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"
69 #include "dwarf2asm.h"
70 #include "integrate.h"
74 #include "langhooks.h"
75 #include "cfglayout.h"
77 #include "hosthooks.h"
81 #include "value-prof.h"
82 #include "alloc-pool.h"
83 #include "tree-mudflap.h"
84 #include "tree-pass.h"
86 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
87 #include "dwarf2out.h"
90 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
94 #ifdef SDB_DEBUGGING_INFO
98 #ifdef XCOFF_DEBUGGING_INFO
99 #include "xcoffout.h" /* Needed for external data
100 declarations for e.g. AIX 4.x. */
103 static void general_init (const char *);
104 static void do_compile (void);
105 static void process_options (void);
106 static void backend_init (void);
107 static int lang_dependent_init (const char *);
108 static void init_asm_output (const char *);
109 static void finalize (void);
111 static void crash_signal (int) ATTRIBUTE_NORETURN;
112 static void setup_core_dumping (void);
113 static void compile_file (void);
115 /* Nonzero to dump debug info whilst parsing (-dy option). */
116 static int set_yydebug;
118 /* True if we don't need a backend (e.g. preprocessing only). */
119 static bool no_backend;
121 /* Length of line when printing switch values. */
124 /* Name of program invoked, sans directories. */
126 const char *progname;
128 /* Copy of argument vector to toplev_main. */
129 static const char **save_argv;
131 /* Name of top-level original source file (what was input to cpp).
132 This comes from the #-command at the beginning of the actual input.
133 If there isn't any there, then this is the cc1 input file name. */
135 const char *main_input_filename;
137 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
138 to optimize and default_debug_hooks in process_options (). */
139 #define AUTODETECT_VALUE 2
141 /* Current position in real source file. */
143 location_t input_location;
145 struct line_maps *line_table;
147 /* Name to use as base of names for dump output files. */
149 const char *dump_base_name;
151 /* Name to use as a base for auxiliary output files. */
153 const char *aux_base_name;
155 /* Prefix for profile data files */
156 const char *profile_data_prefix;
158 /* A mask of target_flags that includes bit X if X was set or cleared
159 on the command line. */
161 int target_flags_explicit;
163 /* Debug hooks - dependent upon command line options. */
165 const struct gcc_debug_hooks *debug_hooks;
167 /* Debug hooks - target default. */
169 static const struct gcc_debug_hooks *default_debug_hooks;
171 /* Other flags saying which kinds of debugging dump have been requested. */
173 int rtl_dump_and_exit;
174 int flag_print_asm_name;
175 enum graph_dump_types graph_dump_format;
177 /* Name for output file of assembly code, specified with -o. */
179 const char *asm_file_name;
181 /* Nonzero means do optimizations. -O.
182 Particular numeric values stand for particular amounts of optimization;
183 thus, -O2 stores 2 here. However, the optimizations beyond the basic
184 ones are not controlled directly by this variable. Instead, they are
185 controlled by individual `flag_...' variables that are defaulted
186 based on this variable. */
190 /* Nonzero means optimize for size. -Os.
191 The only valid values are zero and nonzero. When optimize_size is
192 nonzero, optimize defaults to 2, but certain individual code
193 bloating optimizations are disabled. */
195 int optimize_size = 0;
197 /* The FUNCTION_DECL for the function currently being compiled,
198 or 0 if between functions. */
199 tree current_function_decl;
201 /* Set to the FUNC_BEGIN label of the current function, or NULL
203 const char * current_function_func_begin_label;
205 /* Nonzero means to collect statistics which might be expensive
206 and to print them when we are done. */
207 int flag_detailed_statistics = 0;
209 /* A random sequence of characters, unless overridden by user. */
210 static const char *flag_random_seed;
212 /* A local time stamp derived from the time of compilation. It will be
213 zero if the system cannot provide a time. It will be -1u, if the
214 user has specified a particular random seed. */
219 /* Nonzero means `char' should be signed. */
221 int flag_signed_char;
223 /* Nonzero means give an enum type only as many bytes as it needs. A value
224 of 2 means it has not yet been initialized. */
226 int flag_short_enums;
228 /* Nonzero if structures and unions should be returned in memory.
230 This should only be defined if compatibility with another compiler or
231 with an ABI is needed, because it results in slower code. */
233 #ifndef DEFAULT_PCC_STRUCT_RETURN
234 #define DEFAULT_PCC_STRUCT_RETURN 1
237 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
239 int flag_pcc_struct_return = DEFAULT_PCC_STRUCT_RETURN;
241 /* 0 means straightforward implementation of complex divide acceptable.
242 1 means wide ranges of inputs must work for complex divide.
243 2 means C99-like requirements for complex multiply and divide. */
245 int flag_complex_method = 1;
247 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
248 not just because the tree inliner turned us off. */
250 int flag_really_no_inline = 2;
252 /* Nonzero means we should be saving declaration info into a .X file. */
254 int flag_gen_aux_info = 0;
256 /* Specified name of aux-info file. */
258 const char *aux_info_file_name;
260 /* Nonzero if we are compiling code for a shared library, zero for
265 /* Generate code for GNU or NeXT Objective-C runtime environment. */
267 #ifdef NEXT_OBJC_RUNTIME
268 int flag_next_runtime = 1;
270 int flag_next_runtime = 0;
273 /* Set to the default thread-local storage (tls) model to use. */
275 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
277 /* Nonzero means change certain warnings into errors.
278 Usually these are warnings about failure to conform to some standard. */
280 int flag_pedantic_errors = 0;
282 /* Nonzero means make permerror produce warnings instead of errors. */
284 int flag_permissive = 0;
286 /* -dA causes debug commentary information to be produced in
287 the generated assembly code (to make it more readable). This option
288 is generally only of use to those who actually need to read the
289 generated assembly code (perhaps while debugging the compiler itself).
290 Currently, this switch is only used by dwarfout.c; however, it is intended
291 to be a catchall for printing debug information in the assembler file. */
293 int flag_debug_asm = 0;
295 /* -dP causes the rtl to be emitted as a comment in assembly. */
297 int flag_dump_rtl_in_asm = 0;
299 /* When non-NULL, indicates that whenever space is allocated on the
300 stack, the resulting stack pointer must not pass this
301 address---that is, for stacks that grow downward, the stack pointer
302 must always be greater than or equal to this address; for stacks
303 that grow upward, the stack pointer must be less than this address.
304 At present, the rtx may be either a REG or a SYMBOL_REF, although
305 the support provided depends on the backend. */
308 /* Nonzero if we should track variables. When
309 flag_var_tracking == AUTODETECT_VALUE it will be set according
310 to optimize, debug_info_level and debug_hooks in process_options (). */
311 int flag_var_tracking = AUTODETECT_VALUE;
313 /* True if the user has tagged the function with the 'section'
316 bool user_defined_section_attribute = false;
318 /* Values of the -falign-* flags: how much to align labels in code.
