1 /* Top level of GCC compilers (cc1, cc1plus, etc.)
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
29 #include "coretypes.h"
33 #ifdef HAVE_SYS_RESOURCE_H
34 # include <sys/resource.h>
37 #ifdef HAVE_SYS_TIMES_H
38 # include <sys/times.h>
44 #include "realmpfr.h" /* For GMP/MPFR/MPC versions, in print_version. */
49 #include "insn-attr.h"
50 #include "insn-config.h"
51 #include "insn-flags.h"
52 #include "hard-reg-set.h"
59 #include "basic-block.h"
65 #include "diagnostic.h"
66 #include "tree-diagnostic.h"
67 #include "tree-pretty-print.h"
71 #include "dwarf2asm.h"
72 #include "integrate.h"
75 #include "langhooks.h"
76 #include "cfglayout.h"
78 #include "hosthooks.h"
81 #include "opts-diagnostic.h"
83 #include "value-prof.h"
84 #include "alloc-pool.h"
85 #include "tree-mudflap.h"
86 #include "tree-pass.h"
88 #include "tree-ssa-alias.h"
91 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
92 #include "dwarf2out.h"
95 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
99 #ifdef SDB_DEBUGGING_INFO
103 #ifdef XCOFF_DEBUGGING_INFO
104 #include "xcoffout.h" /* Needed for external data
105 declarations for e.g. AIX 4.x. */
108 static void general_init (const char *);
109 static void do_compile (void);
110 static void process_options (void);
111 static void backend_init (void);
112 static int lang_dependent_init (const char *);
113 static void init_asm_output (const char *);
114 static void finalize (void);
116 static void crash_signal (int) ATTRIBUTE_NORETURN;
117 static void setup_core_dumping (void);
118 static void compile_file (void);
120 /* Nonzero to dump debug info whilst parsing (-dy option). */
121 static int set_yydebug;
123 /* True if we don't need a backend (e.g. preprocessing only). */
124 static bool no_backend;
126 /* Length of line when printing switch values. */
129 /* Decoded options, and number of such options. */
130 static struct cl_decoded_option *save_decoded_options;
131 static unsigned int save_decoded_options_count;
133 /* Name of top-level original source file (what was input to cpp).
134 This comes from the #-command at the beginning of the actual input.
135 If there isn't any there, then this is the cc1 input file name. */
137 const char *main_input_filename;
139 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
140 to optimize in process_options (). */
141 #define AUTODETECT_VALUE 2
143 /* Name to use as base of names for dump output files. */
145 const char *dump_base_name;
147 /* Directory used for dump output files. */
149 const char *dump_dir_name;
151 /* Name to use as a base for auxiliary output files. */
153 const char *aux_base_name;
155 /* Prefix for profile data files */
156 const char *profile_data_prefix;
158 /* A mask of target_flags that includes bit X if X was set or cleared
159 on the command line. */
161 int target_flags_explicit;
163 /* Debug hooks - dependent upon command line options. */
165 const struct gcc_debug_hooks *debug_hooks;
167 /* Other flags saying which kinds of debugging dump have been requested. */
169 int rtl_dump_and_exit;
170 int flag_print_asm_name;
171 enum graph_dump_types graph_dump_format;
173 /* Name for output file of assembly code, specified with -o. */
175 const char *asm_file_name;
177 /* Nonzero means do optimizations. -O.
178 Particular numeric values stand for particular amounts of optimization;
179 thus, -O2 stores 2 here. However, the optimizations beyond the basic
180 ones are not controlled directly by this variable. Instead, they are
181 controlled by individual `flag_...' variables that are defaulted
182 based on this variable. */
186 /* Nonzero means optimize for size. -Os.
187 The only valid values are zero and nonzero. When optimize_size is
188 nonzero, optimize defaults to 2, but certain individual code
189 bloating optimizations are disabled. */
191 int optimize_size = 0;
193 /* True if this is the lto front end. This is used to disable
194 gimple generation and lowering passes that are normally run on the
195 output of a front end. These passes must be bypassed for lto since
196 they have already been done before the gimple was written. */
198 bool in_lto_p = false;
200 /* Nonzero if we should write GIMPLE bytecode for link-time optimization. */
202 int flag_generate_lto;
204 /* The FUNCTION_DECL for the function currently being compiled,
205 or 0 if between functions. */
206 tree current_function_decl;
208 /* Set to the FUNC_BEGIN label of the current function, or NULL
210 const char * current_function_func_begin_label;
212 /* A random sequence of characters, unless overridden by user. */
213 static const char *flag_random_seed;
215 /* A local time stamp derived from the time of compilation. It will be
216 zero if the system cannot provide a time. It will be -1u, if the
217 user has specified a particular random seed. */
222 /* 0 means straightforward implementation of complex divide acceptable.
223 1 means wide ranges of inputs must work for complex divide.
224 2 means C99-like requirements for complex multiply and divide. */
226 int flag_complex_method = 1;
228 /* Nonzero means we should be saving declaration info into a .X file. */
230 int flag_gen_aux_info = 0;
232 /* Specified name of aux-info file. */
234 const char *aux_info_file_name;
236 /* Nonzero if we are compiling code for a shared library, zero for
241 /* Generate code for GNU or NeXT Objective-C runtime environment. */
243 #ifdef NEXT_OBJC_RUNTIME
244 int flag_next_runtime = 1;
246 int flag_next_runtime = 0;
249 /* Set to the default thread-local storage (tls) model to use. */
251 enum tls_model flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC;
253 /* Set the default region and algorithm for the integrated register
256 enum ira_algorithm flag_ira_algorithm = IRA_ALGORITHM_CB;
257 enum ira_region flag_ira_region = IRA_REGION_MIXED;
259 /* Set the default for excess precision. */
261 enum excess_precision flag_excess_precision_cmdline = EXCESS_PRECISION_DEFAULT;
263 /* Nonzero means change certain warnings into errors.
264 Usually these are warnings about failure to conform to some standard. */
266 int flag_pedantic_errors = 0;
268 /* Nonzero means make permerror produce warnings instead of errors. */
270 int flag_permissive = 0;
272 /* -dA causes debug commentary information to be produced in
273 the generated assembly code (to make it more readable). This option
274 is generally only of use to those who actually need to read the
275 generated assembly code (perhaps while debugging the compiler itself).
276 Currently, this switch is only used by dwarfout.c; however, it is intended
277 to be a catchall for printing debug information in the assembler file. */
279 int flag_debug_asm = 0;
281 /* -dP causes the rtl to be emitted as a comment in assembly. */
283 int flag_dump_rtl_in_asm = 0;
285 /* When non-NULL, indicates that whenever space is allocated on the
286 stack, the resulting stack pointer must not pass this
287 address---that is, for stacks that grow downward, the stack pointer
288 must always be greater than or equal to this address; for stacks
289 that grow upward, the stack pointer must be less than this address.
