1 /* Top level of GCC compilers (cc1, cc1plus, etc.)
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
29 #include "coretypes.h"
33 #ifdef HAVE_SYS_RESOURCE_H
34 # include <sys/resource.h>
37 #ifdef HAVE_SYS_TIMES_H
38 # include <sys/times.h>
44 #include "realmpfr.h" /* For GMP/MPFR/MPC versions, in print_version. */
49 #include "insn-attr.h"
50 #include "insn-config.h"
51 #include "insn-flags.h"
52 #include "hard-reg-set.h"
59 #include "basic-block.h"
65 #include "diagnostic.h"
66 #include "tree-diagnostic.h"
67 #include "tree-pretty-print.h"
71 #include "dwarf2asm.h"
72 #include "integrate.h"
75 #include "langhooks.h"
76 #include "cfglayout.h"
78 #include "hosthooks.h"
81 #include "opts-diagnostic.h"
83 #include "value-prof.h"
84 #include "alloc-pool.h"
85 #include "tree-mudflap.h"
86 #include "tree-pass.h"
88 #include "tree-ssa-alias.h"
91 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
92 #include "dwarf2out.h"
95 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
99 #ifdef SDB_DEBUGGING_INFO
103 #ifdef XCOFF_DEBUGGING_INFO
104 #include "xcoffout.h" /* Needed for external data
105 declarations for e.g. AIX 4.x. */
108 static void general_init (const char *);
109 static void do_compile (void);
110 static void process_options (void);
111 static void backend_init (void);
112 static int lang_dependent_init (const char *);
113 static void init_asm_output (const char *);
114 static void finalize (void);
116 static void crash_signal (int) ATTRIBUTE_NORETURN;
117 static void setup_core_dumping (void);
118 static void compile_file (void);
120 /* Nonzero to dump debug info whilst parsing (-dy option). */
121 static int set_yydebug;
123 /* True if we don't need a backend (e.g. preprocessing only). */
124 static bool no_backend;
126 /* Length of line when printing switch values. */
129 /* Decoded options, and number of such options. */
130 static struct cl_decoded_option *save_decoded_options;
131 static unsigned int save_decoded_options_count;
133 /* Name of top-level original source file (what was input to cpp).
134 This comes from the #-command at the beginning of the actual input.
135 If there isn't any there, then this is the cc1 input file name. */
137 const char *main_input_filename;
139 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
140 to optimize in process_options (). */
141 #define AUTODETECT_VALUE 2
143 /* Name to use as base of names for dump output files. */
145 const char *dump_base_name;
147 /* Directory used for dump output files. */
149 const char *dump_dir_name;
151 /* Name to use as a base for auxiliary output files. */
153 const char *aux_base_name;
155 /* Prefix for profile data files */
156 const char *profile_data_prefix;
158 /* A mask of target_flags that includes bit X if X was set or cleared
159 on the command line. */
161 int target_flags_explicit;
163 /* Debug hooks - dependent upon command line options. */
165 const struct gcc_debug_hooks *debug_hooks;
167 /* Other flags saying which kinds of debugging dump have been requested. */
169 int rtl_dump_and_exit;
170 int flag_print_asm_name;
171 enum graph_dump_types graph_dump_format;
173 /* Name for output file of assembly code, specified with -o. */
175 const char *asm_file_name;
177 /* Nonzero means do optimizations. -O.
178 Particular numeric values stand for particular amounts of optimization;
179 thus, -O2 stores 2 here. However, the optimizations beyond the basic
180 ones are not controlled directly by this variable. Instead, they are
181 controlled by individual `flag_...' variables that are defaulted
182 based on this variable. */
186 /* Nonzero means optimize for size. -Os.
187 The only valid values are zero and nonzero. When optimize_size is
188 nonzero, optimize defaults to 2, but certain individual code
189 bloating optimizations are disabled. */
191 int optimize_size = 0;
193 /* True if this is the lto front end. This is used to disable
194 gimple generation and lowering passes that are normally run on the
195 output of a front end. These passes must be bypassed for lto since
196 they have already been done before the gimple was written. */
198 bool in_lto_p = false;
200 /* Nonzero if we should write GIMPLE bytecode for link-time optimization. */
202 int flag_generate_lto;
204 /* The FUNCTION_DECL for the function currently being compiled,
205 or 0 if between functions. */
206 tree current_function_decl;
208 /* Set to the FUNC_BEGIN label of the current function, or NULL
210 const char * current_function_func_begin_label;
212 /* A random sequence of characters, unless overridden by user. */
213 static const char *flag_random_seed;
215 /* A local time stamp derived from the time of compilation. It will be
216 zero if the system cannot provide a time. It will be -1u, if the
217 user has specified a particular random seed. */
222 /* 0 means straightforward implementation of complex divide acceptable.
223 1 means wide ranges of inputs must work for complex divide.
224 2 means C99-like requirements for complex multiply and divide. */
226 int flag_complex_method = 1;
228 /* Nonzero means we should be saving declaration info into a .X file. */
230 int flag_gen_aux_info = 0;
232 /* Specified name of aux-info file. */
234 const char *aux_info_file_name;
236 /* Nonzero if we are compiling code for a shared library, zero for
241 /* Generate code for GNU or NeXT Objective-C runtime environment. */
243 #ifdef NEXT_OBJC_RUNTIME
244 int flag_next_runtime = 1;
246 int flag_next_runtime = 0;
249 /* Set to the default thread-local storage (tls) model to use. */
251 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
253 /* Set the default region and algorithm for the integrated register
256 enum ira_algorithm flag_ira_algorithm = IRA_ALGORITHM_CB;
257 enum ira_region flag_ira_region = IRA_REGION_MIXED;
259 /* Set the default for excess precision. */
261 enum excess_precision flag_excess_precision_cmdline = EXCESS_PRECISION_DEFAULT;
263 /* Nonzero means change certain warnings into errors.
264 Usually these are warnings about failure to conform to some standard. */
266 int flag_pedantic_errors = 0;
268 /* Nonzero means make permerror produce warnings instead of errors. */
270 int flag_permissive = 0;
272 /* -dA causes debug commentary information to be produced in
273 the generated assembly code (to make it more readable). This option
274 is generally only of use to those who actually need to read the
275 generated assembly code (perhaps while debugging the compiler itself).
276 Currently, this switch is only used by dwarfout.c; however, it is intended
277 to be a catchall for printing debug information in the assembler file. */
279 int flag_debug_asm = 0;
281 /* -dP causes the rtl to be emitted as a comment in assembly. */
283 int flag_dump_rtl_in_asm = 0;
285 /* When non-NULL, indicates that whenever space is allocated on the
286 stack, the resulting stack pointer must not pass this
287 address---that is, for stacks that grow downward, the stack pointer
288 must always be greater than or equal to this address; for stacks
289 that grow upward, the stack pointer must be less than this address.