319 0 means `use default', 1 means `don't align'.
320 For each variable, there is an _log variant which is the power
321 of two not less than the variable, for .align output. */
324 int align_loops_max_skip;
326 int align_jumps_max_skip;
327 int align_labels_log;
328 int align_labels_max_skip;
329 int align_functions_log;
333 const char *const string;
337 lang_independent_options;
339 /* Nonzero if subexpressions must be evaluated from left-to-right. */
340 int flag_evaluation_order = 0;
342 /* The user symbol prefix after having resolved same. */
343 const char *user_label_prefix;
345 static const param_info lang_independent_params[] = {
346 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
347 { OPTION, DEFAULT, false, MIN, MAX, HELP },
348 #include "params.def"
350 { NULL, 0, false, 0, 0, NULL }
353 /* Output files for assembler code (real compiler output)
354 and debugging dumps. */
358 FILE *dump_file = NULL;
359 const char *dump_file_name;
361 /* The current working directory of a translation. It's generally the
362 directory from which compilation was initiated, but a preprocessed
363 file may specify the original directory in which it was
366 static const char *src_pwd;
368 /* Initialize src_pwd with the given string, and return true. If it
369 was already initialized, return false. As a special case, it may
370 be called with a NULL argument to test whether src_pwd has NOT been
374 set_src_pwd (const char *pwd)
378 if (strcmp (src_pwd, pwd) == 0)
384 src_pwd = xstrdup (pwd);
388 /* Return the directory from which the translation unit was initiated,
389 in case set_src_pwd() was not called before to assign it a
405 /* Called when the start of a function definition is parsed,
406 this function prints on stderr the name of the function. */
408 announce_function (tree decl)
412 if (rtl_dump_and_exit)
413 fprintf (stderr, "%s ", IDENTIFIER_POINTER (DECL_NAME (decl)));
415 fprintf (stderr, " %s", lang_hooks.decl_printable_name (decl, 2));
417 pp_needs_newline (global_dc->printer) = true;
418 diagnostic_set_last_function (global_dc, (diagnostic_info *) NULL);
422 /* Initialize local_tick with the time of day, or -1 if
423 flag_random_seed is set. */
426 init_local_tick (void)
428 if (!flag_random_seed)
430 /* Get some more or less random data. */
431 #ifdef HAVE_GETTIMEOFDAY
435 gettimeofday (&tv, NULL);
436 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
440 time_t now = time (NULL);
442 if (now != (time_t)-1)
443 local_tick = (unsigned) now;
451 /* Set up a default flag_random_seed and local_tick, unless the user
452 already specified one. Must be called after init_local_tick. */
455 init_random_seed (void)
457 unsigned HOST_WIDE_INT value;
458 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
460 value = local_tick ^ getpid ();
462 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
463 flag_random_seed = random_seed;
466 /* Obtain the random_seed string. Unless NOINIT, initialize it if
467 it's not provided in the command line. */
470 get_random_seed (bool noinit)
472 if (!flag_random_seed && !noinit)
474 return flag_random_seed;
477 /* Modify the random_seed string to VAL. Return its previous
481 set_random_seed (const char *val)
483 const char *old = flag_random_seed;
484 flag_random_seed = val;
488 /* Decode the string P as an integral parameter.
489 If the string is indeed an integer return its numeric value else
490 issue an Invalid Option error for the option PNAME and return DEFVAL.
491 If PNAME is zero just return DEFVAL, do not call error. */
494 read_integral_parameter (const char *p, const char *pname, const int defval)
496 const char *endp = p;
509 error ("invalid option argument %qs", pname);
516 /* When compiling with a recent enough GCC, we use the GNU C "extern inline"
517 for floor_log2 and exact_log2; see toplev.h. That construct, however,
518 conflicts with the ISO C++ One Definition Rule. */
520 #if GCC_VERSION < 3004 || !defined (__cplusplus)
522 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
523 If X is 0, return -1. */
526 floor_log2 (unsigned HOST_WIDE_INT x)
534 t = HOST_BITS_PER_WIDE_INT - 1 - (int) CLZ_HWI (x);
536 if (HOST_BITS_PER_WIDE_INT > 64)
537 if (x >= (unsigned HOST_WIDE_INT) 1 << (t + 64))
539 if (HOST_BITS_PER_WIDE_INT > 32)
540 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 32))
542 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 16))
544 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 8))
546 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 4))
548 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 2))
550 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 1))
557 /* Return the logarithm of X, base 2, considering X unsigned,
558 if X is a power of 2. Otherwise, returns -1. */
561 exact_log2 (unsigned HOST_WIDE_INT x)
566 return x ? CTZ_HWI (x) : -1;
568 return floor_log2 (x);
572 #endif /* GCC_VERSION < 3004 || !defined (__cplusplus) */
574 /* Handler for fatal signals, such as SIGSEGV. These are transformed
575 into ICE messages, which is much more user friendly. In case the
576 error printer crashes, reset the signal to prevent infinite recursion. */
579 crash_signal (int signo)
581 signal (signo, SIG_DFL);
583 /* If we crashed while processing an ASM statement, then be a little more
584 graceful. It's most likely the user's fault. */
585 if (this_is_asm_operands)
587 output_operand_lossage ("unrecoverable error");
588 exit (FATAL_EXIT_CODE);
591 internal_error ("%s", strsignal (signo));
594 /* Arrange to dump core on error. (The regular error message is still
595 printed first, except in the case of abort().) */
598 setup_core_dumping (void)
601 signal (SIGABRT, SIG_DFL);
603 #if defined(HAVE_SETRLIMIT)
606 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
607 fatal_error ("getting core file size maximum limit: %m");
608 rlim.rlim_cur = rlim.rlim_max;
609 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
610 fatal_error ("setting core file size limit to maximum: %m");
613 diagnostic_abort_on_error (global_dc);
617 /* Strip off a legitimate source ending from the input string NAME of
618 length LEN. Rather than having to know the names used by all of
619 our front ends, we strip off an ending of a period followed by
620 up to five characters. (Java uses ".class".) */
623 strip_off_ending (char *name, int len)
626 for (i = 2; i < 6 && len > i; i++)
628 if (name[len - i] == '.')
