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 /* Name of program invoked, sans directories. */
131 const char *progname;
133 /* Copy of argument vector to toplev_main. */
134 static const char **save_argv;
136 /* Name of top-level original source file (what was input to cpp).
137 This comes from the #-command at the beginning of the actual input.
138 If there isn't any there, then this is the cc1 input file name. */
140 const char *main_input_filename;
142 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
143 to optimize in process_options (). */
144 #define AUTODETECT_VALUE 2
146 /* Name to use as base of names for dump output files. */
148 const char *dump_base_name;
150 /* Directory used for dump output files. */
152 const char *dump_dir_name;
154 /* Name to use as a base for auxiliary output files. */
156 const char *aux_base_name;
158 /* Prefix for profile data files */
159 const char *profile_data_prefix;
161 /* A mask of target_flags that includes bit X if X was set or cleared
162 on the command line. */
164 int target_flags_explicit;
166 /* Debug hooks - dependent upon command line options. */
168 const struct gcc_debug_hooks *debug_hooks;
170 /* Other flags saying which kinds of debugging dump have been requested. */
172 int rtl_dump_and_exit;
173 int flag_print_asm_name;
174 enum graph_dump_types graph_dump_format;
176 /* Name for output file of assembly code, specified with -o. */
178 const char *asm_file_name;
180 /* Nonzero means do optimizations. -O.
181 Particular numeric values stand for particular amounts of optimization;
182 thus, -O2 stores 2 here. However, the optimizations beyond the basic
183 ones are not controlled directly by this variable. Instead, they are
184 controlled by individual `flag_...' variables that are defaulted
185 based on this variable. */
189 /* Nonzero means optimize for size. -Os.
190 The only valid values are zero and nonzero. When optimize_size is
191 nonzero, optimize defaults to 2, but certain individual code
192 bloating optimizations are disabled. */
194 int optimize_size = 0;
196 /* True if this is the lto front end. This is used to disable
197 gimple generation and lowering passes that are normally run on the
198 output of a front end. These passes must be bypassed for lto since
199 they have already been done before the gimple was written. */
201 bool in_lto_p = false;
203 /* Nonzero if we should write GIMPLE bytecode for link-time optimization. */
205 int flag_generate_lto;
207 /* The FUNCTION_DECL for the function currently being compiled,
208 or 0 if between functions. */
209 tree current_function_decl;
211 /* Set to the FUNC_BEGIN label of the current function, or NULL
213 const char * current_function_func_begin_label;
215 /* Nonzero means to collect statistics which might be expensive
216 and to print them when we are done. */
217 int flag_detailed_statistics = 0;
219 /* A random sequence of characters, unless overridden by user. */
220 static const char *flag_random_seed;
222 /* A local time stamp derived from the time of compilation. It will be
223 zero if the system cannot provide a time. It will be -1u, if the
224 user has specified a particular random seed. */
229 /* Nonzero means `char' should be signed. */
231 int flag_signed_char;
233 /* Nonzero means give an enum type only as many bytes as it needs. A value
234 of 2 means it has not yet been initialized. */
236 int flag_short_enums;
238 /* Nonzero if structures and unions should be returned in memory.
240 This should only be defined if compatibility with another compiler or
241 with an ABI is needed, because it results in slower code. */
243 #ifndef DEFAULT_PCC_STRUCT_RETURN
244 #define DEFAULT_PCC_STRUCT_RETURN 1
247 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
249 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
251 /* 0 means straightforward implementation of complex divide acceptable.
252 1 means wide ranges of inputs must work for complex divide.
253 2 means C99-like requirements for complex multiply and divide. */
255 int flag_complex_method = 1;
257 /* Nonzero means we should be saving declaration info into a .X file. */
259 int flag_gen_aux_info = 0;
261 /* Specified name of aux-info file. */
263 const char *aux_info_file_name;
265 /* Nonzero if we are compiling code for a shared library, zero for
270 /* Generate code for GNU or NeXT Objective-C runtime environment. */
272 #ifdef NEXT_OBJC_RUNTIME
273 int flag_next_runtime = 1;
275 int flag_next_runtime = 0;
278 /* Set to the default thread-local storage (tls) model to use. */
280 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
282 /* Set the default region and algorithm for the integrated register
285 enum ira_algorithm flag_ira_algorithm = IRA_ALGORITHM_CB;
286 enum ira_region flag_ira_region = IRA_REGION_MIXED;
288 /* Set the default value for -fira-verbose. */
290 unsigned int flag_ira_verbose = 5;
292 /* Set the default for excess precision. */
294 enum excess_precision flag_excess_precision_cmdline = EXCESS_PRECISION_DEFAULT;
295 enum excess_precision flag_excess_precision = EXCESS_PRECISION_DEFAULT;
297 /* Nonzero means change certain warnings into errors.
298 Usually these are warnings about failure to conform to some standard. */
300 int flag_pedantic_errors = 0;
302 /* Nonzero means make permerror produce warnings instead of errors. */
304 int flag_permissive = 0;
306 /* -dA causes debug commentary information to be produced in
307 the generated assembly code (to make it more readable). This option
308 is generally only of use to those who actually need to read the
309 generated assembly code (perhaps while debugging the compiler itself).
310 Currently, this switch is only used by dwarfout.c; however, it is intended
311 to be a catchall for printing debug information in the assembler file. */
313 int flag_debug_asm = 0;
315 /* -dP causes the rtl to be emitted as a comment in assembly. */
317 int flag_dump_rtl_in_asm = 0;
319 /* When non-NULL, indicates that whenever space is allocated on the
320 stack, the resulting stack pointer must not pass this
321 address---that is, for stacks that grow downward, the stack pointer
322 must always be greater than or equal to this address; for stacks
323 that grow upward, the stack pointer must be less than this address.
324 At present, the rtx may be either a REG or a SYMBOL_REF, although
325 the support provided depends on the backend. */
328 /* Positive if we should track variables, negative if we should run
329 the var-tracking pass only to discard debug annotations, zero if
330 we're not to run it. When flag_var_tracking == AUTODETECT_VALUE it
331 will be set according to optimize, debug_info_level and debug_hooks
332 in process_options (). */
333 int flag_var_tracking = AUTODETECT_VALUE;
335 /* Positive if we should track variables at assignments, negative if
336 we should run the var-tracking pass only to discard debug
337 annotations. When flag_var_tracking_assignments ==
338 AUTODETECT_VALUE it will be set according to flag_var_tracking. */
339 int flag_var_tracking_assignments = AUTODETECT_VALUE;
341 /* Nonzero if we should toggle flag_var_tracking_assignments after
342 processing options and computing its default. */
343 int flag_var_tracking_assignments_toggle = 0;
345 /* Type of stack check. */
346 enum stack_check_type flag_stack_check = NO_STACK_CHECK;
348 /* True if the user has tagged the function with the 'section'
351 bool user_defined_section_attribute = false;
353 /* Values of the -falign-* flags: how much to align labels in code.
354 0 means `use default', 1 means `don't align'.