290 At present, the rtx may be either a REG or a SYMBOL_REF, although
291 the support provided depends on the backend. */
294 /* Positive if we should track variables, negative if we should run
295 the var-tracking pass only to discard debug annotations, zero if
296 we're not to run it. When flag_var_tracking == AUTODETECT_VALUE it
297 will be set according to optimize, debug_info_level and debug_hooks
298 in process_options (). */
299 int flag_var_tracking = AUTODETECT_VALUE;
301 /* Positive if we should track variables at assignments, negative if
302 we should run the var-tracking pass only to discard debug
303 annotations. When flag_var_tracking_assignments ==
304 AUTODETECT_VALUE it will be set according to flag_var_tracking. */
305 int flag_var_tracking_assignments = AUTODETECT_VALUE;
307 /* Nonzero if we should toggle flag_var_tracking_assignments after
308 processing options and computing its default. */
309 int flag_var_tracking_assignments_toggle = 0;
311 /* Type of stack check. */
312 enum stack_check_type flag_stack_check = NO_STACK_CHECK;
314 /* True if the user has tagged the function with the 'section'
317 bool user_defined_section_attribute = false;
319 struct target_flag_state default_target_flag_state;
320 #if SWITCHABLE_TARGET
321 struct target_flag_state *this_target_flag_state = &default_target_flag_state;
323 #define this_target_flag_state (&default_target_flag_state)
328 const char *const string;
332 lang_independent_options;
334 /* Nonzero if subexpressions must be evaluated from left-to-right. */
335 int flag_evaluation_order = 0;
337 /* The user symbol prefix after having resolved same. */
338 const char *user_label_prefix;
340 static const param_info lang_independent_params[] = {
341 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
342 { OPTION, DEFAULT, false, MIN, MAX, HELP },
343 #include "params.def"
345 { NULL, 0, false, 0, 0, NULL }
348 /* Output files for assembler code (real compiler output)
349 and debugging dumps. */
353 FILE *dump_file = NULL;
354 const char *dump_file_name;
356 /* The current working directory of a translation. It's generally the
357 directory from which compilation was initiated, but a preprocessed
358 file may specify the original directory in which it was
361 static const char *src_pwd;
363 /* Initialize src_pwd with the given string, and return true. If it
364 was already initialized, return false. As a special case, it may
365 be called with a NULL argument to test whether src_pwd has NOT been
369 set_src_pwd (const char *pwd)
373 if (strcmp (src_pwd, pwd) == 0)
379 src_pwd = xstrdup (pwd);
383 /* Return the directory from which the translation unit was initiated,
384 in case set_src_pwd() was not called before to assign it a
400 /* Called when the start of a function definition is parsed,
401 this function prints on stderr the name of the function. */
403 announce_function (tree decl)
407 if (rtl_dump_and_exit)
408 fprintf (stderr, "%s ",
409 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl))));
411 fprintf (stderr, " %s",
412 identifier_to_locale (lang_hooks.decl_printable_name (decl, 2)));
414 pp_needs_newline (global_dc->printer) = true;
415 diagnostic_set_last_function (global_dc, (diagnostic_info *) NULL);
419 /* Initialize local_tick with the time of day, or -1 if
420 flag_random_seed is set. */
423 init_local_tick (void)
425 if (!flag_random_seed)
427 /* Get some more or less random data. */
428 #ifdef HAVE_GETTIMEOFDAY
432 gettimeofday (&tv, NULL);
433 local_tick = tv.tv_sec * 1000 + tv.tv_usec / 1000;
437 time_t now = time (NULL);
439 if (now != (time_t)-1)
440 local_tick = (unsigned) now;
448 /* Set up a default flag_random_seed and local_tick, unless the user
449 already specified one. Must be called after init_local_tick. */
452 init_random_seed (void)
454 unsigned HOST_WIDE_INT value;
455 static char random_seed[HOST_BITS_PER_WIDE_INT / 4 + 3];
457 value = local_tick ^ getpid ();
459 sprintf (random_seed, HOST_WIDE_INT_PRINT_HEX, value);
460 flag_random_seed = random_seed;
463 /* Obtain the random_seed string. Unless NOINIT, initialize it if
464 it's not provided in the command line. */
467 get_random_seed (bool noinit)
469 if (!flag_random_seed && !noinit)
471 return flag_random_seed;
474 /* Modify the random_seed string to VAL. Return its previous
478 set_random_seed (const char *val)
480 const char *old = flag_random_seed;
481 flag_random_seed = val;
485 #if GCC_VERSION < 3004
487 /* The functions floor_log2 and exact_log2 are defined as inline
488 functions in toplev.h if GCC_VERSION >= 3004. The definitions here
489 are used for older versions of gcc. */
491 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
492 If X is 0, return -1. */
495 floor_log2 (unsigned HOST_WIDE_INT x)
502 if (HOST_BITS_PER_WIDE_INT > 64)
503 if (x >= (unsigned HOST_WIDE_INT) 1 << (t + 64))
505 if (HOST_BITS_PER_WIDE_INT > 32)
506 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 32))
508 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 16))
510 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 8))
512 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 4))
514 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 2))
516 if (x >= ((unsigned HOST_WIDE_INT) 1) << (t + 1))
522 /* Return the logarithm of X, base 2, considering X unsigned,
523 if X is a power of 2. Otherwise, returns -1. */
526 exact_log2 (unsigned HOST_WIDE_INT x)
530 return floor_log2 (x);
533 #endif /* GCC_VERSION < 3004 */
535 /* Handler for fatal signals, such as SIGSEGV. These are transformed
536 into ICE messages, which is much more user friendly. In case the
537 error printer crashes, reset the signal to prevent infinite recursion. */
540 crash_signal (int signo)
542 signal (signo, SIG_DFL);
544 /* If we crashed while processing an ASM statement, then be a little more
545 graceful. It's most likely the user's fault. */
546 if (this_is_asm_operands)
548 output_operand_lossage ("unrecoverable error");
549 exit (FATAL_EXIT_CODE);
552 internal_error ("%s", strsignal (signo));
555 /* Arrange to dump core on error. (The regular error message is still
556 printed first, except in the case of abort().) */
559 setup_core_dumping (void)
562 signal (SIGABRT, SIG_DFL);
564 #if defined(HAVE_SETRLIMIT)
567 if (getrlimit (RLIMIT_CORE, &rlim) != 0)
568 fatal_error ("getting core file size maximum limit: %m");
569 rlim.rlim_cur = rlim.rlim_max;
570 if (setrlimit (RLIMIT_CORE, &rlim) != 0)
571 fatal_error ("setting core file size limit to maximum: %m");
574 diagnostic_abort_on_error (global_dc);
578 /* Strip off a legitimate source ending from the input string NAME of
579 length LEN. Rather than having to know the names used by all of
580 our front ends, we strip off an ending of a period followed by
581 up to five characters. (Java uses ".class".) */
584 strip_off_ending (char *name, int len)
587 for (i = 2; i < 6 && len > i; i++)
589 if (name[len - i] == '.')