630 name[len - i] = '\0';
636 /* Output a quoted string. */
639 output_quoted_string (FILE *asm_file, const char *string)
641 #ifdef OUTPUT_QUOTED_STRING
642 OUTPUT_QUOTED_STRING (asm_file, string);
646 putc ('\"', asm_file);
647 while ((c = *string++) != 0)
651 if (c == '\"' || c == '\\')
652 putc ('\\', asm_file);
656 fprintf (asm_file, "\\%03o", (unsigned char) c);
658 putc ('\"', asm_file);
662 /* Output a file name in the form wanted by System V. */
665 output_file_directive (FILE *asm_file, const char *input_name)
670 if (input_name == NULL)
671 input_name = "<stdin>";
673 input_name = remap_debug_filename (input_name);
675 len = strlen (input_name);
676 na = input_name + len;
678 /* NA gets INPUT_NAME sans directory names. */
679 while (na > input_name)
681 if (IS_DIR_SEPARATOR (na[-1]))
686 #ifdef ASM_OUTPUT_SOURCE_FILENAME
687 ASM_OUTPUT_SOURCE_FILENAME (asm_file, na);
689 fprintf (asm_file, "\t.file\t");
690 output_quoted_string (asm_file, na);
691 fputc ('\n', asm_file);
695 /* A subroutine of wrapup_global_declarations. We've come to the end of
696 the compilation unit. All deferred variables should be undeferred,
697 and all incomplete decls should be finalized. */
700 wrapup_global_declaration_1 (tree decl)
702 /* We're not deferring this any longer. Assignment is conditional to
703 avoid needlessly dirtying PCH pages. */
704 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl), TS_DECL_WITH_VIS)
705 && DECL_DEFER_OUTPUT (decl) != 0)
706 DECL_DEFER_OUTPUT (decl) = 0;
708 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
709 lang_hooks.finish_incomplete_decl (decl);
712 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
713 needs to be output. Return true if it is output. */
716 wrapup_global_declaration_2 (tree decl)
718 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
721 /* Don't write out static consts, unless we still need them.
723 We also keep static consts if not optimizing (for debugging),
724 unless the user specified -fno-keep-static-consts.
725 ??? They might be better written into the debug information.
726 This is possible when using DWARF.
728 A language processor that wants static constants to be always
729 written out (even if it is not used) is responsible for
730 calling rest_of_decl_compilation itself. E.g. the C front-end
731 calls rest_of_decl_compilation from finish_decl.
732 One motivation for this is that is conventional in some
733 environments to write things like:
734 static const char rcsid[] = "... version string ...";
735 intending to force the string to be in the executable.
737 A language processor that would prefer to have unneeded
738 static constants "optimized away" would just defer writing
739 them out until here. E.g. C++ does this, because static
740 constants are often defined in header files.
742 ??? A tempting alternative (for both C and C++) would be
743 to force a constant to be written if and only if it is
744 defined in a main file, as opposed to an include file. */
746 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
748 struct varpool_node *node;
750 node = varpool_node (decl);
754 else if (node->alias)
756 else if (!cgraph_global_info_ready
758 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
760 else if (node->needed)
762 else if (DECL_COMDAT (decl))
764 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
765 && (optimize || !flag_keep_static_consts
766 || DECL_ARTIFICIAL (decl)))
771 rest_of_decl_compilation (decl, 1, 1);
779 /* Do any final processing required for the declarations in VEC, of
780 which there are LEN. We write out inline functions and variables
781 that have been deferred until this point, but which are required.
782 Returns nonzero if anything was put out. */
785 wrapup_global_declarations (tree *vec, int len)
787 bool reconsider, output_something = false;
790 for (i = 0; i < len; i++)
791 wrapup_global_declaration_1 (vec[i]);
793 /* Now emit any global variables or functions that we have been
794 putting off. We need to loop in case one of the things emitted
795 here references another one which comes earlier in the list. */
799 for (i = 0; i < len; i++)
800 reconsider |= wrapup_global_declaration_2 (vec[i]);
802 output_something = true;
806 return output_something;
809 /* A subroutine of check_global_declarations. Issue appropriate warnings
810 for the global declaration DECL. */
813 check_global_declaration_1 (tree decl)
815 /* Warn about any function declared static but not defined. We don't
816 warn about variables, because many programs have static variables
817 that exist only to get some text into the object file. */
818 if (TREE_CODE (decl) == FUNCTION_DECL
819 && DECL_INITIAL (decl) == 0
820 && DECL_EXTERNAL (decl)
821 && ! DECL_ARTIFICIAL (decl)
822 && ! TREE_NO_WARNING (decl)
823 && ! TREE_PUBLIC (decl)
824 && (warn_unused_function
825 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
827 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
828 pedwarn (0, "%q+F used but never defined", decl);
830 warning (OPT_Wunused_function, "%q+F declared %<static%> but never defined", decl);
831 /* This symbol is effectively an "extern" declaration now. */
832 TREE_PUBLIC (decl) = 1;
833 assemble_external (decl);
836 /* Warn about static fns or vars defined but not used. */
837 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
838 /* We don't warn about "static const" variables because the
839 "rcs_id" idiom uses that construction. */
840 || (warn_unused_variable
841 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
842 && ! DECL_IN_SYSTEM_HEADER (decl)
843 && ! TREE_USED (decl)
844 /* The TREE_USED bit for file-scope decls is kept in the identifier,
845 to handle multiple external decls in different scopes. */
846 && ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl)))
847 && ! DECL_EXTERNAL (decl)
848 && ! TREE_PUBLIC (decl)
849 /* A volatile variable might be used in some non-obvious way. */
850 && ! TREE_THIS_VOLATILE (decl)
851 /* Global register variables must be declared to reserve them. */
852 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
853 /* Otherwise, ask the language. */
854 && lang_hooks.decls.warn_unused_global (decl))
855 warning ((TREE_CODE (decl) == FUNCTION_DECL)
856 ? OPT_Wunused_function
857 : OPT_Wunused_variable,
858 "%q+D defined but not used", decl);
861 /* Issue appropriate warnings for the global declarations in VEC (of
862 which there are LEN). */
865 check_global_declarations (tree *vec, int len)
869 for (i = 0; i < len; i++)
870 check_global_declaration_1 (vec[i]);
873 /* Emit debugging information for all global declarations in VEC. */
876 emit_debug_global_declarations (tree *vec, int len)
880 /* Avoid confusing the debug information machinery when there are errors. */
881 if (errorcount != 0 || sorrycount != 0)
884 timevar_push (TV_SYMOUT);
885 for (i = 0; i < len; i++)
886 debug_hooks->global_decl (vec[i]);
887 timevar_pop (TV_SYMOUT);
890 /* Warn about a use of an identifier which was marked deprecated. */
892 warn_deprecated_use (tree node)
894 if (node == 0 || !warn_deprecated_decl)
899 expanded_location xloc = expand_location (DECL_SOURCE_LOCATION (node));
900 warning (OPT_Wdeprecated_declarations,
901 "%qD is deprecated (declared at %s:%d)",
902 node, xloc.file, xloc.line);
904 else if (TYPE_P (node))
906 const char *what = NULL;
907 tree decl = TYPE_STUB_DECL (node);
909 if (TYPE_NAME (node))
911 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
912 what = IDENTIFIER_POINTER (TYPE_NAME (node));
913 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
914 && DECL_NAME (TYPE_NAME (node)))
915 what = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (node)));
920 expanded_location xloc
921 = expand_location (DECL_SOURCE_LOCATION (decl));
923 warning (OPT_Wdeprecated_declarations,
924 "%qs is deprecated (declared at %s:%d)", what,
925 xloc.file, xloc.line);
927 warning (OPT_Wdeprecated_declarations,
928 "type is deprecated (declared at %s:%d)",
929 xloc.file, xloc.line);
934 warning (OPT_Wdeprecated_declarations, "%qs is deprecated", what);
936 warning (OPT_Wdeprecated_declarations, "type is deprecated");
941 /* Compile an entire translation unit. Write a file of assembly
942 output and various debugging dumps. */
947 /* Initialize yet another pass. */
949 ggc_protect_identifiers = true;
952 init_final (main_input_filename);
953 coverage_init (aux_base_name);
956 timevar_push (TV_PARSE);
958 /* Call the parser, which parses the entire file (calling
959 rest_of_compilation for each function). */
960 lang_hooks.parse_file (set_yydebug);
962 /* Compilation is now finished except for writing
963 what's left of the symbol table output. */
964 timevar_pop (TV_PARSE);
966 if (flag_syntax_only)
969 ggc_protect_identifiers = false;
971 lang_hooks.decls.final_write_globals ();
973 if (errorcount || sorrycount)
976 varpool_assemble_pending_decls ();
979 /* This must occur after the loop to output deferred functions.
