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 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
137 to optimize in process_options (). */
138 #define AUTODETECT_VALUE 2
140 /* Prefix for profile data files */
141 const char *profile_data_prefix;
143 /* Debug hooks - dependent upon command line options. */
145 const struct gcc_debug_hooks *debug_hooks;
147 /* Other flags saying which kinds of debugging dump have been requested. */
149 int rtl_dump_and_exit;
150 int flag_print_asm_name;
151 enum graph_dump_types graph_dump_format;
153 /* True if this is the lto front end. This is used to disable
154 gimple generation and lowering passes that are normally run on the
155 output of a front end. These passes must be bypassed for lto since
156 they have already been done before the gimple was written. */
158 bool in_lto_p = false;
160 /* The FUNCTION_DECL for the function currently being compiled,
161 or 0 if between functions. */
162 tree current_function_decl;
164 /* Set to the FUNC_BEGIN label of the current function, or NULL
166 const char * current_function_func_begin_label;
168 /* A random sequence of characters, unless overridden by user. */
169 static const char *flag_random_seed;
171 /* A local time stamp derived from the time of compilation. It will be
172 zero if the system cannot provide a time. It will be -1u, if the
173 user has specified a particular random seed. */
178 /* Generate code for GNU or NeXT Objective-C runtime environment. */
180 #ifdef NEXT_OBJC_RUNTIME
181 int flag_next_runtime = 1;
183 int flag_next_runtime = 0;
186 /* Nonzero means make permerror produce warnings instead of errors. */
188 int flag_permissive = 0;
190 /* -dA causes debug commentary information to be produced in
191 the generated assembly code (to make it more readable). This option
192 is generally only of use to those who actually need to read the
193 generated assembly code (perhaps while debugging the compiler itself).
194 Currently, this switch is only used by dwarfout.c; however, it is intended
195 to be a catchall for printing debug information in the assembler file. */
197 int flag_debug_asm = 0;
199 /* -dP causes the rtl to be emitted as a comment in assembly. */
201 int flag_dump_rtl_in_asm = 0;
203 /* When non-NULL, indicates that whenever space is allocated on the
204 stack, the resulting stack pointer must not pass this
205 address---that is, for stacks that grow downward, the stack pointer
206 must always be greater than or equal to this address; for stacks
207 that grow upward, the stack pointer must be less than this address.
208 At present, the rtx may be either a REG or a SYMBOL_REF, although
209 the support provided depends on the backend. */
212 /* Type of stack check. */
213 enum stack_check_type flag_stack_check = NO_STACK_CHECK;
215 /* True if the user has tagged the function with the 'section'
218 bool user_defined_section_attribute = false;
220 struct target_flag_state default_target_flag_state;
221 #if SWITCHABLE_TARGET
222 struct target_flag_state *this_target_flag_state = &default_target_flag_state;
224 #define this_target_flag_state (&default_target_flag_state)
229 const char *const string;
233 lang_independent_options;
235 /* The user symbol prefix after having resolved same. */
236 const char *user_label_prefix;
238 static const param_info lang_independent_params[] = {
239 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
240 { OPTION, DEFAULT, MIN, MAX, HELP },
241 #include "params.def"
243 { NULL, 0, 0, 0, NULL }
246 /* Output files for assembler code (real compiler output)
247 and debugging dumps. */
251 FILE *stack_usage_file = NULL;
252 FILE *dump_file = NULL;
253 const char *dump_file_name;
255 /* The current working directory of a translation. It's generally the
256 directory from which compilation was initiated, but a preprocessed
257 file may specify the original directory in which it was
260 static const char *src_pwd;
262 /* Initialize src_pwd with the given string, and return true. If it
263 was already initialized, return false. As a special case, it may
264 be called with a NULL argument to test whether src_pwd has NOT been
268 set_src_pwd (const char *pwd)
272 if (strcmp (src_pwd, pwd) == 0)
278 src_pwd = xstrdup (pwd);
282 /* Return the directory from which the translation unit was initiated,
283 in case set_src_pwd() was not called before to assign it a
299 /* Called when the start of a function definition is parsed,
300 this function prints on stderr the name of the function. */
302 announce_function (tree decl)
306 if (rtl_dump_and_exit)
307 fprintf (stderr, "%s ",
308 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl))));
310 fprintf (stderr, " %s",
311 identifier_to_locale (lang_hooks.decl_printable_name (decl, 2)));
313 pp_needs_newline (global_dc->printer) = true;
314 diagnostic_set_last_function (global_dc, (diagnostic_info *) NULL);
318 /* Initialize local_tick with the time of day, or -1 if
319 flag_random_seed is set. */
322 init_local_tick (void)
324 if (!flag_random_seed)
326 /* Get some more or less random data. */
327 #ifdef HAVE_GETTIMEOFDAY
331 gettimeofday (&tv, NULL);
332 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
336 time_t now = time (NULL);
338 if (now != (time_t)-1)
339 local_tick = (unsigned) now;
347 /* Set up a default flag_random_seed and local_tick, unless the user
348 already specified one. Must be called after init_local_tick. */
351 init_random_seed (void)
353 unsigned HOST_WIDE_INT value;
354 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
356 value = local_tick ^ getpid ();
358 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
359 flag_random_seed = random_seed;
362 /* Obtain the random_seed string. Unless NOINIT, initialize it if
363 it's not provided in the command line. */
366 get_random_seed (bool noinit)
368 if (!flag_random_seed && !noinit)
370 return flag_random_seed;
373 /* Modify the random_seed string to VAL. Return its previous
377 set_random_seed (const char *val)
379 const char *old = flag_random_seed;
380 flag_random_seed = val;
384 #if GCC_VERSION < 3004
386 /* The functions clz_hwi, ctz_hwi, ffs_hwi, floor_log2 and exact_log2
387 are defined as inline functions in toplev.h if GCC_VERSION >= 3004.
388 The definitions here are used for older versions of gcc. */
390 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
391 If X is 0, return -1. */
394 floor_log2 (unsigned HOST_WIDE_INT x)
401 if (HOST_BITS_PER_WIDE_INT > 64)
402 if (x >= (unsigned HOST_WIDE_INT) 1 << (t + 64))
404 if (HOST_BITS_PER_WIDE_INT > 32)
405 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 32))
407 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 16))
409 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 8))
411 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 4))
413 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 2))
415 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 1))
421 /* Return the logarithm of X, base 2, considering X unsigned,
422 if X is a power of 2. Otherwise, returns -1. */
425 exact_log2 (unsigned HOST_WIDE_INT x)
429 return floor_log2 (x);
432 /* Given X, an unsigned number, return the number of least significant bits
433 that are zero. When X == 0, the result is the word size. */
436 ctz_hwi (unsigned HOST_WIDE_INT x)
438 return x ? floor_log2 (x & -x) : HOST_BITS_PER_WIDE_INT;
441 /* Similarly for most significant bits. */
444 clz_hwi (unsigned HOST_WIDE_INT x)
446 return HOST_BITS_PER_WIDE_INT - 1 - floor_log2(x);
449 /* Similar to ctz_hwi, except that the least significant bit is numbered
450 starting from 1, and X == 0 yields 0. */
453 ffs_hwi (unsigned HOST_WIDE_INT x)
455 return 1 + floor_log2 (x & -x);
458 #endif /* GCC_VERSION < 3004 */
460 /* Handler for fatal signals, such as SIGSEGV. These are transformed
461 into ICE messages, which is much more user friendly. In case the
462 error printer crashes, reset the signal to prevent infinite recursion. */
465 crash_signal (int signo)
467 signal (signo, SIG_DFL);
469 /* If we crashed while processing an ASM statement, then be a little more
470 graceful. It's most likely the user's fault. */
471 if (this_is_asm_operands)
473 output_operand_lossage ("unrecoverable error");
474 exit (FATAL_EXIT_CODE);
477 internal_error ("%s", strsignal (signo));
480 /* Arrange to dump core on error. (The regular error message is still
481 printed first, except in the case of abort().) */
484 setup_core_dumping (void)
487 signal (SIGABRT, SIG_DFL);
489 #if defined(HAVE_SETRLIMIT)
492 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
493 fatal_error ("getting core file size maximum limit: %m");
494 rlim.rlim_cur = rlim.rlim_max;
495 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
496 fatal_error ("setting core file size limit to maximum: %m");
499 diagnostic_abort_on_error (global_dc);
503 /* Strip off a legitimate source ending from the input string NAME of
504 length LEN. Rather than having to know the names used by all of
505 our front ends, we strip off an ending of a period followed by
506 up to five characters. (Java uses ".class".) */
509 strip_off_ending (char *name, int len)
512 for (i = 2; i < 6 && len > i; i++)
514 if (name[len - i] == '.')