355 For each variable, there is an _log variant which is the power
356 of two not less than the variable, for .align output. */
359 int align_loops_max_skip;
361 int align_jumps_max_skip;
362 int align_labels_log;
363 int align_labels_max_skip;
364 int align_functions_log;
368 const char *const string;
372 lang_independent_options;
374 /* Nonzero if subexpressions must be evaluated from left-to-right. */
375 int flag_evaluation_order = 0;
377 /* The user symbol prefix after having resolved same. */
378 const char *user_label_prefix;
380 static const param_info lang_independent_params[] = {
381 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
382 { OPTION, DEFAULT, false, MIN, MAX, HELP },
383 #include "params.def"
385 { NULL, 0, false, 0, 0, NULL }
388 /* Output files for assembler code (real compiler output)
389 and debugging dumps. */
393 FILE *dump_file = NULL;
394 const char *dump_file_name;
396 /* The current working directory of a translation. It's generally the
397 directory from which compilation was initiated, but a preprocessed
398 file may specify the original directory in which it was
401 static const char *src_pwd;
403 /* Initialize src_pwd with the given string, and return true. If it
404 was already initialized, return false. As a special case, it may
405 be called with a NULL argument to test whether src_pwd has NOT been
409 set_src_pwd (const char *pwd)
413 if (strcmp (src_pwd, pwd) == 0)
419 src_pwd = xstrdup (pwd);
423 /* Return the directory from which the translation unit was initiated,
424 in case set_src_pwd() was not called before to assign it a
440 /* Called when the start of a function definition is parsed,
441 this function prints on stderr the name of the function. */
443 announce_function (tree decl)
447 if (rtl_dump_and_exit)
448 fprintf (stderr, "%s ",
449 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl))));
451 fprintf (stderr, " %s",
452 identifier_to_locale (lang_hooks.decl_printable_name (decl, 2)));
454 pp_needs_newline (global_dc->printer) = true;
455 diagnostic_set_last_function (global_dc, (diagnostic_info *) NULL);
459 /* Initialize local_tick with the time of day, or -1 if
460 flag_random_seed is set. */
463 init_local_tick (void)
465 if (!flag_random_seed)
467 /* Get some more or less random data. */
468 #ifdef HAVE_GETTIMEOFDAY
472 gettimeofday (&tv, NULL);
473 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
477 time_t now = time (NULL);
479 if (now != (time_t)-1)
480 local_tick = (unsigned) now;
488 /* Set up a default flag_random_seed and local_tick, unless the user
489 already specified one. Must be called after init_local_tick. */
492 init_random_seed (void)
494 unsigned HOST_WIDE_INT value;
495 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
497 value = local_tick ^ getpid ();
499 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
500 flag_random_seed = random_seed;
503 /* Obtain the random_seed string. Unless NOINIT, initialize it if
504 it's not provided in the command line. */
507 get_random_seed (bool noinit)
509 if (!flag_random_seed && !noinit)
511 return flag_random_seed;
514 /* Modify the random_seed string to VAL. Return its previous
518 set_random_seed (const char *val)
520 const char *old = flag_random_seed;
521 flag_random_seed = val;
525 /* Decode the string P as an integral parameter.
526 If the string is indeed an integer return its numeric value else
527 issue an Invalid Option error for the option PNAME and return DEFVAL.
528 If PNAME is zero just return DEFVAL, do not call error. */
531 read_integral_parameter (const char *p, const char *pname, const int defval)
533 const char *endp = p;
546 error ("invalid option argument %qs", pname);
553 #if GCC_VERSION < 3004
555 /* The functions floor_log2 and exact_log2 are defined as inline
556 functions in toplev.h if GCC_VERSION >= 3004. The definitions here
557 are used for older versions of gcc. */
559 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
560 If X is 0, return -1. */
563 floor_log2 (unsigned HOST_WIDE_INT x)
570 if (HOST_BITS_PER_WIDE_INT > 64)
571 if (x >= (unsigned HOST_WIDE_INT) 1 << (t + 64))
573 if (HOST_BITS_PER_WIDE_INT > 32)
574 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 32))
576 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 16))
578 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 8))
580 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 4))
582 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 2))
584 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 1))
590 /* Return the logarithm of X, base 2, considering X unsigned,
591 if X is a power of 2. Otherwise, returns -1. */
594 exact_log2 (unsigned HOST_WIDE_INT x)
598 return floor_log2 (x);
601 #endif /* GCC_VERSION < 3004 */
603 /* Handler for fatal signals, such as SIGSEGV. These are transformed
604 into ICE messages, which is much more user friendly. In case the
605 error printer crashes, reset the signal to prevent infinite recursion. */
608 crash_signal (int signo)
610 signal (signo, SIG_DFL);
612 /* If we crashed while processing an ASM statement, then be a little more
613 graceful. It's most likely the user's fault. */
614 if (this_is_asm_operands)
616 output_operand_lossage ("unrecoverable error");
617 exit (FATAL_EXIT_CODE);
620 internal_error ("%s", strsignal (signo));
623 /* Arrange to dump core on error. (The regular error message is still
624 printed first, except in the case of abort().) */
627 setup_core_dumping (void)
630 signal (SIGABRT, SIG_DFL);
632 #if defined(HAVE_SETRLIMIT)
635 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
636 fatal_error ("getting core file size maximum limit: %m");
637 rlim.rlim_cur = rlim.rlim_max;
638 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
639 fatal_error ("setting core file size limit to maximum: %m");
642 diagnostic_abort_on_error (global_dc);
646 /* Strip off a legitimate source ending from the input string NAME of
647 length LEN. Rather than having to know the names used by all of
648 our front ends, we strip off an ending of a period followed by
649 up to five characters. (Java uses ".class".) */
652 strip_off_ending (char *name, int len)
655 for (i = 2; i < 6 && len > i; i++)
657 if (name[len - i] == '.')
659 name[len - i] = '\0';
665 /* Output a quoted string. */
668 output_quoted_string (FILE *asm_file, const char *string)
670 #ifdef OUTPUT_QUOTED_STRING
671 OUTPUT_QUOTED_STRING (asm_file, string);
675 putc ('\"', asm_file);
676 while ((c = *string++) != 0)
680 if (c == '\"' || c == '\\')
681 putc ('\\', asm_file);
685 fprintf (asm_file, "\\%03o", (unsigned char) c);
687 putc ('\"', asm_file);
691 /* Output a file name in the form wanted by System V. */
694 output_file_directive (FILE *asm_file, const char *input_name)
699 if (input_name == NULL)
700 input_name = "<stdin>";
702 input_name = remap_debug_filename (input_name);
704 len = strlen (input_name);
705 na = input_name + len;
707 /* NA gets INPUT_NAME sans directory names. */
708 while (na > input_name)
710 if (IS_DIR_SEPARATOR (na[-1]))
715 #ifdef ASM_OUTPUT_SOURCE_FILENAME
716 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
718 fprintf (asm_file, "\t.file\t");
719 output_quoted_string (asm_file, na);
720 putc ('\n', asm_file);
724 /* A subroutine of wrapup_global_declarations. We've come to the end of
725 the compilation unit. All deferred variables should be undeferred,
726 and all incomplete decls should be finalized. */
729 wrapup_global_declaration_1 (tree decl)
731 /* We're not deferring this any longer. Assignment is conditional to
732 avoid needlessly dirtying PCH pages. */
733 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl), TS_DECL_WITH_VIS)
734 && DECL_DEFER_OUTPUT (decl) != 0)
735 DECL_DEFER_OUTPUT (decl) = 0;
737 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
738 lang_hooks.finish_incomplete_decl (decl);
741 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
742 needs to be output. Return true if it is output. */
745 wrapup_global_declaration_2 (tree decl)
747 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
750 /* Don't write out static consts, unless we still need them.
752 We also keep static consts if not optimizing (for debugging),
753 unless the user specified -fno-keep-static-consts.
754 ??? They might be better written into the debug information.
755 This is possible when using DWARF.
757 A language processor that wants static constants to be always
758 written out (even if it is not used) is responsible for
759 calling rest_of_decl_compilation itself. E.g. the C front-end
760 calls rest_of_decl_compilation from finish_decl.