290 At present, the rtx may be either a REG or a SYMBOL_REF, although
291 the support provided depends on the backend. */
294 /* Type of stack check. */
295 enum stack_check_type flag_stack_check = NO_STACK_CHECK;
297 /* True if the user has tagged the function with the 'section'
300 bool user_defined_section_attribute = false;
302 struct target_flag_state default_target_flag_state;
303 #if SWITCHABLE_TARGET
304 struct target_flag_state *this_target_flag_state = &default_target_flag_state;
306 #define this_target_flag_state (&default_target_flag_state)
311 const char *const string;
315 lang_independent_options;
317 /* Nonzero if subexpressions must be evaluated from left-to-right. */
318 int flag_evaluation_order = 0;
320 /* The user symbol prefix after having resolved same. */
321 const char *user_label_prefix;
323 static const param_info lang_independent_params[] = {
324 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
325 { OPTION, DEFAULT, false, MIN, MAX, HELP },
326 #include "params.def"
328 { NULL, 0, false, 0, 0, NULL }
331 /* Output files for assembler code (real compiler output)
332 and debugging dumps. */
336 FILE *stack_usage_file = NULL;
337 FILE *dump_file = NULL;
338 const char *dump_file_name;
340 /* The current working directory of a translation. It's generally the
341 directory from which compilation was initiated, but a preprocessed
342 file may specify the original directory in which it was
345 static const char *src_pwd;
347 /* Initialize src_pwd with the given string, and return true. If it
348 was already initialized, return false. As a special case, it may
349 be called with a NULL argument to test whether src_pwd has NOT been
353 set_src_pwd (const char *pwd)
357 if (strcmp (src_pwd, pwd) == 0)
363 src_pwd = xstrdup (pwd);
367 /* Return the directory from which the translation unit was initiated,
368 in case set_src_pwd() was not called before to assign it a
384 /* Called when the start of a function definition is parsed,
385 this function prints on stderr the name of the function. */
387 announce_function (tree decl)
391 if (rtl_dump_and_exit)
392 fprintf (stderr, "%s ",
393 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl))));
395 fprintf (stderr, " %s",
396 identifier_to_locale (lang_hooks.decl_printable_name (decl, 2)));
398 pp_needs_newline (global_dc->printer) = true;
399 diagnostic_set_last_function (global_dc, (diagnostic_info *) NULL);
403 /* Initialize local_tick with the time of day, or -1 if
404 flag_random_seed is set. */
407 init_local_tick (void)
409 if (!flag_random_seed)
411 /* Get some more or less random data. */
412 #ifdef HAVE_GETTIMEOFDAY
416 gettimeofday (&tv, NULL);
417 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
421 time_t now = time (NULL);
423 if (now != (time_t)-1)
424 local_tick = (unsigned) now;
432 /* Set up a default flag_random_seed and local_tick, unless the user
433 already specified one. Must be called after init_local_tick. */
436 init_random_seed (void)
438 unsigned HOST_WIDE_INT value;
439 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
441 value = local_tick ^ getpid ();
443 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
444 flag_random_seed = random_seed;
447 /* Obtain the random_seed string. Unless NOINIT, initialize it if
448 it's not provided in the command line. */
451 get_random_seed (bool noinit)
453 if (!flag_random_seed && !noinit)
455 return flag_random_seed;
458 /* Modify the random_seed string to VAL. Return its previous
462 set_random_seed (const char *val)
464 const char *old = flag_random_seed;
465 flag_random_seed = val;
469 #if GCC_VERSION < 3004
471 /* The functions clz_hwi, ctz_hwi, ffs_hwi, floor_log2 and exact_log2
472 are defined as inline functions in toplev.h if GCC_VERSION >= 3004.
473 The definitions here are used for older versions of gcc. */
475 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
476 If X is 0, return -1. */
479 floor_log2 (unsigned HOST_WIDE_INT x)
486 if (HOST_BITS_PER_WIDE_INT > 64)
487 if (x >= (unsigned HOST_WIDE_INT) 1 << (t + 64))
489 if (HOST_BITS_PER_WIDE_INT > 32)
490 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 32))
492 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 16))
494 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 8))
496 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 4))
498 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 2))
500 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 1))
506 /* Return the logarithm of X, base 2, considering X unsigned,
507 if X is a power of 2. Otherwise, returns -1. */
510 exact_log2 (unsigned HOST_WIDE_INT x)
514 return floor_log2 (x);
517 /* Given X, an unsigned number, return the number of least significant bits
518 that are zero. When X == 0, the result is the word size. */
521 ctz_hwi (unsigned HOST_WIDE_INT x)
523 return x ? floor_log2 (x & -x) : HOST_BITS_PER_WIDE_INT;
526 /* Similarly for most significant bits. */
529 clz_hwi (unsigned HOST_WIDE_INT x)
531 return HOST_BITS_PER_WIDE_INT - 1 - floor_log2(x);
534 /* Similar to ctz_hwi, except that the least significant bit is numbered
535 starting from 1, and X == 0 yields 0. */
538 ffs_hwi (unsigned HOST_WIDE_INT x)
540 return 1 + floor_log2 (x & -x);
543 #endif /* GCC_VERSION < 3004 */
545 /* Handler for fatal signals, such as SIGSEGV. These are transformed
546 into ICE messages, which is much more user friendly. In case the
547 error printer crashes, reset the signal to prevent infinite recursion. */
550 crash_signal (int signo)
552 signal (signo, SIG_DFL);
554 /* If we crashed while processing an ASM statement, then be a little more
555 graceful. It's most likely the user's fault. */
556 if (this_is_asm_operands)
558 output_operand_lossage ("unrecoverable error");
559 exit (FATAL_EXIT_CODE);
562 internal_error ("%s", strsignal (signo));
565 /* Arrange to dump core on error. (The regular error message is still
566 printed first, except in the case of abort().) */
569 setup_core_dumping (void)
572 signal (SIGABRT, SIG_DFL);
574 #if defined(HAVE_SETRLIMIT)
577 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
578 fatal_error ("getting core file size maximum limit: %m");
579 rlim.rlim_cur = rlim.rlim_max;
580 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
581 fatal_error ("setting core file size limit to maximum: %m");
584 diagnostic_abort_on_error (global_dc);
588 /* Strip off a legitimate source ending from the input string NAME of
589 length LEN. Rather than having to know the names used by all of
590 our front ends, we strip off an ending of a period followed by
591 up to five characters. (Java uses ".class".) */
594 strip_off_ending (char *name, int len)
597 for (i = 2; i < 6 && len > i; i++)
599 if (name[len - i] == '.')
601 name[len - i] = '\0';
607 /* Output a quoted string. */
610 output_quoted_string (FILE *asm_file, const char *string)
612 #ifdef OUTPUT_QUOTED_STRING
613 OUTPUT_QUOTED_STRING (asm_file, string);
617 putc ('\"', asm_file);
618 while ((c = *string++) != 0)
622 if (c == '\"' || c == '\\')
623 putc ('\\', asm_file);
627 fprintf (asm_file, "\\%03o", (unsigned char) c);
629 putc ('\"', asm_file);
633 /* A subroutine of wrapup_global_declarations. We've come to the end of
634 the compilation unit. All deferred variables should be undeferred,
635 and all incomplete decls should be finalized. */
638 wrapup_global_declaration_1 (tree decl)
640 /* We're not deferring this any longer. Assignment is conditional to
641 avoid needlessly dirtying PCH pages. */
642 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl), TS_DECL_WITH_VIS)
643 && DECL_DEFER_OUTPUT (decl) != 0)
644 DECL_DEFER_OUTPUT (decl) = 0;
646 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
647 lang_hooks.finish_incomplete_decl (decl);
650 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
651 needs to be output. Return true if it is output. */
654 wrapup_global_declaration_2 (tree decl)
656 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
659 /* Don't write out static consts, unless we still need them.
661 We also keep static consts if not optimizing (for debugging),
662 unless the user specified -fno-keep-static-consts.
663 ??? They might be better written into the debug information.
664 This is possible when using DWARF.
666 A language processor that wants static constants to be always
667 written out (even if it is not used) is responsible for
668 calling rest_of_decl_compilation itself. E.g. the C front-end
669 calls rest_of_decl_compilation from finish_decl.
670 One motivation for this is that is conventional in some
671 environments to write things like:
672 static const char rcsid[] = "... version string ...";
673 intending to force the string to be in the executable.