516 name[len - i] = '\0';
522 /* Output a quoted string. */
525 output_quoted_string (FILE *asm_file, const char *string)
527 #ifdef OUTPUT_QUOTED_STRING
528 OUTPUT_QUOTED_STRING (asm_file, string);
532 putc ('\"', asm_file);
533 while ((c = *string++) != 0)
537 if (c == '\"' || c == '\\')
538 putc ('\\', asm_file);
542 fprintf (asm_file, "\\%03o", (unsigned char) c);
544 putc ('\"', asm_file);
548 /* A subroutine of wrapup_global_declarations. We've come to the end of
549 the compilation unit. All deferred variables should be undeferred,
550 and all incomplete decls should be finalized. */
553 wrapup_global_declaration_1 (tree decl)
555 /* We're not deferring this any longer. Assignment is conditional to
556 avoid needlessly dirtying PCH pages. */
557 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl), TS_DECL_WITH_VIS)
558 && DECL_DEFER_OUTPUT (decl) != 0)
559 DECL_DEFER_OUTPUT (decl) = 0;
561 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
562 lang_hooks.finish_incomplete_decl (decl);
565 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
566 needs to be output. Return true if it is output. */
569 wrapup_global_declaration_2 (tree decl)
571 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
574 /* Don't write out static consts, unless we still need them.
576 We also keep static consts if not optimizing (for debugging),
577 unless the user specified -fno-keep-static-consts.
578 ??? They might be better written into the debug information.
579 This is possible when using DWARF.
581 A language processor that wants static constants to be always
582 written out (even if it is not used) is responsible for
583 calling rest_of_decl_compilation itself. E.g. the C front-end
584 calls rest_of_decl_compilation from finish_decl.
585 One motivation for this is that is conventional in some
586 environments to write things like:
587 static const char rcsid[] = "... version string ...";
588 intending to force the string to be in the executable.
590 A language processor that would prefer to have unneeded
591 static constants "optimized away" would just defer writing
592 them out until here. E.g. C++ does this, because static
593 constants are often defined in header files.
595 ??? A tempting alternative (for both C and C++) would be
596 to force a constant to be written if and only if it is
597 defined in a main file, as opposed to an include file. */
599 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
601 struct varpool_node *node;
603 node = varpool_get_node (decl);
605 if (!node && flag_ltrans)
607 else if (node && node->finalized)
609 else if (node && node->alias)
611 else if (!cgraph_global_info_ready
613 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
615 else if (node && node->needed)
617 else if (DECL_COMDAT (decl))
619 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
620 && (optimize || !flag_keep_static_consts
621 || DECL_ARTIFICIAL (decl)))
626 rest_of_decl_compilation (decl, 1, 1);
634 /* Do any final processing required for the declarations in VEC, of
635 which there are LEN. We write out inline functions and variables
636 that have been deferred until this point, but which are required.
637 Returns nonzero if anything was put out. */
640 wrapup_global_declarations (tree *vec, int len)
642 bool reconsider, output_something = false;
645 for (i = 0; i < len; i++)
646 wrapup_global_declaration_1 (vec[i]);
648 /* Now emit any global variables or functions that we have been
649 putting off. We need to loop in case one of the things emitted
650 here references another one which comes earlier in the list. */
654 for (i = 0; i < len; i++)
655 reconsider |= wrapup_global_declaration_2 (vec[i]);
657 output_something = true;
661 return output_something;
664 /* A subroutine of check_global_declarations. Issue appropriate warnings
665 for the global declaration DECL. */
668 check_global_declaration_1 (tree decl)
670 /* Warn about any function declared static but not defined. We don't
671 warn about variables, because many programs have static variables
672 that exist only to get some text into the object file. */
673 if (TREE_CODE (decl) == FUNCTION_DECL
674 && DECL_INITIAL (decl) == 0
675 && DECL_EXTERNAL (decl)
676 && ! DECL_ARTIFICIAL (decl)
677 && ! TREE_NO_WARNING (decl)
678 && ! TREE_PUBLIC (decl)
679 && (warn_unused_function
680 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
682 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
683 pedwarn (input_location, 0, "%q+F used but never defined", decl);
685 warning (OPT_Wunused_function, "%q+F declared %<static%> but never defined", decl);
686 /* This symbol is effectively an "extern" declaration now. */
687 TREE_PUBLIC (decl) = 1;
688 assemble_external (decl);
691 /* Warn about static fns or vars defined but not used. */
692 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
693 /* We don't warn about "static const" variables because the
694 "rcs_id" idiom uses that construction. */
695 || (warn_unused_variable
696 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
697 && ! DECL_IN_SYSTEM_HEADER (decl)
698 && ! TREE_USED (decl)
699 /* The TREE_USED bit for file-scope decls is kept in the identifier,
700 to handle multiple external decls in different scopes. */
701 && ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl)))
702 && ! DECL_EXTERNAL (decl)
703 && ! TREE_PUBLIC (decl)
704 /* A volatile variable might be used in some non-obvious way. */
705 && ! TREE_THIS_VOLATILE (decl)
706 /* Global register variables must be declared to reserve them. */
707 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
708 /* Otherwise, ask the language. */
709 && lang_hooks.decls.warn_unused_global (decl))
710 warning ((TREE_CODE (decl) == FUNCTION_DECL)
711 ? OPT_Wunused_function
712 : OPT_Wunused_variable,
713 "%q+D defined but not used", decl);
716 /* Issue appropriate warnings for the global declarations in VEC (of
717 which there are LEN). */
720 check_global_declarations (tree *vec, int len)
724 for (i = 0; i < len; i++)
725 check_global_declaration_1 (vec[i]);
728 /* Emit debugging information for all global declarations in VEC. */
731 emit_debug_global_declarations (tree *vec, int len)
735 /* Avoid confusing the debug information machinery when there are errors. */
739 timevar_push (TV_SYMOUT);
740 for (i = 0; i < len; i++)
741 debug_hooks->global_decl (vec[i]);
742 timevar_pop (TV_SYMOUT);