980 Else the coverage initializer would not be emitted if all the
981 functions in this compilation unit were deferred. */
984 /* Likewise for mudflap static object registrations. */
986 mudflap_finish_file ();
988 /* Likewise for emulated thread-local storage. */
989 if (!targetm.have_tls)
992 output_shared_constant_pool ();
993 output_object_blocks ();
995 /* Write out any pending weak symbol declarations. */
998 /* Do dbx symbols. */
999 timevar_push (TV_SYMOUT);
1001 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
1002 if (dwarf2out_do_frame ())
1003 dwarf2out_frame_finish ();
1006 (*debug_hooks->finish) (main_input_filename);
1007 timevar_pop (TV_SYMOUT);
1009 /* Output some stuff at end of file if nec. */
1011 dw2_output_indirect_constants ();
1013 /* Flush any pending external directives. */
1014 process_pending_assemble_externals ();
1016 /* Attach a special .ident directive to the end of the file to identify
1017 the version of GCC which compiled this code. The format of the .ident
1018 string is patterned after the ones produced by native SVR4 compilers. */
1022 const char *pkg_version = "(GNU) ";
1024 if (strcmp ("(GCC) ", pkgversion_string))
1025 pkg_version = pkgversion_string;
1026 fprintf (asm_out_file, "%s\"GCC: %s%s\"\n",
1027 IDENT_ASM_OP, pkg_version, version_string);
1031 /* This must be at the end. Some target ports emit end of file directives
1032 into the assembly file here, and hence we can not output anything to the
1033 assembly file after this point. */
1034 targetm.asm_out.file_end ();
1037 /* Parse a -d... command line switch. */
1040 decode_d_option (const char *arg)
1051 flag_print_asm_name = 1;
1054 flag_dump_rtl_in_asm = 1;
1055 flag_print_asm_name = 1;
1058 graph_dump_format = vcg;
1061 rtl_dump_and_exit = 1;
1066 case 'D': /* These are handled by the preprocessor. */
1073 setup_core_dumping();
1076 enable_rtl_dump_file ();
1080 warning (0, "unrecognized gcc debugging option: %c", c);
1085 /* Indexed by enum debug_info_type. */
1086 const char *const debug_type_names[] =
1088 "none", "stabs", "coff", "dwarf-2", "xcoff", "vms"
1091 /* Print version information to FILE.
1092 Each line begins with INDENT (for the case where FILE is the
1093 assembler output file). */
1096 print_version (FILE *file, const char *indent)
1098 static const char fmt1[] =
1100 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
1102 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
1105 static const char fmt2[] =
1106 N_("GMP version %s, MPFR version %s.\n");
1107 static const char fmt3[] =
1108 N_("%s%swarning: %s header version %s differs from library version %s.\n");
1109 static const char fmt4[] =
1110 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
1112 #define __VERSION__ "[?]"
1115 file == stderr ? _(fmt1) : fmt1,
1116 indent, *indent != 0 ? " " : "",
1117 lang_hooks.name, pkgversion_string, version_string, TARGET_NAME,
1118 indent, __VERSION__);
1120 /* We need to stringify the GMP macro values. Ugh, gmp_version has
1121 two string formats, "i.j.k" and "i.j" when k is zero. */
1122 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
1123 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3(X)
1124 #if __GNU_MP_VERSION_PATCHLEVEL == 0
1125 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
1126 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR)
1128 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
1129 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) "." \
1130 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_PATCHLEVEL)
1133 file == stderr ? _(fmt2) : fmt2,
1134 GCC_GMP_STRINGIFY_VERSION, MPFR_VERSION_STRING);
1135 if (strcmp (GCC_GMP_STRINGIFY_VERSION, gmp_version))
1137 file == stderr ? _(fmt3) : fmt3,
1138 indent, *indent != 0 ? " " : "",
1139 "GMP", GCC_GMP_STRINGIFY_VERSION, gmp_version);
1140 if (strcmp (MPFR_VERSION_STRING, mpfr_get_version ()))
1142 file == stderr ? _(fmt3) : fmt3,
1143 indent, *indent != 0 ? " " : "",
1144 "MPFR", MPFR_VERSION_STRING, mpfr_get_version ());
1146 file == stderr ? _(fmt4) : fmt4,
1147 indent, *indent != 0 ? " " : "",
1148 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
1151 #ifdef ASM_COMMENT_START
1153 print_to_asm_out_file (print_switch_type type, const char * text)
1155 bool prepend_sep = true;
1159 case SWITCH_TYPE_LINE_END:
1160 putc ('\n', asm_out_file);
1163 case SWITCH_TYPE_LINE_START:
1164 fputs (ASM_COMMENT_START, asm_out_file);
1165 return strlen (ASM_COMMENT_START);
1167 case SWITCH_TYPE_DESCRIPTIVE:
1168 if (ASM_COMMENT_START[0] == 0)
1169 prepend_sep = false;
1171 case SWITCH_TYPE_PASSED:
1172 case SWITCH_TYPE_ENABLED:
1174 fputc (' ', asm_out_file);
1175 fprintf (asm_out_file, text);
1176 /* No need to return the length here as
1177 print_single_switch has already done it. */
1187 print_to_stderr (print_switch_type type, const char * text)
1191 case SWITCH_TYPE_LINE_END:
1192 putc ('\n', stderr);
1195 case SWITCH_TYPE_LINE_START:
1198 case SWITCH_TYPE_PASSED:
1199 case SWITCH_TYPE_ENABLED:
1200 fputc (' ', stderr);
1203 case SWITCH_TYPE_DESCRIPTIVE:
1204 fprintf (stderr, text);
1205 /* No need to return the length here as
1206 print_single_switch has already done it. */
1214 /* Print an option value and return the adjusted position in the line.
