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. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
31 #include "coretypes.h"
35 #ifdef HAVE_SYS_RESOURCE_H
36 # include <sys/resource.h>
39 #ifdef HAVE_SYS_TIMES_H
40 # include <sys/times.h>
50 #include "insn-attr.h"
51 #include "insn-config.h"
52 #include "insn-flags.h"
53 #include "hard-reg-set.h"
60 #include "basic-block.h"
66 #include "diagnostic.h"
70 #include "dwarf2asm.h"
71 #include "integrate.h"
75 #include "langhooks.h"
76 #include "cfglayout.h"
78 #include "hosthooks.h"
82 #include "value-prof.h"
83 #include "alloc-pool.h"
84 #include "tree-mudflap.h"
85 #include "tree-pass.h"
87 #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 and default_debug_hooks in process_options (). */
144 #define AUTODETECT_VALUE 2
146 /* Current position in real source file. */
148 location_t input_location;
150 struct line_maps *line_table;
152 /* Name to use as base of names for dump output files. */
154 const char *dump_base_name;
156 /* Directory used for dump output files. */
158 const char *dump_dir_name;
160 /* Name to use as a base for auxiliary output files. */
162 const char *aux_base_name;
164 /* Prefix for profile data files */
165 const char *profile_data_prefix;
167 /* A mask of target_flags that includes bit X if X was set or cleared
168 on the command line. */
170 int target_flags_explicit;
172 /* Debug hooks - dependent upon command line options. */
174 const struct gcc_debug_hooks *debug_hooks;
176 /* Debug hooks - target default. */
178 static const struct gcc_debug_hooks *default_debug_hooks;
180 /* Other flags saying which kinds of debugging dump have been requested. */
182 int rtl_dump_and_exit;
183 int flag_print_asm_name;
184 enum graph_dump_types graph_dump_format;
186 /* Name for output file of assembly code, specified with -o. */
188 const char *asm_file_name;
190 /* Nonzero means do optimizations. -O.
191 Particular numeric values stand for particular amounts of optimization;
192 thus, -O2 stores 2 here. However, the optimizations beyond the basic
193 ones are not controlled directly by this variable. Instead, they are
194 controlled by individual `flag_...' variables that are defaulted
195 based on this variable. */
199 /* Nonzero means optimize for size. -Os.
200 The only valid values are zero and nonzero. When optimize_size is
201 nonzero, optimize defaults to 2, but certain individual code
202 bloating optimizations are disabled. */
204 int optimize_size = 0;
206 /* True if this is the lto front end. This is used to disable
207 gimple generation and lowering passes that are normally run on the
208 output of a front end. These passes must be bypassed for lto since
209 they have already been done before the gimple was written. */
211 bool in_lto_p = false;
213 /* Nonzero if we should write GIMPLE bytecode for link-time optimization. */
215 int flag_generate_lto;
217 /* The FUNCTION_DECL for the function currently being compiled,
218 or 0 if between functions. */
219 tree current_function_decl;
221 /* Set to the FUNC_BEGIN label of the current function, or NULL
223 const char * current_function_func_begin_label;
225 /* Nonzero means to collect statistics which might be expensive
226 and to print them when we are done. */
227 int flag_detailed_statistics = 0;
229 /* A random sequence of characters, unless overridden by user. */
230 static const char *flag_random_seed;
232 /* A local time stamp derived from the time of compilation. It will be
233 zero if the system cannot provide a time. It will be -1u, if the
234 user has specified a particular random seed. */
239 /* Nonzero means `char' should be signed. */
241 int flag_signed_char;
243 /* Nonzero means give an enum type only as many bytes as it needs. A value
244 of 2 means it has not yet been initialized. */
246 int flag_short_enums;
248 /* Nonzero if structures and unions should be returned in memory.
250 This should only be defined if compatibility with another compiler or
251 with an ABI is needed, because it results in slower code. */
253 #ifndef DEFAULT_PCC_STRUCT_RETURN
254 #define DEFAULT_PCC_STRUCT_RETURN 1
257 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
259 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
261 /* 0 means straightforward implementation of complex divide acceptable.
262 1 means wide ranges of inputs must work for complex divide.
263 2 means C99-like requirements for complex multiply and divide. */
265 int flag_complex_method = 1;
267 /* Nonzero means we should be saving declaration info into a .X file. */
269 int flag_gen_aux_info = 0;
271 /* Specified name of aux-info file. */
273 const char *aux_info_file_name;
275 /* Nonzero if we are compiling code for a shared library, zero for
280 /* Generate code for GNU or NeXT Objective-C runtime environment. */
282 #ifdef NEXT_OBJC_RUNTIME
283 int flag_next_runtime = 1;
285 int flag_next_runtime = 0;
288 /* Set to the default thread-local storage (tls) model to use. */
290 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
292 /* Set the default region and algorithm for the integrated register
295 enum ira_algorithm flag_ira_algorithm = IRA_ALGORITHM_CB;
296 enum ira_region flag_ira_region = IRA_REGION_MIXED;
298 /* Set the default value for -fira-verbose. */
300 unsigned int flag_ira_verbose = 5;
302 /* Set the default for excess precision. */
304 enum excess_precision flag_excess_precision_cmdline = EXCESS_PRECISION_DEFAULT;
305 enum excess_precision flag_excess_precision = EXCESS_PRECISION_DEFAULT;
307 /* Nonzero means change certain warnings into errors.
308 Usually these are warnings about failure to conform to some standard. */
310 int flag_pedantic_errors = 0;
312 /* Nonzero means make permerror produce warnings instead of errors. */
314 int flag_permissive = 0;
316 /* -dA causes debug commentary information to be produced in
317 the generated assembly code (to make it more readable). This option
318 is generally only of use to those who actually need to read the
319 generated assembly code (perhaps while debugging the compiler itself).
320 Currently, this switch is only used by dwarfout.c; however, it is intended
321 to be a catchall for printing debug information in the assembler file. */
323 int flag_debug_asm = 0;
325 /* -dP causes the rtl to be emitted as a comment in assembly. */
327 int flag_dump_rtl_in_asm = 0;
329 /* When non-NULL, indicates that whenever space is allocated on the
330 stack, the resulting stack pointer must not pass this
331 address---that is, for stacks that grow downward, the stack pointer
332 must always be greater than or equal to this address; for stacks
333 that grow upward, the stack pointer must be less than this address.
334 At present, the rtx may be either a REG or a SYMBOL_REF, although
335 the support provided depends on the backend. */
338 /* Positive if we should track variables, negative if we should run
339 the var-tracking pass only to discard debug annotations, zero if
340 we're not to run it. When flag_var_tracking == AUTODETECT_VALUE it
341 will be set according to optimize, debug_info_level and debug_hooks
342 in process_options (). */
343 int flag_var_tracking = AUTODETECT_VALUE;
345 /* Positive if we should track variables at assignments, negative if
346 we should run the var-tracking pass only to discard debug
347 annotations. When flag_var_tracking_assignments ==
348 AUTODETECT_VALUE it will be set according to flag_var_tracking. */
349 int flag_var_tracking_assignments = AUTODETECT_VALUE;
351 /* Nonzero if we should toggle flag_var_tracking_assignments after
352 processing options and computing its default. */
353 int flag_var_tracking_assignments_toggle = 0;
355 /* Type of stack check. */
356 enum stack_check_type flag_stack_check = NO_STACK_CHECK;
358 /* True if the user has tagged the function with the 'section'
361 bool user_defined_section_attribute = false;
363 /* Values of the -falign-* flags: how much to align labels in code.
364 0 means `use default', 1 means `don't align'.
