files, etc. */
2348 /* Close the dump files. */
2349 if (flag_gen_aux_info)
2351 fclose (aux_info_file);
2353 unlink (aux_info_file_name);
2356 /* Close non-debugging input and output files. Take special care to note
2357 whether fclose returns an error, since the pages might still be on the
2358 buffer chain while the file is open. */
2362 if (ferror (asm_out_file) != 0)
2363 fatal_error ("error writing to %s: %m", asm_file_name);
2364 if (fclose (asm_out_file) != 0)
2365 fatal_error ("error closing %s: %m", asm_file_name);
2367 unlink_if_ordinary (asm_file_name);
2370 if (stack_usage_file)
2371 fclose (stack_usage_file);
2374 finish_optimization_passes ();
2379 dump_memory_report (true);
2381 /* Language-specific end of compilation actions. */
2382 lang_hooks.finish ();
2385 /* Initialize the compiler, and compile the input file. */
2389 /* Initialize timing first. The C front ends read the main file in
2390 the post_options hook, and C++ does file timings. */
2391 if (time_report || !quiet_flag || flag_detailed_statistics)
2393 timevar_start (TV_TOTAL);
2397 /* Don't do any more if an error has already occurred. */
2400 /* This must be run always, because it is needed to compute the FP
2401 predefined macros, such as __LDBL_MAX__, for targets using non
2402 default FP formats. */
2403 init_adjust_machine_modes ();
2405 /* Set up the back-end if requested. */
2409 /* Language-dependent initialization. Returns true on success. */
2410 if (lang_dependent_init (main_input_filename))
2416 /* Stop timing and print the times. */
2417 timevar_stop (TV_TOTAL);
2418 timevar_print (stderr);
2421 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2422 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2423 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2425 It is not safe to call this function more than once. */
2428 toplev_main (int argc, char **argv)
2430 expandargv (&argc, &argv);
2432 /* Initialization of GCC's environment, and diagnostics. */
2433 general_init (argv[0]);
2435 /* Parse the options and do minimal processing; basically just
2436 enough to default flags appropriately. */
2437 decode_options (argc, CONST_CAST2 (const char **, char **, argv),
2438 &save_decoded_options, &save_decoded_options_count);
2442 initialize_plugins ();
2445 print_version (stderr, "");
2448 print_plugins_help (stderr, "");
2450 /* Exit early if we can (e.g. -help). */
2451 if (!exit_after_options)
2454 if (warningcount || errorcount)
2455 print_ignored_options ();
2456 diagnostic_finish (global_dc);
2458 /* Invoke registered plugin callbacks if any. */
2459 invoke_plugin_callbacks (PLUGIN_FINISH, NULL);
2461 finalize_plugins ();
2463 return (FATAL_EXIT_CODE);
2465 return (SUCCESS_EXIT_CODE);