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 /* True if we don't need a backend (e.g. preprocessing only). */
121 static bool no_backend;
123 /* Length of line when printing switch values. */
126 /* Decoded options, and number of such options. */
127 struct cl_decoded_option *save_decoded_options;
128 unsigned int save_decoded_options_count;
130 /* Name of top-level original source file (what was input to cpp).
131 This comes from the #-command at the beginning of the actual input.
132 If there isn't any there, then this is the cc1 input file name. */
134 const char *main_input_filename;
136 /* Pointer to base name in main_input_filename, with directories and a
137 single final extension removed, and the length of this base
139 const char *main_input_basename;
140 int main_input_baselength;
142 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
143 to optimize in process_options (). */
144 #define AUTODETECT_VALUE 2
146 /* Prefix for profile data files */
147 const char *profile_data_prefix;
149 /* Debug hooks - dependent upon command line options. */
151 const struct gcc_debug_hooks *debug_hooks;
153 /* Other flags saying which kinds of debugging dump have been requested. */
155 int rtl_dump_and_exit;
156 int flag_print_asm_name;
157 enum graph_dump_types graph_dump_format;
159 /* True if this is the lto front end. This is used to disable
160 gimple generation and lowering passes that are normally run on the
161 output of a front end. These passes must be bypassed for lto since
162 they have already been done before the gimple was written. */
164 bool in_lto_p = false;
166 /* The FUNCTION_DECL for the function currently being compiled,
167 or 0 if between functions. */
168 tree current_function_decl;
170 /* Set to the FUNC_BEGIN label of the current function, or NULL
172 const char * current_function_func_begin_label;
174 /* A random sequence of characters, unless overridden by user. */
175 static const char *flag_random_seed;
177 /* A local time stamp derived from the time of compilation. It will be
178 zero if the system cannot provide a time. It will be -1u, if the
179 user has specified a particular random seed. */
184 /* Generate code for GNU or NeXT Objective-C runtime environment. */
186 #ifdef NEXT_OBJC_RUNTIME
187 int flag_next_runtime = 1;
189 int flag_next_runtime = 0;
192 /* Nonzero means make permerror produce warnings instead of errors. */
194 int flag_permissive = 0;
196 /* -dA causes debug commentary information to be produced in
197 the generated assembly code (to make it more readable). This option
198 is generally only of use to those who actually need to read the
199 generated assembly code (perhaps while debugging the compiler itself).
200 Currently, this switch is only used by dwarfout.c; however, it is intended
201 to be a catchall for printing debug information in the assembler file. */
203 int flag_debug_asm = 0;
205 /* -dP causes the rtl to be emitted as a comment in assembly. */
207 int flag_dump_rtl_in_asm = 0;
209 /* When non-NULL, indicates that whenever space is allocated on the
210 stack, the resulting stack pointer must not pass this
211 address---that is, for stacks that grow downward, the stack pointer
212 must always be greater than or equal to this address; for stacks
213 that grow upward, the stack pointer must be less than this address.
214 At present, the rtx may be either a REG or a SYMBOL_REF, although
215 the support provided depends on the backend. */
218 /* Type of stack check. */
219 enum stack_check_type flag_stack_check = NO_STACK_CHECK;
221 /* True if the user has tagged the function with the 'section'
224 bool user_defined_section_attribute = false;
226 struct target_flag_state default_target_flag_state;
227 #if SWITCHABLE_TARGET
228 struct target_flag_state *this_target_flag_state = &default_target_flag_state;
230 #define this_target_flag_state (&default_target_flag_state)
235 const char *const string;
239 lang_independent_options;
241 /* The user symbol prefix after having resolved same. */
242 const char *user_label_prefix;
244 static const param_info lang_independent_params[] = {
245 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
246 { OPTION, DEFAULT, MIN, MAX, HELP },
247 #include "params.def"
249 { NULL, 0, 0, 0, NULL }
252 /* Output files for assembler code (real compiler output)
253 and debugging dumps. */
257 FILE *stack_usage_file = NULL;
258 FILE *dump_file = NULL;
259 const char *dump_file_name;
261 /* The current working directory of a translation. It's generally the
262 directory from which compilation was initiated, but a preprocessed
263 file may specify the original directory in which it was
266 static const char *src_pwd;
268 /* Initialize src_pwd with the given string, and return true. If it
269 was already initialized, return false. As a special case, it may
270 be called with a NULL argument to test whether src_pwd has NOT been
274 set_src_pwd (const char *pwd)
278 if (strcmp (src_pwd, pwd) == 0)
284 src_pwd = xstrdup (pwd);
288 /* Return the directory from which the translation unit was initiated,
289 in case set_src_pwd() was not called before to assign it a
305 /* Called when the start of a function definition is parsed,
306 this function prints on stderr the name of the function. */
308 announce_function (tree decl)
312 if (rtl_dump_and_exit)
313 fprintf (stderr, "%s ",
314 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl))));
316 fprintf (stderr, " %s",
317 identifier_to_locale (lang_hooks.decl_printable_name (decl, 2)));
319 pp_needs_newline (global_dc->printer) = true;
320 diagnostic_set_last_function (global_dc, (diagnostic_info *) NULL);
324 /* Initialize local_tick with the time of day, or -1 if
325 flag_random_seed is set. */
328 init_local_tick (void)
330 if (!flag_random_seed)
332 /* Get some more or less random data. */
333 #ifdef HAVE_GETTIMEOFDAY
337 gettimeofday (&tv, NULL);
338 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
342 time_t now = time (NULL);
344 if (now != (time_t)-1)
345 local_tick = (unsigned) now;
353 /* Set up a default flag_random_seed and local_tick, unless the user
354 already specified one. Must be called after init_local_tick. */
357 init_random_seed (void)
359 unsigned HOST_WIDE_INT value;
360 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
362 value = local_tick ^ getpid ();
364 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
365 flag_random_seed = random_seed;
368 /* Obtain the random_seed string. Unless NOINIT, initialize it if
369 it's not provided in the command line. */
372 get_random_seed (bool noinit)
374 if (!flag_random_seed && !noinit)
376 return flag_random_seed;
379 /* Modify the random_seed string to VAL. Return its previous
383 set_random_seed (const char *val)
385 const char *old = flag_random_seed;
386 flag_random_seed = val;
390 #if GCC_VERSION < 3004
392 /* The functions clz_hwi, ctz_hwi, ffs_hwi, floor_log2 and exact_log2
393 are defined as inline functions in toplev.h if GCC_VERSION >= 3004.