365 For each variable, there is an _log variant which is the power
366 of two not less than the variable, for .align output. */
369 int align_loops_max_skip;
371 int align_jumps_max_skip;
372 int align_labels_log;
373 int align_labels_max_skip;
374 int align_functions_log;
378 const char *const string;
382 lang_independent_options;
384 /* Nonzero if subexpressions must be evaluated from left-to-right. */
385 int flag_evaluation_order = 0;
387 /* The user symbol prefix after having resolved same. */
388 const char *user_label_prefix;
390 static const param_info lang_independent_params[] = {
391 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
392 { OPTION, DEFAULT, false, MIN, MAX, HELP },
393 #include "params.def"
395 { NULL, 0, false, 0, 0, NULL }
398 /* Output files for assembler code (real compiler output)
399 and debugging dumps. */
403 FILE *dump_file = NULL;
404 const char *dump_file_name;
406 /* The current working directory of a translation. It's generally the
407 directory from which compilation was initiated, but a preprocessed
408 file may specify the original directory in which it was
411 static const char *src_pwd;
413 /* Initialize src_pwd with the given string, and return true. If it
414 was already initialized, return false. As a special case, it may
415 be called with a NULL argument to test whether src_pwd has NOT been
419 set_src_pwd (const char *pwd)
423 if (strcmp (src_pwd, pwd) == 0)
429 src_pwd = xstrdup (pwd);
433 /* Return the directory from which the translation unit was initiated,
434 in case set_src_pwd() was not called before to assign it a
450 /* Called when the start of a function definition is parsed,
451 this function prints on stderr the name of the function. */
453 announce_function (tree decl)
457 if (rtl_dump_and_exit)
458 fprintf (stderr, "%s ",
459 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl))));
461 fprintf (stderr, " %s",
462 identifier_to_locale (lang_hooks.decl_printable_name (decl, 2)));
464 pp_needs_newline (global_dc->printer) = true;
465 diagnostic_set_last_function (global_dc, (diagnostic_info *) NULL);
469 /* Initialize local_tick with the time of day, or -1 if
470 flag_random_seed is set. */
473 init_local_tick (void)
475 if (!flag_random_seed)
477 /* Get some more or less random data. */
478 #ifdef HAVE_GETTIMEOFDAY
482 gettimeofday (&tv, NULL);
483 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
487 time_t now = time (NULL);
489 if (now != (time_t)-1)
490 local_tick = (unsigned) now;
498 /* Set up a default flag_random_seed and local_tick, unless the user
499 already specified one. Must be called after init_local_tick. */
502 init_random_seed (void)
504 unsigned HOST_WIDE_INT value;
505 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
507 value = local_tick ^ getpid ();
509 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
510 flag_random_seed = random_seed;
513 /* Obtain the random_seed string. Unless NOINIT, initialize it if
514 it's not provided in the command line. */
517 get_random_seed (bool noinit)
519 if (!flag_random_seed && !noinit)
521 return flag_random_seed;
524 /* Modify the random_seed string to VAL. Return its previous
528 set_random_seed (const char *val)
530 const char *old = flag_random_seed;
531 flag_random_seed = val;
535 /* Decode the string P as an integral parameter.
536 If the string is indeed an integer return its numeric value else
537 issue an Invalid Option error for the option PNAME and return DEFVAL.
538 If PNAME is zero just return DEFVAL, do not call error. */
541 read_integral_parameter (const char *p, const char *pname, const int defval)
543 const char *endp = p;
556 error ("invalid option argument %qs", pname);
563 #if GCC_VERSION < 3004
565 /* The functions floor_log2 and exact_log2 are defined as inline
566 functions in toplev.h if GCC_VERSION >= 3004. The definitions here
567 are used for older versions of gcc. */
569 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
570 If X is 0, return -1. */
573 floor_log2 (unsigned HOST_WIDE_INT x)
580 if (HOST_BITS_PER_WIDE_INT > 64)
581 if (x >= (unsigned HOST_WIDE_INT) 1 << (t + 64))
583 if (HOST_BITS_PER_WIDE_INT > 32)
584 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 32))
586 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 16))
588 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 8))
590 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 4))
592 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 2))
594 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 1))
600 /* Return the logarithm of X, base 2, considering X unsigned,
601 if X is a power of 2. Otherwise, returns -1. */
604 exact_log2 (unsigned HOST_WIDE_INT x)
608 return floor_log2 (x);
611 #endif /* GCC_VERSION < 3004 */
613 /* Handler for fatal signals, such as SIGSEGV. These are transformed
614 into ICE messages, which is much more user friendly. In case the
615 error printer crashes, reset the signal to prevent infinite recursion. */
618 crash_signal (int signo)
620 signal (signo, SIG_DFL);
622 /* If we crashed while processing an ASM statement, then be a little more
623 graceful. It's most likely the user's fault. */
624 if (this_is_asm_operands)
626 output_operand_lossage ("unrecoverable error");
627 exit (FATAL_EXIT_CODE);
630 internal_error ("%s", strsignal (signo));
633 /* Arrange to dump core on error. (The regular error message is still
634 printed first, except in the case of abort().) */
637 setup_core_dumping (void)
640 signal (SIGABRT, SIG_DFL);
642 #if defined(HAVE_SETRLIMIT)
645 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
646 fatal_error ("getting core file size maximum limit: %m");
647 rlim.rlim_cur = rlim.rlim_max;
648 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
649 fatal_error ("setting core file size limit to maximum: %m");
652 diagnostic_abort_on_error (global_dc);
656 /* Strip off a legitimate source ending from the input string NAME of
657 length LEN. Rather than having to know the names used by all of
658 our front ends, we strip off an ending of a period followed by
659 up to five characters. (Java uses ".class".) */
662 strip_off_ending (char *name, int len)
665 for (i = 2; i < 6 && len > i; i++)
667 if (name[len - i] == '.')
669 name[len - i] = '\0';
675 /* Output a quoted string. */
678 output_quoted_string (FILE *asm_file, const char *string)
680 #ifdef OUTPUT_QUOTED_STRING
681 OUTPUT_QUOTED_STRING (asm_file, string);
685 putc ('\"', asm_file);
686 while ((c = *string++) != 0)
690 if (c == '\"' || c == '\\')
691 putc ('\\', asm_file);
695 fprintf (asm_file, "\\%03o", (unsigned char) c);
697 putc ('\"', asm_file);
701 /* Output a file name in the form wanted by System V. */
704 output_file_directive (FILE *asm_file, const char *input_name)
709 if (input_name == NULL)
710 input_name = "<stdin>";
712 input_name = remap_debug_filename (input_name);
714 len = strlen (input_name);
715 na = input_name + len;
717 /* NA gets INPUT_NAME sans directory names. */
718 while (na > input_name)
720 if (IS_DIR_SEPARATOR (na[-1]))
725 #ifdef ASM_OUTPUT_SOURCE_FILENAME
726 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
728 fprintf (asm_file, "\t.file\t");
729 output_quoted_string (asm_file, na);
730 putc ('\n', asm_file);
734 /* A subroutine of wrapup_global_declarations. We've come to the end of
735 the compilation unit. All deferred variables should be undeferred,
736 and all incomplete decls should be finalized. */
739 wrapup_global_declaration_1 (tree decl)
741 /* We're not deferring this any longer. Assignment is conditional to
742 avoid needlessly dirtying PCH pages. */
743 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl), TS_DECL_WITH_VIS)
744 && DECL_DEFER_OUTPUT (decl) != 0)
745 DECL_DEFER_OUTPUT (decl) = 0;
747 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
748 lang_hooks.finish_incomplete_decl (decl);
751 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
752 needs to be output. Return true if it is output. */
755 wrapup_global_declaration_2 (tree decl)
757 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
760 /* Don't write out static consts, unless we still need them.
762 We also keep static consts if not optimizing (for debugging),
763 unless the user specified -fno-keep-static-consts.
