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
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /* This is the top level of cc1/c++.
23 It parses command args, opens files, invokes the various passes
24 in the proper order, and counts the time used by each.
25 Error messages and low-level interface to malloc also handled here. */
28 #undef FLOAT /* This is for hpux. They should change hpux. */
29 #undef FFS /* Some systems define this in param.h. */
31 #include "coretypes.h"
35 #ifdef HAVE_SYS_RESOURCE_H
36 # include <sys/resource.h>
39 #ifdef HAVE_SYS_TIMES_H
40 # include <sys/times.h>
50 #include "insn-attr.h"
51 #include "insn-config.h"
52 #include "insn-flags.h"
53 #include "hard-reg-set.h"
60 #include "basic-block.h"
66 #include "diagnostic.h"
70 #include "dwarf2asm.h"
71 #include "integrate.h"
75 #include "langhooks.h"
76 #include "cfglayout.h"
78 #include "hosthooks.h"
82 #include "value-prof.h"
83 #include "alloc-pool.h"
84 #include "tree-mudflap.h"
85 #include "tree-pass.h"
87 #include "tree-ssa-alias.h"
90 #if defined (DWARF2_UNWIND_INFO) || defined (DWARF2_DEBUGGING_INFO)
91 #include "dwarf2out.h"
94 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
98 #ifdef SDB_DEBUGGING_INFO
102 #ifdef XCOFF_DEBUGGING_INFO
103 #include "xcoffout.h" /* Needed for external data
104 declarations for e.g. AIX 4.x. */
107 static void general_init (const char *);
108 static void do_compile (void);
109 static void process_options (void);
110 static void backend_init (void);
111 static int lang_dependent_init (const char *);
112 static void init_asm_output (const char *);
113 static void finalize (void);
115 static void crash_signal (int) ATTRIBUTE_NORETURN
;
116 static void setup_core_dumping (void);
117 static void compile_file (void);
119 /* Nonzero to dump debug info whilst parsing (-dy option). */
120 static int set_yydebug
;
122 /* True if we don't need a backend (e.g. preprocessing only). */
123 static bool no_backend
;
125 /* Length of line when printing switch values. */
128 /* Name of program invoked, sans directories. */
130 const char *progname
;
132 /* Copy of argument vector to toplev_main. */
133 static const char **save_argv
;
135 /* Name of top-level original source file (what was input to cpp).
136 This comes from the #-command at the beginning of the actual input.
137 If there isn't any there, then this is the cc1 input file name. */
139 const char *main_input_filename
;
141 /* Used to enable -fvar-tracking, -fweb and -frename-registers according
142 to optimize and default_debug_hooks in process_options (). */
143 #define AUTODETECT_VALUE 2
145 /* Current position in real source file. */
147 location_t input_location
;
149 struct line_maps
*line_table
;
151 /* Name to use as base of names for dump output files. */
153 const char *dump_base_name
;
155 /* Name to use as a base for auxiliary output files. */
157 const char *aux_base_name
;
159 /* Prefix for profile data files */
160 const char *profile_data_prefix
;
162 /* A mask of target_flags that includes bit X if X was set or cleared
163 on the command line. */
165 int target_flags_explicit
;
167 /* Debug hooks - dependent upon command line options. */
169 const struct gcc_debug_hooks
*debug_hooks
;
171 /* Debug hooks - target default. */
173 static const struct gcc_debug_hooks
*default_debug_hooks
;
175 /* Other flags saying which kinds of debugging dump have been requested. */
177 int rtl_dump_and_exit
;
178 int flag_print_asm_name
;
179 enum graph_dump_types graph_dump_format
;
181 /* Name for output file of assembly code, specified with -o. */
183 const char *asm_file_name
;
185 /* Nonzero means do optimizations. -O.
186 Particular numeric values stand for particular amounts of optimization;
187 thus, -O2 stores 2 here. However, the optimizations beyond the basic
188 ones are not controlled directly by this variable. Instead, they are
189 controlled by individual `flag_...' variables that are defaulted
190 based on this variable. */
194 /* Nonzero means optimize for size. -Os.
195 The only valid values are zero and nonzero. When optimize_size is
196 nonzero, optimize defaults to 2, but certain individual code
197 bloating optimizations are disabled. */
199 int optimize_size
= 0;
201 /* The FUNCTION_DECL for the function currently being compiled,
202 or 0 if between functions. */
203 tree current_function_decl
;
205 /* Set to the FUNC_BEGIN label of the current function, or NULL
207 const char * current_function_func_begin_label
;
209 /* Nonzero means to collect statistics which might be expensive
210 and to print them when we are done. */
211 int flag_detailed_statistics
= 0;
213 /* A random sequence of characters, unless overridden by user. */
214 static const char *flag_random_seed
;
216 /* A local time stamp derived from the time of compilation. It will be
217 zero if the system cannot provide a time. It will be -1u, if the
218 user has specified a particular random seed. */
223 /* Nonzero means `char' should be signed. */
225 int flag_signed_char
;
227 /* Nonzero means give an enum type only as many bytes as it needs. A value
228 of 2 means it has not yet been initialized. */
230 int flag_short_enums
;
232 /* Nonzero if structures and unions should be returned in memory.
234 This should only be defined if compatibility with another compiler or
235 with an ABI is needed, because it results in slower code. */
237 #ifndef DEFAULT_PCC_STRUCT_RETURN
238 #define DEFAULT_PCC_STRUCT_RETURN 1
241 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
243 int flag_pcc_struct_return
= DEFAULT_PCC_STRUCT_RETURN
;
245 /* 0 means straightforward implementation of complex divide acceptable.
246 1 means wide ranges of inputs must work for complex divide.
247 2 means C99-like requirements for complex multiply and divide. */
249 int flag_complex_method
= 1;
251 /* Nonzero means we should be saving declaration info into a .X file. */
253 int flag_gen_aux_info
= 0;
255 /* Specified name of aux-info file. */
257 const char *aux_info_file_name
;
259 /* Nonzero if we are compiling code for a shared library, zero for
264 /* Generate code for GNU or NeXT Objective-C runtime environment. */
266 #ifdef NEXT_OBJC_RUNTIME
267 int flag_next_runtime
= 1;
269 int flag_next_runtime
= 0;
272 /* Set to the default thread-local storage (tls) model to use. */
274 enum tls_model flag_tls_default
= TLS_MODEL_GLOBAL_DYNAMIC
;
276 /* Set the default region and algorithm for the integrated register
279 enum ira_algorithm flag_ira_algorithm
= IRA_ALGORITHM_CB
;
280 enum ira_region flag_ira_region
= IRA_REGION_MIXED
;
282 /* Set the default value for -fira-verbose. */
284 unsigned int flag_ira_verbose
= 5;
286 /* Set the default for excess precision. */
288 enum excess_precision flag_excess_precision_cmdline
= EXCESS_PRECISION_DEFAULT
;
289 enum excess_precision flag_excess_precision
= EXCESS_PRECISION_DEFAULT
;
291 /* Nonzero means change certain warnings into errors.
292 Usually these are warnings about failure to conform to some standard. */
294 int flag_pedantic_errors
= 0;
296 /* Nonzero means make permerror produce warnings instead of errors. */
298 int flag_permissive
= 0;
300 /* -dA causes debug commentary information to be produced in
301 the generated assembly code (to make it more readable). This option
302 is generally only of use to those who actually need to read the
303 generated assembly code (perhaps while debugging the compiler itself).
304 Currently, this switch is only used by dwarfout.c; however, it is intended
305 to be a catchall for printing debug information in the assembler file. */
307 int flag_debug_asm
= 0;
309 /* -dP causes the rtl to be emitted as a comment in assembly. */
311 int flag_dump_rtl_in_asm
= 0;
313 /* When non-NULL, indicates that whenever space is allocated on the
314 stack, the resulting stack pointer must not pass this
315 address---that is, for stacks that grow downward, the stack pointer
316 must always be greater than or equal to this address; for stacks
317 that grow upward, the stack pointer must be less than this address.
318 At present, the rtx may be either a REG or a SYMBOL_REF, although
319 the support provided depends on the backend. */
322 /* Positive if we should track variables, negative if we should run
323 the var-tracking pass only to discard debug annotations, zero if
324 we're not to run it. When flag_var_tracking == AUTODETECT_VALUE it
325 will be set according to optimize, debug_info_level and debug_hooks
326 in process_options (). */
327 int flag_var_tracking
= AUTODETECT_VALUE
;
329 /* Positive if we should track variables at assignments, negative if
330 we should run the var-tracking pass only to discard debug
331 annotations. When flag_var_tracking_assignments ==
332 AUTODETECT_VALUE it will be set according to flag_var_tracking. */
333 int flag_var_tracking_assignments
= AUTODETECT_VALUE
;
335 /* Nonzero if we should toggle flag_var_tracking_assignments after
336 processing options and computing its default. */
337 int flag_var_tracking_assignments_toggle
= 0;
339 /* Type of stack check. */
340 enum stack_check_type flag_stack_check
= NO_STACK_CHECK
;
342 /* True if the user has tagged the function with the 'section'
345 bool user_defined_section_attribute
= false;
347 /* Values of the -falign-* flags: how much to align labels in code.