394 The definitions here are used for older versions of gcc. */
396 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
397 If X is 0, return -1. */
400 floor_log2 (unsigned HOST_WIDE_INT x)
407 if (HOST_BITS_PER_WIDE_INT > 64)
408 if (x >= (unsigned HOST_WIDE_INT) 1 << (t + 64))
410 if (HOST_BITS_PER_WIDE_INT > 32)
411 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 32))
413 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 16))
415 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 8))
417 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 4))
419 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 2))
421 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 1))
427 /* Return the logarithm of X, base 2, considering X unsigned,
428 if X is a power of 2. Otherwise, returns -1. */
431 exact_log2 (unsigned HOST_WIDE_INT x)
435 return floor_log2 (x);
438 /* Given X, an unsigned number, return the number of least significant bits
439 that are zero. When X == 0, the result is the word size. */
442 ctz_hwi (unsigned HOST_WIDE_INT x)
444 return x ? floor_log2 (x & -x) : HOST_BITS_PER_WIDE_INT;
447 /* Similarly for most significant bits. */
450 clz_hwi (unsigned HOST_WIDE_INT x)
452 return HOST_BITS_PER_WIDE_INT - 1 - floor_log2(x);
455 /* Similar to ctz_hwi, except that the least significant bit is numbered
456 starting from 1, and X == 0 yields 0. */
459 ffs_hwi (unsigned HOST_WIDE_INT x)
461 return 1 + floor_log2 (x & -x);
464 #endif /* GCC_VERSION < 3004 */
466 /* Handler for fatal signals, such as SIGSEGV. These are transformed
467 into ICE messages, which is much more user friendly. In case the
468 error printer crashes, reset the signal to prevent infinite recursion. */
471 crash_signal (int signo)
473 signal (signo, SIG_DFL);
475 /* If we crashed while processing an ASM statement, then be a little more
476 graceful. It's most likely the user's fault. */
477 if (this_is_asm_operands)
479 output_operand_lossage ("unrecoverable error");
480 exit (FATAL_EXIT_CODE);
483 internal_error ("%s", strsignal (signo));
486 /* Arrange to dump core on error. (The regular error message is still
487 printed first, except in the case of abort().) */
490 setup_core_dumping (void)
493 signal (SIGABRT, SIG_DFL);
495 #if defined(HAVE_SETRLIMIT)
498 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
499 fatal_error ("getting core file size maximum limit: %m");
500 rlim.rlim_cur = rlim.rlim_max;
501 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
502 fatal_error ("setting core file size limit to maximum: %m");
505 diagnostic_abort_on_error (global_dc);
509 /* Strip off a legitimate source ending from the input string NAME of
510 length LEN. Rather than having to know the names used by all of
511 our front ends, we strip off an ending of a period followed by
512 up to five characters. (Java uses ".class".) */
515 strip_off_ending (char *name, int len)
518 for (i = 2; i < 6 && len > i; i++)
520 if (name[len - i] == '.')
522 name[len - i] = '\0';
528 /* Output a quoted string. */
531 output_quoted_string (FILE *asm_file, const char *string)
533 #ifdef OUTPUT_QUOTED_STRING
534 OUTPUT_QUOTED_STRING (asm_file, string);
538 putc ('\"', asm_file);
539 while ((c = *string++) != 0)
543 if (c == '\"' || c == '\\')
544 putc ('\\', asm_file);
548 fprintf (asm_file, "\\%03o", (unsigned char) c);
550 putc ('\"', asm_file);
554 /* A subroutine of wrapup_global_declarations. We've come to the end of
555 the compilation unit. All deferred variables should be undeferred,
556 and all incomplete decls should be finalized. */
559 wrapup_global_declaration_1 (tree decl)
561 /* We're not deferring this any longer. Assignment is conditional to
562 avoid needlessly dirtying PCH pages. */
563 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl), TS_DECL_WITH_VIS)
564 && DECL_DEFER_OUTPUT (decl) != 0)
565 DECL_DEFER_OUTPUT (decl) = 0;
567 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
568 lang_hooks.finish_incomplete_decl (decl);
571 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
572 needs to be output. Return true if it is output. */
575 wrapup_global_declaration_2 (tree decl)
577 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
580 /* Don't write out static consts, unless we still need them.
582 We also keep static consts if not optimizing (for debugging),
583 unless the user specified -fno-keep-static-consts.
584 ??? They might be better written into the debug information.
585 This is possible when using DWARF.
587 A language processor that wants static constants to be always
588 written out (even if it is not used) is responsible for
589 calling rest_of_decl_compilation itself. E.g. the C front-end
590 calls rest_of_decl_compilation from finish_decl.
591 One motivation for this is that is conventional in some
592 environments to write things like:
593 static const char rcsid[] = "... version string ...";
594 intending to force the string to be in the executable.
596 A language processor that would prefer to have unneeded
597 static constants "optimized away" would just defer writing
598 them out until here. E.g. C++ does this, because static
599 constants are often defined in header files.
601 ??? A tempting alternative (for both C and C++) would be
602 to force a constant to be written if and only if it is
603 defined in a main file, as opposed to an include file. */
605 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
607 struct varpool_node *node;
609 node = varpool_get_node (decl);
611 if (!node && flag_ltrans)
613 else if (node && node->finalized)
615 else if (node && node->alias)
617 else if (!cgraph_global_info_ready
619 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
621 else if (node && node->needed)
623 else if (DECL_COMDAT (decl))
625 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
626 && (optimize || !flag_keep_static_consts
627 || DECL_ARTIFICIAL (decl)))
632 rest_of_decl_compilation (decl, 1, 1);
640 /* Do any final processing required for the declarations in VEC, of
641 which there are LEN. We write out inline functions and variables
642 that have been deferred until this point, but which are required.
643 Returns nonzero if anything was put out. */
646 wrapup_global_declarations (tree *vec, int len)
648 bool reconsider, output_something = false;
651 for (i = 0; i < len; i++)
652 wrapup_global_declaration_1 (vec[i]);
654 /* Now emit any global variables or functions that we have been
655 putting off. We need to loop in case one of the things emitted
656 here references another one which comes earlier in the list. */
660 for (i = 0; i < len; i++)
661 reconsider |= wrapup_global_declaration_2 (vec[i]);
663 output_something = true;
667 return output_something;
670 /* A subroutine of check_global_declarations. Issue appropriate warnings
671 for the global declaration DECL. */
674 check_global_declaration_1 (tree decl)
676 /* Warn about any function declared static but not defined. We don't
677 warn about variables, because many programs have static variables
678 that exist only to get some text into the object file. */
679 if (TREE_CODE (decl) == FUNCTION_DECL
680 && DECL_INITIAL (decl) == 0
681 && DECL_EXTERNAL (decl)
682 && ! DECL_ARTIFICIAL (decl)
683 && ! TREE_NO_WARNING (decl)
684 && ! TREE_PUBLIC (decl)
685 && (warn_unused_function
686 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
688 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
689 pedwarn (input_location, 0, "%q+F used but never defined", decl);
691 warning (OPT_Wunused_function, "%q+F declared %<static%> but never defined", decl);
692 /* This symbol is effectively an "extern" declaration now. */
693 TREE_PUBLIC (decl) = 1;
694 assemble_external (decl);
697 /* Warn about static fns or vars defined but not used. */
698 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
699 /* We don't warn about "static const" variables because the