761 One motivation for this is that is conventional in some
762 environments to write things like:
763 static const char rcsid[] = "... version string ...";
764 intending to force the string to be in the executable.
766 A language processor that would prefer to have unneeded
767 static constants "optimized away" would just defer writing
768 them out until here. E.g. C++ does this, because static
769 constants are often defined in header files.
771 ??? A tempting alternative (for both C and C++) would be
772 to force a constant to be written if and only if it is
773 defined in a main file, as opposed to an include file. */
775 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
777 struct varpool_node *node;
779 node = varpool_node (decl);
783 else if (node->alias)
785 else if (!cgraph_global_info_ready
787 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
789 else if (node->needed)
791 else if (DECL_COMDAT (decl))
793 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
794 && (optimize || !flag_keep_static_consts
795 || DECL_ARTIFICIAL (decl)))
800 rest_of_decl_compilation (decl, 1, 1);
808 /* Do any final processing required for the declarations in VEC, of
809 which there are LEN. We write out inline functions and variables
810 that have been deferred until this point, but which are required.
811 Returns nonzero if anything was put out. */
814 wrapup_global_declarations (tree *vec, int len)
816 bool reconsider, output_something = false;
819 for (i = 0; i < len; i++)
820 wrapup_global_declaration_1 (vec[i]);
822 /* Now emit any global variables or functions that we have been
823 putting off. We need to loop in case one of the things emitted
824 here references another one which comes earlier in the list. */
828 for (i = 0; i < len; i++)
829 reconsider |= wrapup_global_declaration_2 (vec[i]);
831 output_something = true;
835 return output_something;
838 /* A subroutine of check_global_declarations. Issue appropriate warnings
839 for the global declaration DECL. */
842 check_global_declaration_1 (tree decl)
844 /* Warn about any function declared static but not defined. We don't
845 warn about variables, because many programs have static variables
846 that exist only to get some text into the object file. */
847 if (TREE_CODE (decl) == FUNCTION_DECL
848 && DECL_INITIAL (decl) == 0
849 && DECL_EXTERNAL (decl)
850 && ! DECL_ARTIFICIAL (decl)
851 && ! TREE_NO_WARNING (decl)
852 && ! TREE_PUBLIC (decl)
853 && (warn_unused_function
854 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
856 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
857 pedwarn (input_location, 0, "%q+F used but never defined", decl);
859 warning (OPT_Wunused_function, "%q+F declared %<static%> but never defined", decl);
860 /* This symbol is effectively an "extern" declaration now. */
861 TREE_PUBLIC (decl) = 1;
862 assemble_external (decl);
865 /* Warn about static fns or vars defined but not used. */
866 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
867 /* We don't warn about "static const" variables because the
868 "rcs_id" idiom uses that construction. */
869 || (warn_unused_variable
870 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
871 && ! DECL_IN_SYSTEM_HEADER (decl)
872 && ! TREE_USED (decl)
873 /* The TREE_USED bit for file-scope decls is kept in the identifier,
874 to handle multiple external decls in different scopes. */
875 && ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl)))
876 && ! DECL_EXTERNAL (decl)
877 && ! TREE_PUBLIC (decl)
878 /* A volatile variable might be used in some non-obvious way. */
879 && ! TREE_THIS_VOLATILE (decl)
880 /* Global register variables must be declared to reserve them. */
881 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
882 /* Otherwise, ask the language. */
883 && lang_hooks.decls.warn_unused_global (decl))
884 warning ((TREE_CODE (decl) == FUNCTION_DECL)
885 ? OPT_Wunused_function
886 : OPT_Wunused_variable,
887 "%q+D defined but not used", decl);
890 /* Issue appropriate warnings for the global declarations in VEC (of
891 which there are LEN). */
894 check_global_declarations (tree *vec, int len)
898 for (i = 0; i < len; i++)
899 check_global_declaration_1 (vec[i]);
902 /* Emit debugging information for all global declarations in VEC. */
905 emit_debug_global_declarations (tree *vec, int len)
909 /* Avoid confusing the debug information machinery when there are errors. */
910 if (errorcount != 0 || sorrycount != 0)
913 timevar_push (TV_SYMOUT);
914 for (i = 0; i < len; i++)
915 debug_hooks->global_decl (vec[i]);
916 timevar_pop (TV_SYMOUT);
919 /* Warn about a use of an identifier which was marked deprecated. */
921 warn_deprecated_use (tree node, tree attr)
925 if (node == 0 || !warn_deprecated_decl)
931 attr = DECL_ATTRIBUTES (node);
932 else if (TYPE_P (node))
934 tree decl = TYPE_STUB_DECL (node);
936 attr = lookup_attribute ("deprecated",
937 TYPE_ATTRIBUTES (TREE_TYPE (decl)));
942 attr = lookup_attribute ("deprecated", attr);
945 msg = TREE_STRING_POINTER (TREE_VALUE (TREE_VALUE (attr)));
951 expanded_location xloc = expand_location (DECL_SOURCE_LOCATION (node));
953 warning (OPT_Wdeprecated_declarations,
954 "%qD is deprecated (declared at %s:%d): %s",
955 node, xloc.file, xloc.line, msg);
957 warning (OPT_Wdeprecated_declarations,
958 "%qD is deprecated (declared at %s:%d)",
959 node, xloc.file, xloc.line);
961 else if (TYPE_P (node))
963 tree what = NULL_TREE;
964 tree decl = TYPE_STUB_DECL (node);
966 if (TYPE_NAME (node))
968 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
969 what = TYPE_NAME (node);
970 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
971 && DECL_NAME (TYPE_NAME (node)))
972 what = DECL_NAME (TYPE_NAME (node));
977 expanded_location xloc
978 = expand_location (DECL_SOURCE_LOCATION (decl));
982 warning (OPT_Wdeprecated_declarations,
983 "%qE is deprecated (declared at %s:%d): %s",
984 what, xloc.file, xloc.line, msg);
986 warning (OPT_Wdeprecated_declarations,
987 "%qE is deprecated (declared at %s:%d)", what,
988 xloc.file, xloc.line);
993 warning (OPT_Wdeprecated_declarations,
994 "type is deprecated (declared at %s:%d): %s",
995 xloc.file, xloc.line, msg);
997 warning (OPT_Wdeprecated_declarations,
998 "type is deprecated (declared at %s:%d)",
999 xloc.file, xloc.line);
1007 warning (OPT_Wdeprecated_declarations, "%qE is deprecated: %s",
1010 warning (OPT_Wdeprecated_declarations, "%qE is deprecated", what);
1015 warning (OPT_Wdeprecated_declarations, "type is deprecated: %s",
1018 warning (OPT_Wdeprecated_declarations, "type is deprecated");
1024 /* Compile an entire translation unit. Write a file of assembly
1025 output and various debugging dumps. */
1030 /* Initialize yet another pass. */
1032 ggc_protect_identifiers = true;
1035 init_final (main_input_filename);
1036 coverage_init (aux_base_name);
1038 invoke_plugin_callbacks (PLUGIN_START_UNIT, NULL);
1040 timevar_push (TV_PARSE);
1042 /* Call the parser, which parses the entire file (calling
1043 rest_of_compilation for each function). */
1044 lang_hooks.parse_file (set_yydebug);
1046 /* Compilation is now finished except for writing
1047 what's left of the symbol table output. */
1048 timevar_pop (TV_PARSE);
1050 if (flag_syntax_only || flag_wpa)
1053 ggc_protect_identifiers = false;
1055 /* This must also call cgraph_finalize_compilation_unit. */
1056 lang_hooks.decls.final_write_globals ();
1058 if (errorcount || sorrycount)
1061 /* Ensure that emulated TLS control vars are finalized and build
1062 a static constructor for them, when it is required. */
1063 if (!targetm.have_tls)
1066 varpool_assemble_pending_decls ();
1067 finish_aliases_2 ();
1069 /* Likewise for mudflap static object registrations. */
1071 mudflap_finish_file ();
1073 output_shared_constant_pool ();
1074 output_object_blocks ();
1076 /* Write out any pending weak symbol declarations. */
1079 /* This must be at the end before unwind and debug info.