764 ??? They might be better written into the debug information.
765 This is possible when using DWARF.
767 A language processor that wants static constants to be always
768 written out (even if it is not used) is responsible for
769 calling rest_of_decl_compilation itself. E.g. the C front-end
770 calls rest_of_decl_compilation from finish_decl.
771 One motivation for this is that is conventional in some
772 environments to write things like:
773 static const char rcsid[] = "... version string ...";
774 intending to force the string to be in the executable.
776 A language processor that would prefer to have unneeded
777 static constants "optimized away" would just defer writing
778 them out until here. E.g. C++ does this, because static
779 constants are often defined in header files.
781 ??? A tempting alternative (for both C and C++) would be
782 to force a constant to be written if and only if it is
783 defined in a main file, as opposed to an include file. */
785 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
787 struct varpool_node *node;
789 node = varpool_node (decl);
793 else if (node->alias)
795 else if (!cgraph_global_info_ready
797 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
799 else if (node->needed)
801 else if (DECL_COMDAT (decl))
803 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
804 && (optimize || !flag_keep_static_consts
805 || DECL_ARTIFICIAL (decl)))
810 rest_of_decl_compilation (decl, 1, 1);
818 /* Do any final processing required for the declarations in VEC, of
819 which there are LEN. We write out inline functions and variables
820 that have been deferred until this point, but which are required.
821 Returns nonzero if anything was put out. */
824 wrapup_global_declarations (tree *vec, int len)
826 bool reconsider, output_something = false;
829 for (i = 0; i < len; i++)
830 wrapup_global_declaration_1 (vec[i]);
832 /* Now emit any global variables or functions that we have been
833 putting off. We need to loop in case one of the things emitted
834 here references another one which comes earlier in the list. */
838 for (i = 0; i < len; i++)
839 reconsider |= wrapup_global_declaration_2 (vec[i]);
841 output_something = true;
845 return output_something;
848 /* A subroutine of check_global_declarations. Issue appropriate warnings
849 for the global declaration DECL. */
852 check_global_declaration_1 (tree decl)
854 /* Warn about any function declared static but not defined. We don't
855 warn about variables, because many programs have static variables
856 that exist only to get some text into the object file. */
857 if (TREE_CODE (decl) == FUNCTION_DECL
858 && DECL_INITIAL (decl) == 0
859 && DECL_EXTERNAL (decl)
860 && ! DECL_ARTIFICIAL (decl)
861 && ! TREE_NO_WARNING (decl)
862 && ! TREE_PUBLIC (decl)
863 && (warn_unused_function
864 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
866 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
867 pedwarn (input_location, 0, "%q+F used but never defined", decl);
869 warning (OPT_Wunused_function, "%q+F declared %<static%> but never defined", decl);
870 /* This symbol is effectively an "extern" declaration now. */
871 TREE_PUBLIC (decl) = 1;
872 assemble_external (decl);
875 /* Warn about static fns or vars defined but not used. */
876 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
877 /* We don't warn about "static const" variables because the
878 "rcs_id" idiom uses that construction. */
879 || (warn_unused_variable
880 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
881 && ! DECL_IN_SYSTEM_HEADER (decl)
882 && ! TREE_USED (decl)
883 /* The TREE_USED bit for file-scope decls is kept in the identifier,
884 to handle multiple external decls in different scopes. */
885 && ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl)))
886 && ! DECL_EXTERNAL (decl)
887 && ! TREE_PUBLIC (decl)
888 /* A volatile variable might be used in some non-obvious way. */
889 && ! TREE_THIS_VOLATILE (decl)
890 /* Global register variables must be declared to reserve them. */
891 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
892 /* Otherwise, ask the language. */
893 && lang_hooks.decls.warn_unused_global (decl))
894 warning ((TREE_CODE (decl) == FUNCTION_DECL)
895 ? OPT_Wunused_function
896 : OPT_Wunused_variable,
897 "%q+D defined but not used", decl);
900 /* Issue appropriate warnings for the global declarations in VEC (of
901 which there are LEN). */
904 check_global_declarations (tree *vec, int len)
908 for (i = 0; i < len; i++)
909 check_global_declaration_1 (vec[i]);
912 /* Emit debugging information for all global declarations in VEC. */
915 emit_debug_global_declarations (tree *vec, int len)
919 /* Avoid confusing the debug information machinery when there are errors. */
920 if (errorcount != 0 || sorrycount != 0)
923 timevar_push (TV_SYMOUT);
924 for (i = 0; i < len; i++)
925 debug_hooks->global_decl (vec[i]);
926 timevar_pop (TV_SYMOUT);
929 /* Warn about a use of an identifier which was marked deprecated. */
931 warn_deprecated_use (tree node, tree attr)
935 if (node == 0 || !warn_deprecated_decl)
941 attr = DECL_ATTRIBUTES (node);
942 else if (TYPE_P (node))
944 tree decl = TYPE_STUB_DECL (node);
946 attr = lookup_attribute ("deprecated",
947 TYPE_ATTRIBUTES (TREE_TYPE (decl)));
952 attr = lookup_attribute ("deprecated", attr);
955 msg = TREE_STRING_POINTER (TREE_VALUE (TREE_VALUE (attr)));
961 expanded_location xloc = expand_location (DECL_SOURCE_LOCATION (node));
963 warning (OPT_Wdeprecated_declarations,
964 "%qD is deprecated (declared at %s:%d): %s",
965 node, xloc.file, xloc.line, msg);
967 warning (OPT_Wdeprecated_declarations,
968 "%qD is deprecated (declared at %s:%d)",
969 node, xloc.file, xloc.line);
971 else if (TYPE_P (node))
973 tree what = NULL_TREE;
974 tree decl = TYPE_STUB_DECL (node);
976 if (TYPE_NAME (node))
978 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
979 what = TYPE_NAME (node);
980 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
981 && DECL_NAME (TYPE_NAME (node)))
982 what = DECL_NAME (TYPE_NAME (node));
987 expanded_location xloc
988 = expand_location (DECL_SOURCE_LOCATION (decl));
992 warning (OPT_Wdeprecated_declarations,
993 "%qE is deprecated (declared at %s:%d): %s",
994 what, xloc.file, xloc.line, msg);
996 warning (OPT_Wdeprecated_declarations,
997 "%qE is deprecated (declared at %s:%d)", what,
998 xloc.file, xloc.line);
1003 warning (OPT_Wdeprecated_declarations,
1004 "type is deprecated (declared at %s:%d): %s",
1005 xloc.file, xloc.line, msg);
1007 warning (OPT_Wdeprecated_declarations,
1008 "type is deprecated (declared at %s:%d)",
1009 xloc.file, xloc.line);
1017 warning (OPT_Wdeprecated_declarations, "%qE is deprecated: %s",
1020 warning (OPT_Wdeprecated_declarations, "%qE is deprecated", what);
1025 warning (OPT_Wdeprecated_declarations, "type is deprecated: %s",
1028 warning (OPT_Wdeprecated_declarations, "type is deprecated");
1034 /* Compile an entire translation unit. Write a file of assembly
1035 output and various debugging dumps. */
1040 /* Initialize yet another pass. */
1042 ggc_protect_identifiers = true;
1045 init_final (main_input_filename);
1046 coverage_init (aux_base_name);
1048 invoke_plugin_callbacks (PLUGIN_START_UNIT, NULL);
1050 timevar_push (TV_PARSE);
1052 /* Call the parser, which parses the entire file (calling
1053 rest_of_compilation for each function). */
1054 lang_hooks.parse_file (set_yydebug);
1056 /* Compilation is now finished except for writing
1057 what's left of the symbol table output. */
1058 timevar_pop (TV_PARSE);
1060 if (flag_syntax_only || flag_wpa)
1063 ggc_protect_identifiers = false;
1065 /* This must also call cgraph_finalize_compilation_unit. */
1066 lang_hooks.decls.final_write_globals ();
1068 if (errorcount || sorrycount)
1071 varpool_assemble_pending_decls ();
1072 finish_aliases_2 ();
1074 /* Likewise for mudflap static object registrations. */
1076 mudflap_finish_file ();
1078 /* Likewise for emulated thread-local storage. */
1079 if (!targetm.have_tls)
1082 output_shared_constant_pool ();
1083 output_object_blocks ();
1085 /* Write out any pending weak symbol declarations. */
1088 /* This must be at the end before unwind and debug info.