348 0 means `use default', 1 means `don't align'.
349 For each variable, there is an _log variant which is the power
350 of two not less than the variable, for .align output. */
353 int align_loops_max_skip
;
355 int align_jumps_max_skip
;
356 int align_labels_log
;
357 int align_labels_max_skip
;
358 int align_functions_log
;
362 const char *const string
;
366 lang_independent_options
;
368 /* Nonzero if subexpressions must be evaluated from left-to-right. */
369 int flag_evaluation_order
= 0;
371 /* The user symbol prefix after having resolved same. */
372 const char *user_label_prefix
;
374 static const param_info lang_independent_params
[] = {
375 #define DEFPARAM(ENUM, OPTION, HELP, DEFAULT, MIN, MAX) \
376 { OPTION, DEFAULT, false, MIN, MAX, HELP },
377 #include "params.def"
379 { NULL
, 0, false, 0, 0, NULL
}
382 /* Output files for assembler code (real compiler output)
383 and debugging dumps. */
387 FILE *dump_file
= NULL
;
388 const char *dump_file_name
;
390 /* The current working directory of a translation. It's generally the
391 directory from which compilation was initiated, but a preprocessed
392 file may specify the original directory in which it was
395 static const char *src_pwd
;
397 /* Initialize src_pwd with the given string, and return true. If it
398 was already initialized, return false. As a special case, it may
399 be called with a NULL argument to test whether src_pwd has NOT been
403 set_src_pwd (const char *pwd
)
407 if (strcmp (src_pwd
, pwd
) == 0)
413 src_pwd
= xstrdup (pwd
);
417 /* Return the directory from which the translation unit was initiated,
418 in case set_src_pwd() was not called before to assign it a
434 /* Called when the start of a function definition is parsed,
435 this function prints on stderr the name of the function. */
437 announce_function (tree decl
)
441 if (rtl_dump_and_exit
)
442 fprintf (stderr
, "%s ",
443 identifier_to_locale (IDENTIFIER_POINTER (DECL_NAME (decl
))));
445 fprintf (stderr
, " %s",
446 identifier_to_locale (lang_hooks
.decl_printable_name (decl
, 2)));
448 pp_needs_newline (global_dc
->printer
) = true;
449 diagnostic_set_last_function (global_dc
, (diagnostic_info
*) NULL
);
453 /* Initialize local_tick with the time of day, or -1 if
454 flag_random_seed is set. */
457 init_local_tick (void)
459 if (!flag_random_seed
)
461 /* Get some more or less random data. */
462 #ifdef HAVE_GETTIMEOFDAY
466 gettimeofday (&tv
, NULL
);
467 local_tick
= tv
.tv_sec
* 1000 + tv
.tv_usec
/ 1000;
471 time_t now
= time (NULL
);
473 if (now
!= (time_t)-1)
474 local_tick
= (unsigned) now
;
482 /* Set up a default flag_random_seed and local_tick, unless the user
483 already specified one. Must be called after init_local_tick. */
486 init_random_seed (void)
488 unsigned HOST_WIDE_INT value
;
489 static char random_seed
[HOST_BITS_PER_WIDE_INT
/ 4 + 3];
491 value
= local_tick
^ getpid ();
493 sprintf (random_seed
, HOST_WIDE_INT_PRINT_HEX
, value
);
494 flag_random_seed
= random_seed
;
497 /* Obtain the random_seed string. Unless NOINIT, initialize it if
498 it's not provided in the command line. */
501 get_random_seed (bool noinit
)
503 if (!flag_random_seed
&& !noinit
)
505 return flag_random_seed
;
508 /* Modify the random_seed string to VAL. Return its previous
512 set_random_seed (const char *val
)
514 const char *old
= flag_random_seed
;
515 flag_random_seed
= val
;
519 /* Decode the string P as an integral parameter.
520 If the string is indeed an integer return its numeric value else
521 issue an Invalid Option error for the option PNAME and return DEFVAL.
522 If PNAME is zero just return DEFVAL, do not call error. */
525 read_integral_parameter (const char *p
, const char *pname
, const int defval
)
527 const char *endp
= p
;
540 error ("invalid option argument %qs", pname
);
547 #if GCC_VERSION < 3004
549 /* The functions floor_log2 and exact_log2 are defined as inline
550 functions in toplev.h if GCC_VERSION >= 3004. The definitions here
551 are used for older versions of gcc. */
553 /* Given X, an unsigned number, return the largest int Y such that 2**Y <= X.
554 If X is 0, return -1. */
557 floor_log2 (unsigned HOST_WIDE_INT x
)
564 if (HOST_BITS_PER_WIDE_INT
> 64)
565 if (x
>= (unsigned HOST_WIDE_INT
) 1 << (t
+ 64))
567 if (HOST_BITS_PER_WIDE_INT
> 32)
568 if (x
>= ((unsigned HOST_WIDE_INT
) 1) << (t
+ 32))
570 if (x
>= ((unsigned HOST_WIDE_INT
) 1) << (t
+ 16))
572 if (x
>= ((unsigned HOST_WIDE_INT
) 1) << (t
+ 8))
574 if (x
>= ((unsigned HOST_WIDE_INT
) 1) << (t
+ 4))
576 if (x
>= ((unsigned HOST_WIDE_INT
) 1) << (t
+ 2))
578 if (x
>= ((unsigned HOST_WIDE_INT
) 1) << (t
+ 1))
584 /* Return the logarithm of X, base 2, considering X unsigned,
585 if X is a power of 2. Otherwise, returns -1. */
588 exact_log2 (unsigned HOST_WIDE_INT x
)
592 return floor_log2 (x
);
595 #endif /* GCC_VERSION < 3004 */
597 /* Handler for fatal signals, such as SIGSEGV. These are transformed
598 into ICE messages, which is much more user friendly. In case the
599 error printer crashes, reset the signal to prevent infinite recursion. */
602 crash_signal (int signo
)
604 signal (signo
, SIG_DFL
);
606 /* If we crashed while processing an ASM statement, then be a little more
607 graceful. It's most likely the user's fault. */
608 if (this_is_asm_operands
)
610 output_operand_lossage ("unrecoverable error");
611 exit (FATAL_EXIT_CODE
);
614 internal_error ("%s", strsignal (signo
));
617 /* Arrange to dump core on error. (The regular error message is still
618 printed first, except in the case of abort().) */
621 setup_core_dumping (void)
624 signal (SIGABRT
, SIG_DFL
);
626 #if defined(HAVE_SETRLIMIT)
629 if (getrlimit (RLIMIT_CORE
, &rlim
) != 0)
630 fatal_error ("getting core file size maximum limit: %m");
631 rlim
.rlim_cur
= rlim
.rlim_max
;
632 if (setrlimit (RLIMIT_CORE
, &rlim
) != 0)
633 fatal_error ("setting core file size limit to maximum: %m");
636 diagnostic_abort_on_error (global_dc
);
640 /* Strip off a legitimate source ending from the input string NAME of
641 length LEN. Rather than having to know the names used by all of
642 our front ends, we strip off an ending of a period followed by
643 up to five characters. (Java uses ".class".) */
646 strip_off_ending (char *name
, int len
)
649 for (i
= 2; i
< 6 && len
> i
; i
++)
651 if (name
[len
- i
] == '.')