745 /* Warn about a use of an identifier which was marked deprecated. */
747 warn_deprecated_use (tree node, tree attr)
751 if (node == 0 || !warn_deprecated_decl)
757 attr = DECL_ATTRIBUTES (node);
758 else if (TYPE_P (node))
760 tree decl = TYPE_STUB_DECL (node);
762 attr = lookup_attribute ("deprecated",
763 TYPE_ATTRIBUTES (TREE_TYPE (decl)));
768 attr = lookup_attribute ("deprecated", attr);
771 msg = TREE_STRING_POINTER (TREE_VALUE (TREE_VALUE (attr)));
777 expanded_location xloc = expand_location (DECL_SOURCE_LOCATION (node));
779 warning (OPT_Wdeprecated_declarations,
780 "%qD is deprecated (declared at %s:%d): %s",
781 node, xloc.file, xloc.line, msg);
783 warning (OPT_Wdeprecated_declarations,
784 "%qD is deprecated (declared at %s:%d)",
785 node, xloc.file, xloc.line);
787 else if (TYPE_P (node))
789 tree what = NULL_TREE;
790 tree decl = TYPE_STUB_DECL (node);
792 if (TYPE_NAME (node))
794 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
795 what = TYPE_NAME (node);
796 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
797 && DECL_NAME (TYPE_NAME (node)))
798 what = DECL_NAME (TYPE_NAME (node));
803 expanded_location xloc
804 = expand_location (DECL_SOURCE_LOCATION (decl));
808 warning (OPT_Wdeprecated_declarations,
809 "%qE is deprecated (declared at %s:%d): %s",
810 what, xloc.file, xloc.line, msg);
812 warning (OPT_Wdeprecated_declarations,
813 "%qE is deprecated (declared at %s:%d)", what,
814 xloc.file, xloc.line);
819 warning (OPT_Wdeprecated_declarations,
820 "type is deprecated (declared at %s:%d): %s",
821 xloc.file, xloc.line, msg);
823 warning (OPT_Wdeprecated_declarations,
824 "type is deprecated (declared at %s:%d)",
825 xloc.file, xloc.line);
833 warning (OPT_Wdeprecated_declarations, "%qE is deprecated: %s",
836 warning (OPT_Wdeprecated_declarations, "%qE is deprecated", what);
841 warning (OPT_Wdeprecated_declarations, "type is deprecated: %s",
844 warning (OPT_Wdeprecated_declarations, "type is deprecated");
850 /* Compile an entire translation unit. Write a file of assembly
851 output and various debugging dumps. */
856 /* Initialize yet another pass. */
858 ggc_protect_identifiers = true;
861 init_final (main_input_filename);
862 coverage_init (aux_base_name);
864 invoke_plugin_callbacks (PLUGIN_START_UNIT, NULL);
866 timevar_push (TV_PARSE);
868 /* Call the parser, which parses the entire file (calling
869 rest_of_compilation for each function). */
870 lang_hooks.parse_file ();
872 /* Compilation is now finished except for writing
873 what's left of the symbol table output. */
874 timevar_pop (TV_PARSE);
876 if (flag_syntax_only || flag_wpa)
879 ggc_protect_identifiers = false;
881 /* This must also call cgraph_finalize_compilation_unit. */
882 lang_hooks.decls.final_write_globals ();
887 varpool_assemble_pending_decls ();
890 /* Likewise for mudflap static object registrations. */
892 mudflap_finish_file ();
894 output_shared_constant_pool ();
895 output_object_blocks ();
897 /* Write out any pending weak symbol declarations. */
900 /* This must be at the end before unwind and debug info.
901 Some target ports emit PIC setup thunks here. */
902 targetm.asm_out.code_end ();
904 /* Do dbx symbols. */
905 timevar_push (TV_SYMOUT);
907 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
908 if (dwarf2out_do_frame ())
909 dwarf2out_frame_finish ();
912 (*debug_hooks->finish) (main_input_filename);
913 timevar_pop (TV_SYMOUT);
915 /* Output some stuff at end of file if nec. */
917 dw2_output_indirect_constants ();
919 /* Flush any pending external directives. */
920 process_pending_assemble_externals ();
922 /* Emit LTO marker if LTO info has been previously emitted. This is
923 used by collect2 to determine whether an object file contains IL.
924 We used to emit an undefined reference here, but this produces
925 link errors if an object file with IL is stored into a shared
926 library without invoking lto1. */
927 if (flag_generate_lto)
929 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
930 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
932 (unsigned HOST_WIDE_INT) 1, 8);
933 #elif defined ASM_OUTPUT_ALIGNED_COMMON
934 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_v1",
935 (unsigned HOST_WIDE_INT) 1, 8);
937 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_v1",
938 (unsigned HOST_WIDE_INT) 1,
939 (unsigned HOST_WIDE_INT) 1);
943 /* Attach a special .ident directive to the end of the file to identify
944 the version of GCC which compiled this code. The format of the .ident
945 string is patterned after the ones produced by native SVR4 compilers. */
949 const char *pkg_version = "(GNU) ";
951 if (strcmp ("(GCC) ", pkgversion_string))
952 pkg_version = pkgversion_string;
953 fprintf (asm_out_file, "%s\"GCC: %s%s\"\n",
954 IDENT_ASM_OP, pkg_version, version_string);
958 /* Invoke registered plugin callbacks. */
959 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT, NULL);
961 /* This must be at the end. Some target ports emit end of file directives
962 into the assembly file here, and hence we can not output anything to the
963 assembly file after this point. */
964 targetm.asm_out.file_end ();
967 /* Parse a -d... command line switch. */
970 decode_d_option (const char *arg)
981 flag_print_asm_name = 1;
984 flag_dump_rtl_in_asm = 1;
985 flag_print_asm_name = 1;
988 graph_dump_format = vcg;
991 rtl_dump_and_exit = 1;
993 case 'D': /* These are handled by the preprocessor. */
1000 setup_core_dumping();
1003 enable_rtl_dump_file ();
1007 warning (0, "unrecognized gcc debugging option: %c", c);
1012 /* Indexed by enum debug_info_type. */
1013 const char *const debug_type_names[] =
1015 "none", "stabs", "coff", "dwarf-2", "xcoff", "vms"
1018 /* Print version information to FILE.
1019 Each line begins with INDENT (for the case where FILE is the
1020 assembler output file). */
1023 print_version (FILE *file, const char *indent)
1025 static const char fmt1[] =
1027 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
1029 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
1032 static const char fmt2[] =
1033 N_("GMP version %s, MPFR version %s, MPC version %s\n");
1034 static const char fmt3[] =
1035 N_("%s%swarning: %s header version %s differs from library version %s.\n");
1036 static const char fmt4[] =
1037 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
1039 #define __VERSION__ "[?]"