591 name[len - i] = '\0';
597 /* Output a quoted string. */
600 output_quoted_string (FILE *asm_file, const char *string)
602 #ifdef OUTPUT_QUOTED_STRING
603 OUTPUT_QUOTED_STRING (asm_file, string);
607 putc ('\"', asm_file);
608 while ((c = *string++) != 0)
612 if (c == '\"' || c == '\\')
613 putc ('\\', asm_file);
617 fprintf (asm_file, "\\%03o", (unsigned char) c);
619 putc ('\"', asm_file);
623 /* A subroutine of wrapup_global_declarations. We've come to the end of
624 the compilation unit. All deferred variables should be undeferred,
625 and all incomplete decls should be finalized. */
628 wrapup_global_declaration_1 (tree decl)
630 /* We're not deferring this any longer. Assignment is conditional to
631 avoid needlessly dirtying PCH pages. */
632 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl), TS_DECL_WITH_VIS)
633 && DECL_DEFER_OUTPUT (decl) != 0)
634 DECL_DEFER_OUTPUT (decl) = 0;
636 if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0)
637 lang_hooks.finish_incomplete_decl (decl);
640 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
641 needs to be output. Return true if it is output. */
644 wrapup_global_declaration_2 (tree decl)
646 if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
649 /* Don't write out static consts, unless we still need them.
651 We also keep static consts if not optimizing (for debugging),
652 unless the user specified -fno-keep-static-consts.
653 ??? They might be better written into the debug information.
654 This is possible when using DWARF.
656 A language processor that wants static constants to be always
657 written out (even if it is not used) is responsible for
658 calling rest_of_decl_compilation itself. E.g. the C front-end
659 calls rest_of_decl_compilation from finish_decl.
660 One motivation for this is that is conventional in some
661 environments to write things like:
662 static const char rcsid[] = "... version string ...";
663 intending to force the string to be in the executable.
665 A language processor that would prefer to have unneeded
666 static constants "optimized away" would just defer writing
667 them out until here. E.g. C++ does this, because static
668 constants are often defined in header files.
670 ??? A tempting alternative (for both C and C++) would be
671 to force a constant to be written if and only if it is
672 defined in a main file, as opposed to an include file. */
674 if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
676 struct varpool_node *node;
678 node = varpool_get_node (decl);
680 if (!node && flag_ltrans)
682 else if (node && node->finalized)
684 else if (node && node->alias)
686 else if (!cgraph_global_info_ready
688 || TREE_USED (DECL_ASSEMBLER_NAME (decl))))
690 else if (node && node->needed)
692 else if (DECL_COMDAT (decl))
694 else if (TREE_READONLY (decl) && !TREE_PUBLIC (decl)
695 && (optimize || !flag_keep_static_consts
696 || DECL_ARTIFICIAL (decl)))
701 rest_of_decl_compilation (decl, 1, 1);
709 /* Do any final processing required for the declarations in VEC, of
710 which there are LEN. We write out inline functions and variables
711 that have been deferred until this point, but which are required.
712 Returns nonzero if anything was put out. */
715 wrapup_global_declarations (tree *vec, int len)
717 bool reconsider, output_something = false;
720 for (i = 0; i < len; i++)
721 wrapup_global_declaration_1 (vec[i]);
723 /* Now emit any global variables or functions that we have been
724 putting off. We need to loop in case one of the things emitted
725 here references another one which comes earlier in the list. */
729 for (i = 0; i < len; i++)
730 reconsider |= wrapup_global_declaration_2 (vec[i]);
732 output_something = true;
736 return output_something;
739 /* A subroutine of check_global_declarations. Issue appropriate warnings
740 for the global declaration DECL. */
743 check_global_declaration_1 (tree decl)
745 /* Warn about any function declared static but not defined. We don't
746 warn about variables, because many programs have static variables
747 that exist only to get some text into the object file. */
748 if (TREE_CODE (decl) == FUNCTION_DECL
749 && DECL_INITIAL (decl) == 0
750 && DECL_EXTERNAL (decl)
751 && ! DECL_ARTIFICIAL (decl)
752 && ! TREE_NO_WARNING (decl)
753 && ! TREE_PUBLIC (decl)
754 && (warn_unused_function
755 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
757 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
758 pedwarn (input_location, 0, "%q+F used but never defined", decl);
760 warning (OPT_Wunused_function, "%q+F declared %<static%> but never defined", decl);
761 /* This symbol is effectively an "extern" declaration now. */
762 TREE_PUBLIC (decl) = 1;
763 assemble_external (decl);
766 /* Warn about static fns or vars defined but not used. */
767 if (((warn_unused_function && TREE_CODE (decl) == FUNCTION_DECL)
768 /* We don't warn about "static const" variables because the
769 "rcs_id" idiom uses that construction. */
770 || (warn_unused_variable
771 && TREE_CODE (decl) == VAR_DECL && ! TREE_READONLY (decl)))
772 && ! DECL_IN_SYSTEM_HEADER (decl)
773 && ! TREE_USED (decl)
774 /* The TREE_USED bit for file-scope decls is kept in the identifier,
775 to handle multiple external decls in different scopes. */
776 && ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl)))
777 && ! DECL_EXTERNAL (decl)
778 && ! TREE_PUBLIC (decl)
779 /* A volatile variable might be used in some non-obvious way. */
780 && ! TREE_THIS_VOLATILE (decl)
781 /* Global register variables must be declared to reserve them. */
782 && ! (TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
783 /* Otherwise, ask the language. */
784 && lang_hooks.decls.warn_unused_global (decl))
785 warning ((TREE_CODE (decl) == FUNCTION_DECL)
786 ? OPT_Wunused_function
787 : OPT_Wunused_variable,
788 "%q+D defined but not used", decl);
791 /* Issue appropriate warnings for the global declarations in VEC (of
792 which there are LEN). */
795 check_global_declarations (tree *vec, int len)
799 for (i = 0; i < len; i++)
800 check_global_declaration_1 (vec[i]);
803 /* Emit debugging information for all global declarations in VEC. */
806 emit_debug_global_declarations (tree *vec, int len)
810 /* Avoid confusing the debug information machinery when there are errors. */
814 timevar_push (TV_SYMOUT);
815 for (i = 0; i < len; i++)
816 debug_hooks->global_decl (vec[i]);
817 timevar_pop (TV_SYMOUT);
820 /* Warn about a use of an identifier which was marked deprecated. */