653 name
[len
- i
] = '\0';
659 /* Output a quoted string. */
662 output_quoted_string (FILE *asm_file
, const char *string
)
664 #ifdef OUTPUT_QUOTED_STRING
665 OUTPUT_QUOTED_STRING (asm_file
, string
);
669 putc ('\"', asm_file
);
670 while ((c
= *string
++) != 0)
674 if (c
== '\"' || c
== '\\')
675 putc ('\\', asm_file
);
679 fprintf (asm_file
, "\\%03o", (unsigned char) c
);
681 putc ('\"', asm_file
);
685 /* Output a file name in the form wanted by System V. */
688 output_file_directive (FILE *asm_file
, const char *input_name
)
693 if (input_name
== NULL
)
694 input_name
= "<stdin>";
696 input_name
= remap_debug_filename (input_name
);
698 len
= strlen (input_name
);
699 na
= input_name
+ len
;
701 /* NA gets INPUT_NAME sans directory names. */
702 while (na
> input_name
)
704 if (IS_DIR_SEPARATOR (na
[-1]))
709 #ifdef ASM_OUTPUT_SOURCE_FILENAME
710 ASM_OUTPUT_SOURCE_FILENAME (asm_file
, na
);
712 fprintf (asm_file
, "\t.file\t");
713 output_quoted_string (asm_file
, na
);
714 putc ('\n', asm_file
);
718 /* A subroutine of wrapup_global_declarations. We've come to the end of
719 the compilation unit. All deferred variables should be undeferred,
720 and all incomplete decls should be finalized. */
723 wrapup_global_declaration_1 (tree decl
)
725 /* We're not deferring this any longer. Assignment is conditional to
726 avoid needlessly dirtying PCH pages. */
727 if (CODE_CONTAINS_STRUCT (TREE_CODE (decl
), TS_DECL_WITH_VIS
)
728 && DECL_DEFER_OUTPUT (decl
) != 0)
729 DECL_DEFER_OUTPUT (decl
) = 0;
731 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_SIZE (decl
) == 0)
732 lang_hooks
.finish_incomplete_decl (decl
);
735 /* A subroutine of wrapup_global_declarations. Decide whether or not DECL
736 needs to be output. Return true if it is output. */
739 wrapup_global_declaration_2 (tree decl
)
741 if (TREE_ASM_WRITTEN (decl
) || DECL_EXTERNAL (decl
))
744 /* Don't write out static consts, unless we still need them.
746 We also keep static consts if not optimizing (for debugging),
747 unless the user specified -fno-keep-static-consts.
748 ??? They might be better written into the debug information.
749 This is possible when using DWARF.
751 A language processor that wants static constants to be always
752 written out (even if it is not used) is responsible for
753 calling rest_of_decl_compilation itself. E.g. the C front-end
754 calls rest_of_decl_compilation from finish_decl.
755 One motivation for this is that is conventional in some
756 environments to write things like:
757 static const char rcsid[] = "... version string ...";
758 intending to force the string to be in the executable.
760 A language processor that would prefer to have unneeded
761 static constants "optimized away" would just defer writing
762 them out until here. E.g. C++ does this, because static
763 constants are often defined in header files.
765 ??? A tempting alternative (for both C and C++) would be
766 to force a constant to be written if and only if it is
767 defined in a main file, as opposed to an include file. */
769 if (TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
771 struct varpool_node
*node
;
773 node
= varpool_node (decl
);
777 else if (node
->alias
)
779 else if (!cgraph_global_info_ready
781 || TREE_USED (DECL_ASSEMBLER_NAME (decl
))))
783 else if (node
->needed
)
785 else if (DECL_COMDAT (decl
))
787 else if (TREE_READONLY (decl
) && !TREE_PUBLIC (decl
)
788 && (optimize
|| !flag_keep_static_consts
789 || DECL_ARTIFICIAL (decl
)))
794 rest_of_decl_compilation (decl
, 1, 1);
802 /* Do any final processing required for the declarations in VEC, of
803 which there are LEN. We write out inline functions and variables
804 that have been deferred until this point, but which are required.
805 Returns nonzero if anything was put out. */
808 wrapup_global_declarations (tree
*vec
, int len
)
810 bool reconsider
, output_something
= false;
813 for (i
= 0; i
< len
; i
++)
814 wrapup_global_declaration_1 (vec
[i
]);
816 /* Now emit any global variables or functions that we have been
817 putting off. We need to loop in case one of the things emitted
818 here references another one which comes earlier in the list. */
822 for (i
= 0; i
< len
; i
++)
823 reconsider
|= wrapup_global_declaration_2 (vec
[i
]);
825 output_something
= true;
829 return output_something
;
832 /* A subroutine of check_global_declarations. Issue appropriate warnings
833 for the global declaration DECL. */
836 check_global_declaration_1 (tree decl
)
838 /* Warn about any function declared static but not defined. We don't
839 warn about variables, because many programs have static variables
840 that exist only to get some text into the object file. */
841 if (TREE_CODE (decl
) == FUNCTION_DECL
842 && DECL_INITIAL (decl
) == 0
843 && DECL_EXTERNAL (decl
)
844 && ! DECL_ARTIFICIAL (decl
)
845 && ! TREE_NO_WARNING (decl
)
846 && ! TREE_PUBLIC (decl
)
847 && (warn_unused_function
848 || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))))
850 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
851 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
853 warning (OPT_Wunused_function
, "%q+F declared %<static%> but never defined", decl
);
854 /* This symbol is effectively an "extern" declaration now. */
855 TREE_PUBLIC (decl
) = 1;
856 assemble_external (decl
);
859 /* Warn about static fns or vars defined but not used. */
860 if (((warn_unused_function
&& TREE_CODE (decl
) == FUNCTION_DECL
)
861 /* We don't warn about "static const" variables because the
862 "rcs_id" idiom uses that construction. */
863 || (warn_unused_variable
864 && TREE_CODE (decl
) == VAR_DECL
&& ! TREE_READONLY (decl
)))
865 && ! DECL_IN_SYSTEM_HEADER (decl
)
866 && ! TREE_USED (decl
)
867 /* The TREE_USED bit for file-scope decls is kept in the identifier,
868 to handle multiple external decls in different scopes. */
869 && ! (DECL_NAME (decl
) && TREE_USED (DECL_NAME (decl
)))
870 && ! DECL_EXTERNAL (decl
)
871 && ! TREE_PUBLIC (decl
)
872 /* A volatile variable might be used in some non-obvious way. */
873 && ! TREE_THIS_VOLATILE (decl
)
874 /* Global register variables must be declared to reserve them. */
875 && ! (TREE_CODE (decl
) == VAR_DECL
&& DECL_REGISTER (decl
))
876 /* Otherwise, ask the language. */
877 && lang_hooks
.decls
.warn_unused_global (decl
))
878 warning ((TREE_CODE (decl
) == FUNCTION_DECL
)
879 ? OPT_Wunused_function
880 : OPT_Wunused_variable
,
881 "%q+D defined but not used", decl
);
884 /* Issue appropriate warnings for the global declarations in VEC (of
885 which there are LEN). */
888 check_global_declarations (tree
*vec
, int len
)
892 for (i
= 0; i
< len
; i
++)
893 check_global_declaration_1 (vec
[i
]);
896 /* Emit debugging information for all global declarations in VEC. */
899 emit_debug_global_declarations (tree
*vec
, int len
)
903 /* Avoid confusing the debug information machinery when there are errors. */
904 if (errorcount
!= 0 || sorrycount
!= 0)
907 timevar_push (TV_SYMOUT
);
908 for (i
= 0; i
< len
; i
++)
909 debug_hooks
->global_decl (vec
[i
]);
910 timevar_pop (TV_SYMOUT
);
913 /* Warn about a use of an identifier which was marked deprecated. */
915 warn_deprecated_use (tree node
, tree attr
)
919 if (node
== 0 || !warn_deprecated_decl
)
925 attr
= DECL_ATTRIBUTES (node
);
926 else if (TYPE_P (node
))
928 tree decl
= TYPE_STUB_DECL (node
);
930 attr
= lookup_attribute ("deprecated",
931 TYPE_ATTRIBUTES (TREE_TYPE (decl
)));
936 attr
= lookup_attribute ("deprecated", attr
);
939 msg
= TREE_STRING_POINTER (TREE_VALUE (TREE_VALUE (attr
)));
945 expanded_location xloc
= expand_location (DECL_SOURCE_LOCATION (node
));
947 warning (OPT_Wdeprecated_declarations
,
948 "%qD is deprecated (declared at %s:%d): %s",
949 node
, xloc
.file
, xloc
.line
, msg
);
951 warning (OPT_Wdeprecated_declarations
,
952 "%qD is deprecated (declared at %s:%d)",
953 node
, xloc
.file
, xloc
.line
);
955 else if (TYPE_P (node
))
957 tree what
= NULL_TREE
;
958 tree decl
= TYPE_STUB_DECL (node
);
960 if (TYPE_NAME (node
))
962 if (TREE_CODE (TYPE_NAME (node