1042 file == stderr ? _(fmt1) : fmt1,
1043 indent, *indent != 0 ? " " : "",
1044 lang_hooks.name, pkgversion_string, version_string, TARGET_NAME,
1045 indent, __VERSION__);
1047 /* We need to stringify the GMP macro values. Ugh, gmp_version has
1048 two string formats, "i.j.k" and "i.j" when k is zero. As of
1049 gmp-4.3.0, GMP always uses the 3 number format. */
1050 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
1051 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3(X)
1052 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
1053 #define GCC_GMP_VERSION \
1054 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
1055 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
1056 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
1057 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR)
1059 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
1060 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) "." \
1061 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_PATCHLEVEL)
1064 file == stderr ? _(fmt2) : fmt2,
1065 GCC_GMP_STRINGIFY_VERSION, MPFR_VERSION_STRING, MPC_VERSION_STRING);
1066 if (strcmp (GCC_GMP_STRINGIFY_VERSION, gmp_version))
1068 file == stderr ? _(fmt3) : fmt3,
1069 indent, *indent != 0 ? " " : "",
1070 "GMP", GCC_GMP_STRINGIFY_VERSION, gmp_version);
1071 if (strcmp (MPFR_VERSION_STRING, mpfr_get_version ()))
1073 file == stderr ? _(fmt3) : fmt3,
1074 indent, *indent != 0 ? " " : "",
1075 "MPFR", MPFR_VERSION_STRING, mpfr_get_version ());
1076 if (strcmp (MPC_VERSION_STRING, mpc_get_version ()))
1078 file == stderr ? _(fmt3) : fmt3,
1079 indent, *indent != 0 ? " " : "",
1080 "MPC", MPC_VERSION_STRING, mpc_get_version ());
1082 file == stderr ? _(fmt4) : fmt4,
1083 indent, *indent != 0 ? " " : "",
1084 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
1086 print_plugins_versions (file, indent);
1089 #ifdef ASM_COMMENT_START
1091 print_to_asm_out_file (print_switch_type type, const char * text)
1093 bool prepend_sep = true;
1097 case SWITCH_TYPE_LINE_END:
1098 putc ('\n', asm_out_file);
1101 case SWITCH_TYPE_LINE_START:
1102 fputs (ASM_COMMENT_START, asm_out_file);
1103 return strlen (ASM_COMMENT_START);
1105 case SWITCH_TYPE_DESCRIPTIVE:
1106 if (ASM_COMMENT_START[0] == 0)
1107 prepend_sep = false;
1109 case SWITCH_TYPE_PASSED:
1110 case SWITCH_TYPE_ENABLED:
1112 fputc (' ', asm_out_file);
1113 fputs (text, asm_out_file);
1114 /* No need to return the length here as
1115 print_single_switch has already done it. */
1125 print_to_stderr (print_switch_type type, const char * text)
1129 case SWITCH_TYPE_LINE_END:
1130 putc ('\n', stderr);
1133 case SWITCH_TYPE_LINE_START:
1136 case SWITCH_TYPE_PASSED:
1137 case SWITCH_TYPE_ENABLED:
1138 fputc (' ', stderr);
1141 case SWITCH_TYPE_DESCRIPTIVE:
1142 fputs (text, stderr);
1143 /* No need to return the length here as
1144 print_single_switch has already done it. */
1152 /* Print an option value and return the adjusted position in the line.
1153 ??? print_fn doesn't handle errors, eg disk full; presumably other
1154 code will catch a disk full though. */
1157 print_single_switch (print_switch_fn_type print_fn,
1159 print_switch_type type,
1162 /* The ultrix fprintf returns 0 on success, so compute the result
1163 we want here since we need it for the following test. The +1
1164 is for the separator character that will probably be emitted. */
1165 int len = strlen (text) + 1;
1168 && pos + len > MAX_LINE)
1170 print_fn (SWITCH_TYPE_LINE_END, NULL);
1175 pos += print_fn (SWITCH_TYPE_LINE_START, NULL);
1177 print_fn (type, text);
1181 /* Print active target switches using PRINT_FN.
1182 POS is the current cursor position and MAX is the size of a "line".
1183 Each line begins with INDENT and ends with TERM.
1184 Each switch is separated from the next by SEP. */
1187 print_switch_values (print_switch_fn_type print_fn)
1192 /* Fill in the -frandom-seed option, if the user didn't pass it, so
1193 that it can be printed below. This helps reproducibility. */
1194 if (!flag_random_seed)
1195 init_random_seed ();
1197 /* Print the options as passed. */
1198 pos = print_single_switch (print_fn, pos,
1199 SWITCH_TYPE_DESCRIPTIVE, _("options passed: "));
1201 for (j = 1; j < save_decoded_options_count; j++)
1203 switch (save_decoded_options[j].opt_index)
1216 pos = print_single_switch (print_fn, pos, SWITCH_TYPE_PASSED,
1217 save_decoded_options[j].orig_option_with_args_text);
1221 print_fn (SWITCH_TYPE_LINE_END, NULL);
1223 /* Print the -f and -m options that have been enabled.
1224 We don't handle language specific options but printing argv
1226 pos = print_single_switch (print_fn, 0,
1227 SWITCH_TYPE_DESCRIPTIVE, _("options enabled: "));
1229 for (j = 0; j < cl_options_count; j++)
1230 if ((cl_options[j].flags & CL_REPORT)
1231 && option_enabled (j, &global_options) > 0)
1232 pos = print_single_switch (print_fn, pos,
1233 SWITCH_TYPE_ENABLED, cl_options[j].opt_text);
1235 print_fn (SWITCH_TYPE_LINE_END, NULL);
1238 /* Open assembly code output file. Do this even if -fsyntax-only is
1239 on, because then the driver will have provided the name of a
1240 temporary file or bit bucket for us. NAME is the file specified on
1241 the command line, possibly NULL. */
1243 init_asm_output (const char *name)
1245 if (name == NULL && asm_file_name == 0)
1246 asm_out_file = stdout;
1249 if (asm_file_name == 0)
1251 int len = strlen (dump_base_name);
1252 char *dumpname = XNEWVEC (char, len + 6);
1254 memcpy (dumpname, dump_base_name, len + 1);
1255 strip_off_ending (dumpname, len);
1256 strcat (dumpname, ".s");
1257 asm_file_name = dumpname;
1259 if (!strcmp (asm_file_name, "-"))
1260 asm_out_file = stdout;
1262 asm_out_file = fopen (asm_file_name, "w+b");
1263 if (asm_out_file == 0)
1264 fatal_error ("can%'t open %s for writing: %m", asm_file_name);
1267 if (!flag_syntax_only)
1269 targetm.asm_out.file_start ();
1271 if (flag_record_gcc_switches)
1273 if (targetm.asm_out.record_gcc_switches)
1275 /* Let the target know that we are about to start recording. */
1276 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
1278 /* Now record the switches. */
1279 print_switch_values (targetm.asm_out.record_gcc_switches);
1280 /* Let the target know that the recording is over. */
1281 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
1285 inform (input_location, "-frecord-gcc-switches is not supported by the current target");
1288 #ifdef ASM_COMMENT_START
1289 if (flag_verbose_asm)
1291 /* Print the list of switches in effect
1292 into the assembler file as comments. */
1293 print_version (asm_out_file, ASM_COMMENT_START);
1294 print_switch_values (print_to_asm_out_file);
1295 putc ('\n', asm_out_file);
1301 /* Return true if the state of option OPTION should be stored in PCH files
1302 and checked by default_pch_valid_p. Store the option's current state
1306 option_affects_pch_p (int option, struct cl_option_state *state)
1308 if ((cl_options[option].flags & CL_TARGET) == 0)
1310 if (option_flag_var (option, &global_options) == &target_flags)
1311 if (targetm.check_pch_target_flags)
1313 return get_option_state (&global_options, option, state);
1316 /* Default version of get_pch_validity.