675 A language processor that would prefer to have unneeded
676 static constants "optimized away" would just defer writing
677 them out until here. E.g. C++ does this, because static
678 constants are often defined in header files.
680 ??? A tempting alternative (for both C and C++) would be
681 to force a constant to be written if and only if it is
682 defined in a main file, as opposed to an include file. */
684 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
686 struct varpool_node *node;
688 node = varpool_get_node (decl);
690 if (!node && flag_ltrans)
692 else if (node && node->finalized)
694 else if (node && node->alias)
696 else if (!cgraph_global_info_ready
698 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
700 else if (node && node->needed)
702 else if (DECL_COMDAT (decl))
704 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
705 && (optimize || !flag_keep_static_consts
706 || DECL_ARTIFICIAL (decl)))
711 rest_of_decl_compilation (decl, 1, 1);
719 /* Do any final processing required for the declarations in VEC, of
720 which there are LEN. We write out inline functions and variables
721 that have been deferred until this point, but which are required.
722 Returns nonzero if anything was put out. */
725 wrapup_global_declarations (tree *vec, int len)
727 bool reconsider, output_something = false;
730 for (i = 0; i < len; i++)
731 wrapup_global_declaration_1 (vec[i]);
733 /* Now emit any global variables or functions that we have been
734 putting off. We need to loop in case one of the things emitted
735 here references another one which comes earlier in the list. */
739 for (i = 0; i < len; i++)
740 reconsider |= wrapup_global_declaration_2 (vec[i]);
742 output_something = true;
746 return output_something;
749 /* A subroutine of check_global_declarations. Issue appropriate warnings
750 for the global declaration DECL. */
753 check_global_declaration_1 (tree decl)
755 /* Warn about any function declared static but not defined. We don't
756 warn about variables, because many programs have static variables
757 that exist only to get some text into the object file. */
758 if (TREE_CODE (decl) == FUNCTION_DECL
759 && DECL_INITIAL (decl) == 0
760 && DECL_EXTERNAL (decl)
761 && ! DECL_ARTIFICIAL (decl)
762 && ! TREE_NO_WARNING (decl)
763 && ! TREE_PUBLIC (decl)
764 && (warn_unused_function
765 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
767 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
768 pedwarn (input_location, 0, "%q+F used but never defined", decl);
770 warning (OPT_Wunused_function, "%q+F declared %<static%> but never defined", decl);
771 /* This symbol is effectively an "extern" declaration now. */
772 TREE_PUBLIC (decl) = 1;
773 assemble_external (decl);
776 /* Warn about static fns or vars defined but not used. */
777 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
778 /* We don't warn about "static const" variables because the
779 "rcs_id" idiom uses that construction. */
780 || (warn_unused_variable
781 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
782 && ! DECL_IN_SYSTEM_HEADER (decl)
783 && ! TREE_USED (decl)
784 /* The TREE_USED bit for file-scope decls is kept in the identifier,
785 to handle multiple external decls in different scopes. */
786 && ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl)))
787 && ! DECL_EXTERNAL (decl)
788 && ! TREE_PUBLIC (decl)
789 /* A volatile variable might be used in some non-obvious way. */
790 && ! TREE_THIS_VOLATILE (decl)
791 /* Global register variables must be declared to reserve them. */
792 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
793 /* Otherwise, ask the language. */
794 && lang_hooks.decls.warn_unused_global (decl))
795 warning ((TREE_CODE (decl) == FUNCTION_DECL)
796 ? OPT_Wunused_function
797 : OPT_Wunused_variable,
798 "%q+D defined but not used", decl);
801 /* Issue appropriate warnings for the global declarations in VEC (of
802 which there are LEN). */
805 check_global_declarations (tree *vec, int len)
809 for (i = 0; i < len; i++)
810 check_global_declaration_1 (vec[i]);
813 /* Emit debugging information for all global declarations in VEC. */
816 emit_debug_global_declarations (tree *vec, int len)
820 /* Avoid confusing the debug information machinery when there are errors. */
824 timevar_push (TV_SYMOUT);
825 for (i = 0; i < len; i++)
826 debug_hooks->global_decl (vec[i]);
827 timevar_pop (TV_SYMOUT);
830 /* Warn about a use of an identifier which was marked deprecated. */
832 warn_deprecated_use (tree node, tree attr)
836 if (node == 0 || !warn_deprecated_decl)
842 attr = DECL_ATTRIBUTES (node);
843 else if (TYPE_P (node))
845 tree decl = TYPE_STUB_DECL (node);
847 attr = lookup_attribute ("deprecated",
848 TYPE_ATTRIBUTES (TREE_TYPE (decl)));
853 attr = lookup_attribute ("deprecated", attr);
856 msg = TREE_STRING_POINTER (TREE_VALUE (TREE_VALUE (attr)));
862 expanded_location xloc = expand_location (DECL_SOURCE_LOCATION (node));
864 warning (OPT_Wdeprecated_declarations,
865 "%qD is deprecated (declared at %s:%d): %s",
866 node, xloc.file, xloc.line, msg);
868 warning (OPT_Wdeprecated_declarations,
869 "%qD is deprecated (declared at %s:%d)",
870 node, xloc.file, xloc.line);
872 else if (TYPE_P (node))
874 tree what = NULL_TREE;
875 tree decl = TYPE_STUB_DECL (node);
877 if (TYPE_NAME (node))
879 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
880 what = TYPE_NAME (node);
881 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
882 && DECL_NAME (TYPE_NAME (node)))
883 what = DECL_NAME (TYPE_NAME (node));
888 expanded_location xloc
889 = expand_location (DECL_SOURCE_LOCATION (decl));
893 warning (OPT_Wdeprecated_declarations,
894 "%qE is deprecated (declared at %s:%d): %s",
895 what, xloc.file, xloc.line, msg);
897 warning (OPT_Wdeprecated_declarations,
898 "%qE is deprecated (declared at %s:%d)", what,
899 xloc.file, xloc.line);
904 warning (OPT_Wdeprecated_declarations,
905 "type is deprecated (declared at %s:%d): %s",
906 xloc.file, xloc.line, msg);
908 warning (OPT_Wdeprecated_declarations,
909 "type is deprecated (declared at %s:%d)",
910 xloc.file, xloc.line);
918 warning (OPT_Wdeprecated_declarations, "%qE is deprecated: %s",
921 warning (OPT_Wdeprecated_declarations, "%qE is deprecated", what);
926 warning (OPT_Wdeprecated_declarations, "type is deprecated: %s",
929 warning (OPT_Wdeprecated_declarations, "type is deprecated");
935 /* Compile an entire translation unit. Write a file of assembly
936 output and various debugging dumps. */
941 /* Initialize yet another pass. */
943 ggc_protect_identifiers = true;
946 init_final (main_input_filename);
947 coverage_init (aux_base_name);
949 invoke_plugin_callbacks (PLUGIN_START_UNIT, NULL);
951 timevar_push (TV_PARSE);
953 /* Call the parser, which parses the entire file (calling
954 rest_of_compilation for each function). */
955 lang_hooks.parse_file (set_yydebug);
957 /* Compilation is now finished except for writing
958 what's left of the symbol table output. */
959 timevar_pop (TV_PARSE);
961 if (flag_syntax_only || flag_wpa)
964 ggc_protect_identifiers = false;
966 /* This must also call cgraph_finalize_compilation_unit. */
967 lang_hooks.decls.final_write_globals ();
972 varpool_assemble_pending_decls ();
975 /* Likewise for mudflap static object registrations. */
977 mudflap_finish_file ();
979 output_shared_constant_pool ();
980 output_object_blocks ();
982 /* Write out any pending weak symbol declarations. */
985 /* This must be at the end before unwind and debug info.