1089 Some target ports emit PIC setup thunks here. */
1090 targetm.asm_out.code_end ();
1092 /* Do dbx symbols. */
1093 timevar_push (TV_SYMOUT);
1095 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
1096 if (dwarf2out_do_frame ())
1097 dwarf2out_frame_finish ();
1100 (*debug_hooks->finish) (main_input_filename);
1101 timevar_pop (TV_SYMOUT);
1103 /* Output some stuff at end of file if nec. */
1105 dw2_output_indirect_constants ();
1107 /* Flush any pending external directives. */
1108 process_pending_assemble_externals ();
1110 /* Emit LTO marker if LTO info has been previously emitted. This is
1111 used by collect2 to determine whether an object file contains IL.
1112 We used to emit an undefined reference here, but this produces
1113 link errors if an object file with IL is stored into a shared
1114 library without invoking lto1. */
1115 if (flag_generate_lto)
1117 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1118 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
1120 (unsigned HOST_WIDE_INT) 1, 8);
1121 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1122 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_v1",
1123 (unsigned HOST_WIDE_INT) 1, 8);
1125 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_v1",
1126 (unsigned HOST_WIDE_INT) 1,
1127 (unsigned HOST_WIDE_INT) 1);
1131 /* Attach a special .ident directive to the end of the file to identify
1132 the version of GCC which compiled this code. The format of the .ident
1133 string is patterned after the ones produced by native SVR4 compilers. */
1137 const char *pkg_version = "(GNU) ";
1139 if (strcmp ("(GCC) ", pkgversion_string))
1140 pkg_version = pkgversion_string;
1141 fprintf (asm_out_file, "%s\"GCC: %s%s\"\n",
1142 IDENT_ASM_OP, pkg_version, version_string);
1146 /* Invoke registered plugin callbacks. */
1147 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT, NULL);
1149 /* This must be at the end. Some target ports emit end of file directives
1150 into the assembly file here, and hence we can not output anything to the
1151 assembly file after this point. */
1152 targetm.asm_out.file_end ();
1155 /* Parse a -d... command line switch. */
1158 decode_d_option (const char *arg)
1169 flag_print_asm_name = 1;
1172 flag_dump_rtl_in_asm = 1;
1173 flag_print_asm_name = 1;
1176 graph_dump_format = vcg;
1179 rtl_dump_and_exit = 1;
1184 case 'D': /* These are handled by the preprocessor. */
1191 setup_core_dumping();
1194 enable_rtl_dump_file ();
1198 warning (0, "unrecognized gcc debugging option: %c", c);
1203 /* Indexed by enum debug_info_type. */
1204 const char *const debug_type_names[] =
1206 "none", "stabs", "coff", "dwarf-2", "xcoff", "vms"
1209 /* Print version information to FILE.
1210 Each line begins with INDENT (for the case where FILE is the
1211 assembler output file). */
1214 print_version (FILE *file, const char *indent)
1216 static const char fmt1[] =
1218 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
1220 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
1223 static const char fmt2[] =
1224 N_("GMP version %s, MPFR version %s, MPC version %s\n");
1225 static const char fmt3[] =
1226 N_("%s%swarning: %s header version %s differs from library version %s.\n");
1227 static const char fmt4[] =
1228 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
1230 #define __VERSION__ "[?]"
1233 file == stderr ? _(fmt1) : fmt1,
1234 indent, *indent != 0 ? " " : "",
1235 lang_hooks.name, pkgversion_string, version_string, TARGET_NAME,
1236 indent, __VERSION__);
1238 /* We need to stringify the GMP macro values. Ugh, gmp_version has
1239 two string formats, "i.j.k" and "i.j" when k is zero. As of
1240 gmp-4.3.0, GMP always uses the 3 number format. */
1241 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
1242 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3(X)
1243 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
1244 #define GCC_GMP_VERSION \
1245 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
1246 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
1247 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
1248 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR)
1250 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
1251 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) "." \
1252 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_PATCHLEVEL)
1255 file == stderr ? _(fmt2) : fmt2,
1256 GCC_GMP_STRINGIFY_VERSION, MPFR_VERSION_STRING, MPC_VERSION_STRING);
1257 if (strcmp (GCC_GMP_STRINGIFY_VERSION, gmp_version))
1259 file == stderr ? _(fmt3) : fmt3,
1260 indent, *indent != 0 ? " " : "",
1261 "GMP", GCC_GMP_STRINGIFY_VERSION, gmp_version);
1262 if (strcmp (MPFR_VERSION_STRING, mpfr_get_version ()))
1264 file == stderr ? _(fmt3) : fmt3,
1265 indent, *indent != 0 ? " " : "",
1266 "MPFR", MPFR_VERSION_STRING, mpfr_get_version ());
1267 if (strcmp (MPC_VERSION_STRING, mpc_get_version ()))
1269 file == stderr ? _(fmt3) : fmt3,
1270 indent, *indent != 0 ? " " : "",
1271 "MPC", MPC_VERSION_STRING, mpc_get_version ());
1273 file == stderr ? _(fmt4) : fmt4,
1274 indent, *indent != 0 ? " " : "",
1275 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
1277 print_plugins_versions (file, indent);
1280 #ifdef ASM_COMMENT_START
1282 print_to_asm_out_file (print_switch_type type, const char * text)
1284 bool prepend_sep = true;
1288 case SWITCH_TYPE_LINE_END:
1289 putc ('\n', asm_out_file);
1292 case SWITCH_TYPE_LINE_START:
1293 fputs (ASM_COMMENT_START, asm_out_file);
1294 return strlen (ASM_COMMENT_START);
1296 case SWITCH_TYPE_DESCRIPTIVE:
1297 if (ASM_COMMENT_START[0] == 0)
1298 prepend_sep = false;
1300 case SWITCH_TYPE_PASSED:
1301 case SWITCH_TYPE_ENABLED:
1303 fputc (' ', asm_out_file);
1304 fputs (text, asm_out_file);
1305 /* No need to return the length here as
1306 print_single_switch has already done it. */
1316 print_to_stderr (print_switch_type type, const char * text)
1320 case SWITCH_TYPE_LINE_END:
1321 putc ('\n', stderr);
1324 case SWITCH_TYPE_LINE_START:
1327 case SWITCH_TYPE_PASSED:
1328 case SWITCH_TYPE_ENABLED:
1329 fputc (' ', stderr);
1332 case SWITCH_TYPE_DESCRIPTIVE:
1333 fputs (text, stderr);
1334 /* No need to return the length here as
1335 print_single_switch has already done it. */
1343 /* Print an option value and return the adjusted position in the line.
1344 ??? print_fn doesn't handle errors, eg disk full; presumably other
1345 code will catch a disk full though. */
1348 print_single_switch (print_switch_fn_type print_fn,
1350 print_switch_type type,
1353 /* The ultrix fprintf returns 0 on success, so compute the result
1354 we want here since we need it for the following test. The +1
1355 is for the separator character that will probably be emitted. */
1356 int len = strlen (text) + 1;
1359 && pos + len > MAX_LINE)
1361 print_fn (SWITCH_TYPE_LINE_END, NULL);
1366 pos += print_fn (SWITCH_TYPE_LINE_START, NULL);
1368 print_fn (type, text);
1372 /* Print active target switches using PRINT_FN.