1317 By default, every flag difference is fatal; that will be mostly right for
1318 most targets, but completely right for very few. */
1321 default_get_pch_validity (size_t *sz)
1323 struct cl_option_state state;
1328 if (targetm.check_pch_target_flags)
1329 *sz += sizeof (target_flags);
1330 for (i = 0; i < cl_options_count; i++)
1331 if (option_affects_pch_p (i, &state))
1334 result = r = XNEWVEC (char, *sz);
1338 if (targetm.check_pch_target_flags)
1340 memcpy (r, &target_flags, sizeof (target_flags));
1341 r += sizeof (target_flags);
1344 for (i = 0; i < cl_options_count; i++)
1345 if (option_affects_pch_p (i, &state))
1347 memcpy (r, state.data, state.size);
1354 /* Return a message which says that a PCH file was created with a different
1355 setting of OPTION. */
1358 pch_option_mismatch (const char *option)
1362 asprintf (&r, _("created and used with differing settings of '%s'"), option);
1364 return _("out of memory");
1368 /* Default version of pch_valid_p. */
1371 default_pch_valid_p (const void *data_p, size_t len)
1373 struct cl_option_state state;
1374 const char *data = (const char *)data_p;
1377 /* -fpic and -fpie also usually make a PCH invalid. */
1378 if (data[0] != flag_pic)
1379 return _("created and used with different settings of -fpic");
1380 if (data[1] != flag_pie)
1381 return _("created and used with different settings of -fpie");
1384 /* Check target_flags. */
1385 if (targetm.check_pch_target_flags)
1390 memcpy (&tf, data, sizeof (target_flags));
1391 data += sizeof (target_flags);
1392 len -= sizeof (target_flags);
1393 r = targetm.check_pch_target_flags (tf);
1398 for (i = 0; i < cl_options_count; i++)
1399 if (option_affects_pch_p (i, &state))
1401 if (memcmp (data, state.data, state.size) != 0)
1402 return pch_option_mismatch (cl_options[i].opt_text);
1410 /* Default tree printer. Handles declarations only. */
1412 default_tree_printer (pretty_printer *pp, text_info *text, const char *spec,
1413 int precision, bool wide, bool set_locus, bool hash)
1417 /* FUTURE: %+x should set the locus. */
1418 if (precision != 0 || wide || hash)
1424 t = va_arg (*text->args_ptr, tree);
1425 if (TREE_CODE (t) == IDENTIFIER_NODE)
1427 pp_identifier (pp, IDENTIFIER_POINTER (t));
1433 t = va_arg (*text->args_ptr, tree);
1434 if (DECL_DEBUG_EXPR_IS_FROM (t) && DECL_DEBUG_EXPR (t))
1435 t = DECL_DEBUG_EXPR (t);
1440 t = va_arg (*text->args_ptr, tree);
1444 percent_K_format (text);
1451 if (set_locus && text->locus)
1452 *text->locus = DECL_SOURCE_LOCATION (t);
1456 const char *n = DECL_NAME (t)
1457 ? identifier_to_locale (lang_hooks.decl_printable_name (t, 2))
1462 dump_generic_node (pp, t, 0, TDF_DIAGNOSTIC, 0);
1467 /* A helper function; used as the reallocator function for cpp's line
1470 realloc_for_line_map (void *ptr, size_t len)
1472 return GGC_RESIZEVAR (void, ptr, len);
1475 /* A helper function: used as the allocator function for
1476 identifier_to_locale. */
1478 alloc_for_identifier_to_locale (size_t len)
1480 return ggc_alloc_atomic (len);
1483 /* Output stack usage information. */
1485 output_stack_usage (void)
1487 static bool warning_issued = false;
1488 enum stack_usage_kind_type { STATIC = 0, DYNAMIC, DYNAMIC_BOUNDED };
1489 const char *stack_usage_kind_str[] = {
1494 HOST_WIDE_INT stack_usage = current_function_static_stack_size;
1495 enum stack_usage_kind_type stack_usage_kind;
1496 expanded_location loc;
1497 const char *raw_id, *id;
1499 if (stack_usage < 0)
1501 if (!warning_issued)
1503 warning (0, "-fstack-usage not supported for this target");
1504 warning_issued = true;
1509 stack_usage_kind = STATIC;
1511 /* Add the maximum amount of space pushed onto the stack. */
1512 if (current_function_pushed_stack_size > 0)
1514 stack_usage += current_function_pushed_stack_size;
1515 stack_usage_kind = DYNAMIC_BOUNDED;
1518 /* Now on to the tricky part: dynamic stack allocation. */
1519 if (current_function_allocates_dynamic_stack_space)
1521 if (current_function_has_unbounded_dynamic_stack_size)
1522 stack_usage_kind = DYNAMIC;
1524 stack_usage_kind = DYNAMIC_BOUNDED;
1526 /* Add the size even in the unbounded case, this can't hurt. */
1527 stack_usage += current_function_dynamic_stack_size;
1530 loc = expand_location (DECL_SOURCE_LOCATION (current_function_decl));
1532 /* Strip the scope prefix if any. */
1533 raw_id = lang_hooks.decl_printable_name (current_function_decl, 2);
1534 id = strrchr (raw_id, '.');
1540 fprintf (stack_usage_file,
1541 "%s:%d:%d:%s\t"HOST_WIDE_INT_PRINT_DEC"\t%s\n",
1542 lbasename (loc.file),
1547 stack_usage_kind_str[stack_usage_kind]);
1550 /* Open an auxiliary output file. */
1552 open_auxiliary_file (const char *ext)
1557 filename = concat (aux_base_name, ".", ext, NULL);
1558 file = fopen (filename, "w");
1560 fatal_error ("can%'t open %s for writing: %m", filename);
1565 /* Initialization of the front end environment, before command line
1566 options are parsed. Signal handlers, internationalization etc.