822 warn_deprecated_use (tree node, tree attr)
826 if (node == 0 || !warn_deprecated_decl)
832 attr = DECL_ATTRIBUTES (node);
833 else if (TYPE_P (node))
835 tree decl = TYPE_STUB_DECL (node);
837 attr = lookup_attribute ("deprecated",
838 TYPE_ATTRIBUTES (TREE_TYPE (decl)));
843 attr = lookup_attribute ("deprecated", attr);
846 msg = TREE_STRING_POINTER (TREE_VALUE (TREE_VALUE (attr)));
852 expanded_location xloc = expand_location (DECL_SOURCE_LOCATION (node));
854 warning (OPT_Wdeprecated_declarations,
855 "%qD is deprecated (declared at %s:%d): %s",
856 node, xloc.file, xloc.line, msg);
858 warning (OPT_Wdeprecated_declarations,
859 "%qD is deprecated (declared at %s:%d)",
860 node, xloc.file, xloc.line);
862 else if (TYPE_P (node))
864 tree what = NULL_TREE;
865 tree decl = TYPE_STUB_DECL (node);
867 if (TYPE_NAME (node))
869 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
870 what = TYPE_NAME (node);
871 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
872 && DECL_NAME (TYPE_NAME (node)))
873 what = DECL_NAME (TYPE_NAME (node));
878 expanded_location xloc
879 = expand_location (DECL_SOURCE_LOCATION (decl));
883 warning (OPT_Wdeprecated_declarations,
884 "%qE is deprecated (declared at %s:%d): %s",
885 what, xloc.file, xloc.line, msg);
887 warning (OPT_Wdeprecated_declarations,
888 "%qE is deprecated (declared at %s:%d)", what,
889 xloc.file, xloc.line);
894 warning (OPT_Wdeprecated_declarations,
895 "type is deprecated (declared at %s:%d): %s",
896 xloc.file, xloc.line, msg);
898 warning (OPT_Wdeprecated_declarations,
899 "type is deprecated (declared at %s:%d)",
900 xloc.file, xloc.line);
908 warning (OPT_Wdeprecated_declarations, "%qE is deprecated: %s",
911 warning (OPT_Wdeprecated_declarations, "%qE is deprecated", what);
916 warning (OPT_Wdeprecated_declarations, "type is deprecated: %s",
919 warning (OPT_Wdeprecated_declarations, "type is deprecated");
925 /* Compile an entire translation unit. Write a file of assembly
926 output and various debugging dumps. */
931 /* Initialize yet another pass. */
933 ggc_protect_identifiers = true;
936 init_final (main_input_filename);
937 coverage_init (aux_base_name);
939 invoke_plugin_callbacks (PLUGIN_START_UNIT, NULL);
941 timevar_push (TV_PARSE);
943 /* Call the parser, which parses the entire file (calling
944 rest_of_compilation for each function). */
945 lang_hooks.parse_file (set_yydebug);
947 /* Compilation is now finished except for writing
948 what's left of the symbol table output. */
949 timevar_pop (TV_PARSE);
951 if (flag_syntax_only || flag_wpa)
954 ggc_protect_identifiers = false;
956 /* This must also call cgraph_finalize_compilation_unit. */
957 lang_hooks.decls.final_write_globals ();
962 /* Ensure that emulated TLS control vars are finalized and build
963 a static constructor for them, when it is required. */
964 if (!targetm.have_tls)
967 varpool_assemble_pending_decls ();
970 /* Likewise for mudflap static object registrations. */
972 mudflap_finish_file ();
974 output_shared_constant_pool ();
975 output_object_blocks ();
977 /* Write out any pending weak symbol declarations. */
980 /* This must be at the end before unwind and debug info.
981 Some target ports emit PIC setup thunks here. */
982 targetm.asm_out.code_end ();
984 /* Do dbx symbols. */
985 timevar_push (TV_SYMOUT);
987 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
988 if (dwarf2out_do_frame ())
989 dwarf2out_frame_finish ();
992 (*debug_hooks->finish) (main_input_filename);
993 timevar_pop (TV_SYMOUT);
995 /* Output some stuff at end of file if nec. */
997 dw2_output_indirect_constants ();
999 /* Flush any pending external directives. */
1000 process_pending_assemble_externals ();
1002 /* Emit LTO marker if LTO info has been previously emitted. This is
1003 used by collect2 to determine whether an object file contains IL.
1004 We used to emit an undefined reference here, but this produces
1005 link errors if an object file with IL is stored into a shared
1006 library without invoking lto1. */
1007 if (flag_generate_lto)
1009 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1010 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, NULL_TREE,
1012 (unsigned HOST_WIDE_INT) 1, 8);
1013 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1014 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, "__gnu_lto_v1",
1015 (unsigned HOST_WIDE_INT) 1, 8);
1017 ASM_OUTPUT_COMMON (asm_out_file, "__gnu_lto_v1",
1018 (unsigned HOST_WIDE_INT) 1,
1019 (unsigned HOST_WIDE_INT) 1);
1023 /* Attach a special .ident directive to the end of the file to identify
1024 the version of GCC which compiled this code. The format of the .ident
1025 string is patterned after the ones produced by native SVR4 compilers. */
1029 const char *pkg_version = "(GNU) ";
1031 if (strcmp ("(GCC) ", pkgversion_string))
1032 pkg_version = pkgversion_string;
1033 fprintf (asm_out_file, "%s\"GCC: %s%s\"\n",
1034 IDENT_ASM_OP, pkg_version, version_string);
1038 /* Invoke registered plugin callbacks. */
1039 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT, NULL);
1041 /* This must be at the end. Some target ports emit end of file directives
1042 into the assembly file here, and hence we can not output anything to the
1043 assembly file after this point. */
1044 targetm.asm_out.file_end ();
1047 /* Parse a -d... command line switch. */
1050 decode_d_option (const char *arg)
1061 flag_print_asm_name = 1;
1064 flag_dump_rtl_in_asm = 1;
1065 flag_print_asm_name = 1;
1068 graph_dump_format = vcg;
1071 rtl_dump_and_exit = 1;
1076 case 'D': /* These are handled by the preprocessor. */
1083 setup_core_dumping();
1086 enable_rtl_dump_file ();
1090 warning (0, "unrecognized gcc debugging option: %c", c);
1095 /* Indexed by enum debug_info_type. */
1096 const char *const debug_type_names[] =
1098 "none", "stabs", "coff", "dwarf-2", "xcoff", "vms"
1101 /* Print version information to FILE.
1102 Each line begins with INDENT (for the case where FILE is the
1103 assembler output file). */
1106 print_version (FILE *file, const char *indent)
1108 static const char fmt1[] =
1110 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
1112 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
1115 static const char fmt2[] =
1116 N_("GMP version %s, MPFR version %s, MPC version %s\n");
1117 static const char fmt3[] =
1118 N_("%s%swarning: %s header version %s differs from library version %s.\n");
1119 static const char fmt4[] =
1120 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
1122 #define __VERSION__ "[?]"