986 Some target ports emit PIC setup thunks here. */
987 targetm.asm_out.code_end ();
989 /* Do dbx symbols. */
990 timevar_push (TV_SYMOUT);
992 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
993 if (dwarf2out_do_frame ())
994 dwarf2out_frame_finish ();
997 (*debug_hooks->finish) (main_input_filename);
998 timevar_pop (TV_SYMOUT);
1000 /* Output some stuff at end of file if nec. */
1002 dw2_output_indirect_constants ();
1004 /* Flush any pending external directives. */
1005 process_pending_assemble_externals ();
1007 /* Emit LTO marker if LTO info has been previously emitted. This is
1008 used by collect2 to determine whether an object file contains IL.
1009 We used to emit an undefined reference here, but this produces
1010 link errors if an object file with IL is stored into a shared
1011 library without invoking lto1. */
1012 if (flag_generate_lto)
1014 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1015 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
1017 (unsigned HOST_WIDE_INT) 1, 8);
1018 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1019 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_v1",
1020 (unsigned HOST_WIDE_INT) 1, 8);
1022 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_v1",
1023 (unsigned HOST_WIDE_INT) 1,
1024 (unsigned HOST_WIDE_INT) 1);
1028 /* Attach a special .ident directive to the end of the file to identify
1029 the version of GCC which compiled this code. The format of the .ident
1030 string is patterned after the ones produced by native SVR4 compilers. */
1034 const char *pkg_version = "(GNU) ";
1036 if (strcmp ("(GCC) ", pkgversion_string))
1037 pkg_version = pkgversion_string;
1038 fprintf (asm_out_file, "%s\"GCC: %s%s\"\n",
1039 IDENT_ASM_OP, pkg_version, version_string);
1043 /* Invoke registered plugin callbacks. */
1044 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT, NULL);
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, MPC 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. As of
1137 gmp-4.3.0, GMP always uses the 3 number format. */
1138 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
1139 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3(X)
1140 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
1141 #define GCC_GMP_VERSION \
1142 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
1143 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
1144 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
1145 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR)
1147 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
1148 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) "." \
1149 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_PATCHLEVEL)
1152 file == stderr ? _(fmt2) : fmt2,
1153 GCC_GMP_STRINGIFY_VERSION, MPFR_VERSION_STRING, MPC_VERSION_STRING);
1154 if (strcmp (GCC_GMP_STRINGIFY_VERSION, gmp_version))
1156 file == stderr ? _(fmt3) : fmt3,
1157 indent, *indent != 0 ? " " : "",
1158 "GMP", GCC_GMP_STRINGIFY_VERSION, gmp_version);
1159 if (strcmp (MPFR_VERSION_STRING, mpfr_get_version ()))
1161 file == stderr ? _(fmt3) : fmt3,
1162 indent, *indent != 0 ? " " : "",
1163 "MPFR", MPFR_VERSION_STRING, mpfr_get_version ());
1164 if (strcmp (MPC_VERSION_STRING, mpc_get_version ()))
1166 file == stderr ? _(fmt3) : fmt3,
1167 indent, *indent != 0 ? " " : "",
1168 "MPC", MPC_VERSION_STRING, mpc_get_version ());
1170 file == stderr ? _(fmt4) : fmt4,
1171 indent, *indent != 0 ? " " : "",
1172 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
1174 print_plugins_versions (file, indent);
1177 #ifdef ASM_COMMENT_START
1179 print_to_asm_out_file (print_switch_type type, const char * text)
1181 bool prepend_sep = true;
1185 case SWITCH_TYPE_LINE_END:
1186 putc ('\n', asm_out_file);
1189 case SWITCH_TYPE_LINE_START:
1190 fputs (ASM_COMMENT_START, asm_out_file);
1191 return strlen (ASM_COMMENT_START);
1193 case SWITCH_TYPE_DESCRIPTIVE:
1194 if (ASM_COMMENT_START[0] == 0)
1195 prepend_sep = false;
1197 case SWITCH_TYPE_PASSED:
1198 case SWITCH_TYPE_ENABLED:
1200 fputc (' ', asm_out_file);
1201 fputs (text, asm_out_file);
1202 /* No need to return the length here as
1203 print_single_switch has already done it. */
1213 print_to_stderr (print_switch_type type, const char * text)
1217 case SWITCH_TYPE_LINE_END:
1218 putc ('\n', stderr);
1221 case SWITCH_TYPE_LINE_START:
1224 case SWITCH_TYPE_PASSED:
1225 case SWITCH_TYPE_ENABLED:
1226 fputc (' ', stderr);
1229 case SWITCH_TYPE_DESCRIPTIVE:
1230 fputs (text, stderr);
1231 /* No need to return the length here as
1232 print_single_switch has already done it. */
1240 /* Print an option value and return the adjusted position in the line.
1241 ??? print_fn doesn't handle errors, eg disk full; presumably other
1242 code will catch a disk full though. */
1245 print_single_switch (print_switch_fn_type print_fn,
1247 print_switch_type type,
1250 /* The ultrix fprintf returns 0 on success, so compute the result
1251 we want here since we need it for the following test. The +1
1252 is for the separator character that will probably be emitted. */
1253 int len = strlen (text) + 1;
1256 && pos + len > MAX_LINE)
1258 print_fn (SWITCH_TYPE_LINE_END, NULL);
1263 pos += print_fn (SWITCH_TYPE_LINE_START, NULL);
1265 print_fn (type, text);
1269 /* Print active target switches using PRINT_FN.
1270 POS is the current cursor position and MAX is the size of a "line".
1271 Each line begins with INDENT and ends with TERM.
1272 Each switch is separated from the next by SEP. */
1275 print_switch_values (print_switch_fn_type print_fn)
1280 /* Fill in the -frandom-seed option, if the user didn't pass it, so
1281 that it can be printed below. This helps reproducibility. */
1282 if (!flag_random_seed)
1283 init_random_seed ();
1285 /* Print the options as passed. */
1286 pos = print_single_switch (print_fn, pos,
1287 SWITCH_TYPE_DESCRIPTIVE, _("options passed: "));
1289 for (j = 1; j < save_decoded_options_count; j++)
1291 switch (save_decoded_options[j].opt_index)
1304 pos = print_single_switch (print_fn, pos, SWITCH_TYPE_PASSED,
1305 save_decoded_options[j].orig_option_with_args_text);
1309 print_fn (SWITCH_TYPE_LINE_END, NULL);
1311 /* Print the -f and -m options that have been enabled.