1215 ??? print_fn doesn't handle errors, eg disk full; presumably other
1216 code will catch a disk full though. */
1219 print_single_switch (print_switch_fn_type print_fn,
1221 print_switch_type type,
1224 /* The ultrix fprintf returns 0 on success, so compute the result
1225 we want here since we need it for the following test. The +1
1226 is for the separator character that will probably be emitted. */
1227 int len = strlen (text) + 1;
1230 && pos + len > MAX_LINE)
1232 print_fn (SWITCH_TYPE_LINE_END, NULL);
1237 pos += print_fn (SWITCH_TYPE_LINE_START, NULL);
1239 print_fn (type, text);
1243 /* Print active target switches using PRINT_FN.
1244 POS is the current cursor position and MAX is the size of a "line".
1245 Each line begins with INDENT and ends with TERM.
1246 Each switch is separated from the next by SEP. */
1249 print_switch_values (print_switch_fn_type print_fn)
1255 /* Fill in the -frandom-seed option, if the user didn't pass it, so
1256 that it can be printed below. This helps reproducibility. */
1257 if (!flag_random_seed)
1258 init_random_seed ();
1260 /* Print the options as passed. */
1261 pos = print_single_switch (print_fn, pos,
1262 SWITCH_TYPE_DESCRIPTIVE, _("options passed: "));
1264 for (p = &save_argv[1]; *p != NULL; p++)
1269 if (strcmp (*p, "-o") == 0
1270 || strcmp (*p, "-dumpbase") == 0
1271 || strcmp (*p, "-auxbase") == 0)
1278 if (strcmp (*p, "-quiet") == 0
1279 || strcmp (*p, "-version") == 0)
1286 pos = print_single_switch (print_fn, pos, SWITCH_TYPE_PASSED, *p);
1290 print_fn (SWITCH_TYPE_LINE_END, NULL);
1292 /* Print the -f and -m options that have been enabled.
1293 We don't handle language specific options but printing argv
1295 pos = print_single_switch (print_fn, 0,
1296 SWITCH_TYPE_DESCRIPTIVE, _("options enabled: "));
1298 for (j = 0; j < cl_options_count; j++)
1299 if ((cl_options[j].flags & CL_REPORT)
1300 && option_enabled (j) > 0)
1301 pos = print_single_switch (print_fn, pos,
1302 SWITCH_TYPE_ENABLED, cl_options[j].opt_text);
1304 print_fn (SWITCH_TYPE_LINE_END, NULL);
1307 /* Open assembly code output file. Do this even if -fsyntax-only is
1308 on, because then the driver will have provided the name of a
1309 temporary file or bit bucket for us. NAME is the file specified on
1310 the command line, possibly NULL. */
1312 init_asm_output (const char *name)
1314 if (name == NULL && asm_file_name == 0)
1315 asm_out_file = stdout;
1318 if (asm_file_name == 0)
1320 int len = strlen (dump_base_name);
1321 char *dumpname = XNEWVEC (char, len + 6);
1323 memcpy (dumpname, dump_base_name, len + 1);
1324 strip_off_ending (dumpname, len);
1325 strcat (dumpname, ".s");
1326 asm_file_name = dumpname;
1328 if (!strcmp (asm_file_name, "-"))
1329 asm_out_file = stdout;
1331 asm_out_file = fopen (asm_file_name, "w+b");
1332 if (asm_out_file == 0)
1333 fatal_error ("can%'t open %s for writing: %m", asm_file_name);
1336 if (!flag_syntax_only)
1338 targetm.asm_out.file_start ();
1340 if (flag_record_gcc_switches)
1342 if (targetm.asm_out.record_gcc_switches)
1344 /* Let the target know that we are about to start recording. */
1345 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
1347 /* Now record the switches. */
1348 print_switch_values (targetm.asm_out.record_gcc_switches);
1349 /* Let the target know that the recording is over. */
1350 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
1354 inform ("-frecord-gcc-switches is not supported by the current target");
1357 #ifdef ASM_COMMENT_START
1358 if (flag_verbose_asm)
1360 /* Print the list of switches in effect
1361 into the assembler file as comments. */
1362 print_version (asm_out_file, ASM_COMMENT_START);
1363 print_switch_values (print_to_asm_out_file);
1364 fprintf (asm_out_file, "\n");
1370 /* Return true if the state of option OPTION should be stored in PCH files
1371 and checked by default_pch_valid_p. Store the option's current state
1375 option_affects_pch_p (int option, struct cl_option_state *state)
1377 if ((cl_options[option].flags & CL_TARGET) == 0)
1379 if (cl_options[option].flag_var == &target_flags)
1380 if (targetm.check_pch_target_flags)
1382 return get_option_state (option, state);
1385 /* Default version of get_pch_validity.
1386 By default, every flag difference is fatal; that will be mostly right for
1387 most targets, but completely right for very few. */
1390 default_get_pch_validity (size_t *len)
1392 struct cl_option_state state;
1397 if (targetm.check_pch_target_flags)
1398 *len += sizeof (target_flags);
1399 for (i = 0; i < cl_options_count; i++)
1400 if (option_affects_pch_p (i, &state))
1403 result = r = XNEWVEC (char, *len);
1407 if (targetm.check_pch_target_flags)
1409 memcpy (r, &target_flags, sizeof (target_flags));
1410 r += sizeof (target_flags);
1413 for (i = 0; i < cl_options_count; i++)
1414 if (option_affects_pch_p (i, &state))
1416 memcpy (r, state.data, state.size);
1423 /* Return a message which says that a PCH file was created with a different
1424 setting of OPTION. */
1427 pch_option_mismatch (const char *option)
1431 asprintf (&r, _("created and used with differing settings of '%s'"), option);
1433 return _("out of memory");
1437 /* Default version of pch_valid_p. */
1440 default_pch_valid_p (const void *data_p, size_t len)
1442 struct cl_option_state state;
1443 const char *data = (const char *)data_p;
1446 /* -fpic and -fpie also usually make a PCH invalid. */
1447 if (data[0] != flag_pic)
1448 return _("created and used with different settings of -fpic");
1449 if (data[1] != flag_pie)
1450 return _("created and used with different settings of -fpie");
1453 /* Check target_flags. */
1454 if (targetm.check_pch_target_flags)
1459 memcpy (&tf, data, sizeof (target_flags));
1460 data += sizeof (target_flags);
1461 len -= sizeof (target_flags);
1462 r = targetm.check_pch_target_flags (tf);
1467 for (i = 0; i < cl_options_count; i++)
1468 if (option_affects_pch_p (i, &state))
1470 if (memcmp (data, state.data, state.size) != 0)
1471 return pch_option_mismatch (cl_options[i].opt_text);
1479 /* Default tree printer. Handles declarations only. */
1481 default_tree_printer (pretty_printer * pp, text_info *text, const char *spec,
1482 int precision, bool wide, bool set_locus, bool hash)
1486 /* FUTURE: %+x should set the locus. */
1487 if (precision != 0 || wide || hash)
1493 t = va_arg (*text->args_ptr, tree);
1494 if (DECL_DEBUG_EXPR_IS_FROM (t) && DECL_DEBUG_EXPR (t))
1495 t = DECL_DEBUG_EXPR (t);
1500 t = va_arg (*text->args_ptr, tree);
1507 if (set_locus && text->locus)
1508 *text->locus = DECL_SOURCE_LOCATION (t);
1512 const char *n = DECL_NAME (t)
1513 ? lang_hooks.decl_printable_name (t, 2)
1518 dump_generic_node (pp, t, 0, TDF_DIAGNOSTIC, 0);
1523 /* A helper function; used as the reallocator function for cpp's line
1526 realloc_for_line_map (void *ptr, size_t len)
1528 return ggc_realloc (ptr, len);
1531 /* Initialization of the front end environment, before command line
1532 options are parsed. Signal handlers, internationalization etc.