1125 file == stderr ? _(fmt1) : fmt1,
1126 indent, *indent != 0 ? " " : "",
1127 lang_hooks.name, pkgversion_string, version_string, TARGET_NAME,
1128 indent, __VERSION__);
1130 /* We need to stringify the GMP macro values. Ugh, gmp_version has
1131 two string formats, "i.j.k" and "i.j" when k is zero. As of
1132 gmp-4.3.0, GMP always uses the 3 number format. */
1133 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
1134 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3(X)
1135 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
1136 #define GCC_GMP_VERSION \
1137 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
1138 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
1139 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
1140 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR)
1142 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
1143 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) "." \
1144 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_PATCHLEVEL)
1147 file == stderr ? _(fmt2) : fmt2,
1148 GCC_GMP_STRINGIFY_VERSION, MPFR_VERSION_STRING, MPC_VERSION_STRING);
1149 if (strcmp (GCC_GMP_STRINGIFY_VERSION, gmp_version))
1151 file == stderr ? _(fmt3) : fmt3,
1152 indent, *indent != 0 ? " " : "",
1153 "GMP", GCC_GMP_STRINGIFY_VERSION, gmp_version);
1154 if (strcmp (MPFR_VERSION_STRING, mpfr_get_version ()))
1156 file == stderr ? _(fmt3) : fmt3,
1157 indent, *indent != 0 ? " " : "",
1158 "MPFR", MPFR_VERSION_STRING, mpfr_get_version ());
1159 if (strcmp (MPC_VERSION_STRING, mpc_get_version ()))
1161 file == stderr ? _(fmt3) : fmt3,
1162 indent, *indent != 0 ? " " : "",
1163 "MPC", MPC_VERSION_STRING, mpc_get_version ());
1165 file == stderr ? _(fmt4) : fmt4,
1166 indent, *indent != 0 ? " " : "",
1167 PARAM_VALUE (GGC_MIN_EXPAND), PARAM_VALUE (GGC_MIN_HEAPSIZE));
1169 print_plugins_versions (file, indent);
1172 #ifdef ASM_COMMENT_START
1174 print_to_asm_out_file (print_switch_type type, const char * text)
1176 bool prepend_sep = true;
1180 case SWITCH_TYPE_LINE_END:
1181 putc ('\n', asm_out_file);
1184 case SWITCH_TYPE_LINE_START:
1185 fputs (ASM_COMMENT_START, asm_out_file);
1186 return strlen (ASM_COMMENT_START);
1188 case SWITCH_TYPE_DESCRIPTIVE:
1189 if (ASM_COMMENT_START[0] == 0)
1190 prepend_sep = false;
1192 case SWITCH_TYPE_PASSED:
1193 case SWITCH_TYPE_ENABLED:
1195 fputc (' ', asm_out_file);
1196 fputs (text, asm_out_file);
1197 /* No need to return the length here as
1198 print_single_switch has already done it. */
1208 print_to_stderr (print_switch_type type, const char * text)
1212 case SWITCH_TYPE_LINE_END:
1213 putc ('\n', stderr);
1216 case SWITCH_TYPE_LINE_START:
1219 case SWITCH_TYPE_PASSED:
1220 case SWITCH_TYPE_ENABLED:
1221 fputc (' ', stderr);
1224 case SWITCH_TYPE_DESCRIPTIVE:
1225 fputs (text, stderr);
1226 /* No need to return the length here as
1227 print_single_switch has already done it. */
1235 /* Print an option value and return the adjusted position in the line.
1236 ??? print_fn doesn't handle errors, eg disk full; presumably other
1237 code will catch a disk full though. */
1240 print_single_switch (print_switch_fn_type print_fn,
1242 print_switch_type type,
1245 /* The ultrix fprintf returns 0 on success, so compute the result
1246 we want here since we need it for the following test. The +1
1247 is for the separator character that will probably be emitted. */
1248 int len = strlen (text) + 1;
1251 && pos + len > MAX_LINE)
1253 print_fn (SWITCH_TYPE_LINE_END, NULL);
1258 pos += print_fn (SWITCH_TYPE_LINE_START, NULL);
1260 print_fn (type, text);
1264 /* Print active target switches using PRINT_FN.
1265 POS is the current cursor position and MAX is the size of a "line".
1266 Each line begins with INDENT and ends with TERM.
1267 Each switch is separated from the next by SEP. */
1270 print_switch_values (print_switch_fn_type print_fn)
1275 /* Fill in the -frandom-seed option, if the user didn't pass it, so
1276 that it can be printed below. This helps reproducibility. */
1277 if (!flag_random_seed)
1278 init_random_seed ();
1280 /* Print the options as passed. */
1281 pos = print_single_switch (print_fn, pos,
1282 SWITCH_TYPE_DESCRIPTIVE, _("options passed: "));
1284 for (j = 1; j < save_decoded_options_count; j++)
1286 switch (save_decoded_options[j].opt_index)
1299 pos = print_single_switch (print_fn, pos, SWITCH_TYPE_PASSED,
1300 save_decoded_options[j].orig_option_with_args_text);
1304 print_fn (SWITCH_TYPE_LINE_END, NULL);
1306 /* Print the -f and -m options that have been enabled.
1307 We don't handle language specific options but printing argv
1309 pos = print_single_switch (print_fn, 0,
1310 SWITCH_TYPE_DESCRIPTIVE, _("options enabled: "));
1312 for (j = 0; j < cl_options_count; j++)
1313 if ((cl_options[j].flags & CL_REPORT)
1314 && option_enabled (j) > 0)
1315 pos = print_single_switch (print_fn, pos,
1316 SWITCH_TYPE_ENABLED, cl_options[j].opt_text);
1318 print_fn (SWITCH_TYPE_LINE_END, NULL);
1321 /* Open assembly code output file. Do this even if -fsyntax-only is
1322 on, because then the driver will have provided the name of a
1323 temporary file or bit bucket for us. NAME is the file specified on
1324 the command line, possibly NULL. */
1326 init_asm_output (const char *name)
1328 if (name == NULL && asm_file_name == 0)
1329 asm_out_file = stdout;
1332 if (asm_file_name == 0)
1334 int len = strlen (dump_base_name);
1335 char *dumpname = XNEWVEC (char, len + 6);
1337 memcpy (dumpname, dump_base_name, len + 1);
1338 strip_off_ending (dumpname, len);
1339 strcat (dumpname, ".s");
1340 asm_file_name = dumpname;
1342 if (!strcmp (asm_file_name, "-"))
1343 asm_out_file = stdout;
1345 asm_out_file = fopen (asm_file_name, "w+b");
1346 if (asm_out_file == 0)
1347 fatal_error ("can%'t open %s for writing: %m", asm_file_name);
1350 if (!flag_syntax_only)
1352 targetm.asm_out.file_start ();
1354 if (flag_record_gcc_switches)
1356 if (targetm.asm_out.record_gcc_switches)
1358 /* Let the target know that we are about to start recording. */
1359 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
1361 /* Now record the switches. */
1362 print_switch_values (targetm.asm_out.record_gcc_switches);
1363 /* Let the target know that the recording is over. */
1364 targetm.asm_out.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE,
1368 inform (input_location, "-frecord-gcc-switches is not supported by the current target");
1371 #ifdef ASM_COMMENT_START
1372 if (flag_verbose_asm)
1374 /* Print the list of switches in effect
1375 into the assembler file as comments. */
1376 print_version (asm_out_file, ASM_COMMENT_START);
1377 print_switch_values (print_to_asm_out_file);
1378 putc ('\n', asm_out_file);
1384 /* Return true if the state of option OPTION should be stored in PCH files
1385 and checked by default_pch_valid_p. Store the option's current state
1389 option_affects_pch_p (int option, struct cl_option_state *state)
1391 if ((cl_options[option].flags & CL_TARGET) == 0)
1393 if (cl_options[option].flag_var == &target_flags)
1394 if (targetm.check_pch_target_flags)
1396 return get_option_state (option, state);
1399 /* Default version of get_pch_validity.