)) == IDENTIFIER_NODE
)
963 what
= TYPE_NAME (node
);
964 else if (TREE_CODE (TYPE_NAME (node
)) == TYPE_DECL
965 && DECL_NAME (TYPE_NAME (node
)))
966 what
= DECL_NAME (TYPE_NAME (node
));
971 expanded_location xloc
972 = expand_location (DECL_SOURCE_LOCATION (decl
));
976 warning (OPT_Wdeprecated_declarations
,
977 "%qE is deprecated (declared at %s:%d): %s",
978 what
, xloc
.file
, xloc
.line
, msg
);
980 warning (OPT_Wdeprecated_declarations
,
981 "%qE is deprecated (declared at %s:%d)", what
,
982 xloc
.file
, xloc
.line
);
987 warning (OPT_Wdeprecated_declarations
,
988 "type is deprecated (declared at %s:%d): %s",
989 xloc
.file
, xloc
.line
, msg
);
991 warning (OPT_Wdeprecated_declarations
,
992 "type is deprecated (declared at %s:%d)",
993 xloc
.file
, xloc
.line
);
1001 warning (OPT_Wdeprecated_declarations
, "%qE is deprecated: %s",
1004 warning (OPT_Wdeprecated_declarations
, "%qE is deprecated", what
);
1009 warning (OPT_Wdeprecated_declarations
, "type is deprecated: %s",
1012 warning (OPT_Wdeprecated_declarations
, "type is deprecated");
1018 /* Compile an entire translation unit. Write a file of assembly
1019 output and various debugging dumps. */
1024 /* Initialize yet another pass. */
1026 ggc_protect_identifiers
= true;
1029 init_final (main_input_filename
);
1030 coverage_init (aux_base_name
);
1032 invoke_plugin_callbacks (PLUGIN_START_UNIT
, NULL
);
1034 timevar_push (TV_PARSE
);
1036 /* Call the parser, which parses the entire file (calling
1037 rest_of_compilation for each function). */
1038 lang_hooks
.parse_file (set_yydebug
);
1040 /* Compilation is now finished except for writing
1041 what's left of the symbol table output. */
1042 timevar_pop (TV_PARSE
);
1044 if (flag_syntax_only
)
1047 ggc_protect_identifiers
= false;
1049 /* This must also call cgraph_finalize_compilation_unit. */
1050 lang_hooks
.decls
.final_write_globals ();
1052 if (errorcount
|| sorrycount
)
1055 varpool_assemble_pending_decls ();
1056 finish_aliases_2 ();
1058 /* Likewise for mudflap static object registrations. */
1060 mudflap_finish_file ();
1062 /* Likewise for emulated thread-local storage. */
1063 if (!targetm
.have_tls
)
1066 output_shared_constant_pool ();
1067 output_object_blocks ();
1069 /* Write out any pending weak symbol declarations. */
1072 /* Do dbx symbols. */
1073 timevar_push (TV_SYMOUT
);
1075 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
1076 if (dwarf2out_do_frame ())
1077 dwarf2out_frame_finish ();
1080 (*debug_hooks
->finish
) (main_input_filename
);
1081 timevar_pop (TV_SYMOUT
);
1083 /* Output some stuff at end of file if nec. */
1085 dw2_output_indirect_constants ();
1087 /* Flush any pending external directives. */
1088 process_pending_assemble_externals ();
1090 /* Attach a special .ident directive to the end of the file to identify
1091 the version of GCC which compiled this code. The format of the .ident
1092 string is patterned after the ones produced by native SVR4 compilers. */
1096 const char *pkg_version
= "(GNU) ";
1098 if (strcmp ("(GCC) ", pkgversion_string
))
1099 pkg_version
= pkgversion_string
;
1100 fprintf (asm_out_file
, "%s\"GCC: %s%s\"\n",
1101 IDENT_ASM_OP
, pkg_version
, version_string
);
1105 /* Invoke registered plugin callbacks. */
1106 invoke_plugin_callbacks (PLUGIN_FINISH_UNIT
, NULL
);
1108 /* This must be at the end. Some target ports emit end of file directives
1109 into the assembly file here, and hence we can not output anything to the
1110 assembly file after this point. */
1111 targetm
.asm_out
.file_end ();
1114 /* Parse a -d... command line switch. */
1117 decode_d_option (const char *arg
)
1128 flag_print_asm_name
= 1;
1131 flag_dump_rtl_in_asm
= 1;
1132 flag_print_asm_name
= 1;
1135 graph_dump_format
= vcg
;
1138 rtl_dump_and_exit
= 1;
1143 case 'D': /* These are handled by the preprocessor. */
1150 setup_core_dumping();
1153 enable_rtl_dump_file ();
1157 warning (0, "unrecognized gcc debugging option: %c", c
);
1162 /* Indexed by enum debug_info_type. */
1163 const char *const debug_type_names
[] =
1165 "none", "stabs", "coff", "dwarf-2", "xcoff", "vms"
1168 /* Print version information to FILE.
1169 Each line begins with INDENT (for the case where FILE is the
1170 assembler output file). */
1173 print_version (FILE *file
, const char *indent
)
1175 static const char fmt1
[] =
1177 N_("%s%s%s %sversion %s (%s)\n%s\tcompiled by GNU C version %s, ")
1179 N_("%s%s%s %sversion %s (%s) compiled by CC, ")
1183 static const char fmt2
[] =
1184 N_("GMP version %s, MPFR version %s, MPC version %s\n");
1186 static const char fmt2
[] =
1187 N_("GMP version %s, MPFR version %s\n");
1189 static const char fmt3
[] =
1190 N_("%s%swarning: %s header version %s differs from library version %s.\n");
1191 static const char fmt4
[] =
1192 N_("%s%sGGC heuristics: --param ggc-min-expand=%d --param ggc-min-heapsize=%d\n");
1194 #define __VERSION__ "[?]"
1197 file
== stderr
? _(fmt1
) : fmt1
,
1198 indent
, *indent
!= 0 ? " " : "",
1199 lang_hooks
.name
, pkgversion_string
, version_string
, TARGET_NAME
,
1200 indent
, __VERSION__
);
1202 /* We need to stringify the GMP macro values. Ugh, gmp_version has
1203 two string formats, "i.j.k" and "i.j" when k is zero. As of
1204 gmp-4.3.0, GMP always uses the 3 number format. */
1205 #define GCC_GMP_STRINGIFY_VERSION3(X) #X
1206 #define GCC_GMP_STRINGIFY_VERSION2(X) GCC_GMP_STRINGIFY_VERSION3(X)
1207 #define GCC_GMP_VERSION_NUM(X,Y,Z) (((X) << 16L) | ((Y) << 8) | (Z))
1208 #define GCC_GMP_VERSION \
1209 GCC_GMP_VERSION_NUM(__GNU_MP_VERSION, __GNU_MP_VERSION_MINOR, __GNU_MP_VERSION_PATCHLEVEL)
1210 #if GCC_GMP_VERSION < GCC_GMP_VERSION_NUM(4,3,0) && __GNU_MP_VERSION_PATCHLEVEL == 0
1211 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
1212 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR)
1214 #define GCC_GMP_STRINGIFY_VERSION GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION) "." \
1215 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_MINOR) "." \
1216 GCC_GMP_STRINGIFY_VERSION2(__GNU_MP_VERSION_PATCHLEVEL)
1219 file
== stderr
? _(fmt2
) : fmt2
,
1220 GCC_GMP_STRINGIFY_VERSION
, MPFR_VERSION_STRING
1222 , MPC_VERSION_STRING
1225 if (strcmp (GCC_GMP_STRINGIFY_VERSION
, gmp_version
))
1227 file
== stderr
? _(fmt3
) : fmt3
,
1228 indent
, *indent
!= 0 ? " " : "",
1229 "GMP", GCC_GMP_STRINGIFY_VERSION
, gmp_version
);
1230 if (strcmp (MPFR_VERSION_STRING
, mpfr_get_version ()))
1232 file
== stderr
? _(fmt3
) : fmt3
,
1233 indent
, *indent
!= 0 ? " " : "",
1234 "MPFR", MPFR_VERSION_STRING
, mpfr_get_version ());
1236 if (strcmp (MPC_VERSION_STRING
, mpc_get_version ()))
1238 file
== stderr
? _(fmt3
) : fmt3
,
1239 indent
, *indent
!= 0 ? " " : "",
1240 "MPC", MPC_VERSION_STRING
, mpc_get_version ());
1243 file
== stderr
? _(fmt4
) : fmt4
,
1244 indent
, *indent
!= 0 ? " " : "",
1245 PARAM_VALUE (GGC_MIN_EXPAND
), PARAM_VALUE (GGC_MIN_HEAPSIZE
));
1247 print_plugins_versions (file
, indent
);
1250 #ifdef ASM_COMMENT_START
1252 print_to_asm_out_file (print_switch_type type
, const char * text
)
1254 bool prepend_sep
= true;
1258 case SWITCH_TYPE_LINE_END
:
1259 putc ('\n', asm_out_file
);
1262 case SWITCH_TYPE_LINE_START
:
1263 fputs (ASM_COMMENT_START
, asm_out_file
);
1264 return strlen (ASM_COMMENT_START
);
1266 case SWITCH_TYPE_DESCRIPTIVE
:
1267 if (ASM_COMMENT_START
[0] == 0)
1268 prepend_sep
= false;
1270 case SWITCH_TYPE_PASSED
:
1271 case SWITCH_TYPE_ENABLED
:
1273 fputc (' ', asm_out_file
);
1274 fputs (text
, asm_out_file
);
1275 /* No need to return the length here as
1276 print_single_switch has already done it. */
1286 print_to_stderr (print_switch_type type
, const char * text
)
1290 case SWITCH_TYPE_LINE_END
:
1291 putc ('\n', stderr
);
1294 case SWITCH_TYPE_LINE_START
:
1297 case SWITCH_TYPE_PASSED
:
1298 case SWITCH_TYPE_ENABLED
:
1299 fputc (' ', stderr
);
1302 case SWITCH_TYPE_DESCRIPTIVE
:
1303 fputs (text
, stderr
);
1304 /* No need to return the length here as
1305 print_single_switch has already done it. */
1313 /* Print an option value and return the adjusted position in the line.