1567 ARGV0 is main's argv[0]. */
1569 general_init (const char *argv0)
1573 p = argv0 + strlen (argv0);
1574 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1578 xmalloc_set_program_name (progname);
1582 /* Unlock the stdio streams. */
1583 unlock_std_streams ();
1585 gcc_init_libintl ();
1587 identifier_to_locale_alloc = alloc_for_identifier_to_locale;
1588 identifier_to_locale_free = ggc_free;
1590 /* Initialize the diagnostics reporting machinery, so option parsing
1591 can give warnings and errors. */
1592 diagnostic_initialize (global_dc, N_OPTS);
1593 diagnostic_starter (global_dc) = default_tree_diagnostic_starter;
1594 /* Set a default printer. Language specific initializations will
1595 override it later. */
1596 pp_format_decoder (global_dc->printer) = &default_tree_printer;
1597 global_dc->show_option_requested
1598 = global_options_init.x_flag_diagnostics_show_option;
1599 global_dc->show_column
1600 = global_options_init.x_flag_show_column;
1601 global_dc->internal_error = plugins_internal_error_function;
1602 global_dc->option_enabled = option_enabled;
1603 global_dc->option_state = &global_options;
1604 global_dc->option_name = option_name;
1606 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1608 signal (SIGSEGV, crash_signal);
1611 signal (SIGILL, crash_signal);
1614 signal (SIGBUS, crash_signal);
1617 signal (SIGABRT, crash_signal);
1619 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1620 signal (SIGIOT, crash_signal);
1623 signal (SIGFPE, crash_signal);
1626 /* Other host-specific signal setup. */
1627 (*host_hooks.extra_signals)();
1629 /* Initialize the garbage-collector, string pools and tree type hash
1633 line_table = ggc_alloc_line_maps ();
1634 linemap_init (line_table);
1635 line_table->reallocator = realloc_for_line_map;
1638 /* Initialize register usage now so switches may override. */
1641 /* Register the language-independent parameters. */
1642 add_params (lang_independent_params, LAST_PARAM);
1643 targetm.target_option.default_params ();
1645 /* This must be done after add_params but before argument processing. */
1646 init_ggc_heuristics();
1647 init_optimization_passes ();
1648 statistics_early_init ();
1652 /* Return true if the current target supports -fsection-anchors. */
1655 target_supports_section_anchors_p (void)
1657 if (targetm.min_anchor_offset == 0 && targetm.max_anchor_offset == 0)
1660 if (targetm.asm_out.output_anchor == NULL)
1666 /* Default the align_* variables to 1 if they're still unset, and
1667 set up the align_*_log variables. */
1669 init_alignments (void)
1671 if (align_loops <= 0)
1673 if (align_loops_max_skip > align_loops)
1674 align_loops_max_skip = align_loops - 1;
1675 align_loops_log = floor_log2 (align_loops * 2 - 1);
1676 if (align_jumps <= 0)
1678 if (align_jumps_max_skip > align_jumps)
1679 align_jumps_max_skip = align_jumps - 1;
1680 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1681 if (align_labels <= 0)
1683 align_labels_log = floor_log2 (align_labels * 2 - 1);
1684 if (align_labels_max_skip > align_labels)
1685 align_labels_max_skip = align_labels - 1;
1686 if (align_functions <= 0)
1687 align_functions = 1;
1688 align_functions_log = floor_log2 (align_functions * 2 - 1);
1691 /* Process the options that have been parsed. */
1693 process_options (void)
1695 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1696 This can happen with incorrect pre-processed input. */
1697 debug_hooks = &do_nothing_debug_hooks;
1699 /* This replaces set_Wunused. */
1700 if (warn_unused_function == -1)
1701 warn_unused_function = warn_unused;
1702 if (warn_unused_label == -1)
1703 warn_unused_label = warn_unused;
1704 /* Wunused-parameter is enabled if both -Wunused -Wextra are enabled. */
1705 if (warn_unused_parameter == -1)
1706 warn_unused_parameter = (warn_unused && extra_warnings);
1707 if (warn_unused_variable == -1)
1708 warn_unused_variable = warn_unused;
1709 /* Wunused-but-set-parameter is enabled if both -Wunused -Wextra are
1711 if (warn_unused_but_set_parameter == -1)
1712 warn_unused_but_set_parameter = (warn_unused && extra_warnings);
1713 if (warn_unused_but_set_variable == -1)
1714 warn_unused_but_set_variable = warn_unused;
1715 if (warn_unused_value == -1)
1716 warn_unused_value = warn_unused;
1718 /* This replaces set_Wextra. */
1719 if (warn_uninitialized == -1)
1720 warn_uninitialized = extra_warnings;
1722 /* Allow the front end to perform consistency checks and do further
1723 initialization based on the command line options. This hook also
1724 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1725 so we can correctly initialize debug output. */
1726 no_backend = lang_hooks.post_options (&main_input_filename);
1728 /* Some machines may reject certain combinations of options. */
1729 targetm.target_option.override ();
1731 /* Avoid any informative notes in the second run of -fcompare-debug. */
1732 if (flag_compare_debug)
1733 diagnostic_inhibit_notes (global_dc);
1735 if (flag_section_anchors && !target_supports_section_anchors_p ())
1737 warning (OPT_fsection_anchors,
1738 "this target does not support %qs", "-fsection-anchors");
1739 flag_section_anchors = 0;
1742 if (flag_short_enums == 2)
1743 flag_short_enums = targetm.default_short_enums ();
1745 /* Set aux_base_name if not already set. */
1748 else if (main_input_filename)
1750 char *name = xstrdup (lbasename (main_input_filename));
1752 strip_off_ending (name, strlen (name));
1753 aux_base_name = name;
1756 aux_base_name = "gccaux";
1761 || flag_loop_interchange
1762 || flag_loop_strip_mine
1763 || flag_graphite_identity
1764 || flag_loop_parallelize_all)
1765 sorry ("Graphite loop optimizations cannot be used");
1768 /* Unrolling all loops implies that standard loop unrolling must also
1770 if (flag_unroll_all_loops)
1771 flag_unroll_loops = 1;
1773 /* web and rename-registers help when run after loop unrolling. */
1774 if (flag_web == AUTODETECT_VALUE)
1775 flag_web = flag_unroll_loops || flag_peel_loops;
1777 if (flag_rename_registers == AUTODETECT_VALUE)
1778 flag_rename_registers = flag_unroll_loops || flag_peel_loops;
1780 if (flag_non_call_exceptions)
1781 flag_asynchronous_unwind_tables = 1;
1782 if (flag_asynchronous_unwind_tables)
1783 flag_unwind_tables = 1;
1785 if (flag_value_profile_transformations)
1786 flag_profile_values = 1;
1788 /* Warn about options that are not supported on this machine. */
1789 #ifndef INSN_SCHEDULING
1790 if (flag_schedule_insns || flag_schedule_insns_after_reload)
1791 warning (0, "instruction scheduling not supported on this target machine");
1794 if (flag_delayed_branch)
1795 warning (0, "this target machine does not have delayed branches");
1798 user_label_prefix = USER_LABEL_PREFIX;
1799 if (flag_leading_underscore != -1)
1801 /* If the default prefix is more complicated than "" or "_",
1802 issue a warning and ignore this option. */
1803 if (user_label_prefix[0] == 0 ||
1804 (user_label_prefix[0] == '_' && user_label_prefix[1] == 0))
1806 user_label_prefix = flag_leading_underscore ? "_" : "";
1809 warning (0, "-f%sleading-underscore not supported on this target machine",
1810 flag_leading_underscore ? "" : "no-");
1813 /* If we are in verbose mode, write out the version and maybe all the
1814 option flags in use. */
1817 print_version (stderr, "");
1819 print_switch_values (print_to_stderr);
1822 if (flag_syntax_only)
1824 write_symbols = NO_DEBUG;
1830 if (debug_info_level == DINFO_LEVEL_NONE)
1832 debug_info_level = DINFO_LEVEL_NORMAL;
1834 if (write_symbols == NO_DEBUG)
1835 write_symbols = PREFERRED_DEBUGGING_TYPE;
1838 debug_info_level = DINFO_LEVEL_NONE;
1841 if (flag_dump_final_insns && !flag_syntax_only && !no_backend)
1843 FILE *final_output = fopen (flag_dump_final_insns, "w");
1846 error ("could not open final insn dump file %qs: %m",
1847 flag_dump_final_insns);
1848 flag_dump_final_insns = NULL;
1850 else if (fclose (final_output))
1852 error ("could not close zeroed insn dump file %qs: %m",
1853 flag_dump_final_insns);
1854 flag_dump_final_insns = NULL;
1858 /* Unless over-ridden for the target, assume that all DWARF levels
1859 may be emitted, if DWARF2_DEBUG is selected. */
1860 if (dwarf_strict < 0)
1863 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1865 if (debug_info_level == DINFO_LEVEL_NONE)
1866 write_symbols = NO_DEBUG;
1868 if (write_symbols == NO_DEBUG)
1870 #if defined(DBX_DEBUGGING_INFO)
1871 else if (write_symbols == DBX_DEBUG)
1872 debug_hooks = &dbx_debug_hooks;
1874 #if defined(XCOFF_DEBUGGING_INFO)
1875 else if (write_symbols == XCOFF_DEBUG)
1876 debug_hooks = &xcoff_debug_hooks;
1878 #ifdef SDB_DEBUGGING_INFO
1879 else if (write_symbols == SDB_DEBUG)
1880 debug_hooks = &sdb_debug_hooks;
1882 #ifdef DWARF2_DEBUGGING_INFO
1883 else if (write_symbols == DWARF2_DEBUG)
1884 debug_hooks = &dwarf2_debug_hooks;
1886 #ifdef VMS_DEBUGGING_INFO
1887 else if (write_symbols == VMS_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
1888 debug_hooks = &vmsdbg_debug_hooks;
1891 error ("target system does not support the \"%s\" debug format",
1892 debug_type_names[write_symbols]);
1894 /* We know which debug output will be used so we can set flag_var_tracking
1895 and flag_var_tracking_uninit if the user has not specified them. */
1896 if (debug_info_level < DINFO_LEVEL_NORMAL
1897 || debug_hooks->var_location == do_nothing_debug_hooks.var_location)
1899 if (flag_var_tracking == 1
1900 || flag_var_tracking_uninit == 1)
1902 if (debug_info_level < DINFO_LEVEL_NORMAL)
1903 warning (0, "variable tracking requested, but useless unless "
1904 "producing debug info");
1906 warning (0, "variable tracking requested, but not supported "
1907 "by this debug format");
1909 flag_var_tracking = 0;
1910 flag_var_tracking_uninit = 0;
1913 /* The debug hooks are used to implement -fdump-go-spec because it
1914 gives a simple and stable API for all the information we need to
1916 if (flag_dump_go_spec != NULL)
1917 debug_hooks = dump_go_spec_init (flag_dump_go_spec, debug_hooks);
1919 /* If the user specifically requested variable tracking with tagging
1920 uninitialized variables, we need to turn on variable tracking.
