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
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"
88 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
89 #include "dwarf2out.h"
92 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
96 #ifdef SDB_DEBUGGING_INFO
100 #ifdef XCOFF_DEBUGGING_INFO
101 #include "xcoffout.h" /* Needed for external data
102 declarations for e.g. AIX 4.x. */
105 static void general_init (const char *);
106 static void do_compile (void);
107 static void process_options (void);
108 static void backend_init (void);
109 static int lang_dependent_init (const char *);
110 static void init_asm_output (const char *);
111 static void finalize (void);
113 static void crash_signal (int) ATTRIBUTE_NORETURN;
114 static void setup_core_dumping (void);
115 static void compile_file (void);
117 /* Nonzero to dump debug info whilst parsing (-dy option). */
118 static int set_yydebug;
120 /* True if we don't need a backend (e.g. preprocessing only). */
121 static bool no_backend;
123 /* Length of line when printing switch values. */
126 /* Name of program invoked, sans directories. */
128 const char *progname;
130 /* Copy of argument vector to toplev_main. */
131 static const char **save_argv;
133 /* Name of top-level original source file (what was input to cpp).
134 This comes from the #-command at the beginning of the actual input.
135 If there isn't any there, then this is the cc1 input file name. */
137 const char *main_input_filename;
139 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
140 to optimize and default_debug_hooks in process_options (). */
141 #define AUTODETECT_VALUE 2
143 /* Current position in real source file. */
145 location_t input_location;
147 struct line_maps *line_table;
149 /* Name to use as base of names for dump output files. */
151 const char *dump_base_name;
153 /* Name to use as a base for auxiliary output files. */
155 const char *aux_base_name;
157 /* Prefix for profile data files */
158 const char *profile_data_prefix;
160 /* A mask of target_flags that includes bit X if X was set or cleared
161 on the command line. */
163 int target_flags_explicit;
165 /* Debug hooks - dependent upon command line options. */
167 const struct gcc_debug_hooks *debug_hooks;
169 /* Debug hooks - target default. */
171 static const struct gcc_debug_hooks *default_debug_hooks;
173 /* Other flags saying which kinds of debugging dump have been requested. */
175 int rtl_dump_and_exit;
176 int flag_print_asm_name;
177 enum graph_dump_types graph_dump_format;
179 /* Name for output file of assembly code, specified with -o. */
181 const char *asm_file_name;
183 /* Nonzero means do optimizations. -O.
184 Particular numeric values stand for particular amounts of optimization;
185 thus, -O2 stores 2 here. However, the optimizations beyond the basic
186 ones are not controlled directly by this variable. Instead, they are
187 controlled by individual `flag_...' variables that are defaulted
188 based on this variable. */
192 /* Nonzero means optimize for size. -Os.
193 The only valid values are zero and nonzero. When optimize_size is
194 nonzero, optimize defaults to 2, but certain individual code
195 bloating optimizations are disabled. */
197 int optimize_size = 0;
199 /* The FUNCTION_DECL for the function currently being compiled,
200 or 0 if between functions. */
201 tree current_function_decl;
203 /* Set to the FUNC_BEGIN label of the current function, or NULL
205 const char * current_function_func_begin_label;
207 /* Nonzero means to collect statistics which might be expensive
208 and to print them when we are done. */
209 int flag_detailed_statistics = 0;
211 /* A random sequence of characters, unless overridden by user. */
212 static const char *flag_random_seed;
214 /* A local time stamp derived from the time of compilation. It will be
215 zero if the system cannot provide a time. It will be -1u, if the
216 user has specified a particular random seed. */
221 /* Nonzero means `char' should be signed. */
223 int flag_signed_char;
225 /* Nonzero means give an enum type only as many bytes as it needs. A value
226 of 2 means it has not yet been initialized. */
228 int flag_short_enums;
230 /* Nonzero if structures and unions should be returned in memory.
232 This should only be defined if compatibility with another compiler or
233 with an ABI is needed, because it results in slower code. */
235 #ifndef DEFAULT_PCC_STRUCT_RETURN
236 #define DEFAULT_PCC_STRUCT_RETURN 1
239 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
241 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
243 /* 0 means straightforward implementation of complex divide acceptable.
244 1 means wide ranges of inputs must work for complex divide.
245 2 means C99-like requirements for complex multiply and divide. */
247 int flag_complex_method = 1;
249 /* Nonzero means we should be saving declaration info into a .X file. */
251 int flag_gen_aux_info = 0;
253 /* Specified name of aux-info file. */
255 const char *aux_info_file_name;
257 /* Nonzero if we are compiling code for a shared library, zero for
262 /* Generate code for GNU or NeXT Objective-C runtime environment. */
264 #ifdef NEXT_OBJC_RUNTIME
265 int flag_next_runtime = 1;
267 int flag_next_runtime = 0;
270 /* Set to the default thread-local storage (tls) model to use. */
272 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
274 /* Set the default region and algorithm for the integrated register
277 enum ira_algorithm flag_ira_algorithm = IRA_ALGORITHM_CB;
278 enum ira_region flag_ira_region = IRA_REGION_MIXED;
280 /* Set the default value for -fira-verbose. */
282 unsigned int flag_ira_verbose = 5;
284 /* Set the default for excess precision. */
286 enum excess_precision flag_excess_precision_cmdline = EXCESS_PRECISION_DEFAULT;
287 enum excess_precision flag_excess_precision = EXCESS_PRECISION_DEFAULT;
289 /* Nonzero means change certain warnings into errors.
290 Usually these are warnings about failure to conform to some standard. */
292 int flag_pedantic_errors = 0;
294 /* Nonzero means make permerror produce warnings instead of errors. */
296 int flag_permissive = 0;
298 /* -dA causes debug commentary information to be produced in
299 the generated assembly code (to make it more readable). This option
300 is generally only of use to those who actually need to read the
301 generated assembly code (perhaps while debugging the compiler itself).
302 Currently, this switch is only used by dwarfout.c; however, it is intended
303 to be a catchall for printing debug information in the assembler file. */
305 int flag_debug_asm = 0;
307 /* -dP causes the rtl to be emitted as a comment in assembly. */
309 int flag_dump_rtl_in_asm = 0;
311 /* When non-NULL, indicates that whenever space is allocated on the
312 stack, the resulting stack pointer must not pass this
313 address---that is, for stacks that grow downward, the stack pointer
314 must always be greater than or equal to this address; for stacks
315 that grow upward, the stack pointer must be less than this address.
316 At present, the rtx may be either a REG or a SYMBOL_REF, although
317 the support provided depends on the backend. */
320 /* Nonzero if we should track variables. When
321 flag_var_tracking == AUTODETECT_VALUE it will be set according
322 to optimize, debug_info_level and debug_hooks in process_options (). */
323 int flag_var_tracking = AUTODETECT_VALUE;
325 /* Type of stack check. */
326 enum stack_check_type flag_stack_check = NO_STACK_CHECK;
328 /* True if the user has tagged the function with the 'section'
331 bool user_defined_section_attribute = false;
333 /* Values of the -falign-* flags: how much to align labels in code.