1314 ??? print_fn doesn't handle errors, eg disk full; presumably other
1315 code will catch a disk full though. */
1318 print_single_switch (print_switch_fn_type print_fn
,
1320 print_switch_type type
,
1323 /* The ultrix fprintf returns 0 on success, so compute the result
1324 we want here since we need it for the following test. The +1
1325 is for the separator character that will probably be emitted. */
1326 int len
= strlen (text
) + 1;
1329 && pos
+ len
> MAX_LINE
)
1331 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
1336 pos
+= print_fn (SWITCH_TYPE_LINE_START
, NULL
);
1338 print_fn (type
, text
);
1342 /* Print active target switches using PRINT_FN.
1343 POS is the current cursor position and MAX is the size of a "line".
1344 Each line begins with INDENT and ends with TERM.
1345 Each switch is separated from the next by SEP. */
1348 print_switch_values (print_switch_fn_type print_fn
)
1354 /* Fill in the -frandom-seed option, if the user didn't pass it, so
1355 that it can be printed below. This helps reproducibility. */
1356 if (!flag_random_seed
)
1357 init_random_seed ();
1359 /* Print the options as passed. */
1360 pos
= print_single_switch (print_fn
, pos
,
1361 SWITCH_TYPE_DESCRIPTIVE
, _("options passed: "));
1363 for (p
= &save_argv
[1]; *p
!= NULL
; p
++)
1368 if (strcmp (*p
, "-o") == 0
1369 || strcmp (*p
, "-dumpbase") == 0
1370 || strcmp (*p
, "-auxbase") == 0)
1377 if (strcmp (*p
, "-quiet") == 0
1378 || strcmp (*p
, "-version") == 0)
1385 pos
= print_single_switch (print_fn
, pos
, SWITCH_TYPE_PASSED
, *p
);
1389 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
1391 /* Print the -f and -m options that have been enabled.
1392 We don't handle language specific options but printing argv
1394 pos
= print_single_switch (print_fn
, 0,
1395 SWITCH_TYPE_DESCRIPTIVE
, _("options enabled: "));
1397 for (j
= 0; j
< cl_options_count
; j
++)
1398 if ((cl_options
[j
].flags
& CL_REPORT
)
1399 && option_enabled (j
) > 0)
1400 pos
= print_single_switch (print_fn
, pos
,
1401 SWITCH_TYPE_ENABLED
, cl_options
[j
].opt_text
);
1403 print_fn (SWITCH_TYPE_LINE_END
, NULL
);
1406 /* Open assembly code output file. Do this even if -fsyntax-only is
1407 on, because then the driver will have provided the name of a
1408 temporary file or bit bucket for us. NAME is the file specified on
1409 the command line, possibly NULL. */
1411 init_asm_output (const char *name
)
1413 if (name
== NULL
&& asm_file_name
== 0)
1414 asm_out_file
= stdout
;
1417 if (asm_file_name
== 0)
1419 int len
= strlen (dump_base_name
);
1420 char *dumpname
= XNEWVEC (char, len
+ 6);
1422 memcpy (dumpname
, dump_base_name
, len
+ 1);
1423 strip_off_ending (dumpname
, len
);
1424 strcat (dumpname
, ".s");
1425 asm_file_name
= dumpname
;
1427 if (!strcmp (asm_file_name
, "-"))
1428 asm_out_file
= stdout
;
1430 asm_out_file
= fopen (asm_file_name
, "w+b");
1431 if (asm_out_file
== 0)
1432 fatal_error ("can%'t open %s for writing: %m", asm_file_name
);
1435 if (!flag_syntax_only
)
1437 targetm
.asm_out
.file_start ();
1439 if (flag_record_gcc_switches
)
1441 if (targetm
.asm_out
.record_gcc_switches
)
1443 /* Let the target know that we are about to start recording. */
1444 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
1446 /* Now record the switches. */
1447 print_switch_values (targetm
.asm_out
.record_gcc_switches
);
1448 /* Let the target know that the recording is over. */
1449 targetm
.asm_out
.record_gcc_switches (SWITCH_TYPE_DESCRIPTIVE
,
1453 inform (input_location
, "-frecord-gcc-switches is not supported by the current target");
1456 #ifdef ASM_COMMENT_START
1457 if (flag_verbose_asm
)
1459 /* Print the list of switches in effect
1460 into the assembler file as comments. */
1461 print_version (asm_out_file
, ASM_COMMENT_START
);
1462 print_switch_values (print_to_asm_out_file
);
1463 putc ('\n', asm_out_file
);
1469 /* Return true if the state of option OPTION should be stored in PCH files
1470 and checked by default_pch_valid_p. Store the option's current state
1474 option_affects_pch_p (int option
, struct cl_option_state
*state
)
1476 if ((cl_options
[option
].flags
& CL_TARGET
) == 0)
1478 if (cl_options
[option
].flag_var
== &target_flags
)
1479 if (targetm
.check_pch_target_flags
)
1481 return get_option_state (option
, state
);
1484 /* Default version of get_pch_validity.
1485 By default, every flag difference is fatal; that will be mostly right for
1486 most targets, but completely right for very few. */
1489 default_get_pch_validity (size_t *len
)
1491 struct cl_option_state state
;
1496 if (targetm
.check_pch_target_flags
)
1497 *len
+= sizeof (target_flags
);
1498 for (i
= 0; i
< cl_options_count
; i
++)
1499 if (option_affects_pch_p (i
, &state
))
1502 result
= r
= XNEWVEC (char, *len
);
1506 if (targetm
.check_pch_target_flags
)
1508 memcpy (r
, &target_flags
, sizeof (target_flags
));
1509 r
+= sizeof (target_flags
);
1512 for (i
= 0; i
< cl_options_count
; i
++)
1513 if (option_affects_pch_p (i
, &state
))
1515 memcpy (r
, state
.data
, state
.size
);
1522 /* Return a message which says that a PCH file was created with a different
1523 setting of OPTION. */
1526 pch_option_mismatch (const char *option
)
1530 asprintf (&r
, _("created and used with differing settings of '%s'"), option
);
1532 return _("out of memory");
1536 /* Default version of pch_valid_p. */
1539 default_pch_valid_p (const void *data_p
, size_t len
)
1541 struct cl_option_state state
;
1542 const char *data
= (const char *)data_p
;
1545 /* -fpic and -fpie also usually make a PCH invalid. */
1546 if (data
[0] != flag_pic
)
1547 return _("created and used with different settings of -fpic");
1548 if (data
[1] != flag_pie
)
1549 return _("created and used with different settings of -fpie");
1552 /* Check target_flags. */
1553 if (targetm
.check_pch_target_flags
)
1558 memcpy (&tf
, data
, sizeof (target_flags
));
1559 data
+= sizeof (target_flags
);
1560 len
-= sizeof (target_flags
);
1561 r
= targetm
.check_pch_target_flags (tf
);
1566 for (i
= 0; i
< cl_options_count
; i
++)
1567 if (option_affects_pch_p (i
, &state
))
1569 if (memcmp (data
, state
.data
, state
.size
) != 0)
1570 return pch_option_mismatch (cl_options
[i
].opt_text
);
1578 /* Default tree printer. Handles declarations only. */
1580 default_tree_printer (pretty_printer
*pp
, text_info
*text
, const char *spec
,
1581 int precision
, bool wide
, bool set_locus
, bool hash
)
1585 /* FUTURE: %+x should set the locus. */
1586 if (precision
!= 0 || wide
|| hash
)
1592 t
= va_arg (*text
->args_ptr
, tree
);
1593 if (TREE_CODE (t
) == IDENTIFIER_NODE
)
1595 pp_identifier (pp
, IDENTIFIER_POINTER (t
));
1601 t
= va_arg (*text
->args_ptr
, tree
);
1602 if (DECL_DEBUG_EXPR_IS_FROM (t
) && DECL_DEBUG_EXPR (t
))
1603 t
= DECL_DEBUG_EXPR (t
);
1608 t
= va_arg (*text
->args_ptr
, tree
);
1615 if (set_locus
&& text
->locus
)
1616 *text
->locus
= DECL_SOURCE_LOCATION (t
);
1620 const char *n
= DECL_NAME (t
)
1621 ? identifier_to_locale (lang_hooks
.decl_printable_name (t
, 2))
1626 dump_generic_node (pp
, t
, 0, TDF_DIAGNOSTIC
, 0);
1631 /* A helper function; used as the reallocator function for cpp's line
1634 realloc_for_line_map (void *ptr
, size_t len
)
1636 return ggc_realloc (ptr
, len
);
1639 /* Initialization of the front end environment, before command line
1640 options are parsed. Signal handlers, internationalization etc.