1080 Some target ports emit PIC setup thunks here. */
1081 targetm.asm_out.code_end ();
1083 /* Do dbx symbols. */
1084 timevar_push (TV_SYMOUT);
1086 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
1087 if (dwarf2out_do_frame ())
1088 dwarf2out_frame_finish ();
1091 (*debug_hooks->finish) (main_input_filename);
1092 timevar_pop (TV_SYMOUT);
1094 /* Output some stuff at end of file if nec. */
1096 dw2_output_indirect_constants ();
1098 /* Flush any pending external directives. */
1099 process_pending_assemble_externals ();
1101 /* Emit LTO marker if LTO info has been previously emitted. This is
1102 used by collect2 to determine whether an object file contains IL.
1103 We used to emit an undefined reference here, but this produces
1104 link errors if an object file with IL is stored into a shared
1105 library without invoking lto1. */
1106 if (flag_generate_lto)
1108 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1109 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
1111 (unsigned HOST_WIDE_INT) 1, 8);
1112 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1113 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_v1",
1114 (unsigned HOST_WIDE_INT) 1, 8);
1116 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_v1",
1117 (unsigned HOST_WIDE_INT) 1,
1118 (unsigned HOST_WIDE_INT) 1);
1122 /* Attach a special .ident directive to the end of the file to identify
1123 the version of GCC which compiled this code. The format of the .ident
1124 string is patterned after the ones produced by native SVR4 compilers. */
1128 const char *pkg_version = "(GNU) ";
1130 if (strcmp ("(GCC) ", pkgversion_string))
1131 pkg_version = pkgversion_string;
1132 fprintf (asm_out_file, "%s\"GCC: %s%s\"\n",
1133 IDENT_ASM_OP, pkg_version, version_string);
1137 /* Invoke registered plugin callbacks. */
1138 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT, NULL);
1140 /* This must be at the end. Some target ports emit end of file directives
1141 into the assembly file here, and hence we can not output anything to the
1142 assembly file after this point. */
1143 targetm.asm_out.file_end ();
1146 /* Parse a -d... command line switch. */
1149 decode_d_option (const char *arg)
1160 flag_print_asm_name = 1;
1163 flag_dump_rtl_in_asm = 1;
1164 flag_print_asm_name = 1;
1167 graph_dump_format = vcg;
1170 rtl_dump_and_exit = 1;
1175 case 'D': /* These are handled by the preprocessor. */
1182 setup_core_dumping();
1185 enable_rtl_dump_file ();
1189 warning (0, "unrecognized gcc debugging option: %c", c);
1194 /* Indexed by enum debug_info_type. */
1195 const char *const debug_type_names[] =
1197 "none", "stabs", "coff", "dwarf-2", "xcoff", "vms"
1200 /* Print version information to FILE.
1201 Each line begins with INDENT (for the case where FILE is the
1202 assembler output file). */
1205 print_version (FILE *file, const char *indent)
1207 static const char fmt1[] =
1209 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
1211 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
1214 static const char fmt2[] =
1215 N_("GMP version %s, MPFR version %s, MPC version %s\n");
1216 static const char fmt3[] =
1217 N_("%s%swarning: %s header version %s differs from library version %s.\n");
1218 static const char fmt4[] =
1219 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
1221 #define __VERSION__ "[?]"
1224 file == stderr ? _(fmt1) : fmt1,
1225 indent, *indent != 0 ? " " : "",
1226 lang_hooks.name, pkgversion_string, version_string, TARGET_NAME,
1227 indent, __VERSION__);
1229 /* We need to stringify the GMP macro values. Ugh, gmp_version has
1230 two string formats, "i.j.k" and "i.j" when k is zero. As of
1231 gmp-4.3.0, GMP always uses the 3 number format. */
1232 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
1233 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3(X)
1234 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
1235 #define GCC_GMP_VERSION \
1236 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
1237 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
1238 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
1239 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR)
1241 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
1242 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) "." \
1243 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_PATCHLEVEL)
1246 file == stderr ? _(fmt2) : fmt2,
1247 GCC_GMP_STRINGIFY_VERSION, MPFR_VERSION_STRING, MPC_VERSION_STRING);
1248 if (strcmp (GCC_GMP_STRINGIFY_VERSION, gmp_version))
1250 file == stderr ? _(fmt3) : fmt3,
1251 indent, *indent != 0 ? " " : "",
1252 "GMP", GCC_GMP_STRINGIFY_VERSION, gmp_version);
1253 if (strcmp (MPFR_VERSION_STRING, mpfr_get_version ()))
1255 file == stderr ? _(fmt3) : fmt3,
1256 indent, *indent != 0 ? " " : "",
1257 "MPFR", MPFR_VERSION_STRING, mpfr_get_version ());
1258 if (strcmp (MPC_VERSION_STRING, mpc_get_version ()))
1260 file == stderr ? _(fmt3) : fmt3,
1261 indent, *indent != 0 ? " " : "",
1262 "MPC", MPC_VERSION_STRING, mpc_get_version ());
1264 file == stderr ? _(fmt4) : fmt4,
1265 indent, *indent != 0 ? " " : "",
1266 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
1268 print_plugins_versions (file, indent);
1271 #ifdef ASM_COMMENT_START
1273 print_to_asm_out_file (print_switch_type type, const char * text)
1275 bool prepend_sep = true;
1279 case SWITCH_TYPE_LINE_END:
1280 putc ('\n', asm_out_file);
1283 case SWITCH_TYPE_LINE_START:
1284 fputs (ASM_COMMENT_START, asm_out_file);
1285 return strlen (ASM_COMMENT_START);
1287 case SWITCH_TYPE_DESCRIPTIVE:
1288 if (ASM_COMMENT_START[0] == 0)
1289 prepend_sep = false;
1291 case SWITCH_TYPE_PASSED:
1292 case SWITCH_TYPE_ENABLED:
1294 fputc (' ', asm_out_file);
1295 fputs (text, asm_out_file);
1296 /* No need to return the length here as
1297 print_single_switch has already done it. */
1307 print_to_stderr (print_switch_type type, const char * text)
1311 case SWITCH_TYPE_LINE_END:
1312 putc ('\n', stderr);
1315 case SWITCH_TYPE_LINE_START:
1318 case SWITCH_TYPE_PASSED:
1319 case SWITCH_TYPE_ENABLED:
1320 fputc (' ', stderr);
1323 case SWITCH_TYPE_DESCRIPTIVE:
1324 fputs (text, stderr);
1325 /* No need to return the length here as
1326 print_single_switch has already done it. */
1334 /* Print an option value and return the adjusted position in the line.
1335 ??? print_fn doesn't handle errors, eg disk full; presumably other
1336 code will catch a disk full though. */
1339 print_single_switch (print_switch_fn_type print_fn,
1341 print_switch_type type,
1344 /* The ultrix fprintf returns 0 on success, so compute the result
1345 we want here since we need it for the following test. The +1
1346 is for the separator character that will probably be emitted. */
1347 int len = strlen (text) + 1;
1350 && pos + len > MAX_LINE)
1352 print_fn (SWITCH_TYPE_LINE_END, NULL);
1357 pos += print_fn (SWITCH_TYPE_LINE_START, NULL);
1359 print_fn (type, text);
1363 /* Print active target switches using PRINT_FN.