700 "rcs_id" idiom uses that construction. */
701 || (warn_unused_variable
702 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
703 && ! DECL_IN_SYSTEM_HEADER (decl)
704 && ! TREE_USED (decl)
705 /* The TREE_USED bit for file-scope decls is kept in the identifier,
706 to handle multiple external decls in different scopes. */
707 && ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl)))
708 && ! DECL_EXTERNAL (decl)
709 && ! TREE_PUBLIC (decl)
710 /* A volatile variable might be used in some non-obvious way. */
711 && ! TREE_THIS_VOLATILE (decl)
712 /* Global register variables must be declared to reserve them. */
713 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
714 /* Otherwise, ask the language. */
715 && lang_hooks.decls.warn_unused_global (decl))
716 warning ((TREE_CODE (decl) == FUNCTION_DECL)
717 ? OPT_Wunused_function
718 : OPT_Wunused_variable,
719 "%q+D defined but not used", decl);
722 /* Issue appropriate warnings for the global declarations in VEC (of
723 which there are LEN). */
726 check_global_declarations (tree *vec, int len)
730 for (i = 0; i < len; i++)
731 check_global_declaration_1 (vec[i]);
734 /* Emit debugging information for all global declarations in VEC. */
737 emit_debug_global_declarations (tree *vec, int len)
741 /* Avoid confusing the debug information machinery when there are errors. */
745 timevar_push (TV_SYMOUT);
746 for (i = 0; i < len; i++)
747 debug_hooks->global_decl (vec[i]);
748 timevar_pop (TV_SYMOUT);
751 /* Warn about a use of an identifier which was marked deprecated. */
753 warn_deprecated_use (tree node, tree attr)
757 if (node == 0 || !warn_deprecated_decl)
763 attr = DECL_ATTRIBUTES (node);
764 else if (TYPE_P (node))
766 tree decl = TYPE_STUB_DECL (node);
768 attr = lookup_attribute ("deprecated",
769 TYPE_ATTRIBUTES (TREE_TYPE (decl)));
774 attr = lookup_attribute ("deprecated", attr);
777 msg = TREE_STRING_POINTER (TREE_VALUE (TREE_VALUE (attr)));
783 expanded_location xloc = expand_location (DECL_SOURCE_LOCATION (node));
785 warning (OPT_Wdeprecated_declarations,
786 "%qD is deprecated (declared at %s:%d): %s",
787 node, xloc.file, xloc.line, msg);
789 warning (OPT_Wdeprecated_declarations,
790 "%qD is deprecated (declared at %s:%d)",
791 node, xloc.file, xloc.line);
793 else if (TYPE_P (node))
795 tree what = NULL_TREE;
796 tree decl = TYPE_STUB_DECL (node);
798 if (TYPE_NAME (node))
800 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
801 what = TYPE_NAME (node);
802 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
803 && DECL_NAME (TYPE_NAME (node)))
804 what = DECL_NAME (TYPE_NAME (node));
809 expanded_location xloc
810 = expand_location (DECL_SOURCE_LOCATION (decl));
814 warning (OPT_Wdeprecated_declarations,
815 "%qE is deprecated (declared at %s:%d): %s",
816 what, xloc.file, xloc.line, msg);
818 warning (OPT_Wdeprecated_declarations,
819 "%qE is deprecated (declared at %s:%d)", what,
820 xloc.file, xloc.line);
825 warning (OPT_Wdeprecated_declarations,
826 "type is deprecated (declared at %s:%d): %s",
827 xloc.file, xloc.line, msg);
829 warning (OPT_Wdeprecated_declarations,
830 "type is deprecated (declared at %s:%d)",
831 xloc.file, xloc.line);
839 warning (OPT_Wdeprecated_declarations, "%qE is deprecated: %s",
842 warning (OPT_Wdeprecated_declarations, "%qE is deprecated", what);
847 warning (OPT_Wdeprecated_declarations, "type is deprecated: %s",
850 warning (OPT_Wdeprecated_declarations, "type is deprecated");
856 /* Compile an entire translation unit. Write a file of assembly
857 output and various debugging dumps. */
862 /* Initialize yet another pass. */
864 ggc_protect_identifiers = true;
867 init_final (main_input_filename);
868 coverage_init (aux_base_name);
870 invoke_plugin_callbacks (PLUGIN_START_UNIT, NULL);
872 timevar_push (TV_PARSE);
874 /* Call the parser, which parses the entire file (calling
875 rest_of_compilation for each function). */
876 lang_hooks.parse_file ();
878 /* Compilation is now finished except for writing
879 what's left of the symbol table output. */
880 timevar_pop (TV_PARSE);
882 if (flag_syntax_only || flag_wpa)
885 ggc_protect_identifiers = false;
887 /* This must also call cgraph_finalize_compilation_unit. */
888 lang_hooks.decls.final_write_globals ();
893 varpool_assemble_pending_decls ();
896 /* Likewise for mudflap static object registrations. */
898 mudflap_finish_file ();
900 output_shared_constant_pool ();
901 output_object_blocks ();
903 /* Write out any pending weak symbol declarations. */
906 /* This must be at the end before unwind and debug info.
907 Some target ports emit PIC setup thunks here. */
908 targetm.asm_out.code_end ();
910 /* Do dbx symbols. */
911 timevar_push (TV_SYMOUT);
913 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
914 if (dwarf2out_do_frame ())
915 dwarf2out_frame_finish ();
918 (*debug_hooks->finish) (main_input_filename);
919 timevar_pop (TV_SYMOUT);
921 /* Output some stuff at end of file if nec. */
923 dw2_output_indirect_constants ();
925 /* Flush any pending external directives. */
926 process_pending_assemble_externals ();
928 /* Emit LTO marker if LTO info has been previously emitted. This is
929 used by collect2 to determine whether an object file contains IL.
930 We used to emit an undefined reference here, but this produces
931 link errors if an object file with IL is stored into a shared
932 library without invoking lto1. */
933 if (flag_generate_lto)
935 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
936 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
938 (unsigned HOST_WIDE_INT) 1, 8);
939 #elif defined ASM_OUTPUT_ALIGNED_COMMON
940 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_v1",
941 (unsigned HOST_WIDE_INT) 1, 8);
943 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_v1",
944 (unsigned HOST_WIDE_INT) 1,
945 (unsigned HOST_WIDE_INT) 1);
949 /* Attach a special .ident directive to the end of the file to identify
950 the version of GCC which compiled this code. The format of the .ident
951 string is patterned after the ones produced by native SVR4 compilers. */
955 const char *pkg_version = "(GNU) ";
957 if (strcmp ("(GCC) ", pkgversion_string))
958 pkg_version = pkgversion_string;
959 fprintf (asm_out_file, "%s\"GCC: %s%s\"\n",
960 IDENT_ASM_OP, pkg_version, version_string);
964 /* Invoke registered plugin callbacks. */
965 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT, NULL);
967 /* This must be at the end. Some target ports emit end of file directives
968 into the assembly file here, and hence we can not output anything to the
969 assembly file after this point. */
970 targetm.asm_out.file_end ();
973 /* Parse a -d... command line switch. */
976 decode_d_option (const char *arg)
987 flag_print_asm_name = 1;
990 flag_dump_rtl_in_asm = 1;
991 flag_print_asm_name = 1;
994 graph_dump_format = vcg;
997 rtl_dump_and_exit = 1;
999 case 'D': /* These are handled by the preprocessor. */
1006 setup_core_dumping();
1009 enable_rtl_dump_file ();
1013 warning (0, "unrecognized gcc debugging option: %c", c);
1018 /* Indexed by enum debug_info_type. */
1019 const char *const debug_type_names[] =
1021 "none", "stabs", "coff", "dwarf-2", "xcoff", "vms"
1024 /* Print version information to FILE.
1025 Each line begins with INDENT (for the case where FILE is the
1026 assembler output file). */
1029 print_version (FILE *file, const char *indent)
1031 static const char fmt1[] =
1033 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
1035 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
1038 static const char fmt2[] =
1039 N_("GMP version %s, MPFR version %s, MPC version %s\n");
1040 static const char fmt3[] =
1041 N_("%s%swarning: %s header version %s differs from library version %s.\n");
1042 static const char fmt4[] =
1043 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
1045 #define __VERSION__ "[?]"