1400 By default, every flag difference is fatal; that will be mostly right for
1401 most targets, but completely right for very few. */
1404 default_get_pch_validity (size_t *sz)
1406 struct cl_option_state state;
1411 if (targetm.check_pch_target_flags)
1412 *sz += sizeof (target_flags);
1413 for (i = 0; i < cl_options_count; i++)
1414 if (option_affects_pch_p (i, &state))
1417 result = r = XNEWVEC (char, *sz);
1421 if (targetm.check_pch_target_flags)
1423 memcpy (r, &target_flags, sizeof (target_flags));
1424 r += sizeof (target_flags);
1427 for (i = 0; i < cl_options_count; i++)
1428 if (option_affects_pch_p (i, &state))
1430 memcpy (r, state.data, state.size);
1437 /* Return a message which says that a PCH file was created with a different
1438 setting of OPTION. */
1441 pch_option_mismatch (const char *option)
1445 asprintf (&r, _("created and used with differing settings of '%s'"), option);
1447 return _("out of memory");
1451 /* Default version of pch_valid_p. */
1454 default_pch_valid_p (const void *data_p, size_t len)
1456 struct cl_option_state state;
1457 const char *data = (const char *)data_p;
1460 /* -fpic and -fpie also usually make a PCH invalid. */
1461 if (data[0] != flag_pic)
1462 return _("created and used with different settings of -fpic");
1463 if (data[1] != flag_pie)
1464 return _("created and used with different settings of -fpie");
1467 /* Check target_flags. */
1468 if (targetm.check_pch_target_flags)
1473 memcpy (&tf, data, sizeof (target_flags));
1474 data += sizeof (target_flags);
1475 len -= sizeof (target_flags);
1476 r = targetm.check_pch_target_flags (tf);
1481 for (i = 0; i < cl_options_count; i++)
1482 if (option_affects_pch_p (i, &state))
1484 if (memcmp (data, state.data, state.size) != 0)
1485 return pch_option_mismatch (cl_options[i].opt_text);
1493 /* Default tree printer. Handles declarations only. */
1495 default_tree_printer (pretty_printer *pp, text_info *text, const char *spec,
1496 int precision, bool wide, bool set_locus, bool hash)
1500 /* FUTURE: %+x should set the locus. */
1501 if (precision != 0 || wide || hash)
1507 t = va_arg (*text->args_ptr, tree);
1508 if (TREE_CODE (t) == IDENTIFIER_NODE)
1510 pp_identifier (pp, IDENTIFIER_POINTER (t));
1516 t = va_arg (*text->args_ptr, tree);
1517 if (DECL_DEBUG_EXPR_IS_FROM (t) && DECL_DEBUG_EXPR (t))
1518 t = DECL_DEBUG_EXPR (t);
1523 t = va_arg (*text->args_ptr, tree);
1527 percent_K_format (text);
1534 if (set_locus && text->locus)
1535 *text->locus = DECL_SOURCE_LOCATION (t);
1539 const char *n = DECL_NAME (t)
1540 ? identifier_to_locale (lang_hooks.decl_printable_name (t, 2))
1545 dump_generic_node (pp, t, 0, TDF_DIAGNOSTIC, 0);
1550 /* A helper function; used as the reallocator function for cpp's line
1553 realloc_for_line_map (void *ptr, size_t len)
1555 return GGC_RESIZEVAR (void, ptr, len);
1558 /* A helper function: used as the allocator function for
1559 identifier_to_locale. */
1561 alloc_for_identifier_to_locale (size_t len)
1563 return ggc_alloc_atomic (len);
1566 /* Initialization of the front end environment, before command line
1567 options are parsed. Signal handlers, internationalization etc.
1568 ARGV0 is main's argv[0]. */
1570 general_init (const char *argv0)
1574 p = argv0 + strlen (argv0);
1575 while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
1579 xmalloc_set_program_name (progname);
1583 /* Unlock the stdio streams. */
1584 unlock_std_streams ();
1586 gcc_init_libintl ();
1588 identifier_to_locale_alloc = alloc_for_identifier_to_locale;
1589 identifier_to_locale_free = ggc_free;
1591 /* Initialize the diagnostics reporting machinery, so option parsing
1592 can give warnings and errors. */
1593 diagnostic_initialize (global_dc, N_OPTS);
1594 diagnostic_starter (global_dc) = default_tree_diagnostic_starter;
1595 /* Set a default printer. Language specific initializations will
1596 override it later. */
1597 pp_format_decoder (global_dc->printer) = &default_tree_printer;
1598 global_dc->show_option_requested = flag_diagnostics_show_option;
1599 global_dc->show_column = flag_show_column;
1600 global_dc->internal_error = plugins_internal_error_function;
1601 global_dc->option_enabled = option_enabled;
1602 global_dc->option_name = option_name;
1604 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1606 signal (SIGSEGV, crash_signal);
1609 signal (SIGILL, crash_signal);
1612 signal (SIGBUS, crash_signal);
1615 signal (SIGABRT, crash_signal);
1617 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1618 signal (SIGIOT, crash_signal);
1621 signal (SIGFPE, crash_signal);
1624 /* Other host-specific signal setup. */
1625 (*host_hooks.extra_signals)();
1627 /* Initialize the garbage-collector, string pools and tree type hash
1631 line_table = ggc_alloc_line_maps ();
1632 linemap_init (line_table);
1633 line_table->reallocator = realloc_for_line_map;
1636 /* Initialize register usage now so switches may override. */
1639 /* Register the language-independent parameters. */
1640 add_params (lang_independent_params, LAST_PARAM);
1642 /* This must be done after add_params but before argument processing. */
1643 init_ggc_heuristics();
1644 init_optimization_passes ();
1645 statistics_early_init ();
1648 /* Return true if the current target supports -fsection-anchors. */
1651 target_supports_section_anchors_p (void)
1653 if (targetm.min_anchor_offset == 0 && targetm.max_anchor_offset == 0)
1656 if (targetm.asm_out.output_anchor == NULL)
1662 /* Default the align_* variables to 1 if they're still unset, and
1663 set up the align_*_log variables. */
1665 init_alignments (void)
1667 if (align_loops <= 0)
1669 if (align_loops_max_skip > align_loops)
1670 align_loops_max_skip = align_loops - 1;
1671 align_loops_log = floor_log2 (align_loops * 2 - 1);
1672 if (align_jumps <= 0)
1674 if (align_jumps_max_skip > align_jumps)
1675 align_jumps_max_skip = align_jumps - 1;
1676 align_jumps_log = floor_log2 (align_jumps * 2 - 1);
1677 if (align_labels <= 0)
1679 align_labels_log = floor_log2 (align_labels * 2 - 1);
1680 if (align_labels_max_skip > align_labels)
1681 align_labels_max_skip = align_labels - 1;
1682 if (align_functions <= 0)
1683 align_functions = 1;
1684 align_functions_log = floor_log2 (align_functions * 2 - 1);
1687 /* Process the options that have been parsed. */
1689 process_options (void)
1691 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1692 This can happen with incorrect pre-processed input. */
1693 debug_hooks = &do_nothing_debug_hooks;
1695 /* This replaces set_Wunused. */
1696 if (warn_unused_function == -1)
1697 warn_unused_function = warn_unused;
1698 if (warn_unused_label == -1)
1699 warn_unused_label = warn_unused;
1700 /* Wunused-parameter is enabled if both -Wunused -Wextra are enabled. */
1701 if (warn_unused_parameter == -1)
1702 warn_unused_parameter = (warn_unused && extra_warnings);
1703 if (warn_unused_variable == -1)
1704 warn_unused_variable = warn_unused;
1705 /* Wunused-but-set-parameter is enabled if both -Wunused -Wextra are
1707 if (warn_unused_but_set_parameter == -1)
1708 warn_unused_but_set_parameter = (warn_unused && extra_warnings);
1709 if (warn_unused_but_set_variable == -1)
1710 warn_unused_but_set_variable = warn_unused;
1711 if (warn_unused_value == -1)
1712 warn_unused_value = warn_unused;
1714 /* This replaces set_Wextra. */
1715 if (warn_uninitialized == -1)
1716 warn_uninitialized = extra_warnings;
1718 /* Allow the front end to perform consistency checks and do further
1719 initialization based on the command line options. This hook also
1720 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1721 so we can correctly initialize debug output. */
1722 no_backend = lang_hooks.post_options (&main_input_filename);
1724 /* Some machines may reject certain combinations of options. */
1725 targetm.target_option.override ();
1727 /* Avoid any informative notes in the second run of -fcompare-debug. */
1728 if (flag_compare_debug)
1729 diagnostic_inhibit_notes (global_dc);
1731 if (flag_section_anchors && !target_supports_section_anchors_p ())
1733 warning (OPT_fsection_anchors,
1734 "this target does not support %qs", "-fsection-anchors");
1735 flag_section_anchors = 0;
1738 if (flag_short_enums == 2)
1739 flag_short_enums = targetm.default_short_enums ();
1741 /* Set aux_base_name if not already set. */
1744 else if (main_input_filename)
1746 char *name = xstrdup (lbasename (main_input_filename));
1748 strip_off_ending (name, strlen (name));
1749 aux_base_name = name;
1752 aux_base_name = "gccaux";
1757 || flag_loop_interchange
1758 || flag_loop_strip_mine
1759 || flag_graphite_identity
1760 || flag_loop_parallelize_all)
1761 sorry ("Graphite loop optimizations cannot be used");
1764 /* Unrolling all loops implies that standard loop unrolling must also
1766 if (flag_unroll_all_loops)
1767 flag_unroll_loops = 1;
1769 /* The loop unrolling code assumes that cse will be run after loop.