1364 POS is the current cursor position and MAX is the size of a "line".
1365 Each line begins with INDENT and ends with TERM.
1366 Each switch is separated from the next by SEP. */
1369 print_switch_values (print_switch_fn_type print_fn)
1375 /* Fill in the -frandom-seed option, if the user didn't pass it, so
1376 that it can be printed below. This helps reproducibility. */
1377 if (!flag_random_seed)
1378 init_random_seed ();
1380 /* Print the options as passed. */
1381 pos = print_single_switch (print_fn, pos,
1382 SWITCH_TYPE_DESCRIPTIVE, _("options passed: "));
1384 for (p = &save_argv[1]; *p != NULL; p++)
1389 if (strcmp (*p, "-o") == 0
1390 || strcmp (*p, "-dumpbase") == 0
1391 || strcmp (*p, "-dumpdir") == 0
1392 || strcmp (*p, "-auxbase") == 0)
1399 if (strcmp (*p, "-quiet") == 0
1400 || strcmp (*p, "-version") == 0)
1407 pos = print_single_switch (print_fn, pos, SWITCH_TYPE_PASSED, *p);
1411 print_fn (SWITCH_TYPE_LINE_END, NULL);
1413 /* Print the -f and -m options that have been enabled.
1414 We don't handle language specific options but printing argv
1416 pos = print_single_switch (print_fn, 0,
1417 SWITCH_TYPE_DESCRIPTIVE, _("options enabled: "));
1419 for (j = 0; j < cl_options_count; j++)
1420 if ((cl_options[j].flags & CL_REPORT)
1421 && option_enabled (j) > 0)
1422 pos = print_single_switch (print_fn, pos,
1423 SWITCH_TYPE_ENABLED, cl_options[j].opt_text);
1425 print_fn (SWITCH_TYPE_LINE_END, NULL);
1428 /* Open assembly code output file. Do this even if -fsyntax-only is
1429 on, because then the driver will have provided the name of a
1430 temporary file or bit bucket for us. NAME is the file specified on
1431 the command line, possibly NULL. */
1433 init_asm_output (const char *name)
1435 if (name == NULL && asm_file_name == 0)
1436 asm_out_file = stdout;
1439 if (asm_file_name == 0)
1441 int len = strlen (dump_base_name);
1442 char *dumpname = XNEWVEC (char, len + 6);
1444 memcpy (dumpname, dump_base_name, len + 1);
1445 strip_off_ending (dumpname, len);
1446 strcat (dumpname, ".s");
1447 asm_file_name = dumpname;
1449 if (!strcmp (asm_file_name, "-"))
1450 asm_out_file = stdout;
1452 asm_out_file = fopen (asm_file_name, "w+b");
1453 if (asm_out_file == 0)
1454 fatal_error ("can%'t open %s for writing: %m", asm_file_name);
1457 if (!flag_syntax_only)
1459 targetm.asm_out.file_start ();
1461 if (flag_record_gcc_switches)
1463 if (targetm.asm_out.record_gcc_switches)
1465 /* Let the target know that we are about to start recording. */
1466 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
1468 /* Now record the switches. */
1469 print_switch_values (targetm.asm_out.record_gcc_switches);
1470 /* Let the target know that the recording is over. */
1471 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
1475 inform (input_location, "-frecord-gcc-switches is not supported by the current target");
1478 #ifdef ASM_COMMENT_START
1479 if (flag_verbose_asm)
1481 /* Print the list of switches in effect
1482 into the assembler file as comments. */
1483 print_version (asm_out_file, ASM_COMMENT_START);
1484 print_switch_values (print_to_asm_out_file);
1485 putc ('\n', asm_out_file);
1491 /* Return true if the state of option OPTION should be stored in PCH files
1492 and checked by default_pch_valid_p. Store the option's current state
1496 option_affects_pch_p (int option, struct cl_option_state *state)
1498 if ((cl_options[option].flags & CL_TARGET) == 0)
1500 if (cl_options[option].flag_var == &target_flags)
1501 if (targetm.check_pch_target_flags)
1503 return get_option_state (option, state);
1506 /* Default version of get_pch_validity.
1507 By default, every flag difference is fatal; that will be mostly right for
1508 most targets, but completely right for very few. */
1511 default_get_pch_validity (size_t *sz)
1513 struct cl_option_state state;
1518 if (targetm.check_pch_target_flags)
1519 *sz += sizeof (target_flags);
1520 for (i = 0; i < cl_options_count; i++)
1521 if (option_affects_pch_p (i, &state))
1524 result = r = XNEWVEC (char, *sz);
1528 if (targetm.check_pch_target_flags)
1530 memcpy (r, &target_flags, sizeof (target_flags));
1531 r += sizeof (target_flags);
1534 for (i = 0; i < cl_options_count; i++)
1535 if (option_affects_pch_p (i, &state))
1537 memcpy (r, state.data, state.size);
1544 /* Return a message which says that a PCH file was created with a different
1545 setting of OPTION. */
1548 pch_option_mismatch (const char *option)
1552 asprintf (&r, _("created and used with differing settings of '%s'"), option);
1554 return _("out of memory");
1558 /* Default version of pch_valid_p. */
1561 default_pch_valid_p (const void *data_p, size_t len)
1563 struct cl_option_state state;
1564 const char *data = (const char *)data_p;
1567 /* -fpic and -fpie also usually make a PCH invalid. */
1568 if (data[0] != flag_pic)
1569 return _("created and used with different settings of -fpic");
1570 if (data[1] != flag_pie)
1571 return _("created and used with different settings of -fpie");
1574 /* Check target_flags. */
1575 if (targetm.check_pch_target_flags)
1580 memcpy (&tf, data, sizeof (target_flags));
1581 data += sizeof (target_flags);
1582 len -= sizeof (target_flags);
1583 r = targetm.check_pch_target_flags (tf);
1588 for (i = 0; i < cl_options_count; i++)
1589 if (option_affects_pch_p (i, &state))
1591 if (memcmp (data, state.data, state.size) != 0)
1592 return pch_option_mismatch (cl_options[i].opt_text);
1600 /* Default tree printer. Handles declarations only. */
1602 default_tree_printer (pretty_printer *pp, text_info *text, const char *spec,
1603 int precision, bool wide, bool set_locus, bool hash)
1607 /* FUTURE: %+x should set the locus. */
1608 if (precision != 0 || wide || hash)
1614 t = va_arg (*text->args_ptr, tree);
1615 if (TREE_CODE (t) == IDENTIFIER_NODE)
1617 pp_identifier (pp, IDENTIFIER_POINTER (t));
1623 t = va_arg (*text->args_ptr, tree);
1624 if (DECL_DEBUG_EXPR_IS_FROM (t) && DECL_DEBUG_EXPR (t))
1625 t = DECL_DEBUG_EXPR (t);
1630 t = va_arg (*text->args_ptr, tree);
1634 percent_K_format (text);
1641 if (set_locus && text->locus)
1642 *text->locus = DECL_SOURCE_LOCATION (t);
1646 const char *n = DECL_NAME (t)
1647 ? identifier_to_locale (lang_hooks.decl_printable_name (t, 2))
1652 dump_generic_node (pp, t, 0, TDF_DIAGNOSTIC, 0);
1657 /* A helper function; used as the reallocator function for cpp's line
1660 realloc_for_line_map (void *ptr, size_t len)
1662 return ggc_realloc (ptr, len);
1665 /* A helper function: used as the allocator function for
1666 identifier_to_locale. */
1668 alloc_for_identifier_to_locale (size_t len)
1670 return ggc_alloc (len);
1673 /* Initialization of the front end environment, before command line
1674 options are parsed. Signal handlers, internationalization etc.