1641 ARGV0 is main's argv[0]. */
1643 general_init (const char *argv0
)
1647 p
= argv0
+ strlen (argv0
);
1648 while (p
!= argv0
&& !IS_DIR_SEPARATOR (p
[-1]))
1652 xmalloc_set_program_name (progname
);
1656 /* Unlock the stdio streams. */
1657 unlock_std_streams ();
1659 gcc_init_libintl ();
1661 /* Initialize the diagnostics reporting machinery, so option parsing
1662 can give warnings and errors. */
1663 diagnostic_initialize (global_dc
);
1664 /* Set a default printer. Language specific initializations will
1665 override it later. */
1666 pp_format_decoder (global_dc
->printer
) = &default_tree_printer
;
1668 /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages. */
1670 signal (SIGSEGV
, crash_signal
);
1673 signal (SIGILL
, crash_signal
);
1676 signal (SIGBUS
, crash_signal
);
1679 signal (SIGABRT
, crash_signal
);
1681 #if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
1682 signal (SIGIOT
, crash_signal
);
1685 signal (SIGFPE
, crash_signal
);
1688 /* Other host-specific signal setup. */
1689 (*host_hooks
.extra_signals
)();
1691 /* Initialize the garbage-collector, string pools and tree type hash
1695 line_table
= GGC_NEW (struct line_maps
);
1696 linemap_init (line_table
);
1697 line_table
->reallocator
= realloc_for_line_map
;
1700 /* Initialize register usage now so switches may override. */
1703 /* Register the language-independent parameters. */
1704 add_params (lang_independent_params
, LAST_PARAM
);
1706 /* This must be done after add_params but before argument processing. */
1707 init_ggc_heuristics();
1708 init_optimization_passes ();
1709 statistics_early_init ();
1712 /* Return true if the current target supports -fsection-anchors. */
1715 target_supports_section_anchors_p (void)
1717 if (targetm
.min_anchor_offset
== 0 && targetm
.max_anchor_offset
== 0)
1720 if (targetm
.asm_out
.output_anchor
== NULL
)
1726 /* Default the align_* variables to 1 if they're still unset, and
1727 set up the align_*_log variables. */
1729 init_alignments (void)
1731 if (align_loops
<= 0)
1733 if (align_loops_max_skip
> align_loops
)
1734 align_loops_max_skip
= align_loops
- 1;
1735 align_loops_log
= floor_log2 (align_loops
* 2 - 1);
1736 if (align_jumps
<= 0)
1738 if (align_jumps_max_skip
> align_jumps
)
1739 align_jumps_max_skip
= align_jumps
- 1;
1740 align_jumps_log
= floor_log2 (align_jumps
* 2 - 1);
1741 if (align_labels
<= 0)
1743 align_labels_log
= floor_log2 (align_labels
* 2 - 1);
1744 if (align_labels_max_skip
> align_labels
)
1745 align_labels_max_skip
= align_labels
- 1;
1746 if (align_functions
<= 0)
1747 align_functions
= 1;
1748 align_functions_log
= floor_log2 (align_functions
* 2 - 1);
1751 /* Process the options that have been parsed. */
1753 process_options (void)
1755 /* Just in case lang_hooks.post_options ends up calling a debug_hook.
1756 This can happen with incorrect pre-processed input. */
1757 debug_hooks
= &do_nothing_debug_hooks
;
1759 /* This replaces set_Wunused. */
1760 if (warn_unused_function
== -1)
1761 warn_unused_function
= warn_unused
;
1762 if (warn_unused_label
== -1)
1763 warn_unused_label
= warn_unused
;
1764 /* Wunused-parameter is enabled if both -Wunused -Wextra are enabled. */
1765 if (warn_unused_parameter
== -1)
1766 warn_unused_parameter
= (warn_unused
&& extra_warnings
);
1767 if (warn_unused_variable
== -1)
1768 warn_unused_variable
= warn_unused
;
1769 if (warn_unused_value
== -1)
1770 warn_unused_value
= warn_unused
;
1772 /* This replaces set_Wextra. */
1773 if (warn_uninitialized
== -1)
1774 warn_uninitialized
= extra_warnings
;
1776 /* Allow the front end to perform consistency checks and do further
1777 initialization based on the command line options. This hook also
1778 sets the original filename if appropriate (e.g. foo.i -> foo.c)
1779 so we can correctly initialize debug output. */
1780 no_backend
= lang_hooks
.post_options (&main_input_filename
);
1782 #ifdef OVERRIDE_OPTIONS
1783 /* Some machines may reject certain combinations of options. */
1787 if (flag_section_anchors
&& !target_supports_section_anchors_p ())
1789 warning (OPT_fsection_anchors
,
1790 "this target does not support %qs", "-fsection-anchors");
1791 flag_section_anchors
= 0;
1794 if (flag_short_enums
== 2)
1795 flag_short_enums
= targetm
.default_short_enums ();
1797 /* Set aux_base_name if not already set. */
1800 else if (main_input_filename
)
1802 char *name
= xstrdup (lbasename (main_input_filename
));
1804 strip_off_ending (name
, strlen (name
));
1805 aux_base_name
= name
;
1808 aux_base_name
= "gccaux";
1813 || flag_loop_interchange
1814 || flag_loop_strip_mine
1815 || flag_graphite_identity
1816 || flag_loop_parallelize_all
)
1817 sorry ("Graphite loop optimizations cannot be used");
1820 /* Unrolling all loops implies that standard loop unrolling must also
1822 if (flag_unroll_all_loops
)
1823 flag_unroll_loops
= 1;
1825 /* The loop unrolling code assumes that cse will be run after loop.
1826 web and rename-registers also help when run after loop unrolling. */
1828 if (flag_rerun_cse_after_loop
== AUTODETECT_VALUE
)
1829 flag_rerun_cse_after_loop
= flag_unroll_loops
|| flag_peel_loops
;
1830 if (flag_web
== AUTODETECT_VALUE
)
1831 flag_web
= flag_unroll_loops
|| flag_peel_loops
;
1832 if (flag_rename_registers
== AUTODETECT_VALUE
)
1833 flag_rename_registers
= flag_unroll_loops
|| flag_peel_loops
;
1835 if (flag_non_call_exceptions
)
1836 flag_asynchronous_unwind_tables
= 1;
1837 if (flag_asynchronous_unwind_tables
)
1838 flag_unwind_tables
= 1;
1840 if (flag_value_profile_transformations
)
1841 flag_profile_values
= 1;
1843 /* Warn about options that are not supported on this machine. */
1844 #ifndef INSN_SCHEDULING
1845 if (flag_schedule_insns
|| flag_schedule_insns_after_reload
)
1846 warning (0, "instruction scheduling not supported on this target machine");
1849 if (flag_delayed_branch
)
1850 warning (0, "this target machine does not have delayed branches");
1853 user_label_prefix
= USER_LABEL_PREFIX
;
1854 if (flag_leading_underscore
!= -1)
1856 /* If the default prefix is more complicated than "" or "_",
1857 issue a warning and ignore this option. */
1858 if (user_label_prefix
[0] == 0 ||
1859 (user_label_prefix
[0] == '_' && user_label_prefix
[1] == 0))
1861 user_label_prefix
= flag_leading_underscore
? "_" : "";
1864 warning (0, "-f%sleading-underscore not supported on this target machine",
1865 flag_leading_underscore
? "" : "no-");
1868 /* If we are in verbose mode, write out the version and maybe all the
1869 option flags in use. */
1872 print_version (stderr
, "");
1874 print_switch_values (print_to_stderr
);
1877 if (flag_syntax_only
)
1879 write_symbols
= NO_DEBUG
;
1885 if (debug_info_level
== DINFO_LEVEL_NONE
)
1887 debug_info_level
= DINFO_LEVEL_NORMAL
;
1889 if (write_symbols
== NO_DEBUG
)
1890 write_symbols
= PREFERRED_DEBUGGING_TYPE
;
1893 debug_info_level
= DINFO_LEVEL_NONE
;
1896 if (flag_dump_final_insns
&& !flag_syntax_only
&& !no_backend
)
1898 FILE *final_output
= fopen (flag_dump_final_insns
, "w");
1901 error ("could not open final insn dump file %qs: %s",
1902 flag_dump_final_insns
, strerror (errno
));
1903 flag_dump_final_insns
= NULL
;
1905 else if (fclose (final_output
))
1907 error ("could not close zeroed insn dump file %qs: %s",
1908 flag_dump_final_insns
, strerror (errno
));
1909 flag_dump_final_insns
= NULL
;
1913 /* A lot of code assumes write_symbols == NO_DEBUG if the debugging
1915 if (debug_info_level
== DINFO_LEVEL_NONE
)
1916 write_symbols
= NO_DEBUG
;
1918 /* Now we know write_symbols, set up the debug hooks based on it.