1048 file == stderr ? _(fmt1) : fmt1,
1049 indent, *indent != 0 ? " " : "",
1050 lang_hooks.name, pkgversion_string, version_string, TARGET_NAME,
1051 indent, __VERSION__);
1053 /* We need to stringify the GMP macro values. Ugh, gmp_version has
1054 two string formats, "i.j.k" and "i.j" when k is zero. As of
1055 gmp-4.3.0, GMP always uses the 3 number format. */
1056 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
1057 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3(X)
1058 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
1059 #define GCC_GMP_VERSION \
1060 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
1061 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
1062 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
1063 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR)
1065 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
1066 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) "." \
1067 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_PATCHLEVEL)
1070 file == stderr ? _(fmt2) : fmt2,
1071 GCC_GMP_STRINGIFY_VERSION, MPFR_VERSION_STRING, MPC_VERSION_STRING);
1072 if (strcmp (GCC_GMP_STRINGIFY_VERSION, gmp_version))
1074 file == stderr ? _(fmt3) : fmt3,
1075 indent, *indent != 0 ? " " : "",
1076 "GMP", GCC_GMP_STRINGIFY_VERSION, gmp_version);
1077 if (strcmp (MPFR_VERSION_STRING, mpfr_get_version ()))
1079 file == stderr ? _(fmt3) : fmt3,
1080 indent, *indent != 0 ? " " : "",
1081 "MPFR", MPFR_VERSION_STRING, mpfr_get_version ());
1082 if (strcmp (MPC_VERSION_STRING, mpc_get_version ()))
1084 file == stderr ? _(fmt3) : fmt3,
1085 indent, *indent != 0 ? " " : "",
1086 "MPC", MPC_VERSION_STRING, mpc_get_version ());
1088 file == stderr ? _(fmt4) : fmt4,
1089 indent, *indent != 0 ? " " : "",
1090 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
1092 print_plugins_versions (file, indent);
1095 #ifdef ASM_COMMENT_START
1097 print_to_asm_out_file (print_switch_type type, const char * text)
1099 bool prepend_sep = true;
1103 case SWITCH_TYPE_LINE_END:
1104 putc ('\n', asm_out_file);
1107 case SWITCH_TYPE_LINE_START:
1108 fputs (ASM_COMMENT_START, asm_out_file);
1109 return strlen (ASM_COMMENT_START);
1111 case SWITCH_TYPE_DESCRIPTIVE:
1112 if (ASM_COMMENT_START[0] == 0)
1113 prepend_sep = false;
1115 case SWITCH_TYPE_PASSED:
1116 case SWITCH_TYPE_ENABLED:
1118 fputc (' ', asm_out_file);
1119 fputs (text, asm_out_file);
1120 /* No need to return the length here as
1121 print_single_switch has already done it. */
1131 print_to_stderr (print_switch_type type, const char * text)
1135 case SWITCH_TYPE_LINE_END:
1136 putc ('\n', stderr);
1139 case SWITCH_TYPE_LINE_START:
1142 case SWITCH_TYPE_PASSED:
1143 case SWITCH_TYPE_ENABLED:
1144 fputc (' ', stderr);
1147 case SWITCH_TYPE_DESCRIPTIVE:
1148 fputs (text, stderr);
1149 /* No need to return the length here as
1150 print_single_switch has already done it. */
1158 /* Print an option value and return the adjusted position in the line.
1159 ??? print_fn doesn't handle errors, eg disk full; presumably other
1160 code will catch a disk full though. */
1163 print_single_switch (print_switch_fn_type print_fn,
1165 print_switch_type type,
1168 /* The ultrix fprintf returns 0 on success, so compute the result
1169 we want here since we need it for the following test. The +1
1170 is for the separator character that will probably be emitted. */
1171 int len = strlen (text) + 1;
1174 && pos + len > MAX_LINE)
1176 print_fn (SWITCH_TYPE_LINE_END, NULL);
1181 pos += print_fn (SWITCH_TYPE_LINE_START, NULL);
1183 print_fn (type, text);
1187 /* Print active target switches using PRINT_FN.
1188 POS is the current cursor position and MAX is the size of a "line".
1189 Each line begins with INDENT and ends with TERM.
1190 Each switch is separated from the next by SEP. */
1193 print_switch_values (print_switch_fn_type print_fn)
1198 /* Fill in the -frandom-seed option, if the user didn't pass it, so
1199 that it can be printed below. This helps reproducibility. */
1200 if (!flag_random_seed)
1201 init_random_seed ();
1203 /* Print the options as passed. */
1204 pos = print_single_switch (print_fn, pos,
1205 SWITCH_TYPE_DESCRIPTIVE, _("options passed: "));
1207 for (j = 1; j < save_decoded_options_count; j++)
1209 switch (save_decoded_options[j].opt_index)
1222 pos = print_single_switch (print_fn, pos, SWITCH_TYPE_PASSED,
1223 save_decoded_options[j].orig_option_with_args_text);
1227 print_fn (SWITCH_TYPE_LINE_END, NULL);
1229 /* Print the -f and -m options that have been enabled.
1230 We don't handle language specific options but printing argv
1232 pos = print_single_switch (print_fn, 0,
1233 SWITCH_TYPE_DESCRIPTIVE, _("options enabled: "));
1235 for (j = 0; j < cl_options_count; j++)
1236 if ((cl_options[j].flags & CL_REPORT)
1237 && option_enabled (j, &global_options) > 0)
1238 pos = print_single_switch (print_fn, pos,
1239 SWITCH_TYPE_ENABLED, cl_options[j].opt_text);
1241 print_fn (SWITCH_TYPE_LINE_END, NULL);
1244 /* Open assembly code output file. Do this even if -fsyntax-only is
1245 on, because then the driver will have provided the name of a
1246 temporary file or bit bucket for us. NAME is the file specified on
1247 the command line, possibly NULL. */
1249 init_asm_output (const char *name)
1251 if (name == NULL && asm_file_name == 0)
1252 asm_out_file = stdout;
1255 if (asm_file_name == 0)
1257 int len = strlen (dump_base_name);
1258 char *dumpname = XNEWVEC (char, len + 6);
1260 memcpy (dumpname, dump_base_name, len + 1);
1261 strip_off_ending (dumpname, len);
1262 strcat (dumpname, ".s");
1263 asm_file_name = dumpname;
1265 if (!strcmp (asm_file_name, "-"))
1266 asm_out_file = stdout;
1268 asm_out_file = fopen (asm_file_name, "w+b");
1269 if (asm_out_file == 0)
1270 fatal_error ("can%'t open %s for writing: %m", asm_file_name);
1273 if (!flag_syntax_only)
1275 targetm.asm_out.file_start ();
1277 if (flag_record_gcc_switches)
1279 if (targetm.asm_out.record_gcc_switches)
1281 /* Let the target know that we are about to start recording. */
1282 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
1284 /* Now record the switches. */
1285 print_switch_values (targetm.asm_out.record_gcc_switches);
1286 /* Let the target know that the recording is over. */
1287 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
1291 inform (input_location, "-frecord-gcc-switches is not supported by the current target");
1294 #ifdef ASM_COMMENT_START
1295 if (flag_verbose_asm)
1297 /* Print the list of switches in effect
1298 into the assembler file as comments. */
1299 print_version (asm_out_file, ASM_COMMENT_START);
1300 print_switch_values (print_to_asm_out_file);
1301 putc ('\n', asm_out_file);
1307 /* Return true if the state of option OPTION should be stored in PCH files
1308 and checked by default_pch_valid_p. Store the option's current state
1312 option_affects_pch_p (int option, struct cl_option_state *state)
1314 if ((cl_options[option].flags & CL_TARGET) == 0)
1316 if (option_flag_var (option, &global_options) == &target_flags)
1317 if (targetm.check_pch_target_flags)
1319 return get_option_state (&global_options, option, state);
1322 /* Default version of get_pch_validity.