1675 ARGV0 is main's argv[0]. */
1677 general_init (const char *argv0)
1681 p = argv0 + strlen (argv0);
1682 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1686 xmalloc_set_program_name (progname);
1690 /* Unlock the stdio streams. */
1691 unlock_std_streams ();
1693 gcc_init_libintl ();
1695 identifier_to_locale_alloc = alloc_for_identifier_to_locale;
1696 identifier_to_locale_free = ggc_free;
1698 /* Initialize the diagnostics reporting machinery, so option parsing
1699 can give warnings and errors. */
1700 diagnostic_initialize (global_dc, N_OPTS);
1701 diagnostic_starter (global_dc) = default_tree_diagnostic_starter;
1702 /* Set a default printer. Language specific initializations will
1703 override it later. */
1704 pp_format_decoder (global_dc->printer) = &default_tree_printer;
1705 global_dc->show_option_requested = flag_diagnostics_show_option;
1706 global_dc->show_column = flag_show_column;
1707 global_dc->internal_error = plugins_internal_error_function;
1708 global_dc->option_enabled = option_enabled;
1709 global_dc->option_name = option_name;
1711 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1713 signal (SIGSEGV, crash_signal);
1716 signal (SIGILL, crash_signal);
1719 signal (SIGBUS, crash_signal);
1722 signal (SIGABRT, crash_signal);
1724 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1725 signal (SIGIOT, crash_signal);
1728 signal (SIGFPE, crash_signal);
1731 /* Other host-specific signal setup. */
1732 (*host_hooks.extra_signals)();
1734 /* Initialize the garbage-collector, string pools and tree type hash
1738 line_table = GGC_NEW (struct line_maps);
1739 linemap_init (line_table);
1740 line_table->reallocator = realloc_for_line_map;
1743 /* Initialize register usage now so switches may override. */
1746 /* Register the language-independent parameters. */
1747 add_params (lang_independent_params, LAST_PARAM);
1749 /* This must be done after add_params but before argument processing. */
1750 init_ggc_heuristics();
1751 init_optimization_passes ();
1752 statistics_early_init ();
1755 /* Return true if the current target supports -fsection-anchors. */
1758 target_supports_section_anchors_p (void)
1760 if (targetm.min_anchor_offset == 0 && targetm.max_anchor_offset == 0)
1763 if (targetm.asm_out.output_anchor == NULL)
1769 /* Default the align_* variables to 1 if they're still unset, and
1770 set up the align_*_log variables. */
1772 init_alignments (void)
1774 if (align_loops <= 0)
1776 if (align_loops_max_skip > align_loops)
1777 align_loops_max_skip = align_loops - 1;
1778 align_loops_log = floor_log2 (align_loops * 2 - 1);
1779 if (align_jumps <= 0)
1781 if (align_jumps_max_skip > align_jumps)
1782 align_jumps_max_skip = align_jumps - 1;
1783 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1784 if (align_labels <= 0)
1786 align_labels_log = floor_log2 (align_labels * 2 - 1);
1787 if (align_labels_max_skip > align_labels)
1788 align_labels_max_skip = align_labels - 1;
1789 if (align_functions <= 0)
1790 align_functions = 1;
1791 align_functions_log = floor_log2 (align_functions * 2 - 1);
1794 /* Process the options that have been parsed. */
1796 process_options (void)
1798 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1799 This can happen with incorrect pre-processed input. */
1800 debug_hooks = &do_nothing_debug_hooks;
1802 /* This replaces set_Wunused. */
1803 if (warn_unused_function == -1)
1804 warn_unused_function = warn_unused;
1805 if (warn_unused_label == -1)
1806 warn_unused_label = warn_unused;
1807 /* Wunused-parameter is enabled if both -Wunused -Wextra are enabled. */
1808 if (warn_unused_parameter == -1)
1809 warn_unused_parameter = (warn_unused && extra_warnings);
1810 if (warn_unused_variable == -1)
1811 warn_unused_variable = warn_unused;
1812 /* Wunused-but-set-parameter is enabled if both -Wunused -Wextra are
1814 if (warn_unused_but_set_parameter == -1)
1815 warn_unused_but_set_parameter = (warn_unused && extra_warnings);
1816 if (warn_unused_but_set_variable == -1)
1817 warn_unused_but_set_variable = warn_unused;
1818 if (warn_unused_value == -1)
1819 warn_unused_value = warn_unused;
1821 /* This replaces set_Wextra. */
1822 if (warn_uninitialized == -1)
1823 warn_uninitialized = extra_warnings;
1825 /* Allow the front end to perform consistency checks and do further
1826 initialization based on the command line options. This hook also
1827 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1828 so we can correctly initialize debug output. */
1829 no_backend = lang_hooks.post_options (&main_input_filename);
1831 #ifdef OVERRIDE_OPTIONS
1832 /* Some machines may reject certain combinations of options. */
1836 /* Avoid any informative notes in the second run of -fcompare-debug. */
1837 if (flag_compare_debug)
1838 diagnostic_inhibit_notes (global_dc);
1840 if (flag_section_anchors && !target_supports_section_anchors_p ())
1842 warning (OPT_fsection_anchors,
1843 "this target does not support %qs", "-fsection-anchors");
1844 flag_section_anchors = 0;
1847 if (flag_short_enums == 2)
1848 flag_short_enums = targetm.default_short_enums ();
1850 /* Set aux_base_name if not already set. */
1853 else if (main_input_filename)
1855 char *name = xstrdup (lbasename (main_input_filename));
1857 strip_off_ending (name, strlen (name));
1858 aux_base_name = name;
1861 aux_base_name = "gccaux";
1866 || flag_loop_interchange
1867 || flag_loop_strip_mine
1868 || flag_graphite_identity
1869 || flag_loop_parallelize_all)
1870 sorry ("Graphite loop optimizations cannot be used");
1873 /* Unrolling all loops implies that standard loop unrolling must also
1875 if (flag_unroll_all_loops)
1876 flag_unroll_loops = 1;
1878 /* The loop unrolling code assumes that cse will be run after loop.