1921 (We already determined above that variable tracking is feasible.) */
1922 if (flag_var_tracking_uninit)
1923 flag_var_tracking = 1;
1925 if (flag_var_tracking == AUTODETECT_VALUE)
1926 flag_var_tracking = optimize >= 1;
1928 if (flag_var_tracking_assignments == AUTODETECT_VALUE)
1929 flag_var_tracking_assignments = flag_var_tracking
1930 && !(flag_selective_scheduling || flag_selective_scheduling2);
1932 if (flag_var_tracking_assignments_toggle)
1933 flag_var_tracking_assignments = !flag_var_tracking_assignments;
1935 if (flag_var_tracking_assignments && !flag_var_tracking)
1936 flag_var_tracking = flag_var_tracking_assignments = -1;
1938 if (flag_var_tracking_assignments
1939 && (flag_selective_scheduling || flag_selective_scheduling2))
1940 warning (0, "var-tracking-assignments changes selective scheduling");
1942 if (flag_tree_cselim == AUTODETECT_VALUE)
1943 #ifdef HAVE_conditional_move
1944 flag_tree_cselim = 1;
1946 flag_tree_cselim = 0;
1949 /* If auxiliary info generation is desired, open the output file.
1950 This goes in the same directory as the source file--unlike
1951 all the other output files. */
1952 if (flag_gen_aux_info)
1954 aux_info_file = fopen (aux_info_file_name, "w");
1955 if (aux_info_file == 0)
1956 fatal_error ("can%'t open %s: %m", aux_info_file_name);
1959 if (! targetm.have_named_sections)
1961 if (flag_function_sections)
1963 warning (0, "-ffunction-sections not supported for this target");
1964 flag_function_sections = 0;
1966 if (flag_data_sections)
1968 warning (0, "-fdata-sections not supported for this target");
1969 flag_data_sections = 0;
1973 if (flag_function_sections && profile_flag)
1975 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
1976 flag_function_sections = 0;
1979 #ifndef HAVE_prefetch
1980 if (flag_prefetch_loop_arrays > 0)
1982 warning (0, "-fprefetch-loop-arrays not supported for this target");
1983 flag_prefetch_loop_arrays = 0;
1986 if (flag_prefetch_loop_arrays > 0 && !HAVE_prefetch)
1988 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1989 flag_prefetch_loop_arrays = 0;
1993 /* This combination of options isn't handled for i386 targets and doesn't
1994 make much sense anyway, so don't allow it. */
1995 if (flag_prefetch_loop_arrays > 0 && optimize_size)
1997 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1998 flag_prefetch_loop_arrays = 0;
2001 /* The presence of IEEE signaling NaNs, implies all math can trap. */
2002 if (flag_signaling_nans)
2003 flag_trapping_math = 1;
2005 /* We cannot reassociate if we want traps or signed zeros. */
2006 if (flag_associative_math && (flag_trapping_math || flag_signed_zeros))
2008 warning (0, "-fassociative-math disabled; other options take precedence");
2009 flag_associative_math = 0;
2012 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
2013 if (flag_cx_limited_range)
2014 flag_complex_method = 0;
2016 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
2017 if (flag_cx_fortran_rules)
2018 flag_complex_method = 1;
2020 /* Targets must be able to place spill slots at lower addresses. If the
2021 target already uses a soft frame pointer, the transition is trivial. */
2022 if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
2024 warning (0, "-fstack-protector not supported for this target");
2025 flag_stack_protect = 0;
2027 if (!flag_stack_protect)
2028 warn_stack_protect = 0;
2030 /* ??? Unwind info is not correct around the CFG unless either a frame
2031 pointer is present or A_O_A is set. Fixing this requires rewriting
2032 unwind info generation to be aware of the CFG and propagating states
2034 if (flag_unwind_tables && !ACCUMULATE_OUTGOING_ARGS
2035 && flag_omit_frame_pointer)
2037 warning (0, "unwind tables currently require a frame pointer "
2039 flag_omit_frame_pointer = 0;
2042 /* Save the current optimization options. */
2043 optimization_default_node = build_optimization_node ();
2044 optimization_current_node = optimization_default_node;
2047 /* This function can be called multiple times to reinitialize the compiler
2048 back end when register classes or instruction sets have changed,
2049 before each function. */
2051 backend_init_target (void)
2053 /* Initialize alignment variables. */
2056 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
2057 to initialize reg_raw_mode[]. */
2060 /* This invokes target hooks to set fixed_reg[] etc, which is
2064 /* This depends on stack_pointer_rtx. */
2065 init_fake_stack_mems ();
2067 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
2069 init_alias_target ();
2071 /* Depends on HARD_FRAME_POINTER_REGNUM. */
2074 /* The following initialization functions need to generate rtl, so
2075 provide a dummy function context for them. */
2076 init_dummy_function_start ();
2078 /* rtx_cost is mode-dependent, so cached values need to be recomputed
2079 on a mode change. */
2082 /* We may need to recompute regno_save_code[] and regno_restore_code[]
2083 after a mode change as well. */
2084 caller_save_initialized_p = false;
2086 expand_dummy_function_end ();
2089 /* Initialize the compiler back end. This function is called only once,
2090 when starting the compiler. */
2097 init_inline_once ();
2098 init_varasm_once ();
2099 save_register_info ();
2101 /* Initialize the target-specific back end pieces. */
2103 backend_init_target ();
2106 /* Initialize excess precision settings. */
2108 init_excess_precision (void)
2110 /* Adjust excess precision handling based on the target options. If
2111 the front end cannot handle it, flag_excess_precision_cmdline
2112 will already have been set accordingly in the post_options
2114 gcc_assert (flag_excess_precision_cmdline != EXCESS_PRECISION_DEFAULT);
2115 flag_excess_precision = flag_excess_precision_cmdline;
2116 if (flag_unsafe_math_optimizations)
2117 flag_excess_precision = EXCESS_PRECISION_FAST;
2118 if (flag_excess_precision == EXCESS_PRECISION_STANDARD)
2120 int flt_eval_method = TARGET_FLT_EVAL_METHOD;
2121 switch (flt_eval_method)
2125 /* Either the target acts unpredictably (-1) or has all the
2126 operations required not to have excess precision (0). */
2127 flag_excess_precision = EXCESS_PRECISION_FAST;
2131 /* In these cases, predictable excess precision makes
2135 /* Any other implementation-defined FLT_EVAL_METHOD values
2136 require the compiler to handle the associated excess
2137 precision rules in excess_precision_type. */
2143 /* Initialize things that are both lang-dependent and target-dependent.