1533 ARGV0 is main's argv[0]. */
1535 general_init (const char *argv0)
1539 p = argv0 + strlen (argv0);
1540 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1544 xmalloc_set_program_name (progname);
1548 /* Unlock the stdio streams. */
1549 unlock_std_streams ();
1551 gcc_init_libintl ();
1553 /* Initialize the diagnostics reporting machinery, so option parsing
1554 can give warnings and errors. */
1555 diagnostic_initialize (global_dc);
1556 /* Set a default printer. Language specific initializations will
1557 override it later. */
1558 pp_format_decoder (global_dc->printer) = &default_tree_printer;
1560 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1562 signal (SIGSEGV, crash_signal);
1565 signal (SIGILL, crash_signal);
1568 signal (SIGBUS, crash_signal);
1571 signal (SIGABRT, crash_signal);
1573 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1574 signal (SIGIOT, crash_signal);
1577 signal (SIGFPE, crash_signal);
1580 /* Other host-specific signal setup. */
1581 (*host_hooks.extra_signals)();
1583 /* Initialize the garbage-collector, string pools and tree type hash
1587 line_table = GGC_NEW (struct line_maps);
1588 linemap_init (line_table);
1589 line_table->reallocator = realloc_for_line_map;
1592 /* Initialize register usage now so switches may override. */
1595 /* Register the language-independent parameters. */
1596 add_params (lang_independent_params, LAST_PARAM);
1598 /* This must be done after add_params but before argument processing. */
1599 init_ggc_heuristics();
1600 init_optimization_passes ();
1601 statistics_early_init ();
1604 /* Return true if the current target supports -fsection-anchors. */
1607 target_supports_section_anchors_p (void)
1609 if (targetm.min_anchor_offset == 0 && targetm.max_anchor_offset == 0)
1612 if (targetm.asm_out.output_anchor == NULL)
1618 /* Default the align_* variables to 1 if they're still unset, and
1619 set up the align_*_log variables. */
1621 init_alignments (void)
1623 if (align_loops <= 0)
1625 if (align_loops_max_skip > align_loops)
1626 align_loops_max_skip = align_loops - 1;
1627 align_loops_log = floor_log2 (align_loops * 2 - 1);
1628 if (align_jumps <= 0)
1630 if (align_jumps_max_skip > align_jumps)
1631 align_jumps_max_skip = align_jumps - 1;
1632 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1633 if (align_labels <= 0)
1635 align_labels_log = floor_log2 (align_labels * 2 - 1);
1636 if (align_labels_max_skip > align_labels)
1637 align_labels_max_skip = align_labels - 1;
1638 if (align_functions <= 0)
1639 align_functions = 1;
1640 align_functions_log = floor_log2 (align_functions * 2 - 1);
1643 /* Process the options that have been parsed. */
1645 process_options (void)
1647 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1648 This can happen with incorrect pre-processed input. */
1649 debug_hooks = &do_nothing_debug_hooks;
1651 /* Allow the front end to perform consistency checks and do further
1652 initialization based on the command line options. This hook also
1653 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1654 so we can correctly initialize debug output. */
1655 no_backend = lang_hooks.post_options (&main_input_filename);
1657 #ifdef OVERRIDE_OPTIONS
1658 /* Some machines may reject certain combinations of options. */
1662 if (flag_section_anchors && !target_supports_section_anchors_p ())
1664 warning (OPT_fsection_anchors,
1665 "this target does not support %qs", "-fsection-anchors");
1666 flag_section_anchors = 0;
1669 if (flag_short_enums == 2)
1670 flag_short_enums = targetm.default_short_enums ();
1672 /* Set aux_base_name if not already set. */
1675 else if (main_input_filename)
1677 char *name = xstrdup (lbasename (main_input_filename));
1679 strip_off_ending (name, strlen (name));
1680 aux_base_name = name;
1683 aux_base_name = "gccaux";
1685 /* Unrolling all loops implies that standard loop unrolling must also
1687 if (flag_unroll_all_loops)
1688 flag_unroll_loops = 1;
1690 /* The loop unrolling code assumes that cse will be run after loop.
1691 web and rename-registers also help when run after loop unrolling. */
1693 if (flag_rerun_cse_after_loop == AUTODETECT_VALUE)
1694 flag_rerun_cse_after_loop = flag_unroll_loops || flag_peel_loops;
1695 if (flag_web == AUTODETECT_VALUE)
1696 flag_web = flag_unroll_loops || flag_peel_loops;
1697 if (flag_rename_registers == AUTODETECT_VALUE)
1698 flag_rename_registers = flag_unroll_loops || flag_peel_loops;
1700 if (flag_non_call_exceptions)
1701 flag_asynchronous_unwind_tables = 1;
1702 if (flag_asynchronous_unwind_tables)
1703 flag_unwind_tables = 1;
1705 if (flag_value_profile_transformations)
1706 flag_profile_values = 1;
1708 /* Warn about options that are not supported on this machine. */
1709 #ifndef INSN_SCHEDULING
1710 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1711 warning (0, "instruction scheduling not supported on this target machine");
1714 if (flag_delayed_branch)
1715 warning (0, "this target machine does not have delayed branches");
1718 user_label_prefix = USER_LABEL_PREFIX;
1719 if (flag_leading_underscore != -1)
1721 /* If the default prefix is more complicated than "" or "_",
1722 issue a warning and ignore this option. */
1723 if (user_label_prefix[0] == 0 ||
1724 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1726 user_label_prefix = flag_leading_underscore ? "_" : "";
1729 warning (0, "-f%sleading-underscore not supported on this target machine",
1730 flag_leading_underscore ? "" : "no-");
1733 /* If we are in verbose mode, write out the version and maybe all the
1734 option flags in use. */
1737 print_version (stderr, "");
1739 print_switch_values (print_to_stderr);
1742 if (flag_syntax_only)
1744 write_symbols = NO_DEBUG;
1748 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1750 if (debug_info_level == DINFO_LEVEL_NONE)
1751 write_symbols = NO_DEBUG;
1753 /* Now we know write_symbols, set up the debug hooks based on it.