334 0 means `use default', 1 means `don't align'.
335 For each variable, there is an _log variant which is the power
336 of two not less than the variable, for .align output. */
339 int align_loops_max_skip;
341 int align_jumps_max_skip;
342 int align_labels_log;
343 int align_labels_max_skip;
344 int align_functions_log;
348 const char *const string;
352 lang_independent_options;
354 /* Nonzero if subexpressions must be evaluated from left-to-right. */
355 int flag_evaluation_order = 0;
357 /* The user symbol prefix after having resolved same. */
358 const char *user_label_prefix;
360 static const param_info lang_independent_params[] = {
361 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
362 { OPTION, DEFAULT, false, MIN, MAX, HELP },
363 #include "params.def"
365 { NULL, 0, false, 0, 0, NULL }
368 /* Output files for assembler code (real compiler output)
369 and debugging dumps. */
373 FILE *dump_file = NULL;
374 const char *dump_file_name;
376 /* The current working directory of a translation. It's generally the
377 directory from which compilation was initiated, but a preprocessed
378 file may specify the original directory in which it was
381 static const char *src_pwd;
383 /* Initialize src_pwd with the given string, and return true. If it
384 was already initialized, return false. As a special case, it may
385 be called with a NULL argument to test whether src_pwd has NOT been
389 set_src_pwd (const char *pwd)
393 if (strcmp (src_pwd, pwd) == 0)
399 src_pwd = xstrdup (pwd);
403 /* Return the directory from which the translation unit was initiated,
404 in case set_src_pwd() was not called before to assign it a
420 /* Called when the start of a function definition is parsed,
421 this function prints on stderr the name of the function. */
423 announce_function (tree decl)
427 if (rtl_dump_and_exit)
428 fprintf (stderr, "%s ", IDENTIFIER_POINTER (DECL_NAME (decl)));
430 fprintf (stderr, " %s", lang_hooks.decl_printable_name (decl, 2));
432 pp_needs_newline (global_dc->printer) = true;
433 diagnostic_set_last_function (global_dc, (diagnostic_info *) NULL);
437 /* Initialize local_tick with the time of day, or -1 if
438 flag_random_seed is set. */
441 init_local_tick (void)
443 if (!flag_random_seed)
445 /* Get some more or less random data. */
446 #ifdef HAVE_GETTIMEOFDAY
450 gettimeofday (&tv, NULL);
451 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
455 time_t now = time (NULL);
457 if (now != (time_t)-1)
458 local_tick = (unsigned) now;
466 /* Set up a default flag_random_seed and local_tick, unless the user
467 already specified one. Must be called after init_local_tick. */
470 init_random_seed (void)
472 unsigned HOST_WIDE_INT value;
473 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
475 value = local_tick ^ getpid ();
477 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
478 flag_random_seed = random_seed;
481 /* Obtain the random_seed string. Unless NOINIT, initialize it if
482 it's not provided in the command line. */
485 get_random_seed (bool noinit)
487 if (!flag_random_seed && !noinit)
489 return flag_random_seed;
492 /* Modify the random_seed string to VAL. Return its previous
496 set_random_seed (const char *val)
498 const char *old = flag_random_seed;
499 flag_random_seed = val;
503 /* Decode the string P as an integral parameter.
504 If the string is indeed an integer return its numeric value else
505 issue an Invalid Option error for the option PNAME and return DEFVAL.
506 If PNAME is zero just return DEFVAL, do not call error. */
509 read_integral_parameter (const char *p, const char *pname, const int defval)
511 const char *endp = p;
524 error ("invalid option argument %qs", pname);
531 /* When compiling with a recent enough GCC, we use the GNU C "extern inline"
532 for floor_log2 and exact_log2; see toplev.h. That construct, however,
533 conflicts with the ISO C++ One Definition Rule. */
535 #if GCC_VERSION < 3004 || !defined (__cplusplus)
537 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
538 If X is 0, return -1. */
541 floor_log2 (unsigned HOST_WIDE_INT x)
549 t = HOST_BITS_PER_WIDE_INT - 1 - (int) CLZ_HWI (x);
551 if (HOST_BITS_PER_WIDE_INT > 64)
552 if (x >= (unsigned HOST_WIDE_INT) 1 << (t + 64))
554 if (HOST_BITS_PER_WIDE_INT > 32)
555 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 32))
557 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 16))
559 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 8))
561 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 4))
563 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 2))
565 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 1))
572 /* Return the logarithm of X, base 2, considering X unsigned,
573 if X is a power of 2. Otherwise, returns -1. */
576 exact_log2 (unsigned HOST_WIDE_INT x)
581 return x ? CTZ_HWI (x) : -1;
583 return floor_log2 (x);
587 #endif /* GCC_VERSION < 3004 || !defined (__cplusplus) */
589 /* Handler for fatal signals, such as SIGSEGV. These are transformed
590 into ICE messages, which is much more user friendly. In case the
591 error printer crashes, reset the signal to prevent infinite recursion. */
594 crash_signal (int signo)
596 signal (signo, SIG_DFL);
598 /* If we crashed while processing an ASM statement, then be a little more
599 graceful. It's most likely the user's fault. */
600 if (this_is_asm_operands)
602 output_operand_lossage ("unrecoverable error");
603 exit (FATAL_EXIT_CODE);
606 internal_error ("%s", strsignal (signo));
609 /* Arrange to dump core on error. (The regular error message is still
610 printed first, except in the case of abort().) */
613 setup_core_dumping (void)
616 signal (SIGABRT, SIG_DFL);
618 #if defined(HAVE_SETRLIMIT)
621 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
622 fatal_error ("getting core file size maximum limit: %m");
623 rlim.rlim_cur = rlim.rlim_max;
624 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
625 fatal_error ("setting core file size limit to maximum: %m");
628 diagnostic_abort_on_error (global_dc);
632 /* Strip off a legitimate source ending from the input string NAME of
633 length LEN. Rather than having to know the names used by all of
634 our front ends, we strip off an ending of a period followed by
635 up to five characters. (Java uses ".class".) */
638 strip_off_ending (char *name, int len)
641 for (i = 2; i < 6 && len > i; i++)
643 if (name[len - i] == '.')