1312 We don't handle language specific options but printing argv
1314 pos = print_single_switch (print_fn, 0,
1315 SWITCH_TYPE_DESCRIPTIVE, _("options enabled: "));
1317 for (j = 0; j < cl_options_count; j++)
1318 if ((cl_options[j].flags & CL_REPORT)
1319 && option_enabled (j) > 0)
1320 pos = print_single_switch (print_fn, pos,
1321 SWITCH_TYPE_ENABLED, cl_options[j].opt_text);
1323 print_fn (SWITCH_TYPE_LINE_END, NULL);
1326 /* Open assembly code output file. Do this even if -fsyntax-only is
1327 on, because then the driver will have provided the name of a
1328 temporary file or bit bucket for us. NAME is the file specified on
1329 the command line, possibly NULL. */
1331 init_asm_output (const char *name)
1333 if (name == NULL && asm_file_name == 0)
1334 asm_out_file = stdout;
1337 if (asm_file_name == 0)
1339 int len = strlen (dump_base_name);
1340 char *dumpname = XNEWVEC (char, len + 6);
1342 memcpy (dumpname, dump_base_name, len + 1);
1343 strip_off_ending (dumpname, len);
1344 strcat (dumpname, ".s");
1345 asm_file_name = dumpname;
1347 if (!strcmp (asm_file_name, "-"))
1348 asm_out_file = stdout;
1350 asm_out_file = fopen (asm_file_name, "w+b");
1351 if (asm_out_file == 0)
1352 fatal_error ("can%'t open %s for writing: %m", asm_file_name);
1355 if (!flag_syntax_only)
1357 targetm.asm_out.file_start ();
1359 if (flag_record_gcc_switches)
1361 if (targetm.asm_out.record_gcc_switches)
1363 /* Let the target know that we are about to start recording. */
1364 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
1366 /* Now record the switches. */
1367 print_switch_values (targetm.asm_out.record_gcc_switches);
1368 /* Let the target know that the recording is over. */
1369 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
1373 inform (input_location, "-frecord-gcc-switches is not supported by the current target");
1376 #ifdef ASM_COMMENT_START
1377 if (flag_verbose_asm)
1379 /* Print the list of switches in effect
1380 into the assembler file as comments. */
1381 print_version (asm_out_file, ASM_COMMENT_START);
1382 print_switch_values (print_to_asm_out_file);
1383 putc ('\n', asm_out_file);
1389 /* Return true if the state of option OPTION should be stored in PCH files
1390 and checked by default_pch_valid_p. Store the option's current state
1394 option_affects_pch_p (int option, struct cl_option_state *state)
1396 if ((cl_options[option].flags & CL_TARGET) == 0)
1398 if (cl_options[option].flag_var == &target_flags)
1399 if (targetm.check_pch_target_flags)
1401 return get_option_state (option, state);
1404 /* Default version of get_pch_validity.
1405 By default, every flag difference is fatal; that will be mostly right for
1406 most targets, but completely right for very few. */
1409 default_get_pch_validity (size_t *sz)
1411 struct cl_option_state state;
1416 if (targetm.check_pch_target_flags)
1417 *sz += sizeof (target_flags);
1418 for (i = 0; i < cl_options_count; i++)
1419 if (option_affects_pch_p (i, &state))
1422 result = r = XNEWVEC (char, *sz);
1426 if (targetm.check_pch_target_flags)
1428 memcpy (r, &target_flags, sizeof (target_flags));
1429 r += sizeof (target_flags);
1432 for (i = 0; i < cl_options_count; i++)
1433 if (option_affects_pch_p (i, &state))
1435 memcpy (r, state.data, state.size);
1442 /* Return a message which says that a PCH file was created with a different
1443 setting of OPTION. */
1446 pch_option_mismatch (const char *option)
1450 asprintf (&r, _("created and used with differing settings of '%s'"), option);
1452 return _("out of memory");
1456 /* Default version of pch_valid_p. */
1459 default_pch_valid_p (const void *data_p, size_t len)
1461 struct cl_option_state state;
1462 const char *data = (const char *)data_p;
1465 /* -fpic and -fpie also usually make a PCH invalid. */
1466 if (data[0] != flag_pic)
1467 return _("created and used with different settings of -fpic");
1468 if (data[1] != flag_pie)
1469 return _("created and used with different settings of -fpie");
1472 /* Check target_flags. */
1473 if (targetm.check_pch_target_flags)
1478 memcpy (&tf, data, sizeof (target_flags));
1479 data += sizeof (target_flags);
1480 len -= sizeof (target_flags);
1481 r = targetm.check_pch_target_flags (tf);
1486 for (i = 0; i < cl_options_count; i++)
1487 if (option_affects_pch_p (i, &state))
1489 if (memcmp (data, state.data, state.size) != 0)
1490 return pch_option_mismatch (cl_options[i].opt_text);
1498 /* Default tree printer. Handles declarations only. */
1500 default_tree_printer (pretty_printer *pp, text_info *text, const char *spec,
1501 int precision, bool wide, bool set_locus, bool hash)
1505 /* FUTURE: %+x should set the locus. */
1506 if (precision != 0 || wide || hash)
1512 t = va_arg (*text->args_ptr, tree);
1513 if (TREE_CODE (t) == IDENTIFIER_NODE)
1515 pp_identifier (pp, IDENTIFIER_POINTER (t));
1521 t = va_arg (*text->args_ptr, tree);
1522 if (DECL_DEBUG_EXPR_IS_FROM (t) && DECL_DEBUG_EXPR (t))
1523 t = DECL_DEBUG_EXPR (t);
1528 t = va_arg (*text->args_ptr, tree);
1532 percent_K_format (text);
1539 if (set_locus && text->locus)
1540 *text->locus = DECL_SOURCE_LOCATION (t);
1544 const char *n = DECL_NAME (t)
1545 ? identifier_to_locale (lang_hooks.decl_printable_name (t, 2))
1550 dump_generic_node (pp, t, 0, TDF_DIAGNOSTIC, 0);
1555 /* A helper function; used as the reallocator function for cpp's line
1558 realloc_for_line_map (void *ptr, size_t len)
1560 return GGC_RESIZEVAR (void, ptr, len);
1563 /* A helper function: used as the allocator function for
1564 identifier_to_locale. */
1566 alloc_for_identifier_to_locale (size_t len)
1568 return ggc_alloc_atomic (len);
1571 /* Output stack usage information. */
1573 output_stack_usage (void)
1575 static bool warning_issued = false;
1576 enum stack_usage_kind_type { STATIC = 0, DYNAMIC, DYNAMIC_BOUNDED };
1577 const char *stack_usage_kind_str[] = {
1582 HOST_WIDE_INT stack_usage = current_function_static_stack_size;
1583 enum stack_usage_kind_type stack_usage_kind;
1584 expanded_location loc;
1585 const char *raw_id, *id;
1587 if (stack_usage < 0)
1589 if (!warning_issued)
1591 warning (0, "-fstack-usage not supported for this target");
1592 warning_issued = true;
1597 stack_usage_kind = STATIC;
1599 /* Add the maximum amount of space pushed onto the stack. */
1600 if (current_function_pushed_stack_size > 0)
1602 stack_usage += current_function_pushed_stack_size;
1603 stack_usage_kind = DYNAMIC_BOUNDED;
1606 /* Now on to the tricky part: dynamic stack allocation. */
1607 if (current_function_allocates_dynamic_stack_space)
1609 if (current_function_has_unbounded_dynamic_stack_size)
1610 stack_usage_kind = DYNAMIC;
1612 stack_usage_kind = DYNAMIC_BOUNDED;
1614 /* Add the size even in the unbounded case, this can't hurt. */
1615 stack_usage += current_function_dynamic_stack_size;
1618 loc = expand_location (DECL_SOURCE_LOCATION (current_function_decl));
1620 /* Strip the scope prefix if any. */
1621 raw_id = lang_hooks.decl_printable_name (current_function_decl, 2);
1622 id = strrchr (raw_id, '.');
1628 fprintf (stack_usage_file,
1629 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC"\t%s\n",
1630 lbasename (loc.file),
1635 stack_usage_kind_str[stack_usage_kind]);
1638 /* Open an auxiliary output file. */
1640 open_auxiliary_file (const char *ext)
1645 filename = concat (aux_base_name, ".", ext, NULL);
1646 file = fopen (filename, "w");
1648 fatal_error ("can't open %s for writing: %m", filename);
1653 /* Initialization of the front end environment, before command line
1654 options are parsed. Signal handlers, internationalization etc.