1879 web and rename-registers also help when run after loop unrolling. */
1880 if (flag_rerun_cse_after_loop == AUTODETECT_VALUE)
1881 flag_rerun_cse_after_loop = flag_unroll_loops || flag_peel_loops;
1883 if (flag_web == AUTODETECT_VALUE)
1884 flag_web = flag_unroll_loops || flag_peel_loops;
1886 if (flag_rename_registers == AUTODETECT_VALUE)
1887 flag_rename_registers = flag_unroll_loops || flag_peel_loops;
1889 if (flag_non_call_exceptions)
1890 flag_asynchronous_unwind_tables = 1;
1891 if (flag_asynchronous_unwind_tables)
1892 flag_unwind_tables = 1;
1894 if (flag_value_profile_transformations)
1895 flag_profile_values = 1;
1897 /* Warn about options that are not supported on this machine. */
1898 #ifndef INSN_SCHEDULING
1899 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1900 warning (0, "instruction scheduling not supported on this target machine");
1903 if (flag_delayed_branch)
1904 warning (0, "this target machine does not have delayed branches");
1907 user_label_prefix = USER_LABEL_PREFIX;
1908 if (flag_leading_underscore != -1)
1910 /* If the default prefix is more complicated than "" or "_",
1911 issue a warning and ignore this option. */
1912 if (user_label_prefix[0] == 0 ||
1913 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1915 user_label_prefix = flag_leading_underscore ? "_" : "";
1918 warning (0, "-f%sleading-underscore not supported on this target machine",
1919 flag_leading_underscore ? "" : "no-");
1922 /* If we are in verbose mode, write out the version and maybe all the
1923 option flags in use. */
1926 print_version (stderr, "");
1928 print_switch_values (print_to_stderr);
1931 if (flag_syntax_only)
1933 write_symbols = NO_DEBUG;
1939 if (debug_info_level == DINFO_LEVEL_NONE)
1941 debug_info_level = DINFO_LEVEL_NORMAL;
1943 if (write_symbols == NO_DEBUG)
1944 write_symbols = PREFERRED_DEBUGGING_TYPE;
1947 debug_info_level = DINFO_LEVEL_NONE;
1950 if (flag_dump_final_insns && !flag_syntax_only && !no_backend)
1952 FILE *final_output = fopen (flag_dump_final_insns, "w");
1955 error ("could not open final insn dump file %qs: %s",
1956 flag_dump_final_insns, strerror (errno));
1957 flag_dump_final_insns = NULL;
1959 else if (fclose (final_output))
1961 error ("could not close zeroed insn dump file %qs: %s",
1962 flag_dump_final_insns, strerror (errno));
1963 flag_dump_final_insns = NULL;
1967 /* Unless over-ridden for the target, assume that all DWARF levels
1968 may be emitted, if DWARF2_DEBUG is selected. */
1969 if (dwarf_strict < 0)
1972 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1974 if (debug_info_level == DINFO_LEVEL_NONE)
1975 write_symbols = NO_DEBUG;
1977 if (write_symbols == NO_DEBUG)
1979 #if defined(DBX_DEBUGGING_INFO)
1980 else if (write_symbols == DBX_DEBUG)
1981 debug_hooks = &dbx_debug_hooks;
1983 #if defined(XCOFF_DEBUGGING_INFO)
1984 else if (write_symbols == XCOFF_DEBUG)
1985 debug_hooks = &xcoff_debug_hooks;
1987 #ifdef SDB_DEBUGGING_INFO
1988 else if (write_symbols == SDB_DEBUG)
1989 debug_hooks = &sdb_debug_hooks;
1991 #ifdef DWARF2_DEBUGGING_INFO
1992 else if (write_symbols == DWARF2_DEBUG)
1993 debug_hooks = &dwarf2_debug_hooks;
1995 #ifdef VMS_DEBUGGING_INFO
1996 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1997 debug_hooks = &vmsdbg_debug_hooks;
2000 error ("target system does not support the \"%s\" debug format",
2001 debug_type_names[write_symbols]);
2003 /* We know which debug output will be used so we can set flag_var_tracking
2004 and flag_var_tracking_uninit if the user has not specified them. */
2005 if (debug_info_level < DINFO_LEVEL_NORMAL
2006 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
2008 if (flag_var_tracking == 1
2009 || flag_var_tracking_uninit == 1)
2011 if (debug_info_level < DINFO_LEVEL_NORMAL)
2012 warning (0, "variable tracking requested, but useless unless "
2013 "producing debug info");
2015 warning (0, "variable tracking requested, but not supported "
2016 "by this debug format");
2018 flag_var_tracking = 0;
2019 flag_var_tracking_uninit = 0;
2022 /* If the user specifically requested variable tracking with tagging
2023 uninitialized variables, we need to turn on variable tracking.
2024 (We already determined above that variable tracking is feasible.) */
2025 if (flag_var_tracking_uninit)
2026 flag_var_tracking = 1;
2028 if (flag_var_tracking == AUTODETECT_VALUE)
2029 flag_var_tracking = optimize >= 1;
2031 if (flag_var_tracking_assignments == AUTODETECT_VALUE)
2032 flag_var_tracking_assignments = flag_var_tracking
2033 && !(flag_selective_scheduling || flag_selective_scheduling2);
2035 if (flag_var_tracking_assignments_toggle)
2036 flag_var_tracking_assignments = !flag_var_tracking_assignments;
2038 if (flag_var_tracking_assignments && !flag_var_tracking)
2039 flag_var_tracking = flag_var_tracking_assignments = -1;
2041 if (flag_var_tracking_assignments
2042 && (flag_selective_scheduling || flag_selective_scheduling2))
2043 warning (0, "var-tracking-assignments changes selective scheduling");
2045 if (flag_tree_cselim == AUTODETECT_VALUE)
2046 #ifdef HAVE_conditional_move
2047 flag_tree_cselim = 1;
2049 flag_tree_cselim = 0;
2052 /* If auxiliary info generation is desired, open the output file.
2053 This goes in the same directory as the source file--unlike
2054 all the other output files. */
2055 if (flag_gen_aux_info)
2057 aux_info_file = fopen (aux_info_file_name, "w");
2058 if (aux_info_file == 0)
2059 fatal_error ("can%'t open %s: %m", aux_info_file_name);
2062 if (! targetm.have_named_sections)
2064 if (flag_function_sections)
2066 warning (0, "-ffunction-sections not supported for this target");
2067 flag_function_sections = 0;
2069 if (flag_data_sections)
2071 warning (0, "-fdata-sections not supported for this target");
2072 flag_data_sections = 0;
2076 if (flag_function_sections && profile_flag)
2078 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
2079 flag_function_sections = 0;
2082 #ifndef HAVE_prefetch
2083 if (flag_prefetch_loop_arrays)
2085 warning (0, "-fprefetch-loop-arrays not supported for this target");
2086 flag_prefetch_loop_arrays = 0;
2089 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
2091 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
2092 flag_prefetch_loop_arrays = 0;
2096 /* This combination of options isn't handled for i386 targets and doesn't
2097 make much sense anyway, so don't allow it. */
2098 if (flag_prefetch_loop_arrays && optimize_size)
2100 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
2101 flag_prefetch_loop_arrays = 0;
2104 /* The presence of IEEE signaling NaNs, implies all math can trap. */
2105 if (flag_signaling_nans)
2106 flag_trapping_math = 1;
2108 /* We cannot reassociate if we want traps or signed zeros. */
2109 if (flag_associative_math && (flag_trapping_math || flag_signed_zeros))
2111 warning (0, "-fassociative-math disabled; other options take precedence");
2112 flag_associative_math = 0;
2115 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
2116 if (flag_cx_limited_range)
2117 flag_complex_method = 0;
2119 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
2120 if (flag_cx_fortran_rules)
2121 flag_complex_method = 1;
2123 /* Targets must be able to place spill slots at lower addresses. If the
2124 target already uses a soft frame pointer, the transition is trivial. */
2125 if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
2127 warning (0, "-fstack-protector not supported for this target");
2128 flag_stack_protect = 0;
2130 if (!flag_stack_protect)
2131 warn_stack_protect = 0;
2133 /* ??? Unwind info is not correct around the CFG unless either a frame
2134 pointer is present or A_O_A is set. Fixing this requires rewriting
2135 unwind info generation to be aware of the CFG and propagating states
2137 if (flag_unwind_tables && !ACCUMULATE_OUTGOING_ARGS