645 name[len - i] = '\0';
651 /* Output a quoted string. */
654 output_quoted_string (FILE *asm_file, const char *string)
656 #ifdef OUTPUT_QUOTED_STRING
657 OUTPUT_QUOTED_STRING (asm_file, string);
661 putc ('\"', asm_file);
662 while ((c = *string++) != 0)
666 if (c == '\"' || c == '\\')
667 putc ('\\', asm_file);
671 fprintf (asm_file, "\\%03o", (unsigned char) c);
673 putc ('\"', asm_file);
677 /* Output a file name in the form wanted by System V. */
680 output_file_directive (FILE *asm_file, const char *input_name)
685 if (input_name == NULL)
686 input_name = "<stdin>";
688 input_name = remap_debug_filename (input_name);
690 len = strlen (input_name);
691 na = input_name + len;
693 /* NA gets INPUT_NAME sans directory names. */
694 while (na > input_name)
696 if (IS_DIR_SEPARATOR (na[-1]))
701 #ifdef ASM_OUTPUT_SOURCE_FILENAME
702 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
704 fprintf (asm_file, "\t.file\t");
705 output_quoted_string (asm_file, na);
706 fputc ('\n', asm_file);
710 /* A subroutine of wrapup_global_declarations. We've come to the end of
711 the compilation unit. All deferred variables should be undeferred,
712 and all incomplete decls should be finalized. */
715 wrapup_global_declaration_1 (tree decl)
717 /* We're not deferring this any longer. Assignment is conditional to
718 avoid needlessly dirtying PCH pages. */
719 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl), TS_DECL_WITH_VIS)
720 && DECL_DEFER_OUTPUT (decl) != 0)
721 DECL_DEFER_OUTPUT (decl) = 0;
723 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
724 lang_hooks.finish_incomplete_decl (decl);
727 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
728 needs to be output. Return true if it is output. */
731 wrapup_global_declaration_2 (tree decl)
733 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
736 /* Don't write out static consts, unless we still need them.
738 We also keep static consts if not optimizing (for debugging),
739 unless the user specified -fno-keep-static-consts.
740 ??? They might be better written into the debug information.
741 This is possible when using DWARF.
743 A language processor that wants static constants to be always
744 written out (even if it is not used) is responsible for
745 calling rest_of_decl_compilation itself. E.g. the C front-end
746 calls rest_of_decl_compilation from finish_decl.
747 One motivation for this is that is conventional in some
748 environments to write things like:
749 static const char rcsid[] = "... version string ...";
750 intending to force the string to be in the executable.
752 A language processor that would prefer to have unneeded
753 static constants "optimized away" would just defer writing
754 them out until here. E.g. C++ does this, because static
755 constants are often defined in header files.
757 ??? A tempting alternative (for both C and C++) would be
758 to force a constant to be written if and only if it is
759 defined in a main file, as opposed to an include file. */
761 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
763 struct varpool_node *node;
765 node = varpool_node (decl);
769 else if (node->alias)
771 else if (!cgraph_global_info_ready
773 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
775 else if (node->needed)
777 else if (DECL_COMDAT (decl))
779 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
780 && (optimize || !flag_keep_static_consts
781 || DECL_ARTIFICIAL (decl)))
786 rest_of_decl_compilation (decl, 1, 1);
794 /* Do any final processing required for the declarations in VEC, of
795 which there are LEN. We write out inline functions and variables
796 that have been deferred until this point, but which are required.
797 Returns nonzero if anything was put out. */
800 wrapup_global_declarations (tree *vec, int len)
802 bool reconsider, output_something = false;
805 for (i = 0; i < len; i++)
806 wrapup_global_declaration_1 (vec[i]);
808 /* Now emit any global variables or functions that we have been
809 putting off. We need to loop in case one of the things emitted
810 here references another one which comes earlier in the list. */
814 for (i = 0; i < len; i++)
815 reconsider |= wrapup_global_declaration_2 (vec[i]);
817 output_something = true;
821 return output_something;
824 /* A subroutine of check_global_declarations. Issue appropriate warnings
825 for the global declaration DECL. */
828 check_global_declaration_1 (tree decl)
830 /* Warn about any function declared static but not defined. We don't
831 warn about variables, because many programs have static variables
832 that exist only to get some text into the object file. */
833 if (TREE_CODE (decl) == FUNCTION_DECL
834 && DECL_INITIAL (decl) == 0
835 && DECL_EXTERNAL (decl)
836 && ! DECL_ARTIFICIAL (decl)
837 && ! TREE_NO_WARNING (decl)
838 && ! TREE_PUBLIC (decl)
839 && (warn_unused_function
840 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
842 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
843 pedwarn (input_location, 0, "%q+F used but never defined", decl);
845 warning (OPT_Wunused_function, "%q+F declared %<static%> but never defined", decl);
846 /* This symbol is effectively an "extern" declaration now. */
847 TREE_PUBLIC (decl) = 1;
848 assemble_external (decl);
851 /* Warn about static fns or vars defined but not used. */
852 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
853 /* We don't warn about "static const" variables because the
854 "rcs_id" idiom uses that construction. */
855 || (warn_unused_variable
856 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
857 && ! DECL_IN_SYSTEM_HEADER (decl)
858 && ! TREE_USED (decl)
859 /* The TREE_USED bit for file-scope decls is kept in the identifier,
860 to handle multiple external decls in different scopes. */
861 && ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl)))
862 && ! DECL_EXTERNAL (decl)
863 && ! TREE_PUBLIC (decl)
864 /* A volatile variable might be used in some non-obvious way. */
865 && ! TREE_THIS_VOLATILE (decl)
866 /* Global register variables must be declared to reserve them. */
867 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
868 /* Otherwise, ask the language. */
869 && lang_hooks.decls.warn_unused_global (decl))
870 warning ((TREE_CODE (decl) == FUNCTION_DECL)
871 ? OPT_Wunused_function
872 : OPT_Wunused_variable,
873 "%q+D defined but not used", decl);
876 /* Issue appropriate warnings for the global declarations in VEC (of
877 which there are LEN). */
880 check_global_declarations (tree *vec, int len)
884 for (i = 0; i < len; i++)
885 check_global_declaration_1 (vec[i]);
888 /* Emit debugging information for all global declarations in VEC. */
891 emit_debug_global_declarations (tree *vec, int len)
895 /* Avoid confusing the debug information machinery when there are errors. */
896 if (errorcount != 0 || sorrycount != 0)
899 timevar_push (TV_SYMOUT);
900 for (i = 0; i < len; i++)
901 debug_hooks->global_decl (vec[i]);
902 timevar_pop (TV_SYMOUT);
905 /* Warn about a use of an identifier which was marked deprecated. */
907 warn_deprecated_use (tree node)
909 if (node == 0 || !warn_deprecated_decl)
914 expanded_location xloc = expand_location (DECL_SOURCE_LOCATION (node));
915 warning (OPT_Wdeprecated_declarations,
916 "%qD is deprecated (declared at %s:%d)",
917 node, xloc.file, xloc.line);
919 else if (TYPE_P (node))
921 const char *what = NULL;
922 tree decl = TYPE_STUB_DECL (node);
924 if (TYPE_NAME (node))
926 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
927 what = IDENTIFIER_POINTER (TYPE_NAME (node));
928 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
929 && DECL_NAME (TYPE_NAME (node)))
930 what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (node)));
935 expanded_location xloc
936 = expand_location (DECL_SOURCE_LOCATION (decl));
938 warning (OPT_Wdeprecated_declarations,
939 "%qs is deprecated (declared at %s:%d)", what,
940 xloc.file, xloc.line);
942 warning (OPT_Wdeprecated_declarations,
943 "type is deprecated (declared at %s:%d)",
944 xloc.file, xloc.line);
949 warning (OPT_Wdeprecated_declarations, "%qs is deprecated", what);
951 warning (OPT_Wdeprecated_declarations, "type is deprecated");
956 /* Compile an entire translation unit. Write a file of assembly
957 output and various debugging dumps. */
962 /* Initialize yet another pass. */
964 ggc_protect_identifiers = true;
967 init_final (main_input_filename);
968 coverage_init (aux_base_name);
971 timevar_push (TV_PARSE);
973 /* Call the parser, which parses the entire file (calling
974 rest_of_compilation for each function). */
975 lang_hooks.parse_file (set_yydebug);
977 /* Compilation is now finished except for writing
978 what's left of the symbol table output. */
979 timevar_pop (TV_PARSE);
981 if (flag_syntax_only)
984 ggc_protect_identifiers = false;
986 lang_hooks.decls.final_write_globals ();
988 if (errorcount || sorrycount)
991 varpool_assemble_pending_decls ();
994 /* This must occur after the loop to output deferred functions.