1373 POS is the current cursor position and MAX is the size of a "line".
1374 Each line begins with INDENT and ends with TERM.
1375 Each switch is separated from the next by SEP. */
1378 print_switch_values (print_switch_fn_type print_fn)
1384 /* Fill in the -frandom-seed option, if the user didn't pass it, so
1385 that it can be printed below. This helps reproducibility. */
1386 if (!flag_random_seed)
1387 init_random_seed ();
1389 /* Print the options as passed. */
1390 pos = print_single_switch (print_fn, pos,
1391 SWITCH_TYPE_DESCRIPTIVE, _("options passed: "));
1393 for (p = &save_argv[1]; *p != NULL; p++)
1398 if (strcmp (*p, "-o") == 0
1399 || strcmp (*p, "-dumpbase") == 0
1400 || strcmp (*p, "-dumpdir") == 0
1401 || strcmp (*p, "-auxbase") == 0)
1408 if (strcmp (*p, "-quiet") == 0
1409 || strcmp (*p, "-version") == 0)
1416 pos = print_single_switch (print_fn, pos, SWITCH_TYPE_PASSED, *p);
1420 print_fn (SWITCH_TYPE_LINE_END, NULL);
1422 /* Print the -f and -m options that have been enabled.
1423 We don't handle language specific options but printing argv
1425 pos = print_single_switch (print_fn, 0,
1426 SWITCH_TYPE_DESCRIPTIVE, _("options enabled: "));
1428 for (j = 0; j < cl_options_count; j++)
1429 if ((cl_options[j].flags & CL_REPORT)
1430 && option_enabled (j) > 0)
1431 pos = print_single_switch (print_fn, pos,
1432 SWITCH_TYPE_ENABLED, cl_options[j].opt_text);
1434 print_fn (SWITCH_TYPE_LINE_END, NULL);
1437 /* Open assembly code output file. Do this even if -fsyntax-only is
1438 on, because then the driver will have provided the name of a
1439 temporary file or bit bucket for us. NAME is the file specified on
1440 the command line, possibly NULL. */
1442 init_asm_output (const char *name)
1444 if (name == NULL && asm_file_name == 0)
1445 asm_out_file = stdout;
1448 if (asm_file_name == 0)
1450 int len = strlen (dump_base_name);
1451 char *dumpname = XNEWVEC (char, len + 6);
1453 memcpy (dumpname, dump_base_name, len + 1);
1454 strip_off_ending (dumpname, len);
1455 strcat (dumpname, ".s");
1456 asm_file_name = dumpname;
1458 if (!strcmp (asm_file_name, "-"))
1459 asm_out_file = stdout;
1461 asm_out_file = fopen (asm_file_name, "w+b");
1462 if (asm_out_file == 0)
1463 fatal_error ("can%'t open %s for writing: %m", asm_file_name);
1466 if (!flag_syntax_only)
1468 targetm.asm_out.file_start ();
1470 if (flag_record_gcc_switches)
1472 if (targetm.asm_out.record_gcc_switches)
1474 /* Let the target know that we are about to start recording. */
1475 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
1477 /* Now record the switches. */
1478 print_switch_values (targetm.asm_out.record_gcc_switches);
1479 /* Let the target know that the recording is over. */
1480 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
1484 inform (input_location, "-frecord-gcc-switches is not supported by the current target");
1487 #ifdef ASM_COMMENT_START
1488 if (flag_verbose_asm)
1490 /* Print the list of switches in effect
1491 into the assembler file as comments. */
1492 print_version (asm_out_file, ASM_COMMENT_START);
1493 print_switch_values (print_to_asm_out_file);
1494 putc ('\n', asm_out_file);
1500 /* Return true if the state of option OPTION should be stored in PCH files
1501 and checked by default_pch_valid_p. Store the option's current state
1505 option_affects_pch_p (int option, struct cl_option_state *state)
1507 if ((cl_options[option].flags & CL_TARGET) == 0)
1509 if (cl_options[option].flag_var == &target_flags)
1510 if (targetm.check_pch_target_flags)
1512 return get_option_state (option, state);
1515 /* Default version of get_pch_validity.
1516 By default, every flag difference is fatal; that will be mostly right for
1517 most targets, but completely right for very few. */
1520 default_get_pch_validity (size_t *sz)
1522 struct cl_option_state state;
1527 if (targetm.check_pch_target_flags)
1528 *sz += sizeof (target_flags);
1529 for (i = 0; i < cl_options_count; i++)
1530 if (option_affects_pch_p (i, &state))
1533 result = r = XNEWVEC (char, *sz);
1537 if (targetm.check_pch_target_flags)
1539 memcpy (r, &target_flags, sizeof (target_flags));
1540 r += sizeof (target_flags);
1543 for (i = 0; i < cl_options_count; i++)
1544 if (option_affects_pch_p (i, &state))
1546 memcpy (r, state.data, state.size);
1553 /* Return a message which says that a PCH file was created with a different
1554 setting of OPTION. */
1557 pch_option_mismatch (const char *option)
1561 asprintf (&r, _("created and used with differing settings of '%s'"), option);
1563 return _("out of memory");
1567 /* Default version of pch_valid_p. */
1570 default_pch_valid_p (const void *data_p, size_t len)
1572 struct cl_option_state state;
1573 const char *data = (const char *)data_p;
1576 /* -fpic and -fpie also usually make a PCH invalid. */
1577 if (data[0] != flag_pic)
1578 return _("created and used with different settings of -fpic");
1579 if (data[1] != flag_pie)
1580 return _("created and used with different settings of -fpie");
1583 /* Check target_flags. */
1584 if (targetm.check_pch_target_flags)
1589 memcpy (&tf, data, sizeof (target_flags));
1590 data += sizeof (target_flags);
1591 len -= sizeof (target_flags);
1592 r = targetm.check_pch_target_flags (tf);
1597 for (i = 0; i < cl_options_count; i++)
1598 if (option_affects_pch_p (i, &state))
1600 if (memcmp (data, state.data, state.size) != 0)
1601 return pch_option_mismatch (cl_options[i].opt_text);
1609 /* Default tree printer. Handles declarations only. */
1611 default_tree_printer (pretty_printer *pp, text_info *text, const char *spec,
1612 int precision, bool wide, bool set_locus, bool hash)
1616 /* FUTURE: %+x should set the locus. */
1617 if (precision != 0 || wide || hash)
1623 t = va_arg (*text->args_ptr, tree);
1624 if (TREE_CODE (t) == IDENTIFIER_NODE)
1626 pp_identifier (pp, IDENTIFIER_POINTER (t));
1632 t = va_arg (*text->args_ptr, tree);
1633 if (DECL_DEBUG_EXPR_IS_FROM (t) && DECL_DEBUG_EXPR (t))
1634 t = DECL_DEBUG_EXPR (t);
1639 t = va_arg (*text->args_ptr, tree);
1646 if (set_locus && text->locus)
1647 *text->locus = DECL_SOURCE_LOCATION (t);
1651 const char *n = DECL_NAME (t)
1652 ? identifier_to_locale (lang_hooks.decl_printable_name (t, 2))
1657 dump_generic_node (pp, t, 0, TDF_DIAGNOSTIC, 0);
1662 /* A helper function; used as the reallocator function for cpp's line
1665 realloc_for_line_map (void *ptr, size_t len)
1667 return ggc_realloc (ptr, len);
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 /* Initialize the diagnostics reporting machinery, so option parsing
1693 can give warnings and errors. */
1694 diagnostic_initialize (global_dc);
1695 /* Set a default printer. Language specific initializations will
1696 override it later. */
1697 pp_format_decoder (global_dc->printer) = &default_tree_printer;
1698 global_dc->show_option_requested = flag_diagnostics_show_option;
1700 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1702 signal (SIGSEGV, crash_signal);
1705 signal (SIGILL, crash_signal);
1708 signal (SIGBUS, crash_signal);
1711 signal (SIGABRT, crash_signal);
1713 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1714 signal (SIGIOT, crash_signal);