1655 ARGV0 is main's argv[0]. */
1657 general_init (const char *argv0)
1661 p = argv0 + strlen (argv0);
1662 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1666 xmalloc_set_program_name (progname);
1670 /* Unlock the stdio streams. */
1671 unlock_std_streams ();
1673 gcc_init_libintl ();
1675 identifier_to_locale_alloc = alloc_for_identifier_to_locale;
1676 identifier_to_locale_free = ggc_free;
1678 /* Initialize the diagnostics reporting machinery, so option parsing
1679 can give warnings and errors. */
1680 diagnostic_initialize (global_dc, N_OPTS);
1681 diagnostic_starter (global_dc) = default_tree_diagnostic_starter;
1682 /* Set a default printer. Language specific initializations will
1683 override it later. */
1684 pp_format_decoder (global_dc->printer) = &default_tree_printer;
1685 global_dc->show_option_requested = flag_diagnostics_show_option;
1686 global_dc->show_column = flag_show_column;
1687 global_dc->internal_error = plugins_internal_error_function;
1688 global_dc->option_enabled = option_enabled;
1689 global_dc->option_name = option_name;
1691 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1693 signal (SIGSEGV, crash_signal);
1696 signal (SIGILL, crash_signal);
1699 signal (SIGBUS, crash_signal);
1702 signal (SIGABRT, crash_signal);
1704 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1705 signal (SIGIOT, crash_signal);
1708 signal (SIGFPE, crash_signal);
1711 /* Other host-specific signal setup. */
1712 (*host_hooks.extra_signals)();
1714 /* Initialize the garbage-collector, string pools and tree type hash
1718 line_table = ggc_alloc_line_maps ();
1719 linemap_init (line_table);
1720 line_table->reallocator = realloc_for_line_map;
1723 /* Initialize register usage now so switches may override. */
1726 /* Register the language-independent parameters. */
1727 add_params (lang_independent_params, LAST_PARAM);
1729 /* This must be done after add_params but before argument processing. */
1730 init_ggc_heuristics();
1731 init_optimization_passes ();
1732 statistics_early_init ();
1735 /* Return true if the current target supports -fsection-anchors. */
1738 target_supports_section_anchors_p (void)
1740 if (targetm.min_anchor_offset == 0 && targetm.max_anchor_offset == 0)
1743 if (targetm.asm_out.output_anchor == NULL)
1749 /* Default the align_* variables to 1 if they're still unset, and
1750 set up the align_*_log variables. */
1752 init_alignments (void)
1754 if (align_loops <= 0)
1756 if (align_loops_max_skip > align_loops)
1757 align_loops_max_skip = align_loops - 1;
1758 align_loops_log = floor_log2 (align_loops * 2 - 1);
1759 if (align_jumps <= 0)
1761 if (align_jumps_max_skip > align_jumps)
1762 align_jumps_max_skip = align_jumps - 1;
1763 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1764 if (align_labels <= 0)
1766 align_labels_log = floor_log2 (align_labels * 2 - 1);
1767 if (align_labels_max_skip > align_labels)
1768 align_labels_max_skip = align_labels - 1;
1769 if (align_functions <= 0)
1770 align_functions = 1;
1771 align_functions_log = floor_log2 (align_functions * 2 - 1);
1774 /* Process the options that have been parsed. */
1776 process_options (void)
1778 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1779 This can happen with incorrect pre-processed input. */
1780 debug_hooks = &do_nothing_debug_hooks;
1782 /* This replaces set_Wunused. */
1783 if (warn_unused_function == -1)
1784 warn_unused_function = warn_unused;
1785 if (warn_unused_label == -1)
1786 warn_unused_label = warn_unused;
1787 /* Wunused-parameter is enabled if both -Wunused -Wextra are enabled. */
1788 if (warn_unused_parameter == -1)
1789 warn_unused_parameter = (warn_unused && extra_warnings);
1790 if (warn_unused_variable == -1)
1791 warn_unused_variable = warn_unused;
1792 /* Wunused-but-set-parameter is enabled if both -Wunused -Wextra are
1794 if (warn_unused_but_set_parameter == -1)
1795 warn_unused_but_set_parameter = (warn_unused && extra_warnings);
1796 if (warn_unused_but_set_variable == -1)
1797 warn_unused_but_set_variable = warn_unused;
1798 if (warn_unused_value == -1)
1799 warn_unused_value = warn_unused;
1801 /* This replaces set_Wextra. */
1802 if (warn_uninitialized == -1)
1803 warn_uninitialized = extra_warnings;
1805 /* Allow the front end to perform consistency checks and do further
1806 initialization based on the command line options. This hook also
1807 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1808 so we can correctly initialize debug output. */
1809 no_backend = lang_hooks.post_options (&main_input_filename);
1811 /* Some machines may reject certain combinations of options. */
1812 targetm.target_option.override ();
1814 /* Avoid any informative notes in the second run of -fcompare-debug. */
1815 if (flag_compare_debug)
1816 diagnostic_inhibit_notes (global_dc);
1818 if (flag_section_anchors && !target_supports_section_anchors_p ())
1820 warning (OPT_fsection_anchors,
1821 "this target does not support %qs", "-fsection-anchors");
1822 flag_section_anchors = 0;
1825 if (flag_short_enums == 2)
1826 flag_short_enums = targetm.default_short_enums ();
1828 /* Set aux_base_name if not already set. */
1831 else if (main_input_filename)
1833 char *name = xstrdup (lbasename (main_input_filename));
1835 strip_off_ending (name, strlen (name));
1836 aux_base_name = name;
1839 aux_base_name = "gccaux";
1844 || flag_loop_interchange
1845 || flag_loop_strip_mine
1846 || flag_graphite_identity
1847 || flag_loop_parallelize_all)
1848 sorry ("Graphite loop optimizations cannot be used");
1851 /* Unrolling all loops implies that standard loop unrolling must also
1853 if (flag_unroll_all_loops)
1854 flag_unroll_loops = 1;
1856 /* The loop unrolling code assumes that cse will be run after loop.