1754 By default we do nothing for debug output. */
1755 if (PREFERRED_DEBUGGING_TYPE == NO_DEBUG)
1756 default_debug_hooks = &do_nothing_debug_hooks;
1757 #if defined(DBX_DEBUGGING_INFO)
1758 else if (PREFERRED_DEBUGGING_TYPE == DBX_DEBUG)
1759 default_debug_hooks = &dbx_debug_hooks;
1761 #if defined(XCOFF_DEBUGGING_INFO)
1762 else if (PREFERRED_DEBUGGING_TYPE == XCOFF_DEBUG)
1763 default_debug_hooks = &xcoff_debug_hooks;
1765 #ifdef SDB_DEBUGGING_INFO
1766 else if (PREFERRED_DEBUGGING_TYPE == SDB_DEBUG)
1767 default_debug_hooks = &sdb_debug_hooks;
1769 #ifdef DWARF2_DEBUGGING_INFO
1770 else if (PREFERRED_DEBUGGING_TYPE == DWARF2_DEBUG)
1771 default_debug_hooks = &dwarf2_debug_hooks;
1773 #ifdef VMS_DEBUGGING_INFO
1774 else if (PREFERRED_DEBUGGING_TYPE == VMS_DEBUG
1775 || PREFERRED_DEBUGGING_TYPE == VMS_AND_DWARF2_DEBUG)
1776 default_debug_hooks = &vmsdbg_debug_hooks;
1779 if (write_symbols == NO_DEBUG)
1781 #if defined(DBX_DEBUGGING_INFO)
1782 else if (write_symbols == DBX_DEBUG)
1783 debug_hooks = &dbx_debug_hooks;
1785 #if defined(XCOFF_DEBUGGING_INFO)
1786 else if (write_symbols == XCOFF_DEBUG)
1787 debug_hooks = &xcoff_debug_hooks;
1789 #ifdef SDB_DEBUGGING_INFO
1790 else if (write_symbols == SDB_DEBUG)
1791 debug_hooks = &sdb_debug_hooks;
1793 #ifdef DWARF2_DEBUGGING_INFO
1794 else if (write_symbols == DWARF2_DEBUG)
1795 debug_hooks = &dwarf2_debug_hooks;
1797 #ifdef VMS_DEBUGGING_INFO
1798 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1799 debug_hooks = &vmsdbg_debug_hooks;
1802 error ("target system does not support the \"%s\" debug format",
1803 debug_type_names[write_symbols]);
1805 /* Now we know which debug output will be used so we can set
1806 flag_var_tracking, flag_rename_registers if the user has
1807 not specified them. */
1808 if (debug_info_level < DINFO_LEVEL_NORMAL
1809 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
1811 if (flag_var_tracking == 1
1812 || flag_var_tracking_uninit == 1)
1814 if (debug_info_level < DINFO_LEVEL_NORMAL)
1815 warning (0, "variable tracking requested, but useless unless "
1816 "producing debug info");
1818 warning (0, "variable tracking requested, but not supported "
1819 "by this debug format");
1821 flag_var_tracking = 0;
1822 flag_var_tracking_uninit = 0;
1825 if (flag_rename_registers == AUTODETECT_VALUE)
1826 flag_rename_registers = default_debug_hooks->var_location
1827 != do_nothing_debug_hooks.var_location;
1829 if (flag_var_tracking == AUTODETECT_VALUE)
1830 flag_var_tracking = optimize >= 1;
1832 if (flag_tree_cselim == AUTODETECT_VALUE)
1833 #ifdef HAVE_conditional_move
1834 flag_tree_cselim = 1;
1836 flag_tree_cselim = 0;
1839 /* If the user specifically requested variable tracking with tagging
1840 uninitialized variables, we need to turn on variable tracking.
1841 (We already determined above that variable tracking is feasible.) */
1842 if (flag_var_tracking_uninit)
1843 flag_var_tracking = 1;
1845 /* If auxiliary info generation is desired, open the output file.
1846 This goes in the same directory as the source file--unlike
1847 all the other output files. */
1848 if (flag_gen_aux_info)
1850 aux_info_file = fopen (aux_info_file_name, "w");
1851 if (aux_info_file == 0)
1852 fatal_error ("can%'t open %s: %m", aux_info_file_name);
1855 if (! targetm.have_named_sections)
1857 if (flag_function_sections)
1859 warning (0, "-ffunction-sections not supported for this target");
1860 flag_function_sections = 0;
1862 if (flag_data_sections)
1864 warning (0, "-fdata-sections not supported for this target");
1865 flag_data_sections = 0;
1869 if (flag_function_sections && profile_flag)
1871 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
1872 flag_function_sections = 0;
1875 #ifndef HAVE_prefetch
1876 if (flag_prefetch_loop_arrays)
1878 warning (0, "-fprefetch-loop-arrays not supported for this target");
1879 flag_prefetch_loop_arrays = 0;
1882 if (flag_prefetch_loop_arrays && !HAVE_prefetch)
1884 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1885 flag_prefetch_loop_arrays = 0;
1889 /* This combination of options isn't handled for i386 targets and doesn't
1890 make much sense anyway, so don't allow it. */
1891 if (flag_prefetch_loop_arrays && optimize_size)
1893 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1894 flag_prefetch_loop_arrays = 0;
1897 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1898 if (flag_signaling_nans)
1899 flag_trapping_math = 1;
1901 /* We cannot reassociate if we want traps or signed zeros. Â */
1902 if (flag_associative_math && (flag_trapping_math || flag_signed_zeros))
1904 warning (0, "-fassociative-math disabled; other options take precedence");
1905 flag_associative_math = 0;
1908 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
1909 if (flag_cx_limited_range)
1910 flag_complex_method = 0;
1912 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
1913 if (flag_cx_fortran_rules)
1914 flag_complex_method = 1;
1916 /* Targets must be able to place spill slots at lower addresses. If the
1917 target already uses a soft frame pointer, the transition is trivial. */
1918 if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
1920 warning (0, "-fstack-protector not supported for this target");
1921 flag_stack_protect = 0;
1923 if (!flag_stack_protect)
1924 warn_stack_protect = 0;
1926 /* ??? Unwind info is not correct around the CFG unless either a frame
1927 pointer is present or A_O_A is set. Fixing this requires rewriting
1928 unwind info generation to be aware of the CFG and propagating states
1930 if (flag_unwind_tables && !ACCUMULATE_OUTGOING_ARGS
1931 && flag_omit_frame_pointer)
1933 warning (0, "unwind tables currently require a frame pointer "
1935 flag_omit_frame_pointer = 0;
1939 /* This function can be called multiple times to reinitialize the compiler
1940 back end when register classes or instruction sets have changed,
1941 before each function. */
1943 backend_init_target (void)
1945 /* Initialize alignment variables. */
1948 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