1323 By default, every flag difference is fatal; that will be mostly right for
1324 most targets, but completely right for very few. */
1327 default_get_pch_validity (size_t *sz)
1329 struct cl_option_state state;
1334 if (targetm.check_pch_target_flags)
1335 *sz += sizeof (target_flags);
1336 for (i = 0; i < cl_options_count; i++)
1337 if (option_affects_pch_p (i, &state))
1340 result = r = XNEWVEC (char, *sz);
1344 if (targetm.check_pch_target_flags)
1346 memcpy (r, &target_flags, sizeof (target_flags));
1347 r += sizeof (target_flags);
1350 for (i = 0; i < cl_options_count; i++)
1351 if (option_affects_pch_p (i, &state))
1353 memcpy (r, state.data, state.size);
1360 /* Return a message which says that a PCH file was created with a different
1361 setting of OPTION. */
1364 pch_option_mismatch (const char *option)
1368 asprintf (&r, _("created and used with differing settings of '%s'"), option);
1370 return _("out of memory");
1374 /* Default version of pch_valid_p. */
1377 default_pch_valid_p (const void *data_p, size_t len)
1379 struct cl_option_state state;
1380 const char *data = (const char *)data_p;
1383 /* -fpic and -fpie also usually make a PCH invalid. */
1384 if (data[0] != flag_pic)
1385 return _("created and used with different settings of -fpic");
1386 if (data[1] != flag_pie)
1387 return _("created and used with different settings of -fpie");
1390 /* Check target_flags. */
1391 if (targetm.check_pch_target_flags)
1396 memcpy (&tf, data, sizeof (target_flags));
1397 data += sizeof (target_flags);
1398 len -= sizeof (target_flags);
1399 r = targetm.check_pch_target_flags (tf);
1404 for (i = 0; i < cl_options_count; i++)
1405 if (option_affects_pch_p (i, &state))
1407 if (memcmp (data, state.data, state.size) != 0)
1408 return pch_option_mismatch (cl_options[i].opt_text);
1416 /* Default tree printer. Handles declarations only. */
1418 default_tree_printer (pretty_printer *pp, text_info *text, const char *spec,
1419 int precision, bool wide, bool set_locus, bool hash)
1423 /* FUTURE: %+x should set the locus. */
1424 if (precision != 0 || wide || hash)
1430 t = va_arg (*text->args_ptr, tree);
1431 if (TREE_CODE (t) == IDENTIFIER_NODE)
1433 pp_identifier (pp, IDENTIFIER_POINTER (t));
1439 t = va_arg (*text->args_ptr, tree);
1440 if (DECL_DEBUG_EXPR_IS_FROM (t) && DECL_DEBUG_EXPR (t))
1441 t = DECL_DEBUG_EXPR (t);
1446 t = va_arg (*text->args_ptr, tree);
1450 percent_K_format (text);
1457 if (set_locus && text->locus)
1458 *text->locus = DECL_SOURCE_LOCATION (t);
1462 const char *n = DECL_NAME (t)
1463 ? identifier_to_locale (lang_hooks.decl_printable_name (t, 2))
1468 dump_generic_node (pp, t, 0, TDF_DIAGNOSTIC, 0);
1473 /* A helper function; used as the reallocator function for cpp's line
1476 realloc_for_line_map (void *ptr, size_t len)
1478 return GGC_RESIZEVAR (void, ptr, len);
1481 /* A helper function: used as the allocator function for
1482 identifier_to_locale. */
1484 alloc_for_identifier_to_locale (size_t len)
1486 return ggc_alloc_atomic (len);
1489 /* Output stack usage information. */
1491 output_stack_usage (void)
1493 static bool warning_issued = false;
1494 enum stack_usage_kind_type { STATIC = 0, DYNAMIC, DYNAMIC_BOUNDED };
1495 const char *stack_usage_kind_str[] = {
1500 HOST_WIDE_INT stack_usage = current_function_static_stack_size;
1501 enum stack_usage_kind_type stack_usage_kind;
1502 expanded_location loc;
1503 const char *raw_id, *id;
1505 if (stack_usage < 0)
1507 if (!warning_issued)
1509 warning (0, "-fstack-usage not supported for this target");
1510 warning_issued = true;
1515 stack_usage_kind = STATIC;
1517 /* Add the maximum amount of space pushed onto the stack. */
1518 if (current_function_pushed_stack_size > 0)
1520 stack_usage += current_function_pushed_stack_size;
1521 stack_usage_kind = DYNAMIC_BOUNDED;
1524 /* Now on to the tricky part: dynamic stack allocation. */
1525 if (current_function_allocates_dynamic_stack_space)
1527 if (current_function_has_unbounded_dynamic_stack_size)
1528 stack_usage_kind = DYNAMIC;
1530 stack_usage_kind = DYNAMIC_BOUNDED;
1532 /* Add the size even in the unbounded case, this can't hurt. */
1533 stack_usage += current_function_dynamic_stack_size;
1536 loc = expand_location (DECL_SOURCE_LOCATION (current_function_decl));
1538 /* Strip the scope prefix if any. */
1539 raw_id = lang_hooks.decl_printable_name (current_function_decl, 2);
1540 id = strrchr (raw_id, '.');
1546 fprintf (stack_usage_file,
1547 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC"\t%s\n",
1548 lbasename (loc.file),
1553 stack_usage_kind_str[stack_usage_kind]);
1556 /* Open an auxiliary output file. */
1558 open_auxiliary_file (const char *ext)
1563 filename = concat (aux_base_name, ".", ext, NULL);
1564 file = fopen (filename, "w");
1566 fatal_error ("can%'t open %s for writing: %m", filename);
1571 /* Initialization of the front end environment, before command line
1572 options are parsed. Signal handlers, internationalization etc.