1857 web and rename-registers also help when run after loop unrolling. */
1858 if (flag_rerun_cse_after_loop == AUTODETECT_VALUE)
1859 flag_rerun_cse_after_loop = flag_unroll_loops || flag_peel_loops;
1861 if (flag_web == AUTODETECT_VALUE)
1862 flag_web = flag_unroll_loops || flag_peel_loops;
1864 if (flag_rename_registers == AUTODETECT_VALUE)
1865 flag_rename_registers = flag_unroll_loops || flag_peel_loops;
1867 if (flag_non_call_exceptions)
1868 flag_asynchronous_unwind_tables = 1;
1869 if (flag_asynchronous_unwind_tables)
1870 flag_unwind_tables = 1;
1872 if (flag_value_profile_transformations)
1873 flag_profile_values = 1;
1875 /* Warn about options that are not supported on this machine. */
1876 #ifndef INSN_SCHEDULING
1877 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1878 warning (0, "instruction scheduling not supported on this target machine");
1881 if (flag_delayed_branch)
1882 warning (0, "this target machine does not have delayed branches");
1885 user_label_prefix = USER_LABEL_PREFIX;
1886 if (flag_leading_underscore != -1)
1888 /* If the default prefix is more complicated than "" or "_",
1889 issue a warning and ignore this option. */
1890 if (user_label_prefix[0] == 0 ||
1891 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1893 user_label_prefix = flag_leading_underscore ? "_" : "";
1896 warning (0, "-f%sleading-underscore not supported on this target machine",
1897 flag_leading_underscore ? "" : "no-");
1900 /* If we are in verbose mode, write out the version and maybe all the
1901 option flags in use. */
1904 print_version (stderr, "");
1906 print_switch_values (print_to_stderr);
1909 if (flag_syntax_only)
1911 write_symbols = NO_DEBUG;
1917 if (debug_info_level == DINFO_LEVEL_NONE)
1919 debug_info_level = DINFO_LEVEL_NORMAL;
1921 if (write_symbols == NO_DEBUG)
1922 write_symbols = PREFERRED_DEBUGGING_TYPE;
1925 debug_info_level = DINFO_LEVEL_NONE;
1928 if (flag_dump_final_insns && !flag_syntax_only && !no_backend)
1930 FILE *final_output = fopen (flag_dump_final_insns, "w");
1933 error ("could not open final insn dump file %qs: %m",
1934 flag_dump_final_insns);
1935 flag_dump_final_insns = NULL;
1937 else if (fclose (final_output))
1939 error ("could not close zeroed insn dump file %qs: %m",
1940 flag_dump_final_insns);
1941 flag_dump_final_insns = NULL;
1945 /* Unless over-ridden for the target, assume that all DWARF levels
1946 may be emitted, if DWARF2_DEBUG is selected. */
1947 if (dwarf_strict < 0)
1950 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1952 if (debug_info_level == DINFO_LEVEL_NONE)
1953 write_symbols = NO_DEBUG;
1955 if (write_symbols == NO_DEBUG)
1957 #if defined(DBX_DEBUGGING_INFO)
1958 else if (write_symbols == DBX_DEBUG)
1959 debug_hooks = &dbx_debug_hooks;
1961 #if defined(XCOFF_DEBUGGING_INFO)
1962 else if (write_symbols == XCOFF_DEBUG)
1963 debug_hooks = &xcoff_debug_hooks;
1965 #ifdef SDB_DEBUGGING_INFO
1966 else if (write_symbols == SDB_DEBUG)
1967 debug_hooks = &sdb_debug_hooks;
1969 #ifdef DWARF2_DEBUGGING_INFO
1970 else if (write_symbols == DWARF2_DEBUG)
1971 debug_hooks = &dwarf2_debug_hooks;
1973 #ifdef VMS_DEBUGGING_INFO
1974 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1975 debug_hooks = &vmsdbg_debug_hooks;
1978 error ("target system does not support the \"%s\" debug format",
1979 debug_type_names[write_symbols]);
1981 /* We know which debug output will be used so we can set flag_var_tracking
1982 and flag_var_tracking_uninit if the user has not specified them. */
1983 if (debug_info_level < DINFO_LEVEL_NORMAL
1984 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
1986 if (flag_var_tracking == 1
1987 || flag_var_tracking_uninit == 1)
1989 if (debug_info_level < DINFO_LEVEL_NORMAL)
1990 warning (0, "variable tracking requested, but useless unless "
1991 "producing debug info");
1993 warning (0, "variable tracking requested, but not supported "
1994 "by this debug format");
1996 flag_var_tracking = 0;
1997 flag_var_tracking_uninit = 0;
2000 /* If the user specifically requested variable tracking with tagging
2001 uninitialized variables, we need to turn on variable tracking.
2002 (We already determined above that variable tracking is feasible.) */
2003 if (flag_var_tracking_uninit)
2004 flag_var_tracking = 1;
2006 if (flag_var_tracking == AUTODETECT_VALUE)
2007 flag_var_tracking = optimize >= 1;
2009 if (flag_var_tracking_assignments == AUTODETECT_VALUE)
2010 flag_var_tracking_assignments = flag_var_tracking
2011 && !(flag_selective_scheduling || flag_selective_scheduling2);
2013 if (flag_var_tracking_assignments_toggle)
2014 flag_var_tracking_assignments = !flag_var_tracking_assignments;
2016 if (flag_var_tracking_assignments && !flag_var_tracking)
2017 flag_var_tracking = flag_var_tracking_assignments = -1;
2019 if (flag_var_tracking_assignments
2020 && (flag_selective_scheduling || flag_selective_scheduling2))
2021 warning (0, "var-tracking-assignments changes selective scheduling");
2023 if (flag_tree_cselim == AUTODETECT_VALUE)
2024 #ifdef HAVE_conditional_move
2025 flag_tree_cselim = 1;
2027 flag_tree_cselim = 0;
2030 /* If auxiliary info generation is desired, open the output file.
2031 This goes in the same directory as the source file--unlike
2032 all the other output files. */
2033 if (flag_gen_aux_info)
2035 aux_info_file = fopen (aux_info_file_name, "w");
2036 if (aux_info_file == 0)
2037 fatal_error ("can%'t open %s: %m", aux_info_file_name);
2040 if (! targetm.have_named_sections)
2042 if (flag_function_sections)
2044 warning (0, "-ffunction-sections not supported for this target");
2045 flag_function_sections = 0;
2047 if (flag_data_sections)
2049 warning (0, "-fdata-sections not supported for this target");
2050 flag_data_sections = 0;
2054 if (flag_function_sections && profile_flag)
2056 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
2057 flag_function_sections = 0;
2060 #ifndef HAVE_prefetch
2061 if (flag_prefetch_loop_arrays > 0)
2063 warning (0, "-fprefetch-loop-arrays not supported for this target");
2064 flag_prefetch_loop_arrays = 0;
2067 if (flag_prefetch_loop_arrays > 0 && !HAVE_prefetch)
2069 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
2070 flag_prefetch_loop_arrays = 0;
2074 /* This combination of options isn't handled for i386 targets and doesn't
2075 make much sense anyway, so don't allow it. */
2076 if (flag_prefetch_loop_arrays > 0 && optimize_size)
2078 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
2079 flag_prefetch_loop_arrays = 0;
2082 /* The presence of IEEE signaling NaNs, implies all math can trap. */
2083 if (flag_signaling_nans)
2084 flag_trapping_math = 1;
2086 /* We cannot reassociate if we want traps or signed zeros. */
2087 if (flag_associative_math && (flag_trapping_math || flag_signed_zeros))
2089 warning (0, "-fassociative-math disabled; other options take precedence");
2090 flag_associative_math = 0;
2093 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
2094 if (flag_cx_limited_range)
2095 flag_complex_method = 0;
2097 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
2098 if (flag_cx_fortran_rules)
2099 flag_complex_method = 1;
2101 /* Targets must be able to place spill slots at lower addresses. If the
2102 target already uses a soft frame pointer, the transition is trivial. */
2103 if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
2105 warning (0, "-fstack-protector not supported for this target");
2106 flag_stack_protect = 0;
2108 if (!flag_stack_protect)
2109 warn_stack_protect = 0;
2111 /* ??? Unwind info is not correct around the CFG unless either a frame
2112 pointer is present or A_O_A is set. Fixing this requires rewriting
2113 unwind info generation to be aware of the CFG and propagating states
2115 if (flag_unwind_tables && !ACCUMULATE_OUTGOING_ARGS
2116 && flag_omit_frame_pointer)
2118 warning (0, "unwind tables currently require a frame pointer "
2120 flag_omit_frame_pointer = 0;
2123 /* Save the current optimization options. */
2124 optimization_default_node = build_optimization_node ();
2125 optimization_current_node = optimization_default_node;
2128 /* This function can be called multiple times to reinitialize the compiler
2129 back end when register classes or instruction sets have changed,
2130 before each function. */
2132 backend_init_target (void)
2134 /* Initialize alignment variables. */
2137 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
2138 to initialize reg_raw_mode[]. */
2141 /* This invokes target hooks to set fixed_reg[] etc, which is
2145 /* This depends on stack_pointer_rtx. */
2146 init_fake_stack_mems ();
2148 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
2150 init_alias_target ();
2152 /* Depends on HARD_FRAME_POINTER_REGNUM. */
2155 /* The following initialization functions need to generate rtl, so
2156 provide a dummy function context for them. */
2157 init_dummy_function_start ();
2159 /* rtx_cost is mode-dependent, so cached values need to be recomputed
2160 on a mode change. */
2163 /* We may need to recompute regno_save_code[] and regno_restore_code[]
2164 after a mode change as well. */
2165 caller_save_initialized_p = false;
2167 expand_dummy_function_end ();
2170 /* Initialize the compiler back end. This function is called only once,
2171 when starting the compiler. */
2178 init_inline_once ();
2179 init_varasm_once ();
2180 save_register_info ();
2182 /* Initialize the target-specific back end pieces. */
2184 backend_init_target ();
2187 /* Initialize excess precision settings. */
2189 init_excess_precision (void)
2191 /* Adjust excess precision handling based on the target options. If
2192 the front end cannot handle it, flag_excess_precision_cmdline
2193 will already have been set accordingly in the post_options
2195 gcc_assert (flag_excess_precision_cmdline != EXCESS_PRECISION_DEFAULT);
2196 flag_excess_precision = flag_excess_precision_cmdline;
2197 if (flag_unsafe_math_optimizations)
2198 flag_excess_precision = EXCESS_PRECISION_FAST;
2199 if (flag_excess_precision == EXCESS_PRECISION_STANDARD)
2201 int flt_eval_method = TARGET_FLT_EVAL_METHOD;
2202 switch (flt_eval_method)
2206 /* Either the target acts unpredictably (-1) or has all the
2207 operations required not to have excess precision (0). */
2208 flag_excess_precision = EXCESS_PRECISION_FAST;
2212 /* In these cases, predictable excess precision makes
2216 /* Any other implementation-defined FLT_EVAL_METHOD values
2217 require the compiler to handle the associated excess
2218 precision rules in excess_precision_type. */
2224 /* Initialize things that are both lang-dependent and target-dependent.