995 Else the coverage initializer would not be emitted if all the
996 functions in this compilation unit were deferred. */
999 /* Likewise for mudflap static object registrations. */
1001 mudflap_finish_file ();
1003 /* Likewise for emulated thread-local storage. */
1004 if (!targetm.have_tls)
1007 output_shared_constant_pool ();
1008 output_object_blocks ();
1010 /* Write out any pending weak symbol declarations. */
1013 /* Do dbx symbols. */
1014 timevar_push (TV_SYMOUT);
1016 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
1017 if (dwarf2out_do_frame ())
1018 dwarf2out_frame_finish ();
1021 (*debug_hooks->finish) (main_input_filename);
1022 timevar_pop (TV_SYMOUT);
1024 /* Output some stuff at end of file if nec. */
1026 dw2_output_indirect_constants ();
1028 /* Flush any pending external directives. */
1029 process_pending_assemble_externals ();
1031 /* Attach a special .ident directive to the end of the file to identify
1032 the version of GCC which compiled this code. The format of the .ident
1033 string is patterned after the ones produced by native SVR4 compilers. */
1037 const char *pkg_version = "(GNU) ";
1039 if (strcmp ("(GCC) ", pkgversion_string))
1040 pkg_version = pkgversion_string;
1041 fprintf (asm_out_file, "%s\"GCC: %s%s\"\n",
1042 IDENT_ASM_OP, pkg_version, version_string);
1046 /* This must be at the end. Some target ports emit end of file directives
1047 into the assembly file here, and hence we can not output anything to the
1048 assembly file after this point. */
1049 targetm.asm_out.file_end ();
1052 /* Parse a -d... command line switch. */
1055 decode_d_option (const char *arg)
1066 flag_print_asm_name = 1;
1069 flag_dump_rtl_in_asm = 1;
1070 flag_print_asm_name = 1;
1073 graph_dump_format = vcg;
1076 rtl_dump_and_exit = 1;
1081 case 'D': /* These are handled by the preprocessor. */
1088 setup_core_dumping();
1091 enable_rtl_dump_file ();
1095 warning (0, "unrecognized gcc debugging option: %c", c);
1100 /* Indexed by enum debug_info_type. */
1101 const char *const debug_type_names[] =
1103 "none", "stabs", "coff", "dwarf-2", "xcoff", "vms"
1106 /* Print version information to FILE.
1107 Each line begins with INDENT (for the case where FILE is the
1108 assembler output file). */
1111 print_version (FILE *file, const char *indent)
1113 static const char fmt1[] =
1115 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
1117 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
1120 static const char fmt2[] =
1121 N_("GMP version %s, MPFR version %s.\n");
1122 static const char fmt3[] =
1123 N_("%s%swarning: %s header version %s differs from library version %s.\n");
1124 static const char fmt4[] =
1125 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
1127 #define __VERSION__ "[?]"
1130 file == stderr ? _(fmt1) : fmt1,
1131 indent, *indent != 0 ? " " : "",
1132 lang_hooks.name, pkgversion_string, version_string, TARGET_NAME,
1133 indent, __VERSION__);
1135 /* We need to stringify the GMP macro values. Ugh, gmp_version has
1136 two string formats, "i.j.k" and "i.j" when k is zero. */
1137 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
1138 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3(X)
1139 #if __GNU_MP_VERSION_PATCHLEVEL == 0
1140 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
1141 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR)
1143 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
1144 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) "." \
1145 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_PATCHLEVEL)
1148 file == stderr ? _(fmt2) : fmt2,
1149 GCC_GMP_STRINGIFY_VERSION, MPFR_VERSION_STRING);
1150 if (strcmp (GCC_GMP_STRINGIFY_VERSION, gmp_version))
1152 file == stderr ? _(fmt3) : fmt3,
1153 indent, *indent != 0 ? " " : "",
1154 "GMP", GCC_GMP_STRINGIFY_VERSION, gmp_version);
1155 if (strcmp (MPFR_VERSION_STRING, mpfr_get_version ()))
1157 file == stderr ? _(fmt3) : fmt3,
1158 indent, *indent != 0 ? " " : "",
1159 "MPFR", MPFR_VERSION_STRING, mpfr_get_version ());
1161 file == stderr ? _(fmt4) : fmt4,
1162 indent, *indent != 0 ? " " : "",
1163 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
1166 #ifdef ASM_COMMENT_START
1168 print_to_asm_out_file (print_switch_type type, const char * text)
1170 bool prepend_sep = true;
1174 case SWITCH_TYPE_LINE_END:
1175 putc ('\n', asm_out_file);
1178 case SWITCH_TYPE_LINE_START:
1179 fputs (ASM_COMMENT_START, asm_out_file);
1180 return strlen (ASM_COMMENT_START);
1182 case SWITCH_TYPE_DESCRIPTIVE:
1183 if (ASM_COMMENT_START[0] == 0)
1184 prepend_sep = false;
1186 case SWITCH_TYPE_PASSED:
1187 case SWITCH_TYPE_ENABLED:
1189 fputc (' ', asm_out_file);
1190 fprintf (asm_out_file, text);
1191 /* No need to return the length here as
1192 print_single_switch has already done it. */
1202 print_to_stderr (print_switch_type type, const char * text)
1206 case SWITCH_TYPE_LINE_END:
1207 putc ('\n', stderr);
1210 case SWITCH_TYPE_LINE_START:
1213 case SWITCH_TYPE_PASSED:
1214 case SWITCH_TYPE_ENABLED:
1215 fputc (' ', stderr);
1218 case SWITCH_TYPE_DESCRIPTIVE:
1219 fprintf (stderr, text);
1220 /* No need to return the length here as
1221 print_single_switch has already done it. */
1229 /* Print an option value and return the adjusted position in the line.
1230 ??? print_fn doesn't handle errors, eg disk full; presumably other
1231 code will catch a disk full though. */
1234 print_single_switch (print_switch_fn_type print_fn,
1236 print_switch_type type,
1239 /* The ultrix fprintf returns 0 on success, so compute the result
1240 we want here since we need it for the following test. The +1
1241 is for the separator character that will probably be emitted. */
1242 int len = strlen (text) + 1;
1245 && pos + len > MAX_LINE)
1247 print_fn (SWITCH_TYPE_LINE_END, NULL);
1252 pos += print_fn (SWITCH_TYPE_LINE_START, NULL);
1254 print_fn (type, text);
1258 /* Print active target switches using PRINT_FN.