1573 ARGV0 is main's argv[0]. */
1575 general_init (const char *argv0)
1579 p = argv0 + strlen (argv0);
1580 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1584 xmalloc_set_program_name (progname);
1588 /* Unlock the stdio streams. */
1589 unlock_std_streams ();
1591 gcc_init_libintl ();
1593 identifier_to_locale_alloc = alloc_for_identifier_to_locale;
1594 identifier_to_locale_free = ggc_free;
1596 /* Initialize the diagnostics reporting machinery, so option parsing
1597 can give warnings and errors. */
1598 diagnostic_initialize (global_dc, N_OPTS);
1599 diagnostic_starter (global_dc) = default_tree_diagnostic_starter;
1600 /* Set a default printer. Language specific initializations will
1601 override it later. */
1602 pp_format_decoder (global_dc->printer) = &default_tree_printer;
1603 global_dc->show_option_requested
1604 = global_options_init.x_flag_diagnostics_show_option;
1605 global_dc->show_column
1606 = global_options_init.x_flag_show_column;
1607 global_dc->internal_error = plugins_internal_error_function;
1608 global_dc->option_enabled = option_enabled;
1609 global_dc->option_state = &global_options;
1610 global_dc->option_name = option_name;
1612 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1614 signal (SIGSEGV, crash_signal);
1617 signal (SIGILL, crash_signal);
1620 signal (SIGBUS, crash_signal);
1623 signal (SIGABRT, crash_signal);
1625 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1626 signal (SIGIOT, crash_signal);
1629 signal (SIGFPE, crash_signal);
1632 /* Other host-specific signal setup. */
1633 (*host_hooks.extra_signals)();
1635 /* Initialize the garbage-collector, string pools and tree type hash
1639 line_table = ggc_alloc_line_maps ();
1640 linemap_init (line_table);
1641 line_table->reallocator = realloc_for_line_map;
1644 /* Initialize register usage now so switches may override. */
1647 /* Register the language-independent parameters. */
1648 add_params (lang_independent_params, LAST_PARAM);
1649 targetm.target_option.default_params ();
1651 /* This must be done after add_params but before argument processing. */
1652 init_ggc_heuristics();
1653 init_optimization_passes ();
1654 statistics_early_init ();
1658 /* Return true if the current target supports -fsection-anchors. */
1661 target_supports_section_anchors_p (void)
1663 if (targetm.min_anchor_offset == 0 && targetm.max_anchor_offset == 0)
1666 if (targetm.asm_out.output_anchor == NULL)
1672 /* Default the align_* variables to 1 if they're still unset, and
1673 set up the align_*_log variables. */
1675 init_alignments (void)
1677 if (align_loops <= 0)
1679 if (align_loops_max_skip > align_loops)
1680 align_loops_max_skip = align_loops - 1;
1681 align_loops_log = floor_log2 (align_loops * 2 - 1);
1682 if (align_jumps <= 0)
1684 if (align_jumps_max_skip > align_jumps)
1685 align_jumps_max_skip = align_jumps - 1;
1686 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1687 if (align_labels <= 0)
1689 align_labels_log = floor_log2 (align_labels * 2 - 1);
1690 if (align_labels_max_skip > align_labels)
1691 align_labels_max_skip = align_labels - 1;
1692 if (align_functions <= 0)
1693 align_functions = 1;
1694 align_functions_log = floor_log2 (align_functions * 2 - 1);
1697 /* Process the options that have been parsed. */
1699 process_options (void)
1701 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1702 This can happen with incorrect pre-processed input. */
1703 debug_hooks = &do_nothing_debug_hooks;
1705 /* This replaces set_Wunused. */
1706 if (warn_unused_function == -1)
1707 warn_unused_function = warn_unused;
1708 if (warn_unused_label == -1)
1709 warn_unused_label = warn_unused;
1710 /* Wunused-parameter is enabled if both -Wunused -Wextra are enabled. */
1711 if (warn_unused_parameter == -1)
1712 warn_unused_parameter = (warn_unused && extra_warnings);
1713 if (warn_unused_variable == -1)
1714 warn_unused_variable = warn_unused;
1715 /* Wunused-but-set-parameter is enabled if both -Wunused -Wextra are
1717 if (warn_unused_but_set_parameter == -1)
1718 warn_unused_but_set_parameter = (warn_unused && extra_warnings);
1719 if (warn_unused_but_set_variable == -1)
1720 warn_unused_but_set_variable = warn_unused;
1721 if (warn_unused_value == -1)
1722 warn_unused_value = warn_unused;
1724 /* This replaces set_Wextra. */
1725 if (warn_uninitialized == -1)
1726 warn_uninitialized = extra_warnings;
1728 /* Allow the front end to perform consistency checks and do further
1729 initialization based on the command line options. This hook also
1730 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1731 so we can correctly initialize debug output. */
1732 no_backend = lang_hooks.post_options (&main_input_filename);
1734 /* Some machines may reject certain combinations of options. */
1735 targetm.target_option.override ();
1737 /* Avoid any informative notes in the second run of -fcompare-debug. */
1738 if (flag_compare_debug)
1739 diagnostic_inhibit_notes (global_dc);
1741 if (flag_section_anchors && !target_supports_section_anchors_p ())
1743 warning (OPT_fsection_anchors,
1744 "this target does not support %qs", "-fsection-anchors");
1745 flag_section_anchors = 0;
1748 if (flag_short_enums == 2)
1749 flag_short_enums = targetm.default_short_enums ();
1751 /* Set aux_base_name if not already set. */
1754 else if (main_input_filename)
1756 char *name = xstrdup (lbasename (main_input_filename));
1758 strip_off_ending (name, strlen (name));
1759 aux_base_name = name;
1762 aux_base_name = "gccaux";
1767 || flag_loop_interchange
1768 || flag_loop_strip_mine
1769 || flag_graphite_identity
1770 || flag_loop_parallelize_all)
1771 sorry ("Graphite loop optimizations cannot be used");
1774 /* Unrolling all loops implies that standard loop unrolling must also
1776 if (flag_unroll_all_loops)
1777 flag_unroll_loops = 1;
1779 /* web and rename-registers help when run after loop unrolling. */
1780 if (flag_web == AUTODETECT_VALUE)
1781 flag_web = flag_unroll_loops || flag_peel_loops;
1783 if (flag_rename_registers == AUTODETECT_VALUE)
1784 flag_rename_registers = flag_unroll_loops || flag_peel_loops;
1786 if (flag_non_call_exceptions)
1787 flag_asynchronous_unwind_tables = 1;
1788 if (flag_asynchronous_unwind_tables)
1789 flag_unwind_tables = 1;
1791 if (flag_value_profile_transformations)
1792 flag_profile_values = 1;
1794 /* Warn about options that are not supported on this machine. */
1795 #ifndef INSN_SCHEDULING
1796 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1797 warning (0, "instruction scheduling not supported on this target machine");
1800 if (flag_delayed_branch)
1801 warning (0, "this target machine does not have delayed branches");
1804 user_label_prefix = USER_LABEL_PREFIX;
1805 if (flag_leading_underscore != -1)
1807 /* If the default prefix is more complicated than "" or "_",
1808 issue a warning and ignore this option. */
1809 if (user_label_prefix[0] == 0 ||
1810 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1812 user_label_prefix = flag_leading_underscore ? "_" : "";
1815 warning (0, "-f%sleading-underscore not supported on this target machine",
1816 flag_leading_underscore ? "" : "no-");
1819 /* If we are in verbose mode, write out the version and maybe all the
1820 option flags in use. */
1823 print_version (stderr, "");
1825 print_switch_values (print_to_stderr);
1828 if (flag_syntax_only)
1830 write_symbols = NO_DEBUG;
1836 if (debug_info_level == DINFO_LEVEL_NONE)
1838 debug_info_level = DINFO_LEVEL_NORMAL;
1840 if (write_symbols == NO_DEBUG)
1841 write_symbols = PREFERRED_DEBUGGING_TYPE;
1844 debug_info_level = DINFO_LEVEL_NONE;
1847 if (flag_dump_final_insns && !flag_syntax_only && !no_backend)
1849 FILE *final_output = fopen (flag_dump_final_insns, "w");
1852 error ("could not open final insn dump file %qs: %m",
1853 flag_dump_final_insns);
1854 flag_dump_final_insns = NULL;
1856 else if (fclose (final_output))
1858 error ("could not close zeroed insn dump file %qs: %m",
1859 flag_dump_final_insns);
1860 flag_dump_final_insns = NULL;
1864 /* Unless over-ridden for the target, assume that all DWARF levels
1865 may be emitted, if DWARF2_DEBUG is selected. */
1866 if (dwarf_strict < 0)
1869 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1871 if (debug_info_level == DINFO_LEVEL_NONE)
1872 write_symbols = NO_DEBUG;
1874 if (write_symbols == NO_DEBUG)
1876 #if defined(DBX_DEBUGGING_INFO)
1877 else if (write_symbols == DBX_DEBUG)
1878 debug_hooks = &dbx_debug_hooks;
1880 #if defined(XCOFF_DEBUGGING_INFO)
1881 else if (write_symbols == XCOFF_DEBUG)
1882 debug_hooks = &xcoff_debug_hooks;
1884 #ifdef SDB_DEBUGGING_INFO
1885 else if (write_symbols == SDB_DEBUG)
1886 debug_hooks = &sdb_debug_hooks;
1888 #ifdef DWARF2_DEBUGGING_INFO
1889 else if (write_symbols == DWARF2_DEBUG)
1890 debug_hooks = &dwarf2_debug_hooks;
1892 #ifdef VMS_DEBUGGING_INFO
1893 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1894 debug_hooks = &vmsdbg_debug_hooks;
1897 error ("target system does not support the \"%s\" debug format",
1898 debug_type_names[write_symbols]);
1900 /* We know which debug output will be used so we can set flag_var_tracking
1901 and flag_var_tracking_uninit if the user has not specified them. */
1902 if (debug_info_level < DINFO_LEVEL_NORMAL
1903 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
1905 if (flag_var_tracking == 1
1906 || flag_var_tracking_uninit == 1)
1908 if (debug_info_level < DINFO_LEVEL_NORMAL)
1909 warning (0, "variable tracking requested, but useless unless "
1910 "producing debug info");
1912 warning (0, "variable tracking requested, but not supported "
1913 "by this debug format");
1915 flag_var_tracking = 0;
1916 flag_var_tracking_uninit = 0;
1919 /* The debug hooks are used to implement -fdump-go-spec because it
1920 gives a simple and stable API for all the information we need to
1922 if (flag_dump_go_spec != NULL)
1923 debug_hooks = dump_go_spec_init (flag_dump_go_spec, debug_hooks);
1925 /* If the user specifically requested variable tracking with tagging
1926 uninitialized variables, we need to turn on variable tracking.