1919 By default we do nothing for debug output. */
1920 if (PREFERRED_DEBUGGING_TYPE
== NO_DEBUG
)
1921 default_debug_hooks
= &do_nothing_debug_hooks
;
1922 #if defined(DBX_DEBUGGING_INFO)
1923 else if (PREFERRED_DEBUGGING_TYPE
== DBX_DEBUG
)
1924 default_debug_hooks
= &dbx_debug_hooks
;
1926 #if defined(XCOFF_DEBUGGING_INFO)
1927 else if (PREFERRED_DEBUGGING_TYPE
== XCOFF_DEBUG
)
1928 default_debug_hooks
= &xcoff_debug_hooks
;
1930 #ifdef SDB_DEBUGGING_INFO
1931 else if (PREFERRED_DEBUGGING_TYPE
== SDB_DEBUG
)
1932 default_debug_hooks
= &sdb_debug_hooks
;
1934 #ifdef DWARF2_DEBUGGING_INFO
1935 else if (PREFERRED_DEBUGGING_TYPE
== DWARF2_DEBUG
)
1936 default_debug_hooks
= &dwarf2_debug_hooks
;
1938 #ifdef VMS_DEBUGGING_INFO
1939 else if (PREFERRED_DEBUGGING_TYPE
== VMS_DEBUG
1940 || PREFERRED_DEBUGGING_TYPE
== VMS_AND_DWARF2_DEBUG
)
1941 default_debug_hooks
= &vmsdbg_debug_hooks
;
1944 if (write_symbols
== NO_DEBUG
)
1946 #if defined(DBX_DEBUGGING_INFO)
1947 else if (write_symbols
== DBX_DEBUG
)
1948 debug_hooks
= &dbx_debug_hooks
;
1950 #if defined(XCOFF_DEBUGGING_INFO)
1951 else if (write_symbols
== XCOFF_DEBUG
)
1952 debug_hooks
= &xcoff_debug_hooks
;
1954 #ifdef SDB_DEBUGGING_INFO
1955 else if (write_symbols
== SDB_DEBUG
)
1956 debug_hooks
= &sdb_debug_hooks
;
1958 #ifdef DWARF2_DEBUGGING_INFO
1959 else if (write_symbols
== DWARF2_DEBUG
)
1960 debug_hooks
= &dwarf2_debug_hooks
;
1962 #ifdef VMS_DEBUGGING_INFO
1963 else if (write_symbols
== VMS_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
1964 debug_hooks
= &vmsdbg_debug_hooks
;
1967 error ("target system does not support the \"%s\" debug format",
1968 debug_type_names
[write_symbols
]);
1970 /* Now we know which debug output will be used so we can set
1971 flag_var_tracking, flag_rename_registers if the user has
1972 not specified them. */
1973 if (debug_info_level
< DINFO_LEVEL_NORMAL
1974 || debug_hooks
->var_location
== do_nothing_debug_hooks
.var_location
)
1976 if (flag_var_tracking
== 1
1977 || flag_var_tracking_uninit
== 1)
1979 if (debug_info_level
< DINFO_LEVEL_NORMAL
)
1980 warning (0, "variable tracking requested, but useless unless "
1981 "producing debug info");
1983 warning (0, "variable tracking requested, but not supported "
1984 "by this debug format");
1986 flag_var_tracking
= 0;
1987 flag_var_tracking_uninit
= 0;
1990 /* If the user specifically requested variable tracking with tagging
1991 uninitialized variables, we need to turn on variable tracking.
1992 (We already determined above that variable tracking is feasible.) */
1993 if (flag_var_tracking_uninit
)
1994 flag_var_tracking
= 1;
1996 if (flag_var_tracking
== AUTODETECT_VALUE
)
1997 flag_var_tracking
= optimize
>= 1;
1999 if (flag_var_tracking_assignments
== AUTODETECT_VALUE
)
2000 flag_var_tracking_assignments
= flag_var_tracking
2001 && !(flag_selective_scheduling
|| flag_selective_scheduling2
);
2003 if (flag_var_tracking_assignments_toggle
)
2004 flag_var_tracking_assignments
= !flag_var_tracking_assignments
;
2006 if (flag_var_tracking_assignments
&& !flag_var_tracking
)
2007 flag_var_tracking
= flag_var_tracking_assignments
= -1;
2009 if (flag_var_tracking_assignments
2010 && (flag_selective_scheduling
|| flag_selective_scheduling2
))
2011 warning (0, "var-tracking-assignments changes selective scheduling");
2013 if (flag_rename_registers
== AUTODETECT_VALUE
)
2014 flag_rename_registers
= default_debug_hooks
->var_location
2015 != do_nothing_debug_hooks
.var_location
;
2017 if (flag_tree_cselim
== AUTODETECT_VALUE
)
2018 #ifdef HAVE_conditional_move
2019 flag_tree_cselim
= 1;
2021 flag_tree_cselim
= 0;
2024 /* If auxiliary info generation is desired, open the output file.
2025 This goes in the same directory as the source file--unlike
2026 all the other output files. */
2027 if (flag_gen_aux_info
)
2029 aux_info_file
= fopen (aux_info_file_name
, "w");
2030 if (aux_info_file
== 0)
2031 fatal_error ("can%'t open %s: %m", aux_info_file_name
);
2034 if (! targetm
.have_named_sections
)
2036 if (flag_function_sections
)
2038 warning (0, "-ffunction-sections not supported for this target");
2039 flag_function_sections
= 0;
2041 if (flag_data_sections
)
2043 warning (0, "-fdata-sections not supported for this target");
2044 flag_data_sections
= 0;
2048 if (flag_function_sections
&& profile_flag
)
2050 warning (0, "-ffunction-sections disabled; it makes profiling impossible");
2051 flag_function_sections
= 0;
2054 #ifndef HAVE_prefetch
2055 if (flag_prefetch_loop_arrays
)
2057 warning (0, "-fprefetch-loop-arrays not supported for this target");
2058 flag_prefetch_loop_arrays
= 0;
2061 if (flag_prefetch_loop_arrays
&& !HAVE_prefetch
)
2063 warning (0, "-fprefetch-loop-arrays not supported for this target (try -march switches)");
2064 flag_prefetch_loop_arrays
= 0;
2068 /* This combination of options isn't handled for i386 targets and doesn't
2069 make much sense anyway, so don't allow it. */
2070 if (flag_prefetch_loop_arrays
&& optimize_size
)
2072 warning (0, "-fprefetch-loop-arrays is not supported with -Os");
2073 flag_prefetch_loop_arrays
= 0;
2076 /* The presence of IEEE signaling NaNs, implies all math can trap. */
2077 if (flag_signaling_nans
)
2078 flag_trapping_math
= 1;
2080 /* We cannot reassociate if we want traps or signed zeros. */
2081 if (flag_associative_math
&& (flag_trapping_math
|| flag_signed_zeros
))
2083 warning (0, "-fassociative-math disabled; other options take precedence");
2084 flag_associative_math
= 0;
2087 /* With -fcx-limited-range, we do cheap and quick complex arithmetic. */
2088 if (flag_cx_limited_range
)
2089 flag_complex_method
= 0;
2091 /* With -fcx-fortran-rules, we do something in-between cheap and C99. */
2092 if (flag_cx_fortran_rules
)
2093 flag_complex_method
= 1;
2095 /* Targets must be able to place spill slots at lower addresses. If the
2096 target already uses a soft frame pointer, the transition is trivial. */
2097 if (!FRAME_GROWS_DOWNWARD
&& flag_stack_protect
)
2099 warning (0, "-fstack-protector not supported for this target");
2100 flag_stack_protect
= 0;
2102 if (!flag_stack_protect
)
2103 warn_stack_protect
= 0;
2105 /* ??? Unwind info is not correct around the CFG unless either a frame
2106 pointer is present or A_O_A is set. Fixing this requires rewriting
2107 unwind info generation to be aware of the CFG and propagating states
2109 if (flag_unwind_tables
&& !ACCUMULATE_OUTGOING_ARGS
2110 && flag_omit_frame_pointer
)
2112 warning (0, "unwind tables currently require a frame pointer "
2114 flag_omit_frame_pointer
= 0;
2118 /* This function can be called multiple times to reinitialize the compiler
2119 back end when register classes or instruction sets have changed,
2120 before each function. */
2122 backend_init_target (void)
2124 /* Initialize alignment variables. */
2127 /* This reinitializes hard_frame_pointer, and calls init_reg_modes_target()
2128 to initialize reg_raw_mode[]. */
2131 /* This invokes target hooks to set fixed_reg[] etc, which is
2135 /* This depends on stack_pointer_rtx. */
2136 init_fake_stack_mems ();
2138 /* Sets static_base_value[HARD_FRAME_POINTER_REGNUM], which is
2140 init_alias_target ();
2142 /* Depends on HARD_FRAME_POINTER_REGNUM. */
2145 /* The following initialization functions need to generate rtl, so
2146 provide a dummy function context for them. */