1717 signal (SIGFPE, crash_signal);
1720 /* Other host-specific signal setup. */
1721 (*host_hooks.extra_signals)();
1723 /* Initialize the garbage-collector, string pools and tree type hash
1727 line_table = GGC_NEW (struct line_maps);
1728 linemap_init (line_table);
1729 line_table->reallocator = realloc_for_line_map;
1732 /* Initialize register usage now so switches may override. */
1735 /* Register the language-independent parameters. */
1736 add_params (lang_independent_params, LAST_PARAM);
1738 /* This must be done after add_params but before argument processing. */
1739 init_ggc_heuristics();
1740 init_optimization_passes ();
1741 statistics_early_init ();
1744 /* Return true if the current target supports -fsection-anchors. */
1747 target_supports_section_anchors_p (void)
1749 if (targetm.min_anchor_offset == 0 && targetm.max_anchor_offset == 0)
1752 if (targetm.asm_out.output_anchor == NULL)
1758 /* Default the align_* variables to 1 if they're still unset, and
1759 set up the align_*_log variables. */
1761 init_alignments (void)
1763 if (align_loops <= 0)
1765 if (align_loops_max_skip > align_loops)
1766 align_loops_max_skip = align_loops - 1;
1767 align_loops_log = floor_log2 (align_loops * 2 - 1);
1768 if (align_jumps <= 0)
1770 if (align_jumps_max_skip > align_jumps)
1771 align_jumps_max_skip = align_jumps - 1;
1772 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1773 if (align_labels <= 0)
1775 align_labels_log = floor_log2 (align_labels * 2 - 1);
1776 if (align_labels_max_skip > align_labels)
1777 align_labels_max_skip = align_labels - 1;
1778 if (align_functions <= 0)
1779 align_functions = 1;
1780 align_functions_log = floor_log2 (align_functions * 2 - 1);
1783 /* Process the options that have been parsed. */
1785 process_options (void)
1787 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1788 This can happen with incorrect pre-processed input. */
1789 debug_hooks = &do_nothing_debug_hooks;
1791 /* This replaces set_Wunused. */
1792 if (warn_unused_function == -1)
1793 warn_unused_function = warn_unused;
1794 if (warn_unused_label == -1)
1795 warn_unused_label = warn_unused;
1796 /* Wunused-parameter is enabled if both -Wunused -Wextra are enabled. */
1797 if (warn_unused_parameter == -1)
1798 warn_unused_parameter = (warn_unused && extra_warnings);
1799 if (warn_unused_variable == -1)
1800 warn_unused_variable = warn_unused;
1801 /* Wunused-but-set-parameter is enabled if both -Wunused -Wextra are
1803 if (warn_unused_but_set_parameter == -1)
1804 warn_unused_but_set_parameter = (warn_unused && extra_warnings);
1805 if (warn_unused_but_set_variable == -1)
1806 warn_unused_but_set_variable = warn_unused;
1807 if (warn_unused_value == -1)
1808 warn_unused_value = warn_unused;
1810 /* This replaces set_Wextra. */
1811 if (warn_uninitialized == -1)
1812 warn_uninitialized = extra_warnings;
1814 /* Allow the front end to perform consistency checks and do further
1815 initialization based on the command line options. This hook also
1816 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1817 so we can correctly initialize debug output. */
1818 no_backend = lang_hooks.post_options (&main_input_filename);
1820 #ifdef OVERRIDE_OPTIONS
1821 /* Some machines may reject certain combinations of options. */
1825 /* Avoid any informative notes in the second run of -fcompare-debug. */
1826 if (flag_compare_debug)
1827 diagnostic_inhibit_notes (global_dc);
1829 if (flag_section_anchors && !target_supports_section_anchors_p ())
1831 warning (OPT_fsection_anchors,
1832 "this target does not support %qs", "-fsection-anchors");
1833 flag_section_anchors = 0;
1836 if (flag_short_enums == 2)
1837 flag_short_enums = targetm.default_short_enums ();
1839 /* Set aux_base_name if not already set. */
1842 else if (main_input_filename)
1844 char *name = xstrdup (lbasename (main_input_filename));
1846 strip_off_ending (name, strlen (name));
1847 aux_base_name = name;
1850 aux_base_name = "gccaux";
1855 || flag_loop_interchange
1856 || flag_loop_strip_mine
1857 || flag_graphite_identity
1858 || flag_loop_parallelize_all)
1859 sorry ("Graphite loop optimizations cannot be used");
1862 /* Unrolling all loops implies that standard loop unrolling must also
1864 if (flag_unroll_all_loops)
1865 flag_unroll_loops = 1;
1867 /* The loop unrolling code assumes that cse will be run after loop.
1868 web and rename-registers also help when run after loop unrolling. */
1869 if (flag_rerun_cse_after_loop == AUTODETECT_VALUE)
1870 flag_rerun_cse_after_loop = flag_unroll_loops || flag_peel_loops;
1872 if (flag_web == AUTODETECT_VALUE)
1873 flag_web = flag_unroll_loops || flag_peel_loops;
1875 if (flag_rename_registers == AUTODETECT_VALUE)
1876 flag_rename_registers = flag_unroll_loops || flag_peel_loops;
1878 if (flag_non_call_exceptions)
1879 flag_asynchronous_unwind_tables = 1;
1880 if (flag_asynchronous_unwind_tables)
1881 flag_unwind_tables = 1;
1883 if (flag_value_profile_transformations)
1884 flag_profile_values = 1;
1886 /* Warn about options that are not supported on this machine. */
1887 #ifndef INSN_SCHEDULING
1888 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1889 warning (0, "instruction scheduling not supported on this target machine");
1892 if (flag_delayed_branch)
1893 warning (0, "this target machine does not have delayed branches");
1896 user_label_prefix = USER_LABEL_PREFIX;
1897 if (flag_leading_underscore != -1)
1899 /* If the default prefix is more complicated than "" or "_",
1900 issue a warning and ignore this option. */
1901 if (user_label_prefix[0] == 0 ||
1902 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1904 user_label_prefix = flag_leading_underscore ? "_" : "";
1907 warning (0, "-f%sleading-underscore not supported on this target machine",
1908 flag_leading_underscore ? "" : "no-");
1911 /* If we are in verbose mode, write out the version and maybe all the
1912 option flags in use. */
1915 print_version (stderr, "");
1917 print_switch_values (print_to_stderr);
1920 if (flag_syntax_only)
1922 write_symbols = NO_DEBUG;
1928 if (debug_info_level == DINFO_LEVEL_NONE)
1930 debug_info_level = DINFO_LEVEL_NORMAL;
1932 if (write_symbols == NO_DEBUG)
1933 write_symbols = PREFERRED_DEBUGGING_TYPE;
1936 debug_info_level = DINFO_LEVEL_NONE;
1939 if (flag_dump_final_insns && !flag_syntax_only && !no_backend)
1941 FILE *final_output = fopen (flag_dump_final_insns, "w");
1944 error ("could not open final insn dump file %qs: %s",
1945 flag_dump_final_insns, strerror (errno));
1946 flag_dump_final_insns = NULL;
1948 else if (fclose (final_output))
1950 error ("could not close zeroed insn dump file %qs: %s",
1951 flag_dump_final_insns, strerror (errno));
1952 flag_dump_final_insns = NULL;
1956 /* Unless over-ridden for the target, assume that all DWARF levels
1957 may be emitted, if DWARF2_DEBUG is selected. */
1958 if (dwarf_strict < 0)
1961 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1963 if (debug_info_level == DINFO_LEVEL_NONE)
1964 write_symbols = NO_DEBUG;
1966 /* Now we know write_symbols, set up the debug hooks based on it.