1259 POS is the current cursor position and MAX is the size of a "line".
1260 Each line begins with INDENT and ends with TERM.
1261 Each switch is separated from the next by SEP. */
1264 print_switch_values (print_switch_fn_type print_fn)
1270 /* Fill in the -frandom-seed option, if the user didn't pass it, so
1271 that it can be printed below. This helps reproducibility. */
1272 if (!flag_random_seed)
1273 init_random_seed ();
1275 /* Print the options as passed. */
1276 pos = print_single_switch (print_fn, pos,
1277 SWITCH_TYPE_DESCRIPTIVE, _("options passed: "));
1279 for (p = &save_argv[1]; *p != NULL; p++)
1284 if (strcmp (*p, "-o") == 0
1285 || strcmp (*p, "-dumpbase") == 0
1286 || strcmp (*p, "-auxbase") == 0)
1293 if (strcmp (*p, "-quiet") == 0
1294 || strcmp (*p, "-version") == 0)
1301 pos = print_single_switch (print_fn, pos, SWITCH_TYPE_PASSED, *p);
1305 print_fn (SWITCH_TYPE_LINE_END, NULL);
1307 /* Print the -f and -m options that have been enabled.
1308 We don't handle language specific options but printing argv
1310 pos = print_single_switch (print_fn, 0,
1311 SWITCH_TYPE_DESCRIPTIVE, _("options enabled: "));
1313 for (j = 0; j < cl_options_count; j++)
1314 if ((cl_options[j].flags & CL_REPORT)
1315 && option_enabled (j) > 0)
1316 pos = print_single_switch (print_fn, pos,
1317 SWITCH_TYPE_ENABLED, cl_options[j].opt_text);
1319 print_fn (SWITCH_TYPE_LINE_END, NULL);
1322 /* Open assembly code output file. Do this even if -fsyntax-only is
1323 on, because then the driver will have provided the name of a
1324 temporary file or bit bucket for us. NAME is the file specified on
1325 the command line, possibly NULL. */
1327 init_asm_output (const char *name)
1329 if (name == NULL && asm_file_name == 0)
1330 asm_out_file = stdout;
1333 if (asm_file_name == 0)
1335 int len = strlen (dump_base_name);
1336 char *dumpname = XNEWVEC (char, len + 6);
1338 memcpy (dumpname, dump_base_name, len + 1);
1339 strip_off_ending (dumpname, len);
1340 strcat (dumpname, ".s");
1341 asm_file_name = dumpname;
1343 if (!strcmp (asm_file_name, "-"))
1344 asm_out_file = stdout;
1346 asm_out_file = fopen (asm_file_name, "w+b");
1347 if (asm_out_file == 0)
1348 fatal_error ("can%'t open %s for writing: %m", asm_file_name);
1351 if (!flag_syntax_only)
1353 targetm.asm_out.file_start ();
1355 if (flag_record_gcc_switches)
1357 if (targetm.asm_out.record_gcc_switches)
1359 /* Let the target know that we are about to start recording. */
1360 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
1362 /* Now record the switches. */
1363 print_switch_values (targetm.asm_out.record_gcc_switches);
1364 /* Let the target know that the recording is over. */
1365 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
1369 inform (input_location, "-frecord-gcc-switches is not supported by the current target");
1372 #ifdef ASM_COMMENT_START
1373 if (flag_verbose_asm)
1375 /* Print the list of switches in effect
1376 into the assembler file as comments. */
1377 print_version (asm_out_file, ASM_COMMENT_START);
1378 print_switch_values (print_to_asm_out_file);
1379 fprintf (asm_out_file, "\n");
1385 /* Return true if the state of option OPTION should be stored in PCH files
1386 and checked by default_pch_valid_p. Store the option's current state
1390 option_affects_pch_p (int option, struct cl_option_state *state)
1392 if ((cl_options[option].flags & CL_TARGET) == 0)
1394 if (cl_options[option].flag_var == &target_flags)
1395 if (targetm.check_pch_target_flags)
1397 return get_option_state (option, state);
1400 /* Default version of get_pch_validity.
1401 By default, every flag difference is fatal; that will be mostly right for
1402 most targets, but completely right for very few. */
1405 default_get_pch_validity (size_t *len)
1407 struct cl_option_state state;
1412 if (targetm.check_pch_target_flags)
1413 *len += sizeof (target_flags);
1414 for (i = 0; i < cl_options_count; i++)
1415 if (option_affects_pch_p (i, &state))
1418 result = r = XNEWVEC (char, *len);
1422 if (targetm.check_pch_target_flags)
1424 memcpy (r, &target_flags, sizeof (target_flags));
1425 r += sizeof (target_flags);
1428 for (i = 0; i < cl_options_count; i++)
1429 if (option_affects_pch_p (i, &state))
1431 memcpy (r, state.data, state.size);
1438 /* Return a message which says that a PCH file was created with a different
1439 setting of OPTION. */
1442 pch_option_mismatch (const char *option)
1446 asprintf (&r, _("created and used with differing settings of '%s'"), option);
1448 return _("out of memory");
1452 /* Default version of pch_valid_p. */
1455 default_pch_valid_p (const void *data_p, size_t len)
1457 struct cl_option_state state;
1458 const char *data = (const char *)data_p;
1461 /* -fpic and -fpie also usually make a PCH invalid. */
1462 if (data[0] != flag_pic)
1463 return _("created and used with different settings of -fpic");
1464 if (data[1] != flag_pie)
1465 return _("created and used with different settings of -fpie");
1468 /* Check target_flags. */
1469 if (targetm.check_pch_target_flags)
1474 memcpy (&tf, data, sizeof (target_flags));
1475 data += sizeof (target_flags);
1476 len -= sizeof (target_flags);
1477 r = targetm.check_pch_target_flags (tf);
1482 for (i = 0; i < cl_options_count; i++)
1483 if (option_affects_pch_p (i, &state))
1485 if (memcmp (data, state.data, state.size) != 0)
1486 return pch_option_mismatch (cl_options[i].opt_text);
1494 /* Default tree printer. Handles declarations only. */
1496 default_tree_printer (pretty_printer * pp, text_info *text, const char *spec,
1497 int precision, bool wide, bool set_locus, bool hash)
1501 /* FUTURE: %+x should set the locus. */
1502 if (precision != 0 || wide || hash)
1508 t = va_arg (*text->args_ptr, tree);
1509 if (DECL_DEBUG_EXPR_IS_FROM (t) && DECL_DEBUG_EXPR (t))
1510 t = DECL_DEBUG_EXPR (t);
1515 t = va_arg (*text->args_ptr, tree);
1522 if (set_locus && text->locus)
1523 *text->locus = DECL_SOURCE_LOCATION (t);
1527 const char *n = DECL_NAME (t)
1528 ? lang_hooks.decl_printable_name (t, 2)
1533 dump_generic_node (pp, t, 0, TDF_DIAGNOSTIC, 0);
1538 /* A helper function; used as the reallocator function for cpp's line
1541 realloc_for_line_map (void *ptr, size_t len)
1543 return ggc_realloc (ptr, len);
1546 /* Initialization of the front end environment, before command line
1547 options are parsed. Signal handlers, internationalization etc.