1949 to initialize reg_raw_mode[]. */
1952 /* This invokes target hooks to set fixed_reg[] etc, which is
1956 /* This depends on stack_pointer_rtx. */
1957 init_fake_stack_mems ();
1959 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
1961 init_alias_target ();
1963 /* Depends on HARD_FRAME_POINTER_REGNUM. */
1966 /* The following initialization functions need to generate rtl, so
1967 provide a dummy function context for them. */
1968 init_dummy_function_start ();
1970 /* rtx_cost is mode-dependent, so cached values need to be recomputed
1971 on a mode change. */
1974 /* We may need to recompute regno_save_code[] and regno_restore_code[]
1975 after a mode change as well. */
1976 if (flag_caller_saves)
1977 init_caller_save ();
1978 expand_dummy_function_end ();
1981 /* Initialize the compiler back end. This function is called only once,
1982 when starting the compiler. */
1986 init_emit_once (debug_info_level == DINFO_LEVEL_NORMAL
1987 || debug_info_level == DINFO_LEVEL_VERBOSE
1988 #ifdef VMS_DEBUGGING_INFO
1989 /* Enable line number info for traceback. */
1990 || debug_info_level > DINFO_LEVEL_NONE
1992 || flag_test_coverage);
1995 init_inline_once ();
1996 init_varasm_once ();
1997 save_register_info ();
1999 /* Initialize the target-specific back end pieces. */
2000 backend_init_target ();
2003 /* Initialize things that are both lang-dependent and target-dependent.
2004 This function can be called more than once if target parameters change. */
2006 lang_dependent_init_target (void)
2008 /* This creates various _DECL nodes, so needs to be called after the
2009 front end is initialized. It also depends on the HAVE_xxx macros
2010 generated from the target machine description. */
2013 /* The following initialization functions need to generate rtl, so
2014 provide a dummy function context for them. */
2015 init_dummy_function_start ();
2017 /* Do the target-specific parts of expr initialization. */
2018 init_expr_target ();
2020 /* Although the actions of init_set_costs are language-independent,
2021 it uses optabs, so we cannot call it from backend_init. */
2024 expand_dummy_function_end ();
2027 /* Language-dependent initialization. Returns nonzero on success. */
2029 lang_dependent_init (const char *name)
2031 location_t save_loc = input_location;
2032 if (dump_base_name == 0)
2033 dump_base_name = name && name[0] ? name : "gccdump";
2035 /* Other front-end initialization. */
2036 input_location = BUILTINS_LOCATION;
2037 if (lang_hooks.init () == 0)
2039 input_location = save_loc;
2041 init_asm_output (name);
2043 /* This creates various _DECL nodes, so needs to be called after the
2044 front end is initialized. */
2047 /* Do the target-specific parts of the initialization. */
2048 lang_dependent_init_target ();
2050 /* If dbx symbol table desired, initialize writing it and output the
2051 predefined types. */
2052 timevar_push (TV_SYMOUT);
2054 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
2055 if (dwarf2out_do_frame ())
2056 dwarf2out_frame_init ();
2059 /* Now we have the correct original filename, we can initialize
2061 (*debug_hooks->init) (name);
2063 timevar_pop (TV_SYMOUT);
2069 /* Reinitialize everything when target parameters, such as register usage,
2072 target_reinit (void)
2074 /* Reinitialize RTL backend. */
2075 backend_init_target ();
2077 /* Reinitialize lang-dependent parts. */
2078 lang_dependent_init_target ();
2082 dump_memory_report (bool final)
2084 ggc_print_statistics ();
2085 stringpool_statistics ();
2086 dump_tree_statistics ();
2087 dump_rtx_statistics ();
2088 dump_varray_statistics ();
2089 dump_alloc_pool_statistics ();
2090 dump_bitmap_statistics ();
2091 dump_ggc_loc_statistics (final);
2094 /* Clean up: close opened files, etc. */
2099 /* Close the dump files. */
2100 if (flag_gen_aux_info)
2102 fclose (aux_info_file);
2104 unlink (aux_info_file_name);
2107 /* Close non-debugging input and output files. Take special care to note
2108 whether fclose returns an error, since the pages might still be on the
2109 buffer chain while the file is open. */
2113 if (ferror (asm_out_file) != 0)
2114 fatal_error ("error writing to %s: %m", asm_file_name);
2115 if (fclose (asm_out_file) != 0)
2116 fatal_error ("error closing %s: %m", asm_file_name);
2120 finish_optimization_passes ();
2123 dump_memory_report (true);
2125 /* Language-specific end of compilation actions. */
2126 lang_hooks.finish ();
2129 /* Initialize the compiler, and compile the input file. */
2133 /* Initialize timing first. The C front ends read the main file in
2134 the post_options hook, and C++ does file timings. */
2135 if (time_report || !quiet_flag || flag_detailed_statistics)
2137 timevar_start (TV_TOTAL);
2141 /* Don't do any more if an error has already occurred. */
2144 /* This must be run always, because it is needed to compute the FP
2145 predefined macros, such as __LDBL_MAX__, for targets using non
2146 default FP formats. */
2147 init_adjust_machine_modes ();
2149 /* Set up the back-end if requested. */
2153 /* Language-dependent initialization. Returns true on success. */
2154 if (lang_dependent_init (main_input_filename))
2160 /* Stop timing and print the times. */
2161 timevar_stop (TV_TOTAL);
2162 timevar_print (stderr);
2165 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2166 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2167 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2169 It is not safe to call this function more than once. */
2172 toplev_main (unsigned int argc, const char **argv)
2176 /* Initialization of GCC's environment, and diagnostics. */
2177 general_init (argv[0]);
2179 /* Parse the options and do minimal processing; basically just
2180 enough to default flags appropriately. */
2181 decode_options (argc, argv);
2185 /* Exit early if we can (e.g. -help). */
2186 if (!exit_after_options)
2189 if (warningcount || errorcount)
2190 print_ignored_options ();
2192 if (errorcount || sorrycount)
2193 return (FATAL_EXIT_CODE);
2195 return (SUCCESS_EXIT_CODE);