1967 By default we do nothing for debug output. */
1968 if (PREFERRED_DEBUGGING_TYPE == NO_DEBUG)
1969 default_debug_hooks = &do_nothing_debug_hooks;
1970 #if defined(DBX_DEBUGGING_INFO)
1971 else if (PREFERRED_DEBUGGING_TYPE == DBX_DEBUG)
1972 default_debug_hooks = &dbx_debug_hooks;
1974 #if defined(XCOFF_DEBUGGING_INFO)
1975 else if (PREFERRED_DEBUGGING_TYPE == XCOFF_DEBUG)
1976 default_debug_hooks = &xcoff_debug_hooks;
1978 #ifdef SDB_DEBUGGING_INFO
1979 else if (PREFERRED_DEBUGGING_TYPE == SDB_DEBUG)
1980 default_debug_hooks = &sdb_debug_hooks;
1982 #ifdef DWARF2_DEBUGGING_INFO
1983 else if (PREFERRED_DEBUGGING_TYPE == DWARF2_DEBUG)
1984 default_debug_hooks = &dwarf2_debug_hooks;
1986 #ifdef VMS_DEBUGGING_INFO
1987 else if (PREFERRED_DEBUGGING_TYPE == VMS_DEBUG
1988 || PREFERRED_DEBUGGING_TYPE == VMS_AND_DWARF2_DEBUG)
1989 default_debug_hooks = &vmsdbg_debug_hooks;
1992 if (write_symbols == NO_DEBUG)
1994 #if defined(DBX_DEBUGGING_INFO)
1995 else if (write_symbols == DBX_DEBUG)
1996 debug_hooks = &dbx_debug_hooks;
1998 #if defined(XCOFF_DEBUGGING_INFO)
1999 else if (write_symbols == XCOFF_DEBUG)
2000 debug_hooks = &xcoff_debug_hooks;
2002 #ifdef SDB_DEBUGGING_INFO
2003 else if (write_symbols == SDB_DEBUG)
2004 debug_hooks = &sdb_debug_hooks;
2006 #ifdef DWARF2_DEBUGGING_INFO
2007 else if (write_symbols == DWARF2_DEBUG)
2008 debug_hooks = &dwarf2_debug_hooks;
2010 #ifdef VMS_DEBUGGING_INFO
2011 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
2012 debug_hooks = &vmsdbg_debug_hooks;
2015 error ("target system does not support the \"%s\" debug format",
2016 debug_type_names[write_symbols]);
2018 /* We know which debug output will be used so we can set flag_var_tracking
2019 and flag_var_tracking_uninit if the user has not specified them. */
2020 if (debug_info_level < DINFO_LEVEL_NORMAL
2021 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
2023 if (flag_var_tracking == 1
2024 || flag_var_tracking_uninit == 1)
2026 if (debug_info_level < DINFO_LEVEL_NORMAL)
2027 warning (0, "variable tracking requested, but useless unless "
2028 "producing debug info");
2030 warning (0, "variable tracking requested, but not supported "
2031 "by this debug format");
2033 flag_var_tracking = 0;
2034 flag_var_tracking_uninit = 0;
2037 /* If the user specifically requested variable tracking with tagging
2038 uninitialized variables, we need to turn on variable tracking.
2039 (We already determined above that variable tracking is feasible.) */
2040 if (flag_var_tracking_uninit)
2041 flag_var_tracking = 1;
2043 if (flag_var_tracking == AUTODETECT_VALUE)
2044 flag_var_tracking = optimize >= 1;
2046 if (flag_var_tracking_assignments == AUTODETECT_VALUE)
2047 flag_var_tracking_assignments = flag_var_tracking
2048 && !(flag_selective_scheduling || flag_selective_scheduling2);
2050 if (flag_var_tracking_assignments_toggle)
2051 flag_var_tracking_assignments = !flag_var_tracking_assignments;
2053 if (flag_var_tracking_assignments && !flag_var_tracking)
2054 flag_var_tracking = flag_var_tracking_assignments = -1;
2056 if (flag_var_tracking_assignments
2057 && (flag_selective_scheduling || flag_selective_scheduling2))
2058 warning (0, "var-tracking-assignments changes selective scheduling");
2060 if (flag_tree_cselim == AUTODETECT_VALUE)
2061 #ifdef HAVE_conditional_move
2062 flag_tree_cselim = 1;
2064 flag_tree_cselim = 0;
2067 /* If auxiliary info generation is desired, open the output file.
2068 This goes in the same directory as the source file--unlike
2069 all the other output files. */
2070 if (flag_gen_aux_info)
2072 aux_info_file = fopen (aux_info_file_name, "w");
2073 if (aux_info_file == 0)
2074 fatal_error ("can%'t open %s: %m", aux_info_file_name);
2077 if (! targetm.have_named_sections)
2079 if (flag_function_sections)
2081 warning (0, "-ffunction-sections not supported for this target");
2082 flag_function_sections = 0;
2084 if (flag_data_sections)
2086 warning (0, "-fdata-sections not supported for this target");
2087 flag_data_sections = 0;
2091 if (flag_function_sections && profile_flag)
2093 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
2094 flag_function_sections = 0;
2097 #ifndef HAVE_prefetch
2098 if (flag_prefetch_loop_arrays)
2100 warning (0, "-fprefetch-loop-arrays not supported for this target");
2101 flag_prefetch_loop_arrays = 0;
2104 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
2106 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
2107 flag_prefetch_loop_arrays = 0;
2111 /* This combination of options isn't handled for i386 targets and doesn't
2112 make much sense anyway, so don't allow it. */
2113 if (flag_prefetch_loop_arrays && optimize_size)
2115 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
2116 flag_prefetch_loop_arrays = 0;
2119 /* The presence of IEEE signaling NaNs, implies all math can trap. */
2120 if (flag_signaling_nans)
2121 flag_trapping_math = 1;
2123 /* We cannot reassociate if we want traps or signed zeros. */
2124 if (flag_associative_math && (flag_trapping_math || flag_signed_zeros))
2126 warning (0, "-fassociative-math disabled; other options take precedence");
2127 flag_associative_math = 0;
2130 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
2131 if (flag_cx_limited_range)
2132 flag_complex_method = 0;
2134 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
2135 if (flag_cx_fortran_rules)
2136 flag_complex_method = 1;
2138 /* Targets must be able to place spill slots at lower addresses. If the
2139 target already uses a soft frame pointer, the transition is trivial. */
2140 if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
2142 warning (0, "-fstack-protector not supported for this target");
2143 flag_stack_protect = 0;
2145 if (!flag_stack_protect)
2146 warn_stack_protect = 0;
2148 /* ??? Unwind info is not correct around the CFG unless either a frame
2149 pointer is present or A_O_A is set. Fixing this requires rewriting
2150 unwind info generation to be aware of the CFG and propagating states
2152 if (flag_unwind_tables && !ACCUMULATE_OUTGOING_ARGS
2153 && flag_omit_frame_pointer)
2155 warning (0, "unwind tables currently require a frame pointer "
2157 flag_omit_frame_pointer = 0;
2160 /* Save the current optimization options. */
2161 optimization_default_node = build_optimization_node ();
2162 optimization_current_node = optimization_default_node;
2165 /* This function can be called multiple times to reinitialize the compiler
2166 back end when register classes or instruction sets have changed,
2167 before each function. */
2169 backend_init_target (void)
2171 /* Initialize alignment variables. */
2174 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
2175 to initialize reg_raw_mode[]. */
2178 /* This invokes target hooks to set fixed_reg[] etc, which is
2182 /* This depends on stack_pointer_rtx. */
2183 init_fake_stack_mems ();
2185 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
2187 init_alias_target ();
2189 /* Depends on HARD_FRAME_POINTER_REGNUM. */
2192 /* The following initialization functions need to generate rtl, so