1548 ARGV0 is main's argv[0]. */
1550 general_init (const char *argv0)
1554 p = argv0 + strlen (argv0);
1555 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1559 xmalloc_set_program_name (progname);
1563 /* Unlock the stdio streams. */
1564 unlock_std_streams ();
1566 gcc_init_libintl ();
1568 /* Initialize the diagnostics reporting machinery, so option parsing
1569 can give warnings and errors. */
1570 diagnostic_initialize (global_dc);
1571 /* Set a default printer. Language specific initializations will
1572 override it later. */
1573 pp_format_decoder (global_dc->printer) = &default_tree_printer;
1575 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1577 signal (SIGSEGV, crash_signal);
1580 signal (SIGILL, crash_signal);
1583 signal (SIGBUS, crash_signal);
1586 signal (SIGABRT, crash_signal);
1588 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1589 signal (SIGIOT, crash_signal);
1592 signal (SIGFPE, crash_signal);
1595 /* Other host-specific signal setup. */
1596 (*host_hooks.extra_signals)();
1598 /* Initialize the garbage-collector, string pools and tree type hash
1602 line_table = GGC_NEW (struct line_maps);
1603 linemap_init (line_table);
1604 line_table->reallocator = realloc_for_line_map;
1607 /* Initialize register usage now so switches may override. */
1610 /* Register the language-independent parameters. */
1611 add_params (lang_independent_params, LAST_PARAM);
1613 /* This must be done after add_params but before argument processing. */
1614 init_ggc_heuristics();
1615 init_optimization_passes ();
1616 statistics_early_init ();
1619 /* Return true if the current target supports -fsection-anchors. */
1622 target_supports_section_anchors_p (void)
1624 if (targetm.min_anchor_offset == 0 && targetm.max_anchor_offset == 0)
1627 if (targetm.asm_out.output_anchor == NULL)
1633 /* Default the align_* variables to 1 if they're still unset, and
1634 set up the align_*_log variables. */
1636 init_alignments (void)
1638 if (align_loops <= 0)
1640 if (align_loops_max_skip > align_loops)
1641 align_loops_max_skip = align_loops - 1;
1642 align_loops_log = floor_log2 (align_loops * 2 - 1);
1643 if (align_jumps <= 0)
1645 if (align_jumps_max_skip > align_jumps)
1646 align_jumps_max_skip = align_jumps - 1;
1647 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1648 if (align_labels <= 0)
1650 align_labels_log = floor_log2 (align_labels * 2 - 1);
1651 if (align_labels_max_skip > align_labels)
1652 align_labels_max_skip = align_labels - 1;
1653 if (align_functions <= 0)
1654 align_functions = 1;
1655 align_functions_log = floor_log2 (align_functions * 2 - 1);
1658 /* Process the options that have been parsed. */
1660 process_options (void)
1662 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1663 This can happen with incorrect pre-processed input. */
1664 debug_hooks = &do_nothing_debug_hooks;
1666 /* This replaces set_Wunused. */
1667 if (warn_unused_function == -1)
1668 warn_unused_function = warn_unused;
1669 if (warn_unused_label == -1)
1670 warn_unused_label = warn_unused;
1671 /* Wunused-parameter is enabled if both -Wunused -Wextra are enabled. */
1672 if (warn_unused_parameter == -1)
1673 warn_unused_parameter = (warn_unused && extra_warnings);
1674 if (warn_unused_variable == -1)
1675 warn_unused_variable = warn_unused;
1676 if (warn_unused_value == -1)
1677 warn_unused_value = warn_unused;
1679 /* Allow the front end to perform consistency checks and do further
1680 initialization based on the command line options. This hook also
1681 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1682 so we can correctly initialize debug output. */
1683 no_backend = lang_hooks.post_options (&main_input_filename);
1685 #ifdef OVERRIDE_OPTIONS
1686 /* Some machines may reject certain combinations of options. */
1690 if (flag_section_anchors && !target_supports_section_anchors_p ())
1692 warning (OPT_fsection_anchors,
1693 "this target does not support %qs", "-fsection-anchors");
1694 flag_section_anchors = 0;
1697 if (flag_short_enums == 2)
1698 flag_short_enums = targetm.default_short_enums ();
1700 /* Set aux_base_name if not already set. */
1703 else if (main_input_filename)
1705 char *name = xstrdup (lbasename (main_input_filename));
1707 strip_off_ending (name, strlen (name));
1708 aux_base_name = name;
1711 aux_base_name = "gccaux";
1716 || flag_loop_interchange
1717 || flag_loop_strip_mine
1718 || flag_graphite_identity)
1719 sorry ("Graphite loop optimizations cannot be used");
1722 /* Unrolling all loops implies that standard loop unrolling must also
1724 if (flag_unroll_all_loops)
1725 flag_unroll_loops = 1;
1727 /* The loop unrolling code assumes that cse will be run after loop.
1728 web and rename-registers also help when run after loop unrolling. */
1730 if (flag_rerun_cse_after_loop == AUTODETECT_VALUE)
1731 flag_rerun_cse_after_loop = flag_unroll_loops || flag_peel_loops;
1732 if (flag_web == AUTODETECT_VALUE)
1733 flag_web = flag_unroll_loops || flag_peel_loops;
1734 if (flag_rename_registers == AUTODETECT_VALUE)
1735 flag_rename_registers = flag_unroll_loops || flag_peel_loops;
1737 if (flag_non_call_exceptions)
1738 flag_asynchronous_unwind_tables = 1;
1739 if (flag_asynchronous_unwind_tables)
1740 flag_unwind_tables = 1;
1742 if (flag_value_profile_transformations)
1743 flag_profile_values = 1;
1745 /* Warn about options that are not supported on this machine. */
1746 #ifndef INSN_SCHEDULING
1747 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1748 warning (0, "instruction scheduling not supported on this target machine");
1751 if (flag_delayed_branch)
1752 warning (0, "this target machine does not have delayed branches");
1755 user_label_prefix = USER_LABEL_PREFIX;
1756 if (flag_leading_underscore != -1)
1758 /* If the default prefix is more complicated than "" or "_",
1759 issue a warning and ignore this option. */
1760 if (user_label_prefix[0] == 0 ||
1761 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1763 user_label_prefix = flag_leading_underscore ? "_" : "";
1766 warning (0, "-f%sleading-underscore not supported on this target machine",
1767 flag_leading_underscore ? "" : "no-");
1770 /* If we are in verbose mode, write out the version and maybe all the
1771 option flags in use. */
1774 print_version (stderr, "");
1776 print_switch_values (print_to_stderr);
1779 if (flag_syntax_only)
1781 write_symbols = NO_DEBUG;
1785 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1787 if (debug_info_level == DINFO_LEVEL_NONE)
1788 write_symbols = NO_DEBUG;
1790 /* Now we know write_symbols, set up the debug hooks based on it.