1927 (We already determined above that variable tracking is feasible.) */
1928 if (flag_var_tracking_uninit)
1929 flag_var_tracking = 1;
1931 if (flag_var_tracking == AUTODETECT_VALUE)
1932 flag_var_tracking = optimize >= 1;
1934 if (flag_var_tracking_assignments == AUTODETECT_VALUE)
1935 flag_var_tracking_assignments = flag_var_tracking
1936 && !(flag_selective_scheduling || flag_selective_scheduling2);
1938 if (flag_var_tracking_assignments_toggle)
1939 flag_var_tracking_assignments = !flag_var_tracking_assignments;
1941 if (flag_var_tracking_assignments && !flag_var_tracking)
1942 flag_var_tracking = flag_var_tracking_assignments = -1;
1944 if (flag_var_tracking_assignments
1945 && (flag_selective_scheduling || flag_selective_scheduling2))
1946 warning (0, "var-tracking-assignments changes selective scheduling");
1948 if (flag_tree_cselim == AUTODETECT_VALUE)
1949 #ifdef HAVE_conditional_move
1950 flag_tree_cselim = 1;
1952 flag_tree_cselim = 0;
1955 /* If auxiliary info generation is desired, open the output file.
1956 This goes in the same directory as the source file--unlike
1957 all the other output files. */
1958 if (flag_gen_aux_info)
1960 aux_info_file = fopen (aux_info_file_name, "w");
1961 if (aux_info_file == 0)
1962 fatal_error ("can%'t open %s: %m", aux_info_file_name);
1965 if (! targetm.have_named_sections)
1967 if (flag_function_sections)
1969 warning (0, "-ffunction-sections not supported for this target");
1970 flag_function_sections = 0;
1972 if (flag_data_sections)
1974 warning (0, "-fdata-sections not supported for this target");
1975 flag_data_sections = 0;
1979 if (flag_function_sections && profile_flag)
1981 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
1982 flag_function_sections = 0;
1985 #ifndef HAVE_prefetch
1986 if (flag_prefetch_loop_arrays > 0)
1988 warning (0, "-fprefetch-loop-arrays not supported for this target");
1989 flag_prefetch_loop_arrays = 0;
1992 if (flag_prefetch_loop_arrays > 0 && !HAVE_prefetch)
1994 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1995 flag_prefetch_loop_arrays = 0;
1999 /* This combination of options isn't handled for i386 targets and doesn't
2000 make much sense anyway, so don't allow it. */
2001 if (flag_prefetch_loop_arrays > 0 && optimize_size)
2003 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
2004 flag_prefetch_loop_arrays = 0;
2007 /* The presence of IEEE signaling NaNs, implies all math can trap. */
2008 if (flag_signaling_nans)
2009 flag_trapping_math = 1;
2011 /* We cannot reassociate if we want traps or signed zeros. */
2012 if (flag_associative_math && (flag_trapping_math || flag_signed_zeros))
2014 warning (0, "-fassociative-math disabled; other options take precedence");
2015 flag_associative_math = 0;
2018 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
2019 if (flag_cx_limited_range)
2020 flag_complex_method = 0;
2022 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
2023 if (flag_cx_fortran_rules)
2024 flag_complex_method = 1;
2026 /* Targets must be able to place spill slots at lower addresses. If the
2027 target already uses a soft frame pointer, the transition is trivial. */
2028 if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
2030 warning (0, "-fstack-protector not supported for this target");
2031 flag_stack_protect = 0;
2033 if (!flag_stack_protect)
2034 warn_stack_protect = 0;
2036 /* ??? Unwind info is not correct around the CFG unless either a frame
2037 pointer is present or A_O_A is set. Fixing this requires rewriting
2038 unwind info generation to be aware of the CFG and propagating states
2040 if (flag_unwind_tables && !ACCUMULATE_OUTGOING_ARGS
2041 && flag_omit_frame_pointer)
2043 warning (0, "unwind tables currently require a frame pointer "
2045 flag_omit_frame_pointer = 0;
2048 /* Save the current optimization options. */
2049 optimization_default_node = build_optimization_node ();
2050 optimization_current_node = optimization_default_node;
2053 /* This function can be called multiple times to reinitialize the compiler
2054 back end when register classes or instruction sets have changed,
2055 before each function. */
2057 backend_init_target (void)
2059 /* Initialize alignment variables. */
2062 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
2063 to initialize reg_raw_mode[]. */
2066 /* This invokes target hooks to set fixed_reg[] etc, which is
2070 /* This depends on stack_pointer_rtx. */
2071 init_fake_stack_mems ();
2073 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
2075 init_alias_target ();
2077 /* Depends on HARD_FRAME_POINTER_REGNUM. */
2080 /* The following initialization functions need to generate rtl, so
2081 provide a dummy function context for them. */
2082 init_dummy_function_start ();
2084 /* rtx_cost is mode-dependent, so cached values need to be recomputed
2085 on a mode change. */
2088 /* We may need to recompute regno_save_code[] and regno_restore_code[]
2089 after a mode change as well. */
2090 caller_save_initialized_p = false;
2092 expand_dummy_function_end ();
2095 /* Initialize the compiler back end. This function is called only once,
2096 when starting the compiler. */
2103 init_inline_once ();
2104 init_varasm_once ();
2105 save_register_info ();
2107 /* Initialize the target-specific back end pieces. */
2109 backend_init_target ();
2112 /* Initialize excess precision settings. */
2114 init_excess_precision (void)
2116 /* Adjust excess precision handling based on the target options. If
2117 the front end cannot handle it, flag_excess_precision_cmdline
2118 will already have been set accordingly in the post_options
2120 gcc_assert (flag_excess_precision_cmdline != EXCESS_PRECISION_DEFAULT);
2121 flag_excess_precision = flag_excess_precision_cmdline;
2122 if (flag_unsafe_math_optimizations)
2123 flag_excess_precision = EXCESS_PRECISION_FAST;
2124 if (flag_excess_precision == EXCESS_PRECISION_STANDARD)
2126 int flt_eval_method = TARGET_FLT_EVAL_METHOD;
2127 switch (flt_eval_method)
2131 /* Either the target acts unpredictably (-1) or has all the
2132 operations required not to have excess precision (0). */
2133 flag_excess_precision = EXCESS_PRECISION_FAST;
2137 /* In these cases, predictable excess precision makes
2141 /* Any other implementation-defined FLT_EVAL_METHOD values
2142 require the compiler to handle the associated excess
2143 precision rules in excess_precision_type. */
2149 /* Initialize things that are both lang-dependent and target-dependent.