2225 This function can be called more than once if target parameters change. */
2227 lang_dependent_init_target (void)
2229 /* This determines excess precision settings. */
2230 init_excess_precision ();
2232 /* This creates various _DECL nodes, so needs to be called after the
2233 front end is initialized. It also depends on the HAVE_xxx macros
2234 generated from the target machine description. */
2237 /* The following initialization functions need to generate rtl, so
2238 provide a dummy function context for them. */
2239 init_dummy_function_start ();
2241 /* Do the target-specific parts of expr initialization. */
2242 init_expr_target ();
2244 /* Although the actions of these functions are language-independent,
2245 they use optabs, so we cannot call them from backend_init. */
2249 expand_dummy_function_end ();
2252 /* Language-dependent initialization. Returns nonzero on success. */
2254 lang_dependent_init (const char *name)
2256 location_t save_loc = input_location;
2257 if (dump_base_name == 0)
2258 dump_base_name = name && name[0] ? name : "gccdump";
2260 /* Other front-end initialization. */
2261 input_location = BUILTINS_LOCATION;
2262 if (lang_hooks.init () == 0)
2264 input_location = save_loc;
2266 init_asm_output (name);
2268 /* If stack usage information is desired, open the output file. */
2269 if (flag_stack_usage)
2270 stack_usage_file = open_auxiliary_file ("su");
2272 /* This creates various _DECL nodes, so needs to be called after the
2273 front end is initialized. */
2276 /* Do the target-specific parts of the initialization. */
2277 lang_dependent_init_target ();
2279 /* If dbx symbol table desired, initialize writing it and output the
2280 predefined types. */
2281 timevar_push (TV_SYMOUT);
2283 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
2284 if (dwarf2out_do_frame ())
2285 dwarf2out_frame_init ();
2288 /* Now we have the correct original filename, we can initialize
2290 (*debug_hooks->init) (name);
2292 timevar_pop (TV_SYMOUT);
2298 /* Reinitialize everything when target parameters, such as register usage,
2301 target_reinit (void)
2303 /* Reinitialize RTL backend. */
2304 backend_init_target ();
2306 /* Reinitialize lang-dependent parts. */
2307 lang_dependent_init_target ();
2311 dump_memory_report (bool final)
2313 ggc_print_statistics ();
2314 stringpool_statistics ();
2315 dump_tree_statistics ();
2316 dump_gimple_statistics ();
2317 dump_rtx_statistics ();
2318 dump_alloc_pool_statistics ();
2319 dump_bitmap_statistics ();
2320 dump_vec_loc_statistics ();
2321 dump_ggc_loc_statistics (final);
2322 dump_alias_stats (stderr);
2323 dump_pta_stats (stderr);
2326 /* Clean up: close opened files, etc. */
2331 /* Close the dump files. */
2332 if (flag_gen_aux_info)
2334 fclose (aux_info_file);
2336 unlink (aux_info_file_name);
2339 /* Close non-debugging input and output files. Take special care to note
2340 whether fclose returns an error, since the pages might still be on the
2341 buffer chain while the file is open. */
2345 if (ferror (asm_out_file) != 0)
2346 fatal_error ("error writing to %s: %m", asm_file_name);
2347 if (fclose (asm_out_file) != 0)
2348 fatal_error ("error closing %s: %m", asm_file_name);
2350 unlink_if_ordinary (asm_file_name);
2353 if (stack_usage_file)
2354 fclose (stack_usage_file);
2357 finish_optimization_passes ();
2362 dump_memory_report (true);
2364 /* Language-specific end of compilation actions. */
2365 lang_hooks.finish ();
2368 /* Initialize the compiler, and compile the input file. */
2372 /* Initialize timing first. The C front ends read the main file in
2373 the post_options hook, and C++ does file timings. */
2374 if (time_report || !quiet_flag || flag_detailed_statistics)
2376 timevar_start (TV_TOTAL);
2380 /* Don't do any more if an error has already occurred. */
2383 /* This must be run always, because it is needed to compute the FP
2384 predefined macros, such as __LDBL_MAX__, for targets using non
2385 default FP formats. */
2386 init_adjust_machine_modes ();
2388 /* Set up the back-end if requested. */
2392 /* Language-dependent initialization. Returns true on success. */
2393 if (lang_dependent_init (main_input_filename))
2399 /* Stop timing and print the times. */
2400 timevar_stop (TV_TOTAL);
2401 timevar_print (stderr);
2404 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2405 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2406 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2408 It is not safe to call this function more than once. */
2411 toplev_main (int argc, char **argv)
2413 expandargv (&argc, &argv);
2415 /* Initialization of GCC's environment, and diagnostics. */
2416 general_init (argv[0]);
2418 /* Parse the options and do minimal processing; basically just
2419 enough to default flags appropriately. */
2420 decode_options (argc, CONST_CAST2 (const char **, char **, argv),
2421 &save_decoded_options, &save_decoded_options_count);
2425 initialize_plugins ();
2428 print_version (stderr, "");
2431 print_plugins_help (stderr, "");
2433 /* Exit early if we can (e.g. -help). */
2434 if (!exit_after_options)
2437 if (warningcount || errorcount)
2438 print_ignored_options ();
2439 diagnostic_finish (global_dc);
2441 /* Invoke registered plugin callbacks if any. */
2442 invoke_plugin_callbacks (PLUGIN_FINISH, NULL);
2444 finalize_plugins ();
2446 return (FATAL_EXIT_CODE);
2448 return (SUCCESS_EXIT_CODE);