2147 init_dummy_function_start ();
2149 /* rtx_cost is mode-dependent, so cached values need to be recomputed
2150 on a mode change. */
2153 /* We may need to recompute regno_save_code[] and regno_restore_code[]
2154 after a mode change as well. */
2155 if (flag_caller_saves
)
2156 init_caller_save ();
2157 expand_dummy_function_end ();
2160 /* Initialize the compiler back end. This function is called only once,
2161 when starting the compiler. */
2165 init_emit_once (debug_info_level
== DINFO_LEVEL_NORMAL
2166 || debug_info_level
== DINFO_LEVEL_VERBOSE
2167 #ifdef VMS_DEBUGGING_INFO
2168 /* Enable line number info for traceback. */
2169 || debug_info_level
> DINFO_LEVEL_NONE
2171 || flag_test_coverage
);
2174 init_inline_once ();
2175 init_varasm_once ();
2176 save_register_info ();
2178 /* Initialize the target-specific back end pieces. */
2180 backend_init_target ();
2183 /* Initialize excess precision settings. */
2185 init_excess_precision (void)
2187 /* Adjust excess precision handling based on the target options. If
2188 the front end cannot handle it, flag_excess_precision_cmdline
2189 will already have been set accordingly in the post_options
2191 gcc_assert (flag_excess_precision_cmdline
!= EXCESS_PRECISION_DEFAULT
);
2192 flag_excess_precision
= flag_excess_precision_cmdline
;
2193 if (flag_unsafe_math_optimizations
)
2194 flag_excess_precision
= EXCESS_PRECISION_FAST
;
2195 if (flag_excess_precision
== EXCESS_PRECISION_STANDARD
)
2197 int flt_eval_method
= TARGET_FLT_EVAL_METHOD
;
2198 switch (flt_eval_method
)
2202 /* Either the target acts unpredictably (-1) or has all the
2203 operations required not to have excess precision (0). */
2204 flag_excess_precision
= EXCESS_PRECISION_FAST
;
2208 /* In these cases, predictable excess precision makes
2212 /* Any other implementation-defined FLT_EVAL_METHOD values
2213 require the compiler to handle the associated excess
2214 precision rules in excess_precision_type. */
2220 /* Initialize things that are both lang-dependent and target-dependent.
2221 This function can be called more than once if target parameters change. */
2223 lang_dependent_init_target (void)
2225 /* This determines excess precision settings. */
2226 init_excess_precision ();
2228 /* This creates various _DECL nodes, so needs to be called after the
2229 front end is initialized. It also depends on the HAVE_xxx macros
2230 generated from the target machine description. */
2233 /* The following initialization functions need to generate rtl, so
2234 provide a dummy function context for them. */
2235 init_dummy_function_start ();
2237 /* Do the target-specific parts of expr initialization. */
2238 init_expr_target ();
2240 /* Although the actions of these functions are language-independent,
2241 they use optabs, so we cannot call them from backend_init. */
2245 expand_dummy_function_end ();
2248 /* Language-dependent initialization. Returns nonzero on success. */
2250 lang_dependent_init (const char *name
)
2252 location_t save_loc
= input_location
;
2253 if (dump_base_name
== 0)
2254 dump_base_name
= name
&& name
[0] ? name
: "gccdump";
2256 /* Other front-end initialization. */
2257 input_location
= BUILTINS_LOCATION
;
2258 if (lang_hooks
.init () == 0)
2260 input_location
= save_loc
;
2262 init_asm_output (name
);
2264 /* This creates various _DECL nodes, so needs to be called after the
2265 front end is initialized. */
2268 /* Do the target-specific parts of the initialization. */
2269 lang_dependent_init_target ();
2271 /* If dbx symbol table desired, initialize writing it and output the
2272 predefined types. */
2273 timevar_push (TV_SYMOUT
);
2275 #if defined DWARF2_DEBUGGING_INFO || defined DWARF2_UNWIND_INFO
2276 if (dwarf2out_do_frame ())
2277 dwarf2out_frame_init ();
2280 /* Now we have the correct original filename, we can initialize
2282 (*debug_hooks
->init
) (name
);
2284 timevar_pop (TV_SYMOUT
);
2290 /* Reinitialize everything when target parameters, such as register usage,
2293 target_reinit (void)
2295 /* Reinitialize RTL backend. */
2296 backend_init_target ();
2298 /* Reinitialize lang-dependent parts. */
2299 lang_dependent_init_target ();
2303 dump_memory_report (bool final
)
2305 ggc_print_statistics ();
2306 stringpool_statistics ();
2307 dump_tree_statistics ();
2308 dump_gimple_statistics ();
2309 dump_rtx_statistics ();
2310 dump_varray_statistics ();
2311 dump_alloc_pool_statistics ();
2312 dump_bitmap_statistics ();
2313 dump_vec_loc_statistics ();
2314 dump_ggc_loc_statistics (final
);
2315 dump_alias_stats (stderr
);
2316 dump_pta_stats (stderr
);
2319 /* Clean up: close opened files, etc. */
2324 /* Close the dump files. */
2325 if (flag_gen_aux_info
)
2327 fclose (aux_info_file
);
2329 unlink (aux_info_file_name
);
2332 /* Close non-debugging input and output files. Take special care to note
2333 whether fclose returns an error, since the pages might still be on the
2334 buffer chain while the file is open. */
2338 if (ferror (asm_out_file
) != 0)
2339 fatal_error ("error writing to %s: %m", asm_file_name
);
2340 if (fclose (asm_out_file
) != 0)
2341 fatal_error ("error closing %s: %m", asm_file_name
);
2345 finish_optimization_passes ();
2350 dump_memory_report (true);
2352 /* Language-specific end of compilation actions. */
2353 lang_hooks
.finish ();
2356 /* Initialize the compiler, and compile the input file. */
2360 /* Initialize timing first. The C front ends read the main file in
2361 the post_options hook, and C++ does file timings. */
2362 if (time_report
|| !quiet_flag
|| flag_detailed_statistics
)
2364 timevar_start (TV_TOTAL
);
2368 /* Don't do any more if an error has already occurred. */
2371 /* This must be run always, because it is needed to compute the FP
2372 predefined macros, such as __LDBL_MAX__, for targets using non
2373 default FP formats. */
2374 init_adjust_machine_modes ();
2376 /* Set up the back-end if requested. */
2380 /* Language-dependent initialization. Returns true on success. */
2381 if (lang_dependent_init (main_input_filename
))
2387 /* Stop timing and print the times. */
2388 timevar_stop (TV_TOTAL
);
2389 timevar_print (stderr
);
2392 /* Entry point of cc1, cc1plus, jc1, f771, etc.
2393 Exit code is FATAL_EXIT_CODE if can't open files or if there were
2394 any errors, or SUCCESS_EXIT_CODE if compilation succeeded.
2396 It is not safe to call this function more than once. */
2399 toplev_main (int argc
, char **argv
)
2401 expandargv (&argc
, &argv
);
2403 save_argv
= CONST_CAST2 (const char **, char **, argv
);
2405 /* Initialization of GCC's environment, and diagnostics. */
2406 general_init (argv
[0]);
2408 /* Parse the options and do minimal processing; basically just
2409 enough to default flags appropriately. */
2410 decode_options (argc
, CONST_CAST2 (const char **, char **, argv
));
2414 initialize_plugins ();
2417 print_version (stderr
, "");
2420 print_plugins_help (stderr
, "");
2422 /* Exit early if we can (e.g. -help). */
2423 if (!exit_after_options
)
2426 if (warningcount
|| errorcount
)
2427 print_ignored_options ();
2429 /* Invoke registered plugin callbacks if any. */
2430 invoke_plugin_callbacks (PLUGIN_FINISH
, NULL
);
2432 finalize_plugins ();
2433 if (errorcount
|| sorrycount
)
2434 return (FATAL_EXIT_CODE
);
2436 return (SUCCESS_EXIT_CODE
);