1791 By default we do nothing for debug output. */
1792 if (PREFERRED_DEBUGGING_TYPE == NO_DEBUG)
1793 default_debug_hooks = &do_nothing_debug_hooks;
1794 #if defined(DBX_DEBUGGING_INFO)
1795 else if (PREFERRED_DEBUGGING_TYPE == DBX_DEBUG)
1796 default_debug_hooks = &dbx_debug_hooks;
1798 #if defined(XCOFF_DEBUGGING_INFO)
1799 else if (PREFERRED_DEBUGGING_TYPE == XCOFF_DEBUG)
1800 default_debug_hooks = &xcoff_debug_hooks;
1802 #ifdef SDB_DEBUGGING_INFO
1803 else if (PREFERRED_DEBUGGING_TYPE == SDB_DEBUG)
1804 default_debug_hooks = &sdb_debug_hooks;
1806 #ifdef DWARF2_DEBUGGING_INFO
1807 else if (PREFERRED_DEBUGGING_TYPE == DWARF2_DEBUG)
1808 default_debug_hooks = &dwarf2_debug_hooks;
1810 #ifdef VMS_DEBUGGING_INFO
1811 else if (PREFERRED_DEBUGGING_TYPE == VMS_DEBUG
1812 || PREFERRED_DEBUGGING_TYPE == VMS_AND_DWARF2_DEBUG)
1813 default_debug_hooks = &vmsdbg_debug_hooks;
1816 if (write_symbols == NO_DEBUG)
1818 #if defined(DBX_DEBUGGING_INFO)
1819 else if (write_symbols == DBX_DEBUG)
1820 debug_hooks = &dbx_debug_hooks;
1822 #if defined(XCOFF_DEBUGGING_INFO)
1823 else if (write_symbols == XCOFF_DEBUG)
1824 debug_hooks = &xcoff_debug_hooks;
1826 #ifdef SDB_DEBUGGING_INFO
1827 else if (write_symbols == SDB_DEBUG)
1828 debug_hooks = &sdb_debug_hooks;
1830 #ifdef DWARF2_DEBUGGING_INFO
1831 else if (write_symbols == DWARF2_DEBUG)
1832 debug_hooks = &dwarf2_debug_hooks;
1834 #ifdef VMS_DEBUGGING_INFO
1835 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1836 debug_hooks = &vmsdbg_debug_hooks;
1839 error ("target system does not support the \"%s\" debug format",
1840 debug_type_names[write_symbols]);
1842 /* Now we know which debug output will be used so we can set
1843 flag_var_tracking, flag_rename_registers if the user has
1844 not specified them. */
1845 if (debug_info_level < DINFO_LEVEL_NORMAL
1846 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
1848 if (flag_var_tracking == 1
1849 || flag_var_tracking_uninit == 1)
1851 if (debug_info_level < DINFO_LEVEL_NORMAL)
1852 warning (0, "variable tracking requested, but useless unless "
1853 "producing debug info");
1855 warning (0, "variable tracking requested, but not supported "
1856 "by this debug format");
1858 flag_var_tracking = 0;
1859 flag_var_tracking_uninit = 0;
1862 if (flag_rename_registers == AUTODETECT_VALUE)
1863 flag_rename_registers = default_debug_hooks->var_location
1864 != do_nothing_debug_hooks.var_location;
1866 if (flag_var_tracking == AUTODETECT_VALUE)
1867 flag_var_tracking = optimize >= 1;
1869 if (flag_tree_cselim == AUTODETECT_VALUE)
1870 #ifdef HAVE_conditional_move
1871 flag_tree_cselim = 1;
1873 flag_tree_cselim = 0;
1876 /* If the user specifically requested variable tracking with tagging
1877 uninitialized variables, we need to turn on variable tracking.
1878 (We already determined above that variable tracking is feasible.) */
1879 if (flag_var_tracking_uninit)
1880 flag_var_tracking = 1;
1882 /* If auxiliary info generation is desired, open the output file.
1883 This goes in the same directory as the source file--unlike
1884 all the other output files. */
1885 if (flag_gen_aux_info)
1887 aux_info_file = fopen (aux_info_file_name, "w");
1888 if (aux_info_file == 0)
1889 fatal_error ("can%'t open %s: %m", aux_info_file_name);
1892 if (! targetm.have_named_sections)
1894 if (flag_function_sections)
1896 warning (0, "-ffunction-sections not supported for this target");
1897 flag_function_sections = 0;
1899 if (flag_data_sections)
1901 warning (0, "-fdata-sections not supported for this target");
1902 flag_data_sections = 0;
1906 if (flag_function_sections && profile_flag)
1908 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
1909 flag_function_sections = 0;
1912 #ifndef HAVE_prefetch
1913 if (flag_prefetch_loop_arrays)
1915 warning (0, "-fprefetch-loop-arrays not supported for this target");
1916 flag_prefetch_loop_arrays = 0;
1919 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
1921 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1922 flag_prefetch_loop_arrays = 0;
1926 /* This combination of options isn't handled for i386 targets and doesn't
1927 make much sense anyway, so don't allow it. */
1928 if (flag_prefetch_loop_arrays && optimize_size)
1930 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1931 flag_prefetch_loop_arrays = 0;
1934 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1935 if (flag_signaling_nans)
1936 flag_trapping_math = 1;
1938 /* We cannot reassociate if we want traps or signed zeros. Â */
1939 if (flag_associative_math && (flag_trapping_math || flag_signed_zeros))
1941 warning (0, "-fassociative-math disabled; other options take precedence");
1942 flag_associative_math = 0;
1945 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1946 if (flag_cx_limited_range)
1947 flag_complex_method = 0;
1949 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1950 if (flag_cx_fortran_rules)
1951 flag_complex_method = 1;
1953 /* Targets must be able to place spill slots at lower addresses. If the
1954 target already uses a soft frame pointer, the transition is trivial. */
1955 if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
1957 warning (0, "-fstack-protector not supported for this target");
1958 flag_stack_protect = 0;
1960 if (!flag_stack_protect)
1961 warn_stack_protect = 0;
1963 /* ??? Unwind info is not correct around the CFG unless either a frame
1964 pointer is present or A_O_A is set. Fixing this requires rewriting
1965 unwind info generation to be aware of the CFG and propagating states
1967 if (flag_unwind_tables && !ACCUMULATE_OUTGOING_ARGS
1968 && flag_omit_frame_pointer)
1970 warning (0, "unwind tables currently require a frame pointer "
1972 flag_omit_frame_pointer = 0;
1976 /* This function can be called multiple times to reinitialize the compiler
1977 back end when register classes or instruction sets have changed,
1978 before each function. */
1980 backend_init_target (void)
1982 /* Initialize alignment variables. */
1985 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
1986 to initialize reg_raw_mode[]. */
1989 /* This invokes target hooks to set fixed_reg[] etc, which is
1993 /* This depends on stack_pointer_rtx. */
1994 init_fake_stack_mems ();
1996 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1998 init_alias_target ();
2000 /* Depends on HARD_FRAME_POINTER_REGNUM. */
2003 /* The following initialization functions need to generate rtl, so
2004 provide a dummy function context for them. */
2005 init_dummy_function_start ();
2007 /* rtx_cost is mode-dependent, so cached values need to be recomputed
2008 on a mode change. */