1770 web and rename-registers also help when run after loop unrolling. */
1771 if (flag_rerun_cse_after_loop == AUTODETECT_VALUE)
1772 flag_rerun_cse_after_loop = flag_unroll_loops || flag_peel_loops;
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 /* If the user specifically requested variable tracking with tagging
1914 uninitialized variables, we need to turn on variable tracking.
1915 (We already determined above that variable tracking is feasible.) */
1916 if (flag_var_tracking_uninit)
1917 flag_var_tracking = 1;
1919 if (flag_var_tracking == AUTODETECT_VALUE)
1920 flag_var_tracking = optimize >= 1;
1922 if (flag_var_tracking_assignments == AUTODETECT_VALUE)
1923 flag_var_tracking_assignments = flag_var_tracking
1924 && !(flag_selective_scheduling || flag_selective_scheduling2);
1926 if (flag_var_tracking_assignments_toggle)
1927 flag_var_tracking_assignments = !flag_var_tracking_assignments;
1929 if (flag_var_tracking_assignments && !flag_var_tracking)
1930 flag_var_tracking = flag_var_tracking_assignments = -1;
1932 if (flag_var_tracking_assignments
1933 && (flag_selective_scheduling || flag_selective_scheduling2))
1934 warning (0, "var-tracking-assignments changes selective scheduling");
1936 if (flag_tree_cselim == AUTODETECT_VALUE)
1937 #ifdef HAVE_conditional_move
1938 flag_tree_cselim = 1;
1940 flag_tree_cselim = 0;
1943 /* If auxiliary info generation is desired, open the output file.
1944 This goes in the same directory as the source file--unlike
1945 all the other output files. */
1946 if (flag_gen_aux_info)
1948 aux_info_file = fopen (aux_info_file_name, "w");
1949 if (aux_info_file == 0)
1950 fatal_error ("can%'t open %s: %m", aux_info_file_name);
1953 if (! targetm.have_named_sections)
1955 if (flag_function_sections)
1957 warning (0, "-ffunction-sections not supported for this target");
1958 flag_function_sections = 0;
1960 if (flag_data_sections)
1962 warning (0, "-fdata-sections not supported for this target");
1963 flag_data_sections = 0;
1967 if (flag_function_sections && profile_flag)
1969 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
1970 flag_function_sections = 0;
1973 #ifndef HAVE_prefetch
1974 if (flag_prefetch_loop_arrays > 0)
1976 warning (0, "-fprefetch-loop-arrays not supported for this target");
1977 flag_prefetch_loop_arrays = 0;
1980 if (flag_prefetch_loop_arrays > 0 && !HAVE_prefetch)
1982 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
1983 flag_prefetch_loop_arrays = 0;
1987 /* This combination of options isn't handled for i386 targets and doesn't
1988 make much sense anyway, so don't allow it. */
1989 if (flag_prefetch_loop_arrays > 0 && optimize_size)
1991 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
1992 flag_prefetch_loop_arrays = 0;
1995 /* The presence of IEEE signaling NaNs, implies all math can trap. */
1996 if (flag_signaling_nans)
1997 flag_trapping_math = 1;
1999 /* We cannot reassociate if we want traps or signed zeros. */
2000 if (flag_associative_math && (flag_trapping_math || flag_signed_zeros))
2002 warning (0, "-fassociative-math disabled; other options take precedence");
2003 flag_associative_math = 0;
2006 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
2007 if (flag_cx_limited_range)
2008 flag_complex_method = 0;
2010 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
2011 if (flag_cx_fortran_rules)
2012 flag_complex_method = 1;
2014 /* Targets must be able to place spill slots at lower addresses. If the
2015 target already uses a soft frame pointer, the transition is trivial. */
2016 if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
2018 warning (0, "-fstack-protector not supported for this target");
2019 flag_stack_protect = 0;
2021 if (!flag_stack_protect)
2022 warn_stack_protect = 0;
2024 /* ??? Unwind info is not correct around the CFG unless either a frame
2025 pointer is present or A_O_A is set. Fixing this requires rewriting
2026 unwind info generation to be aware of the CFG and propagating states
2028 if (flag_unwind_tables && !ACCUMULATE_OUTGOING_ARGS
2029 && flag_omit_frame_pointer)
2031 warning (0, "unwind tables currently require a frame pointer "
2033 flag_omit_frame_pointer = 0;
2036 /* Save the current optimization options. */
2037 optimization_default_node = build_optimization_node ();
2038 optimization_current_node = optimization_default_node;
2041 /* This function can be called multiple times to reinitialize the compiler
2042 back end when register classes or instruction sets have changed,
2043 before each function. */
2045 backend_init_target (void)
2047 /* Initialize alignment variables. */
2050 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
2051 to initialize reg_raw_mode[]. */
2054 /* This invokes target hooks to set fixed_reg[] etc, which is
2058 /* This depends on stack_pointer_rtx. */
2059 init_fake_stack_mems ();
2061 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
2063 init_alias_target ();
2065 /* Depends on HARD_FRAME_POINTER_REGNUM. */
2068 /* The following initialization functions need to generate rtl, so
2069 provide a dummy function context for them. */
2070 init_dummy_function_start ();
2072 /* rtx_cost is mode-dependent, so cached values need to be recomputed
2073 on a mode change. */
2076 /* We may need to recompute regno_save_code[] and regno_restore_code[]
2077 after a mode change as well. */
2078 caller_save_initialized_p = false;
2080 expand_dummy_function_end ();
2083 /* Initialize the compiler back end. This function is called only once,
2084 when starting the compiler. */
2091 init_inline_once ();
2092 init_varasm_once ();
2093 save_register_info ();
2095 /* Initialize the target-specific back end pieces. */
2097 backend_init_target ();
2100 /* Initialize excess precision settings. */
2102 init_excess_precision (void)
2104 /* Adjust excess precision handling based on the target options. If
2105 the front end cannot handle it, flag_excess_precision_cmdline
2106 will already have been set accordingly in the post_options
2108 gcc_assert (flag_excess_precision_cmdline != EXCESS_PRECISION_DEFAULT);
2109 flag_excess_precision = flag_excess_precision_cmdline;
2110 if (flag_unsafe_math_optimizations)
2111 flag_excess_precision = EXCESS_PRECISION_FAST;
2112 if (flag_excess_precision == EXCESS_PRECISION_STANDARD)
2114 int flt_eval_method = TARGET_FLT_EVAL_METHOD;
2115 switch (flt_eval_method)
2119 /* Either the target acts unpredictably (-1) or has all the
2120 operations required not to have excess precision (0). */
2121 flag_excess_precision = EXCESS_PRECISION_FAST;
2125 /* In these cases, predictable excess precision makes
2129 /* Any other implementation-defined FLT_EVAL_METHOD values
2130 require the compiler to handle the associated excess
2131 precision rules in excess_precision_type. */
2137 /* Initialize things that are both lang-dependent and target-dependent.