2150 This function can be called more than once if target parameters change. */
2152 lang_dependent_init_target (void)
2154 /* This determines excess precision settings. */
2155 init_excess_precision ();
2157 /* This creates various _DECL nodes, so needs to be called after the
2158 front end is initialized. It also depends on the HAVE_xxx macros
2159 generated from the target machine description. */
2162 /* The following initialization functions need to generate rtl, so
2163 provide a dummy function context for them. */
2164 init_dummy_function_start ();
2166 /* Do the target-specific parts of expr initialization. */
2167 init_expr_target ();
2169 /* Although the actions of these functions are language-independent,
2170 they use optabs, so we cannot call them from backend_init. */
2174 expand_dummy_function_end ();
2177 /* Language-dependent initialization. Returns nonzero on success. */
2179 lang_dependent_init (const char *name)
2181 location_t save_loc = input_location;
2182 if (dump_base_name == 0)
2183 dump_base_name = name && name[0] ? name : "gccdump";
2185 /* Other front-end initialization. */
2186 input_location = BUILTINS_LOCATION;
2187 if (lang_hooks.init () == 0)
2189 input_location = save_loc;
2191 init_asm_output (name);
2193 /* If stack usage information is desired, open the output file. */
2194 if (flag_stack_usage)
2195 stack_usage_file = open_auxiliary_file ("su");
2197 /* This creates various _DECL nodes, so needs to be called after the
2198 front end is initialized. */
2201 /* Do the target-specific parts of the initialization. */
2202 lang_dependent_init_target ();
2204 /* If dbx symbol table desired, initialize writing it and output the
2205 predefined types. */
2206 timevar_push (TV_SYMOUT);
2208 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
2209 if (dwarf2out_do_frame ())
2210 dwarf2out_frame_init ();
2213 /* Now we have the correct original filename, we can initialize
2215 (*debug_hooks->init) (name);
2217 timevar_pop (TV_SYMOUT);
2223 /* Reinitialize everything when target parameters, such as register usage,
2226 target_reinit (void)
2228 /* Reinitialize RTL backend. */
2229 backend_init_target ();
2231 /* Reinitialize lang-dependent parts. */
2232 lang_dependent_init_target ();
2236 dump_memory_report (bool final)
2238 ggc_print_statistics ();
2239 stringpool_statistics ();
2240 dump_tree_statistics ();
2241 dump_gimple_statistics ();
2242 dump_rtx_statistics ();
2243 dump_alloc_pool_statistics ();
2244 dump_bitmap_statistics ();
2245 dump_vec_loc_statistics ();
2246 dump_ggc_loc_statistics (final);
2247 dump_alias_stats (stderr);
2248 dump_pta_stats (stderr);
2251 /* Clean up: close opened files, etc. */
2256 /* Close the dump files. */
2257 if (flag_gen_aux_info)
2259 fclose (aux_info_file);
2261 unlink (aux_info_file_name);
2264 /* Close non-debugging input and output files. Take special care to note
2265 whether fclose returns an error, since the pages might still be on the
2266 buffer chain while the file is open. */
2270 if (ferror (asm_out_file) != 0)
2271 fatal_error ("error writing to %s: %m", asm_file_name);
2272 if (fclose (asm_out_file) != 0)
2273 fatal_error ("error closing %s: %m", asm_file_name);
2275 unlink_if_ordinary (asm_file_name);
2278 if (stack_usage_file)
2279 fclose (stack_usage_file);
2282 finish_optimization_passes ();
2287 dump_memory_report (true);
2289 /* Language-specific end of compilation actions. */
2290 lang_hooks.finish ();
2293 /* Initialize the compiler, and compile the input file. */
2297 /* Initialize timing first. The C front ends read the main file in
2298 the post_options hook, and C++ does file timings. */
2299 if (time_report || !quiet_flag || flag_detailed_statistics)
2301 timevar_start (TV_TOTAL);
2305 /* Don't do any more if an error has already occurred. */
2308 /* This must be run always, because it is needed to compute the FP
2309 predefined macros, such as __LDBL_MAX__, for targets using non
2310 default FP formats. */
2311 init_adjust_machine_modes ();
2313 /* Set up the back-end if requested. */
2317 /* Language-dependent initialization. Returns true on success. */
2318 if (lang_dependent_init (main_input_filename))
2324 /* Stop timing and print the times. */
2325 timevar_stop (TV_TOTAL);
2326 timevar_print (stderr);
2329 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2330 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2331 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2333 It is not safe to call this function more than once. */
2336 toplev_main (int argc, char **argv)
2338 expandargv (&argc, &argv);
2340 /* Initialization of GCC's environment, and diagnostics. */
2341 general_init (argv[0]);
2343 /* One-off initialization of options that does not need to be
2344 repeated when options are added for particular functions. */
2345 init_options_once ();
2347 /* Initialize global options structures; this must be repeated for
2348 each structure used for parsing options. */
2349 init_options_struct (&global_options, &global_options_set);
2350 lang_hooks.init_options_struct (&global_options);
2352 /* Convert the options to an array. */
2353 decode_cmdline_options_to_array_default_mask (argc,
2354 CONST_CAST2 (const char **,
2356 &save_decoded_options,
2357 &save_decoded_options_count);
2359 /* Perform language-specific options initialization. */
2360 lang_hooks.init_options (save_decoded_options_count, save_decoded_options);
2362 /* Parse the options and do minimal processing; basically just
2363 enough to default flags appropriately. */
2364 decode_options (&global_options, &global_options_set,
2365 save_decoded_options, save_decoded_options_count,
2366 UNKNOWN_LOCATION, global_dc);
2368 handle_common_deferred_options ();
2372 initialize_plugins ();
2375 print_version (stderr, "");
2378 print_plugins_help (stderr, "");
2380 /* Exit early if we can (e.g. -help). */
2381 if (!exit_after_options)
2384 if (warningcount || errorcount)
2385 print_ignored_options ();
2386 diagnostic_finish (global_dc);
2388 /* Invoke registered plugin callbacks if any. */
2389 invoke_plugin_callbacks (PLUGIN_FINISH, NULL);
2391 finalize_plugins ();
2393 return (FATAL_EXIT_CODE);
2395 return (SUCCESS_EXIT_CODE);