2138 && flag_omit_frame_pointer)
2140 warning (0, "unwind tables currently require a frame pointer "
2142 flag_omit_frame_pointer = 0;
2145 /* Save the current optimization options. */
2146 optimization_default_node = build_optimization_node ();
2147 optimization_current_node = optimization_default_node;
2150 /* This function can be called multiple times to reinitialize the compiler
2151 back end when register classes or instruction sets have changed,
2152 before each function. */
2154 backend_init_target (void)
2156 /* Initialize alignment variables. */
2159 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
2160 to initialize reg_raw_mode[]. */
2163 /* This invokes target hooks to set fixed_reg[] etc, which is
2167 /* This depends on stack_pointer_rtx. */
2168 init_fake_stack_mems ();
2170 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
2172 init_alias_target ();
2174 /* Depends on HARD_FRAME_POINTER_REGNUM. */
2177 /* The following initialization functions need to generate rtl, so
2178 provide a dummy function context for them. */
2179 init_dummy_function_start ();
2181 /* rtx_cost is mode-dependent, so cached values need to be recomputed
2182 on a mode change. */
2185 /* We may need to recompute regno_save_code[] and regno_restore_code[]
2186 after a mode change as well. */
2187 caller_save_initialized_p = false;
2189 expand_dummy_function_end ();
2192 /* Initialize the compiler back end. This function is called only once,
2193 when starting the compiler. */
2200 init_inline_once ();
2201 init_varasm_once ();
2202 save_register_info ();
2204 /* Initialize the target-specific back end pieces. */
2206 backend_init_target ();
2209 /* Initialize excess precision settings. */
2211 init_excess_precision (void)
2213 /* Adjust excess precision handling based on the target options. If
2214 the front end cannot handle it, flag_excess_precision_cmdline
2215 will already have been set accordingly in the post_options
2217 gcc_assert (flag_excess_precision_cmdline != EXCESS_PRECISION_DEFAULT);
2218 flag_excess_precision = flag_excess_precision_cmdline;
2219 if (flag_unsafe_math_optimizations)
2220 flag_excess_precision = EXCESS_PRECISION_FAST;
2221 if (flag_excess_precision == EXCESS_PRECISION_STANDARD)
2223 int flt_eval_method = TARGET_FLT_EVAL_METHOD;
2224 switch (flt_eval_method)
2228 /* Either the target acts unpredictably (-1) or has all the
2229 operations required not to have excess precision (0). */
2230 flag_excess_precision = EXCESS_PRECISION_FAST;
2234 /* In these cases, predictable excess precision makes
2238 /* Any other implementation-defined FLT_EVAL_METHOD values
2239 require the compiler to handle the associated excess
2240 precision rules in excess_precision_type. */
2246 /* Initialize things that are both lang-dependent and target-dependent.
2247 This function can be called more than once if target parameters change. */
2249 lang_dependent_init_target (void)
2251 /* This determines excess precision settings. */
2252 init_excess_precision ();
2254 /* This creates various _DECL nodes, so needs to be called after the
2255 front end is initialized. It also depends on the HAVE_xxx macros
2256 generated from the target machine description. */
2259 /* The following initialization functions need to generate rtl, so
2260 provide a dummy function context for them. */
2261 init_dummy_function_start ();
2263 /* Do the target-specific parts of expr initialization. */
2264 init_expr_target ();
2266 /* Although the actions of these functions are language-independent,
2267 they use optabs, so we cannot call them from backend_init. */
2271 expand_dummy_function_end ();
2274 /* Language-dependent initialization. Returns nonzero on success. */
2276 lang_dependent_init (const char *name)
2278 location_t save_loc = input_location;
2279 if (dump_base_name == 0)
2280 dump_base_name = name && name[0] ? name : "gccdump";
2282 /* Other front-end initialization. */
2283 input_location = BUILTINS_LOCATION;
2284 if (lang_hooks.init () == 0)
2286 input_location = save_loc;
2288 init_asm_output (name);
2290 /* This creates various _DECL nodes, so needs to be called after the
2291 front end is initialized. */
2294 /* Do the target-specific parts of the initialization. */
2295 lang_dependent_init_target ();
2297 /* If dbx symbol table desired, initialize writing it and output the
2298 predefined types. */
2299 timevar_push (TV_SYMOUT);
2301 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
2302 if (dwarf2out_do_frame ())
2303 dwarf2out_frame_init ();
2306 /* Now we have the correct original filename, we can initialize
2308 (*debug_hooks->init) (name);
2310 timevar_pop (TV_SYMOUT);
2316 /* Reinitialize everything when target parameters, such as register usage,
2319 target_reinit (void)
2321 /* Reinitialize RTL backend. */
2322 backend_init_target ();
2324 /* Reinitialize lang-dependent parts. */
2325 lang_dependent_init_target ();
2329 dump_memory_report (bool final)
2331 ggc_print_statistics ();
2332 stringpool_statistics ();
2333 dump_tree_statistics ();
2334 dump_gimple_statistics ();
2335 dump_rtx_statistics ();
2336 dump_alloc_pool_statistics ();
2337 dump_bitmap_statistics ();
2338 dump_vec_loc_statistics ();
2339 dump_ggc_loc_statistics (final);
2340 dump_alias_stats (stderr);
2341 dump_pta_stats (stderr);
2344 /* Clean up: close opened files, etc. */
2349 /* Close the dump files. */
2350 if (flag_gen_aux_info)
2352 fclose (aux_info_file);
2354 unlink (aux_info_file_name);
2357 /* Close non-debugging input and output files. Take special care to note
2358 whether fclose returns an error, since the pages might still be on the
2359 buffer chain while the file is open. */
2363 if (ferror (asm_out_file) != 0)
2364 fatal_error ("error writing to %s: %m", asm_file_name);
2365 if (fclose (asm_out_file) != 0)
2366 fatal_error ("error closing %s: %m", asm_file_name);
2368 unlink_if_ordinary (asm_file_name);
2372 finish_optimization_passes ();
2377 dump_memory_report (true);
2379 /* Language-specific end of compilation actions. */
2380 lang_hooks.finish ();
2383 /* Initialize the compiler, and compile the input file. */
2387 /* Initialize timing first. The C front ends read the main file in
2388 the post_options hook, and C++ does file timings. */
2389 if (time_report || !quiet_flag || flag_detailed_statistics)
2391 timevar_start (TV_TOTAL);
2395 /* Don't do any more if an error has already occurred. */
2398 /* This must be run always, because it is needed to compute the FP
2399 predefined macros, such as __LDBL_MAX__, for targets using non
2400 default FP formats. */
2401 init_adjust_machine_modes ();
2403 /* Set up the back-end if requested. */
2407 /* Language-dependent initialization. Returns true on success. */
2408 if (lang_dependent_init (main_input_filename))
2414 /* Stop timing and print the times. */
2415 timevar_stop (TV_TOTAL);
2416 timevar_print (stderr);
2419 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2420 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2421 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2423 It is not safe to call this function more than once. */
2426 toplev_main (int argc, char **argv)
2428 expandargv (&argc, &argv);
2430 save_argv = CONST_CAST2 (const char **, char **, 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));
2441 initialize_plugins ();
2444 print_version (stderr, "");
2447 print_plugins_help (stderr, "");
2449 /* Exit early if we can (e.g. -help). */
2450 if (!exit_after_options)
2453 if (warningcount || errorcount)
2454 print_ignored_options ();
2455 diagnostic_finish (global_dc);
2457 /* Invoke registered plugin callbacks if any. */
2458 invoke_plugin_callbacks (PLUGIN_FINISH, NULL);
2460 finalize_plugins ();
2461 if (errorcount || sorrycount)
2462 return (FATAL_EXIT_CODE);
2464 return (SUCCESS_EXIT_CODE);