2138 This function can be called more than once if target parameters change. */
2140 lang_dependent_init_target (void)
2142 /* This determines excess precision settings. */
2143 init_excess_precision ();
2145 /* This creates various _DECL nodes, so needs to be called after the
2146 front end is initialized. It also depends on the HAVE_xxx macros
2147 generated from the target machine description. */
2150 /* The following initialization functions need to generate rtl, so
2151 provide a dummy function context for them. */
2152 init_dummy_function_start ();
2154 /* Do the target-specific parts of expr initialization. */
2155 init_expr_target ();
2157 /* Although the actions of these functions are language-independent,
2158 they use optabs, so we cannot call them from backend_init. */
2162 expand_dummy_function_end ();
2165 /* Language-dependent initialization. Returns nonzero on success. */
2167 lang_dependent_init (const char *name)
2169 location_t save_loc = input_location;
2170 if (dump_base_name == 0)
2171 dump_base_name = name && name[0] ? name : "gccdump";
2173 /* Other front-end initialization. */
2174 input_location = BUILTINS_LOCATION;
2175 if (lang_hooks.init () == 0)
2177 input_location = save_loc;
2179 init_asm_output (name);
2181 /* This creates various _DECL nodes, so needs to be called after the
2182 front end is initialized. */
2185 /* Do the target-specific parts of the initialization. */
2186 lang_dependent_init_target ();
2188 /* If dbx symbol table desired, initialize writing it and output the
2189 predefined types. */
2190 timevar_push (TV_SYMOUT);
2192 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
2193 if (dwarf2out_do_frame ())
2194 dwarf2out_frame_init ();
2197 /* Now we have the correct original filename, we can initialize
2199 (*debug_hooks->init) (name);
2201 timevar_pop (TV_SYMOUT);
2207 /* Reinitialize everything when target parameters, such as register usage,
2210 target_reinit (void)
2212 /* Reinitialize RTL backend. */
2213 backend_init_target ();
2215 /* Reinitialize lang-dependent parts. */
2216 lang_dependent_init_target ();
2220 dump_memory_report (bool final)
2222 ggc_print_statistics ();
2223 stringpool_statistics ();
2224 dump_tree_statistics ();
2225 dump_gimple_statistics ();
2226 dump_rtx_statistics ();
2227 dump_alloc_pool_statistics ();
2228 dump_bitmap_statistics ();
2229 dump_vec_loc_statistics ();
2230 dump_ggc_loc_statistics (final);
2231 dump_alias_stats (stderr);
2232 dump_pta_stats (stderr);
2235 /* Clean up: close opened files, etc. */
2240 /* Close the dump files. */
2241 if (flag_gen_aux_info)
2243 fclose (aux_info_file);
2245 unlink (aux_info_file_name);
2248 /* Close non-debugging input and output files. Take special care to note
2249 whether fclose returns an error, since the pages might still be on the
2250 buffer chain while the file is open. */
2254 if (ferror (asm_out_file) != 0)
2255 fatal_error ("error writing to %s: %m", asm_file_name);
2256 if (fclose (asm_out_file) != 0)
2257 fatal_error ("error closing %s: %m", asm_file_name);
2259 unlink_if_ordinary (asm_file_name);
2263 finish_optimization_passes ();
2268 dump_memory_report (true);
2270 /* Language-specific end of compilation actions. */
2271 lang_hooks.finish ();
2274 /* Initialize the compiler, and compile the input file. */
2278 /* Initialize timing first. The C front ends read the main file in
2279 the post_options hook, and C++ does file timings. */
2280 if (time_report || !quiet_flag || flag_detailed_statistics)
2282 timevar_start (TV_TOTAL);
2286 /* Don't do any more if an error has already occurred. */
2289 /* This must be run always, because it is needed to compute the FP
2290 predefined macros, such as __LDBL_MAX__, for targets using non
2291 default FP formats. */
2292 init_adjust_machine_modes ();
2294 /* Set up the back-end if requested. */
2298 /* Language-dependent initialization. Returns true on success. */
2299 if (lang_dependent_init (main_input_filename))
2305 /* Stop timing and print the times. */
2306 timevar_stop (TV_TOTAL);
2307 timevar_print (stderr);
2310 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2311 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2312 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2314 It is not safe to call this function more than once. */
2317 toplev_main (int argc, char **argv)
2319 expandargv (&argc, &argv);
2321 /* Initialization of GCC's environment, and diagnostics. */
2322 general_init (argv[0]);
2324 /* Parse the options and do minimal processing; basically just
2325 enough to default flags appropriately. */
2326 decode_options (argc, CONST_CAST2 (const char **, char **, argv),
2327 &save_decoded_options, &save_decoded_options_count);
2331 initialize_plugins ();
2334 print_version (stderr, "");
2337 print_plugins_help (stderr, "");
2339 /* Exit early if we can (e.g. -help). */
2340 if (!exit_after_options)
2343 if (warningcount || errorcount)
2344 print_ignored_options ();
2345 diagnostic_finish (global_dc);
2347 /* Invoke registered plugin callbacks if any. */
2348 invoke_plugin_callbacks (PLUGIN_FINISH, NULL);
2350 finalize_plugins ();
2352 return (FATAL_EXIT_CODE);
2354 return (SUCCESS_EXIT_CODE);