2193 provide a dummy function context for them. */
2194 init_dummy_function_start ();
2196 /* rtx_cost is mode-dependent, so cached values need to be recomputed
2197 on a mode change. */
2200 /* We may need to recompute regno_save_code[] and regno_restore_code[]
2201 after a mode change as well. */
2202 caller_save_initialized_p = false;
2204 expand_dummy_function_end ();
2207 /* Initialize the compiler back end. This function is called only once,
2208 when starting the compiler. */
2215 init_inline_once ();
2216 init_varasm_once ();
2217 save_register_info ();
2219 /* Initialize the target-specific back end pieces. */
2221 backend_init_target ();
2224 /* Initialize excess precision settings. */
2226 init_excess_precision (void)
2228 /* Adjust excess precision handling based on the target options. If
2229 the front end cannot handle it, flag_excess_precision_cmdline
2230 will already have been set accordingly in the post_options
2232 gcc_assert (flag_excess_precision_cmdline != EXCESS_PRECISION_DEFAULT);
2233 flag_excess_precision = flag_excess_precision_cmdline;
2234 if (flag_unsafe_math_optimizations)
2235 flag_excess_precision = EXCESS_PRECISION_FAST;
2236 if (flag_excess_precision == EXCESS_PRECISION_STANDARD)
2238 int flt_eval_method = TARGET_FLT_EVAL_METHOD;
2239 switch (flt_eval_method)
2243 /* Either the target acts unpredictably (-1) or has all the
2244 operations required not to have excess precision (0). */
2245 flag_excess_precision = EXCESS_PRECISION_FAST;
2249 /* In these cases, predictable excess precision makes
2253 /* Any other implementation-defined FLT_EVAL_METHOD values
2254 require the compiler to handle the associated excess
2255 precision rules in excess_precision_type. */
2261 /* Initialize things that are both lang-dependent and target-dependent.
2262 This function can be called more than once if target parameters change. */
2264 lang_dependent_init_target (void)
2266 /* This determines excess precision settings. */
2267 init_excess_precision ();
2269 /* This creates various _DECL nodes, so needs to be called after the
2270 front end is initialized. It also depends on the HAVE_xxx macros
2271 generated from the target machine description. */
2274 /* The following initialization functions need to generate rtl, so
2275 provide a dummy function context for them. */
2276 init_dummy_function_start ();
2278 /* Do the target-specific parts of expr initialization. */
2279 init_expr_target ();
2281 /* Although the actions of these functions are language-independent,
2282 they use optabs, so we cannot call them from backend_init. */
2286 expand_dummy_function_end ();
2289 /* Language-dependent initialization. Returns nonzero on success. */
2291 lang_dependent_init (const char *name)
2293 location_t save_loc = input_location;
2294 if (dump_base_name == 0)
2295 dump_base_name = name && name[0] ? name : "gccdump";
2297 /* Other front-end initialization. */
2298 input_location = BUILTINS_LOCATION;
2299 if (lang_hooks.init () == 0)
2301 input_location = save_loc;
2303 init_asm_output (name);
2305 /* This creates various _DECL nodes, so needs to be called after the
2306 front end is initialized. */
2309 /* Do the target-specific parts of the initialization. */
2310 lang_dependent_init_target ();
2312 /* If dbx symbol table desired, initialize writing it and output the
2313 predefined types. */
2314 timevar_push (TV_SYMOUT);
2316 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
2317 if (dwarf2out_do_frame ())
2318 dwarf2out_frame_init ();
2321 /* Now we have the correct original filename, we can initialize
2323 (*debug_hooks->init) (name);
2325 timevar_pop (TV_SYMOUT);
2331 /* Reinitialize everything when target parameters, such as register usage,
2334 target_reinit (void)
2336 /* Reinitialize RTL backend. */
2337 backend_init_target ();
2339 /* Reinitialize lang-dependent parts. */
2340 lang_dependent_init_target ();
2344 dump_memory_report (bool final)
2346 ggc_print_statistics ();
2347 stringpool_statistics ();
2348 dump_tree_statistics ();
2349 dump_gimple_statistics ();
2350 dump_rtx_statistics ();
2351 dump_varray_statistics ();
2352 dump_alloc_pool_statistics ();
2353 dump_bitmap_statistics ();
2354 dump_vec_loc_statistics ();
2355 dump_ggc_loc_statistics (final);
2356 dump_alias_stats (stderr);
2357 dump_pta_stats (stderr);
2360 /* Clean up: close opened files, etc. */
2365 /* Close the dump files. */
2366 if (flag_gen_aux_info)
2368 fclose (aux_info_file);
2370 unlink (aux_info_file_name);
2373 /* Close non-debugging input and output files. Take special care to note
2374 whether fclose returns an error, since the pages might still be on the
2375 buffer chain while the file is open. */
2379 if (ferror (asm_out_file) != 0)
2380 fatal_error ("error writing to %s: %m", asm_file_name);
2381 if (fclose (asm_out_file) != 0)
2382 fatal_error ("error closing %s: %m", asm_file_name);
2384 unlink_if_ordinary (asm_file_name);
2388 finish_optimization_passes ();
2393 dump_memory_report (true);
2395 /* Language-specific end of compilation actions. */
2396 lang_hooks.finish ();
2399 /* Initialize the compiler, and compile the input file. */
2403 /* Initialize timing first. The C front ends read the main file in
2404 the post_options hook, and C++ does file timings. */
2405 if (time_report || !quiet_flag || flag_detailed_statistics)
2407 timevar_start (TV_TOTAL);
2411 /* Don't do any more if an error has already occurred. */
2414 /* This must be run always, because it is needed to compute the FP
2415 predefined macros, such as __LDBL_MAX__, for targets using non
2416 default FP formats. */
2417 init_adjust_machine_modes ();
2419 /* Set up the back-end if requested. */
2423 /* Language-dependent initialization. Returns true on success. */
2424 if (lang_dependent_init (main_input_filename))
2430 /* Stop timing and print the times. */
2431 timevar_stop (TV_TOTAL);
2432 timevar_print (stderr);
2435 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2436 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2437 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2439 It is not safe to call this function more than once. */
2442 toplev_main (int argc, char **argv)
2444 expandargv (&argc, &argv);
2446 save_argv = CONST_CAST2 (const char **, char **, argv);
2448 /* Initialization of GCC's environment, and diagnostics. */
2449 general_init (argv[0]);
2451 /* Parse the options and do minimal processing; basically just
2452 enough to default flags appropriately. */
2453 decode_options (argc, CONST_CAST2 (const char **, char **, argv));
2457 initialize_plugins ();
2460 print_version (stderr, "");
2463 print_plugins_help (stderr, "");
2465 /* Exit early if we can (e.g. -help). */
2466 if (!exit_after_options)
2469 if (warningcount || errorcount)
2470 print_ignored_options ();
2471 diagnostic_finish (global_dc);
2473 /* Invoke registered plugin callbacks if any. */
2474 invoke_plugin_callbacks (PLUGIN_FINISH, NULL);
2476 finalize_plugins ();
2477 if (errorcount || sorrycount)
2478 return (FATAL_EXIT_CODE);
2480 return (SUCCESS_EXIT_CODE);