2011 /* We may need to recompute regno_save_code[] and regno_restore_code[]
2012 after a mode change as well. */
2013 if (flag_caller_saves)
2014 init_caller_save ();
2015 expand_dummy_function_end ();
2018 /* Initialize the compiler back end. This function is called only once,
2019 when starting the compiler. */
2023 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
2024 || debug_info_level == DINFO_LEVEL_VERBOSE
2025 #ifdef VMS_DEBUGGING_INFO
2026 /* Enable line number info for traceback. */
2027 || debug_info_level > DINFO_LEVEL_NONE
2029 || flag_test_coverage);
2032 init_inline_once ();
2033 init_varasm_once ();
2034 save_register_info ();
2036 /* Initialize the target-specific back end pieces. */
2038 backend_init_target ();
2041 /* Initialize excess precision settings. */
2043 init_excess_precision (void)
2045 /* Adjust excess precision handling based on the target options. If
2046 the front end cannot handle it, flag_excess_precision_cmdline
2047 will already have been set accordingly in the post_options
2049 gcc_assert (flag_excess_precision_cmdline != EXCESS_PRECISION_DEFAULT);
2050 flag_excess_precision = flag_excess_precision_cmdline;
2051 if (flag_unsafe_math_optimizations)
2052 flag_excess_precision = EXCESS_PRECISION_FAST;
2053 if (flag_excess_precision == EXCESS_PRECISION_STANDARD)
2055 int flt_eval_method = TARGET_FLT_EVAL_METHOD;
2056 switch (flt_eval_method)
2060 /* Either the target acts unpredictably (-1) or has all the
2061 operations required not to have excess precision (0). */
2062 flag_excess_precision = EXCESS_PRECISION_FAST;
2066 /* In these cases, predictable excess precision makes
2070 /* Any other implementation-defined FLT_EVAL_METHOD values
2071 require the compiler to handle the associated excess
2072 precision rules in excess_precision_type. */
2078 /* Initialize things that are both lang-dependent and target-dependent.
2079 This function can be called more than once if target parameters change. */
2081 lang_dependent_init_target (void)
2083 /* This determines excess precision settings. */
2084 init_excess_precision ();
2086 /* This creates various _DECL nodes, so needs to be called after the
2087 front end is initialized. It also depends on the HAVE_xxx macros
2088 generated from the target machine description. */
2091 /* The following initialization functions need to generate rtl, so
2092 provide a dummy function context for them. */
2093 init_dummy_function_start ();
2095 /* Do the target-specific parts of expr initialization. */
2096 init_expr_target ();
2098 /* Although the actions of these functions are language-independent,
2099 they use optabs, so we cannot call them from backend_init. */
2103 expand_dummy_function_end ();
2106 /* Language-dependent initialization. Returns nonzero on success. */
2108 lang_dependent_init (const char *name)
2110 location_t save_loc = input_location;
2111 if (dump_base_name == 0)
2112 dump_base_name = name && name[0] ? name : "gccdump";
2114 /* Other front-end initialization. */
2115 input_location = BUILTINS_LOCATION;
2116 if (lang_hooks.init () == 0)
2118 input_location = save_loc;
2120 init_asm_output (name);
2122 /* This creates various _DECL nodes, so needs to be called after the
2123 front end is initialized. */
2126 /* Do the target-specific parts of the initialization. */
2127 lang_dependent_init_target ();
2129 /* If dbx symbol table desired, initialize writing it and output the
2130 predefined types. */
2131 timevar_push (TV_SYMOUT);
2133 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
2134 if (dwarf2out_do_frame ())
2135 dwarf2out_frame_init ();
2138 /* Now we have the correct original filename, we can initialize
2140 (*debug_hooks->init) (name);
2142 timevar_pop (TV_SYMOUT);
2148 /* Reinitialize everything when target parameters, such as register usage,
2151 target_reinit (void)
2153 /* Reinitialize RTL backend. */
2154 backend_init_target ();
2156 /* Reinitialize lang-dependent parts. */
2157 lang_dependent_init_target ();
2161 dump_memory_report (bool final)
2163 ggc_print_statistics ();
2164 stringpool_statistics ();
2165 dump_tree_statistics ();
2166 dump_gimple_statistics ();
2167 dump_rtx_statistics ();
2168 dump_varray_statistics ();
2169 dump_alloc_pool_statistics ();
2170 dump_bitmap_statistics ();
2171 dump_vec_loc_statistics ();
2172 dump_ggc_loc_statistics (final);
2175 /* Clean up: close opened files, etc. */
2180 /* Close the dump files. */
2181 if (flag_gen_aux_info)
2183 fclose (aux_info_file);
2185 unlink (aux_info_file_name);
2188 /* Close non-debugging input and output files. Take special care to note
2189 whether fclose returns an error, since the pages might still be on the
2190 buffer chain while the file is open. */
2194 if (ferror (asm_out_file) != 0)
2195 fatal_error ("error writing to %s: %m", asm_file_name);
2196 if (fclose (asm_out_file) != 0)
2197 fatal_error ("error closing %s: %m", asm_file_name);
2201 finish_optimization_passes ();
2206 dump_memory_report (true);
2208 /* Language-specific end of compilation actions. */
2209 lang_hooks.finish ();
2212 /* Initialize the compiler, and compile the input file. */
2216 /* Initialize timing first. The C front ends read the main file in
2217 the post_options hook, and C++ does file timings. */
2218 if (time_report || !quiet_flag || flag_detailed_statistics)
2220 timevar_start (TV_TOTAL);
2224 /* Don't do any more if an error has already occurred. */
2227 /* This must be run always, because it is needed to compute the FP
2228 predefined macros, such as __LDBL_MAX__, for targets using non
2229 default FP formats. */
2230 init_adjust_machine_modes ();
2232 /* Set up the back-end if requested. */
2236 /* Language-dependent initialization. Returns true on success. */
2237 if (lang_dependent_init (main_input_filename))
2243 /* Stop timing and print the times. */
2244 timevar_stop (TV_TOTAL);
2245 timevar_print (stderr);
2248 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2249 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2250 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2252 It is not safe to call this function more than once. */
2255 toplev_main (unsigned int argc, const char **argv)
2259 /* Initialization of GCC's environment, and diagnostics. */
2260 general_init (argv[0]);
2262 /* Parse the options and do minimal processing; basically just
2263 enough to default flags appropriately. */
2264 decode_options (argc, argv);
2268 /* Exit early if we can (e.g. -help). */
2269 if (!exit_after_options)
2272 if (warningcount || errorcount)
2273 print_ignored_options ();
2275 if (errorcount || sorrycount)
2276 return (FATAL_EXIT_CODE);
2278 return (SUCCESS_EXIT_CODE);