2144 This function can be called more than once if target parameters change. */
2146 lang_dependent_init_target (void)
2148 /* This determines excess precision settings. */
2149 init_excess_precision ();
2151 /* This creates various _DECL nodes, so needs to be called after the
2152 front end is initialized. It also depends on the HAVE_xxx macros
2153 generated from the target machine description. */
2156 /* The following initialization functions need to generate rtl, so
2157 provide a dummy function context for them. */
2158 init_dummy_function_start ();
2160 /* Do the target-specific parts of expr initialization. */
2161 init_expr_target ();
2163 /* Although the actions of these functions are language-independent,
2164 they use optabs, so we cannot call them from backend_init. */
2168 expand_dummy_function_end ();
2171 /* Language-dependent initialization. Returns nonzero on success. */
2173 lang_dependent_init (const char *name)
2175 location_t save_loc = input_location;
2176 if (dump_base_name == 0)
2177 dump_base_name = name && name[0] ? name : "gccdump";
2179 /* Other front-end initialization. */
2180 input_location = BUILTINS_LOCATION;
2181 if (lang_hooks.init () == 0)
2183 input_location = save_loc;
2185 init_asm_output (name);
2187 /* If stack usage information is desired, open the output file. */
2188 if (flag_stack_usage)
2189 stack_usage_file = open_auxiliary_file ("su");
2191 /* This creates various _DECL nodes, so needs to be called after the
2192 front end is initialized. */
2195 /* Do the target-specific parts of the initialization. */
2196 lang_dependent_init_target ();
2198 /* If dbx symbol table desired, initialize writing it and output the
2199 predefined types. */
2200 timevar_push (TV_SYMOUT);
2202 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
2203 if (dwarf2out_do_frame ())
2204 dwarf2out_frame_init ();
2207 /* Now we have the correct original filename, we can initialize
2209 (*debug_hooks->init) (name);
2211 timevar_pop (TV_SYMOUT);
2217 /* Reinitialize everything when target parameters, such as register usage,
2220 target_reinit (void)
2222 /* Reinitialize RTL backend. */
2223 backend_init_target ();
2225 /* Reinitialize lang-dependent parts. */
2226 lang_dependent_init_target ();
2230 dump_memory_report (bool final)
2232 ggc_print_statistics ();
2233 stringpool_statistics ();
2234 dump_tree_statistics ();
2235 dump_gimple_statistics ();
2236 dump_rtx_statistics ();
2237 dump_alloc_pool_statistics ();
2238 dump_bitmap_statistics ();
2239 dump_vec_loc_statistics ();
2240 dump_ggc_loc_statistics (final);
2241 dump_alias_stats (stderr);
2242 dump_pta_stats (stderr);
2245 /* Clean up: close opened files, etc. */
2250 /* Close the dump files. */
2251 if (flag_gen_aux_info)
2253 fclose (aux_info_file);
2255 unlink (aux_info_file_name);
2258 /* Close non-debugging input and output files. Take special care to note
2259 whether fclose returns an error, since the pages might still be on the
2260 buffer chain while the file is open. */
2264 if (ferror (asm_out_file) != 0)
2265 fatal_error ("error writing to %s: %m", asm_file_name);
2266 if (fclose (asm_out_file) != 0)
2267 fatal_error ("error closing %s: %m", asm_file_name);
2269 unlink_if_ordinary (asm_file_name);
2272 if (stack_usage_file)
2273 fclose (stack_usage_file);
2276 finish_optimization_passes ();
2281 dump_memory_report (true);
2283 /* Language-specific end of compilation actions. */
2284 lang_hooks.finish ();
2287 /* Initialize the compiler, and compile the input file. */
2291 /* Initialize timing first. The C front ends read the main file in
2292 the post_options hook, and C++ does file timings. */
2293 if (time_report || !quiet_flag || flag_detailed_statistics)
2295 timevar_start (TV_TOTAL);
2299 /* Don't do any more if an error has already occurred. */
2302 /* This must be run always, because it is needed to compute the FP
2303 predefined macros, such as __LDBL_MAX__, for targets using non
2304 default FP formats. */
2305 init_adjust_machine_modes ();
2307 /* Set up the back-end if requested. */
2311 /* Language-dependent initialization. Returns true on success. */
2312 if (lang_dependent_init (main_input_filename))
2318 /* Stop timing and print the times. */
2319 timevar_stop (TV_TOTAL);
2320 timevar_print (stderr);
2323 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2324 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2325 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2327 It is not safe to call this function more than once. */
2330 toplev_main (int argc, char **argv)
2332 expandargv (&argc, &argv);
2334 /* Initialization of GCC's environment, and diagnostics. */
2335 general_init (argv[0]);
2337 /* One-off initialization of options that does not need to be
2338 repeated when options are added for particular functions. */
2339 init_options_once ();
2341 /* Initialize global options structures; this must be repeated for
2342 each structure used for parsing options. */
2343 init_options_struct (&global_options, &global_options_set);
2344 lang_hooks.init_options_struct (&global_options);
2346 /* Convert the options to an array. */
2347 decode_cmdline_options_to_array_default_mask (argc,
2348 CONST_CAST2 (const char **,
2350 &save_decoded_options,
2351 &save_decoded_options_count);
2353 /* Perform language-specific options initialization. */
2354 lang_hooks.init_options (save_decoded_options_count, save_decoded_options);
2356 /* Parse the options and do minimal processing; basically just
2357 enough to default flags appropriately. */
2358 decode_options (&global_options, &global_options_set,
2359 save_decoded_options, save_decoded_options_count,
2360 UNKNOWN_LOCATION, global_dc);
2362 handle_common_deferred_options ();
2366 initialize_plugins ();
2369 print_version (stderr, "");
2372 print_plugins_help (stderr, "");
2374 /* Exit early if we can (e.g. -help). */
2375 if (!exit_after_options)
2378 if (warningcount || errorcount)
2379 print_ignored_options ();
2380 diagnostic_finish (global_dc);
2382 /* Invoke registered plugin callbacks if any. */
2383 invoke_plugin_callbacks (PLUGIN_FINISH, NULL);
2385 finalize_plugins ();
2387 return (FATAL_EXIT_CODE);
2389 return (SUCCESS_EXIT_CODE);